--- /dev/null
+config DGRP
+ tristate "Digi Realport driver"
+ default n
+ depends on SYSFS
+ ---help---
+ Support for Digi Realport devices. These devices allow you to
+ access remote serial ports as if they are local tty devices. This
+ will build the kernel driver, you will still need the userspace
+ component to make your Realport device work.
--- /dev/null
+obj-$(CONFIG_DGRP) += dgrp.o
+
+dgrp-y := \
+ dgrp_common.o \
+ dgrp_dpa_ops.o \
+ dgrp_driver.o \
+ dgrp_mon_ops.o \
+ dgrp_net_ops.o \
+ dgrp_ports_ops.o \
+ dgrp_specproc.o \
+ dgrp_tty.o \
+ dgrp_sysfs.o
--- /dev/null
+The user space code to work with this driver is located at
+https://github.com/wfp5p/dgrp-utils
--- /dev/null
+- Use configfs for config stuff. This will require changes to the
+ user space code.
+
+- Check the calls to tty_register_device. In particular, check to see
+ if there should be some handling for IS_ERR(classp).
+
+- dgrp_send() and dgrp_receive() could use some refactoring
--- /dev/null
+/*
+ *
+ * Copyright 1999 Digi International (www.digi.com)
+ * James Puzzo <jamesp at digi dot com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ */
+
+/*
+ *
+ * Filename:
+ *
+ * dgrp_common.c
+ *
+ * Description:
+ *
+ * Definitions of global variables and functions which are either
+ * shared by the tty, mon, and net drivers; or which cross them
+ * functionally (like the poller).
+ *
+ * Author:
+ *
+ * James A. Puzzo
+ *
+ */
+
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/sched.h>
+#include <linux/cred.h>
+
+#include "dgrp_common.h"
+
+/**
+ * dgrp_carrier -- check for carrier change state and act
+ * @ch: struct ch_struct *
+ */
+void dgrp_carrier(struct ch_struct *ch)
+{
+ struct nd_struct *nd;
+
+ int virt_carrier = 0;
+ int phys_carrier = 0;
+
+ /* fix case when the tty has already closed. */
+
+ if (!ch)
+ return;
+ nd = ch->ch_nd;
+ if (!nd)
+ return;
+
+ /*
+ * If we are currently waiting to determine the status of the port,
+ * we don't yet know the state of the modem lines. As a result,
+ * we ignore state changes when we are waiting for the modem lines
+ * to be established. We know, as a result of code in dgrp_net_ops,
+ * that we will be called again immediately following the reception
+ * of the status message with the true modem status flags in it.
+ */
+ if (ch->ch_expect & RR_STATUS)
+ return;
+
+ /*
+ * If CH_HANGUP is set, we gotta keep trying to get all the processes
+ * that have the port open to close the port.
+ * So lets just keep sending a hangup every time we get here.
+ */
+ if ((ch->ch_flag & CH_HANGUP) &&
+ (ch->ch_tun.un_open_count > 0))
+ tty_hangup(ch->ch_tun.un_tty);
+
+ /*
+ * Compute the effective state of both the physical and virtual
+ * senses of carrier.
+ */
+
+ if (ch->ch_s_mlast & DM_CD)
+ phys_carrier = 1;
+
+ if ((ch->ch_s_mlast & DM_CD) ||
+ (ch->ch_digi.digi_flags & DIGI_FORCEDCD) ||
+ (ch->ch_flag & CH_CLOCAL))
+ virt_carrier = 1;
+
+ /*
+ * Test for a VIRTUAL carrier transition to HIGH.
+ *
+ * The CH_HANGUP condition is intended to prevent any action
+ * except for close. As a result, we ignore positive carrier
+ * transitions during CH_HANGUP.
+ */
+ if (((ch->ch_flag & CH_HANGUP) == 0) &&
+ ((ch->ch_flag & CH_VIRT_CD) == 0) &&
+ (virt_carrier == 1)) {
+ /*
+ * When carrier rises, wake any threads waiting
+ * for carrier in the open routine.
+ */
+ nd->nd_tx_work = 1;
+
+ if (waitqueue_active(&ch->ch_flag_wait))
+ wake_up_interruptible(&ch->ch_flag_wait);
+ }
+
+ /*
+ * Test for a PHYSICAL transition to low, so long as we aren't
+ * currently ignoring physical transitions (which is what "virtual
+ * carrier" indicates).
+ *
+ * The transition of the virtual carrier to low really doesn't
+ * matter... it really only means "ignore carrier state", not
+ * "make pretend that carrier is there".
+ */
+ if ((virt_carrier == 0) &&
+ ((ch->ch_flag & CH_PHYS_CD) != 0) &&
+ (phys_carrier == 0)) {
+ /*
+ * When carrier drops:
+ *
+ * Do a Hard Hangup if that is called for.
+ *
+ * Drop carrier on all open units.
+ *
+ * Flush queues, waking up any task waiting in the
+ * line discipline.
+ *
+ * Send a hangup to the control terminal.
+ *
+ * Enable all select calls.
+ */
+
+ nd->nd_tx_work = 1;
+
+ ch->ch_flag &= ~(CH_LOW | CH_EMPTY | CH_DRAIN | CH_INPUT);
+
+ if (waitqueue_active(&ch->ch_flag_wait))
+ wake_up_interruptible(&ch->ch_flag_wait);
+
+ if (ch->ch_tun.un_open_count > 0)
+ tty_hangup(ch->ch_tun.un_tty);
+
+ if (ch->ch_pun.un_open_count > 0)
+ tty_hangup(ch->ch_pun.un_tty);
+ }
+
+ /*
+ * Make sure that our cached values reflect the current reality.
+ */
+ if (virt_carrier == 1)
+ ch->ch_flag |= CH_VIRT_CD;
+ else
+ ch->ch_flag &= ~CH_VIRT_CD;
+
+ if (phys_carrier == 1)
+ ch->ch_flag |= CH_PHYS_CD;
+ else
+ ch->ch_flag &= ~CH_PHYS_CD;
+
+}
+
+/**
+ * dgrp_chk_perm() -- check permissions for net device
+ * @inode: pointer to inode structure for the net communication device
+ * @op: operation to be tested
+ *
+ * The file permissions and ownerships are tested to determine whether
+ * the operation "op" is permitted on the file pointed to by the inode.
+ * Returns 0 if the operation is permitted, -EACCESS otherwise
+ */
+int dgrp_chk_perm(int mode, int op)
+{
+ if (!current_euid())
+ mode >>= 6;
+ else if (in_egroup_p(0))
+ mode >>= 3;
+
+ if ((mode & op & 0007) == op)
+ return 0;
+
+ if (capable(CAP_SYS_ADMIN))
+ return 0;
+
+ return -EACCES;
+}
+
+/* dgrp_chk_perm wrapper for permission call in struct inode_operations */
+int dgrp_inode_permission(struct inode *inode, int op)
+{
+ return dgrp_chk_perm(inode->i_mode, op);
+}
--- /dev/null
+/*
+ *
+ * Copyright 1999 Digi International (www.digi.com)
+ * James Puzzo <jamesp at digi dot com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ */
+
+#ifndef __DGRP_COMMON_H
+#define __DGRP_COMMON_H
+
+#define DIGI_VERSION "1.9-29"
+
+#include <linux/fs.h>
+#include <linux/timer.h>
+#include "drp.h"
+
+#define DGRP_TTIME 100
+#define DGRP_RTIME 100
+
+/************************************************************************
+ * All global storage allocation.
+ ************************************************************************/
+
+extern int dgrp_rawreadok; /* Allow raw writing of input */
+extern int dgrp_register_cudevices; /* enable legacy cu devices */
+extern int dgrp_register_prdevices; /* enable transparent print devices */
+extern int dgrp_poll_tick; /* Poll interval - in ms */
+
+extern struct list_head nd_struct_list;
+
+struct dgrp_poll_data {
+ spinlock_t poll_lock;
+ struct timer_list timer;
+ int poll_tick;
+ ulong poll_round; /* Timer rouding factor */
+ long node_active_count;
+};
+
+extern struct dgrp_poll_data dgrp_poll_data;
+extern void dgrp_poll_handler(unsigned long arg);
+
+/* from dgrp_mon_ops.c */
+extern void dgrp_register_mon_hook(struct proc_dir_entry *de);
+
+/* from dgrp_tty.c */
+extern int dgrp_tty_init(struct nd_struct *nd);
+extern void dgrp_tty_uninit(struct nd_struct *nd);
+
+/* from dgrp_ports_ops.c */
+extern void dgrp_register_ports_hook(struct proc_dir_entry *de);
+
+/* from dgrp_net_ops.c */
+extern void dgrp_register_net_hook(struct proc_dir_entry *de);
+
+/* from dgrp_dpa_ops.c */
+extern void dgrp_register_dpa_hook(struct proc_dir_entry *de);
+extern void dgrp_dpa_data(struct nd_struct *, int, u8 *, int);
+
+/* from dgrp_sysfs.c */
+extern void dgrp_create_class_sysfs_files(void);
+extern void dgrp_remove_class_sysfs_files(void);
+
+extern void dgrp_create_node_class_sysfs_files(struct nd_struct *nd);
+extern void dgrp_remove_node_class_sysfs_files(struct nd_struct *nd);
+
+extern void dgrp_create_tty_sysfs(struct un_struct *un, struct device *c);
+extern void dgrp_remove_tty_sysfs(struct device *c);
+
+/* from dgrp_specproc.c */
+/*
+ * The list of DGRP entries with r/w capabilities. These
+ * magic numbers are used for identification purposes.
+ */
+enum {
+ DGRP_CONFIG = 1, /* Configure portservers */
+ DGRP_NETDIR = 2, /* Directory for "net" devices */
+ DGRP_MONDIR = 3, /* Directory for "mon" devices */
+ DGRP_PORTSDIR = 4, /* Directory for "ports" devices */
+ DGRP_INFO = 5, /* Get info. about the running module */
+ DGRP_NODEINFO = 6, /* Get info. about the configured nodes */
+ DGRP_DPADIR = 7, /* Directory for the "dpa" devices */
+};
+
+/*
+ * Directions for proc handlers
+ */
+enum {
+ INBOUND = 1, /* Data being written to kernel */
+ OUTBOUND = 2, /* Data being read from the kernel */
+};
+
+/**
+ * dgrp_proc_entry: structure for dgrp proc dirs
+ * @id: ID number associated with this particular entry. Should be
+ * unique across all of DGRP.
+ * @name: text name associated with the /proc entry
+ * @mode: file access permisssions for the /proc entry
+ * @child: pointer to table describing a subdirectory for this entry
+ * @de: pointer to directory entry for this object once registered. Used
+ * to grab the handle of the object for unregistration
+ * @excl_sem: semaphore to provide exclusive to struct
+ * @excl_cnt: counter of current accesses
+ *
+ * Each entry in a DGRP proc directory is described with a
+ * dgrp_proc_entry structure. A collection of these
+ * entries (in an array) represents the members associated
+ * with a particular /proc directory, and is referred to
+ * as a table. All tables are terminated by an entry with
+ * zeros for every member.
+ */
+struct dgrp_proc_entry {
+ int id; /* Integer identifier */
+ const char *name; /* ASCII identifier */
+ mode_t mode; /* File access permissions */
+ struct dgrp_proc_entry *child; /* Child pointer */
+
+ /* file ops to use, pass NULL to use default */
+ struct file_operations *proc_file_ops;
+
+ struct proc_dir_entry *de; /* proc entry pointer */
+ struct semaphore excl_sem; /* Protects exclusive access var */
+ int excl_cnt; /* Counts number of curr accesses */
+};
+
+extern void dgrp_unregister_proc(void);
+extern void dgrp_register_proc(void);
+
+/*-----------------------------------------------------------------------*
+ *
+ * Declarations for common operations:
+ *
+ * (either used by more than one of net, mon, or tty,
+ * or in interrupt context (i.e. the poller))
+ *
+ *-----------------------------------------------------------------------*/
+
+void dgrp_carrier(struct ch_struct *ch);
+extern int dgrp_inode_permission(struct inode *inode, int op);
+extern int dgrp_chk_perm(int mode, int op);
+
+
+/*
+ * ID manipulation macros (where c1 & c2 are characters, i is
+ * a long integer, and s is a character array of at least three members
+ */
+
+static inline void ID_TO_CHAR(long i, char *s)
+{
+ s[0] = ((i & 0xff00)>>8);
+ s[1] = (i & 0xff);
+ s[2] = 0;
+}
+
+static inline long CHAR_TO_ID(char *s)
+{
+ return ((s[0] & 0xff) << 8) | (s[1] & 0xff);
+}
+
+static inline struct nd_struct *nd_struct_get(long major)
+{
+ struct nd_struct *nd;
+
+ list_for_each_entry(nd, &nd_struct_list, list) {
+ if (major == nd->nd_major)
+ return nd;
+ }
+
+ return NULL;
+}
+
+static inline int nd_struct_add(struct nd_struct *entry)
+{
+ struct nd_struct *ptr;
+
+ ptr = nd_struct_get(entry->nd_major);
+
+ if (ptr)
+ return -EBUSY;
+
+ list_add_tail(&entry->list, &nd_struct_list);
+
+ return 0;
+}
+
+static inline int nd_struct_del(struct nd_struct *entry)
+{
+ struct nd_struct *nd;
+
+ nd = nd_struct_get(entry->nd_major);
+
+ if (!nd)
+ return -ENODEV;
+
+ list_del(&nd->list);
+ return 0;
+}
+
+#endif /* __DGRP_COMMON_H */
--- /dev/null
+/*
+ *
+ * Copyright 1999 Digi International (www.digi.com)
+ * James Puzzo <jamesp at digi dot com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ */
+
+/*
+ *
+ * Filename:
+ *
+ * dgrp_dpa_ops.c
+ *
+ * Description:
+ *
+ * Handle the file operations required for the "dpa" devices.
+ * Includes those functions required to register the "dpa" devices
+ * in "/proc".
+ *
+ * Author:
+ *
+ * James A. Puzzo
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/tty.h>
+#include <linux/poll.h>
+#include <linux/cred.h>
+#include <linux/sched.h>
+#include <linux/ratelimit.h>
+#include <asm/unaligned.h>
+
+#include "dgrp_common.h"
+
+/* File operation declarations */
+static int dgrp_dpa_open(struct inode *, struct file *);
+static int dgrp_dpa_release(struct inode *, struct file *);
+static ssize_t dgrp_dpa_read(struct file *, char __user *, size_t, loff_t *);
+static long dgrp_dpa_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg);
+static unsigned int dgrp_dpa_select(struct file *, struct poll_table_struct *);
+
+static const struct file_operations dpa_ops = {
+ .owner = THIS_MODULE,
+ .read = dgrp_dpa_read,
+ .poll = dgrp_dpa_select,
+ .unlocked_ioctl = dgrp_dpa_ioctl,
+ .open = dgrp_dpa_open,
+ .release = dgrp_dpa_release,
+};
+
+static struct inode_operations dpa_inode_ops = {
+ .permission = dgrp_inode_permission
+};
+
+
+
+struct digi_node {
+ uint nd_state; /* Node state: 1 = up, 0 = down. */
+ uint nd_chan_count; /* Number of channels found */
+ uint nd_tx_byte; /* Tx data count */
+ uint nd_rx_byte; /* RX data count */
+ u8 nd_ps_desc[MAX_DESC_LEN]; /* Description from PS */
+};
+
+#define DIGI_GETNODE (('d'<<8) | 249) /* get board info */
+
+
+struct digi_chan {
+ uint ch_port; /* Port number to get info on */
+ uint ch_open; /* 1 if open, 0 if not */
+ uint ch_txcount; /* TX data count */
+ uint ch_rxcount; /* RX data count */
+ uint ch_s_brate; /* Realport BRATE */
+ uint ch_s_estat; /* Realport ELAST */
+ uint ch_s_cflag; /* Realport CFLAG */
+ uint ch_s_iflag; /* Realport IFLAG */
+ uint ch_s_oflag; /* Realport OFLAG */
+ uint ch_s_xflag; /* Realport XFLAG */
+ uint ch_s_mstat; /* Realport MLAST */
+};
+
+#define DIGI_GETCHAN (('d'<<8) | 248) /* get channel info */
+
+
+struct digi_vpd {
+ int vpd_len;
+ char vpd_data[VPDSIZE];
+};
+
+#define DIGI_GETVPD (('d'<<8) | 246) /* get VPD info */
+
+
+struct digi_debug {
+ int onoff;
+ int port;
+};
+
+#define DIGI_SETDEBUG (('d'<<8) | 247) /* set debug info */
+
+
+void dgrp_register_dpa_hook(struct proc_dir_entry *de)
+{
+ struct nd_struct *node = de->data;
+
+ de->proc_iops = &dpa_inode_ops;
+ de->proc_fops = &dpa_ops;
+
+ node->nd_dpa_de = de;
+ spin_lock_init(&node->nd_dpa_lock);
+}
+
+/*
+ * dgrp_dpa_open -- open the DPA device for a particular PortServer
+ */
+static int dgrp_dpa_open(struct inode *inode, struct file *file)
+{
+ struct nd_struct *nd;
+ int rtn = 0;
+
+ struct proc_dir_entry *de;
+
+ rtn = try_module_get(THIS_MODULE);
+ if (!rtn)
+ return -ENXIO;
+
+ rtn = 0;
+
+ if (!capable(CAP_SYS_ADMIN)) {
+ rtn = -EPERM;
+ goto done;
+ }
+
+ /*
+ * Make sure that the "private_data" field hasn't already been used.
+ */
+ if (file->private_data) {
+ rtn = -EINVAL;
+ goto done;
+ }
+
+ /*
+ * Get the node pointer, and fail if it doesn't exist.
+ */
+ de = PDE(inode);
+ if (!de) {
+ rtn = -ENXIO;
+ goto done;
+ }
+ nd = (struct nd_struct *)de->data;
+ if (!nd) {
+ rtn = -ENXIO;
+ goto done;
+ }
+
+ file->private_data = (void *) nd;
+
+ /*
+ * Allocate the DPA buffer.
+ */
+
+ if (nd->nd_dpa_buf) {
+ rtn = -EBUSY;
+ } else {
+ nd->nd_dpa_buf = kmalloc(DPA_MAX, GFP_KERNEL);
+
+ if (!nd->nd_dpa_buf) {
+ rtn = -ENOMEM;
+ } else {
+ nd->nd_dpa_out = 0;
+ nd->nd_dpa_in = 0;
+ nd->nd_dpa_lbolt = jiffies;
+ }
+ }
+
+done:
+
+ if (rtn)
+ module_put(THIS_MODULE);
+ return rtn;
+}
+
+/*
+ * dgrp_dpa_release -- close the DPA device for a particular PortServer
+ */
+static int dgrp_dpa_release(struct inode *inode, struct file *file)
+{
+ struct nd_struct *nd;
+ u8 *buf;
+ unsigned long lock_flags;
+
+ /*
+ * Get the node pointer, and quit if it doesn't exist.
+ */
+ nd = (struct nd_struct *)(file->private_data);
+ if (!nd)
+ goto done;
+
+ /*
+ * Free the dpa buffer.
+ */
+
+ spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
+
+ buf = nd->nd_dpa_buf;
+
+ nd->nd_dpa_buf = NULL;
+ nd->nd_dpa_out = nd->nd_dpa_in;
+
+ /*
+ * Wakeup any thread waiting for buffer space.
+ */
+
+ if (nd->nd_dpa_flag & DPA_WAIT_SPACE) {
+ nd->nd_dpa_flag &= ~DPA_WAIT_SPACE;
+ wake_up_interruptible(&nd->nd_dpa_wqueue);
+ }
+
+ spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
+
+ kfree(buf);
+
+done:
+ module_put(THIS_MODULE);
+ file->private_data = NULL;
+ return 0;
+}
+
+/*
+ * dgrp_dpa_read
+ *
+ * Copy data from the monitoring buffer to the user, freeing space
+ * in the monitoring buffer for more messages
+ */
+static ssize_t dgrp_dpa_read(struct file *file, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ struct nd_struct *nd;
+ int n;
+ int r;
+ int offset = 0;
+ int res = 0;
+ ssize_t rtn;
+ unsigned long lock_flags;
+
+ /*
+ * Get the node pointer, and quit if it doesn't exist.
+ */
+ nd = (struct nd_struct *)(file->private_data);
+ if (!nd)
+ return -ENXIO;
+
+ /*
+ * Wait for some data to appear in the buffer.
+ */
+
+ spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
+
+ for (;;) {
+ n = (nd->nd_dpa_in - nd->nd_dpa_out) & DPA_MASK;
+
+ if (n != 0)
+ break;
+
+ nd->nd_dpa_flag |= DPA_WAIT_DATA;
+
+ spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
+
+ /*
+ * Go to sleep waiting until the condition becomes true.
+ */
+ rtn = wait_event_interruptible(nd->nd_dpa_wqueue,
+ ((nd->nd_dpa_flag & DPA_WAIT_DATA) == 0));
+
+ if (rtn)
+ return rtn;
+
+ spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
+ }
+
+ /*
+ * Read whatever is there.
+ */
+
+ if (n > count)
+ n = count;
+
+ res = n;
+
+ r = DPA_MAX - nd->nd_dpa_out;
+
+ if (r <= n) {
+
+ spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
+ rtn = copy_to_user((void __user *)buf,
+ nd->nd_dpa_buf + nd->nd_dpa_out, r);
+ spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
+
+ if (rtn) {
+ rtn = -EFAULT;
+ goto done;
+ }
+
+ nd->nd_dpa_out = 0;
+ n -= r;
+ offset = r;
+ }
+
+ spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
+ rtn = copy_to_user((void __user *)buf + offset,
+ nd->nd_dpa_buf + nd->nd_dpa_out, n);
+ spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
+
+ if (rtn) {
+ rtn = -EFAULT;
+ goto done;
+ }
+
+ nd->nd_dpa_out += n;
+
+ *ppos += res;
+
+ rtn = res;
+
+ /*
+ * Wakeup any thread waiting for buffer space.
+ */
+
+ n = (nd->nd_dpa_in - nd->nd_dpa_out) & DPA_MASK;
+
+ if (nd->nd_dpa_flag & DPA_WAIT_SPACE &&
+ (DPA_MAX - n) > DPA_HIGH_WATER) {
+ nd->nd_dpa_flag &= ~DPA_WAIT_SPACE;
+ wake_up_interruptible(&nd->nd_dpa_wqueue);
+ }
+
+ done:
+ spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
+ return rtn;
+}
+
+static unsigned int dgrp_dpa_select(struct file *file,
+ struct poll_table_struct *table)
+{
+ unsigned int retval = 0;
+ struct nd_struct *nd = file->private_data;
+
+ if (nd->nd_dpa_out != nd->nd_dpa_in)
+ retval |= POLLIN | POLLRDNORM; /* Conditionally readable */
+
+ retval |= POLLOUT | POLLWRNORM; /* Always writeable */
+
+ return retval;
+}
+
+static long dgrp_dpa_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+
+ struct nd_struct *nd;
+ struct digi_chan getchan;
+ struct digi_node getnode;
+ struct ch_struct *ch;
+ struct digi_debug setdebug;
+ struct digi_vpd vpd;
+ unsigned int port;
+ void __user *uarg = (void __user *) arg;
+
+ nd = file->private_data;
+
+ switch (cmd) {
+ case DIGI_GETCHAN:
+ if (copy_from_user(&getchan, uarg, sizeof(struct digi_chan)))
+ return -EFAULT;
+
+ port = getchan.ch_port;
+
+ if (port < 0 || port > nd->nd_chan_count)
+ return -EINVAL;
+
+ ch = nd->nd_chan + port;
+
+ getchan.ch_open = (ch->ch_open_count > 0) ? 1 : 0;
+ getchan.ch_txcount = ch->ch_txcount;
+ getchan.ch_rxcount = ch->ch_rxcount;
+ getchan.ch_s_brate = ch->ch_s_brate;
+ getchan.ch_s_estat = ch->ch_s_elast;
+ getchan.ch_s_cflag = ch->ch_s_cflag;
+ getchan.ch_s_iflag = ch->ch_s_iflag;
+ getchan.ch_s_oflag = ch->ch_s_oflag;
+ getchan.ch_s_xflag = ch->ch_s_xflag;
+ getchan.ch_s_mstat = ch->ch_s_mlast;
+
+ if (copy_to_user(uarg, &getchan, sizeof(struct digi_chan)))
+ return -EFAULT;
+ break;
+
+
+ case DIGI_GETNODE:
+ getnode.nd_state = (nd->nd_state & NS_READY) ? 1 : 0;
+ getnode.nd_chan_count = nd->nd_chan_count;
+ getnode.nd_tx_byte = nd->nd_tx_byte;
+ getnode.nd_rx_byte = nd->nd_rx_byte;
+
+ memset(&getnode.nd_ps_desc, 0, MAX_DESC_LEN);
+ strncpy(getnode.nd_ps_desc, nd->nd_ps_desc, MAX_DESC_LEN);
+
+ if (copy_to_user(uarg, &getnode, sizeof(struct digi_node)))
+ return -EFAULT;
+ break;
+
+
+ case DIGI_SETDEBUG:
+ if (copy_from_user(&setdebug, uarg, sizeof(struct digi_debug)))
+ return -EFAULT;
+
+ nd->nd_dpa_debug = setdebug.onoff;
+ nd->nd_dpa_port = setdebug.port;
+ break;
+
+
+ case DIGI_GETVPD:
+ if (nd->nd_vpd_len > 0) {
+ vpd.vpd_len = nd->nd_vpd_len;
+ memcpy(&vpd.vpd_data, &nd->nd_vpd, nd->nd_vpd_len);
+ } else {
+ vpd.vpd_len = 0;
+ }
+
+ if (copy_to_user(uarg, &vpd, sizeof(struct digi_vpd)))
+ return -EFAULT;
+ break;
+ }
+
+ return 0;
+}
+
+/**
+ * dgrp_dpa() -- send data to the device monitor queue
+ * @nd: pointer to a node structure
+ * @buf: buffer of data to copy to the monitoring buffer
+ * @len: number of bytes to transfer to the buffer
+ *
+ * Called by the net device routines to send data to the device
+ * monitor queue. If the device monitor buffer is too full to
+ * accept the data, it waits until the buffer is ready.
+ */
+static void dgrp_dpa(struct nd_struct *nd, u8 *buf, int nbuf)
+{
+ int n;
+ int r;
+ unsigned long lock_flags;
+
+ /*
+ * Grab DPA lock.
+ */
+ spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
+
+ /*
+ * Loop while data remains.
+ */
+ while (nbuf > 0 && nd->nd_dpa_buf != NULL) {
+
+ n = (nd->nd_dpa_out - nd->nd_dpa_in - 1) & DPA_MASK;
+
+ /*
+ * Enforce flow control on the DPA device.
+ */
+ if (n < (DPA_MAX - DPA_HIGH_WATER))
+ nd->nd_dpa_flag |= DPA_WAIT_SPACE;
+
+ /*
+ * This should never happen, as the flow control above
+ * should have stopped things before they got to this point.
+ */
+ if (n == 0) {
+ spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
+ return;
+ }
+
+ /*
+ * Copy as much data as will fit.
+ */
+
+ if (n > nbuf)
+ n = nbuf;
+
+ r = DPA_MAX - nd->nd_dpa_in;
+
+ if (r <= n) {
+ memcpy(nd->nd_dpa_buf + nd->nd_dpa_in, buf, r);
+
+ n -= r;
+
+ nd->nd_dpa_in = 0;
+
+ buf += r;
+ nbuf -= r;
+ }
+
+ memcpy(nd->nd_dpa_buf + nd->nd_dpa_in, buf, n);
+
+ nd->nd_dpa_in += n;
+
+ buf += n;
+ nbuf -= n;
+
+ if (nd->nd_dpa_in >= DPA_MAX)
+ pr_info_ratelimited("%s - nd->nd_dpa_in (%i) >= DPA_MAX\n",
+ __func__, nd->nd_dpa_in);
+
+ /*
+ * Wakeup any thread waiting for data
+ */
+ if (nd->nd_dpa_flag & DPA_WAIT_DATA) {
+ nd->nd_dpa_flag &= ~DPA_WAIT_DATA;
+ wake_up_interruptible(&nd->nd_dpa_wqueue);
+ }
+ }
+
+ /*
+ * Release the DPA lock.
+ */
+ spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
+}
+
+/**
+ * dgrp_monitor_data() -- builds a DPA data packet
+ * @nd: pointer to a node structure
+ * @type: type of message to be logged in the DPA buffer
+ * @buf: buffer of data to be logged in the DPA buffer
+ * @size -- number of bytes in the "buf" buffer
+ */
+void dgrp_dpa_data(struct nd_struct *nd, int type, u8 *buf, int size)
+{
+ u8 header[5];
+
+ header[0] = type;
+
+ put_unaligned_be32(size, header + 1);
+
+ dgrp_dpa(nd, header, sizeof(header));
+ dgrp_dpa(nd, buf, size);
+}
--- /dev/null
+/*
+ *
+ * Copyright 1999-2003 Digi International (www.digi.com)
+ * Jeff Randall
+ * James Puzzo <jamesp at digi dot com>
+ * Scott Kilau <Scott_Kilau at digi dot com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ */
+
+/*
+ * Driver specific includes
+ */
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/init.h>
+
+/*
+ * PortServer includes
+ */
+#include "dgrp_common.h"
+
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Digi International, http://www.digi.com");
+MODULE_DESCRIPTION("RealPort driver for Digi's ethernet-based serial connectivity product line");
+MODULE_VERSION(DIGI_VERSION);
+
+struct list_head nd_struct_list;
+struct dgrp_poll_data dgrp_poll_data;
+
+int dgrp_rawreadok = 1; /* Bypass flipbuf on input */
+int dgrp_register_cudevices = 1;/* Turn on/off registering legacy cu devices */
+int dgrp_register_prdevices = 1;/* Turn on/off registering transparent print */
+int dgrp_poll_tick = 20; /* Poll interval - in ms */
+
+module_param_named(rawreadok, dgrp_rawreadok, int, 0644);
+MODULE_PARM_DESC(rawreadok, "Bypass flip buffers on input");
+
+module_param_named(register_cudevices, dgrp_register_cudevices, int, 0644);
+MODULE_PARM_DESC(register_cudevices, "Turn on/off registering legacy cu devices");
+
+module_param_named(register_prdevices, dgrp_register_prdevices, int, 0644);
+MODULE_PARM_DESC(register_prdevices, "Turn on/off registering transparent print devices");
+
+module_param_named(pollrate, dgrp_poll_tick, int, 0644);
+MODULE_PARM_DESC(pollrate, "Poll interval in ms");
+
+/* Driver load/unload functions */
+static int dgrp_init_module(void);
+static void dgrp_cleanup_module(void);
+
+module_init(dgrp_init_module);
+module_exit(dgrp_cleanup_module);
+
+/*
+ * init_module()
+ *
+ * Module load. This is where it all starts.
+ */
+static int dgrp_init_module(void)
+{
+ INIT_LIST_HEAD(&nd_struct_list);
+
+ spin_lock_init(&dgrp_poll_data.poll_lock);
+ init_timer(&dgrp_poll_data.timer);
+ dgrp_poll_data.poll_tick = dgrp_poll_tick;
+ dgrp_poll_data.timer.function = dgrp_poll_handler;
+ dgrp_poll_data.timer.data = (unsigned long) &dgrp_poll_data;
+
+ dgrp_create_class_sysfs_files();
+
+ dgrp_register_proc();
+
+ return 0;
+}
+
+
+/*
+ * Module unload. This is where it all ends.
+ */
+static void dgrp_cleanup_module(void)
+{
+ struct nd_struct *nd, *next;
+
+ /*
+ * Attempting to free resources in backwards
+ * order of allocation, in case that helps
+ * memory pool fragmentation.
+ */
+ dgrp_unregister_proc();
+
+ dgrp_remove_class_sysfs_files();
+
+
+ list_for_each_entry_safe(nd, next, &nd_struct_list, list) {
+ dgrp_tty_uninit(nd);
+ kfree(nd);
+ }
+}
--- /dev/null
+/*****************************************************************************
+ *
+ * Copyright 1999 Digi International (www.digi.com)
+ * James Puzzo <jamesp at digi dot com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ */
+
+/*
+ *
+ * Filename:
+ *
+ * dgrp_mon_ops.c
+ *
+ * Description:
+ *
+ * Handle the file operations required for the "monitor" devices.
+ * Includes those functions required to register the "mon" devices
+ * in "/proc".
+ *
+ * Author:
+ *
+ * James A. Puzzo
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/sched.h>
+#include <asm/unaligned.h>
+#include <linux/proc_fs.h>
+
+#include "dgrp_common.h"
+
+/* File operation declarations */
+static int dgrp_mon_open(struct inode *, struct file *);
+static int dgrp_mon_release(struct inode *, struct file *);
+static ssize_t dgrp_mon_read(struct file *, char __user *, size_t, loff_t *);
+static long dgrp_mon_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg);
+
+static const struct file_operations mon_ops = {
+ .owner = THIS_MODULE,
+ .read = dgrp_mon_read,
+ .unlocked_ioctl = dgrp_mon_ioctl,
+ .open = dgrp_mon_open,
+ .release = dgrp_mon_release,
+};
+
+static struct inode_operations mon_inode_ops = {
+ .permission = dgrp_inode_permission
+};
+
+void dgrp_register_mon_hook(struct proc_dir_entry *de)
+{
+ struct nd_struct *node = de->data;
+
+ de->proc_iops = &mon_inode_ops;
+ de->proc_fops = &mon_ops;
+ node->nd_mon_de = de;
+ sema_init(&node->nd_mon_semaphore, 1);
+}
+
+/**
+ * dgrp_mon_open() -- open /proc/dgrp/ports device for a PortServer
+ * @inode: struct inode *
+ * @file: struct file *
+ *
+ * Open function to open the /proc/dgrp/ports device for a PortServer.
+ */
+static int dgrp_mon_open(struct inode *inode, struct file *file)
+{
+ struct nd_struct *nd;
+ struct proc_dir_entry *de;
+ struct timeval tv;
+ uint32_t time;
+ u8 *buf;
+ int rtn;
+
+ rtn = try_module_get(THIS_MODULE);
+ if (!rtn)
+ return -ENXIO;
+
+ rtn = 0;
+
+ if (!capable(CAP_SYS_ADMIN)) {
+ rtn = -EPERM;
+ goto done;
+ }
+
+ /*
+ * Make sure that the "private_data" field hasn't already been used.
+ */
+ if (file->private_data) {
+ rtn = -EINVAL;
+ goto done;
+ }
+
+ /*
+ * Get the node pointer, and fail if it doesn't exist.
+ */
+ de = PDE(inode);
+ if (!de) {
+ rtn = -ENXIO;
+ goto done;
+ }
+
+ nd = (struct nd_struct *)de->data;
+ if (!nd) {
+ rtn = -ENXIO;
+ goto done;
+ }
+
+ file->private_data = (void *) nd;
+
+ /*
+ * Allocate the monitor buffer.
+ */
+
+ /*
+ * Grab the MON lock.
+ */
+ down(&nd->nd_mon_semaphore);
+
+ if (nd->nd_mon_buf) {
+ rtn = -EBUSY;
+ goto done_up;
+ }
+
+ nd->nd_mon_buf = kmalloc(MON_MAX, GFP_KERNEL);
+
+ if (!nd->nd_mon_buf) {
+ rtn = -ENOMEM;
+ goto done_up;
+ }
+
+ /*
+ * Enter an RPDUMP file header into the buffer.
+ */
+
+ buf = nd->nd_mon_buf;
+
+ strcpy(buf, RPDUMP_MAGIC);
+ buf += strlen(buf) + 1;
+
+ do_gettimeofday(&tv);
+
+ /*
+ * tv.tv_sec might be a 64 bit quantity. Pare
+ * it down to 32 bits before attempting to encode
+ * it.
+ */
+ time = (uint32_t) (tv.tv_sec & 0xffffffff);
+
+ put_unaligned_be32(time, buf);
+ put_unaligned_be16(0, buf + 4);
+ buf += 6;
+
+ if (nd->nd_tx_module) {
+ buf[0] = RPDUMP_CLIENT;
+ put_unaligned_be32(0, buf + 1);
+ put_unaligned_be16(1, buf + 5);
+ buf[7] = 0xf0 + nd->nd_tx_module;
+ buf += 8;
+ }
+
+ if (nd->nd_rx_module) {
+ buf[0] = RPDUMP_SERVER;
+ put_unaligned_be32(0, buf + 1);
+ put_unaligned_be16(1, buf + 5);
+ buf[7] = 0xf0 + nd->nd_rx_module;
+ buf += 8;
+ }
+
+ nd->nd_mon_out = 0;
+ nd->nd_mon_in = buf - nd->nd_mon_buf;
+ nd->nd_mon_lbolt = jiffies;
+
+done_up:
+ up(&nd->nd_mon_semaphore);
+
+done:
+ if (rtn)
+ module_put(THIS_MODULE);
+ return rtn;
+}
+
+
+/**
+ * dgrp_mon_release() - Close the MON device for a particular PortServer
+ * @inode: struct inode *
+ * @file: struct file *
+ */
+static int dgrp_mon_release(struct inode *inode, struct file *file)
+{
+ struct nd_struct *nd;
+
+ /*
+ * Get the node pointer, and quit if it doesn't exist.
+ */
+ nd = (struct nd_struct *)(file->private_data);
+ if (!nd)
+ goto done;
+
+ /*
+ * Free the monitor buffer.
+ */
+
+ down(&nd->nd_mon_semaphore);
+
+ kfree(nd->nd_mon_buf);
+ nd->nd_mon_buf = NULL;
+ nd->nd_mon_out = nd->nd_mon_in;
+
+ /*
+ * Wakeup any thread waiting for buffer space.
+ */
+
+ if (nd->nd_mon_flag & MON_WAIT_SPACE) {
+ nd->nd_mon_flag &= ~MON_WAIT_SPACE;
+ wake_up_interruptible(&nd->nd_mon_wqueue);
+ }
+
+ up(&nd->nd_mon_semaphore);
+
+ /*
+ * Make sure there is no thread in the middle of writing a packet.
+ */
+ down(&nd->nd_net_semaphore);
+ up(&nd->nd_net_semaphore);
+
+done:
+ module_put(THIS_MODULE);
+ file->private_data = NULL;
+ return 0;
+}
+
+/**
+ * dgrp_mon_read() -- Copy data from the monitoring buffer to the user
+ */
+static ssize_t dgrp_mon_read(struct file *file, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ struct nd_struct *nd;
+ int r;
+ int offset = 0;
+ int res = 0;
+ ssize_t rtn;
+
+ /*
+ * Get the node pointer, and quit if it doesn't exist.
+ */
+ nd = (struct nd_struct *)(file->private_data);
+ if (!nd)
+ return -ENXIO;
+
+ /*
+ * Wait for some data to appear in the buffer.
+ */
+
+ down(&nd->nd_mon_semaphore);
+
+ for (;;) {
+ res = (nd->nd_mon_in - nd->nd_mon_out) & MON_MASK;
+
+ if (res)
+ break;
+
+ nd->nd_mon_flag |= MON_WAIT_DATA;
+
+ up(&nd->nd_mon_semaphore);
+
+ /*
+ * Go to sleep waiting until the condition becomes true.
+ */
+ rtn = wait_event_interruptible(nd->nd_mon_wqueue,
+ ((nd->nd_mon_flag & MON_WAIT_DATA) == 0));
+
+ if (rtn)
+ return rtn;
+
+ down(&nd->nd_mon_semaphore);
+ }
+
+ /*
+ * Read whatever is there.
+ */
+
+ if (res > count)
+ res = count;
+
+ r = MON_MAX - nd->nd_mon_out;
+
+ if (r <= res) {
+ rtn = copy_to_user((void __user *)buf,
+ nd->nd_mon_buf + nd->nd_mon_out, r);
+ if (rtn) {
+ up(&nd->nd_mon_semaphore);
+ return -EFAULT;
+ }
+
+ nd->nd_mon_out = 0;
+ res -= r;
+ offset = r;
+ }
+
+ rtn = copy_to_user((void __user *) buf + offset,
+ nd->nd_mon_buf + nd->nd_mon_out, res);
+ if (rtn) {
+ up(&nd->nd_mon_semaphore);
+ return -EFAULT;
+ }
+
+ nd->nd_mon_out += res;
+
+ *ppos += res;
+
+ up(&nd->nd_mon_semaphore);
+
+ /*
+ * Wakeup any thread waiting for buffer space.
+ */
+
+ if (nd->nd_mon_flag & MON_WAIT_SPACE) {
+ nd->nd_mon_flag &= ~MON_WAIT_SPACE;
+ wake_up_interruptible(&nd->nd_mon_wqueue);
+ }
+
+ return res;
+}
+
+/* ioctl is not valid on monitor device */
+static long dgrp_mon_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ return -EINVAL;
+}
--- /dev/null
+/*
+ *
+ * Copyright 1999 Digi International (www.digi.com)
+ * James Puzzo <jamesp at digi dot com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ */
+
+/*
+ *
+ * Filename:
+ *
+ * dgrp_net_ops.c
+ *
+ * Description:
+ *
+ * Handle the file operations required for the "network" devices.
+ * Includes those functions required to register the "net" devices
+ * in "/proc".
+ *
+ * Author:
+ *
+ * James A. Puzzo
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/spinlock.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+#include <linux/ratelimit.h>
+#include <asm/unaligned.h>
+
+#define MYFLIPLEN TBUF_MAX
+
+#include "dgrp_common.h"
+
+#define TTY_FLIPBUF_SIZE 512
+#define DEVICE_NAME_SIZE 50
+
+/*
+ * Generic helper function declarations
+ */
+static void parity_scan(struct ch_struct *ch, unsigned char *cbuf,
+ unsigned char *fbuf, int *len);
+
+/*
+ * File operation declarations
+ */
+static int dgrp_net_open(struct inode *, struct file *);
+static int dgrp_net_release(struct inode *, struct file *);
+static ssize_t dgrp_net_read(struct file *, char __user *, size_t, loff_t *);
+static ssize_t dgrp_net_write(struct file *, const char __user *, size_t,
+ loff_t *);
+static long dgrp_net_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg);
+static unsigned int dgrp_net_select(struct file *file,
+ struct poll_table_struct *table);
+
+static const struct file_operations net_ops = {
+ .owner = THIS_MODULE,
+ .read = dgrp_net_read,
+ .write = dgrp_net_write,
+ .poll = dgrp_net_select,
+ .unlocked_ioctl = dgrp_net_ioctl,
+ .open = dgrp_net_open,
+ .release = dgrp_net_release,
+};
+
+static struct inode_operations net_inode_ops = {
+ .permission = dgrp_inode_permission
+};
+
+void dgrp_register_net_hook(struct proc_dir_entry *de)
+{
+ struct nd_struct *node = de->data;
+
+ de->proc_iops = &net_inode_ops;
+ de->proc_fops = &net_ops;
+ node->nd_net_de = de;
+ sema_init(&node->nd_net_semaphore, 1);
+ node->nd_state = NS_CLOSED;
+ dgrp_create_node_class_sysfs_files(node);
+}
+
+
+/**
+ * dgrp_dump() -- prints memory for debugging purposes.
+ * @mem: Memory location which should be printed to the console
+ * @len: Number of bytes to be dumped
+ */
+static void dgrp_dump(u8 *mem, int len)
+{
+ int i;
+
+ pr_debug("dgrp dump length = %d, data = ", len);
+ for (i = 0; i < len; ++i)
+ pr_debug("%.2x ", mem[i]);
+ pr_debug("\n");
+}
+
+/**
+ * dgrp_read_data_block() -- Read a data block
+ * @ch: struct ch_struct *
+ * @flipbuf: u8 *
+ * @flipbuf_size: size of flipbuf
+ */
+static void dgrp_read_data_block(struct ch_struct *ch, u8 *flipbuf,
+ int flipbuf_size)
+{
+ int t;
+ int n;
+
+ if (flipbuf_size <= 0)
+ return;
+
+ t = RBUF_MAX - ch->ch_rout;
+ n = flipbuf_size;
+
+ if (n >= t) {
+ memcpy(flipbuf, ch->ch_rbuf + ch->ch_rout, t);
+ flipbuf += t;
+ n -= t;
+ ch->ch_rout = 0;
+ }
+
+ memcpy(flipbuf, ch->ch_rbuf + ch->ch_rout, n);
+ flipbuf += n;
+ ch->ch_rout += n;
+}
+
+
+/**
+ * dgrp_input() -- send data to the line disipline
+ * @ch: pointer to channel struct
+ *
+ * Copys the rbuf to the flipbuf and sends to line discipline.
+ * Sends input buffer data to the line discipline.
+ *
+ * There are several modes to consider here:
+ * rawreadok, tty->real_raw, and IF_PARMRK
+ */
+static void dgrp_input(struct ch_struct *ch)
+{
+ struct nd_struct *nd;
+ struct tty_struct *tty;
+ int remain;
+ int data_len;
+ int len;
+ int flip_len;
+ int tty_count;
+ ulong lock_flags;
+ struct tty_ldisc *ld;
+ u8 *myflipbuf;
+ u8 *myflipflagbuf;
+
+ if (!ch)
+ return;
+
+ nd = ch->ch_nd;
+
+ if (!nd)
+ return;
+
+ spin_lock_irqsave(&nd->nd_lock, lock_flags);
+
+ myflipbuf = nd->nd_inputbuf;
+ myflipflagbuf = nd->nd_inputflagbuf;
+
+ if (!ch->ch_open_count) {
+ ch->ch_rout = ch->ch_rin;
+ goto out;
+ }
+
+ if (ch->ch_tun.un_flag & UN_CLOSING) {
+ ch->ch_rout = ch->ch_rin;
+ goto out;
+ }
+
+ tty = (ch->ch_tun).un_tty;
+
+
+ if (!tty || tty->magic != TTY_MAGIC) {
+ ch->ch_rout = ch->ch_rin;
+ goto out;
+ }
+
+ tty_count = tty->count;
+ if (!tty_count) {
+ ch->ch_rout = ch->ch_rin;
+ goto out;
+ }
+
+ if (tty->closing || test_bit(TTY_CLOSING, &tty->flags)) {
+ ch->ch_rout = ch->ch_rin;
+ goto out;
+ }
+
+ spin_unlock_irqrestore(&nd->nd_lock, lock_flags);
+
+ /* Decide how much data we can send into the tty layer */
+ if (dgrp_rawreadok && tty->real_raw)
+ flip_len = MYFLIPLEN;
+ else
+ flip_len = TTY_FLIPBUF_SIZE;
+
+ /* data_len should be the number of chars that we read in */
+ data_len = (ch->ch_rin - ch->ch_rout) & RBUF_MASK;
+ remain = data_len;
+
+ /* len is the amount of data we are going to transfer here */
+ len = min(data_len, flip_len);
+
+ /* take into consideration length of ldisc */
+ len = min(len, (N_TTY_BUF_SIZE - 1) - tty->read_cnt);
+
+ ld = tty_ldisc_ref(tty);
+
+ /*
+ * If we were unable to get a reference to the ld,
+ * don't flush our buffer, and act like the ld doesn't
+ * have any space to put the data right now.
+ */
+ if (!ld) {
+ len = 0;
+ } else if (!ld->ops->receive_buf) {
+ spin_lock_irqsave(&nd->nd_lock, lock_flags);
+ ch->ch_rout = ch->ch_rin;
+ spin_unlock_irqrestore(&nd->nd_lock, lock_flags);
+ len = 0;
+ }
+
+ /* Check DPA flow control */
+ if ((nd->nd_dpa_debug) &&
+ (nd->nd_dpa_flag & DPA_WAIT_SPACE) &&
+ (nd->nd_dpa_port == MINOR(tty_devnum(ch->ch_tun.un_tty))))
+ len = 0;
+
+ if ((len) && !(ch->ch_flag & CH_RXSTOP)) {
+
+ dgrp_read_data_block(ch, myflipbuf, len);
+
+ /*
+ * In high performance mode, we don't have to update
+ * flag_buf or any of the counts or pointers into flip buf.
+ */
+ if (!dgrp_rawreadok || !tty->real_raw) {
+ if (I_PARMRK(tty) || I_BRKINT(tty) || I_INPCK(tty))
+ parity_scan(ch, myflipbuf, myflipflagbuf, &len);
+ else
+ memset(myflipflagbuf, TTY_NORMAL, len);
+ }
+
+ if ((nd->nd_dpa_debug) &&
+ (nd->nd_dpa_port == PORT_NUM(MINOR(tty_devnum(tty)))))
+ dgrp_dpa_data(nd, 1, myflipbuf, len);
+
+ /*
+ * If we're doing raw reads, jam it right into the
+ * line disc bypassing the flip buffers.
+ */
+ if (dgrp_rawreadok && tty->real_raw)
+ ld->ops->receive_buf(tty, myflipbuf, NULL, len);
+ else {
+ len = tty_buffer_request_room(tty, len);
+ tty_insert_flip_string_flags(tty, myflipbuf,
+ myflipflagbuf, len);
+
+ /* Tell the tty layer its okay to "eat" the data now */
+ tty_flip_buffer_push(tty);
+ }
+
+ ch->ch_rxcount += len;
+ }
+
+ if (ld)
+ tty_ldisc_deref(ld);
+
+ /*
+ * Wake up any sleepers (maybe dgrp close) that might be waiting
+ * for a channel flag state change.
+ */
+ wake_up_interruptible(&ch->ch_flag_wait);
+ return;
+
+out:
+ spin_unlock_irqrestore(&nd->nd_lock, lock_flags);
+}
+
+
+/*
+ * parity_scan
+ *
+ * Loop to inspect each single character or 0xFF escape.
+ *
+ * if PARMRK & ~DOSMODE:
+ * 0xFF 0xFF Normal 0xFF character, escaped
+ * to eliminate confusion.
+ * 0xFF 0x00 0x00 Break
+ * 0xFF 0x00 CC Error character CC.
+ * CC Normal character CC.
+ *
+ * if PARMRK & DOSMODE:
+ * 0xFF 0x18 0x00 Break
+ * 0xFF 0x08 0x00 Framing Error
+ * 0xFF 0x04 0x00 Parity error
+ * 0xFF 0x0C 0x00 Both Framing and Parity error
+ *
+ * TODO: do we need to do the XMODEM, XOFF, XON, XANY processing??
+ * as per protocol
+ */
+static void parity_scan(struct ch_struct *ch, unsigned char *cbuf,
+ unsigned char *fbuf, int *len)
+{
+ int l = *len;
+ int count = 0;
+ int DOS = ((ch->ch_iflag & IF_DOSMODE) == 0 ? 0 : 1);
+ unsigned char *cout; /* character buffer */
+ unsigned char *fout; /* flag buffer */
+ unsigned char *in;
+ unsigned char c;
+
+ in = cbuf;
+ cout = cbuf;
+ fout = fbuf;
+
+ while (l--) {
+ c = *in;
+ in++;
+
+ switch (ch->ch_pscan_state) {
+ default:
+ /* reset to sanity and fall through */
+ ch->ch_pscan_state = 0 ;
+
+ case 0:
+ /* No FF seen yet */
+ if (c == 0xff) /* delete this character from stream */
+ ch->ch_pscan_state = 1;
+ else {
+ *cout++ = c;
+ *fout++ = TTY_NORMAL;
+ count += 1;
+ }
+ break;
+
+ case 1:
+ /* first FF seen */
+ if (c == 0xff) {
+ /* doubled ff, transform to single ff */
+ *cout++ = c;
+ *fout++ = TTY_NORMAL;
+ count += 1;
+ ch->ch_pscan_state = 0;
+ } else {
+ /* save value examination in next state */
+ ch->ch_pscan_savechar = c;
+ ch->ch_pscan_state = 2;
+ }
+ break;
+
+ case 2:
+ /* third character of ff sequence */
+ *cout++ = c;
+ if (DOS) {
+ if (ch->ch_pscan_savechar & 0x10)
+ *fout++ = TTY_BREAK;
+ else if (ch->ch_pscan_savechar & 0x08)
+ *fout++ = TTY_FRAME;
+ else
+ /*
+ * either marked as a parity error,
+ * indeterminate, or not in DOSMODE
+ * call it a parity error
+ */
+ *fout++ = TTY_PARITY;
+ } else {
+ /* case FF XX ?? where XX is not 00 */
+ if (ch->ch_pscan_savechar & 0xff) {
+ /* this should not happen */
+ pr_info("%s: parity_scan: error unexpected byte\n",
+ __func__);
+ *fout++ = TTY_PARITY;
+ }
+ /* case FF 00 XX where XX is not 00 */
+ else if (c == 0xff)
+ *fout++ = TTY_PARITY;
+ /* case FF 00 00 */
+ else
+ *fout++ = TTY_BREAK;
+
+ }
+ count += 1;
+ ch->ch_pscan_state = 0;
+ }
+ }
+ *len = count;
+}
+
+
+/**
+ * dgrp_net_idle() -- Idle the network connection
+ * @nd: pointer to node structure to idle
+ */
+static void dgrp_net_idle(struct nd_struct *nd)
+{
+ struct ch_struct *ch;
+ int i;
+
+ nd->nd_tx_work = 1;
+
+ nd->nd_state = NS_IDLE;
+ nd->nd_flag = 0;
+
+ for (i = nd->nd_seq_out; ; i = (i + 1) & SEQ_MASK) {
+ if (!nd->nd_seq_wait[i]) {
+ nd->nd_seq_wait[i] = 0;
+ wake_up_interruptible(&nd->nd_seq_wque[i]);
+ }
+
+ if (i == nd->nd_seq_in)
+ break;
+ }
+
+ nd->nd_seq_out = nd->nd_seq_in;
+
+ nd->nd_unack = 0;
+ nd->nd_remain = 0;
+
+ nd->nd_tx_module = 0x10;
+ nd->nd_rx_module = 0x00;
+
+ for (i = 0, ch = nd->nd_chan; i < CHAN_MAX; i++, ch++) {
+ ch->ch_state = CS_IDLE;
+
+ ch->ch_otype = 0;
+ ch->ch_otype_waiting = 0;
+ }
+}
+
+/*
+ * Increase the number of channels, waking up any
+ * threads that might be waiting for the channels
+ * to appear.
+ */
+static void increase_channel_count(struct nd_struct *nd, int n)
+{
+ struct ch_struct *ch;
+ struct device *classp;
+ char name[DEVICE_NAME_SIZE];
+ int ret;
+ u8 *buf;
+ int i;
+
+ for (i = nd->nd_chan_count; i < n; ++i) {
+ ch = nd->nd_chan + i;
+
+ /* FIXME: return a useful error instead! */
+ buf = kmalloc(TBUF_MAX, GFP_KERNEL);
+ if (!buf)
+ return;
+
+ if (ch->ch_tbuf)
+ pr_info_ratelimited("%s - ch_tbuf was not NULL\n",
+ __func__);
+
+ ch->ch_tbuf = buf;
+
+ buf = kmalloc(RBUF_MAX, GFP_KERNEL);
+ if (!buf)
+ return;
+
+ if (ch->ch_rbuf)
+ pr_info("%s - ch_rbuf was not NULL\n",
+ __func__);
+ ch->ch_rbuf = buf;
+
+ classp = tty_port_register_device(&ch->port,
+ nd->nd_serial_ttdriver, i,
+ NULL);
+
+ ch->ch_tun.un_sysfs = classp;
+ snprintf(name, DEVICE_NAME_SIZE, "tty_%d", i);
+
+ dgrp_create_tty_sysfs(&ch->ch_tun, classp);
+ ret = sysfs_create_link(&nd->nd_class_dev->kobj,
+ &classp->kobj, name);
+
+ /* NOTE: We don't support "cu" devices anymore,
+ * so you will notice we don't register them
+ * here anymore. */
+ if (dgrp_register_prdevices) {
+ classp = tty_register_device(nd->nd_xprint_ttdriver,
+ i, NULL);
+ ch->ch_pun.un_sysfs = classp;
+ snprintf(name, DEVICE_NAME_SIZE, "pr_%d", i);
+
+ dgrp_create_tty_sysfs(&ch->ch_pun, classp);
+ ret = sysfs_create_link(&nd->nd_class_dev->kobj,
+ &classp->kobj, name);
+ }
+
+ nd->nd_chan_count = i + 1;
+ wake_up_interruptible(&ch->ch_flag_wait);
+ }
+}
+
+/*
+ * Decrease the number of channels, and wake up any threads that might
+ * be waiting on the channels that vanished.
+ */
+static void decrease_channel_count(struct nd_struct *nd, int n)
+{
+ struct ch_struct *ch;
+ char name[DEVICE_NAME_SIZE];
+ int i;
+
+ for (i = nd->nd_chan_count - 1; i >= n; --i) {
+ ch = nd->nd_chan + i;
+
+ /*
+ * Make any open ports inoperative.
+ */
+ ch->ch_state = CS_IDLE;
+
+ ch->ch_otype = 0;
+ ch->ch_otype_waiting = 0;
+
+ /*
+ * Only "HANGUP" if we care about carrier
+ * transitions and we are already open.
+ */
+ if (ch->ch_open_count != 0) {
+ ch->ch_flag |= CH_HANGUP;
+ dgrp_carrier(ch);
+ }
+
+ /*
+ * Unlike the CH_HANGUP flag above, use another
+ * flag to indicate to the RealPort state machine
+ * that this port has disappeared.
+ */
+ if (ch->ch_open_count != 0)
+ ch->ch_flag |= CH_PORT_GONE;
+
+ wake_up_interruptible(&ch->ch_flag_wait);
+
+ nd->nd_chan_count = i;
+
+ kfree(ch->ch_tbuf);
+ ch->ch_tbuf = NULL;
+
+ kfree(ch->ch_rbuf);
+ ch->ch_rbuf = NULL;
+
+ nd->nd_chan_count = i;
+
+ dgrp_remove_tty_sysfs(ch->ch_tun.un_sysfs);
+ snprintf(name, DEVICE_NAME_SIZE, "tty_%d", i);
+ sysfs_remove_link(&nd->nd_class_dev->kobj, name);
+ tty_unregister_device(nd->nd_serial_ttdriver, i);
+
+ /*
+ * NOTE: We don't support "cu" devices anymore, so don't
+ * unregister them here anymore.
+ */
+
+ if (dgrp_register_prdevices) {
+ dgrp_remove_tty_sysfs(ch->ch_pun.un_sysfs);
+ snprintf(name, DEVICE_NAME_SIZE, "pr_%d", i);
+ sysfs_remove_link(&nd->nd_class_dev->kobj, name);
+ tty_unregister_device(nd->nd_xprint_ttdriver, i);
+ }
+ }
+}
+
+/**
+ * dgrp_chan_count() -- Adjust the node channel count.
+ * @nd: pointer to a node structure
+ * @n: new value for channel count
+ *
+ * Adjusts the node channel count. If new ports have appeared, it tries
+ * to signal those processes that might have been waiting for ports to
+ * appear. If ports have disappeared it tries to signal those processes
+ * that might be hung waiting for a response for the now non-existant port.
+ */
+static void dgrp_chan_count(struct nd_struct *nd, int n)
+{
+ if (n == nd->nd_chan_count)
+ return;
+
+ if (n > nd->nd_chan_count)
+ increase_channel_count(nd, n);
+
+ if (n < nd->nd_chan_count)
+ decrease_channel_count(nd, n);
+}
+
+/**
+ * dgrp_monitor() -- send data to the device monitor queue
+ * @nd: pointer to a node structure
+ * @buf: data to copy to the monitoring buffer
+ * @len: number of bytes to transfer to the buffer
+ *
+ * Called by the net device routines to send data to the device
+ * monitor queue. If the device monitor buffer is too full to
+ * accept the data, it waits until the buffer is ready.
+ */
+static void dgrp_monitor(struct nd_struct *nd, u8 *buf, int len)
+{
+ int n;
+ int r;
+ int rtn;
+
+ /*
+ * Grab monitor lock.
+ */
+ down(&nd->nd_mon_semaphore);
+
+ /*
+ * Loop while data remains.
+ */
+ while ((len > 0) && (nd->nd_mon_buf)) {
+ /*
+ * Determine the amount of available space left in the
+ * buffer. If there's none, wait until some appears.
+ */
+
+ n = (nd->nd_mon_out - nd->nd_mon_in - 1) & MON_MASK;
+
+ if (!n) {
+ nd->nd_mon_flag |= MON_WAIT_SPACE;
+
+ up(&nd->nd_mon_semaphore);
+
+ /*
+ * Go to sleep waiting until the condition becomes true.
+ */
+ rtn = wait_event_interruptible(nd->nd_mon_wqueue,
+ ((nd->nd_mon_flag & MON_WAIT_SPACE) == 0));
+
+/* FIXME: really ignore rtn? */
+
+ /*
+ * We can't exit here if we receive a signal, since
+ * to do so would trash the debug stream.
+ */
+
+ down(&nd->nd_mon_semaphore);
+
+ continue;
+ }
+
+ /*
+ * Copy as much data as will fit.
+ */
+
+ if (n > len)
+ n = len;
+
+ r = MON_MAX - nd->nd_mon_in;
+
+ if (r <= n) {
+ memcpy(nd->nd_mon_buf + nd->nd_mon_in, buf, r);
+
+ n -= r;
+
+ nd->nd_mon_in = 0;
+
+ buf += r;
+ len -= r;
+ }
+
+ memcpy(nd->nd_mon_buf + nd->nd_mon_in, buf, n);
+
+ nd->nd_mon_in += n;
+
+ buf += n;
+ len -= n;
+
+ if (nd->nd_mon_in >= MON_MAX)
+ pr_info_ratelimited("%s - nd_mon_in (%i) >= MON_MAX\n",
+ __func__, nd->nd_mon_in);
+
+ /*
+ * Wakeup any thread waiting for data
+ */
+
+ if (nd->nd_mon_flag & MON_WAIT_DATA) {
+ nd->nd_mon_flag &= ~MON_WAIT_DATA;
+ wake_up_interruptible(&nd->nd_mon_wqueue);
+ }
+ }
+
+ /*
+ * Release the monitor lock.
+ */
+ up(&nd->nd_mon_semaphore);
+}
+
+/**
+ * dgrp_encode_time() -- Encodes rpdump time into a 4-byte quantity.
+ * @nd: pointer to a node structure
+ * @buf: destination buffer
+ *
+ * Encodes "rpdump" time into a 4-byte quantity. Time is measured since
+ * open.
+ */
+static void dgrp_encode_time(struct nd_struct *nd, u8 *buf)
+{
+ ulong t;
+
+ /*
+ * Convert time in HZ since open to time in milliseconds
+ * since open.
+ */
+ t = jiffies - nd->nd_mon_lbolt;
+ t = 1000 * (t / HZ) + 1000 * (t % HZ) / HZ;
+
+ put_unaligned_be32((uint)(t & 0xffffffff), buf);
+}
+
+
+
+/**
+ * dgrp_monitor_message() -- Builds a rpdump style message.
+ * @nd: pointer to a node structure
+ * @message: destination buffer
+ */
+static void dgrp_monitor_message(struct nd_struct *nd, char *message)
+{
+ u8 header[7];
+ int n;
+
+ header[0] = RPDUMP_MESSAGE;
+
+ dgrp_encode_time(nd, header + 1);
+
+ n = strlen(message);
+
+ put_unaligned_be16(n, header + 5);
+
+ dgrp_monitor(nd, header, sizeof(header));
+ dgrp_monitor(nd, (u8 *) message, n);
+}
+
+
+
+/**
+ * dgrp_monitor_reset() -- Note a reset in the monitoring buffer.
+ * @nd: pointer to a node structure
+ */
+static void dgrp_monitor_reset(struct nd_struct *nd)
+{
+ u8 header[5];
+
+ header[0] = RPDUMP_RESET;
+
+ dgrp_encode_time(nd, header + 1);
+
+ dgrp_monitor(nd, header, sizeof(header));
+}
+
+/**
+ * dgrp_monitor_data() -- builds a monitor data packet
+ * @nd: pointer to a node structure
+ * @type: type of message to be logged
+ * @buf: data to be logged
+ * @size: number of bytes in the buffer
+ */
+static void dgrp_monitor_data(struct nd_struct *nd, u8 type, u8 *buf, int size)
+{
+ u8 header[7];
+
+ header[0] = type;
+
+ dgrp_encode_time(nd, header + 1);
+
+ put_unaligned_be16(size, header + 5);
+
+ dgrp_monitor(nd, header, sizeof(header));
+ dgrp_monitor(nd, buf, size);
+}
+
+static int alloc_nd_buffers(struct nd_struct *nd)
+{
+
+ nd->nd_iobuf = NULL;
+ nd->nd_writebuf = NULL;
+ nd->nd_inputbuf = NULL;
+ nd->nd_inputflagbuf = NULL;
+
+ /*
+ * Allocate the network read/write buffer.
+ */
+ nd->nd_iobuf = kzalloc(UIO_MAX + 10, GFP_KERNEL);
+ if (!nd->nd_iobuf)
+ goto out_err;
+
+ /*
+ * Allocate a buffer for doing the copy from user space to
+ * kernel space in the write routines.
+ */
+ nd->nd_writebuf = kzalloc(WRITEBUFLEN, GFP_KERNEL);
+ if (!nd->nd_writebuf)
+ goto out_err;
+
+ /*
+ * Allocate a buffer for doing the copy from kernel space to
+ * tty buffer space in the read routines.
+ */
+ nd->nd_inputbuf = kzalloc(MYFLIPLEN, GFP_KERNEL);
+ if (!nd->nd_inputbuf)
+ goto out_err;
+
+ /*
+ * Allocate a buffer for doing the copy from kernel space to
+ * tty buffer space in the read routines.
+ */
+ nd->nd_inputflagbuf = kzalloc(MYFLIPLEN, GFP_KERNEL);
+ if (!nd->nd_inputflagbuf)
+ goto out_err;
+
+ return 0;
+
+out_err:
+ kfree(nd->nd_iobuf);
+ kfree(nd->nd_writebuf);
+ kfree(nd->nd_inputbuf);
+ kfree(nd->nd_inputflagbuf);
+ return -ENOMEM;
+}
+
+/*
+ * dgrp_net_open() -- Open the NET device for a particular PortServer
+ */
+static int dgrp_net_open(struct inode *inode, struct file *file)
+{
+ struct nd_struct *nd;
+ struct proc_dir_entry *de;
+ ulong lock_flags;
+ int rtn;
+
+ rtn = try_module_get(THIS_MODULE);
+ if (!rtn)
+ return -EAGAIN;
+
+ if (!capable(CAP_SYS_ADMIN)) {
+ rtn = -EPERM;
+ goto done;
+ }
+
+ /*
+ * Make sure that the "private_data" field hasn't already been used.
+ */
+ if (file->private_data) {
+ rtn = -EINVAL;
+ goto done;
+ }
+
+ /*
+ * Get the node pointer, and fail if it doesn't exist.
+ */
+ de = PDE(inode);
+ if (!de) {
+ rtn = -ENXIO;
+ goto done;
+ }
+
+ nd = (struct nd_struct *) de->data;
+ if (!nd) {
+ rtn = -ENXIO;
+ goto done;
+ }
+
+ file->private_data = (void *) nd;
+
+ /*
+ * Grab the NET lock.
+ */
+ down(&nd->nd_net_semaphore);
+
+ if (nd->nd_state != NS_CLOSED) {
+ rtn = -EBUSY;
+ goto unlock;
+ }
+
+ /*
+ * Initialize the link speed parameters.
+ */
+
+ nd->nd_link.lk_fast_rate = UIO_MAX;
+ nd->nd_link.lk_slow_rate = UIO_MAX;
+
+ nd->nd_link.lk_fast_delay = 1000;
+ nd->nd_link.lk_slow_delay = 1000;
+
+ nd->nd_link.lk_header_size = 46;
+
+
+ rtn = alloc_nd_buffers(nd);
+ if (rtn)
+ goto unlock;
+
+ /*
+ * The port is now open, so move it to the IDLE state
+ */
+ dgrp_net_idle(nd);
+
+ nd->nd_tx_time = jiffies;
+
+ /*
+ * If the polling routing is not running, start it running here
+ */
+ spin_lock_irqsave(&dgrp_poll_data.poll_lock, lock_flags);
+
+ if (!dgrp_poll_data.node_active_count) {
+ dgrp_poll_data.node_active_count = 2;
+ dgrp_poll_data.timer.expires = jiffies +
+ dgrp_poll_tick * HZ / 1000;
+ add_timer(&dgrp_poll_data.timer);
+ }
+
+ spin_unlock_irqrestore(&dgrp_poll_data.poll_lock, lock_flags);
+
+ dgrp_monitor_message(nd, "Net Open");
+
+unlock:
+ /*
+ * Release the NET lock.
+ */
+ up(&nd->nd_net_semaphore);
+
+done:
+ if (rtn)
+ module_put(THIS_MODULE);
+
+ return rtn;
+}
+
+/* dgrp_net_release() -- close the NET device for a particular PortServer */
+static int dgrp_net_release(struct inode *inode, struct file *file)
+{
+ struct nd_struct *nd;
+ ulong lock_flags;
+
+ nd = (struct nd_struct *)(file->private_data);
+ if (!nd)
+ goto done;
+
+/* TODO : historical locking placeholder */
+/*
+ * In the HPUX version of the RealPort driver (which served as a basis
+ * for this driver) this locking code was used. Saved if ever we need
+ * to review the locking under Linux.
+ */
+/* spinlock(&nd->nd_lock); */
+
+
+ /*
+ * Grab the NET lock.
+ */
+ down(&nd->nd_net_semaphore);
+
+ /*
+ * Before "closing" the internal connection, make sure all
+ * ports are "idle".
+ */
+ dgrp_net_idle(nd);
+
+ nd->nd_state = NS_CLOSED;
+ nd->nd_flag = 0;
+
+ /*
+ * TODO ... must the wait queue be reset on close?
+ * should any pending waiters be reset?
+ * Let's decide to assert that the waitq is empty... and see
+ * how soon we break.
+ */
+ if (waitqueue_active(&nd->nd_tx_waitq))
+ pr_info("%s - expected waitqueue_active to be false\n",
+ __func__);
+
+ nd->nd_send = 0;
+
+ kfree(nd->nd_iobuf);
+ nd->nd_iobuf = NULL;
+
+/* TODO : historical locking placeholder */
+/*
+ * In the HPUX version of the RealPort driver (which served as a basis
+ * for this driver) this locking code was used. Saved if ever we need
+ * to review the locking under Linux.
+ */
+/* spinunlock( &nd->nd_lock ); */
+
+
+ kfree(nd->nd_writebuf);
+ nd->nd_writebuf = NULL;
+
+ kfree(nd->nd_inputbuf);
+ nd->nd_inputbuf = NULL;
+
+ kfree(nd->nd_inputflagbuf);
+ nd->nd_inputflagbuf = NULL;
+
+/* TODO : historical locking placeholder */
+/*
+ * In the HPUX version of the RealPort driver (which served as a basis
+ * for this driver) this locking code was used. Saved if ever we need
+ * to review the locking under Linux.
+ */
+/* spinlock(&nd->nd_lock); */
+
+ /*
+ * Set the active port count to zero.
+ */
+ dgrp_chan_count(nd, 0);
+
+/* TODO : historical locking placeholder */
+/*
+ * In the HPUX version of the RealPort driver (which served as a basis
+ * for this driver) this locking code was used. Saved if ever we need
+ * to review the locking under Linux.
+ */
+/* spinunlock(&nd->nd_lock); */
+
+ /*
+ * Release the NET lock.
+ */
+ up(&nd->nd_net_semaphore);
+
+ /*
+ * Cause the poller to stop scheduling itself if this is
+ * the last active node.
+ */
+ spin_lock_irqsave(&dgrp_poll_data.poll_lock, lock_flags);
+
+ if (dgrp_poll_data.node_active_count == 2) {
+ del_timer(&dgrp_poll_data.timer);
+ dgrp_poll_data.node_active_count = 0;
+ }
+
+ spin_unlock_irqrestore(&dgrp_poll_data.poll_lock, lock_flags);
+
+done:
+ down(&nd->nd_net_semaphore);
+
+ dgrp_monitor_message(nd, "Net Close");
+
+ up(&nd->nd_net_semaphore);
+
+ module_put(THIS_MODULE);
+ file->private_data = NULL;
+ return 0;
+}
+
+/* used in dgrp_send to setup command header */
+static inline u8 *set_cmd_header(u8 *b, u8 port, u8 cmd)
+{
+ *b++ = 0xb0 + (port & 0x0f);
+ *b++ = cmd;
+ return b;
+}
+
+/**
+ * dgrp_send() -- build a packet for transmission to the server
+ * @nd: pointer to a node structure
+ * @tmax: maximum bytes to transmit
+ *
+ * returns number of bytes sent
+ */
+static int dgrp_send(struct nd_struct *nd, long tmax)
+{
+ struct ch_struct *ch = nd->nd_chan;
+ u8 *b;
+ u8 *buf;
+ u8 *mbuf;
+ u8 port;
+ int mod;
+ long send;
+ int maxport;
+ long lastport = -1;
+ ushort rwin;
+ long in;
+ ushort n;
+ long t;
+ long ttotal;
+ long tchan;
+ long tsend;
+ ushort tsafe;
+ long work;
+ long send_sync;
+ long wanted_sync_port = -1;
+ ushort tdata[CHAN_MAX];
+ long used_buffer;
+
+ mbuf = nd->nd_iobuf + UIO_BASE;
+ buf = b = mbuf;
+
+ send_sync = nd->nd_link.lk_slow_rate < UIO_MAX;
+
+ ttotal = 0;
+ tchan = 0;
+
+ memset(tdata, 0, sizeof(tdata));
+
+
+ /*
+ * If there are any outstanding requests to be serviced,
+ * service them here.
+ */
+ if (nd->nd_send & NR_PASSWORD) {
+
+ /*
+ * Send Password response.
+ */
+
+ b[0] = 0xfc;
+ b[1] = 0x20;
+ put_unaligned_be16(strlen(nd->password), b + 2);
+ b += 4;
+ b += strlen(nd->password);
+ nd->nd_send &= ~(NR_PASSWORD);
+ }
+
+
+ /*
+ * Loop over all modules to generate commands, and determine
+ * the amount of data queued for transmit.
+ */
+
+ for (mod = 0, port = 0; port < nd->nd_chan_count; mod++) {
+ /*
+ * If this is not the current module, enter a module select
+ * code in the buffer.
+ */
+
+ if (mod != nd->nd_tx_module)
+ mbuf = ++b;
+
+ /*
+ * Loop to process one module.
+ */
+
+ maxport = port + 16;
+
+ if (maxport > nd->nd_chan_count)
+ maxport = nd->nd_chan_count;
+
+ for (; port < maxport; port++, ch++) {
+ /*
+ * Switch based on channel state.
+ */
+
+ switch (ch->ch_state) {
+ /*
+ * Send requests when the port is closed, and there
+ * are no Open, Close or Cancel requests expected.
+ */
+
+ case CS_IDLE:
+ /*
+ * Wait until any open error code
+ * has been delivered to all
+ * associated ports.
+ */
+
+ if (ch->ch_open_error) {
+ if (ch->ch_wait_count[ch->ch_otype]) {
+ work = 1;
+ break;
+ }
+
+ ch->ch_open_error = 0;
+ }
+
+ /*
+ * Wait until the channel HANGUP flag is reset
+ * before sending the first open. We can only
+ * get to this state after a server disconnect.
+ */
+
+ if ((ch->ch_flag & CH_HANGUP) != 0)
+ break;
+
+ /*
+ * If recovering from a TCP disconnect, or if
+ * there is an immediate open pending, send an
+ * Immediate Open request.
+ */
+ if ((ch->ch_flag & CH_PORT_GONE) ||
+ ch->ch_wait_count[OTYPE_IMMEDIATE] != 0) {
+ b = set_cmd_header(b, port, 10);
+ *b++ = 0;
+
+ ch->ch_state = CS_WAIT_OPEN;
+ ch->ch_otype = OTYPE_IMMEDIATE;
+ break;
+ }
+
+ /*
+ * If there is no Persistent or Incoming Open on the wait
+ * list in the server, and a thread is waiting for a
+ * Persistent or Incoming Open, send a Persistent or Incoming
+ * Open Request.
+ */
+ if (ch->ch_otype_waiting == 0) {
+ if (ch->ch_wait_count[OTYPE_PERSISTENT] != 0) {
+ b = set_cmd_header(b, port, 10);
+ *b++ = 1;
+
+ ch->ch_state = CS_WAIT_OPEN;
+ ch->ch_otype = OTYPE_PERSISTENT;
+ } else if (ch->ch_wait_count[OTYPE_INCOMING] != 0) {
+ b = set_cmd_header(b, port, 10);
+ *b++ = 2;
+
+ ch->ch_state = CS_WAIT_OPEN;
+ ch->ch_otype = OTYPE_INCOMING;
+ }
+ break;
+ }
+
+ /*
+ * If a Persistent or Incoming Open is pending in
+ * the server, but there is no longer an open
+ * thread waiting for it, cancel the request.
+ */
+
+ if (ch->ch_wait_count[ch->ch_otype_waiting] == 0) {
+ b = set_cmd_header(b, port, 10);
+ *b++ = 4;
+
+ ch->ch_state = CS_WAIT_CANCEL;
+ ch->ch_otype = ch->ch_otype_waiting;
+ }
+ break;
+
+ /*
+ * Send port parameter queries.
+ */
+ case CS_SEND_QUERY:
+ /*
+ * Clear out all FEP state that might remain
+ * from the last connection.
+ */
+
+ ch->ch_flag |= CH_PARAM;
+
+ ch->ch_flag &= ~CH_RX_FLUSH;
+
+ ch->ch_expect = 0;
+
+ ch->ch_s_tin = 0;
+ ch->ch_s_tpos = 0;
+ ch->ch_s_tsize = 0;
+ ch->ch_s_treq = 0;
+ ch->ch_s_elast = 0;
+
+ ch->ch_s_rin = 0;
+ ch->ch_s_rwin = 0;
+ ch->ch_s_rsize = 0;
+
+ ch->ch_s_tmax = 0;
+ ch->ch_s_ttime = 0;
+ ch->ch_s_rmax = 0;
+ ch->ch_s_rtime = 0;
+ ch->ch_s_rlow = 0;
+ ch->ch_s_rhigh = 0;
+
+ ch->ch_s_brate = 0;
+ ch->ch_s_iflag = 0;
+ ch->ch_s_cflag = 0;
+ ch->ch_s_oflag = 0;
+ ch->ch_s_xflag = 0;
+
+ ch->ch_s_mout = 0;
+ ch->ch_s_mflow = 0;
+ ch->ch_s_mctrl = 0;
+ ch->ch_s_xon = 0;
+ ch->ch_s_xoff = 0;
+ ch->ch_s_lnext = 0;
+ ch->ch_s_xxon = 0;
+ ch->ch_s_xxoff = 0;
+
+ /* Send Sequence Request */
+ b = set_cmd_header(b, port, 14);
+
+ /* Configure Event Conditions Packet */
+ b = set_cmd_header(b, port, 42);
+ put_unaligned_be16(0x02c0, b);
+ b += 2;
+ *b++ = (DM_DTR | DM_RTS | DM_CTS |
+ DM_DSR | DM_RI | DM_CD);
+
+ /* Send Status Request */
+ b = set_cmd_header(b, port, 16);
+
+ /* Send Buffer Request */
+ b = set_cmd_header(b, port, 20);
+
+ /* Send Port Capability Request */
+ b = set_cmd_header(b, port, 22);
+
+ ch->ch_expect = (RR_SEQUENCE |
+ RR_STATUS |
+ RR_BUFFER |
+ RR_CAPABILITY);
+
+ ch->ch_state = CS_WAIT_QUERY;
+
+ /* Raise modem signals */
+ b = set_cmd_header(b, port, 44);
+
+ if (ch->ch_flag & CH_PORT_GONE)
+ ch->ch_s_mout = ch->ch_mout;
+ else
+ ch->ch_s_mout = ch->ch_mout = DM_DTR | DM_RTS;
+
+ *b++ = ch->ch_mout;
+ *b++ = ch->ch_s_mflow = 0;
+ *b++ = ch->ch_s_mctrl = ch->ch_mctrl = 0;
+
+ if (ch->ch_flag & CH_PORT_GONE)
+ ch->ch_flag &= ~CH_PORT_GONE;
+
+ break;
+
+ /*
+ * Handle normal open and ready mode.
+ */
+
+ case CS_READY:
+
+ /*
+ * If the port is not open, and there are no
+ * no longer any ports requesting an open,
+ * then close the port.
+ */
+
+ if (ch->ch_open_count == 0 &&
+ ch->ch_wait_count[ch->ch_otype] == 0) {
+ goto send_close;
+ }
+
+ /*
+ * Process waiting input.
+ *
+ * If there is no one to read it, discard the data.
+ *
+ * Otherwise if we are not in fastcook mode, or if there is a
+ * fastcook thread waiting for data, send the data to the
+ * line discipline.
+ */
+ if (ch->ch_rin != ch->ch_rout) {
+ if (ch->ch_tun.un_open_count == 0 ||
+ (ch->ch_tun.un_flag & UN_CLOSING) ||
+ (ch->ch_cflag & CF_CREAD) == 0) {
+ ch->ch_rout = ch->ch_rin;
+ } else if ((ch->ch_flag & CH_FAST_READ) == 0 ||
+ ch->ch_inwait != 0) {
+ dgrp_input(ch);
+
+ if (ch->ch_rin != ch->ch_rout)
+ work = 1;
+ }
+ }
+
+ /*
+ * Handle receive flush, and changes to
+ * server port parameters.
+ */
+
+ if (ch->ch_flag & (CH_RX_FLUSH | CH_PARAM)) {
+ /*
+ * If we are in receive flush mode,
+ * and enough data has gone by, reset
+ * receive flush mode.
+ */
+ if (ch->ch_flag & CH_RX_FLUSH) {
+ if (((ch->ch_flush_seq - nd->nd_seq_out) & SEQ_MASK) >
+ ((nd->nd_seq_in - nd->nd_seq_out) & SEQ_MASK))
+ ch->ch_flag &= ~CH_RX_FLUSH;
+ else
+ work = 1;
+ }
+
+ /*
+ * Send TMAX, TTIME.
+ */
+
+ if (ch->ch_s_tmax != ch->ch_tmax ||
+ ch->ch_s_ttime != ch->ch_ttime) {
+ b = set_cmd_header(b, port, 48);
+
+ ch->ch_s_tmax = ch->ch_tmax;
+ ch->ch_s_ttime = ch->ch_ttime;
+
+ put_unaligned_be16(ch->ch_s_tmax,
+ b);
+ b += 2;
+
+ put_unaligned_be16(ch->ch_s_ttime,
+ b);
+ b += 2;
+ }
+
+ /*
+ * Send RLOW, RHIGH.
+ */
+
+ if (ch->ch_s_rlow != ch->ch_rlow ||
+ ch->ch_s_rhigh != ch->ch_rhigh) {
+ b = set_cmd_header(b, port, 45);
+
+ ch->ch_s_rlow = ch->ch_rlow;
+ ch->ch_s_rhigh = ch->ch_rhigh;
+
+ put_unaligned_be16(ch->ch_s_rlow,
+ b);
+ b += 2;
+
+ put_unaligned_be16(ch->ch_s_rhigh,
+ b);
+ b += 2;
+ }
+
+ /*
+ * Send BRATE, CFLAG, IFLAG,
+ * OFLAG, XFLAG.
+ */
+
+ if (ch->ch_s_brate != ch->ch_brate ||
+ ch->ch_s_cflag != ch->ch_cflag ||
+ ch->ch_s_iflag != ch->ch_iflag ||
+ ch->ch_s_oflag != ch->ch_oflag ||
+ ch->ch_s_xflag != ch->ch_xflag) {
+ b = set_cmd_header(b, port, 40);
+
+ ch->ch_s_brate = ch->ch_brate;
+ ch->ch_s_cflag = ch->ch_cflag;
+ ch->ch_s_iflag = ch->ch_iflag;
+ ch->ch_s_oflag = ch->ch_oflag;
+ ch->ch_s_xflag = ch->ch_xflag;
+
+ put_unaligned_be16(ch->ch_s_brate,
+ b);
+ b += 2;
+
+ put_unaligned_be16(ch->ch_s_cflag,
+ b);
+ b += 2;
+
+ put_unaligned_be16(ch->ch_s_iflag,
+ b);
+ b += 2;
+
+ put_unaligned_be16(ch->ch_s_oflag,
+ b);
+ b += 2;
+
+ put_unaligned_be16(ch->ch_s_xflag,
+ b);
+ b += 2;
+ }
+
+ /*
+ * Send MOUT, MFLOW, MCTRL.
+ */
+
+ if (ch->ch_s_mout != ch->ch_mout ||
+ ch->ch_s_mflow != ch->ch_mflow ||
+ ch->ch_s_mctrl != ch->ch_mctrl) {
+ b = set_cmd_header(b, port, 44);
+
+ *b++ = ch->ch_s_mout = ch->ch_mout;
+ *b++ = ch->ch_s_mflow = ch->ch_mflow;
+ *b++ = ch->ch_s_mctrl = ch->ch_mctrl;
+ }
+
+ /*
+ * Send Flow control characters.
+ */
+
+ if (ch->ch_s_xon != ch->ch_xon ||
+ ch->ch_s_xoff != ch->ch_xoff ||
+ ch->ch_s_lnext != ch->ch_lnext ||
+ ch->ch_s_xxon != ch->ch_xxon ||
+ ch->ch_s_xxoff != ch->ch_xxoff) {
+ b = set_cmd_header(b, port, 46);
+
+ *b++ = ch->ch_s_xon = ch->ch_xon;
+ *b++ = ch->ch_s_xoff = ch->ch_xoff;
+ *b++ = ch->ch_s_lnext = ch->ch_lnext;
+ *b++ = ch->ch_s_xxon = ch->ch_xxon;
+ *b++ = ch->ch_s_xxoff = ch->ch_xxoff;
+ }
+
+ /*
+ * Send RMAX, RTIME.
+ */
+
+ if (ch->ch_s_rmax != ch->ch_rmax ||
+ ch->ch_s_rtime != ch->ch_rtime) {
+ b = set_cmd_header(b, port, 47);
+
+ ch->ch_s_rmax = ch->ch_rmax;
+ ch->ch_s_rtime = ch->ch_rtime;
+
+ put_unaligned_be16(ch->ch_s_rmax,
+ b);
+ b += 2;
+
+ put_unaligned_be16(ch->ch_s_rtime,
+ b);
+ b += 2;
+ }
+
+ ch->ch_flag &= ~CH_PARAM;
+ wake_up_interruptible(&ch->ch_flag_wait);
+ }
+
+
+ /*
+ * Handle action commands.
+ */
+
+ if (ch->ch_send != 0) {
+ /* int send = ch->ch_send & ~ch->ch_expect; */
+ send = ch->ch_send & ~ch->ch_expect;
+
+ /* Send character immediate */
+ if ((send & RR_TX_ICHAR) != 0) {
+ b = set_cmd_header(b, port, 60);
+
+ *b++ = ch->ch_xon;
+ ch->ch_expect |= RR_TX_ICHAR;
+ }
+
+ /* BREAK request */
+ if ((send & RR_TX_BREAK) != 0) {
+ if (ch->ch_break_time != 0) {
+ b = set_cmd_header(b, port, 61);
+ put_unaligned_be16(ch->ch_break_time,
+ b);
+ b += 2;
+
+ ch->ch_expect |= RR_TX_BREAK;
+ ch->ch_break_time = 0;
+ } else {
+ ch->ch_send &= ~RR_TX_BREAK;
+ ch->ch_flag &= ~CH_TX_BREAK;
+ wake_up_interruptible(&ch->ch_flag_wait);
+ }
+ }
+
+ /*
+ * Flush input/output buffers.
+ */
+
+ if ((send & (RR_RX_FLUSH | RR_TX_FLUSH)) != 0) {
+ b = set_cmd_header(b, port, 62);
+
+ *b++ = ((send & RR_TX_FLUSH) == 0 ? 1 :
+ (send & RR_RX_FLUSH) == 0 ? 2 : 3);
+
+ if (send & RR_RX_FLUSH) {
+ ch->ch_flush_seq = nd->nd_seq_in;
+ ch->ch_flag |= CH_RX_FLUSH;
+ work = 1;
+ send_sync = 1;
+ wanted_sync_port = port;
+ }
+
+ ch->ch_send &= ~(RR_RX_FLUSH | RR_TX_FLUSH);
+ }
+
+ /* Pause input/output */
+ if ((send & (RR_RX_STOP | RR_TX_STOP)) != 0) {
+ b = set_cmd_header(b, port, 63);
+ *b = 0;
+
+ if ((send & RR_TX_STOP) != 0)
+ *b |= EV_OPU;
+
+ if ((send & RR_RX_STOP) != 0)
+ *b |= EV_IPU;
+
+ b++;
+
+ ch->ch_send &= ~(RR_RX_STOP | RR_TX_STOP);
+ }
+
+ /* Start input/output */
+ if ((send & (RR_RX_START | RR_TX_START)) != 0) {
+ b = set_cmd_header(b, port, 64);
+ *b = 0;
+
+ if ((send & RR_TX_START) != 0)
+ *b |= EV_OPU | EV_OPS | EV_OPX;
+
+ if ((send & RR_RX_START) != 0)
+ *b |= EV_IPU | EV_IPS;
+
+ b++;
+
+ ch->ch_send &= ~(RR_RX_START | RR_TX_START);
+ }
+ }
+
+
+ /*
+ * Send a window sequence to acknowledge received data.
+ */
+
+ rwin = (ch->ch_s_rin +
+ ((ch->ch_rout - ch->ch_rin - 1) & RBUF_MASK));
+
+ n = (rwin - ch->ch_s_rwin) & 0xffff;
+
+ if (n >= RBUF_MAX / 4) {
+ b[0] = 0xa0 + (port & 0xf);
+ ch->ch_s_rwin = rwin;
+ put_unaligned_be16(rwin, b + 1);
+ b += 3;
+ }
+
+ /*
+ * If the terminal is waiting on LOW
+ * water or EMPTY, and the condition
+ * is now satisfied, call the line
+ * discipline to put more data in the
+ * buffer.
+ */
+
+ n = (ch->ch_tin - ch->ch_tout) & TBUF_MASK;
+
+ if ((ch->ch_tun.un_flag & (UN_EMPTY|UN_LOW)) != 0) {
+ if ((ch->ch_tun.un_flag & UN_LOW) != 0 ?
+ (n <= TBUF_LOW) :
+ (n == 0 && ch->ch_s_tpos == ch->ch_s_tin)) {
+ ch->ch_tun.un_flag &= ~(UN_EMPTY|UN_LOW);
+
+ if (waitqueue_active(&((ch->ch_tun.un_tty)->write_wait)))
+ wake_up_interruptible(&((ch->ch_tun.un_tty)->write_wait));
+ tty_wakeup(ch->ch_tun.un_tty);
+ n = (ch->ch_tin - ch->ch_tout) & TBUF_MASK;
+ }
+ }
+
+ /*
+ * If the printer is waiting on LOW
+ * water, TIME, EMPTY or PWAIT, and is
+ * now ready to put more data in the
+ * buffer, call the line discipline to
+ * do the job.
+ */
+
+ if (ch->ch_pun.un_open_count &&
+ (ch->ch_pun.un_flag &
+ (UN_EMPTY|UN_TIME|UN_LOW|UN_PWAIT)) != 0) {
+
+ if ((ch->ch_pun.un_flag & UN_LOW) != 0 ?
+ (n <= TBUF_LOW) :
+ (ch->ch_pun.un_flag & UN_TIME) != 0 ?
+ ((jiffies - ch->ch_waketime) >= 0) :
+ (n == 0 && ch->ch_s_tpos == ch->ch_s_tin) &&
+ ((ch->ch_pun.un_flag & UN_EMPTY) != 0 ||
+ ((ch->ch_tun.un_open_count &&
+ ch->ch_tun.un_tty->ops->chars_in_buffer) ?
+ (ch->ch_tun.un_tty->ops->chars_in_buffer)(ch->ch_tun.un_tty) == 0
+ : 1
+ )
+ )) {
+ ch->ch_pun.un_flag &= ~(UN_EMPTY | UN_TIME | UN_LOW | UN_PWAIT);
+
+ if (waitqueue_active(&((ch->ch_pun.un_tty)->write_wait)))
+ wake_up_interruptible(&((ch->ch_pun.un_tty)->write_wait));
+ tty_wakeup(ch->ch_pun.un_tty);
+ n = (ch->ch_tin - ch->ch_tout) & TBUF_MASK;
+
+ } else if ((ch->ch_pun.un_flag & UN_TIME) != 0) {
+ work = 1;
+ }
+ }
+
+
+ /*
+ * Determine the max number of bytes
+ * this port can send, including
+ * packet header overhead.
+ */
+
+ t = ((ch->ch_s_tsize + ch->ch_s_tpos - ch->ch_s_tin) & 0xffff);
+
+ if (n > t)
+ n = t;
+
+ if (n != 0) {
+ n += (n <= 8 ? 1 : n <= 255 ? 2 : 3);
+
+ tdata[tchan++] = n;
+ ttotal += n;
+ }
+ break;
+
+ /*
+ * Close the port.
+ */
+
+send_close:
+ case CS_SEND_CLOSE:
+ b = set_cmd_header(b, port, 10);
+ if (ch->ch_otype == OTYPE_IMMEDIATE)
+ *b++ = 3;
+ else
+ *b++ = 4;
+
+ ch->ch_state = CS_WAIT_CLOSE;
+ break;
+
+ /*
+ * Wait for a previous server request.
+ */
+
+ case CS_WAIT_OPEN:
+ case CS_WAIT_CANCEL:
+ case CS_WAIT_FAIL:
+ case CS_WAIT_QUERY:
+ case CS_WAIT_CLOSE:
+ break;
+
+ default:
+ pr_info("%s - unexpected channel state (%i)\n",
+ __func__, ch->ch_state);
+ }
+ }
+
+ /*
+ * If a module select code is needed, drop one in. If space
+ * was reserved for one, but none is needed, recover the space.
+ */
+
+ if (mod != nd->nd_tx_module) {
+ if (b != mbuf) {
+ mbuf[-1] = 0xf0 | mod;
+ nd->nd_tx_module = mod;
+ } else {
+ b--;
+ }
+ }
+ }
+
+ /*
+ * Adjust "tmax" so that under worst case conditions we do
+ * not overflow either the daemon buffer or the internal
+ * buffer in the loop that follows. Leave a safe area
+ * of 64 bytes so we start getting asserts before we start
+ * losing data or clobbering memory.
+ */
+
+ n = UIO_MAX - UIO_BASE;
+
+ if (tmax > n)
+ tmax = n;
+
+ tmax -= 64;
+
+ tsafe = tmax;
+
+ /*
+ * Allocate space for 5 Module Selects, 1 Sequence Request,
+ * and 1 Set TREQ for each active channel.
+ */
+
+ tmax -= 5 + 3 + 4 * nd->nd_chan_count;
+
+ /*
+ * Further reduce "tmax" to the available transmit credit.
+ * Note that this is a soft constraint; The transmit credit
+ * can go negative for a time and then recover.
+ */
+
+ n = nd->nd_tx_deposit - nd->nd_tx_charge - nd->nd_link.lk_header_size;
+
+ if (tmax > n)
+ tmax = n;
+
+ /*
+ * Finally reduce tmax by the number of bytes already in
+ * the buffer.
+ */
+
+ tmax -= b - buf;
+
+ /*
+ * Suspend data transmit unless every ready channel can send
+ * at least 1 character.
+ */
+ if (tmax < 2 * nd->nd_chan_count) {
+ tsend = 1;
+
+ } else if (tchan > 1 && ttotal > tmax) {
+
+ /*
+ * If transmit is limited by the credit budget, find the
+ * largest number of characters we can send without driving
+ * the credit negative.
+ */
+
+ long tm = tmax;
+ int tc = tchan;
+ int try;
+
+ tsend = tm / tc;
+
+ for (try = 0; try < 3; try++) {
+ int i;
+ int c = 0;
+
+ for (i = 0; i < tc; i++) {
+ if (tsend < tdata[i])
+ tdata[c++] = tdata[i];
+ else
+ tm -= tdata[i];
+ }
+
+ if (c == tc)
+ break;
+
+ tsend = tm / c;
+
+ if (c == 1)
+ break;
+
+ tc = c;
+ }
+
+ tsend = tm / nd->nd_chan_count;
+
+ if (tsend < 2)
+ tsend = 1;
+
+ } else {
+ /*
+ * If no budgetary constraints, or only one channel ready
+ * to send, set the character limit to the remaining
+ * buffer size.
+ */
+
+ tsend = tmax;
+ }
+
+ tsend -= (tsend <= 9) ? 1 : (tsend <= 257) ? 2 : 3;
+
+ /*
+ * Loop over all channels, sending queued data.
+ */
+
+ port = 0;
+ ch = nd->nd_chan;
+ used_buffer = tmax;
+
+ for (mod = 0; port < nd->nd_chan_count; mod++) {
+ /*
+ * If this is not the current module, enter a module select
+ * code in the buffer.
+ */
+
+ if (mod != nd->nd_tx_module)
+ mbuf = ++b;
+
+ /*
+ * Loop to process one module.
+ */
+
+ maxport = port + 16;
+
+ if (maxport > nd->nd_chan_count)
+ maxport = nd->nd_chan_count;
+
+ for (; port < maxport; port++, ch++) {
+ if (ch->ch_state != CS_READY)
+ continue;
+
+ lastport = port;
+
+ n = (ch->ch_tin - ch->ch_tout) & TBUF_MASK;
+
+ /*
+ * If there is data that can be sent, send it.
+ */
+
+ if (n != 0 && used_buffer > 0) {
+ t = (ch->ch_s_tsize + ch->ch_s_tpos - ch->ch_s_tin) & 0xffff;
+
+ if (n > t)
+ n = t;
+
+ if (n > tsend) {
+ work = 1;
+ n = tsend;
+ }
+
+ if (n > used_buffer) {
+ work = 1;
+ n = used_buffer;
+ }
+
+ if (n <= 0)
+ continue;
+
+ /*
+ * Create the correct size transmit header,
+ * depending on the amount of data to transmit.
+ */
+
+ if (n <= 8) {
+
+ b[0] = ((n - 1) << 4) + (port & 0xf);
+ b += 1;
+
+ } else if (n <= 255) {
+
+ b[0] = 0x80 + (port & 0xf);
+ b[1] = n;
+ b += 2;
+
+ } else {
+
+ b[0] = 0x90 + (port & 0xf);
+ put_unaligned_be16(n, b + 1);
+ b += 3;
+ }
+
+ ch->ch_s_tin = (ch->ch_s_tin + n) & 0xffff;
+
+ /*
+ * Copy transmit data to the packet.
+ */
+
+ t = TBUF_MAX - ch->ch_tout;
+
+ if (n >= t) {
+ memcpy(b, ch->ch_tbuf + ch->ch_tout, t);
+ b += t;
+ n -= t;
+ used_buffer -= t;
+ ch->ch_tout = 0;
+ }
+
+ memcpy(b, ch->ch_tbuf + ch->ch_tout, n);
+ b += n;
+ used_buffer -= n;
+ ch->ch_tout += n;
+ n = (ch->ch_tin - ch->ch_tout) & TBUF_MASK;
+ }
+
+ /*
+ * Wake any terminal unit process waiting in the
+ * dgrp_write routine for low water.
+ */
+
+ if (n > TBUF_LOW)
+ continue;
+
+ if ((ch->ch_flag & CH_LOW) != 0) {
+ ch->ch_flag &= ~CH_LOW;
+ wake_up_interruptible(&ch->ch_flag_wait);
+ }
+
+ /* selwakeup tty_sel */
+ if (ch->ch_tun.un_open_count) {
+ struct tty_struct *tty = (ch->ch_tun.un_tty);
+
+ if (waitqueue_active(&tty->write_wait))
+ wake_up_interruptible(&tty->write_wait);
+
+ tty_wakeup(tty);
+ }
+
+ if (ch->ch_pun.un_open_count) {
+ struct tty_struct *tty = (ch->ch_pun.un_tty);
+
+ if (waitqueue_active(&tty->write_wait))
+ wake_up_interruptible(&tty->write_wait);
+
+ tty_wakeup(tty);
+ }
+
+ /*
+ * Do EMPTY processing.
+ */
+
+ if (n != 0)
+ continue;
+
+ if ((ch->ch_flag & (CH_EMPTY | CH_DRAIN)) != 0 ||
+ (ch->ch_pun.un_flag & UN_EMPTY) != 0) {
+ /*
+ * If there is still data in the server, ask the server
+ * to notify us when its all gone.
+ */
+
+ if (ch->ch_s_treq != ch->ch_s_tin) {
+ b = set_cmd_header(b, port, 43);
+
+ ch->ch_s_treq = ch->ch_s_tin;
+ put_unaligned_be16(ch->ch_s_treq,
+ b);
+ b += 2;
+ }
+
+ /*
+ * If there is a thread waiting for buffer empty,
+ * and we are truly empty, wake the thread.
+ */
+
+ else if ((ch->ch_flag & CH_EMPTY) != 0 &&
+ (ch->ch_send & RR_TX_BREAK) == 0) {
+ ch->ch_flag &= ~CH_EMPTY;
+
+ wake_up_interruptible(&ch->ch_flag_wait);
+ }
+ }
+ }
+
+ /*
+ * If a module select code is needed, drop one in. If space
+ * was reserved for one, but none is needed, recover the space.
+ */
+
+ if (mod != nd->nd_tx_module) {
+ if (b != mbuf) {
+ mbuf[-1] = 0xf0 | mod;
+ nd->nd_tx_module = mod;
+ } else {
+ b--;
+ }
+ }
+ }
+
+ /*
+ * Send a synchronization sequence associated with the last open
+ * channel that sent data, and remember the time when the data was
+ * sent.
+ */
+
+ in = nd->nd_seq_in;
+
+ if ((send_sync || nd->nd_seq_wait[in] != 0) && lastport >= 0) {
+ u8 *bb = b;
+
+ /*
+ * Attempt the use the port that really wanted the sync.
+ * This gets around a race condition where the "lastport" is in
+ * the middle of the close() routine, and by the time we
+ * send this command, it will have already acked the close, and
+ * thus not send the sync response.
+ */
+ if (wanted_sync_port >= 0)
+ lastport = wanted_sync_port;
+ /*
+ * Set a flag just in case the port is in the middle of a close,
+ * it will not be permitted to actually close until we get an
+ * sync response, and clear the flag there.
+ */
+ ch = nd->nd_chan + lastport;
+ ch->ch_flag |= CH_WAITING_SYNC;
+
+ mod = lastport >> 4;
+
+ if (mod != nd->nd_tx_module) {
+ bb[0] = 0xf0 + mod;
+ bb += 1;
+
+ nd->nd_tx_module = mod;
+ }
+
+ bb = set_cmd_header(bb, lastport, 12);
+ *bb++ = in;
+
+ nd->nd_seq_size[in] = bb - buf;
+ nd->nd_seq_time[in] = jiffies;
+
+ if (++in >= SEQ_MAX)
+ in = 0;
+
+ if (in != nd->nd_seq_out) {
+ b = bb;
+ nd->nd_seq_in = in;
+ nd->nd_unack += b - buf;
+ }
+ }
+
+ /*
+ * If there are no open ports, a sync cannot be sent.
+ * There is nothing left to wait for anyway, so wake any
+ * thread waiting for an acknowledgement.
+ */
+
+ else if (nd->nd_seq_wait[in] != 0) {
+ nd->nd_seq_wait[in] = 0;
+
+ wake_up_interruptible(&nd->nd_seq_wque[in]);
+ }
+
+ /*
+ * If there is no traffic for an interval of IDLE_MAX, then
+ * send a single byte packet.
+ */
+
+ if (b != buf) {
+ nd->nd_tx_time = jiffies;
+ } else if ((ulong)(jiffies - nd->nd_tx_time) >= IDLE_MAX) {
+ *b++ = 0xf0 | nd->nd_tx_module;
+ nd->nd_tx_time = jiffies;
+ }
+
+ n = b - buf;
+
+ if (n >= tsafe)
+ pr_info("%s - n(%i) >= tsafe(%i)\n",
+ __func__, n, tsafe);
+
+ if (tsend < 0)
+ dgrp_dump(buf, n);
+
+ nd->nd_tx_work = work;
+
+ return n;
+}
+
+/*
+ * dgrp_net_read()
+ * Data to be sent TO the PortServer from the "async." half of the driver.
+ */
+static ssize_t dgrp_net_read(struct file *file, char __user *buf, size_t count,
+ loff_t *ppos)
+{
+ struct nd_struct *nd;
+ long n;
+ u8 *local_buf;
+ u8 *b;
+ ssize_t rtn;
+
+ /*
+ * Get the node pointer, and quit if it doesn't exist.
+ */
+ nd = (struct nd_struct *)(file->private_data);
+ if (!nd)
+ return -ENXIO;
+
+ if (count < UIO_MIN)
+ return -EINVAL;
+
+ /*
+ * Only one read/write operation may be in progress at
+ * any given time.
+ */
+
+ /*
+ * Grab the NET lock.
+ */
+ down(&nd->nd_net_semaphore);
+
+ nd->nd_read_count++;
+
+ nd->nd_tx_ready = 0;
+
+ /*
+ * Determine the effective size of the buffer.
+ */
+
+ if (nd->nd_remain > UIO_BASE)
+ pr_info_ratelimited("%s - nd_remain(%i) > UIO_BASE\n",
+ __func__, nd->nd_remain);
+
+ b = local_buf = nd->nd_iobuf + UIO_BASE;
+
+ /*
+ * Generate data according to the node state.
+ */
+
+ switch (nd->nd_state) {
+ /*
+ * Initialize the connection.
+ */
+
+ case NS_IDLE:
+ if (nd->nd_mon_buf)
+ dgrp_monitor_reset(nd);
+
+ /*
+ * Request a Product ID Packet.
+ */
+
+ b[0] = 0xfb;
+ b[1] = 0x01;
+ b += 2;
+
+ nd->nd_expect |= NR_IDENT;
+
+ /*
+ * Request a Server Capability ID Response.
+ */
+
+ b[0] = 0xfb;
+ b[1] = 0x02;
+ b += 2;
+
+ nd->nd_expect |= NR_CAPABILITY;
+
+ /*
+ * Request a Server VPD Response.
+ */
+
+ b[0] = 0xfb;
+ b[1] = 0x18;
+ b += 2;
+
+ nd->nd_expect |= NR_VPD;
+
+ nd->nd_state = NS_WAIT_QUERY;
+ break;
+
+ /*
+ * We do serious communication with the server only in
+ * the READY state.
+ */
+
+ case NS_READY:
+ b = dgrp_send(nd, count) + local_buf;
+ break;
+
+ /*
+ * Send off an error after receiving a bogus message
+ * from the server.
+ */
+
+ case NS_SEND_ERROR:
+ n = strlen(nd->nd_error);
+
+ b[0] = 0xff;
+ b[1] = n;
+ memcpy(b + 2, nd->nd_error, n);
+ b += 2 + n;
+
+ dgrp_net_idle(nd);
+ /*
+ * Set the active port count to zero.
+ */
+ dgrp_chan_count(nd, 0);
+ break;
+
+ default:
+ break;
+ }
+
+ n = b - local_buf;
+
+ if (n != 0) {
+ nd->nd_send_count++;
+
+ nd->nd_tx_byte += n + nd->nd_link.lk_header_size;
+ nd->nd_tx_charge += n + nd->nd_link.lk_header_size;
+ }
+
+ rtn = copy_to_user((void __user *)buf, local_buf, n);
+ if (rtn) {
+ rtn = -EFAULT;
+ goto done;
+ }
+
+ *ppos += n;
+
+ rtn = n;
+
+ if (nd->nd_mon_buf)
+ dgrp_monitor_data(nd, RPDUMP_CLIENT, local_buf, n);
+
+ /*
+ * Release the NET lock.
+ */
+done:
+ up(&nd->nd_net_semaphore);
+
+ return rtn;
+}
+
+/**
+ * dgrp_receive() -- decode data packets received from the remote PortServer.
+ * @nd: pointer to a node structure
+ */
+static void dgrp_receive(struct nd_struct *nd)
+{
+ struct ch_struct *ch;
+ u8 *buf;
+ u8 *b;
+ u8 *dbuf;
+ char *error;
+ long port;
+ long dlen;
+ long plen;
+ long remain;
+ long n;
+ long mlast;
+ long elast;
+ long mstat;
+ long estat;
+
+ char ID[3];
+
+ nd->nd_tx_time = jiffies;
+
+ ID_TO_CHAR(nd->nd_ID, ID);
+
+ b = buf = nd->nd_iobuf;
+ remain = nd->nd_remain;
+
+ /*
+ * Loop to process Realport protocol packets.
+ */
+
+ while (remain > 0) {
+ int n0 = b[0] >> 4;
+ int n1 = b[0] & 0x0f;
+
+ if (n0 <= 12) {
+ port = (nd->nd_rx_module << 4) + n1;
+
+ if (port >= nd->nd_chan_count) {
+ error = "Improper Port Number";
+ goto prot_error;
+ }
+
+ ch = nd->nd_chan + port;
+ } else {
+ port = -1;
+ ch = NULL;
+ }
+
+ /*
+ * Process by major packet type.
+ */
+
+ switch (n0) {
+
+ /*
+ * Process 1-byte header data packet.
+ */
+
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ case 5:
+ case 6:
+ case 7:
+ dlen = n0 + 1;
+ plen = dlen + 1;
+
+ dbuf = b + 1;
+ goto data;
+
+ /*
+ * Process 2-byte header data packet.
+ */
+
+ case 8:
+ if (remain < 3)
+ goto done;
+
+ dlen = b[1];
+ plen = dlen + 2;
+
+ dbuf = b + 2;
+ goto data;
+
+ /*
+ * Process 3-byte header data packet.
+ */
+
+ case 9:
+ if (remain < 4)
+ goto done;
+
+ dlen = get_unaligned_be16(b + 1);
+ plen = dlen + 3;
+
+ dbuf = b + 3;
+
+ /*
+ * Common packet handling code.
+ */
+
+data:
+ nd->nd_tx_work = 1;
+
+ /*
+ * Otherwise data should appear only when we are
+ * in the CS_READY state.
+ */
+
+ if (ch->ch_state < CS_READY) {
+ error = "Data received before RWIN established";
+ goto prot_error;
+ }
+
+ /*
+ * Assure that the data received is within the
+ * allowable window.
+ */
+
+ n = (ch->ch_s_rwin - ch->ch_s_rin) & 0xffff;
+
+ if (dlen > n) {
+ error = "Receive data overrun";
+ goto prot_error;
+ }
+
+ /*
+ * If we received 3 or less characters,
+ * assume it is a human typing, and set RTIME
+ * to 10 milliseconds.
+ *
+ * If we receive 10 or more characters,
+ * assume its not a human typing, and set RTIME
+ * to 100 milliseconds.
+ */
+
+ if (ch->ch_edelay != DGRP_RTIME) {
+ if (ch->ch_rtime != ch->ch_edelay) {
+ ch->ch_rtime = ch->ch_edelay;
+ ch->ch_flag |= CH_PARAM;
+ }
+ } else if (dlen <= 3) {
+ if (ch->ch_rtime != 10) {
+ ch->ch_rtime = 10;
+ ch->ch_flag |= CH_PARAM;
+ }
+ } else {
+ if (ch->ch_rtime != DGRP_RTIME) {
+ ch->ch_rtime = DGRP_RTIME;
+ ch->ch_flag |= CH_PARAM;
+ }
+ }
+
+ /*
+ * If a portion of the packet is outside the
+ * buffer, shorten the effective length of the
+ * data packet to be the amount of data received.
+ */
+
+ if (remain < plen)
+ dlen -= plen - remain;
+
+ /*
+ * Detect if receive flush is now complete.
+ */
+
+ if ((ch->ch_flag & CH_RX_FLUSH) != 0 &&
+ ((ch->ch_flush_seq - nd->nd_seq_out) & SEQ_MASK) >=
+ ((nd->nd_seq_in - nd->nd_seq_out) & SEQ_MASK)) {
+ ch->ch_flag &= ~CH_RX_FLUSH;
+ }
+
+ /*
+ * If we are ready to receive, move the data into
+ * the receive buffer.
+ */
+
+ ch->ch_s_rin = (ch->ch_s_rin + dlen) & 0xffff;
+
+ if (ch->ch_state == CS_READY &&
+ (ch->ch_tun.un_open_count != 0) &&
+ (ch->ch_tun.un_flag & UN_CLOSING) == 0 &&
+ (ch->ch_cflag & CF_CREAD) != 0 &&
+ (ch->ch_flag & (CH_BAUD0 | CH_RX_FLUSH)) == 0 &&
+ (ch->ch_send & RR_RX_FLUSH) == 0) {
+
+ if (ch->ch_rin + dlen >= RBUF_MAX) {
+ n = RBUF_MAX - ch->ch_rin;
+
+ memcpy(ch->ch_rbuf + ch->ch_rin, dbuf, n);
+
+ ch->ch_rin = 0;
+ dbuf += n;
+ dlen -= n;
+ }
+
+ memcpy(ch->ch_rbuf + ch->ch_rin, dbuf, dlen);
+
+ ch->ch_rin += dlen;
+
+
+ /*
+ * If we are not in fastcook mode, or
+ * if there is a fastcook thread
+ * waiting for data, send the data to
+ * the line discipline.
+ */
+
+ if ((ch->ch_flag & CH_FAST_READ) == 0 ||
+ ch->ch_inwait != 0) {
+ dgrp_input(ch);
+ }
+
+ /*
+ * If there is a read thread waiting
+ * in select, and we are in fastcook
+ * mode, wake him up.
+ */
+
+ if (waitqueue_active(&ch->ch_tun.un_tty->read_wait) &&
+ (ch->ch_flag & CH_FAST_READ) != 0)
+ wake_up_interruptible(&ch->ch_tun.un_tty->read_wait);
+
+ /*
+ * Wake any thread waiting in the
+ * fastcook loop.
+ */
+
+ if ((ch->ch_flag & CH_INPUT) != 0) {
+ ch->ch_flag &= ~CH_INPUT;
+
+ wake_up_interruptible(&ch->ch_flag_wait);
+ }
+ }
+
+ /*
+ * Fabricate and insert a data packet header to
+ * preceed the remaining data when it comes in.
+ */
+
+ if (remain < plen) {
+ dlen = plen - remain;
+ b = buf;
+
+ b[0] = 0x90 + n1;
+ put_unaligned_be16(dlen, b + 1);
+
+ remain = 3;
+ goto done;
+ }
+ break;
+
+ /*
+ * Handle Window Sequence packets.
+ */
+
+ case 10:
+ plen = 3;
+ if (remain < plen)
+ goto done;
+
+ nd->nd_tx_work = 1;
+
+ {
+ ushort tpos = get_unaligned_be16(b + 1);
+
+ ushort ack = (tpos - ch->ch_s_tpos) & 0xffff;
+ ushort unack = (ch->ch_s_tin - ch->ch_s_tpos) & 0xffff;
+ ushort notify = (ch->ch_s_treq - ch->ch_s_tpos) & 0xffff;
+
+ if (ch->ch_state < CS_READY || ack > unack) {
+ error = "Improper Window Sequence";
+ goto prot_error;
+ }
+
+ ch->ch_s_tpos = tpos;
+
+ if (notify <= ack)
+ ch->ch_s_treq = tpos;
+ }
+ break;
+
+ /*
+ * Handle Command response packets.
+ */
+
+ case 11:
+
+ /*
+ * RealPort engine fix - 03/11/2004
+ *
+ * This check did not used to be here.
+ *
+ * We were using b[1] without verifying that the data
+ * is actually there and valid. On a split packet, it
+ * might not be yet.
+ *
+ * NOTE: I have never actually seen the failure happen
+ * under Linux, but since I have seen it occur
+ * under both Solaris and HP-UX, the assumption
+ * is that it *could* happen here as well...
+ */
+ if (remain < 2)
+ goto done;
+
+
+ switch (b[1]) {
+
+ /*
+ * Handle Open Response.
+ */
+
+ case 11:
+ plen = 6;
+ if (remain < plen)
+ goto done;
+
+ nd->nd_tx_work = 1;
+
+ {
+ int req = b[2];
+ int resp = b[3];
+ port = get_unaligned_be16(b + 4);
+
+ if (port >= nd->nd_chan_count) {
+ error = "Open channel number out of range";
+ goto prot_error;
+ }
+
+ ch = nd->nd_chan + port;
+
+ /*
+ * How we handle an open response depends primarily
+ * on our current channel state.
+ */
+
+ switch (ch->ch_state) {
+ case CS_IDLE:
+
+ /*
+ * Handle a delayed open.
+ */
+
+ if (ch->ch_otype_waiting != 0 &&
+ req == ch->ch_otype_waiting &&
+ resp == 0) {
+ ch->ch_otype = req;
+ ch->ch_otype_waiting = 0;
+ ch->ch_state = CS_SEND_QUERY;
+ break;
+ }
+ goto open_error;
+
+ case CS_WAIT_OPEN:
+
+ /*
+ * Handle the open response.
+ */
+
+ if (req == ch->ch_otype) {
+ switch (resp) {
+
+ /*
+ * On successful response, open the
+ * port and proceed normally.
+ */
+
+ case 0:
+ ch->ch_state = CS_SEND_QUERY;
+ break;
+
+ /*
+ * On a busy response to a persistent open,
+ * remember that the open is pending.
+ */
+
+ case 1:
+ case 2:
+ if (req != OTYPE_IMMEDIATE) {
+ ch->ch_otype_waiting = req;
+ ch->ch_state = CS_IDLE;
+ break;
+ }
+
+ /*
+ * Otherwise the server open failed. If
+ * the Unix port is open, hang it up.
+ */
+
+ default:
+ if (ch->ch_open_count != 0) {
+ ch->ch_flag |= CH_HANGUP;
+ dgrp_carrier(ch);
+ ch->ch_state = CS_IDLE;
+ break;
+ }
+
+ ch->ch_open_error = resp;
+ ch->ch_state = CS_IDLE;
+
+ wake_up_interruptible(&ch->ch_flag_wait);
+ }
+ break;
+ }
+
+ /*
+ * Handle delayed response arrival preceeding
+ * the open response we are waiting for.
+ */
+
+ if (ch->ch_otype_waiting != 0 &&
+ req == ch->ch_otype_waiting &&
+ resp == 0) {
+ ch->ch_otype = ch->ch_otype_waiting;
+ ch->ch_otype_waiting = 0;
+ ch->ch_state = CS_WAIT_FAIL;
+ break;
+ }
+ goto open_error;
+
+
+ case CS_WAIT_FAIL:
+
+ /*
+ * Handle response to immediate open arriving
+ * after a delayed open success.
+ */
+
+ if (req == OTYPE_IMMEDIATE) {
+ ch->ch_state = CS_SEND_QUERY;
+ break;
+ }
+ goto open_error;
+
+
+ case CS_WAIT_CANCEL:
+ /*
+ * Handle delayed open response arriving before
+ * the cancel response.
+ */
+
+ if (req == ch->ch_otype_waiting &&
+ resp == 0) {
+ ch->ch_otype_waiting = 0;
+ break;
+ }
+
+ /*
+ * Handle cancel response.
+ */
+
+ if (req == 4 && resp == 0) {
+ ch->ch_otype_waiting = 0;
+ ch->ch_state = CS_IDLE;
+ break;
+ }
+ goto open_error;
+
+
+ case CS_WAIT_CLOSE:
+ /*
+ * Handle a successful response to a port
+ * close.
+ */
+
+ if (req >= 3) {
+ ch->ch_state = CS_IDLE;
+ break;
+ }
+ goto open_error;
+
+open_error:
+ default:
+ {
+ error = "Improper Open Response";
+ goto prot_error;
+ }
+ }
+ }
+ break;
+
+ /*
+ * Handle Synchronize Response.
+ */
+
+ case 13:
+ plen = 3;
+ if (remain < plen)
+ goto done;
+ {
+ int seq = b[2];
+ int s;
+
+ /*
+ * If channel was waiting for this sync response,
+ * unset the flag, and wake up anyone waiting
+ * on the event.
+ */
+ if (ch->ch_flag & CH_WAITING_SYNC) {
+ ch->ch_flag &= ~(CH_WAITING_SYNC);
+ wake_up_interruptible(&ch->ch_flag_wait);
+ }
+
+ if (((seq - nd->nd_seq_out) & SEQ_MASK) >=
+ ((nd->nd_seq_in - nd->nd_seq_out) & SEQ_MASK)) {
+ break;
+ }
+
+ for (s = nd->nd_seq_out;; s = (s + 1) & SEQ_MASK) {
+ if (nd->nd_seq_wait[s] != 0) {
+ nd->nd_seq_wait[s] = 0;
+
+ wake_up_interruptible(&nd->nd_seq_wque[s]);
+ }
+
+ nd->nd_unack -= nd->nd_seq_size[s];
+
+ if (s == seq)
+ break;
+ }
+
+ nd->nd_seq_out = (seq + 1) & SEQ_MASK;
+ }
+ break;
+
+ /*
+ * Handle Sequence Response.
+ */
+
+ case 15:
+ plen = 6;
+ if (remain < plen)
+ goto done;
+
+ {
+ /* Record that we have received the Sequence
+ * Response, but we aren't interested in the
+ * sequence numbers. We were using RIN like it
+ * was ROUT and that was causing problems,
+ * fixed 7-13-2001 David Fries. See comment in
+ * drp.h for ch_s_rin variable.
+ int rin = get_unaligned_be16(b + 2);
+ int tpos = get_unaligned_be16(b + 4);
+ */
+
+ ch->ch_send &= ~RR_SEQUENCE;
+ ch->ch_expect &= ~RR_SEQUENCE;
+ }
+ goto check_query;
+
+ /*
+ * Handle Status Response.
+ */
+
+ case 17:
+ plen = 5;
+ if (remain < plen)
+ goto done;
+
+ {
+ ch->ch_s_elast = get_unaligned_be16(b + 2);
+ ch->ch_s_mlast = b[4];
+
+ ch->ch_expect &= ~RR_STATUS;
+ ch->ch_send &= ~RR_STATUS;
+
+ /*
+ * CH_PHYS_CD is cleared because something _could_ be
+ * waiting for the initial sense of carrier... and if
+ * carrier is high immediately, we want to be sure to
+ * wake them as soon as possible.
+ */
+ ch->ch_flag &= ~CH_PHYS_CD;
+
+ dgrp_carrier(ch);
+ }
+ goto check_query;
+
+ /*
+ * Handle Line Error Response.
+ */
+
+ case 19:
+ plen = 14;
+ if (remain < plen)
+ goto done;
+
+ break;
+
+ /*
+ * Handle Buffer Response.
+ */
+
+ case 21:
+ plen = 6;
+ if (remain < plen)
+ goto done;
+
+ {
+ ch->ch_s_rsize = get_unaligned_be16(b + 2);
+ ch->ch_s_tsize = get_unaligned_be16(b + 4);
+
+ ch->ch_send &= ~RR_BUFFER;
+ ch->ch_expect &= ~RR_BUFFER;
+ }
+ goto check_query;
+
+ /*
+ * Handle Port Capability Response.
+ */
+
+ case 23:
+ plen = 32;
+ if (remain < plen)
+ goto done;
+
+ {
+ ch->ch_send &= ~RR_CAPABILITY;
+ ch->ch_expect &= ~RR_CAPABILITY;
+ }
+
+ /*
+ * When all queries are complete, set those parameters
+ * derived from the query results, then transition
+ * to the READY state.
+ */
+
+check_query:
+ if (ch->ch_state == CS_WAIT_QUERY &&
+ (ch->ch_expect & (RR_SEQUENCE |
+ RR_STATUS |
+ RR_BUFFER |
+ RR_CAPABILITY)) == 0) {
+ ch->ch_tmax = ch->ch_s_tsize / 4;
+
+ if (ch->ch_edelay == DGRP_TTIME)
+ ch->ch_ttime = DGRP_TTIME;
+ else
+ ch->ch_ttime = ch->ch_edelay;
+
+ ch->ch_rmax = ch->ch_s_rsize / 4;
+
+ if (ch->ch_edelay == DGRP_RTIME)
+ ch->ch_rtime = DGRP_RTIME;
+ else
+ ch->ch_rtime = ch->ch_edelay;
+
+ ch->ch_rlow = 2 * ch->ch_s_rsize / 8;
+ ch->ch_rhigh = 6 * ch->ch_s_rsize / 8;
+
+ ch->ch_state = CS_READY;
+
+ nd->nd_tx_work = 1;
+ wake_up_interruptible(&ch->ch_flag_wait);
+
+ }
+ break;
+
+ default:
+ goto decode_error;
+ }
+ break;
+
+ /*
+ * Handle Events.
+ */
+
+ case 12:
+ plen = 4;
+ if (remain < plen)
+ goto done;
+
+ mlast = ch->ch_s_mlast;
+ elast = ch->ch_s_elast;
+
+ mstat = ch->ch_s_mlast = b[1];
+ estat = ch->ch_s_elast = get_unaligned_be16(b + 2);
+
+ /*
+ * Handle modem changes.
+ */
+
+ if (((mstat ^ mlast) & DM_CD) != 0)
+ dgrp_carrier(ch);
+
+
+ /*
+ * Handle received break.
+ */
+
+ if ((estat & ~elast & EV_RXB) != 0 &&
+ (ch->ch_tun.un_open_count != 0) &&
+ I_BRKINT(ch->ch_tun.un_tty) &&
+ !(I_IGNBRK(ch->ch_tun.un_tty))) {
+
+ tty_buffer_request_room(ch->ch_tun.un_tty, 1);
+ tty_insert_flip_char(ch->ch_tun.un_tty, 0, TTY_BREAK);
+ tty_flip_buffer_push(ch->ch_tun.un_tty);
+
+ }
+
+ /*
+ * On transmit break complete, if more break traffic
+ * is waiting then send it. Otherwise wake any threads
+ * waiting for transmitter empty.
+ */
+
+ if ((~estat & elast & EV_TXB) != 0 &&
+ (ch->ch_expect & RR_TX_BREAK) != 0) {
+
+ nd->nd_tx_work = 1;
+
+ ch->ch_expect &= ~RR_TX_BREAK;
+
+ if (ch->ch_break_time != 0) {
+ ch->ch_send |= RR_TX_BREAK;
+ } else {
+ ch->ch_send &= ~RR_TX_BREAK;
+ ch->ch_flag &= ~CH_TX_BREAK;
+ wake_up_interruptible(&ch->ch_flag_wait);
+ }
+ }
+ break;
+
+ case 13:
+ case 14:
+ error = "Unrecognized command";
+ goto prot_error;
+
+ /*
+ * Decode Special Codes.
+ */
+
+ case 15:
+ switch (n1) {
+ /*
+ * One byte module select.
+ */
+
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ case 5:
+ case 6:
+ case 7:
+ plen = 1;
+ nd->nd_rx_module = n1;
+ break;
+
+ /*
+ * Two byte module select.
+ */
+
+ case 8:
+ plen = 2;
+ if (remain < plen)
+ goto done;
+
+ nd->nd_rx_module = b[1];
+ break;
+
+ /*
+ * ID Request packet.
+ */
+
+ case 11:
+ if (remain < 4)
+ goto done;
+
+ plen = get_unaligned_be16(b + 2);
+
+ if (plen < 12 || plen > 1000) {
+ error = "Response Packet length error";
+ goto prot_error;
+ }
+
+ nd->nd_tx_work = 1;
+
+ switch (b[1]) {
+ /*
+ * Echo packet.
+ */
+
+ case 0:
+ nd->nd_send |= NR_ECHO;
+ break;
+
+ /*
+ * ID Response packet.
+ */
+
+ case 1:
+ nd->nd_send |= NR_IDENT;
+ break;
+
+ /*
+ * ID Response packet.
+ */
+
+ case 32:
+ nd->nd_send |= NR_PASSWORD;
+ break;
+
+ }
+ break;
+
+ /*
+ * Various node-level response packets.
+ */
+
+ case 12:
+ if (remain < 4)
+ goto done;
+
+ plen = get_unaligned_be16(b + 2);
+
+ if (plen < 4 || plen > 1000) {
+ error = "Response Packet length error";
+ goto prot_error;
+ }
+
+ nd->nd_tx_work = 1;
+
+ switch (b[1]) {
+ /*
+ * Echo packet.
+ */
+
+ case 0:
+ nd->nd_expect &= ~NR_ECHO;
+ break;
+
+ /*
+ * Product Response Packet.
+ */
+
+ case 1:
+ {
+ int desclen;
+
+ nd->nd_hw_ver = (b[8] << 8) | b[9];
+ nd->nd_sw_ver = (b[10] << 8) | b[11];
+ nd->nd_hw_id = b[6];
+ desclen = ((plen - 12) > MAX_DESC_LEN) ? MAX_DESC_LEN :
+ plen - 12;
+ strncpy(nd->nd_ps_desc, b + 12, desclen);
+ nd->nd_ps_desc[desclen] = 0;
+ }
+
+ nd->nd_expect &= ~NR_IDENT;
+ break;
+
+ /*
+ * Capability Response Packet.
+ */
+
+ case 2:
+ {
+ int nn = get_unaligned_be16(b + 4);
+
+ if (nn > CHAN_MAX)
+ nn = CHAN_MAX;
+
+ dgrp_chan_count(nd, nn);
+ }
+
+ nd->nd_expect &= ~NR_CAPABILITY;
+ break;
+
+ /*
+ * VPD Response Packet.
+ */
+
+ case 15:
+ /*
+ * NOTE: case 15 is here ONLY because the EtherLite
+ * is broken, and sends a response to 24 back as 15.
+ * To resolve this, the EtherLite firmware is now
+ * fixed to send back 24 correctly, but, for backwards
+ * compatibility, we now have reserved 15 for the
+ * bad EtherLite response to 24 as well.
+ */
+
+ /* Fallthru! */
+
+ case 24:
+
+ /*
+ * If the product doesn't support VPD,
+ * it will send back a null IDRESP,
+ * which is a length of 4 bytes.
+ */
+ if (plen > 4) {
+ memcpy(nd->nd_vpd, b + 4, min(plen - 4, (long) VPDSIZE));
+ nd->nd_vpd_len = min(plen - 4, (long) VPDSIZE);
+ }
+
+ nd->nd_expect &= ~NR_VPD;
+ break;
+
+ default:
+ goto decode_error;
+ }
+
+ if (nd->nd_expect == 0 &&
+ nd->nd_state == NS_WAIT_QUERY) {
+ nd->nd_state = NS_READY;
+ }
+ break;
+
+ /*
+ * Debug packet.
+ */
+
+ case 14:
+ if (remain < 4)
+ goto done;
+
+ plen = get_unaligned_be16(b + 2) + 4;
+
+ if (plen > 1000) {
+ error = "Debug Packet too large";
+ goto prot_error;
+ }
+
+ if (remain < plen)
+ goto done;
+ break;
+
+ /*
+ * Handle reset packet.
+ */
+
+ case 15:
+ if (remain < 2)
+ goto done;
+
+ plen = 2 + b[1];
+
+ if (remain < plen)
+ goto done;
+
+ nd->nd_tx_work = 1;
+
+ n = b[plen];
+ b[plen] = 0;
+
+ b[plen] = n;
+
+ error = "Client Reset Acknowledge";
+ goto prot_error;
+
+ default:
+ goto decode_error;
+ }
+ break;
+
+ default:
+ goto decode_error;
+ }
+
+ b += plen;
+ remain -= plen;
+ }
+
+ /*
+ * When the buffer is exhausted, copy any data left at the
+ * top of the buffer back down to the bottom for the next
+ * read request.
+ */
+
+done:
+ if (remain > 0 && b != buf)
+ memcpy(buf, b, remain);
+
+ nd->nd_remain = remain;
+ return;
+
+/*
+ * Handle a decode error.
+ */
+
+decode_error:
+ error = "Protocol decode error";
+
+/*
+ * Handle a general protocol error.
+ */
+
+prot_error:
+ nd->nd_remain = 0;
+ nd->nd_state = NS_SEND_ERROR;
+ nd->nd_error = error;
+}
+
+/*
+ * dgrp_net_write() -- write data to the network device.
+ *
+ * A zero byte write indicates that the connection to the RealPort
+ * device has been broken.
+ *
+ * A non-zero write indicates data from the RealPort device.
+ */
+static ssize_t dgrp_net_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct nd_struct *nd;
+ ssize_t rtn = 0;
+ long n;
+ long total = 0;
+
+ /*
+ * Get the node pointer, and quit if it doesn't exist.
+ */
+ nd = (struct nd_struct *)(file->private_data);
+ if (!nd)
+ return -ENXIO;
+
+ /*
+ * Grab the NET lock.
+ */
+ down(&nd->nd_net_semaphore);
+
+ nd->nd_write_count++;
+
+ /*
+ * Handle disconnect.
+ */
+
+ if (count == 0) {
+ dgrp_net_idle(nd);
+ /*
+ * Set the active port count to zero.
+ */
+ dgrp_chan_count(nd, 0);
+ goto unlock;
+ }
+
+ /*
+ * Loop to process entire receive packet.
+ */
+
+ while (count > 0) {
+ n = UIO_MAX - nd->nd_remain;
+
+ if (n > count)
+ n = count;
+
+ nd->nd_rx_byte += n + nd->nd_link.lk_header_size;
+
+ rtn = copy_from_user(nd->nd_iobuf + nd->nd_remain,
+ (void __user *) buf + total, n);
+ if (rtn) {
+ rtn = -EFAULT;
+ goto unlock;
+ }
+
+ *ppos += n;
+
+ total += n;
+
+ count -= n;
+
+ if (nd->nd_mon_buf)
+ dgrp_monitor_data(nd, RPDUMP_SERVER,
+ nd->nd_iobuf + nd->nd_remain, n);
+
+ nd->nd_remain += n;
+
+ dgrp_receive(nd);
+ }
+
+ rtn = total;
+
+unlock:
+ /*
+ * Release the NET lock.
+ */
+ up(&nd->nd_net_semaphore);
+
+ return rtn;
+}
+
+
+/*
+ * dgrp_net_select()
+ * Determine whether a device is ready to be read or written to, and
+ * sleep if not.
+ */
+static unsigned int dgrp_net_select(struct file *file,
+ struct poll_table_struct *table)
+{
+ unsigned int retval = 0;
+ struct nd_struct *nd = file->private_data;
+
+ poll_wait(file, &nd->nd_tx_waitq, table);
+
+ if (nd->nd_tx_ready)
+ retval |= POLLIN | POLLRDNORM; /* Conditionally readable */
+
+ retval |= POLLOUT | POLLWRNORM; /* Always writeable */
+
+ return retval;
+}
+
+/*
+ * dgrp_net_ioctl
+ *
+ * Implement those functions which allow the network daemon to control
+ * the network parameters in the driver. The ioctls include ones to
+ * get and set the link speed parameters for the PortServer.
+ */
+static long dgrp_net_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct nd_struct *nd;
+ int rtn = 0;
+ long size = _IOC_SIZE(cmd);
+ struct link_struct link;
+
+ nd = file->private_data;
+
+ if (_IOC_DIR(cmd) & _IOC_READ)
+ rtn = access_ok(VERIFY_WRITE, (void __user *) arg, size);
+ else if (_IOC_DIR(cmd) & _IOC_WRITE)
+ rtn = access_ok(VERIFY_READ, (void __user *) arg, size);
+
+ if (!rtn)
+ return rtn;
+
+ switch (cmd) {
+ case DIGI_SETLINK:
+ if (size != sizeof(struct link_struct))
+ return -EINVAL;
+
+ if (copy_from_user((void *)(&link), (void __user *) arg, size))
+ return -EFAULT;
+
+ if (link.lk_fast_rate < 9600)
+ link.lk_fast_rate = 9600;
+
+ if (link.lk_slow_rate < 2400)
+ link.lk_slow_rate = 2400;
+
+ if (link.lk_fast_rate > 10000000)
+ link.lk_fast_rate = 10000000;
+
+ if (link.lk_slow_rate > link.lk_fast_rate)
+ link.lk_slow_rate = link.lk_fast_rate;
+
+ if (link.lk_fast_delay > 2000)
+ link.lk_fast_delay = 2000;
+
+ if (link.lk_slow_delay > 10000)
+ link.lk_slow_delay = 10000;
+
+ if (link.lk_fast_delay < 60)
+ link.lk_fast_delay = 60;
+
+ if (link.lk_slow_delay < link.lk_fast_delay)
+ link.lk_slow_delay = link.lk_fast_delay;
+
+ if (link.lk_header_size < 2)
+ link.lk_header_size = 2;
+
+ if (link.lk_header_size > 128)
+ link.lk_header_size = 128;
+
+ link.lk_fast_rate /= 8 * 1000 / dgrp_poll_tick;
+ link.lk_slow_rate /= 8 * 1000 / dgrp_poll_tick;
+
+ link.lk_fast_delay /= dgrp_poll_tick;
+ link.lk_slow_delay /= dgrp_poll_tick;
+
+ nd->nd_link = link;
+
+ break;
+
+ case DIGI_GETLINK:
+ if (size != sizeof(struct link_struct))
+ return -EINVAL;
+
+ if (copy_to_user((void __user *)arg, (void *)(&nd->nd_link),
+ size))
+ return -EFAULT;
+
+ break;
+
+ default:
+ return -EINVAL;
+
+ }
+
+ return 0;
+}
+
+/**
+ * dgrp_poll_handler() -- handler for poll timer
+ *
+ * As each timer expires, it determines (a) whether the "transmit"
+ * waiter needs to be woken up, and (b) whether the poller needs to
+ * be rescheduled.
+ */
+void dgrp_poll_handler(unsigned long arg)
+{
+ struct dgrp_poll_data *poll_data;
+ struct nd_struct *nd;
+ struct link_struct *lk;
+ ulong time;
+ ulong poll_time;
+ ulong freq;
+ ulong lock_flags;
+
+ poll_data = (struct dgrp_poll_data *) arg;
+ freq = 1000 / poll_data->poll_tick;
+ poll_data->poll_round += 17;
+
+ if (poll_data->poll_round >= freq)
+ poll_data->poll_round -= freq;
+
+ /*
+ * Loop to process all open nodes.
+ *
+ * For each node, determine the rate at which it should
+ * be transmitting data. Then if the node should wake up
+ * and transmit data now, enable the net receive select
+ * to get the transmit going.
+ */
+
+ list_for_each_entry(nd, &nd_struct_list, list) {
+
+ lk = &nd->nd_link;
+
+ /*
+ * Decrement statistics. These are only for use with
+ * KME, so don't worry that the operations are done
+ * unlocked, and so the results are occassionally wrong.
+ */
+
+ nd->nd_read_count -= (nd->nd_read_count +
+ poll_data->poll_round) / freq;
+ nd->nd_write_count -= (nd->nd_write_count +
+ poll_data->poll_round) / freq;
+ nd->nd_send_count -= (nd->nd_send_count +
+ poll_data->poll_round) / freq;
+ nd->nd_tx_byte -= (nd->nd_tx_byte +
+ poll_data->poll_round) / freq;
+ nd->nd_rx_byte -= (nd->nd_rx_byte +
+ poll_data->poll_round) / freq;
+
+ /*
+ * Wake the daemon to transmit data only when there is
+ * enough byte credit to send data.
+ *
+ * The results are approximate because the operations
+ * are performed unlocked, and we are inspecting
+ * data asynchronously updated elsewhere. The whole
+ * thing is just approximation anyway, so that should
+ * be okay.
+ */
+
+ if (lk->lk_slow_rate >= UIO_MAX) {
+
+ nd->nd_delay = 0;
+ nd->nd_rate = UIO_MAX;
+
+ nd->nd_tx_deposit = nd->nd_tx_charge + 3 * UIO_MAX;
+ nd->nd_tx_credit = 3 * UIO_MAX;
+
+ } else {
+
+ long rate;
+ long delay;
+ long deposit;
+ long charge;
+ long size;
+ long excess;
+
+ long seq_in = nd->nd_seq_in;
+ long seq_out = nd->nd_seq_out;
+
+ /*
+ * If there are no outstanding packets, run at the
+ * fastest rate.
+ */
+
+ if (seq_in == seq_out) {
+ delay = 0;
+ rate = lk->lk_fast_rate;
+ }
+
+ /*
+ * Otherwise compute the transmit rate based on the
+ * delay since the oldest packet.
+ */
+
+ else {
+ /*
+ * The actual delay is computed as the
+ * time since the oldest unacknowledged
+ * packet was sent, minus the time it
+ * took to send that packet to the server.
+ */
+
+ delay = ((jiffies - nd->nd_seq_time[seq_out])
+ - (nd->nd_seq_size[seq_out] /
+ lk->lk_fast_rate));
+
+ /*
+ * If the delay is less than the "fast"
+ * delay, transmit full speed. If greater
+ * than the "slow" delay, transmit at the
+ * "slow" speed. In between, interpolate
+ * between the fast and slow speeds.
+ */
+
+ rate =
+ (delay <= lk->lk_fast_delay ?
+ lk->lk_fast_rate :
+ delay >= lk->lk_slow_delay ?
+ lk->lk_slow_rate :
+ (lk->lk_slow_rate +
+ (lk->lk_slow_delay - delay) *
+ (lk->lk_fast_rate - lk->lk_slow_rate) /
+ (lk->lk_slow_delay - lk->lk_fast_delay)
+ )
+ );
+ }
+
+ nd->nd_delay = delay;
+ nd->nd_rate = rate;
+
+ /*
+ * Increase the transmit credit by depositing the
+ * current transmit rate.
+ */
+
+ deposit = nd->nd_tx_deposit;
+ charge = nd->nd_tx_charge;
+
+ deposit += rate;
+
+ /*
+ * If the available transmit credit becomes too large,
+ * reduce the deposit to correct the value.
+ *
+ * Too large is the max of:
+ * 6 times the header size
+ * 3 times the current transmit rate.
+ */
+
+ size = 2 * nd->nd_link.lk_header_size;
+
+ if (size < rate)
+ size = rate;
+
+ size *= 3;
+
+ excess = deposit - charge - size;
+
+ if (excess > 0)
+ deposit -= excess;
+
+ nd->nd_tx_deposit = deposit;
+ nd->nd_tx_credit = deposit - charge;
+
+ /*
+ * Wake the transmit task only if the transmit credit
+ * is at least 3 times the transmit header size.
+ */
+
+ size = 3 * lk->lk_header_size;
+
+ if (nd->nd_tx_credit < size)
+ continue;
+ }
+
+
+ /*
+ * Enable the READ select to wake the daemon if there
+ * is useful work for the drp_read routine to perform.
+ */
+
+ if (waitqueue_active(&nd->nd_tx_waitq) &&
+ (nd->nd_tx_work != 0 ||
+ (ulong)(jiffies - nd->nd_tx_time) >= IDLE_MAX)) {
+ nd->nd_tx_ready = 1;
+
+ wake_up_interruptible(&nd->nd_tx_waitq);
+
+ /* not needed */
+ /* nd->nd_flag &= ~ND_SELECT; */
+ }
+ }
+
+
+ /*
+ * Schedule ourself back at the nominal wakeup interval.
+ */
+ spin_lock_irqsave(&poll_data->poll_lock, lock_flags);
+
+ poll_data->node_active_count--;
+ if (poll_data->node_active_count > 0) {
+ poll_data->node_active_count++;
+ poll_time = poll_data->timer.expires +
+ poll_data->poll_tick * HZ / 1000;
+
+ time = poll_time - jiffies;
+
+ if (time >= 2 * poll_data->poll_tick)
+ poll_time = jiffies + dgrp_poll_tick * HZ / 1000;
+
+ poll_data->timer.expires = poll_time;
+ add_timer(&poll_data->timer);
+ }
+
+ spin_unlock_irqrestore(&poll_data->poll_lock, lock_flags);
+}
--- /dev/null
+/*
+ *
+ * Copyright 1999-2000 Digi International (www.digi.com)
+ * James Puzzo <jamesp at digi dot com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/*
+ *
+ * Filename:
+ *
+ * dgrp_ports_ops.c
+ *
+ * Description:
+ *
+ * Handle the file operations required for the /proc/dgrp/ports/...
+ * devices. Basically gathers tty status for the node and returns it.
+ *
+ * Author:
+ *
+ * James A. Puzzo
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/tty.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+
+#include "dgrp_common.h"
+
+/* File operation declarations */
+static int dgrp_ports_open(struct inode *, struct file *);
+
+static const struct file_operations ports_ops = {
+ .owner = THIS_MODULE,
+ .open = dgrp_ports_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release
+};
+
+static struct inode_operations ports_inode_ops = {
+ .permission = dgrp_inode_permission
+};
+
+
+void dgrp_register_ports_hook(struct proc_dir_entry *de)
+{
+ struct nd_struct *node = de->data;
+
+ de->proc_iops = &ports_inode_ops;
+ de->proc_fops = &ports_ops;
+ node->nd_ports_de = de;
+}
+
+static void *dgrp_ports_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ if (*pos == 0)
+ seq_puts(seq, "#num tty_open pr_open tot_wait MSTAT IFLAG OFLAG CFLAG BPS DIGIFLAGS\n");
+
+ return pos;
+}
+
+static void *dgrp_ports_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct nd_struct *nd = seq->private;
+
+ if (*pos >= nd->nd_chan_count)
+ return NULL;
+
+ *pos += 1;
+
+ return pos;
+}
+
+static void dgrp_ports_seq_stop(struct seq_file *seq, void *v)
+{
+}
+
+static int dgrp_ports_seq_show(struct seq_file *seq, void *v)
+{
+ loff_t *pos = v;
+ struct nd_struct *nd;
+ struct ch_struct *ch;
+ struct un_struct *tun, *pun;
+ unsigned int totcnt;
+
+ nd = seq->private;
+ if (!nd)
+ return 0;
+
+ if (*pos >= nd->nd_chan_count)
+ return 0;
+
+ ch = &nd->nd_chan[*pos];
+ tun = &ch->ch_tun;
+ pun = &ch->ch_pun;
+
+ /*
+ * If port is not open and no one is waiting to
+ * open it, the modem signal values can't be
+ * trusted, and will be zeroed.
+ */
+ totcnt = tun->un_open_count +
+ pun->un_open_count +
+ ch->ch_wait_count[0] +
+ ch->ch_wait_count[1] +
+ ch->ch_wait_count[2];
+
+ seq_printf(seq, "%02d %02d %02d %02d 0x%04X 0x%04X 0x%04X 0x%04X %-6d 0x%04X\n",
+ (int) *pos,
+ tun->un_open_count,
+ pun->un_open_count,
+ ch->ch_wait_count[0] +
+ ch->ch_wait_count[1] +
+ ch->ch_wait_count[2],
+ (totcnt ? ch->ch_s_mlast : 0),
+ ch->ch_s_iflag,
+ ch->ch_s_oflag,
+ ch->ch_s_cflag,
+ (ch->ch_s_brate ? (1843200 / ch->ch_s_brate) : 0),
+ ch->ch_digi.digi_flags);
+
+ return 0;
+}
+
+static const struct seq_operations ports_seq_ops = {
+ .start = dgrp_ports_seq_start,
+ .next = dgrp_ports_seq_next,
+ .stop = dgrp_ports_seq_stop,
+ .show = dgrp_ports_seq_show,
+};
+
+/**
+ * dgrp_ports_open -- open the /proc/dgrp/ports/... device
+ * @inode: struct inode *
+ * @file: struct file *
+ *
+ * Open function to open the /proc/dgrp/ports device for a PortServer.
+ * This is the open function for struct file_operations
+ */
+static int dgrp_ports_open(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq;
+ int rtn;
+
+ rtn = seq_open(file, &ports_seq_ops);
+ if (!rtn) {
+ seq = file->private_data;
+ seq->private = PDE(inode)->data;
+ }
+
+ return rtn;
+}
--- /dev/null
+/*
+ *
+ * Copyright 1999 Digi International (www.digi.com)
+ * James Puzzo <jamesp at digi dot com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ */
+
+/*
+ *
+ * Filename:
+ *
+ * dgrp_specproc.c
+ *
+ * Description:
+ *
+ * Handle the "config" proc entry for the linux realport device driver
+ * and provide slots for the "net" and "mon" devices
+ *
+ * Author:
+ *
+ * James A. Puzzo
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/sched.h>
+#include <linux/cred.h>
+#include <linux/proc_fs.h>
+#include <linux/ctype.h>
+#include <linux/seq_file.h>
+
+#include "dgrp_common.h"
+
+static struct dgrp_proc_entry dgrp_table[];
+static struct proc_dir_entry *dgrp_proc_dir_entry;
+
+static int dgrp_add_id(long id);
+static int dgrp_remove_nd(struct nd_struct *nd);
+static void unregister_dgrp_device(struct proc_dir_entry *de);
+static void register_dgrp_device(struct nd_struct *node,
+ struct proc_dir_entry *root,
+ void (*register_hook)(struct proc_dir_entry *de));
+
+/* File operation declarations */
+static int dgrp_gen_proc_open(struct inode *, struct file *);
+static int dgrp_gen_proc_close(struct inode *, struct file *);
+static int parse_write_config(char *);
+
+
+static const struct file_operations dgrp_proc_file_ops = {
+ .owner = THIS_MODULE,
+ .open = dgrp_gen_proc_open,
+ .release = dgrp_gen_proc_close,
+};
+
+static struct inode_operations proc_inode_ops = {
+ .permission = dgrp_inode_permission
+};
+
+
+static void register_proc_table(struct dgrp_proc_entry *,
+ struct proc_dir_entry *);
+static void unregister_proc_table(struct dgrp_proc_entry *,
+ struct proc_dir_entry *);
+
+static struct dgrp_proc_entry dgrp_net_table[];
+static struct dgrp_proc_entry dgrp_mon_table[];
+static struct dgrp_proc_entry dgrp_ports_table[];
+static struct dgrp_proc_entry dgrp_dpa_table[];
+
+static ssize_t config_proc_write(struct file *file, const char __user *buffer,
+ size_t count, loff_t *pos);
+
+static int nodeinfo_proc_open(struct inode *inode, struct file *file);
+static int info_proc_open(struct inode *inode, struct file *file);
+static int config_proc_open(struct inode *inode, struct file *file);
+
+static struct file_operations config_proc_file_ops = {
+ .owner = THIS_MODULE,
+ .open = config_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+ .write = config_proc_write
+};
+
+static struct file_operations info_proc_file_ops = {
+ .owner = THIS_MODULE,
+ .open = info_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static struct file_operations nodeinfo_proc_file_ops = {
+ .owner = THIS_MODULE,
+ .open = nodeinfo_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static struct dgrp_proc_entry dgrp_table[] = {
+ {
+ .id = DGRP_CONFIG,
+ .name = "config",
+ .mode = 0644,
+ .proc_file_ops = &config_proc_file_ops,
+ },
+ {
+ .id = DGRP_INFO,
+ .name = "info",
+ .mode = 0644,
+ .proc_file_ops = &info_proc_file_ops,
+ },
+ {
+ .id = DGRP_NODEINFO,
+ .name = "nodeinfo",
+ .mode = 0644,
+ .proc_file_ops = &nodeinfo_proc_file_ops,
+ },
+ {
+ .id = DGRP_NETDIR,
+ .name = "net",
+ .mode = 0500,
+ .child = dgrp_net_table
+ },
+ {
+ .id = DGRP_MONDIR,
+ .name = "mon",
+ .mode = 0500,
+ .child = dgrp_mon_table
+ },
+ {
+ .id = DGRP_PORTSDIR,
+ .name = "ports",
+ .mode = 0500,
+ .child = dgrp_ports_table
+ },
+ {
+ .id = DGRP_DPADIR,
+ .name = "dpa",
+ .mode = 0500,
+ .child = dgrp_dpa_table
+ }
+};
+
+static struct proc_dir_entry *net_entry_pointer;
+static struct proc_dir_entry *mon_entry_pointer;
+static struct proc_dir_entry *dpa_entry_pointer;
+static struct proc_dir_entry *ports_entry_pointer;
+
+static struct dgrp_proc_entry dgrp_net_table[] = {
+ {0}
+};
+
+static struct dgrp_proc_entry dgrp_mon_table[] = {
+ {0}
+};
+
+static struct dgrp_proc_entry dgrp_ports_table[] = {
+ {0}
+};
+
+static struct dgrp_proc_entry dgrp_dpa_table[] = {
+ {0}
+};
+
+void dgrp_unregister_proc(void)
+{
+ unregister_proc_table(dgrp_table, dgrp_proc_dir_entry);
+ net_entry_pointer = NULL;
+ mon_entry_pointer = NULL;
+ dpa_entry_pointer = NULL;
+ ports_entry_pointer = NULL;
+
+ if (dgrp_proc_dir_entry) {
+ remove_proc_entry(dgrp_proc_dir_entry->name,
+ dgrp_proc_dir_entry->parent);
+ dgrp_proc_dir_entry = NULL;
+ }
+
+}
+
+void dgrp_register_proc(void)
+{
+ /*
+ * Register /proc/dgrp
+ */
+ dgrp_proc_dir_entry = proc_create("dgrp", S_IFDIR, NULL,
+ &dgrp_proc_file_ops);
+ register_proc_table(dgrp_table, dgrp_proc_dir_entry);
+}
+
+/*
+ * /proc/sys support
+ */
+static int dgrp_proc_match(int len, const char *name, struct proc_dir_entry *de)
+{
+ if (!de || !de->low_ino)
+ return 0;
+ if (de->namelen != len)
+ return 0;
+ return !memcmp(name, de->name, len);
+}
+
+
+/*
+ * Scan the entries in table and add them all to /proc at the position
+ * referred to by "root"
+ */
+static void register_proc_table(struct dgrp_proc_entry *table,
+ struct proc_dir_entry *root)
+{
+ struct proc_dir_entry *de;
+ int len;
+ mode_t mode;
+
+ for (; table->id; table++) {
+ /* Can't do anything without a proc name. */
+ if (!table->name)
+ continue;
+
+ /* Maybe we can't do anything with it... */
+ if (!table->proc_file_ops &&
+ !table->child) {
+ pr_warn("dgrp: Can't register %s\n",
+ table->name);
+ continue;
+ }
+
+ len = strlen(table->name);
+ mode = table->mode;
+
+ de = NULL;
+ if (!table->child)
+ mode |= S_IFREG;
+ else {
+ mode |= S_IFDIR;
+ for (de = root->subdir; de; de = de->next) {
+ if (dgrp_proc_match(len, table->name, de))
+ break;
+ }
+ /* If the subdir exists already, de is non-NULL */
+ }
+
+ if (!de) {
+ de = create_proc_entry(table->name, mode, root);
+ if (!de)
+ continue;
+ de->data = (void *) table;
+ if (!table->child) {
+ de->proc_iops = &proc_inode_ops;
+ if (table->proc_file_ops)
+ de->proc_fops = table->proc_file_ops;
+ else
+ de->proc_fops = &dgrp_proc_file_ops;
+ }
+ }
+ table->de = de;
+ if (de->mode & S_IFDIR)
+ register_proc_table(table->child, de);
+
+ if (table->id == DGRP_NETDIR)
+ net_entry_pointer = de;
+
+ if (table->id == DGRP_MONDIR)
+ mon_entry_pointer = de;
+
+ if (table->id == DGRP_DPADIR)
+ dpa_entry_pointer = de;
+
+ if (table->id == DGRP_PORTSDIR)
+ ports_entry_pointer = de;
+ }
+}
+
+/*
+ * Unregister a /proc sysctl table and any subdirectories.
+ */
+static void unregister_proc_table(struct dgrp_proc_entry *table,
+ struct proc_dir_entry *root)
+{
+ struct proc_dir_entry *de;
+ struct nd_struct *tmp;
+
+ list_for_each_entry(tmp, &nd_struct_list, list) {
+ if ((table == dgrp_net_table) && (tmp->nd_net_de)) {
+ unregister_dgrp_device(tmp->nd_net_de);
+ dgrp_remove_node_class_sysfs_files(tmp);
+ }
+
+ if ((table == dgrp_mon_table) && (tmp->nd_mon_de))
+ unregister_dgrp_device(tmp->nd_mon_de);
+
+ if ((table == dgrp_dpa_table) && (tmp->nd_dpa_de))
+ unregister_dgrp_device(tmp->nd_dpa_de);
+
+ if ((table == dgrp_ports_table) && (tmp->nd_ports_de))
+ unregister_dgrp_device(tmp->nd_ports_de);
+ }
+
+ for (; table->id; table++) {
+ de = table->de;
+
+ if (!de)
+ continue;
+ if (de->mode & S_IFDIR) {
+ if (!table->child) {
+ pr_alert("dgrp: malformed sysctl tree on free\n");
+ continue;
+ }
+ unregister_proc_table(table->child, de);
+
+ /* Don't unregister directories which still have entries */
+ if (de->subdir)
+ continue;
+ }
+
+ /* Don't unregister proc entries that are still being used.. */
+ if ((atomic_read(&de->count)) != 1) {
+ pr_alert("proc entry %s in use, not removing\n",
+ de->name);
+ continue;
+ }
+
+ remove_proc_entry(de->name, de->parent);
+ table->de = NULL;
+ }
+}
+
+static int dgrp_gen_proc_open(struct inode *inode, struct file *file)
+{
+ struct proc_dir_entry *de;
+ struct dgrp_proc_entry *entry;
+ int ret = 0;
+
+ de = (struct proc_dir_entry *) PDE(file->f_dentry->d_inode);
+ if (!de || !de->data) {
+ ret = -ENXIO;
+ goto done;
+ }
+
+ entry = (struct dgrp_proc_entry *) de->data;
+ if (!entry) {
+ ret = -ENXIO;
+ goto done;
+ }
+
+ down(&entry->excl_sem);
+
+ if (entry->excl_cnt)
+ ret = -EBUSY;
+ else
+ entry->excl_cnt++;
+
+ up(&entry->excl_sem);
+
+done:
+ return ret;
+}
+
+static int dgrp_gen_proc_close(struct inode *inode, struct file *file)
+{
+ struct proc_dir_entry *de;
+ struct dgrp_proc_entry *entry;
+
+ de = (struct proc_dir_entry *) PDE(file->f_dentry->d_inode);
+ if (!de || !de->data)
+ goto done;
+
+ entry = (struct dgrp_proc_entry *) de->data;
+ if (!entry)
+ goto done;
+
+ down(&entry->excl_sem);
+
+ if (entry->excl_cnt)
+ entry->excl_cnt = 0;
+
+ up(&entry->excl_sem);
+
+done:
+ return 0;
+}
+
+static void *config_proc_start(struct seq_file *m, loff_t *pos)
+{
+ return seq_list_start_head(&nd_struct_list, *pos);
+}
+
+static void *config_proc_next(struct seq_file *p, void *v, loff_t *pos)
+{
+ return seq_list_next(v, &nd_struct_list, pos);
+}
+
+static void config_proc_stop(struct seq_file *m, void *v)
+{
+}
+
+static int config_proc_show(struct seq_file *m, void *v)
+{
+ struct nd_struct *nd;
+ char tmp_id[4];
+
+ if (v == &nd_struct_list) {
+ seq_puts(m, "#-----------------------------------------------------------------------------\n");
+ seq_puts(m, "# Avail\n");
+ seq_puts(m, "# ID Major State Ports\n");
+ return 0;
+ }
+
+ nd = list_entry(v, struct nd_struct, list);
+
+ ID_TO_CHAR(nd->nd_ID, tmp_id);
+
+ seq_printf(m, " %-2.2s %-5ld %-10.10s %-5d\n",
+ tmp_id,
+ nd->nd_major,
+ ND_STATE_STR(nd->nd_state),
+ nd->nd_chan_count);
+
+ return 0;
+}
+
+static const struct seq_operations proc_config_ops = {
+ .start = config_proc_start,
+ .next = config_proc_next,
+ .stop = config_proc_stop,
+ .show = config_proc_show
+};
+
+static int config_proc_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &proc_config_ops);
+}
+
+
+/*
+ * When writing configuration information, each "record" (i.e. each
+ * write) is treated as an independent request. See the "parse"
+ * description for more details.
+ */
+static ssize_t config_proc_write(struct file *file, const char __user *buffer,
+ size_t count, loff_t *pos)
+{
+ ssize_t retval;
+ char *inbuf, *sp;
+ char *line, *ldelim;
+
+ if (count > 32768)
+ return -EINVAL;
+
+ inbuf = sp = vzalloc(count + 1);
+ if (!inbuf)
+ return -ENOMEM;
+
+ if (copy_from_user(inbuf, buffer, count)) {
+ retval = -EFAULT;
+ goto done;
+ }
+
+ inbuf[count] = 0;
+
+ ldelim = "\n";
+
+ line = strpbrk(sp, ldelim);
+ while (line) {
+ *line = 0;
+ retval = parse_write_config(sp);
+ if (retval)
+ goto done;
+
+ sp = line + 1;
+ line = strpbrk(sp, ldelim);
+ }
+
+ retval = count;
+done:
+ vfree(inbuf);
+ return retval;
+}
+
+/*
+ * ------------------------------------------------------------------------
+ *
+ * The following are the functions to parse input
+ *
+ * ------------------------------------------------------------------------
+ */
+static inline char *skip_past_ws(const char *str)
+{
+ while ((*str) && !isspace(*str))
+ ++str;
+
+ return skip_spaces(str);
+}
+
+static int parse_id(char **c, char *cID)
+{
+ int tmp = **c;
+
+ if (isalnum(tmp) || (tmp == '_'))
+ cID[0] = tmp;
+ else
+ return -EINVAL;
+
+ (*c)++; tmp = **c;
+
+ if (isalnum(tmp) || (tmp == '_')) {
+ cID[1] = tmp;
+ (*c)++;
+ } else
+ cID[1] = 0;
+
+ return 0;
+}
+
+static int parse_add_config(char *buf)
+{
+ char *c = buf;
+ int retval;
+ char cID[2];
+ long ID;
+
+ c = skip_past_ws(c);
+
+ retval = parse_id(&c, cID);
+ if (retval < 0)
+ return retval;
+
+ ID = CHAR_TO_ID(cID);
+
+ c = skip_past_ws(c);
+
+ return dgrp_add_id(ID);
+}
+
+static int parse_del_config(char *buf)
+{
+ char *c = buf;
+ int retval;
+ struct nd_struct *nd;
+ char cID[2];
+ long ID;
+ long major;
+
+ c = skip_past_ws(c);
+
+ retval = parse_id(&c, cID);
+ if (retval < 0)
+ return retval;
+
+ ID = CHAR_TO_ID(cID);
+
+ c = skip_past_ws(c);
+
+ retval = kstrtol(c, 10, &major);
+ if (retval)
+ return retval;
+
+ nd = nd_struct_get(major);
+ if (!nd)
+ return -EINVAL;
+
+ if ((nd->nd_major != major) || (nd->nd_ID != ID))
+ return -EINVAL;
+
+ return dgrp_remove_nd(nd);
+}
+
+static int parse_chg_config(char *buf)
+{
+ return -EINVAL;
+}
+
+/*
+ * The passed character buffer represents a single configuration request.
+ * If the first character is a "+", it is parsed as a request to add a
+ * PortServer
+ * If the first character is a "-", it is parsed as a request to delete a
+ * PortServer
+ * If the first character is a "*", it is parsed as a request to change a
+ * PortServer
+ * Any other character (including whitespace) causes the record to be
+ * ignored.
+ */
+static int parse_write_config(char *buf)
+{
+ int retval;
+
+ switch (buf[0]) {
+ case '+':
+ retval = parse_add_config(buf);
+ break;
+ case '-':
+ retval = parse_del_config(buf);
+ break;
+ case '*':
+ retval = parse_chg_config(buf);
+ break;
+ default:
+ retval = -EINVAL;
+ }
+
+ return retval;
+}
+
+static int info_proc_show(struct seq_file *m, void *v)
+{
+ seq_printf(m, "version: %s\n", DIGI_VERSION);
+ seq_puts(m, "register_with_sysfs: 1\n");
+ seq_printf(m, "rawreadok: 0x%08x\t(%d)\n",
+ dgrp_rawreadok, dgrp_rawreadok);
+ seq_printf(m, "pollrate: 0x%08x\t(%d)\n",
+ dgrp_poll_tick, dgrp_poll_tick);
+
+ return 0;
+}
+
+static int info_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, info_proc_show, NULL);
+}
+
+
+static void *nodeinfo_start(struct seq_file *m, loff_t *pos)
+{
+ return seq_list_start_head(&nd_struct_list, *pos);
+}
+
+static void *nodeinfo_next(struct seq_file *p, void *v, loff_t *pos)
+{
+ return seq_list_next(v, &nd_struct_list, pos);
+}
+
+static void nodeinfo_stop(struct seq_file *m, void *v)
+{
+}
+
+static int nodeinfo_show(struct seq_file *m, void *v)
+{
+ struct nd_struct *nd;
+ char hwver[8];
+ char swver[8];
+ char tmp_id[4];
+
+ if (v == &nd_struct_list) {
+ seq_puts(m, "#-----------------------------------------------------------------------------\n");
+ seq_puts(m, "# HW HW SW\n");
+ seq_puts(m, "# ID State Version ID Version Description\n");
+ return 0;
+ }
+
+ nd = list_entry(v, struct nd_struct, list);
+
+ ID_TO_CHAR(nd->nd_ID, tmp_id);
+
+ if (nd->nd_state == NS_READY) {
+ sprintf(hwver, "%d.%d", (nd->nd_hw_ver >> 8) & 0xff,
+ nd->nd_hw_ver & 0xff);
+ sprintf(swver, "%d.%d", (nd->nd_sw_ver >> 8) & 0xff,
+ nd->nd_sw_ver & 0xff);
+ seq_printf(m, " %-2.2s %-10.10s %-7.7s %-3d %-7.7s %-35.35s\n",
+ tmp_id,
+ ND_STATE_STR(nd->nd_state),
+ hwver,
+ nd->nd_hw_id,
+ swver,
+ nd->nd_ps_desc);
+
+ } else {
+ seq_printf(m, " %-2.2s %-10.10s\n",
+ tmp_id,
+ ND_STATE_STR(nd->nd_state));
+ }
+
+ return 0;
+}
+
+
+static const struct seq_operations nodeinfo_ops = {
+ .start = nodeinfo_start,
+ .next = nodeinfo_next,
+ .stop = nodeinfo_stop,
+ .show = nodeinfo_show
+};
+
+static int nodeinfo_proc_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &nodeinfo_ops);
+}
+
+/**
+ * dgrp_add_id() -- creates new nd struct and adds it to list
+ * @id: id of device to add
+ */
+static int dgrp_add_id(long id)
+{
+ struct nd_struct *nd;
+ int ret;
+ int i;
+
+ nd = kzalloc(sizeof(struct nd_struct), GFP_KERNEL);
+ if (!nd)
+ return -ENOMEM;
+
+ nd->nd_major = 0;
+ nd->nd_ID = id;
+
+ spin_lock_init(&nd->nd_lock);
+
+ init_waitqueue_head(&nd->nd_tx_waitq);
+ init_waitqueue_head(&nd->nd_mon_wqueue);
+ init_waitqueue_head(&nd->nd_dpa_wqueue);
+ for (i = 0; i < SEQ_MAX; i++)
+ init_waitqueue_head(&nd->nd_seq_wque[i]);
+
+ /* setup the structures to get the major number */
+ ret = dgrp_tty_init(nd);
+ if (ret)
+ goto error_out;
+
+ nd->nd_major = nd->nd_serial_ttdriver->major;
+
+ ret = nd_struct_add(nd);
+ if (ret)
+ goto error_out;
+
+ register_dgrp_device(nd, net_entry_pointer, dgrp_register_net_hook);
+ register_dgrp_device(nd, mon_entry_pointer, dgrp_register_mon_hook);
+ register_dgrp_device(nd, dpa_entry_pointer, dgrp_register_dpa_hook);
+ register_dgrp_device(nd, ports_entry_pointer,
+ dgrp_register_ports_hook);
+
+ return 0;
+
+error_out:
+ kfree(nd);
+ return ret;
+
+}
+
+static int dgrp_remove_nd(struct nd_struct *nd)
+{
+ int ret;
+
+ /* Check to see if the selected structure is in use */
+ if (nd->nd_tty_ref_cnt)
+ return -EBUSY;
+
+ if (nd->nd_net_de) {
+ unregister_dgrp_device(nd->nd_net_de);
+ dgrp_remove_node_class_sysfs_files(nd);
+ }
+
+ if (nd->nd_mon_de)
+ unregister_dgrp_device(nd->nd_mon_de);
+
+ if (nd->nd_ports_de)
+ unregister_dgrp_device(nd->nd_ports_de);
+
+ if (nd->nd_dpa_de)
+ unregister_dgrp_device(nd->nd_dpa_de);
+
+ dgrp_tty_uninit(nd);
+
+ ret = nd_struct_del(nd);
+ if (ret)
+ return ret;
+
+ kfree(nd);
+ return 0;
+}
+
+static void register_dgrp_device(struct nd_struct *node,
+ struct proc_dir_entry *root,
+ void (*register_hook)(struct proc_dir_entry *de))
+{
+ char buf[3];
+ struct proc_dir_entry *de;
+
+ ID_TO_CHAR(node->nd_ID, buf);
+
+ de = create_proc_entry(buf, 0600 | S_IFREG, root);
+ if (!de)
+ return;
+
+ de->data = (void *) node;
+
+ if (register_hook)
+ register_hook(de);
+
+}
+
+static void unregister_dgrp_device(struct proc_dir_entry *de)
+{
+ if (!de)
+ return;
+
+ /* Don't unregister proc entries that are still being used.. */
+ if ((atomic_read(&de->count)) != 1) {
+ pr_alert("%s - proc entry %s in use. Not removing.\n",
+ __func__, de->name);
+ return;
+ }
+
+ remove_proc_entry(de->name, de->parent);
+ de = NULL;
+}
--- /dev/null
+/*
+ * Copyright 2004 Digi International (www.digi.com)
+ * Scott H Kilau <Scott_Kilau at digi dot com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ */
+
+#include "dgrp_common.h"
+
+#include <linux/kernel.h>
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/serial_reg.h>
+#include <linux/pci.h>
+#include <linux/kdev_t.h>
+
+
+#define PORTSERVER_DIVIDEND 1843200
+#define SERIAL_TYPE_NORMAL 1
+#define SERIAL_TYPE_CALLOUT 2
+#define SERIAL_TYPE_XPRINT 3
+
+
+static struct class *dgrp_class;
+static struct device *dgrp_class_nodes_dev;
+static struct device *dgrp_class_global_settings_dev;
+
+
+static ssize_t dgrp_class_version_show(struct class *class,
+ struct class_attribute *attr, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%s\n", DIGI_VERSION);
+}
+static CLASS_ATTR(driver_version, 0400, dgrp_class_version_show, NULL);
+
+
+static ssize_t dgrp_class_register_with_sysfs_show(struct device *c,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "1\n");
+}
+static DEVICE_ATTR(register_with_sysfs, 0400,
+ dgrp_class_register_with_sysfs_show, NULL);
+
+
+static ssize_t dgrp_class_rawreadok_show(struct device *c,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", dgrp_rawreadok);
+}
+static ssize_t dgrp_class_rawreadok_store(struct device *c,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ sscanf(buf, "0x%x\n", &dgrp_rawreadok);
+ return count;
+}
+static DEVICE_ATTR(rawreadok, 0600, dgrp_class_rawreadok_show,
+ dgrp_class_rawreadok_store);
+
+
+static ssize_t dgrp_class_pollrate_show(struct device *c,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", dgrp_poll_tick);
+}
+
+static ssize_t dgrp_class_pollrate_store(struct device *c,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ sscanf(buf, "0x%x\n", &dgrp_poll_tick);
+ return count;
+}
+static DEVICE_ATTR(pollrate, 0600, dgrp_class_pollrate_show,
+ dgrp_class_pollrate_store);
+
+static struct attribute *dgrp_sysfs_global_settings_entries[] = {
+ &dev_attr_pollrate.attr,
+ &dev_attr_rawreadok.attr,
+ &dev_attr_register_with_sysfs.attr,
+ NULL
+};
+
+
+static struct attribute_group dgrp_global_settings_attribute_group = {
+ .name = NULL,
+ .attrs = dgrp_sysfs_global_settings_entries,
+};
+
+
+
+void dgrp_create_class_sysfs_files(void)
+{
+ int ret = 0;
+ int max_majors = 1U << (32 - MINORBITS);
+
+ dgrp_class = class_create(THIS_MODULE, "digi_realport");
+ ret = class_create_file(dgrp_class, &class_attr_driver_version);
+
+ dgrp_class_global_settings_dev = device_create(dgrp_class, NULL,
+ MKDEV(0, max_majors + 1), NULL, "driver_settings");
+
+ ret = sysfs_create_group(&dgrp_class_global_settings_dev->kobj,
+ &dgrp_global_settings_attribute_group);
+ if (ret) {
+ pr_alert("%s: failed to create sysfs global settings device attributes.\n",
+ __func__);
+ sysfs_remove_group(&dgrp_class_global_settings_dev->kobj,
+ &dgrp_global_settings_attribute_group);
+ return;
+ }
+
+ dgrp_class_nodes_dev = device_create(dgrp_class, NULL,
+ MKDEV(0, max_majors + 2), NULL, "nodes");
+
+}
+
+
+void dgrp_remove_class_sysfs_files(void)
+{
+ struct nd_struct *nd;
+ int max_majors = 1U << (32 - MINORBITS);
+
+ list_for_each_entry(nd, &nd_struct_list, list)
+ dgrp_remove_node_class_sysfs_files(nd);
+
+ sysfs_remove_group(&dgrp_class_global_settings_dev->kobj,
+ &dgrp_global_settings_attribute_group);
+
+ class_remove_file(dgrp_class, &class_attr_driver_version);
+
+ device_destroy(dgrp_class, MKDEV(0, max_majors + 1));
+ device_destroy(dgrp_class, MKDEV(0, max_majors + 2));
+ class_destroy(dgrp_class);
+}
+
+static ssize_t dgrp_node_state_show(struct device *c,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_struct *nd;
+
+ if (!c)
+ return 0;
+ nd = (struct nd_struct *) dev_get_drvdata(c);
+ if (!nd)
+ return 0;
+
+ return snprintf(buf, PAGE_SIZE, "%s\n", ND_STATE_STR(nd->nd_state));
+}
+
+static DEVICE_ATTR(state, 0600, dgrp_node_state_show, NULL);
+
+static ssize_t dgrp_node_description_show(struct device *c,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct nd_struct *nd;
+
+ if (!c)
+ return 0;
+ nd = (struct nd_struct *) dev_get_drvdata(c);
+ if (!nd)
+ return 0;
+
+ if (nd->nd_state == NS_READY && nd->nd_ps_desc)
+ return snprintf(buf, PAGE_SIZE, "%s\n", nd->nd_ps_desc);
+ return 0;
+}
+static DEVICE_ATTR(description_info, 0600, dgrp_node_description_show, NULL);
+
+static ssize_t dgrp_node_hw_version_show(struct device *c,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct nd_struct *nd;
+
+ if (!c)
+ return 0;
+ nd = (struct nd_struct *) dev_get_drvdata(c);
+ if (!nd)
+ return 0;
+
+ if (nd->nd_state == NS_READY)
+ return snprintf(buf, PAGE_SIZE, "%d.%d\n",
+ (nd->nd_hw_ver >> 8) & 0xff,
+ nd->nd_hw_ver & 0xff);
+
+ return 0;
+}
+static DEVICE_ATTR(hw_version_info, 0600, dgrp_node_hw_version_show, NULL);
+
+static ssize_t dgrp_node_hw_id_show(struct device *c,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_struct *nd;
+
+ if (!c)
+ return 0;
+ nd = (struct nd_struct *) dev_get_drvdata(c);
+ if (!nd)
+ return 0;
+
+
+ if (nd->nd_state == NS_READY)
+ return snprintf(buf, PAGE_SIZE, "%d\n", nd->nd_hw_id);
+ return 0;
+}
+static DEVICE_ATTR(hw_id_info, 0600, dgrp_node_hw_id_show, NULL);
+
+static ssize_t dgrp_node_sw_version_show(struct device *c,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct nd_struct *nd;
+
+ if (!c)
+ return 0;
+
+ nd = (struct nd_struct *) dev_get_drvdata(c);
+ if (!nd)
+ return 0;
+
+ if (nd->nd_state == NS_READY)
+ return snprintf(buf, PAGE_SIZE, "%d.%d\n",
+ (nd->nd_sw_ver >> 8) & 0xff,
+ nd->nd_sw_ver & 0xff);
+
+ return 0;
+}
+static DEVICE_ATTR(sw_version_info, 0600, dgrp_node_sw_version_show, NULL);
+
+
+static struct attribute *dgrp_sysfs_node_entries[] = {
+ &dev_attr_state.attr,
+ &dev_attr_description_info.attr,
+ &dev_attr_hw_version_info.attr,
+ &dev_attr_hw_id_info.attr,
+ &dev_attr_sw_version_info.attr,
+ NULL
+};
+
+
+static struct attribute_group dgrp_node_attribute_group = {
+ .name = NULL,
+ .attrs = dgrp_sysfs_node_entries,
+};
+
+
+void dgrp_create_node_class_sysfs_files(struct nd_struct *nd)
+{
+ int ret;
+ char name[10];
+
+ if (nd->nd_ID)
+ ID_TO_CHAR(nd->nd_ID, name);
+ else
+ sprintf(name, "node%ld", nd->nd_major);
+
+ nd->nd_class_dev = device_create(dgrp_class, dgrp_class_nodes_dev,
+ MKDEV(0, nd->nd_major), NULL, name);
+
+ ret = sysfs_create_group(&nd->nd_class_dev->kobj,
+ &dgrp_node_attribute_group);
+
+ if (ret) {
+ pr_alert("%s: failed to create sysfs node device attributes.\n",
+ __func__);
+ sysfs_remove_group(&nd->nd_class_dev->kobj,
+ &dgrp_node_attribute_group);
+ return;
+ }
+
+ dev_set_drvdata(nd->nd_class_dev, nd);
+
+}
+
+
+void dgrp_remove_node_class_sysfs_files(struct nd_struct *nd)
+{
+ if (nd->nd_class_dev) {
+ sysfs_remove_group(&nd->nd_class_dev->kobj,
+ &dgrp_node_attribute_group);
+
+ device_destroy(dgrp_class, MKDEV(0, nd->nd_major));
+ nd->nd_class_dev = NULL;
+ }
+}
+
+
+
+static ssize_t dgrp_tty_state_show(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ struct un_struct *un;
+
+ if (!d)
+ return 0;
+ un = (struct un_struct *) dev_get_drvdata(d);
+ if (!un)
+ return 0;
+
+ return snprintf(buf, PAGE_SIZE, "%s\n",
+ un->un_open_count ? "Open" : "Closed");
+}
+static DEVICE_ATTR(state_info, 0600, dgrp_tty_state_show, NULL);
+
+static ssize_t dgrp_tty_baud_show(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ struct ch_struct *ch;
+ struct un_struct *un;
+
+ if (!d)
+ return 0;
+ un = (struct un_struct *) dev_get_drvdata(d);
+ if (!un)
+ return 0;
+ ch = un->un_ch;
+ if (!ch)
+ return 0;
+ return snprintf(buf, PAGE_SIZE, "%d\n",
+ un->un_open_count ? (PORTSERVER_DIVIDEND / ch->ch_s_brate) : 0);
+}
+static DEVICE_ATTR(baud_info, 0400, dgrp_tty_baud_show, NULL);
+
+
+static ssize_t dgrp_tty_msignals_show(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ struct ch_struct *ch;
+ struct un_struct *un;
+
+ if (!d)
+ return 0;
+ un = (struct un_struct *) dev_get_drvdata(d);
+ if (!un)
+ return 0;
+ ch = un->un_ch;
+ if (!ch)
+ return 0;
+
+ if (ch->ch_open_count) {
+ return snprintf(buf, PAGE_SIZE, "%s %s %s %s %s %s\n",
+ (ch->ch_s_mlast & DM_RTS) ? "RTS" : "",
+ (ch->ch_s_mlast & DM_CTS) ? "CTS" : "",
+ (ch->ch_s_mlast & DM_DTR) ? "DTR" : "",
+ (ch->ch_s_mlast & DM_DSR) ? "DSR" : "",
+ (ch->ch_s_mlast & DM_CD) ? "DCD" : "",
+ (ch->ch_s_mlast & DM_RI) ? "RI" : "");
+ }
+ return 0;
+}
+static DEVICE_ATTR(msignals_info, 0400, dgrp_tty_msignals_show, NULL);
+
+
+static ssize_t dgrp_tty_iflag_show(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ struct ch_struct *ch;
+ struct un_struct *un;
+
+ if (!d)
+ return 0;
+ un = (struct un_struct *) dev_get_drvdata(d);
+ if (!un)
+ return 0;
+ ch = un->un_ch;
+ if (!ch)
+ return 0;
+ return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_s_iflag);
+}
+static DEVICE_ATTR(iflag_info, 0600, dgrp_tty_iflag_show, NULL);
+
+
+static ssize_t dgrp_tty_cflag_show(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ struct ch_struct *ch;
+ struct un_struct *un;
+
+ if (!d)
+ return 0;
+ un = (struct un_struct *) dev_get_drvdata(d);
+ if (!un)
+ return 0;
+ ch = un->un_ch;
+ if (!ch)
+ return 0;
+ return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_s_cflag);
+}
+static DEVICE_ATTR(cflag_info, 0600, dgrp_tty_cflag_show, NULL);
+
+
+static ssize_t dgrp_tty_oflag_show(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ struct ch_struct *ch;
+ struct un_struct *un;
+
+ if (!d)
+ return 0;
+ un = (struct un_struct *) dev_get_drvdata(d);
+ if (!un)
+ return 0;
+ ch = un->un_ch;
+ if (!ch)
+ return 0;
+ return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_s_oflag);
+}
+static DEVICE_ATTR(oflag_info, 0600, dgrp_tty_oflag_show, NULL);
+
+
+static ssize_t dgrp_tty_digi_flag_show(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ struct ch_struct *ch;
+ struct un_struct *un;
+
+ if (!d)
+ return 0;
+ un = (struct un_struct *) dev_get_drvdata(d);
+ if (!un)
+ return 0;
+ ch = un->un_ch;
+ if (!ch)
+ return 0;
+ return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_digi.digi_flags);
+}
+static DEVICE_ATTR(digi_flag_info, 0600, dgrp_tty_digi_flag_show, NULL);
+
+
+static ssize_t dgrp_tty_rxcount_show(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ struct ch_struct *ch;
+ struct un_struct *un;
+
+ if (!d)
+ return 0;
+ un = (struct un_struct *) dev_get_drvdata(d);
+ if (!un)
+ return 0;
+ ch = un->un_ch;
+ if (!ch)
+ return 0;
+ return snprintf(buf, PAGE_SIZE, "%d\n", ch->ch_rxcount);
+}
+static DEVICE_ATTR(rxcount_info, 0600, dgrp_tty_rxcount_show, NULL);
+
+
+static ssize_t dgrp_tty_txcount_show(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ struct ch_struct *ch;
+ struct un_struct *un;
+
+ if (!d)
+ return 0;
+ un = (struct un_struct *) dev_get_drvdata(d);
+ if (!un)
+ return 0;
+ ch = un->un_ch;
+ if (!ch)
+ return 0;
+ return snprintf(buf, PAGE_SIZE, "%d\n", ch->ch_txcount);
+}
+static DEVICE_ATTR(txcount_info, 0600, dgrp_tty_txcount_show, NULL);
+
+
+static ssize_t dgrp_tty_name_show(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ struct nd_struct *nd;
+ struct ch_struct *ch;
+ struct un_struct *un;
+ char name[10];
+
+ if (!d)
+ return 0;
+ un = (struct un_struct *) dev_get_drvdata(d);
+ if (!un)
+ return 0;
+ ch = un->un_ch;
+ if (!ch)
+ return 0;
+ nd = ch->ch_nd;
+ if (!nd)
+ return 0;
+
+ ID_TO_CHAR(nd->nd_ID, name);
+
+ return snprintf(buf, PAGE_SIZE, "%s%s%02d\n",
+ un->un_type == SERIAL_TYPE_XPRINT ? "pr" : "tty",
+ name, ch->ch_portnum);
+}
+static DEVICE_ATTR(custom_name, 0600, dgrp_tty_name_show, NULL);
+
+
+static struct attribute *dgrp_sysfs_tty_entries[] = {
+ &dev_attr_state_info.attr,
+ &dev_attr_baud_info.attr,
+ &dev_attr_msignals_info.attr,
+ &dev_attr_iflag_info.attr,
+ &dev_attr_cflag_info.attr,
+ &dev_attr_oflag_info.attr,
+ &dev_attr_digi_flag_info.attr,
+ &dev_attr_rxcount_info.attr,
+ &dev_attr_txcount_info.attr,
+ &dev_attr_custom_name.attr,
+ NULL
+};
+
+
+static struct attribute_group dgrp_tty_attribute_group = {
+ .name = NULL,
+ .attrs = dgrp_sysfs_tty_entries,
+};
+
+
+void dgrp_create_tty_sysfs(struct un_struct *un, struct device *c)
+{
+ int ret;
+
+ ret = sysfs_create_group(&c->kobj, &dgrp_tty_attribute_group);
+ if (ret) {
+ pr_alert("%s: failed to create sysfs tty device attributes.\n",
+ __func__);
+ sysfs_remove_group(&c->kobj, &dgrp_tty_attribute_group);
+ return;
+ }
+
+ dev_set_drvdata(c, un);
+
+}
+
+
+void dgrp_remove_tty_sysfs(struct device *c)
+{
+ sysfs_remove_group(&c->kobj, &dgrp_tty_attribute_group);
+}
--- /dev/null
+/*
+ *
+ * Copyright 1999 Digi International (www.digi.com)
+ * Gene Olson <Gene_Olson at digi dot com>
+ * James Puzzo <jamesp at digi dot com>
+ * Jeff Randall
+ * Scott Kilau <scottk at digi dot com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ */
+
+/*
+ *
+ * Filename:
+ *
+ * dgrp_tty.c
+ *
+ * Description:
+ *
+ * This file implements the tty driver functionality for the
+ * RealPort driver software.
+ *
+ * Author:
+ *
+ * James A. Puzzo
+ * Ann-Marie Westgate
+ *
+ */
+
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/sched.h>
+
+#include "dgrp_common.h"
+
+#ifndef _POSIX_VDISABLE
+#define _POSIX_VDISABLE ('\0')
+#endif
+
+/*
+ * forward declarations
+ */
+
+static void drp_param(struct ch_struct *);
+static void dgrp_tty_close(struct tty_struct *, struct file *);
+
+/* ioctl helper functions */
+static int set_modem_info(struct ch_struct *, unsigned int, unsigned int *);
+static int get_modem_info(struct ch_struct *, unsigned int *);
+static void dgrp_set_custom_speed(struct ch_struct *, int);
+static int dgrp_tty_digigetedelay(struct tty_struct *, int *);
+static int dgrp_tty_digisetedelay(struct tty_struct *, int *);
+static int dgrp_send_break(struct ch_struct *, int);
+
+static ushort tty_to_ch_flags(struct tty_struct *, char);
+static tcflag_t ch_to_tty_flags(unsigned short, char);
+
+static void dgrp_tty_input_start(struct tty_struct *);
+static void dgrp_tty_input_stop(struct tty_struct *);
+
+static void drp_wmove(struct ch_struct *, int, void*, int);
+
+static int dgrp_tty_open(struct tty_struct *, struct file *);
+static void dgrp_tty_close(struct tty_struct *, struct file *);
+static int dgrp_tty_write(struct tty_struct *, const unsigned char *, int);
+static int dgrp_tty_write_room(struct tty_struct *);
+static void dgrp_tty_flush_buffer(struct tty_struct *);
+static int dgrp_tty_chars_in_buffer(struct tty_struct *);
+static int dgrp_tty_ioctl(struct tty_struct *, unsigned int, unsigned long);
+static void dgrp_tty_set_termios(struct tty_struct *, struct ktermios *);
+static void dgrp_tty_stop(struct tty_struct *);
+static void dgrp_tty_start(struct tty_struct *);
+static void dgrp_tty_throttle(struct tty_struct *);
+static void dgrp_tty_unthrottle(struct tty_struct *);
+static void dgrp_tty_hangup(struct tty_struct *);
+static int dgrp_tty_put_char(struct tty_struct *, unsigned char);
+static int dgrp_tty_tiocmget(struct tty_struct *);
+static int dgrp_tty_tiocmset(struct tty_struct *, unsigned int, unsigned int);
+static int dgrp_tty_send_break(struct tty_struct *, int);
+static void dgrp_tty_send_xchar(struct tty_struct *, char);
+
+/*
+ * tty defines
+ */
+#define SERIAL_TYPE_NORMAL 1
+#define SERIAL_TYPE_CALLOUT 2
+#define SERIAL_TYPE_XPRINT 3
+
+
+/*
+ * tty globals/statics
+ */
+
+
+#define PORTSERVER_DIVIDEND 1843200
+
+/*
+ * Default transparent print information.
+ */
+static struct digi_struct digi_init = {
+ .digi_flags = DIGI_COOK, /* Flags */
+ .digi_maxcps = 100, /* Max CPS */
+ .digi_maxchar = 50, /* Max chars in print queue */
+ .digi_bufsize = 100, /* Printer buffer size */
+ .digi_onlen = 4, /* size of printer on string */
+ .digi_offlen = 4, /* size of printer off string */
+ .digi_onstr = "\033[5i", /* ANSI printer on string */
+ .digi_offstr = "\033[4i", /* ANSI printer off string */
+ .digi_term = "ansi" /* default terminal type */
+};
+
+/*
+ * Define a local default termios struct. All ports will be created
+ * with this termios initially.
+ *
+ * This defines a raw port at 9600 baud, 8 data bits, no parity,
+ * 1 stop bit.
+ */
+static struct ktermios DefaultTermios = {
+ .c_iflag = (ICRNL | IXON),
+ .c_oflag = (OPOST | ONLCR),
+ .c_cflag = (B9600 | CS8 | CREAD | HUPCL | CLOCAL),
+ .c_lflag = (ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL
+ | ECHOKE | IEXTEN),
+ .c_cc = INIT_C_CC,
+ .c_line = 0,
+};
+
+/* Define our tty operations struct */
+static const struct tty_operations dgrp_tty_ops = {
+ .open = dgrp_tty_open,
+ .close = dgrp_tty_close,
+ .write = dgrp_tty_write,
+ .write_room = dgrp_tty_write_room,
+ .flush_buffer = dgrp_tty_flush_buffer,
+ .chars_in_buffer = dgrp_tty_chars_in_buffer,
+ .flush_chars = NULL,
+ .ioctl = dgrp_tty_ioctl,
+ .set_termios = dgrp_tty_set_termios,
+ .stop = dgrp_tty_stop,
+ .start = dgrp_tty_start,
+ .throttle = dgrp_tty_throttle,
+ .unthrottle = dgrp_tty_unthrottle,
+ .hangup = dgrp_tty_hangup,
+ .put_char = dgrp_tty_put_char,
+ .tiocmget = dgrp_tty_tiocmget,
+ .tiocmset = dgrp_tty_tiocmset,
+ .break_ctl = dgrp_tty_send_break,
+ .send_xchar = dgrp_tty_send_xchar
+};
+
+
+static int calc_baud_rate(struct un_struct *un)
+{
+ int i;
+ int brate;
+
+ struct baud_rates {
+ unsigned int rate;
+ unsigned int cflag;
+ };
+
+ static struct baud_rates baud_rates[] = {
+ { 921600, B921600 },
+ { 460800, B460800 },
+ { 230400, B230400 },
+ { 115200, B115200 },
+ { 57600, B57600 },
+ { 38400, B38400 },
+ { 19200, B19200 },
+ { 9600, B9600 },
+ { 4800, B4800 },
+ { 2400, B2400 },
+ { 1200, B1200 },
+ { 600, B600 },
+ { 300, B300 },
+ { 200, B200 },
+ { 150, B150 },
+ { 134, B134 },
+ { 110, B110 },
+ { 75, B75 },
+ { 50, B50 },
+ { 0, B9600 }
+ };
+
+ brate = C_BAUD(un->un_tty);
+
+ for (i = 0; baud_rates[i].rate; i++) {
+ if (baud_rates[i].cflag == brate)
+ break;
+ }
+
+ return baud_rates[i].rate;
+}
+
+static int calc_fastbaud_rate(struct un_struct *un, struct ktermios *uts)
+{
+ int i;
+ int brate;
+
+ ulong bauds[2][16] = {
+ { /* fastbaud*/
+ 0, 57600, 76800, 115200,
+ 131657, 153600, 230400, 460800,
+ 921600, 1200, 1800, 2400,
+ 4800, 9600, 19200, 38400 },
+ { /* fastbaud & CBAUDEX */
+ 0, 57600, 115200, 230400,
+ 460800, 150, 200, 921600,
+ 600, 1200, 1800, 2400,
+ 4800, 9600, 19200, 38400 }
+ };
+
+ brate = C_BAUD(un->un_tty) & 0xff;
+
+ i = (uts->c_cflag & CBAUDEX) ? 1 : 0;
+
+
+ if ((i >= 0) && (i < 2) && (brate >= 0) && (brate < 16))
+ brate = bauds[i][brate];
+ else
+ brate = 0;
+
+ return brate;
+}
+
+/**
+ * drp_param() -- send parameter values to be sent to the node
+ * @ch: channel structure of port to modify
+ *
+ * Interprets the tty and modem changes made by an application
+ * program (by examining the termios structures) and sets up
+ * parameter values to be sent to the node.
+ */
+static void drp_param(struct ch_struct *ch)
+{
+ struct nd_struct *nd;
+ struct un_struct *un;
+ int brate;
+ int mflow;
+ int xflag;
+ int iflag;
+ struct ktermios *tts, *pts, *uts;
+
+ nd = ch->ch_nd;
+
+ /*
+ * If the terminal device is open, use it to set up all tty
+ * modes and functions. Otherwise use the printer device.
+ */
+
+ if (ch->ch_tun.un_open_count) {
+
+ un = &ch->ch_tun;
+ tts = &ch->ch_tun.un_tty->termios;
+
+ /*
+ * If both devices are open, copy critical line
+ * parameters from the tty device to the printer,
+ * so that if the tty is closed, the printer will
+ * continue without disruption.
+ */
+
+ if (ch->ch_pun.un_open_count) {
+
+ pts = &ch->ch_pun.un_tty->termios;
+
+ pts->c_cflag ^=
+ (pts->c_cflag ^ tts->c_cflag) &
+ (CBAUD | CSIZE | CSTOPB | CREAD | PARENB |
+ PARODD | HUPCL | CLOCAL);
+
+ pts->c_iflag ^=
+ (pts->c_iflag ^ tts->c_iflag) &
+ (IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK |
+ ISTRIP | IXON | IXANY | IXOFF);
+
+ pts->c_cc[VSTART] = tts->c_cc[VSTART];
+ pts->c_cc[VSTOP] = tts->c_cc[VSTOP];
+ }
+ } else if (ch->ch_pun.un_open_count == 0) {
+ pr_warn("%s - ch_pun.un_open_count shouldn't be 0\n",
+ __func__);
+ return;
+ } else {
+ un = &ch->ch_pun;
+ }
+
+ uts = &un->un_tty->termios;
+
+ /*
+ * Determine if FAST writes can be performed.
+ */
+
+ if ((ch->ch_digi.digi_flags & DIGI_COOK) != 0 &&
+ (ch->ch_tun.un_open_count != 0) &&
+ !((un->un_tty)->ldisc->ops->flags & LDISC_FLAG_DEFINED) &&
+ !(L_XCASE(un->un_tty))) {
+ ch->ch_flag |= CH_FAST_WRITE;
+ } else {
+ ch->ch_flag &= ~CH_FAST_WRITE;
+ }
+
+ /*
+ * If FAST writes can be performed, and OPOST is on in the
+ * terminal device, do OPOST handling in the server.
+ */
+
+ if ((ch->ch_flag & CH_FAST_WRITE) &&
+ O_OPOST(un->un_tty) != 0) {
+ int oflag = tty_to_ch_flags(un->un_tty, 'o');
+
+ /* add to ch_ocook any processing flags set in the termio */
+ ch->ch_ocook |= oflag & (OF_OLCUC |
+ OF_ONLCR |
+ OF_OCRNL |
+ OF_ONLRET |
+ OF_TABDLY);
+
+ /*
+ * the hpux driver clears any flags set in ch_ocook
+ * from the termios oflag. It is STILL reported though
+ * by a TCGETA
+ */
+
+ oflag = ch_to_tty_flags(ch->ch_ocook, 'o');
+ uts->c_oflag &= ~oflag;
+
+ } else {
+ /* clear the ch->ch_ocook flag */
+ int oflag = ch_to_tty_flags(ch->ch_ocook, 'o');
+ uts->c_oflag |= oflag;
+ ch->ch_ocook = 0;
+ }
+
+ ch->ch_oflag = ch->ch_ocook;
+
+
+ ch->ch_flag &= ~CH_FAST_READ;
+
+ /*
+ * Generate channel flags
+ */
+
+ if (C_BAUD(un->un_tty) == B0) {
+ if (!(ch->ch_flag & CH_BAUD0)) {
+ /* TODO : the HPUX driver flushes line */
+ /* TODO : discipline, I assume I don't have to */
+
+ ch->ch_tout = ch->ch_tin;
+ ch->ch_rout = ch->ch_rin;
+
+ ch->ch_break_time = 0;
+
+ ch->ch_send |= RR_TX_FLUSH | RR_RX_FLUSH;
+
+ ch->ch_mout &= ~(DM_DTR | DM_RTS);
+
+ ch->ch_flag |= CH_BAUD0;
+ }
+ } else if (ch->ch_custom_speed) {
+ ch->ch_brate = PORTSERVER_DIVIDEND / ch->ch_custom_speed ;
+
+ if (ch->ch_flag & CH_BAUD0) {
+ ch->ch_mout |= DM_DTR | DM_RTS;
+
+ ch->ch_flag &= ~CH_BAUD0;
+ }
+ } else {
+ /*
+ * Baud rate mapping.
+ *
+ * If FASTBAUD isn't on, we can scan the new baud rate list
+ * as required.
+ *
+ * However, if FASTBAUD is on, we must go to the old
+ * baud rate mapping that existed many many moons ago,
+ * for compatibility reasons.
+ */
+
+ if (!(ch->ch_digi.digi_flags & DIGI_FAST))
+ brate = calc_baud_rate(un);
+ else
+ brate = calc_fastbaud_rate(un, uts);
+
+ if (brate == 0)
+ brate = 9600;
+
+ ch->ch_brate = PORTSERVER_DIVIDEND / brate;
+
+ if (ch->ch_flag & CH_BAUD0) {
+ ch->ch_mout |= DM_DTR | DM_RTS;
+
+ ch->ch_flag &= ~CH_BAUD0;
+ }
+ }
+
+ /*
+ * Generate channel cflags from the termio.
+ */
+
+ ch->ch_cflag = tty_to_ch_flags(un->un_tty, 'c');
+
+ /*
+ * Generate channel iflags from the termio.
+ */
+
+ iflag = (int) tty_to_ch_flags(un->un_tty, 'i');
+
+ if (START_CHAR(un->un_tty) == _POSIX_VDISABLE ||
+ STOP_CHAR(un->un_tty) == _POSIX_VDISABLE) {
+ iflag &= ~(IF_IXON | IF_IXANY | IF_IXOFF);
+ }
+
+ ch->ch_iflag = iflag;
+
+ /*
+ * Generate flow control characters
+ */
+
+ /*
+ * From the POSIX.1 spec (7.1.2.6): "If {_POSIX_VDISABLE}
+ * is defined for the terminal device file, and the value
+ * of one of the changable special control characters (see
+ * 7.1.1.9) is {_POSIX_VDISABLE}, that function shall be
+ * disabled, that is, no input data shall be recognized as
+ * the disabled special character."
+ *
+ * OK, so we don't ever assign S/DXB XON or XOFF to _POSIX_VDISABLE.
+ */
+
+ if (uts->c_cc[VSTART] != _POSIX_VDISABLE)
+ ch->ch_xon = uts->c_cc[VSTART];
+ if (uts->c_cc[VSTOP] != _POSIX_VDISABLE)
+ ch->ch_xoff = uts->c_cc[VSTOP];
+
+ ch->ch_lnext = (uts->c_cc[VLNEXT] == _POSIX_VDISABLE ? 0 :
+ uts->c_cc[VLNEXT]);
+
+ /*
+ * Also, if either c_cc[START] or c_cc[STOP] is set to
+ * _POSIX_VDISABLE, we can't really do software flow
+ * control--in either direction--so we turn it off as
+ * far as S/DXB is concerned. In essence, if you disable
+ * one, you disable the other too.
+ */
+ if ((uts->c_cc[VSTART] == _POSIX_VDISABLE) ||
+ (uts->c_cc[VSTOP] == _POSIX_VDISABLE))
+ ch->ch_iflag &= ~(IF_IXOFF | IF_IXON);
+
+ /*
+ * Update xflags.
+ */
+
+ xflag = 0;
+
+ if (ch->ch_digi.digi_flags & DIGI_AIXON)
+ xflag = XF_XIXON;
+
+ if ((ch->ch_xxon == _POSIX_VDISABLE) ||
+ (ch->ch_xxoff == _POSIX_VDISABLE))
+ xflag &= ~XF_XIXON;
+
+ ch->ch_xflag = xflag;
+
+
+ /*
+ * Figure effective DCD value.
+ */
+
+ if (C_CLOCAL(un->un_tty))
+ ch->ch_flag |= CH_CLOCAL;
+ else
+ ch->ch_flag &= ~CH_CLOCAL;
+
+ /*
+ * Check modem signals
+ */
+
+ dgrp_carrier(ch);
+
+ /*
+ * Get hardware handshake value.
+ */
+
+ mflow = 0;
+
+ if (C_CRTSCTS(un->un_tty))
+ mflow |= (DM_RTS | DM_CTS);
+
+ if (ch->ch_digi.digi_flags & RTSPACE)
+ mflow |= DM_RTS;
+
+ if (ch->ch_digi.digi_flags & DTRPACE)
+ mflow |= DM_DTR;
+
+ if (ch->ch_digi.digi_flags & CTSPACE)
+ mflow |= DM_CTS;
+
+ if (ch->ch_digi.digi_flags & DSRPACE)
+ mflow |= DM_DSR;
+
+ if (ch->ch_digi.digi_flags & DCDPACE)
+ mflow |= DM_CD;
+
+ if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)
+ mflow |= DM_RTS_TOGGLE;
+
+ ch->ch_mflow = mflow;
+
+ /*
+ * Send the changes to the server.
+ */
+
+ ch->ch_flag |= CH_PARAM;
+ (ch->ch_nd)->nd_tx_work = 1;
+
+ if (waitqueue_active(&ch->ch_flag_wait))
+ wake_up_interruptible(&ch->ch_flag_wait);
+}
+
+/*
+ * This function is just used as a callback for timeouts
+ * waiting on the ch_sleep flag.
+ */
+static void wake_up_drp_sleep_timer(unsigned long ptr)
+{
+ struct ch_struct *ch = (struct ch_struct *) ptr;
+ if (ch)
+ wake_up(&ch->ch_sleep);
+}
+
+
+/*
+ * Set up our own sleep that can't be cancelled
+ * until our timeout occurs.
+ */
+static void drp_my_sleep(struct ch_struct *ch)
+{
+ struct timer_list drp_wakeup_timer;
+ DECLARE_WAITQUEUE(wait, current);
+
+ /*
+ * First make sure we're ready to receive the wakeup.
+ */
+
+ add_wait_queue(&ch->ch_sleep, &wait);
+ current->state = TASK_UNINTERRUPTIBLE;
+
+ /*
+ * Since we are uninterruptible, set a timer to
+ * unset the uninterruptable state in 1 second.
+ */
+
+ init_timer(&drp_wakeup_timer);
+ drp_wakeup_timer.function = wake_up_drp_sleep_timer;
+ drp_wakeup_timer.data = (unsigned long) ch;
+ drp_wakeup_timer.expires = jiffies + (1 * HZ);
+ add_timer(&drp_wakeup_timer);
+
+ schedule();
+
+ del_timer(&drp_wakeup_timer);
+
+ remove_wait_queue(&ch->ch_sleep, &wait);
+}
+
+/*
+ * dgrp_tty_open()
+ *
+ * returns:
+ * -EBUSY - this is a callout device and the normal device is active
+ * - there is an error in opening the tty
+ * -ENODEV - the channel does not exist
+ * -EAGAIN - we are in the middle of hanging up or closing
+ * - IMMEDIATE_OPEN fails
+ * -ENXIO or -EAGAIN
+ * - if the port is outside physical range
+ * -EINTR - the open is interrupted
+ *
+ */
+static int dgrp_tty_open(struct tty_struct *tty, struct file *file)
+{
+ int retval = 0;
+ struct nd_struct *nd;
+ struct ch_struct *ch;
+ struct un_struct *un;
+ int port;
+ int delay_error;
+ int otype;
+ int unf;
+ int wait_carrier;
+ int category;
+ int counts_were_incremented = 0;
+ ulong lock_flags;
+ DECLARE_WAITQUEUE(wait, current);
+
+ /*
+ * Do some initial checks to see if the node and port exist
+ */
+
+ nd = nd_struct_get(MAJOR(tty_devnum(tty)));
+ port = PORT_NUM(MINOR(tty_devnum(tty)));
+ category = OPEN_CATEGORY(MINOR(tty_devnum(tty)));
+
+ if (!nd)
+ return -ENODEV;
+
+ if (port >= CHAN_MAX)
+ return -ENODEV;
+
+ /*
+ * The channel exists.
+ */
+
+ ch = nd->nd_chan + port;
+
+ un = IS_PRINT(MINOR(tty_devnum(tty))) ? &ch->ch_pun : &ch->ch_tun;
+ un->un_tty = tty;
+ tty->driver_data = un;
+
+ /*
+ * If we are in the middle of hanging up,
+ * then return an error
+ */
+ if (tty_hung_up_p(file)) {
+ retval = ((un->un_flag & UN_HUP_NOTIFY) ?
+ -EAGAIN : -ERESTARTSYS);
+ goto done;
+ }
+
+ /*
+ * If the port is in the middle of closing, then block
+ * until it is done, then try again.
+ */
+ retval = wait_event_interruptible(un->un_close_wait,
+ ((un->un_flag & UN_CLOSING) == 0));
+
+ if (retval)
+ goto done;
+
+ /*
+ * If the port is in the middle of a reopen after a network disconnect,
+ * wait until it is done, then try again.
+ */
+ retval = wait_event_interruptible(ch->ch_flag_wait,
+ ((ch->ch_flag & CH_PORT_GONE) == 0));
+
+ if (retval)
+ goto done;
+
+ /*
+ * If this is a callout device, then just make sure the normal
+ * device isn't being used.
+ */
+
+ if (tty->driver->subtype == SERIAL_TYPE_CALLOUT) {
+ if (un->un_flag & UN_NORMAL_ACTIVE) {
+ retval = -EBUSY;
+ goto done;
+ } else {
+ un->un_flag |= UN_CALLOUT_ACTIVE;
+ }
+ }
+
+ /*
+ * Loop waiting until the open can be successfully completed.
+ */
+
+ spin_lock_irqsave(&nd->nd_lock, lock_flags);
+
+ nd->nd_tx_work = 1;
+
+ for (;;) {
+ wait_carrier = 0;
+
+ /*
+ * Determine the open type from the flags provided.
+ */
+
+ /*
+ * If the port is not enabled, then exit
+ */
+ if (test_bit(TTY_IO_ERROR, &tty->flags)) {
+ /* there was an error in opening the tty */
+ if (un->un_flag & UN_CALLOUT_ACTIVE)
+ retval = -EBUSY;
+ else
+ un->un_flag |= UN_NORMAL_ACTIVE;
+ goto unlock;
+ }
+
+ if (file->f_flags & O_NONBLOCK) {
+
+ /*
+ * if the O_NONBLOCK is set, errors on read and write
+ * must return -EAGAIN immediately and NOT sleep
+ * on the waitqs.
+ */
+ otype = OTYPE_IMMEDIATE;
+ delay_error = -EAGAIN;
+
+ } else if (!OPEN_WAIT_AVAIL(category) ||
+ (file->f_flags & O_NDELAY) != 0) {
+ otype = OTYPE_IMMEDIATE;
+ delay_error = -EBUSY;
+
+ } else if (!OPEN_WAIT_CARRIER(category) ||
+ ((ch->ch_digi.digi_flags & DIGI_FORCEDCD) != 0) ||
+ C_CLOCAL(tty)) {
+ otype = OTYPE_PERSISTENT;
+ delay_error = 0;
+
+ } else {
+ otype = OTYPE_INCOMING;
+ delay_error = 0;
+ }
+
+ /*
+ * Handle port currently outside physical port range.
+ */
+
+ if (port >= nd->nd_chan_count) {
+ if (otype == OTYPE_IMMEDIATE) {
+ retval = (nd->nd_state == NS_READY) ?
+ -ENXIO : -EAGAIN;
+ goto unlock;
+ }
+ }
+
+ /*
+ * Handle port not currently open.
+ */
+
+ else if (ch->ch_open_count == 0) {
+ /*
+ * Return an error when an Incoming Open
+ * response indicates the port is busy.
+ */
+
+ if (ch->ch_open_error != 0 && otype == ch->ch_otype) {
+ retval = (ch->ch_open_error <= 2) ?
+ delay_error : -ENXIO ;
+ goto unlock;
+ }
+
+ /*
+ * Fail any new Immediate open if we do not have
+ * a normal connection to the server.
+ */
+
+ if (nd->nd_state != NS_READY &&
+ otype == OTYPE_IMMEDIATE) {
+ retval = -EAGAIN;
+ goto unlock;
+ }
+
+ /*
+ * If a Realport open of the correct type has
+ * succeeded, complete the open.
+ */
+
+ if (ch->ch_state == CS_READY && ch->ch_otype == otype)
+ break;
+ }
+
+ /*
+ * Handle port already open and active as a device
+ * of same category.
+ */
+
+ else if ((ch->ch_category == category) ||
+ IS_PRINT(MINOR(tty_devnum(tty)))) {
+ /*
+ * Fail if opening the device now would
+ * violate exclusive use.
+ */
+ unf = ch->ch_tun.un_flag | ch->ch_pun.un_flag;
+
+ if ((file->f_flags & O_EXCL) || (unf & UN_EXCL)) {
+ retval = -EBUSY;
+ goto unlock;
+ }
+
+ /*
+ * If the open device is in the hangup state, all
+ * system calls fail except close().
+ */
+
+ /* TODO : check on hangup_p calls */
+
+ if (ch->ch_flag & CH_HANGUP) {
+ retval = -ENXIO;
+ goto unlock;
+ }
+
+ /*
+ * If the port is ready, and carrier is ignored
+ * or present, then complete the open.
+ */
+
+ if (ch->ch_state == CS_READY &&
+ (otype != OTYPE_INCOMING ||
+ ch->ch_flag & CH_VIRT_CD))
+ break;
+
+ wait_carrier = 1;
+ }
+
+ /*
+ * Handle port active with a different category device.
+ */
+
+ else {
+ if (otype == OTYPE_IMMEDIATE) {
+ retval = delay_error;
+ goto unlock;
+ }
+ }
+
+ /*
+ * Wait until conditions change, then take another
+ * try at the open.
+ */
+
+ ch->ch_wait_count[otype]++;
+
+ if (wait_carrier)
+ ch->ch_wait_carrier++;
+
+ /*
+ * Prepare the task to accept the wakeup, then
+ * release our locks and release control.
+ */
+
+ add_wait_queue(&ch->ch_flag_wait, &wait);
+ current->state = TASK_INTERRUPTIBLE;
+
+ spin_unlock_irqrestore(&nd->nd_lock, lock_flags);
+
+ /*
+ * Give up control, we'll come back if we're
+ * interrupted or are woken up.
+ */
+ schedule();
+ remove_wait_queue(&ch->ch_flag_wait, &wait);
+
+ spin_lock_irqsave(&nd->nd_lock, lock_flags);
+
+ current->state = TASK_RUNNING;
+
+ ch->ch_wait_count[otype]--;
+
+ if (wait_carrier)
+ ch->ch_wait_carrier--;
+
+ nd->nd_tx_work = 1;
+
+ if (signal_pending(current)) {
+ retval = -EINTR;
+ goto unlock;
+ }
+ } /* end for(;;) */
+
+ /*
+ * The open has succeeded. No turning back.
+ */
+ counts_were_incremented = 1;
+ un->un_open_count++;
+ ch->ch_open_count++;
+
+ /*
+ * Initialize the channel, if it's not already open.
+ */
+
+ if (ch->ch_open_count == 1) {
+ ch->ch_flag = 0;
+ ch->ch_inwait = 0;
+ ch->ch_category = category;
+ ch->ch_pscan_state = 0;
+
+ /* TODO : find out what PS-1 bug Gene was referring to */
+ /* TODO : in the following comment. */
+
+ ch->ch_send = RR_TX_START | RR_RX_START; /* PS-1 bug */
+
+ if (C_CLOCAL(tty) ||
+ ch->ch_s_mlast & DM_CD ||
+ ch->ch_digi.digi_flags & DIGI_FORCEDCD)
+ ch->ch_flag |= CH_VIRT_CD;
+ else if (OPEN_FORCES_CARRIER(category))
+ ch->ch_flag |= CH_VIRT_CD;
+
+ }
+
+ /*
+ * Initialize the unit, if it is not already open.
+ */
+
+ if (un->un_open_count == 1) {
+ /*
+ * Since all terminal options are always sticky in Linux,
+ * we don't need the UN_STICKY flag to be handled specially.
+ */
+ /* clears all the digi flags, leaves serial flags */
+ un->un_flag &= ~UN_DIGI_MASK;
+
+ if (file->f_flags & O_EXCL)
+ un->un_flag |= UN_EXCL;
+
+ /* TODO : include "session" and "pgrp" */
+
+ /*
+ * In Linux, all terminal parameters are intended to be sticky.
+ * as a result, we "remove" the code which once reset the ports
+ * to sane values.
+ */
+
+ drp_param(ch);
+
+ }
+
+ un->un_flag |= UN_INITIALIZED;
+
+ retval = 0;
+
+unlock:
+
+ spin_unlock_irqrestore(&nd->nd_lock, lock_flags);
+
+done:
+ /*
+ * Linux does a close for every open, even failed ones!
+ */
+ if (!counts_were_incremented) {
+ un->un_open_count++;
+ ch->ch_open_count++;
+ }
+
+ if (retval)
+ dev_err(tty->dev, "tty open bad return (%i)\n", retval);
+
+ return retval;
+}
+
+
+
+
+/*
+ * dgrp_tty_close() -- close function for tty_operations
+ */
+static void dgrp_tty_close(struct tty_struct *tty, struct file *file)
+{
+ struct ch_struct *ch;
+ struct un_struct *un;
+ struct nd_struct *nd;
+ int tpos;
+ int port;
+ int err = 0;
+ int s = 0;
+ ulong waketime;
+ ulong lock_flags;
+ int sent_printer_offstr = 0;
+
+ port = PORT_NUM(MINOR(tty_devnum(tty)));
+
+ un = tty->driver_data;
+
+ if (!un)
+ return;
+
+ ch = un->un_ch;
+
+ if (!ch)
+ return;
+
+ nd = ch->ch_nd;
+
+ if (!nd)
+ return;
+
+ spin_lock_irqsave(&nd->nd_lock, lock_flags);
+
+
+ /* Used to be on channel basis, now we check on a unit basis. */
+ if (un->un_open_count != 1)
+ goto unlock;
+
+ /*
+ * OK, its the last close on the unit
+ */
+ un->un_flag |= UN_CLOSING;
+
+ /*
+ * Notify the discipline to only process XON/XOFF characters.
+ */
+ tty->closing = 1;
+
+ /*
+ * Wait for output to drain only if this is
+ * the last close against the channel
+ */
+
+ if (ch->ch_open_count == 1) {
+ /*
+ * If its the print device, we need to ensure at all costs that
+ * the offstr will fit. If it won't, flush our tbuf.
+ */
+ if (IS_PRINT(MINOR(tty_devnum(tty))) &&
+ (((ch->ch_tout - ch->ch_tin - 1) & TBUF_MASK) <
+ ch->ch_digi.digi_offlen))
+ ch->ch_tin = ch->ch_tout;
+
+ /*
+ * Turn off the printer. Don't bother checking to see if its
+ * IS_PRINT... Since this is the last close the flag is going
+ * to be cleared, so we MUST make sure the offstr gets inserted
+ * into tbuf.
+ */
+
+ if ((ch->ch_flag & CH_PRON) != 0) {
+ drp_wmove(ch, 0, ch->ch_digi.digi_offstr,
+ ch->ch_digi.digi_offlen);
+ ch->ch_flag &= ~CH_PRON;
+ sent_printer_offstr = 1;
+ }
+ }
+
+ /*
+ * Wait until either the output queue has drained, or we see
+ * absolutely no progress for 15 seconds.
+ */
+
+ tpos = ch->ch_s_tpos;
+
+ waketime = jiffies + 15 * HZ;
+
+ for (;;) {
+
+ /*
+ * Make sure the port still exists.
+ */
+
+ if (port >= nd->nd_chan_count) {
+ err = 1;
+ break;
+ }
+
+ if (signal_pending(current)) {
+ err = 1;
+ break;
+ }
+
+ /*
+ * If the port is idle (not opened on the server), we have
+ * no way of draining/flushing/closing the port on that server.
+ * So break out of loop.
+ */
+ if (ch->ch_state == CS_IDLE)
+ break;
+
+ nd->nd_tx_work = 1;
+
+ /*
+ * Exit if the queues for this unit are empty,
+ * and either the other unit is still open or all
+ * data has drained.
+ */
+
+ if ((un->un_tty)->ops->chars_in_buffer ?
+ ((un->un_tty)->ops->chars_in_buffer)(un->un_tty) == 0 : 1) {
+
+ /*
+ * We don't need to wait for a buffer to drain
+ * if the other unit is open.
+ */
+
+ if (ch->ch_open_count != un->un_open_count)
+ break;
+
+ /*
+ * The wait is complete when all queues are
+ * drained, and any break in progress is complete.
+ */
+
+ if (ch->ch_tin == ch->ch_tout &&
+ ch->ch_s_tin == ch->ch_s_tpos &&
+ (ch->ch_send & RR_TX_BREAK) == 0) {
+ break;
+ }
+ }
+
+ /*
+ * Flush TX data and exit the wait if NDELAY is set,
+ * or this is not a DIGI printer, and the close timeout
+ * expires.
+ */
+
+ if ((file->f_flags & (O_NDELAY | O_NONBLOCK)) ||
+ ((long)(jiffies - waketime) >= 0 &&
+ (ch->ch_digi.digi_flags & DIGI_PRINTER) == 0)) {
+
+ /*
+ * If we sent the printer off string, we cannot
+ * flush our internal buffers, or we might lose
+ * the offstr.
+ */
+ if (!sent_printer_offstr)
+ dgrp_tty_flush_buffer(tty);
+
+ tty_ldisc_flush(tty);
+ break;
+ }
+
+ /*
+ * Otherwise take a short nap.
+ */
+
+ ch->ch_flag |= CH_DRAIN;
+
+ spin_unlock_irqrestore(&nd->nd_lock, lock_flags);
+
+ schedule_timeout_interruptible(1);
+ s = signal_pending(current);
+
+ spin_lock_irqsave(&nd->nd_lock, lock_flags);
+
+ if (s) {
+ /*
+ * If we had sent the printer off string, we now have
+ * some problems.
+ *
+ * The system won't let us sleep since we got an error
+ * back from sleep, presumably because the user did
+ * a ctrl-c...
+ * But we need to ensure that the offstr gets sent!
+ * Thus, we have to do something else besides sleeping.
+ * The plan:
+ * 1) Make this task uninterruptable.
+ * 2) Set up a timer to go off in 1 sec.
+ * 3) Act as tho we just got out of the sleep above.
+ *
+ * Thankfully, in the real world, this just
+ * never happens.
+ */
+
+ if (sent_printer_offstr) {
+ spin_unlock_irqrestore(&nd->nd_lock,
+ lock_flags);
+ drp_my_sleep(ch);
+ spin_lock_irqsave(&nd->nd_lock, lock_flags);
+ } else {
+ err = 1;
+ break;
+ }
+ }
+
+ /*
+ * Restart the wait if any progress is seen.
+ */
+
+ if (ch->ch_s_tpos != tpos) {
+ tpos = ch->ch_s_tpos;
+
+ /* TODO: this gives us timeout problems with nist ?? */
+ waketime = jiffies + 15 * HZ;
+ }
+ }
+
+ /*
+ * Close the line discipline
+ */
+
+ /* this is done in tty_io.c */
+ /* if ((un->un_tty)->ldisc.close)
+ * ((un->un_tty)->ldisc.close)(un->un_tty);
+ */
+
+ /* don't do this here */
+ /* un->un_flag = 0; */
+
+ /*
+ * Flush the receive buffer on terminal unit close only.
+ */
+
+ if (!IS_PRINT(MINOR(tty_devnum(tty))))
+ ch->ch_rout = ch->ch_rin;
+
+
+ /*
+ * Don't permit the close to happen until we get any pending
+ * sync request responses.
+ * There could be other ports depending upon the response as well.
+ *
+ * Also, don't permit the close to happen until any parameter
+ * changes have been sent out from the state machine as well.
+ * This is required because of a ditty -a race with -HUPCL
+ * We MUST make sure all channel parameters have been sent to the
+ * Portserver before sending a close.
+ */
+
+ if ((err != 1) && (ch->ch_state != CS_IDLE)) {
+ spin_unlock_irqrestore(&nd->nd_lock, lock_flags);
+ s = wait_event_interruptible(ch->ch_flag_wait,
+ ((ch->ch_flag & (CH_WAITING_SYNC | CH_PARAM)) == 0));
+ spin_lock_irqsave(&nd->nd_lock, lock_flags);
+ }
+
+ /*
+ * Cleanup the channel if last unit open.
+ */
+
+ if (ch->ch_open_count == 1) {
+ ch->ch_flag = 0;
+ ch->ch_category = 0;
+ ch->ch_send = 0;
+ ch->ch_expect = 0;
+ ch->ch_tout = ch->ch_tin;
+ /* (un->un_tty)->device = 0; */
+
+ if (ch->ch_state == CS_READY)
+ ch->ch_state = CS_SEND_CLOSE;
+ }
+
+ /*
+ * Send the changes to the server
+ */
+ if (ch->ch_state != CS_IDLE) {
+ ch->ch_flag |= CH_PARAM;
+ wake_up_interruptible(&ch->ch_flag_wait);
+ }
+
+ nd->nd_tx_work = 1;
+ nd->nd_tx_ready = 1;
+
+unlock:
+ tty->closing = 0;
+
+ if (ch->ch_open_count <= 0)
+ dev_info(tty->dev,
+ "%s - unexpected value for ch->ch_open_count: %i\n",
+ __func__, ch->ch_open_count);
+ else
+ ch->ch_open_count--;
+
+ if (un->un_open_count <= 0)
+ dev_info(tty->dev,
+ "%s - unexpected value for un->un_open_count: %i\n",
+ __func__, un->un_open_count);
+ else
+ un->un_open_count--;
+
+ un->un_flag &= ~(UN_NORMAL_ACTIVE | UN_CALLOUT_ACTIVE | UN_CLOSING);
+ if (waitqueue_active(&un->un_close_wait))
+ wake_up_interruptible(&un->un_close_wait);
+
+ spin_unlock_irqrestore(&nd->nd_lock, lock_flags);
+
+ return;
+
+}
+
+static void drp_wmove(struct ch_struct *ch, int from_user, void *buf, int count)
+{
+ int n;
+ int ret = 0;
+
+ ch->ch_nd->nd_tx_work = 1;
+
+ n = TBUF_MAX - ch->ch_tin;
+
+ if (count >= n) {
+ if (from_user)
+ ret = copy_from_user(ch->ch_tbuf + ch->ch_tin,
+ (void __user *) buf, n);
+ else
+ memcpy(ch->ch_tbuf + ch->ch_tin, buf, n);
+
+ buf = (char *) buf + n;
+ count -= n;
+ ch->ch_tin = 0;
+ }
+
+ if (from_user)
+ ret = copy_from_user(ch->ch_tbuf + ch->ch_tin,
+ (void __user *) buf, count);
+ else
+ memcpy(ch->ch_tbuf + ch->ch_tin, buf, count);
+
+ ch->ch_tin += count;
+}
+
+
+static int dgrp_calculate_txprint_bounds(struct ch_struct *ch, int space,
+ int *un_flag)
+{
+ clock_t tt;
+ clock_t mt;
+ unsigned short tmax = 0;
+
+ /*
+ * If the terminal device is busy, reschedule when
+ * the terminal device becomes idle.
+ */
+
+ if (ch->ch_tun.un_open_count != 0 &&
+ ch->ch_tun.un_tty->ops->chars_in_buffer &&
+ ((ch->ch_tun.un_tty->ops->chars_in_buffer)(ch->ch_tun.un_tty) != 0)) {
+ *un_flag = UN_PWAIT;
+ return 0;
+ }
+
+ /*
+ * Assure that whenever there is printer data in the output
+ * buffer, there always remains enough space after it to
+ * turn the printer off.
+ */
+ space -= ch->ch_digi.digi_offlen;
+
+ if (space <= 0) {
+ *un_flag = UN_EMPTY;
+ return 0;
+ }
+
+ /*
+ * We measure printer CPS speed by incrementing
+ * ch_cpstime by (HZ / digi_maxcps) for every
+ * character we output, restricting output so
+ * that ch_cpstime never exceeds lbolt.
+ *
+ * However if output has not been done for some
+ * time, lbolt will grow to very much larger than
+ * ch_cpstime, which would allow essentially
+ * unlimited amounts of output until ch_cpstime
+ * finally caught up. To avoid this, we adjust
+ * cps_time when necessary so the difference
+ * between lbolt and ch_cpstime never results
+ * in sending more than digi_bufsize characters.
+ *
+ * This nicely models a printer with an internal
+ * buffer of digi_bufsize characters.
+ *
+ * Get the time between lbolt and ch->ch_cpstime;
+ */
+
+ tt = jiffies - ch->ch_cpstime;
+
+ /*
+ * Compute the time required to send digi_bufsize
+ * characters.
+ */
+
+ mt = HZ * ch->ch_digi.digi_bufsize / ch->ch_digi.digi_maxcps;
+
+ /*
+ * Compute the number of characters that can be sent
+ * without violating the time constraint. If the
+ * direct calculation of this number is bigger than
+ * digi_bufsize, limit the number to digi_bufsize,
+ * and adjust cpstime to match.
+ */
+
+ if ((clock_t)(tt + HZ) > (clock_t)(mt + HZ)) {
+ tmax = ch->ch_digi.digi_bufsize;
+ ch->ch_cpstime = jiffies - mt;
+ } else {
+ tmax = ch->ch_digi.digi_maxcps * tt / HZ;
+ }
+
+ /*
+ * If the time constraint now binds, limit the transmit
+ * count accordingly, and tentatively arrange to be
+ * rescheduled based on time.
+ */
+
+ if (tmax < space) {
+ *un_flag = UN_TIME;
+ space = tmax;
+ }
+
+ /*
+ * Compute the total number of characters we can
+ * output before the total number of characters known
+ * to be in the output queue exceeds digi_maxchar.
+ */
+
+ tmax = (ch->ch_digi.digi_maxchar -
+ ((ch->ch_tin - ch->ch_tout) & TBUF_MASK) -
+ ((ch->ch_s_tin - ch->ch_s_tpos) & 0xffff));
+
+
+ /*
+ * If the digi_maxchar constraint now holds, limit
+ * the transmit count accordingly, and arrange to
+ * be rescheduled when the queue becomes empty.
+ */
+
+ if (space > tmax) {
+ *un_flag = UN_EMPTY;
+ space = tmax;
+ }
+
+ if (space <= 0)
+ *un_flag |= UN_EMPTY;
+
+ return space;
+}
+
+
+static int dgrp_tty_write(struct tty_struct *tty,
+ const unsigned char *buf,
+ int count)
+{
+ struct nd_struct *nd;
+ struct un_struct *un;
+ struct ch_struct *ch;
+ int space;
+ int n;
+ int t;
+ int sendcount;
+ int un_flag;
+ ulong lock_flags;
+
+ if (tty == NULL)
+ return 0;
+
+ un = tty->driver_data;
+ if (!un)
+ return 0;
+
+ ch = un->un_ch;
+ if (!ch)
+ return 0;
+
+ nd = ch->ch_nd;
+ if (!nd)
+ return 0;
+
+ /*
+ * Ignore the request if the channel is not ready.
+ */
+ if (ch->ch_state != CS_READY)
+ return 0;
+
+ spin_lock_irqsave(&dgrp_poll_data.poll_lock, lock_flags);
+
+ /*
+ * Ignore the request if output is blocked.
+ */
+ if ((un->un_flag & (UN_EMPTY | UN_LOW | UN_TIME | UN_PWAIT)) != 0) {
+ count = 0;
+ goto out;
+ }
+
+ /*
+ * Also ignore the request if DPA has this port open,
+ * and is flow controlled on reading more data.
+ */
+ if (nd->nd_dpa_debug && nd->nd_dpa_flag & DPA_WAIT_SPACE &&
+ nd->nd_dpa_port == MINOR(tty_devnum(ch->ch_tun.un_tty))) {
+ count = 0;
+ goto out;
+ }
+
+ /*
+ * Limit amount we will write to the amount of space
+ * available in the channel buffer.
+ */
+ sendcount = 0;
+
+ space = (ch->ch_tout - ch->ch_tin - 1) & TBUF_MASK;
+
+ /*
+ * Handle the printer device.
+ */
+
+ un_flag = UN_LOW;
+
+ if (IS_PRINT(MINOR(tty_devnum(tty)))) {
+ clock_t tt;
+ clock_t mt;
+ unsigned short tmax = 0;
+
+ /*
+ * If the terminal device is busy, reschedule when
+ * the terminal device becomes idle.
+ */
+
+ if (ch->ch_tun.un_open_count != 0 &&
+ ((ch->ch_tun.un_tty->ops->chars_in_buffer)(ch->ch_tun.un_tty) != 0)) {
+ un->un_flag |= UN_PWAIT;
+ count = 0;
+ goto out;
+ }
+
+ /*
+ * Assure that whenever there is printer data in the output
+ * buffer, there always remains enough space after it to
+ * turn the printer off.
+ */
+ space -= ch->ch_digi.digi_offlen;
+
+ /*
+ * Output the printer on string.
+ */
+
+ if ((ch->ch_flag & CH_PRON) == 0) {
+ space -= ch->ch_digi.digi_onlen;
+
+ if (space < 0) {
+ un->un_flag |= UN_EMPTY;
+ (ch->ch_nd)->nd_tx_work = 1;
+ count = 0;
+ goto out;
+ }
+
+ drp_wmove(ch, 0, ch->ch_digi.digi_onstr,
+ ch->ch_digi.digi_onlen);
+
+ ch->ch_flag |= CH_PRON;
+ }
+
+ /*
+ * We measure printer CPS speed by incrementing
+ * ch_cpstime by (HZ / digi_maxcps) for every
+ * character we output, restricting output so
+ * that ch_cpstime never exceeds lbolt.
+ *
+ * However if output has not been done for some
+ * time, lbolt will grow to very much larger than
+ * ch_cpstime, which would allow essentially
+ * unlimited amounts of output until ch_cpstime
+ * finally caught up. To avoid this, we adjust
+ * cps_time when necessary so the difference
+ * between lbolt and ch_cpstime never results
+ * in sending more than digi_bufsize characters.
+ *
+ * This nicely models a printer with an internal
+ * buffer of digi_bufsize characters.
+ *
+ * Get the time between lbolt and ch->ch_cpstime;
+ */
+
+ tt = jiffies - ch->ch_cpstime;
+
+ /*
+ * Compute the time required to send digi_bufsize
+ * characters.
+ */
+
+ mt = HZ * ch->ch_digi.digi_bufsize / ch->ch_digi.digi_maxcps;
+
+ /*
+ * Compute the number of characters that can be sent
+ * without violating the time constraint. If the
+ * direct calculation of this number is bigger than
+ * digi_bufsize, limit the number to digi_bufsize,
+ * and adjust cpstime to match.
+ */
+
+ if ((clock_t)(tt + HZ) > (clock_t)(mt + HZ)) {
+ tmax = ch->ch_digi.digi_bufsize;
+ ch->ch_cpstime = jiffies - mt;
+ } else {
+ tmax = ch->ch_digi.digi_maxcps * tt / HZ;
+ }
+
+ /*
+ * If the time constraint now binds, limit the transmit
+ * count accordingly, and tentatively arrange to be
+ * rescheduled based on time.
+ */
+
+ if (tmax < space) {
+ space = tmax;
+ un_flag = UN_TIME;
+ }
+
+ /*
+ * Compute the total number of characters we can
+ * output before the total number of characters known
+ * to be in the output queue exceeds digi_maxchar.
+ */
+
+ tmax = (ch->ch_digi.digi_maxchar -
+ ((ch->ch_tin - ch->ch_tout) & TBUF_MASK) -
+ ((ch->ch_s_tin - ch->ch_s_tpos) & 0xffff));
+
+
+ /*
+ * If the digi_maxchar constraint now holds, limit
+ * the transmit count accordingly, and arrange to
+ * be rescheduled when the queue becomes empty.
+ */
+
+ if (space > tmax) {
+ space = tmax;
+ un_flag = UN_EMPTY;
+ }
+
+ }
+ /*
+ * Handle the terminal device.
+ */
+ else {
+
+ /*
+ * If the printer device is on, turn it off.
+ */
+
+ if ((ch->ch_flag & CH_PRON) != 0) {
+
+ space -= ch->ch_digi.digi_offlen;
+
+ drp_wmove(ch, 0, ch->ch_digi.digi_offstr,
+ ch->ch_digi.digi_offlen);
+
+ ch->ch_flag &= ~CH_PRON;
+ }
+ }
+
+ /*
+ * If space is 0 and its because the ch->tbuf
+ * is full, then Linux will handle a callback when queue
+ * space becomes available.
+ * tty_write returns count = 0
+ */
+
+ if (space <= 0) {
+ /* the linux tty_io.c handles this if we return 0 */
+ /* if (fp->flags & O_NONBLOCK) return -EAGAIN; */
+
+ un->un_flag |= UN_EMPTY;
+ (ch->ch_nd)->nd_tx_work = 1;
+ count = 0;
+ goto out;
+ }
+
+ count = min(count, space);
+
+ if (count > 0) {
+
+ un->un_tbusy++;
+
+ /*
+ * Copy the buffer contents to the ch_tbuf
+ * being careful to wrap around the circular queue
+ */
+
+ t = TBUF_MAX - ch->ch_tin;
+ n = count;
+
+ if (n >= t) {
+ memcpy(ch->ch_tbuf + ch->ch_tin, buf, t);
+ if (nd->nd_dpa_debug && nd->nd_dpa_port == PORT_NUM(MINOR(tty_devnum(un->un_tty))))
+ dgrp_dpa_data(nd, 0, (char *) buf, t);
+ buf += t;
+ n -= t;
+ ch->ch_tin = 0;
+ sendcount += n;
+ }
+
+ memcpy(ch->ch_tbuf + ch->ch_tin, buf, n);
+ if (nd->nd_dpa_debug && nd->nd_dpa_port == PORT_NUM(MINOR(tty_devnum(un->un_tty))))
+ dgrp_dpa_data(nd, 0, (char *) buf, n);
+ buf += n;
+ ch->ch_tin += n;
+ sendcount += n;
+
+ un->un_tbusy--;
+ (ch->ch_nd)->nd_tx_work = 1;
+ if (ch->ch_edelay != DGRP_RTIME) {
+ (ch->ch_nd)->nd_tx_ready = 1;
+ wake_up_interruptible(&nd->nd_tx_waitq);
+ }
+ }
+
+ ch->ch_txcount += count;
+
+ if (IS_PRINT(MINOR(tty_devnum(tty)))) {
+
+ /*
+ * Adjust ch_cpstime to account
+ * for the characters just output.
+ */
+
+ if (sendcount > 0) {
+ int cc = HZ * sendcount + ch->ch_cpsrem;
+
+ ch->ch_cpstime += cc / ch->ch_digi.digi_maxcps;
+ ch->ch_cpsrem = cc % ch->ch_digi.digi_maxcps;
+ }
+
+ /*
+ * If we are now waiting on time, schedule ourself
+ * back when we'll be able to send a block of
+ * digi_maxchar characters.
+ */
+
+ if ((un_flag & UN_TIME) != 0) {
+ ch->ch_waketime = (ch->ch_cpstime +
+ (ch->ch_digi.digi_maxchar * HZ /
+ ch->ch_digi.digi_maxcps));
+ }
+ }
+
+ /*
+ * If the printer unit is waiting for completion
+ * of terminal output, get him going again.
+ */
+
+ if ((ch->ch_pun.un_flag & UN_PWAIT) != 0)
+ (ch->ch_nd)->nd_tx_work = 1;
+
+out:
+ spin_unlock_irqrestore(&dgrp_poll_data.poll_lock, lock_flags);
+
+ return count;
+}
+
+
+/*
+ * Put a character into ch->ch_buf
+ *
+ * - used by the line discipline for OPOST processing
+ */
+
+static int dgrp_tty_put_char(struct tty_struct *tty, unsigned char new_char)
+{
+ struct un_struct *un;
+ struct ch_struct *ch;
+ ulong lock_flags;
+ int space;
+ int retval = 0;
+
+ if (tty == NULL)
+ return 0;
+
+ un = tty->driver_data;
+ if (!un)
+ return 0;
+
+ ch = un->un_ch;
+ if (!ch)
+ return 0;
+
+ if (ch->ch_state != CS_READY)
+ return 0;
+
+ spin_lock_irqsave(&dgrp_poll_data.poll_lock, lock_flags);
+
+
+ /*
+ * If space is 0 and its because the ch->tbuf
+ * Warn and dump the character, there isn't anything else
+ * we can do about it. David_Fries@digi.com
+ */
+
+ space = (ch->ch_tout - ch->ch_tin - 1) & TBUF_MASK;
+
+ un->un_tbusy++;
+
+ /*
+ * Output the printer on string if device is TXPrint.
+ */
+ if (IS_PRINT(MINOR(tty_devnum(tty))) && (ch->ch_flag & CH_PRON) == 0) {
+ if (space < ch->ch_digi.digi_onlen) {
+ un->un_tbusy--;
+ goto out;
+ }
+ space -= ch->ch_digi.digi_onlen;
+ drp_wmove(ch, 0, ch->ch_digi.digi_onstr,
+ ch->ch_digi.digi_onlen);
+ ch->ch_flag |= CH_PRON;
+ }
+
+ /*
+ * Output the printer off string if device is NOT TXPrint.
+ */
+
+ if (!IS_PRINT(MINOR(tty_devnum(tty))) &&
+ ((ch->ch_flag & CH_PRON) != 0)) {
+ if (space < ch->ch_digi.digi_offlen) {
+ un->un_tbusy--;
+ goto out;
+ }
+
+ space -= ch->ch_digi.digi_offlen;
+ drp_wmove(ch, 0, ch->ch_digi.digi_offstr,
+ ch->ch_digi.digi_offlen);
+ ch->ch_flag &= ~CH_PRON;
+ }
+
+ if (!space) {
+ un->un_tbusy--;
+ goto out;
+ }
+
+ /*
+ * Copy the character to the ch_tbuf being
+ * careful to wrap around the circular queue
+ */
+ ch->ch_tbuf[ch->ch_tin] = new_char;
+ ch->ch_tin = (1 + ch->ch_tin) & TBUF_MASK;
+
+ if (IS_PRINT(MINOR(tty_devnum(tty)))) {
+
+ /*
+ * Adjust ch_cpstime to account
+ * for the character just output.
+ */
+
+ int cc = HZ + ch->ch_cpsrem;
+
+ ch->ch_cpstime += cc / ch->ch_digi.digi_maxcps;
+ ch->ch_cpsrem = cc % ch->ch_digi.digi_maxcps;
+
+ /*
+ * If we are now waiting on time, schedule ourself
+ * back when we'll be able to send a block of
+ * digi_maxchar characters.
+ */
+
+ ch->ch_waketime = (ch->ch_cpstime +
+ (ch->ch_digi.digi_maxchar * HZ /
+ ch->ch_digi.digi_maxcps));
+ }
+
+
+ un->un_tbusy--;
+ (ch->ch_nd)->nd_tx_work = 1;
+
+ retval = 1;
+out:
+ spin_unlock_irqrestore(&dgrp_poll_data.poll_lock, lock_flags);
+ return retval;
+}
+
+
+
+/*
+ * Flush TX buffer (make in == out)
+ *
+ * check tty_ioctl.c -- this is called after TCOFLUSH
+ */
+static void dgrp_tty_flush_buffer(struct tty_struct *tty)
+{
+ struct un_struct *un;
+ struct ch_struct *ch;
+
+ if (!tty)
+ return;
+ un = tty->driver_data;
+ if (!un)
+ return;
+
+ ch = un->un_ch;
+ if (!ch)
+ return;
+
+ ch->ch_tout = ch->ch_tin;
+ /* do NOT do this here! */
+ /* ch->ch_s_tpos = ch->ch_s_tin = 0; */
+
+ /* send the flush output command now */
+ ch->ch_send |= RR_TX_FLUSH;
+ (ch->ch_nd)->nd_tx_ready = 1;
+ (ch->ch_nd)->nd_tx_work = 1;
+ wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
+
+ if (waitqueue_active(&tty->write_wait))
+ wake_up_interruptible(&tty->write_wait);
+
+ tty_wakeup(tty);
+
+}
+
+/*
+ * Return space available in Tx buffer
+ * count = ( ch->ch_tout - ch->ch_tin ) mod (TBUF_MAX - 1)
+ */
+static int dgrp_tty_write_room(struct tty_struct *tty)
+{
+ struct un_struct *un;
+ struct ch_struct *ch;
+ int count;
+
+ if (!tty)
+ return 0;
+
+ un = tty->driver_data;
+ if (!un)
+ return 0;
+
+ ch = un->un_ch;
+ if (!ch)
+ return 0;
+
+ count = (ch->ch_tout - ch->ch_tin - 1) & TBUF_MASK;
+
+ /* We *MUST* check this, and return 0 if the Printer Unit cannot
+ * take any more data within its time constraints... If we don't
+ * return 0 and the printer has hit it time constraint, the ld will
+ * call us back doing a put_char, which cannot be rejected!!!
+ */
+ if (IS_PRINT(MINOR(tty_devnum(tty)))) {
+ int un_flag = 0;
+ count = dgrp_calculate_txprint_bounds(ch, count, &un_flag);
+ if (count <= 0)
+ count = 0;
+
+ ch->ch_pun.un_flag |= un_flag;
+ (ch->ch_nd)->nd_tx_work = 1;
+ }
+
+ return count;
+}
+
+/*
+ * Return number of characters that have not been transmitted yet.
+ * chars_in_buffer = ( ch->ch_tin - ch->ch_tout ) mod (TBUF_MAX - 1)
+ * + ( ch->ch_s_tin - ch->ch_s_tout ) mod (0xffff)
+ * = number of characters "in transit"
+ *
+ * Remember that sequence number math is always with a sixteen bit
+ * mask, not the TBUF_MASK.
+ */
+
+static int dgrp_tty_chars_in_buffer(struct tty_struct *tty)
+{
+ struct un_struct *un;
+ struct ch_struct *ch;
+ int count;
+ int count1;
+
+ if (!tty)
+ return 0;
+
+ un = tty->driver_data;
+ if (!un)
+ return 0;
+
+ ch = un->un_ch;
+ if (!ch)
+ return 0;
+
+ count1 = count = (ch->ch_tin - ch->ch_tout) & TBUF_MASK;
+ count += (ch->ch_s_tin - ch->ch_s_tpos) & 0xffff;
+ /* one for tbuf, one for the PS */
+
+ /*
+ * If we are busy transmitting add 1
+ */
+ count += un->un_tbusy;
+
+ return count;
+}
+
+
+/*****************************************************************************
+ *
+ * Helper applications for dgrp_tty_ioctl()
+ *
+ *****************************************************************************
+ */
+
+
+/**
+ * ch_to_tty_flags() -- convert channel flags to termio flags
+ * @ch_flag: Digi channel flags
+ * @flagtype: type of ch_flag (iflag, oflag or cflag)
+ *
+ * take the channel flags of the specified type and return the
+ * corresponding termio flag
+ */
+static tcflag_t ch_to_tty_flags(ushort ch_flag, char flagtype)
+{
+ tcflag_t retval = 0;
+
+ switch (flagtype) {
+ case 'i':
+ retval = ((ch_flag & IF_IGNBRK) ? IGNBRK : 0)
+ | ((ch_flag & IF_BRKINT) ? BRKINT : 0)
+ | ((ch_flag & IF_IGNPAR) ? IGNPAR : 0)
+ | ((ch_flag & IF_PARMRK) ? PARMRK : 0)
+ | ((ch_flag & IF_INPCK) ? INPCK : 0)
+ | ((ch_flag & IF_ISTRIP) ? ISTRIP : 0)
+ | ((ch_flag & IF_IXON) ? IXON : 0)
+ | ((ch_flag & IF_IXANY) ? IXANY : 0)
+ | ((ch_flag & IF_IXOFF) ? IXOFF : 0);
+ break;
+
+ case 'o':
+ retval = ((ch_flag & OF_OLCUC) ? OLCUC : 0)
+ | ((ch_flag & OF_ONLCR) ? ONLCR : 0)
+ | ((ch_flag & OF_OCRNL) ? OCRNL : 0)
+ | ((ch_flag & OF_ONOCR) ? ONOCR : 0)
+ | ((ch_flag & OF_ONLRET) ? ONLRET : 0)
+ /* | ((ch_flag & OF_OTAB3) ? OFILL : 0) */
+ | ((ch_flag & OF_TABDLY) ? TABDLY : 0);
+ break;
+
+ case 'c':
+ retval = ((ch_flag & CF_CSTOPB) ? CSTOPB : 0)
+ | ((ch_flag & CF_CREAD) ? CREAD : 0)
+ | ((ch_flag & CF_PARENB) ? PARENB : 0)
+ | ((ch_flag & CF_PARODD) ? PARODD : 0)
+ | ((ch_flag & CF_HUPCL) ? HUPCL : 0);
+
+ switch (ch_flag & CF_CSIZE) {
+ case CF_CS5:
+ retval |= CS5;
+ break;
+ case CF_CS6:
+ retval |= CS6;
+ break;
+ case CF_CS7:
+ retval |= CS7;
+ break;
+ case CF_CS8:
+ retval |= CS8;
+ break;
+ default:
+ retval |= CS8;
+ break;
+ }
+ break;
+ case 'x':
+ break;
+ case 'l':
+ break;
+ default:
+ return 0;
+ }
+
+ return retval;
+}
+
+
+/**
+ * tty_to_ch_flags() -- convert termio flags to digi channel flags
+ * @tty: pointer to a TTY structure holding flag to be converted
+ * @flagtype: identifies which flag (iflags, oflags, or cflags) should
+ * be converted
+ *
+ * take the termio flag of the specified type and return the
+ * corresponding Digi version of the flags
+ */
+static ushort tty_to_ch_flags(struct tty_struct *tty, char flagtype)
+{
+ ushort retval = 0;
+ tcflag_t tflag = 0;
+
+ switch (flagtype) {
+ case 'i':
+ tflag = tty->termios.c_iflag;
+ retval = (I_IGNBRK(tty) ? IF_IGNBRK : 0)
+ | (I_BRKINT(tty) ? IF_BRKINT : 0)
+ | (I_IGNPAR(tty) ? IF_IGNPAR : 0)
+ | (I_PARMRK(tty) ? IF_PARMRK : 0)
+ | (I_INPCK(tty) ? IF_INPCK : 0)
+ | (I_ISTRIP(tty) ? IF_ISTRIP : 0)
+ | (I_IXON(tty) ? IF_IXON : 0)
+ | (I_IXANY(tty) ? IF_IXANY : 0)
+ | (I_IXOFF(tty) ? IF_IXOFF : 0);
+ break;
+ case 'o':
+ tflag = tty->termios.c_oflag;
+ /*
+ * If OPOST is set, then do the post processing in the
+ * firmware by setting all the processing flags on.
+ * If ~OPOST, then make sure we are not doing any
+ * output processing!!
+ */
+ if (!O_OPOST(tty))
+ retval = 0;
+ else
+ retval = (O_OLCUC(tty) ? OF_OLCUC : 0)
+ | (O_ONLCR(tty) ? OF_ONLCR : 0)
+ | (O_OCRNL(tty) ? OF_OCRNL : 0)
+ | (O_ONOCR(tty) ? OF_ONOCR : 0)
+ | (O_ONLRET(tty) ? OF_ONLRET : 0)
+ /* | (O_OFILL(tty) ? OF_TAB3 : 0) */
+ | (O_TABDLY(tty) ? OF_TABDLY : 0);
+ break;
+ case 'c':
+ tflag = tty->termios.c_cflag;
+ retval = (C_CSTOPB(tty) ? CF_CSTOPB : 0)
+ | (C_CREAD(tty) ? CF_CREAD : 0)
+ | (C_PARENB(tty) ? CF_PARENB : 0)
+ | (C_PARODD(tty) ? CF_PARODD : 0)
+ | (C_HUPCL(tty) ? CF_HUPCL : 0);
+ switch (C_CSIZE(tty)) {
+ case CS8:
+ retval |= CF_CS8;
+ break;
+ case CS7:
+ retval |= CF_CS7;
+ break;
+ case CS6:
+ retval |= CF_CS6;
+ break;
+ case CS5:
+ retval |= CF_CS5;
+ break;
+ default:
+ retval |= CF_CS8;
+ break;
+ }
+ break;
+ case 'x':
+ break;
+ case 'l':
+ break;
+ default:
+ return 0;
+ }
+
+ return retval;
+}
+
+
+static int dgrp_tty_send_break(struct tty_struct *tty, int msec)
+{
+ struct un_struct *un;
+ struct ch_struct *ch;
+ int ret = -EIO;
+
+ if (!tty)
+ return ret;
+
+ un = tty->driver_data;
+ if (!un)
+ return ret;
+
+ ch = un->un_ch;
+ if (!ch)
+ return ret;
+
+ dgrp_send_break(ch, msec);
+ return 0;
+}
+
+
+/*
+ * This routine sends a break character out the serial port.
+ *
+ * duration is in 1/1000's of a second
+ */
+static int dgrp_send_break(struct ch_struct *ch, int msec)
+{
+ ulong x;
+
+ wait_event_interruptible(ch->ch_flag_wait,
+ ((ch->ch_flag & CH_TX_BREAK) == 0));
+ ch->ch_break_time += max(msec, 250);
+ ch->ch_send |= RR_TX_BREAK;
+ ch->ch_flag |= CH_TX_BREAK;
+ (ch->ch_nd)->nd_tx_work = 1;
+
+ x = (msec * HZ) / 1000;
+ wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
+
+ return 0;
+}
+
+
+/*
+ * Return modem signals to ld.
+ */
+static int dgrp_tty_tiocmget(struct tty_struct *tty)
+{
+ unsigned int mlast;
+ struct un_struct *un = tty->driver_data;
+ struct ch_struct *ch;
+
+ if (!un)
+ return -ENODEV;
+
+ ch = un->un_ch;
+ if (!ch)
+ return -ENODEV;
+
+ mlast = ((ch->ch_s_mlast & ~(DM_RTS | DM_DTR)) |
+ (ch->ch_mout & (DM_RTS | DM_DTR)));
+
+ /* defined in /usr/include/asm/termios.h */
+ mlast = ((mlast & DM_RTS) ? TIOCM_RTS : 0)
+ | ((mlast & DM_DTR) ? TIOCM_DTR : 0)
+ | ((mlast & DM_CD) ? TIOCM_CAR : 0)
+ | ((mlast & DM_RI) ? TIOCM_RNG : 0)
+ | ((mlast & DM_DSR) ? TIOCM_DSR : 0)
+ | ((mlast & DM_CTS) ? TIOCM_CTS : 0);
+
+ return mlast;
+}
+
+
+/*
+ * Set modem lines
+ */
+static int dgrp_tty_tiocmset(struct tty_struct *tty,
+ unsigned int set, unsigned int clear)
+{
+ ulong lock_flags;
+ struct un_struct *un = tty->driver_data;
+ struct ch_struct *ch;
+
+ if (!un)
+ return -ENODEV;
+
+ ch = un->un_ch;
+ if (!ch)
+ return -ENODEV;
+
+ if (set & TIOCM_RTS)
+ ch->ch_mout |= DM_RTS;
+
+ if (set & TIOCM_DTR)
+ ch->ch_mout |= DM_DTR;
+
+ if (clear & TIOCM_RTS)
+ ch->ch_mout &= ~(DM_RTS);
+
+ if (clear & TIOCM_DTR)
+ ch->ch_mout &= ~(DM_DTR);
+
+ spin_lock_irqsave(&(ch->ch_nd)->nd_lock, lock_flags);
+ ch->ch_flag |= CH_PARAM;
+ (ch->ch_nd)->nd_tx_work = 1;
+ wake_up_interruptible(&ch->ch_flag_wait);
+
+ spin_unlock_irqrestore(&(ch->ch_nd)->nd_lock, lock_flags);
+
+ return 0;
+}
+
+
+
+/*
+ * Get current modem status
+ */
+static int get_modem_info(struct ch_struct *ch, unsigned int *value)
+{
+ unsigned int mlast;
+
+ mlast = ((ch->ch_s_mlast & ~(DM_RTS | DM_DTR)) |
+ (ch->ch_mout & (DM_RTS | DM_DTR)));
+
+ /* defined in /usr/include/asm/termios.h */
+ mlast = ((mlast & DM_RTS) ? TIOCM_RTS : 0)
+ | ((mlast & DM_DTR) ? TIOCM_DTR : 0)
+ | ((mlast & DM_CD) ? TIOCM_CAR : 0)
+ | ((mlast & DM_RI) ? TIOCM_RNG : 0)
+ | ((mlast & DM_DSR) ? TIOCM_DSR : 0)
+ | ((mlast & DM_CTS) ? TIOCM_CTS : 0);
+ put_user(mlast, (unsigned int __user *) value);
+
+ return 0;
+}
+
+/*
+ * Set modem lines
+ */
+static int set_modem_info(struct ch_struct *ch, unsigned int command,
+ unsigned int *value)
+{
+ int error;
+ unsigned int arg;
+ int mval = 0;
+ ulong lock_flags;
+
+ error = access_ok(VERIFY_READ, (void __user *) value, sizeof(int));
+ if (error == 0)
+ return -EFAULT;
+
+ get_user(arg, (unsigned int __user *) value);
+ mval |= ((arg & TIOCM_RTS) ? DM_RTS : 0)
+ | ((arg & TIOCM_DTR) ? DM_DTR : 0);
+
+ switch (command) {
+ case TIOCMBIS: /* set flags */
+ ch->ch_mout |= mval;
+ break;
+ case TIOCMBIC: /* clear flags */
+ ch->ch_mout &= ~mval;
+ break;
+ case TIOCMSET:
+ ch->ch_mout = mval;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&(ch->ch_nd)->nd_lock, lock_flags);
+
+ ch->ch_flag |= CH_PARAM;
+ (ch->ch_nd)->nd_tx_work = 1;
+ wake_up_interruptible(&ch->ch_flag_wait);
+
+ spin_unlock_irqrestore(&(ch->ch_nd)->nd_lock, lock_flags);
+
+ return 0;
+}
+
+
+/*
+ * Assign the custom baud rate to the channel structure
+ */
+static void dgrp_set_custom_speed(struct ch_struct *ch, int newrate)
+{
+ int testdiv;
+ int testrate_high;
+ int testrate_low;
+
+ int deltahigh, deltalow;
+
+ if (newrate < 0)
+ newrate = 0;
+
+ /*
+ * Since the divisor is stored in a 16-bit integer, we make sure
+ * we don't allow any rates smaller than a 16-bit integer would allow.
+ * And of course, rates above the dividend won't fly.
+ */
+ if (newrate && newrate < ((PORTSERVER_DIVIDEND / 0xFFFF) + 1))
+ newrate = ((PORTSERVER_DIVIDEND / 0xFFFF) + 1);
+ if (newrate && newrate > PORTSERVER_DIVIDEND)
+ newrate = PORTSERVER_DIVIDEND;
+
+ while (newrate > 0) {
+ testdiv = PORTSERVER_DIVIDEND / newrate;
+
+ /*
+ * If we try to figure out what rate the PortServer would use
+ * with the test divisor, it will be either equal or higher
+ * than the requested baud rate. If we then determine the
+ * rate with a divisor one higher, we will get the next lower
+ * supported rate below the requested.
+ */
+ testrate_high = PORTSERVER_DIVIDEND / testdiv;
+ testrate_low = PORTSERVER_DIVIDEND / (testdiv + 1);
+
+ /*
+ * If the rate for the requested divisor is correct, just
+ * use it and be done.
+ */
+ if (testrate_high == newrate)
+ break;
+
+ /*
+ * Otherwise, pick the rate that is closer (i.e. whichever rate
+ * has a smaller delta).
+ */
+ deltahigh = testrate_high - newrate;
+ deltalow = newrate - testrate_low;
+
+ if (deltahigh < deltalow)
+ newrate = testrate_high;
+ else
+ newrate = testrate_low;
+
+ break;
+ }
+
+ ch->ch_custom_speed = newrate;
+
+ drp_param(ch);
+
+ return;
+}
+
+
+/*
+ # dgrp_tty_digiseta()
+ *
+ * Ioctl to set the information from ditty.
+ *
+ * NOTE: DIGI_IXON, DSRPACE, DCDPACE, and DTRPACE are unsupported. JAR 990922
+ */
+static int dgrp_tty_digiseta(struct tty_struct *tty,
+ struct digi_struct *new_info)
+{
+ struct un_struct *un = tty->driver_data;
+ struct ch_struct *ch;
+
+ if (!un)
+ return -ENODEV;
+
+ ch = un->un_ch;
+ if (!ch)
+ return -ENODEV;
+
+ if (copy_from_user(&ch->ch_digi, (void __user *) new_info,
+ sizeof(struct digi_struct)))
+ return -EFAULT;
+
+ if ((ch->ch_digi.digi_flags & RTSPACE) ||
+ (ch->ch_digi.digi_flags & CTSPACE))
+ tty->termios.c_cflag |= CRTSCTS;
+ else
+ tty->termios.c_cflag &= ~CRTSCTS;
+
+ if (ch->ch_digi.digi_maxcps < 1)
+ ch->ch_digi.digi_maxcps = 1;
+
+ if (ch->ch_digi.digi_maxcps > 10000)
+ ch->ch_digi.digi_maxcps = 10000;
+
+ if (ch->ch_digi.digi_bufsize < 10)
+ ch->ch_digi.digi_bufsize = 10;
+
+ if (ch->ch_digi.digi_maxchar < 1)
+ ch->ch_digi.digi_maxchar = 1;
+
+ if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize)
+ ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize;
+
+ if (ch->ch_digi.digi_onlen > DIGI_PLEN)
+ ch->ch_digi.digi_onlen = DIGI_PLEN;
+
+ if (ch->ch_digi.digi_offlen > DIGI_PLEN)
+ ch->ch_digi.digi_offlen = DIGI_PLEN;
+
+ /* make the changes now */
+ drp_param(ch);
+
+ return 0;
+}
+
+
+
+/*
+ * dgrp_tty_digigetedelay()
+ *
+ * Ioctl to get the current edelay setting.
+ *
+ *
+ *
+ */
+static int dgrp_tty_digigetedelay(struct tty_struct *tty, int *retinfo)
+{
+ struct un_struct *un;
+ struct ch_struct *ch;
+ int tmp;
+
+ if (!retinfo)
+ return -EFAULT;
+
+ if (!tty || tty->magic != TTY_MAGIC)
+ return -EFAULT;
+
+ un = tty->driver_data;
+
+ if (!un)
+ return -ENODEV;
+
+ ch = un->un_ch;
+ if (!ch)
+ return -ENODEV;
+
+ tmp = ch->ch_edelay;
+
+ if (copy_to_user((void __user *) retinfo, &tmp, sizeof(*retinfo)))
+ return -EFAULT;
+
+ return 0;
+}
+
+
+/*
+ * dgrp_tty_digisetedelay()
+ *
+ * Ioctl to set the EDELAY setting
+ *
+ */
+static int dgrp_tty_digisetedelay(struct tty_struct *tty, int *new_info)
+{
+ struct un_struct *un;
+ struct ch_struct *ch;
+ int new_digi;
+
+ if (!tty || tty->magic != TTY_MAGIC)
+ return -EFAULT;
+
+ un = tty->driver_data;
+
+ if (!un)
+ return -ENODEV;
+
+ ch = un->un_ch;
+ if (!ch)
+ return -ENODEV;
+
+ if (copy_from_user(&new_digi, (void __user *)new_info, sizeof(int)))
+ return -EFAULT;
+
+ ch->ch_edelay = new_digi;
+
+ /* make the changes now */
+ drp_param(ch);
+
+ return 0;
+}
+
+
+/*
+ * The usual assortment of ioctl's
+ *
+ * note: use tty_check_change to make sure that we are not
+ * changing the state of a terminal when we are not a process
+ * in the forground. See tty_io.c
+ * rc = tty_check_change(tty);
+ * if (rc) return rc;
+ */
+static int dgrp_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
+ unsigned long arg)
+{
+ struct un_struct *un;
+ struct ch_struct *ch;
+ int rc;
+ struct digiflow_struct dflow;
+
+ if (!tty)
+ return -ENODEV;
+
+ un = tty->driver_data;
+ if (!un)
+ return -ENODEV;
+
+ ch = un->un_ch;
+ if (!ch)
+ return -ENODEV;
+
+ switch (cmd) {
+
+ /*
+ * Here are all the standard ioctl's that we MUST implement
+ */
+
+ case TCSBRK:
+ /*
+ * TCSBRK is SVID version: non-zero arg --> no break
+ * this behaviour is exploited by tcdrain().
+ *
+ * According to POSIX.1 spec (7.2.2.1.2) breaks should be
+ * between 0.25 and 0.5 seconds
+ */
+
+ rc = tty_check_change(tty);
+ if (rc)
+ return rc;
+ tty_wait_until_sent(tty, 0);
+
+ if (!arg)
+ rc = dgrp_send_break(ch, 250); /* 1/4 second */
+
+ if (dgrp_tty_chars_in_buffer(tty) != 0)
+ return -EINTR;
+
+ return 0;
+
+ case TCSBRKP:
+ /* support for POSIX tcsendbreak()
+ *
+ * According to POSIX.1 spec (7.2.2.1.2) breaks should be
+ * between 0.25 and 0.5 seconds so we'll ask for something
+ * in the middle: 0.375 seconds.
+ */
+ rc = tty_check_change(tty);
+ if (rc)
+ return rc;
+ tty_wait_until_sent(tty, 0);
+
+ rc = dgrp_send_break(ch, arg ? arg*250 : 250);
+
+ if (dgrp_tty_chars_in_buffer(tty) != 0)
+ return -EINTR;
+ return 0;
+
+ case TIOCSBRK:
+ rc = tty_check_change(tty);
+ if (rc)
+ return rc;
+ tty_wait_until_sent(tty, 0);
+
+ /*
+ * RealPort doesn't support turning on a break unconditionally.
+ * The RealPort device will stop sending a break automatically
+ * after the specified time value that we send in.
+ */
+ rc = dgrp_send_break(ch, 250); /* 1/4 second */
+
+ if (dgrp_tty_chars_in_buffer(tty) != 0)
+ return -EINTR;
+ return 0;
+
+ case TIOCCBRK:
+ /*
+ * RealPort doesn't support turning off a break unconditionally.
+ * The RealPort device will stop sending a break automatically
+ * after the specified time value that was sent when turning on
+ * the break.
+ */
+ return 0;
+
+ case TIOCGSOFTCAR:
+ rc = access_ok(VERIFY_WRITE, (void __user *) arg,
+ sizeof(long));
+ if (rc == 0)
+ return -EFAULT;
+ put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *) arg);
+ return 0;
+
+ case TIOCSSOFTCAR:
+ get_user(arg, (unsigned long __user *) arg);
+ tty->termios.c_cflag =
+ ((tty->termios.c_cflag & ~CLOCAL) |
+ (arg ? CLOCAL : 0));
+ return 0;
+
+ case TIOCMGET:
+ rc = access_ok(VERIFY_WRITE, (void __user *) arg,
+ sizeof(unsigned int));
+ if (rc == 0)
+ return -EFAULT;
+ return get_modem_info(ch, (unsigned int *) arg);
+
+ case TIOCMBIS:
+ case TIOCMBIC:
+ case TIOCMSET:
+ return set_modem_info(ch, cmd, (unsigned int *) arg);
+
+ /*
+ * Here are any additional ioctl's that we want to implement
+ */
+
+ case TCFLSH:
+ /*
+ * The linux tty driver doesn't have a flush
+ * input routine for the driver, assuming all backed
+ * up data is in the line disc. buffers. However,
+ * we all know that's not the case. Here, we
+ * act on the ioctl, but then lie and say we didn't
+ * so the line discipline will process the flush
+ * also.
+ */
+ rc = tty_check_change(tty);
+ if (rc)
+ return rc;
+
+ switch (arg) {
+ case TCIFLUSH:
+ case TCIOFLUSH:
+ /* only flush input if this is the only open unit */
+ if (!IS_PRINT(MINOR(tty_devnum(tty)))) {
+ ch->ch_rout = ch->ch_rin;
+ ch->ch_send |= RR_RX_FLUSH;
+ (ch->ch_nd)->nd_tx_work = 1;
+ (ch->ch_nd)->nd_tx_ready = 1;
+ wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
+ }
+ if (arg == TCIFLUSH)
+ break;
+
+ case TCOFLUSH: /* flush output, or the receive buffer */
+ /*
+ * This is handled in the tty_ioctl.c code
+ * calling tty_flush_buffer
+ */
+ break;
+
+ default:
+ /* POSIX.1 says return EINVAL if we got a bad arg */
+ return -EINVAL;
+ }
+ /* pretend we didn't recognize this IOCTL */
+ return -ENOIOCTLCMD;
+
+#ifdef TIOCGETP
+ case TIOCGETP:
+#endif
+ /*****************************************
+ Linux HPUX Function
+ TCSETA TCSETA - set the termios
+ TCSETAF TCSETAF - wait for drain first, then set termios
+ TCSETAW TCSETAW - wait for drain, flush the input queue, then set termios
+ - looking at the tty_ioctl code, these command all call our
+ tty_set_termios at the driver's end, when a TCSETA* is sent,
+ it is expecting the tty to have a termio structure,
+ NOT a termios stucture. These two structures differ in size
+ and the tty_ioctl code does a conversion before processing them both.
+ - we should treat the TCSETAW TCSETAF ioctls the same, and let
+ the tty_ioctl code do the conversion stuff.
+
+ TCSETS
+ TCSETSF (none)
+ TCSETSW
+ - the associated tty structure has a termios structure.
+ *****************************************/
+
+ case TCGETS:
+ case TCGETA:
+ return -ENOIOCTLCMD;
+
+ case TCSETAW:
+ case TCSETAF:
+ case TCSETSF:
+ case TCSETSW:
+ /*
+ * The linux tty driver doesn't have a flush
+ * input routine for the driver, assuming all backed
+ * up data is in the line disc. buffers. However,
+ * we all know that's not the case. Here, we
+ * act on the ioctl, but then lie and say we didn't
+ * so the line discipline will process the flush
+ * also.
+ */
+
+ /*
+ * Also, now that we have TXPrint, we have to check
+ * if this is the TXPrint device and the terminal
+ * device is open. If so, do NOT run check_change,
+ * as the terminal device is ALWAYS the parent.
+ */
+ if (!IS_PRINT(MINOR(tty_devnum(tty))) ||
+ !ch->ch_tun.un_open_count) {
+ rc = tty_check_change(tty);
+ if (rc)
+ return rc;
+ }
+
+ /* wait for all the characters in tbuf to drain */
+ tty_wait_until_sent(tty, 0);
+
+ if ((cmd == TCSETSF) || (cmd == TCSETAF)) {
+ /* flush the contents of the rbuf queue */
+ /* TODO: check if this is print device? */
+ ch->ch_send |= RR_RX_FLUSH;
+ (ch->ch_nd)->nd_tx_ready = 1;
+ (ch->ch_nd)->nd_tx_work = 1;
+ wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
+ /* do we need to do this? just to be safe! */
+ ch->ch_rout = ch->ch_rin;
+ }
+
+ /* pretend we didn't recognize this */
+ return -ENOIOCTLCMD;
+
+ case TCXONC:
+ /*
+ * The Linux Line Discipline (LD) would do this for us if we
+ * let it, but we have the special firmware options to do this
+ * the "right way" regardless of hardware or software flow
+ * control so we'll do it outselves instead of letting the LD
+ * do it.
+ */
+ rc = tty_check_change(tty);
+ if (rc)
+ return rc;
+
+ switch (arg) {
+ case TCOON:
+ dgrp_tty_start(tty);
+ return 0;
+ case TCOOFF:
+ dgrp_tty_stop(tty);
+ return 0;
+ case TCION:
+ dgrp_tty_input_start(tty);
+ return 0;
+ case TCIOFF:
+ dgrp_tty_input_stop(tty);
+ return 0;
+ default:
+ return -EINVAL;
+ }
+
+ case DIGI_GETA:
+ /* get information for ditty */
+ if (copy_to_user((struct digi_struct __user *) arg,
+ &ch->ch_digi, sizeof(struct digi_struct)))
+ return -EFAULT;
+ break;
+
+ case DIGI_SETAW:
+ case DIGI_SETAF:
+ /* wait for all the characters in tbuf to drain */
+ tty_wait_until_sent(tty, 0);
+
+ if (cmd == DIGI_SETAF) {
+ /* flush the contents of the rbuf queue */
+ /* send down a packet with RR_RX_FLUSH set */
+ ch->ch_send |= RR_RX_FLUSH;
+ (ch->ch_nd)->nd_tx_ready = 1;
+ (ch->ch_nd)->nd_tx_work = 1;
+ wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
+ /* do we need to do this? just to be safe! */
+ ch->ch_rout = ch->ch_rin;
+ }
+
+ /* pretend we didn't recognize this */
+
+ case DIGI_SETA:
+ return dgrp_tty_digiseta(tty, (struct digi_struct *) arg);
+
+ case DIGI_SEDELAY:
+ return dgrp_tty_digisetedelay(tty, (int *) arg);
+
+ case DIGI_GEDELAY:
+ return dgrp_tty_digigetedelay(tty, (int *) arg);
+
+ case DIGI_GETFLOW:
+ case DIGI_GETAFLOW:
+ if (cmd == (DIGI_GETFLOW)) {
+ dflow.startc = tty->termios.c_cc[VSTART];
+ dflow.stopc = tty->termios.c_cc[VSTOP];
+ } else {
+ dflow.startc = ch->ch_xxon;
+ dflow.stopc = ch->ch_xxoff;
+ }
+
+ if (copy_to_user((char __user *)arg, &dflow, sizeof(dflow)))
+ return -EFAULT;
+ break;
+
+ case DIGI_SETFLOW:
+ case DIGI_SETAFLOW:
+
+ if (copy_from_user(&dflow, (char __user *)arg, sizeof(dflow)))
+ return -EFAULT;
+
+ if (cmd == (DIGI_SETFLOW)) {
+ tty->termios.c_cc[VSTART] = dflow.startc;
+ tty->termios.c_cc[VSTOP] = dflow.stopc;
+ } else {
+ ch->ch_xxon = dflow.startc;
+ ch->ch_xxoff = dflow.stopc;
+ }
+ break;
+
+ case DIGI_GETCUSTOMBAUD:
+ rc = access_ok(VERIFY_WRITE, (void __user *) arg, sizeof(int));
+ if (rc == 0)
+ return -EFAULT;
+ put_user(ch->ch_custom_speed, (unsigned int __user *) arg);
+ break;
+
+ case DIGI_SETCUSTOMBAUD:
+ {
+ int new_rate;
+
+ get_user(new_rate, (unsigned int __user *) arg);
+ dgrp_set_custom_speed(ch, new_rate);
+
+ break;
+ }
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+
+ return 0;
+}
+
+/*
+ * This routine allows the tty driver to be notified when
+ * the device's termios setting have changed. Note that we
+ * should be prepared to accept the case where old == NULL
+ * and try to do something rational.
+ *
+ * So we need to make sure that our copies of ch_oflag,
+ * ch_clag, and ch_iflag reflect the tty->termios flags.
+ */
+static void dgrp_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
+{
+ struct ktermios *ts;
+ struct ch_struct *ch;
+ struct un_struct *un;
+
+ /* seems silly, but we have to check all these! */
+ if (!tty)
+ return;
+
+ un = tty->driver_data;
+ if (!un)
+ return;
+
+ ts = &tty->termios;
+
+ ch = un->un_ch;
+ if (!ch)
+ return;
+
+ drp_param(ch);
+
+ /* the CLOCAL flag has just been set */
+ if (!(old->c_cflag & CLOCAL) && C_CLOCAL(tty))
+ wake_up_interruptible(&un->un_open_wait);
+}
+
+
+/*
+ * Throttle receiving data. We just set a bit and stop reading
+ * data out of the channel buffer. It will back up and the
+ * FEP will do whatever is necessary to stop the far end.
+ */
+static void dgrp_tty_throttle(struct tty_struct *tty)
+{
+ struct ch_struct *ch;
+
+ if (!tty)
+ return;
+
+ ch = ((struct un_struct *) tty->driver_data)->un_ch;
+ if (!ch)
+ return;
+
+ ch->ch_flag |= CH_RXSTOP;
+}
+
+
+static void dgrp_tty_unthrottle(struct tty_struct *tty)
+{
+ struct ch_struct *ch;
+
+ if (!tty)
+ return;
+
+ ch = ((struct un_struct *) tty->driver_data)->un_ch;
+ if (!ch)
+ return;
+
+ ch->ch_flag &= ~CH_RXSTOP;
+}
+
+/*
+ * Stop the transmitter
+ */
+static void dgrp_tty_stop(struct tty_struct *tty)
+{
+ struct ch_struct *ch;
+
+ if (!tty)
+ return;
+
+ ch = ((struct un_struct *) tty->driver_data)->un_ch;
+ if (!ch)
+ return;
+
+ ch->ch_send |= RR_TX_STOP;
+ ch->ch_send &= ~RR_TX_START;
+
+ /* make the change NOW! */
+ (ch->ch_nd)->nd_tx_ready = 1;
+ if (waitqueue_active(&(ch->ch_nd)->nd_tx_waitq))
+ wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
+}
+
+/*
+ * Start the transmitter
+ */
+static void dgrp_tty_start(struct tty_struct *tty)
+{
+ struct ch_struct *ch;
+
+ if (!tty)
+ return;
+
+ ch = ((struct un_struct *) tty->driver_data)->un_ch;
+ if (!ch)
+ return;
+
+ /* TODO: don't do anything if the transmitter is not stopped */
+
+ ch->ch_send |= RR_TX_START;
+ ch->ch_send &= ~RR_TX_STOP;
+
+ /* make the change NOW! */
+ (ch->ch_nd)->nd_tx_ready = 1;
+ (ch->ch_nd)->nd_tx_work = 1;
+ if (waitqueue_active(&(ch->ch_nd)->nd_tx_waitq))
+ wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
+
+}
+
+/*
+ * Stop the reciever
+ */
+static void dgrp_tty_input_stop(struct tty_struct *tty)
+{
+ struct ch_struct *ch;
+
+ if (!tty)
+ return;
+
+ ch = ((struct un_struct *) tty->driver_data)->un_ch;
+ if (!ch)
+ return;
+
+ ch->ch_send |= RR_RX_STOP;
+ ch->ch_send &= ~RR_RX_START;
+ (ch->ch_nd)->nd_tx_ready = 1;
+ if (waitqueue_active(&(ch->ch_nd)->nd_tx_waitq))
+ wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
+
+}
+
+
+static void dgrp_tty_send_xchar(struct tty_struct *tty, char c)
+{
+ struct un_struct *un;
+ struct ch_struct *ch;
+
+ if (!tty)
+ return;
+
+ un = tty->driver_data;
+ if (!un)
+ return;
+
+ ch = un->un_ch;
+ if (!ch)
+ return;
+ if (c == STOP_CHAR(tty))
+ ch->ch_send |= RR_RX_STOP;
+ else if (c == START_CHAR(tty))
+ ch->ch_send |= RR_RX_START;
+
+ ch->ch_nd->nd_tx_ready = 1;
+ ch->ch_nd->nd_tx_work = 1;
+
+ return;
+}
+
+
+static void dgrp_tty_input_start(struct tty_struct *tty)
+{
+ struct ch_struct *ch;
+
+ if (!tty)
+ return;
+
+ ch = ((struct un_struct *) tty->driver_data)->un_ch;
+ if (!ch)
+ return;
+
+ ch->ch_send |= RR_RX_START;
+ ch->ch_send &= ~RR_RX_STOP;
+ (ch->ch_nd)->nd_tx_ready = 1;
+ (ch->ch_nd)->nd_tx_work = 1;
+ if (waitqueue_active(&(ch->ch_nd)->nd_tx_waitq))
+ wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
+
+}
+
+
+/*
+ * Hangup the port. Like a close, but don't wait for output
+ * to drain.
+ *
+ * How do we close all the channels that are open?
+ */
+static void dgrp_tty_hangup(struct tty_struct *tty)
+{
+ struct ch_struct *ch;
+ struct nd_struct *nd;
+ struct un_struct *un;
+
+ if (!tty)
+ return;
+
+ un = tty->driver_data;
+ if (!un)
+ return;
+
+ ch = un->un_ch;
+ if (!ch)
+ return;
+
+ nd = ch->ch_nd;
+
+ if (C_HUPCL(tty)) {
+ /* LOWER DTR */
+ ch->ch_mout &= ~DM_DTR;
+ /* Don't do this here */
+ /* ch->ch_flag |= CH_HANGUP; */
+ ch->ch_nd->nd_tx_ready = 1;
+ ch->ch_nd->nd_tx_work = 1;
+ if (waitqueue_active(&ch->ch_flag_wait))
+ wake_up_interruptible(&ch->ch_flag_wait);
+ }
+
+}
+
+/************************************************************************/
+/* */
+/* TTY Initialization/Cleanup Functions */
+/* */
+/************************************************************************/
+
+/*
+ * Uninitialize the TTY portion of the supplied node. Free all
+ * memory and resources associated with this node. Do it in reverse
+ * allocation order: this might possibly result in less fragmentation
+ * of memory, though I don't know this for sure.
+ */
+void
+dgrp_tty_uninit(struct nd_struct *nd)
+{
+ char id[3];
+
+ ID_TO_CHAR(nd->nd_ID, id);
+
+ if (nd->nd_ttdriver_flags & SERIAL_TTDRV_REG) {
+ tty_unregister_driver(nd->nd_serial_ttdriver);
+
+ kfree(nd->nd_serial_ttdriver->ttys);
+ nd->nd_serial_ttdriver->ttys = NULL;
+
+ put_tty_driver(nd->nd_serial_ttdriver);
+ nd->nd_ttdriver_flags &= ~SERIAL_TTDRV_REG;
+ }
+
+ if (nd->nd_ttdriver_flags & CALLOUT_TTDRV_REG) {
+ tty_unregister_driver(nd->nd_callout_ttdriver);
+
+ kfree(nd->nd_callout_ttdriver->ttys);
+ nd->nd_callout_ttdriver->ttys = NULL;
+
+ put_tty_driver(nd->nd_callout_ttdriver);
+ nd->nd_ttdriver_flags &= ~CALLOUT_TTDRV_REG;
+ }
+
+ if (nd->nd_ttdriver_flags & XPRINT_TTDRV_REG) {
+ tty_unregister_driver(nd->nd_xprint_ttdriver);
+
+ kfree(nd->nd_xprint_ttdriver->ttys);
+ nd->nd_xprint_ttdriver->ttys = NULL;
+
+ put_tty_driver(nd->nd_xprint_ttdriver);
+ nd->nd_ttdriver_flags &= ~XPRINT_TTDRV_REG;
+ }
+}
+
+
+
+/*
+ * Initialize the TTY portion of the supplied node.
+ */
+int
+dgrp_tty_init(struct nd_struct *nd)
+{
+ char id[3];
+ int rc;
+ int i;
+
+ ID_TO_CHAR(nd->nd_ID, id);
+
+ /*
+ * Initialize the TTDRIVER structures.
+ */
+
+ nd->nd_serial_ttdriver = alloc_tty_driver(CHAN_MAX);
+ sprintf(nd->nd_serial_name, "tty_dgrp_%s_", id);
+
+ nd->nd_serial_ttdriver->owner = THIS_MODULE;
+ nd->nd_serial_ttdriver->name = nd->nd_serial_name;
+ nd->nd_serial_ttdriver->name_base = 0;
+ nd->nd_serial_ttdriver->major = 0;
+ nd->nd_serial_ttdriver->minor_start = 0;
+ nd->nd_serial_ttdriver->type = TTY_DRIVER_TYPE_SERIAL;
+ nd->nd_serial_ttdriver->subtype = SERIAL_TYPE_NORMAL;
+ nd->nd_serial_ttdriver->init_termios = DefaultTermios;
+ nd->nd_serial_ttdriver->driver_name = "dgrp";
+ nd->nd_serial_ttdriver->flags = (TTY_DRIVER_REAL_RAW |
+ TTY_DRIVER_DYNAMIC_DEV |
+ TTY_DRIVER_HARDWARE_BREAK);
+
+ /* The kernel wants space to store pointers to tty_structs. */
+ nd->nd_serial_ttdriver->ttys =
+ kzalloc(CHAN_MAX * sizeof(struct tty_struct *), GFP_KERNEL);
+ if (!nd->nd_serial_ttdriver->ttys)
+ return -ENOMEM;
+
+ tty_set_operations(nd->nd_serial_ttdriver, &dgrp_tty_ops);
+
+ if (!(nd->nd_ttdriver_flags & SERIAL_TTDRV_REG)) {
+ /*
+ * Register tty devices
+ */
+ rc = tty_register_driver(nd->nd_serial_ttdriver);
+ if (rc < 0) {
+ /*
+ * If errno is EBUSY, this means there are no more
+ * slots available to have us auto-majored.
+ * (Which is currently supported up to 256)
+ *
+ * We can still request majors above 256,
+ * we just have to do it manually.
+ */
+ if (rc == -EBUSY) {
+ int i;
+ int max_majors = 1U << (32 - MINORBITS);
+ for (i = 256; i < max_majors; i++) {
+ nd->nd_serial_ttdriver->major = i;
+ rc = tty_register_driver(nd->nd_serial_ttdriver);
+ if (rc >= 0)
+ break;
+ }
+ /* Really fail now, since we ran out
+ * of majors to try. */
+ if (i == max_majors)
+ return rc;
+
+ } else {
+ return rc;
+ }
+ }
+ nd->nd_ttdriver_flags |= SERIAL_TTDRV_REG;
+ }
+
+ nd->nd_callout_ttdriver = alloc_tty_driver(CHAN_MAX);
+ sprintf(nd->nd_callout_name, "cu_dgrp_%s_", id);
+
+ nd->nd_callout_ttdriver->owner = THIS_MODULE;
+ nd->nd_callout_ttdriver->name = nd->nd_callout_name;
+ nd->nd_callout_ttdriver->name_base = 0;
+ nd->nd_callout_ttdriver->major = nd->nd_serial_ttdriver->major;
+ nd->nd_callout_ttdriver->minor_start = 0x40;
+ nd->nd_callout_ttdriver->type = TTY_DRIVER_TYPE_SERIAL;
+ nd->nd_callout_ttdriver->subtype = SERIAL_TYPE_CALLOUT;
+ nd->nd_callout_ttdriver->init_termios = DefaultTermios;
+ nd->nd_callout_ttdriver->driver_name = "dgrp";
+ nd->nd_callout_ttdriver->flags = (TTY_DRIVER_REAL_RAW |
+ TTY_DRIVER_DYNAMIC_DEV |
+ TTY_DRIVER_HARDWARE_BREAK);
+
+ /* The kernel wants space to store pointers to tty_structs. */
+ nd->nd_callout_ttdriver->ttys =
+ kzalloc(CHAN_MAX * sizeof(struct tty_struct *), GFP_KERNEL);
+ if (!nd->nd_callout_ttdriver->ttys)
+ return -ENOMEM;
+
+ tty_set_operations(nd->nd_callout_ttdriver, &dgrp_tty_ops);
+
+ if (dgrp_register_cudevices) {
+ if (!(nd->nd_ttdriver_flags & CALLOUT_TTDRV_REG)) {
+ /*
+ * Register cu devices
+ */
+ rc = tty_register_driver(nd->nd_callout_ttdriver);
+ if (rc < 0)
+ return rc;
+ nd->nd_ttdriver_flags |= CALLOUT_TTDRV_REG;
+ }
+ }
+
+
+ nd->nd_xprint_ttdriver = alloc_tty_driver(CHAN_MAX);
+ sprintf(nd->nd_xprint_name, "pr_dgrp_%s_", id);
+
+ nd->nd_xprint_ttdriver->owner = THIS_MODULE;
+ nd->nd_xprint_ttdriver->name = nd->nd_xprint_name;
+ nd->nd_xprint_ttdriver->name_base = 0;
+ nd->nd_xprint_ttdriver->major = nd->nd_serial_ttdriver->major;
+ nd->nd_xprint_ttdriver->minor_start = 0x80;
+ nd->nd_xprint_ttdriver->type = TTY_DRIVER_TYPE_SERIAL;
+ nd->nd_xprint_ttdriver->subtype = SERIAL_TYPE_XPRINT;
+ nd->nd_xprint_ttdriver->init_termios = DefaultTermios;
+ nd->nd_xprint_ttdriver->driver_name = "dgrp";
+ nd->nd_xprint_ttdriver->flags = (TTY_DRIVER_REAL_RAW |
+ TTY_DRIVER_DYNAMIC_DEV |
+ TTY_DRIVER_HARDWARE_BREAK);
+
+ /* The kernel wants space to store pointers to tty_structs. */
+ nd->nd_xprint_ttdriver->ttys =
+ kzalloc(CHAN_MAX * sizeof(struct tty_struct *), GFP_KERNEL);
+ if (!nd->nd_xprint_ttdriver->ttys)
+ return -ENOMEM;
+
+ tty_set_operations(nd->nd_xprint_ttdriver, &dgrp_tty_ops);
+
+ if (dgrp_register_prdevices) {
+ if (!(nd->nd_ttdriver_flags & XPRINT_TTDRV_REG)) {
+ /*
+ * Register transparent print devices
+ */
+ rc = tty_register_driver(nd->nd_xprint_ttdriver);
+ if (rc < 0)
+ return rc;
+ nd->nd_ttdriver_flags |= XPRINT_TTDRV_REG;
+ }
+ }
+
+ for (i = 0; i < CHAN_MAX; i++) {
+ struct ch_struct *ch = nd->nd_chan + i;
+
+ ch->ch_nd = nd;
+ ch->ch_digi = digi_init;
+ ch->ch_edelay = 100;
+ ch->ch_custom_speed = 0;
+ ch->ch_portnum = i;
+ ch->ch_tun.un_ch = ch;
+ ch->ch_pun.un_ch = ch;
+ ch->ch_tun.un_type = SERIAL_TYPE_NORMAL;
+ ch->ch_pun.un_type = SERIAL_TYPE_XPRINT;
+
+ init_waitqueue_head(&(ch->ch_flag_wait));
+ init_waitqueue_head(&(ch->ch_sleep));
+
+ init_waitqueue_head(&(ch->ch_tun.un_open_wait));
+ init_waitqueue_head(&(ch->ch_tun.un_close_wait));
+
+ init_waitqueue_head(&(ch->ch_pun.un_open_wait));
+ init_waitqueue_head(&(ch->ch_pun.un_close_wait));
+ tty_port_init(&ch->port);
+ tty_port_init(&ch->port);
+ }
+ return 0;
+}
--- /dev/null
+/************************************************************************
+ * HP-UX Realport Daemon interface file.
+ *
+ * Copyright (C) 1998, by Digi International. All Rights Reserved.
+ ************************************************************************/
+
+#ifndef _DIGIDRP_H
+#define _DIGIDRP_H
+
+/************************************************************************
+ * This file contains defines for the ioctl() interface to
+ * the realport driver. This ioctl() interface is used by the
+ * daemon to set speed setup parameters honored by the driver.
+ ************************************************************************/
+
+struct link_struct {
+ int lk_fast_rate; /* Fast line rate to be used
+ when the delay is less-equal
+ to lk_fast_delay */
+
+ int lk_fast_delay; /* Fast line rate delay in
+ milliseconds */
+
+ int lk_slow_rate; /* Slow line rate to be used when
+ the delay is greater-equal
+ to lk_slow_delay */
+
+ int lk_slow_delay; /* Slow line rate delay in
+ milliseconds */
+
+ int lk_header_size; /* Estimated packet header size
+ when sent across the slowest
+ link. */
+};
+
+#define DIGI_GETLINK _IOW('e', 103, struct link_struct) /* Get link parameters */
+#define DIGI_SETLINK _IOW('e', 104, struct link_struct) /* Set link parameters */
+
+
+/************************************************************************
+ * This module provides application access to special Digi
+ * serial line enhancements which are not standard UNIX(tm) features.
+ ************************************************************************/
+
+struct digiflow_struct {
+ unsigned char startc; /* flow cntl start char */
+ unsigned char stopc; /* flow cntl stop char */
+};
+
+/************************************************************************
+ * Values for digi_flags
+ ************************************************************************/
+#define DIGI_IXON 0x0001 /* Handle IXON in the FEP */
+#define DIGI_FAST 0x0002 /* Fast baud rates */
+#define RTSPACE 0x0004 /* RTS input flow control */
+#define CTSPACE 0x0008 /* CTS output flow control */
+#define DSRPACE 0x0010 /* DSR output flow control */
+#define DCDPACE 0x0020 /* DCD output flow control */
+#define DTRPACE 0x0040 /* DTR input flow control */
+#define DIGI_COOK 0x0080 /* Cooked processing done in FEP */
+#define DIGI_FORCEDCD 0x0100 /* Force carrier */
+#define DIGI_ALTPIN 0x0200 /* Alternate RJ-45 pin config */
+#define DIGI_AIXON 0x0400 /* Aux flow control in fep */
+#define DIGI_PRINTER 0x0800 /* Hold port open for flow cntrl */
+#define DIGI_PP_INPUT 0x1000 /* Change parallel port to input */
+#define DIGI_422 0x4000 /* Change parallel port to input */
+#define DIGI_RTS_TOGGLE 0x8000 /* Support RTS Toggle */
+
+
+/************************************************************************
+ * Values associated with transparent print
+ ************************************************************************/
+#define DIGI_PLEN 8 /* String length */
+#define DIGI_TSIZ 10 /* Terminal string len */
+
+
+/************************************************************************
+ * Structure used with ioctl commands for DIGI parameters.
+ ************************************************************************/
+struct digi_struct {
+ unsigned short digi_flags; /* Flags (see above) */
+ unsigned short digi_maxcps; /* Max printer CPS */
+ unsigned short digi_maxchar; /* Max chars in print queue */
+ unsigned short digi_bufsize; /* Buffer size */
+ unsigned char digi_onlen; /* Length of ON string */
+ unsigned char digi_offlen; /* Length of OFF string */
+ char digi_onstr[DIGI_PLEN]; /* Printer on string */
+ char digi_offstr[DIGI_PLEN]; /* Printer off string */
+ char digi_term[DIGI_TSIZ]; /* terminal string */
+};
+
+/************************************************************************
+ * Ioctl command arguments for DIGI parameters.
+ ************************************************************************/
+/* Read params */
+#define DIGI_GETA _IOR('e', 94, struct digi_struct)
+
+/* Set params */
+#define DIGI_SETA _IOW('e', 95, struct digi_struct)
+
+/* Drain & set params */
+#define DIGI_SETAW _IOW('e', 96, struct digi_struct)
+
+/* Drain, flush & set params */
+#define DIGI_SETAF _IOW('e', 97, struct digi_struct)
+
+/* Get startc/stopc flow control characters */
+#define DIGI_GETFLOW _IOR('e', 99, struct digiflow_struct)
+
+/* Set startc/stopc flow control characters */
+#define DIGI_SETFLOW _IOW('e', 100, struct digiflow_struct)
+
+/* Get Aux. startc/stopc flow control chars */
+#define DIGI_GETAFLOW _IOR('e', 101, struct digiflow_struct)
+
+/* Set Aux. startc/stopc flow control chars */
+#define DIGI_SETAFLOW _IOW('e', 102, struct digiflow_struct)
+
+/* Set integer baud rate */
+#define DIGI_SETCUSTOMBAUD _IOW('e', 106, int)
+
+/* Get integer baud rate */
+#define DIGI_GETCUSTOMBAUD _IOR('e', 107, int)
+
+#define DIGI_GEDELAY _IOR('d', 246, int) /* Get edelay */
+#define DIGI_SEDELAY _IOW('d', 247, int) /* Get edelay */
+
+
+#endif /* _DIGIDRP_H */
--- /dev/null
+/*
+ *
+ * Copyright 1999 Digi International (www.digi.com)
+ * Gene Olson <gene at digi dot com>
+ * James Puzzo <jamesp at digi dot com>
+ * Scott Kilau <scottk at digi dot com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU General Public License for more details.
+ *
+ */
+
+/************************************************************************
+ * Master include file for Linux Realport Driver.
+ ************************************************************************/
+
+#ifndef __DRP_H
+#define __DRP_H
+
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <linux/semaphore.h>
+#include <linux/tty.h>
+
+
+#include "digirp.h"
+
+/************************************************************************
+ * Tuning parameters.
+ ************************************************************************/
+
+#define CHAN_MAX 64 /* Max # ports per server */
+
+#define SEQ_MAX 128 /* Max # transmit sequences (2^n) */
+#define SEQ_MASK (SEQ_MAX-1) /* Sequence buffer modulus mask */
+
+#define TBUF_MAX 4096 /* Size of transmit buffer (2^n) */
+#define RBUF_MAX 4096 /* Size of receive buffer (2^n) */
+
+#define TBUF_MASK (TBUF_MAX-1) /* Transmit buffer modulus mask */
+#define RBUF_MASK (RBUF_MAX-1) /* Receive buffer modulus mask */
+
+#define TBUF_LOW 1000 /* Transmit low water mark */
+
+#define UIO_BASE 1000 /* Base for write operations */
+#define UIO_MIN 2000 /* Minimum size application buffer */
+#define UIO_MAX 8100 /* Unix I/O buffer size */
+
+#define MON_MAX 65536 /* Monitor buffer size (2^n) */
+#define MON_MASK (MON_MAX-1) /* Monitor wrap mask */
+
+#define DPA_MAX 65536 /* DPA buffer size (2^n) */
+#define DPA_MASK (DPA_MAX-1) /* DPA wrap mask */
+#define DPA_HIGH_WATER 58000 /* Enforce flow control when
+ * over this amount
+ */
+
+#define IDLE_MAX (20 * HZ) /* Max TCP link idle time */
+
+#define MAX_DESC_LEN 100 /* Maximum length of stored PS
+ * description
+ */
+
+#define WRITEBUFLEN ((4096) + 4) /* 4 extra for alignment play space */
+
+#define VPDSIZE 512
+
+/************************************************************************
+ * Minor device decoding conventions.
+ ************************************************************************
+ *
+ * For Linux, the net and mon devices are handled via "proc", so we
+ * only have to mux the "tty" devices. Since every PortServer will
+ * have an individual major number, the PortServer number does not
+ * need to be encoded, and in fact, does not need to exist.
+ *
+ */
+
+/*
+ * Port device decoding conventions:
+ *
+ * Device 00 - 3f 64 dial-in modem devices. (tty)
+ * Device 40 - 7f 64 dial-out tty devices. (cu)
+ * Device 80 - bf 64 dial-out printer devices.
+ *
+ * IS_PRINT(dev) This is a printer device.
+ *
+ * OPEN_CATEGORY(dev) Specifies the device category. No two
+ * devices of different categories may be open
+ * at the same time.
+ *
+ * The following require the category returned by OPEN_CATEGORY().
+ *
+ * OPEN_WAIT_AVAIL(cat) Waits on open until the device becomes
+ * available. Fails if NDELAY specified.
+ *
+ * OPEN_WAIT_CARRIER(cat) Waits on open if carrier is not present.
+ * Succeeds if NDELAY is given.
+ *
+ * OPEN_FORCES_CARRIER(cat) Carrier is forced high on open.
+ *
+ */
+
+#define PORT_NUM(dev) ((dev) & 0x3f)
+
+#define OPEN_CATEGORY(dev) ((((dev) & 0x80) & 0x40))
+#define IS_PRINT(dev) (((dev) & 0xff) >= 0x80)
+
+#define OPEN_WAIT_AVAIL(cat) (((cat) & 0x40) == 0x000)
+#define OPEN_WAIT_CARRIER(cat) (((cat) & 0x40) == 0x000)
+#define OPEN_FORCES_CARRIER(cat) (((cat) & 0x40) != 0x000)
+
+
+/************************************************************************
+ * Modem signal defines for 16450/16550 compatible FEP.
+ * set in ch_mout, ch_mflow, ch_mlast etc
+ ************************************************************************/
+
+/* TODO : Re-verify that these modem signal definitions are correct */
+
+#define DM_DTR 0x01
+#define DM_RTS 0x02
+#define DM_RTS_TOGGLE 0x04
+
+#define DM_OUT1 0x04
+#define DM_OUT2 0x08
+
+#define DM_CTS 0x10
+#define DM_DSR 0x20
+#define DM_RI 0x40
+#define DM_CD 0x80 /* This is the DCD flag */
+
+
+/************************************************************************
+ * Realport Event Flags.
+ ************************************************************************/
+
+#define EV_OPU 0x0001 /* Ouput paused by client */
+#define EV_OPS 0x0002 /* Output paused by XOFF */
+#define EV_OPX 0x0004 /* Output paused by XXOFF */
+#define EV_OPH 0x0008 /* Output paused by MFLOW */
+#define EV_IPU 0x0010 /* Input paused by client */
+#define EV_IPS 0x0020 /* Input paused by hi/low water */
+#define EV_TXB 0x0040 /* Transmit break pending */
+#define EV_TXI 0x0080 /* Transmit immediate pending */
+#define EV_TXF 0x0100 /* Transmit flow control pending */
+#define EV_RXB 0x0200 /* Break received */
+
+
+/************************************************************************
+ * Realport CFLAGS.
+ ************************************************************************/
+
+#define CF_CS5 0x0000 /* 5 bit characters */
+#define CF_CS6 0x0010 /* 6 bit characters */
+#define CF_CS7 0x0020 /* 7 bit characters */
+#define CF_CS8 0x0030 /* 8 bit characters */
+#define CF_CSIZE 0x0030 /* Character size */
+#define CF_CSTOPB 0x0040 /* Two stop bits */
+#define CF_CREAD 0x0080 /* Enable receiver */
+#define CF_PARENB 0x0100 /* Enable parity */
+#define CF_PARODD 0x0200 /* Odd parity */
+#define CF_HUPCL 0x0400 /* Drop DTR on close */
+
+
+/************************************************************************
+ * Realport XFLAGS.
+ ************************************************************************/
+
+#define XF_XPAR 0x0001 /* Enable Mark/Space Parity */
+#define XF_XMODEM 0x0002 /* Enable in-band modem signalling */
+#define XF_XCASE 0x0004 /* Convert special characters */
+#define XF_XEDATA 0x0008 /* Error data in stream */
+#define XF_XTOSS 0x0010 /* Toss IXANY characters */
+#define XF_XIXON 0x0020 /* xxon/xxoff enable */
+
+
+/************************************************************************
+ * Realport IFLAGS.
+ ************************************************************************/
+
+#define IF_IGNBRK 0x0001 /* Ignore input break */
+#define IF_BRKINT 0x0002 /* Break interrupt */
+#define IF_IGNPAR 0x0004 /* Ignore error characters */
+#define IF_PARMRK 0x0008 /* Error chars marked with 0xff */
+#define IF_INPCK 0x0010 /* Input parity checking enabled */
+#define IF_ISTRIP 0x0020 /* Input chars masked with 0x7F */
+#define IF_IXON 0x0400 /* Output software flow control */
+#define IF_IXANY 0x0800 /* Restart output on any char */
+#define IF_IXOFF 0x1000 /* Input software flow control */
+#define IF_DOSMODE 0x8000 /* 16450-compatible errors */
+
+
+/************************************************************************
+ * Realport OFLAGS.
+ ************************************************************************/
+
+#define OF_OLCUC 0x0002 /* Map lower to upper case */
+#define OF_ONLCR 0x0004 /* Map NL to CR-NL */
+#define OF_OCRNL 0x0008 /* Map CR to NL */
+#define OF_ONOCR 0x0010 /* No CR output at column 0 */
+#define OF_ONLRET 0x0020 /* Assume NL does NL/CR */
+#define OF_TAB3 0x1800 /* Tabs expand to 8 spaces */
+#define OF_TABDLY 0x1800 /* Tab delay */
+
+/************************************************************************
+ * Unit flag definitions for un_flag.
+ ************************************************************************/
+
+/* These are the DIGI unit flags */
+#define UN_EXCL 0x00010000 /* Exclusive open */
+#define UN_STICKY 0x00020000 /* TTY Settings are now sticky */
+#define UN_BUSY 0x00040000 /* Some work this channel */
+#define UN_PWAIT 0x00080000 /* Printer waiting for terminal */
+#define UN_TIME 0x00100000 /* Waiting on time */
+#define UN_EMPTY 0x00200000 /* Waiting output queue empty */
+#define UN_LOW 0x00400000 /* Waiting output low water */
+#define UN_DIGI_MASK 0x00FF0000 /* Waiting output low water */
+
+/*
+ * Definitions for async_struct (and serial_struct) flags field
+ *
+ * these are the ASYNC flags copied from serial.h
+ *
+ */
+#define UN_HUP_NOTIFY 0x0001 /* Notify getty on hangups and
+ * closes on the callout port
+ */
+#define UN_FOURPORT 0x0002 /* Set OU1, OUT2 per AST Fourport settings */
+#define UN_SAK 0x0004 /* Secure Attention Key (Orange book) */
+#define UN_SPLIT_TERMIOS 0x0008 /* Separate termios for dialin/callout */
+
+#define UN_SPD_MASK 0x0030
+#define UN_SPD_HI 0x0010 /* Use 56000 instead of 38400 bps */
+#define UN_SPD_VHI 0x0020 /* Use 115200 instead of 38400 bps */
+#define UN_SPD_CUST 0x0030 /* Use user-specified divisor */
+
+#define UN_SKIP_TEST 0x0040 /* Skip UART test during autoconfiguration */
+#define UN_AUTO_IRQ 0x0080 /* Do automatic IRQ during autoconfiguration */
+
+#define UN_SESSION_LOCKOUT 0x0100 /* Lock out cua opens based on session */
+#define UN_PGRP_LOCKOUT 0x0200 /* Lock out cua opens based on pgrp */
+#define UN_CALLOUT_NOHUP 0x0400 /* Don't do hangups for cua device */
+
+#define UN_FLAGS 0x0FFF /* Possible legal async flags */
+#define UN_USR_MASK 0x0430 /* Legal flags that non-privileged
+ * users can set or reset
+ */
+
+#define UN_INITIALIZED 0x80000000 /* Serial port was initialized */
+#define UN_CALLOUT_ACTIVE 0x40000000 /* Call out device is active */
+#define UN_NORMAL_ACTIVE 0x20000000 /* Normal device is active */
+#define UN_BOOT_AUTOCONF 0x10000000 /* Autoconfigure port on bootup */
+#define UN_CLOSING 0x08000000 /* Serial port is closing */
+#define UN_CTS_FLOW 0x04000000 /* Do CTS flow control */
+#define UN_CHECK_CD 0x02000000 /* i.e., CLOCAL */
+#define UN_SHARE_IRQ 0x01000000 /* for multifunction cards */
+
+
+/************************************************************************
+ * Structure for terminal or printer unit. struct un_struct
+ *
+ * Note that in some places the code assumes the "tty_t" is placed
+ * first in the structure.
+ ************************************************************************/
+
+struct un_struct {
+ struct tty_struct *un_tty; /* System TTY struct */
+ struct ch_struct *un_ch; /* Associated channel */
+
+ ushort un_open_count; /* Successful open count */
+ int un_flag; /* Unit flags */
+ ushort un_tbusy; /* Busy transmit count */
+
+ wait_queue_head_t un_open_wait;
+ wait_queue_head_t un_close_wait;
+ ushort un_type;
+ struct device *un_sysfs;
+};
+
+
+/************************************************************************
+ * Channel State Numbers for ch_state.
+ ************************************************************************/
+
+/*
+ * The ordering is important.
+ *
+ * state <= CS_WAIT_CANCEL implies the channel is definitely closed.
+ *
+ * state >= CS_WAIT_FAIL implies the channel is definitely open.
+ *
+ * state >= CS_READY implies data is allowed on the channel.
+ */
+
+enum dgrp_ch_state_t {
+ CS_IDLE = 0, /* Channel is idle */
+ CS_WAIT_OPEN = 1, /* Waiting for Immediate Open Resp */
+ CS_WAIT_CANCEL = 2, /* Waiting for Per/Incom Cancel Resp */
+ CS_WAIT_FAIL = 3, /* Waiting for Immed Open Failure */
+ CS_SEND_QUERY = 4, /* Ready to send Port Query */
+ CS_WAIT_QUERY = 5, /* Waiting for Port Query Response */
+ CS_READY = 6, /* Ready to accept commands and data */
+ CS_SEND_CLOSE = 7, /* Ready to send Close Request */
+ CS_WAIT_CLOSE = 8 /* Waiting for Close Response */
+};
+
+/************************************************************************
+ * Device flag definitions for ch_flag.
+ ************************************************************************/
+
+/*
+ * Note that the state of the two carrier based flags is key. When
+ * we check for carrier state transitions, we look at the current
+ * physical state of the DCD line and compare it with PHYS_CD (which
+ * was the state the last time we checked), and we also determine
+ * a new virtual state (composite of the physical state, FORCEDCD,
+ * CLOCAL, etc.) and compare it with VIRT_CD.
+ *
+ * VIRTUAL transitions high will have the side effect of waking blocked
+ * opens.
+ *
+ * PHYSICAL transitions low will cause hangups to occur _IF_ the virtual
+ * state is also low. We DON'T want to hangup on a PURE virtual drop.
+ */
+
+#define CH_HANGUP 0x00002 /* Server port ready to close */
+
+#define CH_VIRT_CD 0x00004 /* Carrier was virtually present */
+#define CH_PHYS_CD 0x00008 /* Carrier was physically present */
+
+#define CH_CLOCAL 0x00010 /* CLOCAL set in cflags */
+#define CH_BAUD0 0x00020 /* Baud rate zero hangup */
+
+#define CH_FAST_READ 0x00040 /* Fast reads are enabled */
+#define CH_FAST_WRITE 0x00080 /* Fast writes are enabled */
+
+#define CH_PRON 0x00100 /* Printer on string active */
+#define CH_RX_FLUSH 0x00200 /* Flushing receive data */
+#define CH_LOW 0x00400 /* Thread waiting for LOW water */
+#define CH_EMPTY 0x00800 /* Thread waiting for EMPTY */
+#define CH_DRAIN 0x01000 /* Close is waiting to drain */
+#define CH_INPUT 0x02000 /* Thread waiting for INPUT */
+#define CH_RXSTOP 0x04000 /* Stop output to ldisc */
+#define CH_PARAM 0x08000 /* A parameter was updated */
+#define CH_WAITING_SYNC 0x10000 /* A pending sync was assigned
+ * to this port.
+ */
+#define CH_PORT_GONE 0x20000 /* Port has disappeared */
+#define CH_TX_BREAK 0x40000 /* TX Break to be sent,
+ * but has not yet.
+ */
+
+/************************************************************************
+ * Types of Open Requests for ch_otype.
+ ************************************************************************/
+
+#define OTYPE_IMMEDIATE 0 /* Immediate Open */
+#define OTYPE_PERSISTENT 1 /* Persistent Open */
+#define OTYPE_INCOMING 2 /* Incoming Open */
+
+
+/************************************************************************
+ * Request/Response flags.
+ ************************************************************************/
+
+#define RR_SEQUENCE 0x0001 /* Get server RLAST, TIN */
+#define RR_STATUS 0x0002 /* Get server MINT, EINT */
+#define RR_BUFFER 0x0004 /* Get server RSIZE, TSIZE */
+#define RR_CAPABILITY 0x0008 /* Get server port capabilities */
+
+#define RR_TX_FLUSH 0x0040 /* Flush output buffers */
+#define RR_RX_FLUSH 0x0080 /* Flush input buffers */
+
+#define RR_TX_STOP 0x0100 /* Pause output */
+#define RR_RX_STOP 0x0200 /* Pause input */
+#define RR_TX_START 0x0400 /* Start output */
+#define RR_RX_START 0x0800 /* Start input */
+
+#define RR_TX_BREAK 0x1000 /* Send BREAK */
+#define RR_TX_ICHAR 0x2000 /* Send character immediate */
+
+
+/************************************************************************
+ * Channel information structure. struct ch_struct
+ ************************************************************************/
+
+struct ch_struct {
+ struct digi_struct ch_digi; /* Digi variables */
+ int ch_edelay; /* Digi edelay */
+
+ struct tty_port port;
+ struct un_struct ch_tun; /* Terminal unit info */
+ struct un_struct ch_pun; /* Printer unit info */
+
+ struct nd_struct *ch_nd; /* Node pointer */
+ u8 *ch_tbuf; /* Local Transmit Buffer */
+ u8 *ch_rbuf; /* Local Receive Buffer */
+ ulong ch_cpstime; /* Printer CPS time */
+ ulong ch_waketime; /* Printer wake time */
+
+ ulong ch_flag; /* CH_* flags */
+
+ enum dgrp_ch_state_t ch_state; /* CS_* Protocol state */
+ ushort ch_send; /* Bit vector of RR_* requests */
+ ushort ch_expect; /* Bit vector of RR_* responses */
+ ushort ch_wait_carrier; /* Thread count waiting for carrier */
+ ushort ch_wait_count[3]; /* Thread count waiting by otype */
+
+ ushort ch_portnum; /* Port number */
+ ushort ch_open_count; /* Successful open count */
+ ushort ch_category; /* Device category */
+ ushort ch_open_error; /* Last open error number */
+ ushort ch_break_time; /* Pending break request time */
+ ushort ch_cpsrem; /* Printer CPS remainder */
+ ushort ch_ocook; /* Realport fastcook oflags */
+ ushort ch_inwait; /* Thread count in CLIST input */
+
+ ushort ch_tin; /* Local transmit buffer in ptr */
+ ushort ch_tout; /* Local transmit buffer out ptr */
+ ushort ch_s_tin; /* Realport TIN */
+ ushort ch_s_tpos; /* Realport TPOS */
+ ushort ch_s_tsize; /* Realport TSIZE */
+ ushort ch_s_treq; /* Realport TREQ */
+ ushort ch_s_elast; /* Realport ELAST */
+
+ ushort ch_rin; /* Local receive buffer in ptr */
+ ushort ch_rout; /* Local receive buffer out ptr */
+ ushort ch_s_rin; /* Realport RIN */
+ /* David Fries 7-13-2001, ch_s_rin should be renamed ch_s_rout because
+ * the variable we want to represent is the PortServer's ROUT, which is
+ * the sequence number for the next byte the PortServer will send us.
+ * RIN is the sequence number for the next byte the PortServer will
+ * receive from the uart. The port server will send data as long as
+ * ROUT is less than RWIN. What would happen is the port is opened, it
+ * receives data, it gives the value of RIN, we set the RWIN to
+ * RIN+RBUF_MAX-1, it sends us RWIN-ROUT bytes which overflows. ROUT
+ * is set to zero when the port is opened, so we start at zero and
+ * count up as data is received.
+ */
+ ushort ch_s_rwin; /* Realport RWIN */
+ ushort ch_s_rsize; /* Realport RSIZE */
+
+ ushort ch_tmax; /* Local TMAX */
+ ushort ch_ttime; /* Local TTIME */
+ ushort ch_rmax; /* Local RMAX */
+ ushort ch_rtime; /* Local RTIME */
+ ushort ch_rlow; /* Local RLOW */
+ ushort ch_rhigh; /* Local RHIGH */
+
+ ushort ch_s_tmax; /* Realport TMAX */
+ ushort ch_s_ttime; /* Realport TTIME */
+ ushort ch_s_rmax; /* Realport RMAX */
+ ushort ch_s_rtime; /* Realport RTIME */
+ ushort ch_s_rlow; /* Realport RLOW */
+ ushort ch_s_rhigh; /* Realport RHIGH */
+
+ ushort ch_brate; /* Local baud rate */
+ ushort ch_cflag; /* Local tty cflags */
+ ushort ch_iflag; /* Local tty iflags */
+ ushort ch_oflag; /* Local tty oflags */
+ ushort ch_xflag; /* Local tty xflags */
+
+ ushort ch_s_brate; /* Realport BRATE */
+ ushort ch_s_cflag; /* Realport CFLAG */
+ ushort ch_s_iflag; /* Realport IFLAG */
+ ushort ch_s_oflag; /* Realport OFLAG */
+ ushort ch_s_xflag; /* Realport XFLAG */
+
+ u8 ch_otype; /* Open request type */
+ u8 ch_pscan_savechar; /* Last character read by parity scan */
+ u8 ch_pscan_state; /* PScan State based on last 2 chars */
+ u8 ch_otype_waiting; /* Type of open pending in server */
+ u8 ch_flush_seq; /* Receive flush end sequence */
+ u8 ch_s_mlast; /* Realport MLAST */
+
+ u8 ch_mout; /* Local MOUT */
+ u8 ch_mflow; /* Local MFLOW */
+ u8 ch_mctrl; /* Local MCTRL */
+ u8 ch_xon; /* Local XON */
+ u8 ch_xoff; /* Local XOFF */
+ u8 ch_lnext; /* Local LNEXT */
+ u8 ch_xxon; /* Local XXON */
+ u8 ch_xxoff; /* Local XXOFF */
+
+ u8 ch_s_mout; /* Realport MOUT */
+ u8 ch_s_mflow; /* Realport MFLOW */
+ u8 ch_s_mctrl; /* Realport MCTRL */
+ u8 ch_s_xon; /* Realport XON */
+ u8 ch_s_xoff; /* Realport XOFF */
+ u8 ch_s_lnext; /* Realport LNEXT */
+ u8 ch_s_xxon; /* Realport XXON */
+ u8 ch_s_xxoff; /* Realport XXOFF */
+
+ wait_queue_head_t ch_flag_wait; /* Wait queue for ch_flag changes */
+ wait_queue_head_t ch_sleep; /* Wait queue for my_sleep() */
+
+ int ch_custom_speed; /* Realport custom speed */
+ int ch_txcount; /* Running TX count */
+ int ch_rxcount; /* Running RX count */
+};
+
+
+/************************************************************************
+ * Node State definitions.
+ ************************************************************************/
+
+enum dgrp_nd_state_t {
+ NS_CLOSED = 0, /* Network device is closed */
+ NS_IDLE = 1, /* Network connection inactive */
+ NS_SEND_QUERY = 2, /* Send server query */
+ NS_WAIT_QUERY = 3, /* Wait for query response */
+ NS_READY = 4, /* Network ready */
+ NS_SEND_ERROR = 5 /* Must send error hangup */
+};
+
+#define ND_STATE_STR(x) \
+ ((x) == NS_CLOSED ? "CLOSED" : \
+ ((x) == NS_IDLE ? "IDLE" : \
+ ((x) == NS_SEND_QUERY ? "SEND_QUERY" : \
+ ((x) == NS_WAIT_QUERY ? "WAIT_QUERY" : \
+ ((x) == NS_READY ? "READY" : \
+ ((x) == NS_SEND_ERROR ? "SEND_ERROR" : "UNKNOWN"))))))
+
+/************************************************************************
+ * Node Flag definitions.
+ ************************************************************************/
+
+#define ND_SELECT 0x0001 /* Multiple net read selects */
+#define ND_DEB_WAIT 0x0002 /* Debug Device waiting */
+
+
+/************************************************************************
+ * Monitoring flag definitions.
+ ************************************************************************/
+
+#define MON_WAIT_DATA 0x0001 /* Waiting for buffer data */
+#define MON_WAIT_SPACE 0x0002 /* Waiting for buffer space */
+
+/************************************************************************
+ * DPA flag definitions.
+ ************************************************************************/
+
+#define DPA_WAIT_DATA 0x0001 /* Waiting for buffer data */
+#define DPA_WAIT_SPACE 0x0002 /* Waiting for buffer space */
+
+
+/************************************************************************
+ * Definitions taken from Realport Dump.
+ ************************************************************************/
+
+#define RPDUMP_MAGIC "Digi-RealPort-1.0"
+
+#define RPDUMP_MESSAGE 0xE2 /* Descriptive message */
+#define RPDUMP_RESET 0xE7 /* Connection reset */
+#define RPDUMP_CLIENT 0xE8 /* Client data */
+#define RPDUMP_SERVER 0xE9 /* Server data */
+
+
+/************************************************************************
+ * Node request/response definitions.
+ ************************************************************************/
+
+#define NR_ECHO 0x0001 /* Server echo packet */
+#define NR_IDENT 0x0002 /* Server Product ID */
+#define NR_CAPABILITY 0x0004 /* Server Capabilties */
+#define NR_VPD 0x0008 /* Server VPD, if any */
+#define NR_PASSWORD 0x0010 /* Server Password */
+
+/************************************************************************
+ * Registration status of the node's Linux struct tty_driver structures.
+ ************************************************************************/
+#define SERIAL_TTDRV_REG 0x0001 /* nd_serial_ttdriver registered */
+#define CALLOUT_TTDRV_REG 0x0002 /* nd_callout_ttdriver registered */
+#define XPRINT_TTDRV_REG 0x0004 /* nd_xprint_ttdriver registered */
+
+
+/************************************************************************
+ * Node structure. There exists one of these for each associated
+ * realport server.
+ ************************************************************************/
+
+struct nd_struct {
+ struct list_head list;
+ long nd_major; /* Node's major number */
+ long nd_ID; /* Node's ID code */
+
+ char nd_serial_name[50]; /* "tty_dgrp_<id>_" + null */
+ char nd_callout_name[50]; /* "cu_dgrp_<id>_" + null */
+ char nd_xprint_name[50]; /* "pr_dgrp_<id>_" + null */
+
+ char password[16]; /* Password for server, if needed */
+ int nd_tty_ref_cnt; /* Linux tty reference count */
+
+ struct proc_dir_entry *nd_net_de; /* Dir entry for /proc/dgrp/net */
+ struct proc_dir_entry *nd_mon_de; /* Dir entry for /proc/dgrp/mon */
+ struct proc_dir_entry *nd_ports_de; /* Dir entry for /proc/dgrp/ports*/
+ struct proc_dir_entry *nd_dpa_de; /* Dir entry for /proc/dgrp/dpa */
+
+ spinlock_t nd_lock; /* General node lock */
+
+ struct semaphore nd_net_semaphore; /* Net read/write lock */
+ struct semaphore nd_mon_semaphore; /* Monitor buffer lock */
+ spinlock_t nd_dpa_lock; /* DPA buffer lock */
+
+ enum dgrp_nd_state_t nd_state; /* NS_* network state */
+ int nd_chan_count; /* # active channels */
+ int nd_flag; /* Node flags */
+ int nd_send; /* Responses to send */
+ int nd_expect; /* Responses we expect */
+
+ u8 *nd_iobuf; /* Network R/W Buffer */
+ wait_queue_head_t nd_tx_waitq; /* Network select wait queue */
+
+ u8 *nd_inputbuf; /* Input Buffer */
+ u8 *nd_inputflagbuf; /* Input Flags Buffer */
+
+ int nd_tx_deposit; /* Accumulated transmit deposits */
+ int nd_tx_charge; /* Accumulated transmit charges */
+ int nd_tx_credit; /* Current TX credit */
+ int nd_tx_ready; /* Ready to transmit */
+ int nd_tx_work; /* TX work waiting */
+ ulong nd_tx_time; /* Last transmit time */
+ ulong nd_poll_time; /* Next scheduled poll time */
+
+ int nd_delay; /* Current TX delay */
+ int nd_rate; /* Current TX rate */
+ struct link_struct nd_link; /* Link speed params. */
+
+ int nd_seq_in; /* TX seq in ptr */
+ int nd_seq_out; /* TX seq out ptr */
+ int nd_unack; /* Unacknowledged byte count */
+ int nd_remain; /* Remaining receive bytes */
+ int nd_tx_module; /* Current TX module # */
+ int nd_rx_module; /* Current RX module # */
+ char *nd_error; /* Protocol error message */
+
+ int nd_write_count; /* drp_write() call count */
+ int nd_read_count; /* drp_read() count */
+ int nd_send_count; /* TCP message sent */
+ int nd_tx_byte; /* Transmit byte count */
+ int nd_rx_byte; /* Receive byte count */
+
+ ulong nd_mon_lbolt; /* Monitor start time */
+ int nd_mon_flag; /* Monitor flags */
+ int nd_mon_in; /* Monitor in pointer */
+ int nd_mon_out; /* Monitor out pointer */
+ wait_queue_head_t nd_mon_wqueue; /* Monitor wait queue (on flags) */
+ u8 *nd_mon_buf; /* Monitor buffer */
+
+ ulong nd_dpa_lbolt; /* DPA start time */
+ int nd_dpa_flag; /* DPA flags */
+ int nd_dpa_in; /* DPA in pointer */
+ int nd_dpa_out; /* DPA out pointer */
+ wait_queue_head_t nd_dpa_wqueue; /* DPA wait queue (on flags) */
+ u8 *nd_dpa_buf; /* DPA buffer */
+
+ uint nd_dpa_debug;
+ uint nd_dpa_port;
+
+ wait_queue_head_t nd_seq_wque[SEQ_MAX]; /* TX thread wait queues */
+ u8 nd_seq_wait[SEQ_MAX]; /* Transmit thread wait count */
+
+ ushort nd_seq_size[SEQ_MAX]; /* Transmit seq packet size */
+ ulong nd_seq_time[SEQ_MAX]; /* Transmit seq packet time */
+
+ ushort nd_hw_ver; /* HW version returned from PS */
+ ushort nd_sw_ver; /* SW version returned from PS */
+ uint nd_hw_id; /* HW ID returned from PS */
+ u8 nd_ps_desc[MAX_DESC_LEN+1]; /* Description from PS */
+ uint nd_vpd_len; /* VPD len, if any */
+ u8 nd_vpd[VPDSIZE]; /* VPD, if any */
+
+ ulong nd_ttdriver_flags; /* Registration status */
+ struct tty_driver *nd_serial_ttdriver; /* Linux TTYDRIVER structure */
+ struct tty_driver *nd_callout_ttdriver; /* Linux TTYDRIVER structure */
+ struct tty_driver *nd_xprint_ttdriver; /* Linux TTYDRIVER structure */
+
+ u8 *nd_writebuf; /* Used to cache data read
+ * from user
+ */
+ struct ch_struct nd_chan[CHAN_MAX]; /* Channel array */
+ struct device *nd_class_dev; /* Hang our sysfs stuff off of here */
+};
+
+#endif /* __DRP_H */
projects / profile / ivi / kernel-adaptation-intel-automotive.git / commitdiff