+++ /dev/null
-/*********************************************************************
- *
- * Filename: irport.c
- * Version: 1.0
- * Description: Half duplex serial port SIR driver for IrDA.
- * Status: Experimental.
- * Author: Dag Brattli <dagb@cs.uit.no>
- * Created at: Sun Aug 3 13:49:59 1997
- * Modified at: Fri Jan 28 20:22:38 2000
- * Modified by: Dag Brattli <dagb@cs.uit.no>
- * Sources: serial.c by Linus Torvalds
- *
- * Copyright (c) 1997, 1998, 1999-2000 Dag Brattli, All Rights Reserved.
- * Copyright (c) 2000-2003 Jean Tourrilhes, All Rights Reserved.
- *
- * 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 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; 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., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- *
- * This driver is ment to be a small half duplex serial driver to be
- * used for IR-chipsets that has a UART (16550) compatibility mode.
- * Eventually it will replace irtty, because of irtty has some
- * problems that is hard to get around when we don't have control
- * over the serial driver. This driver may also be used by FIR
- * drivers to handle SIR mode for them.
- *
- ********************************************************************/
-
-#include <linux/module.h>
-
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/ioport.h>
-#include <linux/slab.h>
-#include <linux/string.h>
-#include <linux/skbuff.h>
-#include <linux/serial_reg.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/spinlock.h>
-#include <linux/delay.h>
-#include <linux/rtnetlink.h>
-#include <linux/bitops.h>
-
-#include <asm/system.h>
-#include <asm/io.h>
-
-#include <net/irda/irda.h>
-#include <net/irda/wrapper.h>
-#include "irport.h"
-
-#define IO_EXTENT 8
-
-/*
- * Currently you'll need to set these values using insmod like this:
- * insmod irport io=0x3e8 irq=11
- */
-static unsigned int io[] = { ~0, ~0, ~0, ~0 };
-static unsigned int irq[] = { 0, 0, 0, 0 };
-
-static unsigned int qos_mtt_bits = 0x03;
-
-static struct irport_cb *dev_self[] = { NULL, NULL, NULL, NULL};
-static char *driver_name = "irport";
-
-static inline void irport_write_wakeup(struct irport_cb *self);
-static inline int irport_write(int iobase, int fifo_size, __u8 *buf, int len);
-static inline void irport_receive(struct irport_cb *self);
-
-static int irport_net_ioctl(struct net_device *dev, struct ifreq *rq,
- int cmd);
-static inline int irport_is_receiving(struct irport_cb *self);
-static int irport_set_dtr_rts(struct net_device *dev, int dtr, int rts);
-static int irport_raw_write(struct net_device *dev, __u8 *buf, int len);
-static struct net_device_stats *irport_net_get_stats(struct net_device *dev);
-static int irport_change_speed_complete(struct irda_task *task);
-static void irport_timeout(struct net_device *dev);
-
-static irqreturn_t irport_interrupt(int irq, void *dev_id);
-static int irport_hard_xmit(struct sk_buff *skb, struct net_device *dev);
-static void irport_change_speed(void *priv, __u32 speed);
-static int irport_net_open(struct net_device *dev);
-static int irport_net_close(struct net_device *dev);
-
-static struct irport_cb *
-irport_open(int i, unsigned int iobase, unsigned int irq)
-{
- struct net_device *dev;
- struct irport_cb *self;
-
- IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
-
- /* Lock the port that we need */
- if (!request_region(iobase, IO_EXTENT, driver_name)) {
- IRDA_DEBUG(0, "%s(), can't get iobase of 0x%03x\n",
- __FUNCTION__, iobase);
- goto err_out1;
- }
-
- /*
- * Allocate new instance of the driver
- */
- dev = alloc_irdadev(sizeof(struct irport_cb));
- if (!dev) {
- IRDA_ERROR("%s(), can't allocate memory for "
- "irda device!\n", __FUNCTION__);
- goto err_out2;
- }
-
- self = dev->priv;
- spin_lock_init(&self->lock);
-
- /* Need to store self somewhere */
- dev_self[i] = self;
- self->priv = self;
- self->index = i;
-
- /* Initialize IO */
- self->io.sir_base = iobase;
- self->io.sir_ext = IO_EXTENT;
- self->io.irq = irq;
- self->io.fifo_size = 16; /* 16550A and compatible */
-
- /* Initialize QoS for this device */
- irda_init_max_qos_capabilies(&self->qos);
-
- self->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
- IR_115200;
-
- self->qos.min_turn_time.bits = qos_mtt_bits;
- irda_qos_bits_to_value(&self->qos);
-
- /* Bootstrap ZeroCopy Rx */
- self->rx_buff.truesize = IRDA_SKB_MAX_MTU;
- self->rx_buff.skb = __dev_alloc_skb(self->rx_buff.truesize,
- GFP_KERNEL);
- if (self->rx_buff.skb == NULL) {
- IRDA_ERROR("%s(), can't allocate memory for "
- "receive buffer!\n", __FUNCTION__);
- goto err_out3;
- }
- skb_reserve(self->rx_buff.skb, 1);
- self->rx_buff.head = self->rx_buff.skb->data;
- /* No need to memset the buffer, unless you are really pedantic */
-
- /* Finish setup the Rx buffer descriptor */
- self->rx_buff.in_frame = FALSE;
- self->rx_buff.state = OUTSIDE_FRAME;
- self->rx_buff.data = self->rx_buff.head;
-
- /* Specify how much memory we want */
- self->tx_buff.truesize = 4000;
-
- /* Allocate memory if needed */
- if (self->tx_buff.truesize > 0) {
- self->tx_buff.head = kzalloc(self->tx_buff.truesize,
- GFP_KERNEL);
- if (self->tx_buff.head == NULL) {
- IRDA_ERROR("%s(), can't allocate memory for "
- "transmit buffer!\n", __FUNCTION__);
- goto err_out4;
- }
- }
- self->tx_buff.data = self->tx_buff.head;
-
- self->netdev = dev;
-
- /* May be overridden by piggyback drivers */
- self->interrupt = irport_interrupt;
- self->change_speed = irport_change_speed;
-
- /* Override the network functions we need to use */
- dev->hard_start_xmit = irport_hard_xmit;
- dev->tx_timeout = irport_timeout;
- dev->watchdog_timeo = HZ; /* Allow time enough for speed change */
- dev->open = irport_net_open;
- dev->stop = irport_net_close;
- dev->get_stats = irport_net_get_stats;
- dev->do_ioctl = irport_net_ioctl;
-
- /* Make ifconfig display some details */
- dev->base_addr = iobase;
- dev->irq = irq;
-
- if (register_netdev(dev)) {
- IRDA_ERROR("%s(), register_netdev() failed!\n", __FUNCTION__);
- goto err_out5;
- }
- IRDA_MESSAGE("IrDA: Registered device %s (irport io=0x%X irq=%d)\n",
- dev->name, iobase, irq);
-
- return self;
- err_out5:
- kfree(self->tx_buff.head);
- err_out4:
- kfree_skb(self->rx_buff.skb);
- err_out3:
- free_netdev(dev);
- dev_self[i] = NULL;
- err_out2:
- release_region(iobase, IO_EXTENT);
- err_out1:
- return NULL;
-}
-
-static int irport_close(struct irport_cb *self)
-{
- IRDA_ASSERT(self != NULL, return -1;);
-
- /* We are not using any dongle anymore! */
- if (self->dongle)
- irda_device_dongle_cleanup(self->dongle);
- self->dongle = NULL;
-
- /* Remove netdevice */
- unregister_netdev(self->netdev);
-
- /* Release the IO-port that this driver is using */
- IRDA_DEBUG(0 , "%s(), Releasing Region %03x\n",
- __FUNCTION__, self->io.sir_base);
- release_region(self->io.sir_base, self->io.sir_ext);
-
- kfree(self->tx_buff.head);
-
- if (self->rx_buff.skb)
- kfree_skb(self->rx_buff.skb);
- self->rx_buff.skb = NULL;
-
- /* Remove ourselves */
- dev_self[self->index] = NULL;
- free_netdev(self->netdev);
-
- return 0;
-}
-
-static void irport_stop(struct irport_cb *self)
-{
- int iobase;
-
- iobase = self->io.sir_base;
-
- /* We can't lock, we may be called from a FIR driver - Jean II */
-
- /* We are not transmitting any more */
- self->transmitting = 0;
-
- /* Reset UART */
- outb(0, iobase+UART_MCR);
-
- /* Turn off interrupts */
- outb(0, iobase+UART_IER);
-}
-
-static void irport_start(struct irport_cb *self)
-{
- int iobase;
-
- iobase = self->io.sir_base;
-
- irport_stop(self);
-
- /* We can't lock, we may be called from a FIR driver - Jean II */
-
- /* Initialize UART */
- outb(UART_LCR_WLEN8, iobase+UART_LCR); /* Reset DLAB */
- outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase+UART_MCR);
-
- /* Turn on interrups */
- outb(UART_IER_RLSI | UART_IER_RDI |UART_IER_THRI, iobase+UART_IER);
-}
-
-/*
- * Function irport_get_fcr (speed)
- *
- * Compute value of fcr
- *
- */
-static inline unsigned int irport_get_fcr(__u32 speed)
-{
- unsigned int fcr; /* FIFO control reg */
-
- /* Enable fifos */
- fcr = UART_FCR_ENABLE_FIFO;
-
- /*
- * Use trigger level 1 to avoid 3 ms. timeout delay at 9600 bps, and
- * almost 1,7 ms at 19200 bps. At speeds above that we can just forget
- * about this timeout since it will always be fast enough.
- */
- if (speed < 38400)
- fcr |= UART_FCR_TRIGGER_1;
- else
- //fcr |= UART_FCR_TRIGGER_14;
- fcr |= UART_FCR_TRIGGER_8;
-
- return(fcr);
-}
-
-/*
- * Function irport_change_speed (self, speed)
- *
- * Set speed of IrDA port to specified baudrate
- *
- * This function should be called with irq off and spin-lock.
- */
-static void irport_change_speed(void *priv, __u32 speed)
-{
- struct irport_cb *self = (struct irport_cb *) priv;
- int iobase;
- unsigned int fcr; /* FIFO control reg */
- unsigned int lcr; /* Line control reg */
- int divisor;
-
- IRDA_ASSERT(self != NULL, return;);
- IRDA_ASSERT(speed != 0, return;);
-
- IRDA_DEBUG(1, "%s(), Setting speed to: %d - iobase=%#x\n",
- __FUNCTION__, speed, self->io.sir_base);
-
- /* We can't lock, we may be called from a FIR driver - Jean II */
-
- iobase = self->io.sir_base;
-
- /* Update accounting for new speed */
- self->io.speed = speed;
-
- /* Turn off interrupts */
- outb(0, iobase+UART_IER);
-
- divisor = SPEED_MAX/speed;
-
- /* Get proper fifo configuration */
- fcr = irport_get_fcr(speed);
-
- /* IrDA ports use 8N1 */
- lcr = UART_LCR_WLEN8;
-
- outb(UART_LCR_DLAB | lcr, iobase+UART_LCR); /* Set DLAB */
- outb(divisor & 0xff, iobase+UART_DLL); /* Set speed */
- outb(divisor >> 8, iobase+UART_DLM);
- outb(lcr, iobase+UART_LCR); /* Set 8N1 */
- outb(fcr, iobase+UART_FCR); /* Enable FIFO's */
-
- /* Turn on interrups */
- /* This will generate a fatal interrupt storm.
- * People calling us will do that properly - Jean II */
- //outb(/*UART_IER_RLSI|*/UART_IER_RDI/*|UART_IER_THRI*/, iobase+UART_IER);
-}
-
-/*
- * Function __irport_change_speed (instance, state, param)
- *
- * State machine for changing speed of the device. We do it this way since
- * we cannot use schedule_timeout() when we are in interrupt context
- *
- */
-static int __irport_change_speed(struct irda_task *task)
-{
- struct irport_cb *self;
- __u32 speed = (__u32) task->param;
- unsigned long flags = 0;
- int wasunlocked = 0;
- int ret = 0;
-
- IRDA_DEBUG(2, "%s(), <%ld>\n", __FUNCTION__, jiffies);
-
- self = (struct irport_cb *) task->instance;
-
- IRDA_ASSERT(self != NULL, return -1;);
-
- /* Locking notes : this function may be called from irq context with
- * spinlock, via irport_write_wakeup(), or from non-interrupt without
- * spinlock (from the task timer). Yuck !
- * This is ugly, and unsafe is the spinlock is not already acquired.
- * This will be fixed when irda-task get rewritten.
- * Jean II */
- if (!spin_is_locked(&self->lock)) {
- spin_lock_irqsave(&self->lock, flags);
- wasunlocked = 1;
- }
-
- switch (task->state) {
- case IRDA_TASK_INIT:
- case IRDA_TASK_WAIT:
- /* Are we ready to change speed yet? */
- if (self->tx_buff.len > 0) {
- task->state = IRDA_TASK_WAIT;
-
- /* Try again later */
- ret = msecs_to_jiffies(20);
- break;
- }
-
- if (self->dongle)
- irda_task_next_state(task, IRDA_TASK_CHILD_INIT);
- else
- irda_task_next_state(task, IRDA_TASK_CHILD_DONE);
- break;
- case IRDA_TASK_CHILD_INIT:
- /* Go to default speed */
- self->change_speed(self->priv, 9600);
-
- /* Change speed of dongle */
- if (irda_task_execute(self->dongle,
- self->dongle->issue->change_speed,
- NULL, task, (void *) speed))
- {
- /* Dongle need more time to change its speed */
- irda_task_next_state(task, IRDA_TASK_CHILD_WAIT);
-
- /* Give dongle 1 sec to finish */
- ret = msecs_to_jiffies(1000);
- } else
- /* Child finished immediately */
- irda_task_next_state(task, IRDA_TASK_CHILD_DONE);
- break;
- case IRDA_TASK_CHILD_WAIT:
- IRDA_WARNING("%s(), changing speed of dongle timed out!\n", __FUNCTION__);
- ret = -1;
- break;
- case IRDA_TASK_CHILD_DONE:
- /* Finally we are ready to change the speed */
- self->change_speed(self->priv, speed);
-
- irda_task_next_state(task, IRDA_TASK_DONE);
- break;
- default:
- IRDA_ERROR("%s(), unknown state %d\n",
- __FUNCTION__, task->state);
- irda_task_next_state(task, IRDA_TASK_DONE);
- ret = -1;
- break;
- }
- /* Put stuff in the state we found them - Jean II */
- if(wasunlocked) {
- spin_unlock_irqrestore(&self->lock, flags);
- }
-
- return ret;
-}
-
-/*
- * Function irport_change_speed_complete (task)
- *
- * Called when the change speed operation completes
- *
- */
-static int irport_change_speed_complete(struct irda_task *task)
-{
- struct irport_cb *self;
-
- IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
-
- self = (struct irport_cb *) task->instance;
-
- IRDA_ASSERT(self != NULL, return -1;);
- IRDA_ASSERT(self->netdev != NULL, return -1;);
-
- /* Finished changing speed, so we are not busy any longer */
- /* Signal network layer so it can try to send the frame */
-
- netif_wake_queue(self->netdev);
-
- return 0;
-}
-
-/*
- * Function irport_timeout (struct net_device *dev)
- *
- * The networking layer thinks we timed out.
- *
- */
-
-static void irport_timeout(struct net_device *dev)
-{
- struct irport_cb *self;
- int iobase;
- int iir, lsr;
- unsigned long flags;
-
- self = (struct irport_cb *) dev->priv;
- IRDA_ASSERT(self != NULL, return;);
- iobase = self->io.sir_base;
-
- IRDA_WARNING("%s: transmit timed out, jiffies = %ld, trans_start = %ld\n",
- dev->name, jiffies, dev->trans_start);
- spin_lock_irqsave(&self->lock, flags);
-
- /* Debug what's happening... */
-
- /* Get interrupt status */
- lsr = inb(iobase+UART_LSR);
- /* Read interrupt register */
- iir = inb(iobase+UART_IIR);
- IRDA_DEBUG(0, "%s(), iir=%02x, lsr=%02x, iobase=%#x\n",
- __FUNCTION__, iir, lsr, iobase);
-
- IRDA_DEBUG(0, "%s(), transmitting=%d, remain=%d, done=%td\n",
- __FUNCTION__, self->transmitting, self->tx_buff.len,
- self->tx_buff.data - self->tx_buff.head);
-
- /* Now, restart the port */
- irport_start(self);
- self->change_speed(self->priv, self->io.speed);
- /* This will re-enable irqs */
- outb(/*UART_IER_RLSI|*/UART_IER_RDI/*|UART_IER_THRI*/, iobase+UART_IER);
- dev->trans_start = jiffies;
- spin_unlock_irqrestore(&self->lock, flags);
-
- netif_wake_queue(dev);
-}
-
-/*
- * Function irport_wait_hw_transmitter_finish ()
- *
- * Wait for the real end of HW transmission
- *
- * The UART is a strict FIFO, and we get called only when we have finished
- * pushing data to the FIFO, so the maximum amount of time we must wait
- * is only for the FIFO to drain out.
- *
- * We use a simple calibrated loop. We may need to adjust the loop
- * delay (udelay) to balance I/O traffic and latency. And we also need to
- * adjust the maximum timeout.
- * It would probably be better to wait for the proper interrupt,
- * but it doesn't seem to be available.
- *
- * We can't use jiffies or kernel timers because :
- * 1) We are called from the interrupt handler, which disable softirqs,
- * so jiffies won't be increased
- * 2) Jiffies granularity is usually very coarse (10ms), and we don't
- * want to wait that long to detect stuck hardware.
- * Jean II
- */
-
-static void irport_wait_hw_transmitter_finish(struct irport_cb *self)
-{
- int iobase;
- int count = 1000; /* 1 ms */
-
- iobase = self->io.sir_base;
-
- /* Calibrated busy loop */
- while((count-- > 0) && !(inb(iobase+UART_LSR) & UART_LSR_TEMT))
- udelay(1);
-
- if(count == 0)
- IRDA_DEBUG(0, "%s(): stuck transmitter\n", __FUNCTION__);
-}
-
-/*
- * Function irport_hard_start_xmit (struct sk_buff *skb, struct net_device *dev)
- *
- * Transmits the current frame until FIFO is full, then
- * waits until the next transmitt interrupt, and continues until the
- * frame is transmitted.
- */
-static int irport_hard_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- struct irport_cb *self;
- unsigned long flags;
- int iobase;
- s32 speed;
-
- IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
-
- IRDA_ASSERT(dev != NULL, return 0;);
-
- self = (struct irport_cb *) dev->priv;
- IRDA_ASSERT(self != NULL, return 0;);
-
- iobase = self->io.sir_base;
-
- netif_stop_queue(dev);
-
- /* Make sure tests & speed change are atomic */
- spin_lock_irqsave(&self->lock, flags);
-
- /* Check if we need to change the speed */
- speed = irda_get_next_speed(skb);
- if ((speed != self->io.speed) && (speed != -1)) {
- /* Check for empty frame */
- if (!skb->len) {
- /*
- * We send frames one by one in SIR mode (no
- * pipelining), so at this point, if we were sending
- * a previous frame, we just received the interrupt
- * telling us it is finished (UART_IIR_THRI).
- * Therefore, waiting for the transmitter to really
- * finish draining the fifo won't take too long.
- * And the interrupt handler is not expected to run.
- * - Jean II */
- irport_wait_hw_transmitter_finish(self);
- /* Better go there already locked - Jean II */
- irda_task_execute(self, __irport_change_speed,
- irport_change_speed_complete,
- NULL, (void *) speed);
- dev->trans_start = jiffies;
- spin_unlock_irqrestore(&self->lock, flags);
- dev_kfree_skb(skb);
- return 0;
- } else
- self->new_speed = speed;
- }
-
- /* Init tx buffer */
- self->tx_buff.data = self->tx_buff.head;
-
- /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
- self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data,
- self->tx_buff.truesize);
-
- self->stats.tx_bytes += self->tx_buff.len;
-
- /* We are transmitting */
- self->transmitting = 1;
-
- /* Turn on transmit finished interrupt. Will fire immediately! */
- outb(UART_IER_THRI, iobase+UART_IER);
-
- dev->trans_start = jiffies;
- spin_unlock_irqrestore(&self->lock, flags);
-
- dev_kfree_skb(skb);
-
- return 0;
-}
-
-/*
- * Function irport_write (driver)
- *
- * Fill Tx FIFO with transmit data
- *
- * Called only from irport_write_wakeup()
- */
-static inline int irport_write(int iobase, int fifo_size, __u8 *buf, int len)
-{
- int actual = 0;
-
- /* Fill FIFO with current frame */
- while ((actual < fifo_size) && (actual < len)) {
- /* Transmit next byte */
- outb(buf[actual], iobase+UART_TX);
-
- actual++;
- }
-
- return actual;
-}
-
-/*
- * Function irport_write_wakeup (tty)
- *
- * Called by the driver when there's room for more data. If we have
- * more packets to send, we send them here.
- *
- * Called only from irport_interrupt()
- * Make sure this function is *not* called while we are receiving,
- * otherwise we will reset fifo and loose data :-(
- */
-static inline void irport_write_wakeup(struct irport_cb *self)
-{
- int actual = 0;
- int iobase;
- unsigned int fcr;
-
- IRDA_ASSERT(self != NULL, return;);
-
- IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
-
- iobase = self->io.sir_base;
-
- /* Finished with frame? */
- if (self->tx_buff.len > 0) {
- /* Write data left in transmit buffer */
- actual = irport_write(iobase, self->io.fifo_size,
- self->tx_buff.data, self->tx_buff.len);
- self->tx_buff.data += actual;
- self->tx_buff.len -= actual;
- } else {
- /*
- * Now serial buffer is almost free & we can start
- * transmission of another packet. But first we must check
- * if we need to change the speed of the hardware
- */
- if (self->new_speed) {
- irport_wait_hw_transmitter_finish(self);
- irda_task_execute(self, __irport_change_speed,
- irport_change_speed_complete,
- NULL, (void *) self->new_speed);
- self->new_speed = 0;
- } else {
- /* Tell network layer that we want more frames */
- netif_wake_queue(self->netdev);
- }
- self->stats.tx_packets++;
-
- /*
- * Reset Rx FIFO to make sure that all reflected transmit data
- * is discarded. This is needed for half duplex operation
- */
- fcr = irport_get_fcr(self->io.speed);
- fcr |= UART_FCR_CLEAR_RCVR;
- outb(fcr, iobase+UART_FCR);
-
- /* Finished transmitting */
- self->transmitting = 0;
-
- /* Turn on receive interrupts */
- outb(UART_IER_RDI, iobase+UART_IER);
-
- IRDA_DEBUG(1, "%s() : finished Tx\n", __FUNCTION__);
- }
-}
-
-/*
- * Function irport_receive (self)
- *
- * Receive one frame from the infrared port
- *
- * Called only from irport_interrupt()
- */
-static inline void irport_receive(struct irport_cb *self)
-{
- int boguscount = 0;
- int iobase;
-
- IRDA_ASSERT(self != NULL, return;);
-
- iobase = self->io.sir_base;
-
- /*
- * Receive all characters in Rx FIFO, unwrap and unstuff them.
- * async_unwrap_char will deliver all found frames
- */
- do {
- async_unwrap_char(self->netdev, &self->stats, &self->rx_buff,
- inb(iobase+UART_RX));
-
- /* Make sure we don't stay here too long */
- if (boguscount++ > 32) {
- IRDA_DEBUG(2,"%s(), breaking!\n", __FUNCTION__);
- break;
- }
- } while (inb(iobase+UART_LSR) & UART_LSR_DR);
-}
-
-/*
- * Function irport_interrupt (irq, dev_id)
- *
- * Interrupt handler
- */
-static irqreturn_t irport_interrupt(int irq, void *dev_id)
-{
- struct net_device *dev = dev_id;
- struct irport_cb *self;
- int boguscount = 0;
- int iobase;
- int iir, lsr;
- int handled = 0;
-
- self = dev->priv;
-
- spin_lock(&self->lock);
-
- iobase = self->io.sir_base;
-
- /* Cut'n'paste interrupt routine from serial.c
- * This version try to minimise latency and I/O operations.
- * Simplified and modified to enforce half duplex operation.
- * - Jean II */
-
- /* Check status even is iir reg is cleared, more robust and
- * eliminate a read on the I/O bus - Jean II */
- do {
- /* Get interrupt status ; Clear interrupt */
- lsr = inb(iobase+UART_LSR);
-
- /* Are we receiving or transmitting ? */
- if(!self->transmitting) {
- /* Received something ? */
- if (lsr & UART_LSR_DR)
- irport_receive(self);
- } else {
- /* Room in Tx fifo ? */
- if (lsr & (UART_LSR_THRE | UART_LSR_TEMT))
- irport_write_wakeup(self);
- }
-
- /* A bit hackish, but working as expected... Jean II */
- if(lsr & (UART_LSR_THRE | UART_LSR_TEMT | UART_LSR_DR))
- handled = 1;
-
- /* Make sure we don't stay here to long */
- if (boguscount++ > 10) {
- IRDA_WARNING("%s() irq handler looping : lsr=%02x\n",
- __FUNCTION__, lsr);
- break;
- }
-
- /* Read interrupt register */
- iir = inb(iobase+UART_IIR);
-
- /* Enable this debug only when no other options and at low
- * bit rates, otherwise it may cause Rx overruns (lsr=63).
- * - Jean II */
- IRDA_DEBUG(6, "%s(), iir=%02x, lsr=%02x, iobase=%#x\n",
- __FUNCTION__, iir, lsr, iobase);
-
- /* As long as interrupt pending... */
- } while ((iir & UART_IIR_NO_INT) == 0);
-
- spin_unlock(&self->lock);
- return IRQ_RETVAL(handled);
-}
-
-/*
- * Function irport_net_open (dev)
- *
- * Network device is taken up. Usually this is done by "ifconfig irda0 up"
- *
- */
-static int irport_net_open(struct net_device *dev)
-{
- struct irport_cb *self;
- int iobase;
- char hwname[16];
- unsigned long flags;
-
- IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
-
- IRDA_ASSERT(dev != NULL, return -1;);
- self = (struct irport_cb *) dev->priv;
-
- iobase = self->io.sir_base;
-
- if (request_irq(self->io.irq, self->interrupt, 0, dev->name,
- (void *) dev)) {
- IRDA_DEBUG(0, "%s(), unable to allocate irq=%d\n",
- __FUNCTION__, self->io.irq);
- return -EAGAIN;
- }
-
- spin_lock_irqsave(&self->lock, flags);
- /* Init uart */
- irport_start(self);
- /* Set 9600 bauds per default, including at the dongle */
- irda_task_execute(self, __irport_change_speed,
- irport_change_speed_complete,
- NULL, (void *) 9600);
- spin_unlock_irqrestore(&self->lock, flags);
-
-
- /* Give self a hardware name */
- sprintf(hwname, "SIR @ 0x%03x", self->io.sir_base);
-
- /*
- * Open new IrLAP layer instance, now that everything should be
- * initialized properly
- */
- self->irlap = irlap_open(dev, &self->qos, hwname);
-
- /* Ready to play! */
-
- netif_start_queue(dev);
-
- return 0;
-}
-
-/*
- * Function irport_net_close (self)
- *
- * Network device is taken down. Usually this is done by
- * "ifconfig irda0 down"
- */
-static int irport_net_close(struct net_device *dev)
-{
- struct irport_cb *self;
- int iobase;
- unsigned long flags;
-
- IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
-
- IRDA_ASSERT(dev != NULL, return -1;);
- self = (struct irport_cb *) dev->priv;
-
- IRDA_ASSERT(self != NULL, return -1;);
-
- iobase = self->io.sir_base;
-
- /* Stop device */
- netif_stop_queue(dev);
-
- /* Stop and remove instance of IrLAP */
- if (self->irlap)
- irlap_close(self->irlap);
- self->irlap = NULL;
-
- spin_lock_irqsave(&self->lock, flags);
- irport_stop(self);
- spin_unlock_irqrestore(&self->lock, flags);
-
- free_irq(self->io.irq, dev);
-
- return 0;
-}
-
-/*
- * Function irport_is_receiving (self)
- *
- * Returns true is we are currently receiving data
- *
- */
-static inline int irport_is_receiving(struct irport_cb *self)
-{
- return (self->rx_buff.state != OUTSIDE_FRAME);
-}
-
-/*
- * Function irport_set_dtr_rts (tty, dtr, rts)
- *
- * This function can be used by dongles etc. to set or reset the status
- * of the dtr and rts lines
- */
-static int irport_set_dtr_rts(struct net_device *dev, int dtr, int rts)
-{
- struct irport_cb *self = dev->priv;
- int iobase;
-
- IRDA_ASSERT(self != NULL, return -1;);
-
- iobase = self->io.sir_base;
-
- if (dtr)
- dtr = UART_MCR_DTR;
- if (rts)
- rts = UART_MCR_RTS;
-
- outb(dtr|rts|UART_MCR_OUT2, iobase+UART_MCR);
-
- return 0;
-}
-
-static int irport_raw_write(struct net_device *dev, __u8 *buf, int len)
-{
- struct irport_cb *self = (struct irport_cb *) dev->priv;
- int actual = 0;
- int iobase;
-
- IRDA_ASSERT(self != NULL, return -1;);
-
- iobase = self->io.sir_base;
-
- /* Tx FIFO should be empty! */
- if (!(inb(iobase+UART_LSR) & UART_LSR_THRE)) {
- IRDA_DEBUG( 0, "%s(), failed, fifo not empty!\n", __FUNCTION__);
- return -1;
- }
-
- /* Fill FIFO with current frame */
- while (actual < len) {
- /* Transmit next byte */
- outb(buf[actual], iobase+UART_TX);
- actual++;
- }
-
- return actual;
-}
-
-/*
- * Function irport_net_ioctl (dev, rq, cmd)
- *
- * Process IOCTL commands for this device
- *
- */
-static int irport_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
-{
- struct if_irda_req *irq = (struct if_irda_req *) rq;
- struct irport_cb *self;
- dongle_t *dongle;
- unsigned long flags;
- int ret = 0;
-
- IRDA_ASSERT(dev != NULL, return -1;);
-
- self = dev->priv;
-
- IRDA_ASSERT(self != NULL, return -1;);
-
- IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, dev->name, cmd);
-
- switch (cmd) {
- case SIOCSBANDWIDTH: /* Set bandwidth */
- if (!capable(CAP_NET_ADMIN))
- ret = -EPERM;
- else
- irda_task_execute(self, __irport_change_speed, NULL,
- NULL, (void *) irq->ifr_baudrate);
- break;
- case SIOCSDONGLE: /* Set dongle */
- if (!capable(CAP_NET_ADMIN)) {
- ret = -EPERM;
- break;
- }
-
- /* Locking :
- * irda_device_dongle_init() can't be locked.
- * irda_task_execute() doesn't need to be locked.
- * Jean II
- */
-
- /* Initialize dongle */
- dongle = irda_device_dongle_init(dev, irq->ifr_dongle);
- if (!dongle)
- break;
-
- dongle->set_mode = NULL;
- dongle->read = NULL;
- dongle->write = irport_raw_write;
- dongle->set_dtr_rts = irport_set_dtr_rts;
-
- /* Now initialize the dongle! */
- dongle->issue->open(dongle, &self->qos);
-
- /* Reset dongle */
- irda_task_execute(dongle, dongle->issue->reset, NULL, NULL,
- NULL);
-
- /* Make dongle available to driver only now to avoid
- * race conditions - Jean II */
- self->dongle = dongle;
- break;
- case SIOCSMEDIABUSY: /* Set media busy */
- if (!capable(CAP_NET_ADMIN)) {
- ret = -EPERM;
- break;
- }
-
- irda_device_set_media_busy(self->netdev, TRUE);
- break;
- case SIOCGRECEIVING: /* Check if we are receiving right now */
- irq->ifr_receiving = irport_is_receiving(self);
- break;
- case SIOCSDTRRTS:
- if (!capable(CAP_NET_ADMIN)) {
- ret = -EPERM;
- break;
- }
-
- /* No real need to lock... */
- spin_lock_irqsave(&self->lock, flags);
- irport_set_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
- spin_unlock_irqrestore(&self->lock, flags);
- break;
- default:
- ret = -EOPNOTSUPP;
- }
-
- return ret;
-}
-
-static struct net_device_stats *irport_net_get_stats(struct net_device *dev)
-{
- struct irport_cb *self = (struct irport_cb *) dev->priv;
-
- return &self->stats;
-}
-
-static int __init irport_init(void)
-{
- int i;
-
- for (i=0; (io[i] < 2000) && (i < ARRAY_SIZE(dev_self)); i++) {
- if (irport_open(i, io[i], irq[i]) != NULL)
- return 0;
- }
- /*
- * Maybe something failed, but we can still be usable for FIR drivers
- */
- return 0;
-}
-
-/*
- * Function irport_cleanup ()
- *
- * Close all configured ports
- *
- */
-static void __exit irport_cleanup(void)
-{
- int i;
-
- IRDA_DEBUG( 4, "%s()\n", __FUNCTION__);
-
- for (i=0; i < ARRAY_SIZE(dev_self); i++) {
- if (dev_self[i])
- irport_close(dev_self[i]);
- }
-}
-
-module_param_array(io, int, NULL, 0);
-MODULE_PARM_DESC(io, "Base I/O addresses");
-module_param_array(irq, int, NULL, 0);
-MODULE_PARM_DESC(irq, "IRQ lines");
-
-MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
-MODULE_DESCRIPTION("Half duplex serial driver for IrDA SIR mode");
-MODULE_LICENSE("GPL");
-
-module_init(irport_init);
-module_exit(irport_cleanup);
-
projects / platform / kernel / linux-3.10.git / commitdiff