+++ /dev/null
-
- Parallel link cable for Texas Instruments handhelds
- ===================================================
-
-
-Author: Romain Lievin
-Homepage: http://lpg.ticalc.org/prj_tidev/index.html
-
-
-INTRODUCTION:
-
-This is a driver for the very common home-made parallel link cable, a cable
-designed for connecting TI8x/9x graphing calculators (handhelds) to a computer
-or workstation (Alpha, Sparc). Given that driver is built on parport, the
-parallel port abstraction layer, this driver is architecture-independent.
-
-It can also be used with another device plugged on the same port (such as a
-ZIP drive). I have a 100MB ZIP and both of them work fine!
-
-If you need more information, please visit the 'TI drivers' homepage at the URL
-above.
-
-WHAT YOU NEED:
-
-A TI calculator and a program capable of communicating with your calculator.
-
-TiLP will work for sure (since I am its developer!). yal92 may be able to use
-it by changing tidev for tipar (may require some hacking...).
-
-HOW TO USE IT:
-
-You must have first compiled parport support (CONFIG_PARPORT_DEV): either
-compiled in your kernel, either as a module.
-
-Next, (as root):
-
- modprobe parport
- modprobe tipar
-
-If it is not already there (it usually is), create the device:
-
- mknod /dev/tipar0 c 115 0
- mknod /dev/tipar1 c 115 1
- mknod /dev/tipar2 c 115 2
-
-You will have to set permissions on this device to allow you to read/write
-from it:
-
- chmod 666 /dev/tipar[0..2]
-
-Now you are ready to run a linking program such as TiLP. Be sure to configure
-it properly (RTFM).
-
-MODULE PARAMETERS:
-
- You can set these with: modprobe tipar NAME=VALUE
- There is currently no way to set these on a per-cable basis.
-
- NAME: timeout
- TYPE: integer
- DEFAULT: 15
- DESC: Timeout value in tenth of seconds. If no data is available once this
- time has expired then the driver will return with a timeout error.
-
- NAME: delay
- TYPE: integer
- DEFAULT: 10
- DESC: Inter-bit delay in micro-seconds. A lower value gives an higher data
- rate but makes transmission less reliable.
-
-These parameters can be changed at run time by any program via ioctl(2) calls
-as listed in ./include/linux/ticable.h.
-
-Rather than write 50 pages describing the ioctl() and so on, it is
-perhaps more useful you look at ticables library (dev_link.c) that demonstrates
-how to use them, and demonstrates the features of the driver. This is
-probably a lot more useful to people interested in writing applications
-that will be using this driver.
-
-QUIRKS/BUGS:
-
-None.
-
-HOW TO CONTACT US:
-
-You can email me at roms@lpg.ticalc.org. Please prefix the subject line
-with "TIPAR: " so that I am certain to notice your message.
-You can also mail JB at jb@jblache.org. He packaged these drivers for Debian.
-
-CREDITS:
-
-The code is based on tidev.c & parport.c.
-The driver has been developed independently of Texas Instruments.
+++ /dev/null
-/* Hey EMACS -*- linux-c -*-
- *
- * tipar - low level driver for handling a parallel link cable designed
- * for Texas Instruments graphing calculators (http://lpg.ticalc.org).
- * A part of the TiLP project.
- *
- * Copyright (C) 2000-2002, Romain Lievin <roms@lpg.ticalc.org>
- * under the terms of the GNU General Public License.
- *
- * Various fixes & clean-up from the Linux Kernel Mailing List
- * (Alan Cox, Richard B. Johnson, Christoph Hellwig).
- */
-
-/* This driver should, in theory, work with any parallel port that has an
- * appropriate low-level driver; all I/O is done through the parport
- * abstraction layer.
- *
- * If this driver is built into the kernel, you can configure it using the
- * kernel command-line. For example:
- *
- * tipar=timeout,delay (set timeout and delay)
- *
- * If the driver is loaded as a module, similar functionality is available
- * using module parameters. The equivalent of the above commands would be:
- *
- * # insmod tipar timeout=15 delay=10
- */
-
-/* COMPATIBILITY WITH OLD KERNELS
- *
- * Usually, parallel cables were bound to ports at
- * particular I/O addresses, as follows:
- *
- * tipar0 0x378
- * tipar1 0x278
- * tipar2 0x3bc
- *
- *
- * This driver, by default, binds tipar devices according to parport and
- * the minor number.
- *
- */
-#undef DEBUG /* change to #define to get debugging
- * output - for pr_debug() */
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/delay.h>
-#include <linux/fcntl.h>
-#include <linux/fs.h>
-#include <linux/init.h>
-#include <asm/uaccess.h>
-#include <linux/ioport.h>
-#include <asm/io.h>
-#include <linux/bitops.h>
-#include <linux/parport.h> /* Our code depend on parport */
-#include <linux/device.h>
-
-/*
- * TI definitions
- */
-#include <linux/ticable.h>
-
-/*
- * Version Information
- */
-#define DRIVER_VERSION "1.19"
-#define DRIVER_AUTHOR "Romain Lievin <roms@lpg.ticalc.org>"
-#define DRIVER_DESC "Device driver for TI/PC parallel link cables"
-#define DRIVER_LICENSE "GPL"
-
-#define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
-
-/* ----- global variables --------------------------------------------- */
-
-struct tipar_struct {
- struct pardevice *dev; /* Parport device entry */
-};
-
-#define PP_NO 3
-static struct tipar_struct table[PP_NO];
-
-static int delay = IO_DELAY; /* inter-bit delay in microseconds */
-static int timeout = TIMAXTIME; /* timeout in tenth of seconds */
-
-static unsigned int tp_count; /* tipar count */
-static unsigned long opened; /* opened devices */
-
-static struct class *tipar_class;
-
-/* --- macros for parport access -------------------------------------- */
-
-#define r_dtr(x) (parport_read_data(table[(x)].dev->port))
-#define r_str(x) (parport_read_status(table[(x)].dev->port))
-#define w_ctr(x,y) (parport_write_control(table[(x)].dev->port, (y)))
-#define w_dtr(x,y) (parport_write_data(table[(x)].dev->port, (y)))
-
-/* --- setting states on the D-bus with the right timing: ------------- */
-
-static inline void
-outbyte(int value, int minor)
-{
- w_dtr(minor, value);
-}
-
-static inline int
-inbyte(int minor)
-{
- return (r_str(minor));
-}
-
-static inline void
-init_ti_parallel(int minor)
-{
- outbyte(3, minor);
-}
-
-/* ----- global defines ----------------------------------------------- */
-
-#define START(x) { x = jiffies + (HZ * timeout) / 10; }
-#define WAIT(x) { \
- if (time_before((x), jiffies)) return -1; \
- if (need_resched()) schedule(); }
-
-/* ----- D-bus bit-banging functions ---------------------------------- */
-
-/* D-bus protocol (45kbit/s max):
- 1 0 0
- _______ ______|______ __________|________ __________
-Red : ________ | ____ | ____
- _ ____________|________ ______|__________ _____
-White: ________ | ______ | _______
-*/
-
-/* Try to transmit a byte on the specified port (-1 if error). */
-static int
-put_ti_parallel(int minor, unsigned char data)
-{
- unsigned int bit;
- unsigned long max;
-
- for (bit = 0; bit < 8; bit++) {
- if (data & 1) {
- outbyte(2, minor);
- START(max);
- do {
- WAIT(max);
- } while (inbyte(minor) & 0x10);
-
- outbyte(3, minor);
- START(max);
- do {
- WAIT(max);
- } while (!(inbyte(minor) & 0x10));
- } else {
- outbyte(1, minor);
- START(max);
- do {
- WAIT(max);
- } while (inbyte(minor) & 0x20);
-
- outbyte(3, minor);
- START(max);
- do {
- WAIT(max);
- } while (!(inbyte(minor) & 0x20));
- }
-
- data >>= 1;
- udelay(delay);
-
- if (need_resched())
- schedule();
- }
-
- return 0;
-}
-
-/* Receive a byte on the specified port or -1 if error. */
-static int
-get_ti_parallel(int minor)
-{
- unsigned int bit;
- unsigned char v, data = 0;
- unsigned long max;
-
- for (bit = 0; bit < 8; bit++) {
- START(max);
- do {
- WAIT(max);
- } while ((v = inbyte(minor) & 0x30) == 0x30);
-
- if (v == 0x10) {
- data = (data >> 1) | 0x80;
- outbyte(1, minor);
- START(max);
- do {
- WAIT(max);
- } while (!(inbyte(minor) & 0x20));
- outbyte(3, minor);
- } else {
- data = data >> 1;
- outbyte(2, minor);
- START(max);
- do {
- WAIT(max);
- } while (!(inbyte(minor) & 0x10));
- outbyte(3, minor);
- }
-
- udelay(delay);
- if (need_resched())
- schedule();
- }
-
- return (int) data;
-}
-
-/* Try to detect a parallel link cable on the specified port */
-static int
-probe_ti_parallel(int minor)
-{
- int i;
- int seq[] = { 0x00, 0x20, 0x10, 0x30 };
- int data;
-
- for (i = 3; i >= 0; i--) {
- outbyte(3, minor);
- outbyte(i, minor);
- udelay(delay);
- data = inbyte(minor) & 0x30;
- pr_debug("tipar: Probing -> %i: 0x%02x 0x%02x\n", i,
- data, seq[i]);
- if (data != seq[i]) {
- outbyte(3, minor);
- return -1;
- }
- }
-
- outbyte(3, minor);
- return 0;
-}
-
-/* ----- kernel module functions--------------------------------------- */
-
-static int
-tipar_open(struct inode *inode, struct file *file)
-{
- unsigned int minor = iminor(inode) - TIPAR_MINOR;
-
- if (tp_count == 0 || minor > tp_count - 1)
- return -ENXIO;
-
- if (test_and_set_bit(minor, &opened))
- return -EBUSY;
-
- if (!table[minor].dev) {
- printk(KERN_ERR "%s: NULL device for minor %u\n",
- __FUNCTION__, minor);
- return -ENXIO;
- }
- parport_claim_or_block(table[minor].dev);
- init_ti_parallel(minor);
- parport_release(table[minor].dev);
-
- return nonseekable_open(inode, file);
-}
-
-static int
-tipar_close(struct inode *inode, struct file *file)
-{
- unsigned int minor = iminor(inode) - TIPAR_MINOR;
-
- if (minor > tp_count - 1)
- return -ENXIO;
-
- clear_bit(minor, &opened);
-
- return 0;
-}
-
-static ssize_t
-tipar_write (struct file *file, const char __user *buf, size_t count,
- loff_t * ppos)
-{
- unsigned int minor = iminor(file->f_path.dentry->d_inode) - TIPAR_MINOR;
- ssize_t n;
-
- parport_claim_or_block(table[minor].dev);
-
- for (n = 0; n < count; n++) {
- unsigned char b;
-
- if (get_user(b, buf + n)) {
- n = -EFAULT;
- goto out;
- }
-
- if (put_ti_parallel(minor, b) == -1) {
- init_ti_parallel(minor);
- n = -ETIMEDOUT;
- goto out;
- }
- }
- out:
- parport_release(table[minor].dev);
- return n;
-}
-
-static ssize_t
-tipar_read(struct file *file, char __user *buf, size_t count, loff_t * ppos)
-{
- int b = 0;
- unsigned int minor = iminor(file->f_path.dentry->d_inode) - TIPAR_MINOR;
- ssize_t retval = 0;
- ssize_t n = 0;
-
- if (count == 0)
- return 0;
-
- parport_claim_or_block(table[minor].dev);
-
- while (n < count) {
- b = get_ti_parallel(minor);
- if (b == -1) {
- init_ti_parallel(minor);
- retval = -ETIMEDOUT;
- goto out;
- } else {
- if (put_user(b, buf + n)) {
- retval = -EFAULT;
- break;
- } else
- retval = ++n;
- }
-
- /* Non-blocking mode : try again ! */
- if (file->f_flags & O_NONBLOCK) {
- retval = -EAGAIN;
- goto out;
- }
-
- /* Signal pending, try again ! */
- if (signal_pending(current)) {
- retval = -ERESTARTSYS;
- goto out;
- }
-
- if (need_resched())
- schedule();
- }
-
- out:
- parport_release(table[minor].dev);
- return retval;
-}
-
-static int
-tipar_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- int retval = 0;
-
- switch (cmd) {
- case IOCTL_TIPAR_DELAY:
- delay = (int)arg; //get_user(delay, &arg);
- break;
- case IOCTL_TIPAR_TIMEOUT:
- if (arg != 0)
- timeout = (int)arg;
- else
- retval = -EINVAL;
- break;
- default:
- retval = -ENOTTY;
- break;
- }
-
- return retval;
-}
-
-/* ----- kernel module registering ------------------------------------ */
-
-static const struct file_operations tipar_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .read = tipar_read,
- .write = tipar_write,
- .ioctl = tipar_ioctl,
- .open = tipar_open,
- .release = tipar_close,
-};
-
-/* --- initialisation code ------------------------------------- */
-
-#ifndef MODULE
-/* You must set these - there is no sane way to probe for this cable.
- * You can use 'tipar=timeout,delay' to set these now. */
-static int __init
-tipar_setup(char *str)
-{
- int ints[3];
-
- str = get_options(str, ARRAY_SIZE(ints), ints);
-
- if (ints[0] > 0) {
- if (ints[1] != 0)
- timeout = ints[1];
- else
- printk(KERN_WARNING "tipar: bad timeout value (0), "
- "using default value instead");
- if (ints[0] > 1) {
- delay = ints[2];
- }
- }
-
- return 1;
-}
-#endif
-
-/*
- * Register our module into parport.
- * Pass also 2 callbacks functions to parport: a pre-emptive function and an
- * interrupt handler function (unused).
- * Display a message such "tipar0: using parport0 (polling)".
- */
-static int
-tipar_register(int nr, struct parport *port)
-{
- int err = 0;
-
- /* Register our module into parport */
- table[nr].dev = parport_register_device(port, "tipar",
- NULL, NULL, NULL, 0,
- (void *) &table[nr]);
-
- if (table[nr].dev == NULL) {
- err = 1;
- goto out;
- }
-
- device_create(tipar_class, port->dev, MKDEV(TIPAR_MAJOR,
- TIPAR_MINOR + nr), "par%d", nr);
-
- /* Display informations */
- pr_info("tipar%d: using %s (%s)\n", nr, port->name, (port->irq ==
- PARPORT_IRQ_NONE) ? "polling" : "interrupt-driven");
-
- if (probe_ti_parallel(nr) != -1)
- pr_info("tipar%d: link cable found\n", nr);
- else
- pr_info("tipar%d: link cable not found\n", nr);
-
- err = 0;
-
-out:
- return err;
-}
-
-static void
-tipar_attach(struct parport *port)
-{
- if (tp_count == PP_NO) {
- pr_info("tipar: ignoring parallel port (max. %d)\n", PP_NO);
- return;
- }
-
- if (!tipar_register(tp_count, port))
- tp_count++;
-}
-
-static void
-tipar_detach(struct parport *port)
-{
- /* Nothing to do */
-}
-
-static struct parport_driver tipar_driver = {
- .name = "tipar",
- .attach = tipar_attach,
- .detach = tipar_detach,
-};
-
-static int __init
-tipar_init_module(void)
-{
- int err = 0;
-
- pr_info("tipar: parallel link cable driver, version %s\n",
- DRIVER_VERSION);
-
- if (register_chrdev(TIPAR_MAJOR, "tipar", &tipar_fops)) {
- printk(KERN_ERR "tipar: unable to get major %d\n", TIPAR_MAJOR);
- err = -EIO;
- goto out;
- }
-
- tipar_class = class_create(THIS_MODULE, "ticables");
- if (IS_ERR(tipar_class)) {
- err = PTR_ERR(tipar_class);
- goto out_chrdev;
- }
- if (parport_register_driver(&tipar_driver)) {
- printk(KERN_ERR "tipar: unable to register with parport\n");
- err = -EIO;
- goto out_class;
- }
-
- err = 0;
- goto out;
-
-out_class:
- class_destroy(tipar_class);
-
-out_chrdev:
- unregister_chrdev(TIPAR_MAJOR, "tipar");
-out:
- return err;
-}
-
-static void __exit
-tipar_cleanup_module(void)
-{
- unsigned int i;
-
- /* Unregistering module */
- parport_unregister_driver(&tipar_driver);
-
- unregister_chrdev(TIPAR_MAJOR, "tipar");
-
- for (i = 0; i < PP_NO; i++) {
- if (table[i].dev == NULL)
- continue;
- parport_unregister_device(table[i].dev);
- device_destroy(tipar_class, MKDEV(TIPAR_MAJOR, i));
- }
- class_destroy(tipar_class);
-
- pr_info("tipar: module unloaded\n");
-}
-
-/* --------------------------------------------------------------------- */
-
-__setup("tipar=", tipar_setup);
-module_init(tipar_init_module);
-module_exit(tipar_cleanup_module);
-
-MODULE_AUTHOR(DRIVER_AUTHOR);
-MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_LICENSE(DRIVER_LICENSE);
-
-module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout, "Timeout (default=1.5 seconds)");
-module_param(delay, int, 0);
-MODULE_PARM_DESC(delay, "Inter-bit delay (default=10 microseconds)");
projects / platform / upstream / kernel-adaptation-pc.git / commitdiff