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This is a new driver which uses parport for handling a parallel link cable 
designed to connect a Texas Instruments graphing calculators to a
computer/workstation.
It has been tested on x86 for almost 2 years and on Alpha & Sparc too with
various calculators.

BTW, a such driver was requested on SlashDot in 1999.
I also have 2 similar drivers I will submit: one for the serial cable, the
other for the USB cable.

==============================[ cut here ]==============================
--- linux.orig/MAINTAINERS Wed Mar 13 18:30:35 2002
+++ linux/MAINTAINERS Wed Mar 13 19:07:55 2002
@@ -1502,6 +1502,13 @@
M: hch@infradead.org
S: Maintained

+TI PARALLEL LINK CABLE DRIVER
+P: Romain Lievin
+M: roms@lpg.ticalc.org
+P: Julien Blache
+M: jb@technologeek.org
+S: Maintained
+
TLAN NETWORK DRIVER
P: Torben Mathiasen
M: torben.mathiasen@compaq.com
--- linux.orig/drivers/char/tipar.c Wed Mar 13 19:19:10 2002
+++ linux/drivers/char/tipar.c Wed Mar 13 20:12:37 2002
@@ -0,0 +1,541 @@
+/* Hey EMACS -*- linux-c -*-
+ *
+ * tipar - low level driver for handling a parallel link cable
+ * designed for Texas Instruments graphing calculators.
+ *
+ * Copyright (C) 2000-2002, Romain Lievin <roms@lpg.ticalc.org>
+ * under the terms of the GNU General Public License.
+ */
+
+#define VERSION "1.11"
+
+/* 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.o tipar=15,10
+ */
+
+/* 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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/config.h>
+#include <linux/version.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <linux/ioport.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <asm/io.h>
+#include <linux/poll.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/parport.h> /* Our code depend on parport */
+
+/*
+ * TI definitions
+ */
+#include <linux/ticable.h>
+
+/*
+ * Deal with CONFIG_MODVERSIONS
+ */
+#if 0 /* Pb with MODVERSIONS */
+#if CONFIG_MODVERSIONS==1
+#define MODVERSIONS
+#include <linux/modversions.h>
+#endif
+#endif
+
+/* ----- global variables --------------------------------------------- */
+
+struct tipar_struct {
+ struct pardevice *dev; /* Parport device entry */
+};
+
+#define PP_NO 3
+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 devfs_handle_t devfs_handle = NULL;
+static unsigned int tp_count = 0; /* tipar_count */
+
+/* --- 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) & 0x30);
+}
+
+static inline void init_ti_parallel(int minor)
+{
+ outbyte(3, minor);
+}
+
+/* ----- global defines ----------------------------------------------- */
+
+#define START(x) { max=jiffies+HZ/(timeout/10); }
+#define WAIT(x) { if(!time_before(jiffies, (x))) return -1; schedule(); }
+
+/* ----- D-bus bit-banging functions ---------------------------------- */
+
+/* D-bus protocol:
+ 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)
+{
+ int bit, i;
+ 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;
+ for(i=0; i < delay; i++) {
+ inbyte(minor);
+ }
+ schedule();
+ }
+
+ return 0;
+}
+
+/* Receive a byte on the specified port or -1 if error. */
+static int get_ti_parallel(int minor)
+{
+ int bit,i;
+ 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);
+ }
+ for(i=0; i<delay; i++) {
+ inbyte(minor);
+ }
+ schedule();
+ }
+ return (int)data;
+}
+
+/* Return non zero if both lines are at logical one */
+static int check_ti_parallel(int minor)
+{
+ return ((inbyte(minor) & 0x30) == 0x30);
+}
+
+/* Try to detect a parallel link cable on the specified port */
+static int probe_ti_parallel(int minor)
+{
+ int i, j;
+ int seq[]={ 0x00, 0x20, 0x10, 0x30 };
+ unsigned char data = 0;
+
+ for(i=3; i>=0; i--) {
+ outbyte(3, minor);
+ outbyte(i, minor);
+ for(j=0; j<delay; j++) data = inbyte(minor);
+ /*printk("Probing -> %i: 0x%02x 0x%02x\n", i, data & 0x30,
seq[i]);*/
+ if( (data & 0x30) != 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 = minor(inode->i_rdev) - TIPAR_MINOR_0;
+
+ if (minor >= PP_NO)
+ return -ENXIO;
+
+ init_ti_parallel(minor);
+
+ MOD_INC_USE_COUNT;
+
+ return 0;
+}
+
+static int tipar_close(struct inode *inode, struct file *file)
+{
+ MOD_DEC_USE_COUNT;
+
+ return 0;
+}
+
+static ssize_t tipar_write(struct file *file,
+ const char *buf, size_t count, loff_t *ppos)
+{
+ unsigned int minor = minor(file->f_dentry->d_inode->i_rdev) -
+ TIPAR_MINOR_0;
+ ssize_t n;
+
+ if (minor >= PP_NO)
+ return -ENXIO;
+
+ if (table[minor].dev == NULL)
+ return -ENXIO;
+
+ 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 *buf,
+ size_t count, loff_t *ppos)
+{
+ int b=0;
+ unsigned int minor=minor(file->f_dentry->d_inode->i_rdev) -
+ TIPAR_MINOR_0;
+ ssize_t retval = 0;
+
+ if(count == 0)
+ return 0;
+
+ if(ppos != &file->f_pos)
+ return -ESPIPE;
+
+ parport_claim_or_block(table[minor].dev);
+
+ do {
+ b = get_ti_parallel(minor);
+ if(b == -1) {
+ init_ti_parallel(minor);
+ retval = -ETIMEDOUT;
+ goto out;
+ }
+ else
+ break;
+
+ /* 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;
+ }
+
+ schedule();
+ } while (1);
+
+ retval = put_user(b, (unsigned char *)buf);
+ if(!retval)
+ retval = 1;
+ else
+ retval = -EFAULT;
+
+ out:
+ parport_release(table[minor].dev);
+ return retval;
+}
+
+static unsigned int tipar_poll(struct file *file, poll_table * wait)
+{
+ unsigned int mask=0;
+ return mask;
+}
+
+static int tipar_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ unsigned int minor = minor(inode->i_rdev) - TIPAR_MINOR_0;
+ int retval = 0;
+
+ if (minor >= PP_NO)
+ return -ENODEV;
+
+ switch (cmd) {
+ case 0:
+ break;
+ case TIPAR_DELAY:
+ delay = arg;
+ return 0;
+ case TIPAR_TIMEOUT:
+ timeout = arg;
+ return 0;
+ case O_NONBLOCK:
+ file->f_flags |= O_NONBLOCK;
+ return 0;
+ default:
+ retval = -EINVAL;
+ break;
+ }
+
+ return retval;
+}
+
+static long long tipar_lseek(struct file * file, long long offset, int origin)
+{
+ return -ESPIPE;
+}
+
+
+/* ----- kernel module registering ------------------------------------ */
+
+static struct file_operations tipar_fops = {
+ owner: THIS_MODULE,
+ llseek: tipar_lseek,
+ read: tipar_read,
+ write: tipar_write,
+ poll: tipar_poll,
+ 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[2];
+
+ str = get_options (str, ARRAY_SIZE(ints), ints);
+
+ if (ints[0] > 0) {
+ timeout = ints[1];
+ 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)
+{
+ char name[8];
+
+ /* 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)
+ return 1;
+
+ /* Use devfs, tree: /dev/ticables/par/[0..2] */
+ sprintf(name, "%d", nr);
+ devfs_register(devfs_handle, name,
+ DEVFS_FL_AUTO_DEVNUM, TIPAR_MAJOR, nr,
+ S_IFCHR | S_IRUGO | S_IWUGO,
+ &tipar_fops, NULL);
+
+ /* Display informations */
+ printk(KERN_INFO "tipar%d: using %s (%s).\n", nr, port->name,
+ (port->irq == PARPORT_IRQ_NONE) ? "polling" :
"interrupt-driven");
+
+ if(probe_ti_parallel(nr) != -1)
+ printk("tipar%d: link cable found !\n", nr);
+ else
+ printk("tipar%d: link cable not found (do not plug cable to
calc).\n", nr);
+
+ return 0;
+}
+
+static void tipar_attach (struct parport *port)
+{
+ if (tp_count == PP_NO) {
+ printk("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)
+{
+ /* Will be written at some point in the future */
+}
+
+static struct parport_driver tipar_driver = {
+ "tipar",
+ tipar_attach,
+ tipar_detach,
+ NULL
+};
+
+int tipar_init(void)
+{
+ unsigned int i;
+
+ /* Initialize structure */
+ for (i = 0; i < PP_NO; i++) {
+ table[i].dev = NULL;
+ }
+
+ /* Register parport device */
+ if (devfs_register_chrdev (TIPAR_MAJOR, "tipar", &tipar_fops)) {
+ printk("tipar: unable to get major %d\n", TIPAR_MAJOR);
+ return -EIO;
+ }
+
+ /* Use devfs with tree: /dev/ticables/par/[0..2] */
+ devfs_handle = devfs_mk_dir (NULL, "ticables/par", NULL);
+
+ if (parport_register_driver (&tipar_driver)) {
+ printk ("tipar: unable to register with parport\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+int __init tipar_init_module(void)
+{
+ printk("tipar: parallel link cable driver, version %s\n", VERSION);
+ return tipar_init();
+}
+
+void __exit tipar_cleanup_module(void)
+{
+ unsigned int offset;
+
+ /* Unregistering module */
+ parport_unregister_driver (&tipar_driver);
+
+ devfs_unregister (devfs_handle);
+ devfs_unregister_chrdev(TIPAR_MAJOR, "tipar");
+
+ for (offset = 0; offset < PP_NO; offset++) {
+ if (table[offset].dev == NULL)
+ continue;
+ parport_unregister_device(table[offset].dev);
+ }
+}
+
+__setup("tipar=", tipar_setup);
+module_init(tipar_init_module);
+module_exit(tipar_cleanup_module);
+
+MODULE_AUTHOR("Author/Maintainer: Romain Lievin <roms@lpg.ticalc.org>");
+MODULE_DESCRIPTION("Device driver for TI/PC parallel link cables");
+MODULE_LICENSE("GPL");
+
+EXPORT_NO_SYMBOLS;
+
+MODULE_PARM(timeout, "i");
+MODULE_PARM_DESC(timeout, "Timeout, default=1.5 seconds");
+MODULE_PARM(delay, "i");
+MODULE_PARM_DESC(delay, "Inter-bit delay, default=10 microseconds");
--- linux.orig/include/linux/ticable.h Wed Mar 13 19:42:30 2002
+++ linux/include/linux/ticable.h Wed Mar 13 19:09:57 2002
@@ -0,0 +1,41 @@
+/* Hey EMACS -*- linux-c -*-
+ *
+ * tipar/tiser/tiglusb - low level driver for handling link cables
+ * designed for Texas Instruments graphing calculators.
+ *
+ * Copyright (C) 2000-2002, Romain Lievin <roms@lpg.ticalc.org>
+ * under the terms of the GNU General Public License.
+ */
+
+#ifndef TICABLE_H
+#define TICABLE_H 1
+
+/* Internal default constants for the kernel module */
+#define TIMAXTIME 10 /* 1 seconds */
+#define IO_DELAY 10 /* 10 micro-seconds */
+
+/* Major & minor number for character devices */
+#define TIPAR_MAJOR 61
+#define TIPAR_MINOR_0 1
+#define TIPAR_MINOR_1 2
+#define TIPAR_MINOR_2 3
+
+#define TISER_MAJOR 62
+#define TISER_MINOR_0 1
+#define TISER_MINOR_1 2
+#define TISER_MINOR_2 3
+#define TISER_MINOR_3 4
+
+/*
+ * Request values for the 'ioctl' function.
+ * Simply pass the appropriate value as arg of the ioctl call.
+ * These values do not conflict with other ones but they have to be
+ * allocated... (/usr/src/linux/Documentation/ioctl-number.txt).
+ */
+#define TIPAR_DELAY _IOW('p', 0xa8, int) /* set delay */
+#define TIPAR_TIMEOUT _IOW('p', 0xa9, int) /* set timeout */
+
+#define TISER_DELAY _IOW('p', 0xa0, int) /* set delay */
+#define TISER_TIMEOUT _IOW('p', 0xa1, int) /* set timeout */
+
+#endif /* TICABLE_H */
--- linux.orig/drivers/char/Config.help Fri Mar 8 03:18:28 2002
+++ linux/drivers/char/Config.help Wed Mar 13 19:08:42 2002
@@ -595,6 +595,27 @@

If unsure, say N.

+CONFIG_TI_PAR
+ If you own a Texas Instruments graphing calculator and use a
+ parallel link cable, then you might be interested in this driver.
+
+ If you enable this driver, you will be able to communicate with
+ your calculator through a set of device nodes under /dev. The
+ main advantage of this driver is that you don't have to be root
+ to use this precise link cable (depending on the permissions on
+ the device nodes, though).
+
+ This code is also available as a module ( = code which can be
+ inserted in and removed from the running kernel whenever you want).
+ The module will be called tipar.o. If you want to compile it as a
+ module, say M here and read Documentation/modules.txt.
+
+ If you don't know what a parallel link cable is or what a Texas
+ Instruments graphing calculator is, then you probably don't need this
+ driver.
+
+ If unsure, say N.
+
CONFIG_BUSMOUSE
Say Y here if your machine has a bus mouse as opposed to a serial
mouse. Most people have a regular serial MouseSystem or
--- linux.orig/drivers/char/Config.in Fri Mar 8 03:18:17 2002
+++ linux/drivers/char/Config.in Wed Mar 13 19:09:13 2002
@@ -103,6 +103,7 @@
bool ' Support for console on line printer' CONFIG_LP_CONSOLE
fi
dep_tristate 'Support for user-space parallel port device drivers'
CONFIG_PPDEV $CONFIG_PARPORT
+ dep_tristate 'Texas Instruments parallel link cable support' CONFIG_TI_PAR
$CONFIG_PARPORT
fi

source drivers/i2c/Config.in
--- linux.orig/drivers/char/Makefile Fri Mar 8 03:18:27 2002
+++ linux/drivers/char/Makefile Wed Mar 13 19:09:28 2002
@@ -16,7 +16,7 @@

O_TARGET := char.o

-obj-y += mem.o tty_io.o n_tty.o tty_ioctl.o raw.o pty.o misc.o random.o
+obj-y += mem.o tty_io.o n_tty.o tty_ioctl.o raw.o pty.o misc.o random.o
tipar.o

# All of the (potential) objects that export symbols.
# This list comes from 'grep -l EXPORT_SYMBOL *.[hc]'.
Romain.

---
Romain Liévin (aka roms)
http://lpg.ticalc.org/prj_tilp, prj_usb, prj_tidev, prj_gtktiemu
mail: roms@lpg.ticalc.org
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