/* Hey EMACS -*- linux-c -*-
*
* tiglusb -- Texas Instruments' USB GraphLink (aka SilverLink) driver.
* Target: Texas Instruments graphing calculators (http://lpg.ticalc.org).
*
* Copyright (C) 2001-2004:
* Romain Lievin <roms@tilp.info>
* Julien BLACHE <jb@technologeek.org>
* under the terms of the GNU General Public License.
*
* Based on dabusb.c, printer.c & scanner.c
*
* Please see the file: Documentation/usb/silverlink.txt
* and the website at: http://lpg.ticalc.org/prj_usb/
* for more info.
*
* History:
* 1.0x, Romain & Julien: initial submit.
* 1.03, Greg Kroah: modifications.
* 1.04, Julien: clean-up & fixes; Romain: 2.4 backport.
* 1.05, Randy Dunlap: bug fix with the timeout parameter (divide-by-zero).
* 1.06, Romain: synched with 2.5, version/firmware changed (confusing).
* 1.07, Romain: fixed bad use of usb_clear_halt (invalid argument);
* timeout argument checked in ioctl + clean-up.
* 1.08, Romain: added support of USB port embedded on some TI's handhelds.
*/
#include <linux/module.h>
#include <linux/socket.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <linux/delay.h>
#include <linux/usb.h>
#include <linux/smp_lock.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/device.h>
#include <linux/ticable.h>
#include "tiglusb.h"
/*
* Version Information
*/
#define DRIVER_VERSION "1.08"
#define DRIVER_AUTHOR "Romain Lievin <roms@tilp.info> & Julien Blache <jb@jblache.org>"
#define DRIVER_DESC "TI-GRAPH LINK USB (aka SilverLink) driver"
#define DRIVER_LICENSE "GPL"
/* ----- global variables --------------------------------------------- */
static tiglusb_t tiglusb[MAXTIGL];
static int timeout = TIMAXTIME; /* timeout in tenth of seconds */
static struct class_simple *tiglusb_class;
/*---------- misc functions ------------------------------------------- */
/*
* Re-initialize device
*/
static inline int
clear_device (struct usb_device *dev)
{
if (usb_reset_configuration (dev) < 0) {
err ("clear_device failed");
return -1;
}
return 0;
}
/*
* Clear input & output pipes (endpoints)
*/
static inline int
clear_pipes (struct usb_device *dev)
{
unsigned int pipe;
pipe = usb_sndbulkpipe (dev, 2);
if (usb_clear_halt (dev, pipe)) {
err ("clear_pipe (w), request failed");
return -1;
}
pipe = usb_rcvbulkpipe (dev, 1);
if (usb_clear_halt (dev, pipe)) {
err ("clear_pipe (r), request failed");
return -1;
}
return 0;
}
/* ----- file operations functions--------------------------------------- */
static int
tiglusb_open (struct inode *inode, struct file *filp)
{
int devnum = iminor(inode);
ptiglusb_t s;
if (devnum < TIUSB_MINOR || devnum >= (TIUSB_MINOR + MAXTIGL))
return -EIO;
s = &tiglusb[devnum - TIUSB_MINOR];
if (down_interruptible (&s->mutex)) {
return -ERESTARTSYS;
}
while (!s->dev || s->opened) {
up (&s->mutex);
if (filp->f_flags & O_NONBLOCK) {
return -EBUSY;
}
msleep_interruptible(500);
if (signal_pending (current)) {
return -EAGAIN;
}
if (down_interruptible (&s->mutex)) {
return -ERESTARTSYS;
}
}
s->opened = 1;
up (&s->mutex);
filp->f_pos = 0;
filp->private_data = s;
return nonseekable_open(inode, filp);
}
static int
tiglusb_release (struct inode *inode, struct file *filp)
{
ptiglusb_t s = (ptiglusb_t) filp->private_data;
if (down_interruptible (&s->mutex)) {
return -ERESTARTSYS;
}
s->state = _stopped;
up (&s->mutex);
if (!s->remove_pending)
clear_device (s->dev);
else
wake_up (&s->remove_ok);
s->opened = 0;
return 0;
}
static ssize_t
tiglusb_read (struct file *filp, char __user *buf, size_t count, loff_t * f_pos)
{
ptiglusb_t s = (ptiglusb_t) filp->private_data;
ssize_t ret = 0;
int bytes_to_read = 0;
int bytes_read = 0;
int result = 0;
char *buffer;
unsigned int pipe;
if (*f_pos)
return -ESPIPE;
if (s->remove_pending)
return -EIO;
if (!s->dev)
return -EIO;
buffer = kmalloc (s->max_ps, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
bytes_to_read = (count >= s->max_ps) ? s->max_ps : count;
pipe = usb_rcvbulkpipe (s->dev, 1);
result = usb_bulk_msg (s->dev, pipe, buffer, bytes_to_read,
&bytes_read, (HZ * timeout) / 10);
if (result == -ETIMEDOUT) { /* NAK */
if (!bytes_read)
dbg ("quirk !");
warn ("tiglusb_read, NAK received.");
ret = result;
goto out;
} else if (result == -EPIPE) { /* STALL -- shouldn't happen */
warn ("clear_halt request to remove STALL condition.");
if (usb_clear_halt (s->dev, pipe))
err ("clear_halt, request failed");
clear_device (s->dev);
ret = result;
goto out;
} else if (result < 0) { /* We should not get any I/O errors */
err ("funky result: %d. Please notify maintainer.", result);
ret = -EIO;
goto out;
}
if (copy_to_user (buf, buffer, bytes_read)) {
ret = -EFAULT;
}
out:
kfree(buffer);
return ret ? ret : bytes_read;
}
static ssize_t
tiglusb_write (struct file *filp, const char __user *buf, size_t count, loff_t * f_pos)
{
ptiglusb_t s = (ptiglusb_t) filp->private_data;
ssize_t ret = 0;
int bytes_to_write = 0;
int bytes_written = 0;
int result = 0;
char *buffer;
unsigned int pipe;
if (*f_pos)
return -ESPIPE;
if (s->remove_pending)
return -EIO;
if (!s->dev)
return -EIO;
buffer = kmalloc (s->max_ps, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
bytes_to_write = (count >= s->max_ps) ? s->max_ps : count;
if (copy_from_user (buffer, buf, bytes_to_write)) {
ret = -EFAULT;
goto out;
}
pipe = usb_sndbulkpipe (s->dev, 2);
result = usb_bulk_msg (s->dev, pipe, buffer, bytes_to_write,
&bytes_written, (HZ * timeout) / 10);
if (result == -ETIMEDOUT) { /* NAK */
warn ("tiglusb_write, NAK received.");
ret = result;
goto out;
} else if (result == -EPIPE) { /* STALL -- shouldn't happen */
warn ("clear_halt request to remove STALL condition.");
if (usb_clear_halt (s->dev, pipe))
err ("clear_halt, request failed");
clear_device (s->dev);
ret = result;
goto out;
} else if (result < 0) { /* We should not get any I/O errors */
warn ("funky result: %d. Please notify maintainer.", result);
ret = -EIO;
goto out;
}
if (bytes_written != bytes_to_write) {
ret = -EIO;
}
out:
kfree(buffer);
return ret ? ret : bytes_written;
}
static int
tiglusb_ioctl (struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
{
ptiglusb_t s = (ptiglusb_t) filp->private_data;
int ret = 0;
if (s->remove_pending)
return -EIO;
if (down_interruptible (&s->mutex)) {
return -ERESTARTSYS;
}
if (!s->dev) {
up (&s->mutex);
return -EIO;
}
switch (cmd) {
case IOCTL_TIUSB_TIMEOUT:
if (arg > 0)
timeout = arg;
else
ret = -EINVAL;
break;
case IOCTL_TIUSB_RESET_DEVICE:
if (clear_device (s->dev))
ret = -EIO;
break;
case IOCTL_TIUSB_RESET_PIPES:
if (clear_pipes (s->dev))
ret = -EIO;
break;
case IOCTL_TIUSB_GET_MAXPS:
if (copy_to_user((int __user *) arg, &s->max_ps, sizeof(int)))
return -EFAULT;
break;
case IOCTL_TIUSB_GET_DEVID:
if (copy_to_user((int __user *) arg, &s->dev->descriptor.idProduct,
sizeof(int)))
return -EFAULT;
break;
default:
ret = -ENOTTY;
break;
}
up (&s->mutex);
return ret;
}
/* ----- kernel module registering ------------------------------------ */
static struct file_operations tiglusb_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.read = tiglusb_read,
.write = tiglusb_write,
.ioctl = tiglusb_ioctl,
.open = tiglusb_open,
.release = tiglusb_release,
};
/* --- initialisation code ------------------------------------- */
static int
tiglusb_probe (struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_device *dev = interface_to_usbdev(intf);
int minor = -1;
int i, err = 0;
ptiglusb_t s;
struct usb_host_config *conf;
struct usb_host_interface *ifdata = NULL;
int max_ps;
dbg ("probing vendor id 0x%x, device id 0x%x",
dev->descriptor.idVendor, dev->descriptor.idProduct);
/*
* We don't handle multiple configurations. As of version 0x0103 of
* the TIGL hardware, there's only 1 configuration.
*/
if (dev->descriptor.bNumConfigurations != 1) {
err = -ENODEV;
goto out;
}
if (dev->descriptor.idVendor != 0x451) {
err = -ENODEV;
goto out;
}
if ((dev->descriptor.idProduct != 0xe001) &&
(dev->descriptor.idProduct != 0xe004) &&
(dev->descriptor.idProduct != 0xe008)) {
err = -ENODEV;
goto out;
}
/*
* TI introduced some new handhelds with embedded USB port.
* Port advertises same config as SilverLink cable but with a
* different maximum packet size (64 rather than 32).
*/
conf = dev->actconfig;
ifdata = conf->interface[0]->cur_altsetting;
max_ps = ifdata->endpoint[0].desc.wMaxPacketSize;
info("max packet size of %d/%d bytes\n",
ifdata->endpoint[0].desc.wMaxPacketSize,
ifdata->endpoint[1].desc.wMaxPacketSize);
/*
* Find a tiglusb struct
*/
for (i = 0; i < MAXTIGL; i++) {
ptiglusb_t s = &tiglusb[i];
if (!s->dev) {
minor = i;
break;
}
}
if (minor == -1) {
err = -ENODEV;
goto out;
}
s = &tiglusb[minor];
down (&s->mutex);
s->remove_pending = 0;
s->dev = dev;
s->max_ps = max_ps;
up (&s->mutex);
dbg ("bound to interface");
class_simple_device_add(tiglusb_class, MKDEV(TIUSB_MAJOR, TIUSB_MINOR + s->minor),
NULL, "usb%d", s->minor);
err = devfs_mk_cdev(MKDEV(TIUSB_MAJOR, TIUSB_MINOR) + s->minor,
S_IFCHR | S_IRUGO | S_IWUGO,
"ticables/usb/%d", s->minor);
if (err)
goto out_class;
/* Display firmware version */
info ("firmware revision %i.%02x",
dev->descriptor.bcdDevice >> 8,
dev->descriptor.bcdDevice & 0xff);
usb_set_intfdata (intf, s);
err = 0;
goto out;
out_class:
class_simple_device_remove(MKDEV(TIUSB_MAJOR, TIUSB_MINOR + s->minor));
out:
return err;
}
static void
tiglusb_disconnect (struct usb_interface *intf)
{
wait_queue_t __wait;
ptiglusb_t s = usb_get_intfdata (intf);
init_waitqueue_entry(&__wait, current);
usb_set_intfdata (intf, NULL);
if (!s || !s->dev) {
info ("bogus disconnect");
return;
}
s->remove_pending = 1;
wake_up (&s->wait);
add_wait_queue(&s->wait, &__wait);
set_current_state(TASK_UNINTERRUPTIBLE);
if (s->state == _started)
schedule();
current->state = TASK_RUNNING;
remove_wait_queue(&s->wait, &__wait);
down (&s->mutex);
s->dev = NULL;
s->opened = 0;
class_simple_device_remove(MKDEV(TIUSB_MAJOR, TIUSB_MINOR + s->minor));
devfs_remove("ticables/usb/%d", s->minor);
info ("device %d removed", s->minor);
up (&s->mutex);
}
static struct usb_device_id tiglusb_ids[] = {
{USB_DEVICE (0x0451, 0xe001)},
{}
};
MODULE_DEVICE_TABLE (usb, tiglusb_ids);
static struct usb_driver tiglusb_driver = {
.owner = THIS_MODULE,
.name = "tiglusb",
.probe = tiglusb_probe,
.disconnect = tiglusb_disconnect,
.id_table = tiglusb_ids,
};
/* --- initialisation code ------------------------------------- */
#ifndef MODULE
/*
* You can use 'tiusb=timeout' to set timeout.
*/
static int __init
tiglusb_setup (char *str)
{
int ints[2];
str = get_options (str, ARRAY_SIZE (ints), ints);
if (ints[0] > 0) {
if (ints[1] > 0)
timeout = ints[1];
else
info ("tiglusb: wrong timeout value (0), using default value.");
}
return 1;
}
#endif
static int __init
tiglusb_init (void)
{
unsigned u;
int result, err = 0;
/* initialize struct */
for (u = 0; u < MAXTIGL; u++) {
ptiglusb_t s = &tiglusb[u];
memset (s, 0, sizeof (tiglusb_t));
init_MUTEX (&s->mutex);
s->dev = NULL;
s->minor = u;
s->opened = 0;
init_waitqueue_head (&s->wait);
init_waitqueue_head (&s->remove_ok);
}
/* register device */
if (register_chrdev (TIUSB_MAJOR, "tiglusb", &tiglusb_fops)) {
err ("unable to get major %d", TIUSB_MAJOR);
err = -EIO;
goto out;
}
/* Use devfs, tree: /dev/ticables/usb/[0..3] */
devfs_mk_dir ("ticables/usb");
tiglusb_class = class_simple_create(THIS_MODULE, "tiglusb");
if (IS_ERR(tiglusb_class)) {
err = PTR_ERR(tiglusb_class);
goto out_chrdev;
}
/* register USB module */
result = usb_register (&tiglusb_driver);
if (result < 0) {
err = -1;
goto out_chrdev;
}
info (DRIVER_DESC ", version " DRIVER_VERSION);
err = 0;
goto out;
out_chrdev:
unregister_chrdev (TIUSB_MAJOR, "tiglusb");
out:
return err;
}
static void __exit
tiglusb_cleanup (void)
{
usb_deregister (&tiglusb_driver);
class_simple_destroy(tiglusb_class);
devfs_remove("ticables/usb");
unregister_chrdev (TIUSB_MAJOR, "tiglusb");
}
/* --------------------------------------------------------------------- */
__setup ("tiusb=", tiglusb_setup);
module_init (tiglusb_init);
module_exit (tiglusb_cleanup);
MODULE_AUTHOR (DRIVER_AUTHOR);
MODULE_DESCRIPTION (DRIVER_DESC);
MODULE_LICENSE (DRIVER_LICENSE);
module_param(timeout, int, 0);
MODULE_PARM_DESC (timeout, "Timeout in tenths of seconds (default=1.5 seconds)");
/* --------------------------------------------------------------------- */
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