patch-2.4.20 linux-2.4.20/drivers/usb/tiglusb.c
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- Lines: 515
- Date:
Thu Nov 28 15:53:15 2002
- Orig file:
linux-2.4.19/drivers/usb/tiglusb.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -urN linux-2.4.19/drivers/usb/tiglusb.c linux-2.4.20/drivers/usb/tiglusb.c
@@ -0,0 +1,514 @@
+/* Hey EMACS -*- linux-c -*-
+ *
+ * tiglusb -- Texas Instruments' USB GraphLink (aka SilverLink) driver.
+ * Target: Texas Instruments graphing calculators (http://lpg.ticalc.org).
+ *
+ * Copyright (C) 2001-2002:
+ * Romain Lievin <roms@lpg.ticalc.org>
+ * 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: linux/Documentation/usb/SilverLink.txt
+ * and the website at: http://lpg.ticalc.org/prj_usb/
+ * for more info.
+ *
+ * History :
+ * 16/07/2002 : v1.04 -- Julien BLACHE <jb@jblache.org>
+ * + removed useless usblp_cleanup()
+ * + removed {un,}lock_kernel() as suggested on lkml
+ * + inlined clear_pipes() (used once)
+ * + inlined clear_device() (small, used twice)
+ * + removed tiglusb_find_struct() (used once, simple code)
+ * + replaced down() with down_interruptible() wherever possible
+ * + fixed double unregistering wrt devfs, causing devfs
+ * to force an oops when the device is deconnected
+ * + removed unused fields from struct tiglusb_t
+ */
+
+#include <linux/module.h>
+#include <linux/socket.h>
+#include <linux/miscdevice.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/ticable.h>
+#include "tiglusb.h"
+
+/*
+ * Version Information
+ */
+#define DRIVER_VERSION "1.04"
+#define DRIVER_AUTHOR "Romain Lievin <roms@lpg.ticalc.org> & 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 devfs_handle_t devfs_handle;
+
+/*---------- misc functions ------------------------------------------- */
+
+/*
+ * Re-initialize device
+ */
+static inline int
+clear_device (struct usb_device *dev)
+{
+ if (usb_set_configuration (dev, dev->config[0].bConfigurationValue) < 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, 1);
+ if (usb_clear_halt (dev, usb_pipeendpoint (pipe))) {
+ err ("clear_pipe (r), request failed");
+ return -1;
+ }
+
+ pipe = usb_sndbulkpipe (dev, 2);
+ if (usb_clear_halt (dev, usb_pipeendpoint (pipe))) {
+ err ("clear_pipe (w), request failed");
+ return -1;
+ }
+
+ return 0;
+}
+
+/* ----- file operations functions--------------------------------------- */
+
+static int
+tiglusb_open (struct inode *inode, struct file *filp)
+{
+ int devnum = minor (inode->i_rdev);
+ 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;
+ }
+
+ schedule_timeout (HZ / 2);
+
+ 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 0;
+}
+
+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 *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[BULK_RCV_MAX];
+ unsigned int pipe;
+
+ if (*f_pos)
+ return -ESPIPE;
+
+ if (s->remove_pending)
+ return -EIO;
+
+ if (!s->dev)
+ return -EIO;
+
+ bytes_to_read = (count >= BULK_RCV_MAX) ? BULK_RCV_MAX : 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 */
+ ret = result;
+ if (!bytes_read) {
+ dbg ("quirk !");
+ }
+ warn ("tiglusb_read, NAK received.");
+ goto out;
+ } else if (result == -EPIPE) { /* STALL -- shouldn't happen */
+ warn ("clear_halt request to remove STALL condition.");
+ if (usb_clear_halt (s->dev, usb_pipeendpoint (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:
+ return ret ? ret : bytes_read;
+}
+
+static ssize_t
+tiglusb_write (struct file *filp, const char *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[BULK_SND_MAX];
+ unsigned int pipe;
+
+ if (*f_pos)
+ return -ESPIPE;
+
+ if (s->remove_pending)
+ return -EIO;
+
+ if (!s->dev)
+ return -EIO;
+
+ bytes_to_write = (count >= BULK_SND_MAX) ? BULK_SND_MAX : 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, usb_pipeendpoint (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:
+ 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:
+ timeout = arg; // timeout value in tenth of seconds
+ break;
+ case IOCTL_TIUSB_RESET_DEVICE:
+ dbg ("IOCTL_TIGLUSB_RESET_DEVICE");
+ if (clear_device (s->dev))
+ ret = -EIO;
+ break;
+ case IOCTL_TIUSB_RESET_PIPES:
+ dbg ("IOCTL_TIGLUSB_RESET_PIPES");
+ if (clear_pipes (s->dev))
+ ret = -EIO;
+ break;
+ default:
+ ret = -ENOTTY;
+ break;
+ }
+
+ up (&s->mutex);
+
+ return ret;
+}
+
+/* ----- kernel module registering ------------------------------------ */
+
+static struct file_operations tiglusb_fops = {
+ .llseek = no_llseek,
+ .read = tiglusb_read,
+ .write = tiglusb_write,
+ .ioctl = tiglusb_ioctl,
+ .open = tiglusb_open,
+ .release = tiglusb_release,
+};
+
+/* --- initialisation code ------------------------------------- */
+
+static void *
+tiglusb_probe (struct usb_device *dev, unsigned int ifnum,
+ const struct usb_device_id *id)
+{
+ int minor = -1;
+ int i;
+ ptiglusb_t s;
+ char name[8];
+
+ dbg ("probing vendor id 0x%x, device id 0x%x ifnum:%d",
+ dev->descriptor.idVendor, dev->descriptor.idProduct, ifnum);
+
+ /*
+ * We don't handle multiple configurations. As of version 0x0103 of
+ * the TIGL hardware, there's only 1 configuration.
+ */
+
+ if (dev->descriptor.bNumConfigurations != 1)
+ return NULL;
+
+ if ((dev->descriptor.idProduct != 0xe001)
+ && (dev->descriptor.idVendor != 0x451))
+ return NULL;
+
+ if (usb_set_configuration (dev, dev->config[0].bConfigurationValue) < 0) {
+ err ("tiglusb_probe: set_configuration failed");
+ return NULL;
+ }
+
+ /*
+ * Find a tiglusb struct
+ */
+ for (i = 0; i < MAXTIGL; i++) {
+ ptiglusb_t s = &tiglusb[i];
+ if (!s->dev) {
+ minor = i;
+ break;
+ }
+ }
+
+ if (minor == -1)
+ return NULL;
+
+ s = &tiglusb[minor];
+
+ down (&s->mutex);
+ s->remove_pending = 0;
+ s->dev = dev;
+ up (&s->mutex);
+ dbg ("bound to interface: %d", ifnum);
+
+ sprintf (name, "%d", s->minor);
+ dbg ("registering to devfs : major = %d, minor = %d, node = %s",
+ TIUSB_MAJOR, (TIUSB_MINOR + s->minor), name);
+ s->devfs =
+ devfs_register (devfs_handle, name, DEVFS_FL_DEFAULT, TIUSB_MAJOR,
+ TIUSB_MINOR + s->minor, S_IFCHR | S_IRUGO | S_IWUGO,
+ &tiglusb_fops, NULL);
+
+ /* Display firmware version */
+ info ("link cable version %i.%02x",
+ dev->descriptor.bcdDevice >> 8,
+ dev->descriptor.bcdDevice & 0xff);
+
+ return s;
+}
+
+static void
+tiglusb_disconnect (struct usb_device *dev, void *drv_context)
+{
+ ptiglusb_t s = (ptiglusb_t) drv_context;
+
+ if (!s || !s->dev)
+ info ("bogus disconnect");
+
+ s->remove_pending = 1;
+ wake_up (&s->wait);
+ if (s->state == _started)
+ sleep_on (&s->remove_ok);
+ down (&s->mutex);
+ s->dev = NULL;
+ s->opened = 0;
+
+ devfs_unregister (s->devfs);
+ s->devfs = NULL;
+
+ 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 = {
+ .name = "tiglusb",
+ .probe = tiglusb_probe,
+ .disconnect = tiglusb_disconnect,
+ .id_table = tiglusb_ids,
+};
+
+/* --- initialisation code ------------------------------------- */
+
+#ifndef MODULE
+/*
+ * You can use 'tiusb=timeout'
+ */
+static int __init
+tiglusb_setup (char *str)
+{
+ int ints[2];
+
+ str = get_options (str, ARRAY_SIZE (ints), ints);
+
+ if (ints[0] > 0) {
+ timeout = ints[1];
+ }
+
+ return 1;
+}
+#endif
+
+static int __init
+tiglusb_init (void)
+{
+ unsigned u;
+ int result;
+
+ /* 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 (devfs_register_chrdev (TIUSB_MAJOR, "tiglusb", &tiglusb_fops)) {
+ err ("unable to get major %d", TIUSB_MAJOR);
+ return -EIO;
+ }
+
+ /* Use devfs, tree: /dev/ticables/usb/[0..3] */
+ devfs_handle = devfs_mk_dir (NULL, "ticables/usb", NULL);
+
+ /* register USB module */
+ result = usb_register (&tiglusb_driver);
+ if (result < 0) {
+ devfs_unregister_chrdev (TIUSB_MAJOR, "tiglusb");
+ return -1;
+ }
+
+ info (DRIVER_DESC ", " DRIVER_VERSION);
+
+ return 0;
+}
+
+static void __exit
+tiglusb_cleanup (void)
+{
+ usb_deregister (&tiglusb_driver);
+ devfs_unregister (devfs_handle);
+ devfs_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_PARM (timeout, "i");
+MODULE_PARM_DESC (timeout, "Timeout (default=1.5 seconds)");
+
+/* --------------------------------------------------------------------- */
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