Logo Search packages:      
Sourcecode: linux version File versions  Download package

devio.c

/*****************************************************************************/

/*
 *      devio.c  --  User space communication with USB devices.
 *
 *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
 *
 *      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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
 *
 *  This file implements the usbfs/x/y files, where
 *  x is the bus number and y the device number.
 *
 *  It allows user space programs/"drivers" to communicate directly
 *  with USB devices without intervening kernel driver.
 *
 *  Revision history
 *    22.12.1999   0.1   Initial release (split from proc_usb.c)
 *    04.01.2000   0.2   Turned into its own filesystem
 *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
 *                       (CAN-2005-3055)
 */

/*****************************************************************************/

#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/signal.h>
#include <linux/poll.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usbdevice_fs.h>
#include <linux/cdev.h>
#include <linux/notifier.h>
#include <linux/security.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
#include <linux/moduleparam.h>

#include "hcd.h"  /* for usbcore internals */
#include "usb.h"

#define USB_MAXBUS                  64
#define USB_DEVICE_MAX              USB_MAXBUS * 128

/* Mutual exclusion for removal, open, and release */
DEFINE_MUTEX(usbfs_mutex);

struct async {
      struct list_head asynclist;
      struct dev_state *ps;
      struct pid *pid;
      uid_t uid, euid;
      unsigned int signr;
      unsigned int ifnum;
      void __user *userbuffer;
      void __user *userurb;
      struct urb *urb;
      int status;
      u32 secid;
};

static int usbfs_snoop = 0;
module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");

#define snoop(dev, format, arg...)                    \
      do {                                      \
            if (usbfs_snoop)                    \
                  dev_info( dev , format , ## arg);   \
      } while (0)

#define USB_DEVICE_DEV        MKDEV(USB_DEVICE_MAJOR, 0)


#define     MAX_USBFS_BUFFER_SIZE   16384

static inline int connected (struct dev_state *ps)
{
      return (!list_empty(&ps->list) &&
                  ps->dev->state != USB_STATE_NOTATTACHED);
}

static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
{
      loff_t ret;

      lock_kernel();

      switch (orig) {
      case 0:
            file->f_pos = offset;
            ret = file->f_pos;
            break;
      case 1:
            file->f_pos += offset;
            ret = file->f_pos;
            break;
      case 2:
      default:
            ret = -EINVAL;
      }

      unlock_kernel();
      return ret;
}

static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
{
      struct dev_state *ps = file->private_data;
      struct usb_device *dev = ps->dev;
      ssize_t ret = 0;
      unsigned len;
      loff_t pos;
      int i;

      pos = *ppos;
      usb_lock_device(dev);
      if (!connected(ps)) {
            ret = -ENODEV;
            goto err;
      } else if (pos < 0) {
            ret = -EINVAL;
            goto err;
      }

      if (pos < sizeof(struct usb_device_descriptor)) {
            struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */

            memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
            le16_to_cpus(&temp_desc.bcdUSB);
            le16_to_cpus(&temp_desc.idVendor);
            le16_to_cpus(&temp_desc.idProduct);
            le16_to_cpus(&temp_desc.bcdDevice);

            len = sizeof(struct usb_device_descriptor) - pos;
            if (len > nbytes)
                  len = nbytes;
            if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
                  ret = -EFAULT;
                  goto err;
            }

            *ppos += len;
            buf += len;
            nbytes -= len;
            ret += len;
      }

      pos = sizeof(struct usb_device_descriptor);
      for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
            struct usb_config_descriptor *config =
                  (struct usb_config_descriptor *)dev->rawdescriptors[i];
            unsigned int length = le16_to_cpu(config->wTotalLength);

            if (*ppos < pos + length) {

                  /* The descriptor may claim to be longer than it
                   * really is.  Here is the actual allocated length. */
                  unsigned alloclen =
                        le16_to_cpu(dev->config[i].desc.wTotalLength);

                  len = length - (*ppos - pos);
                  if (len > nbytes)
                        len = nbytes;

                  /* Simply don't write (skip over) unallocated parts */
                  if (alloclen > (*ppos - pos)) {
                        alloclen -= (*ppos - pos);
                        if (copy_to_user(buf,
                            dev->rawdescriptors[i] + (*ppos - pos),
                            min(len, alloclen))) {
                              ret = -EFAULT;
                              goto err;
                        }
                  }

                  *ppos += len;
                  buf += len;
                  nbytes -= len;
                  ret += len;
            }

            pos += length;
      }

err:
      usb_unlock_device(dev);
      return ret;
}

/*
 * async list handling
 */

static struct async *alloc_async(unsigned int numisoframes)
{
        unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
        struct async *as = kzalloc(assize, GFP_KERNEL);

        if (!as)
                return NULL;
      as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
      if (!as->urb) {
            kfree(as);
            return NULL;
      }
        return as;
}

static void free_async(struct async *as)
{
      put_pid(as->pid);
      kfree(as->urb->transfer_buffer);
      kfree(as->urb->setup_packet);
      usb_free_urb(as->urb);
      kfree(as);
}

static inline void async_newpending(struct async *as)
{
        struct dev_state *ps = as->ps;
        unsigned long flags;
        
        spin_lock_irqsave(&ps->lock, flags);
        list_add_tail(&as->asynclist, &ps->async_pending);
        spin_unlock_irqrestore(&ps->lock, flags);
}

static inline void async_removepending(struct async *as)
{
        struct dev_state *ps = as->ps;
        unsigned long flags;
        
        spin_lock_irqsave(&ps->lock, flags);
        list_del_init(&as->asynclist);
        spin_unlock_irqrestore(&ps->lock, flags);
}

static inline struct async *async_getcompleted(struct dev_state *ps)
{
        unsigned long flags;
        struct async *as = NULL;

        spin_lock_irqsave(&ps->lock, flags);
        if (!list_empty(&ps->async_completed)) {
                as = list_entry(ps->async_completed.next, struct async, asynclist);
                list_del_init(&as->asynclist);
        }
        spin_unlock_irqrestore(&ps->lock, flags);
        return as;
}

static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
{
        unsigned long flags;
        struct async *as;

        spin_lock_irqsave(&ps->lock, flags);
      list_for_each_entry(as, &ps->async_pending, asynclist)
            if (as->userurb == userurb) {
                  list_del_init(&as->asynclist);
                  spin_unlock_irqrestore(&ps->lock, flags);
                  return as;
            }
        spin_unlock_irqrestore(&ps->lock, flags);
        return NULL;
}

static void snoop_urb(struct urb *urb, void __user *userurb)
{
      int j;
      unsigned char *data = urb->transfer_buffer;

      if (!usbfs_snoop)
            return;

      dev_info(&urb->dev->dev, "direction=%s\n",
                  usb_urb_dir_in(urb) ? "IN" : "OUT");
      dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
      dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
             urb->transfer_buffer_length);
      dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
      dev_info(&urb->dev->dev, "data: ");
      for (j = 0; j < urb->transfer_buffer_length; ++j)
            printk ("%02x ", data[j]);
      printk("\n");
}

static void async_completed(struct urb *urb)
{
        struct async *as = urb->context;
        struct dev_state *ps = as->ps;
      struct siginfo sinfo;

        spin_lock(&ps->lock);
        list_move_tail(&as->asynclist, &ps->async_completed);
        spin_unlock(&ps->lock);
      as->status = urb->status;
      if (as->signr) {
            sinfo.si_signo = as->signr;
            sinfo.si_errno = as->status;
            sinfo.si_code = SI_ASYNCIO;
            sinfo.si_addr = as->userurb;
            kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
                              as->euid, as->secid);
      }
      snoop(&urb->dev->dev, "urb complete\n");
      snoop_urb(urb, as->userurb);
      wake_up(&ps->wait);
}

static void destroy_async (struct dev_state *ps, struct list_head *list)
{
      struct async *as;
      unsigned long flags;

      spin_lock_irqsave(&ps->lock, flags);
      while (!list_empty(list)) {
            as = list_entry(list->next, struct async, asynclist);
            list_del_init(&as->asynclist);

            /* drop the spinlock so the completion handler can run */
            spin_unlock_irqrestore(&ps->lock, flags);
            usb_kill_urb(as->urb);
            spin_lock_irqsave(&ps->lock, flags);
      }
      spin_unlock_irqrestore(&ps->lock, flags);
      as = async_getcompleted(ps);
      while (as) {
            free_async(as);
            as = async_getcompleted(ps);
      }
}

static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
{
      struct list_head *p, *q, hitlist;
      unsigned long flags;

      INIT_LIST_HEAD(&hitlist);
      spin_lock_irqsave(&ps->lock, flags);
      list_for_each_safe(p, q, &ps->async_pending)
            if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
                  list_move_tail(p, &hitlist);
      spin_unlock_irqrestore(&ps->lock, flags);
      destroy_async(ps, &hitlist);
}

static inline void destroy_all_async(struct dev_state *ps)
{
              destroy_async(ps, &ps->async_pending);
}

/*
 * interface claims are made only at the request of user level code,
 * which can also release them (explicitly or by closing files).
 * they're also undone when devices disconnect.
 */

static int driver_probe (struct usb_interface *intf,
                   const struct usb_device_id *id)
{
      return -ENODEV;
}

static void driver_disconnect(struct usb_interface *intf)
{
      struct dev_state *ps = usb_get_intfdata (intf);
      unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;

      if (!ps)
            return;

      /* NOTE:  this relies on usbcore having canceled and completed
       * all pending I/O requests; 2.6 does that.
       */

      if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
            clear_bit(ifnum, &ps->ifclaimed);
      else
            warn("interface number %u out of range", ifnum);

      usb_set_intfdata (intf, NULL);

      /* force async requests to complete */
      destroy_async_on_interface(ps, ifnum);
}

struct usb_driver usbfs_driver = {
      .name =           "usbfs",
      .probe =    driver_probe,
      .disconnect =     driver_disconnect,
};

static int claimintf(struct dev_state *ps, unsigned int ifnum)
{
      struct usb_device *dev = ps->dev;
      struct usb_interface *intf;
      int err;

      if (ifnum >= 8*sizeof(ps->ifclaimed))
            return -EINVAL;
      /* already claimed */
      if (test_bit(ifnum, &ps->ifclaimed))
            return 0;

      intf = usb_ifnum_to_if(dev, ifnum);
      if (!intf)
            err = -ENOENT;
      else
            err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
      if (err == 0)
            set_bit(ifnum, &ps->ifclaimed);
      return err;
}

static int releaseintf(struct dev_state *ps, unsigned int ifnum)
{
      struct usb_device *dev;
      struct usb_interface *intf;
      int err;

      err = -EINVAL;
      if (ifnum >= 8*sizeof(ps->ifclaimed))
            return err;
      dev = ps->dev;
      intf = usb_ifnum_to_if(dev, ifnum);
      if (!intf)
            err = -ENOENT;
      else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
            usb_driver_release_interface(&usbfs_driver, intf);
            err = 0;
      }
      return err;
}

static int checkintf(struct dev_state *ps, unsigned int ifnum)
{
      if (ps->dev->state != USB_STATE_CONFIGURED)
            return -EHOSTUNREACH;
      if (ifnum >= 8*sizeof(ps->ifclaimed))
            return -EINVAL;
      if (test_bit(ifnum, &ps->ifclaimed))
            return 0;
      /* if not yet claimed, claim it for the driver */
      dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
             task_pid_nr(current), current->comm, ifnum);
      return claimintf(ps, ifnum);
}

static int findintfep(struct usb_device *dev, unsigned int ep)
{
      unsigned int i, j, e;
        struct usb_interface *intf;
      struct usb_host_interface *alts;
      struct usb_endpoint_descriptor *endpt;

      if (ep & ~(USB_DIR_IN|0xf))
            return -EINVAL;
      if (!dev->actconfig)
            return -ESRCH;
      for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
            intf = dev->actconfig->interface[i];
            for (j = 0; j < intf->num_altsetting; j++) {
                        alts = &intf->altsetting[j];
                  for (e = 0; e < alts->desc.bNumEndpoints; e++) {
                        endpt = &alts->endpoint[e].desc;
                        if (endpt->bEndpointAddress == ep)
                              return alts->desc.bInterfaceNumber;
                  }
            }
      }
      return -ENOENT; 
}

static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
{
      int ret = 0;

      if (ps->dev->state != USB_STATE_ADDRESS
       && ps->dev->state != USB_STATE_CONFIGURED)
            return -EHOSTUNREACH;
      if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
            return 0;

      index &= 0xff;
      switch (requesttype & USB_RECIP_MASK) {
      case USB_RECIP_ENDPOINT:
            if ((ret = findintfep(ps->dev, index)) >= 0)
                  ret = checkintf(ps, ret);
            break;

      case USB_RECIP_INTERFACE:
            ret = checkintf(ps, index);
            break;
      }
      return ret;
}

static int __match_minor(struct device *dev, void *data)
{
      int minor = *((int *)data);

      if (dev->devt == MKDEV(USB_DEVICE_MAJOR, minor))
            return 1;
      return 0;
}

static struct usb_device *usbdev_lookup_by_minor(int minor)
{
      struct device *dev;

      dev = bus_find_device(&usb_bus_type, NULL, &minor, __match_minor);
      if (!dev)
            return NULL;
      put_device(dev);
      return container_of(dev, struct usb_device, dev);
}

/*
 * file operations
 */
static int usbdev_open(struct inode *inode, struct file *file)
{
      struct usb_device *dev = NULL;
      struct dev_state *ps;
      int ret;

      /* Protect against simultaneous removal or release */
      mutex_lock(&usbfs_mutex);

      ret = -ENOMEM;
      if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
            goto out;

      ret = -ENOENT;
      /* usbdev device-node */
      if (imajor(inode) == USB_DEVICE_MAJOR)
            dev = usbdev_lookup_by_minor(iminor(inode));
#ifdef CONFIG_USB_DEVICEFS
      /* procfs file */
      if (!dev)
            dev = inode->i_private;
#endif
      if (!dev)
            goto out;
      ret = usb_autoresume_device(dev);
      if (ret)
            goto out;

      usb_get_dev(dev);
      ret = 0;
      ps->dev = dev;
      ps->file = file;
      spin_lock_init(&ps->lock);
      INIT_LIST_HEAD(&ps->list);
      INIT_LIST_HEAD(&ps->async_pending);
      INIT_LIST_HEAD(&ps->async_completed);
      init_waitqueue_head(&ps->wait);
      ps->discsignr = 0;
      ps->disc_pid = get_pid(task_pid(current));
      ps->disc_uid = current->uid;
      ps->disc_euid = current->euid;
      ps->disccontext = NULL;
      ps->ifclaimed = 0;
      security_task_getsecid(current, &ps->secid);
      smp_wmb();
      list_add_tail(&ps->list, &dev->filelist);
      file->private_data = ps;
 out:
      if (ret)
            kfree(ps);
      mutex_unlock(&usbfs_mutex);
      return ret;
}

static int usbdev_release(struct inode *inode, struct file *file)
{
      struct dev_state *ps = file->private_data;
      struct usb_device *dev = ps->dev;
      unsigned int ifnum;

      usb_lock_device(dev);

      /* Protect against simultaneous open */
      mutex_lock(&usbfs_mutex);
      list_del_init(&ps->list);
      mutex_unlock(&usbfs_mutex);

      for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
                  ifnum++) {
            if (test_bit(ifnum, &ps->ifclaimed))
                  releaseintf(ps, ifnum);
      }
      destroy_all_async(ps);
      usb_autosuspend_device(dev);
      usb_unlock_device(dev);
      usb_put_dev(dev);
      put_pid(ps->disc_pid);
      kfree(ps);
      return 0;
}

static int proc_control(struct dev_state *ps, void __user *arg)
{
      struct usb_device *dev = ps->dev;
      struct usbdevfs_ctrltransfer ctrl;
      unsigned int tmo;
      unsigned char *tbuf;
      int i, j, ret;

      if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
            return -EFAULT;
      if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
            return ret;
      if (ctrl.wLength > PAGE_SIZE)
            return -EINVAL;
      if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
            return -ENOMEM;
      tmo = ctrl.timeout;
      if (ctrl.bRequestType & 0x80) {
            if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
                  free_page((unsigned long)tbuf);
                  return -EINVAL;
            }
            snoop(&dev->dev, "control read: bRequest=%02x "
                        "bRrequestType=%02x wValue=%04x "
                        "wIndex=%04x wLength=%04x\n",
                  ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
                        ctrl.wIndex, ctrl.wLength);

            usb_unlock_device(dev);
            i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
                               ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
            usb_lock_device(dev);
            if ((i > 0) && ctrl.wLength) {
                  if (usbfs_snoop) {
                        dev_info(&dev->dev, "control read: data ");
                        for (j = 0; j < i; ++j)
                              printk("%02x ", (unsigned char)(tbuf)[j]);
                        printk("\n");
                  }
                  if (copy_to_user(ctrl.data, tbuf, i)) {
                        free_page((unsigned long)tbuf);
                        return -EFAULT;
                  }
            }
      } else {
            if (ctrl.wLength) {
                  if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
                        free_page((unsigned long)tbuf);
                        return -EFAULT;
                  }
            }
            snoop(&dev->dev, "control write: bRequest=%02x "
                        "bRrequestType=%02x wValue=%04x "
                        "wIndex=%04x wLength=%04x\n",
                  ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
                        ctrl.wIndex, ctrl.wLength);
            if (usbfs_snoop) {
                  dev_info(&dev->dev, "control write: data: ");
                  for (j = 0; j < ctrl.wLength; ++j)
                        printk("%02x ", (unsigned char)(tbuf)[j]);
                  printk("\n");
            }
            usb_unlock_device(dev);
            i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
                               ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
            usb_lock_device(dev);
      }
      free_page((unsigned long)tbuf);
      if (i<0 && i != -EPIPE) {
            dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
                     "failed cmd %s rqt %u rq %u len %u ret %d\n",
                     current->comm, ctrl.bRequestType, ctrl.bRequest,
                     ctrl.wLength, i);
      }
      return i;
}

static int proc_bulk(struct dev_state *ps, void __user *arg)
{
      struct usb_device *dev = ps->dev;
      struct usbdevfs_bulktransfer bulk;
      unsigned int tmo, len1, pipe;
      int len2;
      unsigned char *tbuf;
      int i, j, ret;

      if (copy_from_user(&bulk, arg, sizeof(bulk)))
            return -EFAULT;
      if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
            return ret;
      if ((ret = checkintf(ps, ret)))
            return ret;
      if (bulk.ep & USB_DIR_IN)
            pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
      else
            pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
      if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
            return -EINVAL;
      len1 = bulk.len;
      if (len1 > MAX_USBFS_BUFFER_SIZE)
            return -EINVAL;
      if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
            return -ENOMEM;
      tmo = bulk.timeout;
      if (bulk.ep & 0x80) {
            if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
                  kfree(tbuf);
                  return -EINVAL;
            }
            snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
                  bulk.len, bulk.timeout);
            usb_unlock_device(dev);
            i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
            usb_lock_device(dev);
            if (!i && len2) {
                  if (usbfs_snoop) {
                        dev_info(&dev->dev, "bulk read: data ");
                        for (j = 0; j < len2; ++j)
                              printk("%02x ", (unsigned char)(tbuf)[j]);
                        printk("\n");
                  }
                  if (copy_to_user(bulk.data, tbuf, len2)) {
                        kfree(tbuf);
                        return -EFAULT;
                  }
            }
      } else {
            if (len1) {
                  if (copy_from_user(tbuf, bulk.data, len1)) {
                        kfree(tbuf);
                        return -EFAULT;
                  }
            }
            snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
                  bulk.len, bulk.timeout);
            if (usbfs_snoop) {
                  dev_info(&dev->dev, "bulk write: data: ");
                  for (j = 0; j < len1; ++j)
                        printk("%02x ", (unsigned char)(tbuf)[j]);
                  printk("\n");
            }
            usb_unlock_device(dev);
            i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
            usb_lock_device(dev);
      }
      kfree(tbuf);
      if (i < 0)
            return i;
      return len2;
}

static int proc_resetep(struct dev_state *ps, void __user *arg)
{
      unsigned int ep;
      int ret;

      if (get_user(ep, (unsigned int __user *)arg))
            return -EFAULT;
      if ((ret = findintfep(ps->dev, ep)) < 0)
            return ret;
      if ((ret = checkintf(ps, ret)))
            return ret;
      usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
      return 0;
}

static int proc_clearhalt(struct dev_state *ps, void __user *arg)
{
      unsigned int ep;
      int pipe;
      int ret;

      if (get_user(ep, (unsigned int __user *)arg))
            return -EFAULT;
      if ((ret = findintfep(ps->dev, ep)) < 0)
            return ret;
      if ((ret = checkintf(ps, ret)))
            return ret;
      if (ep & USB_DIR_IN)
                pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
        else
                pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);

      return usb_clear_halt(ps->dev, pipe);
}
            

static int proc_getdriver(struct dev_state *ps, void __user *arg)
{
      struct usbdevfs_getdriver gd;
      struct usb_interface *intf;
      int ret;

      if (copy_from_user(&gd, arg, sizeof(gd)))
            return -EFAULT;
      intf = usb_ifnum_to_if(ps->dev, gd.interface);
      if (!intf || !intf->dev.driver)
            ret = -ENODATA;
      else {
            strncpy(gd.driver, intf->dev.driver->name,
                        sizeof(gd.driver));
            ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
      }
      return ret;
}

static int proc_connectinfo(struct dev_state *ps, void __user *arg)
{
      struct usbdevfs_connectinfo ci;

      ci.devnum = ps->dev->devnum;
      ci.slow = ps->dev->speed == USB_SPEED_LOW;
      if (copy_to_user(arg, &ci, sizeof(ci)))
            return -EFAULT;
      return 0;
}

static int proc_resetdevice(struct dev_state *ps)
{
      return usb_reset_composite_device(ps->dev, NULL);
}

static int proc_setintf(struct dev_state *ps, void __user *arg)
{
      struct usbdevfs_setinterface setintf;
      int ret;

      if (copy_from_user(&setintf, arg, sizeof(setintf)))
            return -EFAULT;
      if ((ret = checkintf(ps, setintf.interface)))
            return ret;
      return usb_set_interface(ps->dev, setintf.interface,
                  setintf.altsetting);
}

static int proc_setconfig(struct dev_state *ps, void __user *arg)
{
      int u;
      int status = 0;
      struct usb_host_config *actconfig;

      if (get_user(u, (int __user *)arg))
            return -EFAULT;

      actconfig = ps->dev->actconfig;
 
      /* Don't touch the device if any interfaces are claimed.
       * It could interfere with other drivers' operations, and if
       * an interface is claimed by usbfs it could easily deadlock.
       */
      if (actconfig) {
            int i;
 
            for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
                  if (usb_interface_claimed(actconfig->interface[i])) {
                        dev_warn (&ps->dev->dev,
                              "usbfs: interface %d claimed by %s "
                              "while '%s' sets config #%d\n",
                              actconfig->interface[i]
                                    ->cur_altsetting
                                    ->desc.bInterfaceNumber,
                              actconfig->interface[i]
                                    ->dev.driver->name,
                              current->comm, u);
                        status = -EBUSY;
                        break;
                  }
            }
      }

      /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
       * so avoid usb_set_configuration()'s kick to sysfs
       */
      if (status == 0) {
            if (actconfig && actconfig->desc.bConfigurationValue == u)
                  status = usb_reset_configuration(ps->dev);
            else
                  status = usb_set_configuration(ps->dev, u);
      }

      return status;
}

static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
                       struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
                       void __user *arg)
{
      struct usbdevfs_iso_packet_desc *isopkt = NULL;
      struct usb_host_endpoint *ep;
      struct async *as;
      struct usb_ctrlrequest *dr = NULL;
      unsigned int u, totlen, isofrmlen;
      int ret, ifnum = -1;
      int is_in;

      if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
                     URB_NO_FSBR|URB_ZERO_PACKET))
            return -EINVAL;
      if (!uurb->buffer)
            return -EINVAL;
      if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
            return -EINVAL;
      if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
            if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
                  return ifnum;
            if ((ret = checkintf(ps, ifnum)))
                  return ret;
      }
      if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
            is_in = 1;
            ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
      } else {
            is_in = 0;
            ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
      }
      if (!ep)
            return -ENOENT;
      switch(uurb->type) {
      case USBDEVFS_URB_TYPE_CONTROL:
            if (!usb_endpoint_xfer_control(&ep->desc))
                  return -EINVAL;
            /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
            if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
                  return -EINVAL;
            if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
                  return -ENOMEM;
            if (copy_from_user(dr, uurb->buffer, 8)) {
                  kfree(dr);
                  return -EFAULT;
            }
            if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
                  kfree(dr);
                  return -EINVAL;
            }
            if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
                  kfree(dr);
                  return ret;
            }
            uurb->number_of_packets = 0;
            uurb->buffer_length = le16_to_cpup(&dr->wLength);
            uurb->buffer += 8;
            if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
                  is_in = 1;
                  uurb->endpoint |= USB_DIR_IN;
            } else {
                  is_in = 0;
                  uurb->endpoint &= ~USB_DIR_IN;
            }
            if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
                        uurb->buffer, uurb->buffer_length)) {
                  kfree(dr);
                  return -EFAULT;
            }
            snoop(&ps->dev->dev, "control urb: bRequest=%02x "
                  "bRrequestType=%02x wValue=%04x "
                  "wIndex=%04x wLength=%04x\n",
                  dr->bRequest, dr->bRequestType,
                  __le16_to_cpup(&dr->wValue),
                  __le16_to_cpup(&dr->wIndex),
                  __le16_to_cpup(&dr->wLength));
            break;

      case USBDEVFS_URB_TYPE_BULK:
            switch (usb_endpoint_type(&ep->desc)) {
            case USB_ENDPOINT_XFER_CONTROL:
            case USB_ENDPOINT_XFER_ISOC:
                  return -EINVAL;
            /* allow single-shot interrupt transfers, at bogus rates */
            }
            uurb->number_of_packets = 0;
            if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
                  return -EINVAL;
            if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
                        uurb->buffer, uurb->buffer_length))
                  return -EFAULT;
            snoop(&ps->dev->dev, "bulk urb\n");
            break;

      case USBDEVFS_URB_TYPE_ISO:
            /* arbitrary limit */
            if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
                  return -EINVAL;
            if (!usb_endpoint_xfer_isoc(&ep->desc))
                  return -EINVAL;
            isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
            if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
                  return -ENOMEM;
            if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
                  kfree(isopkt);
                  return -EFAULT;
            }
            for (totlen = u = 0; u < uurb->number_of_packets; u++) {
                  /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
                  if (isopkt[u].length > 8192) {
                        kfree(isopkt);
                        return -EINVAL;
                  }
                  totlen += isopkt[u].length;
            }
            if (totlen > 32768) {
                  kfree(isopkt);
                  return -EINVAL;
            }
            uurb->buffer_length = totlen;
            snoop(&ps->dev->dev, "iso urb\n");
            break;

      case USBDEVFS_URB_TYPE_INTERRUPT:
            uurb->number_of_packets = 0;
            if (!usb_endpoint_xfer_int(&ep->desc))
                  return -EINVAL;
            if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
                  return -EINVAL;
            if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
                        uurb->buffer, uurb->buffer_length))
                  return -EFAULT;
            snoop(&ps->dev->dev, "interrupt urb\n");
            break;

      default:
            return -EINVAL;
      }
      if (!(as = alloc_async(uurb->number_of_packets))) {
            kfree(isopkt);
            kfree(dr);
            return -ENOMEM;
      }
      if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
            kfree(isopkt);
            kfree(dr);
            free_async(as);
            return -ENOMEM;
      }
        as->urb->dev = ps->dev;
        as->urb->pipe = (uurb->type << 30) |
                  __create_pipe(ps->dev, uurb->endpoint & 0xf) |
                  (uurb->endpoint & USB_DIR_IN);
        as->urb->transfer_flags = uurb->flags |
                  (is_in ? URB_DIR_IN : URB_DIR_OUT);
      as->urb->transfer_buffer_length = uurb->buffer_length;
      as->urb->setup_packet = (unsigned char*)dr;
      as->urb->start_frame = uurb->start_frame;
      as->urb->number_of_packets = uurb->number_of_packets;
      if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
                  ps->dev->speed == USB_SPEED_HIGH)
            as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
      else
            as->urb->interval = ep->desc.bInterval;
        as->urb->context = as;
        as->urb->complete = async_completed;
      for (totlen = u = 0; u < uurb->number_of_packets; u++) {
            as->urb->iso_frame_desc[u].offset = totlen;
            as->urb->iso_frame_desc[u].length = isopkt[u].length;
            totlen += isopkt[u].length;
      }
      kfree(isopkt);
      as->ps = ps;
        as->userurb = arg;
      if (uurb->endpoint & USB_DIR_IN)
            as->userbuffer = uurb->buffer;
      else
            as->userbuffer = NULL;
      as->signr = uurb->signr;
      as->ifnum = ifnum;
      as->pid = get_pid(task_pid(current));
      as->uid = current->uid;
      as->euid = current->euid;
      security_task_getsecid(current, &as->secid);
      if (!is_in) {
            if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
                        as->urb->transfer_buffer_length)) {
                  free_async(as);
                  return -EFAULT;
            }
      }
      snoop_urb(as->urb, as->userurb);
        async_newpending(as);
        if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
            dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
                async_removepending(as);
                free_async(as);
                return ret;
        }
        return 0;
}

static int proc_submiturb(struct dev_state *ps, void __user *arg)
{
      struct usbdevfs_urb uurb;

      if (copy_from_user(&uurb, arg, sizeof(uurb)))
            return -EFAULT;

      return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
}

static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
{
      struct async *as;

      as = async_getpending(ps, arg);
      if (!as)
            return -EINVAL;
      usb_kill_urb(as->urb);
      return 0;
}

static int processcompl(struct async *as, void __user * __user *arg)
{
      struct urb *urb = as->urb;
      struct usbdevfs_urb __user *userurb = as->userurb;
      void __user *addr = as->userurb;
      unsigned int i;

      if (as->userbuffer)
            if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
                  return -EFAULT;
      if (put_user(as->status, &userurb->status))
            return -EFAULT;
      if (put_user(urb->actual_length, &userurb->actual_length))
            return -EFAULT;
      if (put_user(urb->error_count, &userurb->error_count))
            return -EFAULT;

      if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
            for (i = 0; i < urb->number_of_packets; i++) {
                  if (put_user(urb->iso_frame_desc[i].actual_length,
                             &userurb->iso_frame_desc[i].actual_length))
                        return -EFAULT;
                  if (put_user(urb->iso_frame_desc[i].status,
                             &userurb->iso_frame_desc[i].status))
                        return -EFAULT;
            }
      }

      free_async(as);

      if (put_user(addr, (void __user * __user *)arg))
            return -EFAULT;
      return 0;
}

static struct async* reap_as(struct dev_state *ps)
{
        DECLARE_WAITQUEUE(wait, current);
      struct async *as = NULL;
      struct usb_device *dev = ps->dev;

      add_wait_queue(&ps->wait, &wait);
      for (;;) {
            __set_current_state(TASK_INTERRUPTIBLE);
            if ((as = async_getcompleted(ps)))
                  break;
            if (signal_pending(current))
                  break;
            usb_unlock_device(dev);
            schedule();
            usb_lock_device(dev);
      }
      remove_wait_queue(&ps->wait, &wait);
      set_current_state(TASK_RUNNING);
      return as;
}

static int proc_reapurb(struct dev_state *ps, void __user *arg)
{
      struct async *as = reap_as(ps);
      if (as)
            return processcompl(as, (void __user * __user *)arg);
      if (signal_pending(current))
            return -EINTR;
      return -EIO;
}

static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
{
      struct async *as;

      if (!(as = async_getcompleted(ps)))
            return -EAGAIN;
      return processcompl(as, (void __user * __user *)arg);
}

#ifdef CONFIG_COMPAT

static int get_urb32(struct usbdevfs_urb *kurb,
                 struct usbdevfs_urb32 __user *uurb)
{
      __u32  uptr;
      if (get_user(kurb->type, &uurb->type) ||
          __get_user(kurb->endpoint, &uurb->endpoint) ||
          __get_user(kurb->status, &uurb->status) ||
          __get_user(kurb->flags, &uurb->flags) ||
          __get_user(kurb->buffer_length, &uurb->buffer_length) ||
          __get_user(kurb->actual_length, &uurb->actual_length) ||
          __get_user(kurb->start_frame, &uurb->start_frame) ||
          __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
          __get_user(kurb->error_count, &uurb->error_count) ||
          __get_user(kurb->signr, &uurb->signr))
            return -EFAULT;

      if (__get_user(uptr, &uurb->buffer))
            return -EFAULT;
      kurb->buffer = compat_ptr(uptr);
      if (__get_user(uptr, &uurb->buffer))
            return -EFAULT;
      kurb->usercontext = compat_ptr(uptr);

      return 0;
}

static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
{
      struct usbdevfs_urb uurb;

      if (get_urb32(&uurb,(struct usbdevfs_urb32 __user *)arg))
            return -EFAULT;

      return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
}

static int processcompl_compat(struct async *as, void __user * __user *arg)
{
      struct urb *urb = as->urb;
      struct usbdevfs_urb32 __user *userurb = as->userurb;
      void __user *addr = as->userurb;
      unsigned int i;

      if (as->userbuffer)
            if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
                  return -EFAULT;
      if (put_user(as->status, &userurb->status))
            return -EFAULT;
      if (put_user(urb->actual_length, &userurb->actual_length))
            return -EFAULT;
      if (put_user(urb->error_count, &userurb->error_count))
            return -EFAULT;

      if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
            for (i = 0; i < urb->number_of_packets; i++) {
                  if (put_user(urb->iso_frame_desc[i].actual_length,
                             &userurb->iso_frame_desc[i].actual_length))
                        return -EFAULT;
                  if (put_user(urb->iso_frame_desc[i].status,
                             &userurb->iso_frame_desc[i].status))
                        return -EFAULT;
            }
      }

      free_async(as);
      if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
            return -EFAULT;
      return 0;
}

static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
{
      struct async *as = reap_as(ps);
      if (as)
            return processcompl_compat(as, (void __user * __user *)arg);
      if (signal_pending(current))
            return -EINTR;
      return -EIO;
}

static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
{
      struct async *as;

      if (!(as = async_getcompleted(ps)))
            return -EAGAIN;
      return processcompl_compat(as, (void __user * __user *)arg);
}

#endif

static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
{
      struct usbdevfs_disconnectsignal ds;

      if (copy_from_user(&ds, arg, sizeof(ds)))
            return -EFAULT;
      if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
            return -EINVAL;
      ps->discsignr = ds.signr;
      ps->disccontext = ds.context;
      return 0;
}

static int proc_claiminterface(struct dev_state *ps, void __user *arg)
{
      unsigned int ifnum;

      if (get_user(ifnum, (unsigned int __user *)arg))
            return -EFAULT;
      return claimintf(ps, ifnum);
}

static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
{
      unsigned int ifnum;
      int ret;

      if (get_user(ifnum, (unsigned int __user *)arg))
            return -EFAULT;
      if ((ret = releaseintf(ps, ifnum)) < 0)
            return ret;
      destroy_async_on_interface (ps, ifnum);
      return 0;
}

static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
{
      int               size;
      void              *buf = NULL;
      int               retval = 0;
      struct usb_interface    *intf = NULL;
      struct usb_driver       *driver = NULL;

      /* alloc buffer */
      if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
            if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
                  return -ENOMEM;
            if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
                  if (copy_from_user (buf, ctl->data, size)) {
                        kfree(buf);
                        return -EFAULT;
                  }
            } else {
                  memset (buf, 0, size);
            }
      }

      if (!connected(ps)) {
            kfree(buf);
            return -ENODEV;
      }

      if (ps->dev->state != USB_STATE_CONFIGURED)
            retval = -EHOSTUNREACH;
      else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
               retval = -EINVAL;
      else switch (ctl->ioctl_code) {

      /* disconnect kernel driver from interface */
      case USBDEVFS_DISCONNECT:
            if (intf->dev.driver) {
                  driver = to_usb_driver(intf->dev.driver);
                  dev_dbg (&intf->dev, "disconnect by usbfs\n");
                  usb_driver_release_interface(driver, intf);
            } else
                  retval = -ENODATA;
            break;

      /* let kernel drivers try to (re)bind to the interface */
      case USBDEVFS_CONNECT:
            usb_unlock_device(ps->dev);
            retval = bus_rescan_devices(intf->dev.bus);
            usb_lock_device(ps->dev);
            break;

      /* talk directly to the interface's driver */
      default:
            if (intf->dev.driver)
                  driver = to_usb_driver(intf->dev.driver);
            if (driver == NULL || driver->ioctl == NULL) {
                  retval = -ENOTTY;
            } else {
                  retval = driver->ioctl (intf, ctl->ioctl_code, buf);
                  if (retval == -ENOIOCTLCMD)
                        retval = -ENOTTY;
            }
      }

      /* cleanup and return */
      if (retval >= 0
                  && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
                  && size > 0
                  && copy_to_user (ctl->data, buf, size) != 0)
            retval = -EFAULT;

      kfree(buf);
      return retval;
}

static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
{
      struct usbdevfs_ioctl   ctrl;

      if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
            return -EFAULT;
      return proc_ioctl(ps, &ctrl);
}

#ifdef CONFIG_COMPAT
static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
{
      struct usbdevfs_ioctl32 __user *uioc;
      struct usbdevfs_ioctl ctrl;
      u32 udata;

      uioc = compat_ptr((long)arg);
      if (get_user(ctrl.ifno, &uioc->ifno) ||
          get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
          __get_user(udata, &uioc->data))
            return -EFAULT;
      ctrl.data = compat_ptr(udata);

      return proc_ioctl(ps, &ctrl);
}
#endif

/*
 * NOTE:  All requests here that have interface numbers as parameters
 * are assuming that somehow the configuration has been prevented from
 * changing.  But there's no mechanism to ensure that...
 */
static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
      struct dev_state *ps = file->private_data;
      struct usb_device *dev = ps->dev;
      void __user *p = (void __user *)arg;
      int ret = -ENOTTY;

      if (!(file->f_mode & FMODE_WRITE))
            return -EPERM;
      usb_lock_device(dev);
      if (!connected(ps)) {
            usb_unlock_device(dev);
            return -ENODEV;
      }

      switch (cmd) {
      case USBDEVFS_CONTROL:
            snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
            ret = proc_control(ps, p);
            if (ret >= 0)
                  inode->i_mtime = CURRENT_TIME;
            break;

      case USBDEVFS_BULK:
            snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
            ret = proc_bulk(ps, p);
            if (ret >= 0)
                  inode->i_mtime = CURRENT_TIME;
            break;

      case USBDEVFS_RESETEP:
            snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
            ret = proc_resetep(ps, p);
            if (ret >= 0)
                  inode->i_mtime = CURRENT_TIME;
            break;

      case USBDEVFS_RESET:
            snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
            ret = proc_resetdevice(ps);
            break;

      case USBDEVFS_CLEAR_HALT:
            snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
            ret = proc_clearhalt(ps, p);
            if (ret >= 0)
                  inode->i_mtime = CURRENT_TIME;
            break;

      case USBDEVFS_GETDRIVER:
            snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
            ret = proc_getdriver(ps, p);
            break;

      case USBDEVFS_CONNECTINFO:
            snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
            ret = proc_connectinfo(ps, p);
            break;

      case USBDEVFS_SETINTERFACE:
            snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
            ret = proc_setintf(ps, p);
            break;

      case USBDEVFS_SETCONFIGURATION:
            snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
            ret = proc_setconfig(ps, p);
            break;

      case USBDEVFS_SUBMITURB:
            snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
            ret = proc_submiturb(ps, p);
            if (ret >= 0)
                  inode->i_mtime = CURRENT_TIME;
            break;

#ifdef CONFIG_COMPAT

      case USBDEVFS_SUBMITURB32:
            snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
            ret = proc_submiturb_compat(ps, p);
            if (ret >= 0)
                  inode->i_mtime = CURRENT_TIME;
            break;

      case USBDEVFS_REAPURB32:
            snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
            ret = proc_reapurb_compat(ps, p);
            break;

      case USBDEVFS_REAPURBNDELAY32:
            snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
            ret = proc_reapurbnonblock_compat(ps, p);
            break;

      case USBDEVFS_IOCTL32:
            snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
            ret = proc_ioctl_compat(ps, ptr_to_compat(p));
            break;
#endif

      case USBDEVFS_DISCARDURB:
            snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
            ret = proc_unlinkurb(ps, p);
            break;

      case USBDEVFS_REAPURB:
            snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
            ret = proc_reapurb(ps, p);
            break;

      case USBDEVFS_REAPURBNDELAY:
            snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
            ret = proc_reapurbnonblock(ps, p);
            break;

      case USBDEVFS_DISCSIGNAL:
            snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
            ret = proc_disconnectsignal(ps, p);
            break;

      case USBDEVFS_CLAIMINTERFACE:
            snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
            ret = proc_claiminterface(ps, p);
            break;

      case USBDEVFS_RELEASEINTERFACE:
            snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
            ret = proc_releaseinterface(ps, p);
            break;

      case USBDEVFS_IOCTL:
            snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
            ret = proc_ioctl_default(ps, p);
            break;
      }
      usb_unlock_device(dev);
      if (ret >= 0)
            inode->i_atime = CURRENT_TIME;
      return ret;
}

/* No kernel lock - fine */
static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
{
      struct dev_state *ps = file->private_data;
      unsigned int mask = 0;

      poll_wait(file, &ps->wait, wait);
      if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
            mask |= POLLOUT | POLLWRNORM;
      if (!connected(ps))
            mask |= POLLERR | POLLHUP;
      return mask;
}

const struct file_operations usbdev_file_operations = {
      .owner =    THIS_MODULE,
      .llseek =   usbdev_lseek,
      .read =           usbdev_read,
      .poll =           usbdev_poll,
      .ioctl =    usbdev_ioctl,
      .open =           usbdev_open,
      .release =  usbdev_release,
};

#ifdef CONFIG_USB_DEVICE_CLASS
static struct class *usb_classdev_class;

static int usb_classdev_add(struct usb_device *dev)
{
      int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);

      dev->usb_classdev = device_create(usb_classdev_class, &dev->dev,
                        MKDEV(USB_DEVICE_MAJOR, minor),
                        "usbdev%d.%d", dev->bus->busnum, dev->devnum);
      if (IS_ERR(dev->usb_classdev))
            return PTR_ERR(dev->usb_classdev);

      return 0;
}

static void usb_classdev_remove(struct usb_device *dev)
{
      device_unregister(dev->usb_classdev);
}

static int usb_classdev_notify(struct notifier_block *self,
                         unsigned long action, void *dev)
{
      switch (action) {
      case USB_DEVICE_ADD:
            if (usb_classdev_add(dev))
                  return NOTIFY_BAD;
            break;
      case USB_DEVICE_REMOVE:
            usb_classdev_remove(dev);
            break;
      }
      return NOTIFY_OK;
}

static struct notifier_block usbdev_nb = {
      .notifier_call =  usb_classdev_notify,
};
#endif

static struct cdev usb_device_cdev;

int __init usb_devio_init(void)
{
      int retval;

      retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
                  "usb_device");
      if (retval) {
            err("unable to register minors for usb_device");
            goto out;
      }
      cdev_init(&usb_device_cdev, &usbdev_file_operations);
      retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
      if (retval) {
            err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
            goto error_cdev;
      }
#ifdef CONFIG_USB_DEVICE_CLASS
      usb_classdev_class = class_create(THIS_MODULE, "usb_device");
      if (IS_ERR(usb_classdev_class)) {
            err("unable to register usb_device class");
            retval = PTR_ERR(usb_classdev_class);
            cdev_del(&usb_device_cdev);
            usb_classdev_class = NULL;
            goto out;
      }

      usb_register_notify(&usbdev_nb);
#endif
out:
      return retval;

error_cdev:
      unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
      goto out;
}

void usb_devio_cleanup(void)
{
#ifdef CONFIG_USB_DEVICE_CLASS
      usb_unregister_notify(&usbdev_nb);
      class_destroy(usb_classdev_class);
#endif
      cdev_del(&usb_device_cdev);
      unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
}

Generated by  Doxygen 1.6.0   Back to index