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node.c

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  • devio.c 44.50 KiB
    /*****************************************************************************/
    
    /*
     *      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.
     *
     *  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 dev_state {
    	struct list_head list;      /* state list */
    	struct usb_device *dev;
    	struct file *file;
    	spinlock_t lock;            /* protects the async urb lists */
    	struct list_head async_pending;
    	struct list_head async_completed;
    	wait_queue_head_t wait;     /* wake up if a request completed */
    	unsigned int discsignr;
    	struct pid *disc_pid;
    	uid_t disc_uid, disc_euid;
    	void __user *disccontext;
    	unsigned long ifclaimed;
    	u32 secid;
    };
    
    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;
    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)) {
    		/* 18 bytes - fits on the stack */
    		struct usb_device_descriptor temp_desc;
    
    		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)
    {
    	struct async *as;
    
    	as = kzalloc(sizeof(struct async), 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
    		dev_warn(&intf->dev, "interface number %u out of range\n",
    			 ifnum);
    
    	usb_set_intfdata(intf, NULL);
    
    	/* force async requests to complete */
    	destroy_async_on_interface(ps, ifnum);
    }
    
    /* The following routines are merely placeholders.  There is no way
     * to inform a user task about suspend or resumes.
     */
    static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
    {
    	return 0;
    }
    
    static int driver_resume(struct usb_interface *intf)
    {
    	return 0;
    }
    
    struct usb_driver usbfs_driver = {
    	.name =		"usbfs",
    	.probe =	driver_probe,
    	.disconnect =	driver_disconnect,
    	.suspend =	driver_suspend,
    	.resume =	driver_resume,
    };
    
    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:
    		ret = findintfep(ps->dev, index);
    		if (ret >= 0)
    			ret = checkintf(ps, ret);
    		break;
    
    	case USB_RECIP_INTERFACE:
    		ret = checkintf(ps, index);
    		break;
    	}
    	return ret;
    }
    
    static int match_devt(struct device *dev, void *data)
    {
    	return dev->devt == (dev_t) (unsigned long) data;
    }
    
    static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
    {
    	struct device *dev;
    
    	dev = bus_find_device(&usb_bus_type, NULL,
    			      (void *) (unsigned long) devt, match_devt);
    	if (!dev)
    		return NULL;
    	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;
    
    	lock_kernel();
    	/* Protect against simultaneous removal or release */
    	mutex_lock(&usbfs_mutex);
    
    	ret = -ENOMEM;
    	ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
    	if (!ps)
    		goto out;
    
    	ret = -ENOENT;
    
    	/* usbdev device-node */
    	if (imajor(inode) == USB_DEVICE_MAJOR)
    		dev = usbdev_lookup_by_devt(inode->i_rdev);
    #ifdef CONFIG_USB_DEVICEFS
    	/* procfs file */
    	if (!dev) {
    		dev = inode->i_private;
    		if (dev && dev->usbfs_dentry &&
    					dev->usbfs_dentry->d_inode == inode)
    			usb_get_dev(dev);
    		else
    			dev = NULL;
    	}
    #endif
    	if (!dev || dev->state == USB_STATE_NOTATTACHED)
    		goto out;
    	ret = usb_autoresume_device(dev);
    	if (ret)
    		goto out;
    
    	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;
    	snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
    			current->comm);
     out:
    	if (ret) {
    		kfree(ps);
    		usb_put_dev(dev);
    	}
    	mutex_unlock(&usbfs_mutex);
    	unlock_kernel();
    	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;
    	unsigned wLength;
    	int i, j, ret;
    
    	if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
    		return -EFAULT;
    	ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
    	if (ret)
    		return ret;
    	wLength = ctrl.wLength;		/* To suppress 64k PAGE_SIZE warning */
    	if (wLength > PAGE_SIZE)
    		return -EINVAL;
    	tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
    	if (!tbuf)
    		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 ", (u8)(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;
    	ret = findintfep(ps->dev, bulk.ep);
    	if (ret < 0)
    		return ret;
    	ret = checkintf(ps, ret);
    	if (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 ", (u8)(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;
    	ret = findintfep(ps->dev, ep);
    	if (ret < 0)
    		return ret;
    	ret = checkintf(ps, ret);
    	if (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;
    	ret = findintfep(ps->dev, ep);
    	if (ret < 0)
    		return ret;
    	ret = checkintf(ps, ret);
    	if (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_device(ps->dev);
    }
    
    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 |
    				USBDEVFS_URB_NO_FSBR |
    				USBDEVFS_URB_ZERO_PACKET |
    				USBDEVFS_URB_NO_INTERRUPT))
    		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)) {
    		ifnum = findintfep(ps->dev, uurb->endpoint);
    		if (ifnum < 0)
    			return ifnum;
    		ret = checkintf(ps, ifnum);
    		if (ret)
    			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;
    		dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
    		if (!dr)
    			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;
    		}
    		ret = check_ctrlrecip(ps, dr->bRequestType,
    				      le16_to_cpup(&dr->wIndex));
    		if (ret) {
    			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;
    	}
    	as = alloc_async(uurb->number_of_packets);
    	if (!as) {
    		kfree(isopkt);
    		kfree(dr);
    		return -ENOMEM;
    	}
    	as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL);
    	if (!as->urb->transfer_buffer) {
    		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);
    
    	/* This tedious sequence is necessary because the URB_* flags
    	 * are internal to the kernel and subject to change, whereas
    	 * the USBDEVFS_URB_* flags are a user API and must not be changed.
    	 */
    	u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
    	if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
    		u |= URB_ISO_ASAP;
    	if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
    		u |= URB_SHORT_NOT_OK;
    	if (uurb->flags & USBDEVFS_URB_NO_FSBR)
    		u |= URB_NO_FSBR;
    	if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
    		u |= URB_ZERO_PACKET;
    	if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
    		u |= URB_NO_INTERRUPT;
    	as->urb->transfer_flags = u;
    
    	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);
    		as = async_getcompleted(ps);
    		if (as)
    			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:
    		if (!intf->dev.driver)
    			retval = device_attach(&intf->dev);
    		else
    			retval = -EBUSY;
    		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", __func__);
    		ret = proc_control(ps, p);
    		if (ret >= 0)
    			inode->i_mtime = CURRENT_TIME;
    		break;
    
    	case USBDEVFS_BULK:
    		snoop(&dev->dev, "%s: BULK\n", __func__);
    		ret = proc_bulk(ps, p);
    		if (ret >= 0)
    			inode->i_mtime = CURRENT_TIME;
    		break;
    
    	case USBDEVFS_RESETEP:
    		snoop(&dev->dev, "%s: RESETEP\n", __func__);
    		ret = proc_resetep(ps, p);
    		if (ret >= 0)
    			inode->i_mtime = CURRENT_TIME;
    		break;
    
    	case USBDEVFS_RESET:
    		snoop(&dev->dev, "%s: RESET\n", __func__);
    		ret = proc_resetdevice(ps);
    		break;
    
    	case USBDEVFS_CLEAR_HALT:
    		snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
    		ret = proc_clearhalt(ps, p);
    		if (ret >= 0)
    			inode->i_mtime = CURRENT_TIME;
    		break;
    
    	case USBDEVFS_GETDRIVER:
    		snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
    		ret = proc_getdriver(ps, p);
    		break;
    
    	case USBDEVFS_CONNECTINFO:
    		snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
    		ret = proc_connectinfo(ps, p);
    		break;
    
    	case USBDEVFS_SETINTERFACE:
    		snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
    		ret = proc_setintf(ps, p);
    		break;
    
    	case USBDEVFS_SETCONFIGURATION:
    		snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
    		ret = proc_setconfig(ps, p);
    		break;
    
    	case USBDEVFS_SUBMITURB:
    		snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
    		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", __func__);
    		ret = proc_submiturb_compat(ps, p);
    		if (ret >= 0)
    			inode->i_mtime = CURRENT_TIME;
    		break;
    
    	case USBDEVFS_REAPURB32:
    		snoop(&dev->dev, "%s: REAPURB32\n", __func__);
    		ret = proc_reapurb_compat(ps, p);
    		break;
    
    	case USBDEVFS_REAPURBNDELAY32:
    		snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__);
    		ret = proc_reapurbnonblock_compat(ps, p);
    		break;
    
    	case USBDEVFS_IOCTL32:
    		snoop(&dev->dev, "%s: IOCTL\n", __func__);
    		ret = proc_ioctl_compat(ps, ptr_to_compat(p));
    		break;
    #endif
    
    	case USBDEVFS_DISCARDURB:
    		snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
    		ret = proc_unlinkurb(ps, p);
    		break;
    
    	case USBDEVFS_REAPURB:
    		snoop(&dev->dev, "%s: REAPURB\n", __func__);
    		ret = proc_reapurb(ps, p);
    		break;
    
    	case USBDEVFS_REAPURBNDELAY:
    		snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__);
    		ret = proc_reapurbnonblock(ps, p);
    		break;
    
    	case USBDEVFS_DISCSIGNAL:
    		snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
    		ret = proc_disconnectsignal(ps, p);
    		break;
    
    	case USBDEVFS_CLAIMINTERFACE:
    		snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
    		ret = proc_claiminterface(ps, p);
    		break;
    
    	case USBDEVFS_RELEASEINTERFACE:
    		snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
    		ret = proc_releaseinterface(ps, p);
    		break;
    
    	case USBDEVFS_IOCTL:
    		snoop(&dev->dev, "%s: IOCTL\n", __func__);
    		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,
    };
    
    void usb_fs_classdev_common_remove(struct usb_device *udev)
    {
    	struct dev_state *ps;
    	struct siginfo sinfo;
    
    	while (!list_empty(&udev->filelist)) {
    		ps = list_entry(udev->filelist.next, struct dev_state, list);
    		destroy_all_async(ps);
    		wake_up_all(&ps->wait);
    		list_del_init(&ps->list);
    		if (ps->discsignr) {
    			sinfo.si_signo = ps->discsignr;
    			sinfo.si_errno = EPIPE;
    			sinfo.si_code = SI_ASYNCIO;
    			sinfo.si_addr = ps->disccontext;
    			kill_pid_info_as_uid(ps->discsignr, &sinfo,
    					ps->disc_pid, ps->disc_uid,
    					ps->disc_euid, ps->secid);
    		}
    	}
    }
    
    #ifdef CONFIG_USB_DEVICE_CLASS
    static struct class *usb_classdev_class;
    
    static int usb_classdev_add(struct usb_device *dev)
    {
    	struct device *cldev;
    
    	cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
    			      NULL, "usbdev%d.%d", dev->bus->busnum,
    			      dev->devnum);
    	if (IS_ERR(cldev))
    		return PTR_ERR(cldev);
    	dev->usb_classdev = cldev;
    	return 0;
    }
    
    static void usb_classdev_remove(struct usb_device *dev)
    {
    	if (dev->usb_classdev)
    		device_unregister(dev->usb_classdev);
    	usb_fs_classdev_common_remove(dev);
    }
    
    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) {
    		printk(KERN_ERR "Unable to register minors for usb_device\n");
    		goto out;
    	}
    	cdev_init(&usb_device_cdev, &usbdev_file_operations);
    	retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
    	if (retval) {
    		printk(KERN_ERR "Unable to get usb_device major %d\n",
    		       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)) {
    		printk(KERN_ERR "Unable to register usb_device class\n");
    		retval = PTR_ERR(usb_classdev_class);
    		cdev_del(&usb_device_cdev);
    		usb_classdev_class = NULL;
    		goto out;
    	}
    	/* devices of this class shadow the major:minor of their parent
    	 * device, so clear ->dev_kobj to prevent adding duplicate entries
    	 * to /sys/dev
    	 */
    	usb_classdev_class->dev_kobj = NULL;
    
    	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);
    }