1/*****************************************************************************/
   2
   3/*
   4 *      devio.c  --  User space communication with USB devices.
   5 *
   6 *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7 *
   8 *      This program is free software; you can redistribute it and/or modify
   9 *      it under the terms of the GNU General Public License as published by
  10 *      the Free Software Foundation; either version 2 of the License, or
  11 *      (at your option) any later version.
  12 *
  13 *      This program is distributed in the hope that it will be useful,
  14 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 *      GNU General Public License for more details.
  17 *
  18 *      You should have received a copy of the GNU General Public License
  19 *      along with this program; if not, write to the Free Software
  20 *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 *
  22 *  This file implements the usbfs/x/y files, where
  23 *  x is the bus number and y the device number.
  24 *
  25 *  It allows user space programs/"drivers" to communicate directly
  26 *  with USB devices without intervening kernel driver.
  27 *
  28 *  Revision history
  29 *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30 *    04.01.2000   0.2   Turned into its own filesystem
  31 *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32 *    			 (CAN-2005-3055)
  33 */
  34
  35/*****************************************************************************/
  36
  37#include <linux/fs.h>
  38#include <linux/mm.h>
  39#include <linux/slab.h>
  40#include <linux/signal.h>
  41#include <linux/poll.h>
  42#include <linux/module.h>
  43#include <linux/usb.h>
  44#include <linux/usbdevice_fs.h>
  45#include <linux/usb/hcd.h>	/* for usbcore internals */
  46#include <linux/cdev.h>
  47#include <linux/notifier.h>
  48#include <linux/security.h>
 
  49#include <asm/uaccess.h>
  50#include <asm/byteorder.h>
  51#include <linux/moduleparam.h>
  52
  53#include "usb.h"
  54
  55#define USB_MAXBUS			64
  56#define USB_DEVICE_MAX			USB_MAXBUS * 128
  57
  58/* Mutual exclusion for removal, open, and release */
  59DEFINE_MUTEX(usbfs_mutex);
  60
  61struct dev_state {
  62	struct list_head list;      /* state list */
  63	struct usb_device *dev;
  64	struct file *file;
  65	spinlock_t lock;            /* protects the async urb lists */
  66	struct list_head async_pending;
  67	struct list_head async_completed;
  68	wait_queue_head_t wait;     /* wake up if a request completed */
  69	unsigned int discsignr;
  70	struct pid *disc_pid;
  71	uid_t disc_uid, disc_euid;
  72	void __user *disccontext;
  73	unsigned long ifclaimed;
  74	u32 secid;
  75	u32 disabled_bulk_eps;
  76};
  77
  78struct async {
  79	struct list_head asynclist;
  80	struct dev_state *ps;
  81	struct pid *pid;
  82	uid_t uid, euid;
  83	unsigned int signr;
  84	unsigned int ifnum;
  85	void __user *userbuffer;
  86	void __user *userurb;
  87	struct urb *urb;
 
  88	int status;
  89	u32 secid;
  90	u8 bulk_addr;
  91	u8 bulk_status;
  92};
  93
  94static int usbfs_snoop;
  95module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  96MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  97
  98#define snoop(dev, format, arg...)				\
  99	do {							\
 100		if (usbfs_snoop)				\
 101			dev_info(dev , format , ## arg);	\
 102	} while (0)
 103
 104enum snoop_when {
 105	SUBMIT, COMPLETE
 106};
 107
 108#define USB_DEVICE_DEV		MKDEV(USB_DEVICE_MAJOR, 0)
 109
 110#define	MAX_USBFS_BUFFER_SIZE	16384
 
 
 
 
 111
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 112
 113static int connected(struct dev_state *ps)
 114{
 115	return (!list_empty(&ps->list) &&
 116			ps->dev->state != USB_STATE_NOTATTACHED);
 117}
 118
 119static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 120{
 121	loff_t ret;
 122
 123	mutex_lock(&file->f_dentry->d_inode->i_mutex);
 124
 125	switch (orig) {
 126	case 0:
 127		file->f_pos = offset;
 128		ret = file->f_pos;
 129		break;
 130	case 1:
 131		file->f_pos += offset;
 132		ret = file->f_pos;
 133		break;
 134	case 2:
 135	default:
 136		ret = -EINVAL;
 137	}
 138
 139	mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 140	return ret;
 141}
 142
 143static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 144			   loff_t *ppos)
 145{
 146	struct dev_state *ps = file->private_data;
 147	struct usb_device *dev = ps->dev;
 148	ssize_t ret = 0;
 149	unsigned len;
 150	loff_t pos;
 151	int i;
 152
 153	pos = *ppos;
 154	usb_lock_device(dev);
 155	if (!connected(ps)) {
 156		ret = -ENODEV;
 157		goto err;
 158	} else if (pos < 0) {
 159		ret = -EINVAL;
 160		goto err;
 161	}
 162
 163	if (pos < sizeof(struct usb_device_descriptor)) {
 164		/* 18 bytes - fits on the stack */
 165		struct usb_device_descriptor temp_desc;
 166
 167		memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 168		le16_to_cpus(&temp_desc.bcdUSB);
 169		le16_to_cpus(&temp_desc.idVendor);
 170		le16_to_cpus(&temp_desc.idProduct);
 171		le16_to_cpus(&temp_desc.bcdDevice);
 172
 173		len = sizeof(struct usb_device_descriptor) - pos;
 174		if (len > nbytes)
 175			len = nbytes;
 176		if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 177			ret = -EFAULT;
 178			goto err;
 179		}
 180
 181		*ppos += len;
 182		buf += len;
 183		nbytes -= len;
 184		ret += len;
 185	}
 186
 187	pos = sizeof(struct usb_device_descriptor);
 188	for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 189		struct usb_config_descriptor *config =
 190			(struct usb_config_descriptor *)dev->rawdescriptors[i];
 191		unsigned int length = le16_to_cpu(config->wTotalLength);
 192
 193		if (*ppos < pos + length) {
 194
 195			/* The descriptor may claim to be longer than it
 196			 * really is.  Here is the actual allocated length. */
 197			unsigned alloclen =
 198				le16_to_cpu(dev->config[i].desc.wTotalLength);
 199
 200			len = length - (*ppos - pos);
 201			if (len > nbytes)
 202				len = nbytes;
 203
 204			/* Simply don't write (skip over) unallocated parts */
 205			if (alloclen > (*ppos - pos)) {
 206				alloclen -= (*ppos - pos);
 207				if (copy_to_user(buf,
 208				    dev->rawdescriptors[i] + (*ppos - pos),
 209				    min(len, alloclen))) {
 210					ret = -EFAULT;
 211					goto err;
 212				}
 213			}
 214
 215			*ppos += len;
 216			buf += len;
 217			nbytes -= len;
 218			ret += len;
 219		}
 220
 221		pos += length;
 222	}
 223
 224err:
 225	usb_unlock_device(dev);
 226	return ret;
 227}
 228
 229/*
 230 * async list handling
 231 */
 232
 233static struct async *alloc_async(unsigned int numisoframes)
 234{
 235	struct async *as;
 236
 237	as = kzalloc(sizeof(struct async), GFP_KERNEL);
 238	if (!as)
 239		return NULL;
 240	as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 241	if (!as->urb) {
 242		kfree(as);
 243		return NULL;
 244	}
 245	return as;
 246}
 247
 248static void free_async(struct async *as)
 249{
 250	put_pid(as->pid);
 
 
 251	kfree(as->urb->transfer_buffer);
 252	kfree(as->urb->setup_packet);
 253	usb_free_urb(as->urb);
 
 254	kfree(as);
 255}
 256
 257static void async_newpending(struct async *as)
 258{
 259	struct dev_state *ps = as->ps;
 260	unsigned long flags;
 261
 262	spin_lock_irqsave(&ps->lock, flags);
 263	list_add_tail(&as->asynclist, &ps->async_pending);
 264	spin_unlock_irqrestore(&ps->lock, flags);
 265}
 266
 267static void async_removepending(struct async *as)
 268{
 269	struct dev_state *ps = as->ps;
 270	unsigned long flags;
 271
 272	spin_lock_irqsave(&ps->lock, flags);
 273	list_del_init(&as->asynclist);
 274	spin_unlock_irqrestore(&ps->lock, flags);
 275}
 276
 277static struct async *async_getcompleted(struct dev_state *ps)
 278{
 279	unsigned long flags;
 280	struct async *as = NULL;
 281
 282	spin_lock_irqsave(&ps->lock, flags);
 283	if (!list_empty(&ps->async_completed)) {
 284		as = list_entry(ps->async_completed.next, struct async,
 285				asynclist);
 286		list_del_init(&as->asynclist);
 287	}
 288	spin_unlock_irqrestore(&ps->lock, flags);
 289	return as;
 290}
 291
 292static struct async *async_getpending(struct dev_state *ps,
 293					     void __user *userurb)
 294{
 295	unsigned long flags;
 296	struct async *as;
 297
 298	spin_lock_irqsave(&ps->lock, flags);
 299	list_for_each_entry(as, &ps->async_pending, asynclist)
 300		if (as->userurb == userurb) {
 301			list_del_init(&as->asynclist);
 302			spin_unlock_irqrestore(&ps->lock, flags);
 303			return as;
 304		}
 305	spin_unlock_irqrestore(&ps->lock, flags);
 306	return NULL;
 307}
 308
 309static void snoop_urb(struct usb_device *udev,
 310		void __user *userurb, int pipe, unsigned length,
 311		int timeout_or_status, enum snoop_when when,
 312		unsigned char *data, unsigned data_len)
 313{
 314	static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 315	static const char *dirs[] = {"out", "in"};
 316	int ep;
 317	const char *t, *d;
 318
 319	if (!usbfs_snoop)
 320		return;
 321
 322	ep = usb_pipeendpoint(pipe);
 323	t = types[usb_pipetype(pipe)];
 324	d = dirs[!!usb_pipein(pipe)];
 325
 326	if (userurb) {		/* Async */
 327		if (when == SUBMIT)
 328			dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 329					"length %u\n",
 330					userurb, ep, t, d, length);
 331		else
 332			dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 333					"actual_length %u status %d\n",
 334					userurb, ep, t, d, length,
 335					timeout_or_status);
 336	} else {
 337		if (when == SUBMIT)
 338			dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 339					"timeout %d\n",
 340					ep, t, d, length, timeout_or_status);
 341		else
 342			dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 343					"status %d\n",
 344					ep, t, d, length, timeout_or_status);
 345	}
 346
 347	if (data && data_len > 0) {
 348		print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 349			data, data_len, 1);
 350	}
 351}
 352
 353#define AS_CONTINUATION	1
 354#define AS_UNLINK	2
 355
 356static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
 357__releases(ps->lock)
 358__acquires(ps->lock)
 359{
 
 360	struct async *as;
 361
 362	/* Mark all the pending URBs that match bulk_addr, up to but not
 363	 * including the first one without AS_CONTINUATION.  If such an
 364	 * URB is encountered then a new transfer has already started so
 365	 * the endpoint doesn't need to be disabled; otherwise it does.
 366	 */
 367	list_for_each_entry(as, &ps->async_pending, asynclist) {
 368		if (as->bulk_addr == bulk_addr) {
 369			if (as->bulk_status != AS_CONTINUATION)
 370				goto rescan;
 371			as->bulk_status = AS_UNLINK;
 372			as->bulk_addr = 0;
 373		}
 374	}
 375	ps->disabled_bulk_eps |= (1 << bulk_addr);
 376
 377	/* Now carefully unlink all the marked pending URBs */
 378 rescan:
 379	list_for_each_entry(as, &ps->async_pending, asynclist) {
 380		if (as->bulk_status == AS_UNLINK) {
 381			as->bulk_status = 0;		/* Only once */
 
 
 382			spin_unlock(&ps->lock);		/* Allow completions */
 383			usb_unlink_urb(as->urb);
 
 384			spin_lock(&ps->lock);
 385			goto rescan;
 386		}
 387	}
 388}
 389
 390static void async_completed(struct urb *urb)
 391{
 392	struct async *as = urb->context;
 393	struct dev_state *ps = as->ps;
 394	struct siginfo sinfo;
 395	struct pid *pid = NULL;
 396	uid_t uid = 0;
 397	uid_t euid = 0;
 398	u32 secid = 0;
 
 399	int signr;
 400
 401	spin_lock(&ps->lock);
 402	list_move_tail(&as->asynclist, &ps->async_completed);
 403	as->status = urb->status;
 404	signr = as->signr;
 405	if (signr) {
 406		sinfo.si_signo = as->signr;
 407		sinfo.si_errno = as->status;
 408		sinfo.si_code = SI_ASYNCIO;
 409		sinfo.si_addr = as->userurb;
 410		pid = as->pid;
 411		uid = as->uid;
 412		euid = as->euid;
 413		secid = as->secid;
 414	}
 415	snoop(&urb->dev->dev, "urb complete\n");
 416	snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 417			as->status, COMPLETE,
 418			((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_OUT) ?
 419				NULL : urb->transfer_buffer, urb->actual_length);
 420	if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 421			as->status != -ENOENT)
 422		cancel_bulk_urbs(ps, as->bulk_addr);
 423	spin_unlock(&ps->lock);
 424
 425	if (signr)
 426		kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
 427				      euid, secid);
 
 
 428
 429	wake_up(&ps->wait);
 430}
 431
 432static void destroy_async(struct dev_state *ps, struct list_head *list)
 433{
 
 434	struct async *as;
 435	unsigned long flags;
 436
 437	spin_lock_irqsave(&ps->lock, flags);
 438	while (!list_empty(list)) {
 439		as = list_entry(list->next, struct async, asynclist);
 440		list_del_init(&as->asynclist);
 
 
 441
 442		/* drop the spinlock so the completion handler can run */
 443		spin_unlock_irqrestore(&ps->lock, flags);
 444		usb_kill_urb(as->urb);
 
 445		spin_lock_irqsave(&ps->lock, flags);
 446	}
 447	spin_unlock_irqrestore(&ps->lock, flags);
 448}
 449
 450static void destroy_async_on_interface(struct dev_state *ps,
 451				       unsigned int ifnum)
 452{
 453	struct list_head *p, *q, hitlist;
 454	unsigned long flags;
 455
 456	INIT_LIST_HEAD(&hitlist);
 457	spin_lock_irqsave(&ps->lock, flags);
 458	list_for_each_safe(p, q, &ps->async_pending)
 459		if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 460			list_move_tail(p, &hitlist);
 461	spin_unlock_irqrestore(&ps->lock, flags);
 462	destroy_async(ps, &hitlist);
 463}
 464
 465static void destroy_all_async(struct dev_state *ps)
 466{
 467	destroy_async(ps, &ps->async_pending);
 468}
 469
 470/*
 471 * interface claims are made only at the request of user level code,
 472 * which can also release them (explicitly or by closing files).
 473 * they're also undone when devices disconnect.
 474 */
 475
 476static int driver_probe(struct usb_interface *intf,
 477			const struct usb_device_id *id)
 478{
 479	return -ENODEV;
 480}
 481
 482static void driver_disconnect(struct usb_interface *intf)
 483{
 484	struct dev_state *ps = usb_get_intfdata(intf);
 485	unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 486
 487	if (!ps)
 488		return;
 489
 490	/* NOTE:  this relies on usbcore having canceled and completed
 491	 * all pending I/O requests; 2.6 does that.
 492	 */
 493
 494	if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 495		clear_bit(ifnum, &ps->ifclaimed);
 496	else
 497		dev_warn(&intf->dev, "interface number %u out of range\n",
 498			 ifnum);
 499
 500	usb_set_intfdata(intf, NULL);
 501
 502	/* force async requests to complete */
 503	destroy_async_on_interface(ps, ifnum);
 504}
 505
 506/* The following routines are merely placeholders.  There is no way
 507 * to inform a user task about suspend or resumes.
 508 */
 509static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 510{
 511	return 0;
 512}
 513
 514static int driver_resume(struct usb_interface *intf)
 515{
 516	return 0;
 517}
 518
 519struct usb_driver usbfs_driver = {
 520	.name =		"usbfs",
 521	.probe =	driver_probe,
 522	.disconnect =	driver_disconnect,
 523	.suspend =	driver_suspend,
 524	.resume =	driver_resume,
 525};
 526
 527static int claimintf(struct dev_state *ps, unsigned int ifnum)
 528{
 529	struct usb_device *dev = ps->dev;
 530	struct usb_interface *intf;
 531	int err;
 532
 533	if (ifnum >= 8*sizeof(ps->ifclaimed))
 534		return -EINVAL;
 535	/* already claimed */
 536	if (test_bit(ifnum, &ps->ifclaimed))
 537		return 0;
 538
 539	intf = usb_ifnum_to_if(dev, ifnum);
 540	if (!intf)
 541		err = -ENOENT;
 542	else
 543		err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 544	if (err == 0)
 545		set_bit(ifnum, &ps->ifclaimed);
 546	return err;
 547}
 548
 549static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 550{
 551	struct usb_device *dev;
 552	struct usb_interface *intf;
 553	int err;
 554
 555	err = -EINVAL;
 556	if (ifnum >= 8*sizeof(ps->ifclaimed))
 557		return err;
 558	dev = ps->dev;
 559	intf = usb_ifnum_to_if(dev, ifnum);
 560	if (!intf)
 561		err = -ENOENT;
 562	else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 563		usb_driver_release_interface(&usbfs_driver, intf);
 564		err = 0;
 565	}
 566	return err;
 567}
 568
 569static int checkintf(struct dev_state *ps, unsigned int ifnum)
 570{
 571	if (ps->dev->state != USB_STATE_CONFIGURED)
 572		return -EHOSTUNREACH;
 573	if (ifnum >= 8*sizeof(ps->ifclaimed))
 574		return -EINVAL;
 575	if (test_bit(ifnum, &ps->ifclaimed))
 576		return 0;
 577	/* if not yet claimed, claim it for the driver */
 578	dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 579		 "interface %u before use\n", task_pid_nr(current),
 580		 current->comm, ifnum);
 581	return claimintf(ps, ifnum);
 582}
 583
 584static int findintfep(struct usb_device *dev, unsigned int ep)
 585{
 586	unsigned int i, j, e;
 587	struct usb_interface *intf;
 588	struct usb_host_interface *alts;
 589	struct usb_endpoint_descriptor *endpt;
 590
 591	if (ep & ~(USB_DIR_IN|0xf))
 592		return -EINVAL;
 593	if (!dev->actconfig)
 594		return -ESRCH;
 595	for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 596		intf = dev->actconfig->interface[i];
 597		for (j = 0; j < intf->num_altsetting; j++) {
 598			alts = &intf->altsetting[j];
 599			for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 600				endpt = &alts->endpoint[e].desc;
 601				if (endpt->bEndpointAddress == ep)
 602					return alts->desc.bInterfaceNumber;
 603			}
 604		}
 605	}
 606	return -ENOENT;
 607}
 608
 609static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 610			   unsigned int index)
 611{
 612	int ret = 0;
 
 613
 614	if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 615	 && ps->dev->state != USB_STATE_ADDRESS
 616	 && ps->dev->state != USB_STATE_CONFIGURED)
 617		return -EHOSTUNREACH;
 618	if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 619		return 0;
 620
 
 
 
 
 
 
 
 
 
 
 
 
 
 621	index &= 0xff;
 622	switch (requesttype & USB_RECIP_MASK) {
 623	case USB_RECIP_ENDPOINT:
 624		ret = findintfep(ps->dev, index);
 625		if (ret >= 0)
 626			ret = checkintf(ps, ret);
 627		break;
 628
 629	case USB_RECIP_INTERFACE:
 630		ret = checkintf(ps, index);
 631		break;
 632	}
 633	return ret;
 634}
 635
 636static int match_devt(struct device *dev, void *data)
 637{
 638	return dev->devt == (dev_t) (unsigned long) data;
 639}
 640
 641static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 642{
 643	struct device *dev;
 644
 645	dev = bus_find_device(&usb_bus_type, NULL,
 646			      (void *) (unsigned long) devt, match_devt);
 647	if (!dev)
 648		return NULL;
 649	return container_of(dev, struct usb_device, dev);
 650}
 651
 652/*
 653 * file operations
 654 */
 655static int usbdev_open(struct inode *inode, struct file *file)
 656{
 657	struct usb_device *dev = NULL;
 658	struct dev_state *ps;
 659	const struct cred *cred = current_cred();
 660	int ret;
 661
 662	ret = -ENOMEM;
 663	ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 664	if (!ps)
 665		goto out_free_ps;
 666
 667	ret = -ENODEV;
 668
 669	/* Protect against simultaneous removal or release */
 670	mutex_lock(&usbfs_mutex);
 671
 672	/* usbdev device-node */
 673	if (imajor(inode) == USB_DEVICE_MAJOR)
 674		dev = usbdev_lookup_by_devt(inode->i_rdev);
 675
 676#ifdef CONFIG_USB_DEVICEFS
 677	/* procfs file */
 678	if (!dev) {
 679		dev = inode->i_private;
 680		if (dev && dev->usbfs_dentry &&
 681					dev->usbfs_dentry->d_inode == inode)
 682			usb_get_dev(dev);
 683		else
 684			dev = NULL;
 685	}
 686#endif
 687	mutex_unlock(&usbfs_mutex);
 688
 689	if (!dev)
 690		goto out_free_ps;
 691
 692	usb_lock_device(dev);
 693	if (dev->state == USB_STATE_NOTATTACHED)
 694		goto out_unlock_device;
 695
 696	ret = usb_autoresume_device(dev);
 697	if (ret)
 698		goto out_unlock_device;
 699
 700	ps->dev = dev;
 701	ps->file = file;
 702	spin_lock_init(&ps->lock);
 703	INIT_LIST_HEAD(&ps->list);
 704	INIT_LIST_HEAD(&ps->async_pending);
 705	INIT_LIST_HEAD(&ps->async_completed);
 706	init_waitqueue_head(&ps->wait);
 707	ps->discsignr = 0;
 708	ps->disc_pid = get_pid(task_pid(current));
 709	ps->disc_uid = cred->uid;
 710	ps->disc_euid = cred->euid;
 711	ps->disccontext = NULL;
 712	ps->ifclaimed = 0;
 713	security_task_getsecid(current, &ps->secid);
 714	smp_wmb();
 715	list_add_tail(&ps->list, &dev->filelist);
 716	file->private_data = ps;
 717	usb_unlock_device(dev);
 718	snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 719			current->comm);
 720	return ret;
 721
 722 out_unlock_device:
 723	usb_unlock_device(dev);
 724	usb_put_dev(dev);
 725 out_free_ps:
 726	kfree(ps);
 727	return ret;
 728}
 729
 730static int usbdev_release(struct inode *inode, struct file *file)
 731{
 732	struct dev_state *ps = file->private_data;
 733	struct usb_device *dev = ps->dev;
 734	unsigned int ifnum;
 735	struct async *as;
 736
 737	usb_lock_device(dev);
 738	usb_hub_release_all_ports(dev, ps);
 739
 740	list_del_init(&ps->list);
 741
 742	for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 743			ifnum++) {
 744		if (test_bit(ifnum, &ps->ifclaimed))
 745			releaseintf(ps, ifnum);
 746	}
 747	destroy_all_async(ps);
 748	usb_autosuspend_device(dev);
 749	usb_unlock_device(dev);
 750	usb_put_dev(dev);
 751	put_pid(ps->disc_pid);
 
 752
 753	as = async_getcompleted(ps);
 754	while (as) {
 755		free_async(as);
 756		as = async_getcompleted(ps);
 757	}
 758	kfree(ps);
 759	return 0;
 760}
 761
 762static int proc_control(struct dev_state *ps, void __user *arg)
 763{
 764	struct usb_device *dev = ps->dev;
 765	struct usbdevfs_ctrltransfer ctrl;
 766	unsigned int tmo;
 767	unsigned char *tbuf;
 768	unsigned wLength;
 769	int i, pipe, ret;
 770
 771	if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 772		return -EFAULT;
 773	ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
 
 774	if (ret)
 775		return ret;
 776	wLength = ctrl.wLength;		/* To suppress 64k PAGE_SIZE warning */
 777	if (wLength > PAGE_SIZE)
 778		return -EINVAL;
 
 
 
 
 779	tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 780	if (!tbuf)
 781		return -ENOMEM;
 
 
 782	tmo = ctrl.timeout;
 783	snoop(&dev->dev, "control urb: bRequestType=%02x "
 784		"bRequest=%02x wValue=%04x "
 785		"wIndex=%04x wLength=%04x\n",
 786		ctrl.bRequestType, ctrl.bRequest,
 787		__le16_to_cpup(&ctrl.wValue),
 788		__le16_to_cpup(&ctrl.wIndex),
 789		__le16_to_cpup(&ctrl.wLength));
 790	if (ctrl.bRequestType & 0x80) {
 791		if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 792					       ctrl.wLength)) {
 793			free_page((unsigned long)tbuf);
 794			return -EINVAL;
 795		}
 796		pipe = usb_rcvctrlpipe(dev, 0);
 797		snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
 798
 799		usb_unlock_device(dev);
 800		i = usb_control_msg(dev, pipe, ctrl.bRequest,
 801				    ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 802				    tbuf, ctrl.wLength, tmo);
 803		usb_lock_device(dev);
 804		snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
 805			  tbuf, max(i, 0));
 806		if ((i > 0) && ctrl.wLength) {
 807			if (copy_to_user(ctrl.data, tbuf, i)) {
 808				free_page((unsigned long)tbuf);
 809				return -EFAULT;
 810			}
 811		}
 812	} else {
 813		if (ctrl.wLength) {
 814			if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 815				free_page((unsigned long)tbuf);
 816				return -EFAULT;
 817			}
 818		}
 819		pipe = usb_sndctrlpipe(dev, 0);
 820		snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
 821			tbuf, ctrl.wLength);
 822
 823		usb_unlock_device(dev);
 824		i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 825				    ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 826				    tbuf, ctrl.wLength, tmo);
 827		usb_lock_device(dev);
 828		snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
 829	}
 830	free_page((unsigned long)tbuf);
 831	if (i < 0 && i != -EPIPE) {
 832		dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 833			   "failed cmd %s rqt %u rq %u len %u ret %d\n",
 834			   current->comm, ctrl.bRequestType, ctrl.bRequest,
 835			   ctrl.wLength, i);
 836	}
 837	return i;
 
 
 
 
 
 838}
 839
 840static int proc_bulk(struct dev_state *ps, void __user *arg)
 841{
 842	struct usb_device *dev = ps->dev;
 843	struct usbdevfs_bulktransfer bulk;
 844	unsigned int tmo, len1, pipe;
 845	int len2;
 846	unsigned char *tbuf;
 847	int i, ret;
 848
 849	if (copy_from_user(&bulk, arg, sizeof(bulk)))
 850		return -EFAULT;
 851	ret = findintfep(ps->dev, bulk.ep);
 852	if (ret < 0)
 853		return ret;
 854	ret = checkintf(ps, ret);
 855	if (ret)
 856		return ret;
 857	if (bulk.ep & USB_DIR_IN)
 858		pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 859	else
 860		pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 861	if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 862		return -EINVAL;
 863	len1 = bulk.len;
 864	if (len1 > MAX_USBFS_BUFFER_SIZE)
 865		return -EINVAL;
 866	if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
 867		return -ENOMEM;
 
 
 
 
 
 868	tmo = bulk.timeout;
 869	if (bulk.ep & 0x80) {
 870		if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 871			kfree(tbuf);
 872			return -EINVAL;
 873		}
 874		snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
 875
 876		usb_unlock_device(dev);
 877		i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 878		usb_lock_device(dev);
 879		snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
 880
 881		if (!i && len2) {
 882			if (copy_to_user(bulk.data, tbuf, len2)) {
 883				kfree(tbuf);
 884				return -EFAULT;
 885			}
 886		}
 887	} else {
 888		if (len1) {
 889			if (copy_from_user(tbuf, bulk.data, len1)) {
 890				kfree(tbuf);
 891				return -EFAULT;
 892			}
 893		}
 894		snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
 895
 896		usb_unlock_device(dev);
 897		i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 898		usb_lock_device(dev);
 899		snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
 900	}
 
 
 901	kfree(tbuf);
 902	if (i < 0)
 903		return i;
 904	return len2;
 905}
 906
 907static int proc_resetep(struct dev_state *ps, void __user *arg)
 908{
 909	unsigned int ep;
 910	int ret;
 911
 912	if (get_user(ep, (unsigned int __user *)arg))
 913		return -EFAULT;
 914	ret = findintfep(ps->dev, ep);
 915	if (ret < 0)
 916		return ret;
 917	ret = checkintf(ps, ret);
 918	if (ret)
 919		return ret;
 920	usb_reset_endpoint(ps->dev, ep);
 921	return 0;
 922}
 923
 924static int proc_clearhalt(struct dev_state *ps, void __user *arg)
 925{
 926	unsigned int ep;
 927	int pipe;
 928	int ret;
 929
 930	if (get_user(ep, (unsigned int __user *)arg))
 931		return -EFAULT;
 932	ret = findintfep(ps->dev, ep);
 933	if (ret < 0)
 934		return ret;
 935	ret = checkintf(ps, ret);
 936	if (ret)
 937		return ret;
 938	if (ep & USB_DIR_IN)
 939		pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
 940	else
 941		pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
 942
 943	return usb_clear_halt(ps->dev, pipe);
 944}
 945
 946static int proc_getdriver(struct dev_state *ps, void __user *arg)
 947{
 948	struct usbdevfs_getdriver gd;
 949	struct usb_interface *intf;
 950	int ret;
 951
 952	if (copy_from_user(&gd, arg, sizeof(gd)))
 953		return -EFAULT;
 954	intf = usb_ifnum_to_if(ps->dev, gd.interface);
 955	if (!intf || !intf->dev.driver)
 956		ret = -ENODATA;
 957	else {
 958		strncpy(gd.driver, intf->dev.driver->name,
 959				sizeof(gd.driver));
 960		ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
 961	}
 962	return ret;
 963}
 964
 965static int proc_connectinfo(struct dev_state *ps, void __user *arg)
 966{
 967	struct usbdevfs_connectinfo ci = {
 968		.devnum = ps->dev->devnum,
 969		.slow = ps->dev->speed == USB_SPEED_LOW
 970	};
 971
 972	if (copy_to_user(arg, &ci, sizeof(ci)))
 973		return -EFAULT;
 974	return 0;
 975}
 976
 977static int proc_resetdevice(struct dev_state *ps)
 978{
 979	return usb_reset_device(ps->dev);
 980}
 981
 982static int proc_setintf(struct dev_state *ps, void __user *arg)
 983{
 984	struct usbdevfs_setinterface setintf;
 985	int ret;
 986
 987	if (copy_from_user(&setintf, arg, sizeof(setintf)))
 988		return -EFAULT;
 989	if ((ret = checkintf(ps, setintf.interface)))
 990		return ret;
 991	return usb_set_interface(ps->dev, setintf.interface,
 992			setintf.altsetting);
 993}
 994
 995static int proc_setconfig(struct dev_state *ps, void __user *arg)
 996{
 997	int u;
 998	int status = 0;
 999	struct usb_host_config *actconfig;
1000
1001	if (get_user(u, (int __user *)arg))
1002		return -EFAULT;
1003
1004	actconfig = ps->dev->actconfig;
1005
1006	/* Don't touch the device if any interfaces are claimed.
1007	 * It could interfere with other drivers' operations, and if
1008	 * an interface is claimed by usbfs it could easily deadlock.
1009	 */
1010	if (actconfig) {
1011		int i;
1012
1013		for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1014			if (usb_interface_claimed(actconfig->interface[i])) {
1015				dev_warn(&ps->dev->dev,
1016					"usbfs: interface %d claimed by %s "
1017					"while '%s' sets config #%d\n",
1018					actconfig->interface[i]
1019						->cur_altsetting
1020						->desc.bInterfaceNumber,
1021					actconfig->interface[i]
1022						->dev.driver->name,
1023					current->comm, u);
1024				status = -EBUSY;
1025				break;
1026			}
1027		}
1028	}
1029
1030	/* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1031	 * so avoid usb_set_configuration()'s kick to sysfs
1032	 */
1033	if (status == 0) {
1034		if (actconfig && actconfig->desc.bConfigurationValue == u)
1035			status = usb_reset_configuration(ps->dev);
1036		else
1037			status = usb_set_configuration(ps->dev, u);
1038	}
1039
1040	return status;
1041}
1042
1043static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1044			struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1045			void __user *arg)
1046{
1047	struct usbdevfs_iso_packet_desc *isopkt = NULL;
1048	struct usb_host_endpoint *ep;
1049	struct async *as;
1050	struct usb_ctrlrequest *dr = NULL;
1051	const struct cred *cred = current_cred();
1052	unsigned int u, totlen, isofrmlen;
1053	int ret, ifnum = -1;
1054	int is_in;
1055
1056	if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1057				USBDEVFS_URB_SHORT_NOT_OK |
1058				USBDEVFS_URB_BULK_CONTINUATION |
1059				USBDEVFS_URB_NO_FSBR |
1060				USBDEVFS_URB_ZERO_PACKET |
1061				USBDEVFS_URB_NO_INTERRUPT))
1062		return -EINVAL;
1063	if (uurb->buffer_length > 0 && !uurb->buffer)
1064		return -EINVAL;
1065	if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1066	    (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1067		ifnum = findintfep(ps->dev, uurb->endpoint);
1068		if (ifnum < 0)
1069			return ifnum;
1070		ret = checkintf(ps, ifnum);
1071		if (ret)
1072			return ret;
1073	}
1074	if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1075		is_in = 1;
1076		ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1077	} else {
1078		is_in = 0;
1079		ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1080	}
1081	if (!ep)
1082		return -ENOENT;
 
 
1083	switch(uurb->type) {
1084	case USBDEVFS_URB_TYPE_CONTROL:
1085		if (!usb_endpoint_xfer_control(&ep->desc))
1086			return -EINVAL;
1087		/* min 8 byte setup packet,
1088		 * max 8 byte setup plus an arbitrary data stage */
1089		if (uurb->buffer_length < 8 ||
1090		    uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1091			return -EINVAL;
1092		dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1093		if (!dr)
1094			return -ENOMEM;
1095		if (copy_from_user(dr, uurb->buffer, 8)) {
1096			kfree(dr);
1097			return -EFAULT;
1098		}
1099		if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1100			kfree(dr);
1101			return -EINVAL;
1102		}
1103		ret = check_ctrlrecip(ps, dr->bRequestType,
1104				      le16_to_cpup(&dr->wIndex));
1105		if (ret) {
1106			kfree(dr);
1107			return ret;
1108		}
1109		uurb->number_of_packets = 0;
1110		uurb->buffer_length = le16_to_cpup(&dr->wLength);
1111		uurb->buffer += 8;
1112		if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1113			is_in = 1;
1114			uurb->endpoint |= USB_DIR_IN;
1115		} else {
1116			is_in = 0;
1117			uurb->endpoint &= ~USB_DIR_IN;
1118		}
1119		snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1120			"bRequest=%02x wValue=%04x "
1121			"wIndex=%04x wLength=%04x\n",
1122			dr->bRequestType, dr->bRequest,
1123			__le16_to_cpup(&dr->wValue),
1124			__le16_to_cpup(&dr->wIndex),
1125			__le16_to_cpup(&dr->wLength));
 
1126		break;
1127
1128	case USBDEVFS_URB_TYPE_BULK:
1129		switch (usb_endpoint_type(&ep->desc)) {
1130		case USB_ENDPOINT_XFER_CONTROL:
1131		case USB_ENDPOINT_XFER_ISOC:
1132			return -EINVAL;
1133		case USB_ENDPOINT_XFER_INT:
1134			/* allow single-shot interrupt transfers */
1135			uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1136			goto interrupt_urb;
1137		}
1138		uurb->number_of_packets = 0;
1139		if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1140			return -EINVAL;
1141		break;
1142
1143	case USBDEVFS_URB_TYPE_INTERRUPT:
1144		if (!usb_endpoint_xfer_int(&ep->desc))
1145			return -EINVAL;
1146 interrupt_urb:
1147		uurb->number_of_packets = 0;
1148		if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1149			return -EINVAL;
1150		break;
1151
1152	case USBDEVFS_URB_TYPE_ISO:
1153		/* arbitrary limit */
1154		if (uurb->number_of_packets < 1 ||
1155		    uurb->number_of_packets > 128)
1156			return -EINVAL;
1157		if (!usb_endpoint_xfer_isoc(&ep->desc))
1158			return -EINVAL;
1159		isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1160				   uurb->number_of_packets;
1161		if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1162			return -ENOMEM;
1163		if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1164			kfree(isopkt);
1165			return -EFAULT;
1166		}
1167		for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1168			/* arbitrary limit,
1169			 * sufficient for USB 2.0 high-bandwidth iso */
1170			if (isopkt[u].length > 8192) {
1171				kfree(isopkt);
1172				return -EINVAL;
1173			}
1174			totlen += isopkt[u].length;
1175		}
1176		/* 3072 * 64 microframes */
1177		if (totlen > 196608) {
1178			kfree(isopkt);
1179			return -EINVAL;
1180		}
1181		uurb->buffer_length = totlen;
1182		break;
1183
1184	default:
1185		return -EINVAL;
1186	}
 
 
 
 
 
1187	if (uurb->buffer_length > 0 &&
1188			!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1189				uurb->buffer, uurb->buffer_length)) {
1190		kfree(isopkt);
1191		kfree(dr);
1192		return -EFAULT;
1193	}
1194	as = alloc_async(uurb->number_of_packets);
1195	if (!as) {
1196		kfree(isopkt);
1197		kfree(dr);
1198		return -ENOMEM;
1199	}
 
 
 
 
 
 
1200	if (uurb->buffer_length > 0) {
1201		as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1202				GFP_KERNEL);
1203		if (!as->urb->transfer_buffer) {
1204			kfree(isopkt);
1205			kfree(dr);
1206			free_async(as);
1207			return -ENOMEM;
1208		}
1209		/* Isochronous input data may end up being discontiguous
1210		 * if some of the packets are short.  Clear the buffer so
1211		 * that the gaps don't leak kernel data to userspace.
1212		 */
1213		if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO)
1214			memset(as->urb->transfer_buffer, 0,
1215					uurb->buffer_length);
1216	}
1217	as->urb->dev = ps->dev;
1218	as->urb->pipe = (uurb->type << 30) |
1219			__create_pipe(ps->dev, uurb->endpoint & 0xf) |
1220			(uurb->endpoint & USB_DIR_IN);
1221
1222	/* This tedious sequence is necessary because the URB_* flags
1223	 * are internal to the kernel and subject to change, whereas
1224	 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1225	 */
1226	u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1227	if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1228		u |= URB_ISO_ASAP;
1229	if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1230		u |= URB_SHORT_NOT_OK;
1231	if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1232		u |= URB_NO_FSBR;
1233	if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1234		u |= URB_ZERO_PACKET;
1235	if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1236		u |= URB_NO_INTERRUPT;
1237	as->urb->transfer_flags = u;
1238
1239	as->urb->transfer_buffer_length = uurb->buffer_length;
1240	as->urb->setup_packet = (unsigned char *)dr;
 
1241	as->urb->start_frame = uurb->start_frame;
1242	as->urb->number_of_packets = uurb->number_of_packets;
1243	if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1244			ps->dev->speed == USB_SPEED_HIGH)
1245		as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1246	else
1247		as->urb->interval = ep->desc.bInterval;
1248	as->urb->context = as;
1249	as->urb->complete = async_completed;
1250	for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1251		as->urb->iso_frame_desc[u].offset = totlen;
1252		as->urb->iso_frame_desc[u].length = isopkt[u].length;
1253		totlen += isopkt[u].length;
1254	}
1255	kfree(isopkt);
 
1256	as->ps = ps;
1257	as->userurb = arg;
1258	if (is_in && uurb->buffer_length > 0)
1259		as->userbuffer = uurb->buffer;
1260	else
1261		as->userbuffer = NULL;
1262	as->signr = uurb->signr;
1263	as->ifnum = ifnum;
1264	as->pid = get_pid(task_pid(current));
1265	as->uid = cred->uid;
1266	as->euid = cred->euid;
1267	security_task_getsecid(current, &as->secid);
1268	if (!is_in && uurb->buffer_length > 0) {
1269		if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1270				uurb->buffer_length)) {
1271			free_async(as);
1272			return -EFAULT;
1273		}
1274	}
1275	snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1276			as->urb->transfer_buffer_length, 0, SUBMIT,
1277			is_in ? NULL : as->urb->transfer_buffer,
1278				uurb->buffer_length);
1279	async_newpending(as);
1280
1281	if (usb_endpoint_xfer_bulk(&ep->desc)) {
1282		spin_lock_irq(&ps->lock);
1283
1284		/* Not exactly the endpoint address; the direction bit is
1285		 * shifted to the 0x10 position so that the value will be
1286		 * between 0 and 31.
1287		 */
1288		as->bulk_addr = usb_endpoint_num(&ep->desc) |
1289			((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1290				>> 3);
1291
1292		/* If this bulk URB is the start of a new transfer, re-enable
1293		 * the endpoint.  Otherwise mark it as a continuation URB.
1294		 */
1295		if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1296			as->bulk_status = AS_CONTINUATION;
1297		else
1298			ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1299
1300		/* Don't accept continuation URBs if the endpoint is
1301		 * disabled because of an earlier error.
1302		 */
1303		if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1304			ret = -EREMOTEIO;
1305		else
1306			ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1307		spin_unlock_irq(&ps->lock);
1308	} else {
1309		ret = usb_submit_urb(as->urb, GFP_KERNEL);
1310	}
1311
1312	if (ret) {
1313		dev_printk(KERN_DEBUG, &ps->dev->dev,
1314			   "usbfs: usb_submit_urb returned %d\n", ret);
1315		snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1316				0, ret, COMPLETE, NULL, 0);
1317		async_removepending(as);
1318		free_async(as);
1319		return ret;
1320	}
1321	return 0;
 
 
 
 
 
 
 
1322}
1323
1324static int proc_submiturb(struct dev_state *ps, void __user *arg)
1325{
1326	struct usbdevfs_urb uurb;
1327
1328	if (copy_from_user(&uurb, arg, sizeof(uurb)))
1329		return -EFAULT;
1330
1331	return proc_do_submiturb(ps, &uurb,
1332			(((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1333			arg);
1334}
1335
1336static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1337{
 
1338	struct async *as;
 
1339
 
1340	as = async_getpending(ps, arg);
1341	if (!as)
 
1342		return -EINVAL;
1343	usb_kill_urb(as->urb);
 
 
 
 
 
 
 
 
1344	return 0;
1345}
1346
1347static int processcompl(struct async *as, void __user * __user *arg)
1348{
1349	struct urb *urb = as->urb;
1350	struct usbdevfs_urb __user *userurb = as->userurb;
1351	void __user *addr = as->userurb;
1352	unsigned int i;
1353
1354	if (as->userbuffer && urb->actual_length) {
1355		if (urb->number_of_packets > 0)		/* Isochronous */
1356			i = urb->transfer_buffer_length;
1357		else					/* Non-Isoc */
1358			i = urb->actual_length;
1359		if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1360			goto err_out;
1361	}
1362	if (put_user(as->status, &userurb->status))
1363		goto err_out;
1364	if (put_user(urb->actual_length, &userurb->actual_length))
1365		goto err_out;
1366	if (put_user(urb->error_count, &userurb->error_count))
1367		goto err_out;
1368
1369	if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1370		for (i = 0; i < urb->number_of_packets; i++) {
1371			if (put_user(urb->iso_frame_desc[i].actual_length,
1372				     &userurb->iso_frame_desc[i].actual_length))
1373				goto err_out;
1374			if (put_user(urb->iso_frame_desc[i].status,
1375				     &userurb->iso_frame_desc[i].status))
1376				goto err_out;
1377		}
1378	}
1379
1380	if (put_user(addr, (void __user * __user *)arg))
1381		return -EFAULT;
1382	return 0;
1383
1384err_out:
1385	return -EFAULT;
1386}
1387
1388static struct async *reap_as(struct dev_state *ps)
1389{
1390	DECLARE_WAITQUEUE(wait, current);
1391	struct async *as = NULL;
1392	struct usb_device *dev = ps->dev;
1393
1394	add_wait_queue(&ps->wait, &wait);
1395	for (;;) {
1396		__set_current_state(TASK_INTERRUPTIBLE);
1397		as = async_getcompleted(ps);
1398		if (as)
1399			break;
1400		if (signal_pending(current))
1401			break;
1402		usb_unlock_device(dev);
1403		schedule();
1404		usb_lock_device(dev);
1405	}
1406	remove_wait_queue(&ps->wait, &wait);
1407	set_current_state(TASK_RUNNING);
1408	return as;
1409}
1410
1411static int proc_reapurb(struct dev_state *ps, void __user *arg)
1412{
1413	struct async *as = reap_as(ps);
1414	if (as) {
1415		int retval = processcompl(as, (void __user * __user *)arg);
1416		free_async(as);
1417		return retval;
1418	}
1419	if (signal_pending(current))
1420		return -EINTR;
1421	return -EIO;
1422}
1423
1424static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1425{
1426	int retval;
1427	struct async *as;
1428
1429	as = async_getcompleted(ps);
1430	retval = -EAGAIN;
1431	if (as) {
1432		retval = processcompl(as, (void __user * __user *)arg);
1433		free_async(as);
1434	}
1435	return retval;
1436}
1437
1438#ifdef CONFIG_COMPAT
1439static int proc_control_compat(struct dev_state *ps,
1440				struct usbdevfs_ctrltransfer32 __user *p32)
1441{
1442        struct usbdevfs_ctrltransfer __user *p;
1443        __u32 udata;
1444        p = compat_alloc_user_space(sizeof(*p));
1445        if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1446            get_user(udata, &p32->data) ||
1447	    put_user(compat_ptr(udata), &p->data))
1448		return -EFAULT;
1449        return proc_control(ps, p);
1450}
1451
1452static int proc_bulk_compat(struct dev_state *ps,
1453			struct usbdevfs_bulktransfer32 __user *p32)
1454{
1455        struct usbdevfs_bulktransfer __user *p;
1456        compat_uint_t n;
1457        compat_caddr_t addr;
1458
1459        p = compat_alloc_user_space(sizeof(*p));
1460
1461        if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1462            get_user(n, &p32->len) || put_user(n, &p->len) ||
1463            get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1464            get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1465                return -EFAULT;
1466
1467        return proc_bulk(ps, p);
1468}
1469static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1470{
1471	struct usbdevfs_disconnectsignal32 ds;
1472
1473	if (copy_from_user(&ds, arg, sizeof(ds)))
1474		return -EFAULT;
1475	ps->discsignr = ds.signr;
1476	ps->disccontext = compat_ptr(ds.context);
1477	return 0;
1478}
1479
1480static int get_urb32(struct usbdevfs_urb *kurb,
1481		     struct usbdevfs_urb32 __user *uurb)
1482{
1483	__u32  uptr;
1484	if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1485	    __get_user(kurb->type, &uurb->type) ||
1486	    __get_user(kurb->endpoint, &uurb->endpoint) ||
1487	    __get_user(kurb->status, &uurb->status) ||
1488	    __get_user(kurb->flags, &uurb->flags) ||
1489	    __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1490	    __get_user(kurb->actual_length, &uurb->actual_length) ||
1491	    __get_user(kurb->start_frame, &uurb->start_frame) ||
1492	    __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1493	    __get_user(kurb->error_count, &uurb->error_count) ||
1494	    __get_user(kurb->signr, &uurb->signr))
1495		return -EFAULT;
1496
1497	if (__get_user(uptr, &uurb->buffer))
1498		return -EFAULT;
1499	kurb->buffer = compat_ptr(uptr);
1500	if (__get_user(uptr, &uurb->usercontext))
1501		return -EFAULT;
1502	kurb->usercontext = compat_ptr(uptr);
1503
1504	return 0;
1505}
1506
1507static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1508{
1509	struct usbdevfs_urb uurb;
1510
1511	if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1512		return -EFAULT;
1513
1514	return proc_do_submiturb(ps, &uurb,
1515			((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1516			arg);
1517}
1518
1519static int processcompl_compat(struct async *as, void __user * __user *arg)
1520{
1521	struct urb *urb = as->urb;
1522	struct usbdevfs_urb32 __user *userurb = as->userurb;
1523	void __user *addr = as->userurb;
1524	unsigned int i;
1525
1526	if (as->userbuffer && urb->actual_length)
1527		if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1528				 urb->actual_length))
 
 
 
1529			return -EFAULT;
 
1530	if (put_user(as->status, &userurb->status))
1531		return -EFAULT;
1532	if (put_user(urb->actual_length, &userurb->actual_length))
1533		return -EFAULT;
1534	if (put_user(urb->error_count, &userurb->error_count))
1535		return -EFAULT;
1536
1537	if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1538		for (i = 0; i < urb->number_of_packets; i++) {
1539			if (put_user(urb->iso_frame_desc[i].actual_length,
1540				     &userurb->iso_frame_desc[i].actual_length))
1541				return -EFAULT;
1542			if (put_user(urb->iso_frame_desc[i].status,
1543				     &userurb->iso_frame_desc[i].status))
1544				return -EFAULT;
1545		}
1546	}
1547
1548	if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1549		return -EFAULT;
1550	return 0;
1551}
1552
1553static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1554{
1555	struct async *as = reap_as(ps);
1556	if (as) {
1557		int retval = processcompl_compat(as, (void __user * __user *)arg);
1558		free_async(as);
1559		return retval;
1560	}
1561	if (signal_pending(current))
1562		return -EINTR;
1563	return -EIO;
1564}
1565
1566static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1567{
1568	int retval;
1569	struct async *as;
1570
1571	retval = -EAGAIN;
1572	as = async_getcompleted(ps);
1573	if (as) {
1574		retval = processcompl_compat(as, (void __user * __user *)arg);
1575		free_async(as);
1576	}
1577	return retval;
1578}
1579
1580
1581#endif
1582
1583static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1584{
1585	struct usbdevfs_disconnectsignal ds;
1586
1587	if (copy_from_user(&ds, arg, sizeof(ds)))
1588		return -EFAULT;
1589	ps->discsignr = ds.signr;
1590	ps->disccontext = ds.context;
1591	return 0;
1592}
1593
1594static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1595{
1596	unsigned int ifnum;
1597
1598	if (get_user(ifnum, (unsigned int __user *)arg))
1599		return -EFAULT;
1600	return claimintf(ps, ifnum);
1601}
1602
1603static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1604{
1605	unsigned int ifnum;
1606	int ret;
1607
1608	if (get_user(ifnum, (unsigned int __user *)arg))
1609		return -EFAULT;
1610	if ((ret = releaseintf(ps, ifnum)) < 0)
1611		return ret;
1612	destroy_async_on_interface (ps, ifnum);
1613	return 0;
1614}
1615
1616static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1617{
1618	int			size;
1619	void			*buf = NULL;
1620	int			retval = 0;
1621	struct usb_interface    *intf = NULL;
1622	struct usb_driver       *driver = NULL;
1623
1624	/* alloc buffer */
1625	if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1626		if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1627			return -ENOMEM;
1628		if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1629			if (copy_from_user(buf, ctl->data, size)) {
1630				kfree(buf);
1631				return -EFAULT;
1632			}
1633		} else {
1634			memset(buf, 0, size);
1635		}
1636	}
1637
1638	if (!connected(ps)) {
1639		kfree(buf);
1640		return -ENODEV;
1641	}
1642
1643	if (ps->dev->state != USB_STATE_CONFIGURED)
1644		retval = -EHOSTUNREACH;
1645	else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1646		retval = -EINVAL;
1647	else switch (ctl->ioctl_code) {
1648
1649	/* disconnect kernel driver from interface */
1650	case USBDEVFS_DISCONNECT:
1651		if (intf->dev.driver) {
1652			driver = to_usb_driver(intf->dev.driver);
1653			dev_dbg(&intf->dev, "disconnect by usbfs\n");
1654			usb_driver_release_interface(driver, intf);
1655		} else
1656			retval = -ENODATA;
1657		break;
1658
1659	/* let kernel drivers try to (re)bind to the interface */
1660	case USBDEVFS_CONNECT:
1661		if (!intf->dev.driver)
1662			retval = device_attach(&intf->dev);
1663		else
1664			retval = -EBUSY;
1665		break;
1666
1667	/* talk directly to the interface's driver */
1668	default:
1669		if (intf->dev.driver)
1670			driver = to_usb_driver(intf->dev.driver);
1671		if (driver == NULL || driver->unlocked_ioctl == NULL) {
1672			retval = -ENOTTY;
1673		} else {
1674			retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1675			if (retval == -ENOIOCTLCMD)
1676				retval = -ENOTTY;
1677		}
1678	}
1679
1680	/* cleanup and return */
1681	if (retval >= 0
1682			&& (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1683			&& size > 0
1684			&& copy_to_user(ctl->data, buf, size) != 0)
1685		retval = -EFAULT;
1686
1687	kfree(buf);
1688	return retval;
1689}
1690
1691static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1692{
1693	struct usbdevfs_ioctl	ctrl;
1694
1695	if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1696		return -EFAULT;
1697	return proc_ioctl(ps, &ctrl);
1698}
1699
1700#ifdef CONFIG_COMPAT
1701static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1702{
1703	struct usbdevfs_ioctl32 __user *uioc;
1704	struct usbdevfs_ioctl ctrl;
1705	u32 udata;
1706
1707	uioc = compat_ptr((long)arg);
1708	if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1709	    __get_user(ctrl.ifno, &uioc->ifno) ||
1710	    __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1711	    __get_user(udata, &uioc->data))
1712		return -EFAULT;
1713	ctrl.data = compat_ptr(udata);
1714
1715	return proc_ioctl(ps, &ctrl);
1716}
1717#endif
1718
1719static int proc_claim_port(struct dev_state *ps, void __user *arg)
1720{
1721	unsigned portnum;
1722	int rc;
1723
1724	if (get_user(portnum, (unsigned __user *) arg))
1725		return -EFAULT;
1726	rc = usb_hub_claim_port(ps->dev, portnum, ps);
1727	if (rc == 0)
1728		snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1729			portnum, task_pid_nr(current), current->comm);
1730	return rc;
1731}
1732
1733static int proc_release_port(struct dev_state *ps, void __user *arg)
1734{
1735	unsigned portnum;
1736
1737	if (get_user(portnum, (unsigned __user *) arg))
1738		return -EFAULT;
1739	return usb_hub_release_port(ps->dev, portnum, ps);
1740}
1741
1742/*
1743 * NOTE:  All requests here that have interface numbers as parameters
1744 * are assuming that somehow the configuration has been prevented from
1745 * changing.  But there's no mechanism to ensure that...
1746 */
1747static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1748				void __user *p)
1749{
1750	struct dev_state *ps = file->private_data;
1751	struct inode *inode = file->f_path.dentry->d_inode;
1752	struct usb_device *dev = ps->dev;
1753	int ret = -ENOTTY;
1754
1755	if (!(file->f_mode & FMODE_WRITE))
1756		return -EPERM;
1757
1758	usb_lock_device(dev);
1759	if (!connected(ps)) {
1760		usb_unlock_device(dev);
1761		return -ENODEV;
1762	}
1763
1764	switch (cmd) {
1765	case USBDEVFS_CONTROL:
1766		snoop(&dev->dev, "%s: CONTROL\n", __func__);
1767		ret = proc_control(ps, p);
1768		if (ret >= 0)
1769			inode->i_mtime = CURRENT_TIME;
1770		break;
1771
1772	case USBDEVFS_BULK:
1773		snoop(&dev->dev, "%s: BULK\n", __func__);
1774		ret = proc_bulk(ps, p);
1775		if (ret >= 0)
1776			inode->i_mtime = CURRENT_TIME;
1777		break;
1778
1779	case USBDEVFS_RESETEP:
1780		snoop(&dev->dev, "%s: RESETEP\n", __func__);
1781		ret = proc_resetep(ps, p);
1782		if (ret >= 0)
1783			inode->i_mtime = CURRENT_TIME;
1784		break;
1785
1786	case USBDEVFS_RESET:
1787		snoop(&dev->dev, "%s: RESET\n", __func__);
1788		ret = proc_resetdevice(ps);
1789		break;
1790
1791	case USBDEVFS_CLEAR_HALT:
1792		snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1793		ret = proc_clearhalt(ps, p);
1794		if (ret >= 0)
1795			inode->i_mtime = CURRENT_TIME;
1796		break;
1797
1798	case USBDEVFS_GETDRIVER:
1799		snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1800		ret = proc_getdriver(ps, p);
1801		break;
1802
1803	case USBDEVFS_CONNECTINFO:
1804		snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1805		ret = proc_connectinfo(ps, p);
1806		break;
1807
1808	case USBDEVFS_SETINTERFACE:
1809		snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1810		ret = proc_setintf(ps, p);
1811		break;
1812
1813	case USBDEVFS_SETCONFIGURATION:
1814		snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1815		ret = proc_setconfig(ps, p);
1816		break;
1817
1818	case USBDEVFS_SUBMITURB:
1819		snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1820		ret = proc_submiturb(ps, p);
1821		if (ret >= 0)
1822			inode->i_mtime = CURRENT_TIME;
1823		break;
1824
1825#ifdef CONFIG_COMPAT
1826	case USBDEVFS_CONTROL32:
1827		snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1828		ret = proc_control_compat(ps, p);
1829		if (ret >= 0)
1830			inode->i_mtime = CURRENT_TIME;
1831		break;
1832
1833	case USBDEVFS_BULK32:
1834		snoop(&dev->dev, "%s: BULK32\n", __func__);
1835		ret = proc_bulk_compat(ps, p);
1836		if (ret >= 0)
1837			inode->i_mtime = CURRENT_TIME;
1838		break;
1839
1840	case USBDEVFS_DISCSIGNAL32:
1841		snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1842		ret = proc_disconnectsignal_compat(ps, p);
1843		break;
1844
1845	case USBDEVFS_SUBMITURB32:
1846		snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1847		ret = proc_submiturb_compat(ps, p);
1848		if (ret >= 0)
1849			inode->i_mtime = CURRENT_TIME;
1850		break;
1851
1852	case USBDEVFS_REAPURB32:
1853		snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1854		ret = proc_reapurb_compat(ps, p);
1855		break;
1856
1857	case USBDEVFS_REAPURBNDELAY32:
1858		snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1859		ret = proc_reapurbnonblock_compat(ps, p);
1860		break;
1861
1862	case USBDEVFS_IOCTL32:
1863		snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1864		ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1865		break;
1866#endif
1867
1868	case USBDEVFS_DISCARDURB:
1869		snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1870		ret = proc_unlinkurb(ps, p);
1871		break;
1872
1873	case USBDEVFS_REAPURB:
1874		snoop(&dev->dev, "%s: REAPURB\n", __func__);
1875		ret = proc_reapurb(ps, p);
1876		break;
1877
1878	case USBDEVFS_REAPURBNDELAY:
1879		snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1880		ret = proc_reapurbnonblock(ps, p);
1881		break;
1882
1883	case USBDEVFS_DISCSIGNAL:
1884		snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1885		ret = proc_disconnectsignal(ps, p);
1886		break;
1887
1888	case USBDEVFS_CLAIMINTERFACE:
1889		snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1890		ret = proc_claiminterface(ps, p);
1891		break;
1892
1893	case USBDEVFS_RELEASEINTERFACE:
1894		snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1895		ret = proc_releaseinterface(ps, p);
1896		break;
1897
1898	case USBDEVFS_IOCTL:
1899		snoop(&dev->dev, "%s: IOCTL\n", __func__);
1900		ret = proc_ioctl_default(ps, p);
1901		break;
1902
1903	case USBDEVFS_CLAIM_PORT:
1904		snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1905		ret = proc_claim_port(ps, p);
1906		break;
1907
1908	case USBDEVFS_RELEASE_PORT:
1909		snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1910		ret = proc_release_port(ps, p);
1911		break;
1912	}
1913	usb_unlock_device(dev);
1914	if (ret >= 0)
1915		inode->i_atime = CURRENT_TIME;
1916	return ret;
1917}
1918
1919static long usbdev_ioctl(struct file *file, unsigned int cmd,
1920			unsigned long arg)
1921{
1922	int ret;
1923
1924	ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
1925
1926	return ret;
1927}
1928
1929#ifdef CONFIG_COMPAT
1930static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
1931			unsigned long arg)
1932{
1933	int ret;
1934
1935	ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
1936
1937	return ret;
1938}
1939#endif
1940
1941/* No kernel lock - fine */
1942static unsigned int usbdev_poll(struct file *file,
1943				struct poll_table_struct *wait)
1944{
1945	struct dev_state *ps = file->private_data;
1946	unsigned int mask = 0;
1947
1948	poll_wait(file, &ps->wait, wait);
1949	if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1950		mask |= POLLOUT | POLLWRNORM;
1951	if (!connected(ps))
1952		mask |= POLLERR | POLLHUP;
1953	return mask;
1954}
1955
1956const struct file_operations usbdev_file_operations = {
1957	.owner =	  THIS_MODULE,
1958	.llseek =	  usbdev_lseek,
1959	.read =		  usbdev_read,
1960	.poll =		  usbdev_poll,
1961	.unlocked_ioctl = usbdev_ioctl,
1962#ifdef CONFIG_COMPAT
1963	.compat_ioctl =   usbdev_compat_ioctl,
1964#endif
1965	.open =		  usbdev_open,
1966	.release =	  usbdev_release,
1967};
1968
1969static void usbdev_remove(struct usb_device *udev)
1970{
1971	struct dev_state *ps;
1972	struct siginfo sinfo;
1973
1974	while (!list_empty(&udev->filelist)) {
1975		ps = list_entry(udev->filelist.next, struct dev_state, list);
1976		destroy_all_async(ps);
1977		wake_up_all(&ps->wait);
1978		list_del_init(&ps->list);
1979		if (ps->discsignr) {
1980			sinfo.si_signo = ps->discsignr;
1981			sinfo.si_errno = EPIPE;
1982			sinfo.si_code = SI_ASYNCIO;
1983			sinfo.si_addr = ps->disccontext;
1984			kill_pid_info_as_uid(ps->discsignr, &sinfo,
1985					ps->disc_pid, ps->disc_uid,
1986					ps->disc_euid, ps->secid);
1987		}
1988	}
1989}
1990
1991#ifdef CONFIG_USB_DEVICE_CLASS
1992static struct class *usb_classdev_class;
1993
1994static int usb_classdev_add(struct usb_device *dev)
1995{
1996	struct device *cldev;
1997
1998	cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1999			      NULL, "usbdev%d.%d", dev->bus->busnum,
2000			      dev->devnum);
2001	if (IS_ERR(cldev))
2002		return PTR_ERR(cldev);
2003	dev->usb_classdev = cldev;
2004	return 0;
2005}
2006
2007static void usb_classdev_remove(struct usb_device *dev)
2008{
2009	if (dev->usb_classdev)
2010		device_unregister(dev->usb_classdev);
2011}
2012
2013#else
2014#define usb_classdev_add(dev)		0
2015#define usb_classdev_remove(dev)	do {} while (0)
2016
2017#endif
2018
2019static int usbdev_notify(struct notifier_block *self,
2020			       unsigned long action, void *dev)
2021{
2022	switch (action) {
2023	case USB_DEVICE_ADD:
2024		if (usb_classdev_add(dev))
2025			return NOTIFY_BAD;
2026		break;
2027	case USB_DEVICE_REMOVE:
2028		usb_classdev_remove(dev);
2029		usbdev_remove(dev);
2030		break;
2031	}
2032	return NOTIFY_OK;
2033}
2034
2035static struct notifier_block usbdev_nb = {
2036	.notifier_call = 	usbdev_notify,
2037};
2038
2039static struct cdev usb_device_cdev;
2040
2041int __init usb_devio_init(void)
2042{
2043	int retval;
2044
2045	retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2046					"usb_device");
2047	if (retval) {
2048		printk(KERN_ERR "Unable to register minors for usb_device\n");
2049		goto out;
2050	}
2051	cdev_init(&usb_device_cdev, &usbdev_file_operations);
2052	retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2053	if (retval) {
2054		printk(KERN_ERR "Unable to get usb_device major %d\n",
2055		       USB_DEVICE_MAJOR);
2056		goto error_cdev;
2057	}
2058#ifdef CONFIG_USB_DEVICE_CLASS
2059	usb_classdev_class = class_create(THIS_MODULE, "usb_device");
2060	if (IS_ERR(usb_classdev_class)) {
2061		printk(KERN_ERR "Unable to register usb_device class\n");
2062		retval = PTR_ERR(usb_classdev_class);
2063		cdev_del(&usb_device_cdev);
2064		usb_classdev_class = NULL;
2065		goto out;
2066	}
2067	/* devices of this class shadow the major:minor of their parent
2068	 * device, so clear ->dev_kobj to prevent adding duplicate entries
2069	 * to /sys/dev
2070	 */
2071	usb_classdev_class->dev_kobj = NULL;
2072#endif
2073	usb_register_notify(&usbdev_nb);
2074out:
2075	return retval;
2076
2077error_cdev:
2078	unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2079	goto out;
2080}
2081
2082void usb_devio_cleanup(void)
2083{
2084	usb_unregister_notify(&usbdev_nb);
2085#ifdef CONFIG_USB_DEVICE_CLASS
2086	class_destroy(usb_classdev_class);
2087#endif
2088	cdev_del(&usb_device_cdev);
2089	unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2090}