1 /*****************************************************************************/
4 * devio.c -- User space communication with USB devices.
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
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.
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.
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.
22 * This file implements the usbfs/x/y files, where
23 * x is the bus number and y the device number.
25 * It allows user space programs/"drivers" to communicate directly
26 * with USB devices without intervening kernel driver.
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
35 /*****************************************************************************/
39 #include <linux/slab.h>
40 #include <linux/signal.h>
41 #include <linux/poll.h>
42 #include <linux/module.h>
43 #include <linux/string.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/usb/hcd.h> /* for usbcore internals */
47 #include <linux/cdev.h>
48 #include <linux/notifier.h>
49 #include <linux/security.h>
50 #include <linux/user_namespace.h>
51 #include <linux/scatterlist.h>
52 #include <linux/uaccess.h>
53 #include <asm/byteorder.h>
54 #include <linux/moduleparam.h>
59 #define USB_DEVICE_MAX (USB_MAXBUS * 128)
60 #define USB_SG_SIZE 16384 /* split-size for large txs */
62 /* Mutual exclusion for removal, open, and release */
63 DEFINE_MUTEX(usbfs_mutex);
65 struct usb_dev_state {
66 struct list_head list; /* state list */
67 struct usb_device *dev;
69 spinlock_t lock; /* protects the async urb lists */
70 struct list_head async_pending;
71 struct list_head async_completed;
72 wait_queue_head_t wait; /* wake up if a request completed */
73 unsigned int discsignr;
75 const struct cred *cred;
76 void __user *disccontext;
77 unsigned long ifclaimed;
79 u32 disabled_bulk_eps;
83 struct list_head asynclist;
84 struct usb_dev_state *ps;
86 const struct cred *cred;
89 void __user *userbuffer;
92 unsigned int mem_usage;
99 static bool usbfs_snoop;
100 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
101 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
103 #define snoop(dev, format, arg...) \
106 dev_info(dev, format, ## arg); \
113 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
115 /* Limit on the total amount of memory we can allocate for transfers */
116 static unsigned usbfs_memory_mb = 16;
117 module_param(usbfs_memory_mb, uint, 0644);
118 MODULE_PARM_DESC(usbfs_memory_mb,
119 "maximum MB allowed for usbfs buffers (0 = no limit)");
121 /* Hard limit, necessary to avoid arithmetic overflow */
122 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
124 static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
126 /* Check whether it's okay to allocate more memory for a transfer */
127 static int usbfs_increase_memory_usage(unsigned amount)
132 * Convert usbfs_memory_mb to bytes, avoiding overflows.
133 * 0 means use the hard limit (effectively unlimited).
135 lim = ACCESS_ONCE(usbfs_memory_mb);
136 if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
137 lim = USBFS_XFER_MAX;
141 atomic_add(amount, &usbfs_memory_usage);
142 if (atomic_read(&usbfs_memory_usage) <= lim)
144 atomic_sub(amount, &usbfs_memory_usage);
148 /* Memory for a transfer is being deallocated */
149 static void usbfs_decrease_memory_usage(unsigned amount)
151 atomic_sub(amount, &usbfs_memory_usage);
154 static int connected(struct usb_dev_state *ps)
156 return (!list_empty(&ps->list) &&
157 ps->dev->state != USB_STATE_NOTATTACHED);
160 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
164 mutex_lock(&file_inode(file)->i_mutex);
168 file->f_pos = offset;
172 file->f_pos += offset;
180 mutex_unlock(&file_inode(file)->i_mutex);
184 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
187 struct usb_dev_state *ps = file->private_data;
188 struct usb_device *dev = ps->dev;
195 usb_lock_device(dev);
196 if (!connected(ps)) {
199 } else if (pos < 0) {
204 if (pos < sizeof(struct usb_device_descriptor)) {
205 /* 18 bytes - fits on the stack */
206 struct usb_device_descriptor temp_desc;
208 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
209 le16_to_cpus(&temp_desc.bcdUSB);
210 le16_to_cpus(&temp_desc.idVendor);
211 le16_to_cpus(&temp_desc.idProduct);
212 le16_to_cpus(&temp_desc.bcdDevice);
214 len = sizeof(struct usb_device_descriptor) - pos;
217 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
228 pos = sizeof(struct usb_device_descriptor);
229 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
230 struct usb_config_descriptor *config =
231 (struct usb_config_descriptor *)dev->rawdescriptors[i];
232 unsigned int length = le16_to_cpu(config->wTotalLength);
234 if (*ppos < pos + length) {
236 /* The descriptor may claim to be longer than it
237 * really is. Here is the actual allocated length. */
239 le16_to_cpu(dev->config[i].desc.wTotalLength);
241 len = length - (*ppos - pos);
245 /* Simply don't write (skip over) unallocated parts */
246 if (alloclen > (*ppos - pos)) {
247 alloclen -= (*ppos - pos);
248 if (copy_to_user(buf,
249 dev->rawdescriptors[i] + (*ppos - pos),
250 min(len, alloclen))) {
266 usb_unlock_device(dev);
271 * async list handling
274 static struct async *alloc_async(unsigned int numisoframes)
278 as = kzalloc(sizeof(struct async), GFP_KERNEL);
281 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
289 static void free_async(struct async *as)
296 for (i = 0; i < as->urb->num_sgs; i++) {
297 if (sg_page(&as->urb->sg[i]))
298 kfree(sg_virt(&as->urb->sg[i]));
301 kfree(as->urb->transfer_buffer);
302 kfree(as->urb->setup_packet);
303 usb_free_urb(as->urb);
304 usbfs_decrease_memory_usage(as->mem_usage);
308 static void async_newpending(struct async *as)
310 struct usb_dev_state *ps = as->ps;
313 spin_lock_irqsave(&ps->lock, flags);
314 list_add_tail(&as->asynclist, &ps->async_pending);
315 spin_unlock_irqrestore(&ps->lock, flags);
318 static void async_removepending(struct async *as)
320 struct usb_dev_state *ps = as->ps;
323 spin_lock_irqsave(&ps->lock, flags);
324 list_del_init(&as->asynclist);
325 spin_unlock_irqrestore(&ps->lock, flags);
328 static struct async *async_getcompleted(struct usb_dev_state *ps)
331 struct async *as = NULL;
333 spin_lock_irqsave(&ps->lock, flags);
334 if (!list_empty(&ps->async_completed)) {
335 as = list_entry(ps->async_completed.next, struct async,
337 list_del_init(&as->asynclist);
339 spin_unlock_irqrestore(&ps->lock, flags);
343 static struct async *async_getpending(struct usb_dev_state *ps,
344 void __user *userurb)
348 list_for_each_entry(as, &ps->async_pending, asynclist)
349 if (as->userurb == userurb) {
350 list_del_init(&as->asynclist);
357 static void snoop_urb(struct usb_device *udev,
358 void __user *userurb, int pipe, unsigned length,
359 int timeout_or_status, enum snoop_when when,
360 unsigned char *data, unsigned data_len)
362 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
363 static const char *dirs[] = {"out", "in"};
370 ep = usb_pipeendpoint(pipe);
371 t = types[usb_pipetype(pipe)];
372 d = dirs[!!usb_pipein(pipe)];
374 if (userurb) { /* Async */
376 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
378 userurb, ep, t, d, length);
380 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
381 "actual_length %u status %d\n",
382 userurb, ep, t, d, length,
386 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
388 ep, t, d, length, timeout_or_status);
390 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
392 ep, t, d, length, timeout_or_status);
395 if (data && data_len > 0) {
396 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
401 static void snoop_urb_data(struct urb *urb, unsigned len)
408 if (urb->num_sgs == 0) {
409 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
410 urb->transfer_buffer, len, 1);
414 for (i = 0; i < urb->num_sgs && len; i++) {
415 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
416 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
417 sg_virt(&urb->sg[i]), size, 1);
422 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
424 unsigned i, len, size;
426 if (urb->number_of_packets > 0) /* Isochronous */
427 len = urb->transfer_buffer_length;
429 len = urb->actual_length;
431 if (urb->num_sgs == 0) {
432 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
437 for (i = 0; i < urb->num_sgs && len; i++) {
438 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
439 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
448 #define AS_CONTINUATION 1
451 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
458 /* Mark all the pending URBs that match bulk_addr, up to but not
459 * including the first one without AS_CONTINUATION. If such an
460 * URB is encountered then a new transfer has already started so
461 * the endpoint doesn't need to be disabled; otherwise it does.
463 list_for_each_entry(as, &ps->async_pending, asynclist) {
464 if (as->bulk_addr == bulk_addr) {
465 if (as->bulk_status != AS_CONTINUATION)
467 as->bulk_status = AS_UNLINK;
471 ps->disabled_bulk_eps |= (1 << bulk_addr);
473 /* Now carefully unlink all the marked pending URBs */
475 list_for_each_entry(as, &ps->async_pending, asynclist) {
476 if (as->bulk_status == AS_UNLINK) {
477 as->bulk_status = 0; /* Only once */
480 spin_unlock(&ps->lock); /* Allow completions */
483 spin_lock(&ps->lock);
489 static void async_completed(struct urb *urb)
491 struct async *as = urb->context;
492 struct usb_dev_state *ps = as->ps;
493 struct siginfo sinfo;
494 struct pid *pid = NULL;
496 const struct cred *cred = NULL;
499 spin_lock(&ps->lock);
500 list_move_tail(&as->asynclist, &ps->async_completed);
501 as->status = urb->status;
504 memset(&sinfo, 0, sizeof(sinfo));
505 sinfo.si_signo = as->signr;
506 sinfo.si_errno = as->status;
507 sinfo.si_code = SI_ASYNCIO;
508 sinfo.si_addr = as->userurb;
509 pid = get_pid(as->pid);
510 cred = get_cred(as->cred);
513 snoop(&urb->dev->dev, "urb complete\n");
514 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
515 as->status, COMPLETE, NULL, 0);
516 if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
517 snoop_urb_data(urb, urb->actual_length);
519 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
520 as->status != -ENOENT)
521 cancel_bulk_urbs(ps, as->bulk_addr);
522 spin_unlock(&ps->lock);
525 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
533 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
539 spin_lock_irqsave(&ps->lock, flags);
540 while (!list_empty(list)) {
541 as = list_entry(list->next, struct async, asynclist);
542 list_del_init(&as->asynclist);
546 /* drop the spinlock so the completion handler can run */
547 spin_unlock_irqrestore(&ps->lock, flags);
550 spin_lock_irqsave(&ps->lock, flags);
552 spin_unlock_irqrestore(&ps->lock, flags);
555 static void destroy_async_on_interface(struct usb_dev_state *ps,
558 struct list_head *p, *q, hitlist;
561 INIT_LIST_HEAD(&hitlist);
562 spin_lock_irqsave(&ps->lock, flags);
563 list_for_each_safe(p, q, &ps->async_pending)
564 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
565 list_move_tail(p, &hitlist);
566 spin_unlock_irqrestore(&ps->lock, flags);
567 destroy_async(ps, &hitlist);
570 static void destroy_all_async(struct usb_dev_state *ps)
572 destroy_async(ps, &ps->async_pending);
576 * interface claims are made only at the request of user level code,
577 * which can also release them (explicitly or by closing files).
578 * they're also undone when devices disconnect.
581 static int driver_probe(struct usb_interface *intf,
582 const struct usb_device_id *id)
587 static void driver_disconnect(struct usb_interface *intf)
589 struct usb_dev_state *ps = usb_get_intfdata(intf);
590 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
595 /* NOTE: this relies on usbcore having canceled and completed
596 * all pending I/O requests; 2.6 does that.
599 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
600 clear_bit(ifnum, &ps->ifclaimed);
602 dev_warn(&intf->dev, "interface number %u out of range\n",
605 usb_set_intfdata(intf, NULL);
607 /* force async requests to complete */
608 destroy_async_on_interface(ps, ifnum);
611 /* The following routines are merely placeholders. There is no way
612 * to inform a user task about suspend or resumes.
614 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
619 static int driver_resume(struct usb_interface *intf)
624 struct usb_driver usbfs_driver = {
626 .probe = driver_probe,
627 .disconnect = driver_disconnect,
628 .suspend = driver_suspend,
629 .resume = driver_resume,
632 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
634 struct usb_device *dev = ps->dev;
635 struct usb_interface *intf;
638 if (ifnum >= 8*sizeof(ps->ifclaimed))
640 /* already claimed */
641 if (test_bit(ifnum, &ps->ifclaimed))
644 intf = usb_ifnum_to_if(dev, ifnum);
648 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
650 set_bit(ifnum, &ps->ifclaimed);
654 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
656 struct usb_device *dev;
657 struct usb_interface *intf;
661 if (ifnum >= 8*sizeof(ps->ifclaimed))
664 intf = usb_ifnum_to_if(dev, ifnum);
667 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
668 usb_driver_release_interface(&usbfs_driver, intf);
674 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
676 if (ps->dev->state != USB_STATE_CONFIGURED)
677 return -EHOSTUNREACH;
678 if (ifnum >= 8*sizeof(ps->ifclaimed))
680 if (test_bit(ifnum, &ps->ifclaimed))
682 /* if not yet claimed, claim it for the driver */
683 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
684 "interface %u before use\n", task_pid_nr(current),
685 current->comm, ifnum);
686 return claimintf(ps, ifnum);
689 static int findintfep(struct usb_device *dev, unsigned int ep)
691 unsigned int i, j, e;
692 struct usb_interface *intf;
693 struct usb_host_interface *alts;
694 struct usb_endpoint_descriptor *endpt;
696 if (ep & ~(USB_DIR_IN|0xf))
700 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
701 intf = dev->actconfig->interface[i];
702 for (j = 0; j < intf->num_altsetting; j++) {
703 alts = &intf->altsetting[j];
704 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
705 endpt = &alts->endpoint[e].desc;
706 if (endpt->bEndpointAddress == ep)
707 return alts->desc.bInterfaceNumber;
714 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
715 unsigned int request, unsigned int index)
718 struct usb_host_interface *alt_setting;
720 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
721 && ps->dev->state != USB_STATE_ADDRESS
722 && ps->dev->state != USB_STATE_CONFIGURED)
723 return -EHOSTUNREACH;
724 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
728 * check for the special corner case 'get_device_id' in the printer
729 * class specification, which we always want to allow as it is used
730 * to query things like ink level, etc.
732 if (requesttype == 0xa1 && request == 0) {
733 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
734 index >> 8, index & 0xff);
736 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
741 switch (requesttype & USB_RECIP_MASK) {
742 case USB_RECIP_ENDPOINT:
743 if ((index & ~USB_DIR_IN) == 0)
745 ret = findintfep(ps->dev, index);
748 * Some not fully compliant Win apps seem to get
749 * index wrong and have the endpoint number here
750 * rather than the endpoint address (with the
751 * correct direction). Win does let this through,
752 * so we'll not reject it here but leave it to
753 * the device to not break KVM. But we warn.
755 ret = findintfep(ps->dev, index ^ 0x80);
757 dev_info(&ps->dev->dev,
758 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
759 __func__, task_pid_nr(current),
760 current->comm, index, index ^ 0x80);
763 ret = checkintf(ps, ret);
766 case USB_RECIP_INTERFACE:
767 ret = checkintf(ps, index);
773 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
776 if (ep & USB_ENDPOINT_DIR_MASK)
777 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
779 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
782 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
783 struct usbdevfs_streams __user *streams,
784 unsigned int *num_streams_ret,
785 unsigned int *num_eps_ret,
786 struct usb_host_endpoint ***eps_ret,
787 struct usb_interface **intf_ret)
789 unsigned int i, num_streams, num_eps;
790 struct usb_host_endpoint **eps;
791 struct usb_interface *intf = NULL;
795 if (get_user(num_streams, &streams->num_streams) ||
796 get_user(num_eps, &streams->num_eps))
799 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
802 /* The XHCI controller allows max 2 ^ 16 streams */
803 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
806 eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
810 for (i = 0; i < num_eps; i++) {
811 if (get_user(ep, &streams->eps[i])) {
815 eps[i] = ep_to_host_endpoint(ps->dev, ep);
821 /* usb_alloc/free_streams operate on an usb_interface */
822 ifnum = findintfep(ps->dev, ep);
829 ret = checkintf(ps, ifnum);
832 intf = usb_ifnum_to_if(ps->dev, ifnum);
834 /* Verify all eps belong to the same interface */
835 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
843 *num_streams_ret = num_streams;
844 *num_eps_ret = num_eps;
855 static int match_devt(struct device *dev, void *data)
857 return dev->devt == (dev_t) (unsigned long) data;
860 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
864 dev = bus_find_device(&usb_bus_type, NULL,
865 (void *) (unsigned long) devt, match_devt);
868 return container_of(dev, struct usb_device, dev);
874 static int usbdev_open(struct inode *inode, struct file *file)
876 struct usb_device *dev = NULL;
877 struct usb_dev_state *ps;
881 ps = kmalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
887 /* Protect against simultaneous removal or release */
888 mutex_lock(&usbfs_mutex);
890 /* usbdev device-node */
891 if (imajor(inode) == USB_DEVICE_MAJOR)
892 dev = usbdev_lookup_by_devt(inode->i_rdev);
894 mutex_unlock(&usbfs_mutex);
899 usb_lock_device(dev);
900 if (dev->state == USB_STATE_NOTATTACHED)
901 goto out_unlock_device;
903 ret = usb_autoresume_device(dev);
905 goto out_unlock_device;
909 spin_lock_init(&ps->lock);
910 INIT_LIST_HEAD(&ps->list);
911 INIT_LIST_HEAD(&ps->async_pending);
912 INIT_LIST_HEAD(&ps->async_completed);
913 init_waitqueue_head(&ps->wait);
915 ps->disc_pid = get_pid(task_pid(current));
916 ps->cred = get_current_cred();
917 ps->disccontext = NULL;
919 security_task_getsecid(current, &ps->secid);
921 list_add_tail(&ps->list, &dev->filelist);
922 file->private_data = ps;
923 usb_unlock_device(dev);
924 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
929 usb_unlock_device(dev);
936 static int usbdev_release(struct inode *inode, struct file *file)
938 struct usb_dev_state *ps = file->private_data;
939 struct usb_device *dev = ps->dev;
943 usb_lock_device(dev);
944 usb_hub_release_all_ports(dev, ps);
946 list_del_init(&ps->list);
948 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
950 if (test_bit(ifnum, &ps->ifclaimed))
951 releaseintf(ps, ifnum);
953 destroy_all_async(ps);
954 usb_autosuspend_device(dev);
955 usb_unlock_device(dev);
957 put_pid(ps->disc_pid);
960 as = async_getcompleted(ps);
963 as = async_getcompleted(ps);
969 static int proc_control(struct usb_dev_state *ps, void __user *arg)
971 struct usb_device *dev = ps->dev;
972 struct usbdevfs_ctrltransfer ctrl;
978 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
980 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
984 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
985 if (wLength > PAGE_SIZE)
987 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
988 sizeof(struct usb_ctrlrequest));
991 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
997 snoop(&dev->dev, "control urb: bRequestType=%02x "
998 "bRequest=%02x wValue=%04x "
999 "wIndex=%04x wLength=%04x\n",
1000 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1001 ctrl.wIndex, ctrl.wLength);
1002 if (ctrl.bRequestType & 0x80) {
1003 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1008 pipe = usb_rcvctrlpipe(dev, 0);
1009 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1011 usb_unlock_device(dev);
1012 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1013 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1014 tbuf, ctrl.wLength, tmo);
1015 usb_lock_device(dev);
1016 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1018 if ((i > 0) && ctrl.wLength) {
1019 if (copy_to_user(ctrl.data, tbuf, i)) {
1026 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1031 pipe = usb_sndctrlpipe(dev, 0);
1032 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1033 tbuf, ctrl.wLength);
1035 usb_unlock_device(dev);
1036 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1037 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1038 tbuf, ctrl.wLength, tmo);
1039 usb_lock_device(dev);
1040 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1042 if (i < 0 && i != -EPIPE) {
1043 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1044 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1045 current->comm, ctrl.bRequestType, ctrl.bRequest,
1050 free_page((unsigned long) tbuf);
1051 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1052 sizeof(struct usb_ctrlrequest));
1056 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1058 struct usb_device *dev = ps->dev;
1059 struct usbdevfs_bulktransfer bulk;
1060 unsigned int tmo, len1, pipe;
1062 unsigned char *tbuf;
1065 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1067 ret = findintfep(ps->dev, bulk.ep);
1070 ret = checkintf(ps, ret);
1073 if (bulk.ep & USB_DIR_IN)
1074 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1076 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1077 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1080 if (len1 >= USBFS_XFER_MAX)
1082 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1085 tbuf = kmalloc(len1, GFP_KERNEL);
1091 if (bulk.ep & 0x80) {
1092 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1096 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1098 usb_unlock_device(dev);
1099 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1100 usb_lock_device(dev);
1101 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1104 if (copy_to_user(bulk.data, tbuf, len2)) {
1111 if (copy_from_user(tbuf, bulk.data, len1)) {
1116 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1118 usb_unlock_device(dev);
1119 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1120 usb_lock_device(dev);
1121 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1123 ret = (i < 0 ? i : len2);
1126 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1130 static void check_reset_of_active_ep(struct usb_device *udev,
1131 unsigned int epnum, char *ioctl_name)
1133 struct usb_host_endpoint **eps;
1134 struct usb_host_endpoint *ep;
1136 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1137 ep = eps[epnum & 0x0f];
1138 if (ep && !list_empty(&ep->urb_list))
1139 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1140 task_pid_nr(current), current->comm,
1144 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1149 if (get_user(ep, (unsigned int __user *)arg))
1151 ret = findintfep(ps->dev, ep);
1154 ret = checkintf(ps, ret);
1157 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1158 usb_reset_endpoint(ps->dev, ep);
1162 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1168 if (get_user(ep, (unsigned int __user *)arg))
1170 ret = findintfep(ps->dev, ep);
1173 ret = checkintf(ps, ret);
1176 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1177 if (ep & USB_DIR_IN)
1178 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1180 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1182 return usb_clear_halt(ps->dev, pipe);
1185 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1187 struct usbdevfs_getdriver gd;
1188 struct usb_interface *intf;
1191 if (copy_from_user(&gd, arg, sizeof(gd)))
1193 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1194 if (!intf || !intf->dev.driver)
1197 strlcpy(gd.driver, intf->dev.driver->name,
1199 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1204 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1206 struct usbdevfs_connectinfo ci;
1208 memset(&ci, 0, sizeof(ci));
1209 ci.devnum = ps->dev->devnum;
1210 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1212 if (copy_to_user(arg, &ci, sizeof(ci)))
1217 static int proc_resetdevice(struct usb_dev_state *ps)
1219 return usb_reset_device(ps->dev);
1222 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1224 struct usbdevfs_setinterface setintf;
1227 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1229 ret = checkintf(ps, setintf.interface);
1233 destroy_async_on_interface(ps, setintf.interface);
1235 return usb_set_interface(ps->dev, setintf.interface,
1236 setintf.altsetting);
1239 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1243 struct usb_host_config *actconfig;
1245 if (get_user(u, (int __user *)arg))
1248 actconfig = ps->dev->actconfig;
1250 /* Don't touch the device if any interfaces are claimed.
1251 * It could interfere with other drivers' operations, and if
1252 * an interface is claimed by usbfs it could easily deadlock.
1257 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1258 if (usb_interface_claimed(actconfig->interface[i])) {
1259 dev_warn(&ps->dev->dev,
1260 "usbfs: interface %d claimed by %s "
1261 "while '%s' sets config #%d\n",
1262 actconfig->interface[i]
1264 ->desc.bInterfaceNumber,
1265 actconfig->interface[i]
1274 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1275 * so avoid usb_set_configuration()'s kick to sysfs
1278 if (actconfig && actconfig->desc.bConfigurationValue == u)
1279 status = usb_reset_configuration(ps->dev);
1281 status = usb_set_configuration(ps->dev, u);
1287 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1288 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1291 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1292 struct usb_host_endpoint *ep;
1293 struct async *as = NULL;
1294 struct usb_ctrlrequest *dr = NULL;
1295 unsigned int u, totlen, isofrmlen;
1296 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1297 int number_of_packets = 0;
1298 unsigned int stream_id = 0;
1301 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1302 USBDEVFS_URB_SHORT_NOT_OK |
1303 USBDEVFS_URB_BULK_CONTINUATION |
1304 USBDEVFS_URB_NO_FSBR |
1305 USBDEVFS_URB_ZERO_PACKET |
1306 USBDEVFS_URB_NO_INTERRUPT))
1308 if (uurb->buffer_length > 0 && !uurb->buffer)
1310 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1311 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1312 ifnum = findintfep(ps->dev, uurb->endpoint);
1315 ret = checkintf(ps, ifnum);
1319 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1322 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1325 switch (uurb->type) {
1326 case USBDEVFS_URB_TYPE_CONTROL:
1327 if (!usb_endpoint_xfer_control(&ep->desc))
1329 /* min 8 byte setup packet */
1330 if (uurb->buffer_length < 8)
1332 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1335 if (copy_from_user(dr, uurb->buffer, 8)) {
1339 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1343 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1344 le16_to_cpup(&dr->wIndex));
1347 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1349 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1351 uurb->endpoint |= USB_DIR_IN;
1354 uurb->endpoint &= ~USB_DIR_IN;
1356 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1357 "bRequest=%02x wValue=%04x "
1358 "wIndex=%04x wLength=%04x\n",
1359 dr->bRequestType, dr->bRequest,
1360 __le16_to_cpup(&dr->wValue),
1361 __le16_to_cpup(&dr->wIndex),
1362 __le16_to_cpup(&dr->wLength));
1363 u = sizeof(struct usb_ctrlrequest);
1366 case USBDEVFS_URB_TYPE_BULK:
1367 switch (usb_endpoint_type(&ep->desc)) {
1368 case USB_ENDPOINT_XFER_CONTROL:
1369 case USB_ENDPOINT_XFER_ISOC:
1371 case USB_ENDPOINT_XFER_INT:
1372 /* allow single-shot interrupt transfers */
1373 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1376 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1377 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1380 stream_id = uurb->stream_id;
1383 case USBDEVFS_URB_TYPE_INTERRUPT:
1384 if (!usb_endpoint_xfer_int(&ep->desc))
1389 case USBDEVFS_URB_TYPE_ISO:
1390 /* arbitrary limit */
1391 if (uurb->number_of_packets < 1 ||
1392 uurb->number_of_packets > 128)
1394 if (!usb_endpoint_xfer_isoc(&ep->desc))
1396 number_of_packets = uurb->number_of_packets;
1397 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1399 isopkt = kmalloc(isofrmlen, GFP_KERNEL);
1402 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1406 for (totlen = u = 0; u < number_of_packets; u++) {
1408 * arbitrary limit need for USB 3.0
1409 * bMaxBurst (0~15 allowed, 1~16 packets)
1410 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1411 * sizemax: 1024 * 16 * 3 = 49152
1413 if (isopkt[u].length > 49152) {
1417 totlen += isopkt[u].length;
1419 u *= sizeof(struct usb_iso_packet_descriptor);
1420 uurb->buffer_length = totlen;
1427 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1431 if (uurb->buffer_length > 0 &&
1432 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1433 uurb->buffer, uurb->buffer_length)) {
1437 as = alloc_async(number_of_packets);
1443 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1444 num_sgs * sizeof(struct scatterlist);
1445 ret = usbfs_increase_memory_usage(u);
1451 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1457 as->urb->num_sgs = num_sgs;
1458 sg_init_table(as->urb->sg, as->urb->num_sgs);
1460 totlen = uurb->buffer_length;
1461 for (i = 0; i < as->urb->num_sgs; i++) {
1462 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1463 buf = kmalloc(u, GFP_KERNEL);
1468 sg_set_buf(&as->urb->sg[i], buf, u);
1471 if (copy_from_user(buf, uurb->buffer, u)) {
1479 } else if (uurb->buffer_length > 0) {
1480 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1482 if (!as->urb->transfer_buffer) {
1488 if (copy_from_user(as->urb->transfer_buffer,
1490 uurb->buffer_length)) {
1494 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1496 * Isochronous input data may end up being
1497 * discontiguous if some of the packets are short.
1498 * Clear the buffer so that the gaps don't leak
1499 * kernel data to userspace.
1501 memset(as->urb->transfer_buffer, 0,
1502 uurb->buffer_length);
1505 as->urb->dev = ps->dev;
1506 as->urb->pipe = (uurb->type << 30) |
1507 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1508 (uurb->endpoint & USB_DIR_IN);
1510 /* This tedious sequence is necessary because the URB_* flags
1511 * are internal to the kernel and subject to change, whereas
1512 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1514 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1515 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1517 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1518 u |= URB_SHORT_NOT_OK;
1519 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1521 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1522 u |= URB_ZERO_PACKET;
1523 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1524 u |= URB_NO_INTERRUPT;
1525 as->urb->transfer_flags = u;
1527 as->urb->transfer_buffer_length = uurb->buffer_length;
1528 as->urb->setup_packet = (unsigned char *)dr;
1530 as->urb->start_frame = uurb->start_frame;
1531 as->urb->number_of_packets = number_of_packets;
1532 as->urb->stream_id = stream_id;
1534 if (ep->desc.bInterval) {
1535 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1536 ps->dev->speed == USB_SPEED_HIGH ||
1537 ps->dev->speed >= USB_SPEED_SUPER)
1538 as->urb->interval = 1 <<
1539 min(15, ep->desc.bInterval - 1);
1541 as->urb->interval = ep->desc.bInterval;
1544 as->urb->context = as;
1545 as->urb->complete = async_completed;
1546 for (totlen = u = 0; u < number_of_packets; u++) {
1547 as->urb->iso_frame_desc[u].offset = totlen;
1548 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1549 totlen += isopkt[u].length;
1555 if (is_in && uurb->buffer_length > 0)
1556 as->userbuffer = uurb->buffer;
1558 as->userbuffer = NULL;
1559 as->signr = uurb->signr;
1561 as->pid = get_pid(task_pid(current));
1562 as->cred = get_current_cred();
1563 security_task_getsecid(current, &as->secid);
1564 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1565 as->urb->transfer_buffer_length, 0, SUBMIT,
1568 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1570 async_newpending(as);
1572 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1573 spin_lock_irq(&ps->lock);
1575 /* Not exactly the endpoint address; the direction bit is
1576 * shifted to the 0x10 position so that the value will be
1579 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1580 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1583 /* If this bulk URB is the start of a new transfer, re-enable
1584 * the endpoint. Otherwise mark it as a continuation URB.
1586 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1587 as->bulk_status = AS_CONTINUATION;
1589 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1591 /* Don't accept continuation URBs if the endpoint is
1592 * disabled because of an earlier error.
1594 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1597 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1598 spin_unlock_irq(&ps->lock);
1600 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1604 dev_printk(KERN_DEBUG, &ps->dev->dev,
1605 "usbfs: usb_submit_urb returned %d\n", ret);
1606 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1607 0, ret, COMPLETE, NULL, 0);
1608 async_removepending(as);
1621 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1623 struct usbdevfs_urb uurb;
1625 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1628 return proc_do_submiturb(ps, &uurb,
1629 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1633 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1637 unsigned long flags;
1639 spin_lock_irqsave(&ps->lock, flags);
1640 as = async_getpending(ps, arg);
1642 spin_unlock_irqrestore(&ps->lock, flags);
1648 spin_unlock_irqrestore(&ps->lock, flags);
1656 static int processcompl(struct async *as, void __user * __user *arg)
1658 struct urb *urb = as->urb;
1659 struct usbdevfs_urb __user *userurb = as->userurb;
1660 void __user *addr = as->userurb;
1663 if (as->userbuffer && urb->actual_length) {
1664 if (copy_urb_data_to_user(as->userbuffer, urb))
1667 if (put_user(as->status, &userurb->status))
1669 if (put_user(urb->actual_length, &userurb->actual_length))
1671 if (put_user(urb->error_count, &userurb->error_count))
1674 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1675 for (i = 0; i < urb->number_of_packets; i++) {
1676 if (put_user(urb->iso_frame_desc[i].actual_length,
1677 &userurb->iso_frame_desc[i].actual_length))
1679 if (put_user(urb->iso_frame_desc[i].status,
1680 &userurb->iso_frame_desc[i].status))
1685 if (put_user(addr, (void __user * __user *)arg))
1693 static struct async *reap_as(struct usb_dev_state *ps)
1695 DECLARE_WAITQUEUE(wait, current);
1696 struct async *as = NULL;
1697 struct usb_device *dev = ps->dev;
1699 add_wait_queue(&ps->wait, &wait);
1701 __set_current_state(TASK_INTERRUPTIBLE);
1702 as = async_getcompleted(ps);
1703 if (as || !connected(ps))
1705 if (signal_pending(current))
1707 usb_unlock_device(dev);
1709 usb_lock_device(dev);
1711 remove_wait_queue(&ps->wait, &wait);
1712 set_current_state(TASK_RUNNING);
1716 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1718 struct async *as = reap_as(ps);
1720 int retval = processcompl(as, (void __user * __user *)arg);
1724 if (signal_pending(current))
1729 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1734 as = async_getcompleted(ps);
1736 retval = processcompl(as, (void __user * __user *)arg);
1739 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1744 #ifdef CONFIG_COMPAT
1745 static int proc_control_compat(struct usb_dev_state *ps,
1746 struct usbdevfs_ctrltransfer32 __user *p32)
1748 struct usbdevfs_ctrltransfer __user *p;
1750 p = compat_alloc_user_space(sizeof(*p));
1751 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1752 get_user(udata, &p32->data) ||
1753 put_user(compat_ptr(udata), &p->data))
1755 return proc_control(ps, p);
1758 static int proc_bulk_compat(struct usb_dev_state *ps,
1759 struct usbdevfs_bulktransfer32 __user *p32)
1761 struct usbdevfs_bulktransfer __user *p;
1763 compat_caddr_t addr;
1765 p = compat_alloc_user_space(sizeof(*p));
1767 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1768 get_user(n, &p32->len) || put_user(n, &p->len) ||
1769 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1770 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1773 return proc_bulk(ps, p);
1775 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1777 struct usbdevfs_disconnectsignal32 ds;
1779 if (copy_from_user(&ds, arg, sizeof(ds)))
1781 ps->discsignr = ds.signr;
1782 ps->disccontext = compat_ptr(ds.context);
1786 static int get_urb32(struct usbdevfs_urb *kurb,
1787 struct usbdevfs_urb32 __user *uurb)
1790 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1791 __get_user(kurb->type, &uurb->type) ||
1792 __get_user(kurb->endpoint, &uurb->endpoint) ||
1793 __get_user(kurb->status, &uurb->status) ||
1794 __get_user(kurb->flags, &uurb->flags) ||
1795 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1796 __get_user(kurb->actual_length, &uurb->actual_length) ||
1797 __get_user(kurb->start_frame, &uurb->start_frame) ||
1798 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1799 __get_user(kurb->error_count, &uurb->error_count) ||
1800 __get_user(kurb->signr, &uurb->signr))
1803 if (__get_user(uptr, &uurb->buffer))
1805 kurb->buffer = compat_ptr(uptr);
1806 if (__get_user(uptr, &uurb->usercontext))
1808 kurb->usercontext = compat_ptr(uptr);
1813 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1815 struct usbdevfs_urb uurb;
1817 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1820 return proc_do_submiturb(ps, &uurb,
1821 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1825 static int processcompl_compat(struct async *as, void __user * __user *arg)
1827 struct urb *urb = as->urb;
1828 struct usbdevfs_urb32 __user *userurb = as->userurb;
1829 void __user *addr = as->userurb;
1832 if (as->userbuffer && urb->actual_length) {
1833 if (copy_urb_data_to_user(as->userbuffer, urb))
1836 if (put_user(as->status, &userurb->status))
1838 if (put_user(urb->actual_length, &userurb->actual_length))
1840 if (put_user(urb->error_count, &userurb->error_count))
1843 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1844 for (i = 0; i < urb->number_of_packets; i++) {
1845 if (put_user(urb->iso_frame_desc[i].actual_length,
1846 &userurb->iso_frame_desc[i].actual_length))
1848 if (put_user(urb->iso_frame_desc[i].status,
1849 &userurb->iso_frame_desc[i].status))
1854 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1859 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
1861 struct async *as = reap_as(ps);
1863 int retval = processcompl_compat(as, (void __user * __user *)arg);
1867 if (signal_pending(current))
1872 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
1877 as = async_getcompleted(ps);
1879 retval = processcompl_compat(as, (void __user * __user *)arg);
1882 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1890 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
1892 struct usbdevfs_disconnectsignal ds;
1894 if (copy_from_user(&ds, arg, sizeof(ds)))
1896 ps->discsignr = ds.signr;
1897 ps->disccontext = ds.context;
1901 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
1905 if (get_user(ifnum, (unsigned int __user *)arg))
1907 return claimintf(ps, ifnum);
1910 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
1915 if (get_user(ifnum, (unsigned int __user *)arg))
1917 ret = releaseintf(ps, ifnum);
1920 destroy_async_on_interface (ps, ifnum);
1924 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
1929 struct usb_interface *intf = NULL;
1930 struct usb_driver *driver = NULL;
1933 size = _IOC_SIZE(ctl->ioctl_code);
1935 buf = kmalloc(size, GFP_KERNEL);
1938 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1939 if (copy_from_user(buf, ctl->data, size)) {
1944 memset(buf, 0, size);
1948 if (!connected(ps)) {
1953 if (ps->dev->state != USB_STATE_CONFIGURED)
1954 retval = -EHOSTUNREACH;
1955 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1957 else switch (ctl->ioctl_code) {
1959 /* disconnect kernel driver from interface */
1960 case USBDEVFS_DISCONNECT:
1961 if (intf->dev.driver) {
1962 driver = to_usb_driver(intf->dev.driver);
1963 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1964 usb_driver_release_interface(driver, intf);
1969 /* let kernel drivers try to (re)bind to the interface */
1970 case USBDEVFS_CONNECT:
1971 if (!intf->dev.driver)
1972 retval = device_attach(&intf->dev);
1977 /* talk directly to the interface's driver */
1979 if (intf->dev.driver)
1980 driver = to_usb_driver(intf->dev.driver);
1981 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1984 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1985 if (retval == -ENOIOCTLCMD)
1990 /* cleanup and return */
1992 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1994 && copy_to_user(ctl->data, buf, size) != 0)
2001 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2003 struct usbdevfs_ioctl ctrl;
2005 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2007 return proc_ioctl(ps, &ctrl);
2010 #ifdef CONFIG_COMPAT
2011 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2013 struct usbdevfs_ioctl32 __user *uioc;
2014 struct usbdevfs_ioctl ctrl;
2017 uioc = compat_ptr((long)arg);
2018 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2019 __get_user(ctrl.ifno, &uioc->ifno) ||
2020 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2021 __get_user(udata, &uioc->data))
2023 ctrl.data = compat_ptr(udata);
2025 return proc_ioctl(ps, &ctrl);
2029 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2034 if (get_user(portnum, (unsigned __user *) arg))
2036 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2038 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2039 portnum, task_pid_nr(current), current->comm);
2043 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2047 if (get_user(portnum, (unsigned __user *) arg))
2049 return usb_hub_release_port(ps->dev, portnum, ps);
2052 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2056 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2057 USBDEVFS_CAP_REAP_AFTER_DISCONNECT;
2058 if (!ps->dev->bus->no_stop_on_short)
2059 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2060 if (ps->dev->bus->sg_tablesize)
2061 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2063 if (put_user(caps, (__u32 __user *)arg))
2069 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2071 struct usbdevfs_disconnect_claim dc;
2072 struct usb_interface *intf;
2074 if (copy_from_user(&dc, arg, sizeof(dc)))
2077 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2081 if (intf->dev.driver) {
2082 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2084 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2085 strncmp(dc.driver, intf->dev.driver->name,
2086 sizeof(dc.driver)) != 0)
2089 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2090 strncmp(dc.driver, intf->dev.driver->name,
2091 sizeof(dc.driver)) == 0)
2094 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2095 usb_driver_release_interface(driver, intf);
2098 return claimintf(ps, dc.interface);
2101 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2103 unsigned num_streams, num_eps;
2104 struct usb_host_endpoint **eps;
2105 struct usb_interface *intf;
2108 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2113 destroy_async_on_interface(ps,
2114 intf->altsetting[0].desc.bInterfaceNumber);
2116 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2121 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2124 struct usb_host_endpoint **eps;
2125 struct usb_interface *intf;
2128 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2132 destroy_async_on_interface(ps,
2133 intf->altsetting[0].desc.bInterfaceNumber);
2135 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2141 * NOTE: All requests here that have interface numbers as parameters
2142 * are assuming that somehow the configuration has been prevented from
2143 * changing. But there's no mechanism to ensure that...
2145 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2148 struct usb_dev_state *ps = file->private_data;
2149 struct inode *inode = file_inode(file);
2150 struct usb_device *dev = ps->dev;
2153 if (!(file->f_mode & FMODE_WRITE))
2156 usb_lock_device(dev);
2158 /* Reap operations are allowed even after disconnection */
2160 case USBDEVFS_REAPURB:
2161 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2162 ret = proc_reapurb(ps, p);
2165 case USBDEVFS_REAPURBNDELAY:
2166 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2167 ret = proc_reapurbnonblock(ps, p);
2170 #ifdef CONFIG_COMPAT
2171 case USBDEVFS_REAPURB32:
2172 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2173 ret = proc_reapurb_compat(ps, p);
2176 case USBDEVFS_REAPURBNDELAY32:
2177 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2178 ret = proc_reapurbnonblock_compat(ps, p);
2183 if (!connected(ps)) {
2184 usb_unlock_device(dev);
2189 case USBDEVFS_CONTROL:
2190 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2191 ret = proc_control(ps, p);
2193 inode->i_mtime = CURRENT_TIME;
2197 snoop(&dev->dev, "%s: BULK\n", __func__);
2198 ret = proc_bulk(ps, p);
2200 inode->i_mtime = CURRENT_TIME;
2203 case USBDEVFS_RESETEP:
2204 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2205 ret = proc_resetep(ps, p);
2207 inode->i_mtime = CURRENT_TIME;
2210 case USBDEVFS_RESET:
2211 snoop(&dev->dev, "%s: RESET\n", __func__);
2212 ret = proc_resetdevice(ps);
2215 case USBDEVFS_CLEAR_HALT:
2216 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2217 ret = proc_clearhalt(ps, p);
2219 inode->i_mtime = CURRENT_TIME;
2222 case USBDEVFS_GETDRIVER:
2223 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2224 ret = proc_getdriver(ps, p);
2227 case USBDEVFS_CONNECTINFO:
2228 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2229 ret = proc_connectinfo(ps, p);
2232 case USBDEVFS_SETINTERFACE:
2233 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2234 ret = proc_setintf(ps, p);
2237 case USBDEVFS_SETCONFIGURATION:
2238 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2239 ret = proc_setconfig(ps, p);
2242 case USBDEVFS_SUBMITURB:
2243 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2244 ret = proc_submiturb(ps, p);
2246 inode->i_mtime = CURRENT_TIME;
2249 #ifdef CONFIG_COMPAT
2250 case USBDEVFS_CONTROL32:
2251 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2252 ret = proc_control_compat(ps, p);
2254 inode->i_mtime = CURRENT_TIME;
2257 case USBDEVFS_BULK32:
2258 snoop(&dev->dev, "%s: BULK32\n", __func__);
2259 ret = proc_bulk_compat(ps, p);
2261 inode->i_mtime = CURRENT_TIME;
2264 case USBDEVFS_DISCSIGNAL32:
2265 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2266 ret = proc_disconnectsignal_compat(ps, p);
2269 case USBDEVFS_SUBMITURB32:
2270 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2271 ret = proc_submiturb_compat(ps, p);
2273 inode->i_mtime = CURRENT_TIME;
2276 case USBDEVFS_IOCTL32:
2277 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2278 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2282 case USBDEVFS_DISCARDURB:
2283 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2284 ret = proc_unlinkurb(ps, p);
2287 case USBDEVFS_DISCSIGNAL:
2288 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2289 ret = proc_disconnectsignal(ps, p);
2292 case USBDEVFS_CLAIMINTERFACE:
2293 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2294 ret = proc_claiminterface(ps, p);
2297 case USBDEVFS_RELEASEINTERFACE:
2298 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2299 ret = proc_releaseinterface(ps, p);
2302 case USBDEVFS_IOCTL:
2303 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2304 ret = proc_ioctl_default(ps, p);
2307 case USBDEVFS_CLAIM_PORT:
2308 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2309 ret = proc_claim_port(ps, p);
2312 case USBDEVFS_RELEASE_PORT:
2313 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2314 ret = proc_release_port(ps, p);
2316 case USBDEVFS_GET_CAPABILITIES:
2317 ret = proc_get_capabilities(ps, p);
2319 case USBDEVFS_DISCONNECT_CLAIM:
2320 ret = proc_disconnect_claim(ps, p);
2322 case USBDEVFS_ALLOC_STREAMS:
2323 ret = proc_alloc_streams(ps, p);
2325 case USBDEVFS_FREE_STREAMS:
2326 ret = proc_free_streams(ps, p);
2331 usb_unlock_device(dev);
2333 inode->i_atime = CURRENT_TIME;
2337 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2342 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2347 #ifdef CONFIG_COMPAT
2348 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2353 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2359 /* No kernel lock - fine */
2360 static unsigned int usbdev_poll(struct file *file,
2361 struct poll_table_struct *wait)
2363 struct usb_dev_state *ps = file->private_data;
2364 unsigned int mask = 0;
2366 poll_wait(file, &ps->wait, wait);
2367 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2368 mask |= POLLOUT | POLLWRNORM;
2370 mask |= POLLERR | POLLHUP;
2374 const struct file_operations usbdev_file_operations = {
2375 .owner = THIS_MODULE,
2376 .llseek = usbdev_lseek,
2377 .read = usbdev_read,
2378 .poll = usbdev_poll,
2379 .unlocked_ioctl = usbdev_ioctl,
2380 #ifdef CONFIG_COMPAT
2381 .compat_ioctl = usbdev_compat_ioctl,
2383 .open = usbdev_open,
2384 .release = usbdev_release,
2387 static void usbdev_remove(struct usb_device *udev)
2389 struct usb_dev_state *ps;
2390 struct siginfo sinfo;
2392 while (!list_empty(&udev->filelist)) {
2393 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2394 destroy_all_async(ps);
2395 wake_up_all(&ps->wait);
2396 list_del_init(&ps->list);
2397 if (ps->discsignr) {
2398 memset(&sinfo, 0, sizeof(sinfo));
2399 sinfo.si_signo = ps->discsignr;
2400 sinfo.si_errno = EPIPE;
2401 sinfo.si_code = SI_ASYNCIO;
2402 sinfo.si_addr = ps->disccontext;
2403 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2404 ps->disc_pid, ps->cred, ps->secid);
2409 static int usbdev_notify(struct notifier_block *self,
2410 unsigned long action, void *dev)
2413 case USB_DEVICE_ADD:
2415 case USB_DEVICE_REMOVE:
2422 static struct notifier_block usbdev_nb = {
2423 .notifier_call = usbdev_notify,
2426 static struct cdev usb_device_cdev;
2428 int __init usb_devio_init(void)
2432 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2435 printk(KERN_ERR "Unable to register minors for usb_device\n");
2438 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2439 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2441 printk(KERN_ERR "Unable to get usb_device major %d\n",
2445 usb_register_notify(&usbdev_nb);
2450 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2454 void usb_devio_cleanup(void)
2456 usb_unregister_notify(&usbdev_nb);
2457 cdev_del(&usb_device_cdev);
2458 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);