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 <linux/dma-mapping.h>
54 #include <asm/byteorder.h>
55 #include <linux/moduleparam.h>
60 #define USB_DEVICE_MAX (USB_MAXBUS * 128)
61 #define USB_SG_SIZE 16384 /* split-size for large txs */
63 /* Mutual exclusion for removal, open, and release */
64 DEFINE_MUTEX(usbfs_mutex);
66 struct usb_dev_state {
67 struct list_head list; /* state list */
68 struct usb_device *dev;
70 spinlock_t lock; /* protects the async urb lists */
71 struct list_head async_pending;
72 struct list_head async_completed;
73 struct list_head memory_list;
74 wait_queue_head_t wait; /* wake up if a request completed */
75 unsigned int discsignr;
77 const struct cred *cred;
78 void __user *disccontext;
79 unsigned long ifclaimed;
81 u32 disabled_bulk_eps;
82 bool privileges_dropped;
83 unsigned long interface_allowed_mask;
87 struct list_head memlist;
92 dma_addr_t dma_handle;
93 unsigned long vm_start;
94 struct usb_dev_state *ps;
98 struct list_head asynclist;
99 struct usb_dev_state *ps;
101 const struct cred *cred;
104 void __user *userbuffer;
105 void __user *userurb;
107 struct usb_memory *usbm;
108 unsigned int mem_usage;
115 static bool usbfs_snoop;
116 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
117 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
119 static unsigned usbfs_snoop_max = 65536;
120 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
121 MODULE_PARM_DESC(usbfs_snoop_max,
122 "maximum number of bytes to print while snooping");
124 #define snoop(dev, format, arg...) \
127 dev_info(dev, format, ## arg); \
134 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
136 /* Limit on the total amount of memory we can allocate for transfers */
137 static u32 usbfs_memory_mb = 16;
138 module_param(usbfs_memory_mb, uint, 0644);
139 MODULE_PARM_DESC(usbfs_memory_mb,
140 "maximum MB allowed for usbfs buffers (0 = no limit)");
142 /* Hard limit, necessary to avoid arithmetic overflow */
143 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
145 static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */
147 /* Check whether it's okay to allocate more memory for a transfer */
148 static int usbfs_increase_memory_usage(u64 amount)
152 lim = ACCESS_ONCE(usbfs_memory_mb);
155 atomic64_add(amount, &usbfs_memory_usage);
157 if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
158 atomic64_sub(amount, &usbfs_memory_usage);
165 /* Memory for a transfer is being deallocated */
166 static void usbfs_decrease_memory_usage(u64 amount)
168 atomic64_sub(amount, &usbfs_memory_usage);
171 static int connected(struct usb_dev_state *ps)
173 return (!list_empty(&ps->list) &&
174 ps->dev->state != USB_STATE_NOTATTACHED);
177 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
179 struct usb_dev_state *ps = usbm->ps;
182 spin_lock_irqsave(&ps->lock, flags);
184 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
185 list_del(&usbm->memlist);
186 spin_unlock_irqrestore(&ps->lock, flags);
188 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
190 usbfs_decrease_memory_usage(
191 usbm->size + sizeof(struct usb_memory));
194 spin_unlock_irqrestore(&ps->lock, flags);
198 static void usbdev_vm_open(struct vm_area_struct *vma)
200 struct usb_memory *usbm = vma->vm_private_data;
203 spin_lock_irqsave(&usbm->ps->lock, flags);
204 ++usbm->vma_use_count;
205 spin_unlock_irqrestore(&usbm->ps->lock, flags);
208 static void usbdev_vm_close(struct vm_area_struct *vma)
210 struct usb_memory *usbm = vma->vm_private_data;
212 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
215 static struct vm_operations_struct usbdev_vm_ops = {
216 .open = usbdev_vm_open,
217 .close = usbdev_vm_close
220 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
222 struct usb_memory *usbm = NULL;
223 struct usb_dev_state *ps = file->private_data;
224 size_t size = vma->vm_end - vma->vm_start;
227 dma_addr_t dma_handle;
230 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
234 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
237 goto error_decrease_mem;
240 mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
244 goto error_free_usbm;
247 memset(mem, 0, size);
250 usbm->dma_handle = dma_handle;
253 usbm->vm_start = vma->vm_start;
254 usbm->vma_use_count = 1;
255 INIT_LIST_HEAD(&usbm->memlist);
257 if (remap_pfn_range(vma, vma->vm_start,
258 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
259 size, vma->vm_page_prot) < 0) {
260 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
264 vma->vm_flags |= VM_IO;
265 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
266 vma->vm_ops = &usbdev_vm_ops;
267 vma->vm_private_data = usbm;
269 spin_lock_irqsave(&ps->lock, flags);
270 list_add_tail(&usbm->memlist, &ps->memory_list);
271 spin_unlock_irqrestore(&ps->lock, flags);
278 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
283 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
286 struct usb_dev_state *ps = file->private_data;
287 struct usb_device *dev = ps->dev;
294 usb_lock_device(dev);
295 if (!connected(ps)) {
298 } else if (pos < 0) {
303 if (pos < sizeof(struct usb_device_descriptor)) {
304 /* 18 bytes - fits on the stack */
305 struct usb_device_descriptor temp_desc;
307 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
308 le16_to_cpus(&temp_desc.bcdUSB);
309 le16_to_cpus(&temp_desc.idVendor);
310 le16_to_cpus(&temp_desc.idProduct);
311 le16_to_cpus(&temp_desc.bcdDevice);
313 len = sizeof(struct usb_device_descriptor) - pos;
316 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
327 pos = sizeof(struct usb_device_descriptor);
328 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
329 struct usb_config_descriptor *config =
330 (struct usb_config_descriptor *)dev->rawdescriptors[i];
331 unsigned int length = le16_to_cpu(config->wTotalLength);
333 if (*ppos < pos + length) {
335 /* The descriptor may claim to be longer than it
336 * really is. Here is the actual allocated length. */
338 le16_to_cpu(dev->config[i].desc.wTotalLength);
340 len = length - (*ppos - pos);
344 /* Simply don't write (skip over) unallocated parts */
345 if (alloclen > (*ppos - pos)) {
346 alloclen -= (*ppos - pos);
347 if (copy_to_user(buf,
348 dev->rawdescriptors[i] + (*ppos - pos),
349 min(len, alloclen))) {
365 usb_unlock_device(dev);
370 * async list handling
373 static struct async *alloc_async(unsigned int numisoframes)
377 as = kzalloc(sizeof(struct async), GFP_KERNEL);
380 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
388 static void free_async(struct async *as)
395 for (i = 0; i < as->urb->num_sgs; i++) {
396 if (sg_page(&as->urb->sg[i]))
397 kfree(sg_virt(&as->urb->sg[i]));
401 if (as->usbm == NULL)
402 kfree(as->urb->transfer_buffer);
404 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
406 kfree(as->urb->setup_packet);
407 usb_free_urb(as->urb);
408 usbfs_decrease_memory_usage(as->mem_usage);
412 static void async_newpending(struct async *as)
414 struct usb_dev_state *ps = as->ps;
417 spin_lock_irqsave(&ps->lock, flags);
418 list_add_tail(&as->asynclist, &ps->async_pending);
419 spin_unlock_irqrestore(&ps->lock, flags);
422 static void async_removepending(struct async *as)
424 struct usb_dev_state *ps = as->ps;
427 spin_lock_irqsave(&ps->lock, flags);
428 list_del_init(&as->asynclist);
429 spin_unlock_irqrestore(&ps->lock, flags);
432 static struct async *async_getcompleted(struct usb_dev_state *ps)
435 struct async *as = NULL;
437 spin_lock_irqsave(&ps->lock, flags);
438 if (!list_empty(&ps->async_completed)) {
439 as = list_entry(ps->async_completed.next, struct async,
441 list_del_init(&as->asynclist);
443 spin_unlock_irqrestore(&ps->lock, flags);
447 static struct async *async_getpending(struct usb_dev_state *ps,
448 void __user *userurb)
452 list_for_each_entry(as, &ps->async_pending, asynclist)
453 if (as->userurb == userurb) {
454 list_del_init(&as->asynclist);
461 static void snoop_urb(struct usb_device *udev,
462 void __user *userurb, int pipe, unsigned length,
463 int timeout_or_status, enum snoop_when when,
464 unsigned char *data, unsigned data_len)
466 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
467 static const char *dirs[] = {"out", "in"};
474 ep = usb_pipeendpoint(pipe);
475 t = types[usb_pipetype(pipe)];
476 d = dirs[!!usb_pipein(pipe)];
478 if (userurb) { /* Async */
480 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
482 userurb, ep, t, d, length);
484 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
485 "actual_length %u status %d\n",
486 userurb, ep, t, d, length,
490 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
492 ep, t, d, length, timeout_or_status);
494 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
496 ep, t, d, length, timeout_or_status);
499 data_len = min(data_len, usbfs_snoop_max);
500 if (data && data_len > 0) {
501 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
506 static void snoop_urb_data(struct urb *urb, unsigned len)
510 len = min(len, usbfs_snoop_max);
511 if (!usbfs_snoop || len == 0)
514 if (urb->num_sgs == 0) {
515 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
516 urb->transfer_buffer, len, 1);
520 for (i = 0; i < urb->num_sgs && len; i++) {
521 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
522 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
523 sg_virt(&urb->sg[i]), size, 1);
528 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
530 unsigned i, len, size;
532 if (urb->number_of_packets > 0) /* Isochronous */
533 len = urb->transfer_buffer_length;
535 len = urb->actual_length;
537 if (urb->num_sgs == 0) {
538 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
543 for (i = 0; i < urb->num_sgs && len; i++) {
544 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
545 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
554 #define AS_CONTINUATION 1
557 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
564 /* Mark all the pending URBs that match bulk_addr, up to but not
565 * including the first one without AS_CONTINUATION. If such an
566 * URB is encountered then a new transfer has already started so
567 * the endpoint doesn't need to be disabled; otherwise it does.
569 list_for_each_entry(as, &ps->async_pending, asynclist) {
570 if (as->bulk_addr == bulk_addr) {
571 if (as->bulk_status != AS_CONTINUATION)
573 as->bulk_status = AS_UNLINK;
577 ps->disabled_bulk_eps |= (1 << bulk_addr);
579 /* Now carefully unlink all the marked pending URBs */
581 list_for_each_entry(as, &ps->async_pending, asynclist) {
582 if (as->bulk_status == AS_UNLINK) {
583 as->bulk_status = 0; /* Only once */
586 spin_unlock(&ps->lock); /* Allow completions */
589 spin_lock(&ps->lock);
595 static void async_completed(struct urb *urb)
597 struct async *as = urb->context;
598 struct usb_dev_state *ps = as->ps;
599 struct siginfo sinfo;
600 struct pid *pid = NULL;
602 const struct cred *cred = NULL;
605 spin_lock(&ps->lock);
606 list_move_tail(&as->asynclist, &ps->async_completed);
607 as->status = urb->status;
610 memset(&sinfo, 0, sizeof(sinfo));
611 sinfo.si_signo = as->signr;
612 sinfo.si_errno = as->status;
613 sinfo.si_code = SI_ASYNCIO;
614 sinfo.si_addr = as->userurb;
615 pid = get_pid(as->pid);
616 cred = get_cred(as->cred);
619 snoop(&urb->dev->dev, "urb complete\n");
620 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
621 as->status, COMPLETE, NULL, 0);
622 if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
623 snoop_urb_data(urb, urb->actual_length);
625 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
626 as->status != -ENOENT)
627 cancel_bulk_urbs(ps, as->bulk_addr);
630 spin_unlock(&ps->lock);
633 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
639 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
645 spin_lock_irqsave(&ps->lock, flags);
646 while (!list_empty(list)) {
647 as = list_entry(list->next, struct async, asynclist);
648 list_del_init(&as->asynclist);
652 /* drop the spinlock so the completion handler can run */
653 spin_unlock_irqrestore(&ps->lock, flags);
656 spin_lock_irqsave(&ps->lock, flags);
658 spin_unlock_irqrestore(&ps->lock, flags);
661 static void destroy_async_on_interface(struct usb_dev_state *ps,
664 struct list_head *p, *q, hitlist;
667 INIT_LIST_HEAD(&hitlist);
668 spin_lock_irqsave(&ps->lock, flags);
669 list_for_each_safe(p, q, &ps->async_pending)
670 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
671 list_move_tail(p, &hitlist);
672 spin_unlock_irqrestore(&ps->lock, flags);
673 destroy_async(ps, &hitlist);
676 static void destroy_all_async(struct usb_dev_state *ps)
678 destroy_async(ps, &ps->async_pending);
682 * interface claims are made only at the request of user level code,
683 * which can also release them (explicitly or by closing files).
684 * they're also undone when devices disconnect.
687 static int driver_probe(struct usb_interface *intf,
688 const struct usb_device_id *id)
693 static void driver_disconnect(struct usb_interface *intf)
695 struct usb_dev_state *ps = usb_get_intfdata(intf);
696 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
701 /* NOTE: this relies on usbcore having canceled and completed
702 * all pending I/O requests; 2.6 does that.
705 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
706 clear_bit(ifnum, &ps->ifclaimed);
708 dev_warn(&intf->dev, "interface number %u out of range\n",
711 usb_set_intfdata(intf, NULL);
713 /* force async requests to complete */
714 destroy_async_on_interface(ps, ifnum);
717 /* The following routines are merely placeholders. There is no way
718 * to inform a user task about suspend or resumes.
720 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
725 static int driver_resume(struct usb_interface *intf)
730 struct usb_driver usbfs_driver = {
732 .probe = driver_probe,
733 .disconnect = driver_disconnect,
734 .suspend = driver_suspend,
735 .resume = driver_resume,
738 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
740 struct usb_device *dev = ps->dev;
741 struct usb_interface *intf;
744 if (ifnum >= 8*sizeof(ps->ifclaimed))
746 /* already claimed */
747 if (test_bit(ifnum, &ps->ifclaimed))
750 if (ps->privileges_dropped &&
751 !test_bit(ifnum, &ps->interface_allowed_mask))
754 intf = usb_ifnum_to_if(dev, ifnum);
758 unsigned int old_suppress;
760 /* suppress uevents while claiming interface */
761 old_suppress = dev_get_uevent_suppress(&intf->dev);
762 dev_set_uevent_suppress(&intf->dev, 1);
763 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
764 dev_set_uevent_suppress(&intf->dev, old_suppress);
767 set_bit(ifnum, &ps->ifclaimed);
771 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
773 struct usb_device *dev;
774 struct usb_interface *intf;
778 if (ifnum >= 8*sizeof(ps->ifclaimed))
781 intf = usb_ifnum_to_if(dev, ifnum);
784 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
785 unsigned int old_suppress;
787 /* suppress uevents while releasing interface */
788 old_suppress = dev_get_uevent_suppress(&intf->dev);
789 dev_set_uevent_suppress(&intf->dev, 1);
790 usb_driver_release_interface(&usbfs_driver, intf);
791 dev_set_uevent_suppress(&intf->dev, old_suppress);
797 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
799 if (ps->dev->state != USB_STATE_CONFIGURED)
800 return -EHOSTUNREACH;
801 if (ifnum >= 8*sizeof(ps->ifclaimed))
803 if (test_bit(ifnum, &ps->ifclaimed))
805 /* if not yet claimed, claim it for the driver */
806 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
807 "interface %u before use\n", task_pid_nr(current),
808 current->comm, ifnum);
809 return claimintf(ps, ifnum);
812 static int findintfep(struct usb_device *dev, unsigned int ep)
814 unsigned int i, j, e;
815 struct usb_interface *intf;
816 struct usb_host_interface *alts;
817 struct usb_endpoint_descriptor *endpt;
819 if (ep & ~(USB_DIR_IN|0xf))
823 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
824 intf = dev->actconfig->interface[i];
825 for (j = 0; j < intf->num_altsetting; j++) {
826 alts = &intf->altsetting[j];
827 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
828 endpt = &alts->endpoint[e].desc;
829 if (endpt->bEndpointAddress == ep)
830 return alts->desc.bInterfaceNumber;
837 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
838 unsigned int request, unsigned int index)
841 struct usb_host_interface *alt_setting;
843 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
844 && ps->dev->state != USB_STATE_ADDRESS
845 && ps->dev->state != USB_STATE_CONFIGURED)
846 return -EHOSTUNREACH;
847 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
851 * check for the special corner case 'get_device_id' in the printer
852 * class specification, which we always want to allow as it is used
853 * to query things like ink level, etc.
855 if (requesttype == 0xa1 && request == 0) {
856 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
857 index >> 8, index & 0xff);
859 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
864 switch (requesttype & USB_RECIP_MASK) {
865 case USB_RECIP_ENDPOINT:
866 if ((index & ~USB_DIR_IN) == 0)
868 ret = findintfep(ps->dev, index);
871 * Some not fully compliant Win apps seem to get
872 * index wrong and have the endpoint number here
873 * rather than the endpoint address (with the
874 * correct direction). Win does let this through,
875 * so we'll not reject it here but leave it to
876 * the device to not break KVM. But we warn.
878 ret = findintfep(ps->dev, index ^ 0x80);
880 dev_info(&ps->dev->dev,
881 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
882 __func__, task_pid_nr(current),
883 current->comm, index, index ^ 0x80);
886 ret = checkintf(ps, ret);
889 case USB_RECIP_INTERFACE:
890 ret = checkintf(ps, index);
896 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
899 if (ep & USB_ENDPOINT_DIR_MASK)
900 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
902 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
905 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
906 struct usbdevfs_streams __user *streams,
907 unsigned int *num_streams_ret,
908 unsigned int *num_eps_ret,
909 struct usb_host_endpoint ***eps_ret,
910 struct usb_interface **intf_ret)
912 unsigned int i, num_streams, num_eps;
913 struct usb_host_endpoint **eps;
914 struct usb_interface *intf = NULL;
918 if (get_user(num_streams, &streams->num_streams) ||
919 get_user(num_eps, &streams->num_eps))
922 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
925 /* The XHCI controller allows max 2 ^ 16 streams */
926 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
929 eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
933 for (i = 0; i < num_eps; i++) {
934 if (get_user(ep, &streams->eps[i])) {
938 eps[i] = ep_to_host_endpoint(ps->dev, ep);
944 /* usb_alloc/free_streams operate on an usb_interface */
945 ifnum = findintfep(ps->dev, ep);
952 ret = checkintf(ps, ifnum);
955 intf = usb_ifnum_to_if(ps->dev, ifnum);
957 /* Verify all eps belong to the same interface */
958 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
966 *num_streams_ret = num_streams;
967 *num_eps_ret = num_eps;
978 static int match_devt(struct device *dev, void *data)
980 return dev->devt == (dev_t) (unsigned long) data;
983 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
987 dev = bus_find_device(&usb_bus_type, NULL,
988 (void *) (unsigned long) devt, match_devt);
991 return to_usb_device(dev);
997 static int usbdev_open(struct inode *inode, struct file *file)
999 struct usb_device *dev = NULL;
1000 struct usb_dev_state *ps;
1004 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1010 /* Protect against simultaneous removal or release */
1011 mutex_lock(&usbfs_mutex);
1013 /* usbdev device-node */
1014 if (imajor(inode) == USB_DEVICE_MAJOR)
1015 dev = usbdev_lookup_by_devt(inode->i_rdev);
1017 mutex_unlock(&usbfs_mutex);
1022 usb_lock_device(dev);
1023 if (dev->state == USB_STATE_NOTATTACHED)
1024 goto out_unlock_device;
1026 ret = usb_autoresume_device(dev);
1028 goto out_unlock_device;
1032 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1033 spin_lock_init(&ps->lock);
1034 INIT_LIST_HEAD(&ps->list);
1035 INIT_LIST_HEAD(&ps->async_pending);
1036 INIT_LIST_HEAD(&ps->async_completed);
1037 INIT_LIST_HEAD(&ps->memory_list);
1038 init_waitqueue_head(&ps->wait);
1039 ps->disc_pid = get_pid(task_pid(current));
1040 ps->cred = get_current_cred();
1041 security_task_getsecid(current, &ps->secid);
1043 list_add_tail(&ps->list, &dev->filelist);
1044 file->private_data = ps;
1045 usb_unlock_device(dev);
1046 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1051 usb_unlock_device(dev);
1058 static int usbdev_release(struct inode *inode, struct file *file)
1060 struct usb_dev_state *ps = file->private_data;
1061 struct usb_device *dev = ps->dev;
1065 usb_lock_device(dev);
1066 usb_hub_release_all_ports(dev, ps);
1068 list_del_init(&ps->list);
1070 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1072 if (test_bit(ifnum, &ps->ifclaimed))
1073 releaseintf(ps, ifnum);
1075 destroy_all_async(ps);
1076 usb_autosuspend_device(dev);
1077 usb_unlock_device(dev);
1079 put_pid(ps->disc_pid);
1082 as = async_getcompleted(ps);
1085 as = async_getcompleted(ps);
1092 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1094 struct usb_device *dev = ps->dev;
1095 struct usbdevfs_ctrltransfer ctrl;
1097 unsigned char *tbuf;
1101 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1103 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1107 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
1108 if (wLength > PAGE_SIZE)
1110 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1111 sizeof(struct usb_ctrlrequest));
1114 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1120 snoop(&dev->dev, "control urb: bRequestType=%02x "
1121 "bRequest=%02x wValue=%04x "
1122 "wIndex=%04x wLength=%04x\n",
1123 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1124 ctrl.wIndex, ctrl.wLength);
1125 if (ctrl.bRequestType & 0x80) {
1126 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1131 pipe = usb_rcvctrlpipe(dev, 0);
1132 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1134 usb_unlock_device(dev);
1135 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1136 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1137 tbuf, ctrl.wLength, tmo);
1138 usb_lock_device(dev);
1139 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1141 if ((i > 0) && ctrl.wLength) {
1142 if (copy_to_user(ctrl.data, tbuf, i)) {
1149 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1154 pipe = usb_sndctrlpipe(dev, 0);
1155 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1156 tbuf, ctrl.wLength);
1158 usb_unlock_device(dev);
1159 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1160 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1161 tbuf, ctrl.wLength, tmo);
1162 usb_lock_device(dev);
1163 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1165 if (i < 0 && i != -EPIPE) {
1166 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1167 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1168 current->comm, ctrl.bRequestType, ctrl.bRequest,
1173 free_page((unsigned long) tbuf);
1174 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1175 sizeof(struct usb_ctrlrequest));
1179 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1181 struct usb_device *dev = ps->dev;
1182 struct usbdevfs_bulktransfer bulk;
1183 unsigned int tmo, len1, pipe;
1185 unsigned char *tbuf;
1188 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1190 ret = findintfep(ps->dev, bulk.ep);
1193 ret = checkintf(ps, ret);
1196 if (bulk.ep & USB_DIR_IN)
1197 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1199 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1200 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1203 if (len1 >= (INT_MAX - sizeof(struct urb)))
1205 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1208 tbuf = kmalloc(len1, GFP_KERNEL);
1214 if (bulk.ep & 0x80) {
1215 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1219 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1221 usb_unlock_device(dev);
1222 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1223 usb_lock_device(dev);
1224 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1227 if (copy_to_user(bulk.data, tbuf, len2)) {
1234 if (copy_from_user(tbuf, bulk.data, len1)) {
1239 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1241 usb_unlock_device(dev);
1242 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1243 usb_lock_device(dev);
1244 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1246 ret = (i < 0 ? i : len2);
1249 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1253 static void check_reset_of_active_ep(struct usb_device *udev,
1254 unsigned int epnum, char *ioctl_name)
1256 struct usb_host_endpoint **eps;
1257 struct usb_host_endpoint *ep;
1259 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1260 ep = eps[epnum & 0x0f];
1261 if (ep && !list_empty(&ep->urb_list))
1262 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1263 task_pid_nr(current), current->comm,
1267 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1272 if (get_user(ep, (unsigned int __user *)arg))
1274 ret = findintfep(ps->dev, ep);
1277 ret = checkintf(ps, ret);
1280 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1281 usb_reset_endpoint(ps->dev, ep);
1285 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1291 if (get_user(ep, (unsigned int __user *)arg))
1293 ret = findintfep(ps->dev, ep);
1296 ret = checkintf(ps, ret);
1299 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1300 if (ep & USB_DIR_IN)
1301 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1303 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1305 return usb_clear_halt(ps->dev, pipe);
1308 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1310 struct usbdevfs_getdriver gd;
1311 struct usb_interface *intf;
1314 if (copy_from_user(&gd, arg, sizeof(gd)))
1316 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1317 if (!intf || !intf->dev.driver)
1320 strlcpy(gd.driver, intf->dev.driver->name,
1322 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1327 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1329 struct usbdevfs_connectinfo ci;
1331 memset(&ci, 0, sizeof(ci));
1332 ci.devnum = ps->dev->devnum;
1333 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1335 if (copy_to_user(arg, &ci, sizeof(ci)))
1340 static int proc_resetdevice(struct usb_dev_state *ps)
1342 struct usb_host_config *actconfig = ps->dev->actconfig;
1343 struct usb_interface *interface;
1346 /* Don't allow a device reset if the process has dropped the
1347 * privilege to do such things and any of the interfaces are
1348 * currently claimed.
1350 if (ps->privileges_dropped && actconfig) {
1351 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1352 interface = actconfig->interface[i];
1353 number = interface->cur_altsetting->desc.bInterfaceNumber;
1354 if (usb_interface_claimed(interface) &&
1355 !test_bit(number, &ps->ifclaimed)) {
1356 dev_warn(&ps->dev->dev,
1357 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1358 number, interface->dev.driver->name, current->comm);
1364 return usb_reset_device(ps->dev);
1367 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1369 struct usbdevfs_setinterface setintf;
1372 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1374 ret = checkintf(ps, setintf.interface);
1378 destroy_async_on_interface(ps, setintf.interface);
1380 return usb_set_interface(ps->dev, setintf.interface,
1381 setintf.altsetting);
1384 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1388 struct usb_host_config *actconfig;
1390 if (get_user(u, (int __user *)arg))
1393 actconfig = ps->dev->actconfig;
1395 /* Don't touch the device if any interfaces are claimed.
1396 * It could interfere with other drivers' operations, and if
1397 * an interface is claimed by usbfs it could easily deadlock.
1402 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1403 if (usb_interface_claimed(actconfig->interface[i])) {
1404 dev_warn(&ps->dev->dev,
1405 "usbfs: interface %d claimed by %s "
1406 "while '%s' sets config #%d\n",
1407 actconfig->interface[i]
1409 ->desc.bInterfaceNumber,
1410 actconfig->interface[i]
1419 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1420 * so avoid usb_set_configuration()'s kick to sysfs
1423 if (actconfig && actconfig->desc.bConfigurationValue == u)
1424 status = usb_reset_configuration(ps->dev);
1426 status = usb_set_configuration(ps->dev, u);
1432 static struct usb_memory *
1433 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1435 struct usb_memory *usbm = NULL, *iter;
1436 unsigned long flags;
1437 unsigned long uurb_start = (unsigned long)uurb->buffer;
1439 spin_lock_irqsave(&ps->lock, flags);
1440 list_for_each_entry(iter, &ps->memory_list, memlist) {
1441 if (uurb_start >= iter->vm_start &&
1442 uurb_start < iter->vm_start + iter->size) {
1443 if (uurb->buffer_length > iter->vm_start + iter->size -
1445 usbm = ERR_PTR(-EINVAL);
1448 usbm->urb_use_count++;
1453 spin_unlock_irqrestore(&ps->lock, flags);
1457 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1458 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1461 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1462 struct usb_host_endpoint *ep;
1463 struct async *as = NULL;
1464 struct usb_ctrlrequest *dr = NULL;
1465 unsigned int u, totlen, isofrmlen;
1466 int i, ret, num_sgs = 0, ifnum = -1;
1467 int number_of_packets = 0;
1468 unsigned int stream_id = 0;
1471 bool allow_short = false;
1472 bool allow_zero = false;
1473 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1474 USBDEVFS_URB_BULK_CONTINUATION |
1475 USBDEVFS_URB_NO_FSBR |
1476 USBDEVFS_URB_ZERO_PACKET |
1477 USBDEVFS_URB_NO_INTERRUPT;
1478 /* USBDEVFS_URB_ISO_ASAP is a special case */
1479 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1480 mask |= USBDEVFS_URB_ISO_ASAP;
1482 if (uurb->flags & ~mask)
1485 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1487 if (uurb->buffer_length > 0 && !uurb->buffer)
1489 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1490 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1491 ifnum = findintfep(ps->dev, uurb->endpoint);
1494 ret = checkintf(ps, ifnum);
1498 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1501 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1504 switch (uurb->type) {
1505 case USBDEVFS_URB_TYPE_CONTROL:
1506 if (!usb_endpoint_xfer_control(&ep->desc))
1508 /* min 8 byte setup packet */
1509 if (uurb->buffer_length < 8)
1511 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1514 if (copy_from_user(dr, uurb->buffer, 8)) {
1518 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1522 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1523 le16_to_cpup(&dr->wIndex));
1526 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1528 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1530 uurb->endpoint |= USB_DIR_IN;
1533 uurb->endpoint &= ~USB_DIR_IN;
1537 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1538 "bRequest=%02x wValue=%04x "
1539 "wIndex=%04x wLength=%04x\n",
1540 dr->bRequestType, dr->bRequest,
1541 __le16_to_cpup(&dr->wValue),
1542 __le16_to_cpup(&dr->wIndex),
1543 __le16_to_cpup(&dr->wLength));
1544 u = sizeof(struct usb_ctrlrequest);
1547 case USBDEVFS_URB_TYPE_BULK:
1552 switch (usb_endpoint_type(&ep->desc)) {
1553 case USB_ENDPOINT_XFER_CONTROL:
1554 case USB_ENDPOINT_XFER_ISOC:
1556 case USB_ENDPOINT_XFER_INT:
1557 /* allow single-shot interrupt transfers */
1558 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1561 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1562 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1565 stream_id = uurb->stream_id;
1568 case USBDEVFS_URB_TYPE_INTERRUPT:
1569 if (!usb_endpoint_xfer_int(&ep->desc))
1578 case USBDEVFS_URB_TYPE_ISO:
1579 /* arbitrary limit */
1580 if (uurb->number_of_packets < 1 ||
1581 uurb->number_of_packets > 128)
1583 if (!usb_endpoint_xfer_isoc(&ep->desc))
1585 number_of_packets = uurb->number_of_packets;
1586 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1588 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1589 if (IS_ERR(isopkt)) {
1590 ret = PTR_ERR(isopkt);
1594 for (totlen = u = 0; u < number_of_packets; u++) {
1596 * arbitrary limit need for USB 3.0
1597 * bMaxBurst (0~15 allowed, 1~16 packets)
1598 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1599 * sizemax: 1024 * 16 * 3 = 49152
1601 if (isopkt[u].length > 49152) {
1605 totlen += isopkt[u].length;
1607 u *= sizeof(struct usb_iso_packet_descriptor);
1608 uurb->buffer_length = totlen;
1615 if (uurb->buffer_length > 0 &&
1616 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1617 uurb->buffer, uurb->buffer_length)) {
1621 as = alloc_async(number_of_packets);
1627 as->usbm = find_memory_area(ps, uurb);
1628 if (IS_ERR(as->usbm)) {
1629 ret = PTR_ERR(as->usbm);
1634 /* do not use SG buffers when memory mapped segments
1640 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1641 num_sgs * sizeof(struct scatterlist);
1642 ret = usbfs_increase_memory_usage(u);
1648 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1654 as->urb->num_sgs = num_sgs;
1655 sg_init_table(as->urb->sg, as->urb->num_sgs);
1657 totlen = uurb->buffer_length;
1658 for (i = 0; i < as->urb->num_sgs; i++) {
1659 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1660 buf = kmalloc(u, GFP_KERNEL);
1665 sg_set_buf(&as->urb->sg[i], buf, u);
1668 if (copy_from_user(buf, uurb->buffer, u)) {
1676 } else if (uurb->buffer_length > 0) {
1678 unsigned long uurb_start = (unsigned long)uurb->buffer;
1680 as->urb->transfer_buffer = as->usbm->mem +
1681 (uurb_start - as->usbm->vm_start);
1683 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1685 if (!as->urb->transfer_buffer) {
1690 if (copy_from_user(as->urb->transfer_buffer,
1692 uurb->buffer_length)) {
1696 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1698 * Isochronous input data may end up being
1699 * discontiguous if some of the packets are
1700 * short. Clear the buffer so that the gaps
1701 * don't leak kernel data to userspace.
1703 memset(as->urb->transfer_buffer, 0,
1704 uurb->buffer_length);
1708 as->urb->dev = ps->dev;
1709 as->urb->pipe = (uurb->type << 30) |
1710 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1711 (uurb->endpoint & USB_DIR_IN);
1713 /* This tedious sequence is necessary because the URB_* flags
1714 * are internal to the kernel and subject to change, whereas
1715 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1717 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1718 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1720 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1721 u |= URB_SHORT_NOT_OK;
1722 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1724 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1725 u |= URB_ZERO_PACKET;
1726 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1727 u |= URB_NO_INTERRUPT;
1728 as->urb->transfer_flags = u;
1730 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1731 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1732 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1733 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1735 as->urb->transfer_buffer_length = uurb->buffer_length;
1736 as->urb->setup_packet = (unsigned char *)dr;
1738 as->urb->start_frame = uurb->start_frame;
1739 as->urb->number_of_packets = number_of_packets;
1740 as->urb->stream_id = stream_id;
1742 if (ep->desc.bInterval) {
1743 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1744 ps->dev->speed == USB_SPEED_HIGH ||
1745 ps->dev->speed >= USB_SPEED_SUPER)
1746 as->urb->interval = 1 <<
1747 min(15, ep->desc.bInterval - 1);
1749 as->urb->interval = ep->desc.bInterval;
1752 as->urb->context = as;
1753 as->urb->complete = async_completed;
1754 for (totlen = u = 0; u < number_of_packets; u++) {
1755 as->urb->iso_frame_desc[u].offset = totlen;
1756 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1757 totlen += isopkt[u].length;
1764 unsigned long uurb_start = (unsigned long)uurb->buffer;
1766 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1767 as->urb->transfer_dma = as->usbm->dma_handle +
1768 (uurb_start - as->usbm->vm_start);
1769 } else if (is_in && uurb->buffer_length > 0)
1770 as->userbuffer = uurb->buffer;
1771 as->signr = uurb->signr;
1773 as->pid = get_pid(task_pid(current));
1774 as->cred = get_current_cred();
1775 security_task_getsecid(current, &as->secid);
1776 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1777 as->urb->transfer_buffer_length, 0, SUBMIT,
1780 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1782 async_newpending(as);
1784 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1785 spin_lock_irq(&ps->lock);
1787 /* Not exactly the endpoint address; the direction bit is
1788 * shifted to the 0x10 position so that the value will be
1791 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1792 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1795 /* If this bulk URB is the start of a new transfer, re-enable
1796 * the endpoint. Otherwise mark it as a continuation URB.
1798 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1799 as->bulk_status = AS_CONTINUATION;
1801 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1803 /* Don't accept continuation URBs if the endpoint is
1804 * disabled because of an earlier error.
1806 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1809 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1810 spin_unlock_irq(&ps->lock);
1812 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1816 dev_printk(KERN_DEBUG, &ps->dev->dev,
1817 "usbfs: usb_submit_urb returned %d\n", ret);
1818 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1819 0, ret, COMPLETE, NULL, 0);
1820 async_removepending(as);
1833 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1835 struct usbdevfs_urb uurb;
1837 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1840 return proc_do_submiturb(ps, &uurb,
1841 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1845 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1849 unsigned long flags;
1851 spin_lock_irqsave(&ps->lock, flags);
1852 as = async_getpending(ps, arg);
1854 spin_unlock_irqrestore(&ps->lock, flags);
1860 spin_unlock_irqrestore(&ps->lock, flags);
1868 static void compute_isochronous_actual_length(struct urb *urb)
1872 if (urb->number_of_packets > 0) {
1873 urb->actual_length = 0;
1874 for (i = 0; i < urb->number_of_packets; i++)
1875 urb->actual_length +=
1876 urb->iso_frame_desc[i].actual_length;
1880 static int processcompl(struct async *as, void __user * __user *arg)
1882 struct urb *urb = as->urb;
1883 struct usbdevfs_urb __user *userurb = as->userurb;
1884 void __user *addr = as->userurb;
1887 compute_isochronous_actual_length(urb);
1888 if (as->userbuffer && urb->actual_length) {
1889 if (copy_urb_data_to_user(as->userbuffer, urb))
1892 if (put_user(as->status, &userurb->status))
1894 if (put_user(urb->actual_length, &userurb->actual_length))
1896 if (put_user(urb->error_count, &userurb->error_count))
1899 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1900 for (i = 0; i < urb->number_of_packets; i++) {
1901 if (put_user(urb->iso_frame_desc[i].actual_length,
1902 &userurb->iso_frame_desc[i].actual_length))
1904 if (put_user(urb->iso_frame_desc[i].status,
1905 &userurb->iso_frame_desc[i].status))
1910 if (put_user(addr, (void __user * __user *)arg))
1918 static struct async *reap_as(struct usb_dev_state *ps)
1920 DECLARE_WAITQUEUE(wait, current);
1921 struct async *as = NULL;
1922 struct usb_device *dev = ps->dev;
1924 add_wait_queue(&ps->wait, &wait);
1926 __set_current_state(TASK_INTERRUPTIBLE);
1927 as = async_getcompleted(ps);
1928 if (as || !connected(ps))
1930 if (signal_pending(current))
1932 usb_unlock_device(dev);
1934 usb_lock_device(dev);
1936 remove_wait_queue(&ps->wait, &wait);
1937 set_current_state(TASK_RUNNING);
1941 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1943 struct async *as = reap_as(ps);
1948 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
1949 retval = processcompl(as, (void __user * __user *)arg);
1953 if (signal_pending(current))
1958 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1963 as = async_getcompleted(ps);
1965 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
1966 retval = processcompl(as, (void __user * __user *)arg);
1969 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1974 #ifdef CONFIG_COMPAT
1975 static int proc_control_compat(struct usb_dev_state *ps,
1976 struct usbdevfs_ctrltransfer32 __user *p32)
1978 struct usbdevfs_ctrltransfer __user *p;
1980 p = compat_alloc_user_space(sizeof(*p));
1981 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1982 get_user(udata, &p32->data) ||
1983 put_user(compat_ptr(udata), &p->data))
1985 return proc_control(ps, p);
1988 static int proc_bulk_compat(struct usb_dev_state *ps,
1989 struct usbdevfs_bulktransfer32 __user *p32)
1991 struct usbdevfs_bulktransfer __user *p;
1993 compat_caddr_t addr;
1995 p = compat_alloc_user_space(sizeof(*p));
1997 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1998 get_user(n, &p32->len) || put_user(n, &p->len) ||
1999 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
2000 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
2003 return proc_bulk(ps, p);
2005 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2007 struct usbdevfs_disconnectsignal32 ds;
2009 if (copy_from_user(&ds, arg, sizeof(ds)))
2011 ps->discsignr = ds.signr;
2012 ps->disccontext = compat_ptr(ds.context);
2016 static int get_urb32(struct usbdevfs_urb *kurb,
2017 struct usbdevfs_urb32 __user *uurb)
2020 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
2021 __get_user(kurb->type, &uurb->type) ||
2022 __get_user(kurb->endpoint, &uurb->endpoint) ||
2023 __get_user(kurb->status, &uurb->status) ||
2024 __get_user(kurb->flags, &uurb->flags) ||
2025 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
2026 __get_user(kurb->actual_length, &uurb->actual_length) ||
2027 __get_user(kurb->start_frame, &uurb->start_frame) ||
2028 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
2029 __get_user(kurb->error_count, &uurb->error_count) ||
2030 __get_user(kurb->signr, &uurb->signr))
2033 if (__get_user(uptr, &uurb->buffer))
2035 kurb->buffer = compat_ptr(uptr);
2036 if (__get_user(uptr, &uurb->usercontext))
2038 kurb->usercontext = compat_ptr(uptr);
2043 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2045 struct usbdevfs_urb uurb;
2047 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2050 return proc_do_submiturb(ps, &uurb,
2051 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2055 static int processcompl_compat(struct async *as, void __user * __user *arg)
2057 struct urb *urb = as->urb;
2058 struct usbdevfs_urb32 __user *userurb = as->userurb;
2059 void __user *addr = as->userurb;
2062 compute_isochronous_actual_length(urb);
2063 if (as->userbuffer && urb->actual_length) {
2064 if (copy_urb_data_to_user(as->userbuffer, urb))
2067 if (put_user(as->status, &userurb->status))
2069 if (put_user(urb->actual_length, &userurb->actual_length))
2071 if (put_user(urb->error_count, &userurb->error_count))
2074 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2075 for (i = 0; i < urb->number_of_packets; i++) {
2076 if (put_user(urb->iso_frame_desc[i].actual_length,
2077 &userurb->iso_frame_desc[i].actual_length))
2079 if (put_user(urb->iso_frame_desc[i].status,
2080 &userurb->iso_frame_desc[i].status))
2085 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2090 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2092 struct async *as = reap_as(ps);
2097 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2098 retval = processcompl_compat(as, (void __user * __user *)arg);
2102 if (signal_pending(current))
2107 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2112 as = async_getcompleted(ps);
2114 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2115 retval = processcompl_compat(as, (void __user * __user *)arg);
2118 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2126 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2128 struct usbdevfs_disconnectsignal ds;
2130 if (copy_from_user(&ds, arg, sizeof(ds)))
2132 ps->discsignr = ds.signr;
2133 ps->disccontext = ds.context;
2137 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2141 if (get_user(ifnum, (unsigned int __user *)arg))
2143 return claimintf(ps, ifnum);
2146 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2151 if (get_user(ifnum, (unsigned int __user *)arg))
2153 ret = releaseintf(ps, ifnum);
2156 destroy_async_on_interface(ps, ifnum);
2160 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2165 struct usb_interface *intf = NULL;
2166 struct usb_driver *driver = NULL;
2168 if (ps->privileges_dropped)
2172 size = _IOC_SIZE(ctl->ioctl_code);
2174 buf = kmalloc(size, GFP_KERNEL);
2177 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2178 if (copy_from_user(buf, ctl->data, size)) {
2183 memset(buf, 0, size);
2187 if (!connected(ps)) {
2192 if (ps->dev->state != USB_STATE_CONFIGURED)
2193 retval = -EHOSTUNREACH;
2194 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2196 else switch (ctl->ioctl_code) {
2198 /* disconnect kernel driver from interface */
2199 case USBDEVFS_DISCONNECT:
2200 if (intf->dev.driver) {
2201 driver = to_usb_driver(intf->dev.driver);
2202 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2203 usb_driver_release_interface(driver, intf);
2208 /* let kernel drivers try to (re)bind to the interface */
2209 case USBDEVFS_CONNECT:
2210 if (!intf->dev.driver)
2211 retval = device_attach(&intf->dev);
2216 /* talk directly to the interface's driver */
2218 if (intf->dev.driver)
2219 driver = to_usb_driver(intf->dev.driver);
2220 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2223 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2224 if (retval == -ENOIOCTLCMD)
2229 /* cleanup and return */
2231 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2233 && copy_to_user(ctl->data, buf, size) != 0)
2240 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2242 struct usbdevfs_ioctl ctrl;
2244 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2246 return proc_ioctl(ps, &ctrl);
2249 #ifdef CONFIG_COMPAT
2250 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2252 struct usbdevfs_ioctl32 __user *uioc;
2253 struct usbdevfs_ioctl ctrl;
2256 uioc = compat_ptr((long)arg);
2257 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2258 __get_user(ctrl.ifno, &uioc->ifno) ||
2259 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2260 __get_user(udata, &uioc->data))
2262 ctrl.data = compat_ptr(udata);
2264 return proc_ioctl(ps, &ctrl);
2268 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2273 if (get_user(portnum, (unsigned __user *) arg))
2275 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2277 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2278 portnum, task_pid_nr(current), current->comm);
2282 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2286 if (get_user(portnum, (unsigned __user *) arg))
2288 return usb_hub_release_port(ps->dev, portnum, ps);
2291 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2295 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2296 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2297 USBDEVFS_CAP_DROP_PRIVILEGES;
2298 if (!ps->dev->bus->no_stop_on_short)
2299 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2300 if (ps->dev->bus->sg_tablesize)
2301 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2303 if (put_user(caps, (__u32 __user *)arg))
2309 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2311 struct usbdevfs_disconnect_claim dc;
2312 struct usb_interface *intf;
2314 if (copy_from_user(&dc, arg, sizeof(dc)))
2317 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2321 if (intf->dev.driver) {
2322 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2324 if (ps->privileges_dropped)
2327 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2328 strncmp(dc.driver, intf->dev.driver->name,
2329 sizeof(dc.driver)) != 0)
2332 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2333 strncmp(dc.driver, intf->dev.driver->name,
2334 sizeof(dc.driver)) == 0)
2337 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2338 usb_driver_release_interface(driver, intf);
2341 return claimintf(ps, dc.interface);
2344 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2346 unsigned num_streams, num_eps;
2347 struct usb_host_endpoint **eps;
2348 struct usb_interface *intf;
2351 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2356 destroy_async_on_interface(ps,
2357 intf->altsetting[0].desc.bInterfaceNumber);
2359 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2364 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2367 struct usb_host_endpoint **eps;
2368 struct usb_interface *intf;
2371 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2375 destroy_async_on_interface(ps,
2376 intf->altsetting[0].desc.bInterfaceNumber);
2378 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2383 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2387 if (copy_from_user(&data, arg, sizeof(data)))
2390 /* This is an one way operation. Once privileges are
2391 * dropped, you cannot regain them. You may however reissue
2392 * this ioctl to shrink the allowed interfaces mask.
2394 ps->interface_allowed_mask &= data;
2395 ps->privileges_dropped = true;
2401 * NOTE: All requests here that have interface numbers as parameters
2402 * are assuming that somehow the configuration has been prevented from
2403 * changing. But there's no mechanism to ensure that...
2405 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2408 struct usb_dev_state *ps = file->private_data;
2409 struct inode *inode = file_inode(file);
2410 struct usb_device *dev = ps->dev;
2413 if (!(file->f_mode & FMODE_WRITE))
2416 usb_lock_device(dev);
2418 /* Reap operations are allowed even after disconnection */
2420 case USBDEVFS_REAPURB:
2421 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2422 ret = proc_reapurb(ps, p);
2425 case USBDEVFS_REAPURBNDELAY:
2426 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2427 ret = proc_reapurbnonblock(ps, p);
2430 #ifdef CONFIG_COMPAT
2431 case USBDEVFS_REAPURB32:
2432 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2433 ret = proc_reapurb_compat(ps, p);
2436 case USBDEVFS_REAPURBNDELAY32:
2437 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2438 ret = proc_reapurbnonblock_compat(ps, p);
2443 if (!connected(ps)) {
2444 usb_unlock_device(dev);
2449 case USBDEVFS_CONTROL:
2450 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2451 ret = proc_control(ps, p);
2453 inode->i_mtime = current_time(inode);
2457 snoop(&dev->dev, "%s: BULK\n", __func__);
2458 ret = proc_bulk(ps, p);
2460 inode->i_mtime = current_time(inode);
2463 case USBDEVFS_RESETEP:
2464 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2465 ret = proc_resetep(ps, p);
2467 inode->i_mtime = current_time(inode);
2470 case USBDEVFS_RESET:
2471 snoop(&dev->dev, "%s: RESET\n", __func__);
2472 ret = proc_resetdevice(ps);
2475 case USBDEVFS_CLEAR_HALT:
2476 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2477 ret = proc_clearhalt(ps, p);
2479 inode->i_mtime = current_time(inode);
2482 case USBDEVFS_GETDRIVER:
2483 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2484 ret = proc_getdriver(ps, p);
2487 case USBDEVFS_CONNECTINFO:
2488 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2489 ret = proc_connectinfo(ps, p);
2492 case USBDEVFS_SETINTERFACE:
2493 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2494 ret = proc_setintf(ps, p);
2497 case USBDEVFS_SETCONFIGURATION:
2498 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2499 ret = proc_setconfig(ps, p);
2502 case USBDEVFS_SUBMITURB:
2503 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2504 ret = proc_submiturb(ps, p);
2506 inode->i_mtime = current_time(inode);
2509 #ifdef CONFIG_COMPAT
2510 case USBDEVFS_CONTROL32:
2511 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2512 ret = proc_control_compat(ps, p);
2514 inode->i_mtime = current_time(inode);
2517 case USBDEVFS_BULK32:
2518 snoop(&dev->dev, "%s: BULK32\n", __func__);
2519 ret = proc_bulk_compat(ps, p);
2521 inode->i_mtime = current_time(inode);
2524 case USBDEVFS_DISCSIGNAL32:
2525 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2526 ret = proc_disconnectsignal_compat(ps, p);
2529 case USBDEVFS_SUBMITURB32:
2530 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2531 ret = proc_submiturb_compat(ps, p);
2533 inode->i_mtime = current_time(inode);
2536 case USBDEVFS_IOCTL32:
2537 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2538 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2542 case USBDEVFS_DISCARDURB:
2543 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2544 ret = proc_unlinkurb(ps, p);
2547 case USBDEVFS_DISCSIGNAL:
2548 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2549 ret = proc_disconnectsignal(ps, p);
2552 case USBDEVFS_CLAIMINTERFACE:
2553 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2554 ret = proc_claiminterface(ps, p);
2557 case USBDEVFS_RELEASEINTERFACE:
2558 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2559 ret = proc_releaseinterface(ps, p);
2562 case USBDEVFS_IOCTL:
2563 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2564 ret = proc_ioctl_default(ps, p);
2567 case USBDEVFS_CLAIM_PORT:
2568 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2569 ret = proc_claim_port(ps, p);
2572 case USBDEVFS_RELEASE_PORT:
2573 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2574 ret = proc_release_port(ps, p);
2576 case USBDEVFS_GET_CAPABILITIES:
2577 ret = proc_get_capabilities(ps, p);
2579 case USBDEVFS_DISCONNECT_CLAIM:
2580 ret = proc_disconnect_claim(ps, p);
2582 case USBDEVFS_ALLOC_STREAMS:
2583 ret = proc_alloc_streams(ps, p);
2585 case USBDEVFS_FREE_STREAMS:
2586 ret = proc_free_streams(ps, p);
2588 case USBDEVFS_DROP_PRIVILEGES:
2589 ret = proc_drop_privileges(ps, p);
2594 usb_unlock_device(dev);
2596 inode->i_atime = current_time(inode);
2600 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2605 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2610 #ifdef CONFIG_COMPAT
2611 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2616 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2622 /* No kernel lock - fine */
2623 static unsigned int usbdev_poll(struct file *file,
2624 struct poll_table_struct *wait)
2626 struct usb_dev_state *ps = file->private_data;
2627 unsigned int mask = 0;
2629 poll_wait(file, &ps->wait, wait);
2630 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2631 mask |= POLLOUT | POLLWRNORM;
2634 if (list_empty(&ps->list))
2639 const struct file_operations usbdev_file_operations = {
2640 .owner = THIS_MODULE,
2641 .llseek = no_seek_end_llseek,
2642 .read = usbdev_read,
2643 .poll = usbdev_poll,
2644 .unlocked_ioctl = usbdev_ioctl,
2645 #ifdef CONFIG_COMPAT
2646 .compat_ioctl = usbdev_compat_ioctl,
2648 .mmap = usbdev_mmap,
2649 .open = usbdev_open,
2650 .release = usbdev_release,
2653 static void usbdev_remove(struct usb_device *udev)
2655 struct usb_dev_state *ps;
2656 struct siginfo sinfo;
2658 while (!list_empty(&udev->filelist)) {
2659 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2660 destroy_all_async(ps);
2661 wake_up_all(&ps->wait);
2662 list_del_init(&ps->list);
2663 if (ps->discsignr) {
2664 memset(&sinfo, 0, sizeof(sinfo));
2665 sinfo.si_signo = ps->discsignr;
2666 sinfo.si_errno = EPIPE;
2667 sinfo.si_code = SI_ASYNCIO;
2668 sinfo.si_addr = ps->disccontext;
2669 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2670 ps->disc_pid, ps->cred, ps->secid);
2675 static int usbdev_notify(struct notifier_block *self,
2676 unsigned long action, void *dev)
2679 case USB_DEVICE_ADD:
2681 case USB_DEVICE_REMOVE:
2688 static struct notifier_block usbdev_nb = {
2689 .notifier_call = usbdev_notify,
2692 static struct cdev usb_device_cdev;
2694 int __init usb_devio_init(void)
2698 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2701 printk(KERN_ERR "Unable to register minors for usb_device\n");
2704 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2705 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2707 printk(KERN_ERR "Unable to get usb_device major %d\n",
2711 usb_register_notify(&usbdev_nb);
2716 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2720 void usb_devio_cleanup(void)
2722 usb_unregister_notify(&usbdev_nb);
2723 cdev_del(&usb_device_cdev);
2724 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);