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 <asm/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);
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;
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 aithmetic 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 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 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 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 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 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 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 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 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 sinfo.si_signo = as->signr;
505 sinfo.si_errno = as->status;
506 sinfo.si_code = SI_ASYNCIO;
507 sinfo.si_addr = as->userurb;
508 pid = get_pid(as->pid);
509 cred = get_cred(as->cred);
512 snoop(&urb->dev->dev, "urb complete\n");
513 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
514 as->status, COMPLETE, NULL, 0);
515 if ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_IN)
516 snoop_urb_data(urb, urb->actual_length);
518 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
519 as->status != -ENOENT)
520 cancel_bulk_urbs(ps, as->bulk_addr);
521 spin_unlock(&ps->lock);
524 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
532 static void destroy_async(struct dev_state *ps, struct list_head *list)
538 spin_lock_irqsave(&ps->lock, flags);
539 while (!list_empty(list)) {
540 as = list_entry(list->next, struct async, asynclist);
541 list_del_init(&as->asynclist);
545 /* drop the spinlock so the completion handler can run */
546 spin_unlock_irqrestore(&ps->lock, flags);
549 spin_lock_irqsave(&ps->lock, flags);
551 spin_unlock_irqrestore(&ps->lock, flags);
554 static void destroy_async_on_interface(struct dev_state *ps,
557 struct list_head *p, *q, hitlist;
560 INIT_LIST_HEAD(&hitlist);
561 spin_lock_irqsave(&ps->lock, flags);
562 list_for_each_safe(p, q, &ps->async_pending)
563 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
564 list_move_tail(p, &hitlist);
565 spin_unlock_irqrestore(&ps->lock, flags);
566 destroy_async(ps, &hitlist);
569 static void destroy_all_async(struct dev_state *ps)
571 destroy_async(ps, &ps->async_pending);
575 * interface claims are made only at the request of user level code,
576 * which can also release them (explicitly or by closing files).
577 * they're also undone when devices disconnect.
580 static int driver_probe(struct usb_interface *intf,
581 const struct usb_device_id *id)
586 static void driver_disconnect(struct usb_interface *intf)
588 struct dev_state *ps = usb_get_intfdata(intf);
589 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
594 /* NOTE: this relies on usbcore having canceled and completed
595 * all pending I/O requests; 2.6 does that.
598 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
599 clear_bit(ifnum, &ps->ifclaimed);
601 dev_warn(&intf->dev, "interface number %u out of range\n",
604 usb_set_intfdata(intf, NULL);
606 /* force async requests to complete */
607 destroy_async_on_interface(ps, ifnum);
610 /* The following routines are merely placeholders. There is no way
611 * to inform a user task about suspend or resumes.
613 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
618 static int driver_resume(struct usb_interface *intf)
623 struct usb_driver usbfs_driver = {
625 .probe = driver_probe,
626 .disconnect = driver_disconnect,
627 .suspend = driver_suspend,
628 .resume = driver_resume,
631 static int claimintf(struct dev_state *ps, unsigned int ifnum)
633 struct usb_device *dev = ps->dev;
634 struct usb_interface *intf;
637 if (ifnum >= 8*sizeof(ps->ifclaimed))
639 /* already claimed */
640 if (test_bit(ifnum, &ps->ifclaimed))
643 intf = usb_ifnum_to_if(dev, ifnum);
647 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
649 set_bit(ifnum, &ps->ifclaimed);
653 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
655 struct usb_device *dev;
656 struct usb_interface *intf;
660 if (ifnum >= 8*sizeof(ps->ifclaimed))
663 intf = usb_ifnum_to_if(dev, ifnum);
666 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
667 usb_driver_release_interface(&usbfs_driver, intf);
673 static int checkintf(struct dev_state *ps, unsigned int ifnum)
675 if (ps->dev->state != USB_STATE_CONFIGURED)
676 return -EHOSTUNREACH;
677 if (ifnum >= 8*sizeof(ps->ifclaimed))
679 if (test_bit(ifnum, &ps->ifclaimed))
681 /* if not yet claimed, claim it for the driver */
682 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
683 "interface %u before use\n", task_pid_nr(current),
684 current->comm, ifnum);
685 return claimintf(ps, ifnum);
688 static int findintfep(struct usb_device *dev, unsigned int ep)
690 unsigned int i, j, e;
691 struct usb_interface *intf;
692 struct usb_host_interface *alts;
693 struct usb_endpoint_descriptor *endpt;
695 if (ep & ~(USB_DIR_IN|0xf))
699 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
700 intf = dev->actconfig->interface[i];
701 for (j = 0; j < intf->num_altsetting; j++) {
702 alts = &intf->altsetting[j];
703 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
704 endpt = &alts->endpoint[e].desc;
705 if (endpt->bEndpointAddress == ep)
706 return alts->desc.bInterfaceNumber;
713 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
714 unsigned int request, unsigned int index)
717 struct usb_host_interface *alt_setting;
719 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
720 && ps->dev->state != USB_STATE_ADDRESS
721 && ps->dev->state != USB_STATE_CONFIGURED)
722 return -EHOSTUNREACH;
723 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
727 * check for the special corner case 'get_device_id' in the printer
728 * class specification, where wIndex is (interface << 8 | altsetting)
729 * instead of just interface
731 if (requesttype == 0xa1 && request == 0) {
732 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
733 index >> 8, index & 0xff);
735 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
740 switch (requesttype & USB_RECIP_MASK) {
741 case USB_RECIP_ENDPOINT:
742 if ((index & ~USB_DIR_IN) == 0)
744 ret = findintfep(ps->dev, index);
747 * Some not fully compliant Win apps seem to get
748 * index wrong and have the endpoint number here
749 * rather than the endpoint address (with the
750 * correct direction). Win does let this through,
751 * so we'll not reject it here but leave it to
752 * the device to not break KVM. But we warn.
754 ret = findintfep(ps->dev, index ^ 0x80);
756 dev_info(&ps->dev->dev,
757 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
758 __func__, task_pid_nr(current),
759 current->comm, index, index ^ 0x80);
762 ret = checkintf(ps, ret);
765 case USB_RECIP_INTERFACE:
766 ret = checkintf(ps, index);
772 static int match_devt(struct device *dev, void *data)
774 return dev->devt == (dev_t) (unsigned long) data;
777 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
781 dev = bus_find_device(&usb_bus_type, NULL,
782 (void *) (unsigned long) devt, match_devt);
785 return container_of(dev, struct usb_device, dev);
791 static int usbdev_open(struct inode *inode, struct file *file)
793 struct usb_device *dev = NULL;
794 struct dev_state *ps;
798 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
804 /* Protect against simultaneous removal or release */
805 mutex_lock(&usbfs_mutex);
807 /* usbdev device-node */
808 if (imajor(inode) == USB_DEVICE_MAJOR)
809 dev = usbdev_lookup_by_devt(inode->i_rdev);
811 mutex_unlock(&usbfs_mutex);
816 usb_lock_device(dev);
817 if (dev->state == USB_STATE_NOTATTACHED)
818 goto out_unlock_device;
820 ret = usb_autoresume_device(dev);
822 goto out_unlock_device;
826 spin_lock_init(&ps->lock);
827 INIT_LIST_HEAD(&ps->list);
828 INIT_LIST_HEAD(&ps->async_pending);
829 INIT_LIST_HEAD(&ps->async_completed);
830 init_waitqueue_head(&ps->wait);
832 ps->disc_pid = get_pid(task_pid(current));
833 ps->cred = get_current_cred();
834 ps->disccontext = NULL;
836 security_task_getsecid(current, &ps->secid);
838 list_add_tail(&ps->list, &dev->filelist);
839 file->private_data = ps;
840 usb_unlock_device(dev);
841 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
846 usb_unlock_device(dev);
853 static int usbdev_release(struct inode *inode, struct file *file)
855 struct dev_state *ps = file->private_data;
856 struct usb_device *dev = ps->dev;
860 usb_lock_device(dev);
861 usb_hub_release_all_ports(dev, ps);
863 list_del_init(&ps->list);
865 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
867 if (test_bit(ifnum, &ps->ifclaimed))
868 releaseintf(ps, ifnum);
870 destroy_all_async(ps);
871 usb_autosuspend_device(dev);
872 usb_unlock_device(dev);
874 put_pid(ps->disc_pid);
877 as = async_getcompleted(ps);
880 as = async_getcompleted(ps);
886 static int proc_control(struct dev_state *ps, void __user *arg)
888 struct usb_device *dev = ps->dev;
889 struct usbdevfs_ctrltransfer ctrl;
895 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
897 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
901 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
902 if (wLength > PAGE_SIZE)
904 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
905 sizeof(struct usb_ctrlrequest));
908 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
914 snoop(&dev->dev, "control urb: bRequestType=%02x "
915 "bRequest=%02x wValue=%04x "
916 "wIndex=%04x wLength=%04x\n",
917 ctrl.bRequestType, ctrl.bRequest,
918 __le16_to_cpup(&ctrl.wValue),
919 __le16_to_cpup(&ctrl.wIndex),
920 __le16_to_cpup(&ctrl.wLength));
921 if (ctrl.bRequestType & 0x80) {
922 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
927 pipe = usb_rcvctrlpipe(dev, 0);
928 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
930 usb_unlock_device(dev);
931 i = usb_control_msg(dev, pipe, ctrl.bRequest,
932 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
933 tbuf, ctrl.wLength, tmo);
934 usb_lock_device(dev);
935 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
937 if ((i > 0) && ctrl.wLength) {
938 if (copy_to_user(ctrl.data, tbuf, i)) {
945 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
950 pipe = usb_sndctrlpipe(dev, 0);
951 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
954 usb_unlock_device(dev);
955 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
956 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
957 tbuf, ctrl.wLength, tmo);
958 usb_lock_device(dev);
959 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
961 if (i < 0 && i != -EPIPE) {
962 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
963 "failed cmd %s rqt %u rq %u len %u ret %d\n",
964 current->comm, ctrl.bRequestType, ctrl.bRequest,
969 free_page((unsigned long) tbuf);
970 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
971 sizeof(struct usb_ctrlrequest));
975 static int proc_bulk(struct dev_state *ps, void __user *arg)
977 struct usb_device *dev = ps->dev;
978 struct usbdevfs_bulktransfer bulk;
979 unsigned int tmo, len1, pipe;
984 if (copy_from_user(&bulk, arg, sizeof(bulk)))
986 ret = findintfep(ps->dev, bulk.ep);
989 ret = checkintf(ps, ret);
992 if (bulk.ep & USB_DIR_IN)
993 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
995 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
996 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
999 if (len1 >= USBFS_XFER_MAX)
1001 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1004 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
1009 if (bulk.ep & 0x80) {
1010 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1014 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1016 usb_unlock_device(dev);
1017 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1018 usb_lock_device(dev);
1019 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1022 if (copy_to_user(bulk.data, tbuf, len2)) {
1029 if (copy_from_user(tbuf, bulk.data, len1)) {
1034 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1036 usb_unlock_device(dev);
1037 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1038 usb_lock_device(dev);
1039 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1041 ret = (i < 0 ? i : len2);
1044 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1048 static int proc_resetep(struct dev_state *ps, void __user *arg)
1053 if (get_user(ep, (unsigned int __user *)arg))
1055 ret = findintfep(ps->dev, ep);
1058 ret = checkintf(ps, ret);
1061 usb_reset_endpoint(ps->dev, ep);
1065 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
1071 if (get_user(ep, (unsigned int __user *)arg))
1073 ret = findintfep(ps->dev, ep);
1076 ret = checkintf(ps, ret);
1079 if (ep & USB_DIR_IN)
1080 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1082 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1084 return usb_clear_halt(ps->dev, pipe);
1087 static int proc_getdriver(struct dev_state *ps, void __user *arg)
1089 struct usbdevfs_getdriver gd;
1090 struct usb_interface *intf;
1093 if (copy_from_user(&gd, arg, sizeof(gd)))
1095 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1096 if (!intf || !intf->dev.driver)
1099 strlcpy(gd.driver, intf->dev.driver->name,
1101 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1106 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1108 struct usbdevfs_connectinfo ci = {
1109 .devnum = ps->dev->devnum,
1110 .slow = ps->dev->speed == USB_SPEED_LOW
1113 if (copy_to_user(arg, &ci, sizeof(ci)))
1118 static int proc_resetdevice(struct dev_state *ps)
1120 return usb_reset_device(ps->dev);
1123 static int proc_setintf(struct dev_state *ps, void __user *arg)
1125 struct usbdevfs_setinterface setintf;
1128 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1130 if ((ret = checkintf(ps, setintf.interface)))
1132 return usb_set_interface(ps->dev, setintf.interface,
1133 setintf.altsetting);
1136 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1140 struct usb_host_config *actconfig;
1142 if (get_user(u, (int __user *)arg))
1145 actconfig = ps->dev->actconfig;
1147 /* Don't touch the device if any interfaces are claimed.
1148 * It could interfere with other drivers' operations, and if
1149 * an interface is claimed by usbfs it could easily deadlock.
1154 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1155 if (usb_interface_claimed(actconfig->interface[i])) {
1156 dev_warn(&ps->dev->dev,
1157 "usbfs: interface %d claimed by %s "
1158 "while '%s' sets config #%d\n",
1159 actconfig->interface[i]
1161 ->desc.bInterfaceNumber,
1162 actconfig->interface[i]
1171 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1172 * so avoid usb_set_configuration()'s kick to sysfs
1175 if (actconfig && actconfig->desc.bConfigurationValue == u)
1176 status = usb_reset_configuration(ps->dev);
1178 status = usb_set_configuration(ps->dev, u);
1184 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1185 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1188 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1189 struct usb_host_endpoint *ep;
1190 struct async *as = NULL;
1191 struct usb_ctrlrequest *dr = NULL;
1192 unsigned int u, totlen, isofrmlen;
1193 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1196 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1197 USBDEVFS_URB_SHORT_NOT_OK |
1198 USBDEVFS_URB_BULK_CONTINUATION |
1199 USBDEVFS_URB_NO_FSBR |
1200 USBDEVFS_URB_ZERO_PACKET |
1201 USBDEVFS_URB_NO_INTERRUPT))
1203 if (uurb->buffer_length > 0 && !uurb->buffer)
1205 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1206 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1207 ifnum = findintfep(ps->dev, uurb->endpoint);
1210 ret = checkintf(ps, ifnum);
1214 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1216 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1219 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1225 switch(uurb->type) {
1226 case USBDEVFS_URB_TYPE_CONTROL:
1227 if (!usb_endpoint_xfer_control(&ep->desc))
1229 /* min 8 byte setup packet */
1230 if (uurb->buffer_length < 8)
1232 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1235 if (copy_from_user(dr, uurb->buffer, 8)) {
1239 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1243 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1244 le16_to_cpup(&dr->wIndex));
1247 uurb->number_of_packets = 0;
1248 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1250 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1252 uurb->endpoint |= USB_DIR_IN;
1255 uurb->endpoint &= ~USB_DIR_IN;
1257 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1258 "bRequest=%02x wValue=%04x "
1259 "wIndex=%04x wLength=%04x\n",
1260 dr->bRequestType, dr->bRequest,
1261 __le16_to_cpup(&dr->wValue),
1262 __le16_to_cpup(&dr->wIndex),
1263 __le16_to_cpup(&dr->wLength));
1264 u = sizeof(struct usb_ctrlrequest);
1267 case USBDEVFS_URB_TYPE_BULK:
1268 switch (usb_endpoint_type(&ep->desc)) {
1269 case USB_ENDPOINT_XFER_CONTROL:
1270 case USB_ENDPOINT_XFER_ISOC:
1272 case USB_ENDPOINT_XFER_INT:
1273 /* allow single-shot interrupt transfers */
1274 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1277 uurb->number_of_packets = 0;
1278 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1279 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1283 case USBDEVFS_URB_TYPE_INTERRUPT:
1284 if (!usb_endpoint_xfer_int(&ep->desc))
1287 uurb->number_of_packets = 0;
1290 case USBDEVFS_URB_TYPE_ISO:
1291 /* arbitrary limit */
1292 if (uurb->number_of_packets < 1 ||
1293 uurb->number_of_packets > 128)
1295 if (!usb_endpoint_xfer_isoc(&ep->desc))
1297 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1298 uurb->number_of_packets;
1299 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1301 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1305 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1307 * arbitrary limit need for USB 3.0
1308 * bMaxBurst (0~15 allowed, 1~16 packets)
1309 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1310 * sizemax: 1024 * 16 * 3 = 49152
1312 if (isopkt[u].length > 49152) {
1316 totlen += isopkt[u].length;
1318 u *= sizeof(struct usb_iso_packet_descriptor);
1319 uurb->buffer_length = totlen;
1326 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1330 if (uurb->buffer_length > 0 &&
1331 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1332 uurb->buffer, uurb->buffer_length)) {
1336 as = alloc_async(uurb->number_of_packets);
1342 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1343 num_sgs * sizeof(struct scatterlist);
1344 ret = usbfs_increase_memory_usage(u);
1350 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1356 as->urb->num_sgs = num_sgs;
1357 sg_init_table(as->urb->sg, as->urb->num_sgs);
1359 totlen = uurb->buffer_length;
1360 for (i = 0; i < as->urb->num_sgs; i++) {
1361 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1362 buf = kmalloc(u, GFP_KERNEL);
1367 sg_set_buf(&as->urb->sg[i], buf, u);
1370 if (copy_from_user(buf, uurb->buffer, u)) {
1378 } else if (uurb->buffer_length > 0) {
1379 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1381 if (!as->urb->transfer_buffer) {
1387 if (copy_from_user(as->urb->transfer_buffer,
1389 uurb->buffer_length)) {
1393 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1395 * Isochronous input data may end up being
1396 * discontiguous if some of the packets are short.
1397 * Clear the buffer so that the gaps don't leak
1398 * kernel data to userspace.
1400 memset(as->urb->transfer_buffer, 0,
1401 uurb->buffer_length);
1404 as->urb->dev = ps->dev;
1405 as->urb->pipe = (uurb->type << 30) |
1406 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1407 (uurb->endpoint & USB_DIR_IN);
1409 /* This tedious sequence is necessary because the URB_* flags
1410 * are internal to the kernel and subject to change, whereas
1411 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1413 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1414 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1416 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1417 u |= URB_SHORT_NOT_OK;
1418 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1420 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1421 u |= URB_ZERO_PACKET;
1422 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1423 u |= URB_NO_INTERRUPT;
1424 as->urb->transfer_flags = u;
1426 as->urb->transfer_buffer_length = uurb->buffer_length;
1427 as->urb->setup_packet = (unsigned char *)dr;
1429 as->urb->start_frame = uurb->start_frame;
1430 as->urb->number_of_packets = uurb->number_of_packets;
1431 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1432 ps->dev->speed == USB_SPEED_HIGH)
1433 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1435 as->urb->interval = ep->desc.bInterval;
1436 as->urb->context = as;
1437 as->urb->complete = async_completed;
1438 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1439 as->urb->iso_frame_desc[u].offset = totlen;
1440 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1441 totlen += isopkt[u].length;
1447 if (is_in && uurb->buffer_length > 0)
1448 as->userbuffer = uurb->buffer;
1450 as->userbuffer = NULL;
1451 as->signr = uurb->signr;
1453 as->pid = get_pid(task_pid(current));
1454 as->cred = get_current_cred();
1455 security_task_getsecid(current, &as->secid);
1456 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1457 as->urb->transfer_buffer_length, 0, SUBMIT,
1460 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1462 async_newpending(as);
1464 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1465 spin_lock_irq(&ps->lock);
1467 /* Not exactly the endpoint address; the direction bit is
1468 * shifted to the 0x10 position so that the value will be
1471 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1472 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1475 /* If this bulk URB is the start of a new transfer, re-enable
1476 * the endpoint. Otherwise mark it as a continuation URB.
1478 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1479 as->bulk_status = AS_CONTINUATION;
1481 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1483 /* Don't accept continuation URBs if the endpoint is
1484 * disabled because of an earlier error.
1486 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1489 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1490 spin_unlock_irq(&ps->lock);
1492 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1496 dev_printk(KERN_DEBUG, &ps->dev->dev,
1497 "usbfs: usb_submit_urb returned %d\n", ret);
1498 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1499 0, ret, COMPLETE, NULL, 0);
1500 async_removepending(as);
1513 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1515 struct usbdevfs_urb uurb;
1517 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1520 return proc_do_submiturb(ps, &uurb,
1521 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1525 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1529 unsigned long flags;
1531 spin_lock_irqsave(&ps->lock, flags);
1532 as = async_getpending(ps, arg);
1534 spin_unlock_irqrestore(&ps->lock, flags);
1540 spin_unlock_irqrestore(&ps->lock, flags);
1548 static int processcompl(struct async *as, void __user * __user *arg)
1550 struct urb *urb = as->urb;
1551 struct usbdevfs_urb __user *userurb = as->userurb;
1552 void __user *addr = as->userurb;
1555 if (as->userbuffer && urb->actual_length) {
1556 if (copy_urb_data_to_user(as->userbuffer, urb))
1559 if (put_user(as->status, &userurb->status))
1561 if (put_user(urb->actual_length, &userurb->actual_length))
1563 if (put_user(urb->error_count, &userurb->error_count))
1566 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1567 for (i = 0; i < urb->number_of_packets; i++) {
1568 if (put_user(urb->iso_frame_desc[i].actual_length,
1569 &userurb->iso_frame_desc[i].actual_length))
1571 if (put_user(urb->iso_frame_desc[i].status,
1572 &userurb->iso_frame_desc[i].status))
1577 if (put_user(addr, (void __user * __user *)arg))
1585 static struct async *reap_as(struct dev_state *ps)
1587 DECLARE_WAITQUEUE(wait, current);
1588 struct async *as = NULL;
1589 struct usb_device *dev = ps->dev;
1591 add_wait_queue(&ps->wait, &wait);
1593 __set_current_state(TASK_INTERRUPTIBLE);
1594 as = async_getcompleted(ps);
1597 if (signal_pending(current))
1599 usb_unlock_device(dev);
1601 usb_lock_device(dev);
1603 remove_wait_queue(&ps->wait, &wait);
1604 set_current_state(TASK_RUNNING);
1608 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1610 struct async *as = reap_as(ps);
1612 int retval = processcompl(as, (void __user * __user *)arg);
1616 if (signal_pending(current))
1621 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1626 as = async_getcompleted(ps);
1629 retval = processcompl(as, (void __user * __user *)arg);
1635 #ifdef CONFIG_COMPAT
1636 static int proc_control_compat(struct dev_state *ps,
1637 struct usbdevfs_ctrltransfer32 __user *p32)
1639 struct usbdevfs_ctrltransfer __user *p;
1641 p = compat_alloc_user_space(sizeof(*p));
1642 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1643 get_user(udata, &p32->data) ||
1644 put_user(compat_ptr(udata), &p->data))
1646 return proc_control(ps, p);
1649 static int proc_bulk_compat(struct dev_state *ps,
1650 struct usbdevfs_bulktransfer32 __user *p32)
1652 struct usbdevfs_bulktransfer __user *p;
1654 compat_caddr_t addr;
1656 p = compat_alloc_user_space(sizeof(*p));
1658 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1659 get_user(n, &p32->len) || put_user(n, &p->len) ||
1660 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1661 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1664 return proc_bulk(ps, p);
1666 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1668 struct usbdevfs_disconnectsignal32 ds;
1670 if (copy_from_user(&ds, arg, sizeof(ds)))
1672 ps->discsignr = ds.signr;
1673 ps->disccontext = compat_ptr(ds.context);
1677 static int get_urb32(struct usbdevfs_urb *kurb,
1678 struct usbdevfs_urb32 __user *uurb)
1681 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1682 __get_user(kurb->type, &uurb->type) ||
1683 __get_user(kurb->endpoint, &uurb->endpoint) ||
1684 __get_user(kurb->status, &uurb->status) ||
1685 __get_user(kurb->flags, &uurb->flags) ||
1686 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1687 __get_user(kurb->actual_length, &uurb->actual_length) ||
1688 __get_user(kurb->start_frame, &uurb->start_frame) ||
1689 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1690 __get_user(kurb->error_count, &uurb->error_count) ||
1691 __get_user(kurb->signr, &uurb->signr))
1694 if (__get_user(uptr, &uurb->buffer))
1696 kurb->buffer = compat_ptr(uptr);
1697 if (__get_user(uptr, &uurb->usercontext))
1699 kurb->usercontext = compat_ptr(uptr);
1704 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1706 struct usbdevfs_urb uurb;
1708 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1711 return proc_do_submiturb(ps, &uurb,
1712 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1716 static int processcompl_compat(struct async *as, void __user * __user *arg)
1718 struct urb *urb = as->urb;
1719 struct usbdevfs_urb32 __user *userurb = as->userurb;
1720 void __user *addr = as->userurb;
1723 if (as->userbuffer && urb->actual_length) {
1724 if (copy_urb_data_to_user(as->userbuffer, urb))
1727 if (put_user(as->status, &userurb->status))
1729 if (put_user(urb->actual_length, &userurb->actual_length))
1731 if (put_user(urb->error_count, &userurb->error_count))
1734 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1735 for (i = 0; i < urb->number_of_packets; i++) {
1736 if (put_user(urb->iso_frame_desc[i].actual_length,
1737 &userurb->iso_frame_desc[i].actual_length))
1739 if (put_user(urb->iso_frame_desc[i].status,
1740 &userurb->iso_frame_desc[i].status))
1745 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1750 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1752 struct async *as = reap_as(ps);
1754 int retval = processcompl_compat(as, (void __user * __user *)arg);
1758 if (signal_pending(current))
1763 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1769 as = async_getcompleted(ps);
1771 retval = processcompl_compat(as, (void __user * __user *)arg);
1780 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1782 struct usbdevfs_disconnectsignal ds;
1784 if (copy_from_user(&ds, arg, sizeof(ds)))
1786 ps->discsignr = ds.signr;
1787 ps->disccontext = ds.context;
1791 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1795 if (get_user(ifnum, (unsigned int __user *)arg))
1797 return claimintf(ps, ifnum);
1800 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1805 if (get_user(ifnum, (unsigned int __user *)arg))
1807 if ((ret = releaseintf(ps, ifnum)) < 0)
1809 destroy_async_on_interface (ps, ifnum);
1813 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1818 struct usb_interface *intf = NULL;
1819 struct usb_driver *driver = NULL;
1822 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1823 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1825 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1826 if (copy_from_user(buf, ctl->data, size)) {
1831 memset(buf, 0, size);
1835 if (!connected(ps)) {
1840 if (ps->dev->state != USB_STATE_CONFIGURED)
1841 retval = -EHOSTUNREACH;
1842 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1844 else switch (ctl->ioctl_code) {
1846 /* disconnect kernel driver from interface */
1847 case USBDEVFS_DISCONNECT:
1848 if (intf->dev.driver) {
1849 driver = to_usb_driver(intf->dev.driver);
1850 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1851 usb_driver_release_interface(driver, intf);
1856 /* let kernel drivers try to (re)bind to the interface */
1857 case USBDEVFS_CONNECT:
1858 if (!intf->dev.driver)
1859 retval = device_attach(&intf->dev);
1864 /* talk directly to the interface's driver */
1866 if (intf->dev.driver)
1867 driver = to_usb_driver(intf->dev.driver);
1868 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1871 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1872 if (retval == -ENOIOCTLCMD)
1877 /* cleanup and return */
1879 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1881 && copy_to_user(ctl->data, buf, size) != 0)
1888 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1890 struct usbdevfs_ioctl ctrl;
1892 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1894 return proc_ioctl(ps, &ctrl);
1897 #ifdef CONFIG_COMPAT
1898 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1900 struct usbdevfs_ioctl32 __user *uioc;
1901 struct usbdevfs_ioctl ctrl;
1904 uioc = compat_ptr((long)arg);
1905 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1906 __get_user(ctrl.ifno, &uioc->ifno) ||
1907 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1908 __get_user(udata, &uioc->data))
1910 ctrl.data = compat_ptr(udata);
1912 return proc_ioctl(ps, &ctrl);
1916 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1921 if (get_user(portnum, (unsigned __user *) arg))
1923 rc = usb_hub_claim_port(ps->dev, portnum, ps);
1925 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1926 portnum, task_pid_nr(current), current->comm);
1930 static int proc_release_port(struct dev_state *ps, void __user *arg)
1934 if (get_user(portnum, (unsigned __user *) arg))
1936 return usb_hub_release_port(ps->dev, portnum, ps);
1939 static int proc_get_capabilities(struct dev_state *ps, void __user *arg)
1943 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM;
1944 if (!ps->dev->bus->no_stop_on_short)
1945 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
1946 if (ps->dev->bus->sg_tablesize)
1947 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
1949 if (put_user(caps, (__u32 __user *)arg))
1955 static int proc_disconnect_claim(struct dev_state *ps, void __user *arg)
1957 struct usbdevfs_disconnect_claim dc;
1958 struct usb_interface *intf;
1960 if (copy_from_user(&dc, arg, sizeof(dc)))
1963 intf = usb_ifnum_to_if(ps->dev, dc.interface);
1967 if (intf->dev.driver) {
1968 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
1970 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
1971 strncmp(dc.driver, intf->dev.driver->name,
1972 sizeof(dc.driver)) != 0)
1975 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
1976 strncmp(dc.driver, intf->dev.driver->name,
1977 sizeof(dc.driver)) == 0)
1980 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1981 usb_driver_release_interface(driver, intf);
1984 return claimintf(ps, dc.interface);
1988 * NOTE: All requests here that have interface numbers as parameters
1989 * are assuming that somehow the configuration has been prevented from
1990 * changing. But there's no mechanism to ensure that...
1992 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1995 struct dev_state *ps = file->private_data;
1996 struct inode *inode = file_inode(file);
1997 struct usb_device *dev = ps->dev;
2000 if (!(file->f_mode & FMODE_WRITE))
2003 usb_lock_device(dev);
2004 if (!connected(ps)) {
2005 usb_unlock_device(dev);
2010 case USBDEVFS_CONTROL:
2011 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2012 ret = proc_control(ps, p);
2014 inode->i_mtime = CURRENT_TIME;
2018 snoop(&dev->dev, "%s: BULK\n", __func__);
2019 ret = proc_bulk(ps, p);
2021 inode->i_mtime = CURRENT_TIME;
2024 case USBDEVFS_RESETEP:
2025 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2026 ret = proc_resetep(ps, p);
2028 inode->i_mtime = CURRENT_TIME;
2031 case USBDEVFS_RESET:
2032 snoop(&dev->dev, "%s: RESET\n", __func__);
2033 ret = proc_resetdevice(ps);
2036 case USBDEVFS_CLEAR_HALT:
2037 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2038 ret = proc_clearhalt(ps, p);
2040 inode->i_mtime = CURRENT_TIME;
2043 case USBDEVFS_GETDRIVER:
2044 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2045 ret = proc_getdriver(ps, p);
2048 case USBDEVFS_CONNECTINFO:
2049 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2050 ret = proc_connectinfo(ps, p);
2053 case USBDEVFS_SETINTERFACE:
2054 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2055 ret = proc_setintf(ps, p);
2058 case USBDEVFS_SETCONFIGURATION:
2059 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2060 ret = proc_setconfig(ps, p);
2063 case USBDEVFS_SUBMITURB:
2064 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2065 ret = proc_submiturb(ps, p);
2067 inode->i_mtime = CURRENT_TIME;
2070 #ifdef CONFIG_COMPAT
2071 case USBDEVFS_CONTROL32:
2072 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2073 ret = proc_control_compat(ps, p);
2075 inode->i_mtime = CURRENT_TIME;
2078 case USBDEVFS_BULK32:
2079 snoop(&dev->dev, "%s: BULK32\n", __func__);
2080 ret = proc_bulk_compat(ps, p);
2082 inode->i_mtime = CURRENT_TIME;
2085 case USBDEVFS_DISCSIGNAL32:
2086 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2087 ret = proc_disconnectsignal_compat(ps, p);
2090 case USBDEVFS_SUBMITURB32:
2091 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2092 ret = proc_submiturb_compat(ps, p);
2094 inode->i_mtime = CURRENT_TIME;
2097 case USBDEVFS_REAPURB32:
2098 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2099 ret = proc_reapurb_compat(ps, p);
2102 case USBDEVFS_REAPURBNDELAY32:
2103 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2104 ret = proc_reapurbnonblock_compat(ps, p);
2107 case USBDEVFS_IOCTL32:
2108 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2109 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2113 case USBDEVFS_DISCARDURB:
2114 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2115 ret = proc_unlinkurb(ps, p);
2118 case USBDEVFS_REAPURB:
2119 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2120 ret = proc_reapurb(ps, p);
2123 case USBDEVFS_REAPURBNDELAY:
2124 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2125 ret = proc_reapurbnonblock(ps, p);
2128 case USBDEVFS_DISCSIGNAL:
2129 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2130 ret = proc_disconnectsignal(ps, p);
2133 case USBDEVFS_CLAIMINTERFACE:
2134 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2135 ret = proc_claiminterface(ps, p);
2138 case USBDEVFS_RELEASEINTERFACE:
2139 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2140 ret = proc_releaseinterface(ps, p);
2143 case USBDEVFS_IOCTL:
2144 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2145 ret = proc_ioctl_default(ps, p);
2148 case USBDEVFS_CLAIM_PORT:
2149 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2150 ret = proc_claim_port(ps, p);
2153 case USBDEVFS_RELEASE_PORT:
2154 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2155 ret = proc_release_port(ps, p);
2157 case USBDEVFS_GET_CAPABILITIES:
2158 ret = proc_get_capabilities(ps, p);
2160 case USBDEVFS_DISCONNECT_CLAIM:
2161 ret = proc_disconnect_claim(ps, p);
2164 usb_unlock_device(dev);
2166 inode->i_atime = CURRENT_TIME;
2170 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2175 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2180 #ifdef CONFIG_COMPAT
2181 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2186 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2192 /* No kernel lock - fine */
2193 static unsigned int usbdev_poll(struct file *file,
2194 struct poll_table_struct *wait)
2196 struct dev_state *ps = file->private_data;
2197 unsigned int mask = 0;
2199 poll_wait(file, &ps->wait, wait);
2200 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2201 mask |= POLLOUT | POLLWRNORM;
2203 mask |= POLLERR | POLLHUP;
2207 const struct file_operations usbdev_file_operations = {
2208 .owner = THIS_MODULE,
2209 .llseek = usbdev_lseek,
2210 .read = usbdev_read,
2211 .poll = usbdev_poll,
2212 .unlocked_ioctl = usbdev_ioctl,
2213 #ifdef CONFIG_COMPAT
2214 .compat_ioctl = usbdev_compat_ioctl,
2216 .open = usbdev_open,
2217 .release = usbdev_release,
2220 static void usbdev_remove(struct usb_device *udev)
2222 struct dev_state *ps;
2223 struct siginfo sinfo;
2225 while (!list_empty(&udev->filelist)) {
2226 ps = list_entry(udev->filelist.next, struct dev_state, list);
2227 destroy_all_async(ps);
2228 wake_up_all(&ps->wait);
2229 list_del_init(&ps->list);
2230 if (ps->discsignr) {
2231 sinfo.si_signo = ps->discsignr;
2232 sinfo.si_errno = EPIPE;
2233 sinfo.si_code = SI_ASYNCIO;
2234 sinfo.si_addr = ps->disccontext;
2235 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2236 ps->disc_pid, ps->cred, ps->secid);
2241 static int usbdev_notify(struct notifier_block *self,
2242 unsigned long action, void *dev)
2245 case USB_DEVICE_ADD:
2247 case USB_DEVICE_REMOVE:
2254 static struct notifier_block usbdev_nb = {
2255 .notifier_call = usbdev_notify,
2258 static struct cdev usb_device_cdev;
2260 int __init usb_devio_init(void)
2264 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2267 printk(KERN_ERR "Unable to register minors for usb_device\n");
2270 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2271 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2273 printk(KERN_ERR "Unable to get usb_device major %d\n",
2277 usb_register_notify(&usbdev_nb);
2282 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2286 void usb_devio_cleanup(void)
2288 usb_unregister_notify(&usbdev_nb);
2289 cdev_del(&usb_device_cdev);
2290 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);