2 * Copyright (c) 2001 Paul Stewart
3 * Copyright (c) 2001 Vojtech Pavlik
5 * HID char devices, giving access to raw HID device events.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 * Should you need to contact me, the author, you can do so either by
25 * e-mail - mail your message to Paul Stewart <stewart@wetlogic.net>
28 #include <linux/poll.h>
29 #include <linux/slab.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/smp_lock.h>
33 #include <linux/input.h>
34 #include <linux/usb.h>
35 #include <linux/hid.h>
36 #include <linux/hiddev.h>
37 #include <linux/compat.h>
40 #ifdef CONFIG_USB_DYNAMIC_MINORS
41 #define HIDDEV_MINOR_BASE 0
42 #define HIDDEV_MINORS 256
44 #define HIDDEV_MINOR_BASE 96
45 #define HIDDEV_MINORS 16
47 #define HIDDEV_BUFFER_SIZE 2048
52 struct mutex existancelock
;
53 wait_queue_head_t wait
;
54 struct hid_device
*hid
;
55 struct list_head list
;
60 struct hiddev_usage_ref buffer
[HIDDEV_BUFFER_SIZE
];
64 struct fasync_struct
*fasync
;
65 struct hiddev
*hiddev
;
66 struct list_head node
;
67 struct mutex thread_lock
;
71 * Find a report, given the report's type and ID. The ID can be specified
72 * indirectly by REPORT_ID_FIRST (which returns the first report of the given
73 * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the
74 * given type which follows old_id.
76 static struct hid_report
*
77 hiddev_lookup_report(struct hid_device
*hid
, struct hiddev_report_info
*rinfo
)
79 unsigned int flags
= rinfo
->report_id
& ~HID_REPORT_ID_MASK
;
80 unsigned int rid
= rinfo
->report_id
& HID_REPORT_ID_MASK
;
81 struct hid_report_enum
*report_enum
;
82 struct hid_report
*report
;
83 struct list_head
*list
;
85 if (rinfo
->report_type
< HID_REPORT_TYPE_MIN
||
86 rinfo
->report_type
> HID_REPORT_TYPE_MAX
)
89 report_enum
= hid
->report_enum
+
90 (rinfo
->report_type
- HID_REPORT_TYPE_MIN
);
93 case 0: /* Nothing to do -- report_id is already set correctly */
96 case HID_REPORT_ID_FIRST
:
97 if (list_empty(&report_enum
->report_list
))
100 list
= report_enum
->report_list
.next
;
101 report
= list_entry(list
, struct hid_report
, list
);
102 rinfo
->report_id
= report
->id
;
105 case HID_REPORT_ID_NEXT
:
106 report
= report_enum
->report_id_hash
[rid
];
110 list
= report
->list
.next
;
111 if (list
== &report_enum
->report_list
)
114 report
= list_entry(list
, struct hid_report
, list
);
115 rinfo
->report_id
= report
->id
;
122 return report_enum
->report_id_hash
[rinfo
->report_id
];
126 * Perform an exhaustive search of the report table for a usage, given its
129 static struct hid_field
*
130 hiddev_lookup_usage(struct hid_device
*hid
, struct hiddev_usage_ref
*uref
)
133 struct hid_report
*report
;
134 struct hid_report_enum
*report_enum
;
135 struct hid_field
*field
;
137 if (uref
->report_type
< HID_REPORT_TYPE_MIN
||
138 uref
->report_type
> HID_REPORT_TYPE_MAX
)
141 report_enum
= hid
->report_enum
+
142 (uref
->report_type
- HID_REPORT_TYPE_MIN
);
144 list_for_each_entry(report
, &report_enum
->report_list
, list
) {
145 for (i
= 0; i
< report
->maxfield
; i
++) {
146 field
= report
->field
[i
];
147 for (j
= 0; j
< field
->maxusage
; j
++) {
148 if (field
->usage
[j
].hid
== uref
->usage_code
) {
149 uref
->report_id
= report
->id
;
150 uref
->field_index
= i
;
151 uref
->usage_index
= j
;
161 static void hiddev_send_event(struct hid_device
*hid
,
162 struct hiddev_usage_ref
*uref
)
164 struct hiddev
*hiddev
= hid
->hiddev
;
165 struct hiddev_list
*list
;
168 spin_lock_irqsave(&hiddev
->list_lock
, flags
);
169 list_for_each_entry(list
, &hiddev
->list
, node
) {
170 if (uref
->field_index
!= HID_FIELD_INDEX_NONE
||
171 (list
->flags
& HIDDEV_FLAG_REPORT
) != 0) {
172 list
->buffer
[list
->head
] = *uref
;
173 list
->head
= (list
->head
+ 1) &
174 (HIDDEV_BUFFER_SIZE
- 1);
175 kill_fasync(&list
->fasync
, SIGIO
, POLL_IN
);
178 spin_unlock_irqrestore(&hiddev
->list_lock
, flags
);
180 wake_up_interruptible(&hiddev
->wait
);
184 * This is where hid.c calls into hiddev to pass an event that occurred over
187 void hiddev_hid_event(struct hid_device
*hid
, struct hid_field
*field
,
188 struct hid_usage
*usage
, __s32 value
)
190 unsigned type
= field
->report_type
;
191 struct hiddev_usage_ref uref
;
194 (type
== HID_INPUT_REPORT
) ? HID_REPORT_TYPE_INPUT
:
195 ((type
== HID_OUTPUT_REPORT
) ? HID_REPORT_TYPE_OUTPUT
:
196 ((type
== HID_FEATURE_REPORT
) ? HID_REPORT_TYPE_FEATURE
: 0));
197 uref
.report_id
= field
->report
->id
;
198 uref
.field_index
= field
->index
;
199 uref
.usage_index
= (usage
- field
->usage
);
200 uref
.usage_code
= usage
->hid
;
203 hiddev_send_event(hid
, &uref
);
205 EXPORT_SYMBOL_GPL(hiddev_hid_event
);
207 void hiddev_report_event(struct hid_device
*hid
, struct hid_report
*report
)
209 unsigned type
= report
->type
;
210 struct hiddev_usage_ref uref
;
212 memset(&uref
, 0, sizeof(uref
));
214 (type
== HID_INPUT_REPORT
) ? HID_REPORT_TYPE_INPUT
:
215 ((type
== HID_OUTPUT_REPORT
) ? HID_REPORT_TYPE_OUTPUT
:
216 ((type
== HID_FEATURE_REPORT
) ? HID_REPORT_TYPE_FEATURE
: 0));
217 uref
.report_id
= report
->id
;
218 uref
.field_index
= HID_FIELD_INDEX_NONE
;
220 hiddev_send_event(hid
, &uref
);
226 static int hiddev_fasync(int fd
, struct file
*file
, int on
)
228 struct hiddev_list
*list
= file
->private_data
;
230 return fasync_helper(fd
, file
, on
, &list
->fasync
);
237 static int hiddev_release(struct inode
* inode
, struct file
* file
)
239 struct hiddev_list
*list
= file
->private_data
;
242 spin_lock_irqsave(&list
->hiddev
->list_lock
, flags
);
243 list_del(&list
->node
);
244 spin_unlock_irqrestore(&list
->hiddev
->list_lock
, flags
);
246 if (!--list
->hiddev
->open
) {
247 if (list
->hiddev
->exist
) {
248 usbhid_close(list
->hiddev
->hid
);
249 usbhid_put_power(list
->hiddev
->hid
);
263 static int hiddev_open(struct inode
*inode
, struct file
*file
)
265 struct hiddev_list
*list
;
266 struct usb_interface
*intf
;
267 struct hid_device
*hid
;
268 struct hiddev
*hiddev
;
271 intf
= usbhid_find_interface(iminor(inode
));
274 hid
= usb_get_intfdata(intf
);
275 hiddev
= hid
->hiddev
;
277 if (!(list
= kzalloc(sizeof(struct hiddev_list
), GFP_KERNEL
)))
279 mutex_init(&list
->thread_lock
);
280 list
->hiddev
= hiddev
;
281 file
->private_data
= list
;
284 * no need for locking because the USB major number
285 * is shared which usbcore guards against disconnect
287 if (list
->hiddev
->exist
) {
288 if (!list
->hiddev
->open
++) {
289 res
= usbhid_open(hiddev
->hid
);
300 spin_lock_irq(&list
->hiddev
->list_lock
);
301 list_add_tail(&list
->node
, &hiddev
->list
);
302 spin_unlock_irq(&list
->hiddev
->list_lock
);
304 if (!list
->hiddev
->open
++)
305 if (list
->hiddev
->exist
) {
306 struct hid_device
*hid
= hiddev
->hid
;
307 res
= usbhid_get_power(hid
);
316 file
->private_data
= NULL
;
324 static ssize_t
hiddev_write(struct file
* file
, const char __user
* buffer
, size_t count
, loff_t
*ppos
)
332 static ssize_t
hiddev_read(struct file
* file
, char __user
* buffer
, size_t count
, loff_t
*ppos
)
335 struct hiddev_list
*list
= file
->private_data
;
339 event_size
= ((list
->flags
& HIDDEV_FLAG_UREF
) != 0) ?
340 sizeof(struct hiddev_usage_ref
) : sizeof(struct hiddev_event
);
342 if (count
< event_size
)
345 /* lock against other threads */
346 retval
= mutex_lock_interruptible(&list
->thread_lock
);
350 while (retval
== 0) {
351 if (list
->head
== list
->tail
) {
352 prepare_to_wait(&list
->hiddev
->wait
, &wait
, TASK_INTERRUPTIBLE
);
354 while (list
->head
== list
->tail
) {
355 if (file
->f_flags
& O_NONBLOCK
) {
359 if (signal_pending(current
)) {
360 retval
= -ERESTARTSYS
;
363 if (!list
->hiddev
->exist
) {
368 /* let O_NONBLOCK tasks run */
369 mutex_unlock(&list
->thread_lock
);
371 if (mutex_lock_interruptible(&list
->thread_lock
))
373 set_current_state(TASK_INTERRUPTIBLE
);
375 finish_wait(&list
->hiddev
->wait
, &wait
);
380 mutex_unlock(&list
->thread_lock
);
385 while (list
->head
!= list
->tail
&&
386 retval
+ event_size
<= count
) {
387 if ((list
->flags
& HIDDEV_FLAG_UREF
) == 0) {
388 if (list
->buffer
[list
->tail
].field_index
!= HID_FIELD_INDEX_NONE
) {
389 struct hiddev_event event
;
391 event
.hid
= list
->buffer
[list
->tail
].usage_code
;
392 event
.value
= list
->buffer
[list
->tail
].value
;
393 if (copy_to_user(buffer
+ retval
, &event
, sizeof(struct hiddev_event
))) {
394 mutex_unlock(&list
->thread_lock
);
397 retval
+= sizeof(struct hiddev_event
);
400 if (list
->buffer
[list
->tail
].field_index
!= HID_FIELD_INDEX_NONE
||
401 (list
->flags
& HIDDEV_FLAG_REPORT
) != 0) {
403 if (copy_to_user(buffer
+ retval
, list
->buffer
+ list
->tail
, sizeof(struct hiddev_usage_ref
))) {
404 mutex_unlock(&list
->thread_lock
);
407 retval
+= sizeof(struct hiddev_usage_ref
);
410 list
->tail
= (list
->tail
+ 1) & (HIDDEV_BUFFER_SIZE
- 1);
414 mutex_unlock(&list
->thread_lock
);
421 * No kernel lock - fine
423 static unsigned int hiddev_poll(struct file
*file
, poll_table
*wait
)
425 struct hiddev_list
*list
= file
->private_data
;
427 poll_wait(file
, &list
->hiddev
->wait
, wait
);
428 if (list
->head
!= list
->tail
)
429 return POLLIN
| POLLRDNORM
;
430 if (!list
->hiddev
->exist
)
431 return POLLERR
| POLLHUP
;
438 static noinline
int hiddev_ioctl_usage(struct hiddev
*hiddev
, unsigned int cmd
, void __user
*user_arg
)
440 struct hid_device
*hid
= hiddev
->hid
;
441 struct hiddev_report_info rinfo
;
442 struct hiddev_usage_ref_multi
*uref_multi
= NULL
;
443 struct hiddev_usage_ref
*uref
;
444 struct hid_report
*report
;
445 struct hid_field
*field
;
448 uref_multi
= kmalloc(sizeof(struct hiddev_usage_ref_multi
), GFP_KERNEL
);
451 uref
= &uref_multi
->uref
;
452 if (cmd
== HIDIOCGUSAGES
|| cmd
== HIDIOCSUSAGES
) {
453 if (copy_from_user(uref_multi
, user_arg
,
454 sizeof(*uref_multi
)))
457 if (copy_from_user(uref
, user_arg
, sizeof(*uref
)))
463 rinfo
.report_type
= uref
->report_type
;
464 rinfo
.report_id
= uref
->report_id
;
465 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
468 if (uref
->field_index
>= report
->maxfield
)
471 field
= report
->field
[uref
->field_index
];
472 if (uref
->usage_index
>= field
->maxusage
)
475 uref
->usage_code
= field
->usage
[uref
->usage_index
].hid
;
477 if (copy_to_user(user_arg
, uref
, sizeof(*uref
)))
483 if (cmd
!= HIDIOCGUSAGE
&&
484 cmd
!= HIDIOCGUSAGES
&&
485 uref
->report_type
== HID_REPORT_TYPE_INPUT
)
488 if (uref
->report_id
== HID_REPORT_ID_UNKNOWN
) {
489 field
= hiddev_lookup_usage(hid
, uref
);
493 rinfo
.report_type
= uref
->report_type
;
494 rinfo
.report_id
= uref
->report_id
;
495 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
498 if (uref
->field_index
>= report
->maxfield
)
501 field
= report
->field
[uref
->field_index
];
503 if (cmd
== HIDIOCGCOLLECTIONINDEX
) {
504 if (uref
->usage_index
>= field
->maxusage
)
506 } else if (uref
->usage_index
>= field
->report_count
)
509 else if ((cmd
== HIDIOCGUSAGES
|| cmd
== HIDIOCSUSAGES
) &&
510 (uref_multi
->num_values
> HID_MAX_MULTI_USAGES
||
511 uref
->usage_index
+ uref_multi
->num_values
> field
->report_count
))
517 uref
->value
= field
->value
[uref
->usage_index
];
518 if (copy_to_user(user_arg
, uref
, sizeof(*uref
)))
523 field
->value
[uref
->usage_index
] = uref
->value
;
526 case HIDIOCGCOLLECTIONINDEX
:
527 i
= field
->usage
[uref
->usage_index
].collection_index
;
531 for (i
= 0; i
< uref_multi
->num_values
; i
++)
532 uref_multi
->values
[i
] =
533 field
->value
[uref
->usage_index
+ i
];
534 if (copy_to_user(user_arg
, uref_multi
,
535 sizeof(*uref_multi
)))
539 for (i
= 0; i
< uref_multi
->num_values
; i
++)
540 field
->value
[uref
->usage_index
+ i
] =
541 uref_multi
->values
[i
];
557 static noinline
int hiddev_ioctl_string(struct hiddev
*hiddev
, unsigned int cmd
, void __user
*user_arg
)
559 struct hid_device
*hid
= hiddev
->hid
;
560 struct usb_device
*dev
= hid_to_usb_dev(hid
);
564 if (get_user(idx
, (int __user
*)user_arg
))
567 if ((buf
= kmalloc(HID_STRING_SIZE
, GFP_KERNEL
)) == NULL
)
570 if ((len
= usb_string(dev
, idx
, buf
, HID_STRING_SIZE
-1)) < 0) {
575 if (copy_to_user(user_arg
+sizeof(int), buf
, len
+1)) {
585 static long hiddev_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
587 struct hiddev_list
*list
= file
->private_data
;
588 struct hiddev
*hiddev
= list
->hiddev
;
589 struct hid_device
*hid
;
590 struct hiddev_collection_info cinfo
;
591 struct hiddev_report_info rinfo
;
592 struct hiddev_field_info finfo
;
593 struct hiddev_devinfo dinfo
;
594 struct hid_report
*report
;
595 struct hid_field
*field
;
596 void __user
*user_arg
= (void __user
*)arg
;
599 /* Called without BKL by compat methods so no BKL taken */
601 mutex_lock(&hiddev
->existancelock
);
602 if (!hiddev
->exist
) {
612 r
= put_user(HID_VERSION
, (int __user
*)arg
) ?
616 case HIDIOCAPPLICATION
:
617 if (arg
< 0 || arg
>= hid
->maxapplication
)
620 for (i
= 0; i
< hid
->maxcollection
; i
++)
621 if (hid
->collection
[i
].type
==
622 HID_COLLECTION_APPLICATION
&& arg
-- == 0)
625 if (i
< hid
->maxcollection
)
626 r
= hid
->collection
[i
].usage
;
631 struct usb_device
*dev
= hid_to_usb_dev(hid
);
632 struct usbhid_device
*usbhid
= hid
->driver_data
;
634 dinfo
.bustype
= BUS_USB
;
635 dinfo
.busnum
= dev
->bus
->busnum
;
636 dinfo
.devnum
= dev
->devnum
;
637 dinfo
.ifnum
= usbhid
->ifnum
;
638 dinfo
.vendor
= le16_to_cpu(dev
->descriptor
.idVendor
);
639 dinfo
.product
= le16_to_cpu(dev
->descriptor
.idProduct
);
640 dinfo
.version
= le16_to_cpu(dev
->descriptor
.bcdDevice
);
641 dinfo
.num_applications
= hid
->maxapplication
;
643 r
= copy_to_user(user_arg
, &dinfo
, sizeof(dinfo
)) ?
649 r
= put_user(list
->flags
, (int __user
*)arg
) ?
657 if (get_user(newflags
, (int __user
*)arg
)) {
662 if ((newflags
& ~HIDDEV_FLAGS
) != 0 ||
663 ((newflags
& HIDDEV_FLAG_REPORT
) != 0 &&
664 (newflags
& HIDDEV_FLAG_UREF
) == 0))
667 list
->flags
= newflags
;
674 r
= hiddev_ioctl_string(hiddev
, cmd
, user_arg
);
677 case HIDIOCINITREPORT
:
678 usbhid_init_reports(hid
);
683 if (copy_from_user(&rinfo
, user_arg
, sizeof(rinfo
))) {
688 if (rinfo
.report_type
== HID_REPORT_TYPE_OUTPUT
)
691 report
= hiddev_lookup_report(hid
, &rinfo
);
695 usbhid_submit_report(hid
, report
, USB_DIR_IN
);
702 if (copy_from_user(&rinfo
, user_arg
, sizeof(rinfo
))) {
707 if (rinfo
.report_type
== HID_REPORT_TYPE_INPUT
)
710 report
= hiddev_lookup_report(hid
, &rinfo
);
714 usbhid_submit_report(hid
, report
, USB_DIR_OUT
);
720 case HIDIOCGREPORTINFO
:
721 if (copy_from_user(&rinfo
, user_arg
, sizeof(rinfo
))) {
726 report
= hiddev_lookup_report(hid
, &rinfo
);
730 rinfo
.num_fields
= report
->maxfield
;
732 r
= copy_to_user(user_arg
, &rinfo
, sizeof(rinfo
)) ?
736 case HIDIOCGFIELDINFO
:
737 if (copy_from_user(&finfo
, user_arg
, sizeof(finfo
))) {
742 rinfo
.report_type
= finfo
.report_type
;
743 rinfo
.report_id
= finfo
.report_id
;
745 report
= hiddev_lookup_report(hid
, &rinfo
);
749 if (finfo
.field_index
>= report
->maxfield
)
752 field
= report
->field
[finfo
.field_index
];
753 memset(&finfo
, 0, sizeof(finfo
));
754 finfo
.report_type
= rinfo
.report_type
;
755 finfo
.report_id
= rinfo
.report_id
;
756 finfo
.field_index
= field
->report_count
- 1;
757 finfo
.maxusage
= field
->maxusage
;
758 finfo
.flags
= field
->flags
;
759 finfo
.physical
= field
->physical
;
760 finfo
.logical
= field
->logical
;
761 finfo
.application
= field
->application
;
762 finfo
.logical_minimum
= field
->logical_minimum
;
763 finfo
.logical_maximum
= field
->logical_maximum
;
764 finfo
.physical_minimum
= field
->physical_minimum
;
765 finfo
.physical_maximum
= field
->physical_maximum
;
766 finfo
.unit_exponent
= field
->unit_exponent
;
767 finfo
.unit
= field
->unit
;
769 r
= copy_to_user(user_arg
, &finfo
, sizeof(finfo
)) ?
779 case HIDIOCGCOLLECTIONINDEX
:
780 r
= hiddev_ioctl_usage(hiddev
, cmd
, user_arg
);
783 case HIDIOCGCOLLECTIONINFO
:
784 if (copy_from_user(&cinfo
, user_arg
, sizeof(cinfo
))) {
789 if (cinfo
.index
>= hid
->maxcollection
)
792 cinfo
.type
= hid
->collection
[cinfo
.index
].type
;
793 cinfo
.usage
= hid
->collection
[cinfo
.index
].usage
;
794 cinfo
.level
= hid
->collection
[cinfo
.index
].level
;
796 r
= copy_to_user(user_arg
, &cinfo
, sizeof(cinfo
)) ?
801 if (_IOC_TYPE(cmd
) != 'H' || _IOC_DIR(cmd
) != _IOC_READ
)
804 if (_IOC_NR(cmd
) == _IOC_NR(HIDIOCGNAME(0))) {
812 len
= strlen(hid
->name
) + 1;
813 if (len
> _IOC_SIZE(cmd
))
814 len
= _IOC_SIZE(cmd
);
815 r
= copy_to_user(user_arg
, hid
->name
, len
) ?
820 if (_IOC_NR(cmd
) == _IOC_NR(HIDIOCGPHYS(0))) {
828 len
= strlen(hid
->phys
) + 1;
829 if (len
> _IOC_SIZE(cmd
))
830 len
= _IOC_SIZE(cmd
);
831 r
= copy_to_user(user_arg
, hid
->phys
, len
) ?
838 mutex_unlock(&hiddev
->existancelock
);
843 static long hiddev_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
845 return hiddev_ioctl(file
, cmd
, (unsigned long)compat_ptr(arg
));
849 static const struct file_operations hiddev_fops
= {
850 .owner
= THIS_MODULE
,
852 .write
= hiddev_write
,
855 .release
= hiddev_release
,
856 .unlocked_ioctl
= hiddev_ioctl
,
857 .fasync
= hiddev_fasync
,
859 .compat_ioctl
= hiddev_compat_ioctl
,
861 .llseek
= noop_llseek
,
864 static char *hiddev_devnode(struct device
*dev
, mode_t
*mode
)
866 return kasprintf(GFP_KERNEL
, "usb/%s", dev_name(dev
));
869 static struct usb_class_driver hiddev_class
= {
871 .devnode
= hiddev_devnode
,
872 .fops
= &hiddev_fops
,
873 .minor_base
= HIDDEV_MINOR_BASE
,
877 * This is where hid.c calls us to connect a hid device to the hiddev driver
879 int hiddev_connect(struct hid_device
*hid
, unsigned int force
)
881 struct hiddev
*hiddev
;
882 struct usbhid_device
*usbhid
= hid
->driver_data
;
887 for (i
= 0; i
< hid
->maxcollection
; i
++)
888 if (hid
->collection
[i
].type
==
889 HID_COLLECTION_APPLICATION
&&
890 !IS_INPUT_APPLICATION(hid
->collection
[i
].usage
))
893 if (i
== hid
->maxcollection
)
897 if (!(hiddev
= kzalloc(sizeof(struct hiddev
), GFP_KERNEL
)))
900 init_waitqueue_head(&hiddev
->wait
);
901 INIT_LIST_HEAD(&hiddev
->list
);
902 spin_lock_init(&hiddev
->list_lock
);
903 mutex_init(&hiddev
->existancelock
);
904 hid
->hiddev
= hiddev
;
907 retval
= usb_register_dev(usbhid
->intf
, &hiddev_class
);
909 hid_err(hid
, "Not able to get a minor for this device\n");
918 * This is where hid.c calls us to disconnect a hiddev device from the
919 * corresponding hid device (usually because the usb device has disconnected)
921 static struct usb_class_driver hiddev_class
;
922 void hiddev_disconnect(struct hid_device
*hid
)
924 struct hiddev
*hiddev
= hid
->hiddev
;
925 struct usbhid_device
*usbhid
= hid
->driver_data
;
927 mutex_lock(&hiddev
->existancelock
);
929 mutex_unlock(&hiddev
->existancelock
);
931 usb_deregister_dev(usbhid
->intf
, &hiddev_class
);
934 usbhid_close(hiddev
->hid
);
935 wake_up_interruptible(&hiddev
->wait
);