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/sched/signal.h>
31 #include <linux/module.h>
32 #include <linux/init.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>
38 #include <linux/vmalloc.h>
41 #ifdef CONFIG_USB_DYNAMIC_MINORS
42 #define HIDDEV_MINOR_BASE 0
43 #define HIDDEV_MINORS 256
45 #define HIDDEV_MINOR_BASE 96
46 #define HIDDEV_MINORS 16
48 #define HIDDEV_BUFFER_SIZE 2048
53 struct mutex existancelock
;
54 wait_queue_head_t wait
;
55 struct hid_device
*hid
;
56 struct list_head list
;
61 struct hiddev_usage_ref buffer
[HIDDEV_BUFFER_SIZE
];
65 struct fasync_struct
*fasync
;
66 struct hiddev
*hiddev
;
67 struct list_head node
;
68 struct mutex thread_lock
;
72 * Find a report, given the report's type and ID. The ID can be specified
73 * indirectly by REPORT_ID_FIRST (which returns the first report of the given
74 * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the
75 * given type which follows old_id.
77 static struct hid_report
*
78 hiddev_lookup_report(struct hid_device
*hid
, struct hiddev_report_info
*rinfo
)
80 unsigned int flags
= rinfo
->report_id
& ~HID_REPORT_ID_MASK
;
81 unsigned int rid
= rinfo
->report_id
& HID_REPORT_ID_MASK
;
82 struct hid_report_enum
*report_enum
;
83 struct hid_report
*report
;
84 struct list_head
*list
;
86 if (rinfo
->report_type
< HID_REPORT_TYPE_MIN
||
87 rinfo
->report_type
> HID_REPORT_TYPE_MAX
)
90 report_enum
= hid
->report_enum
+
91 (rinfo
->report_type
- HID_REPORT_TYPE_MIN
);
94 case 0: /* Nothing to do -- report_id is already set correctly */
97 case HID_REPORT_ID_FIRST
:
98 if (list_empty(&report_enum
->report_list
))
101 list
= report_enum
->report_list
.next
;
102 report
= list_entry(list
, struct hid_report
, list
);
103 rinfo
->report_id
= report
->id
;
106 case HID_REPORT_ID_NEXT
:
107 report
= report_enum
->report_id_hash
[rid
];
111 list
= report
->list
.next
;
112 if (list
== &report_enum
->report_list
)
115 report
= list_entry(list
, struct hid_report
, list
);
116 rinfo
->report_id
= report
->id
;
123 return report_enum
->report_id_hash
[rinfo
->report_id
];
127 * Perform an exhaustive search of the report table for a usage, given its
130 static struct hid_field
*
131 hiddev_lookup_usage(struct hid_device
*hid
, struct hiddev_usage_ref
*uref
)
134 struct hid_report
*report
;
135 struct hid_report_enum
*report_enum
;
136 struct hid_field
*field
;
138 if (uref
->report_type
< HID_REPORT_TYPE_MIN
||
139 uref
->report_type
> HID_REPORT_TYPE_MAX
)
142 report_enum
= hid
->report_enum
+
143 (uref
->report_type
- HID_REPORT_TYPE_MIN
);
145 list_for_each_entry(report
, &report_enum
->report_list
, list
) {
146 for (i
= 0; i
< report
->maxfield
; i
++) {
147 field
= report
->field
[i
];
148 for (j
= 0; j
< field
->maxusage
; j
++) {
149 if (field
->usage
[j
].hid
== uref
->usage_code
) {
150 uref
->report_id
= report
->id
;
151 uref
->field_index
= i
;
152 uref
->usage_index
= j
;
162 static void hiddev_send_event(struct hid_device
*hid
,
163 struct hiddev_usage_ref
*uref
)
165 struct hiddev
*hiddev
= hid
->hiddev
;
166 struct hiddev_list
*list
;
169 spin_lock_irqsave(&hiddev
->list_lock
, flags
);
170 list_for_each_entry(list
, &hiddev
->list
, node
) {
171 if (uref
->field_index
!= HID_FIELD_INDEX_NONE
||
172 (list
->flags
& HIDDEV_FLAG_REPORT
) != 0) {
173 list
->buffer
[list
->head
] = *uref
;
174 list
->head
= (list
->head
+ 1) &
175 (HIDDEV_BUFFER_SIZE
- 1);
176 kill_fasync(&list
->fasync
, SIGIO
, POLL_IN
);
179 spin_unlock_irqrestore(&hiddev
->list_lock
, flags
);
181 wake_up_interruptible(&hiddev
->wait
);
185 * This is where hid.c calls into hiddev to pass an event that occurred over
188 void hiddev_hid_event(struct hid_device
*hid
, struct hid_field
*field
,
189 struct hid_usage
*usage
, __s32 value
)
191 unsigned type
= field
->report_type
;
192 struct hiddev_usage_ref uref
;
195 (type
== HID_INPUT_REPORT
) ? HID_REPORT_TYPE_INPUT
:
196 ((type
== HID_OUTPUT_REPORT
) ? HID_REPORT_TYPE_OUTPUT
:
197 ((type
== HID_FEATURE_REPORT
) ? HID_REPORT_TYPE_FEATURE
: 0));
198 uref
.report_id
= field
->report
->id
;
199 uref
.field_index
= field
->index
;
200 uref
.usage_index
= (usage
- field
->usage
);
201 uref
.usage_code
= usage
->hid
;
204 hiddev_send_event(hid
, &uref
);
206 EXPORT_SYMBOL_GPL(hiddev_hid_event
);
208 void hiddev_report_event(struct hid_device
*hid
, struct hid_report
*report
)
210 unsigned type
= report
->type
;
211 struct hiddev_usage_ref uref
;
213 memset(&uref
, 0, sizeof(uref
));
215 (type
== HID_INPUT_REPORT
) ? HID_REPORT_TYPE_INPUT
:
216 ((type
== HID_OUTPUT_REPORT
) ? HID_REPORT_TYPE_OUTPUT
:
217 ((type
== HID_FEATURE_REPORT
) ? HID_REPORT_TYPE_FEATURE
: 0));
218 uref
.report_id
= report
->id
;
219 uref
.field_index
= HID_FIELD_INDEX_NONE
;
221 hiddev_send_event(hid
, &uref
);
227 static int hiddev_fasync(int fd
, struct file
*file
, int on
)
229 struct hiddev_list
*list
= file
->private_data
;
231 return fasync_helper(fd
, file
, on
, &list
->fasync
);
238 static int hiddev_release(struct inode
* inode
, struct file
* file
)
240 struct hiddev_list
*list
= file
->private_data
;
243 spin_lock_irqsave(&list
->hiddev
->list_lock
, flags
);
244 list_del(&list
->node
);
245 spin_unlock_irqrestore(&list
->hiddev
->list_lock
, flags
);
247 mutex_lock(&list
->hiddev
->existancelock
);
248 if (!--list
->hiddev
->open
) {
249 if (list
->hiddev
->exist
) {
250 usbhid_close(list
->hiddev
->hid
);
251 usbhid_put_power(list
->hiddev
->hid
);
253 mutex_unlock(&list
->hiddev
->existancelock
);
260 mutex_unlock(&list
->hiddev
->existancelock
);
269 static int hiddev_open(struct inode
*inode
, struct file
*file
)
271 struct hiddev_list
*list
;
272 struct usb_interface
*intf
;
273 struct hid_device
*hid
;
274 struct hiddev
*hiddev
;
277 intf
= usbhid_find_interface(iminor(inode
));
280 hid
= usb_get_intfdata(intf
);
281 hiddev
= hid
->hiddev
;
283 if (!(list
= vzalloc(sizeof(struct hiddev_list
))))
285 mutex_init(&list
->thread_lock
);
286 list
->hiddev
= hiddev
;
287 file
->private_data
= list
;
290 * no need for locking because the USB major number
291 * is shared which usbcore guards against disconnect
293 if (list
->hiddev
->exist
) {
294 if (!list
->hiddev
->open
++) {
295 res
= usbhid_open(hiddev
->hid
);
306 spin_lock_irq(&list
->hiddev
->list_lock
);
307 list_add_tail(&list
->node
, &hiddev
->list
);
308 spin_unlock_irq(&list
->hiddev
->list_lock
);
310 mutex_lock(&hiddev
->existancelock
);
311 if (!list
->hiddev
->open
++)
312 if (list
->hiddev
->exist
) {
313 struct hid_device
*hid
= hiddev
->hid
;
314 res
= usbhid_get_power(hid
);
321 mutex_unlock(&hiddev
->existancelock
);
324 mutex_unlock(&hiddev
->existancelock
);
326 file
->private_data
= NULL
;
334 static ssize_t
hiddev_write(struct file
* file
, const char __user
* buffer
, size_t count
, loff_t
*ppos
)
342 static ssize_t
hiddev_read(struct file
* file
, char __user
* buffer
, size_t count
, loff_t
*ppos
)
345 struct hiddev_list
*list
= file
->private_data
;
349 event_size
= ((list
->flags
& HIDDEV_FLAG_UREF
) != 0) ?
350 sizeof(struct hiddev_usage_ref
) : sizeof(struct hiddev_event
);
352 if (count
< event_size
)
355 /* lock against other threads */
356 retval
= mutex_lock_interruptible(&list
->thread_lock
);
360 while (retval
== 0) {
361 if (list
->head
== list
->tail
) {
362 prepare_to_wait(&list
->hiddev
->wait
, &wait
, TASK_INTERRUPTIBLE
);
364 while (list
->head
== list
->tail
) {
365 if (signal_pending(current
)) {
366 retval
= -ERESTARTSYS
;
369 if (!list
->hiddev
->exist
) {
373 if (file
->f_flags
& O_NONBLOCK
) {
378 /* let O_NONBLOCK tasks run */
379 mutex_unlock(&list
->thread_lock
);
381 if (mutex_lock_interruptible(&list
->thread_lock
)) {
382 finish_wait(&list
->hiddev
->wait
, &wait
);
385 set_current_state(TASK_INTERRUPTIBLE
);
387 finish_wait(&list
->hiddev
->wait
, &wait
);
392 mutex_unlock(&list
->thread_lock
);
397 while (list
->head
!= list
->tail
&&
398 retval
+ event_size
<= count
) {
399 if ((list
->flags
& HIDDEV_FLAG_UREF
) == 0) {
400 if (list
->buffer
[list
->tail
].field_index
!= HID_FIELD_INDEX_NONE
) {
401 struct hiddev_event event
;
403 event
.hid
= list
->buffer
[list
->tail
].usage_code
;
404 event
.value
= list
->buffer
[list
->tail
].value
;
405 if (copy_to_user(buffer
+ retval
, &event
, sizeof(struct hiddev_event
))) {
406 mutex_unlock(&list
->thread_lock
);
409 retval
+= sizeof(struct hiddev_event
);
412 if (list
->buffer
[list
->tail
].field_index
!= HID_FIELD_INDEX_NONE
||
413 (list
->flags
& HIDDEV_FLAG_REPORT
) != 0) {
415 if (copy_to_user(buffer
+ retval
, list
->buffer
+ list
->tail
, sizeof(struct hiddev_usage_ref
))) {
416 mutex_unlock(&list
->thread_lock
);
419 retval
+= sizeof(struct hiddev_usage_ref
);
422 list
->tail
= (list
->tail
+ 1) & (HIDDEV_BUFFER_SIZE
- 1);
426 mutex_unlock(&list
->thread_lock
);
433 * No kernel lock - fine
435 static unsigned int hiddev_poll(struct file
*file
, poll_table
*wait
)
437 struct hiddev_list
*list
= file
->private_data
;
439 poll_wait(file
, &list
->hiddev
->wait
, wait
);
440 if (list
->head
!= list
->tail
)
441 return POLLIN
| POLLRDNORM
;
442 if (!list
->hiddev
->exist
)
443 return POLLERR
| POLLHUP
;
450 static noinline
int hiddev_ioctl_usage(struct hiddev
*hiddev
, unsigned int cmd
, void __user
*user_arg
)
452 struct hid_device
*hid
= hiddev
->hid
;
453 struct hiddev_report_info rinfo
;
454 struct hiddev_usage_ref_multi
*uref_multi
= NULL
;
455 struct hiddev_usage_ref
*uref
;
456 struct hid_report
*report
;
457 struct hid_field
*field
;
460 uref_multi
= kmalloc(sizeof(struct hiddev_usage_ref_multi
), GFP_KERNEL
);
463 uref
= &uref_multi
->uref
;
464 if (cmd
== HIDIOCGUSAGES
|| cmd
== HIDIOCSUSAGES
) {
465 if (copy_from_user(uref_multi
, user_arg
,
466 sizeof(*uref_multi
)))
469 if (copy_from_user(uref
, user_arg
, sizeof(*uref
)))
475 rinfo
.report_type
= uref
->report_type
;
476 rinfo
.report_id
= uref
->report_id
;
477 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
480 if (uref
->field_index
>= report
->maxfield
)
483 field
= report
->field
[uref
->field_index
];
484 if (uref
->usage_index
>= field
->maxusage
)
487 uref
->usage_code
= field
->usage
[uref
->usage_index
].hid
;
489 if (copy_to_user(user_arg
, uref
, sizeof(*uref
)))
495 if (cmd
!= HIDIOCGUSAGE
&&
496 cmd
!= HIDIOCGUSAGES
&&
497 uref
->report_type
== HID_REPORT_TYPE_INPUT
)
500 if (uref
->report_id
== HID_REPORT_ID_UNKNOWN
) {
501 field
= hiddev_lookup_usage(hid
, uref
);
505 rinfo
.report_type
= uref
->report_type
;
506 rinfo
.report_id
= uref
->report_id
;
507 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
510 if (uref
->field_index
>= report
->maxfield
)
513 field
= report
->field
[uref
->field_index
];
515 if (cmd
== HIDIOCGCOLLECTIONINDEX
) {
516 if (uref
->usage_index
>= field
->maxusage
)
518 } else if (uref
->usage_index
>= field
->report_count
)
522 if ((cmd
== HIDIOCGUSAGES
|| cmd
== HIDIOCSUSAGES
) &&
523 (uref_multi
->num_values
> HID_MAX_MULTI_USAGES
||
524 uref
->usage_index
+ uref_multi
->num_values
> field
->report_count
))
529 uref
->value
= field
->value
[uref
->usage_index
];
530 if (copy_to_user(user_arg
, uref
, sizeof(*uref
)))
535 field
->value
[uref
->usage_index
] = uref
->value
;
538 case HIDIOCGCOLLECTIONINDEX
:
539 i
= field
->usage
[uref
->usage_index
].collection_index
;
543 for (i
= 0; i
< uref_multi
->num_values
; i
++)
544 uref_multi
->values
[i
] =
545 field
->value
[uref
->usage_index
+ i
];
546 if (copy_to_user(user_arg
, uref_multi
,
547 sizeof(*uref_multi
)))
551 for (i
= 0; i
< uref_multi
->num_values
; i
++)
552 field
->value
[uref
->usage_index
+ i
] =
553 uref_multi
->values
[i
];
569 static noinline
int hiddev_ioctl_string(struct hiddev
*hiddev
, unsigned int cmd
, void __user
*user_arg
)
571 struct hid_device
*hid
= hiddev
->hid
;
572 struct usb_device
*dev
= hid_to_usb_dev(hid
);
576 if (get_user(idx
, (int __user
*)user_arg
))
579 if ((buf
= kmalloc(HID_STRING_SIZE
, GFP_KERNEL
)) == NULL
)
582 if ((len
= usb_string(dev
, idx
, buf
, HID_STRING_SIZE
-1)) < 0) {
587 if (copy_to_user(user_arg
+sizeof(int), buf
, len
+1)) {
597 static long hiddev_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
599 struct hiddev_list
*list
= file
->private_data
;
600 struct hiddev
*hiddev
= list
->hiddev
;
601 struct hid_device
*hid
;
602 struct hiddev_collection_info cinfo
;
603 struct hiddev_report_info rinfo
;
604 struct hiddev_field_info finfo
;
605 struct hiddev_devinfo dinfo
;
606 struct hid_report
*report
;
607 struct hid_field
*field
;
608 void __user
*user_arg
= (void __user
*)arg
;
611 /* Called without BKL by compat methods so no BKL taken */
613 mutex_lock(&hiddev
->existancelock
);
614 if (!hiddev
->exist
) {
624 r
= put_user(HID_VERSION
, (int __user
*)arg
) ?
628 case HIDIOCAPPLICATION
:
629 if (arg
>= hid
->maxapplication
)
632 for (i
= 0; i
< hid
->maxcollection
; i
++)
633 if (hid
->collection
[i
].type
==
634 HID_COLLECTION_APPLICATION
&& arg
-- == 0)
637 if (i
< hid
->maxcollection
)
638 r
= hid
->collection
[i
].usage
;
643 struct usb_device
*dev
= hid_to_usb_dev(hid
);
644 struct usbhid_device
*usbhid
= hid
->driver_data
;
646 memset(&dinfo
, 0, sizeof(dinfo
));
648 dinfo
.bustype
= BUS_USB
;
649 dinfo
.busnum
= dev
->bus
->busnum
;
650 dinfo
.devnum
= dev
->devnum
;
651 dinfo
.ifnum
= usbhid
->ifnum
;
652 dinfo
.vendor
= le16_to_cpu(dev
->descriptor
.idVendor
);
653 dinfo
.product
= le16_to_cpu(dev
->descriptor
.idProduct
);
654 dinfo
.version
= le16_to_cpu(dev
->descriptor
.bcdDevice
);
655 dinfo
.num_applications
= hid
->maxapplication
;
657 r
= copy_to_user(user_arg
, &dinfo
, sizeof(dinfo
)) ?
663 r
= put_user(list
->flags
, (int __user
*)arg
) ?
671 if (get_user(newflags
, (int __user
*)arg
)) {
676 if ((newflags
& ~HIDDEV_FLAGS
) != 0 ||
677 ((newflags
& HIDDEV_FLAG_REPORT
) != 0 &&
678 (newflags
& HIDDEV_FLAG_UREF
) == 0))
681 list
->flags
= newflags
;
688 r
= hiddev_ioctl_string(hiddev
, cmd
, user_arg
);
691 case HIDIOCINITREPORT
:
692 usbhid_init_reports(hid
);
697 if (copy_from_user(&rinfo
, user_arg
, sizeof(rinfo
))) {
702 if (rinfo
.report_type
== HID_REPORT_TYPE_OUTPUT
)
705 report
= hiddev_lookup_report(hid
, &rinfo
);
709 hid_hw_request(hid
, report
, HID_REQ_GET_REPORT
);
716 if (copy_from_user(&rinfo
, user_arg
, sizeof(rinfo
))) {
721 if (rinfo
.report_type
== HID_REPORT_TYPE_INPUT
)
724 report
= hiddev_lookup_report(hid
, &rinfo
);
728 hid_hw_request(hid
, report
, HID_REQ_SET_REPORT
);
734 case HIDIOCGREPORTINFO
:
735 if (copy_from_user(&rinfo
, user_arg
, sizeof(rinfo
))) {
740 report
= hiddev_lookup_report(hid
, &rinfo
);
744 rinfo
.num_fields
= report
->maxfield
;
746 r
= copy_to_user(user_arg
, &rinfo
, sizeof(rinfo
)) ?
750 case HIDIOCGFIELDINFO
:
751 if (copy_from_user(&finfo
, user_arg
, sizeof(finfo
))) {
756 rinfo
.report_type
= finfo
.report_type
;
757 rinfo
.report_id
= finfo
.report_id
;
759 report
= hiddev_lookup_report(hid
, &rinfo
);
763 if (finfo
.field_index
>= report
->maxfield
)
766 field
= report
->field
[finfo
.field_index
];
767 memset(&finfo
, 0, sizeof(finfo
));
768 finfo
.report_type
= rinfo
.report_type
;
769 finfo
.report_id
= rinfo
.report_id
;
770 finfo
.field_index
= field
->report_count
- 1;
771 finfo
.maxusage
= field
->maxusage
;
772 finfo
.flags
= field
->flags
;
773 finfo
.physical
= field
->physical
;
774 finfo
.logical
= field
->logical
;
775 finfo
.application
= field
->application
;
776 finfo
.logical_minimum
= field
->logical_minimum
;
777 finfo
.logical_maximum
= field
->logical_maximum
;
778 finfo
.physical_minimum
= field
->physical_minimum
;
779 finfo
.physical_maximum
= field
->physical_maximum
;
780 finfo
.unit_exponent
= field
->unit_exponent
;
781 finfo
.unit
= field
->unit
;
783 r
= copy_to_user(user_arg
, &finfo
, sizeof(finfo
)) ?
793 case HIDIOCGCOLLECTIONINDEX
:
794 r
= hiddev_ioctl_usage(hiddev
, cmd
, user_arg
);
797 case HIDIOCGCOLLECTIONINFO
:
798 if (copy_from_user(&cinfo
, user_arg
, sizeof(cinfo
))) {
803 if (cinfo
.index
>= hid
->maxcollection
)
806 cinfo
.type
= hid
->collection
[cinfo
.index
].type
;
807 cinfo
.usage
= hid
->collection
[cinfo
.index
].usage
;
808 cinfo
.level
= hid
->collection
[cinfo
.index
].level
;
810 r
= copy_to_user(user_arg
, &cinfo
, sizeof(cinfo
)) ?
815 if (_IOC_TYPE(cmd
) != 'H' || _IOC_DIR(cmd
) != _IOC_READ
)
818 if (_IOC_NR(cmd
) == _IOC_NR(HIDIOCGNAME(0))) {
819 int len
= strlen(hid
->name
) + 1;
820 if (len
> _IOC_SIZE(cmd
))
821 len
= _IOC_SIZE(cmd
);
822 r
= copy_to_user(user_arg
, hid
->name
, len
) ?
827 if (_IOC_NR(cmd
) == _IOC_NR(HIDIOCGPHYS(0))) {
828 int 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
, umode_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 usb_deregister_dev(usbhid
->intf
, &hiddev_class
);
929 mutex_lock(&hiddev
->existancelock
);
933 mutex_unlock(&hiddev
->existancelock
);
934 usbhid_close(hiddev
->hid
);
935 wake_up_interruptible(&hiddev
->wait
);
937 mutex_unlock(&hiddev
->existancelock
);