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/input.h>
33 #include <linux/usb.h>
34 #include <linux/hid.h>
35 #include <linux/hiddev.h>
36 #include <linux/compat.h>
39 #ifdef CONFIG_USB_DYNAMIC_MINORS
40 #define HIDDEV_MINOR_BASE 0
41 #define HIDDEV_MINORS 256
43 #define HIDDEV_MINOR_BASE 96
44 #define HIDDEV_MINORS 16
46 #define HIDDEV_BUFFER_SIZE 2048
51 struct mutex existancelock
;
52 wait_queue_head_t wait
;
53 struct hid_device
*hid
;
54 struct list_head list
;
59 struct hiddev_usage_ref buffer
[HIDDEV_BUFFER_SIZE
];
63 struct fasync_struct
*fasync
;
64 struct hiddev
*hiddev
;
65 struct list_head node
;
66 struct mutex thread_lock
;
70 * Find a report, given the report's type and ID. The ID can be specified
71 * indirectly by REPORT_ID_FIRST (which returns the first report of the given
72 * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the
73 * given type which follows old_id.
75 static struct hid_report
*
76 hiddev_lookup_report(struct hid_device
*hid
, struct hiddev_report_info
*rinfo
)
78 unsigned int flags
= rinfo
->report_id
& ~HID_REPORT_ID_MASK
;
79 unsigned int rid
= rinfo
->report_id
& HID_REPORT_ID_MASK
;
80 struct hid_report_enum
*report_enum
;
81 struct hid_report
*report
;
82 struct list_head
*list
;
84 if (rinfo
->report_type
< HID_REPORT_TYPE_MIN
||
85 rinfo
->report_type
> HID_REPORT_TYPE_MAX
)
88 report_enum
= hid
->report_enum
+
89 (rinfo
->report_type
- HID_REPORT_TYPE_MIN
);
92 case 0: /* Nothing to do -- report_id is already set correctly */
95 case HID_REPORT_ID_FIRST
:
96 if (list_empty(&report_enum
->report_list
))
99 list
= report_enum
->report_list
.next
;
100 report
= list_entry(list
, struct hid_report
, list
);
101 rinfo
->report_id
= report
->id
;
104 case HID_REPORT_ID_NEXT
:
105 report
= report_enum
->report_id_hash
[rid
];
109 list
= report
->list
.next
;
110 if (list
== &report_enum
->report_list
)
113 report
= list_entry(list
, struct hid_report
, list
);
114 rinfo
->report_id
= report
->id
;
121 return report_enum
->report_id_hash
[rinfo
->report_id
];
125 * Perform an exhaustive search of the report table for a usage, given its
128 static struct hid_field
*
129 hiddev_lookup_usage(struct hid_device
*hid
, struct hiddev_usage_ref
*uref
)
132 struct hid_report
*report
;
133 struct hid_report_enum
*report_enum
;
134 struct hid_field
*field
;
136 if (uref
->report_type
< HID_REPORT_TYPE_MIN
||
137 uref
->report_type
> HID_REPORT_TYPE_MAX
)
140 report_enum
= hid
->report_enum
+
141 (uref
->report_type
- HID_REPORT_TYPE_MIN
);
143 list_for_each_entry(report
, &report_enum
->report_list
, list
) {
144 for (i
= 0; i
< report
->maxfield
; i
++) {
145 field
= report
->field
[i
];
146 for (j
= 0; j
< field
->maxusage
; j
++) {
147 if (field
->usage
[j
].hid
== uref
->usage_code
) {
148 uref
->report_id
= report
->id
;
149 uref
->field_index
= i
;
150 uref
->usage_index
= j
;
160 static void hiddev_send_event(struct hid_device
*hid
,
161 struct hiddev_usage_ref
*uref
)
163 struct hiddev
*hiddev
= hid
->hiddev
;
164 struct hiddev_list
*list
;
167 spin_lock_irqsave(&hiddev
->list_lock
, flags
);
168 list_for_each_entry(list
, &hiddev
->list
, node
) {
169 if (uref
->field_index
!= HID_FIELD_INDEX_NONE
||
170 (list
->flags
& HIDDEV_FLAG_REPORT
) != 0) {
171 list
->buffer
[list
->head
] = *uref
;
172 list
->head
= (list
->head
+ 1) &
173 (HIDDEV_BUFFER_SIZE
- 1);
174 kill_fasync(&list
->fasync
, SIGIO
, POLL_IN
);
177 spin_unlock_irqrestore(&hiddev
->list_lock
, flags
);
179 wake_up_interruptible(&hiddev
->wait
);
183 * This is where hid.c calls into hiddev to pass an event that occurred over
186 void hiddev_hid_event(struct hid_device
*hid
, struct hid_field
*field
,
187 struct hid_usage
*usage
, __s32 value
)
189 unsigned type
= field
->report_type
;
190 struct hiddev_usage_ref uref
;
193 (type
== HID_INPUT_REPORT
) ? HID_REPORT_TYPE_INPUT
:
194 ((type
== HID_OUTPUT_REPORT
) ? HID_REPORT_TYPE_OUTPUT
:
195 ((type
== HID_FEATURE_REPORT
) ? HID_REPORT_TYPE_FEATURE
: 0));
196 uref
.report_id
= field
->report
->id
;
197 uref
.field_index
= field
->index
;
198 uref
.usage_index
= (usage
- field
->usage
);
199 uref
.usage_code
= usage
->hid
;
202 hiddev_send_event(hid
, &uref
);
204 EXPORT_SYMBOL_GPL(hiddev_hid_event
);
206 void hiddev_report_event(struct hid_device
*hid
, struct hid_report
*report
)
208 unsigned type
= report
->type
;
209 struct hiddev_usage_ref uref
;
211 memset(&uref
, 0, sizeof(uref
));
213 (type
== HID_INPUT_REPORT
) ? HID_REPORT_TYPE_INPUT
:
214 ((type
== HID_OUTPUT_REPORT
) ? HID_REPORT_TYPE_OUTPUT
:
215 ((type
== HID_FEATURE_REPORT
) ? HID_REPORT_TYPE_FEATURE
: 0));
216 uref
.report_id
= report
->id
;
217 uref
.field_index
= HID_FIELD_INDEX_NONE
;
219 hiddev_send_event(hid
, &uref
);
225 static int hiddev_fasync(int fd
, struct file
*file
, int on
)
227 struct hiddev_list
*list
= file
->private_data
;
229 return fasync_helper(fd
, file
, on
, &list
->fasync
);
236 static int hiddev_release(struct inode
* inode
, struct file
* file
)
238 struct hiddev_list
*list
= file
->private_data
;
241 spin_lock_irqsave(&list
->hiddev
->list_lock
, flags
);
242 list_del(&list
->node
);
243 spin_unlock_irqrestore(&list
->hiddev
->list_lock
, flags
);
245 if (!--list
->hiddev
->open
) {
246 if (list
->hiddev
->exist
) {
247 usbhid_close(list
->hiddev
->hid
);
248 usbhid_put_power(list
->hiddev
->hid
);
262 static int hiddev_open(struct inode
*inode
, struct file
*file
)
264 struct hiddev_list
*list
;
265 struct usb_interface
*intf
;
266 struct hid_device
*hid
;
267 struct hiddev
*hiddev
;
270 intf
= usbhid_find_interface(iminor(inode
));
273 hid
= usb_get_intfdata(intf
);
274 hiddev
= hid
->hiddev
;
276 if (!(list
= kzalloc(sizeof(struct hiddev_list
), GFP_KERNEL
)))
278 mutex_init(&list
->thread_lock
);
279 list
->hiddev
= hiddev
;
280 file
->private_data
= list
;
283 * no need for locking because the USB major number
284 * is shared which usbcore guards against disconnect
286 if (list
->hiddev
->exist
) {
287 if (!list
->hiddev
->open
++) {
288 res
= usbhid_open(hiddev
->hid
);
299 spin_lock_irq(&list
->hiddev
->list_lock
);
300 list_add_tail(&list
->node
, &hiddev
->list
);
301 spin_unlock_irq(&list
->hiddev
->list_lock
);
303 if (!list
->hiddev
->open
++)
304 if (list
->hiddev
->exist
) {
305 struct hid_device
*hid
= hiddev
->hid
;
306 res
= usbhid_get_power(hid
);
315 file
->private_data
= NULL
;
323 static ssize_t
hiddev_write(struct file
* file
, const char __user
* buffer
, size_t count
, loff_t
*ppos
)
331 static ssize_t
hiddev_read(struct file
* file
, char __user
* buffer
, size_t count
, loff_t
*ppos
)
334 struct hiddev_list
*list
= file
->private_data
;
338 event_size
= ((list
->flags
& HIDDEV_FLAG_UREF
) != 0) ?
339 sizeof(struct hiddev_usage_ref
) : sizeof(struct hiddev_event
);
341 if (count
< event_size
)
344 /* lock against other threads */
345 retval
= mutex_lock_interruptible(&list
->thread_lock
);
349 while (retval
== 0) {
350 if (list
->head
== list
->tail
) {
351 prepare_to_wait(&list
->hiddev
->wait
, &wait
, TASK_INTERRUPTIBLE
);
353 while (list
->head
== list
->tail
) {
354 if (file
->f_flags
& O_NONBLOCK
) {
358 if (signal_pending(current
)) {
359 retval
= -ERESTARTSYS
;
362 if (!list
->hiddev
->exist
) {
367 /* let O_NONBLOCK tasks run */
368 mutex_unlock(&list
->thread_lock
);
370 if (mutex_lock_interruptible(&list
->thread_lock
))
372 set_current_state(TASK_INTERRUPTIBLE
);
374 finish_wait(&list
->hiddev
->wait
, &wait
);
379 mutex_unlock(&list
->thread_lock
);
384 while (list
->head
!= list
->tail
&&
385 retval
+ event_size
<= count
) {
386 if ((list
->flags
& HIDDEV_FLAG_UREF
) == 0) {
387 if (list
->buffer
[list
->tail
].field_index
!= HID_FIELD_INDEX_NONE
) {
388 struct hiddev_event event
;
390 event
.hid
= list
->buffer
[list
->tail
].usage_code
;
391 event
.value
= list
->buffer
[list
->tail
].value
;
392 if (copy_to_user(buffer
+ retval
, &event
, sizeof(struct hiddev_event
))) {
393 mutex_unlock(&list
->thread_lock
);
396 retval
+= sizeof(struct hiddev_event
);
399 if (list
->buffer
[list
->tail
].field_index
!= HID_FIELD_INDEX_NONE
||
400 (list
->flags
& HIDDEV_FLAG_REPORT
) != 0) {
402 if (copy_to_user(buffer
+ retval
, list
->buffer
+ list
->tail
, sizeof(struct hiddev_usage_ref
))) {
403 mutex_unlock(&list
->thread_lock
);
406 retval
+= sizeof(struct hiddev_usage_ref
);
409 list
->tail
= (list
->tail
+ 1) & (HIDDEV_BUFFER_SIZE
- 1);
413 mutex_unlock(&list
->thread_lock
);
420 * No kernel lock - fine
422 static unsigned int hiddev_poll(struct file
*file
, poll_table
*wait
)
424 struct hiddev_list
*list
= file
->private_data
;
426 poll_wait(file
, &list
->hiddev
->wait
, wait
);
427 if (list
->head
!= list
->tail
)
428 return POLLIN
| POLLRDNORM
;
429 if (!list
->hiddev
->exist
)
430 return POLLERR
| POLLHUP
;
437 static noinline
int hiddev_ioctl_usage(struct hiddev
*hiddev
, unsigned int cmd
, void __user
*user_arg
)
439 struct hid_device
*hid
= hiddev
->hid
;
440 struct hiddev_report_info rinfo
;
441 struct hiddev_usage_ref_multi
*uref_multi
= NULL
;
442 struct hiddev_usage_ref
*uref
;
443 struct hid_report
*report
;
444 struct hid_field
*field
;
447 uref_multi
= kmalloc(sizeof(struct hiddev_usage_ref_multi
), GFP_KERNEL
);
450 uref
= &uref_multi
->uref
;
451 if (cmd
== HIDIOCGUSAGES
|| cmd
== HIDIOCSUSAGES
) {
452 if (copy_from_user(uref_multi
, user_arg
,
453 sizeof(*uref_multi
)))
456 if (copy_from_user(uref
, user_arg
, sizeof(*uref
)))
462 rinfo
.report_type
= uref
->report_type
;
463 rinfo
.report_id
= uref
->report_id
;
464 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
467 if (uref
->field_index
>= report
->maxfield
)
470 field
= report
->field
[uref
->field_index
];
471 if (uref
->usage_index
>= field
->maxusage
)
474 uref
->usage_code
= field
->usage
[uref
->usage_index
].hid
;
476 if (copy_to_user(user_arg
, uref
, sizeof(*uref
)))
482 if (cmd
!= HIDIOCGUSAGE
&&
483 cmd
!= HIDIOCGUSAGES
&&
484 uref
->report_type
== HID_REPORT_TYPE_INPUT
)
487 if (uref
->report_id
== HID_REPORT_ID_UNKNOWN
) {
488 field
= hiddev_lookup_usage(hid
, uref
);
492 rinfo
.report_type
= uref
->report_type
;
493 rinfo
.report_id
= uref
->report_id
;
494 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
497 if (uref
->field_index
>= report
->maxfield
)
500 field
= report
->field
[uref
->field_index
];
502 if (cmd
== HIDIOCGCOLLECTIONINDEX
) {
503 if (uref
->usage_index
>= field
->maxusage
)
505 } else if (uref
->usage_index
>= field
->report_count
)
508 else if ((cmd
== HIDIOCGUSAGES
|| cmd
== HIDIOCSUSAGES
) &&
509 (uref_multi
->num_values
> HID_MAX_MULTI_USAGES
||
510 uref
->usage_index
+ uref_multi
->num_values
> field
->report_count
))
516 uref
->value
= field
->value
[uref
->usage_index
];
517 if (copy_to_user(user_arg
, uref
, sizeof(*uref
)))
522 field
->value
[uref
->usage_index
] = uref
->value
;
525 case HIDIOCGCOLLECTIONINDEX
:
526 i
= field
->usage
[uref
->usage_index
].collection_index
;
530 for (i
= 0; i
< uref_multi
->num_values
; i
++)
531 uref_multi
->values
[i
] =
532 field
->value
[uref
->usage_index
+ i
];
533 if (copy_to_user(user_arg
, uref_multi
,
534 sizeof(*uref_multi
)))
538 for (i
= 0; i
< uref_multi
->num_values
; i
++)
539 field
->value
[uref
->usage_index
+ i
] =
540 uref_multi
->values
[i
];
556 static noinline
int hiddev_ioctl_string(struct hiddev
*hiddev
, unsigned int cmd
, void __user
*user_arg
)
558 struct hid_device
*hid
= hiddev
->hid
;
559 struct usb_device
*dev
= hid_to_usb_dev(hid
);
563 if (get_user(idx
, (int __user
*)user_arg
))
566 if ((buf
= kmalloc(HID_STRING_SIZE
, GFP_KERNEL
)) == NULL
)
569 if ((len
= usb_string(dev
, idx
, buf
, HID_STRING_SIZE
-1)) < 0) {
574 if (copy_to_user(user_arg
+sizeof(int), buf
, len
+1)) {
584 static long hiddev_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
586 struct hiddev_list
*list
= file
->private_data
;
587 struct hiddev
*hiddev
= list
->hiddev
;
588 struct hid_device
*hid
= hiddev
->hid
;
589 struct usb_device
*dev
;
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 struct usbhid_device
*usbhid
= hid
->driver_data
;
597 void __user
*user_arg
= (void __user
*)arg
;
600 /* Called without BKL by compat methods so no BKL taken */
602 /* FIXME: Who or what stop this racing with a disconnect ?? */
603 if (!hiddev
->exist
|| !hid
)
606 dev
= hid_to_usb_dev(hid
);
611 return put_user(HID_VERSION
, (int __user
*)arg
);
613 case HIDIOCAPPLICATION
:
614 if (arg
< 0 || arg
>= hid
->maxapplication
)
617 for (i
= 0; i
< hid
->maxcollection
; i
++)
618 if (hid
->collection
[i
].type
==
619 HID_COLLECTION_APPLICATION
&& arg
-- == 0)
622 if (i
== hid
->maxcollection
)
625 return hid
->collection
[i
].usage
;
628 dinfo
.bustype
= BUS_USB
;
629 dinfo
.busnum
= dev
->bus
->busnum
;
630 dinfo
.devnum
= dev
->devnum
;
631 dinfo
.ifnum
= usbhid
->ifnum
;
632 dinfo
.vendor
= le16_to_cpu(dev
->descriptor
.idVendor
);
633 dinfo
.product
= le16_to_cpu(dev
->descriptor
.idProduct
);
634 dinfo
.version
= le16_to_cpu(dev
->descriptor
.bcdDevice
);
635 dinfo
.num_applications
= hid
->maxapplication
;
636 if (copy_to_user(user_arg
, &dinfo
, sizeof(dinfo
)))
642 if (put_user(list
->flags
, (int __user
*)arg
))
650 if (get_user(newflags
, (int __user
*)arg
))
653 if ((newflags
& ~HIDDEV_FLAGS
) != 0 ||
654 ((newflags
& HIDDEV_FLAG_REPORT
) != 0 &&
655 (newflags
& HIDDEV_FLAG_UREF
) == 0))
658 list
->flags
= newflags
;
664 mutex_lock(&hiddev
->existancelock
);
666 r
= hiddev_ioctl_string(hiddev
, cmd
, user_arg
);
669 mutex_unlock(&hiddev
->existancelock
);
672 case HIDIOCINITREPORT
:
673 mutex_lock(&hiddev
->existancelock
);
674 if (!hiddev
->exist
) {
675 mutex_unlock(&hiddev
->existancelock
);
678 usbhid_init_reports(hid
);
679 mutex_unlock(&hiddev
->existancelock
);
684 if (copy_from_user(&rinfo
, user_arg
, sizeof(rinfo
)))
687 if (rinfo
.report_type
== HID_REPORT_TYPE_OUTPUT
)
690 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
693 mutex_lock(&hiddev
->existancelock
);
695 usbhid_submit_report(hid
, report
, USB_DIR_IN
);
698 mutex_unlock(&hiddev
->existancelock
);
703 if (copy_from_user(&rinfo
, user_arg
, sizeof(rinfo
)))
706 if (rinfo
.report_type
== HID_REPORT_TYPE_INPUT
)
709 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
712 mutex_lock(&hiddev
->existancelock
);
714 usbhid_submit_report(hid
, report
, USB_DIR_OUT
);
717 mutex_unlock(&hiddev
->existancelock
);
721 case HIDIOCGREPORTINFO
:
722 if (copy_from_user(&rinfo
, user_arg
, sizeof(rinfo
)))
725 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
728 rinfo
.num_fields
= report
->maxfield
;
730 if (copy_to_user(user_arg
, &rinfo
, sizeof(rinfo
)))
735 case HIDIOCGFIELDINFO
:
736 if (copy_from_user(&finfo
, user_arg
, sizeof(finfo
)))
738 rinfo
.report_type
= finfo
.report_type
;
739 rinfo
.report_id
= finfo
.report_id
;
740 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
743 if (finfo
.field_index
>= report
->maxfield
)
746 field
= report
->field
[finfo
.field_index
];
747 memset(&finfo
, 0, sizeof(finfo
));
748 finfo
.report_type
= rinfo
.report_type
;
749 finfo
.report_id
= rinfo
.report_id
;
750 finfo
.field_index
= field
->report_count
- 1;
751 finfo
.maxusage
= field
->maxusage
;
752 finfo
.flags
= field
->flags
;
753 finfo
.physical
= field
->physical
;
754 finfo
.logical
= field
->logical
;
755 finfo
.application
= field
->application
;
756 finfo
.logical_minimum
= field
->logical_minimum
;
757 finfo
.logical_maximum
= field
->logical_maximum
;
758 finfo
.physical_minimum
= field
->physical_minimum
;
759 finfo
.physical_maximum
= field
->physical_maximum
;
760 finfo
.unit_exponent
= field
->unit_exponent
;
761 finfo
.unit
= field
->unit
;
763 if (copy_to_user(user_arg
, &finfo
, sizeof(finfo
)))
774 case HIDIOCGCOLLECTIONINDEX
:
775 mutex_lock(&hiddev
->existancelock
);
777 r
= hiddev_ioctl_usage(hiddev
, cmd
, user_arg
);
780 mutex_unlock(&hiddev
->existancelock
);
783 case HIDIOCGCOLLECTIONINFO
:
784 if (copy_from_user(&cinfo
, user_arg
, sizeof(cinfo
)))
787 if (cinfo
.index
>= hid
->maxcollection
)
790 cinfo
.type
= hid
->collection
[cinfo
.index
].type
;
791 cinfo
.usage
= hid
->collection
[cinfo
.index
].usage
;
792 cinfo
.level
= hid
->collection
[cinfo
.index
].level
;
794 if (copy_to_user(user_arg
, &cinfo
, sizeof(cinfo
)))
800 if (_IOC_TYPE(cmd
) != 'H' || _IOC_DIR(cmd
) != _IOC_READ
)
803 if (_IOC_NR(cmd
) == _IOC_NR(HIDIOCGNAME(0))) {
807 len
= strlen(hid
->name
) + 1;
808 if (len
> _IOC_SIZE(cmd
))
809 len
= _IOC_SIZE(cmd
);
810 return copy_to_user(user_arg
, hid
->name
, len
) ?
814 if (_IOC_NR(cmd
) == _IOC_NR(HIDIOCGPHYS(0))) {
818 len
= strlen(hid
->phys
) + 1;
819 if (len
> _IOC_SIZE(cmd
))
820 len
= _IOC_SIZE(cmd
);
821 return copy_to_user(user_arg
, hid
->phys
, len
) ?
829 static long hiddev_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
831 return hiddev_ioctl(file
, cmd
, (unsigned long)compat_ptr(arg
));
835 static const struct file_operations hiddev_fops
= {
836 .owner
= THIS_MODULE
,
838 .write
= hiddev_write
,
841 .release
= hiddev_release
,
842 .unlocked_ioctl
= hiddev_ioctl
,
843 .fasync
= hiddev_fasync
,
845 .compat_ioctl
= hiddev_compat_ioctl
,
847 .llseek
= noop_llseek
,
850 static char *hiddev_devnode(struct device
*dev
, mode_t
*mode
)
852 return kasprintf(GFP_KERNEL
, "usb/%s", dev_name(dev
));
855 static struct usb_class_driver hiddev_class
= {
857 .devnode
= hiddev_devnode
,
858 .fops
= &hiddev_fops
,
859 .minor_base
= HIDDEV_MINOR_BASE
,
863 * This is where hid.c calls us to connect a hid device to the hiddev driver
865 int hiddev_connect(struct hid_device
*hid
, unsigned int force
)
867 struct hiddev
*hiddev
;
868 struct usbhid_device
*usbhid
= hid
->driver_data
;
873 for (i
= 0; i
< hid
->maxcollection
; i
++)
874 if (hid
->collection
[i
].type
==
875 HID_COLLECTION_APPLICATION
&&
876 !IS_INPUT_APPLICATION(hid
->collection
[i
].usage
))
879 if (i
== hid
->maxcollection
)
883 if (!(hiddev
= kzalloc(sizeof(struct hiddev
), GFP_KERNEL
)))
886 init_waitqueue_head(&hiddev
->wait
);
887 INIT_LIST_HEAD(&hiddev
->list
);
888 spin_lock_init(&hiddev
->list_lock
);
889 mutex_init(&hiddev
->existancelock
);
890 hid
->hiddev
= hiddev
;
893 retval
= usb_register_dev(usbhid
->intf
, &hiddev_class
);
895 err_hid("Not able to get a minor for this device.");
904 * This is where hid.c calls us to disconnect a hiddev device from the
905 * corresponding hid device (usually because the usb device has disconnected)
907 static struct usb_class_driver hiddev_class
;
908 void hiddev_disconnect(struct hid_device
*hid
)
910 struct hiddev
*hiddev
= hid
->hiddev
;
911 struct usbhid_device
*usbhid
= hid
->driver_data
;
913 mutex_lock(&hiddev
->existancelock
);
915 mutex_unlock(&hiddev
->existancelock
);
917 usb_deregister_dev(usbhid
->intf
, &hiddev_class
);
920 usbhid_close(hiddev
->hid
);
921 wake_up_interruptible(&hiddev
->wait
);