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 64
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
;
70 static struct hiddev
*hiddev_table
[HIDDEV_MINORS
];
73 * Find a report, given the report's type and ID. The ID can be specified
74 * indirectly by REPORT_ID_FIRST (which returns the first report of the given
75 * type) or by (REPORT_ID_NEXT | old_id), which returns the next report of the
76 * given type which follows old_id.
78 static struct hid_report
*
79 hiddev_lookup_report(struct hid_device
*hid
, struct hiddev_report_info
*rinfo
)
81 unsigned int flags
= rinfo
->report_id
& ~HID_REPORT_ID_MASK
;
82 unsigned int rid
= rinfo
->report_id
& HID_REPORT_ID_MASK
;
83 struct hid_report_enum
*report_enum
;
84 struct hid_report
*report
;
85 struct list_head
*list
;
87 if (rinfo
->report_type
< HID_REPORT_TYPE_MIN
||
88 rinfo
->report_type
> HID_REPORT_TYPE_MAX
)
91 report_enum
= hid
->report_enum
+
92 (rinfo
->report_type
- HID_REPORT_TYPE_MIN
);
95 case 0: /* Nothing to do -- report_id is already set correctly */
98 case HID_REPORT_ID_FIRST
:
99 if (list_empty(&report_enum
->report_list
))
102 list
= report_enum
->report_list
.next
;
103 report
= list_entry(list
, struct hid_report
, list
);
104 rinfo
->report_id
= report
->id
;
107 case HID_REPORT_ID_NEXT
:
108 report
= report_enum
->report_id_hash
[rid
];
112 list
= report
->list
.next
;
113 if (list
== &report_enum
->report_list
)
116 report
= list_entry(list
, struct hid_report
, list
);
117 rinfo
->report_id
= report
->id
;
124 return report_enum
->report_id_hash
[rinfo
->report_id
];
128 * Perform an exhaustive search of the report table for a usage, given its
131 static struct hid_field
*
132 hiddev_lookup_usage(struct hid_device
*hid
, struct hiddev_usage_ref
*uref
)
135 struct hid_report
*report
;
136 struct hid_report_enum
*report_enum
;
137 struct hid_field
*field
;
139 if (uref
->report_type
< HID_REPORT_TYPE_MIN
||
140 uref
->report_type
> HID_REPORT_TYPE_MAX
)
143 report_enum
= hid
->report_enum
+
144 (uref
->report_type
- HID_REPORT_TYPE_MIN
);
146 list_for_each_entry(report
, &report_enum
->report_list
, list
) {
147 for (i
= 0; i
< report
->maxfield
; i
++) {
148 field
= report
->field
[i
];
149 for (j
= 0; j
< field
->maxusage
; j
++) {
150 if (field
->usage
[j
].hid
== uref
->usage_code
) {
151 uref
->report_id
= report
->id
;
152 uref
->field_index
= i
;
153 uref
->usage_index
= j
;
163 static void hiddev_send_event(struct hid_device
*hid
,
164 struct hiddev_usage_ref
*uref
)
166 struct hiddev
*hiddev
= hid
->hiddev
;
167 struct hiddev_list
*list
;
170 spin_lock_irqsave(&hiddev
->list_lock
, flags
);
171 list_for_each_entry(list
, &hiddev
->list
, node
) {
172 if (uref
->field_index
!= HID_FIELD_INDEX_NONE
||
173 (list
->flags
& HIDDEV_FLAG_REPORT
) != 0) {
174 list
->buffer
[list
->head
] = *uref
;
175 list
->head
= (list
->head
+ 1) &
176 (HIDDEV_BUFFER_SIZE
- 1);
177 kill_fasync(&list
->fasync
, SIGIO
, POLL_IN
);
180 spin_unlock_irqrestore(&hiddev
->list_lock
, flags
);
182 wake_up_interruptible(&hiddev
->wait
);
186 * This is where hid.c calls into hiddev to pass an event that occurred over
189 void hiddev_hid_event(struct hid_device
*hid
, struct hid_field
*field
,
190 struct hid_usage
*usage
, __s32 value
)
192 unsigned type
= field
->report_type
;
193 struct hiddev_usage_ref uref
;
196 (type
== HID_INPUT_REPORT
) ? HID_REPORT_TYPE_INPUT
:
197 ((type
== HID_OUTPUT_REPORT
) ? HID_REPORT_TYPE_OUTPUT
:
198 ((type
== HID_FEATURE_REPORT
) ? HID_REPORT_TYPE_FEATURE
: 0));
199 uref
.report_id
= field
->report
->id
;
200 uref
.field_index
= field
->index
;
201 uref
.usage_index
= (usage
- field
->usage
);
202 uref
.usage_code
= usage
->hid
;
205 hiddev_send_event(hid
, &uref
);
207 EXPORT_SYMBOL_GPL(hiddev_hid_event
);
209 void hiddev_report_event(struct hid_device
*hid
, struct hid_report
*report
)
211 unsigned type
= report
->type
;
212 struct hiddev_usage_ref uref
;
214 memset(&uref
, 0, sizeof(uref
));
216 (type
== HID_INPUT_REPORT
) ? HID_REPORT_TYPE_INPUT
:
217 ((type
== HID_OUTPUT_REPORT
) ? HID_REPORT_TYPE_OUTPUT
:
218 ((type
== HID_FEATURE_REPORT
) ? HID_REPORT_TYPE_FEATURE
: 0));
219 uref
.report_id
= report
->id
;
220 uref
.field_index
= HID_FIELD_INDEX_NONE
;
222 hiddev_send_event(hid
, &uref
);
228 static int hiddev_fasync(int fd
, struct file
*file
, int on
)
231 struct hiddev_list
*list
= file
->private_data
;
233 retval
= fasync_helper(fd
, file
, on
, &list
->fasync
);
235 return retval
< 0 ? retval
: 0;
242 static int hiddev_release(struct inode
* inode
, struct file
* file
)
244 struct hiddev_list
*list
= file
->private_data
;
247 spin_lock_irqsave(&list
->hiddev
->list_lock
, flags
);
248 list_del(&list
->node
);
249 spin_unlock_irqrestore(&list
->hiddev
->list_lock
, flags
);
251 if (!--list
->hiddev
->open
) {
252 if (list
->hiddev
->exist
)
253 usbhid_close(list
->hiddev
->hid
);
266 static int hiddev_open(struct inode
*inode
, struct file
*file
)
268 struct hiddev_list
*list
;
271 int i
= iminor(inode
) - HIDDEV_MINOR_BASE
;
273 if (i
>= HIDDEV_MINORS
|| i
< 0 || !hiddev_table
[i
])
276 if (!(list
= kzalloc(sizeof(struct hiddev_list
), GFP_KERNEL
)))
278 mutex_init(&list
->thread_lock
);
280 list
->hiddev
= hiddev_table
[i
];
283 file
->private_data
= list
;
286 * no need for locking because the USB major number
287 * is shared which usbcore guards against disconnect
289 if (list
->hiddev
->exist
) {
290 if (!list
->hiddev
->open
++) {
291 res
= usbhid_open(hiddev_table
[i
]->hid
);
302 spin_lock_irq(&list
->hiddev
->list_lock
);
303 list_add_tail(&list
->node
, &hiddev_table
[i
]->list
);
304 spin_unlock_irq(&list
->hiddev
->list_lock
);
308 file
->private_data
= NULL
;
316 static ssize_t
hiddev_write(struct file
* file
, const char __user
* buffer
, size_t count
, loff_t
*ppos
)
324 static ssize_t
hiddev_read(struct file
* file
, char __user
* buffer
, size_t count
, loff_t
*ppos
)
326 DECLARE_WAITQUEUE(wait
, current
);
327 struct hiddev_list
*list
= file
->private_data
;
331 event_size
= ((list
->flags
& HIDDEV_FLAG_UREF
) != 0) ?
332 sizeof(struct hiddev_usage_ref
) : sizeof(struct hiddev_event
);
334 if (count
< event_size
)
337 /* lock against other threads */
338 retval
= mutex_lock_interruptible(&list
->thread_lock
);
342 while (retval
== 0) {
343 if (list
->head
== list
->tail
) {
344 prepare_to_wait(&list
->hiddev
->wait
, &wait
, TASK_INTERRUPTIBLE
);
346 while (list
->head
== list
->tail
) {
347 if (file
->f_flags
& O_NONBLOCK
) {
351 if (signal_pending(current
)) {
352 retval
= -ERESTARTSYS
;
355 if (!list
->hiddev
->exist
) {
360 /* let O_NONBLOCK tasks run */
361 mutex_unlock(&list
->thread_lock
);
363 if (mutex_lock_interruptible(&list
->thread_lock
))
365 set_current_state(TASK_INTERRUPTIBLE
);
367 finish_wait(&list
->hiddev
->wait
, &wait
);
372 mutex_unlock(&list
->thread_lock
);
377 while (list
->head
!= list
->tail
&&
378 retval
+ event_size
<= count
) {
379 if ((list
->flags
& HIDDEV_FLAG_UREF
) == 0) {
380 if (list
->buffer
[list
->tail
].field_index
!= HID_FIELD_INDEX_NONE
) {
381 struct hiddev_event event
;
383 event
.hid
= list
->buffer
[list
->tail
].usage_code
;
384 event
.value
= list
->buffer
[list
->tail
].value
;
385 if (copy_to_user(buffer
+ retval
, &event
, sizeof(struct hiddev_event
))) {
386 mutex_unlock(&list
->thread_lock
);
389 retval
+= sizeof(struct hiddev_event
);
392 if (list
->buffer
[list
->tail
].field_index
!= HID_FIELD_INDEX_NONE
||
393 (list
->flags
& HIDDEV_FLAG_REPORT
) != 0) {
395 if (copy_to_user(buffer
+ retval
, list
->buffer
+ list
->tail
, sizeof(struct hiddev_usage_ref
))) {
396 mutex_unlock(&list
->thread_lock
);
399 retval
+= sizeof(struct hiddev_usage_ref
);
402 list
->tail
= (list
->tail
+ 1) & (HIDDEV_BUFFER_SIZE
- 1);
406 mutex_unlock(&list
->thread_lock
);
413 * No kernel lock - fine
415 static unsigned int hiddev_poll(struct file
*file
, poll_table
*wait
)
417 struct hiddev_list
*list
= file
->private_data
;
419 poll_wait(file
, &list
->hiddev
->wait
, wait
);
420 if (list
->head
!= list
->tail
)
421 return POLLIN
| POLLRDNORM
;
422 if (!list
->hiddev
->exist
)
423 return POLLERR
| POLLHUP
;
430 static noinline
int hiddev_ioctl_usage(struct hiddev
*hiddev
, unsigned int cmd
, void __user
*user_arg
)
432 struct hid_device
*hid
= hiddev
->hid
;
433 struct hiddev_report_info rinfo
;
434 struct hiddev_usage_ref_multi
*uref_multi
= NULL
;
435 struct hiddev_usage_ref
*uref
;
436 struct hid_report
*report
;
437 struct hid_field
*field
;
440 uref_multi
= kmalloc(sizeof(struct hiddev_usage_ref_multi
), GFP_KERNEL
);
444 uref
= &uref_multi
->uref
;
445 if (cmd
== HIDIOCGUSAGES
|| cmd
== HIDIOCSUSAGES
) {
446 if (copy_from_user(uref_multi
, user_arg
,
447 sizeof(*uref_multi
)))
450 if (copy_from_user(uref
, user_arg
, sizeof(*uref
)))
456 rinfo
.report_type
= uref
->report_type
;
457 rinfo
.report_id
= uref
->report_id
;
458 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
461 if (uref
->field_index
>= report
->maxfield
)
464 field
= report
->field
[uref
->field_index
];
465 if (uref
->usage_index
>= field
->maxusage
)
468 uref
->usage_code
= field
->usage
[uref
->usage_index
].hid
;
470 if (copy_to_user(user_arg
, uref
, sizeof(*uref
)))
476 if (cmd
!= HIDIOCGUSAGE
&&
477 cmd
!= HIDIOCGUSAGES
&&
478 uref
->report_type
== HID_REPORT_TYPE_INPUT
)
481 if (uref
->report_id
== HID_REPORT_ID_UNKNOWN
) {
482 field
= hiddev_lookup_usage(hid
, uref
);
486 rinfo
.report_type
= uref
->report_type
;
487 rinfo
.report_id
= uref
->report_id
;
488 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
491 if (uref
->field_index
>= report
->maxfield
)
494 field
= report
->field
[uref
->field_index
];
496 if (cmd
== HIDIOCGCOLLECTIONINDEX
) {
497 if (uref
->usage_index
>= field
->maxusage
)
499 } else if (uref
->usage_index
>= field
->report_count
)
502 else if ((cmd
== HIDIOCGUSAGES
|| cmd
== HIDIOCSUSAGES
) &&
503 (uref_multi
->num_values
> HID_MAX_MULTI_USAGES
||
504 uref
->usage_index
+ uref_multi
->num_values
> field
->report_count
))
510 uref
->value
= field
->value
[uref
->usage_index
];
511 if (copy_to_user(user_arg
, uref
, sizeof(*uref
)))
516 field
->value
[uref
->usage_index
] = uref
->value
;
519 case HIDIOCGCOLLECTIONINDEX
:
521 return field
->usage
[uref
->usage_index
].collection_index
;
523 for (i
= 0; i
< uref_multi
->num_values
; i
++)
524 uref_multi
->values
[i
] =
525 field
->value
[uref
->usage_index
+ i
];
526 if (copy_to_user(user_arg
, uref_multi
,
527 sizeof(*uref_multi
)))
531 for (i
= 0; i
< uref_multi
->num_values
; i
++)
532 field
->value
[uref
->usage_index
+ i
] =
533 uref_multi
->values
[i
];
552 static noinline
int hiddev_ioctl_string(struct hiddev
*hiddev
, unsigned int cmd
, void __user
*user_arg
)
554 struct hid_device
*hid
= hiddev
->hid
;
555 struct usb_device
*dev
= hid_to_usb_dev(hid
);
559 if (get_user(idx
, (int __user
*)user_arg
))
562 if ((buf
= kmalloc(HID_STRING_SIZE
, GFP_KERNEL
)) == NULL
)
565 if ((len
= usb_string(dev
, idx
, buf
, HID_STRING_SIZE
-1)) < 0) {
570 if (copy_to_user(user_arg
+sizeof(int), buf
, len
+1)) {
580 static long hiddev_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
582 struct hiddev_list
*list
= file
->private_data
;
583 struct hiddev
*hiddev
= list
->hiddev
;
584 struct hid_device
*hid
= hiddev
->hid
;
585 struct usb_device
*dev
= hid_to_usb_dev(hid
);
586 struct hiddev_collection_info cinfo
;
587 struct hiddev_report_info rinfo
;
588 struct hiddev_field_info finfo
;
589 struct hiddev_devinfo dinfo
;
590 struct hid_report
*report
;
591 struct hid_field
*field
;
592 struct usbhid_device
*usbhid
= hid
->driver_data
;
593 void __user
*user_arg
= (void __user
*)arg
;
596 /* Called without BKL by compat methods so no BKL taken */
598 /* FIXME: Who or what stop this racing with a disconnect ?? */
605 return put_user(HID_VERSION
, (int __user
*)arg
);
607 case HIDIOCAPPLICATION
:
608 if (arg
< 0 || arg
>= hid
->maxapplication
)
611 for (i
= 0; i
< hid
->maxcollection
; i
++)
612 if (hid
->collection
[i
].type
==
613 HID_COLLECTION_APPLICATION
&& arg
-- == 0)
616 if (i
== hid
->maxcollection
)
619 return hid
->collection
[i
].usage
;
622 dinfo
.bustype
= BUS_USB
;
623 dinfo
.busnum
= dev
->bus
->busnum
;
624 dinfo
.devnum
= dev
->devnum
;
625 dinfo
.ifnum
= usbhid
->ifnum
;
626 dinfo
.vendor
= le16_to_cpu(dev
->descriptor
.idVendor
);
627 dinfo
.product
= le16_to_cpu(dev
->descriptor
.idProduct
);
628 dinfo
.version
= le16_to_cpu(dev
->descriptor
.bcdDevice
);
629 dinfo
.num_applications
= hid
->maxapplication
;
630 if (copy_to_user(user_arg
, &dinfo
, sizeof(dinfo
)))
636 if (put_user(list
->flags
, (int __user
*)arg
))
644 if (get_user(newflags
, (int __user
*)arg
))
647 if ((newflags
& ~HIDDEV_FLAGS
) != 0 ||
648 ((newflags
& HIDDEV_FLAG_REPORT
) != 0 &&
649 (newflags
& HIDDEV_FLAG_UREF
) == 0))
652 list
->flags
= newflags
;
658 mutex_lock(&hiddev
->existancelock
);
660 r
= hiddev_ioctl_string(hiddev
, cmd
, user_arg
);
663 mutex_unlock(&hiddev
->existancelock
);
666 case HIDIOCINITREPORT
:
667 mutex_lock(&hiddev
->existancelock
);
668 if (!hiddev
->exist
) {
669 mutex_unlock(&hiddev
->existancelock
);
672 usbhid_init_reports(hid
);
673 mutex_unlock(&hiddev
->existancelock
);
678 if (copy_from_user(&rinfo
, user_arg
, sizeof(rinfo
)))
681 if (rinfo
.report_type
== HID_REPORT_TYPE_OUTPUT
)
684 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
687 mutex_lock(&hiddev
->existancelock
);
689 usbhid_submit_report(hid
, report
, USB_DIR_IN
);
692 mutex_unlock(&hiddev
->existancelock
);
697 if (copy_from_user(&rinfo
, user_arg
, sizeof(rinfo
)))
700 if (rinfo
.report_type
== HID_REPORT_TYPE_INPUT
)
703 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
706 mutex_lock(&hiddev
->existancelock
);
708 usbhid_submit_report(hid
, report
, USB_DIR_OUT
);
711 mutex_unlock(&hiddev
->existancelock
);
715 case HIDIOCGREPORTINFO
:
716 if (copy_from_user(&rinfo
, user_arg
, sizeof(rinfo
)))
719 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
722 rinfo
.num_fields
= report
->maxfield
;
724 if (copy_to_user(user_arg
, &rinfo
, sizeof(rinfo
)))
729 case HIDIOCGFIELDINFO
:
730 if (copy_from_user(&finfo
, user_arg
, sizeof(finfo
)))
732 rinfo
.report_type
= finfo
.report_type
;
733 rinfo
.report_id
= finfo
.report_id
;
734 if ((report
= hiddev_lookup_report(hid
, &rinfo
)) == NULL
)
737 if (finfo
.field_index
>= report
->maxfield
)
740 field
= report
->field
[finfo
.field_index
];
741 memset(&finfo
, 0, sizeof(finfo
));
742 finfo
.report_type
= rinfo
.report_type
;
743 finfo
.report_id
= rinfo
.report_id
;
744 finfo
.field_index
= field
->report_count
- 1;
745 finfo
.maxusage
= field
->maxusage
;
746 finfo
.flags
= field
->flags
;
747 finfo
.physical
= field
->physical
;
748 finfo
.logical
= field
->logical
;
749 finfo
.application
= field
->application
;
750 finfo
.logical_minimum
= field
->logical_minimum
;
751 finfo
.logical_maximum
= field
->logical_maximum
;
752 finfo
.physical_minimum
= field
->physical_minimum
;
753 finfo
.physical_maximum
= field
->physical_maximum
;
754 finfo
.unit_exponent
= field
->unit_exponent
;
755 finfo
.unit
= field
->unit
;
757 if (copy_to_user(user_arg
, &finfo
, sizeof(finfo
)))
768 case HIDIOCGCOLLECTIONINDEX
:
769 mutex_lock(&hiddev
->existancelock
);
771 r
= hiddev_ioctl_usage(hiddev
, cmd
, user_arg
);
774 mutex_unlock(&hiddev
->existancelock
);
777 case HIDIOCGCOLLECTIONINFO
:
778 if (copy_from_user(&cinfo
, user_arg
, sizeof(cinfo
)))
781 if (cinfo
.index
>= hid
->maxcollection
)
784 cinfo
.type
= hid
->collection
[cinfo
.index
].type
;
785 cinfo
.usage
= hid
->collection
[cinfo
.index
].usage
;
786 cinfo
.level
= hid
->collection
[cinfo
.index
].level
;
788 if (copy_to_user(user_arg
, &cinfo
, sizeof(cinfo
)))
794 if (_IOC_TYPE(cmd
) != 'H' || _IOC_DIR(cmd
) != _IOC_READ
)
797 if (_IOC_NR(cmd
) == _IOC_NR(HIDIOCGNAME(0))) {
801 len
= strlen(hid
->name
) + 1;
802 if (len
> _IOC_SIZE(cmd
))
803 len
= _IOC_SIZE(cmd
);
804 return copy_to_user(user_arg
, hid
->name
, len
) ?
808 if (_IOC_NR(cmd
) == _IOC_NR(HIDIOCGPHYS(0))) {
812 len
= strlen(hid
->phys
) + 1;
813 if (len
> _IOC_SIZE(cmd
))
814 len
= _IOC_SIZE(cmd
);
815 return copy_to_user(user_arg
, hid
->phys
, len
) ?
823 static long hiddev_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
825 return hiddev_ioctl(file
, cmd
, (unsigned long)compat_ptr(arg
));
829 static const struct file_operations hiddev_fops
= {
830 .owner
= THIS_MODULE
,
832 .write
= hiddev_write
,
835 .release
= hiddev_release
,
836 .unlocked_ioctl
= hiddev_ioctl
,
837 .fasync
= hiddev_fasync
,
839 .compat_ioctl
= hiddev_compat_ioctl
,
843 static struct usb_class_driver hiddev_class
= {
845 .fops
= &hiddev_fops
,
846 .minor_base
= HIDDEV_MINOR_BASE
,
850 * This is where hid.c calls us to connect a hid device to the hiddev driver
852 int hiddev_connect(struct hid_device
*hid
, unsigned int force
)
854 struct hiddev
*hiddev
;
855 struct usbhid_device
*usbhid
= hid
->driver_data
;
860 for (i
= 0; i
< hid
->maxcollection
; i
++)
861 if (hid
->collection
[i
].type
==
862 HID_COLLECTION_APPLICATION
&&
863 !IS_INPUT_APPLICATION(hid
->collection
[i
].usage
))
866 if (i
== hid
->maxcollection
)
870 if (!(hiddev
= kzalloc(sizeof(struct hiddev
), GFP_KERNEL
)))
873 init_waitqueue_head(&hiddev
->wait
);
874 INIT_LIST_HEAD(&hiddev
->list
);
875 spin_lock_init(&hiddev
->list_lock
);
876 mutex_init(&hiddev
->existancelock
);
877 hid
->hiddev
= hiddev
;
881 retval
= usb_register_dev(usbhid
->intf
, &hiddev_class
);
883 err_hid("Not able to get a minor for this device.");
888 hid
->minor
= usbhid
->intf
->minor
;
889 hiddev_table
[usbhid
->intf
->minor
- HIDDEV_MINOR_BASE
] = hiddev
;
896 * This is where hid.c calls us to disconnect a hiddev device from the
897 * corresponding hid device (usually because the usb device has disconnected)
899 static struct usb_class_driver hiddev_class
;
900 void hiddev_disconnect(struct hid_device
*hid
)
902 struct hiddev
*hiddev
= hid
->hiddev
;
903 struct usbhid_device
*usbhid
= hid
->driver_data
;
905 mutex_lock(&hiddev
->existancelock
);
907 mutex_unlock(&hiddev
->existancelock
);
909 hiddev_table
[hiddev
->hid
->minor
- HIDDEV_MINOR_BASE
] = NULL
;
910 usb_deregister_dev(usbhid
->intf
, &hiddev_class
);
913 usbhid_close(hiddev
->hid
);
914 wake_up_interruptible(&hiddev
->wait
);
920 /* Currently this driver is a USB driver. It's not a conventional one in
921 * the sense that it doesn't probe at the USB level. Instead it waits to
922 * be connected by HID through the hiddev_connect / hiddev_disconnect
923 * routines. The reason to register as a USB device is to gain part of the
924 * minor number space from the USB major.
926 * In theory, should the HID code be generalized to more than one physical
927 * medium (say, IEEE 1384), this driver will probably need to register its
928 * own major number, and in doing so, no longer need to register with USB.
929 * At that point the probe routine and hiddev_driver struct below will no
934 /* We never attach in this manner, and rely on HID to connect us. This
935 * is why there is no disconnect routine defined in the usb_driver either.
937 static int hiddev_usbd_probe(struct usb_interface
*intf
,
938 const struct usb_device_id
*hiddev_info
)
944 static /* const */ struct usb_driver hiddev_driver
= {
946 .probe
= hiddev_usbd_probe
,
949 int __init
hiddev_init(void)
951 return usb_register(&hiddev_driver
);
954 void hiddev_exit(void)
956 usb_deregister(&hiddev_driver
);