2 * uvc_ctrl.c -- USB Video Class driver - Controls
4 * Copyright (C) 2005-2008
5 * Laurent Pinchart (laurent.pinchart@skynet.be)
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
14 #include <linux/kernel.h>
15 #include <linux/version.h>
16 #include <linux/list.h>
17 #include <linux/module.h>
18 #include <linux/uaccess.h>
19 #include <linux/usb.h>
20 #include <linux/videodev2.h>
21 #include <linux/vmalloc.h>
22 #include <linux/wait.h>
23 #include <asm/atomic.h>
27 #define UVC_CTRL_NDATA 2
28 #define UVC_CTRL_DATA_CURRENT 0
29 #define UVC_CTRL_DATA_BACKUP 1
31 /* ------------------------------------------------------------------------
32 * Control, formats, ...
35 static struct uvc_control_info uvc_ctrls
[] = {
37 .entity
= UVC_GUID_UVC_PROCESSING
,
38 .selector
= PU_BRIGHTNESS_CONTROL
,
41 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
42 | UVC_CONTROL_RESTORE
,
45 .entity
= UVC_GUID_UVC_PROCESSING
,
46 .selector
= PU_CONTRAST_CONTROL
,
49 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
50 | UVC_CONTROL_RESTORE
,
53 .entity
= UVC_GUID_UVC_PROCESSING
,
54 .selector
= PU_HUE_CONTROL
,
57 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
58 | UVC_CONTROL_RESTORE
| UVC_CONTROL_AUTO_UPDATE
,
61 .entity
= UVC_GUID_UVC_PROCESSING
,
62 .selector
= PU_SATURATION_CONTROL
,
65 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
66 | UVC_CONTROL_RESTORE
,
69 .entity
= UVC_GUID_UVC_PROCESSING
,
70 .selector
= PU_SHARPNESS_CONTROL
,
73 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
74 | UVC_CONTROL_RESTORE
,
77 .entity
= UVC_GUID_UVC_PROCESSING
,
78 .selector
= PU_GAMMA_CONTROL
,
81 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
82 | UVC_CONTROL_RESTORE
,
85 .entity
= UVC_GUID_UVC_PROCESSING
,
86 .selector
= PU_WHITE_BALANCE_TEMPERATURE_CONTROL
,
89 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
90 | UVC_CONTROL_RESTORE
| UVC_CONTROL_AUTO_UPDATE
,
93 .entity
= UVC_GUID_UVC_PROCESSING
,
94 .selector
= PU_WHITE_BALANCE_COMPONENT_CONTROL
,
97 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
98 | UVC_CONTROL_RESTORE
| UVC_CONTROL_AUTO_UPDATE
,
101 .entity
= UVC_GUID_UVC_PROCESSING
,
102 .selector
= PU_BACKLIGHT_COMPENSATION_CONTROL
,
105 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
106 | UVC_CONTROL_RESTORE
,
109 .entity
= UVC_GUID_UVC_PROCESSING
,
110 .selector
= PU_GAIN_CONTROL
,
113 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
114 | UVC_CONTROL_RESTORE
,
117 .entity
= UVC_GUID_UVC_PROCESSING
,
118 .selector
= PU_POWER_LINE_FREQUENCY_CONTROL
,
121 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
122 | UVC_CONTROL_RESTORE
,
125 .entity
= UVC_GUID_UVC_PROCESSING
,
126 .selector
= PU_HUE_AUTO_CONTROL
,
129 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_CUR
130 | UVC_CONTROL_GET_DEF
| UVC_CONTROL_RESTORE
,
133 .entity
= UVC_GUID_UVC_PROCESSING
,
134 .selector
= PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL
,
137 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_CUR
138 | UVC_CONTROL_GET_DEF
| UVC_CONTROL_RESTORE
,
141 .entity
= UVC_GUID_UVC_PROCESSING
,
142 .selector
= PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL
,
145 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_CUR
146 | UVC_CONTROL_GET_DEF
| UVC_CONTROL_RESTORE
,
149 .entity
= UVC_GUID_UVC_PROCESSING
,
150 .selector
= PU_DIGITAL_MULTIPLIER_CONTROL
,
153 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
154 | UVC_CONTROL_RESTORE
,
157 .entity
= UVC_GUID_UVC_PROCESSING
,
158 .selector
= PU_DIGITAL_MULTIPLIER_LIMIT_CONTROL
,
161 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
162 | UVC_CONTROL_RESTORE
,
165 .entity
= UVC_GUID_UVC_PROCESSING
,
166 .selector
= PU_ANALOG_VIDEO_STANDARD_CONTROL
,
169 .flags
= UVC_CONTROL_GET_CUR
,
172 .entity
= UVC_GUID_UVC_PROCESSING
,
173 .selector
= PU_ANALOG_LOCK_STATUS_CONTROL
,
176 .flags
= UVC_CONTROL_GET_CUR
,
179 .entity
= UVC_GUID_UVC_CAMERA
,
180 .selector
= CT_SCANNING_MODE_CONTROL
,
183 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_CUR
184 | UVC_CONTROL_RESTORE
,
187 .entity
= UVC_GUID_UVC_CAMERA
,
188 .selector
= CT_AE_MODE_CONTROL
,
191 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_CUR
192 | UVC_CONTROL_GET_DEF
| UVC_CONTROL_GET_RES
193 | UVC_CONTROL_RESTORE
,
196 .entity
= UVC_GUID_UVC_CAMERA
,
197 .selector
= CT_AE_PRIORITY_CONTROL
,
200 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_CUR
201 | UVC_CONTROL_RESTORE
,
204 .entity
= UVC_GUID_UVC_CAMERA
,
205 .selector
= CT_EXPOSURE_TIME_ABSOLUTE_CONTROL
,
208 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
209 | UVC_CONTROL_RESTORE
,
212 .entity
= UVC_GUID_UVC_CAMERA
,
213 .selector
= CT_EXPOSURE_TIME_RELATIVE_CONTROL
,
216 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_CUR
217 | UVC_CONTROL_RESTORE
,
220 .entity
= UVC_GUID_UVC_CAMERA
,
221 .selector
= CT_FOCUS_ABSOLUTE_CONTROL
,
224 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
225 | UVC_CONTROL_RESTORE
| UVC_CONTROL_AUTO_UPDATE
,
228 .entity
= UVC_GUID_UVC_CAMERA
,
229 .selector
= CT_FOCUS_RELATIVE_CONTROL
,
232 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
233 | UVC_CONTROL_AUTO_UPDATE
,
236 .entity
= UVC_GUID_UVC_CAMERA
,
237 .selector
= CT_IRIS_ABSOLUTE_CONTROL
,
240 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
241 | UVC_CONTROL_RESTORE
| UVC_CONTROL_AUTO_UPDATE
,
244 .entity
= UVC_GUID_UVC_CAMERA
,
245 .selector
= CT_IRIS_RELATIVE_CONTROL
,
248 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_CUR
249 | UVC_CONTROL_AUTO_UPDATE
,
252 .entity
= UVC_GUID_UVC_CAMERA
,
253 .selector
= CT_ZOOM_ABSOLUTE_CONTROL
,
256 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
257 | UVC_CONTROL_RESTORE
| UVC_CONTROL_AUTO_UPDATE
,
260 .entity
= UVC_GUID_UVC_CAMERA
,
261 .selector
= CT_ZOOM_RELATIVE_CONTROL
,
264 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
265 | UVC_CONTROL_AUTO_UPDATE
,
268 .entity
= UVC_GUID_UVC_CAMERA
,
269 .selector
= CT_PANTILT_ABSOLUTE_CONTROL
,
272 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
273 | UVC_CONTROL_RESTORE
| UVC_CONTROL_AUTO_UPDATE
,
276 .entity
= UVC_GUID_UVC_CAMERA
,
277 .selector
= CT_PANTILT_RELATIVE_CONTROL
,
280 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
281 | UVC_CONTROL_AUTO_UPDATE
,
284 .entity
= UVC_GUID_UVC_CAMERA
,
285 .selector
= CT_ROLL_ABSOLUTE_CONTROL
,
288 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
289 | UVC_CONTROL_RESTORE
| UVC_CONTROL_AUTO_UPDATE
,
292 .entity
= UVC_GUID_UVC_CAMERA
,
293 .selector
= CT_ROLL_RELATIVE_CONTROL
,
296 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_RANGE
297 | UVC_CONTROL_AUTO_UPDATE
,
300 .entity
= UVC_GUID_UVC_CAMERA
,
301 .selector
= CT_FOCUS_AUTO_CONTROL
,
304 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_CUR
305 | UVC_CONTROL_GET_DEF
| UVC_CONTROL_RESTORE
,
308 .entity
= UVC_GUID_UVC_CAMERA
,
309 .selector
= CT_PRIVACY_CONTROL
,
312 .flags
= UVC_CONTROL_SET_CUR
| UVC_CONTROL_GET_CUR
313 | UVC_CONTROL_RESTORE
| UVC_CONTROL_AUTO_UPDATE
,
317 static struct uvc_menu_info power_line_frequency_controls
[] = {
323 static struct uvc_menu_info exposure_auto_controls
[] = {
325 { 1, "Manual Mode" },
326 { 4, "Shutter Priority Mode" },
327 { 8, "Aperture Priority Mode" },
330 static __s32
uvc_ctrl_get_zoom(struct uvc_control_mapping
*mapping
,
331 __u8 query
, const __u8
*data
)
333 __s8 zoom
= (__s8
)data
[0];
337 return (zoom
== 0) ? 0 : (zoom
> 0 ? data
[2] : -data
[2]);
348 static void uvc_ctrl_set_zoom(struct uvc_control_mapping
*mapping
,
349 __s32 value
, __u8
*data
)
351 data
[0] = value
== 0 ? 0 : (value
> 0) ? 1 : 0xff;
352 data
[2] = min(abs(value
), 0xff);
355 static struct uvc_control_mapping uvc_ctrl_mappings
[] = {
357 .id
= V4L2_CID_BRIGHTNESS
,
358 .name
= "Brightness",
359 .entity
= UVC_GUID_UVC_PROCESSING
,
360 .selector
= PU_BRIGHTNESS_CONTROL
,
363 .v4l2_type
= V4L2_CTRL_TYPE_INTEGER
,
364 .data_type
= UVC_CTRL_DATA_TYPE_SIGNED
,
367 .id
= V4L2_CID_CONTRAST
,
369 .entity
= UVC_GUID_UVC_PROCESSING
,
370 .selector
= PU_CONTRAST_CONTROL
,
373 .v4l2_type
= V4L2_CTRL_TYPE_INTEGER
,
374 .data_type
= UVC_CTRL_DATA_TYPE_UNSIGNED
,
379 .entity
= UVC_GUID_UVC_PROCESSING
,
380 .selector
= PU_HUE_CONTROL
,
383 .v4l2_type
= V4L2_CTRL_TYPE_INTEGER
,
384 .data_type
= UVC_CTRL_DATA_TYPE_SIGNED
,
387 .id
= V4L2_CID_SATURATION
,
388 .name
= "Saturation",
389 .entity
= UVC_GUID_UVC_PROCESSING
,
390 .selector
= PU_SATURATION_CONTROL
,
393 .v4l2_type
= V4L2_CTRL_TYPE_INTEGER
,
394 .data_type
= UVC_CTRL_DATA_TYPE_UNSIGNED
,
397 .id
= V4L2_CID_SHARPNESS
,
399 .entity
= UVC_GUID_UVC_PROCESSING
,
400 .selector
= PU_SHARPNESS_CONTROL
,
403 .v4l2_type
= V4L2_CTRL_TYPE_INTEGER
,
404 .data_type
= UVC_CTRL_DATA_TYPE_UNSIGNED
,
407 .id
= V4L2_CID_GAMMA
,
409 .entity
= UVC_GUID_UVC_PROCESSING
,
410 .selector
= PU_GAMMA_CONTROL
,
413 .v4l2_type
= V4L2_CTRL_TYPE_INTEGER
,
414 .data_type
= UVC_CTRL_DATA_TYPE_UNSIGNED
,
417 .id
= V4L2_CID_BACKLIGHT_COMPENSATION
,
418 .name
= "Backlight Compensation",
419 .entity
= UVC_GUID_UVC_PROCESSING
,
420 .selector
= PU_BACKLIGHT_COMPENSATION_CONTROL
,
423 .v4l2_type
= V4L2_CTRL_TYPE_INTEGER
,
424 .data_type
= UVC_CTRL_DATA_TYPE_UNSIGNED
,
429 .entity
= UVC_GUID_UVC_PROCESSING
,
430 .selector
= PU_GAIN_CONTROL
,
433 .v4l2_type
= V4L2_CTRL_TYPE_INTEGER
,
434 .data_type
= UVC_CTRL_DATA_TYPE_UNSIGNED
,
437 .id
= V4L2_CID_POWER_LINE_FREQUENCY
,
438 .name
= "Power Line Frequency",
439 .entity
= UVC_GUID_UVC_PROCESSING
,
440 .selector
= PU_POWER_LINE_FREQUENCY_CONTROL
,
443 .v4l2_type
= V4L2_CTRL_TYPE_MENU
,
444 .data_type
= UVC_CTRL_DATA_TYPE_ENUM
,
445 .menu_info
= power_line_frequency_controls
,
446 .menu_count
= ARRAY_SIZE(power_line_frequency_controls
),
449 .id
= V4L2_CID_HUE_AUTO
,
451 .entity
= UVC_GUID_UVC_PROCESSING
,
452 .selector
= PU_HUE_AUTO_CONTROL
,
455 .v4l2_type
= V4L2_CTRL_TYPE_BOOLEAN
,
456 .data_type
= UVC_CTRL_DATA_TYPE_BOOLEAN
,
459 .id
= V4L2_CID_EXPOSURE_AUTO
,
460 .name
= "Exposure, Auto",
461 .entity
= UVC_GUID_UVC_CAMERA
,
462 .selector
= CT_AE_MODE_CONTROL
,
465 .v4l2_type
= V4L2_CTRL_TYPE_MENU
,
466 .data_type
= UVC_CTRL_DATA_TYPE_BITMASK
,
467 .menu_info
= exposure_auto_controls
,
468 .menu_count
= ARRAY_SIZE(exposure_auto_controls
),
471 .id
= V4L2_CID_EXPOSURE_AUTO_PRIORITY
,
472 .name
= "Exposure, Auto Priority",
473 .entity
= UVC_GUID_UVC_CAMERA
,
474 .selector
= CT_AE_PRIORITY_CONTROL
,
477 .v4l2_type
= V4L2_CTRL_TYPE_BOOLEAN
,
478 .data_type
= UVC_CTRL_DATA_TYPE_BOOLEAN
,
481 .id
= V4L2_CID_EXPOSURE_ABSOLUTE
,
482 .name
= "Exposure (Absolute)",
483 .entity
= UVC_GUID_UVC_CAMERA
,
484 .selector
= CT_EXPOSURE_TIME_ABSOLUTE_CONTROL
,
487 .v4l2_type
= V4L2_CTRL_TYPE_INTEGER
,
488 .data_type
= UVC_CTRL_DATA_TYPE_UNSIGNED
,
491 .id
= V4L2_CID_AUTO_WHITE_BALANCE
,
492 .name
= "White Balance Temperature, Auto",
493 .entity
= UVC_GUID_UVC_PROCESSING
,
494 .selector
= PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL
,
497 .v4l2_type
= V4L2_CTRL_TYPE_BOOLEAN
,
498 .data_type
= UVC_CTRL_DATA_TYPE_BOOLEAN
,
501 .id
= V4L2_CID_WHITE_BALANCE_TEMPERATURE
,
502 .name
= "White Balance Temperature",
503 .entity
= UVC_GUID_UVC_PROCESSING
,
504 .selector
= PU_WHITE_BALANCE_TEMPERATURE_CONTROL
,
507 .v4l2_type
= V4L2_CTRL_TYPE_INTEGER
,
508 .data_type
= UVC_CTRL_DATA_TYPE_UNSIGNED
,
511 .id
= V4L2_CID_AUTO_WHITE_BALANCE
,
512 .name
= "White Balance Component, Auto",
513 .entity
= UVC_GUID_UVC_PROCESSING
,
514 .selector
= PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL
,
517 .v4l2_type
= V4L2_CTRL_TYPE_BOOLEAN
,
518 .data_type
= UVC_CTRL_DATA_TYPE_BOOLEAN
,
521 .id
= V4L2_CID_BLUE_BALANCE
,
522 .name
= "White Balance Blue Component",
523 .entity
= UVC_GUID_UVC_PROCESSING
,
524 .selector
= PU_WHITE_BALANCE_COMPONENT_CONTROL
,
527 .v4l2_type
= V4L2_CTRL_TYPE_INTEGER
,
528 .data_type
= UVC_CTRL_DATA_TYPE_SIGNED
,
531 .id
= V4L2_CID_RED_BALANCE
,
532 .name
= "White Balance Red Component",
533 .entity
= UVC_GUID_UVC_PROCESSING
,
534 .selector
= PU_WHITE_BALANCE_COMPONENT_CONTROL
,
537 .v4l2_type
= V4L2_CTRL_TYPE_INTEGER
,
538 .data_type
= UVC_CTRL_DATA_TYPE_SIGNED
,
541 .id
= V4L2_CID_FOCUS_ABSOLUTE
,
542 .name
= "Focus (absolute)",
543 .entity
= UVC_GUID_UVC_CAMERA
,
544 .selector
= CT_FOCUS_ABSOLUTE_CONTROL
,
547 .v4l2_type
= V4L2_CTRL_TYPE_INTEGER
,
548 .data_type
= UVC_CTRL_DATA_TYPE_UNSIGNED
,
551 .id
= V4L2_CID_FOCUS_AUTO
,
552 .name
= "Focus, Auto",
553 .entity
= UVC_GUID_UVC_CAMERA
,
554 .selector
= CT_FOCUS_AUTO_CONTROL
,
557 .v4l2_type
= V4L2_CTRL_TYPE_BOOLEAN
,
558 .data_type
= UVC_CTRL_DATA_TYPE_BOOLEAN
,
561 .id
= V4L2_CID_ZOOM_ABSOLUTE
,
562 .name
= "Zoom, Absolute",
563 .entity
= UVC_GUID_UVC_CAMERA
,
564 .selector
= CT_ZOOM_ABSOLUTE_CONTROL
,
567 .v4l2_type
= V4L2_CTRL_TYPE_INTEGER
,
568 .data_type
= UVC_CTRL_DATA_TYPE_UNSIGNED
,
571 .id
= V4L2_CID_ZOOM_CONTINUOUS
,
572 .name
= "Zoom, Continuous",
573 .entity
= UVC_GUID_UVC_CAMERA
,
574 .selector
= CT_ZOOM_RELATIVE_CONTROL
,
577 .v4l2_type
= V4L2_CTRL_TYPE_INTEGER
,
578 .data_type
= UVC_CTRL_DATA_TYPE_SIGNED
,
579 .get
= uvc_ctrl_get_zoom
,
580 .set
= uvc_ctrl_set_zoom
,
583 .id
= V4L2_CID_PRIVACY
,
585 .entity
= UVC_GUID_UVC_CAMERA
,
586 .selector
= CT_PRIVACY_CONTROL
,
589 .v4l2_type
= V4L2_CTRL_TYPE_BOOLEAN
,
590 .data_type
= UVC_CTRL_DATA_TYPE_BOOLEAN
,
594 /* ------------------------------------------------------------------------
598 static inline __u8
*uvc_ctrl_data(struct uvc_control
*ctrl
, int id
)
600 return ctrl
->data
+ id
* ctrl
->info
->size
;
603 static inline int uvc_test_bit(const __u8
*data
, int bit
)
605 return (data
[bit
>> 3] >> (bit
& 7)) & 1;
608 static inline void uvc_clear_bit(__u8
*data
, int bit
)
610 data
[bit
>> 3] &= ~(1 << (bit
& 7));
613 /* Extract the bit string specified by mapping->offset and mapping->size
614 * from the little-endian data stored at 'data' and return the result as
615 * a signed 32bit integer. Sign extension will be performed if the mapping
616 * references a signed data type.
618 static __s32
uvc_get_le_value(struct uvc_control_mapping
*mapping
,
619 __u8 query
, const __u8
*data
)
621 int bits
= mapping
->size
;
622 int offset
= mapping
->offset
;
628 mask
= ((1LL << bits
) - 1) << offset
;
630 for (; bits
> 0; data
++) {
631 __u8 byte
= *data
& mask
;
632 value
|= offset
> 0 ? (byte
>> offset
) : (byte
<< (-offset
));
633 bits
-= 8 - (offset
> 0 ? offset
: 0);
635 mask
= (1 << bits
) - 1;
638 /* Sign-extend the value if needed */
639 if (mapping
->data_type
== UVC_CTRL_DATA_TYPE_SIGNED
)
640 value
|= -(value
& (1 << (mapping
->size
- 1)));
645 /* Set the bit string specified by mapping->offset and mapping->size
646 * in the little-endian data stored at 'data' to the value 'value'.
648 static void uvc_set_le_value(struct uvc_control_mapping
*mapping
,
649 __s32 value
, __u8
*data
)
651 int bits
= mapping
->size
;
652 int offset
= mapping
->offset
;
658 for (; bits
> 0; data
++) {
659 mask
= ((1LL << bits
) - 1) << offset
;
660 *data
= (*data
& ~mask
) | ((value
<< offset
) & mask
);
661 value
>>= offset
? offset
: 8;
667 /* ------------------------------------------------------------------------
668 * Terminal and unit management
671 static const __u8 uvc_processing_guid
[16] = UVC_GUID_UVC_PROCESSING
;
672 static const __u8 uvc_camera_guid
[16] = UVC_GUID_UVC_CAMERA
;
673 static const __u8 uvc_media_transport_input_guid
[16] =
674 UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT
;
676 static int uvc_entity_match_guid(struct uvc_entity
*entity
, __u8 guid
[16])
678 switch (UVC_ENTITY_TYPE(entity
)) {
680 return memcmp(uvc_camera_guid
, guid
, 16) == 0;
682 case ITT_MEDIA_TRANSPORT_INPUT
:
683 return memcmp(uvc_media_transport_input_guid
, guid
, 16) == 0;
685 case VC_PROCESSING_UNIT
:
686 return memcmp(uvc_processing_guid
, guid
, 16) == 0;
688 case VC_EXTENSION_UNIT
:
689 return memcmp(entity
->extension
.guidExtensionCode
,
697 /* ------------------------------------------------------------------------
701 static void __uvc_find_control(struct uvc_entity
*entity
, __u32 v4l2_id
,
702 struct uvc_control_mapping
**mapping
, struct uvc_control
**control
,
705 struct uvc_control
*ctrl
;
706 struct uvc_control_mapping
*map
;
712 for (i
= 0; i
< entity
->ncontrols
; ++i
) {
713 ctrl
= &entity
->controls
[i
];
714 if (ctrl
->info
== NULL
)
717 list_for_each_entry(map
, &ctrl
->info
->mappings
, list
) {
718 if ((map
->id
== v4l2_id
) && !next
) {
724 if ((*mapping
== NULL
|| (*mapping
)->id
> map
->id
) &&
725 (map
->id
> v4l2_id
) && next
) {
733 struct uvc_control
*uvc_find_control(struct uvc_video_device
*video
,
734 __u32 v4l2_id
, struct uvc_control_mapping
**mapping
)
736 struct uvc_control
*ctrl
= NULL
;
737 struct uvc_entity
*entity
;
738 int next
= v4l2_id
& V4L2_CTRL_FLAG_NEXT_CTRL
;
742 /* Mask the query flags. */
743 v4l2_id
&= V4L2_CTRL_ID_MASK
;
745 /* Find the control. */
746 __uvc_find_control(video
->processing
, v4l2_id
, mapping
, &ctrl
, next
);
750 list_for_each_entry(entity
, &video
->iterms
, chain
) {
751 __uvc_find_control(entity
, v4l2_id
, mapping
, &ctrl
, next
);
756 list_for_each_entry(entity
, &video
->extensions
, chain
) {
757 __uvc_find_control(entity
, v4l2_id
, mapping
, &ctrl
, next
);
762 if (ctrl
== NULL
&& !next
)
763 uvc_trace(UVC_TRACE_CONTROL
, "Control 0x%08x not found.\n",
769 int uvc_query_v4l2_ctrl(struct uvc_video_device
*video
,
770 struct v4l2_queryctrl
*v4l2_ctrl
)
772 struct uvc_control
*ctrl
;
773 struct uvc_control_mapping
*mapping
;
774 struct uvc_menu_info
*menu
;
779 ctrl
= uvc_find_control(video
, v4l2_ctrl
->id
, &mapping
);
783 data
= kmalloc(ctrl
->info
->size
, GFP_KERNEL
);
787 memset(v4l2_ctrl
, 0, sizeof *v4l2_ctrl
);
788 v4l2_ctrl
->id
= mapping
->id
;
789 v4l2_ctrl
->type
= mapping
->v4l2_type
;
790 strncpy(v4l2_ctrl
->name
, mapping
->name
, sizeof v4l2_ctrl
->name
);
791 v4l2_ctrl
->flags
= 0;
793 if (!(ctrl
->info
->flags
& UVC_CONTROL_SET_CUR
))
794 v4l2_ctrl
->flags
|= V4L2_CTRL_FLAG_READ_ONLY
;
796 if (ctrl
->info
->flags
& UVC_CONTROL_GET_DEF
) {
797 if ((ret
= uvc_query_ctrl(video
->dev
, GET_DEF
, ctrl
->entity
->id
,
798 video
->dev
->intfnum
, ctrl
->info
->selector
,
799 data
, ctrl
->info
->size
)) < 0)
801 v4l2_ctrl
->default_value
= mapping
->get(mapping
, GET_DEF
, data
);
804 switch (mapping
->v4l2_type
) {
805 case V4L2_CTRL_TYPE_MENU
:
806 v4l2_ctrl
->minimum
= 0;
807 v4l2_ctrl
->maximum
= mapping
->menu_count
- 1;
810 menu
= mapping
->menu_info
;
811 for (i
= 0; i
< mapping
->menu_count
; ++i
, ++menu
) {
812 if (menu
->value
== v4l2_ctrl
->default_value
) {
813 v4l2_ctrl
->default_value
= i
;
821 case V4L2_CTRL_TYPE_BOOLEAN
:
822 v4l2_ctrl
->minimum
= 0;
823 v4l2_ctrl
->maximum
= 1;
832 if (ctrl
->info
->flags
& UVC_CONTROL_GET_MIN
) {
833 if ((ret
= uvc_query_ctrl(video
->dev
, GET_MIN
, ctrl
->entity
->id
,
834 video
->dev
->intfnum
, ctrl
->info
->selector
,
835 data
, ctrl
->info
->size
)) < 0)
837 v4l2_ctrl
->minimum
= mapping
->get(mapping
, GET_MIN
, data
);
839 if (ctrl
->info
->flags
& UVC_CONTROL_GET_MAX
) {
840 if ((ret
= uvc_query_ctrl(video
->dev
, GET_MAX
, ctrl
->entity
->id
,
841 video
->dev
->intfnum
, ctrl
->info
->selector
,
842 data
, ctrl
->info
->size
)) < 0)
844 v4l2_ctrl
->maximum
= mapping
->get(mapping
, GET_MAX
, data
);
846 if (ctrl
->info
->flags
& UVC_CONTROL_GET_RES
) {
847 if ((ret
= uvc_query_ctrl(video
->dev
, GET_RES
, ctrl
->entity
->id
,
848 video
->dev
->intfnum
, ctrl
->info
->selector
,
849 data
, ctrl
->info
->size
)) < 0)
851 v4l2_ctrl
->step
= mapping
->get(mapping
, GET_RES
, data
);
861 /* --------------------------------------------------------------------------
862 * Control transactions
864 * To make extended set operations as atomic as the hardware allows, controls
865 * are handled using begin/commit/rollback operations.
867 * At the beginning of a set request, uvc_ctrl_begin should be called to
868 * initialize the request. This function acquires the control lock.
870 * When setting a control, the new value is stored in the control data field
871 * at position UVC_CTRL_DATA_CURRENT. The control is then marked as dirty for
872 * later processing. If the UVC and V4L2 control sizes differ, the current
873 * value is loaded from the hardware before storing the new value in the data
876 * After processing all controls in the transaction, uvc_ctrl_commit or
877 * uvc_ctrl_rollback must be called to apply the pending changes to the
878 * hardware or revert them. When applying changes, all controls marked as
879 * dirty will be modified in the UVC device, and the dirty flag will be
880 * cleared. When reverting controls, the control data field
881 * UVC_CTRL_DATA_CURRENT is reverted to its previous value
882 * (UVC_CTRL_DATA_BACKUP) for all dirty controls. Both functions release the
885 int uvc_ctrl_begin(struct uvc_video_device
*video
)
887 return mutex_lock_interruptible(&video
->ctrl_mutex
) ? -ERESTARTSYS
: 0;
890 static int uvc_ctrl_commit_entity(struct uvc_device
*dev
,
891 struct uvc_entity
*entity
, int rollback
)
893 struct uvc_control
*ctrl
;
900 for (i
= 0; i
< entity
->ncontrols
; ++i
) {
901 ctrl
= &entity
->controls
[i
];
902 if (ctrl
->info
== NULL
)
905 /* Reset the loaded flag for auto-update controls that were
906 * marked as loaded in uvc_ctrl_get/uvc_ctrl_set to prevent
907 * uvc_ctrl_get from using the cached value.
909 if (ctrl
->info
->flags
& UVC_CONTROL_AUTO_UPDATE
)
916 ret
= uvc_query_ctrl(dev
, SET_CUR
, ctrl
->entity
->id
,
917 dev
->intfnum
, ctrl
->info
->selector
,
918 uvc_ctrl_data(ctrl
, UVC_CTRL_DATA_CURRENT
),
923 if (rollback
|| ret
< 0)
924 memcpy(uvc_ctrl_data(ctrl
, UVC_CTRL_DATA_CURRENT
),
925 uvc_ctrl_data(ctrl
, UVC_CTRL_DATA_BACKUP
),
937 int __uvc_ctrl_commit(struct uvc_video_device
*video
, int rollback
)
939 struct uvc_entity
*entity
;
942 /* Find the control. */
943 ret
= uvc_ctrl_commit_entity(video
->dev
, video
->processing
, rollback
);
947 list_for_each_entry(entity
, &video
->iterms
, chain
) {
948 ret
= uvc_ctrl_commit_entity(video
->dev
, entity
, rollback
);
953 list_for_each_entry(entity
, &video
->extensions
, chain
) {
954 ret
= uvc_ctrl_commit_entity(video
->dev
, entity
, rollback
);
960 mutex_unlock(&video
->ctrl_mutex
);
964 int uvc_ctrl_get(struct uvc_video_device
*video
,
965 struct v4l2_ext_control
*xctrl
)
967 struct uvc_control
*ctrl
;
968 struct uvc_control_mapping
*mapping
;
969 struct uvc_menu_info
*menu
;
973 ctrl
= uvc_find_control(video
, xctrl
->id
, &mapping
);
974 if (ctrl
== NULL
|| (ctrl
->info
->flags
& UVC_CONTROL_GET_CUR
) == 0)
978 ret
= uvc_query_ctrl(video
->dev
, GET_CUR
, ctrl
->entity
->id
,
979 video
->dev
->intfnum
, ctrl
->info
->selector
,
980 uvc_ctrl_data(ctrl
, UVC_CTRL_DATA_CURRENT
),
988 xctrl
->value
= mapping
->get(mapping
, GET_CUR
,
989 uvc_ctrl_data(ctrl
, UVC_CTRL_DATA_CURRENT
));
991 if (mapping
->v4l2_type
== V4L2_CTRL_TYPE_MENU
) {
992 menu
= mapping
->menu_info
;
993 for (i
= 0; i
< mapping
->menu_count
; ++i
, ++menu
) {
994 if (menu
->value
== xctrl
->value
) {
1004 int uvc_ctrl_set(struct uvc_video_device
*video
,
1005 struct v4l2_ext_control
*xctrl
)
1007 struct uvc_control
*ctrl
;
1008 struct uvc_control_mapping
*mapping
;
1009 s32 value
= xctrl
->value
;
1012 ctrl
= uvc_find_control(video
, xctrl
->id
, &mapping
);
1013 if (ctrl
== NULL
|| (ctrl
->info
->flags
& UVC_CONTROL_SET_CUR
) == 0)
1016 if (mapping
->v4l2_type
== V4L2_CTRL_TYPE_MENU
) {
1017 if (value
< 0 || value
>= mapping
->menu_count
)
1019 value
= mapping
->menu_info
[value
].value
;
1022 if (!ctrl
->loaded
&& (ctrl
->info
->size
* 8) != mapping
->size
) {
1023 if ((ctrl
->info
->flags
& UVC_CONTROL_GET_CUR
) == 0) {
1024 memset(uvc_ctrl_data(ctrl
, UVC_CTRL_DATA_CURRENT
),
1025 0, ctrl
->info
->size
);
1027 ret
= uvc_query_ctrl(video
->dev
, GET_CUR
,
1028 ctrl
->entity
->id
, video
->dev
->intfnum
,
1029 ctrl
->info
->selector
,
1030 uvc_ctrl_data(ctrl
, UVC_CTRL_DATA_CURRENT
),
1040 memcpy(uvc_ctrl_data(ctrl
, UVC_CTRL_DATA_BACKUP
),
1041 uvc_ctrl_data(ctrl
, UVC_CTRL_DATA_CURRENT
),
1045 mapping
->set(mapping
, value
,
1046 uvc_ctrl_data(ctrl
, UVC_CTRL_DATA_CURRENT
));
1053 /* --------------------------------------------------------------------------
1057 int uvc_xu_ctrl_query(struct uvc_video_device
*video
,
1058 struct uvc_xu_control
*xctrl
, int set
)
1060 struct uvc_entity
*entity
;
1061 struct uvc_control
*ctrl
= NULL
;
1062 unsigned int i
, found
= 0;
1066 /* Find the extension unit. */
1067 list_for_each_entry(entity
, &video
->extensions
, chain
) {
1068 if (entity
->id
== xctrl
->unit
)
1072 if (entity
->id
!= xctrl
->unit
) {
1073 uvc_trace(UVC_TRACE_CONTROL
, "Extension unit %u not found.\n",
1078 /* Find the control. */
1079 for (i
= 0; i
< entity
->ncontrols
; ++i
) {
1080 ctrl
= &entity
->controls
[i
];
1081 if (ctrl
->info
== NULL
)
1084 if (ctrl
->info
->selector
== xctrl
->selector
) {
1091 uvc_trace(UVC_TRACE_CONTROL
,
1092 "Control " UVC_GUID_FORMAT
"/%u not found.\n",
1093 UVC_GUID_ARGS(entity
->extension
.guidExtensionCode
),
1098 /* Validate control data size. */
1099 if (ctrl
->info
->size
!= xctrl
->size
)
1102 if ((set
&& !(ctrl
->info
->flags
& UVC_CONTROL_SET_CUR
)) ||
1103 (!set
&& !(ctrl
->info
->flags
& UVC_CONTROL_GET_CUR
)))
1106 if (mutex_lock_interruptible(&video
->ctrl_mutex
))
1107 return -ERESTARTSYS
;
1109 memcpy(uvc_ctrl_data(ctrl
, UVC_CTRL_DATA_BACKUP
),
1110 uvc_ctrl_data(ctrl
, UVC_CTRL_DATA_CURRENT
),
1112 data
= uvc_ctrl_data(ctrl
, UVC_CTRL_DATA_CURRENT
);
1114 if (set
&& copy_from_user(data
, xctrl
->data
, xctrl
->size
)) {
1119 ret
= uvc_query_ctrl(video
->dev
, set
? SET_CUR
: GET_CUR
, xctrl
->unit
,
1120 video
->dev
->intfnum
, xctrl
->selector
, data
,
1125 if (!set
&& copy_to_user(xctrl
->data
, data
, xctrl
->size
)) {
1132 memcpy(uvc_ctrl_data(ctrl
, UVC_CTRL_DATA_CURRENT
),
1133 uvc_ctrl_data(ctrl
, UVC_CTRL_DATA_BACKUP
),
1136 mutex_unlock(&video
->ctrl_mutex
);
1140 /* --------------------------------------------------------------------------
1145 * Restore control values after resume, skipping controls that haven't been
1149 * - Don't restore modified controls that are back to their default value.
1150 * - Handle restore order (Auto-Exposure Mode should be restored before
1153 int uvc_ctrl_resume_device(struct uvc_device
*dev
)
1155 struct uvc_control
*ctrl
;
1156 struct uvc_entity
*entity
;
1160 /* Walk the entities list and restore controls when possible. */
1161 list_for_each_entry(entity
, &dev
->entities
, list
) {
1163 for (i
= 0; i
< entity
->ncontrols
; ++i
) {
1164 ctrl
= &entity
->controls
[i
];
1166 if (ctrl
->info
== NULL
|| !ctrl
->modified
||
1167 (ctrl
->info
->flags
& UVC_CONTROL_RESTORE
) == 0)
1170 printk(KERN_INFO
"restoring control " UVC_GUID_FORMAT
1171 "/%u/%u\n", UVC_GUID_ARGS(ctrl
->info
->entity
),
1172 ctrl
->info
->index
, ctrl
->info
->selector
);
1176 ret
= uvc_ctrl_commit_entity(dev
, entity
, 0);
1184 /* --------------------------------------------------------------------------
1185 * Control and mapping handling
1188 static void uvc_ctrl_add_ctrl(struct uvc_device
*dev
,
1189 struct uvc_control_info
*info
)
1191 struct uvc_entity
*entity
;
1192 struct uvc_control
*ctrl
= NULL
;
1196 list_for_each_entry(entity
, &dev
->entities
, list
) {
1197 if (!uvc_entity_match_guid(entity
, info
->entity
))
1200 for (i
= 0; i
< entity
->ncontrols
; ++i
) {
1201 ctrl
= &entity
->controls
[i
];
1202 if (ctrl
->index
== info
->index
) {
1215 if (UVC_ENTITY_TYPE(entity
) == VC_EXTENSION_UNIT
) {
1216 /* Check if the device control information and length match
1217 * the user supplied information.
1223 if ((ret
= uvc_query_ctrl(dev
, GET_LEN
, ctrl
->entity
->id
,
1224 dev
->intfnum
, info
->selector
, (__u8
*)&size
, 2)) < 0) {
1225 uvc_trace(UVC_TRACE_CONTROL
, "GET_LEN failed on "
1226 "control " UVC_GUID_FORMAT
"/%u (%d).\n",
1227 UVC_GUID_ARGS(info
->entity
), info
->selector
,
1232 if (info
->size
!= le16_to_cpu(size
)) {
1233 uvc_trace(UVC_TRACE_CONTROL
, "Control " UVC_GUID_FORMAT
1234 "/%u size doesn't match user supplied "
1235 "value.\n", UVC_GUID_ARGS(info
->entity
),
1240 if ((ret
= uvc_query_ctrl(dev
, GET_INFO
, ctrl
->entity
->id
,
1241 dev
->intfnum
, info
->selector
, &inf
, 1)) < 0) {
1242 uvc_trace(UVC_TRACE_CONTROL
, "GET_INFO failed on "
1243 "control " UVC_GUID_FORMAT
"/%u (%d).\n",
1244 UVC_GUID_ARGS(info
->entity
), info
->selector
,
1249 flags
= info
->flags
;
1250 if (((flags
& UVC_CONTROL_GET_CUR
) && !(inf
& (1 << 0))) ||
1251 ((flags
& UVC_CONTROL_SET_CUR
) && !(inf
& (1 << 1)))) {
1252 uvc_trace(UVC_TRACE_CONTROL
, "Control "
1253 UVC_GUID_FORMAT
"/%u flags don't match "
1254 "supported operations.\n",
1255 UVC_GUID_ARGS(info
->entity
), info
->selector
);
1261 ctrl
->data
= kmalloc(ctrl
->info
->size
* UVC_CTRL_NDATA
, GFP_KERNEL
);
1262 uvc_trace(UVC_TRACE_CONTROL
, "Added control " UVC_GUID_FORMAT
"/%u "
1263 "to device %s entity %u\n", UVC_GUID_ARGS(ctrl
->info
->entity
),
1264 ctrl
->info
->selector
, dev
->udev
->devpath
, entity
->id
);
1268 * Add an item to the UVC control information list, and instantiate a control
1269 * structure for each device that supports the control.
1271 int uvc_ctrl_add_info(struct uvc_control_info
*info
)
1273 struct uvc_control_info
*ctrl
;
1274 struct uvc_device
*dev
;
1277 /* Find matching controls by walking the devices, entities and
1280 mutex_lock(&uvc_driver
.ctrl_mutex
);
1282 /* First check if the list contains a control matching the new one.
1283 * Bail out if it does.
1285 list_for_each_entry(ctrl
, &uvc_driver
.controls
, list
) {
1286 if (memcmp(ctrl
->entity
, info
->entity
, 16))
1289 if (ctrl
->selector
== info
->selector
) {
1290 uvc_trace(UVC_TRACE_CONTROL
, "Control "
1291 UVC_GUID_FORMAT
"/%u is already defined.\n",
1292 UVC_GUID_ARGS(info
->entity
), info
->selector
);
1296 if (ctrl
->index
== info
->index
) {
1297 uvc_trace(UVC_TRACE_CONTROL
, "Control "
1298 UVC_GUID_FORMAT
"/%u would overwrite index "
1299 "%d.\n", UVC_GUID_ARGS(info
->entity
),
1300 info
->selector
, info
->index
);
1306 list_for_each_entry(dev
, &uvc_driver
.devices
, list
)
1307 uvc_ctrl_add_ctrl(dev
, info
);
1309 INIT_LIST_HEAD(&info
->mappings
);
1310 list_add_tail(&info
->list
, &uvc_driver
.controls
);
1312 mutex_unlock(&uvc_driver
.ctrl_mutex
);
1316 int uvc_ctrl_add_mapping(struct uvc_control_mapping
*mapping
)
1318 struct uvc_control_info
*info
;
1319 struct uvc_control_mapping
*map
;
1322 if (mapping
->get
== NULL
)
1323 mapping
->get
= uvc_get_le_value
;
1324 if (mapping
->set
== NULL
)
1325 mapping
->set
= uvc_set_le_value
;
1327 if (mapping
->id
& ~V4L2_CTRL_ID_MASK
) {
1328 uvc_trace(UVC_TRACE_CONTROL
, "Can't add mapping '%s' with "
1329 "invalid control id 0x%08x\n", mapping
->name
,
1334 mutex_lock(&uvc_driver
.ctrl_mutex
);
1335 list_for_each_entry(info
, &uvc_driver
.controls
, list
) {
1336 if (memcmp(info
->entity
, mapping
->entity
, 16) ||
1337 info
->selector
!= mapping
->selector
)
1340 if (info
->size
* 8 < mapping
->size
+ mapping
->offset
) {
1341 uvc_trace(UVC_TRACE_CONTROL
, "Mapping '%s' would "
1342 "overflow control " UVC_GUID_FORMAT
"/%u\n",
1343 mapping
->name
, UVC_GUID_ARGS(info
->entity
),
1349 /* Check if the list contains a mapping matching the new one.
1350 * Bail out if it does.
1352 list_for_each_entry(map
, &info
->mappings
, list
) {
1353 if (map
->id
== mapping
->id
) {
1354 uvc_trace(UVC_TRACE_CONTROL
, "Mapping '%s' is "
1355 "already defined.\n", mapping
->name
);
1361 mapping
->ctrl
= info
;
1362 list_add_tail(&mapping
->list
, &info
->mappings
);
1363 uvc_trace(UVC_TRACE_CONTROL
, "Adding mapping %s to control "
1364 UVC_GUID_FORMAT
"/%u.\n", mapping
->name
,
1365 UVC_GUID_ARGS(info
->entity
), info
->selector
);
1371 mutex_unlock(&uvc_driver
.ctrl_mutex
);
1376 * Prune an entity of its bogus controls. This currently includes processing
1377 * unit auto controls for which no corresponding manual control is available.
1378 * Such auto controls make little sense if any, and are known to crash at
1379 * least the SiGma Micro webcam.
1382 uvc_ctrl_prune_entity(struct uvc_entity
*entity
)
1384 static const struct {
1388 { 2, 11 }, /* Hue */
1389 { 6, 12 }, /* White Balance Temperature */
1390 { 7, 13 }, /* White Balance Component */
1397 if (UVC_ENTITY_TYPE(entity
) != VC_PROCESSING_UNIT
)
1400 controls
= entity
->processing
.bmControls
;
1401 size
= entity
->processing
.bControlSize
;
1403 for (i
= 0; i
< ARRAY_SIZE(blacklist
); ++i
) {
1404 if (blacklist
[i
].idx_auto
>= 8 * size
||
1405 blacklist
[i
].idx_manual
>= 8 * size
)
1408 if (!uvc_test_bit(controls
, blacklist
[i
].idx_auto
) ||
1409 uvc_test_bit(controls
, blacklist
[i
].idx_manual
))
1412 uvc_trace(UVC_TRACE_CONTROL
, "Auto control %u/%u has no "
1413 "matching manual control, removing it.\n", entity
->id
,
1414 blacklist
[i
].idx_auto
);
1416 uvc_clear_bit(controls
, blacklist
[i
].idx_auto
);
1421 * Initialize device controls.
1423 int uvc_ctrl_init_device(struct uvc_device
*dev
)
1425 struct uvc_control_info
*info
;
1426 struct uvc_control
*ctrl
;
1427 struct uvc_entity
*entity
;
1430 /* Walk the entities list and instantiate controls */
1431 list_for_each_entry(entity
, &dev
->entities
, list
) {
1432 unsigned int bControlSize
= 0, ncontrols
= 0;
1433 __u8
*bmControls
= NULL
;
1435 if (UVC_ENTITY_TYPE(entity
) == VC_EXTENSION_UNIT
) {
1436 bmControls
= entity
->extension
.bmControls
;
1437 bControlSize
= entity
->extension
.bControlSize
;
1438 } else if (UVC_ENTITY_TYPE(entity
) == VC_PROCESSING_UNIT
) {
1439 bmControls
= entity
->processing
.bmControls
;
1440 bControlSize
= entity
->processing
.bControlSize
;
1441 } else if (UVC_ENTITY_TYPE(entity
) == ITT_CAMERA
) {
1442 bmControls
= entity
->camera
.bmControls
;
1443 bControlSize
= entity
->camera
.bControlSize
;
1446 if (dev
->quirks
& UVC_QUIRK_PRUNE_CONTROLS
)
1447 uvc_ctrl_prune_entity(entity
);
1449 for (i
= 0; i
< bControlSize
; ++i
)
1450 ncontrols
+= hweight8(bmControls
[i
]);
1455 entity
->controls
= kzalloc(ncontrols
*sizeof *ctrl
, GFP_KERNEL
);
1456 if (entity
->controls
== NULL
)
1459 entity
->ncontrols
= ncontrols
;
1461 ctrl
= entity
->controls
;
1462 for (i
= 0; i
< bControlSize
* 8; ++i
) {
1463 if (uvc_test_bit(bmControls
, i
) == 0)
1466 ctrl
->entity
= entity
;
1472 /* Walk the controls info list and associate them with the device
1473 * controls, then add the device to the global device list. This has
1474 * to be done while holding the controls lock, to make sure
1475 * uvc_ctrl_add_info() will not get called in-between.
1477 mutex_lock(&uvc_driver
.ctrl_mutex
);
1478 list_for_each_entry(info
, &uvc_driver
.controls
, list
)
1479 uvc_ctrl_add_ctrl(dev
, info
);
1481 list_add_tail(&dev
->list
, &uvc_driver
.devices
);
1482 mutex_unlock(&uvc_driver
.ctrl_mutex
);
1488 * Cleanup device controls.
1490 void uvc_ctrl_cleanup_device(struct uvc_device
*dev
)
1492 struct uvc_entity
*entity
;
1495 /* Remove the device from the global devices list */
1496 mutex_lock(&uvc_driver
.ctrl_mutex
);
1497 if (dev
->list
.next
!= NULL
)
1498 list_del(&dev
->list
);
1499 mutex_unlock(&uvc_driver
.ctrl_mutex
);
1501 list_for_each_entry(entity
, &dev
->entities
, list
) {
1502 for (i
= 0; i
< entity
->ncontrols
; ++i
)
1503 kfree(entity
->controls
[i
].data
);
1505 kfree(entity
->controls
);
1509 void uvc_ctrl_init(void)
1511 struct uvc_control_info
*ctrl
= uvc_ctrls
;
1512 struct uvc_control_info
*cend
= ctrl
+ ARRAY_SIZE(uvc_ctrls
);
1513 struct uvc_control_mapping
*mapping
= uvc_ctrl_mappings
;
1514 struct uvc_control_mapping
*mend
=
1515 mapping
+ ARRAY_SIZE(uvc_ctrl_mappings
);
1517 for (; ctrl
< cend
; ++ctrl
)
1518 uvc_ctrl_add_info(ctrl
);
1520 for (; mapping
< mend
; ++mapping
)
1521 uvc_ctrl_add_mapping(mapping
);