2 * uvc_ctrl.c -- USB Video Class driver - Controls
4 * Copyright (C) 2005-2009
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/list.h>
16 #include <linux/module.h>
17 #include <linux/slab.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_DATA_CURRENT 0
28 #define UVC_CTRL_DATA_BACKUP 1
29 #define UVC_CTRL_DATA_MIN 2
30 #define UVC_CTRL_DATA_MAX 3
31 #define UVC_CTRL_DATA_RES 4
32 #define UVC_CTRL_DATA_DEF 5
33 #define UVC_CTRL_DATA_LAST 6
35 /* ------------------------------------------------------------------------
39 static struct uvc_control_info uvc_ctrls[] = {
41 .entity = UVC_GUID_UVC_PROCESSING,
42 .selector = UVC_PU_BRIGHTNESS_CONTROL,
45 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
46 | UVC_CONTROL_RESTORE,
49 .entity = UVC_GUID_UVC_PROCESSING,
50 .selector = UVC_PU_CONTRAST_CONTROL,
53 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
54 | UVC_CONTROL_RESTORE,
57 .entity = UVC_GUID_UVC_PROCESSING,
58 .selector = UVC_PU_HUE_CONTROL,
61 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
62 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
65 .entity = UVC_GUID_UVC_PROCESSING,
66 .selector = UVC_PU_SATURATION_CONTROL,
69 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
70 | UVC_CONTROL_RESTORE,
73 .entity = UVC_GUID_UVC_PROCESSING,
74 .selector = UVC_PU_SHARPNESS_CONTROL,
77 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
78 | UVC_CONTROL_RESTORE,
81 .entity = UVC_GUID_UVC_PROCESSING,
82 .selector = UVC_PU_GAMMA_CONTROL,
85 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
86 | UVC_CONTROL_RESTORE,
89 .entity = UVC_GUID_UVC_PROCESSING,
90 .selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
93 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
94 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
97 .entity = UVC_GUID_UVC_PROCESSING,
98 .selector = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
101 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
102 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
105 .entity = UVC_GUID_UVC_PROCESSING,
106 .selector = UVC_PU_BACKLIGHT_COMPENSATION_CONTROL,
109 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
110 | UVC_CONTROL_RESTORE,
113 .entity = UVC_GUID_UVC_PROCESSING,
114 .selector = UVC_PU_GAIN_CONTROL,
117 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
118 | UVC_CONTROL_RESTORE,
121 .entity = UVC_GUID_UVC_PROCESSING,
122 .selector = UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
125 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
126 | UVC_CONTROL_RESTORE,
129 .entity = UVC_GUID_UVC_PROCESSING,
130 .selector = UVC_PU_HUE_AUTO_CONTROL,
133 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
134 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
137 .entity = UVC_GUID_UVC_PROCESSING,
138 .selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
141 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
142 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
145 .entity = UVC_GUID_UVC_PROCESSING,
146 .selector = UVC_PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
149 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
150 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
153 .entity = UVC_GUID_UVC_PROCESSING,
154 .selector = UVC_PU_DIGITAL_MULTIPLIER_CONTROL,
157 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
158 | UVC_CONTROL_RESTORE,
161 .entity = UVC_GUID_UVC_PROCESSING,
162 .selector = UVC_PU_DIGITAL_MULTIPLIER_LIMIT_CONTROL,
165 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
166 | UVC_CONTROL_RESTORE,
169 .entity = UVC_GUID_UVC_PROCESSING,
170 .selector = UVC_PU_ANALOG_VIDEO_STANDARD_CONTROL,
173 .flags = UVC_CONTROL_GET_CUR,
176 .entity = UVC_GUID_UVC_PROCESSING,
177 .selector = UVC_PU_ANALOG_LOCK_STATUS_CONTROL,
180 .flags = UVC_CONTROL_GET_CUR,
183 .entity = UVC_GUID_UVC_CAMERA,
184 .selector = UVC_CT_SCANNING_MODE_CONTROL,
187 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
188 | UVC_CONTROL_RESTORE,
191 .entity = UVC_GUID_UVC_CAMERA,
192 .selector = UVC_CT_AE_MODE_CONTROL,
195 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
196 | UVC_CONTROL_GET_DEF | UVC_CONTROL_GET_RES
197 | UVC_CONTROL_RESTORE,
200 .entity = UVC_GUID_UVC_CAMERA,
201 .selector = UVC_CT_AE_PRIORITY_CONTROL,
204 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
205 | UVC_CONTROL_RESTORE,
208 .entity = UVC_GUID_UVC_CAMERA,
209 .selector = UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
212 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
213 | UVC_CONTROL_RESTORE,
216 .entity = UVC_GUID_UVC_CAMERA,
217 .selector = UVC_CT_EXPOSURE_TIME_RELATIVE_CONTROL,
220 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
221 | UVC_CONTROL_RESTORE,
224 .entity = UVC_GUID_UVC_CAMERA,
225 .selector = UVC_CT_FOCUS_ABSOLUTE_CONTROL,
228 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
229 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
232 .entity = UVC_GUID_UVC_CAMERA,
233 .selector = UVC_CT_FOCUS_RELATIVE_CONTROL,
236 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
237 | UVC_CONTROL_AUTO_UPDATE,
240 .entity = UVC_GUID_UVC_CAMERA,
241 .selector = UVC_CT_IRIS_ABSOLUTE_CONTROL,
244 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
245 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
248 .entity = UVC_GUID_UVC_CAMERA,
249 .selector = UVC_CT_IRIS_RELATIVE_CONTROL,
252 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
253 | UVC_CONTROL_AUTO_UPDATE,
256 .entity = UVC_GUID_UVC_CAMERA,
257 .selector = UVC_CT_ZOOM_ABSOLUTE_CONTROL,
260 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
261 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
264 .entity = UVC_GUID_UVC_CAMERA,
265 .selector = UVC_CT_ZOOM_RELATIVE_CONTROL,
268 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
269 | UVC_CONTROL_AUTO_UPDATE,
272 .entity = UVC_GUID_UVC_CAMERA,
273 .selector = UVC_CT_PANTILT_ABSOLUTE_CONTROL,
276 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
277 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
280 .entity = UVC_GUID_UVC_CAMERA,
281 .selector = UVC_CT_PANTILT_RELATIVE_CONTROL,
284 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
285 | UVC_CONTROL_AUTO_UPDATE,
288 .entity = UVC_GUID_UVC_CAMERA,
289 .selector = UVC_CT_ROLL_ABSOLUTE_CONTROL,
292 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
293 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
296 .entity = UVC_GUID_UVC_CAMERA,
297 .selector = UVC_CT_ROLL_RELATIVE_CONTROL,
300 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE
301 | UVC_CONTROL_AUTO_UPDATE,
304 .entity = UVC_GUID_UVC_CAMERA,
305 .selector = UVC_CT_FOCUS_AUTO_CONTROL,
308 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
309 | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE,
312 .entity = UVC_GUID_UVC_CAMERA,
313 .selector = UVC_CT_PRIVACY_CONTROL,
316 .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR
317 | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE,
321 static struct uvc_menu_info power_line_frequency_controls[] = {
327 static struct uvc_menu_info exposure_auto_controls[] = {
329 { 1, "Manual Mode" },
330 { 4, "Shutter Priority Mode" },
331 { 8, "Aperture Priority Mode" },
334 static __s32 uvc_ctrl_get_zoom(struct uvc_control_mapping *mapping,
335 __u8 query, const __u8 *data)
337 __s8 zoom = (__s8)data[0];
341 return (zoom == 0) ? 0 : (zoom > 0 ? data[2] : -data[2]);
352 static void uvc_ctrl_set_zoom(struct uvc_control_mapping *mapping,
353 __s32 value, __u8 *data)
355 data[0] = value == 0 ? 0 : (value > 0) ? 1 : 0xff;
356 data[2] = min((int)abs(value), 0xff);
359 static struct uvc_control_mapping uvc_ctrl_mappings[] = {
361 .id = V4L2_CID_BRIGHTNESS,
362 .name = "Brightness",
363 .entity = UVC_GUID_UVC_PROCESSING,
364 .selector = UVC_PU_BRIGHTNESS_CONTROL,
367 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
368 .data_type = UVC_CTRL_DATA_TYPE_SIGNED,
371 .id = V4L2_CID_CONTRAST,
373 .entity = UVC_GUID_UVC_PROCESSING,
374 .selector = UVC_PU_CONTRAST_CONTROL,
377 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
378 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
383 .entity = UVC_GUID_UVC_PROCESSING,
384 .selector = UVC_PU_HUE_CONTROL,
387 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
388 .data_type = UVC_CTRL_DATA_TYPE_SIGNED,
391 .id = V4L2_CID_SATURATION,
392 .name = "Saturation",
393 .entity = UVC_GUID_UVC_PROCESSING,
394 .selector = UVC_PU_SATURATION_CONTROL,
397 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
398 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
401 .id = V4L2_CID_SHARPNESS,
403 .entity = UVC_GUID_UVC_PROCESSING,
404 .selector = UVC_PU_SHARPNESS_CONTROL,
407 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
408 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
411 .id = V4L2_CID_GAMMA,
413 .entity = UVC_GUID_UVC_PROCESSING,
414 .selector = UVC_PU_GAMMA_CONTROL,
417 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
418 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
421 .id = V4L2_CID_BACKLIGHT_COMPENSATION,
422 .name = "Backlight Compensation",
423 .entity = UVC_GUID_UVC_PROCESSING,
424 .selector = UVC_PU_BACKLIGHT_COMPENSATION_CONTROL,
427 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
428 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
433 .entity = UVC_GUID_UVC_PROCESSING,
434 .selector = UVC_PU_GAIN_CONTROL,
437 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
438 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
441 .id = V4L2_CID_POWER_LINE_FREQUENCY,
442 .name = "Power Line Frequency",
443 .entity = UVC_GUID_UVC_PROCESSING,
444 .selector = UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
447 .v4l2_type = V4L2_CTRL_TYPE_MENU,
448 .data_type = UVC_CTRL_DATA_TYPE_ENUM,
449 .menu_info = power_line_frequency_controls,
450 .menu_count = ARRAY_SIZE(power_line_frequency_controls),
453 .id = V4L2_CID_HUE_AUTO,
455 .entity = UVC_GUID_UVC_PROCESSING,
456 .selector = UVC_PU_HUE_AUTO_CONTROL,
459 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
460 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
463 .id = V4L2_CID_EXPOSURE_AUTO,
464 .name = "Exposure, Auto",
465 .entity = UVC_GUID_UVC_CAMERA,
466 .selector = UVC_CT_AE_MODE_CONTROL,
469 .v4l2_type = V4L2_CTRL_TYPE_MENU,
470 .data_type = UVC_CTRL_DATA_TYPE_BITMASK,
471 .menu_info = exposure_auto_controls,
472 .menu_count = ARRAY_SIZE(exposure_auto_controls),
475 .id = V4L2_CID_EXPOSURE_AUTO_PRIORITY,
476 .name = "Exposure, Auto Priority",
477 .entity = UVC_GUID_UVC_CAMERA,
478 .selector = UVC_CT_AE_PRIORITY_CONTROL,
481 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
482 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
485 .id = V4L2_CID_EXPOSURE_ABSOLUTE,
486 .name = "Exposure (Absolute)",
487 .entity = UVC_GUID_UVC_CAMERA,
488 .selector = UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
491 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
492 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
495 .id = V4L2_CID_AUTO_WHITE_BALANCE,
496 .name = "White Balance Temperature, Auto",
497 .entity = UVC_GUID_UVC_PROCESSING,
498 .selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
501 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
502 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
505 .id = V4L2_CID_WHITE_BALANCE_TEMPERATURE,
506 .name = "White Balance Temperature",
507 .entity = UVC_GUID_UVC_PROCESSING,
508 .selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
511 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
512 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
515 .id = V4L2_CID_AUTO_WHITE_BALANCE,
516 .name = "White Balance Component, Auto",
517 .entity = UVC_GUID_UVC_PROCESSING,
518 .selector = UVC_PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
521 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
522 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
525 .id = V4L2_CID_BLUE_BALANCE,
526 .name = "White Balance Blue Component",
527 .entity = UVC_GUID_UVC_PROCESSING,
528 .selector = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
531 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
532 .data_type = UVC_CTRL_DATA_TYPE_SIGNED,
535 .id = V4L2_CID_RED_BALANCE,
536 .name = "White Balance Red Component",
537 .entity = UVC_GUID_UVC_PROCESSING,
538 .selector = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
541 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
542 .data_type = UVC_CTRL_DATA_TYPE_SIGNED,
545 .id = V4L2_CID_FOCUS_ABSOLUTE,
546 .name = "Focus (absolute)",
547 .entity = UVC_GUID_UVC_CAMERA,
548 .selector = UVC_CT_FOCUS_ABSOLUTE_CONTROL,
551 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
552 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
555 .id = V4L2_CID_FOCUS_AUTO,
556 .name = "Focus, Auto",
557 .entity = UVC_GUID_UVC_CAMERA,
558 .selector = UVC_CT_FOCUS_AUTO_CONTROL,
561 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
562 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
565 .id = V4L2_CID_ZOOM_ABSOLUTE,
566 .name = "Zoom, Absolute",
567 .entity = UVC_GUID_UVC_CAMERA,
568 .selector = UVC_CT_ZOOM_ABSOLUTE_CONTROL,
571 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
572 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
575 .id = V4L2_CID_ZOOM_CONTINUOUS,
576 .name = "Zoom, Continuous",
577 .entity = UVC_GUID_UVC_CAMERA,
578 .selector = UVC_CT_ZOOM_RELATIVE_CONTROL,
581 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
582 .data_type = UVC_CTRL_DATA_TYPE_SIGNED,
583 .get = uvc_ctrl_get_zoom,
584 .set = uvc_ctrl_set_zoom,
587 .id = V4L2_CID_PRIVACY,
589 .entity = UVC_GUID_UVC_CAMERA,
590 .selector = UVC_CT_PRIVACY_CONTROL,
593 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
594 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
598 /* ------------------------------------------------------------------------
602 static inline __u8 *uvc_ctrl_data(struct uvc_control *ctrl, int id)
604 return ctrl->data + id * ctrl->info->size;
607 static inline int uvc_test_bit(const __u8 *data, int bit)
609 return (data[bit >> 3] >> (bit & 7)) & 1;
612 static inline void uvc_clear_bit(__u8 *data, int bit)
614 data[bit >> 3] &= ~(1 << (bit & 7));
617 /* Extract the bit string specified by mapping->offset and mapping->size
618 * from the little-endian data stored at 'data' and return the result as
619 * a signed 32bit integer. Sign extension will be performed if the mapping
620 * references a signed data type.
622 static __s32 uvc_get_le_value(struct uvc_control_mapping *mapping,
623 __u8 query, const __u8 *data)
625 int bits = mapping->size;
626 int offset = mapping->offset;
632 mask = ((1LL << bits) - 1) << offset;
634 for (; bits > 0; data++) {
635 __u8 byte = *data & mask;
636 value |= offset > 0 ? (byte >> offset) : (byte << (-offset));
637 bits -= 8 - (offset > 0 ? offset : 0);
639 mask = (1 << bits) - 1;
642 /* Sign-extend the value if needed. */
643 if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED)
644 value |= -(value & (1 << (mapping->size - 1)));
649 /* Set the bit string specified by mapping->offset and mapping->size
650 * in the little-endian data stored at 'data' to the value 'value'.
652 static void uvc_set_le_value(struct uvc_control_mapping *mapping,
653 __s32 value, __u8 *data)
655 int bits = mapping->size;
656 int offset = mapping->offset;
662 for (; bits > 0; data++) {
663 mask = ((1LL << bits) - 1) << offset;
664 *data = (*data & ~mask) | ((value << offset) & mask);
665 value >>= offset ? offset : 8;
671 /* ------------------------------------------------------------------------
672 * Terminal and unit management
675 static const __u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
676 static const __u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA;
677 static const __u8 uvc_media_transport_input_guid[16] =
678 UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
680 static int uvc_entity_match_guid(struct uvc_entity *entity, __u8 guid[16])
682 switch (UVC_ENTITY_TYPE(entity)) {
684 return memcmp(uvc_camera_guid, guid, 16) == 0;
686 case UVC_ITT_MEDIA_TRANSPORT_INPUT:
687 return memcmp(uvc_media_transport_input_guid, guid, 16) == 0;
689 case UVC_VC_PROCESSING_UNIT:
690 return memcmp(uvc_processing_guid, guid, 16) == 0;
692 case UVC_VC_EXTENSION_UNIT:
693 return memcmp(entity->extension.guidExtensionCode,
701 /* ------------------------------------------------------------------------
705 static void __uvc_find_control(struct uvc_entity *entity, __u32 v4l2_id,
706 struct uvc_control_mapping **mapping, struct uvc_control **control,
709 struct uvc_control *ctrl;
710 struct uvc_control_mapping *map;
716 for (i = 0; i < entity->ncontrols; ++i) {
717 ctrl = &entity->controls[i];
718 if (ctrl->info == NULL)
721 list_for_each_entry(map, &ctrl->info->mappings, list) {
722 if ((map->id == v4l2_id) && !next) {
728 if ((*mapping == NULL || (*mapping)->id > map->id) &&
729 (map->id > v4l2_id) && next) {
737 struct uvc_control *uvc_find_control(struct uvc_video_chain *chain,
738 __u32 v4l2_id, struct uvc_control_mapping **mapping)
740 struct uvc_control *ctrl = NULL;
741 struct uvc_entity *entity;
742 int next = v4l2_id & V4L2_CTRL_FLAG_NEXT_CTRL;
746 /* Mask the query flags. */
747 v4l2_id &= V4L2_CTRL_ID_MASK;
749 /* Find the control. */
750 list_for_each_entry(entity, &chain->entities, chain) {
751 __uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
756 if (ctrl == NULL && !next)
757 uvc_trace(UVC_TRACE_CONTROL, "Control 0x%08x not found.\n",
763 static int uvc_ctrl_populate_cache(struct uvc_video_chain *chain,
764 struct uvc_control *ctrl)
768 if (ctrl->info->flags & UVC_CONTROL_GET_DEF) {
769 ret = uvc_query_ctrl(chain->dev, UVC_GET_DEF, ctrl->entity->id,
770 chain->dev->intfnum, ctrl->info->selector,
771 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_DEF),
777 if (ctrl->info->flags & UVC_CONTROL_GET_MIN) {
778 ret = uvc_query_ctrl(chain->dev, UVC_GET_MIN, ctrl->entity->id,
779 chain->dev->intfnum, ctrl->info->selector,
780 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN),
785 if (ctrl->info->flags & UVC_CONTROL_GET_MAX) {
786 ret = uvc_query_ctrl(chain->dev, UVC_GET_MAX, ctrl->entity->id,
787 chain->dev->intfnum, ctrl->info->selector,
788 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX),
793 if (ctrl->info->flags & UVC_CONTROL_GET_RES) {
794 ret = uvc_query_ctrl(chain->dev, UVC_GET_RES, ctrl->entity->id,
795 chain->dev->intfnum, ctrl->info->selector,
796 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES),
806 int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
807 struct v4l2_queryctrl *v4l2_ctrl)
809 struct uvc_control *ctrl;
810 struct uvc_control_mapping *mapping;
811 struct uvc_menu_info *menu;
815 ctrl = uvc_find_control(chain, v4l2_ctrl->id, &mapping);
819 memset(v4l2_ctrl, 0, sizeof *v4l2_ctrl);
820 v4l2_ctrl->id = mapping->id;
821 v4l2_ctrl->type = mapping->v4l2_type;
822 strlcpy(v4l2_ctrl->name, mapping->name, sizeof v4l2_ctrl->name);
823 v4l2_ctrl->flags = 0;
825 if (!(ctrl->info->flags & UVC_CONTROL_SET_CUR))
826 v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
829 ret = uvc_ctrl_populate_cache(chain, ctrl);
834 if (ctrl->info->flags & UVC_CONTROL_GET_DEF) {
835 v4l2_ctrl->default_value = mapping->get(mapping, UVC_GET_DEF,
836 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_DEF));
839 switch (mapping->v4l2_type) {
840 case V4L2_CTRL_TYPE_MENU:
841 v4l2_ctrl->minimum = 0;
842 v4l2_ctrl->maximum = mapping->menu_count - 1;
845 menu = mapping->menu_info;
846 for (i = 0; i < mapping->menu_count; ++i, ++menu) {
847 if (menu->value == v4l2_ctrl->default_value) {
848 v4l2_ctrl->default_value = i;
855 case V4L2_CTRL_TYPE_BOOLEAN:
856 v4l2_ctrl->minimum = 0;
857 v4l2_ctrl->maximum = 1;
861 case V4L2_CTRL_TYPE_BUTTON:
862 v4l2_ctrl->minimum = 0;
863 v4l2_ctrl->maximum = 0;
871 if (ctrl->info->flags & UVC_CONTROL_GET_MIN)
872 v4l2_ctrl->minimum = mapping->get(mapping, UVC_GET_MIN,
873 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
875 if (ctrl->info->flags & UVC_CONTROL_GET_MAX)
876 v4l2_ctrl->maximum = mapping->get(mapping, UVC_GET_MAX,
877 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
879 if (ctrl->info->flags & UVC_CONTROL_GET_RES)
880 v4l2_ctrl->step = mapping->get(mapping, UVC_GET_RES,
881 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
887 /* --------------------------------------------------------------------------
888 * Control transactions
890 * To make extended set operations as atomic as the hardware allows, controls
891 * are handled using begin/commit/rollback operations.
893 * At the beginning of a set request, uvc_ctrl_begin should be called to
894 * initialize the request. This function acquires the control lock.
896 * When setting a control, the new value is stored in the control data field
897 * at position UVC_CTRL_DATA_CURRENT. The control is then marked as dirty for
898 * later processing. If the UVC and V4L2 control sizes differ, the current
899 * value is loaded from the hardware before storing the new value in the data
902 * After processing all controls in the transaction, uvc_ctrl_commit or
903 * uvc_ctrl_rollback must be called to apply the pending changes to the
904 * hardware or revert them. When applying changes, all controls marked as
905 * dirty will be modified in the UVC device, and the dirty flag will be
906 * cleared. When reverting controls, the control data field
907 * UVC_CTRL_DATA_CURRENT is reverted to its previous value
908 * (UVC_CTRL_DATA_BACKUP) for all dirty controls. Both functions release the
911 int uvc_ctrl_begin(struct uvc_video_chain *chain)
913 return mutex_lock_interruptible(&chain->ctrl_mutex) ? -ERESTARTSYS : 0;
916 static int uvc_ctrl_commit_entity(struct uvc_device *dev,
917 struct uvc_entity *entity, int rollback)
919 struct uvc_control *ctrl;
926 for (i = 0; i < entity->ncontrols; ++i) {
927 ctrl = &entity->controls[i];
928 if (ctrl->info == NULL)
931 /* Reset the loaded flag for auto-update controls that were
932 * marked as loaded in uvc_ctrl_get/uvc_ctrl_set to prevent
933 * uvc_ctrl_get from using the cached value.
935 if (ctrl->info->flags & UVC_CONTROL_AUTO_UPDATE)
942 ret = uvc_query_ctrl(dev, UVC_SET_CUR, ctrl->entity->id,
943 dev->intfnum, ctrl->info->selector,
944 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
949 if (rollback || ret < 0)
950 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
951 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
963 int __uvc_ctrl_commit(struct uvc_video_chain *chain, int rollback)
965 struct uvc_entity *entity;
968 /* Find the control. */
969 list_for_each_entry(entity, &chain->entities, chain) {
970 ret = uvc_ctrl_commit_entity(chain->dev, entity, rollback);
976 mutex_unlock(&chain->ctrl_mutex);
980 int uvc_ctrl_get(struct uvc_video_chain *chain,
981 struct v4l2_ext_control *xctrl)
983 struct uvc_control *ctrl;
984 struct uvc_control_mapping *mapping;
985 struct uvc_menu_info *menu;
989 ctrl = uvc_find_control(chain, xctrl->id, &mapping);
990 if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0)
994 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, ctrl->entity->id,
995 chain->dev->intfnum, ctrl->info->selector,
996 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1004 xctrl->value = mapping->get(mapping, UVC_GET_CUR,
1005 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
1007 if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
1008 menu = mapping->menu_info;
1009 for (i = 0; i < mapping->menu_count; ++i, ++menu) {
1010 if (menu->value == xctrl->value) {
1020 int uvc_ctrl_set(struct uvc_video_chain *chain,
1021 struct v4l2_ext_control *xctrl)
1023 struct uvc_control *ctrl;
1024 struct uvc_control_mapping *mapping;
1031 ctrl = uvc_find_control(chain, xctrl->id, &mapping);
1032 if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_SET_CUR) == 0)
1035 /* Clamp out of range values. */
1036 switch (mapping->v4l2_type) {
1037 case V4L2_CTRL_TYPE_INTEGER:
1038 if (!ctrl->cached) {
1039 ret = uvc_ctrl_populate_cache(chain, ctrl);
1044 min = mapping->get(mapping, UVC_GET_MIN,
1045 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
1046 max = mapping->get(mapping, UVC_GET_MAX,
1047 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
1048 step = mapping->get(mapping, UVC_GET_RES,
1049 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
1051 xctrl->value = min + (xctrl->value - min + step/2) / step * step;
1052 xctrl->value = clamp(xctrl->value, min, max);
1053 value = xctrl->value;
1056 case V4L2_CTRL_TYPE_BOOLEAN:
1057 xctrl->value = clamp(xctrl->value, 0, 1);
1058 value = xctrl->value;
1061 case V4L2_CTRL_TYPE_MENU:
1062 if (xctrl->value < 0 || xctrl->value >= mapping->menu_count)
1064 value = mapping->menu_info[xctrl->value].value;
1068 value = xctrl->value;
1072 /* If the mapping doesn't span the whole UVC control, the current value
1073 * needs to be loaded from the device to perform the read-modify-write
1076 if (!ctrl->loaded && (ctrl->info->size * 8) != mapping->size) {
1077 if ((ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0) {
1078 memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1079 0, ctrl->info->size);
1081 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
1082 ctrl->entity->id, chain->dev->intfnum,
1083 ctrl->info->selector,
1084 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1093 /* Backup the current value in case we need to rollback later. */
1095 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1096 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1100 mapping->set(mapping, value,
1101 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
1108 /* --------------------------------------------------------------------------
1112 int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
1113 struct uvc_xu_control *xctrl, int set)
1115 struct uvc_entity *entity;
1116 struct uvc_control *ctrl = NULL;
1117 unsigned int i, found = 0;
1121 /* Find the extension unit. */
1122 list_for_each_entry(entity, &chain->entities, chain) {
1123 if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT &&
1124 entity->id == xctrl->unit)
1128 if (entity->id != xctrl->unit) {
1129 uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n",
1134 /* Find the control. */
1135 for (i = 0; i < entity->ncontrols; ++i) {
1136 ctrl = &entity->controls[i];
1137 if (ctrl->info == NULL)
1140 if (ctrl->info->selector == xctrl->selector) {
1147 uvc_trace(UVC_TRACE_CONTROL, "Control %pUl/%u not found.\n",
1148 entity->extension.guidExtensionCode, xctrl->selector);
1152 /* Validate control data size. */
1153 if (ctrl->info->size != xctrl->size)
1156 if ((set && !(ctrl->info->flags & UVC_CONTROL_SET_CUR)) ||
1157 (!set && !(ctrl->info->flags & UVC_CONTROL_GET_CUR)))
1160 if (mutex_lock_interruptible(&chain->ctrl_mutex))
1161 return -ERESTARTSYS;
1163 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1164 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1166 data = uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT);
1168 if (set && copy_from_user(data, xctrl->data, xctrl->size)) {
1173 ret = uvc_query_ctrl(chain->dev, set ? UVC_SET_CUR : UVC_GET_CUR,
1174 xctrl->unit, chain->dev->intfnum, xctrl->selector,
1179 if (!set && copy_to_user(xctrl->data, data, xctrl->size)) {
1186 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1187 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1190 mutex_unlock(&chain->ctrl_mutex);
1194 /* --------------------------------------------------------------------------
1199 * Restore control values after resume, skipping controls that haven't been
1203 * - Don't restore modified controls that are back to their default value.
1204 * - Handle restore order (Auto-Exposure Mode should be restored before
1207 int uvc_ctrl_resume_device(struct uvc_device *dev)
1209 struct uvc_control *ctrl;
1210 struct uvc_entity *entity;
1214 /* Walk the entities list and restore controls when possible. */
1215 list_for_each_entry(entity, &dev->entities, list) {
1217 for (i = 0; i < entity->ncontrols; ++i) {
1218 ctrl = &entity->controls[i];
1220 if (ctrl->info == NULL || !ctrl->modified ||
1221 (ctrl->info->flags & UVC_CONTROL_RESTORE) == 0)
1224 printk(KERN_INFO "restoring control %pUl/%u/%u\n",
1225 ctrl->info->entity, ctrl->info->index,
1226 ctrl->info->selector);
1230 ret = uvc_ctrl_commit_entity(dev, entity, 0);
1238 /* --------------------------------------------------------------------------
1239 * Control and mapping handling
1242 static void uvc_ctrl_add_ctrl(struct uvc_device *dev,
1243 struct uvc_control_info *info)
1245 struct uvc_entity *entity;
1246 struct uvc_control *ctrl = NULL;
1250 list_for_each_entry(entity, &dev->entities, list) {
1251 if (!uvc_entity_match_guid(entity, info->entity))
1254 for (i = 0; i < entity->ncontrols; ++i) {
1255 ctrl = &entity->controls[i];
1256 if (ctrl->index == info->index) {
1269 if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT) {
1270 /* Check if the device control information and length match
1271 * the user supplied information.
1277 ret = uvc_query_ctrl(dev, UVC_GET_LEN, ctrl->entity->id,
1278 dev->intfnum, info->selector, (__u8 *)&size, 2);
1280 uvc_trace(UVC_TRACE_CONTROL,
1281 "GET_LEN failed on control %pUl/%u (%d).\n",
1282 info->entity, info->selector, ret);
1286 if (info->size != le16_to_cpu(size)) {
1287 uvc_trace(UVC_TRACE_CONTROL, "Control %pUl/%u size "
1288 "doesn't match user supplied value.\n",
1289 info->entity, info->selector);
1293 ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id,
1294 dev->intfnum, info->selector, &inf, 1);
1296 uvc_trace(UVC_TRACE_CONTROL,
1297 "GET_INFO failed on control %pUl/%u (%d).\n",
1298 info->entity, info->selector, ret);
1302 flags = info->flags;
1303 if (((flags & UVC_CONTROL_GET_CUR) && !(inf & (1 << 0))) ||
1304 ((flags & UVC_CONTROL_SET_CUR) && !(inf & (1 << 1)))) {
1305 uvc_trace(UVC_TRACE_CONTROL, "Control %pUl/%u flags "
1306 "don't match supported operations.\n",
1307 info->entity, info->selector);
1313 ctrl->data = kmalloc(ctrl->info->size * UVC_CTRL_DATA_LAST, GFP_KERNEL);
1314 uvc_trace(UVC_TRACE_CONTROL, "Added control %pUl/%u to device %s "
1315 "entity %u\n", ctrl->info->entity, ctrl->info->selector,
1316 dev->udev->devpath, entity->id);
1320 * Add an item to the UVC control information list, and instantiate a control
1321 * structure for each device that supports the control.
1323 int uvc_ctrl_add_info(struct uvc_control_info *info)
1325 struct uvc_control_info *ctrl;
1326 struct uvc_device *dev;
1329 /* Find matching controls by walking the devices, entities and
1332 mutex_lock(&uvc_driver.ctrl_mutex);
1334 /* First check if the list contains a control matching the new one.
1335 * Bail out if it does.
1337 list_for_each_entry(ctrl, &uvc_driver.controls, list) {
1338 if (memcmp(ctrl->entity, info->entity, 16))
1341 if (ctrl->selector == info->selector) {
1342 uvc_trace(UVC_TRACE_CONTROL,
1343 "Control %pUl/%u is already defined.\n",
1344 info->entity, info->selector);
1348 if (ctrl->index == info->index) {
1349 uvc_trace(UVC_TRACE_CONTROL,
1350 "Control %pUl/%u would overwrite index %d.\n",
1351 info->entity, info->selector, info->index);
1357 list_for_each_entry(dev, &uvc_driver.devices, list)
1358 uvc_ctrl_add_ctrl(dev, info);
1360 INIT_LIST_HEAD(&info->mappings);
1361 list_add_tail(&info->list, &uvc_driver.controls);
1363 mutex_unlock(&uvc_driver.ctrl_mutex);
1367 int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping)
1369 struct uvc_control_info *info;
1370 struct uvc_control_mapping *map;
1373 if (mapping->get == NULL)
1374 mapping->get = uvc_get_le_value;
1375 if (mapping->set == NULL)
1376 mapping->set = uvc_set_le_value;
1378 if (mapping->id & ~V4L2_CTRL_ID_MASK) {
1379 uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s' with "
1380 "invalid control id 0x%08x\n", mapping->name,
1385 mutex_lock(&uvc_driver.ctrl_mutex);
1386 list_for_each_entry(info, &uvc_driver.controls, list) {
1387 if (memcmp(info->entity, mapping->entity, 16) ||
1388 info->selector != mapping->selector)
1391 if (info->size * 8 < mapping->size + mapping->offset) {
1392 uvc_trace(UVC_TRACE_CONTROL,
1393 "Mapping '%s' would overflow control %pUl/%u\n",
1394 mapping->name, info->entity, info->selector);
1399 /* Check if the list contains a mapping matching the new one.
1400 * Bail out if it does.
1402 list_for_each_entry(map, &info->mappings, list) {
1403 if (map->id == mapping->id) {
1404 uvc_trace(UVC_TRACE_CONTROL, "Mapping '%s' is "
1405 "already defined.\n", mapping->name);
1411 mapping->ctrl = info;
1412 list_add_tail(&mapping->list, &info->mappings);
1413 uvc_trace(UVC_TRACE_CONTROL,
1414 "Adding mapping %s to control %pUl/%u.\n",
1415 mapping->name, info->entity, info->selector);
1421 mutex_unlock(&uvc_driver.ctrl_mutex);
1426 * Prune an entity of its bogus controls using a blacklist. Bogus controls
1427 * are currently the ones that crash the camera or unconditionally return an
1428 * error when queried.
1431 uvc_ctrl_prune_entity(struct uvc_device *dev, struct uvc_entity *entity)
1433 static const struct {
1434 struct usb_device_id id;
1437 { { USB_DEVICE(0x13d3, 0x509b) }, 9 }, /* Gain */
1438 { { USB_DEVICE(0x1c4f, 0x3000) }, 6 }, /* WB Temperature */
1439 { { USB_DEVICE(0x5986, 0x0241) }, 2 }, /* Hue */
1446 if (UVC_ENTITY_TYPE(entity) != UVC_VC_PROCESSING_UNIT)
1449 controls = entity->processing.bmControls;
1450 size = entity->processing.bControlSize;
1452 for (i = 0; i < ARRAY_SIZE(blacklist); ++i) {
1453 if (!usb_match_one_id(dev->intf, &blacklist[i].id))
1456 if (blacklist[i].index >= 8 * size ||
1457 !uvc_test_bit(controls, blacklist[i].index))
1460 uvc_trace(UVC_TRACE_CONTROL, "%u/%u control is black listed, "
1461 "removing it.\n", entity->id, blacklist[i].index);
1463 uvc_clear_bit(controls, blacklist[i].index);
1468 * Initialize device controls.
1470 int uvc_ctrl_init_device(struct uvc_device *dev)
1472 struct uvc_control_info *info;
1473 struct uvc_control *ctrl;
1474 struct uvc_entity *entity;
1477 /* Walk the entities list and instantiate controls */
1478 list_for_each_entry(entity, &dev->entities, list) {
1479 unsigned int bControlSize = 0, ncontrols = 0;
1480 __u8 *bmControls = NULL;
1482 if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT) {
1483 bmControls = entity->extension.bmControls;
1484 bControlSize = entity->extension.bControlSize;
1485 } else if (UVC_ENTITY_TYPE(entity) == UVC_VC_PROCESSING_UNIT) {
1486 bmControls = entity->processing.bmControls;
1487 bControlSize = entity->processing.bControlSize;
1488 } else if (UVC_ENTITY_TYPE(entity) == UVC_ITT_CAMERA) {
1489 bmControls = entity->camera.bmControls;
1490 bControlSize = entity->camera.bControlSize;
1493 uvc_ctrl_prune_entity(dev, entity);
1495 for (i = 0; i < bControlSize; ++i)
1496 ncontrols += hweight8(bmControls[i]);
1501 entity->controls = kzalloc(ncontrols*sizeof *ctrl, GFP_KERNEL);
1502 if (entity->controls == NULL)
1505 entity->ncontrols = ncontrols;
1507 ctrl = entity->controls;
1508 for (i = 0; i < bControlSize * 8; ++i) {
1509 if (uvc_test_bit(bmControls, i) == 0)
1512 ctrl->entity = entity;
1518 /* Walk the controls info list and associate them with the device
1519 * controls, then add the device to the global device list. This has
1520 * to be done while holding the controls lock, to make sure
1521 * uvc_ctrl_add_info() will not get called in-between.
1523 mutex_lock(&uvc_driver.ctrl_mutex);
1524 list_for_each_entry(info, &uvc_driver.controls, list)
1525 uvc_ctrl_add_ctrl(dev, info);
1527 list_add_tail(&dev->list, &uvc_driver.devices);
1528 mutex_unlock(&uvc_driver.ctrl_mutex);
1534 * Cleanup device controls.
1536 void uvc_ctrl_cleanup_device(struct uvc_device *dev)
1538 struct uvc_entity *entity;
1541 /* Remove the device from the global devices list */
1542 mutex_lock(&uvc_driver.ctrl_mutex);
1543 if (dev->list.next != NULL)
1544 list_del(&dev->list);
1545 mutex_unlock(&uvc_driver.ctrl_mutex);
1547 list_for_each_entry(entity, &dev->entities, list) {
1548 for (i = 0; i < entity->ncontrols; ++i)
1549 kfree(entity->controls[i].data);
1551 kfree(entity->controls);
1555 void uvc_ctrl_init(void)
1557 struct uvc_control_info *ctrl = uvc_ctrls;
1558 struct uvc_control_info *cend = ctrl + ARRAY_SIZE(uvc_ctrls);
1559 struct uvc_control_mapping *mapping = uvc_ctrl_mappings;
1560 struct uvc_control_mapping *mend =
1561 mapping + ARRAY_SIZE(uvc_ctrl_mappings);
1563 for (; ctrl < cend; ++ctrl)
1564 uvc_ctrl_add_info(ctrl);
1566 for (; mapping < mend; ++mapping)
1567 uvc_ctrl_add_mapping(mapping);