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[pohmelfs.git] / drivers / media / video / uvc / uvc_ctrl.c
blob0efd3b10b3537f94662bfb8be82f87ad5f3aee18
1 /*
2 * uvc_ctrl.c -- USB Video Class driver - Controls
3 *
4 * Copyright (C) 2005-2010
5 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
6 *
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.
11 *
12 */
13
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 <linux/atomic.h>
24
25 #include "uvcvideo.h"
26
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
34
35 /* ------------------------------------------------------------------------
36 * Controls
37 */
38
39 static struct uvc_control_info uvc_ctrls[] = {
40 {
41 .entity = UVC_GUID_UVC_PROCESSING,
42 .selector = UVC_PU_BRIGHTNESS_CONTROL,
43 .index = 0,
44 .size = 2,
45 .flags = UVC_CTRL_FLAG_SET_CUR
46 | UVC_CTRL_FLAG_GET_RANGE
47 | UVC_CTRL_FLAG_RESTORE,
48 },
49 {
50 .entity = UVC_GUID_UVC_PROCESSING,
51 .selector = UVC_PU_CONTRAST_CONTROL,
52 .index = 1,
53 .size = 2,
54 .flags = UVC_CTRL_FLAG_SET_CUR
55 | UVC_CTRL_FLAG_GET_RANGE
56 | UVC_CTRL_FLAG_RESTORE,
57 },
58 {
59 .entity = UVC_GUID_UVC_PROCESSING,
60 .selector = UVC_PU_HUE_CONTROL,
61 .index = 2,
62 .size = 2,
63 .flags = UVC_CTRL_FLAG_SET_CUR
64 | UVC_CTRL_FLAG_GET_RANGE
65 | UVC_CTRL_FLAG_RESTORE
66 | UVC_CTRL_FLAG_AUTO_UPDATE,
67 },
68 {
69 .entity = UVC_GUID_UVC_PROCESSING,
70 .selector = UVC_PU_SATURATION_CONTROL,
71 .index = 3,
72 .size = 2,
73 .flags = UVC_CTRL_FLAG_SET_CUR
74 | UVC_CTRL_FLAG_GET_RANGE
75 | UVC_CTRL_FLAG_RESTORE,
76 },
77 {
78 .entity = UVC_GUID_UVC_PROCESSING,
79 .selector = UVC_PU_SHARPNESS_CONTROL,
80 .index = 4,
81 .size = 2,
82 .flags = UVC_CTRL_FLAG_SET_CUR
83 | UVC_CTRL_FLAG_GET_RANGE
84 | UVC_CTRL_FLAG_RESTORE,
85 },
86 {
87 .entity = UVC_GUID_UVC_PROCESSING,
88 .selector = UVC_PU_GAMMA_CONTROL,
89 .index = 5,
90 .size = 2,
91 .flags = UVC_CTRL_FLAG_SET_CUR
92 | UVC_CTRL_FLAG_GET_RANGE
93 | UVC_CTRL_FLAG_RESTORE,
94 },
95 {
96 .entity = UVC_GUID_UVC_PROCESSING,
97 .selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
98 .index = 6,
99 .size = 2,
100 .flags = UVC_CTRL_FLAG_SET_CUR
101 | UVC_CTRL_FLAG_GET_RANGE
102 | UVC_CTRL_FLAG_RESTORE
103 | UVC_CTRL_FLAG_AUTO_UPDATE,
104 },
105 {
106 .entity = UVC_GUID_UVC_PROCESSING,
107 .selector = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
108 .index = 7,
109 .size = 4,
110 .flags = UVC_CTRL_FLAG_SET_CUR
111 | UVC_CTRL_FLAG_GET_RANGE
112 | UVC_CTRL_FLAG_RESTORE
113 | UVC_CTRL_FLAG_AUTO_UPDATE,
114 },
115 {
116 .entity = UVC_GUID_UVC_PROCESSING,
117 .selector = UVC_PU_BACKLIGHT_COMPENSATION_CONTROL,
118 .index = 8,
119 .size = 2,
120 .flags = UVC_CTRL_FLAG_SET_CUR
121 | UVC_CTRL_FLAG_GET_RANGE
122 | UVC_CTRL_FLAG_RESTORE,
123 },
124 {
125 .entity = UVC_GUID_UVC_PROCESSING,
126 .selector = UVC_PU_GAIN_CONTROL,
127 .index = 9,
128 .size = 2,
129 .flags = UVC_CTRL_FLAG_SET_CUR
130 | UVC_CTRL_FLAG_GET_RANGE
131 | UVC_CTRL_FLAG_RESTORE,
132 },
133 {
134 .entity = UVC_GUID_UVC_PROCESSING,
135 .selector = UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
136 .index = 10,
137 .size = 1,
138 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
139 | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE,
140 },
141 {
142 .entity = UVC_GUID_UVC_PROCESSING,
143 .selector = UVC_PU_HUE_AUTO_CONTROL,
144 .index = 11,
145 .size = 1,
146 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
147 | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE,
148 },
149 {
150 .entity = UVC_GUID_UVC_PROCESSING,
151 .selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
152 .index = 12,
153 .size = 1,
154 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
155 | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE,
156 },
157 {
158 .entity = UVC_GUID_UVC_PROCESSING,
159 .selector = UVC_PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
160 .index = 13,
161 .size = 1,
162 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
163 | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE,
164 },
165 {
166 .entity = UVC_GUID_UVC_PROCESSING,
167 .selector = UVC_PU_DIGITAL_MULTIPLIER_CONTROL,
168 .index = 14,
169 .size = 2,
170 .flags = UVC_CTRL_FLAG_SET_CUR
171 | UVC_CTRL_FLAG_GET_RANGE
172 | UVC_CTRL_FLAG_RESTORE,
173 },
174 {
175 .entity = UVC_GUID_UVC_PROCESSING,
176 .selector = UVC_PU_DIGITAL_MULTIPLIER_LIMIT_CONTROL,
177 .index = 15,
178 .size = 2,
179 .flags = UVC_CTRL_FLAG_SET_CUR
180 | UVC_CTRL_FLAG_GET_RANGE
181 | UVC_CTRL_FLAG_RESTORE,
182 },
183 {
184 .entity = UVC_GUID_UVC_PROCESSING,
185 .selector = UVC_PU_ANALOG_VIDEO_STANDARD_CONTROL,
186 .index = 16,
187 .size = 1,
188 .flags = UVC_CTRL_FLAG_GET_CUR,
189 },
190 {
191 .entity = UVC_GUID_UVC_PROCESSING,
192 .selector = UVC_PU_ANALOG_LOCK_STATUS_CONTROL,
193 .index = 17,
194 .size = 1,
195 .flags = UVC_CTRL_FLAG_GET_CUR,
196 },
197 {
198 .entity = UVC_GUID_UVC_CAMERA,
199 .selector = UVC_CT_SCANNING_MODE_CONTROL,
200 .index = 0,
201 .size = 1,
202 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
203 | UVC_CTRL_FLAG_RESTORE,
204 },
205 {
206 .entity = UVC_GUID_UVC_CAMERA,
207 .selector = UVC_CT_AE_MODE_CONTROL,
208 .index = 1,
209 .size = 1,
210 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
211 | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_GET_RES
212 | UVC_CTRL_FLAG_RESTORE,
213 },
214 {
215 .entity = UVC_GUID_UVC_CAMERA,
216 .selector = UVC_CT_AE_PRIORITY_CONTROL,
217 .index = 2,
218 .size = 1,
219 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
220 | UVC_CTRL_FLAG_RESTORE,
221 },
222 {
223 .entity = UVC_GUID_UVC_CAMERA,
224 .selector = UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
225 .index = 3,
226 .size = 4,
227 .flags = UVC_CTRL_FLAG_SET_CUR
228 | UVC_CTRL_FLAG_GET_RANGE
229 | UVC_CTRL_FLAG_RESTORE,
230 },
231 {
232 .entity = UVC_GUID_UVC_CAMERA,
233 .selector = UVC_CT_EXPOSURE_TIME_RELATIVE_CONTROL,
234 .index = 4,
235 .size = 1,
236 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_RESTORE,
237 },
238 {
239 .entity = UVC_GUID_UVC_CAMERA,
240 .selector = UVC_CT_FOCUS_ABSOLUTE_CONTROL,
241 .index = 5,
242 .size = 2,
243 .flags = UVC_CTRL_FLAG_SET_CUR
244 | UVC_CTRL_FLAG_GET_RANGE
245 | UVC_CTRL_FLAG_RESTORE
246 | UVC_CTRL_FLAG_AUTO_UPDATE,
247 },
248 {
249 .entity = UVC_GUID_UVC_CAMERA,
250 .selector = UVC_CT_FOCUS_RELATIVE_CONTROL,
251 .index = 6,
252 .size = 2,
253 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_MIN
254 | UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES
255 | UVC_CTRL_FLAG_GET_DEF
256 | UVC_CTRL_FLAG_AUTO_UPDATE,
257 },
258 {
259 .entity = UVC_GUID_UVC_CAMERA,
260 .selector = UVC_CT_IRIS_ABSOLUTE_CONTROL,
261 .index = 7,
262 .size = 2,
263 .flags = UVC_CTRL_FLAG_SET_CUR
264 | UVC_CTRL_FLAG_GET_RANGE
265 | UVC_CTRL_FLAG_RESTORE
266 | UVC_CTRL_FLAG_AUTO_UPDATE,
267 },
268 {
269 .entity = UVC_GUID_UVC_CAMERA,
270 .selector = UVC_CT_IRIS_RELATIVE_CONTROL,
271 .index = 8,
272 .size = 1,
273 .flags = UVC_CTRL_FLAG_SET_CUR
274 | UVC_CTRL_FLAG_AUTO_UPDATE,
275 },
276 {
277 .entity = UVC_GUID_UVC_CAMERA,
278 .selector = UVC_CT_ZOOM_ABSOLUTE_CONTROL,
279 .index = 9,
280 .size = 2,
281 .flags = UVC_CTRL_FLAG_SET_CUR
282 | UVC_CTRL_FLAG_GET_RANGE
283 | UVC_CTRL_FLAG_RESTORE
284 | UVC_CTRL_FLAG_AUTO_UPDATE,
285 },
286 {
287 .entity = UVC_GUID_UVC_CAMERA,
288 .selector = UVC_CT_ZOOM_RELATIVE_CONTROL,
289 .index = 10,
290 .size = 3,
291 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_MIN
292 | UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES
293 | UVC_CTRL_FLAG_GET_DEF
294 | UVC_CTRL_FLAG_AUTO_UPDATE,
295 },
296 {
297 .entity = UVC_GUID_UVC_CAMERA,
298 .selector = UVC_CT_PANTILT_ABSOLUTE_CONTROL,
299 .index = 11,
300 .size = 8,
301 .flags = UVC_CTRL_FLAG_SET_CUR
302 | UVC_CTRL_FLAG_GET_RANGE
303 | UVC_CTRL_FLAG_RESTORE
304 | UVC_CTRL_FLAG_AUTO_UPDATE,
305 },
306 {
307 .entity = UVC_GUID_UVC_CAMERA,
308 .selector = UVC_CT_PANTILT_RELATIVE_CONTROL,
309 .index = 12,
310 .size = 4,
311 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_MIN
312 | UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES
313 | UVC_CTRL_FLAG_GET_DEF
314 | UVC_CTRL_FLAG_AUTO_UPDATE,
315 },
316 {
317 .entity = UVC_GUID_UVC_CAMERA,
318 .selector = UVC_CT_ROLL_ABSOLUTE_CONTROL,
319 .index = 13,
320 .size = 2,
321 .flags = UVC_CTRL_FLAG_SET_CUR
322 | UVC_CTRL_FLAG_GET_RANGE
323 | UVC_CTRL_FLAG_RESTORE
324 | UVC_CTRL_FLAG_AUTO_UPDATE,
325 },
326 {
327 .entity = UVC_GUID_UVC_CAMERA,
328 .selector = UVC_CT_ROLL_RELATIVE_CONTROL,
329 .index = 14,
330 .size = 2,
331 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_MIN
332 | UVC_CTRL_FLAG_GET_MAX | UVC_CTRL_FLAG_GET_RES
333 | UVC_CTRL_FLAG_GET_DEF
334 | UVC_CTRL_FLAG_AUTO_UPDATE,
335 },
336 {
337 .entity = UVC_GUID_UVC_CAMERA,
338 .selector = UVC_CT_FOCUS_AUTO_CONTROL,
339 .index = 17,
340 .size = 1,
341 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
342 | UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_RESTORE,
343 },
344 {
345 .entity = UVC_GUID_UVC_CAMERA,
346 .selector = UVC_CT_PRIVACY_CONTROL,
347 .index = 18,
348 .size = 1,
349 .flags = UVC_CTRL_FLAG_SET_CUR | UVC_CTRL_FLAG_GET_CUR
350 | UVC_CTRL_FLAG_RESTORE
351 | UVC_CTRL_FLAG_AUTO_UPDATE,
352 },
353 };
354
355 static struct uvc_menu_info power_line_frequency_controls[] = {
356 { 0, "Disabled" },
357 { 1, "50 Hz" },
358 { 2, "60 Hz" },
359 };
360
361 static struct uvc_menu_info exposure_auto_controls[] = {
362 { 2, "Auto Mode" },
363 { 1, "Manual Mode" },
364 { 4, "Shutter Priority Mode" },
365 { 8, "Aperture Priority Mode" },
366 };
367
368 static __s32 uvc_ctrl_get_zoom(struct uvc_control_mapping *mapping,
369 __u8 query, const __u8 *data)
370 {
371 __s8 zoom = (__s8)data[0];
372
373 switch (query) {
374 case UVC_GET_CUR:
375 return (zoom == 0) ? 0 : (zoom > 0 ? data[2] : -data[2]);
376
377 case UVC_GET_MIN:
378 case UVC_GET_MAX:
379 case UVC_GET_RES:
380 case UVC_GET_DEF:
381 default:
382 return data[2];
383 }
384 }
385
386 static void uvc_ctrl_set_zoom(struct uvc_control_mapping *mapping,
387 __s32 value, __u8 *data)
388 {
389 data[0] = value == 0 ? 0 : (value > 0) ? 1 : 0xff;
390 data[2] = min((int)abs(value), 0xff);
391 }
392
393 static struct uvc_control_mapping uvc_ctrl_mappings[] = {
394 {
395 .id = V4L2_CID_BRIGHTNESS,
396 .name = "Brightness",
397 .entity = UVC_GUID_UVC_PROCESSING,
398 .selector = UVC_PU_BRIGHTNESS_CONTROL,
399 .size = 16,
400 .offset = 0,
401 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
402 .data_type = UVC_CTRL_DATA_TYPE_SIGNED,
403 },
404 {
405 .id = V4L2_CID_CONTRAST,
406 .name = "Contrast",
407 .entity = UVC_GUID_UVC_PROCESSING,
408 .selector = UVC_PU_CONTRAST_CONTROL,
409 .size = 16,
410 .offset = 0,
411 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
412 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
413 },
414 {
415 .id = V4L2_CID_HUE,
416 .name = "Hue",
417 .entity = UVC_GUID_UVC_PROCESSING,
418 .selector = UVC_PU_HUE_CONTROL,
419 .size = 16,
420 .offset = 0,
421 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
422 .data_type = UVC_CTRL_DATA_TYPE_SIGNED,
423 },
424 {
425 .id = V4L2_CID_SATURATION,
426 .name = "Saturation",
427 .entity = UVC_GUID_UVC_PROCESSING,
428 .selector = UVC_PU_SATURATION_CONTROL,
429 .size = 16,
430 .offset = 0,
431 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
432 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
433 },
434 {
435 .id = V4L2_CID_SHARPNESS,
436 .name = "Sharpness",
437 .entity = UVC_GUID_UVC_PROCESSING,
438 .selector = UVC_PU_SHARPNESS_CONTROL,
439 .size = 16,
440 .offset = 0,
441 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
442 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
443 },
444 {
445 .id = V4L2_CID_GAMMA,
446 .name = "Gamma",
447 .entity = UVC_GUID_UVC_PROCESSING,
448 .selector = UVC_PU_GAMMA_CONTROL,
449 .size = 16,
450 .offset = 0,
451 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
452 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
453 },
454 {
455 .id = V4L2_CID_BACKLIGHT_COMPENSATION,
456 .name = "Backlight Compensation",
457 .entity = UVC_GUID_UVC_PROCESSING,
458 .selector = UVC_PU_BACKLIGHT_COMPENSATION_CONTROL,
459 .size = 16,
460 .offset = 0,
461 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
462 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
463 },
464 {
465 .id = V4L2_CID_GAIN,
466 .name = "Gain",
467 .entity = UVC_GUID_UVC_PROCESSING,
468 .selector = UVC_PU_GAIN_CONTROL,
469 .size = 16,
470 .offset = 0,
471 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
472 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
473 },
474 {
475 .id = V4L2_CID_POWER_LINE_FREQUENCY,
476 .name = "Power Line Frequency",
477 .entity = UVC_GUID_UVC_PROCESSING,
478 .selector = UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
479 .size = 2,
480 .offset = 0,
481 .v4l2_type = V4L2_CTRL_TYPE_MENU,
482 .data_type = UVC_CTRL_DATA_TYPE_ENUM,
483 .menu_info = power_line_frequency_controls,
484 .menu_count = ARRAY_SIZE(power_line_frequency_controls),
485 },
486 {
487 .id = V4L2_CID_HUE_AUTO,
488 .name = "Hue, Auto",
489 .entity = UVC_GUID_UVC_PROCESSING,
490 .selector = UVC_PU_HUE_AUTO_CONTROL,
491 .size = 1,
492 .offset = 0,
493 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
494 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
495 },
496 {
497 .id = V4L2_CID_EXPOSURE_AUTO,
498 .name = "Exposure, Auto",
499 .entity = UVC_GUID_UVC_CAMERA,
500 .selector = UVC_CT_AE_MODE_CONTROL,
501 .size = 4,
502 .offset = 0,
503 .v4l2_type = V4L2_CTRL_TYPE_MENU,
504 .data_type = UVC_CTRL_DATA_TYPE_BITMASK,
505 .menu_info = exposure_auto_controls,
506 .menu_count = ARRAY_SIZE(exposure_auto_controls),
507 },
508 {
509 .id = V4L2_CID_EXPOSURE_AUTO_PRIORITY,
510 .name = "Exposure, Auto Priority",
511 .entity = UVC_GUID_UVC_CAMERA,
512 .selector = UVC_CT_AE_PRIORITY_CONTROL,
513 .size = 1,
514 .offset = 0,
515 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
516 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
517 },
518 {
519 .id = V4L2_CID_EXPOSURE_ABSOLUTE,
520 .name = "Exposure (Absolute)",
521 .entity = UVC_GUID_UVC_CAMERA,
522 .selector = UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
523 .size = 32,
524 .offset = 0,
525 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
526 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
527 },
528 {
529 .id = V4L2_CID_AUTO_WHITE_BALANCE,
530 .name = "White Balance Temperature, Auto",
531 .entity = UVC_GUID_UVC_PROCESSING,
532 .selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
533 .size = 1,
534 .offset = 0,
535 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
536 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
537 },
538 {
539 .id = V4L2_CID_WHITE_BALANCE_TEMPERATURE,
540 .name = "White Balance Temperature",
541 .entity = UVC_GUID_UVC_PROCESSING,
542 .selector = UVC_PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
543 .size = 16,
544 .offset = 0,
545 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
546 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
547 },
548 {
549 .id = V4L2_CID_AUTO_WHITE_BALANCE,
550 .name = "White Balance Component, Auto",
551 .entity = UVC_GUID_UVC_PROCESSING,
552 .selector = UVC_PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
553 .size = 1,
554 .offset = 0,
555 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
556 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
557 },
558 {
559 .id = V4L2_CID_BLUE_BALANCE,
560 .name = "White Balance Blue Component",
561 .entity = UVC_GUID_UVC_PROCESSING,
562 .selector = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
563 .size = 16,
564 .offset = 0,
565 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
566 .data_type = UVC_CTRL_DATA_TYPE_SIGNED,
567 },
568 {
569 .id = V4L2_CID_RED_BALANCE,
570 .name = "White Balance Red Component",
571 .entity = UVC_GUID_UVC_PROCESSING,
572 .selector = UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
573 .size = 16,
574 .offset = 16,
575 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
576 .data_type = UVC_CTRL_DATA_TYPE_SIGNED,
577 },
578 {
579 .id = V4L2_CID_FOCUS_ABSOLUTE,
580 .name = "Focus (absolute)",
581 .entity = UVC_GUID_UVC_CAMERA,
582 .selector = UVC_CT_FOCUS_ABSOLUTE_CONTROL,
583 .size = 16,
584 .offset = 0,
585 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
586 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
587 },
588 {
589 .id = V4L2_CID_FOCUS_AUTO,
590 .name = "Focus, Auto",
591 .entity = UVC_GUID_UVC_CAMERA,
592 .selector = UVC_CT_FOCUS_AUTO_CONTROL,
593 .size = 1,
594 .offset = 0,
595 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
596 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
597 },
598 {
599 .id = V4L2_CID_IRIS_ABSOLUTE,
600 .name = "Iris, Absolute",
601 .entity = UVC_GUID_UVC_CAMERA,
602 .selector = UVC_CT_IRIS_ABSOLUTE_CONTROL,
603 .size = 16,
604 .offset = 0,
605 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
606 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
607 },
608 {
609 .id = V4L2_CID_IRIS_RELATIVE,
610 .name = "Iris, Relative",
611 .entity = UVC_GUID_UVC_CAMERA,
612 .selector = UVC_CT_IRIS_RELATIVE_CONTROL,
613 .size = 8,
614 .offset = 0,
615 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
616 .data_type = UVC_CTRL_DATA_TYPE_SIGNED,
617 },
618 {
619 .id = V4L2_CID_ZOOM_ABSOLUTE,
620 .name = "Zoom, Absolute",
621 .entity = UVC_GUID_UVC_CAMERA,
622 .selector = UVC_CT_ZOOM_ABSOLUTE_CONTROL,
623 .size = 16,
624 .offset = 0,
625 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
626 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
627 },
628 {
629 .id = V4L2_CID_ZOOM_CONTINUOUS,
630 .name = "Zoom, Continuous",
631 .entity = UVC_GUID_UVC_CAMERA,
632 .selector = UVC_CT_ZOOM_RELATIVE_CONTROL,
633 .size = 0,
634 .offset = 0,
635 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
636 .data_type = UVC_CTRL_DATA_TYPE_SIGNED,
637 .get = uvc_ctrl_get_zoom,
638 .set = uvc_ctrl_set_zoom,
639 },
640 {
641 .id = V4L2_CID_PAN_ABSOLUTE,
642 .name = "Pan (Absolute)",
643 .entity = UVC_GUID_UVC_CAMERA,
644 .selector = UVC_CT_PANTILT_ABSOLUTE_CONTROL,
645 .size = 32,
646 .offset = 0,
647 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
648 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
649 },
650 {
651 .id = V4L2_CID_TILT_ABSOLUTE,
652 .name = "Tilt (Absolute)",
653 .entity = UVC_GUID_UVC_CAMERA,
654 .selector = UVC_CT_PANTILT_ABSOLUTE_CONTROL,
655 .size = 32,
656 .offset = 32,
657 .v4l2_type = V4L2_CTRL_TYPE_INTEGER,
658 .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED,
659 },
660 {
661 .id = V4L2_CID_PRIVACY,
662 .name = "Privacy",
663 .entity = UVC_GUID_UVC_CAMERA,
664 .selector = UVC_CT_PRIVACY_CONTROL,
665 .size = 1,
666 .offset = 0,
667 .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN,
668 .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN,
669 },
670 };
671
672 /* ------------------------------------------------------------------------
673 * Utility functions
674 */
675
676 static inline __u8 *uvc_ctrl_data(struct uvc_control *ctrl, int id)
677 {
678 return ctrl->uvc_data + id * ctrl->info.size;
679 }
680
681 static inline int uvc_test_bit(const __u8 *data, int bit)
682 {
683 return (data[bit >> 3] >> (bit & 7)) & 1;
684 }
685
686 static inline void uvc_clear_bit(__u8 *data, int bit)
687 {
688 data[bit >> 3] &= ~(1 << (bit & 7));
689 }
690
691 /* Extract the bit string specified by mapping->offset and mapping->size
692 * from the little-endian data stored at 'data' and return the result as
693 * a signed 32bit integer. Sign extension will be performed if the mapping
694 * references a signed data type.
695 */
696 static __s32 uvc_get_le_value(struct uvc_control_mapping *mapping,
697 __u8 query, const __u8 *data)
698 {
699 int bits = mapping->size;
700 int offset = mapping->offset;
701 __s32 value = 0;
702 __u8 mask;
703
704 data += offset / 8;
705 offset &= 7;
706 mask = ((1LL << bits) - 1) << offset;
707
708 for (; bits > 0; data++) {
709 __u8 byte = *data & mask;
710 value |= offset > 0 ? (byte >> offset) : (byte << (-offset));
711 bits -= 8 - (offset > 0 ? offset : 0);
712 offset -= 8;
713 mask = (1 << bits) - 1;
714 }
715
716 /* Sign-extend the value if needed. */
717 if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED)
718 value |= -(value & (1 << (mapping->size - 1)));
719
720 return value;
721 }
722
723 /* Set the bit string specified by mapping->offset and mapping->size
724 * in the little-endian data stored at 'data' to the value 'value'.
725 */
726 static void uvc_set_le_value(struct uvc_control_mapping *mapping,
727 __s32 value, __u8 *data)
728 {
729 int bits = mapping->size;
730 int offset = mapping->offset;
731 __u8 mask;
732
733 /* According to the v4l2 spec, writing any value to a button control
734 * should result in the action belonging to the button control being
735 * triggered. UVC devices however want to see a 1 written -> override
736 * value.
737 */
738 if (mapping->v4l2_type == V4L2_CTRL_TYPE_BUTTON)
739 value = -1;
740
741 data += offset / 8;
742 offset &= 7;
743
744 for (; bits > 0; data++) {
745 mask = ((1LL << bits) - 1) << offset;
746 *data = (*data & ~mask) | ((value << offset) & mask);
747 value >>= offset ? offset : 8;
748 bits -= 8 - offset;
749 offset = 0;
750 }
751 }
752
753 /* ------------------------------------------------------------------------
754 * Terminal and unit management
755 */
756
757 static const __u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
758 static const __u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA;
759 static const __u8 uvc_media_transport_input_guid[16] =
760 UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
761
762 static int uvc_entity_match_guid(const struct uvc_entity *entity,
763 const __u8 guid[16])
764 {
765 switch (UVC_ENTITY_TYPE(entity)) {
766 case UVC_ITT_CAMERA:
767 return memcmp(uvc_camera_guid, guid, 16) == 0;
768
769 case UVC_ITT_MEDIA_TRANSPORT_INPUT:
770 return memcmp(uvc_media_transport_input_guid, guid, 16) == 0;
771
772 case UVC_VC_PROCESSING_UNIT:
773 return memcmp(uvc_processing_guid, guid, 16) == 0;
774
775 case UVC_VC_EXTENSION_UNIT:
776 return memcmp(entity->extension.guidExtensionCode,
777 guid, 16) == 0;
778
779 default:
780 return 0;
781 }
782 }
783
784 /* ------------------------------------------------------------------------
785 * UVC Controls
786 */
787
788 static void __uvc_find_control(struct uvc_entity *entity, __u32 v4l2_id,
789 struct uvc_control_mapping **mapping, struct uvc_control **control,
790 int next)
791 {
792 struct uvc_control *ctrl;
793 struct uvc_control_mapping *map;
794 unsigned int i;
795
796 if (entity == NULL)
797 return;
798
799 for (i = 0; i < entity->ncontrols; ++i) {
800 ctrl = &entity->controls[i];
801 if (!ctrl->initialized)
802 continue;
803
804 list_for_each_entry(map, &ctrl->info.mappings, list) {
805 if ((map->id == v4l2_id) && !next) {
806 *control = ctrl;
807 *mapping = map;
808 return;
809 }
810
811 if ((*mapping == NULL || (*mapping)->id > map->id) &&
812 (map->id > v4l2_id) && next) {
813 *control = ctrl;
814 *mapping = map;
815 }
816 }
817 }
818 }
819
820 static struct uvc_control *uvc_find_control(struct uvc_video_chain *chain,
821 __u32 v4l2_id, struct uvc_control_mapping **mapping)
822 {
823 struct uvc_control *ctrl = NULL;
824 struct uvc_entity *entity;
825 int next = v4l2_id & V4L2_CTRL_FLAG_NEXT_CTRL;
826
827 *mapping = NULL;
828
829 /* Mask the query flags. */
830 v4l2_id &= V4L2_CTRL_ID_MASK;
831
832 /* Find the control. */
833 list_for_each_entry(entity, &chain->entities, chain) {
834 __uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
835 if (ctrl && !next)
836 return ctrl;
837 }
838
839 if (ctrl == NULL && !next)
840 uvc_trace(UVC_TRACE_CONTROL, "Control 0x%08x not found.\n",
841 v4l2_id);
842
843 return ctrl;
844 }
845
846 static int uvc_ctrl_populate_cache(struct uvc_video_chain *chain,
847 struct uvc_control *ctrl)
848 {
849 int ret;
850
851 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_DEF) {
852 ret = uvc_query_ctrl(chain->dev, UVC_GET_DEF, ctrl->entity->id,
853 chain->dev->intfnum, ctrl->info.selector,
854 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_DEF),
855 ctrl->info.size);
856 if (ret < 0)
857 return ret;
858 }
859
860 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN) {
861 ret = uvc_query_ctrl(chain->dev, UVC_GET_MIN, ctrl->entity->id,
862 chain->dev->intfnum, ctrl->info.selector,
863 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN),
864 ctrl->info.size);
865 if (ret < 0)
866 return ret;
867 }
868 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MAX) {
869 ret = uvc_query_ctrl(chain->dev, UVC_GET_MAX, ctrl->entity->id,
870 chain->dev->intfnum, ctrl->info.selector,
871 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX),
872 ctrl->info.size);
873 if (ret < 0)
874 return ret;
875 }
876 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES) {
877 ret = uvc_query_ctrl(chain->dev, UVC_GET_RES, ctrl->entity->id,
878 chain->dev->intfnum, ctrl->info.selector,
879 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES),
880 ctrl->info.size);
881 if (ret < 0) {
882 if (UVC_ENTITY_TYPE(ctrl->entity) !=
883 UVC_VC_EXTENSION_UNIT)
884 return ret;
885
886 /* GET_RES is mandatory for XU controls, but some
887 * cameras still choke on it. Ignore errors and set the
888 * resolution value to zero.
889 */
890 uvc_warn_once(chain->dev, UVC_WARN_XU_GET_RES,
891 "UVC non compliance - GET_RES failed on "
892 "an XU control. Enabling workaround.\n");
893 memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES), 0,
894 ctrl->info.size);
895 }
896 }
897
898 ctrl->cached = 1;
899 return 0;
900 }
901
902 int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
903 struct v4l2_queryctrl *v4l2_ctrl)
904 {
905 struct uvc_control *ctrl;
906 struct uvc_control_mapping *mapping;
907 struct uvc_menu_info *menu;
908 unsigned int i;
909 int ret;
910
911 ret = mutex_lock_interruptible(&chain->ctrl_mutex);
912 if (ret < 0)
913 return -ERESTARTSYS;
914
915 ctrl = uvc_find_control(chain, v4l2_ctrl->id, &mapping);
916 if (ctrl == NULL) {
917 ret = -EINVAL;
918 goto done;
919 }
920
921 memset(v4l2_ctrl, 0, sizeof *v4l2_ctrl);
922 v4l2_ctrl->id = mapping->id;
923 v4l2_ctrl->type = mapping->v4l2_type;
924 strlcpy(v4l2_ctrl->name, mapping->name, sizeof v4l2_ctrl->name);
925 v4l2_ctrl->flags = 0;
926
927 if (!(ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR))
928 v4l2_ctrl->flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
929 if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR))
930 v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
931
932 if (!ctrl->cached) {
933 ret = uvc_ctrl_populate_cache(chain, ctrl);
934 if (ret < 0)
935 goto done;
936 }
937
938 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_DEF) {
939 v4l2_ctrl->default_value = mapping->get(mapping, UVC_GET_DEF,
940 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_DEF));
941 }
942
943 switch (mapping->v4l2_type) {
944 case V4L2_CTRL_TYPE_MENU:
945 v4l2_ctrl->minimum = 0;
946 v4l2_ctrl->maximum = mapping->menu_count - 1;
947 v4l2_ctrl->step = 1;
948
949 menu = mapping->menu_info;
950 for (i = 0; i < mapping->menu_count; ++i, ++menu) {
951 if (menu->value == v4l2_ctrl->default_value) {
952 v4l2_ctrl->default_value = i;
953 break;
954 }
955 }
956
957 goto done;
958
959 case V4L2_CTRL_TYPE_BOOLEAN:
960 v4l2_ctrl->minimum = 0;
961 v4l2_ctrl->maximum = 1;
962 v4l2_ctrl->step = 1;
963 goto done;
964
965 case V4L2_CTRL_TYPE_BUTTON:
966 v4l2_ctrl->minimum = 0;
967 v4l2_ctrl->maximum = 0;
968 v4l2_ctrl->step = 0;
969 goto done;
970
971 default:
972 break;
973 }
974
975 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN)
976 v4l2_ctrl->minimum = mapping->get(mapping, UVC_GET_MIN,
977 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
978
979 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MAX)
980 v4l2_ctrl->maximum = mapping->get(mapping, UVC_GET_MAX,
981 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
982
983 if (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES)
984 v4l2_ctrl->step = mapping->get(mapping, UVC_GET_RES,
985 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
986
987 done:
988 mutex_unlock(&chain->ctrl_mutex);
989 return ret;
990 }
991
992 /*
993 * Mapping V4L2 controls to UVC controls can be straighforward if done well.
994 * Most of the UVC controls exist in V4L2, and can be mapped directly. Some
995 * must be grouped (for instance the Red Balance, Blue Balance and Do White
996 * Balance V4L2 controls use the White Balance Component UVC control) or
997 * otherwise translated. The approach we take here is to use a translation
998 * table for the controls that can be mapped directly, and handle the others
999 * manually.
1000 */
1001 int uvc_query_v4l2_menu(struct uvc_video_chain *chain,
1002 struct v4l2_querymenu *query_menu)
1003 {
1004 struct uvc_menu_info *menu_info;
1005 struct uvc_control_mapping *mapping;
1006 struct uvc_control *ctrl;
1007 u32 index = query_menu->index;
1008 u32 id = query_menu->id;
1009 int ret;
1010
1011 memset(query_menu, 0, sizeof(*query_menu));
1012 query_menu->id = id;
1013 query_menu->index = index;
1014
1015 ret = mutex_lock_interruptible(&chain->ctrl_mutex);
1016 if (ret < 0)
1017 return -ERESTARTSYS;
1018
1019 ctrl = uvc_find_control(chain, query_menu->id, &mapping);
1020 if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU) {
1021 ret = -EINVAL;
1022 goto done;
1023 }
1024
1025 if (query_menu->index >= mapping->menu_count) {
1026 ret = -EINVAL;
1027 goto done;
1028 }
1029
1030 menu_info = &mapping->menu_info[query_menu->index];
1031
1032 if (mapping->data_type == UVC_CTRL_DATA_TYPE_BITMASK &&
1033 (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES)) {
1034 s32 bitmap;
1035
1036 if (!ctrl->cached) {
1037 ret = uvc_ctrl_populate_cache(chain, ctrl);
1038 if (ret < 0)
1039 goto done;
1040 }
1041
1042 bitmap = mapping->get(mapping, UVC_GET_RES,
1043 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
1044 if (!(bitmap & menu_info->value)) {
1045 ret = -EINVAL;
1046 goto done;
1047 }
1048 }
1049
1050 strlcpy(query_menu->name, menu_info->name, sizeof query_menu->name);
1051
1052 done:
1053 mutex_unlock(&chain->ctrl_mutex);
1054 return ret;
1055 }
1056
1057
1058 /* --------------------------------------------------------------------------
1059 * Control transactions
1060 *
1061 * To make extended set operations as atomic as the hardware allows, controls
1062 * are handled using begin/commit/rollback operations.
1063 *
1064 * At the beginning of a set request, uvc_ctrl_begin should be called to
1065 * initialize the request. This function acquires the control lock.
1066 *
1067 * When setting a control, the new value is stored in the control data field
1068 * at position UVC_CTRL_DATA_CURRENT. The control is then marked as dirty for
1069 * later processing. If the UVC and V4L2 control sizes differ, the current
1070 * value is loaded from the hardware before storing the new value in the data
1071 * field.
1072 *
1073 * After processing all controls in the transaction, uvc_ctrl_commit or
1074 * uvc_ctrl_rollback must be called to apply the pending changes to the
1075 * hardware or revert them. When applying changes, all controls marked as
1076 * dirty will be modified in the UVC device, and the dirty flag will be
1077 * cleared. When reverting controls, the control data field
1078 * UVC_CTRL_DATA_CURRENT is reverted to its previous value
1079 * (UVC_CTRL_DATA_BACKUP) for all dirty controls. Both functions release the
1080 * control lock.
1081 */
1082 int uvc_ctrl_begin(struct uvc_video_chain *chain)
1083 {
1084 return mutex_lock_interruptible(&chain->ctrl_mutex) ? -ERESTARTSYS : 0;
1085 }
1086
1087 static int uvc_ctrl_commit_entity(struct uvc_device *dev,
1088 struct uvc_entity *entity, int rollback)
1089 {
1090 struct uvc_control *ctrl;
1091 unsigned int i;
1092 int ret;
1093
1094 if (entity == NULL)
1095 return 0;
1096
1097 for (i = 0; i < entity->ncontrols; ++i) {
1098 ctrl = &entity->controls[i];
1099 if (!ctrl->initialized)
1100 continue;
1101
1102 /* Reset the loaded flag for auto-update controls that were
1103 * marked as loaded in uvc_ctrl_get/uvc_ctrl_set to prevent
1104 * uvc_ctrl_get from using the cached value.
1105 */
1106 if (ctrl->info.flags & UVC_CTRL_FLAG_AUTO_UPDATE)
1107 ctrl->loaded = 0;
1108
1109 if (!ctrl->dirty)
1110 continue;
1111
1112 if (!rollback)
1113 ret = uvc_query_ctrl(dev, UVC_SET_CUR, ctrl->entity->id,
1114 dev->intfnum, ctrl->info.selector,
1115 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1116 ctrl->info.size);
1117 else
1118 ret = 0;
1119
1120 if (rollback || ret < 0)
1121 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1122 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1123 ctrl->info.size);
1124
1125 ctrl->dirty = 0;
1126
1127 if (ret < 0)
1128 return ret;
1129 }
1130
1131 return 0;
1132 }
1133
1134 int __uvc_ctrl_commit(struct uvc_video_chain *chain, int rollback)
1135 {
1136 struct uvc_entity *entity;
1137 int ret = 0;
1138
1139 /* Find the control. */
1140 list_for_each_entry(entity, &chain->entities, chain) {
1141 ret = uvc_ctrl_commit_entity(chain->dev, entity, rollback);
1142 if (ret < 0)
1143 goto done;
1144 }
1145
1146 done:
1147 mutex_unlock(&chain->ctrl_mutex);
1148 return ret;
1149 }
1150
1151 int uvc_ctrl_get(struct uvc_video_chain *chain,
1152 struct v4l2_ext_control *xctrl)
1153 {
1154 struct uvc_control *ctrl;
1155 struct uvc_control_mapping *mapping;
1156 struct uvc_menu_info *menu;
1157 unsigned int i;
1158 int ret;
1159
1160 ctrl = uvc_find_control(chain, xctrl->id, &mapping);
1161 if (ctrl == NULL || (ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR) == 0)
1162 return -EINVAL;
1163
1164 if (!ctrl->loaded) {
1165 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, ctrl->entity->id,
1166 chain->dev->intfnum, ctrl->info.selector,
1167 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1168 ctrl->info.size);
1169 if (ret < 0)
1170 return ret;
1171
1172 ctrl->loaded = 1;
1173 }
1174
1175 xctrl->value = mapping->get(mapping, UVC_GET_CUR,
1176 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
1177
1178 if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) {
1179 menu = mapping->menu_info;
1180 for (i = 0; i < mapping->menu_count; ++i, ++menu) {
1181 if (menu->value == xctrl->value) {
1182 xctrl->value = i;
1183 break;
1184 }
1185 }
1186 }
1187
1188 return 0;
1189 }
1190
1191 int uvc_ctrl_set(struct uvc_video_chain *chain,
1192 struct v4l2_ext_control *xctrl)
1193 {
1194 struct uvc_control *ctrl;
1195 struct uvc_control_mapping *mapping;
1196 s32 value;
1197 u32 step;
1198 s32 min;
1199 s32 max;
1200 int ret;
1201
1202 ctrl = uvc_find_control(chain, xctrl->id, &mapping);
1203 if (ctrl == NULL || (ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR) == 0)
1204 return -EINVAL;
1205
1206 /* Clamp out of range values. */
1207 switch (mapping->v4l2_type) {
1208 case V4L2_CTRL_TYPE_INTEGER:
1209 if (!ctrl->cached) {
1210 ret = uvc_ctrl_populate_cache(chain, ctrl);
1211 if (ret < 0)
1212 return ret;
1213 }
1214
1215 min = mapping->get(mapping, UVC_GET_MIN,
1216 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
1217 max = mapping->get(mapping, UVC_GET_MAX,
1218 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
1219 step = mapping->get(mapping, UVC_GET_RES,
1220 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
1221 if (step == 0)
1222 step = 1;
1223
1224 xctrl->value = min + (xctrl->value - min + step/2) / step * step;
1225 xctrl->value = clamp(xctrl->value, min, max);
1226 value = xctrl->value;
1227 break;
1228
1229 case V4L2_CTRL_TYPE_BOOLEAN:
1230 xctrl->value = clamp(xctrl->value, 0, 1);
1231 value = xctrl->value;
1232 break;
1233
1234 case V4L2_CTRL_TYPE_MENU:
1235 if (xctrl->value < 0 || xctrl->value >= mapping->menu_count)
1236 return -ERANGE;
1237 value = mapping->menu_info[xctrl->value].value;
1238
1239 /* Valid menu indices are reported by the GET_RES request for
1240 * UVC controls that support it.
1241 */
1242 if (mapping->data_type == UVC_CTRL_DATA_TYPE_BITMASK &&
1243 (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES)) {
1244 if (!ctrl->cached) {
1245 ret = uvc_ctrl_populate_cache(chain, ctrl);
1246 if (ret < 0)
1247 return ret;
1248 }
1249
1250 step = mapping->get(mapping, UVC_GET_RES,
1251 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
1252 if (!(step & value))
1253 return -ERANGE;
1254 }
1255
1256 break;
1257
1258 default:
1259 value = xctrl->value;
1260 break;
1261 }
1262
1263 /* If the mapping doesn't span the whole UVC control, the current value
1264 * needs to be loaded from the device to perform the read-modify-write
1265 * operation.
1266 */
1267 if (!ctrl->loaded && (ctrl->info.size * 8) != mapping->size) {
1268 if ((ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR) == 0) {
1269 memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1270 0, ctrl->info.size);
1271 } else {
1272 ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
1273 ctrl->entity->id, chain->dev->intfnum,
1274 ctrl->info.selector,
1275 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1276 ctrl->info.size);
1277 if (ret < 0)
1278 return ret;
1279 }
1280
1281 ctrl->loaded = 1;
1282 }
1283
1284 /* Backup the current value in case we need to rollback later. */
1285 if (!ctrl->dirty) {
1286 memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
1287 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
1288 ctrl->info.size);
1289 }
1290
1291 mapping->set(mapping, value,
1292 uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT));
1293
1294 ctrl->dirty = 1;
1295 ctrl->modified = 1;
1296 return 0;
1297 }
1298
1299 /* --------------------------------------------------------------------------
1300 * Dynamic controls
1301 */
1302
1303 static void uvc_ctrl_fixup_xu_info(struct uvc_device *dev,
1304 const struct uvc_control *ctrl, struct uvc_control_info *info)
1305 {
1306 struct uvc_ctrl_fixup {
1307 struct usb_device_id id;
1308 u8 entity;
1309 u8 selector;
1310 u8 flags;
1311 };
1312
1313 static const struct uvc_ctrl_fixup fixups[] = {
1314 { { USB_DEVICE(0x046d, 0x08c2) }, 9, 1,
1315 UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX |
1316 UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_SET_CUR |
1317 UVC_CTRL_FLAG_AUTO_UPDATE },
1318 { { USB_DEVICE(0x046d, 0x08cc) }, 9, 1,
1319 UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX |
1320 UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_SET_CUR |
1321 UVC_CTRL_FLAG_AUTO_UPDATE },
1322 { { USB_DEVICE(0x046d, 0x0994) }, 9, 1,
1323 UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX |
1324 UVC_CTRL_FLAG_GET_DEF | UVC_CTRL_FLAG_SET_CUR |
1325 UVC_CTRL_FLAG_AUTO_UPDATE },
1326 };
1327
1328 unsigned int i;
1329
1330 for (i = 0; i < ARRAY_SIZE(fixups); ++i) {
1331 if (!usb_match_one_id(dev->intf, &fixups[i].id))
1332 continue;
1333
1334 if (fixups[i].entity == ctrl->entity->id &&
1335 fixups[i].selector == info->selector) {
1336 info->flags = fixups[i].flags;
1337 return;
1338 }
1339 }
1340 }
1341
1342 /*
1343 * Query control information (size and flags) for XU controls.
1344 */
1345 static int uvc_ctrl_fill_xu_info(struct uvc_device *dev,
1346 const struct uvc_control *ctrl, struct uvc_control_info *info)
1347 {
1348 u8 *data;
1349 int ret;
1350
1351 data = kmalloc(2, GFP_KERNEL);
1352 if (data == NULL)
1353 return -ENOMEM;
1354
1355 memcpy(info->entity, ctrl->entity->extension.guidExtensionCode,
1356 sizeof(info->entity));
1357 info->index = ctrl->index;
1358 info->selector = ctrl->index + 1;
1359
1360 /* Query and verify the control length (GET_LEN) */
1361 ret = uvc_query_ctrl(dev, UVC_GET_LEN, ctrl->entity->id, dev->intfnum,
1362 info->selector, data, 2);
1363 if (ret < 0) {
1364 uvc_trace(UVC_TRACE_CONTROL,
1365 "GET_LEN failed on control %pUl/%u (%d).\n",
1366 info->entity, info->selector, ret);
1367 goto done;
1368 }
1369
1370 info->size = le16_to_cpup((__le16 *)data);
1371
1372 /* Query the control information (GET_INFO) */
1373 ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
1374 info->selector, data, 1);
1375 if (ret < 0) {
1376 uvc_trace(UVC_TRACE_CONTROL,
1377 "GET_INFO failed on control %pUl/%u (%d).\n",
1378 info->entity, info->selector, ret);
1379 goto done;
1380 }
1381
1382 info->flags = UVC_CTRL_FLAG_GET_MIN | UVC_CTRL_FLAG_GET_MAX
1383 | UVC_CTRL_FLAG_GET_RES | UVC_CTRL_FLAG_GET_DEF
1384 | (data[0] & UVC_CONTROL_CAP_GET ?
1385 UVC_CTRL_FLAG_GET_CUR : 0)
1386 | (data[0] & UVC_CONTROL_CAP_SET ?
1387 UVC_CTRL_FLAG_SET_CUR : 0)
1388 | (data[0] & UVC_CONTROL_CAP_AUTOUPDATE ?
1389 UVC_CTRL_FLAG_AUTO_UPDATE : 0);
1390
1391 uvc_ctrl_fixup_xu_info(dev, ctrl, info);
1392
1393 uvc_trace(UVC_TRACE_CONTROL, "XU control %pUl/%u queried: len %u, "
1394 "flags { get %u set %u auto %u }.\n",
1395 info->entity, info->selector, info->size,
1396 (info->flags & UVC_CTRL_FLAG_GET_CUR) ? 1 : 0,
1397 (info->flags & UVC_CTRL_FLAG_SET_CUR) ? 1 : 0,
1398 (info->flags & UVC_CTRL_FLAG_AUTO_UPDATE) ? 1 : 0);
1399
1400 done:
1401 kfree(data);
1402 return ret;
1403 }
1404
1405 static int uvc_ctrl_add_info(struct uvc_device *dev, struct uvc_control *ctrl,
1406 const struct uvc_control_info *info);
1407
1408 static int uvc_ctrl_init_xu_ctrl(struct uvc_device *dev,
1409 struct uvc_control *ctrl)
1410 {
1411 struct uvc_control_info info;
1412 int ret;
1413
1414 if (ctrl->initialized)
1415 return 0;
1416
1417 ret = uvc_ctrl_fill_xu_info(dev, ctrl, &info);
1418 if (ret < 0)
1419 return ret;
1420
1421 ret = uvc_ctrl_add_info(dev, ctrl, &info);
1422 if (ret < 0)
1423 uvc_trace(UVC_TRACE_CONTROL, "Failed to initialize control "
1424 "%pUl/%u on device %s entity %u\n", info.entity,
1425 info.selector, dev->udev->devpath, ctrl->entity->id);
1426
1427 return ret;
1428 }
1429
1430 int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
1431 struct uvc_xu_control_query *xqry)
1432 {
1433 struct uvc_entity *entity;
1434 struct uvc_control *ctrl;
1435 unsigned int i, found = 0;
1436 __u32 reqflags;
1437 __u16 size;
1438 __u8 *data = NULL;
1439 int ret;
1440
1441 /* Find the extension unit. */
1442 list_for_each_entry(entity, &chain->entities, chain) {
1443 if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT &&
1444 entity->id == xqry->unit)
1445 break;
1446 }
1447
1448 if (entity->id != xqry->unit) {
1449 uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n",
1450 xqry->unit);
1451 return -ENOENT;
1452 }
1453
1454 /* Find the control and perform delayed initialization if needed. */
1455 for (i = 0; i < entity->ncontrols; ++i) {
1456 ctrl = &entity->controls[i];
1457 if (ctrl->index == xqry->selector - 1) {
1458 found = 1;
1459 break;
1460 }
1461 }
1462
1463 if (!found) {
1464 uvc_trace(UVC_TRACE_CONTROL, "Control %pUl/%u not found.\n",
1465 entity->extension.guidExtensionCode, xqry->selector);
1466 return -ENOENT;
1467 }
1468
1469 if (mutex_lock_interruptible(&chain->ctrl_mutex))
1470 return -ERESTARTSYS;
1471
1472 ret = uvc_ctrl_init_xu_ctrl(chain->dev, ctrl);
1473 if (ret < 0) {
1474 ret = -ENOENT;
1475 goto done;
1476 }
1477
1478 /* Validate the required buffer size and flags for the request */
1479 reqflags = 0;
1480 size = ctrl->info.size;
1481
1482 switch (xqry->query) {
1483 case UVC_GET_CUR:
1484 reqflags = UVC_CTRL_FLAG_GET_CUR;
1485 break;
1486 case UVC_GET_MIN:
1487 reqflags = UVC_CTRL_FLAG_GET_MIN;
1488 break;
1489 case UVC_GET_MAX:
1490 reqflags = UVC_CTRL_FLAG_GET_MAX;
1491 break;
1492 case UVC_GET_DEF:
1493 reqflags = UVC_CTRL_FLAG_GET_DEF;
1494 break;
1495 case UVC_GET_RES:
1496 reqflags = UVC_CTRL_FLAG_GET_RES;
1497 break;
1498 case UVC_SET_CUR:
1499 reqflags = UVC_CTRL_FLAG_SET_CUR;
1500 break;
1501 case UVC_GET_LEN:
1502 size = 2;
1503 break;
1504 case UVC_GET_INFO:
1505 size = 1;
1506 break;
1507 default:
1508 ret = -EINVAL;
1509 goto done;
1510 }
1511
1512 if (size != xqry->size) {
1513 ret = -ENOBUFS;
1514 goto done;
1515 }
1516
1517 if (reqflags && !(ctrl->info.flags & reqflags)) {
1518 ret = -EBADRQC;
1519 goto done;
1520 }
1521
1522 data = kmalloc(size, GFP_KERNEL);
1523 if (data == NULL) {
1524 ret = -ENOMEM;
1525 goto done;
1526 }
1527
1528 if (xqry->query == UVC_SET_CUR &&
1529 copy_from_user(data, xqry->data, size)) {
1530 ret = -EFAULT;
1531 goto done;
1532 }
1533
1534 ret = uvc_query_ctrl(chain->dev, xqry->query, xqry->unit,
1535 chain->dev->intfnum, xqry->selector, data, size);
1536 if (ret < 0)
1537 goto done;
1538
1539 if (xqry->query != UVC_SET_CUR &&
1540 copy_to_user(xqry->data, data, size))
1541 ret = -EFAULT;
1542 done:
1543 kfree(data);
1544 mutex_unlock(&chain->ctrl_mutex);
1545 return ret;
1546 }
1547
1548 /* --------------------------------------------------------------------------
1549 * Suspend/resume
1550 */
1551
1552 /*
1553 * Restore control values after resume, skipping controls that haven't been
1554 * changed.
1555 *
1556 * TODO
1557 * - Don't restore modified controls that are back to their default value.
1558 * - Handle restore order (Auto-Exposure Mode should be restored before
1559 * Exposure Time).
1560 */
1561 int uvc_ctrl_resume_device(struct uvc_device *dev)
1562 {
1563 struct uvc_control *ctrl;
1564 struct uvc_entity *entity;
1565 unsigned int i;
1566 int ret;
1567
1568 /* Walk the entities list and restore controls when possible. */
1569 list_for_each_entry(entity, &dev->entities, list) {
1570
1571 for (i = 0; i < entity->ncontrols; ++i) {
1572 ctrl = &entity->controls[i];
1573
1574 if (!ctrl->initialized || !ctrl->modified ||
1575 (ctrl->info.flags & UVC_CTRL_FLAG_RESTORE) == 0)
1576 continue;
1577
1578 printk(KERN_INFO "restoring control %pUl/%u/%u\n",
1579 ctrl->info.entity, ctrl->info.index,
1580 ctrl->info.selector);
1581 ctrl->dirty = 1;
1582 }
1583
1584 ret = uvc_ctrl_commit_entity(dev, entity, 0);
1585 if (ret < 0)
1586 return ret;
1587 }
1588
1589 return 0;
1590 }
1591
1592 /* --------------------------------------------------------------------------
1593 * Control and mapping handling
1594 */
1595
1596 /*
1597 * Add control information to a given control.
1598 */
1599 static int uvc_ctrl_add_info(struct uvc_device *dev, struct uvc_control *ctrl,
1600 const struct uvc_control_info *info)
1601 {
1602 int ret = 0;
1603
1604 memcpy(&ctrl->info, info, sizeof(*info));
1605 INIT_LIST_HEAD(&ctrl->info.mappings);
1606
1607 /* Allocate an array to save control values (cur, def, max, etc.) */
1608 ctrl->uvc_data = kzalloc(ctrl->info.size * UVC_CTRL_DATA_LAST + 1,
1609 GFP_KERNEL);
1610 if (ctrl->uvc_data == NULL) {
1611 ret = -ENOMEM;
1612 goto done;
1613 }
1614
1615 ctrl->initialized = 1;
1616
1617 uvc_trace(UVC_TRACE_CONTROL, "Added control %pUl/%u to device %s "
1618 "entity %u\n", ctrl->info.entity, ctrl->info.selector,
1619 dev->udev->devpath, ctrl->entity->id);
1620
1621 done:
1622 if (ret < 0)
1623 kfree(ctrl->uvc_data);
1624 return ret;
1625 }
1626
1627 /*
1628 * Add a control mapping to a given control.
1629 */
1630 static int __uvc_ctrl_add_mapping(struct uvc_device *dev,
1631 struct uvc_control *ctrl, const struct uvc_control_mapping *mapping)
1632 {
1633 struct uvc_control_mapping *map;
1634 unsigned int size;
1635
1636 /* Most mappings come from static kernel data and need to be duplicated.
1637 * Mappings that come from userspace will be unnecessarily duplicated,
1638 * this could be optimized.
1639 */
1640 map = kmemdup(mapping, sizeof(*mapping), GFP_KERNEL);
1641 if (map == NULL)
1642 return -ENOMEM;
1643
1644 size = sizeof(*mapping->menu_info) * mapping->menu_count;
1645 map->menu_info = kmemdup(mapping->menu_info, size, GFP_KERNEL);
1646 if (map->menu_info == NULL) {
1647 kfree(map);
1648 return -ENOMEM;
1649 }
1650
1651 if (map->get == NULL)
1652 map->get = uvc_get_le_value;
1653 if (map->set == NULL)
1654 map->set = uvc_set_le_value;
1655
1656 map->ctrl = &ctrl->info;
1657 list_add_tail(&map->list, &ctrl->info.mappings);
1658 uvc_trace(UVC_TRACE_CONTROL,
1659 "Adding mapping '%s' to control %pUl/%u.\n",
1660 map->name, ctrl->info.entity, ctrl->info.selector);
1661
1662 return 0;
1663 }
1664
1665 int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
1666 const struct uvc_control_mapping *mapping)
1667 {
1668 struct uvc_device *dev = chain->dev;
1669 struct uvc_control_mapping *map;
1670 struct uvc_entity *entity;
1671 struct uvc_control *ctrl;
1672 int found = 0;
1673 int ret;
1674
1675 if (mapping->id & ~V4L2_CTRL_ID_MASK) {
1676 uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s', control "
1677 "id 0x%08x is invalid.\n", mapping->name,
1678 mapping->id);
1679 return -EINVAL;
1680 }
1681
1682 /* Search for the matching (GUID/CS) control on the current chain */
1683 list_for_each_entry(entity, &chain->entities, chain) {
1684 unsigned int i;
1685
1686 if (UVC_ENTITY_TYPE(entity) != UVC_VC_EXTENSION_UNIT ||
1687 !uvc_entity_match_guid(entity, mapping->entity))
1688 continue;
1689
1690 for (i = 0; i < entity->ncontrols; ++i) {
1691 ctrl = &entity->controls[i];
1692 if (ctrl->index == mapping->selector - 1) {
1693 found = 1;
1694 break;
1695 }
1696 }
1697
1698 if (found)
1699 break;
1700 }
1701 if (!found)
1702 return -ENOENT;
1703
1704 if (mutex_lock_interruptible(&chain->ctrl_mutex))
1705 return -ERESTARTSYS;
1706
1707 /* Perform delayed initialization of XU controls */
1708 ret = uvc_ctrl_init_xu_ctrl(dev, ctrl);
1709 if (ret < 0) {
1710 ret = -ENOENT;
1711 goto done;
1712 }
1713
1714 list_for_each_entry(map, &ctrl->info.mappings, list) {
1715 if (mapping->id == map->id) {
1716 uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s', "
1717 "control id 0x%08x already exists.\n",
1718 mapping->name, mapping->id);
1719 ret = -EEXIST;
1720 goto done;
1721 }
1722 }
1723
1724 /* Prevent excess memory consumption */
1725 if (atomic_inc_return(&dev->nmappings) > UVC_MAX_CONTROL_MAPPINGS) {
1726 atomic_dec(&dev->nmappings);
1727 uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s', maximum "
1728 "mappings count (%u) exceeded.\n", mapping->name,
1729 UVC_MAX_CONTROL_MAPPINGS);
1730 ret = -ENOMEM;
1731 goto done;
1732 }
1733
1734 ret = __uvc_ctrl_add_mapping(dev, ctrl, mapping);
1735 if (ret < 0)
1736 atomic_dec(&dev->nmappings);
1737
1738 done:
1739 mutex_unlock(&chain->ctrl_mutex);
1740 return ret;
1741 }
1742
1743 /*
1744 * Prune an entity of its bogus controls using a blacklist. Bogus controls
1745 * are currently the ones that crash the camera or unconditionally return an
1746 * error when queried.
1747 */
1748 static void uvc_ctrl_prune_entity(struct uvc_device *dev,
1749 struct uvc_entity *entity)
1750 {
1751 struct uvc_ctrl_blacklist {
1752 struct usb_device_id id;
1753 u8 index;
1754 };
1755
1756 static const struct uvc_ctrl_blacklist processing_blacklist[] = {
1757 { { USB_DEVICE(0x13d3, 0x509b) }, 9 }, /* Gain */
1758 { { USB_DEVICE(0x1c4f, 0x3000) }, 6 }, /* WB Temperature */
1759 { { USB_DEVICE(0x5986, 0x0241) }, 2 }, /* Hue */
1760 };
1761 static const struct uvc_ctrl_blacklist camera_blacklist[] = {
1762 { { USB_DEVICE(0x06f8, 0x3005) }, 9 }, /* Zoom, Absolute */
1763 };
1764
1765 const struct uvc_ctrl_blacklist *blacklist;
1766 unsigned int size;
1767 unsigned int count;
1768 unsigned int i;
1769 u8 *controls;
1770
1771 switch (UVC_ENTITY_TYPE(entity)) {
1772 case UVC_VC_PROCESSING_UNIT:
1773 blacklist = processing_blacklist;
1774 count = ARRAY_SIZE(processing_blacklist);
1775 controls = entity->processing.bmControls;
1776 size = entity->processing.bControlSize;
1777 break;
1778
1779 case UVC_ITT_CAMERA:
1780 blacklist = camera_blacklist;
1781 count = ARRAY_SIZE(camera_blacklist);
1782 controls = entity->camera.bmControls;
1783 size = entity->camera.bControlSize;
1784 break;
1785
1786 default:
1787 return;
1788 }
1789
1790 for (i = 0; i < count; ++i) {
1791 if (!usb_match_one_id(dev->intf, &blacklist[i].id))
1792 continue;
1793
1794 if (blacklist[i].index >= 8 * size ||
1795 !uvc_test_bit(controls, blacklist[i].index))
1796 continue;
1797
1798 uvc_trace(UVC_TRACE_CONTROL, "%u/%u control is black listed, "
1799 "removing it.\n", entity->id, blacklist[i].index);
1800
1801 uvc_clear_bit(controls, blacklist[i].index);
1802 }
1803 }
1804
1805 /*
1806 * Add control information and hardcoded stock control mappings to the given
1807 * device.
1808 */
1809 static void uvc_ctrl_init_ctrl(struct uvc_device *dev, struct uvc_control *ctrl)
1810 {
1811 const struct uvc_control_info *info = uvc_ctrls;
1812 const struct uvc_control_info *iend = info + ARRAY_SIZE(uvc_ctrls);
1813 const struct uvc_control_mapping *mapping = uvc_ctrl_mappings;
1814 const struct uvc_control_mapping *mend =
1815 mapping + ARRAY_SIZE(uvc_ctrl_mappings);
1816
1817 /* XU controls initialization requires querying the device for control
1818 * information. As some buggy UVC devices will crash when queried
1819 * repeatedly in a tight loop, delay XU controls initialization until
1820 * first use.
1821 */
1822 if (UVC_ENTITY_TYPE(ctrl->entity) == UVC_VC_EXTENSION_UNIT)
1823 return;
1824
1825 for (; info < iend; ++info) {
1826 if (uvc_entity_match_guid(ctrl->entity, info->entity) &&
1827 ctrl->index == info->index) {
1828 uvc_ctrl_add_info(dev, ctrl, info);
1829 break;
1830 }
1831 }
1832
1833 if (!ctrl->initialized)
1834 return;
1835
1836 for (; mapping < mend; ++mapping) {
1837 if (uvc_entity_match_guid(ctrl->entity, mapping->entity) &&
1838 ctrl->info.selector == mapping->selector)
1839 __uvc_ctrl_add_mapping(dev, ctrl, mapping);
1840 }
1841 }
1842
1843 /*
1844 * Initialize device controls.
1845 */
1846 int uvc_ctrl_init_device(struct uvc_device *dev)
1847 {
1848 struct uvc_entity *entity;
1849 unsigned int i;
1850
1851 /* Walk the entities list and instantiate controls */
1852 list_for_each_entry(entity, &dev->entities, list) {
1853 struct uvc_control *ctrl;
1854 unsigned int bControlSize = 0, ncontrols = 0;
1855 __u8 *bmControls = NULL;
1856
1857 if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT) {
1858 bmControls = entity->extension.bmControls;
1859 bControlSize = entity->extension.bControlSize;
1860 } else if (UVC_ENTITY_TYPE(entity) == UVC_VC_PROCESSING_UNIT) {
1861 bmControls = entity->processing.bmControls;
1862 bControlSize = entity->processing.bControlSize;
1863 } else if (UVC_ENTITY_TYPE(entity) == UVC_ITT_CAMERA) {
1864 bmControls = entity->camera.bmControls;
1865 bControlSize = entity->camera.bControlSize;
1866 }
1867
1868 /* Remove bogus/blacklisted controls */
1869 uvc_ctrl_prune_entity(dev, entity);
1870
1871 /* Count supported controls and allocate the controls array */
1872 for (i = 0; i < bControlSize; ++i)
1873 ncontrols += hweight8(bmControls[i]);
1874 if (ncontrols == 0)
1875 continue;
1876
1877 entity->controls = kcalloc(ncontrols, sizeof(*ctrl),
1878 GFP_KERNEL);
1879 if (entity->controls == NULL)
1880 return -ENOMEM;
1881 entity->ncontrols = ncontrols;
1882
1883 /* Initialize all supported controls */
1884 ctrl = entity->controls;
1885 for (i = 0; i < bControlSize * 8; ++i) {
1886 if (uvc_test_bit(bmControls, i) == 0)
1887 continue;
1888
1889 ctrl->entity = entity;
1890 ctrl->index = i;
1891
1892 uvc_ctrl_init_ctrl(dev, ctrl);
1893 ctrl++;
1894 }
1895 }
1896
1897 return 0;
1898 }
1899
1900 /*
1901 * Cleanup device controls.
1902 */
1903 static void uvc_ctrl_cleanup_mappings(struct uvc_device *dev,
1904 struct uvc_control *ctrl)
1905 {
1906 struct uvc_control_mapping *mapping, *nm;
1907
1908 list_for_each_entry_safe(mapping, nm, &ctrl->info.mappings, list) {
1909 list_del(&mapping->list);
1910 kfree(mapping->menu_info);
1911 kfree(mapping);
1912 }
1913 }
1914
1915 void uvc_ctrl_cleanup_device(struct uvc_device *dev)
1916 {
1917 struct uvc_entity *entity;
1918 unsigned int i;
1919
1920 /* Free controls and control mappings for all entities. */
1921 list_for_each_entry(entity, &dev->entities, list) {
1922 for (i = 0; i < entity->ncontrols; ++i) {
1923 struct uvc_control *ctrl = &entity->controls[i];
1924
1925 if (!ctrl->initialized)
1926 continue;
1927
1928 uvc_ctrl_cleanup_mappings(dev, ctrl);
1929 kfree(ctrl->uvc_data);
1930 }
1931
1932 kfree(entity->controls);
1933 }
1934 }