Commit | Line | Data |
---|---|---|
0996517c HV |
1 | /* |
2 | V4L2 controls framework implementation. | |
3 | ||
4 | Copyright (C) 2010 Hans Verkuil <hverkuil@xs4all.nl> | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
21 | #include <linux/ctype.h> | |
2b80163c | 22 | #include <linux/slab.h> |
0996517c HV |
23 | #include <media/v4l2-ioctl.h> |
24 | #include <media/v4l2-device.h> | |
25 | #include <media/v4l2-ctrls.h> | |
6e239399 | 26 | #include <media/v4l2-event.h> |
0996517c HV |
27 | #include <media/v4l2-dev.h> |
28 | ||
ddac5c10 HV |
29 | #define has_op(master, op) \ |
30 | (master->ops && master->ops->op) | |
54c911eb | 31 | #define call_op(master, op) \ |
ddac5c10 | 32 | (has_op(master, op) ? master->ops->op(master) : 0) |
54c911eb | 33 | |
0996517c HV |
34 | /* Internal temporary helper struct, one for each v4l2_ext_control */ |
35 | struct ctrl_helper { | |
36 | /* The control corresponding to the v4l2_ext_control ID field. */ | |
37 | struct v4l2_ctrl *ctrl; | |
38 | /* Used internally to mark whether this control was already | |
39 | processed. */ | |
40 | bool handled; | |
41 | }; | |
42 | ||
72d877ca HV |
43 | /* Small helper function to determine if the autocluster is set to manual |
44 | mode. In that case the is_volatile flag should be ignored. */ | |
45 | static bool is_cur_manual(const struct v4l2_ctrl *master) | |
46 | { | |
47 | return master->is_auto && master->cur.val == master->manual_mode_value; | |
48 | } | |
49 | ||
50 | /* Same as above, but this checks the against the new value instead of the | |
51 | current value. */ | |
52 | static bool is_new_manual(const struct v4l2_ctrl *master) | |
53 | { | |
54 | return master->is_auto && master->val == master->manual_mode_value; | |
55 | } | |
56 | ||
0996517c HV |
57 | /* Returns NULL or a character pointer array containing the menu for |
58 | the given control ID. The pointer array ends with a NULL pointer. | |
59 | An empty string signifies a menu entry that is invalid. This allows | |
60 | drivers to disable certain options if it is not supported. */ | |
513521ea | 61 | const char * const *v4l2_ctrl_get_menu(u32 id) |
0996517c | 62 | { |
513521ea | 63 | static const char * const mpeg_audio_sampling_freq[] = { |
0996517c HV |
64 | "44.1 kHz", |
65 | "48 kHz", | |
66 | "32 kHz", | |
67 | NULL | |
68 | }; | |
513521ea | 69 | static const char * const mpeg_audio_encoding[] = { |
0996517c HV |
70 | "MPEG-1/2 Layer I", |
71 | "MPEG-1/2 Layer II", | |
72 | "MPEG-1/2 Layer III", | |
73 | "MPEG-2/4 AAC", | |
74 | "AC-3", | |
75 | NULL | |
76 | }; | |
513521ea | 77 | static const char * const mpeg_audio_l1_bitrate[] = { |
0996517c HV |
78 | "32 kbps", |
79 | "64 kbps", | |
80 | "96 kbps", | |
81 | "128 kbps", | |
82 | "160 kbps", | |
83 | "192 kbps", | |
84 | "224 kbps", | |
85 | "256 kbps", | |
86 | "288 kbps", | |
87 | "320 kbps", | |
88 | "352 kbps", | |
89 | "384 kbps", | |
90 | "416 kbps", | |
91 | "448 kbps", | |
92 | NULL | |
93 | }; | |
513521ea | 94 | static const char * const mpeg_audio_l2_bitrate[] = { |
0996517c HV |
95 | "32 kbps", |
96 | "48 kbps", | |
97 | "56 kbps", | |
98 | "64 kbps", | |
99 | "80 kbps", | |
100 | "96 kbps", | |
101 | "112 kbps", | |
102 | "128 kbps", | |
103 | "160 kbps", | |
104 | "192 kbps", | |
105 | "224 kbps", | |
106 | "256 kbps", | |
107 | "320 kbps", | |
108 | "384 kbps", | |
109 | NULL | |
110 | }; | |
513521ea | 111 | static const char * const mpeg_audio_l3_bitrate[] = { |
0996517c HV |
112 | "32 kbps", |
113 | "40 kbps", | |
114 | "48 kbps", | |
115 | "56 kbps", | |
116 | "64 kbps", | |
117 | "80 kbps", | |
118 | "96 kbps", | |
119 | "112 kbps", | |
120 | "128 kbps", | |
121 | "160 kbps", | |
122 | "192 kbps", | |
123 | "224 kbps", | |
124 | "256 kbps", | |
125 | "320 kbps", | |
126 | NULL | |
127 | }; | |
513521ea | 128 | static const char * const mpeg_audio_ac3_bitrate[] = { |
0996517c HV |
129 | "32 kbps", |
130 | "40 kbps", | |
131 | "48 kbps", | |
132 | "56 kbps", | |
133 | "64 kbps", | |
134 | "80 kbps", | |
135 | "96 kbps", | |
136 | "112 kbps", | |
137 | "128 kbps", | |
138 | "160 kbps", | |
139 | "192 kbps", | |
140 | "224 kbps", | |
141 | "256 kbps", | |
142 | "320 kbps", | |
143 | "384 kbps", | |
144 | "448 kbps", | |
145 | "512 kbps", | |
146 | "576 kbps", | |
147 | "640 kbps", | |
148 | NULL | |
149 | }; | |
513521ea | 150 | static const char * const mpeg_audio_mode[] = { |
0996517c HV |
151 | "Stereo", |
152 | "Joint Stereo", | |
153 | "Dual", | |
154 | "Mono", | |
155 | NULL | |
156 | }; | |
513521ea | 157 | static const char * const mpeg_audio_mode_extension[] = { |
0996517c HV |
158 | "Bound 4", |
159 | "Bound 8", | |
160 | "Bound 12", | |
161 | "Bound 16", | |
162 | NULL | |
163 | }; | |
513521ea | 164 | static const char * const mpeg_audio_emphasis[] = { |
0996517c HV |
165 | "No Emphasis", |
166 | "50/15 us", | |
167 | "CCITT J17", | |
168 | NULL | |
169 | }; | |
513521ea | 170 | static const char * const mpeg_audio_crc[] = { |
0996517c HV |
171 | "No CRC", |
172 | "16-bit CRC", | |
173 | NULL | |
174 | }; | |
513521ea | 175 | static const char * const mpeg_video_encoding[] = { |
0996517c HV |
176 | "MPEG-1", |
177 | "MPEG-2", | |
178 | "MPEG-4 AVC", | |
179 | NULL | |
180 | }; | |
513521ea | 181 | static const char * const mpeg_video_aspect[] = { |
0996517c HV |
182 | "1x1", |
183 | "4x3", | |
184 | "16x9", | |
185 | "2.21x1", | |
186 | NULL | |
187 | }; | |
513521ea | 188 | static const char * const mpeg_video_bitrate_mode[] = { |
0996517c HV |
189 | "Variable Bitrate", |
190 | "Constant Bitrate", | |
191 | NULL | |
192 | }; | |
513521ea | 193 | static const char * const mpeg_stream_type[] = { |
0996517c HV |
194 | "MPEG-2 Program Stream", |
195 | "MPEG-2 Transport Stream", | |
196 | "MPEG-1 System Stream", | |
197 | "MPEG-2 DVD-compatible Stream", | |
198 | "MPEG-1 VCD-compatible Stream", | |
199 | "MPEG-2 SVCD-compatible Stream", | |
200 | NULL | |
201 | }; | |
513521ea | 202 | static const char * const mpeg_stream_vbi_fmt[] = { |
0996517c HV |
203 | "No VBI", |
204 | "Private packet, IVTV format", | |
205 | NULL | |
206 | }; | |
513521ea | 207 | static const char * const camera_power_line_frequency[] = { |
0996517c HV |
208 | "Disabled", |
209 | "50 Hz", | |
210 | "60 Hz", | |
211 | NULL | |
212 | }; | |
513521ea | 213 | static const char * const camera_exposure_auto[] = { |
0996517c HV |
214 | "Auto Mode", |
215 | "Manual Mode", | |
216 | "Shutter Priority Mode", | |
217 | "Aperture Priority Mode", | |
218 | NULL | |
219 | }; | |
513521ea | 220 | static const char * const colorfx[] = { |
0996517c HV |
221 | "None", |
222 | "Black & White", | |
223 | "Sepia", | |
224 | "Negative", | |
225 | "Emboss", | |
226 | "Sketch", | |
227 | "Sky blue", | |
228 | "Grass green", | |
229 | "Skin whiten", | |
230 | "Vivid", | |
231 | NULL | |
232 | }; | |
513521ea | 233 | static const char * const tune_preemphasis[] = { |
0996517c HV |
234 | "No preemphasis", |
235 | "50 useconds", | |
236 | "75 useconds", | |
237 | NULL, | |
238 | }; | |
239 | ||
240 | switch (id) { | |
241 | case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: | |
242 | return mpeg_audio_sampling_freq; | |
243 | case V4L2_CID_MPEG_AUDIO_ENCODING: | |
244 | return mpeg_audio_encoding; | |
245 | case V4L2_CID_MPEG_AUDIO_L1_BITRATE: | |
246 | return mpeg_audio_l1_bitrate; | |
247 | case V4L2_CID_MPEG_AUDIO_L2_BITRATE: | |
248 | return mpeg_audio_l2_bitrate; | |
249 | case V4L2_CID_MPEG_AUDIO_L3_BITRATE: | |
250 | return mpeg_audio_l3_bitrate; | |
251 | case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: | |
252 | return mpeg_audio_ac3_bitrate; | |
253 | case V4L2_CID_MPEG_AUDIO_MODE: | |
254 | return mpeg_audio_mode; | |
255 | case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: | |
256 | return mpeg_audio_mode_extension; | |
257 | case V4L2_CID_MPEG_AUDIO_EMPHASIS: | |
258 | return mpeg_audio_emphasis; | |
259 | case V4L2_CID_MPEG_AUDIO_CRC: | |
260 | return mpeg_audio_crc; | |
261 | case V4L2_CID_MPEG_VIDEO_ENCODING: | |
262 | return mpeg_video_encoding; | |
263 | case V4L2_CID_MPEG_VIDEO_ASPECT: | |
264 | return mpeg_video_aspect; | |
265 | case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: | |
266 | return mpeg_video_bitrate_mode; | |
267 | case V4L2_CID_MPEG_STREAM_TYPE: | |
268 | return mpeg_stream_type; | |
269 | case V4L2_CID_MPEG_STREAM_VBI_FMT: | |
270 | return mpeg_stream_vbi_fmt; | |
271 | case V4L2_CID_POWER_LINE_FREQUENCY: | |
272 | return camera_power_line_frequency; | |
273 | case V4L2_CID_EXPOSURE_AUTO: | |
274 | return camera_exposure_auto; | |
275 | case V4L2_CID_COLORFX: | |
276 | return colorfx; | |
277 | case V4L2_CID_TUNE_PREEMPHASIS: | |
278 | return tune_preemphasis; | |
279 | default: | |
280 | return NULL; | |
281 | } | |
282 | } | |
283 | EXPORT_SYMBOL(v4l2_ctrl_get_menu); | |
284 | ||
285 | /* Return the control name. */ | |
286 | const char *v4l2_ctrl_get_name(u32 id) | |
287 | { | |
288 | switch (id) { | |
289 | /* USER controls */ | |
6c8d6111 | 290 | /* Keep the order of the 'case's the same as in videodev2.h! */ |
6dd5aff3 MCC |
291 | case V4L2_CID_USER_CLASS: return "User Controls"; |
292 | case V4L2_CID_BRIGHTNESS: return "Brightness"; | |
293 | case V4L2_CID_CONTRAST: return "Contrast"; | |
294 | case V4L2_CID_SATURATION: return "Saturation"; | |
295 | case V4L2_CID_HUE: return "Hue"; | |
296 | case V4L2_CID_AUDIO_VOLUME: return "Volume"; | |
297 | case V4L2_CID_AUDIO_BALANCE: return "Balance"; | |
298 | case V4L2_CID_AUDIO_BASS: return "Bass"; | |
299 | case V4L2_CID_AUDIO_TREBLE: return "Treble"; | |
300 | case V4L2_CID_AUDIO_MUTE: return "Mute"; | |
301 | case V4L2_CID_AUDIO_LOUDNESS: return "Loudness"; | |
0996517c HV |
302 | case V4L2_CID_BLACK_LEVEL: return "Black Level"; |
303 | case V4L2_CID_AUTO_WHITE_BALANCE: return "White Balance, Automatic"; | |
304 | case V4L2_CID_DO_WHITE_BALANCE: return "Do White Balance"; | |
305 | case V4L2_CID_RED_BALANCE: return "Red Balance"; | |
306 | case V4L2_CID_BLUE_BALANCE: return "Blue Balance"; | |
307 | case V4L2_CID_GAMMA: return "Gamma"; | |
308 | case V4L2_CID_EXPOSURE: return "Exposure"; | |
309 | case V4L2_CID_AUTOGAIN: return "Gain, Automatic"; | |
310 | case V4L2_CID_GAIN: return "Gain"; | |
311 | case V4L2_CID_HFLIP: return "Horizontal Flip"; | |
312 | case V4L2_CID_VFLIP: return "Vertical Flip"; | |
313 | case V4L2_CID_HCENTER: return "Horizontal Center"; | |
314 | case V4L2_CID_VCENTER: return "Vertical Center"; | |
315 | case V4L2_CID_POWER_LINE_FREQUENCY: return "Power Line Frequency"; | |
316 | case V4L2_CID_HUE_AUTO: return "Hue, Automatic"; | |
317 | case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature"; | |
318 | case V4L2_CID_SHARPNESS: return "Sharpness"; | |
319 | case V4L2_CID_BACKLIGHT_COMPENSATION: return "Backlight Compensation"; | |
320 | case V4L2_CID_CHROMA_AGC: return "Chroma AGC"; | |
0996517c HV |
321 | case V4L2_CID_COLOR_KILLER: return "Color Killer"; |
322 | case V4L2_CID_COLORFX: return "Color Effects"; | |
323 | case V4L2_CID_AUTOBRIGHTNESS: return "Brightness, Automatic"; | |
324 | case V4L2_CID_BAND_STOP_FILTER: return "Band-Stop Filter"; | |
325 | case V4L2_CID_ROTATE: return "Rotate"; | |
326 | case V4L2_CID_BG_COLOR: return "Background Color"; | |
6c8d6111 | 327 | case V4L2_CID_CHROMA_GAIN: return "Chroma Gain"; |
008d35f2 JFM |
328 | case V4L2_CID_ILLUMINATORS_1: return "Illuminator 1"; |
329 | case V4L2_CID_ILLUMINATORS_2: return "Illuminator 2"; | |
0996517c HV |
330 | |
331 | /* MPEG controls */ | |
6c8d6111 | 332 | /* Keep the order of the 'case's the same as in videodev2.h! */ |
6dd5aff3 MCC |
333 | case V4L2_CID_MPEG_CLASS: return "MPEG Encoder Controls"; |
334 | case V4L2_CID_MPEG_STREAM_TYPE: return "Stream Type"; | |
335 | case V4L2_CID_MPEG_STREAM_PID_PMT: return "Stream PMT Program ID"; | |
336 | case V4L2_CID_MPEG_STREAM_PID_AUDIO: return "Stream Audio Program ID"; | |
337 | case V4L2_CID_MPEG_STREAM_PID_VIDEO: return "Stream Video Program ID"; | |
338 | case V4L2_CID_MPEG_STREAM_PID_PCR: return "Stream PCR Program ID"; | |
6c8d6111 HV |
339 | case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID"; |
340 | case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID"; | |
341 | case V4L2_CID_MPEG_STREAM_VBI_FMT: return "Stream VBI Format"; | |
0996517c | 342 | case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency"; |
6dd5aff3 MCC |
343 | case V4L2_CID_MPEG_AUDIO_ENCODING: return "Audio Encoding"; |
344 | case V4L2_CID_MPEG_AUDIO_L1_BITRATE: return "Audio Layer I Bitrate"; | |
345 | case V4L2_CID_MPEG_AUDIO_L2_BITRATE: return "Audio Layer II Bitrate"; | |
346 | case V4L2_CID_MPEG_AUDIO_L3_BITRATE: return "Audio Layer III Bitrate"; | |
347 | case V4L2_CID_MPEG_AUDIO_MODE: return "Audio Stereo Mode"; | |
0996517c | 348 | case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension"; |
6dd5aff3 MCC |
349 | case V4L2_CID_MPEG_AUDIO_EMPHASIS: return "Audio Emphasis"; |
350 | case V4L2_CID_MPEG_AUDIO_CRC: return "Audio CRC"; | |
351 | case V4L2_CID_MPEG_AUDIO_MUTE: return "Audio Mute"; | |
352 | case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: return "Audio AAC Bitrate"; | |
353 | case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: return "Audio AC-3 Bitrate"; | |
354 | case V4L2_CID_MPEG_VIDEO_ENCODING: return "Video Encoding"; | |
355 | case V4L2_CID_MPEG_VIDEO_ASPECT: return "Video Aspect"; | |
356 | case V4L2_CID_MPEG_VIDEO_B_FRAMES: return "Video B Frames"; | |
357 | case V4L2_CID_MPEG_VIDEO_GOP_SIZE: return "Video GOP Size"; | |
358 | case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: return "Video GOP Closure"; | |
359 | case V4L2_CID_MPEG_VIDEO_PULLDOWN: return "Video Pulldown"; | |
360 | case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: return "Video Bitrate Mode"; | |
361 | case V4L2_CID_MPEG_VIDEO_BITRATE: return "Video Bitrate"; | |
362 | case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: return "Video Peak Bitrate"; | |
0996517c | 363 | case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation"; |
6dd5aff3 | 364 | case V4L2_CID_MPEG_VIDEO_MUTE: return "Video Mute"; |
0996517c | 365 | case V4L2_CID_MPEG_VIDEO_MUTE_YUV: return "Video Mute YUV"; |
0996517c HV |
366 | |
367 | /* CAMERA controls */ | |
6c8d6111 | 368 | /* Keep the order of the 'case's the same as in videodev2.h! */ |
0996517c HV |
369 | case V4L2_CID_CAMERA_CLASS: return "Camera Controls"; |
370 | case V4L2_CID_EXPOSURE_AUTO: return "Auto Exposure"; | |
371 | case V4L2_CID_EXPOSURE_ABSOLUTE: return "Exposure Time, Absolute"; | |
372 | case V4L2_CID_EXPOSURE_AUTO_PRIORITY: return "Exposure, Dynamic Framerate"; | |
373 | case V4L2_CID_PAN_RELATIVE: return "Pan, Relative"; | |
374 | case V4L2_CID_TILT_RELATIVE: return "Tilt, Relative"; | |
375 | case V4L2_CID_PAN_RESET: return "Pan, Reset"; | |
376 | case V4L2_CID_TILT_RESET: return "Tilt, Reset"; | |
377 | case V4L2_CID_PAN_ABSOLUTE: return "Pan, Absolute"; | |
378 | case V4L2_CID_TILT_ABSOLUTE: return "Tilt, Absolute"; | |
379 | case V4L2_CID_FOCUS_ABSOLUTE: return "Focus, Absolute"; | |
380 | case V4L2_CID_FOCUS_RELATIVE: return "Focus, Relative"; | |
381 | case V4L2_CID_FOCUS_AUTO: return "Focus, Automatic"; | |
0996517c HV |
382 | case V4L2_CID_ZOOM_ABSOLUTE: return "Zoom, Absolute"; |
383 | case V4L2_CID_ZOOM_RELATIVE: return "Zoom, Relative"; | |
384 | case V4L2_CID_ZOOM_CONTINUOUS: return "Zoom, Continuous"; | |
385 | case V4L2_CID_PRIVACY: return "Privacy"; | |
6c8d6111 HV |
386 | case V4L2_CID_IRIS_ABSOLUTE: return "Iris, Absolute"; |
387 | case V4L2_CID_IRIS_RELATIVE: return "Iris, Relative"; | |
0996517c HV |
388 | |
389 | /* FM Radio Modulator control */ | |
6c8d6111 | 390 | /* Keep the order of the 'case's the same as in videodev2.h! */ |
0996517c HV |
391 | case V4L2_CID_FM_TX_CLASS: return "FM Radio Modulator Controls"; |
392 | case V4L2_CID_RDS_TX_DEVIATION: return "RDS Signal Deviation"; | |
393 | case V4L2_CID_RDS_TX_PI: return "RDS Program ID"; | |
394 | case V4L2_CID_RDS_TX_PTY: return "RDS Program Type"; | |
395 | case V4L2_CID_RDS_TX_PS_NAME: return "RDS PS Name"; | |
396 | case V4L2_CID_RDS_TX_RADIO_TEXT: return "RDS Radio Text"; | |
397 | case V4L2_CID_AUDIO_LIMITER_ENABLED: return "Audio Limiter Feature Enabled"; | |
398 | case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time"; | |
399 | case V4L2_CID_AUDIO_LIMITER_DEVIATION: return "Audio Limiter Deviation"; | |
400 | case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Feature Enabled"; | |
401 | case V4L2_CID_AUDIO_COMPRESSION_GAIN: return "Audio Compression Gain"; | |
402 | case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold"; | |
403 | case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time"; | |
404 | case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time"; | |
405 | case V4L2_CID_PILOT_TONE_ENABLED: return "Pilot Tone Feature Enabled"; | |
406 | case V4L2_CID_PILOT_TONE_DEVIATION: return "Pilot Tone Deviation"; | |
407 | case V4L2_CID_PILOT_TONE_FREQUENCY: return "Pilot Tone Frequency"; | |
408 | case V4L2_CID_TUNE_PREEMPHASIS: return "Pre-emphasis settings"; | |
409 | case V4L2_CID_TUNE_POWER_LEVEL: return "Tune Power Level"; | |
410 | case V4L2_CID_TUNE_ANTENNA_CAPACITOR: return "Tune Antenna Capacitor"; | |
411 | ||
412 | default: | |
413 | return NULL; | |
414 | } | |
415 | } | |
416 | EXPORT_SYMBOL(v4l2_ctrl_get_name); | |
417 | ||
418 | void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type, | |
419 | s32 *min, s32 *max, s32 *step, s32 *def, u32 *flags) | |
420 | { | |
421 | *name = v4l2_ctrl_get_name(id); | |
422 | *flags = 0; | |
423 | ||
424 | switch (id) { | |
425 | case V4L2_CID_AUDIO_MUTE: | |
426 | case V4L2_CID_AUDIO_LOUDNESS: | |
427 | case V4L2_CID_AUTO_WHITE_BALANCE: | |
428 | case V4L2_CID_AUTOGAIN: | |
429 | case V4L2_CID_HFLIP: | |
430 | case V4L2_CID_VFLIP: | |
431 | case V4L2_CID_HUE_AUTO: | |
432 | case V4L2_CID_CHROMA_AGC: | |
433 | case V4L2_CID_COLOR_KILLER: | |
434 | case V4L2_CID_MPEG_AUDIO_MUTE: | |
435 | case V4L2_CID_MPEG_VIDEO_MUTE: | |
436 | case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: | |
437 | case V4L2_CID_MPEG_VIDEO_PULLDOWN: | |
438 | case V4L2_CID_EXPOSURE_AUTO_PRIORITY: | |
439 | case V4L2_CID_FOCUS_AUTO: | |
440 | case V4L2_CID_PRIVACY: | |
441 | case V4L2_CID_AUDIO_LIMITER_ENABLED: | |
442 | case V4L2_CID_AUDIO_COMPRESSION_ENABLED: | |
443 | case V4L2_CID_PILOT_TONE_ENABLED: | |
008d35f2 JFM |
444 | case V4L2_CID_ILLUMINATORS_1: |
445 | case V4L2_CID_ILLUMINATORS_2: | |
0996517c HV |
446 | *type = V4L2_CTRL_TYPE_BOOLEAN; |
447 | *min = 0; | |
448 | *max = *step = 1; | |
449 | break; | |
450 | case V4L2_CID_PAN_RESET: | |
451 | case V4L2_CID_TILT_RESET: | |
452 | *type = V4L2_CTRL_TYPE_BUTTON; | |
453 | *flags |= V4L2_CTRL_FLAG_WRITE_ONLY; | |
454 | *min = *max = *step = *def = 0; | |
455 | break; | |
456 | case V4L2_CID_POWER_LINE_FREQUENCY: | |
457 | case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: | |
458 | case V4L2_CID_MPEG_AUDIO_ENCODING: | |
459 | case V4L2_CID_MPEG_AUDIO_L1_BITRATE: | |
460 | case V4L2_CID_MPEG_AUDIO_L2_BITRATE: | |
461 | case V4L2_CID_MPEG_AUDIO_L3_BITRATE: | |
462 | case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: | |
463 | case V4L2_CID_MPEG_AUDIO_MODE: | |
464 | case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: | |
465 | case V4L2_CID_MPEG_AUDIO_EMPHASIS: | |
466 | case V4L2_CID_MPEG_AUDIO_CRC: | |
467 | case V4L2_CID_MPEG_VIDEO_ENCODING: | |
468 | case V4L2_CID_MPEG_VIDEO_ASPECT: | |
469 | case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: | |
470 | case V4L2_CID_MPEG_STREAM_TYPE: | |
471 | case V4L2_CID_MPEG_STREAM_VBI_FMT: | |
472 | case V4L2_CID_EXPOSURE_AUTO: | |
473 | case V4L2_CID_COLORFX: | |
474 | case V4L2_CID_TUNE_PREEMPHASIS: | |
475 | *type = V4L2_CTRL_TYPE_MENU; | |
476 | break; | |
477 | case V4L2_CID_RDS_TX_PS_NAME: | |
478 | case V4L2_CID_RDS_TX_RADIO_TEXT: | |
479 | *type = V4L2_CTRL_TYPE_STRING; | |
480 | break; | |
481 | case V4L2_CID_USER_CLASS: | |
482 | case V4L2_CID_CAMERA_CLASS: | |
483 | case V4L2_CID_MPEG_CLASS: | |
484 | case V4L2_CID_FM_TX_CLASS: | |
485 | *type = V4L2_CTRL_TYPE_CTRL_CLASS; | |
486 | /* You can neither read not write these */ | |
487 | *flags |= V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY; | |
488 | *min = *max = *step = *def = 0; | |
489 | break; | |
490 | case V4L2_CID_BG_COLOR: | |
491 | *type = V4L2_CTRL_TYPE_INTEGER; | |
492 | *step = 1; | |
493 | *min = 0; | |
494 | /* Max is calculated as RGB888 that is 2^24 */ | |
495 | *max = 0xFFFFFF; | |
496 | break; | |
497 | default: | |
498 | *type = V4L2_CTRL_TYPE_INTEGER; | |
499 | break; | |
500 | } | |
501 | switch (id) { | |
502 | case V4L2_CID_MPEG_AUDIO_ENCODING: | |
503 | case V4L2_CID_MPEG_AUDIO_MODE: | |
504 | case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: | |
505 | case V4L2_CID_MPEG_VIDEO_B_FRAMES: | |
506 | case V4L2_CID_MPEG_STREAM_TYPE: | |
507 | *flags |= V4L2_CTRL_FLAG_UPDATE; | |
508 | break; | |
509 | case V4L2_CID_AUDIO_VOLUME: | |
510 | case V4L2_CID_AUDIO_BALANCE: | |
511 | case V4L2_CID_AUDIO_BASS: | |
512 | case V4L2_CID_AUDIO_TREBLE: | |
513 | case V4L2_CID_BRIGHTNESS: | |
514 | case V4L2_CID_CONTRAST: | |
515 | case V4L2_CID_SATURATION: | |
516 | case V4L2_CID_HUE: | |
517 | case V4L2_CID_RED_BALANCE: | |
518 | case V4L2_CID_BLUE_BALANCE: | |
519 | case V4L2_CID_GAMMA: | |
520 | case V4L2_CID_SHARPNESS: | |
521 | case V4L2_CID_CHROMA_GAIN: | |
522 | case V4L2_CID_RDS_TX_DEVIATION: | |
523 | case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: | |
524 | case V4L2_CID_AUDIO_LIMITER_DEVIATION: | |
525 | case V4L2_CID_AUDIO_COMPRESSION_GAIN: | |
526 | case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: | |
527 | case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: | |
528 | case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: | |
529 | case V4L2_CID_PILOT_TONE_DEVIATION: | |
530 | case V4L2_CID_PILOT_TONE_FREQUENCY: | |
531 | case V4L2_CID_TUNE_POWER_LEVEL: | |
532 | case V4L2_CID_TUNE_ANTENNA_CAPACITOR: | |
533 | *flags |= V4L2_CTRL_FLAG_SLIDER; | |
534 | break; | |
535 | case V4L2_CID_PAN_RELATIVE: | |
536 | case V4L2_CID_TILT_RELATIVE: | |
537 | case V4L2_CID_FOCUS_RELATIVE: | |
538 | case V4L2_CID_IRIS_RELATIVE: | |
539 | case V4L2_CID_ZOOM_RELATIVE: | |
540 | *flags |= V4L2_CTRL_FLAG_WRITE_ONLY; | |
541 | break; | |
542 | } | |
543 | } | |
544 | EXPORT_SYMBOL(v4l2_ctrl_fill); | |
545 | ||
546 | /* Helper function to determine whether the control type is compatible with | |
547 | VIDIOC_G/S_CTRL. */ | |
548 | static bool type_is_int(const struct v4l2_ctrl *ctrl) | |
549 | { | |
550 | switch (ctrl->type) { | |
551 | case V4L2_CTRL_TYPE_INTEGER64: | |
552 | case V4L2_CTRL_TYPE_STRING: | |
553 | /* Nope, these need v4l2_ext_control */ | |
554 | return false; | |
555 | default: | |
556 | return true; | |
557 | } | |
558 | } | |
559 | ||
6e239399 HV |
560 | static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes) |
561 | { | |
562 | memset(ev->reserved, 0, sizeof(ev->reserved)); | |
563 | ev->type = V4L2_EVENT_CTRL; | |
564 | ev->id = ctrl->id; | |
565 | ev->u.ctrl.changes = changes; | |
566 | ev->u.ctrl.type = ctrl->type; | |
567 | ev->u.ctrl.flags = ctrl->flags; | |
568 | if (ctrl->type == V4L2_CTRL_TYPE_STRING) | |
569 | ev->u.ctrl.value64 = 0; | |
570 | else | |
571 | ev->u.ctrl.value64 = ctrl->cur.val64; | |
572 | ev->u.ctrl.minimum = ctrl->minimum; | |
573 | ev->u.ctrl.maximum = ctrl->maximum; | |
574 | if (ctrl->type == V4L2_CTRL_TYPE_MENU) | |
575 | ev->u.ctrl.step = 1; | |
576 | else | |
577 | ev->u.ctrl.step = ctrl->step; | |
578 | ev->u.ctrl.default_value = ctrl->default_value; | |
579 | } | |
580 | ||
581 | static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes) | |
582 | { | |
583 | struct v4l2_event ev; | |
77068d36 | 584 | struct v4l2_subscribed_event *sev; |
6e239399 | 585 | |
77068d36 | 586 | if (list_empty(&ctrl->ev_subs)) |
6e239399 HV |
587 | return; |
588 | fill_event(&ev, ctrl, changes); | |
589 | ||
77068d36 HV |
590 | list_for_each_entry(sev, &ctrl->ev_subs, node) |
591 | if (sev->fh && sev->fh != fh) | |
592 | v4l2_event_queue_fh(sev->fh, &ev); | |
6e239399 HV |
593 | } |
594 | ||
0996517c HV |
595 | /* Helper function: copy the current control value back to the caller */ |
596 | static int cur_to_user(struct v4l2_ext_control *c, | |
597 | struct v4l2_ctrl *ctrl) | |
598 | { | |
599 | u32 len; | |
600 | ||
601 | switch (ctrl->type) { | |
602 | case V4L2_CTRL_TYPE_STRING: | |
603 | len = strlen(ctrl->cur.string); | |
604 | if (c->size < len + 1) { | |
605 | c->size = len + 1; | |
606 | return -ENOSPC; | |
607 | } | |
608 | return copy_to_user(c->string, ctrl->cur.string, | |
609 | len + 1) ? -EFAULT : 0; | |
610 | case V4L2_CTRL_TYPE_INTEGER64: | |
611 | c->value64 = ctrl->cur.val64; | |
612 | break; | |
613 | default: | |
614 | c->value = ctrl->cur.val; | |
615 | break; | |
616 | } | |
617 | return 0; | |
618 | } | |
619 | ||
620 | /* Helper function: copy the caller-provider value as the new control value */ | |
621 | static int user_to_new(struct v4l2_ext_control *c, | |
622 | struct v4l2_ctrl *ctrl) | |
623 | { | |
624 | int ret; | |
625 | u32 size; | |
626 | ||
2a863793 | 627 | ctrl->is_new = 1; |
0996517c HV |
628 | switch (ctrl->type) { |
629 | case V4L2_CTRL_TYPE_INTEGER64: | |
630 | ctrl->val64 = c->value64; | |
631 | break; | |
632 | case V4L2_CTRL_TYPE_STRING: | |
633 | size = c->size; | |
634 | if (size == 0) | |
635 | return -ERANGE; | |
636 | if (size > ctrl->maximum + 1) | |
637 | size = ctrl->maximum + 1; | |
638 | ret = copy_from_user(ctrl->string, c->string, size); | |
639 | if (!ret) { | |
640 | char last = ctrl->string[size - 1]; | |
641 | ||
642 | ctrl->string[size - 1] = 0; | |
643 | /* If the string was longer than ctrl->maximum, | |
644 | then return an error. */ | |
645 | if (strlen(ctrl->string) == ctrl->maximum && last) | |
646 | return -ERANGE; | |
647 | } | |
648 | return ret ? -EFAULT : 0; | |
649 | default: | |
650 | ctrl->val = c->value; | |
651 | break; | |
652 | } | |
653 | return 0; | |
654 | } | |
655 | ||
656 | /* Helper function: copy the new control value back to the caller */ | |
657 | static int new_to_user(struct v4l2_ext_control *c, | |
658 | struct v4l2_ctrl *ctrl) | |
659 | { | |
660 | u32 len; | |
661 | ||
662 | switch (ctrl->type) { | |
663 | case V4L2_CTRL_TYPE_STRING: | |
664 | len = strlen(ctrl->string); | |
665 | if (c->size < len + 1) { | |
666 | c->size = ctrl->maximum + 1; | |
667 | return -ENOSPC; | |
668 | } | |
669 | return copy_to_user(c->string, ctrl->string, | |
670 | len + 1) ? -EFAULT : 0; | |
671 | case V4L2_CTRL_TYPE_INTEGER64: | |
672 | c->value64 = ctrl->val64; | |
673 | break; | |
674 | default: | |
675 | c->value = ctrl->val; | |
676 | break; | |
677 | } | |
678 | return 0; | |
679 | } | |
680 | ||
ddac5c10 HV |
681 | static int ctrl_to_user(struct v4l2_ext_control *c, |
682 | struct v4l2_ctrl *ctrl) | |
683 | { | |
684 | if (ctrl->is_volatile) | |
685 | return new_to_user(c, ctrl); | |
686 | return cur_to_user(c, ctrl); | |
687 | } | |
688 | ||
689 | static int ctrl_is_volatile(struct v4l2_ext_control *c, | |
690 | struct v4l2_ctrl *ctrl) | |
691 | { | |
692 | return ctrl->is_volatile; | |
693 | } | |
694 | ||
0996517c | 695 | /* Copy the new value to the current value. */ |
ab892bac HV |
696 | static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, |
697 | bool update_inactive) | |
0996517c | 698 | { |
6e239399 HV |
699 | bool changed = false; |
700 | ||
0996517c HV |
701 | if (ctrl == NULL) |
702 | return; | |
703 | switch (ctrl->type) { | |
6e239399 HV |
704 | case V4L2_CTRL_TYPE_BUTTON: |
705 | changed = true; | |
706 | break; | |
0996517c HV |
707 | case V4L2_CTRL_TYPE_STRING: |
708 | /* strings are always 0-terminated */ | |
6e239399 | 709 | changed = strcmp(ctrl->string, ctrl->cur.string); |
0996517c HV |
710 | strcpy(ctrl->cur.string, ctrl->string); |
711 | break; | |
712 | case V4L2_CTRL_TYPE_INTEGER64: | |
6e239399 | 713 | changed = ctrl->val64 != ctrl->cur.val64; |
0996517c HV |
714 | ctrl->cur.val64 = ctrl->val64; |
715 | break; | |
716 | default: | |
6e239399 | 717 | changed = ctrl->val != ctrl->cur.val; |
0996517c HV |
718 | ctrl->cur.val = ctrl->val; |
719 | break; | |
720 | } | |
72d877ca HV |
721 | if (update_inactive) { |
722 | ctrl->flags &= ~V4L2_CTRL_FLAG_INACTIVE; | |
723 | if (!is_cur_manual(ctrl->cluster[0])) | |
724 | ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE; | |
725 | } | |
6e239399 HV |
726 | if (changed || update_inactive) |
727 | send_event(fh, ctrl, | |
728 | (changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) | | |
729 | (update_inactive ? V4L2_EVENT_CTRL_CH_FLAGS : 0)); | |
0996517c HV |
730 | } |
731 | ||
732 | /* Copy the current value to the new value */ | |
733 | static void cur_to_new(struct v4l2_ctrl *ctrl) | |
734 | { | |
735 | if (ctrl == NULL) | |
736 | return; | |
737 | switch (ctrl->type) { | |
738 | case V4L2_CTRL_TYPE_STRING: | |
739 | /* strings are always 0-terminated */ | |
740 | strcpy(ctrl->string, ctrl->cur.string); | |
741 | break; | |
742 | case V4L2_CTRL_TYPE_INTEGER64: | |
743 | ctrl->val64 = ctrl->cur.val64; | |
744 | break; | |
745 | default: | |
746 | ctrl->val = ctrl->cur.val; | |
747 | break; | |
748 | } | |
749 | } | |
750 | ||
751 | /* Return non-zero if one or more of the controls in the cluster has a new | |
752 | value that differs from the current value. */ | |
753 | static int cluster_changed(struct v4l2_ctrl *master) | |
754 | { | |
755 | int diff = 0; | |
756 | int i; | |
757 | ||
758 | for (i = 0; !diff && i < master->ncontrols; i++) { | |
759 | struct v4l2_ctrl *ctrl = master->cluster[i]; | |
760 | ||
761 | if (ctrl == NULL) | |
762 | continue; | |
763 | switch (ctrl->type) { | |
764 | case V4L2_CTRL_TYPE_BUTTON: | |
765 | /* Button controls are always 'different' */ | |
766 | return 1; | |
767 | case V4L2_CTRL_TYPE_STRING: | |
768 | /* strings are always 0-terminated */ | |
769 | diff = strcmp(ctrl->string, ctrl->cur.string); | |
770 | break; | |
771 | case V4L2_CTRL_TYPE_INTEGER64: | |
772 | diff = ctrl->val64 != ctrl->cur.val64; | |
773 | break; | |
774 | default: | |
775 | diff = ctrl->val != ctrl->cur.val; | |
776 | break; | |
777 | } | |
778 | } | |
779 | return diff; | |
780 | } | |
781 | ||
782 | /* Validate a new control */ | |
783 | static int validate_new(struct v4l2_ctrl *ctrl) | |
784 | { | |
785 | s32 val = ctrl->val; | |
786 | char *s = ctrl->string; | |
787 | u32 offset; | |
788 | size_t len; | |
789 | ||
790 | switch (ctrl->type) { | |
791 | case V4L2_CTRL_TYPE_INTEGER: | |
792 | /* Round towards the closest legal value */ | |
793 | val += ctrl->step / 2; | |
794 | if (val < ctrl->minimum) | |
795 | val = ctrl->minimum; | |
796 | if (val > ctrl->maximum) | |
797 | val = ctrl->maximum; | |
798 | offset = val - ctrl->minimum; | |
799 | offset = ctrl->step * (offset / ctrl->step); | |
800 | val = ctrl->minimum + offset; | |
801 | ctrl->val = val; | |
802 | return 0; | |
803 | ||
804 | case V4L2_CTRL_TYPE_BOOLEAN: | |
805 | ctrl->val = !!ctrl->val; | |
806 | return 0; | |
807 | ||
808 | case V4L2_CTRL_TYPE_MENU: | |
809 | if (val < ctrl->minimum || val > ctrl->maximum) | |
810 | return -ERANGE; | |
811 | if (ctrl->qmenu[val][0] == '\0' || | |
812 | (ctrl->menu_skip_mask & (1 << val))) | |
813 | return -EINVAL; | |
814 | return 0; | |
815 | ||
816 | case V4L2_CTRL_TYPE_BUTTON: | |
817 | case V4L2_CTRL_TYPE_CTRL_CLASS: | |
818 | ctrl->val64 = 0; | |
819 | return 0; | |
820 | ||
821 | case V4L2_CTRL_TYPE_INTEGER64: | |
822 | return 0; | |
823 | ||
824 | case V4L2_CTRL_TYPE_STRING: | |
825 | len = strlen(s); | |
826 | if (len < ctrl->minimum) | |
827 | return -ERANGE; | |
828 | if ((len - ctrl->minimum) % ctrl->step) | |
829 | return -ERANGE; | |
830 | return 0; | |
831 | ||
832 | default: | |
833 | return -EINVAL; | |
834 | } | |
835 | } | |
836 | ||
837 | static inline u32 node2id(struct list_head *node) | |
838 | { | |
839 | return list_entry(node, struct v4l2_ctrl_ref, node)->ctrl->id; | |
840 | } | |
841 | ||
842 | /* Set the handler's error code if it wasn't set earlier already */ | |
843 | static inline int handler_set_err(struct v4l2_ctrl_handler *hdl, int err) | |
844 | { | |
845 | if (hdl->error == 0) | |
846 | hdl->error = err; | |
847 | return err; | |
848 | } | |
849 | ||
850 | /* Initialize the handler */ | |
851 | int v4l2_ctrl_handler_init(struct v4l2_ctrl_handler *hdl, | |
852 | unsigned nr_of_controls_hint) | |
853 | { | |
854 | mutex_init(&hdl->lock); | |
855 | INIT_LIST_HEAD(&hdl->ctrls); | |
856 | INIT_LIST_HEAD(&hdl->ctrl_refs); | |
857 | hdl->nr_of_buckets = 1 + nr_of_controls_hint / 8; | |
858 | hdl->buckets = kzalloc(sizeof(hdl->buckets[0]) * hdl->nr_of_buckets, | |
859 | GFP_KERNEL); | |
860 | hdl->error = hdl->buckets ? 0 : -ENOMEM; | |
861 | return hdl->error; | |
862 | } | |
863 | EXPORT_SYMBOL(v4l2_ctrl_handler_init); | |
864 | ||
865 | /* Free all controls and control refs */ | |
866 | void v4l2_ctrl_handler_free(struct v4l2_ctrl_handler *hdl) | |
867 | { | |
868 | struct v4l2_ctrl_ref *ref, *next_ref; | |
869 | struct v4l2_ctrl *ctrl, *next_ctrl; | |
77068d36 | 870 | struct v4l2_subscribed_event *sev, *next_sev; |
0996517c HV |
871 | |
872 | if (hdl == NULL || hdl->buckets == NULL) | |
873 | return; | |
874 | ||
875 | mutex_lock(&hdl->lock); | |
876 | /* Free all nodes */ | |
877 | list_for_each_entry_safe(ref, next_ref, &hdl->ctrl_refs, node) { | |
878 | list_del(&ref->node); | |
879 | kfree(ref); | |
880 | } | |
881 | /* Free all controls owned by the handler */ | |
882 | list_for_each_entry_safe(ctrl, next_ctrl, &hdl->ctrls, node) { | |
883 | list_del(&ctrl->node); | |
77068d36 HV |
884 | list_for_each_entry_safe(sev, next_sev, &ctrl->ev_subs, node) |
885 | list_del(&sev->node); | |
0996517c HV |
886 | kfree(ctrl); |
887 | } | |
888 | kfree(hdl->buckets); | |
889 | hdl->buckets = NULL; | |
890 | hdl->cached = NULL; | |
891 | hdl->error = 0; | |
892 | mutex_unlock(&hdl->lock); | |
893 | } | |
894 | EXPORT_SYMBOL(v4l2_ctrl_handler_free); | |
895 | ||
896 | /* For backwards compatibility: V4L2_CID_PRIVATE_BASE should no longer | |
897 | be used except in G_CTRL, S_CTRL, QUERYCTRL and QUERYMENU when dealing | |
898 | with applications that do not use the NEXT_CTRL flag. | |
899 | ||
900 | We just find the n-th private user control. It's O(N), but that should not | |
901 | be an issue in this particular case. */ | |
902 | static struct v4l2_ctrl_ref *find_private_ref( | |
903 | struct v4l2_ctrl_handler *hdl, u32 id) | |
904 | { | |
905 | struct v4l2_ctrl_ref *ref; | |
906 | ||
907 | id -= V4L2_CID_PRIVATE_BASE; | |
908 | list_for_each_entry(ref, &hdl->ctrl_refs, node) { | |
909 | /* Search for private user controls that are compatible with | |
910 | VIDIOC_G/S_CTRL. */ | |
911 | if (V4L2_CTRL_ID2CLASS(ref->ctrl->id) == V4L2_CTRL_CLASS_USER && | |
912 | V4L2_CTRL_DRIVER_PRIV(ref->ctrl->id)) { | |
913 | if (!type_is_int(ref->ctrl)) | |
914 | continue; | |
915 | if (id == 0) | |
916 | return ref; | |
917 | id--; | |
918 | } | |
919 | } | |
920 | return NULL; | |
921 | } | |
922 | ||
923 | /* Find a control with the given ID. */ | |
924 | static struct v4l2_ctrl_ref *find_ref(struct v4l2_ctrl_handler *hdl, u32 id) | |
925 | { | |
926 | struct v4l2_ctrl_ref *ref; | |
927 | int bucket; | |
928 | ||
929 | id &= V4L2_CTRL_ID_MASK; | |
930 | ||
931 | /* Old-style private controls need special handling */ | |
932 | if (id >= V4L2_CID_PRIVATE_BASE) | |
933 | return find_private_ref(hdl, id); | |
934 | bucket = id % hdl->nr_of_buckets; | |
935 | ||
936 | /* Simple optimization: cache the last control found */ | |
937 | if (hdl->cached && hdl->cached->ctrl->id == id) | |
938 | return hdl->cached; | |
939 | ||
940 | /* Not in cache, search the hash */ | |
941 | ref = hdl->buckets ? hdl->buckets[bucket] : NULL; | |
942 | while (ref && ref->ctrl->id != id) | |
943 | ref = ref->next; | |
944 | ||
945 | if (ref) | |
946 | hdl->cached = ref; /* cache it! */ | |
947 | return ref; | |
948 | } | |
949 | ||
950 | /* Find a control with the given ID. Take the handler's lock first. */ | |
951 | static struct v4l2_ctrl_ref *find_ref_lock( | |
952 | struct v4l2_ctrl_handler *hdl, u32 id) | |
953 | { | |
954 | struct v4l2_ctrl_ref *ref = NULL; | |
955 | ||
956 | if (hdl) { | |
957 | mutex_lock(&hdl->lock); | |
958 | ref = find_ref(hdl, id); | |
959 | mutex_unlock(&hdl->lock); | |
960 | } | |
961 | return ref; | |
962 | } | |
963 | ||
964 | /* Find a control with the given ID. */ | |
965 | struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id) | |
966 | { | |
967 | struct v4l2_ctrl_ref *ref = find_ref_lock(hdl, id); | |
968 | ||
969 | return ref ? ref->ctrl : NULL; | |
970 | } | |
971 | EXPORT_SYMBOL(v4l2_ctrl_find); | |
972 | ||
973 | /* Allocate a new v4l2_ctrl_ref and hook it into the handler. */ | |
974 | static int handler_new_ref(struct v4l2_ctrl_handler *hdl, | |
975 | struct v4l2_ctrl *ctrl) | |
976 | { | |
977 | struct v4l2_ctrl_ref *ref; | |
978 | struct v4l2_ctrl_ref *new_ref; | |
979 | u32 id = ctrl->id; | |
980 | u32 class_ctrl = V4L2_CTRL_ID2CLASS(id) | 1; | |
981 | int bucket = id % hdl->nr_of_buckets; /* which bucket to use */ | |
982 | ||
983 | /* Automatically add the control class if it is not yet present. */ | |
984 | if (id != class_ctrl && find_ref_lock(hdl, class_ctrl) == NULL) | |
985 | if (!v4l2_ctrl_new_std(hdl, NULL, class_ctrl, 0, 0, 0, 0)) | |
986 | return hdl->error; | |
987 | ||
988 | if (hdl->error) | |
989 | return hdl->error; | |
990 | ||
991 | new_ref = kzalloc(sizeof(*new_ref), GFP_KERNEL); | |
992 | if (!new_ref) | |
993 | return handler_set_err(hdl, -ENOMEM); | |
994 | new_ref->ctrl = ctrl; | |
995 | if (ctrl->handler == hdl) { | |
996 | /* By default each control starts in a cluster of its own. | |
997 | new_ref->ctrl is basically a cluster array with one | |
998 | element, so that's perfect to use as the cluster pointer. | |
999 | But only do this for the handler that owns the control. */ | |
1000 | ctrl->cluster = &new_ref->ctrl; | |
1001 | ctrl->ncontrols = 1; | |
1002 | } | |
1003 | ||
1004 | INIT_LIST_HEAD(&new_ref->node); | |
1005 | ||
1006 | mutex_lock(&hdl->lock); | |
1007 | ||
1008 | /* Add immediately at the end of the list if the list is empty, or if | |
1009 | the last element in the list has a lower ID. | |
1010 | This ensures that when elements are added in ascending order the | |
1011 | insertion is an O(1) operation. */ | |
1012 | if (list_empty(&hdl->ctrl_refs) || id > node2id(hdl->ctrl_refs.prev)) { | |
1013 | list_add_tail(&new_ref->node, &hdl->ctrl_refs); | |
1014 | goto insert_in_hash; | |
1015 | } | |
1016 | ||
1017 | /* Find insert position in sorted list */ | |
1018 | list_for_each_entry(ref, &hdl->ctrl_refs, node) { | |
1019 | if (ref->ctrl->id < id) | |
1020 | continue; | |
1021 | /* Don't add duplicates */ | |
1022 | if (ref->ctrl->id == id) { | |
1023 | kfree(new_ref); | |
1024 | goto unlock; | |
1025 | } | |
1026 | list_add(&new_ref->node, ref->node.prev); | |
1027 | break; | |
1028 | } | |
1029 | ||
1030 | insert_in_hash: | |
1031 | /* Insert the control node in the hash */ | |
1032 | new_ref->next = hdl->buckets[bucket]; | |
1033 | hdl->buckets[bucket] = new_ref; | |
1034 | ||
1035 | unlock: | |
1036 | mutex_unlock(&hdl->lock); | |
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | /* Add a new control */ | |
1041 | static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl, | |
1042 | const struct v4l2_ctrl_ops *ops, | |
1043 | u32 id, const char *name, enum v4l2_ctrl_type type, | |
1044 | s32 min, s32 max, u32 step, s32 def, | |
513521ea | 1045 | u32 flags, const char * const *qmenu, void *priv) |
0996517c HV |
1046 | { |
1047 | struct v4l2_ctrl *ctrl; | |
1048 | unsigned sz_extra = 0; | |
1049 | ||
1050 | if (hdl->error) | |
1051 | return NULL; | |
1052 | ||
1053 | /* Sanity checks */ | |
1054 | if (id == 0 || name == NULL || id >= V4L2_CID_PRIVATE_BASE || | |
02ac0480 | 1055 | max < min || |
0996517c HV |
1056 | (type == V4L2_CTRL_TYPE_INTEGER && step == 0) || |
1057 | (type == V4L2_CTRL_TYPE_MENU && qmenu == NULL) || | |
1058 | (type == V4L2_CTRL_TYPE_STRING && max == 0)) { | |
1059 | handler_set_err(hdl, -ERANGE); | |
1060 | return NULL; | |
1061 | } | |
02ac0480 HV |
1062 | if ((type == V4L2_CTRL_TYPE_INTEGER || |
1063 | type == V4L2_CTRL_TYPE_MENU || | |
1064 | type == V4L2_CTRL_TYPE_BOOLEAN) && | |
1065 | (def < min || def > max)) { | |
1066 | handler_set_err(hdl, -ERANGE); | |
1067 | return NULL; | |
1068 | } | |
0996517c HV |
1069 | |
1070 | if (type == V4L2_CTRL_TYPE_BUTTON) | |
1071 | flags |= V4L2_CTRL_FLAG_WRITE_ONLY; | |
1072 | else if (type == V4L2_CTRL_TYPE_CTRL_CLASS) | |
1073 | flags |= V4L2_CTRL_FLAG_READ_ONLY; | |
1074 | else if (type == V4L2_CTRL_TYPE_STRING) | |
1075 | sz_extra += 2 * (max + 1); | |
1076 | ||
1077 | ctrl = kzalloc(sizeof(*ctrl) + sz_extra, GFP_KERNEL); | |
1078 | if (ctrl == NULL) { | |
1079 | handler_set_err(hdl, -ENOMEM); | |
1080 | return NULL; | |
1081 | } | |
1082 | ||
1083 | INIT_LIST_HEAD(&ctrl->node); | |
77068d36 | 1084 | INIT_LIST_HEAD(&ctrl->ev_subs); |
0996517c HV |
1085 | ctrl->handler = hdl; |
1086 | ctrl->ops = ops; | |
1087 | ctrl->id = id; | |
1088 | ctrl->name = name; | |
1089 | ctrl->type = type; | |
1090 | ctrl->flags = flags; | |
1091 | ctrl->minimum = min; | |
1092 | ctrl->maximum = max; | |
1093 | ctrl->step = step; | |
1094 | ctrl->qmenu = qmenu; | |
1095 | ctrl->priv = priv; | |
1096 | ctrl->cur.val = ctrl->val = ctrl->default_value = def; | |
1097 | ||
1098 | if (ctrl->type == V4L2_CTRL_TYPE_STRING) { | |
1099 | ctrl->cur.string = (char *)&ctrl[1] + sz_extra - (max + 1); | |
1100 | ctrl->string = (char *)&ctrl[1] + sz_extra - 2 * (max + 1); | |
1101 | if (ctrl->minimum) | |
1102 | memset(ctrl->cur.string, ' ', ctrl->minimum); | |
1103 | } | |
1104 | if (handler_new_ref(hdl, ctrl)) { | |
1105 | kfree(ctrl); | |
1106 | return NULL; | |
1107 | } | |
1108 | mutex_lock(&hdl->lock); | |
1109 | list_add_tail(&ctrl->node, &hdl->ctrls); | |
1110 | mutex_unlock(&hdl->lock); | |
1111 | return ctrl; | |
1112 | } | |
1113 | ||
1114 | struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl, | |
1115 | const struct v4l2_ctrl_config *cfg, void *priv) | |
1116 | { | |
1117 | bool is_menu; | |
1118 | struct v4l2_ctrl *ctrl; | |
1119 | const char *name = cfg->name; | |
513521ea | 1120 | const char * const *qmenu = cfg->qmenu; |
0996517c HV |
1121 | enum v4l2_ctrl_type type = cfg->type; |
1122 | u32 flags = cfg->flags; | |
1123 | s32 min = cfg->min; | |
1124 | s32 max = cfg->max; | |
1125 | u32 step = cfg->step; | |
1126 | s32 def = cfg->def; | |
1127 | ||
1128 | if (name == NULL) | |
1129 | v4l2_ctrl_fill(cfg->id, &name, &type, &min, &max, &step, | |
1130 | &def, &flags); | |
1131 | ||
1132 | is_menu = (cfg->type == V4L2_CTRL_TYPE_MENU); | |
1133 | if (is_menu) | |
1134 | WARN_ON(step); | |
1135 | else | |
1136 | WARN_ON(cfg->menu_skip_mask); | |
1137 | if (is_menu && qmenu == NULL) | |
1138 | qmenu = v4l2_ctrl_get_menu(cfg->id); | |
1139 | ||
1140 | ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name, | |
1141 | type, min, max, | |
1142 | is_menu ? cfg->menu_skip_mask : step, | |
1143 | def, flags, qmenu, priv); | |
1144 | if (ctrl) { | |
1145 | ctrl->is_private = cfg->is_private; | |
1146 | ctrl->is_volatile = cfg->is_volatile; | |
1147 | } | |
1148 | return ctrl; | |
1149 | } | |
1150 | EXPORT_SYMBOL(v4l2_ctrl_new_custom); | |
1151 | ||
1152 | /* Helper function for standard non-menu controls */ | |
1153 | struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl, | |
1154 | const struct v4l2_ctrl_ops *ops, | |
1155 | u32 id, s32 min, s32 max, u32 step, s32 def) | |
1156 | { | |
1157 | const char *name; | |
1158 | enum v4l2_ctrl_type type; | |
1159 | u32 flags; | |
1160 | ||
1161 | v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags); | |
1162 | if (type == V4L2_CTRL_TYPE_MENU) { | |
1163 | handler_set_err(hdl, -EINVAL); | |
1164 | return NULL; | |
1165 | } | |
1166 | return v4l2_ctrl_new(hdl, ops, id, name, type, | |
1167 | min, max, step, def, flags, NULL, NULL); | |
1168 | } | |
1169 | EXPORT_SYMBOL(v4l2_ctrl_new_std); | |
1170 | ||
1171 | /* Helper function for standard menu controls */ | |
1172 | struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl, | |
1173 | const struct v4l2_ctrl_ops *ops, | |
1174 | u32 id, s32 max, s32 mask, s32 def) | |
1175 | { | |
513521ea | 1176 | const char * const *qmenu = v4l2_ctrl_get_menu(id); |
0996517c HV |
1177 | const char *name; |
1178 | enum v4l2_ctrl_type type; | |
1179 | s32 min; | |
1180 | s32 step; | |
1181 | u32 flags; | |
1182 | ||
1183 | v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags); | |
1184 | if (type != V4L2_CTRL_TYPE_MENU) { | |
1185 | handler_set_err(hdl, -EINVAL); | |
1186 | return NULL; | |
1187 | } | |
1188 | return v4l2_ctrl_new(hdl, ops, id, name, type, | |
1189 | 0, max, mask, def, flags, qmenu, NULL); | |
1190 | } | |
1191 | EXPORT_SYMBOL(v4l2_ctrl_new_std_menu); | |
1192 | ||
1193 | /* Add a control from another handler to this handler */ | |
1194 | struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl, | |
1195 | struct v4l2_ctrl *ctrl) | |
1196 | { | |
1197 | if (hdl == NULL || hdl->error) | |
1198 | return NULL; | |
1199 | if (ctrl == NULL) { | |
1200 | handler_set_err(hdl, -EINVAL); | |
1201 | return NULL; | |
1202 | } | |
1203 | if (ctrl->handler == hdl) | |
1204 | return ctrl; | |
1205 | return handler_new_ref(hdl, ctrl) ? NULL : ctrl; | |
1206 | } | |
1207 | EXPORT_SYMBOL(v4l2_ctrl_add_ctrl); | |
1208 | ||
1209 | /* Add the controls from another handler to our own. */ | |
1210 | int v4l2_ctrl_add_handler(struct v4l2_ctrl_handler *hdl, | |
1211 | struct v4l2_ctrl_handler *add) | |
1212 | { | |
1213 | struct v4l2_ctrl *ctrl; | |
1214 | int ret = 0; | |
1215 | ||
1216 | /* Do nothing if either handler is NULL or if they are the same */ | |
1217 | if (!hdl || !add || hdl == add) | |
1218 | return 0; | |
1219 | if (hdl->error) | |
1220 | return hdl->error; | |
1221 | mutex_lock(&add->lock); | |
1222 | list_for_each_entry(ctrl, &add->ctrls, node) { | |
1223 | /* Skip handler-private controls. */ | |
1224 | if (ctrl->is_private) | |
1225 | continue; | |
6e239399 HV |
1226 | /* And control classes */ |
1227 | if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS) | |
1228 | continue; | |
0996517c HV |
1229 | ret = handler_new_ref(hdl, ctrl); |
1230 | if (ret) | |
1231 | break; | |
1232 | } | |
1233 | mutex_unlock(&add->lock); | |
1234 | return ret; | |
1235 | } | |
1236 | EXPORT_SYMBOL(v4l2_ctrl_add_handler); | |
1237 | ||
1238 | /* Cluster controls */ | |
1239 | void v4l2_ctrl_cluster(unsigned ncontrols, struct v4l2_ctrl **controls) | |
1240 | { | |
1241 | int i; | |
1242 | ||
1243 | /* The first control is the master control and it must not be NULL */ | |
72d877ca | 1244 | BUG_ON(ncontrols == 0 || controls[0] == NULL); |
0996517c HV |
1245 | |
1246 | for (i = 0; i < ncontrols; i++) { | |
1247 | if (controls[i]) { | |
1248 | controls[i]->cluster = controls; | |
1249 | controls[i]->ncontrols = ncontrols; | |
1250 | } | |
1251 | } | |
1252 | } | |
1253 | EXPORT_SYMBOL(v4l2_ctrl_cluster); | |
1254 | ||
72d877ca HV |
1255 | void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls, |
1256 | u8 manual_val, bool set_volatile) | |
1257 | { | |
1258 | struct v4l2_ctrl *master = controls[0]; | |
1259 | u32 flag; | |
1260 | int i; | |
1261 | ||
1262 | v4l2_ctrl_cluster(ncontrols, controls); | |
1263 | WARN_ON(ncontrols <= 1); | |
82a7c049 | 1264 | WARN_ON(manual_val < master->minimum || manual_val > master->maximum); |
72d877ca HV |
1265 | master->is_auto = true; |
1266 | master->manual_mode_value = manual_val; | |
1267 | master->flags |= V4L2_CTRL_FLAG_UPDATE; | |
1268 | flag = is_cur_manual(master) ? 0 : V4L2_CTRL_FLAG_INACTIVE; | |
1269 | ||
1270 | for (i = 1; i < ncontrols; i++) | |
1271 | if (controls[i]) { | |
1272 | controls[i]->is_volatile = set_volatile; | |
1273 | controls[i]->flags |= flag; | |
1274 | } | |
1275 | } | |
1276 | EXPORT_SYMBOL(v4l2_ctrl_auto_cluster); | |
1277 | ||
0996517c HV |
1278 | /* Activate/deactivate a control. */ |
1279 | void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active) | |
1280 | { | |
6e239399 HV |
1281 | /* invert since the actual flag is called 'inactive' */ |
1282 | bool inactive = !active; | |
1283 | bool old; | |
1284 | ||
0996517c HV |
1285 | if (ctrl == NULL) |
1286 | return; | |
1287 | ||
6e239399 | 1288 | if (inactive) |
0996517c | 1289 | /* set V4L2_CTRL_FLAG_INACTIVE */ |
6e239399 | 1290 | old = test_and_set_bit(4, &ctrl->flags); |
0996517c HV |
1291 | else |
1292 | /* clear V4L2_CTRL_FLAG_INACTIVE */ | |
6e239399 HV |
1293 | old = test_and_clear_bit(4, &ctrl->flags); |
1294 | if (old != inactive) | |
1295 | send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS); | |
0996517c HV |
1296 | } |
1297 | EXPORT_SYMBOL(v4l2_ctrl_activate); | |
1298 | ||
1299 | /* Grab/ungrab a control. | |
1300 | Typically used when streaming starts and you want to grab controls, | |
1301 | preventing the user from changing them. | |
1302 | ||
1303 | Just call this and the framework will block any attempts to change | |
1304 | these controls. */ | |
1305 | void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed) | |
1306 | { | |
6e239399 HV |
1307 | bool old; |
1308 | ||
0996517c HV |
1309 | if (ctrl == NULL) |
1310 | return; | |
1311 | ||
6e239399 | 1312 | v4l2_ctrl_lock(ctrl); |
0996517c HV |
1313 | if (grabbed) |
1314 | /* set V4L2_CTRL_FLAG_GRABBED */ | |
6e239399 | 1315 | old = test_and_set_bit(1, &ctrl->flags); |
0996517c HV |
1316 | else |
1317 | /* clear V4L2_CTRL_FLAG_GRABBED */ | |
6e239399 HV |
1318 | old = test_and_clear_bit(1, &ctrl->flags); |
1319 | if (old != grabbed) | |
1320 | send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_FLAGS); | |
1321 | v4l2_ctrl_unlock(ctrl); | |
0996517c HV |
1322 | } |
1323 | EXPORT_SYMBOL(v4l2_ctrl_grab); | |
1324 | ||
1325 | /* Log the control name and value */ | |
1326 | static void log_ctrl(const struct v4l2_ctrl *ctrl, | |
1327 | const char *prefix, const char *colon) | |
1328 | { | |
1329 | int fl_inact = ctrl->flags & V4L2_CTRL_FLAG_INACTIVE; | |
1330 | int fl_grabbed = ctrl->flags & V4L2_CTRL_FLAG_GRABBED; | |
1331 | ||
1332 | if (ctrl->flags & (V4L2_CTRL_FLAG_DISABLED | V4L2_CTRL_FLAG_WRITE_ONLY)) | |
1333 | return; | |
1334 | if (ctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS) | |
1335 | return; | |
1336 | ||
1337 | printk(KERN_INFO "%s%s%s: ", prefix, colon, ctrl->name); | |
1338 | ||
1339 | switch (ctrl->type) { | |
1340 | case V4L2_CTRL_TYPE_INTEGER: | |
1341 | printk(KERN_CONT "%d", ctrl->cur.val); | |
1342 | break; | |
1343 | case V4L2_CTRL_TYPE_BOOLEAN: | |
1344 | printk(KERN_CONT "%s", ctrl->cur.val ? "true" : "false"); | |
1345 | break; | |
1346 | case V4L2_CTRL_TYPE_MENU: | |
1347 | printk(KERN_CONT "%s", ctrl->qmenu[ctrl->cur.val]); | |
1348 | break; | |
1349 | case V4L2_CTRL_TYPE_INTEGER64: | |
1350 | printk(KERN_CONT "%lld", ctrl->cur.val64); | |
1351 | break; | |
1352 | case V4L2_CTRL_TYPE_STRING: | |
1353 | printk(KERN_CONT "%s", ctrl->cur.string); | |
1354 | break; | |
1355 | default: | |
1356 | printk(KERN_CONT "unknown type %d", ctrl->type); | |
1357 | break; | |
1358 | } | |
1359 | if (fl_inact && fl_grabbed) | |
1360 | printk(KERN_CONT " (inactive, grabbed)\n"); | |
1361 | else if (fl_inact) | |
1362 | printk(KERN_CONT " (inactive)\n"); | |
1363 | else if (fl_grabbed) | |
1364 | printk(KERN_CONT " (grabbed)\n"); | |
1365 | else | |
1366 | printk(KERN_CONT "\n"); | |
1367 | } | |
1368 | ||
1369 | /* Log all controls owned by the handler */ | |
1370 | void v4l2_ctrl_handler_log_status(struct v4l2_ctrl_handler *hdl, | |
1371 | const char *prefix) | |
1372 | { | |
1373 | struct v4l2_ctrl *ctrl; | |
1374 | const char *colon = ""; | |
1375 | int len; | |
1376 | ||
1377 | if (hdl == NULL) | |
1378 | return; | |
1379 | if (prefix == NULL) | |
1380 | prefix = ""; | |
1381 | len = strlen(prefix); | |
1382 | if (len && prefix[len - 1] != ' ') | |
1383 | colon = ": "; | |
1384 | mutex_lock(&hdl->lock); | |
1385 | list_for_each_entry(ctrl, &hdl->ctrls, node) | |
1386 | if (!(ctrl->flags & V4L2_CTRL_FLAG_DISABLED)) | |
1387 | log_ctrl(ctrl, prefix, colon); | |
1388 | mutex_unlock(&hdl->lock); | |
1389 | } | |
1390 | EXPORT_SYMBOL(v4l2_ctrl_handler_log_status); | |
1391 | ||
1392 | /* Call s_ctrl for all controls owned by the handler */ | |
1393 | int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler *hdl) | |
1394 | { | |
1395 | struct v4l2_ctrl *ctrl; | |
1396 | int ret = 0; | |
1397 | ||
1398 | if (hdl == NULL) | |
1399 | return 0; | |
1400 | mutex_lock(&hdl->lock); | |
1401 | list_for_each_entry(ctrl, &hdl->ctrls, node) | |
1402 | ctrl->done = false; | |
1403 | ||
1404 | list_for_each_entry(ctrl, &hdl->ctrls, node) { | |
1405 | struct v4l2_ctrl *master = ctrl->cluster[0]; | |
1406 | int i; | |
1407 | ||
1408 | /* Skip if this control was already handled by a cluster. */ | |
1409 | if (ctrl->done) | |
1410 | continue; | |
1411 | ||
2a863793 HV |
1412 | for (i = 0; i < master->ncontrols; i++) { |
1413 | if (master->cluster[i]) { | |
1414 | cur_to_new(master->cluster[i]); | |
1415 | master->cluster[i]->is_new = 1; | |
1416 | } | |
1417 | } | |
0996517c HV |
1418 | |
1419 | /* Skip button controls and read-only controls. */ | |
1420 | if (ctrl->type == V4L2_CTRL_TYPE_BUTTON || | |
1421 | (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY)) | |
1422 | continue; | |
54c911eb | 1423 | ret = call_op(master, s_ctrl); |
0996517c HV |
1424 | if (ret) |
1425 | break; | |
1426 | for (i = 0; i < master->ncontrols; i++) | |
1427 | if (master->cluster[i]) | |
1428 | master->cluster[i]->done = true; | |
1429 | } | |
1430 | mutex_unlock(&hdl->lock); | |
1431 | return ret; | |
1432 | } | |
1433 | EXPORT_SYMBOL(v4l2_ctrl_handler_setup); | |
1434 | ||
1435 | /* Implement VIDIOC_QUERYCTRL */ | |
1436 | int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc) | |
1437 | { | |
1438 | u32 id = qc->id & V4L2_CTRL_ID_MASK; | |
1439 | struct v4l2_ctrl_ref *ref; | |
1440 | struct v4l2_ctrl *ctrl; | |
1441 | ||
1442 | if (hdl == NULL) | |
1443 | return -EINVAL; | |
1444 | ||
1445 | mutex_lock(&hdl->lock); | |
1446 | ||
1447 | /* Try to find it */ | |
1448 | ref = find_ref(hdl, id); | |
1449 | ||
1450 | if ((qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) && !list_empty(&hdl->ctrl_refs)) { | |
1451 | /* Find the next control with ID > qc->id */ | |
1452 | ||
1453 | /* Did we reach the end of the control list? */ | |
1454 | if (id >= node2id(hdl->ctrl_refs.prev)) { | |
1455 | ref = NULL; /* Yes, so there is no next control */ | |
1456 | } else if (ref) { | |
1457 | /* We found a control with the given ID, so just get | |
1458 | the next one in the list. */ | |
1459 | ref = list_entry(ref->node.next, typeof(*ref), node); | |
1460 | } else { | |
1461 | /* No control with the given ID exists, so start | |
1462 | searching for the next largest ID. We know there | |
1463 | is one, otherwise the first 'if' above would have | |
1464 | been true. */ | |
1465 | list_for_each_entry(ref, &hdl->ctrl_refs, node) | |
1466 | if (id < ref->ctrl->id) | |
1467 | break; | |
1468 | } | |
1469 | } | |
1470 | mutex_unlock(&hdl->lock); | |
1471 | if (!ref) | |
1472 | return -EINVAL; | |
1473 | ||
1474 | ctrl = ref->ctrl; | |
1475 | memset(qc, 0, sizeof(*qc)); | |
829fb2dc HV |
1476 | if (id >= V4L2_CID_PRIVATE_BASE) |
1477 | qc->id = id; | |
1478 | else | |
1479 | qc->id = ctrl->id; | |
0996517c HV |
1480 | strlcpy(qc->name, ctrl->name, sizeof(qc->name)); |
1481 | qc->minimum = ctrl->minimum; | |
1482 | qc->maximum = ctrl->maximum; | |
1483 | qc->default_value = ctrl->default_value; | |
eac9aa00 | 1484 | if (ctrl->type == V4L2_CTRL_TYPE_MENU) |
0996517c HV |
1485 | qc->step = 1; |
1486 | else | |
1487 | qc->step = ctrl->step; | |
1488 | qc->flags = ctrl->flags; | |
1489 | qc->type = ctrl->type; | |
1490 | return 0; | |
1491 | } | |
1492 | EXPORT_SYMBOL(v4l2_queryctrl); | |
1493 | ||
1494 | int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc) | |
1495 | { | |
87a0c94c HV |
1496 | if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL) |
1497 | return -EINVAL; | |
0996517c HV |
1498 | return v4l2_queryctrl(sd->ctrl_handler, qc); |
1499 | } | |
1500 | EXPORT_SYMBOL(v4l2_subdev_queryctrl); | |
1501 | ||
1502 | /* Implement VIDIOC_QUERYMENU */ | |
1503 | int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm) | |
1504 | { | |
1505 | struct v4l2_ctrl *ctrl; | |
1506 | u32 i = qm->index; | |
1507 | ||
1508 | ctrl = v4l2_ctrl_find(hdl, qm->id); | |
1509 | if (!ctrl) | |
1510 | return -EINVAL; | |
1511 | ||
1512 | qm->reserved = 0; | |
1513 | /* Sanity checks */ | |
1514 | if (ctrl->qmenu == NULL || | |
1515 | i < ctrl->minimum || i > ctrl->maximum) | |
1516 | return -EINVAL; | |
1517 | /* Use mask to see if this menu item should be skipped */ | |
1518 | if (ctrl->menu_skip_mask & (1 << i)) | |
1519 | return -EINVAL; | |
1520 | /* Empty menu items should also be skipped */ | |
1521 | if (ctrl->qmenu[i] == NULL || ctrl->qmenu[i][0] == '\0') | |
1522 | return -EINVAL; | |
1523 | strlcpy(qm->name, ctrl->qmenu[i], sizeof(qm->name)); | |
1524 | return 0; | |
1525 | } | |
1526 | EXPORT_SYMBOL(v4l2_querymenu); | |
1527 | ||
1528 | int v4l2_subdev_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qm) | |
1529 | { | |
1530 | return v4l2_querymenu(sd->ctrl_handler, qm); | |
1531 | } | |
1532 | EXPORT_SYMBOL(v4l2_subdev_querymenu); | |
1533 | ||
1534 | ||
1535 | ||
1536 | /* Some general notes on the atomic requirements of VIDIOC_G/TRY/S_EXT_CTRLS: | |
1537 | ||
1538 | It is not a fully atomic operation, just best-effort only. After all, if | |
1539 | multiple controls have to be set through multiple i2c writes (for example) | |
1540 | then some initial writes may succeed while others fail. Thus leaving the | |
1541 | system in an inconsistent state. The question is how much effort you are | |
1542 | willing to spend on trying to make something atomic that really isn't. | |
1543 | ||
1544 | From the point of view of an application the main requirement is that | |
1545 | when you call VIDIOC_S_EXT_CTRLS and some values are invalid then an | |
1546 | error should be returned without actually affecting any controls. | |
1547 | ||
1548 | If all the values are correct, then it is acceptable to just give up | |
1549 | in case of low-level errors. | |
1550 | ||
1551 | It is important though that the application can tell when only a partial | |
1552 | configuration was done. The way we do that is through the error_idx field | |
1553 | of struct v4l2_ext_controls: if that is equal to the count field then no | |
1554 | controls were affected. Otherwise all controls before that index were | |
1555 | successful in performing their 'get' or 'set' operation, the control at | |
1556 | the given index failed, and you don't know what happened with the controls | |
1557 | after the failed one. Since if they were part of a control cluster they | |
1558 | could have been successfully processed (if a cluster member was encountered | |
1559 | at index < error_idx), they could have failed (if a cluster member was at | |
1560 | error_idx), or they may not have been processed yet (if the first cluster | |
1561 | member appeared after error_idx). | |
1562 | ||
1563 | It is all fairly theoretical, though. In practice all you can do is to | |
1564 | bail out. If error_idx == count, then it is an application bug. If | |
1565 | error_idx < count then it is only an application bug if the error code was | |
1566 | EBUSY. That usually means that something started streaming just when you | |
1567 | tried to set the controls. In all other cases it is a driver/hardware | |
1568 | problem and all you can do is to retry or bail out. | |
1569 | ||
1570 | Note that these rules do not apply to VIDIOC_TRY_EXT_CTRLS: since that | |
1571 | never modifies controls the error_idx is just set to whatever control | |
1572 | has an invalid value. | |
1573 | */ | |
1574 | ||
1575 | /* Prepare for the extended g/s/try functions. | |
1576 | Find the controls in the control array and do some basic checks. */ | |
1577 | static int prepare_ext_ctrls(struct v4l2_ctrl_handler *hdl, | |
1578 | struct v4l2_ext_controls *cs, | |
37cd3b73 | 1579 | struct ctrl_helper *helpers) |
0996517c HV |
1580 | { |
1581 | u32 i; | |
1582 | ||
1583 | for (i = 0; i < cs->count; i++) { | |
1584 | struct v4l2_ext_control *c = &cs->controls[i]; | |
1585 | struct v4l2_ctrl *ctrl; | |
1586 | u32 id = c->id & V4L2_CTRL_ID_MASK; | |
1587 | ||
37cd3b73 | 1588 | cs->error_idx = i; |
0996517c HV |
1589 | |
1590 | if (cs->ctrl_class && V4L2_CTRL_ID2CLASS(id) != cs->ctrl_class) | |
1591 | return -EINVAL; | |
1592 | ||
1593 | /* Old-style private controls are not allowed for | |
1594 | extended controls */ | |
1595 | if (id >= V4L2_CID_PRIVATE_BASE) | |
1596 | return -EINVAL; | |
1597 | ctrl = v4l2_ctrl_find(hdl, id); | |
1598 | if (ctrl == NULL) | |
1599 | return -EINVAL; | |
1600 | if (ctrl->flags & V4L2_CTRL_FLAG_DISABLED) | |
1601 | return -EINVAL; | |
1602 | ||
1603 | helpers[i].ctrl = ctrl; | |
1604 | helpers[i].handled = false; | |
1605 | } | |
1606 | return 0; | |
1607 | } | |
1608 | ||
1609 | typedef int (*cluster_func)(struct v4l2_ext_control *c, | |
1610 | struct v4l2_ctrl *ctrl); | |
1611 | ||
1612 | /* Walk over all controls in v4l2_ext_controls belonging to the same cluster | |
1613 | and call the provided function. */ | |
1614 | static int cluster_walk(unsigned from, | |
1615 | struct v4l2_ext_controls *cs, | |
1616 | struct ctrl_helper *helpers, | |
1617 | cluster_func f) | |
1618 | { | |
1619 | struct v4l2_ctrl **cluster = helpers[from].ctrl->cluster; | |
1620 | int ret = 0; | |
1621 | int i; | |
1622 | ||
1623 | /* Find any controls from the same cluster and call the function */ | |
1624 | for (i = from; !ret && i < cs->count; i++) { | |
1625 | struct v4l2_ctrl *ctrl = helpers[i].ctrl; | |
1626 | ||
1627 | if (!helpers[i].handled && ctrl->cluster == cluster) | |
1628 | ret = f(&cs->controls[i], ctrl); | |
1629 | } | |
1630 | return ret; | |
1631 | } | |
1632 | ||
1633 | static void cluster_done(unsigned from, | |
1634 | struct v4l2_ext_controls *cs, | |
1635 | struct ctrl_helper *helpers) | |
1636 | { | |
1637 | struct v4l2_ctrl **cluster = helpers[from].ctrl->cluster; | |
1638 | int i; | |
1639 | ||
1640 | /* Find any controls from the same cluster and mark them as handled */ | |
1641 | for (i = from; i < cs->count; i++) | |
1642 | if (helpers[i].ctrl->cluster == cluster) | |
1643 | helpers[i].handled = true; | |
1644 | } | |
1645 | ||
1646 | /* Handles the corner case where cs->count == 0. It checks whether the | |
1647 | specified control class exists. If that class ID is 0, then it checks | |
1648 | whether there are any controls at all. */ | |
1649 | static int class_check(struct v4l2_ctrl_handler *hdl, u32 ctrl_class) | |
1650 | { | |
1651 | if (ctrl_class == 0) | |
1652 | return list_empty(&hdl->ctrl_refs) ? -EINVAL : 0; | |
1653 | return find_ref_lock(hdl, ctrl_class | 1) ? 0 : -EINVAL; | |
1654 | } | |
1655 | ||
1656 | ||
1657 | ||
1658 | /* Get extended controls. Allocates the helpers array if needed. */ | |
1659 | int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs) | |
1660 | { | |
1661 | struct ctrl_helper helper[4]; | |
1662 | struct ctrl_helper *helpers = helper; | |
1663 | int ret; | |
ddac5c10 | 1664 | int i, j; |
0996517c HV |
1665 | |
1666 | cs->error_idx = cs->count; | |
1667 | cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class); | |
1668 | ||
1669 | if (hdl == NULL) | |
1670 | return -EINVAL; | |
1671 | ||
1672 | if (cs->count == 0) | |
1673 | return class_check(hdl, cs->ctrl_class); | |
1674 | ||
1675 | if (cs->count > ARRAY_SIZE(helper)) { | |
1676 | helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL); | |
1677 | if (helpers == NULL) | |
1678 | return -ENOMEM; | |
1679 | } | |
1680 | ||
37cd3b73 HV |
1681 | ret = prepare_ext_ctrls(hdl, cs, helpers); |
1682 | cs->error_idx = cs->count; | |
0996517c HV |
1683 | |
1684 | for (i = 0; !ret && i < cs->count; i++) | |
1685 | if (helpers[i].ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY) | |
1686 | ret = -EACCES; | |
1687 | ||
1688 | for (i = 0; !ret && i < cs->count; i++) { | |
1689 | struct v4l2_ctrl *ctrl = helpers[i].ctrl; | |
1690 | struct v4l2_ctrl *master = ctrl->cluster[0]; | |
ddac5c10 | 1691 | bool has_volatiles; |
0996517c HV |
1692 | |
1693 | if (helpers[i].handled) | |
1694 | continue; | |
1695 | ||
1696 | cs->error_idx = i; | |
1697 | ||
ddac5c10 HV |
1698 | /* Any volatile controls requested from this cluster? */ |
1699 | has_volatiles = ctrl->is_volatile; | |
1700 | if (!has_volatiles && has_op(master, g_volatile_ctrl) && | |
1701 | master->ncontrols > 1) | |
1702 | has_volatiles = cluster_walk(i, cs, helpers, | |
1703 | ctrl_is_volatile); | |
1704 | ||
0996517c | 1705 | v4l2_ctrl_lock(master); |
ddac5c10 HV |
1706 | |
1707 | /* g_volatile_ctrl will update the new control values */ | |
72d877ca | 1708 | if (has_volatiles && !is_cur_manual(master)) { |
ddac5c10 HV |
1709 | for (j = 0; j < master->ncontrols; j++) |
1710 | cur_to_new(master->cluster[j]); | |
54c911eb | 1711 | ret = call_op(master, g_volatile_ctrl); |
ddac5c10 HV |
1712 | } |
1713 | /* If OK, then copy the current (for non-volatile controls) | |
1714 | or the new (for volatile controls) control values to the | |
1715 | caller */ | |
0996517c | 1716 | if (!ret) |
ddac5c10 | 1717 | ret = cluster_walk(i, cs, helpers, ctrl_to_user); |
0996517c HV |
1718 | v4l2_ctrl_unlock(master); |
1719 | cluster_done(i, cs, helpers); | |
1720 | } | |
1721 | ||
1722 | if (cs->count > ARRAY_SIZE(helper)) | |
1723 | kfree(helpers); | |
1724 | return ret; | |
1725 | } | |
1726 | EXPORT_SYMBOL(v4l2_g_ext_ctrls); | |
1727 | ||
1728 | int v4l2_subdev_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs) | |
1729 | { | |
1730 | return v4l2_g_ext_ctrls(sd->ctrl_handler, cs); | |
1731 | } | |
1732 | EXPORT_SYMBOL(v4l2_subdev_g_ext_ctrls); | |
1733 | ||
1734 | /* Helper function to get a single control */ | |
1735 | static int get_ctrl(struct v4l2_ctrl *ctrl, s32 *val) | |
1736 | { | |
1737 | struct v4l2_ctrl *master = ctrl->cluster[0]; | |
1738 | int ret = 0; | |
ddac5c10 | 1739 | int i; |
0996517c HV |
1740 | |
1741 | if (ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY) | |
1742 | return -EACCES; | |
1743 | ||
1744 | v4l2_ctrl_lock(master); | |
1745 | /* g_volatile_ctrl will update the current control values */ | |
72d877ca | 1746 | if (ctrl->is_volatile && !is_cur_manual(master)) { |
ddac5c10 HV |
1747 | for (i = 0; i < master->ncontrols; i++) |
1748 | cur_to_new(master->cluster[i]); | |
54c911eb | 1749 | ret = call_op(master, g_volatile_ctrl); |
ddac5c10 HV |
1750 | *val = ctrl->val; |
1751 | } else { | |
1752 | *val = ctrl->cur.val; | |
1753 | } | |
0996517c HV |
1754 | v4l2_ctrl_unlock(master); |
1755 | return ret; | |
1756 | } | |
1757 | ||
1758 | int v4l2_g_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_control *control) | |
1759 | { | |
1760 | struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id); | |
1761 | ||
1762 | if (ctrl == NULL || !type_is_int(ctrl)) | |
1763 | return -EINVAL; | |
1764 | return get_ctrl(ctrl, &control->value); | |
1765 | } | |
1766 | EXPORT_SYMBOL(v4l2_g_ctrl); | |
1767 | ||
1768 | int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control) | |
1769 | { | |
1770 | return v4l2_g_ctrl(sd->ctrl_handler, control); | |
1771 | } | |
1772 | EXPORT_SYMBOL(v4l2_subdev_g_ctrl); | |
1773 | ||
1774 | s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl) | |
1775 | { | |
1776 | s32 val = 0; | |
1777 | ||
1778 | /* It's a driver bug if this happens. */ | |
1779 | WARN_ON(!type_is_int(ctrl)); | |
1780 | get_ctrl(ctrl, &val); | |
1781 | return val; | |
1782 | } | |
1783 | EXPORT_SYMBOL(v4l2_ctrl_g_ctrl); | |
1784 | ||
1785 | ||
1786 | /* Core function that calls try/s_ctrl and ensures that the new value is | |
1787 | copied to the current value on a set. | |
1788 | Must be called with ctrl->handler->lock held. */ | |
ab892bac HV |
1789 | static int try_or_set_control_cluster(struct v4l2_fh *fh, |
1790 | struct v4l2_ctrl *master, bool set) | |
0996517c | 1791 | { |
72d877ca | 1792 | bool update_flag; |
0996517c HV |
1793 | bool try = !set; |
1794 | int ret = 0; | |
1795 | int i; | |
1796 | ||
1797 | /* Go through the cluster and either validate the new value or | |
1798 | (if no new value was set), copy the current value to the new | |
1799 | value, ensuring a consistent view for the control ops when | |
1800 | called. */ | |
1801 | for (i = 0; !ret && i < master->ncontrols; i++) { | |
1802 | struct v4l2_ctrl *ctrl = master->cluster[i]; | |
1803 | ||
1804 | if (ctrl == NULL) | |
1805 | continue; | |
1806 | ||
2a863793 | 1807 | if (ctrl->is_new) { |
0996517c HV |
1808 | /* Double check this: it may have changed since the |
1809 | last check in try_or_set_ext_ctrls(). */ | |
1810 | if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)) | |
1811 | return -EBUSY; | |
1812 | ||
1813 | /* Validate if required */ | |
1814 | if (!set) | |
1815 | ret = validate_new(ctrl); | |
1816 | continue; | |
1817 | } | |
1818 | /* No new value was set, so copy the current and force | |
1819 | a call to try_ctrl later, since the values for the cluster | |
1820 | may now have changed and the end result might be invalid. */ | |
1821 | try = true; | |
1822 | cur_to_new(ctrl); | |
1823 | } | |
1824 | ||
1825 | /* For larger clusters you have to call try_ctrl again to | |
1826 | verify that the controls are still valid after the | |
1827 | 'cur_to_new' above. */ | |
54c911eb HV |
1828 | if (!ret && try) |
1829 | ret = call_op(master, try_ctrl); | |
0996517c HV |
1830 | |
1831 | /* Don't set if there is no change */ | |
72d877ca HV |
1832 | if (ret || !set || !cluster_changed(master)) |
1833 | return ret; | |
1834 | ret = call_op(master, s_ctrl); | |
1835 | /* If OK, then make the new values permanent. */ | |
1836 | if (ret) | |
1837 | return ret; | |
1838 | ||
1839 | update_flag = is_cur_manual(master) != is_new_manual(master); | |
1840 | for (i = 0; i < master->ncontrols; i++) | |
ab892bac | 1841 | new_to_cur(fh, master->cluster[i], update_flag && i > 0); |
72d877ca | 1842 | return 0; |
0996517c HV |
1843 | } |
1844 | ||
1845 | /* Try or set controls. */ | |
ab892bac HV |
1846 | static int try_or_set_ext_ctrls(struct v4l2_fh *fh, |
1847 | struct v4l2_ctrl_handler *hdl, | |
0996517c HV |
1848 | struct v4l2_ext_controls *cs, |
1849 | struct ctrl_helper *helpers, | |
1850 | bool set) | |
1851 | { | |
1852 | unsigned i, j; | |
1853 | int ret = 0; | |
1854 | ||
0996517c HV |
1855 | for (i = 0; i < cs->count; i++) { |
1856 | struct v4l2_ctrl *ctrl = helpers[i].ctrl; | |
1857 | ||
37cd3b73 | 1858 | cs->error_idx = i; |
0996517c HV |
1859 | |
1860 | if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY) | |
1861 | return -EACCES; | |
1862 | /* This test is also done in try_set_control_cluster() which | |
1863 | is called in atomic context, so that has the final say, | |
1864 | but it makes sense to do an up-front check as well. Once | |
1865 | an error occurs in try_set_control_cluster() some other | |
1866 | controls may have been set already and we want to do a | |
1867 | best-effort to avoid that. */ | |
1868 | if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)) | |
1869 | return -EBUSY; | |
1870 | } | |
1871 | ||
1872 | for (i = 0; !ret && i < cs->count; i++) { | |
1873 | struct v4l2_ctrl *ctrl = helpers[i].ctrl; | |
1874 | struct v4l2_ctrl *master = ctrl->cluster[0]; | |
1875 | ||
0996517c HV |
1876 | if (helpers[i].handled) |
1877 | continue; | |
1878 | ||
37cd3b73 | 1879 | cs->error_idx = i; |
0996517c HV |
1880 | v4l2_ctrl_lock(ctrl); |
1881 | ||
2a863793 | 1882 | /* Reset the 'is_new' flags of the cluster */ |
0996517c HV |
1883 | for (j = 0; j < master->ncontrols; j++) |
1884 | if (master->cluster[j]) | |
2a863793 | 1885 | master->cluster[j]->is_new = 0; |
0996517c HV |
1886 | |
1887 | /* Copy the new caller-supplied control values. | |
2a863793 | 1888 | user_to_new() sets 'is_new' to 1. */ |
0996517c HV |
1889 | ret = cluster_walk(i, cs, helpers, user_to_new); |
1890 | ||
1891 | if (!ret) | |
ab892bac | 1892 | ret = try_or_set_control_cluster(fh, master, set); |
0996517c HV |
1893 | |
1894 | /* Copy the new values back to userspace. */ | |
1895 | if (!ret) | |
1896 | ret = cluster_walk(i, cs, helpers, new_to_user); | |
1897 | ||
1898 | v4l2_ctrl_unlock(ctrl); | |
1899 | cluster_done(i, cs, helpers); | |
1900 | } | |
1901 | return ret; | |
1902 | } | |
1903 | ||
1904 | /* Try or try-and-set controls */ | |
ab892bac | 1905 | static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl, |
0996517c HV |
1906 | struct v4l2_ext_controls *cs, |
1907 | bool set) | |
1908 | { | |
1909 | struct ctrl_helper helper[4]; | |
1910 | struct ctrl_helper *helpers = helper; | |
1911 | int ret; | |
1912 | int i; | |
1913 | ||
1914 | cs->error_idx = cs->count; | |
1915 | cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class); | |
1916 | ||
1917 | if (hdl == NULL) | |
1918 | return -EINVAL; | |
1919 | ||
1920 | if (cs->count == 0) | |
1921 | return class_check(hdl, cs->ctrl_class); | |
1922 | ||
1923 | if (cs->count > ARRAY_SIZE(helper)) { | |
1924 | helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL); | |
1925 | if (!helpers) | |
1926 | return -ENOMEM; | |
1927 | } | |
37cd3b73 | 1928 | ret = prepare_ext_ctrls(hdl, cs, helpers); |
0996517c HV |
1929 | |
1930 | /* First 'try' all controls and abort on error */ | |
37cd3b73 | 1931 | if (!ret) |
ab892bac | 1932 | ret = try_or_set_ext_ctrls(NULL, hdl, cs, helpers, false); |
0996517c HV |
1933 | /* If this is a 'set' operation and the initial 'try' failed, |
1934 | then set error_idx to count to tell the application that no | |
1935 | controls changed value yet. */ | |
1936 | if (set) | |
1937 | cs->error_idx = cs->count; | |
1938 | if (!ret && set) { | |
1939 | /* Reset 'handled' state */ | |
1940 | for (i = 0; i < cs->count; i++) | |
1941 | helpers[i].handled = false; | |
ab892bac | 1942 | ret = try_or_set_ext_ctrls(fh, hdl, cs, helpers, true); |
0996517c HV |
1943 | } |
1944 | ||
0996517c HV |
1945 | if (cs->count > ARRAY_SIZE(helper)) |
1946 | kfree(helpers); | |
1947 | return ret; | |
1948 | } | |
1949 | ||
1950 | int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct v4l2_ext_controls *cs) | |
1951 | { | |
ab892bac | 1952 | return try_set_ext_ctrls(NULL, hdl, cs, false); |
0996517c HV |
1953 | } |
1954 | EXPORT_SYMBOL(v4l2_try_ext_ctrls); | |
1955 | ||
ab892bac HV |
1956 | int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl, |
1957 | struct v4l2_ext_controls *cs) | |
0996517c | 1958 | { |
ab892bac | 1959 | return try_set_ext_ctrls(fh, hdl, cs, true); |
0996517c HV |
1960 | } |
1961 | EXPORT_SYMBOL(v4l2_s_ext_ctrls); | |
1962 | ||
1963 | int v4l2_subdev_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs) | |
1964 | { | |
ab892bac | 1965 | return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, false); |
0996517c HV |
1966 | } |
1967 | EXPORT_SYMBOL(v4l2_subdev_try_ext_ctrls); | |
1968 | ||
1969 | int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs) | |
1970 | { | |
ab892bac | 1971 | return try_set_ext_ctrls(NULL, sd->ctrl_handler, cs, true); |
0996517c HV |
1972 | } |
1973 | EXPORT_SYMBOL(v4l2_subdev_s_ext_ctrls); | |
1974 | ||
1975 | /* Helper function for VIDIOC_S_CTRL compatibility */ | |
ab892bac | 1976 | static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, s32 *val) |
0996517c HV |
1977 | { |
1978 | struct v4l2_ctrl *master = ctrl->cluster[0]; | |
1979 | int ret; | |
1980 | int i; | |
1981 | ||
1982 | v4l2_ctrl_lock(ctrl); | |
1983 | ||
2a863793 | 1984 | /* Reset the 'is_new' flags of the cluster */ |
0996517c HV |
1985 | for (i = 0; i < master->ncontrols; i++) |
1986 | if (master->cluster[i]) | |
2a863793 | 1987 | master->cluster[i]->is_new = 0; |
0996517c HV |
1988 | |
1989 | ctrl->val = *val; | |
2a863793 | 1990 | ctrl->is_new = 1; |
ab892bac | 1991 | ret = try_or_set_control_cluster(NULL, master, false); |
0996517c | 1992 | if (!ret) |
ab892bac | 1993 | ret = try_or_set_control_cluster(fh, master, true); |
0996517c HV |
1994 | *val = ctrl->cur.val; |
1995 | v4l2_ctrl_unlock(ctrl); | |
1996 | return ret; | |
1997 | } | |
1998 | ||
ab892bac HV |
1999 | int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl, |
2000 | struct v4l2_control *control) | |
0996517c HV |
2001 | { |
2002 | struct v4l2_ctrl *ctrl = v4l2_ctrl_find(hdl, control->id); | |
2003 | ||
2004 | if (ctrl == NULL || !type_is_int(ctrl)) | |
2005 | return -EINVAL; | |
2006 | ||
7ebbc39f HV |
2007 | if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY) |
2008 | return -EACCES; | |
2009 | ||
ab892bac | 2010 | return set_ctrl(fh, ctrl, &control->value); |
0996517c HV |
2011 | } |
2012 | EXPORT_SYMBOL(v4l2_s_ctrl); | |
2013 | ||
2014 | int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *control) | |
2015 | { | |
ab892bac | 2016 | return v4l2_s_ctrl(NULL, sd->ctrl_handler, control); |
0996517c HV |
2017 | } |
2018 | EXPORT_SYMBOL(v4l2_subdev_s_ctrl); | |
2019 | ||
2020 | int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val) | |
2021 | { | |
2022 | /* It's a driver bug if this happens. */ | |
2023 | WARN_ON(!type_is_int(ctrl)); | |
ab892bac | 2024 | return set_ctrl(NULL, ctrl, &val); |
0996517c HV |
2025 | } |
2026 | EXPORT_SYMBOL(v4l2_ctrl_s_ctrl); | |
6e239399 | 2027 | |
77068d36 HV |
2028 | void v4l2_ctrl_add_event(struct v4l2_ctrl *ctrl, |
2029 | struct v4l2_subscribed_event *sev) | |
6e239399 | 2030 | { |
6e239399 | 2031 | v4l2_ctrl_lock(ctrl); |
77068d36 | 2032 | list_add_tail(&sev->node, &ctrl->ev_subs); |
6e239399 | 2033 | if (ctrl->type != V4L2_CTRL_TYPE_CTRL_CLASS && |
77068d36 | 2034 | (sev->flags & V4L2_EVENT_SUB_FL_SEND_INITIAL)) { |
6e239399 | 2035 | struct v4l2_event ev; |
c12fcfd6 | 2036 | u32 changes = V4L2_EVENT_CTRL_CH_FLAGS; |
6e239399 | 2037 | |
c12fcfd6 HV |
2038 | if (!(ctrl->flags & V4L2_CTRL_FLAG_WRITE_ONLY)) |
2039 | changes |= V4L2_EVENT_CTRL_CH_VALUE; | |
2040 | fill_event(&ev, ctrl, changes); | |
77068d36 | 2041 | v4l2_event_queue_fh(sev->fh, &ev); |
6e239399 HV |
2042 | } |
2043 | v4l2_ctrl_unlock(ctrl); | |
2044 | } | |
77068d36 | 2045 | EXPORT_SYMBOL(v4l2_ctrl_add_event); |
6e239399 | 2046 | |
77068d36 HV |
2047 | void v4l2_ctrl_del_event(struct v4l2_ctrl *ctrl, |
2048 | struct v4l2_subscribed_event *sev) | |
6e239399 | 2049 | { |
6e239399 | 2050 | v4l2_ctrl_lock(ctrl); |
77068d36 | 2051 | list_del(&sev->node); |
6e239399 HV |
2052 | v4l2_ctrl_unlock(ctrl); |
2053 | } | |
77068d36 | 2054 | EXPORT_SYMBOL(v4l2_ctrl_del_event); |