v4l2-common.c 34.6 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14
/*
 *	Video for Linux Two
 *
 *	A generic video device interface for the LINUX operating system
 *	using a set of device structures/vectors for low level operations.
 *
 *	This file replaces the videodev.c file that comes with the
 *	regular kernel distribution.
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 *
15
 * Author:	Bill Dirks <bill@thedirks.org>
L
Linus Torvalds 已提交
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
 *		based on code by Alan Cox, <alan@cymru.net>
 *
 */

/*
 * Video capture interface for Linux
 *
 *	A generic video device interface for the LINUX operating system
 *	using a set of device structures/vectors for low level operations.
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
31
 * Author:	Alan Cox, <alan@lxorguk.ukuu.org.uk>
L
Linus Torvalds 已提交
32 33 34 35 36 37 38 39
 *
 * Fixes:
 */

/*
 * Video4linux 1/2 integration by Justin Schoeman
 * <justin@suntiger.ee.up.ac.za>
 * 2.4 PROCFS support ported from 2.4 kernels by
40
 *  Iñaki García Etxebarria <garetxe@euskalnet.net>
L
Linus Torvalds 已提交
41 42 43 44 45 46 47 48 49 50 51 52
 * Makefile fix by "W. Michael Petullo" <mike@flyn.org>
 * 2.4 devfs support ported from 2.4 kernels by
 *  Dan Merillat <dan@merillat.org>
 * Added Gerd Knorrs v4l1 enhancements (Justin Schoeman)
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/errno.h>
53
#include <linux/i2c.h>
54 55 56
#if defined(CONFIG_SPI)
#include <linux/spi/spi.h>
#endif
L
Linus Torvalds 已提交
57 58 59 60 61
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/div64.h>
62
#define __OLD_VIDIOC_ /* To allow fixing old calls*/
63
#include <media/v4l2-common.h>
64
#include <media/v4l2-device.h>
65
#include <media/v4l2-chip-ident.h>
L
Linus Torvalds 已提交
66

67
#include <linux/videodev2.h>
L
Linus Torvalds 已提交
68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90

MODULE_AUTHOR("Bill Dirks, Justin Schoeman, Gerd Knorr");
MODULE_DESCRIPTION("misc helper functions for v4l2 device drivers");
MODULE_LICENSE("GPL");

/*
 *
 *	V 4 L 2   D R I V E R   H E L P E R   A P I
 *
 */

/*
 *  Video Standard Operations (contributed by Michael Schimek)
 */


/* ----------------------------------------------------------------- */
/* priority handling                                                 */

#define V4L2_PRIO_VALID(val) (val == V4L2_PRIORITY_BACKGROUND   || \
			      val == V4L2_PRIORITY_INTERACTIVE  || \
			      val == V4L2_PRIORITY_RECORD)

91
void v4l2_prio_init(struct v4l2_prio_state *global)
L
Linus Torvalds 已提交
92
{
93
	memset(global, 0, sizeof(*global));
L
Linus Torvalds 已提交
94
}
95
EXPORT_SYMBOL(v4l2_prio_init);
L
Linus Torvalds 已提交
96 97 98 99 100 101 102 103 104 105 106 107 108 109 110

int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
		     enum v4l2_priority new)
{
	if (!V4L2_PRIO_VALID(new))
		return -EINVAL;
	if (*local == new)
		return 0;

	atomic_inc(&global->prios[new]);
	if (V4L2_PRIO_VALID(*local))
		atomic_dec(&global->prios[*local]);
	*local = new;
	return 0;
}
111
EXPORT_SYMBOL(v4l2_prio_change);
L
Linus Torvalds 已提交
112

113
void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local)
L
Linus Torvalds 已提交
114
{
115
	v4l2_prio_change(global, local, V4L2_PRIORITY_DEFAULT);
L
Linus Torvalds 已提交
116
}
117
EXPORT_SYMBOL(v4l2_prio_open);
L
Linus Torvalds 已提交
118

119
void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local)
L
Linus Torvalds 已提交
120
{
121 122
	if (V4L2_PRIO_VALID(local))
		atomic_dec(&global->prios[local]);
L
Linus Torvalds 已提交
123
}
124
EXPORT_SYMBOL(v4l2_prio_close);
L
Linus Torvalds 已提交
125 126 127 128 129 130 131 132 133 134 135

enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global)
{
	if (atomic_read(&global->prios[V4L2_PRIORITY_RECORD]) > 0)
		return V4L2_PRIORITY_RECORD;
	if (atomic_read(&global->prios[V4L2_PRIORITY_INTERACTIVE]) > 0)
		return V4L2_PRIORITY_INTERACTIVE;
	if (atomic_read(&global->prios[V4L2_PRIORITY_BACKGROUND]) > 0)
		return V4L2_PRIORITY_BACKGROUND;
	return V4L2_PRIORITY_UNSET;
}
136
EXPORT_SYMBOL(v4l2_prio_max);
L
Linus Torvalds 已提交
137

138
int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local)
L
Linus Torvalds 已提交
139
{
140
	return (local < v4l2_prio_max(global)) ? -EBUSY : 0;
L
Linus Torvalds 已提交
141
}
142
EXPORT_SYMBOL(v4l2_prio_check);
L
Linus Torvalds 已提交
143 144 145

/* ----------------------------------------------------------------- */

146 147 148 149 150 151 152 153 154 155 156 157
/* Helper functions for control handling			     */

/* Check for correctness of the ctrl's value based on the data from
   struct v4l2_queryctrl and the available menu items. Note that
   menu_items may be NULL, in that case it is ignored. */
int v4l2_ctrl_check(struct v4l2_ext_control *ctrl, struct v4l2_queryctrl *qctrl,
		const char **menu_items)
{
	if (qctrl->flags & V4L2_CTRL_FLAG_DISABLED)
		return -EINVAL;
	if (qctrl->flags & V4L2_CTRL_FLAG_GRABBED)
		return -EBUSY;
158 159
	if (qctrl->type == V4L2_CTRL_TYPE_STRING)
		return 0;
160 161 162 163 164 165 166 167 168 169 170 171 172
	if (qctrl->type == V4L2_CTRL_TYPE_BUTTON ||
	    qctrl->type == V4L2_CTRL_TYPE_INTEGER64 ||
	    qctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS)
		return 0;
	if (ctrl->value < qctrl->minimum || ctrl->value > qctrl->maximum)
		return -ERANGE;
	if (qctrl->type == V4L2_CTRL_TYPE_MENU && menu_items != NULL) {
		if (menu_items[ctrl->value] == NULL ||
		    menu_items[ctrl->value][0] == '\0')
			return -EINVAL;
	}
	return 0;
}
173
EXPORT_SYMBOL(v4l2_ctrl_check);
174 175 176 177 178 179 180 181 182 183 184 185 186 187

/* Returns NULL or a character pointer array containing the menu for
   the given control ID. The pointer array ends with a NULL pointer.
   An empty string signifies a menu entry that is invalid. This allows
   drivers to disable certain options if it is not supported. */
const char **v4l2_ctrl_get_menu(u32 id)
{
	static const char *mpeg_audio_sampling_freq[] = {
		"44.1 kHz",
		"48 kHz",
		"32 kHz",
		NULL
	};
	static const char *mpeg_audio_encoding[] = {
188 189 190 191 192
		"MPEG-1/2 Layer I",
		"MPEG-1/2 Layer II",
		"MPEG-1/2 Layer III",
		"MPEG-2/4 AAC",
		"AC-3",
193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245
		NULL
	};
	static const char *mpeg_audio_l1_bitrate[] = {
		"32 kbps",
		"64 kbps",
		"96 kbps",
		"128 kbps",
		"160 kbps",
		"192 kbps",
		"224 kbps",
		"256 kbps",
		"288 kbps",
		"320 kbps",
		"352 kbps",
		"384 kbps",
		"416 kbps",
		"448 kbps",
		NULL
	};
	static const char *mpeg_audio_l2_bitrate[] = {
		"32 kbps",
		"48 kbps",
		"56 kbps",
		"64 kbps",
		"80 kbps",
		"96 kbps",
		"112 kbps",
		"128 kbps",
		"160 kbps",
		"192 kbps",
		"224 kbps",
		"256 kbps",
		"320 kbps",
		"384 kbps",
		NULL
	};
	static const char *mpeg_audio_l3_bitrate[] = {
		"32 kbps",
		"40 kbps",
		"48 kbps",
		"56 kbps",
		"64 kbps",
		"80 kbps",
		"96 kbps",
		"112 kbps",
		"128 kbps",
		"160 kbps",
		"192 kbps",
		"224 kbps",
		"256 kbps",
		"320 kbps",
		NULL
	};
246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267
	static const char *mpeg_audio_ac3_bitrate[] = {
		"32 kbps",
		"40 kbps",
		"48 kbps",
		"56 kbps",
		"64 kbps",
		"80 kbps",
		"96 kbps",
		"112 kbps",
		"128 kbps",
		"160 kbps",
		"192 kbps",
		"224 kbps",
		"256 kbps",
		"320 kbps",
		"384 kbps",
		"448 kbps",
		"512 kbps",
		"576 kbps",
		"640 kbps",
		NULL
	};
268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295
	static const char *mpeg_audio_mode[] = {
		"Stereo",
		"Joint Stereo",
		"Dual",
		"Mono",
		NULL
	};
	static const char *mpeg_audio_mode_extension[] = {
		"Bound 4",
		"Bound 8",
		"Bound 12",
		"Bound 16",
		NULL
	};
	static const char *mpeg_audio_emphasis[] = {
		"No Emphasis",
		"50/15 us",
		"CCITT J17",
		NULL
	};
	static const char *mpeg_audio_crc[] = {
		"No CRC",
		"16-bit CRC",
		NULL
	};
	static const char *mpeg_video_encoding[] = {
		"MPEG-1",
		"MPEG-2",
296
		"MPEG-4 AVC",
297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319
		NULL
	};
	static const char *mpeg_video_aspect[] = {
		"1x1",
		"4x3",
		"16x9",
		"2.21x1",
		NULL
	};
	static const char *mpeg_video_bitrate_mode[] = {
		"Variable Bitrate",
		"Constant Bitrate",
		NULL
	};
	static const char *mpeg_stream_type[] = {
		"MPEG-2 Program Stream",
		"MPEG-2 Transport Stream",
		"MPEG-1 System Stream",
		"MPEG-2 DVD-compatible Stream",
		"MPEG-1 VCD-compatible Stream",
		"MPEG-2 SVCD-compatible Stream",
		NULL
	};
320 321
	static const char *mpeg_stream_vbi_fmt[] = {
		"No VBI",
322
		"Private packet, IVTV format",
323 324
		NULL
	};
325 326 327 328 329 330 331 332 333 334 335 336 337
	static const char *camera_power_line_frequency[] = {
		"Disabled",
		"50 Hz",
		"60 Hz",
		NULL
	};
	static const char *camera_exposure_auto[] = {
		"Auto Mode",
		"Manual Mode",
		"Shutter Priority Mode",
		"Aperture Priority Mode",
		NULL
	};
338 339 340 341
	static const char *colorfx[] = {
		"None",
		"Black & White",
		"Sepia",
342 343 344 345 346 347 348
		"Negative",
		"Emboss",
		"Sketch",
		"Sky blue",
		"Grass green",
		"Skin whiten",
		"Vivid",
349 350
		NULL
	};
351 352 353 354 355 356
	static const char *tune_preemphasis[] = {
		"No preemphasis",
		"50 useconds",
		"75 useconds",
		NULL,
	};
357 358 359 360 361 362 363 364 365 366 367 368

	switch (id) {
		case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
			return mpeg_audio_sampling_freq;
		case V4L2_CID_MPEG_AUDIO_ENCODING:
			return mpeg_audio_encoding;
		case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
			return mpeg_audio_l1_bitrate;
		case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
			return mpeg_audio_l2_bitrate;
		case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
			return mpeg_audio_l3_bitrate;
369 370
		case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
			return mpeg_audio_ac3_bitrate;
371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386
		case V4L2_CID_MPEG_AUDIO_MODE:
			return mpeg_audio_mode;
		case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
			return mpeg_audio_mode_extension;
		case V4L2_CID_MPEG_AUDIO_EMPHASIS:
			return mpeg_audio_emphasis;
		case V4L2_CID_MPEG_AUDIO_CRC:
			return mpeg_audio_crc;
		case V4L2_CID_MPEG_VIDEO_ENCODING:
			return mpeg_video_encoding;
		case V4L2_CID_MPEG_VIDEO_ASPECT:
			return mpeg_video_aspect;
		case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
			return mpeg_video_bitrate_mode;
		case V4L2_CID_MPEG_STREAM_TYPE:
			return mpeg_stream_type;
387 388
		case V4L2_CID_MPEG_STREAM_VBI_FMT:
			return mpeg_stream_vbi_fmt;
389 390 391 392
		case V4L2_CID_POWER_LINE_FREQUENCY:
			return camera_power_line_frequency;
		case V4L2_CID_EXPOSURE_AUTO:
			return camera_exposure_auto;
393 394
		case V4L2_CID_COLORFX:
			return colorfx;
395 396
		case V4L2_CID_TUNE_PREEMPHASIS:
			return tune_preemphasis;
397 398 399 400
		default:
			return NULL;
	}
}
401
EXPORT_SYMBOL(v4l2_ctrl_get_menu);
402

403 404
/* Return the control name. */
const char *v4l2_ctrl_get_name(u32 id)
405
{
406
	switch (id) {
407
	/* USER controls */
408
	case V4L2_CID_USER_CLASS: 		return "User Controls";
409 410 411 412
	case V4L2_CID_BRIGHTNESS: 		return "Brightness";
	case V4L2_CID_CONTRAST: 		return "Contrast";
	case V4L2_CID_SATURATION: 		return "Saturation";
	case V4L2_CID_HUE: 			return "Hue";
413 414 415 416
	case V4L2_CID_AUDIO_VOLUME: 		return "Volume";
	case V4L2_CID_AUDIO_BALANCE: 		return "Balance";
	case V4L2_CID_AUDIO_BASS: 		return "Bass";
	case V4L2_CID_AUDIO_TREBLE: 		return "Treble";
417
	case V4L2_CID_AUDIO_MUTE: 		return "Mute";
418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437
	case V4L2_CID_AUDIO_LOUDNESS: 		return "Loudness";
	case V4L2_CID_BLACK_LEVEL:		return "Black Level";
	case V4L2_CID_AUTO_WHITE_BALANCE:	return "White Balance, Automatic";
	case V4L2_CID_DO_WHITE_BALANCE:		return "Do White Balance";
	case V4L2_CID_RED_BALANCE:		return "Red Balance";
	case V4L2_CID_BLUE_BALANCE:		return "Blue Balance";
	case V4L2_CID_GAMMA:			return "Gamma";
	case V4L2_CID_EXPOSURE:			return "Exposure";
	case V4L2_CID_AUTOGAIN:			return "Gain, Automatic";
	case V4L2_CID_GAIN:			return "Gain";
	case V4L2_CID_HFLIP:			return "Horizontal Flip";
	case V4L2_CID_VFLIP:			return "Vertical Flip";
	case V4L2_CID_HCENTER:			return "Horizontal Center";
	case V4L2_CID_VCENTER:			return "Vertical Center";
	case V4L2_CID_POWER_LINE_FREQUENCY:	return "Power Line Frequency";
	case V4L2_CID_HUE_AUTO:			return "Hue, Automatic";
	case V4L2_CID_WHITE_BALANCE_TEMPERATURE: return "White Balance Temperature";
	case V4L2_CID_SHARPNESS:		return "Sharpness";
	case V4L2_CID_BACKLIGHT_COMPENSATION:	return "Backlight Compensation";
	case V4L2_CID_CHROMA_AGC:		return "Chroma AGC";
438
	case V4L2_CID_CHROMA_GAIN:		return "Chroma Gain";
439
	case V4L2_CID_COLOR_KILLER:		return "Color Killer";
440
	case V4L2_CID_COLORFX:			return "Color Effects";
441 442
	case V4L2_CID_AUTOBRIGHTNESS:		return "Brightness, Automatic";
	case V4L2_CID_BAND_STOP_FILTER:		return "Band-Stop Filter";
443
	case V4L2_CID_ROTATE:			return "Rotate";
444
	case V4L2_CID_BG_COLOR:			return "Background Color";
445 446

	/* MPEG controls */
447 448 449 450 451 452
	case V4L2_CID_MPEG_CLASS: 		return "MPEG Encoder Controls";
	case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ: return "Audio Sampling Frequency";
	case V4L2_CID_MPEG_AUDIO_ENCODING: 	return "Audio Encoding";
	case V4L2_CID_MPEG_AUDIO_L1_BITRATE: 	return "Audio Layer I Bitrate";
	case V4L2_CID_MPEG_AUDIO_L2_BITRATE: 	return "Audio Layer II Bitrate";
	case V4L2_CID_MPEG_AUDIO_L3_BITRATE: 	return "Audio Layer III Bitrate";
453
	case V4L2_CID_MPEG_AUDIO_AAC_BITRATE: 	return "Audio AAC Bitrate";
454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479
	case V4L2_CID_MPEG_AUDIO_AC3_BITRATE: 	return "Audio AC-3 Bitrate";
	case V4L2_CID_MPEG_AUDIO_MODE: 		return "Audio Stereo Mode";
	case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION: return "Audio Stereo Mode Extension";
	case V4L2_CID_MPEG_AUDIO_EMPHASIS: 	return "Audio Emphasis";
	case V4L2_CID_MPEG_AUDIO_CRC: 		return "Audio CRC";
	case V4L2_CID_MPEG_AUDIO_MUTE: 		return "Audio Mute";
	case V4L2_CID_MPEG_VIDEO_ENCODING: 	return "Video Encoding";
	case V4L2_CID_MPEG_VIDEO_ASPECT: 	return "Video Aspect";
	case V4L2_CID_MPEG_VIDEO_B_FRAMES: 	return "Video B Frames";
	case V4L2_CID_MPEG_VIDEO_GOP_SIZE: 	return "Video GOP Size";
	case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE: 	return "Video GOP Closure";
	case V4L2_CID_MPEG_VIDEO_PULLDOWN: 	return "Video Pulldown";
	case V4L2_CID_MPEG_VIDEO_BITRATE_MODE: 	return "Video Bitrate Mode";
	case V4L2_CID_MPEG_VIDEO_BITRATE: 	return "Video Bitrate";
	case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK: 	return "Video Peak Bitrate";
	case V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION: return "Video Temporal Decimation";
	case V4L2_CID_MPEG_VIDEO_MUTE: 		return "Video Mute";
	case V4L2_CID_MPEG_VIDEO_MUTE_YUV:	return "Video Mute YUV";
	case V4L2_CID_MPEG_STREAM_TYPE: 	return "Stream Type";
	case V4L2_CID_MPEG_STREAM_PID_PMT: 	return "Stream PMT Program ID";
	case V4L2_CID_MPEG_STREAM_PID_AUDIO: 	return "Stream Audio Program ID";
	case V4L2_CID_MPEG_STREAM_PID_VIDEO: 	return "Stream Video Program ID";
	case V4L2_CID_MPEG_STREAM_PID_PCR: 	return "Stream PCR Program ID";
	case V4L2_CID_MPEG_STREAM_PES_ID_AUDIO: return "Stream PES Audio ID";
	case V4L2_CID_MPEG_STREAM_PES_ID_VIDEO: return "Stream PES Video ID";
	case V4L2_CID_MPEG_STREAM_VBI_FMT:	return "Stream VBI Format";
480

481 482 483 484 485 486 487 488 489 490 491 492 493 494
	/* CAMERA controls */
	case V4L2_CID_CAMERA_CLASS:		return "Camera Controls";
	case V4L2_CID_EXPOSURE_AUTO:		return "Auto Exposure";
	case V4L2_CID_EXPOSURE_ABSOLUTE:	return "Exposure Time, Absolute";
	case V4L2_CID_EXPOSURE_AUTO_PRIORITY:	return "Exposure, Dynamic Framerate";
	case V4L2_CID_PAN_RELATIVE:		return "Pan, Relative";
	case V4L2_CID_TILT_RELATIVE:		return "Tilt, Relative";
	case V4L2_CID_PAN_RESET:		return "Pan, Reset";
	case V4L2_CID_TILT_RESET:		return "Tilt, Reset";
	case V4L2_CID_PAN_ABSOLUTE:		return "Pan, Absolute";
	case V4L2_CID_TILT_ABSOLUTE:		return "Tilt, Absolute";
	case V4L2_CID_FOCUS_ABSOLUTE:		return "Focus, Absolute";
	case V4L2_CID_FOCUS_RELATIVE:		return "Focus, Relative";
	case V4L2_CID_FOCUS_AUTO:		return "Focus, Automatic";
495 496
	case V4L2_CID_IRIS_ABSOLUTE:		return "Iris, Absolute";
	case V4L2_CID_IRIS_RELATIVE:		return "Iris, Relative";
497 498 499 500 501
	case V4L2_CID_ZOOM_ABSOLUTE:		return "Zoom, Absolute";
	case V4L2_CID_ZOOM_RELATIVE:		return "Zoom, Relative";
	case V4L2_CID_ZOOM_CONTINUOUS:		return "Zoom, Continuous";
	case V4L2_CID_PRIVACY:			return "Privacy";

502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523
	/* FM Radio Modulator control */
	case V4L2_CID_FM_TX_CLASS:		return "FM Radio Modulator Controls";
	case V4L2_CID_RDS_TX_DEVIATION:		return "RDS Signal Deviation";
	case V4L2_CID_RDS_TX_PI:		return "RDS Program ID";
	case V4L2_CID_RDS_TX_PTY:		return "RDS Program Type";
	case V4L2_CID_RDS_TX_PS_NAME:		return "RDS PS Name";
	case V4L2_CID_RDS_TX_RADIO_TEXT:	return "RDS Radio Text";
	case V4L2_CID_AUDIO_LIMITER_ENABLED:	return "Audio Limiter Feature Enabled";
	case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME: return "Audio Limiter Release Time";
	case V4L2_CID_AUDIO_LIMITER_DEVIATION:	return "Audio Limiter Deviation";
	case V4L2_CID_AUDIO_COMPRESSION_ENABLED: return "Audio Compression Feature Enabled";
	case V4L2_CID_AUDIO_COMPRESSION_GAIN:	return "Audio Compression Gain";
	case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD: return "Audio Compression Threshold";
	case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME: return "Audio Compression Attack Time";
	case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME: return "Audio Compression Release Time";
	case V4L2_CID_PILOT_TONE_ENABLED:	return "Pilot Tone Feature Enabled";
	case V4L2_CID_PILOT_TONE_DEVIATION:	return "Pilot Tone Deviation";
	case V4L2_CID_PILOT_TONE_FREQUENCY:	return "Pilot Tone Frequency";
	case V4L2_CID_TUNE_PREEMPHASIS:	return "Pre-emphasis settings";
	case V4L2_CID_TUNE_POWER_LEVEL:		return "Tune Power Level";
	case V4L2_CID_TUNE_ANTENNA_CAPACITOR:	return "Tune Antenna Capacitor";

524
	default:
525
		return NULL;
526
	}
527 528 529 530 531 532 533 534 535 536 537 538
}
EXPORT_SYMBOL(v4l2_ctrl_get_name);

/* Fill in a struct v4l2_queryctrl */
int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, s32 min, s32 max, s32 step, s32 def)
{
	const char *name = v4l2_ctrl_get_name(qctrl->id);

	qctrl->flags = 0;
	if (name == NULL)
		return -EINVAL;

539 540 541
	switch (qctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	case V4L2_CID_AUDIO_LOUDNESS:
542 543 544 545 546
	case V4L2_CID_AUTO_WHITE_BALANCE:
	case V4L2_CID_AUTOGAIN:
	case V4L2_CID_HFLIP:
	case V4L2_CID_VFLIP:
	case V4L2_CID_HUE_AUTO:
547 548
	case V4L2_CID_CHROMA_AGC:
	case V4L2_CID_COLOR_KILLER:
549
	case V4L2_CID_MPEG_AUDIO_MUTE:
550
	case V4L2_CID_MPEG_VIDEO_MUTE:
551 552
	case V4L2_CID_MPEG_VIDEO_GOP_CLOSURE:
	case V4L2_CID_MPEG_VIDEO_PULLDOWN:
553
	case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
554
	case V4L2_CID_FOCUS_AUTO:
555
	case V4L2_CID_PRIVACY:
556 557 558
	case V4L2_CID_AUDIO_LIMITER_ENABLED:
	case V4L2_CID_AUDIO_COMPRESSION_ENABLED:
	case V4L2_CID_PILOT_TONE_ENABLED:
559 560 561 562
		qctrl->type = V4L2_CTRL_TYPE_BOOLEAN;
		min = 0;
		max = step = 1;
		break;
563 564 565 566 567 568
	case V4L2_CID_PAN_RESET:
	case V4L2_CID_TILT_RESET:
		qctrl->type = V4L2_CTRL_TYPE_BUTTON;
		qctrl->flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
		min = max = step = def = 0;
		break;
569
	case V4L2_CID_POWER_LINE_FREQUENCY:
570 571 572 573 574
	case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
	case V4L2_CID_MPEG_AUDIO_ENCODING:
	case V4L2_CID_MPEG_AUDIO_L1_BITRATE:
	case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
	case V4L2_CID_MPEG_AUDIO_L3_BITRATE:
575
	case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
576 577 578 579 580 581 582 583
	case V4L2_CID_MPEG_AUDIO_MODE:
	case V4L2_CID_MPEG_AUDIO_MODE_EXTENSION:
	case V4L2_CID_MPEG_AUDIO_EMPHASIS:
	case V4L2_CID_MPEG_AUDIO_CRC:
	case V4L2_CID_MPEG_VIDEO_ENCODING:
	case V4L2_CID_MPEG_VIDEO_ASPECT:
	case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
	case V4L2_CID_MPEG_STREAM_TYPE:
584
	case V4L2_CID_MPEG_STREAM_VBI_FMT:
585
	case V4L2_CID_EXPOSURE_AUTO:
586
	case V4L2_CID_COLORFX:
587
	case V4L2_CID_TUNE_PREEMPHASIS:
588 589 590
		qctrl->type = V4L2_CTRL_TYPE_MENU;
		step = 1;
		break;
591 592 593 594
	case V4L2_CID_RDS_TX_PS_NAME:
	case V4L2_CID_RDS_TX_RADIO_TEXT:
		qctrl->type = V4L2_CTRL_TYPE_STRING;
		break;
595
	case V4L2_CID_USER_CLASS:
596
	case V4L2_CID_CAMERA_CLASS:
597
	case V4L2_CID_MPEG_CLASS:
598
	case V4L2_CID_FM_TX_CLASS:
599 600 601 602
		qctrl->type = V4L2_CTRL_TYPE_CTRL_CLASS;
		qctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
		min = max = step = def = 0;
		break;
603 604 605 606 607 608 609
	case V4L2_CID_BG_COLOR:
		qctrl->type = V4L2_CTRL_TYPE_INTEGER;
		step = 1;
		min = 0;
		/* Max is calculated as RGB888 that is 2^24 */
		max = 0xFFFFFF;
		break;
610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629
	default:
		qctrl->type = V4L2_CTRL_TYPE_INTEGER;
		break;
	}
	switch (qctrl->id) {
	case V4L2_CID_MPEG_AUDIO_ENCODING:
	case V4L2_CID_MPEG_AUDIO_MODE:
	case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
	case V4L2_CID_MPEG_VIDEO_B_FRAMES:
	case V4L2_CID_MPEG_STREAM_TYPE:
		qctrl->flags |= V4L2_CTRL_FLAG_UPDATE;
		break;
	case V4L2_CID_AUDIO_VOLUME:
	case V4L2_CID_AUDIO_BALANCE:
	case V4L2_CID_AUDIO_BASS:
	case V4L2_CID_AUDIO_TREBLE:
	case V4L2_CID_BRIGHTNESS:
	case V4L2_CID_CONTRAST:
	case V4L2_CID_SATURATION:
	case V4L2_CID_HUE:
630 631 632
	case V4L2_CID_RED_BALANCE:
	case V4L2_CID_BLUE_BALANCE:
	case V4L2_CID_GAMMA:
633
	case V4L2_CID_SHARPNESS:
634
	case V4L2_CID_CHROMA_GAIN:
635 636 637 638 639 640 641 642 643 644 645
	case V4L2_CID_RDS_TX_DEVIATION:
	case V4L2_CID_AUDIO_LIMITER_RELEASE_TIME:
	case V4L2_CID_AUDIO_LIMITER_DEVIATION:
	case V4L2_CID_AUDIO_COMPRESSION_GAIN:
	case V4L2_CID_AUDIO_COMPRESSION_THRESHOLD:
	case V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME:
	case V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME:
	case V4L2_CID_PILOT_TONE_DEVIATION:
	case V4L2_CID_PILOT_TONE_FREQUENCY:
	case V4L2_CID_TUNE_POWER_LEVEL:
	case V4L2_CID_TUNE_ANTENNA_CAPACITOR:
646 647
		qctrl->flags |= V4L2_CTRL_FLAG_SLIDER;
		break;
648 649 650
	case V4L2_CID_PAN_RELATIVE:
	case V4L2_CID_TILT_RELATIVE:
	case V4L2_CID_FOCUS_RELATIVE:
651
	case V4L2_CID_IRIS_RELATIVE:
652 653 654
	case V4L2_CID_ZOOM_RELATIVE:
		qctrl->flags |= V4L2_CTRL_FLAG_WRITE_ONLY;
		break;
655 656 657 658 659 660
	}
	qctrl->minimum = min;
	qctrl->maximum = max;
	qctrl->step = step;
	qctrl->default_value = def;
	qctrl->reserved[0] = qctrl->reserved[1] = 0;
661
	strlcpy(qctrl->name, name, sizeof(qctrl->name));
662 663
	return 0;
}
664
EXPORT_SYMBOL(v4l2_ctrl_query_fill);
665 666

/* Fill in a struct v4l2_querymenu based on the struct v4l2_queryctrl and
667 668 669
   the menu. The qctrl pointer may be NULL, in which case it is ignored.
   If menu_items is NULL, then the menu items are retrieved using
   v4l2_ctrl_get_menu. */
670 671 672 673 674
int v4l2_ctrl_query_menu(struct v4l2_querymenu *qmenu, struct v4l2_queryctrl *qctrl,
	       const char **menu_items)
{
	int i;

675
	qmenu->reserved = 0;
676 677
	if (menu_items == NULL)
		menu_items = v4l2_ctrl_get_menu(qmenu->id);
678 679 680 681 682 683
	if (menu_items == NULL ||
	    (qctrl && (qmenu->index < qctrl->minimum || qmenu->index > qctrl->maximum)))
		return -EINVAL;
	for (i = 0; i < qmenu->index && menu_items[i]; i++) ;
	if (menu_items[i] == NULL || menu_items[i][0] == '\0')
		return -EINVAL;
684
	strlcpy(qmenu->name, menu_items[qmenu->index], sizeof(qmenu->name));
685 686
	return 0;
}
687
EXPORT_SYMBOL(v4l2_ctrl_query_menu);
688

689 690 691 692 693 694 695 696 697 698 699 700
/* Fill in a struct v4l2_querymenu based on the specified array of valid
   menu items (terminated by V4L2_CTRL_MENU_IDS_END).
   Use this if there are 'holes' in the list of valid menu items. */
int v4l2_ctrl_query_menu_valid_items(struct v4l2_querymenu *qmenu, const u32 *ids)
{
	const char **menu_items = v4l2_ctrl_get_menu(qmenu->id);

	qmenu->reserved = 0;
	if (menu_items == NULL || ids == NULL)
		return -EINVAL;
	while (*ids != V4L2_CTRL_MENU_IDS_END) {
		if (*ids++ == qmenu->index) {
701 702
			strlcpy(qmenu->name, menu_items[qmenu->index],
					sizeof(qmenu->name));
703 704 705 706 707 708 709
			return 0;
		}
	}
	return -EINVAL;
}
EXPORT_SYMBOL(v4l2_ctrl_query_menu_valid_items);

710 711 712
/* ctrl_classes points to an array of u32 pointers, the last element is
   a NULL pointer. Each u32 array is a 0-terminated array of control IDs.
   Each array must be sorted low to high and belong to the same control
713
   class. The array of u32 pointers must also be sorted, from low class IDs
714 715 716 717 718 719
   to high class IDs.

   This function returns the first ID that follows after the given ID.
   When no more controls are available 0 is returned. */
u32 v4l2_ctrl_next(const u32 * const * ctrl_classes, u32 id)
{
720
	u32 ctrl_class = V4L2_CTRL_ID2CLASS(id);
721 722 723 724
	const u32 *pctrl;

	if (ctrl_classes == NULL)
		return 0;
725 726 727 728 729 730 731 732 733 734 735 736 737

	/* if no query is desired, then check if the ID is part of ctrl_classes */
	if ((id & V4L2_CTRL_FLAG_NEXT_CTRL) == 0) {
		/* find class */
		while (*ctrl_classes && V4L2_CTRL_ID2CLASS(**ctrl_classes) != ctrl_class)
			ctrl_classes++;
		if (*ctrl_classes == NULL)
			return 0;
		pctrl = *ctrl_classes;
		/* find control ID */
		while (*pctrl && *pctrl != id) pctrl++;
		return *pctrl ? id : 0;
	}
738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758
	id &= V4L2_CTRL_ID_MASK;
	id++;	/* select next control */
	/* find first class that matches (or is greater than) the class of
	   the ID */
	while (*ctrl_classes && V4L2_CTRL_ID2CLASS(**ctrl_classes) < ctrl_class)
		ctrl_classes++;
	/* no more classes */
	if (*ctrl_classes == NULL)
		return 0;
	pctrl = *ctrl_classes;
	/* find first ctrl within the class that is >= ID */
	while (*pctrl && *pctrl < id) pctrl++;
	if (*pctrl)
		return *pctrl;
	/* we are at the end of the controls of the current class. */
	/* continue with next class if available */
	ctrl_classes++;
	if (*ctrl_classes == NULL)
		return 0;
	return **ctrl_classes;
}
759
EXPORT_SYMBOL(v4l2_ctrl_next);
760

761
int v4l2_chip_match_host(const struct v4l2_dbg_match *match)
762
{
763
	switch (match->type) {
764
	case V4L2_CHIP_MATCH_HOST:
765
		return match->addr == 0;
766 767 768 769 770 771 772
	default:
		return 0;
	}
}
EXPORT_SYMBOL(v4l2_chip_match_host);

#if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
773
int v4l2_chip_match_i2c_client(struct i2c_client *c, const struct v4l2_dbg_match *match)
774
{
775 776 777 778 779 780
	int len;

	if (c == NULL || match == NULL)
		return 0;

	switch (match->type) {
781
	case V4L2_CHIP_MATCH_I2C_DRIVER:
782 783 784 785 786 787 788
		if (c->driver == NULL || c->driver->driver.name == NULL)
			return 0;
		len = strlen(c->driver->driver.name);
		/* legacy drivers have a ' suffix, don't try to match that */
		if (len && c->driver->driver.name[len - 1] == '\'')
			len--;
		return len && !strncmp(c->driver->driver.name, match->name, len);
789
	case V4L2_CHIP_MATCH_I2C_ADDR:
790
		return c->addr == match->addr;
791 792 793 794
	default:
		return 0;
	}
}
795
EXPORT_SYMBOL(v4l2_chip_match_i2c_client);
796

797
int v4l2_chip_ident_i2c_client(struct i2c_client *c, struct v4l2_dbg_chip_ident *chip,
798 799
		u32 ident, u32 revision)
{
800
	if (!v4l2_chip_match_i2c_client(c, &chip->match))
801 802 803 804 805 806 807 808 809 810 811
		return 0;
	if (chip->ident == V4L2_IDENT_NONE) {
		chip->ident = ident;
		chip->revision = revision;
	}
	else {
		chip->ident = V4L2_IDENT_AMBIGUOUS;
		chip->revision = 0;
	}
	return 0;
}
812
EXPORT_SYMBOL(v4l2_chip_ident_i2c_client);
813

814 815
/* ----------------------------------------------------------------- */

816
/* I2C Helper functions */
817

818 819 820 821 822

void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
		const struct v4l2_subdev_ops *ops)
{
	v4l2_subdev_init(sd, ops);
823
	sd->flags |= V4L2_SUBDEV_FL_IS_I2C;
824 825 826 827 828 829 830 831 832 833 834 835 836 837
	/* the owner is the same as the i2c_client's driver owner */
	sd->owner = client->driver->driver.owner;
	/* i2c_client and v4l2_subdev point to one another */
	v4l2_set_subdevdata(sd, client);
	i2c_set_clientdata(client, sd);
	/* initialize name */
	snprintf(sd->name, sizeof(sd->name), "%s %d-%04x",
		client->driver->driver.name, i2c_adapter_id(client->adapter),
		client->addr);
}
EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_init);



838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920
/* Load an i2c sub-device. */
struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
		struct i2c_adapter *adapter, const char *module_name,
		struct i2c_board_info *info, const unsigned short *probe_addrs)
{
	struct v4l2_subdev *sd = NULL;
	struct i2c_client *client;

	BUG_ON(!v4l2_dev);

	if (module_name)
		request_module(module_name);

	/* Create the i2c client */
	if (info->addr == 0 && probe_addrs)
		client = i2c_new_probed_device(adapter, info, probe_addrs);
	else
		client = i2c_new_device(adapter, info);

	/* Note: by loading the module first we are certain that c->driver
	   will be set if the driver was found. If the module was not loaded
	   first, then the i2c core tries to delay-load the module for us,
	   and then c->driver is still NULL until the module is finally
	   loaded. This delay-load mechanism doesn't work if other drivers
	   want to use the i2c device, so explicitly loading the module
	   is the best alternative. */
	if (client == NULL || client->driver == NULL)
		goto error;

	/* Lock the module so we can safely get the v4l2_subdev pointer */
	if (!try_module_get(client->driver->driver.owner))
		goto error;
	sd = i2c_get_clientdata(client);

	/* Register with the v4l2_device which increases the module's
	   use count as well. */
	if (v4l2_device_register_subdev(v4l2_dev, sd))
		sd = NULL;
	/* Decrease the module use count to match the first try_module_get. */
	module_put(client->driver->driver.owner);

	if (sd) {
		/* We return errors from v4l2_subdev_call only if we have the
		   callback as the .s_config is not mandatory */
		int err = v4l2_subdev_call(sd, core, s_config,
				info->irq, info->platform_data);

		if (err && err != -ENOIOCTLCMD) {
			v4l2_device_unregister_subdev(sd);
			sd = NULL;
		}
	}

error:
	/* If we have a client but no subdev, then something went wrong and
	   we must unregister the client. */
	if (client && sd == NULL)
		i2c_unregister_device(client);
	return sd;
}
EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev_board);

struct v4l2_subdev *v4l2_i2c_new_subdev_cfg(struct v4l2_device *v4l2_dev,
		struct i2c_adapter *adapter,
		const char *module_name, const char *client_type,
		int irq, void *platform_data,
		u8 addr, const unsigned short *probe_addrs)
{
	struct i2c_board_info info;

	/* Setup the i2c board info with the device type and
	   the device address. */
	memset(&info, 0, sizeof(info));
	strlcpy(info.type, client_type, sizeof(info.type));
	info.addr = addr;
	info.irq = irq;
	info.platform_data = platform_data;

	return v4l2_i2c_new_subdev_board(v4l2_dev, adapter, module_name,
			&info, probe_addrs);
}
EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev_cfg);

921 922 923 924 925 926 927 928 929
/* Return i2c client address of v4l2_subdev. */
unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	return client ? client->addr : I2C_CLIENT_END;
}
EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_addr);

930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946
/* Return a list of I2C tuner addresses to probe. Use only if the tuner
   addresses are unknown. */
const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type)
{
	static const unsigned short radio_addrs[] = {
#if defined(CONFIG_MEDIA_TUNER_TEA5761) || defined(CONFIG_MEDIA_TUNER_TEA5761_MODULE)
		0x10,
#endif
		0x60,
		I2C_CLIENT_END
	};
	static const unsigned short demod_addrs[] = {
		0x42, 0x43, 0x4a, 0x4b,
		I2C_CLIENT_END
	};
	static const unsigned short tv_addrs[] = {
		0x42, 0x43, 0x4a, 0x4b,		/* tda8290 */
947
		0x60, 0x61, 0x62, 0x63, 0x64,
948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964
		I2C_CLIENT_END
	};

	switch (type) {
	case ADDRS_RADIO:
		return radio_addrs;
	case ADDRS_DEMOD:
		return demod_addrs;
	case ADDRS_TV:
		return tv_addrs;
	case ADDRS_TV_WITH_DEMOD:
		return tv_addrs + 4;
	}
	return NULL;
}
EXPORT_SYMBOL_GPL(v4l2_i2c_tuner_addrs);

965 966
#endif /* defined(CONFIG_I2C) */

967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026
#if defined(CONFIG_SPI)

/* Load a spi sub-device. */

void v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi,
		const struct v4l2_subdev_ops *ops)
{
	v4l2_subdev_init(sd, ops);
	sd->flags |= V4L2_SUBDEV_FL_IS_SPI;
	/* the owner is the same as the spi_device's driver owner */
	sd->owner = spi->dev.driver->owner;
	/* spi_device and v4l2_subdev point to one another */
	v4l2_set_subdevdata(sd, spi);
	spi_set_drvdata(spi, sd);
	/* initialize name */
	strlcpy(sd->name, spi->dev.driver->name, sizeof(sd->name));
}
EXPORT_SYMBOL_GPL(v4l2_spi_subdev_init);

struct v4l2_subdev *v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev,
		struct spi_master *master, struct spi_board_info *info)
{
	struct v4l2_subdev *sd = NULL;
	struct spi_device *spi = NULL;

	BUG_ON(!v4l2_dev);

	if (info->modalias)
		request_module(info->modalias);

	spi = spi_new_device(master, info);

	if (spi == NULL || spi->dev.driver == NULL)
		goto error;

	if (!try_module_get(spi->dev.driver->owner))
		goto error;

	sd = spi_get_drvdata(spi);

	/* Register with the v4l2_device which increases the module's
	   use count as well. */
	if (v4l2_device_register_subdev(v4l2_dev, sd))
		sd = NULL;

	/* Decrease the module use count to match the first try_module_get. */
	module_put(spi->dev.driver->owner);

error:
	/* If we have a client but no subdev, then something went wrong and
	   we must unregister the client. */
	if (spi && sd == NULL)
		spi_unregister_device(spi);

	return sd;
}
EXPORT_SYMBOL_GPL(v4l2_spi_new_subdev);

#endif /* defined(CONFIG_SPI) */

1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099
/* Clamp x to be between min and max, aligned to a multiple of 2^align.  min
 * and max don't have to be aligned, but there must be at least one valid
 * value.  E.g., min=17,max=31,align=4 is not allowed as there are no multiples
 * of 16 between 17 and 31.  */
static unsigned int clamp_align(unsigned int x, unsigned int min,
				unsigned int max, unsigned int align)
{
	/* Bits that must be zero to be aligned */
	unsigned int mask = ~((1 << align) - 1);

	/* Round to nearest aligned value */
	if (align)
		x = (x + (1 << (align - 1))) & mask;

	/* Clamp to aligned value of min and max */
	if (x < min)
		x = (min + ~mask) & mask;
	else if (x > max)
		x = max & mask;

	return x;
}

/* Bound an image to have a width between wmin and wmax, and height between
 * hmin and hmax, inclusive.  Additionally, the width will be a multiple of
 * 2^walign, the height will be a multiple of 2^halign, and the overall size
 * (width*height) will be a multiple of 2^salign.  The image may be shrunk
 * or enlarged to fit the alignment constraints.
 *
 * The width or height maximum must not be smaller than the corresponding
 * minimum.  The alignments must not be so high there are no possible image
 * sizes within the allowed bounds.  wmin and hmin must be at least 1
 * (don't use 0).  If you don't care about a certain alignment, specify 0,
 * as 2^0 is 1 and one byte alignment is equivalent to no alignment.  If
 * you only want to adjust downward, specify a maximum that's the same as
 * the initial value.
 */
void v4l_bound_align_image(u32 *w, unsigned int wmin, unsigned int wmax,
			   unsigned int walign,
			   u32 *h, unsigned int hmin, unsigned int hmax,
			   unsigned int halign, unsigned int salign)
{
	*w = clamp_align(*w, wmin, wmax, walign);
	*h = clamp_align(*h, hmin, hmax, halign);

	/* Usually we don't need to align the size and are done now. */
	if (!salign)
		return;

	/* How much alignment do we have? */
	walign = __ffs(*w);
	halign = __ffs(*h);
	/* Enough to satisfy the image alignment? */
	if (walign + halign < salign) {
		/* Max walign where there is still a valid width */
		unsigned int wmaxa = __fls(wmax ^ (wmin - 1));
		/* Max halign where there is still a valid height */
		unsigned int hmaxa = __fls(hmax ^ (hmin - 1));

		/* up the smaller alignment until we have enough */
		do {
			if (halign >= hmaxa ||
			    (walign <= halign && walign < wmaxa)) {
				*w = clamp_align(*w, wmin, wmax, walign + 1);
				walign = __ffs(*w);
			} else {
				*h = clamp_align(*h, hmin, hmax, halign + 1);
				halign = __ffs(*h);
			}
		} while (halign + walign < salign);
	}
}
EXPORT_SYMBOL_GPL(v4l_bound_align_image);
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146

/**
 * v4l_fill_dv_preset_info - fill description of a digital video preset
 * @preset - preset value
 * @info - pointer to struct v4l2_dv_enum_preset
 *
 * drivers can use this helper function to fill description of dv preset
 * in info.
 */
int v4l_fill_dv_preset_info(u32 preset, struct v4l2_dv_enum_preset *info)
{
	static const struct v4l2_dv_preset_info {
		u16 width;
		u16 height;
		const char *name;
	} dv_presets[] = {
		{ 0, 0, "Invalid" },		/* V4L2_DV_INVALID */
		{ 720,  480, "480p@59.94" },	/* V4L2_DV_480P59_94 */
		{ 720,  576, "576p@50" },	/* V4L2_DV_576P50 */
		{ 1280, 720, "720p@24" },	/* V4L2_DV_720P24 */
		{ 1280, 720, "720p@25" },	/* V4L2_DV_720P25 */
		{ 1280, 720, "720p@30" },	/* V4L2_DV_720P30 */
		{ 1280, 720, "720p@50" },	/* V4L2_DV_720P50 */
		{ 1280, 720, "720p@59.94" },	/* V4L2_DV_720P59_94 */
		{ 1280, 720, "720p@60" },	/* V4L2_DV_720P60 */
		{ 1920, 1080, "1080i@29.97" },	/* V4L2_DV_1080I29_97 */
		{ 1920, 1080, "1080i@30" },	/* V4L2_DV_1080I30 */
		{ 1920, 1080, "1080i@25" },	/* V4L2_DV_1080I25 */
		{ 1920, 1080, "1080i@50" },	/* V4L2_DV_1080I50 */
		{ 1920, 1080, "1080i@60" },	/* V4L2_DV_1080I60 */
		{ 1920, 1080, "1080p@24" },	/* V4L2_DV_1080P24 */
		{ 1920, 1080, "1080p@25" },	/* V4L2_DV_1080P25 */
		{ 1920, 1080, "1080p@30" },	/* V4L2_DV_1080P30 */
		{ 1920, 1080, "1080p@50" },	/* V4L2_DV_1080P50 */
		{ 1920, 1080, "1080p@60" },	/* V4L2_DV_1080P60 */
	};

	if (info == NULL || preset >= ARRAY_SIZE(dv_presets))
		return -EINVAL;

	info->preset = preset;
	info->width = dv_presets[preset].width;
	info->height = dv_presets[preset].height;
	strlcpy(info->name, dv_presets[preset].name, sizeof(info->name));
	return 0;
}
EXPORT_SYMBOL_GPL(v4l_fill_dv_preset_info);