summaryrefslogtreecommitdiffstats
path: root/include/media/v4l2-common.h
blob: d8c29e0890009a29000c58117a621e4a2624244b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
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
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
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
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
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
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
    v4l2 common internal API header

    This header contains internal shared ioctl definitions for use by the
    internal low-level v4l2 drivers.
    Each ioctl begins with VIDIOC_INT_ to clearly mark that it is an internal
    define,

    Copyright (C) 2005  Hans Verkuil <hverkuil@xs4all.nl>

 */

#ifndef V4L2_COMMON_H_
#define V4L2_COMMON_H_

#include <media/v4l2-dev.h>

/* Common printk constructs for v4l-i2c drivers. These macros create a unique
   prefix consisting of the driver name, the adapter number and the i2c
   address. */
#define v4l_printk(level, name, adapter, addr, fmt, arg...) \
	printk(level "%s %d-%04x: " fmt, name, i2c_adapter_id(adapter), addr , ## arg)

#define v4l_client_printk(level, client, fmt, arg...)			    \
	v4l_printk(level, (client)->dev.driver->name, (client)->adapter, \
		   (client)->addr, fmt , ## arg)

#define v4l_err(client, fmt, arg...) \
	v4l_client_printk(KERN_ERR, client, fmt , ## arg)

#define v4l_warn(client, fmt, arg...) \
	v4l_client_printk(KERN_WARNING, client, fmt , ## arg)

#define v4l_info(client, fmt, arg...) \
	v4l_client_printk(KERN_INFO, client, fmt , ## arg)

/* These three macros assume that the debug level is set with a module
   parameter called 'debug'. */
#define v4l_dbg(level, debug, client, fmt, arg...)			     \
	do {								     \
		if (debug >= (level))					     \
			v4l_client_printk(KERN_DEBUG, client, fmt , ## arg); \
	} while (0)

/* Add a version of v4l_dbg to be used on drivers using dev_foo() macros */
#define dev_dbg_lvl(__dev, __level, __debug, __fmt, __arg...)		\
	do {								\
		if (__debug >= (__level))				\
			dev_printk(KERN_DEBUG, __dev, __fmt, ##__arg);	\
	} while (0)

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

/* These printk constructs can be used with v4l2_device and v4l2_subdev */
#define v4l2_printk(level, dev, fmt, arg...) \
	printk(level "%s: " fmt, (dev)->name , ## arg)

#define v4l2_err(dev, fmt, arg...) \
	v4l2_printk(KERN_ERR, dev, fmt , ## arg)

#define v4l2_warn(dev, fmt, arg...) \
	v4l2_printk(KERN_WARNING, dev, fmt , ## arg)

#define v4l2_info(dev, fmt, arg...) \
	v4l2_printk(KERN_INFO, dev, fmt , ## arg)

/* These three macros assume that the debug level is set with a module
   parameter called 'debug'. */
#define v4l2_dbg(level, debug, dev, fmt, arg...)			\
	do {								\
		if (debug >= (level))					\
			v4l2_printk(KERN_DEBUG, dev, fmt , ## arg);	\
	} while (0)

/**
 * v4l2_ctrl_query_fill- Fill in a struct v4l2_queryctrl
 *
 * @qctrl: pointer to the &struct v4l2_queryctrl to be filled
 * @min: minimum value for the control
 * @max: maximum value for the control
 * @step: control step
 * @def: default value for the control
 *
 * Fills the &struct v4l2_queryctrl fields for the query control.
 *
 * .. note::
 *
 *    This function assumes that the @qctrl->id field is filled.
 *
 * Returns -EINVAL if the control is not known by the V4L2 core, 0 on success.
 */

int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl,
			 s32 min, s32 max, s32 step, s32 def);

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

struct v4l2_device;
struct v4l2_subdev;
struct v4l2_subdev_ops;

/* I2C Helper functions */
#include <linux/i2c.h>

/**
 * enum v4l2_i2c_tuner_type - specifies the range of tuner address that
 *	should be used when seeking for I2C devices.
 *
 * @ADDRS_RADIO:		Radio tuner addresses.
 *				Represent the following I2C addresses:
 *				0x10 (if compiled with tea5761 support)
 *				and 0x60.
 * @ADDRS_DEMOD:		Demod tuner addresses.
 *				Represent the following I2C addresses:
 *				0x42, 0x43, 0x4a and 0x4b.
 * @ADDRS_TV:			TV tuner addresses.
 *				Represent the following I2C addresses:
 *				0x42, 0x43, 0x4a, 0x4b, 0x60, 0x61, 0x62,
 *				0x63 and 0x64.
 * @ADDRS_TV_WITH_DEMOD:	TV tuner addresses if demod is present, this
 *				excludes addresses used by the demodulator
 *				from the list of candidates.
 *				Represent the following I2C addresses:
 *				0x60, 0x61, 0x62, 0x63 and 0x64.
 *
 * NOTE: All I2C addresses above use the 7-bit notation.
 */
enum v4l2_i2c_tuner_type {
	ADDRS_RADIO,
	ADDRS_DEMOD,
	ADDRS_TV,
	ADDRS_TV_WITH_DEMOD,
};

#if defined(CONFIG_VIDEO_V4L2_I2C)

/**
 * v4l2_i2c_new_subdev - Load an i2c module and return an initialized
 *	&struct v4l2_subdev.
 *
 * @v4l2_dev: pointer to &struct v4l2_device
 * @adapter: pointer to struct i2c_adapter
 * @client_type:  name of the chip that's on the adapter.
 * @addr: I2C address. If zero, it will use @probe_addrs
 * @probe_addrs: array with a list of address. The last entry at such
 *	array should be %I2C_CLIENT_END.
 *
 * returns a &struct v4l2_subdev pointer.
 */
struct v4l2_subdev *v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev,
		struct i2c_adapter *adapter, const char *client_type,
		u8 addr, const unsigned short *probe_addrs);

/**
 * v4l2_i2c_new_subdev_board - Load an i2c module and return an initialized
 *	&struct v4l2_subdev.
 *
 * @v4l2_dev: pointer to &struct v4l2_device
 * @adapter: pointer to struct i2c_adapter
 * @info: pointer to struct i2c_board_info used to replace the irq,
 *	 platform_data and addr arguments.
 * @probe_addrs: array with a list of address. The last entry at such
 *	array should be %I2C_CLIENT_END.
 *
 * returns a &struct v4l2_subdev pointer.
 */
struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
		struct i2c_adapter *adapter, struct i2c_board_info *info,
		const unsigned short *probe_addrs);

/**
 * v4l2_i2c_subdev_set_name - Set name for an I²C sub-device
 *
 * @sd: pointer to &struct v4l2_subdev
 * @client: pointer to struct i2c_client
 * @devname: the name of the device; if NULL, the I²C device's name will be used
 * @postfix: sub-device specific string to put right after the I²C device name;
 *	     may be NULL
 */
void v4l2_i2c_subdev_set_name(struct v4l2_subdev *sd, struct i2c_client *client,
			      const char *devname, const char *postfix);

/**
 * v4l2_i2c_subdev_init - Initializes a &struct v4l2_subdev with data from
 *	an i2c_client struct.
 *
 * @sd: pointer to &struct v4l2_subdev
 * @client: pointer to struct i2c_client
 * @ops: pointer to &struct v4l2_subdev_ops
 */
void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
		const struct v4l2_subdev_ops *ops);

/**
 * v4l2_i2c_subdev_addr - returns i2c client address of &struct v4l2_subdev.
 *
 * @sd: pointer to &struct v4l2_subdev
 *
 * Returns the address of an I2C sub-device
 */
unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd);

/**
 * v4l2_i2c_tuner_addrs - Return a list of I2C tuner addresses to probe.
 *
 * @type: type of the tuner to seek, as defined by
 *	  &enum v4l2_i2c_tuner_type.
 *
 * NOTE: Use only if the tuner addresses are unknown.
 */
const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type);

/**
 * v4l2_i2c_subdev_unregister - Unregister a v4l2_subdev
 *
 * @sd: pointer to &struct v4l2_subdev
 */
void v4l2_i2c_subdev_unregister(struct v4l2_subdev *sd);

#else

static inline struct v4l2_subdev *
v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev,
		    struct i2c_adapter *adapter, const char *client_type,
		    u8 addr, const unsigned short *probe_addrs)
{
	return NULL;
}

static inline struct v4l2_subdev *
v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
			  struct i2c_adapter *adapter, struct i2c_board_info *info,
			  const unsigned short *probe_addrs)
{
	return NULL;
}

static inline void
v4l2_i2c_subdev_set_name(struct v4l2_subdev *sd, struct i2c_client *client,
			 const char *devname, const char *postfix)
{}

static inline void
v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
		     const struct v4l2_subdev_ops *ops)
{}

static inline unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd)
{
	return I2C_CLIENT_END;
}

static inline const unsigned short *
v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type)
{
	return NULL;
}

static inline void v4l2_i2c_subdev_unregister(struct v4l2_subdev *sd)
{}

#endif

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

/* SPI Helper functions */

#include <linux/spi/spi.h>

#if defined(CONFIG_SPI)

/**
 *  v4l2_spi_new_subdev - Load an spi module and return an initialized
 *	&struct v4l2_subdev.
 *
 *
 * @v4l2_dev: pointer to &struct v4l2_device.
 * @master: pointer to struct spi_master.
 * @info: pointer to struct spi_board_info.
 *
 * returns a &struct v4l2_subdev pointer.
 */
struct v4l2_subdev *v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev,
		struct spi_master *master, struct spi_board_info *info);

/**
 * v4l2_spi_subdev_init - Initialize a v4l2_subdev with data from an
 *	spi_device struct.
 *
 * @sd: pointer to &struct v4l2_subdev
 * @spi: pointer to struct spi_device.
 * @ops: pointer to &struct v4l2_subdev_ops
 */
void v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi,
		const struct v4l2_subdev_ops *ops);

/**
 * v4l2_spi_subdev_unregister - Unregister a v4l2_subdev
 *
 * @sd: pointer to &struct v4l2_subdev
 */
void v4l2_spi_subdev_unregister(struct v4l2_subdev *sd);

#else

static inline struct v4l2_subdev *
v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev,
		    struct spi_master *master, struct spi_board_info *info)
{
	return NULL;
}

static inline void
v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi,
		     const struct v4l2_subdev_ops *ops)
{}

static inline void v4l2_spi_subdev_unregister(struct v4l2_subdev *sd)
{}
#endif

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

/*
 * FIXME: these remaining ioctls/structs should be removed as well, but they
 * are still used in tuner-simple.c (TUNER_SET_CONFIG) and cx18/ivtv (RESET).
 * To remove these ioctls some more cleanup is needed in those modules.
 *
 * It doesn't make much sense on documenting them, as what we really want is
 * to get rid of them.
 */

/* s_config */
struct v4l2_priv_tun_config {
	int tuner;
	void *priv;
};
#define TUNER_SET_CONFIG           _IOW('d', 92, struct v4l2_priv_tun_config)

#define VIDIOC_INT_RESET		_IOW ('d', 102, u32)

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

/* Miscellaneous helper functions */

/**
 * v4l_bound_align_image - adjust video dimensions according to
 *	a given constraints.
 *
 * @width:	pointer to width that will be adjusted if needed.
 * @wmin:	minimum width.
 * @wmax:	maximum width.
 * @walign:	least significant bit on width.
 * @height:	pointer to height that will be adjusted if needed.
 * @hmin:	minimum height.
 * @hmax:	maximum height.
 * @halign:	least significant bit on height.
 * @salign:	least significant bit for the image size (e. g.
 *		:math:`width * height`).
 *
 * Clip an image to have @width between @wmin and @wmax, and @height between
 * @hmin and @hmax, inclusive.
 *
 * Additionally, the @width will be a multiple of :math:`2^{walign}`,
 * the @height will be a multiple of :math:`2^{halign}`, and the overall
 * size :math:`width * height` will be a multiple of :math:`2^{salign}`.
 *
 * .. note::
 *
 *    #. The clipping rectangle may be shrunk or enlarged to fit the alignment
 *       constraints.
 *    #. @wmax must not be smaller than @wmin.
 *    #. @hmax must not be smaller than @hmin.
 *    #. 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).
 *    #. For @walign, @halign and @salign, if you don't care about a certain
 *       alignment, specify ``0``, as :math:`2^0 = 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(unsigned int *width, unsigned int wmin,
			   unsigned int wmax, unsigned int walign,
			   unsigned int *height, unsigned int hmin,
			   unsigned int hmax, unsigned int halign,
			   unsigned int salign);

/**
 * v4l2_find_nearest_size - Find the nearest size among a discrete
 *	set of resolutions contained in an array of a driver specific struct.
 *
 * @array: a driver specific array of image sizes
 * @array_size: the length of the driver specific array of image sizes
 * @width_field: the name of the width field in the driver specific struct
 * @height_field: the name of the height field in the driver specific struct
 * @width: desired width.
 * @height: desired height.
 *
 * Finds the closest resolution to minimize the width and height differences
 * between what requested and the supported resolutions. The size of the width
 * and height fields in the driver specific must equal to that of u32, i.e. four
 * bytes.
 *
 * Returns the best match or NULL if the length of the array is zero.
 */
#define v4l2_find_nearest_size(array, array_size, width_field, height_field, \
			       width, height)				\
	({								\
		BUILD_BUG_ON(sizeof((array)->width_field) != sizeof(u32) || \
			     sizeof((array)->height_field) != sizeof(u32)); \
		(typeof(&(array)[0]))__v4l2_find_nearest_size(		\
			(array), array_size, sizeof(*(array)),		\
			offsetof(typeof(*(array)), width_field),	\
			offsetof(typeof(*(array)), height_field),	\
			width, height);					\
	})
const void *
__v4l2_find_nearest_size(const void *array, size_t array_size,
			 size_t entry_size, size_t width_offset,
			 size_t height_offset, s32 width, s32 height);

/**
 * v4l2_g_parm_cap - helper routine for vidioc_g_parm to fill this in by
 *      calling the g_frame_interval op of the given subdev. It only works
 *      for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the
 *      function name.
 *
 * @vdev: the struct video_device pointer. Used to determine the device caps.
 * @sd: the sub-device pointer.
 * @a: the VIDIOC_G_PARM argument.
 */
int v4l2_g_parm_cap(struct video_device *vdev,
		    struct v4l2_subdev *sd, struct v4l2_streamparm *a);

/**
 * v4l2_s_parm_cap - helper routine for vidioc_s_parm to fill this in by
 *      calling the s_frame_interval op of the given subdev. It only works
 *      for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the
 *      function name.
 *
 * @vdev: the struct video_device pointer. Used to determine the device caps.
 * @sd: the sub-device pointer.
 * @a: the VIDIOC_S_PARM argument.
 */
int v4l2_s_parm_cap(struct video_device *vdev,
		    struct v4l2_subdev *sd, struct v4l2_streamparm *a);

/* Compare two v4l2_fract structs */
#define V4L2_FRACT_COMPARE(a, OP, b)			\
	((u64)(a).numerator * (b).denominator OP	\
	(u64)(b).numerator * (a).denominator)

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

/* Pixel format and FourCC helpers */

/**
 * enum v4l2_pixel_encoding - specifies the pixel encoding value
 *
 * @V4L2_PIXEL_ENC_UNKNOWN:	Pixel encoding is unknown/un-initialized
 * @V4L2_PIXEL_ENC_YUV:		Pixel encoding is YUV
 * @V4L2_PIXEL_ENC_RGB:		Pixel encoding is RGB
 * @V4L2_PIXEL_ENC_BAYER:	Pixel encoding is Bayer
 */
enum v4l2_pixel_encoding {
	V4L2_PIXEL_ENC_UNKNOWN = 0,
	V4L2_PIXEL_ENC_YUV = 1,
	V4L2_PIXEL_ENC_RGB = 2,
	V4L2_PIXEL_ENC_BAYER = 3,
};

/**
 * struct v4l2_format_info - information about a V4L2 format
 * @format: 4CC format identifier (V4L2_PIX_FMT_*)
 * @pixel_enc: Pixel encoding (see enum v4l2_pixel_encoding above)
 * @mem_planes: Number of memory planes, which includes the alpha plane (1 to 4).
 * @comp_planes: Number of component planes, which includes the alpha plane (1 to 4).
 * @bpp: Array of per-plane bytes per pixel
 * @hdiv: Horizontal chroma subsampling factor
 * @vdiv: Vertical chroma subsampling factor
 * @block_w: Per-plane macroblock pixel width (optional)
 * @block_h: Per-plane macroblock pixel height (optional)
 */
struct v4l2_format_info {
	u32 format;
	u8 pixel_enc;
	u8 mem_planes;
	u8 comp_planes;
	u8 bpp[4];
	u8 hdiv;
	u8 vdiv;
	u8 block_w[4];
	u8 block_h[4];
};

static inline bool v4l2_is_format_rgb(const struct v4l2_format_info *f)
{
	return f && f->pixel_enc == V4L2_PIXEL_ENC_RGB;
}

static inline bool v4l2_is_format_yuv(const struct v4l2_format_info *f)
{
	return f && f->pixel_enc == V4L2_PIXEL_ENC_YUV;
}

static inline bool v4l2_is_format_bayer(const struct v4l2_format_info *f)
{
	return f && f->pixel_enc == V4L2_PIXEL_ENC_BAYER;
}

const struct v4l2_format_info *v4l2_format_info(u32 format);
void v4l2_apply_frmsize_constraints(u32 *width, u32 *height,
				    const struct v4l2_frmsize_stepwise *frmsize);
int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, u32 pixelformat,
		     u32 width, u32 height);
int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, u32 pixelformat,
			u32 width, u32 height);

#endif /* V4L2_COMMON_H_ */