[mirror_ubuntu-hirsute-kernel.git] / include / media / v4l2-common.h

/*
    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>

    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.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#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);

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

/* I2C Helper functions */

struct i2c_driver;
struct i2c_adapter;
struct i2c_client;
struct i2c_device_id;
struct v4l2_device;
struct v4l2_subdev;
struct v4l2_subdev_ops;

/**
 * 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);

struct i2c_board_info;

/**
 * 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);

/**
 * 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,
};
/**
 * 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);

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

/* SPI Helper functions */
#if defined(CONFIG_SPI)

#include <linux/spi/spi.h>

struct spi_device;

/**
 *  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);
#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 */

/**
 * struct v4l2_format_info - information about a V4L2 format
 * @format: 4CC format identifier (V4L2_PIX_FMT_*)
 * @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 mem_planes;
	u8 comp_planes;
	u8 bpp[4];
	u8 hdiv;
	u8 vdiv;
	u8 block_w[4];
	u8 block_h[4];
};

const struct v4l2_format_info *v4l2_format_info(u32 format);

int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, int pixelformat,
		     int width, int height);
int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, int pixelformat,
			int width, int height);

#endif /* V4L2_COMMON_H_ */
Commit	Line	Data
b2f0648f HV	1	/*
	2	v4l2 common internal API header
	3
	4	This header contains internal shared ioctl definitions for use by the
	5	internal low-level v4l2 drivers.
	6	Each ioctl begins with VIDIOC_INT_ to clearly mark that it is an internal
	7	define,
	8
	9	Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
	10
	11	This program is free software; you can redistribute it and/or modify
	12	it under the terms of the GNU General Public License as published by
	13	the Free Software Foundation; either version 2 of the License, or
	14	(at your option) any later version.
	15
	16	This program is distributed in the hope that it will be useful,
	17	but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	GNU General Public License for more details.
	20
	21	You should have received a copy of the GNU General Public License
	22	along with this program; if not, write to the Free Software
	23	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	24	*/
	25
	26	#ifndef V4L2_COMMON_H_
	27	#define V4L2_COMMON_H_
	28
401998fa MCC	29	#include <media/v4l2-dev.h>
401998fa MCC	30
76a59fe7	31	/* Common printk constructs for v4l-i2c drivers. These macros create a unique
7e8b09ea HV	32	prefix consisting of the driver name, the adapter number and the i2c
	33	address. */
	34	#define v4l_printk(level, name, adapter, addr, fmt, arg...) \
	35	printk(level "%s %d-%04x: " fmt, name, i2c_adapter_id(adapter), addr , ## arg)
	36
cab462f7	37	#define v4l_client_printk(level, client, fmt, arg...) \
f9d32f25	38	v4l_printk(level, (client)->dev.driver->name, (client)->adapter, \
7e8b09ea HV	39	(client)->addr, fmt , ## arg)
	40
	41	#define v4l_err(client, fmt, arg...) \
	42	v4l_client_printk(KERN_ERR, client, fmt , ## arg)
	43
	44	#define v4l_warn(client, fmt, arg...) \
	45	v4l_client_printk(KERN_WARNING, client, fmt , ## arg)
	46
	47	#define v4l_info(client, fmt, arg...) \
	48	v4l_client_printk(KERN_INFO, client, fmt , ## arg)
	49
	50	/* These three macros assume that the debug level is set with a module
	51	parameter called 'debug'. */
f167cb4e	52	#define v4l_dbg(level, debug, client, fmt, arg...) \
6e6a8b5a	53	do { \
7e8b09ea HV	54	if (debug >= (level)) \
	55	v4l_client_printk(KERN_DEBUG, client, fmt , ## arg); \
	56	} while (0)
	57
a41231d5 MCC	58	/* Add a version of v4l_dbg to be used on drivers using dev_foo() macros */
	59	#define dev_dbg_lvl(__dev, __level, __debug, __fmt, __arg...) \
	60	do { \
	61	if (__debug >= (__level)) \
	62	dev_printk(KERN_DEBUG, __dev, __fmt, ##__arg); \
	63	} while (0)
	64
7e8b09ea HV	65	/* ------------------------------------------------------------------------- */
7e8b09ea HV	66
dd99120c HV	67	/* These printk constructs can be used with v4l2_device and v4l2_subdev */
	68	#define v4l2_printk(level, dev, fmt, arg...) \
	69	printk(level "%s: " fmt, (dev)->name , ## arg)
	70
	71	#define v4l2_err(dev, fmt, arg...) \
	72	v4l2_printk(KERN_ERR, dev, fmt , ## arg)
	73
	74	#define v4l2_warn(dev, fmt, arg...) \
	75	v4l2_printk(KERN_WARNING, dev, fmt , ## arg)
	76
	77	#define v4l2_info(dev, fmt, arg...) \
	78	v4l2_printk(KERN_INFO, dev, fmt , ## arg)
	79
	80	/* These three macros assume that the debug level is set with a module
	81	parameter called 'debug'. */
	82	#define v4l2_dbg(level, debug, dev, fmt, arg...) \
6e6a8b5a	83	do { \
dd99120c	84	if (debug >= (level)) \
6e6a8b5a	85	v4l2_printk(KERN_DEBUG, dev, fmt , ## arg); \
dd99120c HV	86	} while (0)
dd99120c HV	87
b8719158 MCC	88	/**
	89	* v4l2_ctrl_query_fill- Fill in a struct v4l2_queryctrl
	90	*
	91	* @qctrl: pointer to the &struct v4l2_queryctrl to be filled
	92	* @min: minimum value for the control
	93	* @max: maximum value for the control
	94	* @step: control step
	95	* @def: default value for the control
	96	*
	97	* Fills the &struct v4l2_queryctrl fields for the query control.
	98	*
	99	* .. note::
	100	*
	101	* This function assumes that the @qctrl->id field is filled.
	102	*
	103	* Returns -EINVAL if the control is not known by the V4L2 core, 0 on success.
	104	*/
dd99120c	105
b8719158 MCC	106	int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl,
b8719158 MCC	107	s32 min, s32 max, s32 step, s32 def);
9cb2318b HV	108
	109	/* ------------------------------------------------------------------------- */
	110
78a3b4db	111	/* I2C Helper functions */
8ffbc655 HV	112
	113	struct i2c_driver;
	114	struct i2c_adapter;
	115	struct i2c_client;
d2653e92	116	struct i2c_device_id;
dd99120c HV	117	struct v4l2_device;
	118	struct v4l2_subdev;
	119	struct v4l2_subdev_ops;
8ffbc655	120
a39c57f8 MCC	121	/**
	122	* v4l2_i2c_new_subdev - Load an i2c module and return an initialized
	123	* &struct v4l2_subdev.
	124	*
	125	* @v4l2_dev: pointer to &struct v4l2_device
	126	* @adapter: pointer to struct i2c_adapter
	127	* @client_type: name of the chip that's on the adapter.
	128	* @addr: I2C address. If zero, it will use @probe_addrs
	129	* @probe_addrs: array with a list of address. The last entry at such
4a3fad70	130	* array should be %I2C_CLIENT_END.
a39c57f8 MCC	131	*
	132	* returns a &struct v4l2_subdev pointer.
	133	*/
3c7c9370	134	struct v4l2_subdev v4l2_i2c_new_subdev(struct v4l2_device v4l2_dev,
9a1f8b34	135	struct i2c_adapter adapter, const char client_type,
53dacb15	136	u8 addr, const unsigned short *probe_addrs);
f0222c7d	137
f0222c7d HV	138	struct i2c_board_info;
f0222c7d HV	139
a39c57f8 MCC	140	/**
	141	* v4l2_i2c_new_subdev_board - Load an i2c module and return an initialized
	142	* &struct v4l2_subdev.
	143	*
	144	* @v4l2_dev: pointer to &struct v4l2_device
	145	* @adapter: pointer to struct i2c_adapter
	146	* @info: pointer to struct i2c_board_info used to replace the irq,
	147	* platform_data and addr arguments.
	148	* @probe_addrs: array with a list of address. The last entry at such
4a3fad70	149	* array should be %I2C_CLIENT_END.
a39c57f8 MCC	150	*
	151	* returns a &struct v4l2_subdev pointer.
	152	*/
f0222c7d	153	struct v4l2_subdev v4l2_i2c_new_subdev_board(struct v4l2_device v4l2_dev,
9a1f8b34 LP	154	struct i2c_adapter adapter, struct i2c_board_info info,
9a1f8b34 LP	155	const unsigned short *probe_addrs);
f0222c7d	156
06582930 SA	157	/**
	158	* v4l2_i2c_subdev_set_name - Set name for an I²C sub-device
	159	*
	160	* @sd: pointer to &struct v4l2_subdev
	161	* @client: pointer to struct i2c_client
	162	* @devname: the name of the device; if NULL, the I²C device's name will be used
	163	* @postfix: sub-device specific string to put right after the I²C device name;
	164	* may be NULL
	165	*/
	166	void v4l2_i2c_subdev_set_name(struct v4l2_subdev sd, struct i2c_client client,
	167	const char devname, const char postfix);
	168
a39c57f8 MCC	169	/**
	170	* v4l2_i2c_subdev_init - Initializes a &struct v4l2_subdev with data from
	171	* an i2c_client struct.
	172	*
	173	* @sd: pointer to &struct v4l2_subdev
	174	* @client: pointer to struct i2c_client
	175	* @ops: pointer to &struct v4l2_subdev_ops
	176	*/
dd99120c HV	177	void v4l2_i2c_subdev_init(struct v4l2_subdev sd, struct i2c_client client,
dd99120c HV	178	const struct v4l2_subdev_ops *ops);
a39c57f8 MCC	179
	180	/**
	181	* v4l2_i2c_subdev_addr - returns i2c client address of &struct v4l2_subdev.
	182	*
	183	* @sd: pointer to &struct v4l2_subdev
	184	*
	185	* Returns the address of an I2C sub-device
	186	*/
ab373190	187	unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd);
dd99120c	188
76a59fe7 MCC	189	/**
	190	* enum v4l2_i2c_tuner_type - specifies the range of tuner address that
	191	* should be used when seeking for I2C devices.
	192	*
	193	* @ADDRS_RADIO: Radio tuner addresses.
	194	* Represent the following I2C addresses:
	195	* 0x10 (if compiled with tea5761 support)
	196	* and 0x60.
	197	* @ADDRS_DEMOD: Demod tuner addresses.
	198	* Represent the following I2C addresses:
	199	* 0x42, 0x43, 0x4a and 0x4b.
	200	* @ADDRS_TV: TV tuner addresses.
	201	* Represent the following I2C addresses:
	202	* 0x42, 0x43, 0x4a, 0x4b, 0x60, 0x61, 0x62,
	203	* 0x63 and 0x64.
	204	* @ADDRS_TV_WITH_DEMOD: TV tuner addresses if demod is present, this
	205	* excludes addresses used by the demodulator
	206	* from the list of candidates.
	207	* Represent the following I2C addresses:
	208	* 0x60, 0x61, 0x62, 0x63 and 0x64.
	209	*
	210	* NOTE: All I2C addresses above use the 7-bit notation.
	211	*/
c7d29e2f	212	enum v4l2_i2c_tuner_type {
76a59fe7 MCC	213	ADDRS_RADIO,
	214	ADDRS_DEMOD,
	215	ADDRS_TV,
c7d29e2f HV	216	ADDRS_TV_WITH_DEMOD,
c7d29e2f HV	217	};
76a59fe7 MCC	218	/**
	219	* v4l2_i2c_tuner_addrs - Return a list of I2C tuner addresses to probe.
	220	*
	221	* @type: type of the tuner to seek, as defined by
	222	* &enum v4l2_i2c_tuner_type.
	223	*
	224	* NOTE: Use only if the tuner addresses are unknown.
	225	*/
c7d29e2f HV	226	const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type);
c7d29e2f HV	227
8ffbc655	228	/* ------------------------------------------------------------------------- */
85e09219 DB	229
	230	/* SPI Helper functions */
	231	#if defined(CONFIG_SPI)
	232
	233	#include <linux/spi/spi.h>
	234
	235	struct spi_device;
	236
b8719158 MCC	237	/**
	238	* v4l2_spi_new_subdev - Load an spi module and return an initialized
	239	* &struct v4l2_subdev.
	240	*
	241	*
	242	* @v4l2_dev: pointer to &struct v4l2_device.
	243	* @master: pointer to struct spi_master.
	244	* @info: pointer to struct spi_board_info.
	245	*
	246	* returns a &struct v4l2_subdev pointer.
	247	*/
85e09219 DB	248	struct v4l2_subdev v4l2_spi_new_subdev(struct v4l2_device v4l2_dev,
	249	struct spi_master master, struct spi_board_info info);
	250
b8719158 MCC	251	/**
	252	* v4l2_spi_subdev_init - Initialize a v4l2_subdev with data from an
	253	* spi_device struct.
	254	*
	255	* @sd: pointer to &struct v4l2_subdev
	256	* @spi: pointer to struct spi_device.
	257	* @ops: pointer to &struct v4l2_subdev_ops
	258	*/
85e09219 DB	259	void v4l2_spi_subdev_init(struct v4l2_subdev sd, struct spi_device spi,
	260	const struct v4l2_subdev_ops *ops);
	261	#endif
	262
	263	/* ------------------------------------------------------------------------- */
8ffbc655	264
01154ef5 MCC	265	/*
	266	* FIXME: these remaining ioctls/structs should be removed as well, but they
	267	* are still used in tuner-simple.c (TUNER_SET_CONFIG) and cx18/ivtv (RESET).
	268	* To remove these ioctls some more cleanup is needed in those modules.
76a59fe7 MCC	269	*
	270	* It doesn't make much sense on documenting them, as what we really want is
	271	* to get rid of them.
01154ef5	272	*/
b2f0648f	273
78a3b4db	274	/* s_config */
7f171123 MCC	275	struct v4l2_priv_tun_config {
	276	int tuner;
	277	void *priv;
	278	};
7f171123	279	#define TUNER_SET_CONFIG _IOW('d', 92, struct v4l2_priv_tun_config)
757d2505	280
6e6a8b5a	281	#define VIDIOC_INT_RESET _IOW ('d', 102, u32)
6c31e598	282
b0d3159b TP	283	/* ------------------------------------------------------------------------- */
	284
	285	/* Miscellaneous helper functions */
	286
76a59fe7 MCC	287	/**
	288	* v4l_bound_align_image - adjust video dimensions according to
	289	* a given constraints.
	290	*
	291	* @width: pointer to width that will be adjusted if needed.
	292	* @wmin: minimum width.
	293	* @wmax: maximum width.
	294	* @walign: least significant bit on width.
	295	* @height: pointer to height that will be adjusted if needed.
	296	* @hmin: minimum height.
	297	* @hmax: maximum height.
ae5a8ca8	298	* @halign: least significant bit on height.
76a59fe7 MCC	299	* @salign: least significant bit for the image size (e. g.
	300	* :math:`width * height`).
	301	*
	302	* Clip an image to have @width between @wmin and @wmax, and @height between
	303	* @hmin and @hmax, inclusive.
	304	*
	305	* Additionally, the @width will be a multiple of :math:`2^{walign}`,
	306	* the @height will be a multiple of :math:`2^{halign}`, and the overall
	307	* size :math:`width * height` will be a multiple of :math:`2^{salign}`.
	308	*
	309	* .. note::
	310	*
	311	* #. The clipping rectangle may be shrunk or enlarged to fit the alignment
	312	* constraints.
	313	* #. @wmax must not be smaller than @wmin.
	314	* #. @hmax must not be smaller than @hmin.
	315	* #. The alignments must not be so high there are no possible image
	316	* sizes within the allowed bounds.
	317	* #. @wmin and @hmin must be at least 1 (don't use 0).
	318	* #. For @walign, @halign and @salign, if you don't care about a certain
	319	* alignment, specify ``0``, as :math:`2^0 = 1` and one byte alignment
	320	* is equivalent to no alignment.
	321	* #. If you only want to adjust downward, specify a maximum that's the
	322	* same as the initial value.
	323	*/
	324	void v4l_bound_align_image(unsigned int *width, unsigned int wmin,
b0d3159b	325	unsigned int wmax, unsigned int walign,
76a59fe7	326	unsigned int *height, unsigned int hmin,
b0d3159b TP	327	unsigned int hmax, unsigned int halign,
b0d3159b TP	328	unsigned int salign);
3fd8e647	329
95ce9c28 SA	330	/**
	331	* v4l2_find_nearest_size - Find the nearest size among a discrete
	332	* set of resolutions contained in an array of a driver specific struct.
	333	*
	334	* @array: a driver specific array of image sizes
d2dc57b1	335	* @array_size: the length of the driver specific array of image sizes
95ce9c28 SA	336	* @width_field: the name of the width field in the driver specific struct
	337	* @height_field: the name of the height field in the driver specific struct
	338	* @width: desired width.
	339	* @height: desired height.
	340	*
	341	* Finds the closest resolution to minimize the width and height differences
	342	* between what requested and the supported resolutions. The size of the width
	343	* and height fields in the driver specific must equal to that of u32, i.e. four
	344	* bytes.
	345	*
	346	* Returns the best match or NULL if the length of the array is zero.
	347	*/
d2dc57b1	348	#define v4l2_find_nearest_size(array, array_size, width_field, height_field, \
95ce9c28 SA	349	width, height) \
	350	({ \
	351	BUILD_BUG_ON(sizeof((array)->width_field) != sizeof(u32) \|\| \
	352	sizeof((array)->height_field) != sizeof(u32)); \
2bbc46e8	353	(typeof(&(array)[0]))__v4l2_find_nearest_size( \
d2dc57b1	354	(array), array_size, sizeof(*(array)), \
95ce9c28 SA	355	offsetof(typeof(*(array)), width_field), \
	356	offsetof(typeof(*(array)), height_field), \
	357	width, height); \
	358	})
	359	const void *
	360	__v4l2_find_nearest_size(const void *array, size_t array_size,
	361	size_t entry_size, size_t width_offset,
	362	size_t height_offset, s32 width, s32 height);
	363
672de9a7 HV	364	/**
	365	* v4l2_g_parm_cap - helper routine for vidioc_g_parm to fill this in by
	366	* calling the g_frame_interval op of the given subdev. It only works
	367	* for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the
	368	* function name.
	369	*
	370	* @vdev: the struct video_device pointer. Used to determine the device caps.
	371	* @sd: the sub-device pointer.
	372	* @a: the VIDIOC_G_PARM argument.
	373	*/
	374	int v4l2_g_parm_cap(struct video_device *vdev,
	375	struct v4l2_subdev sd, struct v4l2_streamparm a);
	376
	377	/**
	378	* v4l2_s_parm_cap - helper routine for vidioc_s_parm to fill this in by
	379	* calling the s_frame_interval op of the given subdev. It only works
	380	* for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the
	381	* function name.
	382	*
	383	* @vdev: the struct video_device pointer. Used to determine the device caps.
	384	* @sd: the sub-device pointer.
	385	* @a: the VIDIOC_S_PARM argument.
	386	*/
	387	int v4l2_s_parm_cap(struct video_device *vdev,
	388	struct v4l2_subdev sd, struct v4l2_streamparm a);
	389
85de5e06 AM	390	/* Compare two v4l2_fract structs */
	391	#define V4L2_FRACT_COMPARE(a, OP, b) \
	392	((u64)(a).numerator * (b).denominator OP \
	393	(u64)(b).numerator * (a).denominator)
	394
f44b969a EG	395	/* ------------------------------------------------------------------------- */
	396
	397	/* Pixel format and FourCC helpers */
	398
	399	/**
	400	* struct v4l2_format_info - information about a V4L2 format
	401	* @format: 4CC format identifier (V4L2_PIX_FMT_*)
	402	* @mem_planes: Number of memory planes, which includes the alpha plane (1 to 4).
	403	* @comp_planes: Number of component planes, which includes the alpha plane (1 to 4).
	404	* @bpp: Array of per-plane bytes per pixel
	405	* @hdiv: Horizontal chroma subsampling factor
	406	* @vdiv: Vertical chroma subsampling factor
	407	* @block_w: Per-plane macroblock pixel width (optional)
	408	* @block_h: Per-plane macroblock pixel height (optional)
	409	*/
	410	struct v4l2_format_info {
	411	u32 format;
	412	u8 mem_planes;
	413	u8 comp_planes;
	414	u8 bpp[4];
	415	u8 hdiv;
	416	u8 vdiv;
	417	u8 block_w[4];
	418	u8 block_h[4];
	419	};
	420
	421	const struct v4l2_format_info *v4l2_format_info(u32 format);
	422
	423	int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, int pixelformat,
	424	int width, int height);
	425	int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, int pixelformat,
	426	int width, int height);
	427
b2f0648f	428	#endif /* V4L2_COMMON_H_ */