/*
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_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 width.
* @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_format - find the nearest format size among a discrete
* set of resolutions.
*
* @sizes: array of &struct v4l2_frmsize_discrete image sizes.
* @num_sizes: length of @sizes array.
* @width: desired width.
* @height: desired height.
*
* Finds the closest resolution to minimize the width and height differences
* between what requested and the supported resolutions.
*/
const struct v4l2_frmsize_discrete *
v4l2_find_nearest_format(const struct v4l2_frmsize_discrete *sizes,
const size_t num_sizes,
s32 width, s32 height);
/**
* v4l2_get_timestamp - helper routine to get a timestamp to be used when
* filling streaming metadata. Internally, it uses ktime_get_ts(),
* which is the recommended way to get it.
*
* @tv: pointer to &struct timeval to be filled.
*/
void v4l2_get_timestamp(struct timeval *tv);
#endif /* V4L2_COMMON_H_ */
