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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
Copyright (C) 2005 Hans Verkuil <>
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
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>
/* v4l debugging and diagnostics */
/* Debug bitmask flags to be used on V4L2 */
#define V4L2_DEBUG_IOCTL 0x01
#define V4L2_DEBUG_IOCTL_ARG 0x02
/* Common printk constucts 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)->driver->, (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)
/* Prints the ioctl in a human-readable format */
extern void v4l_printk_ioctl(unsigned int cmd);
/* Use this macro for non-I2C drivers. Pass the driver name as the first arg. */
#define v4l_print_ioctl(name, cmd) \
do { \
printk(KERN_DEBUG "%s: ", name); \
v4l_printk_ioctl(cmd); \
} while (0)
/* Use this macro in I2C drivers where 'client' is the struct i2c_client
pointer */
#define v4l_i2c_print_ioctl(client, cmd) \
do { \
v4l_client_printk(KERN_DEBUG, client, ""); \
v4l_printk_ioctl(cmd); \
} while (0)
/* ------------------------------------------------------------------------- */
/* Control helper functions */
int v4l2_ctrl_check(struct v4l2_ext_control *ctrl, struct v4l2_queryctrl *qctrl,
const char **menu_items);
const char **v4l2_ctrl_get_menu(u32 id);
int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, s32 min, s32 max, s32 step, s32 def);
int v4l2_ctrl_query_fill_std(struct v4l2_queryctrl *qctrl);
int v4l2_ctrl_query_menu(struct v4l2_querymenu *qmenu,
struct v4l2_queryctrl *qctrl, const char **menu_items);
u32 v4l2_ctrl_next(const u32 * const *ctrl_classes, u32 id);
/* ------------------------------------------------------------------------- */
/* Register/chip ident helper function */
struct i2c_client; /* forward reference */
int v4l2_chip_match_i2c_client(struct i2c_client *c, u32 id_type, u32 chip_id);
int v4l2_chip_ident_i2c_client(struct i2c_client *c, struct v4l2_chip_ident *chip,
u32 ident, u32 revision);
int v4l2_chip_match_host(u32 id_type, u32 chip_id);
/* ------------------------------------------------------------------------- */
/* Internal ioctls */
struct v4l2_decode_vbi_line {
u32 is_second_field; /* Set to 0 for the first (odd) field,
set to 1 for the second (even) field. */
u8 *p; /* Pointer to the sliced VBI data from the decoder.
On exit points to the start of the payload. */
u32 line; /* Line number of the sliced VBI data (1-23) */
u32 type; /* VBI service type (V4L2_SLICED_*). 0 if no service found */
/* audio ioctls */
/* v4l device was opened in Radio mode, to be replaced by VIDIOC_INT_S_TUNER_MODE */
#define AUDC_SET_RADIO _IO('d',88)
/* tuner ioctls */
/* Sets tuner type and its I2C addr */
#define TUNER_SET_TYPE_ADDR _IOW('d', 90, int)
/* Puts tuner on powersaving state, disabling it, except for i2c. To be replaced
#define TUNER_SET_STANDBY _IOW('d', 91, int)
/* Sets tda9887 specific stuff, like port1, port2 and qss */
#define TDA9887_SET_CONFIG _IOW('d', 92, int)
/* Switch the tuner to a specific tuner mode. Replacement of AUDC_SET_RADIO */
#define VIDIOC_INT_S_TUNER_MODE _IOW('d', 93, enum v4l2_tuner_type)
/* Generic standby command. Passing -1 (all bits set to 1) will put the whole
chip into standby mode, value 0 will make the chip fully active. Specific
bits can be used by certain chips to enable/disable specific subsystems.
Replacement of TUNER_SET_STANDBY. */
#define VIDIOC_INT_S_STANDBY _IOW('d', 94, u32)
/* 100, 101 used by VIDIOC_DBG_[SG]_REGISTER */
/* Generic reset command. The argument selects which subsystems to reset.
Passing 0 will always reset the whole chip. */
#define VIDIOC_INT_RESET _IOW ('d', 102, u32)
/* Set the frequency (in Hz) of the audio clock output.
Used to slave an audio processor to the video decoder, ensuring that audio
and video remain synchronized.
Usual values for the frequency are 48000, 44100 or 32000 Hz.
If the frequency is not supported, then -EINVAL is returned. */
#define VIDIOC_INT_AUDIO_CLOCK_FREQ _IOW ('d', 103, u32)
/* Video decoders that support sliced VBI need to implement this ioctl.
Field p of the v4l2_sliced_vbi_line struct is set to the start of the VBI
data that was generated by the decoder. The driver then parses the sliced
VBI data and sets the other fields in the struct accordingly. The pointer p
is updated to point to the start of the payload which can be copied
verbatim into the data field of the v4l2_sliced_vbi_data struct. If no
valid VBI data was found, then the type field is set to 0 on return. */
#define VIDIOC_INT_DECODE_VBI_LINE _IOWR('d', 104, struct v4l2_decode_vbi_line)
/* Used to generate VBI signals on a video signal. v4l2_sliced_vbi_data is
filled with the data packets that should be output. Note that if you set
the line field to 0, then that VBI signal is disabled. If no
valid VBI data was found, then the type field is set to 0 on return. */
#define VIDIOC_INT_S_VBI_DATA _IOW ('d', 105, struct v4l2_sliced_vbi_data)
/* Used to obtain the sliced VBI packet from a readback register. Not all
video decoders support this. If no data is available because the readback
register contains invalid or erroneous data -EIO is returned. Note that
you must fill in the 'id' member and the 'field' member (to determine
whether CC data from the first or second field should be obtained). */
#define VIDIOC_INT_G_VBI_DATA _IOWR('d', 106, struct v4l2_sliced_vbi_data)
/* Sets I2S speed in bps. This is used to provide a standard way to select I2S
clock used by driving digital audio streams at some board designs.
Usual values for the frequency are 1024000 and 2048000.
If the frequency is not supported, then -EINVAL is returned. */
#define VIDIOC_INT_I2S_CLOCK_FREQ _IOW ('d', 108, u32)
/* Routing definition, device dependent. It specifies which inputs (if any)
should be routed to which outputs (if any). */
struct v4l2_routing {
u32 input;
u32 output;
/* These internal commands should be used to define the inputs and outputs
of an audio/video chip. They will replace the v4l2 API commands
that are meant to be used by the user.
The internal commands should be used to switch inputs/outputs
because only the driver knows how to map a 'Television' input to the precise
input/output routing of an A/D converter, or a DSP, or a video digitizer.
These four commands should only be sent directly to an i2c device, they
should not be broadcast as the routing is very device specific. */
#define VIDIOC_INT_S_AUDIO_ROUTING _IOW ('d', 109, struct v4l2_routing)
#define VIDIOC_INT_G_AUDIO_ROUTING _IOR ('d', 110, struct v4l2_routing)
#define VIDIOC_INT_S_VIDEO_ROUTING _IOW ('d', 111, struct v4l2_routing)
#define VIDIOC_INT_G_VIDEO_ROUTING _IOR ('d', 112, struct v4l2_routing)
struct v4l2_crystal_freq {
u32 freq; /* frequency in Hz of the crystal */
u32 flags; /* device specific flags */
/* Sets the frequency of the crystal used to generate the clocks.
An extra flags field allows device specific configuration regarding
clock frequency dividers, etc. If not used, then set flags to 0.
If the frequency is not supported, then -EINVAL is returned. */
#define VIDIOC_INT_S_CRYSTAL_FREQ _IOW ('d', 113, struct v4l2_crystal_freq)
/* Initialize the sensor registors to some sort of reasonable
default values. */
#define VIDIOC_INT_INIT _IOW ('d', 114, u32)
/* Set v4l2_std_id for video OUTPUT devices. This is ignored by
video input devices. */
#define VIDIOC_INT_S_STD_OUTPUT _IOW ('d', 115, v4l2_std_id)
/* Get v4l2_std_id for video OUTPUT devices. This is ignored by
video input devices. */
#define VIDIOC_INT_G_STD_OUTPUT _IOW ('d', 116, v4l2_std_id)
#endif /* V4L2_COMMON_H_ */