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[media] DocBook: Document include/media/tuner.h

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This is part of the V4L2 core, so its kABI should be
documented at device-drivers DocBook.

Add the meta-tags for that.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2015-10-05 09:50:36 -03:00
parent efe98010b8
commit 07c68a7423
2 changed files with 53 additions and 18 deletions
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1
Documentation/DocBook/device-drivers.tmpl
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@ -221,6 +221,7 @@ X!Isound/sound_firmware.c
<title>Media Devices</title>
<sect1><title>Video2Linux devices</title>
!Iinclude/media/tuner.h
!Iinclude/media/v4l2-async.h
!Iinclude/media/v4l2-ctrls.h
!Iinclude/media/v4l2-dv-timings.h

70
include/media/tuner.h
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@ -166,33 +166,67 @@
#define TDA9887_GAIN_NORMAL (1<<20)
#define TDA9887_RIF_41_3 (1<<21) /* radio IF1 41.3 vs 33.3 */
/**
* enum tuner_mode - Mode of the tuner
*
* @T_RADIO: Tuner core will work in radio mode
* @T_ANALOG_TV: Tuner core will work in analog TV mode
*
* Older boards only had a single tuner device, but some devices have a
* separate tuner for radio. In any case, the tuner-core needs to know if
* the tuner chip(s) will be used in radio mode or analog TV mode, as, on
* radio mode, frequencies are specified on a different range than on TV
* mode. This enum is used by the tuner core in order to work with the
* proper tuner range and eventually use a different tuner chip while in
* radio mode.
*/
enum tuner_mode {
T_RADIO = 1 << V4L2_TUNER_RADIO,
T_ANALOG_TV = 1 << V4L2_TUNER_ANALOG_TV,
/* Don't need to map V4L2_TUNER_DIGITAL_TV, as tuner-core won't use it */
};
/* Older boards only had a single tuner device. Nowadays multiple tuner
devices may be present on a single board. Using TUNER_SET_TYPE_ADDR
to pass the tuner_setup structure it is possible to setup each tuner
device in turn.
Since multiple devices may be present it is no longer sufficient to
send a command to a single i2c device. Instead you should broadcast
the command to all i2c devices.
By setting the mode_mask correctly you can select which commands are
accepted by a specific tuner device. For example, set mode_mask to
T_RADIO if the device is a radio-only tuner. That specific tuner will
only accept commands when the tuner is in radio mode and ignore them
when the tuner is set to TV mode.
/**
* struct tuner_setup - setup the tuner chipsets
*
* @addr: I2C address used to control the tuner device/chipset
* @type: Type of the tuner, as defined at the TUNER_* macros.
* Each different tuner model should have an unique
* identifier.
* @mode_mask: Mask with the allowed tuner modes: V4L2_TUNER_RADIO,
* V4L2_TUNER_ANALOG_TV and/or V4L2_TUNER_DIGITAL_TV,
* describing if the tuner should be used to support
* Radio, analog TV and/or digital TV.
* @config: Used to send tuner-specific configuration for complex
* tuners that require extra parameters to be set.
* Only a very few tuners require it and its usage on
* newer tuners should be avoided.
* @tuner_callback: Some tuners require to call back the bridge driver,
* in order to do some tasks like rising a GPIO at the
* bridge chipset, in order to do things like resetting
* the device.
*
* Older boards only had a single tuner device. Nowadays multiple tuner
* devices may be present on a single board. Using TUNER_SET_TYPE_ADDR
* to pass the tuner_setup structure it is possible to setup each tuner
* device in turn.
*
* Since multiple devices may be present it is no longer sufficient to
* send a command to a single i2c device. Instead you should broadcast
* the command to all i2c devices.
*
* By setting the mode_mask correctly you can select which commands are
* accepted by a specific tuner device. For example, set mode_mask to
* T_RADIO if the device is a radio-only tuner. That specific tuner will
* only accept commands when the tuner is in radio mode and ignore them
* when the tuner is set to TV mode.
*/
struct tuner_setup {
unsigned short addr; /* I2C address */
unsigned int type; /* Tuner type */
unsigned int mode_mask; /* Allowed tuner modes */
void *config; /* configuraion for more complex tuners */
unsigned short addr;
unsigned int type;
unsigned int mode_mask;
void *config;
int (*tuner_callback) (void *dev, int component, int cmd, int arg);
};