diff options
author | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-10-05 09:50:36 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-10-05 09:50:36 -0300 |
commit | 07c68a7423c4e44cc4f85caa83bb7fae36367250 (patch) | |
tree | 3dee15876f40f5830e2234d2035162d045f53784 /include/media | |
parent | efe98010b80ec4516b2779e1b4e4a8ce16bf89fe (diff) |
[media] DocBook: Document include/media/tuner.h
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>
Diffstat (limited to 'include/media')
-rw-r--r-- | include/media/tuner.h | 70 |
1 files changed, 52 insertions, 18 deletions
diff --git a/include/media/tuner.h b/include/media/tuner.h index b46ebb48fe74..4445dcbfdb80 100644 --- a/include/media/tuner.h +++ b/include/media/tuner.h @@ -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); }; |