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[media] dvb_frontend: document the most used functions

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Documents the most used functions at the Digital TV
kABI: dvb_frontend_register(), dvb_frontend_unregister()
and dvb_frontend_detach().

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2015-11-10 10:46:25 -02:00
parent 75f400b0e3
commit 66f4b3cb5c
1 changed files with 40 additions and 3 deletions
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43
drivers/media/dvb-core/dvb_frontend.h
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@ -687,12 +687,49 @@ struct dvb_frontend {
unsigned int exit;
};
extern int dvb_register_frontend(struct dvb_adapter *dvb,
/**
* dvb_register_frontend() - Registers a DVB frontend at the adapter
*
* @dvb: pointer to the dvb adapter
* @fe: pointer to the frontend struct
*
* Allocate and initialize the private data needed by the frontend core to
* manage the frontend and calls dvb_register_device() to register a new
* frontend. It also cleans the property cache that stores the frontend
* parameters and selects the first available delivery system.
*/
int dvb_register_frontend(struct dvb_adapter *dvb,
struct dvb_frontend *fe);
extern int dvb_unregister_frontend(struct dvb_frontend *fe);
/**
* dvb_unregister_frontend() - Unregisters a DVB frontend
*
* @fe: pointer to the frontend struct
*
* Stops the frontend kthread, calls dvb_unregister_device() and frees the
* private frontend data allocated by dvb_register_frontend().
*
* NOTE: This function doesn't frees the memory allocated by the demod,
* by the SEC driver and by the tuner. In order to free it, an explicit call to
* dvb_frontend_detach() is needed, after calling this function.
*/
int dvb_unregister_frontend(struct dvb_frontend *fe);
extern void dvb_frontend_detach(struct dvb_frontend *fe);
/**
* dvb_frontend_detach() - Detaches and frees frontend specific data
*
* @fe: pointer to the frontend struct
*
* This function should be called after dvb_unregister_frontend(). It
* calls the SEC, tuner and demod release functions:
* &dvb_frontend_ops.release_sec, &dvb_frontend_ops.tuner_ops.release,
* &dvb_frontend_ops.analog_ops.release and &dvb_frontend_ops.release.
*
* If the driver is compiled with CONFIG_MEDIA_ATTACH, it also decreases
* the module reference count, needed to allow userspace to remove the
* previously used DVB frontend modules.
*/
void dvb_frontend_detach(struct dvb_frontend *fe);
extern int dvb_frontend_suspend(struct dvb_frontend *fe);
extern int dvb_frontend_resume(struct dvb_frontend *fe);