diff options
| author | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-11-10 11:54:15 -0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-11-17 06:40:54 -0200 |
| commit | 41c0b78e5eaf29f866ebffda4e0e86c9be589477 (patch) | |
| tree | 03a692b6d9639caa8575cd2433c4abd082eef2c2 /drivers/media | |
| parent | 3663b31b69222be90ce8bf346e0d5ba3b5ecbac0 (diff) | |
[media] dvb_frontend.h: Document suspend/resume functions
Those functions should be implemented on all drivers. So, document
them.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/dvb-core/dvb_frontend.h | 40 |
1 files changed, 38 insertions, 2 deletions
diff --git a/drivers/media/dvb-core/dvb_frontend.h b/drivers/media/dvb-core/dvb_frontend.h index 47e1ee44d638..bd79d55c4857 100644 --- a/drivers/media/dvb-core/dvb_frontend.h +++ b/drivers/media/dvb-core/dvb_frontend.h @@ -754,8 +754,44 @@ int dvb_unregister_frontend(struct dvb_frontend *fe); */ 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); +/** + * dvb_frontend_suspend() - Suspends a Digital TV frontend + * + * @fe: pointer to the frontend struct + * + * This function prepares a Digital TV frontend to suspend. + * + * In order to prepare the tuner to suspend, if + * &dvb_frontend_ops.tuner_ops.suspend() is available, it calls it. Otherwise, + * it will call &dvb_frontend_ops.tuner_ops.sleep(), if available. + * + * It will also call &dvb_frontend_ops.sleep() to put the demod to suspend. + * + * The drivers should also call dvb_frontend_suspend() as part of their + * handler for the &device_driver.suspend(). + */ +int dvb_frontend_suspend(struct dvb_frontend *fe); + +/** + * dvb_frontend_resume() - Resumes a Digital TV frontend + * + * @fe: pointer to the frontend struct + * + * This function resumes the usual operation of the tuner after resume. + * + * In order to resume the frontend, it calls the demod &dvb_frontend_ops.init(). + * + * If &dvb_frontend_ops.tuner_ops.resume() is available, It, it calls it. + * Otherwise,t will call &dvb_frontend_ops.tuner_ops.init(), if available. + * + * Once tuner and demods are resumed, it will enforce that the SEC voltage and + * tone are restored to their previous values and wake up the frontend's + * kthread in order to retune the frontend. + * + * The drivers should also call dvb_frontend_resume() as part of their + * handler for the &device_driver.resume(). + */ +int dvb_frontend_resume(struct dvb_frontend *fe); /** * dvb_frontend_reinitialise() - forces a reinitialisation at the frontend |