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[media] media: dvb-frontend invoke enable/disable_source handlers

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Change dvb frontend to check if tuner is free when device opened in RW
mode.

Call to enable_source handler either returns with an active pipeline to
tuner or error if tuner is busy.

Tuner is released when frontend is released calling the disable_source
handler.

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Shuah Khan 2016-02-11 21:41:36 -02:00 committed by Mauro Carvalho Chehab
parent c94903f1f7
commit 68ff5767dd
1 changed files with 21 additions and 114 deletions
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135
drivers/media/dvb-core/dvb_frontend.c
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@ -134,7 +134,6 @@ struct dvb_frontend_private {
#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
struct media_pipeline pipe;
struct media_entity *pipe_start_entity;
#endif
};
@ -600,94 +599,6 @@ static void dvb_frontend_wakeup(struct dvb_frontend *fe)
wake_up_interruptible(&fepriv->wait_queue);
}
/**
* dvb_enable_media_tuner() - tries to enable the DVB tuner
*
* @fe: struct dvb_frontend pointer
*
* This function ensures that just one media tuner is enabled for a given
* frontend. It has two different behaviors:
* - For trivial devices with just one tuner:
* it just enables the existing tuner->fe link
* - For devices with more than one tuner:
* It is up to the driver to implement the logic that will enable one tuner
* and disable the other ones. However, if more than one tuner is enabled for
* the same frontend, it will print an error message and return -EINVAL.
*
* At return, it will return the error code returned by media_entity_setup_link,
* or 0 if everything is OK, if no tuner is linked to the frontend or if the
* mdev is NULL.
*/
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
static int dvb_enable_media_tuner(struct dvb_frontend *fe)
{
struct dvb_frontend_private *fepriv = fe->frontend_priv;
struct dvb_adapter *adapter = fe->dvb;
struct media_device *mdev = adapter->mdev;
struct media_entity *entity, *source;
struct media_link *link, *found_link = NULL;
int ret, n_links = 0, active_links = 0;
fepriv->pipe_start_entity = NULL;
if (!mdev)
return 0;
entity = fepriv->dvbdev->entity;
fepriv->pipe_start_entity = entity;
list_for_each_entry(link, &entity->links, list) {
if (link->sink->entity == entity) {
found_link = link;
n_links++;
if (link->flags & MEDIA_LNK_FL_ENABLED)
active_links++;
}
}
if (!n_links || active_links == 1 || !found_link)
return 0;
/*
* If a frontend has more than one tuner linked, it is up to the driver
* to select with one will be the active one, as the frontend core can't
* guess. If the driver doesn't do that, it is a bug.
*/
if (n_links > 1 && active_links != 1) {
dev_err(fe->dvb->device,
"WARNING: there are %d active links among %d tuners. This is a driver's bug!\n",
active_links, n_links);
return -EINVAL;
}
source = found_link->source->entity;
fepriv->pipe_start_entity = source;
list_for_each_entry(link, &source->links, list) {
struct media_entity *sink;
int flags = 0;
sink = link->sink->entity;
if (sink == entity)
flags = MEDIA_LNK_FL_ENABLED;
ret = media_entity_setup_link(link, flags);
if (ret) {
dev_err(fe->dvb->device,
"Couldn't change link %s->%s to %s. Error %d\n",
source->name, sink->name,
flags ? "enabled" : "disabled",
ret);
return ret;
} else
dev_dbg(fe->dvb->device,
"link %s->%s was %s\n",
source->name, sink->name,
flags ? "ENABLED" : "disabled");
}
return 0;
}
#endif
static int dvb_frontend_thread(void *data)
{
struct dvb_frontend *fe = data;
@ -695,10 +606,6 @@ static int dvb_frontend_thread(void *data)
struct dvb_frontend_private *fepriv = fe->frontend_priv;
enum fe_status s;
enum dvbfe_algo algo;
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
int ret;
#endif
bool re_tune = false;
bool semheld = false;
@ -711,20 +618,6 @@ static int dvb_frontend_thread(void *data)
fepriv->wakeup = 0;
fepriv->reinitialise = 0;
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
ret = dvb_enable_media_tuner(fe);
if (ret) {
/* FIXME: return an error if it fails */
dev_info(fe->dvb->device,
"proceeding with FE task\n");
} else if (fepriv->pipe_start_entity) {
ret = media_entity_pipeline_start(fepriv->pipe_start_entity,
&fepriv->pipe);
if (ret)
return ret;
}
#endif
dvb_frontend_init(fe);
set_freezable();
@ -834,12 +727,6 @@ restart:
}
}
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
if (fepriv->pipe_start_entity)
media_entity_pipeline_stop(fepriv->pipe_start_entity);
fepriv->pipe_start_entity = NULL;
#endif
if (dvb_powerdown_on_sleep) {
if (fe->ops.set_voltage)
fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
@ -2637,9 +2524,20 @@ static int dvb_frontend_open(struct inode *inode, struct file *file)
fepriv->tone = -1;
fepriv->voltage = -1;
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
if (fe->dvb->mdev && fe->dvb->mdev->enable_source) {
ret = fe->dvb->mdev->enable_source(dvbdev->entity,
&fepriv->pipe);
if (ret) {
dev_err(fe->dvb->device,
"Tuner is busy. Error %d\n", ret);
goto err2;
}
}
#endif
ret = dvb_frontend_start (fe);
if (ret)
goto err2;
goto err3;
/* empty event queue */
fepriv->events.eventr = fepriv->events.eventw = 0;
@ -2649,7 +2547,12 @@ static int dvb_frontend_open(struct inode *inode, struct file *file)
mutex_unlock (&adapter->mfe_lock);
return ret;
err3:
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
if (fe->dvb->mdev && fe->dvb->mdev->disable_source)
fe->dvb->mdev->disable_source(dvbdev->entity);
err2:
#endif
dvb_generic_release(inode, file);
err1:
if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
@ -2678,6 +2581,10 @@ static int dvb_frontend_release(struct inode *inode, struct file *file)
if (dvbdev->users == -1) {
wake_up(&fepriv->wait_queue);
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
if (fe->dvb->mdev && fe->dvb->mdev->disable_source)
fe->dvb->mdev->disable_source(dvbdev->entity);
#endif
if (fe->exit != DVB_FE_NO_EXIT)
wake_up(&dvbdev->wait_queue);
if (fe->ops.ts_bus_ctrl)