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[media] dvb-frontend: enable tuner link when the FE thread starts 

If the dvb frontend thread starts, the tuner should be switched
to the frontend. Add a code that ensures that this will happen,
using the media controller.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2015-01-06 13:57:55 -03:00
parent 6bb0b1829b
commit 9239effd53
1 changed files with 94 additions and 0 deletions
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94
drivers/media/dvb-core/dvb_frontend.c
View File

@ -590,12 +590,99 @@ 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.
*/
static int dvb_enable_media_tuner(struct dvb_frontend *fe)
{
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
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 i, ret, n_links = 0, active_links = 0;
if (!mdev)
return 0;
entity = fepriv->dvbdev->entity;
for (i = 0; i < entity->num_links; i++) {
link = &entity->links[i];
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;
for (i = 0; i < source->num_links; i++) {
struct media_entity *sink;
int flags = 0;
link = &source->links[i];
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");
}
#endif
return 0;
}
static int dvb_frontend_thread(void *data)
{
struct dvb_frontend *fe = data;
struct dvb_frontend_private *fepriv = fe->frontend_priv;
fe_status_t s;
enum dvbfe_algo algo;
int ret;
bool re_tune = false;
bool semheld = false;
@ -609,6 +696,13 @@ static int dvb_frontend_thread(void *data)
fepriv->wakeup = 0;
fepriv->reinitialise = 0;
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");
}
dvb_frontend_init(fe);
set_freezable();