Add enable_source and disable_source handlers.
The enable source handler is called from
v4l2-core, dvb-core, and ALSA drivers to check
if the shared media source is free. The disable
source handler is called to release the shared
media source.
Signed-off-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
---
drivers/media/usb/au0828/au0828-core.c | 149 +++++++++++++++++++++++++++++++++
drivers/media/usb/au0828/au0828.h | 3 +
2 files changed, 152 insertions(+)
diff --git a/drivers/media/usb/au0828/au0828-core.c b/drivers/media/usb/au0828/au0828-core.c
index 4c90f28..fd2265c 100644
--- a/drivers/media/usb/au0828/au0828-core.c
+++ b/drivers/media/usb/au0828/au0828-core.c
@@ -282,6 +282,7 @@ static int au0828_create_media_graph(struct au0828_dev *dev)
return -EINVAL;
if (tuner) {
+ dev->tuner = tuner;
/* create tuner to decoder link in deactivated state */
ret = media_create_pad_link(tuner, TUNER_PAD_OUTPUT,
decoder, 0, 0);
@@ -373,6 +374,150 @@ void au0828_media_graph_notify(struct media_entity *new, void *notify_data)
#endif
}
+static int au0828_enable_source(struct media_entity *entity,
+ struct media_pipeline *pipe)
+{
+#ifdef CONFIG_MEDIA_CONTROLLER
+ struct media_entity *source;
+ struct media_entity *sink;
+ struct media_link *link, *found_link = NULL;
+ int ret = 0;
+ struct media_device *mdev = entity->graph_obj.mdev;
+ struct au0828_dev *dev;
+
+ if (!mdev)
+ return -ENODEV;
+
+ /* for Audio and Video entities, source is the decoder */
+ mutex_lock(&mdev->graph_mutex);
+
+ dev = mdev->source_priv;
+ if (!dev->tuner || !dev->decoder) {
+ ret = -ENODEV;
+ goto end;
+ }
+
+ /*
+ * For Audio and V4L2 entity, find the link to which decoder
+ * is the sink. Look for an active link between decoder and
+ * tuner, if one exists, nothing to do. If not, look for any
+ * active links between tuner and any other entity. If one
+ * exists, tuner is busy. If tuner is free, setup link and
+ * start pipeline from source (tuner).
+ * For DVB FE entity, the source for the link is the tuner.
+ * Check if tuner is available and setup link and start
+ * pipeline.
+ */
+ if (entity->function != MEDIA_ENT_F_DTV_DEMOD)
+ sink = dev->decoder;
+ else
+ sink = entity;
+
+ /* Is an active link between sink and tuner */
+ if (dev->active_link) {
+ if (dev->active_link->sink->entity == sink &&
+ dev->active_link->source->entity == dev->tuner) {
+ ret = 0;
+ goto end;
+ } else {
+ ret = -EBUSY;
+ goto end;
+ }
+ }
+
+ list_for_each_entry(link, &sink->links, list) {
+ /* Check sink, and source */
+ if (link->sink->entity == sink &&
+ link->source->entity == dev->tuner) {
+ found_link = link;
+ break;
+ }
+ }
+
+ if (!found_link) {
+ ret = -ENODEV;
+ goto end;
+ }
+
+ /* activate link between source and sink and start pipeline */
+ source = found_link->source->entity;
+ ret = __media_entity_setup_link(found_link, MEDIA_LNK_FL_ENABLED);
+ if (ret) {
+ pr_err(
+ "Activate tuner link %s->%s. Error %d\n",
+ source->name, sink->name, ret);
+ goto end;
+ }
+
+ ret = __media_entity_pipeline_start(entity, pipe);
+ if (ret) {
+ pr_err("Start Pipeline: %s->%s Error %d\n",
+ source->name, entity->name, ret);
+ ret = __media_entity_setup_link(found_link, 0);
+ pr_err("Deactive link Error %d\n", ret);
+ goto end;
+ }
+ /*
+ * save active link and active link owner to avoid audio
+ * deactivating video owned link from disable_source and
+ * vice versa
+ */
+ dev->active_link = found_link;
+ dev->active_link_owner = entity;
+end:
+ mutex_unlock(&mdev->graph_mutex);
+ pr_debug("au0828_enable_source() end %s %d %d\n",
+ entity->name, entity->function, ret);
+ return ret;
+#endif
+ return 0;
+}
+
+static void au0828_disable_source(struct media_entity *entity)
+{
+#ifdef CONFIG_MEDIA_CONTROLLER
+ struct media_entity *sink;
+ int ret = 0;
+ struct media_device *mdev = entity->graph_obj.mdev;
+ struct au0828_dev *dev;
+
+ if (!mdev)
+ return;
+
+ mutex_lock(&mdev->graph_mutex);
+ dev = mdev->source_priv;
+ if (!dev->tuner || !dev->decoder || !dev->active_link) {
+ ret = -ENODEV;
+ goto end;
+ }
+
+ if (entity->function != MEDIA_ENT_F_DTV_DEMOD)
+ sink = dev->decoder;
+ else
+ sink = entity;
+
+ /* link is active - stop pipeline from source (tuner) */
+ if (dev->active_link && dev->active_link->sink->entity == sink &&
+ dev->active_link->source->entity == dev->tuner) {
+ /*
+ * prevent video from deactivating link when audio
+ * has active pipeline
+ */
+ if (dev->active_link_owner != entity)
+ goto end;
+ __media_entity_pipeline_stop(entity);
+ ret = __media_entity_setup_link(dev->active_link, 0);
+ if (ret)
+ pr_err("Deactive link Error %d\n", ret);
+ dev->active_link = NULL;
+ dev->active_link_owner = NULL;
+ }
+
+end:
+ mutex_unlock(&mdev->graph_mutex);
+#endif
+}
+
static int au0828_media_device_register(struct au0828_dev *dev,
struct usb_device *udev)
{
@@ -403,6 +548,10 @@ static int au0828_media_device_register(struct au0828_dev *dev,
ret);
return ret;
}
+ /* set enable_source */
+ dev->media_dev->source_priv = (void *) dev;
+ dev->media_dev->enable_source = au0828_enable_source;
+ dev->media_dev->disable_source = au0828_disable_source;
#endif
return 0;
}
diff --git a/drivers/media/usb/au0828/au0828.h b/drivers/media/usb/au0828/au0828.h
index 54379ec..a7c88a1 100644
--- a/drivers/media/usb/au0828/au0828.h
+++ b/drivers/media/usb/au0828/au0828.h
@@ -284,6 +284,9 @@ struct au0828_dev {
struct media_entity input_ent[AU0828_MAX_INPUT];
struct media_pad input_pad[AU0828_MAX_INPUT];
struct media_entity_notify entity_notify;
+ struct media_entity *tuner;
+ struct media_link *active_link;
+ struct media_entity *active_link_owner;
#endif
};
--
2.5.0
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