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Groups > linux.kernel > #1332456

[PATCH v3 06/22] media: Media Controller enable/disable source handler API

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Add new fields to struct media_device to add enable_source, and
disable_source handlers, and source_priv to stash driver private
data that is used to run these handlers. The enable_source handler
finds source entity for the passed in entity and checks if it is
available. When link is found, it activates it. Disable source
handler deactivates the link.

Bridge driver is expected to implement and set these handlers.

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
---
 include/media/media-device.h | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/include/media/media-device.h b/include/media/media-device.h
index 075a482..1a04644 100644
--- a/include/media/media-device.h
+++ b/include/media/media-device.h
@@ -302,6 +302,11 @@ struct media_entity_notify {
  * @entity_notify: List of registered entity_notify callbacks
  * @lock:	Entities list lock
  * @graph_mutex: Entities graph operation lock
+ *
+ * @source_priv: Driver Private data for enable/disable source handlers
+ * @enable_source: Enable Source Handler function pointer
+ * @disable_source: Disable Source Handler function pointer
+ *
  * @link_notify: Link state change notification callback
  *
  * This structure represents an abstract high-level media device. It allows easy
@@ -313,6 +318,26 @@ struct media_entity_notify {
  *
  * @model is a descriptive model name exported through sysfs. It doesn't have to
  * be unique.
+ *
+ * @enable_source is a handler to find source entity for the
+ * sink entity  and activate the link between them if source
+ * entity is free. Drivers should call this handler before
+ * accessing the source.
+ *
+ * @disable_source is a handler to find source entity for the
+ * sink entity  and deactivate the link between them. Drivers
+ * should call this handler to release the source.
+ *
+ * Note: Bridge driver is expected to implement and set the
+ * handler when media_device is registered or when
+ * bridge driver finds the media_device during probe.
+ * Bridge driver sets source_priv with information
+ * necessary to run enable/disable source handlers.
+ *
+ * Use-case: find tuner entity connected to the decoder
+ * entity and check if it is available, and activate the
+ * the link between them from enable_source and deactivate
+ * from disable_source.
  */
 struct media_device {
 	/* dev->driver_data points to this struct. */
@@ -344,6 +369,11 @@ struct media_device {
 	/* Serializes graph operations. */
 	struct mutex graph_mutex;
 
+	void *source_priv;
+	int (*enable_source)(struct media_entity *entity,
+			     struct media_pipeline *pipe);
+	void (*disable_source)(struct media_entity *entity);
+
 	int (*link_notify)(struct media_link *link, u32 flags,
 			   unsigned int notification);
 };
-- 
2.5.0

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[PATCH v3 00/22] Sharing media resources across ALSA and au0828 drivers Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 00:50 +0100
  [PATCH v3 02/22] uapi/media.h: Declare interface types for ALSA Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 00:50 +0100
    Re: [PATCH v3 02/22] uapi/media.h: Declare interface types for ALSA Mauro Carvalho Chehab <mchehab@osg.samsung.com> - 2016-02-17 13:30 +0100
  [PATCH v3 18/22] media: au0828-core register entity_notify hook Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 00:50 +0100
  [PATCH v3 16/22] media: au0828 create tuner to decoder link in disabled state Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 00:50 +0100
  [PATCH v3 03/22] [media] Docbook: media-types.xml: Add Audio Function Entities Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 00:50 +0100
    Re: [PATCH v3 03/22] [media] Docbook: media-types.xml: Add Audio  Function Entities Mauro Carvalho Chehab <mchehab@osg.samsung.com> - 2016-02-17 13:30 +0100
  [PATCH v3 05/22] media: Media Controller register/unregister entity_notify API Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 00:50 +0100
  [PATCH v3 21/22] media: au0828 video change to use v4l_enable_media_source() Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 00:50 +0100
  [PATCH v3 20/22] media: dvb-frontend invoke enable/disable_source handlers Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 00:50 +0100
  [PATCH v3 01/22] [media] Docbook: media-types.xml: Add ALSA Media Controller Intf types Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 00:50 +0100
    Re: [PATCH v3 01/22] [media] Docbook: media-types.xml: Add ALSA  Media Controller Intf types Mauro Carvalho Chehab <mchehab@osg.samsung.com> - 2016-02-17 13:30 +0100
      Re: [PATCH v3 01/22] [media] Docbook: media-types.xml: Add ALSA Media  Controller Intf types Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-17 16:00 +0100
  [PATCH v3 22/22] sound/usb: Use Media Controller API to share media resources Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 00:50 +0100
  [PATCH v3 12/22] media: au0828 Use au8522_media_pads enum for pad defines Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 01:00 +0100
  [PATCH v3 06/22] media: Media Controller enable/disable source handler API Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 01:00 +0100
  [PATCH v3 09/22] media: v4l-core add enable/disable source common interfaces Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 01:00 +0100
  [PATCH v3 08/22] media: Media Controller non-locking __media_entity_pipeline_start/stop() Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 01:00 +0100
  [PATCH v3 11/22] media: au8522 change to create MC pad for ALSA Audio Out Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 01:00 +0100
  [PATCH v3 07/22] media: Media Controller export non locking __media_entity_setup_link() Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-12 01:00 +0100

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