Merge tag 'media/v4.15-1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media

Pull media updates from Mauro Carvalho Chehab:

 - Documentation for digital TV (both kAPI and uAPI) are now in sync
   with the implementation (except for legacy/deprecated ioctls). This
   is a major step, as there were always a gap there

 - New sensor driver: imx274

 - New cec driver: cec-gpio

 - New platform driver for rockship rga and tegra CEC

 - New RC driver: tango-ir

 - Several cleanups at atomisp driver

 - Core improvements for RC, CEC, V4L2 async probing support and DVB

 - Lots of drivers cleanup, fixes and improvements.

* tag 'media/v4.15-1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (332 commits)
  dvb_frontend: don't use-after-free the frontend struct
  media: dib0700: fix invalid dvb_detach argument
  media: v4l2-ctrls: Don't validate BITMASK twice
  media: s5p-mfc: fix lockdep warning
  media: dvb-core: always call invoke_release() in fe_free()
  media: usb: dvb-usb-v2: dvb_usb_core: remove redundant code in dvb_usb_fe_sleep
  media: au0828: make const array addr_list static
  media: cx88: make const arrays default_addr_list and pvr2000_addr_list static
  media: drxd: make const array fastIncrDecLUT static
  media: usb: fix spelling mistake: "synchronuously" -> "synchronously"
  media: ddbridge: fix build warnings
  media: av7110: avoid 2038 overflow in debug print
  media: Don't do DMA on stack for firmware upload in the AS102 driver
  media: v4l: async: fix unregister for implicitly registered sub-device notifiers
  media: v4l: async: fix return of unitialized variable ret
  media: imx274: fix missing return assignment from call to imx274_mode_regs
  media: camss-vfe: always initialize reg at vfe_set_xbar_cfg()
  media: atomisp: make function calls cleaner
  media: atomisp: get rid of storage_class.h
  media: atomisp: get rid of wrong stddef.h include
  ...

1 files changed, 79 insertions, 12 deletions

diff --git a/include/media/v4l2-async.h b/include/media/v4l2-async.h
index c69d8c8a66d0..6152434cbe82 100644
--- a/include/media/v4l2-async.h
+++ b/include/media/v4l2-async.h
@@ -50,6 +50,10 @@ enum v4l2_async_match_type {
  * @match:	union of per-bus type matching data sets
  * @list:	used to link struct v4l2_async_subdev objects, waiting to be
  *		probed, to a notifier->waiting list
+ *
+ * When this struct is used as a member in a driver specific struct,
+ * the driver specific struct shall contain the &struct
+ * v4l2_async_subdev as its first member.
  */
 struct v4l2_async_subdev {
 	enum v4l2_async_match_type match_type;
@@ -76,32 +80,47 @@ struct v4l2_async_subdev {
 };
 
 /**
+ * struct v4l2_async_notifier_operations - Asynchronous V4L2 notifier operations
+ * @bound:	a subdevice driver has successfully probed one of the subdevices
+ * @complete:	All subdevices have been probed successfully. The complete
+ *		callback is only executed for the root notifier.
+ * @unbind:	a subdevice is leaving
+ */
+struct v4l2_async_notifier_operations {
+	int (*bound)(struct v4l2_async_notifier *notifier,
+		     struct v4l2_subdev *subdev,
+		     struct v4l2_async_subdev *asd);
+	int (*complete)(struct v4l2_async_notifier *notifier);
+	void (*unbind)(struct v4l2_async_notifier *notifier,
+		       struct v4l2_subdev *subdev,
+		       struct v4l2_async_subdev *asd);
+};
+
+/**
  * struct v4l2_async_notifier - v4l2_device notifier data
  *
- * @num_subdevs: number of subdevices
+ * @ops:	notifier operations
+ * @num_subdevs: number of subdevices used in the subdevs array
+ * @max_subdevs: number of subdevices allocated in the subdevs array
  * @subdevs:	array of pointers to subdevice descriptors
- * @v4l2_dev:	pointer to struct v4l2_device
+ * @v4l2_dev:	v4l2_device of the root notifier, NULL otherwise
+ * @sd:		sub-device that registered the notifier, NULL otherwise
+ * @parent:	parent notifier
  * @waiting:	list of struct v4l2_async_subdev, waiting for their drivers
  * @done:	list of struct v4l2_subdev, already probed
  * @list:	member in a global list of notifiers
- * @bound:	a subdevice driver has successfully probed one of subdevices
- * @complete:	all subdevices have been probed successfully
- * @unbind:	a subdevice is leaving
  */
 struct v4l2_async_notifier {
+	const struct v4l2_async_notifier_operations *ops;
 	unsigned int num_subdevs;
+	unsigned int max_subdevs;
 	struct v4l2_async_subdev **subdevs;
 	struct v4l2_device *v4l2_dev;
+	struct v4l2_subdev *sd;
+	struct v4l2_async_notifier *parent;
 	struct list_head waiting;
 	struct list_head done;
 	struct list_head list;
-	int (*bound)(struct v4l2_async_notifier *notifier,
-		     struct v4l2_subdev *subdev,
-		     struct v4l2_async_subdev *asd);
-	int (*complete)(struct v4l2_async_notifier *notifier);
-	void (*unbind)(struct v4l2_async_notifier *notifier,
-		       struct v4l2_subdev *subdev,
-		       struct v4l2_async_subdev *asd);
 };
 
 /**
@@ -114,6 +133,16 @@ int v4l2_async_notifier_register(struct v4l2_device *v4l2_dev,
 				 struct v4l2_async_notifier *notifier);
 
 /**
+ * v4l2_async_subdev_notifier_register - registers a subdevice asynchronous
+ *					 notifier for a sub-device
+ *
+ * @sd: pointer to &struct v4l2_subdev
+ * @notifier: pointer to &struct v4l2_async_notifier
+ */
+int v4l2_async_subdev_notifier_register(struct v4l2_subdev *sd,
+					struct v4l2_async_notifier *notifier);
+
+/**
  * v4l2_async_notifier_unregister - unregisters a subdevice asynchronous notifier
  *
  * @notifier: pointer to &struct v4l2_async_notifier
@@ -121,6 +150,22 @@ int v4l2_async_notifier_register(struct v4l2_device *v4l2_dev,
 void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier);
 
 /**
+ * v4l2_async_notifier_cleanup - clean up notifier resources
+ * @notifier: the notifier the resources of which are to be cleaned up
+ *
+ * Release memory resources related to a notifier, including the async
+ * sub-devices allocated for the purposes of the notifier but not the notifier
+ * itself. The user is responsible for calling this function to clean up the
+ * notifier after calling @v4l2_async_notifier_parse_fwnode_endpoints or
+ * @v4l2_fwnode_reference_parse_sensor_common.
+ *
+ * There is no harm from calling v4l2_async_notifier_cleanup in other
+ * cases as long as its memory has been zeroed after it has been
+ * allocated.
+ */
+void v4l2_async_notifier_cleanup(struct v4l2_async_notifier *notifier);
+
+/**
  * v4l2_async_register_subdev - registers a sub-device to the asynchronous
  * 	subdevice framework
  *
@@ -129,6 +174,28 @@ void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier);
 int v4l2_async_register_subdev(struct v4l2_subdev *sd);
 
 /**
+ * v4l2_async_register_subdev_sensor_common - registers a sensor sub-device to
+ *					      the asynchronous sub-device
+ *					      framework and parse set up common
+ *					      sensor related devices
+ *
+ * @sd: pointer to struct &v4l2_subdev
+ *
+ * This function is just like v4l2_async_register_subdev() with the exception
+ * that calling it will also parse firmware interfaces for remote references
+ * using v4l2_async_notifier_parse_fwnode_sensor_common() and registers the
+ * async sub-devices. The sub-device is similarly unregistered by calling
+ * v4l2_async_unregister_subdev().
+ *
+ * While registered, the subdev module is marked as in-use.
+ *
+ * An error is returned if the module is no longer loaded on any attempts
+ * to register it.
+ */
+int __must_check v4l2_async_register_subdev_sensor_common(
+	struct v4l2_subdev *sd);
+
+/**
  * v4l2_async_unregister_subdev - unregisters a sub-device to the asynchronous
  * 	subdevice framework
  *