Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 344 insertions, 0 deletions

diff --git a/include/media/v4l2-async.h b/include/media/v4l2-async.h
new file mode 100644
index 0000000000..9bd326d311
--- /dev/null
+++ b/include/media/v4l2-async.h
@@ -0,0 +1,344 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * V4L2 asynchronous subdevice registration API
+ *
+ * Copyright (C) 2012-2013, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ */
+
+#ifndef V4L2_ASYNC_H
+#define V4L2_ASYNC_H
+
+#include <linux/list.h>
+#include <linux/mutex.h>
+
+struct dentry;
+struct device;
+struct device_node;
+struct v4l2_device;
+struct v4l2_subdev;
+struct v4l2_async_notifier;
+
+/**
+ * enum v4l2_async_match_type - type of asynchronous subdevice logic to be used
+ *	in order to identify a match
+ *
+ * @V4L2_ASYNC_MATCH_TYPE_I2C: Match will check for I2C adapter ID and address
+ * @V4L2_ASYNC_MATCH_TYPE_FWNODE: Match will use firmware node
+ *
+ * This enum is used by the asynchronous connection logic to define the
+ * algorithm that will be used to match an asynchronous device.
+ */
+enum v4l2_async_match_type {
+	V4L2_ASYNC_MATCH_TYPE_I2C,
+	V4L2_ASYNC_MATCH_TYPE_FWNODE,
+};
+
+/**
+ * struct v4l2_async_match_desc - async connection match information
+ *
+ * @type:	type of match that will be used
+ * @fwnode:	pointer to &struct fwnode_handle to be matched.
+ *		Used if @match_type is %V4L2_ASYNC_MATCH_TYPE_FWNODE.
+ * @i2c:	embedded struct with I2C parameters to be matched.
+ *		Both @match.i2c.adapter_id and @match.i2c.address
+ *		should be matched.
+ *		Used if @match_type is %V4L2_ASYNC_MATCH_TYPE_I2C.
+ * @i2c.adapter_id:
+ *		I2C adapter ID to be matched.
+ *		Used if @match_type is %V4L2_ASYNC_MATCH_TYPE_I2C.
+ * @i2c.address:
+ *		I2C address to be matched.
+ *		Used if @match_type is %V4L2_ASYNC_MATCH_TYPE_I2C.
+ */
+struct v4l2_async_match_desc {
+	enum v4l2_async_match_type type;
+	union {
+		struct fwnode_handle *fwnode;
+		struct {
+			int adapter_id;
+			unsigned short address;
+		} i2c;
+	};
+};
+
+/**
+ * struct v4l2_async_connection - sub-device connection descriptor, as known to
+ *				  a bridge
+ *
+ * @match:	struct of match type and per-bus type matching data sets
+ * @notifier:	the async notifier the connection is related to
+ * @asc_entry:	used to add struct v4l2_async_connection objects to the
+ *		notifier @waiting_list or @done_list
+ * @asc_subdev_entry:	entry in struct v4l2_async_subdev.asc_list list
+ * @sd:		the related sub-device
+ *
+ * When this struct is used as a member in a driver specific struct, the driver
+ * specific struct shall contain the &struct v4l2_async_connection as its first
+ * member.
+ */
+struct v4l2_async_connection {
+	struct v4l2_async_match_desc match;
+	struct v4l2_async_notifier *notifier;
+	struct list_head asc_entry;
+	struct list_head asc_subdev_entry;
+	struct v4l2_subdev *sd;
+};
+
+/**
+ * struct v4l2_async_notifier_operations - Asynchronous V4L2 notifier operations
+ * @bound:	a sub-device has been bound by the given connection
+ * @complete:	All connections have been bound successfully. The complete
+ *		callback is only executed for the root notifier.
+ * @unbind:	a subdevice is leaving
+ * @destroy:	the asc is about to be freed
+ */
+struct v4l2_async_notifier_operations {
+	int (*bound)(struct v4l2_async_notifier *notifier,
+		     struct v4l2_subdev *subdev,
+		     struct v4l2_async_connection *asc);
+	int (*complete)(struct v4l2_async_notifier *notifier);
+	void (*unbind)(struct v4l2_async_notifier *notifier,
+		       struct v4l2_subdev *subdev,
+		       struct v4l2_async_connection *asc);
+	void (*destroy)(struct v4l2_async_connection *asc);
+};
+
+/**
+ * struct v4l2_async_notifier - v4l2_device notifier data
+ *
+ * @ops:	notifier operations
+ * @v4l2_dev:	v4l2_device of the root notifier, NULL otherwise
+ * @sd:		sub-device that registered the notifier, NULL otherwise
+ * @parent:	parent notifier
+ * @waiting_list: list of struct v4l2_async_connection, waiting for their
+ *		  drivers
+ * @done_list:	list of struct v4l2_subdev, already probed
+ * @notifier_entry: member in a global list of notifiers
+ */
+struct v4l2_async_notifier {
+	const struct v4l2_async_notifier_operations *ops;
+	struct v4l2_device *v4l2_dev;
+	struct v4l2_subdev *sd;
+	struct v4l2_async_notifier *parent;
+	struct list_head waiting_list;
+	struct list_head done_list;
+	struct list_head notifier_entry;
+};
+
+/**
+ * struct v4l2_async_subdev_endpoint - Entry in sub-device's fwnode list
+ *
+ * @async_subdev_endpoint_entry: An entry in async_subdev_endpoint_list of
+ *				 &struct v4l2_subdev
+ * @endpoint: Endpoint fwnode agains which to match the sub-device
+ */
+struct v4l2_async_subdev_endpoint {
+	struct list_head async_subdev_endpoint_entry;
+	struct fwnode_handle *endpoint;
+};
+
+/**
+ * v4l2_async_debug_init - Initialize debugging tools.
+ *
+ * @debugfs_dir: pointer to the parent debugfs &struct dentry
+ */
+void v4l2_async_debug_init(struct dentry *debugfs_dir);
+
+/**
+ * v4l2_async_nf_init - Initialize a notifier.
+ *
+ * @notifier: pointer to &struct v4l2_async_notifier
+ * @v4l2_dev: pointer to &struct v4l2_device
+ *
+ * This function initializes the notifier @asc_entry. It must be called
+ * before adding a subdevice to a notifier, using one of:
+ * v4l2_async_nf_add_fwnode_remote(),
+ * v4l2_async_nf_add_fwnode() or
+ * v4l2_async_nf_add_i2c().
+ */
+void v4l2_async_nf_init(struct v4l2_async_notifier *notifier,
+			struct v4l2_device *v4l2_dev);
+
+/**
+ * v4l2_async_subdev_nf_init - Initialize a sub-device notifier.
+ *
+ * @notifier: pointer to &struct v4l2_async_notifier
+ * @sd: pointer to &struct v4l2_subdev
+ *
+ * This function initializes the notifier @asc_list. It must be called
+ * before adding a subdevice to a notifier, using one of:
+ * v4l2_async_nf_add_fwnode_remote(), v4l2_async_nf_add_fwnode() or
+ * v4l2_async_nf_add_i2c().
+ */
+void v4l2_async_subdev_nf_init(struct v4l2_async_notifier *notifier,
+			       struct v4l2_subdev *sd);
+
+struct v4l2_async_connection *
+__v4l2_async_nf_add_fwnode(struct v4l2_async_notifier *notifier,
+			   struct fwnode_handle *fwnode,
+			   unsigned int asc_struct_size);
+/**
+ * v4l2_async_nf_add_fwnode - Allocate and add a fwnode async
+ *				subdev to the notifier's master asc_list.
+ *
+ * @notifier: pointer to &struct v4l2_async_notifier
+ * @fwnode: fwnode handle of the sub-device to be matched, pointer to
+ *	    &struct fwnode_handle
+ * @type: Type of the driver's async sub-device or connection struct. The
+ *	  &struct v4l2_async_connection shall be the first member of the
+ *	  driver's async struct, i.e. both begin at the same memory address.
+ *
+ * Allocate a fwnode-matched asc of size asc_struct_size, and add it to the
+ * notifiers @asc_list. The function also gets a reference of the fwnode which
+ * is released later at notifier cleanup time.
+ */
+#define v4l2_async_nf_add_fwnode(notifier, fwnode, type)		\
+	((type *)__v4l2_async_nf_add_fwnode(notifier, fwnode, sizeof(type)))
+
+struct v4l2_async_connection *
+__v4l2_async_nf_add_fwnode_remote(struct v4l2_async_notifier *notif,
+				  struct fwnode_handle *endpoint,
+				  unsigned int asc_struct_size);
+/**
+ * v4l2_async_nf_add_fwnode_remote - Allocate and add a fwnode
+ *						  remote async subdev to the
+ *						  notifier's master asc_list.
+ *
+ * @notifier: pointer to &struct v4l2_async_notifier
+ * @ep: local endpoint pointing to the remote connection to be matched,
+ *	pointer to &struct fwnode_handle
+ * @type: Type of the driver's async connection struct. The &struct
+ *	  v4l2_async_connection shall be the first member of the driver's async
+ *	  connection struct, i.e. both begin at the same memory address.
+ *
+ * Gets the remote endpoint of a given local endpoint, set it up for fwnode
+ * matching and adds the async connection to the notifier's @asc_list. The
+ * function also gets a reference of the fwnode which is released later at
+ * notifier cleanup time.
+ *
+ * This is just like v4l2_async_nf_add_fwnode(), but with the
+ * exception that the fwnode refers to a local endpoint, not the remote one.
+ */
+#define v4l2_async_nf_add_fwnode_remote(notifier, ep, type) \
+	((type *)__v4l2_async_nf_add_fwnode_remote(notifier, ep, sizeof(type)))
+
+struct v4l2_async_connection *
+__v4l2_async_nf_add_i2c(struct v4l2_async_notifier *notifier,
+			int adapter_id, unsigned short address,
+			unsigned int asc_struct_size);
+/**
+ * v4l2_async_nf_add_i2c - Allocate and add an i2c async
+ *				subdev to the notifier's master asc_list.
+ *
+ * @notifier: pointer to &struct v4l2_async_notifier
+ * @adapter: I2C adapter ID to be matched
+ * @address: I2C address of connection to be matched
+ * @type: Type of the driver's async connection struct. The &struct
+ *	  v4l2_async_connection shall be the first member of the driver's async
+ *	  connection struct, i.e. both begin at the same memory address.
+ *
+ * Same as v4l2_async_nf_add_fwnode() but for I2C matched
+ * connections.
+ */
+#define v4l2_async_nf_add_i2c(notifier, adapter, address, type) \
+	((type *)__v4l2_async_nf_add_i2c(notifier, adapter, address, \
+					 sizeof(type)))
+
+/**
+ * v4l2_async_subdev_endpoint_add - Add an endpoint fwnode to async sub-device
+ *				    matching list
+ *
+ * @sd: the sub-device
+ * @fwnode: the endpoint fwnode to match
+ *
+ * Add a fwnode to the async sub-device's matching list. This allows registering
+ * multiple async sub-devices from a single device.
+ *
+ * Note that calling v4l2_subdev_cleanup() as part of the sub-device's cleanup
+ * if endpoints have been added to the sub-device's fwnode matching list.
+ *
+ * Returns an error on failure, 0 on success.
+ */
+int v4l2_async_subdev_endpoint_add(struct v4l2_subdev *sd,
+				   struct fwnode_handle *fwnode);
+
+/**
+ * v4l2_async_connection_unique - return a unique &struct v4l2_async_connection
+ *				  for a sub-device
+ * @sd: the sub-device
+ *
+ * Return an async connection for a sub-device, when there is a single
+ * one only.
+ */
+struct v4l2_async_connection *
+v4l2_async_connection_unique(struct v4l2_subdev *sd);
+
+/**
+ * v4l2_async_nf_register - registers a subdevice asynchronous notifier
+ *
+ * @notifier: pointer to &struct v4l2_async_notifier
+ */
+int v4l2_async_nf_register(struct v4l2_async_notifier *notifier);
+
+/**
+ * v4l2_async_nf_unregister - unregisters a subdevice
+ *	asynchronous notifier
+ *
+ * @notifier: pointer to &struct v4l2_async_notifier
+ */
+void v4l2_async_nf_unregister(struct v4l2_async_notifier *notifier);
+
+/**
+ * v4l2_async_nf_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
+ * connections 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_nf_add_fwnode_remote(),
+ * v4l2_async_nf_add_fwnode() or v4l2_async_nf_add_i2c().
+ *
+ * There is no harm from calling v4l2_async_nf_cleanup() in other
+ * cases as long as its memory has been zeroed after it has been
+ * allocated.
+ */
+void v4l2_async_nf_cleanup(struct v4l2_async_notifier *notifier);
+
+/**
+ * v4l2_async_register_subdev - registers a sub-device to the asynchronous
+ *	subdevice framework
+ *
+ * @sd: pointer to &struct v4l2_subdev
+ */
+int v4l2_async_register_subdev(struct v4l2_subdev *sd);
+
+/**
+ * v4l2_async_register_subdev_sensor - 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_nf_parse_fwnode_sensor() 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(struct v4l2_subdev *sd);
+
+/**
+ * v4l2_async_unregister_subdev - unregisters a sub-device to the asynchronous
+ *	subdevice framework
+ *
+ * @sd: pointer to &struct v4l2_subdev
+ */
+void v4l2_async_unregister_subdev(struct v4l2_subdev *sd);
+#endif