317 lines
11 KiB
C
317 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* V4L2 asynchronous subdevice registration API
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*
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* Copyright (C) 2012-2013, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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*/
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#ifndef V4L2_ASYNC_H
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#define V4L2_ASYNC_H
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#include <linux/list.h>
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#include <linux/mutex.h>
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struct dentry;
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struct device;
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struct device_node;
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struct v4l2_device;
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struct v4l2_subdev;
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struct v4l2_async_notifier;
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/**
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* enum v4l2_async_match_type - type of asynchronous subdevice logic to be used
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* in order to identify a match
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*
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* @V4L2_ASYNC_MATCH_I2C: Match will check for I2C adapter ID and address
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* @V4L2_ASYNC_MATCH_FWNODE: Match will use firmware node
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*
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* This enum is used by the asynchronous sub-device logic to define the
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* algorithm that will be used to match an asynchronous device.
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*/
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enum v4l2_async_match_type {
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V4L2_ASYNC_MATCH_I2C,
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V4L2_ASYNC_MATCH_FWNODE,
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};
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/**
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* struct v4l2_async_subdev - sub-device descriptor, as known to a bridge
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*
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* @match_type: type of match that will be used
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* @match: union of per-bus type matching data sets
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* @match.fwnode:
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* pointer to &struct fwnode_handle to be matched.
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* Used if @match_type is %V4L2_ASYNC_MATCH_FWNODE.
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* @match.i2c: embedded struct with I2C parameters to be matched.
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* Both @match.i2c.adapter_id and @match.i2c.address
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* should be matched.
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* Used if @match_type is %V4L2_ASYNC_MATCH_I2C.
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* @match.i2c.adapter_id:
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* I2C adapter ID to be matched.
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* Used if @match_type is %V4L2_ASYNC_MATCH_I2C.
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* @match.i2c.address:
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* I2C address to be matched.
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* Used if @match_type is %V4L2_ASYNC_MATCH_I2C.
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* @asd_list: used to add struct v4l2_async_subdev objects to the
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* master notifier @asd_list
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* @list: used to link struct v4l2_async_subdev objects, waiting to be
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* probed, to a notifier->waiting list
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*
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* When this struct is used as a member in a driver specific struct,
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* the driver specific struct shall contain the &struct
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* v4l2_async_subdev as its first member.
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*/
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struct v4l2_async_subdev {
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enum v4l2_async_match_type match_type;
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union {
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struct fwnode_handle *fwnode;
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struct {
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int adapter_id;
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unsigned short address;
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} i2c;
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} match;
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/* v4l2-async core private: not to be used by drivers */
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struct list_head list;
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struct list_head asd_list;
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};
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/**
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* struct v4l2_async_notifier_operations - Asynchronous V4L2 notifier operations
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* @bound: a subdevice driver has successfully probed one of the subdevices
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* @complete: All subdevices have been probed successfully. The complete
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* callback is only executed for the root notifier.
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* @unbind: a subdevice is leaving
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* @destroy: the asd is about to be freed
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*/
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struct v4l2_async_notifier_operations {
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int (*bound)(struct v4l2_async_notifier *notifier,
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struct v4l2_subdev *subdev,
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struct v4l2_async_subdev *asd);
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int (*complete)(struct v4l2_async_notifier *notifier);
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void (*unbind)(struct v4l2_async_notifier *notifier,
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struct v4l2_subdev *subdev,
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struct v4l2_async_subdev *asd);
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void (*destroy)(struct v4l2_async_subdev *asd);
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};
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/**
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* struct v4l2_async_notifier - v4l2_device notifier data
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*
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* @ops: notifier operations
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* @v4l2_dev: v4l2_device of the root notifier, NULL otherwise
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* @sd: sub-device that registered the notifier, NULL otherwise
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* @parent: parent notifier
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* @asd_list: master list of struct v4l2_async_subdev
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* @waiting: list of struct v4l2_async_subdev, waiting for their drivers
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* @done: list of struct v4l2_subdev, already probed
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* @list: member in a global list of notifiers
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*/
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struct v4l2_async_notifier {
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const struct v4l2_async_notifier_operations *ops;
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struct v4l2_device *v4l2_dev;
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struct v4l2_subdev *sd;
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struct v4l2_async_notifier *parent;
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struct list_head asd_list;
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struct list_head waiting;
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struct list_head done;
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struct list_head list;
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};
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/**
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* v4l2_async_debug_init - Initialize debugging tools.
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*
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* @debugfs_dir: pointer to the parent debugfs &struct dentry
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*/
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void v4l2_async_debug_init(struct dentry *debugfs_dir);
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/**
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* v4l2_async_nf_init - Initialize a notifier.
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*
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* @notifier: pointer to &struct v4l2_async_notifier
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*
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* This function initializes the notifier @asd_list. It must be called
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* before adding a subdevice to a notifier, using one of:
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* v4l2_async_nf_add_fwnode_remote(),
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* v4l2_async_nf_add_fwnode(),
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* v4l2_async_nf_add_i2c(),
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* __v4l2_async_nf_add_subdev() or
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* v4l2_async_nf_parse_fwnode_endpoints().
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*/
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void v4l2_async_nf_init(struct v4l2_async_notifier *notifier);
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/**
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* __v4l2_async_nf_add_subdev - Add an async subdev to the
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* notifier's master asd list.
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*
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* @notifier: pointer to &struct v4l2_async_notifier
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* @asd: pointer to &struct v4l2_async_subdev
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*
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* \warning: Drivers should avoid using this function and instead use one of:
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* v4l2_async_nf_add_fwnode(),
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* v4l2_async_nf_add_fwnode_remote() or
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* v4l2_async_nf_add_i2c().
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*
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* Call this function before registering a notifier to link the provided @asd to
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* the notifiers master @asd_list. The @asd must be allocated with k*alloc() as
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* it will be freed by the framework when the notifier is destroyed.
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*/
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int __v4l2_async_nf_add_subdev(struct v4l2_async_notifier *notifier,
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struct v4l2_async_subdev *asd);
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struct v4l2_async_subdev *
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__v4l2_async_nf_add_fwnode(struct v4l2_async_notifier *notifier,
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struct fwnode_handle *fwnode,
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unsigned int asd_struct_size);
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/**
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* v4l2_async_nf_add_fwnode - Allocate and add a fwnode async
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* subdev to the notifier's master asd_list.
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*
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* @notifier: pointer to &struct v4l2_async_notifier
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* @fwnode: fwnode handle of the sub-device to be matched, pointer to
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* &struct fwnode_handle
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* @type: Type of the driver's async sub-device struct. The &struct
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* v4l2_async_subdev shall be the first member of the driver's async
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* sub-device struct, i.e. both begin at the same memory address.
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*
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* Allocate a fwnode-matched asd of size asd_struct_size, and add it to the
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* notifiers @asd_list. The function also gets a reference of the fwnode which
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* is released later at notifier cleanup time.
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*/
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#define v4l2_async_nf_add_fwnode(notifier, fwnode, type) \
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((type *)__v4l2_async_nf_add_fwnode(notifier, fwnode, sizeof(type)))
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struct v4l2_async_subdev *
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__v4l2_async_nf_add_fwnode_remote(struct v4l2_async_notifier *notif,
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struct fwnode_handle *endpoint,
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unsigned int asd_struct_size);
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/**
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* v4l2_async_nf_add_fwnode_remote - Allocate and add a fwnode
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* remote async subdev to the
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* notifier's master asd_list.
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*
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* @notifier: pointer to &struct v4l2_async_notifier
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* @ep: local endpoint pointing to the remote sub-device to be matched,
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* pointer to &struct fwnode_handle
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* @type: Type of the driver's async sub-device struct. The &struct
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* v4l2_async_subdev shall be the first member of the driver's async
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* sub-device struct, i.e. both begin at the same memory address.
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*
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* Gets the remote endpoint of a given local endpoint, set it up for fwnode
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* matching and adds the async sub-device to the notifier's @asd_list. The
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* function also gets a reference of the fwnode which is released later at
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* notifier cleanup time.
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*
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* This is just like v4l2_async_nf_add_fwnode(), but with the
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* exception that the fwnode refers to a local endpoint, not the remote one.
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*/
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#define v4l2_async_nf_add_fwnode_remote(notifier, ep, type) \
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((type *)__v4l2_async_nf_add_fwnode_remote(notifier, ep, sizeof(type)))
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struct v4l2_async_subdev *
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__v4l2_async_nf_add_i2c(struct v4l2_async_notifier *notifier,
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int adapter_id, unsigned short address,
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unsigned int asd_struct_size);
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/**
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* v4l2_async_nf_add_i2c - Allocate and add an i2c async
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* subdev to the notifier's master asd_list.
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*
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* @notifier: pointer to &struct v4l2_async_notifier
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* @adapter: I2C adapter ID to be matched
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* @address: I2C address of sub-device to be matched
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* @type: Type of the driver's async sub-device struct. The &struct
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* v4l2_async_subdev shall be the first member of the driver's async
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* sub-device struct, i.e. both begin at the same memory address.
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*
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* Same as v4l2_async_nf_add_fwnode() but for I2C matched
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* sub-devices.
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*/
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#define v4l2_async_nf_add_i2c(notifier, adapter, address, type) \
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((type *)__v4l2_async_nf_add_i2c(notifier, adapter, address, \
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sizeof(type)))
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/**
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* v4l2_async_nf_register - registers a subdevice asynchronous notifier
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*
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* @v4l2_dev: pointer to &struct v4l2_device
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* @notifier: pointer to &struct v4l2_async_notifier
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*/
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int v4l2_async_nf_register(struct v4l2_device *v4l2_dev,
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struct v4l2_async_notifier *notifier);
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/**
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* v4l2_async_subdev_nf_register - registers a subdevice asynchronous
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* notifier for a sub-device
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*
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* @sd: pointer to &struct v4l2_subdev
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* @notifier: pointer to &struct v4l2_async_notifier
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*/
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int v4l2_async_subdev_nf_register(struct v4l2_subdev *sd,
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struct v4l2_async_notifier *notifier);
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/**
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* v4l2_async_nf_unregister - unregisters a subdevice
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* asynchronous notifier
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*
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* @notifier: pointer to &struct v4l2_async_notifier
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*/
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void v4l2_async_nf_unregister(struct v4l2_async_notifier *notifier);
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/**
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* v4l2_async_nf_cleanup - clean up notifier resources
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* @notifier: the notifier the resources of which are to be cleaned up
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*
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* Release memory resources related to a notifier, including the async
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* sub-devices allocated for the purposes of the notifier but not the notifier
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* itself. The user is responsible for calling this function to clean up the
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* notifier after calling
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* v4l2_async_nf_add_fwnode_remote(),
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* v4l2_async_nf_add_fwnode(),
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* v4l2_async_nf_add_i2c(),
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* __v4l2_async_nf_add_subdev() or
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* v4l2_async_nf_parse_fwnode_endpoints().
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*
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* There is no harm from calling v4l2_async_nf_cleanup() in other
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* cases as long as its memory has been zeroed after it has been
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* allocated.
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*/
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void v4l2_async_nf_cleanup(struct v4l2_async_notifier *notifier);
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/**
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* v4l2_async_register_subdev - registers a sub-device to the asynchronous
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* subdevice framework
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*
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* @sd: pointer to &struct v4l2_subdev
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*/
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int v4l2_async_register_subdev(struct v4l2_subdev *sd);
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/**
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* v4l2_async_register_subdev_sensor - registers a sensor sub-device to the
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* asynchronous sub-device framework and
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* parse set up common sensor related
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* devices
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*
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* @sd: pointer to struct &v4l2_subdev
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*
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* This function is just like v4l2_async_register_subdev() with the exception
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* that calling it will also parse firmware interfaces for remote references
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* using v4l2_async_nf_parse_fwnode_sensor() and registers the
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* async sub-devices. The sub-device is similarly unregistered by calling
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* v4l2_async_unregister_subdev().
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*
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* While registered, the subdev module is marked as in-use.
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*
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* An error is returned if the module is no longer loaded on any attempts
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* to register it.
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*/
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int __must_check
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v4l2_async_register_subdev_sensor(struct v4l2_subdev *sd);
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/**
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* v4l2_async_unregister_subdev - unregisters a sub-device to the asynchronous
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* subdevice framework
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*
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* @sd: pointer to &struct v4l2_subdev
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*/
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void v4l2_async_unregister_subdev(struct v4l2_subdev *sd);
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#endif
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