206 lines
6.5 KiB
C
206 lines
6.5 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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 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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/* A random max subdevice number, used to allocate an array on stack */
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#define V4L2_MAX_SUBDEVS 128U
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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_CUSTOM: Match will use the logic provided by &struct
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* v4l2_async_subdev.match ops
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* @V4L2_ASYNC_MATCH_DEVNAME: Match will use the device name
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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 asyncrhronous 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_CUSTOM,
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V4L2_ASYNC_MATCH_DEVNAME,
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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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* @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 {
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struct fwnode_handle *fwnode;
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} fwnode;
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struct {
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const char *name;
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} device_name;
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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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struct {
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bool (*match)(struct device *,
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struct v4l2_async_subdev *);
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void *priv;
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} custom;
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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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};
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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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*/
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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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};
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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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* @num_subdevs: number of subdevices used in the subdevs array
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* @max_subdevs: number of subdevices allocated in the subdevs array
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* @subdevs: array of pointers to subdevice descriptors
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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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* @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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unsigned int num_subdevs;
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unsigned int max_subdevs;
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struct v4l2_async_subdev **subdevs;
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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 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_notifier_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_notifier_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_notifier_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_notifier_register(struct v4l2_subdev *sd,
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struct v4l2_async_notifier *notifier);
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/**
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* v4l2_async_notifier_unregister - unregisters a subdevice 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_notifier_unregister(struct v4l2_async_notifier *notifier);
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/**
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* v4l2_async_notifier_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 @v4l2_async_notifier_parse_fwnode_endpoints or
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* @v4l2_fwnode_reference_parse_sensor_common.
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*
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* There is no harm from calling v4l2_async_notifier_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_notifier_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_common - registers a sensor sub-device to
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* the asynchronous sub-device
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* framework and parse set up common
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* sensor related 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_notifier_parse_fwnode_sensor_common() 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 v4l2_async_register_subdev_sensor_common(
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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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