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/* 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 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_CUSTOM: Match will use the logic provided by &struct * v4l2_async_subdev.match ops * @V4L2_ASYNC_MATCH_DEVNAME: Match will use the device name * @V4L2_ASYNC_MATCH_I2C: Match will check for I2C adapter ID and address * @V4L2_ASYNC_MATCH_FWNODE: Match will use firmware node * * This enum is used by the asyncrhronous sub-device logic to define the * algorithm that will be used to match an asynchronous device. / enum v4l2_async_match_type { V4L2_ASYNC_MATCH_CUSTOM, V4L2_ASYNC_MATCH_DEVNAME, V4L2_ASYNC_MATCH_I2C, V4L2_ASYNC_MATCH_FWNODE, }; /* * struct v4l2_async_subdev - sub-device descriptor, as known to a bridge * * @match_type: type of match that will be used * @match: union of per-bus type matching data sets * @match.fwnode: * pointer to &struct fwnode_handle to be matched. * Used if @match_type is %V4L2_ASYNC_MATCH_FWNODE. * @match.device_name: * string containing the device name to be matched. * Used if @match_type is %V4L2_ASYNC_MATCH_DEVNAME. * @match.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_I2C. * @match.i2c.adapter_id: * I2C adapter ID to be matched. * Used if @match_type is %V4L2_ASYNC_MATCH_I2C. * @match.i2c.address: * I2C address to be matched. * Used if @match_type is %V4L2_ASYNC_MATCH_I2C. * @match.custom: * Driver-specific match criteria. * Used if @match_type is %V4L2_ASYNC_MATCH_CUSTOM. * @match.custom.match: * Driver-specific match function to be used if * %V4L2_ASYNC_MATCH_CUSTOM. * @match.custom.priv: * Driver-specific private struct with match parameters * to be used if %V4L2_ASYNC_MATCH_CUSTOM. * @asd_list: used to add struct v4l2_async_subdev objects to the * master notifier @asd_list * @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; union { struct fwnode_handle fwnode; const char device_name; struct { int adapter_id; unsigned short address; } i2c; struct { bool (match)(struct device dev, struct v4l2_async_subdev sd); void priv; } custom; } match; / v4l2-async core private: not to be used by drivers / struct list_head list; struct list_head asd_list; }; /* * 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 * * @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 * @asd_list: master list of struct v4l2_async_subdev * @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 / 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 asd_list; struct list_head waiting; struct list_head done; struct list_head list; }; /* * v4l2_async_notifier_init - Initialize a notifier. * * @notifier: pointer to &struct v4l2_async_notifier * * This function initializes the notifier @asd_list. It must be called * before the first call to @v4l2_async_notifier_add_subdev. / void v4l2_async_notifier_init(struct v4l2_async_notifier notifier); /** * v4l2_async_notifier_add_subdev - Add an async subdev to the * notifier's master asd list. * * @notifier: pointer to &struct v4l2_async_notifier * @asd: pointer to &struct v4l2_async_subdev * * Call this function before registering a notifier to link the * provided asd to the notifiers master @asd_list. / int v4l2_async_notifier_add_subdev(struct v4l2_async_notifier notifier, struct v4l2_async_subdev asd); /* * v4l2_async_notifier_add_fwnode_subdev - Allocate and add a fwnode async * subdev to the notifier's master asd_list. * * @notifier: pointer to &struct v4l2_async_notifier * @fwnode: fwnode handle of the sub-device to be matched * @asd_struct_size: size of the driver's async sub-device struct, including * sizeof(struct v4l2_async_subdev). The &struct * v4l2_async_subdev shall be the first member of * the driver's async sub-device struct, i.e. both * begin at the same memory address. * * Allocate a fwnode-matched asd of size asd_struct_size, and add it to the * notifiers @asd_list. The function also gets a reference of the fwnode which * is released later at notifier cleanup time. / struct v4l2_async_subdev v4l2_async_notifier_add_fwnode_subdev(struct v4l2_async_notifier notifier, struct fwnode_handle fwnode, unsigned int asd_struct_size); /** * v4l2_async_notifier_add_fwnode_remote_subdev - Allocate and add a fwnode * remote async subdev to the * notifier's master asd_list. * * @notif: pointer to &struct v4l2_async_notifier * @endpoint: local endpoint pointing to the remote sub-device to be matched * @asd: Async sub-device struct allocated by the caller. The &struct * v4l2_async_subdev shall be the first member of the driver's async * sub-device 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 sub-device to the notifier's @asd_list. The * function also gets a reference of the fwnode which is released later at * notifier cleanup time. * * This is just like @v4l2_async_notifier_add_fwnode_subdev, but with the * exception that the fwnode refers to a local endpoint, not the remote one, and * the function relies on the caller to allocate the async sub-device struct. / int v4l2_async_notifier_add_fwnode_remote_subdev(struct v4l2_async_notifier notif, struct fwnode_handle endpoint, struct v4l2_async_subdev asd); /** * v4l2_async_notifier_add_i2c_subdev - Allocate and add an i2c async * subdev to the notifier's master asd_list. * * @notifier: pointer to &struct v4l2_async_notifier * @adapter_id: I2C adapter ID to be matched * @address: I2C address of sub-device to be matched * @asd_struct_size: size of the driver's async sub-device struct, including * sizeof(struct v4l2_async_subdev). The &struct * v4l2_async_subdev shall be the first member of * the driver's async sub-device struct, i.e. both * begin at the same memory address. * * Same as above but for I2C matched sub-devices. / struct v4l2_async_subdev v4l2_async_notifier_add_i2c_subdev(struct v4l2_async_notifier notifier, int adapter_id, unsigned short address, unsigned int asd_struct_size); /* * v4l2_async_notifier_add_devname_subdev - Allocate and add a device-name * async subdev to the notifier's master asd_list. * * @notifier: pointer to &struct v4l2_async_notifier * @device_name: device name string to be matched * @asd_struct_size: size of the driver's async sub-device struct, including * sizeof(struct v4l2_async_subdev). The &struct * v4l2_async_subdev shall be the first member of * the driver's async sub-device struct, i.e. both * begin at the same memory address. * * Same as above but for device-name matched sub-devices. / struct v4l2_async_subdev v4l2_async_notifier_add_devname_subdev(struct v4l2_async_notifier notifier, const char device_name, unsigned int asd_struct_size); /** * v4l2_async_notifier_register - registers a subdevice asynchronous notifier * * @v4l2_dev: pointer to &struct v4l2_device * @notifier: pointer to &struct v4l2_async_notifier / 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 / 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_add_subdev, * @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 * * @sd: pointer to &struct v4l2_subdev / 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 * * @sd: pointer to &struct v4l2_subdev / void v4l2_async_unregister_subdev(struct v4l2_subdev sd); #endif

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