mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 04:18:39 +08:00
8a718752f5
Set the owner field of the async sub-devices by making v4l2_async_register_subdev() a macro and obtaining THIS_MODULE that way. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
347 lines
12 KiB
C
347 lines
12 KiB
C
/* 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
|
|
*/
|
|
#define v4l2_async_register_subdev(sd) \
|
|
__v4l2_async_register_subdev(sd, THIS_MODULE)
|
|
int __v4l2_async_register_subdev(struct v4l2_subdev *sd, struct module *module);
|
|
|
|
/**
|
|
* 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
|