567 lines
18 KiB
C
567 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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V4L2 device support header.
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Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
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*/
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#ifndef _V4L2_DEVICE_H
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#define _V4L2_DEVICE_H
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#include <media/media-device.h>
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#include <media/v4l2-subdev.h>
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#include <media/v4l2-dev.h>
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struct v4l2_ctrl_handler;
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/**
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* struct v4l2_device - main struct to for V4L2 device drivers
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*
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* @dev: pointer to struct device.
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* @mdev: pointer to struct media_device, may be NULL.
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* @subdevs: used to keep track of the registered subdevs
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* @lock: lock this struct; can be used by the driver as well
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* if this struct is embedded into a larger struct.
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* @name: unique device name, by default the driver name + bus ID
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* @notify: notify operation called by some sub-devices.
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* @ctrl_handler: The control handler. May be %NULL.
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* @prio: Device's priority state
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* @ref: Keep track of the references to this struct.
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* @release: Release function that is called when the ref count
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* goes to 0.
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*
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* Each instance of a V4L2 device should create the v4l2_device struct,
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* either stand-alone or embedded in a larger struct.
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*
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* It allows easy access to sub-devices (see v4l2-subdev.h) and provides
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* basic V4L2 device-level support.
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*
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* .. note::
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*
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* #) @dev->driver_data points to this struct.
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* #) @dev might be %NULL if there is no parent device
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*/
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struct v4l2_device {
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struct device *dev;
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struct media_device *mdev;
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struct list_head subdevs;
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spinlock_t lock;
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char name[36];
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void (*notify)(struct v4l2_subdev *sd,
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unsigned int notification, void *arg);
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struct v4l2_ctrl_handler *ctrl_handler;
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struct v4l2_prio_state prio;
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struct kref ref;
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void (*release)(struct v4l2_device *v4l2_dev);
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};
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/**
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* v4l2_device_get - gets a V4L2 device reference
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*
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* @v4l2_dev: pointer to struct &v4l2_device
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*
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* This is an ancillary routine meant to increment the usage for the
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* struct &v4l2_device pointed by @v4l2_dev.
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*/
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static inline void v4l2_device_get(struct v4l2_device *v4l2_dev)
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{
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kref_get(&v4l2_dev->ref);
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}
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/**
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* v4l2_device_put - puts a V4L2 device reference
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*
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* @v4l2_dev: pointer to struct &v4l2_device
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*
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* This is an ancillary routine meant to decrement the usage for the
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* struct &v4l2_device pointed by @v4l2_dev.
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*/
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int v4l2_device_put(struct v4l2_device *v4l2_dev);
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/**
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* v4l2_device_register - Initialize v4l2_dev and make @dev->driver_data
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* point to @v4l2_dev.
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*
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* @dev: pointer to struct &device
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* @v4l2_dev: pointer to struct &v4l2_device
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*
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* .. note::
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* @dev may be %NULL in rare cases (ISA devices).
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* In such case the caller must fill in the @v4l2_dev->name field
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* before calling this function.
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*/
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int __must_check v4l2_device_register(struct device *dev,
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struct v4l2_device *v4l2_dev);
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/**
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* v4l2_device_set_name - Optional function to initialize the
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* name field of struct &v4l2_device
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*
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* @v4l2_dev: pointer to struct &v4l2_device
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* @basename: base name for the device name
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* @instance: pointer to a static atomic_t var with the instance usage for
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* the device driver.
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*
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* v4l2_device_set_name() initializes the name field of struct &v4l2_device
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* using the driver name and a driver-global atomic_t instance.
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*
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* This function will increment the instance counter and returns the
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* instance value used in the name.
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*
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* Example:
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*
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* static atomic_t drv_instance = ATOMIC_INIT(0);
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*
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* ...
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*
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* instance = v4l2_device_set_name(&\ v4l2_dev, "foo", &\ drv_instance);
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*
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* The first time this is called the name field will be set to foo0 and
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* this function returns 0. If the name ends with a digit (e.g. cx18),
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* then the name will be set to cx18-0 since cx180 would look really odd.
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*/
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int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename,
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atomic_t *instance);
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/**
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* v4l2_device_disconnect - Change V4L2 device state to disconnected.
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*
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* @v4l2_dev: pointer to struct v4l2_device
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*
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* Should be called when the USB parent disconnects.
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* Since the parent disappears, this ensures that @v4l2_dev doesn't have
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* an invalid parent pointer.
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*
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* .. note:: This function sets @v4l2_dev->dev to NULL.
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*/
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void v4l2_device_disconnect(struct v4l2_device *v4l2_dev);
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/**
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* v4l2_device_unregister - Unregister all sub-devices and any other
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* resources related to @v4l2_dev.
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*
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* @v4l2_dev: pointer to struct v4l2_device
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*/
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void v4l2_device_unregister(struct v4l2_device *v4l2_dev);
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/**
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* v4l2_device_register_subdev - Registers a subdev with a v4l2 device.
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*
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* @v4l2_dev: pointer to struct &v4l2_device
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* @sd: pointer to &struct v4l2_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_device_register_subdev(struct v4l2_device *v4l2_dev,
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struct v4l2_subdev *sd);
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/**
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* v4l2_device_unregister_subdev - Unregisters a subdev with a v4l2 device.
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*
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* @sd: pointer to &struct v4l2_subdev
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*
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* .. note ::
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*
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* Can also be called if the subdev wasn't registered. In such
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* case, it will do nothing.
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*/
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void v4l2_device_unregister_subdev(struct v4l2_subdev *sd);
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/**
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* __v4l2_device_register_subdev_nodes - Registers device nodes for
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* all subdevs of the v4l2 device that are marked with the
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* %V4L2_SUBDEV_FL_HAS_DEVNODE flag.
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*
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* @v4l2_dev: pointer to struct v4l2_device
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* @read_only: subdevices read-only flag. True to register the subdevices
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* device nodes in read-only mode, false to allow full access to the
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* subdevice userspace API.
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*/
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int __must_check
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__v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev,
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bool read_only);
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/**
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* v4l2_device_register_subdev_nodes - Registers subdevices device nodes with
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* unrestricted access to the subdevice userspace operations
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*
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* Internally calls __v4l2_device_register_subdev_nodes(). See its documentation
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* for more details.
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*
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* @v4l2_dev: pointer to struct v4l2_device
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*/
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static inline int __must_check
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v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev)
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{
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#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
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return __v4l2_device_register_subdev_nodes(v4l2_dev, false);
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#else
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return 0;
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#endif
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}
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/**
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* v4l2_device_register_ro_subdev_nodes - Registers subdevices device nodes
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* in read-only mode
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*
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* Internally calls __v4l2_device_register_subdev_nodes(). See its documentation
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* for more details.
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*
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* @v4l2_dev: pointer to struct v4l2_device
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*/
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static inline int __must_check
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v4l2_device_register_ro_subdev_nodes(struct v4l2_device *v4l2_dev)
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{
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#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
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return __v4l2_device_register_subdev_nodes(v4l2_dev, true);
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#else
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return 0;
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#endif
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}
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/**
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* v4l2_subdev_notify - Sends a notification to v4l2_device.
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*
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* @sd: pointer to &struct v4l2_subdev
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* @notification: type of notification. Please notice that the notification
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* type is driver-specific.
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* @arg: arguments for the notification. Those are specific to each
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* notification type.
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*/
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static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
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unsigned int notification, void *arg)
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{
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if (sd && sd->v4l2_dev && sd->v4l2_dev->notify)
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sd->v4l2_dev->notify(sd, notification, arg);
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}
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/**
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* v4l2_device_supports_requests - Test if requests are supported.
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*
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* @v4l2_dev: pointer to struct v4l2_device
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*/
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static inline bool v4l2_device_supports_requests(struct v4l2_device *v4l2_dev)
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{
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return v4l2_dev->mdev && v4l2_dev->mdev->ops &&
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v4l2_dev->mdev->ops->req_queue;
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}
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/* Helper macros to iterate over all subdevs. */
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/**
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* v4l2_device_for_each_subdev - Helper macro that interates over all
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* sub-devices of a given &v4l2_device.
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*
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* @sd: pointer that will be filled by the macro with all
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* &struct v4l2_subdev pointer used as an iterator by the loop.
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* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
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*
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* This macro iterates over all sub-devices owned by the @v4l2_dev device.
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* It acts as a for loop iterator and executes the next statement with
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* the @sd variable pointing to each sub-device in turn.
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*/
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#define v4l2_device_for_each_subdev(sd, v4l2_dev) \
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list_for_each_entry(sd, &(v4l2_dev)->subdevs, list)
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/**
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* __v4l2_device_call_subdevs_p - Calls the specified operation for
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* all subdevs matching the condition.
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*
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* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
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* @sd: pointer that will be filled by the macro with all
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* &struct v4l2_subdev pointer used as an iterator by the loop.
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* @cond: condition to be match
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* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
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* Each element there groups a set of operations functions.
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* @f: operation function that will be called if @cond matches.
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* The operation functions are defined in groups, according to
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* each element at &struct v4l2_subdev_ops.
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* @args: arguments for @f.
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*
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* Ignore any errors.
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*
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* Note: subdevs cannot be added or deleted while walking
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* the subdevs list.
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*/
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#define __v4l2_device_call_subdevs_p(v4l2_dev, sd, cond, o, f, args...) \
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do { \
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list_for_each_entry((sd), &(v4l2_dev)->subdevs, list) \
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if ((cond) && (sd)->ops->o && (sd)->ops->o->f) \
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(sd)->ops->o->f((sd) , ##args); \
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} while (0)
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/**
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* __v4l2_device_call_subdevs - Calls the specified operation for
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* all subdevs matching the condition.
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*
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* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
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* @cond: condition to be match
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* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
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* Each element there groups a set of operations functions.
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* @f: operation function that will be called if @cond matches.
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* The operation functions are defined in groups, according to
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* each element at &struct v4l2_subdev_ops.
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* @args: arguments for @f.
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*
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* Ignore any errors.
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*
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* Note: subdevs cannot be added or deleted while walking
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* the subdevs list.
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*/
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#define __v4l2_device_call_subdevs(v4l2_dev, cond, o, f, args...) \
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do { \
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struct v4l2_subdev *__sd; \
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\
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__v4l2_device_call_subdevs_p(v4l2_dev, __sd, cond, o, \
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f , ##args); \
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} while (0)
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/**
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* __v4l2_device_call_subdevs_until_err_p - Calls the specified operation for
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* all subdevs matching the condition.
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*
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* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
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* @sd: pointer that will be filled by the macro with all
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* &struct v4l2_subdev sub-devices associated with @v4l2_dev.
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* @cond: condition to be match
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* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
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* Each element there groups a set of operations functions.
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* @f: operation function that will be called if @cond matches.
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* The operation functions are defined in groups, according to
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* each element at &struct v4l2_subdev_ops.
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* @args: arguments for @f.
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*
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* Return:
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*
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* If the operation returns an error other than 0 or ``-ENOIOCTLCMD``
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* for any subdevice, then abort and return with that error code, zero
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* otherwise.
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*
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* Note: subdevs cannot be added or deleted while walking
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* the subdevs list.
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*/
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#define __v4l2_device_call_subdevs_until_err_p(v4l2_dev, sd, cond, o, f, args...) \
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({ \
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long __err = 0; \
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\
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list_for_each_entry((sd), &(v4l2_dev)->subdevs, list) { \
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if ((cond) && (sd)->ops->o && (sd)->ops->o->f) \
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__err = (sd)->ops->o->f((sd) , ##args); \
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if (__err && __err != -ENOIOCTLCMD) \
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break; \
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} \
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(__err == -ENOIOCTLCMD) ? 0 : __err; \
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})
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/**
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* __v4l2_device_call_subdevs_until_err - Calls the specified operation for
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* all subdevs matching the condition.
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*
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* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
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* @cond: condition to be match
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* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
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* Each element there groups a set of operations functions.
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* @f: operation function that will be called if @cond matches.
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* The operation functions are defined in groups, according to
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* each element at &struct v4l2_subdev_ops.
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* @args: arguments for @f.
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*
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* Return:
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*
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* If the operation returns an error other than 0 or ``-ENOIOCTLCMD``
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* for any subdevice, then abort and return with that error code,
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* zero otherwise.
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*
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* Note: subdevs cannot be added or deleted while walking
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* the subdevs list.
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*/
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#define __v4l2_device_call_subdevs_until_err(v4l2_dev, cond, o, f, args...) \
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({ \
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struct v4l2_subdev *__sd; \
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__v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd, cond, o, \
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f , ##args); \
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})
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/**
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* v4l2_device_call_all - Calls the specified operation for
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* all subdevs matching the &v4l2_subdev.grp_id, as assigned
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* by the bridge driver.
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*
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* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
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* @grpid: &struct v4l2_subdev->grp_id group ID to match.
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* Use 0 to match them all.
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* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
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* Each element there groups a set of operations functions.
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* @f: operation function that will be called if @cond matches.
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* The operation functions are defined in groups, according to
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* each element at &struct v4l2_subdev_ops.
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* @args: arguments for @f.
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*
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* Ignore any errors.
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*
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* Note: subdevs cannot be added or deleted while walking
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* the subdevs list.
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*/
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#define v4l2_device_call_all(v4l2_dev, grpid, o, f, args...) \
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do { \
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struct v4l2_subdev *__sd; \
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\
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__v4l2_device_call_subdevs_p(v4l2_dev, __sd, \
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(grpid) == 0 || __sd->grp_id == (grpid), o, f , \
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##args); \
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} while (0)
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/**
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* v4l2_device_call_until_err - Calls the specified operation for
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* all subdevs matching the &v4l2_subdev.grp_id, as assigned
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* by the bridge driver, until an error occurs.
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*
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* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
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* @grpid: &struct v4l2_subdev->grp_id group ID to match.
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* Use 0 to match them all.
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* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
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* Each element there groups a set of operations functions.
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* @f: operation function that will be called if @cond matches.
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* The operation functions are defined in groups, according to
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* each element at &struct v4l2_subdev_ops.
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* @args: arguments for @f.
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*
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* Return:
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*
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* If the operation returns an error other than 0 or ``-ENOIOCTLCMD``
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* for any subdevice, then abort and return with that error code,
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* zero otherwise.
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*
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* Note: subdevs cannot be added or deleted while walking
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* the subdevs list.
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*/
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#define v4l2_device_call_until_err(v4l2_dev, grpid, o, f, args...) \
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({ \
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struct v4l2_subdev *__sd; \
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__v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd, \
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(grpid) == 0 || __sd->grp_id == (grpid), o, f , \
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##args); \
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})
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/**
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* v4l2_device_mask_call_all - Calls the specified operation for
|
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* all subdevices where a group ID matches a specified bitmask.
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*
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* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
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* @grpmsk: bitmask to be checked against &struct v4l2_subdev->grp_id
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* group ID to be matched. Use 0 to match them all.
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* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
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* Each element there groups a set of operations functions.
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* @f: operation function that will be called if @cond matches.
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* The operation functions are defined in groups, according to
|
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* each element at &struct v4l2_subdev_ops.
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* @args: arguments for @f.
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*
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* Ignore any errors.
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*
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* Note: subdevs cannot be added or deleted while walking
|
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* the subdevs list.
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*/
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#define v4l2_device_mask_call_all(v4l2_dev, grpmsk, o, f, args...) \
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do { \
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struct v4l2_subdev *__sd; \
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\
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__v4l2_device_call_subdevs_p(v4l2_dev, __sd, \
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(grpmsk) == 0 || (__sd->grp_id & (grpmsk)), o, \
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f , ##args); \
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} while (0)
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|
|
|
/**
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|
* v4l2_device_mask_call_until_err - Calls the specified operation for
|
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* all subdevices where a group ID matches a specified bitmask.
|
|
*
|
|
* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
|
|
* @grpmsk: bitmask to be checked against &struct v4l2_subdev->grp_id
|
|
* group ID to be matched. Use 0 to match them all.
|
|
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
|
|
* Each element there groups a set of operations functions.
|
|
* @f: operation function that will be called if @cond matches.
|
|
* The operation functions are defined in groups, according to
|
|
* each element at &struct v4l2_subdev_ops.
|
|
* @args: arguments for @f.
|
|
*
|
|
* Return:
|
|
*
|
|
* If the operation returns an error other than 0 or ``-ENOIOCTLCMD``
|
|
* for any subdevice, then abort and return with that error code,
|
|
* zero otherwise.
|
|
*
|
|
* Note: subdevs cannot be added or deleted while walking
|
|
* the subdevs list.
|
|
*/
|
|
#define v4l2_device_mask_call_until_err(v4l2_dev, grpmsk, o, f, args...) \
|
|
({ \
|
|
struct v4l2_subdev *__sd; \
|
|
__v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd, \
|
|
(grpmsk) == 0 || (__sd->grp_id & (grpmsk)), o, \
|
|
f , ##args); \
|
|
})
|
|
|
|
|
|
/**
|
|
* v4l2_device_has_op - checks if any subdev with matching grpid has a
|
|
* given ops.
|
|
*
|
|
* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
|
|
* @grpid: &struct v4l2_subdev->grp_id group ID to match.
|
|
* Use 0 to match them all.
|
|
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
|
|
* Each element there groups a set of operations functions.
|
|
* @f: operation function that will be called if @cond matches.
|
|
* The operation functions are defined in groups, according to
|
|
* each element at &struct v4l2_subdev_ops.
|
|
*/
|
|
#define v4l2_device_has_op(v4l2_dev, grpid, o, f) \
|
|
({ \
|
|
struct v4l2_subdev *__sd; \
|
|
bool __result = false; \
|
|
list_for_each_entry(__sd, &(v4l2_dev)->subdevs, list) { \
|
|
if ((grpid) && __sd->grp_id != (grpid)) \
|
|
continue; \
|
|
if (v4l2_subdev_has_op(__sd, o, f)) { \
|
|
__result = true; \
|
|
break; \
|
|
} \
|
|
} \
|
|
__result; \
|
|
})
|
|
|
|
/**
|
|
* v4l2_device_mask_has_op - checks if any subdev with matching group
|
|
* mask has a given ops.
|
|
*
|
|
* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
|
|
* @grpmsk: bitmask to be checked against &struct v4l2_subdev->grp_id
|
|
* group ID to be matched. Use 0 to match them all.
|
|
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
|
|
* Each element there groups a set of operations functions.
|
|
* @f: operation function that will be called if @cond matches.
|
|
* The operation functions are defined in groups, according to
|
|
* each element at &struct v4l2_subdev_ops.
|
|
*/
|
|
#define v4l2_device_mask_has_op(v4l2_dev, grpmsk, o, f) \
|
|
({ \
|
|
struct v4l2_subdev *__sd; \
|
|
bool __result = false; \
|
|
list_for_each_entry(__sd, &(v4l2_dev)->subdevs, list) { \
|
|
if ((grpmsk) && !(__sd->grp_id & (grpmsk))) \
|
|
continue; \
|
|
if (v4l2_subdev_has_op(__sd, o, f)) { \
|
|
__result = true; \
|
|
break; \
|
|
} \
|
|
} \
|
|
__result; \
|
|
})
|
|
|
|
#endif
|