include/media/v4l2-dev.h

Source file repositories/reference/linux-study-clean/include/media/v4l2-dev.h

File Facts

System
Linux kernel
Corpus path
include/media/v4l2-dev.h
Extension
.h
Size
21063 bytes
Lines
666
Domain
Repository Root And Misc
Bucket
include
Inferred role
Repository Root And Misc: operation-table or driver-model contract
Status
pattern implementation candidate

Why This File Exists

Top-level or miscellaneous repository surface. Use this as map coverage unless a later manual pass promotes the file into a deeper subsystem dossier.

Dependency Surface

Detected Declarations

Annotated Snippet

*	Those operations are used to implemente the fs struct file_operations
 *	at the V4L2 drivers. The V4L2 core overrides the fs ops with some
 *	extra logic needed by the subsystem.
 */
struct v4l2_file_operations {
	struct module *owner;
	ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
	ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
	__poll_t (*poll) (struct file *, struct poll_table_struct *);
	long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
#ifdef CONFIG_COMPAT
	long (*compat_ioctl32) (struct file *, unsigned int, unsigned long);
#endif
	unsigned long (*get_unmapped_area) (struct file *, unsigned long,
				unsigned long, unsigned long, unsigned long);
	int (*mmap) (struct file *, struct vm_area_struct *);
	int (*open) (struct file *);
	int (*release) (struct file *);
};

/*
 * Newer version of video_device, handled by videodev2.c
 *	This version moves redundant code from video device code to
 *	the common handler
 */

/**
 * struct video_device - Structure used to create and manage the V4L2 device
 *	nodes.
 *
 * @entity: &struct media_entity
 * @intf_devnode: pointer to &struct media_intf_devnode
 * @pipe: &struct media_pipeline
 * @fops: pointer to &struct v4l2_file_operations for the video device
 * @device_caps: device capabilities as used in v4l2_capabilities
 * @dev: &struct device for the video device
 * @cdev: character device
 * @v4l2_dev: pointer to &struct v4l2_device parent
 * @dev_parent: pointer to &struct device parent
 * @ctrl_handler: Control handler associated with this device node.
 *	 May be NULL.
 * @queue: &struct vb2_queue associated with this device node. May be NULL.
 * @prio: pointer to &struct v4l2_prio_state with device's Priority state.
 *	 If NULL, then v4l2_dev->prio will be used.
 * @name: video device name
 * @vfl_type: V4L device type, as defined by &enum vfl_devnode_type
 * @vfl_dir: V4L receiver, transmitter or m2m
 * @minor: device node 'minor'. It is set to -1 if the registration failed
 * @num: number of the video device node
 * @flags: video device flags. Use bitops to set/clear/test flags.
 *	   Contains a set of &enum v4l2_video_device_flags.
 * @index: attribute to differentiate multiple indices on one physical device
 * @fh_lock: Lock for all v4l2_fhs
 * @fh_list: List of &struct v4l2_fh
 * @dev_debug: Internal device debug flags, not for use by drivers
 * @tvnorms: Supported tv norms
 *
 * @release: video device release() callback
 * @ioctl_ops: pointer to &struct v4l2_ioctl_ops with ioctl callbacks
 *
 * @valid_ioctls: bitmap with the valid ioctls for this device
 * @lock: pointer to &struct mutex serialization lock
 *
 * .. note::
 *	Only set @dev_parent if that can't be deduced from @v4l2_dev.
 */

struct video_device {
#if defined(CONFIG_MEDIA_CONTROLLER)
	struct media_entity entity;
	struct media_intf_devnode *intf_devnode;
	struct media_pipeline pipe;
#endif
	const struct v4l2_file_operations *fops;

	u32 device_caps;

	/* sysfs */
	struct device dev;
	struct cdev *cdev;

	struct v4l2_device *v4l2_dev;
	struct device *dev_parent;

	struct v4l2_ctrl_handler *ctrl_handler;

	struct vb2_queue *queue;

	struct v4l2_prio_state *prio;

Annotation

Implementation Notes