544 lines
16 KiB
C
544 lines
16 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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*
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* V 4 L 2 D R I V E R H E L P E R A P I
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*
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* Moved from videodev2.h
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*
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* Some commonly needed functions for drivers (v4l2-common.o module)
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*/
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#ifndef _V4L2_DEV_H
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#define _V4L2_DEV_H
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#include <linux/poll.h>
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#include <linux/fs.h>
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#include <linux/device.h>
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#include <linux/cdev.h>
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#include <linux/mutex.h>
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#include <linux/videodev2.h>
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#include <media/media-entity.h>
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#define VIDEO_MAJOR 81
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/**
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* enum vfl_devnode_type - type of V4L2 device node
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*
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* @VFL_TYPE_VIDEO: for video input/output devices
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* @VFL_TYPE_VBI: for vertical blank data (i.e. closed captions, teletext)
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* @VFL_TYPE_RADIO: for radio tuners
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* @VFL_TYPE_SUBDEV: for V4L2 subdevices
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* @VFL_TYPE_SDR: for Software Defined Radio tuners
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* @VFL_TYPE_TOUCH: for touch sensors
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* @VFL_TYPE_MAX: number of VFL types, must always be last in the enum
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*/
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enum vfl_devnode_type {
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VFL_TYPE_VIDEO,
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VFL_TYPE_VBI,
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VFL_TYPE_RADIO,
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VFL_TYPE_SUBDEV,
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VFL_TYPE_SDR,
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VFL_TYPE_TOUCH,
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VFL_TYPE_MAX /* Shall be the last one */
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};
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/**
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* enum vfl_devnode_direction - Identifies if a &struct video_device
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* corresponds to a receiver, a transmitter or a mem-to-mem device.
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*
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* @VFL_DIR_RX: device is a receiver.
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* @VFL_DIR_TX: device is a transmitter.
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* @VFL_DIR_M2M: device is a memory to memory device.
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*
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* Note: Ignored if &enum vfl_devnode_type is %VFL_TYPE_SUBDEV.
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*/
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enum vfl_devnode_direction {
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VFL_DIR_RX,
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VFL_DIR_TX,
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VFL_DIR_M2M,
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};
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struct v4l2_ioctl_callbacks;
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struct video_device;
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struct v4l2_device;
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struct v4l2_ctrl_handler;
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/**
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* enum v4l2_video_device_flags - Flags used by &struct video_device
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*
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* @V4L2_FL_REGISTERED:
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* indicates that a &struct video_device is registered.
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* Drivers can clear this flag if they want to block all future
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* device access. It is cleared by video_unregister_device.
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* @V4L2_FL_USES_V4L2_FH:
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* indicates that file->private_data points to &struct v4l2_fh.
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* This flag is set by the core when v4l2_fh_init() is called.
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* All new drivers should use it.
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* @V4L2_FL_QUIRK_INVERTED_CROP:
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* some old M2M drivers use g/s_crop/cropcap incorrectly: crop and
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* compose are swapped. If this flag is set, then the selection
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* targets are swapped in the g/s_crop/cropcap functions in v4l2-ioctl.c.
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* This allows those drivers to correctly implement the selection API,
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* but the old crop API will still work as expected in order to preserve
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* backwards compatibility.
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* Never set this flag for new drivers.
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* @V4L2_FL_SUBDEV_RO_DEVNODE:
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* indicates that the video device node is registered in read-only mode.
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* The flag only applies to device nodes registered for sub-devices, it is
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* set by the core when the sub-devices device nodes are registered with
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* v4l2_device_register_ro_subdev_nodes() and used by the sub-device ioctl
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* handler to restrict access to some ioctl calls.
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*/
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enum v4l2_video_device_flags {
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V4L2_FL_REGISTERED = 0,
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V4L2_FL_USES_V4L2_FH = 1,
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V4L2_FL_QUIRK_INVERTED_CROP = 2,
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V4L2_FL_SUBDEV_RO_DEVNODE = 3,
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};
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/* Priority helper functions */
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/**
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* struct v4l2_prio_state - stores the priority states
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*
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* @prios: array with elements to store the array priorities
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*
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*
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* .. note::
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* The size of @prios array matches the number of priority types defined
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* by enum &v4l2_priority.
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*/
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struct v4l2_prio_state {
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atomic_t prios[4];
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};
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/**
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* v4l2_prio_init - initializes a struct v4l2_prio_state
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*
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* @global: pointer to &struct v4l2_prio_state
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*/
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void v4l2_prio_init(struct v4l2_prio_state *global);
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/**
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* v4l2_prio_change - changes the v4l2 file handler priority
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*
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* @global: pointer to the &struct v4l2_prio_state of the device node.
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* @local: pointer to the desired priority, as defined by enum &v4l2_priority
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* @new: Priority type requested, as defined by enum &v4l2_priority.
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*
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* .. note::
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* This function should be used only by the V4L2 core.
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*/
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int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
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enum v4l2_priority new);
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/**
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* v4l2_prio_open - Implements the priority logic for a file handler open
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*
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* @global: pointer to the &struct v4l2_prio_state of the device node.
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* @local: pointer to the desired priority, as defined by enum &v4l2_priority
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*
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* .. note::
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* This function should be used only by the V4L2 core.
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*/
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void v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local);
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/**
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* v4l2_prio_close - Implements the priority logic for a file handler close
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*
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* @global: pointer to the &struct v4l2_prio_state of the device node.
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* @local: priority to be released, as defined by enum &v4l2_priority
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*
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* .. note::
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* This function should be used only by the V4L2 core.
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*/
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void v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority local);
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/**
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* v4l2_prio_max - Return the maximum priority, as stored at the @global array.
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*
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* @global: pointer to the &struct v4l2_prio_state of the device node.
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*
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* .. note::
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* This function should be used only by the V4L2 core.
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*/
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enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global);
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/**
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* v4l2_prio_check - Implements the priority logic for a file handler close
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*
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* @global: pointer to the &struct v4l2_prio_state of the device node.
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* @local: desired priority, as defined by enum &v4l2_priority local
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*
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* .. note::
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* This function should be used only by the V4L2 core.
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*/
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int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority local);
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/**
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* struct v4l2_file_operations - fs operations used by a V4L2 device
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*
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* @owner: pointer to struct module
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* @read: operations needed to implement the read() syscall
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* @write: operations needed to implement the write() syscall
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* @poll: operations needed to implement the poll() syscall
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* @unlocked_ioctl: operations needed to implement the ioctl() syscall
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* @compat_ioctl32: operations needed to implement the ioctl() syscall for
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* the special case where the Kernel uses 64 bits instructions, but
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* the userspace uses 32 bits.
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* @get_unmapped_area: called by the mmap() syscall, used when %!CONFIG_MMU
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* @mmap: operations needed to implement the mmap() syscall
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* @open: operations needed to implement the open() syscall
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* @release: operations needed to implement the release() syscall
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*
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* .. note::
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*
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* Those operations are used to implemente the fs struct file_operations
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* at the V4L2 drivers. The V4L2 core overrides the fs ops with some
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* extra logic needed by the subsystem.
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*/
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struct v4l2_file_operations {
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struct module *owner;
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ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
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ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
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__poll_t (*poll) (struct file *, struct poll_table_struct *);
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long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
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#ifdef CONFIG_COMPAT
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long (*compat_ioctl32) (struct file *, unsigned int, unsigned long);
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#endif
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unsigned long (*get_unmapped_area) (struct file *, unsigned long,
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unsigned long, unsigned long, unsigned long);
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int (*mmap) (struct file *, struct vm_area_struct *);
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int (*open) (struct file *);
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int (*release) (struct file *);
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};
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/*
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* Newer version of video_device, handled by videodev2.c
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* This version moves redundant code from video device code to
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* the common handler
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*/
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/**
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* struct video_device - Structure used to create and manage the V4L2 device
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* nodes.
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*
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* @entity: &struct media_entity
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* @intf_devnode: pointer to &struct media_intf_devnode
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* @pipe: &struct media_pipeline
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* @fops: pointer to &struct v4l2_file_operations for the video device
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* @device_caps: device capabilities as used in v4l2_capabilities
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* @dev: &struct device for the video device
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* @cdev: character device
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* @v4l2_dev: pointer to &struct v4l2_device parent
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* @dev_parent: pointer to &struct device parent
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* @ctrl_handler: Control handler associated with this device node.
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* May be NULL.
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* @queue: &struct vb2_queue associated with this device node. May be NULL.
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* @prio: pointer to &struct v4l2_prio_state with device's Priority state.
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* If NULL, then v4l2_dev->prio will be used.
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* @name: video device name
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* @vfl_type: V4L device type, as defined by &enum vfl_devnode_type
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* @vfl_dir: V4L receiver, transmitter or m2m
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* @minor: device node 'minor'. It is set to -1 if the registration failed
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* @num: number of the video device node
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* @flags: video device flags. Use bitops to set/clear/test flags.
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* Contains a set of &enum v4l2_video_device_flags.
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* @index: attribute to differentiate multiple indices on one physical device
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* @fh_lock: Lock for all v4l2_fhs
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* @fh_list: List of &struct v4l2_fh
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* @dev_debug: Internal device debug flags, not for use by drivers
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* @tvnorms: Supported tv norms
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*
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* @release: video device release() callback
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* @ioctl_ops: pointer to &struct v4l2_ioctl_ops with ioctl callbacks
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*
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* @valid_ioctls: bitmap with the valid ioctls for this device
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* @lock: pointer to &struct mutex serialization lock
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*
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* .. note::
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* Only set @dev_parent if that can't be deduced from @v4l2_dev.
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*/
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struct video_device
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{
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#if defined(CONFIG_MEDIA_CONTROLLER)
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struct media_entity entity;
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struct media_intf_devnode *intf_devnode;
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struct media_pipeline pipe;
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#endif
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const struct v4l2_file_operations *fops;
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u32 device_caps;
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/* sysfs */
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struct device dev;
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struct cdev *cdev;
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struct v4l2_device *v4l2_dev;
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struct device *dev_parent;
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struct v4l2_ctrl_handler *ctrl_handler;
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struct vb2_queue *queue;
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struct v4l2_prio_state *prio;
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/* device info */
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char name[32];
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enum vfl_devnode_type vfl_type;
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enum vfl_devnode_direction vfl_dir;
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int minor;
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u16 num;
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unsigned long flags;
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int index;
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/* V4L2 file handles */
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spinlock_t fh_lock;
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struct list_head fh_list;
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int dev_debug;
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v4l2_std_id tvnorms;
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/* callbacks */
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void (*release)(struct video_device *vdev);
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const struct v4l2_ioctl_ops *ioctl_ops;
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DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE);
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struct mutex *lock;
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};
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/**
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* media_entity_to_video_device - Returns a &struct video_device from
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* the &struct media_entity embedded on it.
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*
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* @__entity: pointer to &struct media_entity
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*/
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#define media_entity_to_video_device(__entity) \
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container_of(__entity, struct video_device, entity)
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/**
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* to_video_device - Returns a &struct video_device from the
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* &struct device embedded on it.
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*
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* @cd: pointer to &struct device
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*/
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#define to_video_device(cd) container_of(cd, struct video_device, dev)
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/**
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* __video_register_device - register video4linux devices
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*
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* @vdev: struct video_device to register
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* @type: type of device to register, as defined by &enum vfl_devnode_type
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* @nr: which device node number is desired:
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* (0 == /dev/video0, 1 == /dev/video1, ..., -1 == first free)
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* @warn_if_nr_in_use: warn if the desired device node number
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* was already in use and another number was chosen instead.
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* @owner: module that owns the video device node
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*
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* The registration code assigns minor numbers and device node numbers
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* based on the requested type and registers the new device node with
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* the kernel.
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*
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* This function assumes that struct video_device was zeroed when it
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* was allocated and does not contain any stale date.
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*
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* An error is returned if no free minor or device node number could be
|
||
|
|
* found, or if the registration of the device node failed.
|
||
|
|
*
|
||
|
|
* Returns 0 on success.
|
||
|
|
*
|
||
|
|
* .. note::
|
||
|
|
*
|
||
|
|
* This function is meant to be used only inside the V4L2 core.
|
||
|
|
* Drivers should use video_register_device() or
|
||
|
|
* video_register_device_no_warn().
|
||
|
|
*/
|
||
|
|
int __must_check __video_register_device(struct video_device *vdev,
|
||
|
|
enum vfl_devnode_type type,
|
||
|
|
int nr, int warn_if_nr_in_use,
|
||
|
|
struct module *owner);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* video_register_device - register video4linux devices
|
||
|
|
*
|
||
|
|
* @vdev: struct video_device to register
|
||
|
|
* @type: type of device to register, as defined by &enum vfl_devnode_type
|
||
|
|
* @nr: which device node number is desired:
|
||
|
|
* (0 == /dev/video0, 1 == /dev/video1, ..., -1 == first free)
|
||
|
|
*
|
||
|
|
* Internally, it calls __video_register_device(). Please see its
|
||
|
|
* documentation for more details.
|
||
|
|
*
|
||
|
|
* .. note::
|
||
|
|
* if video_register_device fails, the release() callback of
|
||
|
|
* &struct video_device structure is *not* called, so the caller
|
||
|
|
* is responsible for freeing any data. Usually that means that
|
||
|
|
* you video_device_release() should be called on failure.
|
||
|
|
*/
|
||
|
|
static inline int __must_check video_register_device(struct video_device *vdev,
|
||
|
|
enum vfl_devnode_type type,
|
||
|
|
int nr)
|
||
|
|
{
|
||
|
|
return __video_register_device(vdev, type, nr, 1, vdev->fops->owner);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* video_register_device_no_warn - register video4linux devices
|
||
|
|
*
|
||
|
|
* @vdev: struct video_device to register
|
||
|
|
* @type: type of device to register, as defined by &enum vfl_devnode_type
|
||
|
|
* @nr: which device node number is desired:
|
||
|
|
* (0 == /dev/video0, 1 == /dev/video1, ..., -1 == first free)
|
||
|
|
*
|
||
|
|
* This function is identical to video_register_device() except that no
|
||
|
|
* warning is issued if the desired device node number was already in use.
|
||
|
|
*
|
||
|
|
* Internally, it calls __video_register_device(). Please see its
|
||
|
|
* documentation for more details.
|
||
|
|
*
|
||
|
|
* .. note::
|
||
|
|
* if video_register_device fails, the release() callback of
|
||
|
|
* &struct video_device structure is *not* called, so the caller
|
||
|
|
* is responsible for freeing any data. Usually that means that
|
||
|
|
* you video_device_release() should be called on failure.
|
||
|
|
*/
|
||
|
|
static inline int __must_check
|
||
|
|
video_register_device_no_warn(struct video_device *vdev,
|
||
|
|
enum vfl_devnode_type type, int nr)
|
||
|
|
{
|
||
|
|
return __video_register_device(vdev, type, nr, 0, vdev->fops->owner);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* video_unregister_device - Unregister video devices.
|
||
|
|
*
|
||
|
|
* @vdev: &struct video_device to register
|
||
|
|
*
|
||
|
|
* Does nothing if vdev == NULL or if video_is_registered() returns false.
|
||
|
|
*/
|
||
|
|
void video_unregister_device(struct video_device *vdev);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* video_device_alloc - helper function to alloc &struct video_device
|
||
|
|
*
|
||
|
|
* Returns NULL if %-ENOMEM or a &struct video_device on success.
|
||
|
|
*/
|
||
|
|
struct video_device * __must_check video_device_alloc(void);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* video_device_release - helper function to release &struct video_device
|
||
|
|
*
|
||
|
|
* @vdev: pointer to &struct video_device
|
||
|
|
*
|
||
|
|
* Can also be used for video_device->release\(\).
|
||
|
|
*/
|
||
|
|
void video_device_release(struct video_device *vdev);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* video_device_release_empty - helper function to implement the
|
||
|
|
* video_device->release\(\) callback.
|
||
|
|
*
|
||
|
|
* @vdev: pointer to &struct video_device
|
||
|
|
*
|
||
|
|
* This release function does nothing.
|
||
|
|
*
|
||
|
|
* It should be used when the video_device is a static global struct.
|
||
|
|
*
|
||
|
|
* .. note::
|
||
|
|
* Having a static video_device is a dubious construction at best.
|
||
|
|
*/
|
||
|
|
void video_device_release_empty(struct video_device *vdev);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* v4l2_disable_ioctl- mark that a given command isn't implemented.
|
||
|
|
* shouldn't use core locking
|
||
|
|
*
|
||
|
|
* @vdev: pointer to &struct video_device
|
||
|
|
* @cmd: ioctl command
|
||
|
|
*
|
||
|
|
* This function allows drivers to provide just one v4l2_ioctl_ops struct, but
|
||
|
|
* disable ioctls based on the specific card that is actually found.
|
||
|
|
*
|
||
|
|
* .. note::
|
||
|
|
*
|
||
|
|
* This must be called before video_register_device.
|
||
|
|
* See also the comments for determine_valid_ioctls().
|
||
|
|
*/
|
||
|
|
static inline void v4l2_disable_ioctl(struct video_device *vdev,
|
||
|
|
unsigned int cmd)
|
||
|
|
{
|
||
|
|
if (_IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
|
||
|
|
set_bit(_IOC_NR(cmd), vdev->valid_ioctls);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* video_get_drvdata - gets private data from &struct video_device.
|
||
|
|
*
|
||
|
|
* @vdev: pointer to &struct video_device
|
||
|
|
*
|
||
|
|
* returns a pointer to the private data
|
||
|
|
*/
|
||
|
|
static inline void *video_get_drvdata(struct video_device *vdev)
|
||
|
|
{
|
||
|
|
return dev_get_drvdata(&vdev->dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* video_set_drvdata - sets private data from &struct video_device.
|
||
|
|
*
|
||
|
|
* @vdev: pointer to &struct video_device
|
||
|
|
* @data: private data pointer
|
||
|
|
*/
|
||
|
|
static inline void video_set_drvdata(struct video_device *vdev, void *data)
|
||
|
|
{
|
||
|
|
dev_set_drvdata(&vdev->dev, data);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* video_devdata - gets &struct video_device from struct file.
|
||
|
|
*
|
||
|
|
* @file: pointer to struct file
|
||
|
|
*/
|
||
|
|
struct video_device *video_devdata(struct file *file);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* video_drvdata - gets private data from &struct video_device using the
|
||
|
|
* struct file.
|
||
|
|
*
|
||
|
|
* @file: pointer to struct file
|
||
|
|
*
|
||
|
|
* This is function combines both video_get_drvdata() and video_devdata()
|
||
|
|
* as this is used very often.
|
||
|
|
*/
|
||
|
|
static inline void *video_drvdata(struct file *file)
|
||
|
|
{
|
||
|
|
return video_get_drvdata(video_devdata(file));
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* video_device_node_name - returns the video device name
|
||
|
|
*
|
||
|
|
* @vdev: pointer to &struct video_device
|
||
|
|
*
|
||
|
|
* Returns the device name string
|
||
|
|
*/
|
||
|
|
static inline const char *video_device_node_name(struct video_device *vdev)
|
||
|
|
{
|
||
|
|
return dev_name(&vdev->dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* video_is_registered - returns true if the &struct video_device is registered.
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* @vdev: pointer to &struct video_device
|
||
|
|
*/
|
||
|
|
static inline int video_is_registered(struct video_device *vdev)
|
||
|
|
{
|
||
|
|
return test_bit(V4L2_FL_REGISTERED, &vdev->flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* _V4L2_DEV_H */
|