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✏️ /usr/src/linux-headers-6.8.0-136/include/media/v4l2-fh.h

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * v4l2-fh.h
 *
 * V4L2 file handle. Store per file handle data for the V4L2
 * framework. Using file handles is optional for the drivers.
 *
 * Copyright (C) 2009--2010 Nokia Corporation.
 *
 * Contact: Sakari Ailus <sakari.ailus@iki.fi>
 */

#ifndef V4L2_FH_H
#define V4L2_FH_H

#include <linux/fs.h>
#include <linux/kconfig.h>
#include <linux/list.h>
#include <linux/videodev2.h>

struct video_device;
struct v4l2_ctrl_handler;

/**
 * struct v4l2_fh - Describes a V4L2 file handler
 *
 * @list: list of file handlers
 * @vdev: pointer to &struct video_device
 * @ctrl_handler: pointer to &struct v4l2_ctrl_handler
 * @prio: priority of the file handler, as defined by &enum v4l2_priority
 *
 * @wait: event' s wait queue
 * @subscribe_lock: serialise changes to the subscribed list; guarantee that
 *		    the add and del event callbacks are orderly called
 * @subscribed: list of subscribed events
 * @available: list of events waiting to be dequeued
 * @navailable: number of available events at @available list
 * @sequence: event sequence number
 *
 * @m2m_ctx: pointer to &struct v4l2_m2m_ctx
 */
struct v4l2_fh {
	struct list_head	list;
	struct video_device	*vdev;
	struct v4l2_ctrl_handler *ctrl_handler;
	enum v4l2_priority	prio;

/* Events */
	wait_queue_head_t	wait;
	struct mutex		subscribe_lock;
	struct list_head	subscribed;
	struct list_head	available;
	unsigned int		navailable;
	u32			sequence;

struct v4l2_m2m_ctx	*m2m_ctx;
};

/**
 * v4l2_fh_init - Initialise the file handle.
 *
 * @fh: pointer to &struct v4l2_fh
 * @vdev: pointer to &struct video_device
 *
 * Parts of the V4L2 framework using the
 * file handles should be initialised in this function. Must be called
 * from driver's v4l2_file_operations->open\(\) handler if the driver
 * uses &struct v4l2_fh.
 */
void v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev);

/**
 * v4l2_fh_add - Add the fh to the list of file handles on a video_device.
 *
 * @fh: pointer to &struct v4l2_fh
 *
 * .. note::
 *    The @fh file handle must be initialised first.
 */
void v4l2_fh_add(struct v4l2_fh *fh);

/**
 * v4l2_fh_open - Ancillary routine that can be used as the open\(\) op
 *	of v4l2_file_operations.
 *
 * @filp: pointer to struct file
 *
 * It allocates a v4l2_fh and inits and adds it to the &struct video_device
 * associated with the file pointer.
 */
int v4l2_fh_open(struct file *filp);

/**
 * v4l2_fh_del - Remove file handle from the list of file handles.
 *
 * @fh: pointer to &struct v4l2_fh
 *
 * On error filp->private_data will be %NULL, otherwise it will point to
 * the &struct v4l2_fh.
 *
 * .. note::
 *    Must be called in v4l2_file_operations->release\(\) handler if the driver
 *    uses &struct v4l2_fh.
 */
void v4l2_fh_del(struct v4l2_fh *fh);

/**
 * v4l2_fh_exit - Release resources related to a file handle.
 *
 * @fh: pointer to &struct v4l2_fh
 *
 * Parts of the V4L2 framework using the v4l2_fh must release their
 * resources here, too.
 *
 * .. note::
 *    Must be called in v4l2_file_operations->release\(\) handler if the
 *    driver uses &struct v4l2_fh.
 */
void v4l2_fh_exit(struct v4l2_fh *fh);

/**
 * v4l2_fh_release - Ancillary routine that can be used as the release\(\) op
 *	of v4l2_file_operations.
 *
 * @filp: pointer to struct file
 *
 * It deletes and exits the v4l2_fh associated with the file pointer and
 * frees it. It will do nothing if filp->private_data (the pointer to the
 * v4l2_fh struct) is %NULL.
 *
 * This function always returns 0.
 */
int v4l2_fh_release(struct file *filp);

/**
 * v4l2_fh_is_singular - Returns 1 if this filehandle is the only filehandle
 *	 opened for the associated video_device.
 *
 * @fh: pointer to &struct v4l2_fh
 *
 * If @fh is NULL, then it returns 0.
 */
int v4l2_fh_is_singular(struct v4l2_fh *fh);

/**
 * v4l2_fh_is_singular_file - Returns 1 if this filehandle is the only
 *	filehandle opened for the associated video_device.
 *
 * @filp: pointer to struct file
 *
 * This is a helper function variant of v4l2_fh_is_singular() with uses
 * struct file as argument.
 *
 * If filp->private_data is %NULL, then it will return 0.
 */
static inline int v4l2_fh_is_singular_file(struct file *filp)
{
	return v4l2_fh_is_singular(filp->private_data);
}

#endif /* V4L2_EVENT_H */

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📁 davinci	dir	—	22/07/26 06:42	0755	📂
📁 drv-intf	dir	—	22/07/26 06:42	0755	📂
📁 i2c	dir	—	22/07/26 06:42	0755	📂
📁 tpg	dir	—	22/07/26 06:42	0755	📂
📄 cec-notifier.h	h	5 KB	10/03/24 20:38	0644	✏️ ⬇
📄 cec-pin.h	h	2.8 KB	10/03/24 20:38	0644	✏️ ⬇
📄 cec.h	h	17.1 KB	01/07/26 19:48	0644	✏️ ⬇
📄 demux.h	h	22.7 KB	10/03/24 20:38	0644	✏️ ⬇
📄 dmxdev.h	h	5.9 KB	10/03/24 20:38	0644	✏️ ⬇
📄 dvb-usb-ids.h	h	19.5 KB	10/03/24 20:38	0644	✏️ ⬇
📄 dvb_ca_en50221.h	h	4.4 KB	10/03/24 20:38	0644	✏️ ⬇
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📄 media-dev-allocator.h	h	2.2 KB	10/03/24 20:38	0644	✏️ ⬇
📄 media-device.h	h	17.5 KB	10/03/24 20:38	0644	✏️ ⬇
📄 media-devnode.h	h	5.3 KB	10/03/24 20:38	0644	✏️ ⬇
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📄 tuner.h	h	8.4 KB	10/03/24 20:38	0644	✏️ ⬇
📄 tveeprom.h	h	3.3 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-async.h	h	11.7 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-cci.h	h	4.8 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-common.h	h	20 KB	01/07/26 19:48	0644	✏️ ⬇
📄 v4l2-ctrls.h	h	54.5 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-dev.h	h	20.1 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-device.h	h	18.5 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-dv-timings.h	h	9.3 KB	01/07/26 19:48	0644	✏️ ⬇
📄 v4l2-event.h	h	6 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-fh.h	h	4.2 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-flash-led-class.h	h	5.8 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-fwnode.h	h	15.6 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-h264.h	h	3.1 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-image-sizes.h	h	827 B	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-ioctl.h	h	33.3 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-jpeg.h	h	5.1 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-mc.h	h	7.7 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-mediabus.h	h	8.8 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-mem2mem.h	h	29.3 KB	01/07/26 19:48	0644	✏️ ⬇
📄 v4l2-rect.h	h	5.7 KB	10/03/24 20:38	0644	✏️ ⬇
📄 v4l2-subdev.h	h	71.4 KB	01/07/26 19:48	0644	✏️ ⬇
📄 v4l2-vp9.h	h	8.3 KB	10/03/24 20:38	0644	✏️ ⬇
📄 videobuf2-core.h	h	50.4 KB	01/07/26 19:48	0644	✏️ ⬇
📄 videobuf2-dma-contig.h	h	883 B	10/03/24 20:38	0644	✏️ ⬇
📄 videobuf2-dma-sg.h	h	698 B	10/03/24 20:38	0644	✏️ ⬇
📄 videobuf2-dvb.h	h	1.8 KB	10/03/24 20:38	0644	✏️ ⬇
📄 videobuf2-memops.h	h	1.1 KB	10/03/24 20:38	0644	✏️ ⬇
📄 videobuf2-v4l2.h	h	14.4 KB	10/03/24 20:38	0644	✏️ ⬇
📄 videobuf2-vmalloc.h	h	509 B	10/03/24 20:38	0644	✏️ ⬇
📄 vsp1.h	h	3.6 KB	10/03/24 20:38	0644	✏️ ⬇

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