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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Media device node
*
* Copyright (C) 2010 Nokia Corporation
*
* Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
* Sakari Ailus <sakari.ailus@iki.fi>
*
* --
*
* Common functions for media-related drivers to register and unregister media
* device nodes.
*/
#ifndef _MEDIA_DEVNODE_H
#define _MEDIA_DEVNODE_H
#include <linux/poll.h>
#include <linux/fs.h>
#include <linux/device.h>
#include <linux/cdev.h>
struct media_device;
/*
* Flag to mark the media_devnode struct as registered. Drivers must not touch
* this flag directly, it will be set and cleared by media_devnode_register and
* media_devnode_unregister.
*/
#define MEDIA_FLAG_REGISTERED 0
/**
* struct media_file_operations - Media device file operations
*
* @owner: should be filled with %THIS_MODULE
* @read: pointer to the function that implements read() syscall
* @write: pointer to the function that implements write() syscall
* @poll: pointer to the function that implements poll() syscall
* @ioctl: pointer to the function that implements ioctl() syscall
* @compat_ioctl: pointer to the function that will handle 32 bits userspace
* calls to the ioctl() syscall on a Kernel compiled with 64 bits.
* @open: pointer to the function that implements open() syscall
* @release: pointer to the function that will release the resources allocated
* by the @open function.
*/
struct media_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 (*ioctl) (struct file *, unsigned int, unsigned long);
long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
int (*open) (struct file *);
int (*release) (struct file *);
};
/**
* struct media_devnode - Media device node
* @media_dev: pointer to struct &media_device
* @fops: pointer to struct &media_file_operations with media device ops
* @dev: pointer to struct &device containing the media controller device
* @cdev: struct cdev pointer character device
* @parent: parent device
* @minor: device node minor number
* @flags: flags, combination of the ``MEDIA_FLAG_*`` constants
* @release: release callback called at the end of ``media_devnode_release()``
* routine at media-device.c.
*
* This structure represents a media-related device node.
*
* The @parent is a physical device. It must be set by core or device drivers
* before registering the node.
*/
struct media_devnode {
struct media_device *media_dev;
/* device ops */
const struct media_file_operations *fops;
/* sysfs */
struct device dev; /* media device */
struct cdev cdev; /* character device */
struct device *parent; /* device parent */
/* device info */
int minor;
unsigned long flags; /* Use bitops to access flags */
/* callbacks */
void (*release)(struct media_devnode *devnode);
};
/* dev to media_devnode */
#define to_media_devnode(cd) container_of(cd, struct media_devnode, dev)
/**
* media_devnode_register - register a media device node
*
* @mdev: struct media_device we want to register a device node
* @devnode: media device node structure we want to register
* @owner: should be filled with %THIS_MODULE
*
* The registration code assigns minor numbers and registers the new device node
* with the kernel. An error is returned if no free minor number can be found,
* or if the registration of the device node fails.
*
* Zero is returned on success.
*
* Note that if the media_devnode_register call fails, the release() callback of
* the media_devnode structure is *not* called, so the caller is responsible for
* freeing any data.
*/
int __must_check media_devnode_register(struct media_device *mdev,
struct media_devnode *devnode,
struct module *owner);
/**
* media_devnode_unregister_prepare - clear the media device node register bit
* @devnode: the device node to prepare for unregister
*
* This clears the passed device register bit. Future open calls will be met
* with errors. Should be called before media_devnode_unregister() to avoid
* races with unregister and device file open calls.
*
* This function can safely be called if the device node has never been
* registered or has already been unregistered.
*/
void media_devnode_unregister_prepare(struct media_devnode *devnode);
/**
* media_devnode_unregister - unregister a media device node
* @devnode: the device node to unregister
*
* This unregisters the passed device. Future open calls will be met with
* errors.
*
* Should be called after media_devnode_unregister_prepare()
*/
void media_devnode_unregister(struct media_devnode *devnode);
/**
* media_devnode_data - returns a pointer to the &media_devnode
*
* @filp: pointer to struct &file
*/
static inline struct media_devnode *media_devnode_data(struct file *filp)
{
return filp->private_data;
}
/**
* media_devnode_is_registered - returns true if &media_devnode is registered;
* false otherwise.
*
* @devnode: pointer to struct &media_devnode.
*
* Note: If mdev is NULL, it also returns false.
*/
static inline int media_devnode_is_registered(struct media_devnode *devnode)
{
if (!devnode)
return false;
return test_bit(MEDIA_FLAG_REGISTERED, &devnode->flags);
}
#endif /* _MEDIA_DEVNODE_H */
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| davinci | Folder | 0755 |
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| drv-intf | Folder | 0755 |
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| i2c | Folder | 0755 |
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| tpg | Folder | 0755 |
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| cec-notifier.h | File | 5.03 KB | 0644 |
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| cec-pin.h | File | 2.79 KB | 0644 |
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| cec.h | File | 17.87 KB | 0644 |
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| demux.h | File | 22.69 KB | 0644 |
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| dmxdev.h | File | 5.87 KB | 0644 |
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| dvb-usb-ids.h | File | 19.46 KB | 0644 |
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| dvb_ca_en50221.h | File | 4.35 KB | 0644 |
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| dvb_demux.h | File | 10.77 KB | 0644 |
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| dvb_frontend.h | File | 30.03 KB | 0644 |
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| dvb_net.h | File | 2.25 KB | 0644 |
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| dvb_ringbuffer.h | File | 8.32 KB | 0644 |
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| dvb_vb2.h | File | 7.65 KB | 0644 |
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| dvbdev.h | File | 14.43 KB | 0644 |
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| frame_vector.h | File | 1.42 KB | 0644 |
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| hevc-ctrls.h | File | 9.81 KB | 0644 |
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| imx.h | File | 190 B | 0644 |
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| jpeg.h | File | 500 B | 0644 |
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| media-dev-allocator.h | File | 2.21 KB | 0644 |
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| media-device.h | File | 17.65 KB | 0644 |
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| media-devnode.h | File | 5.29 KB | 0644 |
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| media-entity.h | File | 47.11 KB | 0644 |
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| media-request.h | File | 11.96 KB | 0644 |
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| rc-core.h | File | 12.27 KB | 0644 |
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| rc-map.h | File | 14.41 KB | 0644 |
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| rcar-fcp.h | File | 1.1 KB | 0644 |
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| tuner-types.h | File | 7.54 KB | 0644 |
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| tuner.h | File | 8.4 KB | 0644 |
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| tveeprom.h | File | 3.3 KB | 0644 |
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| v4l2-async.h | File | 11.27 KB | 0644 |
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| v4l2-common.h | File | 19.96 KB | 0644 |
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| v4l2-ctrls.h | File | 54.21 KB | 0644 |
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| v4l2-dev.h | File | 20.11 KB | 0644 |
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| v4l2-device.h | File | 18.61 KB | 0644 |
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| v4l2-dv-timings.h | File | 9.08 KB | 0644 |
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| v4l2-event.h | File | 6.01 KB | 0644 |
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| v4l2-fh.h | File | 4.22 KB | 0644 |
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| v4l2-flash-led-class.h | File | 5.75 KB | 0644 |
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| v4l2-fwnode.h | File | 18.25 KB | 0644 |
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| v4l2-h264.h | File | 2.85 KB | 0644 |
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| v4l2-image-sizes.h | File | 827 B | 0644 |
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| v4l2-ioctl.h | File | 33.52 KB | 0644 |
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| v4l2-jpeg.h | File | 5.08 KB | 0644 |
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| v4l2-mc.h | File | 7.78 KB | 0644 |
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| v4l2-mediabus.h | File | 8.65 KB | 0644 |
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| v4l2-mem2mem.h | File | 29.4 KB | 0644 |
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| v4l2-rect.h | File | 5.71 KB | 0644 |
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| v4l2-subdev.h | File | 73.22 KB | 0644 |
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| videobuf-core.h | File | 6.81 KB | 0644 |
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| videobuf-dma-contig.h | File | 909 B | 0644 |
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| videobuf-dma-sg.h | File | 2.79 KB | 0644 |
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| videobuf-vmalloc.h | File | 1.14 KB | 0644 |
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| videobuf2-core.h | File | 51.92 KB | 0644 |
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| videobuf2-dma-contig.h | File | 883 B | 0644 |
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| videobuf2-dma-sg.h | File | 698 B | 0644 |
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| videobuf2-dvb.h | File | 1.81 KB | 0644 |
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| videobuf2-memops.h | File | 1.09 KB | 0644 |
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| videobuf2-v4l2.h | File | 14.48 KB | 0644 |
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| videobuf2-vmalloc.h | File | 509 B | 0644 |
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| vsp1.h | File | 3.57 KB | 0644 |
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