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* The registration code assigns minor numbers and registers the new device node/* * Media device node * * Copyright (C) 2010 Nokia Corporation * * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> * Sakari Ailus <sakari.ailus@iki.fi> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * -- * * Common functions for media-related drivers to register and unregister media * device nodes. */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. *//** * 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 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 */