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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /include/media/media-devnode.h
Initial import
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+/*
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * --
+ *
+ * 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>
+
+/*
+ * 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 {
+ 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 *);
+ unsigned int (*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
+ * @parent: parent device
+ * @minor: device node minor number
+ * @flags: flags, combination of the MEDIA_FLAG_* constants
+ *
+ * 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 {
+ /* 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 *mdev);
+};
+
+/* dev to media_devnode */
+#define to_media_devnode(cd) container_of(cd, struct media_devnode, dev)
+
+int __must_check media_devnode_register(struct media_devnode *mdev,
+ struct module *owner);
+void media_devnode_unregister(struct media_devnode *mdev);
+
+static inline struct media_devnode *media_devnode_data(struct file *filp)
+{
+ return filp->private_data;
+}
+
+static inline int media_devnode_is_registered(struct media_devnode *mdev)
+{
+ return test_bit(MEDIA_FLAG_REGISTERED, &mdev->flags);
+}
+
+#endif /* _MEDIA_DEVNODE_H */