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RTL00_SDKV35a/component/common/video/v4l2/inc/media-devnode.h

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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
+
+#if 0
+#include <linux/poll.h>
+#include <linux/fs.h>
+#include <linux/device.h>
+#include <linux/cdev.h>
+#endif
+
+
+/*
+ * 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;
+#if 0	
+	ssize_t (*read) (char __user *, size_t, loff_t *);
+	ssize_t (*write) (const char __user *, size_t, loff_t *);
+	unsigned int (*poll) (struct poll_table_struct *);
+#endif
+	long (*ioctl) (unsigned int, unsigned long);
+	long (*compat_ioctl) (unsigned int, unsigned long);
+	int (*open) ();
+	int (*release) ();
+};
+
+/**
+ * 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 */
+#if 0	
+	struct device dev;		/* media device */
+	struct cdev cdev;		/* character device */
+	struct device *parent;		/* device parent */
+#endif
+	/* 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(minor) container_of(minor, struct media_devnode, dev)
+
+int media_devnode_register(struct media_devnode *mdev);
+void media_devnode_unregister(struct media_devnode *mdev);
+#if 0
+static inline struct media_devnode *media_devnode_data()
+{
+	return private_data;
+}
+#endif
+static inline int media_devnode_is_registered(struct media_devnode *mdev)
+{
+	return test_bit(MEDIA_FLAG_REGISTERED, &mdev->flags);
+}
+
+#endif /* _MEDIA_DEVNODE_H */