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-rw-r--r--include/media/media-devnode.h54
1 files changed, 53 insertions, 1 deletions
diff --git a/include/media/media-devnode.h b/include/media/media-devnode.h
index 17ddae32060d..fe42f08e72bd 100644
--- a/include/media/media-devnode.h
+++ b/include/media/media-devnode.h
@@ -40,6 +40,20 @@
*/
#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 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 *);
@@ -53,7 +67,7 @@ struct media_file_operations {
/**
* struct media_devnode - Media device node
- * @fops: pointer to struct media_file_operations with media device ops
+ * @fops: pointer to struct &media_file_operations with media device ops
* @dev: struct device pointer for the media controller device
* @cdev: struct cdev pointer character device
* @parent: parent device
@@ -86,15 +100,53 @@ struct media_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: 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_devnode *mdev,
struct module *owner);
+
+/**
+ * media_devnode_unregister - unregister a media device node
+ * @mdev: the device node to unregister
+ *
+ * This unregisters the passed device. Future open calls will be met with
+ * errors.
+ *
+ * This function can safely be called if the device node has never been
+ * registered or has already been unregistered.
+ */
void media_devnode_unregister(struct media_devnode *mdev);
+/**
+ * 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.
+ *
+ * @mdev: pointer to struct &media_devnode.
+ */
static inline int media_devnode_is_registered(struct media_devnode *mdev)
{
return test_bit(MEDIA_FLAG_REGISTERED, &mdev->flags);