#include <linux/poll.h>
#include <linux/fs.h>
#include <linux/device.h>
+#include <linux/cdev.h>
#include <linux/mutex.h>
#include <linux/videodev2.h>
#define VIDEO_MAJOR 81
-/* Minor device allocation */
-#define MINOR_VFL_TYPE_GRABBER_MIN 0
-#define MINOR_VFL_TYPE_GRABBER_MAX 63
-#define MINOR_VFL_TYPE_RADIO_MIN 64
-#define MINOR_VFL_TYPE_RADIO_MAX 127
-#define MINOR_VFL_TYPE_VTX_MIN 192
-#define MINOR_VFL_TYPE_VTX_MAX 223
-#define MINOR_VFL_TYPE_VBI_MIN 224
-#define MINOR_VFL_TYPE_VBI_MAX 255
-
#define VFL_TYPE_GRABBER 0
#define VFL_TYPE_VBI 1
#define VFL_TYPE_RADIO 2
#define VFL_TYPE_VTX 3
+#define VFL_TYPE_MAX 4
struct v4l2_ioctl_callbacks;
+struct video_device;
+struct v4l2_device;
+
+/* Flag to mark the video_device struct as registered.
+ Drivers can clear this flag if they want to block all future
+ device access. It is cleared by video_unregister_device. */
+#define V4L2_FL_REGISTERED (0)
+
+struct v4l2_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 (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
+ unsigned long (*get_unmapped_area) (struct file *, unsigned long,
+ unsigned long, unsigned long, unsigned long);
+ int (*mmap) (struct file *, struct vm_area_struct *);
+ int (*open) (struct file *);
+ int (*release) (struct file *);
+};
/*
* Newer version of video_device, handled by videodev2.c
struct video_device
{
/* device ops */
- const struct file_operations *fops;
+ const struct v4l2_file_operations *fops;
/* sysfs */
struct device dev; /* v4l device */
+ struct cdev *cdev; /* character device */
+
+ /* Set either parent or v4l2_dev if your driver uses v4l2_device */
struct device *parent; /* device parent */
+ struct v4l2_device *v4l2_dev; /* v4l2_device parent */
/* device info */
char name[32];
int vfl_type;
+ /* 'minor' is set to -1 if the registration failed */
int minor;
+ u16 num;
+ /* use bitops to set/clear/test flags */
+ unsigned long flags;
/* attribute to differentiate multiple indices on one physical device */
int index;
v4l2_std_id current_norm; /* Current tvnorm */
/* callbacks */
- void (*release)(struct video_device *vfd);
+ void (*release)(struct video_device *vdev);
/* ioctl callbacks */
const struct v4l2_ioctl_ops *ioctl_ops;
/* dev to video-device */
#define to_video_device(cd) container_of(cd, struct video_device, dev)
-/* Register and unregister devices. Note that if video_register_device fails,
+/* Register video devices. Note that if video_register_device fails,
the release() callback of the video_device structure is *not* called, so
the caller is responsible for freeing any data. Usually that means that
you call video_device_release() on failure. */
-int __must_check video_register_device(struct video_device *vfd, int type, int nr);
-int __must_check video_register_device_index(struct video_device *vfd,
- int type, int nr, int index);
-void video_unregister_device(struct video_device *vfd);
+int __must_check video_register_device(struct video_device *vdev, int type, int nr);
+
+/* Same as video_register_device, but no warning is issued if the desired
+ device node number was already in use. */
+int __must_check video_register_device_no_warn(struct video_device *vdev, int type, int nr);
+
+/* Unregister video devices. Will do nothing if vdev == NULL or
+ video_is_registered() returns false. */
+void video_unregister_device(struct video_device *vdev);
/* helper functions to alloc/release struct video_device, the
latter can also be used for video_device->release(). */
struct video_device * __must_check video_device_alloc(void);
-/* this release function frees the vfd pointer */
-void video_device_release(struct video_device *vfd);
+/* this release function frees the vdev pointer */
+void video_device_release(struct video_device *vdev);
/* this release function does nothing, use when the video_device is a
static global struct. Note that having a static video_device is
a dubious construction at best. */
-void video_device_release_empty(struct video_device *vfd);
+void video_device_release_empty(struct video_device *vdev);
/* helper functions to access driver private data. */
-static inline void *video_get_drvdata(struct video_device *dev)
+static inline void *video_get_drvdata(struct video_device *vdev)
{
- return dev_get_drvdata(&dev->dev);
+ return dev_get_drvdata(&vdev->dev);
}
-static inline void video_set_drvdata(struct video_device *dev, void *data)
+static inline void video_set_drvdata(struct video_device *vdev, void *data)
{
- dev_set_drvdata(&dev->dev, data);
+ dev_set_drvdata(&vdev->dev, data);
}
struct video_device *video_devdata(struct file *file);
return video_get_drvdata(video_devdata(file));
}
+static inline const char *video_device_node_name(struct video_device *vdev)
+{
+ return dev_name(&vdev->dev);
+}
+
+static inline int video_is_registered(struct video_device *vdev)
+{
+ return test_bit(V4L2_FL_REGISTERED, &vdev->flags);
+}
+
#endif /* _V4L2_DEV_H */