diff options
Diffstat (limited to 'include/media/v4l2-dev.h')
| -rw-r--r-- | include/media/v4l2-dev.h | 66 |
1 files changed, 50 insertions, 16 deletions
diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h index a0a6b41c5e0..e36faab8459 100644 --- a/include/media/v4l2-dev.h +++ b/include/media/v4l2-dev.h @@ -25,6 +25,25 @@ #define VFL_TYPE_MAX 4 struct v4l2_ioctl_callbacks; +struct video_device; +struct v4l2_device; + +/* Flag to mark the video_device struct as unregistered. + Drivers can set this flag if they want to block all future + device access. It is set by video_unregister_device. */ +#define V4L2_FL_UNREGISTERED (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); + 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 @@ -35,19 +54,24 @@ struct v4l2_ioctl_callbacks; 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 */ - void (*cdev_release)(struct kobject *kobj); + 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; @@ -58,7 +82,7 @@ struct video_device 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; @@ -67,36 +91,41 @@ struct video_device /* 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, + you call video_device_release() on failure. + + Also note that vdev->minor is set to -1 if the registration failed. */ +int __must_check video_register_device(struct video_device *vdev, int type, int nr); +int __must_check video_register_device_index(struct video_device *vdev, int type, int nr, int index); -void video_unregister_device(struct video_device *vfd); + +/* Unregister video devices. Will do nothing if vdev == NULL or + vdev->minor < 0. */ +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); @@ -108,4 +137,9 @@ static inline void *video_drvdata(struct file *file) return video_get_drvdata(video_devdata(file)); } +static inline int video_is_unregistered(struct video_device *vdev) +{ + return test_bit(V4L2_FL_UNREGISTERED, &vdev->flags); +} + #endif /* _V4L2_DEV_H */ |