diff options
| -rw-r--r-- | Documentation/video4linux/v4l2-framework.txt | 16 | ||||
| -rw-r--r-- | drivers/media/video/v4l2-dev.c | 4 | ||||
| -rw-r--r-- | include/media/v4l2-dev.h | 5 |
3 files changed, 21 insertions, 4 deletions
diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt index b806edaf3e7..74d677c8b03 100644 --- a/Documentation/video4linux/v4l2-framework.txt +++ b/Documentation/video4linux/v4l2-framework.txt @@ -561,6 +561,8 @@ video_device helper functions There are a few useful helper functions: +- file/video_device private data + You can set/get driver private data in the video_device struct using: void *video_get_drvdata(struct video_device *vdev); @@ -575,8 +577,7 @@ struct video_device *video_devdata(struct file *file); returns the video_device belonging to the file struct. -The final helper function combines video_get_drvdata with -video_devdata: +The video_drvdata function combines video_get_drvdata with video_devdata: void *video_drvdata(struct file *file); @@ -584,6 +585,17 @@ You can go from a video_device struct to the v4l2_device struct using: struct v4l2_device *v4l2_dev = vdev->v4l2_dev; +- Device node name + +The video_device node kernel name can be retrieved using + +const char *video_device_node_name(struct video_device *vdev); + +The name is used as a hint by userspace tools such as udev. The function +should be used where possible instead of accessing the video_device::num and +video_device::minor fields. + + video buffer helper functions ----------------------------- diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c index 500cbe9891a..aa3e0f9aa3b 100644 --- a/drivers/media/video/v4l2-dev.c +++ b/drivers/media/video/v4l2-dev.c @@ -551,8 +551,8 @@ static int __video_register_device(struct video_device *vdev, int type, int nr, vdev->dev.release = v4l2_device_release; if (nr != -1 && nr != vdev->num && warn_if_nr_in_use) - printk(KERN_WARNING "%s: requested %s%d, got %s%d\n", - __func__, name_base, nr, name_base, vdev->num); + printk(KERN_WARNING "%s: requested %s%d, got %s\n", __func__, + name_base, nr, video_device_node_name(vdev)); /* Part 5: Activate this minor. The char device can now be used. */ mutex_lock(&videodev_lock); diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h index 73c9867d744..9135f57351f 100644 --- a/include/media/v4l2-dev.h +++ b/include/media/v4l2-dev.h @@ -141,6 +141,11 @@ static inline void *video_drvdata(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_unregistered(struct video_device *vdev) { return test_bit(V4L2_FL_UNREGISTERED, &vdev->flags); |