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-rw-r--r--Documentation/video4linux/v4l2-framework.txt9
1 files changed, 6 insertions, 3 deletions
diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index 38d054aa0e0f..3b483c1e0124 100644
--- a/Documentation/video4linux/v4l2-framework.txt
+++ b/Documentation/video4linux/v4l2-framework.txt
@@ -392,13 +392,16 @@ You should also set these fields:
392 392
393- v4l2_dev: set to the v4l2_device parent device. 393- v4l2_dev: set to the v4l2_device parent device.
394- name: set to something descriptive and unique. 394- name: set to something descriptive and unique.
395- fops: set to the file_operations struct. 395- fops: set to the v4l2_file_operations struct.
396- ioctl_ops: if you use the v4l2_ioctl_ops to simplify ioctl maintenance 396- ioctl_ops: if you use the v4l2_ioctl_ops to simplify ioctl maintenance
397 (highly recommended to use this and it might become compulsory in the 397 (highly recommended to use this and it might become compulsory in the
398 future!), then set this to your v4l2_ioctl_ops struct. 398 future!), then set this to your v4l2_ioctl_ops struct.
399 399
400If you use v4l2_ioctl_ops, then you should set .unlocked_ioctl to 400If you use v4l2_ioctl_ops, then you should set either .unlocked_ioctl or
401__video_ioctl2 or .ioctl to video_ioctl2 in your file_operations struct. 401.ioctl to video_ioctl2 in your v4l2_file_operations struct.
402
403The v4l2_file_operations struct is a subset of file_operations. The main
404difference is that the inode argument is omitted since it is never used.
402 405
403 406
404video_device registration 407video_device registration