diff options
Diffstat (limited to 'Documentation/video4linux')
-rw-r--r-- | Documentation/video4linux/v4l2-controls.txt | 4 | ||||
-rw-r--r-- | Documentation/video4linux/v4l2-framework.txt | 6 | ||||
-rw-r--r-- | Documentation/video4linux/vivid.txt | 5 |
3 files changed, 11 insertions, 4 deletions
diff --git a/Documentation/video4linux/v4l2-controls.txt b/Documentation/video4linux/v4l2-controls.txt index 0f84ce8c9a7b..5517db602f37 100644 --- a/Documentation/video4linux/v4l2-controls.txt +++ b/Documentation/video4linux/v4l2-controls.txt @@ -344,7 +344,9 @@ implement g_volatile_ctrl like this: } Note that you use the 'new value' union as well in g_volatile_ctrl. In general -controls that need to implement g_volatile_ctrl are read-only controls. +controls that need to implement g_volatile_ctrl are read-only controls. If they +are not, a V4L2_EVENT_CTRL_CH_VALUE will not be generated when the control +changes. To mark a control as volatile you have to set V4L2_CTRL_FLAG_VOLATILE: diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt index f586e29ce221..59e619f9bbf5 100644 --- a/Documentation/video4linux/v4l2-framework.txt +++ b/Documentation/video4linux/v4l2-framework.txt @@ -793,8 +793,8 @@ video_register_device_no_warn() instead. Whenever a device node is created some attributes are also created for you. If you look in /sys/class/video4linux you see the devices. Go into e.g. -video0 and you will see 'name', 'debug' and 'index' attributes. The 'name' -attribute is the 'name' field of the video_device struct. The 'debug' attribute +video0 and you will see 'name', 'dev_debug' and 'index' attributes. The 'name' +attribute is the 'name' field of the video_device struct. The 'dev_debug' attribute can be used to enable core debugging. See the next section for more detailed information on this. @@ -821,7 +821,7 @@ unregister the device if the registration failed. video device debugging ---------------------- -The 'debug' attribute that is created for each video, vbi, radio or swradio +The 'dev_debug' attribute that is created for each video, vbi, radio or swradio device in /sys/class/video4linux/<devX>/ allows you to enable logging of file operations. diff --git a/Documentation/video4linux/vivid.txt b/Documentation/video4linux/vivid.txt index 6cfc8541a362..cd4b5a1ac529 100644 --- a/Documentation/video4linux/vivid.txt +++ b/Documentation/video4linux/vivid.txt @@ -912,6 +912,11 @@ looped to the video input provided that: sequence and field counting in struct v4l2_buffer on the capture side may not be 100% accurate. +- field settings V4L2_FIELD_SEQ_TB/BT are not supported. While it is possible to + implement this, it would mean a lot of work to get this right. Since these + field values are rarely used the decision was made not to implement this for + now. + - on the input side the "Standard Signal Mode" for the S-Video input or the "DV Timings Signal Mode" for the HDMI input should be configured so that a valid signal is passed to the video input. |