diff options
Diffstat (limited to 'Documentation/video4linux/v4l2-controls.txt')
| -rw-r--r-- | Documentation/video4linux/v4l2-controls.txt | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/Documentation/video4linux/v4l2-controls.txt b/Documentation/video4linux/v4l2-controls.txt index 9346fc8..f92ee30 100644 --- a/Documentation/video4linux/v4l2-controls.txt +++ b/Documentation/video4linux/v4l2-controls.txt @@ -285,11 +285,11 @@ 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. -To mark a control as volatile you have to set the is_volatile flag: +To mark a control as volatile you have to set V4L2_CTRL_FLAG_VOLATILE: ctrl = v4l2_ctrl_new_std(&sd->ctrl_handler, ...); if (ctrl) - ctrl->is_volatile = 1; + ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE; For try/s_ctrl the new values (i.e. as passed by the user) are filled in and you can modify them in try_ctrl or set them in s_ctrl. The 'cur' union @@ -367,8 +367,7 @@ Driver specific controls can be created using v4l2_ctrl_new_custom(): The last argument is the priv pointer which can be set to driver-specific private data. -The v4l2_ctrl_config struct also has fields to set the is_private and is_volatile -flags. +The v4l2_ctrl_config struct also has a field to set the is_private flag. If the name field is not set, then the framework will assume this is a standard control and will fill in the name, type and flags fields accordingly. @@ -506,8 +505,8 @@ operation should return the value that the hardware's automatic mode set up automatically. If the cluster is put in manual mode, then the manual controls should become -active again and the is_volatile flag should be ignored (so g_volatile_ctrl is -no longer called while in manual mode). +active again and V4L2_CTRL_FLAG_VOLATILE should be ignored (so g_volatile_ctrl +is no longer called while in manual mode). Finally the V4L2_CTRL_FLAG_UPDATE should be set for the auto control since changing that control affects the control flags of the manual controls. @@ -520,7 +519,7 @@ void v4l2_ctrl_auto_cluster(unsigned ncontrols, struct v4l2_ctrl **controls, The first two arguments are identical to v4l2_ctrl_cluster. The third argument tells the framework which value switches the cluster into manual mode. The -last argument will optionally set the is_volatile flag for the non-auto controls. +last argument will optionally set V4L2_CTRL_FLAG_VOLATILE for the non-auto controls. The first control of the cluster is assumed to be the 'auto' control. |