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Diffstat (limited to '')
| -rw-r--r-- | Documentation/driver-api/media/v4l2-controls.rst (renamed from Documentation/media/kapi/v4l2-controls.rst) | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/Documentation/media/kapi/v4l2-controls.rst b/Documentation/driver-api/media/v4l2-controls.rst index b20800cae3f2..b2e91804829b 100644 --- a/Documentation/media/kapi/v4l2-controls.rst +++ b/Documentation/driver-api/media/v4l2-controls.rst @@ -27,7 +27,7 @@ V4L2 specification with respect to controls in a central place. And to make life as easy as possible for the driver developer. Note that the control framework relies on the presence of a struct -:c:type:`v4l2_device` for V4L2 drivers and struct :c:type:`v4l2_subdev` for +:c:type:`v4l2_device` for V4L2 drivers and struct v4l2_subdev for sub-device drivers. @@ -291,8 +291,8 @@ and QUERYMENU. And G/S_CTRL as well as G/TRY/S_EXT_CTRLS are automatically suppo In practice the basic usage as described above is sufficient for most drivers. -Inheriting Controls -------------------- +Inheriting Sub-device Controls +------------------------------ When a sub-device is registered with a V4L2 driver by calling v4l2_device_register_subdev() and the ctrl_handler fields of both v4l2_subdev @@ -335,7 +335,7 @@ current and new values: union v4l2_ctrl_ptr p_new; union v4l2_ctrl_ptr p_cur; -If the control has a simple s32 type type, then: +If the control has a simple s32 type, then: .. code-block:: c @@ -349,7 +349,7 @@ Within the control ops you can freely use these. The val and cur.val speak for themselves. The p_char pointers point to character buffers of length ctrl->maximum + 1, and are always 0-terminated. -Unless the control is marked volatile the p_cur field points to the the +Unless the control is marked volatile the p_cur field points to the current cached control value. When you create a new control this value is made identical to the default value. After calling v4l2_ctrl_handler_setup() this value is passed to the hardware. It is generally a good idea to call this @@ -757,8 +757,8 @@ attempting to find another control from the same handler will deadlock. It is recommended not to use this function from inside the control ops. -Inheriting Controls -------------------- +Preventing Controls inheritance +------------------------------- When one control handler is added to another using v4l2_ctrl_add_handler, then by default all controls from one are merged to the other. But a subdev might |