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[media] v4l2-ctrl: Add helper function for the controls range update

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This patch adds a helper function that allows to modify range,
i.e. minimum, maximum, step and default value of a v4l2 control,
after the control has been created and initialized. This is helpful
in situations when range of a control depends on user configurable
parameters, e.g. camera sensor absolute exposure time depending on
an output image resolution and frame rate.
v4l2_ctrl_modify_range() function allows to modify range of an
INTEGER, BOOL, MENU, INTEGER_MENU and BITMASK type controls.
Based on a patch from Hans Verkuil http://patchwork.linuxtv.org/patch/8654.

Signed-off-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sylwester Nawrocki
2013-01-19 15:51:55 -03:00
committed by Mauro Carvalho Chehab
parent af9bb33aa3
commit 2ccbe779bc
6 changed files with 138 additions and 40 deletions
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20
include/media/v4l2-ctrls.h
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@@ -518,6 +518,26 @@ void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active);
*/
void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed);
/** v4l2_ctrl_modify_range() - Update the range of a control.
* @ctrl: The control to update.
* @min: The control's minimum value.
* @max: The control's maximum value.
* @step: The control's step value
* @def: The control's default value.
*
* Update the range of a control on the fly. This works for control types
* INTEGER, BOOLEAN, MENU, INTEGER MENU and BITMASK. For menu controls the
* @step value is interpreted as a menu_skip_mask.
*
* An error is returned if one of the range arguments is invalid for this
* control type.
*
* This function assumes that the control handler is not locked and will
* take the lock itself.
*/
int v4l2_ctrl_modify_range(struct v4l2_ctrl *ctrl,
s32 min, s32 max, u32 step, s32 def);
/** v4l2_ctrl_lock() - Helper function to lock the handler
* associated with the control.
* @ctrl: The control to lock.