mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 00:40:03 +00:00
59 lines
2.1 KiB
C
59 lines
2.1 KiB
C
![]() |
/* SPDX-License-Identifier: GPL-2.0-only */
|
||
|
/*
|
||
|
* Copyright (c) 2019 Microchip Technology Inc. and its subsidiaries
|
||
|
*
|
||
|
* Author: Eugen Hristev <eugen.hristev@microchip.com>
|
||
|
*/
|
||
|
|
||
|
#ifndef __LINUX_ATMEL_ISC_MEDIA_H__
|
||
|
#define __LINUX_ATMEL_ISC_MEDIA_H__
|
||
|
|
||
|
/*
|
||
|
* There are 8 controls available:
|
||
|
* 4 gain controls, sliders, for each of the BAYER components: R, B, GR, GB.
|
||
|
* These gains are multipliers for each component, in format unsigned 0:4:9 with
|
||
|
* a default value of 512 (1.0 multiplier).
|
||
|
* 4 offset controls, sliders, for each of the BAYER components: R, B, GR, GB.
|
||
|
* These offsets are added/substracted from each component, in format signed
|
||
|
* 1:12:0 with a default value of 0 (+/- 0)
|
||
|
*
|
||
|
* To expose this to userspace, added 8 custom controls, in an auto cluster.
|
||
|
*
|
||
|
* To summarize the functionality:
|
||
|
* The auto cluster switch is the auto white balance control, and it works
|
||
|
* like this:
|
||
|
* AWB == 1: autowhitebalance is on, the do_white_balance button is inactive,
|
||
|
* the gains/offsets are inactive, but volatile and readable.
|
||
|
* Thus, the results of the whitebalance algorithm are available to userspace to
|
||
|
* read at any time.
|
||
|
* AWB == 0: autowhitebalance is off, cluster is in manual mode, user can
|
||
|
* configure the gain/offsets directly.
|
||
|
* More than that, if the do_white_balance button is
|
||
|
* pressed, the driver will perform one-time-adjustment, (preferably with color
|
||
|
* checker card) and the userspace can read again the new values.
|
||
|
*
|
||
|
* With this feature, the userspace can save the coefficients and reinstall them
|
||
|
* for example after reboot or reprobing the driver.
|
||
|
*/
|
||
|
|
||
|
enum atmel_isc_ctrl_id {
|
||
|
/* Red component gain control */
|
||
|
ISC_CID_R_GAIN = (V4L2_CID_USER_ATMEL_ISC_BASE + 0),
|
||
|
/* Blue component gain control */
|
||
|
ISC_CID_B_GAIN,
|
||
|
/* Green Red component gain control */
|
||
|
ISC_CID_GR_GAIN,
|
||
|
/* Green Blue gain control */
|
||
|
ISC_CID_GB_GAIN,
|
||
|
/* Red component offset control */
|
||
|
ISC_CID_R_OFFSET,
|
||
|
/* Blue component offset control */
|
||
|
ISC_CID_B_OFFSET,
|
||
|
/* Green Red component offset control */
|
||
|
ISC_CID_GR_OFFSET,
|
||
|
/* Green Blue component offset control */
|
||
|
ISC_CID_GB_OFFSET,
|
||
|
};
|
||
|
|
||
|
#endif
|