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/* 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