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1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * Copyright (c) 2019 Microchip Technology Inc. and its subsidiaries4 *5 * Author: Eugen Hristev <eugen.hristev@microchip.com>6 */7 8#ifndef __LINUX_ATMEL_ISC_MEDIA_H__9#define __LINUX_ATMEL_ISC_MEDIA_H__10 11/*12 * There are 8 controls available:13 * 4 gain controls, sliders, for each of the BAYER components: R, B, GR, GB.14 * These gains are multipliers for each component, in format unsigned 0:4:9 with15 * a default value of 512 (1.0 multiplier).16 * 4 offset controls, sliders, for each of the BAYER components: R, B, GR, GB.17 * These offsets are added/substracted from each component, in format signed18 * 1:12:0 with a default value of 0 (+/- 0)19 *20 * To expose this to userspace, added 8 custom controls, in an auto cluster.21 *22 * To summarize the functionality:23 * The auto cluster switch is the auto white balance control, and it works24 * like this:25 * AWB == 1: autowhitebalance is on, the do_white_balance button is inactive,26 * the gains/offsets are inactive, but volatile and readable.27 * Thus, the results of the whitebalance algorithm are available to userspace to28 * read at any time.29 * AWB == 0: autowhitebalance is off, cluster is in manual mode, user can30 * configure the gain/offsets directly.31 * More than that, if the do_white_balance button is32 * pressed, the driver will perform one-time-adjustment, (preferably with color33 * checker card) and the userspace can read again the new values.34 *35 * With this feature, the userspace can save the coefficients and reinstall them36 * for example after reboot or reprobing the driver.37 */38 39enum atmel_isc_ctrl_id {40 /* Red component gain control */41 ISC_CID_R_GAIN = (V4L2_CID_USER_ATMEL_ISC_BASE + 0),42 /* Blue component gain control */43 ISC_CID_B_GAIN,44 /* Green Red component gain control */45 ISC_CID_GR_GAIN,46 /* Green Blue gain control */47 ISC_CID_GB_GAIN,48 /* Red component offset control */49 ISC_CID_R_OFFSET,50 /* Blue component offset control */51 ISC_CID_B_OFFSET,52 /* Green Red component offset control */53 ISC_CID_GR_OFFSET,54 /* Green Blue component offset control */55 ISC_CID_GB_OFFSET,56};57 58#endif59