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