1 /* SPDX-License-Identifier: GPL-2.0-only */ 1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* 2 /*
3 * Copyright (c) 2019 Microchip Technology Inc 3 * Copyright (c) 2019 Microchip Technology Inc. and its subsidiaries
4 * 4 *
5 * Author: Eugen Hristev <eugen.hristev@microc 5 * Author: Eugen Hristev <eugen.hristev@microchip.com>
6 */ 6 */
7 7
8 #ifndef __LINUX_ATMEL_ISC_MEDIA_H__ 8 #ifndef __LINUX_ATMEL_ISC_MEDIA_H__
9 #define __LINUX_ATMEL_ISC_MEDIA_H__ 9 #define __LINUX_ATMEL_ISC_MEDIA_H__
10 10
11 /* 11 /*
12 * There are 8 controls available: 12 * There are 8 controls available:
13 * 4 gain controls, sliders, for each of the B 13 * 4 gain controls, sliders, for each of the BAYER components: R, B, GR, GB.
14 * These gains are multipliers for each compon 14 * These gains are multipliers for each component, in format unsigned 0:4:9 with
15 * a default value of 512 (1.0 multiplier). 15 * a default value of 512 (1.0 multiplier).
16 * 4 offset controls, sliders, for each of the 16 * 4 offset controls, sliders, for each of the BAYER components: R, B, GR, GB.
17 * These offsets are added/substracted from ea 17 * These offsets are added/substracted from each component, in format signed
18 * 1:12:0 with a default value of 0 (+/- 0) 18 * 1:12:0 with a default value of 0 (+/- 0)
19 * 19 *
20 * To expose this to userspace, added 8 custom 20 * To expose this to userspace, added 8 custom controls, in an auto cluster.
21 * 21 *
22 * To summarize the functionality: 22 * To summarize the functionality:
23 * The auto cluster switch is the auto white b 23 * The auto cluster switch is the auto white balance control, and it works
24 * like this: 24 * like this:
25 * AWB == 1: autowhitebalance is on, the do_wh 25 * AWB == 1: autowhitebalance is on, the do_white_balance button is inactive,
26 * the gains/offsets are inactive, but volatil 26 * the gains/offsets are inactive, but volatile and readable.
27 * Thus, the results of the whitebalance algor 27 * Thus, the results of the whitebalance algorithm are available to userspace to
28 * read at any time. 28 * read at any time.
29 * AWB == 0: autowhitebalance is off, cluster 29 * AWB == 0: autowhitebalance is off, cluster is in manual mode, user can
30 * configure the gain/offsets directly. 30 * configure the gain/offsets directly.
31 * More than that, if the do_white_balance but 31 * More than that, if the do_white_balance button is
32 * pressed, the driver will perform one-time-a 32 * pressed, the driver will perform one-time-adjustment, (preferably with color
33 * checker card) and the userspace can read ag 33 * checker card) and the userspace can read again the new values.
34 * 34 *
35 * With this feature, the userspace can save t 35 * With this feature, the userspace can save the coefficients and reinstall them
36 * for example after reboot or reprobing the d 36 * for example after reboot or reprobing the driver.
37 */ 37 */
38 38
39 enum atmel_isc_ctrl_id { 39 enum atmel_isc_ctrl_id {
40 /* Red component gain control */ 40 /* Red component gain control */
41 ISC_CID_R_GAIN = (V4L2_CID_USER_ATMEL_ 41 ISC_CID_R_GAIN = (V4L2_CID_USER_ATMEL_ISC_BASE + 0),
42 /* Blue component gain control */ 42 /* Blue component gain control */
43 ISC_CID_B_GAIN, 43 ISC_CID_B_GAIN,
44 /* Green Red component gain control */ 44 /* Green Red component gain control */
45 ISC_CID_GR_GAIN, 45 ISC_CID_GR_GAIN,
46 /* Green Blue gain control */ 46 /* Green Blue gain control */
47 ISC_CID_GB_GAIN, 47 ISC_CID_GB_GAIN,
48 /* Red component offset control */ 48 /* Red component offset control */
49 ISC_CID_R_OFFSET, 49 ISC_CID_R_OFFSET,
50 /* Blue component offset control */ 50 /* Blue component offset control */
51 ISC_CID_B_OFFSET, 51 ISC_CID_B_OFFSET,
52 /* Green Red component offset control 52 /* Green Red component offset control */
53 ISC_CID_GR_OFFSET, 53 ISC_CID_GR_OFFSET,
54 /* Green Blue component offset control 54 /* Green Blue component offset control */
55 ISC_CID_GB_OFFSET, 55 ISC_CID_GB_OFFSET,
56 }; 56 };
57 57
58 #endif 58 #endif
59 59
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