1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
4 * PCF50633 backlight device driver
5 */
6
7#ifndef __LINUX_MFD_PCF50633_BACKLIGHT
8#define __LINUX_MFD_PCF50633_BACKLIGHT
9
10/*
11* @default_brightness: Backlight brightness is initialized to this value
12*
13* Brightness to be used after the driver has been probed.
14* Valid range 0-63.
15*
16* @default_brightness_limit: The actual brightness is limited by this value
17*
18* Brightness limit to be used after the driver has been probed. This is useful
19* when it is not known how much power is available for the backlight during
20* probe.
21* Valid range 0-63. Can be changed later with pcf50633_bl_set_brightness_limit.
22*
23* @ramp_time: Display ramp time when changing brightness
24*
25* When changing the backlights brightness the change is not instant, instead
26* it fades smooth from one state to another. This value specifies how long
27* the fade should take. The lower the value the higher the fade time.
28* Valid range 0-255
29*/
30struct pcf50633_bl_platform_data {
31 unsigned int default_brightness;
32 unsigned int default_brightness_limit;
33 uint8_t ramp_time;
34};
35
36
37struct pcf50633;
38
39int pcf50633_bl_set_brightness_limit(struct pcf50633 *pcf, unsigned int limit);
40
41#endif
42
43

source code of linux/include/linux/mfd/pcf50633/backlight.h