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 */
30 struct pcf50633_bl_platform_data {
31 unsigned int default_brightness;
32 unsigned int default_brightness_limit;
33 uint8_t ramp_time;
34 };
35
36
37 struct pcf50633;
38
39 int pcf50633_bl_set_brightness_limit(struct pcf50633 *pcf, unsigned int limit);
40
41 #endif
42