xref: /openbmc/linux/include/linux/mfd/pcf50633/backlight.h (revision a912e80b)

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
 *      PCF50633 backlight device driver
 */

#ifndef __LINUX_MFD_PCF50633_BACKLIGHT
#define __LINUX_MFD_PCF50633_BACKLIGHT

/*
* @default_brightness: Backlight brightness is initialized to this value
*
* Brightness to be used after the driver has been probed.
* Valid range 0-63.
*
* @default_brightness_limit: The actual brightness is limited by this value
*
* Brightness limit to be used after the driver has been probed. This is useful
* when it is not known how much power is available for the backlight during
* probe.
* Valid range 0-63. Can be changed later with pcf50633_bl_set_brightness_limit.
*
* @ramp_time: Display ramp time when changing brightness
*
* When changing the backlights brightness the change is not instant, instead
* it fades smooth from one state to another. This value specifies how long
* the fade should take. The lower the value the higher the fade time.
* Valid range 0-255
*/
struct pcf50633_bl_platform_data {
	unsigned int	default_brightness;
	unsigned int	default_brightness_limit;
	uint8_t		ramp_time;
};


struct pcf50633;

int pcf50633_bl_set_brightness_limit(struct pcf50633 *pcf, unsigned int limit);

#endif