include/linux/mfd/pcf50633/backlight.h

   1 /*
   2  *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
   3  *      PCF50633 backlight device driver
   4  *
   5  *  This program is free software; you can redistribute  it and/or modify it
   6  *  under  the terms of  the GNU General  Public License as published by the
   7  *  Free Software Foundation;  either version 2 of the  License, or (at your
   8  *  option) any later version.
   9  *
  10  *  You should have received a copy of the  GNU General Public License along
  11  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  12  *  675 Mass Ave, Cambridge, MA 02139, USA.
  13  *
  14  */
  15
  16 #ifndef __LINUX_MFD_PCF50633_BACKLIGHT
  17 #define __LINUX_MFD_PCF50633_BACKLIGHT
  18
  19 /*
  20 * @default_brightness: Backlight brightness is initialized to this value
  21 *
  22 * Brightness to be used after the driver has been probed.
  23 * Valid range 0-63.
  24 *
  25 * @default_brightness_limit: The actual brightness is limited by this value
  26 *
  27 * Brightness limit to be used after the driver has been probed. This is useful
  28 * when it is not known how much power is available for the backlight during
  29 * probe.
  30 * Valid range 0-63. Can be changed later with pcf50633_bl_set_brightness_limit.
  31 *
  32 * @ramp_time: Display ramp time when changing brightness
  33 *
  34 * When changing the backlights brightness the change is not instant, instead
  35 * it fades smooth from one state to another. This value specifies how long
  36 * the fade should take. The lower the value the higher the fade time.
  37 * Valid range 0-255
  38 */
  39 struct pcf50633_bl_platform_data {
  40         unsigned int    default_brightness;
  41         unsigned int    default_brightness_limit;
  42         uint8_t         ramp_time;
  43 };
  44
  45
  46 struct pcf50633;
  47
  48 int pcf50633_bl_set_brightness_limit(struct pcf50633 *pcf, unsigned int limit);
  49
  50 #endif
  51