firmware/target/arm/tms320dm320/mrobe-500/backlight-mr500.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2007 by Karl Kurbjun
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "config.h"
  23 #include "cpu.h"
  24 #include "system.h"
  25 #include "backlight-target.h"
  26 #include "backlight.h"
  27 #include "lcd.h"
  28 #include "power.h"
  29 #include "spi-target.h"
  30
  31 int _backlight_brightness=DEFAULT_BRIGHTNESS_SETTING;
  32
  33 static void _backlight_write_brightness(int brightness)
  34 {
  35     uint8_t bl_command[] = {0xa4, 0x00, brightness, 0xbb};
  36     spi_block_transfer(SPI_target_BACKLIGHT, bl_command, 4, 0, 0);
  37 }
  38
  39 void _backlight_on(void)
  40 {
  41 #ifdef HAVE_LCD_ENABLE
  42     lcd_enable(true); /* power on lcd + visible display */
  43 #endif
  44     _backlight_write_brightness(_backlight_brightness);
  45 }
  46
  47 void _backlight_off(void)
  48 {
  49     _backlight_write_brightness(0);
  50 }
  51
  52 /* Assumes that the backlight has been initialized */
  53 void _backlight_set_brightness(int brightness)
  54 {
  55     _backlight_brightness=brightness;
  56     _backlight_write_brightness(brightness);
  57 }
  58
  59 void __backlight_dim(bool dim_now)
  60 {
  61     _backlight_set_brightness(dim_now ?
  62         DEFAULT_BRIGHTNESS_SETTING :
  63         DEFAULT_DIMNESS_SETTING);
  64 }
  65
  66 bool _backlight_init(void)
  67 {
  68     _backlight_set_brightness(_backlight_brightness);
  69     return true;
  70 }