firmware/target/hosted/ypr0/backlight-ypr0.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  *
   9  * Copyright (C) 2011 by Lorenzo Miori
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  17  * KIND, either express or implied.
  18  *
  19  ****************************************************************************/
  20 #include "config.h"
  21 #include "system.h"
  22 #include "backlight.h"
  23 #include "backlight-target.h"
  24 #include "lcd.h"
  25 #include "as3514.h"
  26 #include "ascodec.h"
  27 #include <fcntl.h>
  28 #include "unistd.h"
  29
  30 static bool backlight_on_status = true; /* Is on or off? */
  31
  32 /*TODO: see if LCD sleep could be implemented in a better way -> ie using a rockbox feature */
  33 /* Turn off LCD power supply */
  34 static void _backlight_lcd_sleep(void)
  35 {
  36     int fp = open("/sys/class/graphics/fb0/blank", O_RDWR);
  37     write(fp, "1", 1);
  38     close(fp);
  39 }
  40 /* Turn on LCD screen */
  41 static void _backlight_lcd_power(void)
  42 {
  43     int fp = open("/sys/class/graphics/fb0/blank", O_RDWR);
  44     write(fp, "0", 1);
  45     close(fp);
  46 }
  47
  48 bool _backlight_init(void)
  49 {
  50     /* We have nothing to do */
  51     return true;
  52 }
  53
  54 void _backlight_on(void)
  55 {
  56     if (!backlight_on_status)
  57     {
  58         /* Turn on lcd power before backlight */
  59         _backlight_lcd_power();
  60         /* Original app sets this to 0xb1 when backlight is on... */
  61         ascodec_write_pmu(AS3543_BACKLIGHT, 0x1, 0xb1);
  62     }
  63
  64     backlight_on_status = true;
  65
  66 }
  67
  68 void _backlight_off(void)
  69 {
  70     if (backlight_on_status) {
  71         /* Disabling the DCDC15 completely, keeps brightness register value */
  72         ascodec_write_pmu(AS3543_BACKLIGHT, 0x1, 0x00);
  73         /* Turn off lcd power then */
  74         _backlight_lcd_sleep();
  75     }
  76
  77     backlight_on_status = false;
  78 }
  79
  80 void _backlight_set_brightness(int brightness)
  81 {
  82     /* Just another check... */
  83     if (brightness > MAX_BRIGHTNESS_SETTING)
  84         brightness = MAX_BRIGHTNESS_SETTING;
  85     if (brightness < MIN_BRIGHTNESS_SETTING)
  86         brightness = MIN_BRIGHTNESS_SETTING;
  87     ascodec_write_pmu(AS3543_BACKLIGHT, 0x3, brightness << 3 & 0xf8);
  88 }