firmware/target/arm/s3c2440/gigabeat-fx/powermgmt-meg-fx.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Heikki Hannikainen, Uwe Freese
  11  * Revisions copyright (C) 2005 by Gerald Van Baren
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ****************************************************************************/
  22 #include "config.h"
  23 #include "system.h"
  24 #include "adc.h"
  25 #include "power.h"
  26 #include "powermgmt.h"
  27
  28 const unsigned short battery_level_dangerous[BATTERY_TYPES_COUNT] =
  29 {
  30     3450
  31 };
  32
  33 const unsigned short battery_level_shutoff[BATTERY_TYPES_COUNT] =
  34 {
  35     3400
  36 };
  37
  38 /* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
  39 const unsigned short percent_to_volt_discharge[BATTERY_TYPES_COUNT][11] =
  40 {
  41     /* Toshiba Gigabeat Li Ion 830mAH figured from discharge curve */
  42     { 3480, 3550, 3590, 3610, 3630, 3650, 3700, 3760, 3800, 3910, 3990 },
  43 };
  44
  45 /* voltages (millivolt) of 0%, 10%, ... 100% when charging enabled */
  46 const unsigned short percent_to_volt_charge[11] =
  47 {
  48     /* Toshiba Gigabeat Li Ion 830mAH */
  49     3480, 3550, 3590, 3610, 3630, 3650, 3700, 3760, 3800, 3910, 3990
  50 };
  51
  52 /* ADC[0] is (530) at discharge and 625 at full charge */
  53 #define BATTERY_SCALE_FACTOR 6605
  54 /* full-scale ADC readout (2^10) in millivolt */
  55
  56 /* Returns battery voltage from ADC [millivolts] */
  57 unsigned int battery_adc_voltage(void)
  58 {
  59     return (adc_read(ADC_UNREG_POWER) * BATTERY_SCALE_FACTOR) >> 10;
  60 }
  61
  62 unsigned int input_millivolts(void)
  63 {
  64
  65     unsigned int batt_millivolts = battery_voltage();
  66
  67     if ((power_thread_inputs & POWER_INPUT_BATTERY) == 0) {
  68         /* Just return a safe value if battery isn't connected */
  69         return 4050;
  70     }
  71
  72     return batt_millivolts;
  73 }
  74
  75