firmware/target/arm/samsung/yh925/powermgmt-yh925.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
  23 #include "config.h"
  24 #include "adc.h"
  25 #include "powermgmt.h"
  26
  27 /* TODO: Not yet calibrated */
  28
  29 const unsigned short battery_level_dangerous[BATTERY_TYPES_COUNT] =
  30 {
  31     3750
  32 };
  33
  34 const unsigned short battery_level_shutoff[BATTERY_TYPES_COUNT] =
  35 {
  36     3700
  37 };
  38
  39 /* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
  40 const unsigned short percent_to_volt_discharge[BATTERY_TYPES_COUNT][11] =
  41 {
  42     { 3700, 3822, 3880, 3909, 3946, 3976, 4024, 4086, 4141, 4223, 4307 }
  43 };
  44
  45 /* voltages (millivolt) of 0%, 10%, ... 100% when charging enabled */
  46 const unsigned short percent_to_volt_charge[11] =
  47 {
  48     3868, 3971, 3988, 3998, 4018, 4036, 4097, 4116, 4165, 4222, 4307
  49 };
  50
  51 #define BATTERY_SCALE_FACTOR 4650
  52 /* full-scale ADC readout (2^10) in millivolt */
  53
  54 /* Returns battery voltage from ADC [millivolts] */
  55 unsigned int battery_adc_voltage(void)
  56 {
  57     return (adc_read(ADC_UNREG_POWER) * BATTERY_SCALE_FACTOR) >> 10;
  58 }