firmware/target/arm/as3525/powermgmt-as3525.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright © 2008 Rafaël Carré
  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 "adc.h"
  24 #include "adc-target.h"
  25 #include "powermgmt.h"
  26
  27 /* TODO
  28     Each as3525 target should probably define its own battery properties
  29     (dangerous/shutoff battery level, discharge/charge curves) in a file
  30     called powermgmt-<target>.c in its own sub-directory.
  31
  32     For now, this file provides simple uncalibrated settings to get at least
  33     a basic reading for all as3525 targets with a lithium battery.
  34  */
  35
  36 const unsigned short battery_level_dangerous[BATTERY_TYPES_COUNT] =
  37 {
  38     /* TODO: this is just an initial guess */
  39     3400
  40 };
  41
  42 const unsigned short battery_level_shutoff[BATTERY_TYPES_COUNT] =
  43 {
  44     /* TODO: this is just an initial guess */
  45     3300
  46 };
  47
  48 /* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
  49 const unsigned short percent_to_volt_discharge[BATTERY_TYPES_COUNT][11] =
  50 {
  51     /* TODO: simple uncalibrated curve, linear except for first 10% */
  52     { 3300, 3390, 3480, 3570, 3660, 3750, 3840, 3930, 4020, 4110, 4200 }
  53 };
  54
  55 #if CONFIG_CHARGING
  56 /* voltages (millivolt) of 0%, 10%, ... 100% when charging enabled */
  57 const unsigned short percent_to_volt_charge[11] =
  58 {
  59     /* TODO: simple uncalibrated curve, linear except for first 10% */
  60     3300, 3390, 3480, 3570, 3660, 3750, 3840, 3930, 4020, 4110, 4200
  61 };
  62 #endif /* CONFIG_CHARGING */
  63
  64 /* ADC should read 0x3ff=5.12V */
  65 #define BATTERY_SCALE_FACTOR 5125
  66 /* full-scale ADC readout (2^10) in millivolt */
  67
  68 /* Returns battery voltage from ADC [millivolts] */
  69 unsigned int battery_adc_voltage(void)
  70 {
  71     return (adc_read(ADC_RTCSUP) * BATTERY_SCALE_FACTOR) >> 10;
  72 }
  73