firmware/target/arm/s5l8700/ipodnano2g/powermgmt-nano2g.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 "powermgmt.h"
  24 #include "pmu-target.h"
  25
  26 const unsigned short battery_level_dangerous[BATTERY_TYPES_COUNT] =
  27 {
  28     /* TODO: this is just an initial guess */
  29     3400
  30 };
  31
  32 const unsigned short battery_level_shutoff[BATTERY_TYPES_COUNT] =
  33 {
  34     /* TODO: this is just an initial guess */
  35     3300
  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     /* TODO: simple uncalibrated curve, linear except for first 10% */
  42     { 3300, 3390, 3480, 3570, 3660, 3750, 3840, 3930, 4020, 4110, 4200 }
  43 };
  44
  45 #if CONFIG_CHARGING
  46 /* voltages (millivolt) of 0%, 10%, ... 100% when charging enabled */
  47 const unsigned short percent_to_volt_charge[11] =
  48 {
  49     /* TODO: simple uncalibrated curve, linear except for first 10% */
  50     3300, 3390, 3480, 3570, 3660, 3750, 3840, 3930, 4020, 4110, 4200
  51 };
  52 #endif /* CONFIG_CHARGING */
  53
  54 /* ADC should read 0x3ff=6.00V */
  55 #define BATTERY_SCALE_FACTOR 6000
  56 /* full-scale ADC readout (2^10) in millivolt */
  57
  58
  59 /* Returns battery voltage from ADC [millivolts] */
  60 unsigned int battery_adc_voltage(void)
  61 {
  62     return pmu_read_battery_voltage();
  63 }
  64