firmware/target/arm/philips/sa9200/powermgmt-sa9200.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  * All files in this archive are subject to the GNU General Public License.
  14  * See the file COPYING in the source tree root for full license agreement.
  15  *
  16  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  17  * KIND, either express or implied.
  18  *
  19  ****************************************************************************/
  20
  21 #include "config.h"
  22 #include "adc.h"
  23 #include "powermgmt.h"
  24
  25 const unsigned short battery_level_dangerous[BATTERY_TYPES_COUNT] =
  26 {
  27     3400
  28 };
  29
  30 const unsigned short battery_level_shutoff[BATTERY_TYPES_COUNT] =
  31 {
  32     3300
  33 };
  34
  35 /* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
  36 const unsigned short percent_to_volt_discharge[BATTERY_TYPES_COUNT][11] =
  37 {
  38     /* Sansa Li Ion 750mAH, took from battery benchs */
  39     { 3300, 3680, 3740, 3760, 3780, 3810, 3870, 3930, 3970, 4070, 4160 },
  40 };
  41
  42 /* voltages (millivolt) of 0%, 10%, ... 100% when charging enabled */
  43 const unsigned short percent_to_volt_charge[11] =
  44 {
  45     /* Sansa Li Ion 750mAH FIXME */
  46     3300, 3680, 3740, 3760, 3780, 3810, 3870, 3930, 3970, 4070, 4160
  47 };
  48
  49 /* ADC should read 0x3ff=5.12V */
  50 #define BATTERY_SCALE_FACTOR 5125
  51 /* full-scale ADC readout (2^10) in millivolt */
  52
  53 /* Returns battery voltage from ADC [millivolts] */
  54 unsigned int battery_adc_voltage(void)
  55 {
  56     return (adc_read(ADC_UNREG_POWER) * BATTERY_SCALE_FACTOR) >> 10;
  57 }
  58