firmware/target/arm/pnx0101/iriver-ifp7xx/powermgmt-ifp7xx.c

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2002 by Heikki Hannikainen, Uwe Freese
 * Revisions copyright (C) 2005 by Gerald Van Baren
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#include "config.h"
#include "adc.h"
#include "powermgmt.h"

const unsigned short battery_level_dangerous[BATTERY_TYPES_COUNT] =
{
    1050, 1150
};

const unsigned short battery_level_shutoff[BATTERY_TYPES_COUNT] =
{
    1050, 1150 /* FIXME: just copied from above, was missing in powermgmt.c */
};

/* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
const unsigned short percent_to_volt_discharge[BATTERY_TYPES_COUNT][11] =
{
    /* These values are the same as for Ondio divided by 3. */
    /* May need recalibration. */
    {  930, 1080, 1140, 1180, 1210, 1250, 1280, 1320, 1360, 1420, 1580 }, /* alkaline */
    { 1030, 1180, 1210, 1230, 1240, 1250, 1260, 1270, 1280, 1290, 1350 }  /* NiMH */
};

/* TODO: only roughly correct */
#define BATTERY_SCALE_FACTOR 3072 
/* full-scale ADC readout (2^10) in millivolt */

/* Returns battery voltage from ADC [millivolts] */
unsigned int battery_adc_voltage(void)
{
    return (adc_read(ADC_UNREG_POWER) * BATTERY_SCALE_FACTOR) >> 10;
}