91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright © 2008 Rafaël Carré
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "kernel.h"
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#include "i2c-s5l8700.h"
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static struct mutex pmu_adc_mutex;
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int pmu_initialized;
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unsigned char pmu_read(int address)
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{
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unsigned char tmp;
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i2c_read(0xe6, address, 1, &tmp);
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return tmp;
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}
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void pmu_write(int address, unsigned char val)
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{
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i2c_write(0xe6, address, 1, &val);
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}
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void pmu_read_multiple(int address, int count, unsigned char* buffer)
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{
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i2c_read(0xe6, address, count, buffer);
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}
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void pmu_write_multiple(int address, int count, unsigned char* buffer)
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{
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i2c_write(0xe6, address, count, buffer);
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}
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void pmu_init(void)
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{
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if (pmu_initialized) return;
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mutex_init(&pmu_adc_mutex);
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pmu_initialized = 1;
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}
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int pmu_read_battery_voltage(void)
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{
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int data = 0;
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if (!pmu_initialized) pmu_init();
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mutex_lock(&pmu_adc_mutex);
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pmu_write(0x54, 0x05);
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while ((data & 0x80) == 0)
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{
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yield();
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data = pmu_read(0x57);
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}
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int millivolts = ((pmu_read(0x55) << 2) | (data & 3)) * 6;
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mutex_unlock(&pmu_adc_mutex);
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return millivolts;
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}
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int pmu_read_battery_current(void)
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{
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int data = 0;
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if (!pmu_initialized) pmu_init();
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mutex_lock(&pmu_adc_mutex);
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pmu_write(0x54, 0x25);
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while ((data & 0x80) == 0)
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{
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yield();
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data = pmu_read(0x57);
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}
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int milliamps = (pmu_read(0x55) << 2) | (data & 3);
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mutex_unlock(&pmu_adc_mutex);
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return milliamps;
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}
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