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9e2c85e076
This is part of the preparation to add support for iPod Nano 3G and Nano 4G. There are some optimisations left, like merging similar blocks of registers that share the same layout, but the base address have changed between SoC generations. Change-Id: I4f06727b4061977141b65d39ae19591bd5b29680
117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
/***************************************************************************
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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: adc-s5l8700.c 21775 2009-07-11 14:12:02Z bertrik $
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*
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* Copyright (C) 2009 by Bertrik Sikken
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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 "inttypes.h"
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#include "s5l87xx.h"
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#include "adc.h"
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#include "adc-target.h"
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#include "pmu-target.h"
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#include "kernel.h"
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/* MS_TO_TICKS converts a milisecond time period into the
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* corresponding amount of ticks. If the time period cannot
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* be accurately measured in ticks it will round up.
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*/
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#define MS_PER_HZ (1000/HZ)
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#define MS_TO_TICKS(x) (((x)+MS_PER_HZ-1)/MS_PER_HZ)
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static const struct pmu_adc_channel adc_channels[] =
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{
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[ADC_BATTERY] =
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{
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.name = "Battery",
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.adcc1 = PCF5063X_ADCC1_MUX_BATSNS_SUBTR
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| PCF5063X_ADCC1_AVERAGE_4
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| PCF5063X_ADCC1_RES_10BIT,
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},
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[ADC_USBDATA] =
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{
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.name = "USB D+/D-",
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.adcc1 = PCF5063X_ADCC1_MUX_ADCIN2_RES
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| PCF5063X_ADCC1_AVERAGE_16
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| PCF5063X_ADCC1_RES_10BIT,
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.adcc3 = PCF5063X_ADCC3_RES_DIV_THREE,
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},
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[ADC_ACCESSORY] =
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{
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.name = "Accessory",
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.adcc1 = PCF5063X_ADCC1_MUX_ADCIN1
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| PCF5063X_ADCC1_AVERAGE_16
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| PCF5063X_ADCC1_RES_10BIT,
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.adcc2 = PCF5063X_ADCC2_RATIO_ADCIN1
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| PCF5063X_ADCC2_RATIOSETTL_10US,
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.adcc3 = PCF5063X_ADCC3_ACCSW_EN,
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.bias_dly = MS_TO_TICKS(50),
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},
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};
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const char *adc_name(int channel)
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{
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return adc_channels[channel].name;
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}
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unsigned short adc_read_millivolts(int channel)
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{
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const struct pmu_adc_channel *ch = &adc_channels[channel];
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return pmu_adc_raw2mv(ch, pmu_read_adc(ch));
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}
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/* Returns battery voltage [millivolts] */
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unsigned int adc_read_battery_voltage(void)
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{
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return adc_read_millivolts(ADC_BATTERY);
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}
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/* Returns USB D+/D- voltage from ADC [millivolts] */
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unsigned int adc_read_usbdata_voltage(bool dp)
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{
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unsigned int mvolts;
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int gpio = dp ? 0xb0300 : 0xb0200; /* select D+/D- */
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GPIOCMD = gpio | 0xf; /* route to ADCIN2 */
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mvolts = adc_read_millivolts(ADC_USBDATA);
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GPIOCMD = gpio | 0xe; /* unroute */
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return mvolts;
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}
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/* Returns resistor connected to "Accessory identify" pin [ohms] */
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#define IAP_DEVICE_RESISTOR 100000 /* ohms */
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int adc_read_accessory_resistor(void)
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{
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int raw = pmu_read_adc(&adc_channels[ADC_ACCESSORY]);
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return (1023-raw) ? raw * IAP_DEVICE_RESISTOR / (1023-raw)
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: -1 /* open circuit */;
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}
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/* API functions */
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unsigned short adc_read(int channel)
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{
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return pmu_read_adc(&adc_channels[channel]);
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}
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void adc_init(void)
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{
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}
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