152 lines
4.7 KiB
C
152 lines
4.7 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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* $Id$
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*
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* Copyright (C) 2011 by Amaury Pouly
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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 "adc-target.h"
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#include "system.h"
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#include "kernel.h"
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#include "powermgmt-target.h"
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#include "lradc-imx233.h"
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#include "power-imx233.h"
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/* Virtual channels */
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#define IMX233_ADC_BATTERY -1 /* Battery voltage (mV) */
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#define IMX233_ADC_DIE_TEMP -2 /* Die temperature (°C) */
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#define IMX233_ADC_VDDIO -3 /* VddIO voltage (mV) */
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#if IMX233_SUBTARGET >= 3700
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#define IMX233_ADC_VDD5V -4 /* Vdd5V voltage (mV) */
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#endif
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#ifdef IMX233_BATT_TEMP_SENSOR
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#define IMX233_ADC_BATT_TEMP -5 /* Battery temperature (°C) */
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#endif
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static const char *imx233_adc_channel_name[NUM_ADC_CHANNELS] =
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{
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[ADC_BATTERY] = "Battery(raw)",
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[ADC_DIE_TEMP] = "Die temperature(°C)",
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[ADC_VDDIO] = "VddIO(mV)",
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#if IMX233_SUBTARGET >= 3700
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[ADC_VDD5V] = "Vdd5V(mV)",
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#endif
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#ifdef IMX233_BATT_TEMP_SENSOR
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[ADC_BATT_TEMP] = "Battery temperature(raw)",
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#endif
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};
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static int imx233_adc_mapping[NUM_ADC_CHANNELS] =
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{
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[ADC_BATTERY] = IMX233_ADC_BATTERY,
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[ADC_DIE_TEMP] = IMX233_ADC_DIE_TEMP,
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[ADC_VDDIO] = IMX233_ADC_VDDIO,
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#if IMX233_SUBTARGET >= 3700
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[ADC_VDD5V] = IMX233_ADC_VDD5V,
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#endif
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#ifdef IMX233_BATT_TEMP_SENSOR
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[ADC_BATT_TEMP] = IMX233_ADC_BATT_TEMP,
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#endif
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};
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void adc_init(void)
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{
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}
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static short adc_read_physical_ex(int virt)
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{
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imx233_lradc_clear_channel(virt);
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imx233_lradc_kick_channel(virt);
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imx233_lradc_wait_channel(virt);
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return imx233_lradc_read_channel(virt);
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}
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static short adc_read_physical(int src, bool div2)
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{
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int virt = imx233_lradc_acquire_channel(src, TIMEOUT_BLOCK);
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// divide by two for wider ranger
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imx233_lradc_setup_source(virt, div2, src);
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imx233_lradc_setup_sampling(virt, false, 0);
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int val = adc_read_physical_ex(virt);
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imx233_lradc_release_channel(virt);
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return val;
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}
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static short adc_read_virtual(int c)
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{
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switch(c)
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{
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case IMX233_ADC_BATTERY:
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return imx233_lradc_read_battery_voltage();
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case IMX233_ADC_VDDIO:
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/* VddIO pin has a builtin 2:1 divide */
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return adc_read_physical(LRADC_SRC_VDDIO, true) * 2;
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#if IMX233_SUBTARGET >= 3700
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case IMX233_ADC_VDD5V:
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/* Vdd5V pin has a builtin 4:1 divide */
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return adc_read_physical(LRADC_SRC_5V, true) * 4;
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#endif
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case IMX233_ADC_DIE_TEMP:
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{
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#if IMX233_SUBTARGET >= 3700
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// don't block on second channel otherwise we might deadlock !
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int nmos_chan = imx233_lradc_acquire_channel(LRADC_SRC_NMOS_THIN, TIMEOUT_BLOCK);
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int pmos_chan = imx233_lradc_acquire_channel(LRADC_SRC_PMOS_THIN, TIMEOUT_NOBLOCK);
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int val = 0;
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if(pmos_chan >= 0)
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{
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val = imx233_lradc_sense_die_temperature(nmos_chan, pmos_chan) - 273;
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imx233_lradc_release_channel(pmos_chan);
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}
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imx233_lradc_release_channel(nmos_chan);
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#else
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int min, max, val;
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if(imx233_power_sense_die_temperature(&min, &max) < 0)
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val = -1;
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else
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val = (max + min) / 2;
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#endif
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return val;
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}
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#ifdef IMX233_BATT_TEMP_SENSOR
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case IMX233_ADC_BATT_TEMP:
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{
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int virt = imx233_lradc_acquire_channel(IMX233_BATT_TEMP_SENSOR, TIMEOUT_BLOCK);
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int val = imx233_lradc_sense_ext_temperature(virt, IMX233_BATT_TEMP_SENSOR);
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imx233_lradc_release_channel(virt);
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return val;
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}
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#endif
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default:
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return 0;
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}
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}
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unsigned short adc_read(int channel)
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{
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int c = imx233_adc_mapping[channel];
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if(c < 0)
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return adc_read_virtual(c);
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else
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return adc_read_physical(c, true);
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}
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const char *adc_name(int channel)
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{
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return imx233_adc_channel_name[channel];
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}
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