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/*
* Copyright (c) 2009 NVIDIA Corporation.
*
* 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 program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "nvodm_pmu_tps6586x_adc.h"
#include "nvodm_pmu_tps6586x_i2c.h"
#include "tps6586x_reg.h"
#include "nvodm_pmu_tps6586x_supply_info_table.h"
#define ADC_CONVERSION_DELAY_USEC 70
#define ADC_CONVERSION_TIMEOUT_USEC 500
#define ADC_CONVERSION_VOLTAGE_RANGE 2000
#define ADC_CONVERSION_DIVIDOR 3
#define ADC_CONVERSION_PRECISION 10
#define ADC_CONVERSION_SUB_OFFSET 2250
#define ADC_FULL_SCALE_READING_MV_BAT 4622
#define ADC_FULL_SCALE_READING_MV_TS 2600
#define ADC_CONVERSION_PREWAIT_MS 26
/* read voltage from ADC CH10(battery) */
NvBool
Tps6586xAdcVBatSenseRead(NvOdmPmuDeviceHandle hDevice, NvU32 *volt)
{
NvU32 timeout = 0;
NvU32 dataS1 = 0;
NvU32 dataH = 0;
NvU32 dataL = 0;
NV_ASSERT(hDevice);
NV_ASSERT(volt);
*volt = 0; // Default is 0mV.
// Configuring the adc conversion cycle
// ADC0_WAIT register(0x62)
// Reset all ADC engines and return them to the idle state; ADC0_RESET: 1
if(! Tps6586xI2cWrite8(hDevice, TPS6586x_R62_ADC0_WAIT, 0x80))
return NV_FALSE;
// ADC0_SET register(0x61)
// ADC0_EN: 0(Don't start conversion); Number of Readings: 16; CHANNEL: CH10(battery)
if(! Tps6586xI2cWrite8(hDevice, TPS6586x_R61_ADC0_SET, 0x19))
return NV_FALSE;
// ADC0_WAIT register(0x62)
// REF_EN: 0; AUTO_REF: 1; Wait time: 0.062ms
if(! Tps6586xI2cWrite8(hDevice, TPS6586x_R62_ADC0_WAIT, 0x21))
return NV_FALSE;
// Start conversion!!
if(! Tps6586xI2cWrite8(hDevice, TPS6586x_R61_ADC0_SET, 0x99))
return NV_FALSE;
// Wait for conversion
//NvOdmOsWaitUS(ADC_CONVERSION_DELAY_USEC);
NvOdmOsSleepMS(ADC_CONVERSION_PREWAIT_MS);
// Make sure the conversion is completed - check for ADC error.
while (1)
{
// Read ADC status register
if(! Tps6586xI2cRead8(hDevice, TPS6586x_R9A_ADC0_INT, &dataS1))
return NV_FALSE;
// Conversion is done!
if (dataS1 & 0x80)
break;
// ADC error!
if (dataS1 & 0x40)
{
NVODMPMU_PRINTF(("ADC conversion error.\n"));
return NV_FALSE;
}
NvOdmOsWaitUS(ADC_CONVERSION_DELAY_USEC);
timeout += ADC_CONVERSION_DELAY_USEC;
if (timeout >= ADC_CONVERSION_TIMEOUT_USEC)
return NV_FALSE;
}
// Read the ADC conversion Average (SUM).
if (!Tps6586xI2cRead8(hDevice, TPS6586x_R94_ADC0_SUM2, &dataH))
return NV_FALSE;
if (!Tps6586xI2cRead8(hDevice, TPS6586x_R95_ADC0_SUM1, &dataL))
return NV_FALSE;
// Get a result value with mV.
*volt = (((dataH << 8) | dataL) * ADC_FULL_SCALE_READING_MV_BAT) / 1023 / 16;
return NV_TRUE;
}
/* read voltage from ADC CH5(temperature) */
NvBool
Tps6586xAdcVBatTempRead(NvOdmPmuDeviceHandle hDevice, NvU32 *volt)
{
NvU32 timeout = 0;
NvU32 dataS1 = 0;
NvU32 dataH = 0;
NvU32 dataL = 0;
NV_ASSERT(hDevice);
NV_ASSERT(volt);
*volt = 0; // Default is 0'C.
// Configuring the adc conversion cycle
// ADC0_WAIT register(0x62)
// Reset all ADC engines and return them to the idle state; ADC0_RESET: 1
if(! Tps6586xI2cWrite8(hDevice, TPS6586x_R62_ADC0_WAIT, 0x80))
return NV_FALSE;
// ADC0_SET register(0x61)
// ADC0_EN: 0(Don't start conversion); Number of Readings: 16; CHANNEL: CH5(temperature)
if(! Tps6586xI2cWrite8(hDevice, TPS6586x_R61_ADC0_SET, 0x14))
return NV_FALSE;
// ADC0_WAIT register(0x62)
// REF_EN: 0; AUTO_REF: 1; Wait time: 0.062ms
if(! Tps6586xI2cWrite8(hDevice, TPS6586x_R62_ADC0_WAIT, 0x21))
return NV_FALSE;
// Start conversion!!
if(! Tps6586xI2cWrite8(hDevice, TPS6586x_R61_ADC0_SET, 0x94))
return NV_FALSE;
// Wait for conversion
// NvOdmOsWaitUS(ADC_CONVERSION_DELAY_USEC);
NvOdmOsSleepMS(ADC_CONVERSION_PREWAIT_MS);
// make sure the conversion is completed, or adc error.
while (1)
{
// Read ADC status register
if(! Tps6586xI2cRead8(hDevice, TPS6586x_R9A_ADC0_INT, &dataS1))
return NV_FALSE;
// Conversion is done!
if (dataS1 & 0x80)
break;
// ADC error!
if (dataS1 & 0x40)
{
NVODMPMU_PRINTF(("ADC conversion error.\n"));
return NV_FALSE;
}
NvOdmOsWaitUS(ADC_CONVERSION_DELAY_USEC);
timeout += ADC_CONVERSION_DELAY_USEC;
if (timeout >= ADC_CONVERSION_TIMEOUT_USEC)
return NV_FALSE;
}
// Read the ADC conversion Average (SUM).
if (!Tps6586xI2cRead8(hDevice, TPS6586x_R94_ADC0_SUM2, &dataH))
return NV_FALSE;
if (!Tps6586xI2cRead8(hDevice, TPS6586x_R95_ADC0_SUM1, &dataL))
return NV_FALSE;
// Get a result value with mV.
*volt = (((dataH << 8) | dataL) * ADC_FULL_SCALE_READING_MV_TS) / 1023 / 16;
return NV_TRUE;
}
/* Calculate the battery temperature */
NvU32 Tps6586xBatteryTemperature(NvU32 VBatSense, NvU32 VBatTemp)
{
return 0;
}
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