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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 "pcf50626_adc.h"
#include "pcf50626_i2c.h"
#include "pcf50626_reg.h"
//#include "pcf50626_supply_info.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
static NvBool
Pcf50626AdcIn1Read(NvOdmPmuDeviceHandle hDevice, NvU32 *volt);
static NvBool
Pcf50626AdcIn2Read(NvOdmPmuDeviceHandle hDevice, NvU32 *volt);
/* read voltage from VBATSENSE */
NvBool
Pcf50626AdcVBatSenseRead(NvOdmPmuDeviceHandle hDevice, NvU32 *volt)
{
return Pcf50626AdcIn1Read(hDevice, volt);
}
static NvBool
Pcf50626AdcIn1Read(NvOdmPmuDeviceHandle hDevice, NvU32 *volt)
{
NvU32 timeout = 0;
NvU8 dataS1 = 0;
NvU8 dataS3 = 0;
NV_ASSERT(hDevice);
NV_ASSERT(volt);
// Turn off GPIO7
if(! Pcf50626I2cWrite8(hDevice, PCF50626_GPIO7C1_ADDR, 0x0))
return NV_FALSE;
//ADCC3 - Division sel
if(! Pcf50626I2cWrite8(hDevice, PCF50626_ADCC3_ADDR, PCF50626_ADCC3_RESET))
return NV_FALSE;
//ADCC1 - Resolustion, Mux Sel, Avg sel
if(! Pcf50626I2cWrite8(hDevice, PCF50626_ADCC1_ADDR, 0x0C))
return NV_FALSE;
// Start Converstion
if(! Pcf50626I2cWrite8(hDevice, PCF50626_ADCC1_ADDR, 0x0D))
return NV_FALSE;
// Wait for conversion
NvOdmOsWaitUS(ADC_CONVERSION_DELAY_USEC);
// make sure the conversion is completed, or timeout.
while (timeout < ADC_CONVERSION_TIMEOUT_USEC)
{
if(! Pcf50626I2cRead8(hDevice, PCF50626_ADCS3_ADDR, &dataS3))
return NV_FALSE;
if (dataS3 & 0x80)
break;
NvOdmOsWaitUS(ADC_CONVERSION_DELAY_USEC);
timeout += ADC_CONVERSION_DELAY_USEC;
}
if (timeout >= ADC_CONVERSION_TIMEOUT_USEC)
{
NVODMPMU_PRINTF(("ADC conversion timeout.\n"));
return NV_FALSE;
}
// read the conversion result
if (!Pcf50626I2cRead8(hDevice, PCF50626_ADCS1_ADDR, &dataS1))
return NV_FALSE;
// Get result
*volt = (((NvU32)((dataS1 << 2) | (dataS3 & 0x03))) *
ADC_CONVERSION_VOLTAGE_RANGE * ADC_CONVERSION_DIVIDOR)
>> ADC_CONVERSION_PRECISION;
return NV_TRUE;
}
/* read bat temperature voltage from ADC2 */
NvBool
Pcf50626AdcVBatTempRead(NvOdmPmuDeviceHandle hDevice, NvU32 *volt)
{
return Pcf50626AdcIn2Read(hDevice, volt);
}
static NvBool
Pcf50626AdcIn2Read(NvOdmPmuDeviceHandle hDevice, NvU32 *volt)
{
NvU32 timeout = 0;
NvU8 dataS1 = 0;
NvU8 dataS3 = 0;
NV_ASSERT(hDevice);
NV_ASSERT(volt);
// Turn off GPIO7
if(! Pcf50626I2cWrite8(hDevice, PCF50626_GPIO7C1_ADDR, 0x0))
return NV_FALSE;
//ADCC3 - Division sel
if(! Pcf50626I2cWrite8(hDevice, PCF50626_ADCC3_ADDR, PCF50626_ADCC3_RESET))
return NV_FALSE;
//ADCC1 - Resolustion, Mux Sel, Avg sel
if(! Pcf50626I2cWrite8(hDevice, PCF50626_ADCC1_ADDR, 0x2C))
return NV_FALSE;
// Start Converstion
if(! Pcf50626I2cWrite8(hDevice, PCF50626_ADCC1_ADDR, 0x2D))
return NV_FALSE;
// Wait for conversion
NvOdmOsWaitUS(ADC_CONVERSION_DELAY_USEC);
// make sure the conversion is completed, or timeout.
while (timeout < ADC_CONVERSION_TIMEOUT_USEC)
{
if(! Pcf50626I2cRead8(hDevice, PCF50626_ADCS3_ADDR, &dataS3))
return NV_FALSE;
if (dataS3 & 0x80)
break;
NvOdmOsWaitUS(ADC_CONVERSION_DELAY_USEC);
timeout += ADC_CONVERSION_DELAY_USEC;
}
if (timeout >= ADC_CONVERSION_TIMEOUT_USEC)
{
NVODMPMU_PRINTF(("ADC conversion timeout.\n"));
return NV_FALSE;
}
// read the conversion result
if (!Pcf50626I2cRead8(hDevice, PCF50626_ADCS1_ADDR, &dataS1))
return NV_FALSE;
// Get result
*volt = (((NvU32)((dataS1 << 2) | (dataS3 & 0x03))) *
ADC_CONVERSION_VOLTAGE_RANGE * ADC_CONVERSION_DIVIDOR)
>> ADC_CONVERSION_PRECISION;
return NV_TRUE;
}
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