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/*
* Copyright (c) 2009 NVIDIA Corporation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NVIDIA Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#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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