/*
 * 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;
}