ap/os/linux/linux-3.4.x/drivers/mfd/zx234290-adc.c

#include <linux/init.h>        /* For init/exit macros */
#include <linux/module.h>      /* For MODULE_ marcros  */
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>

#include <linux/device.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/kthread.h>
#include <linux/rtc.h>
#include <linux/mfd/zx234290.h>
#include <mach/spinlock.h>
#include <linux/wakelock.h>

#define ZX234290_VBAT_ADC_COMPENDATE_VALUE  50
typedef enum adc_channel
{
    ADC_CHANNEL_VBAT_ADC = 0,
    ADC_CHANNEL_VADC2 = 1,	/* 01 */
    ADC_CHANNEL_VADC1 = 2,	/* 10 */
    MAX_ADC_CHANNEL
}zx234290_adc_channel;

/*******************************************************************************
 * Function:zx234290_adc_correspond
 * Description:adjust battery voltage  according to compensate value
 * Parameters:
 *	 Input:
 *        channel: adc channel
 *        value:battery voltage  needed be compensated
 *	 Output:
 *
 * Returns:
 *    0:  success
 *     -1:failed
 *
 * Others:
 ********************************************************************************/
static int zx234290_adc_correspond(zx234290_adc_channel channel, int *value)
{
	int nTemp;

	switch (channel)
	{
		case ADC_CHANNEL_VBAT_ADC:
			{
				nTemp = (int)((uint64_t)(5000-0)*(*value)/4096);
				*value = nTemp + 0;//ZX234290_VBAT_ADC_COMPENDATE_VALUE; // compensate the battery voltage value
				break;
			}
		case ADC_CHANNEL_VADC1:
			{
				nTemp = (int)((uint64_t)(5000-0)*(*value)/4096);
				*value = nTemp + 0;
				break;
			}

		case ADC_CHANNEL_VADC2:
			{
				nTemp = (int)((uint64_t)(5000-0)*(*value)/4096);
				*value = nTemp + 0;
				break;
			}
		default:
			{
				return -1;
			}
	}


	return 0;

}

/*******************************************************************************
 * Function:zx234290_adc_read_vbat
 * Description:read vbat adc value
 * Parameters:
 *	 Input:
 *
 *	 Output:
 *
 * Returns:
 *    nTempAdc:the value of vbat adc
 * Others:
 ********************************************************************************/
static int zx234290_adc_read_vbat(void)
{
	int nRet;
	int nTempAdc = 0;
	unsigned char msb=0, lsb=0;

	/* read msb */
	//nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_ADC_VBATMSB, &msb);
	nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_VBATADC_MSB, &msb);
	if (nRet != 0)
	{
		return nRet;
	}

	/* read lsb */
	//nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_ADC_VBATLSB, &lsb);
	nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_VBATADC_LSB, &lsb);
	if (nRet != 0)
	{
		return nRet;
	}
	nTempAdc = (int)msb;
	nTempAdc = ((nTempAdc<<4)|lsb>>4);

	return nTempAdc;
}

/*******************************************************************************
 * Function:zx234290_adc_read_adc1
 * Description:read the channel of  adc1 value
 * Parameters:
 *	 Input:
 *
 *	 Output:
 *
 * Returns:
 *    nTempAdc:the value of  adc1 channel
 * Others:
 ********************************************************************************/
static int zx234290_adc_read_adc1(void)
{
	int nRet;
	int nTempAdc = 0;
	unsigned char msb=0, lsb=0;

    /* read msb */
	//nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_ADC1MSB, &msb);
	nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_ADC1_MSB, &msb);
	if (nRet != 0)
	{
		return nRet;
	}

	/* read lsb */
	//nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_ADC1LSB, &lsb);
	nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_ADC1_LSB, &lsb);
	if (nRet != 0)
	{
		return nRet;
	}

	nTempAdc = (int)msb;
	nTempAdc = ((nTempAdc<<4)|lsb>>4);

	return nTempAdc;
}

/*******************************************************************************
 * Function:zx234290_adc_read_adc2
 * Description:read the channel of  adc2value
 * Parameters:
 *	 Input:
 *
 *	 Output:
 *
 * Returns:
 *    nTempAdc:the value of  adc2 channel
 * Others:
 ********************************************************************************/
static int zx234290_adc_read_adc2(void)
{
	int nRet;
	int nTempAdc = 0;
	unsigned char msb=0, lsb=0;

	 /* read msb */
	//nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_ADC2MSB, &msb);
	nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_ADC2_MSB, &msb);
	if (nRet != 0)
	{
		return nRet;
	}

	/* read lsb */
	//nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_ADC2LSB, &lsb);
	nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_ADC2_LSB, &lsb);
	if (nRet != 0)
	{
		return nRet;
	}

	nTempAdc = (int)msb;
	nTempAdc = ((nTempAdc<<4)|lsb>>4);

	return nTempAdc;
}


/**************************************************************************
* Function: 	zx234290_adc_read
* Description:	read ADC value according to adc channel
* Parameters:
*	Input:
*       channel:which channel want to be read
*
*	Output:
*       value:the adc value correspond to channel
* Returns:
*				0 if success, not 0 if faile
* Others: None
**************************************************************************/
extern struct wake_lock adc_wake_lock;
static int zx234290_adc_read(zx234290_adc_channel channel, int *value)
{
	int nRet = 0;
	int nTempAdc = 0;
	int  reg_val=0, mask=0;
	int num=1;
	unsigned char status_a=0;
    unsigned char content =0;
	if(channel >= MAX_ADC_CHANNEL)
	{
		return -1;
	}

	soft_spin_lock(ADC_SFLOCK);
	wake_lock(&adc_wake_lock);
	if (channel != ADC_CHANNEL_VBAT_ADC)
	{
		/* select channel */
		reg_val = channel << 3;	/* ×óÒÆ3λ£¬Î»¿í 2λ	*/
		mask = 0x18;
		nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_SYS_CTRL, &content);
	        if (nRet != 0)
	        {
	        	wake_unlock(&adc_wake_lock);
	        	soft_spin_unlock(ADC_SFLOCK);
			return nRet;
	        }
		content &= ~mask;
		content |= reg_val;
		nRet = zx234290_i2c_write_simple(ZX234290_REG_ADDR_SYS_CTRL, &content);
		if (nRet != 0)
		{
			wake_unlock(&adc_wake_lock);
	        	soft_spin_unlock(ADC_SFLOCK);
			return nRet;
		}
	}
#if 0
	/* set start bit */
	reg_val = 1 << 5; /* ¸ÃλÖà 1	*/
	mask = 0x20;
	nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_SYS_CTRL, &content);
    if (nRet != 0)
    {
        return nRet;
    }
    content &= ~mask;
    content |= reg_val;
	nRet = zx234290_i2c_write_simple(ZX234290_REG_ADDR_SYS_CTRL, &content);
	if (nRet != 0)
	{
		return nRet;
	}

	msleep(30);        /* ÑÓʱ30ms */
#else
	reg_val = 1 << 5; /* ¸ÃλÖà 1	*/
	mask = 0x20;
	for(num=1; num <= 50; num++)
	{
		/* set start bit */
		nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_SYS_CTRL, &content);
		if (nRet != 0)
		{
			wake_unlock(&adc_wake_lock);
			soft_spin_unlock(ADC_SFLOCK);
			return nRet;
		}
		content &= ~mask;
		content |= reg_val;
		nRet = zx234290_i2c_write_simple(ZX234290_REG_ADDR_SYS_CTRL, &content);
		if (nRet != 0)
		{
			wake_unlock(&adc_wake_lock);
			soft_spin_unlock(ADC_SFLOCK);
			return nRet;
		}
		udelay(500);
		/*read status_A*/
		nRet = zx234290_i2c_read_simple(ZX234290_REG_ADDR_STSA, &status_a);
		if (nRet != 0)
		{
			wake_unlock(&adc_wake_lock);
			soft_spin_unlock(ADC_SFLOCK);
			return nRet;
	    }
		if(status_a & 0x04)
		{
//			printk( "get adc,break num =%d ...\n", num);
			break;
		}
	}
#endif
	/* ÕâÀïÒªµÈÖжÏÀ´ ²ÅÄܶÁ	*/
	switch (channel) {
	case ADC_CHANNEL_VBAT_ADC:
		nTempAdc = zx234290_adc_read_vbat();
		break;
	case ADC_CHANNEL_VADC1:
		nTempAdc = zx234290_adc_read_adc1();
		break;
	case ADC_CHANNEL_VADC2:
		nTempAdc = zx234290_adc_read_adc2();
		break;
	default:
		break;
	}

	if (nTempAdc < 0)
	{
		wake_unlock(&adc_wake_lock);
		soft_spin_unlock(ADC_SFLOCK);
		return 0;
	}

	/* ת»» */
	zx234290_adc_correspond(channel, &nTempAdc);
	*value = (int)nTempAdc;
	wake_unlock(&adc_wake_lock);
	soft_spin_unlock(ADC_SFLOCK);
	//pmic_AdcUnlock();
	return nRet;
}



/**************************************************************************
* Function: 	get_battery_voltage
* Description:	get battery voltage
* Parameters:
*	Input:
*
*
*	Output:
*
* Returns:
*	avgValue:battery voltage
* Others: None
**************************************************************************/
uint get_battery_voltage(void)
{
	int counter = 3;
	int index=0;
	int tmpValue=0,totalValue=0;
	uint avgValue;
	
	for(index = 0; index < counter; index++)
	{
		zx234290_adc_read(ADC_CHANNEL_VBAT_ADC, &tmpValue);
		totalValue += tmpValue;
	}
	avgValue = (uint)(totalValue / counter);
	return avgValue;
}
EXPORT_SYMBOL(get_battery_voltage);

/**************************************************************************
* Function: 	get_adc1_voltage
* Description:	get adc1 voltage
* Parameters:
*	Input:
*
*
*	Output:
*
* Returns:
*	avgValue:adc voltage
* Others: None
**************************************************************************/
uint get_adc1_voltage(void)
{
	int counter = 3;
	int index=0;
	int tmpValue=0,totalValue=0;
	uint avgValue;
		
	for(index = 0; index < counter; index++)
	{
		zx234290_adc_read(ADC_CHANNEL_VADC1, &tmpValue);
		totalValue += tmpValue;
	}
	avgValue = (uint)(totalValue / counter);
	return avgValue;
}
EXPORT_SYMBOL(get_adc1_voltage);

/**************************************************************************
* Function: 	get_adc2_voltage
* Description:	get adc2 voltage
* Parameters:
*	Input:
*
*
*	Output:
*
* Returns:
*	avgValue:adc2 voltage
* Others: None
**************************************************************************/
//extern struct wake_lock adc_wake_lock;
uint get_adc2_voltage(void)
{
	int counter = 3;
	int index=0;
	int tmpValue=0,totalValue=0;
	uint avgValue;

	//wake_lock(&adc_wake_lock);
	for(index = 0; index < counter; index++)
	{
		zx234290_adc_read(ADC_CHANNEL_VADC2, &tmpValue);
		totalValue += tmpValue;
	}
	//wake_unlock(&adc_wake_lock);
	avgValue = (uint)(totalValue / counter);
	return avgValue;
}
EXPORT_SYMBOL(get_adc2_voltage);