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Commit adb1d2c7 authored by Jishnu Prakash's avatar Jishnu Prakash
Browse files

iio: adc: spmi-adc5: Add support for PM2250 S3 die temp channel 



Add support for reading S3 die_temp channel on PM2250 by
specifying the scaling function.

Change-Id: I1e8fcba0058851a540bc39adc7606d4f0ad8f6db
Signed-off-by: default avatarJishnu Prakash <jprakash@codeaurora.org>
parent d7bfd382

drivers/iio/adc/qcom-vadc-common.c

+32 −0
Original line number Diff line number Diff line
@@ -1208,6 +1208,35 @@ static int qcom_vadc_scale_hw_smb1398_temp( 
	return 0;

}



static int qcom_vadc_scale_hw_pm2250_s3_die_temp(

				const struct vadc_prescale_ratio *prescale,

				const struct adc_data *data,

				u16 adc_code, int *result_mdec)

{

	s64 voltage = 0, adc_vdd_ref_mv = 1875;



	if (adc_code > VADC5_MAX_CODE)

		adc_code = 0;



	/* (ADC code * vref_vadc (1.875V)) / full_scale_code */

	voltage = (s64) adc_code * adc_vdd_ref_mv * 1000;

	voltage = div64_s64(voltage, data->full_scale_code_volt);

	if (voltage > 0) {

		voltage *= prescale->den;

		voltage = div64_s64(voltage, prescale->num);

	} else {

		voltage = 0;

	}



	voltage = PMIC5_PM2250_S3_DIE_TEMP_CONSTANT - voltage;

	voltage *= 100000;

	voltage = div64_s64(voltage, PMIC5_PM2250_S3_DIE_TEMP_SCALE_FACTOR);



	*result_mdec = voltage;



	return 0;

}



static int qcom_vadc_scale_hw_chg5_temp(

				const struct vadc_prescale_ratio *prescale,

				const struct adc_data *data,
@@ -1329,6 +1358,9 @@ int qcom_vadc_hw_scale(enum vadc_scale_fn_type scaletype, 
	case SCALE_HW_CALIB_PM5_SMB1398_TEMP:

		return qcom_vadc_scale_hw_smb1398_temp(prescale, data,

						adc_code, result);

	case SCALE_HW_CALIB_PM2250_S3_DIE_TEMP:

		return qcom_vadc_scale_hw_pm2250_s3_die_temp(prescale, data,

						adc_code, result);

	case SCALE_HW_CALIB_THERM_100K_PU_PM7:

		return qcom_vadc7_scale_hw_calib_therm(prescale, data,

						adc_code, result);

drivers/iio/adc/qcom-vadc-common.h

+6 −0
Original line number Diff line number Diff line
@@ -47,6 +47,9 @@ 
#define PMIC5_SMB1398_TEMP_SCALE_FACTOR	340

#define PMIC5_SMB1398_TEMP_CONSTANT		268235



#define PMIC5_PM2250_S3_DIE_TEMP_SCALE_FACTOR	187263

#define PMIC5_PM2250_S3_DIE_TEMP_CONSTANT		720100



#define PMI_CHG_SCALE_1				-138890

#define PMI_CHG_SCALE_2				391750000000LL
@@ -172,6 +175,8 @@ struct vadc_prescale_ratio { 
 * SCALE_HW_CALIB_BATT_THERM_400K: Returns battery thermistor voltage in

 *	decidegC using 400k pullup. The hardware applies offset/slope to adc

 *	code.

 * SCALE_HW_CALIB_PM2250_S3_DIE_TEMP: Returns result in millidegrees for

 *	S3 die temperature channel on PM2250.

 */

enum vadc_scale_fn_type {

	SCALE_DEFAULT = 0,
@@ -190,6 +195,7 @@ enum vadc_scale_fn_type { 
	SCALE_HW_CALIB_BATT_THERM_30K,

	SCALE_HW_CALIB_BATT_THERM_400K,

	SCALE_HW_CALIB_PM5_SMB1398_TEMP,

	SCALE_HW_CALIB_PM2250_S3_DIE_TEMP,

	SCALE_HW_CALIB_THERM_100K_PU_PM7,

	SCALE_HW_CALIB_PMIC_THERM_PM7,

	SCALE_HW_CALIB_MAX,