Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit cddb6145 authored by Siddartha Mohanadoss's avatar Siddartha Mohanadoss
Browse files

iio: adc: Support reading SMB thermistor 



Add scaling support for reading SMB1390 thermistor from
VADC_USR peripheral.

Change-Id: I50e6fb54c897d17d648a34c709119d74471753d7
Signed-off-by: default avatarSiddartha Mohanadoss <smohanad@codeaurora.org>
parent 42123387

drivers/iio/adc/qcom-spmi-adc5.c

+5 −3
Original line number Diff line number Diff line
@@ -529,11 +529,11 @@ static const struct adc_channels adc_chans_pmic5[ADC_MAX_CHANNEL] = { 
					SCALE_HW_CALIB_DEFAULT)

	[ADC_XO_THERM_PU2]	= ADC_CHAN_TEMP("xo_therm", 1,

					SCALE_HW_CALIB_XOTHERM)

	[ADC_AMUX_THM1_PU2]	= ADC_CHAN_TEMP("amux_thm1", 1,

	[ADC_AMUX_THM1_PU2]	= ADC_CHAN_TEMP("amux_thm1_pu2", 1,

					SCALE_HW_CALIB_THERM_100K_PULLUP)

	[ADC_AMUX_THM2_PU2]	= ADC_CHAN_TEMP("amux_thm2", 1,

	[ADC_AMUX_THM2_PU2]	= ADC_CHAN_TEMP("amux_thm2_pu2", 1,

					SCALE_HW_CALIB_THERM_100K_PULLUP)

	[ADC_AMUX_THM3_PU2]	= ADC_CHAN_TEMP("amux_thm3", 1,

	[ADC_AMUX_THM3_PU2]	= ADC_CHAN_TEMP("amux_thm3_pu2", 1,

					SCALE_HW_CALIB_THERM_100K_PULLUP)

	[ADC_INT_EXT_ISENSE_VBAT_VDATA]	= ADC_CHAN_POWER("int_ext_isense", 1,

					SCALE_HW_CALIB_CUR)
@@ -541,6 +541,8 @@ static const struct adc_channels adc_chans_pmic5[ADC_MAX_CHANNEL] = { 
					SCALE_HW_CALIB_CUR)

	[ADC_PARALLEL_ISENSE_VBAT_VDATA] = ADC_CHAN_POWER("parallel_isense", 1,

					SCALE_HW_CALIB_CUR)

	[ADC_AMUX_THM2]			= ADC_CHAN_TEMP("amux_thm2", 1,

					SCALE_HW_CALIB_PM5_SMB_TEMP)

};



static const struct adc_channels adc_chans_rev2[ADC_MAX_CHANNEL] = {

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

+32 −0
Original line number Diff line number Diff line
@@ -306,6 +306,35 @@ static int qcom_vadc_scale_hw_calib_die_temp( 
	return 0;

}



static int qcom_vadc_scale_hw_smb_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;

	u64 temp;



	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) {

		temp = voltage * prescale->den;

		temp *= 100;

		do_div(temp, prescale->num * PMIC5_SMB_TEMP_SCALE_FACTOR);

		voltage = temp;

	} else {

		voltage = 0;

	}



	voltage = PMIC5_SMB_TEMP_CONSTANT - voltage;

	*result_mdec = voltage;



	return 0;

}



static int qcom_vadc_scale_hw_chg5_temp(

				const struct vadc_prescale_ratio *prescale,

				const struct adc_data *data,
@@ -412,6 +441,9 @@ int qcom_vadc_hw_scale(enum vadc_scale_fn_type scaletype, 
	case SCALE_HW_CALIB_PM5_CHG_TEMP:

		return qcom_vadc_scale_hw_chg5_temp(prescale, data,

						adc_code, result);

	case SCALE_HW_CALIB_PM5_SMB_TEMP:

		return qcom_vadc_scale_hw_smb_temp(prescale, data,

						adc_code, result);

	default:

		return -EINVAL;

	}

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

+5 −0
Original line number Diff line number Diff line
@@ -40,6 +40,8 @@ 


#define KELVINMIL_CELSIUSMIL			273150

#define PMIC5_CHG_TEMP_SCALE_FACTOR		377500

#define PMIC5_SMB_TEMP_CONSTANT			419400

#define PMIC5_SMB_TEMP_SCALE_FACTOR		356



#define PMI_CHG_SCALE_1				-138890

#define PMI_CHG_SCALE_2				391750000000LL
@@ -114,6 +116,8 @@ struct vadc_prescale_ratio { 
 * SCALE_HW_CALIB_CUR: Returns result in uA for PMIC5.

 * SCALE_HW_CALIB_PM5_CHG_TEMP: Returns result in millidegrees for PMIC5

 *	charger temperature.

 * SCALE_HW_CALIB_PM5_SMB_TEMP: Returns result in millidegrees for PMIC5

 *	SMB1390 temperature.

 */

enum vadc_scale_fn_type {

	SCALE_DEFAULT = 0,
@@ -127,6 +131,7 @@ enum vadc_scale_fn_type { 
	SCALE_HW_CALIB_PMIC_THERM,

	SCALE_HW_CALIB_CUR,

	SCALE_HW_CALIB_PM5_CHG_TEMP,

	SCALE_HW_CALIB_PM5_SMB_TEMP,

};



struct adc_data {