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Commit 03a96262 authored by Siddartha Mohanadoss's avatar Siddartha Mohanadoss
Browse files

hwmon: qpnp-adc-common: Clamp voltage value 



On VADC_HC peripheral the ADC code can extend beyond
0-0x4000 range if the input is below 0V or if the
offset and gain error needs to be calibrated out.
Clamp the values for cases where the code represents
the value below 0V.

Change-Id: I2ede3d86d812fbdf757395d92e08e70636e9965a
Signed-off-by: default avatarSiddartha Mohanadoss <smohanad@codeaurora.org>
parent 69bf7545

drivers/hwmon/qpnp-adc-common.c

+12 −0
Original line number Diff line number Diff line
@@ -39,6 +39,8 @@ 
#define PMI_CHG_SCALE_2		391750000000

#define QPNP_VADC_HC_VREF_CODE		0x4000

#define QPNP_VADC_HC_VDD_REFERENCE_MV	1875

/* Clamp negative ADC code to 0 */

#define QPNP_VADC_HC_MAX_CODE		0x7FFF



/* Units for temperature below (on x axis) is in 0.1DegC as

   required by the battery driver. Note the resolution used
@@ -752,6 +754,8 @@ int32_t qpnp_adc_scale_pmic_therm(struct qpnp_vadc_chip *vadc, 


	if (adc_properties->adc_hc) {

		/* (ADC code * vref_vadc (1.875V)) / 0x4000 */

		if (adc_code > QPNP_VADC_HC_MAX_CODE)

			adc_code = 0;

		pmic_voltage = (int64_t) adc_code;

		pmic_voltage *= (int64_t) (adc_properties->adc_vdd_reference

							* 1000);
@@ -862,6 +866,8 @@ int32_t qpnp_adc_tdkntcg_therm(struct qpnp_vadc_chip *chip, 


	if (adc_properties->adc_hc) {

		/* (ADC code * vref_vadc (1.875V) * 1000) / (0x4000 * 1000) */

		if (adc_code > QPNP_VADC_HC_MAX_CODE)

			adc_code = 0;

		xo_thm_voltage = (int64_t) adc_code;

		xo_thm_voltage *= (int64_t) (adc_properties->adc_vdd_reference

							* 1000);
@@ -1059,6 +1065,8 @@ int32_t qpnp_adc_scale_therm_pu2(struct qpnp_vadc_chip *chip, 


	if (adc_properties->adc_hc) {

		/* (ADC code * vref_vadc (1.875V) * 1000) / (0x4000 * 1000) */

		if (adc_code > QPNP_VADC_HC_MAX_CODE)

			adc_code = 0;

		therm_voltage = (int64_t) adc_code;

		therm_voltage *= (int64_t) (adc_properties->adc_vdd_reference

							* 1000);
@@ -1094,6 +1102,8 @@ int32_t qpnp_adc_tm_scale_voltage_therm_pu2(struct qpnp_vadc_chip *chip, 


	if (adc_properties->adc_hc) {

		/* (ADC code * vref_vadc (1.875V)) / 0x4000 */

		if (reg > QPNP_VADC_HC_MAX_CODE)

			reg = 0;

		adc_voltage = (int64_t) reg;

		adc_voltage *= QPNP_VADC_HC_VDD_REFERENCE_MV;

		adc_voltage = div64_s64(adc_voltage,
@@ -1228,6 +1238,8 @@ int32_t qpnp_adc_scale_default(struct qpnp_vadc_chip *vadc, 


	if (adc_properties->adc_hc) {

		/* (ADC code * vref_vadc (1.875V)) / 0x4000 */

		if (adc_code > QPNP_VADC_HC_MAX_CODE)

			adc_code = 0;

		scale_voltage = (int64_t) adc_code;

		scale_voltage *= (adc_properties->adc_vdd_reference * 1000);

		scale_voltage = div64_s64(scale_voltage,