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Commit d5c09ffd authored by Rama Krishna Phani A's avatar Rama Krishna Phani A
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hwmon: qpnp-adc-voltage: Add temperature compensation for PM8909 



Add VBAT and OCV temperature compensation for PM8909.
The temperature compensation is required on top of
gain/offset calibration to compensate for variations
due to chip revision, manufacturer and temperature.

Change-Id: Icc325a5e4e2ef0cbc1298a26da329510cd2c350b
Signed-off-by: default avatarRama Krishna Phani A <rphani@codeaurora.org>
parent 2be5ff68

drivers/hwmon/qpnp-adc-voltage.c

+21 −0
Original line number Diff line number Diff line
@@ -748,6 +748,8 @@ static int32_t 
#define QPNP_VBAT_COEFF_48	2190

#define QPNP_VBAT_COEFF_49	4180

#define QPNP_VBAT_COEFF_50	27800000

#define QPNP_VBAT_COEFF_51	5110

#define QPNP_VBAT_COEFF_52	34444000



static int32_t qpnp_ocv_comp(int64_t *result,

			struct qpnp_vadc_chip *vadc, int64_t die_temp)
@@ -920,6 +922,13 @@ static int32_t qpnp_ocv_comp(int64_t *result, 
			break;

		}

		break;

	case QPNP_REV_ID_8909_1_1:

		switch (vadc->id) {

		case COMP_ID_SMIC:

			temp_var = (QPNP_VBAT_COEFF_52);

			break;

		}

		break;

	default:

		temp_var = 0;

		break;
@@ -1103,6 +1112,18 @@ static int32_t qpnp_vbat_sns_comp(int64_t *result, 
			break;

		}

		break;

	case QPNP_REV_ID_8909_1_1:

		switch (vadc->id) {

		case COMP_ID_SMIC:

			if (die_temp < 30000)

				temp_var = (QPNP_VBAT_COEFF_52);

			else if (die_temp > 30000)

				temp_var = (((die_temp - 30000) *

					(-QPNP_VBAT_COEFF_51)) +

					(QPNP_VBAT_COEFF_52));

			break;

		}

		break;

	default:

		temp_var = 0;

		break;