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Commit b12ac34a authored by Dipen Parmar's avatar Dipen Parmar
Browse files

hwmon: qpnp-adc-voltage: Add temperature compensation for PM8916 v2.0 



Add VBAT and OCV temperature compensation for PM8916
v2.0 for TSMC and GF parts.

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

Change-Id: I1e773a229f5a28780bffaf70979992fe4ed25e42
Signed-off-by: default avatarDipen Parmar <dipenp@codeaurora.org>
parent 5df047d2

drivers/hwmon/qpnp-adc-voltage.c

+38 −2
Original line number Diff line number Diff line
@@ -544,6 +544,14 @@ static int32_t qpnp_vadc_version_check(struct qpnp_vadc_chip *dev) 
#define QPNP_VBAT_COEFF_38	5000

#define QPNP_VBAT_COEFF_39	2610

#define QPNP_VBAT_COEFF_40	4190

#define QPNP_VBAT_COEFF_41	5800

#define QPNP_VBAT_COEFF_42	2620

#define QPNP_VBAT_COEFF_43	4030

#define QPNP_VBAT_COEFF_44	3230

#define QPNP_VBAT_COEFF_45	3450

#define QPNP_VBAT_COEFF_46	2120

#define QPNP_VBAT_COEFF_47	3560

#define QPNP_VBAT_COEFF_48	2190



static int32_t qpnp_ocv_comp(int64_t *result,

			struct qpnp_vadc_chip *vadc, int64_t die_temp)
@@ -692,8 +700,22 @@ static int32_t qpnp_ocv_comp(int64_t *result, 
						(-QPNP_VBAT_COEFF_37));

			}

			break;

		case COMP_ID_TSMC:

			if (die_temp < 10000)

				temp_var = ((die_temp - 10000) *

						QPNP_VBAT_COEFF_41);

			else if (die_temp > 50000)

				temp_var = ((die_temp - 50000) *

						(-QPNP_VBAT_COEFF_42));

			break;

		default:

			temp_var = 0;

		case COMP_ID_GF:

			if (die_temp < 20000)

				temp_var = ((die_temp - 20000) *

						QPNP_VBAT_COEFF_45);

			else if (die_temp > 40000)

				temp_var = ((die_temp - 40000) *

						(-QPNP_VBAT_COEFF_46));

			break;

		}

		break;
@@ -849,8 +871,22 @@ static int32_t qpnp_vbat_sns_comp(int64_t *result, 
				(-QPNP_VBAT_COEFF_40));

			}

			break;

		case COMP_ID_TSMC:

			if (die_temp < 10000)

				temp_var = ((die_temp - 10000) *

					QPNP_VBAT_COEFF_43);

			else if (die_temp > 50000)

				temp_var = ((die_temp - 50000) *

						(-QPNP_VBAT_COEFF_44));

			break;

		default:

			temp_var = 0;

		case COMP_ID_GF:

			if (die_temp < 20000)

				temp_var = ((die_temp - 20000) *

					QPNP_VBAT_COEFF_47);

			else if (die_temp > 40000)

				temp_var = ((die_temp - 40000) *

						(-QPNP_VBAT_COEFF_48));

			break;

		}

		break;