hwmon: qpnp-adc: Add battery thermistor mapping table
Add mapping table used for converting battery thermistor
voltage to the corresponding temperature based on
the qrd resistive divider circuit.
Change-Id: I5d3a8fd446cc59e30192485f28a9436e5517350f
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
diff --git a/drivers/hwmon/qpnp-adc-common.c b/drivers/hwmon/qpnp-adc-common.c
index 0fab4d1..8e350f0 100644
--- a/drivers/hwmon/qpnp-adc-common.c
+++ b/drivers/hwmon/qpnp-adc-common.c
@@ -130,6 +130,60 @@
{790, 203}
};
+static const struct qpnp_vadc_map_pt adcmap_qrd_btm_threshold[] = {
+ {-200, 1672},
+ {-180, 1656},
+ {-160, 1639},
+ {-140, 1620},
+ {-120, 1599},
+ {-100, 1577},
+ {-80, 1553},
+ {-60, 1527},
+ {-40, 1550},
+ {-20, 1471},
+ {0, 1440},
+ {20, 1408},
+ {40, 1374},
+ {60, 1339},
+ {80, 1303},
+ {100, 1266},
+ {120, 1228},
+ {140, 1190},
+ {160, 1150},
+ {180, 1111},
+ {200, 1071},
+ {220, 1032},
+ {240, 992},
+ {260, 953},
+ {280, 915},
+ {300, 877},
+ {320, 841},
+ {340, 805},
+ {360, 770},
+ {380, 736},
+ {400, 704},
+ {420, 673},
+ {440, 643},
+ {460, 614},
+ {480, 587},
+ {500, 561},
+ {520, 536},
+ {540, 513},
+ {560, 491},
+ {580, 470},
+ {600, 450},
+ {620, 431},
+ {640, 414},
+ {660, 397},
+ {680, 382},
+ {700, 367},
+ {720, 353},
+ {740, 340},
+ {760, 328},
+ {780, 317},
+ {800, 306},
+};
+
/* Voltage to temperature */
static const struct qpnp_vadc_map_pt adcmap_100k_104ef_104fb[] = {
{1758, -40},
@@ -463,6 +517,24 @@
}
EXPORT_SYMBOL(qpnp_adc_scale_batt_therm);
+int32_t qpnp_adc_scale_qrd_batt_therm(int32_t adc_code,
+ const struct qpnp_adc_properties *adc_properties,
+ const struct qpnp_vadc_chan_properties *chan_properties,
+ struct qpnp_vadc_result *adc_chan_result)
+{
+ int64_t bat_voltage = 0;
+
+ bat_voltage = qpnp_adc_scale_ratiometric_calib(adc_code,
+ adc_properties, chan_properties);
+
+ return qpnp_adc_map_temp_voltage(
+ adcmap_qrd_btm_threshold,
+ ARRAY_SIZE(adcmap_qrd_btm_threshold),
+ bat_voltage,
+ &adc_chan_result->physical);
+}
+EXPORT_SYMBOL(qpnp_adc_scale_qrd_batt_therm);
+
int32_t qpnp_adc_scale_therm_pu1(int32_t adc_code,
const struct qpnp_adc_properties *adc_properties,
const struct qpnp_vadc_chan_properties *chan_properties,