fuel_gauge: composite: query sources for capacity and soc

Query the configured data sources for capacity and soc information
before falling back to the composite fuel gauge configuration. This
means the battery properties are no longer required.

Signed-off-by: Jordan Yates <jordan@embeint.com>

Author: JordanYates

drivers/fuel_gauge/composite/fuel_gauge_composite.c

@@ -90,16 +90,25 @@ static int composite_get_prop(const struct device *dev, fuel_gauge_prop_t prop,
 
 	switch (prop) {
 	case FUEL_GAUGE_FULL_CHARGE_CAPACITY:
-		if (config->charge_capacity_microamp_hours == 0) {
-			return -ENOTSUP;
+		rc = composite_channel_get(dev, SENSOR_CHAN_GAUGE_FULL_AVAIL_CAPACITY, &sensor_val);
+		if (rc == -ENOTSUP) {
+			if (config->charge_capacity_microamp_hours == 0) {
+				return -ENOTSUP;
+			}
+			val->full_charge_capacity = config->charge_capacity_microamp_hours;
+			rc = 0;
 		}
-		val->full_charge_capacity = config->charge_capacity_microamp_hours;
 		break;
 	case FUEL_GAUGE_DESIGN_CAPACITY:
-		if (config->charge_capacity_microamp_hours == 0) {
-			return -ENOTSUP;
+		rc = composite_channel_get(dev, SENSOR_CHAN_GAUGE_FULL_CHARGE_CAPACITY,
+					   &sensor_val);
+		if (rc == -ENOTSUP) {
+			if (config->charge_capacity_microamp_hours == 0) {
+				return -ENOTSUP;
+			}
+			val->design_cap = config->charge_capacity_microamp_hours / 1000;
+			rc = 0;
 		}
-		val->full_charge_capacity = config->charge_capacity_microamp_hours / 1000;
 		break;
 	case FUEL_GAUGE_VOLTAGE:
 		sensor_chan = config->fg_channels ? SENSOR_CHAN_GAUGE_VOLTAGE : SENSOR_CHAN_VOLTAGE;
@@ -108,17 +117,24 @@ static int composite_get_prop(const struct device *dev, fuel_gauge_prop_t prop,
 		break;
 	case FUEL_GAUGE_ABSOLUTE_STATE_OF_CHARGE:
 	case FUEL_GAUGE_RELATIVE_STATE_OF_CHARGE:
-		if (config->ocv_lookup_table[0] == -1) {
-			return -ENOTSUP;
-		}
-		/* Fetch the voltage from the sensor */
-		sensor_chan = config->fg_channels ? SENSOR_CHAN_GAUGE_VOLTAGE : SENSOR_CHAN_VOLTAGE;
-		rc = composite_channel_get(dev, sensor_chan, &sensor_val);
-		voltage = sensor_value_to_micro(&sensor_val);
+		rc = composite_channel_get(dev, SENSOR_CHAN_GAUGE_STATE_OF_CHARGE, &sensor_val);
 		if (rc == 0) {
-			/* Convert voltage to state of charge */
-			val->relative_state_of_charge =
-				battery_soc_lookup(config->ocv_lookup_table, voltage) / 1000;
+			val->absolute_state_of_charge = sensor_val.val1;
+		} else if (rc == -ENOTSUP) {
+			if (config->ocv_lookup_table[0] == -1) {
+				return -ENOTSUP;
+			}
+			/* Fetch the voltage from the sensor */
+			sensor_chan = config->fg_channels ? SENSOR_CHAN_GAUGE_VOLTAGE
+							  : SENSOR_CHAN_VOLTAGE;
+			rc = composite_channel_get(dev, sensor_chan, &sensor_val);
+			voltage = sensor_value_to_micro(&sensor_val);
+			if (rc == 0) {
+				/* Convert voltage to state of charge */
+				val->relative_state_of_charge =
+					battery_soc_lookup(config->ocv_lookup_table, voltage) /
+					1000;
+			}
 		}
 		break;
 	case FUEL_GAUGE_CURRENT:

dts/bindings/fuel-gauge/zephyr,fuel-gauge-composite.yaml

@@ -31,9 +31,3 @@ properties:
       Sources should be queried by the sensor API fuel gauge
       channels (SENSOR_CHAN_GAUGE_*), instead of the generic
       channels (SENSOR_CHAN_VOLTAGE, etc).
-
-  device-chemistry:
-    required: true
-
-  ocv-capacity-table-0:
-    required: true