ASoC: rouleur: Change hph and ear gain according to soc capacity

Register to power supply framework to get soc capacity.
Reduce ear and hph gain for reduced voltage to optimize
power consumption. Also set LD22 voltage to lower value
for low SoC.

Change-Id: I94de9341b8c7307128d3cd41c7398c31d57fa685
Signed-off-by: Vatsal Bucha <vbucha@codeaurora.org>

asoc/codecs/msm-cdc-supply.c

@@ -173,6 +173,52 @@ bool msm_cdc_is_ondemand_supply(struct device *dev,
 }
 EXPORT_SYMBOL(msm_cdc_is_ondemand_supply);
 
+/*
+ * msm_cdc_set_supply_min_voltage:
+ *	Set min supply voltage for particular supply
+ *
+ * @dev: pointer to codec device
+ * @supplies: pointer to regulator bulk data
+ * @cdc_vreg: pointer to platform regulator data
+ * @num_supplies: number of supplies
+ * @supply_name: Supply name to change voltage for
+ * @vval_min: Min voltage to be set in uV
+ * @override_min_vol: True if override min voltage from default
+ * Return error code if unable to set voltage
+ */
+int msm_cdc_set_supply_min_voltage(struct device *dev,
+				    struct regulator_bulk_data *supplies,
+				    struct cdc_regulator *cdc_vreg,
+				    int num_supplies, char *supply_name,
+				    int vval_min, bool override_min_vol)
+{
+	int rc = 0, i;
+
+	if ((!supply_name) || (!supplies)) {
+		pr_err("%s: either dev or supplies or cdc_vreg is NULL\n",
+				__func__);
+		return -EINVAL;
+	}
+	/* input parameter validation */
+	rc = msm_cdc_check_supply_param(dev, cdc_vreg, num_supplies);
+	if (rc)
+		return rc;
+	for (i = 0; i < num_supplies; i++) {
+		if (!strcmp(cdc_vreg[i].name, supply_name)) {
+			if (override_min_vol)
+				regulator_set_voltage(supplies[i].consumer,
+					vval_min, cdc_vreg[i].max_uV);
+			else
+				regulator_set_voltage(supplies[i].consumer,
+				    cdc_vreg[i].min_uV, cdc_vreg[i].max_uV);
+			break;
+		}
+	}
+
+	return rc;
+}
+EXPORT_SYMBOL(msm_cdc_set_supply_min_voltage);
+
 /*
  * msm_cdc_disable_ondemand_supply:
  *	Disable codec ondemand supply