power: supply: generic-adc-battery: simplify read_channel logic

Drop mostly useless gab_prop_to_chan() function by directly
supplying the correct enum value to read_channel().

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Matti Vaittinen <mazziesaccount@gmail.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

Author: sre

drivers/power/supply/generic-adc-battery.c

@@ -86,31 +86,12 @@ static bool gab_charge_finished(struct gab *adc_bat)
 	return gpiod_get_value(adc_bat->charge_finished);
 }
 
-static enum gab_chan_type gab_prop_to_chan(enum power_supply_property psp)
-{
-	switch (psp) {
-	case POWER_SUPPLY_PROP_POWER_NOW:
-		return GAB_POWER;
-	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
-		return GAB_VOLTAGE;
-	case POWER_SUPPLY_PROP_CURRENT_NOW:
-		return GAB_CURRENT;
-	default:
-		WARN_ON(1);
-		break;
-	}
-	return GAB_POWER;
-}
-
-static int read_channel(struct gab *adc_bat, enum power_supply_property psp,
+static int read_channel(struct gab *adc_bat, enum gab_chan_type channel,
 		int *result)
 {
 	int ret;
-	int chan_index;
 
-	chan_index = gab_prop_to_chan(psp);
-	ret = iio_read_channel_processed(adc_bat->channel[chan_index],
-			result);
+	ret = iio_read_channel_processed(adc_bat->channel[channel], result);
 	if (ret < 0)
 		pr_err("read channel error\n");
 	else
@@ -123,26 +104,20 @@ static int gab_get_property(struct power_supply *psy,
 		enum power_supply_property psp, union power_supply_propval *val)
 {
 	struct gab *adc_bat = to_generic_bat(psy);
-	int result = 0;
-	int ret = 0;
 
 	switch (psp) {
 	case POWER_SUPPLY_PROP_STATUS:
 		val->intval = adc_bat->status;
 		return 0;
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		return read_channel(adc_bat, GAB_VOLTAGE, &val->intval);
 	case POWER_SUPPLY_PROP_CURRENT_NOW:
+		return read_channel(adc_bat, GAB_CURRENT, &val->intval);
 	case POWER_SUPPLY_PROP_POWER_NOW:
-		ret = read_channel(adc_bat, psp, &result);
-		if (ret < 0)
-			goto err;
-		val->intval = result;
-		break;
+		return read_channel(adc_bat, GAB_POWER, &val->intval);
 	default:
 		return -EINVAL;
 	}
-err:
-	return ret;
 }
 
 static void gab_work(struct work_struct *work)