[PATCH v2 4/8] power: supply: core: tabularize HWMON temperature labels

[MichaÅ MirosÅaw]

Rework power_supply_hwmon_read_string() to check it's parameters.
This allows to extend it later with labels for other types of
measurements.

Signed-off-by: MichaÅ MirosÅaw <mirq-linux@xxxxxxxxxxxx>
---
v2: split from fix temperature labels
---
 drivers/power/supply/power_supply_hwmon.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/power/supply/power_supply_hwmon.c b/drivers/power/supply/power_supply_hwmon.c
index 67b6ee60085e..48c73994732c 100644
--- a/drivers/power/supply/power_supply_hwmon.c
+++ b/drivers/power/supply/power_supply_hwmon.c
@@ -43,6 +43,11 @@ static int power_supply_hwmon_curr_to_property(u32 attr)
 	}
 }
 
+static const char *const ps_temp_label[] = {
+	"temp",
+	"ambient temp",
+};
+
 static int power_supply_hwmon_temp_to_property(u32 attr, int channel)
 {
 	if (channel) {
@@ -144,8 +149,20 @@ static int power_supply_hwmon_read_string(struct device *dev,
 					  u32 attr, int channel,
 					  const char **str)
 {
-	*str = channel ? "temp ambient" : "temp";
-	return 0;
+	if (channel < 0)
+		return -EINVAL;
+
+	switch (type) {
+	case hwmon_temp:
+		if (channel >= ARRAY_SIZE(ps_temp_label))
+			return -EINVAL;
+		*str = ps_temp_label[channel];
+		return 0;
+	default:
+		break;
+	}
+
+	return -EINVAL;
 }
 
 static int
-- 
2.20.1