diff mbox series

[v2,3/5] hwmon: (max31790) Show 0 RPM/fault when input disabled

Message ID 20210413025948.901867-3-kubernat@cesnet.cz (mailing list archive)
State Superseded
Headers show
Series [v2,1/5] hwmon: (max31790) Rework to use regmap | expand

Commit Message

Václav Kubernát April 13, 2021, 2:59 a.m. UTC 
When fan speed input is disabled, it makes no sense to show values in
fan*_input and fan*_fault.

Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
---
 drivers/hwmon/max31790.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index ecdd55e12ffe..4fea32ff63bb 100644
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -166,6 +166,9 @@  static int max31790_read_fan(struct device *dev, u32 attr, int channel,
 
 	switch (attr) {
 	case hwmon_fan_input:
+		if (!(data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN))
+			return -ENODATA;
+
 		tach = read_reg_word(regmap, MAX31790_REG_TACH_COUNT(channel));
 		if (tach < 0)
 			return tach;
@@ -180,6 +183,11 @@  static int max31790_read_fan(struct device *dev, u32 attr, int channel,
 		*val = RPM_FROM_REG(tach, get_tach_period(data->fan_dynamics[channel]));
 		return 0;
 	case hwmon_fan_fault:
+		if (!(data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN)) {
+			*val = 0;
+			return 0;
+		}
+
 		if (channel > 6)
 			fault = read_reg_byte(regmap, MAX31790_REG_FAN_FAULT_STATUS2);
 		else