[PATCH 6/7] hwmon: (max31790) Detect and report zero fan speed

[Guenter Roeck <linux@roeck-us.net>]

If a fan is not running or not connected, of if fan monitoring is disabled,
the fan count register returns a fixed value of 0xffe0. So far this is then
translated to a RPM value larger than 0. Since this is misleading and does
not really make much sense, report a fan RPM of 0 in this situation.

Cc: Jan Kundrát <jan.kundrat@cesnet.cz>
Cc: Václav Kubernát <kubernat@cesnet.cz>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/hwmon/max31790.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index 8e4fd9b7c889..91fe419b596c 100644
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -40,6 +40,8 @@
 #define FAN_RPM_MIN			120
 #define FAN_RPM_MAX			7864320
 
+#define FAN_COUNT_REG_MAX		0xffe0
+
 #define RPM_FROM_REG(reg, sr)		(((reg) >> 4) ? \
 					 ((60 * (sr) * 8192) / ((reg) >> 4)) : \
 					 FAN_RPM_MAX)
@@ -175,7 +177,10 @@ static int max31790_read_fan(struct device *dev, u32 attr, int channel,
 		return 0;
 	case hwmon_fan_input:
 		sr = get_tach_period(data->fan_dynamics[channel % NR_CHANNEL]);
-		rpm = RPM_FROM_REG(data->tach[channel], sr);
+		if (data->tach[channel] == FAN_COUNT_REG_MAX)
+			rpm = 0;
+		else
+			rpm = RPM_FROM_REG(data->tach[channel], sr);
 		*val = rpm;
 		return 0;
 	case hwmon_fan_target:
-- 
2.25.1