hwmon: (max6639) Fix FAN_FROM_REG calculation

BugLink: http://bugs.launchpad.net/bugs/954576

commit b63d97a36edb1aecf8c13e5f5783feff4d64c24b upstream.

RPM calculation from tachometer value does not depend on PPR.
Also, do not report negative RPM values.

Signed-off-by: Chris D Schimp <silverchris@gmail.com>
[guenter.roeck@ericsson.com: do not report negative RPM values]
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Acked-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/hwmon/max6639.c b/drivers/hwmon/max6639.c
index f20d9978ee7..1b844dbd9f7 100644
--- a/drivers/hwmon/max6639.c
+++ b/drivers/hwmon/max6639.c
@@ -72,8 +72,8 @@ static unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };
 
 static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };
 
-#define FAN_FROM_REG(val, div, rpm_range)       ((val) == 0 ? -1 : \
-        (val) == 255 ? 0 : (rpm_ranges[rpm_range] * 30) / ((div + 1) * (val)))
+#define FAN_FROM_REG(val, rpm_range)    ((val) == 0 || (val) == 255 ? \
+                                0 : (rpm_ranges[rpm_range] * 30) / (val))
 #define TEMP_LIMIT_TO_REG(val)  SENSORS_LIMIT((val) / 1000, 0, 255)
 
 /*
@@ -333,7 +333,7 @@ static ssize_t show_fan_input(struct device *dev,
                 return PTR_ERR(data);
 
         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
-                       data->ppr, data->rpm_range));
+                       data->rpm_range));
 }
 
 static ssize_t show_alarm(struct device *dev,