summaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
authorChris D Schimp <silverchris@gmail.com>2012-02-20 16:59:24 -0500
committerGuenter Roeck <guenter.roeck@ericsson.com>2012-02-21 14:30:12 -0800
commitb63d97a36edb1aecf8c13e5f5783feff4d64c24b (patch)
treecc84e698347ae3aa26ff88f7adfe5f505edc7b83 /drivers
parentb01543dfe67bb1d191998e90d20534dc354de059 (diff)
hwmon: (max6639) Fix FAN_FROM_REG calculation
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> Cc: stable@vger.kernel.org # 3.0+ Acked-by: Roland Stigge <stigge@antcom.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/hwmon/max6639.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/hwmon/max6639.c b/drivers/hwmon/max6639.c
index e10a092c603c..13e58a1992cf 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,