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hwmon: (max6639) Fix FAN_FROM_REG calculation

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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>
This commit is contained in:
Chris D Schimp 2012-02-20 16:59:24 -05:00 committed by Guenter Roeck
parent b01543dfe6
commit b63d97a36e
1 changed files with 3 additions and 3 deletions
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6
drivers/hwmon/max6639.c
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@ -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,