linux-kernel - [ 50/72] hwmon: (max6639) Fix FAN_FROM

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Message-Id: <20120228010433.819076125@linuxfoundation.org>
Date:	Mon, 27 Feb 2012 17:05:19 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Chris D Schimp <silverchris@...il.com>,
	Guenter Roeck <guenter.roeck@...csson.com>,
	Roland Stigge <stigge@...com.de>
Subject: [ 50/72] hwmon: (max6639) Fix FAN_FROM_REG calculation

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chris D Schimp <silverchris@...il.com>

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@...il.com>
[guenter.roeck@...csson.com: do not report negative RPM values]
Signed-off-by: Guenter Roeck <guenter.roeck@...csson.com>
Acked-by: Roland Stigge <stigge@...com.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hwmon/max6639.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/hwmon/max6639.c
+++ b/drivers/hwmon/max6639.c
@@ -72,8 +72,8 @@ static unsigned short normal_i2c[] = { 0
 
 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 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,


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