This is a note to let you know that I've just added the patch titled
hwmon: (w83l768ng) Fix fan speed control range
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
hwmon-w83l768ng-fix-fan-speed-control-range.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 33a7ab91d509fa33b4bcd3ce0038cc80298050da Mon Sep 17 00:00:00 2001
From: Jean Delvare <khali@xxxxxxxxxxxx>
Date: Thu, 12 Dec 2013 08:05:32 +0100
Subject: hwmon: (w83l768ng) Fix fan speed control range
From: Jean Delvare <khali@xxxxxxxxxxxx>
commit 33a7ab91d509fa33b4bcd3ce0038cc80298050da upstream.
The W83L786NG stores the fan speed on 4 bits while the sysfs interface
uses a 0-255 range. Thus the driver should scale the user input down
to map it to the device range, and scale up the value read from the
device before presenting it to the user. The reserved register nibble
should be left unchanged.
Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hwmon/w83l786ng.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/drivers/hwmon/w83l786ng.c
+++ b/drivers/hwmon/w83l786ng.c
@@ -481,9 +481,11 @@ store_pwm(struct device *dev, struct dev
if (err)
return err;
val = SENSORS_LIMIT(val, 0, 255);
+ val = DIV_ROUND_CLOSEST(val, 0x11);
mutex_lock(&data->update_lock);
- data->pwm[nr] = val;
+ data->pwm[nr] = val * 0x11;
+ val |= w83l786ng_read_value(client, W83L786NG_REG_PWM[nr]) & 0xf0;
w83l786ng_write_value(client, W83L786NG_REG_PWM[nr], val);
mutex_unlock(&data->update_lock);
return count;
@@ -782,8 +784,9 @@ static struct w83l786ng_data *w83l786ng_
? 0 : 1;
data->pwm_enable[i] =
((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 3) + 1;
- data->pwm[i] = w83l786ng_read_value(client,
- W83L786NG_REG_PWM[i]);
+ data->pwm[i] =
+ (w83l786ng_read_value(client, W83L786NG_REG_PWM[i])
+ & 0x0f) * 0x11;
}
Patches currently in stable-queue which might be from khali@xxxxxxxxxxxx are
queue-3.4/hwmon-w83l768ng-fix-fan-speed-control-range.patch
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