[PATCH 3.14 19/87] hwmon: (adt7470) Fix writes to temperature limit registers

Greg Kroah-Hartman
2014-07-26T19:01:53Z

From: Guenter Roeck <linux@roeck-us.net>

commit de12d6f4b10b21854441f5242dcb29ea96181e58 upstream.

Temperature limit registers are signed. Limits therefore need
to be clamped to (-128, 127) degrees C and not to (0, 255)
degrees C.

Without this fix, writing a limit of 128 degrees C sets the
actual limit to -128 degrees C.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/hwmon/adt7470.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/hwmon/adt7470.c
+++ b/drivers/hwmon/adt7470.c
@@ -515,7 +515,7 @@ static ssize_t set_temp_min(struct devic
return -EINVAL;

temp = DIV_ROUND_CLOSEST(temp, 1000);
- temp = clamp_val(temp, 0, 255);
+ temp = clamp_val(temp, -128, 127);

mutex_lock(&data->lock);
data->temp_min[attr->index] = temp;
@@ -549,7 +549,7 @@ static ssize_t set_temp_max(struct devic
return -EINVAL;

temp = DIV_ROUND_CLOSEST(temp, 1000);
- temp = clamp_val(temp, 0, 255);
+ temp = clamp_val(temp, -128, 127);

mutex_lock(&data->lock);
data->temp_max[attr->index] = temp;
@@ -826,7 +826,7 @@ static ssize_t set_pwm_tmin(struct devic
return -EINVAL;

temp = DIV_ROUND_CLOSEST(temp, 1000);
- temp = clamp_val(temp, 0, 255);
+ temp = clamp_val(temp, -128, 127);

mutex_lock(&data->lock);
data->pwm_tmin[attr->index] = temp;