[PATCH 6.4 360/800] hwmon: (gsc-hwmon) fix fan pwm temperature scaling

Greg Kroah-Hartman
2023-07-16T20:09:41Z

From: Tim Harvey <tharvey@gateworks.com>

[ Upstream commit a6d80df47ee2c69db99e4f2f8871aa4db154620b ]

The GSC fan pwm temperature register is in centidegrees celcius but the
Linux hwmon convention is to use milidegrees celcius. Fix the scaling.

Fixes: 3bce5377ef66 ("hwmon: Add Gateworks System Controller support")
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Link: https://lore.kernel.org/r/20230606153004.1448086-1-tharvey@gateworks.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/hwmon/gsc-hwmon.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/hwmon/gsc-hwmon.c b/drivers/hwmon/gsc-hwmon.c
index 73e5d92b200b0..1501ceb551e79 100644
--- a/drivers/hwmon/gsc-hwmon.c
+++ b/drivers/hwmon/gsc-hwmon.c
@@ -82,8 +82,8 @@ static ssize_t pwm_auto_point_temp_store(struct device *dev,
if (kstrtol(buf, 10, &temp))
return -EINVAL;

- temp = clamp_val(temp, 0, 10000);
- temp = DIV_ROUND_CLOSEST(temp, 10);
+ temp = clamp_val(temp, 0, 100000);
+ temp = DIV_ROUND_CLOSEST(temp, 100);

regs[0] = temp & 0xff;
regs[1] = (temp >> 8) & 0xff;
@@ -100,7 +100,7 @@ static ssize_t pwm_auto_point_pwm_show(struct device *dev,
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

- return sprintf(buf, "%d\n", 255 * (50 + (attr->index * 10)) / 100);
+ return sprintf(buf, "%d\n", 255 * (50 + (attr->index * 10)));
}

static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point1_pwm, pwm_auto_point_pwm, 0);
--
2.39.2