[PATCH 3.16 060/366] hwmon: (nct6775) Fix writing pwmX_mode

Ben Hutchings
2018-10-14T23:29:51Z

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

commit 415eb2a1aaa4881cf85bd86c683356fdd8094a23 upstream.

pwmX_mode is defined in the ABI as 0=DC mode, 1=pwm mode. The chip
register bit is set to 1 for DC mode. This got mixed up, and writing
1 into pwmX_mode resulted in DC mode enabled. Fix it up by using
the ABI definition throughout the driver for consistency.

Fixes: 77eb5b3703d99 ("hwmon: (nct6775) Add support for pwm, pwm_mode, ... ")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/hwmon/nct6775.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

--- a/drivers/hwmon/nct6775.c
+++ b/drivers/hwmon/nct6775.c
@@ -1287,7 +1287,7 @@ static void nct6775_update_pwm(struct de
duty_is_dc = data->REG_PWM_MODE[i] &&
(nct6775_read_value(data, data->REG_PWM_MODE[i])
& data->PWM_MODE_MASK[i]);
- data->pwm_mode[i] = duty_is_dc;
+ data->pwm_mode[i] = !duty_is_dc;

fanmodecfg = nct6775_read_value(data, data->REG_FAN_MODE[i]);
for (j = 0; j < ARRAY_SIZE(data->REG_PWM); j++) {
@@ -2146,7 +2146,7 @@ show_pwm_mode(struct device *dev, struct
struct nct6775_data *data = nct6775_update_device(dev);
struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);

- return sprintf(buf, "%d\n", !data->pwm_mode[sattr->index]);
+ return sprintf(buf, "%d\n", data->pwm_mode[sattr->index]);
}

static ssize_t
@@ -2167,9 +2167,9 @@ store_pwm_mode(struct device *dev, struc
if (val > 1)
return -EINVAL;

- /* Setting DC mode is not supported for all chips/channels */
+ /* Setting DC mode (0) is not supported for all chips/channels */
if (data->REG_PWM_MODE[nr] == 0) {
- if (val)
+ if (!val)
return -EINVAL;
return count;
}
@@ -2178,7 +2178,7 @@ store_pwm_mode(struct device *dev, struc
data->pwm_mode[nr] = val;
reg = nct6775_read_value(data, data->REG_PWM_MODE[nr]);
reg &= ~data->PWM_MODE_MASK[nr];
- if (val)
+ if (!val)
reg |= data->PWM_MODE_MASK[nr];
nct6775_write_value(data, data->REG_PWM_MODE[nr], reg);
mutex_unlock(&data->update_lock);