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hwmon: (w83627ehf) Disable setting DC mode for pwm2, pwm3 on NCT6776F 

NCT6776F only supports pwm mode for pwm2 and pwm3. Return error if an attempt
is made to set those pwm channels to DC mode.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
Cc: stable@vger.kernel.org # 3.0+
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
hifive-unleashed-5.1
Guenter Roeck 2012-01-27 17:56:06 -08:00 committed by Guenter Roeck
parent 6edf3c30af
commit ad77c3e180
1 changed files with 6 additions and 0 deletions
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6
drivers/hwmon/w83627ehf.c
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@ -1319,6 +1319,7 @@ store_pwm_mode(struct device *dev, struct device_attribute *attr,
{
struct w83627ehf_data *data = dev_get_drvdata(dev);
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
struct w83627ehf_sio_data *sio_data = dev->platform_data;
int nr = sensor_attr->index;
unsigned long val;
int err;
@ -1330,6 +1331,11 @@ store_pwm_mode(struct device *dev, struct device_attribute *attr,
if (val > 1)
return -EINVAL;
/* On NCT67766F, DC mode is only supported for pwm1 */
if (sio_data->kind == nct6776 && nr && val != 1)
return -EINVAL;
mutex_lock(&data->update_lock);
reg = w83627ehf_read_value(data, W83627EHF_REG_PWM_ENABLE[nr]);
data->pwm_mode[nr] = val;