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

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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>
This commit is contained in:
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;