[64/89] hwmon: (w83627ehf) Disable setting DC mode for pwm2, pwm3 on NCT6776F

[Greg KH]

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guenter Roeck <linux@xxxxxxxxxxxx>

commit ad77c3e1808f07fa70f707b1c92a683b7c7d3f85 upstream.

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@xxxxxxxxxxxx>
Acked-by: Jean Delvare <khali@xxxxxxxxxxxx>
Signed-off-by: Guenter Roeck <guenter.roeck@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/hwmon/w83627ehf.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -1319,6 +1319,7 @@ store_pwm_mode(struct device *dev, struc
 {
 	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, struc
 
 	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;


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