hwmon: (nct7802) Fix wrong detection of in4 presence

The code to detect if in4 is present is wrong; if in4 is not present,
the in4_input sysfs attribute is still present.

In detail:

- Ihen RTD3_MD=11 (VSEN3 present), everything is as expected (no bug).
- If we have RTD3_MD!=11 (no VSEN3), we unexpectedly have a in4_input
  file under /sys and the "sensors" command displays in4_input.
  But as expected, we have no in4_min, in4_max, in4_alarm, in4_beep.

Fix is_visible function to detect and report in4_input visibility
as expected.

Reported-by: Gilles Buloz <Gilles.Buloz@kontron.com>
Cc: Gilles Buloz <Gilles.Buloz@kontron.com>
Cc: stable@vger.kernel.org
Fixes: 3434f37835804 ("hwmon: Driver for Nuvoton NCT7802Y")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/nct7802.c b/drivers/hwmon/nct7802.c
index ec7bcf8..f3dd2a1 100644 (file)
--- a/drivers/hwmon/nct7802.c
+++ b/drivers/hwmon/nct7802.c
@@ -704,7 +704,7 @@ static struct attribute *nct7802_in_attrs[] = {
        &sensor_dev_attr_in3_alarm.dev_attr.attr,
        &sensor_dev_attr_in3_beep.dev_attr.attr,
 
-       &sensor_dev_attr_in4_input.dev_attr.attr,       /* 17 */
+       &sensor_dev_attr_in4_input.dev_attr.attr,       /* 16 */
        &sensor_dev_attr_in4_min.dev_attr.attr,
        &sensor_dev_attr_in4_max.dev_attr.attr,
        &sensor_dev_attr_in4_alarm.dev_attr.attr,
@@ -730,9 +730,9 @@ static umode_t nct7802_in_is_visible(struct kobject *kobj,
 
        if (index >= 6 && index < 11 && (reg & 0x03) != 0x03)   /* VSEN1 */
                return 0;
-       if (index >= 11 && index < 17 && (reg & 0x0c) != 0x0c)  /* VSEN2 */
+       if (index >= 11 && index < 16 && (reg & 0x0c) != 0x0c)  /* VSEN2 */
                return 0;
-       if (index >= 17 && (reg & 0x30) != 0x30)                /* VSEN3 */
+       if (index >= 16 && (reg & 0x30) != 0x30)                /* VSEN3 */
                return 0;
 
        return attr->mode;