hwmon: (it87) Enhance validation for fan4 and fan5
Several of the chips supported by this driver have a configuration
register to enable fan4 and fan5. Use those registers to determine
if fan4 and fan5 tachometers are supported.
Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index f40d81a..5adb269 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -2415,6 +2415,29 @@
superio_select(sioaddr, GPIO);
+ /* Check for fan4, fan5 */
+ if (has_five_fans(config)) {
+ reg = superio_inb(sioaddr, IT87_SIO_GPIO2_REG);
+ switch (sio_data->type) {
+ case it8718:
+ if (reg & BIT(5))
+ sio_data->skip_fan |= BIT(3);
+ if (reg & BIT(4))
+ sio_data->skip_fan |= BIT(4);
+ break;
+ case it8720:
+ case it8721:
+ case it8728:
+ if (!(reg & BIT(5)))
+ sio_data->skip_fan |= BIT(3);
+ if (!(reg & BIT(4)))
+ sio_data->skip_fan |= BIT(4);
+ break;
+ default:
+ break;
+ }
+ }
+
reg = superio_inb(sioaddr, IT87_SIO_GPIO3_REG);
if (!sio_data->skip_vid) {
/* We need at least 4 VID pins */