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Commit a0df926d authored by Guenter Roeck's avatar Guenter Roeck
Browse files

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: default avatarMartin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent f1bbe618

drivers/hwmon/it87.c

+23 −0
Original line number Diff line number Diff line
@@ -2415,6 +2415,29 @@ static int __init it87_find(int sioaddr, unsigned short *address, 


		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 */