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Commit 47ece964 authored by Guenter Roeck's avatar Guenter Roeck
Browse files

hwmon: (nct6775) Add support for fan debounce module parameter 



If set, fan debounce is enabled when loading the driver.

Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 5c25d954

drivers/hwmon/nct6775.c

+28 −0
Original line number Diff line number Diff line
@@ -72,6 +72,10 @@ static unsigned short force_id; 
module_param(force_id, ushort, 0);

MODULE_PARM_DESC(force_id, "Override the detected device ID");



static unsigned short fan_debounce;

module_param(fan_debounce, ushort, 0);

MODULE_PARM_DESC(fan_debounce, "Enable debouncing for fan RPM signal");



#define DRVNAME "nct6775"



/*
@@ -183,6 +187,8 @@ static const u16 NCT6775_REG_IN[] = { 
#define NCT6775_REG_FANDIV1		0x506

#define NCT6775_REG_FANDIV2		0x507



#define NCT6775_REG_CR_FAN_DEBOUNCE	0xf0



static const u16 NCT6775_REG_ALARM[NUM_REG_ALARM] = { 0x459, 0x45A, 0x45B };



/* 0..15 voltages, 16..23 fans, 24..31 temperatures */
@@ -2110,6 +2116,28 @@ static int nct6775_probe(struct platform_device *pdev) 
	 */

	superio_select(sio_data->sioreg, NCT6775_LD_VID);

	data->vid = superio_inb(sio_data->sioreg, 0xe3);



	if (fan_debounce) {

		u8 tmp;



		superio_select(sio_data->sioreg, NCT6775_LD_HWM);

		tmp = superio_inb(sio_data->sioreg,

				  NCT6775_REG_CR_FAN_DEBOUNCE);

		switch (data->kind) {

		case nct6775:

			tmp |= 0x1e;

			break;

		case nct6776:

		case nct6779:

			tmp |= 0x3e;

			break;

		}

		superio_outb(sio_data->sioreg, NCT6775_REG_CR_FAN_DEBOUNCE,

			     tmp);

		dev_info(&pdev->dev, "Enabled fan debounce for chip %s\n",

			 data->name);

	}



	superio_exit(sio_data->sioreg);



	err = device_create_file(dev, &dev_attr_cpu0_vid);