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

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

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
hifive-unleashed-5.1
Guenter Roeck 2012-12-04 07:59:32 -08:00
parent 5c25d954d3
commit 47ece9645f
1 changed files with 28 additions and 0 deletions
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28
drivers/hwmon/nct6775.c
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@ -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);