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Subject[PATCH v5 06/12] hwmon: (nct6775) Add support for fan debounce module parameter
Date
If set, fan debounce is enabled when loading the driver.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
drivers/hwmon/nct6775.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
index 828ed47..ac8be97 100644
--- a/drivers/hwmon/nct6775.c
+++ b/drivers/hwmon/nct6775.c
@@ -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 */
@@ -2107,6 +2113,28 @@ 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);
--
1.7.9.7


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