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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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