diff options
| author | Guenter Roeck <linux@roeck-us.net> | 2017-05-17 18:09:41 -0700 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2017-06-11 17:08:19 -0700 |
| commit | e5c85221103830a9b234ca0bb957910799a95d7e (patch) | |
| tree | b72cf1a5395ccb7c31d33fbb1386a4a94eba31ca /drivers/hwmon | |
| parent | cc66b30382549aca35385c04f9a9911052c548ef (diff) | |
| download | talos-obmc-linux-e5c85221103830a9b234ca0bb957910799a95d7e.tar.gz talos-obmc-linux-e5c85221103830a9b234ca0bb957910799a95d7e.zip | |
hwmon: (nct6775) Improve fan detection
Recent chips support multiple pins for fan speed inputs and fan control
outputs. Examine all of them to determine supported fan controls.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/nct6775.c | 45 |
1 files changed, 37 insertions, 8 deletions
diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c index 318e0c5a34c8..4667691ca6a8 100644 --- a/drivers/hwmon/nct6775.c +++ b/drivers/hwmon/nct6775.c @@ -105,6 +105,7 @@ MODULE_PARM_DESC(fan_debounce, "Enable debouncing for fan RPM signal"); #define NCT6775_LD_ACPI 0x0a #define NCT6775_LD_HWM 0x0b #define NCT6775_LD_VID 0x0d +#define NCT6775_LD_12 0x12 #define SIO_REG_LDSEL 0x07 /* Logical device select */ #define SIO_REG_DEVID 0x20 /* Device ID (2 bytes) */ @@ -3392,6 +3393,8 @@ nct6775_check_fan_inputs(struct nct6775_data *data) pwm5pin = false; pwm6pin = false; } else { /* NCT6779D, NCT6791D, NCT6792D, or NCT6793D */ + int regval_1b, regval_2a, regval_eb; + regval = superio_inb(sioreg, 0x1c); fan3pin = !(regval & BIT(5)); @@ -3402,17 +3405,43 @@ nct6775_check_fan_inputs(struct nct6775_data *data) pwm4pin = !(regval & BIT(1)); pwm5pin = !(regval & BIT(2)); - fan4min = fan4pin; - - if (data->kind == nct6791 || data->kind == nct6792 || - data->kind == nct6793) { - regval = superio_inb(sioreg, 0x2d); - fan6pin = (regval & BIT(1)); - pwm6pin = (regval & BIT(0)); - } else { /* NCT6779D */ + regval = superio_inb(sioreg, 0x2d); + switch (data->kind) { + case nct6791: + case nct6792: + fan6pin = regval & BIT(1); + pwm6pin = regval & BIT(0); + break; + case nct6793: + regval_1b = superio_inb(sioreg, 0x1b); + regval_2a = superio_inb(sioreg, 0x2a); + + if (!pwm5pin) + pwm5pin = regval & BIT(7); + fan6pin = regval & BIT(1); + pwm6pin = regval & BIT(0); + if (!fan5pin) + fan5pin = regval_1b & BIT(5); + + superio_select(sioreg, NCT6775_LD_12); + regval_eb = superio_inb(sioreg, 0xeb); + if (!fan5pin) + fan5pin = regval_eb & BIT(5); + if (!pwm5pin) + pwm5pin = (regval_eb & BIT(4)) && + !(regval_2a & BIT(0)); + if (!fan6pin) + fan6pin = regval_eb & BIT(3); + if (!pwm6pin) + pwm6pin = regval_eb & BIT(2); + break; + default: /* NCT6779D */ fan6pin = false; pwm6pin = false; + break; } + + fan4min = fan4pin; } /* fan 1 and 2 (0x03) are always present */ |
