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hwmon: (nct6775) Improve fan detection

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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>
This commit is contained in:
Guenter Roeck 2017-05-17 18:09:41 -07:00
parent cc66b30382
commit e5c8522110
1 changed files with 36 additions and 7 deletions
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43
drivers/hwmon/nct6775.c
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@ -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;
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 (data->kind == nct6791 || data->kind == nct6792 ||
data->kind == nct6793) {
regval = superio_inb(sioreg, 0x2d);
fan6pin = (regval & BIT(1));
pwm6pin = (regval & BIT(0));
} else { /* NCT6779D */
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 */