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authorGuenter Roeck <linux@roeck-us.net>2017-05-17 18:09:41 -0700
committerGuenter Roeck <linux@roeck-us.net>2017-06-11 17:08:19 -0700
commite5c85221103830a9b234ca0bb957910799a95d7e (patch)
treeb72cf1a5395ccb7c31d33fbb1386a4a94eba31ca /drivers/hwmon
parentcc66b30382549aca35385c04f9a9911052c548ef (diff)
downloadlinux-e5c85221103830a9b234ca0bb957910799a95d7e.tar.bz2
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.c45
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 */