[PATCH] hwmon: (it87) Add support for IT8607E
From: Ismael Ojeda Perez
Date: Sun Nov 01 2026 - 18:51:38 EST
The IT8607E is the Super I/O of the Intel NUC6i3SYB and, according to
Intel's product specification, the NUC6i5SYB (BIOS SYSKLi35.86A). Its
environment controller is hidden from ACPI (HHMD._STA returns 0), so the
chip is only reachable through the LPC configuration ports, and the ACPI
resource check must be bypassed with ignore_resource_conflict=1.
No datasheet is available. The register layout was compared against the
IT8603E, and the BIOS fan setup (IT8607PeiInit and FanPei PEI modules of
SYSKLi35.86A.0071) was disassembled to confirm it programs the same
"newer autopwm" registers (0x68-0x6d for pwm2). Features are therefore
copied from the IT8603E.
Tested on a NUC6i3SYB (BIOS SYSKLi35.86A.0042, chip ID 0x8607, rev 2):
temperatures agree with coretemp, +3.3V reads 3.31 V, the 3VSB and VBAT
inputs read plausible values, fan2 tach and pwm2 respond to the
automatic-curve registers (start 74 C, full speed 92 C, as programmed by
the BIOS) and to manual mode, and the original values are restored.
The tachometer was not compared with an external tachometer and the
voltage scaling was not compared with a multimeter; the values above are
only cross-checked against coretemp and the expected rail voltages.
Signed-off-by: Ismael Ojeda Perez <iojedaperez@xxxxxxxxx>
---
Notes (not part of the commit message):
Based on the hwmon-next branch of groeck/linux-staging.git (file contents
as of 2026-11-01). Also compiled as a module against 6.18.58.
Sample output on the NUC6i3SYB with it87 loaded with
ignore_resource_conflict=1 (raw sysfs, hwmon5 = it8607):
in0_input=828 in1_input=1212 in2_input=2004 in3_input=2004
in4_input=2016 in7_input=3312 (3VSB) in8_input=2808 (Vbat)
in9_input=3312 (+3.3V)
temp1_input=72000 temp2_input=67000 temp3_input=74000
fan1_input=0 fan2_input=4623
pwm2=89 pwm2_enable=2
The Super I/O is found at 0x2e, chip ID 0x8607, revision 2, and the
hardware monitor at 0xa40; ACPI reserves that range, hence the module
parameter. Is that acceptable, or would you prefer a DMI quirk for the
NUC6 boards?
Documentation/hwmon/it87.rst | 16 +++++++++++++++-
drivers/hwmon/Kconfig | 4 ++--
drivers/hwmon/it87.c | 17 +++++++++++++++--
3 files changed, 32 insertions(+), 5 deletions(-)
diff --git a/Documentation/hwmon/it87.rst b/Documentation/hwmon/it87.rst
index c33ba8a..17bfffb 100644
--- a/Documentation/hwmon/it87.rst
+++ b/Documentation/hwmon/it87.rst
@@ -19,6 +19,14 @@ Supported chips:
Datasheet: Not publicly available
+ * IT8607E
+
+ Prefix: 'it8607'
+
+ Addresses scanned: from Super I/O config space (8 I/O ports)
+
+ Datasheet: Not publicly available
+
* IT8620E
Prefix: 'it8620'
@@ -243,7 +251,7 @@ motherboard models.
Description
-----------
-This driver implements support for the IT8603E, IT8620E, IT8623E, IT8628E,
+This driver implements support for the IT8603E, IT8607E, IT8620E, IT8623E, IT8628E,
IT8689E, IT8705F, IT8712F, IT8716F, IT8718F, IT8720F, IT8721F, IT8726F,
IT8728F, IT8732F, IT8758E, IT8771E, IT8772E, IT8781F, IT8782F, IT8783E/F,
IT8786E, IT8790E, IT8792E/IT8795E, IT87952E and SiS950 chips.
@@ -287,6 +295,12 @@ The IT8603E/IT8623E is a custom design, hardware monitoring part is similar to
IT8728F. It only supports 3 fans, 16-bit fan mode, and the full speed mode
of the fan is not supported (value 0 of pwmX_enable).
+The IT8607E is found on the Intel NUC6i3SYB and NUC6i5SYB boards. The hardware
+monitoring part is treated as compatible with the IT8603E (16-bit fans, newer
+autopwm registers) because no datasheet is available. The BIOS keeps the
+environment controller hidden from ACPI, so the driver can only be loaded
+with ``ignore_resource_conflict=1``.
+
The IT8620E and IT8628E are custom designs, hardware monitoring part is similar
to IT8728F. It only supports 16-bit fan mode. Both chips support up to 6 fans.
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 18c682e..bc6ddff 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -952,8 +952,8 @@ config SENSORS_IT87
If you say yes here you get support for ITE IT8705F, IT8712F, IT8716F,
IT8718F, IT8720F, IT8721F, IT8726F, IT8728F, IT8732F, IT8758E,
IT8771E, IT8772E, IT8781F, IT8782F, IT8783E/F, IT8786E, IT8790E,
- IT8603E, IT8620E, IT8623E, IT8628E, and IT8689E sensor chips, and
- the SiS950 clone.
+ IT8603E, IT8607E, IT8620E, IT8623E, IT8628E, and IT8689E sensor chips,
+ and the SiS950 clone.
This driver can also be built as a module. If so, the module
will be called it87.
diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 2757d42..bdef0b7 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -12,6 +12,7 @@
* similar parts. The other devices are supported by different drivers.
*
* Supports: IT8603E Super I/O chip w/LPC interface
+ * IT8607E Super I/O chip w/LPC interface
* IT8620E Super I/O chip w/LPC interface
* IT8622E Super I/O chip w/LPC interface
* IT8623E Super I/O chip w/LPC interface
@@ -66,7 +67,7 @@
enum chips { it87, it8712, it8716, it8718, it8720, it8721, it8728, it8732,
it8771, it8772, it8781, it8782, it8783, it8786, it8790,
- it8792, it8603, it8613, it8620, it8622, it8628, it8689, it87952 };
+ it8792, it8603, it8607, it8613, it8620, it8622, it8628, it8689, it87952 };
static struct platform_device *it87_pdev[2];
@@ -160,6 +161,7 @@ static inline void superio_exit(int ioreg, bool noexit)
#define IT8786E_DEVID 0x8786
#define IT8790E_DEVID 0x8790
#define IT8603E_DEVID 0x8603
+#define IT8607E_DEVID 0x8607
#define IT8613E_DEVID 0x8613
#define IT8620E_DEVID 0x8620
#define IT8622E_DEVID 0x8622
@@ -530,6 +532,14 @@ static const struct it87_devices it87_devices[] = {
.num_temp_map = 6,
.peci_mask = 0x07,
},
+ [it8607] = {
+ .name = "it8607",
+ .model = "IT8607E",
+ .features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
+ | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
+ | FEAT_AVCC3 | FEAT_PWM_FREQ2,
+ .peci_mask = 0x07,
+ },
[it8620] = {
.name = "it8620",
.model = "IT8620E",
@@ -2941,6 +2951,9 @@ static int __init it87_find(int sioaddr, unsigned short *address,
case IT8613E_DEVID:
sio_data->type = it8613;
break;
+ case IT8607E_DEVID:
+ sio_data->type = it8607;
+ break;
case IT8620E_DEVID:
sio_data->type = it8620;
break;
@@ -3095,7 +3108,7 @@ static int __init it87_find(int sioaddr, unsigned short *address,
sio_data->beep_pin = superio_inb(sioaddr,
IT87_SIO_BEEP_PIN_REG) & 0x3f;
- } else if (sio_data->type == it8603) {
+ } else if (sio_data->type == it8603 || sio_data->type == it8607) {
int reg27, reg29;
superio_select(sioaddr, GPIO);
--
2.56.0