Kernel driver i2c-i801¶
- Supported adapters:
Datasheets: Publicly available at the Intel website
- Intel 82801AA and 82801AB (ICH and ICH0 - part of the ‘810’ and ‘810E’ chipsets)
- Intel 82801BA (ICH2 - part of the ‘815E’ chipset)
- Intel 82801CA/CAM (ICH3)
- Intel 82801DB (ICH4) (HW PEC supported)
- Intel 82801EB/ER (ICH5) (HW PEC supported)
- Intel 6300ESB
- Intel 82801FB/FR/FW/FRW (ICH6)
- Intel 82801G (ICH7)
- Intel 631xESB/632xESB (ESB2)
- Intel 82801H (ICH8)
- Intel 82801I (ICH9)
- Intel EP80579 (Tolapai)
- Intel 82801JI (ICH10)
- Intel 5/3400 Series (PCH)
- Intel 6 Series (PCH)
- Intel Patsburg (PCH)
- Intel DH89xxCC (PCH)
- Intel Panther Point (PCH)
- Intel Lynx Point (PCH)
- Intel Avoton (SOC)
- Intel Wellsburg (PCH)
- Intel Coleto Creek (PCH)
- Intel Wildcat Point (PCH)
- Intel BayTrail (SOC)
- Intel Braswell (SOC)
- Intel Sunrise Point (PCH)
- Intel Kaby Lake (PCH)
- Intel DNV (SOC)
- Intel Broxton (SOC)
- Intel Lewisburg (PCH)
- Intel Gemini Lake (SOC)
- Intel Cannon Lake (PCH)
- Intel Cedar Fork (PCH)
- Intel Ice Lake (PCH)
- Intel Comet Lake (PCH)
- Intel Elkhart Lake (PCH)
- Intel Tiger Lake (PCH)
On Intel Patsburg and later chipsets, both the normal host SMBus controller and the additional ‘Integrated Device Function’ controllers are supported.
- disable_features (bit vector)
Disable selected features normally supported by the device. This makes it possible to work around possible driver or hardware bugs if the feature in question doesn’t work as intended for whatever reason. Bit values:
0x01 disable SMBus PEC 0x02 disable the block buffer 0x08 disable the I2C block read functionality 0x10 don’t use interrupts 0x20 disable SMBus Host Notify
The ICH (properly known as the 82801AA), ICH0 (82801AB), ICH2 (82801BA), ICH3 (82801CA/CAM) and later devices (PCH) are Intel chips that are a part of Intel’s ‘810’ chipset for Celeron-based PCs, ‘810E’ chipset for Pentium-based PCs, ‘815E’ chipset, and others.
The ICH chips contain at least SEVEN separate PCI functions in TWO logical PCI devices. An output of lspci will show something similar to the following:
00:1e.0 PCI bridge: Intel Corporation: Unknown device 2418 (rev 01) 00:1f.0 ISA bridge: Intel Corporation: Unknown device 2410 (rev 01) 00:1f.1 IDE interface: Intel Corporation: Unknown device 2411 (rev 01) 00:1f.2 USB Controller: Intel Corporation: Unknown device 2412 (rev 01) 00:1f.3 Unknown class [0c05]: Intel Corporation: Unknown device 2413 (rev 01)
The SMBus controller is function 3 in device 1f. Class 0c05 is SMBus Serial Controller.
The ICH chips are quite similar to Intel’s PIIX4 chip, at least in the SMBus controller.
Process Call Support¶
Block process call is supported on the 82801EB (ICH5) and later chips.
I2C Block Read Support¶
I2C block read is supported on the 82801EB (ICH5) and later chips.
SMBus 2.0 Support¶
The 82801DB (ICH4) and later chips support several SMBus 2.0 features.
PCI interrupt support is supported on the 82801EB (ICH5) and later chips.