kernel/linux.git/drivers/hwmon/it87.c, branch linux-7.1.y

hwmon: (it87) Add support for IT8689E

2026-03-31T02:45:06+00:00

Add support for the ITE IT8689E Super I/O chip. The IT8689E supports newer autopwm, 12mV ADC, 16-bit fans, six fans, six PWM channels, PWM frequency 2, six temperature inputs, AVCC3, temperature offset, and fan on/off control. Give it8689 its own GPIO configuration block in it87_find() rather than sharing the it8620/it8628 block. The shared block reads IT87_SIO_PINX2_REG and either marks IN3 as internal AVCC or skips IN9. Because it8689 declares FEAT_AVCC3, IN9 is already marked as always-internal before the GPIO block is reached; applying the PINX2 check would either create duplicate AVCC labels on IN3 and IN9 or incorrectly skip IN9. Also update Documentation/hwmon/it87.rst and drivers/hwmon/Kconfig to document the newly supported chip. Signed-off-by: Markus Hoffmann Link: https://lore.kernel.org/r/20260322103301.18112-1-markus@thehoffs.at Signed-off-by: Guenter Roeck

hwmon: (it87) Check the it87_lock() return value

2026-02-24T15:31:35+00:00

Return early in it87_resume() if it87_lock() fails instead of ignoring the return value of that function. This patch suppresses a Clang thread-safety warning. Cc: Frank Crawford Cc: Guenter Roeck Cc: Jean Delvare Cc: linux-hwmon@vger.kernel.org Fixes: 376e1a937b30 ("hwmon: (it87) Add calls to smbus_enable/smbus_disable as required") Signed-off-by: Bart Van Assche Link: https://lore.kernel.org/r/20260223220102.2158611-15-bart.vanassche@linux.dev [groeck: Declare 'ret' at the beginning of it87_resume()] Signed-off-by: Guenter Roeck

hwmon: (it87) Remove tests nolonger required

2024-04-30T17:32:14+00:00

Remove DMI tests for boards that are known to have issues with entering configuration mode, as now we are testing the chips directly and no longer need to rely on matching the board. Leave the DMI table in place, for the nVIDIA board, and any future expansions. Signed-off-by: Frank Crawford Link: https://lore.kernel.org/r/20240428060653.2425296-5-frank@crawford.emu.id.au Signed-off-by: Guenter Roeck

hwmon: (it87) Test for chipset before entering configuration mode

2024-04-30T17:32:14+00:00

Major part of the change for the new method to avoid chipset issues. The actual update does the following: 1) Lock the memory, but does not perform a SIO entry (previously it would have performed an SIO entry). 2) Attempt to read the chipID. This should be safe no matter which chip we have. 3) If step (2) fails, then perform SIO entry and retry chipID read. For older chips and on failure it acts similarly to prior to this patch. 4) Set the sio_data->type, similar to previously. 5) If we have not performed an SIO entry, and this is not a chip type with the NOCONF feature, then it will perform an SIO entry at this point. 6) Proceed with setup as prior to this patch. 7) Any following access to the SIO registers will invoke the SIO entry and SIO exit steps unless it is a chip with the NOCONF feature set. This was set up in the previous patches in this patchset. 8) Update to the exit based on if it had performed a SIO entry or not. Signed-off-by: Frank Crawford Link: https://lore.kernel.org/r/20240428060653.2425296-4-frank@crawford.emu.id.au [groeck: s/intialised/initialized/] Signed-off-by: Guenter Roeck

hwmon: (it87) Do not enter configuration mode for some chiptypes

2024-04-30T17:32:14+00:00

Update the configuration mode entry code to allow conditional entry, and apply to all calls. Signed-off-by: Frank Crawford Link: https://lore.kernel.org/r/20240428060653.2425296-3-frank@crawford.emu.id.au Signed-off-by: Guenter Roeck

hwmon: (it87) Rename FEAT_CONF_NOEXIT to FEAT_NOCONF as more descriptive of requirement

2024-04-30T17:32:14+00:00

Rename previous definitions to match the new information that they are preinitialised as enabled and should not receive codes to enter or exit configuration mode. Signed-off-by: Frank Crawford Link: https://lore.kernel.org/r/20240428060653.2425296-2-frank@crawford.emu.id.au Signed-off-by: Guenter Roeck

hwmon: (it87) Add support to detect sensor type AMDTSI

2023-08-21T13:04:29+00:00

Add test for sensor type AMDTSI which is available on certain recent chipsets. Signed-off-by: Frank Crawford Link: https://lore.kernel.org/r/20230707123005.956415-4-frank@crawford.emu.id.au Signed-off-by: Guenter Roeck

hwmon: (it87) Improve temperature reporting support

2023-08-21T13:04:29+00:00

Add test if thermistor sensor type attribute should be visible, i.e. test if the attribute is defined. Signed-off-by: Frank Crawford Link: https://lore.kernel.org/r/20230707123005.956415-3-frank@crawford.emu.id.au [groeck: Dropped unnecessary 'type' variable in it87_temp_is_visible()] Signed-off-by: Guenter Roeck

hwmon: (it87) Split temperature sensor detection to separate function

2023-08-21T13:04:29+00:00

The temperature sensor type will need to be used in multiple places, so split it out into its own function. Signed-off-by: Frank Crawford Link: https://lore.kernel.org/r/20230707123005.956415-2-frank@crawford.emu.id.au [groeck: Dropped unnecessary 'type' variable in show_temp_type()] Signed-off-by: Guenter Roeck

hwmon: (it87) Generalise support for FAN_CTL ON/OFF

2023-06-08T13:44:14+00:00

Support for FAN_CTL ON/OFF is currently disabled only for IT8603E but there are severl chips that don't support the configuration bits to turn off fan control entirely. Generalise this support for any chip. Add feature flag FEAT_FANCTL_ONOFF for chips that support configuration bits for management of fan control off and assign all chips that support the configuration. Signed-off-by: Frank Crawford Link: https://lore.kernel.org/r/20230527094756.3464256-1-frank@crawford.emu.id.au Signed-off-by: Guenter Roeck