kernel/linux.git/Documentation/hwmon, branch v5.15.208

hwmon: (adm1177) fix sysfs ABI violation and current unit conversion

2026-04-18T08:33:26+00:00

[ Upstream commit bf08749a6abb6d1959bfdc0edc32c640df407558 ] The adm1177 driver exposes the current alert threshold through hwmon_curr_max_alarm. This violates the hwmon sysfs ABI, where *_alarm attributes are read-only status flags and writable thresholds must use currN_max. The driver also stores the threshold internally in microamps, while currN_max is defined in milliamps. Convert the threshold accordingly on both the read and write paths. Widen the cached threshold and related calculations to 64 bits so that small shunt resistor values do not cause truncation or overflow. Also use 64-bit arithmetic for the mA/uA conversions, clamp writes to the range the hardware can represent, and propagate failures from adm1177_write_alert_thr() instead of silently ignoring them. Update the hwmon documentation to reflect the attribute rename and the correct units returned by the driver. Fixes: 09b08ac9e8d5 ("hwmon: (adm1177) Add ADM1177 Hot Swap Controller and Digital Power Monitor driver") Signed-off-by: Sanman Pradhan Acked-by: Nuno Sá Link: https://lore.kernel.org/r/20260325051246.28262-1-sanman.pradhan@hpe.com Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin

hwmon: (ftsteutates) Fix scaling of measurements

2023-03-10T08:39:21+00:00

[ Upstream commit ca8fd8c16a8b77dfcf7f6ce52d2c863220693a78 ] A user complained that the ftsteutates driver was displaying bogus values since its introduction. This happens because the sensor measurements need to be scaled in order to produce meaningful results: - the fan speed needs to be multiplied by 60 since its in RPS - the temperature is in degrees celsius and needs an offset of 64 - the voltage is in 1/256 of 3.3V The offical datasheet says the voltage needs to be divided by 256, but this is likely an off-by-one-error, since even the BIOS devides by 255 (otherwise 3.3V could not be measured). The voltage channels additionally need a board-specific multiplier, however this can be done by the driver since its board-specific. The reason the missing scaling of measurements is the way Fujitsu used this driver when it was still out-of-tree. Back then, all scaling was done in userspace by libsensors, even the generic one. Tested on a Fujitsu DS3401-B1. Fixes: 08426eda58e0 ("hwmon: Add driver for FTS BMC chip "Teutates"") Signed-off-by: Armin Wolf Link: https://lore.kernel.org/r/20221224041855.83981-2-W_Armin@gmx.de Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin

hwmon: (lm90) Add basic support for TI TMP461

2021-12-29T11:28:48+00:00

[ Upstream commit f8344f7693a25d9025a59d164450b50c6f5aa3c0 ] TMP461 is almost identical to TMP451 and was actually detected as TMP451 with the existing lm90 driver if its I2C address is 0x4c. Add support for it to the lm90 driver. At the same time, improve the chip detection function to at least try to distinguish between TMP451 and TMP461. As a side effect, this fixes commit 24333ac26d01 ("hwmon: (tmp401) use smb word operations instead of 2 smb byte operations"). TMP461 does not support word operations on temperature registers, which causes bad temperature readings with the tmp401 driver. The lm90 driver does not perform word operations on temperature registers and thus does not have this problem. Support is listed as basic because TMP461 supports a sensor resolution of 0.0625 degrees C, while the lm90 driver assumes a resolution of 0.125 degrees C. Also, the TMP461 supports negative temperatures with its default temperature range, which is not the case for similar chips supported by the lm90 and the tmp401 drivers. Those limitations will be addressed with follow-up patches. Fixes: 24333ac26d01 ("hwmon: (tmp401) use smb word operations instead of 2 smb byte operations") Reported-by: David T. Wilson Cc: David T. Wilson Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin

hwmon: (k10temp) Remove residues of current and voltage

2021-09-13T00:56:36+00:00

Commit id "b00647c46c9d7f6ee1ff6aaf335906101755e614", adds reporting current and voltage to k10temp.c The commit id "0a4e668b5d52eed8026f5d717196b02b55fb2dc6", removed reporting current and voltage from k10temp.c The curr and in(voltage) entries are not removed from "k10temp_info" structure. Removing those residue entries. while at it, update k10temp driver documentation Signed-off-by: suma hegde Cc: Guenter Roeck Link: https://lore.kernel.org/r/20210902174155.7365-2-nchatrad@amd.com Signed-off-by: Guenter Roeck

hwmon: add driver for Aquacomputer D5 Next

2021-08-28T15:53:30+00:00

This driver exposes hardware sensors of the Aquacomputer D5 Next watercooling pump, which communicates through a proprietary USB HID protocol. Available sensors are pump and fan speed, power, voltage and current, as well as coolant temperature. Also available through debugfs are the serial number, firmware version and power-on count. Attaching a fan is optional and allows it to be controlled using temperature curves directly from the pump. If it's not connected, the fan-related sensors will report zeroes. The pump can be configured either through software or via its physical interface. Configuring the pump through this driver is not implemented, as it seems to require sending it a complete configuration. That includes addressable RGB LEDs, for which there is no standard sysfs interface. Thus, that task is better suited for userspace tools. This driver has been tested on x86_64, both in-kernel and as a module. Signed-off-by: Aleksa Savic Signed-off-by: Guenter Roeck

hwmon: (sbrmi) Add Documentation

2021-08-17T21:54:25+00:00

- Add documentation for SB-RMI module Reviewed-by: Guenter Roeck Signed-off-by: Akshay Gupta Signed-off-by: Naveen Krishna Chatradhi Link: https://lore.kernel.org/r/20210726133615.9709-2-nchatrad@amd.com Signed-off-by: Guenter Roeck

dt-bindings: firmware: update arm,scpi.yaml reference

2021-08-17T21:54:25+00:00

Changeset 1496be719468 ("dt-bindings: firmware: arm,scpi: Convert to json schema") renamed: Documentation/devicetree/bindings/arm/arm,scpi.txt to: Documentation/devicetree/bindings/firmware/arm,scpi.yaml. Update its cross-reference accordingly. Fixes: 1496be719468 ("dt-bindings: firmware: arm,scpi: Convert to json schema") Signed-off-by: Mauro Carvalho Chehab Acked-by: Sudeep Holla Link: https://lore.kernel.org/r/b5a2b0cb83e7f8193b4be4cef9250dd4c42877ab.1626947923.git.mchehab+huawei@kernel.org Signed-off-by: Guenter Roeck

hwmon: sht4x: update Documentation for Malformed table

2021-08-17T21:54:14+00:00

Make top and bottom border lines match. Documentation/hwmon/sht4x.rst:42: WARNING: Malformed table. Text in column margin in table line 4. Fixes: 505c2549373f ("hwmon: Add sht4x Temperature and Humidity Sensor Driver") Signed-off-by: Randy Dunlap Cc: Navin Sankar Velliangiri Cc: Guenter Roeck Cc: Jean Delvare Cc: linux-hwmon@vger.kernel.org Link: https://lore.kernel.org/r/20210727232054.7426-1-rdunlap@infradead.org Signed-off-by: Guenter Roeck

hwmon: (pmbus) Add driver for Delta DPS-920AB PSU

2021-06-17T11:21:46+00:00

This adds support for the Delta DPS-920AB PSU. Only missing feature is fan control which the PSU supports. Signed-off-by: Robert Marko Link: https://lore.kernel.org/r/20210607103431.2039073-1-robert.marko@sartura.hr [groeck: Add MODULE_IMPORT_NS(PMBUS);] Signed-off-by: Guenter Roeck

hwmon: (pmbus/pim4328) Add documentation for the pim4328 PMBus driver

2021-06-17T11:21:46+00:00

Add documentation and index link for pim4328 PMBus driver. Signed-off-by: Erik Rosen Signed-off-by: Guenter Roeck