Gui-Dong Han [Fri, 28 Nov 2025 12:38:16 +0000 (20:38 +0800)]
hwmon: (w83l786ng) Convert macros to functions to avoid TOCTOU
The macros FAN_FROM_REG and TEMP_FROM_REG evaluate their arguments
multiple times. When used in lockless contexts involving shared driver
data, this causes Time-of-Check to Time-of-Use (TOCTOU) race
conditions.
Convert the macros to static functions. This guarantees that arguments
are evaluated only once (pass-by-value), preventing the race
conditions.
Adhere to the principle of minimal changes by only converting macros
that evaluate arguments multiple times and are used in lockless
contexts.
Juergen Gross [Wed, 26 Nov 2025 16:20:16 +0000 (17:20 +0100)]
hwmon/w83781d: Drop REALLY_SLOW_IO setting
In w83781d_isa_found() there is REALLY_SLOW_IO defined around some port
accesses, probably in order to wait between multiple accesses.
Unfortunately this isn't making any difference compared to not having
this define since more than a decade, as REALLY_SLOW_IO needs to be
defined while "#include <asm/io.h>" is called to have an effect.
As there seem not to be any outstanding issues in spite of this having
no effect, just drop the "#define" and add a remark to the related
comment.
Juergen Gross [Wed, 26 Nov 2025 16:20:15 +0000 (17:20 +0100)]
hwmon/lm78: Drop REALLY_SLOW_IO setting
In lm78_isa_found() there is REALLY_SLOW_IO defined around some port
accesses, probably in order to wait between multiple accesses.
Unfortunately this isn't making any difference compared to not having
this define since more than a decade, as REALLY_SLOW_IO needs to be
defined while "#include <asm/io.h>" is called to have an effect.
As there seem not to be any outstanding issues in spite of this having
no effect, just drop the "#define" and add a remark to the related
comment.
Haotian Zhang [Wed, 26 Nov 2025 16:26:02 +0000 (00:26 +0800)]
hwmon: sy7636a: Fix regulator_enable resource leak on error path
In sy7636a_sensor_probe(), regulator_enable() is called but if
devm_hwmon_device_register_with_info() fails, the function returns
without calling regulator_disable(), leaving the regulator enabled
and leaking the reference count.
Switch to devm_regulator_get_enable() to automatically
manage the regulator resource.
Gui-Dong Han [Wed, 26 Nov 2025 11:38:28 +0000 (19:38 +0800)]
hwmon: (adm1026) Convert macros to functions to avoid TOCTOU
The macro FAN_FROM_REG evaluates its arguments multiple times. When used
in lockless contexts involving shared driver data, this causes
Time-of-Check to Time-of-Use (TOCTOU) race conditions.
Convert the macro to a static function. This guarantees that arguments
are evaluated only once (pass-by-value), preventing the race
conditions.
Adhere to the principle of minimal changes by only converting macros
that evaluate arguments multiple times and are used in lockless
contexts.
Gui-Dong Han [Wed, 26 Nov 2025 11:40:46 +0000 (19:40 +0800)]
hwmon: (adm1029) Add locking to avoid TOCTOU
The function fan_show checks shared data for zero or invalid values
before using it as a divisor. These accesses are currently lockless. If
the data changes to zero between the check and the division, it causes a
divide-by-zero error.
Explicitly acquire the update lock around these checks and calculations
to ensure the data remains stable, preventing Time-of-Check to
Time-of-Use (TOCTOU) race conditions.
Gui-Dong Han [Wed, 26 Nov 2025 11:35:42 +0000 (19:35 +0800)]
hwmon: (lm87) Convert macros to functions to avoid TOCTOU
The macro FAN_FROM_REG evaluates its arguments multiple times. When used
in lockless contexts involving shared driver data, this causes
Time-of-Check to Time-of-Use (TOCTOU) race conditions.
Convert the macro to a static function. This guarantees that arguments
are evaluated only once (pass-by-value), preventing the race
conditions.
Adhere to the principle of minimal changes by only converting macros
that evaluate arguments multiple times and are used in lockless
contexts.
Gui-Dong Han [Mon, 24 Nov 2025 16:59:00 +0000 (00:59 +0800)]
hwmon: (vt8231) Convert macros to functions to avoid TOCTOU
The macro FAN_FROM_REG evaluates its arguments multiple times. When used
with shared driver data, this leads to Time-of-Check to Time-of-Use
(TOCTOU) race conditions, potentially causing divide-by-zero errors.
Convert the macro to a static function to ensure arguments are evaluated
only once.
Additionally, in fan_div_store, move the reading of the old register
value and the calculation of the minimum limit inside the update lock.
This ensures that the read-modify-write sequence operates on consistent
data, preventing race conditions during fan divider updates.
Gui-Dong Han [Mon, 24 Nov 2025 16:55:08 +0000 (00:55 +0800)]
hwmon: (emc2103) Add locking to avoid TOCTOU
The functions fan1_input_show and fan1_target_show check shared data for
zero before using it as a divisor. These accesses are currently
lockless. If the data changes to zero between the check and the
division, it causes a divide-by-zero error.
Explicitly acquire the update lock around these checks and calculations
to ensure the data remains stable, preventing Time-of-Check to
Time-of-Use (TOCTOU) race conditions.
Billy Tsai [Thu, 20 Nov 2025 11:12:31 +0000 (19:12 +0800)]
dt-bindings: hwmon: Add AST2700 compatible
Adds support for the AST2700 PWM/Tach controller by extending the
compatible string enumeration in the device tree binding.
The AST2700 PWM/Tach hardware is compatible with the existing binding
schema and requires no additional properties or modifications beyond
the new compatible string.
Gui-Dong Han [Thu, 20 Nov 2025 04:13:31 +0000 (12:13 +0800)]
hwmon: (vt1211) Convert macros to functions to avoid TOCTOU
The macros IN_FROM_REG, TEMP_FROM_REG, and RPM_FROM_REG evaluate their
arguments multiple times. These macros are used in lockless show functions
involving shared driver data, leading to Time-of-Check to Time-of-Use race
conditions.
For example, RPM_FROM_REG checks if a value is 0 or 255, and then uses it
in a division. If the value is modified by another thread to 0 after the
check but before the division, it causes a divide-by-zero error.
Convert these macros to static functions. This guarantees that arguments
are evaluated only once (pass-by-value), fixing the race conditions.
Adhere to the principle of minimal changes by only converting the specific
macros involved in these lockless contexts.
James Calligeros [Wed, 12 Nov 2025 11:16:52 +0000 (21:16 +1000)]
hwmon: Add Apple Silicon SMC hwmon driver
The System Management Controller on Apple Silicon devices is responsible
for integrating and exposing the data reported by the vast array of
hardware monitoring sensors present on these devices. It is also
responsible for fan control, and allows users to manually set fan
speeds if they so desire. Add a hwmon driver to expose current,
power, temperature, and voltage monitoring sensors, as well as
fan speed monitoring and control via the SMC on Apple Silicon devices.
The SMC firmware has no consistency between devices, even when they
share an SoC. The FourCC keys used to access sensors are almost
random. An M1 Mac mini will have different FourCCs for its CPU core
temperature sensors to an M1 MacBook Pro, for example. For this
reason, the valid sensors for a given device are specified in a
child of the SMC Devicetree node. The driver uses this information
to determine which sensors to make available at runtime.
Reviewed-by: Neal Gompa <neal@gompa.dev> Acked-by: Guenter Roeck <linux@roeck-us.net> Co-developed-by: Janne Grunau <j@jannau.net> Signed-off-by: Janne Grunau <j@jannau.net> Signed-off-by: James Calligeros <jcalligeros99@gmail.com> Link: https://lore.kernel.org/r/20251112-macsmc-subdevs-v5-6-728e4b91fe81@gmail.com
[groeck: Added Documentation to index] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Bruno Thomsen [Tue, 11 Nov 2025 14:44:05 +0000 (15:44 +0100)]
hwmon: (tmp421) Check error when loading label from dt
Add error checking when loading temperature channel label defined
in device tree. Handling of error from of_property_read_string()
is inspired by lm90 driver and therefor contain same error string.
Jeff Lin [Thu, 6 Nov 2025 10:45:19 +0000 (18:45 +0800)]
hwmon/pmbus: (isl68137) Add support for raa229141
The RAA229141A is a digital dual output multiphase (X+Y ≤ 12) PWM
controller designed to be compliant with Intel VR13, VR13.HC, VR14 and
VR14.Cloud specifications, targeting VCORE and auxiliary rails.
The RAA229141A supports the Intel SVID interface along with PMBus V1.3
specifications, making it ideal for controlling the microprocessor core and
system rails in Intel VR13, VR13.HC, VR14 and VR14.Cloud platforms.
Add a driver for the ST Microelectronics TSC1641 16-bit high-precision
power monitor. The driver supports reading bus voltage, current, power,
and temperature. Sysfs attributes are exposed for shunt resistor and
update interval. The driver integrates with the hwmon subsystem and
supports optional ALERT pin polarity configuration.
James Calligeros [Sat, 25 Oct 2025 00:24:36 +0000 (10:24 +1000)]
mfd: macsmc: Add new __SMC_KEY macro
When using the _SMC_KEY macro in switch/case statements, GCC 15.2.1 errors
out with 'case label does not reduce to an integer constant'. Introduce
a new __SMC_KEY macro that can be used instead.
Akhilesh Patil [Sun, 2 Nov 2025 09:43:20 +0000 (15:13 +0530)]
hwmon: (aht10) Add support for dht20
Add support for dht20 temperature and humidity sensor from Aosong.
Modify aht10 driver to handle different init command for dht20 sensor by
adding init_cmd entry in the driver data. dht20 sensor is compatible with
aht10 hwmon driver with this change.
Tested on TI am62x SK board with dht20 sensor connected at i2c-2 port.
The driver does not perform any locking, does not execute or use any sleep
related functionality, and does not allocate memory. Drop the unnecessary
include files.
hwmon: (i5500_temp) Drop unnecessary include files
The driver does not perform any locking, does not execute or use any sleep
related functionality, and does not allocate memory. Drop the unnecessary
include files.
Ankan Biswas [Thu, 16 Oct 2025 10:30:47 +0000 (16:00 +0530)]
docs/hwmon: Fix broken links warnings in lm90.rst
This patch fixes warnings in Documentation/hwmon/lm90.rst reported when
running 'make linkcheckdocs'.
On 2011-09-23 National Semiconductors became part of Texas Instruments
and national.com is no longer accessible. The datasheet resources for
the chips are now available at Texas Instruments website and have been
updated for lm90.
In 2021, Maxim Integrated was acquired by Analog Devices and maxim-ic.com
redirects to analog.com. The chip datasheets are now available at
Analog Devices and have been updated accordingly.
Some additional broken or unavailable links have been replaced with
equivalents hosted by DigiKey.
Nuno Sá [Wed, 15 Oct 2025 14:52:21 +0000 (15:52 +0100)]
hwmon: (adt7410): Support adt7422 chip
Add support for the ADT7422 high accuracy digital temperature sensor. It's
identical to the other chips supported in the driver so we just need to
add it to the ID tables.
Marek Vasut [Wed, 15 Oct 2025 11:49:28 +0000 (13:49 +0200)]
hwmon: (scmi) Enable sensors to assure they can be read
The SCMI specification states that SENSOR_CONFIG_SET is used to
enable/disable the sensors. The sensors can be disabled by default,
which is the case at least on NXP i.MX95. Explicitly trigger the
SENSOR_CONFIG_SET to enable the sensors, otherwise sensor read may
fail and won't return valid data.
Ivan Mikhaylov [Mon, 6 Oct 2025 21:53:19 +0000 (00:53 +0300)]
peci: cpu: add Intel Emerald Rapids support
Add support for detection of Intel Emerald Rapids processor based on
CPU model.
Emerald Rapids Xeon processors with the model set to
INTEL_EMERALDRAPIDS_X. The data field for this entry is "emr".
Tested the patch series with AST2600 BMC with 5S Intel Emerald Rapids
processors & verified by reading cpu & dimm temperature which matches
host sensor values from lmsensors.
ADPM12200 is a quarter brick DC/DC Power Module. It is a high power
non-isolated converter capable of delivering regulated 12V with
continuous power level of 2000W. Uses PMBus.
projects / thirdparty / kernel / linux.git / log
