Commit bc3e4525 authored by Thomas Weißschuh's avatar Thomas Weißschuh Committed by Tzung-Bi Shih
Browse files

hwmon: add ChromeOS EC driver 



The ChromeOS Embedded Controller exposes fan speed and temperature
readings.
Expose this data through the hwmon subsystem.

The driver is designed to be probed via the cros_ec mfd device.

Signed-off-by: default avatarThomas Weißschuh <linux@weissschuh.net>
Acked-by: default avatarGuenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20240529-cros_ec-hwmon-v4-2-5cdf0c5db50a@weissschuh.net


[tzungbi: Fixed typo in MAINTAINERS: "chros_ec_hwmon" -> "cros_ec_hwmon"]
Signed-off-by: default avatarTzung-Bi Shih <tzungbi@kernel.org>
parent a14a569a

Documentation/hwmon/cros_ec_hwmon.rst

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.. SPDX-License-Identifier: GPL-2.0-or-later



Kernel driver cros_ec_hwmon

===========================



Supported chips:



  * ChromeOS embedded controllers.



    Prefix: 'cros_ec'



    Addresses scanned: -



Author:



  - Thomas Weißschuh <linux@weissschuh.net>



Description

-----------



This driver implements support for hardware monitoring commands exposed by the

ChromeOS embedded controller used in Chromebooks and other devices.



The channel labels exposed via hwmon are retrieved from the EC itself.



Fan and temperature readings are supported.

Documentation/hwmon/index.rst

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@@ -58,6 +58,7 @@ Hardware Monitoring Kernel Drivers 
   coretemp

   corsair-cpro

   corsair-psu

   cros_ec_hwmon

   da9052

   da9055

   dell-smm-hwmon

MAINTAINERS

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@@ -5135,6 +5135,14 @@ S: Maintained 
F:	Documentation/devicetree/bindings/sound/google,cros-ec-codec.yaml

F:	sound/soc/codecs/cros_ec_codec.*









CHROMEOS EC HARDWARE MONITORING









M:	Thomas Weißschuh <thomas@weissschuh.net>









L:	chrome-platform@lists.linux.dev









L:	linux-hwmon@vger.kernel.org









S:	Maintained









F:	Documentation/hwmon/cros_ec_hwmon.rst









F:	drivers/hwmon/cros_ec_hwmon.c

















CHROMEOS EC SUBDRIVERS









M:	Benson Leung <bleung@chromium.org>









R:	Guenter Roeck <groeck@chromium.org>
































drivers/hwmon/Kconfig



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@@ -506,6 +506,17 @@ config SENSORS_CORSAIR_PSU







	  This driver can also be built as a module. If so, the module









	  will be called corsair-psu.



















config SENSORS_CROS_EC









	tristate "ChromeOS Embedded Controller sensors"









	depends on MFD_CROS_EC_DEV









	default MFD_CROS_EC_DEV









	help









	  If you say yes here you get support for ChromeOS Embedded Controller









	  sensors.



















	  This driver can also be built as a module. If so, the module









	  will be called cros_ec_hwmon.



















config SENSORS_DRIVETEMP









	tristate "Hard disk drives with temperature sensors"









	depends on SCSI && ATA
































drivers/hwmon/Makefile



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@@ -64,6 +64,7 @@ obj-$(CONFIG_SENSORS_CHIPCAP2) += chipcap2.o







obj-$(CONFIG_SENSORS_CORETEMP)	+= coretemp.o









obj-$(CONFIG_SENSORS_CORSAIR_CPRO) += corsair-cpro.o









obj-$(CONFIG_SENSORS_CORSAIR_PSU) += corsair-psu.o









obj-$(CONFIG_SENSORS_CROS_EC)	+= cros_ec_hwmon.o









obj-$(CONFIG_SENSORS_DA9052_ADC)+= da9052-hwmon.o









obj-$(CONFIG_SENSORS_DA9055)+= da9055-hwmon.o









obj-$(CONFIG_SENSORS_DELL_SMM)	+= dell-smm-hwmon.o