hwmon: add Corsair PSU HID controller driver

The Corsair digital power supplies of the series RMi, HXi and AXi include
a small micro-controller with a lot of sensors attached. The sensors can
be accessed by an USB connector from the outside.

This micro-controller provides the data by a simple proprietary USB HID
protocol. The data consist of temperatures, current and voltage levels,
power usage, uptimes, fan speed and some more. It is also possible to
configure the PSU (fan mode, mono/multi-rail, over current protection).

This driver provides access to the sensors/statistics of the RMi and HXi
series power supplies. It does not support configuring these devices,
because there would be many ways to misconfigure or even damage the PSU.

This patch adds:
- hwmon driver corsair-psu
- hwmon documentation
- updates MAINTAINERS

Signed-off-by: Wilken Gottwalt <wilken.gottwalt@posteo.net>
Link: https://lore.kernel.org/r/20201027131710.GA253280@monster.powergraphx.local
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index a850e4f0e0bd..9d600e0c5584 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -449,6 +449,19 @@ config SENSORS_CORSAIR_CPRO
 	  This driver can also be built as a module. If so, the module
 	  will be called corsair-cpro.
 
+config SENSORS_CORSAIR_PSU
+	tristate "Corsair PSU HID controller"
+	depends on HID
+	help
+	  If you say yes here you get support for Corsair PSUs with a HID
+	  interface.
+	  Currently this driver supports the (RM/HX)550i, (RM/HX)650i,
+	  (RM/HX)750i, (RM/HX)850i, (RM/HX)1000i and HX1200i power supplies
+	  by Corsair.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called corsair-psu.
+
 config SENSORS_DRIVETEMP
 	tristate "Hard disk drives with temperature sensors"
 	depends on SCSI && ATA