services: Add fancontrol-service-type.issue-70845

Hi! I've created a fancontrol service for my own use on a KGPE-D16
workstation, and wanted to share it with GNU Guix. The configuration
has to be generated upstream with pwmconfig (lm-sensors package)
and you just have to tell the service where it is for it to work.

This is the second version of this patch, fixing the lack of copyright
notice and dot at the end of the commit message.

Change-Id: I120e54cbf849eebd088be2a4d0a0113ffcdfcd84
Signed-off-by: Adrien 'neox' Bourmault <neox@gnu.org>

1 files changed, 32 insertions, 1 deletions

diff --git a/gnu/services/pm.scm b/gnu/services/pm.scm
index 3daf484cc1..2196673875 100644
--- a/gnu/services/pm.scm
+++ b/gnu/services/pm.scm
@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
+;;; Copyright © 2024 Adrien 'neox' Bourmault <neox@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -31,7 +32,9 @@
             tlp-configuration
 
             thermald-configuration
-            thermald-service-type))
+            thermald-service-type
+            
+            fancontrol-service-type))
 
 (define (uglify-field-name field-name)
   (let ((str (symbol->string field-name)))
@@ -466,3 +469,31 @@ shutdown on system startup."))
    (default-value (thermald-configuration))
    (description "Run thermald, a CPU frequency scaling service that helps
 prevent overheating.")))
+
+;;;
+;;; fancontrol
+;;;
+;;; This service implements fan control in conjunction with the tools in the
+;;; lm-sensors package (pwmconfig/fancontrol).
+
+(define (fancontrol-shepherd-service config)
+  (shepherd-service
+   (documentation "Run the fancontrol daemon (fancontrol-daemon)." )
+   (provision '(fancontrol))
+   (requirement '(udev user-processes))
+   (start #~(make-forkexec-constructor
+             (list #$(file-append lm-sensors "/sbin/fancontrol")
+                   #$config)
+             #:user "root" #:group "root"
+             #:log-file "/var/log/fancontrol.log"))
+   (stop #~(make-kill-destructor))))
+
+(define fancontrol-service-type
+  (service-type
+   (name 'fancontrol)
+   (description
+    "Run fancontrol as a daemon.")
+   (extensions
+    (list (service-extension shepherd-root-service-type
+            (compose list fancontrol-shepherd-service))))))
+