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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages hardware)
+ #:use-module (gnu packages compression)
+ #:use-module (gnu packages glib)
+ #:use-module (gnu packages libusb)
+ #:use-module (gnu packages linux)
+ #:use-module (gnu packages pkg-config)
+ #:use-module (gnu packages xdisorg)
+ #:use-module (gnu packages xorg)
+ #:use-module (guix build-system gnu)
+ #:use-module (guix download)
+ #:use-module ((guix licenses) #:prefix license:)
+ #:use-module (guix packages))
+
+;; This is a module for packages related to physical hardware that don't (yet)
+;; have a more specific home like gps.scm, security-token.scm, &c.
+
+(define-public ddcutil
+ (package
+ (name "ddcutil")
+ (version "0.9.1")
+ (source
+ (origin
+ (method url-fetch)
+ (uri (string-append "https://www.ddcutil.com/tarballs/"
+ name "-" version ".tar.gz"))
+ (sha256
+ (base32 "1b4bm3zhk5vnad6fxf0mn8nrlj3fngifl7nzxgxw0n56hlv7ccv0"))))
+ (build-system gnu-build-system)
+ (native-inputs
+ `(("pkg-config" ,pkg-config)))
+ (inputs
+ `(("eudev" ,eudev)
+ ("glib" ,glib)
+ ("libdrm" ,libdrm) ; enhanced diagnostics
+ ("libusb" ,libusb) ; support USB monitors
+ ("libx11" ,libx11) ; enhanced diagnostics
+ ("libxrandr" ,libxrandr)
+ ("zlib" ,zlib)))
+ (home-page "https://www.ddcutil.com/")
+ (synopsis "Control external monitor settings")
+ (description
+ "ddcutil can query and modify most external monitors' settings, such as
+brightness, colour levels, and input sources. Generally speaking, any setting
+that can be changed by pressing buttons on the monitor can be modified by
+ddcutil.
+
+ddcutil communicates directly with monitors implementing the Monitor Control
+Command Set (@dfn{MCCS}). It usually does so through the the Display Data
+Channel Command Interface (@dfn{DDC/CI}) protocol on the I2C bus, but can also
+communicate over USB as per the USB Monitor Control Class Specification.
+
+One particular use case is in colour profile management. Monitor calibration
+is relative to the monitor colour settings currently in effect, e.g. red gain.
+ddcutil allows colour-related settings to be saved at the time a monitor is
+calibrated, and restored when the calibration is applied.")
+ (license (list license:bsd-3 ; FindDDCUtil.cmake
+ license:gpl2+)))) ; everything else
+
+(define-public msr-tools
+ (package
+ (name "msr-tools")
+ (version "1.3")
+ (source
+ (origin
+ (method url-fetch)
+ (uri (string-append "https://01.org/sites/default/files/downloads/"
+ name "/" name "-" version ".zip"))
+ (sha256
+ (base32 "07hxmddg0l31kjfmaq84ni142lbbvgq6391r8bd79wpm819pnigr"))))
+ (build-system gnu-build-system)
+ (arguments
+ `(#:make-flags
+ (list (string-append "sbindir=" (assoc-ref %outputs "out") "/sbin"))
+ #:phases
+ (modify-phases %standard-phases
+ (delete 'configure) ; no configure script
+ (add-before 'install 'create-output-directory
+ (lambda* (#:key outputs #:allow-other-keys)
+ ;; 'make install' assumes that sbindir exists.
+ (let* ((out (assoc-ref outputs "out"))
+ (sbin (string-append out "/sbin")))
+ (mkdir-p sbin)
+ #t))))
+ #:tests? #f)) ; no test suite
+ (native-inputs
+ `(("unzip" ,unzip)))
+ ;; These registers and the CPUID instruction only exist on (most) x86 chips.
+ (supported-systems (list "i686-linux" "x86_64-linux"))
+ (home-page "https://01.org/msr-tools/")
+ (synopsis "Read and write Model-Specific Registers (@dfn{MSR})")
+ (description
+ "The MSR Tools project provides console utilities to directly access the
+Model-Specific Registers (@dfn{MSR}s) and CPU ID of Intel-compatible processors:
+
+@itemize
+@item @command{cpuid}: show identification and feature information of any CPU
+@item @command{rdmsr}: read MSRs from any CPU or all CPUs
+@item @command{wrmsr}: write to MSRs on any CPU or all CPUs
+@end itemize
+
+These tools can be used to query and modify certain low-level CPU parameters,
+such as the Turbo Boost ratio and Thermal Design Power (@dfn{TDP}) limits.
+
+MSR addresses differ (greatly) between processors, and any such modification can
+be dangerous and may void your CPU or system board's warranty.")
+ (license license:gpl2))) ; cpuid.c is gpl2, {rd,wr}msr.c are gpl2+