From e0c2bdb80a3118e3401886b5084921ffbd3881ce Mon Sep 17 00:00:00 2001
From: coolneng <akasroua@gmail.com>
Date: Wed, 4 May 2022 19:28:18 +0200
Subject: [PATCH] Enable hardware PWM timers and w1-gpio
---
configuration.nix | 29 +++++++++++++++++++++++++++++
modules/periodic.nix | 17 +++++++++++++----
scripts/SATA-hat.sh | 0
3 files changed, 42 insertions(+), 4 deletions(-)
mode change 100644 => 100755 scripts/SATA-hat.sh
diff --git a/configuration.nix b/configuration.nix
index e21f5ad..c89e671 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -16,13 +16,42 @@ with pkgs;
"iomem=relaxed"
"strict-devmem=0"
];
+
+ # Enable SATA-HAT GPIO features
boot.loader.raspberryPi = {
enable = true;
version = 4;
+ firmwareConfig = ''
+ iomem=relaxed
+ strict-devmem=0
+ dtoverlay=pwm-2chan,pin=12,func=4,pin2=13,func2=4
+ dtoverlay=w1-gpio
+ dtparam=i2c1=on
+ '';
};
environment.systemPackages = [ libraspberrypi htop vim ];
+ # Load PWM hardware timers
+ boot.kernelModules = [ "pwm_bcm2835" "w1-gpio" "w1-therm" ];
+ hardware.deviceTree = {
+ enable = true;
+ filter = "*-rpi-*.dtb";
+ overlays = [
+ {
+ name = "pwm-2chan";
+ dtboFile = "${device-tree_rpi.overlays}/pwm-2chan.dtbo";
+ }
+ {
+ name = "w1-gpio";
+ dtboFile = "${device-tree_rpi.overlays}/w1-gpio.dtbo";
+ }
+ ];
+ };
+
+ # Enable I2C
+ hardware.i2c.enable = true;
+
# Add a swap file
swapDevices = [{
device = "/swapfile";
diff --git a/modules/periodic.nix b/modules/periodic.nix
index 7347c11..eea644d 100644
--- a/modules/periodic.nix
+++ b/modules/periodic.nix
@@ -30,18 +30,27 @@ in {
};
# Enable SATA HAT
- systemd.services.sata-hat = {
+ systemd.services.sata-hat = let
+ overlay-directory =
+ "/boot/nixos/4mamyanz1hlc4wz3c427qjh6rabngwvj-linux-5.10.17-1.20210303-dtbs/overlays/";
+ in {
description = "Enable software support for SATA Hat";
wantedBy = [ "zfs-import.target" ];
script = ''
${pkgs.bash}/bin/bash -c "/etc/nixos/scripts/SATA-hat.sh on"
'';
+ preStart = ''
+ ${pkgs.libraspberrypi}/bin/dtoverlay -d ${overlay-directory} pwm-2chan pin=12 func=4 pin2=13 func2=4
+ ${pkgs.libraspberrypi}/bin/dtoverlay -d ${overlay-directory} w1-gpio
+ '';
+ preStop = ''
+ ${pkgs.libraspberrypi}/bin/dtoverlay -r -d ${overlay-directory} pwm-2chan
+ ${pkgs.libraspberrypi}/bin/dtoverlay -r -d ${overlay-directory} w1-gpio
+ ${pkgs.bash}/bin/bash -c "/etc/nixos/scripts/SATA-hat.sh off"
+ '';
serviceConfig = {
Type = "oneshot";
RemainAfterExit = "yes";
- ExecStop = ''
- ${pkgs.bash}/bin/bash -c "/etc/nixos/scripts/SATA-hat.sh off"
- '';
};
before = [ "zfs-import.target" "zfs-import-vault.service" "umount.target" ];
requires = [ "systemd-udev-settle.service" ];
diff --git a/scripts/SATA-hat.sh b/scripts/SATA-hat.sh
old mode 100644
new mode 100755