From 462167cc9355770e7b9322375ab82b005073936b Mon Sep 17 00:00:00 2001
From: Travis Staton <hello@travisstaton.com>
Date: Tue, 20 Feb 2024 12:43:24 -0500
Subject: [PATCH] add udev rules

---
 rpi/default.nix | 53 +++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 47 insertions(+), 6 deletions(-)

diff --git a/rpi/default.nix b/rpi/default.nix
index f1e3087..24d3a45 100644
--- a/rpi/default.nix
+++ b/rpi/default.nix
@@ -202,7 +202,7 @@ in
           # linux kernel.
           kernel = {
             enable = true;
-            value = "u-boot-rpi-arm64.bin";
+            value = if cfg.uboot.enable then "u-boot-rpi-arm64.bin" else "kernel.img";
           };
           arm_64bit = {
             enable = true;
@@ -267,11 +267,52 @@ in
     hardware.enableRedistributableFirmware = true;
 
     services = {
-      udev.extraRules = ''
-        SUBSYSTEM=="dma_heap", GROUP="video", MODE="0660"
-        KERNEL=="gpiomem", GROUP="gpio", MODE="0660"
-        KERNEL=="gpiochip*", GROUP="gpio", MODE="0660"
-      '';
+      udev.extraRules =
+        let shell = "${pkgs.bash}/bin/bash";
+        in ''
+          # https://raw.githubusercontent.com/RPi-Distro/raspberrypi-sys-mods/master/etc.armhf/udev/rules.d/99-com.rules
+          SUBSYSTEM=="input", GROUP="input", MODE="0660"
+          SUBSYSTEM=="i2c-dev", GROUP="i2c", MODE="0660"
+          SUBSYSTEM=="spidev", GROUP="spi", MODE="0660"
+          SUBSYSTEM=="*gpiomem*", GROUP="gpio", MODE="0660"
+          SUBSYSTEM=="rpivid-*", GROUP="video", MODE="0660"
+
+          KERNEL=="vcsm-cma", GROUP="video", MODE="0660"
+          SUBSYSTEM=="dma_heap", GROUP="video", MODE="0660"
+
+          SUBSYSTEM=="gpio", GROUP="gpio", MODE="0660"
+          SUBSYSTEM=="gpio", KERNEL=="gpiochip*", ACTION=="add", PROGRAM="${shell} -c 'chgrp -R gpio /sys/class/gpio && chmod -R g=u /sys/class/gpio'"
+          SUBSYSTEM=="gpio", ACTION=="add", PROGRAM="${shell} -c 'chgrp -R gpio /sys%p && chmod -R g=u /sys%p'"
+
+          # PWM export results in a "change" action on the pwmchip device (not "add" of a new device), so match actions other than "remove".
+          SUBSYSTEM=="pwm", ACTION!="remove", PROGRAM="${shell} -c 'chgrp -R gpio /sys%p && chmod -R g=u /sys%p'"
+
+          KERNEL=="ttyAMA[0-9]*|ttyS[0-9]*", PROGRAM="${shell} -c '\
+                  ALIASES=/proc/device-tree/aliases; \
+                  TTYNODE=$$(readlink /sys/class/tty/%k/device/of_node | sed 's/base/:/' | cut -d: -f2); \
+                  if [ -e $$ALIASES/bluetooth ] && [ $$TTYNODE/bluetooth = $$(strings $$ALIASES/bluetooth) ]; then \
+                      echo 1; \
+                  elif [ -e $$ALIASES/console ]; then \
+                      if [ $$TTYNODE = $$(strings $$ALIASES/console) ]; then \
+                          echo 0;\
+                      else \
+                          exit 1; \
+                      fi \
+                  elif [ $$TTYNODE = $$(strings $$ALIASES/serial0) ]; then \
+                      echo 0; \
+                  elif [ $$TTYNODE = $$(strings $$ALIASES/serial1) ]; then \
+                      echo 1; \
+                  else \
+                      exit 1; \
+                  fi \
+          '", SYMLINK+="serial%c"
+
+          ACTION=="add", SUBSYSTEM=="vtconsole", KERNEL=="vtcon1", RUN+="${shell} -c '\
+          	if echo RPi-Sense FB | cmp -s /sys/class/graphics/fb0/name; then \
+          		echo 0 > /sys$devpath/bind; \
+          	fi; \
+          '"
+        '';
     };
   };