From 37378321839ff57aa8288c123daa229ece4a2987 Mon Sep 17 00:00:00 2001
From: makefu <github@syntax-fehler.de>
Date: Sat, 3 Jun 2023 15:37:42 +0200
Subject: [PATCH] ma respeaker: init

---
 2configs/audio/respeaker.nix | 122 +++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 2configs/audio/respeaker.nix

diff --git a/2configs/audio/respeaker.nix b/2configs/audio/respeaker.nix
new file mode 100644
index 0000000..0aaef5d
--- /dev/null
+++ b/2configs/audio/respeaker.nix
@@ -0,0 +1,122 @@
+{ config, lib, pkgs, ... }:
+let
+  seeed-voicecard = (pkgs.callPackage ../../5pkgs/seeed-voicecard { kernel = config.boot.kernelPackages.kernel; });
+in
+{
+  hardware.raspberry-pi."4".i2c1.enable = true;
+  hardware.raspberry-pi."4".audio.enable = true;
+  hardware.raspberry-pi."4".apply-overlays-dtmerge.enable = true;
+  hardware.deviceTree.filter = lib.mkForce "bcm2711-rpi-4-b.dtb";
+
+  security.rtkit.enable = true;
+
+  environment.systemPackages = with pkgs; [
+    alsaUtils
+    i2c-tools
+    ponymix
+  ];
+
+  sound.enable = true;
+  hardware.pulseaudio.enable = lib.mkForce false;
+  services.pipewire = {
+    enable = true;
+    systemWide = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+    pulse.enable = true;
+  };
+
+  services.pipewire.config.pipewire-pulse = {
+    "pulse.properties"."server.address" = [ "unix:native" "tcp:4713" ];
+  };
+
+  sound.extraConfig = ''
+    pcm.!default {
+        type asym
+        playback.pcm "playback"
+        capture.pcm "ac108"
+    }
+
+    pcm.ac108 {
+        type plug
+        slave.pcm "hw:seeed4micvoicec"
+    }
+  '' ;
+
+
+  boot.extraModulePackages = [
+    seeed-voicecard
+  ];
+  boot.initrd.kernelModules = [ 
+    "snd-soc-seeed-voicecard" 
+    "snd-soc-ac108"
+    "i2c-dev" 
+    #"i2c-bcm2708"
+    #"snd-soc-wm8960"
+  ];
+
+  boot.loader.raspberryPi.firmwareConfig = [
+    "dtparam=i2c_arm=on"
+    "dtparam=i2s=on"
+    "dtparam=spi=on"
+    "dtparam=i2c1=on"
+    # dtoverlay=seeeed-8mic-voicecard  not required because we use hardware.deviceTree
+  ];
+  hardware.deviceTree = {
+    enable = true;
+    overlays = [
+      { name = "respeaker-4mic"; dtsFile = "${seeed-voicecard}/lib/dts/seeed-4mic-voicecard-overlay.dts";}
+      { name = "spi"; dtsText = ''
+          /dts-v1/;
+          /plugin/;
+
+          / {
+            compatible = "raspberrypi";
+            fragment@0 {
+              target = <&spi>;
+              __overlay__ {
+                cs-gpios = <&gpio 8 1>, <&gpio 7 1>;
+                status = "okay";
+                pinctrl-names = "default";
+                pinctrl-0 = <&spi0_pins &spi0_cs_pins>;
+                #address-cells = <1>;
+                #size-cells = <0>;
+                spidev@0 {
+                  reg = <0>;	// CE0
+                  spi-max-frequency = <500000>;
+                  compatible = "spidev";
+                };
+
+                spidev@1 {
+                  reg = <1>;	// CE1
+                  spi-max-frequency = <500000>;
+                  compatible = "spidev";
+                };
+              };
+            };
+                  fragment@1 {
+              target = <&alt0>;
+              __overlay__ {
+                // Drop GPIO 7, SPI 8-11
+                brcm,pins = <4 5>;
+              };
+            };
+
+            fragment@2 {
+              target = <&gpio>;
+              __overlay__ {
+                spi0_pins: spi0_pins {
+                  brcm,pins = <9 10 11>;
+                  brcm,function = <4>; // alt0
+                };
+                spi0_cs_pins: spi0_cs_pins {
+                  brcm,pins = <8 7>;
+                  brcm,function = <1>; // out
+                };
+              };
+            };
+          };
+        '';}
+    ];
+  };
+}