94 lines
2.7 KiB
Nix
94 lines
2.7 KiB
Nix
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{ config, lib, ... }:
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let
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cfg = config.hardware.raspberry-pi."4".digi-amp-plus;
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in
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{
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options.hardware = {
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raspberry-pi."4".digi-amp-plus = {
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enable = lib.mkEnableOption ''
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support for the IQaudIO DigiAMP+ Hat.
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'';
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unmuteAmp = lib.mkOption {
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type = lib.types.bool;
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default = false;
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description = lib.mdDoc ''
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"one-shot" unmute when kernel module first loads.
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'';
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};
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autoMuteAmp = lib.mkOption {
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type = lib.types.bool;
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default = true;
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description = lib.mdDoc ''
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Unmute the amp when an ALSA device is opened by a client. Mute, with a five-second delay when the ALSA device is closed.
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(Reopening the device within the five-second close window will cancel mute.)
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'';
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};
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};
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};
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config = lib.mkIf cfg.enable {
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hardware.raspberry-pi."4".apply-overlays-dtmerge.enable = lib.mkDefault true;
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hardware.deviceTree = {
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overlays = [
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# Adapted from to: https://github.com/raspberrypi/linux/blob/3ed6d34d53e94ecbebc64c8fa3d1b6d3c41db8fb/arch/arm/boot/dts/overlays/iqaudio-dacplus-overlay.dts
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# changes:
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# - modified top-level "compatible" field from bcm2835 to bcm2711
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# - s/i2s_clk_producer/i2s/ (name on bcm2711 platform)
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{
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name = "iqaudio-digiampplus-overlay";
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dtsText = ''
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/dts-v1/;
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/plugin/;
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/ {
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compatible = "brcm,bcm2711";
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fragment@0 {
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target = <&i2s>;
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__overlay__ {
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status = "okay";
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};
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};
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fragment@1 {
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target = <&i2c1>;
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__overlay__ {
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#address-cells = <1>;
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#size-cells = <0>;
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status = "okay";
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pcm5122@4c {
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#sound-dai-cells = <0>;
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compatible = "ti,pcm5122";
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reg = <0x4c>;
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AVDD-supply = <&vdd_3v3_reg>;
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DVDD-supply = <&vdd_3v3_reg>;
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CPVDD-supply = <&vdd_3v3_reg>;
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status = "okay";
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};
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};
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};
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fragment@2 {
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target = <&sound>;
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iqaudio_dac: __overlay__ {
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compatible = "iqaudio,iqaudio-dac";
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i2s-controller = <&i2s>;
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mute-gpios = <&gpio 22 0>;
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status = "okay";
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${lib.optionalString cfg.unmuteAmp "iqaudio-dac,unmute-amp;"}
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${lib.optionalString cfg.autoMuteAmp "iqaudio-dac,auto-mute-amp;"}
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};
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};
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};
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'';
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}
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];
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};
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};
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}
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