mirror of
https://github.com/NixOS/nixos-hardware
synced 2024-11-18 17:09:41 +01:00
66 lines
2.2 KiB
Nix
66 lines
2.2 KiB
Nix
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{ config, lib, ... }:
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let
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cfg = config.hardware.raspberry-pi."4".touch-ft5406;
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in
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{
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options.hardware = {
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raspberry-pi."4".touch-ft5406 = {
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enable = lib.mkEnableOption ''
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Enable the touch controller of the official Raspberry Pi touch diplay.
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The overlay is taken from the official Raspberry Pi Linux fork, and
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the `compatible` field is updated to match the target device tree.
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https://github.com/raspberrypi/linux/blob/14b35093ca68bf2c81bbc90aace5007142b40b40/arch/arm/boot/dts/overlays/rpi-ft5406-overlay.dts
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For more information about the touch display, please refer to:
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https://www.raspberrypi.com/documentation/accessories/display.html
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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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# Configure for modesetting in the device tree
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hardware.deviceTree = {
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overlays = [
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# this *should* be equivalent to (which doesn't work):
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# https://github.com/raspberrypi/linux/blob/rpi-5.10.y/arch/arm/boot/dts/overlays/dwc2-overlay.dts
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# but actually it's obtained using
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# dtc -I dtb -O dts ${config.hardware.deviceTree.kernelPackage}/dtbs/overlays/dwc2.dtbo
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# (changes: modified top-level "compatible" field)
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# which is slightly different and works
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{
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name = "rpi-ft5406-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-path = "/soc/firmware";
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__overlay__ {
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ts: touchscreen {
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compatible = "raspberrypi,firmware-ts";
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touchscreen-size-x = <800>;
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touchscreen-size-y = <480>;
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};
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};
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};
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__overrides__ {
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touchscreen-size-x = <&ts>,"touchscreen-size-x:0";
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touchscreen-size-y = <&ts>,"touchscreen-size-y:0";
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touchscreen-inverted-x = <&ts>,"touchscreen-inverted-x?";
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touchscreen-inverted-y = <&ts>,"touchscreen-inverted-y?";
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touchscreen-swapped-x-y = <&ts>,"touchscreen-swapped-x-y?";
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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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