#+title: PineTab2
#+setupfile: ../headers

* PineTab2
A few tweaks are specific to my PineTab2 tablet: getting a serial
console working at boot, exposing its sensors, and making it easy to
find on whatever network it’s connected to. Here’s the skeleton of the
=nixos.pinetab2= module.
#+begin_src nix :tangle yes
{
  flake.modules.nixos.pinetab2 = {
    <<kernel-params>>
    <<sensors>>
    <<avahi>>
  };
}
#+end_src

** Serial Console
These kernel parameters get me a working serial console on the
tablet’s UART at boot, and point the kernel at the SD card’s root
filesystem by label rather than by a device path that can shift
around.
#+name: kernel-params
#+begin_src nix
boot.kernelParams = ["console=tty0" "console=ttyS2,1500000n8" "rootwait" "root=LABEL=NIXOS_SD" "rw"];
#+end_src

** Sensors
Turning on the IIO (Industrial I/O) subsystem exposes the tablet’s
accelerometer and ambient light sensor, which is what lets things like
auto-rotate work.
#+name: sensors
#+begin_src nix
hardware.sensor.iio.enable = true;
#+end_src

** Finding It on the Network
The tablet moves between networks a lot, so Avahi lets me reach it by
its =.local= hostname over mDNS instead of having to look up whatever IP
it was handed.
#+name: avahi
#+begin_src nix
services.avahi = {
  enable = true;
  openFirewall = true;
};
#+end_src