hardware/Atreus: Add support for all Atreus variants

Make it possible to use the plugin for all known Atreus variants: the post-2016
PCB with A* and the FalbaTech handwired one with a Teensy (these two were the
only supported ones until now), the pre-2016 PCB with A*, and the legacy Teensy2
variant.

Fixes #430.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

doc/plugin/Hardware-Technomancy-Atreus.md

@@ -1,10 +1,18 @@
 # Kaleidoscope-Hardware-Technomancy-Atreus
 
 This is a plugin for [Kaleidoscope][fw], that adds hardware support for the
-[Atreus][atreus]. Supported models include post-2016 PCB variants with an A*
-MCU, and the hand-wired variant from [FalbaTech][falba] with a Teensy2.
+[Atreus][atreus]. Supports both the pre- and post-2016 variants with an A* MCU,
+the hand-wired variant from [FalbaTech][falba] with a Teensy2, and the legacy
+teensy2 variant too.
 
-PCBs prior to 2016, and the legacy teensy2 variants are not supported.
+To select which one to build for, you can either use the Arduino IDE, and select
+the appropriate Pinout and CPU, or, if using `kaleidoscope-builder`, you can add
+a `LOCAL_CFLAGS` setting to `.kaleidoscope-builder.conf`.
+
+For the post-2016 variant (the default, also used by the handwired variant from
+FalbaTech), if you want to explicitly select it, add
+`-DKALEIDOSCOPE_HARDWARE_ATREUS_PINOUT_ASTAR=1`. For the pre-2016 variant, add
+`-DKALEIDOSCOPE_HARDWARE_ATREUS_PINOUT_ASTAR_DOWN`. For the legacy teensy2 variant, add `-DKALEIDOSCOPE_HARDWARE_ATREUS_PINOUT_LEGACY_TEENSY2=1`.
 
  [fw]: https://github.com/keyboardio/Kaleidoscope
  [atreus]: https://atreus.technomancy.us/

src/Kaleidoscope-Hardware-Technomancy-Atreus.h

@@ -19,4 +19,11 @@
 #pragma once
 
 #define KALEIDOSCOPE_WITH_ATMEGA_KEYBOARD 1
+
+#if !defined(KALEIDOSCOPE_HARDWARE_ATREUS_PINOUT_ASTAR) && \
+  !defined(KALEIDOSCOPE_HARDWARE_ATREUS_PINOUT_ASTAR_DOWN) && \
+  !defined(KALEIDOSCOPE_HARDWARE_ATREUS_PINOUT_LEGACY_TEENSY2)
+#define KALEIDOSCOPE_HARDWARE_ATREUS_PINOUT_ASTAR 1
+#endif
+
 #include "kaleidoscope/hardware/technomancy/Atreus.h"

src/kaleidoscope/hardware/technomancy/Atreus.h

@@ -42,10 +42,27 @@ class Atreus: public kaleidoscope::hardware::ATMegaKeyboard {
  public:
   Atreus(void) {}
 
+#ifdef KALEIDOSCOPE_HARDWARE_ATREUS_PINOUT_ASTAR
   ATMEGA_KEYBOARD_CONFIG(
     ROW_PIN_LIST({PIN_D0, PIN_D1, PIN_D3, PIN_D2}),
     COL_PIN_LIST({PIN_D7, PIN_C6, PIN_B5, PIN_B4, PIN_E6, PIN_D4, PIN_B6, PIN_F6, PIN_F7, PIN_D6, PIN_B7})
   );
+#endif
+
+#ifdef KALEIDOSCOPE_HARDWARE_ATREUS_PINOUT_ASTAR_DOWN
+  ATMEGA_KEYBOARD_CONFIG(
+    ROW_PIN_LIST({PIN_D0, PIN_D1, PIN_D3, PIN_D2}),
+    COL_PIN_LIST({PIN_B7, PIN_D6, PIN_F7, PIN_F6, PIN_B6, PIN_D4, PIN_E6, PIN_B4, PIN_B5, PIN_C6, PIN_D7})
+  );
+#endif
+
+#ifdef KALEIDOSCOPE_HARDWARE_ATREUS_PINOUT_LEGACY_TEENSY2
+  ATMEGA_KEYBOARD_CONFIG(
+    ROW_PIN_LIST({PIN_D0, PIN_D1, PIN_D2, PIN_D3}),
+    COL_PIN_LIST({PIN_F6, PIN_F5, PIN_F4, PIN_B7, PIN_B6, PIN_B5, PIN_B4, PIN_B3, PIN_B2, PIN_B1, PIN_B0})
+  );
+  )
+#endif
 
   static constexpr int8_t led_count = 0;