Merge Storage into Model01

Moved over the primary layer read/write code from KeyboardioFirmware, and
renamed them to `load_primary_layer`/`save_primary_layer`, because they deal
with layers, not keymaps now.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

src/Keyboardio-Hardware-Model01.cpp

@@ -1,5 +1,8 @@
 #include <KeyboardioFirmware.h>
 #include <avr/wdt.h>
+#include <EEPROM.h>
+
+#define EEPROM_LAYER_LOCATION 0
 
 KeyboardioScanner Model01::leftHand(0);
 KeyboardioScanner Model01::rightHand(3);
@@ -170,4 +173,16 @@ void Model01::reboot_bootloader() {
     // happens before the watchdog reboots us
 }
 
+void Model01::save_primary_layer(uint8_t layer) {
+    EEPROM.write(EEPROM_LAYER_LOCATION, layer);
+}
+
+uint8_t Model01::load_primary_layer(uint8_t layer_count) {
+    uint8_t layer =  EEPROM.read(EEPROM_LAYER_LOCATION);
+    if (layer >= layer_count) {
+        return 0; // undefined positions get saved as 255
+    }
+    return 0; //  return keymap;
+}
+
 HARDWARE_IMPLEMENTATION KeyboardHardware;

src/Keyboardio-Hardware-Model01.h

@@ -25,6 +25,9 @@ class Model01 {
     void enable_scanner_power(void);
     void reboot_bootloader();
 
+    uint8_t load_primary_layer(uint8_t layer_count);
+    void save_primary_layer(uint8_t layer);
+
     keydata_t leftHandState;
     keydata_t rightHandState;
     keydata_t previousLeftHandState;