[Mammoth] Add a keyboard library that translates scancode to keycodes.

sys/voyageurs/keyboard/keyboard_driver.cpp

@@ -2,92 +2,6 @@
 
 #include <mammoth/util/debug.h>
 
-namespace {
-
-char ScancodeToChar(uint8_t code) {
-  switch (code) {
-    case 0x02:
-      return '1';
-    case 0x03:
-      return '2';
-    case 0x04:
-      return '3';
-    case 0x05:
-      return '4';
-    case 0x06:
-      return '5';
-    case 0x07:
-      return '6';
-    case 0x08:
-      return '7';
-    case 0x09:
-      return '8';
-    case 0x0A:
-      return '9';
-    case 0x0B:
-      return '0';
-    case 0x10:
-      return 'Q';
-    case 0x11:
-      return 'W';
-    case 0x12:
-      return 'E';
-    case 0x13:
-      return 'R';
-    case 0x14:
-      return 'T';
-    case 0x15:
-      return 'Y';
-    case 0x16:
-      return 'U';
-    case 0x17:
-      return 'I';
-    case 0x18:
-      return 'O';
-    case 0x19:
-      return 'P';
-    case 0x1E:
-      return 'A';
-    case 0x1F:
-      return 'S';
-    case 0x20:
-      return 'D';
-    case 0x21:
-      return 'F';
-    case 0x22:
-      return 'G';
-    case 0x23:
-      return 'H';
-    case 0x24:
-      return 'J';
-    case 0x25:
-      return 'K';
-    case 0x26:
-      return 'L';
-    case 0x2C:
-      return 'Z';
-    case 0x2D:
-      return 'X';
-    case 0x2E:
-      return 'Y';
-    case 0x2F:
-      return 'C';
-    case 0x30:
-      return 'V';
-    case 0x31:
-      return 'B';
-    case 0x32:
-      return 'N';
-    case 0x33:
-      return 'M';
-  }
-
-  dbgln("Unhandled scancode {x}", code);
-  return '\0';
-}
-
-}  // namespace
-
 void InterruptEnter(void* void_keyboard) {
   KeyboardDriver* keyboard = static_cast<KeyboardDriver*>(void_keyboard);
 
@@ -111,10 +25,9 @@ void KeyboardDriver::InterruptLoop() {
     uint64_t num_bytes = 1;
     uint64_t num_caps = 0;
     check(ZPortRecv(irq_cap_, &num_bytes, &scancode, &num_caps, nullptr));
-    dbgln("Scan {x}", scancode);
 
     for (mmth::PortClient& client : listeners_) {
-      client.WriteByte(ScancodeToChar(scancode));
+      client.WriteByte(scancode);
     }
   }
 }