[gamepad] Add mappings for ELECOM pads in "D" mode

This CL adds mappings for the JC-U4013SBK (the wired version) and
JC-U4113SBK (wireless) when they're in "D" (DirectInput) mode.
(https://crrev.com/c/2252469 adds XInput support for the JC-U4113SBK,
and XInput support for the JC-U4013SBK is still to come.)

Bug: chromium:1097173, chromium:1096754, b:159466838, b:159368181
Test: Connect gamepads in "D" mode, load gamepadviewer.com, and check
that pressing buttons and moving axes is correctly reflected on-screen.

Change-Id: I30dae3bd586b5b4ceeccb0a4ae3c02bb8a91447a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2259012
Commit-Queue: Harry Cutts <hcutts@chromium.org>
Reviewed-by: Matt Reynolds <mattreynolds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781466}

device/gamepad/gamepad_id_list.cc

@@ -142,6 +142,7 @@ constexpr struct GamepadInfo {
     // Elecom Co., Ltd
     {0x056e, 0x2003, kXInputTypeNone},
     {0x056e, 0x2004, kXInputTypeXbox360},
+    {0x056e, 0x200f, kXInputTypeNone},
     {0x056e, 0x2010, kXInputTypeNone},
     {0x056e, 0x2013, kXInputTypeXbox360},
     // Nintendo Co., Ltd

device/gamepad/gamepad_id_list.h

@@ -40,6 +40,8 @@ enum class GamepadId : uint32_t {
   kBroadcomProduct8502 = 0x0a5c8502,
   kDragonRiseProduct0006 = 0x00790006,
   kDragonRiseProduct0011 = 0x00790011,
+  kElecomProduct200f = 0x056e200f,
+  kElecomProduct2010 = 0x056e2010,
   kGoogleProduct2c40 = 0x18d12c40,
   kGoogleProduct9400 = 0x18d19400,
   kGreenAsiaProduct0003 = 0x0e8f0003,

device/gamepad/gamepad_standard_mappings_linux.cc

@@ -820,6 +820,33 @@ void MapperHoripadSwitch(const Gamepad& input, Gamepad* mapped) {
   mapped->axes_length = AXIS_INDEX_COUNT;
 }
 
+void MapperElecomWiredDirectInput(const Gamepad& input, Gamepad* mapped) {
+  *mapped = input;
+  mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[2];
+  mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[3];
+  mapped->buttons[BUTTON_INDEX_TERTIARY] = input.buttons[0];
+  mapped->buttons[BUTTON_INDEX_QUATERNARY] = input.buttons[1];
+  mapped->buttons[BUTTON_INDEX_DPAD_UP] = AxisNegativeAsButton(input.axes[5]);
+  mapped->buttons[BUTTON_INDEX_DPAD_DOWN] = AxisPositiveAsButton(input.axes[5]);
+  mapped->buttons[BUTTON_INDEX_DPAD_LEFT] = AxisNegativeAsButton(input.axes[4]);
+  mapped->buttons[BUTTON_INDEX_DPAD_RIGHT] =
+      AxisPositiveAsButton(input.axes[4]);
+  mapped->buttons[BUTTON_INDEX_BACK_SELECT] = input.buttons[10];
+  mapped->buttons[BUTTON_INDEX_START] = input.buttons[11];
+  mapped->buttons[BUTTON_INDEX_LEFT_THUMBSTICK] = input.buttons[8];
+  mapped->buttons[BUTTON_INDEX_RIGHT_THUMBSTICK] = input.buttons[9];
+  mapped->buttons[BUTTON_INDEX_META] = input.buttons[12];
+  mapped->buttons_length = BUTTON_INDEX_COUNT;
+  mapped->axes_length = AXIS_INDEX_COUNT;
+}
+
+void MapperElecomWirelessDirectInput(const Gamepad& input, Gamepad* mapped) {
+  MapperElecomWiredDirectInput(input, mapped);
+
+  mapped->axes[AXIS_INDEX_RIGHT_STICK_X] = input.axes[3];
+  mapped->axes[AXIS_INDEX_RIGHT_STICK_Y] = input.axes[2];
+}
+
 constexpr struct MappingData {
   GamepadId gamepad_id;
   GamepadStandardMappingFunction function;
@@ -906,6 +933,10 @@ constexpr struct MappingData {
     {GamepadId::kPrototypeVendorProduct9401, MapperStadiaControllerOldFirmware},
     // Snakebyte iDroid:con
     {GamepadId::kBroadcomProduct8502, MapperSnakebyteIDroidCon},
+    // Elecom JC-U4013SBK (DirectInput mode)
+    {GamepadId::kElecomProduct200f, MapperElecomWiredDirectInput},
+    // Elecom JC-U4113SBK (DirectInput mode)
+    {GamepadId::kElecomProduct2010, MapperElecomWirelessDirectInput},
 };
 
 }  // namespace