Add Gamepad mapping for Samsung EI-GP20

device/gamepad/gamepad_standard_mappings_linux.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "device/gamepad/gamepad_standard_mappings.h"
 
 namespace device {
@@ skipping 272 matching lines @@
   mapped->buttons[BUTTON_INDEX_DPAD_UP] = AxisNegativeAsButton(input.axes[7]);
   mapped->buttons[BUTTON_INDEX_DPAD_DOWN] = AxisPositiveAsButton(input.axes[7]);
   mapped->buttons[BUTTON_INDEX_DPAD_LEFT] = AxisNegativeAsButton(input.axes[6]);
   mapped->buttons[BUTTON_INDEX_DPAD_RIGHT] =
       AxisPositiveAsButton(input.axes[6]);
 
   mapped->buttonsLength = BUTTON_INDEX_COUNT - 1; /* no meta */
   mapped->axesLength = AXIS_INDEX_COUNT;
 }
 
+void MapperSamsung_EI_GP20(const blink::WebGamepad& input,
+                           blink::WebGamepad* mapped) {
+  *mapped = input;
+  mapped->buttons[BUTTON_INDEX_PRIMARY] = input.buttons[0];
+  mapped->buttons[BUTTON_INDEX_SECONDARY] = input.buttons[1];
+  mapped->buttons[BUTTON_INDEX_TERTIARY] = input.buttons[3];

[scottmg, 2016/11/07 17:39:24]

What are buttons[2] and [5]? :)

[j-hyun.lee, 2016/11/08 06:16:20]

There are no H/W buttons [2] and [5] on gamepad EI_GP20. :)
Those index numbers are skipped same as [8] and [9].

+  mapped->buttons[BUTTON_INDEX_QUATERNARY] = input.buttons[4];
+  mapped->buttons[BUTTON_INDEX_LEFT_SHOULDER] = NullButton();
+  mapped->buttons[BUTTON_INDEX_RIGHT_SHOULDER] = NullButton();
+  mapped->buttons[BUTTON_INDEX_LEFT_TRIGGER] = input.buttons[6];
+  mapped->buttons[BUTTON_INDEX_RIGHT_TRIGGER] = input.buttons[7];
+  mapped->buttons[BUTTON_INDEX_BACK_SELECT] = input.buttons[10];
+  mapped->buttons[BUTTON_INDEX_START] = input.buttons[11];
+  mapped->buttons[BUTTON_INDEX_LEFT_THUMBSTICK] = NullButton();
+  mapped->buttons[BUTTON_INDEX_RIGHT_THUMBSTICK] = NullButton();
+
+  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_META] = input.buttons[15];
+  mapped->buttons[BUTTON_INDEX_COUNT] = NullButton();

[scottmg, 2016/11/07 17:39:24]

Don't set INDEX_COUNT, it's for a maximum value.

[j-hyun.lee, 2016/11/08 06:16:20]

Ok, I will fix it.

+
+  mapped->axes[AXIS_INDEX_LEFT_STICK_X] = input.axes[0];
+  mapped->axes[AXIS_INDEX_LEFT_STICK_Y] = input.axes[1];
+  mapped->axes[AXIS_INDEX_RIGHT_STICK_X] = input.axes[2];
+  mapped->axes[AXIS_INDEX_RIGHT_STICK_Y] = input.axes[3];
+
+  mapped->buttonsLength = BUTTON_INDEX_COUNT;
+  mapped->axesLength = AXIS_INDEX_COUNT;
+}
+
 struct MappingData {
   const char* const vendor_id;
   const char* const product_id;
   GamepadStandardMappingFunction function;
 } AvailableMappings[] = {
     // http://www.linux-usb.org/usb.ids
     {"0079", "0006", MapperDragonRiseGeneric},   // DragonRise Generic USB
     {"045e", "028e", MapperXInputStyleGamepad},  // Xbox 360 Wired
     {"045e", "028f", MapperXInputStyleGamepad},  // Xbox 360 Wireless
     {"045e", "0719", MapperXInputStyleGamepad},  // Xbox 360 Wireless
     {"046d", "c21d", MapperXInputStyleGamepad},  // Logitech F310
     {"046d", "c21e", MapperXInputStyleGamepad},  // Logitech F510
     {"046d", "c21f", MapperXInputStyleGamepad},  // Logitech F710
+    {"04e8", "a000", MapperSamsung_EI_GP20},     // Samsung Gamepad EI-GP20
     {"054c", "0268", MapperPlaystationSixAxis},  // Playstation SIXAXIS
     {"054c", "05c4", MapperDualshock4},          // Playstation Dualshock 4
     {"0583", "2060", MapperIBuffalo},            // iBuffalo Classic
     {"0925", "0005", MapperLakeviewResearch},    // SmartJoy PLUS Adapter
     {"0925", "8866", MapperLakeviewResearch},    // WiseGroup MP-8866
     {"0955", "7210", MapperNvShield},            // Nvidia Shield gamepad
     {"0b05", "4500", MapperADT1},                // Nexus Player Controller
     {"0e8f", "0003", MapperXGEAR},           // XFXforce XGEAR PS2 Controller
     {"1532", "0900", MapperRazerServal},     // Razer Serval Controller
     {"18d1", "2c40", MapperADT1},            // ADT-1 Controller
@@ skipping 10 matching lines @@
     const base::StringPiece& product_id) {
   for (size_t i = 0; i < arraysize(AvailableMappings); ++i) {
     MappingData& item = AvailableMappings[i];
     if (vendor_id == item.vendor_id && product_id == item.product_id)
       return item.function;
   }
   return NULL;
 }
 
 }  // namespace device