Add gamepad data fetcher for Linux

content/browser/gamepad/data_fetcher_mac.mm

Index: content/browser/gamepad/data_fetcher_mac.mm
diff --git a/content/browser/gamepad/data_fetcher_mac.mm b/content/browser/gamepad/data_fetcher_mac.mm
deleted file mode 100644
index b06f01add8acac353d6a10ce37eb9018aae92489..0000000000000000000000000000000000000000
--- a/content/browser/gamepad/data_fetcher_mac.mm
+++ /dev/null
@@ -1,287 +0,0 @@
-// Copyright (c) 2011 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 "content/browser/gamepad/data_fetcher_mac.h"
-
-#include "base/mac/foundation_util.h"
-#include "base/memory/scoped_nsobject.h"
-#include "base/string16.h"
-#include "base/string_util.h"
-#include "base/utf_string_conversions.h"
-
-#include <IOKit/hid/IOHIDKeys.h>
-#import <Foundation/Foundation.h>
-
-namespace content {
-
-namespace {
-
-NSDictionary* DeviceMatching(uint32_t usage_page, uint32_t usage) {
-  return [NSDictionary dictionaryWithObjectsAndKeys:
-      [NSNumber numberWithUnsignedInt:usage_page],
-          base::mac::CFToNSCast(CFSTR(kIOHIDDeviceUsagePageKey)),
-      [NSNumber numberWithUnsignedInt:usage],
-          base::mac::CFToNSCast(CFSTR(kIOHIDDeviceUsageKey)),
-      nil];
-}
-
-float NormalizeAxis(CFIndex value, CFIndex min, CFIndex max) {
-  return (2.f * (value - min) / static_cast<float>(max - min)) - 1.f;
-}
-
-// http://www.usb.org/developers/hidpage
-const uint32_t kGenericDesktopUsagePage = 0x01;
-const uint32_t kButtonUsagePage = 0x09;
-const uint32_t kJoystickUsageNumber = 0x04;
-const uint32_t kGameUsageNumber = 0x05;
-const uint32_t kMultiAxisUsageNumber = 0x08;
-const uint32_t kAxisMinimumUsageNumber = 0x30;
-const uint32_t kAxisMaximumUsageNumber = 0x35;
-
-}  // namespace
-
-GamepadDataFetcherMac::GamepadDataFetcherMac() : enabled_(true) {
-  hid_manager_ref_.reset(IOHIDManagerCreate(kCFAllocatorDefault,
-                                            kIOHIDOptionsTypeNone));
-  if (CFGetTypeID(hid_manager_ref_) != IOHIDManagerGetTypeID()) {
-    enabled_ = false;
-    return;
-  }
-
-  scoped_nsobject<NSArray> criteria([[NSArray alloc] initWithObjects:
-      DeviceMatching(kGenericDesktopUsagePage, kJoystickUsageNumber),
-      DeviceMatching(kGenericDesktopUsagePage, kGameUsageNumber),
-      DeviceMatching(kGenericDesktopUsagePage, kMultiAxisUsageNumber),
-      nil]);
-  IOHIDManagerSetDeviceMatchingMultiple(
-      hid_manager_ref_,
-      base::mac::NSToCFCast(criteria));
-
-  RegisterForNotifications();
-}
-
-void GamepadDataFetcherMac::RegisterForNotifications() {
-  // Register for plug/unplug notifications.
-  IOHIDManagerRegisterDeviceMatchingCallback(
-      hid_manager_ref_,
-      &DeviceAddCallback,
-      this);
-  IOHIDManagerRegisterDeviceRemovalCallback(
-      hid_manager_ref_,
-      DeviceRemoveCallback,
-      this);
-
-  // Register for value change notifications.
-  IOHIDManagerRegisterInputValueCallback(
-      hid_manager_ref_,
-      ValueChangedCallback,
-      this);
-
-  IOHIDManagerScheduleWithRunLoop(
-      hid_manager_ref_,
-      CFRunLoopGetMain(),
-      kCFRunLoopDefaultMode);
-
-  enabled_ = IOHIDManagerOpen(hid_manager_ref_,
-                              kIOHIDOptionsTypeSeizeDevice) == kIOReturnSuccess;
-}
-
-void GamepadDataFetcherMac::UnregisterFromNotifications() {
-  IOHIDManagerUnscheduleFromRunLoop(
-      hid_manager_ref_,
-      CFRunLoopGetCurrent(),
-      kCFRunLoopDefaultMode);
-  IOHIDManagerClose(hid_manager_ref_, kIOHIDOptionsTypeNone);
-}
-
-void GamepadDataFetcherMac::PauseHint(bool pause) {
-  if (pause)
-    UnregisterFromNotifications();
-  else
-    RegisterForNotifications();
-}
-
-GamepadDataFetcherMac::~GamepadDataFetcherMac() {
-  UnregisterFromNotifications();
-}
-
-GamepadDataFetcherMac* GamepadDataFetcherMac::InstanceFromContext(
-    void* context) {
-  return reinterpret_cast<GamepadDataFetcherMac*>(context);
-}
-
-void GamepadDataFetcherMac::DeviceAddCallback(void* context,
-                                              IOReturn result,
-                                              void* sender,
-                                              IOHIDDeviceRef ref) {
-  InstanceFromContext(context)->DeviceAdd(ref);
-}
-
-void GamepadDataFetcherMac::DeviceRemoveCallback(void* context,
-                                                 IOReturn result,
-                                                 void* sender,
-                                                 IOHIDDeviceRef ref) {
-  InstanceFromContext(context)->DeviceRemove(ref);
-}
-
-void GamepadDataFetcherMac::ValueChangedCallback(void* context,
-                                                 IOReturn result,
-                                                 void* sender,
-                                                 IOHIDValueRef ref) {
-  InstanceFromContext(context)->ValueChanged(ref);
-}
-
-void GamepadDataFetcherMac::AddButtonsAndAxes(NSArray* elements,
-                                              size_t slot) {
-  WebKit::WebGamepad& pad = data_.items[slot];
-  AssociatedData& associated = associated_[slot];
-
-  pad.axesLength = 0;
-  pad.buttonsLength = 0;
-  memset(pad.axes, 0, sizeof(pad.axes));
-  memset(pad.buttons, 0, sizeof(pad.buttons));
-
-  for (id elem in elements) {
-    IOHIDElementRef element = reinterpret_cast<IOHIDElementRef>(elem);
-    uint32_t usagePage = IOHIDElementGetUsagePage(element);
-    uint32_t usage = IOHIDElementGetUsage(element);
-    if (IOHIDElementGetType(element) == kIOHIDElementTypeInput_Button &&
-        usagePage == kButtonUsagePage) {
-      uint32_t button_index = usage - 1;
-      if (button_index < WebKit::WebGamepad::buttonsLengthCap) {
-        associated.button_elements[button_index] = element;
-        pad.buttonsLength = std::max(pad.buttonsLength, button_index + 1);
-      }
-    }
-    else if (IOHIDElementGetType(element) == kIOHIDElementTypeInput_Misc) {
-      uint32_t axis_index = usage - kAxisMinimumUsageNumber;
-      if (axis_index < WebKit::WebGamepad::axesLengthCap) {
-        associated.axis_minimums[axis_index] =
-            IOHIDElementGetLogicalMin(element);
-        associated.axis_maximums[axis_index] =
-            IOHIDElementGetLogicalMax(element);
-        associated.axis_elements[axis_index] = element;
-        pad.axesLength = std::max(pad.axesLength, axis_index + 1);
-      }
-    }
-  }
-}
-
-void GamepadDataFetcherMac::DeviceAdd(IOHIDDeviceRef device) {
-  using WebKit::WebGamepad;
-  using WebKit::WebGamepads;
-  using base::mac::CFToNSCast;
-  using base::mac::CFCastStrict;
-  size_t slot;
-
-  if (!enabled_)
-    return;
-
-  // Find an index for this device.
-  for (slot = 0; slot < WebGamepads::itemsLengthCap; ++slot) {
-    // If we already have this device, and it's already connected, don't do
-    // anything now.
-    if (associated_[slot].device_ref == device && data_.items[slot].connected)
-      return;
-    if (!data_.items[slot].connected)
-      break;
-  }
-
-  // We can't handle this many connected devices.
-  if (slot == WebGamepads::itemsLengthCap)
-    return;
-
-  NSNumber* vendor_id = CFToNSCast(CFCastStrict<CFNumberRef>(
-      IOHIDDeviceGetProperty(device, CFSTR(kIOHIDVendorIDKey))));
-  NSNumber* product_id = CFToNSCast(CFCastStrict<CFNumberRef>(
-      IOHIDDeviceGetProperty(device, CFSTR(kIOHIDProductIDKey))));
-  NSString* product = CFToNSCast(CFCastStrict<CFStringRef>(
-      IOHIDDeviceGetProperty(device, CFSTR(kIOHIDProductKey))));
-
-  NSString* ident([NSString stringWithFormat:
-      @"%@ (Vendor: %04x Product: %04x)",
-      product,
-      [vendor_id intValue],
-      [product_id intValue]]);
-  NSData* as16 = [ident dataUsingEncoding:NSUTF16StringEncoding];
-
-  const size_t kOutputLengthBytes = sizeof(data_.items[slot].id);
-  memset(&data_.items[slot].id, 0, kOutputLengthBytes);
-  [as16 getBytes:data_.items[slot].id
-          length:kOutputLengthBytes - sizeof(WebKit::WebUChar)];
-
-  base::mac::ScopedCFTypeRef<CFArrayRef> elements(
-      IOHIDDeviceCopyMatchingElements(device, NULL, kIOHIDOptionsTypeNone));
-  AddButtonsAndAxes(CFToNSCast(elements), slot);
-
-  associated_[slot].device_ref = device;
-  data_.items[slot].connected = true;
-  if (slot >= data_.length)
-    data_.length = slot + 1;
-}
-
-void GamepadDataFetcherMac::DeviceRemove(IOHIDDeviceRef device) {
-  using WebKit::WebGamepads;
-  size_t slot;
-  if (!enabled_)
-    return;
-
-  // Find the index for this device.
-  for (slot = 0; slot < WebGamepads::itemsLengthCap; ++slot) {
-    if (associated_[slot].device_ref == device && data_.items[slot].connected)
-      break;
-  }
-  DCHECK(slot < WebGamepads::itemsLengthCap);
-  // Leave associated device_ref so that it will be reconnected in the same
-  // location. Simply mark it as disconnected.
-  data_.items[slot].connected = false;
-}
-
-void GamepadDataFetcherMac::ValueChanged(IOHIDValueRef value) {
-  if (!enabled_)
-    return;
-
-  IOHIDElementRef element = IOHIDValueGetElement(value);
-  IOHIDDeviceRef device = IOHIDElementGetDevice(element);
-
-  // Find device slot.
-  size_t slot;
-  for (slot = 0; slot < data_.length; ++slot) {
-    if (data_.items[slot].connected && associated_[slot].device_ref == device)
-      break;
-  }
-  if (slot == data_.length)
-    return;
-
-  WebKit::WebGamepad& pad = data_.items[slot];
-  AssociatedData& associated = associated_[slot];
-
-  // Find and fill in the associated button event, if any.
-  for (size_t i = 0; i < pad.buttonsLength; ++i) {
-    if (associated.button_elements[i] == element) {
-      pad.buttons[i] = IOHIDValueGetIntegerValue(value) ? 1.f : 0.f;
-      return;
-    }
-  }
-
-  // Find and fill in the associated axis event, if any.
-  for (size_t i = 0; i < pad.axesLength; ++i) {
-    if (associated.axis_elements[i] == element) {
-      pad.axes[i] = NormalizeAxis(IOHIDValueGetIntegerValue(value),
-                                  associated.axis_minimums[i],
-                                  associated.axis_maximums[i]);
-      return;
-    }
-  }
-}
-
-void GamepadDataFetcherMac::GetGamepadData(WebKit::WebGamepads* pads, bool) {
-  if (!enabled_) {
-    pads->length = 0;
-    return;
-  }
-  memcpy(pads, &data_, sizeof(WebKit::WebGamepads));
-}
-
-}  // namespace content