Implement the gamepad API in the IPC proxy

content/browser/gamepad/platform_data_fetcher_linux.cc

Index: content/browser/gamepad/platform_data_fetcher_linux.cc
diff --git a/content/browser/gamepad/platform_data_fetcher_linux.cc b/content/browser/gamepad/platform_data_fetcher_linux.cc
deleted file mode 100644
index e364eac9babadcb3b445351b8a2b564ec6afb6a8..0000000000000000000000000000000000000000
--- a/content/browser/gamepad/platform_data_fetcher_linux.cc
+++ /dev/null
@@ -1,258 +0,0 @@
-// 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 "content/browser/gamepad/platform_data_fetcher_linux.h"
-
-#include <fcntl.h>
-#include <libudev.h>
-#include <linux/joystick.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include "base/debug/trace_event.h"
-#include "base/eintr_wrapper.h"
-#include "base/message_loop.h"
-#include "base/string_number_conversions.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
-#include "base/utf_string_conversions.h"
-#include "content/browser/udev_linux.h"
-
-namespace {
-
-const char kInputSubsystem[] = "input";
-const char kUsbSubsystem[] = "usb";
-const char kUsbDeviceType[] = "usb_device";
-const float kMaxLinuxAxisValue = 32767.0;
-
-void CloseFileDescriptorIfValid(int fd) {
-  if (fd >= 0)
-    close(fd);
-}
-
-bool IsGamepad(udev_device* dev, int* index, std::string* path) {
-  if (!udev_device_get_property_value(dev, "ID_INPUT_JOYSTICK"))
-    return false;
-
-  const char* node_path = udev_device_get_devnode(dev);
-  if (!node_path)
-    return false;
-
-  static const char kJoystickRoot[] = "/dev/input/js";
-  bool is_gamepad = StartsWithASCII(node_path, kJoystickRoot, true);
-  if (!is_gamepad)
-    return false;
-
-  int tmp_idx = -1;
-  const int base_len = sizeof(kJoystickRoot) - 1;
-  base::StringPiece str(&node_path[base_len], strlen(node_path) - base_len);
-  if (!base::StringToInt(str, &tmp_idx))
-    return false;
-  if (tmp_idx < 0 ||
-      tmp_idx >= static_cast<int>(WebKit::WebGamepads::itemsLengthCap)) {
-    return false;
-  }
-  *index = tmp_idx;
-  *path = node_path;
-  return true;
-}
-
-}  // namespace
-
-namespace content {
-
-using WebKit::WebGamepad;
-using WebKit::WebGamepads;
-
-GamepadPlatformDataFetcherLinux::GamepadPlatformDataFetcherLinux() {
-  for (size_t i = 0; i < arraysize(device_fds_); ++i)
-    device_fds_[i] = -1;
-  memset(mappers_, 0, sizeof(mappers_));
-
-  std::vector<UdevLinux::UdevMonitorFilter> filters;
-  filters.push_back(
-      content::UdevLinux::UdevMonitorFilter(kInputSubsystem, NULL));
-  udev_.reset(
-      new UdevLinux(filters,
-                    base::Bind(&GamepadPlatformDataFetcherLinux::RefreshDevice,
-                               base::Unretained(this))));
-
-  EnumerateDevices();
-}
-
-GamepadPlatformDataFetcherLinux::~GamepadPlatformDataFetcherLinux() {
-  for (size_t i = 0; i < WebGamepads::itemsLengthCap; ++i)
-    CloseFileDescriptorIfValid(device_fds_[i]);
-}
-
-void GamepadPlatformDataFetcherLinux::GetGamepadData(WebGamepads* pads, bool) {
-  TRACE_EVENT0("GAMEPAD", "GetGamepadData");
-
-  data_.length = WebGamepads::itemsLengthCap;
-
-  // Update our internal state.
-  for (size_t i = 0; i < WebGamepads::itemsLengthCap; ++i) {
-    if (device_fds_[i] >= 0) {
-      ReadDeviceData(i);
-    }
-  }
-
-  // Copy to the current state to the output buffer, using the mapping
-  // function, if there is one available.
-  pads->length = data_.length;
-  for (size_t i = 0; i < WebGamepads::itemsLengthCap; ++i) {
-    if (mappers_[i])
-      mappers_[i](data_.items[i], &pads->items[i]);
-    else
-      pads->items[i] = data_.items[i];
-  }
-}
-
-// Used during enumeration, and monitor notifications.
-void GamepadPlatformDataFetcherLinux::RefreshDevice(udev_device* dev) {
-  int index;
-  std::string node_path;
-  if (IsGamepad(dev, &index, &node_path)) {
-    int& device_fd = device_fds_[index];
-    WebGamepad& pad = data_.items[index];
-    GamepadStandardMappingFunction& mapper = mappers_[index];
-
-    CloseFileDescriptorIfValid(device_fd);
-
-    // The device pointed to by dev contains information about the logical
-    // joystick device. In order to get the information about the physical
-    // hardware, get the parent device that is also in the "input" subsystem.
-    // This function should just walk up the tree one level.
-    dev = udev_device_get_parent_with_subsystem_devtype(
-        dev,
-        kInputSubsystem,
-        NULL);
-    if (!dev) {
-      // Unable to get device information, don't use this device.
-      device_fd = -1;
-      pad.connected = false;
-      return;
-    }
-
-    device_fd = HANDLE_EINTR(open(node_path.c_str(), O_RDONLY | O_NONBLOCK));
-    if (device_fd < 0) {
-      // Unable to open device, don't use.
-      pad.connected = false;
-      return;
-    }
-
-    const char* vendor_id = udev_device_get_sysattr_value(dev, "id/vendor");
-    const char* product_id = udev_device_get_sysattr_value(dev, "id/product");
-    mapper = GetGamepadStandardMappingFunction(vendor_id, product_id);
-
-    // Driver returns utf-8 strings here, so combine in utf-8 first and
-    // convert to WebUChar later once we've picked an id string.
-    const char* name = udev_device_get_sysattr_value(dev, "name");
-    std::string name_string = base::StringPrintf("%s", name);
-
-    // In many cases the information the input subsystem contains isn't
-    // as good as the information that the device bus has, walk up further
-    // to the subsystem/device type "usb"/"usb_device" and if this device
-    // has the same vendor/product id, prefer the description from that.
-    struct udev_device *usb_dev = udev_device_get_parent_with_subsystem_devtype(
-        dev,
-        kUsbSubsystem,
-        kUsbDeviceType);
-    if (usb_dev) {
-      const char* usb_vendor_id =
-          udev_device_get_sysattr_value(usb_dev, "idVendor");
-      const char* usb_product_id =
-          udev_device_get_sysattr_value(usb_dev, "idProduct");
-
-      if (strcmp(vendor_id, usb_vendor_id) == 0 &&
-          strcmp(product_id, usb_product_id) == 0) {
-        const char* manufacturer =
-            udev_device_get_sysattr_value(usb_dev, "manufacturer");
-        const char* product = udev_device_get_sysattr_value(usb_dev, "product");
-
-        // Replace the previous name string with one containing the better
-        // information, again driver returns utf-8 strings here so combine
-        // in utf-8 for conversion to WebUChar below.
-        name_string = base::StringPrintf("%s %s", manufacturer, product);
-      }
-    }
-
-    // Append the vendor and product information then convert the utf-8
-    // id string to WebUChar.
-    std::string id = name_string + base::StringPrintf(
-        " (%sVendor: %s Product: %s)",
-        mapper ? "STANDARD GAMEPAD " : "",
-        vendor_id,
-        product_id);
-    TruncateUTF8ToByteSize(id, WebGamepad::idLengthCap - 1, &id);
-    string16 tmp16 = UTF8ToUTF16(id);
-    memset(pad.id, 0, sizeof(pad.id));
-    tmp16.copy(pad.id, arraysize(pad.id) - 1);
-
-    pad.connected = true;
-  }
-}
-
-void GamepadPlatformDataFetcherLinux::EnumerateDevices() {
-  udev_enumerate* enumerate = udev_enumerate_new(udev_->udev_handle());
-  if (!enumerate)
-    return;
-  int ret = udev_enumerate_add_match_subsystem(enumerate, kInputSubsystem);
-  if (ret != 0)
-    return;
-  ret = udev_enumerate_scan_devices(enumerate);
-  if (ret != 0)
-    return;
-
-  udev_list_entry* devices = udev_enumerate_get_list_entry(enumerate);
-  for (udev_list_entry* dev_list_entry = devices;
-       dev_list_entry != NULL;
-       dev_list_entry = udev_list_entry_get_next(dev_list_entry)) {
-    // Get the filename of the /sys entry for the device and create a
-    // udev_device object (dev) representing it
-    const char* path = udev_list_entry_get_name(dev_list_entry);
-    udev_device* dev = udev_device_new_from_syspath(udev_->udev_handle(), path);
-    if (!dev)
-      continue;
-    RefreshDevice(dev);
-    udev_device_unref(dev);
-  }
-  // Free the enumerator object
-  udev_enumerate_unref(enumerate);
-}
-
-void GamepadPlatformDataFetcherLinux::ReadDeviceData(size_t index) {
-  // Linker does not like CHECK_LT(index, WebGamepads::itemsLengthCap). =/
-  if (index >= WebGamepads::itemsLengthCap) {
-    CHECK(false);
-    return;
-  }
-
-  const int& fd = device_fds_[index];
-  WebGamepad& pad = data_.items[index];
-  DCHECK_GE(fd, 0);
-
-  js_event event;
-  while (HANDLE_EINTR(read(fd, &event, sizeof(struct js_event)) > 0)) {
-    size_t item = event.number;
-    if (event.type & JS_EVENT_AXIS) {
-      if (item >= WebGamepad::axesLengthCap)
-        continue;
-      pad.axes[item] = event.value / kMaxLinuxAxisValue;
-      if (item >= pad.axesLength)
-        pad.axesLength = item + 1;
-    } else if (event.type & JS_EVENT_BUTTON) {
-      if (item >= WebGamepad::buttonsLengthCap)
-        continue;
-      pad.buttons[item] = event.value ? 1.0 : 0.0;
-      if (item >= pad.buttonsLength)
-        pad.buttonsLength = item + 1;
-    }
-    pad.timestamp = event.time;
-  }
-}
-
-}  // namespace content