cros: Force disable stylus features on pyro.

ash/common/system/chromeos/palette/palette_utils.cc

 // Copyright 2016 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 "ash/common/system/chromeos/palette/palette_utils.h"
 
 #include "ash/common/ash_switches.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/system/chromeos/palette/palette_tray.h"
 #include "ash/common/system/status_area_widget.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "base/command_line.h"
+#include "base/sys_info.h"
 #include "ui/events/devices/input_device_manager.h"
 #include "ui/events/devices/touchscreen_device.h"
 #include "ui/gfx/geometry/point.h"
 
 namespace ash {
 namespace palette_utils {
 
+namespace {
+// Pyro firmware currently reports it has a stylus but it does not.
+// TODO(jdufault): Remove this once firmware is fixed. See b/36367810.
+const char* kBlacklistedDevices[] = {"pyro"};
+
+bool IsBlacklisted(const std::string& name) {
+  return std::find(std::begin(kBlacklistedDevices),
+                   std::end(kBlacklistedDevices),
+                   name) != std::end(kBlacklistedDevices);
+}
+}  // namespace
+
 bool HasStylusInput() {
-  // Allow the user to force-enable by passing a switch.
+  // Allow the user to force enable or disable by passing a switch. If both are
+  // present, enabling takes precedence over disabling.
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kAshForceEnablePalette)) {
     return true;
   }
 
+  // Disable stylus for any blacklisted devices.
+  if (IsBlacklisted(base::SysInfo::GetLsbReleaseBoard()))
+    return false;
+
+  // Check to see if the hardware reports it is stylus capable.
   for (const ui::TouchscreenDevice& device :
        ui::InputDeviceManager::GetInstance()->GetTouchscreenDevices()) {
     if (device.is_stylus &&
         device.type == ui::InputDeviceType::INPUT_DEVICE_INTERNAL) {
       return true;
     }
   }
 
   return false;
 }
 
 bool IsPaletteEnabledOnEveryDisplay() {
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kAshEnablePaletteOnAllDisplays);
 }
 
 bool PaletteContainsPointInScreen(const gfx::Point& point) {
   for (WmWindow* window : WmShell::Get()->GetAllRootWindows()) {
     PaletteTray* palette_tray =
         WmShelf::ForWindow(window)->GetStatusAreaWidget()->palette_tray();
     if (palette_tray && palette_tray->ContainsPointInScreen(point))
       return true;
   }
 
   return false;
 }
 
 }  // namespace palette_utils
 }  // namespace ash