Provide a library interface to the virtual touchpad service.
And make VrWindowManager pay for^H^H^H^H^H^H^H^H use it. The library
interface is a step toward moving 2D embedding into VrCore because it
hides the binder connection that isn't directly accessible to VrCore.
As a matter of implementation, the touchpad-service client library
and the low-level evdev touchpad are derived from the same interface.
Bug: b/35990873
Test: VirtualTouchpad_test; integration TBD.
Change-Id: Ic922ff223ddd5a44f6fb4433a271f8341e93a0e7
diff --git a/services/vr/virtual_touchpad/VirtualTouchpadEvdev.cpp b/services/vr/virtual_touchpad/VirtualTouchpadEvdev.cpp
new file mode 100644
index 0000000..ae31156
--- /dev/null
+++ b/services/vr/virtual_touchpad/VirtualTouchpadEvdev.cpp
@@ -0,0 +1,130 @@
+#include "VirtualTouchpadEvdev.h"
+
+#include <android/input.h>
+#include <inttypes.h>
+#include <linux/input.h>
+#include <log/log.h>
+
+// References:
+// [0] Multi-touch (MT) Protocol,
+// https://www.kernel.org/doc/Documentation/input/multi-touch-protocol.txt
+
+namespace android {
+namespace dvr {
+
+namespace {
+
+// Virtual evdev device properties. The name is arbitrary, but Android can
+// use it to look up device configuration, so it must be unique. Vendor and
+// product values must be 0 to indicate an internal device and prevent a
+// similar lookup that could conflict with a physical device.
+static const char* const kDeviceName = "vr window manager virtual touchpad";
+static constexpr int16_t kDeviceBusType = BUS_VIRTUAL;
+static constexpr int16_t kDeviceVendor = 0;
+static constexpr int16_t kDeviceProduct = 0;
+static constexpr int16_t kDeviceVersion = 0x0001;
+
+static constexpr int32_t kWidth = 0x10000;
+static constexpr int32_t kHeight = 0x10000;
+static constexpr int32_t kSlots = 2;
+
+} // anonymous namespace
+
+sp<VirtualTouchpad> VirtualTouchpadEvdev::Create() {
+ VirtualTouchpadEvdev* const touchpad = new VirtualTouchpadEvdev();
+ const status_t status = touchpad->Initialize();
+ if (status) {
+ ALOGE("initialization failed: %d", status);
+ return sp<VirtualTouchpad>();
+ }
+ return sp<VirtualTouchpad>(touchpad);
+}
+
+int VirtualTouchpadEvdev::Initialize() {
+ if (!injector_) {
+ owned_injector_.reset(new EvdevInjector());
+ injector_ = owned_injector_.get();
+ }
+ injector_->ConfigureBegin(kDeviceName, kDeviceBusType, kDeviceVendor,
+ kDeviceProduct, kDeviceVersion);
+ injector_->ConfigureInputProperty(INPUT_PROP_DIRECT);
+ injector_->ConfigureMultiTouchXY(0, 0, kWidth - 1, kHeight - 1);
+ injector_->ConfigureAbsSlots(kSlots);
+ injector_->ConfigureKey(BTN_TOUCH);
+ injector_->ConfigureKey(BTN_BACK);
+ injector_->ConfigureEnd();
+ return injector_->GetError();
+}
+
+int VirtualTouchpadEvdev::Touch(float x, float y, float pressure) {
+ if ((x < 0.0f) || (x >= 1.0f) || (y < 0.0f) || (y >= 1.0f)) {
+ return EINVAL;
+ }
+ int32_t device_x = x * kWidth;
+ int32_t device_y = y * kHeight;
+ touches_ = ((touches_ & 1) << 1) | (pressure > 0);
+ ALOGV("(%f,%f) %f -> (%" PRId32 ",%" PRId32 ") %d",
+ x, y, pressure, device_x, device_y, touches_);
+
+ if (!injector_) {
+ return EvdevInjector::ERROR_SEQUENCING;
+ }
+ injector_->ResetError();
+ switch (touches_) {
+ case 0b00: // Hover continues.
+ if (device_x != last_device_x_ || device_y != last_device_y_) {
+ injector_->SendMultiTouchXY(0, 0, device_x, device_y);
+ injector_->SendSynReport();
+ }
+ break;
+ case 0b01: // Touch begins.
+ // Press.
+ injector_->SendMultiTouchXY(0, 0, device_x, device_y);
+ injector_->SendKey(BTN_TOUCH, EvdevInjector::KEY_PRESS);
+ injector_->SendSynReport();
+ break;
+ case 0b10: // Touch ends.
+ injector_->SendKey(BTN_TOUCH, EvdevInjector::KEY_RELEASE);
+ injector_->SendMultiTouchLift(0);
+ injector_->SendSynReport();
+ break;
+ case 0b11: // Touch continues.
+ if (device_x != last_device_x_ || device_y != last_device_y_) {
+ injector_->SendMultiTouchXY(0, 0, device_x, device_y);
+ injector_->SendSynReport();
+ }
+ break;
+ }
+ last_device_x_ = device_x;
+ last_device_y_ = device_y;
+
+ return injector_->GetError();
+}
+
+int VirtualTouchpadEvdev::ButtonState(int buttons) {
+ const int changes = last_motion_event_buttons_ ^ buttons;
+ if (!changes) {
+ return 0;
+ }
+ if (buttons & ~AMOTION_EVENT_BUTTON_BACK) {
+ return ENOTSUP;
+ }
+ ALOGV("change %X from %X to %X", changes, last_motion_event_buttons_,
+ buttons);
+
+ if (!injector_) {
+ return EvdevInjector::ERROR_SEQUENCING;
+ }
+ injector_->ResetError();
+ if (changes & AMOTION_EVENT_BUTTON_BACK) {
+ injector_->SendKey(BTN_BACK,
+ (buttons & AMOTION_EVENT_BUTTON_BACK)
+ ? EvdevInjector::KEY_PRESS
+ : EvdevInjector::KEY_RELEASE);
+ }
+ last_motion_event_buttons_ = buttons;
+ return injector_->GetError();
+}
+
+} // namespace dvr
+} // namespace android