Move virtual device infra to libinput
These pieces should be part of libinput, because they are needed to
create uinput devices efficiently.
Bug: 335496563
Test: build only
Flag: EXEMPT refactor
Change-Id: I506a592b83f549e6db9a03bc9bb86c047f31f872
diff --git a/libs/input/VirtualInputDevice.cpp b/libs/input/VirtualInputDevice.cpp
index 0579967..51edbf1 100644
--- a/libs/input/VirtualInputDevice.cpp
+++ b/libs/input/VirtualInputDevice.cpp
@@ -16,6 +16,7 @@
#define LOG_TAG "VirtualInputDevice"
+#include <android-base/logging.h>
#include <android/input.h>
#include <android/keycodes.h>
#include <android_companion_virtualdevice_flags.h>
@@ -23,26 +24,259 @@
#include <input/Input.h>
#include <input/VirtualInputDevice.h>
#include <linux/uinput.h>
-#include <math.h>
-#include <utils/Log.h>
-#include <map>
#include <string>
using android::base::unique_fd;
+namespace {
+
/**
* Log debug messages about native virtual input devices.
* Enable this via "adb shell setprop log.tag.VirtualInputDevice DEBUG"
*/
-static bool isDebug() {
+bool isDebug() {
return __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG, ANDROID_LOG_INFO);
}
+unique_fd invalidFd() {
+ return unique_fd(-1);
+}
+
+} // namespace
+
namespace android {
namespace vd_flags = android::companion::virtualdevice::flags;
+/** Creates a new uinput device and assigns a file descriptor. */
+unique_fd openUinput(const char* readableName, int32_t vendorId, int32_t productId,
+ const char* phys, DeviceType deviceType, int32_t screenHeight,
+ int32_t screenWidth) {
+ unique_fd fd(TEMP_FAILURE_RETRY(::open("/dev/uinput", O_WRONLY | O_NONBLOCK)));
+ if (fd < 0) {
+ ALOGE("Error creating uinput device: %s", strerror(errno));
+ return invalidFd();
+ }
+
+ ioctl(fd, UI_SET_PHYS, phys);
+
+ ioctl(fd, UI_SET_EVBIT, EV_KEY);
+ ioctl(fd, UI_SET_EVBIT, EV_SYN);
+ switch (deviceType) {
+ case DeviceType::DPAD:
+ for (const auto& [_, keyCode] : VirtualDpad::DPAD_KEY_CODE_MAPPING) {
+ ioctl(fd, UI_SET_KEYBIT, keyCode);
+ }
+ break;
+ case DeviceType::KEYBOARD:
+ for (const auto& [_, keyCode] : VirtualKeyboard::KEY_CODE_MAPPING) {
+ ioctl(fd, UI_SET_KEYBIT, keyCode);
+ }
+ break;
+ case DeviceType::MOUSE:
+ ioctl(fd, UI_SET_EVBIT, EV_REL);
+ ioctl(fd, UI_SET_KEYBIT, BTN_LEFT);
+ ioctl(fd, UI_SET_KEYBIT, BTN_RIGHT);
+ ioctl(fd, UI_SET_KEYBIT, BTN_MIDDLE);
+ ioctl(fd, UI_SET_KEYBIT, BTN_BACK);
+ ioctl(fd, UI_SET_KEYBIT, BTN_FORWARD);
+ ioctl(fd, UI_SET_RELBIT, REL_X);
+ ioctl(fd, UI_SET_RELBIT, REL_Y);
+ ioctl(fd, UI_SET_RELBIT, REL_WHEEL);
+ ioctl(fd, UI_SET_RELBIT, REL_HWHEEL);
+ if (vd_flags::high_resolution_scroll()) {
+ ioctl(fd, UI_SET_RELBIT, REL_WHEEL_HI_RES);
+ ioctl(fd, UI_SET_RELBIT, REL_HWHEEL_HI_RES);
+ }
+ break;
+ case DeviceType::TOUCHSCREEN:
+ ioctl(fd, UI_SET_EVBIT, EV_ABS);
+ ioctl(fd, UI_SET_KEYBIT, BTN_TOUCH);
+ ioctl(fd, UI_SET_ABSBIT, ABS_MT_SLOT);
+ ioctl(fd, UI_SET_ABSBIT, ABS_MT_POSITION_X);
+ ioctl(fd, UI_SET_ABSBIT, ABS_MT_POSITION_Y);
+ ioctl(fd, UI_SET_ABSBIT, ABS_MT_TRACKING_ID);
+ ioctl(fd, UI_SET_ABSBIT, ABS_MT_TOOL_TYPE);
+ ioctl(fd, UI_SET_ABSBIT, ABS_MT_TOUCH_MAJOR);
+ ioctl(fd, UI_SET_ABSBIT, ABS_MT_PRESSURE);
+ ioctl(fd, UI_SET_PROPBIT, INPUT_PROP_DIRECT);
+ break;
+ case DeviceType::STYLUS:
+ ioctl(fd, UI_SET_EVBIT, EV_ABS);
+ ioctl(fd, UI_SET_KEYBIT, BTN_TOUCH);
+ ioctl(fd, UI_SET_KEYBIT, BTN_STYLUS);
+ ioctl(fd, UI_SET_KEYBIT, BTN_STYLUS2);
+ ioctl(fd, UI_SET_KEYBIT, BTN_TOOL_PEN);
+ ioctl(fd, UI_SET_KEYBIT, BTN_TOOL_RUBBER);
+ ioctl(fd, UI_SET_ABSBIT, ABS_X);
+ ioctl(fd, UI_SET_ABSBIT, ABS_Y);
+ ioctl(fd, UI_SET_ABSBIT, ABS_TILT_X);
+ ioctl(fd, UI_SET_ABSBIT, ABS_TILT_Y);
+ ioctl(fd, UI_SET_ABSBIT, ABS_PRESSURE);
+ ioctl(fd, UI_SET_PROPBIT, INPUT_PROP_DIRECT);
+ break;
+ case DeviceType::ROTARY_ENCODER:
+ ioctl(fd, UI_SET_EVBIT, EV_REL);
+ ioctl(fd, UI_SET_RELBIT, REL_WHEEL);
+ if (vd_flags::high_resolution_scroll()) {
+ ioctl(fd, UI_SET_RELBIT, REL_WHEEL_HI_RES);
+ }
+ break;
+ default:
+ ALOGE("Invalid input device type %d", static_cast<int32_t>(deviceType));
+ return invalidFd();
+ }
+
+ int version;
+ if (ioctl(fd, UI_GET_VERSION, &version) == 0 && version >= 5) {
+ uinput_setup setup;
+ memset(&setup, 0, sizeof(setup));
+ std::strncpy(setup.name, readableName, UINPUT_MAX_NAME_SIZE);
+ setup.id.version = 1;
+ setup.id.bustype = BUS_VIRTUAL;
+ setup.id.vendor = vendorId;
+ setup.id.product = productId;
+ if (deviceType == DeviceType::TOUCHSCREEN) {
+ uinput_abs_setup xAbsSetup;
+ xAbsSetup.code = ABS_MT_POSITION_X;
+ xAbsSetup.absinfo.maximum = screenWidth - 1;
+ xAbsSetup.absinfo.minimum = 0;
+ if (ioctl(fd, UI_ABS_SETUP, &xAbsSetup) != 0) {
+ ALOGE("Error creating touchscreen uinput x axis: %s", strerror(errno));
+ return invalidFd();
+ }
+ uinput_abs_setup yAbsSetup;
+ yAbsSetup.code = ABS_MT_POSITION_Y;
+ yAbsSetup.absinfo.maximum = screenHeight - 1;
+ yAbsSetup.absinfo.minimum = 0;
+ if (ioctl(fd, UI_ABS_SETUP, &yAbsSetup) != 0) {
+ ALOGE("Error creating touchscreen uinput y axis: %s", strerror(errno));
+ return invalidFd();
+ }
+ uinput_abs_setup majorAbsSetup;
+ majorAbsSetup.code = ABS_MT_TOUCH_MAJOR;
+ majorAbsSetup.absinfo.maximum = screenWidth - 1;
+ majorAbsSetup.absinfo.minimum = 0;
+ if (ioctl(fd, UI_ABS_SETUP, &majorAbsSetup) != 0) {
+ ALOGE("Error creating touchscreen uinput major axis: %s", strerror(errno));
+ return invalidFd();
+ }
+ uinput_abs_setup pressureAbsSetup;
+ pressureAbsSetup.code = ABS_MT_PRESSURE;
+ pressureAbsSetup.absinfo.maximum = 255;
+ pressureAbsSetup.absinfo.minimum = 0;
+ if (ioctl(fd, UI_ABS_SETUP, &pressureAbsSetup) != 0) {
+ ALOGE("Error creating touchscreen uinput pressure axis: %s", strerror(errno));
+ return invalidFd();
+ }
+ uinput_abs_setup slotAbsSetup;
+ slotAbsSetup.code = ABS_MT_SLOT;
+ slotAbsSetup.absinfo.maximum = MAX_POINTERS - 1;
+ slotAbsSetup.absinfo.minimum = 0;
+ if (ioctl(fd, UI_ABS_SETUP, &slotAbsSetup) != 0) {
+ ALOGE("Error creating touchscreen uinput slots: %s", strerror(errno));
+ return invalidFd();
+ }
+ uinput_abs_setup trackingIdAbsSetup;
+ trackingIdAbsSetup.code = ABS_MT_TRACKING_ID;
+ trackingIdAbsSetup.absinfo.maximum = MAX_POINTERS - 1;
+ trackingIdAbsSetup.absinfo.minimum = 0;
+ if (ioctl(fd, UI_ABS_SETUP, &trackingIdAbsSetup) != 0) {
+ ALOGE("Error creating touchscreen uinput tracking ids: %s", strerror(errno));
+ return invalidFd();
+ }
+ } else if (deviceType == DeviceType::STYLUS) {
+ uinput_abs_setup xAbsSetup;
+ xAbsSetup.code = ABS_X;
+ xAbsSetup.absinfo.maximum = screenWidth - 1;
+ xAbsSetup.absinfo.minimum = 0;
+ if (ioctl(fd, UI_ABS_SETUP, &xAbsSetup) != 0) {
+ ALOGE("Error creating stylus uinput x axis: %s", strerror(errno));
+ return invalidFd();
+ }
+ uinput_abs_setup yAbsSetup;
+ yAbsSetup.code = ABS_Y;
+ yAbsSetup.absinfo.maximum = screenHeight - 1;
+ yAbsSetup.absinfo.minimum = 0;
+ if (ioctl(fd, UI_ABS_SETUP, &yAbsSetup) != 0) {
+ ALOGE("Error creating stylus uinput y axis: %s", strerror(errno));
+ return invalidFd();
+ }
+ uinput_abs_setup tiltXAbsSetup;
+ tiltXAbsSetup.code = ABS_TILT_X;
+ tiltXAbsSetup.absinfo.maximum = 90;
+ tiltXAbsSetup.absinfo.minimum = -90;
+ if (ioctl(fd, UI_ABS_SETUP, &tiltXAbsSetup) != 0) {
+ ALOGE("Error creating stylus uinput tilt x axis: %s", strerror(errno));
+ return invalidFd();
+ }
+ uinput_abs_setup tiltYAbsSetup;
+ tiltYAbsSetup.code = ABS_TILT_Y;
+ tiltYAbsSetup.absinfo.maximum = 90;
+ tiltYAbsSetup.absinfo.minimum = -90;
+ if (ioctl(fd, UI_ABS_SETUP, &tiltYAbsSetup) != 0) {
+ ALOGE("Error creating stylus uinput tilt y axis: %s", strerror(errno));
+ return invalidFd();
+ }
+ uinput_abs_setup pressureAbsSetup;
+ pressureAbsSetup.code = ABS_PRESSURE;
+ pressureAbsSetup.absinfo.maximum = 255;
+ pressureAbsSetup.absinfo.minimum = 0;
+ if (ioctl(fd, UI_ABS_SETUP, &pressureAbsSetup) != 0) {
+ ALOGE("Error creating touchscreen uinput pressure axis: %s", strerror(errno));
+ return invalidFd();
+ }
+ }
+ if (ioctl(fd, UI_DEV_SETUP, &setup) != 0) {
+ ALOGE("Error creating uinput device: %s", strerror(errno));
+ return invalidFd();
+ }
+ } else {
+ // UI_DEV_SETUP was not introduced until version 5. Try setting up manually.
+ ALOGI("Falling back to version %d manual setup", version);
+ uinput_user_dev fallback;
+ memset(&fallback, 0, sizeof(fallback));
+ std::strncpy(fallback.name, readableName, UINPUT_MAX_NAME_SIZE);
+ fallback.id.version = 1;
+ fallback.id.bustype = BUS_VIRTUAL;
+ fallback.id.vendor = vendorId;
+ fallback.id.product = productId;
+ if (deviceType == DeviceType::TOUCHSCREEN) {
+ fallback.absmin[ABS_MT_POSITION_X] = 0;
+ fallback.absmax[ABS_MT_POSITION_X] = screenWidth - 1;
+ fallback.absmin[ABS_MT_POSITION_Y] = 0;
+ fallback.absmax[ABS_MT_POSITION_Y] = screenHeight - 1;
+ fallback.absmin[ABS_MT_TOUCH_MAJOR] = 0;
+ fallback.absmax[ABS_MT_TOUCH_MAJOR] = screenWidth - 1;
+ fallback.absmin[ABS_MT_PRESSURE] = 0;
+ fallback.absmax[ABS_MT_PRESSURE] = 255;
+ } else if (deviceType == DeviceType::STYLUS) {
+ fallback.absmin[ABS_X] = 0;
+ fallback.absmax[ABS_X] = screenWidth - 1;
+ fallback.absmin[ABS_Y] = 0;
+ fallback.absmax[ABS_Y] = screenHeight - 1;
+ fallback.absmin[ABS_TILT_X] = -90;
+ fallback.absmax[ABS_TILT_X] = 90;
+ fallback.absmin[ABS_TILT_Y] = -90;
+ fallback.absmax[ABS_TILT_Y] = 90;
+ fallback.absmin[ABS_PRESSURE] = 0;
+ fallback.absmax[ABS_PRESSURE] = 255;
+ }
+ if (TEMP_FAILURE_RETRY(write(fd, &fallback, sizeof(fallback))) != sizeof(fallback)) {
+ ALOGE("Error creating uinput device: %s", strerror(errno));
+ return invalidFd();
+ }
+ }
+
+ if (ioctl(fd, UI_DEV_CREATE) != 0) {
+ ALOGE("Error creating uinput device: %s", strerror(errno));
+ return invalidFd();
+ }
+
+ return fd;
+}
+
VirtualInputDevice::VirtualInputDevice(unique_fd fd) : mFd(std::move(fd)) {}
VirtualInputDevice::~VirtualInputDevice() {