Merge "EventHub: Prevent duplicate descriptors" am: 27883159d3 am: 9ea35a9163
Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2160836
Change-Id: I36d949bb877fe30ba519dfdda8a5b5a291733e0f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/services/inputflinger/reader/EventHub.cpp b/services/inputflinger/reader/EventHub.cpp
index 669d2e1..eef20a9 100644
--- a/services/inputflinger/reader/EventHub.cpp
+++ b/services/inputflinger/reader/EventHub.cpp
@@ -1309,7 +1309,8 @@
if (!identifier.uniqueId.empty()) {
rawDescriptor += "uniqueId:";
rawDescriptor += identifier.uniqueId;
- } else if (identifier.nonce != 0) {
+ }
+ if (identifier.nonce != 0) {
rawDescriptor += StringPrintf("nonce:%04x", identifier.nonce);
}
@@ -1337,16 +1338,20 @@
// of Android. In practice we sometimes get devices that cannot be uniquely
// identified. In this case we enforce uniqueness between connected devices.
// Ideally, we also want the descriptor to be short and relatively opaque.
+ // Note that we explicitly do not use the path or location for external devices
+ // as their path or location will change as they are plugged/unplugged or moved
+ // to different ports. We do fallback to using name and location in the case of
+ // internal devices which are detected by the vendor and product being 0 in
+ // generateDescriptor. If two identical descriptors are detected we will fallback
+ // to using a 'nonce' and incrementing it until the new descriptor no longer has
+ // a match with any existing descriptors.
identifier.nonce = 0;
std::string rawDescriptor = generateDescriptor(identifier);
- if (identifier.uniqueId.empty()) {
- // If it didn't have a unique id check for conflicts and enforce
- // uniqueness if necessary.
- while (getDeviceByDescriptorLocked(identifier.descriptor) != nullptr) {
- identifier.nonce++;
- rawDescriptor = generateDescriptor(identifier);
- }
+ // Enforce that the generated descriptor is unique.
+ while (hasDeviceWithDescriptorLocked(identifier.descriptor)) {
+ identifier.nonce++;
+ rawDescriptor = generateDescriptor(identifier);
}
ALOGV("Created descriptor: raw=%s, cooked=%s", rawDescriptor.c_str(),
identifier.descriptor.c_str());
@@ -1421,13 +1426,22 @@
return vibrators;
}
-EventHub::Device* EventHub::getDeviceByDescriptorLocked(const std::string& descriptor) const {
- for (const auto& [id, device] : mDevices) {
+/**
+ * Checks both mDevices and mOpeningDevices for a device with the descriptor passed.
+ */
+bool EventHub::hasDeviceWithDescriptorLocked(const std::string& descriptor) const {
+ for (const auto& device : mOpeningDevices) {
if (descriptor == device->identifier.descriptor) {
- return device.get();
+ return true;
}
}
- return nullptr;
+
+ for (const auto& [id, device] : mDevices) {
+ if (descriptor == device->identifier.descriptor) {
+ return true;
+ }
+ }
+ return false;
}
EventHub::Device* EventHub::getDeviceLocked(int32_t deviceId) const {
diff --git a/services/inputflinger/reader/InputReader.cpp b/services/inputflinger/reader/InputReader.cpp
index 9c5a129..a378ba8 100644
--- a/services/inputflinger/reader/InputReader.cpp
+++ b/services/inputflinger/reader/InputReader.cpp
@@ -38,6 +38,26 @@
namespace android {
+/**
+ * Determines if the identifiers passed are a sub-devices. Sub-devices are physical devices
+ * that expose multiple input device paths such a keyboard that also has a touchpad input.
+ * These are separate devices with unique descriptors in EventHub, but InputReader should
+ * create a single InputDevice for them.
+ * Sub-devices are detected by the following criteria:
+ * 1. The vendor, product, bus, version, and unique id match
+ * 2. The location matches. The location is used to distinguish a single device with multiple
+ * inputs versus the same device plugged into multiple ports.
+ */
+
+static bool isSubDevice(const InputDeviceIdentifier& identifier1,
+ const InputDeviceIdentifier& identifier2) {
+ return (identifier1.vendor == identifier2.vendor &&
+ identifier1.product == identifier2.product && identifier1.bus == identifier2.bus &&
+ identifier1.version == identifier2.version &&
+ identifier1.uniqueId == identifier2.uniqueId &&
+ identifier1.location == identifier2.location);
+}
+
// --- InputReader ---
InputReader::InputReader(std::shared_ptr<EventHubInterface> eventHub,
@@ -270,8 +290,9 @@
std::shared_ptr<InputDevice> InputReader::createDeviceLocked(
int32_t eventHubId, const InputDeviceIdentifier& identifier) {
auto deviceIt = std::find_if(mDevices.begin(), mDevices.end(), [identifier](auto& devicePair) {
- return devicePair.second->getDescriptor().size() && identifier.descriptor.size() &&
- devicePair.second->getDescriptor() == identifier.descriptor;
+ const InputDeviceIdentifier identifier2 =
+ devicePair.second->getDeviceInfo().getIdentifier();
+ return isSubDevice(identifier, identifier2);
});
std::shared_ptr<InputDevice> device;
diff --git a/services/inputflinger/reader/include/EventHub.h b/services/inputflinger/reader/include/EventHub.h
index 130c556..54c6810 100644
--- a/services/inputflinger/reader/include/EventHub.h
+++ b/services/inputflinger/reader/include/EventHub.h
@@ -650,7 +650,6 @@
void scanDevicesLocked() REQUIRES(mLock);
status_t readNotifyLocked() REQUIRES(mLock);
- Device* getDeviceByDescriptorLocked(const std::string& descriptor) const REQUIRES(mLock);
Device* getDeviceLocked(int32_t deviceId) const REQUIRES(mLock);
Device* getDeviceByPathLocked(const std::string& devicePath) const REQUIRES(mLock);
/**
@@ -660,6 +659,9 @@
Device* getDeviceByFdLocked(int fd) const REQUIRES(mLock);
int32_t getNextControllerNumberLocked(const std::string& name) REQUIRES(mLock);
+
+ bool hasDeviceWithDescriptorLocked(const std::string& descriptor) const REQUIRES(mLock);
+
void releaseControllerNumberLocked(int32_t num) REQUIRES(mLock);
void reportDeviceAddedForStatisticsLocked(const InputDeviceIdentifier& identifier,
ftl::Flags<InputDeviceClass> classes) REQUIRES(mLock);
diff --git a/services/inputflinger/tests/EventHub_test.cpp b/services/inputflinger/tests/EventHub_test.cpp
index ef68a84..6ef6e44 100644
--- a/services/inputflinger/tests/EventHub_test.cpp
+++ b/services/inputflinger/tests/EventHub_test.cpp
@@ -180,6 +180,20 @@
}
/**
+ * Ensure that two identical devices get assigned unique descriptors from EventHub.
+ */
+TEST_F(EventHubTest, DevicesWithMatchingUniqueIdsAreUnique) {
+ std::unique_ptr<UinputHomeKey> keyboard2 = createUinputDevice<UinputHomeKey>();
+ int32_t deviceId2;
+ ASSERT_NO_FATAL_FAILURE(deviceId2 = waitForDeviceCreation());
+
+ ASSERT_NE(mEventHub->getDeviceIdentifier(mDeviceId).descriptor,
+ mEventHub->getDeviceIdentifier(deviceId2).descriptor);
+ keyboard2.reset();
+ waitForDeviceClose(deviceId2);
+}
+
+/**
* Ensure that input_events are generated with monotonic clock.
* That means input_event should receive a timestamp that is in the future of the time
* before the event was sent.