hidl: biometrics: fingerprint: Add support for device specific UDFPS libs

Change-Id: I8f29d58b178aa8ff420204f790c6952fdf4ade58

hidl/biometrics/fingerprint/Android.bp

@@ -14,12 +14,14 @@ cc_binary {
     relative_install_path: "hw",
     srcs: [
         "BiometricsFingerprint.cpp",
+        "UdfpsHandler.cpp",
         "service.cpp",
     ],
 
     shared_libs: [
         "libbase",
         "libcutils",
+        "libdl",
         "liblog",
         "libhidlbase",
         "libhardware",

hidl/biometrics/fingerprint/BiometricsFingerprint.cpp

@@ -12,6 +12,7 @@
 #include <android-base/strings.h>
 #include <hardware/hardware.h>
 #include "BiometricsFingerprint.h"
+#include "UdfpsHandler.h"
 
 #include <android-base/properties.h>
 #include <inttypes.h>
@@ -48,7 +49,11 @@ using ::android::base::StartsWith;
 
 BiometricsFingerprint* BiometricsFingerprint::sInstance = nullptr;
 
-BiometricsFingerprint::BiometricsFingerprint() : mClientCallback(nullptr), mDevice(nullptr) {
+BiometricsFingerprint::BiometricsFingerprint()
+    : mClientCallback(nullptr),
+      mDevice(nullptr),
+      mUdfpsHandlerFactory(nullptr),
+      mUdfpsHandler(nullptr) {
     sInstance = this;  // keep track of the most recent instance
     for (auto& [class_name, is_udfps] : kModules) {
         mDevice = openHal(class_name);
@@ -69,11 +74,26 @@ BiometricsFingerprint::BiometricsFingerprint() : mClientCallback(nullptr), mDevi
 
     if (mIsUdfps) {
         SetProperty("ro.hardware.fp.udfps", "true");
+
+        mUdfpsHandlerFactory = getUdfpsHandlerFactory();
+        if (!mUdfpsHandlerFactory) {
+            ALOGE("Can't get UdfpsHandlerFactory");
+        } else {
+            mUdfpsHandler = mUdfpsHandlerFactory->create();
+            if (!mUdfpsHandler) {
+                ALOGE("Can't create UdfpsHandler");
+            } else {
+                mUdfpsHandler->init(mDevice);
+            }
+        }
     }
 }
 
 BiometricsFingerprint::~BiometricsFingerprint() {
     ALOGV("~BiometricsFingerprint()");
+    if (mUdfpsHandler) {
+        mUdfpsHandlerFactory->destroy(mUdfpsHandler);
+    }
     if (mDevice == nullptr) {
         ALOGE("No valid device");
         return;
@@ -245,12 +265,19 @@ Return<bool> BiometricsFingerprint::isUdfps(uint32_t /*sensorId*/) {
     return mIsUdfps;
 }
 
-Return<void> BiometricsFingerprint::onFingerDown(uint32_t /*x*/, uint32_t /*y*/, float /*minor*/,
-                                                 float /*major*/) {
+Return<void> BiometricsFingerprint::onFingerDown(uint32_t x, uint32_t y, float minor, float major) {
+    if (mUdfpsHandler) {
+        mUdfpsHandler->onFingerDown(x, y, minor, major);
+    }
+
     return Void();
 }
 
 Return<void> BiometricsFingerprint::onFingerUp() {
+    if (mUdfpsHandler) {
+        mUdfpsHandler->onFingerUp();
+    }
+
     return Void();
 }
 

hidl/biometrics/fingerprint/BiometricsFingerprint.h

@@ -13,6 +13,7 @@
 #include <hidl/MQDescriptor.h>
 #include <hidl/Status.h>
 #include <log/log.h>
+#include "UdfpsHandler.h"
 #include "fingerprint.h"
 
 namespace android {
@@ -75,6 +76,8 @@ struct BiometricsFingerprint : public IBiometricsFingerprint {
     sp<IBiometricsFingerprintClientCallback> mClientCallback;
     fingerprint_device_t* mDevice;
     bool mIsUdfps;
+    UdfpsHandlerFactory* mUdfpsHandlerFactory;
+    UdfpsHandler* mUdfpsHandler;
 };
 
 }  // namespace implementation

hidl/biometrics/fingerprint/UdfpsHandler.cpp

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2022 The LineageOS Project
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "UdfpsHandler.h"
+#include <dlfcn.h>
+
+#define UDFPS_HANDLER_LIB_NAME "libudfpshandler.so"
+#define UDFPS_HANDLER_FACTORY "UDFPS_HANDLER_FACTORY"
+
+UdfpsHandlerFactory* getUdfpsHandlerFactory() {
+    void* libudfpshander;
+    UdfpsHandlerFactory* factory_handler;
+
+    libudfpshander = dlopen(UDFPS_HANDLER_LIB_NAME, RTLD_LAZY);
+    if (!libudfpshander) {
+        goto error;
+    }
+
+    factory_handler = (UdfpsHandlerFactory*)dlsym(libudfpshander, UDFPS_HANDLER_FACTORY);
+    if (!factory_handler) {
+        goto error;
+    }
+
+    return factory_handler;
+
+error:
+    if (libudfpshander) {
+        dlclose(libudfpshander);
+    }
+
+    return nullptr;
+}

hidl/biometrics/fingerprint/include/UdfpsHandler.h

@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2022 The LineageOS Project
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include "fingerprint.h"
+
+class UdfpsHandler {
+  public:
+    virtual ~UdfpsHandler() = default;
+
+    virtual void init(fingerprint_device_t *device) = 0;
+    virtual void onFingerDown(uint32_t x, uint32_t y, float minor, float major) = 0;
+    virtual void onFingerUp() = 0;
+};
+
+struct UdfpsHandlerFactory {
+    UdfpsHandler* (*create)();
+    void (*destroy)(UdfpsHandler* handler);
+};
+
+UdfpsHandlerFactory *getUdfpsHandlerFactory();