r8s: sensors: Implement UDFPS sensor

Change-Id: I8b65e3196a7d6f158f4ff589b9755cf7c7e51c92

overlay/frameworks/base/core/res/res/values/config.xml

@@ -42,4 +42,7 @@
          @see https://www.w3.org/TR/SVG/paths.html#PathData
          -->
     <string name="config_mainBuiltInDisplayCutout">M 0,0 H -62 V 88 H 62 V 0 H 0 Z</string>
+
+    <!-- Type of the udfps long press sensor. Empty if long press is not supported. -->
+    <string name="config_dozeUdfpsLongPressSensorType" translatable="false">org.lineageos.sensor.udfps</string>
 </resources>

sensors/Sensor.h

@@ -115,6 +115,17 @@ class SysfsPollingOneShotSensor : public OneShotSensor {
     int mPollFd;
 };
 
+const std::string kTsUdfpsPressedPath = "/sys/class/sec/tsp/fod_pressed";
+
+class UdfpsSensor : public SysfsPollingOneShotSensor {
+  public:
+    UdfpsSensor(int32_t sensorHandle, ISensorsEventCallback* callback)
+        : SysfsPollingOneShotSensor(
+              sensorHandle, callback, kTsUdfpsPressedPath,
+              "UDFPS Sensor", "org.lineageos.sensor.udfps",
+              static_cast<SensorType>(static_cast<int32_t>(SensorType::DEVICE_PRIVATE_BASE) + 2)) {}
+};
+
 }  // namespace implementation
 }  // namespace subhal
 }  // namespace V2_1

sensors/SensorsSubHal.cpp

@@ -32,7 +32,9 @@ namespace implementation {
 using ::android::hardware::Void;
 using ::android::hardware::sensors::V2_0::implementation::ScopedWakelock;
 
-SensorsSubHal::SensorsSubHal() : mCallback(nullptr), mNextHandle(1) {}
+SensorsSubHal::SensorsSubHal() : mCallback(nullptr), mNextHandle(1) {
+    AddSensor<UdfpsSensor>();
+}
 
 Return<void> SensorsSubHal::getSensorsList_2_1(ISensors::getSensorsList_2_1_cb _hidl_cb) {
     std::vector<SensorInfo> sensors;