eqs: sensors: Create sysfs polling one shot sensor

Change-Id: Ie78d7729201836bacd65a57f76e22adb61159192

sensors/Sensor.h

@@ -17,8 +17,12 @@
 #pragma once
 
 #include <android/hardware/sensors/2.1/types.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <unistd.h>
 
 #include <condition_variable>
+#include <fstream>
 #include <memory>
 #include <mutex>
 #include <thread>
@@ -88,6 +92,34 @@ class OneShotSensor : public Sensor {
     virtual Result flush() override { return Result::BAD_VALUE; }
 };
 
+class SysfsPollingOneShotSensor : public OneShotSensor {
+  public:
+    SysfsPollingOneShotSensor(int32_t sensorHandle, ISensorsEventCallback* callback,
+                              const std::string& pollPath, const std::string& enablePath,
+                              const std::string& name, const std::string& typeAsString,
+                              SensorType type);
+    virtual ~SysfsPollingOneShotSensor() override;
+
+    virtual void activate(bool enable) override;
+    virtual void activate(bool enable, bool notify, bool lock);
+    virtual void writeEnable(bool enable);
+    virtual void setOperationMode(OperationMode mode) override;
+    virtual std::vector<Event> readEvents() override;
+    virtual void fillEventData(Event& event);
+
+  protected:
+    virtual void run() override;
+
+    std::ofstream mEnableStream;
+
+  private:
+    void interruptPoll();
+
+    struct pollfd mPolls[2];
+    int mWaitPipeFd[2];
+    int mPollFd;
+};
+
 }  // namespace implementation
 }  // namespace subhal
 }  // namespace V2_1