SIM: pushed transfer stub for ms5611_sim

The MS5611_SIM class is supposed to simulate data from a real
ms5611. An externl simulator could provide an interface to
call to get data that would be returned from a transfer() call.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/drivers/device/sim.h

@@ -97,8 +97,8 @@ protected:
 	 * @return		OK if the transfer was successful, -errno
 	 *			otherwise.
 	 */
-	virtual int		transfer(const uint8_t *send, unsigned send_len,
-				 uint8_t *recv, unsigned recv_len);
+	virtual int	transfer(const uint8_t *send, unsigned send_len,
+					 uint8_t *recv, unsigned recv_len);
 
 private:
 	uint16_t		_address;

src/drivers/ms5611/ms5611_sim.cpp

@@ -65,6 +65,8 @@ public:
 	virtual int	dev_read(unsigned offset, void *data, unsigned count);
 	virtual int	dev_ioctl(unsigned operation, unsigned &arg);
 
+	virtual int	transfer(const uint8_t *send, unsigned send_len,
+				 uint8_t *recv, unsigned recv_len);
 private:
 	ms5611::prom_u	&_prom;
 
@@ -192,3 +194,12 @@ MS5611_SIM::_read_prom()
 	// TODO input simlation data
 	return ret;
 }
+
+int
+MS5611_SIM::transfer(const uint8_t *send, unsigned send_len,
+				 uint8_t *recv, unsigned recv_len)
+{
+	// TODO add Simulation data connection so calls retrieve
+	// data from the simulator
+	return 0;
+}