gps: gpsd: Adding gpsd_iface to interface with gpsd.

The gpsd_iface class might be useful for more than just e3x0,
it therefore belongs into lib/usrp instead of lib/usrp/e300.

A new UHD component is being registered, to cope with the additional
dependency. If libgps is not found, UHD and E300 will be compiled
without GPS support.

This has several consequences:
- The E310 GPSDO should now work transparently over network
- Users can use the GPS through gpsd for other applications
  *while* running UHD applications
- We now have a dependency on libgps

We need currently at least version 3.11 (while running 3.14),
on the device. Older versions do work if 3.10 runs on both
sides e.g

Reviewed-by: Martin Braun <martin.braun@ettus.com>
Reviewed-by: Ashish Chaudhari <ashish.chaudhari@ettus.com>
Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/host/lib/usrp/e300/e300_impl.hpp b/host/lib/usrp/e300/e300_impl.hpp
index d61b95387..8aff51466 100644
--- a/host/lib/usrp/e300/e300_impl.hpp
+++ b/host/lib/usrp/e300/e300_impl.hpp
@@ -47,7 +47,11 @@
 #include "e300_i2c.hpp"
 #include "e300_eeprom_manager.hpp"
 #include "e300_sensor_manager.hpp"
-#include "e300_ublox_control.hpp"
+
+/* if we don't compile with gpsd support, don't bother */
+#ifdef E300_GPSD
+#include "gpsd_iface.hpp"
+#endif
 
 namespace uhd { namespace usrp { namespace e300 {
 
@@ -299,7 +303,10 @@ private: // members
     std::string                            _idle_image;
     bool                                   _do_not_reload;
     gpio_t                                 _misc;
-    gps::ublox::ubx::control::sptr _gps;
+#ifdef E300_GPSD
+    gpsd_iface::sptr                       _gps;
+    static const size_t                    _GPS_TIMEOUT = 5;
+#endif
 };
 
 }}} // namespace