Add missing files from last commit.

src/device.h

@@ -0,0 +1,12 @@
+typedef struct device_t
+{
+        char name[50];
+        void *(*init)();
+        void (*close)(void *priv);
+        void (*speed_changed)(void *priv);
+} device_t;
+
+void device_init();
+void device_add(device_t *d);
+void device_close_all();
+void device_speed_changed();