[doc] Expand Doxuygen documentation for osmo_prim

Also, make sure prim.c is actually part of the 'prim' module.

Change-Id: I4363e46a5f606eb2114a9cc1d2086007eaa58d31

1 files changed, 5 insertions, 1 deletions

diff --git a/src/prim.c b/src/prim.c
index 20355813..d18dbd76 100644
--- a/src/prim.c
+++ b/src/prim.c
@@ -1,4 +1,6 @@
-/*! \file prim.c */
+/*! \addtogroup prim
+ *  @{
+ *  \file prim.c */
 
 #include <osmocom/core/utils.h>
 #include <osmocom/core/prim.h>
@@ -30,3 +32,5 @@ uint32_t osmo_event_for_prim(const struct osmo_prim_hdr *oph,
 	}
 	return OSMO_NO_EVENT;
 }
+
+/*! @} */