V4L/DVB (9072): S2API: Add DTV_API_VERSION command

This allows application developers to query the dvb-core API version
dynamically, helping developers understand whether certain features
will be available.

Signed-off-by: Steven Toth <stoth@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index 0ef9c2a2af87..4c3f0d7e355c 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -40,6 +40,7 @@
 
 #include "dvb_frontend.h"
 #include "dvbdev.h"
+#include <linux/dvb/version.h>
 
 static int dvb_frontend_debug;
 static int dvb_shutdown_timeout;
@@ -836,6 +837,11 @@ struct dtv_cmds_h dtv_cmds[] = {
                 .set    = 0,
                 .buffer = 1,
         },
+        [DTV_API_VERSION] = {
+                .name   = "DTV_API_VERSION",
+                .cmd    = DTV_API_VERSION,
+                .set    = 0,
+        },
 };
 
 void dtv_property_dump(struct dtv_property *tvp)
@@ -1104,6 +1110,9 @@ int dtv_property_process_get(struct dvb_frontend *fe, struct dtv_property *tvp,
         case DTV_TONE:
                 tvp->u.data = fe->dtv_property_cache.sectone;
                 break;
+        case DTV_API_VERSION:
+                tvp->u.data = (DVB_API_VERSION << 8) | DVB_API_VERSION_MINOR;
+                break;
         default:
                 r = -1;
         }