V4L/DVB (11174): pvrusb2: Implement reporting of connected sub-devices

The pvrusb2 driver has a function that reports internal state.  It can
be accessed from either the debug interface or as the result of a v4l
log status request.  This change adds information listing sub-devices
to the report.

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/media/video/pvrusb2/pvrusb2-hdw.c b/drivers/media/video/pvrusb2/pvrusb2-hdw.c
index 2f9667e62bb1..bd4e374e37f8 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-hdw.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-hdw.c
@@ -4779,6 +4779,29 @@ static unsigned int pvr2_hdw_report_unlocked(struct pvr2_hdw *hdw,int which,
                         stats.buffers_processed,
                         stats.buffers_failed);
         }
+        case 6: {
+                struct v4l2_subdev *sd;
+                unsigned int tcnt = 0;
+                unsigned int ccnt;
+                const char *p;
+                unsigned int id;
+                ccnt = scnprintf(buf,
+                                 acnt,
+                                 "Associted v4l2_subdev drivers:");
+                tcnt += ccnt;
+                v4l2_device_for_each_subdev(sd, &hdw->v4l2_dev) {
+                        id = sd->grp_id;
+                        p = NULL;
+                        if (id < ARRAY_SIZE(module_names)) {
+                                p = module_names[id];
+                        }
+                        if (!p) p = "(unknown)";
+                        ccnt = scnprintf(buf + tcnt,
+                                         acnt - tcnt,
+                                         " %s (%u)", p, id);
+                }
+                return tcnt;
+        }
         default: break;
         }
         return 0;