V4L/DVB: V4L: Events: Support event handling in do_ioctl

Add support for event handling to do_ioctl.

Signed-off-by: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/v4l2-fh.c b/drivers/media/video/v4l2-fh.c
index aab2fb6..d78f184 100644 (file)
--- a/drivers/media/video/v4l2-fh.c
+++ b/drivers/media/video/v4l2-fh.c
@@ -34,7 +34,16 @@ int v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev)
        INIT_LIST_HEAD(&fh->list);
        set_bit(V4L2_FL_USES_V4L2_FH, &fh->vdev->flags);
 
-       return v4l2_event_init(fh);
+       /*
+        * fh->events only needs to be initialized if the driver
+        * supports the VIDIOC_SUBSCRIBE_EVENT ioctl.
+        */
+       if (vdev->ioctl_ops && vdev->ioctl_ops->vidioc_subscribe_event)
+               return v4l2_event_init(fh);
+
+       fh->events = NULL;
+
+       return 0;
 }
 EXPORT_SYMBOL_GPL(v4l2_fh_init);
 

diff --git a/drivers/media/video/v4l2-ioctl.c b/drivers/media/video/v4l2-ioctl.c
index 2ceaa15..0eeceae 100644 (file)
--- a/drivers/media/video/v4l2-ioctl.c
+++ b/drivers/media/video/v4l2-ioctl.c
@@ -26,6 +26,8 @@
 #endif
 #include <media/v4l2-common.h>
 #include <media/v4l2-ioctl.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-event.h>
 #include <media/v4l2-chip-ident.h>
 
 #define dbgarg(cmd, fmt, arg...) \
@@ -1951,7 +1953,55 @@ static long __video_do_ioctl(struct file *file,
                }
                break;
        }
+       case VIDIOC_DQEVENT:
+       {
+               struct v4l2_event *ev = arg;
+
+               if (!ops->vidioc_subscribe_event)
+                       break;
+
+               ret = v4l2_event_dequeue(fh, ev, file->f_flags & O_NONBLOCK);
+               if (ret < 0) {
+                       dbgarg(cmd, "no pending events?");
+                       break;
+               }
+               dbgarg(cmd,
+                      "pending=%d, type=0x%8.8x, sequence=%d, "
+                      "timestamp=%lu.%9.9lu ",
+                      ev->pending, ev->type, ev->sequence,
+                      ev->timestamp.tv_sec, ev->timestamp.tv_nsec);
+               break;
+       }
+       case VIDIOC_SUBSCRIBE_EVENT:
+       {
+               struct v4l2_event_subscription *sub = arg;
 
+               if (!ops->vidioc_subscribe_event)
+                       break;
+
+               ret = ops->vidioc_subscribe_event(fh, sub);
+               if (ret < 0) {
+                       dbgarg(cmd, "failed, ret=%ld", ret);
+                       break;
+               }
+               dbgarg(cmd, "type=0x%8.8x", sub->type);
+               break;
+       }
+       case VIDIOC_UNSUBSCRIBE_EVENT:
+       {
+               struct v4l2_event_subscription *sub = arg;
+
+               if (!ops->vidioc_unsubscribe_event)
+                       break;
+
+               ret = ops->vidioc_unsubscribe_event(fh, sub);
+               if (ret < 0) {
+                       dbgarg(cmd, "failed, ret=%ld", ret);
+                       break;
+               }
+               dbgarg(cmd, "type=0x%8.8x", sub->type);
+               break;
+       }
        default:
        {
                if (!ops->vidioc_default)

diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h
index e8ba0f2..06daa6e 100644 (file)
--- a/include/media/v4l2-ioctl.h
+++ b/include/media/v4l2-ioctl.h
@@ -21,6 +21,8 @@
 #include <linux/videodev2.h>
 #endif
 
+struct v4l2_fh;
+
 struct v4l2_ioctl_ops {
        /* ioctl callbacks */
 
@@ -254,6 +256,11 @@ struct v4l2_ioctl_ops {
        int (*vidioc_g_dv_timings) (struct file *file, void *fh,
                                    struct v4l2_dv_timings *timings);
 
+       int (*vidioc_subscribe_event)  (struct v4l2_fh *fh,
+                                       struct v4l2_event_subscription *sub);
+       int (*vidioc_unsubscribe_event)(struct v4l2_fh *fh,
+                                       struct v4l2_event_subscription *sub);
+
        /* For other private ioctls */
        long (*vidioc_default)         (struct file *file, void *fh,
                                        int cmd, void *arg);