From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Add a is_media_entity_v4l2_io to v4l2-common.h (since this is V4L2
specific) that checks if the entity is a video_device AND if it does
I/O.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-common.c | 21 +++++++++++++++++++++
include/media/v4l2-common.h | 12 ++++++++++++
2 files changed, 33 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
index 5b808500e7e7..3c57d51d3e90 100644
--- a/drivers/media/v4l2-core/v4l2-common.c
+++ b/drivers/media/v4l2-core/v4l2-common.c
@@ -405,3 +405,24 @@ void v4l2_get_timestamp(struct timeval *tv)
tv->tv_usec = ts.tv_nsec / NSEC_PER_USEC;
}
EXPORT_SYMBOL_GPL(v4l2_get_timestamp);
+
+#if defined(CONFIG_MEDIA_CONTROLLER)
+bool is_media_entity_v4l2_io(struct media_entity *entity)
+{
+ struct video_device *vdev;
+
+ if (!is_media_entity_v4l2_video_device(entity))
+ return false;
+ vdev = container_of(entity, struct video_device, entity);
+ /*
+ * For now assume that is device_caps == 0, then I/O is available
+ * unless it is a radio device.
+ * Eventually all drivers should set vdev->device_caps and then
+ * this assumption should be removed.
+ */
+ if (vdev->device_caps == 0)
+ return vdev->vfl_type != VFL_TYPE_RADIO;
+ return vdev->device_caps & (V4L2_CAP_READWRITE | V4L2_CAP_STREAMING);
+}
+EXPORT_SYMBOL_GPL(is_media_entity_v4l2_io);
+#endif
diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
index 1cc0c5ba16b3..6dae30493276 100644
--- a/include/media/v4l2-common.h
+++ b/include/media/v4l2-common.h
@@ -189,4 +189,16 @@ const struct v4l2_frmsize_discrete *v4l2_find_nearest_format(
void v4l2_get_timestamp(struct timeval *tv);
+#ifdef CONFIG_MEDIA_CONTROLLER
+/**
+ * is_media_entity_v4l2_io() - Check if the entity is an I/O video_device
+ * @entity: pointer to entity
+ *
+ * Return: true if the entity is an instance of a video_device object (and can
+ * safely be cast to a struct video_device using the container_of() macro) and
+ * can do I/O, or false otherwise.
+ */
+bool is_media_entity_v4l2_io(struct media_entity *entity);
+#endif
+
#endif /* V4L2_COMMON_H_ */
--
2.4.10
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
