v4l2_subdev_link_validate() is the default op for validating a link. In V4L2
subdev context, it is used to call a pad op which performs the proper link
check without much extra work.
Signed-off-by: Sakari Ailus <sakari.ai...@iki.fi>
---
drivers/media/video/v4l2-subdev.c | 62 +++++++++++++++++++++++++++++++++++++
include/media/v4l2-subdev.h | 10 ++++++
2 files changed, 72 insertions(+), 0 deletions(-)
diff --git a/drivers/media/video/v4l2-subdev.c
b/drivers/media/video/v4l2-subdev.c
index 836270d..4b329a0 100644
--- a/drivers/media/video/v4l2-subdev.c
+++ b/drivers/media/video/v4l2-subdev.c
@@ -367,6 +367,68 @@ const struct v4l2_file_operations v4l2_subdev_fops = {
.poll = subdev_poll,
};
+#ifdef CONFIG_MEDIA_CONTROLLER
+int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
+ struct media_link *link,
+ struct v4l2_subdev_format *source_fmt,
+ struct v4l2_subdev_format *sink_fmt)
+{
+ if (source_fmt->format.width != sink_fmt->format.width
+ || source_fmt->format.height != sink_fmt->format.height
+ || source_fmt->format.code != sink_fmt->format.code)
+ return -EINVAL;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
+
+static struct v4l2_subdev_format
+*v4l2_subdev_link_validate_get_format(struct media_pad *pad,
+ struct v4l2_subdev_format *fmt)
+{
+ int rval;
+
+ switch (media_entity_type(pad->entity)) {
+ case MEDIA_ENT_T_V4L2_SUBDEV:
+ fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
+ fmt->pad = pad->index;
+ rval = v4l2_subdev_call(media_entity_to_v4l2_subdev(
+ pad->entity),
+ pad, get_fmt, NULL, fmt);
+ if (rval < 0)
+ return NULL;
+ return fmt;
+ case MEDIA_ENT_T_DEVNODE_V4L:
+ return NULL;
+ default:
+ BUG();
+ }
+}
+
+int v4l2_subdev_link_validate(struct media_link *link)
+{
+ struct v4l2_subdev *sink = NULL, *source = NULL;
+ struct v4l2_subdev_format _sink_fmt, _source_fmt;
+ struct v4l2_subdev_format *sink_fmt, *source_fmt;
+
+ source_fmt = v4l2_subdev_link_validate_get_format(
+ link->source, &_source_fmt);
+ sink_fmt = v4l2_subdev_link_validate_get_format(
+ link->sink, &_sink_fmt);
+
+ if (source_fmt)
+ source = media_entity_to_v4l2_subdev(link->source->entity);
+ if (sink_fmt)
+ sink = media_entity_to_v4l2_subdev(link->sink->entity);
+
+ if (source_fmt && sink_fmt)
+ return v4l2_subdev_call(sink, pad, link_validate, link,
+ source_fmt, sink_fmt);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
+#endif /* CONFIG_MEDIA_CONTROLLER */
+
void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops
*ops)
{
INIT_LIST_HEAD(&sd->list);
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index feab950..436e6f4 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -470,6 +470,11 @@ struct v4l2_subdev_pad_ops {
struct v4l2_subdev_selection *sel);
int (*set_selection)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
struct v4l2_subdev_selection *sel);
+#ifdef CONFIG_MEDIA_CONTROLLER
+ int (*link_validate)(struct v4l2_subdev *sd, struct media_link *link,
+ struct v4l2_subdev_format *source_fmt,
+ struct v4l2_subdev_format *sink_fmt);
+#endif /* CONFIG_MEDIA_CONTROLLER */
};
struct v4l2_subdev_ops {
@@ -606,6 +611,11 @@ static inline void *v4l2_get_subdev_hostdata(const struct
v4l2_subdev *sd)
return sd->host_priv;
}
+int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
+ struct media_link *link,
+ struct v4l2_subdev_format *source_fmt,
+ struct v4l2_subdev_format *sink_fmt);
+int v4l2_subdev_link_validate(struct media_link *link);
void v4l2_subdev_init(struct v4l2_subdev *sd,
const struct v4l2_subdev_ops *ops);
--
1.7.2.5
--
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