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authorLaurent Pinchart <laurent.pinchart@linaro.org>2015-04-25 01:06:31 +0200
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2016-04-13 22:23:37 +0200
commit9b02cbb3ede89b5cd84bbe4ef493bd130d76b070 (patch)
tree6684f6764138715156ea82e1555dc0ed834f3115 /drivers
parent[media] media: Rename is_media_entity_v4l2_io to is_media_entity_v4l2_video_d... (diff)
downloadlinux-9b02cbb3ede89b5cd84bbe4ef493bd130d76b070.tar.xz
linux-9b02cbb3ede89b5cd84bbe4ef493bd130d76b070.zip
[media] v4l: subdev: Add pad config allocator and init
Add a new subdev operation to initialize a subdev pad config array, and a helper function to allocate and initialize the array. This can be used by bridge drivers to implement try format based on subdev pad operations. Signed-off-by: Laurent Pinchart <laurent.pinchart@linaro.org> Acked-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/media/v4l2-core/v4l2-subdev.c39
1 files changed, 35 insertions, 4 deletions
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 0fa60801a428..224ea6028b55 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -35,9 +35,11 @@
static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
{
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
- fh->pad = kzalloc(sizeof(*fh->pad) * sd->entity.num_pads, GFP_KERNEL);
- if (fh->pad == NULL)
- return -ENOMEM;
+ if (sd->entity.num_pads) {
+ fh->pad = v4l2_subdev_alloc_pad_config(sd);
+ if (fh->pad == NULL)
+ return -ENOMEM;
+ }
#endif
return 0;
}
@@ -45,7 +47,7 @@ static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
static void subdev_fh_free(struct v4l2_subdev_fh *fh)
{
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
- kfree(fh->pad);
+ v4l2_subdev_free_pad_config(fh->pad);
fh->pad = NULL;
#endif
}
@@ -569,6 +571,35 @@ int v4l2_subdev_link_validate(struct media_link *link)
sink, link, &source_fmt, &sink_fmt);
}
EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
+
+struct v4l2_subdev_pad_config *
+v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd)
+{
+ struct v4l2_subdev_pad_config *cfg;
+ int ret;
+
+ if (!sd->entity.num_pads)
+ return NULL;
+
+ cfg = kcalloc(sd->entity.num_pads, sizeof(*cfg), GFP_KERNEL);
+ if (!cfg)
+ return NULL;
+
+ ret = v4l2_subdev_call(sd, pad, init_cfg, cfg);
+ if (ret < 0 && ret != -ENOIOCTLCMD) {
+ kfree(cfg);
+ return NULL;
+ }
+
+ return cfg;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_pad_config);
+
+void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg)
+{
+ kfree(cfg);
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_free_pad_config);
#endif /* CONFIG_MEDIA_CONTROLLER */
void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)