From: Hans Verkuil <hans.verkuil@cisco.com>
Date: Wed, 23 May 2018 11:11:06 +0000 (-0400)
Subject: media: v4l2-device.h: add v4l2_device_supports_requests() helper
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=93a9d9008d3c963d5d12c56460b5e1d93dad3ea8;p=linux.git

media: v4l2-device.h: add v4l2_device_supports_requests() helper

Add a simple helper function that tests if the driver supports
the request API.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
---

diff --git a/include/media/v4l2-device.h b/include/media/v4l2-device.h
index b330e4a08a6b8..ac7677a183ff2 100644
--- a/include/media/v4l2-device.h
+++ b/include/media/v4l2-device.h
@@ -211,6 +211,17 @@ static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
 		sd->v4l2_dev->notify(sd, notification, arg);
 }
 
+/**
+ * v4l2_device_supports_requests - Test if requests are supported.
+ *
+ * @v4l2_dev: pointer to struct v4l2_device
+ */
+static inline bool v4l2_device_supports_requests(struct v4l2_device *v4l2_dev)
+{
+	return v4l2_dev->mdev && v4l2_dev->mdev->ops &&
+	       v4l2_dev->mdev->ops->req_queue;
+}
+
 /* Helper macros to iterate over all subdevs. */
 
 /**