From: Mauro Carvalho Chehab <mchehab@s-opensource.com>
To: Linux Doc Mailing List <linux-doc@vger.kernel.org>,
Linux Media Mailing List <linux-media@vger.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>,
Mauro Carvalho Chehab <mchehab@infradead.org>,
linux-kernel@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>,
Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
Hans Verkuil <hans.verkuil@cisco.com>,
Mauro Carvalho Chehab <mchehab@s-opensource.com>
Subject: [PATCH 2/3] media: videodev2: add a flag for vdev-centric devices
Date: Fri, 25 Aug 2017 06:40:06 -0300 [thread overview]
Message-ID: <8d504be517755ee9449a007b5f2de52738c2df63.1503653839.git.mchehab@s-opensource.com> (raw)
In-Reply-To: <cover.1503653839.git.mchehab@s-opensource.com>
In-Reply-To: <cover.1503653839.git.mchehab@s-opensource.com>
From: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
As both vdev-centric and mc-centric devices may implement the
same APIs, we need a flag to allow userspace to distinguish
between them.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
---
Documentation/media/uapi/v4l/open.rst | 6 ++++++
Documentation/media/uapi/v4l/vidioc-querycap.rst | 4 ++++
include/uapi/linux/videodev2.h | 2 ++
3 files changed, 12 insertions(+)
diff --git a/Documentation/media/uapi/v4l/open.rst b/Documentation/media/uapi/v4l/open.rst
index a72d142897c0..eb3f0ec57edb 100644
--- a/Documentation/media/uapi/v4l/open.rst
+++ b/Documentation/media/uapi/v4l/open.rst
@@ -33,6 +33,12 @@ For **vdev-centric** control, the device and their corresponding hardware
pipelines are controlled via the **V4L2 device** node. They may optionally
expose via the :ref:`media controller API <media_controller>`.
+.. note::
+
+ **vdev-centric** devices should report V4L2_VDEV_CENTERED
+ :c:type:`v4l2_capability` flag (see :ref:`VIDIOC_QUERYCAP`).
+
+
For **MC-centric** control, before using the V4L2 device, it is required to
set the hardware pipelines via the
:ref:`media controller API <media_controller>`. For those devices, the
diff --git a/Documentation/media/uapi/v4l/vidioc-querycap.rst b/Documentation/media/uapi/v4l/vidioc-querycap.rst
index 12e0d9a63cd8..4856821b7608 100644
--- a/Documentation/media/uapi/v4l/vidioc-querycap.rst
+++ b/Documentation/media/uapi/v4l/vidioc-querycap.rst
@@ -252,6 +252,10 @@ specification the ioctl returns an ``EINVAL`` error code.
* - ``V4L2_CAP_TOUCH``
- 0x10000000
- This is a touch device.
+ * - ``V4L2_VDEV_CENTERED``
+ - 0x20000000
+ - This is controlled via V4L2 device nodes (radio, video, vbi,
+ sdr
* - ``V4L2_CAP_DEVICE_CAPS``
- 0x80000000
- The driver fills the ``device_caps`` field. This capability can
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 45cf7359822c..d89090d99042 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -460,6 +460,8 @@ struct v4l2_capability {
#define V4L2_CAP_TOUCH 0x10000000 /* Is a touch device */
+#define V4L2_CAP_VDEV_CENTERED 0x20000000 /* V4L2 Device is controlled via V4L2 device devnode */
+
#define V4L2_CAP_DEVICE_CAPS 0x80000000 /* sets device capabilities field */
/*
--
2.13.3
next prev parent reply other threads:[~2017-08-25 9:41 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-25 9:40 [PATCH 0/3] document types of hardware control for V4L2 Mauro Carvalho Chehab
2017-08-25 9:40 ` [PATCH 1/3] media: open.rst: document devnode-centric and mc-centric types Mauro Carvalho Chehab
2017-08-25 10:32 ` Hans Verkuil
2017-08-25 11:08 ` Sakari Ailus
2017-08-25 13:11 ` Laurent Pinchart
2017-08-25 13:38 ` Mauro Carvalho Chehab
2017-08-25 13:57 ` Laurent Pinchart
2017-08-25 14:02 ` Hans Verkuil
2017-08-25 9:40 ` Mauro Carvalho Chehab [this message]
2017-08-25 9:44 ` [PATCH 2/3] media: videodev2: add a flag for vdev-centric devices Hans Verkuil
2017-08-25 10:06 ` Mauro Carvalho Chehab
2017-08-25 10:13 ` Hans Verkuil
2017-08-25 10:35 ` Mauro Carvalho Chehab
2017-08-25 10:42 ` Hans Verkuil
2017-08-25 10:50 ` Mauro Carvalho Chehab
2017-08-25 10:56 ` Hans Verkuil
2017-08-25 11:15 ` Mauro Carvalho Chehab
2017-08-25 11:30 ` Mauro Carvalho Chehab
2017-08-25 11:35 ` Mauro Carvalho Chehab
2017-08-25 11:42 ` Hans Verkuil
2017-08-25 13:27 ` Laurent Pinchart
2017-08-25 9:40 ` [PATCH 3/3] media: add V4L2_CAP_VDEV_CENTERED flag on vdev-centric drivers Mauro Carvalho Chehab
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