From: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
To: linux-media@vger.kernel.org, sakari.ailus@linux.intel.com,
Jacopo Mondi <jacopo+renesas@jmondi.org>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
niklas.soderlund+renesas@ragnatech.se,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Hans Verkuil <hverkuil-cisco@xs4all.nl>,
Kishon Vijay Abraham <kishon@ti.com>,
satish.nagireddy@getcruise.com, Tomasz Figa <tfiga@chromium.org>
Cc: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Subject: [PATCH v14 19/34] media: Documentation: Add GS_ROUTING documentation
Date: Wed, 31 Aug 2022 17:13:42 +0300 [thread overview]
Message-ID: <20220831141357.1396081-20-tomi.valkeinen@ideasonboard.com> (raw)
In-Reply-To: <20220831141357.1396081-1-tomi.valkeinen@ideasonboard.com>
From: Jacopo Mondi <jacopo+renesas@jmondi.org>
Add documentation for VIDIOC_SUBDEV_G/S_ROUTING ioctl and add
description of multiplexed media pads and internal routing to the
V4L2-subdev documentation section.
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
.../userspace-api/media/v4l/dev-subdev.rst | 2 +
.../userspace-api/media/v4l/user-func.rst | 1 +
.../media/v4l/vidioc-subdev-g-routing.rst | 150 ++++++++++++++++++
3 files changed, 153 insertions(+)
create mode 100644 Documentation/userspace-api/media/v4l/vidioc-subdev-g-routing.rst
diff --git a/Documentation/userspace-api/media/v4l/dev-subdev.rst b/Documentation/userspace-api/media/v4l/dev-subdev.rst
index fd1de0a73a9f..a67c2749089a 100644
--- a/Documentation/userspace-api/media/v4l/dev-subdev.rst
+++ b/Documentation/userspace-api/media/v4l/dev-subdev.rst
@@ -29,6 +29,8 @@ will feature a character device node on which ioctls can be called to
- negotiate image formats on individual pads
+- inspect and modify internal data routing between pads of the same entity
+
Sub-device character device nodes, conventionally named
``/dev/v4l-subdev*``, use major number 81.
diff --git a/Documentation/userspace-api/media/v4l/user-func.rst b/Documentation/userspace-api/media/v4l/user-func.rst
index 53e604bd7d60..228c1521f190 100644
--- a/Documentation/userspace-api/media/v4l/user-func.rst
+++ b/Documentation/userspace-api/media/v4l/user-func.rst
@@ -70,6 +70,7 @@ Function Reference
vidioc-subdev-g-crop
vidioc-subdev-g-fmt
vidioc-subdev-g-frame-interval
+ vidioc-subdev-g-routing
vidioc-subdev-g-selection
vidioc-subdev-querycap
vidioc-subscribe-event
diff --git a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-routing.rst b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-routing.rst
new file mode 100644
index 000000000000..a0d9c79e162f
--- /dev/null
+++ b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-routing.rst
@@ -0,0 +1,150 @@
+.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
+.. c:namespace:: V4L
+
+.. _VIDIOC_SUBDEV_G_ROUTING:
+
+******************************************************
+ioctl VIDIOC_SUBDEV_G_ROUTING, VIDIOC_SUBDEV_S_ROUTING
+******************************************************
+
+Name
+====
+
+VIDIOC_SUBDEV_G_ROUTING - VIDIOC_SUBDEV_S_ROUTING - Get or set routing between streams of media pads in a media entity.
+
+
+Synopsis
+========
+
+.. c:function:: int ioctl( int fd, VIDIOC_SUBDEV_G_ROUTING, struct v4l2_subdev_routing *argp )
+ :name: VIDIOC_SUBDEV_G_ROUTING
+
+.. c:function:: int ioctl( int fd, VIDIOC_SUBDEV_S_ROUTING, struct v4l2_subdev_routing *argp )
+ :name: VIDIOC_SUBDEV_S_ROUTING
+
+
+Arguments
+=========
+
+``fd``
+ File descriptor returned by :ref:`open() <func-open>`.
+
+``argp``
+ Pointer to struct :c:type:`v4l2_subdev_routing`.
+
+
+Description
+===========
+
+These ioctls are used to get and set the routing in a media entity.
+The routing configuration determines the flows of data inside an entity.
+
+Drivers report their current routing tables using the
+``VIDIOC_SUBDEV_G_ROUTING`` ioctl and application may enable or disable routes
+with the ``VIDIOC_SUBDEV_S_ROUTING`` ioctl, by adding or removing routes and
+setting or clearing flags of the ``flags`` field of a
+struct :c:type:`v4l2_subdev_route`.
+
+All stream configurations are reset when ``VIDIOC_SUBDEV_S_ROUTING`` is called. This
+means that the userspace mut reconfigure all streams after calling the ioctl
+with e.g. ``VIDIOC_SUBDEV_S_FMT``.
+
+A special case for routing are routes marked with
+``V4L2_SUBDEV_ROUTE_FL_SOURCE`` flag. These routes are used to describe
+source endpoints on sensors and the sink fields are unused.
+
+When inspecting routes through ``VIDIOC_SUBDEV_G_ROUTING`` and the application
+provided ``num_routes`` is not big enough to contain all the available routes
+the subdevice exposes, drivers return the ENOSPC error code and adjust the
+value of the ``num_routes`` field. Application should then reserve enough memory
+for all the route entries and call ``VIDIOC_SUBDEV_G_ROUTING`` again.
+
+.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
+
+.. c:type:: v4l2_subdev_routing
+
+.. flat-table:: struct v4l2_subdev_routing
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u32
+ - ``which``
+ - Format to modified, from enum
+ :ref:`v4l2_subdev_format_whence <v4l2-subdev-format-whence>`.
+ * - struct :c:type:`v4l2_subdev_route`
+ - ``routes[]``
+ - Array of struct :c:type:`v4l2_subdev_route` entries
+ * - __u32
+ - ``num_routes``
+ - Number of entries of the routes array
+ * - __u32
+ - ``reserved``\ [5]
+ - Reserved for future extensions. Applications and drivers must set
+ the array to zero.
+
+.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
+
+.. c:type:: v4l2_subdev_route
+
+.. flat-table:: struct v4l2_subdev_route
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u32
+ - ``sink_pad``
+ - Sink pad number.
+ * - __u32
+ - ``sink_stream``
+ - Sink pad stream number.
+ * - __u32
+ - ``source_pad``
+ - Source pad number.
+ * - __u32
+ - ``source_stream``
+ - Source pad stream number.
+ * - __u32
+ - ``flags``
+ - Route enable/disable flags
+ :ref:`v4l2_subdev_routing_flags <v4l2-subdev-routing-flags>`.
+ * - __u32
+ - ``reserved``\ [5]
+ - Reserved for future extensions. Applications and drivers must set
+ the array to zero.
+
+.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
+
+.. _v4l2-subdev-routing-flags:
+
+.. flat-table:: enum v4l2_subdev_routing_flags
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 3 1 4
+
+ * - V4L2_SUBDEV_ROUTE_FL_ACTIVE
+ - 0
+ - The route is enabled. Set by applications.
+ * - V4L2_SUBDEV_ROUTE_FL_IMMUTABLE
+ - 1
+ - The route is immutable. Set by the driver.
+ * - V4L2_SUBDEV_ROUTE_FL_SOURCE
+ - 2
+ - The route is a source route, and the ``sink_pad`` and ``sink_stream``
+ fields are unused. Set by the driver.
+
+Return Value
+============
+
+On success 0 is returned, on error -1 and the ``errno`` variable is set
+appropriately. The generic error codes are described at the
+:ref:`Generic Error Codes <gen-errors>` chapter.
+
+ENOSPC
+ The number of provided route entries is less than the available ones.
+
+EINVAL
+ The sink or source pad identifiers reference a non-existing pad, or reference
+ pads of different types (ie. the sink_pad identifiers refers to a source pad)
+ or the sink or source stream identifiers reference a non-existing stream on
+ the sink or source pad.
--
2.34.1
next prev parent reply other threads:[~2022-08-31 14:16 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-31 14:13 [PATCH v14 00/34] Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 01/34] media: Documentation: mc: add definitions for stream and pipeline Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 02/34] media: media-entity.h: add include for min() Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 03/34] media: subdev: increase V4L2_FRAME_DESC_ENTRY_MAX to 8 Tomi Valkeinen
2022-09-29 6:48 ` Bingbu Cao
2022-10-03 11:32 ` Tomi Valkeinen
2022-10-13 7:31 ` Bingbu Cao
2022-08-31 14:13 ` [PATCH v14 04/34] media: mc: entity: Rename streaming_count -> start_count Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 05/34] media: mc: entity: Add iterator helper for entity pads Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 06/34] media: mc: entity: Merge media_entity_enum_init and __media_entity_enum_init Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 07/34] media: mc: entity: Move media_entity_get_fwnode_pad() out of graph walk section Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 08/34] media: mc: entity: Add media_entity_pipeline() to access the media pipeline Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 09/34] media: v4l2-dev: Add videodev wrappers for media pipelines Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 10/34] media: drivers: use video device pipeline start/stop Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 11/34] media: drivers: use video_device_pipeline() Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 12/34] media: mc: entity: add alloc variant of pipeline_start Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 13/34] media: drivers: use video_device_pipeline_alloc_start() Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 14/34] media: mc: entity: Rewrite media_pipeline_start() Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 15/34] media: mc: entity: Add has_pad_interdep entity operation Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 16/34] media: mc: convert pipeline funcs to take media_pad Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 17/34] media: add V4L2_SUBDEV_FL_STREAMS Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 18/34] media: add V4L2_SUBDEV_CAP_STREAMS Tomi Valkeinen
2022-08-31 14:13 ` Tomi Valkeinen [this message]
2022-09-27 5:59 ` [PATCH v14 19/34] media: Documentation: Add GS_ROUTING documentation Sakari Ailus
2022-09-27 9:32 ` Tomi Valkeinen
2022-09-27 10:23 ` Sakari Ailus
2022-09-27 12:33 ` Tomi Valkeinen
2022-09-27 21:13 ` Sakari Ailus
2022-09-28 7:54 ` Tomi Valkeinen
2022-09-30 11:21 ` Sakari Ailus
2022-09-30 12:10 ` Tomi Valkeinen
2022-09-30 12:33 ` Sakari Ailus
2022-08-31 14:13 ` [PATCH v14 20/34] media: subdev: Add [GS]_ROUTING subdev ioctls and operations Tomi Valkeinen
2022-09-30 11:05 ` Sakari Ailus
2022-09-30 11:22 ` Tomi Valkeinen
2022-09-30 12:34 ` Sakari Ailus
2022-08-31 14:13 ` [PATCH v14 21/34] media: subdev: add v4l2_subdev_has_pad_interdep() Tomi Valkeinen
2022-09-23 9:50 ` Sakari Ailus
2022-08-31 14:13 ` [PATCH v14 22/34] media: subdev: add v4l2_subdev_set_routing helper() Tomi Valkeinen
2022-09-25 11:26 ` Sakari Ailus
2022-09-26 5:56 ` Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 23/34] media: subdev: Add for_each_active_route() macro Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 24/34] media: Documentation: add multiplexed streams documentation Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 25/34] media: subdev: add stream based configuration Tomi Valkeinen
2022-08-31 18:04 ` Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 26/34] media: subdev: use streams in v4l2_subdev_link_validate() Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 27/34] media: subdev: add "opposite" stream helper funcs Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 28/34] media: subdev: add streams to v4l2_subdev_get_fmt() helper function Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 29/34] media: subdev: add v4l2_subdev_set_routing_with_fmt() helper Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 30/34] media: subdev: add v4l2_subdev_routing_validate() helper Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 31/34] media: v4l2-subdev: Add v4l2_subdev_state_xlate_streams() helper Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 32/34] media: v4l2-subdev: Add subdev .(enable|disable)_streams() operations Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 33/34] media: v4l2-subdev: Add v4l2_subdev_s_stream_helper() function Tomi Valkeinen
2022-08-31 14:13 ` [PATCH v14 34/34] media: Add stream to frame descriptor Tomi Valkeinen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220831141357.1396081-20-tomi.valkeinen@ideasonboard.com \
--to=tomi.valkeinen@ideasonboard.com \
--cc=hverkuil-cisco@xs4all.nl \
--cc=jacopo+renesas@jmondi.org \
--cc=kishon@ti.com \
--cc=laurent.pinchart@ideasonboard.com \
--cc=linux-media@vger.kernel.org \
--cc=mchehab@kernel.org \
--cc=niklas.soderlund+renesas@ragnatech.se \
--cc=sakari.ailus@linux.intel.com \
--cc=satish.nagireddy@getcruise.com \
--cc=tfiga@chromium.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).