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media: subdev: Add [GS]_ROUTING subdev ioctls and operations

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Add support for subdev internal routing. A route is defined as a single
stream from a sink pad to a source pad.

The userspace can configure the routing via two new ioctls,
VIDIOC_SUBDEV_G_ROUTING and VIDIOC_SUBDEV_S_ROUTING, and subdevs can
implement the functionality with v4l2_subdev_pad_ops.set_routing().

- Add sink and source streams for multiplexed links
- Copy the argument back in case of an error. This is needed to let the
  caller know the number of routes.
- Expand and refine documentation.
- Make the 'routes' pointer a __u64 __user pointer so that a compat32
  version of the ioctl is not required.
- Add struct v4l2_subdev_krouting to be used for subdevice operations.
- Fix typecasing warnings
- Check sink & source pad types
- Add 'which' field
- Routing to subdev state
- Dropped get_routing subdev op

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Laurent Pinchart 2021-04-23 09:15:54 +02:00 • committed by Mauro Carvalho Chehab
parent ea73eda508
commit a418bb3f30
4 changed files with 173 additions and 1 deletions
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43
include/uapi/linux/v4l2-subdev.h
View file

@ -11,6 +11,7 @@
#ifndef __LINUX_V4L2_SUBDEV_H
#define __LINUX_V4L2_SUBDEV_H
#include <linux/const.h>
#include <linux/ioctl.h>
#include <linux/types.h>
#include <linux/v4l2-common.h>
@ -178,6 +179,46 @@ struct v4l2_subdev_capability {
/* The v4l2 sub-device supports routing and multiplexed streams. */
#define V4L2_SUBDEV_CAP_STREAMS 0x00000002
/*
* Is the route active? An active route will start when streaming is enabled
* on a video node.
*/
#define V4L2_SUBDEV_ROUTE_FL_ACTIVE (1U << 0)
/**
* struct v4l2_subdev_route - A route inside a subdev
*
* @sink_pad: the sink pad index
* @sink_stream: the sink stream identifier
* @source_pad: the source pad index
* @source_stream: the source stream identifier
* @flags: route flags V4L2_SUBDEV_ROUTE_FL_*
* @reserved: drivers and applications must zero this array
*/
struct v4l2_subdev_route {
__u32 sink_pad;
__u32 sink_stream;
__u32 source_pad;
__u32 source_stream;
__u32 flags;
__u32 reserved[5];
};
/**
* struct v4l2_subdev_routing - Subdev routing information
*
* @which: configuration type (from enum v4l2_subdev_format_whence)
* @num_routes: the total number of routes in the routes array
* @routes: pointer to the routes array
* @reserved: drivers and applications must zero this array
*/
struct v4l2_subdev_routing {
__u32 which;
__u32 num_routes;
__u64 routes;
__u32 reserved[6];
};
/* Backwards compatibility define --- to be removed */
#define v4l2_subdev_edid v4l2_edid
@ -193,6 +234,8 @@ struct v4l2_subdev_capability {
#define VIDIOC_SUBDEV_S_CROP _IOWR('V', 60, struct v4l2_subdev_crop)
#define VIDIOC_SUBDEV_G_SELECTION _IOWR('V', 61, struct v4l2_subdev_selection)
#define VIDIOC_SUBDEV_S_SELECTION _IOWR('V', 62, struct v4l2_subdev_selection)
#define VIDIOC_SUBDEV_G_ROUTING _IOWR('V', 38, struct v4l2_subdev_routing)
#define VIDIOC_SUBDEV_S_ROUTING _IOWR('V', 39, struct v4l2_subdev_routing)
/* The following ioctls are identical to the ioctls in videodev2.h */
#define VIDIOC_SUBDEV_G_STD _IOR('V', 23, v4l2_std_id)
#define VIDIOC_SUBDEV_S_STD _IOW('V', 24, v4l2_std_id)