linux-kernel - [PATCH v16 03/20] media: add V4L2_SUBDEV_CAP

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Message-Id: <20221215121634.287100-4-tomi.valkeinen@ideasonboard.com>
Date:   Thu, 15 Dec 2022 14:16:17 +0200
From:   Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        sakari.ailus@...ux.intel.com,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        niklas.soderlund+renesas@...natech.se,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        satish.nagireddy@...cruise.com, Tomasz Figa <tfiga@...omium.org>
Cc:     Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: [PATCH v16 03/20] media: add V4L2_SUBDEV_CAP_STREAMS

Add a subdev capability flag to expose to userspace if a subdev supports
multiplexed streams.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 5 ++++-
 include/uapi/linux/v4l2-subdev.h      | 3 +++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index ca5b764d796d..8983d33fdb4b 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -431,6 +431,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg,
 	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
 	struct v4l2_fh *vfh = file->private_data;
 	bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags);
+	bool streams_subdev = sd->flags & V4L2_SUBDEV_FL_STREAMS;
 	int rval;
 
 	switch (cmd) {
@@ -439,7 +440,9 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg,
 
 		memset(cap->reserved, 0, sizeof(cap->reserved));
 		cap->version = LINUX_VERSION_CODE;
-		cap->capabilities = ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV : 0;
+		cap->capabilities =
+			(ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV : 0) |
+			(streams_subdev ? V4L2_SUBDEV_CAP_STREAMS : 0);
 
 		return 0;
 	}
diff --git a/include/uapi/linux/v4l2-subdev.h b/include/uapi/linux/v4l2-subdev.h
index 658106f5b5dc..89af27f50a41 100644
--- a/include/uapi/linux/v4l2-subdev.h
+++ b/include/uapi/linux/v4l2-subdev.h
@@ -188,6 +188,9 @@ struct v4l2_subdev_capability {
 /* The v4l2 sub-device video device node is registered in read-only mode. */
 #define V4L2_SUBDEV_CAP_RO_SUBDEV		0x00000001
 
+/* The v4l2 sub-device supports routing and multiplexed streams. */
+#define V4L2_SUBDEV_CAP_STREAMS			0x00000002
+
 /* Backwards compatibility define --- to be removed */
 #define v4l2_subdev_edid v4l2_edid
 
-- 
2.34.1