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Message-Id: <20241020163534.1720297-1-tomm.merciai@gmail.com>
Date: Sun, 20 Oct 2024 18:35:32 +0200
From: Tommaso Merciai <tomm.merciai@...il.com>
To:
Cc: sakari.ailus@...ux.intel.com,
laurent.pinchart@...asonboard.com,
Tommaso Merciai <tomm.merciai@...il.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
Hans Verkuil <hverkuil@...all.nl>,
Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
Paweł Anikiel <panikiel@...gle.com>,
linux-media@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2] media: v4l2-subdev: Refactor events
Controls can be exposed to userspace via a v4l-subdevX device, and
userspace has to be able to subscribe to control events so that it is
notified when the control changes value.
If a control handler is set for the subdev then set the HAS_EVENTS
flag automatically into v4l2_subdev_init_finalize() and use
v4l2_ctrl_subdev_subscribe_event() and v4l2_event_subdev_unsubscribe()
as default if subdev don't have .(un)subscribe control operations.
Signed-off-by: Tommaso Merciai <tomm.merciai@...il.com>
---
Changes since v1:
- Aligned event subscription with unsubscription as suggested by LPinchart,
SAilus
drivers/media/v4l2-core/v4l2-subdev.c | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 3a4ba08810d2..fad8fa1f63e8 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -691,10 +691,25 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg,
return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
case VIDIOC_SUBSCRIBE_EVENT:
- return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
+ if (v4l2_subdev_has_op(sd, core, subscribe_event))
+ return v4l2_subdev_call(sd, core, subscribe_event,
+ vfh, arg);
+
+ if ((sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS) &&
+ vfh->ctrl_handler)
+ return v4l2_ctrl_subdev_subscribe_event(sd, vfh, arg);
+
+ return -ENOIOCTLCMD;
case VIDIOC_UNSUBSCRIBE_EVENT:
- return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
+ if (v4l2_subdev_has_op(sd, core, unsubscribe_event))
+ return v4l2_subdev_call(sd, core, unsubscribe_event,
+ vfh, arg);
+
+ if (sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS)
+ return v4l2_event_subdev_unsubscribe(sd, vfh, arg);
+
+ return -ENOIOCTLCMD;
#ifdef CONFIG_VIDEO_ADV_DEBUG
case VIDIOC_DBG_G_REGISTER:
@@ -1641,6 +1656,9 @@ int __v4l2_subdev_init_finalize(struct v4l2_subdev *sd, const char *name,
}
}
+ if (sd->ctrl_handler)
+ sd->flags |= V4L2_SUBDEV_FL_HAS_EVENTS;
+
state = __v4l2_subdev_state_alloc(sd, name, key);
if (IS_ERR(state))
return PTR_ERR(state);
--
2.34.1
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