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[188.217.51.176]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5ca0b07f601sm935598a12.22.2024.10.18.10.11.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Oct 2024 10:11:08 -0700 (PDT) From: Tommaso Merciai To: Cc: sakari.ailus@linux.intel.com, laurent.pinchart@ideasonboard.com, prabhakar.csengg@gmail.com, Tommaso Merciai , Mauro Carvalho Chehab , Laurent Pinchart , Hans Verkuil , Tomi Valkeinen , =?UTF-8?q?Pawe=C5=82=20Anikiel?= , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] media: v4l2-subdev: Refactor events Date: Fri, 18 Oct 2024 19:11:03 +0200 Message-Id: <20241018171104.1624426-1-tomm.merciai@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- 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-cor= e/v4l2-subdev.c index 3a4ba08810d2..77ca829b9983 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, unsign= ed int cmd, void *arg, return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK); =20 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; =20 case VIDIOC_UNSUBSCRIBE_EVENT: - return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg); + if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS)) + return -ENOIOCTLCMD; + + if (v4l2_subdev_has_op(sd, core, unsubscribe_event)) + return v4l2_subdev_call(sd, core, unsubscribe_event, + vfh, arg); + + return v4l2_event_subdev_unsubscribe(sd, vfh, arg); =20 #ifdef CONFIG_VIDEO_ADV_DEBUG case VIDIOC_DBG_G_REGISTER: @@ -1641,6 +1656,9 @@ int __v4l2_subdev_init_finalize(struct v4l2_subdev *s= d, const char *name, } } =20 + if (sd->ctrl_handler) + sd->flags |=3D V4L2_SUBDEV_FL_HAS_EVENTS; + state =3D __v4l2_subdev_state_alloc(sd, name, key); if (IS_ERR(state)) return PTR_ERR(state); --=20 2.34.1