Hi Tommaso, Thank you for the patch. On Sun, Oct 20, 2024 at 06:35:32PM +0200, Tommaso Merciai wrote: > 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. I would add here This simplifies subdev drivers by avoiding the need to set the V4L2_SUBDEV_FL_HAS_EVENTS flag and plug the event handlers, and ensures consistency of the API exposed to userspace. And you can also add Suggested-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> > Signed-off-by: Tommaso Merciai <tomm.merciai@xxxxxxxxx> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> Now, can we simplify sensor drivers to drop the event handlers and the flag ? :-) > --- > 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); -- Regards, Laurent Pinchart
