Hi Laurent, Sakari,
Thanks for your comments.
On Thu, Sep 12, 2024 at 03:18:16PM +0300, Laurent Pinchart wrote:
> On Thu, Sep 12, 2024 at 12:14:52PM +0000, Sakari Ailus wrote:
> > On Thu, Sep 12, 2024 at 03:05:10PM +0300, Laurent Pinchart wrote:
> > > On Thu, Sep 12, 2024 at 01:11:13PM +0200, Tommaso Merciai wrote:
> > > > On Thu, Sep 12, 2024 at 01:44:09PM +0300, Laurent Pinchart wrote:
> > > > > On Tue, Sep 10, 2024 at 03:44:27PM +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. Add missing HAS_EVENTS flag.
> > > > >
> > > > > How is this supposed to work, given that the driver doesn't implement
> > > > > .subscribe_event() ?
> > > >
> > > > You are completely right, sorry.
> > > > I think in both cases I'm missing:
> > > >
> > > > diff --git a/drivers/media/i2c/max96714.c b/drivers/media/i2c/max96714.c
> > > > index 94b1bc000e48..2257b6b807ea 100644
> > > > --- a/drivers/media/i2c/max96714.c
> > > > +++ b/drivers/media/i2c/max96714.c
> > > > @@ -17,6 +17,7 @@
> > > >
> > > > #include <media/v4l2-cci.h>
> > > > #include <media/v4l2-ctrls.h>
> > > > +#include <media/v4l2-event.h>
> > > > #include <media/v4l2-fwnode.h>
> > > > #include <media/v4l2-subdev.h>
> > > >
> > > > @@ -488,6 +489,8 @@ static int max96714_log_status(struct v4l2_subdev *sd)
> > > >
> > > > static const struct v4l2_subdev_core_ops max96714_subdev_core_ops = {
> > > > .log_status = max96714_log_status,
> > > > + .subscribe_event = v4l2_ctrl_subdev_subscribe_event,
> > > > + .unsubscribe_event = v4l2_event_subdev_unsubscribe,
> > > > };
> > > >
> > > > static const struct v4l2_subdev_video_ops max96714_video_ops = {
> > > >
> > > > Like you suggest. Or I'm wrong?
> > >
> > > That looks better :-)
> > >
> > > Out of curiosity, what's your use case for control events ?
> >
> > I'm not sure if there's a use case, however control event should be
> > supported when a driver supports controls.
>
> Not disputing that. That's why I asked "out of curiosity".
No use case :'(.
Sakari point me that we are missing events flag, some days ago.
Thanks & Regards,
Tommaso
>
> --
> Regards,
>
> Laurent Pinchart
