linux-kernel - Re: [PATCH 1/2] media: i2c: max96714: add HAS

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Message-ID: <ZuLMUaxn/oTw5dco@tom-HP-ZBook-Fury-15-G7-Mobile-Workstation>
Date: Thu, 12 Sep 2024 13:11:13 +0200
From: Tommaso Merciai <tomm.merciai@...il.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: linuxfancy@...glegroups.com, sakari.ailus@...ux.intel.com,
	julien.massot@...labora.com,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] media: i2c: max96714: add HAS_EVENTS subdev flag

Hi Laurent,

On Thu, Sep 12, 2024 at 01:44:09PM +0300, Laurent Pinchart wrote:
> Hi Tommaso,
> 
> 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?

Thanks & Regards,
Tommaso

> 
> > Signed-off-by: Tommaso Merciai <tomm.merciai@...il.com>
> > ---
> >  drivers/media/i2c/max96714.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/media/i2c/max96714.c b/drivers/media/i2c/max96714.c
> > index 159753b13777..94b1bc000e48 100644
> > --- a/drivers/media/i2c/max96714.c
> > +++ b/drivers/media/i2c/max96714.c
> > @@ -602,7 +602,8 @@ static int max96714_create_subdev(struct max96714_priv *priv)
> >  		goto err_free_ctrl;
> >  	}
> >  
> > -	priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_STREAMS;
> > +	priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
> > +			  V4L2_SUBDEV_FL_HAS_EVENTS | V4L2_SUBDEV_FL_STREAMS;
> >  	priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
> >  	priv->sd.entity.ops = &max96714_entity_ops;
> >  
> 
> -- 
> Regards,
> 
> Laurent Pinchart