linux-kernel - Re: [PATCH v2] media: v4l2-subdev: Refactor events

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Message-ID: <ZxYNzxH0UGy/jsEG@tom-HP-ZBook-Fury-15-G7-Mobile-Workstation>
Date: Mon, 21 Oct 2024 10:16:15 +0200
From: Tommaso Merciai <tomm.merciai@...il.com>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	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: Re: [PATCH v2] media: v4l2-subdev: Refactor events

Hi Sakari,

On Mon, Oct 21, 2024 at 07:26:41AM +0000, Sakari Ailus wrote:
> Hi Laurent, Tommaso,
> 
> On Sun, Oct 20, 2024 at 07:43:54PM +0300, Laurent Pinchart wrote:
> > 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@...asonboard.com>
> > 
> > > Signed-off-by: Tommaso Merciai <tomm.merciai@...il.com>
> > 
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> 
> Thanks!
> 
> I've picked this to my tree.
> 
> Please try to properly wrap the commit message the next time, most editors
> can do that automatically.

Mmm..
In theory I have this cfg for my vim:

filetype plugin indent on
syntax on
set title
set tabstop=8
set softtabstop=8
set shiftwidth=8
set noexpandtab
set number
set hidden

Thanks & Regards,
Tommaso

> 
> -- 
> Sakari Ailus