linux-kernel - Re: [PATCH v5 9/9] Input: sur40 - use new V4L2 touch input type

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Date:	Thu, 23 Jun 2016 08:41:49 +0200
From:	Florian Echtler <floe@...terbrot.org>
To:	Nick Dyer <nick.dyer@...ev.co.uk>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Hans Verkuil <hverkuil@...all.nl>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Benson Leung <bleung@...omium.org>,
	Alan Bowens <Alan.Bowens@...el.com>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Chris Healy <cphealy@...il.com>,
	Henrik Rydberg <rydberg@...math.org>,
	Andrew Duggan <aduggan@...aptics.com>,
	James Chen <james.chen@....com.tw>,
	Dudley Du <dudl@...ress.com>,
	Andrew de los Reyes <adlr@...omium.org>,
	sheckylin@...omium.org, Peter Hutterer <peter.hutterer@...-t.net>,
	mchehab@....samsung.com, Martin Kaltenbrunner <modin@...i.at>
Subject: Re: [PATCH v5 9/9] Input: sur40 - use new V4L2 touch input type

On 23.06.2016 00:08, Nick Dyer wrote:
> diff --git a/drivers/input/touchscreen/sur40.c b/drivers/input/touchscreen/sur40.c
> index 880c40b..841e045 100644
> --- a/drivers/input/touchscreen/sur40.c
> +++ b/drivers/input/touchscreen/sur40.c
> @@ -599,7 +599,7 @@ static int sur40_probe(struct usb_interface *interface,
>  	sur40->vdev.queue = &sur40->queue;
>  	video_set_drvdata(&sur40->vdev, sur40);
>  
> -	error = video_register_device(&sur40->vdev, VFL_TYPE_GRABBER, -1);
> +	error = video_register_device(&sur40->vdev, VFL_TYPE_TOUCH, -1);
>  	if (error) {
>  		dev_err(&interface->dev,
>  			"Unable to register video subdevice.");

As far as I could tell from looking at patch 1/9, the only visible
change for userspace will be the device name, so I'd be fine with this.

> @@ -794,7 +794,7 @@ static int sur40_vidioc_enum_fmt(struct file *file, void *priv,
>  	if (f->index != 0)
>  		return -EINVAL;
>  	strlcpy(f->description, "8-bit greyscale", sizeof(f->description));
> -	f->pixelformat = V4L2_PIX_FMT_GREY;
> +	f->pixelformat = V4L2_TCH_FMT_TU08;

I would suggest to leave the pixel format as it is. Rationale: the data
really is greyscale image intensity data (as also evidenced by [1]), not
just a synthetic image, and changing the pixel format would break all
userspace tools.

[1] https://github.com/mkalten/reacTIVision/issues/3#issuecomment-99931807

Best, Florian
-- 
SENT FROM MY DEC VT50 TERMINAL



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