linux-kernel - Re: [RFC PATCH 0/3] Introduce IIO interface for fingerprint sensors

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Message-ID: <54C27AE4.4020702@butterbrot.org>
Date:	Fri, 23 Jan 2015 17:46:28 +0100
From:	Florian Echtler <floe@...terbrot.org>
To:	"Baluta, Teodora" <teodora.baluta@...el.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Jonathan Cameron <jic23@...nel.org>
CC:	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-iio <linux-iio@...r.kernel.org>,
	LMML <linux-media@...r.kernel.org>,
	Hans Verkuil <hverkuil@...all.nl>
Subject: Re: [RFC PATCH 0/3] Introduce IIO interface for fingerprint sensors

Hello Teodora,

On 23.01.2015 14:05, Baluta, Teodora wrote:
> The fingerprint sensor acts more like a scanner device, so the
> closest type is the V4L2_CAP_VIDEO_CAPTURE. However, this is not a
> perfect match because the driver only sends an image, once, when
> triggered. Would it be a better alternative to define a new
> capability type? Or it would be acceptable to simply have a video
> device with no frame buffer or frame rate and the user space
> application to read from the character device /dev/videoX?
Sorry if I jump in here right in the middle of this discussion, but some
time ago, I wrote a fingerprint sensor driver for the Siemens ID Mouse
(still part of the kernel AFAICT) which acts as a misc device and just
creates a character device node that can be used to directly read a PGM
file.

Maybe this would be a slightly simpler approach than pulling in all the
streaming-optimized features of V4L2?

Best, Florian
-- 
SENT FROM MY DEC VT50 TERMINAL


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