From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.kundenserver.de ([212.227.17.10]:51351 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752164AbdA1X64 (ORCPT ); Sat, 28 Jan 2017 18:58:56 -0500 Date: Sun, 29 Jan 2017 00:57:48 +0100 From: Andreas Klinger To: jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, gregkh@linuxfoundation.org, dledford@redhat.com, akpm@linux-foundation.org, shraddha.6596@gmail.com, w@1wt.eu, balbi@kernel.org, mtk.manpages@gmail.com, sjenning@redhat.com, ksenija.stanojevic@gmail.com, vilhelm.gray@gmail.com, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org Cc: ak@it-klinger.de Subject: [PATCH 0/2] iio: distance: devantech srf04 us ranger Message-ID: <20170128235748.GA4775@andreas> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-iio-owner@vger.kernel.org List-Id: linux-iio@vger.kernel.org This patch series adds support for the devantech srf04 ultrasonic ranger as IIO device. The device is able to recognize objects in a range of 1 cm and 3 meters. The theoretical resolution is about 3 mm, practically more or less 1 cm. Use cases for this device are level metering in tanks or distance measuring in robotics. This driver works by triggering the device and waiting for the echo, for which a GPIO is set when send out and reset when the echo is received. The echo must be an interrupt and the time between rising and falling is measured. The returned distance is calculated with a ultrasonic speed of 343 m/s which is the correct value at 20 degrees celsius. For different temperatures one might want to compensate the temperature. Look at the source code for details. Documenation can be found at: http://www.robot-electronics.co.uk/htm/srf04tech.htm Andreas Klinger (2): iio: distance: add dt binding for devantech-srf04 iio: distance: add devantech us ranger srf04 .../bindings/iio/proximity/devantech-srf04.txt | 17 ++ MAINTAINERS | 6 + drivers/iio/proximity/Kconfig | 11 + drivers/iio/proximity/Makefile | 1 + drivers/iio/proximity/srf04.c | 269 +++++++++++++++++++++ 5 files changed, 304 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/proximity/devantech-srf04.txt create mode 100644 drivers/iio/proximity/srf04.c -- 2.1.4