From patchwork Mon Apr 27 14:00:19 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andreas Klinger X-Patchwork-Id: 11512195 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0209E14DD for ; Mon, 27 Apr 2020 14:01:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E6EAD2064C for ; Mon, 27 Apr 2020 14:00:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727010AbgD0OA7 (ORCPT ); Mon, 27 Apr 2020 10:00:59 -0400 Received: from mout.kundenserver.de ([212.227.126.133]:37709 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727824AbgD0OAw (ORCPT ); Mon, 27 Apr 2020 10:00:52 -0400 Received: from localhost ([109.41.194.26]) by mrelayeu.kundenserver.de (mreue012 [212.227.15.167]) with ESMTPSA (Nemesis) id 1N6sON-1j7g1g0Aed-018Lsx; Mon, 27 Apr 2020 16:00:23 +0200 Date: Mon, 27 Apr 2020 16:00:19 +0200 From: Andreas Klinger To: jic23@kernel.org Cc: knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, bgolaszewski@baylibre.com, linus.walleij@linaro.org, tglx@linutronix.de, allison@lohutok.net, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] iio: bmp280: fix compensation of humidity Message-ID: <20200427140017.GA25402@arbad> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) X-Provags-ID: V03:K1:tcKH7nPEyKfMcDD2F9kaxMB5SlaQQyO81sdZWyfprhBwlc8BRZ5 CKn9SjH/HoNL2EiXPUG0olFXqFqTpIwnBQHI/cXeAGrTHFuSowrGcAatD7uiz1p9jVVuCQV BztvGLp6CEf5KXe6caXnuertc2S4mNiY8Rri/OhNLfzVIUrPpfEqX5AysUIfY8k3sSYe3AY k75pwe3lujqHkt3NSdGhg== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:MhHVfASsqnE=:oA/7DL60ewl/0B+eL9FqNa 21qi8f6W/DmlH1ebuMABZsQtGM/+PCyRbJO4VT8boGgPrAiOm7tigdBJLxBxyqcagNA/ocHdz HuE1aDm7gsaIC6HaBlY+jYtkxdLpf7kFU6x4S2MKK14IiKEbNMbvIv3W2Z1aa6w+/BJhiSibC AB5PGrlwHehYSCXjV40QtRo6QF/4iaLBWhauCqmkZ2/fLp2IccWNmA/nc3Bld0GGL+pRcS6dn bh+1FRo1ejHhpu7Z6GnMJGTIfaXIKPziL4Ih2gcaVswzbeBdhx0BBGFSGNJxgGD9+prZ4w8h7 w1q4otzUD3kFi+DCwo+hxUd5RWLoWWqRFE42KS99yVHIcmemq1Rlvj00t0hCgRjMYQTmfFudL TDb7S2lhJSa3alkf7T6v4sH85E3K6g2AaoScS4rb4kxxHrv0QC76LM0V1XBg/9devS5kA1/8K /8fpjOe6ucadozFs4D1Rb7KUjh7+1UX6HbuKyPp9x2oxcb2Tm+Ut1Rin49Xoz4SwfgtXmw/s9 vHvhvHO4pu5oLgupYXCvvC0+R+/HMONg+Jl35NUP/JZ0p9Fdy+0ABkUT9HuJtE51fzTj9dgc3 HHR5QBAFRt1mqLCNbMpnGvupvCctccZZj/Fe23FcE0kyiUDVW1lrP0CJTIuCUnS3H55NB+crK SGUAc/T7B0+WAvqY8+TYXbzLoCwtDmaZTAGIN56huUkiPinndGdaQ+lhyAyym+VufAZujszyS X5GBAchc+kWxtaU32KQCszQ+QoBGS58LE1xlf6cVMSdZWIf4/8hdJSbPcVpHqGPeD88euZHwk hsgpcBnRKgH2aPcLcU/Vb1yC2YEm+rOaBZkoMvVc6u89yzMbhY/ZbgpyhA6J2U87LY3dKHx Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Output of humidity compensation is limited to the range between 0 and 100 percent. Add this to the compensation formula as described in the datasheet chapter 4.2.3. Signed-off-by: Andreas Klinger --- drivers/iio/pressure/bmp280-core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c index 29c209cc1108..ac9ef1b63b07 100644 --- a/drivers/iio/pressure/bmp280-core.c +++ b/drivers/iio/pressure/bmp280-core.c @@ -271,6 +271,9 @@ static u32 bmp280_compensate_humidity(struct bmp280_data *data, + (s32)2097152) * calib->H2 + 8192) >> 14); var -= ((((var >> 15) * (var >> 15)) >> 7) * (s32)calib->H1) >> 4; + var = var < 0 ? 0 : var; + var = var > 419430400 ? 419430400 : var; + return var >> 12; };