From patchwork Thu Nov 12 16:46:56 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Luis Henriques X-Patchwork-Id: 543519 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from huckleberry.canonical.com (huckleberry.canonical.com [91.189.94.19]) by ozlabs.org (Postfix) with ESMTP id 404B814143C; Fri, 13 Nov 2015 03:49:39 +1100 (AEDT) Received: from localhost ([127.0.0.1] helo=huckleberry.canonical.com) by huckleberry.canonical.com with esmtp (Exim 4.76) (envelope-from ) id 1Zwv44-0000Vc-Hg; Thu, 12 Nov 2015 16:49:36 +0000 Received: from youngberry.canonical.com ([91.189.89.112]) by huckleberry.canonical.com with esmtp (Exim 4.76) (envelope-from ) id 1Zwv1Y-0007M6-Dq for kernel-team@lists.ubuntu.com; Thu, 12 Nov 2015 16:47:00 +0000 Received: from 1.general.henrix.uk.vpn ([10.172.192.212] helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.76) (envelope-from ) id 1Zwv1V-00089e-Vi; Thu, 12 Nov 2015 16:46:58 +0000 From: Luis Henriques To: Alexandre Belloni Subject: [3.16.y-ckt stable] Patch "iio: mxs-lradc: Fix temperature offset" has been added to staging queue Date: Thu, 12 Nov 2015 16:46:56 +0000 Message-Id: <1447346816-31245-1-git-send-email-luis.henriques@canonical.com> X-Mailer: git-send-email 2.1.4 X-Extended-Stable: 3.16 MIME-Version: 1.0 Cc: Stefan Wahren , Marek Vasut , =?UTF-8?q?Janusz=20U=C5=BCycki?= , kernel-team@lists.ubuntu.com, Jonathan Cameron X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.14 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: kernel-team-bounces@lists.ubuntu.com This is a note to let you know that I have just added a patch titled iio: mxs-lradc: Fix temperature offset to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree which can be found at: http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue This patch is scheduled to be released in version 3.16.7-ckt20. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.16.y-ckt tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Luis ------ From 79c2ede66c35da9ed3d2f4d1d05b3a50d5b638fc Mon Sep 17 00:00:00 2001 From: Alexandre Belloni Date: Wed, 7 Oct 2015 13:10:54 +0200 Subject: iio: mxs-lradc: Fix temperature offset MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit commit b94e22805a2224061bb263a82b72e09544a5fbb3 upstream. 0° Kelvin is actually −273.15°C, not -272.15°C. Fix the temperature offset. Also improve the comment explaining the calculation. Reported-by: Janusz Użycki Signed-off-by: Alexandre Belloni Acked-by: Stefan Wahren Acked-by: Marek Vasut Signed-off-by: Jonathan Cameron Signed-off-by: Luis Henriques --- drivers/staging/iio/adc/mxs-lradc.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c index 37a1192f1637..57563571c965 100644 --- a/drivers/staging/iio/adc/mxs-lradc.c +++ b/drivers/staging/iio/adc/mxs-lradc.c @@ -917,11 +917,12 @@ static int mxs_lradc_read_raw(struct iio_dev *iio_dev, case IIO_CHAN_INFO_OFFSET: if (chan->type == IIO_TEMP) { /* The calculated value from the ADC is in Kelvin, we - * want Celsius for hwmon so the offset is - * -272.15 * scale + * want Celsius for hwmon so the offset is -273.15 + * The offset is applied before scaling so it is + * actually -213.15 * 4 / 1.012 = -1079.644268 */ - *val = -1075; - *val2 = 691699; + *val = -1079; + *val2 = 644268; return IIO_VAL_INT_PLUS_MICRO; }