From patchwork Mon Jul 12 06:02:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 474111 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A9522C07E99 for ; Mon, 12 Jul 2021 06:58:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 92BCF613EE for ; Mon, 12 Jul 2021 06:58:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241371AbhGLHAm (ORCPT ); Mon, 12 Jul 2021 03:00:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:34094 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241647AbhGLG7U (ORCPT ); Mon, 12 Jul 2021 02:59:20 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9CDFF6124B; Mon, 12 Jul 2021 06:56:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626072992; bh=18+Jc0PhP/E+IytzuLC/A+R7EcaqVMwDvZg9ifROpSY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OBeaZqomko2wI1ueJ3XQ5nXuUZok4HGnk9gW7+BVjQunMZ2XQ3lendYllDIC3Mav/ NZzCpLR37KPLyhgWmxhforqzK6vB7WyB028RrnamPdApBzAbUhAq2hBaiSHbzMJRGv BwBeiX7VFkFdjlSfEAYJK1SKNgLveCpfNAO2Wp4g= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Linus Walleij , Stephan Gerhold , Stable@vger.kernel.org, Jonathan Cameron Subject: [PATCH 5.12 091/700] iio: accel: bmc150: Fix bma222 scale unit Date: Mon, 12 Jul 2021 08:02:54 +0200 Message-Id: <20210712060937.602105694@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060924.797321836@linuxfoundation.org> References: <20210712060924.797321836@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Stephan Gerhold commit 6e2a90af0b8d757e850cc023d761ee9a9492e2fe upstream. According to sysfs-bus-iio documentation the unit for accelerometer values after applying scale/offset should be m/s^2, not g, which explains why the scale values for the other variants in bmc150-accel do not match exactly the values given in the datasheet. To get the correct values, we need to multiply the BMA222 scale values by g = 9.80665 m/s^2. Fixes: a1a210bf29a1 ("iio: accel: bmc150-accel: Add support for BMA222") Reviewed-by: Linus Walleij Signed-off-by: Stephan Gerhold Link: https://lore.kernel.org/r/20210611080903.14384-2-stephan@gerhold.net Cc: Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/accel/bmc150-accel-core.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) --- a/drivers/iio/accel/bmc150-accel-core.c +++ b/drivers/iio/accel/bmc150-accel-core.c @@ -1171,11 +1171,12 @@ static const struct bmc150_accel_chip_in /* * The datasheet page 17 says: * 15.6, 31.3, 62.5 and 125 mg per LSB. + * IIO unit is m/s^2 so multiply by g = 9.80665 m/s^2. */ - .scale_table = { {156000, BMC150_ACCEL_DEF_RANGE_2G}, - {313000, BMC150_ACCEL_DEF_RANGE_4G}, - {625000, BMC150_ACCEL_DEF_RANGE_8G}, - {1250000, BMC150_ACCEL_DEF_RANGE_16G} }, + .scale_table = { {152984, BMC150_ACCEL_DEF_RANGE_2G}, + {306948, BMC150_ACCEL_DEF_RANGE_4G}, + {612916, BMC150_ACCEL_DEF_RANGE_8G}, + {1225831, BMC150_ACCEL_DEF_RANGE_16G} }, }, [bma222e] = { .name = "BMA222E",