From patchwork Thu Jun 10 12:21:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephan Gerhold X-Patchwork-Id: 457997 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=-18.8 required=3.0 tests=BAYES_00,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=unavailable 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 19E45C48BDF for ; Thu, 10 Jun 2021 12:24:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EAC0D6128A for ; Thu, 10 Jun 2021 12:24:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230350AbhFJM0L (ORCPT ); Thu, 10 Jun 2021 08:26:11 -0400 Received: from mo4-p02-ob.smtp.rzone.de ([85.215.255.84]:21848 "EHLO mo4-p02-ob.smtp.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230130AbhFJM0L (ORCPT ); Thu, 10 Jun 2021 08:26:11 -0400 ARC-Seal: i=1; a=rsa-sha256; t=1623327846; cv=none; d=strato.com; s=strato-dkim-0002; b=oUX/M8odnIAnnw2D1doRgDiaPGppWg1mZI3ctPQNFB5WCBw4v9vcuVeSY+2Bxzqn6b vwsn1eFUxYIW5vC2u1Uj+OxDgXjAptNVLTb1n/os1oAGodE1VGQgAn7bwFBMaqcxzwy0 HIdjZqx4MF7XYzw7y23R/N7LOJ54fZNUbpfk3rPfIwTfz5z1pj5fLeU5+nIf1c286xS4 0h3HuAIN2asbmHUPmU167sn+NkX55ejAXKIdnMAj0K6JimOB7nK3KM6UZRVlRLVJsJoY Gg3k4yPiAezx5qOYOF7N+HWOrUWlDOVEqk+Qq04qKqX6Fo82Dfhu2cXGuP3tnIpbRXhf kMdw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; t=1623327846; s=strato-dkim-0002; d=strato.com; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Cc:Date: From:Subject:Sender; bh=N255HoRwbQK6GgNYri2591dhE/OLkqcb75P2f4BWQ3w=; b=a9mK3ozC3pTxjjN0XXbgYOVqs7e12IrChZ6lgGKWdckIfkBl1I7oxJhvds0jVaxzHA XMBePJUrIo55fi6/5iAOkp/6WY0fE3cTMeJLZMaK0+/JGaWxf2Ha2A0c71Ltjv4h6k8S 6jhW5gB5cfAuKKoHHwQusboQb1ZxaUaAx7gaQu0RHTYckRKdCexp26+DoT3itCisFAfc w/x6UuhoTQzd9pwZrYL0+DdanCOM4mawJL+cxAqRXjD4zJRBUvNDIYXpyXlqD0xFpIbI +FFKTobRt4X9f9RVRWSk7DOrLaTA+p8egGiz2t0kuQ1LQbRtYqFVvAzlL0swNQ4BO8Tm 9DnQ== ARC-Authentication-Results: i=1; strato.com; dkim=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1623327846; s=strato-dkim-0002; d=gerhold.net; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Cc:Date: From:Subject:Sender; bh=N255HoRwbQK6GgNYri2591dhE/OLkqcb75P2f4BWQ3w=; b=mrx7uzURySm5jO1HQd7GxJ33XQm5GVNCHtcp2/9S9wz+26gs0b99HqzehRDxtZhds7 KV3+sGI/89lRtnjaNOSp5vA/bUPgBhwtFcyMIcFe5YM2cSWrS5of8SczOfH2+onlixUn k7PFvPS3pfA1qTmrZP/CIyhrFSEDvQRPqeQPHER4zsowZSfbFR4VKSgLo/T8oO4sUsez 5i1HLyLw/XdLCR2R1OSJ10cvkjvyBFw/FKt8I9UNaODM8EhS5V9UZBjaWq1C4oTNeZX/ NGfGEhRvAwe0lLZwXoTa9cr0j+inz04vacoaVpNBKGXXABvLbbRxTogk+RABhCn7tt10 aw4g== Authentication-Results: strato.com; dkim=none X-RZG-AUTH: ":P3gBZUipdd93FF5ZZvYFPugejmSTVR2nRPhVORvLd4SsytBXS7IYBkLahKxA626NTAM6" X-RZG-CLASS-ID: mo00 Received: from droid.. by smtp.strato.de (RZmta 47.27.2 DYNA|AUTH) with ESMTPSA id y01375x5ACO5tzs (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Thu, 10 Jun 2021 14:24:05 +0200 (CEST) From: Stephan Gerhold To: Jonathan Cameron Cc: Lars-Peter Clausen , Rob Herring , Linus Walleij , Peter Meerwald , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, Bastien Nocera , Hans de Goede , Andy Shevchenko , ~postmarketos/upstreaming@lists.sr.ht, Stephan Gerhold Subject: [PATCH v2 1/9] iio: accel: bmc150: Fix bma222 scale unit Date: Thu, 10 Jun 2021 14:21:18 +0200 Message-Id: <20210610122126.50504-2-stephan@gerhold.net> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210610122126.50504-1-stephan@gerhold.net> References: <20210610122126.50504-1-stephan@gerhold.net> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org 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 --- Added this patch in v2 to avoid conflicts later in case this should be backported to a stable kernel. --- drivers/iio/accel/bmc150-accel-core.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/iio/accel/bmc150-accel-core.c b/drivers/iio/accel/bmc150-accel-core.c index a3d08d713362..a80ee0fdabc5 100644 --- a/drivers/iio/accel/bmc150-accel-core.c +++ b/drivers/iio/accel/bmc150-accel-core.c @@ -1145,11 +1145,12 @@ static const struct bmc150_accel_chip_info bmc150_accel_chip_info_tbl[] = { /* * 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",