From nobody Mon Sep 29 21:24:48 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 88989C2BB9D for ; Tue, 16 Aug 2022 00:14:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1357130AbiHPANF (ORCPT ); Mon, 15 Aug 2022 20:13:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47912 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356926AbiHPADV (ORCPT ); Mon, 15 Aug 2022 20:03:21 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 582AA16CCD4; Mon, 15 Aug 2022 13:25:05 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id BCF4BB8119B; Mon, 15 Aug 2022 20:25:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 084C1C433C1; Mon, 15 Aug 2022 20:25:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660595102; bh=dz7vQ4RXKIwyT5wUIh04z6+gRNzyrIgUgYrhIoQKgSM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PEX0qeSRp9MuRVJGIGBgsBH+6Ib1NlZ53tTP9NAbAhQ63lLNLCPcx95khKI7csLxz uUnqIzhj28MK8MGP3MZegBdqa6JASAQXhAs9KRDwGsbUAqkgjuM/tHbTronW/8qGLX rEo1Us/Oas9zL9Ly1qXaAo22RYe7rjZ1y/DRRP+Q= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jagath Jog J , Andy Shevchenko , Jonathan Cameron , Sasha Levin Subject: [PATCH 5.19 0625/1157] iio: accel: bma400: Fix the scale min and max macro values Date: Mon, 15 Aug 2022 19:59:41 +0200 Message-Id: <20220815180504.665455106@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180439.416659447@linuxfoundation.org> References: <20220815180439.416659447@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Jagath Jog J [ Upstream commit 747c7cf1592e226d40543231b26502b332d0ea2f ] Changing the scale macro values to match the bma400 sensitivity for 1 LSB of all the available ranges. Fixes: 465c811f1f20 ("iio: accel: Add driver for the BMA400") Signed-off-by: Jagath Jog J Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220505133021.22362-2-jagathjog1996@gmail.= com Signed-off-by: Jonathan Cameron Signed-off-by: Sasha Levin --- drivers/iio/accel/bma400.h | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/drivers/iio/accel/bma400.h b/drivers/iio/accel/bma400.h index c4c8d74155c2..80330c7ce17f 100644 --- a/drivers/iio/accel/bma400.h +++ b/drivers/iio/accel/bma400.h @@ -83,8 +83,27 @@ #define BMA400_ACC_ODR_MIN_WHOLE_HZ 25 #define BMA400_ACC_ODR_MIN_HZ 12 =20 -#define BMA400_SCALE_MIN 38357 -#define BMA400_SCALE_MAX 306864 +/* + * BMA400_SCALE_MIN macro value represents m/s^2 for 1 LSB before + * converting to micro values for +-2g range. + * + * For +-2g - 1 LSB =3D 0.976562 milli g =3D 0.009576 m/s^2 + * For +-4g - 1 LSB =3D 1.953125 milli g =3D 0.019153 m/s^2 + * For +-16g - 1 LSB =3D 7.8125 milli g =3D 0.076614 m/s^2 + * + * The raw value which is used to select the different ranges is determined + * by the first bit set position from the scale value, so BMA400_SCALE_MIN + * should be odd. + * + * Scale values for +-2g, +-4g, +-8g and +-16g are populated into bma400_s= cales + * array by left shifting BMA400_SCALE_MIN. + * e.g.: + * To select +-2g =3D 9577 << 0 =3D raw value to write is 0. + * To select +-8g =3D 9577 << 2 =3D raw value to write is 2. + * To select +-16g =3D 9577 << 3 =3D raw value to write is 3. + */ +#define BMA400_SCALE_MIN 9577 +#define BMA400_SCALE_MAX 76617 =20 #define BMA400_NUM_REGULATORS 2 #define BMA400_VDD_REGULATOR 0 --=20 2.35.1