From mboxrd@z Thu Jan 1 00:00:00 1970 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 1F14BC00140 for ; Mon, 15 Aug 2022 19:13:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343935AbiHOTNq (ORCPT ); Mon, 15 Aug 2022 15:13:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44150 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343701AbiHOTKR (ORCPT ); Mon, 15 Aug 2022 15:10:17 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 553452D1DA; Mon, 15 Aug 2022 11:36:33 -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 029BCB80F99; Mon, 15 Aug 2022 18:36:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 40D37C433D6; Mon, 15 Aug 2022 18:36:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660588590; bh=ERRidEaSPf8YlJJ5Z2ddvXrwawPyaJ/IhkO6FODEPfM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EWpMSKWO0VDEg2GVH1RPXnGUjA3RYF777zt1QwjLra4H0vKBeKyPje5Khu7hXPndD cuN4kw0ZVvSxV79Hd5NdwtVtFPhSynRktpGlg5HsEWZM6klDHW64YG/OP7niWHpCTy OF8WGv3+EcogplEPs1pzf1qBO7/8zNCTO9XOGSb8= 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 5.15 425/779] iio: accel: bma400: Fix the scale min and max macro values Date: Mon, 15 Aug 2022 20:01:09 +0200 Message-Id: <20220815180355.429923382@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180337.130757997@linuxfoundation.org> References: <20220815180337.130757997@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 5ad10db9819f..416090c6b1e8 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 -#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 = 0.976562 milli g = 0.009576 m/s^2 + * For +-4g - 1 LSB = 1.953125 milli g = 0.019153 m/s^2 + * For +-16g - 1 LSB = 7.8125 milli g = 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_scales + * array by left shifting BMA400_SCALE_MIN. + * e.g.: + * To select +-2g = 9577 << 0 = raw value to write is 0. + * To select +-8g = 9577 << 2 = raw value to write is 2. + * To select +-16g = 9577 << 3 = raw value to write is 3. + */ +#define BMA400_SCALE_MIN 9577 +#define BMA400_SCALE_MAX 76617 #define BMA400_NUM_REGULATORS 2 #define BMA400_VDD_REGULATOR 0 -- 2.35.1