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 63854C433F5 for ; Sat, 26 Mar 2022 19:41:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234771AbiCZTne (ORCPT ); Sat, 26 Mar 2022 15:43:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46316 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232156AbiCZTna (ORCPT ); Sat, 26 Mar 2022 15:43:30 -0400 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8FB4B171EE9; Sat, 26 Mar 2022 12:41:53 -0700 (PDT) Received: by mail-pj1-x1033.google.com with SMTP id m22so10494130pja.0; Sat, 26 Mar 2022 12:41:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=2MUvttVDJrqfDquwKrENIil7MJ5lIrh0ddfHwkgcdCU=; b=OxUshMVF0J2GRicRE0VwXbMqn/Uv0RTovqyRQ7iZJ5ldXyDhXvk4kREeQZVXhL7iGT 9x8NT/sKke1qJo+Wdg27rWyZ3zpH+EvpFSLsgZrB9TcE9lHrfgRUiAvIkj6hSkUVqsjW dlOvQjrlwLcyZ48g3GPYOGtp7zi3zhPMyUL8KugrRxX89cFltDbaZIC3XP3AxQcdDys9 GU6pJmgZG6i+AnaUdCEM0ZBEhGcxyzdd+g2eHhagZr/aHQekjv3mjAgiG8wsYYMKWmCF bT2wqem6cQCtCJ73aDhKHkdzSsq9CEx+0o2WQX/rn0yfAn/uVSflFtyUaOMZccGoQ/lp YUBA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=2MUvttVDJrqfDquwKrENIil7MJ5lIrh0ddfHwkgcdCU=; b=jtZauhcxJdCIa6Mx5uBddGzr50rfVfcuvMKntvSM35Zb4t/RQTrpLQtMMmfAZAmvTX C3/2qGu0x3Dq0SjPszyfekA4PFDFWdnKsizkNMbInNKx0Aa1f4eWA579ZPDQYcBaC+hv DYYk0EkzSDZrhfHvX/jk02HdEjluhtP4tMHag+V+lJyXH1CcGCJNkiz1/akUe8+L0US0 6Mwco95klFFtDFepA2X1pQdwAomi14jtBUjHiMFonqUfwwFjQGwx0lYhAyLEDRgxAlbG EIdS3uJMX65hOWb4lOBYVL7FEBW8wuLM7CNCS4eW1SN34e0zAIbfdMMEMYuCmx4sWvoX JTfg== X-Gm-Message-State: AOAM530xrP0N28CXF77yKYPUC0sXhf+GF2++LhyQ2ANG5ft3nBTHyon6 ZQqHqei3POKnE8iVXaTTnpbfsAA0b1rrFnyH X-Google-Smtp-Source: ABdhPJzwL0aLG/LFozEXKZCpc3YUpTiwsoD/EkJPVyuYh88UkHScEPkkQ1AfnKQLe+wuZHkESct5ew== X-Received: by 2002:a17:902:b113:b0:153:1d99:9cc7 with SMTP id q19-20020a170902b11300b001531d999cc7mr18253683plr.6.1648323713024; Sat, 26 Mar 2022 12:41:53 -0700 (PDT) Received: from localhost.localdomain ([116.75.119.161]) by smtp.gmail.com with ESMTPSA id k185-20020a6384c2000000b003821dcd9020sm8778784pgd.27.2022.03.26.12.41.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 26 Mar 2022 12:41:52 -0700 (PDT) From: Jagath Jog J To: dan@dlrobertson.com, jic23@kernel.org, andy.shevchenko@gmail.com Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/5] iio: accel: bma400: Fix the scale min and max macro values Date: Sun, 27 Mar 2022 01:11:42 +0530 Message-Id: <20220326194146.15549-2-jagathjog1996@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220326194146.15549-1-jagathjog1996@gmail.com> References: <20220326194146.15549-1-jagathjog1996@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Changing the scale macro values to match the bma400 sensitivity for 1 LSB of all the available ranges. Signed-off-by: Jagath Jog J --- drivers/iio/accel/bma400.h | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/drivers/iio/accel/bma400.h b/drivers/iio/accel/bma400.h index c4c8d74155c2..190366debdb3 100644 --- a/drivers/iio/accel/bma400.h +++ b/drivers/iio/accel/bma400.h @@ -83,8 +83,26 @@ #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 is populated into bma400_scales + * array by left shifting BMA400_SCALE_MIN. + * eg: + * 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 = 9677 << 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 -- 2.17.1