From patchwork Mon Apr 11 20:31:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jagath Jog J X-Patchwork-Id: 12809613 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 3C965C433F5 for ; Mon, 11 Apr 2022 20:31:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231363AbiDKUd6 (ORCPT ); Mon, 11 Apr 2022 16:33:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53704 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349795AbiDKUd4 (ORCPT ); Mon, 11 Apr 2022 16:33:56 -0400 Received: from mail-pj1-x102e.google.com (mail-pj1-x102e.google.com [IPv6:2607:f8b0:4864:20::102e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 29CD035DD3; Mon, 11 Apr 2022 13:31:41 -0700 (PDT) Received: by mail-pj1-x102e.google.com with SMTP id e8-20020a17090a118800b001cb13402ea2so519868pja.0; Mon, 11 Apr 2022 13:31:41 -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=XLIAY+sHtftiUozOfh7PpmrA81WZfIdoHm67TMrq4Jo=; b=cOZ0d8JaHJWYIzJBXu2RbX1g5Xjeh6e5I3TV34aSgTWP2v6n8i/0N2DFAx3NkWQ2Tc rJhHTIMN7ORcusaw6WqjkvOLuEamcU/l68roG+0ypF1YDum90UbaiFo2p+/zMemKlMb/ vYJ0eQF9JX05x8qZCkKSGfWKTQr8GszA54Ac6ARyR/5JQMgDCMRm2F40ZNzGvuBd+SxF g0LcqQja5DiLw8kbANSjGlIcU3C6UgwHEwldxeBxyChbr8drRzGcaWCFt2pOsLM5TADj ARqD8DoalbHPk2VGCse2asFJfvxXIqBHlsxPEFyDqTr5Lxqny9YjWX1C71ophRJnfceg TjsA== 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=XLIAY+sHtftiUozOfh7PpmrA81WZfIdoHm67TMrq4Jo=; b=v58lfQbjb+FhjE5UA37aJOUnN4zHrtuhsD+tzIQOQ7T0u9hpGmbdYaVTeUP7e+0LEK Qmb6mq6b3I/j8Vyw0WOVAKUXaAV1YvL/UbwjQYjD5tnEuK9FBGakiS0h+5lVJ8ZjiMTE Wx2peGTnmxxIVnpcl3zXGnCv0uQqOUMnzlqwOMMwZM+hu3Aa5on9dkmNgNaU5OT934Yt vQM5CUr1KecrFueIf56kOZOxUBkDcvmQ+fGASs8qLk82acHG7FLrEgpVwN+y+T81Qfcp VWyf8i2MV0GSL9PFAVVwX1qcWm4H0vdSr6cRamqZuRM8/fNqSPzbDkeZkKEETQE6t/Q8 Y5Aw== X-Gm-Message-State: AOAM5334hTsrWHX5Bdm4EtqrYjklVlCx60TVYhiOu+vCfTbkxIaUz0AE KfM6vhrliU7mj4jwGOa0N4w= X-Google-Smtp-Source: ABdhPJxtrndmMLAR1wJaZNppLmgQ91Kk7Y+BuJIdwSnzeRQlOrEOZDtQ/qgG6qAxILTRuPRL7gp4Cg== X-Received: by 2002:a17:902:b692:b0:151:5474:d3ee with SMTP id c18-20020a170902b69200b001515474d3eemr34129394pls.139.1649709100606; Mon, 11 Apr 2022 13:31:40 -0700 (PDT) Received: from localhost.localdomain ([27.7.99.112]) by smtp.gmail.com with ESMTPSA id z15-20020a056a001d8f00b004fda37855ddsm34069828pfw.168.2022.04.11.13.31.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Apr 2022 13:31:40 -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 v3 1/9] iio: accel: bma400: Fix the scale min and max macro values Date: Tue, 12 Apr 2022 02:01:25 +0530 Message-Id: <20220411203133.19929-2-jagathjog1996@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220411203133.19929-1-jagathjog1996@gmail.com> References: <20220411203133.19929-1-jagathjog1996@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-iio@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 | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/drivers/iio/accel/bma400.h b/drivers/iio/accel/bma400.h index c4c8d74155c2..5d6a1976503f 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 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 = 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