From patchwork Thu Jul 15 03:12:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liam Beguin X-Patchwork-Id: 12378355 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 04922C1B08C for ; Thu, 15 Jul 2021 03:12:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DFF5D613A9 for ; Thu, 15 Jul 2021 03:12:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233210AbhGODPe (ORCPT ); Wed, 14 Jul 2021 23:15:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39152 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233203AbhGODPe (ORCPT ); Wed, 14 Jul 2021 23:15:34 -0400 Received: from mail-qv1-xf35.google.com (mail-qv1-xf35.google.com [IPv6:2607:f8b0:4864:20::f35]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 320B8C061762; Wed, 14 Jul 2021 20:12:40 -0700 (PDT) Received: by mail-qv1-xf35.google.com with SMTP id i4so2147996qvq.10; Wed, 14 Jul 2021 20:12:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=zhQeMelYWNMHpFAMGtlyl1sUbg34IFFWmo4FOYtEzaY=; b=ktixEYDEVNnbF74lVxjv9jgUdBZOLbrHEfbaIXe+S9yjG0+RMCXjpopBCzHmDxq+6R Dj4c+QK0cQtwkV6/ZV8sPSZILtTLZhP3I6SUxzjiRsGgGTz5kxfmQ98IlJbfAboD73OK owzBT9PM9wsTNlLdKyLSDa1/kqLWr1jVNNp1Y9K+6bGERaA/I9RaGF4ERnBmdM5l1Jca FrGwtJktm08v2gmdEJO9Q+bVY6emN4jU2B4igq+HUKHWqftSMZLq1vLUxHZCGkAbjYFx lU/6qWidSu+UTMtSz3pJwg95vXnZpAMCS43ZBjQQaY/pGzp9veUh9hSfcRUFsyMRm7F4 Cvqg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=zhQeMelYWNMHpFAMGtlyl1sUbg34IFFWmo4FOYtEzaY=; b=ASmFYITtJ/CPlyzSFvO6llvfygHsXMPfLjj4g9136rBS59ahfkl+tZBGDwVETFBb0R t7IahSX/RCTJrFXiroZggYCq7ojS6vV76BvTZOUbjgNhIZuOmKuO+5EZrh/jsD3fVTwD hkaqjR95crbk71zXZEzj07JU8thSa6lKKRFZkrJKdXW+lKd5VPghuOdiF5PN9qeYt7Ze WXJ9WAnokCTg9o/NJng2bfSWCGX5GRKWmtns0Vv1TyZb7OQlSm+8v5wsRAk9/cYLg1TF pBy2P1z2WC58pIanHOiu3AE6/FmPR7S21JofzDWXr6CkjIiPu1YPtwU89Mrh2y/GoBWf iQFA== X-Gm-Message-State: AOAM531/EnRiIft81cH4Hpeu1b/SZGfnElOF8akZ3bYsJzqgLNOOuj+L STEd6Fhn/I7+IheO2QuWj6s= X-Google-Smtp-Source: ABdhPJzIMh0zeoSBwJFrjf+LAo5y5X5Bp0wecd1qRUmjTxiQne/KjylzYcrTCoO/vvCTPM0RQZZfiQ== X-Received: by 2002:ad4:5ca6:: with SMTP id q6mr1604863qvh.23.1626318759467; Wed, 14 Jul 2021 20:12:39 -0700 (PDT) Received: from shaak.. (198-48-202-89.cpe.pppoe.ca. [198.48.202.89]) by smtp.gmail.com with ESMTPSA id t125sm1932847qkf.41.2021.07.14.20.12.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Jul 2021 20:12:39 -0700 (PDT) From: Liam Beguin To: liambeguin@gmail.com, peda@axentia.se, jic23@kernel.org, lars@metafoo.de, pmeerw@pmeerw.net Cc: linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, robh+dt@kernel.org Subject: [PATCH v5 03/10] iio: inkern: make a best effort on offset calculation Date: Wed, 14 Jul 2021 23:12:08 -0400 Message-Id: <20210715031215.1534938-4-liambeguin@gmail.com> X-Mailer: git-send-email 2.30.1.489.g328c10930387 In-Reply-To: <20210715031215.1534938-1-liambeguin@gmail.com> References: <20210715031215.1534938-1-liambeguin@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org From: Liam Beguin iio_convert_raw_to_processed_unlocked() assumes the offset is an integer. Make a best effort to get a valid offset value for fractional cases without breaking implicit truncations. Fixes: 48e44ce0f881 ("iio:inkern: Add function to read the processed value") Signed-off-by: Liam Beguin --- drivers/iio/inkern.c | 32 +++++++++++++++++++++++++++----- 1 file changed, 27 insertions(+), 5 deletions(-) diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index b69027690ed5..5e74d8983874 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -578,13 +578,35 @@ EXPORT_SYMBOL_GPL(iio_read_channel_average_raw); static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan, int raw, int *processed, unsigned int scale) { - int scale_type, scale_val, scale_val2, offset; + int scale_type, scale_val, scale_val2; + int offset_type, offset_val, offset_val2; s64 raw64 = raw; - int ret; - ret = iio_channel_read(chan, &offset, NULL, IIO_CHAN_INFO_OFFSET); - if (ret >= 0) - raw64 += offset; + offset_type = iio_channel_read(chan, &offset_val, &offset_val2, + IIO_CHAN_INFO_OFFSET); + if (offset_type >= 0) { + switch (offset_type) { + case IIO_VAL_INT: + break; + case IIO_VAL_INT_PLUS_MICRO: + case IIO_VAL_INT_PLUS_NANO: + /* + * Both IIO_VAL_INT_PLUS_MICRO and IIO_VAL_INT_PLUS_NANO + * implicitely truncate the offset to it's integer form. + */ + break; + case IIO_VAL_FRACTIONAL: + offset_val /= offset_val2; + break; + case IIO_VAL_FRACTIONAL_LOG2: + offset_val /= (1 << offset_val2); + break; + default: + return -EINVAL; + } + + raw64 += offset_val; + } scale_type = iio_channel_read(chan, &scale_val, &scale_val2, IIO_CHAN_INFO_SCALE);