From patchwork Tue Aug 31 05:42:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hui Liu X-Patchwork-Id: 12466441 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_GIT autolearn=ham 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 1914CC432BE for ; Tue, 31 Aug 2021 05:42:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 030D060F6B for ; Tue, 31 Aug 2021 05:42:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238543AbhHaFnS (ORCPT ); Tue, 31 Aug 2021 01:43:18 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:45024 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S231537AbhHaFnR (ORCPT ); Tue, 31 Aug 2021 01:43:17 -0400 X-UUID: b99fd11d34b1416bbf87eb586268cf6e-20210831 X-UUID: b99fd11d34b1416bbf87eb586268cf6e-20210831 Received: from mtkcas11.mediatek.inc [(172.21.101.40)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1443729322; Tue, 31 Aug 2021 13:42:18 +0800 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs07n1.mediatek.inc (172.21.101.16) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 31 Aug 2021 13:42:17 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 31 Aug 2021 13:42:16 +0800 From: Hui Liu To: , , , CC: , , , , , , , , , , , , , Subject: [PATCH v2 1/1] iio: mtk-auxadc: update case IIO_CHAN_INFO_PROCESSED Date: Tue, 31 Aug 2021 13:42:07 +0800 Message-ID: <20210831054207.13236-2-hui.liu@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20210831054207.13236-1-hui.liu@mediatek.com> References: <20210831054207.13236-1-hui.liu@mediatek.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Convert raw data to processed data, the processed data is input voltage. Signed-off-by: Hui Liu --- drivers/iio/adc/mt6577_auxadc.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/iio/adc/mt6577_auxadc.c b/drivers/iio/adc/mt6577_auxadc.c index 79c1dd68b909..d4fccd52ef08 100644 --- a/drivers/iio/adc/mt6577_auxadc.c +++ b/drivers/iio/adc/mt6577_auxadc.c @@ -82,6 +82,10 @@ static const struct iio_chan_spec mt6577_auxadc_iio_channels[] = { MT6577_AUXADC_CHANNEL(15), }; +/* For Voltage calculation */ +#define VOLTAGE_FULL_RANGE 1500 /* VA voltage */ +#define AUXADC_PRECISE 4096 /* 12 bits */ + static int mt_auxadc_get_cali_data(int rawdata, bool enable_cali) { return rawdata; @@ -191,6 +195,10 @@ static int mt6577_auxadc_read_raw(struct iio_dev *indio_dev, } if (adc_dev->dev_comp->sample_data_cali) *val = mt_auxadc_get_cali_data(*val, true); + + /* Convert adc raw data to voltage: 0 - 1500 mV */ + *val = *val * VOLTAGE_FULL_RANGE / AUXADC_PRECISE; + return IIO_VAL_INT; default: