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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AF61EC433EF for ; Mon, 18 Oct 2021 13:43:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9295C61A55 for ; Mon, 18 Oct 2021 13:43:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231908AbhJRNpQ (ORCPT ); Mon, 18 Oct 2021 09:45:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:36772 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232160AbhJRNnL (ORCPT ); Mon, 18 Oct 2021 09:43:11 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D26F46103D; Mon, 18 Oct 2021 13:34:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1634564075; bh=lZ6e+SSnM1TUAUTuKQCwy6hZ3pcXZx5MHel341hCe4Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vn6/67x7vBDwsqZJmbbEqbBKPzM8FeHcIW6/RfuD9h6fSQEZ15H4Dhn7TtrsrXzCQ C9J0oR50X44HPVhNElPwoX0iTpS4pxiz4ybkgHjqa1CHGdhRftAAAgmpUWu0o2U8Zi 4sMU5iVJmwY84RZn3QBIphTOXDMrziEciDYxC5QM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hui Liu , Stable@vger.kernel.org, Jonathan Cameron Subject: [PATCH 5.10 056/103] iio: mtk-auxadc: fix case IIO_CHAN_INFO_PROCESSED Date: Mon, 18 Oct 2021 15:24:32 +0200 Message-Id: <20211018132336.639643062@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211018132334.702559133@linuxfoundation.org> References: <20211018132334.702559133@linuxfoundation.org> User-Agent: quilt/0.66 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: Hui Liu commit c2980c64c7fd4585d684574c92d1624d44961edd upstream. The previous driver does't apply the necessary scaling to take the voltage range into account. We change readback value from raw data to input voltage to fix case IIO_CHAN_INFO_PROCESSED. Fixes: ace4cdfe67be ("iio: adc: mt2701: Add Mediatek auxadc driver for mt2701.") Signed-off-by: Hui Liu Link: https://lore.kernel.org/r/20210926073028.11045-2-hui.liu@mediatek.com Cc: Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/adc/mt6577_auxadc.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- 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 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 } 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: