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 D9610C433EF for ; Mon, 18 Oct 2021 13:35:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C77F0613D2 for ; Mon, 18 Oct 2021 13:35:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232195AbhJRNhw (ORCPT ); Mon, 18 Oct 2021 09:37:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:54404 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233205AbhJRNfr (ORCPT ); Mon, 18 Oct 2021 09:35:47 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 62DE5613B1; Mon, 18 Oct 2021 13:30:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1634563854; bh=lZ6e+SSnM1TUAUTuKQCwy6hZ3pcXZx5MHel341hCe4Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GqDRo3rGKnwVzU4BuyGXkTNZkwgXJBDQbTm6ho26Dt67zZjgQybVwyUYKprQJE5qo vMQmw/BJdFUrIpSE54oBzVdK2osGubov/xcOB9L9TP9N56WE3WrpwlOPoHngiY7TRT CpgjgOrOZJ793g0TLMKPg3SwVcY/VjpCnfVjjZwg= 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 5.4 40/69] iio: mtk-auxadc: fix case IIO_CHAN_INFO_PROCESSED Date: Mon, 18 Oct 2021 15:24:38 +0200 Message-Id: <20211018132330.801284592@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211018132329.453964125@linuxfoundation.org> References: <20211018132329.453964125@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: stable@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: