From patchwork Wed Mar 6 08:55:24 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabrice Gasnier X-Patchwork-Id: 10840593 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id F09291390 for ; Wed, 6 Mar 2019 08:56:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DD80B2BE02 for ; Wed, 6 Mar 2019 08:56:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CF1172C155; Wed, 6 Mar 2019 08:56:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 73AD52BE02 for ; Wed, 6 Mar 2019 08:56:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729150AbfCFI4R (ORCPT ); Wed, 6 Mar 2019 03:56:17 -0500 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:20649 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728438AbfCFI4R (ORCPT ); Wed, 6 Mar 2019 03:56:17 -0500 Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx08-00178001.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x268sqWW015101; Wed, 6 Mar 2019 09:55:55 +0100 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx08-00178001.pphosted.com with ESMTP id 2qyhgaxr3x-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Wed, 06 Mar 2019 09:55:55 +0100 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id A8F353A; Wed, 6 Mar 2019 08:55:53 +0000 (GMT) Received: from Webmail-eu.st.com (sfhdag5node3.st.com [10.75.127.15]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 67E5E2409; Wed, 6 Mar 2019 08:55:53 +0000 (GMT) Received: from localhost (10.75.127.45) by SFHDAG5NODE3.st.com (10.75.127.15) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Wed, 6 Mar 2019 09:55:52 +0100 From: Fabrice Gasnier To: CC: , , , , , , , , , , , Subject: [PATCH 8/8] iio: adc: stm32-dfsdm: claim direct mode for raw read and settings Date: Wed, 6 Mar 2019 09:55:24 +0100 Message-ID: <1551862524-25098-9-git-send-email-fabrice.gasnier@st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1551862524-25098-1-git-send-email-fabrice.gasnier@st.com> References: <1551862524-25098-1-git-send-email-fabrice.gasnier@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.45] X-ClientProxiedBy: SFHDAG4NODE2.st.com (10.75.127.11) To SFHDAG5NODE3.st.com (10.75.127.15) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-03-06_04:,, signatures=0 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Claim direct mode to ensure no buffer mode is in use for: - single conversion - sample rate setting (must be set when filter isn't enabled). - oversampling ratio (must be set when filter isn't enabled). Signed-off-by: Fabrice Gasnier --- drivers/iio/adc/stm32-dfsdm-adc.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c index 51688eb..ca42946 100644 --- a/drivers/iio/adc/stm32-dfsdm-adc.c +++ b/drivers/iio/adc/stm32-dfsdm-adc.c @@ -1039,16 +1039,23 @@ static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev, switch (mask) { case IIO_CHAN_INFO_OVERSAMPLING_RATIO: + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; ret = stm32_dfsdm_set_osrs(fl, 0, val); if (!ret) adc->oversamp = val; - + iio_device_release_direct_mode(indio_dev); return ret; case IIO_CHAN_INFO_SAMP_FREQ: if (!val) return -EINVAL; + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + switch (ch->src) { case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL: spi_freq = adc->dfsdm->spi_master_freq; @@ -1070,9 +1077,11 @@ static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev, if (ret < 0) { dev_err(&indio_dev->dev, "Not able to find parameter that match!\n"); + iio_device_release_direct_mode(indio_dev); return ret; } adc->sample_freq = val; + iio_device_release_direct_mode(indio_dev); return 0; } @@ -1089,11 +1098,15 @@ static int stm32_dfsdm_read_raw(struct iio_dev *indio_dev, switch (mask) { case IIO_CHAN_INFO_RAW: + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; ret = iio_hw_consumer_enable(adc->hwc); if (ret < 0) { dev_err(&indio_dev->dev, "%s: IIO enable failed (channel %d)\n", __func__, chan->channel); + iio_device_release_direct_mode(indio_dev); return ret; } ret = stm32_dfsdm_single_conv(indio_dev, chan, val); @@ -1102,8 +1115,10 @@ static int stm32_dfsdm_read_raw(struct iio_dev *indio_dev, dev_err(&indio_dev->dev, "%s: Conversion failed (channel %d)\n", __func__, chan->channel); + iio_device_release_direct_mode(indio_dev); return ret; } + iio_device_release_direct_mode(indio_dev); return IIO_VAL_INT; case IIO_CHAN_INFO_OVERSAMPLING_RATIO: