From patchwork Thu Nov 9 10:12:27 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnaud POULIQUEN X-Patchwork-Id: 10050713 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D47E8601EB for ; Thu, 9 Nov 2017 10:14:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C655629AC8 for ; Thu, 9 Nov 2017 10:14:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BA7E029ACC; Thu, 9 Nov 2017 10:14:57 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable 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 4D93D29AC8 for ; Thu, 9 Nov 2017 10:14:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751479AbdKIKO4 (ORCPT ); Thu, 9 Nov 2017 05:14:56 -0500 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:6549 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751182AbdKIKOz (ORCPT ); Thu, 9 Nov 2017 05:14:55 -0500 Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx08-.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id vA9A9I3Z027687; Thu, 9 Nov 2017 11:12:43 +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 2e43yhwrwh-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Thu, 09 Nov 2017 11:12:43 +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 1C3C73F; Thu, 9 Nov 2017 10:12:43 +0000 (GMT) Received: from Webmail-eu.st.com (Safex1hubcas21.st.com [10.75.90.44]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id E31C8268F; Thu, 9 Nov 2017 10:12:42 +0000 (GMT) Received: from SAFEX1HUBCAS22.st.com (10.75.90.93) by SAFEX1HUBCAS21.st.com (10.75.90.44) with Microsoft SMTP Server (TLS) id 14.3.352.0; Thu, 9 Nov 2017 11:12:42 +0100 Received: from localhost (10.201.23.162) by Webmail-ga.st.com (10.75.90.48) with Microsoft SMTP Server (TLS) id 14.3.352.0; Thu, 9 Nov 2017 11:12:42 +0100 From: Arnaud Pouliquen To: Rob Herring , Mark Rutland , Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , Jaroslav Kysela , Takashi Iwai , Liam Girdwood , Mark Brown CC: , , , , Maxime Coquelin , Alexandre Torgue , Subject: [PATCH v4 05/12] IIO: ADC: add sigma delta modulator support Date: Thu, 9 Nov 2017 11:12:27 +0100 Message-ID: <1510222354-15290-6-git-send-email-arnaud.pouliquen@st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1510222354-15290-1-git-send-email-arnaud.pouliquen@st.com> References: <1510222354-15290-1-git-send-email-arnaud.pouliquen@st.com> MIME-Version: 1.0 X-Originating-IP: [10.201.23.162] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-11-09_03:, , 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 Add generic driver to support sigma delta modulators. Signed-off-by: Arnaud Pouliquen --- drivers/iio/adc/Kconfig | 12 ++++++ drivers/iio/adc/Makefile | 1 + drivers/iio/adc/sd_adc_modulator.c | 82 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 95 insertions(+) create mode 100644 drivers/iio/adc/sd_adc_modulator.c diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 5762565..c5db62f 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -626,6 +626,18 @@ config SPEAR_ADC To compile this driver as a module, choose M here: the module will be called spear_adc. +config SD_ADC_MODULATOR + tristate "Generic sigma delta modulator" + depends on OF + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER + help + Select this option to enables sigma delta modulator. This driver can + support generic sigma delta modulators. + + This driver can also be built as a module. If so, the module + will be called sd_adc_modulator. + config STM32_ADC_CORE tristate "STMicroelectronics STM32 adc core" depends on ARCH_STM32 || COMPILE_TEST diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index 9874e05..d800325 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -81,3 +81,4 @@ obj-$(CONFIG_VF610_ADC) += vf610_adc.o obj-$(CONFIG_VIPERBOARD_ADC) += viperboard_adc.o xilinx-xadc-y := xilinx-xadc-core.o xilinx-xadc-events.o obj-$(CONFIG_XILINX_XADC) += xilinx-xadc.o +obj-$(CONFIG_SD_ADC_MODULATOR) += sd_adc_modulator.o diff --git a/drivers/iio/adc/sd_adc_modulator.c b/drivers/iio/adc/sd_adc_modulator.c new file mode 100644 index 0000000..ff2504a --- /dev/null +++ b/drivers/iio/adc/sd_adc_modulator.c @@ -0,0 +1,82 @@ +/* + * Generic sigma delta modulator driver + * + * Copyright (C) 2017, STMicroelectronics - All Rights Reserved + * Author: Arnaud Pouliquen . + * + * License type: GPLv2 + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. + * See the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see . + */ + +#include +#include +#include +#include + +static const struct iio_info iio_sd_mod_iio_info; + +static const struct iio_chan_spec iio_sd_mod_ch = { + .type = IIO_VOLTAGE, + .indexed = 1, + .scan_index = 0, + .scan_type = { + .sign = 'u', + .realbits = 1, + .shift = 0, + }, +}; + +static int iio_sd_mod_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct iio_dev *iio; + + iio = devm_iio_device_alloc(dev, 0); + if (!iio) + return -ENOMEM; + + iio->dev.parent = dev; + iio->dev.of_node = dev->of_node; + iio->name = dev_name(dev); + iio->info = &iio_sd_mod_iio_info; + iio->modes = INDIO_BUFFER_HARDWARE; + + iio->num_channels = 1; + iio->channels = &iio_sd_mod_ch; + + platform_set_drvdata(pdev, iio); + + return devm_iio_device_register(&pdev->dev, iio); +} + +static const struct of_device_id sd_adc_of_match[] = { + { .compatible = "sd-modulator" }, + { .compatible = "ads1201" }, + { } +}; +MODULE_DEVICE_TABLE(of, sd_adc_of_match); + +static struct platform_driver iio_sd_mod_adc = { + .driver = { + .name = "iio_sd_adc_mod", + .of_match_table = of_match_ptr(sd_adc_of_match), + }, + .probe = iio_sd_mod_probe, +}; + +module_platform_driver(iio_sd_mod_adc); + +MODULE_DESCRIPTION("Basic sigma delta modulator"); +MODULE_AUTHOR("Arnaud Pouliquen "); +MODULE_LICENSE("GPL v2");