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 X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,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 45777C43381 for ; Fri, 22 Mar 2019 11:11:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 10BAD2082C for ; Fri, 22 Mar 2019 11:11:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728128AbfCVLLe (ORCPT ); Fri, 22 Mar 2019 07:11:34 -0400 Received: from relay4-d.mail.gandi.net ([217.70.183.196]:42205 "EHLO relay4-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728020AbfCVLLe (ORCPT ); Fri, 22 Mar 2019 07:11:34 -0400 X-Originating-IP: 109.213.38.144 Received: from localhost (alyon-652-1-47-144.w109-213.abo.wanadoo.fr [109.213.38.144]) (Authenticated sender: gregory.clement@bootlin.com) by relay4-d.mail.gandi.net (Postfix) with ESMTPSA id 4A8A1E0004; Fri, 22 Mar 2019 11:11:29 +0000 (UTC) From: Gregory CLEMENT To: Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , linux-iio@vger.kernel.org Cc: Rob Herring , devicetree@vger.kernel.org, Thomas Petazzoni , linux-arm-kernel@lists.infradead.org, Alexandre Belloni , Gregory CLEMENT Subject: [PATCH v2 2/2] iio: adc: Add driver for the TI ADS8344 A/DC chips Date: Fri, 22 Mar 2019 12:11:08 +0100 Message-Id: <20190322111108.19383-3-gregory.clement@bootlin.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190322111108.19383-1-gregory.clement@bootlin.com> References: <20190322111108.19383-1-gregory.clement@bootlin.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org This adds support for the Texas Instruments ADS8344 ADC chip. This chip has a 16-bit 8-Channel ADC and is access directly through SPI. Signed-off-by: Gregory CLEMENT --- drivers/iio/adc/Kconfig | 10 ++ drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ti-ads8344.c | 200 +++++++++++++++++++++++++++++++++++ 3 files changed, 211 insertions(+) create mode 100644 drivers/iio/adc/ti-ads8344.c diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 76db6e5cc296..447d3a871746 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -967,6 +967,16 @@ config TI_ADS7950 To compile this driver as a module, choose M here: the module will be called ti-ads7950. +config TI_ADS8344 + tristate "Texas Instruments ADS8344" + depends on SPI && OF + help + If you say yes here you get support for Texas Instruments ADS8344 + ADC chips + + This driver can also be built as a module. If so, the module will be + called ti-ads8344. + config TI_ADS8688 tristate "Texas Instruments ADS8688" depends on SPI && OF diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index 6fcebd167524..1f3ae934111d 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -87,6 +87,7 @@ obj-$(CONFIG_TI_ADC128S052) += ti-adc128s052.o obj-$(CONFIG_TI_ADC161S626) += ti-adc161s626.o obj-$(CONFIG_TI_ADS1015) += ti-ads1015.o obj-$(CONFIG_TI_ADS7950) += ti-ads7950.o +obj-$(CONFIG_TI_ADS8344) += ti-ads8344.o obj-$(CONFIG_TI_ADS8688) += ti-ads8688.o obj-$(CONFIG_TI_ADS124S08) += ti-ads124s08.o obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o diff --git a/drivers/iio/adc/ti-ads8344.c b/drivers/iio/adc/ti-ads8344.c new file mode 100644 index 000000000000..649ed05bf1c9 --- /dev/null +++ b/drivers/iio/adc/ti-ads8344.c @@ -0,0 +1,200 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * ADS8344 16-bit 8-Channel ADC driver + * + * Author: Gregory CLEMENT + * + * Datasheet: http://www.ti.com/lit/ds/symlink/ads8344.pdf + */ + +#include +#include +#include +#include +#include +#include + +#define ADS8344_START BIT(7) +#define ADS8344_SINGLE_END BIT(2) +#define ADS8344_CHANNEL(channel) ((channel) << 4) +#define ADS8344_CLOCK_INTERNAL 0x2 /* PD1 = 1 and PD0 = 0 */ + +struct ads8344 { + struct spi_device *spi; + struct regulator *reg; + struct mutex lock; + + u8 tx_buf ____cacheline_aligned; + u16 rx_buf; +}; + +#define ADS8344_VOLTAGE_CHANNEL(chan, si) \ + { \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .channel = chan, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + } + +#define ADS8344_VOLTAGE_CHANNEL_DIFF(chan1, chan2, si) \ + { \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .channel = (chan1), \ + .channel2 = (chan2), \ + .differential = 1, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + } + +static const struct iio_chan_spec ads8344_channels[] = { + ADS8344_VOLTAGE_CHANNEL(0, 0), + ADS8344_VOLTAGE_CHANNEL(1, 4), + ADS8344_VOLTAGE_CHANNEL(2, 1), + ADS8344_VOLTAGE_CHANNEL(3, 5), + ADS8344_VOLTAGE_CHANNEL(4, 2), + ADS8344_VOLTAGE_CHANNEL(5, 6), + ADS8344_VOLTAGE_CHANNEL(6, 3), + ADS8344_VOLTAGE_CHANNEL(7, 7), + ADS8344_VOLTAGE_CHANNEL_DIFF(0, 1, 8), + ADS8344_VOLTAGE_CHANNEL_DIFF(2, 3, 9), + ADS8344_VOLTAGE_CHANNEL_DIFF(4, 5, 10), + ADS8344_VOLTAGE_CHANNEL_DIFF(6, 7, 11), + ADS8344_VOLTAGE_CHANNEL_DIFF(1, 0, 12), + ADS8344_VOLTAGE_CHANNEL_DIFF(3, 2, 13), + ADS8344_VOLTAGE_CHANNEL_DIFF(5, 4, 14), + ADS8344_VOLTAGE_CHANNEL_DIFF(7, 6, 15), +}; + +static int ads8344_adc_conversion(struct ads8344 *adc, int channel, + bool differential) +{ + struct spi_device *spi = adc->spi; + int ret; + + adc->tx_buf = ADS8344_START; + if (!differential) + adc->tx_buf |= ADS8344_SINGLE_END; + adc->tx_buf |= ADS8344_CHANNEL(channel); + adc->tx_buf |= ADS8344_CLOCK_INTERNAL; + + ret = spi_write(spi, &adc->tx_buf, 1); + if (ret) + return ret; + + udelay(9); + + ret = spi_read(spi, &adc->rx_buf, 2); + if (ret) + return ret; + + return adc->rx_buf; +} + +static int ads8344_read_raw(struct iio_dev *iio, + struct iio_chan_spec const *channel, int *value, + int *shift, long mask) +{ + struct ads8344 *adc = iio_priv(iio); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + mutex_lock(&adc->lock); + *value = ads8344_adc_conversion(adc, channel->scan_index, + channel->differential); + mutex_unlock(&adc->lock); + if (*value < 0) + return *value; + + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + *value = regulator_get_voltage(adc->reg); + if (*value < 0) + return *value; + + /* convert regulator output voltage to mV */ + *value /= 1000; + *shift = 16; + + return IIO_VAL_FRACTIONAL_LOG2; + default: + return -EINVAL; + } +} + +static const struct iio_info ads8344_info = { + .read_raw = ads8344_read_raw, +}; + +static int ads8344_probe(struct spi_device *spi) +{ + struct iio_dev *indio_dev; + struct ads8344 *adc; + int ret; + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc)); + if (!indio_dev) + return -ENOMEM; + + adc = iio_priv(indio_dev); + adc->spi = spi; + mutex_init(&adc->lock); + + indio_dev->name = dev_name(&spi->dev); + indio_dev->dev.parent = &spi->dev; + indio_dev->dev.of_node = spi->dev.of_node; + indio_dev->info = &ads8344_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = ads8344_channels; + indio_dev->num_channels = ARRAY_SIZE(ads8344_channels); + + adc->reg = devm_regulator_get(&spi->dev, "vref"); + if (IS_ERR(adc->reg)) + return PTR_ERR(adc->reg); + + ret = regulator_enable(adc->reg); + if (ret) + return ret; + + spi_set_drvdata(spi, indio_dev); + + ret = iio_device_register(indio_dev); + if (ret) { + regulator_disable(adc->reg); + return ret; + } + + return 0; +} + +static int ads8344_remove(struct spi_device *spi) +{ + struct iio_dev *indio_dev = spi_get_drvdata(spi); + struct ads8344 *adc = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + regulator_disable(adc->reg); + + return 0; +} + +static const struct of_device_id ads8344_of_match[] = { + { .compatible = "ti,ads8344", }, + {} +}; +MODULE_DEVICE_TABLE(of, ads8344_dt_ids); + +static struct spi_driver ads8344_driver = { + .driver = { + .name = "ads8344", + .of_match_table = ads8344_of_match, + }, + .probe = ads8344_probe, + .remove = ads8344_remove, +}; +module_spi_driver(ads8344_driver); + +MODULE_AUTHOR("Gregory CLEMENT "); +MODULE_DESCRIPTION("ADS8344 driver"); +MODULE_LICENSE("GPL v2"); -- 2.20.1