From patchwork Sun Jan 27 20:33:52 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Renato Lui Geh X-Patchwork-Id: 10783039 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 E482F6C2 for ; Sun, 27 Jan 2019 20:34:07 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C30F728708 for ; Sun, 27 Jan 2019 20:34:07 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B0D8E28720; Sun, 27 Jan 2019 20:34:07 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,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 4B91A28708 for ; Sun, 27 Jan 2019 20:34:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727114AbfA0UeF (ORCPT ); Sun, 27 Jan 2019 15:34:05 -0500 Received: from mail-qt1-f193.google.com ([209.85.160.193]:37637 "EHLO mail-qt1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727100AbfA0UeF (ORCPT ); Sun, 27 Jan 2019 15:34:05 -0500 Received: by mail-qt1-f193.google.com with SMTP id t33so16236146qtt.4; Sun, 27 Jan 2019 12:34:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:mime-version:content-disposition :user-agent; bh=Sd/RQcjjuPNj5NcKFm4raXNE0jijfWfY5j7kw7whCoY=; b=DudF2Nklry9KVdzr8EBTwslrx+PBZcskTx07eoKy2YBSyWUTKyREm2WHdxVXJeSa3S XUrAcgHa6abR8Ylkp840HPZ8SF81Bm2FL1Lu78B8wEbusfJUXTyqXwwqW64NrAFBwbf/ P7PGyG4Gb1gYcrgNE/CunZxybsYQhMKGpQ56e7Pnx8L4REgifYre/SQuz0ITwRbVrGLw F3NswACGWYoHKJIuApHDowHffqTooeQ3oziNQe2Lr3VLZ8ObcUi0CJz+rxQSytoerduT L/OOSggm2CtAIgJbFZoYgekWQ1LSvArgVuT6ofGg6ydJbLc3HSWghAgXyNiCA5qSBwxc NdDQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition:user-agent; bh=Sd/RQcjjuPNj5NcKFm4raXNE0jijfWfY5j7kw7whCoY=; b=fKgwTAviSNYbKy2alJpM5Y5C5ZT1+NLflENjWycIVzimmMGyM2uglxxll2CJpb1ZgD iyfGJjEnQm9f1MFGyugJnzUd1Cci1Dg5MwQmJDlSPYAXc9MaNvsYok8xfDBs8WH/WXqU X8uCqRRmViee++ZTWnLqs/U9E7q2VzFHUFSlHi5edORYd5+6vdwz9TORXIKsl/mq15Hr CMJQeNyKupLphqyYU0jc/f07QGk0cBdNuhYdvFZNdM9AKJiqegVX3fFcgRUL5q+cuP2F +YgpXiQyHWahyuicoUxr1UY3j4l+4wDCEjnZRFKFi5Sz8pHxTF5EB3kUYcd1zu0ABXO2 on6w== X-Gm-Message-State: AJcUukf62UWo/OaCaUJRkmSva/++vLNzdvX625psiCLNCvFS3U0biRZD zXRFnK/Gs7X+gh7GdhtQZqI= X-Google-Smtp-Source: ALg8bN7OnEnzWFBPUbG5WK24/UfnUFFDEzbBlzJcaGnmEIlfh2bNSIaNvHtGEMcpOLb4LtxBJv+Sfw== X-Received: by 2002:aed:3907:: with SMTP id l7mr19407483qte.65.1548621243124; Sun, 27 Jan 2019 12:34:03 -0800 (PST) Received: from renatolg ([186.220.19.121]) by smtp.gmail.com with ESMTPSA id f31sm77255476qtc.42.2019.01.27.12.33.55 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 27 Jan 2019 12:34:02 -0800 (PST) Date: Sun, 27 Jan 2019 18:33:52 -0200 From: Renato Lui Geh To: lars@metafoo.de, Michael.Hennerich@analog.com, jic23@kernel.org, knaack.h@gmx.de, pmeerw@pmeerw.net, gregkh@linuxfoundation.org, stefan.popa@analog.com, alexandru.Ardelean@analog.com, giuliano.belinassi@usp.br Cc: linux-iio@vger.kernel.org, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, kernel-usp@googlegroups.com Subject: [PATCH v2 2/2] staging: iio: ad7780: moving ad7780 out of staging Message-ID: <20190127203344.ofryhhrae2wjn6j2@renatolg> MIME-Version: 1.0 Content-Disposition: inline User-Agent: NeoMutt/20180716 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 Move ad7780 ADC driver out of staging and into the mainline. The ad7780 is a sigma-delta analog to digital converter. This driver provides reading voltage values and status bits from both the ad778x and ad717x series. Its interface also allows writing on the FILTER and GAIN GPIO pins on the ad778x. Signed-off-by: Renato Lui Geh Signed-off-by: Giuliano Belinassi Co-developed-by: Giuliano Belinassi --- Changes in v2: - Added information on the ad7780 driver in commit message - SPDX GPLv2 license - GPIO inits now come before regulator in probe drivers/iio/adc/Kconfig | 13 ++ drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ad7780.c | 361 ++++++++++++++++++++++++++++++ drivers/staging/iio/adc/Kconfig | 13 -- drivers/staging/iio/adc/Makefile | 1 - drivers/staging/iio/adc/ad7780.c | 362 ------------------------------- 6 files changed, 375 insertions(+), 376 deletions(-) create mode 100644 drivers/iio/adc/ad7780.c delete mode 100644 drivers/staging/iio/adc/ad7780.c diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index f3cc7a31bce5..2cdee166d0e9 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -108,6 +108,19 @@ config AD7766 To compile this driver as a module, choose M here: the module will be called ad7766. +config AD7780 + tristate "Analog Devices AD7780 and similar ADCs driver" + depends on SPI + depends on GPIOLIB || COMPILE_TEST + select AD_SIGMA_DELTA + help + Say yes here to build support for Analog Devices AD7170, AD7171, + AD7780 and AD7781 SPI analog to digital converters (ADC). + If unsure, say N (but it's safe to say "Y"). + + To compile this driver as a module, choose M here: the + module will be called ad7780. + config AD7791 tristate "Analog Devices AD7791 ADC driver" depends on SPI diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index ea5031348052..b48852157115 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_AD7606_IFACE_PARALLEL) += ad7606_par.o obj-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o obj-$(CONFIG_AD7606) += ad7606.o obj-$(CONFIG_AD7766) += ad7766.o +obj-$(CONFIG_AD7780) += ad7780.o obj-$(CONFIG_AD7791) += ad7791.o obj-$(CONFIG_AD7793) += ad7793.o obj-$(CONFIG_AD7887) += ad7887.o diff --git a/drivers/iio/adc/ad7780.c b/drivers/iio/adc/ad7780.c new file mode 100644 index 000000000000..db2360af82b7 --- /dev/null +++ b/drivers/iio/adc/ad7780.c @@ -0,0 +1,361 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * AD7170/AD7171 and AD7780/AD7781 SPI ADC driver + * + * Copyright 2011 Analog Devices Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#define AD7780_RDY BIT(7) +#define AD7780_FILTER BIT(6) +#define AD7780_ERR BIT(5) +#define AD7780_ID1 BIT(4) +#define AD7780_ID0 BIT(3) +#define AD7780_GAIN BIT(2) +#define AD7780_PAT1 BIT(1) +#define AD7780_PAT0 BIT(0) + +#define AD7780_PATTERN (AD7780_PAT0) +#define AD7780_PATTERN_MASK (AD7780_PAT0 | AD7780_PAT1) + +#define AD7170_PAT2 BIT(2) + +#define AD7170_PATTERN (AD7780_PAT0 | AD7170_PAT2) +#define AD7170_PATTERN_MASK (AD7780_PAT0 | AD7780_PAT1 | AD7170_PAT2) + +#define AD7780_GAIN_GPIO 0 +#define AD7780_FILTER_GPIO 1 + +#define AD7780_GAIN_MIDPOINT 64 +#define AD7780_FILTER_MIDPOINT 13350 + +static const unsigned int ad778x_gain[2] = { 1, 128 }; +static const unsigned int ad778x_filter[2] = { 10000, 16700 }; + +struct ad7780_chip_info { + struct iio_chan_spec channel; + unsigned int pattern_mask; + unsigned int pattern; + bool is_ad778x; +}; + +struct ad7780_state { + const struct ad7780_chip_info *chip_info; + struct regulator *reg; + struct gpio_desc *powerdown_gpio; + struct gpio_desc *gain_gpio; + struct gpio_desc *filter_gpio; + unsigned int gain; + unsigned int filter; + unsigned int int_vref_mv; + + struct ad_sigma_delta sd; +}; + +enum ad7780_supported_device_ids { + ID_AD7170, + ID_AD7171, + ID_AD7780, + ID_AD7781, +}; + +static struct ad7780_state *ad_sigma_delta_to_ad7780(struct ad_sigma_delta *sd) +{ + return container_of(sd, struct ad7780_state, sd); +} + +static int ad7780_set_mode(struct ad_sigma_delta *sigma_delta, + enum ad_sigma_delta_mode mode) +{ + struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta); + unsigned int val; + + switch (mode) { + case AD_SD_MODE_SINGLE: + case AD_SD_MODE_CONTINUOUS: + val = 1; + break; + default: + val = 0; + break; + } + + gpiod_set_value(st->powerdown_gpio, val); + + return 0; +} + +static int ad7780_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long m) +{ + struct ad7780_state *st = iio_priv(indio_dev); + int voltage_uv; + + switch (m) { + case IIO_CHAN_INFO_RAW: + return ad_sigma_delta_single_conversion(indio_dev, chan, val); + case IIO_CHAN_INFO_SCALE: + voltage_uv = regulator_get_voltage(st->reg); + if (voltage_uv < 0) + return voltage_uv; + voltage_uv /= 1000; + *val = voltage_uv * st->gain; + *val2 = chan->scan_type.realbits - 1; + st->int_vref_mv = voltage_uv; + return IIO_VAL_FRACTIONAL_LOG2; + case IIO_CHAN_INFO_OFFSET: + *val = -(1 << (chan->scan_type.realbits - 1)); + return IIO_VAL_INT; + case IIO_CHAN_INFO_SAMP_FREQ: + *val = st->filter; + return IIO_VAL_INT; + } + + return -EINVAL; +} + +static int ad7780_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long m) +{ + struct ad7780_state *st = iio_priv(indio_dev); + const struct ad7780_chip_info *chip_info = st->chip_info; + int vref, gain; + unsigned int full_scale; + + if (!chip_info->is_ad778x) + return 0; + + switch (m) { + case IIO_CHAN_INFO_SCALE: + if (val != 0) + return -EINVAL; + + vref = st->int_vref_mv * 1000000LL; + full_scale = 1 << (chip_info->channel.scan_type.realbits - 1); + gain = DIV_ROUND_CLOSEST(vref, full_scale); + gain = DIV_ROUND_CLOSEST(gain, val2); + st->gain = gain; + if (gain < AD7780_GAIN_MIDPOINT) + gain = 0; + else + gain = 1; + gpiod_set_value(st->gain_gpio, gain); + break; + case IIO_CHAN_INFO_SAMP_FREQ: + if (1000*val + val2/1000 < AD7780_FILTER_MIDPOINT) + val = 0; + else + val = 1; + st->filter = ad778x_filter[val]; + gpiod_set_value(st->filter_gpio, val); + break; + } + + return 0; +} + +static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta, + unsigned int raw_sample) +{ + struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta); + const struct ad7780_chip_info *chip_info = st->chip_info; + + if ((raw_sample & AD7780_ERR) || + ((raw_sample & chip_info->pattern_mask) != chip_info->pattern)) + return -EIO; + + if (chip_info->is_ad778x) { + st->gain = ad778x_gain[raw_sample & AD7780_GAIN]; + st->filter = ad778x_filter[raw_sample & AD7780_FILTER]; + } + + return 0; +} + +static const struct ad_sigma_delta_info ad7780_sigma_delta_info = { + .set_mode = ad7780_set_mode, + .postprocess_sample = ad7780_postprocess_sample, + .has_registers = false, +}; + +#define AD7170_CHANNEL(bits, wordsize) \ + AD_SD_CHANNEL_NO_SAMP_FREQ(1, 0, 0, bits, 32, wordsize - bits) +#define AD7780_CHANNEL(bits, wordsize) \ + AD_SD_CHANNEL_GAIN_FILTER(1, 0, 0, bits, 32, wordsize - bits) + +static const struct ad7780_chip_info ad7780_chip_info_tbl[] = { + [ID_AD7170] = { + .channel = AD7170_CHANNEL(12, 24), + .pattern = AD7170_PATTERN, + .pattern_mask = AD7170_PATTERN_MASK, + .is_ad778x = false, + }, + [ID_AD7171] = { + .channel = AD7170_CHANNEL(16, 24), + .pattern = AD7170_PATTERN, + .pattern_mask = AD7170_PATTERN_MASK, + .is_ad778x = false, + }, + [ID_AD7780] = { + .channel = AD7780_CHANNEL(24, 32), + .pattern = AD7780_PATTERN, + .pattern_mask = AD7780_PATTERN_MASK, + .is_ad778x = true, + }, + [ID_AD7781] = { + .channel = AD7780_CHANNEL(20, 32), + .pattern = AD7780_PATTERN, + .pattern_mask = AD7780_PATTERN_MASK, + .is_ad778x = true, + }, +}; + +static const struct iio_info ad7780_info = { + .read_raw = ad7780_read_raw, + .write_raw = ad7780_write_raw, +}; + +static int ad7780_probe(struct spi_device *spi) +{ + struct ad7780_state *st; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + st = iio_priv(indio_dev); + st->gain = 1; + + ad_sd_init(&st->sd, indio_dev, spi, &ad7780_sigma_delta_info); + + st->chip_info = + &ad7780_chip_info_tbl[spi_get_device_id(spi)->driver_data]; + + spi_set_drvdata(spi, indio_dev); + + indio_dev->dev.parent = &spi->dev; + indio_dev->name = spi_get_device_id(spi)->name; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = &st->chip_info->channel; + indio_dev->num_channels = 1; + indio_dev->info = &ad7780_info; + + st->powerdown_gpio = devm_gpiod_get_optional(&spi->dev, + "powerdown", + GPIOD_OUT_LOW); + if (IS_ERR(st->powerdown_gpio)) { + ret = PTR_ERR(st->powerdown_gpio); + dev_err(&spi->dev, "Failed to request powerdown GPIO: %d\n", + ret); + return ret; + } + + if (st->chip_info->is_ad778x) { + st->gain_gpio = devm_gpiod_get_optional(&spi->dev, + "gain", + GPIOD_OUT_HIGH); + if (IS_ERR(st->gain_gpio)) { + ret = PTR_ERR(st->gain_gpio); + dev_err(&spi->dev, "Failed to request gain GPIO: %d\n", + ret); + return ret; + } + + st->filter_gpio = devm_gpiod_get_optional(&spi->dev, + "filter", + GPIOD_OUT_HIGH); + if (IS_ERR(st->filter_gpio)) { + ret = PTR_ERR(st->filter_gpio); + dev_err(&spi->dev, + "Failed to request filter GPIO: %d\n", + ret); + return ret; + } + } + + st->reg = devm_regulator_get(&spi->dev, "avdd"); + if (IS_ERR(st->reg)) + return PTR_ERR(st->reg); + + ret = regulator_enable(st->reg); + if (ret) { + dev_err(&spi->dev, "Failed to enable specified AVdd supply\n"); + goto error_disable_reg; + } + + ret = ad_sd_setup_buffer_and_trigger(indio_dev); + if (ret) + goto error_disable_reg; + + ret = iio_device_register(indio_dev); + if (ret) + goto error_cleanup_buffer_and_trigger; + + return 0; + +error_cleanup_buffer_and_trigger: + ad_sd_cleanup_buffer_and_trigger(indio_dev); +error_disable_reg: + regulator_disable(st->reg); + + return ret; +} + +static int ad7780_remove(struct spi_device *spi) +{ + struct iio_dev *indio_dev = spi_get_drvdata(spi); + struct ad7780_state *st = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + ad_sd_cleanup_buffer_and_trigger(indio_dev); + + regulator_disable(st->reg); + + return 0; +} + +static const struct spi_device_id ad7780_id[] = { + {"ad7170", ID_AD7170}, + {"ad7171", ID_AD7171}, + {"ad7780", ID_AD7780}, + {"ad7781", ID_AD7781}, + {} +}; +MODULE_DEVICE_TABLE(spi, ad7780_id); + +static struct spi_driver ad7780_driver = { + .driver = { + .name = "ad7780", + }, + .probe = ad7780_probe, + .remove = ad7780_remove, + .id_table = ad7780_id, +}; +module_spi_driver(ad7780_driver); + +MODULE_AUTHOR("Michael Hennerich "); +MODULE_DESCRIPTION("Analog Devices AD7780 and similar ADCs"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig index 7a93d3a5c113..404a53c743a6 100644 --- a/drivers/staging/iio/adc/Kconfig +++ b/drivers/staging/iio/adc/Kconfig @@ -3,19 +3,6 @@ # menu "Analog to digital converters" -config AD7780 - tristate "Analog Devices AD7780 and similar ADCs driver" - depends on SPI - depends on GPIOLIB || COMPILE_TEST - select AD_SIGMA_DELTA - help - Say yes here to build support for Analog Devices AD7170, AD7171, - AD7780 and AD7781 SPI analog to digital converters (ADC). - If unsure, say N (but it's safe to say "Y"). - - To compile this driver as a module, choose M here: the - module will be called ad7780. - config AD7816 tristate "Analog Devices AD7816/7/8 temperature sensor and ADC driver" depends on SPI diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile index 7a421088ff82..4b76769b32bc 100644 --- a/drivers/staging/iio/adc/Makefile +++ b/drivers/staging/iio/adc/Makefile @@ -3,7 +3,6 @@ # Makefile for industrial I/O ADC drivers # -obj-$(CONFIG_AD7780) += ad7780.o obj-$(CONFIG_AD7816) += ad7816.o obj-$(CONFIG_AD7192) += ad7192.o obj-$(CONFIG_AD7280) += ad7280a.o diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c deleted file mode 100644 index 82394e31b168..000000000000 --- a/drivers/staging/iio/adc/ad7780.c +++ /dev/null @@ -1,362 +0,0 @@ -/* - * AD7170/AD7171 and AD7780/AD7781 SPI ADC driver - * - * Copyright 2011 Analog Devices Inc. - * - * Licensed under the GPL-2. - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include - -#define AD7780_RDY BIT(7) -#define AD7780_FILTER BIT(6) -#define AD7780_ERR BIT(5) -#define AD7780_ID1 BIT(4) -#define AD7780_ID0 BIT(3) -#define AD7780_GAIN BIT(2) -#define AD7780_PAT1 BIT(1) -#define AD7780_PAT0 BIT(0) - -#define AD7780_PATTERN (AD7780_PAT0) -#define AD7780_PATTERN_MASK (AD7780_PAT0 | AD7780_PAT1) - -#define AD7170_PAT2 BIT(2) - -#define AD7170_PATTERN (AD7780_PAT0 | AD7170_PAT2) -#define AD7170_PATTERN_MASK (AD7780_PAT0 | AD7780_PAT1 | AD7170_PAT2) - -#define AD7780_GAIN_GPIO 0 -#define AD7780_FILTER_GPIO 1 - -#define AD7780_GAIN_MIDPOINT 64 -#define AD7780_FILTER_MIDPOINT 13350 - -static const unsigned int ad778x_gain[2] = { 1, 128 }; -static const unsigned int ad778x_filter[2] = { 10000, 16700 }; - -struct ad7780_chip_info { - struct iio_chan_spec channel; - unsigned int pattern_mask; - unsigned int pattern; - bool is_ad778x; -}; - -struct ad7780_state { - const struct ad7780_chip_info *chip_info; - struct regulator *reg; - struct gpio_desc *powerdown_gpio; - struct gpio_desc *gain_gpio; - struct gpio_desc *filter_gpio; - unsigned int gain; - unsigned int filter; - unsigned int int_vref_mv; - - struct ad_sigma_delta sd; -}; - -enum ad7780_supported_device_ids { - ID_AD7170, - ID_AD7171, - ID_AD7780, - ID_AD7781, -}; - -static struct ad7780_state *ad_sigma_delta_to_ad7780(struct ad_sigma_delta *sd) -{ - return container_of(sd, struct ad7780_state, sd); -} - -static int ad7780_set_mode(struct ad_sigma_delta *sigma_delta, - enum ad_sigma_delta_mode mode) -{ - struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta); - unsigned int val; - - switch (mode) { - case AD_SD_MODE_SINGLE: - case AD_SD_MODE_CONTINUOUS: - val = 1; - break; - default: - val = 0; - break; - } - - gpiod_set_value(st->powerdown_gpio, val); - - return 0; -} - -static int ad7780_read_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int *val, - int *val2, - long m) -{ - struct ad7780_state *st = iio_priv(indio_dev); - int voltage_uv; - - switch (m) { - case IIO_CHAN_INFO_RAW: - return ad_sigma_delta_single_conversion(indio_dev, chan, val); - case IIO_CHAN_INFO_SCALE: - voltage_uv = regulator_get_voltage(st->reg); - if (voltage_uv < 0) - return voltage_uv; - voltage_uv /= 1000; - *val = voltage_uv * st->gain; - *val2 = chan->scan_type.realbits - 1; - st->int_vref_mv = voltage_uv; - return IIO_VAL_FRACTIONAL_LOG2; - case IIO_CHAN_INFO_OFFSET: - *val = -(1 << (chan->scan_type.realbits - 1)); - return IIO_VAL_INT; - case IIO_CHAN_INFO_SAMP_FREQ: - *val = st->filter; - return IIO_VAL_INT; - } - - return -EINVAL; -} - -static int ad7780_write_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int val, - int val2, - long m) -{ - struct ad7780_state *st = iio_priv(indio_dev); - const struct ad7780_chip_info *chip_info = st->chip_info; - int vref, gain; - unsigned int full_scale; - - if (!chip_info->is_ad778x) - return 0; - - switch (m) { - case IIO_CHAN_INFO_SCALE: - if (val != 0) - return -EINVAL; - - vref = st->int_vref_mv * 1000000LL; - full_scale = 1 << (chip_info->channel.scan_type.realbits - 1); - gain = DIV_ROUND_CLOSEST(vref, full_scale); - gain = DIV_ROUND_CLOSEST(gain, val2); - st->gain = gain; - if (gain < AD7780_GAIN_MIDPOINT) - gain = 0; - else - gain = 1; - gpiod_set_value(st->gain_gpio, gain); - break; - case IIO_CHAN_INFO_SAMP_FREQ: - if (1000*val + val2/1000 < AD7780_FILTER_MIDPOINT) - val = 0; - else - val = 1; - st->filter = ad778x_filter[val]; - gpiod_set_value(st->filter_gpio, val); - break; - } - - return 0; -} - -static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta, - unsigned int raw_sample) -{ - struct ad7780_state *st = ad_sigma_delta_to_ad7780(sigma_delta); - const struct ad7780_chip_info *chip_info = st->chip_info; - - if ((raw_sample & AD7780_ERR) || - ((raw_sample & chip_info->pattern_mask) != chip_info->pattern)) - return -EIO; - - if (chip_info->is_ad778x) { - st->gain = ad778x_gain[raw_sample & AD7780_GAIN]; - st->filter = ad778x_filter[raw_sample & AD7780_FILTER]; - } - - return 0; -} - -static const struct ad_sigma_delta_info ad7780_sigma_delta_info = { - .set_mode = ad7780_set_mode, - .postprocess_sample = ad7780_postprocess_sample, - .has_registers = false, -}; - -#define AD7170_CHANNEL(bits, wordsize) \ - AD_SD_CHANNEL_NO_SAMP_FREQ(1, 0, 0, bits, 32, wordsize - bits) -#define AD7780_CHANNEL(bits, wordsize) \ - AD_SD_CHANNEL_GAIN_FILTER(1, 0, 0, bits, 32, wordsize - bits) - -static const struct ad7780_chip_info ad7780_chip_info_tbl[] = { - [ID_AD7170] = { - .channel = AD7170_CHANNEL(12, 24), - .pattern = AD7170_PATTERN, - .pattern_mask = AD7170_PATTERN_MASK, - .is_ad778x = false, - }, - [ID_AD7171] = { - .channel = AD7170_CHANNEL(16, 24), - .pattern = AD7170_PATTERN, - .pattern_mask = AD7170_PATTERN_MASK, - .is_ad778x = false, - }, - [ID_AD7780] = { - .channel = AD7780_CHANNEL(24, 32), - .pattern = AD7780_PATTERN, - .pattern_mask = AD7780_PATTERN_MASK, - .is_ad778x = true, - }, - [ID_AD7781] = { - .channel = AD7780_CHANNEL(20, 32), - .pattern = AD7780_PATTERN, - .pattern_mask = AD7780_PATTERN_MASK, - .is_ad778x = true, - }, -}; - -static const struct iio_info ad7780_info = { - .read_raw = ad7780_read_raw, - .write_raw = ad7780_write_raw, -}; - -static int ad7780_probe(struct spi_device *spi) -{ - struct ad7780_state *st; - struct iio_dev *indio_dev; - int ret; - - indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); - if (!indio_dev) - return -ENOMEM; - - st = iio_priv(indio_dev); - st->gain = 1; - - ad_sd_init(&st->sd, indio_dev, spi, &ad7780_sigma_delta_info); - - st->reg = devm_regulator_get(&spi->dev, "avdd"); - if (IS_ERR(st->reg)) - return PTR_ERR(st->reg); - - ret = regulator_enable(st->reg); - if (ret) { - dev_err(&spi->dev, "Failed to enable specified AVdd supply\n"); - return ret; - } - - st->chip_info = - &ad7780_chip_info_tbl[spi_get_device_id(spi)->driver_data]; - - spi_set_drvdata(spi, indio_dev); - - indio_dev->dev.parent = &spi->dev; - indio_dev->name = spi_get_device_id(spi)->name; - indio_dev->modes = INDIO_DIRECT_MODE; - indio_dev->channels = &st->chip_info->channel; - indio_dev->num_channels = 1; - indio_dev->info = &ad7780_info; - - st->powerdown_gpio = devm_gpiod_get_optional(&spi->dev, - "powerdown", - GPIOD_OUT_LOW); - if (IS_ERR(st->powerdown_gpio)) { - ret = PTR_ERR(st->powerdown_gpio); - dev_err(&spi->dev, "Failed to request powerdown GPIO: %d\n", - ret); - goto error_disable_reg; - } - - if (st->chip_info->is_ad778x) { - st->gain_gpio = devm_gpiod_get_optional(&spi->dev, - "gain", - GPIOD_OUT_HIGH); - if (IS_ERR(st->gain_gpio)) { - ret = PTR_ERR(st->gain_gpio); - dev_err(&spi->dev, "Failed to request gain GPIO: %d\n", - ret); - goto error_disable_reg; - } - - st->filter_gpio = devm_gpiod_get_optional(&spi->dev, - "filter", - GPIOD_OUT_HIGH); - if (IS_ERR(st->filter_gpio)) { - ret = PTR_ERR(st->filter_gpio); - dev_err(&spi->dev, - "Failed to request filter GPIO: %d\n", - ret); - goto error_disable_reg; - } - } - - ret = ad_sd_setup_buffer_and_trigger(indio_dev); - if (ret) - goto error_disable_reg; - - ret = iio_device_register(indio_dev); - if (ret) - goto error_cleanup_buffer_and_trigger; - - return 0; - -error_cleanup_buffer_and_trigger: - ad_sd_cleanup_buffer_and_trigger(indio_dev); -error_disable_reg: - regulator_disable(st->reg); - - return ret; -} - -static int ad7780_remove(struct spi_device *spi) -{ - struct iio_dev *indio_dev = spi_get_drvdata(spi); - struct ad7780_state *st = iio_priv(indio_dev); - - iio_device_unregister(indio_dev); - ad_sd_cleanup_buffer_and_trigger(indio_dev); - - regulator_disable(st->reg); - - return 0; -} - -static const struct spi_device_id ad7780_id[] = { - {"ad7170", ID_AD7170}, - {"ad7171", ID_AD7171}, - {"ad7780", ID_AD7780}, - {"ad7781", ID_AD7781}, - {} -}; -MODULE_DEVICE_TABLE(spi, ad7780_id); - -static struct spi_driver ad7780_driver = { - .driver = { - .name = "ad7780", - }, - .probe = ad7780_probe, - .remove = ad7780_remove, - .id_table = ad7780_id, -}; -module_spi_driver(ad7780_driver); - -MODULE_AUTHOR("Michael Hennerich "); -MODULE_DESCRIPTION("Analog Devices AD7780 and similar ADCs"); -MODULE_LICENSE("GPL v2");