From patchwork Thu Feb 28 14:26:08 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: 10833203 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 492341575 for ; Thu, 28 Feb 2019 14:26:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3212F2ECCA for ; Thu, 28 Feb 2019 14:26:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 25EF82ED00; Thu, 28 Feb 2019 14:26:46 +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 AABF52ECCA for ; Thu, 28 Feb 2019 14:26:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732957AbfB1O0R (ORCPT ); Thu, 28 Feb 2019 09:26:17 -0500 Received: from mail-qk1-f196.google.com ([209.85.222.196]:47094 "EHLO mail-qk1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732946AbfB1O0Q (ORCPT ); Thu, 28 Feb 2019 09:26:16 -0500 Received: by mail-qk1-f196.google.com with SMTP id i5so12137499qkd.13; Thu, 28 Feb 2019 06:26:14 -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:references:mime-version :content-disposition:in-reply-to:user-agent; bh=LhLBOUVEFdkrOLZyvw0gu9evm3wKITUpm71PjNrrlnI=; b=gHwaeLAG+eCrRH7+FXF3SXn7JybsidgytdVVfbtXfbDj8yP+HFCamy+4RqtVKDkY3F LRO1IY6B8fxq7Exti9/SHGKmHBx+xy7ffdHxnkgNA8w7Th9TEDMPMWa9ObqwL0aAjUMQ GEFvdVQwjRl1YN1oVe6XjQc41sYPS0t8Ft3j7mBVHk+4GHoEu0ZUW4y561aJN1upAD2M paVAJy4eaaDwbVVs7veyurSQUl3ZHsEi6s9jy2JyBfp73ma/Zk2KO3D0zEGRezmjMHIv XN2AdaipZHwLibpJNmLu+qn1rIMImq/pv7UTwgBH3ynrxOYEzcHpei15/XK6RLRoZ6Oh GQSg== 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:references :mime-version:content-disposition:in-reply-to:user-agent; bh=LhLBOUVEFdkrOLZyvw0gu9evm3wKITUpm71PjNrrlnI=; b=liFqd+quh89WeRipZ/dgxT53XAN25GleMisp62TokD4BPjy8HWeVaOjiHONWjYu8Sr jw6rZZJ2g9PkgkooIUJ1FbYlj3Bj3smEHPxnm6l3hHDAcVGWi8PQd8DgdeKGqR2x64lX Mi7CijGQDT04xXjXhCqC40JgrPPZOQ09SjzElIpRaQkLeWdOhPP1qG5RxuVgJDzs9lT/ fkmWCbztobPH7ks6VVPTh8cxp3HYKC2LqOgqDfy9IpzhTvCE61LgWS4g+GUscBGINbdN zS6QKPbehGvdbw6YNYbOdKfKhaM6e06AkFYdup+SGlOXnRgwM47wYv6FJFYStu3mD2Yl 6gTg== X-Gm-Message-State: AHQUAuYnDTryqPINIlOHGtlsFGGKDNnfLlzEPSJIl7kcXRo3viLLvPIk R9QX5G3xOwR5ML1E8FkElEQ= X-Google-Smtp-Source: APXvYqxxr4H4nNGiTsjAG1s9TNWSpDMrW1LiqE/X5fY3fKJCDrW5yWaSMi+bR5oH/zqMClv36v3PZg== X-Received: by 2002:a37:4887:: with SMTP id v129mr6923351qka.100.1551363973946; Thu, 28 Feb 2019 06:26:13 -0800 (PST) Received: from renatolg ([143.107.45.1]) by smtp.gmail.com with ESMTPSA id r44sm12107321qtb.53.2019.02.28.06.26.10 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 28 Feb 2019 06:26:13 -0800 (PST) Date: Thu, 28 Feb 2019 11:26:08 -0300 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, robh+dt@kernel.org, mark.rutland@arm.com Cc: linux-iio@vger.kernel.org, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, kernel-usp@googlegroups.com, devicetree@vger.kernel.org Subject: [PATCH v4 8/9] staging: iio: ad7780: moving ad7780 out of staging Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: 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 v3: - Changes unrelated to moving the driver to main tree were resent as individual patches Changes in v4: - Removed line warning it was safe to build the ad7780 driver by default About the above change in v4, I was unsure whether it was ok to add this in this patch, as 'move out of staging' patches should be just that. But this change is so minimal I'm willing to risk a v5. Bottom line: should I add this change as another patch? drivers/iio/adc/Kconfig | 12 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ad7780.c | 365 +++++++++++++++++++++++++++++++ drivers/staging/iio/adc/Kconfig | 13 -- drivers/staging/iio/adc/Makefile | 1 - drivers/staging/iio/adc/ad7780.c | 365 ------------------------------- 6 files changed, 378 insertions(+), 379 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..6b36a45bd09f 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -108,6 +108,18 @@ 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). + + 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..aa1ddd0c45ee --- /dev/null +++ b/drivers/iio/adc/ad7780.c @@ -0,0 +1,365 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * AD7170/AD7171 and AD7780/AD7781 SPI ADC driver + * + * Copyright 2011 Analog Devices Inc. + * Copyright 2019 Renato Lui Geh + */ + +#include +#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_GAIN BIT(2) + +#define AD7170_ID 0 +#define AD7171_ID 1 +#define AD7780_ID 1 +#define AD7781_ID 0 + +#define AD7780_ID_MASK (BIT(3) | BIT(4)) + +#define AD7780_PATTERN_GOOD 1 +#define AD7780_PATTERN_MASK GENMASK(1, 0) + +#define AD7170_PATTERN_GOOD 5 +#define AD7170_PATTERN_MASK GENMASK(2, 0) + +#define AD7780_GAIN_MIDPOINT 64 +#define AD7780_FILTER_MIDPOINT 13350 + +static const unsigned int ad778x_gain[2] = { 1, 128 }; +static const unsigned int ad778x_odr_avail[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 odr; + 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->odr; + return IIO_VAL_INT; + default: + break; + } + + 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; + unsigned long long vref; + unsigned int full_scale, gain; + + 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->odr = ad778x_odr_avail[val]; + gpiod_set_value(st->filter_gpio, val); + break; + default: + 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->odr = ad778x_odr_avail[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 AD7780_CHANNEL(bits, wordsize) \ + AD_SD_CHANNEL(1, 0, 0, bits, 32, wordsize - bits) +#define AD7170_CHANNEL(bits, wordsize) \ + AD_SD_CHANNEL_NO_SAMP_FREQ(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_GOOD, + .pattern_mask = AD7170_PATTERN_MASK, + .is_ad778x = false, + }, + [ID_AD7171] = { + .channel = AD7170_CHANNEL(16, 24), + .pattern = AD7170_PATTERN_GOOD, + .pattern_mask = AD7170_PATTERN_MASK, + .is_ad778x = false, + }, + [ID_AD7780] = { + .channel = AD7780_CHANNEL(24, 32), + .pattern = AD7780_PATTERN_GOOD, + .pattern_mask = AD7780_PATTERN_MASK, + .is_ad778x = true, + }, + [ID_AD7781] = { + .channel = AD7780_CHANNEL(20, 32), + .pattern = AD7780_PATTERN_GOOD, + .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, + "adi,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, + "adi,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"); + return ret; + } + + 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 aa1ddd0c45ee..000000000000 --- a/drivers/staging/iio/adc/ad7780.c +++ /dev/null @@ -1,365 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * AD7170/AD7171 and AD7780/AD7781 SPI ADC driver - * - * Copyright 2011 Analog Devices Inc. - * Copyright 2019 Renato Lui Geh - */ - -#include -#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_GAIN BIT(2) - -#define AD7170_ID 0 -#define AD7171_ID 1 -#define AD7780_ID 1 -#define AD7781_ID 0 - -#define AD7780_ID_MASK (BIT(3) | BIT(4)) - -#define AD7780_PATTERN_GOOD 1 -#define AD7780_PATTERN_MASK GENMASK(1, 0) - -#define AD7170_PATTERN_GOOD 5 -#define AD7170_PATTERN_MASK GENMASK(2, 0) - -#define AD7780_GAIN_MIDPOINT 64 -#define AD7780_FILTER_MIDPOINT 13350 - -static const unsigned int ad778x_gain[2] = { 1, 128 }; -static const unsigned int ad778x_odr_avail[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 odr; - 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->odr; - return IIO_VAL_INT; - default: - break; - } - - 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; - unsigned long long vref; - unsigned int full_scale, gain; - - 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->odr = ad778x_odr_avail[val]; - gpiod_set_value(st->filter_gpio, val); - break; - default: - 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->odr = ad778x_odr_avail[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 AD7780_CHANNEL(bits, wordsize) \ - AD_SD_CHANNEL(1, 0, 0, bits, 32, wordsize - bits) -#define AD7170_CHANNEL(bits, wordsize) \ - AD_SD_CHANNEL_NO_SAMP_FREQ(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_GOOD, - .pattern_mask = AD7170_PATTERN_MASK, - .is_ad778x = false, - }, - [ID_AD7171] = { - .channel = AD7170_CHANNEL(16, 24), - .pattern = AD7170_PATTERN_GOOD, - .pattern_mask = AD7170_PATTERN_MASK, - .is_ad778x = false, - }, - [ID_AD7780] = { - .channel = AD7780_CHANNEL(24, 32), - .pattern = AD7780_PATTERN_GOOD, - .pattern_mask = AD7780_PATTERN_MASK, - .is_ad778x = true, - }, - [ID_AD7781] = { - .channel = AD7780_CHANNEL(20, 32), - .pattern = AD7780_PATTERN_GOOD, - .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, - "adi,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, - "adi,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"); - return ret; - } - - 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");