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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_NEOMUTT autolearn=unavailable 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 58F30C282D7 for ; Tue, 5 Feb 2019 17:14:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1190F20818 for ; Tue, 5 Feb 2019 17:14:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="pWJhCokF" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729598AbfBEROL (ORCPT ); Tue, 5 Feb 2019 12:14:11 -0500 Received: from mail-qt1-f193.google.com ([209.85.160.193]:40920 "EHLO mail-qt1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726196AbfBEROL (ORCPT ); Tue, 5 Feb 2019 12:14:11 -0500 Received: by mail-qt1-f193.google.com with SMTP id j36so2372050qta.7; Tue, 05 Feb 2019 09:14:09 -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=ia29QbbNITWynybJclJYOasTIqeFEm4HhjHF+Ypv31I=; b=pWJhCokF+uqJJHrgP+oMHKXRi9/qezciD+ocOIMP8XEDGIu1nz1i9dV0wNmzUc9bnu XkOBEBCA5dXIMm5ToGzZklUmswGrtp7kt+uirgrhk1riuxZrQ0oQWdron0YLdW2eWRzi FPt/BU/mOouI+2JywhyTe81F4eNyhjueLewP9SHPri8JrcarHBx3+MWIJrErnnsL0Nmx 1ARjAFL8ucVAcZW8TmwuErtoWmKLrlw7d39im54J39AuG1e6RIUlqb4VVNXw65ZoIZXH T7E6MrKQNEh0TpzMLvqv2Q6WexJvrKNI4WwA5gPzx+5obDfiwKt0ESVFndRnKR/b+Xk7 asrA== 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=ia29QbbNITWynybJclJYOasTIqeFEm4HhjHF+Ypv31I=; b=d1svhIx2dsLtd0cqOu/wy3JWbgX4hHaS2IUjdQtw34X4C4ZfE6svI5opOyb3l+i8iQ wk4/hjgWAopeW1B/tuvfX/vIoMxCAImp5PxXxSK6CirxexSDmcwi3nzh2wQSVJl/tQNn M8tIOL6lYSnnLn/fbryA38dXxHB1gQibGOdK/OGZ9AoZY0cFJl3XDaTUjJ+Of9vVF6dD jKj2Uy+WYr4JOsm7fDd1319l0E8ePwMYBlNqsfy1UaVzk4RdoksXQ4y1tTWik3mQYh27 PNmgQKKu7QwZlBq9/yNIVVuioGwAX2yOkVivE8o5ELe7NDRAT7cCvDtMD0Higl6MZcmS i5Xw== X-Gm-Message-State: AHQUAuYxwYni27JnwFC8gUE63xrIzQorILyDBnC/u19dvbadHs1Nx5B1 oCVItIrEg/5b4WZ4dsKUG10= X-Google-Smtp-Source: AHgI3IYKJjE1e0QDCVUIGSUQ4AX6NmA4uG9tIxPSo8us8yMf+YE760UoM1bkJdScSKgfpMouvvNQqQ== X-Received: by 2002:ac8:74d7:: with SMTP id j23mr4565500qtr.369.1549386848775; Tue, 05 Feb 2019 09:14:08 -0800 (PST) Received: from renatolg ([143.107.45.1]) by smtp.gmail.com with ESMTPSA id y32sm18013613qth.3.2019.02.05.09.14.05 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 05 Feb 2019 09:14:08 -0800 (PST) Date: Tue, 5 Feb 2019 15:14:03 -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 v3 4/4] staging: iio: ad7780: moving ad7780 out of staging Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20180716 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 drivers/iio/adc/Kconfig | 13 ++ drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ad7780.c | 359 +++++++++++++++++++++++++++++++ drivers/staging/iio/adc/Kconfig | 13 -- drivers/staging/iio/adc/Makefile | 1 - drivers/staging/iio/adc/ad7780.c | 359 ------------------------------- 6 files changed, 373 insertions(+), 373 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..163e3c983598 --- /dev/null +++ b/drivers/iio/adc/ad7780.c @@ -0,0 +1,359 @@ +// 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_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; + } + + 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; + } + + 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_NO_SAMP_FREQ(1, 0, 0, bits, 32, wordsize - bits) + +static const struct ad7780_chip_info ad7780_chip_info_tbl[] = { + [ID_AD7170] = { + .channel = AD7780_CHANNEL(12, 24), + .pattern = AD7170_PATTERN, + .pattern_mask = AD7170_PATTERN_MASK, + .is_ad778x = false, + }, + [ID_AD7171] = { + .channel = AD7780_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"); + 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 163e3c983598..000000000000 --- a/drivers/staging/iio/adc/ad7780.c +++ /dev/null @@ -1,359 +0,0 @@ -// 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_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; - } - - 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; - } - - 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_NO_SAMP_FREQ(1, 0, 0, bits, 32, wordsize - bits) - -static const struct ad7780_chip_info ad7780_chip_info_tbl[] = { - [ID_AD7170] = { - .channel = AD7780_CHANNEL(12, 24), - .pattern = AD7170_PATTERN, - .pattern_mask = AD7170_PATTERN_MASK, - .is_ad778x = false, - }, - [ID_AD7171] = { - .channel = AD7780_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"); - 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"); -- 2.20.1