From patchwork Sat Aug 14 17:55:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mugilraj Dhavachelvan X-Patchwork-Id: 12436775 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,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 97A70C4338F for ; Sat, 14 Aug 2021 17:57:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7494960F42 for ; Sat, 14 Aug 2021 17:57:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231137AbhHNR53 (ORCPT ); Sat, 14 Aug 2021 13:57:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37772 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238916AbhHNR5M (ORCPT ); Sat, 14 Aug 2021 13:57:12 -0400 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 57AB7C0613CF; Sat, 14 Aug 2021 10:56:44 -0700 (PDT) Received: by mail-pj1-x1033.google.com with SMTP id bo18so20227563pjb.0; Sat, 14 Aug 2021 10:56:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=IPj6ILOpZZ50aP1T2Ut52iloC7VUEnx1pfAKnDIgyys=; b=ZCLYlcIFXK0ix9ufR6HHuPVlgU5MyUKBAjw78tybsWhiqIbHTvlwKfUGUaIcb+ibD/ D8e4tFCXxeWwTkeIfBlj7Sz6F6pvyE6pDRrAghnPyYtqri3CnckN0z4EFxBQHNnlMhIS 5KMb/+IuuK4w/Nl5YQgKgH4nykW0uBDTr0kKpNkC83kXRAtdYPu+xHyTAyTAVFKdaGKQ 2/zDIOALP8STp4xx1lXhf0THTkmFSM96UUwxwW/IbFmaJFm5GF9qCGwU+LA+hrzhJUSz 5XcgLmNDsWZyMqbtvegiPoSNuLB+5LON+w6lL1zooKilpEo8QrWuRHhoO5HKErdNwVt+ 8D4Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=IPj6ILOpZZ50aP1T2Ut52iloC7VUEnx1pfAKnDIgyys=; b=MGf1u2vnFECDKzyM5GExifYx8iDpKzqTwJqqRrl+EzLbiGGvW+mpiXCH4yk8HNgg/U X+IysbvLWRVsjDKKwAAyn5QWfDH4k9zA2LnDGMMsor1lg1+NwgM5zdB3KqzZ2W9P2VSp 170ahkZHFkoR6DZnYIjuOYSU14gTSy0wKsYNv3s8omB4LSd22LmsLJFPI9DCB14kETag wflecmFKvliZgbHyoXiUMUhqZfmB5J28kP8lF53IY7DPRWOMVMcYtaB7TZxXb4FZvO3p fbYye2DMcncspAocFepXEmWw5p3enGrVKU9aui6HAJCXP3xLW1YMbywAjbhHa8P9okIZ l5Rg== X-Gm-Message-State: AOAM532TSx+iuufsllfB+GEyk+ASKjarGBsbJWGt6nU3+V4TIlkCLX6f NjMEdCUiAkONKRvJYECI7kY= X-Google-Smtp-Source: ABdhPJzbf1psfm9bgbVTkGLHwGSfB844UNQJD+0LyJnlIaztqDFklpYLXrDrbUp7qpkRmuXIOYd13Q== X-Received: by 2002:a17:90b:f83:: with SMTP id ft3mr8287632pjb.173.1628963803854; Sat, 14 Aug 2021 10:56:43 -0700 (PDT) Received: from localhost.localdomain ([2409:4072:6293:2348:f0eb:567b:5544:c735]) by smtp.googlemail.com with ESMTPSA id q26sm6305380pff.174.2021.08.14.10.56.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Aug 2021 10:56:43 -0700 (PDT) From: Mugilraj Dhavachelvan To: Dragos.Bogdan@analog.com, Darius.Berghe@analog.com, Rob Herring , Jonathan Cameron , Lars-Peter Clausen , Michael Hennerich , Mugilraj Dhavachelvan , Guenter Roeck , Chris Packham , Krzysztof Kozlowski , Alexandre Belloni , Alexandru Ardelean , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org Cc: Rob Herring Subject: [PATCH v3 1/2] dt-bindings: iio: potentiometer: Add AD5110 in trivial-devices Date: Sat, 14 Aug 2021 23:25:39 +0530 Message-Id: <20210814175607.48399-2-dmugil2000@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210814175607.48399-1-dmugil2000@gmail.com> References: <20210814175607.48399-1-dmugil2000@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Add AD5110, a Nonvolatile Digital Potentiometer into trivial-devices.yaml. Acked-by: Rob Herring Signed-off-by: Mugilraj Dhavachelvan --- Documentation/devicetree/bindings/trivial-devices.yaml | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml index 8341e9d23c1e..55c8a6ce5057 100644 --- a/Documentation/devicetree/bindings/trivial-devices.yaml +++ b/Documentation/devicetree/bindings/trivial-devices.yaml @@ -33,6 +33,8 @@ properties: - ad,ad7414 # ADM9240: Complete System Hardware Monitor for uProcessor-Based Systems - ad,adm9240 + # AD5110 - Nonvolatile Digital Potentiometer + - adi,ad5110 # Analog Devices ADP5585 Keypad Decoder and I/O Expansion - adi,adp5585 # Analog Devices ADP5585 Keypad Decoder and I/O Expansion with support for Row5 From patchwork Sat Aug 14 17:55:40 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Mugilraj Dhavachelvan X-Patchwork-Id: 12436777 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 5FA14C432BE for ; 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Sat, 14 Aug 2021 10:56:55 -0700 (PDT) Received: from localhost.localdomain ([2409:4072:6293:2348:f0eb:567b:5544:c735]) by smtp.googlemail.com with ESMTPSA id q26sm6305380pff.174.2021.08.14.10.56.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Aug 2021 10:56:55 -0700 (PDT) From: Mugilraj Dhavachelvan To: Dragos.Bogdan@analog.com, Darius.Berghe@analog.com, Rob Herring , Jonathan Cameron , Lars-Peter Clausen , Mugilraj Dhavachelvan , Michael Hennerich , Guenter Roeck , Chris Packham , Jarkko Sakkinen , Krzysztof Kozlowski , Alexandre Belloni , Alexandru Ardelean , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org Subject: [PATCH v3 2/2] iio: potentiometer: Add driver support for AD5110 Date: Sat, 14 Aug 2021 23:25:40 +0530 Message-Id: <20210814175607.48399-3-dmugil2000@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210814175607.48399-1-dmugil2000@gmail.com> References: <20210814175607.48399-1-dmugil2000@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org The AD5110/AD5112/AD5114 provide a nonvolatile solution for 128-/64-/32-position adjustment applications, offering guaranteed low resistor tolerance errors of ±8% and up to ±6 mA current density. Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD5110_5112_5114.pdf Signed-off-by: Mugilraj Dhavachelvan Reviewed-by: Andy Shevchenko --- MAINTAINERS | 6 + drivers/iio/potentiometer/Kconfig | 10 + drivers/iio/potentiometer/Makefile | 1 + drivers/iio/potentiometer/ad5110.c | 345 +++++++++++++++++++++++++++++ 4 files changed, 362 insertions(+) create mode 100644 drivers/iio/potentiometer/ad5110.c diff --git a/MAINTAINERS b/MAINTAINERS index bd7aff0c120f..cf6e73b87b6e 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -452,6 +452,12 @@ S: Maintained W: https://parisc.wiki.kernel.org/index.php/AD1889 F: sound/pci/ad1889.* +AD5110 ANALOG DEVICES DIGITAL POTENTIOMETERS DRIVER +M: Mugilraj Dhavachelvan +L: linux-iio@vger.kernel.org +S: Supported +F: drivers/iio/potentiometer/ad5110.c + AD525X ANALOG DEVICES DIGITAL POTENTIOMETERS DRIVER M: Michael Hennerich S: Supported diff --git a/drivers/iio/potentiometer/Kconfig b/drivers/iio/potentiometer/Kconfig index 4cac0173db8b..832df8da2bc6 100644 --- a/drivers/iio/potentiometer/Kconfig +++ b/drivers/iio/potentiometer/Kconfig @@ -6,6 +6,16 @@ menu "Digital potentiometers" +config AD5110 + tristate "Analog Devices AD5110 and similar Digital Potentiometer driver" + depends on I2C + help + Say yes here to build support for the Analog Devices AD5110, AD5112 + and AD5114 digital potentiometer chip. + + To compile this driver as a module, choose M here: the + module will be called ad5110. + config AD5272 tristate "Analog Devices AD5272 and similar Digital Potentiometer driver" depends on I2C diff --git a/drivers/iio/potentiometer/Makefile b/drivers/iio/potentiometer/Makefile index 091adf3cdd0b..5ebb8e3bbd76 100644 --- a/drivers/iio/potentiometer/Makefile +++ b/drivers/iio/potentiometer/Makefile @@ -4,6 +4,7 @@ # # When adding new entries keep the list in alphabetical order +obj-$(CONFIG_AD5110) += ad5110.o obj-$(CONFIG_AD5272) += ad5272.o obj-$(CONFIG_DS1803) += ds1803.o obj-$(CONFIG_MAX5432) += max5432.o diff --git a/drivers/iio/potentiometer/ad5110.c b/drivers/iio/potentiometer/ad5110.c new file mode 100644 index 000000000000..ae18f9e115b2 --- /dev/null +++ b/drivers/iio/potentiometer/ad5110.c @@ -0,0 +1,345 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Analog Devices AD5110 digital potentiometer driver + * + * Copyright (C) 2021 Mugilraj Dhavachelvan + * + * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD5110_5112_5114.pdf + */ + +#include +#include +#include +#include +#include + +#include +#include + +/* AD5110 commands */ +#define AD5110_EEPROM_WR 1 +#define AD5110_RDAC_WR 2 +#define AD5110_SHUTDOWN 3 +#define AD5110_RESET 4 +#define AD5110_RDAC_RD 5 +#define AD5110_EEPROM_RD 6 + +/* AD5110_EEPROM_RD data */ +#define AD5110_WIPER_POS 0 +#define AD5110_RESISTOR_TOL 1 + +#define AD5110_WIPER_RESISTANCE 70 + +struct ad5110_cfg { + int max_pos; + int kohms; + int shift; +}; + +enum ad5110_type { + AD5110_10, + AD5110_80, + AD5112_05, + AD5112_10, + AD5112_80, + AD5114_10, + AD5114_80, +}; + +static const struct ad5110_cfg ad5110_cfg[] = { + [AD5110_10] = { .max_pos = 128, .kohms = 10 }, + [AD5110_80] = { .max_pos = 128, .kohms = 80 }, + [AD5112_05] = { .max_pos = 64, .kohms = 5, .shift = 1 }, + [AD5112_10] = { .max_pos = 64, .kohms = 10, .shift = 1 }, + [AD5112_80] = { .max_pos = 64, .kohms = 80, .shift = 1 }, + [AD5114_10] = { .max_pos = 32, .kohms = 10, .shift = 2 }, + [AD5114_80] = { .max_pos = 32, .kohms = 80, .shift = 2 }, +}; + +struct ad5110_data { + struct i2c_client *client; + s16 tol; /* resistor tolerance */ + bool enable; + struct mutex lock; + const struct ad5110_cfg *cfg; + /* + * DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + */ + u8 buf[2] ____cacheline_aligned; +}; + +static const struct iio_chan_spec ad5110_channels[] = { + { + .type = IIO_RESISTANCE, + .output = 1, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_OFFSET) | + BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_ENABLE), + }, +}; + +static int ad5110_read(struct ad5110_data *data, u8 cmd, int *val) +{ + int ret; + + mutex_lock(&data->lock); + data->buf[0] = cmd; + data->buf[1] = *val; + + ret = i2c_master_send_dmasafe(data->client, data->buf, sizeof(data->buf)); + if (ret < 0) { + goto error; + } else if (ret != sizeof(data->buf)) { + ret = -EIO; + goto error; + } + + ret = i2c_master_recv_dmasafe(data->client, data->buf, 1); + if (ret < 0) { + goto error; + } else if (ret != 1) { + ret = -EIO; + goto error; + } + + *val = data->buf[0]; + ret = 0; + +error: + mutex_unlock(&data->lock); + return ret; +} + +static int ad5110_write(struct ad5110_data *data, u8 cmd, u8 val) +{ + int ret; + + mutex_lock(&data->lock); + data->buf[0] = cmd; + data->buf[1] = val; + + ret = i2c_master_send_dmasafe(data->client, data->buf, sizeof(data->buf)); + if (ret < 0) { + goto error; + } else if (ret != sizeof(data->buf)) { + ret = -EIO; + goto error; + } + + ret = 0; + +error: + mutex_unlock(&data->lock); + return ret; +} + +static int ad5110_resistor_tol(struct ad5110_data *data, u8 cmd, int val) +{ + int ret; + + ret = ad5110_read(data, cmd, &val); + if (ret) + return ret; + + data->tol = data->cfg->kohms * (val & GENMASK(6, 0)) * 10 / 8; + if (!(val & BIT(7))) + data->tol *= -1; + + return 0; +} + +static ssize_t store_eeprom_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct ad5110_data *data = iio_priv(indio_dev); + int val = AD5110_WIPER_POS; + int ret; + + ret = ad5110_read(data, AD5110_EEPROM_RD, &val); + if (ret) + return ret; + + val = val >> data->cfg->shift; + return iio_format_value(buf, IIO_VAL_INT, 1, &val); +} + +static ssize_t store_eeprom_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct ad5110_data *data = iio_priv(indio_dev); + int ret; + + ret = ad5110_write(data, AD5110_EEPROM_WR, 0); + if (ret) { + dev_err(&data->client->dev, "RDAC to EEPROM write failed\n"); + return ret; + } + + /* The storing of EEPROM data takes approximately 18 ms. */ + msleep(20); + + return len; +} + +static IIO_DEVICE_ATTR_RW(store_eeprom, 0); + +static struct attribute *ad5110_attributes[] = { + &iio_dev_attr_store_eeprom.dev_attr.attr, + NULL +}; + +static const struct attribute_group ad5110_attribute_group = { + .attrs = ad5110_attributes, +}; + +static int ad5110_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct ad5110_data *data = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = ad5110_read(data, AD5110_RDAC_RD, val); + if (ret) + return ret; + + *val = *val >> data->cfg->shift; + return IIO_VAL_INT; + case IIO_CHAN_INFO_OFFSET: + *val = AD5110_WIPER_RESISTANCE * data->cfg->max_pos; + *val2 = 1000 * data->cfg->kohms + data->tol; + return IIO_VAL_FRACTIONAL; + case IIO_CHAN_INFO_SCALE: + *val = 1000 * data->cfg->kohms + data->tol; + *val2 = data->cfg->max_pos; + return IIO_VAL_FRACTIONAL; + case IIO_CHAN_INFO_ENABLE: + *val = data->enable; + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static int ad5110_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct ad5110_data *data = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + if (val > data->cfg->max_pos || val < 0) + return -EINVAL; + + return ad5110_write(data, AD5110_RDAC_WR, val << data->cfg->shift); + case IIO_CHAN_INFO_ENABLE: + if (val < 0 || val > 1) + return -EINVAL; + if (data->enable == val) + return 0; + ret = ad5110_write(data, AD5110_SHUTDOWN, val ? 0 : 1); + if (ret) + return ret; + data->enable = val; + return 0; + default: + return -EINVAL; + } +} + +static const struct iio_info ad5110_info = { + .read_raw = ad5110_read_raw, + .write_raw = ad5110_write_raw, + .attrs = &ad5110_attribute_group, +}; + +#define AD5110_COMPATIBLE(of_compatible, cfg) { \ + .compatible = of_compatible, \ + .data = &ad5110_cfg[cfg], \ +} + +static const struct of_device_id ad5110_of_match[] = { + AD5110_COMPATIBLE("adi,ad5110-10", AD5110_10), + AD5110_COMPATIBLE("adi,ad5110-80", AD5110_80), + AD5110_COMPATIBLE("adi,ad5112-05", AD5112_05), + AD5110_COMPATIBLE("adi,ad5112-10", AD5112_10), + AD5110_COMPATIBLE("adi,ad5112-80", AD5112_80), + AD5110_COMPATIBLE("adi,ad5114-10", AD5114_10), + AD5110_COMPATIBLE("adi,ad5114-80", AD5114_80), + { } +}; +MODULE_DEVICE_TABLE(of, ad5110_of_match); + +static const struct i2c_device_id ad5110_id[] = { + { "ad5110-10", AD5110_10 }, + { "ad5110-80", AD5110_80 }, + { "ad5112-05", AD5112_05 }, + { "ad5112-10", AD5112_10 }, + { "ad5112-80", AD5112_80 }, + { "ad5114-10", AD5114_10 }, + { "ad5114-80", AD5114_80 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ad5110_id); + +static int ad5110_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct iio_dev *indio_dev; + struct ad5110_data *data; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + data->client = client; + mutex_init(&data->lock); + data->enable = 1; + data->cfg = device_get_match_data(dev); + + /* refresh RDAC register with EEPROM */ + ret = ad5110_write(data, AD5110_RESET, 0); + if (ret) { + dev_err(dev, "Refresh RDAC with EEPROM failed\n"); + return ret; + } + + ret = ad5110_resistor_tol(data, AD5110_EEPROM_RD, AD5110_RESISTOR_TOL); + if (ret) { + dev_err(dev, "Read resistor tolerance failed\n"); + return ret; + } + + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->info = &ad5110_info; + indio_dev->channels = ad5110_channels; + indio_dev->num_channels = ARRAY_SIZE(ad5110_channels); + indio_dev->name = client->name; + + return devm_iio_device_register(dev, indio_dev); +} + +static struct i2c_driver ad5110_driver = { + .driver = { + .name = "ad5110", + .of_match_table = ad5110_of_match, + }, + .probe_new = ad5110_probe, + .id_table = ad5110_id, +}; +module_i2c_driver(ad5110_driver); + +MODULE_AUTHOR("Mugilraj Dhavachelvan "); +MODULE_DESCRIPTION("AD5110 digital potentiometer"); +MODULE_LICENSE("GPL v2"); +