Received: by 2002:a25:ad19:0:0:0:0:0 with SMTP id y25csp8573645ybi; Tue, 23 Jul 2019 11:01:23 -0700 (PDT) X-Google-Smtp-Source: APXvYqyNWr5SW3HY3qYy5zD/QDt7xrEwTM+/Vh+yaQQ+pAoqLvgbP1VjfWTcMzg3DbmN7jkfIJz6 X-Received: by 2002:a17:902:da4:: with SMTP id 33mr74808836plv.209.1563904883685; Tue, 23 Jul 2019 11:01:23 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1563904883; cv=none; d=google.com; s=arc-20160816; b=0obFbdtJNjVNxhYuAbBgBNV8DcFWH4O30Qs5GrbaoqH/4iGF0sSr3ipIfgXwFKmEM+ xp6YH7qgrJFpnfMsVVcyAZjskVyRurLrr8gttsNE/TkL79lELcREGs/uoO9h1hgvOyeX h3Wd3bxrkibwsTr8tW+WadcDN+duzAJpXhRib3IPAlMxHR/NHf8BEvxt5E9qB/9dIZ6D Ho0X3stGfTCOgmm5kDi/YHyENRzrukElWfrWoQjpOtVRPY44pySVflPzyiILpMoV7jHN 2OKPzHZAPel/0QWq3hgEZLcr6iyzBuTHRP55yl3WQBuNuf+reIcHafge/n+hiwG+J7Yo rU3g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from; bh=f65RjdV0gGz1N7LtrpfjU+ND/XAIXDWMcXCmuJeAxHE=; b=GUsFNm9qY6mkgquMWdOmlOl+FAOsSs/hSIJZg5irxL7WIBsKfd5eFzCBUbODgojKxZ SBA5ko5gywAjLMjKgudWUxMp4ZxE7fX0w7znAUmQDQt82UQqhpIfqZVgkyyda7pW3rfo VBh30K6bOsfHysc3GUFTGxhEvrng6jvrfbgcUggZlVKfHti5lfJYpdQJSO36X3TLodDn ibgRDrCdMYludpsOnabQoq8n8zZG/jxs5v7kJRapB8ZDPQjGVQ8uiaTNxAAW831CIvxY CYWYq5tGf+gz2CcDhzVx+/kXcq1+sTILDRFRJa8iBRCKlWGfVWDA/9PoOul3seirJDRv PNaA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id 30si491596pgm.346.2019.07.23.11.01.07; Tue, 23 Jul 2019 11:01:23 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387551AbfGWIxx (ORCPT + 99 others); Tue, 23 Jul 2019 04:53:53 -0400 Received: from viti.kaiser.cx ([85.214.81.225]:35420 "EHLO viti.kaiser.cx" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728945AbfGWIxx (ORCPT ); Tue, 23 Jul 2019 04:53:53 -0400 Received: from dslb-094-223-146-077.094.223.pools.vodafone-ip.de ([94.223.146.77] helo=martin-debian-1.paytec.ch) by viti.kaiser.cx with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.89) (envelope-from ) id 1hpqYM-00012z-9x; Tue, 23 Jul 2019 10:53:46 +0200 From: Martin Kaiser To: Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , Rob Herring Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Martin Kaiser Subject: [PATCH v2] iio: potentiometer: add a driver for Maxim 5432-5435 Date: Tue, 23 Jul 2019 10:53:24 +0200 Message-Id: <20190723085324.11318-1-martin@kaiser.cx> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190721175915.27192-1-martin@kaiser.cx> References: <20190721175915.27192-1-martin@kaiser.cx> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a driver for the Maxim Integrated MAX5432-MAX5435 family of digital potentiometers. These potentiometers are connected via I2C and have 32 wiper positions. Supported functionality - set the volatile wiper position - read the potentiometer scale Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX5432-MAX5435.pdf Signed-off-by: Martin Kaiser --- changes in v2 - use MAX5432_ prefix for all defines - fix indentation - convert void * to unsigned long, not to u32 (warning from kbuild test robot) .../bindings/iio/potentiometer/max5432.txt | 21 ++++ drivers/iio/potentiometer/Kconfig | 11 ++ drivers/iio/potentiometer/Makefile | 1 + drivers/iio/potentiometer/max5432.c | 135 +++++++++++++++++++++ 4 files changed, 168 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/potentiometer/max5432.txt create mode 100644 drivers/iio/potentiometer/max5432.c diff --git a/Documentation/devicetree/bindings/iio/potentiometer/max5432.txt b/Documentation/devicetree/bindings/iio/potentiometer/max5432.txt new file mode 100644 index 000000000000..6c6ce85e4c85 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/potentiometer/max5432.txt @@ -0,0 +1,21 @@ +* Maxim Integrated MAX5432-MAX5435 Digital Potentiometers. + +The node for this driver must be a child node of an I2C controller, hence +all mandatory properties for your controller must be specified. See directory: + + Documentation/devicetree/bindings/i2c + +for more details. + +Required properties: +- compatible: Must be one of the following, depending on the model: + "maxim,max5432" + "maxim,max5433" + "maxim,max5434" + "maxim,max5435" + +Example: +max5434@28 { + compatible = "maxim,max5434"; + reg = <0x28>; +}; diff --git a/drivers/iio/potentiometer/Kconfig b/drivers/iio/potentiometer/Kconfig index ebc7c72a5e36..4cac0173db8b 100644 --- a/drivers/iio/potentiometer/Kconfig +++ b/drivers/iio/potentiometer/Kconfig @@ -26,6 +26,17 @@ config DS1803 To compile this driver as a module, choose M here: the module will be called ds1803. +config MAX5432 + tristate "Maxim MAX5432-MAX5435 Digital Potentiometer driver" + depends on I2C + help + Say yes here to build support for the Maxim + MAX5432, MAX5433, MAX5434 and MAX5435 digital + potentiometer chips. + + To compile this driver as a module, choose M here: the + module will be called max5432. + config MAX5481 tristate "Maxim MAX5481-MAX5484 Digital Potentiometer driver" depends on SPI diff --git a/drivers/iio/potentiometer/Makefile b/drivers/iio/potentiometer/Makefile index 8ff55138cf12..091adf3cdd0b 100644 --- a/drivers/iio/potentiometer/Makefile +++ b/drivers/iio/potentiometer/Makefile @@ -6,6 +6,7 @@ # When adding new entries keep the list in alphabetical order obj-$(CONFIG_AD5272) += ad5272.o obj-$(CONFIG_DS1803) += ds1803.o +obj-$(CONFIG_MAX5432) += max5432.o obj-$(CONFIG_MAX5481) += max5481.o obj-$(CONFIG_MAX5487) += max5487.o obj-$(CONFIG_MCP4018) += mcp4018.o diff --git a/drivers/iio/potentiometer/max5432.c b/drivers/iio/potentiometer/max5432.c new file mode 100644 index 000000000000..95251e7c0c34 --- /dev/null +++ b/drivers/iio/potentiometer/max5432.c @@ -0,0 +1,135 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Maxim Integrated MAX5432-MAX5435 digital potentiometer driver + * Copyright (C) 2019 Martin Kaiser + * + * Datasheet: + * https://datasheets.maximintegrated.com/en/ds/MAX5432-MAX5435.pdf + */ + +#include +#include +#include +#include +#include +#include + +/* All chip variants have 32 wiper positions. */ +#define MAX5432_MAX_POS 31 + +#define MAX5432_OHM_50K (50 * 1000) +#define MAX5432_OHM_100K (100 * 1000) + +/* Update the volatile (currently active) setting. */ +#define MAX5432_CMD_VREG 0x11 + +struct max5432_data { + struct i2c_client *client; + unsigned long ohm; +}; + +static const struct iio_chan_spec max5432_channels[] = { + { + .type = IIO_RESISTANCE, + .indexed = 1, + .output = 1, + .channel = 0, + .address = MAX5432_CMD_VREG, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), + } +}; + +static int max5432_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct max5432_data *data = iio_priv(indio_dev); + + if (mask != IIO_CHAN_INFO_SCALE) + return -EINVAL; + + if (unlikely(data->ohm > INT_MAX)) + return -ERANGE; + + *val = data->ohm; + *val2 = MAX5432_MAX_POS; + + return IIO_VAL_FRACTIONAL; +} + +static int max5432_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct max5432_data *data = iio_priv(indio_dev); + u8 data_byte; + + if (mask != IIO_CHAN_INFO_RAW) + return -EINVAL; + + if (val < 0 || val > MAX5432_MAX_POS) + return -EINVAL; + + if (val2 != 0) + return -EINVAL; + + /* Wiper position is in bits D7-D3. (D2-D0 are don't care bits.) */ + data_byte = val << 3; + return i2c_smbus_write_byte_data( + data->client, chan->address, data_byte); +} + +static const struct iio_info max5432_info = { + .read_raw = max5432_read_raw, + .write_raw = max5432_write_raw, +}; + +static int max5432_probe( + struct i2c_client *client, const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct iio_dev *indio_dev; + struct max5432_data *data; + + indio_dev = devm_iio_device_alloc(dev, sizeof(struct max5432_data)); + if (!indio_dev) + return -ENOMEM; + + i2c_set_clientdata(client, indio_dev); + + data = iio_priv(indio_dev); + data->client = client; + data->ohm = (unsigned long)of_device_get_match_data(dev); + + indio_dev->dev.parent = dev; + indio_dev->info = &max5432_info; + indio_dev->channels = max5432_channels; + indio_dev->num_channels = ARRAY_SIZE(max5432_channels); + indio_dev->name = client->name; + + return devm_iio_device_register(dev, indio_dev); +} + +static const struct of_device_id max5432_dt_ids[] = { + { .compatible = "maxim,max5432", .data = (void *)MAX5432_OHM_50K }, + { .compatible = "maxim,max5433", .data = (void *)MAX5432_OHM_100K }, + { .compatible = "maxim,max5434", .data = (void *)MAX5432_OHM_50K }, + { .compatible = "maxim,max5435", .data = (void *)MAX5432_OHM_100K }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, max5432_dt_ids); + +static struct i2c_driver max5432_driver = { + .driver = { + .name = "max5432", + .of_match_table = of_match_ptr(max5432_dt_ids), + }, + .probe = max5432_probe, +}; + +module_i2c_driver(max5432_driver); + +MODULE_AUTHOR("Martin Kaiser "); +MODULE_DESCRIPTION("max5432-max5435 digital potentiometers"); +MODULE_LICENSE("GPL v2"); -- 2.11.0