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[2620:137:e000::3:7]) by mx.google.com with ESMTPS id p4-20020a17090ab90400b002744e9b7a22si4096376pjr.9.2023.10.05.11.57.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Oct 2023 11:57:37 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:7 as permitted sender) client-ip=2620:137:e000::3:7; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=fVBUtrrR; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:7 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by snail.vger.email (Postfix) with ESMTP id 0A6958092D9A; Thu, 5 Oct 2023 11:56:12 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at snail.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231654AbjJES4A (ORCPT + 18 others); Thu, 5 Oct 2023 14:56:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39398 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229656AbjJESz4 (ORCPT ); Thu, 5 Oct 2023 14:55:56 -0400 Received: from mail-lf1-x135.google.com (mail-lf1-x135.google.com [IPv6:2a00:1450:4864:20::135]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 039179B; Thu, 5 Oct 2023 11:55:55 -0700 (PDT) Received: by mail-lf1-x135.google.com with SMTP id 2adb3069b0e04-50435ad51bbso1686912e87.2; Thu, 05 Oct 2023 11:55:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1696532153; x=1697136953; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=W67NqH9c8zeb7HC14GCOy1jZno6eL79OOZCnPnFozWo=; b=fVBUtrrRZBDcLMpfLbzaCIXwp4cRr5ROZot8HY0BNDjOtPO+m9o+wEui233bsZf/Ww F4u0DWvmERwiGs2dWya8vSB71dXxWlBfDXy/PfLqDTMt9hiHRQQvx9dz82Y1+Em+KTsi r1cKJCKjMqmRbsbqyLp2tyKIirkFXua3Rd2BKTT/Is9T+FEvukkuExf/5c3x1La7e/ST uNBDJ1/qt9TdTau88SJiLVW1JOkA0E3+6BcD4V2s1h8HoXfs525oyS+Xd/bfGaoXXgof 95jqiOPiX2h0SJRSaa2Hr5PHU39iRjAycwDc/jmFD21o2jGhHI3CtjHHF5uaN2TF+1hi Hvxg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696532153; x=1697136953; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=W67NqH9c8zeb7HC14GCOy1jZno6eL79OOZCnPnFozWo=; b=IbMD/wi605mV9BAqtP5+0h1/14dbs7zIZxuTRC5MO8rxn2Bl8GAmzI8fjFzuHc5zbK MWdKCunCToejmxY9NC9hpyFNznYPkuNzIaSKG/HnwQ6kBOs8dZ49oA/aXINc5oDv87Ax +h/BLVCDW9ZaGKssBE5K5l3MSdiQQZzD/waDd2SzckRhkltLy+KRbJWe7S9v181GdiRi klgl2epkutdgLMk08o92lYvZlORg2lsSa7ysuwErX2COryUXhfm51/AxbOyW/8tbynlU p4CDIcFi4B3nBFBO+BOkGrd/JgtEcJJfyRUvTvmlK+g9LyfCOk/cnKTwRB07psWaLMGt aqew== X-Gm-Message-State: AOJu0YzuCoR8UV6IC9wWh0xxvvVpgdHVWJE1Xrwg/P8J0WgWB7FTrnRo /ZCyS+7ifrONmGUnrxbz4qyJMNmm9eWX0tf+ X-Received: by 2002:a05:6512:2396:b0:500:8fcd:c3b5 with SMTP id c22-20020a056512239600b005008fcdc3b5mr7314730lfv.12.1696532153008; Thu, 05 Oct 2023 11:55:53 -0700 (PDT) Received: from fr.lan ([46.31.31.132]) by smtp.googlemail.com with ESMTPSA id q1-20020ac246e1000000b004fe48d0b639sm402341lfo.83.2023.10.05.11.55.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Oct 2023 11:55:52 -0700 (PDT) From: Ivan Mikhaylov To: Jonathan Cameron , Lars-Peter Clausen , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Ivan Mikhaylov Subject: [PATCH v4 1/2] dt-bindings: adc: provide max34408/9 device tree binding document Date: Thu, 5 Oct 2023 21:55:36 +0300 Message-ID: <20231005185537.32267-2-fr0st61te@gmail.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231005185537.32267-1-fr0st61te@gmail.com> References: <20231005185537.32267-1-fr0st61te@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Thu, 05 Oct 2023 11:56:12 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1778943007779833119 X-GMAIL-MSGID: 1778943007779833119 The hardware binding for i2c current monitoring device with overcurrent control. Signed-off-by: Ivan Mikhaylov --- .../bindings/iio/adc/maxim,max34408.yaml | 137 ++++++++++++++++++ 1 file changed, 137 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/adc/maxim,max34408.yaml diff --git a/Documentation/devicetree/bindings/iio/adc/maxim,max34408.yaml b/Documentation/devicetree/bindings/iio/adc/maxim,max34408.yaml new file mode 100644 index 000000000000..4262bedb4bfa --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/maxim,max34408.yaml @@ -0,0 +1,137 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/adc/maxim,max34408.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Two- and four-channel current monitors with overcurrent control + +maintainers: + - Ivan Mikhaylov + +description: | + The MAX34408/MAX34409 are two- and four-channel current monitors that are + configured and monitored with a standard I2C/SMBus serial interface. Each + unidirectional current sensor offers precision high-side operation with a + low full-scale sense voltage. The devices automatically sequence through + two or four channels and collect the current-sense samples and average them + to reduce the effect of impulse noise. The raw ADC samples are compared to + user-programmable digital thresholds to indicate overcurrent conditions. + Overcurrent conditions trigger a hardware output to provide an immediate + indication to shut down any necessary external circuitry. + + Specifications about the devices can be found at: + https://www.analog.com/media/en/technical-documentation/data-sheets/MAX34408-MAX34409.pdf + +properties: + compatible: + enum: + - maxim,max34408 + - maxim,max34409 + + "#address-cells": + const: 1 + + "#size-cells": + const: 0 + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + shutdown-gpios: + description: + Shutdown Output. Open-drain output. This output transitions to high impedance + when any of the digital comparator thresholds are exceeded as long as the ENA + pin is high. + maxItems: 1 + + shtdn-enable-gpios: + description: + SHTDN Enable Input. CMOS digital input. Connect to GND to clear the latch and + unconditionally deassert (force low) the SHTDN output and reset the shutdown + delay. Connect to VDD to enable normal latch operation of the SHTDN output. + maxItems: 1 + + vdd-supply: true + +required: + - compatible + - reg + +patternProperties: + "^channel@[0-3]$": + $ref: adc.yaml + type: object + description: + Represents the internal channels of the ADC. + + properties: + reg: + items: + minimum: 0 + maximum: 3 + + maxim,rsense-val-micro-ohms: + description: + Adjust the Rsense value to monitor higher or lower current levels for + input. + enum: [250, 500, 1000, 5000, 10000, 50000, 100000, 200000, 500000] + default: 1000 + + required: + - reg + - maxim,rsense-val-micro-ohms + + unevaluatedProperties: false + +allOf: + - if: + properties: + compatible: + contains: + const: maxim,max34408 + then: + patternProperties: + "^channel@[2-3]$": false + "^channel@[0-1]$": + properties: + reg: + minimum: 0 + maximum: 1 + else: + patternProperties: + "^channel@[0-3]$": + properties: + reg: + minimum: 0 + maximum: 3 + +additionalProperties: false + +examples: + - | + i2c { + + #address-cells = <1>; + #size-cells = <0>; + + adc@1e { + compatible = "maxim,max34409"; + reg = <0x1e>; + + #address-cells = <1>; + #size-cells = <0>; + channel@0 { + reg = <0x0>; + maxim,rsense-val-micro-ohms = <5000>; + }; + + channel@1 { + reg = <0x1>; + maxim,rsense-val-micro-ohms = <10000>; + }; + }; + }; From patchwork Thu Oct 5 18:55:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Mikhaylov X-Patchwork-Id: 148987 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:612c:2016:b0:403:3b70:6f57 with SMTP id fe22csp502296vqb; Thu, 5 Oct 2023 11:56:32 -0700 (PDT) X-Google-Smtp-Source: AGHT+IH24eUv13X3hZvoiAW763joj8vjLocqEJ3N/sH9zCKzAI4SZHeBuCJjRBct90+f3qeo1WRk X-Received: by 2002:a17:902:c60a:b0:1c5:cd1c:46fa with SMTP id r10-20020a170902c60a00b001c5cd1c46famr5449406plr.36.1696532192144; Thu, 05 Oct 2023 11:56:32 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1696532192; cv=none; d=google.com; s=arc-20160816; b=UeZEUU4dr18QIpe83BmiYwdJb5V7NrRH1aCEU/GdothdSBhWPVVJPMGsa3btYJN4WR xWVqVGkcjGREgPZxfFFekFB/liSrtxA3m62btgjFmxjGsVs6FhFi7313yj+tIN6GVONJ 3h/QwkN2prwazvnMALe71HbMegIwSXISlvao0QEYQkrv8cYywKerzzjPBKSpbs8fOxeK Ddf7wVjo/fZj1zYYHa1vBgC8anaiqYGbUD8JVf/SFsi8xcKVcIQ1TnzDjT8pYSlm9IbX Q6k/keFIVAfjsvXFy9pe8z4gf0W/VlHGOZV0mTovM6NQpUDTFs6a2T5c1okaFC6ZLDMZ w+Xg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=X2LX0rOH4ptg6iToWhFnGDkQs1T8mG/o/1vt3Vpaz2Q=; fh=gXdKdTzXVpCzUn5wRwZJ/NCMvVwA1kGKWl4i6uq6pzM=; b=CU4XULQXxBd8Ow0/7vrNCD30Zu1FFta2vKSwl8J2LVpdz+0/9LVtACiGnZUzaTf+e8 Sz1je9AqV9GkQfpUvgxujmf+8MAgICmidJj7/bb2jNuqRFOnZcyZt/Ty/7INFnbAj35p sE3zw+hHOYlmFFWNvtZLeFSvffWuO6c3pSVddEyQXqQCmKRQBsULkXaHiTsgAygCsFHx eJmS4xQGC6e2fOh+PKwNiBETv3SxmORtzZaK2AkNb1hoxf8C4WNF3x2NLy0yfKI/Uaxc CrIfqaNkGwQizPVRl/1J7VbgEciY5kFhkJ4hVxW8TAHtMNXCqAKmVvQQfRngT6kedUCw OItg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=Q+15D+Nd; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.34 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from howler.vger.email (howler.vger.email. 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Each unidirectional current sensor offers precision high-side operation with a low full-scale sense voltage. The devices automatically sequence through two or four channels and collect the current-sense samples and average them to reduce the effect of impulse noise. The raw ADC samples are compared to user-programmable digital thresholds to indicate overcurrent conditions. Overcurrent conditions trigger a hardware output to provide an immediate indication to shut down any necessary external circuitry. Add as ADC driver which only supports current monitoring for now. Link: https://www.analog.com/media/en/technical-documentation/data-sheets/MAX34408-MAX34409.pdf Signed-off-by: Ivan Mikhaylov --- drivers/iio/adc/Kconfig | 11 ++ drivers/iio/adc/Makefile | 1 + drivers/iio/adc/max34408.c | 278 +++++++++++++++++++++++++++++++++++++ 3 files changed, 290 insertions(+) create mode 100644 drivers/iio/adc/max34408.c diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 517b3db114b8..c215a2861350 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -735,6 +735,17 @@ config MAX1363 To compile this driver as a module, choose M here: the module will be called max1363. +config MAX34408 + tristate "Maxim max34408/max344089 ADC driver" + depends on I2C + help + Say yes here to build support for Maxim max34408/max34409 current sense + monitor with 8-bits ADC interface with overcurrent delay/threshold and + shutdown delay. + + To compile this driver as a module, choose M here: the module will be + called max34408. + config MAX77541_ADC tristate "Analog Devices MAX77541 ADC driver" depends on MFD_MAX77541 diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index 2facf979327d..46dceab85e9a 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -67,6 +67,7 @@ obj-$(CONFIG_MAX11205) += max11205.o obj-$(CONFIG_MAX11410) += max11410.o obj-$(CONFIG_MAX1241) += max1241.o obj-$(CONFIG_MAX1363) += max1363.o +obj-$(CONFIG_MAX34408) += max34408.o obj-$(CONFIG_MAX77541_ADC) += max77541-adc.o obj-$(CONFIG_MAX9611) += max9611.o obj-$(CONFIG_MCP320X) += mcp320x.o diff --git a/drivers/iio/adc/max34408.c b/drivers/iio/adc/max34408.c new file mode 100644 index 000000000000..85cd7b1ec186 --- /dev/null +++ b/drivers/iio/adc/max34408.c @@ -0,0 +1,278 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * IIO driver for Maxim MAX34409/34408 ADC, 4-Channels/2-Channels, 8bits, I2C + * + * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/MAX34408-MAX34409.pdf + * + * TODO: ALERT interrupt, Overcurrent delay, Shutdown delay + */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#define MAX34408_STATUS_REG 0x0 +#define MAX34408_CONTROL_REG 0x1 +#define MAX34408_OCDELAY_REG 0x2 +#define MAX34408_SDDELAY_REG 0x3 + +#define MAX34408_ADC1_REG 0x4 +#define MAX34408_ADC2_REG 0x5 +/* ADC3 & ADC4 always returns 0x0 on 34408 */ +#define MAX34409_ADC3_REG 0x6 +#define MAX34409_ADC4_REG 0x7 + +#define MAX34408_OCT1_REG 0x8 +#define MAX34408_OCT2_REG 0x9 +#define MAX34409_OCT3_REG 0xA +#define MAX34409_OCT4_REG 0xB + +#define MAX34408_DID_REG 0xC +#define MAX34408_DCYY_REG 0xD +#define MAX34408_DCWW_REG 0xE + +/* Bit masks for status register */ +#define MAX34408_STATUS_OC_MSK GENMASK(1, 0) +#define MAX34409_STATUS_OC_MSK GENMASK(3, 0) +#define MAX34408_STATUS_SHTDN BIT(4) +#define MAX34408_STATUS_ENA BIT(5) + +/* Bit masks for control register */ +#define MAX34408_CONTROL_AVG0 BIT(0) +#define MAX34408_CONTROL_AVG1 BIT(1) +#define MAX34408_CONTROL_AVG2 BIT(2) +#define MAX34408_CONTROL_ALERT BIT(3) + +#define MAX34408_DEFAULT_AVG 0x4 + +/* Bit masks for over current delay */ +#define MAX34408_OCDELAY_OCD_MSK GENMASK(6, 0) +#define MAX34408_OCDELAY_RESET BIT(7) + +/* Bit masks for shutdown delay */ +#define MAX34408_SDDELAY_SHD_MSK GENMASK(6, 0) +#define MAX34408_SDDELAY_RESET BIT(7) + +#define MAX34408_DEFAULT_RSENSE 1000 + +/** + * struct max34408_data - max34408/max34409 specific data. + * @regmap: device register map. + * @dev: max34408 device. + * @lock: lock for protecting access to device hardware registers, mostly + * for read modify write cycles for control registers. + * @input_rsense: Rsense values in uOhm, will be overwritten by + * values from channel nodes. + */ +struct max34408_data { + struct regmap *regmap; + struct device *dev; + struct mutex lock; + u32 input_rsense[4]; +}; + +static const struct regmap_config max34408_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = MAX34408_DCWW_REG, +}; + +struct max34408_adc_model_data { + const char *model_name; + const struct iio_chan_spec *channels; + const int num_channels; +}; + +#define MAX34008_CHANNEL(_index, _address) \ + { \ + .type = IIO_CURRENT, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_OFFSET), \ + .channel = (_index), \ + .address = (_address), \ + .indexed = 1, \ + } + +static const struct iio_chan_spec max34408_channels[] = { + MAX34008_CHANNEL(0, MAX34408_ADC1_REG), + MAX34008_CHANNEL(1, MAX34408_ADC2_REG), +}; + +static const struct iio_chan_spec max34409_channels[] = { + MAX34008_CHANNEL(0, MAX34408_ADC1_REG), + MAX34008_CHANNEL(1, MAX34408_ADC2_REG), + MAX34008_CHANNEL(2, MAX34409_ADC3_REG), + MAX34008_CHANNEL(3, MAX34409_ADC4_REG), +}; + +static int max34408_read_adc_avg(struct max34408_data *max34408, + const struct iio_chan_spec *chan, int *val) +{ + unsigned int ctrl; + int rc; + + guard(mutex)(&max34408->lock); + rc = regmap_read(max34408->regmap, MAX34408_CONTROL_REG, (u32 *)&ctrl); + if (rc) + return rc; + + /* set averaging (0b100) default values*/ + rc = regmap_write(max34408->regmap, MAX34408_CONTROL_REG, + MAX34408_DEFAULT_AVG); + if (rc) { + dev_err(max34408->dev, + "Error (%d) writing control register\n", rc); + return rc; + } + + rc = regmap_read(max34408->regmap, chan->address, val); + if (rc) + return rc; + + /* back to old values */ + rc = regmap_write(max34408->regmap, MAX34408_CONTROL_REG, ctrl); + if (rc) + dev_err(max34408->dev, + "Error (%d) writing control register\n", rc); + + return rc; +} + +static int max34408_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct max34408_data *max34408 = iio_priv(indio_dev); + int rc; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + rc = max34408_read_adc_avg(max34408, chan, val); + if (rc) + return rc; + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + /* + * calcluate current for 8bit ADC with Rsense + * value. + * 10 mV * 1000 / Rsense uOhm = max current + * (max current * adc val * 1000) / (2^8 - 1) mA + */ + *val = 10000 / max34408->input_rsense[chan->channel]; + *val2 = 8; + return IIO_VAL_FRACTIONAL_LOG2; + default: + return -EINVAL; + } +} + +static const struct iio_info max34408_info = { + .read_raw = max34408_read_raw, +}; + +static const struct max34408_adc_model_data max34408_model_data = { + .model_name = "max34408", + .channels = max34408_channels, + .num_channels = 2, +}; + +static const struct max34408_adc_model_data max34409_model_data = { + .model_name = "max34409", + .channels = max34409_channels, + .num_channels = 4, +}; + +static const struct of_device_id max34408_of_match[] = { + { + .compatible = "maxim,max34408", + .data = &max34408_model_data, + }, + { + .compatible = "maxim,max34409", + .data = &max34409_model_data, + }, + {} +}; +MODULE_DEVICE_TABLE(of, max34408_of_match); + +static int max34408_probe(struct i2c_client *client) +{ + const struct max34408_adc_model_data *model_data; + struct device *dev = &client->dev; + const struct of_device_id *match; + struct max34408_data *max34408; + struct fwnode_handle *node; + struct iio_dev *indio_dev; + struct regmap *regmap; + int rc, i; + + match = i2c_of_match_device(max34408_of_match, client); + if (!match) + return -EINVAL; + model_data = i2c_get_match_data(client); + + regmap = devm_regmap_init_i2c(client, &max34408_regmap_config); + if (IS_ERR(regmap)) { + dev_err_probe(dev, PTR_ERR(regmap), + "regmap_init failed\n"); + return PTR_ERR(regmap); + } + + indio_dev = devm_iio_device_alloc(dev, sizeof(*max34408)); + if (!indio_dev) + return -ENOMEM; + + max34408 = iio_priv(indio_dev); + max34408->regmap = regmap; + max34408->dev = dev; + mutex_init(&max34408->lock); + + device_for_each_child_node(dev, node) { + fwnode_property_read_u32(node, "maxim,rsense-val-micro-ohms", + &max34408->input_rsense[i]); + i++; + } + + /* disable ALERT and averaging */ + rc = regmap_write(max34408->regmap, MAX34408_CONTROL_REG, 0x0); + if (rc) + return rc; + + indio_dev->channels = model_data->channels; + indio_dev->num_channels = model_data->num_channels; + indio_dev->name = model_data->model_name; + + indio_dev->info = &max34408_info; + indio_dev->modes = INDIO_DIRECT_MODE; + + return devm_iio_device_register(dev, indio_dev); +} + +static const struct i2c_device_id max34408_id[] = { + { "max34408", (kernel_ulong_t)&max34408_model_data }, + { "max34409", (kernel_ulong_t)&max34409_model_data }, + {} +}; +MODULE_DEVICE_TABLE(i2c, max34408_id); + +static struct i2c_driver max34408_driver = { + .driver = { + .name = "max34408", + .of_match_table = max34408_of_match, + }, + .probe = max34408_probe, + .id_table = max34408_id, +}; +module_i2c_driver(max34408_driver); + +MODULE_AUTHOR("Ivan Mikhaylov "); +MODULE_DESCRIPTION("Maxim MAX34408/34409 ADC driver"); +MODULE_LICENSE("GPL");