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[2620:137:e000::3:4]) by mx.google.com with ESMTPS id k7-20020a170902c40700b001bb0ff2b354si7376375plk.425.2023.09.17.17.51.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 17 Sep 2023 17:51:02 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:4 as permitted sender) client-ip=2620:137:e000::3:4; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=PsNnpMnS; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:4 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 howler.vger.email (Postfix) with ESMTP id 1F835827A0B4; Sun, 17 Sep 2023 14:12:57 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at howler.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238963AbjIQVMO (ORCPT + 28 others); Sun, 17 Sep 2023 17:12:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32966 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239032AbjIQVMA (ORCPT ); Sun, 17 Sep 2023 17:12:00 -0400 Received: from mail-lj1-x229.google.com (mail-lj1-x229.google.com [IPv6:2a00:1450:4864:20::229]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8AD0712B; Sun, 17 Sep 2023 14:11:54 -0700 (PDT) Received: by mail-lj1-x229.google.com with SMTP id 38308e7fff4ca-2b962c226ceso63382161fa.3; Sun, 17 Sep 2023 14:11:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1694985112; x=1695589912; 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=HSVdBe6r93QrgKS3he21TKM8q8THmRfH47H2f/qi7rs=; b=PsNnpMnS3g8oPR55wnZHHExVPpz6jjMODbwO7CzxG+pgoRBIqdNVj8Bu9zl/UZIxdG dDUefQm+e7XU3xwfOz4amUs2oHTStqUCVEknZytwqPJ/sr10VLJeDZzpQyibGmTM2kWL 2pDxrSbhR0lQlzVT8ztZTUWY1mymU6vIQBZys/ukk6nofPe4zg5OKdIx4JOkA+u69n+d eBvOeV+0vEyu83EhViJ3BnlFpltkYI9/5H8/bdsd8eLaq7wJxZwnNbPwNpK38nZojkqD wGOq5N2q0ZxoR1jpCvMc7e0AofHtPU2RvfIUEh1LUMbwEXYqMq0UAt1Ou2WJpQzW4tay OHxA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694985112; x=1695589912; 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=HSVdBe6r93QrgKS3he21TKM8q8THmRfH47H2f/qi7rs=; b=vSlmQKZHxfcmQVb/lUIF9sjeAPy/koP8y+4jhJ/XBLmMIU1QAsoxg37Mjz40qlpEyO z7nJlfWkybtaC1BOw4BOFQEOIFsCwB2z0xTmstmKvC0oIykH2AwOSdYg7/yUxHGIF9Wp 94sXAnOJb7oo1Yf0skA0gzo0iwsLIiP9sb7y61b4s8ABwhqYDIzR5gdMhHD9+Cgi8ozV caTfS2cBoOg70kPxzS8qVhkrm/9m5cVfY1IBRGvfRIR9eNN4jkSEixvJsheahNpQYzaT S6/Xdi6+IfnLFYhiQHDUkaHLN+jJOcpv7QefEXv4QhXyqMBUQmyYh6AzEKhtOeYV2pxA U/UA== X-Gm-Message-State: AOJu0Yw7HmURuXsiCgAuAm0CvdyAHDIt3qDXgMJwBNy6r8oyW4p9NN6C nCVTJ+RdFeARRNcknv5dyB4= X-Received: by 2002:a2e:9656:0:b0:2be:4d40:f833 with SMTP id z22-20020a2e9656000000b002be4d40f833mr6406063ljh.18.1694985112315; Sun, 17 Sep 2023 14:11:52 -0700 (PDT) Received: from fr.lan ([46.31.31.48]) by smtp.googlemail.com with ESMTPSA id p15-20020a2e740f000000b002bce3123639sm1766309ljc.98.2023.09.17.14.11.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 17 Sep 2023 14:11:51 -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 1/2] dt-bindings: adc: provide max34408/9 device tree binding document Date: Mon, 18 Sep 2023 00:11:42 +0300 Message-ID: <20230917211143.7094-2-fr0st61te@gmail.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230917211143.7094-1-fr0st61te@gmail.com> References: <20230917211143.7094-1-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 (howler.vger.email [0.0.0.0]); Sun, 17 Sep 2023 14:12:57 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777334497539744250 X-GMAIL-MSGID: 1777334497539744250 The i2c driver with Rsense option for current monitoring. Signed-off-by: Ivan Mikhaylov Reviewed-by: Rob Herring --- .../bindings/iio/adc/maxim,max34408.yaml | 63 +++++++++++++++++++ 1 file changed, 63 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..ae7c6ddb13d8 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/maxim,max34408.yaml @@ -0,0 +1,63 @@ +# 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 + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + maxim,rsense-val-micro-ohms: + description: + Adjust the Rsense value to monitor higher or lower current levels. + enum: [250, 500, 1000, 5000, 10000, 50000, 100000, 200000, 500000] + default: 1000 + +required: + - compatible + - reg + - maxim,rsense-val-micro-ohms + +additionalProperties: false + +examples: + - | + i2c { + + #address-cells = <1>; + #size-cells = <0>; + + adc@1e { + compatible = "maxim,max34409"; + reg = <0x1e>; + maxim,rsense-val-micro-ohms = <1000>; + }; + }; From patchwork Sun Sep 17 21:11:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Mikhaylov X-Patchwork-Id: 141216 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:612c:172:b0:3f2:4152:657d with SMTP id h50csp2347193vqi; Sun, 17 Sep 2023 16:42:50 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEGHOR4n4qD+gHIe3cY/HtugjmQVKsQfxRspRTYxEGkhxZMueYVKIxpmafrwuRblCVgoBV5 X-Received: by 2002:a05:6808:a9c:b0:3a7:4a89:752c with SMTP id q28-20020a0568080a9c00b003a74a89752cmr8725780oij.31.1694994169960; Sun, 17 Sep 2023 16:42:49 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1694994169; cv=none; d=google.com; s=arc-20160816; b=m3BnHH/T4AIs7Ho+hjFbUxWPvxrsGFccFvRf7coEI4JY/9WuhJj1XELS+78ORxnJy6 IXppbJD8/cAm4FKaLHFsOwiu2N646a4FDy3O+z1XWpIQDb8QZvfLOFBzN3AAIOl9+lKo wMqgPFnWtkdhe17R3F7i6/YpmpvSVZgbaMy0aY251CS/1N5lyvZMnwBHkTZO7VgFpw8k 7YT3qgVPfy/rXfqGuOu7Dyo7WCLF4NTMWKZDZO0ut4279pX993WJK8x+eXEcthqHvp7K sLlucBUvGZgWdCS3DLLYFAwHtD0+Z1j9bW+W9VbRCuR+UGvEfDrO1MrI4bRIvZLOsP53 8nFA== 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=HR0dF66Xzv3ASXk+JgLCo3Ex4ZJDHC7199qzFfOVypU=; fh=gXdKdTzXVpCzUn5wRwZJ/NCMvVwA1kGKWl4i6uq6pzM=; b=1G98/ADadT4N75hnlgBm0I0LiH/5SBknzh4J/jb2hY9+LZi5lWUa/C3Ue6tw+JOYwF lG2N3i1A2cXWhQsMXFBqgy/ffK0QI9/HrgkUbKGs0YCwpG9QFy8ihAsFl4rf7pFtW8Ze M0skuaDHvjJwpyTs7Zd52zpObNkGGYh7tyYO9qT5Lb53/46cJE/5bGtjm1REgx84u9+b JueNySYPFmYqQmzf6XMDvnrFdZmb9WWmCmrKYbVmjWWf1pJL6JNnTFZIIeqUKIsgjlq+ R5KnKwDWe35lKliWa/DglSlNvU0QsN8g6UVk0RFWy0IuvdspU+4rDq/FWTUn6U3wXEtV TlSw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=VWo2BSUm; 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 | 334 +++++++++++++++++++++++++++++++++++++ 3 files changed, 346 insertions(+) create mode 100644 drivers/iio/adc/max34408.c diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 517b3db114b8..538b086ed593 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -756,6 +756,17 @@ config MAX9611 To compile this driver as a module, choose M here: the module will be called max9611. +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 MCP320X tristate "Microchip Technology MCP3x01/02/04/08 and MCP3550/1/3" depends on SPI diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index 2facf979327d..8fee08546bcc 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -69,6 +69,7 @@ obj-$(CONFIG_MAX1241) += max1241.o obj-$(CONFIG_MAX1363) += max1363.o obj-$(CONFIG_MAX77541_ADC) += max77541-adc.o obj-$(CONFIG_MAX9611) += max9611.o +obj-$(CONFIG_MAX34408) += max34408.o obj-$(CONFIG_MCP320X) += mcp320x.o obj-$(CONFIG_MCP3422) += mcp3422.o obj-$(CONFIG_MCP3911) += mcp3911.o diff --git a/drivers/iio/adc/max34408.c b/drivers/iio/adc/max34408.c new file mode 100644 index 000000000000..96c1de59edb5 --- /dev/null +++ b/drivers/iio/adc/max34408.c @@ -0,0 +1,334 @@ +// 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 + +#define MAX34408_STATUS 0x0 +#define MAX34408_CONTROL 0x1 +#define MAX34408_OCDELAY 0x2 +#define MAX34408_SDDELAY 0x3 + +#define MAX34408_ADC1 0x4 +#define MAX34408_ADC2 0x5 +/* ADC3 & ADC4 always returns 0x0 on 34408 */ +#define MAX34408_ADC3 0x6 +#define MAX34408_ADC4 0x7 + +#define MAX34408_OCT1 0x8 +#define MAX34408_OCT2 0x9 +#define MAX34408_OCT3 0xA +#define MAX34408_OCT4 0xB + +#define MAX34408_DID 0xC +#define MAX34408_DCYY 0xD +#define MAX34408_DCWW 0xE + +#define MAX34408_CHANNELS 2 +#define MAX34409_CHANNELS 4 + +/* Bit masks for status register */ +#define STATUS_OC1 BIT(0) +#define STATUS_OC2 BIT(1) +/* OC3 & OC4 only for max34409 */ +#define STATUS_OC3 BIT(2) +#define STATUS_OC4 BIT(3) +#define STATUS_SHTDN BIT(4) +#define STATUS_ENA BIT(5) + +/* Bit masks for control register */ +#define CONTROL_AVG0 BIT(0) +#define CONTROL_AVG1 BIT(1) +#define CONTROL_AVG2 BIT(2) +#define CONTROL_ALERT BIT(3) + +/* Bit masks for over current delay */ +#define OCDELAY_OCD0 BIT(0) +#define OCDELAY_OCD1 BIT(1) +#define OCDELAY_OCD2 BIT(2) +#define OCDELAY_OCD3 BIT(3) +#define OCDELAY_OCD4 BIT(4) +#define OCDELAY_OCD5 BIT(5) +#define OCDELAY_OCD6 BIT(6) +#define OCDELAY_RESET BIT(7) + +/* Bit masks for shutdown delay */ +#define SDDELAY_SHD0 BIT(0) +#define SDDELAY_SHD1 BIT(1) +#define SDDELAY_SHD2 BIT(2) +#define SDDELAY_SHD3 BIT(3) +#define SDDELAY_SHD4 BIT(4) +#define SDDELAY_SHD5 BIT(5) +#define SDDELAY_SHD6 BIT(6) +#define SDDELAY_RESET BIT(7) + +/** + * struct max34408_data - max34408/max34409 specific data. + * @regmap: device register map. + * @dev: max34408 device. + * @lock: lock for protecting access to device hardware registers. + * @rsense: Rsense value in uOhm. + */ +struct max34408_data { + struct regmap *regmap; + struct device *dev; + struct mutex lock; + u32 rsense; +}; + +static const struct regmap_config max34408_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = MAX34408_DCWW, +}; + +static const struct iio_chan_spec max34408_channels[] = { + { + .type = IIO_CURRENT, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_PROCESSED) | + BIT(IIO_CHAN_INFO_AVERAGE_RAW), + .channel = 0, + .indexed = 1, + }, + { + .type = IIO_CURRENT, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_PROCESSED) | + BIT(IIO_CHAN_INFO_AVERAGE_RAW), + .channel = 1, + .indexed = 1, + }, +}; + +static const struct iio_chan_spec max34409_channels[] = { + { + .type = IIO_CURRENT, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_PROCESSED) | + BIT(IIO_CHAN_INFO_AVERAGE_RAW), + .channel = 0, + .indexed = 1, + }, + { + .type = IIO_CURRENT, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_PROCESSED) | + BIT(IIO_CHAN_INFO_AVERAGE_RAW), + .channel = 1, + .indexed = 1, + }, + { + .type = IIO_CURRENT, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_PROCESSED) | + BIT(IIO_CHAN_INFO_AVERAGE_RAW), + .channel = 2, + .indexed = 1, + }, + { + .type = IIO_CURRENT, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_PROCESSED) | + BIT(IIO_CHAN_INFO_AVERAGE_RAW), + .channel = 3, + .indexed = 1, + }, +}; + +static int max34408_read_adc(struct max34408_data *max34408, int channel, + int *val) +{ + int rc; + u32 adc_reg; + + switch (channel) { + case 0: + adc_reg = MAX34408_ADC1; + break; + case 1: + adc_reg = MAX34408_ADC2; + break; + case 2: + adc_reg = MAX34408_ADC3; + break; + case 3: + adc_reg = MAX34408_ADC4; + break; + default: + return -EINVAL; + } + + rc = regmap_read(max34408->regmap, adc_reg, val); + if (rc) + return rc; + + return 0; +} + +static int max34408_read_adc_avg(struct max34408_data *max34408, int channel, int *val) +{ + unsigned long ctrl; + int rc; + u8 tmp; + + mutex_lock(&max34408->lock); + rc = regmap_read(max34408->regmap, MAX34408_CONTROL, (u32 *)&ctrl); + if (rc) + goto err_unlock; + + /* set averaging (0b100) default values*/ + tmp = ctrl; + set_bit(CONTROL_AVG2, &ctrl); + clear_bit(CONTROL_AVG1, &ctrl); + clear_bit(CONTROL_AVG0, &ctrl); + rc = regmap_write(max34408->regmap, MAX34408_CONTROL, ctrl); + if (rc) { + dev_err(max34408->dev, + "Error (%d) writing control register\n", rc); + goto err_unlock; + } + + rc = max34408_read_adc(max34408, channel, val); + if (rc) + goto err_unlock; + + /* back to old values */ + rc = regmap_write(max34408->regmap, MAX34408_CONTROL, tmp); + if (rc) + dev_err(max34408->dev, + "Error (%d) writing control register\n", rc); + +err_unlock: + mutex_unlock(&max34408->lock); + + 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_PROCESSED: + case IIO_CHAN_INFO_AVERAGE_RAW: + rc = max34408_read_adc_avg(max34408, chan->channel, + val); + if (rc) + return rc; + + if (mask == IIO_CHAN_INFO_PROCESSED) { + /* + * 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 = DIV_ROUND_CLOSEST((10000 / max34408->rsense) * + *val * 1000, 256); + } + + return IIO_VAL_INT; + case IIO_CHAN_INFO_RAW: + rc = max34408_read_adc(max34408, chan->channel, val); + if (rc) + return rc; + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static const struct iio_info max34408_info = { + .read_raw = max34408_read_raw, +}; + +static int max34408_probe(struct i2c_client *client) +{ + struct device_node *np = client->dev.of_node; + struct max34408_data *max34408; + struct iio_dev *indio_dev; + struct regmap *regmap; + int rc; + + regmap = devm_regmap_init_i2c(client, &max34408_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&client->dev, "regmap_init failed\n"); + return PTR_ERR(regmap); + } + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*max34408)); + if (!indio_dev) + return -ENOMEM; + + max34408 = iio_priv(indio_dev); + i2c_set_clientdata(client, indio_dev); + max34408->regmap = regmap; + max34408->dev = &client->dev; + mutex_init(&max34408->lock); + rc = device_property_read_u32(&client->dev, + "maxim,rsense-val-micro-ohms", + &max34408->rsense); + if (rc) + return -EINVAL; + + /* disable ALERT and averaging */ + rc = regmap_write(max34408->regmap, MAX34408_CONTROL, 0x0); + if (rc) + return rc; + + if (of_device_is_compatible(np, "maxim,max34408")) { + indio_dev->channels = max34408_channels; + indio_dev->num_channels = ARRAY_SIZE(max34408_channels); + indio_dev->name = "max34408"; + } else if (of_device_is_compatible(np, "maxim,max34409")) { + indio_dev->channels = max34409_channels; + indio_dev->num_channels = ARRAY_SIZE(max34409_channels); + indio_dev->name = "max34409"; + } + indio_dev->info = &max34408_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->dev.of_node = np; + + return devm_iio_device_register(&client->dev, indio_dev); +} + +static const struct of_device_id max34408_of_match[] = { + { + .compatible = "maxim,max34408", + }, + { + .compatible = "maxim,max34409", + }, + {} +}; +MODULE_DEVICE_TABLE(of, max34408_of_match); + +static struct i2c_driver max34408_driver = { + .driver = { + .name = "max34408", + .of_match_table = max34408_of_match, + }, + .probe = max34408_probe, +}; +module_i2c_driver(max34408_driver); + +MODULE_AUTHOR("Ivan Mikhaylov "); +MODULE_DESCRIPTION("Maxim MAX34408/34409 ADC driver"); +MODULE_LICENSE("GPL");