From patchwork Thu Oct 5 16:09:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Mikhaylov X-Patchwork-Id: 729782 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1AD79339BE for ; Thu, 5 Oct 2023 16:09:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="gSFb60KO" Received: from mail-lf1-x136.google.com (mail-lf1-x136.google.com [IPv6:2a00:1450:4864:20::136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 72CC0420C; Thu, 5 Oct 2023 09:09:39 -0700 (PDT) Received: by mail-lf1-x136.google.com with SMTP id 2adb3069b0e04-5031ccf004cso1468033e87.2; Thu, 05 Oct 2023 09:09:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1696522177; x=1697126977; 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=WsVvYxQD6LxKCBiD4tkjSZFjifpvp5fSaszqSjpyOaw=; b=gSFb60KO03k0H73PSwUDXr/zWkanqxGTL1hRgrl1WYaPKX1y+6W/YnSVsJ+0nSEBrb mIlEOWtqUxcB+oNxlPW2YFdeJroThkW71dfSkGTT04CH5OgBBuPVnvSniOO7uZAtJDX5 gRutJ/bpWS7+g5dTmaMsO6INW5qV8EJpWKYihsDySTbO8lJYLMdB/ojWzXoqQPBxPJ3H YxQ4SxDCgkU2HRGY/ZNYHat9eiLMNlIBo25zKFGTi/ESONpSTjOTCTpmwwtJoWa9vsn/ JmqeDUBiW+Lbyi/zXob3KOjGcrQUy6Q1rmgvG6569/olziCf3eq3QykkHjuoGpOGtG/7 fq/A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696522177; x=1697126977; 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=WsVvYxQD6LxKCBiD4tkjSZFjifpvp5fSaszqSjpyOaw=; b=dbEjXto16wR/Mx3Xi6i6Oh/h0ZU8Xj0H2k+qB5EQoEvtY8Fg23Ri8pHlkLLEB9var8 FUhjOvxpXZ7Z7PMOtJkOuXl4SiM61WQD4/KBHPIFjMXoGxYYiee1RoKtx7V9LjJtSPN/ Q40X9fUfUUytAMG4LyPw1pFs6F0/YcKsKq+gU4bAHCrHv7RgjL2B2nbs61EzsfPjiiEN MIhutHWCJtKrciB+1zJrTbdQLoxbAXj836A7Cjy9jescsBLcx14fonDGWwaGMtvZ/zze CsO9WIdBZ4Uia681rhO5PtE6hLFTDxa92SqHLapnp5qgnT6m1NaV8FDbI0CC08j1p0qW p+gA== X-Gm-Message-State: AOJu0YxMcM+w/gH48sf3eM0DCxeApzNFtXtQ+oYqOBV04YHZaigNehNv fJHNN9OX6Lt0VjpC8EE66bM= X-Google-Smtp-Source: AGHT+IGH5Uf++CeCbQd29Pqeu6bFvFBUAriES8gAjB+kYlCvPpRJ6EwXsIvxpznl1fHNrlZkgDIkMA== X-Received: by 2002:a19:7b03:0:b0:500:aed0:cb1b with SMTP id w3-20020a197b03000000b00500aed0cb1bmr4799482lfc.24.1696522177346; Thu, 05 Oct 2023 09:09:37 -0700 (PDT) Received: from localhost.localdomain ([46.31.31.132]) by smtp.googlemail.com with ESMTPSA id r16-20020ac24d10000000b00502ae64f46asm349088lfi.126.2023.10.05.09.09.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Oct 2023 09:09:36 -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 v3 1/2] dt-bindings: adc: provide max34408/9 device tree binding document Date: Thu, 5 Oct 2023 19:09:29 +0300 Message-ID: <20231005160930.14665-2-fr0st61te@gmail.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231005160930.14665-1-fr0st61te@gmail.com> References: <20231005160930.14665-1-fr0st61te@gmail.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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_NONE,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 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 + + isshutdown-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 16:09:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Mikhaylov X-Patchwork-Id: 730805 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9C965341B6 for ; Thu, 5 Oct 2023 16:09:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="GVKZkcs/" Received: from mail-lf1-x12f.google.com (mail-lf1-x12f.google.com [IPv6:2a00:1450:4864:20::12f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A659CA5F4; Thu, 5 Oct 2023 09:09:40 -0700 (PDT) Received: by mail-lf1-x12f.google.com with SMTP id 2adb3069b0e04-50307759b65so1519578e87.0; Thu, 05 Oct 2023 09:09:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1696522179; x=1697126979; 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=Cc4RSZ626WDRKPCpEKVKczzWfKxnBKgGhK/Fh1ai47o=; b=GVKZkcs/ogMltsczlgsAv1lBqdP6c/Jh7JlT2wMsbJdD79kxNC6gL8zZaZW6TpmOw4 exJzIx2Qm9ClfuxbZDWl7Kv0nBGWp1YtObEo4FQjnYh6bUlDONw6XDlfWikGopwxwWTH srGQL0jgg6Ff5cLTthX/gY2WHbbDs1p6Q/lwmMuL2Ry3ruVHAeiQylKaabfGfOV7Naum 2LpD5YkoRZUng5pxijmz5i9CCveblB+4kGh+pomZzNveybWRMaAnRhbdb8qc6A2Xud6W IoNzsUGRe2v+anz9k0SWtwfYKhUzvtiZygluzJjkf6SIKLE6SXibOGik2fc7aR05zKPn 7P8g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696522179; x=1697126979; 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=Cc4RSZ626WDRKPCpEKVKczzWfKxnBKgGhK/Fh1ai47o=; b=JPc/+0+NAA0Vc2yKfaMCZrohPQwkQYSIhN05lYW7FpNkxJ2819JZu94Pmz5T+YjREF ZBy4OTz0bktofF2YsV/PqUtxWbB3jGAhPEROXWXxZP10fLBHud5xKV0tRkJCZDdJLBOn g/M6IIBMfelCTisbrVPnDIMC89PNC0F7R2OxF5JS9hxbZ/4hQE0P8CkRVk6cB3f5hzWS EdLWGNHoVhR5Zb1Y6XS3Skl29K2i/lJmMNSPSTWEb118KGn0LiJaVlYoBNCy/KPSdgM7 Vp0wIwmrrrIvd7R9uo5vlGe9PS/g5ruotHNHDysugs/qFcpVVyXG+klFLXUCCjPHTT4/ 9piQ== X-Gm-Message-State: AOJu0Yxou20Cs1uMr5dAdtV1FOkxHrKyh8h+xpYcKxDUSWz913XGAS6V UK9wiQksL/48qqZelql0dgY= X-Google-Smtp-Source: AGHT+IFFY1H9oFxI5+vG0LPRvPqfwWcAlZkhLLn9QOzSGk9kJl+x4A4N9bIfzLtgD36GsAMGE7F1Dw== X-Received: by 2002:a19:6414:0:b0:500:9d6c:913e with SMTP id y20-20020a196414000000b005009d6c913emr4338371lfb.52.1696522178627; Thu, 05 Oct 2023 09:09:38 -0700 (PDT) Received: from localhost.localdomain ([46.31.31.132]) by smtp.googlemail.com with ESMTPSA id r16-20020ac24d10000000b00502ae64f46asm349088lfi.126.2023.10.05.09.09.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Oct 2023 09:09:37 -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 v3 2/2] iio: adc: Add driver support for MAX34408/9 Date: Thu, 5 Oct 2023 19:09:30 +0300 Message-ID: <20231005160930.14665-3-fr0st61te@gmail.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231005160930.14665-1-fr0st61te@gmail.com> References: <20231005160930.14665-1-fr0st61te@gmail.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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_NONE,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 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. 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 | 270 +++++++++++++++++++++++++++++++++++++ 3 files changed, 282 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..f743bf6338dc --- /dev/null +++ b/drivers/iio/adc/max34408.c @@ -0,0 +1,270 @@ +// 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 MAX34408_OCT3_REG 0xA +#define MAX34408_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 device_node *child; + struct iio_dev *indio_dev; + struct regmap *regmap; + int rc, i; + + match = of_match_device(max34408_of_match, dev); + if (!match) + return -EINVAL; + model_data = match->data; + + 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); + + for_each_available_child_of_node(dev->of_node, child) { + of_property_read_u32(child, "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 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");