From patchwork Fri Sep 29 20:08:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Mikhaylov X-Patchwork-Id: 13404789 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD5CDE728EE for ; Fri, 29 Sep 2023 20:08:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233464AbjI2UIx (ORCPT ); Fri, 29 Sep 2023 16:08:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43550 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233442AbjI2UIw (ORCPT ); Fri, 29 Sep 2023 16:08:52 -0400 Received: from mail-lf1-x12d.google.com (mail-lf1-x12d.google.com [IPv6:2a00:1450:4864:20::12d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C71FD1B6; Fri, 29 Sep 2023 13:08:50 -0700 (PDT) Received: by mail-lf1-x12d.google.com with SMTP id 2adb3069b0e04-50305abe5f0so22435402e87.2; Fri, 29 Sep 2023 13:08:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1696018129; x=1696622929; 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=VN1081SHvTpVYN+hwqlWDocjpX1nTwlxlaQPrJNJTKs=; b=Fzjjbe3L73zL9Ibg4FztWUs0QwAUIIYiskDiuBR6ePKsHdNJsgefm7QtTB5ZE9CTJc CJvN6x22CggnCSgJWFfsmiZJNrqE92qDwlpsY62QVLeS0iFfpKbkVHeJBDYPPxMtrwIq wTMczLy8I1mJGxAc0UxQLVlJufr0h9E9eVA+3IvZTU46mCq17SNoScsVL2/4vk1mPL8q M9xAVonkommaM/vx5K6/Cbyxo1svX/5IRSuyJxO6cfVNonI7bIIexjEfqHPelumfn9uj ZJUCwqe7MzxdLGGOEEN9D89UuwVnCmmtBHVNXE8EcpzaYS5IzHbKkW9kxJRatGf8g1n/ lPEA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696018129; x=1696622929; 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=VN1081SHvTpVYN+hwqlWDocjpX1nTwlxlaQPrJNJTKs=; b=P6dKILrY38q8fc3eIKeBZKfSWpM8SXO7AsHKPMYakbS6S+u20W/ffWebHlt1Ca4Lq+ P6szjDiQ5H9UDH4Lf1ymkvk1oGN12aUdW8BLVJJ6Pu3Jz4WvPO1OB70xyMupYq+8l3V7 ewbEu4rd/1ZTJMr7jYGs6j8B5vS588H0m3ysxUHLEZ1goRIoaLZ9cZZS3gUGMrBFhPUt 83ZYJxNVJ1oVBzWs59K64nIlF2F/ym9h/4mjb21ii38VtTbZRrFNK7Bnc1Mof3J8VmdH irjXvNOen59Yi43+yQncR+Q1rzNv+kAcotZn5jrcepvrblwbo+Hq4xX9qGMtqEQ1NCEc 3IkQ== X-Gm-Message-State: AOJu0YwluTlUE2wgac4tT3rJ+k+1BElMjNy9QDjIWOlMP1zhWuukYfOJ JNYC1AM48rOCgfVgkpjxs6akVm6xQ907+g== X-Google-Smtp-Source: AGHT+IG0ANWUhDzZWyxdAcwunCQzBWAvJfaQNqJw06J5i96aWysl4EA+lhYv9Im3DC/nqgG6UoNpmw== X-Received: by 2002:ac2:4daa:0:b0:503:9eb:d277 with SMTP id h10-20020ac24daa000000b0050309ebd277mr3645838lfe.49.1696018128757; Fri, 29 Sep 2023 13:08:48 -0700 (PDT) Received: from fr.lan ([46.31.31.132]) by smtp.googlemail.com with ESMTPSA id v12-20020a19740c000000b005056e9b734esm422439lfe.151.2023.09.29.13.08.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Sep 2023 13:08:48 -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 v2 1/2] dt-bindings: adc: provide max34408/9 device tree binding document Date: Fri, 29 Sep 2023 23:08:43 +0300 Message-ID: <20230929200844.23316-2-fr0st61te@gmail.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230929200844.23316-1-fr0st61te@gmail.com> References: <20230929200844.23316-1-fr0st61te@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org The hardware binding for i2c current monitoring device with overcurrent control. Signed-off-by: Ivan Mikhaylov --- .../bindings/iio/adc/maxim,max34408.yaml | 101 ++++++++++++++++++ 1 file changed, 101 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..cdf89fa4c80e --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/maxim,max34408.yaml @@ -0,0 +1,101 @@ +# 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,input1-rsense-val-micro-ohms: + description: + Adjust the Rsense value to monitor higher or lower current levels for + input 1. + enum: [250, 500, 1000, 5000, 10000, 50000, 100000, 200000, 500000] + default: 1000 + + maxim,input2-rsense-val-micro-ohms: + description: + Adjust the Rsense value to monitor higher or lower current levels for + input 2. + enum: [250, 500, 1000, 5000, 10000, 50000, 100000, 200000, 500000] + default: 1000 + + maxim,input3-rsense-val-micro-ohms: + description: + Adjust the Rsense value to monitor higher or lower current levels for + input 3. + enum: [250, 500, 1000, 5000, 10000, 50000, 100000, 200000, 500000] + default: 1000 + + maxim,input4-rsense-val-micro-ohms: + description: + Adjust the Rsense value to monitor higher or lower current levels for + input 4. + enum: [250, 500, 1000, 5000, 10000, 50000, 100000, 200000, 500000] + default: 1000 + + maxim,shtdn: + 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. + type: boolean + + maxim,ena: + 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. + type: boolean + + supply-vdd: true + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + i2c { + + #address-cells = <1>; + #size-cells = <0>; + + adc@1e { + compatible = "maxim,max34409"; + reg = <0x1e>; + maxim,input1-rsense-val-micro-ohms = <5000>; + maxim,input2-rsense-val-micro-ohms = <10000>; + }; + }; From patchwork Fri Sep 29 20:08:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Mikhaylov X-Patchwork-Id: 13404790 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E0CBCE728EF for ; Fri, 29 Sep 2023 20:08:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233481AbjI2UIz (ORCPT ); Fri, 29 Sep 2023 16:08:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43592 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233069AbjI2UIy (ORCPT ); Fri, 29 Sep 2023 16:08:54 -0400 Received: from mail-lf1-x12b.google.com (mail-lf1-x12b.google.com [IPv6:2a00:1450:4864:20::12b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8E4ACDE; Fri, 29 Sep 2023 13:08:51 -0700 (PDT) Received: by mail-lf1-x12b.google.com with SMTP id 2adb3069b0e04-50307acd445so22428912e87.0; Fri, 29 Sep 2023 13:08:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1696018130; x=1696622930; 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=RC51NPRQArVOguHDhk9mg73V7ayqVja4w0iQeM4AXP8=; b=MYIVJmmXRVsZZYYKyHGv1YRu3jpCmetPpaaX9VwNEXYg1Lo70V6kD7knCID/YUeTqH DU77xXc9+sII2/V9HvR0+FVa8rOghFqLATlzwJpxNfEZNZByu8UvgiiC2T/s0FCsfJsY Zrc0rZjW5Pgcu2ySP3OX/ioA82vA357gxW9T34qr3SdS6tRhf4mrtqwounTd2EcgMxj1 YhbjCjnGKWAsfQv7T8kgl3OBxfyjKzTlxtQmN7LxNxEHGhoAye7Q9Ub+H+VyoRcbT95h uCfjMnHsETHSBqTEt/aYcoCm4i0dEFniNzCxkO+gEpenrLfT8VPgpL7MzF0TRgPcgngL +ilA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696018130; x=1696622930; 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=RC51NPRQArVOguHDhk9mg73V7ayqVja4w0iQeM4AXP8=; b=CTOAxi4/KHriLYZcCahR1AS84LDFF2ix2qCbn+0xk448ko1Rdfzx5Cdhc1gGZRfR3x CLT+OIROQpJnAR7E7j9RtYtNkAHwtnBRZjDA9mOFrO1AwMEQVxdlt6fXWS49LYEKYKZf 5QHwEWaA+KPgVkkul3b0HyyZlQKytaeAwUsQ9XOcYsd7Ybx1olI1bHQbbF/fFw1f205E AC4xGj2PIIQhN3p9fEiLaN2rBdyIXJlskziNuQQsGWgcHLHMsF2Vk0s1nRhhha3fpbvX OHfFAEPK0ROiemZXsDwt4mMoa7LbS/j9c8aUV/mODiDp21p/NIKl5/8c1wjEwSkuaTZi ZL6w== X-Gm-Message-State: AOJu0YxLEmcTotjQh8pieQPAa3J/vXL1YD6Xqr+X97Zs2IS+/eF3Elv1 9xQvb3fhjgbhnecyMizD060= X-Google-Smtp-Source: AGHT+IG443+hefjLULzrdFkEPSyGQ0Nk1q1BDyJwXSutahsATYEZeByVLtA0m5nsKeKcUcsa7wCDKA== X-Received: by 2002:ac2:4f0b:0:b0:500:9dd4:2969 with SMTP id k11-20020ac24f0b000000b005009dd42969mr5411060lfr.59.1696018129510; Fri, 29 Sep 2023 13:08:49 -0700 (PDT) Received: from fr.lan ([46.31.31.132]) by smtp.googlemail.com with ESMTPSA id v12-20020a19740c000000b005056e9b734esm422439lfe.151.2023.09.29.13.08.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Sep 2023 13:08:49 -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 v2 2/2] iio: adc: Add driver support for MAX34408/9 Date: Fri, 29 Sep 2023 23:08:44 +0300 Message-ID: <20230929200844.23316-3-fr0st61te@gmail.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230929200844.23316-1-fr0st61te@gmail.com> References: <20230929200844.23316-1-fr0st61te@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org 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 | 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..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..f576c65e3900 --- /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 +#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) + +/* 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. + * @rsense: Rsense value in uOhm. + */ +struct max34408_data { + struct regmap *regmap; + struct device *dev; + struct mutex lock; + u32 input1_rsense; + u32 input2_rsense; + u32 input3_rsense; + u32 input4_rsense; +}; + +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) \ + { \ + .type = IIO_CURRENT, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_OFFSET), \ + .channel = (_index), \ + .indexed = 1, \ + } + +static const struct iio_chan_spec max34408_channels[] = { + MAX34008_CHANNEL(0), + MAX34008_CHANNEL(1), +}; + +static const struct iio_chan_spec max34409_channels[] = { + MAX34008_CHANNEL(0), + MAX34008_CHANNEL(1), + MAX34008_CHANNEL(2), + MAX34008_CHANNEL(3), +}; + +static int max34408_read_adc(struct max34408_data *max34408, int channel, + int *val) +{ + u32 adc_reg; + + switch (channel) { + case 0: + adc_reg = MAX34408_ADC1_REG; + break; + case 1: + adc_reg = MAX34408_ADC2_REG; + break; + case 2: + adc_reg = MAX34409_ADC3_REG; + break; + case 3: + adc_reg = MAX34409_ADC4_REG; + break; + default: + return -EINVAL; + } + + return regmap_read(max34408->regmap, adc_reg, val); +} + +static int max34408_read_adc_avg(struct max34408_data *max34408, int channel, int *val) +{ + unsigned int ctrl; + int rc; + u8 tmp; + + guard(mutex)(&max34408->lock); + rc = regmap_read(max34408->regmap, MAX34408_CONTROL_REG, (u32 *)&ctrl); + if (rc) + return rc; + + /* set averaging (0b100) default values*/ + tmp = ctrl; + ctrl |= MAX34408_CONTROL_AVG2; + ctrl &= ~MAX34408_CONTROL_AVG1; + ctrl &= ~MAX34408_CONTROL_AVG0; + rc = regmap_write(max34408->regmap, MAX34408_CONTROL_REG, ctrl); + if (rc) { + dev_err(max34408->dev, + "Error (%d) writing control register\n", rc); + return rc; + } + + rc = max34408_read_adc(max34408, channel, val); + if (rc) + return rc; + + /* back to old values */ + rc = regmap_write(max34408->regmap, MAX34408_CONTROL_REG, tmp); + 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 input_rsense; + int rc; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + rc = max34408_read_adc_avg(max34408, chan->channel, + 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 + */ + switch (chan->channel) { + case 0: + input_rsense = max34408->input1_rsense; + break; + case 1: + input_rsense = max34408->input2_rsense; + break; + case 2: + input_rsense = max34408->input3_rsense; + break; + case 3: + input_rsense = max34408->input4_rsense; + break; + default: + return -EINVAL; + } + *val = 10000 / input_rsense; + *val2 = 8; + return IIO_VAL_FRACTIONAL_LOG2; + case IIO_CHAN_INFO_OFFSET: + *val = 0; + return IIO_VAL_INT; + 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; + const struct of_device_id *match; + struct max34408_data *max34408; + struct iio_dev *indio_dev; + struct regmap *regmap; + int rc; + + match = of_match_device(max34408_of_match, &client->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(&client->dev, PTR_ERR(regmap), + "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); + max34408->regmap = regmap; + max34408->dev = &client->dev; + mutex_init(&max34408->lock); + + rc = device_property_read_u32(&client->dev, + "maxim,input1-rsense-val-micro-ohms", + &max34408->input1_rsense); + if (rc) + max34408->input1_rsense = MAX34408_DEFAULT_RSENSE; + + rc = device_property_read_u32(&client->dev, + "maxim,input2-rsense-val-micro-ohms", + &max34408->input2_rsense); + if (rc) + max34408->input2_rsense = MAX34408_DEFAULT_RSENSE; + + rc = device_property_read_u32(&client->dev, + "maxim,input3-rsense-val-micro-ohms", + &max34408->input3_rsense); + if (rc) + max34408->input3_rsense = MAX34408_DEFAULT_RSENSE; + + rc = device_property_read_u32(&client->dev, + "maxim,input4-rsense-val-micro-ohms", + &max34408->input4_rsense); + if (rc) + max34408->input4_rsense = MAX34408_DEFAULT_RSENSE; + + /* 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(&client->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");