From patchwork Fri Dec 8 15:51:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: David Lechner X-Patchwork-Id: 752124 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=baylibre-com.20230601.gappssmtp.com header.i=@baylibre-com.20230601.gappssmtp.com header.b="2MoUcj9Y" Received: from mail-ot1-x335.google.com (mail-ot1-x335.google.com [IPv6:2607:f8b0:4864:20::335]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9C744172A for ; Fri, 8 Dec 2023 07:52:38 -0800 (PST) Received: by mail-ot1-x335.google.com with SMTP id 46e09a7af769-6d9e993d94dso509211a34.0 for ; Fri, 08 Dec 2023 07:52:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20230601.gappssmtp.com; s=20230601; t=1702050758; x=1702655558; 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=ywOUvwzhsPnUFdJdVAjFAoCNpta5mHBDXP1oy697KOo=; b=2MoUcj9YFvkv2iRwz7e5CrWUlp8P4KgoQlid/1FtDaSak9neRPP3SoCEzYTFnIFfSn i4I2pG/eeYui4Da6DljLGEFGg31TnAy1nxaumz/75ToaeA+/QvqiFP8L7Gw2Gl0eUfbR 9d5jhI8PO72VXhdDHIjdDUf7QgU7XrQEkmKSxaVgItm3Y4LsvlF89Tf0dfXKAZxCGKGf ykqvY6PW6nui/cOFS+JHrKdC7UT3Rpx65krKlC1YZus1fQfDSnfPSQNMPxbudHx7sRE9 oy0wZ88t1itnyyk+Arw525cvjYL68+eVypJMfeAcJCweTwRst5tjkyj6JssEAyYTLrYw 22eg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702050758; x=1702655558; 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=ywOUvwzhsPnUFdJdVAjFAoCNpta5mHBDXP1oy697KOo=; b=JufgrUR+s3jm2ZETPKlIBev/F+oEHBqweUWJWkiNb2HObWSQbj9b3J8W9F3xRrme1b VZoBGro2FOZY8gFA88h5MhjhpA5My1ZXFaMkVdd53SLXWyCuF9v9O44JYMK7hH9dXkv4 0xkSQOMzAzq/wLvkoKqTfAhD0P7kMZ1Cwr4vXKYP3P8v3d8hmxsK+UJhdQPo6FbbQGgK FjCqSnUOxAm9Tyn6FGPeMyVlqFazxpOrloe8jgLo27pOs+JYIgngYssvEO1CJEaqJxrs gvBnK6vygm2C5xgOdNzTyqYfA7NFplJ/RDi6ndkHgVIdoUx0QixTSuFsOdTZzpMz6voK 364Q== X-Gm-Message-State: AOJu0YxMFME0CjFomw7rHfiyW0HnOxIjjub+K+BuI7S1ktgAt4Lda/ow sOdraQM/EdTAdPj7JZWt15rkTA== X-Google-Smtp-Source: AGHT+IHkG+gyplKVBDpxQ76jLBUwd33s9xaUCNOB8yW9om0k0ka6BQc2F2sLG95kvFY6zyPXV49f9Q== X-Received: by 2002:a9d:6ac1:0:b0:6d9:9be4:b8e8 with SMTP id m1-20020a9d6ac1000000b006d99be4b8e8mr195187otq.77.1702050757957; Fri, 08 Dec 2023 07:52:37 -0800 (PST) Received: from freyr.lechnology.com (ip98-183-112-25.ok.ok.cox.net. [98.183.112.25]) by smtp.gmail.com with ESMTPSA id v3-20020a9d7d03000000b006d99d363723sm332032otn.63.2023.12.08.07.52.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 Dec 2023 07:52:37 -0800 (PST) From: David Lechner To: linux-iio@vger.kernel.org, devicetree@vger.kernel.org Cc: David Lechner , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Cameron , Michael Hennerich , =?utf-8?q?Nuno_S=C3=A1?= , Alexandru Ardelean , Liam Girdwood , Mark Brown , linux-kernel@vger.kernel.org Subject: [PATCH 1/2] dt-bindings: iio: adc: Add binding for AD7380 ADCs Date: Fri, 8 Dec 2023 09:51:40 -0600 Message-ID: <20231208-ad7380-mainline-v1-1-2b33fe2f44ae@baylibre.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231208-ad7380-mainline-v1-0-2b33fe2f44ae@baylibre.com> References: <20231208-ad7380-mainline-v1-0-2b33fe2f44ae@baylibre.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mailer: b4 0.12.4 This adds a binding specification for the Analog Devices Inc. AD7380 family of ADCs. Signed-off-by: David Lechner --- .../devicetree/bindings/iio/adc/adi,ad7380.yaml | 102 +++++++++++++++++++++ MAINTAINERS | 9 ++ 2 files changed, 111 insertions(+) diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml new file mode 100644 index 000000000000..e9a0b72cd9d3 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml @@ -0,0 +1,102 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/adc/adi,ad7380.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices Simultaneous Sampling Analog to Digital Converters + +maintainers: + - Michael Hennerich + - Nuno Sá + +description: | + * https://www.analog.com/en/products/ad7380.html + * https://www.analog.com/en/products/ad7381.html + * https://www.analog.com/en/products/ad7383.html + * https://www.analog.com/en/products/ad7384.html + +$ref: /schemas/spi/spi-peripheral-props.yaml# + +properties: + compatible: + enum: + - adi,ad7380 + - adi,ad7381 + - adi,ad7383 + - adi,ad7384 + + reg: true + + spi-max-frequency: + maximum: 80000000 + spi-cpol: true + spi-cpha: true + + adi,sdo-mode: + $ref: /schemas/types.yaml#/definitions/string + enum: [ 1-wire, 2-wire ] + description: + In 1-wire mode, the SDOA pin acts as the sole data line and the SDOB/ALERT + pin acts as the ALERT interrupt signal. In 2-wire mode, data for input A + is read from SDOA and data for input B is read from SDOB/ALERT (and the + ALERT interrupt signal is not available). + + vcc-supply: + description: A 3V to 3.6V supply that powers the chip. + + vlogic-supply: + description: + A 1.65V to 3.6V supply for the logic pins. + + refio-supply: + description: + A 2.5V to 3.3V supply for the external reference voltage. When omitted, + the internal 2.5V reference is used. + + interrupts: + description: + When the device is using 1-wire mode, this property is used to optionally + specify the ALERT interrupt. + maxItems: 1 + +required: + - compatible + - reg + - adi,sdo-mode + - vcc-supply + - vlogic-supply + +allOf: + - if: + properties: + adi,sdo-mode: + const: 2-wire + then: + properties: + interrupts: false + +unevaluatedProperties: false + +examples: + - | + spi { + #address-cells = <1>; + #size-cells = <0>; + + adc@0 { + compatible = "adi,ad7380"; + reg = <0>; + + spi-cpol; + spi-cpha; + spi-max-frequency = <80000000>; + + adi,sdo-mode = "1-wire"; + interrupts = <27>; + + vcc-supply = <&supply_3_3V>; + vlogic-supply = <&supply_3_3V>; + refio-supply = <&supply_2_5V>; + }; + }; diff --git a/MAINTAINERS b/MAINTAINERS index fe1f6f97f96a..e2a998be5879 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -430,6 +430,15 @@ W: http://wiki.analog.com/AD7142 W: https://ez.analog.com/linux-software-drivers F: drivers/input/misc/ad714x.c +AD738X ADC DRIVER (AD7380/1/2/4) +M: Michael Hennerich +M: Nuno Sá +R: David Lechner +S: Supported +W: https://wiki.analog.com/resources/tools-software/linux-drivers/iio-adc/ad738x +W: https://ez.analog.com/linux-software-drivers +F: Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml + AD7877 TOUCHSCREEN DRIVER M: Michael Hennerich S: Supported From patchwork Fri Dec 8 15:51:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Lechner X-Patchwork-Id: 751749 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=baylibre-com.20230601.gappssmtp.com header.i=@baylibre-com.20230601.gappssmtp.com header.b="url98Hg3" Received: from mail-ot1-x331.google.com (mail-ot1-x331.google.com [IPv6:2607:f8b0:4864:20::331]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 829411738 for ; Fri, 8 Dec 2023 07:52:39 -0800 (PST) Received: by mail-ot1-x331.google.com with SMTP id 46e09a7af769-6d9e9b72ecfso482516a34.3 for ; Fri, 08 Dec 2023 07:52:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20230601.gappssmtp.com; s=20230601; t=1702050759; x=1702655559; 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=AmJuRdP3O/ZSJRjxTAVnHQ3nmd13RM5mLsgR/Ebj3Jk=; b=url98Hg3h+VDqcI5K68BBfHfN7dA8lfCBBwqseXW8xekHmATBFlq4rKMum80pK8Lco /b39nJiprZAXX5S0xE1ywj1PUlY7TZgF68lKW1BcqZlDWydK8vJrUPnW8M58Vgk3zo2v P72oXu8tDcgFh9Juit2aCaszt1Ahdz/gzsWPitBJZW+1C64l2PrFOuZEDLNw3OEWAM+z aUem6vJ2YpGKXnwvzLHfoxSQLZAICNE70WxP4+W6oRYwtPt3g1iYyA3pyQRLOkGNFwIn K4pHXjK3awxWBy+1RW3TSU2KOeK8/tG3Ot/RsXZjUg+WGA8L33T4CNeurRrw+4Ap9t6u 12Eg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702050759; x=1702655559; 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=AmJuRdP3O/ZSJRjxTAVnHQ3nmd13RM5mLsgR/Ebj3Jk=; b=p27BdkNoWffKPEVwHpVMtnSrY0J8ZRZCWPgHUeXhVKNqC6zQRyXJ7hxVF6YtA2NFrd qOAGmgCwvNrH8Uy747O3ws/HAqEgGAF7+Cye2+BVKckU9SvHweX/oH3Ugdd2MVOLEiXe kkXi9OGb6zVG4MVmnXFgVbuys+dJFyVzPn9N3D7NSMxJgMb9fhCpIskRM3MhnRO84hnS YSsQTs0tNQJ0eSTXh8hkLpqeTfy6zIvovvru7TVHyjGwP0B/8msbDw31MszrAlb1Qyy2 pW3JeJUg2CIKMDJIiEyxuRtu/C8CRr6K6j/ZmZSv5zm8euExkw+51f3KAY6htKFNQwiP d+Fw== X-Gm-Message-State: AOJu0Yw580RknLK8tL/CzPYmCAb9NU2H/BdP+PUch4QTkv9WblM6/64W D2XNu6qWx7PLod5ccONrlbW+0w== X-Google-Smtp-Source: AGHT+IG+jNUXFCzt+8HN/E6I0Sc5myARsi+3lXLrwg50UgWtfEQRkg4cms244aRKyZd2h5O5NHexkA== X-Received: by 2002:a05:6830:1e04:b0:6d9:df71:9fc2 with SMTP id s4-20020a0568301e0400b006d9df719fc2mr266937otr.8.1702050758783; Fri, 08 Dec 2023 07:52:38 -0800 (PST) Received: from freyr.lechnology.com (ip98-183-112-25.ok.ok.cox.net. [98.183.112.25]) by smtp.gmail.com with ESMTPSA id v3-20020a9d7d03000000b006d99d363723sm332032otn.63.2023.12.08.07.52.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 Dec 2023 07:52:38 -0800 (PST) From: David Lechner To: linux-iio@vger.kernel.org, devicetree@vger.kernel.org Cc: David Lechner , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Cameron , Michael Hennerich , =?utf-8?q?Nuno_S=C3=A1?= , Alexandru Ardelean , Liam Girdwood , Mark Brown , linux-kernel@vger.kernel.org, Stefan Popa Subject: [PATCH 2/2] iio: adc: ad7380: new driver for AD7380 ADCs Date: Fri, 8 Dec 2023 09:51:41 -0600 Message-ID: <20231208-ad7380-mainline-v1-2-2b33fe2f44ae@baylibre.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231208-ad7380-mainline-v1-0-2b33fe2f44ae@baylibre.com> References: <20231208-ad7380-mainline-v1-0-2b33fe2f44ae@baylibre.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mailer: b4 0.12.4 This adds a new driver for the AD7380 family ADCs. The driver currently implements basic support for the AD7380, AD7381, AD7383, and AD7384 2-channel differential ADCs. Support for additional single-ended and 4-channel chips that use the same register map as well as additional features of the chip will be added in future patches. Co-developed-by: Stefan Popa Signed-off-by: Stefan Popa Signed-off-by: David Lechner --- MAINTAINERS | 1 + drivers/iio/adc/Kconfig | 16 ++ drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ad7380.c | 467 +++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 485 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index e2a998be5879..5a54620a31b8 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -438,6 +438,7 @@ S: Supported W: https://wiki.analog.com/resources/tools-software/linux-drivers/iio-adc/ad738x W: https://ez.analog.com/linux-software-drivers F: Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml +F: drivers/iio/adc/ad7380.c AD7877 TOUCHSCREEN DRIVER M: Michael Hennerich diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 35f9867da12c..cbfd626712e3 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -122,6 +122,22 @@ config AD7298 To compile this driver as a module, choose M here: the module will be called ad7298. +config AD7380 + tristate "Analog Devices AD7380 ADC driver" + depends on SPI_MASTER + select IIO_BUFFER + select IIO_TRIGGER + select IIO_TRIGGERED_BUFFER + help + AD7380 is a family of simultaneous sampling ADCs that share the same + SPI register map and have similar pinouts. + + Say yes here to build support for Analog Devices AD7380 ADC and + similar chips. + + To compile this driver as a module, choose M here: the module will be + called ad7380. + config AD7476 tristate "Analog Devices AD7476 1-channel ADCs driver and other similar devices from AD and TI" depends on SPI diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index bee11d442af4..e046d8004f41 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_AD7291) += ad7291.o obj-$(CONFIG_AD7292) += ad7292.o obj-$(CONFIG_AD7298) += ad7298.o obj-$(CONFIG_AD7923) += ad7923.o +obj-$(CONFIG_AD7476) += ad7380.o obj-$(CONFIG_AD7476) += ad7476.o obj-$(CONFIG_AD7606_IFACE_PARALLEL) += ad7606_par.o obj-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o diff --git a/drivers/iio/adc/ad7380.c b/drivers/iio/adc/ad7380.c new file mode 100644 index 000000000000..6a5ec59bd1fd --- /dev/null +++ b/drivers/iio/adc/ad7380.c @@ -0,0 +1,467 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Analog Devices AD738x Simultaneous Sampling SAR ADCs + * + * Copyright 2017 Analog Devices Inc. + * Copyright 2023 BayLibre, SAS + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +/* 2.5V internal reference voltage */ +#define AD7380_INTERNAL_REF_MV 2500 + +/* reading and writing registers is more reliable at lower than max speed */ +#define AD7380_REG_WR_SPEED_HZ 10000000 + +#define AD7380_REG_WR BIT(15) +#define AD7380_REG_REGADDR GENMASK(14, 12) +#define AD7380_REG_DATA GENMASK(11, 0) + +#define AD7380_REG_ADDR_NOP 0x0 +#define AD7380_REG_ADDR_CONFIG1 0x1 +#define AD7380_REG_ADDR_CONFIG2 0x2 +#define AD7380_REG_ADDR_ALERT 0x3 +#define AD7380_REG_ADDR_ALERT_LOW_TH 0x4 +#define AD7380_REG_ADDR_ALERT_HIGH_TH 0x5 + +#define AD7380_CONFIG1_OS_MODE BIT(9) +#define AD7380_CONFIG1_OSR GENMASK(8, 6) +#define AD7380_CONFIG1_CRC_W BIT(5) +#define AD7380_CONFIG1_CRC_R BIT(4) +#define AD7380_CONFIG1_ALERTEN BIT(3) +#define AD7380_CONFIG1_RES BIT(2) +#define AD7380_CONFIG1_REFSEL BIT(1) +#define AD7380_CONFIG1_PMODE BIT(0) + +#define AD7380_CONFIG2_SDO2 GENMASK(9, 8) +#define AD7380_CONFIG2_SDO BIT(8) +#define AD7380_CONFIG2_RESET GENMASK(7, 0) + +#define AD7380_CONFIG2_RESET_SOFT 0x3C +#define AD7380_CONFIG2_RESET_HARD 0xFF + +#define AD7380_ALERT_LOW_TH GENMASK(11, 0) +#define AD7380_ALERT_HIGH_TH GENMASK(11, 0) + +struct ad7380_chip_info { + const char *name; + const struct iio_chan_spec *channels; + unsigned int num_channels; +}; + +#define AD7380_DIFFERENTIAL_CHANNEL(index, bits) { \ + .type = IIO_VOLTAGE, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + .indexed = 1, \ + .differential = 1, \ + .channel = 2 * (index), \ + .channel2 = 2 * (index) + 1, \ + .scan_index = (index), \ + .scan_type = { \ + .sign = 's', \ + .realbits = (bits), \ + .storagebits = 16, \ + .endianness = IIO_CPU, \ + }, \ +} + +#define DEFINE_AD7380_DIFFERENTIAL_2_CHANNEL(name, bits) \ +static const struct iio_chan_spec name[] = { \ + AD7380_DIFFERENTIAL_CHANNEL(0, bits), \ + AD7380_DIFFERENTIAL_CHANNEL(1, bits), \ + IIO_CHAN_SOFT_TIMESTAMP(2), \ +} + +/* fully differential */ +DEFINE_AD7380_DIFFERENTIAL_2_CHANNEL(ad7380_channels, 16); +DEFINE_AD7380_DIFFERENTIAL_2_CHANNEL(ad7381_channels, 14); +/* pseudo differential */ +DEFINE_AD7380_DIFFERENTIAL_2_CHANNEL(ad7383_channels, 16); +DEFINE_AD7380_DIFFERENTIAL_2_CHANNEL(ad7384_channels, 14); + +static const struct ad7380_chip_info ad7380_chip_info = { + .name = "ad7380", + .channels = ad7380_channels, + .num_channels = ARRAY_SIZE(ad7380_channels), +}; + +static const struct ad7380_chip_info ad7381_chip_info = { + .name = "ad7381", + .channels = ad7381_channels, + .num_channels = ARRAY_SIZE(ad7381_channels), +}; + +static const struct ad7380_chip_info ad7383_chip_info = { + .name = "ad7383", + .channels = ad7383_channels, + .num_channels = ARRAY_SIZE(ad7383_channels), +}; + +static const struct ad7380_chip_info ad7384_chip_info = { + .name = "ad7384", + .channels = ad7384_channels, + .num_channels = ARRAY_SIZE(ad7384_channels), +}; + +struct ad7380_state { + const struct ad7380_chip_info *chip_info; + struct spi_device *spi; + struct regulator *vref; + struct regmap *regmap; + /* + * DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + * Make the buffer large enough for 2 16-bit samples and one 64-bit + * aligned 64 bit timestamp. + */ + struct { + u16 raw[2]; + s64 ts __aligned(8); + } scan_data __aligned(IIO_DMA_MINALIGN); + u16 tx[2]; + u16 rx[2]; +}; + +static int ad7380_regmap_reg_write(void *context, unsigned int reg, + unsigned int val) +{ + struct ad7380_state *st = context; + struct spi_transfer xfer = { + .speed_hz = AD7380_REG_WR_SPEED_HZ, + .bits_per_word = 16, + .len = 2, + .tx_buf = &st->tx[0], + }; + + st->tx[0] = FIELD_PREP(AD7380_REG_WR, 1) | + FIELD_PREP(AD7380_REG_REGADDR, reg) | + FIELD_PREP(AD7380_REG_DATA, val); + + return spi_sync_transfer(st->spi, &xfer, 1); +} + +static int ad7380_regmap_reg_read(void *context, unsigned int reg, + unsigned int *val) +{ + struct ad7380_state *st = context; + struct spi_transfer xfers[] = { + { + .speed_hz = AD7380_REG_WR_SPEED_HZ, + .bits_per_word = 16, + .len = 2, + .tx_buf = &st->tx[0], + .cs_change = 1, + .cs_change_delay = { + .value = 10, /* t[CSH] */ + .unit = SPI_DELAY_UNIT_NSECS, + }, + }, { + .speed_hz = AD7380_REG_WR_SPEED_HZ, + .bits_per_word = 16, + .len = 2, + .rx_buf = &st->rx[0], + }, + }; + int ret; + + st->tx[0] = FIELD_PREP(AD7380_REG_WR, 0) | + FIELD_PREP(AD7380_REG_REGADDR, reg) | + FIELD_PREP(AD7380_REG_DATA, 0); + + ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers)); + if (ret < 0) + return ret; + + *val = FIELD_GET(AD7380_REG_DATA, st->rx[0]); + + return 0; +} + +const struct regmap_config ad7380_regmap_config = { + .reg_bits = 3, + .val_bits = 12, + .reg_read = ad7380_regmap_reg_read, + .reg_write = ad7380_regmap_reg_write, + .max_register = AD7380_REG_ADDR_ALERT_HIGH_TH, + .can_sleep = true, +}; + +static int ad7380_debugfs_reg_access(struct iio_dev *indio_dev, u32 reg, + u32 writeval, u32 *readval) +{ + struct ad7380_state *st = iio_priv(indio_dev); + int ret; + + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + + if (readval) + ret = regmap_read(st->regmap, reg, readval); + else + ret = regmap_write(st->regmap, reg, writeval); + + iio_device_release_direct_mode(indio_dev); + + return ret; +} + +static irqreturn_t ad7380_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct ad7380_state *st = iio_priv(indio_dev); + struct spi_transfer xfer = { + .bits_per_word = st->chip_info->channels[0].scan_type.realbits, + .len = 4, + .rx_buf = &st->scan_data, + }; + int ret; + + ret = spi_sync_transfer(st->spi, &xfer, 1); + + if (ret == 0) + iio_push_to_buffers_with_timestamp(indio_dev, &st->scan_data, + pf->timestamp); + + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +static int ad7380_read_direct(struct ad7380_state *st, + struct iio_chan_spec const *chan, int *val) +{ + struct spi_transfer xfers[] = { + /* toggle CS (no data xfer) to trigger a conversion */ + { + .speed_hz = AD7380_REG_WR_SPEED_HZ, + .bits_per_word = chan->scan_type.realbits, + .delay = { + .value = 190, /* t[CONVERT] */ + .unit = SPI_DELAY_UNIT_NSECS, + }, + .cs_change = 1, + .cs_change_delay = { + .value = 10, /* t[CSH] */ + .unit = SPI_DELAY_UNIT_NSECS, + }, + }, + /* then read both channels */ + { + .speed_hz = AD7380_REG_WR_SPEED_HZ, + .bits_per_word = chan->scan_type.realbits, + .rx_buf = &st->rx[0], + .len = 4, + }, + }; + int ret; + + ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers)); + + if (ret < 0) + return ret; + + *val = sign_extend32(st->rx[chan->scan_index], + chan->scan_type.realbits - 1); + + return IIO_VAL_INT; +} + +static int ad7380_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long info) +{ + struct ad7380_state *st = iio_priv(indio_dev); + int ret; + + switch (info) { + case IIO_CHAN_INFO_RAW: + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + + ret = ad7380_read_direct(st, chan, val); + iio_device_release_direct_mode(indio_dev); + + return ret; + case IIO_CHAN_INFO_SCALE: + if (st->vref) { + ret = regulator_get_voltage(st->vref); + if (ret < 0) + return ret; + + *val = ret / 1000; + } else { + *val = AD7380_INTERNAL_REF_MV; + } + + *val2 = chan->scan_type.realbits; + + return IIO_VAL_FRACTIONAL_LOG2; + } + + return -EINVAL; +} + +static const struct iio_info ad7380_info = { + .read_raw = &ad7380_read_raw, + .debugfs_reg_access = &ad7380_debugfs_reg_access, +}; + +static int ad7380_init(struct ad7380_state *st) +{ + int ret; + + /* perform hard reset */ + ret = regmap_update_bits(st->regmap, AD7380_REG_ADDR_CONFIG2, + AD7380_CONFIG2_RESET, + FIELD_PREP(AD7380_CONFIG2_RESET, + AD7380_CONFIG2_RESET_HARD)); + if (ret < 0) + return ret; + + + /* select internal or external reference voltage */ + ret = regmap_update_bits(st->regmap, AD7380_REG_ADDR_CONFIG1, + AD7380_CONFIG1_REFSEL, + FIELD_PREP(AD7380_CONFIG1_REFSEL, !!st->vref)); + if (ret < 0) + return ret; + + /* SPI 1-wire mode */ + return regmap_update_bits(st->regmap, AD7380_REG_ADDR_CONFIG2, + AD7380_CONFIG2_SDO, + FIELD_PREP(AD7380_CONFIG2_SDO, 1)); +} + +static void ad7380_release_regulator(void *p) +{ + struct regulator *reg = p; + + regulator_disable(reg); +} + +static int ad7380_probe(struct spi_device *spi) +{ + struct iio_dev *indio_dev; + struct ad7380_state *st; + const char *str_val; + int ret; + + ret = device_property_read_string(&spi->dev, "adi,sdo-mode", &str_val); + if (ret < 0) + return dev_err_probe(&spi->dev, ret, + "Failed to read adi,sdo-mode property\n"); + + if (strcmp(str_val, "1-wire")) + return dev_err_probe(&spi->dev, -EINVAL, + "Only 1-wire SDO is supported\n"); + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + st = iio_priv(indio_dev); + st->spi = spi; + st->chip_info = spi_get_device_match_data(spi); + + st->vref = devm_regulator_get_optional(&spi->dev, "refio"); + if (IS_ERR(st->vref)) { + /* + * If there is no REFIO supply, then it means that we are using + * the internal 2.5V reference. + */ + if (PTR_ERR(st->vref) == -ENODEV) + st->vref = NULL; + else + return dev_err_probe(&spi->dev, PTR_ERR(st->vref), + "Failed to get refio regulator\n"); + } + + if (st->vref) { + ret = regulator_enable(st->vref); + if (ret) + return ret; + + ret = devm_add_action_or_reset(&spi->dev, ad7380_release_regulator, + st->vref); + if (ret) + return ret; + } + + st->regmap = devm_regmap_init(&spi->dev, NULL, st, &ad7380_regmap_config); + if (IS_ERR(st->regmap)) + return dev_err_probe(&spi->dev, PTR_ERR(st->regmap), + "failed to allocate register map\n"); + + + indio_dev->channels = st->chip_info->channels; + indio_dev->num_channels = st->chip_info->num_channels; + indio_dev->dev.parent = &spi->dev; + indio_dev->name = st->chip_info->name; + indio_dev->info = &ad7380_info; + indio_dev->modes = INDIO_DIRECT_MODE; + + ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev, + iio_pollfunc_store_time, + ad7380_trigger_handler, NULL); + if (ret) + return ret; + + ret = ad7380_init(st); + if (ret) + return ret; + + return devm_iio_device_register(&spi->dev, indio_dev); +} + +static const struct of_device_id ad7380_of_match_table[] = { + { .compatible = "adi,ad7380", .data = &ad7380_chip_info }, + { .compatible = "adi,ad7381", .data = &ad7381_chip_info }, + { .compatible = "adi,ad7383", .data = &ad7383_chip_info }, + { .compatible = "adi,ad7384", .data = &ad7384_chip_info }, + { } +}; + +static const struct spi_device_id ad7380_id_table[] = { + { "ad7380", (kernel_ulong_t)&ad7380_chip_info }, + { "ad7381", (kernel_ulong_t)&ad7381_chip_info }, + { "ad7383", (kernel_ulong_t)&ad7383_chip_info }, + { "ad7384", (kernel_ulong_t)&ad7384_chip_info }, + { } +}; +MODULE_DEVICE_TABLE(spi, ad7380_id_table); + +static struct spi_driver ad7380_driver = { + .driver = { + .name = "ad7380", + .of_match_table = ad7380_of_match_table, + }, + .probe = ad7380_probe, + .id_table = ad7380_id_table, +}; +module_spi_driver(ad7380_driver); + +MODULE_AUTHOR("Stefan Popa "); +MODULE_DESCRIPTION("Analog Devices AD738x ADC driver"); +MODULE_LICENSE("GPL");