From patchwork Tue Dec 4 17:59:54 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Murphy X-Patchwork-Id: 152834 Delivered-To: patch@linaro.org Received: by 2002:a2e:299d:0:0:0:0:0 with SMTP id p29-v6csp8357418ljp; Tue, 4 Dec 2018 10:00:10 -0800 (PST) X-Google-Smtp-Source: AFSGD/Wyl7glH7jxFidpwr9ZQ2xYJJJqCsJhYg3o6CmLFCPH78lNMchVwVZt7Y+jlVej1VNglMWC X-Received: by 2002:a63:495b:: with SMTP id y27mr17527910pgk.32.1543946409973; Tue, 04 Dec 2018 10:00:09 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1543946409; cv=none; d=google.com; s=arc-20160816; b=r5Z4l/JWAY9XtNvnItkFMvErdAxUmTENCe8IB4966stURF5QUdZXbHfueXfQoGH+dm dmJkMljGsCtJDcUnbN2ztXxoH61c7WCXq3JVAjQQmfTAF5MaxqxTsCJhsIFGKdeiFv9U 9W7prIGVDMirD2gojaB528QICPSrWanSckOQZWfx4mvJHfcVqjmcDzae8Ws9wn9Rt1Fk QUEBj9JbmmEEXwhoIYnxPHJDy5Om6bwUNaNwR8FS+MkTj2CCIujEX37DhMOK3/SMXDFh riYHN5+KRWEh2gnTeCCvOzWkTDtArZYhVq4ysPg9nmqsFO1RUksurXgsCJBa27OPNf2A 69bA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:message-id:date:subject:cc :to:from:dkim-signature; bh=9V25X/s/7z9j5DxzpgBZfsq8q4Yjw8TDD4F1Bwxzkow=; b=es0gvlXCJQY0foCkyTSuM6gLvBN2ertkuSJGLukeAeFrkBlCZ3rNtqCekQHiKiaflU 0Px4J/xrnXWFefmwCP/UzAjNr6xxRe0mV35/V+stAyqfnyAqJ84waw4EHcHBYsh0GUm8 fVwCkvJvmF3Rlue9Mwpt6thbe2nXW6ub8qR3pcAXrlX57zljDf3dNMH3TL3M0V6P380E Uos5iDy5X2qT4bsPtcoIUi21untNQi4WDVrSsV3vT0gYwlZW8lD9ACTInR0oEQdu3PNO X6pGxBHFVfEVjT1QyysoxMoaNE69RBgo0y72P86w/OI2fQrnYuuHsLTuz2MPcQlSesNa /stg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b="qm6WNx/H"; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id m64si18807019pfb.224.2018.12.04.10.00.09; Tue, 04 Dec 2018 10:00:09 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b="qm6WNx/H"; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727385AbeLDSAI (ORCPT + 31 others); Tue, 4 Dec 2018 13:00:08 -0500 Received: from lelv0143.ext.ti.com ([198.47.23.248]:37680 "EHLO lelv0143.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726083AbeLDSAH (ORCPT ); Tue, 4 Dec 2018 13:00:07 -0500 Received: from fllv0035.itg.ti.com ([10.64.41.0]) by lelv0143.ext.ti.com (8.15.2/8.15.2) with ESMTP id wB4I05lc024478; Tue, 4 Dec 2018 12:00:05 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1543946406; bh=9V25X/s/7z9j5DxzpgBZfsq8q4Yjw8TDD4F1Bwxzkow=; h=From:To:CC:Subject:Date; b=qm6WNx/Hi45VCm6mbRcSSpYIPbLvIwdfcsnjcZtUpSLNKKtKz0ZQz3M/tiU0EFgY/ p66s+axNM+2ihN8zCI9CAReYQuWw+MuboqFUaJ4wKsW+GbxXB0lv2E4+YIjEXr0Nb0 Q5jEV7Z52PTFQPeTSi32yqp/sVA0jkM+4oBfX9Ow= Received: from DLEE108.ent.ti.com (dlee108.ent.ti.com [157.170.170.38]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTPS id wB4I05Ec008996 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 4 Dec 2018 12:00:05 -0600 Received: from DLEE110.ent.ti.com (157.170.170.21) by DLEE108.ent.ti.com (157.170.170.38) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1591.10; Tue, 4 Dec 2018 12:00:05 -0600 Received: from dflp33.itg.ti.com (10.64.6.16) by DLEE110.ent.ti.com (157.170.170.21) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.1591.10 via Frontend Transport; Tue, 4 Dec 2018 12:00:05 -0600 Received: from legion.dal.desgin.ti.com (legion.dal.design.ti.com [128.247.22.53]) by dflp33.itg.ti.com (8.14.3/8.13.8) with ESMTP id wB4I05ZZ017924; Tue, 4 Dec 2018 12:00:05 -0600 Received: from localhost (a0272616local-lt.dhcp.ti.com [172.22.101.186]) by legion.dal.desgin.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id wB4I04U27060; Tue, 4 Dec 2018 12:00:04 -0600 (CST) From: Dan Murphy To: CC: , , , Dan Murphy Subject: [PATCH 1/2] iio: ti-ads124s08: Add DT binding documentation Date: Tue, 4 Dec 2018 11:59:54 -0600 Message-ID: <20181204175955.8259-1-dmurphy@ti.com> X-Mailer: git-send-email 2.12.2 MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Adding binding documentation for Texas Instruments ADS124S08 and ADS124S06 ADC. S08 is a 12 channel ADC S06 is a 6 channel ADC Datesheet can be found here: http://www.ti.com/lit/gpn/ads124s08 Signed-off-by: Dan Murphy --- .../bindings/iio/adc/ti-ads124s08.txt | 25 +++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/adc/ti-ads124s08.txt -- 2.20.0.rc1.10.g7068cbc4ab diff --git a/Documentation/devicetree/bindings/iio/adc/ti-ads124s08.txt b/Documentation/devicetree/bindings/iio/adc/ti-ads124s08.txt new file mode 100644 index 000000000000..41ab67379ee1 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/ti-ads124s08.txt @@ -0,0 +1,25 @@ +* Texas Instruments' ads124s08 and ads124s06 ADC chip + +Required properties: + - compatible: Should be "ti,ads124s08" or "ti,ads124s06" + - reg: spi chip select number for the device + +Recommended properties: + - spi-max-frequency: Definition as per + Documentation/devicetree/bindings/spi/spi-bus.txt + - spi-cpha: Definition as per + Documentation/devicetree/bindings/spi/spi-bus.txt + +Optional properties: + - vref-supply: The regulator supply for ADC reference voltage + - reset-gpios: GPIO pin used to reset the device. + +Example: +adc@0 { + compatible = "ti,ads8688"; + reg = <0>; + vref-supply = <&vdd_supply>; + spi-max-frequency = <1000000>; + spi-cpha; + reset-gpios = <&gpio1 16 GPIO_ACTIVE_LOW>; +}; From patchwork Tue Dec 4 17:59:55 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Murphy X-Patchwork-Id: 152835 Delivered-To: patch@linaro.org Received: by 2002:a2e:299d:0:0:0:0:0 with SMTP id p29-v6csp8357438ljp; Tue, 4 Dec 2018 10:00:10 -0800 (PST) X-Google-Smtp-Source: AFSGD/UL7b0MH+DPPBglF6t3Y/yzIw1Tq2JG1qimXmsZQ0qKlW6pe3rG2YGEUvT9l/tamzMDHxRl X-Received: by 2002:a62:6d84:: with SMTP id i126mr20591600pfc.109.1543946410746; Tue, 04 Dec 2018 10:00:10 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1543946410; cv=none; d=google.com; s=arc-20160816; b=ml3ClelpjGSkwTFq82p2ICgqm8Pto0S+wWTlirKJOKeeVAkATJhiCrXjjEk+jjv57G 2UVaD9CabIDTLWBIQGuE67QIptDNy8tdlEA/fBGNDHcgxKQo5zTppbh3zoZczUNmFvVN mAmcj/7Ehl8CdUrvXhg5p/8ckschOrNYWTXaYR5z38es6M7q8/nz27ndGMr9RpF8Y15a lbqSipj1ib35iUXnKUhmHxS6VAsEo+gb6G3Z3ZomEIwzEwnPaadXTTc53d3/R7IcGKnr HeFRFSLHHWl3StOVk6AIqvp9yYlKUaJPU8BIHyLm3f1T0rxhf+2pfVOpUlCuFRtaP4uu JOQQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from; bh=0Zw/566/A1LStYnqU5fLmli5bhOVF4pgz0IYQ5fEE74=; b=lR0dhRXRWJxXn0L2/5Cvu9g/fc7AybzUTwKpBizj3N1ceIKel4LtzFQW99ZxSu+VBo kvwpqhu90Ew+u98FVtC1Rb3qWCEariWYBFEKety0gp4wjK2cuv3Oy/1cdX20eSCfz33n 6f48nne40r+UBvvVgdnq9oiGktmzssDpCj70TPgFPStJ8B3jEZz8O69DQpJ0GYeRbQp8 sdWaAfZAW9EHEExfgaiRNDOFBAIKeOoqLVV89WMipBWRTlSOdq5zZR83EdffOlu61v9q dMDXChfjdgrgVreHuBW6MCawJV7EXGK5qvTTZqQDEMc1W8FB47T4D25YgRzSNqhQRqK/ W+fQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id m64si18807019pfb.224.2018.12.04.10.00.10; Tue, 04 Dec 2018 10:00:10 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727408AbeLDSAI (ORCPT + 31 others); Tue, 4 Dec 2018 13:00:08 -0500 Received: from fllv0016.ext.ti.com ([198.47.19.142]:57746 "EHLO fllv0016.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726053AbeLDSAI (ORCPT ); Tue, 4 Dec 2018 13:00:08 -0500 Received: from lelv0265.itg.ti.com ([10.180.67.224]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id wB4I05Fl105133; Tue, 4 Dec 2018 12:00:05 -0600 Received: from DLEE114.ent.ti.com (dlee114.ent.ti.com [157.170.170.25]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id wB4I05EF005619 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 4 Dec 2018 12:00:05 -0600 Received: from DLEE104.ent.ti.com (157.170.170.34) by DLEE114.ent.ti.com (157.170.170.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1591.10; Tue, 4 Dec 2018 12:00:05 -0600 Received: from dlep33.itg.ti.com (157.170.170.75) by DLEE104.ent.ti.com (157.170.170.34) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.1591.10 via Frontend Transport; Tue, 4 Dec 2018 12:00:05 -0600 Received: from legion.dal.desgin.ti.com (legion.dal.design.ti.com [128.247.22.53]) by dlep33.itg.ti.com (8.14.3/8.13.8) with ESMTP id wB4I05up019139; Tue, 4 Dec 2018 12:00:05 -0600 Received: from localhost (a0272616local-lt.dhcp.ti.com [172.22.101.186]) by legion.dal.desgin.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id wB4I05U27064; Tue, 4 Dec 2018 12:00:05 -0600 (CST) From: Dan Murphy To: CC: , , , Dan Murphy Subject: [PATCH 2/2] iio: adc: Add the TI ads124s08 ADC code Date: Tue, 4 Dec 2018 11:59:55 -0600 Message-ID: <20181204175955.8259-2-dmurphy@ti.com> X-Mailer: git-send-email 2.12.2 In-Reply-To: <20181204175955.8259-1-dmurphy@ti.com> References: <20181204175955.8259-1-dmurphy@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce the TI ADS124S08 and the ADS124S06 ADC devices from TI. The ADS124S08 is the 12 channel ADC and the ADS124S06 is the 6 channel ADC device These devices share a common datasheet: http://www.ti.com/lit/gpn/ads124s08 Signed-off-by: Dan Murphy --- drivers/iio/adc/Kconfig | 10 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ti-ads124s08.c | 437 +++++++++++++++++++++++++++++++++ 3 files changed, 448 insertions(+) create mode 100644 drivers/iio/adc/ti-ads124s08.c -- 2.20.0.rc1.10.g7068cbc4ab diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index a52fea8749a9..e8c5686e6716 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -887,6 +887,16 @@ config TI_ADS8688 This driver can also be built as a module. If so, the module will be called ti-ads8688. +config TI_ADS124S08 + tristate "Texas Instruments ADS124S08" + depends on SPI && OF + help + If you say yes here you get support for Texas Instruments ADS124S08 + and ADS124S06 ADC chips + + This driver can also be built as a module. If so, the module will be + called ti-ads124s08. + config TI_AM335X_ADC tristate "TI's AM335X ADC driver" depends on MFD_TI_AM335X_TSCADC && HAS_DMA diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index a6e6a0b659e2..d70293abfdba 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -79,6 +79,7 @@ obj-$(CONFIG_TI_ADC161S626) += ti-adc161s626.o obj-$(CONFIG_TI_ADS1015) += ti-ads1015.o obj-$(CONFIG_TI_ADS7950) += ti-ads7950.o obj-$(CONFIG_TI_ADS8688) += ti-ads8688.o +obj-$(CONFIG_TI_ADS124S08) += ti-ads124s08.o obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o obj-$(CONFIG_TI_TLC4541) += ti-tlc4541.o obj-$(CONFIG_TWL4030_MADC) += twl4030-madc.o diff --git a/drivers/iio/adc/ti-ads124s08.c b/drivers/iio/adc/ti-ads124s08.c new file mode 100644 index 000000000000..b6fc93f37355 --- /dev/null +++ b/drivers/iio/adc/ti-ads124s08.c @@ -0,0 +1,437 @@ +// SPDX-License-Identifier: GPL-2.0 +// TI ADS124S0X chip family driver +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include +#include +#include +#include +#include + +#define ADS124S08_ID 0x00 +#define ADS124S06_ID 0x01 + +/* Commands */ +#define ADS124S_CMD_NOP 0x00 +#define ADS124S_CMD_WAKEUP 0x02 +#define ADS124S_CMD_PWRDWN 0x04 +#define ADS124S_CMD_RESET 0x06 +#define ADS124S_CMD_START 0x08 +#define ADS124S_CMD_STOP 0x0a +#define ADS124S_CMD_SYOCAL 0x16 +#define ADS124S_CMD_SYGCAL 0x17 +#define ADS124S_CMD_SFOCAL 0x19 +#define ADS124S_CMD_RDATA 0x12 +#define ADS124S_CMD_RREG 0x20 +#define ADS124S_CMD_WREG 0x40 + +/* Registers */ +#define ADS124S0X_ID 0x00 +#define ADS124S0X_STATUS 0x01 +#define ADS124S0X_INPUT_MUX 0x02 +#define ADS124S0X_PGA 0x03 +#define ADS124S0X_DATA_RATE 0x04 +#define ADS124S0X_REF 0x05 +#define ADS124S0X_IDACMAG 0x06 +#define ADS124S0X_IDACMUX 0x07 +#define ADS124S0X_VBIAS 0x08 +#define ADS124S0X_SYS 0x09 +#define ADS124S0X_OFCAL0 0x0a +#define ADS124S0X_OFCAL1 0x0b +#define ADS124S0X_OFCAL2 0x0c +#define ADS124S0X_FSCAL0 0x0d +#define ADS124S0X_FSCAL1 0x0e +#define ADS124S0X_FSCAL2 0x0f +#define ADS124S0X_GPIODAT 0x10 +#define ADS124S0X_GPIOCON 0x11 + +/* ADS124S0x common channels */ +#define ADS124S0X_AIN0 0x00 +#define ADS124S0X_AIN1 0x01 +#define ADS124S0X_AIN2 0x02 +#define ADS124S0X_AIN3 0x03 +#define ADS124S0X_AIN4 0x04 +#define ADS124S0X_AIN5 0x05 +#define ADS124S08_AINCOM 0x0c +/* ADS124S08 only channels */ +#define ADS124S08_AIN6 0x06 +#define ADS124S08_AIN7 0x07 +#define ADS124S08_AIN8 0x08 +#define ADS124S08_AIN9 0x09 +#define ADS124S08_AIN10 0x0a +#define ADS124S08_AIN11 0x0b +#define ADS124S0X_MAX_CHANNELS 12 + +#define ADS124S0X_POS_MUX_SHIFT 0x04 +#define ADS124S_INT_REF 0x09 + +#define ADS124S_START_REG_MASK 0x1f +#define ADS124S_NUM_BYTES_MASK 0x1f + +#define ADS124S_START_CONV 0x01 +#define ADS124S_STOP_CONV 0x00 + +struct ads124s_chip_info { + const struct iio_chan_spec *channels; + unsigned int num_channels; +}; + +struct ads124s_private { + const struct ads124s_chip_info *chip_info; + struct gpio_desc *reset_gpio; + struct spi_device *spi; + struct regulator *reg; + struct mutex lock; + unsigned int vref_mv; + u8 data[ADS124S0X_MAX_CHANNELS]; +}; + +#define ADS124S_CHAN(index) \ +{ \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .channel = index, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .scan_index = index, \ + .scan_type = { \ + .sign = 'u', \ + .realbits = 24, \ + .storagebits = 24, \ + .endianness = IIO_BE, \ + }, \ +} + +static const struct iio_chan_spec ads124s06_channels[] = { + ADS124S_CHAN(0), + ADS124S_CHAN(1), + ADS124S_CHAN(2), + ADS124S_CHAN(3), + ADS124S_CHAN(4), + ADS124S_CHAN(5), +}; + +static const struct iio_chan_spec ads124s08_channels[] = { + ADS124S_CHAN(0), + ADS124S_CHAN(1), + ADS124S_CHAN(2), + ADS124S_CHAN(3), + ADS124S_CHAN(4), + ADS124S_CHAN(5), + ADS124S_CHAN(6), + ADS124S_CHAN(7), + ADS124S_CHAN(8), + ADS124S_CHAN(9), + ADS124S_CHAN(10), + ADS124S_CHAN(11), +}; + +static const struct ads124s_chip_info ads124s_chip_info_tbl[] = { + [ADS124S08_ID] = { + .channels = ads124s08_channels, + .num_channels = ARRAY_SIZE(ads124s08_channels), + }, + [ADS124S06_ID] = { + .channels = ads124s06_channels, + .num_channels = ARRAY_SIZE(ads124s06_channels), + }, +}; + +static void ads124s_fill_nop(u8 *data, int start, int count) +{ + int i; + + for (i = start; i <= count; i++) + data[i] = ADS124S_CMD_NOP; + +}; + +static int ads124s_write_cmd(struct iio_dev *indio_dev, u8 command) +{ + struct ads124s_private *priv = iio_priv(indio_dev); + struct spi_transfer t[] = { + { + .tx_buf = &priv->data[0], + .len = 1, + } + }; + + priv->data[0] = command; + + return spi_sync_transfer(priv->spi, t, ARRAY_SIZE(t)); +} + +static int ads124s_write_reg(struct iio_dev *indio_dev, u8 reg, u8 data) +{ + struct ads124s_private *priv = iio_priv(indio_dev); + struct spi_transfer t[] = { + { + .tx_buf = &priv->data[0], + .len = 3, + } + }; + + priv->data[0] = ADS124S_CMD_WREG | reg; + priv->data[1] = 0x0; + priv->data[2] = data; + + return spi_sync_transfer(priv->spi, t, ARRAY_SIZE(t)); +} + +static int ads124s_reset(struct iio_dev *indio_dev) +{ + struct ads124s_private *priv = iio_priv(indio_dev); + + if (priv->reset_gpio) { + gpiod_direction_output(priv->reset_gpio, 0); + udelay(200); + gpiod_direction_output(priv->reset_gpio, 1); + } else { + return ads124s_write_cmd(indio_dev, ADS124S_CMD_RESET); + } + + return 0; +}; + +static int ads124s_read(struct iio_dev *indio_dev, unsigned int chan) +{ + struct ads124s_private *priv = iio_priv(indio_dev); + int ret; + u32 tmp; + struct spi_transfer t[] = { + { + .tx_buf = &priv->data[0], + .len = 4, + .cs_change = 1, + }, { + .tx_buf = &priv->data[1], + .rx_buf = &priv->data[1], + .len = 4, + }, + }; + + priv->data[0] = ADS124S_CMD_RDATA; + ads124s_fill_nop(priv->data, 1, 3); + + ret = spi_sync_transfer(priv->spi, t, ARRAY_SIZE(t)); + if (ret < 0) + return ret; + + tmp = priv->data[2] << 16 | priv->data[3] << 8 | priv->data[4]; + + return tmp; +} + +static int ads124s_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long m) +{ + struct ads124s_private *priv = iio_priv(indio_dev); + int ret; + + mutex_lock(&priv->lock); + switch (m) { + case IIO_CHAN_INFO_RAW: + ret = ads124s_write_reg(indio_dev, ADS124S0X_INPUT_MUX, + chan->channel); + if (ret) { + dev_err(&priv->spi->dev, "Set ADC CH failed\n"); + goto out; + } + + ret = ads124s_write_cmd(indio_dev, ADS124S_START_CONV); + if (ret) { + dev_err(&priv->spi->dev, "Start ADC converions failed\n"); + goto out; + } + + ret = ads124s_read(indio_dev, chan->channel); + if (ret < 0) { + dev_err(&priv->spi->dev, "Read ADC failed\n"); + goto out; + } else + *val = ret; + + ret = ads124s_write_cmd(indio_dev, ADS124S_STOP_CONV); + if (ret) { + dev_err(&priv->spi->dev, "Stop ADC converions failed\n"); + goto out; + } + + mutex_unlock(&priv->lock); + if (ret < 0) + return ret; + + return IIO_VAL_INT; + default: + break; + } +out: + mutex_unlock(&priv->lock); + return -EINVAL; +} + +static const struct iio_info ads124s_info = { + .read_raw = &ads124s_read_raw, +}; + +static irqreturn_t ads124s_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct ads124s_private *priv = iio_priv(indio_dev); + u16 buffer[ADS124S0X_MAX_CHANNELS]; + int i, j = 0; + int ret; + + for (i = 0; i < indio_dev->masklength; i++) { + if (!test_bit(i, indio_dev->active_scan_mask)) + continue; + + ret = ads124s_write_reg(indio_dev, ADS124S0X_INPUT_MUX, i); + if (ret) + dev_err(&priv->spi->dev, "Set ADC CH failed\n"); + + ret = ads124s_write_cmd(indio_dev, ADS124S_START_CONV); + if (ret) + dev_err(&priv->spi->dev, "Start ADC converions failed\n"); + + buffer[j] = ads124s_read(indio_dev, i); + ret = ads124s_write_cmd(indio_dev, ADS124S_STOP_CONV); + if (ret) + dev_err(&priv->spi->dev, "Stop ADC converions failed\n"); + + j++; + } + + iio_push_to_buffers_with_timestamp(indio_dev, buffer, + pf->timestamp); + + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +static int ads124s_probe(struct spi_device *spi) +{ + struct ads124s_private *ads124s_priv; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*ads124s_priv)); + if (indio_dev == NULL) + return -ENOMEM; + + ads124s_priv = iio_priv(indio_dev); + + ads124s_priv->reg = devm_regulator_get_optional(&spi->dev, "vref"); + if (!IS_ERR(ads124s_priv->reg)) { + ret = regulator_enable(ads124s_priv->reg); + if (ret) + return ret; + + ads124s_priv->vref_mv = regulator_get_voltage(ads124s_priv->reg); + if (ads124s_priv->vref_mv <= 0) + goto err_regulator_disable; + } else { + /* Use internal reference */ + ads124s_priv->vref_mv = 0; + } + + ads124s_priv->reset_gpio = devm_gpiod_get_optional(&spi->dev, + "reset", GPIOD_OUT_LOW); + if (IS_ERR(ads124s_priv->reset_gpio)) + dev_info(&spi->dev, "Reset GPIO not defined\n"); + + ads124s_priv->chip_info = &ads124s_chip_info_tbl[spi_get_device_id(spi)->driver_data]; + + spi_set_drvdata(spi, indio_dev); + + ads124s_priv->spi = spi; + + indio_dev->name = spi_get_device_id(spi)->name; + indio_dev->dev.parent = &spi->dev; + indio_dev->dev.of_node = spi->dev.of_node; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = ads124s_priv->chip_info->channels; + indio_dev->num_channels = ads124s_priv->chip_info->num_channels; + indio_dev->info = &ads124s_info; + + mutex_init(&ads124s_priv->lock); + + ret = iio_triggered_buffer_setup(indio_dev, NULL, + ads124s_trigger_handler, NULL); + if (ret < 0) { + dev_err(&spi->dev, "iio triggered buffer setup failed\n"); + goto err_regulator_disable; + } + + ads124s_reset(indio_dev); + + ret = iio_device_register(indio_dev); + if (ret) + goto err_buffer_cleanup; + + return 0; + +err_buffer_cleanup: + iio_triggered_buffer_cleanup(indio_dev); + +err_regulator_disable: + if (!IS_ERR(ads124s_priv->reg)) + regulator_disable(ads124s_priv->reg); + + return ret; +} + +static int ads124s_remove(struct spi_device *spi) +{ + struct iio_dev *indio_dev = spi_get_drvdata(spi); + + iio_device_unregister(indio_dev); + iio_triggered_buffer_cleanup(indio_dev); + + return 0; +} + +static const struct spi_device_id ads124s_id[] = { + { "ads124s08", ADS124S08_ID }, + { "ads124s06", ADS124S06_ID }, + { } +}; +MODULE_DEVICE_TABLE(spi, ads124s_id); + +static const struct of_device_id ads124s_of_table[] = { + { .compatible = "ti,ads124s08" }, + { .compatible = "ti,ads124s06" }, + { }, +}; +MODULE_DEVICE_TABLE(of, ads124s_of_table); + +static struct spi_driver ads124s_driver = { + .driver = { + .name = "ads124s", + .of_match_table = ads124s_of_table, + }, + .probe = ads124s_probe, + .remove = ads124s_remove, + .id_table = ads124s_id, +}; +module_spi_driver(ads124s_driver); + +MODULE_AUTHOR("Dan Murphy "); +MODULE_DESCRIPTION("TI TI_ADS12S0X ADC"); +MODULE_LICENSE("GPL v2");