From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 59E6BC47404 for ; Wed, 9 Oct 2019 10:25:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 117AA20659 for ; Wed, 9 Oct 2019 10:25:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="OvrtUu/x" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729761AbfJIKZy (ORCPT ); Wed, 9 Oct 2019 06:25:54 -0400 Received: from mail-pf1-f196.google.com ([209.85.210.196]:40344 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726579AbfJIKZx (ORCPT ); Wed, 9 Oct 2019 06:25:53 -0400 Received: by mail-pf1-f196.google.com with SMTP id x127so1336775pfb.7 for ; Wed, 09 Oct 2019 03:25:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=+7M+41q41/40yUKCsuRLWefaRCtYYSSqHcLObyMwLZQ=; b=OvrtUu/xKz3SU1TzTUP6jdwAXuiFzQRlYdwnqzJ/xXUWgZat4y8eUtztGT6fDFi2Y8 PlT94MPwbpCPie9TdVmBxelbwXa/fsH8/mYcKcv/HEUmB9GTYEZJOQdJULSN9cVeHSg8 Bx1fKvIh+uAyAYiUSETLXlbY4wzojWQnUCxgZvgVvRHrSLt5zka3e/Z/+XutuI/o0kWg eoUP9wMzp3XPuqUjueDKzHnvjlNqyBbn4CFGfsW/+cokEgcCs6yy6+UqJCPbChhY2MHW BRX1XPFWEMFhsrx38SNX06/rGPQ83ZE6CioR1EU9gTbjqvlLpvoUr3qst7AmIMhlmJFF 2jHw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=+7M+41q41/40yUKCsuRLWefaRCtYYSSqHcLObyMwLZQ=; b=uito3iKrFFvjJZYtNGq0NnUjCx/2ybIHaLDvdLhxWWglse6mq8B4tKMRI+z9cxbmwO YXNQuNcS/uaADftBQREAugEOoSIchxv9WLFTJ2eugoxWtyzLuGHEmFSi8Dij6S7d9t6A qTGHBJnvZhCEWuJ6Yx+4ikgFlGOAXqzOvS1ZfzRlxszQ/Ha4nsNb5twJ6/OKVKt3vfem 90jqhOqdFFbFw41mUqbWGHKM9bnY4w8kZZ3sSo3E5mup0BSQlUiAfDjX3p8kdKRCgddm WPav6DkF4jNaUvQAv66b1L5f5nPW2OQW2kGp6XNjzSG5eX5vcPjow49Xw63Deen2LLND M7kw== X-Gm-Message-State: APjAAAURWjxt2gyhBFzKdf++IIiz+l1vKDsgItxo3BhjWFzEVtqkWbtW WvE5y84Hk+YC5fhhLY+z0j5P X-Google-Smtp-Source: APXvYqwnACG1JzUsGdeW+91FBgTCvs1tijh7ZgEqF+H6bxX3Vs5rLQk1ubudIWXnb7NxIk5KcBYNEA== X-Received: by 2002:a17:90a:2ec1:: with SMTP id h1mr3171334pjs.96.1570616750443; Wed, 09 Oct 2019 03:25:50 -0700 (PDT) Received: from Mani-XPS-13-9360 ([103.59.132.163]) by smtp.gmail.com with ESMTPSA id l21sm2718978pgm.55.2019.10.09.03.25.45 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 09 Oct 2019 03:25:49 -0700 (PDT) Date: Wed, 9 Oct 2019 15:55:41 +0530 From: Manivannan Sadhasivam To: Jonathan Cameron Cc: ars@metafoo.de, Michael.Hennerich@analog.com, jic23@kernel.org, knaack.h@gmx.de, pmeerw@pmeerw.net, robh+dt@kernel.org, alexandru.Ardelean@analog.com, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 2/2] iio: light: Add support for ADUX1020 sensor Message-ID: <20191009102541.GB17962@Mani-XPS-13-9360> References: <20191007153917.13611-1-manivannan.sadhasivam@linaro.org> <20191007153917.13611-3-manivannan.sadhasivam@linaro.org> <20191008132744.000047cb@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191008132744.000047cb@huawei.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Hi Jonathan, Thanks for the review! On Tue, Oct 08, 2019 at 01:27:44PM +0100, Jonathan Cameron wrote: > On Mon, 7 Oct 2019 21:09:17 +0530 > Manivannan Sadhasivam wrote: > > > Add initial support for Analog Devices ADUX1020 Photometric sensor. > > Only proximity mode has been enabled for now. > > > > Signed-off-by: Manivannan Sadhasivam > > Hi Manivannan, > > Various minor comments inline. > > Thanks, > > Jonathan > > > --- > > drivers/iio/light/Kconfig | 11 + > > drivers/iio/light/Makefile | 1 + > > drivers/iio/light/adux1020.c | 783 +++++++++++++++++++++++++++++++++++ > > 3 files changed, 795 insertions(+) > > create mode 100644 drivers/iio/light/adux1020.c > > > > diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig > > index 08d7e1ef2186..3f8c8689cd89 100644 > > --- a/drivers/iio/light/Kconfig > > +++ b/drivers/iio/light/Kconfig > > @@ -32,6 +32,17 @@ config ADJD_S311 > > This driver can also be built as a module. If so, the module > > will be called adjd_s311. > > > > +config ADUX1020 > > + tristate "ADUX1020 photometric sensor" > > + select REGMAP_I2C > > + depends on I2C > > + help > > + Say Y here if you want to build a driver for the Analog Devices > > + ADUX1020 photometric sensor. > > + > > + To compile this driver as a module, choose M here: the > > + module will be called adux1020. > > + > > config AL3320A > > tristate "AL3320A ambient light sensor" > > depends on I2C > > diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile > > index 00d1f9b98f39..5d650ce46a40 100644 > > --- a/drivers/iio/light/Makefile > > +++ b/drivers/iio/light/Makefile > > @@ -6,6 +6,7 @@ > > # When adding new entries keep the list in alphabetical order > > obj-$(CONFIG_ACPI_ALS) += acpi-als.o > > obj-$(CONFIG_ADJD_S311) += adjd_s311.o > > +obj-$(CONFIG_ADUX1020) += adux1020.o > > obj-$(CONFIG_AL3320A) += al3320a.o > > obj-$(CONFIG_APDS9300) += apds9300.o > > obj-$(CONFIG_APDS9960) += apds9960.o > > diff --git a/drivers/iio/light/adux1020.c b/drivers/iio/light/adux1020.c > > new file mode 100644 > > index 000000000000..d0b76e5b44f1 > > --- /dev/null > > +++ b/drivers/iio/light/adux1020.c > > @@ -0,0 +1,783 @@ > > +// SPDX-License-Identifier: GPL-2.0+ > > +/* > > + * adux1020.c - Support for Analog Devices ADUX1020 photometric sensor > > + * > > + * Copyright (C) 2019 Linaro Ltd. > > + * Author: Manivannan Sadhasivam > > + * > > + * TODO: Triggered buffer support > > + */ > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +#include > > +#include > > +#include > > + > > +#define ADUX1020_REGMAP_NAME "adux1020_regmap" > > +#define ADUX1020_DRV_NAME "adux1020" > > + > > +/* System registers */ > > +#define ADUX1020_REG_CHIP_ID 0x08 > > +#define ADUX1020_REG_SLAVE_ADDRESS 0x09 > > + > > +#define ADUX1020_REG_SW_RESET 0x0f > > +#define ADUX1020_REG_INT_ENABLE 0x1c > > +#define ADUX1020_REG_INT_POLARITY 0x1d > > +#define ADUX1020_REG_PROX_TH_ON1 0x2a > > +#define ADUX1020_REG_PROX_TH_OFF1 0x2b > > +#define ADUX1020_REG_PROX_TYPE 0x2f > > +#define ADUX1020_REG_TEST_MODES_3 0x32 > > +#define ADUX1020_REG_FORCE_MODE 0x33 > > +#define ADUX1020_REG_FREQUENCY 0x40 > > +#define ADUX1020_REG_LED_CURRENT 0x41 > > +#define ADUX1020_REG_OP_MODE 0x45 > > +#define ADUX1020_REG_INT_MASK 0x48 > > +#define ADUX1020_REG_INT_STATUS 0x49 > > +#define ADUX1020_REG_DATA_BUFFER 0x60 > > + > > +/* Chip ID bits */ > > +#define ADUX1020_CHIP_ID_MASK GENMASK(11, 0) > > +#define ADUX1020_CHIP_ID 0x03fc > > + > > +#define ADUX1020_MODE_OUT_SHIFT 4 > > +#define ADUX1020_MODE_OUT_PROX_I 1 > > +#define ADUX1020_MODE_OUT_PROX_XY 3 > > + > > +#define ADUX1020_SW_RESET BIT(1) > > +#define ADUX1020_FIFO_FLUSH BIT(15) > > +#define ADUX1020_OP_MODE_MASK GENMASK(3, 0) > > +#define ADUX1020_DATA_OUT_MODE_MASK GENMASK(7, 4) > > + > > +#define ADUX1020_MODE_INT_MASK GENMASK(7, 0) > > +#define ADUX1020_INT_ENABLE 0x2096 > > +#define ADUX1020_INT_DISABLE 0x2090 > > +#define ADUX1020_PROX_INT_ENABLE 0x00f0 > > +#define ADUX1020_PROX_ON1_INT BIT(0) > > +#define ADUX1020_PROX_OFF1_INT BIT(1) > > +#define ADUX1020_FIFO_INT_ENABLE 0x7f > > +#define ADUX1020_MODE_INT_DISABLE 0xff > > +#define ADUX1020_MODE_INT_STATUS_MASK GENMASK(7, 0) > > +#define ADUX1020_FIFO_STATUS_MASK GENMASK(15, 8) > > +#define ADUX1020_PROX_TYPE BIT(15) > > + > > +#define ADUX1020_INT_PROX_ON1 BIT(0) > > +#define ADUX1020_INT_PROX_OFF1 BIT(1) > > + > > +#define ADUX1020_FORCE_CLOCK_ON 0x0f4f > > +#define ADUX1020_FORCE_CLOCK_RESET 0x0040 > > +#define ADUX1020_ACTIVE_4_STATE 0x0008 > > + > > +#define ADUX1020_PROX_FREQ_MASK GENMASK(7, 4) > > +#define ADUX1020_PROX_FREQ_SHIFT 4 > > + > > +#define ADUX1020_LED_CURRENT_MASK GENMASK(3, 0) > > +#define ADUX1020_LED_PIREF_EN BIT(12) > > + > > +/* Operating modes */ > > +enum adux1020_op_modes { > > + ADUX1020_MODE_STANDBY, > > + ADUX1020_MODE_PROX_I, > > + ADUX1020_MODE_PROX_XY, > > + ADUX1020_MODE_GEST, > > + ADUX1020_MODE_SAMPLE, > > + ADUX1020_MODE_FORCE = 0x0e, > > + ADUX1020_MODE_IDLE = 0x0f, > > +}; > > + > > +struct adux1020_data { > > + struct i2c_client *client; > > + struct iio_dev *indio_dev; > > + struct mutex lock; > > + struct regmap *regmap; > > +}; > > + > > +struct adux1020_mode_data { > > + u8 bytes; > > + u8 buf_len; > > + u16 int_en; > > +}; > > + > > +static const struct adux1020_mode_data adux1020_modes[] = { > > + [ADUX1020_MODE_PROX_I] = { > > + .bytes = 2, > > + .buf_len = 1, > > + .int_en = ADUX1020_PROX_INT_ENABLE, > > + }, > > +}; > > + > > +static const struct regmap_config adux1020_regmap_config = { > > + .name = ADUX1020_REGMAP_NAME, > > + .reg_bits = 8, > > + .val_bits = 16, > > + .max_register = 0x6F, > > + .cache_type = REGCACHE_NONE, > > +}; > > + > > +static const int adux1020_def_conf[][2] = { > > + { 0x000c, 0x000f }, > > + { 0x0010, 0x1010 }, > > + { 0x0011, 0x004c }, > > + { 0x0012, 0x5f0c }, > > + { 0x0013, 0xada5 }, > > + { 0x0014, 0x0080 }, > > + { 0x0015, 0x0000 }, > > + { 0x0016, 0x0600 }, > > + { 0x0017, 0x0000 }, > > + { 0x0018, 0x2693 }, > > + { 0x0019, 0x0004 }, > > + { 0x001a, 0x4280 }, > > + { 0x001b, 0x0060 }, > > + { 0x001c, 0x2094 }, > > + { 0x001d, 0x0020 }, > > + { 0x001e, 0x0001 }, > > + { 0x001f, 0x0100 }, > > + { 0x0020, 0x0320 }, > > + { 0x0021, 0x0A13 }, > > + { 0x0022, 0x0320 }, > > + { 0x0023, 0x0113 }, > > + { 0x0024, 0x0000 }, > > + { 0x0025, 0x2412 }, > > + { 0x0026, 0x2412 }, > > + { 0x0027, 0x0022 }, > > + { 0x0028, 0x0000 }, > > + { 0x0029, 0x0300 }, > > + { 0x002a, 0x0700 }, > > + { 0x002b, 0x0600 }, > > + { 0x002c, 0x6000 }, > > + { 0x002d, 0x4000 }, > > + { 0x002e, 0x0000 }, > > + { 0x002f, 0x0000 }, > > + { 0x0030, 0x0000 }, > > + { 0x0031, 0x0000 }, > > + { 0x0032, 0x0040 }, > > + { 0x0033, 0x0008 }, > > + { 0x0034, 0xE400 }, > > + { 0x0038, 0x8080 }, > > + { 0x0039, 0x8080 }, > > + { 0x003a, 0x2000 }, > > + { 0x003b, 0x1f00 }, > > + { 0x003c, 0x2000 }, > > + { 0x003d, 0x2000 }, > > + { 0x003e, 0x0000 }, > > + { 0x0040, 0x8069 }, > > + { 0x0041, 0x1f2f }, > > + { 0x0042, 0x4000 }, > > + { 0x0043, 0x0000 }, > > + { 0x0044, 0x0008 }, > > + { 0x0046, 0x0000 }, > > + { 0x0048, 0x00ef }, > > + { 0x0049, 0x0000 }, > > + { 0x0045, 0x0000 }, > > +}; > > + > > +static const int adux1020_rate[][2] = { > > + { 0, 100000 }, > > + { 0, 200000 }, > > + { 0, 500000 }, > > + { 1, 0 }, > > + { 2, 0 }, > > + { 5, 0 }, > > + { 10, 0 }, > > + { 20, 0 }, > > + { 50, 0 }, > > + { 100, 0 }, > > + { 190, 0 }, > > + { 450, 0 }, > > + { 820, 0 }, > > + { 1400, 0 }, > > +}; > > + > > +static const int adux1020_led_current[][2] = { > > + { 0, 25000 }, > > + { 0, 40000 }, > > + { 0, 55000 }, > > + { 0, 70000 }, > > + { 0, 85000 }, > > + { 0, 100000 }, > > + { 0, 115000 }, > > + { 0, 130000 }, > > + { 0, 145000 }, > > + { 0, 160000 }, > > + { 0, 175000 }, > > + { 0, 190000 }, > > + { 0, 205000 }, > > + { 0, 220000 }, > > + { 0, 235000 }, > > + { 0, 250000 }, > > +}; > > + > > +static void adux1020_flush_fifo(struct adux1020_data *data) > > +{ > > + /* Force Idle mode */ > > + regmap_write(data->regmap, ADUX1020_REG_FORCE_MODE, > > + ADUX1020_ACTIVE_4_STATE); > > + regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, > > + ADUX1020_OP_MODE_MASK, ADUX1020_MODE_FORCE); > > + regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, > > + ADUX1020_OP_MODE_MASK, ADUX1020_MODE_IDLE); > > + > > + /* Flush FIFO */ > > + regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, > > + ADUX1020_FORCE_CLOCK_ON); > > + regmap_write(data->regmap, ADUX1020_REG_INT_STATUS, > > + ADUX1020_FIFO_FLUSH); > > + regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, > > + ADUX1020_FORCE_CLOCK_RESET); > > +} > > + > > +static int adux1020_read_fifo(struct adux1020_data *data, u16 *buf, u8 buf_len) > > +{ > > + int i, ret = -EINVAL; > > + unsigned int regval; > > + > > + /* Enable 32MHz clock */ > > + regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, > > + ADUX1020_FORCE_CLOCK_ON); > > + > > + for (i = 0; i < buf_len; i++) { > > + ret = regmap_read(data->regmap, ADUX1020_REG_DATA_BUFFER, > > + ®val); > > + if (ret < 0) > > + goto err_out; > > + > > + buf[i] = regval; > > + } > > + > > + /* Set 32MHz clock to be controlled by internal state machine */ > > + regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, > > + ADUX1020_FORCE_CLOCK_RESET); > > + > > +err_out: > > + return ret; > > +} > > + > > +static void adux1020_set_mode(struct adux1020_data *data, > > + enum adux1020_op_modes mode) > > +{ > > + /* Switch to standby mode before changing the mode */ > > + regmap_write(data->regmap, ADUX1020_REG_OP_MODE, ADUX1020_MODE_STANDBY); > > + > > + /* Set data out and switch to the desired mode */ > > + if (mode == ADUX1020_MODE_PROX_I) { > > + regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, > > + ADUX1020_DATA_OUT_MODE_MASK, > > + ADUX1020_MODE_OUT_PROX_I << ADUX1020_MODE_OUT_SHIFT); > > + regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, > > + ADUX1020_OP_MODE_MASK, ADUX1020_MODE_PROX_I); > > + } > > +} > > + > > +static int adux1020_measure(struct adux1020_data *data, > > + enum adux1020_op_modes mode, > > + u16 *val) > > +{ > > + int ret, tries = 50; > > + unsigned int status; > > + > > + mutex_lock(&data->lock); > > + > > + /* Disable INT pin as polling is going to be used */ > > + regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE, > > + ADUX1020_INT_DISABLE); > Error checking. Yes, will add error check to regmap_ APIs wherever required. > > + > > + /* Enable mode interrupt */ > > + regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, > > + ADUX1020_MODE_INT_MASK, > > + adux1020_modes[mode].int_en); > > + > > + while (tries--) { > > + ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS, > > + &status); > > + if (ret < 0) > > + goto fail; > > + > > + status &= ADUX1020_FIFO_STATUS_MASK; > > + if (status >= adux1020_modes[mode].bytes) > > + break; > > + msleep(20); > > + } > > + > > + if (tries < 0) { > > + ret = -EIO; > > + goto fail; > > + } > > + > > + ret = adux1020_read_fifo(data, val, adux1020_modes[mode].buf_len); > > + if (ret < 0) > > + goto fail; > > + > > + /* Clear mode interrupt */ > > + regmap_write(data->regmap, ADUX1020_REG_INT_STATUS, > > + (~adux1020_modes[mode].int_en)); > > + /* Disable mode interrupts */ > > + regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, > > + ADUX1020_MODE_INT_MASK, ADUX1020_MODE_INT_DISABLE); > > + > > +fail: > > + mutex_unlock(&data->lock); > > + > > + return ret; > > +} > > + > > +static int adux1020_read_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, > > + int *val, int *val2, long mask) > > +{ > > + struct adux1020_data *data = iio_priv(indio_dev); > > + u16 buf[3]; > > + int ret = -EINVAL; > > + unsigned int regval; > > + > > + switch (mask) { > > + case IIO_CHAN_INFO_RAW: > > + switch (chan->type) { > > + case IIO_PROXIMITY: > > + adux1020_set_mode(data, ADUX1020_MODE_PROX_I); > > + ret = adux1020_measure(data, ADUX1020_MODE_PROX_I, buf); > > + if (ret < 0) > > + return ret; > > + > > + *val = buf[0]; > > + ret = IIO_VAL_INT; > return IIO_VAL_INT; > > + break; > > + default: > return -EINVAL; > > + break; > > + } > > + break; > > + case IIO_CHAN_INFO_PROCESSED: > > + switch (chan->type) { > > + case IIO_CURRENT: > > + ret = regmap_read(data->regmap, > > + ADUX1020_REG_LED_CURRENT, ®val); > > + if (ret < 0) > > + return ret; > > + > > + regval = regval & ADUX1020_LED_CURRENT_MASK; > > + > > + *val = adux1020_led_current[regval][0]; > > + *val2 = adux1020_led_current[regval][1]; > > + > > + ret = IIO_VAL_INT_PLUS_MICRO; > > + break; > > + default: > > + break; > > + } > > + break; > > + case IIO_CHAN_INFO_SAMP_FREQ: > > + switch (chan->type) { > > + case IIO_PROXIMITY: > > + ret = regmap_read(data->regmap, ADUX1020_REG_FREQUENCY, > > + ®val); > > + if (ret < 0) > > + return ret; > > + > > + regval = (regval & ADUX1020_PROX_FREQ_MASK) >> > > + ADUX1020_PROX_FREQ_SHIFT; > > + > > + *val = adux1020_rate[regval][0]; > > + *val2 = adux1020_rate[regval][1]; > > + > > + ret = IIO_VAL_INT_PLUS_MICRO; > > + break; > > + default: > > + break; > > + } > > + break; > > + default: > > + break; > > + } > > + > > + return ret; > > +}; > > + > > +static int adux1020_write_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, > > + int val, int val2, long mask) > > +{ > > + struct adux1020_data *data = iio_priv(indio_dev); > > + int i, ret = -EINVAL; > > + > > + switch (mask) { > > + case IIO_CHAN_INFO_SAMP_FREQ: > > + if (chan->type == IIO_PROXIMITY) { > Indent is very deep. I would suggest flipping conditions a bit. > > if (chan->type != IIO_PROXIMITY) > return -EINVAL; > > for (i = 0; i < ARRAY_SIZE(adux1020_rate); i++) { > if ((val != adux1020_rate[i][0]) || > (val2 != adux1020_rate[i][1])) > continue; > return regmap_update_bits(data->regmap, > ADUX1020_REG_FREQUENCY, > ADUX1020_PROX_FREQ_MASK, > i << ADUX1020_PROX_FREQ_SHIFT); > > } > return -EINVAL; This code will be modified to use a helper for finding the index. Then it will look more cleaner. > > > + for (i = 0; i < ARRAY_SIZE(adux1020_rate); i++) { > > + if ((val == adux1020_rate[i][0]) && > > + (val2 == adux1020_rate[i][1])) { > > + ret = regmap_update_bits(data->regmap, > > + ADUX1020_REG_FREQUENCY, > > + ADUX1020_PROX_FREQ_MASK, > > + i << ADUX1020_PROX_FREQ_SHIFT); > > + } > > + } > > + } > > + break; > > direct return preferred if there is no cleanup to be done (like here). > > > + case IIO_CHAN_INFO_PROCESSED: > > + if (chan->type == IIO_CURRENT) { > > + for (i = 0; i < ARRAY_SIZE(adux1020_led_current); i++) { > > + if ((val == adux1020_led_current[i][0]) && > > + (val2 == adux1020_led_current[i][1])) { > > + ret = regmap_update_bits(data->regmap, > > + ADUX1020_REG_LED_CURRENT, > > + ADUX1020_LED_CURRENT_MASK, i); > > + } > > + } > > + } > > + break; > > + default: > > + break; > > + } > > + > > + return ret; > > +} > > + > > +static int adux1020_write_event_config(struct iio_dev *indio_dev, > > + const struct iio_chan_spec *chan, enum iio_event_type type, > > + enum iio_event_direction dir, int state) > > +{ > > + struct adux1020_data *data = iio_priv(indio_dev); > > + > > + regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE, > > + ADUX1020_INT_ENABLE); > > Check returns from regmap everywhere. I've had far too many dodgy > i2c buses in the past to assume they will always work! > > > + > > + regmap_write(data->regmap, ADUX1020_REG_INT_POLARITY, 0); > > + > > + switch (chan->type) { > > + case IIO_PROXIMITY: > > + if (dir == IIO_EV_DIR_RISING) { > > + regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, > > + ADUX1020_PROX_ON1_INT, > > + state ? 0 : ADUX1020_PROX_ON1_INT); > > + } else { > > + regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, > > + ADUX1020_PROX_OFF1_INT, > > + state ? 0 : ADUX1020_PROX_OFF1_INT); > > + } > > + > > + /* > > + * Trigger proximity interrupt when the intensity is above > > + * or below threshold > > + */ > > + regmap_update_bits(data->regmap, ADUX1020_REG_PROX_TYPE, > > + ADUX1020_PROX_TYPE, ADUX1020_PROX_TYPE); > > + > > + /* Set proximity mode */ > > + adux1020_set_mode(data, ADUX1020_MODE_PROX_I); > > + break; > > + default: > > + return -EINVAL; > > + } > > + > > + return 0; > > +} > > + > > +static int adux1020_read_event_config(struct iio_dev *indio_dev, > > + const struct iio_chan_spec *chan, enum iio_event_type type, > > + enum iio_event_direction dir) > > +{ > > + struct adux1020_data *data = iio_priv(indio_dev); > > + int ret, mask; > > + unsigned int regval; > > + > > + switch (chan->type) { > > + case IIO_PROXIMITY: > > + if (dir == IIO_EV_DIR_RISING) > > + mask = ADUX1020_PROX_ON1_INT; > > + else > > + mask = ADUX1020_PROX_OFF1_INT; > > + break; > > + default: > > + return -EINVAL; > > + } > > + > > + ret = regmap_read(data->regmap, ADUX1020_REG_INT_MASK, ®val); > > + if (ret < 0) > > + return ret; > > + > > + return !(regval & mask); > > +} > > + > > +static int adux1020_read_thresh(struct iio_dev *indio_dev, > > + const struct iio_chan_spec *chan, enum iio_event_type type, > > + enum iio_event_direction dir, enum iio_event_info info, > > + int *val, int *val2) > > +{ > > + struct adux1020_data *data = iio_priv(indio_dev); > > + u8 reg; > > + int ret; > > + unsigned int regval; > > + > > + switch (chan->type) { > > + case IIO_PROXIMITY: > > + if (dir == IIO_EV_DIR_RISING) > > + reg = ADUX1020_REG_PROX_TH_ON1; > > + else > > + reg = ADUX1020_REG_PROX_TH_OFF1; > > + break; > > + default: > > + return -EINVAL; > > + } > > + > > + ret = regmap_read(data->regmap, reg, ®val); > > + if (ret < 0) > > + return ret; > > + > > + *val = regval; > > + > > + return IIO_VAL_INT; > > +} > > + > > +static int adux1020_write_thresh(struct iio_dev *indio_dev, > > + const struct iio_chan_spec *chan, enum iio_event_type type, > > + enum iio_event_direction dir, enum iio_event_info info, > > + int val, int val2) > > +{ > > + struct adux1020_data *data = iio_priv(indio_dev); > > + u8 reg; > > + > > + switch (chan->type) { > > + case IIO_PROXIMITY: > > + if (dir == IIO_EV_DIR_RISING) > > + reg = ADUX1020_REG_PROX_TH_ON1; > > + else > > + reg = ADUX1020_REG_PROX_TH_OFF1; > > + break; > > + default: > > + return -EINVAL; > > + } > > + > > + /* Full scale threshold value is 0-65535 */ > > + if (val < 0 || val > 65535) > > + return -EINVAL; > > + > > + return regmap_write(data->regmap, reg, val); > > +} > > + > > +static const struct iio_event_spec adux1020_proximity_event[] = { > > + { > > + .type = IIO_EV_TYPE_THRESH, > > + .dir = IIO_EV_DIR_RISING, > > + .mask_separate = BIT(IIO_EV_INFO_VALUE) | > > + BIT(IIO_EV_INFO_ENABLE), > > + }, > > + { > > + .type = IIO_EV_TYPE_THRESH, > > + .dir = IIO_EV_DIR_FALLING, > > + .mask_separate = BIT(IIO_EV_INFO_VALUE) | > > + BIT(IIO_EV_INFO_ENABLE), > > + }, > > +}; > > + > > +static const struct iio_chan_spec adux1020_channels[] = { > > + { > > + .type = IIO_PROXIMITY, > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > > + BIT(IIO_CHAN_INFO_SAMP_FREQ), > > + .event_spec = adux1020_proximity_event, > > + .num_event_specs = ARRAY_SIZE(adux1020_proximity_event), > > + }, > > + { > > + .type = IIO_CURRENT, > > + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), > > + .extend_name = "led", > > out channel? > If I add `out channel`, the sysfs naming gets wierd (out_current_led_input). Do you have a suggestion on how to represent it properly? This channel is used for getting the LED driver current and the value is in mA. > > + }, > > +}; > > + > > +static IIO_CONST_ATTR(sampling_frequency_available, > > + "0.1 0.2 0.5 1 2 5 10 20 50 100 190 450 820 1400"); > > + > > +static struct attribute *adux1020_attributes[] = { > > + &iio_const_attr_sampling_frequency_available.dev_attr.attr, > > + NULL > > +}; > > + > > +static const struct attribute_group adux1020_attribute_group = { > > + .attrs = adux1020_attributes, > > +}; > > + > > +static const struct iio_info adux1020_info = { > > + .attrs = &adux1020_attribute_group, > > + .read_raw = adux1020_read_raw, > > + .write_raw = adux1020_write_raw, > > + .read_event_config = adux1020_read_event_config, > > + .write_event_config = adux1020_write_event_config, > > + .read_event_value = adux1020_read_thresh, > > + .write_event_value = adux1020_write_thresh, > > +}; > > + > > +static irqreturn_t adux1020_interrupt_handler(int irq, void *private) > > +{ > > + struct iio_dev *indio_dev = private; > > + struct adux1020_data *data = iio_priv(indio_dev); > > + int ret, status; > > + > > + ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS, &status); > > + if (ret < 0) > > interrupt handlers have to return an irqreturn_t, so you can't just > return random error codes. > ah, yes. > > + return ret; > > + > > + status &= ADUX1020_MODE_INT_STATUS_MASK; > > + > > + if (status & ADUX1020_INT_PROX_ON1) { > > + iio_push_event(indio_dev, > > + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0, > > + IIO_EV_TYPE_THRESH, > > + IIO_EV_DIR_RISING), > > + iio_get_time_ns(indio_dev)); > > + } > > + > > + if (status & ADUX1020_INT_PROX_OFF1) { > > + iio_push_event(indio_dev, > > + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0, > > + IIO_EV_TYPE_THRESH, > > + IIO_EV_DIR_FALLING), > > + iio_get_time_ns(indio_dev)); > > + } > > + > > + regmap_update_bits(data->regmap, ADUX1020_REG_INT_STATUS, > > + ADUX1020_MODE_INT_MASK, status); > > + > > + return IRQ_HANDLED; > > +} > > + > > +static int adux1020_chip_init(struct adux1020_data *data) > > +{ > > + struct i2c_client *client = data->client; > > + int ret, i; > > + unsigned int val; > > + > > + ret = regmap_read(data->regmap, ADUX1020_REG_CHIP_ID, &val); > > + if (ret < 0) > > + return ret; > > + > > + val &= ADUX1020_CHIP_ID_MASK; > > + > > + if (val != ADUX1020_CHIP_ID) { > as val is only used here, > > if (val & ADUX1020_CHIP_ID_MASK != ADUX1020_CHIP_ID) { > > Saves a bit of code and isn't significantly harder to read. > okay. > > + dev_err(&client->dev, "invalid chip id 0x%04x\n", val); > > + return -ENODEV; > > + }; > > + > > + dev_dbg(&client->dev, "Detected ADUX1020 with chip id: 0x%04x\n", val); > > + > > + /* Perform software reset */ > > Try to avoid comments where the code is fairly self explanatory. > They are just potential places to diverge from reality in the future ;) > okay. > > + regmap_update_bits(data->regmap, ADUX1020_REG_SW_RESET, > > + ADUX1020_SW_RESET, ADUX1020_SW_RESET); > > This is i2c so not exactly 100% reliable (depends on good board > design etc). Hence I'd add error checking for all these reads and > writes. > > > + > > + /* Load default configuration */ > > + for (i = 0; i < ARRAY_SIZE(adux1020_def_conf); i++) > > + regmap_write(data->regmap, adux1020_def_conf[i][0], > > + adux1020_def_conf[i][1]); > > + > > + adux1020_flush_fifo(data); > > + > > + /* Use LED_IREF for proximity mode */ > > + regmap_update_bits(data->regmap, ADUX1020_REG_LED_CURRENT, > > + ADUX1020_LED_PIREF_EN, 0); > > + > > + /* Mask all interrupts */ > > + regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, > > + ADUX1020_MODE_INT_MASK, ADUX1020_MODE_INT_DISABLE); > > + > > + return 0; > > +} > > + > > +static int adux1020_probe(struct i2c_client *client, > > + const struct i2c_device_id *id) > > +{ > > + struct adux1020_data *data; > > + struct iio_dev *indio_dev; > > + int ret; > > + > > + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); > > + if (!indio_dev) > > + return -ENOMEM; > > + > > + indio_dev->dev.parent = &client->dev; > > + indio_dev->info = &adux1020_info; > > + indio_dev->name = ADUX1020_DRV_NAME; > > + indio_dev->channels = adux1020_channels; > > + indio_dev->num_channels = ARRAY_SIZE(adux1020_channels); > > + indio_dev->modes = INDIO_DIRECT_MODE; > > + > > + data = iio_priv(indio_dev); > > + i2c_set_clientdata(client, indio_dev); > > + > > + data->regmap = devm_regmap_init_i2c(client, &adux1020_regmap_config); > > + if (IS_ERR(data->regmap)) { > > + dev_err(&client->dev, "regmap initialization failed.\n"); > > + return PTR_ERR(data->regmap); > > + } > > + > > + data->client = client; > > + data->indio_dev = indio_dev; > > + mutex_init(&data->lock); > > + > > + ret = adux1020_chip_init(data); > > + if (ret) > > return ret; > > > + goto err_out; > > + > > + if (client->irq) { > > + ret = devm_request_threaded_irq(&client->dev, client->irq, > > + NULL, adux1020_interrupt_handler, > > + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, > > + ADUX1020_DRV_NAME, indio_dev); > > + if (ret) { > > + dev_err(&client->dev, "irq request error %d\n", -ret); > > + goto err_out; > > Direct returns are preferred in kernel code as they are generally easier > to review. No need to check the error handling if we immediately know > there isn't any to be done! > > return ret; ack. > > + } > > + } > > + > > + ret = iio_device_register(indio_dev); > > + if (ret) { > > + dev_err(&client->dev, "Failed to register IIO device\n"); > > + goto err_out; > > This error path does no error handling so you can return directly here. > return ret; > > But... Then there is no point in having the return here as you might > as well drop it out of the brackets and replace the return 0 below with > return ret; ack. > > > + } > > + > > + return 0; > > + > > +err_out: > > + return ret; > > +} > > + > > +static int adux1020_remove(struct i2c_client *client) > > +{ > > + struct iio_dev *indio_dev = i2c_get_clientdata(client); > > + > > + iio_device_unregister(indio_dev); > If we have a remove with only iio_device_unregister it normally > implies we could have used devm_iio_device_register and allowed > the automatic unwinding to do it for us. > > Make that change and you shouldn't need a remove function at all. > In turn, there is no reason to then call i2c_set_clientdata() Sure, will use devm_ API. Thanks, Mani > > > + > > + return 0; > > +} > > + > > +static const struct i2c_device_id adux1020_id[] = { > > + { "adux1020", 0 }, > > + {} > > +}; > > +MODULE_DEVICE_TABLE(i2c, adux1020_id); > > + > > +static const struct of_device_id adux1020_of_match[] = { > > + { .compatible = "adi,adux1020" }, > > + { } > > +}; > > +MODULE_DEVICE_TABLE(of, adux1020_of_match); > > + > > +static struct i2c_driver adux1020_driver = { > > + .driver = { > > + .name = ADUX1020_DRV_NAME, > > + .of_match_table = adux1020_of_match, > > + }, > > + .probe = adux1020_probe, > > + .remove = adux1020_remove, > > + .id_table = adux1020_id, > > +}; > > +module_i2c_driver(adux1020_driver); > > + > > +MODULE_AUTHOR("Manivannan Sadhasivam "); > > +MODULE_DESCRIPTION("ADUX1020 photometric sensor"); > > +MODULE_LICENSE("GPL"); > >