linux-kernel - Re: [PATCH v2 1/4] iio: adc: Add support for AD7091R5 ADC

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Date:   Tue, 29 Oct 2019 21:59:30 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Beniamin Bia <beniamin.bia@...log.com>
Cc:     jic23@...nel.org, devel@...verdev.osuosl.org, mark.rutland@....com,
        lars@...afoo.de, biabeniamin@...look.com,
        Michael.Hennerich@...log.com, devicetree@...r.kernel.org,
        linux-iio@...r.kernel.org, gregkh@...uxfoundation.org,
        linus.walleij@...aro.org, linux-kernel@...r.kernel.org,
        nicolas.ferre@...rochip.com, robh+dt@...nel.org, pmeerw@...erw.net,
        knaack.h@....de, mchehab+samsung@...nel.org, paulmck@...ux.ibm.com,
        Paul Cercueil <paul.cercueil@...log.com>
Subject: Re: [PATCH v2 1/4] iio: adc: Add support for AD7091R5 ADC

It looks like you're going to have to respin the patchset so I'm adding
my nits even though it's a bit late.


> +static int ad7091r_set_mode(struct ad7091r_state *st, enum ad7091r_mode mode)
> +{
> +	int ret;
> +
> +	switch (mode) {
> +	case AD7091R_MODE_SAMPLE:
> +		ret = regmap_update_bits(st->map, AD7091R_REG_CONF,
> +					 AD7091R_REG_CONF_MODE_MASK, 0);
> +		break;
> +	case AD7091R_MODE_COMMAND:
> +		ret = regmap_update_bits(st->map, AD7091R_REG_CONF,
> +					 AD7091R_REG_CONF_MODE_MASK,
> +					 AD7091R_REG_CONF_CMD);
> +		break;
> +	case AD7091R_MODE_AUTOCYCLE:
> +		ret = regmap_update_bits(st->map, AD7091R_REG_CONF,
> +					 AD7091R_REG_CONF_MODE_MASK,
> +					 AD7091R_REG_CONF_AUTO);
> +		break;
> +	default:
> +		ret = -EINVAL;
> +		break;
> +	}

This would look even better as:

	switch (mode) {
	case AD7091R_MODE_SAMPLE:
		conf = 0;
		break;
	case AD7091R_MODE_COMMAND:
		conf = AD7091R_REG_CONF_CMD;
		break;
	case AD7091R_MODE_AUTOCYCLE:
		conf = AD7091R_REG_CONF_AUTO;
		break;
	default:
		return -EINVAL;
	}

	ret = regmap_update_bits(st->map, AD7091R_REG_CONF,
				 AD7091R_REG_CONF_MODE_MASK, conf);
	if (ret)
		return ret;

	st->mode = mode;

	return 0;

> +int ad7091r_probe(struct device *dev, const char *name,
> +		const struct ad7091r_chip_info *chip_info,
> +		struct regmap *map, int irq)
> +{
> +	struct iio_dev *iio_dev;
> +	struct ad7091r_state *st;
> +	int ret;
> +
> +	iio_dev = devm_iio_device_alloc(dev, sizeof(*st));
> +	if (!iio_dev)
> +		return -ENOMEM;
> +
> +	st = iio_priv(iio_dev);
> +	st->dev = dev;
> +	st->chip_info = chip_info;
> +	st->map = map;
> +
> +	iio_dev->dev.parent = dev;
> +	iio_dev->name = name;
> +	iio_dev->info = &ad7091r_info;
> +	iio_dev->modes = INDIO_DIRECT_MODE;
> +
> +	iio_dev->num_channels = chip_info->num_channels;
> +	iio_dev->channels = chip_info->channels;
> +
> +	if (irq) {
> +		ret = devm_request_threaded_irq(dev, irq, NULL,
> +				ad7091r_event_handler,
> +				IRQF_TRIGGER_FALLING | IRQF_ONESHOT, name, st);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	/* Use command mode by default to convert only desired channels*/
> +	ret = ad7091r_set_mode(st, AD7091R_MODE_COMMAND);
> +	if (ret < 0)

if (ret) {

> +		return ret;
> +
> +	return iio_device_register(iio_dev);
> +}
> +EXPORT_SYMBOL_GPL(ad7091r_probe);

[ snip ]

> +#include <linux/i2c.h>
> +#include <linux/iio/iio.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +
> +#include "ad7091r-base.h"
> +
> +static const struct iio_event_spec ad7091r5_events[] = {
> +	{
> +		.type = IIO_EV_TYPE_THRESH,
> +		.dir = IIO_EV_DIR_RISING,
> +		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
> +			BIT(IIO_EV_INFO_ENABLE),

This would be more clear if it were aligned like so:

		.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),

		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
				 BIT(IIO_EV_INFO_ENABLE),

> +	},
> +	{
> +		.type = IIO_EV_TYPE_THRESH,
> +		.dir = IIO_EV_DIR_EITHER,
> +		.mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
> +	},
> +};
> +

regards,
dan carpenter