linux-kernel - Re: [PATCH 6/7] hwmon: iio: Add min/max support

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Message-ID: <aHYUOs25SrUb4BtD@smile.fi.intel.com>
Date: Tue, 15 Jul 2025 11:41:30 +0300
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Sean Anderson <sean.anderson@...ux.dev>
Cc: Jonathan Cameron <jic23@...nel.org>, Jean Delvare <jdelvare@...e.com>,
	Guenter Roeck <linux@...ck-us.net>, linux-iio@...r.kernel.org,
	linux-hwmon@...r.kernel.org, Andy Shevchenko <andy@...nel.org>,
	Nuno Sá <nuno.sa@...log.com>,
	linux-kernel@...r.kernel.org, David Lechner <dlechner@...libre.com>
Subject: Re: [PATCH 6/7] hwmon: iio: Add min/max support

On Mon, Jul 14, 2025 at 09:20:22PM -0400, Sean Anderson wrote:
> Add support for minimum/maximum attributes. Like the _input attribute,
> we just need to call into the IIO API.

...

> +static ssize_t iio_hwmon_read_event(struct device *dev,
> +				    struct device_attribute *attr,
> +				    char *buf)
> +{
> +	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
> +	struct iio_hwmon_state *state = dev_get_drvdata(dev);
> +	struct iio_channel *chan = &state->channels[sattr->index];
> +	int ret, result, scale;
> +
> +	scale = iio_hwmon_scale(chan);

> +	if (scale < 0)

This part is definitely missed in the respective description.

> +		return scale;
> +
> +	ret = iio_read_event_processed_scale(chan, IIO_EV_TYPE_THRESH,
> +					     sattr->nr, IIO_EV_INFO_VALUE,
> +					     &result, scale);
> +	if (ret < 0)

Why ' < 0' here?

> +		return ret;
> +
> +	return sprintf(buf, "%d\n", result);

Mustn't be sysfs_emit() ?

> +}

...

> +	ret = iio_write_event_processed_scale(chan, IIO_EV_TYPE_THRESH,
> +					      sattr->nr, IIO_EV_INFO_VALUE,
> +					      val, scale);
> +	if (ret < 0)

< 0 ?

> +		return ret;

...

> +static int add_event_attr(struct device *dev, struct iio_hwmon_state *st,
> +			  int i, enum iio_event_direction dir,
> +			  const char *fmt, ...)

Same comments as per previous patch adding another attribute API.

...

> +	va_start(ap, fmt);
> +	a->dev_attr.attr.name = devm_kvasprintf(dev, GFP_KERNEL, fmt, ap);
> +	va_end(ap);

Can't %pV be used?

-- 
With Best Regards,
Andy Shevchenko