linux-kernel - Re: [PATCH 5/7] hwmon: iio: Add helper function for creating attributes

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Message-ID: <aHYTcAO7sHsyevDH@smile.fi.intel.com>
Date: Tue, 15 Jul 2025 11:38:08 +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 5/7] hwmon: iio: Add helper function for creating
 attributes

On Mon, Jul 14, 2025 at 09:20:21PM -0400, Sean Anderson wrote:
> Add a helper function to create attributes and initialize their fields.
> This reduces repetition when creating several attributes per channel.

...

> + * @num_attrs:          length of @attrs

Other lines use TABs.

...

> +static int add_device_attr(struct device *dev, struct iio_hwmon_state *st,

This should hint that this is managed:

add_device_managed_attr()

?

> +			   ssize_t (*show)(struct device *dev,
> +					   struct device_attribute *attr,
> +					   char *buf),
> +			   int i, const char *fmt, ...)

__printf() attribute is missing.

> +{
> +	struct sensor_device_attribute *a;
> +	va_list ap;
> +
> +	a = devm_kzalloc(dev, sizeof(*a), GFP_KERNEL);
> +	if (!a)
> +		return -ENOMEM;
> +
> +	sysfs_attr_init(&a->dev_attr.attr);
> +	va_start(ap, fmt);
> +	a->dev_attr.attr.name = devm_kvasprintf(dev, GFP_KERNEL, fmt, ap);
> +	va_end(ap);
> +	if (!a->dev_attr.attr.name)
> +		return -ENOMEM;
> +
> +	a->dev_attr.show = show;
> +	a->dev_attr.attr.mode = 0444;
> +	a->index = i;
> +
> +	st->attrs[st->num_attrs++] = &a->dev_attr.attr;
> +	return 0;
> +}

...

>  	struct device *dev = &pdev->dev;
>  	struct iio_hwmon_state *st;
> -	struct sensor_device_attribute *a;
> -	int ret, i, attr = 0;
> +	int ret, i;

Also move it a bit to make it more of a reversed xmas tree ordering?

>  	int in_i = 1, temp_i = 1, curr_i = 1, humidity_i = 1, power_i = 1;
>  	enum iio_chan_type type;
>  	struct iio_channel *channels;

-- 
With Best Regards,
Andy Shevchenko