linux-kernel - Re: gpiolib: add names file in gpio chip sysfs.

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Date:	Tue, 4 Aug 2009 14:02:00 -0700
From:	David Brownell <david-b@...bell.net>
To:	ben@...ff.org
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: gpiolib: add names file in gpio chip sysfs.

On Monday 03 August 2009, ben@...ff.org wrote:
> +static ssize_t chip_names_show(struct device *dev,
> +                              struct device_attribute *attr, char *buf)
> +{
> +       const struct gpio_chip*chip = dev_get_drvdata(dev);
> +       char **names = chip->names;
> +       int ptr = 0;
> +       int name;
> +
> +       if (!names)
> +               return -EINVAL;
> +
> +       for (name = 0; name < chip->ngpio && ptr < PAGE_SIZE; name++)
> +               ptr += snprintf(buf + ptr, PAGE_SIZE - ptr,
> +                               "%s\n", names[name] ? names[name] : "");

Surely the actual GPIO number should be there too?

This whole chip->names thing still seems odd to me,
since it's creating a redundant namespace.


> +
> +       return ptr;
> +}
> +DEVICE_ATTR(names, 0444, chip_names_show, NULL);
> +



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