linux-kernel - Re: Standard handling of boolean attributes in sysfs.

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Date:	Tue, 22 Mar 2011 10:59:43 +0000
From:	Jonathan Cameron <jic23@....ac.uk>
To:	Greg KH <greg@...ah.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	David Brownell <david-b@...bell.net>
Subject: Re: Standard handling of boolean attributes in sysfs.

On 03/21/11 20:14, Greg KH wrote:
> On Mon, Mar 21, 2011 at 08:02:40PM +0000, Jonathan Cameron wrote:
>> Hi All,
>>
>> Just wondering what the feeling would be about having
>> a utility function similar to sysfs_streq to provide a
>> consistent option for all those sysfs attributes out there
>> where
>>
>> 1, on, true -> 1
>> 0, off, false -> 0
>>
>> Or does such a beast already exist and I'm just being unobservant?
> 
> We have the one in debugfs that I think people use for sysfs.  Have you
> looked at that?
> 
Thanks for the pointer...

write_file_bool in fs/debugfs/file.c?  

What is there is pretty much what is needed, but it's not a general
use function like sysfs_streq. Clearly it would make sense to use
what is there as a basis of such a function. 

To save others looking it up, the relevant bit is:

	switch (buf[0]) {
	case 'y':
	case 'Y':
	case '1':
		*val = 1;
		break;
	case 'n':
	case 'N':
	case '0':
		*val = 0;
		break;
	}

There are a few cut and paste copies of this about (mostly in IIO drivers actually
hence why I asking if there is a better way :).

Unless there is demand for it elsewhere I'll just add a utility function to the IIO
core to do this and we can revisit the case for a general function when the need
turns up elsewhere.

Jonathan
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