On Wed, Feb 9, 2011 at 5:26 PM, jon.schell <[email protected]> wrote:
> I'm creating a binary attribute (struct bin_attribute) for a sys/class/
> led driver,
Wait, stop right there. Binary sysfs attributes are for sending/receiving
binary data that is not intrepreted/manipulated by the kernel at all.
And LED devices do not seem to fall into the category that needs this
type of sysfs file, so please do not create it.
> and it seems to be correct, but when I echo data to the
> write function, it seems to get called 11 times. Here's what I have
> and did:
>
> static ssize_t my_write(struct kobject *kobj, struct bin_attribute
> *attr, char *buf, loff_t pos, size_t size)
> {
> print_string("called my_write function correctly.");
> return 0;
> }
Did you read the documentation on what your write function should return?
(hint, 0 is not what you think it means here).
Fix this and your problem will be solved.
But again, don't create a binary sysfs attribute, that is almost
never what you want.
What specifically are you wanting to export to userspace for a LED device
that is not working with the existing LED api in the kernel?
thanks,
greg k-h
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