Problems with adding a sysfs file

[Abhishek Bhardwaj]

I used a pr_debug and printk KERN_INFO ,before my original email , to
verify they weren't being called.

On Apr 17, 2017 1:43 PM, <valdis.kletnieks at vt.edu> wrote:

> On Mon, 17 Apr 2017 01:17:08 -0700, Abhishek Bhardwaj said:
> > I followed this link to add a sysfs file
> > http://kroah.com/log/blog/2013/06/26/how-to-create-a-
> sysfs-file-correctly/
> > .
> >
> > I set the driver.groups field and declared the attribute and attribute
> > groups required by the sysfs file. When I boot my kernel I see the
> > file but my store and show handlers don't get called when I try to cat
> > or echo to the file. Is there any step I'm missing ?.
>
> The traditional way to start debugging this is to add a line at the
> beginning
> of your show and store routines:
>
>         printk(KERN_DEBUG "Now in our special sysfs show routine\n");
>
> and see if it shows up in your dmesg or not.  If not, your routine
> is probably not being called.  If it is, the problem is in the routine.
>
> (You'd be surprised how often people say their routine isn't getting
> called,
> when it in fact is, or vice versa..)
>
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