linux-kernel - Re: [PATCH] input: xpad.c - Xbox 360 wireless and sysfs support

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Message-ID: <5aa163d00902161130r2030adb8h6eb1ec08bda92744@mail.gmail.com>
Date:	Mon, 16 Feb 2009 14:30:01 -0500
From:	Mike Murphy <mamurph@...clemson.edu>
To:	Greg KH <greg@...ah.com>
Cc:	Oliver Neukum <oliver@...kum.org>, linux-usb@...r.kernel.org,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] input: xpad.c - Xbox 360 wireless and sysfs support

On Mon, Feb 16, 2009 at 1:59 PM, Greg KH <greg@...ah.com> wrote:
>
> Put it on the logical device, as given to you.
>
>> I tried not to break existing functionality.  Additionally, struct
>> usb_xpad contains two device pointers: one to the actual USB device,
>> and one to an input device (see source of the in-tree xpad.c). So I
>> followed your kobject.txt documentation and samples to create a new
>> object whose sole purpose in life is to expose the sysfs interface,
>> without interfering with the existing device entries in the driver.
>> I'm not sure I see a clean way to use a single struct device here....
>
> Put it on the input device, which is what is the per-device thing.  It's
> much simpler than creating a new struct kobject.  You can even create a
> subdirectory for your attributes if you use an attribute group (which
> you should be doing anyway, it's much simpler that way.)
>

OK, one thing I'm not clear on: is there a clean API for adding
attributes to an existing struct device, or do I need to "subclass" it
(the C containment and delegation approach)?

This may take me a few days or a week or so, depending on how things
go. It's dissertation proposal season....

> And document the attributes please.
>

Will do... still need to nail down what the interface should look like.

> thanks,
>
> greg k-h
>

Thanks,
Mike
-- 
Mike Murphy
Ph.D. Candidate and NSF Graduate Research Fellow
Clemson University School of Computing
120 McAdams Hall
Clemson, SC 29634-0974 USA
Tel: +1 864.656.2838   Fax: +1 864.656.0145
http://cirg.cs.clemson.edu/~mamurph
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