linux-kernel - Re: [PATCH v6 7/8, needs improvement] hid: add suspend/resume hooks for hid drivers

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Message-ID: <alpine.LNX.2.00.1004112029220.8345@pobox.suse.cz>
Date:	Sun, 11 Apr 2010 20:31:18 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Rick L. Vinyard Jr." <rvinyard@...nmsu.edu>,
	Nicu Pavel <npavel@...ner.com>,
	Oliver Neukum <oliver@...kum.org>
Subject: Re: [PATCH v6 7/8, needs improvement] hid: add suspend/resume hooks
 for hid drivers

On Sun, 11 Apr 2010, Bruno Prémont wrote:

> > We should also consider putting the hook calls into bluetooth 
> > implementation as well (though there is currently no driver using it, but 
> > I don't know, maybe Wacom could benefit from it as well).
> 
> Where do I find the bluetooth HID bits? I've been searching through kernel
> sources (under drivers/) but did not find bluetooth code trying to
> register a HID device...

They are in net/bluetooth/hidp. Not really obvious, I know, but Marcel 
wanted it this way.

> As far as I understand the code, in auto-suspend case if the driver 
> sends commands to the device it will have to call usbhid_wait_io(). 
> Please correct me if I'm wrong!

It's not needed. There is a queuing mechanism in place on 
'resumption_waker' workqueue.

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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