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.2.00.1003311415000.24576@pobox.suse.cz>
Date:	Wed, 31 Mar 2010 14:15:53 +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-fbdev@...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>,
	Jaya Kumar <jayakumar.lkml@...il.com>
Subject: Re: [PATCH v6 7/8, needs improvement] hid: add suspend/resume hooks
 for hid drivers

On Tue, 30 Mar 2010, Bruno Prémont wrote:

> Add suspend/resume hooks for HID drivers so these can do some
> additional state adjustment when device gets suspended/resumed.
> 
> This patch calls these hooks from usbhid suspend/resume functions,
> only calling suspend on plain suspend, not autosuspend.
> (it might be worth adding an autosuspend parameter to suspend
> hook and calling suspend in both cases)
> 
> Signed-off-by: Bruno Prémont <bonbons@...ux-vserver.org>
> ---
> 
> Note:
>   this patch needs improvements as mentionned by Olivier Neukum:
>   - suspend hook for both system suspend and autosuspend
>   - no call of hook on USB-HID-resume failure

I agree with Oliver's comments.

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).

Thanks,

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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