linux-kernel - Re: [linux-usb-devel] [PATCH 1/2] usb

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Date:	Tue, 30 Oct 2007 09:52:43 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	linux-usb-devel@...ts.sourceforge.net
Cc:	Tilman Schmidt <tilman@...p.cc>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Greg KH <gregkh@...e.de>,
	Hansjoerg Lipp <hjlipp@....de>, Karsten Keil <kkeil@...e.de>,
	i4ldeveloper@...tserv.isdn4linux.de
Subject: Re: [linux-usb-devel] [PATCH 1/2] usb_gigaset: suspend support

Am Montag 29 Oktober 2007 schrieb Tilman Schmidt:
> From: Tilman Schmidt <tilman@...p.cc>
> 
> Add basic suspend/resume support to the usb_gigaset driver.
> 
> Signed-off-by: Tilman Schmidt <tilman@...p.cc>
> ---
> 
>  drivers/isdn/gigaset/usb-gigaset.c |   69 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 68 insertions(+), 1 deletion(-)
> 
> --- a/drivers/isdn/gigaset/usb-gigaset.c	2007-10-23 01:48:12.000000000 +0200
> +++ b/drivers/isdn/gigaset/usb-gigaset.c	2007-10-24 00:47:32.000000000 +0200
> @@ -104,10 +104,15 @@ MODULE_DEVICE_TABLE(usb, gigaset_table);
>   * flags per packet.
>   */
>  
> +/* functions called if a device of this driver is connected/disconnected */
>  static int gigaset_probe(struct usb_interface *interface,
>  			 const struct usb_device_id *id);
>  static void gigaset_disconnect(struct usb_interface *interface);
>  
> +/* functions called before/after suspend */
> +static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
> +static int gigaset_resume(struct usb_interface *intf);
> +
>  static struct gigaset_driver *driver = NULL;
>  static struct cardstate *cardstate = NULL;
>  
> @@ -117,6 +122,11 @@ static struct usb_driver gigaset_usb_dri
>  	.probe =	gigaset_probe,
>  	.disconnect =	gigaset_disconnect,
>  	.id_table =	gigaset_table,
> +	.suspend =	gigaset_suspend,
> +	.resume =	gigaset_resume,
> +	.reset_resume =	gigaset_resume,
> +	.pre_reset =	gigaset_suspend,
> +	.post_reset =	gigaset_resume,
>  };
>  
>  struct usb_cardstate {
> @@ -831,7 +843,7 @@ static void gigaset_disconnect(struct us
>  	usb_set_intfdata(interface, NULL);
>  	tasklet_kill(&cs->write_tasklet);
>  
> -	usb_kill_urb(ucs->bulk_out_urb);	/* FIXME: only if active? */
> +	usb_kill_urb(ucs->bulk_out_urb);
>  
>  	kfree(ucs->bulk_out_buffer);
>  	usb_free_urb(ucs->bulk_out_urb);
> @@ -847,6 +859,63 @@ static void gigaset_disconnect(struct us
>  	gigaset_unassign(cs);
>  }
>  
> +/* gigaset_suspend
> + * This function is called before the USB connection is suspended or reset.
> + */
> +static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
> +{
> +	struct cardstate *cs;
> +	struct usb_cardstate *ucs;
> +	int rc;
> +
> +	if ((cs = usb_get_intfdata(intf)) == NULL ||
> +	    (ucs = cs->hw.usb) == NULL) {
> +		err("%s: no cardstate", __func__);
> +		return -EFAULT;
> +	}
> +
> +	//FIXME stop common module activities? ISDN_STAT_STOP? block open()?
> +
> +	/* stop submitting bulk URBs */
> +	tasklet_disable(&cs->write_tasklet);
> +
> +	/* kill pending read URB */
> +	usb_kill_urb(ucs->read_urb);

no pending write URB?

	Regards
		Oliver
-
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