Re: Howto debug failure to use remote wakup?

On Sat, 10 Feb 2007, Frédéric RISS wrote:

> > Yes, remote wakeup works under MacOS. I installed the MacOS USB development
> > packages which should allow me to dump some USB activity. Do you think
> > there may be something useful in these logs?

Are you talking about waking up from Suspend-to-RAM or from 
Suspend-to-Disk?

> > I suppose it's also possible that the device needs some magic command to
> > be issued to do remote wakeup. I've read that under MacOS it uses a
> > small specific kernel driver in addition to the HID one. Is something
> > like that possible? If yes, how can one find out?
> 
> I installed the MacOS USB Probe program and I'm seeing a control
> transaction from the IR Receiver driver at the time of suspend. The
> transaction is described by a structure named DevRequest and containing
> these fields:
> 
>     UInt8       bmRequestType = 0x02
>     UInt8       bRequest      = 0x01
>     UInt16      wValue        = 0x0000
>     UInt16      wIndex        = 0x83
>     UInt16      wLength       = 0x0
>     void *      pData         = ??
>     UInt32      wLenDone      = ??

That request is just a Clear-Halt for endpoint 0x83.  I doubt that it has 
anything to do with remote wakeup.

> I tried to reproduce such a request using:
> 
>                 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
>                                          0x01, 0x02, 0, 0x83, NULL, 0, 100);
> 
> from generic.c:generic_suspend when the device Ids match my device. As I
> don't fully understand what this is doing, I also tried with
> usb_rcvctrlpipe. Neither did produce an error, but neither helped to
> enable the device to initiate a remote wakeup. 
> 
> I'd appreciate some advice about that. Is it possible that this command
> is what's needed to make remote wakeup work?

Probably not.

>  Should I try to put the
> above call at some other place in the suspend process? 
> 
> I can try to dig other information out of the traces, if someone tells
> me what to look for.

Anything you can't understand...

Alan Stern


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