Setting max 500 mA (Was Re: [new-usb] - USB_ERR_NO_POWER on keyboard hub)

[Hans Petter Selasky]

On Monday 18 May 2009, Alexey Shuvaev wrote:
> On Mon, May 18, 2009 at 03:46:01PM +0200, Hans Petter Selasky wrote:
> > On Monday 18 May 2009, Renato Botelho wrote:
> > > I have a Sun USB Type 7 keyboard, and this keyboard has an USB hub
> > > with 3 ports on it. I'm using one of those 3 ports to plug the mouse
> > > and it's working fine.
> > >
> > > uhub5: 4 ports with 3 removable, bus powered
> > > ugen0.3: <Alcor Micro> at usbus0
> > > ums0: <Alcor Micro USB Mouse, class 0/0, rev 1.10/51.27, addr 3> on
> > > usbus0 ums0: 3 buttons and [XYZ] coordinates ID=0
> > > ugen0.4: <Sun Microsystems> at usbus0
> > > ukbd0: <Sun Microsystems Type 7 USB keyboard, class 0/0, rev
> > > 2.00/1.04, addr 4> on usbus0
> > > kbd2 at ukbd0
> > >
> > > When I tried to plug a pen drive on anothe one, I got this:
> > >
> > > usb2_set_config_index:531: power exceeded 500 > 100
> > > usb2_set_config_index:531: power exceeded 500 > 100
> > > usb2_alloc_device:1755: Failure selecting configuration index 0:
> > > USB_ERR_NO_POWER, port 2, addr 5 (ignored)
> > > ugen0.5: <ALi Corp.> at usbus0
> > > pid 3705 (hald-probe-usb2-dev), uid 0: exited on signal 11
> > > ugen0.5: <ALi Corp.> at usbus0 (disconnected)
> > >
> > > usb2_set_config_index:531: power exceeded 500 > 100
> > > usb2_set_config_index:531: power exceeded 500 > 100
> > > usb2_alloc_device:1755: Failure selecting configuration index 0:
> > > USB_ERR_NO_POWER, port 1, addr 5 (ignored)
> > > ugen0.5: <ALi Corp.> at usbus0
> > > pid 3886 (hald-probe-usb2-dev), uid 0: exited on signal 11
> > > ugen0.5: <ALi Corp.> at usbus0 (disconnected)
> > >
> > > I'm using FreeBSD 8.0-current r192140.
> > >
> > > Let me know if there is more information i need to provide.
> > >
> > > Thanks
> >
> > Hi,
> >
> > Your Keyboard HUB technically does not allow current consumption above
> > 100mA per port. Your memstick reports it needs 500mA. Probably you can
> > hack around it, but then your hardware might break ...
>
> Hello!
>
> Somewhat not directly related.
> Is it possible (in a not too intrusive way) to allow max 500mA current
> for a device on a root HUB? This is to allow fast charging of mini-usb
> connected handy.
>
> (If something dies, I knew what I was doing :)

Hi,

There is a quirk to do the opposite of what you want, to force the device 
BUS-powered. But not to force it self powered.

Look in:

/sys/dev/usb/usb_device.c

And the set_config_index function.

--HPS