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Old 01-02-2014, 09:46 AM   #1
onamatic
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Registered: Mar 2008
Posts: 11

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Rebinding usb hid devices to hid-generic driver fails


using kernel 3.8.0-34-generic (Mint 15)
If I plug in a usb mouse (mfr/vendor id: 03F0:8607) it works fine and is (by default) handled with hid-generic:
# tree /sys/bus/hid/drivers/hid-generic
/sys/bus/hid/drivers/hid-generic
├── 0003:03F0:8607.0007 -> ../../../../devices/pci0000:00/0000:00:12.2/usb1/1-2/1-2.1/1-2.1.2/1-2.1.2:1.0/0003:03F0:8607.0007
├── 0003:093A:2510.0001 -> ../../../../devices/pci0000:00/0000:00:13.0/usb5/5-1/5-1:1.0/0003:093A:2510.0001
├── bind
├── module -> ../../../../module/hid_generic
├── new_id
├── uevent
└── unbind

Now I unbind the device:
# echo -n 0003:03F0:8607.0007 > /sys/bus/hid/drivers/hid-generic/unbind
The binding has gone:
# tree /sys/bus/hid/drivers/hid-generic
/sys/bus/hid/drivers/hid-generic
├── 0003:093A:2510.0001 -> ../../../../devices/pci0000:00/0000:00:13.0/usb5/5-1/5-1:1.0/0003:093A:2510.0001
├── bind
├── module -> ../../../../module/hid_generic
├── new_id
├── uevent
└── unbind

and the mouse stops working - as expected.

But now I want to rebind it:
# echo -n 0003:03F0:8607.0007 > /sys/bus/hid/drivers/hid-generic/bind
The binding apparently succeeds:
# tree /sys/bus/hid/drivers/hid-generic
/sys/bus/hid/drivers/hid-generic
├── 0003:03F0:8607.0008 -> ../../../../devices/pci0000:00/0000:00:12.2/usb1/1-2/1-2.1/1-2.1.2/1-2.1.2:1.0/0003:03F0:8607.0008
├── 0003:093A:2510.0001 -> ../../../../devices/pci0000:00/0000:00:13.0/usb5/5-1/5-1:1.0/0003:093A:2510.0001
├── bind
├── module -> ../../../../module/hid_generic
├── new_id
├── uevent
└── unbind

but the mouse doesn't start working again. Why not? The only thing that has changed is the instance number (in bold).
Would you expect this to work or is the bind/unbind process a bit more complicated?

Last edited by onamatic; 01-02-2014 at 09:48 AM. Reason: clarity
 
Old 05-25-2014, 10:46 AM   #2
dometec
LQ Newbie
 
Registered: Dec 2009
Posts: 1

Rep: Reputation: 0
Test

Hi, I tried your procedure with a USB bar code scanner (viewed as a HID-generic device) and work as aspected.

Regards
Domenico
 
  


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