Linux USB driver probe not called if device already plugged

1
votes

If I use a modified usb skeleton driver on Linux and I insmod the module with the USB device already plugged in, the probe function doesn't get called. I need to unplug and replug the device in order for the driver to be activated. This is not the case for e.g. the serial drivers, I made some tests. Is there a reason for this? How do I get the probe function to get called?

3
linuxusbdriverprobe

3 Answers

4
votes

Almost all USB HID devices are automatically managed by usbhid driver. Try the following:

sudo rmmod usbhid
sudo insmod your_driver
sudo insmod usbhid
3
votes

You probably need to unbind your device from usbhid and bind it to your driver:

  • try to find the thief driver in : /sys/bus/usb/drivers/usbhid/
  • unbind it : echo -n "1-1:1.0" > /sys/bus/usb/drivers/usbhid/unbind
  • bind your device :
    • echo <vendor> <product> > /sys/bus/usb/drivers/my_driver/new_id or if you already have a bus id :
    • echo -n "1-1:1.0" > /sys/bus/usb/drivers/my_driver/bind

see http://www.ha19.no/usb/ see http://lwn.net/Articles/143397/

1
votes

Some software from us was opening the device from /proc/bus/usb and the device was claimed by the usbfs driver, so the new driver couldn't claim the device.