Does anybody ever tested the usb_reset_device() function in hub.c ?
I am currently developing a device driver for a digital panorama camera.
For a remote server application it is neccesary to have the ability to
initiate a usb reset without unpluging the device. I implemented an ioctl
to initiate the usb reset. The problem is that the usb_reset_device
function seems to disconnect the device two times and then connect it
two times, trying to assign it 2 device numbers. This strategy seems not
meaningfull to me (and it does obviously not work :-)).
Here is some debug output (syslog):
... kernel: usb.c: USB new device connect, assigned device number 2
... kernel: dpcusb.c: probe: vendor id 0x6cf, device id 0x1010 ifnum:0
... kernel: dpcusb.c: bound to interface: 0
... kernel: dpcusb.c: open
... kernel: dpcusb.c: ioctl >>>
... kernel: dpcusb.c: reset_device
... kernel: usb.c: USB disconnect on device 2
... kernel: dpcusb.c: disconnect
... kernel: usb.c: USB disconnect on device 2
... kernel: usb.c: USB new device connect, assigned device number 2
... kernel: usb.c: USB new device connect, assigned device number 3
... kernel: usb.c: USB device descriptor short read (expected 8, got 0)
... kernel: dpcusb.c: ioctl <<<
... kernel: usb-uhci.c: interrupt, status 3, frame# 1036
... kernel: usb-uhci-debug.h: TD @ c21a38e0/021A38E0, MaxLen=7ff DT1
EP=0 Dev=0 PID=( IN ) buf=00000000
... kernel: usb-uhci-debug.h: Len=7ff e0 IOC Stalled CRC/Timeo
... kernel: usb-uhci-debug.h: TD Link Terminate
... kernel: usb.c: USB device not accepting new address (error=-110)
(the dpcusb.c is my driver, the used usb code is the backport patch
2.3.99pre7 -> 2.2.14)
I only had a short look at the related hub and core code but i have no
idea
how to solve the problem.
Can anybody help me? This would be very nice.
(The camera should be installed at the expo2000 NEXT week :-) )
Sers, Axel.
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