Comment 4 for bug 811760

Jiandong, I am also trying to get the fermi module to work on arm (Pandaboard), I have a funny issue, I never get a /dev/nwfermi device, even though the module builds and logs messages about the monitor when I plug in the USB..

After digging a bit, it seems that the fermi_probe function is called twice, first time it finds the endpoint, second time, the interface-address is 0x200 higher and two endpoints, none of which are bulk-in is found:

[ 86.137359] usb 1-1.2: new high speed USB device number 4 using ehci-omap
[ 86.266906] usb 1-1.2: New USB device found, idVendor=0424, idProduct=2517
[ 86.274658] usb 1-1.2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 86.287048] hub 1-1.2:1.0: USB hub found
[ 86.291595] hub 1-1.2:1.0: 7 ports detected
[ 86.583038] usb 1-1.2.1: new full speed USB device number 5 using ehci-omap
[ 86.715240] usb 1-1.2.1: New USB device found, idVendor=1926, idProduct=0068
[ 86.723114] usb 1-1.2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 86.731689] usb 1-1.2.1: Product: Touchscreen
[ 86.736358] usb 1-1.2.1: Manufacturer: NextWindow
[ 86.743133] nw_fermi: fermi_probe called with interface ea8cec00 and device id struct c0735634
[ 86.752349] nw_fermi: Num endpoints: 1
[ 86.756347] nw_fermi: Endpoint 0 (00000081)
[ 86.760894] nw_fermi: Direction- In: 1
[ 86.765319] nw_fermi: Direction-Out: 0
[ 86.769500] nw_fermi: Bulk transfer: 1
[ 86.773712] nw_fermi: Max packet size: 64
[ 86.778839] input: Nextwindow Fermi Touchscreen as /devices/virtual/input/input1
[ 86.788757] nwfermi 1-1.2.1:1.0: NextWindow Fermi device now attached to nwfermi-192
[ 86.797668] nw_fermi: fermi started bulk_reads error code 0
[ 86.803863] nw_fermi: nwfermi started..
[ 86.808868] nw_fermi: fermi_probe called with interface eb5aa000 and device id struct c0735634
[ 86.818176] nw_fermi: Num endpoints: 2
[ 86.822174] nw_fermi: Endpoint 0 (00000082)
[ 86.822265] nw_fermi: Direction- In: 1
[ 86.830993] nw_fermi: Direction-Out: 0
[ 86.835205] nw_fermi: Bulk transfer: 0
[ 86.839385] nw_fermi: Max packet size: 64
[ 86.843963] nw_fermi: Endpoint 1 (00000002)
[ 86.843963] nw_fermi: Direction- In: 0
[ 86.852691] nw_fermi: Direction-Out: 0
[ 86.856903] nw_fermi: Bulk transfer: 0
[ 86.861175] nw_fermi: Max packet size: 64
[ 86.866241] input: Nextwindow Fermi Touchscreen as /devices/virtual/input/input2
[ 86.875366] nwfermi 1-1.2.1:1.1:: NextWindow Fermi device now attached to nwfermi-193
[ 86.884338] nw_fermi: fermi started bulk_reads error code -22
[ 86.884338] nw_fermi: Could not start bulk reads.

But alas, no /dev/nw* devices.. The same driver on my x86 machine seems to work perfectly.