On Thu, 11 Jun 2009, jack craig wrote:
> hi usb folks,
>
> i am using libusb1(libusb1-1.0.0-2.5.moblin2.i586) to talk to a widget and am getting an error i need to debug.
>
> dmesg has ...
>
> 203.791177] usb 3-2: new low speed USB device using uhci_hcd and address 2
> [ 203.959260] usb 3-2: New USB device found, idVendor=1808, idProduct=5555
> [ 203.959275] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
> [ 203.959288] usb 3-2: Product: USB to OBD-2
> [ 203.959296] usb 3-2: Manufacturer: Multiplex Engineering
> [ 203.959639] usb 3-2: configuration #1 chosen from 1 choice
> [ 203.989634] generic-usb 0003:1808:5555.0003: hiddev97,hidraw2: USB HID v1.00 Device [Multiplex Engineering USB to
> OBD-2] on usb-0000:00:1d.1-2/input0
> *[ 206.189373] usb 3-2: usbfs: process 1923 (obdscan) did not claim interface 0 before use
> [ 206.189417] usb 3-2: usbfs: process 1923 (obdscan) did not claim interface 0 before use
> [ 206.189457] usb 3-2: usbfs: process 1923 (obdscan) did not claim interface 0 before use*
>
> my issue is that i did indeed claim my interface and got a zero return from the call, yet this
> sysfs complains.
You mean "dmesg complains", not "sysfs complains".
> my api use looks like, ...
>
> r = libusb_init(NULL);
> libusb_set_debug(NULL, 0x3);
>
> err = libusb_open(found, &devh); (this found is legit and i get a handle back in devh)
>
> r = libusb_kernel_driver_active(devh, 0);
> if (r > 0) {
> r = libusb_detach_kernel_driver(devh, 0);
>
> * r = libusb_claim_interface(devh, 0);*
>
> if (devh) {
> r = libusb_release_interface(devh, 0);
> libusb_close(devh);
> }
> libusb_exit(NULL);
>
>
> would some kind soul tell me how to crank up the sysfs verbosity so i can debug this issue?
Before starting your program, do this:
echo 1 >/sys/module/usbcore/parameters/usbfs_snoop
Alan Stern
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