javascript - Failed to claim interface 0: Device or resource busy

Question

I am trying to communicate with usb device using WEBUSB API. BUT when I am trying to claim Interface it shows

"DOMException: Unable to claim interface"

the bConfigurationvalue is 1 and interface number is 0. I am adding the output of command lsusb -v below

~$ lsusb -v
Bus 001 Device 005: ID 0930:6544 Toshiba Corp. TransMemory-Mini / Kingston DataTraveler 2.0 Stick (2GB)
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x0930 Toshiba Corp.
  idProduct          0x6544 TransMemory-Mini / Kingston DataTraveler 2.0 Stick (2GB)
  bcdDevice            1.00
  iManufacturer           1 TOSHIBA 
  iProduct                2 TransMemory     
  iSerial                 3 C412F52D6C84CFC0A0012AEF
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              200mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk-Only
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval             255
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval             255
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  bNumConfigurations      1
Device Status:     0x0000
  (Bus Powered)

Why does it shows the device or resources busy. How to claim the interface?.

Answer 1

The device is shown as busy because this is a USB Mass Storage class device and Linux will automatically load a kernel driver when it is connected that claims interface 0.

You can manually unbind the USB device driver with the following command:

echo -n "1-1:1.0" > /sys/bus/usb/drivers/usb-storage/unbind

"1-1:1.0" specifies the device and interface that the usb-storage driver should unbind from. "1-1" means bus 1, port 1 and "1.0" means configuration 1, interface 0. This information is printed in the kernel log when the device is connected like this,

usb-storage 1-1:1.0: USB Mass Storage device detected

The bus and port number for your device will likely differ.

While this should allow you to use this device with WebUSB it is not likely useful as a long term solution because of the manual steps involved. WebUSB is designed for devices without built-in operating system drivers.