[Libusb-devel] libusb-0.1.5 Device or resource busy problem

[William A. G. <bg...@bi...>]

Guys:


I'm running libusb-0.1.5 on Red Hat's Linux-2.4.18-0.22.  My USB
device is a StrongARM SA1110-powered arm-linux system (similar to an
iPAQ), running 2.4.9-rmk2-np1.  This device has three endpoints:
control, bulk IN, and bulk OUT.

I can open/close the device, but bulk reads and writes return EBUSY.
Here is my test program (error handling omitted for brevity):

#define VENDOR_ID  0xfff0
#define PRODUCT_ID  0x0001

extern int usb_debug;

int main(int argc, char *argv[])
{
  struct usb_device *target;
  struct usb_dev_handle *handle;
  char cbuf[256];
  int ret;

  usb_debug = 3;
  usb_init();
  usb_find_busses();
  usb_find_devices();

  target = find_target(VENDOR_ID, PRODUCT_ID);
  print_configuration(&(target->config[0])); /* from testlibusb */

  handle = usb_open(target);
  ret = usb_bulk_read(handle, 1, cbuf, sizeof(cbuf) - 1, 1000);
  ret = usb_bulk_write(handle, 0x82, "foo\n", 4, 1000);
  usb_close(handle);
  return 0;
}

The output I get is this:

$ insmod usbserial vendor=0xfff0 product=0x0001 debug=1
Using /lib/modules/2.4.18-0.22/kernel/drivers/usb/serial/usbserial.o

(plug in USB device)

$ tail /var/log/messages
Apr 16 21:29:29 mars kernel: hub.c: USB new device connect on bus2/2, assigned device number 7
Apr 16 21:29:29 mars kernel: usbserial.c: Generic converter detected
Apr 16 21:29:29 mars kernel: usbserial.c: Generic converter now attached to ttyUSB0 (or usb/tts/0 for devfs)
Apr 16 21:29:32 mars /etc/hotplug/usb.agent: ... no modules for USB product fff0/1/1

$ ./usbtest
usb_os_init: Found USB VFS at /proc/bus/usb
usb_find_busses: Skipping non bus directory devices
usb_find_busses: Skipping non bus directory drivers
usb_find_busses: Found 002
usb_find_busses: Found 001
usb_find_devices_on_bus: Found 001 on 001
usb_find_devices_on_bus: Found 001 on 002
usb_find_devices_on_bus: Found 002 on 002
usb_find_devices_on_bus: Found 005 on 002
usb_find_devices_on_bus: Found 006 on 002
usb_find_devices_on_bus: Found 007 on 002
skipped 1 class/vendor specific interface descriptors
  wTotalLength:         32
  bNumInterfaces:       1
  bConfigurationValue:  1
  iConfiguration:       0
  bmAttributes:         40h
  MaxPower:             0
    bInterfaceNumber:   0
    bAlternateSetting:  0
    bNumEndpoints:      2
    bInterfaceClass:    255
    bInterfaceSubClass: 0
    bInterfaceProtocol: 0
    iInterface:         4
      bEndpointAddress: 01h
      bmAttributes:     02h
      wMaxPacketSize:   64
      bInterval:        0
      bRefresh:         0
      bSynchAddress:    0
      bEndpointAddress: 82h
      bmAttributes:     02h
      wMaxPacketSize:   64
      bInterval:        0
      bRefresh:         0
      bSynchAddress:    0
USB error: error reading from bulk endpoint 0x82: Device or resource busy
USB error: error writing to bulk endpoint 1: Device or resource busy

From strace:

open("/proc/bus/usb/002/007", O_RDWR)   = 3
ioctl(3, USBDEVFS_BULK, 0xbffed9a0)     = -1 EBUSY (Device or resource busy)
ioctl(3, USBDEVFS_BULK, 0xbffed9a0)     = -1 EBUSY (Device or resource busy)



Does the error message about usb.agent in the logs have anything to do
with this?  All I'm trying to do is set up a usbserial link with the
device.  What am I missing?


Thanks!


b.g.
-- 
Bill Gatliff
bg...@bi...