cypress usbdebug userspace test

#include <stdio.h>
#include <libusb-1.0/libusb.h>
#include <stdint.h>
#include <string.h>

int main(int argc, char*argv[])
{
    int res                      = 0;
    libusb_device_handle* handle = 0;
    int kernelDriverDetached     = 0;
    int numBytes                 = 0;
    int a,b,i;
    unsigned char str[128];
    unsigned char buffer[128];

    res = libusb_init(0);
    if (res != 0) {
        fprintf(stderr, "Error initialising libusb.\n");
        return 1;
    }

    handle = libusb_open_device_with_vid_pid(0, 0x04b4, 0x00f0);
    if (!handle) {
        fprintf(stderr, "Unable to open device.\n");
        return 1;
    }

    if (libusb_kernel_driver_active(handle, 0)) {
        res = libusb_detach_kernel_driver(handle, 0);
        if (res == 0) {
          kernelDriverDetached = 1;
        } else {
          fprintf(stderr, "Error detaching kernel driver.\n");
          return 1;
        }
    }

    res = libusb_claim_interface(handle, 0);
    if (res != 0) {
        fprintf(stderr, "Error claiming interface.\n");
        return 1;
    }

    for (a=0; a<100; a++) {
        memset(str, 0, 128);
        res = libusb_interrupt_transfer(handle, 0x81, str, 128, &numBytes, 1000);
        if (0 == res) {
            b = 0;
            for(i=0; i<32; i++) {
                b += sprintf(&buffer[b], "%.2x ",str[i]);
            }
            buffer[b++] = '\n';
            buffer[b++] = 0;
            printf("%s",buffer);
        } else {
           fprintf(stderr, "Error receiving message %d.\n", a);
        }
    }

    res = libusb_release_interface(handle, 0);
    if (0 != res)
      fprintf(stderr, "Error releasing interface.\n");

    if (kernelDriverDetached)
        libusb_attach_kernel_driver(handle, 0);

    libusb_exit(0);

    return 0;
}