Just read this in the linux-usb list and I think this might be useful for some people here.
Regards, Xiaofan --------- Forwarded message ---------- From: Felipe Balbi Date: Mon, Mar 4, 2013 at 10:35 PM Subject: Re: [PATCH] drivers/usb/gadget: beautify code, delete unused code If you want, I have a simple libusb-1.0-based little app which can issue resets to any device you ask. Currently it will reset a device 10K times but you can remove the for loop if you want: 8<------------------- cut here ------------------------- /* $(CROSS_COMPILE)gcc -Wall -O2 -g -lusb-1.0 -o device-reset device-reset.c */ /** * device-reset.c - Reset a USB device multiple times * * Copyright (C) 2013 Felipe Balbi <ba...@ti.com> * * This file is part of the USB Verification Tools Project * * USB Tools is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the license, or * (at your option) any later version. * * USB Tools is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with USB Tools. If not, see <http://www.gnu.org/licenses/>. */ #include <stdio.h> #include <time.h> #include <string.h> #include <stdlib.h> #include <stdint.h> #include <unistd.h> #include <fcntl.h> #include <ctype.h> #include <ctype.h> #include <errno.h> #include <getopt.h> #include <sys/types.h> #include <sys/stat.h> #include <sys/time.h> #include <libusb-1.0/libusb.h> #define OPTION(n, h, v) \ { \ .name = #n, \ .has_arg = h, \ .val = v, \ } static struct option device_reset_opts[] = { OPTION("help", 0, 'h'), OPTION("device", 1, 'D'), { } /* Terminating entry */ }; static void usage(char *cmd) { fprintf(stdout, "%s -D VID:PID\n", cmd); } int main(int argc, char *argv[]) { libusb_context *context; libusb_device_handle *udevh; unsigned vid = 0; unsigned pid = 0; int ret = 0; int i; while (1) { int optidx; int opt; char *token; opt = getopt_long(argc, argv, "D:h", device_reset_opts, &optidx); if (opt == -1) break; switch (opt) { case 'D': token = strtok(optarg, ":"); vid = strtoul(token, NULL, 16); token = strtok(NULL, ":"); pid = strtoul(token, NULL, 16); break; case 'h': /* FALLTHROUGH */ default: usage(argv[0]); exit(-1); } } libusb_init(&context); udevh = libusb_open_device_with_vid_pid(context, vid, pid); if (!udevh) { perror("open"); ret = -ENODEV; goto out0; } for (i = 0; i < 10000; i++) { ret = libusb_reset_device(udevh); printf("Reset #%d: ", i + 1); if (ret < 0) { printf("FAILED\n"); break; } else { printf("PASSED\n"); } } libusb_close(udevh); out0: libusb_exit(context); return ret; } -- balbi ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb _______________________________________________ libusbx-devel mailing list libusbx-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libusbx-devel
