mirror of
git://projects.qi-hardware.com/ben-wpan.git
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133 lines
2.5 KiB
C
133 lines
2.5 KiB
C
/*
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* usbperf/usbperf.c - Measure the rate of control transfers a device can do
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <sys/time.h>
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#include <usb.h>
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#include "usbopen.h"
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#define SYSFS_USB_BASE "/sys/bus/usb/devices"
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static void speed(usb_dev_handle *dev)
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{
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struct usb_device *device = usb_device(dev);
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struct usb_bus *bus = device->bus;
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DIR *dir;
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const struct dirent *de;
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char buf[1000]; /* @@@ plenty :) */
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FILE *file;
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int res, devnum;
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float speed;
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dir = opendir(SYSFS_USB_BASE);
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if (!dir) {
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perror(SYSFS_USB_BASE);
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exit(1);
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}
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while ((de = readdir(dir))) {
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if (atoi(de->d_name) != atoi(bus->dirname))
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continue;
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sprintf(buf, SYSFS_USB_BASE "/%s/devnum", de->d_name);
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file = fopen(buf, "r");
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if (!file)
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continue;
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res = fscanf(file, "%d", &devnum);
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fclose(file);
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if (res != 1 || devnum != atoi(device->filename))
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continue;
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sprintf(buf, SYSFS_USB_BASE "/%s/speed", de->d_name);
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file = fopen(buf, "r");
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if (!file)
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continue;
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res = fscanf(file, "%f", &speed);
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fclose(file);
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printf("%g Mbps\n", speed);
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}
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closedir(dir);
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}
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static void rounds(usb_dev_handle *dev, int n)
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{
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struct timeval t0, t1, t2;
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double s = 0, d;
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char buf;
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int i, res;
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gettimeofday(&t0, NULL);
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for (i = 0; i != n; i++) {
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gettimeofday(&t1, NULL);
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/* GET_CONFIGURATION */
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res = usb_control_msg(dev, USB_ENDPOINT_IN | USB_RECIP_DEVICE,
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USB_REQ_GET_CONFIGURATION, 0, 0, &buf, 1, 1000);
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if (res < 0)
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fprintf(stderr, "usb_control_msg returns %d\n", res);
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gettimeofday(&t2, NULL);
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s += (t2.tv_sec-t1.tv_sec)+(t2.tv_usec-t1.tv_usec)*1e-6;
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}
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d = (t2.tv_sec-t0.tv_sec)+(t2.tv_usec-t0.tv_usec)*1e-6;
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printf("Overall: %.3f ms/req\n", d/n*1000.0);
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printf("Each: %.3f ms/req\n", s/n*1000.0);
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}
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static void usage(const char *name)
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{
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fprintf(stderr,
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"usage: %s [vendor]:[product] [rounds]\n"
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, name);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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usb_dev_handle *dev;
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int n = 1000;
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switch (argc) {
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case 2:
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break;
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case 3:
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n = atoi(argv[2]);
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if (n <= 0)
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usage(*argv);
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break;
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default:
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usage(*argv);
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}
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parse_usb_id(argv[1]);
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dev = open_usb(0, 0);
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if (!dev)
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return 1;
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speed(dev);
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rounds(dev, n);
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return 0;
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}
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