linux usb主机设备驱动

#include <stdio.h>
#include <stdlib.h>
#include <libusb.h>

int main() {
    libusb_context *ctx;
    int r;

    // 初始化libusb
    r = libusb_init(&ctx);
    if (r < 0) {
        fprintf(stderr, "Failed to initialize libusb: %s\n", libusb_error_name(r));
        return EXIT_FAILURE;
    }

    // 枚举USB设备
    libusb_device **devs;
    ssize_t cnt = libusb_get_device_list(ctx, &devs);
    if (cnt < 0) {
        fprintf(stderr, "Failed to get device list: %s\n", libusb_error_name(cnt));
        libusb_exit(ctx);
        return EXIT_FAILURE;
    }

    printf("Found %zd USB devices:\n", cnt);
    for (ssize_t i = 0; i < cnt; i++) {
        libusb_device *dev = devs[i];
        struct libusb_device_descriptor desc;
        r = libusb_get_device_descriptor(dev, &desc);
        if (r < 0) {
            fprintf(stderr, "Failed to read device descriptor: %s\n", libusb_error_name(r));
            continue;
        }

        printf("%04x:%04x (bus %d, device %d)\n",
               desc.idVendor, desc.idProduct,
               libusb_get_bus_number(dev), libusb_get_device_address(dev));
    }

    // 释放设备列表
    libusb_free_device_list(devs, 1);

    // 退出libusb
    libusb_exit(ctx);

    return EXIT_SUCCESS;
}