使用libusb时遇到的问题

使用 libusb_open_device_with_vid_pid 打开设备是成功的
使用  libusb_claim_interface 注册接口时候失败 返回值： -6
打印来的结果：usb_claim_interface error -6 No such device or address
折腾了一下午没结果，到这里请教一下 先谢谢了
代码和设备信息如下：

复制代码 static int find_device7001(void) {     devh7001 = libusb_open_device_with_vid_pid(NULL, 0x0925, 0x7001);     return devh7001 ? 0 : -EIO; } int main(void){ libusb_device **devs;     int r;     ssize_t cnt;     r = libusb_init(NULL);     if (r < 0)         return r;     //cnt = libusb_get_device_list(NULL, &devs);     //if (cnt < 0)     //    return (int) cnt;     //print_devs(devs);     //libusb_free_device_list(devs, 1);     r = find_device7001();     if (r < 0) {         fprintf(stderr, "Could not find/open device\n");         goto out;     }     r = libusb_claim_interface(devh7001, 0);     if (r < 0) {         fprintf(stderr, "usb_claim_interface error %d %s\n", r, strerror(-r));         goto out;     }     printf("claimed interface\n");           out:     libusb_close(devh7001);         libusb_exit(NULL);     return 0;; }

执行 lsusb是这样的

复制代码 [root@FriendlyARM lib]# lsusb Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 004: ID 0925:7001 Lakeview Research Bus 001 Device 003: ID 0925:7002 Lakeview Research Bus 001 Device 002: ID 0424:2514 Standard Microsystems Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 001 Device 004: ID 0925:7001 Lakeview Research
Bus 001 Device 003: ID 0925:7002 Lakeview Research
上面这2个是我的设备

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自己解决了，原因是设备没有激活，代码如下

复制代码      Can you detach it? Try         r = libusb_kernel_driver_active(hd, 0);         printf("libusb_kernel_driver_active = %d\n", r);         if (r == 1) {                 r = libusb_detach_kernel_driver(hd, 0);                 printf("libusb_detach_kernel_driver = %d\n", r);         }