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断开usb 、reset usb 的操作方法

USB devfs 提供了许多操作USB的方法,包括

usb devfs 方法

#define USBDEVFS_CONTROL           _IOWR('U', 0, struct usbdevfs_ctrltransfer)
#define USBDEVFS_CONTROL32           _IOWR('U', 0, struct usbdevfs_ctrltransfer32)
#define USBDEVFS_BULK              _IOWR('U', 2, struct usbdevfs_bulktransfer)
#define USBDEVFS_BULK32              _IOWR('U', 2, struct usbdevfs_bulktransfer32)
#define USBDEVFS_RESETEP           _IOR('U', 3, unsigned int)
#define USBDEVFS_SETINTERFACE      _IOR('U', 4, struct usbdevfs_setinterface)
#define USBDEVFS_SETCONFIGURATION  _IOR('U', 5, unsigned int)
#define USBDEVFS_GETDRIVER         _IOW('U', 8, struct usbdevfs_getdriver)
#define USBDEVFS_SUBMITURB         _IOR('U', 10, struct usbdevfs_urb)
#define USBDEVFS_SUBMITURB32       _IOR('U', 10, struct usbdevfs_urb32)
#define USBDEVFS_DISCARDURB        _IO('U', 11)
#define USBDEVFS_REAPURB           _IOW('U', 12, void *)
#define USBDEVFS_REAPURB32         _IOW('U', 12, __u32)
#define USBDEVFS_REAPURBNDELAY     _IOW('U', 13, void *)
#define USBDEVFS_REAPURBNDELAY32   _IOW('U', 13, __u32)
#define USBDEVFS_DISCSIGNAL        _IOR('U', 14, struct usbdevfs_disconnectsignal)
#define USBDEVFS_DISCSIGNAL32      _IOR('U', 14, struct usbdevfs_disconnectsignal32)
#define USBDEVFS_CLAIMINTERFACE    _IOR('U', 15, unsigned int)
#define USBDEVFS_RELEASEINTERFACE  _IOR('U', 16, unsigned int)
#define USBDEVFS_CONNECTINFO       _IOW('U', 17, struct usbdevfs_connectinfo)
#define USBDEVFS_IOCTL             _IOWR('U', 18, struct usbdevfs_ioctl)
#define USBDEVFS_IOCTL32           _IOWR('U', 18, struct usbdevfs_ioctl32)
#define USBDEVFS_HUB_PORTINFO      _IOR('U', 19, struct usbdevfs_hub_portinfo)
#define USBDEVFS_RESET             _IO('U', 20)
#define USBDEVFS_CLEAR_HALT        _IOR('U', 21, unsigned int)
#define USBDEVFS_DISCONNECT        _IO('U', 22)
#define USBDEVFS_CONNECT           _IO('U', 23)
#define USBDEVFS_CLAIM_PORT        _IOR('U', 24, unsigned int)
#define USBDEVFS_RELEASE_PORT      _IOR('U', 25, unsigned int)
#define USBDEVFS_GET_CAPABILITIES  _IOR('U', 26, __u32)
#define USBDEVFS_DISCONNECT_CLAIM  _IOR('U', 27, struct usbdevfs_disconnect_claim)
#define USBDEVFS_ALLOC_STREAMS     _IOR('U', 28, struct usbdevfs_streams)
#define USBDEVFS_FREE_STREAMS      _IOR('U', 29, struct usbdevfs_streams)
#define USBDEVFS_DROP_PRIVILEGES   _IOW('U', 30, __u32)
#define USBDEVFS_GET_SPEED         _IO('U', 31)

通过这些方法,可以编程操作USB BUS,实现断开、重启等操作。

reset usb

    #include <stdio.h>
    #include <unistd.h>
    #include <fcntl.h>
    #include <errno.h>
    #include <sys/ioctl.h>
    #include <linux/usbdevice_fs.h>

    int main(int argc, char **argv)
    {
        const char *filename;
        int fd;
        int rc;

        if (argc != 2) {
            fprintf(stderr, "Usage: usbreset device-filename\n");
            return 1;
        }
        filename = argv[1];//表示usb的ID

        fd = open(filename, O_WRONLY);
        if (fd < 0) {
            perror("Error opening output file");
            return 1;
        }

        printf("Resetting USB device %s\n", filename);
        rc = ioctl(fd, USBDEVFS_RESET, 0);// 这里是重启
        if (rc < 0) {
            perror("Error in ioctl");
            return 1;
        }
        printf("Reset successful\n");

        close(fd);
        return 0;
    }

gcc -o reset reset.c
lsusb 发现Quectel 模组 是 Bus 005 Dev 002 执行命令reset usb bus

sudo ./reset /dev/bus/usb/006/002

ubind 断开usb连接

echo '2-1.6' | sudo tee /sys/bus/usb/drivers/usb/unbind