Hi all
        I want to get the usb printer 's device_id_string, by sending the request:
        usb_control_msg(usbdev,
                                                        0xa1, //request type
                                                        0,    //request
                                                        0,    //wvalue
                                                        0,    //wIndex
                                                        deviceid,     //string 
contains the id string
                                                        sizeof(deviceid), //size
                                                        1000            //timeout
                                );

        but it faild by return the errno 16 which shows that the device or source busy.

        I only open the device and then do this control, why it complains that device 
busy?
        
        Thanks in advance!



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