fusb_linux.h

嵌入式开发板USB测试

/* -*- c++ -*- */ 
/* 
 * Copyright 2003 Free Software Foundation, Inc. 
 *  
 * This file is part of GNU Radio 
 *  
 * GNU Radio is free software; you can redistribute it and/or modify 
 * it under the terms of the GNU General Public License as published by 
 * the Free Software Foundation; either version 3, or (at your option) 
  * any later version. 
  *  
  * GNU Radio is distributed in the hope that it will be useful, 
  * but WITHOUT ANY WARRANTY; without even the implied warranty of 
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
  * GNU General Public License for more details. 
  *  
  * You should have received a copy of the GNU General Public License 
  * along with GNU Radio; see the file COPYING.  If not, write to 
  * the Free Software Foundation, Inc., 51 Franklin Street, 
  * Boston, MA 02110-1301, USA. 
  */ 
  
 // Fast USB interface 
  
 #ifndef _FUSB_LINUX_H_ 
 #define _FUSB_LINUX_H_ 
  
 #include <fusb.h> 
 #include <list> 
  
 struct  usbdevfs_urb; 
 class   fusb_ephandle_linux; 
  
 /*! 
  * \brief linux specific implementation of fusb_devhandle using usbdevice_fs 
  */ 
 class fusb_devhandle_linux : public fusb_devhandle { 
 private: 
   std::list<usbdevfs_urb*>       d_pending_rqsts; 
  
   void pending_add (usbdevfs_urb *urb); 
   bool pending_remove (usbdevfs_urb *urb); 
   usbdevfs_urb * pending_get (); 
  
  
 public: 
   // CREATORS 
   fusb_devhandle_linux (usb_dev_handle *udh); 
   virtual ~fusb_devhandle_linux (); 
  
   // MANIPULATORS 
   virtual fusb_ephandle *make_ephandle (int endpoint, bool input_p, 
                                         int block_size = 0, int nblocks = 0); 
  
   // internal use only 
   bool _submit_urb (usbdevfs_urb *urb); 
   bool _cancel_urb (usbdevfs_urb *urb); 
   void _cancel_pending_rqsts (fusb_ephandle_linux *eph); 
   bool _reap (bool ok_to_block_p); 
   void _wait_for_completion (); 
 }; 
  
 /*! 
  * \brief linux specific implementation of fusb_ephandle using usbdevice_fs 
  */ 
  
 class fusb_ephandle_linux : public fusb_ephandle { 
 private: 
   fusb_devhandle_linux         *d_devhandle; 
   std::list<usbdevfs_urb*>      d_free_list; 
   std::list<usbdevfs_urb*>      d_completed_list; 
   usbdevfs_urb                 *d_write_work_in_progress; 
   unsigned char                *d_write_buffer; 
   usbdevfs_urb                 *d_read_work_in_progress; 
   unsigned char                *d_read_buffer; 
   unsigned char                *d_read_buffer_end; 
  
   usbdevfs_urb *get_write_work_in_progress (); 
   void reap_complete_writes (); 
   bool reload_read_buffer (); 
   bool submit_urb (usbdevfs_urb *urb); 
    
 public: 
   fusb_ephandle_linux (fusb_devhandle_linux *dh, int endpoint, bool input_p, 
                        int block_size = 0, int nblocks = 0); 
   virtual ~fusb_ephandle_linux (); 
  
   virtual bool start ();        //!< begin streaming i/o 
   virtual bool stop ();         //!< stop streaming i/o 
  
    /*! 
    * \returns \p nbytes if write was successfully enqueued, else -1. 
    * Will block if no free buffers available. 
    */ 
   virtual int write (const void *buffer, int nbytes); 
  
   /*! 
    * \returns number of bytes read or -1 if error. 
    * number of bytes read will be <= nbytes. 
   * Will block if no input available. 
   */ 
  virtual int read (void *buffer, int nbytes); 
 
  /* 
   * block until all outstanding writes have completed 
   */ 
  virtual void wait_for_completion (); 
 
  // internal use only 
  void free_list_add (usbdevfs_urb *urb); 
  void completed_list_add (usbdevfs_urb *urb); 
  usbdevfs_urb *free_list_get ();       // pop and return head of list or 0 
  usbdevfs_urb *completed_list_get ();  // pop and return head of list or 0 
}; 
 
#endif /* _FUSB_LINUX_H_ */