#ifndef SOUND_FIREWIRE_CMP_H_INCLUDED
  #define SOUND_FIREWIRE_CMP_H_INCLUDED
  
  #include <linux/mutex.h>
  #include <linux/types.h>
  #include "iso-resources.h"
  
  struct fw_unit;

  enum cmp_direction {
  	CMP_INPUT = 0,
  	CMP_OUTPUT,
  };

  /**
   * struct cmp_connection - manages an isochronous connection to a device
   * @speed: the connection's actual speed
   *

   * This structure manages (using CMP) an isochronous stream between the local
   * computer and a device's input plug (iPCR) and output plug (oPCR).

   *
   * There is no corresponding oPCR created on the local computer, so it is not
   * possible to overlay connections on top of this one.
   */
  struct cmp_connection {
  	int speed;
  	/* private: */
  	bool connected;
  	struct mutex mutex;
  	struct fw_iso_resources resources;
  	__be32 last_pcr_value;
  	unsigned int pcr_index;
  	unsigned int max_speed;

  	enum cmp_direction direction;

  };
  
  int cmp_connection_init(struct cmp_connection *connection,
  			struct fw_unit *unit,

  			enum cmp_direction direction,

  			unsigned int pcr_index);

  int cmp_connection_check_used(struct cmp_connection *connection, bool *used);

  void cmp_connection_destroy(struct cmp_connection *connection);
  
  int cmp_connection_establish(struct cmp_connection *connection,
  			     unsigned int max_payload);
  int cmp_connection_update(struct cmp_connection *connection);
  void cmp_connection_break(struct cmp_connection *connection);
  
  #endif