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TOMOYO Linux Cross Reference
Linux/sound/firewire/cmp.h

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  1 #ifndef SOUND_FIREWIRE_CMP_H_INCLUDED
  2 #define SOUND_FIREWIRE_CMP_H_INCLUDED
  3 
  4 #include <linux/mutex.h>
  5 #include <linux/types.h>
  6 #include "iso-resources.h"
  7 
  8 struct fw_unit;
  9 
 10 enum cmp_direction {
 11         CMP_INPUT = 0,
 12         CMP_OUTPUT,
 13 };
 14 
 15 /**
 16  * struct cmp_connection - manages an isochronous connection to a device
 17  * @speed: the connection's actual speed
 18  *
 19  * This structure manages (using CMP) an isochronous stream between the local
 20  * computer and a device's input plug (iPCR) and output plug (oPCR).
 21  *
 22  * There is no corresponding oPCR created on the local computer, so it is not
 23  * possible to overlay connections on top of this one.
 24  */
 25 struct cmp_connection {
 26         int speed;
 27         /* private: */
 28         bool connected;
 29         struct mutex mutex;
 30         struct fw_iso_resources resources;
 31         __be32 last_pcr_value;
 32         unsigned int pcr_index;
 33         unsigned int max_speed;
 34         enum cmp_direction direction;
 35 };
 36 
 37 int cmp_connection_init(struct cmp_connection *connection,
 38                         struct fw_unit *unit,
 39                         enum cmp_direction direction,
 40                         unsigned int pcr_index);
 41 int cmp_connection_check_used(struct cmp_connection *connection, bool *used);
 42 void cmp_connection_destroy(struct cmp_connection *connection);
 43 
 44 int cmp_connection_establish(struct cmp_connection *connection,
 45                              unsigned int max_payload);
 46 int cmp_connection_update(struct cmp_connection *connection);
 47 void cmp_connection_break(struct cmp_connection *connection);
 48 
 49 #endif
 50 

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