sound/firewire/cmp.h

   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 /**
  11  * struct cmp_connection - manages an isochronous connection to a device
  12  * @speed: the connection's actual speed
  13  *
  14  * This structure manages (using CMP) an isochronous stream from the local
  15  * computer to a device's input plug (iPCR).
  16  *
  17  * There is no corresponding oPCR created on the local computer, so it is not
  18  * possible to overlay connections on top of this one.
  19  */
  20 struct cmp_connection {
  21         int speed;
  22         /* private: */
  23         bool connected;
  24         struct mutex mutex;
  25         struct fw_iso_resources resources;
  26         __be32 last_pcr_value;
  27         unsigned int pcr_index;
  28         unsigned int max_speed;
  29 };
  30
  31 int cmp_connection_init(struct cmp_connection *connection,
  32                         struct fw_unit *unit,
  33                         unsigned int ipcr_index);
  34 void cmp_connection_destroy(struct cmp_connection *connection);
  35
  36 int cmp_connection_establish(struct cmp_connection *connection,
  37                              unsigned int max_payload);
  38 int cmp_connection_update(struct cmp_connection *connection);
  39 void cmp_connection_break(struct cmp_connection *connection);
  40
  41 #endif