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 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