LXR linux/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
   8struct fw_unit;
   9
  10enum 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 */
  25struct 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
  37int cmp_connection_init(struct cmp_connection *connection,
  38                        struct fw_unit *unit,
  39                        enum cmp_direction direction,
  40                        unsigned int pcr_index);
  41int cmp_connection_check_used(struct cmp_connection *connection, bool *used);
  42void cmp_connection_destroy(struct cmp_connection *connection);
  43
  44int cmp_connection_establish(struct cmp_connection *connection,
  45                             unsigned int max_payload);
  46int cmp_connection_update(struct cmp_connection *connection);
  47void cmp_connection_break(struct cmp_connection *connection);
  48
  49#endif
  50