54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#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_reserve(struct cmp_connection *connection,
|
|
unsigned int max_payload);
|
|
void cmp_connection_release(struct cmp_connection *connection);
|
|
|
|
int cmp_connection_establish(struct cmp_connection *connection);
|
|
int cmp_connection_update(struct cmp_connection *connection);
|
|
void cmp_connection_break(struct cmp_connection *connection);
|
|
|
|
#endif
|