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