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
 
 
 
 
 
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 */
20struct 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
31int cmp_connection_init(struct cmp_connection *connection,
32			struct fw_unit *unit,
33			unsigned int ipcr_index);
 
 
34void cmp_connection_destroy(struct cmp_connection *connection);
35
36int cmp_connection_establish(struct cmp_connection *connection,
37			     unsigned int max_payload);
38int cmp_connection_update(struct cmp_connection *connection);
 
 
39void cmp_connection_break(struct cmp_connection *connection);
40
41#endif

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef SOUND_FIREWIRE_CMP_H_INCLUDED
 3#define SOUND_FIREWIRE_CMP_H_INCLUDED
 4
 5#include <linux/mutex.h>
 6#include <linux/types.h>
 7#include "iso-resources.h"
 8
 9struct fw_unit;
10
11enum cmp_direction {
12	CMP_INPUT = 0,
13	CMP_OUTPUT,
14};
15
16/**
17 * struct cmp_connection - manages an isochronous connection to a device
18 * @speed: the connection's actual speed
19 *
20 * This structure manages (using CMP) an isochronous stream between the local
21 * computer and a device's input plug (iPCR) and output plug (oPCR).
22 *
23 * There is no corresponding oPCR created on the local computer, so it is not
24 * possible to overlay connections on top of this one.
25 */
26struct cmp_connection {
27	int speed;
28	/* private: */
29	bool connected;
30	struct mutex mutex;
31	struct fw_iso_resources resources;
32	__be32 last_pcr_value;
33	unsigned int pcr_index;
34	unsigned int max_speed;
35	enum cmp_direction direction;
36};
37
38int cmp_connection_init(struct cmp_connection *connection,
39			struct fw_unit *unit,
40			enum cmp_direction direction,
41			unsigned int pcr_index);
42int cmp_connection_check_used(struct cmp_connection *connection, bool *used);
43void cmp_connection_destroy(struct cmp_connection *connection);
44
45int cmp_connection_reserve(struct cmp_connection *connection,
46			   unsigned int max_payload);
47void cmp_connection_release(struct cmp_connection *connection);
48
49int cmp_connection_establish(struct cmp_connection *connection);
50void cmp_connection_break(struct cmp_connection *connection);
51
52#endif