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
9 struct fw_unit;
10
11 enum 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 */
26 struct 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
38 int cmp_connection_init(struct cmp_connection *connection,
39 struct fw_unit *unit,
40 enum cmp_direction direction,
41 unsigned int pcr_index);
42 int cmp_connection_check_used(struct cmp_connection *connection, bool *used);
43 void cmp_connection_destroy(struct cmp_connection *connection);
44
45 int cmp_connection_reserve(struct cmp_connection *connection,
46 unsigned int max_payload);
47 void cmp_connection_release(struct cmp_connection *connection);
48
49 int cmp_connection_establish(struct cmp_connection *connection);
50 int cmp_connection_update(struct cmp_connection *connection);
51 void cmp_connection_break(struct cmp_connection *connection);
52
53 #endif
54
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.