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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
31ef9134 CL |
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 | ||
c68a1c65 TS |
11 | enum cmp_direction { |
12 | CMP_INPUT = 0, | |
13 | CMP_OUTPUT, | |
14 | }; | |
15 | ||
31ef9134 CL |
16 | /** |
17 | * struct cmp_connection - manages an isochronous connection to a device | |
18 | * @speed: the connection's actual speed | |
19 | * | |
a7fa0d04 TS |
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). | |
31ef9134 CL |
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; | |
c68a1c65 | 35 | enum cmp_direction direction; |
31ef9134 CL |
36 | }; |
37 | ||
38 | int cmp_connection_init(struct cmp_connection *connection, | |
39 | struct fw_unit *unit, | |
c68a1c65 | 40 | enum cmp_direction direction, |
a7fa0d04 | 41 | unsigned int pcr_index); |
b04479fb | 42 | int cmp_connection_check_used(struct cmp_connection *connection, bool *used); |
31ef9134 CL |
43 | void cmp_connection_destroy(struct cmp_connection *connection); |
44 | ||
7bc93821 TS |
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); | |
31ef9134 CL |
50 | int cmp_connection_update(struct cmp_connection *connection); |
51 | void cmp_connection_break(struct cmp_connection *connection); | |
52 | ||
53 | #endif |