1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef SOUND_FIREWIRE_ISO_RESOURCES_H_INCLUDED |
3 | #define SOUND_FIREWIRE_ISO_RESOURCES_H_INCLUDED |
4 | |
5 | #include <linux/mutex.h> |
6 | #include <linux/types.h> |
7 | |
8 | struct fw_unit; |
9 | |
10 | /** |
11 | * struct fw_iso_resources - manages channel/bandwidth allocation |
12 | * @channels_mask: if the device does not support all channel numbers, set this |
13 | * bit mask to something else than the default (all ones) |
14 | * |
15 | * This structure manages (de)allocation of isochronous resources (channel and |
16 | * bandwidth) for one isochronous stream. |
17 | */ |
18 | struct fw_iso_resources { |
19 | u64 channels_mask; |
20 | /* private: */ |
21 | struct fw_unit *unit; |
22 | struct mutex mutex; |
23 | unsigned int channel; |
24 | unsigned int bandwidth; /* in bandwidth units, without overhead */ |
25 | unsigned int bandwidth_overhead; |
26 | int generation; /* in which allocation is valid */ |
27 | bool allocated; |
28 | }; |
29 | |
30 | int fw_iso_resources_init(struct fw_iso_resources *r, |
31 | struct fw_unit *unit); |
32 | void fw_iso_resources_destroy(struct fw_iso_resources *r); |
33 | |
34 | int fw_iso_resources_allocate(struct fw_iso_resources *r, |
35 | unsigned int max_payload_bytes, int speed); |
36 | int fw_iso_resources_update(struct fw_iso_resources *r); |
37 | void fw_iso_resources_free(struct fw_iso_resources *r); |
38 | |
39 | #endif |
40 | |