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
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