blob: 3f0730e4d84181771067199708f497146762d244 [file] [log] [blame]
Clemens Ladisch31ef9132011-03-15 07:53:21 +01001#ifndef SOUND_FIREWIRE_ISO_RESOURCES_H_INCLUDED
2#define SOUND_FIREWIRE_ISO_RESOURCES_H_INCLUDED
3
4#include <linux/mutex.h>
5#include <linux/types.h>
6
7struct fw_unit;
8
9/**
10 * struct fw_iso_resources - manages channel/bandwidth allocation
11 * @channels_mask: if the device does not support all channel numbers, set this
12 * bit mask to something else than the default (all ones)
13 *
14 * This structure manages (de)allocation of isochronous resources (channel and
15 * bandwidth) for one isochronous stream.
16 */
17struct fw_iso_resources {
18 u64 channels_mask;
19 /* private: */
20 struct fw_unit *unit;
21 struct mutex mutex;
22 unsigned int channel;
23 unsigned int bandwidth; /* in bandwidth units, without overhead */
24 unsigned int bandwidth_overhead;
25 int generation; /* in which allocation is valid */
26 bool allocated;
Clemens Ladisch5b2599a2011-03-15 07:55:50 +010027 __be32 *buffer;
Clemens Ladisch31ef9132011-03-15 07:53:21 +010028};
29
Clemens Ladisch5b2599a2011-03-15 07:55:50 +010030int fw_iso_resources_init(struct fw_iso_resources *r,
31 struct fw_unit *unit);
Clemens Ladisch31ef9132011-03-15 07:53:21 +010032void fw_iso_resources_destroy(struct fw_iso_resources *r);
33
34int fw_iso_resources_allocate(struct fw_iso_resources *r,
35 unsigned int max_payload_bytes, int speed);
36int fw_iso_resources_update(struct fw_iso_resources *r);
37void fw_iso_resources_free(struct fw_iso_resources *r);
38
39#endif