xref: /linux/sound/firewire/iso-resources.h (revision 498495dba268b20e8eadd7fe93c140c68b6cc9d2)
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