1 #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 
7 struct 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  */
17 struct 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;
27 };
28 
29 int fw_iso_resources_init(struct fw_iso_resources *r,
30 			  struct fw_unit *unit);
31 void fw_iso_resources_destroy(struct fw_iso_resources *r);
32 
33 int fw_iso_resources_allocate(struct fw_iso_resources *r,
34 			      unsigned int max_payload_bytes, int speed);
35 int fw_iso_resources_update(struct fw_iso_resources *r);
36 void fw_iso_resources_free(struct fw_iso_resources *r);
37 
38 #endif
39