sound/firewire/iso-resources.h

   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         __be32 buffer[2];
  28 };
  29
  30 void 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