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