LXR linux/sound/firewire/iso-resources.h

   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
   8struct 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 */
  18struct 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
  30int fw_iso_resources_init(struct fw_iso_resources *r,
  31                          struct fw_unit *unit);
  32void 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
  40