LXR linux/sound/xen/xen_snd

   1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
   2
   3/*
   4 * Xen para-virtual sound device
   5 *
   6 * Copyright (C) 2016-2018 EPAM Systems Inc.
   7 *
   8 * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
   9 */
  10
  11#ifndef __XEN_SND_FRONT_H
  12#define __XEN_SND_FRONT_H
  13
  14#include "xen_snd_front_cfg.h"
  15
  16struct xen_snd_front_card_info;
  17struct xen_snd_front_evtchnl;
  18struct xen_snd_front_evtchnl_pair;
  19struct xen_front_pgdir_shbuf;
  20struct xensnd_query_hw_param;
  21
  22struct xen_snd_front_info {
  23        struct xenbus_device *xb_dev;
  24
  25        struct xen_snd_front_card_info *card_info;
  26
  27        int num_evt_pairs;
  28        struct xen_snd_front_evtchnl_pair *evt_pairs;
  29
  30        struct xen_front_cfg_card cfg;
  31};
  32
  33int xen_snd_front_stream_query_hw_param(struct xen_snd_front_evtchnl *evtchnl,
  34                                        struct xensnd_query_hw_param *hw_param_req,
  35                                        struct xensnd_query_hw_param *hw_param_resp);
  36
  37int xen_snd_front_stream_prepare(struct xen_snd_front_evtchnl *evtchnl,
  38                                 struct xen_front_pgdir_shbuf *shbuf,
  39                                 u8 format, unsigned int channels,
  40                                 unsigned int rate, u32 buffer_sz,
  41                                 u32 period_sz);
  42
  43int xen_snd_front_stream_close(struct xen_snd_front_evtchnl *evtchnl);
  44
  45int xen_snd_front_stream_write(struct xen_snd_front_evtchnl *evtchnl,
  46                               unsigned long pos, unsigned long count);
  47
  48int xen_snd_front_stream_read(struct xen_snd_front_evtchnl *evtchnl,
  49                              unsigned long pos, unsigned long count);
  50
  51int xen_snd_front_stream_trigger(struct xen_snd_front_evtchnl *evtchnl,
  52                                 int type);
  53
  54#endif /* __XEN_SND_FRONT_H */
  55