sound/xen/xen_snd_front.h

   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
  16 struct xen_snd_front_card_info;
  17 struct xen_snd_front_evtchnl;
  18 struct xen_snd_front_evtchnl_pair;
  19 struct xen_front_pgdir_shbuf;
  20 struct xensnd_query_hw_param;
  21
  22 struct 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
  33 int 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
  37 int 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
  43 int xen_snd_front_stream_close(struct xen_snd_front_evtchnl *evtchnl);
  44
  45 int xen_snd_front_stream_write(struct xen_snd_front_evtchnl *evtchnl,
  46                                unsigned long pos, unsigned long count);
  47
  48 int xen_snd_front_stream_read(struct xen_snd_front_evtchnl *evtchnl,
  49                               unsigned long pos, unsigned long count);
  50
  51 int xen_snd_front_stream_trigger(struct xen_snd_front_evtchnl *evtchnl,
  52                                  int type);
  53
  54 #endif /* __XEN_SND_FRONT_H */