sound/xen/xen_snd_front.h

0001 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
0002
0003 /*
0004  * Xen para-virtual sound device
0005  *
0006  * Copyright (C) 2016-2018 EPAM Systems Inc.
0007  *
0008  * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
0009  */
0010
0011 #ifndef __XEN_SND_FRONT_H
0012 #define __XEN_SND_FRONT_H
0013
0014 #include "xen_snd_front_cfg.h"
0015
0016 struct xen_snd_front_card_info;
0017 struct xen_snd_front_evtchnl;
0018 struct xen_snd_front_evtchnl_pair;
0019 struct xen_front_pgdir_shbuf;
0020 struct xensnd_query_hw_param;
0021
0022 struct xen_snd_front_info {
0023     struct xenbus_device *xb_dev;
0024
0025     struct xen_snd_front_card_info *card_info;
0026
0027     int num_evt_pairs;
0028     struct xen_snd_front_evtchnl_pair *evt_pairs;
0029
0030     struct xen_front_cfg_card cfg;
0031 };
0032
0033 int xen_snd_front_stream_query_hw_param(struct xen_snd_front_evtchnl *evtchnl,
0034                     struct xensnd_query_hw_param *hw_param_req,
0035                     struct xensnd_query_hw_param *hw_param_resp);
0036
0037 int xen_snd_front_stream_prepare(struct xen_snd_front_evtchnl *evtchnl,
0038                  struct xen_front_pgdir_shbuf *shbuf,
0039                  u8 format, unsigned int channels,
0040                  unsigned int rate, u32 buffer_sz,
0041                  u32 period_sz);
0042
0043 int xen_snd_front_stream_close(struct xen_snd_front_evtchnl *evtchnl);
0044
0045 int xen_snd_front_stream_write(struct xen_snd_front_evtchnl *evtchnl,
0046                    unsigned long pos, unsigned long count);
0047
0048 int xen_snd_front_stream_read(struct xen_snd_front_evtchnl *evtchnl,
0049                   unsigned long pos, unsigned long count);
0050
0051 int xen_snd_front_stream_trigger(struct xen_snd_front_evtchnl *evtchnl,
0052                  int type);
0053
0054 #endif /* __XEN_SND_FRONT_H */