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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/sound/xen/xen_snd_front.h
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/* SPDX-License-Identifier: GPL-2.0 OR MIT */

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/*

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 * Xen para-virtual sound device

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 *

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 * Copyright (C) 2016-2018 EPAM Systems Inc.

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 *

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 * Author: Oleksandr Andrushchenko <[email protected]>

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 */

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#ifndef __XEN_SND_FRONT_H

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#define __XEN_SND_FRONT_H

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#include "xen_snd_front_cfg.h"

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struct xen_snd_front_card_info;

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struct xen_snd_front_evtchnl;

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struct xen_snd_front_evtchnl_pair;

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struct xen_front_pgdir_shbuf;

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struct xensnd_query_hw_param;

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struct xen_snd_front_info {

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	struct xenbus_device *xb_dev;

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	struct xen_snd_front_card_info *card_info;

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	int num_evt_pairs;

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	struct xen_snd_front_evtchnl_pair *evt_pairs;

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	struct xen_front_cfg_card cfg;

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};

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int xen_snd_front_stream_query_hw_param(struct xen_snd_front_evtchnl *evtchnl,

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					struct xensnd_query_hw_param *hw_param_req,

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					struct xensnd_query_hw_param *hw_param_resp);

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int xen_snd_front_stream_prepare(struct xen_snd_front_evtchnl *evtchnl,

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				 struct xen_front_pgdir_shbuf *shbuf,

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				 u8 format, unsigned int channels,

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				 unsigned int rate, u32 buffer_sz,

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				 u32 period_sz);

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int xen_snd_front_stream_close(struct xen_snd_front_evtchnl *evtchnl);

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int xen_snd_front_stream_write(struct xen_snd_front_evtchnl *evtchnl,

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			       unsigned long pos, unsigned long count);

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int xen_snd_front_stream_read(struct xen_snd_front_evtchnl *evtchnl,

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			      unsigned long pos, unsigned long count);

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int xen_snd_front_stream_trigger(struct xen_snd_front_evtchnl *evtchnl,

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				 int type);

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#endif /* __XEN_SND_FRONT_H */

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