/* 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 <oleksandr_andrushchenko@epam.com>
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*/
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#ifndef __XEN_SND_FRONT_EVTCHNL_H
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#define __XEN_SND_FRONT_EVTCHNL_H
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#include <xen/interface/io/sndif.h>
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struct xen_snd_front_info;
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#ifndef GRANT_INVALID_REF
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/*
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* FIXME: usage of grant reference 0 as invalid grant reference:
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* grant reference 0 is valid, but never exposed to a PV driver,
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* because of the fact it is already in use/reserved by the PV console.
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*/
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#define GRANT_INVALID_REF 0
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#endif
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/* Timeout in ms to wait for backend to respond. */
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#define VSND_WAIT_BACK_MS 3000
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enum xen_snd_front_evtchnl_state {
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EVTCHNL_STATE_DISCONNECTED,
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EVTCHNL_STATE_CONNECTED,
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};
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enum xen_snd_front_evtchnl_type {
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EVTCHNL_TYPE_REQ,
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EVTCHNL_TYPE_EVT,
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};
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struct xen_snd_front_evtchnl {
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struct xen_snd_front_info *front_info;
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int gref;
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int port;
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int irq;
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int index;
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/* State of the event channel. */
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enum xen_snd_front_evtchnl_state state;
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enum xen_snd_front_evtchnl_type type;
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/* Either response id or incoming event id. */
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u16 evt_id;
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/* Next request id or next expected event id. */
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u16 evt_next_id;
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/* Shared ring access lock. */
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struct mutex ring_io_lock;
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union {
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struct {
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struct xen_sndif_front_ring ring;
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struct completion completion;
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/* Serializer for backend IO: request/response. */
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struct mutex req_io_lock;
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/* Latest response status. */
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int resp_status;
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union {
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struct xensnd_query_hw_param hw_param;
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} resp;
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} req;
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struct {
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struct xensnd_event_page *page;
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/* This is needed to handle XENSND_EVT_CUR_POS event. */
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struct snd_pcm_substream *substream;
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} evt;
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} u;
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};
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struct xen_snd_front_evtchnl_pair {
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struct xen_snd_front_evtchnl req;
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struct xen_snd_front_evtchnl evt;
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};
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int xen_snd_front_evtchnl_create_all(struct xen_snd_front_info *front_info,
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int num_streams);
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void xen_snd_front_evtchnl_free_all(struct xen_snd_front_info *front_info);
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int xen_snd_front_evtchnl_publish_all(struct xen_snd_front_info *front_info);
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void xen_snd_front_evtchnl_flush(struct xen_snd_front_evtchnl *evtchnl);
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void xen_snd_front_evtchnl_pair_set_connected(struct xen_snd_front_evtchnl_pair *evt_pair,
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bool is_connected);
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void xen_snd_front_evtchnl_pair_clear(struct xen_snd_front_evtchnl_pair *evt_pair);
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#endif /* __XEN_SND_FRONT_EVTCHNL_H */
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