mirror of
https://gitee.com/openharmony/kernel_linux
synced 2024-11-30 08:41:45 +00:00
1cee559351
Implement essential initialization of the sound driver:
- introduce required data structures
- handle driver registration
- handle sound card registration
- register sound driver on backend connection
- remove sound driver on backend disconnect
Initialize virtual sound card with streams according to the
Xen store configuration.
Implement ALSA driver operations including:
- manage frontend/backend shared buffers
- manage Xen bus event channel states
Implement requests from front to back for ALSA
PCM operations.
- report ALSA period elapsed event: handle XENSND_EVT_CUR_POS
notifications from the backend when stream position advances
during playback/capture. The event carries a value of how
many octets were played/captured at the time of the event.
- implement explicit stream parameter negotiation between
backend and frontend: handle XENSND_OP_HW_PARAM_QUERY request
to read/update configuration space for the parameter given:
request passes desired parameter interval and the response to
this request returns min/max interval for the parameter to be used.
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
24 lines
581 B
C
24 lines
581 B
C
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
|
|
|
|
/*
|
|
* Xen para-virtual sound device
|
|
*
|
|
* Copyright (C) 2016-2018 EPAM Systems Inc.
|
|
*
|
|
* Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
|
|
*/
|
|
|
|
#ifndef __XEN_SND_FRONT_ALSA_H
|
|
#define __XEN_SND_FRONT_ALSA_H
|
|
|
|
struct xen_snd_front_info;
|
|
|
|
int xen_snd_front_alsa_init(struct xen_snd_front_info *front_info);
|
|
|
|
void xen_snd_front_alsa_fini(struct xen_snd_front_info *front_info);
|
|
|
|
void xen_snd_front_alsa_handle_cur_pos(struct xen_snd_front_evtchnl *evtchnl,
|
|
u64 pos_bytes);
|
|
|
|
#endif /* __XEN_SND_FRONT_ALSA_H */
|