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authorOleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>2018-05-14 09:27:41 +0300
committerTakashi Iwai <tiwai@suse.de>2018-05-16 12:59:57 +0200
commit1cee559351a7cb57b405554bac10a6f33c28ed09 (patch)
tree13c0dc77c467e9e69681ac2138a5396a29f40924 /sound/xen/xen_snd_front.h
parentd6e0fbb82e73a01e4cb3631b8b3dd7aae09ab14c (diff)
downloadlinux-1cee559351a7cb57b405554bac10a6f33c28ed09.tar.bz2
ALSA: xen-front: Implement ALSA virtual sound driver
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>
Diffstat (limited to 'sound/xen/xen_snd_front.h')
-rw-r--r--sound/xen/xen_snd_front.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/sound/xen/xen_snd_front.h b/sound/xen/xen_snd_front.h
index 9d0c92100c7b..a2ea2463bcc5 100644
--- a/sound/xen/xen_snd_front.h
+++ b/sound/xen/xen_snd_front.h
@@ -13,15 +13,42 @@
#include "xen_snd_front_cfg.h"
+struct xen_snd_front_card_info;
+struct xen_snd_front_evtchnl;
struct xen_snd_front_evtchnl_pair;
+struct xen_snd_front_shbuf;
+struct xensnd_query_hw_param;
struct xen_snd_front_info {
struct xenbus_device *xb_dev;
+ struct xen_snd_front_card_info *card_info;
+
int num_evt_pairs;
struct xen_snd_front_evtchnl_pair *evt_pairs;
struct xen_front_cfg_card cfg;
};
+int xen_snd_front_stream_query_hw_param(struct xen_snd_front_evtchnl *evtchnl,
+ struct xensnd_query_hw_param *hw_param_req,
+ struct xensnd_query_hw_param *hw_param_resp);
+
+int xen_snd_front_stream_prepare(struct xen_snd_front_evtchnl *evtchnl,
+ struct xen_snd_front_shbuf *sh_buf,
+ u8 format, unsigned int channels,
+ unsigned int rate, u32 buffer_sz,
+ u32 period_sz);
+
+int xen_snd_front_stream_close(struct xen_snd_front_evtchnl *evtchnl);
+
+int xen_snd_front_stream_write(struct xen_snd_front_evtchnl *evtchnl,
+ unsigned long pos, unsigned long count);
+
+int xen_snd_front_stream_read(struct xen_snd_front_evtchnl *evtchnl,
+ unsigned long pos, unsigned long count);
+
+int xen_snd_front_stream_trigger(struct xen_snd_front_evtchnl *evtchnl,
+ int type);
+
#endif /* __XEN_SND_FRONT_H */