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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 13:59:57 +0300
commit1cee559351a7cb57b405554bac10a6f33c28ed09 (patch)
tree13c0dc77c467e9e69681ac2138a5396a29f40924 /sound/xen/xen_snd_front_evtchnl.c
parentd6e0fbb82e73a01e4cb3631b8b3dd7aae09ab14c (diff)
downloadlinux-1cee559351a7cb57b405554bac10a6f33c28ed09.tar.xz
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_evtchnl.c')
-rw-r--r--sound/xen/xen_snd_front_evtchnl.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/sound/xen/xen_snd_front_evtchnl.c b/sound/xen/xen_snd_front_evtchnl.c
index 1faafff08807..d70a62e7f910 100644
--- a/sound/xen/xen_snd_front_evtchnl.c
+++ b/sound/xen/xen_snd_front_evtchnl.c
@@ -14,6 +14,7 @@
#include <xen/xenbus.h>
#include "xen_snd_front.h"
+#include "xen_snd_front_alsa.h"
#include "xen_snd_front_cfg.h"
#include "xen_snd_front_evtchnl.h"
@@ -118,7 +119,8 @@ static irqreturn_t evtchnl_interrupt_evt(int irq, void *dev_id)
switch (event->type) {
case XENSND_EVT_CUR_POS:
- /* Do nothing at the moment. */
+ xen_snd_front_alsa_handle_cur_pos(channel,
+ event->op.cur_pos.position);
break;
}
}