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author | Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> | 2018-05-14 09:27:41 +0300 |
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committer | Takashi Iwai <tiwai@suse.de> | 2018-05-16 12:59:57 +0200 |
commit | 1cee559351a7cb57b405554bac10a6f33c28ed09 (patch) | |
tree | 13c0dc77c467e9e69681ac2138a5396a29f40924 /sound/xen/xen_snd_front_evtchnl.c | |
parent | d6e0fbb82e73a01e4cb3631b8b3dd7aae09ab14c (diff) | |
download | linux-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_evtchnl.c')
-rw-r--r-- | sound/xen/xen_snd_front_evtchnl.c | 4 |
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; } } |