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ALSA: firewire-lib: add a kernel API to start AMDTP streams in AMDTP domain

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This commit adds a kernel API to start a couple of isochronous contexts
for some AMDTP streams.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2019-08-04 15:21:23 +09:00 committed by Takashi Iwai
parent 157a53eef6
commit 9b4702b06c
2 changed files with 25 additions and 0 deletions
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24
sound/firewire/amdtp-stream.c
View File

@ -1185,6 +1185,30 @@ int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s,
} }
EXPORT_SYMBOL_GPL(amdtp_domain_add_stream); EXPORT_SYMBOL_GPL(amdtp_domain_add_stream);
/**
* amdtp_domain_start - start sending packets for isoc context in the domain.
* @d: the AMDTP domain.
*/
int amdtp_domain_start(struct amdtp_domain *d)
{
struct amdtp_stream *s;
int err = 0;
list_for_each_entry(s, &d->streams, list) {
err = amdtp_stream_start(s, s->channel, s->speed);
if (err < 0)
break;
}
if (err < 0) {
list_for_each_entry(s, &d->streams, list)
amdtp_stream_stop(s);
}
return err;
}
EXPORT_SYMBOL_GPL(amdtp_domain_start);
/** /**
* amdtp_domain_stop - stop sending packets for isoc context in the same domain. * amdtp_domain_stop - stop sending packets for isoc context in the same domain.
* @d: the AMDTP domain to which the isoc contexts belong. * @d: the AMDTP domain to which the isoc contexts belong.

1
sound/firewire/amdtp-stream.h
View File

@ -282,6 +282,7 @@ void amdtp_domain_destroy(struct amdtp_domain *d);
int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s, int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s,
int channel, int speed); int channel, int speed);
int amdtp_domain_start(struct amdtp_domain *d);
void amdtp_domain_stop(struct amdtp_domain *d); void amdtp_domain_stop(struct amdtp_domain *d);
#endif #endif