ALSA: firewire-lib: add a kernel API to start AMDTP streams in AMDTP domain
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>
diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
index fa7989e..158d210 100644
--- a/sound/firewire/amdtp-stream.c
+++ b/sound/firewire/amdtp-stream.c
@@ -1186,6 +1186,30 @@ int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s,
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.
* @d: the AMDTP domain to which the isoc contexts belong.
*/
