ALSA: firewire-lib: add a kernel API to add AMDTP stream into AMDTP domain

This commit adds a kernel API to insert AMDTP stream to list in AMDTP
domain.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/amdtp-stream.c

@@ -1159,6 +1159,32 @@ void amdtp_domain_destroy(struct amdtp_domain *d)
 }
 EXPORT_SYMBOL_GPL(amdtp_domain_destroy);
 
+/**
+ * amdtp_domain_add_stream - register isoc context into the domain.
+ * @d: the AMDTP domain.
+ * @s: the AMDTP stream.
+ * @channel: the isochronous channel on the bus.
+ * @speed: firewire speed code.
+ */
+int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s,
+			    int channel, int speed)
+{
+	struct amdtp_stream *tmp;
+
+	list_for_each_entry(tmp, &d->streams, list) {
+		if (s == tmp)
+			return -EBUSY;
+	}
+
+	list_add(&s->list, &d->streams);
+
+	s->channel = channel;
+	s->speed = speed;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(amdtp_domain_add_stream);
+
 /**
  * amdtp_domain_stop - stop sending packets for isoc context in the same domain.
  * @d: the AMDTP domain to which the isoc contexts belong.

sound/firewire/amdtp-stream.h

@@ -172,6 +172,8 @@ struct amdtp_stream {
 	amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
 
 	// For domain.
+	int channel;
+	int speed;
 	struct list_head list;
 };
 
@@ -277,6 +279,9 @@ struct amdtp_domain {
 int amdtp_domain_init(struct amdtp_domain *d);
 void amdtp_domain_destroy(struct amdtp_domain *d);
 
+int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s,
+			    int channel, int speed);
+
 void amdtp_domain_stop(struct amdtp_domain *d);
 
 #endif