diff --git a/sound/firewire/motu/motu-pcm.c b/sound/firewire/motu/motu-pcm.c
index 2d41a1a4052c..b24bb870388e 100644
--- a/sound/firewire/motu/motu-pcm.c
+++ b/sound/firewire/motu/motu-pcm.c
@@ -133,7 +133,6 @@ static int init_hw_info(struct snd_motu *motu,
 static int pcm_open(struct snd_pcm_substream *substream)
 {
 	struct snd_motu *motu = substream->private_data;
-	const struct snd_motu_protocol *const protocol = motu->spec->protocol;
 	struct amdtp_domain *d = &motu->domain;
 	enum snd_motu_clock_source src;
 	int err;
@@ -152,7 +151,7 @@ static int pcm_open(struct snd_pcm_substream *substream)
 	if (err < 0)
 		goto err_locked;
 
-	err = protocol->get_clock_source(motu, &src);
+	err = snd_motu_protocol_get_clock_source(motu, &src);
 	if (err < 0)
 		goto err_locked;
 
@@ -166,7 +165,7 @@ static int pcm_open(struct snd_pcm_substream *substream)
 		unsigned int frames_per_buffer = d->events_per_buffer;
 		unsigned int rate;
 
-		err = protocol->get_clock_rate(motu, &rate);
+		err = snd_motu_protocol_get_clock_rate(motu, &rate);
 		if (err < 0)
 			goto err_locked;
 
diff --git a/sound/firewire/motu/motu-proc.c b/sound/firewire/motu/motu-proc.c
index 187f6abd878c..71d02602d84d 100644
--- a/sound/firewire/motu/motu-proc.c
+++ b/sound/firewire/motu/motu-proc.c
@@ -28,13 +28,12 @@ static void proc_read_clock(struct snd_info_entry *entry,
 {
 
 	struct snd_motu *motu = entry->private_data;
-	const struct snd_motu_protocol *const protocol = motu->spec->protocol;
 	unsigned int rate;
 	enum snd_motu_clock_source source;
 
-	if (protocol->get_clock_rate(motu, &rate) < 0)
+	if (snd_motu_protocol_get_clock_rate(motu, &rate) < 0)
 		return;
-	if (protocol->get_clock_source(motu, &source) < 0)
+	if (snd_motu_protocol_get_clock_source(motu, &source) < 0)
 		return;
 
 	snd_iprintf(buffer, "Rate:\t%d\n", rate);
@@ -45,12 +44,11 @@ static void proc_read_format(struct snd_info_entry *entry,
 			     struct snd_info_buffer *buffer)
 {
 	struct snd_motu *motu = entry->private_data;
-	const struct snd_motu_protocol *const protocol = motu->spec->protocol;
 	unsigned int mode;
 	struct snd_motu_packet_format *formats;
 	int i;
 
-	if (protocol->cache_packet_formats(motu) < 0)
+	if (snd_motu_protocol_cache_packet_formats(motu) < 0)
 		return;
 
 	snd_iprintf(buffer, "tx:\tmsg\tfixed\tdiffered\n");
diff --git a/sound/firewire/motu/motu-protocol-v2.c b/sound/firewire/motu/motu-protocol-v2.c
index 2cd710a7c792..26534ed97fbc 100644
--- a/sound/firewire/motu/motu-protocol-v2.c
+++ b/sound/firewire/motu/motu-protocol-v2.c
@@ -35,7 +35,8 @@ static int get_clock_rate(u32 data, unsigned int *rate)
 	return 0;
 }
 
-static int v2_get_clock_rate(struct snd_motu *motu, unsigned int *rate)
+int snd_motu_protocol_v2_get_clock_rate(struct snd_motu *motu,
+					unsigned int *rate)
 {
 	__be32 reg;
 	int err;
@@ -48,7 +49,8 @@ static int v2_get_clock_rate(struct snd_motu *motu, unsigned int *rate)
 	return get_clock_rate(be32_to_cpu(reg), rate);
 }
 
-static int v2_set_clock_rate(struct snd_motu *motu, unsigned int rate)
+int snd_motu_protocol_v2_set_clock_rate(struct snd_motu *motu,
+					unsigned int rate)
 {
 	__be32 reg;
 	u32 data;
@@ -122,8 +124,8 @@ static int get_clock_source(struct snd_motu *motu, u32 data,
 	return 0;
 }
 
-static int v2_get_clock_source(struct snd_motu *motu,
-			       enum snd_motu_clock_source *src)
+int snd_motu_protocol_v2_get_clock_source(struct snd_motu *motu,
+					  enum snd_motu_clock_source *src)
 {
 	__be32 reg;
 	int err;
@@ -136,7 +138,8 @@ static int v2_get_clock_source(struct snd_motu *motu,
 	return get_clock_source(motu, be32_to_cpu(reg), src);
 }
 
-static int v2_switch_fetching_mode(struct snd_motu *motu, bool enable)
+int snd_motu_protocol_v2_switch_fetching_mode(struct snd_motu *motu,
+					      bool enable)
 {
 	enum snd_motu_clock_source src;
 	__be32 reg;
@@ -265,7 +268,7 @@ static void calculate_differed_part(struct snd_motu_packet_format *formats,
 	formats->differed_part_pcm_chunks[1] = pcm_chunks[1];
 }
 
-static int v2_cache_packet_formats(struct snd_motu *motu)
+int snd_motu_protocol_v2_cache_packet_formats(struct snd_motu *motu)
 {
 	__be32 reg;
 	u32 data;
@@ -294,11 +297,6 @@ static int v2_cache_packet_formats(struct snd_motu *motu)
 }
 
 static const struct snd_motu_protocol snd_motu_protocol_v2 = {
-	.get_clock_rate		= v2_get_clock_rate,
-	.set_clock_rate		= v2_set_clock_rate,
-	.get_clock_source	= v2_get_clock_source,
-	.switch_fetching_mode	= v2_switch_fetching_mode,
-	.cache_packet_formats	= v2_cache_packet_formats,
 };
 
 const struct snd_motu_spec snd_motu_spec_828mk2 = {
diff --git a/sound/firewire/motu/motu-protocol-v3.c b/sound/firewire/motu/motu-protocol-v3.c
index 548c97752cb8..d8b42d28304a 100644
--- a/sound/firewire/motu/motu-protocol-v3.c
+++ b/sound/firewire/motu/motu-protocol-v3.c
@@ -24,7 +24,8 @@
 #define  V3_NO_ADAT_OPT_OUT_IFACE_A	0x00040000
 #define  V3_NO_ADAT_OPT_OUT_IFACE_B	0x00400000
 
-static int v3_get_clock_rate(struct snd_motu *motu, unsigned int *rate)
+int snd_motu_protocol_v3_get_clock_rate(struct snd_motu *motu,
+					unsigned int *rate)
 {
 	__be32 reg;
 	u32 data;
@@ -45,7 +46,8 @@ static int v3_get_clock_rate(struct snd_motu *motu, unsigned int *rate)
 	return 0;
 }
 
-static int v3_set_clock_rate(struct snd_motu *motu, unsigned int rate)
+int snd_motu_protocol_v3_set_clock_rate(struct snd_motu *motu,
+					unsigned int rate)
 {
 	__be32 reg;
 	u32 data;
@@ -85,8 +87,8 @@ static int v3_set_clock_rate(struct snd_motu *motu, unsigned int rate)
 	return 0;
 }
 
-static int v3_get_clock_source(struct snd_motu *motu,
-			       enum snd_motu_clock_source *src)
+int snd_motu_protocol_v3_get_clock_source(struct snd_motu *motu,
+					  enum snd_motu_clock_source *src)
 {
 	__be32 reg;
 	u32 data;
@@ -133,7 +135,8 @@ static int v3_get_clock_source(struct snd_motu *motu,
 	return 0;
 }
 
-static int v3_switch_fetching_mode(struct snd_motu *motu, bool enable)
+int snd_motu_protocol_v3_switch_fetching_mode(struct snd_motu *motu,
+					      bool enable)
 {
 	__be32 reg;
 	u32 data;
@@ -275,7 +278,7 @@ static void calculate_differed_part(struct snd_motu_packet_format *formats,
 	}
 }
 
-static int v3_cache_packet_formats(struct snd_motu *motu)
+int snd_motu_protocol_v3_cache_packet_formats(struct snd_motu *motu)
 {
 	__be32 reg;
 	u32 data;
@@ -308,11 +311,6 @@ static int v3_cache_packet_formats(struct snd_motu *motu)
 }
 
 static const struct snd_motu_protocol snd_motu_protocol_v3 = {
-	.get_clock_rate		= v3_get_clock_rate,
-	.set_clock_rate		= v3_set_clock_rate,
-	.get_clock_source	= v3_get_clock_source,
-	.switch_fetching_mode	= v3_switch_fetching_mode,
-	.cache_packet_formats	= v3_cache_packet_formats,
 };
 
 const struct snd_motu_spec snd_motu_spec_828mk3 = {
diff --git a/sound/firewire/motu/motu-stream.c b/sound/firewire/motu/motu-stream.c
index 11a2b8b37768..87a8d9016f83 100644
--- a/sound/firewire/motu/motu-stream.c
+++ b/sound/firewire/motu/motu-stream.c
@@ -88,7 +88,7 @@ static void finish_session(struct snd_motu *motu)
 	u32 data;
 	int err;
 
-	err = motu->spec->protocol->switch_fetching_mode(motu, false);
+	err = snd_motu_protocol_switch_fetching_mode(motu, false);
 	if (err < 0)
 		return;
 
@@ -110,7 +110,7 @@ int snd_motu_stream_cache_packet_formats(struct snd_motu *motu)
 {
 	int err;
 
-	err = motu->spec->protocol->cache_packet_formats(motu);
+	err = snd_motu_protocol_cache_packet_formats(motu);
 	if (err < 0)
 		return err;
 
@@ -140,7 +140,7 @@ int snd_motu_stream_reserve_duplex(struct snd_motu *motu, unsigned int rate,
 	unsigned int curr_rate;
 	int err;
 
-	err = motu->spec->protocol->get_clock_rate(motu, &curr_rate);
+	err = snd_motu_protocol_get_clock_rate(motu, &curr_rate);
 	if (err < 0)
 		return err;
 	if (rate == 0)
@@ -153,7 +153,7 @@ int snd_motu_stream_reserve_duplex(struct snd_motu *motu, unsigned int rate,
 		fw_iso_resources_free(&motu->tx_resources);
 		fw_iso_resources_free(&motu->rx_resources);
 
-		err = motu->spec->protocol->set_clock_rate(motu, rate);
+		err = snd_motu_protocol_set_clock_rate(motu, rate);
 		if (err < 0) {
 			dev_err(&motu->unit->device,
 				"fail to set sampling rate: %d\n", err);
@@ -272,7 +272,7 @@ int snd_motu_stream_start_duplex(struct snd_motu *motu)
 			goto stop_streams;
 		}
 
-		err = motu->spec->protocol->switch_fetching_mode(motu, true);
+		err = snd_motu_protocol_switch_fetching_mode(motu, true);
 		if (err < 0) {
 			dev_err(&motu->unit->device,
 				"fail to enable frame fetching: %d\n", err);
diff --git a/sound/firewire/motu/motu.h b/sound/firewire/motu/motu.h
index 9db692006d95..d59841677596 100644
--- a/sound/firewire/motu/motu.h
+++ b/sound/firewire/motu/motu.h
@@ -179,4 +179,79 @@ int snd_motu_create_pcm_devices(struct snd_motu *motu);
 int snd_motu_create_midi_devices(struct snd_motu *motu);
 
 int snd_motu_create_hwdep_device(struct snd_motu *motu);
+
+int snd_motu_protocol_v2_get_clock_rate(struct snd_motu *motu,
+					unsigned int *rate);
+int snd_motu_protocol_v2_set_clock_rate(struct snd_motu *motu,
+					unsigned int rate);
+int snd_motu_protocol_v2_get_clock_source(struct snd_motu *motu,
+					  enum snd_motu_clock_source *src);
+int snd_motu_protocol_v2_switch_fetching_mode(struct snd_motu *motu,
+					      bool enable);
+int snd_motu_protocol_v2_cache_packet_formats(struct snd_motu *motu);
+
+int snd_motu_protocol_v3_get_clock_rate(struct snd_motu *motu,
+					unsigned int *rate);
+int snd_motu_protocol_v3_set_clock_rate(struct snd_motu *motu,
+					unsigned int rate);
+int snd_motu_protocol_v3_get_clock_source(struct snd_motu *motu,
+					  enum snd_motu_clock_source *src);
+int snd_motu_protocol_v3_switch_fetching_mode(struct snd_motu *motu,
+					      bool enable);
+int snd_motu_protocol_v3_cache_packet_formats(struct snd_motu *motu);
+
+static inline int snd_motu_protocol_get_clock_rate(struct snd_motu *motu,
+						   unsigned int *rate)
+{
+	if (motu->spec->protocol_version == SND_MOTU_PROTOCOL_V2)
+		return snd_motu_protocol_v2_get_clock_rate(motu, rate);
+	else if (motu->spec->protocol_version == SND_MOTU_PROTOCOL_V3)
+		return snd_motu_protocol_v3_get_clock_rate(motu, rate);
+	else
+		return -ENXIO;
+}
+
+static inline int snd_motu_protocol_set_clock_rate(struct snd_motu *motu,
+						   unsigned int rate)
+{
+	if (motu->spec->protocol_version == SND_MOTU_PROTOCOL_V2)
+		return snd_motu_protocol_v2_set_clock_rate(motu, rate);
+	else if (motu->spec->protocol_version == SND_MOTU_PROTOCOL_V3)
+		return snd_motu_protocol_v3_set_clock_rate(motu, rate);
+	else
+		return -ENXIO;
+}
+
+static inline int snd_motu_protocol_get_clock_source(struct snd_motu *motu,
+					enum snd_motu_clock_source *source)
+{
+	if (motu->spec->protocol_version == SND_MOTU_PROTOCOL_V2)
+		return snd_motu_protocol_v2_get_clock_source(motu, source);
+	else if (motu->spec->protocol_version == SND_MOTU_PROTOCOL_V3)
+		return snd_motu_protocol_v3_get_clock_source(motu, source);
+	else
+		return -ENXIO;
+}
+
+static inline int snd_motu_protocol_switch_fetching_mode(struct snd_motu *motu,
+							 bool enable)
+{
+	if (motu->spec->protocol_version == SND_MOTU_PROTOCOL_V2)
+		return snd_motu_protocol_v2_switch_fetching_mode(motu, enable);
+	else if (motu->spec->protocol_version == SND_MOTU_PROTOCOL_V3)
+		return snd_motu_protocol_v3_switch_fetching_mode(motu, enable);
+	else
+		return -ENXIO;
+}
+
+static inline int snd_motu_protocol_cache_packet_formats(struct snd_motu *motu)
+{
+	if (motu->spec->protocol_version == SND_MOTU_PROTOCOL_V2)
+		return snd_motu_protocol_v2_cache_packet_formats(motu);
+	else if (motu->spec->protocol_version == SND_MOTU_PROTOCOL_V3)
+		return snd_motu_protocol_v3_cache_packet_formats(motu);
+	else
+		return -ENXIO;
+}
+
 #endif