ALSA: firewire-motu: add a flag for chunks for main 1/2 out

This driver explicitly assumes that all of supported models have main data
chunk separated from chunk for analog ports. However, MOTU Traveler doesn't
support the separated main data chunk.

This commit adds a flag for the separated main data chunk.
Signed-off-by: NTakashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/firewire/motu/motu-protocol-v2.c

@@ -149,11 +149,15 @@ static void calculate_fixed_part(struct snd_motu_packet_format *formats,
 			pcm_chunks[1] += 2;
 		}
 	} else {
-		/*
-		 * Packets to v2 units transfer main-out-1/2 and phone-out-1/2.
-		 */
-		pcm_chunks[0] += 4;
-		pcm_chunks[1] += 4;
+		if (flags & SND_MOTU_SPEC_RX_SEPARETED_MAIN) {
+			pcm_chunks[0] += 2;
+			pcm_chunks[1] += 2;
+		}
+
+		// Packets to v2 units include 2 chunks for phone 1/2, except
+		// for 176.4/192.0 kHz.
+		pcm_chunks[0] += 2;
+		pcm_chunks[1] += 2;
 	}
 
 	/*

sound/firewire/motu/motu-protocol-v3.c

@@ -188,11 +188,15 @@ static void calculate_fixed_part(struct snd_motu_packet_format *formats,
 			pcm_chunks[1] += 2;
 		}
 	} else {
-		/*
-		 * Packets to v2 units transfer main-out-1/2 and phone-out-1/2.
-		 */
-		pcm_chunks[0] += 4;
-		pcm_chunks[1] += 4;
+		if (flags & SND_MOTU_SPEC_RX_SEPARETED_MAIN) {
+			pcm_chunks[0] += 2;
+			pcm_chunks[1] += 2;
+		}
+
+		// Packets to v3 units include 2 chunks for phone 1/2, except
+		// for 176.4/192.0 kHz.
+		pcm_chunks[0] += 2;
+		pcm_chunks[1] += 2;
 	}
 
 	/*

sound/firewire/motu/motu.c

@@ -200,6 +200,7 @@ static const struct snd_motu_spec motu_828mk2 = {
 	.flags = SND_MOTU_SPEC_SUPPORT_CLOCK_X2 |
 		 SND_MOTU_SPEC_TX_MICINST_CHUNK |
 		 SND_MOTU_SPEC_TX_RETURN_CHUNK |
+		 SND_MOTU_SPEC_RX_SEPARETED_MAIN |
 		 SND_MOTU_SPEC_HAS_OPT_IFACE_A |
 		 SND_MOTU_SPEC_RX_MIDI_2ND_Q |
 		 SND_MOTU_SPEC_TX_MIDI_2ND_Q,
@@ -216,6 +217,7 @@ static const struct snd_motu_spec motu_828mk3 = {
 		 SND_MOTU_SPEC_TX_MICINST_CHUNK |
 		 SND_MOTU_SPEC_TX_RETURN_CHUNK |
 		 SND_MOTU_SPEC_TX_REVERB_CHUNK |
+		 SND_MOTU_SPEC_RX_SEPARETED_MAIN |
 		 SND_MOTU_SPEC_HAS_OPT_IFACE_A |
 		 SND_MOTU_SPEC_HAS_OPT_IFACE_B |
 		 SND_MOTU_SPEC_RX_MIDI_3RD_Q |
@@ -231,6 +233,7 @@ static const struct snd_motu_spec motu_audio_express = {
 	.flags = SND_MOTU_SPEC_SUPPORT_CLOCK_X2 |
 		 SND_MOTU_SPEC_TX_MICINST_CHUNK |
 		 SND_MOTU_SPEC_TX_RETURN_CHUNK |
+		 SND_MOTU_SPEC_RX_SEPARETED_MAIN |
 		 SND_MOTU_SPEC_RX_MIDI_2ND_Q |
 		 SND_MOTU_SPEC_TX_MIDI_3RD_Q,
 	.analog_in_ports = 2,

sound/firewire/motu/motu.h

@@ -86,6 +86,7 @@ enum snd_motu_spec_flags {
 	SND_MOTU_SPEC_RX_MIDI_3RD_Q	= 0x0200,
 	SND_MOTU_SPEC_TX_MIDI_2ND_Q	= 0x0400,
 	SND_MOTU_SPEC_TX_MIDI_3RD_Q	= 0x0800,
+	SND_MOTU_SPEC_RX_SEPARETED_MAIN	= 0x1000,
 };
 
 #define SND_MOTU_CLOCK_RATE_COUNT	6