ALSA: firewire-motu: add alternative functions to detect packet format for protocol v2

This commit adds alternative functions to detect packet format so that
each function corresponds to each model.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20200519111641.123211-8-o-takashi@sakamocchi.jpSigned-off-by: Takashi Iwai <tiwai@suse.de>

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

@@ -164,7 +164,7 @@ int snd_motu_protocol_v2_switch_fetching_mode(struct snd_motu *motu,
 	if (enable)
 		data |= V2_CLOCK_FETCH_ENABLE;
 
-	if (motu->spec->flags & SND_MOTU_SPEC_SUPPORT_CLOCK_X4) {
+	if (motu->spec == &snd_motu_spec_traveler) {
 		// Expected for Traveler and 896HD, which implements Altera
 		// Cyclone EP1C3.
 		data |= V2_CLOCK_MODEL_SPECIFIC;
@@ -193,8 +193,6 @@ static void calculate_fixed_part(struct snd_motu_packet_format *formats,
 {
 	unsigned char pcm_chunks[3] = {0, 0, 0};
 
-	formats->msg_chunks = 2;
-
 	pcm_chunks[0] = analog_ports;
 	pcm_chunks[1] = analog_ports;
 	if (flags & SND_MOTU_SPEC_SUPPORT_CLOCK_X4)
@@ -268,12 +266,69 @@ static void calculate_differed_part(struct snd_motu_packet_format *formats,
 	formats->differed_part_pcm_chunks[1] = pcm_chunks[1];
 }
 
+static int detect_packet_formats_828mk2(struct snd_motu *motu, u32 data)
+{
+	if (((data & V2_OPT_IN_IFACE_MASK) >> V2_OPT_IN_IFACE_SHIFT) ==
+	    V2_OPT_IFACE_MODE_ADAT) {
+		motu->tx_packet_formats.pcm_chunks[0] += 8;
+		motu->tx_packet_formats.pcm_chunks[1] += 4;
+	}
+
+	if (((data & V2_OPT_OUT_IFACE_MASK) >> V2_OPT_OUT_IFACE_SHIFT) ==
+	    V2_OPT_IFACE_MODE_ADAT) {
+		motu->rx_packet_formats.pcm_chunks[0] += 8;
+		motu->rx_packet_formats.pcm_chunks[1] += 4;
+	}
+
+	return 0;
+}
+
+static int detect_packet_formats_traveler(struct snd_motu *motu, u32 data)
+{
+	if (((data & V2_OPT_IN_IFACE_MASK) >> V2_OPT_IN_IFACE_SHIFT) ==
+	    V2_OPT_IFACE_MODE_ADAT) {
+		motu->tx_packet_formats.pcm_chunks[0] += 8;
+		motu->tx_packet_formats.pcm_chunks[1] += 4;
+	}
+
+	if (((data & V2_OPT_OUT_IFACE_MASK) >> V2_OPT_OUT_IFACE_SHIFT) ==
+	    V2_OPT_IFACE_MODE_ADAT) {
+		motu->rx_packet_formats.pcm_chunks[0] += 8;
+		motu->rx_packet_formats.pcm_chunks[1] += 4;
+	}
+
+	return 0;
+}
+
+static int detect_packet_formats_8pre(struct snd_motu *motu, u32 data)
+{
+	if (((data & V2_OPT_IN_IFACE_MASK) >> V2_OPT_IN_IFACE_SHIFT) ==
+	    V2_OPT_IFACE_MODE_ADAT) {
+		motu->tx_packet_formats.pcm_chunks[0] += 8;
+		motu->tx_packet_formats.pcm_chunks[1] += 8;
+	}
+
+	if (((data & V2_OPT_OUT_IFACE_MASK) >> V2_OPT_OUT_IFACE_SHIFT) ==
+	    V2_OPT_IFACE_MODE_ADAT) {
+		motu->rx_packet_formats.pcm_chunks[0] += 8;
+		motu->rx_packet_formats.pcm_chunks[1] += 8;
+	}
+
+	return 0;
+}
+
 int snd_motu_protocol_v2_cache_packet_formats(struct snd_motu *motu)
 {
 	__be32 reg;
 	u32 data;
 	int err;
 
+	motu->tx_packet_formats.pcm_byte_offset = 10;
+	motu->rx_packet_formats.pcm_byte_offset = 10;
+
+	motu->tx_packet_formats.msg_chunks = 2;
+	motu->rx_packet_formats.msg_chunks = 2;
+
 	err = snd_motu_transaction_read(motu, V2_IN_OUT_CONF_OFFSET, &reg,
 					sizeof(reg));
 	if (err < 0)
@@ -290,10 +345,15 @@ int snd_motu_protocol_v2_cache_packet_formats(struct snd_motu *motu)
 	calculate_differed_part(&motu->rx_packet_formats, motu->spec->flags,
 			data, V2_OPT_OUT_IFACE_MASK, V2_OPT_OUT_IFACE_SHIFT);
 
-	motu->tx_packet_formats.pcm_byte_offset = 10;
-	motu->rx_packet_formats.pcm_byte_offset = 10;
 
-	return 0;
+	if (motu->spec == &snd_motu_spec_828mk2)
+		return detect_packet_formats_828mk2(motu, data);
+	else if (motu->spec == &snd_motu_spec_traveler)
+		return detect_packet_formats_traveler(motu, data);
+	else if (motu->spec == &snd_motu_spec_8pre)
+		return detect_packet_formats_8pre(motu, data);
+	else
+		return 0;
 }
 
 const struct snd_motu_spec snd_motu_spec_828mk2 = {

sound/firewire/motu/motu.h

@@ -36,6 +36,7 @@ struct snd_motu_packet_format {
 	unsigned char pcm_byte_offset;
 
 	unsigned char msg_chunks;
+	unsigned char pcm_chunks[3];
 	unsigned char fixed_part_pcm_chunks[3];
 	unsigned char differed_part_pcm_chunks[3];
 };