ALSA: fireface: localize a handler for MIDI messages on tx transaction

Content of asynchronous transaction for MIDI messages differs between
Fireface 400 and 800.

This commit adds a model-specific handler for the transaction and adds
arrangement.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/fireface/ff-protocol-ff400.c

@@ -105,7 +105,45 @@ static int ff400_switch_fetching_mode(struct snd_ff *ff, bool enable)
 	return err;
 }
 
+static void ff400_handle_midi_msg(struct snd_ff *ff, __le32 *buf, size_t length)
+{
+	int i;
+
+	for (i = 0; i < length / 4; i++) {
+		u32 quad = le32_to_cpu(buf[i]);
+		u8 byte;
+		unsigned int index;
+		struct snd_rawmidi_substream *substream;
+
+		/* Message in first port. */
+		/*
+		 * This value may represent the index of this unit when the same
+		 * units are on the same IEEE 1394 bus. This driver doesn't use
+		 * it.
+		 */
+		index = (quad >> 8) & 0xff;
+		if (index > 0) {
+			substream = READ_ONCE(ff->tx_midi_substreams[0]);
+			if (substream != NULL) {
+				byte = quad & 0xff;
+				snd_rawmidi_receive(substream, &byte, 1);
+			}
+		}
+
+		/* Message in second port. */
+		index = (quad >> 24) & 0xff;
+		if (index > 0) {
+			substream = READ_ONCE(ff->tx_midi_substreams[1]);
+			if (substream != NULL) {
+				byte = (quad >> 16) & 0xff;
+				snd_rawmidi_receive(substream, &byte, 1);
+			}
+		}
+	}
+}
+
 const struct snd_ff_protocol snd_ff_protocol_ff400 = {
+	.handle_midi_msg	= ff400_handle_midi_msg,
 	.begin_session		= ff400_begin_session,
 	.finish_session		= ff400_finish_session,
 	.switch_fetching_mode	= ff400_switch_fetching_mode,

sound/firewire/fireface/ff-transaction.c

@@ -206,42 +206,10 @@ static void handle_midi_msg(struct fw_card *card, struct fw_request *request,
 {
 	struct snd_ff *ff = callback_data;
 	__le32 *buf = data;
-	u32 quad;
-	u8 byte;
-	unsigned int index;
-	struct snd_rawmidi_substream *substream;
-	int i;
 
 	fw_send_response(card, request, RCODE_COMPLETE);
 
-	for (i = 0; i < length / 4; i++) {
-		quad = le32_to_cpu(buf[i]);
-
-		/* Message in first port. */
-		/*
-		 * This value may represent the index of this unit when the same
-		 * units are on the same IEEE 1394 bus. This driver doesn't use
-		 * it.
-		 */
-		index = (quad >> 8) & 0xff;
-		if (index > 0) {
-			substream = READ_ONCE(ff->tx_midi_substreams[0]);
-			if (substream != NULL) {
-				byte = quad & 0xff;
-				snd_rawmidi_receive(substream, &byte, 1);
-			}
-		}
-
-		/* Message in second port. */
-		index = (quad >> 24) & 0xff;
-		if (index > 0) {
-			substream = READ_ONCE(ff->tx_midi_substreams[1]);
-			if (substream != NULL) {
-				byte = (quad >> 16) & 0xff;
-				snd_rawmidi_receive(substream, &byte, 1);
-			}
-		}
-	}
+	ff->spec->protocol->handle_midi_msg(ff, buf, length);
 }
 
 static int allocate_own_address(struct snd_ff *ff, int i)

sound/firewire/fireface/ff.h

@@ -108,6 +108,7 @@ enum snd_ff_clock_src {
 };
 
 struct snd_ff_protocol {
+	void (*handle_midi_msg)(struct snd_ff *ff, __le32 *buf, size_t length);
 	int (*begin_session)(struct snd_ff *ff, unsigned int rate);
 	void (*finish_session)(struct snd_ff *ff);
 	int (*switch_fetching_mode)(struct snd_ff *ff, bool enable);