ALSA: firewire-tascam: add support for outgoing MIDI messages by asynchronous transaction

TASCAM FireWire series use asynchronous transaction to receive MIDI
messages. The transaction should be sent to a certain address.

This commit supports the outgoing MIDI messages. The messages in the
transaction includes some quirks:
 * One MIDI message is transferred in one quadlet transaction, except for
   system exclusives.
 * MIDI running status is not allowed, thus transactions always include
   status byte.
 * The basic data format is the same as transferring MIDI messages
   supported in previous commit.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/firewire/tascam/tascam-transaction.c b/sound/firewire/tascam/tascam-transaction.c
index 853438d..6b74fb5 100644 (file)
--- a/sound/firewire/tascam/tascam-transaction.c
+++ b/sound/firewire/tascam/tascam-transaction.c
@@ -58,6 +58,83 @@ static inline int calculate_message_bytes(u8 status)
        return -EINVAL;
 }
 
+static int fill_message(struct snd_rawmidi_substream *substream, u8 *buf)
+{
+       struct snd_tscm *tscm = substream->rmidi->private_data;
+       unsigned int port = substream->number;
+       unsigned int len;
+       unsigned int i;
+       u8 status;
+       int consume;
+
+       buf[0] = buf[1] = buf[2] = buf[3] = 0x00;
+
+       len = snd_rawmidi_transmit_peek(substream, buf + 1, 3);
+       if (len == 0)
+               return 0;
+
+       /* On exclusive message. */
+       if (tscm->on_sysex[port]) {
+               /* Seek the end of exclusives. */
+               for (i = 1; i < 4 || i < len; ++i) {
+                       if (buf[i] == 0xf7) {
+                               tscm->on_sysex[port] = false;
+                               break;
+                       }
+               }
+
+               /* At the end of exclusive message, use label 0x07. */
+               if (!tscm->on_sysex[port]) {
+                       len = i;
+                       buf[0] = (port << 4) | 0x07;
+               /* During exclusive message, use label 0x04. */
+               } else if (len == 3) {
+                       buf[0] = (port << 4) | 0x04;
+               /* We need to fill whole 3 bytes. Go to next change. */
+               } else {
+                       len = 0;
+               }
+       } else {
+               /* The beginning of exclusives. */
+               if (buf[1] == 0xf0) {
+                       /* Transfer it in next chance in another condition. */
+                       tscm->on_sysex[port] = true;
+                       return 0;
+               } else {
+                       /* On running-status. */
+                       if ((buf[1] & 0x80) != 0x80)
+                               status = tscm->running_status[port];
+                       else
+                               status = buf[1];
+
+                       /* Calculate consume bytes. */
+                       consume = calculate_message_bytes(status);
+                       if (consume <= 0)
+                               return 0;
+
+                       /* On running-status. */
+                       if ((buf[1] & 0x80) != 0x80) {
+                               buf[3] = buf[2];
+                               buf[2] = buf[1];
+                               buf[1] = tscm->running_status[port];
+                               consume--;
+                       } else {
+                               tscm->running_status[port] = buf[1];
+                       }
+
+                       /* Confirm length. */
+                       if (len < consume)
+                               return 0;
+                       if (len > consume)
+                               len = consume;
+               }
+
+               buf[0] = (port << 4) | (buf[1] >> 4);
+       }
+
+       return len;
+}
+
 static void handle_midi_tx(struct fw_card *card, struct fw_request *request,
                           int tcode, int destination, int source,
                           int generation, unsigned long long offset,
@@ -111,6 +188,7 @@ int snd_tscm_transaction_register(struct snd_tscm *tscm)
                .start  = 0xffffe0000000ull,
                .end    = 0xffffe000ffffull,
        };
+       unsigned int i;
        int err;
 
        /*
@@ -129,9 +207,21 @@ int snd_tscm_transaction_register(struct snd_tscm *tscm)
 
        err = snd_tscm_transaction_reregister(tscm);
        if (err < 0)
-               fw_core_remove_address_handler(&tscm->async_handler);
+               goto error;
+
+       for (i = 0; i < TSCM_MIDI_OUT_PORT_MAX; i++) {
+               err = snd_fw_async_midi_port_init(
+                               &tscm->out_ports[i], tscm->unit,
+                               TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_RX_QUAD,
+                               4, fill_message);
+               if (err < 0)
+                       goto error;
+       }
 
        return err;
+error:
+       fw_core_remove_address_handler(&tscm->async_handler);
+       return err;
 }
 
 /* At bus reset, these registers are cleared. */
@@ -167,6 +257,7 @@ int snd_tscm_transaction_reregister(struct snd_tscm *tscm)
 void snd_tscm_transaction_unregister(struct snd_tscm *tscm)
 {
        __be32 reg;
+       unsigned int i;
 
        /* Turn off messaging. */
        reg = cpu_to_be32(0x00000000);
@@ -183,4 +274,6 @@ void snd_tscm_transaction_unregister(struct snd_tscm *tscm)
                           &reg, sizeof(reg), 0);
 
        fw_core_remove_address_handler(&tscm->async_handler);
+       for (i = 0; i < TSCM_MIDI_OUT_PORT_MAX; i++)
+               snd_fw_async_midi_port_destroy(&tscm->out_ports[i]);
 }

diff --git a/sound/firewire/tascam/tascam.h b/sound/firewire/tascam/tascam.h
index b0e602b..c2f0c74 100644 (file)
--- a/sound/firewire/tascam/tascam.h
+++ b/sound/firewire/tascam/tascam.h
@@ -67,6 +67,14 @@ struct snd_tscm {
        /* For MIDI message incoming transactions. */
        struct fw_address_handler async_handler;
        struct snd_rawmidi_substream *tx_midi_substreams[TSCM_MIDI_IN_PORT_MAX];
+
+       /* For MIDI message outgoing transactions. */
+       struct snd_fw_async_midi_port out_ports[TSCM_MIDI_OUT_PORT_MAX];
+       u8 running_status[TSCM_MIDI_OUT_PORT_MAX];
+       bool on_sysex[TSCM_MIDI_OUT_PORT_MAX];
+
+       /* For control messages. */
+       struct snd_firewire_tascam_status *status;
 };
 
 #define TSCM_ADDR_BASE                 0xffff00000000ull