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/*
* tascam-transaction.c - a part of driver for TASCAM FireWire series
*
* Copyright (c) 2015 Takashi Sakamoto
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
#include "tascam.h"
/*
* When return minus value, given argument is not MIDI status.
* When return 0, given argument is a beginning of system exclusive.
* When return the others, given argument is MIDI data.
*/
static inline int calculate_message_bytes(u8 status)
{
switch (status) {
case 0xf6: /* Tune request. */
case 0xf8: /* Timing clock. */
case 0xfa: /* Start. */
case 0xfb: /* Continue. */
case 0xfc: /* Stop. */
case 0xfe: /* Active sensing. */
case 0xff: /* System reset. */
return 1;
case 0xf1: /* MIDI time code quarter frame. */
case 0xf3: /* Song select. */
return 2;
case 0xf2: /* Song position pointer. */
return 3;
case 0xf0: /* Exclusive. */
return 0;
case 0xf7: /* End of exclusive. */
break;
case 0xf4: /* Undefined. */
case 0xf5: /* Undefined. */
case 0xf9: /* Undefined. */
case 0xfd: /* Undefined. */
break;
default:
switch (status & 0xf0) {
case 0x80: /* Note on. */
case 0x90: /* Note off. */
case 0xa0: /* Polyphonic key pressure. */
case 0xb0: /* Control change and Mode change. */
case 0xe0: /* Pitch bend change. */
return 3;
case 0xc0: /* Program change. */
case 0xd0: /* Channel pressure. */
return 2;
default:
break;
}
break;
}
return -EINVAL;
}
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,
void *data, size_t length, void *callback_data)
{
struct snd_tscm *tscm = callback_data;
u32 *buf = (u32 *)data;
unsigned int messages;
unsigned int i;
unsigned int port;
struct snd_rawmidi_substream *substream;
u8 *b;
int bytes;
if (offset != tscm->async_handler.offset)
goto end;
messages = length / 8;
for (i = 0; i < messages; i++) {
b = (u8 *)(buf + i * 2);
port = b[0] >> 4;
/* TODO: support virtual MIDI ports. */
if (port > tscm->spec->midi_capture_ports)
goto end;
/* Assume the message length. */
bytes = calculate_message_bytes(b[1]);
/* On MIDI data or exclusives. */
if (bytes <= 0) {
/* Seek the end of exclusives. */
for (bytes = 1; bytes < 4; bytes++) {
if (b[bytes] == 0xf7)
break;
}
if (bytes == 4)
bytes = 3;
}
substream = ACCESS_ONCE(tscm->tx_midi_substreams[port]);
if (substream != NULL)
snd_rawmidi_receive(substream, b + 1, bytes);
}
end:
fw_send_response(card, request, RCODE_COMPLETE);
}
int snd_tscm_transaction_register(struct snd_tscm *tscm)
{
static const struct fw_address_region resp_register_region = {
.start = 0xffffe0000000ull,
.end = 0xffffe000ffffull,
};
int err;
/*
* Usually, two quadlets are transferred by one transaction. The first
* quadlet has MIDI messages, the rest includes timestamp.
* Sometimes, 8 set of the data is transferred by a block transaction.
*/
tscm->async_handler.length = 8 * 8;
tscm->async_handler.address_callback = handle_midi_tx;
tscm->async_handler.callback_data = tscm;
err = fw_core_add_address_handler(&tscm->async_handler,
&resp_register_region);
if (err < 0)
return err;
err = snd_tscm_transaction_reregister(tscm);
if (err < 0)
fw_core_remove_address_handler(&tscm->async_handler);
return err;
}
/* At bus reset, these registers are cleared. */
int snd_tscm_transaction_reregister(struct snd_tscm *tscm)
{
struct fw_device *device = fw_parent_device(tscm->unit);
__be32 reg;
int err;
/* Register messaging address. Block transaction is not allowed. */
reg = cpu_to_be32((device->card->node_id << 16) |
(tscm->async_handler.offset >> 32));
err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_TX_ADDR_HI,
®, sizeof(reg), 0);
if (err < 0)
return err;
reg = cpu_to_be32(tscm->async_handler.offset);
err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_TX_ADDR_LO,
®, sizeof(reg), 0);
if (err < 0)
return err;
/* Turn on messaging. */
reg = cpu_to_be32(0x00000001);
return snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_TX_ON,
®, sizeof(reg), 0);
}
void snd_tscm_transaction_unregister(struct snd_tscm *tscm)
{
__be32 reg;
/* Turn off messaging. */
reg = cpu_to_be32(0x00000000);
snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_TX_ON,
®, sizeof(reg), 0);
/* Unregister the address. */
snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_TX_ADDR_HI,
®, sizeof(reg), 0);
snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_TX_ADDR_LO,
®, sizeof(reg), 0);
fw_core_remove_address_handler(&tscm->async_handler);
}
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