diff options
Diffstat (limited to 'sound/firewire/tascam/tascam-transaction.c')
| -rw-r--r-- | sound/firewire/tascam/tascam-transaction.c | 399 |
1 files changed, 399 insertions, 0 deletions
diff --git a/sound/firewire/tascam/tascam-transaction.c b/sound/firewire/tascam/tascam-transaction.c new file mode 100644 index 000000000..a073cece4 --- /dev/null +++ b/sound/firewire/tascam/tascam-transaction.c @@ -0,0 +1,399 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * tascam-transaction.c - a part of driver for TASCAM FireWire series + * + * Copyright (c) 2015 Takashi Sakamoto + */ + +#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 int fill_message(struct snd_fw_async_midi_port *port, + struct snd_rawmidi_substream *substream) +{ + int i, len, consume; + u8 *label, *msg; + u8 status; + + /* The first byte is used for label, the rest for MIDI bytes. */ + label = port->buf; + msg = port->buf + 1; + + consume = snd_rawmidi_transmit_peek(substream, msg, 3); + if (consume == 0) + return 0; + + /* On exclusive message. */ + if (port->on_sysex) { + /* Seek the end of exclusives. */ + for (i = 0; i < consume; ++i) { + if (msg[i] == 0xf7) { + port->on_sysex = false; + break; + } + } + + /* At the end of exclusive message, use label 0x07. */ + if (!port->on_sysex) { + consume = i + 1; + *label = (substream->number << 4) | 0x07; + /* During exclusive message, use label 0x04. */ + } else if (consume == 3) { + *label = (substream->number << 4) | 0x04; + /* We need to fill whole 3 bytes. Go to next change. */ + } else { + return 0; + } + + len = consume; + } else { + /* The beginning of exclusives. */ + if (msg[0] == 0xf0) { + /* Transfer it in next chance in another condition. */ + port->on_sysex = true; + return 0; + } else { + /* On running-status. */ + if ((msg[0] & 0x80) != 0x80) + status = port->running_status; + else + status = msg[0]; + + /* Calculate consume bytes. */ + len = calculate_message_bytes(status); + if (len <= 0) + return 0; + + /* On running-status. */ + if ((msg[0] & 0x80) != 0x80) { + /* Enough MIDI bytes were not retrieved. */ + if (consume < len - 1) + return 0; + consume = len - 1; + + msg[2] = msg[1]; + msg[1] = msg[0]; + msg[0] = port->running_status; + } else { + /* Enough MIDI bytes were not retrieved. */ + if (consume < len) + return 0; + consume = len; + + port->running_status = msg[0]; + } + } + + *label = (substream->number << 4) | (msg[0] >> 4); + } + + if (len > 0 && len < 3) + memset(msg + len, 0, 3 - len); + + return consume; +} + +static void async_midi_port_callback(struct fw_card *card, int rcode, + void *data, size_t length, + void *callback_data) +{ + struct snd_fw_async_midi_port *port = callback_data; + struct snd_rawmidi_substream *substream = READ_ONCE(port->substream); + + /* This port is closed. */ + if (substream == NULL) + return; + + if (rcode == RCODE_COMPLETE) + snd_rawmidi_transmit_ack(substream, port->consume_bytes); + else if (!rcode_is_permanent_error(rcode)) + /* To start next transaction immediately for recovery. */ + port->next_ktime = 0; + else + /* Don't continue processing. */ + port->error = true; + + port->idling = true; + + if (!snd_rawmidi_transmit_empty(substream)) + schedule_work(&port->work); +} + +static void midi_port_work(struct work_struct *work) +{ + struct snd_fw_async_midi_port *port = + container_of(work, struct snd_fw_async_midi_port, work); + struct snd_rawmidi_substream *substream = READ_ONCE(port->substream); + int generation; + + /* Under transacting or error state. */ + if (!port->idling || port->error) + return; + + /* Nothing to do. */ + if (substream == NULL || snd_rawmidi_transmit_empty(substream)) + return; + + /* Do it in next chance. */ + if (ktime_after(port->next_ktime, ktime_get())) { + schedule_work(&port->work); + return; + } + + /* + * Fill the buffer. The callee must use snd_rawmidi_transmit_peek(). + * Later, snd_rawmidi_transmit_ack() is called. + */ + memset(port->buf, 0, 4); + port->consume_bytes = fill_message(port, substream); + if (port->consume_bytes <= 0) { + /* Do it in next chance, immediately. */ + if (port->consume_bytes == 0) { + port->next_ktime = 0; + schedule_work(&port->work); + } else { + /* Fatal error. */ + port->error = true; + } + return; + } + + /* Set interval to next transaction. */ + port->next_ktime = ktime_add_ns(ktime_get(), + port->consume_bytes * 8 * (NSEC_PER_SEC / 31250)); + + /* Start this transaction. */ + port->idling = false; + + /* + * In Linux FireWire core, when generation is updated with memory + * barrier, node id has already been updated. In this module, After + * this smp_rmb(), load/store instructions to memory are completed. + * Thus, both of generation and node id are available with recent + * values. This is a light-serialization solution to handle bus reset + * events on IEEE 1394 bus. + */ + generation = port->parent->generation; + smp_rmb(); + + fw_send_request(port->parent->card, &port->transaction, + TCODE_WRITE_QUADLET_REQUEST, + port->parent->node_id, generation, + port->parent->max_speed, + TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_RX_QUAD, + port->buf, 4, async_midi_port_callback, + port); +} + +void snd_fw_async_midi_port_init(struct snd_fw_async_midi_port *port) +{ + port->idling = true; + port->error = false; + port->running_status = 0; + port->on_sysex = false; +} + +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 = READ_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, + }; + unsigned int i; + 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) + goto error; + + for (i = 0; i < TSCM_MIDI_OUT_PORT_MAX; i++) { + tscm->out_ports[i].parent = fw_parent_device(tscm->unit); + tscm->out_ports[i].next_ktime = 0; + INIT_WORK(&tscm->out_ports[i].work, midi_port_work); + } + + return err; +error: + fw_core_remove_address_handler(&tscm->async_handler); + tscm->async_handler.callback_data = NULL; + 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); + err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, + TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_TX_ON, + ®, sizeof(reg), 0); + if (err < 0) + return err; + + /* Turn on FireWire LED. */ + reg = cpu_to_be32(0x0001008e); + return snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, + TSCM_ADDR_BASE + TSCM_OFFSET_LED_POWER, + ®, sizeof(reg), 0); +} + +void snd_tscm_transaction_unregister(struct snd_tscm *tscm) +{ + __be32 reg; + + if (tscm->async_handler.callback_data == NULL) + return; + + /* Turn off FireWire LED. */ + reg = cpu_to_be32(0x0000008e); + snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, + TSCM_ADDR_BASE + TSCM_OFFSET_LED_POWER, + ®, sizeof(reg), 0); + + /* 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); + tscm->async_handler.callback_data = NULL; +} |