diff options
Diffstat (limited to 'sound/firewire/tascam/tascam-transaction.c')
| -rw-r--r-- | sound/firewire/tascam/tascam-transaction.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/sound/firewire/tascam/tascam-transaction.c b/sound/firewire/tascam/tascam-transaction.c new file mode 100644 index 000000000000..853438d93950 --- /dev/null +++ b/sound/firewire/tascam/tascam-transaction.c @@ -0,0 +1,186 @@ +/* + * 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); +} |