diff options
Diffstat (limited to 'sound/firewire/oxfw')
| -rw-r--r-- | sound/firewire/oxfw/oxfw-scs1x.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/sound/firewire/oxfw/oxfw-scs1x.c b/sound/firewire/oxfw/oxfw-scs1x.c index 6ab63f23b345..84eacdb9f4c5 100644 --- a/sound/firewire/oxfw/oxfw-scs1x.c +++ b/sound/firewire/oxfw/oxfw-scs1x.c @@ -18,6 +18,20 @@ struct fw_scs1x { struct fw_address_handler hss_handler; u8 input_escape_count; struct snd_rawmidi_substream *input; + + /* For MIDI playback. */ + struct snd_rawmidi_substream *output; + bool output_idle; + u8 output_status; + u8 output_bytes; + bool output_escaped; + bool output_escape_high_nibble; + struct tasklet_struct tasklet; + wait_queue_head_t idle_wait; + u8 buffer[HSS1394_MAX_PACKET_SIZE]; + bool transaction_running; + struct fw_transaction transaction; + struct fw_device *fw_dev; }; static const u8 sysex_escape_prefix[] = { @@ -106,6 +120,148 @@ end: fw_send_response(card, request, rcode); } +static void scs_write_callback(struct fw_card *card, int rcode, + void *data, size_t length, void *callback_data) +{ + struct fw_scs1x *scs = callback_data; + + if (rcode == RCODE_GENERATION) + ; /* TODO: retry this packet */ + + scs->transaction_running = false; + tasklet_schedule(&scs->tasklet); +} + +static bool is_valid_running_status(u8 status) +{ + return status >= 0x80 && status <= 0xef; +} + +static bool is_one_byte_cmd(u8 status) +{ + return status == 0xf6 || + status >= 0xf8; +} + +static bool is_two_bytes_cmd(u8 status) +{ + return (status >= 0xc0 && status <= 0xdf) || + status == 0xf1 || + status == 0xf3; +} + +static bool is_three_bytes_cmd(u8 status) +{ + return (status >= 0x80 && status <= 0xbf) || + (status >= 0xe0 && status <= 0xef) || + status == 0xf2; +} + +static bool is_invalid_cmd(u8 status) +{ + return status == 0xf4 || + status == 0xf5 || + status == 0xf9 || + status == 0xfd; +} + +static void scs_output_tasklet(unsigned long data) +{ + struct fw_scs1x *scs = (struct fw_scs1x *)data; + struct snd_rawmidi_substream *stream; + unsigned int i; + u8 byte; + int generation; + + if (scs->transaction_running) + return; + + stream = ACCESS_ONCE(scs->output); + if (!stream) { + scs->output_idle = true; + wake_up(&scs->idle_wait); + return; + } + + i = scs->output_bytes; + for (;;) { + if (snd_rawmidi_transmit(stream, &byte, 1) != 1) { + scs->output_bytes = i; + scs->output_idle = true; + wake_up(&scs->idle_wait); + return; + } + /* + * Convert from real MIDI to what I think the device expects (no + * running status, one command per packet, unescaped SysExs). + */ + if (scs->output_escaped && byte < 0x80) { + if (scs->output_escape_high_nibble) { + if (i < HSS1394_MAX_PACKET_SIZE) { + scs->buffer[i] = byte << 4; + scs->output_escape_high_nibble = false; + } + } else { + scs->buffer[i++] |= byte & 0x0f; + scs->output_escape_high_nibble = true; + } + } else if (byte < 0x80) { + if (i == 1) { + if (!is_valid_running_status( + scs->output_status)) + continue; + scs->buffer[0] = HSS1394_TAG_USER_DATA; + scs->buffer[i++] = scs->output_status; + } + scs->buffer[i++] = byte; + if ((i == 3 && is_two_bytes_cmd(scs->output_status)) || + (i == 4 && is_three_bytes_cmd(scs->output_status))) + break; + if (i == 1 + ARRAY_SIZE(sysex_escape_prefix) && + !memcmp(scs->buffer + 1, sysex_escape_prefix, + ARRAY_SIZE(sysex_escape_prefix))) { + scs->output_escaped = true; + scs->output_escape_high_nibble = true; + i = 0; + } + if (i >= HSS1394_MAX_PACKET_SIZE) + i = 1; + } else if (byte == 0xf7) { + if (scs->output_escaped) { + if (i >= 1 && scs->output_escape_high_nibble && + scs->buffer[0] != + HSS1394_TAG_CHANGE_ADDRESS) + break; + } else { + if (i > 1 && scs->output_status == 0xf0) { + scs->buffer[i++] = 0xf7; + break; + } + } + i = 1; + scs->output_escaped = false; + } else if (!is_invalid_cmd(byte) && byte < 0xf8) { + i = 1; + scs->buffer[0] = HSS1394_TAG_USER_DATA; + scs->buffer[i++] = byte; + scs->output_status = byte; + scs->output_escaped = false; + if (is_one_byte_cmd(byte)) + break; + } + } + scs->output_bytes = 1; + scs->output_escaped = false; + + scs->transaction_running = true; + generation = scs->fw_dev->generation; + smp_rmb(); /* node_id vs. generation */ + fw_send_request(scs->fw_dev->card, &scs->transaction, + TCODE_WRITE_BLOCK_REQUEST, scs->fw_dev->node_id, + generation, scs->fw_dev->max_speed, HSS1394_ADDRESS, + scs->buffer, i, scs_write_callback, scs); +} + static int midi_capture_open(struct snd_rawmidi_substream *stream) { return 0; @@ -166,6 +322,7 @@ int snd_oxfw_scs1x_add(struct snd_oxfw *oxfw) scs = kzalloc(sizeof(struct fw_scs1x), GFP_KERNEL); if (scs == NULL) return -ENOMEM; + scs->fw_dev = fw_parent_device(oxfw->unit); oxfw->spec = scs; /* Allocate own handler for imcoming asynchronous transaction. */ @@ -195,6 +352,10 @@ int snd_oxfw_scs1x_add(struct snd_oxfw *oxfw) snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &midi_capture_ops); + tasklet_init(&scs->tasklet, scs_output_tasklet, (unsigned long)scs); + init_waitqueue_head(&scs->idle_wait); + scs->output_idle = true; + return 0; err_allocated: fw_core_remove_address_handler(&scs->hss_handler); |