diff options
Diffstat (limited to 'sound/firewire/fireface/ff-protocol-latter.c')
| -rw-r--r-- | sound/firewire/fireface/ff-protocol-latter.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/sound/firewire/fireface/ff-protocol-latter.c b/sound/firewire/fireface/ff-protocol-latter.c index 64767ba439db..a812ab6feb58 100644 --- a/sound/firewire/fireface/ff-protocol-latter.c +++ b/sound/firewire/fireface/ff-protocol-latter.c @@ -264,7 +264,50 @@ static void latter_dump_status(struct snd_ff *ff, struct snd_info_buffer *buffer snd_iprintf(buffer, "Referred clock: %s %d\n", label, rate); } +// NOTE: transactions are transferred within 0x00-0x7f in allocated range of +// address. This seems to be for check of discontinuity in receiver side. +static void latter_handle_midi_msg(struct snd_ff *ff, unsigned int offset, + __le32 *buf, size_t length) +{ + u32 data = le32_to_cpu(*buf); + unsigned int index = (data & 0x000000f0) >> 4; + u8 byte[3]; + struct snd_rawmidi_substream *substream; + unsigned int len; + + if (index > ff->spec->midi_in_ports) + return; + + switch (data & 0x0000000f) { + case 0x00000008: + case 0x00000009: + case 0x0000000a: + case 0x0000000b: + case 0x0000000e: + len = 3; + break; + case 0x0000000c: + case 0x0000000d: + len = 2; + break; + default: + len = data & 0x00000003; + if (len == 0) + len = 3; + break; + } + + byte[0] = (data & 0x0000ff00) >> 8; + byte[1] = (data & 0x00ff0000) >> 16; + byte[2] = (data & 0xff000000) >> 24; + + substream = READ_ONCE(ff->tx_midi_substreams[index]); + if (substream) + snd_rawmidi_receive(substream, byte, len); +} + const struct snd_ff_protocol snd_ff_protocol_latter = { + .handle_midi_msg = latter_handle_midi_msg, .get_clock = latter_get_clock, .switch_fetching_mode = latter_switch_fetching_mode, .begin_session = latter_begin_session, |