On Sun, 17 Mar 2019 08:50:24 +0100, Takashi Sakamoto wrote:
This commit adds support for MOTU 8pre FireWire, which was shipped 2007 and nowadays already discontinued. Userspace applications can transmit and receive PCM frames and MIDI messages for this model via ALSA PCM interface and RawMidi/Sequencer interfaces.
Like the other models of MOTU FireWire series, this model has many quirks in its CIP.
At first, data channels for two pairs of optical interfaces. At lower sampling transmission frequency, i.e. 44.1 and 48.0 kHz, one pair is available for ADAT data, thus 8 data chunks are transferred by CIP. At middle sampling transmission frequency, i.e. 88.2 and 96.0 kHz, two pairs are available to keep 8 chunks for ADAT data, thus CIP still includes 8 data chunks.
Apart from data chunks for optical interface, CIP includes fixed number of data chunks. In tx stream, two chunks for status message, eight chunks for samples from analog 1-8 input, two chunks for mix-return. In rx stream, two chunks for control message, two chunks for main 1-2 output, two chunks for phone 1-2 output, two chunks for dummy 1-2.
CIP header in tx stream includes quirks for its dbs and dbc fields. The value of dbs field is fixed to 0x13, against its actual size. The value of dbc field is firstly updated to 0x07 from zero, then it's incremented continuously according to actual number of data h blocks.
Finally, the model has own bits to disable frame fetch.
This commit uses several options to absorb the above quirks.
$ python2 crpp < /sys/bus/firewire/devices/fw1/config_rom ROM header and bus information block ----------------------------------------------------------------- 400 0410b57d bus_info_length 4, crc_length 16, crc 46461 404 31333934 bus_name "1394" 408 20001000 irmc 0, cmc 0, isc 1, bmc 0, cyc_clk_acc 0, max_rec 1 (4) 40c 0001f200 company_id 0001f2 | 410 00083dfb device_id 0000083dfb | EUI-64 0001f20000083dfb
root directory -----------------------------------------------------------------414 0004c65c directory_length 4, crc 50780 418 030001f2 vendor 41c 0c0083c0 node capabilities per IEEE 1394 420 8d000006 --> eui-64 leaf at 438 424 d1000001 --> unit directory at 428
unit directory at 428 -----------------------------------------------------------------428 0003991c directory_length 3, crc 39196 42c 120001f2 specifier id 430 1300000f version 434 17103800 model
eui-64 leaf at 438 -----------------------------------------------------------------438 00022681 leaf_length 2, crc 9857 43c 0001f200 company_id 0001f2 | 440 00083dfb device_id 0000083dfb | EUI-64 0001f20000083dfb
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp
Applied to for-next branch now. Thanks.
Takashi