[alsa-devel] [PATCH] ALSA: firewire-motu: add support for MOTU 4pre

[Takashi Iwai]

On Fri, 30 Aug 2019 03:14:56 +0200,
Takashi Sakamoto wrote:
> 
> MOTU 4pre was launched in 2012 by MOTU, Inc. This commit allows userspace
> applications can transmit and receive PCM frames and MIDI messages for
> this model via ALSA PCM interface and RawMidi/Sequencer interfaces.
> 
> The device supports MOTU protocol version 3. Unlike the other devices, the
> device is simply designed. The size of data block is fixed to 10 quadlets
> during available sampling rates (44.1 - 96.0 kHz). Each data block
> includes 1 source packet header, 2 data chunks for messages, 8 data chunks
> for PCM samples and 2 data chunks for padding to quadlet alignment. The
> device has no MIDI, optical, BNC and AES/EBU interfaces.
> 
> Like support for the other MOTU devices, the quality of playback sound
> is not enough good with periodical noise yet.
> 
> $ python2 crpp < ~/git/am-config-rom/motu/motu-4pre.img
>                ROM header and bus information block
>                -----------------------------------------------------------------
> 400  041078cc  bus_info_length 4, crc_length 16, crc 30924
> 404  31333934  bus_name "1394"
> 408  20ff7000  irmc 0, cmc 0, isc 1, bmc 0, cyc_clk_acc 255, max_rec 7 (256)
> 40c  0001f200  company_id 0001f2     |
> 410  000a41c5  device_id 00000a41c5  | EUI-64 0001f200000a41c5
> 
>                root directory
>                -----------------------------------------------------------------
> 414  0004ef04  directory_length 4, crc 61188
> 418  030001f2  vendor
> 41c  0c0083c0  node capabilities per IEEE 1394
> 420  d1000002  --> unit directory at 428
> 424  8d000005  --> eui-64 leaf at 438
> 
>                unit directory at 428
>                -----------------------------------------------------------------
> 428  0003ceda  directory_length 3, crc 52954
> 42c  120001f2  specifier id
> 430  13000045  version
> 434  17103800  model
> 
>                eui-64 leaf at 438
>                -----------------------------------------------------------------
> 438  0002d248  leaf_length 2, crc 53832
> 43c  0001f200  company_id 0001f2     |
> 440  000a41c5  device_id 00000a41c5  | EUI-64 0001f200000a41c5
> 
> Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>

Applied, thanks.


Takashi