[PATCH 0/1] ALSA: usb: Add support for Reloop Jockey 3 DJ controllers

Hi Takashi, Hello ALSA community,

After being away from active ALSA development for some 25 years or so, I am 
happy to submit this patch to introduce a dedicated driver supporting the 
Jockey 3 series of DJ Controllers made by Reloop (specifically covering the 
Master Edition and the Remix variants).

I initially evaluated the feasibility of integrating the required logic to 
handle the non-standard proprietary Ploytec framing protocol into the standard 
USB-audio driver via quirks. However, doing so would require introducing 
numerous hardware-specific exceptions throughout the core layout, adding 
significant complexity. A clean, isolated driver subdirectory provides much 
better long-term maintainability without cluttering the existing class-compliant 
architecture.

I have successfully validated and stress-tested this driver across three 
distinct hardware architectures to ensure robustness regarding DMA, timing, 
and memory alignment:
 - x86_64 (Standard PC desktop environment)
 - armhf (32-bit legacy environment on a Raspberry Pi 1B)
 - arm64 (64-bit modern SoC environment on a Raspberry Pi 4)

I look forward to your review and feedback, and I am more than happy to 
make architectural adjustments as required.

Best regards,
Frank van de Pol


Frank van de Pol (1):
  ALSA: usb: Add support for Reloop Jockey 3 DJ controllers

 MAINTAINERS                       |   7 +
 sound/usb/Kconfig                 |   1 +
 sound/usb/Makefile                |   1 +
 sound/usb/jockey3/Kconfig         |  19 +
 sound/usb/jockey3/Makefile        |   3 +
 sound/usb/jockey3/jockey3.c       | 841 ++++++++++++++++++++++++++++++
 sound/usb/jockey3/ploytec_codec.c | 116 +++++
 sound/usb/jockey3/ploytec_codec.h |  34 ++
 8 files changed, 1022 insertions(+)
 create mode 100644 sound/usb/jockey3/Kconfig
 create mode 100644 sound/usb/jockey3/Makefile
 create mode 100644 sound/usb/jockey3/jockey3.c
 create mode 100644 sound/usb/jockey3/ploytec_codec.c
 create mode 100644 sound/usb/jockey3/ploytec_codec.h

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2.47.3