[0/7] usb: Add USB MIDI 2.0 Gadget Function Driver

Message

Takashi Iwai July 25, 2023, 6:21 a.m. UTC

Hi,

This is a patch set for adding a USB gadget function driver for USB
MIDI 2.0 interface.  The MIDI 2.0 support in the host side was already
enabled since 6.5 kernel in snd-usb-audio driver.  Now, this provides
a similar gadget functionality using the existing ALSA UMP helper
functions.

The gadget driver provides both MIDI 2.0 and MIDI 1.0 fallback
interfaces with one or more loopback UMP rawmidi devices.  The
configfs implementation is flexible enough to allow users to set up
multiple UMP Endpoints and Function Blocks.

The first patch adds the bare f_midi2 driver without configfs support,
followed by the configfs support, MIDI 1.0 interface support and a few
other extensions and documentation.


Takashi

===

Takashi Iwai (7):
  usb: gadget: Add support for USB MIDI 2.0 function driver
  usb: gadget: midi2: Add configfs support
  usb: gadget: midi2: Dynamically create MIDI 1.0 altset descriptors
  usb: gadget: midi2: MIDI 1.0 interface (altset 0) support
  usb: gadget: midi2: Add testing documentation
  usb: gadget: midi2: Add "Operation Mode" control
  usb: gadget: midi2: More flexible MIDI 1.0 configuration

 .../ABI/testing/configfs-usb-gadget-midi2     |   54 +
 Documentation/usb/gadget-testing.rst          |  154 +
 drivers/usb/gadget/Kconfig                    |   18 +
 drivers/usb/gadget/function/Makefile          |    2 +
 drivers/usb/gadget/function/f_midi2.c         | 2883 +++++++++++++++++
 drivers/usb/gadget/function/u_midi2.h         |   81 +
 6 files changed, 3192 insertions(+)
 create mode 100644 Documentation/ABI/testing/configfs-usb-gadget-midi2
 create mode 100644 drivers/usb/gadget/function/f_midi2.c
 create mode 100644 drivers/usb/gadget/function/u_midi2.h

Comments

Greg KH July 25, 2023, 4:29 p.m. UTC | #1

On Tue, Jul 25, 2023 at 08:21:59AM +0200, Takashi Iwai wrote:
> Hi,
> 
> This is a patch set for adding a USB gadget function driver for USB
> MIDI 2.0 interface.  The MIDI 2.0 support in the host side was already
> enabled since 6.5 kernel in snd-usb-audio driver.  Now, this provides
> a similar gadget functionality using the existing ALSA UMP helper
> functions.
> 
> The gadget driver provides both MIDI 2.0 and MIDI 1.0 fallback
> interfaces with one or more loopback UMP rawmidi devices.  The
> configfs implementation is flexible enough to allow users to set up
> multiple UMP Endpoints and Function Blocks.
> 
> The first patch adds the bare f_midi2 driver without configfs support,
> followed by the configfs support, MIDI 1.0 interface support and a few
> other extensions and documentation.
> 

Very cool, thanks for doing this!  All now queued up, let's see what the
builders say...

greg k-h