inMusic Kernel Modules

Almost everything in /usr/lib/modules/[kernel]/kernel is stock mainline Linux. Across every 5.0.4 firmware I can unpack, only seven modules are inMusic's own, and all seven are audio drivers.

They ship as unstripped ELF relocatable objects with intact symbol tables, so they load into Ghidra with every function already named. There's no DWARF debug info in any of them.

Where to find them

Every RK3288 device reports ID=az01 in /usr/lib/os-release and runs the same kernel, so the same six modules ship across the whole platform. There's no need to pull them per device. Confirmed on the 5.0.4 firmware for the Prime 2, Prime 4, Prime 4 Plus, Prime GO, Prime GO Plus, SC5000, SC5000M, SC6000, SC6000M, SC Live 2 and SC Live 4.

Platform	Path
`AZ01`	`/usr/lib/modules/6.6.119-az01-2025-12-17-rt67/kernel/sound/soc/`
`AZ04`	`/usr/lib/modules/6.18.9-imb-2026-02-06-rt3/kernel/sound/soc/`

Module Overview

Module	Description	Role	License	Size	Funcs
`snd-soc-inmusic-jp07`	InMusic JP07 ASoC codec driver	Codec	`GPL v2`	16.8 KB	10
`snd-soc-rockchip-inmusic-jp07`	InMusic JP07 machine ASoC driver	Machine	`GPL v2`	17.5 KB	10
`snd-soc-inmusic-nh08`	InMusic NH08 ASoC codec driver	Codec	`GPL v2`	12.4 KB	7
`snd-soc-rockchip-inmusic-nh08`	InMusic NH08 machine ASoC driver	Machine	`GPL v2`	8.8 KB	10
`snd-soc-tas5805m-inmusic`	TAS5805M audio amplifier driver	Amplifier	`GPL`	24.0 KB	25
`snd-soc-eta5805`	ETA5805 Audio Amplifier Driver	Amplifier	`GPL v2`	13.6 KB	13
`snd-soc-inmusic-az04`	inMusic AZ04 ASoC codec driver	Codec	`GPL v2`	13.5 KB	5

Authorship

Every one of these is by the same person, and the address changes between platform generations:

Modules	Author
All six `AZ01` modules	`John Keeping <john@metanate.com>`
`snd-soc-inmusic-az04`	`John Keeping <jkeeping@inmusicbrands.com>`

Metanate is a UK software consultancy, so the AZ01 work looks like it was contracted out, with the newer AZ04 driver written in-house.

Two of the codecs leak their in-tree source paths in assertion strings:

/sound/soc/codecs/inmusic-jp07.c
/sound/soc/codecs/inmusic-nh08.c

Vermagic

vermagic has to match the running kernel exactly or insmod refuses the module, so these are only loadable on their own firmware's kernel.

Platform	`vermagic`
`AZ01`	`6.6.119-az01-2025-12-17-rt67 SMP preempt_rt ARMv7 p2v8`
`AZ04`	`6.18.9-imb-2026-02-06-rt3 SMP preempt_rt mod_unload aarch64`

Note mod_unload is only set on AZ04 - on AZ01 module unloading is compiled out.

Device Tree Aliases

This is the most useful part of the metadata. Rather than one driver per product, there are two codec/machine pairs whose of_match tables cover the entire fleet.

snd-soc-inmusic-jp07 (codec)

inmusic,acva-audio-codec   inmusic,acvk-audio-codec   inmusic,acvm-audio-codec
inmusic,acvr-audio-codec   inmusic,ada2-audio-codec   inmusic,az05-audio-codec
inmusic,hg02-audio-codec   inmusic,hg03-audio-codec   inmusic,hg04-audio-codec
inmusic,hg08-audio-codec   inmusic,hv01-audio-codec   inmusic,jc16-audio-codec
inmusic,jp07-audio-codec   inmusic,jp11-audio-codec   inmusic,jp12-audio-codec
inmusic,ldmd-audio-codec   inmusic,mg01-audio-codec

snd-soc-rockchip-inmusic-jp07 (machine)

inmusic,acva-audio   inmusic,acvk-audio   inmusic,acvm-audio   inmusic,acvr-audio
inmusic,ada2-audio   inmusic,az05-audio   inmusic,hg02-audio   inmusic,hg03-audio
inmusic,hg04-audio   inmusic,hg08-audio   inmusic,hv01-audio   inmusic,jc16-audio
inmusic,jp07-audio   inmusic,jp11-audio   inmusic,jp12-audio   inmusic,jp20-audio
inmusic,jp21-audio   inmusic,ldmd-audio   inmusic,ldmf-audio   inmusic,mg01-audio
inmusic,nh09-audio

snd-soc-inmusic-nh08 (codec)

inmusic,jp20-audio-codec   inmusic,jp21-audio-codec   inmusic,ldmf-audio-codec
inmusic,nh08-audio-codec   inmusic,nh09-audio-codec   inmusic,nh10-audio-codec

snd-soc-rockchip-inmusic-nh08 (machine)

inmusic,nh08-audio inmusic,nh10-audio

Amplifiers and AZ04

snd-soc-tas5805m-inmusic:  ti,tas5805m   i2c:tas5805m
snd-soc-eta5805:           eta,eta5805
snd-soc-inmusic-az04:      inmusic,az04-codec

Undocumented Hardware IDs

The of_match tables name five hardware IDs that don't appear anywhere else in this repository, in any DTS or on any Brands page:

Hardware ID	Notes
`ACVK`	`ACV` prefix, so likely an Akai MPC variant
`ADA2`	Unknown prefix, not seen elsewhere
`HG08`	`HG` prefix, so likely a HeadRush variant
`LDMD`	Unknown prefix, not seen elsewhere
`LDMF`	Uses the `NH08` codec, so likely an SC Live style device

JP12, NH09, and HG08 are also in these tables and are mentioned elsewhere in this repository, but I have no DTS for either.

Device Tree Properties

The machine drivers read these properties from their sound node:

Property	Used by	Meaning
`inmusic,cpu`	Both pairs	Phandle to the I2S CPU DAI
`inmusic,codec`	`jp07` pair	Phandle to the codec
`inmusic,master-codec`	`nh08` pair	Phandle to the primary codec
`inmusic,speaker-codec`	`nh08` pair	Phandle to the speaker amplifier
`inmusic,master-slave`	`jp07` pair	Clock master/slave selection
`clksel0`/`clksel1`	`jp07` pair	GPIOs for sample rate clock select

The jp07 machine driver also selects between codec-clk-master and codec-clk-slave pinctrl states.

The codecs take mute, reset and enable GPIOs. On AZ04 the codec additionally reads its whole DAI capability set from the device tree, via inmusic,playback-channels, inmusic,capture-channels and inmusic,pcm-rates.

Extracting Them

Unpack the firmware per Extracting, then:

find [rootfs]/usr/lib/modules -name '*.ko' | while read -r k; do
  modinfo "$k" | grep -qi inmusic && echo "$k"
done

modinfo works fine on a foreign-architecture module, so this can run on your desktop.

12 August 2026