Hello,
I'm trying to get sound working in Linux on Cube iWork8 Ultimate tablet. It has Windows/Android dualboot, but no kernel sources for Android, unfortunately. From dmesg I see that NAU8824 codec is used, which I can't find any drivers for, except proposed patch that wasn't merged: https://lkml.org/lkml/2015/3/4/765
But, as I understand, additional code (like https://github.com/kirananto/ZENFONE2/blob/master/sound/soc/intel/board/cht_...) is needed to bridge it with Cherry Trail SoC. Any suggestions how to go about this?
Relevant lines of dmesg from stock Android kernel (where sound works): <6>[ 8.665477] nau8824_i2c_probe enter <3>[ 8.666609] snd_intel_sst: sst_platform_get_resources_edk <3>[ 8.672489] snd_intel_sst: LPE base: 0x91600000 size:0x200000snd_intel_sst: IRAM base: 0x916c0000 <3>[ 8.682557] snd_intel_sst: DRAM base: 0x91700000snd_intel_sst: SHIM base: 0x91740000 <3>[ 8.691298] snd_intel_sst: Mailbox base: 0x91744000snd_intel_sst: DDR base: 0x20000000 <6>[ 8.700428] snd_intel_sst: Enter: sst_audio_platform_init <6>[ 8.700646] snd_intel_sst: audio:set_cht_platform_config <6>[ 8.700900] snd_soc_sst_platform: sst_platform_probe is deferred <6>[ 8.700918] platform sst-platform: Driver sst-platform requests probe deferral <3>[ 8.700927] snd_intel_sst: board_name:Cherry Trail CR <6>[ 8.706611] snd_intel_sst: Registering machine device cht_nau88l24 <3>[ 8.707127] snd_intel_sst: Requesting FW fw_sst_22a8.bin now... <4>[ 8.713815] intel_sst_acpi 808622A8:00: Direct firmware load failed with error -2 <4>[ 8.724734] intel_sst_acpi 808622A8:00: Falling back to user helper <6>[ 8.789741] platform cht_nau88l24: Driver cht_nau88l24 requests probe deferral <6>[ 8.789967] cht_cr_nau88l24: Cherrytrail Machine Driver cht_nau8824 registerd <6>[ 9.077571] snd_soc_sst_platform: sst_platform_probe is deferred <3>[ 10.856689] sst-platform sst-platform: ASoC: no sink widget found for Audio Capture <3>[ 10.856693] sst-platform sst-platform: ASoC: Failed to add route media3_out -> direct -> Audio Capture <6>[ 10.873799] nau8824_codec_probe enter <6>[ 11.062658] cht_nau88l24 cht_nau88l24: snd-soc-dummy-dai <-> Headset-cpu-dai mapping ok <6>[ 11.062754] cht_nau88l24 cht_nau88l24: snd-soc-dummy-dai <-> Deepbuffer-cpu-dai mapping ok <6>[ 11.062902] cht_nau88l24 cht_nau88l24: snd-soc-dummy-dai <-> Voip-cpu-dai mapping ok <6>[ 11.063035] cht_cr_nau88l24: cht_hs_detection:Check hs insertion after 500 msec <6>[ 11.063035] cht_nau88l24 cht_nau88l24: snd-soc-dummy-dai <-> Lowlatency-cpu-dai mapping ok <6>[ 11.063383] cht_nau88l24 cht_nau88l24: snd-soc-dummy-dai <-> Probe-cpu-dai mapping ok <6>[ 11.063596] cht_nau88l24 cht_nau88l24: nau8824-aif1 <-> ssp2-port mapping ok <6>[ 11.063638] cht_nau88l24 cht_nau88l24: snd-soc-dummy-dai <-> snd-soc-dummy-dai mapping ok <6>[ 11.063674] cht_nau88l24 cht_nau88l24: snd-soc-dummy-dai <-> snd-soc-dummy-dai mapping ok <3>[ 11.063742] cht_nau88l24 cht_nau88l24: ASoC: Failed to add Headset Mic Switch: -16 <6>[ 11.095628] input: cherrytrailaud Headset Jack as /devices/platform/cht_nau88l24/sound/card1/input9 <6>[ 11.096265] cht_cr_nau88l24: snd_cht_mc_probe successful