ALSA: hda: Add AW88399 HDA side codec driver for Lenovo Legion

Marco Giunta <marco_giunta@outlook.it> says:

Several Lenovo Legion laptops (Pro 7i 16IAX10H, Y9000P IAX10,
Pro 7 16AFR10H, R9000P ADR10) use AWINIC AW88399 smart amplifiers
to drive their bass woofers, connected via I2C as side codecs
to a Realtek ALC287 HDA codec.

Without a driver for these amplifiers, only the tweeters produce
sound, resulting in quiet and tinny audio.

An ASoC driver for the AW88399 already exists in-tree
(sound/soc/codecs/aw88399.c), contributed by AWINIC, but it targets
ASoC topologies and cannot drive the chip when it sits behind an
HDA controller. This series adds a proper HDA side codec driver,
following the established pattern used by the CS35L41, CS35L56,
and TAS2781 drivers.

Patch 1 extracts the device-level functions from the existing ASoC
driver into a shared library module (SND_SOC_AW88399_LIB) with a
shared header at include/sound/aw88399.h, following the CS35L41
precedent (SND_SOC_CS35L41_LIB / include/sound/cs35l41.h). This
avoids a build-time dependency on the full ASoC codec module and
ensures clean separation between the ASoC and HDA drivers.

Patches 2 through 5 prepare the shared library for use on ACPI-based
HDA systems: patch 2 extends channel assignment to work without
Device Tree properties, patch 3 adds a per-instance flag to bypass
an unreliable hardware status bit on certain boards, patch 4 adds
a firmware reload flag so that the HDA driver can signal that DSP
firmware needs to be re-uploaded after system sleep, and patch 5
adds a channel setter so that the HDA driver can configure the
amplifier without depending on ASoC-internal device headers.

NOTE ON FIRMWARE: This driver requires the firmware file
aw88399_acf.bin, which uses the same format and request path as the
existing ASoC driver. This firmware is not yet available in the
linux-firmware repository. We intend to coordinate with the AWINIC
maintainers (CC'd) to arrange its inclusion. In the meantime, users
can extract the firmware from the Windows driver and place it in
/lib/firmware/.

This work builds on the initial driver development by Yakov Till
("Lyapsus") and the bounty effort organized by Nadim Kobeissi:
https://github.com/nadimkobeissi/16iax10h-linux-sound-saga

Link: https://patch.msgid.link/DS7PR19MB77247D9AD698CF0FF37DB58BFCC62@DS7PR19MB7724.namprd19.prod.outlook.com

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