[PATCH 0/3] ASoC: samsung: midas-audio: Add GPIO-based headset jack detection

[Artur Weber]

Many of Samsung's Exynos 4 devices share the same midas-audio driver
to handle the codec setup. While most of these devices, including the
Midas itself, use the jack detection provided by the WM8994 driver,
other devices such as the Samsung Galaxy Tab 3 8.0 (lt01) use two GPIOs
and an ADC channel to determine jack insertion, the jack's type, and
button presses (for headsets with volume up/down/play buttons).

In the downstream kernel, this behavior is implemented in the sec-jack
driver[1], and the per-device settings are configured in *-jack.c files
in the mach folder (see e.g. the Tab 3's implementation[2]).

This patchset implements this mechanism in the midas_wm1811.c driver,
and adds new DTS options to allow for its configuration. It also
enables jack detection for the Samsung Galaxy Tab 3 8.0.

A very similar mechanism was already present in the aries_wm8994.c
driver[3]; this implementation heavily borrows from it, though there
are a few extra cleanups as well.

Signed-off-by: Artur Weber <aweber.kernel at gmail.com>

[1] https://github.com/gr8nole/android_kernel_samsung_smdk4x12/blob/lineage-14.1/drivers/misc/sec_jack.c
[2] https://github.com/gr8nole/android_kernel_samsung_smdk4x12/blob/lineage-14.1/arch/arm/mach-exynos/tab3-jack.c
[3] https://github.com/torvalds/linux/blob/master/sound/soc/samsung/aries_wm8994.c

---
Artur Weber (3):
      ASoC: dt-bindings: samsung,midas-audio: Add GPIO-based headset jack detection
      ASoC: samsung: midas_wm1811: Add GPIO-based headset jack detection
      ARM: dts: samsung: exynos4212-tab3: Fix headset mic, add jack detection

 .../bindings/sound/samsung,midas-audio.yaml        |  30 +++
 arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi     |  23 +-
 sound/soc/samsung/Kconfig                          |   2 +-
 sound/soc/samsung/midas_wm1811.c                   | 265 ++++++++++++++++++++-
 4 files changed, 305 insertions(+), 15 deletions(-)
---
base-commit: e67572cd2204894179d89bd7b984072f19313b03
change-id: 20240502-midas-wm1811-gpio-jack-b10226b17ecc

Best regards,
-- 
Artur Weber <aweber.kernel at gmail.com>