[PATCH v4 0/9] 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

---
Changes in v4:
- Replaced manual regulator toggles with SND_SOC_DAPM_REGULATOR_SUPPLY,
  both for existing mic bias regulators and for the new headset mic bias
  regulator
- Link to v3: https://lore.kernel.org/r/20240519-midas-wm1811-gpio-jack-v3-0-0c1736144c0e@gmail.com

Changes in v3:
- Re-added pipe (|) character to samsung,headset-button-threshold-microvolt
  description to prevent it from being parsed as a mapping (fixes syntax
  error)
- Split out "ASoC: dt-bindings: samsung,midas-audio: Add GPIO-based headset
  jack detection" into two patches
- Link to v2: https://lore.kernel.org/r/20240508-midas-wm1811-gpio-jack-v2-0-b4d36cd02c6e@gmail.com

Changes in v2:
- Added vendor prefix to threshold properties
- Added separate headset mic bias regulator
- Changed some cases of dev_err + return with return dev_err_probe
- Added an extra patch to replace some previous dev_err + return cases
  with dev_err_probe
- Moved tab3 DTS wm1811 codec config changes to separate commit

---
Artur Weber (9):
      ASoC: dt-bindings: samsung,midas-audio: Add headset mic bias supply
      ASoC: dt-bindings: samsung,midas-audio: Add GPIO-based headset jack detection
      ASoC: samsung: midas_wm1811: Use SND_SOC_DAPM_REGULATOR_SUPPLY for bias regulators
      ASoC: samsung: midas_wm1811: Add headset mic bias supply support
      ASoC: samsung: midas_wm1811: Add GPIO-based headset jack detection
      ASoC: samsung: midas_wm1811: Use dev_err_probe where appropriate
      ARM: dts: samsung: exynos4212-tab3: Fix headset mic, add jack detection
      ARM: dts: samsung: exynos4212-tab3: Add MCLK2 clock to WM1811 codec config
      ARM: dts: samsung: exynos4212-tab3: Drop interrupt from WM1811 codec

 .../bindings/sound/samsung,midas-audio.yaml        |  33 ++
 arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi     |  31 +-
 sound/soc/samsung/Kconfig                          |   2 +-
 sound/soc/samsung/midas_wm1811.c                   | 348 +++++++++++++++++----
 4 files changed, 343 insertions(+), 71 deletions(-)
---
base-commit: a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6
change-id: 20240502-midas-wm1811-gpio-jack-b10226b17ecc

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