The HP Elitepad 1000 G2 tablet has 2 headset jacks:
1. on the dock which uses the output of the codecs built-in HP-amp +
the standard IN2 input which is always used with the headset-jack.
2. on the tablet itself, this uses the line-out of the codec + an external
HP-amp, which gets enabled by the ALC5642 codec's GPIO1 pin; and IN1 for
the headset-mic.
The codec's GPIO1 is also its only IRQ output pin, so this means that
the codec's IRQ cannot be used on this tablet. Instead the jack-detect
is connected directly to GPIOs on the main SoC. The dock has a helper
chip which also detects if a headset-mic is present or not, so there
are 2 GPIOs for the jack-detect status of the dock. The tablet jack
uses a single GPIO which indicates if a jack is present or not.
Differentiating between between headphones vs a headset on the tablet jack
is done by using the usual mic-bias over-current-detection mechanism.
Regards,
Hans
Hans de Goede (5):
ASoC: rt5640: Move rt5640_disable_jack_detect() up in the rt5640.c
file
ASoC: rt5640: Delay requesting IRQ until the machine-drv calls
set_jack
ASoC: rt5640: Add optional hp_det_gpio parameter to
rt5640_detect_headset()
ASoC: rt5640: Add rt5640_set_ovcd_params() helper
ASoC: Intel: bytcr_rt5640: Add support for HP Elite Pad 1000G2
jack-detect
sound/soc/codecs/rt5640.c | 133 ++++++++++++-----------
sound/soc/codecs/rt5640.h | 6 ++
sound/soc/intel/boards/bytcr_rt5640.c | 146 +++++++++++++++++++++++++-
3 files changed, 225 insertions(+), 60 deletions(-)
--
2.31.1
