ALSA: usb-audio: Support jack detection on Dell dock
[ Upstream commit
4b8ea38fabab45ad911a32a336416062553dfe9c ]
The Dell WD15 dock has a headset and a line out port. Add support for
detecting if a jack is inserted into one of these ports.
For the headset jack, additionally determine if a mic is present.
The WD15 contains an ALC4020 USB audio controller and ALC3263 audio codec
from Realtek. It is a UAC 1 device, and UAC 1 does not support jack
detection. Instead, jack detection works by sending HD Audio commands over
vendor-type USB messages.
I found out how it works by looking at USB captures on Windows.
The audio codec is very similar to the one supported by
sound/soc/codecs/rt298.c / rt298.h, some constant names and the mic
detection are adapted from there. The realtek_add_jack function is adapted
from build_connector_control in sound/usb/mixer.c.
I tested this on a WD15 dock with the latest firmware.
Signed-off-by: Jan Schär <jan@jschaer.ch>
Link: https://lore.kernel.org/r/20220627171855.42338-1-jan@jschaer.ch
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Stable-dep-of:
4413665dd6c5 ("ALSA: usb-audio: Add quirks for Dell WD19 dock")
Signed-off-by: Sasha Levin <sashal@kernel.org>
projects / linux / commit