ASoC: codecs: wcd939x: read the SoundWire port switches per channel

The "HPHL/HPHR", "ADCn" and "DMICn" switches are channels of shared
SoundWire ports (ADC1-4 are channels 0-3 of the ADC_1_4 port), but
wcd939x_get_swr_port() reports a per-port flag. Once one channel of a
port is switched on, every switch on that port reads back as on:

  amixer cset name='ADC1 Switch' on   -> ADC1..ADC4 Switch all read "on"

Setting one of the others then looks like a no-op to userspace, and
"alsactl store" saves all of them as on, so a later "alsactl restore"
really enables the unused channels of the port.

Read the channel's own bit in the port's channel mask instead, drop the
now unused port_enable[] and return 0 from the put handler when the
switch does not change, as ALSA expects.

Fixes: 10f514bd172a ("ASoC: codecs: Add WCD939x Codec driver")
Link: https://lore.kernel.org/all/20251124064850.15419-6-jonathan@marek.ca/
Assisted-by: LLM
Signed-off-by: Joonhoe Kim <26rote@gmail.com>
Link: https://patch.msgid.link/20261007123954.1709-1-26rote@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

0 files changed, 0 insertions, 0 deletions