sound_card_init: `DSM` uses celsius as the unit of temperature
To make `DSM` more readable and maintainable, we:
1. Uses celsius as the unit of temperature in `DSM` as it's more easy
to understand.
2. Allow each amps to define the conversion between celsius and
the unit in VPD::dsm_calib_temp in `DSM`. Max98390 uses its dsm unit
for VPD::dsm_calib_temp and needs to convert it to celsius
to communicate with `DSM` struct.
3. Replace rdc_diff with rdc_to_ohm as compute the rdc difference in
real DC resistence is more general.
BUG=b:157210111
TEST=/sbin/initctl start sound_card_init SOUND_CARD_ID=sofcmlmax98390d
Change-Id: I8dbcc44b365192657f382ae8a43e091354f2e4cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/2650004
Tested-by: Judy Hsiao <judyhsiao@chromium.org>
Reviewed-by: Chih-Yang Hsia <paulhsia@chromium.org>
Commit-Queue: Judy Hsiao <judyhsiao@chromium.org>
3 files changed
