Hi Takashi, This series is preparation for adding support for the Focusrite Scarlett 4th Gen devices. It applies on top of the previous series https://lore.kernel.org/linux-sound/cover.1703001053.git.g@xxxxx/ "ALSA: scarlett2: Firmware Upgrade and Error Handling Improvements". There should be no notable functional changes in this series, just refactoring/restructuring/renaming/reformatting. Regards, Geoffrey. Geoffrey D. Bennett (23): ALSA: scarlett2: Simplify enums by removing explicit values ALSA: scarlett2: Infer has_msd_mode from config items ALSA: scarlett2: Infer standalone switch from config items ALSA: scarlett2: Check for phantom persistence config item ALSA: scarlett2: Check presence of mixer using mux_assignment ALSA: scarlett2: Add config set struct ALSA: scarlett2: Remove scarlett2_config_sets array ALSA: scarlett2: Add check for config_item presence ALSA: scarlett2: Refactor scarlett2_usb_set_config() ALSA: scarlett2: Refactor scarlett2_config_save() ALSA: scarlett2: Formatting fixes ALSA: scarlett2: Parameterise notifications ALSA: scarlett2: Change num_mux_* from int to u8 ALSA: scarlett2: Refactor common port_count lookups ALSA: scarlett2: Remove struct scarlett2_usb_volume_status ALSA: scarlett2: Split dim_mute_update from vol_updated ALSA: scarlett2: Remove line_out_hw_vol device info entry ALSA: scarlett2: Allow for interfaces without per-channel volume ALSA: scarlett2: Add scarlett2_mixer_value_to_db() ALSA: scarlett2: Add #define for SCARLETT2_MIX_MAX ALSA: scarlett2: Rename db_scale_scarlett2_gain to volume ALSA: scarlett2: Split input_other into level/pad/air/phantom ALSA: scarlett2: Split direct_monitor out from monitor_other sound/usb/mixer_scarlett2.c | 1536 ++++++++++++++++++++--------------- 1 file changed, 879 insertions(+), 657 deletions(-) -- 2.43.0