/usr/share/alsa/init/00main is in alsa-utils 1.1.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | # This is toplevel configuration for for 'alsactl init'.
# See 'man alsactl_init' for syntax.
# set root device directory in sysfs for soundcard for ATTR{} command
CONFIG{sysfs_device}="/class/sound/card$cardinfo{card}/device"
ACCESS!="$sysfsroot$config{sysfs_device}", \
CONFIG{sysfs_device}="/class/sound/controlC$cardinfo{card}/device"
# test for extra commands
ENV{CMD}=="help", INCLUDE="help", GOTO="00main_end"
ENV{CMD}=="info", INCLUDE="info", GOTO="00main_end"
ENV{CMD}=="default", INCLUDE="default", GOTO="00main_end"
ENV{CMD}=="test", INCLUDE="test", GOTO="00main_end"
ENV{CMD}=="*", ERROR="Unknown command '$env{CMD}'\n", GOTO="00main_end"
# include files with real configuration
#
# steps are:
# 1) look for preinit subdirectory and parse all files in it
# 2) if RESULT=="skip", skip ALSA standard configuration files
# 3) do ALSA standard configuration
# 4) look for postinit subdirectory and parse all files in it
# 5) if RESULT!="true", initialize hardware using a guess method,
# print an error message and return with exit code 99
# 6) return with exit code 0 (success)
#
RESULT="unknown"
ACCESS=="preinit", INCLUDE="preinit"
RESULT=="skip", GOTO="init_end"
# real ALSA configuration database
CARDINFO{driver}=="HDA-Intel", INCLUDE="hda", GOTO="init_end"
CARDINFO{driver}=="CA0106", INCLUDE="ca0106", GOTO="init_end"
CARDINFO{driver}=="Test", INCLUDE="test", GOTO="init_end"
LABEL="init_end"
ACCESS=="postinit", INCLUDE="postinit"
RESULT=="true", GOTO="00_mainend"
ERROR="Found hardware: \"$cardinfo{driver}\" \"$cardinfo{mixername}\" \"$cardinfo{components}\" \"$attr{subsystem_vendor}\" \"$attr{subsystem_device}\"\n"
ERROR="Hardware is initialized using a generic method\n"
INCLUDE="default"
EXIT="99"
#
# label identifying end of main file
#
LABEL="00main_end"
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