[alsa-devel] [PATCH 2/2] alsa-info: add ACPI device status

[Pierre-Louis Bossart]

BIOS vendors typically reuse the same definitions between different
platforms and expose the relevant hardware by changing the value of
the _STA method.

For example on the Asus T100HA, there are 3 HID values for audio
codecs in the DSDT table but two have a zero status and will be
ignored by the ACPI subsystem.

$ more /sys/bus/acpi/devices/10EC*/status
::::::::::::::
/sys/bus/acpi/devices/10EC3270:00/status
::::::::::::::
15
::::::::::::::
/sys/bus/acpi/devices/10EC5640:00/status
::::::::::::::
0
::::::::::::::
/sys/bus/acpi/devices/10EC5648:00/status
::::::::::::::
0

This information is very useful to figure out which HIDs/quirks need
to be supported. Add log to alsa-info.sh to only expose non-zero
results of the ACPI _STA method, e.g.

!!ACPI Device Status Information
!!---------------

/sys/bus/acpi/devices/10EC3270:00/status 	 15

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 alsa-info/alsa-info.sh | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/alsa-info/alsa-info.sh b/alsa-info/alsa-info.sh
index 9684c6f..cda4125 100755
--- a/alsa-info/alsa-info.sh
+++ b/alsa-info/alsa-info.sh
@@ -441,6 +441,16 @@ elif [ -x $DMIDECODE ]; then
     DMI_BOARD_NAME=$($DMIDECODE -s baseboard-product-name 2>/dev/null)
 fi
 
+# Check for ACPI device status
+if [ -d /sys/bus/acpi/devices ]; then
+    for f in /sys/bus/acpi/devices/*/status; do
+	ACPI_STATUS=$(cat $f 2>/dev/null);
+	if [[ "$ACPI_STATUS" -ne 0 ]]; then
+	    echo $f $'\t' $ACPI_STATUS >>$TEMPDIR/acpidevicestatus.tmp;
+	fi
+    done
+fi
+
 cat /proc/asound/modules 2>/dev/null|awk {'print $2'}>$TEMPDIR/alsamodules.tmp
 cat /proc/asound/cards >$TEMPDIR/alsacards.tmp
 if [[ ! -z "$LSPCI" ]]; then
@@ -487,6 +497,12 @@ echo "Board Vendor:      $DMI_BOARD_VENDOR" >> $FILE
 echo "Board Name:        $DMI_BOARD_NAME" >> $FILE
 echo "" >> $FILE
 echo "" >> $FILE
+echo "!!ACPI Device Status Information" >> $FILE
+echo "!!---------------" >> $FILE
+echo "" >> $FILE
+cat $TEMPDIR/acpidevicestatus.tmp >> $FILE
+echo "" >> $FILE
+echo "" >> $FILE
 echo "!!Kernel Information" >> $FILE
 echo "!!------------------" >> $FILE
 echo "" >> $FILE
-- 
2.7.4