apalis-imx8x: udev: add symlink to adc raw data

Create symlinks for each supported by Apalis iMX8QXP ADC channels,
standardizing names as apalis-adcX, according to the Apalis signal names
table.

Related-to: ELB-2839
Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/recipes-core/udev/files/apalis-imx8x/toradex-adc.sh b/recipes-core/udev/files/apalis-imx8x/toradex-adc.sh
new file mode 100755
index 0000000..43aae6d
--- /dev/null
+++ b/recipes-core/udev/files/apalis-imx8x/toradex-adc.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env sh
+#
+# Called from udev. Compatible to apalis-imx8x.
+#
+# Create/remove symlinks to/from the files with raw ain data.
+
+# Map the ADC lines:
+# apalis-adc{0..3} -> ADMA.ADC.IN{0,1,4,5}
+
+if [ "$ACTION" = "add" ]; then
+    ln -s "/sys$DEVPATH/in_voltage0_raw" /dev/apalis-adc0
+    ln -s "/sys$DEVPATH/in_voltage1_raw" /dev/apalis-adc1
+    ln -s "/sys$DEVPATH/in_voltage4_raw" /dev/apalis-adc2
+    ln -s "/sys$DEVPATH/in_voltage5_raw" /dev/apalis-adc3
+elif [ "$ACTION" = "remove" ]; then
+    rm -f /dev/apalis-adc0
+    rm -f /dev/apalis-adc1
+    rm -f /dev/apalis-adc2
+    rm -f /dev/apalis-adc3
+fi
+