verdin-imx8mp: udev: add symlink rules

Create stable symlinks mapping Verdin family function names to the kernel
device files.

Related-to: ELB-3293
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/recipes-core/udev/files/verdin-imx8mp/toradex-adc.sh b/recipes-core/udev/files/verdin-imx8mp/toradex-adc.sh
new file mode 100755
index 0000000..1591170
--- /dev/null
+++ b/recipes-core/udev/files/verdin-imx8mp/toradex-adc.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env sh
+#
+# Called from udev. Compatible to verdin-imx8mp.
+#
+# Create/remove symlinks to/from the files with raw adc data.
+
+# Map the ADC lines:
+# verdin-adc{1..4} -> TLA2024 ADC{3,2,1,0}
+
+if [ "$ACTION" = "add" ]; then
+    ln -s "/sys$DEVPATH/in_voltage0_raw" /dev/verdin-adc4
+    ln -s "/sys$DEVPATH/in_voltage1_raw" /dev/verdin-adc3
+    ln -s "/sys$DEVPATH/in_voltage2_raw" /dev/verdin-adc2
+    ln -s "/sys$DEVPATH/in_voltage3_raw" /dev/verdin-adc1
+elif [ "$ACTION" = "remove" ]; then
+    rm -f /dev/verdin-adc1
+    rm -f /dev/verdin-adc2
+    rm -f /dev/verdin-adc3
+    rm -f /dev/verdin-adc4
+fi
+