From 41ebdf6d19a1b8af2e06f274d711823bdb345f29 Mon Sep 17 00:00:00 2001
From: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Date: Mon, 3 Aug 2020 18:59:57 +0300
Subject: apalis-imx6: udev: add symlink to adc raw data

Create symlinks for each supported by Apalis iMX6 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>
---
 .../udev/files/apalis-imx6/99-toradex.rules         |  1 +
 recipes-core/udev/files/apalis-imx6/toradex-adc.sh  | 21 +++++++++++++++++++++
 recipes-core/udev/files/toradex-adc.sh              |  4 ++++
 recipes-core/udev/udev-toradex-rules.bb             |  3 +++
 4 files changed, 29 insertions(+)
 create mode 100755 recipes-core/udev/files/apalis-imx6/toradex-adc.sh
 create mode 100755 recipes-core/udev/files/toradex-adc.sh

diff --git a/recipes-core/udev/files/apalis-imx6/99-toradex.rules b/recipes-core/udev/files/apalis-imx6/99-toradex.rules
index 58c3a86..f29daae 100644
--- a/recipes-core/udev/files/apalis-imx6/99-toradex.rules
+++ b/recipes-core/udev/files/apalis-imx6/99-toradex.rules
@@ -13,3 +13,4 @@ ACTION=="add", SUBSYSTEM=="spidev", KERNELS=="200c000.*spi", SYMLINK+="apalis-sp
 KERNEL=="mmcblk[0-9]", ENV{DEVTYPE}=="disk", KERNELS=="2198000.usdhc", SYMLINK+="emmc"
 KERNEL=="mmcblk[0-9]boot[0-9]", ENV{DEVTYPE}=="disk", KERNELS=="2198000.usdhc", SYMLINK+="emmc-boot%n"
 KERNEL=="mmcblk[0-9]p[0-9]", ENV{DEVTYPE}=="partition", KERNELS=="2198000.usdhc", SYMLINK+="emmc-part%n"
+SUBSYSTEM=="iio", KERNELS=="iio:device0", RUN+="/etc/udev/scripts/toradex-adc.sh"
diff --git a/recipes-core/udev/files/apalis-imx6/toradex-adc.sh b/recipes-core/udev/files/apalis-imx6/toradex-adc.sh
new file mode 100755
index 0000000..9776fda
--- /dev/null
+++ b/recipes-core/udev/files/apalis-imx6/toradex-adc.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env sh
+#
+# Called from udev. Compatible to apalis-imx6.
+#
+# Create/remove symlinks to/from the files with raw ain data.
+
+# Map the ADC lines:
+# apalis-adc{0..3} -> STMPE811 ADC{4,5,6,7} in terms of the driver.
+LINES=4
+START=4
+
+if [ "$ACTION" = "add" ]; then
+    for idx in `seq 0 $((LINES-1))`; do
+        ln -s "/sys$DEVPATH/in_voltage$((START+idx))_raw" /dev/apalis-ain$idx
+    done
+elif [ "$ACTION" = "remove" ]; then
+    for idx in `seq 0 $((LINES-1))`; do
+        rm -f /dev/apalis-ain$idx
+    done
+fi
+
diff --git a/recipes-core/udev/files/toradex-adc.sh b/recipes-core/udev/files/toradex-adc.sh
new file mode 100755
index 0000000..eade822
--- /dev/null
+++ b/recipes-core/udev/files/toradex-adc.sh
@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+#
+# Stub script. Just to satisfy the udev recipe.
+
diff --git a/recipes-core/udev/udev-toradex-rules.bb b/recipes-core/udev/udev-toradex-rules.bb
index dc6248a..a4833ca 100644
--- a/recipes-core/udev/udev-toradex-rules.bb
+++ b/recipes-core/udev/udev-toradex-rules.bb
@@ -4,11 +4,14 @@ LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda
 SRC_URI = "\
     file://99-toradex.rules \
     file://10-toradex-wifi-ifnames.link \
+    file://toradex-adc.sh \
 "
 
 do_install () {
     install -d ${D}${sysconfdir}/udev/rules.d
+    install -d ${D}${sysconfdir}/udev/scripts
     install -d ${D}${sysconfdir}/systemd/network
     install -m 0644 ${WORKDIR}/99-toradex.rules ${D}${sysconfdir}/udev/rules.d/
+    install -m 0755 ${WORKDIR}/toradex-adc.sh ${D}${sysconfdir}/udev/scripts/
     install -m 0644 ${WORKDIR}/10-toradex-wifi-ifnames.link ${D}${sysconfdir}/systemd/network/
 }
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