Add RevPi specific udev rules

Add RevPi specific udev rules and helper script for mac address
configuration from HAT eeprom. The ruleset will ensure that the following
things behave similar to a stock RevPi OS:

- Alias for RS485 interfaces (eg. /dev/ttyRS485)
- Set mac address from HAT EEPROM for interfaces without own eeprom
- Set interfaces names according to device markings
- Use correct interface names for PiBridge ethernet interfaces (without this
  gateways can't work with piControl)

Changelog-entry: Add RevPi udev rules
Signed-off-by: Nicolai Buchwitz <n.buchwitz@kunbus.com>

layers/meta-balena-raspberrypi/recipes-core/extra-udev-rules/extra-udev-rules.bbappend

@@ -1,10 +1,20 @@
 FILESEXTRAPATHS:append := ":${THISDIR}/files"
 
 SRC_URI:append = " \
+	file://50-revpi.rules \
 	file://86-nm-unmanaged-fin.rules \
+	file://revpi_mac \
 	"
 
 do_install:append:fincm3() {
 	# Install balenaFin uAP interface rules
 	install -D -m 0644 ${WORKDIR}/86-nm-unmanaged-fin.rules ${D}/lib/udev/rules.d/86-nm-unmanaged-fin.rules
 }
+
+do_install:append:revpi() {
+	# Install RevPi specific rules
+	install -D -m 0644 ${WORKDIR}/50-revpi.rules ${D}/lib/udev/rules.d/50-revpi.rules
+	install -D -m 0755 ${WORKDIR}/revpi_mac ${D}/lib/udev/revpi_mac
+}
+
+RDEPENDS:${PN}:append:revpi = "bash"

layers/meta-balena-raspberrypi/recipes-core/extra-udev-rules/files/50-revpi.rules

@@ -0,0 +1,74 @@
+# SPDX-FileCopyrightText: 2024 KUNBUS GmbH
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+#
+# NOTE: Original file was downloaded from https://gitlab.com/revolutionpi/revpi-base-files/-/blob/master/udev/50-revpi.rules?ref_type=heads
+#
+
+PROGRAM="/bin/grep -Fz -m 1 'kunbus,revpi-' /sys/firmware/devicetree/base/compatible"
+RESULT=="kunbus,revpi-core", GOTO="revpi_core"
+RESULT=="kunbus,revpi-core-2022", GOTO="revpi_core"
+RESULT=="kunbus,revpi-core-s-2022", GOTO="revpi_core"
+RESULT=="kunbus,revpi-core-se-2022", GOTO="revpi_core"
+RESULT=="kunbus,revpi-connect", GOTO="revpi_connect"
+RESULT=="kunbus,revpi-connect-se", GOTO="revpi_connect"
+RESULT=="kunbus,revpi-connect4", GOTO="revpi_connect4"
+RESULT=="kunbus,revpi-compact", GOTO="revpi_compact"
+RESULT=="kunbus,revpi-flat-s-2022", GOTO="revpi_flat_s"
+RESULT=="kunbus,revpi-flat", GOTO="revpi_flat"
+GOTO="revpi_end"
+
+LABEL="revpi_core"
+# The following two rules are disabled as the quirks service is not present on Balena OS
+# ACTION=="add", SUBSYSTEM=="net", DEVPATH=="*/spi0.0/net/*eth*", NAME="pileft", TAG+="systemd", ENV{SYSTEMD_WANTS}="pileft-quirks.service"
+# ACTION=="add", SUBSYSTEM=="net", DEVPATH=="*/spi0.1/net/*eth*", NAME="piright", TAG+="systemd", ENV{SYSTEMD_WANTS}="piright-quirks.service"
+ACTION=="add", SUBSYSTEM=="net", DEVPATH=="*/usb1/1-1/1-1.1/1-1.1:1.0/*", NAME="eth0"
+GOTO="revpi_end"
+
+LABEL="revpi_connect"
+ACTION=="add", SUBSYSTEM=="tty", DEVPATH=="*/usb1/1-1/1-1.5/1-1.5.2/*", SYMLINK+="ttyRS485"
+ACTION=="add", SUBSYSTEM=="tty", DEVPATH=="*/usb1/1-1/1-1.5/1-1.5.3/*", SYMLINK+="ttyConBridge"
+# This rule doesn't match on the RevPi Connect SE as it has no ethernet on the pibridge.
+ACTION=="add", SUBSYSTEM=="net", DEVPATH=="*/spi0.1/net/*eth*", NAME="pileft"
+
+ACTION=="add", SUBSYSTEM=="net", DEVPATH=="*/usb1/1-1/1-1.1/1-1.1:1.0/*", NAME="eth0"
+ACTION=="add", SUBSYSTEM=="net", DEVPATH=="*/usb1/1-1/1-1.5/1-1.5.1/1-1.5.1:1.0/*", NAME="eth1"
+GOTO="revpi_end"
+
+LABEL="revpi_connect4"
+ACTION=="add", SUBSYSTEM=="tty", DEVPATH=="*/fe201a00.serial/tty/*", SYMLINK+="ttyRS485"
+ACTION=="add", SUBSYSTEM=="net", ATTR{type}=="1", DEVPATH=="*/fd580000.ethernet/net/*", NAME="eth0", PROGRAM="revpi_mac %k 0"
+ACTION=="add", SUBSYSTEM=="net", ATTR{type}=="1", DEVPATH=="*/usb2/2-3/2-3:1.0/net/*", NAME="eth1"
+ACTION=="add", SUBSYSTEM=="net", ATTR{type}=="1", DEVPATH=="*/fe300000.mmcnr/mmc_host/mmc1/mmc1:0001/mmc1:0001:1/net/*", NAME="wlan0", PROGRAM="revpi_mac %k 2"
+GOTO="revpi_end"
+
+LABEL="revpi_compact"
+ACTION=="add", ENV{OF_COMPATIBLE_0}=="fairchild,74hc595", SYMLINK+="gpiochip_dout"
+ACTION=="add", ENV{OF_COMPATIBLE_0}=="maxim,max31913", SYMLINK+="gpiochip_din"
+ACTION=="add", SUBSYSTEM=="net", DEVPATH=="*/usb1/1-1/1-1.1/1-1.1:1.0/*", NAME="eth0"
+ACTION=="add", SUBSYSTEM=="net", DEVPATH=="*/spi0.2/net/*eth*", NAME="eth1"
+ACTION=="add", SUBSYSTEM=="tty", DEVPATH=="*/3f201000.serial/tty/*", SYMLINK+="ttyRS485"
+GOTO="revpi_end"
+
+LABEL="revpi_flat"
+ACTION=="add", SUBSYSTEM=="tty", DEVPATH=="*/*201000.serial/tty/*", SYMLINK+="ttyRS485-0"
+ACTION=="add", SUBSYSTEM=="tty", DEVPATH=="*/*215040.serial/tty/*", SYMLINK+="ttyRS485-1"
+ACTION=="add", ENV{SYSTEMD_WANTS}="hdmi-disable.service"
+ACTION=="add", SUBSYSTEM=="net", DEVPATH=="*/usb1/1-1/1-1.1/1-1.1:1.0/*", NAME="eth0"
+ACTION=="add", SUBSYSTEM=="net", DEVPATH=="*/usb1/1-1/1-1.4/1-1.4:1.0/*", NAME="eth1"
+GOTO="revpi_end"
+
+LABEL="revpi_flat_s"
+ACTION=="add", ENV{SYSTEMD_WANTS}="hdmi-disable.service"
+ACTION=="add", SUBSYSTEM=="tty", DEVPATH=="*/fe201600.serial/tty/*", SYMLINK+="ttyRS485-0"
+ACTION=="add", SUBSYSTEM=="tty", DEVPATH=="*/fe201800.serial/tty/*", SYMLINK+="ttyRS485-1"
+ACTION=="add", SUBSYSTEM=="net", DEVPATH=="*/usb1/1-1/1-1.1/1-1.1:1.0/*", NAME="eth0"
+ACTION=="add", SUBSYSTEM=="net", DEVPATH=="*/usb1/1-1/1-1.4/1-1.4:1.0/*", NAME="eth1"
+ACTION=="add", SUBSYSTEM=="net", ATTR{type}=="1", DEVPATH=="*/spi5/spi5.1/net/swp1", NAME="swp1", PROGRAM="revpi_mac %k 2"
+ACTION=="add", SUBSYSTEM=="net", ATTR{type}=="1", DEVPATH=="*/spi5/spi5.1/net/swp2", NAME="swp2", PROGRAM="revpi_mac %k 3"
+ACTION=="add", SUBSYSTEM=="net", ATTR{type}=="1", DEVPATH=="*/spi5/spi5.1/net/swp3", NAME="swp3", PROGRAM="revpi_mac %k 4"
+ACTION=="add", SUBSYSTEM=="net", ATTR{type}=="1", DEVPATH=="*/mmc3\:0001\:1/net/*", NAME="wlan0", PROGRAM="revpi_mac %k 5"
+GOTO="revpi_end"
+
+LABEL="revpi_end"

layers/meta-balena-raspberrypi/recipes-core/extra-udev-rules/files/revpi_mac

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# SPDX-FileCopyrightText: 2023 KUNBUS GmbH
+# 
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+DEVNAME=$1
+OFFSET=$2
+
+if [ ! -f /proc/device-tree/hat/custom_5 ]; then
+    exit 1
+fi
+
+read -r BASE_MAC < /proc/device-tree/hat/custom_5
+if [ -z "$BASE_MAC" ]; then
+    exit 2
+fi
+
+MAC_NUM="${BASE_MAC//:/}"
+OFFSET_NUM=$(printf "%x" $((16#$MAC_NUM + $OFFSET)))
+OFFSET_MAC="$(echo "$OFFSET_NUM" | sed 's/.\{2\}/&:/g')"
+OFFSET_MAC="${OFFSET_MAC::-1}"
+
+/sbin/ip link set "$DEVNAME" address "$OFFSET_MAC"
+
+exit $?