usb_driver: add a script to install Cypress usb driver

The new DVKs of the cc8mn, cc8mm and ccmp1 have a new ftdi
usb to serial chip that is recognized as a thermal device by default.

With the install_usb_driver.sh script this driver is replaced
to a USB to serial driver.

This script is included for the needed platforms in the zip
installer provided in the getting started.

https://onedigi.atlassian.net/browse/DEL-8126

Signed-off-by: Francisco Gil <francisco.gilmartinez@digi.com>

meta-digi-dey/classes/dey-image-installer.bbclass

@@ -65,4 +65,12 @@ _EOF_
 	fi
 }
 
+generate_installer_zip:append:ccimx8m () {
+	INSTALLER_FILELIST=${META_DIGI_SCRIPTS}/install_usb_driver.sh
+}
+
+generate_installer_zip:append:ccmp1 () {
+	INSTALLER_FILELIST=${META_DIGI_SCRIPTS}/install_usb_driver.sh
+}
+
 IMAGE_POSTPROCESS_COMMAND += "generate_installer_zip; "

meta-digi-dey/conf/layer.conf

@@ -25,6 +25,8 @@ LAYERDEPENDS_digi-dey += "openembedded-layer networking-layer webserver qt5-laye
 
 LAYERSERIES_COMPAT_digi-dey = "kirkstone"
 
+META_DIGI_SCRIPTS = "${LAYERDIR}/../scripts"
+
 # Digi's General and Open Source license agreements
 DIGI_EULA_FILE = "${LAYERDIR}/DIGI_EULA"
 DIGI_OPEN_EULA_FILE = "${LAYERDIR}/DIGI_OPEN_EULA"

scripts/install_usb_driver.sh

@@ -0,0 +1,73 @@
+#!/bin/sh
+#===============================================================================
+#
+#  Copyright (C) 2022 by Digi International Inc.
+#  All rights reserved.
+#
+#  This program is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU General Public License version 2 as published by
+#  the Free Software Foundation.
+#
+#
+#  Description:
+#    Script to install the driver of the usb serial console.
+#===============================================================================
+
+# Exit on any error
+set -e
+
+# Unload the selected module
+unload_module()
+{
+	if grep -qs "^${1}" /proc/modules; then
+		printf "Module ${1} loaded, unloading the module.\n"
+		rmmod "${1}"
+	fi
+}
+
+# Create rule for the Cypress USB driver
+create_rule()
+{
+	RULE_PATH=/etc/udev/rules.d/90-cyusb.rules
+	if [ ! -f "$RULE_PATH" ]; then
+		printf "Rule \"$RULE_PATH\" doesn't exist, creating a new one.\n"
+		printf "# Cypress USB driver for FX2 and FX3 (C) Cypress Semiconductor Corporation / ATR-LABS" | tee ${RULE_PATH} > /dev/null
+		printf "# Rules written by V. Radhakrishnan ( rk@atr-labs.com )" | tee -a ${RULE_PATH}  > /dev/null
+		printf "# Cypress USB vendor ID = 0x04b4" | tee -a ${RULE_PATH}  > /dev/null
+		printf "KERNEL==\"*\", SUBSYSTEM==\"usb\", ENV{DEVTYPE}==\"usb_device\", ACTION==\"add\", ATTR{idVendor}==\"04b4\", MODE=\"666\"" | tee -a ${RULE_PATH}  > /dev/null
+		printf "KERNEL==\"*\", SUBSYSTEM==\"usb\", ENV{DEVTYPE}==\"usb_device\", ACTION==\"remove\", TAG==\"cyusb_dev\"" | tee -a ${RULE_PATH}  > /dev/null
+	fi
+}
+
+# Blacklist the selected module
+blacklist()
+{
+	BLACKLISTH_PATH=/etc/modprobe.d/blacklist.conf
+	if [ ! -f "$BLACKLISTH_PATH" ]; then
+		printf "File \"$BLACKLISTH_PATH\" doesn't exist, creating a new one.\n"
+		printf "blacklist ${1}" | tee ${BLACKLISTH_PATH} > /dev/null
+	else
+		printf "File \"$BLACKLISTH_PATH\" exists, checking if the rule is already there.\n"
+		if grep -Fq "${1}" $BLACKLISTH_PATH; then
+			printf "Rule for ${1} found.\n"
+		else
+			printf "Rule for ${1} not found. Adding ${1} to the blacklist.\n"
+			printf "\nblacklist ${1}" | tee -a ${BLACKLISTH_PATH} > /dev/null
+		fi
+	fi
+}
+
+if [ "$(id -u)" != 0 ]; then
+	printf "This script should be run with root privileges.\n"
+	exit 1
+fi
+
+printf "Installing Cypress USB driver.\n"
+
+create_rule
+blacklist "cytherm"
+
+unload_module "cytherm"
+unload_module "cdc_acm"
+
+printf "Please plug/unplug your usb device to be recognized.\n"