Update LIN demo to use lin-config

Changes include:
- Add patch to fix lin-config recipe build QA error.
- Tweak lin-config recipe to install lin_config as executable.
- Rework sllin-demo systemd unit and start_lin_demo.sh script to use
  lin_config with an appropriate configuration file that enables
  polling of the steering wheel adapter instead of just using
  ldattach.

Bug-AGL: SPEC-2918

Change-Id: I3258b7e34cecbbb1cfb93ea6f63a44f0bbb2c06f
Signed-off-by: Scott Murray <scott.murray@konsulko.com>

4 files changed, 24 insertions, 6 deletions

diff --git a/recipes-kernel/sllin/files/lin_config.conf b/recipes-kernel/sllin/files/lin_config.conf
new file mode 100644
index 000000000..9775b8b39
--- /dev/null
+++ b/recipes-kernel/sllin/files/lin_config.conf
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--PCAN-LIN CT profile.-->
+<PCLIN_PROFILE Version="1">
+	<LIN Group="2">
+		<Scheduler_Entries Count="1">
+			<!-- Poll steering wheel adapter at address 0x21 every 100 ms -->
+			<Entry Time="100">33</Entry>
+		</Scheduler_Entries>
+	</LIN>
+</PCLIN_PROFILE>
diff --git a/recipes-kernel/sllin/files/sllin-demo.service b/recipes-kernel/sllin/files/sllin-demo.service
index 7eb6cfac4..2f2f5ac23 100644
--- a/recipes-kernel/sllin/files/sllin-demo.service
+++ b/recipes-kernel/sllin/files/sllin-demo.service
@@ -1,13 +1,13 @@
 [Unit]
-Description = LIN DEMO startup
+Description=LIN demo configuration
+ConditionPathExists=/dev/ttyUSB0
 After=afm-system-daemon.service
  
 [Service]
 Type=forking
-PIDFile=/var/run/lin_ldattach
+PIDFile=/var/run/lin_config.pid
 ExecStart=/usr/bin/start_lin_demo.sh
 RemainAfterExit=yes
-
  
 [Install]
 WantedBy=multi-user.target
diff --git a/recipes-kernel/sllin/files/start_lin_demo.sh b/recipes-kernel/sllin/files/start_lin_demo.sh
index 741189fb7..4fcfcc6d2 100755..100644
--- a/recipes-kernel/sllin/files/start_lin_demo.sh
+++ b/recipes-kernel/sllin/files/start_lin_demo.sh
@@ -1,10 +1,13 @@
 #!/bin/sh
 
+# Attach serial LIN->CAN bridge and set up LIN polling
 sleep 1
-ldattach 25 /dev/ttySC3
-pidof ldattach > /var/run/lin_ldattach
+/usr/bin/lin_config -c /etc/lin_config.conf -a sllin:/dev/ttyUSB0
+pidof lin_config > /var/run/lin_config.pid
 sleep 1
 ip link set sllin0 up
+
+# Initialize HVAC controller
 usleep 100000
 cansend sllin0 030#
 usleep 100000
diff --git a/recipes-kernel/sllin/sllin.bb b/recipes-kernel/sllin/sllin.bb
index 6213fd967..0478b21a7 100644
--- a/recipes-kernel/sllin/sllin.bb
+++ b/recipes-kernel/sllin/sllin.bb
@@ -19,6 +19,7 @@ SRC_URI_append = " \
 	file://0001-Disable-sllin-driver-debug-log.patch;pnum=2 \
 	file://sllin-demo.service \
 	file://start_lin_demo.sh \
+	file://lin_config.conf \
 "
 
 KERNEL_MODULE_AUTOLOAD_append = " sllin"
@@ -34,6 +35,10 @@ do_install_append () {
 	install -m 755 ${WORKDIR}/start_lin_demo.sh ${D}/${bindir}/start_lin_demo.sh
 	install -d ${D}${systemd_system_unitdir}
 	install -m 0644 ${WORKDIR}/sllin-demo.service ${D}${systemd_system_unitdir}/
+	install -d ${D}${sysconfdir}
+	install -m 0644 ${WORKDIR}/lin_config.conf ${D}${sysconfdir}/
 }
 
-FILES_${PN}_append = " ${bindir}/start_lin_demo.sh"
+FILES_${PN} += "${bindir}/start_lin_demo.sh ${sysconfdir}/lin_config.conf"
+
+RDEPENDS_${PN} += "lin-config"