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>

6 files changed, 47 insertions, 11 deletions

diff --git a/recipes-kernel/sllin/files/lin_config.conf b/recipes-kernel/sllin/files/lin_config.conf
new file mode 100644
index 00000000..9775b8b3
--- /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 7eb6cfac..2f2f5ac2 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 741189fb..4fcfcc6d 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 6213fd96..0478b21a 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"
diff --git a/recipes-support/lin-config/files/0002-Change-Makefile-to-use-LDFLAGS.patch b/recipes-support/lin-config/files/0002-Change-Makefile-to-use-LDFLAGS.patch
new file mode 100644
index 00000000..26364455
--- /dev/null
+++ b/recipes-support/lin-config/files/0002-Change-Makefile-to-use-LDFLAGS.patch
@@ -0,0 +1,20 @@
+Use LDFLAGS when linking
+
+Use LDFLAGS when linking the output binary to quiet QA warnings due to
+missing link flags.
+
+Upstream-Status: Pending
+
+Signed-off-by: Scott Murray <scott.murray@konsulko.com>
+
+--- a/Makefile	2019-11-05 11:08:11.060565285 +0000
++++ b/Makefile	2019-11-05 11:09:38.663570084 +0000
+@@ -6,7 +6,7 @@
+ objects = linc_parse_xml.o pcl_config.o sllin_config.o lin_config.o
+ 
+ lin_config: $(objects)
+-	$(CC) $(objects) $(LIBS) -o lin_config
++	$(CC) $(LDFLAGS) $(objects) $(LIBS) -o lin_config
+ 
+ %.o : %.c %.h
+ 	$(CC) $(CFLAGS) $(LIBS) -c $< -o $@
diff --git a/recipes-support/lin-config/lin-config_git.bb b/recipes-support/lin-config/lin-config_git.bb
index 6c8db847..e83f7160 100644
--- a/recipes-support/lin-config/lin-config_git.bb
+++ b/recipes-support/lin-config/lin-config_git.bb
@@ -2,7 +2,6 @@ DESCRIPTION = "lin-config tool for the sllin driver module"
 LICENSE = "GPLv2"
 LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/GPL-2.0;md5=801f80980d171dd6425610833a22dbe6"
 
-
 DEPENDS += "libnl libxml2"
 
 SRC_URI = "git://github.com/trainman419/linux-lin.git;protocol=https"
@@ -11,17 +10,16 @@ S = "${WORKDIR}/git/lin_config/src"
 
 SRC_URI_append = " \
 	file://0001-Change-Makefile-to-use-pkg-config-for-libxml-2.0.patch \
+	file://0002-Change-Makefile-to-use-LDFLAGS.patch \
 	"
 
 inherit pkgconfig
 
 PV = "0.1+git${SRCPV}"
 
-
 do_configure[noexec] = "1"
 
 do_install_append() {
-
     install -d ${D}/${bindir}
-    install -m 644 ${S}/lin_config ${D}/${bindir}
-}
\ No newline at end of file
+    install -m 755 ${S}/lin_config ${D}/${bindir}
+}