From aa35c7c148aa9b458edae02092aaf222de07f8d3 Mon Sep 17 00:00:00 2001
From: Imran Navruzbekov <imran.n@samsung.com>
Date: Fri, 18 Jan 2013 17:38:19 +0400
Subject: [PATCH] Major device number automatic detection

Delete variable target_device_major from .conf file.
Fixed situation when not display correctly demangled function names.
---
 driver/Makefile.am     |  4 +---
 driver/device_driver.c | 19 +++++++------------
 driver/swap_driver.sh  | 24 ++++++++++--------------
 3 files changed, 18 insertions(+), 29 deletions(-)

diff --git a/driver/Makefile.am b/driver/Makefile.am
index 303cc68..bb1b87f 100644
--- a/driver/Makefile.am
+++ b/driver/Makefile.am
@@ -10,7 +10,6 @@ if ANDROID
 android_opt = -D__ANDROID
 android = yes
 else
-dev_major = @TARGET_DEVICE_MAJOR@
 dev_path = @TARGET_DEVICE_PATH@
 endif
 
@@ -50,8 +49,7 @@ install-exec-local:
 	install -m 755 $(driver_module_dir)/insmod.sh $(prefix)/bin
 
 	if [ "$(android)" != "yes" ] ; then \
-	sed "s|__DEV_MAJOR__|$(dev_major)|" $(driver_module_dir)/$(module_name).sh | \
-	sed "s|__DEV_NAME__|`basename $(dev_path)`|" | \
+	sed "s|__DEV_NAME__|`basename $(dev_path)`|" $(driver_module_dir)/$(module_name).sh | \
 	sed "s|__DEV_DIR__|`dirname $(dev_path)`|" > \
 	$(prefix)/$(module_name).sh ; chmod +x $(prefix)/$(module_name).sh ; \
 	chmod +x $(driver_module_dir)/patchko.sh ; \
diff --git a/driver/device_driver.c b/driver/device_driver.c
index 2cbd4b0..c497286 100644
--- a/driver/device_driver.c
+++ b/driver/device_driver.c
@@ -65,20 +65,15 @@ typedef void (* dbi_module_callback)();
 int device_init (void)
 {
 	int nReserved = 0;
-	int nRetVal = register_chrdev(device_major, device_name, &device_fops);
-	if (nRetVal < 0) {
-		EPRINTF("Cannot register character device! [%s, %d]", device_name, device_major);
-		nReserved = register_chrdev(0, device_name, &device_fops);
-		if(nReserved >= 0)
-		{
-			unregister_chrdev(nReserved, device_name);
-			EPRINTF("Please, create a new device node with major number [%d],\n\tand pass it as module parameter!", nReserved);
-		}
+	nReserved = register_chrdev(0, device_name, &device_fops);
+	if(nReserved < 0)
+	{
+		unregister_chrdev(nReserved, device_name);
+		EPRINTF("Cannot register character device!");
 		return -1;
-	} else if(nRetVal > 0) {
-		EPRINTF("Cannot register this device major number! [%d]\n\tTrying a new one. [%d]", device_major, nRetVal);
-		device_major = nRetVal;
 	}
+	EPRINTF("New device node with major number [%d], was created\n", nReserved);
+	device_major = nReserved;
 	return 0;
 }
 
diff --git a/driver/swap_driver.sh b/driver/swap_driver.sh
index 4993ff7..720b8a5 100755
--- a/driver/swap_driver.sh
+++ b/driver/swap_driver.sh
@@ -6,7 +6,6 @@ MODULE_FILE=swap_driver
 
 # device name
 DEVICE=__DEV_NAME__
-DEVICE_MAJOR=__DEV_MAJOR__
 
 # name of device visible in /proc/devices
 DEVICE_NAME=${DEVICE}
@@ -42,6 +41,16 @@ if [ "${MAJOR}" != "" ] ; then
     fi
 fi
 
+# load driver module
+echo "loading module '${MODULE_FILE}'"
+./bin/insmod.sh ${MODULE_FILE}.ko device_name=${DEVICE_NAME}
+if [ $? -ne 0 ]; then
+    echo "Error: Unable to load Swap Driver!"
+    exit 1
+fi
+
+MAJOR=`sed "/${DEVICE_NAME}/ ! d" /proc/devices | sed "s/ ${DEVICE_NAME}//"`
+DEVICE_MAJOR=${MAJOR}
 if [ ! -c ${DEVICE_FILE} ] ; then
 	echo "WARNING: Creating device node with major number [${DEVICE_MAJOR}]!"
 	mknod ${DEVICE_FILE} c ${DEVICE_MAJOR} 0
@@ -50,17 +59,4 @@ if [ ! -c ${DEVICE_FILE} ] ; then
 	    exit 1
 	fi
 	chmod a+r ${DEVICE_FILE}
-else
-	# stat is better, but DTV doesn't have stat
-	DEVICE_MAJOR=`ls -l ${DEVICE_FILE} | awk '{sub(/,/,"",$5); print $5}'`
 fi
-
-# load driver module
-echo "loading module '${MODULE_FILE}'"
-./bin/insmod.sh ${MODULE_FILE}.ko device_name=${DEVICE_NAME} device_major=${DEVICE_MAJOR}
-if [ $? -ne 0 ]; then
-    echo "Error: Unable to load Swap Driver!"
-    exit 1
-fi
-MAJOR=`sed "/${DEVICE_NAME}/ ! d" /proc/devices | sed "s/ ${DEVICE_NAME}//"`
-
-- 
2.7.4