selftest: cpufreq: Add suspend/resume/hibernate support

This patch adds support to test basic suspend/resume and hibernation to
the cpufreq selftests.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/cpufreq/cpufreq.sh

@@ -199,3 +199,43 @@ cpufreq_basic_tests()
 	# Test all governors
 	shuffle_governors_for_all_cpus 1
 }
+
+# Suspend/resume
+# $1: "suspend" or "hibernate", $2: loop count
+do_suspend()
+{
+	printf "** Test: Running ${FUNCNAME[0]}: Trying $1 for $2 loops **\n\n"
+
+	# Is the directory available
+	if [ ! -d $SYSFS/power/ -o ! -f $SYSFS/power/state ]; then
+		printf "$SYSFS/power/state not available\n"
+		return 1
+	fi
+
+	if [ $1 = "suspend" ]; then
+		filename="mem"
+	elif [ $1 = "hibernate" ]; then
+		filename="disk"
+	else
+		printf "$1 is not a valid option\n"
+		return 1
+	fi
+
+	if [ -n $filename ]; then
+		present=$(cat $SYSFS/power/state | grep $filename)
+
+		if [ -z "$present" ]; then
+			printf "Tried to $1 but $filename isn't present in $SYSFS/power/state\n"
+			return 1;
+		fi
+
+		for i in `seq 1 $2`; do
+			printf "Starting $1\n"
+			echo $filename > $SYSFS/power/state
+			printf "Came out of $1\n"
+
+			printf "Do basic tests after finishing $1 to verify cpufreq state\n\n"
+			cpufreq_basic_tests
+		done
+	fi
+}

tools/testing/selftests/cpufreq/main.sh

@@ -15,7 +15,9 @@ helpme()
 	printf "Usage: $0 [-h] [-to args]
 	[-h <help>]
 	[-o <output-file-for-dump>]
-	[-t <basic: Basic cpufreq testing>]
+	[-t <basic: Basic cpufreq testing
+	     suspend: suspend/resume,
+	     hibernate: hibernate/resume>]
 	\n"
 	exit 2
 }
@@ -61,7 +63,7 @@ parse_arguments()
 				helpme
 				;;
 
-			t) # --func_type (Function to perform: basic (default: basic))
+			t) # --func_type (Function to perform: basic, suspend, hibernate (default: basic))
 				FUNC=$OPTARG
 				;;
 
@@ -91,6 +93,14 @@ do_test()
 		cpufreq_basic_tests
 		;;
 
+		"suspend")
+		do_suspend "suspend" 1
+		;;
+
+		"hibernate")
+		do_suspend "hibernate" 1
+		;;
+
 		*)
 		echo "Invalid [-f] function type"
 		helpme