1 files changed, 63 insertions, 0 deletions
diff --git a/drivers/misc/suspend_counter.c b/drivers/misc/suspend_counter.c
new file mode 100644
index 000000000000..4aec4ab37c8c
--- /dev/null
+++ b/drivers/misc/suspend_counter.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2012 Freescale Semiconductor, 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 as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/suspend.h>
+#include <linux/delay.h>
+
+
+static int suspend_counter;
+static ktime_t suspend_time;
+static ktime_t tmp_time;
+
+static int suspend_counter_notifier(struct notifier_block *nb,
+				   unsigned long event, void *dummy)
+{
+	struct timespec tv;
+	switch (event) {
+	case PM_SUSPEND_PREPARE:
+		suspend_counter++;
+		suspend_time = ktime_get_real();
+		printk(KERN_INFO "suspend: start %d suspend...\n",
+		       suspend_counter);
+	case PM_POST_SUSPEND:
+		tmp_time = ktime_sub(ktime_get_real(), suspend_time);
+		tv = ktime_to_timespec(tmp_time);
+		printk(KERN_INFO "suspend: finish %d suspend "
+		       "after:%lu.%03lu seconds...\n",
+		       suspend_counter,
+		       (unsigned long) tv.tv_sec,
+		       (unsigned long) tv.tv_nsec);
+	default:
+		break;
+	}
+	return 0;
+}
+
+static struct notifier_block suspend_counter_notifier_block = {
+	.notifier_call = suspend_counter_notifier,
+};
+
+static int __init suspend_counter_init(void)
+{
+	return register_pm_notifier(&suspend_counter_notifier_block);
+}
+
+device_initcall(suspend_counter_init);