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path: root/drivers/misc/suspend_counter.c
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Diffstat (limited to 'drivers/misc/suspend_counter.c')
-rw-r--r--drivers/misc/suspend_counter.c63
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);