Added missing tegra files.HEADmaster

1 files changed, 111 insertions, 0 deletions

diff --git a/kernel/power/suspend_time.c b/kernel/power/suspend_time.c
new file mode 100644
index 00000000000..d2a65da9f22
--- /dev/null
+++ b/kernel/power/suspend_time.c
@@ -0,0 +1,111 @@
+/*
+ * debugfs file to track time spent in suspend
+ *
+ * Copyright (c) 2011, Google, Inc.
+ *
+ * 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.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/seq_file.h>
+#include <linux/syscore_ops.h>
+#include <linux/time.h>
+
+static struct timespec suspend_time_before;
+static unsigned int time_in_suspend_bins[32];
+
+#ifdef CONFIG_DEBUG_FS
+static int suspend_time_debug_show(struct seq_file *s, void *data)
+{
+        int bin;
+        seq_printf(s, "time (secs)  count\n");
+        seq_printf(s, "------------------\n");
+        for (bin = 0; bin < 32; bin++) {
+                if (time_in_suspend_bins[bin] == 0)
+                        continue;
+                seq_printf(s, "%4d - %4d %4u\n",
+                        bin ? 1 << (bin - 1) : 0, 1 << bin,
+                                time_in_suspend_bins[bin]);
+        }
+        return 0;
+}
+
+static int suspend_time_debug_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, suspend_time_debug_show, NULL);
+}
+
+static const struct file_operations suspend_time_debug_fops = {
+        .open           = suspend_time_debug_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int __init suspend_time_debug_init(void)
+{
+        struct dentry *d;
+
+        d = debugfs_create_file("suspend_time", 0755, NULL, NULL,
+                &suspend_time_debug_fops);
+        if (!d) {
+                pr_err("Failed to create suspend_time debug file\n");
+                return -ENOMEM;
+        }
+
+        return 0;
+}
+
+late_initcall(suspend_time_debug_init);
+#endif
+
+static int suspend_time_syscore_suspend(void)
+{
+        read_persistent_clock(&suspend_time_before);
+
+        return 0;
+}
+
+static void suspend_time_syscore_resume(void)
+{
+        struct timespec after;
+
+        read_persistent_clock(&after);
+
+        after = timespec_sub(after, suspend_time_before);
+
+        time_in_suspend_bins[fls(after.tv_sec)]++;
+
+        pr_info("Suspended for %lu.%03lu seconds\n", after.tv_sec,
+                after.tv_nsec / NSEC_PER_MSEC);
+}
+
+static struct syscore_ops suspend_time_syscore_ops = {
+        .suspend = suspend_time_syscore_suspend,
+        .resume = suspend_time_syscore_resume,
+};
+
+static int suspend_time_syscore_init(void)
+{
+        register_syscore_ops(&suspend_time_syscore_ops);
+
+        return 0;
+}
+
+static void suspend_time_syscore_exit(void)
+{
+        unregister_syscore_ops(&suspend_time_syscore_ops);
+}
+module_init(suspend_time_syscore_init);
+module_exit(suspend_time_syscore_exit);