Revert "power: wakeup_reason: send uevent to user space"

This reverts commit ba2d60830c.

Change-Id: Ib4909673a306eb1f2d7a70a07cd9dc5189e7c03e
Signed-off-by: xianzhu <xianzhu@codeaurora.org>

kernel/power/wakeup_reason.c

@@ -3,14 +3,8 @@
  *
  * Logs the reasons which caused the kernel to resume from
  * the suspend mode.
- * Sends uevent to user space when enter or out of suspend,
- * the modules of user space can use it to do some necessary
- * operation. for example, sending a special signal to modem
- * or controling the brightness of a lamp before or after suspend.
  *
  * Copyright (C) 2014 Google, Inc.
- * Copyright (c) 2018, The Linux Foundation. All rights reserved.
- *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
@@ -32,8 +26,7 @@
 #include <linux/spinlock.h>
 #include <linux/notifier.h>
 #include <linux/suspend.h>
-#include <linux/kobject.h>
+
-#include <linux/suspend.h>
 
 #define MAX_WAKEUP_REASON_IRQS 32
 static int irq_list[MAX_WAKEUP_REASON_IRQS];
@@ -48,9 +41,6 @@ static ktime_t curr_monotime; /* monotonic time after last suspend */
 static ktime_t last_stime; /* monotonic boottime offset before last suspend */
 static ktime_t curr_stime; /* monotonic boottime offset after last suspend */
 
-static struct class *wake_uevent_class;
-static struct device *wake_uevent_device;
-
 static ssize_t last_resume_reason_show(struct kobject *kobj, struct kobj_attribute *attr,
 		char *buf)
 {
@@ -178,22 +168,12 @@ void log_suspend_abort_reason(const char *fmt, ...)
 static int wakeup_reason_pm_event(struct notifier_block *notifier,
 		unsigned long pm_event, void *unused)
 {
-	int ret = 0;
-	static char envp[32] = {0};
-	static const char * const evp[] = {envp, NULL};
-
 	switch (pm_event) {
 	case PM_SUSPEND_PREPARE:
 		spin_lock(&resume_reason_lock);
 		irqcount = 0;
 		suspend_abort = false;
 		spin_unlock(&resume_reason_lock);
-		/* send the uevent to userspace */
-		snprintf(envp, 32, "STATE=%s", "suspend start");
-		ret = kobject_uevent_env(&wake_uevent_device->kobj,
-				KOBJ_CHANGE, (char **)evp);
-		if (ret)
-			pr_warn("Send uevent failed");
 		/* monotonic time since boot */
 		last_monotime = ktime_get();
 		/* monotonic time since boot including the time spent in suspend */
@@ -204,12 +184,6 @@ static int wakeup_reason_pm_event(struct notifier_block *notifier,
 		curr_monotime = ktime_get();
 		/* monotonic time since boot including the time spent in suspend */
 		curr_stime = ktime_get_boottime();
-		/* send the uevent to userspace */
-		snprintf(envp, 32, "STATE=%s", "resume complete");
-		ret = kobject_uevent_env(&wake_uevent_device->kobj,
-				KOBJ_CHANGE, (char **)evp);
-		if (ret)
-			pr_warn("Send uevent failed");
 		break;
 	default:
 		break;
@@ -221,18 +195,12 @@ static struct notifier_block wakeup_reason_pm_notifier_block = {
 	.notifier_call = wakeup_reason_pm_event,
 };
 
-static const struct file_operations wakeup_uevent = {
-	.owner  = THIS_MODULE,
-};
-
 /* Initializes the sysfs parameter
  * registers the pm_event notifier
- * register the wake_uevent device
  */
 int __init wakeup_reason_init(void)
 {
 	int retval;
-	int major;
 
 	retval = register_pm_notifier(&wakeup_reason_pm_notifier_block);
 	if (retval)
@@ -250,36 +218,8 @@ int __init wakeup_reason_init(void)
 		kobject_put(wakeup_reason);
 		printk(KERN_WARNING "[%s] failed to create a sysfs group %d\n",
 				__func__, retval);
-		return retval;
 	}
-	major = register_chrdev(0, "wake_uevent", &wakeup_uevent);
-	if (major < 0) {
-		sysfs_remove_group(wakeup_reason, &attr_group);
-		kobject_put(wakeup_reason);
-		return major;
-	}
-	wake_uevent_class = class_create(THIS_MODULE, "wake_uevent");
-	if (IS_ERR(wake_uevent_class)) {
-		retval = PTR_ERR(wake_uevent_class);
-		goto fail_class;
-	}
-	wake_uevent_device = device_create(wake_uevent_class, NULL,
-				MKDEV(major, 0),
-				NULL, "wake_uevent");
-	if (IS_ERR(wake_uevent_device)) {
-		retval = PTR_ERR(wake_uevent_device);
-		goto fail_device;
-	}
-
 	return 0;
-
-fail_device:
-	class_destroy(wake_uevent_class);
-fail_class:
-	unregister_chrdev(major, "wake_uevent");
-	sysfs_remove_group(wakeup_reason, &attr_group);
-	kobject_put(wakeup_reason);
-	return retval;
 }
 
 late_initcall(wakeup_reason_init);