ANDROID: power: wakeup_reason: add an API to log wakeup reasons
Add API log_wakeup_reason() and expose it to userspace via sysfs path /sys/kernel/wakeup_reasons/last_resume_reason Change-Id: I81addaf420f1338255c5d0638b0d244a99d777d1 Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com> [AmitP: Folded following android-4.9 commit changes into this patch 1135122a192a ("ANDROID: POWER: fix compile warnings in log_wakeup_reason") b4e6247778b0 ("ANDROID: Power: Changes the permission to read only for sysfs file /sys/kernel/wakeup_reasons/last_resume_reason") e13dbc7c69cd ("ANDROID: power: wakeup_reason: rename irq_count to irqcount")] Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
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23
include/linux/wakeup_reason.h
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23
include/linux/wakeup_reason.h
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/*
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* include/linux/wakeup_reason.h
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*
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* Logs the reason which caused the kernel to resume
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* from the suspend mode.
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*
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* Copyright (C) 2014 Google, Inc.
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _LINUX_WAKEUP_REASON_H
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#define _LINUX_WAKEUP_REASON_H
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void log_wakeup_reason(int irq);
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#endif /* _LINUX_WAKEUP_REASON_H */
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@ -15,3 +15,5 @@ obj-$(CONFIG_PM_AUTOSLEEP) += autosleep.o
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obj-$(CONFIG_PM_WAKELOCKS) += wakelock.o
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obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
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obj-$(CONFIG_SUSPEND) += wakeup_reason.o
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132
kernel/power/wakeup_reason.c
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kernel/power/wakeup_reason.c
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/*
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* kernel/power/wakeup_reason.c
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*
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* Logs the reasons which caused the kernel to resume from
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* the suspend mode.
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*
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* Copyright (C) 2014 Google, Inc.
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/wakeup_reason.h>
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#include <linux/kernel.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/notifier.h>
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#include <linux/suspend.h>
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#define MAX_WAKEUP_REASON_IRQS 32
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static int irq_list[MAX_WAKEUP_REASON_IRQS];
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static int irqcount;
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static struct kobject *wakeup_reason;
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static spinlock_t resume_reason_lock;
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static ssize_t last_resume_reason_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *buf)
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{
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int irq_no, buf_offset = 0;
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struct irq_desc *desc;
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spin_lock(&resume_reason_lock);
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for (irq_no = 0; irq_no < irqcount; irq_no++) {
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desc = irq_to_desc(irq_list[irq_no]);
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if (desc && desc->action && desc->action->name)
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buf_offset += sprintf(buf + buf_offset, "%d %s\n",
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irq_list[irq_no], desc->action->name);
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else
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buf_offset += sprintf(buf + buf_offset, "%d\n",
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irq_list[irq_no]);
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}
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spin_unlock(&resume_reason_lock);
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return buf_offset;
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}
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static struct kobj_attribute resume_reason = __ATTR_RO(last_resume_reason);
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static struct attribute *attrs[] = {
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&resume_reason.attr,
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NULL,
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};
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static struct attribute_group attr_group = {
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.attrs = attrs,
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};
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/*
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* logs all the wake up reasons to the kernel
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* stores the irqs to expose them to the userspace via sysfs
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*/
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void log_wakeup_reason(int irq)
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{
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struct irq_desc *desc;
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desc = irq_to_desc(irq);
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if (desc && desc->action && desc->action->name)
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printk(KERN_INFO "Resume caused by IRQ %d, %s\n", irq,
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desc->action->name);
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else
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printk(KERN_INFO "Resume caused by IRQ %d\n", irq);
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spin_lock(&resume_reason_lock);
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irq_list[irqcount++] = irq;
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spin_unlock(&resume_reason_lock);
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}
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/* Detects a suspend and clears all the previous wake up reasons*/
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static int wakeup_reason_pm_event(struct notifier_block *notifier,
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unsigned long pm_event, void *unused)
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{
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switch (pm_event) {
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case PM_SUSPEND_PREPARE:
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spin_lock(&resume_reason_lock);
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irqcount = 0;
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spin_unlock(&resume_reason_lock);
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break;
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default:
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break;
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block wakeup_reason_pm_notifier_block = {
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.notifier_call = wakeup_reason_pm_event,
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};
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/* Initializes the sysfs parameter
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* registers the pm_event notifier
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*/
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int __init wakeup_reason_init(void)
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{
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int retval;
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spin_lock_init(&resume_reason_lock);
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retval = register_pm_notifier(&wakeup_reason_pm_notifier_block);
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if (retval)
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printk(KERN_WARNING "[%s] failed to register PM notifier %d\n",
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__func__, retval);
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wakeup_reason = kobject_create_and_add("wakeup_reasons", kernel_kobj);
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if (!wakeup_reason) {
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printk(KERN_WARNING "[%s] failed to create a sysfs kobject\n",
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__func__);
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return 1;
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}
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retval = sysfs_create_group(wakeup_reason, &attr_group);
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if (retval) {
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kobject_put(wakeup_reason);
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printk(KERN_WARNING "[%s] failed to create a sysfs group %d\n",
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__func__, retval);
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}
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return 0;
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}
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late_initcall(wakeup_reason_init);
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