Loading kernel/power/wakeup_reason.c +61 −1 Original line number Diff line number Diff line Loading @@ -3,8 +3,14 @@ * * 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. Loading @@ -26,7 +32,8 @@ #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]; Loading @@ -41,6 +48,9 @@ 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) { Loading Loading @@ -168,12 +178,22 @@ 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 */ Loading @@ -184,6 +204,12 @@ 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; Loading @@ -195,12 +221,18 @@ 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) Loading @@ -218,8 +250,36 @@ 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); Loading
kernel/power/wakeup_reason.c +61 −1 Original line number Diff line number Diff line Loading @@ -3,8 +3,14 @@ * * 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. Loading @@ -26,7 +32,8 @@ #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]; Loading @@ -41,6 +48,9 @@ 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) { Loading Loading @@ -168,12 +178,22 @@ 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 */ Loading @@ -184,6 +204,12 @@ 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; Loading @@ -195,12 +221,18 @@ 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) Loading @@ -218,8 +250,36 @@ 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);
