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1187 lines
31 KiB
1187 lines
31 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* drivers/base/power/wakeup.c - System wakeup events framework |
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* |
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* Copyright (c) 2010 Rafael J. Wysocki <[email protected]>, Novell Inc. |
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*/ |
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#define pr_fmt(fmt) "PM: " fmt |
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|
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#include <linux/device.h> |
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#include <linux/slab.h> |
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#include <linux/sched/signal.h> |
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#include <linux/capability.h> |
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#include <linux/export.h> |
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#include <linux/suspend.h> |
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#include <linux/seq_file.h> |
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#include <linux/debugfs.h> |
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#include <linux/pm_wakeirq.h> |
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#include <trace/events/power.h> |
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#include "power.h" |
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#ifndef CONFIG_SUSPEND |
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suspend_state_t pm_suspend_target_state; |
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#define pm_suspend_target_state (PM_SUSPEND_ON) |
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#endif |
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#define list_for_each_entry_rcu_locked(pos, head, member) \ |
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list_for_each_entry_rcu(pos, head, member, \ |
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srcu_read_lock_held(&wakeup_srcu)) |
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/* |
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* If set, the suspend/hibernate code will abort transitions to a sleep state |
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* if wakeup events are registered during or immediately before the transition. |
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*/ |
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bool events_check_enabled __read_mostly; |
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/* First wakeup IRQ seen by the kernel in the last cycle. */ |
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unsigned int pm_wakeup_irq __read_mostly; |
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/* If greater than 0 and the system is suspending, terminate the suspend. */ |
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static atomic_t pm_abort_suspend __read_mostly; |
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/* |
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* Combined counters of registered wakeup events and wakeup events in progress. |
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* They need to be modified together atomically, so it's better to use one |
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* atomic variable to hold them both. |
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*/ |
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static atomic_t combined_event_count = ATOMIC_INIT(0); |
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#define IN_PROGRESS_BITS (sizeof(int) * 4) |
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#define MAX_IN_PROGRESS ((1 << IN_PROGRESS_BITS) - 1) |
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static void split_counters(unsigned int *cnt, unsigned int *inpr) |
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{ |
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unsigned int comb = atomic_read(&combined_event_count); |
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*cnt = (comb >> IN_PROGRESS_BITS); |
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*inpr = comb & MAX_IN_PROGRESS; |
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} |
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/* A preserved old value of the events counter. */ |
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static unsigned int saved_count; |
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static DEFINE_RAW_SPINLOCK(events_lock); |
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static void pm_wakeup_timer_fn(struct timer_list *t); |
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static LIST_HEAD(wakeup_sources); |
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static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue); |
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DEFINE_STATIC_SRCU(wakeup_srcu); |
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static struct wakeup_source deleted_ws = { |
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.name = "deleted", |
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.lock = __SPIN_LOCK_UNLOCKED(deleted_ws.lock), |
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}; |
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static DEFINE_IDA(wakeup_ida); |
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/** |
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* wakeup_source_create - Create a struct wakeup_source object. |
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* @name: Name of the new wakeup source. |
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*/ |
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struct wakeup_source *wakeup_source_create(const char *name) |
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{ |
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struct wakeup_source *ws; |
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const char *ws_name; |
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int id; |
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ws = kzalloc(sizeof(*ws), GFP_KERNEL); |
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if (!ws) |
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goto err_ws; |
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ws_name = kstrdup_const(name, GFP_KERNEL); |
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if (!ws_name) |
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goto err_name; |
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ws->name = ws_name; |
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id = ida_alloc(&wakeup_ida, GFP_KERNEL); |
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if (id < 0) |
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goto err_id; |
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ws->id = id; |
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return ws; |
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err_id: |
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kfree_const(ws->name); |
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err_name: |
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kfree(ws); |
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err_ws: |
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return NULL; |
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} |
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EXPORT_SYMBOL_GPL(wakeup_source_create); |
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/* |
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* Record wakeup_source statistics being deleted into a dummy wakeup_source. |
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*/ |
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static void wakeup_source_record(struct wakeup_source *ws) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&deleted_ws.lock, flags); |
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if (ws->event_count) { |
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deleted_ws.total_time = |
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ktime_add(deleted_ws.total_time, ws->total_time); |
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deleted_ws.prevent_sleep_time = |
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ktime_add(deleted_ws.prevent_sleep_time, |
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ws->prevent_sleep_time); |
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deleted_ws.max_time = |
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ktime_compare(deleted_ws.max_time, ws->max_time) > 0 ? |
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deleted_ws.max_time : ws->max_time; |
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deleted_ws.event_count += ws->event_count; |
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deleted_ws.active_count += ws->active_count; |
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deleted_ws.relax_count += ws->relax_count; |
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deleted_ws.expire_count += ws->expire_count; |
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deleted_ws.wakeup_count += ws->wakeup_count; |
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} |
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spin_unlock_irqrestore(&deleted_ws.lock, flags); |
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} |
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static void wakeup_source_free(struct wakeup_source *ws) |
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{ |
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ida_free(&wakeup_ida, ws->id); |
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kfree_const(ws->name); |
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kfree(ws); |
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} |
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/** |
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* wakeup_source_destroy - Destroy a struct wakeup_source object. |
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* @ws: Wakeup source to destroy. |
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* |
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* Use only for wakeup source objects created with wakeup_source_create(). |
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*/ |
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void wakeup_source_destroy(struct wakeup_source *ws) |
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{ |
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if (!ws) |
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return; |
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__pm_relax(ws); |
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wakeup_source_record(ws); |
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wakeup_source_free(ws); |
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} |
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EXPORT_SYMBOL_GPL(wakeup_source_destroy); |
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/** |
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* wakeup_source_add - Add given object to the list of wakeup sources. |
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* @ws: Wakeup source object to add to the list. |
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*/ |
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void wakeup_source_add(struct wakeup_source *ws) |
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{ |
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unsigned long flags; |
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if (WARN_ON(!ws)) |
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return; |
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spin_lock_init(&ws->lock); |
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timer_setup(&ws->timer, pm_wakeup_timer_fn, 0); |
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ws->active = false; |
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raw_spin_lock_irqsave(&events_lock, flags); |
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list_add_rcu(&ws->entry, &wakeup_sources); |
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raw_spin_unlock_irqrestore(&events_lock, flags); |
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} |
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EXPORT_SYMBOL_GPL(wakeup_source_add); |
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/** |
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* wakeup_source_remove - Remove given object from the wakeup sources list. |
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* @ws: Wakeup source object to remove from the list. |
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*/ |
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void wakeup_source_remove(struct wakeup_source *ws) |
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{ |
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unsigned long flags; |
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if (WARN_ON(!ws)) |
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return; |
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raw_spin_lock_irqsave(&events_lock, flags); |
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list_del_rcu(&ws->entry); |
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raw_spin_unlock_irqrestore(&events_lock, flags); |
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synchronize_srcu(&wakeup_srcu); |
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del_timer_sync(&ws->timer); |
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/* |
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* Clear timer.function to make wakeup_source_not_registered() treat |
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* this wakeup source as not registered. |
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*/ |
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ws->timer.function = NULL; |
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} |
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EXPORT_SYMBOL_GPL(wakeup_source_remove); |
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/** |
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* wakeup_source_register - Create wakeup source and add it to the list. |
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* @dev: Device this wakeup source is associated with (or NULL if virtual). |
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* @name: Name of the wakeup source to register. |
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*/ |
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struct wakeup_source *wakeup_source_register(struct device *dev, |
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const char *name) |
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{ |
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struct wakeup_source *ws; |
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int ret; |
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ws = wakeup_source_create(name); |
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if (ws) { |
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if (!dev || device_is_registered(dev)) { |
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ret = wakeup_source_sysfs_add(dev, ws); |
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if (ret) { |
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wakeup_source_free(ws); |
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return NULL; |
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} |
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} |
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wakeup_source_add(ws); |
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} |
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return ws; |
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} |
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EXPORT_SYMBOL_GPL(wakeup_source_register); |
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/** |
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* wakeup_source_unregister - Remove wakeup source from the list and remove it. |
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* @ws: Wakeup source object to unregister. |
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*/ |
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void wakeup_source_unregister(struct wakeup_source *ws) |
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{ |
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if (ws) { |
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wakeup_source_remove(ws); |
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if (ws->dev) |
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wakeup_source_sysfs_remove(ws); |
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wakeup_source_destroy(ws); |
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} |
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} |
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EXPORT_SYMBOL_GPL(wakeup_source_unregister); |
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/** |
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* wakeup_sources_read_lock - Lock wakeup source list for read. |
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* |
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* Returns an index of srcu lock for struct wakeup_srcu. |
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* This index must be passed to the matching wakeup_sources_read_unlock(). |
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*/ |
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int wakeup_sources_read_lock(void) |
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{ |
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return srcu_read_lock(&wakeup_srcu); |
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} |
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EXPORT_SYMBOL_GPL(wakeup_sources_read_lock); |
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/** |
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* wakeup_sources_read_unlock - Unlock wakeup source list. |
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* @idx: return value from corresponding wakeup_sources_read_lock() |
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*/ |
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void wakeup_sources_read_unlock(int idx) |
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{ |
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srcu_read_unlock(&wakeup_srcu, idx); |
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} |
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EXPORT_SYMBOL_GPL(wakeup_sources_read_unlock); |
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/** |
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* wakeup_sources_walk_start - Begin a walk on wakeup source list |
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* |
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* Returns first object of the list of wakeup sources. |
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* |
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* Note that to be safe, wakeup sources list needs to be locked by calling |
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* wakeup_source_read_lock() for this. |
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*/ |
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struct wakeup_source *wakeup_sources_walk_start(void) |
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{ |
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struct list_head *ws_head = &wakeup_sources; |
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return list_entry_rcu(ws_head->next, struct wakeup_source, entry); |
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} |
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EXPORT_SYMBOL_GPL(wakeup_sources_walk_start); |
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/** |
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* wakeup_sources_walk_next - Get next wakeup source from the list |
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* @ws: Previous wakeup source object |
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* |
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* Note that to be safe, wakeup sources list needs to be locked by calling |
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* wakeup_source_read_lock() for this. |
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*/ |
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struct wakeup_source *wakeup_sources_walk_next(struct wakeup_source *ws) |
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{ |
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struct list_head *ws_head = &wakeup_sources; |
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return list_next_or_null_rcu(ws_head, &ws->entry, |
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struct wakeup_source, entry); |
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} |
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EXPORT_SYMBOL_GPL(wakeup_sources_walk_next); |
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/** |
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* device_wakeup_attach - Attach a wakeup source object to a device object. |
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* @dev: Device to handle. |
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* @ws: Wakeup source object to attach to @dev. |
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* |
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* This causes @dev to be treated as a wakeup device. |
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*/ |
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static int device_wakeup_attach(struct device *dev, struct wakeup_source *ws) |
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{ |
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spin_lock_irq(&dev->power.lock); |
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if (dev->power.wakeup) { |
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spin_unlock_irq(&dev->power.lock); |
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return -EEXIST; |
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} |
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dev->power.wakeup = ws; |
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if (dev->power.wakeirq) |
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device_wakeup_attach_irq(dev, dev->power.wakeirq); |
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spin_unlock_irq(&dev->power.lock); |
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return 0; |
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} |
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/** |
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* device_wakeup_enable - Enable given device to be a wakeup source. |
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* @dev: Device to handle. |
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* |
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* Create a wakeup source object, register it and attach it to @dev. |
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*/ |
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int device_wakeup_enable(struct device *dev) |
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{ |
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struct wakeup_source *ws; |
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int ret; |
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if (!dev || !dev->power.can_wakeup) |
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return -EINVAL; |
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if (pm_suspend_target_state != PM_SUSPEND_ON) |
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dev_dbg(dev, "Suspicious %s() during system transition!\n", __func__); |
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ws = wakeup_source_register(dev, dev_name(dev)); |
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if (!ws) |
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return -ENOMEM; |
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ret = device_wakeup_attach(dev, ws); |
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if (ret) |
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wakeup_source_unregister(ws); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(device_wakeup_enable); |
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/** |
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* device_wakeup_attach_irq - Attach a wakeirq to a wakeup source |
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* @dev: Device to handle |
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* @wakeirq: Device specific wakeirq entry |
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* |
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* Attach a device wakeirq to the wakeup source so the device |
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* wake IRQ can be configured automatically for suspend and |
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* resume. |
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* |
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* Call under the device's power.lock lock. |
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*/ |
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void device_wakeup_attach_irq(struct device *dev, |
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struct wake_irq *wakeirq) |
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{ |
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struct wakeup_source *ws; |
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ws = dev->power.wakeup; |
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if (!ws) |
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return; |
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if (ws->wakeirq) |
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dev_err(dev, "Leftover wakeup IRQ found, overriding\n"); |
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ws->wakeirq = wakeirq; |
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} |
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/** |
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* device_wakeup_detach_irq - Detach a wakeirq from a wakeup source |
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* @dev: Device to handle |
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* |
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* Removes a device wakeirq from the wakeup source. |
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* |
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* Call under the device's power.lock lock. |
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*/ |
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void device_wakeup_detach_irq(struct device *dev) |
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{ |
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struct wakeup_source *ws; |
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ws = dev->power.wakeup; |
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if (ws) |
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ws->wakeirq = NULL; |
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} |
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/** |
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* device_wakeup_arm_wake_irqs(void) |
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* |
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* Itereates over the list of device wakeirqs to arm them. |
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*/ |
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void device_wakeup_arm_wake_irqs(void) |
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{ |
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struct wakeup_source *ws; |
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int srcuidx; |
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srcuidx = srcu_read_lock(&wakeup_srcu); |
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list_for_each_entry_rcu_locked(ws, &wakeup_sources, entry) |
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dev_pm_arm_wake_irq(ws->wakeirq); |
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srcu_read_unlock(&wakeup_srcu, srcuidx); |
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} |
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/** |
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* device_wakeup_disarm_wake_irqs(void) |
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* |
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* Itereates over the list of device wakeirqs to disarm them. |
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*/ |
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void device_wakeup_disarm_wake_irqs(void) |
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{ |
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struct wakeup_source *ws; |
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int srcuidx; |
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srcuidx = srcu_read_lock(&wakeup_srcu); |
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list_for_each_entry_rcu_locked(ws, &wakeup_sources, entry) |
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dev_pm_disarm_wake_irq(ws->wakeirq); |
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srcu_read_unlock(&wakeup_srcu, srcuidx); |
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} |
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/** |
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* device_wakeup_detach - Detach a device's wakeup source object from it. |
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* @dev: Device to detach the wakeup source object from. |
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* |
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* After it returns, @dev will not be treated as a wakeup device any more. |
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*/ |
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static struct wakeup_source *device_wakeup_detach(struct device *dev) |
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{ |
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struct wakeup_source *ws; |
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spin_lock_irq(&dev->power.lock); |
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ws = dev->power.wakeup; |
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dev->power.wakeup = NULL; |
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spin_unlock_irq(&dev->power.lock); |
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return ws; |
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} |
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/** |
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* device_wakeup_disable - Do not regard a device as a wakeup source any more. |
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* @dev: Device to handle. |
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* |
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* Detach the @dev's wakeup source object from it, unregister this wakeup source |
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* object and destroy it. |
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*/ |
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int device_wakeup_disable(struct device *dev) |
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{ |
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struct wakeup_source *ws; |
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|
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if (!dev || !dev->power.can_wakeup) |
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return -EINVAL; |
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ws = device_wakeup_detach(dev); |
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wakeup_source_unregister(ws); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(device_wakeup_disable); |
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|
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/** |
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* device_set_wakeup_capable - Set/reset device wakeup capability flag. |
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* @dev: Device to handle. |
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* @capable: Whether or not @dev is capable of waking up the system from sleep. |
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* |
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* If @capable is set, set the @dev's power.can_wakeup flag and add its |
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* wakeup-related attributes to sysfs. Otherwise, unset the @dev's |
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* power.can_wakeup flag and remove its wakeup-related attributes from sysfs. |
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* |
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* This function may sleep and it can't be called from any context where |
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* sleeping is not allowed. |
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*/ |
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void device_set_wakeup_capable(struct device *dev, bool capable) |
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{ |
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if (!!dev->power.can_wakeup == !!capable) |
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return; |
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dev->power.can_wakeup = capable; |
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if (device_is_registered(dev) && !list_empty(&dev->power.entry)) { |
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if (capable) { |
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int ret = wakeup_sysfs_add(dev); |
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|
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if (ret) |
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dev_info(dev, "Wakeup sysfs attributes not added\n"); |
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} else { |
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wakeup_sysfs_remove(dev); |
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} |
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} |
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} |
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EXPORT_SYMBOL_GPL(device_set_wakeup_capable); |
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|
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/** |
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* device_init_wakeup - Device wakeup initialization. |
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* @dev: Device to handle. |
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* @enable: Whether or not to enable @dev as a wakeup device. |
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* |
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* By default, most devices should leave wakeup disabled. The exceptions are |
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* devices that everyone expects to be wakeup sources: keyboards, power buttons, |
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* possibly network interfaces, etc. Also, devices that don't generate their |
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* own wakeup requests but merely forward requests from one bus to another |
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* (like PCI bridges) should have wakeup enabled by default. |
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*/ |
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int device_init_wakeup(struct device *dev, bool enable) |
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{ |
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int ret = 0; |
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|
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if (!dev) |
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return -EINVAL; |
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|
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if (enable) { |
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device_set_wakeup_capable(dev, true); |
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ret = device_wakeup_enable(dev); |
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} else { |
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device_wakeup_disable(dev); |
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device_set_wakeup_capable(dev, false); |
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} |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(device_init_wakeup); |
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|
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/** |
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* device_set_wakeup_enable - Enable or disable a device to wake up the system. |
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* @dev: Device to handle. |
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*/ |
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int device_set_wakeup_enable(struct device *dev, bool enable) |
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{ |
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return enable ? device_wakeup_enable(dev) : device_wakeup_disable(dev); |
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} |
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EXPORT_SYMBOL_GPL(device_set_wakeup_enable); |
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|
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/** |
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* wakeup_source_not_registered - validate the given wakeup source. |
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* @ws: Wakeup source to be validated. |
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*/ |
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static bool wakeup_source_not_registered(struct wakeup_source *ws) |
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{ |
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/* |
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* Use timer struct to check if the given source is initialized |
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* by wakeup_source_add. |
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*/ |
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return ws->timer.function != pm_wakeup_timer_fn; |
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} |
|
|
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/* |
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* The functions below use the observation that each wakeup event starts a |
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* period in which the system should not be suspended. The moment this period |
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* will end depends on how the wakeup event is going to be processed after being |
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* detected and all of the possible cases can be divided into two distinct |
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* groups. |
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* |
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* First, a wakeup event may be detected by the same functional unit that will |
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* carry out the entire processing of it and possibly will pass it to user space |
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* for further processing. In that case the functional unit that has detected |
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* the event may later "close" the "no suspend" period associated with it |
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* directly as soon as it has been dealt with. The pair of pm_stay_awake() and |
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* pm_relax(), balanced with each other, is supposed to be used in such |
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* situations. |
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* |
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* Second, a wakeup event may be detected by one functional unit and processed |
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* by another one. In that case the unit that has detected it cannot really |
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* "close" the "no suspend" period associated with it, unless it knows in |
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* advance what's going to happen to the event during processing. This |
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* knowledge, however, may not be available to it, so it can simply specify time |
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* to wait before the system can be suspended and pass it as the second |
|
* argument of pm_wakeup_event(). |
|
* |
|
* It is valid to call pm_relax() after pm_wakeup_event(), in which case the |
|
* "no suspend" period will be ended either by the pm_relax(), or by the timer |
|
* function executed when the timer expires, whichever comes first. |
|
*/ |
|
|
|
/** |
|
* wakup_source_activate - Mark given wakeup source as active. |
|
* @ws: Wakeup source to handle. |
|
* |
|
* Update the @ws' statistics and, if @ws has just been activated, notify the PM |
|
* core of the event by incrementing the counter of of wakeup events being |
|
* processed. |
|
*/ |
|
static void wakeup_source_activate(struct wakeup_source *ws) |
|
{ |
|
unsigned int cec; |
|
|
|
if (WARN_ONCE(wakeup_source_not_registered(ws), |
|
"unregistered wakeup source\n")) |
|
return; |
|
|
|
ws->active = true; |
|
ws->active_count++; |
|
ws->last_time = ktime_get(); |
|
if (ws->autosleep_enabled) |
|
ws->start_prevent_time = ws->last_time; |
|
|
|
/* Increment the counter of events in progress. */ |
|
cec = atomic_inc_return(&combined_event_count); |
|
|
|
trace_wakeup_source_activate(ws->name, cec); |
|
} |
|
|
|
/** |
|
* wakeup_source_report_event - Report wakeup event using the given source. |
|
* @ws: Wakeup source to report the event for. |
|
* @hard: If set, abort suspends in progress and wake up from suspend-to-idle. |
|
*/ |
|
static void wakeup_source_report_event(struct wakeup_source *ws, bool hard) |
|
{ |
|
ws->event_count++; |
|
/* This is racy, but the counter is approximate anyway. */ |
|
if (events_check_enabled) |
|
ws->wakeup_count++; |
|
|
|
if (!ws->active) |
|
wakeup_source_activate(ws); |
|
|
|
if (hard) |
|
pm_system_wakeup(); |
|
} |
|
|
|
/** |
|
* __pm_stay_awake - Notify the PM core of a wakeup event. |
|
* @ws: Wakeup source object associated with the source of the event. |
|
* |
|
* It is safe to call this function from interrupt context. |
|
*/ |
|
void __pm_stay_awake(struct wakeup_source *ws) |
|
{ |
|
unsigned long flags; |
|
|
|
if (!ws) |
|
return; |
|
|
|
spin_lock_irqsave(&ws->lock, flags); |
|
|
|
wakeup_source_report_event(ws, false); |
|
del_timer(&ws->timer); |
|
ws->timer_expires = 0; |
|
|
|
spin_unlock_irqrestore(&ws->lock, flags); |
|
} |
|
EXPORT_SYMBOL_GPL(__pm_stay_awake); |
|
|
|
/** |
|
* pm_stay_awake - Notify the PM core that a wakeup event is being processed. |
|
* @dev: Device the wakeup event is related to. |
|
* |
|
* Notify the PM core of a wakeup event (signaled by @dev) by calling |
|
* __pm_stay_awake for the @dev's wakeup source object. |
|
* |
|
* Call this function after detecting of a wakeup event if pm_relax() is going |
|
* to be called directly after processing the event (and possibly passing it to |
|
* user space for further processing). |
|
*/ |
|
void pm_stay_awake(struct device *dev) |
|
{ |
|
unsigned long flags; |
|
|
|
if (!dev) |
|
return; |
|
|
|
spin_lock_irqsave(&dev->power.lock, flags); |
|
__pm_stay_awake(dev->power.wakeup); |
|
spin_unlock_irqrestore(&dev->power.lock, flags); |
|
} |
|
EXPORT_SYMBOL_GPL(pm_stay_awake); |
|
|
|
#ifdef CONFIG_PM_AUTOSLEEP |
|
static void update_prevent_sleep_time(struct wakeup_source *ws, ktime_t now) |
|
{ |
|
ktime_t delta = ktime_sub(now, ws->start_prevent_time); |
|
ws->prevent_sleep_time = ktime_add(ws->prevent_sleep_time, delta); |
|
} |
|
#else |
|
static inline void update_prevent_sleep_time(struct wakeup_source *ws, |
|
ktime_t now) {} |
|
#endif |
|
|
|
/** |
|
* wakup_source_deactivate - Mark given wakeup source as inactive. |
|
* @ws: Wakeup source to handle. |
|
* |
|
* Update the @ws' statistics and notify the PM core that the wakeup source has |
|
* become inactive by decrementing the counter of wakeup events being processed |
|
* and incrementing the counter of registered wakeup events. |
|
*/ |
|
static void wakeup_source_deactivate(struct wakeup_source *ws) |
|
{ |
|
unsigned int cnt, inpr, cec; |
|
ktime_t duration; |
|
ktime_t now; |
|
|
|
ws->relax_count++; |
|
/* |
|
* __pm_relax() may be called directly or from a timer function. |
|
* If it is called directly right after the timer function has been |
|
* started, but before the timer function calls __pm_relax(), it is |
|
* possible that __pm_stay_awake() will be called in the meantime and |
|
* will set ws->active. Then, ws->active may be cleared immediately |
|
* by the __pm_relax() called from the timer function, but in such a |
|
* case ws->relax_count will be different from ws->active_count. |
|
*/ |
|
if (ws->relax_count != ws->active_count) { |
|
ws->relax_count--; |
|
return; |
|
} |
|
|
|
ws->active = false; |
|
|
|
now = ktime_get(); |
|
duration = ktime_sub(now, ws->last_time); |
|
ws->total_time = ktime_add(ws->total_time, duration); |
|
if (ktime_to_ns(duration) > ktime_to_ns(ws->max_time)) |
|
ws->max_time = duration; |
|
|
|
ws->last_time = now; |
|
del_timer(&ws->timer); |
|
ws->timer_expires = 0; |
|
|
|
if (ws->autosleep_enabled) |
|
update_prevent_sleep_time(ws, now); |
|
|
|
/* |
|
* Increment the counter of registered wakeup events and decrement the |
|
* couter of wakeup events in progress simultaneously. |
|
*/ |
|
cec = atomic_add_return(MAX_IN_PROGRESS, &combined_event_count); |
|
trace_wakeup_source_deactivate(ws->name, cec); |
|
|
|
split_counters(&cnt, &inpr); |
|
if (!inpr && waitqueue_active(&wakeup_count_wait_queue)) |
|
wake_up(&wakeup_count_wait_queue); |
|
} |
|
|
|
/** |
|
* __pm_relax - Notify the PM core that processing of a wakeup event has ended. |
|
* @ws: Wakeup source object associated with the source of the event. |
|
* |
|
* Call this function for wakeup events whose processing started with calling |
|
* __pm_stay_awake(). |
|
* |
|
* It is safe to call it from interrupt context. |
|
*/ |
|
void __pm_relax(struct wakeup_source *ws) |
|
{ |
|
unsigned long flags; |
|
|
|
if (!ws) |
|
return; |
|
|
|
spin_lock_irqsave(&ws->lock, flags); |
|
if (ws->active) |
|
wakeup_source_deactivate(ws); |
|
spin_unlock_irqrestore(&ws->lock, flags); |
|
} |
|
EXPORT_SYMBOL_GPL(__pm_relax); |
|
|
|
/** |
|
* pm_relax - Notify the PM core that processing of a wakeup event has ended. |
|
* @dev: Device that signaled the event. |
|
* |
|
* Execute __pm_relax() for the @dev's wakeup source object. |
|
*/ |
|
void pm_relax(struct device *dev) |
|
{ |
|
unsigned long flags; |
|
|
|
if (!dev) |
|
return; |
|
|
|
spin_lock_irqsave(&dev->power.lock, flags); |
|
__pm_relax(dev->power.wakeup); |
|
spin_unlock_irqrestore(&dev->power.lock, flags); |
|
} |
|
EXPORT_SYMBOL_GPL(pm_relax); |
|
|
|
/** |
|
* pm_wakeup_timer_fn - Delayed finalization of a wakeup event. |
|
* @data: Address of the wakeup source object associated with the event source. |
|
* |
|
* Call wakeup_source_deactivate() for the wakeup source whose address is stored |
|
* in @data if it is currently active and its timer has not been canceled and |
|
* the expiration time of the timer is not in future. |
|
*/ |
|
static void pm_wakeup_timer_fn(struct timer_list *t) |
|
{ |
|
struct wakeup_source *ws = from_timer(ws, t, timer); |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&ws->lock, flags); |
|
|
|
if (ws->active && ws->timer_expires |
|
&& time_after_eq(jiffies, ws->timer_expires)) { |
|
wakeup_source_deactivate(ws); |
|
ws->expire_count++; |
|
} |
|
|
|
spin_unlock_irqrestore(&ws->lock, flags); |
|
} |
|
|
|
/** |
|
* pm_wakeup_ws_event - Notify the PM core of a wakeup event. |
|
* @ws: Wakeup source object associated with the event source. |
|
* @msec: Anticipated event processing time (in milliseconds). |
|
* @hard: If set, abort suspends in progress and wake up from suspend-to-idle. |
|
* |
|
* Notify the PM core of a wakeup event whose source is @ws that will take |
|
* approximately @msec milliseconds to be processed by the kernel. If @ws is |
|
* not active, activate it. If @msec is nonzero, set up the @ws' timer to |
|
* execute pm_wakeup_timer_fn() in future. |
|
* |
|
* It is safe to call this function from interrupt context. |
|
*/ |
|
void pm_wakeup_ws_event(struct wakeup_source *ws, unsigned int msec, bool hard) |
|
{ |
|
unsigned long flags; |
|
unsigned long expires; |
|
|
|
if (!ws) |
|
return; |
|
|
|
spin_lock_irqsave(&ws->lock, flags); |
|
|
|
wakeup_source_report_event(ws, hard); |
|
|
|
if (!msec) { |
|
wakeup_source_deactivate(ws); |
|
goto unlock; |
|
} |
|
|
|
expires = jiffies + msecs_to_jiffies(msec); |
|
if (!expires) |
|
expires = 1; |
|
|
|
if (!ws->timer_expires || time_after(expires, ws->timer_expires)) { |
|
mod_timer(&ws->timer, expires); |
|
ws->timer_expires = expires; |
|
} |
|
|
|
unlock: |
|
spin_unlock_irqrestore(&ws->lock, flags); |
|
} |
|
EXPORT_SYMBOL_GPL(pm_wakeup_ws_event); |
|
|
|
/** |
|
* pm_wakeup_dev_event - Notify the PM core of a wakeup event. |
|
* @dev: Device the wakeup event is related to. |
|
* @msec: Anticipated event processing time (in milliseconds). |
|
* @hard: If set, abort suspends in progress and wake up from suspend-to-idle. |
|
* |
|
* Call pm_wakeup_ws_event() for the @dev's wakeup source object. |
|
*/ |
|
void pm_wakeup_dev_event(struct device *dev, unsigned int msec, bool hard) |
|
{ |
|
unsigned long flags; |
|
|
|
if (!dev) |
|
return; |
|
|
|
spin_lock_irqsave(&dev->power.lock, flags); |
|
pm_wakeup_ws_event(dev->power.wakeup, msec, hard); |
|
spin_unlock_irqrestore(&dev->power.lock, flags); |
|
} |
|
EXPORT_SYMBOL_GPL(pm_wakeup_dev_event); |
|
|
|
void pm_print_active_wakeup_sources(void) |
|
{ |
|
struct wakeup_source *ws; |
|
int srcuidx, active = 0; |
|
struct wakeup_source *last_activity_ws = NULL; |
|
|
|
srcuidx = srcu_read_lock(&wakeup_srcu); |
|
list_for_each_entry_rcu_locked(ws, &wakeup_sources, entry) { |
|
if (ws->active) { |
|
pm_pr_dbg("active wakeup source: %s\n", ws->name); |
|
active = 1; |
|
} else if (!active && |
|
(!last_activity_ws || |
|
ktime_to_ns(ws->last_time) > |
|
ktime_to_ns(last_activity_ws->last_time))) { |
|
last_activity_ws = ws; |
|
} |
|
} |
|
|
|
if (!active && last_activity_ws) |
|
pm_pr_dbg("last active wakeup source: %s\n", |
|
last_activity_ws->name); |
|
srcu_read_unlock(&wakeup_srcu, srcuidx); |
|
} |
|
EXPORT_SYMBOL_GPL(pm_print_active_wakeup_sources); |
|
|
|
/** |
|
* pm_wakeup_pending - Check if power transition in progress should be aborted. |
|
* |
|
* Compare the current number of registered wakeup events with its preserved |
|
* value from the past and return true if new wakeup events have been registered |
|
* since the old value was stored. Also return true if the current number of |
|
* wakeup events being processed is different from zero. |
|
*/ |
|
bool pm_wakeup_pending(void) |
|
{ |
|
unsigned long flags; |
|
bool ret = false; |
|
|
|
raw_spin_lock_irqsave(&events_lock, flags); |
|
if (events_check_enabled) { |
|
unsigned int cnt, inpr; |
|
|
|
split_counters(&cnt, &inpr); |
|
ret = (cnt != saved_count || inpr > 0); |
|
events_check_enabled = !ret; |
|
} |
|
raw_spin_unlock_irqrestore(&events_lock, flags); |
|
|
|
if (ret) { |
|
pm_pr_dbg("Wakeup pending, aborting suspend\n"); |
|
pm_print_active_wakeup_sources(); |
|
} |
|
|
|
return ret || atomic_read(&pm_abort_suspend) > 0; |
|
} |
|
|
|
void pm_system_wakeup(void) |
|
{ |
|
atomic_inc(&pm_abort_suspend); |
|
s2idle_wake(); |
|
} |
|
EXPORT_SYMBOL_GPL(pm_system_wakeup); |
|
|
|
void pm_system_cancel_wakeup(void) |
|
{ |
|
atomic_dec_if_positive(&pm_abort_suspend); |
|
} |
|
|
|
void pm_wakeup_clear(bool reset) |
|
{ |
|
pm_wakeup_irq = 0; |
|
if (reset) |
|
atomic_set(&pm_abort_suspend, 0); |
|
} |
|
|
|
void pm_system_irq_wakeup(unsigned int irq_number) |
|
{ |
|
if (pm_wakeup_irq == 0) { |
|
pm_wakeup_irq = irq_number; |
|
pm_system_wakeup(); |
|
} |
|
} |
|
|
|
/** |
|
* pm_get_wakeup_count - Read the number of registered wakeup events. |
|
* @count: Address to store the value at. |
|
* @block: Whether or not to block. |
|
* |
|
* Store the number of registered wakeup events at the address in @count. If |
|
* @block is set, block until the current number of wakeup events being |
|
* processed is zero. |
|
* |
|
* Return 'false' if the current number of wakeup events being processed is |
|
* nonzero. Otherwise return 'true'. |
|
*/ |
|
bool pm_get_wakeup_count(unsigned int *count, bool block) |
|
{ |
|
unsigned int cnt, inpr; |
|
|
|
if (block) { |
|
DEFINE_WAIT(wait); |
|
|
|
for (;;) { |
|
prepare_to_wait(&wakeup_count_wait_queue, &wait, |
|
TASK_INTERRUPTIBLE); |
|
split_counters(&cnt, &inpr); |
|
if (inpr == 0 || signal_pending(current)) |
|
break; |
|
pm_print_active_wakeup_sources(); |
|
schedule(); |
|
} |
|
finish_wait(&wakeup_count_wait_queue, &wait); |
|
} |
|
|
|
split_counters(&cnt, &inpr); |
|
*count = cnt; |
|
return !inpr; |
|
} |
|
|
|
/** |
|
* pm_save_wakeup_count - Save the current number of registered wakeup events. |
|
* @count: Value to compare with the current number of registered wakeup events. |
|
* |
|
* If @count is equal to the current number of registered wakeup events and the |
|
* current number of wakeup events being processed is zero, store @count as the |
|
* old number of registered wakeup events for pm_check_wakeup_events(), enable |
|
* wakeup events detection and return 'true'. Otherwise disable wakeup events |
|
* detection and return 'false'. |
|
*/ |
|
bool pm_save_wakeup_count(unsigned int count) |
|
{ |
|
unsigned int cnt, inpr; |
|
unsigned long flags; |
|
|
|
events_check_enabled = false; |
|
raw_spin_lock_irqsave(&events_lock, flags); |
|
split_counters(&cnt, &inpr); |
|
if (cnt == count && inpr == 0) { |
|
saved_count = count; |
|
events_check_enabled = true; |
|
} |
|
raw_spin_unlock_irqrestore(&events_lock, flags); |
|
return events_check_enabled; |
|
} |
|
|
|
#ifdef CONFIG_PM_AUTOSLEEP |
|
/** |
|
* pm_wakep_autosleep_enabled - Modify autosleep_enabled for all wakeup sources. |
|
* @enabled: Whether to set or to clear the autosleep_enabled flags. |
|
*/ |
|
void pm_wakep_autosleep_enabled(bool set) |
|
{ |
|
struct wakeup_source *ws; |
|
ktime_t now = ktime_get(); |
|
int srcuidx; |
|
|
|
srcuidx = srcu_read_lock(&wakeup_srcu); |
|
list_for_each_entry_rcu_locked(ws, &wakeup_sources, entry) { |
|
spin_lock_irq(&ws->lock); |
|
if (ws->autosleep_enabled != set) { |
|
ws->autosleep_enabled = set; |
|
if (ws->active) { |
|
if (set) |
|
ws->start_prevent_time = now; |
|
else |
|
update_prevent_sleep_time(ws, now); |
|
} |
|
} |
|
spin_unlock_irq(&ws->lock); |
|
} |
|
srcu_read_unlock(&wakeup_srcu, srcuidx); |
|
} |
|
#endif /* CONFIG_PM_AUTOSLEEP */ |
|
|
|
/** |
|
* print_wakeup_source_stats - Print wakeup source statistics information. |
|
* @m: seq_file to print the statistics into. |
|
* @ws: Wakeup source object to print the statistics for. |
|
*/ |
|
static int print_wakeup_source_stats(struct seq_file *m, |
|
struct wakeup_source *ws) |
|
{ |
|
unsigned long flags; |
|
ktime_t total_time; |
|
ktime_t max_time; |
|
unsigned long active_count; |
|
ktime_t active_time; |
|
ktime_t prevent_sleep_time; |
|
|
|
spin_lock_irqsave(&ws->lock, flags); |
|
|
|
total_time = ws->total_time; |
|
max_time = ws->max_time; |
|
prevent_sleep_time = ws->prevent_sleep_time; |
|
active_count = ws->active_count; |
|
if (ws->active) { |
|
ktime_t now = ktime_get(); |
|
|
|
active_time = ktime_sub(now, ws->last_time); |
|
total_time = ktime_add(total_time, active_time); |
|
if (active_time > max_time) |
|
max_time = active_time; |
|
|
|
if (ws->autosleep_enabled) |
|
prevent_sleep_time = ktime_add(prevent_sleep_time, |
|
ktime_sub(now, ws->start_prevent_time)); |
|
} else { |
|
active_time = 0; |
|
} |
|
|
|
seq_printf(m, "%-12s\t%lu\t\t%lu\t\t%lu\t\t%lu\t\t%lld\t\t%lld\t\t%lld\t\t%lld\t\t%lld\n", |
|
ws->name, active_count, ws->event_count, |
|
ws->wakeup_count, ws->expire_count, |
|
ktime_to_ms(active_time), ktime_to_ms(total_time), |
|
ktime_to_ms(max_time), ktime_to_ms(ws->last_time), |
|
ktime_to_ms(prevent_sleep_time)); |
|
|
|
spin_unlock_irqrestore(&ws->lock, flags); |
|
|
|
return 0; |
|
} |
|
|
|
static void *wakeup_sources_stats_seq_start(struct seq_file *m, |
|
loff_t *pos) |
|
{ |
|
struct wakeup_source *ws; |
|
loff_t n = *pos; |
|
int *srcuidx = m->private; |
|
|
|
if (n == 0) { |
|
seq_puts(m, "name\t\tactive_count\tevent_count\twakeup_count\t" |
|
"expire_count\tactive_since\ttotal_time\tmax_time\t" |
|
"last_change\tprevent_suspend_time\n"); |
|
} |
|
|
|
*srcuidx = srcu_read_lock(&wakeup_srcu); |
|
list_for_each_entry_rcu_locked(ws, &wakeup_sources, entry) { |
|
if (n-- <= 0) |
|
return ws; |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
static void *wakeup_sources_stats_seq_next(struct seq_file *m, |
|
void *v, loff_t *pos) |
|
{ |
|
struct wakeup_source *ws = v; |
|
struct wakeup_source *next_ws = NULL; |
|
|
|
++(*pos); |
|
|
|
list_for_each_entry_continue_rcu(ws, &wakeup_sources, entry) { |
|
next_ws = ws; |
|
break; |
|
} |
|
|
|
if (!next_ws) |
|
print_wakeup_source_stats(m, &deleted_ws); |
|
|
|
return next_ws; |
|
} |
|
|
|
static void wakeup_sources_stats_seq_stop(struct seq_file *m, void *v) |
|
{ |
|
int *srcuidx = m->private; |
|
|
|
srcu_read_unlock(&wakeup_srcu, *srcuidx); |
|
} |
|
|
|
/** |
|
* wakeup_sources_stats_seq_show - Print wakeup sources statistics information. |
|
* @m: seq_file to print the statistics into. |
|
* @v: wakeup_source of each iteration |
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*/ |
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static int wakeup_sources_stats_seq_show(struct seq_file *m, void *v) |
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{ |
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struct wakeup_source *ws = v; |
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|
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print_wakeup_source_stats(m, ws); |
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return 0; |
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} |
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static const struct seq_operations wakeup_sources_stats_seq_ops = { |
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.start = wakeup_sources_stats_seq_start, |
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.next = wakeup_sources_stats_seq_next, |
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.stop = wakeup_sources_stats_seq_stop, |
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.show = wakeup_sources_stats_seq_show, |
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}; |
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static int wakeup_sources_stats_open(struct inode *inode, struct file *file) |
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{ |
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return seq_open_private(file, &wakeup_sources_stats_seq_ops, sizeof(int)); |
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} |
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static const struct file_operations wakeup_sources_stats_fops = { |
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.owner = THIS_MODULE, |
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.open = wakeup_sources_stats_open, |
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.read = seq_read, |
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.llseek = seq_lseek, |
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.release = seq_release_private, |
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}; |
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static int __init wakeup_sources_debugfs_init(void) |
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{ |
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debugfs_create_file("wakeup_sources", S_IRUGO, NULL, NULL, |
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&wakeup_sources_stats_fops); |
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return 0; |
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} |
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postcore_initcall(wakeup_sources_debugfs_init);
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