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![Maximilian Luz](/assets/img/avatar_default.png)
Replaces spaces with tabs where spaces have been (inconsistently) used for indentation and removes trailing whitespaces. Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
171 lines
4.6 KiB
C
171 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* wakeup.c - support wakeup devices
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* Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com>
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*/
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include "internal.h"
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#include "sleep.h"
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struct acpi_wakeup_handler {
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struct list_head list_node;
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bool (*wakeup)(void *context);
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void *context;
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};
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static LIST_HEAD(acpi_wakeup_handler_head);
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static DEFINE_MUTEX(acpi_wakeup_handler_mutex);
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/*
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* We didn't lock acpi_device_lock in the file, because it invokes oops in
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* suspend/resume and isn't really required as this is called in S-state. At
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* that time, there is no device hotplug
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**/
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/**
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* acpi_enable_wakeup_devices - Enable wake-up device GPEs.
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* @sleep_state: ACPI system sleep state.
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*
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* Enable wakeup device power of devices with the state.enable flag set and set
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* the wakeup enable mask bits in the GPE registers that correspond to wakeup
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* devices.
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*/
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void acpi_enable_wakeup_devices(u8 sleep_state)
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{
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struct acpi_device *dev, *tmp;
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list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list,
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wakeup_list) {
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if (!dev->wakeup.flags.valid
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|| sleep_state > (u32) dev->wakeup.sleep_state
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|| !(device_may_wakeup(&dev->dev)
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|| dev->wakeup.prepare_count))
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continue;
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if (device_may_wakeup(&dev->dev))
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acpi_enable_wakeup_device_power(dev, sleep_state);
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/* The wake-up power should have been enabled already. */
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acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
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ACPI_GPE_ENABLE);
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}
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}
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/**
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* acpi_disable_wakeup_devices - Disable devices' wakeup capability.
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* @sleep_state: ACPI system sleep state.
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*/
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void acpi_disable_wakeup_devices(u8 sleep_state)
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{
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struct acpi_device *dev, *tmp;
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list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list,
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wakeup_list) {
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if (!dev->wakeup.flags.valid
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|| sleep_state > (u32) dev->wakeup.sleep_state
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|| !(device_may_wakeup(&dev->dev)
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|| dev->wakeup.prepare_count))
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continue;
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acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
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ACPI_GPE_DISABLE);
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if (device_may_wakeup(&dev->dev))
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acpi_disable_wakeup_device_power(dev);
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}
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}
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int __init acpi_wakeup_device_init(void)
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{
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struct acpi_device *dev, *tmp;
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mutex_lock(&acpi_device_lock);
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list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list,
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wakeup_list) {
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if (device_can_wakeup(&dev->dev)) {
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/* Button GPEs are supposed to be always enabled. */
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acpi_enable_gpe(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number);
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device_set_wakeup_enable(&dev->dev, true);
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}
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}
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mutex_unlock(&acpi_device_lock);
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return 0;
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}
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/**
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* acpi_register_wakeup_handler - Register wakeup handler
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* @wake_irq: The IRQ through which the device may receive wakeups
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* @wakeup: Wakeup-handler to call when the SCI has triggered a wakeup
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* @context: Context to pass to the handler when calling it
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*
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* Drivers which may share an IRQ with the SCI can use this to register
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* a handler which returns true when the device they are managing wants
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* to trigger a wakeup.
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*/
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int acpi_register_wakeup_handler(int wake_irq, bool (*wakeup)(void *context),
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void *context)
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{
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struct acpi_wakeup_handler *handler;
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/*
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* If the device is not sharing its IRQ with the SCI, there is no
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* need to register the handler.
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*/
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if (!acpi_sci_irq_valid() || wake_irq != acpi_sci_irq)
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return 0;
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handler = kmalloc(sizeof(*handler), GFP_KERNEL);
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if (!handler)
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return -ENOMEM;
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handler->wakeup = wakeup;
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handler->context = context;
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mutex_lock(&acpi_wakeup_handler_mutex);
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list_add(&handler->list_node, &acpi_wakeup_handler_head);
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mutex_unlock(&acpi_wakeup_handler_mutex);
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return 0;
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}
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EXPORT_SYMBOL_GPL(acpi_register_wakeup_handler);
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/**
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* acpi_unregister_wakeup_handler - Unregister wakeup handler
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* @wakeup: Wakeup-handler passed to acpi_register_wakeup_handler()
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* @context: Context passed to acpi_register_wakeup_handler()
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*/
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void acpi_unregister_wakeup_handler(bool (*wakeup)(void *context),
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void *context)
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{
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struct acpi_wakeup_handler *handler;
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mutex_lock(&acpi_wakeup_handler_mutex);
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list_for_each_entry(handler, &acpi_wakeup_handler_head, list_node) {
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if (handler->wakeup == wakeup && handler->context == context) {
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list_del(&handler->list_node);
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kfree(handler);
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break;
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}
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}
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mutex_unlock(&acpi_wakeup_handler_mutex);
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}
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EXPORT_SYMBOL_GPL(acpi_unregister_wakeup_handler);
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bool acpi_check_wakeup_handlers(void)
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{
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struct acpi_wakeup_handler *handler;
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/* No need to lock, nothing else is running when we're called. */
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list_for_each_entry(handler, &acpi_wakeup_handler_head, list_node) {
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if (handler->wakeup(handler->context))
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return true;
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}
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return false;
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}
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