// 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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/*
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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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#define _COMPONENT ACPI_SYSTEM_COMPONENT
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ACPI_MODULE_NAME("wakeup_devices")
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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 list_head *node, *next;
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list_for_each_safe(node, next, &acpi_wakeup_device_list) {
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struct acpi_device *dev =
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container_of(node, struct acpi_device, 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 list_head *node, *next;
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list_for_each_safe(node, next, &acpi_wakeup_device_list) {
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struct acpi_device *dev =
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container_of(node, struct acpi_device, 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 list_head *node, *next;
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mutex_lock(&acpi_device_lock);
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list_for_each_safe(node, next, &acpi_wakeup_device_list) {
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struct acpi_device *dev = container_of(node,
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struct acpi_device,
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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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