// SPDX-License-Identifier: GPL-2.0 /* * wakeup.c - support wakeup devices * Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com> */ #include <linux/init.h> #include <linux/acpi.h> #include <linux/kernel.h> #include <linux/types.h> #include "internal.h" #include "sleep.h" /* * We didn't lock acpi_device_lock in the file, because it invokes oops in * suspend/resume and isn't really required as this is called in S-state. At * that time, there is no device hotplug **/ #define _COMPONENT ACPI_SYSTEM_COMPONENT ACPI_MODULE_NAME("wakeup_devices") /** * acpi_enable_wakeup_devices - Enable wake-up device GPEs. * @sleep_state: ACPI system sleep state. * * Enable wakeup device power of devices with the state.enable flag set and set * the wakeup enable mask bits in the GPE registers that correspond to wakeup * devices. */ void acpi_enable_wakeup_devices(u8 sleep_state) { struct list_head *node, *next; list_for_each_safe(node, next, &acpi_wakeup_device_list) { struct acpi_device *dev = container_of(node, struct acpi_device, wakeup_list); if (!dev->wakeup.flags.valid || sleep_state > (u32) dev->wakeup.sleep_state || !(device_may_wakeup(&dev->dev) || dev->wakeup.prepare_count)) continue; if (device_may_wakeup(&dev->dev)) acpi_enable_wakeup_device_power(dev, sleep_state); /* The wake-up power should have been enabled already. */ acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number, ACPI_GPE_ENABLE); } } /** * acpi_disable_wakeup_devices - Disable devices' wakeup capability. * @sleep_state: ACPI system sleep state. */ void acpi_disable_wakeup_devices(u8 sleep_state) { struct list_head *node, *next; list_for_each_safe(node, next, &acpi_wakeup_device_list) { struct acpi_device *dev = container_of(node, struct acpi_device, wakeup_list); if (!dev->wakeup.flags.valid || sleep_state > (u32) dev->wakeup.sleep_state || !(device_may_wakeup(&dev->dev) || dev->wakeup.prepare_count)) continue; acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number, ACPI_GPE_DISABLE); if (device_may_wakeup(&dev->dev)) acpi_disable_wakeup_device_power(dev); } } int __init acpi_wakeup_device_init(void) { struct list_head *node, *next; mutex_lock(&acpi_device_lock); list_for_each_safe(node, next, &acpi_wakeup_device_list) { struct acpi_device *dev = container_of(node, struct acpi_device, wakeup_list); if (device_can_wakeup(&dev->dev)) { /* Button GPEs are supposed to be always enabled. */ acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number); device_set_wakeup_enable(&dev->dev, true); } } mutex_unlock(&acpi_device_lock); return 0; }