1/* 2 * wakeup.c - support wakeup devices 3 * Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com> 4 */ 5 6#include <linux/init.h> 7#include <linux/acpi.h> 8#include <acpi/acpi_drivers.h> 9#include <linux/kernel.h> 10#include <linux/types.h> 11 12#include "internal.h" 13#include "sleep.h" 14 15/* 16 * We didn't lock acpi_device_lock in the file, because it invokes oops in 17 * suspend/resume and isn't really required as this is called in S-state. At 18 * that time, there is no device hotplug 19 **/ 20#define _COMPONENT ACPI_SYSTEM_COMPONENT 21ACPI_MODULE_NAME("wakeup_devices") 22 23/** 24 * acpi_enable_wakeup_devices - Enable wake-up device GPEs. 25 * @sleep_state: ACPI system sleep state. 26 * 27 * Enable wakeup device power of devices with the state.enable flag set and set 28 * the wakeup enable mask bits in the GPE registers that correspond to wakeup 29 * devices. 30 */ 31void acpi_enable_wakeup_devices(u8 sleep_state) 32{ 33 struct list_head *node, *next; 34 35 list_for_each_safe(node, next, &acpi_wakeup_device_list) { 36 struct acpi_device *dev = 37 container_of(node, struct acpi_device, wakeup_list); 38 39 if (!dev->wakeup.flags.valid 40 || !(dev->wakeup.state.enabled || dev->wakeup.prepare_count) 41 || sleep_state > (u32) dev->wakeup.sleep_state) 42 continue; 43 44 if (dev->wakeup.state.enabled) 45 acpi_enable_wakeup_device_power(dev, sleep_state); 46 47 /* The wake-up power should have been enabled already. */ 48 acpi_gpe_wakeup(dev->wakeup.gpe_device, dev->wakeup.gpe_number, 49 ACPI_GPE_ENABLE); 50 } 51} 52 53/** 54 * acpi_disable_wakeup_devices - Disable devices' wakeup capability. 55 * @sleep_state: ACPI system sleep state. 56 */ 57void acpi_disable_wakeup_devices(u8 sleep_state) 58{ 59 struct list_head *node, *next; 60 61 list_for_each_safe(node, next, &acpi_wakeup_device_list) { 62 struct acpi_device *dev = 63 container_of(node, struct acpi_device, wakeup_list); 64 65 if (!dev->wakeup.flags.valid 66 || !(dev->wakeup.state.enabled || dev->wakeup.prepare_count) 67 || (sleep_state > (u32) dev->wakeup.sleep_state)) 68 continue; 69 70 acpi_gpe_wakeup(dev->wakeup.gpe_device, dev->wakeup.gpe_number, 71 ACPI_GPE_DISABLE); 72 73 if (dev->wakeup.state.enabled) 74 acpi_disable_wakeup_device_power(dev); 75 } 76} 77 78int __init acpi_wakeup_device_init(void) 79{ 80 struct list_head *node, *next; 81 82 mutex_lock(&acpi_device_lock); 83 list_for_each_safe(node, next, &acpi_wakeup_device_list) { 84 struct acpi_device *dev = container_of(node, 85 struct acpi_device, 86 wakeup_list); 87 if (dev->wakeup.flags.always_enabled) 88 dev->wakeup.state.enabled = 1; 89 } 90 mutex_unlock(&acpi_device_lock); 91 return 0; 92} 93