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 21 ACPI_MODULE_NAME("wakeup_devices") 22 23 /** 24 * acpi_enable_wakeup_device_prep - Prepare wake-up devices. 25 * @sleep_state: ACPI system sleep state. 26 * 27 * Enable all wake-up devices' power, unless the requested system sleep state is 28 * too deep. 29 */ 30 void acpi_enable_wakeup_device_prep(u8 sleep_state) 31 { 32 struct list_head *node, *next; 33 34 list_for_each_safe(node, next, &acpi_wakeup_device_list) { 35 struct acpi_device *dev = container_of(node, 36 struct acpi_device, 37 wakeup_list); 38 39 if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled 40 || (sleep_state > (u32) dev->wakeup.sleep_state)) 41 continue; 42 43 acpi_enable_wakeup_device_power(dev, sleep_state); 44 } 45 } 46 47 /** 48 * acpi_enable_wakeup_device - Enable wake-up device GPEs. 49 * @sleep_state: ACPI system sleep state. 50 * 51 * Enable all wake-up devices' GPEs, with the assumption that 52 * acpi_disable_all_gpes() was executed before, so we don't need to disable any 53 * GPEs here. 54 */ 55 void acpi_enable_wakeup_device(u8 sleep_state) 56 { 57 struct list_head *node, *next; 58 59 /* 60 * Caution: this routine must be invoked when interrupt is disabled 61 * Refer ACPI2.0: P212 62 */ 63 list_for_each_safe(node, next, &acpi_wakeup_device_list) { 64 struct acpi_device *dev = 65 container_of(node, struct acpi_device, wakeup_list); 66 67 if (!dev->wakeup.flags.valid 68 || !(dev->wakeup.state.enabled || dev->wakeup.prepare_count) 69 || sleep_state > (u32) dev->wakeup.sleep_state) 70 continue; 71 72 /* The wake-up power should have been enabled already. */ 73 acpi_gpe_wakeup(dev->wakeup.gpe_device, dev->wakeup.gpe_number, 74 ACPI_GPE_ENABLE); 75 } 76 } 77 78 /** 79 * acpi_disable_wakeup_device - Disable devices' wakeup capability. 80 * @sleep_state: ACPI system sleep state. 81 * 82 * This function only affects devices with wakeup.state.enabled set, which means 83 * that it reverses the changes made by acpi_enable_wakeup_device_prep(). 84 */ 85 void acpi_disable_wakeup_device(u8 sleep_state) 86 { 87 struct list_head *node, *next; 88 89 list_for_each_safe(node, next, &acpi_wakeup_device_list) { 90 struct acpi_device *dev = 91 container_of(node, struct acpi_device, wakeup_list); 92 93 if (!dev->wakeup.flags.valid 94 || !(dev->wakeup.state.enabled || dev->wakeup.prepare_count) 95 || (sleep_state > (u32) dev->wakeup.sleep_state)) 96 continue; 97 98 acpi_gpe_wakeup(dev->wakeup.gpe_device, dev->wakeup.gpe_number, 99 ACPI_GPE_DISABLE); 100 101 if (dev->wakeup.state.enabled) 102 acpi_disable_wakeup_device_power(dev); 103 } 104 } 105 106 int __init acpi_wakeup_device_init(void) 107 { 108 struct list_head *node, *next; 109 110 mutex_lock(&acpi_device_lock); 111 list_for_each_safe(node, next, &acpi_wakeup_device_list) { 112 struct acpi_device *dev = container_of(node, 113 struct acpi_device, 114 wakeup_list); 115 if (dev->wakeup.flags.always_enabled) 116 dev->wakeup.state.enabled = 1; 117 } 118 mutex_unlock(&acpi_device_lock); 119 return 0; 120 } 121