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 continue; 69 70 if ((!dev->wakeup.state.enabled && !dev->wakeup.prepare_count) 71 || sleep_state > (u32) dev->wakeup.sleep_state) 72 continue; 73 74 /* The wake-up power should have been enabled already. */ 75 acpi_set_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number, 76 ACPI_GPE_ENABLE); 77 } 78 } 79 80 /** 81 * acpi_disable_wakeup_device - Disable devices' wakeup capability. 82 * @sleep_state: ACPI system sleep state. 83 * 84 * This function only affects devices with wakeup.state.enabled set, which means 85 * that it reverses the changes made by acpi_enable_wakeup_device_prep(). 86 */ 87 void acpi_disable_wakeup_device(u8 sleep_state) 88 { 89 struct list_head *node, *next; 90 91 list_for_each_safe(node, next, &acpi_wakeup_device_list) { 92 struct acpi_device *dev = 93 container_of(node, struct acpi_device, wakeup_list); 94 95 if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled 96 || (sleep_state > (u32) dev->wakeup.sleep_state)) 97 continue; 98 99 acpi_disable_wakeup_device_power(dev); 100 } 101 } 102 103 int __init acpi_wakeup_device_init(void) 104 { 105 struct list_head *node, *next; 106 107 mutex_lock(&acpi_device_lock); 108 list_for_each_safe(node, next, &acpi_wakeup_device_list) { 109 struct acpi_device *dev = container_of(node, 110 struct acpi_device, 111 wakeup_list); 112 /* In case user doesn't load button driver */ 113 if (!dev->wakeup.flags.always_enabled || 114 dev->wakeup.state.enabled) 115 continue; 116 acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number, 117 ACPI_GPE_TYPE_WAKE); 118 dev->wakeup.state.enabled = 1; 119 } 120 mutex_unlock(&acpi_device_lock); 121 return 0; 122 } 123