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 <linux/kernel.h> 9 #include <linux/types.h> 10 11 #include "internal.h" 12 #include "sleep.h" 13 14 /* 15 * We didn't lock acpi_device_lock in the file, because it invokes oops in 16 * suspend/resume and isn't really required as this is called in S-state. At 17 * that time, there is no device hotplug 18 **/ 19 #define _COMPONENT ACPI_SYSTEM_COMPONENT 20 ACPI_MODULE_NAME("wakeup_devices") 21 22 /** 23 * acpi_enable_wakeup_devices - Enable wake-up device GPEs. 24 * @sleep_state: ACPI system sleep state. 25 * 26 * Enable wakeup device power of devices with the state.enable flag set and set 27 * the wakeup enable mask bits in the GPE registers that correspond to wakeup 28 * devices. 29 */ 30 void acpi_enable_wakeup_devices(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 = 36 container_of(node, struct acpi_device, wakeup_list); 37 38 if (!dev->wakeup.flags.valid 39 || sleep_state > (u32) dev->wakeup.sleep_state 40 || !(device_may_wakeup(&dev->dev) 41 || dev->wakeup.prepare_count)) 42 continue; 43 44 if (device_may_wakeup(&dev->dev)) 45 acpi_enable_wakeup_device_power(dev, sleep_state); 46 47 /* The wake-up power should have been enabled already. */ 48 acpi_set_gpe_wake_mask(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 */ 57 void 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 || sleep_state > (u32) dev->wakeup.sleep_state 67 || !(device_may_wakeup(&dev->dev) 68 || dev->wakeup.prepare_count)) 69 continue; 70 71 acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number, 72 ACPI_GPE_DISABLE); 73 74 if (device_may_wakeup(&dev->dev)) 75 acpi_disable_wakeup_device_power(dev); 76 } 77 } 78 79 int __init acpi_wakeup_device_init(void) 80 { 81 struct list_head *node, *next; 82 83 mutex_lock(&acpi_device_lock); 84 list_for_each_safe(node, next, &acpi_wakeup_device_list) { 85 struct acpi_device *dev = container_of(node, 86 struct acpi_device, 87 wakeup_list); 88 if (device_can_wakeup(&dev->dev)) { 89 /* Button GPEs are supposed to be always enabled. */ 90 acpi_enable_gpe(dev->wakeup.gpe_device, 91 dev->wakeup.gpe_number); 92 device_set_wakeup_enable(&dev->dev, true); 93 } 94 } 95 mutex_unlock(&acpi_device_lock); 96 return 0; 97 } 98