1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * wakeup.c - support wakeup devices 4 * Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com> 5 */ 6 7 #include <linux/init.h> 8 #include <linux/acpi.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_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 */ 31 void 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 || sleep_state > (u32) dev->wakeup.sleep_state 41 || !(device_may_wakeup(&dev->dev) 42 || dev->wakeup.prepare_count)) 43 continue; 44 45 if (device_may_wakeup(&dev->dev)) 46 acpi_enable_wakeup_device_power(dev, sleep_state); 47 48 /* The wake-up power should have been enabled already. */ 49 acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number, 50 ACPI_GPE_ENABLE); 51 } 52 } 53 54 /** 55 * acpi_disable_wakeup_devices - Disable devices' wakeup capability. 56 * @sleep_state: ACPI system sleep state. 57 */ 58 void acpi_disable_wakeup_devices(u8 sleep_state) 59 { 60 struct list_head *node, *next; 61 62 list_for_each_safe(node, next, &acpi_wakeup_device_list) { 63 struct acpi_device *dev = 64 container_of(node, struct acpi_device, wakeup_list); 65 66 if (!dev->wakeup.flags.valid 67 || sleep_state > (u32) dev->wakeup.sleep_state 68 || !(device_may_wakeup(&dev->dev) 69 || dev->wakeup.prepare_count)) 70 continue; 71 72 acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number, 73 ACPI_GPE_DISABLE); 74 75 if (device_may_wakeup(&dev->dev)) 76 acpi_disable_wakeup_device_power(dev); 77 } 78 } 79 80 int __init acpi_wakeup_device_init(void) 81 { 82 struct list_head *node, *next; 83 84 mutex_lock(&acpi_device_lock); 85 list_for_each_safe(node, next, &acpi_wakeup_device_list) { 86 struct acpi_device *dev = container_of(node, 87 struct acpi_device, 88 wakeup_list); 89 if (device_can_wakeup(&dev->dev)) { 90 /* Button GPEs are supposed to be always enabled. */ 91 acpi_enable_gpe(dev->wakeup.gpe_device, 92 dev->wakeup.gpe_number); 93 device_set_wakeup_enable(&dev->dev, true); 94 } 95 } 96 mutex_unlock(&acpi_device_lock); 97 return 0; 98 } 99