| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 | } |