| 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 wakeup devices |
| 25 | * @sleep_state: ACPI state |
| 26 | * Enable all wakup devices power if the devices' wakeup level |
| 27 | * is higher than requested sleep level |
| 28 | */ |
| 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 || |
| 40 | !dev->wakeup.state.enabled || |
| 41 | (sleep_state > (u32) dev->wakeup.sleep_state)) |
| 42 | continue; |
| 43 | |
| 44 | acpi_enable_wakeup_device_power(dev, sleep_state); |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * acpi_enable_wakeup_device - enable wakeup devices |
| 50 | * @sleep_state: ACPI state |
| 51 | * Enable all wakup devices's GPE |
| 52 | */ |
| 53 | void acpi_enable_wakeup_device(u8 sleep_state) |
| 54 | { |
| 55 | struct list_head *node, *next; |
| 56 | |
| 57 | /* |
| 58 | * Caution: this routine must be invoked when interrupt is disabled |
| 59 | * Refer ACPI2.0: P212 |
| 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 | continue; |
| 67 | |
| 68 | /* If users want to disable run-wake GPE, |
| 69 | * we only disable it for wake and leave it for runtime |
| 70 | */ |
| 71 | if ((!dev->wakeup.state.enabled && !dev->wakeup.flags.prepared) |
| 72 | || sleep_state > (u32) dev->wakeup.sleep_state) { |
| 73 | if (dev->wakeup.flags.run_wake) { |
| 74 | /* set_gpe_type will disable GPE, leave it like that */ |
| 75 | acpi_set_gpe_type(dev->wakeup.gpe_device, |
| 76 | dev->wakeup.gpe_number, |
| 77 | ACPI_GPE_TYPE_RUNTIME); |
| 78 | } |
| 79 | continue; |
| 80 | } |
| 81 | if (!dev->wakeup.flags.run_wake) |
| 82 | acpi_enable_gpe(dev->wakeup.gpe_device, |
| 83 | dev->wakeup.gpe_number); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * acpi_disable_wakeup_device - disable devices' wakeup capability |
| 89 | * @sleep_state: ACPI state |
| 90 | * Disable all wakup devices's GPE and wakeup capability |
| 91 | */ |
| 92 | void acpi_disable_wakeup_device(u8 sleep_state) |
| 93 | { |
| 94 | struct list_head *node, *next; |
| 95 | |
| 96 | list_for_each_safe(node, next, &acpi_wakeup_device_list) { |
| 97 | struct acpi_device *dev = |
| 98 | container_of(node, struct acpi_device, wakeup_list); |
| 99 | |
| 100 | if (!dev->wakeup.flags.valid) |
| 101 | continue; |
| 102 | |
| 103 | if ((!dev->wakeup.state.enabled && !dev->wakeup.flags.prepared) |
| 104 | || sleep_state > (u32) dev->wakeup.sleep_state) { |
| 105 | if (dev->wakeup.flags.run_wake) { |
| 106 | acpi_set_gpe_type(dev->wakeup.gpe_device, |
| 107 | dev->wakeup.gpe_number, |
| 108 | ACPI_GPE_TYPE_WAKE_RUN); |
| 109 | /* Re-enable it, since set_gpe_type will disable it */ |
| 110 | acpi_enable_gpe(dev->wakeup.gpe_device, |
| 111 | dev->wakeup.gpe_number); |
| 112 | } |
| 113 | continue; |
| 114 | } |
| 115 | |
| 116 | acpi_disable_wakeup_device_power(dev); |
| 117 | /* Never disable run-wake GPE */ |
| 118 | if (!dev->wakeup.flags.run_wake) { |
| 119 | acpi_disable_gpe(dev->wakeup.gpe_device, |
| 120 | dev->wakeup.gpe_number); |
| 121 | acpi_clear_gpe(dev->wakeup.gpe_device, |
| 122 | dev->wakeup.gpe_number, ACPI_NOT_ISR); |
| 123 | } |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | int __init acpi_wakeup_device_init(void) |
| 128 | { |
| 129 | struct list_head *node, *next; |
| 130 | |
| 131 | mutex_lock(&acpi_device_lock); |
| 132 | list_for_each_safe(node, next, &acpi_wakeup_device_list) { |
| 133 | struct acpi_device *dev = container_of(node, |
| 134 | struct acpi_device, |
| 135 | wakeup_list); |
| 136 | /* In case user doesn't load button driver */ |
| 137 | if (!dev->wakeup.flags.run_wake || dev->wakeup.state.enabled) |
| 138 | continue; |
| 139 | acpi_set_gpe_type(dev->wakeup.gpe_device, |
| 140 | dev->wakeup.gpe_number, |
| 141 | ACPI_GPE_TYPE_WAKE_RUN); |
| 142 | acpi_enable_gpe(dev->wakeup.gpe_device, |
| 143 | dev->wakeup.gpe_number); |
| 144 | dev->wakeup.state.enabled = 1; |
| 145 | } |
| 146 | mutex_unlock(&acpi_device_lock); |
| 147 | return 0; |
| 148 | } |