| | 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 | } |
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