Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | #include <acpi/acevents.h> |
| 12 | #include "sleep.h" |
| 13 | |
| 14 | #define _COMPONENT ACPI_SYSTEM_COMPONENT |
| 15 | ACPI_MODULE_NAME ("wakeup_devices") |
| 16 | |
| 17 | extern struct list_head acpi_wakeup_device_list; |
| 18 | extern spinlock_t acpi_device_lock; |
| 19 | |
| 20 | #ifdef CONFIG_ACPI_SLEEP |
| 21 | /** |
| 22 | * acpi_enable_wakeup_device_prep - prepare wakeup devices |
| 23 | * @sleep_state: ACPI state |
| 24 | * Enable all wakup devices power if the devices' wakeup level |
| 25 | * is higher than requested sleep level |
| 26 | */ |
| 27 | |
| 28 | void |
| 29 | acpi_enable_wakeup_device_prep( |
| 30 | u8 sleep_state) |
| 31 | { |
| 32 | struct list_head * node, * next; |
| 33 | |
| 34 | ACPI_FUNCTION_TRACE("acpi_enable_wakeup_device_prep"); |
| 35 | |
| 36 | spin_lock(&acpi_device_lock); |
| 37 | list_for_each_safe(node, next, &acpi_wakeup_device_list) { |
| 38 | struct acpi_device * dev = container_of(node, |
| 39 | struct acpi_device, wakeup_list); |
| 40 | |
| 41 | if (!dev->wakeup.flags.valid || |
| 42 | !dev->wakeup.state.enabled || |
| 43 | (sleep_state > (u32) dev->wakeup.sleep_state)) |
| 44 | continue; |
| 45 | |
| 46 | spin_unlock(&acpi_device_lock); |
| 47 | acpi_enable_wakeup_device_power(dev); |
| 48 | spin_lock(&acpi_device_lock); |
| 49 | } |
| 50 | spin_unlock(&acpi_device_lock); |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * acpi_enable_wakeup_device - enable wakeup devices |
| 55 | * @sleep_state: ACPI state |
| 56 | * Enable all wakup devices's GPE |
| 57 | */ |
| 58 | void |
| 59 | acpi_enable_wakeup_device( |
| 60 | u8 sleep_state) |
| 61 | { |
| 62 | struct list_head * node, * next; |
| 63 | |
| 64 | /* |
| 65 | * Caution: this routine must be invoked when interrupt is disabled |
| 66 | * Refer ACPI2.0: P212 |
| 67 | */ |
| 68 | ACPI_FUNCTION_TRACE("acpi_enable_wakeup_device"); |
| 69 | spin_lock(&acpi_device_lock); |
| 70 | list_for_each_safe(node, next, &acpi_wakeup_device_list) { |
| 71 | struct acpi_device * dev = container_of(node, |
| 72 | struct acpi_device, wakeup_list); |
| 73 | |
| 74 | /* If users want to disable run-wake GPE, |
| 75 | * we only disable it for wake and leave it for runtime |
| 76 | */ |
| 77 | if (dev->wakeup.flags.run_wake && !dev->wakeup.state.enabled) { |
| 78 | spin_unlock(&acpi_device_lock); |
| 79 | acpi_set_gpe_type(dev->wakeup.gpe_device, |
| 80 | dev->wakeup.gpe_number, ACPI_GPE_TYPE_RUNTIME); |
| 81 | /* Re-enable it, since set_gpe_type will disable it */ |
| 82 | acpi_enable_gpe(dev->wakeup.gpe_device, |
| 83 | dev->wakeup.gpe_number, ACPI_ISR); |
| 84 | spin_lock(&acpi_device_lock); |
| 85 | continue; |
| 86 | } |
| 87 | |
| 88 | if (!dev->wakeup.flags.valid || |
| 89 | !dev->wakeup.state.enabled || |
| 90 | (sleep_state > (u32) dev->wakeup.sleep_state)) |
| 91 | continue; |
| 92 | |
| 93 | spin_unlock(&acpi_device_lock); |
| 94 | /* run-wake GPE has been enabled */ |
| 95 | if (!dev->wakeup.flags.run_wake) |
| 96 | acpi_enable_gpe(dev->wakeup.gpe_device, |
| 97 | dev->wakeup.gpe_number, ACPI_ISR); |
| 98 | dev->wakeup.state.active = 1; |
| 99 | spin_lock(&acpi_device_lock); |
| 100 | } |
| 101 | spin_unlock(&acpi_device_lock); |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * acpi_disable_wakeup_device - disable devices' wakeup capability |
| 106 | * @sleep_state: ACPI state |
| 107 | * Disable all wakup devices's GPE and wakeup capability |
| 108 | */ |
| 109 | void |
| 110 | acpi_disable_wakeup_device ( |
| 111 | u8 sleep_state) |
| 112 | { |
| 113 | struct list_head * node, * next; |
| 114 | |
| 115 | ACPI_FUNCTION_TRACE("acpi_disable_wakeup_device"); |
| 116 | |
| 117 | spin_lock(&acpi_device_lock); |
| 118 | list_for_each_safe(node, next, &acpi_wakeup_device_list) { |
| 119 | struct acpi_device * dev = container_of(node, |
| 120 | struct acpi_device, wakeup_list); |
| 121 | |
| 122 | if (dev->wakeup.flags.run_wake && !dev->wakeup.state.enabled) { |
| 123 | spin_unlock(&acpi_device_lock); |
| 124 | acpi_set_gpe_type(dev->wakeup.gpe_device, |
| 125 | dev->wakeup.gpe_number, ACPI_GPE_TYPE_WAKE_RUN); |
| 126 | /* Re-enable it, since set_gpe_type will disable it */ |
| 127 | acpi_enable_gpe(dev->wakeup.gpe_device, |
| 128 | dev->wakeup.gpe_number, ACPI_NOT_ISR); |
| 129 | spin_lock(&acpi_device_lock); |
| 130 | continue; |
| 131 | } |
| 132 | |
| 133 | if (!dev->wakeup.flags.valid || |
| 134 | !dev->wakeup.state.active || |
| 135 | (sleep_state > (u32) dev->wakeup.sleep_state)) |
| 136 | continue; |
| 137 | |
| 138 | spin_unlock(&acpi_device_lock); |
| 139 | acpi_disable_wakeup_device_power(dev); |
| 140 | /* Never disable run-wake GPE */ |
| 141 | if (!dev->wakeup.flags.run_wake) { |
| 142 | acpi_disable_gpe(dev->wakeup.gpe_device, |
| 143 | dev->wakeup.gpe_number, ACPI_NOT_ISR); |
| 144 | acpi_clear_gpe(dev->wakeup.gpe_device, |
| 145 | dev->wakeup.gpe_number, ACPI_NOT_ISR); |
| 146 | } |
| 147 | dev->wakeup.state.active = 0; |
| 148 | spin_lock(&acpi_device_lock); |
| 149 | } |
| 150 | spin_unlock(&acpi_device_lock); |
| 151 | } |
| 152 | |
| 153 | static int __init acpi_wakeup_device_init(void) |
| 154 | { |
| 155 | struct list_head * node, * next; |
| 156 | |
| 157 | if (acpi_disabled) |
| 158 | return 0; |
| 159 | printk("ACPI wakeup devices: \n"); |
| 160 | |
| 161 | spin_lock(&acpi_device_lock); |
| 162 | list_for_each_safe(node, next, &acpi_wakeup_device_list) { |
| 163 | struct acpi_device * dev = container_of(node, |
| 164 | struct acpi_device, wakeup_list); |
| 165 | |
| 166 | /* In case user doesn't load button driver */ |
| 167 | if (dev->wakeup.flags.run_wake && !dev->wakeup.state.enabled) { |
| 168 | spin_unlock(&acpi_device_lock); |
| 169 | acpi_set_gpe_type(dev->wakeup.gpe_device, |
| 170 | dev->wakeup.gpe_number, ACPI_GPE_TYPE_WAKE_RUN); |
| 171 | acpi_enable_gpe(dev->wakeup.gpe_device, |
| 172 | dev->wakeup.gpe_number, ACPI_NOT_ISR); |
| 173 | dev->wakeup.state.enabled = 1; |
| 174 | spin_lock(&acpi_device_lock); |
| 175 | } |
| 176 | printk("%4s ", dev->pnp.bus_id); |
| 177 | } |
| 178 | spin_unlock(&acpi_device_lock); |
| 179 | printk("\n"); |
| 180 | |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | late_initcall(acpi_wakeup_device_init); |
| 185 | #endif |
| 186 | |
| 187 | /* |
| 188 | * Disable all wakeup GPEs before power off. |
| 189 | * |
| 190 | * Since acpi_enter_sleep_state() will disable all |
| 191 | * RUNTIME GPEs, we simply mark all GPES that |
| 192 | * are not enabled for wakeup from S5 as RUNTIME. |
| 193 | */ |
| 194 | void acpi_wakeup_gpe_poweroff_prepare(void) |
| 195 | { |
| 196 | struct list_head * node, * next; |
| 197 | |
| 198 | list_for_each_safe(node, next, &acpi_wakeup_device_list) { |
| 199 | struct acpi_device * dev = container_of(node, |
| 200 | struct acpi_device, wakeup_list); |
| 201 | |
| 202 | /* The GPE can wakeup system from S5, don't touch it */ |
| 203 | if ((u32)dev->wakeup.sleep_state == ACPI_STATE_S5) |
| 204 | continue; |
| 205 | /* acpi_set_gpe_type will automatically disable GPE */ |
| 206 | acpi_set_gpe_type(dev->wakeup.gpe_device, |
| 207 | dev->wakeup.gpe_number, ACPI_GPE_TYPE_RUNTIME); |
| 208 | } |
| 209 | } |