drivers/acpi/sleep/wakeup.c

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