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 /**
  21  * acpi_enable_wakeup_device_prep - prepare wakeup devices
  22  *      @sleep_state:   ACPI state
  23  * Enable all wakup devices power if the devices' wakeup level
  24  * is higher than requested sleep level
  25  */
  26
  27 void acpi_enable_wakeup_device_prep(u8 sleep_state)
  28 {
  29         struct list_head *node, *next;
  30
  31         ACPI_FUNCTION_TRACE("acpi_enable_wakeup_device_prep");
  32
  33         spin_lock(&acpi_device_lock);
  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                 spin_unlock(&acpi_device_lock);
  45                 acpi_enable_wakeup_device_power(dev, sleep_state);
  46                 spin_lock(&acpi_device_lock);
  47         }
  48         spin_unlock(&acpi_device_lock);
  49 }
  50
  51 /**
  52  * acpi_enable_wakeup_device - enable wakeup devices
  53  *      @sleep_state:   ACPI state
  54  * Enable all wakup devices's GPE
  55  */
  56 void acpi_enable_wakeup_device(u8 sleep_state)
  57 {
  58         struct list_head *node, *next;
  59
  60         /*
  61          * Caution: this routine must be invoked when interrupt is disabled
  62          * Refer ACPI2.0: P212
  63          */
  64         ACPI_FUNCTION_TRACE("acpi_enable_wakeup_device");
  65         spin_lock(&acpi_device_lock);
  66         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
  67                 struct acpi_device *dev =
  68                         container_of(node, struct acpi_device, wakeup_list);
  69
  70                 if (!dev->wakeup.flags.valid)
  71                         continue;
  72
  73                 /* If users want to disable run-wake GPE,
  74                  * we only disable it for wake and leave it for runtime
  75                  */
  76                 if ((!dev->wakeup.state.enabled && !dev->wakeup.flags.prepared)
  77                     || sleep_state > (u32) dev->wakeup.sleep_state) {
  78                         if (dev->wakeup.flags.run_wake) {
  79                                 spin_unlock(&acpi_device_lock);
  80                                 /* set_gpe_type will disable GPE, leave it like that */
  81                                 acpi_set_gpe_type(dev->wakeup.gpe_device,
  82                                                   dev->wakeup.gpe_number,
  83                                                   ACPI_GPE_TYPE_RUNTIME);
  84                                 spin_lock(&acpi_device_lock);
  85                         }
  86                         continue;
  87                 }
  88                 spin_unlock(&acpi_device_lock);
  89                 if (!dev->wakeup.flags.run_wake)
  90                         acpi_enable_gpe(dev->wakeup.gpe_device,
  91                                         dev->wakeup.gpe_number, ACPI_ISR);
  92                 spin_lock(&acpi_device_lock);
  93         }
  94         spin_unlock(&acpi_device_lock);
  95 }
  96
  97 /**
  98  * acpi_disable_wakeup_device - disable devices' wakeup capability
  99  *      @sleep_state:   ACPI state
 100  * Disable all wakup devices's GPE and wakeup capability
 101  */
 102 void acpi_disable_wakeup_device(u8 sleep_state)
 103 {
 104         struct list_head *node, *next;
 105
 106         ACPI_FUNCTION_TRACE("acpi_disable_wakeup_device");
 107
 108         spin_lock(&acpi_device_lock);
 109         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 110                 struct acpi_device *dev =
 111                         container_of(node, struct acpi_device, wakeup_list);
 112
 113                 if (!dev->wakeup.flags.valid)
 114                         continue;
 115
 116                 if ((!dev->wakeup.state.enabled && !dev->wakeup.flags.prepared)
 117                     || sleep_state > (u32) dev->wakeup.sleep_state) {
 118                         if (dev->wakeup.flags.run_wake) {
 119                                 spin_unlock(&acpi_device_lock);
 120                                 acpi_set_gpe_type(dev->wakeup.gpe_device,
 121                                                   dev->wakeup.gpe_number,
 122                                                   ACPI_GPE_TYPE_WAKE_RUN);
 123                                 /* Re-enable it, since set_gpe_type will disable it */
 124                                 acpi_enable_gpe(dev->wakeup.gpe_device,
 125                                                 dev->wakeup.gpe_number, ACPI_NOT_ISR);
 126                                 spin_lock(&acpi_device_lock);
 127                         }
 128                         continue;
 129                 }
 130
 131                 spin_unlock(&acpi_device_lock);
 132                 acpi_disable_wakeup_device_power(dev);
 133                 /* Never disable run-wake GPE */
 134                 if (!dev->wakeup.flags.run_wake) {
 135                         acpi_disable_gpe(dev->wakeup.gpe_device,
 136                                          dev->wakeup.gpe_number, ACPI_NOT_ISR);
 137                         acpi_clear_gpe(dev->wakeup.gpe_device,
 138                                        dev->wakeup.gpe_number, ACPI_NOT_ISR);
 139                 }
 140                 spin_lock(&acpi_device_lock);
 141         }
 142         spin_unlock(&acpi_device_lock);
 143 }
 144
 145 static int __init acpi_wakeup_device_init(void)
 146 {
 147         struct list_head *node, *next;
 148
 149         if (acpi_disabled)
 150                 return 0;
 151
 152         spin_lock(&acpi_device_lock);
 153         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 154                 struct acpi_device *dev = container_of(node,
 155                                                        struct acpi_device,
 156                                                        wakeup_list);
 157                 /* In case user doesn't load button driver */
 158                 if (!dev->wakeup.flags.run_wake || dev->wakeup.state.enabled)
 159                         continue;
 160                 spin_unlock(&acpi_device_lock);
 161                 acpi_set_gpe_type(dev->wakeup.gpe_device,
 162                                   dev->wakeup.gpe_number,
 163                                   ACPI_GPE_TYPE_WAKE_RUN);
 164                 acpi_enable_gpe(dev->wakeup.gpe_device,
 165                                 dev->wakeup.gpe_number, ACPI_NOT_ISR);
 166                 dev->wakeup.state.enabled = 1;
 167                 spin_lock(&acpi_device_lock);
 168         }
 169         spin_unlock(&acpi_device_lock);
 170         return 0;
 171 }
 172
 173 late_initcall(acpi_wakeup_device_init);