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);
  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                 if (!dev->wakeup.flags.valid)
  70                         continue;
  71                 /* If users want to disable run-wake GPE,
  72                  * we only disable it for wake and leave it for runtime
  73                  */
  74                 if (!dev->wakeup.state.enabled ||
  75                     sleep_state > (u32) dev->wakeup.sleep_state) {
  76                         if (dev->wakeup.flags.run_wake) {
  77                                 spin_unlock(&acpi_device_lock);
  78                                 /* set_gpe_type will disable GPE, leave it like that */
  79                                 acpi_set_gpe_type(dev->wakeup.gpe_device,
  80                                                   dev->wakeup.gpe_number,
  81                                                   ACPI_GPE_TYPE_RUNTIME);
  82                                 spin_lock(&acpi_device_lock);
  83                         }
  84                         continue;
  85                 }
  86                 spin_unlock(&acpi_device_lock);
  87                 if (!dev->wakeup.flags.run_wake)
  88                         acpi_enable_gpe(dev->wakeup.gpe_device,
  89                                         dev->wakeup.gpe_number, ACPI_ISR);
  90                 spin_lock(&acpi_device_lock);
  91         }
  92         spin_unlock(&acpi_device_lock);
  93 }
  94
  95 /**
  96  * acpi_disable_wakeup_device - disable devices' wakeup capability
  97  *      @sleep_state:   ACPI state
  98  * Disable all wakup devices's GPE and wakeup capability
  99  */
 100 void acpi_disable_wakeup_device(u8 sleep_state)
 101 {
 102         struct list_head *node, *next;
 103
 104         ACPI_FUNCTION_TRACE("acpi_disable_wakeup_device");
 105
 106         spin_lock(&acpi_device_lock);
 107         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 108                 struct acpi_device *dev =
 109                         container_of(node, struct acpi_device, wakeup_list);
 110
 111                 if (!dev->wakeup.flags.valid)
 112                         continue;
 113                 if (!dev->wakeup.state.enabled ||
 114                     sleep_state > (u32) dev->wakeup.sleep_state) {
 115                         if (dev->wakeup.flags.run_wake) {
 116                                 spin_unlock(&acpi_device_lock);
 117                                 acpi_set_gpe_type(dev->wakeup.gpe_device,
 118                                                   dev->wakeup.gpe_number,
 119                                                   ACPI_GPE_TYPE_WAKE_RUN);
 120                                 /* Re-enable it, since set_gpe_type will disable it */
 121                                 acpi_enable_gpe(dev->wakeup.gpe_device,
 122                                                 dev->wakeup.gpe_number, ACPI_NOT_ISR);
 123                                 spin_lock(&acpi_device_lock);
 124                         }
 125                         continue;
 126                 }
 127
 128                 spin_unlock(&acpi_device_lock);
 129                 acpi_disable_wakeup_device_power(dev);
 130                 /* Never disable run-wake GPE */
 131                 if (!dev->wakeup.flags.run_wake) {
 132                         acpi_disable_gpe(dev->wakeup.gpe_device,
 133                                          dev->wakeup.gpe_number, ACPI_NOT_ISR);
 134                         acpi_clear_gpe(dev->wakeup.gpe_device,
 135                                        dev->wakeup.gpe_number, ACPI_NOT_ISR);
 136                 }
 137                 spin_lock(&acpi_device_lock);
 138         }
 139         spin_unlock(&acpi_device_lock);
 140 }
 141
 142 static int __init acpi_wakeup_device_init(void)
 143 {
 144         struct list_head *node, *next;
 145
 146         if (acpi_disabled)
 147                 return 0;
 148
 149         spin_lock(&acpi_device_lock);
 150         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 151                 struct acpi_device *dev = container_of(node,
 152                                                        struct acpi_device,
 153                                                        wakeup_list);
 154                 /* In case user doesn't load button driver */
 155                 if (!dev->wakeup.flags.run_wake || dev->wakeup.state.enabled)
 156                         continue;
 157                 spin_unlock(&acpi_device_lock);
 158                 acpi_set_gpe_type(dev->wakeup.gpe_device,
 159                                   dev->wakeup.gpe_number,
 160                                   ACPI_GPE_TYPE_WAKE_RUN);
 161                 acpi_enable_gpe(dev->wakeup.gpe_device,
 162                                 dev->wakeup.gpe_number, ACPI_NOT_ISR);
 163                 dev->wakeup.state.enabled = 1;
 164                 spin_lock(&acpi_device_lock);
 165         }
 166         spin_unlock(&acpi_device_lock);
 167         return 0;
 168 }
 169
 170 late_initcall(acpi_wakeup_device_init);