drivers/acpi/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
  12 #include "internal.h"
  13 #include "sleep.h"
  14
  15 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  16 ACPI_MODULE_NAME("wakeup_devices")
  17
  18 extern struct list_head acpi_wakeup_device_list;
  19 extern spinlock_t acpi_device_lock;
  20
  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         spin_lock(&acpi_device_lock);
  33         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
  34                 struct acpi_device *dev = container_of(node,
  35                                                        struct acpi_device,
  36                                                        wakeup_list);
  37
  38                 if (!dev->wakeup.flags.valid ||
  39                     !dev->wakeup.state.enabled ||
  40                     (sleep_state > (u32) dev->wakeup.sleep_state))
  41                         continue;
  42
  43                 spin_unlock(&acpi_device_lock);
  44                 acpi_enable_wakeup_device_power(dev, sleep_state);
  45                 spin_lock(&acpi_device_lock);
  46         }
  47         spin_unlock(&acpi_device_lock);
  48 }
  49
  50 /**
  51  * acpi_enable_wakeup_device - enable wakeup devices
  52  *      @sleep_state:   ACPI state
  53  * Enable all wakup devices's GPE
  54  */
  55 void acpi_enable_wakeup_device(u8 sleep_state)
  56 {
  57         struct list_head *node, *next;
  58
  59         /*
  60          * Caution: this routine must be invoked when interrupt is disabled
  61          * Refer ACPI2.0: P212
  62          */
  63         spin_lock(&acpi_device_lock);
  64         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
  65                 struct acpi_device *dev =
  66                         container_of(node, struct acpi_device, wakeup_list);
  67
  68                 if (!dev->wakeup.flags.valid)
  69                         continue;
  70
  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 && !dev->wakeup.flags.prepared)
  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);
  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         spin_lock(&acpi_device_lock);
 105         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 106                 struct acpi_device *dev =
 107                         container_of(node, struct acpi_device, wakeup_list);
 108
 109                 if (!dev->wakeup.flags.valid)
 110                         continue;
 111
 112                 if ((!dev->wakeup.state.enabled && !dev->wakeup.flags.prepared)
 113                     || sleep_state > (u32) dev->wakeup.sleep_state) {
 114                         if (dev->wakeup.flags.run_wake) {
 115                                 spin_unlock(&acpi_device_lock);
 116                                 acpi_set_gpe_type(dev->wakeup.gpe_device,
 117                                                   dev->wakeup.gpe_number,
 118                                                   ACPI_GPE_TYPE_WAKE_RUN);
 119                                 /* Re-enable it, since set_gpe_type will disable it */
 120                                 acpi_enable_gpe(dev->wakeup.gpe_device,
 121                                                 dev->wakeup.gpe_number);
 122                                 spin_lock(&acpi_device_lock);
 123                         }
 124                         continue;
 125                 }
 126
 127                 spin_unlock(&acpi_device_lock);
 128                 acpi_disable_wakeup_device_power(dev);
 129                 /* Never disable run-wake GPE */
 130                 if (!dev->wakeup.flags.run_wake) {
 131                         acpi_disable_gpe(dev->wakeup.gpe_device,
 132                                          dev->wakeup.gpe_number);
 133                         acpi_clear_gpe(dev->wakeup.gpe_device,
 134                                        dev->wakeup.gpe_number, ACPI_NOT_ISR);
 135                 }
 136                 spin_lock(&acpi_device_lock);
 137         }
 138         spin_unlock(&acpi_device_lock);
 139 }
 140
 141 int __init acpi_wakeup_device_init(void)
 142 {
 143         struct list_head *node, *next;
 144
 145         spin_lock(&acpi_device_lock);
 146         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 147                 struct acpi_device *dev = container_of(node,
 148                                                        struct acpi_device,
 149                                                        wakeup_list);
 150                 /* In case user doesn't load button driver */
 151                 if (!dev->wakeup.flags.run_wake || dev->wakeup.state.enabled)
 152                         continue;
 153                 spin_unlock(&acpi_device_lock);
 154                 acpi_set_gpe_type(dev->wakeup.gpe_device,
 155                                   dev->wakeup.gpe_number,
 156                                   ACPI_GPE_TYPE_WAKE_RUN);
 157                 acpi_enable_gpe(dev->wakeup.gpe_device,
 158                                 dev->wakeup.gpe_number);
 159                 dev->wakeup.state.enabled = 1;
 160                 spin_lock(&acpi_device_lock);
 161         }
 162         spin_unlock(&acpi_device_lock);
 163         return 0;
 164 }