drivers/acpi/sleep/wakeup.c

   1 /*
   2  * wakeup.c - support wakeup devices
   3  */
   4
   5 #include <linux/init.h>
   6 #include <linux/acpi.h>
   7 #include <acpi/acpi_drivers.h>
   8 #include <linux/kernel.h>
   9 #include <linux/types.h>
  10 #include <acpi/acevents.h>
  11 #include "sleep.h"
  12
  13 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  14 ACPI_MODULE_NAME                ("wakeup_devices")
  15
  16 /**
  17  * acpi_enable_wakeup_device_prep - prepare wakeup devices
  18  *      @sleep_state:   ACPI state
  19  * Enable all wakup devices power if the devices' wakeup level
  20  * is higher than requested sleep level
  21  */
  22 extern struct list_head acpi_wakeup_device_list;
  23 extern spinlock_t acpi_device_lock;
  24
  25 void
  26 acpi_enable_wakeup_device_prep(
  27         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, 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);
  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
  56 acpi_enable_wakeup_device(
  57         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, wakeup_list);
  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.flags.run_wake && !dev->wakeup.state.enabled) {
  75                         spin_unlock(&acpi_device_lock);
  76                         acpi_set_gpe_type(dev->wakeup.gpe_device,
  77                                 dev->wakeup.gpe_number, ACPI_GPE_TYPE_RUNTIME);
  78                         /* Re-enable it, since set_gpe_type will disable it */
  79                         acpi_enable_gpe(dev->wakeup.gpe_device,
  80                                 dev->wakeup.gpe_number, ACPI_ISR);
  81                         spin_lock(&acpi_device_lock);
  82                         continue;
  83                 }
  84
  85                 if (!dev->wakeup.flags.valid ||
  86                         !dev->wakeup.state.enabled ||
  87                         (sleep_state > (u32) dev->wakeup.sleep_state))
  88                         continue;
  89
  90                 spin_unlock(&acpi_device_lock);
  91                 /* run-wake GPE has been enabled */
  92                 if (!dev->wakeup.flags.run_wake)
  93                         acpi_enable_gpe(dev->wakeup.gpe_device,
  94                                 dev->wakeup.gpe_number, ACPI_ISR);
  95                 dev->wakeup.state.active = 1;
  96                 spin_lock(&acpi_device_lock);
  97         }
  98         spin_unlock(&acpi_device_lock);
  99 }
 100
 101 /**
 102  * acpi_disable_wakeup_device - disable devices' wakeup capability
 103  *      @sleep_state:   ACPI state
 104  * Disable all wakup devices's GPE and wakeup capability
 105  */
 106 void
 107 acpi_disable_wakeup_device (
 108         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, wakeup_list);
 118
 119                 if (dev->wakeup.flags.run_wake && !dev->wakeup.state.enabled) {
 120                         spin_unlock(&acpi_device_lock);
 121                         acpi_set_gpe_type(dev->wakeup.gpe_device,
 122                                 dev->wakeup.gpe_number, 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                         continue;
 128                 }
 129
 130                 if (!dev->wakeup.flags.valid ||
 131                         !dev->wakeup.state.active ||
 132                         (sleep_state > (u32) dev->wakeup.sleep_state))
 133                         continue;
 134
 135                 spin_unlock(&acpi_device_lock);
 136                 acpi_disable_wakeup_device_power(dev);
 137                 /* Never disable run-wake GPE */
 138                 if (!dev->wakeup.flags.run_wake) {
 139                         acpi_disable_gpe(dev->wakeup.gpe_device,
 140                                 dev->wakeup.gpe_number, ACPI_NOT_ISR);
 141                         acpi_clear_gpe(dev->wakeup.gpe_device,
 142                                 dev->wakeup.gpe_number, ACPI_NOT_ISR);
 143                 }
 144                 dev->wakeup.state.active = 0;
 145                 spin_lock(&acpi_device_lock);
 146         }
 147         spin_unlock(&acpi_device_lock);
 148 }
 149
 150 static int __init acpi_wakeup_device_init(void)
 151 {
 152         struct list_head * node, * next;
 153
 154         if (acpi_disabled)
 155                 return 0;
 156         printk("ACPI wakeup devices: \n");
 157
 158         spin_lock(&acpi_device_lock);
 159         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 160                 struct acpi_device * dev = container_of(node,
 161                         struct acpi_device, wakeup_list);
 162
 163                 /* In case user doesn't load button driver */
 164                 if (dev->wakeup.flags.run_wake && !dev->wakeup.state.enabled) {
 165                         spin_unlock(&acpi_device_lock);
 166                         acpi_set_gpe_type(dev->wakeup.gpe_device,
 167                                 dev->wakeup.gpe_number, ACPI_GPE_TYPE_WAKE_RUN);
 168                         acpi_enable_gpe(dev->wakeup.gpe_device,
 169                                 dev->wakeup.gpe_number, ACPI_NOT_ISR);
 170                         dev->wakeup.state.enabled = 1;
 171                         spin_lock(&acpi_device_lock);
 172                 }
 173                 printk("%4s ", dev->pnp.bus_id);
 174         }
 175         spin_unlock(&acpi_device_lock);
 176         printk("\n");
 177
 178         return 0;
 179 }
 180
 181 late_initcall(acpi_wakeup_device_init);