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 /*
  16  * We didn't lock acpi_device_lock in the file, because it invokes oops in
  17  * suspend/resume and isn't really required as this is called in S-state. At
  18  * that time, there is no device hotplug
  19  **/
  20 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  21 ACPI_MODULE_NAME("wakeup_devices")
  22
  23 /**
  24  * acpi_enable_wakeup_device_prep - prepare wakeup devices
  25  *      @sleep_state:   ACPI state
  26  * Enable all wakup devices power if the devices' wakeup level
  27  * is higher than requested sleep level
  28  */
  29
  30 void acpi_enable_wakeup_device_prep(u8 sleep_state)
  31 {
  32         struct list_head *node, *next;
  33
  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                 acpi_enable_wakeup_device_power(dev, sleep_state);
  45         }
  46 }
  47
  48 /**
  49  * acpi_enable_wakeup_device - enable wakeup devices
  50  *      @sleep_state:   ACPI state
  51  * Enable all wakup devices's GPE
  52  */
  53 void acpi_enable_wakeup_device(u8 sleep_state)
  54 {
  55         struct list_head *node, *next;
  56
  57         /*
  58          * Caution: this routine must be invoked when interrupt is disabled
  59          * Refer ACPI2.0: P212
  60          */
  61         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
  62                 struct acpi_device *dev =
  63                         container_of(node, struct acpi_device, wakeup_list);
  64
  65                 if (!dev->wakeup.flags.valid)
  66                         continue;
  67
  68                 /* If users want to disable run-wake GPE,
  69                  * we only disable it for wake and leave it for runtime
  70                  */
  71                 if ((!dev->wakeup.state.enabled && !dev->wakeup.prepare_count)
  72                     || sleep_state > (u32) dev->wakeup.sleep_state) {
  73                         if (dev->wakeup.flags.run_wake) {
  74                                 /* set_gpe_type will disable GPE, leave it like that */
  75                                 acpi_set_gpe_type(dev->wakeup.gpe_device,
  76                                                   dev->wakeup.gpe_number,
  77                                                   ACPI_GPE_TYPE_RUNTIME);
  78                         }
  79                         continue;
  80                 }
  81                 if (!dev->wakeup.flags.run_wake)
  82                         acpi_enable_gpe(dev->wakeup.gpe_device,
  83                                         dev->wakeup.gpe_number);
  84         }
  85 }
  86
  87 /**
  88  * acpi_disable_wakeup_device - disable devices' wakeup capability
  89  *      @sleep_state:   ACPI state
  90  * Disable all wakup devices's GPE and wakeup capability
  91  */
  92 void acpi_disable_wakeup_device(u8 sleep_state)
  93 {
  94         struct list_head *node, *next;
  95
  96         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
  97                 struct acpi_device *dev =
  98                         container_of(node, struct acpi_device, wakeup_list);
  99
 100                 if (!dev->wakeup.flags.valid)
 101                         continue;
 102
 103                 if ((!dev->wakeup.state.enabled && !dev->wakeup.prepare_count)
 104                     || sleep_state > (u32) dev->wakeup.sleep_state) {
 105                         if (dev->wakeup.flags.run_wake) {
 106                                 acpi_set_gpe_type(dev->wakeup.gpe_device,
 107                                                   dev->wakeup.gpe_number,
 108                                                   ACPI_GPE_TYPE_WAKE_RUN);
 109                                 /* Re-enable it, since set_gpe_type will disable it */
 110                                 acpi_enable_gpe(dev->wakeup.gpe_device,
 111                                                 dev->wakeup.gpe_number);
 112                         }
 113                         continue;
 114                 }
 115
 116                 acpi_disable_wakeup_device_power(dev);
 117                 /* Never disable run-wake GPE */
 118                 if (!dev->wakeup.flags.run_wake) {
 119                         acpi_disable_gpe(dev->wakeup.gpe_device,
 120                                          dev->wakeup.gpe_number);
 121                         acpi_clear_gpe(dev->wakeup.gpe_device,
 122                                        dev->wakeup.gpe_number, ACPI_NOT_ISR);
 123                 }
 124         }
 125 }
 126
 127 int __init acpi_wakeup_device_init(void)
 128 {
 129         struct list_head *node, *next;
 130
 131         mutex_lock(&acpi_device_lock);
 132         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
 133                 struct acpi_device *dev = container_of(node,
 134                                                        struct acpi_device,
 135                                                        wakeup_list);
 136                 /* In case user doesn't load button driver */
 137                 if (!dev->wakeup.flags.run_wake || dev->wakeup.state.enabled)
 138                         continue;
 139                 acpi_set_gpe_type(dev->wakeup.gpe_device,
 140                                   dev->wakeup.gpe_number,
 141                                   ACPI_GPE_TYPE_WAKE_RUN);
 142                 acpi_enable_gpe(dev->wakeup.gpe_device,
 143                                 dev->wakeup.gpe_number);
 144                 dev->wakeup.state.enabled = 1;
 145         }
 146         mutex_unlock(&acpi_device_lock);
 147         return 0;
 148 }