2 * wakeup.c - support wakeup devices
3 * Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com>
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>
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
20 #define _COMPONENT ACPI_SYSTEM_COMPONENT
21 ACPI_MODULE_NAME("wakeup_devices")
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
30 void acpi_enable_wakeup_device_prep(u8 sleep_state)
32 struct list_head *node, *next;
34 list_for_each_safe(node, next, &acpi_wakeup_device_list) {
35 struct acpi_device *dev = container_of(node,
39 if (!dev->wakeup.flags.valid ||
40 !dev->wakeup.state.enabled ||
41 (sleep_state > (u32) dev->wakeup.sleep_state))
44 acpi_enable_wakeup_device_power(dev, sleep_state);
49 * acpi_enable_wakeup_device - enable wakeup devices
50 * @sleep_state: ACPI state
51 * Enable all wakup devices's GPE
53 void acpi_enable_wakeup_device(u8 sleep_state)
55 struct list_head *node, *next;
58 * Caution: this routine must be invoked when interrupt is disabled
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);
65 if (!dev->wakeup.flags.valid)
68 /* If users want to disable run-wake GPE,
69 * we only disable it for wake and leave it for runtime
71 if ((!dev->wakeup.state.enabled && !dev->wakeup.flags.prepared)
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);
81 if (!dev->wakeup.flags.run_wake)
82 acpi_enable_gpe(dev->wakeup.gpe_device,
83 dev->wakeup.gpe_number);
88 * acpi_disable_wakeup_device - disable devices' wakeup capability
89 * @sleep_state: ACPI state
90 * Disable all wakup devices's GPE and wakeup capability
92 void acpi_disable_wakeup_device(u8 sleep_state)
94 struct list_head *node, *next;
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);
100 if (!dev->wakeup.flags.valid)
103 if ((!dev->wakeup.state.enabled && !dev->wakeup.flags.prepared)
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);
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);
127 int __init acpi_wakeup_device_init(void)
129 struct list_head *node, *next;
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,
136 /* In case user doesn't load button driver */
137 if (!dev->wakeup.flags.run_wake || dev->wakeup.state.enabled)
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;
146 mutex_unlock(&acpi_device_lock);