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_devices - Enable wake-up device GPEs.
25 * @sleep_state: ACPI system sleep state.
27 * Enable wakeup device power of devices with the state.enable flag set and set
28 * the wakeup enable mask bits in the GPE registers that correspond to wakeup
31 void acpi_enable_wakeup_devices(u8 sleep_state
)
33 struct list_head
*node
, *next
;
35 list_for_each_safe(node
, next
, &acpi_wakeup_device_list
) {
36 struct acpi_device
*dev
=
37 container_of(node
, struct acpi_device
, wakeup_list
);
39 if (!dev
->wakeup
.flags
.valid
40 || sleep_state
> (u32
) dev
->wakeup
.sleep_state
41 || !(device_may_wakeup(&dev
->dev
)
42 || dev
->wakeup
.prepare_count
))
45 if (device_may_wakeup(&dev
->dev
))
46 acpi_enable_wakeup_device_power(dev
, sleep_state
);
48 /* The wake-up power should have been enabled already. */
49 acpi_set_gpe_wake_mask(dev
->wakeup
.gpe_device
, dev
->wakeup
.gpe_number
,
55 * acpi_disable_wakeup_devices - Disable devices' wakeup capability.
56 * @sleep_state: ACPI system sleep state.
58 void acpi_disable_wakeup_devices(u8 sleep_state
)
60 struct list_head
*node
, *next
;
62 list_for_each_safe(node
, next
, &acpi_wakeup_device_list
) {
63 struct acpi_device
*dev
=
64 container_of(node
, struct acpi_device
, wakeup_list
);
66 if (!dev
->wakeup
.flags
.valid
67 || sleep_state
> (u32
) dev
->wakeup
.sleep_state
68 || !(device_may_wakeup(&dev
->dev
)
69 || dev
->wakeup
.prepare_count
))
72 acpi_set_gpe_wake_mask(dev
->wakeup
.gpe_device
, dev
->wakeup
.gpe_number
,
75 if (device_may_wakeup(&dev
->dev
))
76 acpi_disable_wakeup_device_power(dev
);
80 int __init
acpi_wakeup_device_init(void)
82 struct list_head
*node
, *next
;
84 mutex_lock(&acpi_device_lock
);
85 list_for_each_safe(node
, next
, &acpi_wakeup_device_list
) {
86 struct acpi_device
*dev
= container_of(node
,
89 if (device_can_wakeup(&dev
->dev
)) {
90 /* Button GPEs are supposed to be always enabled. */
91 acpi_enable_gpe(dev
->wakeup
.gpe_device
,
92 dev
->wakeup
.gpe_number
);
93 device_set_wakeup_enable(&dev
->dev
, true);
96 mutex_unlock(&acpi_device_lock
);
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