123 строки
3.3 KiB
C
123 строки
3.3 KiB
C
/*
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* wakeup.c - support wakeup devices
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* Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com>
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*/
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_drivers.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include "internal.h"
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#include "sleep.h"
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/*
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* We didn't lock acpi_device_lock in the file, because it invokes oops in
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* suspend/resume and isn't really required as this is called in S-state. At
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* that time, there is no device hotplug
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**/
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#define _COMPONENT ACPI_SYSTEM_COMPONENT
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ACPI_MODULE_NAME("wakeup_devices")
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/**
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* acpi_enable_wakeup_device_prep - Prepare wake-up devices.
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* @sleep_state: ACPI system sleep state.
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*
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* Enable all wake-up devices' power, unless the requested system sleep state is
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* too deep.
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*/
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void acpi_enable_wakeup_device_prep(u8 sleep_state)
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{
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struct list_head *node, *next;
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list_for_each_safe(node, next, &acpi_wakeup_device_list) {
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struct acpi_device *dev = container_of(node,
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struct acpi_device,
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wakeup_list);
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if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled
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|| (sleep_state > (u32) dev->wakeup.sleep_state))
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continue;
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acpi_enable_wakeup_device_power(dev, sleep_state);
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}
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}
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/**
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* acpi_enable_wakeup_device - Enable wake-up device GPEs.
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* @sleep_state: ACPI system sleep state.
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*
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* Enable all wake-up devices' GPEs, with the assumption that
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* acpi_disable_all_gpes() was executed before, so we don't need to disable any
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* GPEs here.
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*/
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void acpi_enable_wakeup_device(u8 sleep_state)
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{
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struct list_head *node, *next;
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/*
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* Caution: this routine must be invoked when interrupt is disabled
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* Refer ACPI2.0: P212
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*/
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list_for_each_safe(node, next, &acpi_wakeup_device_list) {
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struct acpi_device *dev =
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container_of(node, struct acpi_device, wakeup_list);
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if (!dev->wakeup.flags.valid)
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continue;
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if ((!dev->wakeup.state.enabled && !dev->wakeup.prepare_count)
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|| sleep_state > (u32) dev->wakeup.sleep_state)
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continue;
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/* The wake-up power should have been enabled already. */
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acpi_set_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
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ACPI_GPE_ENABLE);
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}
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}
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/**
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* acpi_disable_wakeup_device - Disable devices' wakeup capability.
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* @sleep_state: ACPI system sleep state.
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*
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* This function only affects devices with wakeup.state.enabled set, which means
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* that it reverses the changes made by acpi_enable_wakeup_device_prep().
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*/
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void acpi_disable_wakeup_device(u8 sleep_state)
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{
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struct list_head *node, *next;
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list_for_each_safe(node, next, &acpi_wakeup_device_list) {
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struct acpi_device *dev =
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container_of(node, struct acpi_device, wakeup_list);
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if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled
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|| (sleep_state > (u32) dev->wakeup.sleep_state))
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continue;
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acpi_disable_wakeup_device_power(dev);
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}
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}
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int __init acpi_wakeup_device_init(void)
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{
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struct list_head *node, *next;
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mutex_lock(&acpi_device_lock);
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list_for_each_safe(node, next, &acpi_wakeup_device_list) {
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struct acpi_device *dev = container_of(node,
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struct acpi_device,
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wakeup_list);
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/* In case user doesn't load button driver */
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if (!dev->wakeup.flags.always_enabled ||
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dev->wakeup.state.enabled)
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continue;
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acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
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ACPI_GPE_TYPE_WAKE);
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dev->wakeup.state.enabled = 1;
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}
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mutex_unlock(&acpi_device_lock);
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return 0;
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}
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