210 lines
5.8 KiB
C
210 lines
5.8 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 <acpi/acevents.h>
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#include "sleep.h"
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#define _COMPONENT ACPI_SYSTEM_COMPONENT
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ACPI_MODULE_NAME("wakeup_devices")
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extern struct list_head acpi_wakeup_device_list;
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extern spinlock_t acpi_device_lock;
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#ifdef CONFIG_ACPI_SLEEP
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/**
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* acpi_enable_wakeup_device_prep - prepare wakeup devices
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* @sleep_state: ACPI state
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* Enable all wakup devices power if the devices' wakeup level
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* is higher than requested sleep level
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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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ACPI_FUNCTION_TRACE("acpi_enable_wakeup_device_prep");
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spin_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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if (!dev->wakeup.flags.valid ||
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!dev->wakeup.state.enabled ||
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(sleep_state > (u32) dev->wakeup.sleep_state))
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continue;
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spin_unlock(&acpi_device_lock);
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acpi_enable_wakeup_device_power(dev);
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spin_lock(&acpi_device_lock);
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}
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spin_unlock(&acpi_device_lock);
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}
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/**
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* acpi_enable_wakeup_device - enable wakeup devices
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* @sleep_state: ACPI state
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* Enable all wakup devices's GPE
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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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ACPI_FUNCTION_TRACE("acpi_enable_wakeup_device");
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spin_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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/* If users want to disable run-wake GPE,
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* we only disable it for wake and leave it for runtime
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*/
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if (dev->wakeup.flags.run_wake && !dev->wakeup.state.enabled) {
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spin_unlock(&acpi_device_lock);
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acpi_set_gpe_type(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number,
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ACPI_GPE_TYPE_RUNTIME);
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/* Re-enable it, since set_gpe_type will disable it */
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acpi_enable_gpe(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number, ACPI_ISR);
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spin_lock(&acpi_device_lock);
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continue;
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}
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if (!dev->wakeup.flags.valid ||
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!dev->wakeup.state.enabled ||
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(sleep_state > (u32) dev->wakeup.sleep_state))
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continue;
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spin_unlock(&acpi_device_lock);
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/* run-wake GPE has been enabled */
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if (!dev->wakeup.flags.run_wake)
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acpi_enable_gpe(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number, ACPI_ISR);
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dev->wakeup.state.active = 1;
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spin_lock(&acpi_device_lock);
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}
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spin_unlock(&acpi_device_lock);
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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 state
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* Disable all wakup devices's GPE and wakeup capability
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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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ACPI_FUNCTION_TRACE("acpi_disable_wakeup_device");
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spin_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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if (dev->wakeup.flags.run_wake && !dev->wakeup.state.enabled) {
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spin_unlock(&acpi_device_lock);
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acpi_set_gpe_type(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number,
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ACPI_GPE_TYPE_WAKE_RUN);
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/* Re-enable it, since set_gpe_type will disable it */
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acpi_enable_gpe(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number, ACPI_NOT_ISR);
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spin_lock(&acpi_device_lock);
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continue;
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}
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if (!dev->wakeup.flags.valid ||
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!dev->wakeup.state.active ||
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(sleep_state > (u32) dev->wakeup.sleep_state))
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continue;
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spin_unlock(&acpi_device_lock);
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acpi_disable_wakeup_device_power(dev);
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/* Never disable run-wake GPE */
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if (!dev->wakeup.flags.run_wake) {
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acpi_disable_gpe(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number, ACPI_NOT_ISR);
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acpi_clear_gpe(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number, ACPI_NOT_ISR);
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}
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dev->wakeup.state.active = 0;
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spin_lock(&acpi_device_lock);
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}
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spin_unlock(&acpi_device_lock);
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}
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static int __init acpi_wakeup_device_init(void)
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{
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struct list_head *node, *next;
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if (acpi_disabled)
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return 0;
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spin_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.run_wake && !dev->wakeup.state.enabled) {
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spin_unlock(&acpi_device_lock);
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acpi_set_gpe_type(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number,
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ACPI_GPE_TYPE_WAKE_RUN);
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acpi_enable_gpe(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number, ACPI_NOT_ISR);
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dev->wakeup.state.enabled = 1;
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spin_lock(&acpi_device_lock);
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}
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}
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spin_unlock(&acpi_device_lock);
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return 0;
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}
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late_initcall(acpi_wakeup_device_init);
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#endif
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/*
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* Disable all wakeup GPEs before entering requested sleep state.
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* @sleep_state: ACPI state
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* Since acpi_enter_sleep_state() will disable all
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* RUNTIME GPEs, we simply mark all GPES that
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* are not enabled for wakeup from requested state as RUNTIME.
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*/
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void acpi_gpe_sleep_prepare(u32 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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/* The GPE can wakeup system from this state, don't touch it */
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if ((u32) dev->wakeup.sleep_state >= sleep_state)
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continue;
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/* acpi_set_gpe_type will automatically disable GPE */
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acpi_set_gpe_type(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number,
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ACPI_GPE_TYPE_RUNTIME);
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}
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}
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