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ACPI GPEs may map to multiple devices. The current GPE interface only provides a mechanism for enabling and disabling GPEs, making it difficult to change the state of GPEs at runtime without extensive cooperation between devices. Add an API to allow devices to indicate whether or not they want their device's GPE to be enabled for both runtime and wakeup events. Remove the old GPE type handling entirely, which gets rid of various quirks, like the implicit disabling with GPE type setting. This requires a small amount of rework in order to ensure that non-wake GPEs are enabled by default to preserve existing behaviour. Based on patches from Matthew Garrett <mjg@redhat.com>. Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
122 lines
3.3 KiB
C
122 lines
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.run_wake || 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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