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drivers/acpi/wakeup.c
2.65 KB
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/* * wakeup.c - support wakeup devices * Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com> */ #include <linux/init.h> #include <linux/acpi.h> |
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#include <linux/kernel.h> #include <linux/types.h> |
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#include "internal.h" |
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#include "sleep.h" |
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/* * We didn't lock acpi_device_lock in the file, because it invokes oops in * suspend/resume and isn't really required as this is called in S-state. At * that time, there is no device hotplug **/ |
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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_devices - Enable wake-up device GPEs. |
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* @sleep_state: ACPI system sleep state. * |
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* Enable wakeup device power of devices with the state.enable flag set and set * the wakeup enable mask bits in the GPE registers that correspond to wakeup * devices. |
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*/ |
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void acpi_enable_wakeup_devices(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, struct acpi_device, wakeup_list); |
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if (!dev->wakeup.flags.valid |
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|| sleep_state > (u32) dev->wakeup.sleep_state || !(device_may_wakeup(&dev->dev) || dev->wakeup.prepare_count)) |
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continue; |
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if (device_may_wakeup(&dev->dev)) |
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acpi_enable_wakeup_device_power(dev, sleep_state); |
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/* The wake-up power should have been enabled already. */ |
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acpi_set_gpe_wake_mask(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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* acpi_disable_wakeup_devices - Disable devices' wakeup capability. |
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* @sleep_state: ACPI system sleep state. |
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*/ |
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void acpi_disable_wakeup_devices(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, struct acpi_device, wakeup_list); |
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if (!dev->wakeup.flags.valid |
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|| sleep_state > (u32) dev->wakeup.sleep_state || !(device_may_wakeup(&dev->dev) || dev->wakeup.prepare_count)) |
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continue; |
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acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number, |
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ACPI_GPE_DISABLE); |
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if (device_may_wakeup(&dev->dev)) |
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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, struct acpi_device, wakeup_list); |
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if (device_can_wakeup(&dev->dev)) { /* Button GPEs are supposed to be always enabled. */ acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number); |
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device_set_wakeup_enable(&dev->dev, true); |
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} |
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} |
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mutex_unlock(&acpi_device_lock); |
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return 0; } |