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5989329894
* acpi-scan: (30 commits) ACPI / scan: Fix acpi_bus_get_device() check in acpi_match_device() ACPI / scan: Make namespace scanning and trimming mutually exclusive ACPI / scan: Make it clear that acpi_bus_trim() cannot fail ACPI / scan: Drop acpi_bus_add() and use acpi_bus_scan() instead ACPI: update ej_event interface to take acpi_device ACPI / scan: Add second pass to acpi_bus_trim() ACPI / scan: Change the implementation of acpi_bus_trim() ACPI / scan: Drop the second argument of acpi_bus_trim() ACPI / scan: Drop the second argument of acpi_device_unregister() ACPI: Remove the ops field from struct acpi_device ACPI: remove unused acpi_op_bind and acpi_op_unbind ACPI / scan: Fix check of device_attach() return value. ACPI / scan: Treat power resources in a special way ACPI: Remove unused struct acpi_pci_root.id member ACPI: Drop ACPI device .bind() and .unbind() callbacks ACPI / PCI: Move the _PRT setup and cleanup code to pci-acpi.c ACPI / PCI: Rework the setup and cleanup of device wakeup ACPI: Add .setup() and .cleanup() callbacks to struct acpi_bus_type ACPI: Make acpi_bus_scan() and acpi_bus_add() take only one argument ACPI: Replace ACPI device add_type field with a match_driver flag ...
1017 lines
29 KiB
C
1017 lines
29 KiB
C
/*
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* drivers/acpi/device_pm.c - ACPI device power management routines.
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*
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* Copyright (C) 2012, Intel Corp.
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* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/device.h>
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#include <linux/export.h>
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#include <linux/mutex.h>
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#include <linux/pm_qos.h>
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#include <linux/pm_runtime.h>
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#include <acpi/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include "internal.h"
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#define _COMPONENT ACPI_POWER_COMPONENT
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ACPI_MODULE_NAME("device_pm");
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static DEFINE_MUTEX(acpi_pm_notifier_lock);
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/**
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* acpi_add_pm_notifier - Register PM notifier for given ACPI device.
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* @adev: ACPI device to add the notifier for.
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* @context: Context information to pass to the notifier routine.
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*
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* NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
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* PM wakeup events. For example, wakeup events may be generated for bridges
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* if one of the devices below the bridge is signaling wakeup, even if the
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* bridge itself doesn't have a wakeup GPE associated with it.
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*/
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acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
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acpi_notify_handler handler, void *context)
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{
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acpi_status status = AE_ALREADY_EXISTS;
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mutex_lock(&acpi_pm_notifier_lock);
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if (adev->wakeup.flags.notifier_present)
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goto out;
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status = acpi_install_notify_handler(adev->handle,
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ACPI_SYSTEM_NOTIFY,
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handler, context);
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if (ACPI_FAILURE(status))
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goto out;
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adev->wakeup.flags.notifier_present = true;
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out:
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mutex_unlock(&acpi_pm_notifier_lock);
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return status;
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}
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/**
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* acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
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* @adev: ACPI device to remove the notifier from.
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*/
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acpi_status acpi_remove_pm_notifier(struct acpi_device *adev,
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acpi_notify_handler handler)
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{
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acpi_status status = AE_BAD_PARAMETER;
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mutex_lock(&acpi_pm_notifier_lock);
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if (!adev->wakeup.flags.notifier_present)
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goto out;
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status = acpi_remove_notify_handler(adev->handle,
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ACPI_SYSTEM_NOTIFY,
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handler);
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if (ACPI_FAILURE(status))
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goto out;
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adev->wakeup.flags.notifier_present = false;
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out:
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mutex_unlock(&acpi_pm_notifier_lock);
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return status;
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}
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/**
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* acpi_power_state_string - String representation of ACPI device power state.
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* @state: ACPI device power state to return the string representation of.
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*/
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const char *acpi_power_state_string(int state)
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{
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switch (state) {
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case ACPI_STATE_D0:
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return "D0";
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case ACPI_STATE_D1:
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return "D1";
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case ACPI_STATE_D2:
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return "D2";
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case ACPI_STATE_D3_HOT:
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return "D3hot";
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case ACPI_STATE_D3_COLD:
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return "D3cold";
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default:
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return "(unknown)";
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}
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}
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/**
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* acpi_device_get_power - Get power state of an ACPI device.
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* @device: Device to get the power state of.
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* @state: Place to store the power state of the device.
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*
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* This function does not update the device's power.state field, but it may
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* update its parent's power.state field (when the parent's power state is
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* unknown and the device's power state turns out to be D0).
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*/
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int acpi_device_get_power(struct acpi_device *device, int *state)
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{
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int result = ACPI_STATE_UNKNOWN;
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if (!device || !state)
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return -EINVAL;
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if (!device->flags.power_manageable) {
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/* TBD: Non-recursive algorithm for walking up hierarchy. */
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*state = device->parent ?
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device->parent->power.state : ACPI_STATE_D0;
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goto out;
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}
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/*
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* Get the device's power state either directly (via _PSC) or
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* indirectly (via power resources).
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*/
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if (device->power.flags.explicit_get) {
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unsigned long long psc;
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acpi_status status = acpi_evaluate_integer(device->handle,
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"_PSC", NULL, &psc);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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result = psc;
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}
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/* The test below covers ACPI_STATE_UNKNOWN too. */
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if (result <= ACPI_STATE_D2) {
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; /* Do nothing. */
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} else if (device->power.flags.power_resources) {
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int error = acpi_power_get_inferred_state(device, &result);
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if (error)
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return error;
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} else if (result == ACPI_STATE_D3_HOT) {
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result = ACPI_STATE_D3;
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}
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/*
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* If we were unsure about the device parent's power state up to this
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* point, the fact that the device is in D0 implies that the parent has
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* to be in D0 too.
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*/
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if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
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&& result == ACPI_STATE_D0)
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device->parent->power.state = ACPI_STATE_D0;
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*state = result;
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out:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
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device->pnp.bus_id, acpi_power_state_string(*state)));
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return 0;
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}
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static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state)
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{
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if (adev->power.states[state].flags.explicit_set) {
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char method[5] = { '_', 'P', 'S', '0' + state, '\0' };
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acpi_status status;
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status = acpi_evaluate_object(adev->handle, method, NULL, NULL);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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}
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return 0;
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}
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/**
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* acpi_device_set_power - Set power state of an ACPI device.
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* @device: Device to set the power state of.
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* @state: New power state to set.
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*
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* Callers must ensure that the device is power manageable before using this
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* function.
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*/
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int acpi_device_set_power(struct acpi_device *device, int state)
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{
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int result = 0;
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bool cut_power = false;
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if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
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return -EINVAL;
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/* Make sure this is a valid target state */
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if (state == device->power.state) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
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acpi_power_state_string(state)));
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return 0;
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}
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if (!device->power.states[state].flags.valid) {
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printk(KERN_WARNING PREFIX "Device does not support %s\n",
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acpi_power_state_string(state));
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return -ENODEV;
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}
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if (device->parent && (state < device->parent->power.state)) {
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printk(KERN_WARNING PREFIX
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"Cannot set device to a higher-powered"
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" state than parent\n");
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return -ENODEV;
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}
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/* For D3cold we should first transition into D3hot. */
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if (state == ACPI_STATE_D3_COLD
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&& device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) {
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state = ACPI_STATE_D3_HOT;
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cut_power = true;
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}
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if (state < device->power.state && state != ACPI_STATE_D0
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&& device->power.state >= ACPI_STATE_D3_HOT) {
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printk(KERN_WARNING PREFIX
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"Cannot transition to non-D0 state from D3\n");
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return -ENODEV;
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}
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/*
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* Transition Power
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* ----------------
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* In accordance with the ACPI specification first apply power (via
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* power resources) and then evalute _PSx.
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*/
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if (device->power.flags.power_resources) {
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result = acpi_power_transition(device, state);
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if (result)
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goto end;
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}
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result = acpi_dev_pm_explicit_set(device, state);
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if (result)
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goto end;
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if (cut_power) {
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device->power.state = state;
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state = ACPI_STATE_D3_COLD;
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result = acpi_power_transition(device, state);
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}
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end:
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if (result) {
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printk(KERN_WARNING PREFIX
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"Device [%s] failed to transition to %s\n",
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device->pnp.bus_id,
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acpi_power_state_string(state));
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} else {
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device->power.state = state;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Device [%s] transitioned to %s\n",
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device->pnp.bus_id,
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acpi_power_state_string(state)));
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}
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return result;
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}
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EXPORT_SYMBOL(acpi_device_set_power);
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int acpi_bus_set_power(acpi_handle handle, int state)
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{
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struct acpi_device *device;
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int result;
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result = acpi_bus_get_device(handle, &device);
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if (result)
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return result;
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if (!device->flags.power_manageable) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Device [%s] is not power manageable\n",
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dev_name(&device->dev)));
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return -ENODEV;
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}
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return acpi_device_set_power(device, state);
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}
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EXPORT_SYMBOL(acpi_bus_set_power);
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int acpi_bus_init_power(struct acpi_device *device)
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{
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int state;
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int result;
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if (!device)
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return -EINVAL;
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device->power.state = ACPI_STATE_UNKNOWN;
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result = acpi_device_get_power(device, &state);
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if (result)
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return result;
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if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) {
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result = acpi_power_on_resources(device, state);
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if (result)
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return result;
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result = acpi_dev_pm_explicit_set(device, state);
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if (result)
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return result;
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} else if (state == ACPI_STATE_UNKNOWN) {
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/* No power resources and missing _PSC? Try to force D0. */
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state = ACPI_STATE_D0;
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result = acpi_dev_pm_explicit_set(device, state);
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if (result)
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return result;
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}
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device->power.state = state;
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return 0;
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}
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int acpi_bus_update_power(acpi_handle handle, int *state_p)
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{
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struct acpi_device *device;
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int state;
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int result;
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result = acpi_bus_get_device(handle, &device);
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if (result)
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return result;
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result = acpi_device_get_power(device, &state);
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if (result)
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return result;
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if (state == ACPI_STATE_UNKNOWN)
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state = ACPI_STATE_D0;
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result = acpi_device_set_power(device, state);
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if (!result && state_p)
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*state_p = state;
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return result;
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}
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EXPORT_SYMBOL_GPL(acpi_bus_update_power);
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bool acpi_bus_power_manageable(acpi_handle handle)
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{
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struct acpi_device *device;
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int result;
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result = acpi_bus_get_device(handle, &device);
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return result ? false : device->flags.power_manageable;
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}
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EXPORT_SYMBOL(acpi_bus_power_manageable);
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bool acpi_bus_can_wakeup(acpi_handle handle)
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{
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struct acpi_device *device;
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int result;
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result = acpi_bus_get_device(handle, &device);
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return result ? false : device->wakeup.flags.valid;
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}
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EXPORT_SYMBOL(acpi_bus_can_wakeup);
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/**
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* acpi_device_power_state - Get preferred power state of ACPI device.
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* @dev: Device whose preferred target power state to return.
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* @adev: ACPI device node corresponding to @dev.
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* @target_state: System state to match the resultant device state.
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* @d_max_in: Deepest low-power state to take into consideration.
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* @d_min_p: Location to store the upper limit of the allowed states range.
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* Return value: Preferred power state of the device on success, -ENODEV
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* (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
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*
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* Find the lowest power (highest number) ACPI device power state that the
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* device can be in while the system is in the state represented by
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* @target_state. If @d_min_p is set, the highest power (lowest number) device
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* power state that @dev can be in for the given system sleep state is stored
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* at the location pointed to by it.
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*
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* Callers must ensure that @dev and @adev are valid pointers and that @adev
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* actually corresponds to @dev before using this function.
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*/
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int acpi_device_power_state(struct device *dev, struct acpi_device *adev,
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u32 target_state, int d_max_in, int *d_min_p)
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{
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char acpi_method[] = "_SxD";
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unsigned long long d_min, d_max;
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bool wakeup = false;
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if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3)
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return -EINVAL;
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if (d_max_in > ACPI_STATE_D3_HOT) {
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enum pm_qos_flags_status stat;
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stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF);
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if (stat == PM_QOS_FLAGS_ALL)
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d_max_in = ACPI_STATE_D3_HOT;
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}
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acpi_method[2] = '0' + target_state;
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/*
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* If the sleep state is S0, the lowest limit from ACPI is D3,
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* but if the device has _S0W, we will use the value from _S0W
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* as the lowest limit from ACPI. Finally, we will constrain
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* the lowest limit with the specified one.
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*/
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d_min = ACPI_STATE_D0;
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d_max = ACPI_STATE_D3;
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/*
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* If present, _SxD methods return the minimum D-state (highest power
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* state) we can use for the corresponding S-states. Otherwise, the
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* minimum D-state is D0 (ACPI 3.x).
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*
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* NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
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* provided -- that's our fault recovery, we ignore retval.
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*/
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if (target_state > ACPI_STATE_S0) {
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acpi_evaluate_integer(adev->handle, acpi_method, NULL, &d_min);
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wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
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&& adev->wakeup.sleep_state >= target_state;
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} else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) !=
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PM_QOS_FLAGS_NONE) {
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wakeup = adev->wakeup.flags.valid;
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}
|
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|
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/*
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* If _PRW says we can wake up the system from the target sleep state,
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* the D-state returned by _SxD is sufficient for that (we assume a
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* wakeup-aware driver if wake is set). Still, if _SxW exists
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* (ACPI 3.x), it should return the maximum (lowest power) D-state that
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* can wake the system. _S0W may be valid, too.
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*/
|
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if (wakeup) {
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acpi_status status;
|
|
|
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acpi_method[3] = 'W';
|
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status = acpi_evaluate_integer(adev->handle, acpi_method, NULL,
|
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&d_max);
|
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if (ACPI_FAILURE(status)) {
|
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if (target_state != ACPI_STATE_S0 ||
|
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status != AE_NOT_FOUND)
|
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d_max = d_min;
|
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} else if (d_max < d_min) {
|
|
/* Warn the user of the broken DSDT */
|
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printk(KERN_WARNING "ACPI: Wrong value from %s\n",
|
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acpi_method);
|
|
/* Sanitize it */
|
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d_min = d_max;
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}
|
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}
|
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|
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if (d_max_in < d_min)
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return -EINVAL;
|
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if (d_min_p)
|
|
*d_min_p = d_min;
|
|
/* constrain d_max with specified lowest limit (max number) */
|
|
if (d_max > d_max_in) {
|
|
for (d_max = d_max_in; d_max > d_min; d_max--) {
|
|
if (adev->power.states[d_max].flags.valid)
|
|
break;
|
|
}
|
|
}
|
|
return d_max;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_device_power_state);
|
|
|
|
/**
|
|
* acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
|
|
* @dev: Device whose preferred target power state to return.
|
|
* @d_min_p: Location to store the upper limit of the allowed states range.
|
|
* @d_max_in: Deepest low-power state to take into consideration.
|
|
* Return value: Preferred power state of the device on success, -ENODEV
|
|
* (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
|
|
*
|
|
* The caller must ensure that @dev is valid before using this function.
|
|
*/
|
|
int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
|
|
{
|
|
acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
|
|
struct acpi_device *adev;
|
|
|
|
if (!handle || acpi_bus_get_device(handle, &adev)) {
|
|
dev_dbg(dev, "ACPI handle without context in %s!\n", __func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return acpi_device_power_state(dev, adev, acpi_target_system_state(),
|
|
d_max_in, d_min_p);
|
|
}
|
|
EXPORT_SYMBOL(acpi_pm_device_sleep_state);
|
|
|
|
#ifdef CONFIG_PM_RUNTIME
|
|
/**
|
|
* acpi_wakeup_device - Wakeup notification handler for ACPI devices.
|
|
* @handle: ACPI handle of the device the notification is for.
|
|
* @event: Type of the signaled event.
|
|
* @context: Device corresponding to @handle.
|
|
*/
|
|
static void acpi_wakeup_device(acpi_handle handle, u32 event, void *context)
|
|
{
|
|
struct device *dev = context;
|
|
|
|
if (event == ACPI_NOTIFY_DEVICE_WAKE && dev) {
|
|
pm_wakeup_event(dev, 0);
|
|
pm_runtime_resume(dev);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* __acpi_device_run_wake - Enable/disable runtime remote wakeup for device.
|
|
* @adev: ACPI device to enable/disable the remote wakeup for.
|
|
* @enable: Whether to enable or disable the wakeup functionality.
|
|
*
|
|
* Enable/disable the GPE associated with @adev so that it can generate
|
|
* wakeup signals for the device in response to external (remote) events and
|
|
* enable/disable device wakeup power.
|
|
*
|
|
* Callers must ensure that @adev is a valid ACPI device node before executing
|
|
* this function.
|
|
*/
|
|
int __acpi_device_run_wake(struct acpi_device *adev, bool enable)
|
|
{
|
|
struct acpi_device_wakeup *wakeup = &adev->wakeup;
|
|
|
|
if (enable) {
|
|
acpi_status res;
|
|
int error;
|
|
|
|
error = acpi_enable_wakeup_device_power(adev, ACPI_STATE_S0);
|
|
if (error)
|
|
return error;
|
|
|
|
res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
|
|
if (ACPI_FAILURE(res)) {
|
|
acpi_disable_wakeup_device_power(adev);
|
|
return -EIO;
|
|
}
|
|
} else {
|
|
acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
|
|
acpi_disable_wakeup_device_power(adev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpi_pm_device_run_wake - Enable/disable remote wakeup for given device.
|
|
* @dev: Device to enable/disable the platform to wake up.
|
|
* @enable: Whether to enable or disable the wakeup functionality.
|
|
*/
|
|
int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
|
|
{
|
|
struct acpi_device *adev;
|
|
acpi_handle handle;
|
|
|
|
if (!device_run_wake(phys_dev))
|
|
return -EINVAL;
|
|
|
|
handle = DEVICE_ACPI_HANDLE(phys_dev);
|
|
if (!handle || acpi_bus_get_device(handle, &adev)) {
|
|
dev_dbg(phys_dev, "ACPI handle without context in %s!\n",
|
|
__func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return __acpi_device_run_wake(adev, enable);
|
|
}
|
|
EXPORT_SYMBOL(acpi_pm_device_run_wake);
|
|
#else
|
|
static inline void acpi_wakeup_device(acpi_handle handle, u32 event,
|
|
void *context) {}
|
|
#endif /* CONFIG_PM_RUNTIME */
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
/**
|
|
* __acpi_device_sleep_wake - Enable or disable device to wake up the system.
|
|
* @dev: Device to enable/desible to wake up the system.
|
|
* @target_state: System state the device is supposed to wake up from.
|
|
* @enable: Whether to enable or disable @dev to wake up the system.
|
|
*/
|
|
int __acpi_device_sleep_wake(struct acpi_device *adev, u32 target_state,
|
|
bool enable)
|
|
{
|
|
return enable ?
|
|
acpi_enable_wakeup_device_power(adev, target_state) :
|
|
acpi_disable_wakeup_device_power(adev);
|
|
}
|
|
|
|
/**
|
|
* acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
|
|
* @dev: Device to enable/desible to wake up the system from sleep states.
|
|
* @enable: Whether to enable or disable @dev to wake up the system.
|
|
*/
|
|
int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
|
|
{
|
|
acpi_handle handle;
|
|
struct acpi_device *adev;
|
|
int error;
|
|
|
|
if (!device_can_wakeup(dev))
|
|
return -EINVAL;
|
|
|
|
handle = DEVICE_ACPI_HANDLE(dev);
|
|
if (!handle || acpi_bus_get_device(handle, &adev)) {
|
|
dev_dbg(dev, "ACPI handle without context in %s!\n", __func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
error = __acpi_device_sleep_wake(adev, acpi_target_system_state(),
|
|
enable);
|
|
if (!error)
|
|
dev_info(dev, "System wakeup %s by ACPI\n",
|
|
enable ? "enabled" : "disabled");
|
|
|
|
return error;
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
/**
|
|
* acpi_dev_pm_get_node - Get ACPI device node for the given physical device.
|
|
* @dev: Device to get the ACPI node for.
|
|
*/
|
|
struct acpi_device *acpi_dev_pm_get_node(struct device *dev)
|
|
{
|
|
acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
|
|
struct acpi_device *adev;
|
|
|
|
return handle && !acpi_bus_get_device(handle, &adev) ? adev : NULL;
|
|
}
|
|
|
|
/**
|
|
* acpi_dev_pm_low_power - Put ACPI device into a low-power state.
|
|
* @dev: Device to put into a low-power state.
|
|
* @adev: ACPI device node corresponding to @dev.
|
|
* @system_state: System state to choose the device state for.
|
|
*/
|
|
static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev,
|
|
u32 system_state)
|
|
{
|
|
int power_state;
|
|
|
|
if (!acpi_device_power_manageable(adev))
|
|
return 0;
|
|
|
|
power_state = acpi_device_power_state(dev, adev, system_state,
|
|
ACPI_STATE_D3, NULL);
|
|
if (power_state < ACPI_STATE_D0 || power_state > ACPI_STATE_D3)
|
|
return -EIO;
|
|
|
|
return acpi_device_set_power(adev, power_state);
|
|
}
|
|
|
|
/**
|
|
* acpi_dev_pm_full_power - Put ACPI device into the full-power state.
|
|
* @adev: ACPI device node to put into the full-power state.
|
|
*/
|
|
static int acpi_dev_pm_full_power(struct acpi_device *adev)
|
|
{
|
|
return acpi_device_power_manageable(adev) ?
|
|
acpi_device_set_power(adev, ACPI_STATE_D0) : 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_RUNTIME
|
|
/**
|
|
* acpi_dev_runtime_suspend - Put device into a low-power state using ACPI.
|
|
* @dev: Device to put into a low-power state.
|
|
*
|
|
* Put the given device into a runtime low-power state using the standard ACPI
|
|
* mechanism. Set up remote wakeup if desired, choose the state to put the
|
|
* device into (this checks if remote wakeup is expected to work too), and set
|
|
* the power state of the device.
|
|
*/
|
|
int acpi_dev_runtime_suspend(struct device *dev)
|
|
{
|
|
struct acpi_device *adev = acpi_dev_pm_get_node(dev);
|
|
bool remote_wakeup;
|
|
int error;
|
|
|
|
if (!adev)
|
|
return 0;
|
|
|
|
remote_wakeup = dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) >
|
|
PM_QOS_FLAGS_NONE;
|
|
error = __acpi_device_run_wake(adev, remote_wakeup);
|
|
if (remote_wakeup && error)
|
|
return -EAGAIN;
|
|
|
|
error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
|
|
if (error)
|
|
__acpi_device_run_wake(adev, false);
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend);
|
|
|
|
/**
|
|
* acpi_dev_runtime_resume - Put device into the full-power state using ACPI.
|
|
* @dev: Device to put into the full-power state.
|
|
*
|
|
* Put the given device into the full-power state using the standard ACPI
|
|
* mechanism at run time. Set the power state of the device to ACPI D0 and
|
|
* disable remote wakeup.
|
|
*/
|
|
int acpi_dev_runtime_resume(struct device *dev)
|
|
{
|
|
struct acpi_device *adev = acpi_dev_pm_get_node(dev);
|
|
int error;
|
|
|
|
if (!adev)
|
|
return 0;
|
|
|
|
error = acpi_dev_pm_full_power(adev);
|
|
__acpi_device_run_wake(adev, false);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume);
|
|
|
|
/**
|
|
* acpi_subsys_runtime_suspend - Suspend device using ACPI.
|
|
* @dev: Device to suspend.
|
|
*
|
|
* Carry out the generic runtime suspend procedure for @dev and use ACPI to put
|
|
* it into a runtime low-power state.
|
|
*/
|
|
int acpi_subsys_runtime_suspend(struct device *dev)
|
|
{
|
|
int ret = pm_generic_runtime_suspend(dev);
|
|
return ret ? ret : acpi_dev_runtime_suspend(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend);
|
|
|
|
/**
|
|
* acpi_subsys_runtime_resume - Resume device using ACPI.
|
|
* @dev: Device to Resume.
|
|
*
|
|
* Use ACPI to put the given device into the full-power state and carry out the
|
|
* generic runtime resume procedure for it.
|
|
*/
|
|
int acpi_subsys_runtime_resume(struct device *dev)
|
|
{
|
|
int ret = acpi_dev_runtime_resume(dev);
|
|
return ret ? ret : pm_generic_runtime_resume(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume);
|
|
#endif /* CONFIG_PM_RUNTIME */
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
/**
|
|
* acpi_dev_suspend_late - Put device into a low-power state using ACPI.
|
|
* @dev: Device to put into a low-power state.
|
|
*
|
|
* Put the given device into a low-power state during system transition to a
|
|
* sleep state using the standard ACPI mechanism. Set up system wakeup if
|
|
* desired, choose the state to put the device into (this checks if system
|
|
* wakeup is expected to work too), and set the power state of the device.
|
|
*/
|
|
int acpi_dev_suspend_late(struct device *dev)
|
|
{
|
|
struct acpi_device *adev = acpi_dev_pm_get_node(dev);
|
|
u32 target_state;
|
|
bool wakeup;
|
|
int error;
|
|
|
|
if (!adev)
|
|
return 0;
|
|
|
|
target_state = acpi_target_system_state();
|
|
wakeup = device_may_wakeup(dev);
|
|
error = __acpi_device_sleep_wake(adev, target_state, wakeup);
|
|
if (wakeup && error)
|
|
return error;
|
|
|
|
error = acpi_dev_pm_low_power(dev, adev, target_state);
|
|
if (error)
|
|
__acpi_device_sleep_wake(adev, ACPI_STATE_UNKNOWN, false);
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_suspend_late);
|
|
|
|
/**
|
|
* acpi_dev_resume_early - Put device into the full-power state using ACPI.
|
|
* @dev: Device to put into the full-power state.
|
|
*
|
|
* Put the given device into the full-power state using the standard ACPI
|
|
* mechanism during system transition to the working state. Set the power
|
|
* state of the device to ACPI D0 and disable remote wakeup.
|
|
*/
|
|
int acpi_dev_resume_early(struct device *dev)
|
|
{
|
|
struct acpi_device *adev = acpi_dev_pm_get_node(dev);
|
|
int error;
|
|
|
|
if (!adev)
|
|
return 0;
|
|
|
|
error = acpi_dev_pm_full_power(adev);
|
|
__acpi_device_sleep_wake(adev, ACPI_STATE_UNKNOWN, false);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_resume_early);
|
|
|
|
/**
|
|
* acpi_subsys_prepare - Prepare device for system transition to a sleep state.
|
|
* @dev: Device to prepare.
|
|
*/
|
|
int acpi_subsys_prepare(struct device *dev)
|
|
{
|
|
/*
|
|
* Follow PCI and resume devices suspended at run time before running
|
|
* their system suspend callbacks.
|
|
*/
|
|
pm_runtime_resume(dev);
|
|
return pm_generic_prepare(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_prepare);
|
|
|
|
/**
|
|
* acpi_subsys_suspend_late - Suspend device using ACPI.
|
|
* @dev: Device to suspend.
|
|
*
|
|
* Carry out the generic late suspend procedure for @dev and use ACPI to put
|
|
* it into a low-power state during system transition into a sleep state.
|
|
*/
|
|
int acpi_subsys_suspend_late(struct device *dev)
|
|
{
|
|
int ret = pm_generic_suspend_late(dev);
|
|
return ret ? ret : acpi_dev_suspend_late(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late);
|
|
|
|
/**
|
|
* acpi_subsys_resume_early - Resume device using ACPI.
|
|
* @dev: Device to Resume.
|
|
*
|
|
* Use ACPI to put the given device into the full-power state and carry out the
|
|
* generic early resume procedure for it during system transition into the
|
|
* working state.
|
|
*/
|
|
int acpi_subsys_resume_early(struct device *dev)
|
|
{
|
|
int ret = acpi_dev_resume_early(dev);
|
|
return ret ? ret : pm_generic_resume_early(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_resume_early);
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static struct dev_pm_domain acpi_general_pm_domain = {
|
|
.ops = {
|
|
#ifdef CONFIG_PM_RUNTIME
|
|
.runtime_suspend = acpi_subsys_runtime_suspend,
|
|
.runtime_resume = acpi_subsys_runtime_resume,
|
|
.runtime_idle = pm_generic_runtime_idle,
|
|
#endif
|
|
#ifdef CONFIG_PM_SLEEP
|
|
.prepare = acpi_subsys_prepare,
|
|
.suspend_late = acpi_subsys_suspend_late,
|
|
.resume_early = acpi_subsys_resume_early,
|
|
.poweroff_late = acpi_subsys_suspend_late,
|
|
.restore_early = acpi_subsys_resume_early,
|
|
#endif
|
|
},
|
|
};
|
|
|
|
/**
|
|
* acpi_dev_pm_attach - Prepare device for ACPI power management.
|
|
* @dev: Device to prepare.
|
|
* @power_on: Whether or not to power on the device.
|
|
*
|
|
* If @dev has a valid ACPI handle that has a valid struct acpi_device object
|
|
* attached to it, install a wakeup notification handler for the device and
|
|
* add it to the general ACPI PM domain. If @power_on is set, the device will
|
|
* be put into the ACPI D0 state before the function returns.
|
|
*
|
|
* This assumes that the @dev's bus type uses generic power management callbacks
|
|
* (or doesn't use any power management callbacks at all).
|
|
*
|
|
* Callers must ensure proper synchronization of this function with power
|
|
* management callbacks.
|
|
*/
|
|
int acpi_dev_pm_attach(struct device *dev, bool power_on)
|
|
{
|
|
struct acpi_device *adev = acpi_dev_pm_get_node(dev);
|
|
|
|
if (!adev)
|
|
return -ENODEV;
|
|
|
|
if (dev->pm_domain)
|
|
return -EEXIST;
|
|
|
|
acpi_add_pm_notifier(adev, acpi_wakeup_device, dev);
|
|
dev->pm_domain = &acpi_general_pm_domain;
|
|
if (power_on) {
|
|
acpi_dev_pm_full_power(adev);
|
|
__acpi_device_run_wake(adev, false);
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_pm_attach);
|
|
|
|
/**
|
|
* acpi_dev_pm_detach - Remove ACPI power management from the device.
|
|
* @dev: Device to take care of.
|
|
* @power_off: Whether or not to try to remove power from the device.
|
|
*
|
|
* Remove the device from the general ACPI PM domain and remove its wakeup
|
|
* notifier. If @power_off is set, additionally remove power from the device if
|
|
* possible.
|
|
*
|
|
* Callers must ensure proper synchronization of this function with power
|
|
* management callbacks.
|
|
*/
|
|
void acpi_dev_pm_detach(struct device *dev, bool power_off)
|
|
{
|
|
struct acpi_device *adev = acpi_dev_pm_get_node(dev);
|
|
|
|
if (adev && dev->pm_domain == &acpi_general_pm_domain) {
|
|
dev->pm_domain = NULL;
|
|
acpi_remove_pm_notifier(adev, acpi_wakeup_device);
|
|
if (power_off) {
|
|
/*
|
|
* If the device's PM QoS resume latency limit or flags
|
|
* have been exposed to user space, they have to be
|
|
* hidden at this point, so that they don't affect the
|
|
* choice of the low-power state to put the device into.
|
|
*/
|
|
dev_pm_qos_hide_latency_limit(dev);
|
|
dev_pm_qos_hide_flags(dev);
|
|
__acpi_device_run_wake(adev, false);
|
|
acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_pm_detach);
|
|
|
|
/**
|
|
* acpi_dev_pm_add_dependent - Add physical device depending for PM.
|
|
* @handle: Handle of ACPI device node.
|
|
* @depdev: Device depending on that node for PM.
|
|
*/
|
|
void acpi_dev_pm_add_dependent(acpi_handle handle, struct device *depdev)
|
|
{
|
|
struct acpi_device_physical_node *dep;
|
|
struct acpi_device *adev;
|
|
|
|
if (!depdev || acpi_bus_get_device(handle, &adev))
|
|
return;
|
|
|
|
mutex_lock(&adev->physical_node_lock);
|
|
|
|
list_for_each_entry(dep, &adev->power_dependent, node)
|
|
if (dep->dev == depdev)
|
|
goto out;
|
|
|
|
dep = kzalloc(sizeof(*dep), GFP_KERNEL);
|
|
if (dep) {
|
|
dep->dev = depdev;
|
|
list_add_tail(&dep->node, &adev->power_dependent);
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&adev->physical_node_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_pm_add_dependent);
|
|
|
|
/**
|
|
* acpi_dev_pm_remove_dependent - Remove physical device depending for PM.
|
|
* @handle: Handle of ACPI device node.
|
|
* @depdev: Device depending on that node for PM.
|
|
*/
|
|
void acpi_dev_pm_remove_dependent(acpi_handle handle, struct device *depdev)
|
|
{
|
|
struct acpi_device_physical_node *dep;
|
|
struct acpi_device *adev;
|
|
|
|
if (!depdev || acpi_bus_get_device(handle, &adev))
|
|
return;
|
|
|
|
mutex_lock(&adev->physical_node_lock);
|
|
|
|
list_for_each_entry(dep, &adev->power_dependent, node)
|
|
if (dep->dev == depdev) {
|
|
list_del(&dep->node);
|
|
kfree(dep);
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&adev->physical_node_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_pm_remove_dependent);
|