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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <map>
#include <string>
#include "base/macros.h"
#include "chromeos/chromeos_export.h"
#include "chromeos/dbus/power_manager/policy.pb.h"
#include "chromeos/dbus/power_manager_client.h"
namespace chromeos {
// PowerPolicyController is responsible for sending Chrome's assorted power
// management preferences to the Chrome OS power manager.
class CHROMEOS_EXPORT PowerPolicyController
: public PowerManagerClient::Observer {
// Sets the global instance. Must be called before any calls to Get().
static void Initialize(PowerManagerClient* power_manager_client);
// Returns true if the global instance has been initialized.
static bool IsInitialized();
// Destroys the global instance.
static void Shutdown();
// Returns the global instance. Initialize() must be called first.
static PowerPolicyController* Get();
// Reasons why a wake lock may be added.
// TODO(derat): Remove this enum in favor of device::mojom::WakeLockReason
// once this class has been moved to the device service:
enum WakeLockReason {
// Note: Do not change these values; they are used by preferences.
enum Action {
// Values of various power-management-related preferences.
struct PrefValues {
int ac_screen_dim_delay_ms;
int ac_screen_off_delay_ms;
int ac_screen_lock_delay_ms;
int ac_idle_warning_delay_ms;
int ac_idle_delay_ms;
int battery_screen_dim_delay_ms;
int battery_screen_off_delay_ms;
int battery_screen_lock_delay_ms;
int battery_idle_warning_delay_ms;
int battery_idle_delay_ms;
Action ac_idle_action;
Action battery_idle_action;
Action lid_closed_action;
bool use_audio_activity;
bool use_video_activity;
double ac_brightness_percent;
double battery_brightness_percent;
bool allow_screen_wake_locks;
bool enable_auto_screen_lock;
double presentation_screen_dim_delay_factor;
double user_activity_screen_dim_delay_factor;
bool wait_for_initial_user_activity;
bool force_nonzero_brightness_for_user_activity;
// Returns a string describing |policy|. Useful for tests.
static std::string GetPolicyDebugString(
const power_manager::PowerManagementPolicy& policy);
// Delay in milliseconds between the screen being turned off and the screen
// being locked. Used if the |enable_auto_screen_lock| pref is set but
// |*_screen_lock_delay_ms| are unset or set to higher values than what this
// constant would imply.
static const int kScreenLockAfterOffDelayMs;
// String added to a PowerManagementPolicy |reason| field if the policy has
// been modified by preferences.
static const char kPrefsReason[];
bool honor_screen_wake_locks_for_test() const {
return honor_screen_wake_locks_;
// Updates |prefs_policy_| with |values| and sends an updated policy.
void ApplyPrefs(const PrefValues& values);
// Registers a request to temporarily prevent the screen from getting dimmed
// or turned off or the system from suspending in response to user inactivity
// and sends an updated policy. |description| is a human-readable description
// of the reason the lock was created. Returns a unique ID that can be passed
// to RemoveWakeLock() later.
// See the comment above WakeLock::Type for descriptions of the lock types.
int AddScreenWakeLock(WakeLockReason reason, const std::string& description);
int AddDimWakeLock(WakeLockReason reason, const std::string& description);
int AddSystemWakeLock(WakeLockReason reason, const std::string& description);
// Unregisters a request previously created via an Add*WakeLock() call
// and sends an updated policy.
void RemoveWakeLock(int id);
// Adjusts policy while Chrome is exiting. The lid-closed action
// is overridden to ensure that the system doesn't suspend or shut
// down.
void NotifyChromeIsExiting();
// Adjusts policy when the migration of a user homedir to a new
// encryption format starts or stops. While migration is active,
// the lid-closed action is overridden to ensure the system
// doesn't shut down.
void SetEncryptionMigrationActive(bool active);
// PowerManagerClient::Observer implementation:
void PowerManagerRestarted() override;
explicit PowerPolicyController(PowerManagerClient* client);
~PowerPolicyController() override;
// Details about a wake lock added via Add*WakeLock().
// SCREEN and DIM will keep the screen on and prevent it from locking.
// SCREEN will also prevent it from dimming. SYSTEM will prevent idle
// suspends, but the screen will turn off and lock normally.
struct WakeLock {
// TODO(derat): Remove this enum in favor of device::mojom::WakeLockType
// once this class has been moved to the device service:
enum Type {
WakeLock(Type type, WakeLockReason reason, const std::string& description);
const Type type;
const WakeLockReason reason;
const std::string description;
using WakeLockMap = std::map<int, WakeLock>;
// Helper method for AddScreenWakeLock() and AddSystemWakeLock().
int AddWakeLockInternal(WakeLock::Type type,
WakeLockReason reason,
const std::string& description);
// Sends a policy based on |prefs_policy_| to the power manager.
void SendCurrentPolicy();
PowerManagerClient* client_; // weak
// Policy derived from values passed to ApplyPrefs().
power_manager::PowerManagementPolicy prefs_policy_;
// Was ApplyPrefs() called?
bool prefs_were_set_;
// Maps from an ID representing a request to prevent the screen from
// getting dimmed or turned off or to prevent the system from suspending
// to details about the request.
WakeLockMap wake_locks_;
// Should TYPE_SCREEN or TYPE_DIM entries in |wake_locks_| be honored?
// If false, screen wake locks are just treated as TYPE_SYSTEM instead.
bool honor_screen_wake_locks_;
// Next ID to be used by an Add*WakeLock() request.
int next_wake_lock_id_;
// True if Chrome is in the process of exiting.
bool chrome_is_exiting_;
// True if a user homedir is in the process of migrating encryption formats.
bool encryption_migration_active_;
} // namespace chromeos