Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1517 insertions, 0 deletions

diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
new file mode 100644
index 000000000..f007116a8
--- /dev/null
+++ b/drivers/acpi/device_pm.c
@@ -0,0 +1,1517 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * drivers/acpi/device_pm.c - ACPI device power management routines.
+ *
+ * Copyright (C) 2012, Intel Corp.
+ * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#define pr_fmt(fmt) "PM: " fmt
+
+#include <linux/acpi.h>
+#include <linux/export.h>
+#include <linux/mutex.h>
+#include <linux/pm_qos.h>
+#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
+#include <linux/suspend.h>
+
+#include "fan.h"
+#include "internal.h"
+
+/**
+ * acpi_power_state_string - String representation of ACPI device power state.
+ * @state: ACPI device power state to return the string representation of.
+ */
+const char *acpi_power_state_string(int state)
+{
+	switch (state) {
+	case ACPI_STATE_D0:
+		return "D0";
+	case ACPI_STATE_D1:
+		return "D1";
+	case ACPI_STATE_D2:
+		return "D2";
+	case ACPI_STATE_D3_HOT:
+		return "D3hot";
+	case ACPI_STATE_D3_COLD:
+		return "D3cold";
+	default:
+		return "(unknown)";
+	}
+}
+
+static int acpi_dev_pm_explicit_get(struct acpi_device *device, int *state)
+{
+	unsigned long long psc;
+	acpi_status status;
+
+	status = acpi_evaluate_integer(device->handle, "_PSC", NULL, &psc);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	*state = psc;
+	return 0;
+}
+
+/**
+ * acpi_device_get_power - Get power state of an ACPI device.
+ * @device: Device to get the power state of.
+ * @state: Place to store the power state of the device.
+ *
+ * This function does not update the device's power.state field, but it may
+ * update its parent's power.state field (when the parent's power state is
+ * unknown and the device's power state turns out to be D0).
+ *
+ * Also, it does not update power resource reference counters to ensure that
+ * the power state returned by it will be persistent and it may return a power
+ * state shallower than previously set by acpi_device_set_power() for @device
+ * (if that power state depends on any power resources).
+ */
+int acpi_device_get_power(struct acpi_device *device, int *state)
+{
+	int result = ACPI_STATE_UNKNOWN;
+	struct acpi_device *parent;
+	int error;
+
+	if (!device || !state)
+		return -EINVAL;
+
+	parent = acpi_dev_parent(device);
+
+	if (!device->flags.power_manageable) {
+		/* TBD: Non-recursive algorithm for walking up hierarchy. */
+		*state = parent ? parent->power.state : ACPI_STATE_D0;
+		goto out;
+	}
+
+	/*
+	 * Get the device's power state from power resources settings and _PSC,
+	 * if available.
+	 */
+	if (device->power.flags.power_resources) {
+		error = acpi_power_get_inferred_state(device, &result);
+		if (error)
+			return error;
+	}
+	if (device->power.flags.explicit_get) {
+		int psc;
+
+		error = acpi_dev_pm_explicit_get(device, &psc);
+		if (error)
+			return error;
+
+		/*
+		 * The power resources settings may indicate a power state
+		 * shallower than the actual power state of the device, because
+		 * the same power resources may be referenced by other devices.
+		 *
+		 * For systems predating ACPI 4.0 we assume that D3hot is the
+		 * deepest state that can be supported.
+		 */
+		if (psc > result && psc < ACPI_STATE_D3_COLD)
+			result = psc;
+		else if (result == ACPI_STATE_UNKNOWN)
+			result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_HOT : psc;
+	}
+
+	/*
+	 * If we were unsure about the device parent's power state up to this
+	 * point, the fact that the device is in D0 implies that the parent has
+	 * to be in D0 too, except if ignore_parent is set.
+	 */
+	if (!device->power.flags.ignore_parent && parent &&
+	    parent->power.state == ACPI_STATE_UNKNOWN &&
+	    result == ACPI_STATE_D0)
+		parent->power.state = ACPI_STATE_D0;
+
+	*state = result;
+
+ out:
+	acpi_handle_debug(device->handle, "Power state: %s\n",
+			  acpi_power_state_string(*state));
+
+	return 0;
+}
+
+static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state)
+{
+	if (adev->power.states[state].flags.explicit_set) {
+		char method[5] = { '_', 'P', 'S', '0' + state, '\0' };
+		acpi_status status;
+
+		status = acpi_evaluate_object(adev->handle, method, NULL, NULL);
+		if (ACPI_FAILURE(status))
+			return -ENODEV;
+	}
+	return 0;
+}
+
+/**
+ * acpi_device_set_power - Set power state of an ACPI device.
+ * @device: Device to set the power state of.
+ * @state: New power state to set.
+ *
+ * Callers must ensure that the device is power manageable before using this
+ * function.
+ */
+int acpi_device_set_power(struct acpi_device *device, int state)
+{
+	int target_state = state;
+	int result = 0;
+
+	if (!device || !device->flags.power_manageable
+	    || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
+		return -EINVAL;
+
+	acpi_handle_debug(device->handle, "Power state change: %s -> %s\n",
+			  acpi_power_state_string(device->power.state),
+			  acpi_power_state_string(state));
+
+	/* Make sure this is a valid target state */
+
+	/* There is a special case for D0 addressed below. */
+	if (state > ACPI_STATE_D0 && state == device->power.state)
+		goto no_change;
+
+	if (state == ACPI_STATE_D3_COLD) {
+		/*
+		 * For transitions to D3cold we need to execute _PS3 and then
+		 * possibly drop references to the power resources in use.
+		 */
+		state = ACPI_STATE_D3_HOT;
+		/* If D3cold is not supported, use D3hot as the target state. */
+		if (!device->power.states[ACPI_STATE_D3_COLD].flags.valid)
+			target_state = state;
+	} else if (!device->power.states[state].flags.valid) {
+		acpi_handle_debug(device->handle, "Power state %s not supported\n",
+				  acpi_power_state_string(state));
+		return -ENODEV;
+	}
+
+	if (!device->power.flags.ignore_parent) {
+		struct acpi_device *parent;
+
+		parent = acpi_dev_parent(device);
+		if (parent && state < parent->power.state) {
+			acpi_handle_debug(device->handle,
+					  "Cannot transition to %s for parent in %s\n",
+					  acpi_power_state_string(state),
+					  acpi_power_state_string(parent->power.state));
+			return -ENODEV;
+		}
+	}
+
+	/*
+	 * Transition Power
+	 * ----------------
+	 * In accordance with ACPI 6, _PSx is executed before manipulating power
+	 * resources, unless the target state is D0, in which case _PS0 is
+	 * supposed to be executed after turning the power resources on.
+	 */
+	if (state > ACPI_STATE_D0) {
+		/*
+		 * According to ACPI 6, devices cannot go from lower-power
+		 * (deeper) states to higher-power (shallower) states.
+		 */
+		if (state < device->power.state) {
+			acpi_handle_debug(device->handle,
+					  "Cannot transition from %s to %s\n",
+					  acpi_power_state_string(device->power.state),
+					  acpi_power_state_string(state));
+			return -ENODEV;
+		}
+
+		/*
+		 * If the device goes from D3hot to D3cold, _PS3 has been
+		 * evaluated for it already, so skip it in that case.
+		 */
+		if (device->power.state < ACPI_STATE_D3_HOT) {
+			result = acpi_dev_pm_explicit_set(device, state);
+			if (result)
+				goto end;
+		}
+
+		if (device->power.flags.power_resources)
+			result = acpi_power_transition(device, target_state);
+	} else {
+		int cur_state = device->power.state;
+
+		if (device->power.flags.power_resources) {
+			result = acpi_power_transition(device, ACPI_STATE_D0);
+			if (result)
+				goto end;
+		}
+
+		if (cur_state == ACPI_STATE_D0) {
+			int psc;
+
+			/* Nothing to do here if _PSC is not present. */
+			if (!device->power.flags.explicit_get)
+				goto no_change;
+
+			/*
+			 * The power state of the device was set to D0 last
+			 * time, but that might have happened before a
+			 * system-wide transition involving the platform
+			 * firmware, so it may be necessary to evaluate _PS0
+			 * for the device here.  However, use extra care here
+			 * and evaluate _PSC to check the device's current power
+			 * state, and only invoke _PS0 if the evaluation of _PSC
+			 * is successful and it returns a power state different
+			 * from D0.
+			 */
+			result = acpi_dev_pm_explicit_get(device, &psc);
+			if (result || psc == ACPI_STATE_D0)
+				goto no_change;
+		}
+
+		result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);
+	}
+
+end:
+	if (result) {
+		acpi_handle_debug(device->handle,
+				  "Failed to change power state to %s\n",
+				  acpi_power_state_string(target_state));
+	} else {
+		device->power.state = target_state;
+		acpi_handle_debug(device->handle, "Power state changed to %s\n",
+				  acpi_power_state_string(target_state));
+	}
+
+	return result;
+
+no_change:
+	acpi_handle_debug(device->handle, "Already in %s\n",
+			  acpi_power_state_string(state));
+	return 0;
+}
+EXPORT_SYMBOL(acpi_device_set_power);
+
+int acpi_bus_set_power(acpi_handle handle, int state)
+{
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
+
+	if (device)
+		return acpi_device_set_power(device, state);
+
+	return -ENODEV;
+}
+EXPORT_SYMBOL(acpi_bus_set_power);
+
+int acpi_bus_init_power(struct acpi_device *device)
+{
+	int state;
+	int result;
+
+	if (!device)
+		return -EINVAL;
+
+	device->power.state = ACPI_STATE_UNKNOWN;
+	if (!acpi_device_is_present(device)) {
+		device->flags.initialized = false;
+		return -ENXIO;
+	}
+
+	result = acpi_device_get_power(device, &state);
+	if (result)
+		return result;
+
+	if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) {
+		/* Reference count the power resources. */
+		result = acpi_power_on_resources(device, state);
+		if (result)
+			return result;
+
+		if (state == ACPI_STATE_D0) {
+			/*
+			 * If _PSC is not present and the state inferred from
+			 * power resources appears to be D0, it still may be
+			 * necessary to execute _PS0 at this point, because
+			 * another device using the same power resources may
+			 * have been put into D0 previously and that's why we
+			 * see D0 here.
+			 */
+			result = acpi_dev_pm_explicit_set(device, state);
+			if (result)
+				return result;
+		}
+	} else if (state == ACPI_STATE_UNKNOWN) {
+		/*
+		 * No power resources and missing _PSC?  Cross fingers and make
+		 * it D0 in hope that this is what the BIOS put the device into.
+		 * [We tried to force D0 here by executing _PS0, but that broke
+		 * Toshiba P870-303 in a nasty way.]
+		 */
+		state = ACPI_STATE_D0;
+	}
+	device->power.state = state;
+	return 0;
+}
+
+/**
+ * acpi_device_fix_up_power - Force device with missing _PSC into D0.
+ * @device: Device object whose power state is to be fixed up.
+ *
+ * Devices without power resources and _PSC, but having _PS0 and _PS3 defined,
+ * are assumed to be put into D0 by the BIOS.  However, in some cases that may
+ * not be the case and this function should be used then.
+ */
+int acpi_device_fix_up_power(struct acpi_device *device)
+{
+	int ret = 0;
+
+	if (!device->power.flags.power_resources
+	    && !device->power.flags.explicit_get
+	    && device->power.state == ACPI_STATE_D0)
+		ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(acpi_device_fix_up_power);
+
+static int fix_up_power_if_applicable(struct acpi_device *adev, void *not_used)
+{
+	if (adev->status.present && adev->status.enabled)
+		acpi_device_fix_up_power(adev);
+
+	return 0;
+}
+
+/**
+ * acpi_device_fix_up_power_extended - Force device and its children into D0.
+ * @adev: Parent device object whose power state is to be fixed up.
+ *
+ * Call acpi_device_fix_up_power() for @adev and its children so long as they
+ * are reported as present and enabled.
+ */
+void acpi_device_fix_up_power_extended(struct acpi_device *adev)
+{
+	acpi_device_fix_up_power(adev);
+	acpi_dev_for_each_child(adev, fix_up_power_if_applicable, NULL);
+}
+EXPORT_SYMBOL_GPL(acpi_device_fix_up_power_extended);
+
+int acpi_device_update_power(struct acpi_device *device, int *state_p)
+{
+	int state;
+	int result;
+
+	if (device->power.state == ACPI_STATE_UNKNOWN) {
+		result = acpi_bus_init_power(device);
+		if (!result && state_p)
+			*state_p = device->power.state;
+
+		return result;
+	}
+
+	result = acpi_device_get_power(device, &state);
+	if (result)
+		return result;
+
+	if (state == ACPI_STATE_UNKNOWN) {
+		state = ACPI_STATE_D0;
+		result = acpi_device_set_power(device, state);
+		if (result)
+			return result;
+	} else {
+		if (device->power.flags.power_resources) {
+			/*
+			 * We don't need to really switch the state, bu we need
+			 * to update the power resources' reference counters.
+			 */
+			result = acpi_power_transition(device, state);
+			if (result)
+				return result;
+		}
+		device->power.state = state;
+	}
+	if (state_p)
+		*state_p = state;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_device_update_power);
+
+int acpi_bus_update_power(acpi_handle handle, int *state_p)
+{
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
+
+	if (device)
+		return acpi_device_update_power(device, state_p);
+
+	return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(acpi_bus_update_power);
+
+bool acpi_bus_power_manageable(acpi_handle handle)
+{
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
+
+	return device && device->flags.power_manageable;
+}
+EXPORT_SYMBOL(acpi_bus_power_manageable);
+
+static int acpi_power_up_if_adr_present(struct acpi_device *adev, void *not_used)
+{
+	if (!(adev->flags.power_manageable && adev->pnp.type.bus_address))
+		return 0;
+
+	acpi_handle_debug(adev->handle, "Power state: %s\n",
+			  acpi_power_state_string(adev->power.state));
+
+	if (adev->power.state == ACPI_STATE_D3_COLD)
+		return acpi_device_set_power(adev, ACPI_STATE_D0);
+
+	return 0;
+}
+
+/**
+ * acpi_dev_power_up_children_with_adr - Power up childres with valid _ADR
+ * @adev: Parent ACPI device object.
+ *
+ * Change the power states of the direct children of @adev that are in D3cold
+ * and hold valid _ADR objects to D0 in order to allow bus (e.g. PCI)
+ * enumeration code to access them.
+ */
+void acpi_dev_power_up_children_with_adr(struct acpi_device *adev)
+{
+	acpi_dev_for_each_child(adev, acpi_power_up_if_adr_present, NULL);
+}
+
+/**
+ * acpi_dev_power_state_for_wake - Deepest power state for wakeup signaling
+ * @adev: ACPI companion of the target device.
+ *
+ * Evaluate _S0W for @adev and return the value produced by it or return
+ * ACPI_STATE_UNKNOWN on errors (including _S0W not present).
+ */
+u8 acpi_dev_power_state_for_wake(struct acpi_device *adev)
+{
+	unsigned long long state;
+	acpi_status status;
+
+	status = acpi_evaluate_integer(adev->handle, "_S0W", NULL, &state);
+	if (ACPI_FAILURE(status))
+		return ACPI_STATE_UNKNOWN;
+
+	return state;
+}
+
+#ifdef CONFIG_PM
+static DEFINE_MUTEX(acpi_pm_notifier_lock);
+static DEFINE_MUTEX(acpi_pm_notifier_install_lock);
+
+void acpi_pm_wakeup_event(struct device *dev)
+{
+	pm_wakeup_dev_event(dev, 0, acpi_s2idle_wakeup());
+}
+EXPORT_SYMBOL_GPL(acpi_pm_wakeup_event);
+
+static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used)
+{
+	struct acpi_device *adev;
+
+	if (val != ACPI_NOTIFY_DEVICE_WAKE)
+		return;
+
+	acpi_handle_debug(handle, "Wake notify\n");
+
+	adev = acpi_get_acpi_dev(handle);
+	if (!adev)
+		return;
+
+	mutex_lock(&acpi_pm_notifier_lock);
+
+	if (adev->wakeup.flags.notifier_present) {
+		pm_wakeup_ws_event(adev->wakeup.ws, 0, acpi_s2idle_wakeup());
+		if (adev->wakeup.context.func) {
+			acpi_handle_debug(handle, "Running %pS for %s\n",
+					  adev->wakeup.context.func,
+					  dev_name(adev->wakeup.context.dev));
+			adev->wakeup.context.func(&adev->wakeup.context);
+		}
+	}
+
+	mutex_unlock(&acpi_pm_notifier_lock);
+
+	acpi_put_acpi_dev(adev);
+}
+
+/**
+ * acpi_add_pm_notifier - Register PM notify handler for given ACPI device.
+ * @adev: ACPI device to add the notify handler for.
+ * @dev: Device to generate a wakeup event for while handling the notification.
+ * @func: Work function to execute when handling the notification.
+ *
+ * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
+ * PM wakeup events.  For example, wakeup events may be generated for bridges
+ * if one of the devices below the bridge is signaling wakeup, even if the
+ * bridge itself doesn't have a wakeup GPE associated with it.
+ */
+acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,
+			void (*func)(struct acpi_device_wakeup_context *context))
+{
+	acpi_status status = AE_ALREADY_EXISTS;
+
+	if (!dev && !func)
+		return AE_BAD_PARAMETER;
+
+	mutex_lock(&acpi_pm_notifier_install_lock);
+
+	if (adev->wakeup.flags.notifier_present)
+		goto out;
+
+	status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY,
+					     acpi_pm_notify_handler, NULL);
+	if (ACPI_FAILURE(status))
+		goto out;
+
+	mutex_lock(&acpi_pm_notifier_lock);
+	adev->wakeup.ws = wakeup_source_register(&adev->dev,
+						 dev_name(&adev->dev));
+	adev->wakeup.context.dev = dev;
+	adev->wakeup.context.func = func;
+	adev->wakeup.flags.notifier_present = true;
+	mutex_unlock(&acpi_pm_notifier_lock);
+
+ out:
+	mutex_unlock(&acpi_pm_notifier_install_lock);
+	return status;
+}
+
+/**
+ * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
+ * @adev: ACPI device to remove the notifier from.
+ */
+acpi_status acpi_remove_pm_notifier(struct acpi_device *adev)
+{
+	acpi_status status = AE_BAD_PARAMETER;
+
+	mutex_lock(&acpi_pm_notifier_install_lock);
+
+	if (!adev->wakeup.flags.notifier_present)
+		goto out;
+
+	status = acpi_remove_notify_handler(adev->handle,
+					    ACPI_SYSTEM_NOTIFY,
+					    acpi_pm_notify_handler);
+	if (ACPI_FAILURE(status))
+		goto out;
+
+	mutex_lock(&acpi_pm_notifier_lock);
+	adev->wakeup.context.func = NULL;
+	adev->wakeup.context.dev = NULL;
+	wakeup_source_unregister(adev->wakeup.ws);
+	adev->wakeup.flags.notifier_present = false;
+	mutex_unlock(&acpi_pm_notifier_lock);
+
+ out:
+	mutex_unlock(&acpi_pm_notifier_install_lock);
+	return status;
+}
+
+bool acpi_bus_can_wakeup(acpi_handle handle)
+{
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
+
+	return device && device->wakeup.flags.valid;
+}
+EXPORT_SYMBOL(acpi_bus_can_wakeup);
+
+bool acpi_pm_device_can_wakeup(struct device *dev)
+{
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+
+	return adev ? acpi_device_can_wakeup(adev) : false;
+}
+
+/**
+ * acpi_dev_pm_get_state - Get preferred power state of ACPI device.
+ * @dev: Device whose preferred target power state to return.
+ * @adev: ACPI device node corresponding to @dev.
+ * @target_state: System state to match the resultant device state.
+ * @d_min_p: Location to store the highest power state available to the device.
+ * @d_max_p: Location to store the lowest power state available to the device.
+ *
+ * Find the lowest power (highest number) and highest power (lowest number) ACPI
+ * device power states that the device can be in while the system is in the
+ * state represented by @target_state.  Store the integer numbers representing
+ * those stats in the memory locations pointed to by @d_max_p and @d_min_p,
+ * respectively.
+ *
+ * Callers must ensure that @dev and @adev are valid pointers and that @adev
+ * actually corresponds to @dev before using this function.
+ *
+ * Returns 0 on success or -ENODATA when one of the ACPI methods fails or
+ * returns a value that doesn't make sense.  The memory locations pointed to by
+ * @d_max_p and @d_min_p are only modified on success.
+ */
+static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev,
+				 u32 target_state, int *d_min_p, int *d_max_p)
+{
+	char method[] = { '_', 'S', '0' + target_state, 'D', '\0' };
+	acpi_handle handle = adev->handle;
+	unsigned long long ret;
+	int d_min, d_max;
+	bool wakeup = false;
+	bool has_sxd = false;
+	acpi_status status;
+
+	/*
+	 * If the system state is S0, the lowest power state the device can be
+	 * in is D3cold, unless the device has _S0W and is supposed to signal
+	 * wakeup, in which case the return value of _S0W has to be used as the
+	 * lowest power state available to the device.
+	 */
+	d_min = ACPI_STATE_D0;
+	d_max = ACPI_STATE_D3_COLD;
+
+	/*
+	 * If present, _SxD methods return the minimum D-state (highest power
+	 * state) we can use for the corresponding S-states.  Otherwise, the
+	 * minimum D-state is D0 (ACPI 3.x).
+	 */
+	if (target_state > ACPI_STATE_S0) {
+		/*
+		 * We rely on acpi_evaluate_integer() not clobbering the integer
+		 * provided if AE_NOT_FOUND is returned.
+		 */
+		ret = d_min;
+		status = acpi_evaluate_integer(handle, method, NULL, &ret);
+		if ((ACPI_FAILURE(status) && status != AE_NOT_FOUND)
+		    || ret > ACPI_STATE_D3_COLD)
+			return -ENODATA;
+
+		/*
+		 * We need to handle legacy systems where D3hot and D3cold are
+		 * the same and 3 is returned in both cases, so fall back to
+		 * D3cold if D3hot is not a valid state.
+		 */
+		if (!adev->power.states[ret].flags.valid) {
+			if (ret == ACPI_STATE_D3_HOT)
+				ret = ACPI_STATE_D3_COLD;
+			else
+				return -ENODATA;
+		}
+
+		if (status == AE_OK)
+			has_sxd = true;
+
+		d_min = ret;
+		wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
+			&& adev->wakeup.sleep_state >= target_state;
+	} else if (device_may_wakeup(dev) && dev->power.wakeirq) {
+		/*
+		 * The ACPI subsystem doesn't manage the wake bit for IRQs
+		 * defined with ExclusiveAndWake and SharedAndWake. Instead we
+		 * expect them to be managed via the PM subsystem. Drivers
+		 * should call dev_pm_set_wake_irq to register an IRQ as a wake
+		 * source.
+		 *
+		 * If a device has a wake IRQ attached we need to check the
+		 * _S0W method to get the correct wake D-state. Otherwise we
+		 * end up putting the device into D3Cold which will more than
+		 * likely disable wake functionality.
+		 */
+		wakeup = true;
+	} else {
+		/* ACPI GPE is specified in _PRW. */
+		wakeup = adev->wakeup.flags.valid;
+	}
+
+	/*
+	 * If _PRW says we can wake up the system from the target sleep state,
+	 * the D-state returned by _SxD is sufficient for that (we assume a
+	 * wakeup-aware driver if wake is set).  Still, if _SxW exists
+	 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
+	 * can wake the system.  _S0W may be valid, too.
+	 */
+	if (wakeup) {
+		method[3] = 'W';
+		status = acpi_evaluate_integer(handle, method, NULL, &ret);
+		if (status == AE_NOT_FOUND) {
+			/* No _SxW. In this case, the ACPI spec says that we
+			 * must not go into any power state deeper than the
+			 * value returned from _SxD.
+			 */
+			if (has_sxd && target_state > ACPI_STATE_S0)
+				d_max = d_min;
+		} else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) {
+			/* Fall back to D3cold if ret is not a valid state. */
+			if (!adev->power.states[ret].flags.valid)
+				ret = ACPI_STATE_D3_COLD;
+
+			d_max = ret > d_min ? ret : d_min;
+		} else {
+			return -ENODATA;
+		}
+	}
+
+	if (d_min_p)
+		*d_min_p = d_min;
+
+	if (d_max_p)
+		*d_max_p = d_max;
+
+	return 0;
+}
+
+/**
+ * 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, -EINVAL if @d_max_in is
+ * incorrect, or -ENODATA on ACPI method 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)
+{
+	struct acpi_device *adev;
+	int ret, d_min, d_max;
+
+	if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD)
+		return -EINVAL;
+
+	if (d_max_in > ACPI_STATE_D2) {
+		enum pm_qos_flags_status stat;
+
+		stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF);
+		if (stat == PM_QOS_FLAGS_ALL)
+			d_max_in = ACPI_STATE_D2;
+	}
+
+	adev = ACPI_COMPANION(dev);
+	if (!adev) {
+		dev_dbg(dev, "ACPI companion missing in %s!\n", __func__);
+		return -ENODEV;
+	}
+
+	ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(),
+				    &d_min, &d_max);
+	if (ret)
+		return ret;
+
+	if (d_max_in < d_min)
+		return -EINVAL;
+
+	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;
+		}
+	}
+
+	if (d_min_p)
+		*d_min_p = d_min;
+
+	return d_max;
+}
+EXPORT_SYMBOL(acpi_pm_device_sleep_state);
+
+/**
+ * acpi_pm_notify_work_func - ACPI devices wakeup notification work function.
+ * @context: Device wakeup context.
+ */
+static void acpi_pm_notify_work_func(struct acpi_device_wakeup_context *context)
+{
+	struct device *dev = context->dev;
+
+	if (dev) {
+		pm_wakeup_event(dev, 0);
+		pm_request_resume(dev);
+	}
+}
+
+static DEFINE_MUTEX(acpi_wakeup_lock);
+
+static int __acpi_device_wakeup_enable(struct acpi_device *adev,
+				       u32 target_state)
+{
+	struct acpi_device_wakeup *wakeup = &adev->wakeup;
+	acpi_status status;
+	int error = 0;
+
+	mutex_lock(&acpi_wakeup_lock);
+
+	/*
+	 * If the device wakeup power is already enabled, disable it and enable
+	 * it again in case it depends on the configuration of subordinate
+	 * devices and the conditions have changed since it was enabled last
+	 * time.
+	 */
+	if (wakeup->enable_count > 0)
+		acpi_disable_wakeup_device_power(adev);
+
+	error = acpi_enable_wakeup_device_power(adev, target_state);
+	if (error) {
+		if (wakeup->enable_count > 0) {
+			acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
+			wakeup->enable_count = 0;
+		}
+		goto out;
+	}
+
+	if (wakeup->enable_count > 0)
+		goto inc;
+
+	status = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
+	if (ACPI_FAILURE(status)) {
+		acpi_disable_wakeup_device_power(adev);
+		error = -EIO;
+		goto out;
+	}
+
+	acpi_handle_debug(adev->handle, "GPE%2X enabled for wakeup\n",
+			  (unsigned int)wakeup->gpe_number);
+
+inc:
+	if (wakeup->enable_count < INT_MAX)
+		wakeup->enable_count++;
+	else
+		acpi_handle_info(adev->handle, "Wakeup enable count out of bounds!\n");
+
+out:
+	mutex_unlock(&acpi_wakeup_lock);
+	return error;
+}
+
+/**
+ * acpi_device_wakeup_enable - Enable wakeup functionality for device.
+ * @adev: ACPI device to enable wakeup functionality for.
+ * @target_state: State the system is transitioning into.
+ *
+ * Enable the GPE associated with @adev so that it can generate wakeup signals
+ * for the device in response to external (remote) events and enable wakeup
+ * power for it.
+ *
+ * Callers must ensure that @adev is a valid ACPI device node before executing
+ * this function.
+ */
+static int acpi_device_wakeup_enable(struct acpi_device *adev, u32 target_state)
+{
+	return __acpi_device_wakeup_enable(adev, target_state);
+}
+
+/**
+ * acpi_device_wakeup_disable - Disable wakeup functionality for device.
+ * @adev: ACPI device to disable wakeup functionality for.
+ *
+ * Disable the GPE associated with @adev and disable wakeup power for it.
+ *
+ * Callers must ensure that @adev is a valid ACPI device node before executing
+ * this function.
+ */
+static void acpi_device_wakeup_disable(struct acpi_device *adev)
+{
+	struct acpi_device_wakeup *wakeup = &adev->wakeup;
+
+	mutex_lock(&acpi_wakeup_lock);
+
+	if (!wakeup->enable_count)
+		goto out;
+
+	acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
+	acpi_disable_wakeup_device_power(adev);
+
+	wakeup->enable_count--;
+
+out:
+	mutex_unlock(&acpi_wakeup_lock);
+}
+
+/**
+ * acpi_pm_set_device_wakeup - Enable/disable remote wakeup for given device.
+ * @dev: Device to enable/disable to generate wakeup events.
+ * @enable: Whether to enable or disable the wakeup functionality.
+ */
+int acpi_pm_set_device_wakeup(struct device *dev, bool enable)
+{
+	struct acpi_device *adev;
+	int error;
+
+	adev = ACPI_COMPANION(dev);
+	if (!adev) {
+		dev_dbg(dev, "ACPI companion missing in %s!\n", __func__);
+		return -ENODEV;
+	}
+
+	if (!acpi_device_can_wakeup(adev))
+		return -EINVAL;
+
+	if (!enable) {
+		acpi_device_wakeup_disable(adev);
+		dev_dbg(dev, "Wakeup disabled by ACPI\n");
+		return 0;
+	}
+
+	error = __acpi_device_wakeup_enable(adev, acpi_target_system_state());
+	if (!error)
+		dev_dbg(dev, "Wakeup enabled by ACPI\n");
+
+	return error;
+}
+EXPORT_SYMBOL_GPL(acpi_pm_set_device_wakeup);
+
+/**
+ * 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 ret, state;
+
+	if (!acpi_device_power_manageable(adev))
+		return 0;
+
+	ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state);
+	return ret ? ret : acpi_device_set_power(adev, 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;
+}
+
+/**
+ * acpi_dev_suspend - Put device into a low-power state using ACPI.
+ * @dev: Device to put into a low-power state.
+ * @wakeup: Whether or not to enable wakeup for the device.
+ *
+ * Put the given device into a 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_suspend(struct device *dev, bool wakeup)
+{
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+	u32 target_state = acpi_target_system_state();
+	int error;
+
+	if (!adev)
+		return 0;
+
+	if (wakeup && acpi_device_can_wakeup(adev)) {
+		error = acpi_device_wakeup_enable(adev, target_state);
+		if (error)
+			return -EAGAIN;
+	} else {
+		wakeup = false;
+	}
+
+	error = acpi_dev_pm_low_power(dev, adev, target_state);
+	if (error && wakeup)
+		acpi_device_wakeup_disable(adev);
+
+	return error;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_suspend);
+
+/**
+ * acpi_dev_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.  Set the power state of the device to ACPI D0 and disable wakeup.
+ */
+int acpi_dev_resume(struct device *dev)
+{
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+	int error;
+
+	if (!adev)
+		return 0;
+
+	error = acpi_dev_pm_full_power(adev);
+	acpi_device_wakeup_disable(adev);
+	return error;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_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_suspend(dev, true);
+}
+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_resume(dev);
+
+	return ret ? ret : pm_generic_runtime_resume(dev);
+}
+EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume);
+
+#ifdef CONFIG_PM_SLEEP
+static bool acpi_dev_needs_resume(struct device *dev, struct acpi_device *adev)
+{
+	u32 sys_target = acpi_target_system_state();
+	int ret, state;
+
+	if (!pm_runtime_suspended(dev) || !adev || (adev->wakeup.flags.valid &&
+	    device_may_wakeup(dev) != !!adev->wakeup.prepare_count))
+		return true;
+
+	if (sys_target == ACPI_STATE_S0)
+		return false;
+
+	if (adev->power.flags.dsw_present)
+		return true;
+
+	ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state);
+	if (ret)
+		return true;
+
+	return state != adev->power.state;
+}
+
+/**
+ * acpi_subsys_prepare - Prepare device for system transition to a sleep state.
+ * @dev: Device to prepare.
+ */
+int acpi_subsys_prepare(struct device *dev)
+{
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+
+	if (dev->driver && dev->driver->pm && dev->driver->pm->prepare) {
+		int ret = dev->driver->pm->prepare(dev);
+
+		if (ret < 0)
+			return ret;
+
+		if (!ret && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
+			return 0;
+	}
+
+	return !acpi_dev_needs_resume(dev, adev);
+}
+EXPORT_SYMBOL_GPL(acpi_subsys_prepare);
+
+/**
+ * acpi_subsys_complete - Finalize device's resume during system resume.
+ * @dev: Device to handle.
+ */
+void acpi_subsys_complete(struct device *dev)
+{
+	pm_generic_complete(dev);
+	/*
+	 * If the device had been runtime-suspended before the system went into
+	 * the sleep state it is going out of and it has never been resumed till
+	 * now, resume it in case the firmware powered it up.
+	 */
+	if (pm_runtime_suspended(dev) && pm_resume_via_firmware())
+		pm_request_resume(dev);
+}
+EXPORT_SYMBOL_GPL(acpi_subsys_complete);
+
+/**
+ * acpi_subsys_suspend - Run the device driver's suspend callback.
+ * @dev: Device to handle.
+ *
+ * Follow PCI and resume devices from runtime suspend before running their
+ * system suspend callbacks, unless the driver can cope with runtime-suspended
+ * devices during system suspend and there are no ACPI-specific reasons for
+ * resuming them.
+ */
+int acpi_subsys_suspend(struct device *dev)
+{
+	if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
+	    acpi_dev_needs_resume(dev, ACPI_COMPANION(dev)))
+		pm_runtime_resume(dev);
+
+	return pm_generic_suspend(dev);
+}
+EXPORT_SYMBOL_GPL(acpi_subsys_suspend);
+
+/**
+ * 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;
+
+	if (dev_pm_skip_suspend(dev))
+		return 0;
+
+	ret = pm_generic_suspend_late(dev);
+	return ret ? ret : acpi_dev_suspend(dev, device_may_wakeup(dev));
+}
+EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late);
+
+/**
+ * acpi_subsys_suspend_noirq - Run the device driver's "noirq" suspend callback.
+ * @dev: Device to suspend.
+ */
+int acpi_subsys_suspend_noirq(struct device *dev)
+{
+	int ret;
+
+	if (dev_pm_skip_suspend(dev))
+		return 0;
+
+	ret = pm_generic_suspend_noirq(dev);
+	if (ret)
+		return ret;
+
+	/*
+	 * If the target system sleep state is suspend-to-idle, it is sufficient
+	 * to check whether or not the device's wakeup settings are good for
+	 * runtime PM.  Otherwise, the pm_resume_via_firmware() check will cause
+	 * acpi_subsys_complete() to take care of fixing up the device's state
+	 * anyway, if need be.
+	 */
+	if (device_can_wakeup(dev) && !device_may_wakeup(dev))
+		dev->power.may_skip_resume = false;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_subsys_suspend_noirq);
+
+/**
+ * acpi_subsys_resume_noirq - Run the device driver's "noirq" resume callback.
+ * @dev: Device to handle.
+ */
+static int acpi_subsys_resume_noirq(struct device *dev)
+{
+	if (dev_pm_skip_resume(dev))
+		return 0;
+
+	return pm_generic_resume_noirq(dev);
+}
+
+/**
+ * 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, but only do that if device either defines early resume
+ * handler, or does not define power operations at all. Otherwise powering up
+ * of the device is postponed to the normal resume phase.
+ */
+static int acpi_subsys_resume_early(struct device *dev)
+{
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+	int ret;
+
+	if (dev_pm_skip_resume(dev))
+		return 0;
+
+	if (pm && !pm->resume_early) {
+		dev_dbg(dev, "postponing D0 transition to normal resume stage\n");
+		return 0;
+	}
+
+	ret = acpi_dev_resume(dev);
+	return ret ? ret : pm_generic_resume_early(dev);
+}
+
+/**
+ * acpi_subsys_resume - Resume device using ACPI.
+ * @dev: Device to Resume.
+ *
+ * Use ACPI to put the given device into the full-power state if it has not been
+ * powered up during early resume phase, and carry out the generic resume
+ * procedure for it during system transition into the working state.
+ */
+static int acpi_subsys_resume(struct device *dev)
+{
+	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+	int ret = 0;
+
+	if (!dev_pm_skip_resume(dev) && pm && !pm->resume_early) {
+		dev_dbg(dev, "executing postponed D0 transition\n");
+		ret = acpi_dev_resume(dev);
+	}
+
+	return ret ? ret : pm_generic_resume(dev);
+}
+
+/**
+ * acpi_subsys_freeze - Run the device driver's freeze callback.
+ * @dev: Device to handle.
+ */
+int acpi_subsys_freeze(struct device *dev)
+{
+	/*
+	 * Resume all runtime-suspended devices before creating a snapshot
+	 * image of system memory, because the restore kernel generally cannot
+	 * be expected to always handle them consistently and they need to be
+	 * put into the runtime-active metastate during system resume anyway,
+	 * so it is better to ensure that the state saved in the image will be
+	 * always consistent with that.
+	 */
+	pm_runtime_resume(dev);
+
+	return pm_generic_freeze(dev);
+}
+EXPORT_SYMBOL_GPL(acpi_subsys_freeze);
+
+/**
+ * acpi_subsys_restore_early - Restore device using ACPI.
+ * @dev: Device to restore.
+ */
+int acpi_subsys_restore_early(struct device *dev)
+{
+	int ret = acpi_dev_resume(dev);
+
+	return ret ? ret : pm_generic_restore_early(dev);
+}
+EXPORT_SYMBOL_GPL(acpi_subsys_restore_early);
+
+/**
+ * acpi_subsys_poweroff - Run the device driver's poweroff callback.
+ * @dev: Device to handle.
+ *
+ * Follow PCI and resume devices from runtime suspend before running their
+ * system poweroff callbacks, unless the driver can cope with runtime-suspended
+ * devices during system suspend and there are no ACPI-specific reasons for
+ * resuming them.
+ */
+int acpi_subsys_poweroff(struct device *dev)
+{
+	if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
+	    acpi_dev_needs_resume(dev, ACPI_COMPANION(dev)))
+		pm_runtime_resume(dev);
+
+	return pm_generic_poweroff(dev);
+}
+EXPORT_SYMBOL_GPL(acpi_subsys_poweroff);
+
+/**
+ * acpi_subsys_poweroff_late - Run the device driver's poweroff callback.
+ * @dev: Device to handle.
+ *
+ * Carry out the generic late poweroff procedure for @dev and use ACPI to put
+ * it into a low-power state during system transition into a sleep state.
+ */
+static int acpi_subsys_poweroff_late(struct device *dev)
+{
+	int ret;
+
+	if (dev_pm_skip_suspend(dev))
+		return 0;
+
+	ret = pm_generic_poweroff_late(dev);
+	if (ret)
+		return ret;
+
+	return acpi_dev_suspend(dev, device_may_wakeup(dev));
+}
+
+/**
+ * acpi_subsys_poweroff_noirq - Run the driver's "noirq" poweroff callback.
+ * @dev: Device to suspend.
+ */
+static int acpi_subsys_poweroff_noirq(struct device *dev)
+{
+	if (dev_pm_skip_suspend(dev))
+		return 0;
+
+	return pm_generic_poweroff_noirq(dev);
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static struct dev_pm_domain acpi_general_pm_domain = {
+	.ops = {
+		.runtime_suspend = acpi_subsys_runtime_suspend,
+		.runtime_resume = acpi_subsys_runtime_resume,
+#ifdef CONFIG_PM_SLEEP
+		.prepare = acpi_subsys_prepare,
+		.complete = acpi_subsys_complete,
+		.suspend = acpi_subsys_suspend,
+		.resume = acpi_subsys_resume,
+		.suspend_late = acpi_subsys_suspend_late,
+		.suspend_noirq = acpi_subsys_suspend_noirq,
+		.resume_noirq = acpi_subsys_resume_noirq,
+		.resume_early = acpi_subsys_resume_early,
+		.freeze = acpi_subsys_freeze,
+		.poweroff = acpi_subsys_poweroff,
+		.poweroff_late = acpi_subsys_poweroff_late,
+		.poweroff_noirq = acpi_subsys_poweroff_noirq,
+		.restore_early = acpi_subsys_restore_early,
+#endif
+	},
+};
+
+/**
+ * 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.
+ */
+static void acpi_dev_pm_detach(struct device *dev, bool power_off)
+{
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+
+	if (adev && dev->pm_domain == &acpi_general_pm_domain) {
+		dev_pm_domain_set(dev, NULL);
+		acpi_remove_pm_notifier(adev);
+		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_wakeup_disable(adev);
+			acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
+		}
+	}
+}
+
+/**
+ * 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)
+{
+	/*
+	 * Skip devices whose ACPI companions match the device IDs below,
+	 * because they require special power management handling incompatible
+	 * with the generic ACPI PM domain.
+	 */
+	static const struct acpi_device_id special_pm_ids[] = {
+		ACPI_FAN_DEVICE_IDS,
+		{}
+	};
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+
+	if (!adev || !acpi_match_device_ids(adev, special_pm_ids))
+		return 0;
+
+	/*
+	 * Only attach the power domain to the first device if the
+	 * companion is shared by multiple. This is to prevent doing power
+	 * management twice.
+	 */
+	if (!acpi_device_is_first_physical_node(adev, dev))
+		return 0;
+
+	acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func);
+	dev_pm_domain_set(dev, &acpi_general_pm_domain);
+	if (power_on) {
+		acpi_dev_pm_full_power(adev);
+		acpi_device_wakeup_disable(adev);
+	}
+
+	dev->pm_domain->detach = acpi_dev_pm_detach;
+	return 1;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_pm_attach);
+
+/**
+ * acpi_storage_d3 - Check if D3 should be used in the suspend path
+ * @dev: Device to check
+ *
+ * Return %true if the platform firmware wants @dev to be programmed
+ * into D3hot or D3cold (if supported) in the suspend path, or %false
+ * when there is no specific preference. On some platforms, if this
+ * hint is ignored, @dev may remain unresponsive after suspending the
+ * platform as a whole.
+ *
+ * Although the property has storage in the name it actually is
+ * applied to the PCIe slot and plugging in a non-storage device the
+ * same platform restrictions will likely apply.
+ */
+bool acpi_storage_d3(struct device *dev)
+{
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+	u8 val;
+
+	if (force_storage_d3())
+		return true;
+
+	if (!adev)
+		return false;
+	if (fwnode_property_read_u8(acpi_fwnode_handle(adev), "StorageD3Enable",
+			&val))
+		return false;
+	return val == 1;
+}
+EXPORT_SYMBOL_GPL(acpi_storage_d3);
+
+/**
+ * acpi_dev_state_d0 - Tell if the device is in D0 power state
+ * @dev: Physical device the ACPI power state of which to check
+ *
+ * On a system without ACPI, return true. On a system with ACPI, return true if
+ * the current ACPI power state of the device is D0, or false otherwise.
+ *
+ * Note that the power state of a device is not well-defined after it has been
+ * passed to acpi_device_set_power() and before that function returns, so it is
+ * not valid to ask for the ACPI power state of the device in that time frame.
+ *
+ * This function is intended to be used in a driver's probe or remove
+ * function. See Documentation/firmware-guide/acpi/non-d0-probe.rst for
+ * more information.
+ */
+bool acpi_dev_state_d0(struct device *dev)
+{
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+
+	if (!adev)
+		return true;
+
+	return adev->power.state == ACPI_STATE_D0;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_state_d0);
+
+#endif /* CONFIG_PM */