Merge branch 'acpi-pm' into acpi-cleanup

The following commits depend on the 'acpi-pm' material.

Documentation/ABI/testing/sysfs-devices-power_resources_D0

+What:		/sys/devices/.../power_resources_D0/
+Date:		January 2013
+Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+Description:
+		The /sys/devices/.../power_resources_D0/ directory is only
+		present for device objects representing ACPI device nodes that
+		use ACPI power resources for power management.
+
+		If present, it contains symbolic links to device directories
+		representing ACPI power resources that need to be turned on for
+		the given device node to be in ACPI power state D0.  The names
+		of the links are the same as the names of the directories they
+		point to.

Documentation/ABI/testing/sysfs-devices-power_resources_D1

+What:		/sys/devices/.../power_resources_D1/
+Date:		January 2013
+Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+Description:
+		The /sys/devices/.../power_resources_D1/ directory is only
+		present for device objects representing ACPI device nodes that
+		use ACPI power resources for power management and support ACPI
+		power state D1.
+
+		If present, it contains symbolic links to device directories
+		representing ACPI power resources that need to be turned on for
+		the given device node to be in ACPI power state D1.  The names
+		of the links are the same as the names of the directories they
+		point to.

Documentation/ABI/testing/sysfs-devices-power_resources_D2

+What:		/sys/devices/.../power_resources_D2/
+Date:		January 2013
+Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+Description:
+		The /sys/devices/.../power_resources_D2/ directory is only
+		present for device objects representing ACPI device nodes that
+		use ACPI power resources for power management and support ACPI
+		power state D2.
+
+		If present, it contains symbolic links to device directories
+		representing ACPI power resources that need to be turned on for
+		the given device node to be in ACPI power state D2.  The names
+		of the links are the same as the names of the directories they
+		point to.

Documentation/ABI/testing/sysfs-devices-power_resources_D3hot

+What:		/sys/devices/.../power_resources_D3hot/
+Date:		January 2013
+Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+Description:
+		The /sys/devices/.../power_resources_D3hot/ directory is only
+		present for device objects representing ACPI device nodes that
+		use ACPI power resources for power management and support ACPI
+		power state D3hot.
+
+		If present, it contains symbolic links to device directories
+		representing ACPI power resources that need to be turned on for
+		the given device node to be in ACPI power state D3hot.  The
+		names of the links are the same as the names of the directories
+		they point to.

Documentation/ABI/testing/sysfs-devices-power_state

+What:		/sys/devices/.../power_state
+Date:		January 2013
+Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+Description:
+		The /sys/devices/.../power_state attribute is only present for
+		device objects representing ACPI device nodes that provide power
+		management methods.
+
+		If present, it contains a string representing the current ACPI
+		power state of the given device node.  Its possible values,
+		"D0", "D1", "D2", "D3hot", and "D3cold", reflect the power state
+		names defined by the ACPI specification (ACPI 4 and above).
+
+		If the device node uses shared ACPI power resources, this state
+		determines a list of power resources required not to be turned
+		off.  However, some power resources needed by the device node in
+		higher-power (lower-number) states may also be ON because of
+		some other devices using them at the moment.
+
+		This attribute is read-only.

Documentation/ABI/testing/sysfs-devices-real_power_state

+What:		/sys/devices/.../real_power_state
+Date:		January 2013
+Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+Description:
+		The /sys/devices/.../real_power_state attribute is only present
+		for device objects representing ACPI device nodes that provide
+		power management methods and use ACPI power resources for power
+		management.
+
+		If present, it contains a string representing the real ACPI
+		power state of the given device node as returned by the _PSC
+		control method or inferred from the configuration of power
+		resources.  Its possible values, "D0", "D1", "D2", "D3hot", and
+		"D3cold", reflect the power state names defined by the ACPI
+		specification (ACPI 4 and above).
+
+		In some situations the value of this attribute may be different
+		from the value of the /sys/devices/.../power_state attribute for
+		the same device object.  If that happens, some shared power
+		resources used by the device node are only ON because of some
+		other devices using them at the moment.
+
+		This attribute is read-only.

Documentation/ABI/testing/sysfs-devices-resource_in_use

+What:		/sys/devices/.../resource_in_use
+Date:		January 2013
+Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+Description:
+		The /sys/devices/.../resource_in_use attribute is only present
+		for device objects representing ACPI power resources.
+
+		If present, it contains a number (0 or 1) representing the
+		current status of the given power resource (0 means that the
+		resource is not in use and therefore it has been turned off).
+
+		This attribute is read-only.

drivers/acpi/bus.c

@@ -178,276 +178,6 @@ int acpi_bus_get_private_data(acpi_handle handle, void **data)
 }
 EXPORT_SYMBOL(acpi_bus_get_private_data);
 
-/* --------------------------------------------------------------------------
-                                 Power Management
-   -------------------------------------------------------------------------- */
-
-static const char *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 "D3";
-	default:
-		return "(unknown)";
-	}
-}
-
-static int __acpi_bus_get_power(struct acpi_device *device, int *state)
-{
-	int result = ACPI_STATE_UNKNOWN;
-
-	if (!device || !state)
-		return -EINVAL;
-
-	if (!device->flags.power_manageable) {
-		/* TBD: Non-recursive algorithm for walking up hierarchy. */
-		*state = device->parent ?
-			device->parent->power.state : ACPI_STATE_D0;
-		goto out;
-	}
-
-	/*
-	 * Get the device's power state either directly (via _PSC) or
-	 * indirectly (via power resources).
-	 */
-	if (device->power.flags.explicit_get) {
-		unsigned long long psc;
-		acpi_status status = acpi_evaluate_integer(device->handle,
-							   "_PSC", NULL, &psc);
-		if (ACPI_FAILURE(status))
-			return -ENODEV;
-
-		result = psc;
-	}
-	/* The test below covers ACPI_STATE_UNKNOWN too. */
-	if (result <= ACPI_STATE_D2) {
-	  ; /* Do nothing. */
-	} else if (device->power.flags.power_resources) {
-		int error = acpi_power_get_inferred_state(device, &result);
-		if (error)
-			return error;
-	} else if (result == ACPI_STATE_D3_HOT) {
-		result = ACPI_STATE_D3;
-	}
-
-	/*
-	 * 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.
-	 */
-	if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
-	    && result == ACPI_STATE_D0)
-		device->parent->power.state = ACPI_STATE_D0;
-
-	*state = result;
-
- out:
-	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
-			  device->pnp.bus_id, state_string(*state)));
-
-	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 result = 0;
-	acpi_status status = AE_OK;
-	char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
-
-	if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
-		return -EINVAL;
-
-	/* Make sure this is a valid target state */
-
-	if (state == device->power.state) {
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
-				  state_string(state)));
-		return 0;
-	}
-
-	if (!device->power.states[state].flags.valid) {
-		printk(KERN_WARNING PREFIX "Device does not support %s\n",
-		       state_string(state));
-		return -ENODEV;
-	}
-	if (device->parent && (state < device->parent->power.state)) {
-		printk(KERN_WARNING PREFIX
-			      "Cannot set device to a higher-powered"
-			      " state than parent\n");
-		return -ENODEV;
-	}
-
-	/* For D3cold we should execute _PS3, not _PS4. */
-	if (state == ACPI_STATE_D3_COLD)
-		object_name[3] = '3';
-
-	/*
-	 * Transition Power
-	 * ----------------
-	 * On transitions to a high-powered state we first apply power (via
-	 * power resources) then evalute _PSx.  Conversly for transitions to
-	 * a lower-powered state.
-	 */
-	if (state < device->power.state) {
-		if (device->power.state >= ACPI_STATE_D3_HOT &&
-		    state != ACPI_STATE_D0) {
-			printk(KERN_WARNING PREFIX
-			      "Cannot transition to non-D0 state from D3\n");
-			return -ENODEV;
-		}
-		if (device->power.flags.power_resources) {
-			result = acpi_power_transition(device, state);
-			if (result)
-				goto end;
-		}
-		if (device->power.states[state].flags.explicit_set) {
-			status = acpi_evaluate_object(device->handle,
-						      object_name, NULL, NULL);
-			if (ACPI_FAILURE(status)) {
-				result = -ENODEV;
-				goto end;
-			}
-		}
-	} else {
-		if (device->power.states[state].flags.explicit_set) {
-			status = acpi_evaluate_object(device->handle,
-						      object_name, NULL, NULL);
-			if (ACPI_FAILURE(status)) {
-				result = -ENODEV;
-				goto end;
-			}
-		}
-		if (device->power.flags.power_resources) {
-			result = acpi_power_transition(device, state);
-			if (result)
-				goto end;
-		}
-	}
-
-      end:
-	if (result)
-		printk(KERN_WARNING PREFIX
-			      "Device [%s] failed to transition to %s\n",
-			      device->pnp.bus_id, state_string(state));
-	else {
-		device->power.state = state;
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-				  "Device [%s] transitioned to %s\n",
-				  device->pnp.bus_id, state_string(state)));
-	}
-
-	return result;
-}
-EXPORT_SYMBOL(acpi_device_set_power);
-
-
-int acpi_bus_set_power(acpi_handle handle, int state)
-{
-	struct acpi_device *device;
-	int result;
-
-	result = acpi_bus_get_device(handle, &device);
-	if (result)
-		return result;
-
-	if (!device->flags.power_manageable) {
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-				"Device [%s] is not power manageable\n",
-				dev_name(&device->dev)));
-		return -ENODEV;
-	}
-
-	return acpi_device_set_power(device, state);
-}
-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;
-
-	result = __acpi_bus_get_power(device, &state);
-	if (result)
-		return result;
-
-	if (device->power.flags.power_resources)
-		result = acpi_power_on_resources(device, state);
-
-	if (!result)
-		device->power.state = state;
-
-	return result;
-}
-
-
-int acpi_bus_update_power(acpi_handle handle, int *state_p)
-{
-	struct acpi_device *device;
-	int state;
-	int result;
-
-	result = acpi_bus_get_device(handle, &device);
-	if (result)
-		return result;
-
-	result = __acpi_bus_get_power(device, &state);
-	if (result)
-		return result;
-
-	result = acpi_device_set_power(device, state);
-	if (!result && state_p)
-		*state_p = state;
-
-	return result;
-}
-EXPORT_SYMBOL_GPL(acpi_bus_update_power);
-
-
-bool acpi_bus_power_manageable(acpi_handle handle)
-{
-	struct acpi_device *device;
-	int result;
-
-	result = acpi_bus_get_device(handle, &device);
-	return result ? false : device->flags.power_manageable;
-}
-
-EXPORT_SYMBOL(acpi_bus_power_manageable);
-
-bool acpi_bus_can_wakeup(acpi_handle handle)
-{
-	struct acpi_device *device;
-	int result;
-
-	result = acpi_bus_get_device(handle, &device);
-	return result ? false : device->wakeup.flags.valid;
-}
-
-EXPORT_SYMBOL(acpi_bus_can_wakeup);
-
 static void acpi_print_osc_error(acpi_handle handle,
 	struct acpi_osc_context *context, char *error)
 {

drivers/acpi/device_pm.c

@@ -30,6 +30,12 @@
 
 #include <acpi/acpi.h>
 #include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+#include "internal.h"
+
+#define _COMPONENT	ACPI_POWER_COMPONENT
+ACPI_MODULE_NAME("device_pm");
 
 static DEFINE_MUTEX(acpi_pm_notifier_lock);
 
@@ -93,6 +99,284 @@ acpi_status acpi_remove_pm_notifier(struct acpi_device *adev,
 	return status;
 }
 
+/**
+ * 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)";
+	}
+}
+
+/**
+ * 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).
+ */
+int acpi_device_get_power(struct acpi_device *device, int *state)
+{
+	int result = ACPI_STATE_UNKNOWN;
+
+	if (!device || !state)
+		return -EINVAL;
+
+	if (!device->flags.power_manageable) {
+		/* TBD: Non-recursive algorithm for walking up hierarchy. */
+		*state = device->parent ?
+			device->parent->power.state : ACPI_STATE_D0;
+		goto out;
+	}
+
+	/*
+	 * Get the device's power state either directly (via _PSC) or
+	 * indirectly (via power resources).
+	 */
+	if (device->power.flags.explicit_get) {
+		unsigned long long psc;
+		acpi_status status = acpi_evaluate_integer(device->handle,
+							   "_PSC", NULL, &psc);
+		if (ACPI_FAILURE(status))
+			return -ENODEV;
+
+		result = psc;
+	}
+	/* The test below covers ACPI_STATE_UNKNOWN too. */
+	if (result <= ACPI_STATE_D2) {
+	  ; /* Do nothing. */
+	} else if (device->power.flags.power_resources) {
+		int error = acpi_power_get_inferred_state(device, &result);
+		if (error)
+			return error;
+	} else if (result == ACPI_STATE_D3_HOT) {
+		result = ACPI_STATE_D3;
+	}
+
+	/*
+	 * 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.
+	 */
+	if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
+	    && result == ACPI_STATE_D0)
+		device->parent->power.state = ACPI_STATE_D0;
+
+	*state = result;
+
+ out:
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
+			  device->pnp.bus_id, 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 result = 0;
+	bool cut_power = false;
+
+	if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
+		return -EINVAL;
+
+	/* Make sure this is a valid target state */
+
+	if (state == device->power.state) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
+				  acpi_power_state_string(state)));
+		return 0;
+	}
+
+	if (!device->power.states[state].flags.valid) {
+		printk(KERN_WARNING PREFIX "Device does not support %s\n",
+		       acpi_power_state_string(state));
+		return -ENODEV;
+	}
+	if (device->parent && (state < device->parent->power.state)) {
+		printk(KERN_WARNING PREFIX
+			      "Cannot set device to a higher-powered"
+			      " state than parent\n");
+		return -ENODEV;
+	}
+
+	/* For D3cold we should first transition into D3hot. */
+	if (state == ACPI_STATE_D3_COLD
+	    && device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) {
+		state = ACPI_STATE_D3_HOT;
+		cut_power = true;
+	}
+
+	if (state < device->power.state && state != ACPI_STATE_D0
+	    && device->power.state >= ACPI_STATE_D3_HOT) {
+		printk(KERN_WARNING PREFIX
+			"Cannot transition to non-D0 state from D3\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * Transition Power
+	 * ----------------
+	 * In accordance with the ACPI specification first apply power (via
+	 * power resources) and then evalute _PSx.
+	 */
+	if (device->power.flags.power_resources) {
+		result = acpi_power_transition(device, state);
+		if (result)
+			goto end;
+	}
+	result = acpi_dev_pm_explicit_set(device, state);
+	if (result)
+		goto end;
+
+	if (cut_power) {
+		device->power.state = state;
+		state = ACPI_STATE_D3_COLD;
+		result = acpi_power_transition(device, state);
+	}
+
+ end:
+	if (result) {
+		printk(KERN_WARNING PREFIX
+			      "Device [%s] failed to transition to %s\n",
+			      device->pnp.bus_id,
+			      acpi_power_state_string(state));
+	} else {
+		device->power.state = state;
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+				  "Device [%s] transitioned to %s\n",
+				  device->pnp.bus_id,
+				  acpi_power_state_string(state)));
+	}
+
+	return result;
+}
+EXPORT_SYMBOL(acpi_device_set_power);
+
+int acpi_bus_set_power(acpi_handle handle, int state)
+{
+	struct acpi_device *device;
+	int result;
+
+	result = acpi_bus_get_device(handle, &device);
+	if (result)
+		return result;
+
+	if (!device->flags.power_manageable) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+				"Device [%s] is not power manageable\n",
+				dev_name(&device->dev)));
+		return -ENODEV;
+	}
+
+	return acpi_device_set_power(device, state);
+}
+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;
+
+	result = acpi_device_get_power(device, &state);
+	if (result)
+		return result;
+
+	if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) {
+		result = acpi_power_on_resources(device, state);
+		if (result)
+			return result;
+
+		result = acpi_dev_pm_explicit_set(device, state);
+		if (result)
+			return result;
+	}
+	device->power.state = state;
+	return 0;
+}
+
+int acpi_bus_update_power(acpi_handle handle, int *state_p)
+{
+	struct acpi_device *device;
+	int state;
+	int result;
+
+	result = acpi_bus_get_device(handle, &device);
+	if (result)
+		return result;
+
+	result = acpi_device_get_power(device, &state);
+	if (result)
+		return result;
+
+	result = acpi_device_set_power(device, state);
+	if (!result && state_p)
+		*state_p = state;
+
+	return result;
+}
+EXPORT_SYMBOL_GPL(acpi_bus_update_power);
+
+bool acpi_bus_power_manageable(acpi_handle handle)
+{
+	struct acpi_device *device;
+	int result;
+
+	result = acpi_bus_get_device(handle, &device);
+	return result ? false : device->flags.power_manageable;
+}
+EXPORT_SYMBOL(acpi_bus_power_manageable);
+
+bool acpi_bus_can_wakeup(acpi_handle handle)
+{
+	struct acpi_device *device;
+	int result;
+
+	result = acpi_bus_get_device(handle, &device);
+	return result ? false : device->wakeup.flags.valid;
+}
+EXPORT_SYMBOL(acpi_bus_can_wakeup);
+
 /**
  * acpi_device_power_state - Get preferred power state of ACPI device.
  * @dev: Device whose preferred target power state to return.
@@ -304,7 +588,7 @@ static inline void acpi_wakeup_device(acpi_handle handle, u32 event,
 				      void *context) {}
 #endif /* CONFIG_PM_RUNTIME */
 
- #ifdef CONFIG_PM_SLEEP
+#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.
@@ -665,3 +949,59 @@ void acpi_dev_pm_detach(struct device *dev, bool power_off)
 	}
 }
 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);

drivers/acpi/internal.h

@@ -34,16 +34,34 @@ int acpi_debugfs_init(void);
 static inline void acpi_debugfs_init(void) { return; }
 #endif
 
+/* --------------------------------------------------------------------------
+                     Device Node Initialization / Removal
+   -------------------------------------------------------------------------- */
+#define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
+			  ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
+
+int acpi_device_add(struct acpi_device *device,
+		    void (*release)(struct device *));
+void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
+			     int type, unsigned long long sta);
+void acpi_device_add_finalize(struct acpi_device *device);
+void acpi_free_ids(struct acpi_device *device);
+
 /* --------------------------------------------------------------------------
                                   Power Resource
    -------------------------------------------------------------------------- */
 int acpi_power_init(void);
+void acpi_power_resources_list_free(struct list_head *list);
+int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
+				 struct list_head *list);
+int acpi_add_power_resource(acpi_handle handle);
+void acpi_power_add_remove_device(struct acpi_device *adev, bool add);
+int acpi_power_min_system_level(struct list_head *list);
 int acpi_device_sleep_wake(struct acpi_device *dev,
                            int enable, int sleep_state, int dev_state);
 int acpi_power_get_inferred_state(struct acpi_device *device, int *state);
 int acpi_power_on_resources(struct acpi_device *device, int state);
 int acpi_power_transition(struct acpi_device *device, int state);
-int acpi_bus_init_power(struct acpi_device *device);
 
 int acpi_wakeup_device_init(void);
 void acpi_early_processor_set_pdc(void);

drivers/acpi/proc.c

@@ -311,11 +311,12 @@ acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
 			   dev->pnp.bus_id,
 			   (u32) dev->wakeup.sleep_state);
 
-		if (!dev->physical_node_count)
+		if (!dev->physical_node_count) {
 			seq_printf(seq, "%c%-8s\n",
-				dev->wakeup.flags.run_wake ?
-				'*' : ' ', "disabled");
-		else {
+				dev->wakeup.flags.run_wake ? '*' : ' ',
+				device_may_wakeup(&dev->dev) ?
+					"enabled" : "disabled");
+		} else {
 			struct device *ldev;
 			list_for_each_entry(entry, &dev->physical_node_list,
 					node) {

drivers/acpi/sleep.c

@@ -386,6 +386,8 @@ static void acpi_pm_finish(void)
 
 	acpi_target_sleep_state = ACPI_STATE_S0;
 
+	acpi_resume_power_resources();
+
 	/* If we were woken with the fixed power button, provide a small
 	 * hint to userspace in the form of a wakeup event on the fixed power
 	 * button device (if it can be found).
@@ -577,7 +579,28 @@ static const struct platform_suspend_ops acpi_suspend_ops_old = {
 	.end = acpi_pm_end,
 	.recover = acpi_pm_finish,
 };
-#endif /* CONFIG_SUSPEND */
+
+static void acpi_sleep_suspend_setup(void)
+{
+	int i;
+
+	for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
+		acpi_status status;
+		u8 type_a, type_b;
+
+		status = acpi_get_sleep_type_data(i, &type_a, &type_b);
+		if (ACPI_SUCCESS(status)) {
+			sleep_states[i] = 1;
+			pr_cont(" S%d", i);
+		}
+	}
+
+	suspend_set_ops(old_suspend_ordering ?
+		&acpi_suspend_ops_old : &acpi_suspend_ops);
+}
+#else /* !CONFIG_SUSPEND */
+static inline void acpi_sleep_suspend_setup(void) {}
+#endif /* !CONFIG_SUSPEND */
 
 #ifdef CONFIG_HIBERNATION
 static unsigned long s4_hardware_signature;
@@ -698,7 +721,30 @@ static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
 	.restore_cleanup = acpi_pm_thaw,
 	.recover = acpi_pm_finish,
 };
-#endif /* CONFIG_HIBERNATION */
+
+static void acpi_sleep_hibernate_setup(void)
+{
+	acpi_status status;
+	u8 type_a, type_b;
+
+	status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
+	if (ACPI_FAILURE(status))
+		return;
+
+	hibernation_set_ops(old_suspend_ordering ?
+			&acpi_hibernation_ops_old : &acpi_hibernation_ops);
+	sleep_states[ACPI_STATE_S4] = 1;
+	pr_cont(KERN_CONT " S4");
+	if (nosigcheck)
+		return;
+
+	acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
+	if (facs)
+		s4_hardware_signature = facs->hardware_signature;
+}
+#else /* !CONFIG_HIBERNATION */
+static inline void acpi_sleep_hibernate_setup(void) {}
+#endif /* !CONFIG_HIBERNATION */
 
 int acpi_suspend(u32 acpi_state)
 {
@@ -734,9 +780,6 @@ int __init acpi_sleep_init(void)
 {
 	acpi_status status;
 	u8 type_a, type_b;
-#ifdef CONFIG_SUSPEND
-	int i = 0;
-#endif
 
 	if (acpi_disabled)
 		return 0;
@@ -744,45 +787,19 @@ int __init acpi_sleep_init(void)
 	acpi_sleep_dmi_check();
 
 	sleep_states[ACPI_STATE_S0] = 1;
-	printk(KERN_INFO PREFIX "(supports S0");
+	pr_info(PREFIX "(supports S0");
 
-#ifdef CONFIG_SUSPEND
-	for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
-		status = acpi_get_sleep_type_data(i, &type_a, &type_b);
-		if (ACPI_SUCCESS(status)) {
-			sleep_states[i] = 1;
-			printk(KERN_CONT " S%d", i);
-		}
-	}
+	acpi_sleep_suspend_setup();
+	acpi_sleep_hibernate_setup();
 
-	suspend_set_ops(old_suspend_ordering ?
-		&acpi_suspend_ops_old : &acpi_suspend_ops);
-#endif
-
-#ifdef CONFIG_HIBERNATION
-	status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
-	if (ACPI_SUCCESS(status)) {
-		hibernation_set_ops(old_suspend_ordering ?
-			&acpi_hibernation_ops_old : &acpi_hibernation_ops);
-		sleep_states[ACPI_STATE_S4] = 1;
-		printk(KERN_CONT " S4");
-		if (!nosigcheck) {
-			acpi_get_table(ACPI_SIG_FACS, 1,
-				(struct acpi_table_header **)&facs);
-			if (facs)
-				s4_hardware_signature =
-					facs->hardware_signature;
-		}
-	}
-#endif
 	status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
 	if (ACPI_SUCCESS(status)) {
 		sleep_states[ACPI_STATE_S5] = 1;
-		printk(KERN_CONT " S5");
+		pr_cont(" S5");
 		pm_power_off_prepare = acpi_power_off_prepare;
 		pm_power_off = acpi_power_off;
 	}
-	printk(KERN_CONT ")\n");
+	pr_cont(")\n");
 	/*
 	 * Register the tts_notifier to reboot notifier list so that the _TTS
 	 * object can also be evaluated when the system enters S5.

drivers/acpi/sleep.h

@@ -6,3 +6,5 @@ extern void acpi_disable_wakeup_devices(u8 sleep_state);
 
 extern struct list_head acpi_wakeup_device_list;
 extern struct mutex acpi_device_lock;
+
+extern void acpi_resume_power_resources(void);

drivers/ata/libata-acpi.c

@@ -1029,30 +1029,20 @@ static void ata_acpi_register_power_resource(struct ata_device *dev)
 {
 	struct scsi_device *sdev = dev->sdev;
 	acpi_handle handle;
-	struct device *device;
 
 	handle = ata_dev_acpi_handle(dev);
-	if (!handle)
-		return;
-
-	device = &sdev->sdev_gendev;
-
-	acpi_power_resource_register_device(device, handle);
+	if (handle)
+		acpi_dev_pm_remove_dependent(handle, &sdev->sdev_gendev);
 }
 
 static void ata_acpi_unregister_power_resource(struct ata_device *dev)
 {
 	struct scsi_device *sdev = dev->sdev;
 	acpi_handle handle;
-	struct device *device;
 
 	handle = ata_dev_acpi_handle(dev);
-	if (!handle)
-		return;
-
-	device = &sdev->sdev_gendev;
-
-	acpi_power_resource_unregister_device(device, handle);
+	if (handle)
+		acpi_dev_pm_remove_dependent(handle, &sdev->sdev_gendev);
 }
 
 void ata_acpi_bind(struct ata_device *dev)

drivers/pci/pci-acpi.c

@@ -345,7 +345,6 @@ static void pci_acpi_setup(struct device *dev)
 		acpi_pci_irq_add_prt(handle, pci_domain_nr(pci_dev->bus), bus);
 	}
 
-	acpi_power_resource_register_device(dev, handle);
 	if (acpi_bus_get_device(handle, &adev) || !adev->wakeup.flags.valid)
 		return;
 
@@ -368,7 +367,6 @@ static void pci_acpi_cleanup(struct device *dev)
 		device_set_run_wake(dev, false);
 		pci_acpi_remove_pm_notifier(adev);
 	}
-	acpi_power_resource_unregister_device(dev, handle);
 
 	if (pci_dev->subordinate)
 		acpi_pci_irq_del_prt(pci_domain_nr(pci_dev->bus),

fs/sysfs/group.c

@@ -205,6 +205,48 @@ void sysfs_unmerge_group(struct kobject *kobj,
 }
 EXPORT_SYMBOL_GPL(sysfs_unmerge_group);
 
+/**
+ * sysfs_add_link_to_group - add a symlink to an attribute group.
+ * @kobj:	The kobject containing the group.
+ * @group_name:	The name of the group.
+ * @target:	The target kobject of the symlink to create.
+ * @link_name:	The name of the symlink to create.
+ */
+int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name,
+			    struct kobject *target, const char *link_name)
+{
+	struct sysfs_dirent *dir_sd;
+	int error = 0;
+
+	dir_sd = sysfs_get_dirent(kobj->sd, NULL, group_name);
+	if (!dir_sd)
+		return -ENOENT;
+
+	error = sysfs_create_link_sd(dir_sd, target, link_name);
+	sysfs_put(dir_sd);
+
+	return error;
+}
+EXPORT_SYMBOL_GPL(sysfs_add_link_to_group);
+
+/**
+ * sysfs_remove_link_from_group - remove a symlink from an attribute group.
+ * @kobj:	The kobject containing the group.
+ * @group_name:	The name of the group.
+ * @link_name:	The name of the symlink to remove.
+ */
+void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
+				  const char *link_name)
+{
+	struct sysfs_dirent *dir_sd;
+
+	dir_sd = sysfs_get_dirent(kobj->sd, NULL, group_name);
+	if (dir_sd) {
+		sysfs_hash_and_remove(dir_sd, NULL, link_name);
+		sysfs_put(dir_sd);
+	}
+}
+EXPORT_SYMBOL_GPL(sysfs_remove_link_from_group);
 
 EXPORT_SYMBOL_GPL(sysfs_create_group);
 EXPORT_SYMBOL_GPL(sysfs_update_group);

fs/sysfs/symlink.c

@@ -21,26 +21,17 @@
 
 #include "sysfs.h"
 
-static int sysfs_do_create_link(struct kobject *kobj, struct kobject *target,
-				const char *name, int warn)
+static int sysfs_do_create_link_sd(struct sysfs_dirent *parent_sd,
+				   struct kobject *target,
+				   const char *name, int warn)
 {
-	struct sysfs_dirent *parent_sd = NULL;
 	struct sysfs_dirent *target_sd = NULL;
 	struct sysfs_dirent *sd = NULL;
 	struct sysfs_addrm_cxt acxt;
 	enum kobj_ns_type ns_type;
 	int error;
 
-	BUG_ON(!name);
-
-	if (!kobj)
-		parent_sd = &sysfs_root;
-	else
-		parent_sd = kobj->sd;
-
-	error = -EFAULT;
-	if (!parent_sd)
-		goto out_put;
+	BUG_ON(!name || !parent_sd);
 
 	/* target->sd can go away beneath us but is protected with
 	 * sysfs_assoc_lock.  Fetch target_sd from it.
@@ -95,6 +86,34 @@ static int sysfs_do_create_link(struct kobject *kobj, struct kobject *target,
 	return error;
 }
 
+/**
+ *	sysfs_create_link_sd - create symlink to a given object.
+ *	@sd:		directory we're creating the link in.
+ *	@target:	object we're pointing to.
+ *	@name:		name of the symlink.
+ */
+int sysfs_create_link_sd(struct sysfs_dirent *sd, struct kobject *target,
+			 const char *name)
+{
+	return sysfs_do_create_link_sd(sd, target, name, 1);
+}
+
+static int sysfs_do_create_link(struct kobject *kobj, struct kobject *target,
+				const char *name, int warn)
+{
+	struct sysfs_dirent *parent_sd = NULL;
+
+	if (!kobj)
+		parent_sd = &sysfs_root;
+	else
+		parent_sd = kobj->sd;
+
+	if (!parent_sd)
+		return -EFAULT;
+
+	return sysfs_do_create_link_sd(parent_sd, target, name, warn);
+}
+
 /**
  *	sysfs_create_link - create symlink between two objects.
  *	@kobj:	object whose directory we're creating the link in.

fs/sysfs/sysfs.h

@@ -240,3 +240,5 @@ void unmap_bin_file(struct sysfs_dirent *attr_sd);
  * symlink.c
  */
 extern const struct inode_operations sysfs_symlink_inode_operations;
+int sysfs_create_link_sd(struct sysfs_dirent *sd, struct kobject *target,
+			 const char *name);

include/acpi/acpi_bus.h

@@ -197,7 +197,7 @@ struct acpi_device_power_state {
 	} flags;
 	int power;		/* % Power (compared to D0) */
 	int latency;		/* Dx->D0 time (microseconds) */
-	struct acpi_handle_list resources;	/* Power resources referenced */
+	struct list_head resources;	/* Power resources referenced */
 };
 
 struct acpi_device_power {
@@ -240,7 +240,7 @@ struct acpi_device_wakeup {
 	acpi_handle gpe_device;
 	u64 gpe_number;
 	u64 sleep_state;
-	struct acpi_handle_list resources;
+	struct list_head resources;
 	struct acpi_device_wakeup_flags flags;
 	int prepare_count;
 };
@@ -277,6 +277,8 @@ struct acpi_device {
 	struct list_head physical_node_list;
 	struct mutex physical_node_lock;
 	DECLARE_BITMAP(physical_node_id_bitmap, ACPI_MAX_PHYSICAL_NODE);
+	struct list_head power_dependent;
+	void (*remove)(struct acpi_device *);
 };
 
 static inline void *acpi_driver_data(struct acpi_device *d)
@@ -327,13 +329,51 @@ void acpi_bus_data_handler(acpi_handle handle, void *context);
 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 				       unsigned long long *sta);
 int acpi_bus_get_status(struct acpi_device *device);
+
+#ifdef CONFIG_PM
 int acpi_bus_set_power(acpi_handle handle, int state);
+const char *acpi_power_state_string(int state);
+int acpi_device_get_power(struct acpi_device *device, int *state);
 int acpi_device_set_power(struct acpi_device *device, int state);
+int acpi_bus_init_power(struct acpi_device *device);
 int acpi_bus_update_power(acpi_handle handle, int *state_p);
 bool acpi_bus_power_manageable(acpi_handle handle);
 bool acpi_bus_can_wakeup(acpi_handle handle);
-int acpi_power_resource_register_device(struct device *dev, acpi_handle handle);
-void acpi_power_resource_unregister_device(struct device *dev, acpi_handle handle);
+#else /* !CONFIG_PM */
+static inline int acpi_bus_set_power(acpi_handle handle, int state)
+{
+	return 0;
+}
+static inline const char *acpi_power_state_string(int state)
+{
+	return "D0";
+}
+static inline int acpi_device_get_power(struct acpi_device *device, int *state)
+{
+	return 0;
+}
+static inline int acpi_device_set_power(struct acpi_device *device, int state)
+{
+	return 0;
+}
+static inline int acpi_bus_init_power(struct acpi_device *device)
+{
+	return 0;
+}
+static inline int acpi_bus_update_power(acpi_handle handle, int *state_p)
+{
+	return 0;
+}
+static inline bool acpi_bus_power_manageable(acpi_handle handle)
+{
+	return false;
+}
+static inline bool acpi_bus_can_wakeup(acpi_handle handle)
+{
+	return false;
+}
+#endif /* !CONFIG_PM */
+
 #ifdef CONFIG_ACPI_PROC_EVENT
 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data);
 int acpi_bus_generate_proc_event4(const char *class, const char *bid, u8 type, int data);
@@ -412,6 +452,8 @@ acpi_status acpi_remove_pm_notifier(struct acpi_device *adev,
 int acpi_device_power_state(struct device *dev, struct acpi_device *adev,
 			    u32 target_state, int d_max_in, int *d_min_p);
 int acpi_pm_device_sleep_state(struct device *, int *, int);
+void acpi_dev_pm_add_dependent(acpi_handle handle, struct device *depdev);
+void acpi_dev_pm_remove_dependent(acpi_handle handle, struct device *depdev);
 #else
 static inline acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
 					       acpi_notify_handler handler,
@@ -441,6 +483,10 @@ static inline int acpi_pm_device_sleep_state(struct device *d, int *p, int m)
 {
 	return __acpi_device_power_state(m, p);
 }
+static inline void acpi_dev_pm_add_dependent(acpi_handle handle,
+					     struct device *depdev) {}
+static inline void acpi_dev_pm_remove_dependent(acpi_handle handle,
+						struct device *depdev) {}
 #endif
 
 #ifdef CONFIG_PM_RUNTIME

include/linux/acpi.h

@@ -511,7 +511,7 @@ static inline int acpi_subsys_runtime_suspend(struct device *dev) { return 0; }
 static inline int acpi_subsys_runtime_resume(struct device *dev) { return 0; }
 #endif
 
-#ifdef CONFIG_ACPI_SLEEP
+#if defined(CONFIG_ACPI) && defined(CONFIG_PM_SLEEP)
 int acpi_dev_suspend_late(struct device *dev);
 int acpi_dev_resume_early(struct device *dev);
 int acpi_subsys_prepare(struct device *dev);

include/linux/sysfs.h

@@ -181,6 +181,10 @@ int sysfs_merge_group(struct kobject *kobj,
 		       const struct attribute_group *grp);
 void sysfs_unmerge_group(struct kobject *kobj,
 		       const struct attribute_group *grp);
+int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name,
+			    struct kobject *target, const char *link_name);
+void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
+				  const char *link_name);
 
 void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr);
 void sysfs_notify_dirent(struct sysfs_dirent *sd);
@@ -326,6 +330,18 @@ static inline void sysfs_unmerge_group(struct kobject *kobj,
 {
 }
 
+static inline int sysfs_add_link_to_group(struct kobject *kobj,
+		const char *group_name, struct kobject *target,
+		const char *link_name)
+{
+	return 0;
+}
+
+static inline void sysfs_remove_link_from_group(struct kobject *kobj,
+		const char *group_name, const char *link_name)
+{
+}
+
 static inline void sysfs_notify(struct kobject *kobj, const char *dir,
 				const char *attr)
 {