1 files changed, 413 insertions, 314 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index b643aed8b74..4be408756ad 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -29,29 +29,10 @@ extern struct acpi_device *acpi_root;
 
 static const char *dummy_hid = "device";
 
-/*
- * The following ACPI IDs are known to be suitable for representing as
- * platform devices.
- */
-static const struct acpi_device_id acpi_platform_device_ids[] = {
-
-	{ "PNP0D40" },
-
-	/* Haswell LPSS devices */
-	{ "INT33C0", 0 },
-	{ "INT33C1", 0 },
-	{ "INT33C2", 0 },
-	{ "INT33C3", 0 },
-	{ "INT33C4", 0 },
-	{ "INT33C5", 0 },
-	{ "INT33C6", 0 },
-	{ "INT33C7", 0 },
-
-	{ }
-};
-
 static LIST_HEAD(acpi_device_list);
 static LIST_HEAD(acpi_bus_id_list);
+static DEFINE_MUTEX(acpi_scan_lock);
+static LIST_HEAD(acpi_scan_handlers_list);
 DEFINE_MUTEX(acpi_device_lock);
 LIST_HEAD(acpi_wakeup_device_list);
 
@@ -61,6 +42,27 @@ struct acpi_device_bus_id{
 	struct list_head node;
 };
 
+void acpi_scan_lock_acquire(void)
+{
+	mutex_lock(&acpi_scan_lock);
+}
+EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
+
+void acpi_scan_lock_release(void)
+{
+	mutex_unlock(&acpi_scan_lock);
+}
+EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
+
+int acpi_scan_add_handler(struct acpi_scan_handler *handler)
+{
+	if (!handler || !handler->attach)
+		return -EINVAL;
+
+	list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
+	return 0;
+}
+
 /*
  * Creates hid/cid(s) string needed for modalias and uevent
  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
@@ -115,7 +117,7 @@ static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  */
 void acpi_bus_hot_remove_device(void *context)
 {
-	struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
+	struct acpi_eject_event *ej_event = context;
 	struct acpi_device *device = ej_event->device;
 	acpi_handle handle = device->handle;
 	acpi_handle temp;
@@ -124,23 +126,22 @@ void acpi_bus_hot_remove_device(void *context)
 	acpi_status status = AE_OK;
 	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 
-	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-		"Hot-removing device %s...\n", dev_name(&device->dev)));
+	mutex_lock(&acpi_scan_lock);
 
-	if (acpi_bus_trim(device)) {
-		printk(KERN_ERR PREFIX
-				"Removing device failed\n");
-		goto err_out;
+	/* If there is no handle, the device node has been unregistered. */
+	if (!device->handle) {
+		dev_dbg(&device->dev, "ACPI handle missing\n");
+		put_device(&device->dev);
+		goto out;
 	}
 
-	/* device has been freed */
-	device = NULL;
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+		"Hot-removing device %s...\n", dev_name(&device->dev)));
 
-	/* power off device */
-	status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
-	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
-		printk(KERN_WARNING PREFIX
-				"Power-off device failed\n");
+	acpi_bus_trim(device);
+	/* Device node has been unregistered. */
+	put_device(&device->dev);
+	device = NULL;
 
 	if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
 		arg_list.count = 1;
@@ -161,23 +162,46 @@ void acpi_bus_hot_remove_device(void *context)
 	status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 	if (ACPI_FAILURE(status)) {
 		if (status != AE_NOT_FOUND)
-			printk(KERN_WARNING PREFIX
-					"Eject device failed\n");
-		goto err_out;
-	}
+			acpi_handle_warn(handle, "Eject failed\n");
 
-	kfree(context);
-	return;
+		/* Tell the firmware the hot-remove operation has failed. */
+		acpi_evaluate_hotplug_ost(handle, ej_event->event,
+					  ost_code, NULL);
+	}
 
-err_out:
-	/* Inform firmware the hot-remove operation has completed w/ error */
-	(void) acpi_evaluate_hotplug_ost(handle,
-				ej_event->event, ost_code, NULL);
+ out:
+	mutex_unlock(&acpi_scan_lock);
 	kfree(context);
 	return;
 }
 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 
+static ssize_t real_power_state_show(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct acpi_device *adev = to_acpi_device(dev);
+	int state;
+	int ret;
+
+	ret = acpi_device_get_power(adev, &state);
+	if (ret)
+		return ret;
+
+	return sprintf(buf, "%s\n", acpi_power_state_string(state));
+}
+
+static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
+
+static ssize_t power_state_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct acpi_device *adev = to_acpi_device(dev);
+
+	return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
+}
+
+static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
+
 static ssize_t
 acpi_eject_store(struct device *d, struct device_attribute *attr,
 		const char *buf, size_t count)
@@ -191,12 +215,10 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
 	if ((!count) || (buf[0] != '1')) {
 		return -EINVAL;
 	}
-#ifndef FORCE_EJECT
-	if (acpi_device->driver == NULL) {
+	if (!acpi_device->driver && !acpi_device->handler) {
 		ret = -ENODEV;
 		goto err;
 	}
-#endif
 	status = acpi_get_type(acpi_device->handle, &type);
 	if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 		ret = -ENODEV;
@@ -209,6 +231,7 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
 		goto err;
 	}
 
+	get_device(&acpi_device->dev);
 	ej_event->device = acpi_device;
 	if (acpi_device->flags.eject_pending) {
 		/* event originated from ACPI eject notification */
@@ -221,7 +244,11 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
 			ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 	}
 
-	acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
+	status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
+	if (ACPI_FAILURE(status)) {
+		put_device(&acpi_device->dev);
+		kfree(ej_event);
+	}
 err:
 	return ret;
 }
@@ -369,8 +396,22 @@ static int acpi_device_setup_files(struct acpi_device *dev)
          * hot-removal function from userland.
          */
 	status = acpi_get_handle(dev->handle, "_EJ0", &temp);
-	if (ACPI_SUCCESS(status))
+	if (ACPI_SUCCESS(status)) {
 		result = device_create_file(&dev->dev, &dev_attr_eject);
+		if (result)
+			return result;
+	}
+
+	if (dev->flags.power_manageable) {
+		result = device_create_file(&dev->dev, &dev_attr_power_state);
+		if (result)
+			return result;
+
+		if (dev->power.flags.power_resources)
+			result = device_create_file(&dev->dev,
+						    &dev_attr_real_power_state);
+	}
+
 end:
 	return result;
 }
@@ -380,6 +421,13 @@ static void acpi_device_remove_files(struct acpi_device *dev)
 	acpi_status status;
 	acpi_handle temp;
 
+	if (dev->flags.power_manageable) {
+		device_remove_file(&dev->dev, &dev_attr_power_state);
+		if (dev->power.flags.power_resources)
+			device_remove_file(&dev->dev,
+					   &dev_attr_real_power_state);
+	}
+
 	/*
 	 * If device has _STR, remove 'description' file
 	 */
@@ -448,9 +496,9 @@ const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 					       const struct device *dev)
 {
 	struct acpi_device *adev;
+	acpi_handle handle = ACPI_HANDLE(dev);
 
-	if (!ids || !ACPI_HANDLE(dev)
-	    || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
+	if (!ids || !handle || acpi_bus_get_device(handle, &adev))
 		return NULL;
 
 	return __acpi_match_device(adev, ids);
@@ -464,7 +512,7 @@ int acpi_match_device_ids(struct acpi_device *device,
 }
 EXPORT_SYMBOL(acpi_match_device_ids);
 
-static void acpi_free_ids(struct acpi_device *device)
+void acpi_free_ids(struct acpi_device *device)
 {
 	struct acpi_hardware_id *id, *tmp;
 
@@ -472,6 +520,23 @@ static void acpi_free_ids(struct acpi_device *device)
 		kfree(id->id);
 		kfree(id);
 	}
+	kfree(device->pnp.unique_id);
+}
+
+static void acpi_free_power_resources_lists(struct acpi_device *device)
+{
+	int i;
+
+	if (device->wakeup.flags.valid)
+		acpi_power_resources_list_free(&device->wakeup.resources);
+
+	if (!device->flags.power_manageable)
+		return;
+
+	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
+		struct acpi_device_power_state *ps = &device->power.states[i];
+		acpi_power_resources_list_free(&ps->resources);
+	}
 }
 
 static void acpi_device_release(struct device *dev)
@@ -479,7 +544,7 @@ static void acpi_device_release(struct device *dev)
 	struct acpi_device *acpi_dev = to_acpi_device(dev);
 
 	acpi_free_ids(acpi_dev);
-	kfree(acpi_dev->pnp.unique_id);
+	acpi_free_power_resources_lists(acpi_dev);
 	kfree(acpi_dev);
 }
 
@@ -577,8 +642,9 @@ static int acpi_device_probe(struct device * dev)
 			ret = acpi_device_install_notify_handler(acpi_dev);
 			if (ret) {
 				if (acpi_drv->ops.remove)
-					acpi_drv->ops.remove(acpi_dev,
-						     acpi_dev->removal_type);
+					acpi_drv->ops.remove(acpi_dev);
+				acpi_dev->driver = NULL;
+				acpi_dev->driver_data = NULL;
 				return ret;
 			}
 		}
@@ -600,7 +666,7 @@ static int acpi_device_remove(struct device * dev)
 		if (acpi_drv->ops.notify)
 			acpi_device_remove_notify_handler(acpi_dev);
 		if (acpi_drv->ops.remove)
-			acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
+			acpi_drv->ops.remove(acpi_dev);
 	}
 	acpi_dev->driver = NULL;
 	acpi_dev->driver_data = NULL;
@@ -617,12 +683,25 @@ struct bus_type acpi_bus_type = {
 	.uevent		= acpi_device_uevent,
 };
 
-static int acpi_device_register(struct acpi_device *device)
+int acpi_device_add(struct acpi_device *device,
+		    void (*release)(struct device *))
 {
 	int result;
 	struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 	int found = 0;
 
+	if (device->handle) {
+		acpi_status status;
+
+		status = acpi_attach_data(device->handle, acpi_bus_data_handler,
+					  device);
+		if (ACPI_FAILURE(status)) {
+			acpi_handle_err(device->handle,
+					"Unable to attach device data\n");
+			return -ENODEV;
+		}
+	}
+
 	/*
 	 * Linkage
 	 * -------
@@ -633,11 +712,13 @@ static int acpi_device_register(struct acpi_device *device)
 	INIT_LIST_HEAD(&device->wakeup_list);
 	INIT_LIST_HEAD(&device->physical_node_list);
 	mutex_init(&device->physical_node_lock);
+	INIT_LIST_HEAD(&device->power_dependent);
 
 	new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 	if (!new_bus_id) {
-		printk(KERN_ERR PREFIX "Memory allocation error\n");
-		return -ENOMEM;
+		pr_err(PREFIX "Memory allocation error\n");
+		result = -ENOMEM;
+		goto err_detach;
 	}
 
 	mutex_lock(&acpi_device_lock);
@@ -672,11 +753,11 @@ static int acpi_device_register(struct acpi_device *device)
 	if (device->parent)
 		device->dev.parent = &device->parent->dev;
 	device->dev.bus = &acpi_bus_type;
-	device->dev.release = &acpi_device_release;
-	result = device_register(&device->dev);
+	device->dev.release = release;
+	result = device_add(&device->dev);
 	if (result) {
 		dev_err(&device->dev, "Error registering device\n");
-		goto end;
+		goto err;
 	}
 
 	result = acpi_device_setup_files(device);
@@ -686,12 +767,16 @@ static int acpi_device_register(struct acpi_device *device)
 
 	device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 	return 0;
-end:
+
+ err:
 	mutex_lock(&acpi_device_lock);
 	if (device->parent)
 		list_del(&device->node);
 	list_del(&device->wakeup_list);
 	mutex_unlock(&acpi_device_lock);
+
+ err_detach:
+	acpi_detach_data(device->handle, acpi_bus_data_handler);
 	return result;
 }
 
@@ -706,8 +791,20 @@ static void acpi_device_unregister(struct acpi_device *device)
 
 	acpi_detach_data(device->handle, acpi_bus_data_handler);
 
+	acpi_power_add_remove_device(device, false);
 	acpi_device_remove_files(device);
-	device_unregister(&device->dev);
+	if (device->remove)
+		device->remove(device);
+
+	device_del(&device->dev);
+	/*
+	 * Transition the device to D3cold to drop the reference counts of all
+	 * power resources the device depends on and turn off the ones that have
+	 * no more references.
+	 */
+	acpi_device_set_power(device, ACPI_STATE_D3_COLD);
+	device->handle = NULL;
+	put_device(&device->dev);
 }
 
 /* --------------------------------------------------------------------------
@@ -794,29 +891,23 @@ EXPORT_SYMBOL(acpi_bus_unregister_driver);
    -------------------------------------------------------------------------- */
 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 {
+	struct acpi_device *device = NULL;
 	acpi_status status;
-	int ret;
-	struct acpi_device *device;
 
 	/*
 	 * Fixed hardware devices do not appear in the namespace and do not
 	 * have handles, but we fabricate acpi_devices for them, so we have
 	 * to deal with them specially.
 	 */
-	if (handle == NULL)
+	if (!handle)
 		return acpi_root;
 
 	do {
 		status = acpi_get_parent(handle, &handle);
-		if (status == AE_NULL_ENTRY)
-			return NULL;
 		if (ACPI_FAILURE(status))
-			return acpi_root;
-
-		ret = acpi_bus_get_device(handle, &device);
-		if (ret == 0)
-			return device;
-	} while (1);
+			return status == AE_NULL_ENTRY ? NULL : acpi_root;
+	} while (acpi_bus_get_device(handle, &device));
+	return device;
 }
 
 acpi_status
@@ -850,52 +941,43 @@ void acpi_bus_data_handler(acpi_handle handle, void *context)
 	return;
 }
 
-static int acpi_bus_get_perf_flags(struct acpi_device *device)
-{
-	device->performance.state = ACPI_STATE_UNKNOWN;
-	return 0;
-}
-
-static acpi_status
-acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
-					     struct acpi_device_wakeup *wakeup)
+static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
+					struct acpi_device_wakeup *wakeup)
 {
 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 	union acpi_object *package = NULL;
 	union acpi_object *element = NULL;
 	acpi_status status;
-	int i = 0;
+	int err = -ENODATA;
 
 	if (!wakeup)
-		return AE_BAD_PARAMETER;
+		return -EINVAL;
+
+	INIT_LIST_HEAD(&wakeup->resources);
 
 	/* _PRW */
 	status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 	if (ACPI_FAILURE(status)) {
 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
-		return status;
+		return err;
 	}
 
 	package = (union acpi_object *)buffer.pointer;
 
-	if (!package || (package->package.count < 2)) {
-		status = AE_BAD_DATA;
+	if (!package || package->package.count < 2)
 		goto out;
-	}
 
 	element = &(package->package.elements[0]);
-	if (!element) {
-		status = AE_BAD_DATA;
+	if (!element)
 		goto out;
-	}
+
 	if (element->type == ACPI_TYPE_PACKAGE) {
 		if ((element->package.count < 2) ||
 		    (element->package.elements[0].type !=
 		     ACPI_TYPE_LOCAL_REFERENCE)
-		    || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
-			status = AE_BAD_DATA;
+		    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 			goto out;
-		}
+
 		wakeup->gpe_device =
 		    element->package.elements[0].reference.handle;
 		wakeup->gpe_number =
@@ -904,38 +986,35 @@ acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 		wakeup->gpe_device = NULL;
 		wakeup->gpe_number = element->integer.value;
 	} else {
-		status = AE_BAD_DATA;
 		goto out;
 	}
 
 	element = &(package->package.elements[1]);
-	if (element->type != ACPI_TYPE_INTEGER) {
-		status = AE_BAD_DATA;
+	if (element->type != ACPI_TYPE_INTEGER)
 		goto out;
-	}
+
 	wakeup->sleep_state = element->integer.value;
 
-	if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
-		status = AE_NO_MEMORY;
+	err = acpi_extract_power_resources(package, 2, &wakeup->resources);
+	if (err)
 		goto out;
-	}
-	wakeup->resources.count = package->package.count - 2;
-	for (i = 0; i < wakeup->resources.count; i++) {
-		element = &(package->package.elements[i + 2]);
-		if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
-			status = AE_BAD_DATA;
-			goto out;
-		}
 
-		wakeup->resources.handles[i] = element->reference.handle;
-	}
+	if (!list_empty(&wakeup->resources)) {
+		int sleep_state;
 
+		sleep_state = acpi_power_min_system_level(&wakeup->resources);
+		if (sleep_state < wakeup->sleep_state) {
+			acpi_handle_warn(handle, "Overriding _PRW sleep state "
+					 "(S%d) by S%d from power resources\n",
+					 (int)wakeup->sleep_state, sleep_state);
+			wakeup->sleep_state = sleep_state;
+		}
+	}
 	acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
 
  out:
 	kfree(buffer.pointer);
-
-	return status;
+	return err;
 }
 
 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
@@ -975,17 +1054,17 @@ static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 {
 	acpi_handle temp;
 	acpi_status status = 0;
-	int psw_error;
+	int err;
 
 	/* Presence of _PRW indicates wake capable */
 	status = acpi_get_handle(device->handle, "_PRW", &temp);
 	if (ACPI_FAILURE(status))
 		return;
 
-	status = acpi_bus_extract_wakeup_device_power_package(device->handle,
-							      &device->wakeup);
-	if (ACPI_FAILURE(status)) {
-		ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
+	err = acpi_bus_extract_wakeup_device_power_package(device->handle,
+							   &device->wakeup);
+	if (err) {
+		dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
 		return;
 	}
 
@@ -998,20 +1077,73 @@ static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 	 * So it is necessary to call _DSW object first. Only when it is not
 	 * present will the _PSW object used.
 	 */
-	psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
-	if (psw_error)
+	err = acpi_device_sleep_wake(device, 0, 0, 0);
+	if (err)
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 				"error in _DSW or _PSW evaluation\n"));
 }
 
-static void acpi_bus_add_power_resource(acpi_handle handle);
+static void acpi_bus_init_power_state(struct acpi_device *device, int state)
+{
+	struct acpi_device_power_state *ps = &device->power.states[state];
+	char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	acpi_handle handle;
+	acpi_status status;
+
+	INIT_LIST_HEAD(&ps->resources);
+
+	/* Evaluate "_PRx" to get referenced power resources */
+	status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
+	if (ACPI_SUCCESS(status)) {
+		union acpi_object *package = buffer.pointer;
+
+		if (buffer.length && package
+		    && package->type == ACPI_TYPE_PACKAGE
+		    && package->package.count) {
+			int err = acpi_extract_power_resources(package, 0,
+							       &ps->resources);
+			if (!err)
+				device->power.flags.power_resources = 1;
+		}
+		ACPI_FREE(buffer.pointer);
+	}
 
-static int acpi_bus_get_power_flags(struct acpi_device *device)
+	/* Evaluate "_PSx" to see if we can do explicit sets */
+	pathname[2] = 'S';
+	status = acpi_get_handle(device->handle, pathname, &handle);
+	if (ACPI_SUCCESS(status))
+		ps->flags.explicit_set = 1;
+
+	/*
+	 * State is valid if there are means to put the device into it.
+	 * D3hot is only valid if _PR3 present.
+	 */
+	if (!list_empty(&ps->resources)
+	    || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
+		ps->flags.valid = 1;
+		ps->flags.os_accessible = 1;
+	}
+
+	ps->power = -1;		/* Unknown - driver assigned */
+	ps->latency = -1;	/* Unknown - driver assigned */
+}
+
+static void acpi_bus_get_power_flags(struct acpi_device *device)
 {
-	acpi_status status = 0;
-	acpi_handle handle = NULL;
-	u32 i = 0;
+	acpi_status status;
+	acpi_handle handle;
+	u32 i;
 
+	/* Presence of _PS0|_PR0 indicates 'power manageable' */
+	status = acpi_get_handle(device->handle, "_PS0", &handle);
+	if (ACPI_FAILURE(status)) {
+		status = acpi_get_handle(device->handle, "_PR0", &handle);
+		if (ACPI_FAILURE(status))
+			return;
+	}
+
+	device->flags.power_manageable = 1;
 
 	/*
 	 * Power Management Flags
@@ -1026,40 +1158,10 @@ static int acpi_bus_get_power_flags(struct acpi_device *device)
 	/*
 	 * Enumerate supported power management states
 	 */
-	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
-		struct acpi_device_power_state *ps = &device->power.states[i];
-		char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
-
-		/* Evaluate "_PRx" to se if power resources are referenced */
-		acpi_evaluate_reference(device->handle, object_name, NULL,
-					&ps->resources);
-		if (ps->resources.count) {
-			int j;
-
-			device->power.flags.power_resources = 1;
-			for (j = 0; j < ps->resources.count; j++)
-				acpi_bus_add_power_resource(ps->resources.handles[j]);
-		}
-
-		/* Evaluate "_PSx" to see if we can do explicit sets */
-		object_name[2] = 'S';
-		status = acpi_get_handle(device->handle, object_name, &handle);
-		if (ACPI_SUCCESS(status))
-			ps->flags.explicit_set = 1;
-
-		/*
-		 * State is valid if there are means to put the device into it.
-		 * D3hot is only valid if _PR3 present.
-		 */
-		if (ps->resources.count ||
-		    (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
-			ps->flags.valid = 1;
-			ps->flags.os_accessible = 1;
-		}
+	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
+		acpi_bus_init_power_state(device, i);
 
-		ps->power = -1;	/* Unknown - driver assigned */
-		ps->latency = -1;	/* Unknown - driver assigned */
-	}
+	INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
 
 	/* Set defaults for D0 and D3 states (always valid) */
 	device->power.states[ACPI_STATE_D0].flags.valid = 1;
@@ -1076,17 +1178,17 @@ static int acpi_bus_get_power_flags(struct acpi_device *device)
 			device->power.flags.power_resources)
 		device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
 
-	acpi_bus_init_power(device);
-
-	return 0;
+	if (acpi_bus_init_power(device)) {
+		acpi_free_power_resources_lists(device);
+		device->flags.power_manageable = 0;
+	}
 }
 
-static int acpi_bus_get_flags(struct acpi_device *device)
+static void acpi_bus_get_flags(struct acpi_device *device)
 {
 	acpi_status status = AE_OK;
 	acpi_handle temp = NULL;
 
-
 	/* Presence of _STA indicates 'dynamic_status' */
 	status = acpi_get_handle(device->handle, "_STA", &temp);
 	if (ACPI_SUCCESS(status))
@@ -1106,21 +1208,6 @@ static int acpi_bus_get_flags(struct acpi_device *device)
 		if (ACPI_SUCCESS(status))
 			device->flags.ejectable = 1;
 	}
-
-	/* Power resources cannot be power manageable. */
-	if (device->device_type == ACPI_BUS_TYPE_POWER)
-		return 0;
-
-	/* Presence of _PS0|_PR0 indicates 'power manageable' */
-	status = acpi_get_handle(device->handle, "_PS0", &temp);
-	if (ACPI_FAILURE(status))
-		status = acpi_get_handle(device->handle, "_PR0", &temp);
-	if (ACPI_SUCCESS(status))
-		device->flags.power_manageable = 1;
-
-	/* TBD: Performance management */
-
-	return 0;
 }
 
 static void acpi_device_get_busid(struct acpi_device *device)
@@ -1319,7 +1406,7 @@ static void acpi_device_set_id(struct acpi_device *device)
 			acpi_add_id(device, ACPI_DOCK_HID);
 		else if (!acpi_ibm_smbus_match(device))
 			acpi_add_id(device, ACPI_SMBUS_IBM_HID);
-		else if (!acpi_device_hid(device) &&
+		else if (list_empty(&device->pnp.ids) &&
 			 ACPI_IS_ROOT_DEVICE(device->parent)) {
 			acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
 			strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
@@ -1345,32 +1432,32 @@ static void acpi_device_set_id(struct acpi_device *device)
 	}
 }
 
-static int acpi_device_set_context(struct acpi_device *device)
+void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
+			     int type, unsigned long long sta)
 {
-	acpi_status status;
-
-	/*
-	 * Context
-	 * -------
-	 * Attach this 'struct acpi_device' to the ACPI object.  This makes
-	 * resolutions from handle->device very efficient.  Fixed hardware
-	 * devices have no handles, so we skip them.
-	 */
-	if (!device->handle)
-		return 0;
-
-	status = acpi_attach_data(device->handle,
-				  acpi_bus_data_handler, device);
-	if (ACPI_SUCCESS(status))
-		return 0;
+	INIT_LIST_HEAD(&device->pnp.ids);
+	device->device_type = type;
+	device->handle = handle;
+	device->parent = acpi_bus_get_parent(handle);
+	STRUCT_TO_INT(device->status) = sta;
+	acpi_device_get_busid(device);
+	acpi_device_set_id(device);
+	acpi_bus_get_flags(device);
+	device->flags.match_driver = false;
+	device_initialize(&device->dev);
+	dev_set_uevent_suppress(&device->dev, true);
+}
 
-	printk(KERN_ERR PREFIX "Error attaching device data\n");
-	return -ENODEV;
+void acpi_device_add_finalize(struct acpi_device *device)
+{
+	device->flags.match_driver = true;
+	dev_set_uevent_suppress(&device->dev, false);
+	kobject_uevent(&device->dev.kobj, KOBJ_ADD);
 }
 
 static int acpi_add_single_object(struct acpi_device **child,
 				  acpi_handle handle, int type,
-				  unsigned long long sta, bool match_driver)
+				  unsigned long long sta)
 {
 	int result;
 	struct acpi_device *device;
@@ -1382,90 +1469,25 @@ static int acpi_add_single_object(struct acpi_device **child,
 		return -ENOMEM;
 	}
 
-	INIT_LIST_HEAD(&device->pnp.ids);
-	device->device_type = type;
-	device->handle = handle;
-	device->parent = acpi_bus_get_parent(handle);
-	STRUCT_TO_INT(device->status) = sta;
-
-	acpi_device_get_busid(device);
-
-	/*
-	 * Flags
-	 * -----
-	 * Note that we only look for object handles -- cannot evaluate objects
-	 * until we know the device is present and properly initialized.
-	 */
-	result = acpi_bus_get_flags(device);
-	if (result)
-		goto end;
-
-	/*
-	 * Initialize Device
-	 * -----------------
-	 * TBD: Synch with Core's enumeration/initialization process.
-	 */
-	acpi_device_set_id(device);
-
-	/*
-	 * Power Management
-	 * ----------------
-	 */
-	if (device->flags.power_manageable) {
-		result = acpi_bus_get_power_flags(device);
-		if (result)
-			goto end;
-	}
-
-	/*
-	 * Wakeup device management
-	 *-----------------------
-	 */
+	acpi_init_device_object(device, handle, type, sta);
+	acpi_bus_get_power_flags(device);
 	acpi_bus_get_wakeup_device_flags(device);
 
-	/*
-	 * Performance Management
-	 * ----------------------
-	 */
-	if (device->flags.performance_manageable) {
-		result = acpi_bus_get_perf_flags(device);
-		if (result)
-			goto end;
-	}
-
-	if ((result = acpi_device_set_context(device)))
-		goto end;
-
-	device->flags.match_driver = match_driver;
-	result = acpi_device_register(device);
-
-end:
-	if (!result) {
-		acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-			"Adding %s [%s] parent %s\n", dev_name(&device->dev),
-			 (char *) buffer.pointer,
-			 device->parent ? dev_name(&device->parent->dev) :
-					  "(null)"));
-		kfree(buffer.pointer);
-		*child = device;
-	} else
+	result = acpi_device_add(device, acpi_device_release);
+	if (result) {
 		acpi_device_release(&device->dev);
+		return result;
+	}
 
-	return result;
-}
-
-#define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
-			  ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
-
-static void acpi_bus_add_power_resource(acpi_handle handle)
-{
-	struct acpi_device *device = NULL;
-
-	acpi_bus_get_device(handle, &device);
-	if (!device)
-		acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
-					ACPI_STA_DEFAULT, true);
+	acpi_power_add_remove_device(device, true);
+	acpi_device_add_finalize(device);
+	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
+		dev_name(&device->dev), (char *) buffer.pointer,
+		device->parent ? dev_name(&device->parent->dev) : "(null)"));
+	kfree(buffer.pointer);
+	*child = device;
+	return 0;
 }
 
 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
@@ -1524,25 +1546,29 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
 	if (result)
 		return AE_OK;
 
+	if (type == ACPI_BUS_TYPE_POWER) {
+		acpi_add_power_resource(handle);
+		return AE_OK;
+	}
+
 	if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
 	    !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
 		struct acpi_device_wakeup wakeup;
 		acpi_handle temp;
 
 		status = acpi_get_handle(handle, "_PRW", &temp);
-		if (ACPI_SUCCESS(status))
+		if (ACPI_SUCCESS(status)) {
 			acpi_bus_extract_wakeup_device_power_package(handle,
 								     &wakeup);
+			acpi_power_resources_list_free(&wakeup.resources);
+		}
 		return AE_CTRL_DEPTH;
 	}
 
-	acpi_add_single_object(&device, handle, type, sta,
-			       type == ACPI_BUS_TYPE_POWER);
+	acpi_add_single_object(&device, handle, type, sta);
 	if (!device)
 		return AE_CTRL_DEPTH;
 
-	device->flags.match_driver = true;
-
  out:
 	if (!*return_value)
 		*return_value = device;
@@ -1550,31 +1576,68 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
 	return AE_OK;
 }
 
+static int acpi_scan_do_attach_handler(struct acpi_device *device, char *id)
+{
+	struct acpi_scan_handler *handler;
+
+	list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) {
+		const struct acpi_device_id *devid;
+
+		for (devid = handler->ids; devid->id[0]; devid++) {
+			int ret;
+
+			if (strcmp((char *)devid->id, id))
+				continue;
+
+			ret = handler->attach(device, devid);
+			if (ret > 0) {
+				device->handler = handler;
+				return ret;
+			} else if (ret < 0) {
+				return ret;
+			}
+		}
+	}
+	return 0;
+}
+
+static int acpi_scan_attach_handler(struct acpi_device *device)
+{
+	struct acpi_hardware_id *hwid;
+	int ret = 0;
+
+	list_for_each_entry(hwid, &device->pnp.ids, list) {
+		ret = acpi_scan_do_attach_handler(device, hwid->id);
+		if (ret)
+			break;
+
+	}
+	return ret;
+}
+
 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
 					  void *not_used, void **ret_not_used)
 {
-	acpi_status status = AE_OK;
 	struct acpi_device *device;
 	unsigned long long sta_not_used;
-	int type_not_used;
+	int ret;
 
 	/*
 	 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
 	 * namespace walks prematurely.
 	 */
-	if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
+	if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
 		return AE_OK;
 
 	if (acpi_bus_get_device(handle, &device))
 		return AE_CTRL_DEPTH;
 
-	if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
-		/* This is a known good platform device. */
-		acpi_create_platform_device(device);
-	} else if (device_attach(&device->dev) < 0) {
-		status = AE_CTRL_DEPTH;
-	}
-	return status;
+	ret = acpi_scan_attach_handler(device);
+	if (ret)
+		return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
+
+	ret = device_attach(&device->dev);
+	return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
 }
 
 /**
@@ -1588,23 +1651,25 @@ static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
  * there has been a real error.  There just have been no suitable ACPI objects
  * in the table trunk from which the kernel could create a device and add an
  * appropriate driver.
+ *
+ * Must be called under acpi_scan_lock.
  */
 int acpi_bus_scan(acpi_handle handle)
 {
 	void *device = NULL;
+	int error = 0;
 
 	if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
 		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 				    acpi_bus_check_add, NULL, NULL, &device);
 
 	if (!device)
-		return -ENODEV;
-
-	if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
+		error = -ENODEV;
+	else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
 		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 				    acpi_bus_device_attach, NULL, NULL, NULL);
 
-	return 0;
+	return error;
 }
 EXPORT_SYMBOL(acpi_bus_scan);
 
@@ -1614,8 +1679,17 @@ static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
 	struct acpi_device *device = NULL;
 
 	if (!acpi_bus_get_device(handle, &device)) {
+		struct acpi_scan_handler *dev_handler = device->handler;
+
 		device->removal_type = ACPI_BUS_REMOVAL_EJECT;
-		device_release_driver(&device->dev);
+		if (dev_handler) {
+			if (dev_handler->detach)
+				dev_handler->detach(device);
+
+			device->handler = NULL;
+		} else {
+			device_release_driver(&device->dev);
+		}
 	}
 	return AE_OK;
 }
@@ -1631,7 +1705,13 @@ static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
 	return AE_OK;
 }
 
-int acpi_bus_trim(struct acpi_device *start)
+/**
+ * acpi_bus_trim - Remove ACPI device node and all of its descendants
+ * @start: Root of the ACPI device nodes subtree to remove.
+ *
+ * Must be called under acpi_scan_lock.
+ */
+void acpi_bus_trim(struct acpi_device *start)
 {
 	/*
 	 * Execute acpi_bus_device_detach() as a post-order callback to detach
@@ -1647,32 +1727,45 @@ int acpi_bus_trim(struct acpi_device *start)
 	acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
 			    acpi_bus_remove, NULL, NULL);
 	acpi_bus_remove(start->handle, 0, NULL, NULL);
-	return 0;
 }
 EXPORT_SYMBOL_GPL(acpi_bus_trim);
 
 static int acpi_bus_scan_fixed(void)
 {
 	int result = 0;
-	struct acpi_device *device = NULL;
 
 	/*
 	 * Enumerate all fixed-feature devices.
 	 */
-	if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
+	if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
+		struct acpi_device *device = NULL;
+
 		result = acpi_add_single_object(&device, NULL,
 						ACPI_BUS_TYPE_POWER_BUTTON,
-						ACPI_STA_DEFAULT, true);
+						ACPI_STA_DEFAULT);
+		if (result)
+			return result;
+
+		result = device_attach(&device->dev);
+		if (result < 0)
+			return result;
+
 		device_init_wakeup(&device->dev, true);
 	}
 
-	if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
+	if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
+		struct acpi_device *device = NULL;
+
 		result = acpi_add_single_object(&device, NULL,
 						ACPI_BUS_TYPE_SLEEP_BUTTON,
-						ACPI_STA_DEFAULT, true);
+						ACPI_STA_DEFAULT);
+		if (result)
+			return result;
+
+		result = device_attach(&device->dev);
 	}
 
-	return result;
+	return result < 0 ? result : 0;
 }
 
 int __init acpi_scan_init(void)
@@ -1685,30 +1778,36 @@ int __init acpi_scan_init(void)
 		printk(KERN_ERR PREFIX "Could not register bus type\n");
 	}
 
-	acpi_power_init();
 	acpi_pci_root_init();
+	acpi_pci_link_init();
+	acpi_platform_init();
+	acpi_csrt_init();
+	acpi_container_init();
 	acpi_pci_slot_init();
 
+	mutex_lock(&acpi_scan_lock);
 	/*
 	 * Enumerate devices in the ACPI namespace.
 	 */
 	result = acpi_bus_scan(ACPI_ROOT_OBJECT);
 	if (result)
-		return result;
+		goto out;
 
 	result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
 	if (result)
-		return result;
+		goto out;
 
 	result = acpi_bus_scan_fixed();
 	if (result) {
 		acpi_device_unregister(acpi_root);
-		return result;
+		goto out;
 	}
 
 	acpi_update_all_gpes();
 
 	acpi_pci_root_hp_init();
 
-	return 0;
+ out:
+	mutex_unlock(&acpi_scan_lock);
+	return result;
 }