Merge branch 'acpi-enumeration'

* acpi-enumeration:
  ACPI: remove unnecessary INIT_LIST_HEAD
  ACPI / platform: include missed header into acpi_platform.c
  platform / ACPI: Attach/detach ACPI PM during probe/remove/shutdown
  mmc: sdhci-acpi: add SDHCI ACPI driver
  ACPI: add SDHCI to ACPI platform devices
  ACPI / PNP: skip ACPI device nodes associated with physical nodes already
  i2c / ACPI: add ACPI enumeration support
  ACPI / platform: Initialize ACPI handles of platform devices in advance
  ACPI / driver core: Introduce struct acpi_dev_node and related macros
  ACPI: Allow ACPI handles of devices to be initialized in advance
  ACPI / resources: Use AE_CTRL_TERMINATE to terminate resources walks
  ACPI: Centralized processing of ACPI device resources
  ACPI / platform: Use common ACPI device resource parsing routines
  ACPI: Move device resources interpretation code from PNP to ACPI core
  ACPI / platform: use ACPI device name instead of _HID._UID
  ACPI: Add support for platform bus type
  ACPI / ia64: Export acpi_[un]register_gsi()
  ACPI / x86: Export acpi_[un]register_gsi()
  ACPI: Provide generic functions for matching ACPI device nodes
  driver core / ACPI: Move ACPI support to core device and driver types

9 files changed, 840 insertions, 28 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 119d58db8342..0300bf612946 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -181,6 +181,12 @@ config ACPI_DOCK
 	  This driver supports ACPI-controlled docking stations and removable
 	  drive bays such as the IBM Ultrabay and the Dell Module Bay.
 
+config ACPI_I2C
+	def_tristate I2C
+	depends on I2C
+	help
+	  ACPI I2C enumeration support.
+
 config ACPI_PROCESSOR
 	tristate "Processor"
 	select THERMAL
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index a2711fae62d8..2a4502becd13 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -33,10 +33,12 @@ acpi-$(CONFIG_ACPI_SLEEP)	+= proc.o
 #
 acpi-y				+= bus.o glue.o
 acpi-y				+= scan.o
+acpi-y				+= resource.o
 acpi-y				+= processor_core.o
 acpi-y				+= ec.o
 acpi-$(CONFIG_ACPI_DOCK)	+= dock.o
 acpi-y				+= pci_root.o pci_link.o pci_irq.o pci_bind.o
+acpi-y				+= acpi_platform.o
 acpi-y				+= power.o
 acpi-y				+= event.o
 acpi-y				+= sysfs.o
@@ -68,6 +70,7 @@ obj-$(CONFIG_ACPI_HED)		+= hed.o
 obj-$(CONFIG_ACPI_EC_DEBUGFS)	+= ec_sys.o
 obj-$(CONFIG_ACPI_CUSTOM_METHOD)+= custom_method.o
 obj-$(CONFIG_ACPI_BGRT)		+= bgrt.o
+obj-$(CONFIG_ACPI_I2C)		+= acpi_i2c.o
 
 # processor has its own "processor." module_param namespace
 processor-y			:= processor_driver.o processor_throttling.o
diff --git a/drivers/acpi/acpi_i2c.c b/drivers/acpi/acpi_i2c.c
new file mode 100644
index 000000000000..82045e3f5cac
--- /dev/null
+++ b/drivers/acpi/acpi_i2c.c
@@ -0,0 +1,103 @@
+/*
+ * ACPI I2C enumeration support
+ *
+ * Copyright (C) 2012, Intel Corporation
+ * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/export.h>
+#include <linux/i2c.h>
+#include <linux/ioport.h>
+
+ACPI_MODULE_NAME("i2c");
+
+static int acpi_i2c_add_resource(struct acpi_resource *ares, void *data)
+{
+	struct i2c_board_info *info = data;
+
+	if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
+		struct acpi_resource_i2c_serialbus *sb;
+
+		sb = &ares->data.i2c_serial_bus;
+		if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_I2C) {
+			info->addr = sb->slave_address;
+			if (sb->access_mode == ACPI_I2C_10BIT_MODE)
+				info->flags |= I2C_CLIENT_TEN;
+		}
+	} else if (info->irq < 0) {
+		struct resource r;
+
+		if (acpi_dev_resource_interrupt(ares, 0, &r))
+			info->irq = r.start;
+	}
+
+	/* Tell the ACPI core to skip this resource */
+	return 1;
+}
+
+static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level,
+				       void *data, void **return_value)
+{
+	struct i2c_adapter *adapter = data;
+	struct list_head resource_list;
+	struct i2c_board_info info;
+	struct acpi_device *adev;
+	int ret;
+
+	if (acpi_bus_get_device(handle, &adev))
+		return AE_OK;
+	if (acpi_bus_get_status(adev) || !adev->status.present)
+		return AE_OK;
+
+	memset(&info, 0, sizeof(info));
+	info.acpi_node.handle = handle;
+	info.irq = -1;
+
+	INIT_LIST_HEAD(&resource_list);
+	ret = acpi_dev_get_resources(adev, &resource_list,
+				     acpi_i2c_add_resource, &info);
+	acpi_dev_free_resource_list(&resource_list);
+
+	if (ret < 0 || !info.addr)
+		return AE_OK;
+
+	strlcpy(info.type, dev_name(&adev->dev), sizeof(info.type));
+	if (!i2c_new_device(adapter, &info)) {
+		dev_err(&adapter->dev,
+			"failed to add I2C device %s from ACPI\n",
+			dev_name(&adev->dev));
+	}
+
+	return AE_OK;
+}
+
+/**
+ * acpi_i2c_register_devices - enumerate I2C slave devices behind adapter
+ * @adapter: pointer to adapter
+ *
+ * Enumerate all I2C slave devices behind this adapter by walking the ACPI
+ * namespace. When a device is found it will be added to the Linux device
+ * model and bound to the corresponding ACPI handle.
+ */
+void acpi_i2c_register_devices(struct i2c_adapter *adapter)
+{
+	acpi_handle handle;
+	acpi_status status;
+
+	handle = ACPI_HANDLE(&adapter->dev);
+	if (!handle)
+		return;
+
+	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
+				     acpi_i2c_add_device, NULL,
+				     adapter, NULL);
+	if (ACPI_FAILURE(status))
+		dev_warn(&adapter->dev, "failed to enumerate I2C slaves\n");
+}
+EXPORT_SYMBOL_GPL(acpi_i2c_register_devices);
diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
new file mode 100644
index 000000000000..db129b9f52cb
--- /dev/null
+++ b/drivers/acpi/acpi_platform.c
@@ -0,0 +1,104 @@
+/*
+ * ACPI support for platform bus type.
+ *
+ * Copyright (C) 2012, Intel Corporation
+ * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
+ *          Mathias Nyman <mathias.nyman@linux.intel.com>
+ *          Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include "internal.h"
+
+ACPI_MODULE_NAME("platform");
+
+/**
+ * acpi_create_platform_device - Create platform device for ACPI device node
+ * @adev: ACPI device node to create a platform device for.
+ *
+ * Check if the given @adev can be represented as a platform device and, if
+ * that's the case, create and register a platform device, populate its common
+ * resources and returns a pointer to it.  Otherwise, return %NULL.
+ *
+ * The platform device's name will be taken from the @adev's _HID and _UID.
+ */
+struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
+{
+	struct platform_device *pdev = NULL;
+	struct acpi_device *acpi_parent;
+	struct platform_device_info pdevinfo;
+	struct resource_list_entry *rentry;
+	struct list_head resource_list;
+	struct resource *resources;
+	int count;
+
+	/* If the ACPI node already has a physical device attached, skip it. */
+	if (adev->physical_node_count)
+		return NULL;
+
+	INIT_LIST_HEAD(&resource_list);
+	count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
+	if (count <= 0)
+		return NULL;
+
+	resources = kmalloc(count * sizeof(struct resource), GFP_KERNEL);
+	if (!resources) {
+		dev_err(&adev->dev, "No memory for resources\n");
+		acpi_dev_free_resource_list(&resource_list);
+		return NULL;
+	}
+	count = 0;
+	list_for_each_entry(rentry, &resource_list, node)
+		resources[count++] = rentry->res;
+
+	acpi_dev_free_resource_list(&resource_list);
+
+	memset(&pdevinfo, 0, sizeof(pdevinfo));
+	/*
+	 * If the ACPI node has a parent and that parent has a physical device
+	 * attached to it, that physical device should be the parent of the
+	 * platform device we are about to create.
+	 */
+	pdevinfo.parent = NULL;
+	acpi_parent = adev->parent;
+	if (acpi_parent) {
+		struct acpi_device_physical_node *entry;
+		struct list_head *list;
+
+		mutex_lock(&acpi_parent->physical_node_lock);
+		list = &acpi_parent->physical_node_list;
+		if (!list_empty(list)) {
+			entry = list_first_entry(list,
+					struct acpi_device_physical_node,
+					node);
+			pdevinfo.parent = entry->dev;
+		}
+		mutex_unlock(&acpi_parent->physical_node_lock);
+	}
+	pdevinfo.name = dev_name(&adev->dev);
+	pdevinfo.id = -1;
+	pdevinfo.res = resources;
+	pdevinfo.num_res = count;
+	pdevinfo.acpi_node.handle = adev->handle;
+	pdev = platform_device_register_full(&pdevinfo);
+	if (IS_ERR(pdev)) {
+		dev_err(&adev->dev, "platform device creation failed: %ld\n",
+			PTR_ERR(pdev));
+		pdev = NULL;
+	} else {
+		dev_dbg(&adev->dev, "created platform device %s\n",
+			dev_name(&pdev->dev));
+	}
+
+	kfree(resources);
+	return pdev;
+}
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 08373086cd7e..01551840d236 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -130,46 +130,59 @@ static int acpi_bind_one(struct device *dev, acpi_handle handle)
 {
 	struct acpi_device *acpi_dev;
 	acpi_status status;
-	struct acpi_device_physical_node *physical_node;
+	struct acpi_device_physical_node *physical_node, *pn;
 	char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];
 	int retval = -EINVAL;
 
-	if (dev->archdata.acpi_handle) {
-		dev_warn(dev, "Drivers changed 'acpi_handle'\n");
-		return -EINVAL;
+	if (ACPI_HANDLE(dev)) {
+		if (handle) {
+			dev_warn(dev, "ACPI handle is already set\n");
+			return -EINVAL;
+		} else {
+			handle = ACPI_HANDLE(dev);
+		}
 	}
+	if (!handle)
+		return -EINVAL;
 
 	get_device(dev);
 	status = acpi_bus_get_device(handle, &acpi_dev);
 	if (ACPI_FAILURE(status))
 		goto err;
 
-	physical_node = kzalloc(sizeof(struct acpi_device_physical_node),
-		GFP_KERNEL);
+	physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
 	if (!physical_node) {
 		retval = -ENOMEM;
 		goto err;
 	}
 
 	mutex_lock(&acpi_dev->physical_node_lock);
+
+	/* Sanity check. */
+	list_for_each_entry(pn, &acpi_dev->physical_node_list, node)
+		if (pn->dev == dev) {
+			dev_warn(dev, "Already associated with ACPI node\n");
+			goto err_free;
+		}
+
 	/* allocate physical node id according to physical_node_id_bitmap */
 	physical_node->node_id =
 		find_first_zero_bit(acpi_dev->physical_node_id_bitmap,
 		ACPI_MAX_PHYSICAL_NODE);
 	if (physical_node->node_id >= ACPI_MAX_PHYSICAL_NODE) {
 		retval = -ENOSPC;
-		mutex_unlock(&acpi_dev->physical_node_lock);
-		kfree(physical_node);
-		goto err;
+		goto err_free;
 	}
 
 	set_bit(physical_node->node_id, acpi_dev->physical_node_id_bitmap);
 	physical_node->dev = dev;
 	list_add_tail(&physical_node->node, &acpi_dev->physical_node_list);
 	acpi_dev->physical_node_count++;
+
 	mutex_unlock(&acpi_dev->physical_node_lock);
 
-	dev->archdata.acpi_handle = handle;
+	if (!ACPI_HANDLE(dev))
+		ACPI_HANDLE_SET(dev, acpi_dev->handle);
 
 	if (!physical_node->node_id)
 		strcpy(physical_node_name, PHYSICAL_NODE_STRING);
@@ -187,8 +200,14 @@ static int acpi_bind_one(struct device *dev, acpi_handle handle)
 	return 0;
 
  err:
+	ACPI_HANDLE_SET(dev, NULL);
 	put_device(dev);
 	return retval;
+
+ err_free:
+	mutex_unlock(&acpi_dev->physical_node_lock);
+	kfree(physical_node);
+	goto err;
 }
 
 static int acpi_unbind_one(struct device *dev)
@@ -198,11 +217,10 @@ static int acpi_unbind_one(struct device *dev)
 	acpi_status status;
 	struct list_head *node, *next;
 
-	if (!dev->archdata.acpi_handle)
+	if (!ACPI_HANDLE(dev))
 		return 0;
 
-	status = acpi_bus_get_device(dev->archdata.acpi_handle,
-		&acpi_dev);
+	status = acpi_bus_get_device(ACPI_HANDLE(dev), &acpi_dev);
 	if (ACPI_FAILURE(status))
 		goto err;
 
@@ -228,7 +246,7 @@ static int acpi_unbind_one(struct device *dev)
 
 		sysfs_remove_link(&acpi_dev->dev.kobj, physical_node_name);
 		sysfs_remove_link(&dev->kobj, "firmware_node");
-		dev->archdata.acpi_handle = NULL;
+		ACPI_HANDLE_SET(dev, NULL);
 		/* acpi_bind_one increase refcnt by one */
 		put_device(dev);
 		kfree(entry);
@@ -248,6 +266,10 @@ static int acpi_platform_notify(struct device *dev)
 	acpi_handle handle;
 	int ret = -EINVAL;
 
+	ret = acpi_bind_one(dev, NULL);
+	if (!ret)
+		goto out;
+
 	if (!dev->bus || !dev->parent) {
 		/* bridge devices genernally haven't bus or parent */
 		ret = acpi_find_bridge_device(dev, &handle);
@@ -261,16 +283,16 @@ static int acpi_platform_notify(struct device *dev)
 	}
 	if ((ret = type->find_device(dev, &handle)) != 0)
 		DBG("Can't get handler for %s\n", dev_name(dev));
-      end:
+ end:
 	if (!ret)
 		acpi_bind_one(dev, handle);
 
+ out:
 #if ACPI_GLUE_DEBUG
 	if (!ret) {
 		struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 
-		acpi_get_name(dev->archdata.acpi_handle,
-			      ACPI_FULL_PATHNAME, &buffer);
+		acpi_get_name(dev->acpi_handle, ACPI_FULL_PATHNAME, &buffer);
 		DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
 		kfree(buffer.pointer);
 	} else
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index ca75b9ce0489..57d41f6e1441 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -93,4 +93,11 @@ static inline int suspend_nvs_save(void) { return 0; }
 static inline void suspend_nvs_restore(void) {}
 #endif
 
+/*--------------------------------------------------------------------------
+				Platform bus support
+  -------------------------------------------------------------------------- */
+struct platform_device;
+
+struct platform_device *acpi_create_platform_device(struct acpi_device *adev);
+
 #endif /* _ACPI_INTERNAL_H_ */
diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index 0eefa12e648c..1be25a590dce 100644
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -495,11 +495,6 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
 	return 0;
 }
 
-/* FIXME: implement x86/x86_64 version */
-void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
-{
-}
-
 void acpi_pci_irq_disable(struct pci_dev *dev)
 {
 	struct acpi_prt_entry *entry;
diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
new file mode 100644
index 000000000000..a3868f6c222a
--- /dev/null
+++ b/drivers/acpi/resource.c
@@ -0,0 +1,526 @@
+/*
+ * drivers/acpi/resource.c - ACPI device resources interpretation.
+ *
+ * Copyright (C) 2012, Intel Corp.
+ * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/export.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+
+#ifdef CONFIG_X86
+#define valid_IRQ(i) (((i) != 0) && ((i) != 2))
+#else
+#define valid_IRQ(i) (true)
+#endif
+
+static unsigned long acpi_dev_memresource_flags(u64 len, u8 write_protect,
+						bool window)
+{
+	unsigned long flags = IORESOURCE_MEM;
+
+	if (len == 0)
+		flags |= IORESOURCE_DISABLED;
+
+	if (write_protect == ACPI_READ_WRITE_MEMORY)
+		flags |= IORESOURCE_MEM_WRITEABLE;
+
+	if (window)
+		flags |= IORESOURCE_WINDOW;
+
+	return flags;
+}
+
+static void acpi_dev_get_memresource(struct resource *res, u64 start, u64 len,
+				     u8 write_protect)
+{
+	res->start = start;
+	res->end = start + len - 1;
+	res->flags = acpi_dev_memresource_flags(len, write_protect, false);
+}
+
+/**
+ * acpi_dev_resource_memory - Extract ACPI memory resource information.
+ * @ares: Input ACPI resource object.
+ * @res: Output generic resource object.
+ *
+ * Check if the given ACPI resource object represents a memory resource and
+ * if that's the case, use the information in it to populate the generic
+ * resource object pointed to by @res.
+ */
+bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res)
+{
+	struct acpi_resource_memory24 *memory24;
+	struct acpi_resource_memory32 *memory32;
+	struct acpi_resource_fixed_memory32 *fixed_memory32;
+
+	switch (ares->type) {
+	case ACPI_RESOURCE_TYPE_MEMORY24:
+		memory24 = &ares->data.memory24;
+		acpi_dev_get_memresource(res, memory24->minimum,
+					 memory24->address_length,
+					 memory24->write_protect);
+		break;
+	case ACPI_RESOURCE_TYPE_MEMORY32:
+		memory32 = &ares->data.memory32;
+		acpi_dev_get_memresource(res, memory32->minimum,
+					 memory32->address_length,
+					 memory32->write_protect);
+		break;
+	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
+		fixed_memory32 = &ares->data.fixed_memory32;
+		acpi_dev_get_memresource(res, fixed_memory32->address,
+					 fixed_memory32->address_length,
+					 fixed_memory32->write_protect);
+		break;
+	default:
+		return false;
+	}
+	return true;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_resource_memory);
+
+static unsigned int acpi_dev_ioresource_flags(u64 start, u64 end, u8 io_decode,
+					      bool window)
+{
+	int flags = IORESOURCE_IO;
+
+	if (io_decode == ACPI_DECODE_16)
+		flags |= IORESOURCE_IO_16BIT_ADDR;
+
+	if (start > end || end >= 0x10003)
+		flags |= IORESOURCE_DISABLED;
+
+	if (window)
+		flags |= IORESOURCE_WINDOW;
+
+	return flags;
+}
+
+static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len,
+				    u8 io_decode)
+{
+	u64 end = start + len - 1;
+
+	res->start = start;
+	res->end = end;
+	res->flags = acpi_dev_ioresource_flags(start, end, io_decode, false);
+}
+
+/**
+ * acpi_dev_resource_io - Extract ACPI I/O resource information.
+ * @ares: Input ACPI resource object.
+ * @res: Output generic resource object.
+ *
+ * Check if the given ACPI resource object represents an I/O resource and
+ * if that's the case, use the information in it to populate the generic
+ * resource object pointed to by @res.
+ */
+bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
+{
+	struct acpi_resource_io *io;
+	struct acpi_resource_fixed_io *fixed_io;
+
+	switch (ares->type) {
+	case ACPI_RESOURCE_TYPE_IO:
+		io = &ares->data.io;
+		acpi_dev_get_ioresource(res, io->minimum,
+					io->address_length,
+					io->io_decode);
+		break;
+	case ACPI_RESOURCE_TYPE_FIXED_IO:
+		fixed_io = &ares->data.fixed_io;
+		acpi_dev_get_ioresource(res, fixed_io->address,
+					fixed_io->address_length,
+					ACPI_DECODE_10);
+		break;
+	default:
+		return false;
+	}
+	return true;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_resource_io);
+
+/**
+ * acpi_dev_resource_address_space - Extract ACPI address space information.
+ * @ares: Input ACPI resource object.
+ * @res: Output generic resource object.
+ *
+ * Check if the given ACPI resource object represents an address space resource
+ * and if that's the case, use the information in it to populate the generic
+ * resource object pointed to by @res.
+ */
+bool acpi_dev_resource_address_space(struct acpi_resource *ares,
+				     struct resource *res)
+{
+	acpi_status status;
+	struct acpi_resource_address64 addr;
+	bool window;
+	u64 len;
+	u8 io_decode;
+
+	switch (ares->type) {
+	case ACPI_RESOURCE_TYPE_ADDRESS16:
+	case ACPI_RESOURCE_TYPE_ADDRESS32:
+	case ACPI_RESOURCE_TYPE_ADDRESS64:
+		break;
+	default:
+		return false;
+	}
+
+	status = acpi_resource_to_address64(ares, &addr);
+	if (ACPI_FAILURE(status))
+		return true;
+
+	res->start = addr.minimum;
+	res->end = addr.maximum;
+	window = addr.producer_consumer == ACPI_PRODUCER;
+
+	switch(addr.resource_type) {
+	case ACPI_MEMORY_RANGE:
+		len = addr.maximum - addr.minimum + 1;
+		res->flags = acpi_dev_memresource_flags(len,
+						addr.info.mem.write_protect,
+						window);
+		break;
+	case ACPI_IO_RANGE:
+		io_decode = addr.granularity == 0xfff ?
+				ACPI_DECODE_10 : ACPI_DECODE_16;
+		res->flags = acpi_dev_ioresource_flags(addr.minimum,
+						       addr.maximum,
+						       io_decode, window);
+		break;
+	case ACPI_BUS_NUMBER_RANGE:
+		res->flags = IORESOURCE_BUS;
+		break;
+	default:
+		res->flags = 0;
+	}
+
+	return true;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space);
+
+/**
+ * acpi_dev_resource_ext_address_space - Extract ACPI address space information.
+ * @ares: Input ACPI resource object.
+ * @res: Output generic resource object.
+ *
+ * Check if the given ACPI resource object represents an extended address space
+ * resource and if that's the case, use the information in it to populate the
+ * generic resource object pointed to by @res.
+ */
+bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,
+					 struct resource *res)
+{
+	struct acpi_resource_extended_address64 *ext_addr;
+	bool window;
+	u64 len;
+	u8 io_decode;
+
+	if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64)
+		return false;
+
+	ext_addr = &ares->data.ext_address64;
+
+	res->start = ext_addr->minimum;
+	res->end = ext_addr->maximum;
+	window = ext_addr->producer_consumer == ACPI_PRODUCER;
+
+	switch(ext_addr->resource_type) {
+	case ACPI_MEMORY_RANGE:
+		len = ext_addr->maximum - ext_addr->minimum + 1;
+		res->flags = acpi_dev_memresource_flags(len,
+					ext_addr->info.mem.write_protect,
+					window);
+		break;
+	case ACPI_IO_RANGE:
+		io_decode = ext_addr->granularity == 0xfff ?
+				ACPI_DECODE_10 : ACPI_DECODE_16;
+		res->flags = acpi_dev_ioresource_flags(ext_addr->minimum,
+						       ext_addr->maximum,
+						       io_decode, window);
+		break;
+	case ACPI_BUS_NUMBER_RANGE:
+		res->flags = IORESOURCE_BUS;
+		break;
+	default:
+		res->flags = 0;
+	}
+
+	return true;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space);
+
+/**
+ * acpi_dev_irq_flags - Determine IRQ resource flags.
+ * @triggering: Triggering type as provided by ACPI.
+ * @polarity: Interrupt polarity as provided by ACPI.
+ * @shareable: Whether or not the interrupt is shareable.
+ */
+unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable)
+{
+	unsigned long flags;
+
+	if (triggering == ACPI_LEVEL_SENSITIVE)
+		flags = polarity == ACPI_ACTIVE_LOW ?
+			IORESOURCE_IRQ_LOWLEVEL : IORESOURCE_IRQ_HIGHLEVEL;
+	else
+		flags = polarity == ACPI_ACTIVE_LOW ?
+			IORESOURCE_IRQ_LOWEDGE : IORESOURCE_IRQ_HIGHEDGE;
+
+	if (shareable == ACPI_SHARED)
+		flags |= IORESOURCE_IRQ_SHAREABLE;
+
+	return flags | IORESOURCE_IRQ;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_irq_flags);
+
+static void acpi_dev_irqresource_disabled(struct resource *res, u32 gsi)
+{
+	res->start = gsi;
+	res->end = gsi;
+	res->flags = IORESOURCE_IRQ | IORESOURCE_DISABLED;
+}
+
+static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
+				     u8 triggering, u8 polarity, u8 shareable)
+{
+	int irq, p, t;
+
+	if (!valid_IRQ(gsi)) {
+		acpi_dev_irqresource_disabled(res, gsi);
+		return;
+	}
+
+	/*
+	 * In IO-APIC mode, use overrided attribute. Two reasons:
+	 * 1. BIOS bug in DSDT
+	 * 2. BIOS uses IO-APIC mode Interrupt Source Override
+	 */
+	if (!acpi_get_override_irq(gsi, &t, &p)) {
+		u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
+		u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
+
+		if (triggering != trig || polarity != pol) {
+			pr_warning("ACPI: IRQ %d override to %s, %s\n", gsi,
+				   t ? "edge" : "level", p ? "low" : "high");
+			triggering = trig;
+			polarity = pol;
+		}
+	}
+
+	res->flags = acpi_dev_irq_flags(triggering, polarity, shareable);
+	irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
+	if (irq >= 0) {
+		res->start = irq;
+		res->end = irq;
+	} else {
+		acpi_dev_irqresource_disabled(res, gsi);
+	}
+}
+
+/**
+ * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information.
+ * @ares: Input ACPI resource object.
+ * @index: Index into the array of GSIs represented by the resource.
+ * @res: Output generic resource object.
+ *
+ * Check if the given ACPI resource object represents an interrupt resource
+ * and @index does not exceed the resource's interrupt count (true is returned
+ * in that case regardless of the results of the other checks)).  If that's the
+ * case, register the GSI corresponding to @index from the array of interrupts
+ * represented by the resource and populate the generic resource object pointed
+ * to by @res accordingly.  If the registration of the GSI is not successful,
+ * IORESOURCE_DISABLED will be set it that object's flags.
+ */
+bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
+				 struct resource *res)
+{
+	struct acpi_resource_irq *irq;
+	struct acpi_resource_extended_irq *ext_irq;
+
+	switch (ares->type) {
+	case ACPI_RESOURCE_TYPE_IRQ:
+		/*
+		 * Per spec, only one interrupt per descriptor is allowed in
+		 * _CRS, but some firmware violates this, so parse them all.
+		 */
+		irq = &ares->data.irq;
+		if (index >= irq->interrupt_count) {
+			acpi_dev_irqresource_disabled(res, 0);
+			return false;
+		}
+		acpi_dev_get_irqresource(res, irq->interrupts[index],
+					 irq->triggering, irq->polarity,
+					 irq->sharable);
+		break;
+	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
+		ext_irq = &ares->data.extended_irq;
+		if (index >= ext_irq->interrupt_count) {
+			acpi_dev_irqresource_disabled(res, 0);
+			return false;
+		}
+		acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
+					 ext_irq->triggering, ext_irq->polarity,
+					 ext_irq->sharable);
+		break;
+	default:
+		return false;
+	}
+
+	return true;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt);
+
+/**
+ * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources().
+ * @list: The head of the resource list to free.
+ */
+void acpi_dev_free_resource_list(struct list_head *list)
+{
+	struct resource_list_entry *rentry, *re;
+
+	list_for_each_entry_safe(rentry, re, list, node) {
+		list_del(&rentry->node);
+		kfree(rentry);
+	}
+}
+EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list);
+
+struct res_proc_context {
+	struct list_head *list;
+	int (*preproc)(struct acpi_resource *, void *);
+	void *preproc_data;
+	int count;
+	int error;
+};
+
+static acpi_status acpi_dev_new_resource_entry(struct resource *r,
+					       struct res_proc_context *c)
+{
+	struct resource_list_entry *rentry;
+
+	rentry = kmalloc(sizeof(*rentry), GFP_KERNEL);
+	if (!rentry) {
+		c->error = -ENOMEM;
+		return AE_NO_MEMORY;
+	}
+	rentry->res = *r;
+	list_add_tail(&rentry->node, c->list);
+	c->count++;
+	return AE_OK;
+}
+
+static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
+					     void *context)
+{
+	struct res_proc_context *c = context;
+	struct resource r;
+	int i;
+
+	if (c->preproc) {
+		int ret;
+
+		ret = c->preproc(ares, c->preproc_data);
+		if (ret < 0) {
+			c->error = ret;
+			return AE_CTRL_TERMINATE;
+		} else if (ret > 0) {
+			return AE_OK;
+		}
+	}
+
+	memset(&r, 0, sizeof(r));
+
+	if (acpi_dev_resource_memory(ares, &r)
+	    || acpi_dev_resource_io(ares, &r)
+	    || acpi_dev_resource_address_space(ares, &r)
+	    || acpi_dev_resource_ext_address_space(ares, &r))
+		return acpi_dev_new_resource_entry(&r, c);
+
+	for (i = 0; acpi_dev_resource_interrupt(ares, i, &r); i++) {
+		acpi_status status;
+
+		status = acpi_dev_new_resource_entry(&r, c);
+		if (ACPI_FAILURE(status))
+			return status;
+	}
+
+	return AE_OK;
+}
+
+/**
+ * acpi_dev_get_resources - Get current resources of a device.
+ * @adev: ACPI device node to get the resources for.
+ * @list: Head of the resultant list of resources (must be empty).
+ * @preproc: The caller's preprocessing routine.
+ * @preproc_data: Pointer passed to the caller's preprocessing routine.
+ *
+ * Evaluate the _CRS method for the given device node and process its output by
+ * (1) executing the @preproc() rountine provided by the caller, passing the
+ * resource pointer and @preproc_data to it as arguments, for each ACPI resource
+ * returned and (2) converting all of the returned ACPI resources into struct
+ * resource objects if possible.  If the return value of @preproc() in step (1)
+ * is different from 0, step (2) is not applied to the given ACPI resource and
+ * if that value is negative, the whole processing is aborted and that value is
+ * returned as the final error code.
+ *
+ * The resultant struct resource objects are put on the list pointed to by
+ * @list, that must be empty initially, as members of struct resource_list_entry
+ * objects.  Callers of this routine should use %acpi_dev_free_resource_list() to
+ * free that list.
+ *
+ * The number of resources in the output list is returned on success, an error
+ * code reflecting the error condition is returned otherwise.
+ */
+int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
+			   int (*preproc)(struct acpi_resource *, void *),
+			   void *preproc_data)
+{
+	struct res_proc_context c;
+	acpi_handle not_used;
+	acpi_status status;
+
+	if (!adev || !adev->handle || !list_empty(list))
+		return -EINVAL;
+
+	status = acpi_get_handle(adev->handle, METHOD_NAME__CRS, &not_used);
+	if (ACPI_FAILURE(status))
+		return 0;
+
+	c.list = list;
+	c.preproc = preproc;
+	c.preproc_data = preproc_data;
+	c.count = 0;
+	c.error = 0;
+	status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
+				     acpi_dev_process_resource, &c);
+	if (ACPI_FAILURE(status)) {
+		acpi_dev_free_resource_list(list);
+		return c.error ? c.error : -EIO;
+	}
+
+	return c.count;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_get_resources);
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index da1416af0c8b..d59a60736e1c 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -29,6 +29,17 @@ 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" },
+
+	{ }
+};
+
 static LIST_HEAD(acpi_device_list);
 static LIST_HEAD(acpi_bus_id_list);
 DEFINE_MUTEX(acpi_device_lock);
@@ -340,8 +351,8 @@ static void acpi_device_remove_files(struct acpi_device *dev)
 			ACPI Bus operations
    -------------------------------------------------------------------------- */
 
-int acpi_match_device_ids(struct acpi_device *device,
-			  const struct acpi_device_id *ids)
+static const struct acpi_device_id *__acpi_match_device(
+	struct acpi_device *device, const struct acpi_device_id *ids)
 {
 	const struct acpi_device_id *id;
 	struct acpi_hardware_id *hwid;
@@ -351,14 +362,44 @@ int acpi_match_device_ids(struct acpi_device *device,
 	 * driver for it.
 	 */
 	if (!device->status.present)
-		return -ENODEV;
+		return NULL;
 
 	for (id = ids; id->id[0]; id++)
 		list_for_each_entry(hwid, &device->pnp.ids, list)
 			if (!strcmp((char *) id->id, hwid->id))
-				return 0;
+				return id;
+
+	return NULL;
+}
+
+/**
+ * acpi_match_device - Match a struct device against a given list of ACPI IDs
+ * @ids: Array of struct acpi_device_id object to match against.
+ * @dev: The device structure to match.
+ *
+ * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
+ * object for that handle and use that object to match against a given list of
+ * device IDs.
+ *
+ * Return a pointer to the first matching ID on success or %NULL on failure.
+ */
+const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
+					       const struct device *dev)
+{
+	struct acpi_device *adev;
+
+	if (!ids || !ACPI_HANDLE(dev)
+	    || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
+		return NULL;
 
-	return -ENOENT;
+	return __acpi_match_device(adev, ids);
+}
+EXPORT_SYMBOL_GPL(acpi_match_device);
+
+int acpi_match_device_ids(struct acpi_device *device,
+			  const struct acpi_device_id *ids)
+{
+	return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 }
 EXPORT_SYMBOL(acpi_match_device_ids);
 
@@ -1490,8 +1531,13 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
 	 */
 	device = NULL;
 	acpi_bus_get_device(handle, &device);
-	if (ops->acpi_op_add && !device)
+	if (ops->acpi_op_add && !device) {
 		acpi_add_single_object(&device, handle, type, sta, ops);
+		/* Is the device a known good platform device? */
+		if (device
+		    && !acpi_match_device_ids(device, acpi_platform_device_ids))
+			acpi_create_platform_device(device);
+	}
 
 	if (!device)
 		return AE_CTRL_DEPTH;