1 files changed, 232 insertions, 233 deletions

diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 3937adf4e5e..f774c65ecb8 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -6,37 +6,47 @@
  *
  * This file is released under the GPLv2.
  */
+#include <linux/export.h>
 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/device.h>
+#include <linux/slab.h>
 #include <linux/rwsem.h>
 #include <linux/acpi.h>
 
+#include "internal.h"
+
 #define ACPI_GLUE_DEBUG	0
 #if ACPI_GLUE_DEBUG
-#define DBG(x...) printk(PREFIX x)
+#define DBG(fmt, ...)						\
+	printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__)
 #else
-#define DBG(x...)
+#define DBG(fmt, ...)						\
+do {								\
+	if (0)							\
+		printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__);	\
+} while (0)
 #endif
 static LIST_HEAD(bus_type_list);
 static DECLARE_RWSEM(bus_type_sem);
 
+#define PHYSICAL_NODE_STRING "physical_node"
+#define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10)
+
 int register_acpi_bus_type(struct acpi_bus_type *type)
 {
 	if (acpi_disabled)
 		return -ENODEV;
-	if (type && type->bus && type->find_device) {
+	if (type && type->match && type->find_companion) {
 		down_write(&bus_type_sem);
 		list_add_tail(&type->list, &bus_type_list);
 		up_write(&bus_type_sem);
-		printk(KERN_INFO PREFIX "bus type %s registered\n",
-		       type->bus->name);
+		printk(KERN_INFO PREFIX "bus type %s registered\n", type->name);
 		return 0;
 	}
 	return -ENODEV;
 }
-
-EXPORT_SYMBOL(register_acpi_bus_type);
+EXPORT_SYMBOL_GPL(register_acpi_bus_type);
 
 int unregister_acpi_bus_type(struct acpi_bus_type *type)
 {
@@ -46,22 +56,21 @@ int unregister_acpi_bus_type(struct acpi_bus_type *type)
 		down_write(&bus_type_sem);
 		list_del_init(&type->list);
 		up_write(&bus_type_sem);
-		printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
-		       type->bus->name);
+		printk(KERN_INFO PREFIX "bus type %s unregistered\n",
+		       type->name);
 		return 0;
 	}
 	return -ENODEV;
 }
+EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
 
-EXPORT_SYMBOL(unregister_acpi_bus_type);
-
-static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
+static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
 {
 	struct acpi_bus_type *tmp, *ret = NULL;
 
 	down_read(&bus_type_sem);
 	list_for_each_entry(tmp, &bus_type_list, list) {
-		if (tmp->bus == type) {
+		if (tmp->match(dev)) {
 			ret = tmp;
 			break;
 		}
@@ -70,268 +79,250 @@ static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
 	return ret;
 }
 
-static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
+#define FIND_CHILD_MIN_SCORE	1
+#define FIND_CHILD_MAX_SCORE	2
+
+static int find_child_checks(struct acpi_device *adev, bool check_children)
 {
-	struct acpi_bus_type *tmp;
-	int ret = -ENODEV;
+	bool sta_present = true;
+	unsigned long long sta;
+	acpi_status status;
 
-	down_read(&bus_type_sem);
-	list_for_each_entry(tmp, &bus_type_list, list) {
-		if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
-			ret = 0;
-			break;
-		}
-	}
-	up_read(&bus_type_sem);
-	return ret;
-}
+	status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
+	if (status == AE_NOT_FOUND)
+		sta_present = false;
+	else if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED))
+		return -ENODEV;
+
+	if (check_children && list_empty(&adev->children))
+		return -ENODEV;
 
-/* Get PCI root bridge's handle from its segment and bus number */
-struct acpi_find_pci_root {
-	unsigned int seg;
-	unsigned int bus;
-	acpi_handle handle;
-};
+	return sta_present ? FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE;
+}
 
-static acpi_status
-do_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
+struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
+					   u64 address, bool check_children)
 {
-	unsigned long *busnr = (unsigned long *)data;
-	struct acpi_resource_address64 address;
+	struct acpi_device *adev, *ret = NULL;
+	int ret_score = 0;
 
-	if (resource->id != ACPI_RSTYPE_ADDRESS16 &&
-	    resource->id != ACPI_RSTYPE_ADDRESS32 &&
-	    resource->id != ACPI_RSTYPE_ADDRESS64)
-		return AE_OK;
+	if (!parent)
+		return NULL;
 
-	acpi_resource_to_address64(resource, &address);
-	if ((address.address_length > 0) &&
-	    (address.resource_type == ACPI_BUS_NUMBER_RANGE))
-		*busnr = address.min_address_range;
+	list_for_each_entry(adev, &parent->children, node) {
+		unsigned long long addr;
+		acpi_status status;
+		int score;
 
-	return AE_OK;
-}
+		status = acpi_evaluate_integer(adev->handle, METHOD_NAME__ADR,
+					       NULL, &addr);
+		if (ACPI_FAILURE(status) || addr != address)
+			continue;
 
-static int get_root_bridge_busnr(acpi_handle handle)
-{
-	acpi_status status;
-	unsigned long bus, bbn;
-	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
-
-	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
-
-	status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, NULL,
-				       &bbn);
-	if (status == AE_NOT_FOUND) {
-		/* Assume bus = 0 */
-		printk(KERN_INFO PREFIX
-		       "Assume root bridge [%s] bus is 0\n",
-		       (char *)buffer.pointer);
-		status = AE_OK;
-		bbn = 0;
-	}
-	if (ACPI_FAILURE(status)) {
-		bbn = -ENODEV;
-		goto exit;
-	}
-	if (bbn > 0)
-		goto exit;
-
-	/* _BBN in some systems return 0 for all root bridges */
-	bus = -1;
-	status = acpi_walk_resources(handle, METHOD_NAME__CRS,
-				     do_root_bridge_busnr_callback, &bus);
-	/* If _CRS failed, we just use _BBN */
-	if (ACPI_FAILURE(status) || (bus == -1))
-		goto exit;
-	/* We select _CRS */
-	if (bbn != bus) {
-		printk(KERN_INFO PREFIX
-		       "_BBN and _CRS returns different value for %s. Select _CRS\n",
-		       (char *)buffer.pointer);
-		bbn = bus;
+		if (!ret) {
+			/* This is the first matching object.  Save it. */
+			ret = adev;
+			continue;
+		}
+		/*
+		 * There is more than one matching device object with the same
+		 * _ADR value.  That really is unexpected, so we are kind of
+		 * beyond the scope of the spec here.  We have to choose which
+		 * one to return, though.
+		 *
+		 * First, check if the previously found object is good enough
+		 * and return it if so.  Second, do the same for the object that
+		 * we've just found.
+		 */
+		if (!ret_score) {
+			ret_score = find_child_checks(ret, check_children);
+			if (ret_score == FIND_CHILD_MAX_SCORE)
+				return ret;
+		}
+		score = find_child_checks(adev, check_children);
+		if (score == FIND_CHILD_MAX_SCORE) {
+			return adev;
+		} else if (score > ret_score) {
+			ret = adev;
+			ret_score = score;
+		}
 	}
-      exit:
-	acpi_os_free(buffer.pointer);
-	return (int)bbn;
+	return ret;
 }
+EXPORT_SYMBOL_GPL(acpi_find_child_device);
 
-static acpi_status
-find_pci_rootbridge(acpi_handle handle, u32 lvl, void *context, void **rv)
+static void acpi_physnode_link_name(char *buf, unsigned int node_id)
 {
-	struct acpi_find_pci_root *find = (struct acpi_find_pci_root *)context;
-	unsigned long seg, bus;
-	acpi_status status;
-	int tmp;
-	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
-
-	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
+	if (node_id > 0)
+		snprintf(buf, PHYSICAL_NODE_NAME_SIZE,
+			 PHYSICAL_NODE_STRING "%u", node_id);
+	else
+		strcpy(buf, PHYSICAL_NODE_STRING);
+}
 
-	status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, &seg);
-	if (status == AE_NOT_FOUND) {
-		/* Assume seg = 0 */
-		status = AE_OK;
-		seg = 0;
+int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
+{
+	struct acpi_device_physical_node *physical_node, *pn;
+	char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
+	struct list_head *physnode_list;
+	unsigned int node_id;
+	int retval = -EINVAL;
+
+	if (ACPI_COMPANION(dev)) {
+		if (acpi_dev) {
+			dev_warn(dev, "ACPI companion already set\n");
+			return -EINVAL;
+		} else {
+			acpi_dev = ACPI_COMPANION(dev);
+		}
 	}
-	if (ACPI_FAILURE(status)) {
-		status = AE_CTRL_DEPTH;
-		goto exit;
+	if (!acpi_dev)
+		return -EINVAL;
+
+	get_device(&acpi_dev->dev);
+	get_device(dev);
+	physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
+	if (!physical_node) {
+		retval = -ENOMEM;
+		goto err;
 	}
 
-	tmp = get_root_bridge_busnr(handle);
-	if (tmp < 0) {
-		printk(KERN_ERR PREFIX
-		       "Find root bridge failed for %s\n",
-		       (char *)buffer.pointer);
-		status = AE_CTRL_DEPTH;
-		goto exit;
+	mutex_lock(&acpi_dev->physical_node_lock);
+
+	/*
+	 * Keep the list sorted by node_id so that the IDs of removed nodes can
+	 * be recycled easily.
+	 */
+	physnode_list = &acpi_dev->physical_node_list;
+	node_id = 0;
+	list_for_each_entry(pn, &acpi_dev->physical_node_list, node) {
+		/* Sanity check. */
+		if (pn->dev == dev) {
+			mutex_unlock(&acpi_dev->physical_node_lock);
+
+			dev_warn(dev, "Already associated with ACPI node\n");
+			kfree(physical_node);
+			if (ACPI_COMPANION(dev) != acpi_dev)
+				goto err;
+
+			put_device(dev);
+			put_device(&acpi_dev->dev);
+			return 0;
+		}
+		if (pn->node_id == node_id) {
+			physnode_list = &pn->node;
+			node_id++;
+		}
 	}
-	bus = tmp;
-
-	if (seg == find->seg && bus == find->bus)
-		find->handle = handle;
-	status = AE_OK;
-      exit:
-	acpi_os_free(buffer.pointer);
-	return status;
-}
 
-acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
-{
-	struct acpi_find_pci_root find = { seg, bus, NULL };
+	physical_node->node_id = node_id;
+	physical_node->dev = dev;
+	list_add(&physical_node->node, physnode_list);
+	acpi_dev->physical_node_count++;
 
-	acpi_get_devices(PCI_ROOT_HID_STRING, find_pci_rootbridge, &find, NULL);
-	return find.handle;
-}
+	if (!ACPI_COMPANION(dev))
+		ACPI_COMPANION_SET(dev, acpi_dev);
 
-/* Get device's handler per its address under its parent */
-struct acpi_find_child {
-	acpi_handle handle;
-	acpi_integer address;
-};
+	acpi_physnode_link_name(physical_node_name, node_id);
+	retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
+				   physical_node_name);
+	if (retval)
+		dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n",
+			physical_node_name, retval);
 
-static acpi_status
-do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv)
-{
-	acpi_status status;
-	struct acpi_device_info *info;
-	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
-	struct acpi_find_child *find = (struct acpi_find_child *)context;
-
-	status = acpi_get_object_info(handle, &buffer);
-	if (ACPI_SUCCESS(status)) {
-		info = buffer.pointer;
-		if (info->address == find->address)
-			find->handle = handle;
-		acpi_os_free(buffer.pointer);
-	}
-	return AE_OK;
-}
+	retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
+				   "firmware_node");
+	if (retval)
+		dev_err(dev, "Failed to create link firmware_node (%d)\n",
+			retval);
 
-acpi_handle acpi_get_child(acpi_handle parent, acpi_integer address)
-{
-	struct acpi_find_child find = { NULL, address };
+	mutex_unlock(&acpi_dev->physical_node_lock);
 
-	if (!parent)
-		return NULL;
-	acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
-			    1, do_acpi_find_child, &find, NULL);
-	return find.handle;
-}
+	if (acpi_dev->wakeup.flags.valid)
+		device_set_wakeup_capable(dev, true);
 
-EXPORT_SYMBOL(acpi_get_child);
+	return 0;
 
-/* Link ACPI devices with physical devices */
-static void acpi_glue_data_handler(acpi_handle handle,
-				   u32 function, void *context)
-{
-	/* we provide an empty handler */
+ err:
+	ACPI_COMPANION_SET(dev, NULL);
+	put_device(dev);
+	put_device(&acpi_dev->dev);
+	return retval;
 }
+EXPORT_SYMBOL_GPL(acpi_bind_one);
 
-/* Note: a success call will increase reference count by one */
-struct device *acpi_get_physical_device(acpi_handle handle)
+int acpi_unbind_one(struct device *dev)
 {
-	acpi_status status;
-	struct device *dev;
+	struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
+	struct acpi_device_physical_node *entry;
 
-	status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
-	if (ACPI_SUCCESS(status))
-		return get_device(dev);
-	return NULL;
-}
+	if (!acpi_dev)
+		return 0;
 
-EXPORT_SYMBOL(acpi_get_physical_device);
+	mutex_lock(&acpi_dev->physical_node_lock);
 
-static int acpi_bind_one(struct device *dev, acpi_handle handle)
-{
-	acpi_status status;
+	list_for_each_entry(entry, &acpi_dev->physical_node_list, node)
+		if (entry->dev == dev) {
+			char physnode_name[PHYSICAL_NODE_NAME_SIZE];
 
-	if (dev->firmware_data) {
-		printk(KERN_WARNING PREFIX
-		       "Drivers changed 'firmware_data' for %s\n", dev->bus_id);
-		return -EINVAL;
-	}
-	get_device(dev);
-	status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
-	if (ACPI_FAILURE(status)) {
-		put_device(dev);
-		return -EINVAL;
-	}
-	dev->firmware_data = handle;
+			list_del(&entry->node);
+			acpi_dev->physical_node_count--;
 
-	return 0;
-}
+			acpi_physnode_link_name(physnode_name, entry->node_id);
+			sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name);
+			sysfs_remove_link(&dev->kobj, "firmware_node");
+			ACPI_COMPANION_SET(dev, NULL);
+			/* Drop references taken by acpi_bind_one(). */
+			put_device(dev);
+			put_device(&acpi_dev->dev);
+			kfree(entry);
+			break;
+		}
 
-static int acpi_unbind_one(struct device *dev)
-{
-	if (!dev->firmware_data)
-		return 0;
-	if (dev == acpi_get_physical_device(dev->firmware_data)) {
-		/* acpi_get_physical_device increase refcnt by one */
-		put_device(dev);
-		acpi_detach_data(dev->firmware_data, acpi_glue_data_handler);
-		dev->firmware_data = NULL;
-		/* acpi_bind_one increase refcnt by one */
-		put_device(dev);
-	} else {
-		printk(KERN_ERR PREFIX
-		       "Oops, 'firmware_data' corrupt for %s\n", dev->bus_id);
-	}
+	mutex_unlock(&acpi_dev->physical_node_lock);
 	return 0;
 }
+EXPORT_SYMBOL_GPL(acpi_unbind_one);
 
 static int acpi_platform_notify(struct device *dev)
 {
-	struct acpi_bus_type *type;
-	acpi_handle handle;
-	int ret = -EINVAL;
-
-	if (!dev->bus || !dev->parent) {
-		/* bridge devices genernally haven't bus or parent */
-		ret = acpi_find_bridge_device(dev, &handle);
-		goto end;
-	}
-	type = acpi_get_bus_type(dev->bus);
-	if (!type) {
-		DBG("No ACPI bus support for %s\n", dev->bus_id);
-		ret = -EINVAL;
-		goto end;
+	struct acpi_bus_type *type = acpi_get_bus_type(dev);
+	struct acpi_device *adev;
+	int ret;
+
+	ret = acpi_bind_one(dev, NULL);
+	if (ret && type) {
+		struct acpi_device *adev;
+
+		adev = type->find_companion(dev);
+		if (!adev) {
+			DBG("Unable to get handle for %s\n", dev_name(dev));
+			ret = -ENODEV;
+			goto out;
+		}
+		ret = acpi_bind_one(dev, adev);
+		if (ret)
+			goto out;
 	}
-	if ((ret = type->find_device(dev, &handle)) != 0)
-		DBG("Can't get handler for %s\n", dev->bus_id);
-      end:
-	if (!ret)
-		acpi_bind_one(dev, handle);
+	adev = ACPI_COMPANION(dev);
+	if (!adev)
+		goto out;
+
+	if (type && type->setup)
+		type->setup(dev);
+	else if (adev->handler && adev->handler->bind)
+		adev->handler->bind(dev);
 
+ out:
 #if ACPI_GLUE_DEBUG
 	if (!ret) {
 		struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 
-		acpi_get_name(dev->firmware_data, ACPI_FULL_PATHNAME, &buffer);
-		DBG("Device %s -> %s\n", dev->bus_id, (char *)buffer.pointer);
-		acpi_os_free(buffer.pointer);
+		acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
+		DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
+		kfree(buffer.pointer);
 	} else
-		DBG("Device %s -> No ACPI support\n", dev->bus_id);
+		DBG("Device %s -> No ACPI support\n", dev_name(dev));
 #endif
 
 	return ret;
@@ -339,14 +330,24 @@ static int acpi_platform_notify(struct device *dev)
 
 static int acpi_platform_notify_remove(struct device *dev)
 {
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+	struct acpi_bus_type *type;
+
+	if (!adev)
+		return 0;
+
+	type = acpi_get_bus_type(dev);
+	if (type && type->cleanup)
+		type->cleanup(dev);
+	else if (adev->handler && adev->handler->unbind)
+		adev->handler->unbind(dev);
+
 	acpi_unbind_one(dev);
 	return 0;
 }
 
-static int __init init_acpi_device_notify(void)
+int __init init_acpi_device_notify(void)
 {
-	if (acpi_disabled)
-		return 0;
 	if (platform_notify || platform_notify_remove) {
 		printk(KERN_ERR PREFIX "Can't use platform_notify\n");
 		return 0;
@@ -355,5 +356,3 @@ static int __init init_acpi_device_notify(void)
 	platform_notify_remove = acpi_platform_notify_remove;
 	return 0;
 }
-
-arch_initcall(init_acpi_device_notify);