1 files changed, 239 insertions, 224 deletions

diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index eda0978b57c..f774c65ecb8 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -6,35 +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...) do { } while(0)
+#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_GPL(register_acpi_bus_type);
 
 int unregister_acpi_bus_type(struct acpi_bus_type *type)
 {
@@ -44,20 +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);
 
-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;
 		}
@@ -66,152 +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;
 
-/* Get device's handler per its address under its parent */
-struct acpi_find_child {
-	acpi_handle handle;
-	acpi_integer address;
-};
+	if (check_children && list_empty(&adev->children))
+		return -ENODEV;
 
-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 = context;
-
-	status = acpi_get_object_info(handle, &buffer);
-	if (ACPI_SUCCESS(status)) {
-		info = buffer.pointer;
-		if (info->address == find->address)
-			find->handle = handle;
-		kfree(buffer.pointer);
-	}
-	return AE_OK;
+	return sta_present ? FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE;
 }
 
-acpi_handle acpi_get_child(acpi_handle parent, acpi_integer address)
+struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
+					   u64 address, bool check_children)
 {
-	struct acpi_find_child find = { NULL, address };
+	struct acpi_device *adev, *ret = NULL;
+	int ret_score = 0;
 
 	if (!parent)
 		return NULL;
-	acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
-			    1, do_acpi_find_child, &find, NULL);
-	return find.handle;
-}
 
-EXPORT_SYMBOL(acpi_get_child);
+	list_for_each_entry(adev, &parent->children, node) {
+		unsigned long long addr;
+		acpi_status status;
+		int score;
 
-/* Link ACPI devices with physical devices */
-static void acpi_glue_data_handler(acpi_handle handle,
-				   u32 function, void *context)
-{
-	/* we provide an empty handler */
+		status = acpi_evaluate_integer(adev->handle, METHOD_NAME__ADR,
+					       NULL, &addr);
+		if (ACPI_FAILURE(status) || addr != address)
+			continue;
+
+		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;
+		}
+	}
+	return ret;
 }
+EXPORT_SYMBOL_GPL(acpi_find_child_device);
 
-/* Note: a success call will increase reference count by one */
-struct device *acpi_get_physical_device(acpi_handle handle)
+static void acpi_physnode_link_name(char *buf, unsigned int node_id)
 {
-	acpi_status status;
-	struct device *dev;
-
-	status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
-	if (ACPI_SUCCESS(status))
-		return get_device(dev);
-	return NULL;
+	if (node_id > 0)
+		snprintf(buf, PHYSICAL_NODE_NAME_SIZE,
+			 PHYSICAL_NODE_STRING "%u", node_id);
+	else
+		strcpy(buf, PHYSICAL_NODE_STRING);
 }
 
-EXPORT_SYMBOL(acpi_get_physical_device);
-
-static int acpi_bind_one(struct device *dev, acpi_handle handle)
+int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
 {
-	acpi_status status;
-
-	if (dev->archdata.acpi_handle) {
-		printk(KERN_WARNING PREFIX
-		       "Drivers changed 'acpi_handle' for %s\n", dev->bus_id);
-		return -EINVAL;
+	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);
+		}
 	}
-	get_device(dev);
-	status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
-	if (ACPI_FAILURE(status)) {
-		put_device(dev);
+	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;
 	}
-	dev->archdata.acpi_handle = handle;
+
+	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++;
+		}
+	}
+
+	physical_node->node_id = node_id;
+	physical_node->dev = dev;
+	list_add(&physical_node->node, physnode_list);
+	acpi_dev->physical_node_count++;
+
+	if (!ACPI_COMPANION(dev))
+		ACPI_COMPANION_SET(dev, acpi_dev);
+
+	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);
+
+	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);
+
+	mutex_unlock(&acpi_dev->physical_node_lock);
+
+	if (acpi_dev->wakeup.flags.valid)
+		device_set_wakeup_capable(dev, true);
 
 	return 0;
+
+ err:
+	ACPI_COMPANION_SET(dev, NULL);
+	put_device(dev);
+	put_device(&acpi_dev->dev);
+	return retval;
 }
+EXPORT_SYMBOL_GPL(acpi_bind_one);
 
-static int acpi_unbind_one(struct device *dev)
+int acpi_unbind_one(struct device *dev)
 {
-	if (!dev->archdata.acpi_handle)
+	struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
+	struct acpi_device_physical_node *entry;
+
+	if (!acpi_dev)
 		return 0;
-	if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) {
-		/* acpi_get_physical_device increase refcnt by one */
-		put_device(dev);
-		acpi_detach_data(dev->archdata.acpi_handle,
-				 acpi_glue_data_handler);
-		dev->archdata.acpi_handle = NULL;
-		/* acpi_bind_one increase refcnt by one */
-		put_device(dev);
-	} else {
-		printk(KERN_ERR PREFIX
-		       "Oops, 'acpi_handle' corrupt for %s\n", dev->bus_id);
-	}
+
+	mutex_lock(&acpi_dev->physical_node_lock);
+
+	list_for_each_entry(entry, &acpi_dev->physical_node_list, node)
+		if (entry->dev == dev) {
+			char physnode_name[PHYSICAL_NODE_NAME_SIZE];
+
+			list_del(&entry->node);
+			acpi_dev->physical_node_count--;
+
+			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;
+		}
+
+	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->archdata.acpi_handle,
-			      ACPI_FULL_PATHNAME, &buffer);
-		DBG("Device %s -> %s\n", dev->bus_id, (char *)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;
@@ -219,14 +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;
@@ -235,109 +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);
-
-
-#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
-
-#ifdef CONFIG_PM
-static u32 rtc_handler(void *context)
-{
-	acpi_clear_event(ACPI_EVENT_RTC);
-	acpi_disable_event(ACPI_EVENT_RTC, 0);
-	return ACPI_INTERRUPT_HANDLED;
-}
-
-static inline void rtc_wake_setup(void)
-{
-	acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
-}
-
-static void rtc_wake_on(struct device *dev)
-{
-	acpi_clear_event(ACPI_EVENT_RTC);
-	acpi_enable_event(ACPI_EVENT_RTC, 0);
-}
-
-static void rtc_wake_off(struct device *dev)
-{
-	acpi_disable_event(ACPI_EVENT_RTC, 0);
-}
-#else
-#define rtc_wake_setup()	do{}while(0)
-#define rtc_wake_on		NULL
-#define rtc_wake_off		NULL
-#endif
-
-/* Every ACPI platform has a mc146818 compatible "cmos rtc".  Here we find
- * its device node and pass extra config data.  This helps its driver use
- * capabilities that the now-obsolete mc146818 didn't have, and informs it
- * that this board's RTC is wakeup-capable (per ACPI spec).
- */
-#include <linux/mc146818rtc.h>
-
-static struct cmos_rtc_board_info rtc_info;
-
-
-/* PNP devices are registered in a subsys_initcall();
- * ACPI specifies the PNP IDs to use.
- */
-#include <linux/pnp.h>
-
-static int __init pnp_match(struct device *dev, void *data)
-{
-	static const char *ids[] = { "PNP0b00", "PNP0b01", "PNP0b02", };
-	struct pnp_dev *pnp = to_pnp_dev(dev);
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(ids); i++) {
-		if (compare_pnp_id(pnp->id, ids[i]) != 0)
-			return 1;
-	}
-	return 0;
-}
-
-static struct device *__init get_rtc_dev(void)
-{
-	return bus_find_device(&pnp_bus_type, NULL, NULL, pnp_match);
-}
-
-static int __init acpi_rtc_init(void)
-{
-	struct device *dev = get_rtc_dev();
-
-	if (dev) {
-		rtc_wake_setup();
-		rtc_info.wake_on = rtc_wake_on;
-		rtc_info.wake_off = rtc_wake_off;
-
-		/* workaround bug in some ACPI tables */
-		if (acpi_gbl_FADT.month_alarm && !acpi_gbl_FADT.day_alarm) {
-			DBG("bogus FADT month_alarm\n");
-			acpi_gbl_FADT.month_alarm = 0;
-		}
-
-		rtc_info.rtc_day_alarm = acpi_gbl_FADT.day_alarm;
-		rtc_info.rtc_mon_alarm = acpi_gbl_FADT.month_alarm;
-		rtc_info.rtc_century = acpi_gbl_FADT.century;
-
-		/* NOTE:  S4_RTC_WAKE is NOT currently useful to Linux */
-		if (acpi_gbl_FADT.flags & ACPI_FADT_S4_RTC_WAKE)
-			printk(PREFIX "RTC can wake from S4\n");
-
-
-		dev->platform_data = &rtc_info;
-
-		/* RTC always wakes from S1/S2/S3, and often S4/STD */
-		device_init_wakeup(dev, 1);
-
-		put_device(dev);
-	} else
-		DBG("RTC unavailable?\n");
-	return 0;
-}
-/* do this between RTC subsys_initcall() and rtc_cmos driver_initcall() */
-fs_initcall(acpi_rtc_init);
-
-#endif