1 files changed, 302 insertions, 0 deletions
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
new file mode 100644
index 0000000..adec3d1
--- /dev/null
+++ b/drivers/acpi/glue.c
@@ -0,0 +1,302 @@
+/*
+ * Link physical devices with ACPI devices support
+ *
+ * Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
+ * Copyright (c) 2005 Intel Corp.
+ *
+ * This file is released under the GPLv2.
+ */
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/device.h>
+#include <linux/rwsem.h>
+#include <linux/acpi.h>
+
+#define ACPI_GLUE_DEBUG	0
+#if ACPI_GLUE_DEBUG
+#define DBG(x...) printk(PREFIX x)
+#else
+#define DBG(x...) do { } while(0)
+#endif
+static LIST_HEAD(bus_type_list);
+static DECLARE_RWSEM(bus_type_sem);
+
+int register_acpi_bus_type(struct acpi_bus_type *type)
+{
+	if (acpi_disabled)
+		return -ENODEV;
+	if (type && type->bus && type->find_device) {
+		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);
+		return 0;
+	}
+	return -ENODEV;
+}
+
+int unregister_acpi_bus_type(struct acpi_bus_type *type)
+{
+	if (acpi_disabled)
+		return 0;
+	if (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);
+		return 0;
+	}
+	return -ENODEV;
+}
+
+static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
+{
+	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) {
+			ret = tmp;
+			break;
+		}
+	}
+	up_read(&bus_type_sem);
+	return ret;
+}
+
+static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
+{
+	struct acpi_bus_type *tmp;
+	int ret = -ENODEV;
+
+	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;
+}
+
+/* Get device's handler per its address under its parent */
+struct acpi_find_child {
+	acpi_handle handle;
+	acpi_integer address;
+};
+
+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;
+}
+
+acpi_handle acpi_get_child(acpi_handle parent, acpi_integer address)
+{
+	struct acpi_find_child find = { NULL, address };
+
+	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);
+
+/* Link ACPI devices with physical devices */
+static void acpi_glue_data_handler(acpi_handle handle,
+				   u32 function, void *context)
+{
+	/* we provide an empty handler */
+}
+
+/* Note: a success call will increase reference count by one */
+struct device *acpi_get_physical_device(acpi_handle handle)
+{
+	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;
+}
+
+EXPORT_SYMBOL(acpi_get_physical_device);
+
+/* ToDo: When a PCI bridge is found, return the PCI device behind the bridge
+ *       This should work in general, but did not on a Lenovo T61 for the
+ *	 graphics card. But this must be fixed when the PCI device is
+ *       bound and the kernel device struct is attached to the acpi device
+ * Note: A success call will increase reference count by one
+ *       Do call put_device(dev) on the returned device then
+ */
+struct device *acpi_get_physical_pci_device(acpi_handle handle)
+{
+	struct device *dev;
+	long long device_id;
+	acpi_status status;
+
+	status =
+		acpi_evaluate_integer(handle, "_ADR", NULL, &device_id);
+
+	if (ACPI_FAILURE(status))
+		return NULL;
+
+	/* We need to attempt to determine whether the _ADR refers to a
+	   PCI device or not. There's no terribly good way to do this,
+	   so the best we can hope for is to assume that there'll never
+	   be a device in the host bridge */
+	if (device_id >= 0x10000) {
+		/* It looks like a PCI device. Does it exist? */
+		dev = acpi_get_physical_device(handle);
+	} else {
+		/* It doesn't look like a PCI device. Does its parent
+		   exist? */
+		acpi_handle phandle;
+		if (acpi_get_parent(handle, &phandle))
+			return NULL;
+		dev = acpi_get_physical_device(phandle);
+	}
+	if (!dev)
+		return NULL;
+	return dev;
+}
+EXPORT_SYMBOL(acpi_get_physical_pci_device);
+
+static int acpi_bind_one(struct device *dev, acpi_handle handle)
+{
+	struct acpi_device *acpi_dev;
+	acpi_status status;
+
+	if (dev->archdata.acpi_handle) {
+		dev_warn(dev, "Drivers changed 'acpi_handle'\n");
+		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->archdata.acpi_handle = handle;
+
+	status = acpi_bus_get_device(handle, &acpi_dev);
+	if (!ACPI_FAILURE(status)) {
+		int ret;
+
+		ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
+				"firmware_node");
+		ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
+				"physical_node");
+		if (acpi_dev->wakeup.flags.valid) {
+			device_set_wakeup_capable(dev, true);
+			device_set_wakeup_enable(dev,
+						acpi_dev->wakeup.state.enabled);
+		}
+	}
+
+	return 0;
+}
+
+static int acpi_unbind_one(struct device *dev)
+{
+	if (!dev->archdata.acpi_handle)
+		return 0;
+	if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) {
+		struct acpi_device *acpi_dev;
+
+		/* acpi_get_physical_device increase refcnt by one */
+		put_device(dev);
+
+		if (!acpi_bus_get_device(dev->archdata.acpi_handle,
+					&acpi_dev)) {
+			sysfs_remove_link(&dev->kobj, "firmware_node");
+			sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node");
+		}
+
+		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 {
+		dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
+	}
+	return 0;
+}
+
+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;
+	}
+	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);
+
+#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);
+		kfree(buffer.pointer);
+	} else
+		DBG("Device %s -> No ACPI support\n", dev->bus_id);
+#endif
+
+	return ret;
+}
+
+static int acpi_platform_notify_remove(struct device *dev)
+{
+	acpi_unbind_one(dev);
+	return 0;
+}
+
+static 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;
+	}
+	platform_notify = acpi_platform_notify;
+	platform_notify_remove = acpi_platform_notify_remove;
+	return 0;
+}
+
+arch_initcall(init_acpi_device_notify);