drivers/acpi/glue.c - kernel/msm-4.9 - Gitiles

 /*
  * 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);
	/*
	* 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);