drivers/acpi/glue.c - kernel/msm - 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...)
 #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;
 }

 EXPORT_SYMBOL(register_acpi_bus_type);

 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;
 }

 EXPORT_SYMBOL(unregister_acpi_bus_type);

 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 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;
 };

 static acpi_status
 do_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
 {
 	unsigned long *busnr = (unsigned long *)data;
 	struct acpi_resource_address64 address;

 	if (resource->id != ACPI_RSTYPE_ADDRESS16 &&
 	    resource->id != ACPI_RSTYPE_ADDRESS32 &&
 	    resource->id != ACPI_RSTYPE_ADDRESS64)
 		return AE_OK;

 	acpi_resource_to_address64(resource, &address);
 	if ((address.address_length > 0) &&
 	    (address.resource_type == ACPI_BUS_NUMBER_RANGE))
 		*busnr = address.min_address_range;

 	return AE_OK;
 }

 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;
 	}
       exit:
 	acpi_os_free(buffer.pointer);
 	return (int)bbn;
 }

 static acpi_status
 find_pci_rootbridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
 	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);

 	status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, &seg);
 	if (status == AE_NOT_FOUND) {
 		/* Assume seg = 0 */
 		status = AE_OK;
 		seg = 0;
 	}
 	if (ACPI_FAILURE(status)) {
 		status = AE_CTRL_DEPTH;
 		goto exit;
 	}

 	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;
 	}
 	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 };

 	acpi_get_devices(PCI_ROOT_HID_STRING, find_pci_rootbridge, &find, NULL);
 	return find.handle;
 }

 /* 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 = (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;
 }

 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);

 static int acpi_bind_one(struct device *dev, acpi_handle handle)
 {
 	acpi_status status;

 	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;

 	return 0;
 }

 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);
 	}
 	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->firmware_data, ACPI_FULL_PATHNAME, &buffer);
 		DBG("Device %s -> %s\n", dev->bus_id, (char *)buffer.pointer);
 		acpi_os_free(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...)
	#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;
	}

	EXPORT_SYMBOL(register_acpi_bus_type);

	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;
	}

	EXPORT_SYMBOL(unregister_acpi_bus_type);

	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 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;
	};

	static acpi_status
	do_root_bridge_busnr_callback(struct acpi_resource resource, void data)
	{
	unsigned long busnr = (unsigned long )data;
	struct acpi_resource_address64 address;

	if (resource->id != ACPI_RSTYPE_ADDRESS16 &&
	resource->id != ACPI_RSTYPE_ADDRESS32 &&
	resource->id != ACPI_RSTYPE_ADDRESS64)
	return AE_OK;

	acpi_resource_to_address64(resource, &address);
	if ((address.address_length > 0) &&
	(address.resource_type == ACPI_BUS_NUMBER_RANGE))
	*busnr = address.min_address_range;

	return AE_OK;
	}

	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;
	}
	exit:
	acpi_os_free(buffer.pointer);
	return (int)bbn;
	}

	static acpi_status
	find_pci_rootbridge(acpi_handle handle, u32 lvl, void context, void *rv)
	{
	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);

	status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, &seg);
	if (status == AE_NOT_FOUND) {
	/* Assume seg = 0 */
	status = AE_OK;
	seg = 0;
	}
	if (ACPI_FAILURE(status)) {
	status = AE_CTRL_DEPTH;
	goto exit;
	}

	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;
	}
	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 };

	acpi_get_devices(PCI_ROOT_HID_STRING, find_pci_rootbridge, &find, NULL);
	return find.handle;
	}

	/* 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 = (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;
	}

	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);

	static int acpi_bind_one(struct device *dev, acpi_handle handle)
	{
	acpi_status status;

	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;

	return 0;
	}

	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);
	}
	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->firmware_data, ACPI_FULL_PATHNAME, &buffer);
	DBG("Device %s -> %s\n", dev->bus_id, (char *)buffer.pointer);
	acpi_os_free(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);