drivers/acpi/pci_bind.c - linux-mtk - Git at Google

 /*
  *  pci_bind.c - ACPI PCI Device Binding ($Revision: 2 $)
  *
  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or (at
  *  your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful, but
  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  *  General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License along
  *  with this program; if not, write to the Free Software Foundation, Inc.,
  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/proc_fs.h>
 #include <linux/spinlock.h>
 #include <linux/pm.h>
 #include <linux/pci.h>
 #include <linux/acpi.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>

 #define _COMPONENT		ACPI_PCI_COMPONENT
 ACPI_MODULE_NAME("pci_bind")

 struct acpi_pci_data {
 	struct acpi_pci_id id;
 	struct pci_bus *bus;
 	struct pci_dev *dev;
 };

 static void acpi_pci_data_handler(acpi_handle handle, u32 function,
 				  void *context)
 {

 	/* TBD: Anything we need to do here? */

 	return;
 }

 /**
  * acpi_get_pci_id
  * ------------------
  * This function is used by the ACPI Interpreter (a.k.a. Core Subsystem)
  * to resolve PCI information for ACPI-PCI devices defined in the namespace.
  * This typically occurs when resolving PCI operation region information.
  */
 acpi_status acpi_get_pci_id(acpi_handle handle, struct acpi_pci_id *id)
 {
 	int result = 0;
 	acpi_status status = AE_OK;
 	struct acpi_device *device = NULL;
 	struct acpi_pci_data *data = NULL;


 	if (!id)
 		return AE_BAD_PARAMETER;

 	result = acpi_bus_get_device(handle, &device);
 	if (result) {
 		printk(KERN_ERR PREFIX
 			    "Invalid ACPI Bus context for device %s\n",
 			    acpi_device_bid(device));
 		return AE_NOT_EXIST;
 	}

 	status = acpi_get_data(handle, acpi_pci_data_handler, (void **)&data);
 	if (ACPI_FAILURE(status) || !data) {
 		ACPI_EXCEPTION((AE_INFO, status,
 				"Invalid ACPI-PCI context for device %s",
 				acpi_device_bid(device)));
 		return status;
 	}

 	*id = data->id;

 	/*
 	   id->segment = data->id.segment;
 	   id->bus = data->id.bus;
 	   id->device = data->id.device;
 	   id->function = data->id.function;
 	 */

 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 			  "Device %s has PCI address %02x:%02x:%02x.%02x\n",
 			  acpi_device_bid(device), id->segment, id->bus,
 			  id->device, id->function));

 	return AE_OK;
 }

 EXPORT_SYMBOL(acpi_get_pci_id);

 int acpi_pci_bind(struct acpi_device *device)
 {
 	int result = 0;
 	acpi_status status = AE_OK;
 	struct acpi_pci_data *data = NULL;
 	struct acpi_pci_data *pdata = NULL;
 	char *pathname = NULL;
 	struct acpi_buffer buffer = { 0, NULL };
 	acpi_handle handle = NULL;
 	struct pci_dev *dev;
 	struct pci_bus *bus;


 	if (!device || !device->parent)
 		return -EINVAL;

 	pathname = kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
 	if (!pathname)
 		return -ENOMEM;
 	memset(pathname, 0, ACPI_PATHNAME_MAX);
 	buffer.length = ACPI_PATHNAME_MAX;
 	buffer.pointer = pathname;

 	data = kmalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
 	if (!data) {
 		kfree(pathname);
 		return -ENOMEM;
 	}
 	memset(data, 0, sizeof(struct acpi_pci_data));

 	acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI device [%s]...\n",
 			  pathname));

 	/*
 	 * Segment & Bus
 	 * -------------
 	 * These are obtained via the parent device's ACPI-PCI context.
 	 */
 	status = acpi_get_data(device->parent->handle, acpi_pci_data_handler,
 			       (void **)&pdata);
 	if (ACPI_FAILURE(status) || !pdata || !pdata->bus) {
 		ACPI_EXCEPTION((AE_INFO, status,
 				"Invalid ACPI-PCI context for parent device %s",
 				acpi_device_bid(device->parent)));
 		result = -ENODEV;
 		goto end;
 	}
 	data->id.segment = pdata->id.segment;
 	data->id.bus = pdata->bus->number;

 	/*
 	 * Device & Function
 	 * -----------------
 	 * These are simply obtained from the device's _ADR method.  Note
 	 * that a value of zero is valid.
 	 */
 	data->id.device = device->pnp.bus_address >> 16;
 	data->id.function = device->pnp.bus_address & 0xFFFF;

 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "...to %02x:%02x:%02x.%02x\n",
 			  data->id.segment, data->id.bus, data->id.device,
 			  data->id.function));

 	/*
 	 * TBD: Support slot devices (e.g. function=0xFFFF).
 	 */

 	/*
 	 * Locate PCI Device
 	 * -----------------
 	 * Locate matching device in PCI namespace.  If it doesn't exist
 	 * this typically means that the device isn't currently inserted
 	 * (e.g. docking station, port replicator, etc.).
 	 * We cannot simply search the global pci device list, since
 	 * PCI devices are added to the global pci list when the root
 	 * bridge start ops are run, which may not have happened yet.
 	 */
 	bus = pci_find_bus(data->id.segment, data->id.bus);
 	if (bus) {
 		list_for_each_entry(dev, &bus->devices, bus_list) {
 			if (dev->devfn == PCI_DEVFN(data->id.device,
 						    data->id.function)) {
 				data->dev = dev;
 				break;
 			}
 		}
 	}
 	if (!data->dev) {
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 				  "Device %02x:%02x:%02x.%02x not present in PCI namespace\n",
 				  data->id.segment, data->id.bus,
 				  data->id.device, data->id.function));
 		result = -ENODEV;
 		goto end;
 	}
 	if (!data->dev->bus) {
 		printk(KERN_ERR PREFIX
 			    "Device %02x:%02x:%02x.%02x has invalid 'bus' field\n",
 			    data->id.segment, data->id.bus,
 			    data->id.device, data->id.function);
 		result = -ENODEV;
 		goto end;
 	}

 	/*
 	 * PCI Bridge?
 	 * -----------
 	 * If so, set the 'bus' field and install the 'bind' function to
 	 * facilitate callbacks for all of its children.
 	 */
 	if (data->dev->subordinate) {
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 				  "Device %02x:%02x:%02x.%02x is a PCI bridge\n",
 				  data->id.segment, data->id.bus,
 				  data->id.device, data->id.function));
 		data->bus = data->dev->subordinate;
 		device->ops.bind = acpi_pci_bind;
 		device->ops.unbind = acpi_pci_unbind;
 	}

 	/*
 	 * Attach ACPI-PCI Context
 	 * -----------------------
 	 * Thus binding the ACPI and PCI devices.
 	 */
 	status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
 	if (ACPI_FAILURE(status)) {
 		ACPI_EXCEPTION((AE_INFO, status,
 				"Unable to attach ACPI-PCI context to device %s",
 				acpi_device_bid(device)));
 		result = -ENODEV;
 		goto end;
 	}

 	/*
 	 * PCI Routing Table
 	 * -----------------
 	 * Evaluate and parse _PRT, if exists.  This code is independent of
 	 * PCI bridges (above) to allow parsing of _PRT objects within the
 	 * scope of non-bridge devices.  Note that _PRTs within the scope of
 	 * a PCI bridge assume the bridge's subordinate bus number.
 	 *
 	 * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
 	 */
 	status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
 	if (ACPI_SUCCESS(status)) {
 		if (data->bus)	/* PCI-PCI bridge */
 			acpi_pci_irq_add_prt(device->handle, data->id.segment,
 					     data->bus->number);
 		else		/* non-bridge PCI device */
 			acpi_pci_irq_add_prt(device->handle, data->id.segment,
 					     data->id.bus);
 	}

       end:
 	kfree(pathname);
 	if (result)
 		kfree(data);

 	return result;
 }

 int acpi_pci_unbind(struct acpi_device *device)
 {
 	int result = 0;
 	acpi_status status = AE_OK;
 	struct acpi_pci_data *data = NULL;
 	char *pathname = NULL;
 	struct acpi_buffer buffer = { 0, NULL };


 	if (!device || !device->parent)
 		return -EINVAL;

 	pathname = (char *)kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
 	if (!pathname)
 		return -ENOMEM;
 	memset(pathname, 0, ACPI_PATHNAME_MAX);

 	buffer.length = ACPI_PATHNAME_MAX;
 	buffer.pointer = pathname;
 	acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unbinding PCI device [%s]...\n",
 			  pathname));
 	kfree(pathname);

 	status =
 	    acpi_get_data(device->handle, acpi_pci_data_handler,
 			  (void **)&data);
 	if (ACPI_FAILURE(status)) {
 		ACPI_EXCEPTION((AE_INFO, status,
 				"Unable to get data from device %s",
 				acpi_device_bid(device)));
 		result = -ENODEV;
 		goto end;
 	}

 	status = acpi_detach_data(device->handle, acpi_pci_data_handler);
 	if (ACPI_FAILURE(status)) {
 		ACPI_EXCEPTION((AE_INFO, status,
 				"Unable to detach data from device %s",
 				acpi_device_bid(device)));
 		result = -ENODEV;
 		goto end;
 	}
 	if (data->dev->subordinate) {
 		acpi_pci_irq_del_prt(data->id.segment, data->bus->number);
 	}
 	kfree(data);

       end:
 	return result;
 }

 int
 acpi_pci_bind_root(struct acpi_device *device,
 		   struct acpi_pci_id *id, struct pci_bus *bus)
 {
 	int result = 0;
 	acpi_status status = AE_OK;
 	struct acpi_pci_data *data = NULL;
 	char *pathname = NULL;
 	struct acpi_buffer buffer = { 0, NULL };


 	pathname = (char *)kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
 	if (!pathname)
 		return -ENOMEM;
 	memset(pathname, 0, ACPI_PATHNAME_MAX);

 	buffer.length = ACPI_PATHNAME_MAX;
 	buffer.pointer = pathname;

 	if (!device || !id || !bus) {
 		kfree(pathname);
 		return -EINVAL;
 	}

 	data = kmalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
 	if (!data) {
 		kfree(pathname);
 		return -ENOMEM;
 	}
 	memset(data, 0, sizeof(struct acpi_pci_data));

 	data->id = *id;
 	data->bus = bus;
 	device->ops.bind = acpi_pci_bind;
 	device->ops.unbind = acpi_pci_unbind;

 	acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);

 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI root bridge [%s] to "
 			  "%02x:%02x\n", pathname, id->segment, id->bus));

 	status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
 	if (ACPI_FAILURE(status)) {
 		ACPI_EXCEPTION((AE_INFO, status,
 				"Unable to attach ACPI-PCI context to device %s",
 				pathname));
 		result = -ENODEV;
 		goto end;
 	}

       end:
 	kfree(pathname);
 	if (result != 0)
 		kfree(data);

 	return result;
 }
	/*
	* pci_bind.c - ACPI PCI Device Binding ($Revision: 2 $)
	*
	* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
	* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or (at
	* your option) any later version.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write to the Free Software Foundation, Inc.,
	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <linux/proc_fs.h>
	#include <linux/spinlock.h>
	#include <linux/pm.h>
	#include <linux/pci.h>
	#include <linux/acpi.h>
	#include <acpi/acpi_bus.h>
	#include <acpi/acpi_drivers.h>

	#define _COMPONENT ACPI_PCI_COMPONENT
	ACPI_MODULE_NAME("pci_bind")

	struct acpi_pci_data {
	struct acpi_pci_id id;
	struct pci_bus *bus;
	struct pci_dev *dev;
	};

	static void acpi_pci_data_handler(acpi_handle handle, u32 function,
	void *context)
	{

	/* TBD: Anything we need to do here? */

	return;
	}

	/**
	* acpi_get_pci_id
	* ------------------
	* This function is used by the ACPI Interpreter (a.k.a. Core Subsystem)
	* to resolve PCI information for ACPI-PCI devices defined in the namespace.
	* This typically occurs when resolving PCI operation region information.
	*/
	acpi_status acpi_get_pci_id(acpi_handle handle, struct acpi_pci_id *id)
	{
	int result = 0;
	acpi_status status = AE_OK;
	struct acpi_device *device = NULL;
	struct acpi_pci_data *data = NULL;


	if (!id)
	return AE_BAD_PARAMETER;

	result = acpi_bus_get_device(handle, &device);
	if (result) {
	printk(KERN_ERR PREFIX
	"Invalid ACPI Bus context for device %s\n",
	acpi_device_bid(device));
	return AE_NOT_EXIST;
	}

	status = acpi_get_data(handle, acpi_pci_data_handler, (void **)&data);
	if (ACPI_FAILURE(status) \|\| !data) {
	ACPI_EXCEPTION((AE_INFO, status,
	"Invalid ACPI-PCI context for device %s",
	acpi_device_bid(device)));
	return status;
	}

	*id = data->id;

	/*
	id->segment = data->id.segment;
	id->bus = data->id.bus;
	id->device = data->id.device;
	id->function = data->id.function;
	*/

	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	"Device %s has PCI address %02x:%02x:%02x.%02x\n",
	acpi_device_bid(device), id->segment, id->bus,
	id->device, id->function));

	return AE_OK;
	}

	EXPORT_SYMBOL(acpi_get_pci_id);

	int acpi_pci_bind(struct acpi_device *device)
	{
	int result = 0;
	acpi_status status = AE_OK;
	struct acpi_pci_data *data = NULL;
	struct acpi_pci_data *pdata = NULL;
	char *pathname = NULL;
	struct acpi_buffer buffer = { 0, NULL };
	acpi_handle handle = NULL;
	struct pci_dev *dev;
	struct pci_bus *bus;


	if (!device \|\| !device->parent)
	return -EINVAL;

	pathname = kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
	if (!pathname)
	return -ENOMEM;
	memset(pathname, 0, ACPI_PATHNAME_MAX);
	buffer.length = ACPI_PATHNAME_MAX;
	buffer.pointer = pathname;

	data = kmalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
	if (!data) {
	kfree(pathname);
	return -ENOMEM;
	}
	memset(data, 0, sizeof(struct acpi_pci_data));

	acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI device [%s]...\n",
	pathname));

	/*
	* Segment & Bus
	* -------------
	* These are obtained via the parent device's ACPI-PCI context.
	*/
	status = acpi_get_data(device->parent->handle, acpi_pci_data_handler,
	(void **)&pdata);
	if (ACPI_FAILURE(status) \|\| !pdata \|\| !pdata->bus) {
	ACPI_EXCEPTION((AE_INFO, status,
	"Invalid ACPI-PCI context for parent device %s",
	acpi_device_bid(device->parent)));
	result = -ENODEV;
	goto end;
	}
	data->id.segment = pdata->id.segment;
	data->id.bus = pdata->bus->number;

	/*
	* Device & Function
	* -----------------
	* These are simply obtained from the device's _ADR method. Note
	* that a value of zero is valid.
	*/
	data->id.device = device->pnp.bus_address >> 16;
	data->id.function = device->pnp.bus_address & 0xFFFF;

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "...to %02x:%02x:%02x.%02x\n",
	data->id.segment, data->id.bus, data->id.device,
	data->id.function));

	/*
	* TBD: Support slot devices (e.g. function=0xFFFF).
	*/

	/*
	* Locate PCI Device
	* -----------------
	* Locate matching device in PCI namespace. If it doesn't exist
	* this typically means that the device isn't currently inserted
	* (e.g. docking station, port replicator, etc.).
	* We cannot simply search the global pci device list, since
	* PCI devices are added to the global pci list when the root
	* bridge start ops are run, which may not have happened yet.
	*/
	bus = pci_find_bus(data->id.segment, data->id.bus);
	if (bus) {
	list_for_each_entry(dev, &bus->devices, bus_list) {
	if (dev->devfn == PCI_DEVFN(data->id.device,
	data->id.function)) {
	data->dev = dev;
	break;
	}
	}
	}
	if (!data->dev) {
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	"Device %02x:%02x:%02x.%02x not present in PCI namespace\n",
	data->id.segment, data->id.bus,
	data->id.device, data->id.function));
	result = -ENODEV;
	goto end;
	}
	if (!data->dev->bus) {
	printk(KERN_ERR PREFIX
	"Device %02x:%02x:%02x.%02x has invalid 'bus' field\n",
	data->id.segment, data->id.bus,
	data->id.device, data->id.function);
	result = -ENODEV;
	goto end;
	}

	/*
	* PCI Bridge?
	* -----------
	* If so, set the 'bus' field and install the 'bind' function to
	* facilitate callbacks for all of its children.
	*/
	if (data->dev->subordinate) {
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	"Device %02x:%02x:%02x.%02x is a PCI bridge\n",
	data->id.segment, data->id.bus,
	data->id.device, data->id.function));
	data->bus = data->dev->subordinate;
	device->ops.bind = acpi_pci_bind;
	device->ops.unbind = acpi_pci_unbind;
	}

	/*
	* Attach ACPI-PCI Context
	* -----------------------
	* Thus binding the ACPI and PCI devices.
	*/
	status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
	if (ACPI_FAILURE(status)) {
	ACPI_EXCEPTION((AE_INFO, status,
	"Unable to attach ACPI-PCI context to device %s",
	acpi_device_bid(device)));
	result = -ENODEV;
	goto end;
	}

	/*
	* PCI Routing Table
	* -----------------
	* Evaluate and parse _PRT, if exists. This code is independent of
	* PCI bridges (above) to allow parsing of _PRT objects within the
	* scope of non-bridge devices. Note that _PRTs within the scope of
	* a PCI bridge assume the bridge's subordinate bus number.
	*
	* TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
	*/
	status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
	if (ACPI_SUCCESS(status)) {
	if (data->bus) /* PCI-PCI bridge */
	acpi_pci_irq_add_prt(device->handle, data->id.segment,
	data->bus->number);
	else /* non-bridge PCI device */
	acpi_pci_irq_add_prt(device->handle, data->id.segment,
	data->id.bus);
	}

	end:
	kfree(pathname);
	if (result)
	kfree(data);

	return result;
	}

	int acpi_pci_unbind(struct acpi_device *device)
	{
	int result = 0;
	acpi_status status = AE_OK;
	struct acpi_pci_data *data = NULL;
	char *pathname = NULL;
	struct acpi_buffer buffer = { 0, NULL };


	if (!device \|\| !device->parent)
	return -EINVAL;

	pathname = (char *)kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
	if (!pathname)
	return -ENOMEM;
	memset(pathname, 0, ACPI_PATHNAME_MAX);

	buffer.length = ACPI_PATHNAME_MAX;
	buffer.pointer = pathname;
	acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unbinding PCI device [%s]...\n",
	pathname));
	kfree(pathname);

	status =
	acpi_get_data(device->handle, acpi_pci_data_handler,
	(void **)&data);
	if (ACPI_FAILURE(status)) {
	ACPI_EXCEPTION((AE_INFO, status,
	"Unable to get data from device %s",
	acpi_device_bid(device)));
	result = -ENODEV;
	goto end;
	}

	status = acpi_detach_data(device->handle, acpi_pci_data_handler);
	if (ACPI_FAILURE(status)) {
	ACPI_EXCEPTION((AE_INFO, status,
	"Unable to detach data from device %s",
	acpi_device_bid(device)));
	result = -ENODEV;
	goto end;
	}
	if (data->dev->subordinate) {
	acpi_pci_irq_del_prt(data->id.segment, data->bus->number);
	}
	kfree(data);

	end:
	return result;
	}

	int
	acpi_pci_bind_root(struct acpi_device *device,
	struct acpi_pci_id id, struct pci_bus bus)
	{
	int result = 0;
	acpi_status status = AE_OK;
	struct acpi_pci_data *data = NULL;
	char *pathname = NULL;
	struct acpi_buffer buffer = { 0, NULL };


	pathname = (char *)kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
	if (!pathname)
	return -ENOMEM;
	memset(pathname, 0, ACPI_PATHNAME_MAX);

	buffer.length = ACPI_PATHNAME_MAX;
	buffer.pointer = pathname;

	if (!device \|\| !id \|\| !bus) {
	kfree(pathname);
	return -EINVAL;
	}

	data = kmalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
	if (!data) {
	kfree(pathname);
	return -ENOMEM;
	}
	memset(data, 0, sizeof(struct acpi_pci_data));

	data->id = *id;
	data->bus = bus;
	device->ops.bind = acpi_pci_bind;
	device->ops.unbind = acpi_pci_unbind;

	acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI root bridge [%s] to "
	"%02x:%02x\n", pathname, id->segment, id->bus));

	status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
	if (ACPI_FAILURE(status)) {
	ACPI_EXCEPTION((AE_INFO, status,
	"Unable to attach ACPI-PCI context to device %s",
	pathname));
	result = -ENODEV;
	goto end;
	}

	end:
	kfree(pathname);
	if (result != 0)
	kfree(data);

	return result;
	}