[linux-2.6-block.git] / drivers / acpi / pci_bind.c

/*
 *  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 = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
	if (!pathname)
		return -ENOMEM;
	buffer.length = ACPI_PATHNAME_MAX;
	buffer.pointer = pathname;

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

	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 = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
	if (!pathname)
		return -ENOMEM;

	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 = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
	if (!pathname)
		return -ENOMEM;

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

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

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

	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;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* pci_bind.c - ACPI PCI Device Binding ($Revision: 2 $)
	3	*
	4	* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
	5	* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
	6	*
	7	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or (at
	12	* your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write to the Free Software Foundation, Inc.,
	21	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	22	*
	23	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	24	*/
	25
	26	#include <linux/kernel.h>
	27	#include <linux/module.h>
	28	#include <linux/init.h>
	29	#include <linux/types.h>
	30	#include <linux/proc_fs.h>
	31	#include <linux/spinlock.h>
	32	#include <linux/pm.h>
	33	#include <linux/pci.h>
	34	#include <linux/acpi.h>
	35	#include <acpi/acpi_bus.h>
	36	#include <acpi/acpi_drivers.h>
	37
1da177e4	38	#define _COMPONENT ACPI_PCI_COMPONENT
f52fd66d	39	ACPI_MODULE_NAME("pci_bind");
1da177e4 LT	40
1da177e4 LT	41	struct acpi_pci_data {
4be44fcd LB	42	struct acpi_pci_id id;
	43	struct pci_bus *bus;
	44	struct pci_dev *dev;
1da177e4 LT	45	};
1da177e4 LT	46
8713cbef AB	47	static void acpi_pci_data_handler(acpi_handle handle, u32 function,
8713cbef AB	48	void *context)
1da177e4	49	{
1da177e4 LT	50
	51	/* TBD: Anything we need to do here? */
	52
d550d98d	53	return;
1da177e4 LT	54	}
1da177e4 LT	55
1da177e4	56	/**
4ce448e5	57	* acpi_get_pci_id
1da177e4 LT	58	* ------------------
	59	* This function is used by the ACPI Interpreter (a.k.a. Core Subsystem)
	60	* to resolve PCI information for ACPI-PCI devices defined in the namespace.
	61	* This typically occurs when resolving PCI operation region information.
	62	*/
4be44fcd	63	acpi_status acpi_get_pci_id(acpi_handle handle, struct acpi_pci_id *id)
1da177e4	64	{
4be44fcd LB	65	int result = 0;
	66	acpi_status status = AE_OK;
	67	struct acpi_device *device = NULL;
	68	struct acpi_pci_data *data = NULL;
1da177e4	69
1da177e4 LT	70
1da177e4 LT	71	if (!id)
d550d98d	72	return AE_BAD_PARAMETER;
1da177e4 LT	73
	74	result = acpi_bus_get_device(handle, &device);
	75	if (result) {
6468463a LB	76	printk(KERN_ERR PREFIX
	77	"Invalid ACPI Bus context for device %s\n",
	78	acpi_device_bid(device));
d550d98d	79	return AE_NOT_EXIST;
1da177e4 LT	80	}
1da177e4 LT	81
4be44fcd	82	status = acpi_get_data(handle, acpi_pci_data_handler, (void **)&data);
4ce448e5	83	if (ACPI_FAILURE(status) \|\| !data) {
a6fc6720 TR	84	ACPI_EXCEPTION((AE_INFO, status,
	85	"Invalid ACPI-PCI context for device %s",
	86	acpi_device_bid(device)));
d550d98d	87	return status;
1da177e4 LT	88	}
	89
	90	*id = data->id;
4be44fcd	91
1da177e4	92	/*
4be44fcd LB	93	id->segment = data->id.segment;
	94	id->bus = data->id.bus;
	95	id->device = data->id.device;
	96	id->function = data->id.function;
	97	*/
1da177e4	98
4be44fcd LB	99	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	100	"Device %s has PCI address %02x:%02x:%02x.%02x\n",
	101	acpi_device_bid(device), id->segment, id->bus,
	102	id->device, id->function));
1da177e4	103
d550d98d	104	return AE_OK;
1da177e4	105	}
4be44fcd	106
4ce448e5	107	EXPORT_SYMBOL(acpi_get_pci_id);
1da177e4	108
4be44fcd	109	int acpi_pci_bind(struct acpi_device *device)
1da177e4	110	{
4be44fcd LB	111	int result = 0;
	112	acpi_status status = AE_OK;
	113	struct acpi_pci_data *data = NULL;
	114	struct acpi_pci_data *pdata = NULL;
	115	char *pathname = NULL;
	116	struct acpi_buffer buffer = { 0, NULL };
	117	acpi_handle handle = NULL;
	118	struct pci_dev *dev;
	119	struct pci_bus *bus;
1da177e4	120
1da177e4 LT	121
1da177e4 LT	122	if (!device \|\| !device->parent)
d550d98d	123	return -EINVAL;
1da177e4	124
36bcbec7	125	pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
4be44fcd	126	if (!pathname)
d550d98d	127	return -ENOMEM;
1da177e4 LT	128	buffer.length = ACPI_PATHNAME_MAX;
	129	buffer.pointer = pathname;
	130
36bcbec7	131	data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
4be44fcd LB	132	if (!data) {
4be44fcd LB	133	kfree(pathname);
d550d98d	134	return -ENOMEM;
1da177e4	135	}
1da177e4 LT	136
1da177e4 LT	137	acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
4be44fcd LB	138	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI device [%s]...\n",
4be44fcd LB	139	pathname));
1da177e4 LT	140
	141	/*
	142	* Segment & Bus
	143	* -------------
	144	* These are obtained via the parent device's ACPI-PCI context.
	145	*/
4be44fcd LB	146	status = acpi_get_data(device->parent->handle, acpi_pci_data_handler,
4be44fcd LB	147	(void **)&pdata);
1da177e4	148	if (ACPI_FAILURE(status) \|\| !pdata \|\| !pdata->bus) {
a6fc6720 TR	149	ACPI_EXCEPTION((AE_INFO, status,
	150	"Invalid ACPI-PCI context for parent device %s",
	151	acpi_device_bid(device->parent)));
1da177e4 LT	152	result = -ENODEV;
	153	goto end;
	154	}
	155	data->id.segment = pdata->id.segment;
	156	data->id.bus = pdata->bus->number;
	157
	158	/*
	159	* Device & Function
	160	* -----------------
	161	* These are simply obtained from the device's _ADR method. Note
	162	* that a value of zero is valid.
	163	*/
	164	data->id.device = device->pnp.bus_address >> 16;
	165	data->id.function = device->pnp.bus_address & 0xFFFF;
	166
	167	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "...to %02x:%02x:%02x.%02x\n",
4be44fcd LB	168	data->id.segment, data->id.bus, data->id.device,
4be44fcd LB	169	data->id.function));
1da177e4 LT	170
	171	/*
	172	* TBD: Support slot devices (e.g. function=0xFFFF).
	173	*/
	174
	175	/*
	176	* Locate PCI Device
	177	* -----------------
	178	* Locate matching device in PCI namespace. If it doesn't exist
	179	* this typically means that the device isn't currently inserted
	180	* (e.g. docking station, port replicator, etc.).
c431ada4 RS	181	* We cannot simply search the global pci device list, since
	182	* PCI devices are added to the global pci list when the root
	183	* bridge start ops are run, which may not have happened yet.
1da177e4	184	*/
c431ada4 RS	185	bus = pci_find_bus(data->id.segment, data->id.bus);
	186	if (bus) {
	187	list_for_each_entry(dev, &bus->devices, bus_list) {
	188	if (dev->devfn == PCI_DEVFN(data->id.device,
4be44fcd	189	data->id.function)) {
c431ada4 RS	190	data->dev = dev;
	191	break;
	192	}
	193	}
	194	}
1da177e4	195	if (!data->dev) {
4be44fcd LB	196	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	197	"Device %02x:%02x:%02x.%02x not present in PCI namespace\n",
	198	data->id.segment, data->id.bus,
	199	data->id.device, data->id.function));
1da177e4 LT	200	result = -ENODEV;
	201	goto end;
	202	}
	203	if (!data->dev->bus) {
6468463a LB	204	printk(KERN_ERR PREFIX
6468463a LB	205	"Device %02x:%02x:%02x.%02x has invalid 'bus' field\n",
a6fc6720	206	data->id.segment, data->id.bus,
6468463a	207	data->id.device, data->id.function);
1da177e4 LT	208	result = -ENODEV;
	209	goto end;
	210	}
	211
	212	/*
	213	* PCI Bridge?
	214	* -----------
	215	* If so, set the 'bus' field and install the 'bind' function to
	216	* facilitate callbacks for all of its children.
	217	*/
	218	if (data->dev->subordinate) {
4be44fcd LB	219	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	220	"Device %02x:%02x:%02x.%02x is a PCI bridge\n",
	221	data->id.segment, data->id.bus,
	222	data->id.device, data->id.function));
1da177e4 LT	223	data->bus = data->dev->subordinate;
	224	device->ops.bind = acpi_pci_bind;
	225	device->ops.unbind = acpi_pci_unbind;
	226	}
	227
	228	/*
	229	* Attach ACPI-PCI Context
	230	* -----------------------
	231	* Thus binding the ACPI and PCI devices.
	232	*/
	233	status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
	234	if (ACPI_FAILURE(status)) {
a6fc6720 TR	235	ACPI_EXCEPTION((AE_INFO, status,
	236	"Unable to attach ACPI-PCI context to device %s",
	237	acpi_device_bid(device)));
1da177e4 LT	238	result = -ENODEV;
	239	goto end;
	240	}
	241
	242	/*
	243	* PCI Routing Table
	244	* -----------------
	245	* Evaluate and parse _PRT, if exists. This code is independent of
	246	* PCI bridges (above) to allow parsing of _PRT objects within the
	247	* scope of non-bridge devices. Note that _PRTs within the scope of
	248	* a PCI bridge assume the bridge's subordinate bus number.
	249	*
	250	* TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
	251	*/
	252	status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
	253	if (ACPI_SUCCESS(status)) {
4be44fcd	254	if (data->bus) /* PCI-PCI bridge */
1da177e4	255	acpi_pci_irq_add_prt(device->handle, data->id.segment,
4be44fcd LB	256	data->bus->number);
	257	else /* non-bridge PCI device */
	258	acpi_pci_irq_add_prt(device->handle, data->id.segment,
	259	data->id.bus);
1da177e4 LT	260	}
1da177e4 LT	261
4be44fcd	262	end:
1da177e4 LT	263	kfree(pathname);
	264	if (result)
	265	kfree(data);
	266
d550d98d	267	return result;
1da177e4 LT	268	}
1da177e4 LT	269
4be44fcd	270	int acpi_pci_unbind(struct acpi_device *device)
1da177e4	271	{
4be44fcd LB	272	int result = 0;
	273	acpi_status status = AE_OK;
	274	struct acpi_pci_data *data = NULL;
	275	char *pathname = NULL;
	276	struct acpi_buffer buffer = { 0, NULL };
1da177e4	277
1da177e4 LT	278
1da177e4 LT	279	if (!device \|\| !device->parent)
d550d98d	280	return -EINVAL;
1da177e4	281
36bcbec7	282	pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
4be44fcd	283	if (!pathname)
d550d98d	284	return -ENOMEM;
1da177e4 LT	285
	286	buffer.length = ACPI_PATHNAME_MAX;
	287	buffer.pointer = pathname;
	288	acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
	289	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unbinding PCI device [%s]...\n",
4be44fcd	290	pathname));
1da177e4 LT	291	kfree(pathname);
1da177e4 LT	292
4be44fcd LB	293	status =
	294	acpi_get_data(device->handle, acpi_pci_data_handler,
	295	(void **)&data);
1da177e4	296	if (ACPI_FAILURE(status)) {
a6fc6720 TR	297	ACPI_EXCEPTION((AE_INFO, status,
	298	"Unable to get data from device %s",
	299	acpi_device_bid(device)));
1da177e4 LT	300	result = -ENODEV;
	301	goto end;
	302	}
	303
	304	status = acpi_detach_data(device->handle, acpi_pci_data_handler);
	305	if (ACPI_FAILURE(status)) {
a6fc6720 TR	306	ACPI_EXCEPTION((AE_INFO, status,
	307	"Unable to detach data from device %s",
	308	acpi_device_bid(device)));
1da177e4 LT	309	result = -ENODEV;
	310	goto end;
	311	}
	312	if (data->dev->subordinate) {
	313	acpi_pci_irq_del_prt(data->id.segment, data->bus->number);
	314	}
	315	kfree(data);
	316
4be44fcd	317	end:
d550d98d	318	return result;
1da177e4 LT	319	}
1da177e4 LT	320
4be44fcd LB	321	int
	322	acpi_pci_bind_root(struct acpi_device *device,
	323	struct acpi_pci_id id, struct pci_bus bus)
1da177e4	324	{
4be44fcd LB	325	int result = 0;
	326	acpi_status status = AE_OK;
	327	struct acpi_pci_data *data = NULL;
	328	char *pathname = NULL;
	329	struct acpi_buffer buffer = { 0, NULL };
1da177e4	330
36bcbec7	331	pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
4be44fcd	332	if (!pathname)
d550d98d	333	return -ENOMEM;
1da177e4 LT	334
	335	buffer.length = ACPI_PATHNAME_MAX;
	336	buffer.pointer = pathname;
	337
4be44fcd	338	if (!device \|\| !id \|\| !bus) {
1da177e4	339	kfree(pathname);
d550d98d	340	return -EINVAL;
1da177e4 LT	341	}
1da177e4 LT	342
36bcbec7	343	data = kzalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
4be44fcd	344	if (!data) {
1da177e4	345	kfree(pathname);
d550d98d	346	return -ENOMEM;
1da177e4	347	}
1da177e4 LT	348
	349	data->id = *id;
	350	data->bus = bus;
	351	device->ops.bind = acpi_pci_bind;
	352	device->ops.unbind = acpi_pci_unbind;
	353
	354	acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
	355
	356	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI root bridge [%s] to "
4be44fcd	357	"%02x:%02x\n", pathname, id->segment, id->bus));
1da177e4 LT	358
	359	status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
	360	if (ACPI_FAILURE(status)) {
a6fc6720 TR	361	ACPI_EXCEPTION((AE_INFO, status,
	362	"Unable to attach ACPI-PCI context to device %s",
	363	pathname));
1da177e4 LT	364	result = -ENODEV;
	365	goto end;
	366	}
	367
4be44fcd	368	end:
1da177e4 LT	369	kfree(pathname);
	370	if (result != 0)
	371	kfree(data);
	372
d550d98d	373	return result;
1da177e4	374	}