[net-next-2.6.git] / drivers / pnp / pnpacpi / core.c

/*
 * pnpacpi -- PnP ACPI driver
 *
 * Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
 * Copyright (c) 2004 Li Shaohua <shaohua.li@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, 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/acpi.h>
#include <linux/pnp.h>
#include <linux/slab.h>
#include <linux/mod_devicetable.h>
#include <acpi/acpi_bus.h>

#include "../base.h"
#include "pnpacpi.h"

static int num = 0;

/* We need only to blacklist devices that have already an acpi driver that
 * can't use pnp layer. We don't need to blacklist device that are directly
 * used by the kernel (PCI root, ...), as it is harmless and there were
 * already present in pnpbios. But there is an exception for devices that
 * have irqs (PIC, Timer) because we call acpi_register_gsi.
 * Finally, only devices that have a CRS method need to be in this list.
 */
static struct acpi_device_id excluded_id_list[] __initdata = {
	{"PNP0C09", 0},		/* EC */
	{"PNP0C0F", 0},		/* Link device */
	{"PNP0000", 0},		/* PIC */
	{"PNP0100", 0},		/* Timer */
	{"", 0},
};

static inline int __init is_exclusive_device(struct acpi_device *dev)
{
	return (!acpi_match_device_ids(dev, excluded_id_list));
}

/*
 * Compatible Device IDs
 */
#define TEST_HEX(c) \
	if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
		return 0
#define TEST_ALPHA(c) \
	if (!('@' <= (c) || (c) <= 'Z')) \
		return 0
static int __init ispnpidacpi(const char *id)
{
	TEST_ALPHA(id[0]);
	TEST_ALPHA(id[1]);
	TEST_ALPHA(id[2]);
	TEST_HEX(id[3]);
	TEST_HEX(id[4]);
	TEST_HEX(id[5]);
	TEST_HEX(id[6]);
	if (id[7] != '\0')
		return 0;
	return 1;
}

static int pnpacpi_get_resources(struct pnp_dev *dev)
{
	pnp_dbg(&dev->dev, "get resources\n");
	return pnpacpi_parse_allocated_resource(dev);
}

static int pnpacpi_set_resources(struct pnp_dev *dev)
{
	struct acpi_device *acpi_dev = dev->data;
	acpi_handle handle = acpi_dev->handle;
	struct acpi_buffer buffer;
	int ret;

	pnp_dbg(&dev->dev, "set resources\n");
	ret = pnpacpi_build_resource_template(dev, &buffer);
	if (ret)
		return ret;
	ret = pnpacpi_encode_resources(dev, &buffer);
	if (ret) {
		kfree(buffer.pointer);
		return ret;
	}
	if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
		ret = -EINVAL;
	else if (acpi_bus_power_manageable(handle))
		ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
	kfree(buffer.pointer);
	return ret;
}

static int pnpacpi_disable_resources(struct pnp_dev *dev)
{
	struct acpi_device *acpi_dev = dev->data;
	acpi_handle handle = acpi_dev->handle;
	int ret;

	dev_dbg(&dev->dev, "disable resources\n");

	/* acpi_unregister_gsi(pnp_irq(dev, 0)); */
	ret = 0;
	if (acpi_bus_power_manageable(handle))
		acpi_bus_set_power(handle, ACPI_STATE_D3);
		/* continue even if acpi_bus_set_power() fails */
	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
		ret = -ENODEV;
	return ret;
}

#ifdef CONFIG_ACPI_SLEEP
static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
{
	struct acpi_device *acpi_dev = dev->data;
	acpi_handle handle = acpi_dev->handle;

	return acpi_bus_can_wakeup(handle);
}

static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
{
	struct acpi_device *acpi_dev = dev->data;
	acpi_handle handle = acpi_dev->handle;
	int power_state;

	if (device_can_wakeup(&dev->dev)) {
		int rc = acpi_pm_device_sleep_wake(&dev->dev,
				device_may_wakeup(&dev->dev));

		if (rc)
			return rc;
	}
	power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
	if (power_state < 0)
		power_state = (state.event == PM_EVENT_ON) ?
				ACPI_STATE_D0 : ACPI_STATE_D3;

	/* acpi_bus_set_power() often fails (keyboard port can't be
	 * powered-down?), and in any case, our return value is ignored
	 * by pnp_bus_suspend().  Hence we don't revert the wakeup
	 * setting if the set_power fails.
	 */
	return acpi_bus_set_power(handle, power_state);
}

static int pnpacpi_resume(struct pnp_dev *dev)
{
	struct acpi_device *acpi_dev = dev->data;
	acpi_handle handle = acpi_dev->handle;

	if (device_may_wakeup(&dev->dev))
		acpi_pm_device_sleep_wake(&dev->dev, false);
	return acpi_bus_set_power(handle, ACPI_STATE_D0);
}
#endif

struct pnp_protocol pnpacpi_protocol = {
	.name	 = "Plug and Play ACPI",
	.get	 = pnpacpi_get_resources,
	.set	 = pnpacpi_set_resources,
	.disable = pnpacpi_disable_resources,
#ifdef CONFIG_ACPI_SLEEP
	.can_wakeup = pnpacpi_can_wakeup,
	.suspend = pnpacpi_suspend,
	.resume = pnpacpi_resume,
#endif
};
EXPORT_SYMBOL(pnpacpi_protocol);

static int __init pnpacpi_add_device(struct acpi_device *device)
{
	acpi_handle temp = NULL;
	acpi_status status;
	struct pnp_dev *dev;
	struct acpi_hardware_id *id;

	/*
	 * If a PnPacpi device is not present , the device
	 * driver should not be loaded.
	 */
	status = acpi_get_handle(device->handle, "_CRS", &temp);
	if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
	    is_exclusive_device(device) || (!device->status.present))
		return 0;

	dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
	if (!dev)
		return -ENOMEM;

	dev->data = device;
	/* .enabled means the device can decode the resources */
	dev->active = device->status.enabled;
	status = acpi_get_handle(device->handle, "_SRS", &temp);
	if (ACPI_SUCCESS(status))
		dev->capabilities |= PNP_CONFIGURABLE;
	dev->capabilities |= PNP_READ;
	if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
		dev->capabilities |= PNP_WRITE;
	if (device->flags.removable)
		dev->capabilities |= PNP_REMOVABLE;
	status = acpi_get_handle(device->handle, "_DIS", &temp);
	if (ACPI_SUCCESS(status))
		dev->capabilities |= PNP_DISABLE;

	if (strlen(acpi_device_name(device)))
		strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
	else
		strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));

	if (dev->active)
		pnpacpi_parse_allocated_resource(dev);

	if (dev->capabilities & PNP_CONFIGURABLE)
		pnpacpi_parse_resource_option_data(dev);

	list_for_each_entry(id, &device->pnp.ids, list) {
		if (!strcmp(id->id, acpi_device_hid(device)))
			continue;
		if (!ispnpidacpi(id->id))
			continue;
		pnp_add_id(dev, id->id);
	}

	/* clear out the damaged flags */
	if (!dev->active)
		pnp_init_resources(dev);
	pnp_add_device(dev);
	num++;

	return AE_OK;
}

static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
						     u32 lvl, void *context,
						     void **rv)
{
	struct acpi_device *device;

	if (!acpi_bus_get_device(handle, &device))
		pnpacpi_add_device(device);
	else
		return AE_CTRL_DEPTH;
	return AE_OK;
}

static int __init acpi_pnp_match(struct device *dev, void *_pnp)
{
	struct acpi_device *acpi = to_acpi_device(dev);
	struct pnp_dev *pnp = _pnp;

	/* true means it matched */
	return !acpi_get_physical_device(acpi->handle)
	    && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
}

static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
{
	struct device *adev;
	struct acpi_device *acpi;

	adev = bus_find_device(&acpi_bus_type, NULL,
			       to_pnp_dev(dev), acpi_pnp_match);
	if (!adev)
		return -ENODEV;

	acpi = to_acpi_device(adev);
	*handle = acpi->handle;
	put_device(adev);
	return 0;
}

/* complete initialization of a PNPACPI device includes having
 * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
 */
static struct acpi_bus_type __initdata acpi_pnp_bus = {
	.bus	     = &pnp_bus_type,
	.find_device = acpi_pnp_find_device,
};

int pnpacpi_disabled __initdata;
static int __init pnpacpi_init(void)
{
	if (acpi_disabled || pnpacpi_disabled) {
		printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
		return 0;
	}
	printk(KERN_INFO "pnp: PnP ACPI init\n");
	pnp_register_protocol(&pnpacpi_protocol);
	register_acpi_bus_type(&acpi_pnp_bus);
	acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
	printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
	unregister_acpi_bus_type(&acpi_pnp_bus);
	pnp_platform_devices = 1;
	return 0;
}

fs_initcall(pnpacpi_init);

static int __init pnpacpi_setup(char *str)
{
	if (str == NULL)
		return 1;
	if (!strncmp(str, "off", 3))
		pnpacpi_disabled = 1;
	return 1;
}

__setup("pnpacpi=", pnpacpi_setup);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* pnpacpi -- PnP ACPI driver
	3	*
	4	* Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
	5	* Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
55955aad	6	*
1da177e4 LT	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2, or (at your option) any
	10	* later version.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
55955aad	21
1da177e4 LT	22	#include <linux/acpi.h>
1da177e4 LT	23	#include <linux/pnp.h>
5a0e3ad6	24	#include <linux/slab.h>
29b71a1c	25	#include <linux/mod_devicetable.h>
1da177e4	26	#include <acpi/acpi_bus.h>
29b71a1c	27
1692b27b	28	#include "../base.h"
1da177e4 LT	29	#include "pnpacpi.h"
	30
	31	static int num = 0;
	32
c4bb6f5a MC	33	/* We need only to blacklist devices that have already an acpi driver that
	34	* can't use pnp layer. We don't need to blacklist device that are directly
	35	* used by the kernel (PCI root, ...), as it is harmless and there were
	36	* already present in pnpbios. But there is an exception for devices that
	37	* have irqs (PIC, Timer) because we call acpi_register_gsi.
07d4e9af	38	* Finally, only devices that have a CRS method need to be in this list.
c4bb6f5a	39	*/
6bf69b5e	40	static struct acpi_device_id excluded_id_list[] __initdata = {
9dd78466 BH	41	{"PNP0C09", 0}, /* EC */
	42	{"PNP0C0F", 0}, /* Link device */
	43	{"PNP0000", 0}, /* PIC */
	44	{"PNP0100", 0}, /* Timer */
29b71a1c TR	45	{"", 0},
	46	};
	47
9448b0d4	48	static inline int __init is_exclusive_device(struct acpi_device *dev)
1da177e4	49	{
29b71a1c	50	return (!acpi_match_device_ids(dev, excluded_id_list));
1da177e4 LT	51	}
1da177e4 LT	52
1da177e4 LT	53	/*
	54	* Compatible Device IDs
	55	*/
	56	#define TEST_HEX(c) \
	57	if (!(('0' <= (c) && (c) <= '9') \|\| ('A' <= (c) && (c) <= 'F'))) \
	58	return 0
	59	#define TEST_ALPHA(c) \
	60	if (!('@' <= (c) \|\| (c) <= 'Z')) \
	61	return 0
620e112c	62	static int __init ispnpidacpi(const char *id)
1da177e4 LT	63	{
	64	TEST_ALPHA(id[0]);
	65	TEST_ALPHA(id[1]);
	66	TEST_ALPHA(id[2]);
	67	TEST_HEX(id[3]);
	68	TEST_HEX(id[4]);
	69	TEST_HEX(id[5]);
	70	TEST_HEX(id[6]);
	71	if (id[7] != '\0')
	72	return 0;
	73	return 1;
	74	}
	75
59284cb4	76	static int pnpacpi_get_resources(struct pnp_dev *dev)
1da177e4	77	{
2f53432c	78	pnp_dbg(&dev->dev, "get resources\n");
d152cf5d	79	return pnpacpi_parse_allocated_resource(dev);
1da177e4 LT	80	}
1da177e4 LT	81
59284cb4	82	static int pnpacpi_set_resources(struct pnp_dev *dev)
1da177e4	83	{
c4da6940 BH	84	struct acpi_device *acpi_dev = dev->data;
c4da6940 BH	85	acpi_handle handle = acpi_dev->handle;
1da177e4	86	struct acpi_buffer buffer;
cdef6254	87	int ret;
1da177e4	88
2f53432c	89	pnp_dbg(&dev->dev, "set resources\n");
cdef6254	90	ret = pnpacpi_build_resource_template(dev, &buffer);
1da177e4 LT	91	if (ret)
1da177e4 LT	92	return ret;
4ab55d8d	93	ret = pnpacpi_encode_resources(dev, &buffer);
1da177e4 LT	94	if (ret) {
	95	kfree(buffer.pointer);
	96	return ret;
	97	}
6328a574	98	if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
1da177e4	99	ret = -EINVAL;
6328a574 WS	100	else if (acpi_bus_power_manageable(handle))
6328a574 WS	101	ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
1da177e4 LT	102	kfree(buffer.pointer);
	103	return ret;
	104	}
	105
	106	static int pnpacpi_disable_resources(struct pnp_dev *dev)
	107	{
c4da6940 BH	108	struct acpi_device *acpi_dev = dev->data;
c4da6940 BH	109	acpi_handle handle = acpi_dev->handle;
6328a574 WS	110	int ret;
	111
	112	dev_dbg(&dev->dev, "disable resources\n");
55955aad	113
1da177e4	114	/* acpi_unregister_gsi(pnp_irq(dev, 0)); */
6328a574	115	ret = 0;
19bde778 LB	116	if (acpi_bus_power_manageable(handle))
	117	acpi_bus_set_power(handle, ACPI_STATE_D3);
	118	/* continue even if acpi_bus_set_power() fails */
6328a574 WS	119	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
	120	ret = -ENODEV;
	121	return ret;
1da177e4 LT	122	}
1da177e4 LT	123
673d5b43	124	#ifdef CONFIG_ACPI_SLEEP
b14e033e AS	125	static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
	126	{
	127	struct acpi_device *acpi_dev = dev->data;
	128	acpi_handle handle = acpi_dev->handle;
	129
	130	return acpi_bus_can_wakeup(handle);
	131	}
	132
fc30e68e SL	133	static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
fc30e68e SL	134	{
c4da6940 BH	135	struct acpi_device *acpi_dev = dev->data;
c4da6940 BH	136	acpi_handle handle = acpi_dev->handle;
36e02b62 RW	137	int power_state;
36e02b62 RW	138
b14e033e AS	139	if (device_can_wakeup(&dev->dev)) {
	140	int rc = acpi_pm_device_sleep_wake(&dev->dev,
	141	device_may_wakeup(&dev->dev));
	142
	143	if (rc)
	144	return rc;
	145	}
2fe2de5f	146	power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
36e02b62 RW	147	if (power_state < 0)
	148	power_state = (state.event == PM_EVENT_ON) ?
	149	ACPI_STATE_D0 : ACPI_STATE_D3;
	150
b14e033e AS	151	/* acpi_bus_set_power() often fails (keyboard port can't be
	152	* powered-down?), and in any case, our return value is ignored
	153	* by pnp_bus_suspend(). Hence we don't revert the wakeup
	154	* setting if the set_power fails.
	155	*/
c4da6940	156	return acpi_bus_set_power(handle, power_state);
fc30e68e SL	157	}
	158
	159	static int pnpacpi_resume(struct pnp_dev *dev)
	160	{
c4da6940 BH	161	struct acpi_device *acpi_dev = dev->data;
	162	acpi_handle handle = acpi_dev->handle;
	163
b14e033e AS	164	if (device_may_wakeup(&dev->dev))
b14e033e AS	165	acpi_pm_device_sleep_wake(&dev->dev, false);
c4da6940	166	return acpi_bus_set_power(handle, ACPI_STATE_D0);
fc30e68e	167	}
673d5b43	168	#endif
fc30e68e	169
9065ce45	170	struct pnp_protocol pnpacpi_protocol = {
07d4e9af BH	171	.name = "Plug and Play ACPI",
	172	.get = pnpacpi_get_resources,
	173	.set = pnpacpi_set_resources,
1da177e4	174	.disable = pnpacpi_disable_resources,
673d5b43	175	#ifdef CONFIG_ACPI_SLEEP
b14e033e	176	.can_wakeup = pnpacpi_can_wakeup,
fc30e68e SL	177	.suspend = pnpacpi_suspend,
fc30e68e SL	178	.resume = pnpacpi_resume,
673d5b43	179	#endif
1da177e4	180	};
9065ce45	181	EXPORT_SYMBOL(pnpacpi_protocol);
1da177e4 LT	182
	183	static int __init pnpacpi_add_device(struct acpi_device *device)
	184	{
	185	acpi_handle temp = NULL;
	186	acpi_status status;
1da177e4	187	struct pnp_dev *dev;
7f47fa6c	188	struct acpi_hardware_id *id;
1da177e4	189
39a0ad87 ZY	190	/*
	191	* If a PnPacpi device is not present , the device
	192	* driver should not be loaded.
	193	*/
07b0120d MC	194	status = acpi_get_handle(device->handle, "_CRS", &temp);
07b0120d MC	195	if (ACPI_FAILURE(status) \|\| !ispnpidacpi(acpi_device_hid(device)) \|\|
39a0ad87	196	is_exclusive_device(device) \|\| (!device->status.present))
1da177e4 LT	197	return 0;
1da177e4 LT	198
bda1e4e5 BH	199	dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
bda1e4e5 BH	200	if (!dev)
1da177e4	201	return -ENOMEM;
bda1e4e5	202
c4da6940	203	dev->data = device;
07d4e9af	204	/* .enabled means the device can decode the resources */
1da177e4 LT	205	dev->active = device->status.enabled;
	206	status = acpi_get_handle(device->handle, "_SRS", &temp);
	207	if (ACPI_SUCCESS(status))
	208	dev->capabilities \|= PNP_CONFIGURABLE;
	209	dev->capabilities \|= PNP_READ;
856608ee	210	if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
1da177e4 LT	211	dev->capabilities \|= PNP_WRITE;
	212	if (device->flags.removable)
	213	dev->capabilities \|= PNP_REMOVABLE;
	214	status = acpi_get_handle(device->handle, "_DIS", &temp);
	215	if (ACPI_SUCCESS(status))
	216	dev->capabilities \|= PNP_DISABLE;
	217
1da177e4 LT	218	if (strlen(acpi_device_name(device)))
	219	strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
	220	else
	221	strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
	222
d152cf5d BH	223	if (dev->active)
d152cf5d BH	224	pnpacpi_parse_allocated_resource(dev);
1da177e4	225
d152cf5d BH	226	if (dev->capabilities & PNP_CONFIGURABLE)
d152cf5d BH	227	pnpacpi_parse_resource_option_data(dev);
55955aad	228
7f47fa6c BH	229	list_for_each_entry(id, &device->pnp.ids, list) {
	230	if (!strcmp(id->id, acpi_device_hid(device)))
	231	continue;
	232	if (!ispnpidacpi(id->id))
	233	continue;
	234	pnp_add_id(dev, id->id);
1da177e4 LT	235	}
	236
	237	/* clear out the damaged flags */
	238	if (!dev->active)
f4490002	239	pnp_init_resources(dev);
1da177e4	240	pnp_add_device(dev);
9dd78466	241	num++;
1da177e4 LT	242
1da177e4 LT	243	return AE_OK;
1da177e4 LT	244	}
	245
	246	static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
9dd78466 BH	247	u32 lvl, void *context,
9dd78466 BH	248	void **rv)
1da177e4 LT	249	{
	250	struct acpi_device *device;
	251
	252	if (!acpi_bus_get_device(handle, &device))
	253	pnpacpi_add_device(device);
	254	else
	255	return AE_CTRL_DEPTH;
	256	return AE_OK;
	257	}
	258
55955aad DB	259	static int __init acpi_pnp_match(struct device dev, void _pnp)
55955aad DB	260	{
9dd78466 BH	261	struct acpi_device *acpi = to_acpi_device(dev);
9dd78466 BH	262	struct pnp_dev *pnp = _pnp;
55955aad DB	263
55955aad DB	264	/* true means it matched */
1131b938	265	return !acpi_get_physical_device(acpi->handle)
ea8d82fd	266	&& compare_pnp_id(pnp->id, acpi_device_hid(acpi));
55955aad DB	267	}
55955aad DB	268
9dd78466	269	static int __init acpi_pnp_find_device(struct device dev, acpi_handle handle)
55955aad	270	{
9dd78466 BH	271	struct device *adev;
9dd78466 BH	272	struct acpi_device *acpi;
55955aad DB	273
55955aad DB	274	adev = bus_find_device(&acpi_bus_type, NULL,
9dd78466	275	to_pnp_dev(dev), acpi_pnp_match);
55955aad DB	276	if (!adev)
	277	return -ENODEV;
	278
	279	acpi = to_acpi_device(adev);
	280	*handle = acpi->handle;
	281	put_device(adev);
	282	return 0;
	283	}
	284
	285	/* complete initialization of a PNPACPI device includes having
	286	* pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
	287	*/
	288	static struct acpi_bus_type __initdata acpi_pnp_bus = {
07d4e9af	289	.bus = &pnp_bus_type,
55955aad DB	290	.find_device = acpi_pnp_find_device,
	291	};
	292
1da177e4	293	int pnpacpi_disabled __initdata;
b449f63c	294	static int __init pnpacpi_init(void)
1da177e4 LT	295	{
1da177e4 LT	296	if (acpi_disabled \|\| pnpacpi_disabled) {
c865d2f6	297	printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
1da177e4 LT	298	return 0;
1da177e4 LT	299	}
c865d2f6	300	printk(KERN_INFO "pnp: PnP ACPI init\n");
1da177e4	301	pnp_register_protocol(&pnpacpi_protocol);
55955aad	302	register_acpi_bus_type(&acpi_pnp_bus);
1da177e4	303	acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
c865d2f6	304	printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
55955aad	305	unregister_acpi_bus_type(&acpi_pnp_bus);
8f81dd14	306	pnp_platform_devices = 1;
1da177e4 LT	307	return 0;
1da177e4 LT	308	}
9dd78466	309
ed458df4	310	fs_initcall(pnpacpi_init);
1da177e4 LT	311
	312	static int __init pnpacpi_setup(char *str)
	313	{
	314	if (str == NULL)
	315	return 1;
	316	if (!strncmp(str, "off", 3))
	317	pnpacpi_disabled = 1;
	318	return 1;
	319	}
9dd78466	320
1da177e4	321	__setup("pnpacpi=", pnpacpi_setup);