[linux-2.6-block.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/mod_devicetable.h>
#include <acpi/acpi_bus.h>
#include <acpi/actypes.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 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(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 void __init pnpidacpi_to_pnpid(char *id, char *str)
{
	str[0] = id[0];
	str[1] = id[1];
	str[2] = id[2];
	str[3] = tolower(id[3]);
	str[4] = tolower(id[4]);
	str[5] = tolower(id[5]);
	str[6] = tolower(id[6]);
	str[7] = '\0';
}

static int pnpacpi_get_resources(struct pnp_dev *dev,
				 struct pnp_resource_table *res)
{
	acpi_status status;

	status = pnpacpi_parse_allocated_resource((acpi_handle) dev->data,
						  &dev->res);
	return ACPI_FAILURE(status) ? -ENODEV : 0;
}

static int pnpacpi_set_resources(struct pnp_dev *dev,
				 struct pnp_resource_table *res)
{
	acpi_handle handle = dev->data;
	struct acpi_buffer buffer;
	int ret = 0;
	acpi_status status;

	ret = pnpacpi_build_resource_template(handle, &buffer);
	if (ret)
		return ret;
	ret = pnpacpi_encode_resources(res, &buffer);
	if (ret) {
		kfree(buffer.pointer);
		return ret;
	}
	status = acpi_set_current_resources(handle, &buffer);
	if (ACPI_FAILURE(status))
		ret = -EINVAL;
	kfree(buffer.pointer);
	return ret;
}

static int pnpacpi_disable_resources(struct pnp_dev *dev)
{
	acpi_status status;

	/* acpi_unregister_gsi(pnp_irq(dev, 0)); */
	status = acpi_evaluate_object((acpi_handle) dev->data,
				      "_DIS", NULL, NULL);
	return ACPI_FAILURE(status) ? -ENODEV : 0;
}

#ifdef CONFIG_ACPI_SLEEP
static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
{
	int power_state;

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

	return acpi_bus_set_power((acpi_handle) dev->data, power_state);
}

static int pnpacpi_resume(struct pnp_dev *dev)
{
	return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
}
#endif

static 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
	.suspend = pnpacpi_suspend,
	.resume = pnpacpi_resume,
#endif
};

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

	status = acpi_get_handle(device->handle, "_CRS", &temp);
	if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
	    is_exclusive_device(device))
		return 0;

	dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
	if (!dev) {
		pnp_err("Out of memory");
		return -ENOMEM;
	}
	dev->data = device->handle;
	/* .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;

	dev->protocol = &pnpacpi_protocol;

	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));

	dev->number = num;

	/* set the initial values for the PnP device */
	dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
	if (!dev_id)
		goto err;
	pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
	pnp_add_id(dev_id, dev);

	if (dev->active) {
		/* parse allocated resource */
		status = pnpacpi_parse_allocated_resource(device->handle,
							  &dev->res);
		if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
			pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s",
				dev_id->id);
			goto err1;
		}
	}

	if (dev->capabilities & PNP_CONFIGURABLE) {
		status = pnpacpi_parse_resource_option_data(device->handle,
							    dev);
		if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
			pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s",
				dev_id->id);
			goto err1;
		}
	}

	/* parse compatible ids */
	if (device->flags.compatible_ids) {
		struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
		int i;

		for (i = 0; i < cid_list->count; i++) {
			if (!ispnpidacpi(cid_list->id[i].value))
				continue;
			dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
			if (!dev_id)
				continue;

			pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id);
			pnp_add_id(dev_id, dev);
		}
	}

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

	return AE_OK;
err1:
	kfree(dev_id);
err:
	kfree(dev);
	return -EINVAL;
}

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->flags.hardware_id
	    && !acpi_get_physical_device(acpi->handle)
	    && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
}

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) {
		pnp_info("PnP ACPI: disabled");
		return 0;
	}
	pnp_info("PnP ACPI init");
	pnp_register_protocol(&pnpacpi_protocol);
	register_acpi_bus_type(&acpi_pnp_bus);
	acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
	pnp_info("PnP ACPI: found %d devices", num);
	unregister_acpi_bus_type(&acpi_pnp_bus);
	pnp_platform_devices = 1;
	return 0;
}

subsys_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>
29b71a1c	24	#include <linux/mod_devicetable.h>
1da177e4	25	#include <acpi/acpi_bus.h>
29b71a1c TR	26	#include <acpi/actypes.h>
29b71a1c TR	27
1da177e4 LT	28	#include "pnpacpi.h"
	29
	30	static int num = 0;
	31
c4bb6f5a	32	/* We need only to blacklist devices that have already an acpi driver that
	33	* can't use pnp layer. We don't need to blacklist device that are directly
	34	* used by the kernel (PCI root, ...), as it is harmless and there were
	35	* already present in pnpbios. But there is an exception for devices that
	36	* have irqs (PIC, Timer) because we call acpi_register_gsi.
07d4e9af	37	* Finally, only devices that have a CRS method need to be in this list.
c4bb6f5a	38	*/
6bf69b5e	39	static struct acpi_device_id excluded_id_list[] __initdata = {
9dd78466 BH	40	{"PNP0C09", 0}, /* EC */
	41	{"PNP0C0F", 0}, /* Link device */
	42	{"PNP0000", 0}, /* PIC */
	43	{"PNP0100", 0}, /* Timer */
29b71a1c TR	44	{"", 0},
	45	};
	46
1da177e4 LT	47	static inline int is_exclusive_device(struct acpi_device *dev)
1da177e4 LT	48	{
29b71a1c	49	return (!acpi_match_device_ids(dev, excluded_id_list));
1da177e4 LT	50	}
1da177e4 LT	51
1da177e4 LT	52	/*
	53	* Compatible Device IDs
	54	*/
	55	#define TEST_HEX(c) \
	56	if (!(('0' <= (c) && (c) <= '9') \|\| ('A' <= (c) && (c) <= 'F'))) \
	57	return 0
	58	#define TEST_ALPHA(c) \
	59	if (!('@' <= (c) \|\| (c) <= 'Z')) \
	60	return 0
	61	static int __init ispnpidacpi(char *id)
	62	{
	63	TEST_ALPHA(id[0]);
	64	TEST_ALPHA(id[1]);
	65	TEST_ALPHA(id[2]);
	66	TEST_HEX(id[3]);
	67	TEST_HEX(id[4]);
	68	TEST_HEX(id[5]);
	69	TEST_HEX(id[6]);
	70	if (id[7] != '\0')
	71	return 0;
	72	return 1;
	73	}
	74
	75	static void __init pnpidacpi_to_pnpid(char id, char str)
	76	{
	77	str[0] = id[0];
	78	str[1] = id[1];
	79	str[2] = id[2];
	80	str[3] = tolower(id[3]);
	81	str[4] = tolower(id[4]);
	82	str[5] = tolower(id[5]);
	83	str[6] = tolower(id[6]);
	84	str[7] = '\0';
	85	}
	86
9dd78466 BH	87	static int pnpacpi_get_resources(struct pnp_dev *dev,
9dd78466 BH	88	struct pnp_resource_table *res)
1da177e4 LT	89	{
1da177e4 LT	90	acpi_status status;
07d4e9af	91
9dd78466 BH	92	status = pnpacpi_parse_allocated_resource((acpi_handle) dev->data,
9dd78466 BH	93	&dev->res);
1da177e4 LT	94	return ACPI_FAILURE(status) ? -ENODEV : 0;
	95	}
	96
9dd78466 BH	97	static int pnpacpi_set_resources(struct pnp_dev *dev,
9dd78466 BH	98	struct pnp_resource_table *res)
1da177e4 LT	99	{
	100	acpi_handle handle = dev->data;
	101	struct acpi_buffer buffer;
	102	int ret = 0;
	103	acpi_status status;
	104
	105	ret = pnpacpi_build_resource_template(handle, &buffer);
	106	if (ret)
	107	return ret;
	108	ret = pnpacpi_encode_resources(res, &buffer);
	109	if (ret) {
	110	kfree(buffer.pointer);
	111	return ret;
	112	}
	113	status = acpi_set_current_resources(handle, &buffer);
	114	if (ACPI_FAILURE(status))
	115	ret = -EINVAL;
	116	kfree(buffer.pointer);
	117	return ret;
	118	}
	119
	120	static int pnpacpi_disable_resources(struct pnp_dev *dev)
	121	{
	122	acpi_status status;
55955aad	123
1da177e4	124	/* acpi_unregister_gsi(pnp_irq(dev, 0)); */
9dd78466 BH	125	status = acpi_evaluate_object((acpi_handle) dev->data,
9dd78466 BH	126	"_DIS", NULL, NULL);
1da177e4 LT	127	return ACPI_FAILURE(status) ? -ENODEV : 0;
	128	}
	129
673d5b43	130	#ifdef CONFIG_ACPI_SLEEP
fc30e68e SL	131	static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
fc30e68e SL	132	{
36e02b62 RW	133	int power_state;
	134
	135	power_state = acpi_pm_device_sleep_state(&dev->dev,
	136	device_may_wakeup(&dev->dev),
	137	NULL);
	138	if (power_state < 0)
	139	power_state = (state.event == PM_EVENT_ON) ?
	140	ACPI_STATE_D0 : ACPI_STATE_D3;
	141
	142	return acpi_bus_set_power((acpi_handle) dev->data, power_state);
fc30e68e SL	143	}
	144
	145	static int pnpacpi_resume(struct pnp_dev *dev)
	146	{
9dd78466	147	return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
fc30e68e	148	}
673d5b43	149	#endif
fc30e68e	150
b449f63c	151	static struct pnp_protocol pnpacpi_protocol = {
07d4e9af BH	152	.name = "Plug and Play ACPI",
	153	.get = pnpacpi_get_resources,
	154	.set = pnpacpi_set_resources,
1da177e4	155	.disable = pnpacpi_disable_resources,
673d5b43	156	#ifdef CONFIG_ACPI_SLEEP
fc30e68e SL	157	.suspend = pnpacpi_suspend,
fc30e68e SL	158	.resume = pnpacpi_resume,
673d5b43	159	#endif
1da177e4 LT	160	};
	161
	162	static int __init pnpacpi_add_device(struct acpi_device *device)
	163	{
	164	acpi_handle temp = NULL;
	165	acpi_status status;
	166	struct pnp_id *dev_id;
	167	struct pnp_dev *dev;
	168
07b0120d	169	status = acpi_get_handle(device->handle, "_CRS", &temp);
07b0120d	170	if (ACPI_FAILURE(status) \|\| !ispnpidacpi(acpi_device_hid(device)) \|\|
9dd78466	171	is_exclusive_device(device))
1da177e4 LT	172	return 0;
1da177e4 LT	173
9dd78466	174	dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
1da177e4 LT	175	if (!dev) {
	176	pnp_err("Out of memory");
	177	return -ENOMEM;
	178	}
	179	dev->data = device->handle;
07d4e9af	180	/* .enabled means the device can decode the resources */
1da177e4 LT	181	dev->active = device->status.enabled;
	182	status = acpi_get_handle(device->handle, "_SRS", &temp);
	183	if (ACPI_SUCCESS(status))
	184	dev->capabilities \|= PNP_CONFIGURABLE;
	185	dev->capabilities \|= PNP_READ;
856608ee	186	if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
1da177e4 LT	187	dev->capabilities \|= PNP_WRITE;
	188	if (device->flags.removable)
	189	dev->capabilities \|= PNP_REMOVABLE;
	190	status = acpi_get_handle(device->handle, "_DIS", &temp);
	191	if (ACPI_SUCCESS(status))
	192	dev->capabilities \|= PNP_DISABLE;
	193
	194	dev->protocol = &pnpacpi_protocol;
	195
	196	if (strlen(acpi_device_name(device)))
	197	strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
	198	else
	199	strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
	200
	201	dev->number = num;
55955aad	202
1da177e4	203	/* set the initial values for the PnP device */
cd861280	204	dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
1da177e4 LT	205	if (!dev_id)
	206	goto err;
	207	pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
	208	pnp_add_id(dev_id, dev);
	209
9dd78466	210	if (dev->active) {
1da177e4	211	/* parse allocated resource */
07d4e9af BH	212	status = pnpacpi_parse_allocated_resource(device->handle,
07d4e9af BH	213	&dev->res);
1da177e4	214	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
9dd78466 BH	215	pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s",
9dd78466 BH	216	dev_id->id);
1da177e4 LT	217	goto err1;
	218	}
	219	}
	220
9dd78466	221	if (dev->capabilities & PNP_CONFIGURABLE) {
55955aad	222	status = pnpacpi_parse_resource_option_data(device->handle,
9dd78466	223	dev);
1da177e4	224	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
9dd78466 BH	225	pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s",
9dd78466 BH	226	dev_id->id);
1da177e4 LT	227	goto err1;
	228	}
	229	}
55955aad	230
1da177e4 LT	231	/* parse compatible ids */
	232	if (device->flags.compatible_ids) {
	233	struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
	234	int i;
	235
	236	for (i = 0; i < cid_list->count; i++) {
	237	if (!ispnpidacpi(cid_list->id[i].value))
	238	continue;
cd861280	239	dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
1da177e4 LT	240	if (!dev_id)
	241	continue;
	242
	243	pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id);
	244	pnp_add_id(dev_id, dev);
	245	}
	246	}
	247
	248	/* clear out the damaged flags */
	249	if (!dev->active)
	250	pnp_init_resource_table(&dev->res);
	251	pnp_add_device(dev);
9dd78466	252	num++;
1da177e4 LT	253
1da177e4 LT	254	return AE_OK;
1e0aa9ad	255	err1:
1da177e4	256	kfree(dev_id);
1e0aa9ad	257	err:
1da177e4 LT	258	kfree(dev);
	259	return -EINVAL;
	260	}
	261
	262	static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
9dd78466 BH	263	u32 lvl, void *context,
9dd78466 BH	264	void **rv)
1da177e4 LT	265	{
	266	struct acpi_device *device;
	267
	268	if (!acpi_bus_get_device(handle, &device))
	269	pnpacpi_add_device(device);
	270	else
	271	return AE_CTRL_DEPTH;
	272	return AE_OK;
	273	}
	274
55955aad DB	275	static int __init acpi_pnp_match(struct device dev, void _pnp)
55955aad DB	276	{
9dd78466 BH	277	struct acpi_device *acpi = to_acpi_device(dev);
9dd78466 BH	278	struct pnp_dev *pnp = _pnp;
55955aad DB	279
	280	/* true means it matched */
	281	return acpi->flags.hardware_id
9dd78466 BH	282	&& !acpi_get_physical_device(acpi->handle)
9dd78466 BH	283	&& compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
55955aad DB	284	}
55955aad DB	285
9dd78466	286	static int __init acpi_pnp_find_device(struct device dev, acpi_handle handle)
55955aad	287	{
9dd78466 BH	288	struct device *adev;
9dd78466 BH	289	struct acpi_device *acpi;
55955aad DB	290
55955aad DB	291	adev = bus_find_device(&acpi_bus_type, NULL,
9dd78466	292	to_pnp_dev(dev), acpi_pnp_match);
55955aad DB	293	if (!adev)
	294	return -ENODEV;
	295
	296	acpi = to_acpi_device(adev);
	297	*handle = acpi->handle;
	298	put_device(adev);
	299	return 0;
	300	}
	301
	302	/* complete initialization of a PNPACPI device includes having
	303	* pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
	304	*/
	305	static struct acpi_bus_type __initdata acpi_pnp_bus = {
07d4e9af	306	.bus = &pnp_bus_type,
55955aad DB	307	.find_device = acpi_pnp_find_device,
	308	};
	309
1da177e4	310	int pnpacpi_disabled __initdata;
b449f63c	311	static int __init pnpacpi_init(void)
1da177e4 LT	312	{
	313	if (acpi_disabled \|\| pnpacpi_disabled) {
	314	pnp_info("PnP ACPI: disabled");
	315	return 0;
	316	}
	317	pnp_info("PnP ACPI init");
	318	pnp_register_protocol(&pnpacpi_protocol);
55955aad	319	register_acpi_bus_type(&acpi_pnp_bus);
1da177e4 LT	320	acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
1da177e4 LT	321	pnp_info("PnP ACPI: found %d devices", num);
55955aad	322	unregister_acpi_bus_type(&acpi_pnp_bus);
8f81dd14	323	pnp_platform_devices = 1;
1da177e4 LT	324	return 0;
1da177e4 LT	325	}
9dd78466	326
1da177e4 LT	327	subsys_initcall(pnpacpi_init);
	328
	329	static int __init pnpacpi_setup(char *str)
	330	{
	331	if (str == NULL)
	332	return 1;
	333	if (!strncmp(str, "off", 3))
	334	pnpacpi_disabled = 1;
	335	return 1;
	336	}
9dd78466	337
1da177e4	338	__setup("pnpacpi=", pnpacpi_setup);