[mirror_ubuntu-eoan-kernel.git] / drivers / pnp / pnpacpi / core.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * pnpacpi -- PnP ACPI driver
 *
 * Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
 * Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
 */

#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/pnp.h>
#include <linux/slab.h>
#include <linux/mod_devicetable.h>

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

static int num;

/*
 * Compatible Device IDs
 */
#define TEST_HEX(c) \
	if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
		return 0
#define TEST_ALPHA(c) \
	if (!('A' <= (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;
	acpi_handle handle;
	int ret = 0;

	pnp_dbg(&dev->dev, "set resources\n");

	acpi_dev = ACPI_COMPANION(&dev->dev);
	if (!acpi_dev) {
		dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
		return -ENODEV;
	}

	if (WARN_ON_ONCE(acpi_dev != dev->data))
		dev->data = acpi_dev;

	handle = acpi_dev->handle;
	if (acpi_has_method(handle, METHOD_NAME__SRS)) {
		struct acpi_buffer buffer;

		ret = pnpacpi_build_resource_template(dev, &buffer);
		if (ret)
			return ret;

		ret = pnpacpi_encode_resources(dev, &buffer);
		if (!ret) {
			acpi_status status;

			status = acpi_set_current_resources(handle, &buffer);
			if (ACPI_FAILURE(status))
				ret = -EIO;
		}
		kfree(buffer.pointer);
	}
	if (!ret && acpi_device_power_manageable(acpi_dev))
		ret = acpi_device_set_power(acpi_dev, ACPI_STATE_D0);

	return ret;
}

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

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

	acpi_dev = ACPI_COMPANION(&dev->dev);
	if (!acpi_dev) {
		dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
		return 0;
	}

	/* acpi_unregister_gsi(pnp_irq(dev, 0)); */
	if (acpi_device_power_manageable(acpi_dev))
		acpi_device_set_power(acpi_dev, ACPI_STATE_D3_COLD);

	/* continue even if acpi_device_set_power() fails */
	status = acpi_evaluate_object(acpi_dev->handle, "_DIS", NULL, NULL);
	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
		return -ENODEV;

	return 0;
}

#ifdef CONFIG_ACPI_SLEEP
static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
{
	struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);

	if (!acpi_dev) {
		dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
		return false;
	}

	return acpi_bus_can_wakeup(acpi_dev->handle);
}

static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
{
	struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
	int error = 0;

	if (!acpi_dev) {
		dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
		return 0;
	}

	if (device_can_wakeup(&dev->dev)) {
		error = acpi_pm_set_device_wakeup(&dev->dev,
					      device_may_wakeup(&dev->dev));
		if (error)
			return error;
	}

	if (acpi_device_power_manageable(acpi_dev)) {
		int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
							ACPI_STATE_D3_COLD);
		if (power_state < 0)
			power_state = (state.event == PM_EVENT_ON) ?
					ACPI_STATE_D0 : ACPI_STATE_D3_COLD;

		/*
		 * acpi_device_set_power() can fail (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.
		 */
		error = acpi_device_set_power(acpi_dev, power_state);
	}

	return error;
}

static int pnpacpi_resume(struct pnp_dev *dev)
{
	struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
	int error = 0;

	if (!acpi_dev) {
		dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
		return -ENODEV;
	}

	if (device_may_wakeup(&dev->dev))
		acpi_pm_set_device_wakeup(&dev->dev, false);

	if (acpi_device_power_manageable(acpi_dev))
		error = acpi_device_set_power(acpi_dev, ACPI_STATE_D0);

	return error;
}
#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 const char *__init pnpacpi_get_id(struct acpi_device *device)
{
	struct acpi_hardware_id *id;

	list_for_each_entry(id, &device->pnp.ids, list) {
		if (ispnpidacpi(id->id))
			return id->id;
	}

	return NULL;
}

static int __init pnpacpi_add_device(struct acpi_device *device)
{
	struct pnp_dev *dev;
	const char *pnpid;
	struct acpi_hardware_id *id;
	int error;

	/* Skip devices that are already bound */
	if (device->physical_node_count)
		return 0;

	/*
	 * If a PnPacpi device is not present , the device
	 * driver should not be loaded.
	 */
	if (!acpi_has_method(device->handle, "_CRS"))
		return 0;

	pnpid = pnpacpi_get_id(device);
	if (!pnpid)
		return 0;

	if (!device->status.present)
		return 0;

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

	ACPI_COMPANION_SET(&dev->dev, device);
	dev->data = device;
	/* .enabled means the device can decode the resources */
	dev->active = device->status.enabled;
	if (acpi_has_method(device->handle, "_SRS"))
		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;
	if (acpi_has_method(device->handle, "_DIS"))
		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, pnpid))
			continue;
		if (!ispnpidacpi(id->id))
			continue;
		pnp_add_id(dev, id->id);
	}

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

	error = pnp_add_device(dev);
	if (error) {
		put_device(&dev->dev);
		return error;
	}

	num++;

	return 0;
}

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))
		return AE_CTRL_DEPTH;
	if (acpi_is_pnp_device(device))
		pnpacpi_add_device(device);
	return AE_OK;
}

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);
	acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
	printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
	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
660662f8	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* pnpacpi -- PnP ACPI driver
	4	*
	5	* Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
	6	* Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
1da177e4	7	*/
55955aad	8
26e6e9e5	9	#include <linux/export.h>
1da177e4 LT	10	#include <linux/acpi.h>
1da177e4 LT	11	#include <linux/pnp.h>
5a0e3ad6	12	#include <linux/slab.h>
29b71a1c	13	#include <linux/mod_devicetable.h>
29b71a1c	14
1692b27b	15	#include "../base.h"
1da177e4 LT	16	#include "pnpacpi.h"
1da177e4 LT	17
420a0f66	18	static int num;
1da177e4	19
1da177e4 LT	20	/*
	21	* Compatible Device IDs
	22	*/
	23	#define TEST_HEX(c) \
	24	if (!(('0' <= (c) && (c) <= '9') \|\| ('A' <= (c) && (c) <= 'F'))) \
	25	return 0
	26	#define TEST_ALPHA(c) \
cdc87c5a	27	if (!('A' <= (c) && (c) <= 'Z')) \
1da177e4	28	return 0
620e112c	29	static int __init ispnpidacpi(const char *id)
1da177e4 LT	30	{
	31	TEST_ALPHA(id[0]);
	32	TEST_ALPHA(id[1]);
	33	TEST_ALPHA(id[2]);
	34	TEST_HEX(id[3]);
	35	TEST_HEX(id[4]);
	36	TEST_HEX(id[5]);
	37	TEST_HEX(id[6]);
	38	if (id[7] != '\0')
	39	return 0;
	40	return 1;
	41	}
	42
59284cb4	43	static int pnpacpi_get_resources(struct pnp_dev *dev)
1da177e4	44	{
2f53432c	45	pnp_dbg(&dev->dev, "get resources\n");
d152cf5d	46	return pnpacpi_parse_allocated_resource(dev);
1da177e4 LT	47	}
1da177e4 LT	48
59284cb4	49	static int pnpacpi_set_resources(struct pnp_dev *dev)
1da177e4	50	{
cc8e7a35 RW	51	struct acpi_device *acpi_dev;
cc8e7a35 RW	52	acpi_handle handle;
a8d22396	53	int ret = 0;
1da177e4	54
2f53432c	55	pnp_dbg(&dev->dev, "set resources\n");
cc8e7a35	56
e70dba60 RW	57	acpi_dev = ACPI_COMPANION(&dev->dev);
e70dba60 RW	58	if (!acpi_dev) {
cc8e7a35 RW	59	dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
	60	return -ENODEV;
	61	}
	62
a6b5e88c RW	63	if (WARN_ON_ONCE(acpi_dev != dev->data))
	64	dev->data = acpi_dev;
	65
e70dba60	66	handle = acpi_dev->handle;
a8d22396 RW	67	if (acpi_has_method(handle, METHOD_NAME__SRS)) {
	68	struct acpi_buffer buffer;
	69
	70	ret = pnpacpi_build_resource_template(dev, &buffer);
	71	if (ret)
	72	return ret;
	73
	74	ret = pnpacpi_encode_resources(dev, &buffer);
	75	if (!ret) {
	76	acpi_status status;
	77
	78	status = acpi_set_current_resources(handle, &buffer);
	79	if (ACPI_FAILURE(status))
	80	ret = -EIO;
	81	}
1da177e4	82	kfree(buffer.pointer);
1da177e4	83	}
e70dba60 RW	84	if (!ret && acpi_device_power_manageable(acpi_dev))
e70dba60 RW	85	ret = acpi_device_set_power(acpi_dev, ACPI_STATE_D0);
a8d22396	86
1da177e4 LT	87	return ret;
	88	}
	89
	90	static int pnpacpi_disable_resources(struct pnp_dev *dev)
	91	{
cc8e7a35	92	struct acpi_device *acpi_dev;
a8d22396	93	acpi_status status;
6328a574 WS	94
6328a574 WS	95	dev_dbg(&dev->dev, "disable resources\n");
55955aad	96
e70dba60 RW	97	acpi_dev = ACPI_COMPANION(&dev->dev);
e70dba60 RW	98	if (!acpi_dev) {
cc8e7a35 RW	99	dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
	100	return 0;
	101	}
	102
1da177e4	103	/* acpi_unregister_gsi(pnp_irq(dev, 0)); */
e70dba60 RW	104	if (acpi_device_power_manageable(acpi_dev))
e70dba60 RW	105	acpi_device_set_power(acpi_dev, ACPI_STATE_D3_COLD);
a8d22396	106
e70dba60 RW	107	/* continue even if acpi_device_set_power() fails */
e70dba60 RW	108	status = acpi_evaluate_object(acpi_dev->handle, "_DIS", NULL, NULL);
a8d22396 RW	109	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
	110	return -ENODEV;
	111
	112	return 0;
1da177e4 LT	113	}
1da177e4 LT	114
673d5b43	115	#ifdef CONFIG_ACPI_SLEEP
b14e033e AS	116	static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
b14e033e AS	117	{
e70dba60	118	struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
cc8e7a35	119
e70dba60	120	if (!acpi_dev) {
cc8e7a35 RW	121	dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
	122	return false;
	123	}
b14e033e	124
e70dba60	125	return acpi_bus_can_wakeup(acpi_dev->handle);
b14e033e AS	126	}
b14e033e AS	127
fc30e68e SL	128	static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
fc30e68e SL	129	{
e70dba60	130	struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
cc8e7a35 RW	131	int error = 0;
cc8e7a35 RW	132
e70dba60	133	if (!acpi_dev) {
cc8e7a35 RW	134	dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
	135	return 0;
	136	}
36e02b62	137
b14e033e	138	if (device_can_wakeup(&dev->dev)) {
4d183d04 RW	139	error = acpi_pm_set_device_wakeup(&dev->dev,
4d183d04 RW	140	device_may_wakeup(&dev->dev));
cc8e7a35 RW	141	if (error)
	142	return error;
	143	}
	144
e70dba60	145	if (acpi_device_power_manageable(acpi_dev)) {
ee85f543	146	int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
8ad928d5	147	ACPI_STATE_D3_COLD);
cc8e7a35 RW	148	if (power_state < 0)
cc8e7a35 RW	149	power_state = (state.event == PM_EVENT_ON) ?
8ad928d5	150	ACPI_STATE_D0 : ACPI_STATE_D3_COLD;
cc8e7a35 RW	151
cc8e7a35 RW	152	/*
e70dba60	153	* acpi_device_set_power() can fail (keyboard port can't be
cc8e7a35 RW	154	* powered-down?), and in any case, our return value is ignored
	155	* by pnp_bus_suspend(). Hence we don't revert the wakeup
	156	* setting if the set_power fails.
	157	*/
e70dba60	158	error = acpi_device_set_power(acpi_dev, power_state);
b14e033e	159	}
cc8e7a35 RW	160
cc8e7a35 RW	161	return error;
fc30e68e SL	162	}
	163
	164	static int pnpacpi_resume(struct pnp_dev *dev)
	165	{
e70dba60	166	struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
cc8e7a35 RW	167	int error = 0;
cc8e7a35 RW	168
e70dba60	169	if (!acpi_dev) {
cc8e7a35 RW	170	dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
	171	return -ENODEV;
	172	}
c4da6940	173
b14e033e	174	if (device_may_wakeup(&dev->dev))
4d183d04	175	acpi_pm_set_device_wakeup(&dev->dev, false);
cc8e7a35	176
e70dba60 RW	177	if (acpi_device_power_manageable(acpi_dev))
e70dba60 RW	178	error = acpi_device_set_power(acpi_dev, ACPI_STATE_D0);
cc8e7a35 RW	179
cc8e7a35 RW	180	return error;
fc30e68e	181	}
673d5b43	182	#endif
fc30e68e	183
9065ce45	184	struct pnp_protocol pnpacpi_protocol = {
07d4e9af BH	185	.name = "Plug and Play ACPI",
	186	.get = pnpacpi_get_resources,
	187	.set = pnpacpi_set_resources,
1da177e4	188	.disable = pnpacpi_disable_resources,
673d5b43	189	#ifdef CONFIG_ACPI_SLEEP
b14e033e	190	.can_wakeup = pnpacpi_can_wakeup,
fc30e68e SL	191	.suspend = pnpacpi_suspend,
fc30e68e SL	192	.resume = pnpacpi_resume,
673d5b43	193	#endif
1da177e4	194	};
9065ce45	195	EXPORT_SYMBOL(pnpacpi_protocol);
1da177e4	196
844142c3	197	static const char __init pnpacpi_get_id(struct acpi_device device)
420a0f66 DT	198	{
	199	struct acpi_hardware_id *id;
	200
	201	list_for_each_entry(id, &device->pnp.ids, list) {
	202	if (ispnpidacpi(id->id))
	203	return id->id;
	204	}
	205
	206	return NULL;
	207	}
	208
1da177e4 LT	209	static int __init pnpacpi_add_device(struct acpi_device *device)
1da177e4 LT	210	{
1da177e4	211	struct pnp_dev *dev;
844142c3	212	const char *pnpid;
7f47fa6c	213	struct acpi_hardware_id *id;
249135d1	214	int error;
1da177e4	215
29058753 AH	216	/* Skip devices that are already bound */
	217	if (device->physical_node_count)
	218	return 0;
	219
39a0ad87 ZY	220	/*
	221	* If a PnPacpi device is not present , the device
	222	* driver should not be loaded.
	223	*/
0e77e2c4	224	if (!acpi_has_method(device->handle, "_CRS"))
420a0f66 DT	225	return 0;
	226
	227	pnpid = pnpacpi_get_id(device);
	228	if (!pnpid)
	229	return 0;
	230
eec15edb	231	if (!device->status.present)
1da177e4 LT	232	return 0;
1da177e4 LT	233
420a0f66	234	dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
bda1e4e5	235	if (!dev)
1da177e4	236	return -ENOMEM;
bda1e4e5	237
2eb1eb02	238	ACPI_COMPANION_SET(&dev->dev, device);
c4da6940	239	dev->data = device;
07d4e9af	240	/* .enabled means the device can decode the resources */
1da177e4	241	dev->active = device->status.enabled;
0e77e2c4	242	if (acpi_has_method(device->handle, "_SRS"))
1da177e4 LT	243	dev->capabilities \|= PNP_CONFIGURABLE;
1da177e4 LT	244	dev->capabilities \|= PNP_READ;
856608ee	245	if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
1da177e4 LT	246	dev->capabilities \|= PNP_WRITE;
	247	if (device->flags.removable)
	248	dev->capabilities \|= PNP_REMOVABLE;
0e77e2c4	249	if (acpi_has_method(device->handle, "_DIS"))
1da177e4 LT	250	dev->capabilities \|= PNP_DISABLE;
1da177e4 LT	251
1da177e4 LT	252	if (strlen(acpi_device_name(device)))
	253	strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
	254	else
	255	strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
	256
d152cf5d BH	257	if (dev->active)
d152cf5d BH	258	pnpacpi_parse_allocated_resource(dev);
1da177e4	259
d152cf5d BH	260	if (dev->capabilities & PNP_CONFIGURABLE)
d152cf5d BH	261	pnpacpi_parse_resource_option_data(dev);
55955aad	262
7f47fa6c	263	list_for_each_entry(id, &device->pnp.ids, list) {
420a0f66	264	if (!strcmp(id->id, pnpid))
7f47fa6c BH	265	continue;
	266	if (!ispnpidacpi(id->id))
	267	continue;
	268	pnp_add_id(dev, id->id);
1da177e4 LT	269	}
	270
	271	/* clear out the damaged flags */
	272	if (!dev->active)
f4490002	273	pnp_init_resources(dev);
249135d1 DT	274
	275	error = pnp_add_device(dev);
	276	if (error) {
	277	put_device(&dev->dev);
	278	return error;
	279	}
	280
9dd78466	281	num++;
1da177e4	282
2eb1eb02	283	return 0;
1da177e4 LT	284	}
	285
	286	static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
9dd78466 BH	287	u32 lvl, void *context,
9dd78466 BH	288	void **rv)
1da177e4 LT	289	{
	290	struct acpi_device *device;
	291
eec15edb	292	if (acpi_bus_get_device(handle, &device))
1da177e4	293	return AE_CTRL_DEPTH;
eec15edb ZR	294	if (acpi_is_pnp_device(device))
eec15edb ZR	295	pnpacpi_add_device(device);
1da177e4 LT	296	return AE_OK;
	297	}
	298
	299	int pnpacpi_disabled __initdata;
b449f63c	300	static int __init pnpacpi_init(void)
1da177e4 LT	301	{
1da177e4 LT	302	if (acpi_disabled \|\| pnpacpi_disabled) {
c865d2f6	303	printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
1da177e4 LT	304	return 0;
1da177e4 LT	305	}
c865d2f6	306	printk(KERN_INFO "pnp: PnP ACPI init\n");
1da177e4 LT	307	pnp_register_protocol(&pnpacpi_protocol);
1da177e4 LT	308	acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
c865d2f6	309	printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
8f81dd14	310	pnp_platform_devices = 1;
1da177e4 LT	311	return 0;
1da177e4 LT	312	}
9dd78466	313
ed458df4	314	fs_initcall(pnpacpi_init);
1da177e4 LT	315
	316	static int __init pnpacpi_setup(char *str)
	317	{
	318	if (str == NULL)
	319	return 1;
	320	if (!strncmp(str, "off", 3))
	321	pnpacpi_disabled = 1;
	322	return 1;
	323	}
9dd78466	324
1da177e4	325	__setup("pnpacpi=", pnpacpi_setup);