[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / fan.c

/*
 *  acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
 *
 *  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/seq_file.h>
#include <asm/uaccess.h>
#include <linux/thermal.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define ACPI_FAN_COMPONENT		0x00200000
#define ACPI_FAN_CLASS			"fan"
#define ACPI_FAN_FILE_STATE		"state"

#define _COMPONENT		ACPI_FAN_COMPONENT
ACPI_MODULE_NAME("fan");

MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION("ACPI Fan Driver");
MODULE_LICENSE("GPL");

static int acpi_fan_add(struct acpi_device *device);
static int acpi_fan_remove(struct acpi_device *device, int type);
static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
static int acpi_fan_resume(struct acpi_device *device);

static const struct acpi_device_id fan_device_ids[] = {
	{"PNP0C0B", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, fan_device_ids);

static struct acpi_driver acpi_fan_driver = {
	.name = "fan",
	.class = ACPI_FAN_CLASS,
	.ids = fan_device_ids,
	.ops = {
		.add = acpi_fan_add,
		.remove = acpi_fan_remove,
		.suspend = acpi_fan_suspend,
		.resume = acpi_fan_resume,
		},
};

/* thermal cooling device callbacks */
static int fan_get_max_state(struct thermal_cooling_device *cdev, char *buf)
{
	/* ACPI fan device only support two states: ON/OFF */
	return sprintf(buf, "1\n");
}

static int fan_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
{
	struct acpi_device *device = cdev->devdata;
	int state;
	int result;

	if (!device)
		return -EINVAL;

	result = acpi_bus_get_power(device->handle, &state);
	if (result)
		return result;

	return sprintf(buf, "%s\n", state == ACPI_STATE_D3 ? "0" :
			 (state == ACPI_STATE_D0 ? "1" : "unknown"));
}

static int
fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
{
	struct acpi_device *device = cdev->devdata;
	int result;

	if (!device || (state != 0 && state != 1))
		return -EINVAL;

	result = acpi_bus_set_power(device->handle,
				state ? ACPI_STATE_D0 : ACPI_STATE_D3);

	return result;
}

static struct thermal_cooling_device_ops fan_cooling_ops = {
	.get_max_state = fan_get_max_state,
	.get_cur_state = fan_get_cur_state,
	.set_cur_state = fan_set_cur_state,
};

/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */
#ifdef CONFIG_ACPI_PROCFS

static struct proc_dir_entry *acpi_fan_dir;

static int acpi_fan_read_state(struct seq_file *seq, void *offset)
{
	struct acpi_device *device = seq->private;
	int state = 0;


	if (device) {
		if (acpi_bus_get_power(device->handle, &state))
			seq_printf(seq, "status:                  ERROR\n");
		else
			seq_printf(seq, "status:                  %s\n",
				   !state ? "on" : "off");
	}
	return 0;
}

static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_fan_read_state, PDE(inode)->data);
}

static ssize_t
acpi_fan_write_state(struct file *file, const char __user * buffer,
		     size_t count, loff_t * ppos)
{
	int result = 0;
	struct seq_file *m = file->private_data;
	struct acpi_device *device = m->private;
	char state_string[3] = { '\0' };

	if (count > sizeof(state_string) - 1)
		return -EINVAL;

	if (copy_from_user(state_string, buffer, count))
		return -EFAULT;

	state_string[count] = '\0';
	if ((state_string[0] < '0') || (state_string[0] > '3'))
		return -EINVAL;
	if (state_string[1] == '\n')
		state_string[1] = '\0';
	if (state_string[1] != '\0')
		return -EINVAL;

	result = acpi_bus_set_power(device->handle,
				    simple_strtoul(state_string, NULL, 0));
	if (result)
		return result;

	return count;
}

static const struct file_operations acpi_fan_state_ops = {
	.open = acpi_fan_state_open_fs,
	.read = seq_read,
	.write = acpi_fan_write_state,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

static int acpi_fan_add_fs(struct acpi_device *device)
{
	struct proc_dir_entry *entry = NULL;


	if (!device)
		return -EINVAL;

	if (!acpi_device_dir(device)) {
		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
						     acpi_fan_dir);
		if (!acpi_device_dir(device))
			return -ENODEV;
		acpi_device_dir(device)->owner = THIS_MODULE;
	}

	/* 'status' [R/W] */
	entry = proc_create_data(ACPI_FAN_FILE_STATE,
				 S_IFREG | S_IRUGO | S_IWUSR,
				 acpi_device_dir(device),
				 &acpi_fan_state_ops,
				 device);
	if (!entry)
		return -ENODEV;
	return 0;
}

static int acpi_fan_remove_fs(struct acpi_device *device)
{

	if (acpi_device_dir(device)) {
		remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
		remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
		acpi_device_dir(device) = NULL;
	}

	return 0;
}
#else
static int acpi_fan_add_fs(struct acpi_device *device)
{
	return 0;
}

static int acpi_fan_remove_fs(struct acpi_device *device)
{
	return 0;
}
#endif
/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */

static int acpi_fan_add(struct acpi_device *device)
{
	int result = 0;
	int state = 0;
	struct thermal_cooling_device *cdev;

	if (!device)
		return -EINVAL;

	strcpy(acpi_device_name(device), "Fan");
	strcpy(acpi_device_class(device), ACPI_FAN_CLASS);

	result = acpi_bus_get_power(device->handle, &state);
	if (result) {
		printk(KERN_ERR PREFIX "Reading power state\n");
		goto end;
	}

	device->flags.force_power_state = 1;
	acpi_bus_set_power(device->handle, state);
	device->flags.force_power_state = 0;

	cdev = thermal_cooling_device_register("Fan", device,
						&fan_cooling_ops);
	if (IS_ERR(cdev)) {
		result = PTR_ERR(cdev);
		goto end;
	}

	dev_info(&device->dev, "registered as cooling_device%d\n", cdev->id);

	device->driver_data = cdev;
	result = sysfs_create_link(&device->dev.kobj,
				   &cdev->device.kobj,
				   "thermal_cooling");
	if (result)
		dev_err(&device->dev, "Failed to create sysfs link "
			"'thermal_cooling'\n");

	result = sysfs_create_link(&cdev->device.kobj,
				   &device->dev.kobj,
				   "device");
	if (result)
		dev_err(&device->dev, "Failed to create sysfs link "
			"'device'\n");

	result = acpi_fan_add_fs(device);
	if (result)
		goto end;

	printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
	       acpi_device_name(device), acpi_device_bid(device),
	       !device->power.state ? "on" : "off");

      end:
	return result;
}

static int acpi_fan_remove(struct acpi_device *device, int type)
{
	struct thermal_cooling_device *cdev = acpi_driver_data(device);

	if (!device || !cdev)
		return -EINVAL;

	acpi_fan_remove_fs(device);
	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
	sysfs_remove_link(&cdev->device.kobj, "device");
	thermal_cooling_device_unregister(cdev);

	return 0;
}

static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
{
	if (!device)
		return -EINVAL;

	acpi_bus_set_power(device->handle, ACPI_STATE_D0);

	return AE_OK;
}

static int acpi_fan_resume(struct acpi_device *device)
{
	int result = 0;
	int power_state = 0;

	if (!device)
		return -EINVAL;

	result = acpi_bus_get_power(device->handle, &power_state);
	if (result) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Error reading fan power state\n"));
		return result;
	}

	device->flags.force_power_state = 1;
	acpi_bus_set_power(device->handle, power_state);
	device->flags.force_power_state = 0;

	return result;
}

static int __init acpi_fan_init(void)
{
	int result = 0;


#ifdef CONFIG_ACPI_PROCFS
	acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
	if (!acpi_fan_dir)
		return -ENODEV;
	acpi_fan_dir->owner = THIS_MODULE;
#endif

	result = acpi_bus_register_driver(&acpi_fan_driver);
	if (result < 0) {
		remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
		return -ENODEV;
	}

	return 0;
}

static void __exit acpi_fan_exit(void)
{

	acpi_bus_unregister_driver(&acpi_fan_driver);

	remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);

	return;
}

module_init(acpi_fan_init);
module_exit(acpi_fan_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
	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/seq_file.h>
	32	#include <asm/uaccess.h>
05a83d97	33	#include <linux/thermal.h>
1da177e4 LT	34	#include <acpi/acpi_bus.h>
	35	#include <acpi/acpi_drivers.h>
	36
1da177e4 LT	37	#define ACPI_FAN_COMPONENT 0x00200000
1da177e4 LT	38	#define ACPI_FAN_CLASS "fan"
1da177e4	39	#define ACPI_FAN_FILE_STATE "state"
1da177e4 LT	40
1da177e4 LT	41	#define _COMPONENT ACPI_FAN_COMPONENT
f52fd66d	42	ACPI_MODULE_NAME("fan");
1da177e4	43
f52fd66d	44	MODULE_AUTHOR("Paul Diefenbaugh");
7cda93e0	45	MODULE_DESCRIPTION("ACPI Fan Driver");
1da177e4 LT	46	MODULE_LICENSE("GPL");
1da177e4 LT	47
4be44fcd LB	48	static int acpi_fan_add(struct acpi_device *device);
4be44fcd LB	49	static int acpi_fan_remove(struct acpi_device *device, int type);
ec68373c LB	50	static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
ec68373c LB	51	static int acpi_fan_resume(struct acpi_device *device);
1da177e4	52
1ba90e3a TR	53	static const struct acpi_device_id fan_device_ids[] = {
	54	{"PNP0C0B", 0},
	55	{"", 0},
	56	};
	57	MODULE_DEVICE_TABLE(acpi, fan_device_ids);
	58
1da177e4	59	static struct acpi_driver acpi_fan_driver = {
c2b6705b	60	.name = "fan",
4be44fcd	61	.class = ACPI_FAN_CLASS,
1ba90e3a	62	.ids = fan_device_ids,
4be44fcd LB	63	.ops = {
	64	.add = acpi_fan_add,
	65	.remove = acpi_fan_remove,
ec68373c LB	66	.suspend = acpi_fan_suspend,
ec68373c LB	67	.resume = acpi_fan_resume,
4be44fcd	68	},
1da177e4 LT	69	};
1da177e4 LT	70
05a83d97 ZR	71	/* thermal cooling device callbacks */
	72	static int fan_get_max_state(struct thermal_cooling_device cdev, char buf)
	73	{
	74	/* ACPI fan device only support two states: ON/OFF */
	75	return sprintf(buf, "1\n");
	76	}
	77
	78	static int fan_get_cur_state(struct thermal_cooling_device cdev, char buf)
	79	{
	80	struct acpi_device *device = cdev->devdata;
	81	int state;
	82	int result;
	83
	84	if (!device)
	85	return -EINVAL;
	86
	87	result = acpi_bus_get_power(device->handle, &state);
	88	if (result)
	89	return result;
	90
	91	return sprintf(buf, "%s\n", state == ACPI_STATE_D3 ? "0" :
	92	(state == ACPI_STATE_D0 ? "1" : "unknown"));
	93	}
	94
	95	static int
	96	fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
	97	{
	98	struct acpi_device *device = cdev->devdata;
	99	int result;
	100
	101	if (!device \|\| (state != 0 && state != 1))
	102	return -EINVAL;
	103
	104	result = acpi_bus_set_power(device->handle,
	105	state ? ACPI_STATE_D0 : ACPI_STATE_D3);
	106
	107	return result;
	108	}
	109
	110	static struct thermal_cooling_device_ops fan_cooling_ops = {
	111	.get_max_state = fan_get_max_state,
	112	.get_cur_state = fan_get_cur_state,
	113	.set_cur_state = fan_set_cur_state,
	114	};
	115
1da177e4 LT	116	/* --------------------------------------------------------------------------
	117	FS Interface (/proc)
	118	-------------------------------------------------------------------------- */
05a83d97	119	#ifdef CONFIG_ACPI_PROCFS
1da177e4	120
4be44fcd	121	static struct proc_dir_entry *acpi_fan_dir;
1da177e4	122
4be44fcd	123	static int acpi_fan_read_state(struct seq_file seq, void offset)
1da177e4	124	{
968fc5dc	125	struct acpi_device *device = seq->private;
4be44fcd	126	int state = 0;
1da177e4	127
1da177e4	128
968fc5dc AS	129	if (device) {
968fc5dc AS	130	if (acpi_bus_get_power(device->handle, &state))
1da177e4 LT	131	seq_printf(seq, "status: ERROR\n");
	132	else
	133	seq_printf(seq, "status: %s\n",
4be44fcd	134	!state ? "on" : "off");
1da177e4	135	}
d550d98d	136	return 0;
1da177e4 LT	137	}
	138
	139	static int acpi_fan_state_open_fs(struct inode inode, struct file file)
	140	{
	141	return single_open(file, acpi_fan_read_state, PDE(inode)->data);
	142	}
	143
	144	static ssize_t
4be44fcd LB	145	acpi_fan_write_state(struct file file, const char __user buffer,
4be44fcd LB	146	size_t count, loff_t * ppos)
1da177e4	147	{
4be44fcd	148	int result = 0;
50dd0969	149	struct seq_file *m = file->private_data;
968fc5dc	150	struct acpi_device *device = m->private;
6594d87e	151	char state_string[3] = { '\0' };
1da177e4	152
968fc5dc	153	if (count > sizeof(state_string) - 1)
d550d98d	154	return -EINVAL;
4be44fcd	155
1da177e4	156	if (copy_from_user(state_string, buffer, count))
d550d98d	157	return -EFAULT;
4be44fcd	158
1da177e4	159	state_string[count] = '\0';
6594d87e YY	160	if ((state_string[0] < '0') \|\| (state_string[0] > '3'))
	161	return -EINVAL;
	162	if (state_string[1] == '\n')
	163	state_string[1] = '\0';
	164	if (state_string[1] != '\0')
	165	return -EINVAL;
4be44fcd	166
968fc5dc	167	result = acpi_bus_set_power(device->handle,
4be44fcd	168	simple_strtoul(state_string, NULL, 0));
1da177e4	169	if (result)
d550d98d	170	return result;
1da177e4	171
d550d98d	172	return count;
1da177e4 LT	173	}
1da177e4 LT	174
d7508032	175	static const struct file_operations acpi_fan_state_ops = {
4be44fcd LB	176	.open = acpi_fan_state_open_fs,
	177	.read = seq_read,
	178	.write = acpi_fan_write_state,
	179	.llseek = seq_lseek,
	180	.release = single_release,
1da177e4 LT	181	.owner = THIS_MODULE,
	182	};
	183
4be44fcd	184	static int acpi_fan_add_fs(struct acpi_device *device)
1da177e4	185	{
4be44fcd	186	struct proc_dir_entry *entry = NULL;
1da177e4	187
1da177e4 LT	188
1da177e4 LT	189	if (!device)
d550d98d	190	return -EINVAL;
1da177e4 LT	191
	192	if (!acpi_device_dir(device)) {
	193	acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
4be44fcd	194	acpi_fan_dir);
1da177e4	195	if (!acpi_device_dir(device))
d550d98d	196	return -ENODEV;
1da177e4 LT	197	acpi_device_dir(device)->owner = THIS_MODULE;
	198	}
	199
	200	/* 'status' [R/W] */
cf7acfab DL	201	entry = proc_create_data(ACPI_FAN_FILE_STATE,
	202	S_IFREG \| S_IRUGO \| S_IWUSR,
	203	acpi_device_dir(device),
	204	&acpi_fan_state_ops,
	205	device);
1da177e4	206	if (!entry)
d550d98d	207	return -ENODEV;
d550d98d	208	return 0;
1da177e4 LT	209	}
1da177e4 LT	210
4be44fcd	211	static int acpi_fan_remove_fs(struct acpi_device *device)
1da177e4	212	{
1da177e4 LT	213
1da177e4 LT	214	if (acpi_device_dir(device)) {
4be44fcd	215	remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
1da177e4 LT	216	remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
	217	acpi_device_dir(device) = NULL;
	218	}
	219
d550d98d	220	return 0;
1da177e4	221	}
05a83d97 ZR	222	#else
	223	static int acpi_fan_add_fs(struct acpi_device *device)
	224	{
	225	return 0;
	226	}
1da177e4	227
05a83d97 ZR	228	static int acpi_fan_remove_fs(struct acpi_device *device)
	229	{
	230	return 0;
	231	}
	232	#endif
1da177e4 LT	233	/* --------------------------------------------------------------------------
	234	Driver Interface
	235	-------------------------------------------------------------------------- */
	236
4be44fcd	237	static int acpi_fan_add(struct acpi_device *device)
1da177e4	238	{
4be44fcd	239	int result = 0;
4be44fcd	240	int state = 0;
05a83d97	241	struct thermal_cooling_device *cdev;
1da177e4 LT	242
1da177e4 LT	243	if (!device)
d550d98d	244	return -EINVAL;
1da177e4	245
c65ade4d	246	strcpy(acpi_device_name(device), "Fan");
1da177e4	247	strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
1da177e4	248
dc8c2b27	249	result = acpi_bus_get_power(device->handle, &state);
1da177e4	250	if (result) {
6468463a	251	printk(KERN_ERR PREFIX "Reading power state\n");
1da177e4 LT	252	goto end;
	253	}
	254
ec68373c LB	255	device->flags.force_power_state = 1;
	256	acpi_bus_set_power(device->handle, state);
	257	device->flags.force_power_state = 0;
	258
05a83d97 ZR	259	cdev = thermal_cooling_device_register("Fan", device,
05a83d97 ZR	260	&fan_cooling_ops);
19b36780 TS	261	if (IS_ERR(cdev)) {
	262	result = PTR_ERR(cdev);
	263	goto end;
	264	}
9030062f	265
fc3a8828	266	dev_info(&device->dev, "registered as cooling_device%d\n", cdev->id);
9030062f	267
db89b4f0	268	device->driver_data = cdev;
9030062f JL	269	result = sysfs_create_link(&device->dev.kobj,
	270	&cdev->device.kobj,
	271	"thermal_cooling");
	272	if (result)
fc3a8828 GKH	273	dev_err(&device->dev, "Failed to create sysfs link "
fc3a8828 GKH	274	"'thermal_cooling'\n");
9030062f JL	275
	276	result = sysfs_create_link(&cdev->device.kobj,
	277	&device->dev.kobj,
	278	"device");
	279	if (result)
fc3a8828 GKH	280	dev_err(&device->dev, "Failed to create sysfs link "
fc3a8828 GKH	281	"'device'\n");
05a83d97	282
1da177e4 LT	283	result = acpi_fan_add_fs(device);
	284	if (result)
	285	goto end;
	286
	287	printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
4be44fcd LB	288	acpi_device_name(device), acpi_device_bid(device),
4be44fcd LB	289	!device->power.state ? "on" : "off");
1da177e4	290
4be44fcd	291	end:
d550d98d	292	return result;
1da177e4 LT	293	}
1da177e4 LT	294
4be44fcd	295	static int acpi_fan_remove(struct acpi_device *device, int type)
1da177e4	296	{
05a83d97 ZR	297	struct thermal_cooling_device *cdev = acpi_driver_data(device);
	298
	299	if (!device \|\| !cdev)
d550d98d	300	return -EINVAL;
1da177e4	301
1da177e4	302	acpi_fan_remove_fs(device);
05a83d97 ZR	303	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
	304	sysfs_remove_link(&cdev->device.kobj, "device");
	305	thermal_cooling_device_unregister(cdev);
1da177e4	306
d550d98d	307	return 0;
1da177e4 LT	308	}
1da177e4 LT	309
ec68373c LB	310	static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
	311	{
	312	if (!device)
	313	return -EINVAL;
	314
	315	acpi_bus_set_power(device->handle, ACPI_STATE_D0);
	316
	317	return AE_OK;
	318	}
	319
	320	static int acpi_fan_resume(struct acpi_device *device)
	321	{
	322	int result = 0;
	323	int power_state = 0;
	324
	325	if (!device)
	326	return -EINVAL;
	327
	328	result = acpi_bus_get_power(device->handle, &power_state);
	329	if (result) {
	330	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	331	"Error reading fan power state\n"));
	332	return result;
	333	}
	334
	335	device->flags.force_power_state = 1;
	336	acpi_bus_set_power(device->handle, power_state);
	337	device->flags.force_power_state = 0;
	338
	339	return result;
	340	}
	341
4be44fcd	342	static int __init acpi_fan_init(void)
1da177e4	343	{
c65ade4d	344	int result = 0;
1da177e4	345
1da177e4	346
3c602840	347	#ifdef CONFIG_ACPI_PROCFS
1da177e4 LT	348	acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
1da177e4 LT	349	if (!acpi_fan_dir)
d550d98d	350	return -ENODEV;
1da177e4	351	acpi_fan_dir->owner = THIS_MODULE;
3c602840	352	#endif
1da177e4 LT	353
	354	result = acpi_bus_register_driver(&acpi_fan_driver);
	355	if (result < 0) {
	356	remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
d550d98d	357	return -ENODEV;
1da177e4 LT	358	}
1da177e4 LT	359
d550d98d	360	return 0;
1da177e4 LT	361	}
1da177e4 LT	362
4be44fcd	363	static void __exit acpi_fan_exit(void)
1da177e4	364	{
1da177e4 LT	365
	366	acpi_bus_unregister_driver(&acpi_fan_driver);
	367
	368	remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
	369
d550d98d	370	return;
1da177e4 LT	371	}
1da177e4 LT	372
1da177e4 LT	373	module_init(acpi_fan_init);
1da177e4 LT	374	module_exit(acpi_fan_exit);