[deliverable/linux.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 <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define ACPI_FAN_COMPONENT		0x00200000
#define ACPI_FAN_CLASS			"fan"
#define ACPI_FAN_DRIVER_NAME		"ACPI Fan Driver"
#define ACPI_FAN_FILE_STATE		"state"

#define _COMPONENT		ACPI_FAN_COMPONENT
ACPI_MODULE_NAME("acpi_fan")

    MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION(ACPI_FAN_DRIVER_NAME);
MODULE_LICENSE("GPL");

static int acpi_fan_add(struct acpi_device *device);
static int acpi_fan_remove(struct acpi_device *device, int type);

static struct acpi_driver acpi_fan_driver = {
	.name = ACPI_FAN_DRIVER_NAME,
	.class = ACPI_FAN_CLASS,
	.ids = "PNP0C0B",
	.ops = {
		.add = acpi_fan_add,
		.remove = acpi_fan_remove,
		},
};

struct acpi_fan {
	acpi_handle handle;
};

/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

static struct proc_dir_entry *acpi_fan_dir;

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

	ACPI_FUNCTION_TRACE("acpi_fan_read_state");

	if (fan) {
		if (acpi_bus_get_power(fan->handle, &state))
			seq_printf(seq, "status:                  ERROR\n");
		else
			seq_printf(seq, "status:                  %s\n",
				   !state ? "on" : "off");
	}
	return_VALUE(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 = (struct seq_file *)file->private_data;
	struct acpi_fan *fan = (struct acpi_fan *)m->private;
	char state_string[12] = { '\0' };

	ACPI_FUNCTION_TRACE("acpi_fan_write_state");

	if (!fan || (count > sizeof(state_string) - 1))
		return_VALUE(-EINVAL);

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

	state_string[count] = '\0';

	result = acpi_bus_set_power(fan->handle,
				    simple_strtoul(state_string, NULL, 0));
	if (result)
		return_VALUE(result);

	return_VALUE(count);
}

static 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;

	ACPI_FUNCTION_TRACE("acpi_fan_add_fs");

	if (!device)
		return_VALUE(-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_VALUE(-ENODEV);
		acpi_device_dir(device)->owner = THIS_MODULE;
	}

	/* 'status' [R/W] */
	entry = create_proc_entry(ACPI_FAN_FILE_STATE,
				  S_IFREG | S_IRUGO | S_IWUSR,
				  acpi_device_dir(device));
	if (!entry)
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Unable to create '%s' fs entry\n",
				  ACPI_FAN_FILE_STATE));
	else {
		entry->proc_fops = &acpi_fan_state_ops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	return_VALUE(0);
}

static int acpi_fan_remove_fs(struct acpi_device *device)
{
	ACPI_FUNCTION_TRACE("acpi_fan_remove_fs");

	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_VALUE(0);
}

/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */

static int acpi_fan_add(struct acpi_device *device)
{
	int result = 0;
	struct acpi_fan *fan = NULL;
	int state = 0;

	ACPI_FUNCTION_TRACE("acpi_fan_add");

	if (!device)
		return_VALUE(-EINVAL);

	fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL);
	if (!fan)
		return_VALUE(-ENOMEM);
	memset(fan, 0, sizeof(struct acpi_fan));

	fan->handle = device->handle;
	strcpy(acpi_device_name(device), "Fan");
	strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
	acpi_driver_data(device) = fan;

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

	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:
	if (result)
		kfree(fan);

	return_VALUE(result);
}

static int acpi_fan_remove(struct acpi_device *device, int type)
{
	struct acpi_fan *fan = NULL;

	ACPI_FUNCTION_TRACE("acpi_fan_remove");

	if (!device || !acpi_driver_data(device))
		return_VALUE(-EINVAL);

	fan = (struct acpi_fan *)acpi_driver_data(device);

	acpi_fan_remove_fs(device);

	kfree(fan);

	return_VALUE(0);
}

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

	ACPI_FUNCTION_TRACE("acpi_fan_init");

	acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
	if (!acpi_fan_dir)
		return_VALUE(-ENODEV);
	acpi_fan_dir->owner = THIS_MODULE;

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

	return_VALUE(0);
}

static void __exit acpi_fan_exit(void)
{
	ACPI_FUNCTION_TRACE("acpi_fan_exit");

	acpi_bus_unregister_driver(&acpi_fan_driver);

	remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);

	return_VOID;
}

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>
	33
	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_DRIVER_NAME "ACPI Fan Driver"
1da177e4	40	#define ACPI_FAN_FILE_STATE "state"
1da177e4 LT	41
1da177e4 LT	42	#define _COMPONENT ACPI_FAN_COMPONENT
4be44fcd	43	ACPI_MODULE_NAME("acpi_fan")
1da177e4	44
4be44fcd	45	MODULE_AUTHOR("Paul Diefenbaugh");
1da177e4 LT	46	MODULE_DESCRIPTION(ACPI_FAN_DRIVER_NAME);
	47	MODULE_LICENSE("GPL");
	48
4be44fcd LB	49	static int acpi_fan_add(struct acpi_device *device);
4be44fcd LB	50	static int acpi_fan_remove(struct acpi_device *device, int type);
1da177e4 LT	51
1da177e4 LT	52	static struct acpi_driver acpi_fan_driver = {
4be44fcd LB	53	.name = ACPI_FAN_DRIVER_NAME,
	54	.class = ACPI_FAN_CLASS,
	55	.ids = "PNP0C0B",
	56	.ops = {
	57	.add = acpi_fan_add,
	58	.remove = acpi_fan_remove,
	59	},
1da177e4 LT	60	};
	61
	62	struct acpi_fan {
4be44fcd	63	acpi_handle handle;
1da177e4 LT	64	};
1da177e4 LT	65
1da177e4 LT	66	/* --------------------------------------------------------------------------
	67	FS Interface (/proc)
	68	-------------------------------------------------------------------------- */
	69
4be44fcd	70	static struct proc_dir_entry *acpi_fan_dir;
1da177e4	71
4be44fcd	72	static int acpi_fan_read_state(struct seq_file seq, void offset)
1da177e4	73	{
4be44fcd LB	74	struct acpi_fan *fan = seq->private;
4be44fcd LB	75	int state = 0;
1da177e4 LT	76
	77	ACPI_FUNCTION_TRACE("acpi_fan_read_state");
	78
	79	if (fan) {
	80	if (acpi_bus_get_power(fan->handle, &state))
	81	seq_printf(seq, "status: ERROR\n");
	82	else
	83	seq_printf(seq, "status: %s\n",
4be44fcd	84	!state ? "on" : "off");
1da177e4 LT	85	}
	86	return_VALUE(0);
	87	}
	88
	89	static int acpi_fan_state_open_fs(struct inode inode, struct file file)
	90	{
	91	return single_open(file, acpi_fan_read_state, PDE(inode)->data);
	92	}
	93
	94	static ssize_t
4be44fcd LB	95	acpi_fan_write_state(struct file file, const char __user buffer,
4be44fcd LB	96	size_t count, loff_t * ppos)
1da177e4	97	{
4be44fcd LB	98	int result = 0;
	99	struct seq_file m = (struct seq_file )file->private_data;
	100	struct acpi_fan fan = (struct acpi_fan )m->private;
	101	char state_string[12] = { '\0' };
1da177e4 LT	102
	103	ACPI_FUNCTION_TRACE("acpi_fan_write_state");
	104
	105	if (!fan \|\| (count > sizeof(state_string) - 1))
	106	return_VALUE(-EINVAL);
4be44fcd	107
1da177e4 LT	108	if (copy_from_user(state_string, buffer, count))
1da177e4 LT	109	return_VALUE(-EFAULT);
4be44fcd	110
1da177e4	111	state_string[count] = '\0';
4be44fcd LB	112
	113	result = acpi_bus_set_power(fan->handle,
	114	simple_strtoul(state_string, NULL, 0));
1da177e4 LT	115	if (result)
	116	return_VALUE(result);
	117
	118	return_VALUE(count);
	119	}
	120
	121	static struct file_operations acpi_fan_state_ops = {
4be44fcd LB	122	.open = acpi_fan_state_open_fs,
	123	.read = seq_read,
	124	.write = acpi_fan_write_state,
	125	.llseek = seq_lseek,
	126	.release = single_release,
1da177e4 LT	127	.owner = THIS_MODULE,
	128	};
	129
4be44fcd	130	static int acpi_fan_add_fs(struct acpi_device *device)
1da177e4	131	{
4be44fcd	132	struct proc_dir_entry *entry = NULL;
1da177e4 LT	133
	134	ACPI_FUNCTION_TRACE("acpi_fan_add_fs");
	135
	136	if (!device)
	137	return_VALUE(-EINVAL);
	138
	139	if (!acpi_device_dir(device)) {
	140	acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
4be44fcd	141	acpi_fan_dir);
1da177e4 LT	142	if (!acpi_device_dir(device))
	143	return_VALUE(-ENODEV);
	144	acpi_device_dir(device)->owner = THIS_MODULE;
	145	}
	146
	147	/* 'status' [R/W] */
	148	entry = create_proc_entry(ACPI_FAN_FILE_STATE,
4be44fcd LB	149	S_IFREG \| S_IRUGO \| S_IWUSR,
4be44fcd LB	150	acpi_device_dir(device));
1da177e4 LT	151	if (!entry)
1da177e4 LT	152	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
4be44fcd LB	153	"Unable to create '%s' fs entry\n",
4be44fcd LB	154	ACPI_FAN_FILE_STATE));
1da177e4 LT	155	else {
	156	entry->proc_fops = &acpi_fan_state_ops;
	157	entry->data = acpi_driver_data(device);
	158	entry->owner = THIS_MODULE;
	159	}
	160
	161	return_VALUE(0);
	162	}
	163
4be44fcd	164	static int acpi_fan_remove_fs(struct acpi_device *device)
1da177e4 LT	165	{
	166	ACPI_FUNCTION_TRACE("acpi_fan_remove_fs");
	167
	168	if (acpi_device_dir(device)) {
4be44fcd	169	remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
1da177e4 LT	170	remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
	171	acpi_device_dir(device) = NULL;
	172	}
	173
	174	return_VALUE(0);
	175	}
	176
1da177e4 LT	177	/* --------------------------------------------------------------------------
	178	Driver Interface
	179	-------------------------------------------------------------------------- */
	180
4be44fcd	181	static int acpi_fan_add(struct acpi_device *device)
1da177e4	182	{
4be44fcd LB	183	int result = 0;
	184	struct acpi_fan *fan = NULL;
	185	int state = 0;
1da177e4 LT	186
	187	ACPI_FUNCTION_TRACE("acpi_fan_add");
	188
	189	if (!device)
	190	return_VALUE(-EINVAL);
	191
	192	fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL);
	193	if (!fan)
	194	return_VALUE(-ENOMEM);
	195	memset(fan, 0, sizeof(struct acpi_fan));
	196
	197	fan->handle = device->handle;
c65ade4d	198	strcpy(acpi_device_name(device), "Fan");
1da177e4 LT	199	strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
	200	acpi_driver_data(device) = fan;
	201
	202	result = acpi_bus_get_power(fan->handle, &state);
	203	if (result) {
	204	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
4be44fcd	205	"Error reading power state\n"));
1da177e4 LT	206	goto end;
	207	}
	208
	209	result = acpi_fan_add_fs(device);
	210	if (result)
	211	goto end;
	212
	213	printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
4be44fcd LB	214	acpi_device_name(device), acpi_device_bid(device),
4be44fcd LB	215	!device->power.state ? "on" : "off");
1da177e4	216
4be44fcd	217	end:
1da177e4 LT	218	if (result)
	219	kfree(fan);
	220
	221	return_VALUE(result);
	222	}
	223
4be44fcd	224	static int acpi_fan_remove(struct acpi_device *device, int type)
1da177e4	225	{
c65ade4d	226	struct acpi_fan *fan = NULL;
1da177e4 LT	227
	228	ACPI_FUNCTION_TRACE("acpi_fan_remove");
	229
	230	if (!device \|\| !acpi_driver_data(device))
	231	return_VALUE(-EINVAL);
	232
4be44fcd	233	fan = (struct acpi_fan *)acpi_driver_data(device);
1da177e4 LT	234
	235	acpi_fan_remove_fs(device);
	236
	237	kfree(fan);
	238
	239	return_VALUE(0);
	240	}
	241
4be44fcd	242	static int __init acpi_fan_init(void)
1da177e4	243	{
c65ade4d	244	int result = 0;
1da177e4 LT	245
	246	ACPI_FUNCTION_TRACE("acpi_fan_init");
	247
	248	acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
	249	if (!acpi_fan_dir)
	250	return_VALUE(-ENODEV);
	251	acpi_fan_dir->owner = THIS_MODULE;
	252
	253	result = acpi_bus_register_driver(&acpi_fan_driver);
	254	if (result < 0) {
	255	remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
	256	return_VALUE(-ENODEV);
	257	}
	258
	259	return_VALUE(0);
	260	}
	261
4be44fcd	262	static void __exit acpi_fan_exit(void)
1da177e4 LT	263	{
	264	ACPI_FUNCTION_TRACE("acpi_fan_exit");
	265
	266	acpi_bus_unregister_driver(&acpi_fan_driver);
	267
	268	remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
	269
	270	return_VOID;
	271	}
	272
1da177e4 LT	273	module_init(acpi_fan_init);
1da177e4 LT	274	module_exit(acpi_fan_exit);