[linux-block.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 <asm/uaccess.h>
#include <linux/thermal.h>
#include <linux/acpi.h>

#define PREFIX "ACPI: "

#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);

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

#ifdef CONFIG_PM_SLEEP
static int acpi_fan_suspend(struct device *dev);
static int acpi_fan_resume(struct device *dev);
#else
#define acpi_fan_suspend NULL
#define acpi_fan_resume NULL
#endif
static SIMPLE_DEV_PM_OPS(acpi_fan_pm, acpi_fan_suspend, acpi_fan_resume);

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,
		},
	.drv.pm = &acpi_fan_pm,
};

/* thermal cooling device callbacks */
static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
			     *state)
{
	/* ACPI fan device only support two states: ON/OFF */
	*state = 1;
	return 0;
}

static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
			     *state)
{
	struct acpi_device *device = cdev->devdata;
	int result;
	int acpi_state = ACPI_STATE_D0;

	if (!device)
		return -EINVAL;

	result = acpi_bus_update_power(device->handle, &acpi_state);
	if (result)
		return result;

	*state = (acpi_state == ACPI_STATE_D3_COLD ? 0 :
		 (acpi_state == ACPI_STATE_D0 ? 1 : -1));
	return 0;
}

static int
fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long 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_COLD);

	return result;
}

static const 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,
};

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

static int acpi_fan_add(struct acpi_device *device)
{
	int result = 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_update_power(device->handle, NULL);
	if (result) {
		printk(KERN_ERR PREFIX "Setting initial power state\n");
		goto end;
	}

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

	dev_dbg(&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");

	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)
{
	struct thermal_cooling_device *cdev;

	if (!device)
		return -EINVAL;

	cdev =  acpi_driver_data(device);
	if (!cdev)
		return -EINVAL;

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

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int acpi_fan_suspend(struct device *dev)
{
	if (!dev)
		return -EINVAL;

	acpi_bus_set_power(to_acpi_device(dev)->handle, ACPI_STATE_D0);

	return AE_OK;
}

static int acpi_fan_resume(struct device *dev)
{
	int result;

	if (!dev)
		return -EINVAL;

	result = acpi_bus_update_power(to_acpi_device(dev)->handle, NULL);
	if (result)
		printk(KERN_ERR PREFIX "Error updating fan power state\n");

	return result;
}
#endif

module_acpi_driver(acpi_fan_driver);
Commit	Line	Data
	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 <asm/uaccess.h>
	31	#include <linux/thermal.h>
	32	#include <linux/acpi.h>
	33
	34	#define PREFIX "ACPI: "
	35
	36	#define ACPI_FAN_CLASS "fan"
	37	#define ACPI_FAN_FILE_STATE "state"
	38
	39	#define _COMPONENT ACPI_FAN_COMPONENT
	40	ACPI_MODULE_NAME("fan");
	41
	42	MODULE_AUTHOR("Paul Diefenbaugh");
	43	MODULE_DESCRIPTION("ACPI Fan Driver");
	44	MODULE_LICENSE("GPL");
	45
	46	static int acpi_fan_add(struct acpi_device *device);
	47	static int acpi_fan_remove(struct acpi_device *device);
	48
	49	static const struct acpi_device_id fan_device_ids[] = {
	50	{"PNP0C0B", 0},
	51	{"", 0},
	52	};
	53	MODULE_DEVICE_TABLE(acpi, fan_device_ids);
	54
	55	#ifdef CONFIG_PM_SLEEP
	56	static int acpi_fan_suspend(struct device *dev);
	57	static int acpi_fan_resume(struct device *dev);
	58	#else
	59	#define acpi_fan_suspend NULL
	60	#define acpi_fan_resume NULL
	61	#endif
	62	static SIMPLE_DEV_PM_OPS(acpi_fan_pm, acpi_fan_suspend, acpi_fan_resume);
	63
	64	static struct acpi_driver acpi_fan_driver = {
	65	.name = "fan",
	66	.class = ACPI_FAN_CLASS,
	67	.ids = fan_device_ids,
	68	.ops = {
	69	.add = acpi_fan_add,
	70	.remove = acpi_fan_remove,
	71	},
	72	.drv.pm = &acpi_fan_pm,
	73	};
	74
	75	/* thermal cooling device callbacks */
	76	static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
	77	*state)
	78	{
	79	/* ACPI fan device only support two states: ON/OFF */
	80	*state = 1;
	81	return 0;
	82	}
	83
	84	static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
	85	*state)
	86	{
	87	struct acpi_device *device = cdev->devdata;
	88	int result;
	89	int acpi_state = ACPI_STATE_D0;
	90
	91	if (!device)
	92	return -EINVAL;
	93
	94	result = acpi_bus_update_power(device->handle, &acpi_state);
	95	if (result)
	96	return result;
	97
	98	*state = (acpi_state == ACPI_STATE_D3_COLD ? 0 :
	99	(acpi_state == ACPI_STATE_D0 ? 1 : -1));
	100	return 0;
	101	}
	102
	103	static int
	104	fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
	105	{
	106	struct acpi_device *device = cdev->devdata;
	107	int result;
	108
	109	if (!device \|\| (state != 0 && state != 1))
	110	return -EINVAL;
	111
	112	result = acpi_bus_set_power(device->handle,
	113	state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
	114
	115	return result;
	116	}
	117
	118	static const struct thermal_cooling_device_ops fan_cooling_ops = {
	119	.get_max_state = fan_get_max_state,
	120	.get_cur_state = fan_get_cur_state,
	121	.set_cur_state = fan_set_cur_state,
	122	};
	123
	124	/* --------------------------------------------------------------------------
	125	Driver Interface
	126	-------------------------------------------------------------------------- */
	127
	128	static int acpi_fan_add(struct acpi_device *device)
	129	{
	130	int result = 0;
	131	struct thermal_cooling_device *cdev;
	132
	133	if (!device)
	134	return -EINVAL;
	135
	136	strcpy(acpi_device_name(device), "Fan");
	137	strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
	138
	139	result = acpi_bus_update_power(device->handle, NULL);
	140	if (result) {
	141	printk(KERN_ERR PREFIX "Setting initial power state\n");
	142	goto end;
	143	}
	144
	145	cdev = thermal_cooling_device_register("Fan", device,
	146	&fan_cooling_ops);
	147	if (IS_ERR(cdev)) {
	148	result = PTR_ERR(cdev);
	149	goto end;
	150	}
	151
	152	dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
	153
	154	device->driver_data = cdev;
	155	result = sysfs_create_link(&device->dev.kobj,
	156	&cdev->device.kobj,
	157	"thermal_cooling");
	158	if (result)
	159	dev_err(&device->dev, "Failed to create sysfs link "
	160	"'thermal_cooling'\n");
	161
	162	result = sysfs_create_link(&cdev->device.kobj,
	163	&device->dev.kobj,
	164	"device");
	165	if (result)
	166	dev_err(&device->dev, "Failed to create sysfs link "
	167	"'device'\n");
	168
	169	printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
	170	acpi_device_name(device), acpi_device_bid(device),
	171	!device->power.state ? "on" : "off");
	172
	173	end:
	174	return result;
	175	}
	176
	177	static int acpi_fan_remove(struct acpi_device *device)
	178	{
	179	struct thermal_cooling_device *cdev;
	180
	181	if (!device)
	182	return -EINVAL;
	183
	184	cdev = acpi_driver_data(device);
	185	if (!cdev)
	186	return -EINVAL;
	187
	188	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
	189	sysfs_remove_link(&cdev->device.kobj, "device");
	190	thermal_cooling_device_unregister(cdev);
	191
	192	return 0;
	193	}
	194
	195	#ifdef CONFIG_PM_SLEEP
	196	static int acpi_fan_suspend(struct device *dev)
	197	{
	198	if (!dev)
	199	return -EINVAL;
	200
	201	acpi_bus_set_power(to_acpi_device(dev)->handle, ACPI_STATE_D0);
	202
	203	return AE_OK;
	204	}
	205
	206	static int acpi_fan_resume(struct device *dev)
	207	{
	208	int result;
	209
	210	if (!dev)
	211	return -EINVAL;
	212
	213	result = acpi_bus_update_power(to_acpi_device(dev)->handle, NULL);
	214	if (result)
	215	printk(KERN_ERR PREFIX "Error updating fan power state\n");
	216
	217	return result;
	218	}
	219	#endif
	220
	221	module_acpi_driver(acpi_fan_driver);