2 * acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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>
34 #define PREFIX "ACPI: "
36 #define ACPI_FAN_CLASS "fan"
37 #define ACPI_FAN_FILE_STATE "state"
39 #define _COMPONENT ACPI_FAN_COMPONENT
40 ACPI_MODULE_NAME("fan");
42 MODULE_AUTHOR("Paul Diefenbaugh");
43 MODULE_DESCRIPTION("ACPI Fan Driver");
44 MODULE_LICENSE("GPL");
46 static int acpi_fan_add(struct acpi_device *device);
47 static int acpi_fan_remove(struct acpi_device *device);
49 static const struct acpi_device_id fan_device_ids[] = {
53 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
55 #ifdef CONFIG_PM_SLEEP
56 static int acpi_fan_suspend(struct device *dev);
57 static int acpi_fan_resume(struct device *dev);
59 #define acpi_fan_suspend NULL
60 #define acpi_fan_resume NULL
62 static SIMPLE_DEV_PM_OPS(acpi_fan_pm, acpi_fan_suspend, acpi_fan_resume);
64 static struct acpi_driver acpi_fan_driver = {
66 .class = ACPI_FAN_CLASS,
67 .ids = fan_device_ids,
70 .remove = acpi_fan_remove,
72 .drv.pm = &acpi_fan_pm,
75 /* thermal cooling device callbacks */
76 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
79 /* ACPI fan device only support two states: ON/OFF */
84 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
87 struct acpi_device *device = cdev->devdata;
89 int acpi_state = ACPI_STATE_D0;
94 result = acpi_bus_update_power(device->handle, &acpi_state);
98 *state = (acpi_state == ACPI_STATE_D3_COLD ? 0 :
99 (acpi_state == ACPI_STATE_D0 ? 1 : -1));
104 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
106 struct acpi_device *device = cdev->devdata;
109 if (!device || (state != 0 && state != 1))
112 result = acpi_bus_set_power(device->handle,
113 state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
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,
124 /* --------------------------------------------------------------------------
126 -------------------------------------------------------------------------- */
128 static int acpi_fan_add(struct acpi_device *device)
131 struct thermal_cooling_device *cdev;
136 strcpy(acpi_device_name(device), "Fan");
137 strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
139 result = acpi_bus_update_power(device->handle, NULL);
141 printk(KERN_ERR PREFIX "Setting initial power state\n");
145 cdev = thermal_cooling_device_register("Fan", device,
148 result = PTR_ERR(cdev);
152 dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
154 device->driver_data = cdev;
155 result = sysfs_create_link(&device->dev.kobj,
159 dev_err(&device->dev, "Failed to create sysfs link "
160 "'thermal_cooling'\n");
162 result = sysfs_create_link(&cdev->device.kobj,
166 dev_err(&device->dev, "Failed to create sysfs link "
169 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
170 acpi_device_name(device), acpi_device_bid(device),
171 !device->power.state ? "on" : "off");
177 static int acpi_fan_remove(struct acpi_device *device)
179 struct thermal_cooling_device *cdev;
184 cdev = acpi_driver_data(device);
188 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
189 sysfs_remove_link(&cdev->device.kobj, "device");
190 thermal_cooling_device_unregister(cdev);
195 #ifdef CONFIG_PM_SLEEP
196 static int acpi_fan_suspend(struct device *dev)
201 acpi_bus_set_power(to_acpi_device(dev)->handle, ACPI_STATE_D0);
206 static int acpi_fan_resume(struct device *dev)
213 result = acpi_bus_update_power(to_acpi_device(dev)->handle, NULL);
215 printk(KERN_ERR PREFIX "Error updating fan power state\n");
221 module_acpi_driver(acpi_fan_driver);