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 <acpi/acpi_bus.h>
33 #include <acpi/acpi_drivers.h>
35 #define PREFIX "ACPI: "
37 #define ACPI_FAN_CLASS "fan"
38 #define ACPI_FAN_FILE_STATE "state"
40 #define _COMPONENT ACPI_FAN_COMPONENT
41 ACPI_MODULE_NAME("fan");
43 MODULE_AUTHOR("Paul Diefenbaugh");
44 MODULE_DESCRIPTION("ACPI Fan Driver");
45 MODULE_LICENSE("GPL");
47 static int acpi_fan_add(struct acpi_device *device);
48 static int acpi_fan_remove(struct acpi_device *device, int type);
49 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
50 static int acpi_fan_resume(struct acpi_device *device);
52 static const struct acpi_device_id fan_device_ids[] = {
56 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
58 static struct acpi_driver acpi_fan_driver = {
60 .class = ACPI_FAN_CLASS,
61 .ids = fan_device_ids,
64 .remove = acpi_fan_remove,
65 .suspend = acpi_fan_suspend,
66 .resume = acpi_fan_resume,
70 /* thermal cooling device callbacks */
71 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
74 /* ACPI fan device only support two states: ON/OFF */
79 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
82 struct acpi_device *device = cdev->devdata;
89 result = acpi_bus_get_power(device->handle, &acpi_state);
93 *state = (acpi_state == ACPI_STATE_D3 ? 0 :
94 (acpi_state == ACPI_STATE_D0 ? 1 : -1));
99 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
101 struct acpi_device *device = cdev->devdata;
104 if (!device || (state != 0 && state != 1))
107 result = acpi_bus_set_power(device->handle,
108 state ? ACPI_STATE_D0 : ACPI_STATE_D3);
113 static struct thermal_cooling_device_ops fan_cooling_ops = {
114 .get_max_state = fan_get_max_state,
115 .get_cur_state = fan_get_cur_state,
116 .set_cur_state = fan_set_cur_state,
119 /* --------------------------------------------------------------------------
121 -------------------------------------------------------------------------- */
123 static int acpi_fan_add(struct acpi_device *device)
127 struct thermal_cooling_device *cdev;
132 strcpy(acpi_device_name(device), "Fan");
133 strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
135 result = acpi_bus_get_power(device->handle, &state);
137 printk(KERN_ERR PREFIX "Reading power state\n");
141 device->flags.force_power_state = 1;
142 acpi_bus_set_power(device->handle, state);
143 device->flags.force_power_state = 0;
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, int type)
179 struct thermal_cooling_device *cdev = acpi_driver_data(device);
181 if (!device || !cdev)
184 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
185 sysfs_remove_link(&cdev->device.kobj, "device");
186 thermal_cooling_device_unregister(cdev);
191 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
196 acpi_bus_set_power(device->handle, ACPI_STATE_D0);
201 static int acpi_fan_resume(struct acpi_device *device)
209 result = acpi_bus_get_power(device->handle, &power_state);
211 printk(KERN_ERR PREFIX
212 "Error reading fan power state\n");
216 device->flags.force_power_state = 1;
217 acpi_bus_set_power(device->handle, power_state);
218 device->flags.force_power_state = 0;
223 static int __init acpi_fan_init(void)
227 result = acpi_bus_register_driver(&acpi_fan_driver);
234 static void __exit acpi_fan_exit(void)
237 acpi_bus_unregister_driver(&acpi_fan_driver);
242 module_init(acpi_fan_init);
243 module_exit(acpi_fan_exit);