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 <linux/uaccess.h>
31 #include <linux/thermal.h>
32 #include <linux/acpi.h>
34 #define ACPI_FAN_CLASS "fan"
35 #define ACPI_FAN_FILE_STATE "state"
37 #define _COMPONENT ACPI_FAN_COMPONENT
38 ACPI_MODULE_NAME("fan");
40 MODULE_AUTHOR("Paul Diefenbaugh");
41 MODULE_DESCRIPTION("ACPI Fan Driver");
42 MODULE_LICENSE("GPL");
44 static int acpi_fan_add(struct acpi_device *device);
45 static int acpi_fan_remove(struct acpi_device *device);
47 static const struct acpi_device_id fan_device_ids[] = {
51 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
53 #ifdef CONFIG_PM_SLEEP
54 static int acpi_fan_suspend(struct device *dev);
55 static int acpi_fan_resume(struct device *dev);
56 static struct dev_pm_ops acpi_fan_pm = {
57 .resume = acpi_fan_resume,
58 .freeze = acpi_fan_suspend,
59 .thaw = acpi_fan_resume,
60 .restore = acpi_fan_resume,
62 #define FAN_PM_OPS_PTR (&acpi_fan_pm)
64 #define FAN_PM_OPS_PTR NULL
67 static struct acpi_driver acpi_fan_driver = {
69 .class = ACPI_FAN_CLASS,
70 .ids = fan_device_ids,
73 .remove = acpi_fan_remove,
75 .drv.pm = FAN_PM_OPS_PTR,
78 /* thermal cooling device callbacks */
79 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
82 /* ACPI fan device only support two states: ON/OFF */
87 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
90 struct acpi_device *device = cdev->devdata;
92 int acpi_state = ACPI_STATE_D0;
97 result = acpi_bus_update_power(device->handle, &acpi_state);
101 *state = (acpi_state == ACPI_STATE_D3_COLD ? 0 :
102 (acpi_state == ACPI_STATE_D0 ? 1 : -1));
107 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
109 struct acpi_device *device = cdev->devdata;
112 if (!device || (state != 0 && state != 1))
115 result = acpi_bus_set_power(device->handle,
116 state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
121 static const struct thermal_cooling_device_ops fan_cooling_ops = {
122 .get_max_state = fan_get_max_state,
123 .get_cur_state = fan_get_cur_state,
124 .set_cur_state = fan_set_cur_state,
127 /* --------------------------------------------------------------------------
129 * --------------------------------------------------------------------------
132 static int acpi_fan_add(struct acpi_device *device)
135 struct thermal_cooling_device *cdev;
140 strcpy(acpi_device_name(device), "Fan");
141 strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
143 result = acpi_bus_update_power(device->handle, NULL);
145 dev_err(&device->dev, "Setting initial power state\n");
149 cdev = thermal_cooling_device_register("Fan", device,
152 result = PTR_ERR(cdev);
156 dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
158 device->driver_data = cdev;
159 result = sysfs_create_link(&device->dev.kobj,
163 dev_err(&device->dev, "Failed to create sysfs link "
164 "'thermal_cooling'\n");
166 result = sysfs_create_link(&cdev->device.kobj,
170 dev_err(&device->dev, "Failed to create sysfs link 'device'\n");
172 dev_info(&device->dev, "ACPI: %s [%s] (%s)\n",
173 acpi_device_name(device), acpi_device_bid(device),
174 !device->power.state ? "on" : "off");
180 static int acpi_fan_remove(struct acpi_device *device)
182 struct thermal_cooling_device *cdev;
187 cdev = acpi_driver_data(device);
191 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
192 sysfs_remove_link(&cdev->device.kobj, "device");
193 thermal_cooling_device_unregister(cdev);
198 #ifdef CONFIG_PM_SLEEP
199 static int acpi_fan_suspend(struct device *dev)
204 acpi_bus_set_power(to_acpi_device(dev)->handle, ACPI_STATE_D0);
209 static int acpi_fan_resume(struct device *dev)
216 result = acpi_bus_update_power(to_acpi_device(dev)->handle, NULL);
218 dev_err(dev, "Error updating fan power state\n");
224 module_acpi_driver(acpi_fan_driver);