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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 <acpi/acpi_bus.h>
33#include <acpi/acpi_drivers.h>
34
35#define PREFIX "ACPI: "
36
37#define ACPI_FAN_CLASS "fan"
38#define ACPI_FAN_FILE_STATE "state"
39
40#define _COMPONENT ACPI_FAN_COMPONENT
41ACPI_MODULE_NAME("fan");
42
43MODULE_AUTHOR("Paul Diefenbaugh");
44MODULE_DESCRIPTION("ACPI Fan Driver");
45MODULE_LICENSE("GPL");
46
47static int acpi_fan_add(struct acpi_device *device);
48static int acpi_fan_remove(struct acpi_device *device, int type);
49
50static const struct acpi_device_id fan_device_ids[] = {
51 {"PNP0C0B", 0},
52 {"", 0},
53};
54MODULE_DEVICE_TABLE(acpi, fan_device_ids);
55
56#ifdef CONFIG_PM_SLEEP
57static int acpi_fan_suspend(struct device *dev);
58static int acpi_fan_resume(struct device *dev);
59#endif
60static SIMPLE_DEV_PM_OPS(acpi_fan_pm, acpi_fan_suspend, acpi_fan_resume);
61
62static struct acpi_driver acpi_fan_driver = {
63 .name = "fan",
64 .class = ACPI_FAN_CLASS,
65 .ids = fan_device_ids,
66 .ops = {
67 .add = acpi_fan_add,
68 .remove = acpi_fan_remove,
69 },
70 .drv.pm = &acpi_fan_pm,
71};
72
73/* thermal cooling device callbacks */
74static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
75 *state)
76{
77 /* ACPI fan device only support two states: ON/OFF */
78 *state = 1;
79 return 0;
80}
81
82static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
83 *state)
84{
85 struct acpi_device *device = cdev->devdata;
86 int result;
87 int acpi_state;
88
89 if (!device)
90 return -EINVAL;
91
92 result = acpi_bus_update_power(device->handle, &acpi_state);
93 if (result)
94 return result;
95
96 *state = (acpi_state == ACPI_STATE_D3 ? 0 :
97 (acpi_state == ACPI_STATE_D0 ? 1 : -1));
98 return 0;
99}
100
101static int
102fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
103{
104 struct acpi_device *device = cdev->devdata;
105 int result;
106
107 if (!device || (state != 0 && state != 1))
108 return -EINVAL;
109
110 result = acpi_bus_set_power(device->handle,
111 state ? ACPI_STATE_D0 : ACPI_STATE_D3);
112
113 return result;
114}
115
116static const struct thermal_cooling_device_ops fan_cooling_ops = {
117 .get_max_state = fan_get_max_state,
118 .get_cur_state = fan_get_cur_state,
119 .set_cur_state = fan_set_cur_state,
120};
121
122/* --------------------------------------------------------------------------
123 Driver Interface
124 -------------------------------------------------------------------------- */
125
126static int acpi_fan_add(struct acpi_device *device)
127{
128 int result = 0;
129 struct thermal_cooling_device *cdev;
130
131 if (!device)
132 return -EINVAL;
133
134 strcpy(acpi_device_name(device), "Fan");
135 strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
136
137 result = acpi_bus_update_power(device->handle, NULL);
138 if (result) {
139 printk(KERN_ERR PREFIX "Setting initial power state\n");
140 goto end;
141 }
142
143 cdev = thermal_cooling_device_register("Fan", device,
144 &fan_cooling_ops);
145 if (IS_ERR(cdev)) {
146 result = PTR_ERR(cdev);
147 goto end;
148 }
149
150 dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
151
152 device->driver_data = cdev;
153 result = sysfs_create_link(&device->dev.kobj,
154 &cdev->device.kobj,
155 "thermal_cooling");
156 if (result)
157 dev_err(&device->dev, "Failed to create sysfs link "
158 "'thermal_cooling'\n");
159
160 result = sysfs_create_link(&cdev->device.kobj,
161 &device->dev.kobj,
162 "device");
163 if (result)
164 dev_err(&device->dev, "Failed to create sysfs link "
165 "'device'\n");
166
167 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
168 acpi_device_name(device), acpi_device_bid(device),
169 !device->power.state ? "on" : "off");
170
171 end:
172 return result;
173}
174
175static int acpi_fan_remove(struct acpi_device *device, int type)
176{
177 struct thermal_cooling_device *cdev = acpi_driver_data(device);
178
179 if (!device || !cdev)
180 return -EINVAL;
181
182 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
183 sysfs_remove_link(&cdev->device.kobj, "device");
184 thermal_cooling_device_unregister(cdev);
185
186 return 0;
187}
188
189#ifdef CONFIG_PM_SLEEP
190static int acpi_fan_suspend(struct device *dev)
191{
192 if (!dev)
193 return -EINVAL;
194
195 acpi_bus_set_power(to_acpi_device(dev)->handle, ACPI_STATE_D0);
196
197 return AE_OK;
198}
199
200static int acpi_fan_resume(struct device *dev)
201{
202 int result;
203
204 if (!dev)
205 return -EINVAL;
206
207 result = acpi_bus_update_power(to_acpi_device(dev)->handle, NULL);
208 if (result)
209 printk(KERN_ERR PREFIX "Error updating fan power state\n");
210
211 return result;
212}
213#endif
214
215module_acpi_driver(acpi_fan_driver);