Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / drivers / acpi / fan.c
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
41 ACPI_MODULE_NAME("fan");
42
43 MODULE_AUTHOR("Paul Diefenbaugh");
44 MODULE_DESCRIPTION("ACPI Fan Driver");
45 MODULE_LICENSE("GPL");
46
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);
51
52 static const struct acpi_device_id fan_device_ids[] = {
53         {"PNP0C0B", 0},
54         {"", 0},
55 };
56 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
57
58 static struct acpi_driver acpi_fan_driver = {
59         .name = "fan",
60         .class = ACPI_FAN_CLASS,
61         .ids = fan_device_ids,
62         .ops = {
63                 .add = acpi_fan_add,
64                 .remove = acpi_fan_remove,
65                 .suspend = acpi_fan_suspend,
66                 .resume = acpi_fan_resume,
67                 },
68 };
69
70 /* thermal cooling device callbacks */
71 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
72                              *state)
73 {
74         /* ACPI fan device only support two states: ON/OFF */
75         *state = 1;
76         return 0;
77 }
78
79 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
80                              *state)
81 {
82         struct acpi_device *device = cdev->devdata;
83         int result;
84         int acpi_state;
85
86         if (!device)
87                 return -EINVAL;
88
89         result = acpi_bus_update_power(device->handle, &acpi_state);
90         if (result)
91                 return result;
92
93         *state = (acpi_state == ACPI_STATE_D3 ? 0 :
94                  (acpi_state == ACPI_STATE_D0 ? 1 : -1));
95         return 0;
96 }
97
98 static int
99 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
100 {
101         struct acpi_device *device = cdev->devdata;
102         int result;
103
104         if (!device || (state != 0 && state != 1))
105                 return -EINVAL;
106
107         result = acpi_bus_set_power(device->handle,
108                                 state ? ACPI_STATE_D0 : ACPI_STATE_D3);
109
110         return result;
111 }
112
113 static const 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,
117 };
118
119 /* --------------------------------------------------------------------------
120                                  Driver Interface
121    -------------------------------------------------------------------------- */
122
123 static int acpi_fan_add(struct acpi_device *device)
124 {
125         int result = 0;
126         struct thermal_cooling_device *cdev;
127
128         if (!device)
129                 return -EINVAL;
130
131         strcpy(acpi_device_name(device), "Fan");
132         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
133
134         result = acpi_bus_update_power(device->handle, NULL);
135         if (result) {
136                 printk(KERN_ERR PREFIX "Setting initial power state\n");
137                 goto end;
138         }
139
140         cdev = thermal_cooling_device_register("Fan", device,
141                                                 &fan_cooling_ops);
142         if (IS_ERR(cdev)) {
143                 result = PTR_ERR(cdev);
144                 goto end;
145         }
146
147         dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
148
149         device->driver_data = cdev;
150         result = sysfs_create_link(&device->dev.kobj,
151                                    &cdev->device.kobj,
152                                    "thermal_cooling");
153         if (result)
154                 dev_err(&device->dev, "Failed to create sysfs link "
155                         "'thermal_cooling'\n");
156
157         result = sysfs_create_link(&cdev->device.kobj,
158                                    &device->dev.kobj,
159                                    "device");
160         if (result)
161                 dev_err(&device->dev, "Failed to create sysfs link "
162                         "'device'\n");
163
164         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
165                acpi_device_name(device), acpi_device_bid(device),
166                !device->power.state ? "on" : "off");
167
168       end:
169         return result;
170 }
171
172 static int acpi_fan_remove(struct acpi_device *device, int type)
173 {
174         struct thermal_cooling_device *cdev = acpi_driver_data(device);
175
176         if (!device || !cdev)
177                 return -EINVAL;
178
179         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
180         sysfs_remove_link(&cdev->device.kobj, "device");
181         thermal_cooling_device_unregister(cdev);
182
183         return 0;
184 }
185
186 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
187 {
188         if (!device)
189                 return -EINVAL;
190
191         acpi_bus_set_power(device->handle, ACPI_STATE_D0);
192
193         return AE_OK;
194 }
195
196 static int acpi_fan_resume(struct acpi_device *device)
197 {
198         int result;
199
200         if (!device)
201                 return -EINVAL;
202
203         result = acpi_bus_update_power(device->handle, NULL);
204         if (result)
205                 printk(KERN_ERR PREFIX "Error updating fan power state\n");
206
207         return result;
208 }
209
210 static int __init acpi_fan_init(void)
211 {
212         int result = 0;
213
214         result = acpi_bus_register_driver(&acpi_fan_driver);
215         if (result < 0)
216                 return -ENODEV;
217
218         return 0;
219 }
220
221 static void __exit acpi_fan_exit(void)
222 {
223
224         acpi_bus_unregister_driver(&acpi_fan_driver);
225
226         return;
227 }
228
229 module_init(acpi_fan_init);
230 module_exit(acpi_fan_exit);