Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[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 <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <asm/uaccess.h>
33
34 #include <acpi/acpi_bus.h>
35 #include <acpi/acpi_drivers.h>
36
37 #define ACPI_FAN_COMPONENT              0x00200000
38 #define ACPI_FAN_CLASS                  "fan"
39 #define ACPI_FAN_FILE_STATE             "state"
40
41 #define _COMPONENT              ACPI_FAN_COMPONENT
42 ACPI_MODULE_NAME("fan");
43
44 MODULE_AUTHOR("Paul Diefenbaugh");
45 MODULE_DESCRIPTION("ACPI Fan Driver");
46 MODULE_LICENSE("GPL");
47
48 static int acpi_fan_add(struct acpi_device *device);
49 static int acpi_fan_remove(struct acpi_device *device, int type);
50 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
51 static int acpi_fan_resume(struct acpi_device *device);
52
53 static const struct acpi_device_id fan_device_ids[] = {
54         {"PNP0C0B", 0},
55         {"", 0},
56 };
57 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
58
59 static struct acpi_driver acpi_fan_driver = {
60         .name = "fan",
61         .class = ACPI_FAN_CLASS,
62         .ids = fan_device_ids,
63         .ops = {
64                 .add = acpi_fan_add,
65                 .remove = acpi_fan_remove,
66                 .suspend = acpi_fan_suspend,
67                 .resume = acpi_fan_resume,
68                 },
69 };
70
71 /* --------------------------------------------------------------------------
72                               FS Interface (/proc)
73    -------------------------------------------------------------------------- */
74
75 static struct proc_dir_entry *acpi_fan_dir;
76
77 static int acpi_fan_read_state(struct seq_file *seq, void *offset)
78 {
79         struct acpi_device *device = seq->private;
80         int state = 0;
81
82
83         if (device) {
84                 if (acpi_bus_get_power(device->handle, &state))
85                         seq_printf(seq, "status:                  ERROR\n");
86                 else
87                         seq_printf(seq, "status:                  %s\n",
88                                    !state ? "on" : "off");
89         }
90         return 0;
91 }
92
93 static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
94 {
95         return single_open(file, acpi_fan_read_state, PDE(inode)->data);
96 }
97
98 static ssize_t
99 acpi_fan_write_state(struct file *file, const char __user * buffer,
100                      size_t count, loff_t * ppos)
101 {
102         int result = 0;
103         struct seq_file *m = file->private_data;
104         struct acpi_device *device = m->private;
105         char state_string[12] = { '\0' };
106
107         if (count > sizeof(state_string) - 1)
108                 return -EINVAL;
109
110         if (copy_from_user(state_string, buffer, count))
111                 return -EFAULT;
112
113         state_string[count] = '\0';
114
115         result = acpi_bus_set_power(device->handle,
116                                     simple_strtoul(state_string, NULL, 0));
117         if (result)
118                 return result;
119
120         return count;
121 }
122
123 static const struct file_operations acpi_fan_state_ops = {
124         .open = acpi_fan_state_open_fs,
125         .read = seq_read,
126         .write = acpi_fan_write_state,
127         .llseek = seq_lseek,
128         .release = single_release,
129         .owner = THIS_MODULE,
130 };
131
132 static int acpi_fan_add_fs(struct acpi_device *device)
133 {
134         struct proc_dir_entry *entry = NULL;
135
136
137         if (!device)
138                 return -EINVAL;
139
140         if (!acpi_device_dir(device)) {
141                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
142                                                      acpi_fan_dir);
143                 if (!acpi_device_dir(device))
144                         return -ENODEV;
145                 acpi_device_dir(device)->owner = THIS_MODULE;
146         }
147
148         /* 'status' [R/W] */
149         entry = create_proc_entry(ACPI_FAN_FILE_STATE,
150                                   S_IFREG | S_IRUGO | S_IWUSR,
151                                   acpi_device_dir(device));
152         if (!entry)
153                 return -ENODEV;
154         else {
155                 entry->proc_fops = &acpi_fan_state_ops;
156                 entry->data = device;
157                 entry->owner = THIS_MODULE;
158         }
159
160         return 0;
161 }
162
163 static int acpi_fan_remove_fs(struct acpi_device *device)
164 {
165
166         if (acpi_device_dir(device)) {
167                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
168                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
169                 acpi_device_dir(device) = NULL;
170         }
171
172         return 0;
173 }
174
175 /* --------------------------------------------------------------------------
176                                  Driver Interface
177    -------------------------------------------------------------------------- */
178
179 static int acpi_fan_add(struct acpi_device *device)
180 {
181         int result = 0;
182         struct acpi_fan *fan = NULL;
183         int state = 0;
184
185
186         if (!device)
187                 return -EINVAL;
188
189         strcpy(acpi_device_name(device), "Fan");
190         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
191
192         result = acpi_bus_get_power(device->handle, &state);
193         if (result) {
194                 printk(KERN_ERR PREFIX "Reading power state\n");
195                 goto end;
196         }
197
198         device->flags.force_power_state = 1;
199         acpi_bus_set_power(device->handle, state);
200         device->flags.force_power_state = 0;
201
202         result = acpi_fan_add_fs(device);
203         if (result)
204                 goto end;
205
206         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
207                acpi_device_name(device), acpi_device_bid(device),
208                !device->power.state ? "on" : "off");
209
210       end:
211         if (result)
212                 kfree(fan);
213
214         return result;
215 }
216
217 static int acpi_fan_remove(struct acpi_device *device, int type)
218 {
219         if (!device || !acpi_driver_data(device))
220                 return -EINVAL;
221
222         acpi_fan_remove_fs(device);
223
224         return 0;
225 }
226
227 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
228 {
229         if (!device)
230                 return -EINVAL;
231
232         acpi_bus_set_power(device->handle, ACPI_STATE_D0);
233
234         return AE_OK;
235 }
236
237 static int acpi_fan_resume(struct acpi_device *device)
238 {
239         int result = 0;
240         int power_state = 0;
241
242         if (!device)
243                 return -EINVAL;
244
245         result = acpi_bus_get_power(device->handle, &power_state);
246         if (result) {
247                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
248                                   "Error reading fan power state\n"));
249                 return result;
250         }
251
252         device->flags.force_power_state = 1;
253         acpi_bus_set_power(device->handle, power_state);
254         device->flags.force_power_state = 0;
255
256         return result;
257 }
258
259 static int __init acpi_fan_init(void)
260 {
261         int result = 0;
262
263
264         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
265         if (!acpi_fan_dir)
266                 return -ENODEV;
267         acpi_fan_dir->owner = THIS_MODULE;
268
269         result = acpi_bus_register_driver(&acpi_fan_driver);
270         if (result < 0) {
271                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
272                 return -ENODEV;
273         }
274
275         return 0;
276 }
277
278 static void __exit acpi_fan_exit(void)
279 {
280
281         acpi_bus_unregister_driver(&acpi_fan_driver);
282
283         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
284
285         return;
286 }
287
288 module_init(acpi_fan_init);
289 module_exit(acpi_fan_exit);