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