[SPARC64]: Partially revert "Constify function pointer tables."
[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
51 static const struct acpi_device_id fan_device_ids[] = {
52         {"PNP0C0B", 0},
53         {"", 0},
54 };
55 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
56
57 static struct acpi_driver acpi_fan_driver = {
58         .name = "fan",
59         .class = ACPI_FAN_CLASS,
60         .ids = fan_device_ids,
61         .ops = {
62                 .add = acpi_fan_add,
63                 .remove = acpi_fan_remove,
64                 },
65 };
66
67 /* --------------------------------------------------------------------------
68                               FS Interface (/proc)
69    -------------------------------------------------------------------------- */
70
71 static struct proc_dir_entry *acpi_fan_dir;
72
73 static int acpi_fan_read_state(struct seq_file *seq, void *offset)
74 {
75         struct acpi_device *device = seq->private;
76         int state = 0;
77
78
79         if (device) {
80                 if (acpi_bus_get_power(device->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 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 = file->private_data;
100         struct acpi_device *device = m->private;
101         char state_string[12] = { '\0' };
102
103         if (count > sizeof(state_string) - 1)
104                 return -EINVAL;
105
106         if (copy_from_user(state_string, buffer, count))
107                 return -EFAULT;
108
109         state_string[count] = '\0';
110
111         result = acpi_bus_set_power(device->handle,
112                                     simple_strtoul(state_string, NULL, 0));
113         if (result)
114                 return result;
115
116         return count;
117 }
118
119 static const struct file_operations acpi_fan_state_ops = {
120         .open = acpi_fan_state_open_fs,
121         .read = seq_read,
122         .write = acpi_fan_write_state,
123         .llseek = seq_lseek,
124         .release = single_release,
125         .owner = THIS_MODULE,
126 };
127
128 static int acpi_fan_add_fs(struct acpi_device *device)
129 {
130         struct proc_dir_entry *entry = NULL;
131
132
133         if (!device)
134                 return -EINVAL;
135
136         if (!acpi_device_dir(device)) {
137                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
138                                                      acpi_fan_dir);
139                 if (!acpi_device_dir(device))
140                         return -ENODEV;
141                 acpi_device_dir(device)->owner = THIS_MODULE;
142         }
143
144         /* 'status' [R/W] */
145         entry = create_proc_entry(ACPI_FAN_FILE_STATE,
146                                   S_IFREG | S_IRUGO | S_IWUSR,
147                                   acpi_device_dir(device));
148         if (!entry)
149                 return -ENODEV;
150         else {
151                 entry->proc_fops = &acpi_fan_state_ops;
152                 entry->data = device;
153                 entry->owner = THIS_MODULE;
154         }
155
156         return 0;
157 }
158
159 static int acpi_fan_remove_fs(struct acpi_device *device)
160 {
161
162         if (acpi_device_dir(device)) {
163                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
164                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
165                 acpi_device_dir(device) = NULL;
166         }
167
168         return 0;
169 }
170
171 /* --------------------------------------------------------------------------
172                                  Driver Interface
173    -------------------------------------------------------------------------- */
174
175 static int acpi_fan_add(struct acpi_device *device)
176 {
177         int result = 0;
178         struct acpi_fan *fan = NULL;
179         int state = 0;
180
181
182         if (!device)
183                 return -EINVAL;
184
185         strcpy(acpi_device_name(device), "Fan");
186         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
187
188         result = acpi_bus_get_power(device->handle, &state);
189         if (result) {
190                 printk(KERN_ERR PREFIX "Reading power state\n");
191                 goto end;
192         }
193
194         result = acpi_fan_add_fs(device);
195         if (result)
196                 goto end;
197
198         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
199                acpi_device_name(device), acpi_device_bid(device),
200                !device->power.state ? "on" : "off");
201
202       end:
203         if (result)
204                 kfree(fan);
205
206         return result;
207 }
208
209 static int acpi_fan_remove(struct acpi_device *device, int type)
210 {
211         if (!device || !acpi_driver_data(device))
212                 return -EINVAL;
213
214         acpi_fan_remove_fs(device);
215
216         return 0;
217 }
218
219 static int __init acpi_fan_init(void)
220 {
221         int result = 0;
222
223
224         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
225         if (!acpi_fan_dir)
226                 return -ENODEV;
227         acpi_fan_dir->owner = THIS_MODULE;
228
229         result = acpi_bus_register_driver(&acpi_fan_driver);
230         if (result < 0) {
231                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
232                 return -ENODEV;
233         }
234
235         return 0;
236 }
237
238 static void __exit acpi_fan_exit(void)
239 {
240
241         acpi_bus_unregister_driver(&acpi_fan_driver);
242
243         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
244
245         return;
246 }
247
248 module_init(acpi_fan_init);
249 module_exit(acpi_fan_exit);