ACPI: Enable ACPI error messages w/o CONFIG_ACPI_DEBUG
[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_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 static int acpi_fan_suspend(struct acpi_device *device, int state);
52 static int acpi_fan_resume(struct acpi_device *device, int state);
53
54 static struct acpi_driver acpi_fan_driver = {
55         .name = ACPI_FAN_DRIVER_NAME,
56         .class = ACPI_FAN_CLASS,
57         .ids = "PNP0C0B",
58         .ops = {
59                 .add = acpi_fan_add,
60                 .remove = acpi_fan_remove,
61                 .suspend = acpi_fan_suspend,
62                 .resume = acpi_fan_resume,
63                 },
64 };
65
66 struct acpi_fan {
67         acpi_handle handle;
68 };
69
70 /* --------------------------------------------------------------------------
71                               FS Interface (/proc)
72    -------------------------------------------------------------------------- */
73
74 static struct proc_dir_entry *acpi_fan_dir;
75
76 static int acpi_fan_read_state(struct seq_file *seq, void *offset)
77 {
78         struct acpi_fan *fan = seq->private;
79         int state = 0;
80
81         ACPI_FUNCTION_TRACE("acpi_fan_read_state");
82
83         if (fan) {
84                 if (acpi_bus_get_power(fan->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_VALUE(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 = (struct seq_file *)file->private_data;
104         struct acpi_fan *fan = (struct acpi_fan *)m->private;
105         char state_string[12] = { '\0' };
106
107         ACPI_FUNCTION_TRACE("acpi_fan_write_state");
108
109         if (!fan || (count > sizeof(state_string) - 1))
110                 return_VALUE(-EINVAL);
111
112         if (copy_from_user(state_string, buffer, count))
113                 return_VALUE(-EFAULT);
114
115         state_string[count] = '\0';
116
117         result = acpi_bus_set_power(fan->handle,
118                                     simple_strtoul(state_string, NULL, 0));
119         if (result)
120                 return_VALUE(result);
121
122         return_VALUE(count);
123 }
124
125 static struct file_operations acpi_fan_state_ops = {
126         .open = acpi_fan_state_open_fs,
127         .read = seq_read,
128         .write = acpi_fan_write_state,
129         .llseek = seq_lseek,
130         .release = single_release,
131         .owner = THIS_MODULE,
132 };
133
134 static int acpi_fan_add_fs(struct acpi_device *device)
135 {
136         struct proc_dir_entry *entry = NULL;
137
138         ACPI_FUNCTION_TRACE("acpi_fan_add_fs");
139
140         if (!device)
141                 return_VALUE(-EINVAL);
142
143         if (!acpi_device_dir(device)) {
144                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
145                                                      acpi_fan_dir);
146                 if (!acpi_device_dir(device))
147                         return_VALUE(-ENODEV);
148                 acpi_device_dir(device)->owner = THIS_MODULE;
149         }
150
151         /* 'status' [R/W] */
152         entry = create_proc_entry(ACPI_FAN_FILE_STATE,
153                                   S_IFREG | S_IRUGO | S_IWUSR,
154                                   acpi_device_dir(device));
155         if (!entry)
156                 return_VALUE(-ENODEV);
157         else {
158                 entry->proc_fops = &acpi_fan_state_ops;
159                 entry->data = acpi_driver_data(device);
160                 entry->owner = THIS_MODULE;
161         }
162
163         return_VALUE(0);
164 }
165
166 static int acpi_fan_remove_fs(struct acpi_device *device)
167 {
168         ACPI_FUNCTION_TRACE("acpi_fan_remove_fs");
169
170         if (acpi_device_dir(device)) {
171                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
172                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
173                 acpi_device_dir(device) = NULL;
174         }
175
176         return_VALUE(0);
177 }
178
179 /* --------------------------------------------------------------------------
180                                  Driver Interface
181    -------------------------------------------------------------------------- */
182
183 static int acpi_fan_add(struct acpi_device *device)
184 {
185         int result = 0;
186         struct acpi_fan *fan = NULL;
187         int state = 0;
188
189         ACPI_FUNCTION_TRACE("acpi_fan_add");
190
191         if (!device)
192                 return_VALUE(-EINVAL);
193
194         fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL);
195         if (!fan)
196                 return_VALUE(-ENOMEM);
197         memset(fan, 0, sizeof(struct acpi_fan));
198
199         fan->handle = device->handle;
200         strcpy(acpi_device_name(device), "Fan");
201         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
202         acpi_driver_data(device) = fan;
203
204         result = acpi_bus_get_power(fan->handle, &state);
205         if (result) {
206                 ACPI_ERROR((AE_INFO, "Reading power state"));
207                 goto end;
208         }
209
210         device->flags.force_power_state = 1;
211         acpi_bus_set_power(device->handle, state);
212         device->flags.force_power_state = 0;
213
214         result = acpi_fan_add_fs(device);
215         if (result)
216                 goto end;
217
218         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
219                acpi_device_name(device), acpi_device_bid(device),
220                !device->power.state ? "on" : "off");
221
222       end:
223         if (result)
224                 kfree(fan);
225
226         return_VALUE(result);
227 }
228
229 static int acpi_fan_remove(struct acpi_device *device, int type)
230 {
231         struct acpi_fan *fan = NULL;
232
233         ACPI_FUNCTION_TRACE("acpi_fan_remove");
234
235         if (!device || !acpi_driver_data(device))
236                 return_VALUE(-EINVAL);
237
238         fan = (struct acpi_fan *)acpi_driver_data(device);
239
240         acpi_fan_remove_fs(device);
241
242         kfree(fan);
243
244         return_VALUE(0);
245 }
246
247 static int acpi_fan_suspend(struct acpi_device *device, int state)
248 {
249         if (!device)
250                 return -EINVAL;
251
252         acpi_bus_set_power(device->handle, ACPI_STATE_D0);
253
254         return AE_OK;
255 }
256
257 static int acpi_fan_resume(struct acpi_device *device, int state)
258 {
259         int result = 0;
260         int power_state = 0;
261
262         if (!device)
263                 return -EINVAL;
264
265         result = acpi_bus_get_power(device->handle, &power_state);
266         if (result) {
267                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
268                                   "Error reading fan power state\n"));
269                 return result;
270         }
271
272         device->flags.force_power_state = 1;
273         acpi_bus_set_power(device->handle, power_state);
274         device->flags.force_power_state = 0;
275
276         return result;
277 }
278
279 static int __init acpi_fan_init(void)
280 {
281         int result = 0;
282
283         ACPI_FUNCTION_TRACE("acpi_fan_init");
284
285         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
286         if (!acpi_fan_dir)
287                 return_VALUE(-ENODEV);
288         acpi_fan_dir->owner = THIS_MODULE;
289
290         result = acpi_bus_register_driver(&acpi_fan_driver);
291         if (result < 0) {
292                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
293                 return_VALUE(-ENODEV);
294         }
295
296         return_VALUE(0);
297 }
298
299 static void __exit acpi_fan_exit(void)
300 {
301         ACPI_FUNCTION_TRACE("acpi_fan_exit");
302
303         acpi_bus_unregister_driver(&acpi_fan_driver);
304
305         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
306
307         return_VOID;
308 }
309
310 module_init(acpi_fan_init);
311 module_exit(acpi_fan_exit);