ACPI: fan: build fix for CONFIG_ACPI_PROCFS=n
[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 #include <linux/thermal.h>
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 /* thermal cooling device callbacks */
72 static int fan_get_max_state(struct thermal_cooling_device *cdev, char *buf)
73 {
74         /* ACPI fan device only support two states: ON/OFF */
75         return sprintf(buf, "1\n");
76 }
77
78 static int fan_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
79 {
80         struct acpi_device *device = cdev->devdata;
81         int state;
82         int result;
83
84         if (!device)
85                 return -EINVAL;
86
87         result = acpi_bus_get_power(device->handle, &state);
88         if (result)
89                 return result;
90
91         return sprintf(buf, "%s\n", state == ACPI_STATE_D3 ? "0" :
92                          (state == ACPI_STATE_D0 ? "1" : "unknown"));
93 }
94
95 static int
96 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
97 {
98         struct acpi_device *device = cdev->devdata;
99         int result;
100
101         if (!device || (state != 0 && state != 1))
102                 return -EINVAL;
103
104         result = acpi_bus_set_power(device->handle,
105                                 state ? ACPI_STATE_D0 : ACPI_STATE_D3);
106
107         return result;
108 }
109
110 static struct thermal_cooling_device_ops fan_cooling_ops = {
111         .get_max_state = fan_get_max_state,
112         .get_cur_state = fan_get_cur_state,
113         .set_cur_state = fan_set_cur_state,
114 };
115
116 /* --------------------------------------------------------------------------
117                               FS Interface (/proc)
118    -------------------------------------------------------------------------- */
119 #ifdef CONFIG_ACPI_PROCFS
120
121 static struct proc_dir_entry *acpi_fan_dir;
122
123 static int acpi_fan_read_state(struct seq_file *seq, void *offset)
124 {
125         struct acpi_device *device = seq->private;
126         int state = 0;
127
128
129         if (device) {
130                 if (acpi_bus_get_power(device->handle, &state))
131                         seq_printf(seq, "status:                  ERROR\n");
132                 else
133                         seq_printf(seq, "status:                  %s\n",
134                                    !state ? "on" : "off");
135         }
136         return 0;
137 }
138
139 static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
140 {
141         return single_open(file, acpi_fan_read_state, PDE(inode)->data);
142 }
143
144 static ssize_t
145 acpi_fan_write_state(struct file *file, const char __user * buffer,
146                      size_t count, loff_t * ppos)
147 {
148         int result = 0;
149         struct seq_file *m = file->private_data;
150         struct acpi_device *device = m->private;
151         char state_string[12] = { '\0' };
152
153         if (count > sizeof(state_string) - 1)
154                 return -EINVAL;
155
156         if (copy_from_user(state_string, buffer, count))
157                 return -EFAULT;
158
159         state_string[count] = '\0';
160
161         result = acpi_bus_set_power(device->handle,
162                                     simple_strtoul(state_string, NULL, 0));
163         if (result)
164                 return result;
165
166         return count;
167 }
168
169 static const struct file_operations acpi_fan_state_ops = {
170         .open = acpi_fan_state_open_fs,
171         .read = seq_read,
172         .write = acpi_fan_write_state,
173         .llseek = seq_lseek,
174         .release = single_release,
175         .owner = THIS_MODULE,
176 };
177
178 static int acpi_fan_add_fs(struct acpi_device *device)
179 {
180         struct proc_dir_entry *entry = NULL;
181
182
183         if (!device)
184                 return -EINVAL;
185
186         if (!acpi_device_dir(device)) {
187                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
188                                                      acpi_fan_dir);
189                 if (!acpi_device_dir(device))
190                         return -ENODEV;
191                 acpi_device_dir(device)->owner = THIS_MODULE;
192         }
193
194         /* 'status' [R/W] */
195         entry = create_proc_entry(ACPI_FAN_FILE_STATE,
196                                   S_IFREG | S_IRUGO | S_IWUSR,
197                                   acpi_device_dir(device));
198         if (!entry)
199                 return -ENODEV;
200         else {
201                 entry->proc_fops = &acpi_fan_state_ops;
202                 entry->data = device;
203                 entry->owner = THIS_MODULE;
204         }
205
206         return 0;
207 }
208
209 static int acpi_fan_remove_fs(struct acpi_device *device)
210 {
211
212         if (acpi_device_dir(device)) {
213                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
214                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
215                 acpi_device_dir(device) = NULL;
216         }
217
218         return 0;
219 }
220 #else
221 static int acpi_fan_add_fs(struct acpi_device *device)
222 {
223         return 0;
224 }
225
226 static int acpi_fan_remove_fs(struct acpi_device *device)
227 {
228         return 0;
229 }
230 #endif
231 /* --------------------------------------------------------------------------
232                                  Driver Interface
233    -------------------------------------------------------------------------- */
234
235 static int acpi_fan_add(struct acpi_device *device)
236 {
237         int result = 0;
238         int state = 0;
239         struct thermal_cooling_device *cdev;
240
241         if (!device)
242                 return -EINVAL;
243
244         strcpy(acpi_device_name(device), "Fan");
245         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
246
247         result = acpi_bus_get_power(device->handle, &state);
248         if (result) {
249                 printk(KERN_ERR PREFIX "Reading power state\n");
250                 goto end;
251         }
252
253         device->flags.force_power_state = 1;
254         acpi_bus_set_power(device->handle, state);
255         device->flags.force_power_state = 0;
256
257         cdev = thermal_cooling_device_register("Fan", device,
258                                                 &fan_cooling_ops);
259         if (cdev)
260                 printk(KERN_INFO PREFIX
261                         "%s is registered as cooling_device%d\n",
262                         device->dev.bus_id, cdev->id);
263         else
264                 goto end;
265         acpi_driver_data(device) = cdev;
266         result = sysfs_create_link(&device->dev.kobj, &cdev->device.kobj,
267                                         "thermal_cooling");
268         if (result)
269                 return result;
270
271         result = sysfs_create_link(&cdev->device.kobj, &device->dev.kobj,
272                                        "device");
273         if (result)
274                 return result;
275
276         result = acpi_fan_add_fs(device);
277         if (result)
278                 goto end;
279
280         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
281                acpi_device_name(device), acpi_device_bid(device),
282                !device->power.state ? "on" : "off");
283
284       end:
285         return result;
286 }
287
288 static int acpi_fan_remove(struct acpi_device *device, int type)
289 {
290         struct thermal_cooling_device *cdev = acpi_driver_data(device);
291
292         if (!device || !cdev)
293                 return -EINVAL;
294
295         acpi_fan_remove_fs(device);
296         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
297         sysfs_remove_link(&cdev->device.kobj, "device");
298         thermal_cooling_device_unregister(cdev);
299
300         return 0;
301 }
302
303 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
304 {
305         if (!device)
306                 return -EINVAL;
307
308         acpi_bus_set_power(device->handle, ACPI_STATE_D0);
309
310         return AE_OK;
311 }
312
313 static int acpi_fan_resume(struct acpi_device *device)
314 {
315         int result = 0;
316         int power_state = 0;
317
318         if (!device)
319                 return -EINVAL;
320
321         result = acpi_bus_get_power(device->handle, &power_state);
322         if (result) {
323                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
324                                   "Error reading fan power state\n"));
325                 return result;
326         }
327
328         device->flags.force_power_state = 1;
329         acpi_bus_set_power(device->handle, power_state);
330         device->flags.force_power_state = 0;
331
332         return result;
333 }
334
335 static int __init acpi_fan_init(void)
336 {
337         int result = 0;
338
339
340 #ifdef CONFIG_ACPI_PROCFS
341         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
342         if (!acpi_fan_dir)
343                 return -ENODEV;
344         acpi_fan_dir->owner = THIS_MODULE;
345 #endif
346
347         result = acpi_bus_register_driver(&acpi_fan_driver);
348         if (result < 0) {
349                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
350                 return -ENODEV;
351         }
352
353         return 0;
354 }
355
356 static void __exit acpi_fan_exit(void)
357 {
358
359         acpi_bus_unregister_driver(&acpi_fan_driver);
360
361         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
362
363         return;
364 }
365
366 module_init(acpi_fan_init);
367 module_exit(acpi_fan_exit);