Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/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 #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 = proc_create_data(ACPI_FAN_FILE_STATE,
196                                  S_IFREG | S_IRUGO | S_IWUSR,
197                                  acpi_device_dir(device),
198                                  &acpi_fan_state_ops,
199                                  device);
200         if (!entry)
201                 return -ENODEV;
202         return 0;
203 }
204
205 static int acpi_fan_remove_fs(struct acpi_device *device)
206 {
207
208         if (acpi_device_dir(device)) {
209                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
210                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
211                 acpi_device_dir(device) = NULL;
212         }
213
214         return 0;
215 }
216 #else
217 static int acpi_fan_add_fs(struct acpi_device *device)
218 {
219         return 0;
220 }
221
222 static int acpi_fan_remove_fs(struct acpi_device *device)
223 {
224         return 0;
225 }
226 #endif
227 /* --------------------------------------------------------------------------
228                                  Driver Interface
229    -------------------------------------------------------------------------- */
230
231 static int acpi_fan_add(struct acpi_device *device)
232 {
233         int result = 0;
234         int state = 0;
235         struct thermal_cooling_device *cdev;
236
237         if (!device)
238                 return -EINVAL;
239
240         strcpy(acpi_device_name(device), "Fan");
241         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
242
243         result = acpi_bus_get_power(device->handle, &state);
244         if (result) {
245                 printk(KERN_ERR PREFIX "Reading power state\n");
246                 goto end;
247         }
248
249         device->flags.force_power_state = 1;
250         acpi_bus_set_power(device->handle, state);
251         device->flags.force_power_state = 0;
252
253         cdev = thermal_cooling_device_register("Fan", device,
254                                                 &fan_cooling_ops);
255         if (IS_ERR(cdev)) {
256                 result = PTR_ERR(cdev);
257                 goto end;
258         }
259
260         printk(KERN_INFO PREFIX
261                 "%s is registered as cooling_device%d\n",
262                 device->dev.bus_id, cdev->id);
263
264         acpi_driver_data(device) = cdev;
265         result = sysfs_create_link(&device->dev.kobj,
266                                    &cdev->device.kobj,
267                                    "thermal_cooling");
268         if (result)
269                 printk(KERN_ERR PREFIX "Create sysfs link\n");
270
271         result = sysfs_create_link(&cdev->device.kobj,
272                                    &device->dev.kobj,
273                                    "device");
274         if (result)
275                 printk(KERN_ERR PREFIX "Create sysfs link\n");
276
277         result = acpi_fan_add_fs(device);
278         if (result)
279                 goto end;
280
281         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
282                acpi_device_name(device), acpi_device_bid(device),
283                !device->power.state ? "on" : "off");
284
285       end:
286         return result;
287 }
288
289 static int acpi_fan_remove(struct acpi_device *device, int type)
290 {
291         struct thermal_cooling_device *cdev = acpi_driver_data(device);
292
293         if (!device || !cdev)
294                 return -EINVAL;
295
296         acpi_fan_remove_fs(device);
297         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
298         sysfs_remove_link(&cdev->device.kobj, "device");
299         thermal_cooling_device_unregister(cdev);
300
301         return 0;
302 }
303
304 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
305 {
306         if (!device)
307                 return -EINVAL;
308
309         acpi_bus_set_power(device->handle, ACPI_STATE_D0);
310
311         return AE_OK;
312 }
313
314 static int acpi_fan_resume(struct acpi_device *device)
315 {
316         int result = 0;
317         int power_state = 0;
318
319         if (!device)
320                 return -EINVAL;
321
322         result = acpi_bus_get_power(device->handle, &power_state);
323         if (result) {
324                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
325                                   "Error reading fan power state\n"));
326                 return result;
327         }
328
329         device->flags.force_power_state = 1;
330         acpi_bus_set_power(device->handle, power_state);
331         device->flags.force_power_state = 0;
332
333         return result;
334 }
335
336 static int __init acpi_fan_init(void)
337 {
338         int result = 0;
339
340
341 #ifdef CONFIG_ACPI_PROCFS
342         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
343         if (!acpi_fan_dir)
344                 return -ENODEV;
345         acpi_fan_dir->owner = THIS_MODULE;
346 #endif
347
348         result = acpi_bus_register_driver(&acpi_fan_driver);
349         if (result < 0) {
350                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
351                 return -ENODEV;
352         }
353
354         return 0;
355 }
356
357 static void __exit acpi_fan_exit(void)
358 {
359
360         acpi_bus_unregister_driver(&acpi_fan_driver);
361
362         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
363
364         return;
365 }
366
367 module_init(acpi_fan_init);
368 module_exit(acpi_fan_exit);