Merge branch 'linus' into release
[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_CLASS                  "fan"
38 #define ACPI_FAN_FILE_STATE             "state"
39
40 #define _COMPONENT              ACPI_FAN_COMPONENT
41 ACPI_MODULE_NAME("fan");
42
43 MODULE_AUTHOR("Paul Diefenbaugh");
44 MODULE_DESCRIPTION("ACPI Fan Driver");
45 MODULE_LICENSE("GPL");
46
47 static int acpi_fan_add(struct acpi_device *device);
48 static int acpi_fan_remove(struct acpi_device *device, int type);
49 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
50 static int acpi_fan_resume(struct acpi_device *device);
51
52 static const struct acpi_device_id fan_device_ids[] = {
53         {"PNP0C0B", 0},
54         {"", 0},
55 };
56 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
57
58 static struct acpi_driver acpi_fan_driver = {
59         .name = "fan",
60         .class = ACPI_FAN_CLASS,
61         .ids = fan_device_ids,
62         .ops = {
63                 .add = acpi_fan_add,
64                 .remove = acpi_fan_remove,
65                 .suspend = acpi_fan_suspend,
66                 .resume = acpi_fan_resume,
67                 },
68 };
69
70 /* thermal cooling device callbacks */
71 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
72                              *state)
73 {
74         /* ACPI fan device only support two states: ON/OFF */
75         *state = 1;
76         return 0;
77 }
78
79 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
80                              *state)
81 {
82         struct acpi_device *device = cdev->devdata;
83         int result;
84         int acpi_state;
85
86         if (!device)
87                 return -EINVAL;
88
89         result = acpi_bus_get_power(device->handle, &acpi_state);
90         if (result)
91                 return result;
92
93         *state = (acpi_state == ACPI_STATE_D3 ? 0 :
94                  (acpi_state == ACPI_STATE_D0 ? 1 : -1));
95         return 0;
96 }
97
98 static int
99 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
100 {
101         struct acpi_device *device = cdev->devdata;
102         int result;
103
104         if (!device || (state != 0 && state != 1))
105                 return -EINVAL;
106
107         result = acpi_bus_set_power(device->handle,
108                                 state ? ACPI_STATE_D0 : ACPI_STATE_D3);
109
110         return result;
111 }
112
113 static struct thermal_cooling_device_ops fan_cooling_ops = {
114         .get_max_state = fan_get_max_state,
115         .get_cur_state = fan_get_cur_state,
116         .set_cur_state = fan_set_cur_state,
117 };
118
119 /* --------------------------------------------------------------------------
120                               FS Interface (/proc)
121    -------------------------------------------------------------------------- */
122 #ifdef CONFIG_ACPI_PROCFS
123
124 static struct proc_dir_entry *acpi_fan_dir;
125
126 static int acpi_fan_read_state(struct seq_file *seq, void *offset)
127 {
128         struct acpi_device *device = seq->private;
129         int state = 0;
130
131
132         if (device) {
133                 if (acpi_bus_get_power(device->handle, &state))
134                         seq_printf(seq, "status:                  ERROR\n");
135                 else
136                         seq_printf(seq, "status:                  %s\n",
137                                    !state ? "on" : "off");
138         }
139         return 0;
140 }
141
142 static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
143 {
144         return single_open(file, acpi_fan_read_state, PDE(inode)->data);
145 }
146
147 static ssize_t
148 acpi_fan_write_state(struct file *file, const char __user * buffer,
149                      size_t count, loff_t * ppos)
150 {
151         int result = 0;
152         struct seq_file *m = file->private_data;
153         struct acpi_device *device = m->private;
154         char state_string[3] = { '\0' };
155
156         if (count > sizeof(state_string) - 1)
157                 return -EINVAL;
158
159         if (copy_from_user(state_string, buffer, count))
160                 return -EFAULT;
161
162         state_string[count] = '\0';
163         if ((state_string[0] < '0') || (state_string[0] > '3'))
164                 return -EINVAL;
165         if (state_string[1] == '\n')
166                 state_string[1] = '\0';
167         if (state_string[1] != '\0')
168                 return -EINVAL;
169
170         result = acpi_bus_set_power(device->handle,
171                                     simple_strtoul(state_string, NULL, 0));
172         if (result)
173                 return result;
174
175         return count;
176 }
177
178 static const struct file_operations acpi_fan_state_ops = {
179         .open = acpi_fan_state_open_fs,
180         .read = seq_read,
181         .write = acpi_fan_write_state,
182         .llseek = seq_lseek,
183         .release = single_release,
184         .owner = THIS_MODULE,
185 };
186
187 static int acpi_fan_add_fs(struct acpi_device *device)
188 {
189         struct proc_dir_entry *entry = NULL;
190
191
192         if (!device)
193                 return -EINVAL;
194
195         if (!acpi_device_dir(device)) {
196                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
197                                                      acpi_fan_dir);
198                 if (!acpi_device_dir(device))
199                         return -ENODEV;
200         }
201
202         /* 'status' [R/W] */
203         entry = proc_create_data(ACPI_FAN_FILE_STATE,
204                                  S_IFREG | S_IRUGO | S_IWUSR,
205                                  acpi_device_dir(device),
206                                  &acpi_fan_state_ops,
207                                  device);
208         if (!entry)
209                 return -ENODEV;
210         return 0;
211 }
212
213 static int acpi_fan_remove_fs(struct acpi_device *device)
214 {
215
216         if (acpi_device_dir(device)) {
217                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
218                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
219                 acpi_device_dir(device) = NULL;
220         }
221
222         return 0;
223 }
224 #else
225 static int acpi_fan_add_fs(struct acpi_device *device)
226 {
227         return 0;
228 }
229
230 static int acpi_fan_remove_fs(struct acpi_device *device)
231 {
232         return 0;
233 }
234 #endif
235 /* --------------------------------------------------------------------------
236                                  Driver Interface
237    -------------------------------------------------------------------------- */
238
239 static int acpi_fan_add(struct acpi_device *device)
240 {
241         int result = 0;
242         int state = 0;
243         struct thermal_cooling_device *cdev;
244
245         if (!device)
246                 return -EINVAL;
247
248         strcpy(acpi_device_name(device), "Fan");
249         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
250
251         result = acpi_bus_get_power(device->handle, &state);
252         if (result) {
253                 printk(KERN_ERR PREFIX "Reading power state\n");
254                 goto end;
255         }
256
257         device->flags.force_power_state = 1;
258         acpi_bus_set_power(device->handle, state);
259         device->flags.force_power_state = 0;
260
261         cdev = thermal_cooling_device_register("Fan", device,
262                                                 &fan_cooling_ops);
263         if (IS_ERR(cdev)) {
264                 result = PTR_ERR(cdev);
265                 goto end;
266         }
267
268         dev_info(&device->dev, "registered as cooling_device%d\n", cdev->id);
269
270         device->driver_data = cdev;
271         result = sysfs_create_link(&device->dev.kobj,
272                                    &cdev->device.kobj,
273                                    "thermal_cooling");
274         if (result)
275                 dev_err(&device->dev, "Failed to create sysfs link "
276                         "'thermal_cooling'\n");
277
278         result = sysfs_create_link(&cdev->device.kobj,
279                                    &device->dev.kobj,
280                                    "device");
281         if (result)
282                 dev_err(&device->dev, "Failed to create sysfs link "
283                         "'device'\n");
284
285         result = acpi_fan_add_fs(device);
286         if (result)
287                 goto end;
288
289         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
290                acpi_device_name(device), acpi_device_bid(device),
291                !device->power.state ? "on" : "off");
292
293       end:
294         return result;
295 }
296
297 static int acpi_fan_remove(struct acpi_device *device, int type)
298 {
299         struct thermal_cooling_device *cdev = acpi_driver_data(device);
300
301         if (!device || !cdev)
302                 return -EINVAL;
303
304         acpi_fan_remove_fs(device);
305         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
306         sysfs_remove_link(&cdev->device.kobj, "device");
307         thermal_cooling_device_unregister(cdev);
308
309         return 0;
310 }
311
312 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
313 {
314         if (!device)
315                 return -EINVAL;
316
317         acpi_bus_set_power(device->handle, ACPI_STATE_D0);
318
319         return AE_OK;
320 }
321
322 static int acpi_fan_resume(struct acpi_device *device)
323 {
324         int result = 0;
325         int power_state = 0;
326
327         if (!device)
328                 return -EINVAL;
329
330         result = acpi_bus_get_power(device->handle, &power_state);
331         if (result) {
332                 printk(KERN_ERR PREFIX
333                                   "Error reading fan power state\n");
334                 return result;
335         }
336
337         device->flags.force_power_state = 1;
338         acpi_bus_set_power(device->handle, power_state);
339         device->flags.force_power_state = 0;
340
341         return result;
342 }
343
344 static int __init acpi_fan_init(void)
345 {
346         int result = 0;
347
348
349 #ifdef CONFIG_ACPI_PROCFS
350         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
351         if (!acpi_fan_dir)
352                 return -ENODEV;
353 #endif
354
355         result = acpi_bus_register_driver(&acpi_fan_driver);
356         if (result < 0) {
357                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
358                 return -ENODEV;
359         }
360
361         return 0;
362 }
363
364 static void __exit acpi_fan_exit(void)
365 {
366
367         acpi_bus_unregister_driver(&acpi_fan_driver);
368
369         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
370
371         return;
372 }
373
374 module_init(acpi_fan_init);
375 module_exit(acpi_fan_exit);