ACPI: fan: Fix more unbalanced code block
[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 PREFIX "ACPI: "
38
39 #define ACPI_FAN_CLASS                  "fan"
40 #define ACPI_FAN_FILE_STATE             "state"
41
42 #define _COMPONENT              ACPI_FAN_COMPONENT
43 ACPI_MODULE_NAME("fan");
44
45 MODULE_AUTHOR("Paul Diefenbaugh");
46 MODULE_DESCRIPTION("ACPI Fan Driver");
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, pm_message_t state);
52 static int acpi_fan_resume(struct acpi_device *device);
53
54 static const struct acpi_device_id fan_device_ids[] = {
55         {"PNP0C0B", 0},
56         {"", 0},
57 };
58 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
59
60 static struct acpi_driver acpi_fan_driver = {
61         .name = "fan",
62         .class = ACPI_FAN_CLASS,
63         .ids = fan_device_ids,
64         .ops = {
65                 .add = acpi_fan_add,
66                 .remove = acpi_fan_remove,
67                 .suspend = acpi_fan_suspend,
68                 .resume = acpi_fan_resume,
69                 },
70 };
71
72 /* thermal cooling device callbacks */
73 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
74                              *state)
75 {
76         /* ACPI fan device only support two states: ON/OFF */
77         *state = 1;
78         return 0;
79 }
80
81 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
82                              *state)
83 {
84         struct acpi_device *device = cdev->devdata;
85         int result;
86         int acpi_state;
87
88         if (!device)
89                 return -EINVAL;
90
91         result = acpi_bus_get_power(device->handle, &acpi_state);
92         if (result)
93                 return result;
94
95         *state = (acpi_state == ACPI_STATE_D3 ? 0 :
96                  (acpi_state == ACPI_STATE_D0 ? 1 : -1));
97         return 0;
98 }
99
100 static int
101 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
102 {
103         struct acpi_device *device = cdev->devdata;
104         int result;
105
106         if (!device || (state != 0 && state != 1))
107                 return -EINVAL;
108
109         result = acpi_bus_set_power(device->handle,
110                                 state ? ACPI_STATE_D0 : ACPI_STATE_D3);
111
112         return result;
113 }
114
115 static struct thermal_cooling_device_ops fan_cooling_ops = {
116         .get_max_state = fan_get_max_state,
117         .get_cur_state = fan_get_cur_state,
118         .set_cur_state = fan_set_cur_state,
119 };
120
121 /* --------------------------------------------------------------------------
122                               FS Interface (/proc)
123    -------------------------------------------------------------------------- */
124 #ifdef CONFIG_ACPI_PROCFS
125
126 static struct proc_dir_entry *acpi_fan_dir;
127
128 static int acpi_fan_read_state(struct seq_file *seq, void *offset)
129 {
130         struct acpi_device *device = seq->private;
131         int state = 0;
132
133
134         if (device) {
135                 if (acpi_bus_get_power(device->handle, &state))
136                         seq_printf(seq, "status:                  ERROR\n");
137                 else
138                         seq_printf(seq, "status:                  %s\n",
139                                    !state ? "on" : "off");
140         }
141         return 0;
142 }
143
144 static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
145 {
146         return single_open(file, acpi_fan_read_state, PDE(inode)->data);
147 }
148
149 static ssize_t
150 acpi_fan_write_state(struct file *file, const char __user * buffer,
151                      size_t count, loff_t * ppos)
152 {
153         int result = 0;
154         struct seq_file *m = file->private_data;
155         struct acpi_device *device = m->private;
156         char state_string[3] = { '\0' };
157
158         if (count > sizeof(state_string) - 1)
159                 return -EINVAL;
160
161         if (copy_from_user(state_string, buffer, count))
162                 return -EFAULT;
163
164         state_string[count] = '\0';
165         if ((state_string[0] < '0') || (state_string[0] > '3'))
166                 return -EINVAL;
167         if (state_string[1] == '\n')
168                 state_string[1] = '\0';
169         if (state_string[1] != '\0')
170                 return -EINVAL;
171
172         result = acpi_bus_set_power(device->handle,
173                                     simple_strtoul(state_string, NULL, 0));
174         if (result)
175                 return result;
176
177         return count;
178 }
179
180 static const struct file_operations acpi_fan_state_ops = {
181         .open = acpi_fan_state_open_fs,
182         .read = seq_read,
183         .write = acpi_fan_write_state,
184         .llseek = seq_lseek,
185         .release = single_release,
186         .owner = THIS_MODULE,
187 };
188
189 static int acpi_fan_add_fs(struct acpi_device *device)
190 {
191         struct proc_dir_entry *entry = NULL;
192
193
194         if (!device)
195                 return -EINVAL;
196
197         if (!acpi_device_dir(device)) {
198                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
199                                                      acpi_fan_dir);
200                 if (!acpi_device_dir(device))
201                         return -ENODEV;
202         }
203
204         /* 'status' [R/W] */
205         entry = proc_create_data(ACPI_FAN_FILE_STATE,
206                                  S_IFREG | S_IRUGO | S_IWUSR,
207                                  acpi_device_dir(device),
208                                  &acpi_fan_state_ops,
209                                  device);
210         if (!entry)
211                 return -ENODEV;
212         return 0;
213 }
214
215 static int acpi_fan_remove_fs(struct acpi_device *device)
216 {
217
218         if (acpi_device_dir(device)) {
219                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
220                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
221                 acpi_device_dir(device) = NULL;
222         }
223
224         return 0;
225 }
226 #else
227 static int acpi_fan_add_fs(struct acpi_device *device)
228 {
229         return 0;
230 }
231
232 static int acpi_fan_remove_fs(struct acpi_device *device)
233 {
234         return 0;
235 }
236 #endif
237 /* --------------------------------------------------------------------------
238                                  Driver Interface
239    -------------------------------------------------------------------------- */
240
241 static int acpi_fan_add(struct acpi_device *device)
242 {
243         int result = 0;
244         int state = 0;
245         struct thermal_cooling_device *cdev;
246
247         if (!device)
248                 return -EINVAL;
249
250         strcpy(acpi_device_name(device), "Fan");
251         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
252
253         result = acpi_bus_get_power(device->handle, &state);
254         if (result) {
255                 printk(KERN_ERR PREFIX "Reading power state\n");
256                 goto end;
257         }
258
259         device->flags.force_power_state = 1;
260         acpi_bus_set_power(device->handle, state);
261         device->flags.force_power_state = 0;
262
263         cdev = thermal_cooling_device_register("Fan", device,
264                                                 &fan_cooling_ops);
265         if (IS_ERR(cdev)) {
266                 result = PTR_ERR(cdev);
267                 goto end;
268         }
269
270         dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
271
272         device->driver_data = cdev;
273         result = sysfs_create_link(&device->dev.kobj,
274                                    &cdev->device.kobj,
275                                    "thermal_cooling");
276         if (result)
277                 dev_err(&device->dev, "Failed to create sysfs link "
278                         "'thermal_cooling'\n");
279
280         result = sysfs_create_link(&cdev->device.kobj,
281                                    &device->dev.kobj,
282                                    "device");
283         if (result)
284                 dev_err(&device->dev, "Failed to create sysfs link "
285                         "'device'\n");
286
287         result = acpi_fan_add_fs(device);
288         if (result)
289                 goto end;
290
291         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
292                acpi_device_name(device), acpi_device_bid(device),
293                !device->power.state ? "on" : "off");
294
295       end:
296         return result;
297 }
298
299 static int acpi_fan_remove(struct acpi_device *device, int type)
300 {
301         struct thermal_cooling_device *cdev = acpi_driver_data(device);
302
303         if (!device || !cdev)
304                 return -EINVAL;
305
306         acpi_fan_remove_fs(device);
307         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
308         sysfs_remove_link(&cdev->device.kobj, "device");
309         thermal_cooling_device_unregister(cdev);
310
311         return 0;
312 }
313
314 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
315 {
316         if (!device)
317                 return -EINVAL;
318
319         acpi_bus_set_power(device->handle, ACPI_STATE_D0);
320
321         return AE_OK;
322 }
323
324 static int acpi_fan_resume(struct acpi_device *device)
325 {
326         int result = 0;
327         int power_state = 0;
328
329         if (!device)
330                 return -EINVAL;
331
332         result = acpi_bus_get_power(device->handle, &power_state);
333         if (result) {
334                 printk(KERN_ERR PREFIX
335                                   "Error reading fan power state\n");
336                 return result;
337         }
338
339         device->flags.force_power_state = 1;
340         acpi_bus_set_power(device->handle, power_state);
341         device->flags.force_power_state = 0;
342
343         return result;
344 }
345
346 static int __init acpi_fan_init(void)
347 {
348         int result = 0;
349
350 #ifdef CONFIG_ACPI_PROCFS
351         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
352         if (!acpi_fan_dir)
353                 return -ENODEV;
354 #endif
355
356         result = acpi_bus_register_driver(&acpi_fan_driver);
357         if (result < 0) {
358 #ifdef CONFIG_ACPI_PROCFS
359                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
360 #endif
361                 return -ENODEV;
362         }
363
364         return 0;
365 }
366
367 static void __exit acpi_fan_exit(void)
368 {
369
370         acpi_bus_unregister_driver(&acpi_fan_driver);
371
372 #ifdef CONFIG_ACPI_PROCFS
373         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
374 #endif
375
376         return;
377 }
378
379 module_init(acpi_fan_init);
380 module_exit(acpi_fan_exit);