ACPI: sbs: remove dead code
[linux-3.10.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_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 struct acpi_fan {
72         struct acpi_device * device;
73 };
74
75 /* --------------------------------------------------------------------------
76                               FS Interface (/proc)
77    -------------------------------------------------------------------------- */
78
79 static struct proc_dir_entry *acpi_fan_dir;
80
81 static int acpi_fan_read_state(struct seq_file *seq, void *offset)
82 {
83         struct acpi_fan *fan = seq->private;
84         int state = 0;
85
86
87         if (fan) {
88                 if (acpi_bus_get_power(fan->device->handle, &state))
89                         seq_printf(seq, "status:                  ERROR\n");
90                 else
91                         seq_printf(seq, "status:                  %s\n",
92                                    !state ? "on" : "off");
93         }
94         return 0;
95 }
96
97 static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
98 {
99         return single_open(file, acpi_fan_read_state, PDE(inode)->data);
100 }
101
102 static ssize_t
103 acpi_fan_write_state(struct file *file, const char __user * buffer,
104                      size_t count, loff_t * ppos)
105 {
106         int result = 0;
107         struct seq_file *m = file->private_data;
108         struct acpi_fan *fan = m->private;
109         char state_string[12] = { '\0' };
110
111
112         if (!fan || (count > sizeof(state_string) - 1))
113                 return -EINVAL;
114
115         if (copy_from_user(state_string, buffer, count))
116                 return -EFAULT;
117
118         state_string[count] = '\0';
119
120         result = acpi_bus_set_power(fan->device->handle,
121                                     simple_strtoul(state_string, NULL, 0));
122         if (result)
123                 return result;
124
125         return count;
126 }
127
128 static const struct file_operations acpi_fan_state_ops = {
129         .open = acpi_fan_state_open_fs,
130         .read = seq_read,
131         .write = acpi_fan_write_state,
132         .llseek = seq_lseek,
133         .release = single_release,
134         .owner = THIS_MODULE,
135 };
136
137 static int acpi_fan_add_fs(struct acpi_device *device)
138 {
139         struct proc_dir_entry *entry = NULL;
140
141
142         if (!device)
143                 return -EINVAL;
144
145         if (!acpi_device_dir(device)) {
146                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
147                                                      acpi_fan_dir);
148                 if (!acpi_device_dir(device))
149                         return -ENODEV;
150                 acpi_device_dir(device)->owner = THIS_MODULE;
151         }
152
153         /* 'status' [R/W] */
154         entry = create_proc_entry(ACPI_FAN_FILE_STATE,
155                                   S_IFREG | S_IRUGO | S_IWUSR,
156                                   acpi_device_dir(device));
157         if (!entry)
158                 return -ENODEV;
159         else {
160                 entry->proc_fops = &acpi_fan_state_ops;
161                 entry->data = acpi_driver_data(device);
162                 entry->owner = THIS_MODULE;
163         }
164
165         return 0;
166 }
167
168 static int acpi_fan_remove_fs(struct acpi_device *device)
169 {
170
171         if (acpi_device_dir(device)) {
172                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
173                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
174                 acpi_device_dir(device) = NULL;
175         }
176
177         return 0;
178 }
179
180 /* --------------------------------------------------------------------------
181                                  Driver Interface
182    -------------------------------------------------------------------------- */
183
184 static int acpi_fan_add(struct acpi_device *device)
185 {
186         int result = 0;
187         struct acpi_fan *fan = NULL;
188         int state = 0;
189
190
191         if (!device)
192                 return -EINVAL;
193
194         fan = kzalloc(sizeof(struct acpi_fan), GFP_KERNEL);
195         if (!fan)
196                 return -ENOMEM;
197
198         fan->device = device;
199         strcpy(acpi_device_name(device), "Fan");
200         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
201         acpi_driver_data(device) = fan;
202
203         result = acpi_bus_get_power(device->handle, &state);
204         if (result) {
205                 printk(KERN_ERR PREFIX "Reading power state\n");
206                 goto end;
207         }
208
209         device->flags.force_power_state = 1;
210         acpi_bus_set_power(device->handle, state);
211         device->flags.force_power_state = 0;
212
213         result = acpi_fan_add_fs(device);
214         if (result)
215                 goto end;
216
217         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
218                acpi_device_name(device), acpi_device_bid(device),
219                !device->power.state ? "on" : "off");
220
221       end:
222         if (result)
223                 kfree(fan);
224
225         return result;
226 }
227
228 static int acpi_fan_remove(struct acpi_device *device, int type)
229 {
230         struct acpi_fan *fan = NULL;
231
232
233         if (!device || !acpi_driver_data(device))
234                 return -EINVAL;
235
236         fan = acpi_driver_data(device);
237
238         acpi_fan_remove_fs(device);
239
240         kfree(fan);
241
242         return 0;
243 }
244
245 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
246 {
247         if (!device)
248                 return -EINVAL;
249
250         acpi_bus_set_power(device->handle, ACPI_STATE_D0);
251
252         return AE_OK;
253 }
254
255 static int acpi_fan_resume(struct acpi_device *device)
256 {
257         int result = 0;
258         int power_state = 0;
259
260         if (!device)
261                 return -EINVAL;
262
263         result = acpi_bus_get_power(device->handle, &power_state);
264         if (result) {
265                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
266                                   "Error reading fan power state\n"));
267                 return result;
268         }
269
270         device->flags.force_power_state = 1;
271         acpi_bus_set_power(device->handle, power_state);
272         device->flags.force_power_state = 0;
273
274         return result;
275 }
276
277 static int __init acpi_fan_init(void)
278 {
279         int result = 0;
280
281
282         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
283         if (!acpi_fan_dir)
284                 return -ENODEV;
285         acpi_fan_dir->owner = THIS_MODULE;
286
287         result = acpi_bus_register_driver(&acpi_fan_driver);
288         if (result < 0) {
289                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
290                 return -ENODEV;
291         }
292
293         return 0;
294 }
295
296 static void __exit acpi_fan_exit(void)
297 {
298
299         acpi_bus_unregister_driver(&acpi_fan_driver);
300
301         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
302
303         return;
304 }
305
306 module_init(acpi_fan_init);
307 module_exit(acpi_fan_exit);