ACPI: create acpi_fan_suspend()/acpi_fan_resume()
[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
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_DRIVER_NAME            "ACPI Fan Driver"
40 #define ACPI_FAN_FILE_STATE             "state"
41
42 #define _COMPONENT              ACPI_FAN_COMPONENT
43 ACPI_MODULE_NAME("acpi_fan")
44
45     MODULE_AUTHOR("Paul Diefenbaugh");
46 MODULE_DESCRIPTION(ACPI_FAN_DRIVER_NAME);
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, int state);
52 static int acpi_fan_resume(struct acpi_device *device, int state);
53
54 static struct acpi_driver acpi_fan_driver = {
55         .name = ACPI_FAN_DRIVER_NAME,
56         .class = ACPI_FAN_CLASS,
57         .ids = "PNP0C0B",
58         .ops = {
59                 .add = acpi_fan_add,
60                 .remove = acpi_fan_remove,
61                 .suspend = acpi_fan_suspend,
62                 .resume = acpi_fan_resume,
63                 },
64 };
65
66 struct acpi_fan {
67         acpi_handle handle;
68 };
69
70 /* --------------------------------------------------------------------------
71                               FS Interface (/proc)
72    -------------------------------------------------------------------------- */
73
74 static struct proc_dir_entry *acpi_fan_dir;
75
76 static int acpi_fan_read_state(struct seq_file *seq, void *offset)
77 {
78         struct acpi_fan *fan = seq->private;
79         int state = 0;
80
81         ACPI_FUNCTION_TRACE("acpi_fan_read_state");
82
83         if (fan) {
84                 if (acpi_bus_get_power(fan->handle, &state))
85                         seq_printf(seq, "status:                  ERROR\n");
86                 else
87                         seq_printf(seq, "status:                  %s\n",
88                                    !state ? "on" : "off");
89         }
90         return_VALUE(0);
91 }
92
93 static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
94 {
95         return single_open(file, acpi_fan_read_state, PDE(inode)->data);
96 }
97
98 static ssize_t
99 acpi_fan_write_state(struct file *file, const char __user * buffer,
100                      size_t count, loff_t * ppos)
101 {
102         int result = 0;
103         struct seq_file *m = (struct seq_file *)file->private_data;
104         struct acpi_fan *fan = (struct acpi_fan *)m->private;
105         char state_string[12] = { '\0' };
106
107         ACPI_FUNCTION_TRACE("acpi_fan_write_state");
108
109         if (!fan || (count > sizeof(state_string) - 1))
110                 return_VALUE(-EINVAL);
111
112         if (copy_from_user(state_string, buffer, count))
113                 return_VALUE(-EFAULT);
114
115         state_string[count] = '\0';
116
117         result = acpi_bus_set_power(fan->handle,
118                                     simple_strtoul(state_string, NULL, 0));
119         if (result)
120                 return_VALUE(result);
121
122         return_VALUE(count);
123 }
124
125 static struct file_operations acpi_fan_state_ops = {
126         .open = acpi_fan_state_open_fs,
127         .read = seq_read,
128         .write = acpi_fan_write_state,
129         .llseek = seq_lseek,
130         .release = single_release,
131         .owner = THIS_MODULE,
132 };
133
134 static int acpi_fan_add_fs(struct acpi_device *device)
135 {
136         struct proc_dir_entry *entry = NULL;
137
138         ACPI_FUNCTION_TRACE("acpi_fan_add_fs");
139
140         if (!device)
141                 return_VALUE(-EINVAL);
142
143         if (!acpi_device_dir(device)) {
144                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
145                                                      acpi_fan_dir);
146                 if (!acpi_device_dir(device))
147                         return_VALUE(-ENODEV);
148                 acpi_device_dir(device)->owner = THIS_MODULE;
149         }
150
151         /* 'status' [R/W] */
152         entry = create_proc_entry(ACPI_FAN_FILE_STATE,
153                                   S_IFREG | S_IRUGO | S_IWUSR,
154                                   acpi_device_dir(device));
155         if (!entry)
156                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
157                                   "Unable to create '%s' fs entry\n",
158                                   ACPI_FAN_FILE_STATE));
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_VALUE(0);
166 }
167
168 static int acpi_fan_remove_fs(struct acpi_device *device)
169 {
170         ACPI_FUNCTION_TRACE("acpi_fan_remove_fs");
171
172         if (acpi_device_dir(device)) {
173                 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
174                 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
175                 acpi_device_dir(device) = NULL;
176         }
177
178         return_VALUE(0);
179 }
180
181 /* --------------------------------------------------------------------------
182                                  Driver Interface
183    -------------------------------------------------------------------------- */
184
185 static int acpi_fan_add(struct acpi_device *device)
186 {
187         int result = 0;
188         struct acpi_fan *fan = NULL;
189         int state = 0;
190
191         ACPI_FUNCTION_TRACE("acpi_fan_add");
192
193         if (!device)
194                 return_VALUE(-EINVAL);
195
196         fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL);
197         if (!fan)
198                 return_VALUE(-ENOMEM);
199         memset(fan, 0, sizeof(struct acpi_fan));
200
201         fan->handle = device->handle;
202         strcpy(acpi_device_name(device), "Fan");
203         strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
204         acpi_driver_data(device) = fan;
205
206         result = acpi_bus_get_power(fan->handle, &state);
207         if (result) {
208                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
209                                   "Error reading power state\n"));
210                 goto end;
211         }
212
213         device->flags.force_power_state = 1;
214         acpi_bus_set_power(device->handle, state);
215         device->flags.force_power_state = 0;
216
217         result = acpi_fan_add_fs(device);
218         if (result)
219                 goto end;
220
221         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
222                acpi_device_name(device), acpi_device_bid(device),
223                !device->power.state ? "on" : "off");
224
225       end:
226         if (result)
227                 kfree(fan);
228
229         return_VALUE(result);
230 }
231
232 static int acpi_fan_remove(struct acpi_device *device, int type)
233 {
234         struct acpi_fan *fan = NULL;
235
236         ACPI_FUNCTION_TRACE("acpi_fan_remove");
237
238         if (!device || !acpi_driver_data(device))
239                 return_VALUE(-EINVAL);
240
241         fan = (struct acpi_fan *)acpi_driver_data(device);
242
243         acpi_fan_remove_fs(device);
244
245         kfree(fan);
246
247         return_VALUE(0);
248 }
249
250 static int acpi_fan_suspend(struct acpi_device *device, int state)
251 {
252         if (!device)
253                 return -EINVAL;
254
255         acpi_bus_set_power(device->handle, ACPI_STATE_D0);
256
257         return AE_OK;
258 }
259
260 static int acpi_fan_resume(struct acpi_device *device, int state)
261 {
262         int result = 0;
263         int power_state = 0;
264
265         if (!device)
266                 return -EINVAL;
267
268         result = acpi_bus_get_power(device->handle, &power_state);
269         if (result) {
270                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
271                                   "Error reading fan power state\n"));
272                 return result;
273         }
274
275         device->flags.force_power_state = 1;
276         acpi_bus_set_power(device->handle, power_state);
277         device->flags.force_power_state = 0;
278
279         return result;
280 }
281
282 static int __init acpi_fan_init(void)
283 {
284         int result = 0;
285
286         ACPI_FUNCTION_TRACE("acpi_fan_init");
287
288         acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
289         if (!acpi_fan_dir)
290                 return_VALUE(-ENODEV);
291         acpi_fan_dir->owner = THIS_MODULE;
292
293         result = acpi_bus_register_driver(&acpi_fan_driver);
294         if (result < 0) {
295                 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
296                 return_VALUE(-ENODEV);
297         }
298
299         return_VALUE(0);
300 }
301
302 static void __exit acpi_fan_exit(void)
303 {
304         ACPI_FUNCTION_TRACE("acpi_fan_exit");
305
306         acpi_bus_unregister_driver(&acpi_fan_driver);
307
308         remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
309
310         return_VOID;
311 }
312
313 module_init(acpi_fan_init);
314 module_exit(acpi_fan_exit);