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1da177e4 LT |
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 | ||
38 | #define ACPI_FAN_COMPONENT 0x00200000 | |
39 | #define ACPI_FAN_CLASS "fan" | |
40 | #define ACPI_FAN_HID "PNP0C0B" | |
41 | #define ACPI_FAN_DRIVER_NAME "ACPI Fan Driver" | |
42 | #define ACPI_FAN_DEVICE_NAME "Fan" | |
43 | #define ACPI_FAN_FILE_STATE "state" | |
44 | #define ACPI_FAN_NOTIFY_STATUS 0x80 | |
45 | ||
46 | #define _COMPONENT ACPI_FAN_COMPONENT | |
47 | ACPI_MODULE_NAME ("acpi_fan") | |
48 | ||
49 | MODULE_AUTHOR("Paul Diefenbaugh"); | |
50 | MODULE_DESCRIPTION(ACPI_FAN_DRIVER_NAME); | |
51 | MODULE_LICENSE("GPL"); | |
52 | ||
53 | static int acpi_fan_add (struct acpi_device *device); | |
54 | static int acpi_fan_remove (struct acpi_device *device, int type); | |
55 | ||
56 | static struct acpi_driver acpi_fan_driver = { | |
57 | .name = ACPI_FAN_DRIVER_NAME, | |
58 | .class = ACPI_FAN_CLASS, | |
59 | .ids = ACPI_FAN_HID, | |
60 | .ops = { | |
61 | .add = acpi_fan_add, | |
62 | .remove = acpi_fan_remove, | |
63 | }, | |
64 | }; | |
65 | ||
66 | struct acpi_fan { | |
67 | acpi_handle handle; | |
68 | }; | |
69 | ||
70 | ||
71 | /* -------------------------------------------------------------------------- | |
72 | FS Interface (/proc) | |
73 | -------------------------------------------------------------------------- */ | |
74 | ||
75 | static struct proc_dir_entry *acpi_fan_dir; | |
76 | ||
77 | ||
78 | static int | |
79 | acpi_fan_read_state (struct seq_file *seq, void *offset) | |
80 | { | |
81 | struct acpi_fan *fan = seq->private; | |
82 | int state = 0; | |
83 | ||
84 | ACPI_FUNCTION_TRACE("acpi_fan_read_state"); | |
85 | ||
86 | if (fan) { | |
87 | if (acpi_bus_get_power(fan->handle, &state)) | |
88 | seq_printf(seq, "status: ERROR\n"); | |
89 | else | |
90 | seq_printf(seq, "status: %s\n", | |
91 | !state?"on":"off"); | |
92 | } | |
93 | return_VALUE(0); | |
94 | } | |
95 | ||
96 | static int acpi_fan_state_open_fs(struct inode *inode, struct file *file) | |
97 | { | |
98 | return single_open(file, acpi_fan_read_state, PDE(inode)->data); | |
99 | } | |
100 | ||
101 | static ssize_t | |
102 | acpi_fan_write_state ( | |
103 | struct file *file, | |
104 | const char __user *buffer, | |
105 | size_t count, | |
106 | loff_t *ppos) | |
107 | { | |
108 | int result = 0; | |
109 | struct seq_file *m = (struct seq_file *)file->private_data; | |
110 | struct acpi_fan *fan = (struct acpi_fan *) m->private; | |
111 | char state_string[12] = {'\0'}; | |
112 | ||
113 | ACPI_FUNCTION_TRACE("acpi_fan_write_state"); | |
114 | ||
115 | if (!fan || (count > sizeof(state_string) - 1)) | |
116 | return_VALUE(-EINVAL); | |
117 | ||
118 | if (copy_from_user(state_string, buffer, count)) | |
119 | return_VALUE(-EFAULT); | |
120 | ||
121 | state_string[count] = '\0'; | |
122 | ||
123 | result = acpi_bus_set_power(fan->handle, | |
124 | simple_strtoul(state_string, NULL, 0)); | |
125 | if (result) | |
126 | return_VALUE(result); | |
127 | ||
128 | return_VALUE(count); | |
129 | } | |
130 | ||
131 | static struct file_operations acpi_fan_state_ops = { | |
132 | .open = acpi_fan_state_open_fs, | |
133 | .read = seq_read, | |
134 | .write = acpi_fan_write_state, | |
135 | .llseek = seq_lseek, | |
136 | .release = single_release, | |
137 | .owner = THIS_MODULE, | |
138 | }; | |
139 | ||
140 | static int | |
141 | acpi_fan_add_fs ( | |
142 | struct acpi_device *device) | |
143 | { | |
144 | struct proc_dir_entry *entry = NULL; | |
145 | ||
146 | ACPI_FUNCTION_TRACE("acpi_fan_add_fs"); | |
147 | ||
148 | if (!device) | |
149 | return_VALUE(-EINVAL); | |
150 | ||
151 | if (!acpi_device_dir(device)) { | |
152 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
153 | acpi_fan_dir); | |
154 | if (!acpi_device_dir(device)) | |
155 | return_VALUE(-ENODEV); | |
156 | acpi_device_dir(device)->owner = THIS_MODULE; | |
157 | } | |
158 | ||
159 | /* 'status' [R/W] */ | |
160 | entry = create_proc_entry(ACPI_FAN_FILE_STATE, | |
161 | S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device)); | |
162 | if (!entry) | |
163 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
164 | "Unable to create '%s' fs entry\n", | |
165 | ACPI_FAN_FILE_STATE)); | |
166 | else { | |
167 | entry->proc_fops = &acpi_fan_state_ops; | |
168 | entry->data = acpi_driver_data(device); | |
169 | entry->owner = THIS_MODULE; | |
170 | } | |
171 | ||
172 | return_VALUE(0); | |
173 | } | |
174 | ||
175 | ||
176 | static int | |
177 | acpi_fan_remove_fs ( | |
178 | struct acpi_device *device) | |
179 | { | |
180 | ACPI_FUNCTION_TRACE("acpi_fan_remove_fs"); | |
181 | ||
182 | if (acpi_device_dir(device)) { | |
183 | remove_proc_entry(ACPI_FAN_FILE_STATE, | |
184 | acpi_device_dir(device)); | |
185 | remove_proc_entry(acpi_device_bid(device), acpi_fan_dir); | |
186 | acpi_device_dir(device) = NULL; | |
187 | } | |
188 | ||
189 | return_VALUE(0); | |
190 | } | |
191 | ||
192 | ||
193 | /* -------------------------------------------------------------------------- | |
194 | Driver Interface | |
195 | -------------------------------------------------------------------------- */ | |
196 | ||
197 | static int | |
198 | acpi_fan_add ( | |
199 | struct acpi_device *device) | |
200 | { | |
201 | int result = 0; | |
202 | struct acpi_fan *fan = NULL; | |
203 | int state = 0; | |
204 | ||
205 | ACPI_FUNCTION_TRACE("acpi_fan_add"); | |
206 | ||
207 | if (!device) | |
208 | return_VALUE(-EINVAL); | |
209 | ||
210 | fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL); | |
211 | if (!fan) | |
212 | return_VALUE(-ENOMEM); | |
213 | memset(fan, 0, sizeof(struct acpi_fan)); | |
214 | ||
215 | fan->handle = device->handle; | |
216 | strcpy(acpi_device_name(device), ACPI_FAN_DEVICE_NAME); | |
217 | strcpy(acpi_device_class(device), ACPI_FAN_CLASS); | |
218 | acpi_driver_data(device) = fan; | |
219 | ||
220 | result = acpi_bus_get_power(fan->handle, &state); | |
221 | if (result) { | |
222 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
223 | "Error reading power state\n")); | |
224 | goto end; | |
225 | } | |
226 | ||
227 | result = acpi_fan_add_fs(device); | |
228 | if (result) | |
229 | goto end; | |
230 | ||
231 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", | |
232 | acpi_device_name(device), acpi_device_bid(device), | |
233 | !device->power.state?"on":"off"); | |
234 | ||
235 | end: | |
236 | if (result) | |
237 | kfree(fan); | |
238 | ||
239 | return_VALUE(result); | |
240 | } | |
241 | ||
242 | ||
243 | static int | |
244 | acpi_fan_remove ( | |
245 | struct acpi_device *device, | |
246 | int type) | |
247 | { | |
248 | struct acpi_fan *fan = NULL; | |
249 | ||
250 | ACPI_FUNCTION_TRACE("acpi_fan_remove"); | |
251 | ||
252 | if (!device || !acpi_driver_data(device)) | |
253 | return_VALUE(-EINVAL); | |
254 | ||
255 | fan = (struct acpi_fan *) acpi_driver_data(device); | |
256 | ||
257 | acpi_fan_remove_fs(device); | |
258 | ||
259 | kfree(fan); | |
260 | ||
261 | return_VALUE(0); | |
262 | } | |
263 | ||
264 | ||
265 | static int __init | |
266 | acpi_fan_init (void) | |
267 | { | |
268 | int result = 0; | |
269 | ||
270 | ACPI_FUNCTION_TRACE("acpi_fan_init"); | |
271 | ||
272 | acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir); | |
273 | if (!acpi_fan_dir) | |
274 | return_VALUE(-ENODEV); | |
275 | acpi_fan_dir->owner = THIS_MODULE; | |
276 | ||
277 | result = acpi_bus_register_driver(&acpi_fan_driver); | |
278 | if (result < 0) { | |
279 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
280 | return_VALUE(-ENODEV); | |
281 | } | |
282 | ||
283 | return_VALUE(0); | |
284 | } | |
285 | ||
286 | ||
287 | static void __exit | |
288 | acpi_fan_exit (void) | |
289 | { | |
290 | ACPI_FUNCTION_TRACE("acpi_fan_exit"); | |
291 | ||
292 | acpi_bus_unregister_driver(&acpi_fan_driver); | |
293 | ||
294 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
295 | ||
296 | return_VOID; | |
297 | } | |
298 | ||
299 | ||
300 | module_init(acpi_fan_init); | |
301 | module_exit(acpi_fan_exit); | |
302 |