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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" | |
1da177e4 | 40 | #define ACPI_FAN_DRIVER_NAME "ACPI Fan Driver" |
1da177e4 | 41 | #define ACPI_FAN_FILE_STATE "state" |
1da177e4 LT |
42 | |
43 | #define _COMPONENT ACPI_FAN_COMPONENT | |
44 | ACPI_MODULE_NAME ("acpi_fan") | |
45 | ||
46 | MODULE_AUTHOR("Paul Diefenbaugh"); | |
47 | MODULE_DESCRIPTION(ACPI_FAN_DRIVER_NAME); | |
48 | MODULE_LICENSE("GPL"); | |
49 | ||
50 | static int acpi_fan_add (struct acpi_device *device); | |
51 | static int acpi_fan_remove (struct acpi_device *device, int type); | |
52 | ||
53 | static struct acpi_driver acpi_fan_driver = { | |
54 | .name = ACPI_FAN_DRIVER_NAME, | |
55 | .class = ACPI_FAN_CLASS, | |
c65ade4d | 56 | .ids = "PNP0C0B", |
1da177e4 LT |
57 | .ops = { |
58 | .add = acpi_fan_add, | |
59 | .remove = acpi_fan_remove, | |
60 | }, | |
61 | }; | |
62 | ||
63 | struct acpi_fan { | |
64 | acpi_handle handle; | |
65 | }; | |
66 | ||
67 | ||
68 | /* -------------------------------------------------------------------------- | |
69 | FS Interface (/proc) | |
70 | -------------------------------------------------------------------------- */ | |
71 | ||
72 | static struct proc_dir_entry *acpi_fan_dir; | |
73 | ||
74 | ||
75 | static int | |
c65ade4d | 76 | acpi_fan_read_state(struct seq_file *seq, void *offset) |
1da177e4 LT |
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 | |
c65ade4d PM |
99 | acpi_fan_write_state(struct file *file, const char __user *buffer, |
100 | size_t count, loff_t *ppos) | |
1da177e4 LT |
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 | |
c65ade4d | 135 | acpi_fan_add_fs(struct acpi_device *device) |
1da177e4 LT |
136 | { |
137 | struct proc_dir_entry *entry = NULL; | |
138 | ||
139 | ACPI_FUNCTION_TRACE("acpi_fan_add_fs"); | |
140 | ||
141 | if (!device) | |
142 | return_VALUE(-EINVAL); | |
143 | ||
144 | if (!acpi_device_dir(device)) { | |
145 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
146 | acpi_fan_dir); | |
147 | if (!acpi_device_dir(device)) | |
148 | return_VALUE(-ENODEV); | |
149 | acpi_device_dir(device)->owner = THIS_MODULE; | |
150 | } | |
151 | ||
152 | /* 'status' [R/W] */ | |
153 | entry = create_proc_entry(ACPI_FAN_FILE_STATE, | |
154 | S_IFREG|S_IRUGO|S_IWUSR, 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 | ||
169 | static int | |
c65ade4d | 170 | acpi_fan_remove_fs(struct acpi_device *device) |
1da177e4 LT |
171 | { |
172 | ACPI_FUNCTION_TRACE("acpi_fan_remove_fs"); | |
173 | ||
174 | if (acpi_device_dir(device)) { | |
175 | remove_proc_entry(ACPI_FAN_FILE_STATE, | |
176 | acpi_device_dir(device)); | |
177 | remove_proc_entry(acpi_device_bid(device), acpi_fan_dir); | |
178 | acpi_device_dir(device) = NULL; | |
179 | } | |
180 | ||
181 | return_VALUE(0); | |
182 | } | |
183 | ||
184 | ||
185 | /* -------------------------------------------------------------------------- | |
186 | Driver Interface | |
187 | -------------------------------------------------------------------------- */ | |
188 | ||
189 | static int | |
c65ade4d | 190 | acpi_fan_add(struct acpi_device *device) |
1da177e4 LT |
191 | { |
192 | int result = 0; | |
193 | struct acpi_fan *fan = NULL; | |
194 | int state = 0; | |
195 | ||
196 | ACPI_FUNCTION_TRACE("acpi_fan_add"); | |
197 | ||
198 | if (!device) | |
199 | return_VALUE(-EINVAL); | |
200 | ||
201 | fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL); | |
202 | if (!fan) | |
203 | return_VALUE(-ENOMEM); | |
204 | memset(fan, 0, sizeof(struct acpi_fan)); | |
205 | ||
206 | fan->handle = device->handle; | |
c65ade4d | 207 | strcpy(acpi_device_name(device), "Fan"); |
1da177e4 LT |
208 | strcpy(acpi_device_class(device), ACPI_FAN_CLASS); |
209 | acpi_driver_data(device) = fan; | |
210 | ||
211 | result = acpi_bus_get_power(fan->handle, &state); | |
212 | if (result) { | |
213 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
214 | "Error reading power state\n")); | |
215 | goto end; | |
216 | } | |
217 | ||
218 | result = acpi_fan_add_fs(device); | |
219 | if (result) | |
220 | goto end; | |
221 | ||
222 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", | |
223 | acpi_device_name(device), acpi_device_bid(device), | |
224 | !device->power.state?"on":"off"); | |
225 | ||
226 | end: | |
227 | if (result) | |
228 | kfree(fan); | |
229 | ||
230 | return_VALUE(result); | |
231 | } | |
232 | ||
233 | ||
234 | static int | |
c65ade4d | 235 | acpi_fan_remove(struct acpi_device *device, int type) |
1da177e4 | 236 | { |
c65ade4d | 237 | struct acpi_fan *fan = NULL; |
1da177e4 LT |
238 | |
239 | ACPI_FUNCTION_TRACE("acpi_fan_remove"); | |
240 | ||
241 | if (!device || !acpi_driver_data(device)) | |
242 | return_VALUE(-EINVAL); | |
243 | ||
244 | fan = (struct acpi_fan *) acpi_driver_data(device); | |
245 | ||
246 | acpi_fan_remove_fs(device); | |
247 | ||
248 | kfree(fan); | |
249 | ||
250 | return_VALUE(0); | |
251 | } | |
252 | ||
253 | ||
254 | static int __init | |
c65ade4d | 255 | acpi_fan_init(void) |
1da177e4 | 256 | { |
c65ade4d | 257 | int result = 0; |
1da177e4 LT |
258 | |
259 | ACPI_FUNCTION_TRACE("acpi_fan_init"); | |
260 | ||
261 | acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir); | |
262 | if (!acpi_fan_dir) | |
263 | return_VALUE(-ENODEV); | |
264 | acpi_fan_dir->owner = THIS_MODULE; | |
265 | ||
266 | result = acpi_bus_register_driver(&acpi_fan_driver); | |
267 | if (result < 0) { | |
268 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
269 | return_VALUE(-ENODEV); | |
270 | } | |
271 | ||
272 | return_VALUE(0); | |
273 | } | |
274 | ||
275 | ||
276 | static void __exit | |
c65ade4d | 277 | acpi_fan_exit(void) |
1da177e4 LT |
278 | { |
279 | ACPI_FUNCTION_TRACE("acpi_fan_exit"); | |
280 | ||
281 | acpi_bus_unregister_driver(&acpi_fan_driver); | |
282 | ||
283 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
284 | ||
285 | return_VOID; | |
286 | } | |
287 | ||
288 | ||
289 | module_init(acpi_fan_init); | |
290 | module_exit(acpi_fan_exit); | |
291 |