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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 | ||
1da177e4 LT |
37 | #define ACPI_FAN_COMPONENT 0x00200000 |
38 | #define ACPI_FAN_CLASS "fan" | |
1da177e4 | 39 | #define ACPI_FAN_DRIVER_NAME "ACPI Fan Driver" |
1da177e4 | 40 | #define ACPI_FAN_FILE_STATE "state" |
1da177e4 LT |
41 | |
42 | #define _COMPONENT ACPI_FAN_COMPONENT | |
4be44fcd | 43 | ACPI_MODULE_NAME("acpi_fan") |
1da177e4 | 44 | |
4be44fcd | 45 | MODULE_AUTHOR("Paul Diefenbaugh"); |
1da177e4 LT |
46 | MODULE_DESCRIPTION(ACPI_FAN_DRIVER_NAME); |
47 | MODULE_LICENSE("GPL"); | |
48 | ||
4be44fcd LB |
49 | static int acpi_fan_add(struct acpi_device *device); |
50 | static int acpi_fan_remove(struct acpi_device *device, int type); | |
0feabb01 KK |
51 | static int acpi_fan_suspend(struct acpi_device *device, int state); |
52 | static int acpi_fan_resume(struct acpi_device *device, int state); | |
1da177e4 LT |
53 | |
54 | static struct acpi_driver acpi_fan_driver = { | |
4be44fcd LB |
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, | |
0feabb01 KK |
61 | .suspend = acpi_fan_suspend, |
62 | .resume = acpi_fan_resume, | |
4be44fcd | 63 | }, |
1da177e4 LT |
64 | }; |
65 | ||
66 | struct acpi_fan { | |
4be44fcd | 67 | acpi_handle handle; |
1da177e4 LT |
68 | }; |
69 | ||
1da177e4 LT |
70 | /* -------------------------------------------------------------------------- |
71 | FS Interface (/proc) | |
72 | -------------------------------------------------------------------------- */ | |
73 | ||
4be44fcd | 74 | static struct proc_dir_entry *acpi_fan_dir; |
1da177e4 | 75 | |
4be44fcd | 76 | static int acpi_fan_read_state(struct seq_file *seq, void *offset) |
1da177e4 | 77 | { |
4be44fcd LB |
78 | struct acpi_fan *fan = seq->private; |
79 | int state = 0; | |
1da177e4 LT |
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", | |
4be44fcd | 88 | !state ? "on" : "off"); |
1da177e4 LT |
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 | |
4be44fcd LB |
99 | acpi_fan_write_state(struct file *file, const char __user * buffer, |
100 | size_t count, loff_t * ppos) | |
1da177e4 | 101 | { |
4be44fcd LB |
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' }; | |
1da177e4 LT |
106 | |
107 | ACPI_FUNCTION_TRACE("acpi_fan_write_state"); | |
108 | ||
109 | if (!fan || (count > sizeof(state_string) - 1)) | |
110 | return_VALUE(-EINVAL); | |
4be44fcd | 111 | |
1da177e4 LT |
112 | if (copy_from_user(state_string, buffer, count)) |
113 | return_VALUE(-EFAULT); | |
4be44fcd | 114 | |
1da177e4 | 115 | state_string[count] = '\0'; |
4be44fcd LB |
116 | |
117 | result = acpi_bus_set_power(fan->handle, | |
118 | simple_strtoul(state_string, NULL, 0)); | |
1da177e4 LT |
119 | if (result) |
120 | return_VALUE(result); | |
121 | ||
122 | return_VALUE(count); | |
123 | } | |
124 | ||
125 | static struct file_operations acpi_fan_state_ops = { | |
4be44fcd LB |
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, | |
1da177e4 LT |
131 | .owner = THIS_MODULE, |
132 | }; | |
133 | ||
4be44fcd | 134 | static int acpi_fan_add_fs(struct acpi_device *device) |
1da177e4 | 135 | { |
4be44fcd | 136 | struct proc_dir_entry *entry = NULL; |
1da177e4 LT |
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), | |
4be44fcd | 145 | acpi_fan_dir); |
1da177e4 LT |
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, | |
4be44fcd LB |
153 | S_IFREG | S_IRUGO | S_IWUSR, |
154 | acpi_device_dir(device)); | |
1da177e4 | 155 | if (!entry) |
a6fc6720 | 156 | return_VALUE(-ENODEV); |
1da177e4 LT |
157 | else { |
158 | entry->proc_fops = &acpi_fan_state_ops; | |
159 | entry->data = acpi_driver_data(device); | |
160 | entry->owner = THIS_MODULE; | |
161 | } | |
162 | ||
163 | return_VALUE(0); | |
164 | } | |
165 | ||
4be44fcd | 166 | static int acpi_fan_remove_fs(struct acpi_device *device) |
1da177e4 LT |
167 | { |
168 | ACPI_FUNCTION_TRACE("acpi_fan_remove_fs"); | |
169 | ||
170 | if (acpi_device_dir(device)) { | |
4be44fcd | 171 | remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device)); |
1da177e4 LT |
172 | remove_proc_entry(acpi_device_bid(device), acpi_fan_dir); |
173 | acpi_device_dir(device) = NULL; | |
174 | } | |
175 | ||
176 | return_VALUE(0); | |
177 | } | |
178 | ||
1da177e4 LT |
179 | /* -------------------------------------------------------------------------- |
180 | Driver Interface | |
181 | -------------------------------------------------------------------------- */ | |
182 | ||
4be44fcd | 183 | static int acpi_fan_add(struct acpi_device *device) |
1da177e4 | 184 | { |
4be44fcd LB |
185 | int result = 0; |
186 | struct acpi_fan *fan = NULL; | |
187 | int state = 0; | |
1da177e4 LT |
188 | |
189 | ACPI_FUNCTION_TRACE("acpi_fan_add"); | |
190 | ||
191 | if (!device) | |
192 | return_VALUE(-EINVAL); | |
193 | ||
194 | fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL); | |
195 | if (!fan) | |
196 | return_VALUE(-ENOMEM); | |
197 | memset(fan, 0, sizeof(struct acpi_fan)); | |
198 | ||
199 | fan->handle = device->handle; | |
c65ade4d | 200 | strcpy(acpi_device_name(device), "Fan"); |
1da177e4 LT |
201 | strcpy(acpi_device_class(device), ACPI_FAN_CLASS); |
202 | acpi_driver_data(device) = fan; | |
203 | ||
204 | result = acpi_bus_get_power(fan->handle, &state); | |
205 | if (result) { | |
a6fc6720 | 206 | ACPI_ERROR((AE_INFO, "Reading power state")); |
1da177e4 LT |
207 | goto end; |
208 | } | |
209 | ||
0feabb01 KK |
210 | device->flags.force_power_state = 1; |
211 | acpi_bus_set_power(device->handle, state); | |
212 | device->flags.force_power_state = 0; | |
213 | ||
1da177e4 LT |
214 | result = acpi_fan_add_fs(device); |
215 | if (result) | |
216 | goto end; | |
217 | ||
218 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", | |
4be44fcd LB |
219 | acpi_device_name(device), acpi_device_bid(device), |
220 | !device->power.state ? "on" : "off"); | |
1da177e4 | 221 | |
4be44fcd | 222 | end: |
1da177e4 LT |
223 | if (result) |
224 | kfree(fan); | |
225 | ||
226 | return_VALUE(result); | |
227 | } | |
228 | ||
4be44fcd | 229 | static int acpi_fan_remove(struct acpi_device *device, int type) |
1da177e4 | 230 | { |
c65ade4d | 231 | struct acpi_fan *fan = NULL; |
1da177e4 LT |
232 | |
233 | ACPI_FUNCTION_TRACE("acpi_fan_remove"); | |
234 | ||
235 | if (!device || !acpi_driver_data(device)) | |
236 | return_VALUE(-EINVAL); | |
237 | ||
4be44fcd | 238 | fan = (struct acpi_fan *)acpi_driver_data(device); |
1da177e4 LT |
239 | |
240 | acpi_fan_remove_fs(device); | |
241 | ||
242 | kfree(fan); | |
243 | ||
244 | return_VALUE(0); | |
245 | } | |
246 | ||
0feabb01 KK |
247 | static int acpi_fan_suspend(struct acpi_device *device, int state) |
248 | { | |
249 | if (!device) | |
250 | return -EINVAL; | |
251 | ||
252 | acpi_bus_set_power(device->handle, ACPI_STATE_D0); | |
253 | ||
254 | return AE_OK; | |
255 | } | |
256 | ||
257 | static int acpi_fan_resume(struct acpi_device *device, int state) | |
258 | { | |
259 | int result = 0; | |
260 | int power_state = 0; | |
261 | ||
262 | if (!device) | |
263 | return -EINVAL; | |
264 | ||
265 | result = acpi_bus_get_power(device->handle, &power_state); | |
266 | if (result) { | |
267 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
268 | "Error reading fan power state\n")); | |
269 | return result; | |
270 | } | |
271 | ||
272 | device->flags.force_power_state = 1; | |
273 | acpi_bus_set_power(device->handle, power_state); | |
274 | device->flags.force_power_state = 0; | |
275 | ||
276 | return result; | |
277 | } | |
278 | ||
4be44fcd | 279 | static int __init acpi_fan_init(void) |
1da177e4 | 280 | { |
c65ade4d | 281 | int result = 0; |
1da177e4 LT |
282 | |
283 | ACPI_FUNCTION_TRACE("acpi_fan_init"); | |
284 | ||
285 | acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir); | |
286 | if (!acpi_fan_dir) | |
287 | return_VALUE(-ENODEV); | |
288 | acpi_fan_dir->owner = THIS_MODULE; | |
289 | ||
290 | result = acpi_bus_register_driver(&acpi_fan_driver); | |
291 | if (result < 0) { | |
292 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
293 | return_VALUE(-ENODEV); | |
294 | } | |
295 | ||
296 | return_VALUE(0); | |
297 | } | |
298 | ||
4be44fcd | 299 | static void __exit acpi_fan_exit(void) |
1da177e4 LT |
300 | { |
301 | ACPI_FUNCTION_TRACE("acpi_fan_exit"); | |
302 | ||
303 | acpi_bus_unregister_driver(&acpi_fan_driver); | |
304 | ||
305 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
306 | ||
307 | return_VOID; | |
308 | } | |
309 | ||
1da177e4 LT |
310 | module_init(acpi_fan_init); |
311 | module_exit(acpi_fan_exit); |