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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 | |
f52fd66d | 43 | ACPI_MODULE_NAME("fan"); |
1da177e4 | 44 | |
f52fd66d | 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); | |
5d9464a4 PM |
51 | static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state); |
52 | static int acpi_fan_resume(struct acpi_device *device); | |
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 { | |
74b142e0 | 67 | struct acpi_device * device; |
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 | 80 | |
1da177e4 LT |
81 | |
82 | if (fan) { | |
dc8c2b27 | 83 | if (acpi_bus_get_power(fan->device->handle, &state)) |
1da177e4 LT |
84 | seq_printf(seq, "status: ERROR\n"); |
85 | else | |
86 | seq_printf(seq, "status: %s\n", | |
4be44fcd | 87 | !state ? "on" : "off"); |
1da177e4 | 88 | } |
d550d98d | 89 | return 0; |
1da177e4 LT |
90 | } |
91 | ||
92 | static int acpi_fan_state_open_fs(struct inode *inode, struct file *file) | |
93 | { | |
94 | return single_open(file, acpi_fan_read_state, PDE(inode)->data); | |
95 | } | |
96 | ||
97 | static ssize_t | |
4be44fcd LB |
98 | acpi_fan_write_state(struct file *file, const char __user * buffer, |
99 | size_t count, loff_t * ppos) | |
1da177e4 | 100 | { |
4be44fcd | 101 | int result = 0; |
50dd0969 JE |
102 | struct seq_file *m = file->private_data; |
103 | struct acpi_fan *fan = m->private; | |
4be44fcd | 104 | char state_string[12] = { '\0' }; |
1da177e4 | 105 | |
1da177e4 LT |
106 | |
107 | if (!fan || (count > sizeof(state_string) - 1)) | |
d550d98d | 108 | return -EINVAL; |
4be44fcd | 109 | |
1da177e4 | 110 | if (copy_from_user(state_string, buffer, count)) |
d550d98d | 111 | return -EFAULT; |
4be44fcd | 112 | |
1da177e4 | 113 | state_string[count] = '\0'; |
4be44fcd | 114 | |
dc8c2b27 | 115 | result = acpi_bus_set_power(fan->device->handle, |
4be44fcd | 116 | simple_strtoul(state_string, NULL, 0)); |
1da177e4 | 117 | if (result) |
d550d98d | 118 | return result; |
1da177e4 | 119 | |
d550d98d | 120 | return count; |
1da177e4 LT |
121 | } |
122 | ||
d7508032 | 123 | static const struct file_operations acpi_fan_state_ops = { |
4be44fcd LB |
124 | .open = acpi_fan_state_open_fs, |
125 | .read = seq_read, | |
126 | .write = acpi_fan_write_state, | |
127 | .llseek = seq_lseek, | |
128 | .release = single_release, | |
1da177e4 LT |
129 | .owner = THIS_MODULE, |
130 | }; | |
131 | ||
4be44fcd | 132 | static int acpi_fan_add_fs(struct acpi_device *device) |
1da177e4 | 133 | { |
4be44fcd | 134 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 135 | |
1da177e4 LT |
136 | |
137 | if (!device) | |
d550d98d | 138 | return -EINVAL; |
1da177e4 LT |
139 | |
140 | if (!acpi_device_dir(device)) { | |
141 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 142 | acpi_fan_dir); |
1da177e4 | 143 | if (!acpi_device_dir(device)) |
d550d98d | 144 | return -ENODEV; |
1da177e4 LT |
145 | acpi_device_dir(device)->owner = THIS_MODULE; |
146 | } | |
147 | ||
148 | /* 'status' [R/W] */ | |
149 | entry = create_proc_entry(ACPI_FAN_FILE_STATE, | |
4be44fcd LB |
150 | S_IFREG | S_IRUGO | S_IWUSR, |
151 | acpi_device_dir(device)); | |
1da177e4 | 152 | if (!entry) |
d550d98d | 153 | return -ENODEV; |
1da177e4 LT |
154 | else { |
155 | entry->proc_fops = &acpi_fan_state_ops; | |
156 | entry->data = acpi_driver_data(device); | |
157 | entry->owner = THIS_MODULE; | |
158 | } | |
159 | ||
d550d98d | 160 | return 0; |
1da177e4 LT |
161 | } |
162 | ||
4be44fcd | 163 | static int acpi_fan_remove_fs(struct acpi_device *device) |
1da177e4 | 164 | { |
1da177e4 LT |
165 | |
166 | if (acpi_device_dir(device)) { | |
4be44fcd | 167 | remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device)); |
1da177e4 LT |
168 | remove_proc_entry(acpi_device_bid(device), acpi_fan_dir); |
169 | acpi_device_dir(device) = NULL; | |
170 | } | |
171 | ||
d550d98d | 172 | return 0; |
1da177e4 LT |
173 | } |
174 | ||
1da177e4 LT |
175 | /* -------------------------------------------------------------------------- |
176 | Driver Interface | |
177 | -------------------------------------------------------------------------- */ | |
178 | ||
4be44fcd | 179 | static int acpi_fan_add(struct acpi_device *device) |
1da177e4 | 180 | { |
4be44fcd LB |
181 | int result = 0; |
182 | struct acpi_fan *fan = NULL; | |
183 | int state = 0; | |
1da177e4 | 184 | |
1da177e4 LT |
185 | |
186 | if (!device) | |
d550d98d | 187 | return -EINVAL; |
1da177e4 | 188 | |
36bcbec7 | 189 | fan = kzalloc(sizeof(struct acpi_fan), GFP_KERNEL); |
1da177e4 | 190 | if (!fan) |
d550d98d | 191 | return -ENOMEM; |
1da177e4 | 192 | |
74b142e0 | 193 | fan->device = device; |
c65ade4d | 194 | strcpy(acpi_device_name(device), "Fan"); |
1da177e4 LT |
195 | strcpy(acpi_device_class(device), ACPI_FAN_CLASS); |
196 | acpi_driver_data(device) = fan; | |
197 | ||
dc8c2b27 | 198 | result = acpi_bus_get_power(device->handle, &state); |
1da177e4 | 199 | if (result) { |
6468463a | 200 | printk(KERN_ERR PREFIX "Reading power state\n"); |
1da177e4 LT |
201 | goto end; |
202 | } | |
203 | ||
0feabb01 KK |
204 | device->flags.force_power_state = 1; |
205 | acpi_bus_set_power(device->handle, state); | |
206 | device->flags.force_power_state = 0; | |
207 | ||
1da177e4 LT |
208 | result = acpi_fan_add_fs(device); |
209 | if (result) | |
210 | goto end; | |
211 | ||
212 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", | |
4be44fcd LB |
213 | acpi_device_name(device), acpi_device_bid(device), |
214 | !device->power.state ? "on" : "off"); | |
1da177e4 | 215 | |
4be44fcd | 216 | end: |
1da177e4 LT |
217 | if (result) |
218 | kfree(fan); | |
219 | ||
d550d98d | 220 | return result; |
1da177e4 LT |
221 | } |
222 | ||
4be44fcd | 223 | static int acpi_fan_remove(struct acpi_device *device, int type) |
1da177e4 | 224 | { |
c65ade4d | 225 | struct acpi_fan *fan = NULL; |
1da177e4 | 226 | |
1da177e4 LT |
227 | |
228 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 229 | return -EINVAL; |
1da177e4 | 230 | |
50dd0969 | 231 | fan = acpi_driver_data(device); |
1da177e4 LT |
232 | |
233 | acpi_fan_remove_fs(device); | |
234 | ||
235 | kfree(fan); | |
236 | ||
d550d98d | 237 | return 0; |
1da177e4 LT |
238 | } |
239 | ||
5d9464a4 | 240 | static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state) |
0feabb01 KK |
241 | { |
242 | if (!device) | |
243 | return -EINVAL; | |
244 | ||
245 | acpi_bus_set_power(device->handle, ACPI_STATE_D0); | |
246 | ||
247 | return AE_OK; | |
248 | } | |
249 | ||
5d9464a4 | 250 | static int acpi_fan_resume(struct acpi_device *device) |
0feabb01 KK |
251 | { |
252 | int result = 0; | |
253 | int power_state = 0; | |
254 | ||
255 | if (!device) | |
256 | return -EINVAL; | |
257 | ||
258 | result = acpi_bus_get_power(device->handle, &power_state); | |
259 | if (result) { | |
260 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
261 | "Error reading fan power state\n")); | |
262 | return result; | |
263 | } | |
264 | ||
265 | device->flags.force_power_state = 1; | |
266 | acpi_bus_set_power(device->handle, power_state); | |
267 | device->flags.force_power_state = 0; | |
268 | ||
269 | return result; | |
270 | } | |
271 | ||
4be44fcd | 272 | static int __init acpi_fan_init(void) |
1da177e4 | 273 | { |
c65ade4d | 274 | int result = 0; |
1da177e4 | 275 | |
1da177e4 LT |
276 | |
277 | acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir); | |
278 | if (!acpi_fan_dir) | |
d550d98d | 279 | return -ENODEV; |
1da177e4 LT |
280 | acpi_fan_dir->owner = THIS_MODULE; |
281 | ||
282 | result = acpi_bus_register_driver(&acpi_fan_driver); | |
283 | if (result < 0) { | |
284 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
d550d98d | 285 | return -ENODEV; |
1da177e4 LT |
286 | } |
287 | ||
d550d98d | 288 | return 0; |
1da177e4 LT |
289 | } |
290 | ||
4be44fcd | 291 | static void __exit acpi_fan_exit(void) |
1da177e4 | 292 | { |
1da177e4 LT |
293 | |
294 | acpi_bus_unregister_driver(&acpi_fan_driver); | |
295 | ||
296 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
297 | ||
d550d98d | 298 | return; |
1da177e4 LT |
299 | } |
300 | ||
1da177e4 LT |
301 | module_init(acpi_fan_init); |
302 | module_exit(acpi_fan_exit); |