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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> | |
05a83d97 | 33 | #include <linux/thermal.h> |
1da177e4 LT |
34 | #include <acpi/acpi_bus.h> |
35 | #include <acpi/acpi_drivers.h> | |
36 | ||
1da177e4 | 37 | #define ACPI_FAN_CLASS "fan" |
1da177e4 | 38 | #define ACPI_FAN_FILE_STATE "state" |
1da177e4 LT |
39 | |
40 | #define _COMPONENT ACPI_FAN_COMPONENT | |
f52fd66d | 41 | ACPI_MODULE_NAME("fan"); |
1da177e4 | 42 | |
f52fd66d | 43 | MODULE_AUTHOR("Paul Diefenbaugh"); |
7cda93e0 | 44 | MODULE_DESCRIPTION("ACPI Fan Driver"); |
1da177e4 LT |
45 | MODULE_LICENSE("GPL"); |
46 | ||
4be44fcd LB |
47 | static int acpi_fan_add(struct acpi_device *device); |
48 | static int acpi_fan_remove(struct acpi_device *device, int type); | |
ec68373c LB |
49 | static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state); |
50 | static int acpi_fan_resume(struct acpi_device *device); | |
1da177e4 | 51 | |
1ba90e3a TR |
52 | static const struct acpi_device_id fan_device_ids[] = { |
53 | {"PNP0C0B", 0}, | |
54 | {"", 0}, | |
55 | }; | |
56 | MODULE_DEVICE_TABLE(acpi, fan_device_ids); | |
57 | ||
1da177e4 | 58 | static struct acpi_driver acpi_fan_driver = { |
c2b6705b | 59 | .name = "fan", |
4be44fcd | 60 | .class = ACPI_FAN_CLASS, |
1ba90e3a | 61 | .ids = fan_device_ids, |
4be44fcd LB |
62 | .ops = { |
63 | .add = acpi_fan_add, | |
64 | .remove = acpi_fan_remove, | |
ec68373c LB |
65 | .suspend = acpi_fan_suspend, |
66 | .resume = acpi_fan_resume, | |
4be44fcd | 67 | }, |
1da177e4 LT |
68 | }; |
69 | ||
05a83d97 | 70 | /* thermal cooling device callbacks */ |
6503e5df MG |
71 | static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long |
72 | *state) | |
05a83d97 ZR |
73 | { |
74 | /* ACPI fan device only support two states: ON/OFF */ | |
6503e5df MG |
75 | *state = 1; |
76 | return 0; | |
05a83d97 ZR |
77 | } |
78 | ||
6503e5df MG |
79 | static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long |
80 | *state) | |
05a83d97 ZR |
81 | { |
82 | struct acpi_device *device = cdev->devdata; | |
05a83d97 | 83 | int result; |
6503e5df | 84 | int acpi_state; |
05a83d97 ZR |
85 | |
86 | if (!device) | |
87 | return -EINVAL; | |
88 | ||
6503e5df | 89 | result = acpi_bus_get_power(device->handle, &acpi_state); |
05a83d97 ZR |
90 | if (result) |
91 | return result; | |
92 | ||
6503e5df MG |
93 | *state = (acpi_state == ACPI_STATE_D3 ? 0 : |
94 | (acpi_state == ACPI_STATE_D0 ? 1 : -1)); | |
95 | return 0; | |
05a83d97 ZR |
96 | } |
97 | ||
98 | static int | |
6503e5df | 99 | fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) |
05a83d97 ZR |
100 | { |
101 | struct acpi_device *device = cdev->devdata; | |
102 | int result; | |
103 | ||
104 | if (!device || (state != 0 && state != 1)) | |
105 | return -EINVAL; | |
106 | ||
107 | result = acpi_bus_set_power(device->handle, | |
108 | state ? ACPI_STATE_D0 : ACPI_STATE_D3); | |
109 | ||
110 | return result; | |
111 | } | |
112 | ||
113 | static struct thermal_cooling_device_ops fan_cooling_ops = { | |
114 | .get_max_state = fan_get_max_state, | |
115 | .get_cur_state = fan_get_cur_state, | |
116 | .set_cur_state = fan_set_cur_state, | |
117 | }; | |
118 | ||
1da177e4 LT |
119 | /* -------------------------------------------------------------------------- |
120 | FS Interface (/proc) | |
121 | -------------------------------------------------------------------------- */ | |
05a83d97 | 122 | #ifdef CONFIG_ACPI_PROCFS |
1da177e4 | 123 | |
4be44fcd | 124 | static struct proc_dir_entry *acpi_fan_dir; |
1da177e4 | 125 | |
4be44fcd | 126 | static int acpi_fan_read_state(struct seq_file *seq, void *offset) |
1da177e4 | 127 | { |
968fc5dc | 128 | struct acpi_device *device = seq->private; |
4be44fcd | 129 | int state = 0; |
1da177e4 | 130 | |
1da177e4 | 131 | |
968fc5dc AS |
132 | if (device) { |
133 | if (acpi_bus_get_power(device->handle, &state)) | |
1da177e4 LT |
134 | seq_printf(seq, "status: ERROR\n"); |
135 | else | |
136 | seq_printf(seq, "status: %s\n", | |
4be44fcd | 137 | !state ? "on" : "off"); |
1da177e4 | 138 | } |
d550d98d | 139 | return 0; |
1da177e4 LT |
140 | } |
141 | ||
142 | static int acpi_fan_state_open_fs(struct inode *inode, struct file *file) | |
143 | { | |
144 | return single_open(file, acpi_fan_read_state, PDE(inode)->data); | |
145 | } | |
146 | ||
147 | static ssize_t | |
4be44fcd LB |
148 | acpi_fan_write_state(struct file *file, const char __user * buffer, |
149 | size_t count, loff_t * ppos) | |
1da177e4 | 150 | { |
4be44fcd | 151 | int result = 0; |
50dd0969 | 152 | struct seq_file *m = file->private_data; |
968fc5dc | 153 | struct acpi_device *device = m->private; |
6594d87e | 154 | char state_string[3] = { '\0' }; |
1da177e4 | 155 | |
968fc5dc | 156 | if (count > sizeof(state_string) - 1) |
d550d98d | 157 | return -EINVAL; |
4be44fcd | 158 | |
1da177e4 | 159 | if (copy_from_user(state_string, buffer, count)) |
d550d98d | 160 | return -EFAULT; |
4be44fcd | 161 | |
1da177e4 | 162 | state_string[count] = '\0'; |
6594d87e YY |
163 | if ((state_string[0] < '0') || (state_string[0] > '3')) |
164 | return -EINVAL; | |
165 | if (state_string[1] == '\n') | |
166 | state_string[1] = '\0'; | |
167 | if (state_string[1] != '\0') | |
168 | return -EINVAL; | |
4be44fcd | 169 | |
968fc5dc | 170 | result = acpi_bus_set_power(device->handle, |
4be44fcd | 171 | simple_strtoul(state_string, NULL, 0)); |
1da177e4 | 172 | if (result) |
d550d98d | 173 | return result; |
1da177e4 | 174 | |
d550d98d | 175 | return count; |
1da177e4 LT |
176 | } |
177 | ||
d7508032 | 178 | static const struct file_operations acpi_fan_state_ops = { |
4be44fcd LB |
179 | .open = acpi_fan_state_open_fs, |
180 | .read = seq_read, | |
181 | .write = acpi_fan_write_state, | |
182 | .llseek = seq_lseek, | |
183 | .release = single_release, | |
1da177e4 LT |
184 | .owner = THIS_MODULE, |
185 | }; | |
186 | ||
4be44fcd | 187 | static int acpi_fan_add_fs(struct acpi_device *device) |
1da177e4 | 188 | { |
4be44fcd | 189 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 190 | |
1da177e4 LT |
191 | |
192 | if (!device) | |
d550d98d | 193 | return -EINVAL; |
1da177e4 LT |
194 | |
195 | if (!acpi_device_dir(device)) { | |
196 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 197 | acpi_fan_dir); |
1da177e4 | 198 | if (!acpi_device_dir(device)) |
d550d98d | 199 | return -ENODEV; |
1da177e4 LT |
200 | } |
201 | ||
202 | /* 'status' [R/W] */ | |
cf7acfab DL |
203 | entry = proc_create_data(ACPI_FAN_FILE_STATE, |
204 | S_IFREG | S_IRUGO | S_IWUSR, | |
205 | acpi_device_dir(device), | |
206 | &acpi_fan_state_ops, | |
207 | device); | |
1da177e4 | 208 | if (!entry) |
d550d98d | 209 | return -ENODEV; |
d550d98d | 210 | return 0; |
1da177e4 LT |
211 | } |
212 | ||
4be44fcd | 213 | static int acpi_fan_remove_fs(struct acpi_device *device) |
1da177e4 | 214 | { |
1da177e4 LT |
215 | |
216 | if (acpi_device_dir(device)) { | |
4be44fcd | 217 | remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device)); |
1da177e4 LT |
218 | remove_proc_entry(acpi_device_bid(device), acpi_fan_dir); |
219 | acpi_device_dir(device) = NULL; | |
220 | } | |
221 | ||
d550d98d | 222 | return 0; |
1da177e4 | 223 | } |
05a83d97 ZR |
224 | #else |
225 | static int acpi_fan_add_fs(struct acpi_device *device) | |
226 | { | |
227 | return 0; | |
228 | } | |
1da177e4 | 229 | |
05a83d97 ZR |
230 | static int acpi_fan_remove_fs(struct acpi_device *device) |
231 | { | |
232 | return 0; | |
233 | } | |
234 | #endif | |
1da177e4 LT |
235 | /* -------------------------------------------------------------------------- |
236 | Driver Interface | |
237 | -------------------------------------------------------------------------- */ | |
238 | ||
4be44fcd | 239 | static int acpi_fan_add(struct acpi_device *device) |
1da177e4 | 240 | { |
4be44fcd | 241 | int result = 0; |
4be44fcd | 242 | int state = 0; |
05a83d97 | 243 | struct thermal_cooling_device *cdev; |
1da177e4 LT |
244 | |
245 | if (!device) | |
d550d98d | 246 | return -EINVAL; |
1da177e4 | 247 | |
c65ade4d | 248 | strcpy(acpi_device_name(device), "Fan"); |
1da177e4 | 249 | strcpy(acpi_device_class(device), ACPI_FAN_CLASS); |
1da177e4 | 250 | |
dc8c2b27 | 251 | result = acpi_bus_get_power(device->handle, &state); |
1da177e4 | 252 | if (result) { |
6468463a | 253 | printk(KERN_ERR PREFIX "Reading power state\n"); |
1da177e4 LT |
254 | goto end; |
255 | } | |
256 | ||
ec68373c LB |
257 | device->flags.force_power_state = 1; |
258 | acpi_bus_set_power(device->handle, state); | |
259 | device->flags.force_power_state = 0; | |
260 | ||
05a83d97 ZR |
261 | cdev = thermal_cooling_device_register("Fan", device, |
262 | &fan_cooling_ops); | |
19b36780 TS |
263 | if (IS_ERR(cdev)) { |
264 | result = PTR_ERR(cdev); | |
265 | goto end; | |
266 | } | |
9030062f | 267 | |
fc3a8828 | 268 | dev_info(&device->dev, "registered as cooling_device%d\n", cdev->id); |
9030062f | 269 | |
db89b4f0 | 270 | device->driver_data = cdev; |
9030062f JL |
271 | result = sysfs_create_link(&device->dev.kobj, |
272 | &cdev->device.kobj, | |
273 | "thermal_cooling"); | |
274 | if (result) | |
fc3a8828 GKH |
275 | dev_err(&device->dev, "Failed to create sysfs link " |
276 | "'thermal_cooling'\n"); | |
9030062f JL |
277 | |
278 | result = sysfs_create_link(&cdev->device.kobj, | |
279 | &device->dev.kobj, | |
280 | "device"); | |
281 | if (result) | |
fc3a8828 GKH |
282 | dev_err(&device->dev, "Failed to create sysfs link " |
283 | "'device'\n"); | |
05a83d97 | 284 | |
1da177e4 LT |
285 | result = acpi_fan_add_fs(device); |
286 | if (result) | |
287 | goto end; | |
288 | ||
289 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", | |
4be44fcd LB |
290 | acpi_device_name(device), acpi_device_bid(device), |
291 | !device->power.state ? "on" : "off"); | |
1da177e4 | 292 | |
4be44fcd | 293 | end: |
d550d98d | 294 | return result; |
1da177e4 LT |
295 | } |
296 | ||
4be44fcd | 297 | static int acpi_fan_remove(struct acpi_device *device, int type) |
1da177e4 | 298 | { |
05a83d97 ZR |
299 | struct thermal_cooling_device *cdev = acpi_driver_data(device); |
300 | ||
301 | if (!device || !cdev) | |
d550d98d | 302 | return -EINVAL; |
1da177e4 | 303 | |
1da177e4 | 304 | acpi_fan_remove_fs(device); |
05a83d97 ZR |
305 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); |
306 | sysfs_remove_link(&cdev->device.kobj, "device"); | |
307 | thermal_cooling_device_unregister(cdev); | |
1da177e4 | 308 | |
d550d98d | 309 | return 0; |
1da177e4 LT |
310 | } |
311 | ||
ec68373c LB |
312 | static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state) |
313 | { | |
314 | if (!device) | |
315 | return -EINVAL; | |
316 | ||
317 | acpi_bus_set_power(device->handle, ACPI_STATE_D0); | |
318 | ||
319 | return AE_OK; | |
320 | } | |
321 | ||
322 | static int acpi_fan_resume(struct acpi_device *device) | |
323 | { | |
324 | int result = 0; | |
325 | int power_state = 0; | |
326 | ||
327 | if (!device) | |
328 | return -EINVAL; | |
329 | ||
330 | result = acpi_bus_get_power(device->handle, &power_state); | |
331 | if (result) { | |
55ac9a01 LM |
332 | printk(KERN_ERR PREFIX |
333 | "Error reading fan power state\n"); | |
ec68373c LB |
334 | return result; |
335 | } | |
336 | ||
337 | device->flags.force_power_state = 1; | |
338 | acpi_bus_set_power(device->handle, power_state); | |
339 | device->flags.force_power_state = 0; | |
340 | ||
341 | return result; | |
342 | } | |
343 | ||
4be44fcd | 344 | static int __init acpi_fan_init(void) |
1da177e4 | 345 | { |
c65ade4d | 346 | int result = 0; |
1da177e4 | 347 | |
1da177e4 | 348 | |
3c602840 | 349 | #ifdef CONFIG_ACPI_PROCFS |
1da177e4 LT |
350 | acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir); |
351 | if (!acpi_fan_dir) | |
d550d98d | 352 | return -ENODEV; |
3c602840 | 353 | #endif |
1da177e4 LT |
354 | |
355 | result = acpi_bus_register_driver(&acpi_fan_driver); | |
356 | if (result < 0) { | |
357 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
d550d98d | 358 | return -ENODEV; |
1da177e4 LT |
359 | } |
360 | ||
d550d98d | 361 | return 0; |
1da177e4 LT |
362 | } |
363 | ||
4be44fcd | 364 | static void __exit acpi_fan_exit(void) |
1da177e4 | 365 | { |
1da177e4 LT |
366 | |
367 | acpi_bus_unregister_driver(&acpi_fan_driver); | |
368 | ||
369 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
370 | ||
d550d98d | 371 | return; |
1da177e4 LT |
372 | } |
373 | ||
1da177e4 LT |
374 | module_init(acpi_fan_init); |
375 | module_exit(acpi_fan_exit); |