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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 LT |
37 | #define ACPI_FAN_COMPONENT 0x00200000 |
38 | #define ACPI_FAN_CLASS "fan" | |
1da177e4 | 39 | #define ACPI_FAN_FILE_STATE "state" |
1da177e4 LT |
40 | |
41 | #define _COMPONENT ACPI_FAN_COMPONENT | |
f52fd66d | 42 | ACPI_MODULE_NAME("fan"); |
1da177e4 | 43 | |
f52fd66d | 44 | MODULE_AUTHOR("Paul Diefenbaugh"); |
7cda93e0 | 45 | MODULE_DESCRIPTION("ACPI Fan Driver"); |
1da177e4 LT |
46 | MODULE_LICENSE("GPL"); |
47 | ||
4be44fcd LB |
48 | static int acpi_fan_add(struct acpi_device *device); |
49 | static int acpi_fan_remove(struct acpi_device *device, int type); | |
ec68373c LB |
50 | static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state); |
51 | static int acpi_fan_resume(struct acpi_device *device); | |
1da177e4 | 52 | |
1ba90e3a TR |
53 | static const struct acpi_device_id fan_device_ids[] = { |
54 | {"PNP0C0B", 0}, | |
55 | {"", 0}, | |
56 | }; | |
57 | MODULE_DEVICE_TABLE(acpi, fan_device_ids); | |
58 | ||
1da177e4 | 59 | static struct acpi_driver acpi_fan_driver = { |
c2b6705b | 60 | .name = "fan", |
4be44fcd | 61 | .class = ACPI_FAN_CLASS, |
1ba90e3a | 62 | .ids = fan_device_ids, |
4be44fcd LB |
63 | .ops = { |
64 | .add = acpi_fan_add, | |
65 | .remove = acpi_fan_remove, | |
ec68373c LB |
66 | .suspend = acpi_fan_suspend, |
67 | .resume = acpi_fan_resume, | |
4be44fcd | 68 | }, |
1da177e4 LT |
69 | }; |
70 | ||
05a83d97 ZR |
71 | /* thermal cooling device callbacks */ |
72 | static int fan_get_max_state(struct thermal_cooling_device *cdev, char *buf) | |
73 | { | |
74 | /* ACPI fan device only support two states: ON/OFF */ | |
75 | return sprintf(buf, "1\n"); | |
76 | } | |
77 | ||
78 | static int fan_get_cur_state(struct thermal_cooling_device *cdev, char *buf) | |
79 | { | |
80 | struct acpi_device *device = cdev->devdata; | |
81 | int state; | |
82 | int result; | |
83 | ||
84 | if (!device) | |
85 | return -EINVAL; | |
86 | ||
87 | result = acpi_bus_get_power(device->handle, &state); | |
88 | if (result) | |
89 | return result; | |
90 | ||
91 | return sprintf(buf, "%s\n", state == ACPI_STATE_D3 ? "0" : | |
92 | (state == ACPI_STATE_D0 ? "1" : "unknown")); | |
93 | } | |
94 | ||
95 | static int | |
96 | fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state) | |
97 | { | |
98 | struct acpi_device *device = cdev->devdata; | |
99 | int result; | |
100 | ||
101 | if (!device || (state != 0 && state != 1)) | |
102 | return -EINVAL; | |
103 | ||
104 | result = acpi_bus_set_power(device->handle, | |
105 | state ? ACPI_STATE_D0 : ACPI_STATE_D3); | |
106 | ||
107 | return result; | |
108 | } | |
109 | ||
110 | static struct thermal_cooling_device_ops fan_cooling_ops = { | |
111 | .get_max_state = fan_get_max_state, | |
112 | .get_cur_state = fan_get_cur_state, | |
113 | .set_cur_state = fan_set_cur_state, | |
114 | }; | |
115 | ||
1da177e4 LT |
116 | /* -------------------------------------------------------------------------- |
117 | FS Interface (/proc) | |
118 | -------------------------------------------------------------------------- */ | |
05a83d97 | 119 | #ifdef CONFIG_ACPI_PROCFS |
1da177e4 | 120 | |
4be44fcd | 121 | static struct proc_dir_entry *acpi_fan_dir; |
1da177e4 | 122 | |
4be44fcd | 123 | static int acpi_fan_read_state(struct seq_file *seq, void *offset) |
1da177e4 | 124 | { |
968fc5dc | 125 | struct acpi_device *device = seq->private; |
4be44fcd | 126 | int state = 0; |
1da177e4 | 127 | |
1da177e4 | 128 | |
968fc5dc AS |
129 | if (device) { |
130 | if (acpi_bus_get_power(device->handle, &state)) | |
1da177e4 LT |
131 | seq_printf(seq, "status: ERROR\n"); |
132 | else | |
133 | seq_printf(seq, "status: %s\n", | |
4be44fcd | 134 | !state ? "on" : "off"); |
1da177e4 | 135 | } |
d550d98d | 136 | return 0; |
1da177e4 LT |
137 | } |
138 | ||
139 | static int acpi_fan_state_open_fs(struct inode *inode, struct file *file) | |
140 | { | |
141 | return single_open(file, acpi_fan_read_state, PDE(inode)->data); | |
142 | } | |
143 | ||
144 | static ssize_t | |
4be44fcd LB |
145 | acpi_fan_write_state(struct file *file, const char __user * buffer, |
146 | size_t count, loff_t * ppos) | |
1da177e4 | 147 | { |
4be44fcd | 148 | int result = 0; |
50dd0969 | 149 | struct seq_file *m = file->private_data; |
968fc5dc | 150 | struct acpi_device *device = m->private; |
6594d87e | 151 | char state_string[3] = { '\0' }; |
1da177e4 | 152 | |
968fc5dc | 153 | if (count > sizeof(state_string) - 1) |
d550d98d | 154 | return -EINVAL; |
4be44fcd | 155 | |
1da177e4 | 156 | if (copy_from_user(state_string, buffer, count)) |
d550d98d | 157 | return -EFAULT; |
4be44fcd | 158 | |
1da177e4 | 159 | state_string[count] = '\0'; |
6594d87e YY |
160 | if ((state_string[0] < '0') || (state_string[0] > '3')) |
161 | return -EINVAL; | |
162 | if (state_string[1] == '\n') | |
163 | state_string[1] = '\0'; | |
164 | if (state_string[1] != '\0') | |
165 | return -EINVAL; | |
4be44fcd | 166 | |
968fc5dc | 167 | result = acpi_bus_set_power(device->handle, |
4be44fcd | 168 | simple_strtoul(state_string, NULL, 0)); |
1da177e4 | 169 | if (result) |
d550d98d | 170 | return result; |
1da177e4 | 171 | |
d550d98d | 172 | return count; |
1da177e4 LT |
173 | } |
174 | ||
d7508032 | 175 | static const struct file_operations acpi_fan_state_ops = { |
4be44fcd LB |
176 | .open = acpi_fan_state_open_fs, |
177 | .read = seq_read, | |
178 | .write = acpi_fan_write_state, | |
179 | .llseek = seq_lseek, | |
180 | .release = single_release, | |
1da177e4 LT |
181 | .owner = THIS_MODULE, |
182 | }; | |
183 | ||
4be44fcd | 184 | static int acpi_fan_add_fs(struct acpi_device *device) |
1da177e4 | 185 | { |
4be44fcd | 186 | struct proc_dir_entry *entry = NULL; |
1da177e4 | 187 | |
1da177e4 LT |
188 | |
189 | if (!device) | |
d550d98d | 190 | return -EINVAL; |
1da177e4 LT |
191 | |
192 | if (!acpi_device_dir(device)) { | |
193 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), | |
4be44fcd | 194 | acpi_fan_dir); |
1da177e4 | 195 | if (!acpi_device_dir(device)) |
d550d98d | 196 | return -ENODEV; |
1da177e4 LT |
197 | acpi_device_dir(device)->owner = THIS_MODULE; |
198 | } | |
199 | ||
200 | /* 'status' [R/W] */ | |
cf7acfab DL |
201 | entry = proc_create_data(ACPI_FAN_FILE_STATE, |
202 | S_IFREG | S_IRUGO | S_IWUSR, | |
203 | acpi_device_dir(device), | |
204 | &acpi_fan_state_ops, | |
205 | device); | |
1da177e4 | 206 | if (!entry) |
d550d98d | 207 | return -ENODEV; |
d550d98d | 208 | return 0; |
1da177e4 LT |
209 | } |
210 | ||
4be44fcd | 211 | static int acpi_fan_remove_fs(struct acpi_device *device) |
1da177e4 | 212 | { |
1da177e4 LT |
213 | |
214 | if (acpi_device_dir(device)) { | |
4be44fcd | 215 | remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device)); |
1da177e4 LT |
216 | remove_proc_entry(acpi_device_bid(device), acpi_fan_dir); |
217 | acpi_device_dir(device) = NULL; | |
218 | } | |
219 | ||
d550d98d | 220 | return 0; |
1da177e4 | 221 | } |
05a83d97 ZR |
222 | #else |
223 | static int acpi_fan_add_fs(struct acpi_device *device) | |
224 | { | |
225 | return 0; | |
226 | } | |
1da177e4 | 227 | |
05a83d97 ZR |
228 | static int acpi_fan_remove_fs(struct acpi_device *device) |
229 | { | |
230 | return 0; | |
231 | } | |
232 | #endif | |
1da177e4 LT |
233 | /* -------------------------------------------------------------------------- |
234 | Driver Interface | |
235 | -------------------------------------------------------------------------- */ | |
236 | ||
4be44fcd | 237 | static int acpi_fan_add(struct acpi_device *device) |
1da177e4 | 238 | { |
4be44fcd | 239 | int result = 0; |
4be44fcd | 240 | int state = 0; |
05a83d97 | 241 | struct thermal_cooling_device *cdev; |
1da177e4 LT |
242 | |
243 | if (!device) | |
d550d98d | 244 | return -EINVAL; |
1da177e4 | 245 | |
c65ade4d | 246 | strcpy(acpi_device_name(device), "Fan"); |
1da177e4 | 247 | strcpy(acpi_device_class(device), ACPI_FAN_CLASS); |
1da177e4 | 248 | |
dc8c2b27 | 249 | result = acpi_bus_get_power(device->handle, &state); |
1da177e4 | 250 | if (result) { |
6468463a | 251 | printk(KERN_ERR PREFIX "Reading power state\n"); |
1da177e4 LT |
252 | goto end; |
253 | } | |
254 | ||
ec68373c LB |
255 | device->flags.force_power_state = 1; |
256 | acpi_bus_set_power(device->handle, state); | |
257 | device->flags.force_power_state = 0; | |
258 | ||
05a83d97 ZR |
259 | cdev = thermal_cooling_device_register("Fan", device, |
260 | &fan_cooling_ops); | |
19b36780 TS |
261 | if (IS_ERR(cdev)) { |
262 | result = PTR_ERR(cdev); | |
263 | goto end; | |
264 | } | |
9030062f | 265 | |
fc3a8828 | 266 | dev_info(&device->dev, "registered as cooling_device%d\n", cdev->id); |
9030062f JL |
267 | |
268 | acpi_driver_data(device) = cdev; | |
269 | result = sysfs_create_link(&device->dev.kobj, | |
270 | &cdev->device.kobj, | |
271 | "thermal_cooling"); | |
272 | if (result) | |
fc3a8828 GKH |
273 | dev_err(&device->dev, "Failed to create sysfs link " |
274 | "'thermal_cooling'\n"); | |
9030062f JL |
275 | |
276 | result = sysfs_create_link(&cdev->device.kobj, | |
277 | &device->dev.kobj, | |
278 | "device"); | |
279 | if (result) | |
fc3a8828 GKH |
280 | dev_err(&device->dev, "Failed to create sysfs link " |
281 | "'device'\n"); | |
05a83d97 | 282 | |
1da177e4 LT |
283 | result = acpi_fan_add_fs(device); |
284 | if (result) | |
285 | goto end; | |
286 | ||
287 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", | |
4be44fcd LB |
288 | acpi_device_name(device), acpi_device_bid(device), |
289 | !device->power.state ? "on" : "off"); | |
1da177e4 | 290 | |
4be44fcd | 291 | end: |
d550d98d | 292 | return result; |
1da177e4 LT |
293 | } |
294 | ||
4be44fcd | 295 | static int acpi_fan_remove(struct acpi_device *device, int type) |
1da177e4 | 296 | { |
05a83d97 ZR |
297 | struct thermal_cooling_device *cdev = acpi_driver_data(device); |
298 | ||
299 | if (!device || !cdev) | |
d550d98d | 300 | return -EINVAL; |
1da177e4 | 301 | |
1da177e4 | 302 | acpi_fan_remove_fs(device); |
05a83d97 ZR |
303 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); |
304 | sysfs_remove_link(&cdev->device.kobj, "device"); | |
305 | thermal_cooling_device_unregister(cdev); | |
1da177e4 | 306 | |
d550d98d | 307 | return 0; |
1da177e4 LT |
308 | } |
309 | ||
ec68373c LB |
310 | static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state) |
311 | { | |
312 | if (!device) | |
313 | return -EINVAL; | |
314 | ||
315 | acpi_bus_set_power(device->handle, ACPI_STATE_D0); | |
316 | ||
317 | return AE_OK; | |
318 | } | |
319 | ||
320 | static int acpi_fan_resume(struct acpi_device *device) | |
321 | { | |
322 | int result = 0; | |
323 | int power_state = 0; | |
324 | ||
325 | if (!device) | |
326 | return -EINVAL; | |
327 | ||
328 | result = acpi_bus_get_power(device->handle, &power_state); | |
329 | if (result) { | |
330 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
331 | "Error reading fan power state\n")); | |
332 | return result; | |
333 | } | |
334 | ||
335 | device->flags.force_power_state = 1; | |
336 | acpi_bus_set_power(device->handle, power_state); | |
337 | device->flags.force_power_state = 0; | |
338 | ||
339 | return result; | |
340 | } | |
341 | ||
4be44fcd | 342 | static int __init acpi_fan_init(void) |
1da177e4 | 343 | { |
c65ade4d | 344 | int result = 0; |
1da177e4 | 345 | |
1da177e4 | 346 | |
3c602840 | 347 | #ifdef CONFIG_ACPI_PROCFS |
1da177e4 LT |
348 | acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir); |
349 | if (!acpi_fan_dir) | |
d550d98d | 350 | return -ENODEV; |
1da177e4 | 351 | acpi_fan_dir->owner = THIS_MODULE; |
3c602840 | 352 | #endif |
1da177e4 LT |
353 | |
354 | result = acpi_bus_register_driver(&acpi_fan_driver); | |
355 | if (result < 0) { | |
356 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
d550d98d | 357 | return -ENODEV; |
1da177e4 LT |
358 | } |
359 | ||
d550d98d | 360 | return 0; |
1da177e4 LT |
361 | } |
362 | ||
4be44fcd | 363 | static void __exit acpi_fan_exit(void) |
1da177e4 | 364 | { |
1da177e4 LT |
365 | |
366 | acpi_bus_unregister_driver(&acpi_fan_driver); | |
367 | ||
368 | remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir); | |
369 | ||
d550d98d | 370 | return; |
1da177e4 LT |
371 | } |
372 | ||
1da177e4 LT |
373 | module_init(acpi_fan_init); |
374 | module_exit(acpi_fan_exit); |