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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Zhang Rui05a83d92008-01-17 15:51:24 +080033#include <linux/thermal.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <acpi/acpi_bus.h>
35#include <acpi/acpi_drivers.h>
36
Len Browna192a952009-07-28 16:45:54 -040037#define PREFIX "ACPI: "
38
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#define ACPI_FAN_CLASS "fan"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#define ACPI_FAN_FILE_STATE "state"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42#define _COMPONENT ACPI_FAN_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050043ACPI_MODULE_NAME("fan");
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Len Brownf52fd662007-02-12 22:42:12 -050045MODULE_AUTHOR("Paul Diefenbaugh");
Len Brown7cda93e2007-02-12 23:50:02 -050046MODULE_DESCRIPTION("ACPI Fan Driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070047MODULE_LICENSE("GPL");
48
Len Brown4be44fc2005-08-05 00:44:28 -040049static int acpi_fan_add(struct acpi_device *device);
50static int acpi_fan_remove(struct acpi_device *device, int type);
Len Brownec683732008-01-23 22:41:20 -050051static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
52static int acpi_fan_resume(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Thomas Renninger1ba90e32007-07-23 14:44:41 +020054static const struct acpi_device_id fan_device_ids[] = {
55 {"PNP0C0B", 0},
56 {"", 0},
57};
58MODULE_DEVICE_TABLE(acpi, fan_device_ids);
59
Linus Torvalds1da177e2005-04-16 15:20:36 -070060static struct acpi_driver acpi_fan_driver = {
Len Brownc2b67052007-02-12 23:33:40 -050061 .name = "fan",
Len Brown4be44fc2005-08-05 00:44:28 -040062 .class = ACPI_FAN_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020063 .ids = fan_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040064 .ops = {
65 .add = acpi_fan_add,
66 .remove = acpi_fan_remove,
Len Brownec683732008-01-23 22:41:20 -050067 .suspend = acpi_fan_suspend,
68 .resume = acpi_fan_resume,
Len Brown4be44fc2005-08-05 00:44:28 -040069 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070070};
71
Zhang Rui05a83d92008-01-17 15:51:24 +080072/* thermal cooling device callbacks */
Matthew Garrett6503e5d2008-11-27 17:48:13 +000073static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
74 *state)
Zhang Rui05a83d92008-01-17 15:51:24 +080075{
76 /* ACPI fan device only support two states: ON/OFF */
Matthew Garrett6503e5d2008-11-27 17:48:13 +000077 *state = 1;
78 return 0;
Zhang Rui05a83d92008-01-17 15:51:24 +080079}
80
Matthew Garrett6503e5d2008-11-27 17:48:13 +000081static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
82 *state)
Zhang Rui05a83d92008-01-17 15:51:24 +080083{
84 struct acpi_device *device = cdev->devdata;
Zhang Rui05a83d92008-01-17 15:51:24 +080085 int result;
Matthew Garrett6503e5d2008-11-27 17:48:13 +000086 int acpi_state;
Zhang Rui05a83d92008-01-17 15:51:24 +080087
88 if (!device)
89 return -EINVAL;
90
Matthew Garrett6503e5d2008-11-27 17:48:13 +000091 result = acpi_bus_get_power(device->handle, &acpi_state);
Zhang Rui05a83d92008-01-17 15:51:24 +080092 if (result)
93 return result;
94
Matthew Garrett6503e5d2008-11-27 17:48:13 +000095 *state = (acpi_state == ACPI_STATE_D3 ? 0 :
96 (acpi_state == ACPI_STATE_D0 ? 1 : -1));
97 return 0;
Zhang Rui05a83d92008-01-17 15:51:24 +080098}
99
100static int
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000101fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
Zhang Rui05a83d92008-01-17 15:51:24 +0800102{
103 struct acpi_device *device = cdev->devdata;
104 int result;
105
106 if (!device || (state != 0 && state != 1))
107 return -EINVAL;
108
109 result = acpi_bus_set_power(device->handle,
110 state ? ACPI_STATE_D0 : ACPI_STATE_D3);
111
112 return result;
113}
114
115static struct thermal_cooling_device_ops fan_cooling_ops = {
116 .get_max_state = fan_get_max_state,
117 .get_cur_state = fan_get_cur_state,
118 .set_cur_state = fan_set_cur_state,
119};
120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121/* --------------------------------------------------------------------------
122 FS Interface (/proc)
123 -------------------------------------------------------------------------- */
Zhang Rui05a83d92008-01-17 15:51:24 +0800124#ifdef CONFIG_ACPI_PROCFS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Len Brown4be44fc2005-08-05 00:44:28 -0400126static struct proc_dir_entry *acpi_fan_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Len Brown4be44fc2005-08-05 00:44:28 -0400128static int acpi_fan_read_state(struct seq_file *seq, void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129{
Alexey Starikovskiy968fc5d2007-10-22 14:19:15 +0400130 struct acpi_device *device = seq->private;
Len Brown4be44fc2005-08-05 00:44:28 -0400131 int state = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Alexey Starikovskiy968fc5d2007-10-22 14:19:15 +0400134 if (device) {
135 if (acpi_bus_get_power(device->handle, &state))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 seq_printf(seq, "status: ERROR\n");
137 else
138 seq_printf(seq, "status: %s\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400139 !state ? "on" : "off");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400141 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142}
143
144static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
145{
146 return single_open(file, acpi_fan_read_state, PDE(inode)->data);
147}
148
149static ssize_t
Len Brown4be44fc2005-08-05 00:44:28 -0400150acpi_fan_write_state(struct file *file, const char __user * buffer,
151 size_t count, loff_t * ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
Len Brown4be44fc2005-08-05 00:44:28 -0400153 int result = 0;
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200154 struct seq_file *m = file->private_data;
Alexey Starikovskiy968fc5d2007-10-22 14:19:15 +0400155 struct acpi_device *device = m->private;
Yi Yang6594d872008-06-14 00:52:06 -0400156 char state_string[3] = { '\0' };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Alexey Starikovskiy968fc5d2007-10-22 14:19:15 +0400158 if (count > sizeof(state_string) - 1)
Patrick Mocheld550d982006-06-27 00:41:40 -0400159 return -EINVAL;
Len Brown4be44fc2005-08-05 00:44:28 -0400160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 if (copy_from_user(state_string, buffer, count))
Patrick Mocheld550d982006-06-27 00:41:40 -0400162 return -EFAULT;
Len Brown4be44fc2005-08-05 00:44:28 -0400163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 state_string[count] = '\0';
Yi Yang6594d872008-06-14 00:52:06 -0400165 if ((state_string[0] < '0') || (state_string[0] > '3'))
166 return -EINVAL;
167 if (state_string[1] == '\n')
168 state_string[1] = '\0';
169 if (state_string[1] != '\0')
170 return -EINVAL;
Len Brown4be44fc2005-08-05 00:44:28 -0400171
Alexey Starikovskiy968fc5d2007-10-22 14:19:15 +0400172 result = acpi_bus_set_power(device->handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400173 simple_strtoul(state_string, NULL, 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400175 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Patrick Mocheld550d982006-06-27 00:41:40 -0400177 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178}
179
Arjan van de Vend7508032006-07-04 13:06:00 -0400180static const struct file_operations acpi_fan_state_ops = {
Len Brown4be44fc2005-08-05 00:44:28 -0400181 .open = acpi_fan_state_open_fs,
182 .read = seq_read,
183 .write = acpi_fan_write_state,
184 .llseek = seq_lseek,
185 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 .owner = THIS_MODULE,
187};
188
Len Brown4be44fc2005-08-05 00:44:28 -0400189static int acpi_fan_add_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
Len Brown4be44fc2005-08-05 00:44:28 -0400191 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
194 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400195 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
197 if (!acpi_device_dir(device)) {
198 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400199 acpi_fan_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 if (!acpi_device_dir(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400201 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 }
203
204 /* 'status' [R/W] */
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700205 entry = proc_create_data(ACPI_FAN_FILE_STATE,
206 S_IFREG | S_IRUGO | S_IWUSR,
207 acpi_device_dir(device),
208 &acpi_fan_state_ops,
209 device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400211 return -ENODEV;
Patrick Mocheld550d982006-06-27 00:41:40 -0400212 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213}
214
Len Brown4be44fc2005-08-05 00:44:28 -0400215static int acpi_fan_remove_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
218 if (acpi_device_dir(device)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400219 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
221 acpi_device_dir(device) = NULL;
222 }
223
Patrick Mocheld550d982006-06-27 00:41:40 -0400224 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225}
Zhang Rui05a83d92008-01-17 15:51:24 +0800226#else
227static int acpi_fan_add_fs(struct acpi_device *device)
228{
229 return 0;
230}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
Zhang Rui05a83d92008-01-17 15:51:24 +0800232static int acpi_fan_remove_fs(struct acpi_device *device)
233{
234 return 0;
235}
236#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237/* --------------------------------------------------------------------------
238 Driver Interface
239 -------------------------------------------------------------------------- */
240
Len Brown4be44fc2005-08-05 00:44:28 -0400241static int acpi_fan_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242{
Len Brown4be44fc2005-08-05 00:44:28 -0400243 int result = 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400244 int state = 0;
Zhang Rui05a83d92008-01-17 15:51:24 +0800245 struct thermal_cooling_device *cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
247 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400248 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Pavel Machekc65ade42005-08-05 00:37:45 -0400250 strcpy(acpi_device_name(device), "Fan");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Patrick Mocheldc8c2b22006-05-19 16:54:42 -0400253 result = acpi_bus_get_power(device->handle, &state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400255 printk(KERN_ERR PREFIX "Reading power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 goto end;
257 }
258
Len Brownec683732008-01-23 22:41:20 -0500259 device->flags.force_power_state = 1;
260 acpi_bus_set_power(device->handle, state);
261 device->flags.force_power_state = 0;
262
Zhang Rui05a83d92008-01-17 15:51:24 +0800263 cdev = thermal_cooling_device_register("Fan", device,
264 &fan_cooling_ops);
Thomas Sujith19b36782008-02-15 01:01:52 -0500265 if (IS_ERR(cdev)) {
266 result = PTR_ERR(cdev);
267 goto end;
268 }
Zhang Rui05a83d92008-01-17 15:51:24 +0800269
Mike Travis13c41152009-12-14 13:38:30 -0800270 dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
Thomas Sujith19b36782008-02-15 01:01:52 -0500271
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700272 device->driver_data = cdev;
Julia Lawall90300622008-04-11 10:09:24 +0800273 result = sysfs_create_link(&device->dev.kobj,
274 &cdev->device.kobj,
275 "thermal_cooling");
276 if (result)
Greg Kroah-Hartmanfc3a8822008-05-02 06:02:41 +0200277 dev_err(&device->dev, "Failed to create sysfs link "
278 "'thermal_cooling'\n");
Julia Lawall90300622008-04-11 10:09:24 +0800279
280 result = sysfs_create_link(&cdev->device.kobj,
281 &device->dev.kobj,
282 "device");
283 if (result)
Greg Kroah-Hartmanfc3a8822008-05-02 06:02:41 +0200284 dev_err(&device->dev, "Failed to create sysfs link "
285 "'device'\n");
Zhang Rui05a83d92008-01-17 15:51:24 +0800286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 result = acpi_fan_add_fs(device);
288 if (result)
289 goto end;
290
291 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400292 acpi_device_name(device), acpi_device_bid(device),
293 !device->power.state ? "on" : "off");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
Len Brown4be44fc2005-08-05 00:44:28 -0400295 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400296 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297}
298
Len Brown4be44fc2005-08-05 00:44:28 -0400299static int acpi_fan_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
Zhang Rui05a83d92008-01-17 15:51:24 +0800301 struct thermal_cooling_device *cdev = acpi_driver_data(device);
302
303 if (!device || !cdev)
Patrick Mocheld550d982006-06-27 00:41:40 -0400304 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 acpi_fan_remove_fs(device);
Zhang Rui05a83d92008-01-17 15:51:24 +0800307 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
308 sysfs_remove_link(&cdev->device.kobj, "device");
309 thermal_cooling_device_unregister(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Patrick Mocheld550d982006-06-27 00:41:40 -0400311 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312}
313
Len Brownec683732008-01-23 22:41:20 -0500314static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
315{
316 if (!device)
317 return -EINVAL;
318
319 acpi_bus_set_power(device->handle, ACPI_STATE_D0);
320
321 return AE_OK;
322}
323
324static int acpi_fan_resume(struct acpi_device *device)
325{
326 int result = 0;
327 int power_state = 0;
328
329 if (!device)
330 return -EINVAL;
331
332 result = acpi_bus_get_power(device->handle, &power_state);
333 if (result) {
Lin Ming55ac9a02008-09-28 14:51:56 +0800334 printk(KERN_ERR PREFIX
335 "Error reading fan power state\n");
Len Brownec683732008-01-23 22:41:20 -0500336 return result;
337 }
338
339 device->flags.force_power_state = 1;
340 acpi_bus_set_power(device->handle, power_state);
341 device->flags.force_power_state = 0;
342
343 return result;
344}
345
Len Brown4be44fc2005-08-05 00:44:28 -0400346static int __init acpi_fan_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
Pavel Machekc65ade42005-08-05 00:37:45 -0400348 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
Len Brown3c602842008-02-02 04:05:54 -0500350#ifdef CONFIG_ACPI_PROCFS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
352 if (!acpi_fan_dir)
Patrick Mocheld550d982006-06-27 00:41:40 -0400353 return -ENODEV;
Len Brown3c602842008-02-02 04:05:54 -0500354#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
356 result = acpi_bus_register_driver(&acpi_fan_driver);
357 if (result < 0) {
Liang Li934231d2010-06-10 13:42:49 +0800358#ifdef CONFIG_ACPI_PROCFS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
Liang Li934231d2010-06-10 13:42:49 +0800360#endif
Patrick Mocheld550d982006-06-27 00:41:40 -0400361 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 }
363
Patrick Mocheld550d982006-06-27 00:41:40 -0400364 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365}
366
Len Brown4be44fc2005-08-05 00:44:28 -0400367static void __exit acpi_fan_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
370 acpi_bus_unregister_driver(&acpi_fan_driver);
371
372 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
373
Patrick Mocheld550d982006-06-27 00:41:40 -0400374 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375}
376
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377module_init(acpi_fan_init);
378module_exit(acpi_fan_exit);