blob: 53698ea0837139996e6ae845168cc6e3b2337bdf [file] [log] [blame]
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#define ACPI_FAN_CLASS "fan"
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#define ACPI_FAN_FILE_STATE "state"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40#define _COMPONENT ACPI_FAN_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050041ACPI_MODULE_NAME("fan");
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Len Brownf52fd662007-02-12 22:42:12 -050043MODULE_AUTHOR("Paul Diefenbaugh");
Len Brown7cda93e2007-02-12 23:50:02 -050044MODULE_DESCRIPTION("ACPI Fan Driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070045MODULE_LICENSE("GPL");
46
Len Brown4be44fc2005-08-05 00:44:28 -040047static int acpi_fan_add(struct acpi_device *device);
48static int acpi_fan_remove(struct acpi_device *device, int type);
Len Brownec683732008-01-23 22:41:20 -050049static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
50static int acpi_fan_resume(struct acpi_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Thomas Renninger1ba90e32007-07-23 14:44:41 +020052static const struct acpi_device_id fan_device_ids[] = {
53 {"PNP0C0B", 0},
54 {"", 0},
55};
56MODULE_DEVICE_TABLE(acpi, fan_device_ids);
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058static struct acpi_driver acpi_fan_driver = {
Len Brownc2b6705b2007-02-12 23:33:40 -050059 .name = "fan",
Len Brown4be44fc2005-08-05 00:44:28 -040060 .class = ACPI_FAN_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020061 .ids = fan_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040062 .ops = {
63 .add = acpi_fan_add,
64 .remove = acpi_fan_remove,
Len Brownec683732008-01-23 22:41:20 -050065 .suspend = acpi_fan_suspend,
66 .resume = acpi_fan_resume,
Len Brown4be44fc2005-08-05 00:44:28 -040067 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070068};
69
Zhang Rui05a83d92008-01-17 15:51:24 +080070/* thermal cooling device callbacks */
Matthew Garrett6503e5d2008-11-27 17:48:13 +000071static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
72 *state)
Zhang Rui05a83d92008-01-17 15:51:24 +080073{
74 /* ACPI fan device only support two states: ON/OFF */
Matthew Garrett6503e5d2008-11-27 17:48:13 +000075 *state = 1;
76 return 0;
Zhang Rui05a83d92008-01-17 15:51:24 +080077}
78
Matthew Garrett6503e5d2008-11-27 17:48:13 +000079static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
80 *state)
Zhang Rui05a83d92008-01-17 15:51:24 +080081{
82 struct acpi_device *device = cdev->devdata;
Zhang Rui05a83d92008-01-17 15:51:24 +080083 int result;
Matthew Garrett6503e5d2008-11-27 17:48:13 +000084 int acpi_state;
Zhang Rui05a83d92008-01-17 15:51:24 +080085
86 if (!device)
87 return -EINVAL;
88
Matthew Garrett6503e5d2008-11-27 17:48:13 +000089 result = acpi_bus_get_power(device->handle, &acpi_state);
Zhang Rui05a83d92008-01-17 15:51:24 +080090 if (result)
91 return result;
92
Matthew Garrett6503e5d2008-11-27 17:48:13 +000093 *state = (acpi_state == ACPI_STATE_D3 ? 0 :
94 (acpi_state == ACPI_STATE_D0 ? 1 : -1));
95 return 0;
Zhang Rui05a83d92008-01-17 15:51:24 +080096}
97
98static int
Matthew Garrett6503e5d2008-11-27 17:48:13 +000099fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
Zhang Rui05a83d92008-01-17 15:51:24 +0800100{
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
113static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119/* --------------------------------------------------------------------------
120 FS Interface (/proc)
121 -------------------------------------------------------------------------- */
Zhang Rui05a83d92008-01-17 15:51:24 +0800122#ifdef CONFIG_ACPI_PROCFS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Len Brown4be44fc2005-08-05 00:44:28 -0400124static struct proc_dir_entry *acpi_fan_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Len Brown4be44fc2005-08-05 00:44:28 -0400126static int acpi_fan_read_state(struct seq_file *seq, void *offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127{
Alexey Starikovskiy968fc5d2007-10-22 14:19:15 +0400128 struct acpi_device *device = seq->private;
Len Brown4be44fc2005-08-05 00:44:28 -0400129 int state = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Alexey Starikovskiy968fc5d2007-10-22 14:19:15 +0400132 if (device) {
133 if (acpi_bus_get_power(device->handle, &state))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 seq_printf(seq, "status: ERROR\n");
135 else
136 seq_printf(seq, "status: %s\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400137 !state ? "on" : "off");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400139 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140}
141
142static 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
147static ssize_t
Len Brown4be44fc2005-08-05 00:44:28 -0400148acpi_fan_write_state(struct file *file, const char __user * buffer,
149 size_t count, loff_t * ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
Len Brown4be44fc2005-08-05 00:44:28 -0400151 int result = 0;
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200152 struct seq_file *m = file->private_data;
Alexey Starikovskiy968fc5d2007-10-22 14:19:15 +0400153 struct acpi_device *device = m->private;
Yi Yang6594d872008-06-14 00:52:06 -0400154 char state_string[3] = { '\0' };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Alexey Starikovskiy968fc5d2007-10-22 14:19:15 +0400156 if (count > sizeof(state_string) - 1)
Patrick Mocheld550d982006-06-27 00:41:40 -0400157 return -EINVAL;
Len Brown4be44fc2005-08-05 00:44:28 -0400158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 if (copy_from_user(state_string, buffer, count))
Patrick Mocheld550d982006-06-27 00:41:40 -0400160 return -EFAULT;
Len Brown4be44fc2005-08-05 00:44:28 -0400161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 state_string[count] = '\0';
Yi Yang6594d872008-06-14 00:52:06 -0400163 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;
Len Brown4be44fc2005-08-05 00:44:28 -0400169
Alexey Starikovskiy968fc5d2007-10-22 14:19:15 +0400170 result = acpi_bus_set_power(device->handle,
Len Brown4be44fc2005-08-05 00:44:28 -0400171 simple_strtoul(state_string, NULL, 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 if (result)
Patrick Mocheld550d982006-06-27 00:41:40 -0400173 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Patrick Mocheld550d982006-06-27 00:41:40 -0400175 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176}
177
Arjan van de Vend7508032006-07-04 13:06:00 -0400178static const struct file_operations acpi_fan_state_ops = {
Len Brown4be44fc2005-08-05 00:44:28 -0400179 .open = acpi_fan_state_open_fs,
180 .read = seq_read,
181 .write = acpi_fan_write_state,
182 .llseek = seq_lseek,
183 .release = single_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 .owner = THIS_MODULE,
185};
186
Len Brown4be44fc2005-08-05 00:44:28 -0400187static int acpi_fan_add_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188{
Len Brown4be44fc2005-08-05 00:44:28 -0400189 struct proc_dir_entry *entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
192 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400193 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
195 if (!acpi_device_dir(device)) {
196 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400197 acpi_fan_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 if (!acpi_device_dir(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400199 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 }
201
202 /* 'status' [R/W] */
Denis V. Lunevcf7acfa2008-04-29 01:02:27 -0700203 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 if (!entry)
Patrick Mocheld550d982006-06-27 00:41:40 -0400209 return -ENODEV;
Patrick Mocheld550d982006-06-27 00:41:40 -0400210 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211}
212
Len Brown4be44fc2005-08-05 00:44:28 -0400213static int acpi_fan_remove_fs(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216 if (acpi_device_dir(device)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400217 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
219 acpi_device_dir(device) = NULL;
220 }
221
Patrick Mocheld550d982006-06-27 00:41:40 -0400222 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223}
Zhang Rui05a83d92008-01-17 15:51:24 +0800224#else
225static int acpi_fan_add_fs(struct acpi_device *device)
226{
227 return 0;
228}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
Zhang Rui05a83d92008-01-17 15:51:24 +0800230static int acpi_fan_remove_fs(struct acpi_device *device)
231{
232 return 0;
233}
234#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235/* --------------------------------------------------------------------------
236 Driver Interface
237 -------------------------------------------------------------------------- */
238
Len Brown4be44fc2005-08-05 00:44:28 -0400239static int acpi_fan_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240{
Len Brown4be44fc2005-08-05 00:44:28 -0400241 int result = 0;
Len Brown4be44fc2005-08-05 00:44:28 -0400242 int state = 0;
Zhang Rui05a83d92008-01-17 15:51:24 +0800243 struct thermal_cooling_device *cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
245 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400246 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Pavel Machekc65ade42005-08-05 00:37:45 -0400248 strcpy(acpi_device_name(device), "Fan");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
Patrick Mocheldc8c2b22006-05-19 16:54:42 -0400251 result = acpi_bus_get_power(device->handle, &state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400253 printk(KERN_ERR PREFIX "Reading power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 goto end;
255 }
256
Len Brownec683732008-01-23 22:41:20 -0500257 device->flags.force_power_state = 1;
258 acpi_bus_set_power(device->handle, state);
259 device->flags.force_power_state = 0;
260
Zhang Rui05a83d92008-01-17 15:51:24 +0800261 cdev = thermal_cooling_device_register("Fan", device,
262 &fan_cooling_ops);
Thomas Sujith19b36782008-02-15 01:01:52 -0500263 if (IS_ERR(cdev)) {
264 result = PTR_ERR(cdev);
265 goto end;
266 }
Zhang Rui05a83d92008-01-17 15:51:24 +0800267
Greg Kroah-Hartmanfc3a8822008-05-02 06:02:41 +0200268 dev_info(&device->dev, "registered as cooling_device%d\n", cdev->id);
Thomas Sujith19b36782008-02-15 01:01:52 -0500269
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700270 device->driver_data = cdev;
Julia Lawall90300622008-04-11 10:09:24 +0800271 result = sysfs_create_link(&device->dev.kobj,
272 &cdev->device.kobj,
273 "thermal_cooling");
274 if (result)
Greg Kroah-Hartmanfc3a8822008-05-02 06:02:41 +0200275 dev_err(&device->dev, "Failed to create sysfs link "
276 "'thermal_cooling'\n");
Julia Lawall90300622008-04-11 10:09:24 +0800277
278 result = sysfs_create_link(&cdev->device.kobj,
279 &device->dev.kobj,
280 "device");
281 if (result)
Greg Kroah-Hartmanfc3a8822008-05-02 06:02:41 +0200282 dev_err(&device->dev, "Failed to create sysfs link "
283 "'device'\n");
Zhang Rui05a83d92008-01-17 15:51:24 +0800284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 result = acpi_fan_add_fs(device);
286 if (result)
287 goto end;
288
289 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400290 acpi_device_name(device), acpi_device_bid(device),
291 !device->power.state ? "on" : "off");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Len Brown4be44fc2005-08-05 00:44:28 -0400293 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400294 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295}
296
Len Brown4be44fc2005-08-05 00:44:28 -0400297static int acpi_fan_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298{
Zhang Rui05a83d92008-01-17 15:51:24 +0800299 struct thermal_cooling_device *cdev = acpi_driver_data(device);
300
301 if (!device || !cdev)
Patrick Mocheld550d982006-06-27 00:41:40 -0400302 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 acpi_fan_remove_fs(device);
Zhang Rui05a83d92008-01-17 15:51:24 +0800305 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
306 sysfs_remove_link(&cdev->device.kobj, "device");
307 thermal_cooling_device_unregister(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Patrick Mocheld550d982006-06-27 00:41:40 -0400309 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310}
311
Len Brownec683732008-01-23 22:41:20 -0500312static 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
322static 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) {
Lin Ming55ac9a02008-09-28 14:51:56 +0800332 printk(KERN_ERR PREFIX
333 "Error reading fan power state\n");
Len Brownec683732008-01-23 22:41:20 -0500334 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
Len Brown4be44fc2005-08-05 00:44:28 -0400344static int __init acpi_fan_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345{
Pavel Machekc65ade42005-08-05 00:37:45 -0400346 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
Len Brown3c602842008-02-02 04:05:54 -0500349#ifdef CONFIG_ACPI_PROCFS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
351 if (!acpi_fan_dir)
Patrick Mocheld550d982006-06-27 00:41:40 -0400352 return -ENODEV;
Len Brown3c602842008-02-02 04:05:54 -0500353#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355 result = acpi_bus_register_driver(&acpi_fan_driver);
356 if (result < 0) {
357 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
Patrick Mocheld550d982006-06-27 00:41:40 -0400358 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 }
360
Patrick Mocheld550d982006-06-27 00:41:40 -0400361 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362}
363
Len Brown4be44fc2005-08-05 00:44:28 -0400364static void __exit acpi_fan_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
367 acpi_bus_unregister_driver(&acpi_fan_driver);
368
369 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
370
Patrick Mocheld550d982006-06-27 00:41:40 -0400371 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372}
373
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374module_init(acpi_fan_init);
375module_exit(acpi_fan_exit);