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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <asm/uaccess.h>
Zhang Rui05a83d92008-01-17 15:51:24 +080031#include <linux/thermal.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <acpi/acpi_bus.h>
33#include <acpi/acpi_drivers.h>
34
Len Browna192a952009-07-28 16:45:54 -040035#define PREFIX "ACPI: "
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 Brownc2b67052007-02-12 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
Rafael J. Wysocki488a76c2010-11-25 00:11:24 +010089 result = acpi_bus_update_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/* --------------------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 Driver Interface
121 -------------------------------------------------------------------------- */
122
Len Brown4be44fc2005-08-05 00:44:28 -0400123static int acpi_fan_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
Len Brown4be44fc2005-08-05 00:44:28 -0400125 int result = 0;
Zhang Rui05a83d92008-01-17 15:51:24 +0800126 struct thermal_cooling_device *cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400129 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Pavel Machekc65ade42005-08-05 00:37:45 -0400131 strcpy(acpi_device_name(device), "Fan");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Rafael J. Wysocki488a76c2010-11-25 00:11:24 +0100134 result = acpi_bus_update_power(device->handle, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 if (result) {
Rafael J. Wysocki488a76c2010-11-25 00:11:24 +0100136 printk(KERN_ERR PREFIX "Setting initial power state\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 goto end;
138 }
139
Zhang Rui05a83d92008-01-17 15:51:24 +0800140 cdev = thermal_cooling_device_register("Fan", device,
141 &fan_cooling_ops);
Thomas Sujith19b36782008-02-15 01:01:52 -0500142 if (IS_ERR(cdev)) {
143 result = PTR_ERR(cdev);
144 goto end;
145 }
Zhang Rui05a83d92008-01-17 15:51:24 +0800146
Mike Travis13c41152009-12-14 13:38:30 -0800147 dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
Thomas Sujith19b36782008-02-15 01:01:52 -0500148
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700149 device->driver_data = cdev;
Julia Lawall90300622008-04-11 10:09:24 +0800150 result = sysfs_create_link(&device->dev.kobj,
151 &cdev->device.kobj,
152 "thermal_cooling");
153 if (result)
Greg Kroah-Hartmanfc3a8822008-05-02 06:02:41 +0200154 dev_err(&device->dev, "Failed to create sysfs link "
155 "'thermal_cooling'\n");
Julia Lawall90300622008-04-11 10:09:24 +0800156
157 result = sysfs_create_link(&cdev->device.kobj,
158 &device->dev.kobj,
159 "device");
160 if (result)
Greg Kroah-Hartmanfc3a8822008-05-02 06:02:41 +0200161 dev_err(&device->dev, "Failed to create sysfs link "
162 "'device'\n");
Zhang Rui05a83d92008-01-17 15:51:24 +0800163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400165 acpi_device_name(device), acpi_device_bid(device),
166 !device->power.state ? "on" : "off");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Len Brown4be44fc2005-08-05 00:44:28 -0400168 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400169 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
171
Len Brown4be44fc2005-08-05 00:44:28 -0400172static int acpi_fan_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173{
Zhang Rui05a83d92008-01-17 15:51:24 +0800174 struct thermal_cooling_device *cdev = acpi_driver_data(device);
175
176 if (!device || !cdev)
Patrick Mocheld550d982006-06-27 00:41:40 -0400177 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
Zhang Rui05a83d92008-01-17 15:51:24 +0800179 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
180 sysfs_remove_link(&cdev->device.kobj, "device");
181 thermal_cooling_device_unregister(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
Patrick Mocheld550d982006-06-27 00:41:40 -0400183 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184}
185
Len Brownec683732008-01-23 22:41:20 -0500186static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
187{
188 if (!device)
189 return -EINVAL;
190
191 acpi_bus_set_power(device->handle, ACPI_STATE_D0);
192
193 return AE_OK;
194}
195
196static int acpi_fan_resume(struct acpi_device *device)
197{
Rafael J. Wysocki488a76c2010-11-25 00:11:24 +0100198 int result;
Len Brownec683732008-01-23 22:41:20 -0500199
200 if (!device)
201 return -EINVAL;
202
Rafael J. Wysocki488a76c2010-11-25 00:11:24 +0100203 result = acpi_bus_update_power(device->handle, NULL);
204 if (result)
205 printk(KERN_ERR PREFIX "Error updating fan power state\n");
Len Brownec683732008-01-23 22:41:20 -0500206
207 return result;
208}
209
Len Brown4be44fc2005-08-05 00:44:28 -0400210static int __init acpi_fan_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211{
Pavel Machekc65ade42005-08-05 00:37:45 -0400212 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 result = acpi_bus_register_driver(&acpi_fan_driver);
Zhang Ruib2a44982010-10-08 13:55:03 +0800215 if (result < 0)
Patrick Mocheld550d982006-06-27 00:41:40 -0400216 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Patrick Mocheld550d982006-06-27 00:41:40 -0400218 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219}
220
Len Brown4be44fc2005-08-05 00:44:28 -0400221static void __exit acpi_fan_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224 acpi_bus_unregister_driver(&acpi_fan_driver);
225
Patrick Mocheld550d982006-06-27 00:41:40 -0400226 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227}
228
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229module_init(acpi_fan_init);
230module_exit(acpi_fan_exit);