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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 <asm/uaccess.h>
31#include <linux/thermal.h>
32#include <acpi/acpi_bus.h>
33#include <acpi/acpi_drivers.h>
34
35#define PREFIX "ACPI: "
36
37#define ACPI_FAN_CLASS "fan"
38#define ACPI_FAN_FILE_STATE "state"
39
40#define _COMPONENT ACPI_FAN_COMPONENT
41ACPI_MODULE_NAME("fan");
42
43MODULE_AUTHOR("Paul Diefenbaugh");
44MODULE_DESCRIPTION("ACPI Fan Driver");
45MODULE_LICENSE("GPL");
46
47static int acpi_fan_add(struct acpi_device *device);
48static int acpi_fan_remove(struct acpi_device *device, int type);
49static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
50static int acpi_fan_resume(struct acpi_device *device);
51
52static const struct acpi_device_id fan_device_ids[] = {
53 {"PNP0C0B", 0},
54 {"", 0},
55};
56MODULE_DEVICE_TABLE(acpi, fan_device_ids);
57
58static struct acpi_driver acpi_fan_driver = {
59 .name = "fan",
60 .class = ACPI_FAN_CLASS,
61 .ids = fan_device_ids,
62 .ops = {
63 .add = acpi_fan_add,
64 .remove = acpi_fan_remove,
65 .suspend = acpi_fan_suspend,
66 .resume = acpi_fan_resume,
67 },
68};
69
70/* thermal cooling device callbacks */
71static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
72 *state)
73{
74 /* ACPI fan device only support two states: ON/OFF */
75 *state = 1;
76 return 0;
77}
78
79static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
80 *state)
81{
82 struct acpi_device *device = cdev->devdata;
83 int result;
84 int acpi_state;
85
86 if (!device)
87 return -EINVAL;
88
89 result = acpi_bus_update_power(device->handle, &acpi_state);
90 if (result)
91 return result;
92
93 *state = (acpi_state == ACPI_STATE_D3 ? 0 :
94 (acpi_state == ACPI_STATE_D0 ? 1 : -1));
95 return 0;
96}
97
98static int
99fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
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
113static const 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
119/* --------------------------------------------------------------------------
120 Driver Interface
121 -------------------------------------------------------------------------- */
122
123static int acpi_fan_add(struct acpi_device *device)
124{
125 int result = 0;
126 struct thermal_cooling_device *cdev;
127
128 if (!device)
129 return -EINVAL;
130
131 strcpy(acpi_device_name(device), "Fan");
132 strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
133
134 result = acpi_bus_update_power(device->handle, NULL);
135 if (result) {
136 printk(KERN_ERR PREFIX "Setting initial power state\n");
137 goto end;
138 }
139
140 cdev = thermal_cooling_device_register("Fan", device,
141 &fan_cooling_ops);
142 if (IS_ERR(cdev)) {
143 result = PTR_ERR(cdev);
144 goto end;
145 }
146
147 dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
148
149 device->driver_data = cdev;
150 result = sysfs_create_link(&device->dev.kobj,
151 &cdev->device.kobj,
152 "thermal_cooling");
153 if (result)
154 dev_err(&device->dev, "Failed to create sysfs link "
155 "'thermal_cooling'\n");
156
157 result = sysfs_create_link(&cdev->device.kobj,
158 &device->dev.kobj,
159 "device");
160 if (result)
161 dev_err(&device->dev, "Failed to create sysfs link "
162 "'device'\n");
163
164 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
165 acpi_device_name(device), acpi_device_bid(device),
166 !device->power.state ? "on" : "off");
167
168 end:
169 return result;
170}
171
172static int acpi_fan_remove(struct acpi_device *device, int type)
173{
174 struct thermal_cooling_device *cdev = acpi_driver_data(device);
175
176 if (!device || !cdev)
177 return -EINVAL;
178
179 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
180 sysfs_remove_link(&cdev->device.kobj, "device");
181 thermal_cooling_device_unregister(cdev);
182
183 return 0;
184}
185
186static 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{
198 int result;
199
200 if (!device)
201 return -EINVAL;
202
203 result = acpi_bus_update_power(device->handle, NULL);
204 if (result)
205 printk(KERN_ERR PREFIX "Error updating fan power state\n");
206
207 return result;
208}
209
210static int __init acpi_fan_init(void)
211{
212 int result = 0;
213
214 result = acpi_bus_register_driver(&acpi_fan_driver);
215 if (result < 0)
216 return -ENODEV;
217
218 return 0;
219}
220
221static void __exit acpi_fan_exit(void)
222{
223
224 acpi_bus_unregister_driver(&acpi_fan_driver);
225
226 return;
227}
228
229module_init(acpi_fan_init);
230module_exit(acpi_fan_exit);
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 <asm/uaccess.h>
31#include <linux/thermal.h>
32#include <linux/acpi.h>
33
34#define PREFIX "ACPI: "
35
36#define ACPI_FAN_CLASS "fan"
37#define ACPI_FAN_FILE_STATE "state"
38
39#define _COMPONENT ACPI_FAN_COMPONENT
40ACPI_MODULE_NAME("fan");
41
42MODULE_AUTHOR("Paul Diefenbaugh");
43MODULE_DESCRIPTION("ACPI Fan Driver");
44MODULE_LICENSE("GPL");
45
46static int acpi_fan_add(struct acpi_device *device);
47static int acpi_fan_remove(struct acpi_device *device);
48
49static const struct acpi_device_id fan_device_ids[] = {
50 {"PNP0C0B", 0},
51 {"", 0},
52};
53MODULE_DEVICE_TABLE(acpi, fan_device_ids);
54
55#ifdef CONFIG_PM_SLEEP
56static int acpi_fan_suspend(struct device *dev);
57static int acpi_fan_resume(struct device *dev);
58static struct dev_pm_ops acpi_fan_pm = {
59 .resume = acpi_fan_resume,
60 .freeze = acpi_fan_suspend,
61 .thaw = acpi_fan_resume,
62 .restore = acpi_fan_resume,
63};
64#define FAN_PM_OPS_PTR (&acpi_fan_pm)
65#else
66#define FAN_PM_OPS_PTR NULL
67#endif
68
69static struct acpi_driver acpi_fan_driver = {
70 .name = "fan",
71 .class = ACPI_FAN_CLASS,
72 .ids = fan_device_ids,
73 .ops = {
74 .add = acpi_fan_add,
75 .remove = acpi_fan_remove,
76 },
77 .drv.pm = FAN_PM_OPS_PTR,
78};
79
80/* thermal cooling device callbacks */
81static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
82 *state)
83{
84 /* ACPI fan device only support two states: ON/OFF */
85 *state = 1;
86 return 0;
87}
88
89static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
90 *state)
91{
92 struct acpi_device *device = cdev->devdata;
93 int result;
94 int acpi_state = ACPI_STATE_D0;
95
96 if (!device)
97 return -EINVAL;
98
99 result = acpi_bus_update_power(device->handle, &acpi_state);
100 if (result)
101 return result;
102
103 *state = (acpi_state == ACPI_STATE_D3_COLD ? 0 :
104 (acpi_state == ACPI_STATE_D0 ? 1 : -1));
105 return 0;
106}
107
108static int
109fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
110{
111 struct acpi_device *device = cdev->devdata;
112 int result;
113
114 if (!device || (state != 0 && state != 1))
115 return -EINVAL;
116
117 result = acpi_bus_set_power(device->handle,
118 state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
119
120 return result;
121}
122
123static const struct thermal_cooling_device_ops fan_cooling_ops = {
124 .get_max_state = fan_get_max_state,
125 .get_cur_state = fan_get_cur_state,
126 .set_cur_state = fan_set_cur_state,
127};
128
129/* --------------------------------------------------------------------------
130 Driver Interface
131 -------------------------------------------------------------------------- */
132
133static int acpi_fan_add(struct acpi_device *device)
134{
135 int result = 0;
136 struct thermal_cooling_device *cdev;
137
138 if (!device)
139 return -EINVAL;
140
141 strcpy(acpi_device_name(device), "Fan");
142 strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
143
144 result = acpi_bus_update_power(device->handle, NULL);
145 if (result) {
146 printk(KERN_ERR PREFIX "Setting initial power state\n");
147 goto end;
148 }
149
150 cdev = thermal_cooling_device_register("Fan", device,
151 &fan_cooling_ops);
152 if (IS_ERR(cdev)) {
153 result = PTR_ERR(cdev);
154 goto end;
155 }
156
157 dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
158
159 device->driver_data = cdev;
160 result = sysfs_create_link(&device->dev.kobj,
161 &cdev->device.kobj,
162 "thermal_cooling");
163 if (result)
164 dev_err(&device->dev, "Failed to create sysfs link "
165 "'thermal_cooling'\n");
166
167 result = sysfs_create_link(&cdev->device.kobj,
168 &device->dev.kobj,
169 "device");
170 if (result)
171 dev_err(&device->dev, "Failed to create sysfs link "
172 "'device'\n");
173
174 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
175 acpi_device_name(device), acpi_device_bid(device),
176 !device->power.state ? "on" : "off");
177
178end:
179 return result;
180}
181
182static int acpi_fan_remove(struct acpi_device *device)
183{
184 struct thermal_cooling_device *cdev;
185
186 if (!device)
187 return -EINVAL;
188
189 cdev = acpi_driver_data(device);
190 if (!cdev)
191 return -EINVAL;
192
193 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
194 sysfs_remove_link(&cdev->device.kobj, "device");
195 thermal_cooling_device_unregister(cdev);
196
197 return 0;
198}
199
200#ifdef CONFIG_PM_SLEEP
201static int acpi_fan_suspend(struct device *dev)
202{
203 if (!dev)
204 return -EINVAL;
205
206 acpi_bus_set_power(to_acpi_device(dev)->handle, ACPI_STATE_D0);
207
208 return AE_OK;
209}
210
211static int acpi_fan_resume(struct device *dev)
212{
213 int result;
214
215 if (!dev)
216 return -EINVAL;
217
218 result = acpi_bus_update_power(to_acpi_device(dev)->handle, NULL);
219 if (result)
220 printk(KERN_ERR PREFIX "Error updating fan power state\n");
221
222 return result;
223}
224#endif
225
226module_acpi_driver(acpi_fan_driver);