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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> | |
1da177e4 | 30 | #include <asm/uaccess.h> |
05a83d97 | 31 | #include <linux/thermal.h> |
1da177e4 LT |
32 | #include <acpi/acpi_bus.h> |
33 | #include <acpi/acpi_drivers.h> | |
34 | ||
a192a958 LB |
35 | #define PREFIX "ACPI: " |
36 | ||
1da177e4 | 37 | #define ACPI_FAN_CLASS "fan" |
1da177e4 | 38 | #define ACPI_FAN_FILE_STATE "state" |
1da177e4 LT |
39 | |
40 | #define _COMPONENT ACPI_FAN_COMPONENT | |
f52fd66d | 41 | ACPI_MODULE_NAME("fan"); |
1da177e4 | 42 | |
f52fd66d | 43 | MODULE_AUTHOR("Paul Diefenbaugh"); |
7cda93e0 | 44 | MODULE_DESCRIPTION("ACPI Fan Driver"); |
1da177e4 LT |
45 | MODULE_LICENSE("GPL"); |
46 | ||
4be44fcd LB |
47 | static int acpi_fan_add(struct acpi_device *device); |
48 | static int acpi_fan_remove(struct acpi_device *device, int type); | |
ec68373c LB |
49 | static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state); |
50 | static int acpi_fan_resume(struct acpi_device *device); | |
1da177e4 | 51 | |
1ba90e3a TR |
52 | static const struct acpi_device_id fan_device_ids[] = { |
53 | {"PNP0C0B", 0}, | |
54 | {"", 0}, | |
55 | }; | |
56 | MODULE_DEVICE_TABLE(acpi, fan_device_ids); | |
57 | ||
1da177e4 | 58 | static struct acpi_driver acpi_fan_driver = { |
c2b6705b | 59 | .name = "fan", |
4be44fcd | 60 | .class = ACPI_FAN_CLASS, |
1ba90e3a | 61 | .ids = fan_device_ids, |
4be44fcd LB |
62 | .ops = { |
63 | .add = acpi_fan_add, | |
64 | .remove = acpi_fan_remove, | |
ec68373c LB |
65 | .suspend = acpi_fan_suspend, |
66 | .resume = acpi_fan_resume, | |
4be44fcd | 67 | }, |
1da177e4 LT |
68 | }; |
69 | ||
05a83d97 | 70 | /* thermal cooling device callbacks */ |
6503e5df MG |
71 | static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long |
72 | *state) | |
05a83d97 ZR |
73 | { |
74 | /* ACPI fan device only support two states: ON/OFF */ | |
6503e5df MG |
75 | *state = 1; |
76 | return 0; | |
05a83d97 ZR |
77 | } |
78 | ||
6503e5df MG |
79 | static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long |
80 | *state) | |
05a83d97 ZR |
81 | { |
82 | struct acpi_device *device = cdev->devdata; | |
05a83d97 | 83 | int result; |
6503e5df | 84 | int acpi_state; |
05a83d97 ZR |
85 | |
86 | if (!device) | |
87 | return -EINVAL; | |
88 | ||
6503e5df | 89 | result = acpi_bus_get_power(device->handle, &acpi_state); |
05a83d97 ZR |
90 | if (result) |
91 | return result; | |
92 | ||
6503e5df MG |
93 | *state = (acpi_state == ACPI_STATE_D3 ? 0 : |
94 | (acpi_state == ACPI_STATE_D0 ? 1 : -1)); | |
95 | return 0; | |
05a83d97 ZR |
96 | } |
97 | ||
98 | static int | |
6503e5df | 99 | fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) |
05a83d97 ZR |
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 | ||
113 | static 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 | ||
1da177e4 LT |
119 | /* -------------------------------------------------------------------------- |
120 | Driver Interface | |
121 | -------------------------------------------------------------------------- */ | |
122 | ||
4be44fcd | 123 | static int acpi_fan_add(struct acpi_device *device) |
1da177e4 | 124 | { |
4be44fcd | 125 | int result = 0; |
4be44fcd | 126 | int state = 0; |
05a83d97 | 127 | struct thermal_cooling_device *cdev; |
1da177e4 LT |
128 | |
129 | if (!device) | |
d550d98d | 130 | return -EINVAL; |
1da177e4 | 131 | |
c65ade4d | 132 | strcpy(acpi_device_name(device), "Fan"); |
1da177e4 | 133 | strcpy(acpi_device_class(device), ACPI_FAN_CLASS); |
1da177e4 | 134 | |
dc8c2b27 | 135 | result = acpi_bus_get_power(device->handle, &state); |
1da177e4 | 136 | if (result) { |
6468463a | 137 | printk(KERN_ERR PREFIX "Reading power state\n"); |
1da177e4 LT |
138 | goto end; |
139 | } | |
140 | ||
ec68373c LB |
141 | device->flags.force_power_state = 1; |
142 | acpi_bus_set_power(device->handle, state); | |
143 | device->flags.force_power_state = 0; | |
144 | ||
05a83d97 ZR |
145 | cdev = thermal_cooling_device_register("Fan", device, |
146 | &fan_cooling_ops); | |
19b36780 TS |
147 | if (IS_ERR(cdev)) { |
148 | result = PTR_ERR(cdev); | |
149 | goto end; | |
150 | } | |
9030062f | 151 | |
13c41157 | 152 | dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id); |
9030062f | 153 | |
db89b4f0 | 154 | device->driver_data = cdev; |
9030062f JL |
155 | result = sysfs_create_link(&device->dev.kobj, |
156 | &cdev->device.kobj, | |
157 | "thermal_cooling"); | |
158 | if (result) | |
fc3a8828 GKH |
159 | dev_err(&device->dev, "Failed to create sysfs link " |
160 | "'thermal_cooling'\n"); | |
9030062f JL |
161 | |
162 | result = sysfs_create_link(&cdev->device.kobj, | |
163 | &device->dev.kobj, | |
164 | "device"); | |
165 | if (result) | |
fc3a8828 GKH |
166 | dev_err(&device->dev, "Failed to create sysfs link " |
167 | "'device'\n"); | |
05a83d97 | 168 | |
1da177e4 | 169 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", |
4be44fcd LB |
170 | acpi_device_name(device), acpi_device_bid(device), |
171 | !device->power.state ? "on" : "off"); | |
1da177e4 | 172 | |
4be44fcd | 173 | end: |
d550d98d | 174 | return result; |
1da177e4 LT |
175 | } |
176 | ||
4be44fcd | 177 | static int acpi_fan_remove(struct acpi_device *device, int type) |
1da177e4 | 178 | { |
05a83d97 ZR |
179 | struct thermal_cooling_device *cdev = acpi_driver_data(device); |
180 | ||
181 | if (!device || !cdev) | |
d550d98d | 182 | return -EINVAL; |
1da177e4 | 183 | |
05a83d97 ZR |
184 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); |
185 | sysfs_remove_link(&cdev->device.kobj, "device"); | |
186 | thermal_cooling_device_unregister(cdev); | |
1da177e4 | 187 | |
d550d98d | 188 | return 0; |
1da177e4 LT |
189 | } |
190 | ||
ec68373c LB |
191 | static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state) |
192 | { | |
193 | if (!device) | |
194 | return -EINVAL; | |
195 | ||
196 | acpi_bus_set_power(device->handle, ACPI_STATE_D0); | |
197 | ||
198 | return AE_OK; | |
199 | } | |
200 | ||
201 | static int acpi_fan_resume(struct acpi_device *device) | |
202 | { | |
203 | int result = 0; | |
204 | int power_state = 0; | |
205 | ||
206 | if (!device) | |
207 | return -EINVAL; | |
208 | ||
209 | result = acpi_bus_get_power(device->handle, &power_state); | |
210 | if (result) { | |
55ac9a01 LM |
211 | printk(KERN_ERR PREFIX |
212 | "Error reading fan power state\n"); | |
ec68373c LB |
213 | return result; |
214 | } | |
215 | ||
216 | device->flags.force_power_state = 1; | |
217 | acpi_bus_set_power(device->handle, power_state); | |
218 | device->flags.force_power_state = 0; | |
219 | ||
220 | return result; | |
221 | } | |
222 | ||
4be44fcd | 223 | static int __init acpi_fan_init(void) |
1da177e4 | 224 | { |
c65ade4d | 225 | int result = 0; |
1da177e4 | 226 | |
1da177e4 | 227 | result = acpi_bus_register_driver(&acpi_fan_driver); |
b2a44989 | 228 | if (result < 0) |
d550d98d | 229 | return -ENODEV; |
1da177e4 | 230 | |
d550d98d | 231 | return 0; |
1da177e4 LT |
232 | } |
233 | ||
4be44fcd | 234 | static void __exit acpi_fan_exit(void) |
1da177e4 | 235 | { |
1da177e4 LT |
236 | |
237 | acpi_bus_unregister_driver(&acpi_fan_driver); | |
238 | ||
d550d98d | 239 | return; |
1da177e4 LT |
240 | } |
241 | ||
1da177e4 LT |
242 | module_init(acpi_fan_init); |
243 | module_exit(acpi_fan_exit); |