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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 | ||
488a76c5 | 89 | result = acpi_bus_update_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; |
05a83d97 | 126 | struct thermal_cooling_device *cdev; |
1da177e4 LT |
127 | |
128 | if (!device) | |
d550d98d | 129 | return -EINVAL; |
1da177e4 | 130 | |
c65ade4d | 131 | strcpy(acpi_device_name(device), "Fan"); |
1da177e4 | 132 | strcpy(acpi_device_class(device), ACPI_FAN_CLASS); |
1da177e4 | 133 | |
488a76c5 | 134 | result = acpi_bus_update_power(device->handle, NULL); |
1da177e4 | 135 | if (result) { |
488a76c5 | 136 | printk(KERN_ERR PREFIX "Setting initial power state\n"); |
1da177e4 LT |
137 | goto end; |
138 | } | |
139 | ||
05a83d97 ZR |
140 | cdev = thermal_cooling_device_register("Fan", device, |
141 | &fan_cooling_ops); | |
19b36780 TS |
142 | if (IS_ERR(cdev)) { |
143 | result = PTR_ERR(cdev); | |
144 | goto end; | |
145 | } | |
9030062f | 146 | |
13c41157 | 147 | dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id); |
9030062f | 148 | |
db89b4f0 | 149 | device->driver_data = cdev; |
9030062f JL |
150 | result = sysfs_create_link(&device->dev.kobj, |
151 | &cdev->device.kobj, | |
152 | "thermal_cooling"); | |
153 | if (result) | |
fc3a8828 GKH |
154 | dev_err(&device->dev, "Failed to create sysfs link " |
155 | "'thermal_cooling'\n"); | |
9030062f JL |
156 | |
157 | result = sysfs_create_link(&cdev->device.kobj, | |
158 | &device->dev.kobj, | |
159 | "device"); | |
160 | if (result) | |
fc3a8828 GKH |
161 | dev_err(&device->dev, "Failed to create sysfs link " |
162 | "'device'\n"); | |
05a83d97 | 163 | |
1da177e4 | 164 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", |
4be44fcd LB |
165 | acpi_device_name(device), acpi_device_bid(device), |
166 | !device->power.state ? "on" : "off"); | |
1da177e4 | 167 | |
4be44fcd | 168 | end: |
d550d98d | 169 | return result; |
1da177e4 LT |
170 | } |
171 | ||
4be44fcd | 172 | static int acpi_fan_remove(struct acpi_device *device, int type) |
1da177e4 | 173 | { |
05a83d97 ZR |
174 | struct thermal_cooling_device *cdev = acpi_driver_data(device); |
175 | ||
176 | if (!device || !cdev) | |
d550d98d | 177 | return -EINVAL; |
1da177e4 | 178 | |
05a83d97 ZR |
179 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); |
180 | sysfs_remove_link(&cdev->device.kobj, "device"); | |
181 | thermal_cooling_device_unregister(cdev); | |
1da177e4 | 182 | |
d550d98d | 183 | return 0; |
1da177e4 LT |
184 | } |
185 | ||
ec68373c LB |
186 | static 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 | ||
196 | static int acpi_fan_resume(struct acpi_device *device) | |
197 | { | |
488a76c5 | 198 | int result; |
ec68373c LB |
199 | |
200 | if (!device) | |
201 | return -EINVAL; | |
202 | ||
488a76c5 RW |
203 | result = acpi_bus_update_power(device->handle, NULL); |
204 | if (result) | |
205 | printk(KERN_ERR PREFIX "Error updating fan power state\n"); | |
ec68373c LB |
206 | |
207 | return result; | |
208 | } | |
209 | ||
4be44fcd | 210 | static int __init acpi_fan_init(void) |
1da177e4 | 211 | { |
c65ade4d | 212 | int result = 0; |
1da177e4 | 213 | |
1da177e4 | 214 | result = acpi_bus_register_driver(&acpi_fan_driver); |
b2a44989 | 215 | if (result < 0) |
d550d98d | 216 | return -ENODEV; |
1da177e4 | 217 | |
d550d98d | 218 | return 0; |
1da177e4 LT |
219 | } |
220 | ||
4be44fcd | 221 | static void __exit acpi_fan_exit(void) |
1da177e4 | 222 | { |
1da177e4 LT |
223 | |
224 | acpi_bus_unregister_driver(&acpi_fan_driver); | |
225 | ||
d550d98d | 226 | return; |
1da177e4 LT |
227 | } |
228 | ||
1da177e4 LT |
229 | module_init(acpi_fan_init); |
230 | module_exit(acpi_fan_exit); |