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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); | |
1da177e4 | 49 | |
1ba90e3a TR |
50 | static const struct acpi_device_id fan_device_ids[] = { |
51 | {"PNP0C0B", 0}, | |
52 | {"", 0}, | |
53 | }; | |
54 | MODULE_DEVICE_TABLE(acpi, fan_device_ids); | |
55 | ||
62fcbdd9 RW |
56 | static int acpi_fan_suspend(struct device *dev); |
57 | static int acpi_fan_resume(struct device *dev); | |
58 | static SIMPLE_DEV_PM_OPS(acpi_fan_pm, acpi_fan_suspend, acpi_fan_resume); | |
59 | ||
1da177e4 | 60 | static struct acpi_driver acpi_fan_driver = { |
c2b6705b | 61 | .name = "fan", |
4be44fcd | 62 | .class = ACPI_FAN_CLASS, |
1ba90e3a | 63 | .ids = fan_device_ids, |
4be44fcd LB |
64 | .ops = { |
65 | .add = acpi_fan_add, | |
66 | .remove = acpi_fan_remove, | |
67 | }, | |
62fcbdd9 | 68 | .drv.pm = &acpi_fan_pm, |
1da177e4 LT |
69 | }; |
70 | ||
05a83d97 | 71 | /* thermal cooling device callbacks */ |
6503e5df MG |
72 | static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long |
73 | *state) | |
05a83d97 ZR |
74 | { |
75 | /* ACPI fan device only support two states: ON/OFF */ | |
6503e5df MG |
76 | *state = 1; |
77 | return 0; | |
05a83d97 ZR |
78 | } |
79 | ||
6503e5df MG |
80 | static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long |
81 | *state) | |
05a83d97 ZR |
82 | { |
83 | struct acpi_device *device = cdev->devdata; | |
05a83d97 | 84 | int result; |
6503e5df | 85 | int acpi_state; |
05a83d97 ZR |
86 | |
87 | if (!device) | |
88 | return -EINVAL; | |
89 | ||
488a76c5 | 90 | result = acpi_bus_update_power(device->handle, &acpi_state); |
05a83d97 ZR |
91 | if (result) |
92 | return result; | |
93 | ||
6503e5df MG |
94 | *state = (acpi_state == ACPI_STATE_D3 ? 0 : |
95 | (acpi_state == ACPI_STATE_D0 ? 1 : -1)); | |
96 | return 0; | |
05a83d97 ZR |
97 | } |
98 | ||
99 | static int | |
6503e5df | 100 | fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) |
05a83d97 ZR |
101 | { |
102 | struct acpi_device *device = cdev->devdata; | |
103 | int result; | |
104 | ||
105 | if (!device || (state != 0 && state != 1)) | |
106 | return -EINVAL; | |
107 | ||
108 | result = acpi_bus_set_power(device->handle, | |
109 | state ? ACPI_STATE_D0 : ACPI_STATE_D3); | |
110 | ||
111 | return result; | |
112 | } | |
113 | ||
9c8b04be | 114 | static const struct thermal_cooling_device_ops fan_cooling_ops = { |
05a83d97 ZR |
115 | .get_max_state = fan_get_max_state, |
116 | .get_cur_state = fan_get_cur_state, | |
117 | .set_cur_state = fan_set_cur_state, | |
118 | }; | |
119 | ||
1da177e4 LT |
120 | /* -------------------------------------------------------------------------- |
121 | Driver Interface | |
122 | -------------------------------------------------------------------------- */ | |
123 | ||
4be44fcd | 124 | static int acpi_fan_add(struct acpi_device *device) |
1da177e4 | 125 | { |
4be44fcd | 126 | int result = 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 | |
488a76c5 | 135 | result = acpi_bus_update_power(device->handle, NULL); |
1da177e4 | 136 | if (result) { |
488a76c5 | 137 | printk(KERN_ERR PREFIX "Setting initial power state\n"); |
1da177e4 LT |
138 | goto end; |
139 | } | |
140 | ||
05a83d97 ZR |
141 | cdev = thermal_cooling_device_register("Fan", device, |
142 | &fan_cooling_ops); | |
19b36780 TS |
143 | if (IS_ERR(cdev)) { |
144 | result = PTR_ERR(cdev); | |
145 | goto end; | |
146 | } | |
9030062f | 147 | |
13c41157 | 148 | dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id); |
9030062f | 149 | |
db89b4f0 | 150 | device->driver_data = cdev; |
9030062f JL |
151 | result = sysfs_create_link(&device->dev.kobj, |
152 | &cdev->device.kobj, | |
153 | "thermal_cooling"); | |
154 | if (result) | |
fc3a8828 GKH |
155 | dev_err(&device->dev, "Failed to create sysfs link " |
156 | "'thermal_cooling'\n"); | |
9030062f JL |
157 | |
158 | result = sysfs_create_link(&cdev->device.kobj, | |
159 | &device->dev.kobj, | |
160 | "device"); | |
161 | if (result) | |
fc3a8828 GKH |
162 | dev_err(&device->dev, "Failed to create sysfs link " |
163 | "'device'\n"); | |
05a83d97 | 164 | |
1da177e4 | 165 | printk(KERN_INFO PREFIX "%s [%s] (%s)\n", |
4be44fcd LB |
166 | acpi_device_name(device), acpi_device_bid(device), |
167 | !device->power.state ? "on" : "off"); | |
1da177e4 | 168 | |
4be44fcd | 169 | end: |
d550d98d | 170 | return result; |
1da177e4 LT |
171 | } |
172 | ||
4be44fcd | 173 | static int acpi_fan_remove(struct acpi_device *device, int type) |
1da177e4 | 174 | { |
05a83d97 ZR |
175 | struct thermal_cooling_device *cdev = acpi_driver_data(device); |
176 | ||
177 | if (!device || !cdev) | |
d550d98d | 178 | return -EINVAL; |
1da177e4 | 179 | |
05a83d97 ZR |
180 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); |
181 | sysfs_remove_link(&cdev->device.kobj, "device"); | |
182 | thermal_cooling_device_unregister(cdev); | |
1da177e4 | 183 | |
d550d98d | 184 | return 0; |
1da177e4 LT |
185 | } |
186 | ||
62fcbdd9 | 187 | static int acpi_fan_suspend(struct device *dev) |
ec68373c | 188 | { |
62fcbdd9 | 189 | if (!dev) |
ec68373c LB |
190 | return -EINVAL; |
191 | ||
62fcbdd9 | 192 | acpi_bus_set_power(to_acpi_device(dev)->handle, ACPI_STATE_D0); |
ec68373c LB |
193 | |
194 | return AE_OK; | |
195 | } | |
196 | ||
62fcbdd9 | 197 | static int acpi_fan_resume(struct device *dev) |
ec68373c | 198 | { |
488a76c5 | 199 | int result; |
ec68373c | 200 | |
62fcbdd9 | 201 | if (!dev) |
ec68373c LB |
202 | return -EINVAL; |
203 | ||
62fcbdd9 | 204 | result = acpi_bus_update_power(to_acpi_device(dev)->handle, NULL); |
488a76c5 RW |
205 | if (result) |
206 | printk(KERN_ERR PREFIX "Error updating fan power state\n"); | |
ec68373c LB |
207 | |
208 | return result; | |
209 | } | |
210 | ||
4be44fcd | 211 | static int __init acpi_fan_init(void) |
1da177e4 | 212 | { |
c65ade4d | 213 | int result = 0; |
1da177e4 | 214 | |
1da177e4 | 215 | result = acpi_bus_register_driver(&acpi_fan_driver); |
b2a44989 | 216 | if (result < 0) |
d550d98d | 217 | return -ENODEV; |
1da177e4 | 218 | |
d550d98d | 219 | return 0; |
1da177e4 LT |
220 | } |
221 | ||
4be44fcd | 222 | static void __exit acpi_fan_exit(void) |
1da177e4 | 223 | { |
1da177e4 LT |
224 | |
225 | acpi_bus_unregister_driver(&acpi_fan_driver); | |
226 | ||
d550d98d | 227 | return; |
1da177e4 LT |
228 | } |
229 | ||
1da177e4 LT |
230 | module_init(acpi_fan_init); |
231 | module_exit(acpi_fan_exit); |