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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> | |
88989fd2 | 30 | #include <linux/uaccess.h> |
05a83d97 | 31 | #include <linux/thermal.h> |
8b48463f | 32 | #include <linux/acpi.h> |
1da177e4 | 33 | |
1da177e4 | 34 | #define ACPI_FAN_CLASS "fan" |
1da177e4 | 35 | #define ACPI_FAN_FILE_STATE "state" |
1da177e4 LT |
36 | |
37 | #define _COMPONENT ACPI_FAN_COMPONENT | |
f52fd66d | 38 | ACPI_MODULE_NAME("fan"); |
1da177e4 | 39 | |
f52fd66d | 40 | MODULE_AUTHOR("Paul Diefenbaugh"); |
7cda93e0 | 41 | MODULE_DESCRIPTION("ACPI Fan Driver"); |
1da177e4 LT |
42 | MODULE_LICENSE("GPL"); |
43 | ||
4be44fcd | 44 | static int acpi_fan_add(struct acpi_device *device); |
51fac838 | 45 | static int acpi_fan_remove(struct acpi_device *device); |
1da177e4 | 46 | |
1ba90e3a TR |
47 | static const struct acpi_device_id fan_device_ids[] = { |
48 | {"PNP0C0B", 0}, | |
49 | {"", 0}, | |
50 | }; | |
51 | MODULE_DEVICE_TABLE(acpi, fan_device_ids); | |
52 | ||
90692404 | 53 | #ifdef CONFIG_PM_SLEEP |
62fcbdd9 RW |
54 | static int acpi_fan_suspend(struct device *dev); |
55 | static int acpi_fan_resume(struct device *dev); | |
b9b8515f AL |
56 | static struct dev_pm_ops acpi_fan_pm = { |
57 | .resume = acpi_fan_resume, | |
58 | .freeze = acpi_fan_suspend, | |
59 | .thaw = acpi_fan_resume, | |
60 | .restore = acpi_fan_resume, | |
61 | }; | |
62 | #define FAN_PM_OPS_PTR (&acpi_fan_pm) | |
b108e0ea | 63 | #else |
b9b8515f | 64 | #define FAN_PM_OPS_PTR NULL |
90692404 | 65 | #endif |
62fcbdd9 | 66 | |
1da177e4 | 67 | static struct acpi_driver acpi_fan_driver = { |
c2b6705b | 68 | .name = "fan", |
4be44fcd | 69 | .class = ACPI_FAN_CLASS, |
1ba90e3a | 70 | .ids = fan_device_ids, |
4be44fcd LB |
71 | .ops = { |
72 | .add = acpi_fan_add, | |
73 | .remove = acpi_fan_remove, | |
74 | }, | |
b9b8515f | 75 | .drv.pm = FAN_PM_OPS_PTR, |
1da177e4 LT |
76 | }; |
77 | ||
05a83d97 | 78 | /* thermal cooling device callbacks */ |
6503e5df MG |
79 | static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long |
80 | *state) | |
05a83d97 ZR |
81 | { |
82 | /* ACPI fan device only support two states: ON/OFF */ | |
6503e5df MG |
83 | *state = 1; |
84 | return 0; | |
05a83d97 ZR |
85 | } |
86 | ||
6503e5df MG |
87 | static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long |
88 | *state) | |
05a83d97 ZR |
89 | { |
90 | struct acpi_device *device = cdev->devdata; | |
05a83d97 | 91 | int result; |
85eb9827 | 92 | int acpi_state = ACPI_STATE_D0; |
05a83d97 ZR |
93 | |
94 | if (!device) | |
95 | return -EINVAL; | |
96 | ||
488a76c5 | 97 | result = acpi_bus_update_power(device->handle, &acpi_state); |
05a83d97 ZR |
98 | if (result) |
99 | return result; | |
100 | ||
8ad928d5 | 101 | *state = (acpi_state == ACPI_STATE_D3_COLD ? 0 : |
6503e5df MG |
102 | (acpi_state == ACPI_STATE_D0 ? 1 : -1)); |
103 | return 0; | |
05a83d97 ZR |
104 | } |
105 | ||
106 | static int | |
6503e5df | 107 | fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) |
05a83d97 ZR |
108 | { |
109 | struct acpi_device *device = cdev->devdata; | |
110 | int result; | |
111 | ||
112 | if (!device || (state != 0 && state != 1)) | |
113 | return -EINVAL; | |
114 | ||
115 | result = acpi_bus_set_power(device->handle, | |
8ad928d5 | 116 | state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD); |
05a83d97 ZR |
117 | |
118 | return result; | |
119 | } | |
120 | ||
9c8b04be | 121 | static const struct thermal_cooling_device_ops fan_cooling_ops = { |
05a83d97 ZR |
122 | .get_max_state = fan_get_max_state, |
123 | .get_cur_state = fan_get_cur_state, | |
124 | .set_cur_state = fan_set_cur_state, | |
125 | }; | |
126 | ||
1da177e4 | 127 | /* -------------------------------------------------------------------------- |
88989fd2 SM |
128 | * Driver Interface |
129 | * -------------------------------------------------------------------------- | |
130 | */ | |
1da177e4 | 131 | |
4be44fcd | 132 | static int acpi_fan_add(struct acpi_device *device) |
1da177e4 | 133 | { |
4be44fcd | 134 | int result = 0; |
05a83d97 | 135 | struct thermal_cooling_device *cdev; |
1da177e4 LT |
136 | |
137 | if (!device) | |
d550d98d | 138 | return -EINVAL; |
1da177e4 | 139 | |
c65ade4d | 140 | strcpy(acpi_device_name(device), "Fan"); |
1da177e4 | 141 | strcpy(acpi_device_class(device), ACPI_FAN_CLASS); |
1da177e4 | 142 | |
488a76c5 | 143 | result = acpi_bus_update_power(device->handle, NULL); |
1da177e4 | 144 | if (result) { |
88989fd2 | 145 | dev_err(&device->dev, "Setting initial power state\n"); |
1da177e4 LT |
146 | goto end; |
147 | } | |
148 | ||
05a83d97 ZR |
149 | cdev = thermal_cooling_device_register("Fan", device, |
150 | &fan_cooling_ops); | |
19b36780 TS |
151 | if (IS_ERR(cdev)) { |
152 | result = PTR_ERR(cdev); | |
153 | goto end; | |
154 | } | |
9030062f | 155 | |
13c41157 | 156 | dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id); |
9030062f | 157 | |
db89b4f0 | 158 | device->driver_data = cdev; |
9030062f JL |
159 | result = sysfs_create_link(&device->dev.kobj, |
160 | &cdev->device.kobj, | |
161 | "thermal_cooling"); | |
162 | if (result) | |
fc3a8828 GKH |
163 | dev_err(&device->dev, "Failed to create sysfs link " |
164 | "'thermal_cooling'\n"); | |
9030062f JL |
165 | |
166 | result = sysfs_create_link(&cdev->device.kobj, | |
167 | &device->dev.kobj, | |
168 | "device"); | |
169 | if (result) | |
88989fd2 | 170 | dev_err(&device->dev, "Failed to create sysfs link 'device'\n"); |
05a83d97 | 171 | |
88989fd2 | 172 | dev_info(&device->dev, "ACPI: %s [%s] (%s)\n", |
4be44fcd LB |
173 | acpi_device_name(device), acpi_device_bid(device), |
174 | !device->power.state ? "on" : "off"); | |
1da177e4 | 175 | |
568b6ad8 | 176 | end: |
d550d98d | 177 | return result; |
1da177e4 LT |
178 | } |
179 | ||
51fac838 | 180 | static int acpi_fan_remove(struct acpi_device *device) |
1da177e4 | 181 | { |
f0c29583 CIK |
182 | struct thermal_cooling_device *cdev; |
183 | ||
184 | if (!device) | |
185 | return -EINVAL; | |
05a83d97 | 186 | |
f0c29583 CIK |
187 | cdev = acpi_driver_data(device); |
188 | if (!cdev) | |
d550d98d | 189 | return -EINVAL; |
1da177e4 | 190 | |
05a83d97 ZR |
191 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); |
192 | sysfs_remove_link(&cdev->device.kobj, "device"); | |
193 | thermal_cooling_device_unregister(cdev); | |
1da177e4 | 194 | |
d550d98d | 195 | return 0; |
1da177e4 LT |
196 | } |
197 | ||
90692404 | 198 | #ifdef CONFIG_PM_SLEEP |
62fcbdd9 | 199 | static int acpi_fan_suspend(struct device *dev) |
ec68373c | 200 | { |
62fcbdd9 | 201 | if (!dev) |
ec68373c LB |
202 | return -EINVAL; |
203 | ||
62fcbdd9 | 204 | acpi_bus_set_power(to_acpi_device(dev)->handle, ACPI_STATE_D0); |
ec68373c LB |
205 | |
206 | return AE_OK; | |
207 | } | |
208 | ||
62fcbdd9 | 209 | static int acpi_fan_resume(struct device *dev) |
ec68373c | 210 | { |
488a76c5 | 211 | int result; |
ec68373c | 212 | |
62fcbdd9 | 213 | if (!dev) |
ec68373c LB |
214 | return -EINVAL; |
215 | ||
62fcbdd9 | 216 | result = acpi_bus_update_power(to_acpi_device(dev)->handle, NULL); |
488a76c5 | 217 | if (result) |
88989fd2 | 218 | dev_err(dev, "Error updating fan power state\n"); |
ec68373c LB |
219 | |
220 | return result; | |
221 | } | |
90692404 | 222 | #endif |
ec68373c | 223 | |
d8014c4b | 224 | module_acpi_driver(acpi_fan_driver); |