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