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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
41ACPI_MODULE_NAME("fan");
42
43MODULE_AUTHOR("Paul Diefenbaugh");
44MODULE_DESCRIPTION("ACPI Fan Driver");
45MODULE_LICENSE("GPL");
46
47static int acpi_fan_add(struct acpi_device *device);
48static int acpi_fan_remove(struct acpi_device *device, int type);
49static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
50static int acpi_fan_resume(struct acpi_device *device);
51
52static const struct acpi_device_id fan_device_ids[] = {
53 {"PNP0C0B", 0},
54 {"", 0},
55};
56MODULE_DEVICE_TABLE(acpi, fan_device_ids);
57
58static struct acpi_driver acpi_fan_driver = {
59 .name = "fan",
60 .class = ACPI_FAN_CLASS,
61 .ids = fan_device_ids,
62 .ops = {
63 .add = acpi_fan_add,
64 .remove = acpi_fan_remove,
65 .suspend = acpi_fan_suspend,
66 .resume = acpi_fan_resume,
67 },
68};
69
70
71static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
72 *state)
73{
74
75 *state = 1;
76 return 0;
77}
78
79static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
80 *state)
81{
82 struct acpi_device *device = cdev->devdata;
83 int result;
84 int acpi_state;
85
86 if (!device)
87 return -EINVAL;
88
89 result = acpi_bus_update_power(device->handle, &acpi_state);
90 if (result)
91 return result;
92
93 *state = (acpi_state == ACPI_STATE_D3 ? 0 :
94 (acpi_state == ACPI_STATE_D0 ? 1 : -1));
95 return 0;
96}
97
98static int
99fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
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
113static 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
119
120
121
122
123static int acpi_fan_add(struct acpi_device *device)
124{
125 int result = 0;
126 struct thermal_cooling_device *cdev;
127
128 if (!device)
129 return -EINVAL;
130
131 strcpy(acpi_device_name(device), "Fan");
132 strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
133
134 result = acpi_bus_update_power(device->handle, NULL);
135 if (result) {
136 printk(KERN_ERR PREFIX "Setting initial power state\n");
137 goto end;
138 }
139
140 cdev = thermal_cooling_device_register("Fan", device,
141 &fan_cooling_ops);
142 if (IS_ERR(cdev)) {
143 result = PTR_ERR(cdev);
144 goto end;
145 }
146
147 dev_dbg(&device->dev, "registered as cooling_device%d\n", cdev->id);
148
149 device->driver_data = cdev;
150 result = sysfs_create_link(&device->dev.kobj,
151 &cdev->device.kobj,
152 "thermal_cooling");
153 if (result)
154 dev_err(&device->dev, "Failed to create sysfs link "
155 "'thermal_cooling'\n");
156
157 result = sysfs_create_link(&cdev->device.kobj,
158 &device->dev.kobj,
159 "device");
160 if (result)
161 dev_err(&device->dev, "Failed to create sysfs link "
162 "'device'\n");
163
164 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
165 acpi_device_name(device), acpi_device_bid(device),
166 !device->power.state ? "on" : "off");
167
168 end:
169 return result;
170}
171
172static int acpi_fan_remove(struct acpi_device *device, int type)
173{
174 struct thermal_cooling_device *cdev = acpi_driver_data(device);
175
176 if (!device || !cdev)
177 return -EINVAL;
178
179 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
180 sysfs_remove_link(&cdev->device.kobj, "device");
181 thermal_cooling_device_unregister(cdev);
182
183 return 0;
184}
185
186static 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
196static int acpi_fan_resume(struct acpi_device *device)
197{
198 int result;
199
200 if (!device)
201 return -EINVAL;
202
203 result = acpi_bus_update_power(device->handle, NULL);
204 if (result)
205 printk(KERN_ERR PREFIX "Error updating fan power state\n");
206
207 return result;
208}
209
210static int __init acpi_fan_init(void)
211{
212 int result = 0;
213
214 result = acpi_bus_register_driver(&acpi_fan_driver);
215 if (result < 0)
216 return -ENODEV;
217
218 return 0;
219}
220
221static void __exit acpi_fan_exit(void)
222{
223
224 acpi_bus_unregister_driver(&acpi_fan_driver);
225
226 return;
227}
228
229module_init(acpi_fan_init);
230module_exit(acpi_fan_exit);
231
