1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
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 <linux/proc_fs.h>
31#include <linux/seq_file.h>
32#include <asm/uaccess.h>
33#include <linux/thermal.h>
34#include <acpi/acpi_bus.h>
35#include <acpi/acpi_drivers.h>
36
37#define PREFIX "ACPI: "
38
39#define ACPI_FAN_CLASS "fan"
40#define ACPI_FAN_FILE_STATE "state"
41
42#define _COMPONENT ACPI_FAN_COMPONENT
43ACPI_MODULE_NAME("fan");
44
45MODULE_AUTHOR("Paul Diefenbaugh");
46MODULE_DESCRIPTION("ACPI Fan Driver");
47MODULE_LICENSE("GPL");
48
49static int acpi_fan_add(struct acpi_device *device);
50static int acpi_fan_remove(struct acpi_device *device, int type);
51static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
52static int acpi_fan_resume(struct acpi_device *device);
53
54static const struct acpi_device_id fan_device_ids[] = {
55 {"PNP0C0B", 0},
56 {"", 0},
57};
58MODULE_DEVICE_TABLE(acpi, fan_device_ids);
59
60static struct acpi_driver acpi_fan_driver = {
61 .name = "fan",
62 .class = ACPI_FAN_CLASS,
63 .ids = fan_device_ids,
64 .ops = {
65 .add = acpi_fan_add,
66 .remove = acpi_fan_remove,
67 .suspend = acpi_fan_suspend,
68 .resume = acpi_fan_resume,
69 },
70};
71
72
73static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
74 *state)
75{
76
77 *state = 1;
78 return 0;
79}
80
81static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
82 *state)
83{
84 struct acpi_device *device = cdev->devdata;
85 int result;
86 int acpi_state;
87
88 if (!device)
89 return -EINVAL;
90
91 result = acpi_bus_get_power(device->handle, &acpi_state);
92 if (result)
93 return result;
94
95 *state = (acpi_state == ACPI_STATE_D3 ? 0 :
96 (acpi_state == ACPI_STATE_D0 ? 1 : -1));
97 return 0;
98}
99
100static int
101fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
102{
103 struct acpi_device *device = cdev->devdata;
104 int result;
105
106 if (!device || (state != 0 && state != 1))
107 return -EINVAL;
108
109 result = acpi_bus_set_power(device->handle,
110 state ? ACPI_STATE_D0 : ACPI_STATE_D3);
111
112 return result;
113}
114
115static struct thermal_cooling_device_ops fan_cooling_ops = {
116 .get_max_state = fan_get_max_state,
117 .get_cur_state = fan_get_cur_state,
118 .set_cur_state = fan_set_cur_state,
119};
120
121
122
123
124#ifdef CONFIG_ACPI_PROCFS
125
126static struct proc_dir_entry *acpi_fan_dir;
127
128static int acpi_fan_read_state(struct seq_file *seq, void *offset)
129{
130 struct acpi_device *device = seq->private;
131 int state = 0;
132
133
134 if (device) {
135 if (acpi_bus_get_power(device->handle, &state))
136 seq_printf(seq, "status: ERROR\n");
137 else
138 seq_printf(seq, "status: %s\n",
139 !state ? "on" : "off");
140 }
141 return 0;
142}
143
144static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
145{
146 return single_open(file, acpi_fan_read_state, PDE(inode)->data);
147}
148
149static ssize_t
150acpi_fan_write_state(struct file *file, const char __user * buffer,
151 size_t count, loff_t * ppos)
152{
153 int result = 0;
154 struct seq_file *m = file->private_data;
155 struct acpi_device *device = m->private;
156 char state_string[3] = { '\0' };
157
158 if (count > sizeof(state_string) - 1)
159 return -EINVAL;
160
161 if (copy_from_user(state_string, buffer, count))
162 return -EFAULT;
163
164 state_string[count] = '\0';
165 if ((state_string[0] < '0') || (state_string[0] > '3'))
166 return -EINVAL;
167 if (state_string[1] == '\n')
168 state_string[1] = '\0';
169 if (state_string[1] != '\0')
170 return -EINVAL;
171
172 result = acpi_bus_set_power(device->handle,
173 simple_strtoul(state_string, NULL, 0));
174 if (result)
175 return result;
176
177 return count;
178}
179
180static const struct file_operations acpi_fan_state_ops = {
181 .open = acpi_fan_state_open_fs,
182 .read = seq_read,
183 .write = acpi_fan_write_state,
184 .llseek = seq_lseek,
185 .release = single_release,
186 .owner = THIS_MODULE,
187};
188
189static int acpi_fan_add_fs(struct acpi_device *device)
190{
191 struct proc_dir_entry *entry = NULL;
192
193
194 if (!device)
195 return -EINVAL;
196
197 if (!acpi_device_dir(device)) {
198 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
199 acpi_fan_dir);
200 if (!acpi_device_dir(device))
201 return -ENODEV;
202 }
203
204
205 entry = proc_create_data(ACPI_FAN_FILE_STATE,
206 S_IFREG | S_IRUGO | S_IWUSR,
207 acpi_device_dir(device),
208 &acpi_fan_state_ops,
209 device);
210 if (!entry)
211 return -ENODEV;
212 return 0;
213}
214
215static int acpi_fan_remove_fs(struct acpi_device *device)
216{
217
218 if (acpi_device_dir(device)) {
219 remove_proc_entry(ACPI_FAN_FILE_STATE, acpi_device_dir(device));
220 remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
221 acpi_device_dir(device) = NULL;
222 }
223
224 return 0;
225}
226#else
227static int acpi_fan_add_fs(struct acpi_device *device)
228{
229 return 0;
230}
231
232static int acpi_fan_remove_fs(struct acpi_device *device)
233{
234 return 0;
235}
236#endif
237
238
239
240
241static int acpi_fan_add(struct acpi_device *device)
242{
243 int result = 0;
244 int state = 0;
245 struct thermal_cooling_device *cdev;
246
247 if (!device)
248 return -EINVAL;
249
250 strcpy(acpi_device_name(device), "Fan");
251 strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
252
253 result = acpi_bus_get_power(device->handle, &state);
254 if (result) {
255 printk(KERN_ERR PREFIX "Reading power state\n");
256 goto end;
257 }
258
259 device->flags.force_power_state = 1;
260 acpi_bus_set_power(device->handle, state);
261 device->flags.force_power_state = 0;
262
263 cdev = thermal_cooling_device_register("Fan", device,
264 &fan_cooling_ops);
265 if (IS_ERR(cdev)) {
266 result = PTR_ERR(cdev);
267 goto end;
268 }
269
270 dev_info(&device->dev, "registered as cooling_device%d\n", cdev->id);
271
272 device->driver_data = cdev;
273 result = sysfs_create_link(&device->dev.kobj,
274 &cdev->device.kobj,
275 "thermal_cooling");
276 if (result)
277 dev_err(&device->dev, "Failed to create sysfs link "
278 "'thermal_cooling'\n");
279
280 result = sysfs_create_link(&cdev->device.kobj,
281 &device->dev.kobj,
282 "device");
283 if (result)
284 dev_err(&device->dev, "Failed to create sysfs link "
285 "'device'\n");
286
287 result = acpi_fan_add_fs(device);
288 if (result)
289 goto end;
290
291 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
292 acpi_device_name(device), acpi_device_bid(device),
293 !device->power.state ? "on" : "off");
294
295 end:
296 return result;
297}
298
299static int acpi_fan_remove(struct acpi_device *device, int type)
300{
301 struct thermal_cooling_device *cdev = acpi_driver_data(device);
302
303 if (!device || !cdev)
304 return -EINVAL;
305
306 acpi_fan_remove_fs(device);
307 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
308 sysfs_remove_link(&cdev->device.kobj, "device");
309 thermal_cooling_device_unregister(cdev);
310
311 return 0;
312}
313
314static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state)
315{
316 if (!device)
317 return -EINVAL;
318
319 acpi_bus_set_power(device->handle, ACPI_STATE_D0);
320
321 return AE_OK;
322}
323
324static int acpi_fan_resume(struct acpi_device *device)
325{
326 int result = 0;
327 int power_state = 0;
328
329 if (!device)
330 return -EINVAL;
331
332 result = acpi_bus_get_power(device->handle, &power_state);
333 if (result) {
334 printk(KERN_ERR PREFIX
335 "Error reading fan power state\n");
336 return result;
337 }
338
339 device->flags.force_power_state = 1;
340 acpi_bus_set_power(device->handle, power_state);
341 device->flags.force_power_state = 0;
342
343 return result;
344}
345
346static int __init acpi_fan_init(void)
347{
348 int result = 0;
349
350
351#ifdef CONFIG_ACPI_PROCFS
352 acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
353 if (!acpi_fan_dir)
354 return -ENODEV;
355#endif
356
357 result = acpi_bus_register_driver(&acpi_fan_driver);
358 if (result < 0) {
359 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
360 return -ENODEV;
361 }
362
363 return 0;
364}
365
366static void __exit acpi_fan_exit(void)
367{
368
369 acpi_bus_unregister_driver(&acpi_fan_driver);
370
371 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
372
373 return;
374}
375
376module_init(acpi_fan_init);
377module_exit(acpi_fan_exit);
378
