Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / fan.c
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 <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
43 ACPI_MODULE_NAME("fan");
44
45 MODULE_AUTHOR("Paul Diefenbaugh");
46 MODULE_DESCRIPTION("ACPI Fan Driver");
47 MODULE_LICENSE("GPL");
48
49 static int acpi_fan_add(struct acpi_device *device);
50 static int acpi_fan_remove(struct acpi_device *device, int type);
51 static int acpi_fan_suspend(struct acpi_device *device, pm_message_t state);
52 static int acpi_fan_resume(struct acpi_device *device);
53
54 static const struct acpi_device_id fan_device_ids[] = {
55 {"PNP0C0B", 0},
56 {"", 0},
57 };
58 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
59
60 static 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 /* thermal cooling device callbacks */
73 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
74 *state)
75 {
76 /* ACPI fan device only support two states: ON/OFF */
77 *state = 1;
78 return 0;
79 }
80
81 static 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
100 static int
101 fan_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
115 static 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 FS Interface (/proc)
123 -------------------------------------------------------------------------- */
124 #ifdef CONFIG_ACPI_PROCFS
125
126 static struct proc_dir_entry *acpi_fan_dir;
127
128 static 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
144 static 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
149 static ssize_t
150 acpi_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
180 static 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
189 static 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 /* 'status' [R/W] */
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
215 static 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
227 static int acpi_fan_add_fs(struct acpi_device *device)
228 {
229 return 0;
230 }
231
232 static int acpi_fan_remove_fs(struct acpi_device *device)
233 {
234 return 0;
235 }
236 #endif
237 /* --------------------------------------------------------------------------
238 Driver Interface
239 -------------------------------------------------------------------------- */
240
241 static 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_dbg(&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
299 static 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
314 static 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
324 static 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
346 static int __init acpi_fan_init(void)
347 {
348 int result = 0;
349
350 #ifdef CONFIG_ACPI_PROCFS
351 acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
352 if (!acpi_fan_dir)
353 return -ENODEV;
354 #endif
355
356 result = acpi_bus_register_driver(&acpi_fan_driver);
357 if (result < 0) {
358 #ifdef CONFIG_ACPI_PROCFS
359 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
360 #endif
361 return -ENODEV;
362 }
363
364 return 0;
365 }
366
367 static void __exit acpi_fan_exit(void)
368 {
369
370 acpi_bus_unregister_driver(&acpi_fan_driver);
371
372 remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
373
374 return;
375 }
376
377 module_init(acpi_fan_init);
378 module_exit(acpi_fan_exit);