Pull fluff into release branch
[sfrench/cifs-2.6.git] / drivers / acpi / thermal.c
1 /*
2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
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  *  This driver fully implements the ACPI thermal policy as described in the
26  *  ACPI 2.0 Specification.
27  *
28  *  TBD: 1. Implement passive cooling hysteresis.
29  *       2. Enhance passive cooling (CPU) states/limit interface to support
30  *          concepts of 'multiple limiters', upper/lower limits, etc.
31  *
32  */
33
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/types.h>
38 #include <linux/proc_fs.h>
39 #include <linux/timer.h>
40 #include <linux/jiffies.h>
41 #include <linux/kmod.h>
42 #include <linux/seq_file.h>
43 #include <asm/uaccess.h>
44
45 #include <acpi/acpi_bus.h>
46 #include <acpi/acpi_drivers.h>
47
48 #define ACPI_THERMAL_COMPONENT          0x04000000
49 #define ACPI_THERMAL_CLASS              "thermal_zone"
50 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
51 #define ACPI_THERMAL_FILE_STATE         "state"
52 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
53 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
54 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
55 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
56 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
57 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
58 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
59 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
60 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
61 #define ACPI_THERMAL_MODE_ACTIVE        0x00
62 #define ACPI_THERMAL_MODE_PASSIVE       0x01
63 #define ACPI_THERMAL_MODE_CRITICAL      0xff
64 #define ACPI_THERMAL_PATH_POWEROFF      "/sbin/poweroff"
65
66 #define ACPI_THERMAL_MAX_ACTIVE 10
67 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
68
69 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
70 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
71
72 #define _COMPONENT              ACPI_THERMAL_COMPONENT
73 ACPI_MODULE_NAME("thermal");
74
75 MODULE_AUTHOR("Paul Diefenbaugh");
76 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
77 MODULE_LICENSE("GPL");
78
79 static int tzp;
80 module_param(tzp, int, 0);
81 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
82
83 static int acpi_thermal_add(struct acpi_device *device);
84 static int acpi_thermal_remove(struct acpi_device *device, int type);
85 static int acpi_thermal_resume(struct acpi_device *device);
86 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
87 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
88 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
89 static ssize_t acpi_thermal_write_trip_points(struct file *,
90                                               const char __user *, size_t,
91                                               loff_t *);
92 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
93 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
94                                                const char __user *, size_t,
95                                                loff_t *);
96 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
97 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
98                                           size_t, loff_t *);
99
100 static struct acpi_driver acpi_thermal_driver = {
101         .name = "thermal",
102         .class = ACPI_THERMAL_CLASS,
103         .ids = ACPI_THERMAL_HID,
104         .ops = {
105                 .add = acpi_thermal_add,
106                 .remove = acpi_thermal_remove,
107                 .resume = acpi_thermal_resume,
108                 },
109 };
110
111 struct acpi_thermal_state {
112         u8 critical:1;
113         u8 hot:1;
114         u8 passive:1;
115         u8 active:1;
116         u8 reserved:4;
117         int active_index;
118 };
119
120 struct acpi_thermal_state_flags {
121         u8 valid:1;
122         u8 enabled:1;
123         u8 reserved:6;
124 };
125
126 struct acpi_thermal_critical {
127         struct acpi_thermal_state_flags flags;
128         unsigned long temperature;
129 };
130
131 struct acpi_thermal_hot {
132         struct acpi_thermal_state_flags flags;
133         unsigned long temperature;
134 };
135
136 struct acpi_thermal_passive {
137         struct acpi_thermal_state_flags flags;
138         unsigned long temperature;
139         unsigned long tc1;
140         unsigned long tc2;
141         unsigned long tsp;
142         struct acpi_handle_list devices;
143 };
144
145 struct acpi_thermal_active {
146         struct acpi_thermal_state_flags flags;
147         unsigned long temperature;
148         struct acpi_handle_list devices;
149 };
150
151 struct acpi_thermal_trips {
152         struct acpi_thermal_critical critical;
153         struct acpi_thermal_hot hot;
154         struct acpi_thermal_passive passive;
155         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
156 };
157
158 struct acpi_thermal_flags {
159         u8 cooling_mode:1;      /* _SCP */
160         u8 devices:1;           /* _TZD */
161         u8 reserved:6;
162 };
163
164 struct acpi_thermal {
165         struct acpi_device * device;
166         acpi_bus_id name;
167         unsigned long temperature;
168         unsigned long last_temperature;
169         unsigned long polling_frequency;
170         u8 cooling_mode;
171         volatile u8 zombie;
172         struct acpi_thermal_flags flags;
173         struct acpi_thermal_state state;
174         struct acpi_thermal_trips trips;
175         struct acpi_handle_list devices;
176         struct timer_list timer;
177 };
178
179 static const struct file_operations acpi_thermal_state_fops = {
180         .open = acpi_thermal_state_open_fs,
181         .read = seq_read,
182         .llseek = seq_lseek,
183         .release = single_release,
184 };
185
186 static const struct file_operations acpi_thermal_temp_fops = {
187         .open = acpi_thermal_temp_open_fs,
188         .read = seq_read,
189         .llseek = seq_lseek,
190         .release = single_release,
191 };
192
193 static const struct file_operations acpi_thermal_trip_fops = {
194         .open = acpi_thermal_trip_open_fs,
195         .read = seq_read,
196         .write = acpi_thermal_write_trip_points,
197         .llseek = seq_lseek,
198         .release = single_release,
199 };
200
201 static const struct file_operations acpi_thermal_cooling_fops = {
202         .open = acpi_thermal_cooling_open_fs,
203         .read = seq_read,
204         .write = acpi_thermal_write_cooling_mode,
205         .llseek = seq_lseek,
206         .release = single_release,
207 };
208
209 static const struct file_operations acpi_thermal_polling_fops = {
210         .open = acpi_thermal_polling_open_fs,
211         .read = seq_read,
212         .write = acpi_thermal_write_polling,
213         .llseek = seq_lseek,
214         .release = single_release,
215 };
216
217 /* --------------------------------------------------------------------------
218                              Thermal Zone Management
219    -------------------------------------------------------------------------- */
220
221 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
222 {
223         acpi_status status = AE_OK;
224
225
226         if (!tz)
227                 return -EINVAL;
228
229         tz->last_temperature = tz->temperature;
230
231         status =
232             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
233         if (ACPI_FAILURE(status))
234                 return -ENODEV;
235
236         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
237                           tz->temperature));
238
239         return 0;
240 }
241
242 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
243 {
244         acpi_status status = AE_OK;
245
246
247         if (!tz)
248                 return -EINVAL;
249
250         status =
251             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
252                                   &tz->polling_frequency);
253         if (ACPI_FAILURE(status))
254                 return -ENODEV;
255
256         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
257                           tz->polling_frequency));
258
259         return 0;
260 }
261
262 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
263 {
264
265         if (!tz)
266                 return -EINVAL;
267
268         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
269
270         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
271                           "Polling frequency set to %lu seconds\n",
272                           tz->polling_frequency/10));
273
274         return 0;
275 }
276
277 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
278 {
279         acpi_status status = AE_OK;
280         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
281         struct acpi_object_list arg_list = { 1, &arg0 };
282         acpi_handle handle = NULL;
283
284
285         if (!tz)
286                 return -EINVAL;
287
288         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
289         if (ACPI_FAILURE(status)) {
290                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
291                 return -ENODEV;
292         }
293
294         arg0.integer.value = mode;
295
296         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
297         if (ACPI_FAILURE(status))
298                 return -ENODEV;
299
300         tz->cooling_mode = mode;
301
302         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
303                           mode ? "passive" : "active"));
304
305         return 0;
306 }
307
308 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
309 {
310         acpi_status status = AE_OK;
311         int i = 0;
312
313
314         if (!tz)
315                 return -EINVAL;
316
317         /* Critical Shutdown (required) */
318
319         status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
320                                        &tz->trips.critical.temperature);
321         if (ACPI_FAILURE(status)) {
322                 tz->trips.critical.flags.valid = 0;
323                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
324                 return -ENODEV;
325         } else {
326                 tz->trips.critical.flags.valid = 1;
327                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
328                                   "Found critical threshold [%lu]\n",
329                                   tz->trips.critical.temperature));
330         }
331
332         /* Critical Sleep (optional) */
333
334         status =
335             acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
336                                   &tz->trips.hot.temperature);
337         if (ACPI_FAILURE(status)) {
338                 tz->trips.hot.flags.valid = 0;
339                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
340         } else {
341                 tz->trips.hot.flags.valid = 1;
342                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
343                                   tz->trips.hot.temperature));
344         }
345
346         /* Passive: Processors (optional) */
347
348         status =
349             acpi_evaluate_integer(tz->device->handle, "_PSV", NULL,
350                                   &tz->trips.passive.temperature);
351         if (ACPI_FAILURE(status)) {
352                 tz->trips.passive.flags.valid = 0;
353                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
354         } else {
355                 tz->trips.passive.flags.valid = 1;
356
357                 status =
358                     acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
359                                           &tz->trips.passive.tc1);
360                 if (ACPI_FAILURE(status))
361                         tz->trips.passive.flags.valid = 0;
362
363                 status =
364                     acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
365                                           &tz->trips.passive.tc2);
366                 if (ACPI_FAILURE(status))
367                         tz->trips.passive.flags.valid = 0;
368
369                 status =
370                     acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
371                                           &tz->trips.passive.tsp);
372                 if (ACPI_FAILURE(status))
373                         tz->trips.passive.flags.valid = 0;
374
375                 status =
376                     acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
377                                             &tz->trips.passive.devices);
378                 if (ACPI_FAILURE(status))
379                         tz->trips.passive.flags.valid = 0;
380
381                 if (!tz->trips.passive.flags.valid)
382                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
383                 else
384                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
385                                           "Found passive threshold [%lu]\n",
386                                           tz->trips.passive.temperature));
387         }
388
389         /* Active: Fans, etc. (optional) */
390
391         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
392
393                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
394
395                 status =
396                     acpi_evaluate_integer(tz->device->handle, name, NULL,
397                                           &tz->trips.active[i].temperature);
398                 if (ACPI_FAILURE(status))
399                         break;
400
401                 name[2] = 'L';
402                 status =
403                     acpi_evaluate_reference(tz->device->handle, name, NULL,
404                                             &tz->trips.active[i].devices);
405                 if (ACPI_SUCCESS(status)) {
406                         tz->trips.active[i].flags.valid = 1;
407                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
408                                           "Found active threshold [%d]:[%lu]\n",
409                                           i, tz->trips.active[i].temperature));
410                 } else
411                         ACPI_EXCEPTION((AE_INFO, status,
412                                         "Invalid active threshold [%d]", i));
413         }
414
415         return 0;
416 }
417
418 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
419 {
420         acpi_status status = AE_OK;
421
422
423         if (!tz)
424                 return -EINVAL;
425
426         status =
427             acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
428         if (ACPI_FAILURE(status))
429                 return -ENODEV;
430
431         return 0;
432 }
433
434 static int acpi_thermal_call_usermode(char *path)
435 {
436         char *argv[2] = { NULL, NULL };
437         char *envp[3] = { NULL, NULL, NULL };
438
439
440         if (!path)
441                 return -EINVAL;
442
443         argv[0] = path;
444
445         /* minimal command environment */
446         envp[0] = "HOME=/";
447         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
448
449         call_usermodehelper(argv[0], argv, envp, 0);
450
451         return 0;
452 }
453
454 static int acpi_thermal_critical(struct acpi_thermal *tz)
455 {
456         if (!tz || !tz->trips.critical.flags.valid)
457                 return -EINVAL;
458
459         if (tz->temperature >= tz->trips.critical.temperature) {
460                 printk(KERN_WARNING PREFIX "Critical trip point\n");
461                 tz->trips.critical.flags.enabled = 1;
462         } else if (tz->trips.critical.flags.enabled)
463                 tz->trips.critical.flags.enabled = 0;
464
465         printk(KERN_EMERG
466                "Critical temperature reached (%ld C), shutting down.\n",
467                KELVIN_TO_CELSIUS(tz->temperature));
468         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
469                                 tz->trips.critical.flags.enabled);
470
471         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
472
473         return 0;
474 }
475
476 static int acpi_thermal_hot(struct acpi_thermal *tz)
477 {
478         if (!tz || !tz->trips.hot.flags.valid)
479                 return -EINVAL;
480
481         if (tz->temperature >= tz->trips.hot.temperature) {
482                 printk(KERN_WARNING PREFIX "Hot trip point\n");
483                 tz->trips.hot.flags.enabled = 1;
484         } else if (tz->trips.hot.flags.enabled)
485                 tz->trips.hot.flags.enabled = 0;
486
487         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
488                                 tz->trips.hot.flags.enabled);
489
490         /* TBD: Call user-mode "sleep(S4)" function */
491
492         return 0;
493 }
494
495 static void acpi_thermal_passive(struct acpi_thermal *tz)
496 {
497         int result = 1;
498         struct acpi_thermal_passive *passive = NULL;
499         int trend = 0;
500         int i = 0;
501
502
503         if (!tz || !tz->trips.passive.flags.valid)
504                 return;
505
506         passive = &(tz->trips.passive);
507
508         /*
509          * Above Trip?
510          * -----------
511          * Calculate the thermal trend (using the passive cooling equation)
512          * and modify the performance limit for all passive cooling devices
513          * accordingly.  Note that we assume symmetry.
514          */
515         if (tz->temperature >= passive->temperature) {
516                 trend =
517                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
518                     (passive->tc2 * (tz->temperature - passive->temperature));
519                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
520                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
521                                   trend, passive->tc1, tz->temperature,
522                                   tz->last_temperature, passive->tc2,
523                                   tz->temperature, passive->temperature));
524                 passive->flags.enabled = 1;
525                 /* Heating up? */
526                 if (trend > 0)
527                         for (i = 0; i < passive->devices.count; i++)
528                                 acpi_processor_set_thermal_limit(passive->
529                                                                  devices.
530                                                                  handles[i],
531                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
532                 /* Cooling off? */
533                 else if (trend < 0) {
534                         for (i = 0; i < passive->devices.count; i++)
535                                 /*
536                                  * assume that we are on highest
537                                  * freq/lowest thrott and can leave
538                                  * passive mode, even in error case
539                                  */
540                                 if (!acpi_processor_set_thermal_limit
541                                     (passive->devices.handles[i],
542                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
543                                         result = 0;
544                         /*
545                          * Leave cooling mode, even if the temp might
546                          * higher than trip point This is because some
547                          * machines might have long thermal polling
548                          * frequencies (tsp) defined. We will fall back
549                          * into passive mode in next cycle (probably quicker)
550                          */
551                         if (result) {
552                                 passive->flags.enabled = 0;
553                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
554                                                   "Disabling passive cooling, still above threshold,"
555                                                   " but we are cooling down\n"));
556                         }
557                 }
558                 return;
559         }
560
561         /*
562          * Below Trip?
563          * -----------
564          * Implement passive cooling hysteresis to slowly increase performance
565          * and avoid thrashing around the passive trip point.  Note that we
566          * assume symmetry.
567          */
568         if (!passive->flags.enabled)
569                 return;
570         for (i = 0; i < passive->devices.count; i++)
571                 if (!acpi_processor_set_thermal_limit
572                     (passive->devices.handles[i],
573                      ACPI_PROCESSOR_LIMIT_DECREMENT))
574                         result = 0;
575         if (result) {
576                 passive->flags.enabled = 0;
577                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
578                                   "Disabling passive cooling (zone is cool)\n"));
579         }
580 }
581
582 static void acpi_thermal_active(struct acpi_thermal *tz)
583 {
584         int result = 0;
585         struct acpi_thermal_active *active = NULL;
586         int i = 0;
587         int j = 0;
588         unsigned long maxtemp = 0;
589
590
591         if (!tz)
592                 return;
593
594         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
595                 active = &(tz->trips.active[i]);
596                 if (!active || !active->flags.valid)
597                         break;
598                 if (tz->temperature >= active->temperature) {
599                         /*
600                          * Above Threshold?
601                          * ----------------
602                          * If not already enabled, turn ON all cooling devices
603                          * associated with this active threshold.
604                          */
605                         if (active->temperature > maxtemp)
606                                 tz->state.active_index = i;
607                         maxtemp = active->temperature;
608                         if (active->flags.enabled)
609                                 continue;
610                         for (j = 0; j < active->devices.count; j++) {
611                                 result =
612                                     acpi_bus_set_power(active->devices.
613                                                        handles[j],
614                                                        ACPI_STATE_D0);
615                                 if (result) {
616                                         printk(KERN_WARNING PREFIX
617                                                       "Unable to turn cooling device [%p] 'on'\n",
618                                                       active->devices.
619                                                       handles[j]);
620                                         continue;
621                                 }
622                                 active->flags.enabled = 1;
623                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
624                                                   "Cooling device [%p] now 'on'\n",
625                                                   active->devices.handles[j]));
626                         }
627                         continue;
628                 }
629                 if (!active->flags.enabled)
630                         continue;
631                 /*
632                  * Below Threshold?
633                  * ----------------
634                  * Turn OFF all cooling devices associated with this
635                  * threshold.
636                  */
637                 for (j = 0; j < active->devices.count; j++) {
638                         result = acpi_bus_set_power(active->devices.handles[j],
639                                                     ACPI_STATE_D3);
640                         if (result) {
641                                 printk(KERN_WARNING PREFIX
642                                               "Unable to turn cooling device [%p] 'off'\n",
643                                               active->devices.handles[j]);
644                                 continue;
645                         }
646                         active->flags.enabled = 0;
647                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
648                                           "Cooling device [%p] now 'off'\n",
649                                           active->devices.handles[j]));
650                 }
651         }
652 }
653
654 static void acpi_thermal_check(void *context);
655
656 static void acpi_thermal_run(unsigned long data)
657 {
658         struct acpi_thermal *tz = (struct acpi_thermal *)data;
659         if (!tz->zombie)
660                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
661 }
662
663 static void acpi_thermal_check(void *data)
664 {
665         int result = 0;
666         struct acpi_thermal *tz = data;
667         unsigned long sleep_time = 0;
668         int i = 0;
669         struct acpi_thermal_state state;
670
671
672         if (!tz) {
673                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
674                 return;
675         }
676
677         state = tz->state;
678
679         result = acpi_thermal_get_temperature(tz);
680         if (result)
681                 return;
682
683         memset(&tz->state, 0, sizeof(tz->state));
684
685         /*
686          * Check Trip Points
687          * -----------------
688          * Compare the current temperature to the trip point values to see
689          * if we've entered one of the thermal policy states.  Note that
690          * this function determines when a state is entered, but the 
691          * individual policy decides when it is exited (e.g. hysteresis).
692          */
693         if (tz->trips.critical.flags.valid)
694                 state.critical |=
695                     (tz->temperature >= tz->trips.critical.temperature);
696         if (tz->trips.hot.flags.valid)
697                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
698         if (tz->trips.passive.flags.valid)
699                 state.passive |=
700                     (tz->temperature >= tz->trips.passive.temperature);
701         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
702                 if (tz->trips.active[i].flags.valid)
703                         state.active |=
704                             (tz->temperature >=
705                              tz->trips.active[i].temperature);
706
707         /*
708          * Invoke Policy
709          * -------------
710          * Separated from the above check to allow individual policy to 
711          * determine when to exit a given state.
712          */
713         if (state.critical)
714                 acpi_thermal_critical(tz);
715         if (state.hot)
716                 acpi_thermal_hot(tz);
717         if (state.passive)
718                 acpi_thermal_passive(tz);
719         if (state.active)
720                 acpi_thermal_active(tz);
721
722         /*
723          * Calculate State
724          * ---------------
725          * Again, separated from the above two to allow independent policy
726          * decisions.
727          */
728         tz->state.critical = tz->trips.critical.flags.enabled;
729         tz->state.hot = tz->trips.hot.flags.enabled;
730         tz->state.passive = tz->trips.passive.flags.enabled;
731         tz->state.active = 0;
732         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
733                 tz->state.active |= tz->trips.active[i].flags.enabled;
734
735         /*
736          * Calculate Sleep Time
737          * --------------------
738          * If we're in the passive state, use _TSP's value.  Otherwise
739          * use the default polling frequency (e.g. _TZP).  If no polling
740          * frequency is specified then we'll wait forever (at least until
741          * a thermal event occurs).  Note that _TSP and _TZD values are
742          * given in 1/10th seconds (we must covert to milliseconds).
743          */
744         if (tz->state.passive)
745                 sleep_time = tz->trips.passive.tsp * 100;
746         else if (tz->polling_frequency > 0)
747                 sleep_time = tz->polling_frequency * 100;
748
749         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
750                           tz->name, tz->temperature, sleep_time));
751
752         /*
753          * Schedule Next Poll
754          * ------------------
755          */
756         if (!sleep_time) {
757                 if (timer_pending(&(tz->timer)))
758                         del_timer(&(tz->timer));
759         } else {
760                 if (timer_pending(&(tz->timer)))
761                         mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
762                 else {
763                         tz->timer.data = (unsigned long)tz;
764                         tz->timer.function = acpi_thermal_run;
765                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
766                         add_timer(&(tz->timer));
767                 }
768         }
769
770         return;
771 }
772
773 /* --------------------------------------------------------------------------
774                               FS Interface (/proc)
775    -------------------------------------------------------------------------- */
776
777 static struct proc_dir_entry *acpi_thermal_dir;
778
779 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
780 {
781         struct acpi_thermal *tz = seq->private;
782
783
784         if (!tz)
785                 goto end;
786
787         seq_puts(seq, "state:                   ");
788
789         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
790             && !tz->state.active)
791                 seq_puts(seq, "ok\n");
792         else {
793                 if (tz->state.critical)
794                         seq_puts(seq, "critical ");
795                 if (tz->state.hot)
796                         seq_puts(seq, "hot ");
797                 if (tz->state.passive)
798                         seq_puts(seq, "passive ");
799                 if (tz->state.active)
800                         seq_printf(seq, "active[%d]", tz->state.active_index);
801                 seq_puts(seq, "\n");
802         }
803
804       end:
805         return 0;
806 }
807
808 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
809 {
810         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
811 }
812
813 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
814 {
815         int result = 0;
816         struct acpi_thermal *tz = seq->private;
817
818
819         if (!tz)
820                 goto end;
821
822         result = acpi_thermal_get_temperature(tz);
823         if (result)
824                 goto end;
825
826         seq_printf(seq, "temperature:             %ld C\n",
827                    KELVIN_TO_CELSIUS(tz->temperature));
828
829       end:
830         return 0;
831 }
832
833 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
834 {
835         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
836 }
837
838 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
839 {
840         struct acpi_thermal *tz = seq->private;
841         int i = 0;
842         int j = 0;
843
844
845         if (!tz)
846                 goto end;
847
848         if (tz->trips.critical.flags.valid)
849                 seq_printf(seq, "critical (S5):           %ld C\n",
850                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
851
852         if (tz->trips.hot.flags.valid)
853                 seq_printf(seq, "hot (S4):                %ld C\n",
854                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
855
856         if (tz->trips.passive.flags.valid) {
857                 seq_printf(seq,
858                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
859                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
860                            tz->trips.passive.tc1, tz->trips.passive.tc2,
861                            tz->trips.passive.tsp);
862                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
863
864                         seq_printf(seq, "0x%p ",
865                                    tz->trips.passive.devices.handles[j]);
866                 }
867                 seq_puts(seq, "\n");
868         }
869
870         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
871                 if (!(tz->trips.active[i].flags.valid))
872                         break;
873                 seq_printf(seq, "active[%d]:               %ld C: devices=",
874                            i,
875                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
876                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
877                         seq_printf(seq, "0x%p ",
878                                    tz->trips.active[i].devices.handles[j]);
879                 seq_puts(seq, "\n");
880         }
881
882       end:
883         return 0;
884 }
885
886 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
887 {
888         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
889 }
890
891 static ssize_t
892 acpi_thermal_write_trip_points(struct file *file,
893                                const char __user * buffer,
894                                size_t count, loff_t * ppos)
895 {
896         struct seq_file *m = file->private_data;
897         struct acpi_thermal *tz = m->private;
898
899         char *limit_string;
900         int num, critical, hot, passive;
901         int *active;
902         int i = 0;
903
904
905         limit_string = kzalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
906         if (!limit_string)
907                 return -ENOMEM;
908
909         active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
910         if (!active) {
911                 kfree(limit_string);
912                 return -ENOMEM;
913         }
914
915         if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
916                 count = -EINVAL;
917                 goto end;
918         }
919
920         if (copy_from_user(limit_string, buffer, count)) {
921                 count = -EFAULT;
922                 goto end;
923         }
924
925         limit_string[count] = '\0';
926
927         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
928                      &critical, &hot, &passive,
929                      &active[0], &active[1], &active[2], &active[3], &active[4],
930                      &active[5], &active[6], &active[7], &active[8],
931                      &active[9]);
932         if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
933                 count = -EINVAL;
934                 goto end;
935         }
936
937         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
938         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
939         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
940         for (i = 0; i < num - 3; i++) {
941                 if (!(tz->trips.active[i].flags.valid))
942                         break;
943                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
944         }
945
946       end:
947         kfree(active);
948         kfree(limit_string);
949         return count;
950 }
951
952 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
953 {
954         struct acpi_thermal *tz = seq->private;
955
956
957         if (!tz)
958                 goto end;
959
960         if (!tz->flags.cooling_mode) {
961                 seq_puts(seq, "<setting not supported>\n");
962         }
963
964         if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
965                 seq_printf(seq, "cooling mode:  critical\n");
966         else
967                 seq_printf(seq, "cooling mode:  %s\n",
968                            tz->cooling_mode ? "passive" : "active");
969
970       end:
971         return 0;
972 }
973
974 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
975 {
976         return single_open(file, acpi_thermal_cooling_seq_show,
977                            PDE(inode)->data);
978 }
979
980 static ssize_t
981 acpi_thermal_write_cooling_mode(struct file *file,
982                                 const char __user * buffer,
983                                 size_t count, loff_t * ppos)
984 {
985         struct seq_file *m = file->private_data;
986         struct acpi_thermal *tz = m->private;
987         int result = 0;
988         char mode_string[12] = { '\0' };
989
990
991         if (!tz || (count > sizeof(mode_string) - 1))
992                 return -EINVAL;
993
994         if (!tz->flags.cooling_mode)
995                 return -ENODEV;
996
997         if (copy_from_user(mode_string, buffer, count))
998                 return -EFAULT;
999
1000         mode_string[count] = '\0';
1001
1002         result = acpi_thermal_set_cooling_mode(tz,
1003                                                simple_strtoul(mode_string, NULL,
1004                                                               0));
1005         if (result)
1006                 return result;
1007
1008         acpi_thermal_check(tz);
1009
1010         return count;
1011 }
1012
1013 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1014 {
1015         struct acpi_thermal *tz = seq->private;
1016
1017
1018         if (!tz)
1019                 goto end;
1020
1021         if (!tz->polling_frequency) {
1022                 seq_puts(seq, "<polling disabled>\n");
1023                 goto end;
1024         }
1025
1026         seq_printf(seq, "polling frequency:       %lu seconds\n",
1027                    (tz->polling_frequency / 10));
1028
1029       end:
1030         return 0;
1031 }
1032
1033 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1034 {
1035         return single_open(file, acpi_thermal_polling_seq_show,
1036                            PDE(inode)->data);
1037 }
1038
1039 static ssize_t
1040 acpi_thermal_write_polling(struct file *file,
1041                            const char __user * buffer,
1042                            size_t count, loff_t * ppos)
1043 {
1044         struct seq_file *m = file->private_data;
1045         struct acpi_thermal *tz = m->private;
1046         int result = 0;
1047         char polling_string[12] = { '\0' };
1048         int seconds = 0;
1049
1050
1051         if (!tz || (count > sizeof(polling_string) - 1))
1052                 return -EINVAL;
1053
1054         if (copy_from_user(polling_string, buffer, count))
1055                 return -EFAULT;
1056
1057         polling_string[count] = '\0';
1058
1059         seconds = simple_strtoul(polling_string, NULL, 0);
1060
1061         result = acpi_thermal_set_polling(tz, seconds);
1062         if (result)
1063                 return result;
1064
1065         acpi_thermal_check(tz);
1066
1067         return count;
1068 }
1069
1070 static int acpi_thermal_add_fs(struct acpi_device *device)
1071 {
1072         struct proc_dir_entry *entry = NULL;
1073
1074
1075         if (!acpi_device_dir(device)) {
1076                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1077                                                      acpi_thermal_dir);
1078                 if (!acpi_device_dir(device))
1079                         return -ENODEV;
1080                 acpi_device_dir(device)->owner = THIS_MODULE;
1081         }
1082
1083         /* 'state' [R] */
1084         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1085                                   S_IRUGO, acpi_device_dir(device));
1086         if (!entry)
1087                 return -ENODEV;
1088         else {
1089                 entry->proc_fops = &acpi_thermal_state_fops;
1090                 entry->data = acpi_driver_data(device);
1091                 entry->owner = THIS_MODULE;
1092         }
1093
1094         /* 'temperature' [R] */
1095         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1096                                   S_IRUGO, acpi_device_dir(device));
1097         if (!entry)
1098                 return -ENODEV;
1099         else {
1100                 entry->proc_fops = &acpi_thermal_temp_fops;
1101                 entry->data = acpi_driver_data(device);
1102                 entry->owner = THIS_MODULE;
1103         }
1104
1105         /* 'trip_points' [R/W] */
1106         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1107                                   S_IFREG | S_IRUGO | S_IWUSR,
1108                                   acpi_device_dir(device));
1109         if (!entry)
1110                 return -ENODEV;
1111         else {
1112                 entry->proc_fops = &acpi_thermal_trip_fops;
1113                 entry->data = acpi_driver_data(device);
1114                 entry->owner = THIS_MODULE;
1115         }
1116
1117         /* 'cooling_mode' [R/W] */
1118         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1119                                   S_IFREG | S_IRUGO | S_IWUSR,
1120                                   acpi_device_dir(device));
1121         if (!entry)
1122                 return -ENODEV;
1123         else {
1124                 entry->proc_fops = &acpi_thermal_cooling_fops;
1125                 entry->data = acpi_driver_data(device);
1126                 entry->owner = THIS_MODULE;
1127         }
1128
1129         /* 'polling_frequency' [R/W] */
1130         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1131                                   S_IFREG | S_IRUGO | S_IWUSR,
1132                                   acpi_device_dir(device));
1133         if (!entry)
1134                 return -ENODEV;
1135         else {
1136                 entry->proc_fops = &acpi_thermal_polling_fops;
1137                 entry->data = acpi_driver_data(device);
1138                 entry->owner = THIS_MODULE;
1139         }
1140
1141         return 0;
1142 }
1143
1144 static int acpi_thermal_remove_fs(struct acpi_device *device)
1145 {
1146
1147         if (acpi_device_dir(device)) {
1148                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1149                                   acpi_device_dir(device));
1150                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1151                                   acpi_device_dir(device));
1152                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1153                                   acpi_device_dir(device));
1154                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1155                                   acpi_device_dir(device));
1156                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1157                                   acpi_device_dir(device));
1158                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1159                 acpi_device_dir(device) = NULL;
1160         }
1161
1162         return 0;
1163 }
1164
1165 /* --------------------------------------------------------------------------
1166                                  Driver Interface
1167    -------------------------------------------------------------------------- */
1168
1169 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1170 {
1171         struct acpi_thermal *tz = data;
1172         struct acpi_device *device = NULL;
1173
1174
1175         if (!tz)
1176                 return;
1177
1178         device = tz->device;
1179
1180         switch (event) {
1181         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1182                 acpi_thermal_check(tz);
1183                 break;
1184         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1185                 acpi_thermal_get_trip_points(tz);
1186                 acpi_thermal_check(tz);
1187                 acpi_bus_generate_event(device, event, 0);
1188                 break;
1189         case ACPI_THERMAL_NOTIFY_DEVICES:
1190                 if (tz->flags.devices)
1191                         acpi_thermal_get_devices(tz);
1192                 acpi_bus_generate_event(device, event, 0);
1193                 break;
1194         default:
1195                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1196                                   "Unsupported event [0x%x]\n", event));
1197                 break;
1198         }
1199
1200         return;
1201 }
1202
1203 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1204 {
1205         int result = 0;
1206
1207
1208         if (!tz)
1209                 return -EINVAL;
1210
1211         /* Get temperature [_TMP] (required) */
1212         result = acpi_thermal_get_temperature(tz);
1213         if (result)
1214                 return result;
1215
1216         /* Get trip points [_CRT, _PSV, etc.] (required) */
1217         result = acpi_thermal_get_trip_points(tz);
1218         if (result)
1219                 return result;
1220
1221         /* Set the cooling mode [_SCP] to active cooling (default) */
1222         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1223         if (!result)
1224                 tz->flags.cooling_mode = 1;
1225         else {
1226                 /* Oh,we have not _SCP method.
1227                    Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1228                 tz->flags.cooling_mode = 0;
1229                 if (tz->trips.active[0].flags.valid
1230                     && tz->trips.passive.flags.valid) {
1231                         if (tz->trips.passive.temperature >
1232                             tz->trips.active[0].temperature)
1233                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1234                         else
1235                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1236                 } else if (!tz->trips.active[0].flags.valid
1237                            && tz->trips.passive.flags.valid) {
1238                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1239                 } else if (tz->trips.active[0].flags.valid
1240                            && !tz->trips.passive.flags.valid) {
1241                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1242                 } else {
1243                         /* _ACx and _PSV are optional, but _CRT is required */
1244                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1245                 }
1246         }
1247
1248         /* Get default polling frequency [_TZP] (optional) */
1249         if (tzp)
1250                 tz->polling_frequency = tzp;
1251         else
1252                 acpi_thermal_get_polling_frequency(tz);
1253
1254         /* Get devices in this thermal zone [_TZD] (optional) */
1255         result = acpi_thermal_get_devices(tz);
1256         if (!result)
1257                 tz->flags.devices = 1;
1258
1259         return 0;
1260 }
1261
1262 static int acpi_thermal_add(struct acpi_device *device)
1263 {
1264         int result = 0;
1265         acpi_status status = AE_OK;
1266         struct acpi_thermal *tz = NULL;
1267
1268
1269         if (!device)
1270                 return -EINVAL;
1271
1272         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1273         if (!tz)
1274                 return -ENOMEM;
1275
1276         tz->device = device;
1277         strcpy(tz->name, device->pnp.bus_id);
1278         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1279         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1280         acpi_driver_data(device) = tz;
1281
1282         result = acpi_thermal_get_info(tz);
1283         if (result)
1284                 goto end;
1285
1286         result = acpi_thermal_add_fs(device);
1287         if (result)
1288                 goto end;
1289
1290         init_timer(&tz->timer);
1291
1292         acpi_thermal_check(tz);
1293
1294         status = acpi_install_notify_handler(device->handle,
1295                                              ACPI_DEVICE_NOTIFY,
1296                                              acpi_thermal_notify, tz);
1297         if (ACPI_FAILURE(status)) {
1298                 result = -ENODEV;
1299                 goto end;
1300         }
1301
1302         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1303                acpi_device_name(device), acpi_device_bid(device),
1304                KELVIN_TO_CELSIUS(tz->temperature));
1305
1306       end:
1307         if (result) {
1308                 acpi_thermal_remove_fs(device);
1309                 kfree(tz);
1310         }
1311
1312         return result;
1313 }
1314
1315 static int acpi_thermal_remove(struct acpi_device *device, int type)
1316 {
1317         acpi_status status = AE_OK;
1318         struct acpi_thermal *tz = NULL;
1319
1320
1321         if (!device || !acpi_driver_data(device))
1322                 return -EINVAL;
1323
1324         tz = acpi_driver_data(device);
1325
1326         /* avoid timer adding new defer task */
1327         tz->zombie = 1;
1328         /* wait for running timer (on other CPUs) finish */
1329         del_timer_sync(&(tz->timer));
1330         /* synchronize deferred task */
1331         acpi_os_wait_events_complete(NULL);
1332         /* deferred task may reinsert timer */
1333         del_timer_sync(&(tz->timer));
1334
1335         status = acpi_remove_notify_handler(device->handle,
1336                                             ACPI_DEVICE_NOTIFY,
1337                                             acpi_thermal_notify);
1338
1339         /* Terminate policy */
1340         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1341                 tz->trips.passive.flags.enabled = 0;
1342                 acpi_thermal_passive(tz);
1343         }
1344         if (tz->trips.active[0].flags.valid
1345             && tz->trips.active[0].flags.enabled) {
1346                 tz->trips.active[0].flags.enabled = 0;
1347                 acpi_thermal_active(tz);
1348         }
1349
1350         acpi_thermal_remove_fs(device);
1351
1352         kfree(tz);
1353         return 0;
1354 }
1355
1356 static int acpi_thermal_resume(struct acpi_device *device)
1357 {
1358         struct acpi_thermal *tz = NULL;
1359         int i;
1360
1361         if (!device || !acpi_driver_data(device))
1362                 return -EINVAL;
1363
1364         tz = acpi_driver_data(device);
1365
1366         acpi_thermal_get_temperature(tz);
1367
1368         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1369                 if (tz->trips.active[i].flags.valid) {
1370                         tz->temperature = tz->trips.active[i].temperature;
1371                         tz->trips.active[i].flags.enabled = 0;
1372
1373                         acpi_thermal_active(tz);
1374
1375                         tz->state.active |= tz->trips.active[i].flags.enabled;
1376                         tz->state.active_index = i;
1377                 }
1378         }
1379
1380         acpi_thermal_check(tz);
1381
1382         return AE_OK;
1383 }
1384
1385 static int __init acpi_thermal_init(void)
1386 {
1387         int result = 0;
1388
1389
1390         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1391         if (!acpi_thermal_dir)
1392                 return -ENODEV;
1393         acpi_thermal_dir->owner = THIS_MODULE;
1394
1395         result = acpi_bus_register_driver(&acpi_thermal_driver);
1396         if (result < 0) {
1397                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1398                 return -ENODEV;
1399         }
1400
1401         return 0;
1402 }
1403
1404 static void __exit acpi_thermal_exit(void)
1405 {
1406
1407         acpi_bus_unregister_driver(&acpi_thermal_driver);
1408
1409         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1410
1411         return;
1412 }
1413
1414 module_init(acpi_thermal_init);
1415 module_exit(acpi_thermal_exit);