ACPI: delete tracing macros from drivers/acpi/*.c
[linux-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/sched.h>
40 #include <linux/kmod.h>
41 #include <linux/seq_file.h>
42 #include <asm/uaccess.h>
43
44 #include <acpi/acpi_bus.h>
45 #include <acpi/acpi_drivers.h>
46
47 #define ACPI_THERMAL_COMPONENT          0x04000000
48 #define ACPI_THERMAL_CLASS              "thermal_zone"
49 #define ACPI_THERMAL_DRIVER_NAME        "ACPI Thermal Zone Driver"
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("acpi_thermal")
74
75 MODULE_AUTHOR("Paul Diefenbaugh");
76 MODULE_DESCRIPTION(ACPI_THERMAL_DRIVER_NAME);
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, int state);
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 = ACPI_THERMAL_DRIVER_NAME,
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         acpi_handle handle;
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 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 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 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 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 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->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->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));
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->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->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->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->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->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->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->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->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->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->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->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         int result = 0;
457         struct acpi_device *device = NULL;
458
459
460         if (!tz || !tz->trips.critical.flags.valid)
461                 return -EINVAL;
462
463         if (tz->temperature >= tz->trips.critical.temperature) {
464                 printk(KERN_WARNING PREFIX "Critical trip point\n");
465                 tz->trips.critical.flags.enabled = 1;
466         } else if (tz->trips.critical.flags.enabled)
467                 tz->trips.critical.flags.enabled = 0;
468
469         result = acpi_bus_get_device(tz->handle, &device);
470         if (result)
471                 return result;
472
473         printk(KERN_EMERG
474                "Critical temperature reached (%ld C), shutting down.\n",
475                KELVIN_TO_CELSIUS(tz->temperature));
476         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL,
477                                 tz->trips.critical.flags.enabled);
478
479         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
480
481         return 0;
482 }
483
484 static int acpi_thermal_hot(struct acpi_thermal *tz)
485 {
486         int result = 0;
487         struct acpi_device *device = NULL;
488
489
490         if (!tz || !tz->trips.hot.flags.valid)
491                 return -EINVAL;
492
493         if (tz->temperature >= tz->trips.hot.temperature) {
494                 printk(KERN_WARNING PREFIX "Hot trip point\n");
495                 tz->trips.hot.flags.enabled = 1;
496         } else if (tz->trips.hot.flags.enabled)
497                 tz->trips.hot.flags.enabled = 0;
498
499         result = acpi_bus_get_device(tz->handle, &device);
500         if (result)
501                 return result;
502
503         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT,
504                                 tz->trips.hot.flags.enabled);
505
506         /* TBD: Call user-mode "sleep(S4)" function */
507
508         return 0;
509 }
510
511 static void acpi_thermal_passive(struct acpi_thermal *tz)
512 {
513         int result = 1;
514         struct acpi_thermal_passive *passive = NULL;
515         int trend = 0;
516         int i = 0;
517
518
519         if (!tz || !tz->trips.passive.flags.valid)
520                 return;
521
522         passive = &(tz->trips.passive);
523
524         /*
525          * Above Trip?
526          * -----------
527          * Calculate the thermal trend (using the passive cooling equation)
528          * and modify the performance limit for all passive cooling devices
529          * accordingly.  Note that we assume symmetry.
530          */
531         if (tz->temperature >= passive->temperature) {
532                 trend =
533                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
534                     (passive->tc2 * (tz->temperature - passive->temperature));
535                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
536                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
537                                   trend, passive->tc1, tz->temperature,
538                                   tz->last_temperature, passive->tc2,
539                                   tz->temperature, passive->temperature));
540                 passive->flags.enabled = 1;
541                 /* Heating up? */
542                 if (trend > 0)
543                         for (i = 0; i < passive->devices.count; i++)
544                                 acpi_processor_set_thermal_limit(passive->
545                                                                  devices.
546                                                                  handles[i],
547                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
548                 /* Cooling off? */
549                 else if (trend < 0) {
550                         for (i = 0; i < passive->devices.count; i++)
551                                 /*
552                                  * assume that we are on highest
553                                  * freq/lowest thrott and can leave
554                                  * passive mode, even in error case
555                                  */
556                                 if (!acpi_processor_set_thermal_limit
557                                     (passive->devices.handles[i],
558                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
559                                         result = 0;
560                         /*
561                          * Leave cooling mode, even if the temp might
562                          * higher than trip point This is because some
563                          * machines might have long thermal polling
564                          * frequencies (tsp) defined. We will fall back
565                          * into passive mode in next cycle (probably quicker)
566                          */
567                         if (result) {
568                                 passive->flags.enabled = 0;
569                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
570                                                   "Disabling passive cooling, still above threshold,"
571                                                   " but we are cooling down\n"));
572                         }
573                 }
574                 return;
575         }
576
577         /*
578          * Below Trip?
579          * -----------
580          * Implement passive cooling hysteresis to slowly increase performance
581          * and avoid thrashing around the passive trip point.  Note that we
582          * assume symmetry.
583          */
584         if (!passive->flags.enabled)
585                 return;
586         for (i = 0; i < passive->devices.count; i++)
587                 if (!acpi_processor_set_thermal_limit
588                     (passive->devices.handles[i],
589                      ACPI_PROCESSOR_LIMIT_DECREMENT))
590                         result = 0;
591         if (result) {
592                 passive->flags.enabled = 0;
593                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
594                                   "Disabling passive cooling (zone is cool)\n"));
595         }
596 }
597
598 static void acpi_thermal_active(struct acpi_thermal *tz)
599 {
600         int result = 0;
601         struct acpi_thermal_active *active = NULL;
602         int i = 0;
603         int j = 0;
604         unsigned long maxtemp = 0;
605
606
607         if (!tz)
608                 return;
609
610         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
611                 active = &(tz->trips.active[i]);
612                 if (!active || !active->flags.valid)
613                         break;
614                 if (tz->temperature >= active->temperature) {
615                         /*
616                          * Above Threshold?
617                          * ----------------
618                          * If not already enabled, turn ON all cooling devices
619                          * associated with this active threshold.
620                          */
621                         if (active->temperature > maxtemp)
622                                 tz->state.active_index = i;
623                         maxtemp = active->temperature;
624                         if (active->flags.enabled)
625                                 continue;
626                         for (j = 0; j < active->devices.count; j++) {
627                                 result =
628                                     acpi_bus_set_power(active->devices.
629                                                        handles[j],
630                                                        ACPI_STATE_D0);
631                                 if (result) {
632                                         printk(KERN_WARNING PREFIX
633                                                       "Unable to turn cooling device [%p] 'on'\n",
634                                                       active->devices.
635                                                       handles[j]);
636                                         continue;
637                                 }
638                                 active->flags.enabled = 1;
639                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
640                                                   "Cooling device [%p] now 'on'\n",
641                                                   active->devices.handles[j]));
642                         }
643                         continue;
644                 }
645                 if (!active->flags.enabled)
646                         continue;
647                 /*
648                  * Below Threshold?
649                  * ----------------
650                  * Turn OFF all cooling devices associated with this
651                  * threshold.
652                  */
653                 for (j = 0; j < active->devices.count; j++) {
654                         result = acpi_bus_set_power(active->devices.handles[j],
655                                                     ACPI_STATE_D3);
656                         if (result) {
657                                 printk(KERN_WARNING PREFIX
658                                               "Unable to turn cooling device [%p] 'off'\n",
659                                               active->devices.handles[j]);
660                                 continue;
661                         }
662                         active->flags.enabled = 0;
663                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
664                                           "Cooling device [%p] now 'off'\n",
665                                           active->devices.handles[j]));
666                 }
667         }
668 }
669
670 static void acpi_thermal_check(void *context);
671
672 static void acpi_thermal_run(unsigned long data)
673 {
674         struct acpi_thermal *tz = (struct acpi_thermal *)data;
675         if (!tz->zombie)
676                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
677 }
678
679 static void acpi_thermal_check(void *data)
680 {
681         int result = 0;
682         struct acpi_thermal *tz = (struct acpi_thermal *)data;
683         unsigned long sleep_time = 0;
684         int i = 0;
685         struct acpi_thermal_state state;
686
687
688         if (!tz) {
689                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
690                 return;
691         }
692
693         state = tz->state;
694
695         result = acpi_thermal_get_temperature(tz);
696         if (result)
697                 return;
698
699         memset(&tz->state, 0, sizeof(tz->state));
700
701         /*
702          * Check Trip Points
703          * -----------------
704          * Compare the current temperature to the trip point values to see
705          * if we've entered one of the thermal policy states.  Note that
706          * this function determines when a state is entered, but the 
707          * individual policy decides when it is exited (e.g. hysteresis).
708          */
709         if (tz->trips.critical.flags.valid)
710                 state.critical |=
711                     (tz->temperature >= tz->trips.critical.temperature);
712         if (tz->trips.hot.flags.valid)
713                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
714         if (tz->trips.passive.flags.valid)
715                 state.passive |=
716                     (tz->temperature >= tz->trips.passive.temperature);
717         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
718                 if (tz->trips.active[i].flags.valid)
719                         state.active |=
720                             (tz->temperature >=
721                              tz->trips.active[i].temperature);
722
723         /*
724          * Invoke Policy
725          * -------------
726          * Separated from the above check to allow individual policy to 
727          * determine when to exit a given state.
728          */
729         if (state.critical)
730                 acpi_thermal_critical(tz);
731         if (state.hot)
732                 acpi_thermal_hot(tz);
733         if (state.passive)
734                 acpi_thermal_passive(tz);
735         if (state.active)
736                 acpi_thermal_active(tz);
737
738         /*
739          * Calculate State
740          * ---------------
741          * Again, separated from the above two to allow independent policy
742          * decisions.
743          */
744         tz->state.critical = tz->trips.critical.flags.enabled;
745         tz->state.hot = tz->trips.hot.flags.enabled;
746         tz->state.passive = tz->trips.passive.flags.enabled;
747         tz->state.active = 0;
748         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
749                 tz->state.active |= tz->trips.active[i].flags.enabled;
750
751         /*
752          * Calculate Sleep Time
753          * --------------------
754          * If we're in the passive state, use _TSP's value.  Otherwise
755          * use the default polling frequency (e.g. _TZP).  If no polling
756          * frequency is specified then we'll wait forever (at least until
757          * a thermal event occurs).  Note that _TSP and _TZD values are
758          * given in 1/10th seconds (we must covert to milliseconds).
759          */
760         if (tz->state.passive)
761                 sleep_time = tz->trips.passive.tsp * 100;
762         else if (tz->polling_frequency > 0)
763                 sleep_time = tz->polling_frequency * 100;
764
765         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
766                           tz->name, tz->temperature, sleep_time));
767
768         /*
769          * Schedule Next Poll
770          * ------------------
771          */
772         if (!sleep_time) {
773                 if (timer_pending(&(tz->timer)))
774                         del_timer(&(tz->timer));
775         } else {
776                 if (timer_pending(&(tz->timer)))
777                         mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
778                 else {
779                         tz->timer.data = (unsigned long)tz;
780                         tz->timer.function = acpi_thermal_run;
781                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
782                         add_timer(&(tz->timer));
783                 }
784         }
785
786         return;
787 }
788
789 /* --------------------------------------------------------------------------
790                               FS Interface (/proc)
791    -------------------------------------------------------------------------- */
792
793 static struct proc_dir_entry *acpi_thermal_dir;
794
795 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
796 {
797         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
798
799
800         if (!tz)
801                 goto end;
802
803         seq_puts(seq, "state:                   ");
804
805         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
806             && !tz->state.active)
807                 seq_puts(seq, "ok\n");
808         else {
809                 if (tz->state.critical)
810                         seq_puts(seq, "critical ");
811                 if (tz->state.hot)
812                         seq_puts(seq, "hot ");
813                 if (tz->state.passive)
814                         seq_puts(seq, "passive ");
815                 if (tz->state.active)
816                         seq_printf(seq, "active[%d]", tz->state.active_index);
817                 seq_puts(seq, "\n");
818         }
819
820       end:
821         return 0;
822 }
823
824 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
825 {
826         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
827 }
828
829 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
830 {
831         int result = 0;
832         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
833
834
835         if (!tz)
836                 goto end;
837
838         result = acpi_thermal_get_temperature(tz);
839         if (result)
840                 goto end;
841
842         seq_printf(seq, "temperature:             %ld C\n",
843                    KELVIN_TO_CELSIUS(tz->temperature));
844
845       end:
846         return 0;
847 }
848
849 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
850 {
851         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
852 }
853
854 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
855 {
856         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
857         int i = 0;
858         int j = 0;
859
860
861         if (!tz)
862                 goto end;
863
864         if (tz->trips.critical.flags.valid)
865                 seq_printf(seq, "critical (S5):           %ld C\n",
866                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
867
868         if (tz->trips.hot.flags.valid)
869                 seq_printf(seq, "hot (S4):                %ld C\n",
870                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
871
872         if (tz->trips.passive.flags.valid) {
873                 seq_printf(seq,
874                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
875                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
876                            tz->trips.passive.tc1, tz->trips.passive.tc2,
877                            tz->trips.passive.tsp);
878                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
879
880                         seq_printf(seq, "0x%p ",
881                                    tz->trips.passive.devices.handles[j]);
882                 }
883                 seq_puts(seq, "\n");
884         }
885
886         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
887                 if (!(tz->trips.active[i].flags.valid))
888                         break;
889                 seq_printf(seq, "active[%d]:               %ld C: devices=",
890                            i,
891                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
892                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
893                         seq_printf(seq, "0x%p ",
894                                    tz->trips.active[i].devices.handles[j]);
895                 seq_puts(seq, "\n");
896         }
897
898       end:
899         return 0;
900 }
901
902 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
903 {
904         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
905 }
906
907 static ssize_t
908 acpi_thermal_write_trip_points(struct file *file,
909                                const char __user * buffer,
910                                size_t count, loff_t * ppos)
911 {
912         struct seq_file *m = (struct seq_file *)file->private_data;
913         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
914
915         char *limit_string;
916         int num, critical, hot, passive;
917         int *active;
918         int i = 0;
919
920
921         limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
922         if (!limit_string)
923                 return -ENOMEM;
924
925         memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN);
926
927         active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
928         if (!active) {
929                 kfree(limit_string);
930                 return -ENOMEM;
931         }
932
933         if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
934                 count = -EINVAL;
935                 goto end;
936         }
937
938         if (copy_from_user(limit_string, buffer, count)) {
939                 count = -EFAULT;
940                 goto end;
941         }
942
943         limit_string[count] = '\0';
944
945         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
946                      &critical, &hot, &passive,
947                      &active[0], &active[1], &active[2], &active[3], &active[4],
948                      &active[5], &active[6], &active[7], &active[8],
949                      &active[9]);
950         if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
951                 count = -EINVAL;
952                 goto end;
953         }
954
955         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
956         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
957         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
958         for (i = 0; i < num - 3; i++) {
959                 if (!(tz->trips.active[i].flags.valid))
960                         break;
961                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
962         }
963
964       end:
965         kfree(active);
966         kfree(limit_string);
967         return count;
968 }
969
970 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
971 {
972         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
973
974
975         if (!tz)
976                 goto end;
977
978         if (!tz->flags.cooling_mode) {
979                 seq_puts(seq, "<setting not supported>\n");
980         }
981
982         if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
983                 seq_printf(seq, "cooling mode:  critical\n");
984         else
985                 seq_printf(seq, "cooling mode:  %s\n",
986                            tz->cooling_mode ? "passive" : "active");
987
988       end:
989         return 0;
990 }
991
992 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
993 {
994         return single_open(file, acpi_thermal_cooling_seq_show,
995                            PDE(inode)->data);
996 }
997
998 static ssize_t
999 acpi_thermal_write_cooling_mode(struct file *file,
1000                                 const char __user * buffer,
1001                                 size_t count, loff_t * ppos)
1002 {
1003         struct seq_file *m = (struct seq_file *)file->private_data;
1004         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1005         int result = 0;
1006         char mode_string[12] = { '\0' };
1007
1008
1009         if (!tz || (count > sizeof(mode_string) - 1))
1010                 return -EINVAL;
1011
1012         if (!tz->flags.cooling_mode)
1013                 return -ENODEV;
1014
1015         if (copy_from_user(mode_string, buffer, count))
1016                 return -EFAULT;
1017
1018         mode_string[count] = '\0';
1019
1020         result = acpi_thermal_set_cooling_mode(tz,
1021                                                simple_strtoul(mode_string, NULL,
1022                                                               0));
1023         if (result)
1024                 return result;
1025
1026         acpi_thermal_check(tz);
1027
1028         return count;
1029 }
1030
1031 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1032 {
1033         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
1034
1035
1036         if (!tz)
1037                 goto end;
1038
1039         if (!tz->polling_frequency) {
1040                 seq_puts(seq, "<polling disabled>\n");
1041                 goto end;
1042         }
1043
1044         seq_printf(seq, "polling frequency:       %lu seconds\n",
1045                    (tz->polling_frequency / 10));
1046
1047       end:
1048         return 0;
1049 }
1050
1051 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1052 {
1053         return single_open(file, acpi_thermal_polling_seq_show,
1054                            PDE(inode)->data);
1055 }
1056
1057 static ssize_t
1058 acpi_thermal_write_polling(struct file *file,
1059                            const char __user * buffer,
1060                            size_t count, loff_t * ppos)
1061 {
1062         struct seq_file *m = (struct seq_file *)file->private_data;
1063         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1064         int result = 0;
1065         char polling_string[12] = { '\0' };
1066         int seconds = 0;
1067
1068
1069         if (!tz || (count > sizeof(polling_string) - 1))
1070                 return -EINVAL;
1071
1072         if (copy_from_user(polling_string, buffer, count))
1073                 return -EFAULT;
1074
1075         polling_string[count] = '\0';
1076
1077         seconds = simple_strtoul(polling_string, NULL, 0);
1078
1079         result = acpi_thermal_set_polling(tz, seconds);
1080         if (result)
1081                 return result;
1082
1083         acpi_thermal_check(tz);
1084
1085         return count;
1086 }
1087
1088 static int acpi_thermal_add_fs(struct acpi_device *device)
1089 {
1090         struct proc_dir_entry *entry = NULL;
1091
1092
1093         if (!acpi_device_dir(device)) {
1094                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1095                                                      acpi_thermal_dir);
1096                 if (!acpi_device_dir(device))
1097                         return -ENODEV;
1098                 acpi_device_dir(device)->owner = THIS_MODULE;
1099         }
1100
1101         /* 'state' [R] */
1102         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1103                                   S_IRUGO, acpi_device_dir(device));
1104         if (!entry)
1105                 return -ENODEV;
1106         else {
1107                 entry->proc_fops = &acpi_thermal_state_fops;
1108                 entry->data = acpi_driver_data(device);
1109                 entry->owner = THIS_MODULE;
1110         }
1111
1112         /* 'temperature' [R] */
1113         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1114                                   S_IRUGO, acpi_device_dir(device));
1115         if (!entry)
1116                 return -ENODEV;
1117         else {
1118                 entry->proc_fops = &acpi_thermal_temp_fops;
1119                 entry->data = acpi_driver_data(device);
1120                 entry->owner = THIS_MODULE;
1121         }
1122
1123         /* 'trip_points' [R/W] */
1124         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1125                                   S_IFREG | S_IRUGO | S_IWUSR,
1126                                   acpi_device_dir(device));
1127         if (!entry)
1128                 return -ENODEV;
1129         else {
1130                 entry->proc_fops = &acpi_thermal_trip_fops;
1131                 entry->data = acpi_driver_data(device);
1132                 entry->owner = THIS_MODULE;
1133         }
1134
1135         /* 'cooling_mode' [R/W] */
1136         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1137                                   S_IFREG | S_IRUGO | S_IWUSR,
1138                                   acpi_device_dir(device));
1139         if (!entry)
1140                 return -ENODEV;
1141         else {
1142                 entry->proc_fops = &acpi_thermal_cooling_fops;
1143                 entry->data = acpi_driver_data(device);
1144                 entry->owner = THIS_MODULE;
1145         }
1146
1147         /* 'polling_frequency' [R/W] */
1148         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1149                                   S_IFREG | S_IRUGO | S_IWUSR,
1150                                   acpi_device_dir(device));
1151         if (!entry)
1152                 return -ENODEV;
1153         else {
1154                 entry->proc_fops = &acpi_thermal_polling_fops;
1155                 entry->data = acpi_driver_data(device);
1156                 entry->owner = THIS_MODULE;
1157         }
1158
1159         return 0;
1160 }
1161
1162 static int acpi_thermal_remove_fs(struct acpi_device *device)
1163 {
1164
1165         if (acpi_device_dir(device)) {
1166                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1167                                   acpi_device_dir(device));
1168                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1169                                   acpi_device_dir(device));
1170                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1171                                   acpi_device_dir(device));
1172                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1173                                   acpi_device_dir(device));
1174                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1175                                   acpi_device_dir(device));
1176                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1177                 acpi_device_dir(device) = NULL;
1178         }
1179
1180         return 0;
1181 }
1182
1183 /* --------------------------------------------------------------------------
1184                                  Driver Interface
1185    -------------------------------------------------------------------------- */
1186
1187 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1188 {
1189         struct acpi_thermal *tz = (struct acpi_thermal *)data;
1190         struct acpi_device *device = NULL;
1191
1192
1193         if (!tz)
1194                 return;
1195
1196         if (acpi_bus_get_device(tz->handle, &device))
1197                 return;
1198
1199         switch (event) {
1200         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1201                 acpi_thermal_check(tz);
1202                 break;
1203         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1204                 acpi_thermal_get_trip_points(tz);
1205                 acpi_thermal_check(tz);
1206                 acpi_bus_generate_event(device, event, 0);
1207                 break;
1208         case ACPI_THERMAL_NOTIFY_DEVICES:
1209                 if (tz->flags.devices)
1210                         acpi_thermal_get_devices(tz);
1211                 acpi_bus_generate_event(device, event, 0);
1212                 break;
1213         default:
1214                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1215                                   "Unsupported event [0x%x]\n", event));
1216                 break;
1217         }
1218
1219         return;
1220 }
1221
1222 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1223 {
1224         int result = 0;
1225
1226
1227         if (!tz)
1228                 return -EINVAL;
1229
1230         /* Get temperature [_TMP] (required) */
1231         result = acpi_thermal_get_temperature(tz);
1232         if (result)
1233                 return result;
1234
1235         /* Get trip points [_CRT, _PSV, etc.] (required) */
1236         result = acpi_thermal_get_trip_points(tz);
1237         if (result)
1238                 return result;
1239
1240         /* Set the cooling mode [_SCP] to active cooling (default) */
1241         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1242         if (!result)
1243                 tz->flags.cooling_mode = 1;
1244         else {
1245                 /* Oh,we have not _SCP method.
1246                    Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1247                 tz->flags.cooling_mode = 0;
1248                 if (tz->trips.active[0].flags.valid
1249                     && tz->trips.passive.flags.valid) {
1250                         if (tz->trips.passive.temperature >
1251                             tz->trips.active[0].temperature)
1252                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1253                         else
1254                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1255                 } else if (!tz->trips.active[0].flags.valid
1256                            && tz->trips.passive.flags.valid) {
1257                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1258                 } else if (tz->trips.active[0].flags.valid
1259                            && !tz->trips.passive.flags.valid) {
1260                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1261                 } else {
1262                         /* _ACx and _PSV are optional, but _CRT is required */
1263                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1264                 }
1265         }
1266
1267         /* Get default polling frequency [_TZP] (optional) */
1268         if (tzp)
1269                 tz->polling_frequency = tzp;
1270         else
1271                 acpi_thermal_get_polling_frequency(tz);
1272
1273         /* Get devices in this thermal zone [_TZD] (optional) */
1274         result = acpi_thermal_get_devices(tz);
1275         if (!result)
1276                 tz->flags.devices = 1;
1277
1278         return 0;
1279 }
1280
1281 static int acpi_thermal_add(struct acpi_device *device)
1282 {
1283         int result = 0;
1284         acpi_status status = AE_OK;
1285         struct acpi_thermal *tz = NULL;
1286
1287
1288         if (!device)
1289                 return -EINVAL;
1290
1291         tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1292         if (!tz)
1293                 return -ENOMEM;
1294         memset(tz, 0, sizeof(struct acpi_thermal));
1295
1296         tz->handle = device->handle;
1297         strcpy(tz->name, device->pnp.bus_id);
1298         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1299         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1300         acpi_driver_data(device) = tz;
1301
1302         result = acpi_thermal_get_info(tz);
1303         if (result)
1304                 goto end;
1305
1306         result = acpi_thermal_add_fs(device);
1307         if (result)
1308                 goto end;
1309
1310         init_timer(&tz->timer);
1311
1312         acpi_thermal_check(tz);
1313
1314         status = acpi_install_notify_handler(tz->handle,
1315                                              ACPI_DEVICE_NOTIFY,
1316                                              acpi_thermal_notify, tz);
1317         if (ACPI_FAILURE(status)) {
1318                 result = -ENODEV;
1319                 goto end;
1320         }
1321
1322         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1323                acpi_device_name(device), acpi_device_bid(device),
1324                KELVIN_TO_CELSIUS(tz->temperature));
1325
1326       end:
1327         if (result) {
1328                 acpi_thermal_remove_fs(device);
1329                 kfree(tz);
1330         }
1331
1332         return result;
1333 }
1334
1335 static int acpi_thermal_remove(struct acpi_device *device, int type)
1336 {
1337         acpi_status status = AE_OK;
1338         struct acpi_thermal *tz = NULL;
1339
1340
1341         if (!device || !acpi_driver_data(device))
1342                 return -EINVAL;
1343
1344         tz = (struct acpi_thermal *)acpi_driver_data(device);
1345
1346         /* avoid timer adding new defer task */
1347         tz->zombie = 1;
1348         /* wait for running timer (on other CPUs) finish */
1349         del_timer_sync(&(tz->timer));
1350         /* synchronize deferred task */
1351         acpi_os_wait_events_complete(NULL);
1352         /* deferred task may reinsert timer */
1353         del_timer_sync(&(tz->timer));
1354
1355         status = acpi_remove_notify_handler(tz->handle,
1356                                             ACPI_DEVICE_NOTIFY,
1357                                             acpi_thermal_notify);
1358
1359         /* Terminate policy */
1360         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1361                 tz->trips.passive.flags.enabled = 0;
1362                 acpi_thermal_passive(tz);
1363         }
1364         if (tz->trips.active[0].flags.valid
1365             && tz->trips.active[0].flags.enabled) {
1366                 tz->trips.active[0].flags.enabled = 0;
1367                 acpi_thermal_active(tz);
1368         }
1369
1370         acpi_thermal_remove_fs(device);
1371
1372         kfree(tz);
1373         return 0;
1374 }
1375
1376 static int acpi_thermal_resume(struct acpi_device *device, int state)
1377 {
1378         struct acpi_thermal *tz = NULL;
1379
1380         if (!device || !acpi_driver_data(device))
1381                 return -EINVAL;
1382
1383         tz = (struct acpi_thermal *)acpi_driver_data(device);
1384
1385         acpi_thermal_check(tz);
1386
1387         return AE_OK;
1388 }
1389
1390 static int __init acpi_thermal_init(void)
1391 {
1392         int result = 0;
1393
1394
1395         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1396         if (!acpi_thermal_dir)
1397                 return -ENODEV;
1398         acpi_thermal_dir->owner = THIS_MODULE;
1399
1400         result = acpi_bus_register_driver(&acpi_thermal_driver);
1401         if (result < 0) {
1402                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1403                 return -ENODEV;
1404         }
1405
1406         return 0;
1407 }
1408
1409 static void __exit acpi_thermal_exit(void)
1410 {
1411
1412         acpi_bus_unregister_driver(&acpi_thermal_driver);
1413
1414         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1415
1416         return;
1417 }
1418
1419 module_init(acpi_thermal_init);
1420 module_exit(acpi_thermal_exit);