1b9754919f726d6fa0deccf2ae77ace0e2fa5004
[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         ACPI_FUNCTION_TRACE("acpi_thermal_get_temperature");
226
227         if (!tz)
228                 return_VALUE(-EINVAL);
229
230         tz->last_temperature = tz->temperature;
231
232         status =
233             acpi_evaluate_integer(tz->handle, "_TMP", NULL, &tz->temperature);
234         if (ACPI_FAILURE(status))
235                 return_VALUE(-ENODEV);
236
237         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
238                           tz->temperature));
239
240         return_VALUE(0);
241 }
242
243 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
244 {
245         acpi_status status = AE_OK;
246
247         ACPI_FUNCTION_TRACE("acpi_thermal_get_polling_frequency");
248
249         if (!tz)
250                 return_VALUE(-EINVAL);
251
252         status =
253             acpi_evaluate_integer(tz->handle, "_TZP", NULL,
254                                   &tz->polling_frequency);
255         if (ACPI_FAILURE(status))
256                 return_VALUE(-ENODEV);
257
258         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
259                           tz->polling_frequency));
260
261         return_VALUE(0);
262 }
263
264 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
265 {
266         ACPI_FUNCTION_TRACE("acpi_thermal_set_polling");
267
268         if (!tz)
269                 return_VALUE(-EINVAL);
270
271         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
272
273         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
274                           "Polling frequency set to %lu seconds\n",
275                           tz->polling_frequency));
276
277         return_VALUE(0);
278 }
279
280 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
281 {
282         acpi_status status = AE_OK;
283         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
284         struct acpi_object_list arg_list = { 1, &arg0 };
285         acpi_handle handle = NULL;
286
287         ACPI_FUNCTION_TRACE("acpi_thermal_set_cooling_mode");
288
289         if (!tz)
290                 return_VALUE(-EINVAL);
291
292         status = acpi_get_handle(tz->handle, "_SCP", &handle);
293         if (ACPI_FAILURE(status)) {
294                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
295                 return_VALUE(-ENODEV);
296         }
297
298         arg0.integer.value = mode;
299
300         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
301         if (ACPI_FAILURE(status))
302                 return_VALUE(-ENODEV);
303
304         tz->cooling_mode = mode;
305
306         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
307                           mode ? "passive" : "active"));
308
309         return_VALUE(0);
310 }
311
312 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
313 {
314         acpi_status status = AE_OK;
315         int i = 0;
316
317         ACPI_FUNCTION_TRACE("acpi_thermal_get_trip_points");
318
319         if (!tz)
320                 return_VALUE(-EINVAL);
321
322         /* Critical Shutdown (required) */
323
324         status = acpi_evaluate_integer(tz->handle, "_CRT", NULL,
325                                        &tz->trips.critical.temperature);
326         if (ACPI_FAILURE(status)) {
327                 tz->trips.critical.flags.valid = 0;
328                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
329                 return_VALUE(-ENODEV);
330         } else {
331                 tz->trips.critical.flags.valid = 1;
332                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
333                                   "Found critical threshold [%lu]\n",
334                                   tz->trips.critical.temperature));
335         }
336
337         /* Critical Sleep (optional) */
338
339         status =
340             acpi_evaluate_integer(tz->handle, "_HOT", NULL,
341                                   &tz->trips.hot.temperature);
342         if (ACPI_FAILURE(status)) {
343                 tz->trips.hot.flags.valid = 0;
344                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
345         } else {
346                 tz->trips.hot.flags.valid = 1;
347                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
348                                   tz->trips.hot.temperature));
349         }
350
351         /* Passive: Processors (optional) */
352
353         status =
354             acpi_evaluate_integer(tz->handle, "_PSV", NULL,
355                                   &tz->trips.passive.temperature);
356         if (ACPI_FAILURE(status)) {
357                 tz->trips.passive.flags.valid = 0;
358                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
359         } else {
360                 tz->trips.passive.flags.valid = 1;
361
362                 status =
363                     acpi_evaluate_integer(tz->handle, "_TC1", NULL,
364                                           &tz->trips.passive.tc1);
365                 if (ACPI_FAILURE(status))
366                         tz->trips.passive.flags.valid = 0;
367
368                 status =
369                     acpi_evaluate_integer(tz->handle, "_TC2", NULL,
370                                           &tz->trips.passive.tc2);
371                 if (ACPI_FAILURE(status))
372                         tz->trips.passive.flags.valid = 0;
373
374                 status =
375                     acpi_evaluate_integer(tz->handle, "_TSP", NULL,
376                                           &tz->trips.passive.tsp);
377                 if (ACPI_FAILURE(status))
378                         tz->trips.passive.flags.valid = 0;
379
380                 status =
381                     acpi_evaluate_reference(tz->handle, "_PSL", NULL,
382                                             &tz->trips.passive.devices);
383                 if (ACPI_FAILURE(status))
384                         tz->trips.passive.flags.valid = 0;
385
386                 if (!tz->trips.passive.flags.valid)
387                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
388                 else
389                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
390                                           "Found passive threshold [%lu]\n",
391                                           tz->trips.passive.temperature));
392         }
393
394         /* Active: Fans, etc. (optional) */
395
396         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
397
398                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
399
400                 status =
401                     acpi_evaluate_integer(tz->handle, name, NULL,
402                                           &tz->trips.active[i].temperature);
403                 if (ACPI_FAILURE(status))
404                         break;
405
406                 name[2] = 'L';
407                 status =
408                     acpi_evaluate_reference(tz->handle, name, NULL,
409                                             &tz->trips.active[i].devices);
410                 if (ACPI_SUCCESS(status)) {
411                         tz->trips.active[i].flags.valid = 1;
412                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
413                                           "Found active threshold [%d]:[%lu]\n",
414                                           i, tz->trips.active[i].temperature));
415                 } else
416                         ACPI_EXCEPTION((AE_INFO, status,
417                                         "Invalid active threshold [%d]", i));
418         }
419
420         return_VALUE(0);
421 }
422
423 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
424 {
425         acpi_status status = AE_OK;
426
427         ACPI_FUNCTION_TRACE("acpi_thermal_get_devices");
428
429         if (!tz)
430                 return_VALUE(-EINVAL);
431
432         status =
433             acpi_evaluate_reference(tz->handle, "_TZD", NULL, &tz->devices);
434         if (ACPI_FAILURE(status))
435                 return_VALUE(-ENODEV);
436
437         return_VALUE(0);
438 }
439
440 static int acpi_thermal_call_usermode(char *path)
441 {
442         char *argv[2] = { NULL, NULL };
443         char *envp[3] = { NULL, NULL, NULL };
444
445         ACPI_FUNCTION_TRACE("acpi_thermal_call_usermode");
446
447         if (!path)
448                 return_VALUE(-EINVAL);
449
450         argv[0] = path;
451
452         /* minimal command environment */
453         envp[0] = "HOME=/";
454         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
455
456         call_usermodehelper(argv[0], argv, envp, 0);
457
458         return_VALUE(0);
459 }
460
461 static int acpi_thermal_critical(struct acpi_thermal *tz)
462 {
463         int result = 0;
464         struct acpi_device *device = NULL;
465
466         ACPI_FUNCTION_TRACE("acpi_thermal_critical");
467
468         if (!tz || !tz->trips.critical.flags.valid)
469                 return_VALUE(-EINVAL);
470
471         if (tz->temperature >= tz->trips.critical.temperature) {
472                 printk(KERN_WARNING PREFIX "Critical trip point\n");
473                 tz->trips.critical.flags.enabled = 1;
474         } else if (tz->trips.critical.flags.enabled)
475                 tz->trips.critical.flags.enabled = 0;
476
477         result = acpi_bus_get_device(tz->handle, &device);
478         if (result)
479                 return_VALUE(result);
480
481         printk(KERN_EMERG
482                "Critical temperature reached (%ld C), shutting down.\n",
483                KELVIN_TO_CELSIUS(tz->temperature));
484         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL,
485                                 tz->trips.critical.flags.enabled);
486
487         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
488
489         return_VALUE(0);
490 }
491
492 static int acpi_thermal_hot(struct acpi_thermal *tz)
493 {
494         int result = 0;
495         struct acpi_device *device = NULL;
496
497         ACPI_FUNCTION_TRACE("acpi_thermal_hot");
498
499         if (!tz || !tz->trips.hot.flags.valid)
500                 return_VALUE(-EINVAL);
501
502         if (tz->temperature >= tz->trips.hot.temperature) {
503                 printk(KERN_WARNING PREFIX "Hot trip point\n");
504                 tz->trips.hot.flags.enabled = 1;
505         } else if (tz->trips.hot.flags.enabled)
506                 tz->trips.hot.flags.enabled = 0;
507
508         result = acpi_bus_get_device(tz->handle, &device);
509         if (result)
510                 return_VALUE(result);
511
512         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT,
513                                 tz->trips.hot.flags.enabled);
514
515         /* TBD: Call user-mode "sleep(S4)" function */
516
517         return_VALUE(0);
518 }
519
520 static void acpi_thermal_passive(struct acpi_thermal *tz)
521 {
522         int result = 1;
523         struct acpi_thermal_passive *passive = NULL;
524         int trend = 0;
525         int i = 0;
526
527         ACPI_FUNCTION_TRACE("acpi_thermal_passive");
528
529         if (!tz || !tz->trips.passive.flags.valid)
530                 return;
531
532         passive = &(tz->trips.passive);
533
534         /*
535          * Above Trip?
536          * -----------
537          * Calculate the thermal trend (using the passive cooling equation)
538          * and modify the performance limit for all passive cooling devices
539          * accordingly.  Note that we assume symmetry.
540          */
541         if (tz->temperature >= passive->temperature) {
542                 trend =
543                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
544                     (passive->tc2 * (tz->temperature - passive->temperature));
545                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
546                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
547                                   trend, passive->tc1, tz->temperature,
548                                   tz->last_temperature, passive->tc2,
549                                   tz->temperature, passive->temperature));
550                 passive->flags.enabled = 1;
551                 /* Heating up? */
552                 if (trend > 0)
553                         for (i = 0; i < passive->devices.count; i++)
554                                 acpi_processor_set_thermal_limit(passive->
555                                                                  devices.
556                                                                  handles[i],
557                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
558                 /* Cooling off? */
559                 else if (trend < 0) {
560                         for (i = 0; i < passive->devices.count; i++)
561                                 /*
562                                  * assume that we are on highest
563                                  * freq/lowest thrott and can leave
564                                  * passive mode, even in error case
565                                  */
566                                 if (!acpi_processor_set_thermal_limit
567                                     (passive->devices.handles[i],
568                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
569                                         result = 0;
570                         /*
571                          * Leave cooling mode, even if the temp might
572                          * higher than trip point This is because some
573                          * machines might have long thermal polling
574                          * frequencies (tsp) defined. We will fall back
575                          * into passive mode in next cycle (probably quicker)
576                          */
577                         if (result) {
578                                 passive->flags.enabled = 0;
579                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
580                                                   "Disabling passive cooling, still above threshold,"
581                                                   " but we are cooling down\n"));
582                         }
583                 }
584                 return;
585         }
586
587         /*
588          * Below Trip?
589          * -----------
590          * Implement passive cooling hysteresis to slowly increase performance
591          * and avoid thrashing around the passive trip point.  Note that we
592          * assume symmetry.
593          */
594         if (!passive->flags.enabled)
595                 return;
596         for (i = 0; i < passive->devices.count; i++)
597                 if (!acpi_processor_set_thermal_limit
598                     (passive->devices.handles[i],
599                      ACPI_PROCESSOR_LIMIT_DECREMENT))
600                         result = 0;
601         if (result) {
602                 passive->flags.enabled = 0;
603                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
604                                   "Disabling passive cooling (zone is cool)\n"));
605         }
606 }
607
608 static void acpi_thermal_active(struct acpi_thermal *tz)
609 {
610         int result = 0;
611         struct acpi_thermal_active *active = NULL;
612         int i = 0;
613         int j = 0;
614         unsigned long maxtemp = 0;
615
616         ACPI_FUNCTION_TRACE("acpi_thermal_active");
617
618         if (!tz)
619                 return;
620
621         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
622                 active = &(tz->trips.active[i]);
623                 if (!active || !active->flags.valid)
624                         break;
625                 if (tz->temperature >= active->temperature) {
626                         /*
627                          * Above Threshold?
628                          * ----------------
629                          * If not already enabled, turn ON all cooling devices
630                          * associated with this active threshold.
631                          */
632                         if (active->temperature > maxtemp)
633                                 tz->state.active_index = i;
634                         maxtemp = active->temperature;
635                         if (active->flags.enabled)
636                                 continue;
637                         for (j = 0; j < active->devices.count; j++) {
638                                 result =
639                                     acpi_bus_set_power(active->devices.
640                                                        handles[j],
641                                                        ACPI_STATE_D0);
642                                 if (result) {
643                                         printk(KERN_WARNING PREFIX
644                                                       "Unable to turn cooling device [%p] 'on'\n",
645                                                       active->devices.
646                                                       handles[j]);
647                                         continue;
648                                 }
649                                 active->flags.enabled = 1;
650                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
651                                                   "Cooling device [%p] now 'on'\n",
652                                                   active->devices.handles[j]));
653                         }
654                         continue;
655                 }
656                 if (!active->flags.enabled)
657                         continue;
658                 /*
659                  * Below Threshold?
660                  * ----------------
661                  * Turn OFF all cooling devices associated with this
662                  * threshold.
663                  */
664                 for (j = 0; j < active->devices.count; j++) {
665                         result = acpi_bus_set_power(active->devices.handles[j],
666                                                     ACPI_STATE_D3);
667                         if (result) {
668                                 printk(KERN_WARNING PREFIX
669                                               "Unable to turn cooling device [%p] 'off'\n",
670                                               active->devices.handles[j]);
671                                 continue;
672                         }
673                         active->flags.enabled = 0;
674                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
675                                           "Cooling device [%p] now 'off'\n",
676                                           active->devices.handles[j]));
677                 }
678         }
679 }
680
681 static void acpi_thermal_check(void *context);
682
683 static void acpi_thermal_run(unsigned long data)
684 {
685         struct acpi_thermal *tz = (struct acpi_thermal *)data;
686         if (!tz->zombie)
687                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
688 }
689
690 static void acpi_thermal_check(void *data)
691 {
692         int result = 0;
693         struct acpi_thermal *tz = (struct acpi_thermal *)data;
694         unsigned long sleep_time = 0;
695         int i = 0;
696         struct acpi_thermal_state state;
697
698         ACPI_FUNCTION_TRACE("acpi_thermal_check");
699
700         if (!tz) {
701                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
702                 return_VOID;
703         }
704
705         state = tz->state;
706
707         result = acpi_thermal_get_temperature(tz);
708         if (result)
709                 return_VOID;
710
711         memset(&tz->state, 0, sizeof(tz->state));
712
713         /*
714          * Check Trip Points
715          * -----------------
716          * Compare the current temperature to the trip point values to see
717          * if we've entered one of the thermal policy states.  Note that
718          * this function determines when a state is entered, but the 
719          * individual policy decides when it is exited (e.g. hysteresis).
720          */
721         if (tz->trips.critical.flags.valid)
722                 state.critical |=
723                     (tz->temperature >= tz->trips.critical.temperature);
724         if (tz->trips.hot.flags.valid)
725                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
726         if (tz->trips.passive.flags.valid)
727                 state.passive |=
728                     (tz->temperature >= tz->trips.passive.temperature);
729         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
730                 if (tz->trips.active[i].flags.valid)
731                         state.active |=
732                             (tz->temperature >=
733                              tz->trips.active[i].temperature);
734
735         /*
736          * Invoke Policy
737          * -------------
738          * Separated from the above check to allow individual policy to 
739          * determine when to exit a given state.
740          */
741         if (state.critical)
742                 acpi_thermal_critical(tz);
743         if (state.hot)
744                 acpi_thermal_hot(tz);
745         if (state.passive)
746                 acpi_thermal_passive(tz);
747         if (state.active)
748                 acpi_thermal_active(tz);
749
750         /*
751          * Calculate State
752          * ---------------
753          * Again, separated from the above two to allow independent policy
754          * decisions.
755          */
756         tz->state.critical = tz->trips.critical.flags.enabled;
757         tz->state.hot = tz->trips.hot.flags.enabled;
758         tz->state.passive = tz->trips.passive.flags.enabled;
759         tz->state.active = 0;
760         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
761                 tz->state.active |= tz->trips.active[i].flags.enabled;
762
763         /*
764          * Calculate Sleep Time
765          * --------------------
766          * If we're in the passive state, use _TSP's value.  Otherwise
767          * use the default polling frequency (e.g. _TZP).  If no polling
768          * frequency is specified then we'll wait forever (at least until
769          * a thermal event occurs).  Note that _TSP and _TZD values are
770          * given in 1/10th seconds (we must covert to milliseconds).
771          */
772         if (tz->state.passive)
773                 sleep_time = tz->trips.passive.tsp * 100;
774         else if (tz->polling_frequency > 0)
775                 sleep_time = tz->polling_frequency * 100;
776
777         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
778                           tz->name, tz->temperature, sleep_time));
779
780         /*
781          * Schedule Next Poll
782          * ------------------
783          */
784         if (!sleep_time) {
785                 if (timer_pending(&(tz->timer)))
786                         del_timer(&(tz->timer));
787         } else {
788                 if (timer_pending(&(tz->timer)))
789                         mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
790                 else {
791                         tz->timer.data = (unsigned long)tz;
792                         tz->timer.function = acpi_thermal_run;
793                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
794                         add_timer(&(tz->timer));
795                 }
796         }
797
798         return_VOID;
799 }
800
801 /* --------------------------------------------------------------------------
802                               FS Interface (/proc)
803    -------------------------------------------------------------------------- */
804
805 static struct proc_dir_entry *acpi_thermal_dir;
806
807 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
808 {
809         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
810
811         ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show");
812
813         if (!tz)
814                 goto end;
815
816         seq_puts(seq, "state:                   ");
817
818         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
819             && !tz->state.active)
820                 seq_puts(seq, "ok\n");
821         else {
822                 if (tz->state.critical)
823                         seq_puts(seq, "critical ");
824                 if (tz->state.hot)
825                         seq_puts(seq, "hot ");
826                 if (tz->state.passive)
827                         seq_puts(seq, "passive ");
828                 if (tz->state.active)
829                         seq_printf(seq, "active[%d]", tz->state.active_index);
830                 seq_puts(seq, "\n");
831         }
832
833       end:
834         return_VALUE(0);
835 }
836
837 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
838 {
839         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
840 }
841
842 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
843 {
844         int result = 0;
845         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
846
847         ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show");
848
849         if (!tz)
850                 goto end;
851
852         result = acpi_thermal_get_temperature(tz);
853         if (result)
854                 goto end;
855
856         seq_printf(seq, "temperature:             %ld C\n",
857                    KELVIN_TO_CELSIUS(tz->temperature));
858
859       end:
860         return_VALUE(0);
861 }
862
863 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
864 {
865         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
866 }
867
868 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
869 {
870         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
871         int i = 0;
872         int j = 0;
873
874         ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show");
875
876         if (!tz)
877                 goto end;
878
879         if (tz->trips.critical.flags.valid)
880                 seq_printf(seq, "critical (S5):           %ld C\n",
881                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
882
883         if (tz->trips.hot.flags.valid)
884                 seq_printf(seq, "hot (S4):                %ld C\n",
885                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
886
887         if (tz->trips.passive.flags.valid) {
888                 seq_printf(seq,
889                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
890                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
891                            tz->trips.passive.tc1, tz->trips.passive.tc2,
892                            tz->trips.passive.tsp);
893                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
894
895                         seq_printf(seq, "0x%p ",
896                                    tz->trips.passive.devices.handles[j]);
897                 }
898                 seq_puts(seq, "\n");
899         }
900
901         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
902                 if (!(tz->trips.active[i].flags.valid))
903                         break;
904                 seq_printf(seq, "active[%d]:               %ld C: devices=",
905                            i,
906                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
907                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
908                         seq_printf(seq, "0x%p ",
909                                    tz->trips.active[i].devices.handles[j]);
910                 seq_puts(seq, "\n");
911         }
912
913       end:
914         return_VALUE(0);
915 }
916
917 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
918 {
919         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
920 }
921
922 static ssize_t
923 acpi_thermal_write_trip_points(struct file *file,
924                                const char __user * buffer,
925                                size_t count, loff_t * ppos)
926 {
927         struct seq_file *m = (struct seq_file *)file->private_data;
928         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
929
930         char *limit_string;
931         int num, critical, hot, passive;
932         int *active;
933         int i = 0;
934
935         ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points");
936
937         limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
938         if (!limit_string)
939                 return_VALUE(-ENOMEM);
940
941         memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN);
942
943         active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
944         if (!active) {
945                 kfree(limit_string);
946                 return_VALUE(-ENOMEM);
947         }
948
949         if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
950                 count = -EINVAL;
951                 goto end;
952         }
953
954         if (copy_from_user(limit_string, buffer, count)) {
955                 count = -EFAULT;
956                 goto end;
957         }
958
959         limit_string[count] = '\0';
960
961         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
962                      &critical, &hot, &passive,
963                      &active[0], &active[1], &active[2], &active[3], &active[4],
964                      &active[5], &active[6], &active[7], &active[8],
965                      &active[9]);
966         if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
967                 count = -EINVAL;
968                 goto end;
969         }
970
971         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
972         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
973         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
974         for (i = 0; i < num - 3; i++) {
975                 if (!(tz->trips.active[i].flags.valid))
976                         break;
977                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
978         }
979
980       end:
981         kfree(active);
982         kfree(limit_string);
983         return_VALUE(count);
984 }
985
986 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
987 {
988         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
989
990         ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show");
991
992         if (!tz)
993                 goto end;
994
995         if (!tz->flags.cooling_mode) {
996                 seq_puts(seq, "<setting not supported>\n");
997         }
998
999         if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
1000                 seq_printf(seq, "cooling mode:  critical\n");
1001         else
1002                 seq_printf(seq, "cooling mode:  %s\n",
1003                            tz->cooling_mode ? "passive" : "active");
1004
1005       end:
1006         return_VALUE(0);
1007 }
1008
1009 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1010 {
1011         return single_open(file, acpi_thermal_cooling_seq_show,
1012                            PDE(inode)->data);
1013 }
1014
1015 static ssize_t
1016 acpi_thermal_write_cooling_mode(struct file *file,
1017                                 const char __user * buffer,
1018                                 size_t count, loff_t * ppos)
1019 {
1020         struct seq_file *m = (struct seq_file *)file->private_data;
1021         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1022         int result = 0;
1023         char mode_string[12] = { '\0' };
1024
1025         ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode");
1026
1027         if (!tz || (count > sizeof(mode_string) - 1))
1028                 return_VALUE(-EINVAL);
1029
1030         if (!tz->flags.cooling_mode)
1031                 return_VALUE(-ENODEV);
1032
1033         if (copy_from_user(mode_string, buffer, count))
1034                 return_VALUE(-EFAULT);
1035
1036         mode_string[count] = '\0';
1037
1038         result = acpi_thermal_set_cooling_mode(tz,
1039                                                simple_strtoul(mode_string, NULL,
1040                                                               0));
1041         if (result)
1042                 return_VALUE(result);
1043
1044         acpi_thermal_check(tz);
1045
1046         return_VALUE(count);
1047 }
1048
1049 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1050 {
1051         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
1052
1053         ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show");
1054
1055         if (!tz)
1056                 goto end;
1057
1058         if (!tz->polling_frequency) {
1059                 seq_puts(seq, "<polling disabled>\n");
1060                 goto end;
1061         }
1062
1063         seq_printf(seq, "polling frequency:       %lu seconds\n",
1064                    (tz->polling_frequency / 10));
1065
1066       end:
1067         return_VALUE(0);
1068 }
1069
1070 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1071 {
1072         return single_open(file, acpi_thermal_polling_seq_show,
1073                            PDE(inode)->data);
1074 }
1075
1076 static ssize_t
1077 acpi_thermal_write_polling(struct file *file,
1078                            const char __user * buffer,
1079                            size_t count, loff_t * ppos)
1080 {
1081         struct seq_file *m = (struct seq_file *)file->private_data;
1082         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1083         int result = 0;
1084         char polling_string[12] = { '\0' };
1085         int seconds = 0;
1086
1087         ACPI_FUNCTION_TRACE("acpi_thermal_write_polling");
1088
1089         if (!tz || (count > sizeof(polling_string) - 1))
1090                 return_VALUE(-EINVAL);
1091
1092         if (copy_from_user(polling_string, buffer, count))
1093                 return_VALUE(-EFAULT);
1094
1095         polling_string[count] = '\0';
1096
1097         seconds = simple_strtoul(polling_string, NULL, 0);
1098
1099         result = acpi_thermal_set_polling(tz, seconds);
1100         if (result)
1101                 return_VALUE(result);
1102
1103         acpi_thermal_check(tz);
1104
1105         return_VALUE(count);
1106 }
1107
1108 static int acpi_thermal_add_fs(struct acpi_device *device)
1109 {
1110         struct proc_dir_entry *entry = NULL;
1111
1112         ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
1113
1114         if (!acpi_device_dir(device)) {
1115                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1116                                                      acpi_thermal_dir);
1117                 if (!acpi_device_dir(device))
1118                         return_VALUE(-ENODEV);
1119                 acpi_device_dir(device)->owner = THIS_MODULE;
1120         }
1121
1122         /* 'state' [R] */
1123         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1124                                   S_IRUGO, acpi_device_dir(device));
1125         if (!entry)
1126                 return_VALUE(-ENODEV);
1127         else {
1128                 entry->proc_fops = &acpi_thermal_state_fops;
1129                 entry->data = acpi_driver_data(device);
1130                 entry->owner = THIS_MODULE;
1131         }
1132
1133         /* 'temperature' [R] */
1134         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1135                                   S_IRUGO, acpi_device_dir(device));
1136         if (!entry)
1137                 return_VALUE(-ENODEV);
1138         else {
1139                 entry->proc_fops = &acpi_thermal_temp_fops;
1140                 entry->data = acpi_driver_data(device);
1141                 entry->owner = THIS_MODULE;
1142         }
1143
1144         /* 'trip_points' [R/W] */
1145         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1146                                   S_IFREG | S_IRUGO | S_IWUSR,
1147                                   acpi_device_dir(device));
1148         if (!entry)
1149                 return_VALUE(-ENODEV);
1150         else {
1151                 entry->proc_fops = &acpi_thermal_trip_fops;
1152                 entry->data = acpi_driver_data(device);
1153                 entry->owner = THIS_MODULE;
1154         }
1155
1156         /* 'cooling_mode' [R/W] */
1157         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1158                                   S_IFREG | S_IRUGO | S_IWUSR,
1159                                   acpi_device_dir(device));
1160         if (!entry)
1161                 return_VALUE(-ENODEV);
1162         else {
1163                 entry->proc_fops = &acpi_thermal_cooling_fops;
1164                 entry->data = acpi_driver_data(device);
1165                 entry->owner = THIS_MODULE;
1166         }
1167
1168         /* 'polling_frequency' [R/W] */
1169         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1170                                   S_IFREG | S_IRUGO | S_IWUSR,
1171                                   acpi_device_dir(device));
1172         if (!entry)
1173                 return_VALUE(-ENODEV);
1174         else {
1175                 entry->proc_fops = &acpi_thermal_polling_fops;
1176                 entry->data = acpi_driver_data(device);
1177                 entry->owner = THIS_MODULE;
1178         }
1179
1180         return_VALUE(0);
1181 }
1182
1183 static int acpi_thermal_remove_fs(struct acpi_device *device)
1184 {
1185         ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
1186
1187         if (acpi_device_dir(device)) {
1188                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1189                                   acpi_device_dir(device));
1190                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1191                                   acpi_device_dir(device));
1192                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1193                                   acpi_device_dir(device));
1194                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1195                                   acpi_device_dir(device));
1196                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1197                                   acpi_device_dir(device));
1198                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1199                 acpi_device_dir(device) = NULL;
1200         }
1201
1202         return_VALUE(0);
1203 }
1204
1205 /* --------------------------------------------------------------------------
1206                                  Driver Interface
1207    -------------------------------------------------------------------------- */
1208
1209 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1210 {
1211         struct acpi_thermal *tz = (struct acpi_thermal *)data;
1212         struct acpi_device *device = NULL;
1213
1214         ACPI_FUNCTION_TRACE("acpi_thermal_notify");
1215
1216         if (!tz)
1217                 return_VOID;
1218
1219         if (acpi_bus_get_device(tz->handle, &device))
1220                 return_VOID;
1221
1222         switch (event) {
1223         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1224                 acpi_thermal_check(tz);
1225                 break;
1226         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1227                 acpi_thermal_get_trip_points(tz);
1228                 acpi_thermal_check(tz);
1229                 acpi_bus_generate_event(device, event, 0);
1230                 break;
1231         case ACPI_THERMAL_NOTIFY_DEVICES:
1232                 if (tz->flags.devices)
1233                         acpi_thermal_get_devices(tz);
1234                 acpi_bus_generate_event(device, event, 0);
1235                 break;
1236         default:
1237                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1238                                   "Unsupported event [0x%x]\n", event));
1239                 break;
1240         }
1241
1242         return_VOID;
1243 }
1244
1245 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1246 {
1247         int result = 0;
1248
1249         ACPI_FUNCTION_TRACE("acpi_thermal_get_info");
1250
1251         if (!tz)
1252                 return_VALUE(-EINVAL);
1253
1254         /* Get temperature [_TMP] (required) */
1255         result = acpi_thermal_get_temperature(tz);
1256         if (result)
1257                 return_VALUE(result);
1258
1259         /* Get trip points [_CRT, _PSV, etc.] (required) */
1260         result = acpi_thermal_get_trip_points(tz);
1261         if (result)
1262                 return_VALUE(result);
1263
1264         /* Set the cooling mode [_SCP] to active cooling (default) */
1265         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1266         if (!result)
1267                 tz->flags.cooling_mode = 1;
1268         else {
1269                 /* Oh,we have not _SCP method.
1270                    Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1271                 tz->flags.cooling_mode = 0;
1272                 if (tz->trips.active[0].flags.valid
1273                     && tz->trips.passive.flags.valid) {
1274                         if (tz->trips.passive.temperature >
1275                             tz->trips.active[0].temperature)
1276                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1277                         else
1278                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1279                 } else if (!tz->trips.active[0].flags.valid
1280                            && tz->trips.passive.flags.valid) {
1281                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1282                 } else if (tz->trips.active[0].flags.valid
1283                            && !tz->trips.passive.flags.valid) {
1284                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1285                 } else {
1286                         /* _ACx and _PSV are optional, but _CRT is required */
1287                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1288                 }
1289         }
1290
1291         /* Get default polling frequency [_TZP] (optional) */
1292         if (tzp)
1293                 tz->polling_frequency = tzp;
1294         else
1295                 acpi_thermal_get_polling_frequency(tz);
1296
1297         /* Get devices in this thermal zone [_TZD] (optional) */
1298         result = acpi_thermal_get_devices(tz);
1299         if (!result)
1300                 tz->flags.devices = 1;
1301
1302         return_VALUE(0);
1303 }
1304
1305 static int acpi_thermal_add(struct acpi_device *device)
1306 {
1307         int result = 0;
1308         acpi_status status = AE_OK;
1309         struct acpi_thermal *tz = NULL;
1310
1311         ACPI_FUNCTION_TRACE("acpi_thermal_add");
1312
1313         if (!device)
1314                 return_VALUE(-EINVAL);
1315
1316         tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1317         if (!tz)
1318                 return_VALUE(-ENOMEM);
1319         memset(tz, 0, sizeof(struct acpi_thermal));
1320
1321         tz->handle = device->handle;
1322         strcpy(tz->name, device->pnp.bus_id);
1323         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1324         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1325         acpi_driver_data(device) = tz;
1326
1327         result = acpi_thermal_get_info(tz);
1328         if (result)
1329                 goto end;
1330
1331         result = acpi_thermal_add_fs(device);
1332         if (result)
1333                 goto end;
1334
1335         init_timer(&tz->timer);
1336
1337         acpi_thermal_check(tz);
1338
1339         status = acpi_install_notify_handler(tz->handle,
1340                                              ACPI_DEVICE_NOTIFY,
1341                                              acpi_thermal_notify, tz);
1342         if (ACPI_FAILURE(status)) {
1343                 result = -ENODEV;
1344                 goto end;
1345         }
1346
1347         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1348                acpi_device_name(device), acpi_device_bid(device),
1349                KELVIN_TO_CELSIUS(tz->temperature));
1350
1351       end:
1352         if (result) {
1353                 acpi_thermal_remove_fs(device);
1354                 kfree(tz);
1355         }
1356
1357         return_VALUE(result);
1358 }
1359
1360 static int acpi_thermal_remove(struct acpi_device *device, int type)
1361 {
1362         acpi_status status = AE_OK;
1363         struct acpi_thermal *tz = NULL;
1364
1365         ACPI_FUNCTION_TRACE("acpi_thermal_remove");
1366
1367         if (!device || !acpi_driver_data(device))
1368                 return_VALUE(-EINVAL);
1369
1370         tz = (struct acpi_thermal *)acpi_driver_data(device);
1371
1372         /* avoid timer adding new defer task */
1373         tz->zombie = 1;
1374         /* wait for running timer (on other CPUs) finish */
1375         del_timer_sync(&(tz->timer));
1376         /* synchronize deferred task */
1377         acpi_os_wait_events_complete(NULL);
1378         /* deferred task may reinsert timer */
1379         del_timer_sync(&(tz->timer));
1380
1381         status = acpi_remove_notify_handler(tz->handle,
1382                                             ACPI_DEVICE_NOTIFY,
1383                                             acpi_thermal_notify);
1384
1385         /* Terminate policy */
1386         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1387                 tz->trips.passive.flags.enabled = 0;
1388                 acpi_thermal_passive(tz);
1389         }
1390         if (tz->trips.active[0].flags.valid
1391             && tz->trips.active[0].flags.enabled) {
1392                 tz->trips.active[0].flags.enabled = 0;
1393                 acpi_thermal_active(tz);
1394         }
1395
1396         acpi_thermal_remove_fs(device);
1397
1398         kfree(tz);
1399         return_VALUE(0);
1400 }
1401
1402 static int acpi_thermal_resume(struct acpi_device *device, int state)
1403 {
1404         struct acpi_thermal *tz = NULL;
1405
1406         if (!device || !acpi_driver_data(device))
1407                 return_VALUE(-EINVAL);
1408
1409         tz = (struct acpi_thermal *)acpi_driver_data(device);
1410
1411         acpi_thermal_check(tz);
1412
1413         return AE_OK;
1414 }
1415
1416 static int __init acpi_thermal_init(void)
1417 {
1418         int result = 0;
1419
1420         ACPI_FUNCTION_TRACE("acpi_thermal_init");
1421
1422         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1423         if (!acpi_thermal_dir)
1424                 return_VALUE(-ENODEV);
1425         acpi_thermal_dir->owner = THIS_MODULE;
1426
1427         result = acpi_bus_register_driver(&acpi_thermal_driver);
1428         if (result < 0) {
1429                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1430                 return_VALUE(-ENODEV);
1431         }
1432
1433         return_VALUE(0);
1434 }
1435
1436 static void __exit acpi_thermal_exit(void)
1437 {
1438         ACPI_FUNCTION_TRACE("acpi_thermal_exit");
1439
1440         acpi_bus_unregister_driver(&acpi_thermal_driver);
1441
1442         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1443
1444         return_VOID;
1445 }
1446
1447 module_init(acpi_thermal_init);
1448 module_exit(acpi_thermal_exit);