Pull events into release branch
[sfrench/cifs-2.6.git] / drivers / acpi / thermal.c
1 /*
2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
3  *
4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or (at
12  *  your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful, but
15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  *  General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License along
20  *  with this program; if not, write to the Free Software Foundation, Inc.,
21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  *
25  *  This driver fully implements the ACPI thermal policy as described in the
26  *  ACPI 2.0 Specification.
27  *
28  *  TBD: 1. Implement passive cooling hysteresis.
29  *       2. Enhance passive cooling (CPU) states/limit interface to support
30  *          concepts of 'multiple limiters', upper/lower limits, etc.
31  *
32  */
33
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/dmi.h>
37 #include <linux/init.h>
38 #include <linux/types.h>
39 #include <linux/proc_fs.h>
40 #include <linux/timer.h>
41 #include <linux/jiffies.h>
42 #include <linux/kmod.h>
43 #include <linux/seq_file.h>
44 #include <linux/reboot.h>
45 #include <asm/uaccess.h>
46
47 #include <acpi/acpi_bus.h>
48 #include <acpi/acpi_drivers.h>
49
50 #define ACPI_THERMAL_COMPONENT          0x04000000
51 #define ACPI_THERMAL_CLASS              "thermal_zone"
52 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
53 #define ACPI_THERMAL_FILE_STATE         "state"
54 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
55 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
56 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
57 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
58 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
59 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
60 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
61 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
62 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
63 #define ACPI_THERMAL_MODE_ACTIVE        0x00
64
65 #define ACPI_THERMAL_MAX_ACTIVE 10
66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
67
68 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
69 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
70
71 #define _COMPONENT              ACPI_THERMAL_COMPONENT
72 ACPI_MODULE_NAME("thermal");
73
74 MODULE_AUTHOR("Paul Diefenbaugh");
75 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
76 MODULE_LICENSE("GPL");
77
78 static int act;
79 module_param(act, int, 0644);
80 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
81
82 static int crt;
83 module_param(crt, int, 0644);
84 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
85
86 static int tzp;
87 module_param(tzp, int, 0444);
88 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
89
90 static int nocrt;
91 module_param(nocrt, int, 0);
92 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
93
94 static int off;
95 module_param(off, int, 0);
96 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
97
98 static int psv;
99 module_param(psv, int, 0644);
100 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
101
102 static int acpi_thermal_add(struct acpi_device *device);
103 static int acpi_thermal_remove(struct acpi_device *device, int type);
104 static int acpi_thermal_resume(struct acpi_device *device);
105 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
106 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
107 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
108 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
109 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
110                                                const char __user *, size_t,
111                                                loff_t *);
112 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
113 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
114                                           size_t, loff_t *);
115
116 static const struct acpi_device_id  thermal_device_ids[] = {
117         {ACPI_THERMAL_HID, 0},
118         {"", 0},
119 };
120 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
121
122 static struct acpi_driver acpi_thermal_driver = {
123         .name = "thermal",
124         .class = ACPI_THERMAL_CLASS,
125         .ids = thermal_device_ids,
126         .ops = {
127                 .add = acpi_thermal_add,
128                 .remove = acpi_thermal_remove,
129                 .resume = acpi_thermal_resume,
130                 },
131 };
132
133 struct acpi_thermal_state {
134         u8 critical:1;
135         u8 hot:1;
136         u8 passive:1;
137         u8 active:1;
138         u8 reserved:4;
139         int active_index;
140 };
141
142 struct acpi_thermal_state_flags {
143         u8 valid:1;
144         u8 enabled:1;
145         u8 reserved:6;
146 };
147
148 struct acpi_thermal_critical {
149         struct acpi_thermal_state_flags flags;
150         unsigned long temperature;
151 };
152
153 struct acpi_thermal_hot {
154         struct acpi_thermal_state_flags flags;
155         unsigned long temperature;
156 };
157
158 struct acpi_thermal_passive {
159         struct acpi_thermal_state_flags flags;
160         unsigned long temperature;
161         unsigned long tc1;
162         unsigned long tc2;
163         unsigned long tsp;
164         struct acpi_handle_list devices;
165 };
166
167 struct acpi_thermal_active {
168         struct acpi_thermal_state_flags flags;
169         unsigned long temperature;
170         struct acpi_handle_list devices;
171 };
172
173 struct acpi_thermal_trips {
174         struct acpi_thermal_critical critical;
175         struct acpi_thermal_hot hot;
176         struct acpi_thermal_passive passive;
177         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
178 };
179
180 struct acpi_thermal_flags {
181         u8 cooling_mode:1;      /* _SCP */
182         u8 devices:1;           /* _TZD */
183         u8 reserved:6;
184 };
185
186 struct acpi_thermal {
187         struct acpi_device * device;
188         acpi_bus_id name;
189         unsigned long temperature;
190         unsigned long last_temperature;
191         unsigned long polling_frequency;
192         volatile u8 zombie;
193         struct acpi_thermal_flags flags;
194         struct acpi_thermal_state state;
195         struct acpi_thermal_trips trips;
196         struct acpi_handle_list devices;
197         struct timer_list timer;
198 };
199
200 static const struct file_operations acpi_thermal_state_fops = {
201         .open = acpi_thermal_state_open_fs,
202         .read = seq_read,
203         .llseek = seq_lseek,
204         .release = single_release,
205 };
206
207 static const struct file_operations acpi_thermal_temp_fops = {
208         .open = acpi_thermal_temp_open_fs,
209         .read = seq_read,
210         .llseek = seq_lseek,
211         .release = single_release,
212 };
213
214 static const struct file_operations acpi_thermal_trip_fops = {
215         .open = acpi_thermal_trip_open_fs,
216         .read = seq_read,
217         .llseek = seq_lseek,
218         .release = single_release,
219 };
220
221 static const struct file_operations acpi_thermal_cooling_fops = {
222         .open = acpi_thermal_cooling_open_fs,
223         .read = seq_read,
224         .write = acpi_thermal_write_cooling_mode,
225         .llseek = seq_lseek,
226         .release = single_release,
227 };
228
229 static const struct file_operations acpi_thermal_polling_fops = {
230         .open = acpi_thermal_polling_open_fs,
231         .read = seq_read,
232         .write = acpi_thermal_write_polling,
233         .llseek = seq_lseek,
234         .release = single_release,
235 };
236
237 /* --------------------------------------------------------------------------
238                              Thermal Zone Management
239    -------------------------------------------------------------------------- */
240
241 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
242 {
243         acpi_status status = AE_OK;
244
245
246         if (!tz)
247                 return -EINVAL;
248
249         tz->last_temperature = tz->temperature;
250
251         status =
252             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
253         if (ACPI_FAILURE(status))
254                 return -ENODEV;
255
256         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
257                           tz->temperature));
258
259         return 0;
260 }
261
262 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
263 {
264         acpi_status status = AE_OK;
265
266
267         if (!tz)
268                 return -EINVAL;
269
270         status =
271             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
272                                   &tz->polling_frequency);
273         if (ACPI_FAILURE(status))
274                 return -ENODEV;
275
276         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
277                           tz->polling_frequency));
278
279         return 0;
280 }
281
282 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
283 {
284
285         if (!tz)
286                 return -EINVAL;
287
288         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
289
290         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
291                           "Polling frequency set to %lu seconds\n",
292                           tz->polling_frequency/10));
293
294         return 0;
295 }
296
297 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
298 {
299         acpi_status status = AE_OK;
300         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
301         struct acpi_object_list arg_list = { 1, &arg0 };
302         acpi_handle handle = NULL;
303
304
305         if (!tz)
306                 return -EINVAL;
307
308         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
309         if (ACPI_FAILURE(status)) {
310                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
311                 return -ENODEV;
312         }
313
314         arg0.integer.value = mode;
315
316         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
317         if (ACPI_FAILURE(status))
318                 return -ENODEV;
319
320         return 0;
321 }
322
323 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
324 {
325         acpi_status status = AE_OK;
326         int i = 0;
327
328
329         if (!tz)
330                 return -EINVAL;
331
332         /* Critical Shutdown (required) */
333
334         status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
335                                        &tz->trips.critical.temperature);
336         if (ACPI_FAILURE(status)) {
337                 tz->trips.critical.flags.valid = 0;
338                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
339                 return -ENODEV;
340         } else {
341                 tz->trips.critical.flags.valid = 1;
342                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
343                                   "Found critical threshold [%lu]\n",
344                                   tz->trips.critical.temperature));
345         }
346
347         if (tz->trips.critical.flags.valid == 1) {
348                 if (crt == -1) {
349                         tz->trips.critical.flags.valid = 0;
350                 } else if (crt > 0) {
351                         unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
352
353                         /*
354                          * Allow override to lower critical threshold
355                          */
356                         if (crt_k < tz->trips.critical.temperature)
357                                 tz->trips.critical.temperature = crt_k;
358                 }
359         }
360
361         /* Critical Sleep (optional) */
362
363         status =
364             acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
365                                   &tz->trips.hot.temperature);
366         if (ACPI_FAILURE(status)) {
367                 tz->trips.hot.flags.valid = 0;
368                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
369         } else {
370                 tz->trips.hot.flags.valid = 1;
371                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
372                                   tz->trips.hot.temperature));
373         }
374
375         /* Passive: Processors (optional) */
376
377         if (psv == -1) {
378                 status = AE_SUPPORT;
379         } else if (psv > 0) {
380                 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
381                 status = AE_OK;
382         } else {
383                 status = acpi_evaluate_integer(tz->device->handle,
384                         "_PSV", NULL, &tz->trips.passive.temperature);
385         }
386
387         if (ACPI_FAILURE(status)) {
388                 tz->trips.passive.flags.valid = 0;
389                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
390         } else {
391                 tz->trips.passive.flags.valid = 1;
392
393                 status =
394                     acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
395                                           &tz->trips.passive.tc1);
396                 if (ACPI_FAILURE(status))
397                         tz->trips.passive.flags.valid = 0;
398
399                 status =
400                     acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
401                                           &tz->trips.passive.tc2);
402                 if (ACPI_FAILURE(status))
403                         tz->trips.passive.flags.valid = 0;
404
405                 status =
406                     acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
407                                           &tz->trips.passive.tsp);
408                 if (ACPI_FAILURE(status))
409                         tz->trips.passive.flags.valid = 0;
410
411                 status =
412                     acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
413                                             &tz->trips.passive.devices);
414                 if (ACPI_FAILURE(status))
415                         tz->trips.passive.flags.valid = 0;
416
417                 if (!tz->trips.passive.flags.valid)
418                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
419                 else
420                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
421                                           "Found passive threshold [%lu]\n",
422                                           tz->trips.passive.temperature));
423         }
424
425         /* Active: Fans, etc. (optional) */
426
427         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
428
429                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
430
431                 if (act == -1)
432                         break;  /* disable all active trip points */
433
434                 status = acpi_evaluate_integer(tz->device->handle,
435                         name, NULL, &tz->trips.active[i].temperature);
436
437                 if (ACPI_FAILURE(status)) {
438                         if (i == 0)     /* no active trip points */
439                                 break;
440                         if (act <= 0)   /* no override requested */
441                                 break;
442                         if (i == 1) {   /* 1 trip point */
443                                 tz->trips.active[0].temperature =
444                                         CELSIUS_TO_KELVIN(act);
445                         } else {        /* multiple trips */
446                                 /*
447                                  * Don't allow override higher than
448                                  * the next higher trip point
449                                  */
450                                 tz->trips.active[i - 1].temperature =
451                                     (tz->trips.active[i - 2].temperature <
452                                         CELSIUS_TO_KELVIN(act) ?
453                                         tz->trips.active[i - 2].temperature :
454                                         CELSIUS_TO_KELVIN(act));
455                         }
456                         break;
457                 }
458
459                 name[2] = 'L';
460                 status =
461                     acpi_evaluate_reference(tz->device->handle, name, NULL,
462                                             &tz->trips.active[i].devices);
463                 if (ACPI_SUCCESS(status)) {
464                         tz->trips.active[i].flags.valid = 1;
465                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
466                                           "Found active threshold [%d]:[%lu]\n",
467                                           i, tz->trips.active[i].temperature));
468                 } else
469                         ACPI_EXCEPTION((AE_INFO, status,
470                                         "Invalid active threshold [%d]", i));
471         }
472
473         return 0;
474 }
475
476 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
477 {
478         acpi_status status = AE_OK;
479
480
481         if (!tz)
482                 return -EINVAL;
483
484         status =
485             acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
486         if (ACPI_FAILURE(status))
487                 return -ENODEV;
488
489         return 0;
490 }
491
492 static int acpi_thermal_critical(struct acpi_thermal *tz)
493 {
494         if (!tz || !tz->trips.critical.flags.valid || nocrt)
495                 return -EINVAL;
496
497         if (tz->temperature >= tz->trips.critical.temperature) {
498                 printk(KERN_WARNING PREFIX "Critical trip point\n");
499                 tz->trips.critical.flags.enabled = 1;
500         } else if (tz->trips.critical.flags.enabled)
501                 tz->trips.critical.flags.enabled = 0;
502
503         printk(KERN_EMERG
504                "Critical temperature reached (%ld C), shutting down.\n",
505                KELVIN_TO_CELSIUS(tz->temperature));
506         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
507                                 tz->trips.critical.flags.enabled);
508         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
509                                           tz->device->dev.bus_id,
510                                           ACPI_THERMAL_NOTIFY_CRITICAL,
511                                           tz->trips.critical.flags.enabled);
512
513         orderly_poweroff(true);
514
515         return 0;
516 }
517
518 static int acpi_thermal_hot(struct acpi_thermal *tz)
519 {
520         if (!tz || !tz->trips.hot.flags.valid || nocrt)
521                 return -EINVAL;
522
523         if (tz->temperature >= tz->trips.hot.temperature) {
524                 printk(KERN_WARNING PREFIX "Hot trip point\n");
525                 tz->trips.hot.flags.enabled = 1;
526         } else if (tz->trips.hot.flags.enabled)
527                 tz->trips.hot.flags.enabled = 0;
528
529         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
530                                 tz->trips.hot.flags.enabled);
531         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
532                                           tz->device->dev.bus_id,
533                                           ACPI_THERMAL_NOTIFY_HOT,
534                                           tz->trips.hot.flags.enabled);
535
536         /* TBD: Call user-mode "sleep(S4)" function */
537
538         return 0;
539 }
540
541 static void acpi_thermal_passive(struct acpi_thermal *tz)
542 {
543         int result = 1;
544         struct acpi_thermal_passive *passive = NULL;
545         int trend = 0;
546         int i = 0;
547
548
549         if (!tz || !tz->trips.passive.flags.valid)
550                 return;
551
552         passive = &(tz->trips.passive);
553
554         /*
555          * Above Trip?
556          * -----------
557          * Calculate the thermal trend (using the passive cooling equation)
558          * and modify the performance limit for all passive cooling devices
559          * accordingly.  Note that we assume symmetry.
560          */
561         if (tz->temperature >= passive->temperature) {
562                 trend =
563                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
564                     (passive->tc2 * (tz->temperature - passive->temperature));
565                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
566                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
567                                   trend, passive->tc1, tz->temperature,
568                                   tz->last_temperature, passive->tc2,
569                                   tz->temperature, passive->temperature));
570                 passive->flags.enabled = 1;
571                 /* Heating up? */
572                 if (trend > 0)
573                         for (i = 0; i < passive->devices.count; i++)
574                                 acpi_processor_set_thermal_limit(passive->
575                                                                  devices.
576                                                                  handles[i],
577                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
578                 /* Cooling off? */
579                 else if (trend < 0) {
580                         for (i = 0; i < passive->devices.count; i++)
581                                 /*
582                                  * assume that we are on highest
583                                  * freq/lowest thrott and can leave
584                                  * passive mode, even in error case
585                                  */
586                                 if (!acpi_processor_set_thermal_limit
587                                     (passive->devices.handles[i],
588                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
589                                         result = 0;
590                         /*
591                          * Leave cooling mode, even if the temp might
592                          * higher than trip point This is because some
593                          * machines might have long thermal polling
594                          * frequencies (tsp) defined. We will fall back
595                          * into passive mode in next cycle (probably quicker)
596                          */
597                         if (result) {
598                                 passive->flags.enabled = 0;
599                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
600                                                   "Disabling passive cooling, still above threshold,"
601                                                   " but we are cooling down\n"));
602                         }
603                 }
604                 return;
605         }
606
607         /*
608          * Below Trip?
609          * -----------
610          * Implement passive cooling hysteresis to slowly increase performance
611          * and avoid thrashing around the passive trip point.  Note that we
612          * assume symmetry.
613          */
614         if (!passive->flags.enabled)
615                 return;
616         for (i = 0; i < passive->devices.count; i++)
617                 if (!acpi_processor_set_thermal_limit
618                     (passive->devices.handles[i],
619                      ACPI_PROCESSOR_LIMIT_DECREMENT))
620                         result = 0;
621         if (result) {
622                 passive->flags.enabled = 0;
623                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
624                                   "Disabling passive cooling (zone is cool)\n"));
625         }
626 }
627
628 static void acpi_thermal_active(struct acpi_thermal *tz)
629 {
630         int result = 0;
631         struct acpi_thermal_active *active = NULL;
632         int i = 0;
633         int j = 0;
634         unsigned long maxtemp = 0;
635
636
637         if (!tz)
638                 return;
639
640         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
641                 active = &(tz->trips.active[i]);
642                 if (!active || !active->flags.valid)
643                         break;
644                 if (tz->temperature >= active->temperature) {
645                         /*
646                          * Above Threshold?
647                          * ----------------
648                          * If not already enabled, turn ON all cooling devices
649                          * associated with this active threshold.
650                          */
651                         if (active->temperature > maxtemp)
652                                 tz->state.active_index = i;
653                         maxtemp = active->temperature;
654                         if (active->flags.enabled)
655                                 continue;
656                         for (j = 0; j < active->devices.count; j++) {
657                                 result =
658                                     acpi_bus_set_power(active->devices.
659                                                        handles[j],
660                                                        ACPI_STATE_D0);
661                                 if (result) {
662                                         printk(KERN_WARNING PREFIX
663                                                       "Unable to turn cooling device [%p] 'on'\n",
664                                                       active->devices.
665                                                       handles[j]);
666                                         continue;
667                                 }
668                                 active->flags.enabled = 1;
669                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
670                                                   "Cooling device [%p] now 'on'\n",
671                                                   active->devices.handles[j]));
672                         }
673                         continue;
674                 }
675                 if (!active->flags.enabled)
676                         continue;
677                 /*
678                  * Below Threshold?
679                  * ----------------
680                  * Turn OFF all cooling devices associated with this
681                  * threshold.
682                  */
683                 for (j = 0; j < active->devices.count; j++) {
684                         result = acpi_bus_set_power(active->devices.handles[j],
685                                                     ACPI_STATE_D3);
686                         if (result) {
687                                 printk(KERN_WARNING PREFIX
688                                               "Unable to turn cooling device [%p] 'off'\n",
689                                               active->devices.handles[j]);
690                                 continue;
691                         }
692                         active->flags.enabled = 0;
693                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
694                                           "Cooling device [%p] now 'off'\n",
695                                           active->devices.handles[j]));
696                 }
697         }
698 }
699
700 static void acpi_thermal_check(void *context);
701
702 static void acpi_thermal_run(unsigned long data)
703 {
704         struct acpi_thermal *tz = (struct acpi_thermal *)data;
705         if (!tz->zombie)
706                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
707 }
708
709 static void acpi_thermal_check(void *data)
710 {
711         int result = 0;
712         struct acpi_thermal *tz = data;
713         unsigned long sleep_time = 0;
714         int i = 0;
715         struct acpi_thermal_state state;
716
717
718         if (!tz) {
719                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
720                 return;
721         }
722
723         state = tz->state;
724
725         result = acpi_thermal_get_temperature(tz);
726         if (result)
727                 return;
728
729         memset(&tz->state, 0, sizeof(tz->state));
730
731         /*
732          * Check Trip Points
733          * -----------------
734          * Compare the current temperature to the trip point values to see
735          * if we've entered one of the thermal policy states.  Note that
736          * this function determines when a state is entered, but the 
737          * individual policy decides when it is exited (e.g. hysteresis).
738          */
739         if (tz->trips.critical.flags.valid)
740                 state.critical |=
741                     (tz->temperature >= tz->trips.critical.temperature);
742         if (tz->trips.hot.flags.valid)
743                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
744         if (tz->trips.passive.flags.valid)
745                 state.passive |=
746                     (tz->temperature >= tz->trips.passive.temperature);
747         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
748                 if (tz->trips.active[i].flags.valid)
749                         state.active |=
750                             (tz->temperature >=
751                              tz->trips.active[i].temperature);
752
753         /*
754          * Invoke Policy
755          * -------------
756          * Separated from the above check to allow individual policy to 
757          * determine when to exit a given state.
758          */
759         if (state.critical)
760                 acpi_thermal_critical(tz);
761         if (state.hot)
762                 acpi_thermal_hot(tz);
763         if (state.passive)
764                 acpi_thermal_passive(tz);
765         if (state.active)
766                 acpi_thermal_active(tz);
767
768         /*
769          * Calculate State
770          * ---------------
771          * Again, separated from the above two to allow independent policy
772          * decisions.
773          */
774         tz->state.critical = tz->trips.critical.flags.enabled;
775         tz->state.hot = tz->trips.hot.flags.enabled;
776         tz->state.passive = tz->trips.passive.flags.enabled;
777         tz->state.active = 0;
778         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
779                 tz->state.active |= tz->trips.active[i].flags.enabled;
780
781         /*
782          * Calculate Sleep Time
783          * --------------------
784          * If we're in the passive state, use _TSP's value.  Otherwise
785          * use the default polling frequency (e.g. _TZP).  If no polling
786          * frequency is specified then we'll wait forever (at least until
787          * a thermal event occurs).  Note that _TSP and _TZD values are
788          * given in 1/10th seconds (we must covert to milliseconds).
789          */
790         if (tz->state.passive)
791                 sleep_time = tz->trips.passive.tsp * 100;
792         else if (tz->polling_frequency > 0)
793                 sleep_time = tz->polling_frequency * 100;
794
795         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
796                           tz->name, tz->temperature, sleep_time));
797
798         /*
799          * Schedule Next Poll
800          * ------------------
801          */
802         if (!sleep_time) {
803                 if (timer_pending(&(tz->timer)))
804                         del_timer(&(tz->timer));
805         } else {
806                 if (timer_pending(&(tz->timer)))
807                         mod_timer(&(tz->timer),
808                                         jiffies + (HZ * sleep_time) / 1000);
809                 else {
810                         tz->timer.data = (unsigned long)tz;
811                         tz->timer.function = acpi_thermal_run;
812                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
813                         add_timer(&(tz->timer));
814                 }
815         }
816
817         return;
818 }
819
820 /* --------------------------------------------------------------------------
821                               FS Interface (/proc)
822    -------------------------------------------------------------------------- */
823
824 static struct proc_dir_entry *acpi_thermal_dir;
825
826 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
827 {
828         struct acpi_thermal *tz = seq->private;
829
830
831         if (!tz)
832                 goto end;
833
834         seq_puts(seq, "state:                   ");
835
836         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
837             && !tz->state.active)
838                 seq_puts(seq, "ok\n");
839         else {
840                 if (tz->state.critical)
841                         seq_puts(seq, "critical ");
842                 if (tz->state.hot)
843                         seq_puts(seq, "hot ");
844                 if (tz->state.passive)
845                         seq_puts(seq, "passive ");
846                 if (tz->state.active)
847                         seq_printf(seq, "active[%d]", tz->state.active_index);
848                 seq_puts(seq, "\n");
849         }
850
851       end:
852         return 0;
853 }
854
855 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
856 {
857         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
858 }
859
860 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
861 {
862         int result = 0;
863         struct acpi_thermal *tz = seq->private;
864
865
866         if (!tz)
867                 goto end;
868
869         result = acpi_thermal_get_temperature(tz);
870         if (result)
871                 goto end;
872
873         seq_printf(seq, "temperature:             %ld C\n",
874                    KELVIN_TO_CELSIUS(tz->temperature));
875
876       end:
877         return 0;
878 }
879
880 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
881 {
882         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
883 }
884
885 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
886 {
887         struct acpi_thermal *tz = seq->private;
888         struct acpi_device *device;
889         acpi_status status;
890
891         int i = 0;
892         int j = 0;
893
894
895         if (!tz)
896                 goto end;
897
898         if (tz->trips.critical.flags.valid)
899                 seq_printf(seq, "critical (S5):           %ld C%s",
900                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
901                            nocrt ? " <disabled>\n" : "\n");
902
903         if (tz->trips.hot.flags.valid)
904                 seq_printf(seq, "hot (S4):                %ld C%s",
905                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
906                            nocrt ? " <disabled>\n" : "\n");
907
908         if (tz->trips.passive.flags.valid) {
909                 seq_printf(seq,
910                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
911                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
912                            tz->trips.passive.tc1, tz->trips.passive.tc2,
913                            tz->trips.passive.tsp);
914                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
915                         status = acpi_bus_get_device(tz->trips.passive.devices.
916                                                      handles[j], &device);
917                         seq_printf(seq, "%4.4s ", status ? "" :
918                                    acpi_device_bid(device));
919                 }
920                 seq_puts(seq, "\n");
921         }
922
923         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
924                 if (!(tz->trips.active[i].flags.valid))
925                         break;
926                 seq_printf(seq, "active[%d]:               %ld C: devices=",
927                            i,
928                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
929                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
930                         status = acpi_bus_get_device(tz->trips.active[i].
931                                                      devices.handles[j],
932                                                      &device);
933                         seq_printf(seq, "%4.4s ", status ? "" :
934                                    acpi_device_bid(device));
935                 }
936                 seq_puts(seq, "\n");
937         }
938
939       end:
940         return 0;
941 }
942
943 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
944 {
945         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
946 }
947
948 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
949 {
950         struct acpi_thermal *tz = seq->private;
951
952
953         if (!tz)
954                 goto end;
955
956         if (!tz->flags.cooling_mode)
957                 seq_puts(seq, "<setting not supported>\n");
958         else
959                 seq_puts(seq, "0 - Active; 1 - Passive\n");
960
961       end:
962         return 0;
963 }
964
965 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
966 {
967         return single_open(file, acpi_thermal_cooling_seq_show,
968                            PDE(inode)->data);
969 }
970
971 static ssize_t
972 acpi_thermal_write_cooling_mode(struct file *file,
973                                 const char __user * buffer,
974                                 size_t count, loff_t * ppos)
975 {
976         struct seq_file *m = file->private_data;
977         struct acpi_thermal *tz = m->private;
978         int result = 0;
979         char mode_string[12] = { '\0' };
980
981
982         if (!tz || (count > sizeof(mode_string) - 1))
983                 return -EINVAL;
984
985         if (!tz->flags.cooling_mode)
986                 return -ENODEV;
987
988         if (copy_from_user(mode_string, buffer, count))
989                 return -EFAULT;
990
991         mode_string[count] = '\0';
992
993         result = acpi_thermal_set_cooling_mode(tz,
994                                                simple_strtoul(mode_string, NULL,
995                                                               0));
996         if (result)
997                 return result;
998
999         acpi_thermal_check(tz);
1000
1001         return count;
1002 }
1003
1004 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1005 {
1006         struct acpi_thermal *tz = seq->private;
1007
1008
1009         if (!tz)
1010                 goto end;
1011
1012         if (!tz->polling_frequency) {
1013                 seq_puts(seq, "<polling disabled>\n");
1014                 goto end;
1015         }
1016
1017         seq_printf(seq, "polling frequency:       %lu seconds\n",
1018                    (tz->polling_frequency / 10));
1019
1020       end:
1021         return 0;
1022 }
1023
1024 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1025 {
1026         return single_open(file, acpi_thermal_polling_seq_show,
1027                            PDE(inode)->data);
1028 }
1029
1030 static ssize_t
1031 acpi_thermal_write_polling(struct file *file,
1032                            const char __user * buffer,
1033                            size_t count, loff_t * ppos)
1034 {
1035         struct seq_file *m = file->private_data;
1036         struct acpi_thermal *tz = m->private;
1037         int result = 0;
1038         char polling_string[12] = { '\0' };
1039         int seconds = 0;
1040
1041
1042         if (!tz || (count > sizeof(polling_string) - 1))
1043                 return -EINVAL;
1044
1045         if (copy_from_user(polling_string, buffer, count))
1046                 return -EFAULT;
1047
1048         polling_string[count] = '\0';
1049
1050         seconds = simple_strtoul(polling_string, NULL, 0);
1051
1052         result = acpi_thermal_set_polling(tz, seconds);
1053         if (result)
1054                 return result;
1055
1056         acpi_thermal_check(tz);
1057
1058         return count;
1059 }
1060
1061 static int acpi_thermal_add_fs(struct acpi_device *device)
1062 {
1063         struct proc_dir_entry *entry = NULL;
1064
1065
1066         if (!acpi_device_dir(device)) {
1067                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1068                                                      acpi_thermal_dir);
1069                 if (!acpi_device_dir(device))
1070                         return -ENODEV;
1071                 acpi_device_dir(device)->owner = THIS_MODULE;
1072         }
1073
1074         /* 'state' [R] */
1075         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1076                                   S_IRUGO, acpi_device_dir(device));
1077         if (!entry)
1078                 return -ENODEV;
1079         else {
1080                 entry->proc_fops = &acpi_thermal_state_fops;
1081                 entry->data = acpi_driver_data(device);
1082                 entry->owner = THIS_MODULE;
1083         }
1084
1085         /* 'temperature' [R] */
1086         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1087                                   S_IRUGO, acpi_device_dir(device));
1088         if (!entry)
1089                 return -ENODEV;
1090         else {
1091                 entry->proc_fops = &acpi_thermal_temp_fops;
1092                 entry->data = acpi_driver_data(device);
1093                 entry->owner = THIS_MODULE;
1094         }
1095
1096         /* 'trip_points' [R] */
1097         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1098                                   S_IRUGO,
1099                                   acpi_device_dir(device));
1100         if (!entry)
1101                 return -ENODEV;
1102         else {
1103                 entry->proc_fops = &acpi_thermal_trip_fops;
1104                 entry->data = acpi_driver_data(device);
1105                 entry->owner = THIS_MODULE;
1106         }
1107
1108         /* 'cooling_mode' [R/W] */
1109         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1110                                   S_IFREG | S_IRUGO | S_IWUSR,
1111                                   acpi_device_dir(device));
1112         if (!entry)
1113                 return -ENODEV;
1114         else {
1115                 entry->proc_fops = &acpi_thermal_cooling_fops;
1116                 entry->data = acpi_driver_data(device);
1117                 entry->owner = THIS_MODULE;
1118         }
1119
1120         /* 'polling_frequency' [R/W] */
1121         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1122                                   S_IFREG | S_IRUGO | S_IWUSR,
1123                                   acpi_device_dir(device));
1124         if (!entry)
1125                 return -ENODEV;
1126         else {
1127                 entry->proc_fops = &acpi_thermal_polling_fops;
1128                 entry->data = acpi_driver_data(device);
1129                 entry->owner = THIS_MODULE;
1130         }
1131
1132         return 0;
1133 }
1134
1135 static int acpi_thermal_remove_fs(struct acpi_device *device)
1136 {
1137
1138         if (acpi_device_dir(device)) {
1139                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1140                                   acpi_device_dir(device));
1141                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1142                                   acpi_device_dir(device));
1143                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1144                                   acpi_device_dir(device));
1145                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1146                                   acpi_device_dir(device));
1147                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1148                                   acpi_device_dir(device));
1149                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1150                 acpi_device_dir(device) = NULL;
1151         }
1152
1153         return 0;
1154 }
1155
1156 /* --------------------------------------------------------------------------
1157                                  Driver Interface
1158    -------------------------------------------------------------------------- */
1159
1160 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1161 {
1162         struct acpi_thermal *tz = data;
1163         struct acpi_device *device = NULL;
1164
1165
1166         if (!tz)
1167                 return;
1168
1169         device = tz->device;
1170
1171         switch (event) {
1172         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1173                 acpi_thermal_check(tz);
1174                 break;
1175         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1176                 acpi_thermal_get_trip_points(tz);
1177                 acpi_thermal_check(tz);
1178                 acpi_bus_generate_proc_event(device, event, 0);
1179                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1180                                                   device->dev.bus_id, event, 0);
1181                 break;
1182         case ACPI_THERMAL_NOTIFY_DEVICES:
1183                 if (tz->flags.devices)
1184                         acpi_thermal_get_devices(tz);
1185                 acpi_bus_generate_proc_event(device, event, 0);
1186                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1187                                                   device->dev.bus_id, event, 0);
1188                 break;
1189         default:
1190                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1191                                   "Unsupported event [0x%x]\n", event));
1192                 break;
1193         }
1194
1195         return;
1196 }
1197
1198 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1199 {
1200         int result = 0;
1201
1202
1203         if (!tz)
1204                 return -EINVAL;
1205
1206         /* Get temperature [_TMP] (required) */
1207         result = acpi_thermal_get_temperature(tz);
1208         if (result)
1209                 return result;
1210
1211         /* Get trip points [_CRT, _PSV, etc.] (required) */
1212         result = acpi_thermal_get_trip_points(tz);
1213         if (result)
1214                 return result;
1215
1216         /* Set the cooling mode [_SCP] to active cooling (default) */
1217         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1218         if (!result)
1219                 tz->flags.cooling_mode = 1;
1220
1221         /* Get default polling frequency [_TZP] (optional) */
1222         if (tzp)
1223                 tz->polling_frequency = tzp;
1224         else
1225                 acpi_thermal_get_polling_frequency(tz);
1226
1227         /* Get devices in this thermal zone [_TZD] (optional) */
1228         result = acpi_thermal_get_devices(tz);
1229         if (!result)
1230                 tz->flags.devices = 1;
1231
1232         return 0;
1233 }
1234
1235 static int acpi_thermal_add(struct acpi_device *device)
1236 {
1237         int result = 0;
1238         acpi_status status = AE_OK;
1239         struct acpi_thermal *tz = NULL;
1240
1241
1242         if (!device)
1243                 return -EINVAL;
1244
1245         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1246         if (!tz)
1247                 return -ENOMEM;
1248
1249         tz->device = device;
1250         strcpy(tz->name, device->pnp.bus_id);
1251         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1252         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1253         acpi_driver_data(device) = tz;
1254
1255         result = acpi_thermal_get_info(tz);
1256         if (result)
1257                 goto end;
1258
1259         result = acpi_thermal_add_fs(device);
1260         if (result)
1261                 goto end;
1262
1263         init_timer(&tz->timer);
1264
1265         acpi_thermal_check(tz);
1266
1267         status = acpi_install_notify_handler(device->handle,
1268                                              ACPI_DEVICE_NOTIFY,
1269                                              acpi_thermal_notify, tz);
1270         if (ACPI_FAILURE(status)) {
1271                 result = -ENODEV;
1272                 goto end;
1273         }
1274
1275         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1276                acpi_device_name(device), acpi_device_bid(device),
1277                KELVIN_TO_CELSIUS(tz->temperature));
1278
1279       end:
1280         if (result) {
1281                 acpi_thermal_remove_fs(device);
1282                 kfree(tz);
1283         }
1284
1285         return result;
1286 }
1287
1288 static int acpi_thermal_remove(struct acpi_device *device, int type)
1289 {
1290         acpi_status status = AE_OK;
1291         struct acpi_thermal *tz = NULL;
1292
1293
1294         if (!device || !acpi_driver_data(device))
1295                 return -EINVAL;
1296
1297         tz = acpi_driver_data(device);
1298
1299         /* avoid timer adding new defer task */
1300         tz->zombie = 1;
1301         /* wait for running timer (on other CPUs) finish */
1302         del_timer_sync(&(tz->timer));
1303         /* synchronize deferred task */
1304         acpi_os_wait_events_complete(NULL);
1305         /* deferred task may reinsert timer */
1306         del_timer_sync(&(tz->timer));
1307
1308         status = acpi_remove_notify_handler(device->handle,
1309                                             ACPI_DEVICE_NOTIFY,
1310                                             acpi_thermal_notify);
1311
1312         /* Terminate policy */
1313         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1314                 tz->trips.passive.flags.enabled = 0;
1315                 acpi_thermal_passive(tz);
1316         }
1317         if (tz->trips.active[0].flags.valid
1318             && tz->trips.active[0].flags.enabled) {
1319                 tz->trips.active[0].flags.enabled = 0;
1320                 acpi_thermal_active(tz);
1321         }
1322
1323         acpi_thermal_remove_fs(device);
1324
1325         kfree(tz);
1326         return 0;
1327 }
1328
1329 static int acpi_thermal_resume(struct acpi_device *device)
1330 {
1331         struct acpi_thermal *tz = NULL;
1332         int i, j, power_state, result;
1333
1334
1335         if (!device || !acpi_driver_data(device))
1336                 return -EINVAL;
1337
1338         tz = acpi_driver_data(device);
1339
1340         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1341                 if (!(&tz->trips.active[i]))
1342                         break;
1343                 if (!tz->trips.active[i].flags.valid)
1344                         break;
1345                 tz->trips.active[i].flags.enabled = 1;
1346                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1347                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1348                             handles[j], &power_state);
1349                         if (result || (power_state != ACPI_STATE_D0)) {
1350                                 tz->trips.active[i].flags.enabled = 0;
1351                                 break;
1352                         }
1353                 }
1354                 tz->state.active |= tz->trips.active[i].flags.enabled;
1355         }
1356
1357         acpi_thermal_check(tz);
1358
1359         return AE_OK;
1360 }
1361
1362 #ifdef CONFIG_DMI
1363 static int thermal_act(struct dmi_system_id *d) {
1364
1365         if (act == 0) {
1366                 printk(KERN_NOTICE "ACPI: %s detected: "
1367                         "disabling all active thermal trip points\n", d->ident);
1368                 act = -1;
1369         }
1370         return 0;
1371 }
1372 static int thermal_nocrt(struct dmi_system_id *d) {
1373
1374         printk(KERN_NOTICE "ACPI: %s detected: "
1375                 "disabling all critical thermal trip point actions.\n", d->ident);
1376         nocrt = 1;
1377         return 0;
1378 }
1379 static int thermal_tzp(struct dmi_system_id *d) {
1380
1381         if (tzp == 0) {
1382                 printk(KERN_NOTICE "ACPI: %s detected: "
1383                         "enabling thermal zone polling\n", d->ident);
1384                 tzp = 300;      /* 300 dS = 30 Seconds */
1385         }
1386         return 0;
1387 }
1388 static int thermal_psv(struct dmi_system_id *d) {
1389
1390         if (psv == 0) {
1391                 printk(KERN_NOTICE "ACPI: %s detected: "
1392                         "disabling all passive thermal trip points\n", d->ident);
1393                 psv = -1;
1394         }
1395         return 0;
1396 }
1397
1398 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1399         /*
1400          * Award BIOS on this AOpen makes thermal control almost worthless.
1401          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1402          */
1403         {
1404          .callback = thermal_act,
1405          .ident = "AOpen i915GMm-HFS",
1406          .matches = {
1407                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1408                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1409                 },
1410         },
1411         {
1412          .callback = thermal_psv,
1413          .ident = "AOpen i915GMm-HFS",
1414          .matches = {
1415                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1416                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1417                 },
1418         },
1419         {
1420          .callback = thermal_tzp,
1421          .ident = "AOpen i915GMm-HFS",
1422          .matches = {
1423                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1424                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1425                 },
1426         },
1427         {
1428          .callback = thermal_nocrt,
1429          .ident = "Gigabyte GA-7ZX",
1430          .matches = {
1431                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1432                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1433                 },
1434         },
1435         {}
1436 };
1437 #endif /* CONFIG_DMI */
1438
1439 static int __init acpi_thermal_init(void)
1440 {
1441         int result = 0;
1442
1443         dmi_check_system(thermal_dmi_table);
1444
1445         if (off) {
1446                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1447                 return -ENODEV;
1448         }
1449         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1450         if (!acpi_thermal_dir)
1451                 return -ENODEV;
1452         acpi_thermal_dir->owner = THIS_MODULE;
1453
1454         result = acpi_bus_register_driver(&acpi_thermal_driver);
1455         if (result < 0) {
1456                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1457                 return -ENODEV;
1458         }
1459
1460         return 0;
1461 }
1462
1463 static void __exit acpi_thermal_exit(void)
1464 {
1465
1466         acpi_bus_unregister_driver(&acpi_thermal_driver);
1467
1468         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1469
1470         return;
1471 }
1472
1473 module_init(acpi_thermal_init);
1474 module_exit(acpi_thermal_exit);