3a0af9a8cd2712a208bd67e347d532a3059d0f71
[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/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         struct mutex lock;
199 };
200
201 static const struct file_operations acpi_thermal_state_fops = {
202         .open = acpi_thermal_state_open_fs,
203         .read = seq_read,
204         .llseek = seq_lseek,
205         .release = single_release,
206 };
207
208 static const struct file_operations acpi_thermal_temp_fops = {
209         .open = acpi_thermal_temp_open_fs,
210         .read = seq_read,
211         .llseek = seq_lseek,
212         .release = single_release,
213 };
214
215 static const struct file_operations acpi_thermal_trip_fops = {
216         .open = acpi_thermal_trip_open_fs,
217         .read = seq_read,
218         .llseek = seq_lseek,
219         .release = single_release,
220 };
221
222 static const struct file_operations acpi_thermal_cooling_fops = {
223         .open = acpi_thermal_cooling_open_fs,
224         .read = seq_read,
225         .write = acpi_thermal_write_cooling_mode,
226         .llseek = seq_lseek,
227         .release = single_release,
228 };
229
230 static const struct file_operations acpi_thermal_polling_fops = {
231         .open = acpi_thermal_polling_open_fs,
232         .read = seq_read,
233         .write = acpi_thermal_write_polling,
234         .llseek = seq_lseek,
235         .release = single_release,
236 };
237
238 /* --------------------------------------------------------------------------
239                              Thermal Zone Management
240    -------------------------------------------------------------------------- */
241
242 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
243 {
244         acpi_status status = AE_OK;
245
246
247         if (!tz)
248                 return -EINVAL;
249
250         tz->last_temperature = tz->temperature;
251
252         status =
253             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
254         if (ACPI_FAILURE(status))
255                 return -ENODEV;
256
257         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
258                           tz->temperature));
259
260         return 0;
261 }
262
263 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
264 {
265         acpi_status status = AE_OK;
266
267
268         if (!tz)
269                 return -EINVAL;
270
271         status =
272             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
273                                   &tz->polling_frequency);
274         if (ACPI_FAILURE(status))
275                 return -ENODEV;
276
277         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
278                           tz->polling_frequency));
279
280         return 0;
281 }
282
283 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
284 {
285
286         if (!tz)
287                 return -EINVAL;
288
289         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
290
291         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
292                           "Polling frequency set to %lu seconds\n",
293                           tz->polling_frequency/10));
294
295         return 0;
296 }
297
298 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
299 {
300         acpi_status status = AE_OK;
301         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
302         struct acpi_object_list arg_list = { 1, &arg0 };
303         acpi_handle handle = NULL;
304
305
306         if (!tz)
307                 return -EINVAL;
308
309         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
310         if (ACPI_FAILURE(status)) {
311                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
312                 return -ENODEV;
313         }
314
315         arg0.integer.value = mode;
316
317         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
318         if (ACPI_FAILURE(status))
319                 return -ENODEV;
320
321         return 0;
322 }
323
324 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
325 {
326         acpi_status status = AE_OK;
327         int i = 0;
328
329
330         if (!tz)
331                 return -EINVAL;
332
333         /* Critical Shutdown (required) */
334
335         status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
336                                        &tz->trips.critical.temperature);
337         if (ACPI_FAILURE(status)) {
338                 tz->trips.critical.flags.valid = 0;
339                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
340                 return -ENODEV;
341         } else {
342                 tz->trips.critical.flags.valid = 1;
343                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
344                                   "Found critical threshold [%lu]\n",
345                                   tz->trips.critical.temperature));
346         }
347
348         if (tz->trips.critical.flags.valid == 1) {
349                 if (crt == -1) {
350                         tz->trips.critical.flags.valid = 0;
351                 } else if (crt > 0) {
352                         unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
353
354                         /*
355                          * Allow override to lower critical threshold
356                          */
357                         if (crt_k < tz->trips.critical.temperature)
358                                 tz->trips.critical.temperature = crt_k;
359                 }
360         }
361
362         /* Critical Sleep (optional) */
363
364         status =
365             acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
366                                   &tz->trips.hot.temperature);
367         if (ACPI_FAILURE(status)) {
368                 tz->trips.hot.flags.valid = 0;
369                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
370         } else {
371                 tz->trips.hot.flags.valid = 1;
372                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
373                                   tz->trips.hot.temperature));
374         }
375
376         /* Passive: Processors (optional) */
377
378         if (psv == -1) {
379                 status = AE_SUPPORT;
380         } else if (psv > 0) {
381                 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
382                 status = AE_OK;
383         } else {
384                 status = acpi_evaluate_integer(tz->device->handle,
385                         "_PSV", NULL, &tz->trips.passive.temperature);
386         }
387
388         if (ACPI_FAILURE(status)) {
389                 tz->trips.passive.flags.valid = 0;
390                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
391         } else {
392                 tz->trips.passive.flags.valid = 1;
393
394                 status =
395                     acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
396                                           &tz->trips.passive.tc1);
397                 if (ACPI_FAILURE(status))
398                         tz->trips.passive.flags.valid = 0;
399
400                 status =
401                     acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
402                                           &tz->trips.passive.tc2);
403                 if (ACPI_FAILURE(status))
404                         tz->trips.passive.flags.valid = 0;
405
406                 status =
407                     acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
408                                           &tz->trips.passive.tsp);
409                 if (ACPI_FAILURE(status))
410                         tz->trips.passive.flags.valid = 0;
411
412                 status =
413                     acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
414                                             &tz->trips.passive.devices);
415                 if (ACPI_FAILURE(status))
416                         tz->trips.passive.flags.valid = 0;
417
418                 if (!tz->trips.passive.flags.valid)
419                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
420                 else
421                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
422                                           "Found passive threshold [%lu]\n",
423                                           tz->trips.passive.temperature));
424         }
425
426         /* Active: Fans, etc. (optional) */
427
428         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
429
430                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
431
432                 if (act == -1)
433                         break;  /* disable all active trip points */
434
435                 status = acpi_evaluate_integer(tz->device->handle,
436                         name, NULL, &tz->trips.active[i].temperature);
437
438                 if (ACPI_FAILURE(status)) {
439                         if (i == 0)     /* no active trip points */
440                                 break;
441                         if (act <= 0)   /* no override requested */
442                                 break;
443                         if (i == 1) {   /* 1 trip point */
444                                 tz->trips.active[0].temperature =
445                                         CELSIUS_TO_KELVIN(act);
446                         } else {        /* multiple trips */
447                                 /*
448                                  * Don't allow override higher than
449                                  * the next higher trip point
450                                  */
451                                 tz->trips.active[i - 1].temperature =
452                                     (tz->trips.active[i - 2].temperature <
453                                         CELSIUS_TO_KELVIN(act) ?
454                                         tz->trips.active[i - 2].temperature :
455                                         CELSIUS_TO_KELVIN(act));
456                         }
457                         break;
458                 }
459
460                 name[2] = 'L';
461                 status =
462                     acpi_evaluate_reference(tz->device->handle, name, NULL,
463                                             &tz->trips.active[i].devices);
464                 if (ACPI_SUCCESS(status)) {
465                         tz->trips.active[i].flags.valid = 1;
466                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
467                                           "Found active threshold [%d]:[%lu]\n",
468                                           i, tz->trips.active[i].temperature));
469                 } else
470                         ACPI_EXCEPTION((AE_INFO, status,
471                                         "Invalid active threshold [%d]", i));
472         }
473
474         return 0;
475 }
476
477 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
478 {
479         acpi_status status = AE_OK;
480
481
482         if (!tz)
483                 return -EINVAL;
484
485         status =
486             acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
487         if (ACPI_FAILURE(status))
488                 return -ENODEV;
489
490         return 0;
491 }
492
493 static int acpi_thermal_critical(struct acpi_thermal *tz)
494 {
495         if (!tz || !tz->trips.critical.flags.valid)
496                 return -EINVAL;
497
498         if (tz->temperature >= tz->trips.critical.temperature) {
499                 printk(KERN_WARNING PREFIX "Critical trip point\n");
500                 tz->trips.critical.flags.enabled = 1;
501         } else if (tz->trips.critical.flags.enabled)
502                 tz->trips.critical.flags.enabled = 0;
503
504         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
505                                 tz->trips.critical.flags.enabled);
506         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
507                                           tz->device->dev.bus_id,
508                                           ACPI_THERMAL_NOTIFY_CRITICAL,
509                                           tz->trips.critical.flags.enabled);
510
511         /* take no action if nocrt is set */
512         if(!nocrt) {
513                 printk(KERN_EMERG
514                         "Critical temperature reached (%ld C), shutting down.\n",
515                         KELVIN_TO_CELSIUS(tz->temperature));
516                 orderly_poweroff(true);
517         }
518
519         return 0;
520 }
521
522 static int acpi_thermal_hot(struct acpi_thermal *tz)
523 {
524         if (!tz || !tz->trips.hot.flags.valid)
525                 return -EINVAL;
526
527         if (tz->temperature >= tz->trips.hot.temperature) {
528                 printk(KERN_WARNING PREFIX "Hot trip point\n");
529                 tz->trips.hot.flags.enabled = 1;
530         } else if (tz->trips.hot.flags.enabled)
531                 tz->trips.hot.flags.enabled = 0;
532
533         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
534                                 tz->trips.hot.flags.enabled);
535         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
536                                           tz->device->dev.bus_id,
537                                           ACPI_THERMAL_NOTIFY_HOT,
538                                           tz->trips.hot.flags.enabled);
539
540         /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
541
542         return 0;
543 }
544
545 static void acpi_thermal_passive(struct acpi_thermal *tz)
546 {
547         int result = 1;
548         struct acpi_thermal_passive *passive = NULL;
549         int trend = 0;
550         int i = 0;
551
552
553         if (!tz || !tz->trips.passive.flags.valid)
554                 return;
555
556         passive = &(tz->trips.passive);
557
558         /*
559          * Above Trip?
560          * -----------
561          * Calculate the thermal trend (using the passive cooling equation)
562          * and modify the performance limit for all passive cooling devices
563          * accordingly.  Note that we assume symmetry.
564          */
565         if (tz->temperature >= passive->temperature) {
566                 trend =
567                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
568                     (passive->tc2 * (tz->temperature - passive->temperature));
569                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
570                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
571                                   trend, passive->tc1, tz->temperature,
572                                   tz->last_temperature, passive->tc2,
573                                   tz->temperature, passive->temperature));
574                 passive->flags.enabled = 1;
575                 /* Heating up? */
576                 if (trend > 0)
577                         for (i = 0; i < passive->devices.count; i++)
578                                 acpi_processor_set_thermal_limit(passive->
579                                                                  devices.
580                                                                  handles[i],
581                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
582                 /* Cooling off? */
583                 else if (trend < 0) {
584                         for (i = 0; i < passive->devices.count; i++)
585                                 /*
586                                  * assume that we are on highest
587                                  * freq/lowest thrott and can leave
588                                  * passive mode, even in error case
589                                  */
590                                 if (!acpi_processor_set_thermal_limit
591                                     (passive->devices.handles[i],
592                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
593                                         result = 0;
594                         /*
595                          * Leave cooling mode, even if the temp might
596                          * higher than trip point This is because some
597                          * machines might have long thermal polling
598                          * frequencies (tsp) defined. We will fall back
599                          * into passive mode in next cycle (probably quicker)
600                          */
601                         if (result) {
602                                 passive->flags.enabled = 0;
603                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
604                                                   "Disabling passive cooling, still above threshold,"
605                                                   " but we are cooling down\n"));
606                         }
607                 }
608                 return;
609         }
610
611         /*
612          * Below Trip?
613          * -----------
614          * Implement passive cooling hysteresis to slowly increase performance
615          * and avoid thrashing around the passive trip point.  Note that we
616          * assume symmetry.
617          */
618         if (!passive->flags.enabled)
619                 return;
620         for (i = 0; i < passive->devices.count; i++)
621                 if (!acpi_processor_set_thermal_limit
622                     (passive->devices.handles[i],
623                      ACPI_PROCESSOR_LIMIT_DECREMENT))
624                         result = 0;
625         if (result) {
626                 passive->flags.enabled = 0;
627                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
628                                   "Disabling passive cooling (zone is cool)\n"));
629         }
630 }
631
632 static void acpi_thermal_active(struct acpi_thermal *tz)
633 {
634         int result = 0;
635         struct acpi_thermal_active *active = NULL;
636         int i = 0;
637         int j = 0;
638         unsigned long maxtemp = 0;
639
640
641         if (!tz)
642                 return;
643
644         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
645                 active = &(tz->trips.active[i]);
646                 if (!active || !active->flags.valid)
647                         break;
648                 if (tz->temperature >= active->temperature) {
649                         /*
650                          * Above Threshold?
651                          * ----------------
652                          * If not already enabled, turn ON all cooling devices
653                          * associated with this active threshold.
654                          */
655                         if (active->temperature > maxtemp)
656                                 tz->state.active_index = i;
657                         maxtemp = active->temperature;
658                         if (active->flags.enabled)
659                                 continue;
660                         for (j = 0; j < active->devices.count; j++) {
661                                 result =
662                                     acpi_bus_set_power(active->devices.
663                                                        handles[j],
664                                                        ACPI_STATE_D0);
665                                 if (result) {
666                                         printk(KERN_WARNING PREFIX
667                                                       "Unable to turn cooling device [%p] 'on'\n",
668                                                       active->devices.
669                                                       handles[j]);
670                                         continue;
671                                 }
672                                 active->flags.enabled = 1;
673                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
674                                                   "Cooling device [%p] now 'on'\n",
675                                                   active->devices.handles[j]));
676                         }
677                         continue;
678                 }
679                 if (!active->flags.enabled)
680                         continue;
681                 /*
682                  * Below Threshold?
683                  * ----------------
684                  * Turn OFF all cooling devices associated with this
685                  * threshold.
686                  */
687                 for (j = 0; j < active->devices.count; j++) {
688                         result = acpi_bus_set_power(active->devices.handles[j],
689                                                     ACPI_STATE_D3);
690                         if (result) {
691                                 printk(KERN_WARNING PREFIX
692                                               "Unable to turn cooling device [%p] 'off'\n",
693                                               active->devices.handles[j]);
694                                 continue;
695                         }
696                         active->flags.enabled = 0;
697                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
698                                           "Cooling device [%p] now 'off'\n",
699                                           active->devices.handles[j]));
700                 }
701         }
702 }
703
704 static void acpi_thermal_check(void *context);
705
706 static void acpi_thermal_run(unsigned long data)
707 {
708         struct acpi_thermal *tz = (struct acpi_thermal *)data;
709         if (!tz->zombie)
710                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
711 }
712
713 static void acpi_thermal_check(void *data)
714 {
715         int result = 0;
716         struct acpi_thermal *tz = data;
717         unsigned long sleep_time = 0;
718         unsigned long timeout_jiffies = 0;
719         int i = 0;
720         struct acpi_thermal_state state;
721
722
723         if (!tz) {
724                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
725                 return;
726         }
727
728         /* Check if someone else is already running */
729         if (!mutex_trylock(&tz->lock))
730                 return;
731
732         state = tz->state;
733
734         result = acpi_thermal_get_temperature(tz);
735         if (result)
736                 goto unlock;
737
738         memset(&tz->state, 0, sizeof(tz->state));
739
740         /*
741          * Check Trip Points
742          * -----------------
743          * Compare the current temperature to the trip point values to see
744          * if we've entered one of the thermal policy states.  Note that
745          * this function determines when a state is entered, but the 
746          * individual policy decides when it is exited (e.g. hysteresis).
747          */
748         if (tz->trips.critical.flags.valid)
749                 state.critical |=
750                     (tz->temperature >= tz->trips.critical.temperature);
751         if (tz->trips.hot.flags.valid)
752                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
753         if (tz->trips.passive.flags.valid)
754                 state.passive |=
755                     (tz->temperature >= tz->trips.passive.temperature);
756         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
757                 if (tz->trips.active[i].flags.valid)
758                         state.active |=
759                             (tz->temperature >=
760                              tz->trips.active[i].temperature);
761
762         /*
763          * Invoke Policy
764          * -------------
765          * Separated from the above check to allow individual policy to 
766          * determine when to exit a given state.
767          */
768         if (state.critical)
769                 acpi_thermal_critical(tz);
770         if (state.hot)
771                 acpi_thermal_hot(tz);
772         if (state.passive)
773                 acpi_thermal_passive(tz);
774         if (state.active)
775                 acpi_thermal_active(tz);
776
777         /*
778          * Calculate State
779          * ---------------
780          * Again, separated from the above two to allow independent policy
781          * decisions.
782          */
783         tz->state.critical = tz->trips.critical.flags.enabled;
784         tz->state.hot = tz->trips.hot.flags.enabled;
785         tz->state.passive = tz->trips.passive.flags.enabled;
786         tz->state.active = 0;
787         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
788                 tz->state.active |= tz->trips.active[i].flags.enabled;
789
790         /*
791          * Calculate Sleep Time
792          * --------------------
793          * If we're in the passive state, use _TSP's value.  Otherwise
794          * use the default polling frequency (e.g. _TZP).  If no polling
795          * frequency is specified then we'll wait forever (at least until
796          * a thermal event occurs).  Note that _TSP and _TZD values are
797          * given in 1/10th seconds (we must covert to milliseconds).
798          */
799         if (tz->state.passive) {
800                 sleep_time = tz->trips.passive.tsp * 100;
801                 timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
802         } else if (tz->polling_frequency > 0) {
803                 sleep_time = tz->polling_frequency * 100;
804                 timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
805         }
806
807         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
808                           tz->name, tz->temperature, sleep_time));
809
810         /*
811          * Schedule Next Poll
812          * ------------------
813          */
814         if (!sleep_time) {
815                 if (timer_pending(&(tz->timer)))
816                         del_timer(&(tz->timer));
817         } else {
818                 if (timer_pending(&(tz->timer)))
819                         mod_timer(&(tz->timer), timeout_jiffies);
820                 else {
821                         tz->timer.data = (unsigned long)tz;
822                         tz->timer.function = acpi_thermal_run;
823                         tz->timer.expires = timeout_jiffies;
824                         add_timer(&(tz->timer));
825                 }
826         }
827       unlock:
828         mutex_unlock(&tz->lock);
829 }
830
831 /* --------------------------------------------------------------------------
832                               FS Interface (/proc)
833    -------------------------------------------------------------------------- */
834
835 static struct proc_dir_entry *acpi_thermal_dir;
836
837 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
838 {
839         struct acpi_thermal *tz = seq->private;
840
841
842         if (!tz)
843                 goto end;
844
845         seq_puts(seq, "state:                   ");
846
847         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
848             && !tz->state.active)
849                 seq_puts(seq, "ok\n");
850         else {
851                 if (tz->state.critical)
852                         seq_puts(seq, "critical ");
853                 if (tz->state.hot)
854                         seq_puts(seq, "hot ");
855                 if (tz->state.passive)
856                         seq_puts(seq, "passive ");
857                 if (tz->state.active)
858                         seq_printf(seq, "active[%d]", tz->state.active_index);
859                 seq_puts(seq, "\n");
860         }
861
862       end:
863         return 0;
864 }
865
866 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
867 {
868         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
869 }
870
871 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
872 {
873         int result = 0;
874         struct acpi_thermal *tz = seq->private;
875
876
877         if (!tz)
878                 goto end;
879
880         result = acpi_thermal_get_temperature(tz);
881         if (result)
882                 goto end;
883
884         seq_printf(seq, "temperature:             %ld C\n",
885                    KELVIN_TO_CELSIUS(tz->temperature));
886
887       end:
888         return 0;
889 }
890
891 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
892 {
893         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
894 }
895
896 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
897 {
898         struct acpi_thermal *tz = seq->private;
899         struct acpi_device *device;
900         acpi_status status;
901
902         int i = 0;
903         int j = 0;
904
905
906         if (!tz)
907                 goto end;
908
909         if (tz->trips.critical.flags.valid)
910                 seq_printf(seq, "critical (S5):           %ld C%s",
911                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
912                            nocrt ? " <disabled>\n" : "\n");
913
914         if (tz->trips.hot.flags.valid)
915                 seq_printf(seq, "hot (S4):                %ld C%s",
916                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
917                            nocrt ? " <disabled>\n" : "\n");
918
919         if (tz->trips.passive.flags.valid) {
920                 seq_printf(seq,
921                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
922                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
923                            tz->trips.passive.tc1, tz->trips.passive.tc2,
924                            tz->trips.passive.tsp);
925                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
926                         status = acpi_bus_get_device(tz->trips.passive.devices.
927                                                      handles[j], &device);
928                         seq_printf(seq, "%4.4s ", status ? "" :
929                                    acpi_device_bid(device));
930                 }
931                 seq_puts(seq, "\n");
932         }
933
934         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
935                 if (!(tz->trips.active[i].flags.valid))
936                         break;
937                 seq_printf(seq, "active[%d]:               %ld C: devices=",
938                            i,
939                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
940                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
941                         status = acpi_bus_get_device(tz->trips.active[i].
942                                                      devices.handles[j],
943                                                      &device);
944                         seq_printf(seq, "%4.4s ", status ? "" :
945                                    acpi_device_bid(device));
946                 }
947                 seq_puts(seq, "\n");
948         }
949
950       end:
951         return 0;
952 }
953
954 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
955 {
956         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
957 }
958
959 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
960 {
961         struct acpi_thermal *tz = seq->private;
962
963
964         if (!tz)
965                 goto end;
966
967         if (!tz->flags.cooling_mode)
968                 seq_puts(seq, "<setting not supported>\n");
969         else
970                 seq_puts(seq, "0 - Active; 1 - Passive\n");
971
972       end:
973         return 0;
974 }
975
976 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
977 {
978         return single_open(file, acpi_thermal_cooling_seq_show,
979                            PDE(inode)->data);
980 }
981
982 static ssize_t
983 acpi_thermal_write_cooling_mode(struct file *file,
984                                 const char __user * buffer,
985                                 size_t count, loff_t * ppos)
986 {
987         struct seq_file *m = file->private_data;
988         struct acpi_thermal *tz = m->private;
989         int result = 0;
990         char mode_string[12] = { '\0' };
991
992
993         if (!tz || (count > sizeof(mode_string) - 1))
994                 return -EINVAL;
995
996         if (!tz->flags.cooling_mode)
997                 return -ENODEV;
998
999         if (copy_from_user(mode_string, buffer, count))
1000                 return -EFAULT;
1001
1002         mode_string[count] = '\0';
1003
1004         result = acpi_thermal_set_cooling_mode(tz,
1005                                                simple_strtoul(mode_string, NULL,
1006                                                               0));
1007         if (result)
1008                 return result;
1009
1010         acpi_thermal_check(tz);
1011
1012         return count;
1013 }
1014
1015 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1016 {
1017         struct acpi_thermal *tz = seq->private;
1018
1019
1020         if (!tz)
1021                 goto end;
1022
1023         if (!tz->polling_frequency) {
1024                 seq_puts(seq, "<polling disabled>\n");
1025                 goto end;
1026         }
1027
1028         seq_printf(seq, "polling frequency:       %lu seconds\n",
1029                    (tz->polling_frequency / 10));
1030
1031       end:
1032         return 0;
1033 }
1034
1035 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1036 {
1037         return single_open(file, acpi_thermal_polling_seq_show,
1038                            PDE(inode)->data);
1039 }
1040
1041 static ssize_t
1042 acpi_thermal_write_polling(struct file *file,
1043                            const char __user * buffer,
1044                            size_t count, loff_t * ppos)
1045 {
1046         struct seq_file *m = file->private_data;
1047         struct acpi_thermal *tz = m->private;
1048         int result = 0;
1049         char polling_string[12] = { '\0' };
1050         int seconds = 0;
1051
1052
1053         if (!tz || (count > sizeof(polling_string) - 1))
1054                 return -EINVAL;
1055
1056         if (copy_from_user(polling_string, buffer, count))
1057                 return -EFAULT;
1058
1059         polling_string[count] = '\0';
1060
1061         seconds = simple_strtoul(polling_string, NULL, 0);
1062
1063         result = acpi_thermal_set_polling(tz, seconds);
1064         if (result)
1065                 return result;
1066
1067         acpi_thermal_check(tz);
1068
1069         return count;
1070 }
1071
1072 static int acpi_thermal_add_fs(struct acpi_device *device)
1073 {
1074         struct proc_dir_entry *entry = NULL;
1075
1076
1077         if (!acpi_device_dir(device)) {
1078                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1079                                                      acpi_thermal_dir);
1080                 if (!acpi_device_dir(device))
1081                         return -ENODEV;
1082                 acpi_device_dir(device)->owner = THIS_MODULE;
1083         }
1084
1085         /* 'state' [R] */
1086         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1087                                   S_IRUGO, acpi_device_dir(device));
1088         if (!entry)
1089                 return -ENODEV;
1090         else {
1091                 entry->proc_fops = &acpi_thermal_state_fops;
1092                 entry->data = acpi_driver_data(device);
1093                 entry->owner = THIS_MODULE;
1094         }
1095
1096         /* 'temperature' [R] */
1097         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1098                                   S_IRUGO, acpi_device_dir(device));
1099         if (!entry)
1100                 return -ENODEV;
1101         else {
1102                 entry->proc_fops = &acpi_thermal_temp_fops;
1103                 entry->data = acpi_driver_data(device);
1104                 entry->owner = THIS_MODULE;
1105         }
1106
1107         /* 'trip_points' [R] */
1108         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1109                                   S_IRUGO,
1110                                   acpi_device_dir(device));
1111         if (!entry)
1112                 return -ENODEV;
1113         else {
1114                 entry->proc_fops = &acpi_thermal_trip_fops;
1115                 entry->data = acpi_driver_data(device);
1116                 entry->owner = THIS_MODULE;
1117         }
1118
1119         /* 'cooling_mode' [R/W] */
1120         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1121                                   S_IFREG | S_IRUGO | S_IWUSR,
1122                                   acpi_device_dir(device));
1123         if (!entry)
1124                 return -ENODEV;
1125         else {
1126                 entry->proc_fops = &acpi_thermal_cooling_fops;
1127                 entry->data = acpi_driver_data(device);
1128                 entry->owner = THIS_MODULE;
1129         }
1130
1131         /* 'polling_frequency' [R/W] */
1132         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1133                                   S_IFREG | S_IRUGO | S_IWUSR,
1134                                   acpi_device_dir(device));
1135         if (!entry)
1136                 return -ENODEV;
1137         else {
1138                 entry->proc_fops = &acpi_thermal_polling_fops;
1139                 entry->data = acpi_driver_data(device);
1140                 entry->owner = THIS_MODULE;
1141         }
1142
1143         return 0;
1144 }
1145
1146 static int acpi_thermal_remove_fs(struct acpi_device *device)
1147 {
1148
1149         if (acpi_device_dir(device)) {
1150                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1151                                   acpi_device_dir(device));
1152                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1153                                   acpi_device_dir(device));
1154                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1155                                   acpi_device_dir(device));
1156                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1157                                   acpi_device_dir(device));
1158                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1159                                   acpi_device_dir(device));
1160                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1161                 acpi_device_dir(device) = NULL;
1162         }
1163
1164         return 0;
1165 }
1166
1167 /* --------------------------------------------------------------------------
1168                                  Driver Interface
1169    -------------------------------------------------------------------------- */
1170
1171 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1172 {
1173         struct acpi_thermal *tz = data;
1174         struct acpi_device *device = NULL;
1175
1176
1177         if (!tz)
1178                 return;
1179
1180         device = tz->device;
1181
1182         switch (event) {
1183         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1184                 acpi_thermal_check(tz);
1185                 break;
1186         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1187                 acpi_thermal_get_trip_points(tz);
1188                 acpi_thermal_check(tz);
1189                 acpi_bus_generate_proc_event(device, event, 0);
1190                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1191                                                   device->dev.bus_id, event, 0);
1192                 break;
1193         case ACPI_THERMAL_NOTIFY_DEVICES:
1194                 if (tz->flags.devices)
1195                         acpi_thermal_get_devices(tz);
1196                 acpi_bus_generate_proc_event(device, event, 0);
1197                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1198                                                   device->dev.bus_id, event, 0);
1199                 break;
1200         default:
1201                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1202                                   "Unsupported event [0x%x]\n", event));
1203                 break;
1204         }
1205
1206         return;
1207 }
1208
1209 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1210 {
1211         int result = 0;
1212
1213
1214         if (!tz)
1215                 return -EINVAL;
1216
1217         /* Get temperature [_TMP] (required) */
1218         result = acpi_thermal_get_temperature(tz);
1219         if (result)
1220                 return result;
1221
1222         /* Get trip points [_CRT, _PSV, etc.] (required) */
1223         result = acpi_thermal_get_trip_points(tz);
1224         if (result)
1225                 return result;
1226
1227         /* Set the cooling mode [_SCP] to active cooling (default) */
1228         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1229         if (!result)
1230                 tz->flags.cooling_mode = 1;
1231
1232         /* Get default polling frequency [_TZP] (optional) */
1233         if (tzp)
1234                 tz->polling_frequency = tzp;
1235         else
1236                 acpi_thermal_get_polling_frequency(tz);
1237
1238         /* Get devices in this thermal zone [_TZD] (optional) */
1239         result = acpi_thermal_get_devices(tz);
1240         if (!result)
1241                 tz->flags.devices = 1;
1242
1243         return 0;
1244 }
1245
1246 static int acpi_thermal_add(struct acpi_device *device)
1247 {
1248         int result = 0;
1249         acpi_status status = AE_OK;
1250         struct acpi_thermal *tz = NULL;
1251
1252
1253         if (!device)
1254                 return -EINVAL;
1255
1256         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1257         if (!tz)
1258                 return -ENOMEM;
1259
1260         tz->device = device;
1261         strcpy(tz->name, device->pnp.bus_id);
1262         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1263         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1264         acpi_driver_data(device) = tz;
1265         mutex_init(&tz->lock);
1266         result = acpi_thermal_get_info(tz);
1267         if (result)
1268                 goto end;
1269
1270         result = acpi_thermal_add_fs(device);
1271         if (result)
1272                 goto end;
1273
1274         init_timer(&tz->timer);
1275
1276         acpi_thermal_check(tz);
1277
1278         status = acpi_install_notify_handler(device->handle,
1279                                              ACPI_DEVICE_NOTIFY,
1280                                              acpi_thermal_notify, tz);
1281         if (ACPI_FAILURE(status)) {
1282                 result = -ENODEV;
1283                 goto end;
1284         }
1285
1286         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1287                acpi_device_name(device), acpi_device_bid(device),
1288                KELVIN_TO_CELSIUS(tz->temperature));
1289
1290       end:
1291         if (result) {
1292                 acpi_thermal_remove_fs(device);
1293                 kfree(tz);
1294         }
1295
1296         return result;
1297 }
1298
1299 static int acpi_thermal_remove(struct acpi_device *device, int type)
1300 {
1301         acpi_status status = AE_OK;
1302         struct acpi_thermal *tz = NULL;
1303
1304
1305         if (!device || !acpi_driver_data(device))
1306                 return -EINVAL;
1307
1308         tz = acpi_driver_data(device);
1309
1310         /* avoid timer adding new defer task */
1311         tz->zombie = 1;
1312         /* wait for running timer (on other CPUs) finish */
1313         del_timer_sync(&(tz->timer));
1314         /* synchronize deferred task */
1315         acpi_os_wait_events_complete(NULL);
1316         /* deferred task may reinsert timer */
1317         del_timer_sync(&(tz->timer));
1318
1319         status = acpi_remove_notify_handler(device->handle,
1320                                             ACPI_DEVICE_NOTIFY,
1321                                             acpi_thermal_notify);
1322
1323         /* Terminate policy */
1324         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1325                 tz->trips.passive.flags.enabled = 0;
1326                 acpi_thermal_passive(tz);
1327         }
1328         if (tz->trips.active[0].flags.valid
1329             && tz->trips.active[0].flags.enabled) {
1330                 tz->trips.active[0].flags.enabled = 0;
1331                 acpi_thermal_active(tz);
1332         }
1333
1334         acpi_thermal_remove_fs(device);
1335         mutex_destroy(&tz->lock);
1336         kfree(tz);
1337         return 0;
1338 }
1339
1340 static int acpi_thermal_resume(struct acpi_device *device)
1341 {
1342         struct acpi_thermal *tz = NULL;
1343         int i, j, power_state, result;
1344
1345
1346         if (!device || !acpi_driver_data(device))
1347                 return -EINVAL;
1348
1349         tz = acpi_driver_data(device);
1350
1351         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1352                 if (!(&tz->trips.active[i]))
1353                         break;
1354                 if (!tz->trips.active[i].flags.valid)
1355                         break;
1356                 tz->trips.active[i].flags.enabled = 1;
1357                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1358                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1359                             handles[j], &power_state);
1360                         if (result || (power_state != ACPI_STATE_D0)) {
1361                                 tz->trips.active[i].flags.enabled = 0;
1362                                 break;
1363                         }
1364                 }
1365                 tz->state.active |= tz->trips.active[i].flags.enabled;
1366         }
1367
1368         acpi_thermal_check(tz);
1369
1370         return AE_OK;
1371 }
1372
1373 #ifdef CONFIG_DMI
1374 static int thermal_act(const struct dmi_system_id *d) {
1375
1376         if (act == 0) {
1377                 printk(KERN_NOTICE "ACPI: %s detected: "
1378                         "disabling all active thermal trip points\n", d->ident);
1379                 act = -1;
1380         }
1381         return 0;
1382 }
1383 static int thermal_nocrt(const struct dmi_system_id *d) {
1384
1385         printk(KERN_NOTICE "ACPI: %s detected: "
1386                 "disabling all critical thermal trip point actions.\n", d->ident);
1387         nocrt = 1;
1388         return 0;
1389 }
1390 static int thermal_tzp(const struct dmi_system_id *d) {
1391
1392         if (tzp == 0) {
1393                 printk(KERN_NOTICE "ACPI: %s detected: "
1394                         "enabling thermal zone polling\n", d->ident);
1395                 tzp = 300;      /* 300 dS = 30 Seconds */
1396         }
1397         return 0;
1398 }
1399 static int thermal_psv(const struct dmi_system_id *d) {
1400
1401         if (psv == 0) {
1402                 printk(KERN_NOTICE "ACPI: %s detected: "
1403                         "disabling all passive thermal trip points\n", d->ident);
1404                 psv = -1;
1405         }
1406         return 0;
1407 }
1408
1409 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1410         /*
1411          * Award BIOS on this AOpen makes thermal control almost worthless.
1412          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1413          */
1414         {
1415          .callback = thermal_act,
1416          .ident = "AOpen i915GMm-HFS",
1417          .matches = {
1418                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1419                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1420                 },
1421         },
1422         {
1423          .callback = thermal_psv,
1424          .ident = "AOpen i915GMm-HFS",
1425          .matches = {
1426                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1427                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1428                 },
1429         },
1430         {
1431          .callback = thermal_tzp,
1432          .ident = "AOpen i915GMm-HFS",
1433          .matches = {
1434                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1435                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1436                 },
1437         },
1438         {
1439          .callback = thermal_nocrt,
1440          .ident = "Gigabyte GA-7ZX",
1441          .matches = {
1442                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1443                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1444                 },
1445         },
1446         {}
1447 };
1448 #endif /* CONFIG_DMI */
1449
1450 static int __init acpi_thermal_init(void)
1451 {
1452         int result = 0;
1453
1454         dmi_check_system(thermal_dmi_table);
1455
1456         if (off) {
1457                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1458                 return -ENODEV;
1459         }
1460         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1461         if (!acpi_thermal_dir)
1462                 return -ENODEV;
1463         acpi_thermal_dir->owner = THIS_MODULE;
1464
1465         result = acpi_bus_register_driver(&acpi_thermal_driver);
1466         if (result < 0) {
1467                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1468                 return -ENODEV;
1469         }
1470
1471         return 0;
1472 }
1473
1474 static void __exit acpi_thermal_exit(void)
1475 {
1476
1477         acpi_bus_unregister_driver(&acpi_thermal_driver);
1478
1479         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1480
1481         return;
1482 }
1483
1484 module_init(acpi_thermal_init);
1485 module_exit(acpi_thermal_exit);