15d5fdc66a96f708c7ebd5199ca2b5cc47efce56
[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 };
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         unsigned long timeout_jiffies = 0;
715         int i = 0;
716         struct acpi_thermal_state state;
717
718
719         if (!tz) {
720                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
721                 return;
722         }
723
724         state = tz->state;
725
726         result = acpi_thermal_get_temperature(tz);
727         if (result)
728                 return;
729
730         memset(&tz->state, 0, sizeof(tz->state));
731
732         /*
733          * Check Trip Points
734          * -----------------
735          * Compare the current temperature to the trip point values to see
736          * if we've entered one of the thermal policy states.  Note that
737          * this function determines when a state is entered, but the 
738          * individual policy decides when it is exited (e.g. hysteresis).
739          */
740         if (tz->trips.critical.flags.valid)
741                 state.critical |=
742                     (tz->temperature >= tz->trips.critical.temperature);
743         if (tz->trips.hot.flags.valid)
744                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
745         if (tz->trips.passive.flags.valid)
746                 state.passive |=
747                     (tz->temperature >= tz->trips.passive.temperature);
748         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
749                 if (tz->trips.active[i].flags.valid)
750                         state.active |=
751                             (tz->temperature >=
752                              tz->trips.active[i].temperature);
753
754         /*
755          * Invoke Policy
756          * -------------
757          * Separated from the above check to allow individual policy to 
758          * determine when to exit a given state.
759          */
760         if (state.critical)
761                 acpi_thermal_critical(tz);
762         if (state.hot)
763                 acpi_thermal_hot(tz);
764         if (state.passive)
765                 acpi_thermal_passive(tz);
766         if (state.active)
767                 acpi_thermal_active(tz);
768
769         /*
770          * Calculate State
771          * ---------------
772          * Again, separated from the above two to allow independent policy
773          * decisions.
774          */
775         tz->state.critical = tz->trips.critical.flags.enabled;
776         tz->state.hot = tz->trips.hot.flags.enabled;
777         tz->state.passive = tz->trips.passive.flags.enabled;
778         tz->state.active = 0;
779         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
780                 tz->state.active |= tz->trips.active[i].flags.enabled;
781
782         /*
783          * Calculate Sleep Time
784          * --------------------
785          * If we're in the passive state, use _TSP's value.  Otherwise
786          * use the default polling frequency (e.g. _TZP).  If no polling
787          * frequency is specified then we'll wait forever (at least until
788          * a thermal event occurs).  Note that _TSP and _TZD values are
789          * given in 1/10th seconds (we must covert to milliseconds).
790          */
791         if (tz->state.passive) {
792                 sleep_time = tz->trips.passive.tsp * 100;
793                 timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
794         } else if (tz->polling_frequency > 0) {
795                 sleep_time = tz->polling_frequency * 100;
796                 timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
797         }
798
799         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
800                           tz->name, tz->temperature, sleep_time));
801
802         /*
803          * Schedule Next Poll
804          * ------------------
805          */
806         if (!sleep_time) {
807                 if (timer_pending(&(tz->timer)))
808                         del_timer(&(tz->timer));
809         } else {
810                 if (timer_pending(&(tz->timer)))
811                         mod_timer(&(tz->timer), timeout_jiffies);
812                 else {
813                         tz->timer.data = (unsigned long)tz;
814                         tz->timer.function = acpi_thermal_run;
815                         tz->timer.expires = timeout_jiffies;
816                         add_timer(&(tz->timer));
817                 }
818         }
819
820         return;
821 }
822
823 /* --------------------------------------------------------------------------
824                               FS Interface (/proc)
825    -------------------------------------------------------------------------- */
826
827 static struct proc_dir_entry *acpi_thermal_dir;
828
829 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
830 {
831         struct acpi_thermal *tz = seq->private;
832
833
834         if (!tz)
835                 goto end;
836
837         seq_puts(seq, "state:                   ");
838
839         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
840             && !tz->state.active)
841                 seq_puts(seq, "ok\n");
842         else {
843                 if (tz->state.critical)
844                         seq_puts(seq, "critical ");
845                 if (tz->state.hot)
846                         seq_puts(seq, "hot ");
847                 if (tz->state.passive)
848                         seq_puts(seq, "passive ");
849                 if (tz->state.active)
850                         seq_printf(seq, "active[%d]", tz->state.active_index);
851                 seq_puts(seq, "\n");
852         }
853
854       end:
855         return 0;
856 }
857
858 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
859 {
860         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
861 }
862
863 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
864 {
865         int result = 0;
866         struct acpi_thermal *tz = seq->private;
867
868
869         if (!tz)
870                 goto end;
871
872         result = acpi_thermal_get_temperature(tz);
873         if (result)
874                 goto end;
875
876         seq_printf(seq, "temperature:             %ld C\n",
877                    KELVIN_TO_CELSIUS(tz->temperature));
878
879       end:
880         return 0;
881 }
882
883 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
884 {
885         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
886 }
887
888 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
889 {
890         struct acpi_thermal *tz = seq->private;
891         struct acpi_device *device;
892         acpi_status status;
893
894         int i = 0;
895         int j = 0;
896
897
898         if (!tz)
899                 goto end;
900
901         if (tz->trips.critical.flags.valid)
902                 seq_printf(seq, "critical (S5):           %ld C%s",
903                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
904                            nocrt ? " <disabled>\n" : "\n");
905
906         if (tz->trips.hot.flags.valid)
907                 seq_printf(seq, "hot (S4):                %ld C%s",
908                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
909                            nocrt ? " <disabled>\n" : "\n");
910
911         if (tz->trips.passive.flags.valid) {
912                 seq_printf(seq,
913                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
914                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
915                            tz->trips.passive.tc1, tz->trips.passive.tc2,
916                            tz->trips.passive.tsp);
917                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
918                         status = acpi_bus_get_device(tz->trips.passive.devices.
919                                                      handles[j], &device);
920                         seq_printf(seq, "%4.4s ", status ? "" :
921                                    acpi_device_bid(device));
922                 }
923                 seq_puts(seq, "\n");
924         }
925
926         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
927                 if (!(tz->trips.active[i].flags.valid))
928                         break;
929                 seq_printf(seq, "active[%d]:               %ld C: devices=",
930                            i,
931                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
932                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
933                         status = acpi_bus_get_device(tz->trips.active[i].
934                                                      devices.handles[j],
935                                                      &device);
936                         seq_printf(seq, "%4.4s ", status ? "" :
937                                    acpi_device_bid(device));
938                 }
939                 seq_puts(seq, "\n");
940         }
941
942       end:
943         return 0;
944 }
945
946 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
947 {
948         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
949 }
950
951 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
952 {
953         struct acpi_thermal *tz = seq->private;
954
955
956         if (!tz)
957                 goto end;
958
959         if (!tz->flags.cooling_mode)
960                 seq_puts(seq, "<setting not supported>\n");
961         else
962                 seq_puts(seq, "0 - Active; 1 - Passive\n");
963
964       end:
965         return 0;
966 }
967
968 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
969 {
970         return single_open(file, acpi_thermal_cooling_seq_show,
971                            PDE(inode)->data);
972 }
973
974 static ssize_t
975 acpi_thermal_write_cooling_mode(struct file *file,
976                                 const char __user * buffer,
977                                 size_t count, loff_t * ppos)
978 {
979         struct seq_file *m = file->private_data;
980         struct acpi_thermal *tz = m->private;
981         int result = 0;
982         char mode_string[12] = { '\0' };
983
984
985         if (!tz || (count > sizeof(mode_string) - 1))
986                 return -EINVAL;
987
988         if (!tz->flags.cooling_mode)
989                 return -ENODEV;
990
991         if (copy_from_user(mode_string, buffer, count))
992                 return -EFAULT;
993
994         mode_string[count] = '\0';
995
996         result = acpi_thermal_set_cooling_mode(tz,
997                                                simple_strtoul(mode_string, NULL,
998                                                               0));
999         if (result)
1000                 return result;
1001
1002         acpi_thermal_check(tz);
1003
1004         return count;
1005 }
1006
1007 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1008 {
1009         struct acpi_thermal *tz = seq->private;
1010
1011
1012         if (!tz)
1013                 goto end;
1014
1015         if (!tz->polling_frequency) {
1016                 seq_puts(seq, "<polling disabled>\n");
1017                 goto end;
1018         }
1019
1020         seq_printf(seq, "polling frequency:       %lu seconds\n",
1021                    (tz->polling_frequency / 10));
1022
1023       end:
1024         return 0;
1025 }
1026
1027 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1028 {
1029         return single_open(file, acpi_thermal_polling_seq_show,
1030                            PDE(inode)->data);
1031 }
1032
1033 static ssize_t
1034 acpi_thermal_write_polling(struct file *file,
1035                            const char __user * buffer,
1036                            size_t count, loff_t * ppos)
1037 {
1038         struct seq_file *m = file->private_data;
1039         struct acpi_thermal *tz = m->private;
1040         int result = 0;
1041         char polling_string[12] = { '\0' };
1042         int seconds = 0;
1043
1044
1045         if (!tz || (count > sizeof(polling_string) - 1))
1046                 return -EINVAL;
1047
1048         if (copy_from_user(polling_string, buffer, count))
1049                 return -EFAULT;
1050
1051         polling_string[count] = '\0';
1052
1053         seconds = simple_strtoul(polling_string, NULL, 0);
1054
1055         result = acpi_thermal_set_polling(tz, seconds);
1056         if (result)
1057                 return result;
1058
1059         acpi_thermal_check(tz);
1060
1061         return count;
1062 }
1063
1064 static int acpi_thermal_add_fs(struct acpi_device *device)
1065 {
1066         struct proc_dir_entry *entry = NULL;
1067
1068
1069         if (!acpi_device_dir(device)) {
1070                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1071                                                      acpi_thermal_dir);
1072                 if (!acpi_device_dir(device))
1073                         return -ENODEV;
1074                 acpi_device_dir(device)->owner = THIS_MODULE;
1075         }
1076
1077         /* 'state' [R] */
1078         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1079                                   S_IRUGO, acpi_device_dir(device));
1080         if (!entry)
1081                 return -ENODEV;
1082         else {
1083                 entry->proc_fops = &acpi_thermal_state_fops;
1084                 entry->data = acpi_driver_data(device);
1085                 entry->owner = THIS_MODULE;
1086         }
1087
1088         /* 'temperature' [R] */
1089         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1090                                   S_IRUGO, acpi_device_dir(device));
1091         if (!entry)
1092                 return -ENODEV;
1093         else {
1094                 entry->proc_fops = &acpi_thermal_temp_fops;
1095                 entry->data = acpi_driver_data(device);
1096                 entry->owner = THIS_MODULE;
1097         }
1098
1099         /* 'trip_points' [R] */
1100         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1101                                   S_IRUGO,
1102                                   acpi_device_dir(device));
1103         if (!entry)
1104                 return -ENODEV;
1105         else {
1106                 entry->proc_fops = &acpi_thermal_trip_fops;
1107                 entry->data = acpi_driver_data(device);
1108                 entry->owner = THIS_MODULE;
1109         }
1110
1111         /* 'cooling_mode' [R/W] */
1112         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1113                                   S_IFREG | S_IRUGO | S_IWUSR,
1114                                   acpi_device_dir(device));
1115         if (!entry)
1116                 return -ENODEV;
1117         else {
1118                 entry->proc_fops = &acpi_thermal_cooling_fops;
1119                 entry->data = acpi_driver_data(device);
1120                 entry->owner = THIS_MODULE;
1121         }
1122
1123         /* 'polling_frequency' [R/W] */
1124         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1125                                   S_IFREG | S_IRUGO | S_IWUSR,
1126                                   acpi_device_dir(device));
1127         if (!entry)
1128                 return -ENODEV;
1129         else {
1130                 entry->proc_fops = &acpi_thermal_polling_fops;
1131                 entry->data = acpi_driver_data(device);
1132                 entry->owner = THIS_MODULE;
1133         }
1134
1135         return 0;
1136 }
1137
1138 static int acpi_thermal_remove_fs(struct acpi_device *device)
1139 {
1140
1141         if (acpi_device_dir(device)) {
1142                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1143                                   acpi_device_dir(device));
1144                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1145                                   acpi_device_dir(device));
1146                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1147                                   acpi_device_dir(device));
1148                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1149                                   acpi_device_dir(device));
1150                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1151                                   acpi_device_dir(device));
1152                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1153                 acpi_device_dir(device) = NULL;
1154         }
1155
1156         return 0;
1157 }
1158
1159 /* --------------------------------------------------------------------------
1160                                  Driver Interface
1161    -------------------------------------------------------------------------- */
1162
1163 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1164 {
1165         struct acpi_thermal *tz = data;
1166         struct acpi_device *device = NULL;
1167
1168
1169         if (!tz)
1170                 return;
1171
1172         device = tz->device;
1173
1174         switch (event) {
1175         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1176                 acpi_thermal_check(tz);
1177                 break;
1178         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1179                 acpi_thermal_get_trip_points(tz);
1180                 acpi_thermal_check(tz);
1181                 acpi_bus_generate_proc_event(device, event, 0);
1182                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1183                                                   device->dev.bus_id, event, 0);
1184                 break;
1185         case ACPI_THERMAL_NOTIFY_DEVICES:
1186                 if (tz->flags.devices)
1187                         acpi_thermal_get_devices(tz);
1188                 acpi_bus_generate_proc_event(device, event, 0);
1189                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1190                                                   device->dev.bus_id, event, 0);
1191                 break;
1192         default:
1193                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1194                                   "Unsupported event [0x%x]\n", event));
1195                 break;
1196         }
1197
1198         return;
1199 }
1200
1201 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1202 {
1203         int result = 0;
1204
1205
1206         if (!tz)
1207                 return -EINVAL;
1208
1209         /* Get temperature [_TMP] (required) */
1210         result = acpi_thermal_get_temperature(tz);
1211         if (result)
1212                 return result;
1213
1214         /* Get trip points [_CRT, _PSV, etc.] (required) */
1215         result = acpi_thermal_get_trip_points(tz);
1216         if (result)
1217                 return result;
1218
1219         /* Set the cooling mode [_SCP] to active cooling (default) */
1220         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1221         if (!result)
1222                 tz->flags.cooling_mode = 1;
1223
1224         /* Get default polling frequency [_TZP] (optional) */
1225         if (tzp)
1226                 tz->polling_frequency = tzp;
1227         else
1228                 acpi_thermal_get_polling_frequency(tz);
1229
1230         /* Get devices in this thermal zone [_TZD] (optional) */
1231         result = acpi_thermal_get_devices(tz);
1232         if (!result)
1233                 tz->flags.devices = 1;
1234
1235         return 0;
1236 }
1237
1238 static int acpi_thermal_add(struct acpi_device *device)
1239 {
1240         int result = 0;
1241         acpi_status status = AE_OK;
1242         struct acpi_thermal *tz = NULL;
1243
1244
1245         if (!device)
1246                 return -EINVAL;
1247
1248         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1249         if (!tz)
1250                 return -ENOMEM;
1251
1252         tz->device = device;
1253         strcpy(tz->name, device->pnp.bus_id);
1254         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1255         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1256         acpi_driver_data(device) = tz;
1257
1258         result = acpi_thermal_get_info(tz);
1259         if (result)
1260                 goto end;
1261
1262         result = acpi_thermal_add_fs(device);
1263         if (result)
1264                 goto end;
1265
1266         init_timer(&tz->timer);
1267
1268         acpi_thermal_check(tz);
1269
1270         status = acpi_install_notify_handler(device->handle,
1271                                              ACPI_DEVICE_NOTIFY,
1272                                              acpi_thermal_notify, tz);
1273         if (ACPI_FAILURE(status)) {
1274                 result = -ENODEV;
1275                 goto end;
1276         }
1277
1278         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1279                acpi_device_name(device), acpi_device_bid(device),
1280                KELVIN_TO_CELSIUS(tz->temperature));
1281
1282       end:
1283         if (result) {
1284                 acpi_thermal_remove_fs(device);
1285                 kfree(tz);
1286         }
1287
1288         return result;
1289 }
1290
1291 static int acpi_thermal_remove(struct acpi_device *device, int type)
1292 {
1293         acpi_status status = AE_OK;
1294         struct acpi_thermal *tz = NULL;
1295
1296
1297         if (!device || !acpi_driver_data(device))
1298                 return -EINVAL;
1299
1300         tz = acpi_driver_data(device);
1301
1302         /* avoid timer adding new defer task */
1303         tz->zombie = 1;
1304         /* wait for running timer (on other CPUs) finish */
1305         del_timer_sync(&(tz->timer));
1306         /* synchronize deferred task */
1307         acpi_os_wait_events_complete(NULL);
1308         /* deferred task may reinsert timer */
1309         del_timer_sync(&(tz->timer));
1310
1311         status = acpi_remove_notify_handler(device->handle,
1312                                             ACPI_DEVICE_NOTIFY,
1313                                             acpi_thermal_notify);
1314
1315         /* Terminate policy */
1316         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1317                 tz->trips.passive.flags.enabled = 0;
1318                 acpi_thermal_passive(tz);
1319         }
1320         if (tz->trips.active[0].flags.valid
1321             && tz->trips.active[0].flags.enabled) {
1322                 tz->trips.active[0].flags.enabled = 0;
1323                 acpi_thermal_active(tz);
1324         }
1325
1326         acpi_thermal_remove_fs(device);
1327
1328         kfree(tz);
1329         return 0;
1330 }
1331
1332 static int acpi_thermal_resume(struct acpi_device *device)
1333 {
1334         struct acpi_thermal *tz = NULL;
1335         int i, j, power_state, result;
1336
1337
1338         if (!device || !acpi_driver_data(device))
1339                 return -EINVAL;
1340
1341         tz = acpi_driver_data(device);
1342
1343         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1344                 if (!(&tz->trips.active[i]))
1345                         break;
1346                 if (!tz->trips.active[i].flags.valid)
1347                         break;
1348                 tz->trips.active[i].flags.enabled = 1;
1349                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1350                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1351                             handles[j], &power_state);
1352                         if (result || (power_state != ACPI_STATE_D0)) {
1353                                 tz->trips.active[i].flags.enabled = 0;
1354                                 break;
1355                         }
1356                 }
1357                 tz->state.active |= tz->trips.active[i].flags.enabled;
1358         }
1359
1360         acpi_thermal_check(tz);
1361
1362         return AE_OK;
1363 }
1364
1365 #ifdef CONFIG_DMI
1366 static int thermal_act(struct dmi_system_id *d) {
1367
1368         if (act == 0) {
1369                 printk(KERN_NOTICE "ACPI: %s detected: "
1370                         "disabling all active thermal trip points\n", d->ident);
1371                 act = -1;
1372         }
1373         return 0;
1374 }
1375 static int thermal_nocrt(struct dmi_system_id *d) {
1376
1377         printk(KERN_NOTICE "ACPI: %s detected: "
1378                 "disabling all critical thermal trip point actions.\n", d->ident);
1379         nocrt = 1;
1380         return 0;
1381 }
1382 static int thermal_tzp(struct dmi_system_id *d) {
1383
1384         if (tzp == 0) {
1385                 printk(KERN_NOTICE "ACPI: %s detected: "
1386                         "enabling thermal zone polling\n", d->ident);
1387                 tzp = 300;      /* 300 dS = 30 Seconds */
1388         }
1389         return 0;
1390 }
1391 static int thermal_psv(struct dmi_system_id *d) {
1392
1393         if (psv == 0) {
1394                 printk(KERN_NOTICE "ACPI: %s detected: "
1395                         "disabling all passive thermal trip points\n", d->ident);
1396                 psv = -1;
1397         }
1398         return 0;
1399 }
1400
1401 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1402         /*
1403          * Award BIOS on this AOpen makes thermal control almost worthless.
1404          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1405          */
1406         {
1407          .callback = thermal_act,
1408          .ident = "AOpen i915GMm-HFS",
1409          .matches = {
1410                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1411                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1412                 },
1413         },
1414         {
1415          .callback = thermal_psv,
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_tzp,
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_nocrt,
1432          .ident = "Gigabyte GA-7ZX",
1433          .matches = {
1434                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1435                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1436                 },
1437         },
1438         {}
1439 };
1440 #endif /* CONFIG_DMI */
1441
1442 static int __init acpi_thermal_init(void)
1443 {
1444         int result = 0;
1445
1446         dmi_check_system(thermal_dmi_table);
1447
1448         if (off) {
1449                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1450                 return -ENODEV;
1451         }
1452         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1453         if (!acpi_thermal_dir)
1454                 return -ENODEV;
1455         acpi_thermal_dir->owner = THIS_MODULE;
1456
1457         result = acpi_bus_register_driver(&acpi_thermal_driver);
1458         if (result < 0) {
1459                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1460                 return -ENODEV;
1461         }
1462
1463         return 0;
1464 }
1465
1466 static void __exit acpi_thermal_exit(void)
1467 {
1468
1469         acpi_bus_unregister_driver(&acpi_thermal_driver);
1470
1471         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1472
1473         return;
1474 }
1475
1476 module_init(acpi_thermal_init);
1477 module_exit(acpi_thermal_exit);