986afd470a148fabd84911a0e65bd44184f11295
[linux-2.6.git] / drivers / acpi / thermal.c
1 /*
2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
3  *
4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or (at
12  *  your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful, but
15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  *  General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License along
20  *  with this program; if not, write to the Free Software Foundation, Inc.,
21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  *
25  *  This driver fully implements the ACPI thermal policy as described in the
26  *  ACPI 2.0 Specification.
27  *
28  *  TBD: 1. Implement passive cooling hysteresis.
29  *       2. Enhance passive cooling (CPU) states/limit interface to support
30  *          concepts of 'multiple limiters', upper/lower limits, etc.
31  *
32  */
33
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/types.h>
38 #include <linux/proc_fs.h>
39 #include <linux/timer.h>
40 #include <linux/jiffies.h>
41 #include <linux/kmod.h>
42 #include <linux/seq_file.h>
43 #include <asm/uaccess.h>
44
45 #include <acpi/acpi_bus.h>
46 #include <acpi/acpi_drivers.h>
47
48 #define ACPI_THERMAL_COMPONENT          0x04000000
49 #define ACPI_THERMAL_CLASS              "thermal_zone"
50 #define ACPI_THERMAL_DRIVER_NAME        "ACPI Thermal Zone Driver"
51 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
52 #define ACPI_THERMAL_FILE_STATE         "state"
53 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
54 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
55 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
56 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
57 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
58 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
59 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
60 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
61 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
62 #define ACPI_THERMAL_MODE_ACTIVE        0x00
63 #define ACPI_THERMAL_MODE_PASSIVE       0x01
64 #define ACPI_THERMAL_MODE_CRITICAL      0xff
65 #define ACPI_THERMAL_PATH_POWEROFF      "/sbin/poweroff"
66
67 #define ACPI_THERMAL_MAX_ACTIVE 10
68 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
69
70 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
71 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
72
73 #define _COMPONENT              ACPI_THERMAL_COMPONENT
74 ACPI_MODULE_NAME("acpi_thermal")
75
76 MODULE_AUTHOR("Paul Diefenbaugh");
77 MODULE_DESCRIPTION(ACPI_THERMAL_DRIVER_NAME);
78 MODULE_LICENSE("GPL");
79
80 static int tzp;
81 module_param(tzp, int, 0);
82 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
83
84 static int acpi_thermal_add(struct acpi_device *device);
85 static int acpi_thermal_remove(struct acpi_device *device, int type);
86 static int acpi_thermal_resume(struct acpi_device *device);
87 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
88 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
89 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
90 static ssize_t acpi_thermal_write_trip_points(struct file *,
91                                               const char __user *, size_t,
92                                               loff_t *);
93 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
94 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
95                                                const char __user *, size_t,
96                                                loff_t *);
97 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
98 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
99                                           size_t, loff_t *);
100
101 static struct acpi_driver acpi_thermal_driver = {
102         .name = ACPI_THERMAL_DRIVER_NAME,
103         .class = ACPI_THERMAL_CLASS,
104         .ids = ACPI_THERMAL_HID,
105         .ops = {
106                 .add = acpi_thermal_add,
107                 .remove = acpi_thermal_remove,
108                 .resume = acpi_thermal_resume,
109                 },
110 };
111
112 struct acpi_thermal_state {
113         u8 critical:1;
114         u8 hot:1;
115         u8 passive:1;
116         u8 active:1;
117         u8 reserved:4;
118         int active_index;
119 };
120
121 struct acpi_thermal_state_flags {
122         u8 valid:1;
123         u8 enabled:1;
124         u8 reserved:6;
125 };
126
127 struct acpi_thermal_critical {
128         struct acpi_thermal_state_flags flags;
129         unsigned long temperature;
130 };
131
132 struct acpi_thermal_hot {
133         struct acpi_thermal_state_flags flags;
134         unsigned long temperature;
135 };
136
137 struct acpi_thermal_passive {
138         struct acpi_thermal_state_flags flags;
139         unsigned long temperature;
140         unsigned long tc1;
141         unsigned long tc2;
142         unsigned long tsp;
143         struct acpi_handle_list devices;
144 };
145
146 struct acpi_thermal_active {
147         struct acpi_thermal_state_flags flags;
148         unsigned long temperature;
149         struct acpi_handle_list devices;
150 };
151
152 struct acpi_thermal_trips {
153         struct acpi_thermal_critical critical;
154         struct acpi_thermal_hot hot;
155         struct acpi_thermal_passive passive;
156         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
157 };
158
159 struct acpi_thermal_flags {
160         u8 cooling_mode:1;      /* _SCP */
161         u8 devices:1;           /* _TZD */
162         u8 reserved:6;
163 };
164
165 struct acpi_thermal {
166         struct acpi_device * device;
167         acpi_bus_id name;
168         unsigned long temperature;
169         unsigned long last_temperature;
170         unsigned long polling_frequency;
171         u8 cooling_mode;
172         volatile u8 zombie;
173         struct acpi_thermal_flags flags;
174         struct acpi_thermal_state state;
175         struct acpi_thermal_trips trips;
176         struct acpi_handle_list devices;
177         struct timer_list timer;
178 };
179
180 static const struct file_operations acpi_thermal_state_fops = {
181         .open = acpi_thermal_state_open_fs,
182         .read = seq_read,
183         .llseek = seq_lseek,
184         .release = single_release,
185 };
186
187 static const struct file_operations acpi_thermal_temp_fops = {
188         .open = acpi_thermal_temp_open_fs,
189         .read = seq_read,
190         .llseek = seq_lseek,
191         .release = single_release,
192 };
193
194 static const struct file_operations acpi_thermal_trip_fops = {
195         .open = acpi_thermal_trip_open_fs,
196         .read = seq_read,
197         .write = acpi_thermal_write_trip_points,
198         .llseek = seq_lseek,
199         .release = single_release,
200 };
201
202 static const struct file_operations acpi_thermal_cooling_fops = {
203         .open = acpi_thermal_cooling_open_fs,
204         .read = seq_read,
205         .write = acpi_thermal_write_cooling_mode,
206         .llseek = seq_lseek,
207         .release = single_release,
208 };
209
210 static const struct file_operations acpi_thermal_polling_fops = {
211         .open = acpi_thermal_polling_open_fs,
212         .read = seq_read,
213         .write = acpi_thermal_write_polling,
214         .llseek = seq_lseek,
215         .release = single_release,
216 };
217
218 /* --------------------------------------------------------------------------
219                              Thermal Zone Management
220    -------------------------------------------------------------------------- */
221
222 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
223 {
224         acpi_status status = AE_OK;
225
226
227         if (!tz)
228                 return -EINVAL;
229
230         tz->last_temperature = tz->temperature;
231
232         status =
233             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
234         if (ACPI_FAILURE(status))
235                 return -ENODEV;
236
237         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
238                           tz->temperature));
239
240         return 0;
241 }
242
243 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
244 {
245         acpi_status status = AE_OK;
246
247
248         if (!tz)
249                 return -EINVAL;
250
251         status =
252             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
253                                   &tz->polling_frequency);
254         if (ACPI_FAILURE(status))
255                 return -ENODEV;
256
257         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
258                           tz->polling_frequency));
259
260         return 0;
261 }
262
263 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
264 {
265
266         if (!tz)
267                 return -EINVAL;
268
269         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
270
271         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
272                           "Polling frequency set to %lu seconds\n",
273                           tz->polling_frequency));
274
275         return 0;
276 }
277
278 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
279 {
280         acpi_status status = AE_OK;
281         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
282         struct acpi_object_list arg_list = { 1, &arg0 };
283         acpi_handle handle = NULL;
284
285
286         if (!tz)
287                 return -EINVAL;
288
289         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
290         if (ACPI_FAILURE(status)) {
291                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
292                 return -ENODEV;
293         }
294
295         arg0.integer.value = mode;
296
297         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
298         if (ACPI_FAILURE(status))
299                 return -ENODEV;
300
301         tz->cooling_mode = mode;
302
303         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
304                           mode ? "passive" : "active"));
305
306         return 0;
307 }
308
309 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
310 {
311         acpi_status status = AE_OK;
312         int i = 0;
313
314
315         if (!tz)
316                 return -EINVAL;
317
318         /* Critical Shutdown (required) */
319
320         status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
321                                        &tz->trips.critical.temperature);
322         if (ACPI_FAILURE(status)) {
323                 tz->trips.critical.flags.valid = 0;
324                 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
325                 return -ENODEV;
326         } else {
327                 tz->trips.critical.flags.valid = 1;
328                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
329                                   "Found critical threshold [%lu]\n",
330                                   tz->trips.critical.temperature));
331         }
332
333         /* Critical Sleep (optional) */
334
335         status =
336             acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
337                                   &tz->trips.hot.temperature);
338         if (ACPI_FAILURE(status)) {
339                 tz->trips.hot.flags.valid = 0;
340                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
341         } else {
342                 tz->trips.hot.flags.valid = 1;
343                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
344                                   tz->trips.hot.temperature));
345         }
346
347         /* Passive: Processors (optional) */
348
349         status =
350             acpi_evaluate_integer(tz->device->handle, "_PSV", NULL,
351                                   &tz->trips.passive.temperature);
352         if (ACPI_FAILURE(status)) {
353                 tz->trips.passive.flags.valid = 0;
354                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
355         } else {
356                 tz->trips.passive.flags.valid = 1;
357
358                 status =
359                     acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
360                                           &tz->trips.passive.tc1);
361                 if (ACPI_FAILURE(status))
362                         tz->trips.passive.flags.valid = 0;
363
364                 status =
365                     acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
366                                           &tz->trips.passive.tc2);
367                 if (ACPI_FAILURE(status))
368                         tz->trips.passive.flags.valid = 0;
369
370                 status =
371                     acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
372                                           &tz->trips.passive.tsp);
373                 if (ACPI_FAILURE(status))
374                         tz->trips.passive.flags.valid = 0;
375
376                 status =
377                     acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
378                                             &tz->trips.passive.devices);
379                 if (ACPI_FAILURE(status))
380                         tz->trips.passive.flags.valid = 0;
381
382                 if (!tz->trips.passive.flags.valid)
383                         printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
384                 else
385                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
386                                           "Found passive threshold [%lu]\n",
387                                           tz->trips.passive.temperature));
388         }
389
390         /* Active: Fans, etc. (optional) */
391
392         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
393
394                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
395
396                 status =
397                     acpi_evaluate_integer(tz->device->handle, name, NULL,
398                                           &tz->trips.active[i].temperature);
399                 if (ACPI_FAILURE(status))
400                         break;
401
402                 name[2] = 'L';
403                 status =
404                     acpi_evaluate_reference(tz->device->handle, name, NULL,
405                                             &tz->trips.active[i].devices);
406                 if (ACPI_SUCCESS(status)) {
407                         tz->trips.active[i].flags.valid = 1;
408                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
409                                           "Found active threshold [%d]:[%lu]\n",
410                                           i, tz->trips.active[i].temperature));
411                 } else
412                         ACPI_EXCEPTION((AE_INFO, status,
413                                         "Invalid active threshold [%d]", i));
414         }
415
416         return 0;
417 }
418
419 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
420 {
421         acpi_status status = AE_OK;
422
423
424         if (!tz)
425                 return -EINVAL;
426
427         status =
428             acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
429         if (ACPI_FAILURE(status))
430                 return -ENODEV;
431
432         return 0;
433 }
434
435 static int acpi_thermal_call_usermode(char *path)
436 {
437         char *argv[2] = { NULL, NULL };
438         char *envp[3] = { NULL, NULL, NULL };
439
440
441         if (!path)
442                 return -EINVAL;
443
444         argv[0] = path;
445
446         /* minimal command environment */
447         envp[0] = "HOME=/";
448         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
449
450         call_usermodehelper(argv[0], argv, envp, 0);
451
452         return 0;
453 }
454
455 static int acpi_thermal_critical(struct acpi_thermal *tz)
456 {
457         if (!tz || !tz->trips.critical.flags.valid)
458                 return -EINVAL;
459
460         if (tz->temperature >= tz->trips.critical.temperature) {
461                 printk(KERN_WARNING PREFIX "Critical trip point\n");
462                 tz->trips.critical.flags.enabled = 1;
463         } else if (tz->trips.critical.flags.enabled)
464                 tz->trips.critical.flags.enabled = 0;
465
466         printk(KERN_EMERG
467                "Critical temperature reached (%ld C), shutting down.\n",
468                KELVIN_TO_CELSIUS(tz->temperature));
469         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
470                                 tz->trips.critical.flags.enabled);
471
472         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
473
474         return 0;
475 }
476
477 static int acpi_thermal_hot(struct acpi_thermal *tz)
478 {
479         if (!tz || !tz->trips.hot.flags.valid)
480                 return -EINVAL;
481
482         if (tz->temperature >= tz->trips.hot.temperature) {
483                 printk(KERN_WARNING PREFIX "Hot trip point\n");
484                 tz->trips.hot.flags.enabled = 1;
485         } else if (tz->trips.hot.flags.enabled)
486                 tz->trips.hot.flags.enabled = 0;
487
488         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
489                                 tz->trips.hot.flags.enabled);
490
491         /* TBD: Call user-mode "sleep(S4)" function */
492
493         return 0;
494 }
495
496 static void acpi_thermal_passive(struct acpi_thermal *tz)
497 {
498         int result = 1;
499         struct acpi_thermal_passive *passive = NULL;
500         int trend = 0;
501         int i = 0;
502
503
504         if (!tz || !tz->trips.passive.flags.valid)
505                 return;
506
507         passive = &(tz->trips.passive);
508
509         /*
510          * Above Trip?
511          * -----------
512          * Calculate the thermal trend (using the passive cooling equation)
513          * and modify the performance limit for all passive cooling devices
514          * accordingly.  Note that we assume symmetry.
515          */
516         if (tz->temperature >= passive->temperature) {
517                 trend =
518                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
519                     (passive->tc2 * (tz->temperature - passive->temperature));
520                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
521                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
522                                   trend, passive->tc1, tz->temperature,
523                                   tz->last_temperature, passive->tc2,
524                                   tz->temperature, passive->temperature));
525                 passive->flags.enabled = 1;
526                 /* Heating up? */
527                 if (trend > 0)
528                         for (i = 0; i < passive->devices.count; i++)
529                                 acpi_processor_set_thermal_limit(passive->
530                                                                  devices.
531                                                                  handles[i],
532                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
533                 /* Cooling off? */
534                 else if (trend < 0) {
535                         for (i = 0; i < passive->devices.count; i++)
536                                 /*
537                                  * assume that we are on highest
538                                  * freq/lowest thrott and can leave
539                                  * passive mode, even in error case
540                                  */
541                                 if (!acpi_processor_set_thermal_limit
542                                     (passive->devices.handles[i],
543                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
544                                         result = 0;
545                         /*
546                          * Leave cooling mode, even if the temp might
547                          * higher than trip point This is because some
548                          * machines might have long thermal polling
549                          * frequencies (tsp) defined. We will fall back
550                          * into passive mode in next cycle (probably quicker)
551                          */
552                         if (result) {
553                                 passive->flags.enabled = 0;
554                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
555                                                   "Disabling passive cooling, still above threshold,"
556                                                   " but we are cooling down\n"));
557                         }
558                 }
559                 return;
560         }
561
562         /*
563          * Below Trip?
564          * -----------
565          * Implement passive cooling hysteresis to slowly increase performance
566          * and avoid thrashing around the passive trip point.  Note that we
567          * assume symmetry.
568          */
569         if (!passive->flags.enabled)
570                 return;
571         for (i = 0; i < passive->devices.count; i++)
572                 if (!acpi_processor_set_thermal_limit
573                     (passive->devices.handles[i],
574                      ACPI_PROCESSOR_LIMIT_DECREMENT))
575                         result = 0;
576         if (result) {
577                 passive->flags.enabled = 0;
578                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
579                                   "Disabling passive cooling (zone is cool)\n"));
580         }
581 }
582
583 static void acpi_thermal_active(struct acpi_thermal *tz)
584 {
585         int result = 0;
586         struct acpi_thermal_active *active = NULL;
587         int i = 0;
588         int j = 0;
589         unsigned long maxtemp = 0;
590
591
592         if (!tz)
593                 return;
594
595         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
596                 active = &(tz->trips.active[i]);
597                 if (!active || !active->flags.valid)
598                         break;
599                 if (tz->temperature >= active->temperature) {
600                         /*
601                          * Above Threshold?
602                          * ----------------
603                          * If not already enabled, turn ON all cooling devices
604                          * associated with this active threshold.
605                          */
606                         if (active->temperature > maxtemp)
607                                 tz->state.active_index = i;
608                         maxtemp = active->temperature;
609                         if (active->flags.enabled)
610                                 continue;
611                         for (j = 0; j < active->devices.count; j++) {
612                                 result =
613                                     acpi_bus_set_power(active->devices.
614                                                        handles[j],
615                                                        ACPI_STATE_D0);
616                                 if (result) {
617                                         printk(KERN_WARNING PREFIX
618                                                       "Unable to turn cooling device [%p] 'on'\n",
619                                                       active->devices.
620                                                       handles[j]);
621                                         continue;
622                                 }
623                                 active->flags.enabled = 1;
624                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
625                                                   "Cooling device [%p] now 'on'\n",
626                                                   active->devices.handles[j]));
627                         }
628                         continue;
629                 }
630                 if (!active->flags.enabled)
631                         continue;
632                 /*
633                  * Below Threshold?
634                  * ----------------
635                  * Turn OFF all cooling devices associated with this
636                  * threshold.
637                  */
638                 for (j = 0; j < active->devices.count; j++) {
639                         result = acpi_bus_set_power(active->devices.handles[j],
640                                                     ACPI_STATE_D3);
641                         if (result) {
642                                 printk(KERN_WARNING PREFIX
643                                               "Unable to turn cooling device [%p] 'off'\n",
644                                               active->devices.handles[j]);
645                                 continue;
646                         }
647                         active->flags.enabled = 0;
648                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
649                                           "Cooling device [%p] now 'off'\n",
650                                           active->devices.handles[j]));
651                 }
652         }
653 }
654
655 static void acpi_thermal_check(void *context);
656
657 static void acpi_thermal_run(unsigned long data)
658 {
659         struct acpi_thermal *tz = (struct acpi_thermal *)data;
660         if (!tz->zombie)
661                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
662 }
663
664 static void acpi_thermal_check(void *data)
665 {
666         int result = 0;
667         struct acpi_thermal *tz = data;
668         unsigned long sleep_time = 0;
669         int i = 0;
670         struct acpi_thermal_state state;
671
672
673         if (!tz) {
674                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
675                 return;
676         }
677
678         state = tz->state;
679
680         result = acpi_thermal_get_temperature(tz);
681         if (result)
682                 return;
683
684         memset(&tz->state, 0, sizeof(tz->state));
685
686         /*
687          * Check Trip Points
688          * -----------------
689          * Compare the current temperature to the trip point values to see
690          * if we've entered one of the thermal policy states.  Note that
691          * this function determines when a state is entered, but the 
692          * individual policy decides when it is exited (e.g. hysteresis).
693          */
694         if (tz->trips.critical.flags.valid)
695                 state.critical |=
696                     (tz->temperature >= tz->trips.critical.temperature);
697         if (tz->trips.hot.flags.valid)
698                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
699         if (tz->trips.passive.flags.valid)
700                 state.passive |=
701                     (tz->temperature >= tz->trips.passive.temperature);
702         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
703                 if (tz->trips.active[i].flags.valid)
704                         state.active |=
705                             (tz->temperature >=
706                              tz->trips.active[i].temperature);
707
708         /*
709          * Invoke Policy
710          * -------------
711          * Separated from the above check to allow individual policy to 
712          * determine when to exit a given state.
713          */
714         if (state.critical)
715                 acpi_thermal_critical(tz);
716         if (state.hot)
717                 acpi_thermal_hot(tz);
718         if (state.passive)
719                 acpi_thermal_passive(tz);
720         if (state.active)
721                 acpi_thermal_active(tz);
722
723         /*
724          * Calculate State
725          * ---------------
726          * Again, separated from the above two to allow independent policy
727          * decisions.
728          */
729         tz->state.critical = tz->trips.critical.flags.enabled;
730         tz->state.hot = tz->trips.hot.flags.enabled;
731         tz->state.passive = tz->trips.passive.flags.enabled;
732         tz->state.active = 0;
733         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
734                 tz->state.active |= tz->trips.active[i].flags.enabled;
735
736         /*
737          * Calculate Sleep Time
738          * --------------------
739          * If we're in the passive state, use _TSP's value.  Otherwise
740          * use the default polling frequency (e.g. _TZP).  If no polling
741          * frequency is specified then we'll wait forever (at least until
742          * a thermal event occurs).  Note that _TSP and _TZD values are
743          * given in 1/10th seconds (we must covert to milliseconds).
744          */
745         if (tz->state.passive)
746                 sleep_time = tz->trips.passive.tsp * 100;
747         else if (tz->polling_frequency > 0)
748                 sleep_time = tz->polling_frequency * 100;
749
750         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
751                           tz->name, tz->temperature, sleep_time));
752
753         /*
754          * Schedule Next Poll
755          * ------------------
756          */
757         if (!sleep_time) {
758                 if (timer_pending(&(tz->timer)))
759                         del_timer(&(tz->timer));
760         } else {
761                 if (timer_pending(&(tz->timer)))
762                         mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
763                 else {
764                         tz->timer.data = (unsigned long)tz;
765                         tz->timer.function = acpi_thermal_run;
766                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
767                         add_timer(&(tz->timer));
768                 }
769         }
770
771         return;
772 }
773
774 /* --------------------------------------------------------------------------
775                               FS Interface (/proc)
776    -------------------------------------------------------------------------- */
777
778 static struct proc_dir_entry *acpi_thermal_dir;
779
780 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
781 {
782         struct acpi_thermal *tz = seq->private;
783
784
785         if (!tz)
786                 goto end;
787
788         seq_puts(seq, "state:                   ");
789
790         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
791             && !tz->state.active)
792                 seq_puts(seq, "ok\n");
793         else {
794                 if (tz->state.critical)
795                         seq_puts(seq, "critical ");
796                 if (tz->state.hot)
797                         seq_puts(seq, "hot ");
798                 if (tz->state.passive)
799                         seq_puts(seq, "passive ");
800                 if (tz->state.active)
801                         seq_printf(seq, "active[%d]", tz->state.active_index);
802                 seq_puts(seq, "\n");
803         }
804
805       end:
806         return 0;
807 }
808
809 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
810 {
811         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
812 }
813
814 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
815 {
816         int result = 0;
817         struct acpi_thermal *tz = seq->private;
818
819
820         if (!tz)
821                 goto end;
822
823         result = acpi_thermal_get_temperature(tz);
824         if (result)
825                 goto end;
826
827         seq_printf(seq, "temperature:             %ld C\n",
828                    KELVIN_TO_CELSIUS(tz->temperature));
829
830       end:
831         return 0;
832 }
833
834 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
835 {
836         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
837 }
838
839 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
840 {
841         struct acpi_thermal *tz = seq->private;
842         int i = 0;
843         int j = 0;
844
845
846         if (!tz)
847                 goto end;
848
849         if (tz->trips.critical.flags.valid)
850                 seq_printf(seq, "critical (S5):           %ld C\n",
851                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
852
853         if (tz->trips.hot.flags.valid)
854                 seq_printf(seq, "hot (S4):                %ld C\n",
855                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
856
857         if (tz->trips.passive.flags.valid) {
858                 seq_printf(seq,
859                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
860                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
861                            tz->trips.passive.tc1, tz->trips.passive.tc2,
862                            tz->trips.passive.tsp);
863                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
864
865                         seq_printf(seq, "0x%p ",
866                                    tz->trips.passive.devices.handles[j]);
867                 }
868                 seq_puts(seq, "\n");
869         }
870
871         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
872                 if (!(tz->trips.active[i].flags.valid))
873                         break;
874                 seq_printf(seq, "active[%d]:               %ld C: devices=",
875                            i,
876                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
877                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
878                         seq_printf(seq, "0x%p ",
879                                    tz->trips.active[i].devices.handles[j]);
880                 seq_puts(seq, "\n");
881         }
882
883       end:
884         return 0;
885 }
886
887 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
888 {
889         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
890 }
891
892 static ssize_t
893 acpi_thermal_write_trip_points(struct file *file,
894                                const char __user * buffer,
895                                size_t count, loff_t * ppos)
896 {
897         struct seq_file *m = file->private_data;
898         struct acpi_thermal *tz = m->private;
899
900         char *limit_string;
901         int num, critical, hot, passive;
902         int *active;
903         int i = 0;
904
905
906         limit_string = kzalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
907         if (!limit_string)
908                 return -ENOMEM;
909
910         active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
911         if (!active) {
912                 kfree(limit_string);
913                 return -ENOMEM;
914         }
915
916         if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
917                 count = -EINVAL;
918                 goto end;
919         }
920
921         if (copy_from_user(limit_string, buffer, count)) {
922                 count = -EFAULT;
923                 goto end;
924         }
925
926         limit_string[count] = '\0';
927
928         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
929                      &critical, &hot, &passive,
930                      &active[0], &active[1], &active[2], &active[3], &active[4],
931                      &active[5], &active[6], &active[7], &active[8],
932                      &active[9]);
933         if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
934                 count = -EINVAL;
935                 goto end;
936         }
937
938         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
939         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
940         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
941         for (i = 0; i < num - 3; i++) {
942                 if (!(tz->trips.active[i].flags.valid))
943                         break;
944                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
945         }
946
947       end:
948         kfree(active);
949         kfree(limit_string);
950         return count;
951 }
952
953 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
954 {
955         struct acpi_thermal *tz = seq->private;
956
957
958         if (!tz)
959                 goto end;
960
961         if (!tz->flags.cooling_mode) {
962                 seq_puts(seq, "<setting not supported>\n");
963         }
964
965         if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
966                 seq_printf(seq, "cooling mode:  critical\n");
967         else
968                 seq_printf(seq, "cooling mode:  %s\n",
969                            tz->cooling_mode ? "passive" : "active");
970
971       end:
972         return 0;
973 }
974
975 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
976 {
977         return single_open(file, acpi_thermal_cooling_seq_show,
978                            PDE(inode)->data);
979 }
980
981 static ssize_t
982 acpi_thermal_write_cooling_mode(struct file *file,
983                                 const char __user * buffer,
984                                 size_t count, loff_t * ppos)
985 {
986         struct seq_file *m = file->private_data;
987         struct acpi_thermal *tz = m->private;
988         int result = 0;
989         char mode_string[12] = { '\0' };
990
991
992         if (!tz || (count > sizeof(mode_string) - 1))
993                 return -EINVAL;
994
995         if (!tz->flags.cooling_mode)
996                 return -ENODEV;
997
998         if (copy_from_user(mode_string, buffer, count))
999                 return -EFAULT;
1000
1001         mode_string[count] = '\0';
1002
1003         result = acpi_thermal_set_cooling_mode(tz,
1004                                                simple_strtoul(mode_string, NULL,
1005                                                               0));
1006         if (result)
1007                 return result;
1008
1009         acpi_thermal_check(tz);
1010
1011         return count;
1012 }
1013
1014 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1015 {
1016         struct acpi_thermal *tz = seq->private;
1017
1018
1019         if (!tz)
1020                 goto end;
1021
1022         if (!tz->polling_frequency) {
1023                 seq_puts(seq, "<polling disabled>\n");
1024                 goto end;
1025         }
1026
1027         seq_printf(seq, "polling frequency:       %lu seconds\n",
1028                    (tz->polling_frequency / 10));
1029
1030       end:
1031         return 0;
1032 }
1033
1034 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1035 {
1036         return single_open(file, acpi_thermal_polling_seq_show,
1037                            PDE(inode)->data);
1038 }
1039
1040 static ssize_t
1041 acpi_thermal_write_polling(struct file *file,
1042                            const char __user * buffer,
1043                            size_t count, loff_t * ppos)
1044 {
1045         struct seq_file *m = file->private_data;
1046         struct acpi_thermal *tz = m->private;
1047         int result = 0;
1048         char polling_string[12] = { '\0' };
1049         int seconds = 0;
1050
1051
1052         if (!tz || (count > sizeof(polling_string) - 1))
1053                 return -EINVAL;
1054
1055         if (copy_from_user(polling_string, buffer, count))
1056                 return -EFAULT;
1057
1058         polling_string[count] = '\0';
1059
1060         seconds = simple_strtoul(polling_string, NULL, 0);
1061
1062         result = acpi_thermal_set_polling(tz, seconds);
1063         if (result)
1064                 return result;
1065
1066         acpi_thermal_check(tz);
1067
1068         return count;
1069 }
1070
1071 static int acpi_thermal_add_fs(struct acpi_device *device)
1072 {
1073         struct proc_dir_entry *entry = NULL;
1074
1075
1076         if (!acpi_device_dir(device)) {
1077                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1078                                                      acpi_thermal_dir);
1079                 if (!acpi_device_dir(device))
1080                         return -ENODEV;
1081                 acpi_device_dir(device)->owner = THIS_MODULE;
1082         }
1083
1084         /* 'state' [R] */
1085         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1086                                   S_IRUGO, acpi_device_dir(device));
1087         if (!entry)
1088                 return -ENODEV;
1089         else {
1090                 entry->proc_fops = &acpi_thermal_state_fops;
1091                 entry->data = acpi_driver_data(device);
1092                 entry->owner = THIS_MODULE;
1093         }
1094
1095         /* 'temperature' [R] */
1096         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1097                                   S_IRUGO, acpi_device_dir(device));
1098         if (!entry)
1099                 return -ENODEV;
1100         else {
1101                 entry->proc_fops = &acpi_thermal_temp_fops;
1102                 entry->data = acpi_driver_data(device);
1103                 entry->owner = THIS_MODULE;
1104         }
1105
1106         /* 'trip_points' [R/W] */
1107         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1108                                   S_IFREG | S_IRUGO | S_IWUSR,
1109                                   acpi_device_dir(device));
1110         if (!entry)
1111                 return -ENODEV;
1112         else {
1113                 entry->proc_fops = &acpi_thermal_trip_fops;
1114                 entry->data = acpi_driver_data(device);
1115                 entry->owner = THIS_MODULE;
1116         }
1117
1118         /* 'cooling_mode' [R/W] */
1119         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1120                                   S_IFREG | S_IRUGO | S_IWUSR,
1121                                   acpi_device_dir(device));
1122         if (!entry)
1123                 return -ENODEV;
1124         else {
1125                 entry->proc_fops = &acpi_thermal_cooling_fops;
1126                 entry->data = acpi_driver_data(device);
1127                 entry->owner = THIS_MODULE;
1128         }
1129
1130         /* 'polling_frequency' [R/W] */
1131         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1132                                   S_IFREG | S_IRUGO | S_IWUSR,
1133                                   acpi_device_dir(device));
1134         if (!entry)
1135                 return -ENODEV;
1136         else {
1137                 entry->proc_fops = &acpi_thermal_polling_fops;
1138                 entry->data = acpi_driver_data(device);
1139                 entry->owner = THIS_MODULE;
1140         }
1141
1142         return 0;
1143 }
1144
1145 static int acpi_thermal_remove_fs(struct acpi_device *device)
1146 {
1147
1148         if (acpi_device_dir(device)) {
1149                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1150                                   acpi_device_dir(device));
1151                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1152                                   acpi_device_dir(device));
1153                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1154                                   acpi_device_dir(device));
1155                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1156                                   acpi_device_dir(device));
1157                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1158                                   acpi_device_dir(device));
1159                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1160                 acpi_device_dir(device) = NULL;
1161         }
1162
1163         return 0;
1164 }
1165
1166 /* --------------------------------------------------------------------------
1167                                  Driver Interface
1168    -------------------------------------------------------------------------- */
1169
1170 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1171 {
1172         struct acpi_thermal *tz = data;
1173         struct acpi_device *device = NULL;
1174
1175
1176         if (!tz)
1177                 return;
1178
1179         device = tz->device;
1180
1181         switch (event) {
1182         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1183                 acpi_thermal_check(tz);
1184                 break;
1185         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1186                 acpi_thermal_get_trip_points(tz);
1187                 acpi_thermal_check(tz);
1188                 acpi_bus_generate_event(device, event, 0);
1189                 break;
1190         case ACPI_THERMAL_NOTIFY_DEVICES:
1191                 if (tz->flags.devices)
1192                         acpi_thermal_get_devices(tz);
1193                 acpi_bus_generate_event(device, event, 0);
1194                 break;
1195         default:
1196                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1197                                   "Unsupported event [0x%x]\n", event));
1198                 break;
1199         }
1200
1201         return;
1202 }
1203
1204 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1205 {
1206         int result = 0;
1207
1208
1209         if (!tz)
1210                 return -EINVAL;
1211
1212         /* Get temperature [_TMP] (required) */
1213         result = acpi_thermal_get_temperature(tz);
1214         if (result)
1215                 return result;
1216
1217         /* Get trip points [_CRT, _PSV, etc.] (required) */
1218         result = acpi_thermal_get_trip_points(tz);
1219         if (result)
1220                 return result;
1221
1222         /* Set the cooling mode [_SCP] to active cooling (default) */
1223         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1224         if (!result)
1225                 tz->flags.cooling_mode = 1;
1226         else {
1227                 /* Oh,we have not _SCP method.
1228                    Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1229                 tz->flags.cooling_mode = 0;
1230                 if (tz->trips.active[0].flags.valid
1231                     && tz->trips.passive.flags.valid) {
1232                         if (tz->trips.passive.temperature >
1233                             tz->trips.active[0].temperature)
1234                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1235                         else
1236                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1237                 } else if (!tz->trips.active[0].flags.valid
1238                            && tz->trips.passive.flags.valid) {
1239                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1240                 } else if (tz->trips.active[0].flags.valid
1241                            && !tz->trips.passive.flags.valid) {
1242                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1243                 } else {
1244                         /* _ACx and _PSV are optional, but _CRT is required */
1245                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1246                 }
1247         }
1248
1249         /* Get default polling frequency [_TZP] (optional) */
1250         if (tzp)
1251                 tz->polling_frequency = tzp;
1252         else
1253                 acpi_thermal_get_polling_frequency(tz);
1254
1255         /* Get devices in this thermal zone [_TZD] (optional) */
1256         result = acpi_thermal_get_devices(tz);
1257         if (!result)
1258                 tz->flags.devices = 1;
1259
1260         return 0;
1261 }
1262
1263 static int acpi_thermal_add(struct acpi_device *device)
1264 {
1265         int result = 0;
1266         acpi_status status = AE_OK;
1267         struct acpi_thermal *tz = NULL;
1268
1269
1270         if (!device)
1271                 return -EINVAL;
1272
1273         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1274         if (!tz)
1275                 return -ENOMEM;
1276
1277         tz->device = device;
1278         strcpy(tz->name, device->pnp.bus_id);
1279         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1280         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1281         acpi_driver_data(device) = tz;
1282
1283         result = acpi_thermal_get_info(tz);
1284         if (result)
1285                 goto end;
1286
1287         result = acpi_thermal_add_fs(device);
1288         if (result)
1289                 goto end;
1290
1291         init_timer(&tz->timer);
1292
1293         acpi_thermal_check(tz);
1294
1295         status = acpi_install_notify_handler(device->handle,
1296                                              ACPI_DEVICE_NOTIFY,
1297                                              acpi_thermal_notify, tz);
1298         if (ACPI_FAILURE(status)) {
1299                 result = -ENODEV;
1300                 goto end;
1301         }
1302
1303         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1304                acpi_device_name(device), acpi_device_bid(device),
1305                KELVIN_TO_CELSIUS(tz->temperature));
1306
1307       end:
1308         if (result) {
1309                 acpi_thermal_remove_fs(device);
1310                 kfree(tz);
1311         }
1312
1313         return result;
1314 }
1315
1316 static int acpi_thermal_remove(struct acpi_device *device, int type)
1317 {
1318         acpi_status status = AE_OK;
1319         struct acpi_thermal *tz = NULL;
1320
1321
1322         if (!device || !acpi_driver_data(device))
1323                 return -EINVAL;
1324
1325         tz = acpi_driver_data(device);
1326
1327         /* avoid timer adding new defer task */
1328         tz->zombie = 1;
1329         /* wait for running timer (on other CPUs) finish */
1330         del_timer_sync(&(tz->timer));
1331         /* synchronize deferred task */
1332         acpi_os_wait_events_complete(NULL);
1333         /* deferred task may reinsert timer */
1334         del_timer_sync(&(tz->timer));
1335
1336         status = acpi_remove_notify_handler(device->handle,
1337                                             ACPI_DEVICE_NOTIFY,
1338                                             acpi_thermal_notify);
1339
1340         /* Terminate policy */
1341         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1342                 tz->trips.passive.flags.enabled = 0;
1343                 acpi_thermal_passive(tz);
1344         }
1345         if (tz->trips.active[0].flags.valid
1346             && tz->trips.active[0].flags.enabled) {
1347                 tz->trips.active[0].flags.enabled = 0;
1348                 acpi_thermal_active(tz);
1349         }
1350
1351         acpi_thermal_remove_fs(device);
1352
1353         kfree(tz);
1354         return 0;
1355 }
1356
1357 static int acpi_thermal_resume(struct acpi_device *device)
1358 {
1359         struct acpi_thermal *tz = NULL;
1360         int i;
1361
1362         if (!device || !acpi_driver_data(device))
1363                 return -EINVAL;
1364
1365         tz = acpi_driver_data(device);
1366
1367         acpi_thermal_get_temperature(tz);
1368
1369         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1370                 if (tz->trips.active[i].flags.valid) {
1371                         tz->temperature = tz->trips.active[i].temperature;
1372                         tz->trips.active[i].flags.enabled = 0;
1373
1374                         acpi_thermal_active(tz);
1375
1376                         tz->state.active |= tz->trips.active[i].flags.enabled;
1377                         tz->state.active_index = i;
1378                 }
1379         }
1380
1381         acpi_thermal_check(tz);
1382
1383         return AE_OK;
1384 }
1385
1386 static int __init acpi_thermal_init(void)
1387 {
1388         int result = 0;
1389
1390
1391         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1392         if (!acpi_thermal_dir)
1393                 return -ENODEV;
1394         acpi_thermal_dir->owner = THIS_MODULE;
1395
1396         result = acpi_bus_register_driver(&acpi_thermal_driver);
1397         if (result < 0) {
1398                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1399                 return -ENODEV;
1400         }
1401
1402         return 0;
1403 }
1404
1405 static void __exit acpi_thermal_exit(void)
1406 {
1407
1408         acpi_bus_unregister_driver(&acpi_thermal_driver);
1409
1410         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1411
1412         return;
1413 }
1414
1415 module_init(acpi_thermal_init);
1416 module_exit(acpi_thermal_exit);