[ACPI] Allow return to active cooling mode once passive mode is entered
[linux-2.6.git] / drivers / acpi / thermal.c
1 /*
2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
3  *
4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or (at
12  *  your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful, but
15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  *  General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License along
20  *  with this program; if not, write to the Free Software Foundation, Inc.,
21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  *
25  *  This driver fully implements the ACPI thermal policy as described in the
26  *  ACPI 2.0 Specification.
27  *
28  *  TBD: 1. Implement passive cooling hysteresis.
29  *       2. Enhance passive cooling (CPU) states/limit interface to support
30  *          concepts of 'multiple limiters', upper/lower limits, etc.
31  *
32  */
33
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/types.h>
38 #include <linux/proc_fs.h>
39 #include <linux/sched.h>
40 #include <linux/kmod.h>
41 #include <linux/seq_file.h>
42 #include <asm/uaccess.h>
43
44 #include <acpi/acpi_bus.h>
45 #include <acpi/acpi_drivers.h>
46
47 #define ACPI_THERMAL_COMPONENT          0x04000000
48 #define ACPI_THERMAL_CLASS              "thermal_zone"
49 #define ACPI_THERMAL_DRIVER_NAME        "ACPI Thermal Zone Driver"
50 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
51 #define ACPI_THERMAL_FILE_STATE         "state"
52 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
53 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
54 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
55 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
56 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
57 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
58 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
59 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
60 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
61 #define ACPI_THERMAL_MODE_ACTIVE        0x00
62 #define ACPI_THERMAL_MODE_PASSIVE       0x01
63 #define ACPI_THERMAL_MODE_CRITICAL      0xff
64 #define ACPI_THERMAL_PATH_POWEROFF      "/sbin/poweroff"
65
66 #define ACPI_THERMAL_MAX_ACTIVE 10
67 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
68
69 #define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
70 #define CELSIUS_TO_KELVIN(t)    ((t+273)*10)
71
72 #define _COMPONENT              ACPI_THERMAL_COMPONENT
73 ACPI_MODULE_NAME("acpi_thermal")
74
75 MODULE_AUTHOR("Paul Diefenbaugh");
76 MODULE_DESCRIPTION(ACPI_THERMAL_DRIVER_NAME);
77 MODULE_LICENSE("GPL");
78
79 static int tzp;
80 module_param(tzp, int, 0);
81 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
82
83 static int acpi_thermal_add(struct acpi_device *device);
84 static int acpi_thermal_remove(struct acpi_device *device, int type);
85 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
86 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
87 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
88 static ssize_t acpi_thermal_write_trip_points(struct file *,
89                                               const char __user *, size_t,
90                                               loff_t *);
91 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
92 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
93                                                const char __user *, size_t,
94                                                loff_t *);
95 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
96 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
97                                           size_t, loff_t *);
98
99 static struct acpi_driver acpi_thermal_driver = {
100         .name = ACPI_THERMAL_DRIVER_NAME,
101         .class = ACPI_THERMAL_CLASS,
102         .ids = ACPI_THERMAL_HID,
103         .ops = {
104                 .add = acpi_thermal_add,
105                 .remove = acpi_thermal_remove,
106                 },
107 };
108
109 struct acpi_thermal_state {
110         u8 critical:1;
111         u8 hot:1;
112         u8 passive:1;
113         u8 active:1;
114         u8 reserved:4;
115         int active_index;
116 };
117
118 struct acpi_thermal_state_flags {
119         u8 valid:1;
120         u8 enabled:1;
121         u8 reserved:6;
122 };
123
124 struct acpi_thermal_critical {
125         struct acpi_thermal_state_flags flags;
126         unsigned long temperature;
127 };
128
129 struct acpi_thermal_hot {
130         struct acpi_thermal_state_flags flags;
131         unsigned long temperature;
132 };
133
134 struct acpi_thermal_passive {
135         struct acpi_thermal_state_flags flags;
136         unsigned long temperature;
137         unsigned long tc1;
138         unsigned long tc2;
139         unsigned long tsp;
140         struct acpi_handle_list devices;
141 };
142
143 struct acpi_thermal_active {
144         struct acpi_thermal_state_flags flags;
145         unsigned long temperature;
146         struct acpi_handle_list devices;
147 };
148
149 struct acpi_thermal_trips {
150         struct acpi_thermal_critical critical;
151         struct acpi_thermal_hot hot;
152         struct acpi_thermal_passive passive;
153         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
154 };
155
156 struct acpi_thermal_flags {
157         u8 cooling_mode:1;      /* _SCP */
158         u8 devices:1;           /* _TZD */
159         u8 reserved:6;
160 };
161
162 struct acpi_thermal {
163         acpi_handle handle;
164         acpi_bus_id name;
165         unsigned long temperature;
166         unsigned long last_temperature;
167         unsigned long polling_frequency;
168         u8 cooling_mode;
169         volatile u8 zombie;
170         struct acpi_thermal_flags flags;
171         struct acpi_thermal_state state;
172         struct acpi_thermal_trips trips;
173         struct acpi_handle_list devices;
174         struct timer_list timer;
175 };
176
177 static struct file_operations acpi_thermal_state_fops = {
178         .open = acpi_thermal_state_open_fs,
179         .read = seq_read,
180         .llseek = seq_lseek,
181         .release = single_release,
182 };
183
184 static struct file_operations acpi_thermal_temp_fops = {
185         .open = acpi_thermal_temp_open_fs,
186         .read = seq_read,
187         .llseek = seq_lseek,
188         .release = single_release,
189 };
190
191 static struct file_operations acpi_thermal_trip_fops = {
192         .open = acpi_thermal_trip_open_fs,
193         .read = seq_read,
194         .write = acpi_thermal_write_trip_points,
195         .llseek = seq_lseek,
196         .release = single_release,
197 };
198
199 static struct file_operations acpi_thermal_cooling_fops = {
200         .open = acpi_thermal_cooling_open_fs,
201         .read = seq_read,
202         .write = acpi_thermal_write_cooling_mode,
203         .llseek = seq_lseek,
204         .release = single_release,
205 };
206
207 static struct file_operations acpi_thermal_polling_fops = {
208         .open = acpi_thermal_polling_open_fs,
209         .read = seq_read,
210         .write = acpi_thermal_write_polling,
211         .llseek = seq_lseek,
212         .release = single_release,
213 };
214
215 /* --------------------------------------------------------------------------
216                              Thermal Zone Management
217    -------------------------------------------------------------------------- */
218
219 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
220 {
221         acpi_status status = AE_OK;
222
223         ACPI_FUNCTION_TRACE("acpi_thermal_get_temperature");
224
225         if (!tz)
226                 return_VALUE(-EINVAL);
227
228         tz->last_temperature = tz->temperature;
229
230         status =
231             acpi_evaluate_integer(tz->handle, "_TMP", NULL, &tz->temperature);
232         if (ACPI_FAILURE(status))
233                 return_VALUE(-ENODEV);
234
235         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
236                           tz->temperature));
237
238         return_VALUE(0);
239 }
240
241 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
242 {
243         acpi_status status = AE_OK;
244
245         ACPI_FUNCTION_TRACE("acpi_thermal_get_polling_frequency");
246
247         if (!tz)
248                 return_VALUE(-EINVAL);
249
250         status =
251             acpi_evaluate_integer(tz->handle, "_TZP", NULL,
252                                   &tz->polling_frequency);
253         if (ACPI_FAILURE(status))
254                 return_VALUE(-ENODEV);
255
256         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
257                           tz->polling_frequency));
258
259         return_VALUE(0);
260 }
261
262 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
263 {
264         ACPI_FUNCTION_TRACE("acpi_thermal_set_polling");
265
266         if (!tz)
267                 return_VALUE(-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_VALUE(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         ACPI_FUNCTION_TRACE("acpi_thermal_set_cooling_mode");
286
287         if (!tz)
288                 return_VALUE(-EINVAL);
289
290         status = acpi_get_handle(tz->handle, "_SCP", &handle);
291         if (ACPI_FAILURE(status)) {
292                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
293                 return_VALUE(-ENODEV);
294         }
295
296         arg0.integer.value = mode;
297
298         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
299         if (ACPI_FAILURE(status))
300                 return_VALUE(-ENODEV);
301
302         tz->cooling_mode = mode;
303
304         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
305                           mode ? "passive" : "active"));
306
307         return_VALUE(0);
308 }
309
310 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
311 {
312         acpi_status status = AE_OK;
313         int i = 0;
314
315         ACPI_FUNCTION_TRACE("acpi_thermal_get_trip_points");
316
317         if (!tz)
318                 return_VALUE(-EINVAL);
319
320         /* Critical Shutdown (required) */
321
322         status = acpi_evaluate_integer(tz->handle, "_CRT", NULL,
323                                        &tz->trips.critical.temperature);
324         if (ACPI_FAILURE(status)) {
325                 tz->trips.critical.flags.valid = 0;
326                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "No critical threshold\n"));
327                 return_VALUE(-ENODEV);
328         } else {
329                 tz->trips.critical.flags.valid = 1;
330                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
331                                   "Found critical threshold [%lu]\n",
332                                   tz->trips.critical.temperature));
333         }
334
335         /* Critical Sleep (optional) */
336
337         status =
338             acpi_evaluate_integer(tz->handle, "_HOT", NULL,
339                                   &tz->trips.hot.temperature);
340         if (ACPI_FAILURE(status)) {
341                 tz->trips.hot.flags.valid = 0;
342                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
343         } else {
344                 tz->trips.hot.flags.valid = 1;
345                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
346                                   tz->trips.hot.temperature));
347         }
348
349         /* Passive: Processors (optional) */
350
351         status =
352             acpi_evaluate_integer(tz->handle, "_PSV", NULL,
353                                   &tz->trips.passive.temperature);
354         if (ACPI_FAILURE(status)) {
355                 tz->trips.passive.flags.valid = 0;
356                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
357         } else {
358                 tz->trips.passive.flags.valid = 1;
359
360                 status =
361                     acpi_evaluate_integer(tz->handle, "_TC1", NULL,
362                                           &tz->trips.passive.tc1);
363                 if (ACPI_FAILURE(status))
364                         tz->trips.passive.flags.valid = 0;
365
366                 status =
367                     acpi_evaluate_integer(tz->handle, "_TC2", NULL,
368                                           &tz->trips.passive.tc2);
369                 if (ACPI_FAILURE(status))
370                         tz->trips.passive.flags.valid = 0;
371
372                 status =
373                     acpi_evaluate_integer(tz->handle, "_TSP", NULL,
374                                           &tz->trips.passive.tsp);
375                 if (ACPI_FAILURE(status))
376                         tz->trips.passive.flags.valid = 0;
377
378                 status =
379                     acpi_evaluate_reference(tz->handle, "_PSL", NULL,
380                                             &tz->trips.passive.devices);
381                 if (ACPI_FAILURE(status))
382                         tz->trips.passive.flags.valid = 0;
383
384                 if (!tz->trips.passive.flags.valid)
385                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
386                                           "Invalid passive threshold\n"));
387                 else
388                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
389                                           "Found passive threshold [%lu]\n",
390                                           tz->trips.passive.temperature));
391         }
392
393         /* Active: Fans, etc. (optional) */
394
395         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
396
397                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
398
399                 status =
400                     acpi_evaluate_integer(tz->handle, name, NULL,
401                                           &tz->trips.active[i].temperature);
402                 if (ACPI_FAILURE(status))
403                         break;
404
405                 name[2] = 'L';
406                 status =
407                     acpi_evaluate_reference(tz->handle, name, NULL,
408                                             &tz->trips.active[i].devices);
409                 if (ACPI_SUCCESS(status)) {
410                         tz->trips.active[i].flags.valid = 1;
411                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
412                                           "Found active threshold [%d]:[%lu]\n",
413                                           i, tz->trips.active[i].temperature));
414                 } else
415                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
416                                           "Invalid active threshold [%d]\n",
417                                           i));
418         }
419
420         return_VALUE(0);
421 }
422
423 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
424 {
425         acpi_status status = AE_OK;
426
427         ACPI_FUNCTION_TRACE("acpi_thermal_get_devices");
428
429         if (!tz)
430                 return_VALUE(-EINVAL);
431
432         status =
433             acpi_evaluate_reference(tz->handle, "_TZD", NULL, &tz->devices);
434         if (ACPI_FAILURE(status))
435                 return_VALUE(-ENODEV);
436
437         return_VALUE(0);
438 }
439
440 static int acpi_thermal_call_usermode(char *path)
441 {
442         char *argv[2] = { NULL, NULL };
443         char *envp[3] = { NULL, NULL, NULL };
444
445         ACPI_FUNCTION_TRACE("acpi_thermal_call_usermode");
446
447         if (!path)
448                 return_VALUE(-EINVAL);
449
450         argv[0] = path;
451
452         /* minimal command environment */
453         envp[0] = "HOME=/";
454         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
455
456         call_usermodehelper(argv[0], argv, envp, 0);
457
458         return_VALUE(0);
459 }
460
461 static int acpi_thermal_critical(struct acpi_thermal *tz)
462 {
463         int result = 0;
464         struct acpi_device *device = NULL;
465
466         ACPI_FUNCTION_TRACE("acpi_thermal_critical");
467
468         if (!tz || !tz->trips.critical.flags.valid)
469                 return_VALUE(-EINVAL);
470
471         if (tz->temperature >= tz->trips.critical.temperature) {
472                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Critical trip point\n"));
473                 tz->trips.critical.flags.enabled = 1;
474         } else if (tz->trips.critical.flags.enabled)
475                 tz->trips.critical.flags.enabled = 0;
476
477         result = acpi_bus_get_device(tz->handle, &device);
478         if (result)
479                 return_VALUE(result);
480
481         printk(KERN_EMERG
482                "Critical temperature reached (%ld C), shutting down.\n",
483                KELVIN_TO_CELSIUS(tz->temperature));
484         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL,
485                                 tz->trips.critical.flags.enabled);
486
487         acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
488
489         return_VALUE(0);
490 }
491
492 static int acpi_thermal_hot(struct acpi_thermal *tz)
493 {
494         int result = 0;
495         struct acpi_device *device = NULL;
496
497         ACPI_FUNCTION_TRACE("acpi_thermal_hot");
498
499         if (!tz || !tz->trips.hot.flags.valid)
500                 return_VALUE(-EINVAL);
501
502         if (tz->temperature >= tz->trips.hot.temperature) {
503                 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Hot trip point\n"));
504                 tz->trips.hot.flags.enabled = 1;
505         } else if (tz->trips.hot.flags.enabled)
506                 tz->trips.hot.flags.enabled = 0;
507
508         result = acpi_bus_get_device(tz->handle, &device);
509         if (result)
510                 return_VALUE(result);
511
512         acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT,
513                                 tz->trips.hot.flags.enabled);
514
515         /* TBD: Call user-mode "sleep(S4)" function */
516
517         return_VALUE(0);
518 }
519
520 static void acpi_thermal_passive(struct acpi_thermal *tz)
521 {
522         int result = 1;
523         struct acpi_thermal_passive *passive = NULL;
524         int trend = 0;
525         int i = 0;
526
527         ACPI_FUNCTION_TRACE("acpi_thermal_passive");
528
529         if (!tz || !tz->trips.passive.flags.valid)
530                 return;
531
532         passive = &(tz->trips.passive);
533
534         /*
535          * Above Trip?
536          * -----------
537          * Calculate the thermal trend (using the passive cooling equation)
538          * and modify the performance limit for all passive cooling devices
539          * accordingly.  Note that we assume symmetry.
540          */
541         if (tz->temperature >= passive->temperature) {
542                 trend =
543                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
544                     (passive->tc2 * (tz->temperature - passive->temperature));
545                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
546                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
547                                   trend, passive->tc1, tz->temperature,
548                                   tz->last_temperature, passive->tc2,
549                                   tz->temperature, passive->temperature));
550                 passive->flags.enabled = 1;
551                 /* Heating up? */
552                 if (trend > 0)
553                         for (i = 0; i < passive->devices.count; i++)
554                                 acpi_processor_set_thermal_limit(passive->
555                                                                  devices.
556                                                                  handles[i],
557                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
558                 /* Cooling off? */
559                 else if (trend < 0) {
560                         for (i = 0; i < passive->devices.count; i++)
561                                 /*
562                                  * assume that we are on highest
563                                  * freq/lowest thrott and can leave
564                                  * passive mode, even in error case
565                                  */
566                                 if (!acpi_processor_set_thermal_limit
567                                     (passive->devices.handles[i],
568                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
569                                         result = 0;
570                         /*
571                          * Leave cooling mode, even if the temp might
572                          * higher than trip point This is because some
573                          * machines might have long thermal polling
574                          * frequencies (tsp) defined. We will fall back
575                          * into passive mode in next cycle (probably quicker)
576                          */
577                         if (result) {
578                                 passive->flags.enabled = 0;
579                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
580                                                   "Disabling passive cooling, still above threshold,"
581                                                   " but we are cooling down\n"));
582                         }
583                 }
584                 return;
585         }
586
587         /*
588          * Below Trip?
589          * -----------
590          * Implement passive cooling hysteresis to slowly increase performance
591          * and avoid thrashing around the passive trip point.  Note that we
592          * assume symmetry.
593          */
594         if (!passive->flags.enabled)
595                 return;
596         for (i = 0; i < passive->devices.count; i++)
597                 if (!acpi_processor_set_thermal_limit
598                     (passive->devices.handles[i],
599                      ACPI_PROCESSOR_LIMIT_DECREMENT))
600                         result = 0;
601         if (result) {
602                 passive->flags.enabled = 0;
603                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
604                                   "Disabling passive cooling (zone is cool)\n"));
605         }
606 }
607
608 static void acpi_thermal_active(struct acpi_thermal *tz)
609 {
610         int result = 0;
611         struct acpi_thermal_active *active = NULL;
612         int i = 0;
613         int j = 0;
614         unsigned long maxtemp = 0;
615
616         ACPI_FUNCTION_TRACE("acpi_thermal_active");
617
618         if (!tz)
619                 return;
620
621         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
622                 active = &(tz->trips.active[i]);
623                 if (!active || !active->flags.valid)
624                         break;
625                 if (tz->temperature >= active->temperature) {
626                         /*
627                          * Above Threshold?
628                          * ----------------
629                          * If not already enabled, turn ON all cooling devices
630                          * associated with this active threshold.
631                          */
632                         if (active->temperature > maxtemp)
633                                 tz->state.active_index = i;
634                         maxtemp = active->temperature;
635                         if (active->flags.enabled)
636                                 continue;
637                         for (j = 0; j < active->devices.count; j++) {
638                                 result =
639                                     acpi_bus_set_power(active->devices.
640                                                        handles[j],
641                                                        ACPI_STATE_D0);
642                                 if (result) {
643                                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
644                                                           "Unable to turn cooling device [%p] 'on'\n",
645                                                           active->devices.
646                                                           handles[j]));
647                                         continue;
648                                 }
649                                 active->flags.enabled = 1;
650                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
651                                                   "Cooling device [%p] now 'on'\n",
652                                                   active->devices.handles[j]));
653                         }
654                         continue;
655                 }
656                 if (!active->flags.enabled)
657                         continue;
658                 /*
659                  * Below Threshold?
660                  * ----------------
661                  * Turn OFF all cooling devices associated with this
662                  * threshold.
663                  */
664                 for (j = 0; j < active->devices.count; j++) {
665                         result = acpi_bus_set_power(active->devices.handles[j],
666                                                     ACPI_STATE_D3);
667                         if (result) {
668                                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
669                                                   "Unable to turn cooling device [%p] 'off'\n",
670                                                   active->devices.handles[j]));
671                                 continue;
672                         }
673                         active->flags.enabled = 0;
674                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
675                                           "Cooling device [%p] now 'off'\n",
676                                           active->devices.handles[j]));
677                 }
678         }
679 }
680
681 static void acpi_thermal_check(void *context);
682
683 static void acpi_thermal_run(unsigned long data)
684 {
685         struct acpi_thermal *tz = (struct acpi_thermal *)data;
686         if (!tz->zombie)
687                 acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
688                                             acpi_thermal_check, (void *)data);
689 }
690
691 static void acpi_thermal_check(void *data)
692 {
693         int result = 0;
694         struct acpi_thermal *tz = (struct acpi_thermal *)data;
695         unsigned long sleep_time = 0;
696         int i = 0;
697         struct acpi_thermal_state state;
698
699         ACPI_FUNCTION_TRACE("acpi_thermal_check");
700
701         if (!tz) {
702                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
703                 return_VOID;
704         }
705
706         state = tz->state;
707
708         result = acpi_thermal_get_temperature(tz);
709         if (result)
710                 return_VOID;
711
712         memset(&tz->state, 0, sizeof(tz->state));
713
714         /*
715          * Check Trip Points
716          * -----------------
717          * Compare the current temperature to the trip point values to see
718          * if we've entered one of the thermal policy states.  Note that
719          * this function determines when a state is entered, but the 
720          * individual policy decides when it is exited (e.g. hysteresis).
721          */
722         if (tz->trips.critical.flags.valid)
723                 state.critical |=
724                     (tz->temperature >= tz->trips.critical.temperature);
725         if (tz->trips.hot.flags.valid)
726                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
727         if (tz->trips.passive.flags.valid)
728                 state.passive |=
729                     (tz->temperature >= tz->trips.passive.temperature);
730         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
731                 if (tz->trips.active[i].flags.valid)
732                         state.active |=
733                             (tz->temperature >=
734                              tz->trips.active[i].temperature);
735
736         /*
737          * Invoke Policy
738          * -------------
739          * Separated from the above check to allow individual policy to 
740          * determine when to exit a given state.
741          */
742         if (state.critical)
743                 acpi_thermal_critical(tz);
744         if (state.hot)
745                 acpi_thermal_hot(tz);
746         if (state.passive)
747                 acpi_thermal_passive(tz);
748         if (state.active)
749                 acpi_thermal_active(tz);
750
751         /*
752          * Calculate State
753          * ---------------
754          * Again, separated from the above two to allow independent policy
755          * decisions.
756          */
757         tz->state.critical = tz->trips.critical.flags.enabled;
758         tz->state.hot = tz->trips.hot.flags.enabled;
759         tz->state.passive = tz->trips.passive.flags.enabled;
760         tz->state.active = 0;
761         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
762                 tz->state.active |= tz->trips.active[i].flags.enabled;
763
764         /*
765          * Calculate Sleep Time
766          * --------------------
767          * If we're in the passive state, use _TSP's value.  Otherwise
768          * use the default polling frequency (e.g. _TZP).  If no polling
769          * frequency is specified then we'll wait forever (at least until
770          * a thermal event occurs).  Note that _TSP and _TZD values are
771          * given in 1/10th seconds (we must covert to milliseconds).
772          */
773         if (tz->state.passive)
774                 sleep_time = tz->trips.passive.tsp * 100;
775         else if (tz->polling_frequency > 0)
776                 sleep_time = tz->polling_frequency * 100;
777
778         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
779                           tz->name, tz->temperature, sleep_time));
780
781         /*
782          * Schedule Next Poll
783          * ------------------
784          */
785         if (!sleep_time) {
786                 if (timer_pending(&(tz->timer)))
787                         del_timer(&(tz->timer));
788         } else {
789                 if (timer_pending(&(tz->timer)))
790                         mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
791                 else {
792                         tz->timer.data = (unsigned long)tz;
793                         tz->timer.function = acpi_thermal_run;
794                         tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
795                         add_timer(&(tz->timer));
796                 }
797         }
798
799         return_VOID;
800 }
801
802 /* --------------------------------------------------------------------------
803                               FS Interface (/proc)
804    -------------------------------------------------------------------------- */
805
806 static struct proc_dir_entry *acpi_thermal_dir;
807
808 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
809 {
810         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
811
812         ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show");
813
814         if (!tz)
815                 goto end;
816
817         seq_puts(seq, "state:                   ");
818
819         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
820             && !tz->state.active)
821                 seq_puts(seq, "ok\n");
822         else {
823                 if (tz->state.critical)
824                         seq_puts(seq, "critical ");
825                 if (tz->state.hot)
826                         seq_puts(seq, "hot ");
827                 if (tz->state.passive)
828                         seq_puts(seq, "passive ");
829                 if (tz->state.active)
830                         seq_printf(seq, "active[%d]", tz->state.active_index);
831                 seq_puts(seq, "\n");
832         }
833
834       end:
835         return_VALUE(0);
836 }
837
838 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
839 {
840         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
841 }
842
843 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
844 {
845         int result = 0;
846         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
847
848         ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show");
849
850         if (!tz)
851                 goto end;
852
853         result = acpi_thermal_get_temperature(tz);
854         if (result)
855                 goto end;
856
857         seq_printf(seq, "temperature:             %ld C\n",
858                    KELVIN_TO_CELSIUS(tz->temperature));
859
860       end:
861         return_VALUE(0);
862 }
863
864 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
865 {
866         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
867 }
868
869 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
870 {
871         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
872         int i = 0;
873         int j = 0;
874
875         ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show");
876
877         if (!tz)
878                 goto end;
879
880         if (tz->trips.critical.flags.valid)
881                 seq_printf(seq, "critical (S5):           %ld C\n",
882                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
883
884         if (tz->trips.hot.flags.valid)
885                 seq_printf(seq, "hot (S4):                %ld C\n",
886                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
887
888         if (tz->trips.passive.flags.valid) {
889                 seq_printf(seq,
890                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
891                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
892                            tz->trips.passive.tc1, tz->trips.passive.tc2,
893                            tz->trips.passive.tsp);
894                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
895
896                         seq_printf(seq, "0x%p ",
897                                    tz->trips.passive.devices.handles[j]);
898                 }
899                 seq_puts(seq, "\n");
900         }
901
902         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
903                 if (!(tz->trips.active[i].flags.valid))
904                         break;
905                 seq_printf(seq, "active[%d]:               %ld C: devices=",
906                            i,
907                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
908                 for (j = 0; j < tz->trips.active[i].devices.count; j++)
909                         seq_printf(seq, "0x%p ",
910                                    tz->trips.active[i].devices.handles[j]);
911                 seq_puts(seq, "\n");
912         }
913
914       end:
915         return_VALUE(0);
916 }
917
918 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
919 {
920         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
921 }
922
923 static ssize_t
924 acpi_thermal_write_trip_points(struct file *file,
925                                const char __user * buffer,
926                                size_t count, loff_t * ppos)
927 {
928         struct seq_file *m = (struct seq_file *)file->private_data;
929         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
930
931         char *limit_string;
932         int num, critical, hot, passive;
933         int *active;
934         int i = 0;
935
936         ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points");
937
938         limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
939         if (!limit_string)
940                 return_VALUE(-ENOMEM);
941
942         memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN);
943
944         active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
945         if (!active)
946                 return_VALUE(-ENOMEM);
947
948         if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
949                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
950                 count = -EINVAL;
951                 goto end;
952         }
953
954         if (copy_from_user(limit_string, buffer, count)) {
955                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
956                 count = -EFAULT;
957                 goto end;
958         }
959
960         limit_string[count] = '\0';
961
962         num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
963                      &critical, &hot, &passive,
964                      &active[0], &active[1], &active[2], &active[3], &active[4],
965                      &active[5], &active[6], &active[7], &active[8],
966                      &active[9]);
967         if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
968                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
969                 count = -EINVAL;
970                 goto end;
971         }
972
973         tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
974         tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
975         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
976         for (i = 0; i < num - 3; i++) {
977                 if (!(tz->trips.active[i].flags.valid))
978                         break;
979                 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
980         }
981
982       end:
983         kfree(active);
984         kfree(limit_string);
985         return_VALUE(count);
986 }
987
988 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
989 {
990         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
991
992         ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show");
993
994         if (!tz)
995                 goto end;
996
997         if (!tz->flags.cooling_mode) {
998                 seq_puts(seq, "<setting not supported>\n");
999         }
1000
1001         if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
1002                 seq_printf(seq, "cooling mode:  critical\n");
1003         else
1004                 seq_printf(seq, "cooling mode:  %s\n",
1005                            tz->cooling_mode ? "passive" : "active");
1006
1007       end:
1008         return_VALUE(0);
1009 }
1010
1011 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1012 {
1013         return single_open(file, acpi_thermal_cooling_seq_show,
1014                            PDE(inode)->data);
1015 }
1016
1017 static ssize_t
1018 acpi_thermal_write_cooling_mode(struct file *file,
1019                                 const char __user * buffer,
1020                                 size_t count, loff_t * ppos)
1021 {
1022         struct seq_file *m = (struct seq_file *)file->private_data;
1023         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1024         int result = 0;
1025         char mode_string[12] = { '\0' };
1026
1027         ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode");
1028
1029         if (!tz || (count > sizeof(mode_string) - 1))
1030                 return_VALUE(-EINVAL);
1031
1032         if (!tz->flags.cooling_mode)
1033                 return_VALUE(-ENODEV);
1034
1035         if (copy_from_user(mode_string, buffer, count))
1036                 return_VALUE(-EFAULT);
1037
1038         mode_string[count] = '\0';
1039
1040         result = acpi_thermal_set_cooling_mode(tz,
1041                                                simple_strtoul(mode_string, NULL,
1042                                                               0));
1043         if (result)
1044                 return_VALUE(result);
1045
1046         acpi_thermal_check(tz);
1047
1048         return_VALUE(count);
1049 }
1050
1051 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1052 {
1053         struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
1054
1055         ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show");
1056
1057         if (!tz)
1058                 goto end;
1059
1060         if (!tz->polling_frequency) {
1061                 seq_puts(seq, "<polling disabled>\n");
1062                 goto end;
1063         }
1064
1065         seq_printf(seq, "polling frequency:       %lu seconds\n",
1066                    (tz->polling_frequency / 10));
1067
1068       end:
1069         return_VALUE(0);
1070 }
1071
1072 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1073 {
1074         return single_open(file, acpi_thermal_polling_seq_show,
1075                            PDE(inode)->data);
1076 }
1077
1078 static ssize_t
1079 acpi_thermal_write_polling(struct file *file,
1080                            const char __user * buffer,
1081                            size_t count, loff_t * ppos)
1082 {
1083         struct seq_file *m = (struct seq_file *)file->private_data;
1084         struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1085         int result = 0;
1086         char polling_string[12] = { '\0' };
1087         int seconds = 0;
1088
1089         ACPI_FUNCTION_TRACE("acpi_thermal_write_polling");
1090
1091         if (!tz || (count > sizeof(polling_string) - 1))
1092                 return_VALUE(-EINVAL);
1093
1094         if (copy_from_user(polling_string, buffer, count))
1095                 return_VALUE(-EFAULT);
1096
1097         polling_string[count] = '\0';
1098
1099         seconds = simple_strtoul(polling_string, NULL, 0);
1100
1101         result = acpi_thermal_set_polling(tz, seconds);
1102         if (result)
1103                 return_VALUE(result);
1104
1105         acpi_thermal_check(tz);
1106
1107         return_VALUE(count);
1108 }
1109
1110 static int acpi_thermal_add_fs(struct acpi_device *device)
1111 {
1112         struct proc_dir_entry *entry = NULL;
1113
1114         ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
1115
1116         if (!acpi_device_dir(device)) {
1117                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1118                                                      acpi_thermal_dir);
1119                 if (!acpi_device_dir(device))
1120                         return_VALUE(-ENODEV);
1121                 acpi_device_dir(device)->owner = THIS_MODULE;
1122         }
1123
1124         /* 'state' [R] */
1125         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1126                                   S_IRUGO, acpi_device_dir(device));
1127         if (!entry)
1128                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1129                                   "Unable to create '%s' fs entry\n",
1130                                   ACPI_THERMAL_FILE_STATE));
1131         else {
1132                 entry->proc_fops = &acpi_thermal_state_fops;
1133                 entry->data = acpi_driver_data(device);
1134                 entry->owner = THIS_MODULE;
1135         }
1136
1137         /* 'temperature' [R] */
1138         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1139                                   S_IRUGO, acpi_device_dir(device));
1140         if (!entry)
1141                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1142                                   "Unable to create '%s' fs entry\n",
1143                                   ACPI_THERMAL_FILE_TEMPERATURE));
1144         else {
1145                 entry->proc_fops = &acpi_thermal_temp_fops;
1146                 entry->data = acpi_driver_data(device);
1147                 entry->owner = THIS_MODULE;
1148         }
1149
1150         /* 'trip_points' [R/W] */
1151         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1152                                   S_IFREG | S_IRUGO | S_IWUSR,
1153                                   acpi_device_dir(device));
1154         if (!entry)
1155                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1156                                   "Unable to create '%s' fs entry\n",
1157                                   ACPI_THERMAL_FILE_TRIP_POINTS));
1158         else {
1159                 entry->proc_fops = &acpi_thermal_trip_fops;
1160                 entry->data = acpi_driver_data(device);
1161                 entry->owner = THIS_MODULE;
1162         }
1163
1164         /* 'cooling_mode' [R/W] */
1165         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1166                                   S_IFREG | S_IRUGO | S_IWUSR,
1167                                   acpi_device_dir(device));
1168         if (!entry)
1169                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1170                                   "Unable to create '%s' fs entry\n",
1171                                   ACPI_THERMAL_FILE_COOLING_MODE));
1172         else {
1173                 entry->proc_fops = &acpi_thermal_cooling_fops;
1174                 entry->data = acpi_driver_data(device);
1175                 entry->owner = THIS_MODULE;
1176         }
1177
1178         /* 'polling_frequency' [R/W] */
1179         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1180                                   S_IFREG | S_IRUGO | S_IWUSR,
1181                                   acpi_device_dir(device));
1182         if (!entry)
1183                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1184                                   "Unable to create '%s' fs entry\n",
1185                                   ACPI_THERMAL_FILE_POLLING_FREQ));
1186         else {
1187                 entry->proc_fops = &acpi_thermal_polling_fops;
1188                 entry->data = acpi_driver_data(device);
1189                 entry->owner = THIS_MODULE;
1190         }
1191
1192         return_VALUE(0);
1193 }
1194
1195 static int acpi_thermal_remove_fs(struct acpi_device *device)
1196 {
1197         ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
1198
1199         if (acpi_device_dir(device)) {
1200                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1201                                   acpi_device_dir(device));
1202                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1203                                   acpi_device_dir(device));
1204                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1205                                   acpi_device_dir(device));
1206                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1207                                   acpi_device_dir(device));
1208                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1209                                   acpi_device_dir(device));
1210                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1211                 acpi_device_dir(device) = NULL;
1212         }
1213
1214         return_VALUE(0);
1215 }
1216
1217 /* --------------------------------------------------------------------------
1218                                  Driver Interface
1219    -------------------------------------------------------------------------- */
1220
1221 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1222 {
1223         struct acpi_thermal *tz = (struct acpi_thermal *)data;
1224         struct acpi_device *device = NULL;
1225
1226         ACPI_FUNCTION_TRACE("acpi_thermal_notify");
1227
1228         if (!tz)
1229                 return_VOID;
1230
1231         if (acpi_bus_get_device(tz->handle, &device))
1232                 return_VOID;
1233
1234         switch (event) {
1235         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1236                 acpi_thermal_check(tz);
1237                 break;
1238         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1239                 acpi_thermal_get_trip_points(tz);
1240                 acpi_thermal_check(tz);
1241                 acpi_bus_generate_event(device, event, 0);
1242                 break;
1243         case ACPI_THERMAL_NOTIFY_DEVICES:
1244                 if (tz->flags.devices)
1245                         acpi_thermal_get_devices(tz);
1246                 acpi_bus_generate_event(device, event, 0);
1247                 break;
1248         default:
1249                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1250                                   "Unsupported event [0x%x]\n", event));
1251                 break;
1252         }
1253
1254         return_VOID;
1255 }
1256
1257 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1258 {
1259         int result = 0;
1260
1261         ACPI_FUNCTION_TRACE("acpi_thermal_get_info");
1262
1263         if (!tz)
1264                 return_VALUE(-EINVAL);
1265
1266         /* Get temperature [_TMP] (required) */
1267         result = acpi_thermal_get_temperature(tz);
1268         if (result)
1269                 return_VALUE(result);
1270
1271         /* Get trip points [_CRT, _PSV, etc.] (required) */
1272         result = acpi_thermal_get_trip_points(tz);
1273         if (result)
1274                 return_VALUE(result);
1275
1276         /* Set the cooling mode [_SCP] to active cooling (default) */
1277         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1278         if (!result)
1279                 tz->flags.cooling_mode = 1;
1280         else {
1281                 /* Oh,we have not _SCP method.
1282                    Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1283                 tz->flags.cooling_mode = 0;
1284                 if (tz->trips.active[0].flags.valid
1285                     && tz->trips.passive.flags.valid) {
1286                         if (tz->trips.passive.temperature >
1287                             tz->trips.active[0].temperature)
1288                                 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1289                         else
1290                                 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1291                 } else if (!tz->trips.active[0].flags.valid
1292                            && tz->trips.passive.flags.valid) {
1293                         tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1294                 } else if (tz->trips.active[0].flags.valid
1295                            && !tz->trips.passive.flags.valid) {
1296                         tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1297                 } else {
1298                         /* _ACx and _PSV are optional, but _CRT is required */
1299                         tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1300                 }
1301         }
1302
1303         /* Get default polling frequency [_TZP] (optional) */
1304         if (tzp)
1305                 tz->polling_frequency = tzp;
1306         else
1307                 acpi_thermal_get_polling_frequency(tz);
1308
1309         /* Get devices in this thermal zone [_TZD] (optional) */
1310         result = acpi_thermal_get_devices(tz);
1311         if (!result)
1312                 tz->flags.devices = 1;
1313
1314         return_VALUE(0);
1315 }
1316
1317 static int acpi_thermal_add(struct acpi_device *device)
1318 {
1319         int result = 0;
1320         acpi_status status = AE_OK;
1321         struct acpi_thermal *tz = NULL;
1322
1323         ACPI_FUNCTION_TRACE("acpi_thermal_add");
1324
1325         if (!device)
1326                 return_VALUE(-EINVAL);
1327
1328         tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1329         if (!tz)
1330                 return_VALUE(-ENOMEM);
1331         memset(tz, 0, sizeof(struct acpi_thermal));
1332
1333         tz->handle = device->handle;
1334         strcpy(tz->name, device->pnp.bus_id);
1335         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1336         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1337         acpi_driver_data(device) = tz;
1338
1339         result = acpi_thermal_get_info(tz);
1340         if (result)
1341                 goto end;
1342
1343         result = acpi_thermal_add_fs(device);
1344         if (result)
1345                 return_VALUE(result);
1346
1347         init_timer(&tz->timer);
1348
1349         acpi_thermal_check(tz);
1350
1351         status = acpi_install_notify_handler(tz->handle,
1352                                              ACPI_DEVICE_NOTIFY,
1353                                              acpi_thermal_notify, tz);
1354         if (ACPI_FAILURE(status)) {
1355                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1356                                   "Error installing notify handler\n"));
1357                 result = -ENODEV;
1358                 goto end;
1359         }
1360
1361         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1362                acpi_device_name(device), acpi_device_bid(device),
1363                KELVIN_TO_CELSIUS(tz->temperature));
1364
1365       end:
1366         if (result) {
1367                 acpi_thermal_remove_fs(device);
1368                 kfree(tz);
1369         }
1370
1371         return_VALUE(result);
1372 }
1373
1374 static int acpi_thermal_remove(struct acpi_device *device, int type)
1375 {
1376         acpi_status status = AE_OK;
1377         struct acpi_thermal *tz = NULL;
1378
1379         ACPI_FUNCTION_TRACE("acpi_thermal_remove");
1380
1381         if (!device || !acpi_driver_data(device))
1382                 return_VALUE(-EINVAL);
1383
1384         tz = (struct acpi_thermal *)acpi_driver_data(device);
1385
1386         /* avoid timer adding new defer task */
1387         tz->zombie = 1;
1388         /* wait for running timer (on other CPUs) finish */
1389         del_timer_sync(&(tz->timer));
1390         /* synchronize deferred task */
1391         acpi_os_wait_events_complete(NULL);
1392         /* deferred task may reinsert timer */
1393         del_timer_sync(&(tz->timer));
1394
1395         status = acpi_remove_notify_handler(tz->handle,
1396                                             ACPI_DEVICE_NOTIFY,
1397                                             acpi_thermal_notify);
1398         if (ACPI_FAILURE(status))
1399                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1400                                   "Error removing notify handler\n"));
1401
1402         /* Terminate policy */
1403         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1404                 tz->trips.passive.flags.enabled = 0;
1405                 acpi_thermal_passive(tz);
1406         }
1407         if (tz->trips.active[0].flags.valid
1408             && tz->trips.active[0].flags.enabled) {
1409                 tz->trips.active[0].flags.enabled = 0;
1410                 acpi_thermal_active(tz);
1411         }
1412
1413         acpi_thermal_remove_fs(device);
1414
1415         kfree(tz);
1416         return_VALUE(0);
1417 }
1418
1419 static int __init acpi_thermal_init(void)
1420 {
1421         int result = 0;
1422
1423         ACPI_FUNCTION_TRACE("acpi_thermal_init");
1424
1425         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1426         if (!acpi_thermal_dir)
1427                 return_VALUE(-ENODEV);
1428         acpi_thermal_dir->owner = THIS_MODULE;
1429
1430         result = acpi_bus_register_driver(&acpi_thermal_driver);
1431         if (result < 0) {
1432                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1433                 return_VALUE(-ENODEV);
1434         }
1435
1436         return_VALUE(0);
1437 }
1438
1439 static void __exit acpi_thermal_exit(void)
1440 {
1441         ACPI_FUNCTION_TRACE("acpi_thermal_exit");
1442
1443         acpi_bus_unregister_driver(&acpi_thermal_driver);
1444
1445         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1446
1447         return_VOID;
1448 }
1449
1450 module_init(acpi_thermal_init);
1451 module_exit(acpi_thermal_exit);