Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux
[linux-drm-fsl-dcu.git] / drivers / acpi / thermal.c
1 /*
2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
3  *
4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or (at
12  *  your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful, but
15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  *  General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License along
20  *  with this program; if not, write to the Free Software Foundation, Inc.,
21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  *
25  *  This driver fully implements the ACPI thermal policy as described in the
26  *  ACPI 2.0 Specification.
27  *
28  *  TBD: 1. Implement passive cooling hysteresis.
29  *       2. Enhance passive cooling (CPU) states/limit interface to support
30  *          concepts of 'multiple limiters', upper/lower limits, etc.
31  *
32  */
33
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/dmi.h>
37 #include <linux/init.h>
38 #include <linux/slab.h>
39 #include <linux/types.h>
40 #include <linux/jiffies.h>
41 #include <linux/kmod.h>
42 #include <linux/reboot.h>
43 #include <linux/device.h>
44 #include <asm/uaccess.h>
45 #include <linux/thermal.h>
46 #include <acpi/acpi_bus.h>
47 #include <acpi/acpi_drivers.h>
48
49 #define PREFIX "ACPI: "
50
51 #define ACPI_THERMAL_CLASS              "thermal_zone"
52 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
53 #define ACPI_THERMAL_FILE_STATE         "state"
54 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
55 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
56 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
57 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
58 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
59 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
60 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
61 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
62 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
63 #define ACPI_THERMAL_MODE_ACTIVE        0x00
64
65 #define ACPI_THERMAL_MAX_ACTIVE 10
66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
67
68 #define _COMPONENT              ACPI_THERMAL_COMPONENT
69 ACPI_MODULE_NAME("thermal");
70
71 MODULE_AUTHOR("Paul Diefenbaugh");
72 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
73 MODULE_LICENSE("GPL");
74
75 static int act;
76 module_param(act, int, 0644);
77 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
78
79 static int crt;
80 module_param(crt, int, 0644);
81 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
82
83 static int tzp;
84 module_param(tzp, int, 0444);
85 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
86
87 static int nocrt;
88 module_param(nocrt, int, 0);
89 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
90
91 static int off;
92 module_param(off, int, 0);
93 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
94
95 static int psv;
96 module_param(psv, int, 0644);
97 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
98
99 static int acpi_thermal_add(struct acpi_device *device);
100 static int acpi_thermal_remove(struct acpi_device *device, int type);
101 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
102
103 static const struct acpi_device_id  thermal_device_ids[] = {
104         {ACPI_THERMAL_HID, 0},
105         {"", 0},
106 };
107 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
108
109 static int acpi_thermal_resume(struct device *dev);
110 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, NULL, acpi_thermal_resume);
111
112 static struct acpi_driver acpi_thermal_driver = {
113         .name = "thermal",
114         .class = ACPI_THERMAL_CLASS,
115         .ids = thermal_device_ids,
116         .ops = {
117                 .add = acpi_thermal_add,
118                 .remove = acpi_thermal_remove,
119                 .notify = acpi_thermal_notify,
120                 },
121         .drv.pm = &acpi_thermal_pm,
122 };
123
124 struct acpi_thermal_state {
125         u8 critical:1;
126         u8 hot:1;
127         u8 passive:1;
128         u8 active:1;
129         u8 reserved:4;
130         int active_index;
131 };
132
133 struct acpi_thermal_state_flags {
134         u8 valid:1;
135         u8 enabled:1;
136         u8 reserved:6;
137 };
138
139 struct acpi_thermal_critical {
140         struct acpi_thermal_state_flags flags;
141         unsigned long temperature;
142 };
143
144 struct acpi_thermal_hot {
145         struct acpi_thermal_state_flags flags;
146         unsigned long temperature;
147 };
148
149 struct acpi_thermal_passive {
150         struct acpi_thermal_state_flags flags;
151         unsigned long temperature;
152         unsigned long tc1;
153         unsigned long tc2;
154         unsigned long tsp;
155         struct acpi_handle_list devices;
156 };
157
158 struct acpi_thermal_active {
159         struct acpi_thermal_state_flags flags;
160         unsigned long temperature;
161         struct acpi_handle_list devices;
162 };
163
164 struct acpi_thermal_trips {
165         struct acpi_thermal_critical critical;
166         struct acpi_thermal_hot hot;
167         struct acpi_thermal_passive passive;
168         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
169 };
170
171 struct acpi_thermal_flags {
172         u8 cooling_mode:1;      /* _SCP */
173         u8 devices:1;           /* _TZD */
174         u8 reserved:6;
175 };
176
177 struct acpi_thermal {
178         struct acpi_device * device;
179         acpi_bus_id name;
180         unsigned long temperature;
181         unsigned long last_temperature;
182         unsigned long polling_frequency;
183         volatile u8 zombie;
184         struct acpi_thermal_flags flags;
185         struct acpi_thermal_state state;
186         struct acpi_thermal_trips trips;
187         struct acpi_handle_list devices;
188         struct thermal_zone_device *thermal_zone;
189         int tz_enabled;
190         int kelvin_offset;
191         struct mutex lock;
192 };
193
194 /* --------------------------------------------------------------------------
195                              Thermal Zone Management
196    -------------------------------------------------------------------------- */
197
198 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
199 {
200         acpi_status status = AE_OK;
201         unsigned long long tmp;
202
203         if (!tz)
204                 return -EINVAL;
205
206         tz->last_temperature = tz->temperature;
207
208         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
209         if (ACPI_FAILURE(status))
210                 return -ENODEV;
211
212         tz->temperature = tmp;
213         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
214                           tz->temperature));
215
216         return 0;
217 }
218
219 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
220 {
221         acpi_status status = AE_OK;
222         unsigned long long tmp;
223
224         if (!tz)
225                 return -EINVAL;
226
227         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
228         if (ACPI_FAILURE(status))
229                 return -ENODEV;
230
231         tz->polling_frequency = tmp;
232         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
233                           tz->polling_frequency));
234
235         return 0;
236 }
237
238 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
239 {
240         acpi_status status = AE_OK;
241         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
242         struct acpi_object_list arg_list = { 1, &arg0 };
243         acpi_handle handle = NULL;
244
245
246         if (!tz)
247                 return -EINVAL;
248
249         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
250         if (ACPI_FAILURE(status)) {
251                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
252                 return -ENODEV;
253         }
254
255         arg0.integer.value = mode;
256
257         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
258         if (ACPI_FAILURE(status))
259                 return -ENODEV;
260
261         return 0;
262 }
263
264 #define ACPI_TRIPS_CRITICAL     0x01
265 #define ACPI_TRIPS_HOT          0x02
266 #define ACPI_TRIPS_PASSIVE      0x04
267 #define ACPI_TRIPS_ACTIVE       0x08
268 #define ACPI_TRIPS_DEVICES      0x10
269
270 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
271 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
272
273 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
274                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
275                               ACPI_TRIPS_DEVICES)
276
277 /*
278  * This exception is thrown out in two cases:
279  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
280  *   when re-evaluating the AML code.
281  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
282  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
283  */
284 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
285 do {    \
286         if (flags != ACPI_TRIPS_INIT)   \
287                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
288                 "ACPI thermal trip point %s changed\n"  \
289                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
290 } while (0)
291
292 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
293 {
294         acpi_status status = AE_OK;
295         unsigned long long tmp;
296         struct acpi_handle_list devices;
297         int valid = 0;
298         int i;
299
300         /* Critical Shutdown */
301         if (flag & ACPI_TRIPS_CRITICAL) {
302                 status = acpi_evaluate_integer(tz->device->handle,
303                                 "_CRT", NULL, &tmp);
304                 tz->trips.critical.temperature = tmp;
305                 /*
306                  * Treat freezing temperatures as invalid as well; some
307                  * BIOSes return really low values and cause reboots at startup.
308                  * Below zero (Celsius) values clearly aren't right for sure..
309                  * ... so lets discard those as invalid.
310                  */
311                 if (ACPI_FAILURE(status)) {
312                         tz->trips.critical.flags.valid = 0;
313                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
314                                           "No critical threshold\n"));
315                 } else if (tmp <= 2732) {
316                         printk(KERN_WARNING FW_BUG "Invalid critical threshold "
317                                "(%llu)\n", tmp);
318                         tz->trips.critical.flags.valid = 0;
319                 } else {
320                         tz->trips.critical.flags.valid = 1;
321                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
322                                           "Found critical threshold [%lu]\n",
323                                           tz->trips.critical.temperature));
324                 }
325                 if (tz->trips.critical.flags.valid == 1) {
326                         if (crt == -1) {
327                                 tz->trips.critical.flags.valid = 0;
328                         } else if (crt > 0) {
329                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
330                                 /*
331                                  * Allow override critical threshold
332                                  */
333                                 if (crt_k > tz->trips.critical.temperature)
334                                         printk(KERN_WARNING PREFIX
335                                                 "Critical threshold %d C\n", crt);
336                                 tz->trips.critical.temperature = crt_k;
337                         }
338                 }
339         }
340
341         /* Critical Sleep (optional) */
342         if (flag & ACPI_TRIPS_HOT) {
343                 status = acpi_evaluate_integer(tz->device->handle,
344                                 "_HOT", NULL, &tmp);
345                 if (ACPI_FAILURE(status)) {
346                         tz->trips.hot.flags.valid = 0;
347                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
348                                         "No hot threshold\n"));
349                 } else {
350                         tz->trips.hot.temperature = tmp;
351                         tz->trips.hot.flags.valid = 1;
352                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
353                                         "Found hot threshold [%lu]\n",
354                                         tz->trips.critical.temperature));
355                 }
356         }
357
358         /* Passive (optional) */
359         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
360                 (flag == ACPI_TRIPS_INIT)) {
361                 valid = tz->trips.passive.flags.valid;
362                 if (psv == -1) {
363                         status = AE_SUPPORT;
364                 } else if (psv > 0) {
365                         tmp = CELSIUS_TO_KELVIN(psv);
366                         status = AE_OK;
367                 } else {
368                         status = acpi_evaluate_integer(tz->device->handle,
369                                 "_PSV", NULL, &tmp);
370                 }
371
372                 if (ACPI_FAILURE(status))
373                         tz->trips.passive.flags.valid = 0;
374                 else {
375                         tz->trips.passive.temperature = tmp;
376                         tz->trips.passive.flags.valid = 1;
377                         if (flag == ACPI_TRIPS_INIT) {
378                                 status = acpi_evaluate_integer(
379                                                 tz->device->handle, "_TC1",
380                                                 NULL, &tmp);
381                                 if (ACPI_FAILURE(status))
382                                         tz->trips.passive.flags.valid = 0;
383                                 else
384                                         tz->trips.passive.tc1 = tmp;
385                                 status = acpi_evaluate_integer(
386                                                 tz->device->handle, "_TC2",
387                                                 NULL, &tmp);
388                                 if (ACPI_FAILURE(status))
389                                         tz->trips.passive.flags.valid = 0;
390                                 else
391                                         tz->trips.passive.tc2 = tmp;
392                                 status = acpi_evaluate_integer(
393                                                 tz->device->handle, "_TSP",
394                                                 NULL, &tmp);
395                                 if (ACPI_FAILURE(status))
396                                         tz->trips.passive.flags.valid = 0;
397                                 else
398                                         tz->trips.passive.tsp = tmp;
399                         }
400                 }
401         }
402         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
403                 memset(&devices, 0, sizeof(struct acpi_handle_list));
404                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
405                                                         NULL, &devices);
406                 if (ACPI_FAILURE(status)) {
407                         printk(KERN_WARNING PREFIX
408                                 "Invalid passive threshold\n");
409                         tz->trips.passive.flags.valid = 0;
410                 }
411                 else
412                         tz->trips.passive.flags.valid = 1;
413
414                 if (memcmp(&tz->trips.passive.devices, &devices,
415                                 sizeof(struct acpi_handle_list))) {
416                         memcpy(&tz->trips.passive.devices, &devices,
417                                 sizeof(struct acpi_handle_list));
418                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
419                 }
420         }
421         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
422                 if (valid != tz->trips.passive.flags.valid)
423                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
424         }
425
426         /* Active (optional) */
427         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
428                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
429                 valid = tz->trips.active[i].flags.valid;
430
431                 if (act == -1)
432                         break; /* disable all active trip points */
433
434                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
435                         tz->trips.active[i].flags.valid)) {
436                         status = acpi_evaluate_integer(tz->device->handle,
437                                                         name, NULL, &tmp);
438                         if (ACPI_FAILURE(status)) {
439                                 tz->trips.active[i].flags.valid = 0;
440                                 if (i == 0)
441                                         break;
442                                 if (act <= 0)
443                                         break;
444                                 if (i == 1)
445                                         tz->trips.active[0].temperature =
446                                                 CELSIUS_TO_KELVIN(act);
447                                 else
448                                         /*
449                                          * Don't allow override higher than
450                                          * the next higher trip point
451                                          */
452                                         tz->trips.active[i - 1].temperature =
453                                                 (tz->trips.active[i - 2].temperature <
454                                                 CELSIUS_TO_KELVIN(act) ?
455                                                 tz->trips.active[i - 2].temperature :
456                                                 CELSIUS_TO_KELVIN(act));
457                                 break;
458                         } else {
459                                 tz->trips.active[i].temperature = tmp;
460                                 tz->trips.active[i].flags.valid = 1;
461                         }
462                 }
463
464                 name[2] = 'L';
465                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
466                         memset(&devices, 0, sizeof(struct acpi_handle_list));
467                         status = acpi_evaluate_reference(tz->device->handle,
468                                                 name, NULL, &devices);
469                         if (ACPI_FAILURE(status)) {
470                                 printk(KERN_WARNING PREFIX
471                                         "Invalid active%d threshold\n", i);
472                                 tz->trips.active[i].flags.valid = 0;
473                         }
474                         else
475                                 tz->trips.active[i].flags.valid = 1;
476
477                         if (memcmp(&tz->trips.active[i].devices, &devices,
478                                         sizeof(struct acpi_handle_list))) {
479                                 memcpy(&tz->trips.active[i].devices, &devices,
480                                         sizeof(struct acpi_handle_list));
481                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
482                         }
483                 }
484                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
485                         if (valid != tz->trips.active[i].flags.valid)
486                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
487
488                 if (!tz->trips.active[i].flags.valid)
489                         break;
490         }
491
492         if (flag & ACPI_TRIPS_DEVICES) {
493                 memset(&devices, 0, sizeof(struct acpi_handle_list));
494                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
495                                                 NULL, &devices);
496                 if (memcmp(&tz->devices, &devices,
497                                 sizeof(struct acpi_handle_list))) {
498                         memcpy(&tz->devices, &devices,
499                                 sizeof(struct acpi_handle_list));
500                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
501                 }
502         }
503
504         return 0;
505 }
506
507 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
508 {
509         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
510
511         if (ret)
512                 return ret;
513
514         valid = tz->trips.critical.flags.valid |
515                 tz->trips.hot.flags.valid |
516                 tz->trips.passive.flags.valid;
517
518         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
519                 valid |= tz->trips.active[i].flags.valid;
520
521         if (!valid) {
522                 printk(KERN_WARNING FW_BUG "No valid trip found\n");
523                 return -ENODEV;
524         }
525         return 0;
526 }
527
528 static void acpi_thermal_check(void *data)
529 {
530         struct acpi_thermal *tz = data;
531
532         thermal_zone_device_update(tz->thermal_zone);
533 }
534
535 /* sys I/F for generic thermal sysfs support */
536 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
537
538 static int thermal_get_temp(struct thermal_zone_device *thermal,
539                             unsigned long *temp)
540 {
541         struct acpi_thermal *tz = thermal->devdata;
542         int result;
543
544         if (!tz)
545                 return -EINVAL;
546
547         result = acpi_thermal_get_temperature(tz);
548         if (result)
549                 return result;
550
551         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
552         return 0;
553 }
554
555 static int thermal_get_mode(struct thermal_zone_device *thermal,
556                                 enum thermal_device_mode *mode)
557 {
558         struct acpi_thermal *tz = thermal->devdata;
559
560         if (!tz)
561                 return -EINVAL;
562
563         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
564                 THERMAL_DEVICE_DISABLED;
565
566         return 0;
567 }
568
569 static int thermal_set_mode(struct thermal_zone_device *thermal,
570                                 enum thermal_device_mode mode)
571 {
572         struct acpi_thermal *tz = thermal->devdata;
573         int enable;
574
575         if (!tz)
576                 return -EINVAL;
577
578         /*
579          * enable/disable thermal management from ACPI thermal driver
580          */
581         if (mode == THERMAL_DEVICE_ENABLED)
582                 enable = 1;
583         else if (mode == THERMAL_DEVICE_DISABLED)
584                 enable = 0;
585         else
586                 return -EINVAL;
587
588         if (enable != tz->tz_enabled) {
589                 tz->tz_enabled = enable;
590                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
591                         "%s kernel ACPI thermal control\n",
592                         tz->tz_enabled ? "Enable" : "Disable"));
593                 acpi_thermal_check(tz);
594         }
595         return 0;
596 }
597
598 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
599                                  int trip, enum thermal_trip_type *type)
600 {
601         struct acpi_thermal *tz = thermal->devdata;
602         int i;
603
604         if (!tz || trip < 0)
605                 return -EINVAL;
606
607         if (tz->trips.critical.flags.valid) {
608                 if (!trip) {
609                         *type = THERMAL_TRIP_CRITICAL;
610                         return 0;
611                 }
612                 trip--;
613         }
614
615         if (tz->trips.hot.flags.valid) {
616                 if (!trip) {
617                         *type = THERMAL_TRIP_HOT;
618                         return 0;
619                 }
620                 trip--;
621         }
622
623         if (tz->trips.passive.flags.valid) {
624                 if (!trip) {
625                         *type = THERMAL_TRIP_PASSIVE;
626                         return 0;
627                 }
628                 trip--;
629         }
630
631         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
632                 tz->trips.active[i].flags.valid; i++) {
633                 if (!trip) {
634                         *type = THERMAL_TRIP_ACTIVE;
635                         return 0;
636                 }
637                 trip--;
638         }
639
640         return -EINVAL;
641 }
642
643 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
644                                  int trip, unsigned long *temp)
645 {
646         struct acpi_thermal *tz = thermal->devdata;
647         int i;
648
649         if (!tz || trip < 0)
650                 return -EINVAL;
651
652         if (tz->trips.critical.flags.valid) {
653                 if (!trip) {
654                         *temp = KELVIN_TO_MILLICELSIUS(
655                                 tz->trips.critical.temperature,
656                                 tz->kelvin_offset);
657                         return 0;
658                 }
659                 trip--;
660         }
661
662         if (tz->trips.hot.flags.valid) {
663                 if (!trip) {
664                         *temp = KELVIN_TO_MILLICELSIUS(
665                                 tz->trips.hot.temperature,
666                                 tz->kelvin_offset);
667                         return 0;
668                 }
669                 trip--;
670         }
671
672         if (tz->trips.passive.flags.valid) {
673                 if (!trip) {
674                         *temp = KELVIN_TO_MILLICELSIUS(
675                                 tz->trips.passive.temperature,
676                                 tz->kelvin_offset);
677                         return 0;
678                 }
679                 trip--;
680         }
681
682         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
683                 tz->trips.active[i].flags.valid; i++) {
684                 if (!trip) {
685                         *temp = KELVIN_TO_MILLICELSIUS(
686                                 tz->trips.active[i].temperature,
687                                 tz->kelvin_offset);
688                         return 0;
689                 }
690                 trip--;
691         }
692
693         return -EINVAL;
694 }
695
696 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
697                                 unsigned long *temperature) {
698         struct acpi_thermal *tz = thermal->devdata;
699
700         if (tz->trips.critical.flags.valid) {
701                 *temperature = KELVIN_TO_MILLICELSIUS(
702                                 tz->trips.critical.temperature,
703                                 tz->kelvin_offset);
704                 return 0;
705         } else
706                 return -EINVAL;
707 }
708
709 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
710                            enum thermal_trip_type trip_type)
711 {
712         u8 type = 0;
713         struct acpi_thermal *tz = thermal->devdata;
714
715         if (trip_type == THERMAL_TRIP_CRITICAL)
716                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
717         else if (trip_type == THERMAL_TRIP_HOT)
718                 type = ACPI_THERMAL_NOTIFY_HOT;
719         else
720                 return 0;
721
722         acpi_bus_generate_proc_event(tz->device, type, 1);
723         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
724                                         dev_name(&tz->device->dev), type, 1);
725
726         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
727                 return 1;
728
729         return 0;
730 }
731
732 typedef int (*cb)(struct thermal_zone_device *, int,
733                   struct thermal_cooling_device *);
734 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
735                                         struct thermal_cooling_device *cdev,
736                                         cb action)
737 {
738         struct acpi_device *device = cdev->devdata;
739         struct acpi_thermal *tz = thermal->devdata;
740         struct acpi_device *dev;
741         acpi_status status;
742         acpi_handle handle;
743         int i;
744         int j;
745         int trip = -1;
746         int result = 0;
747
748         if (tz->trips.critical.flags.valid)
749                 trip++;
750
751         if (tz->trips.hot.flags.valid)
752                 trip++;
753
754         if (tz->trips.passive.flags.valid) {
755                 trip++;
756                 for (i = 0; i < tz->trips.passive.devices.count;
757                     i++) {
758                         handle = tz->trips.passive.devices.handles[i];
759                         status = acpi_bus_get_device(handle, &dev);
760                         if (ACPI_SUCCESS(status) && (dev == device)) {
761                                 result = action(thermal, trip, cdev);
762                                 if (result)
763                                         goto failed;
764                         }
765                 }
766         }
767
768         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
769                 if (!tz->trips.active[i].flags.valid)
770                         break;
771                 trip++;
772                 for (j = 0;
773                     j < tz->trips.active[i].devices.count;
774                     j++) {
775                         handle = tz->trips.active[i].devices.handles[j];
776                         status = acpi_bus_get_device(handle, &dev);
777                         if (ACPI_SUCCESS(status) && (dev == device)) {
778                                 result = action(thermal, trip, cdev);
779                                 if (result)
780                                         goto failed;
781                         }
782                 }
783         }
784
785         for (i = 0; i < tz->devices.count; i++) {
786                 handle = tz->devices.handles[i];
787                 status = acpi_bus_get_device(handle, &dev);
788                 if (ACPI_SUCCESS(status) && (dev == device)) {
789                         result = action(thermal, -1, cdev);
790                         if (result)
791                                 goto failed;
792                 }
793         }
794
795 failed:
796         return result;
797 }
798
799 static int
800 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
801                                         struct thermal_cooling_device *cdev)
802 {
803         return acpi_thermal_cooling_device_cb(thermal, cdev,
804                                 thermal_zone_bind_cooling_device);
805 }
806
807 static int
808 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
809                                         struct thermal_cooling_device *cdev)
810 {
811         return acpi_thermal_cooling_device_cb(thermal, cdev,
812                                 thermal_zone_unbind_cooling_device);
813 }
814
815 static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
816         .bind = acpi_thermal_bind_cooling_device,
817         .unbind = acpi_thermal_unbind_cooling_device,
818         .get_temp = thermal_get_temp,
819         .get_mode = thermal_get_mode,
820         .set_mode = thermal_set_mode,
821         .get_trip_type = thermal_get_trip_type,
822         .get_trip_temp = thermal_get_trip_temp,
823         .get_crit_temp = thermal_get_crit_temp,
824         .notify = thermal_notify,
825 };
826
827 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
828 {
829         int trips = 0;
830         int result;
831         acpi_status status;
832         int i;
833
834         if (tz->trips.critical.flags.valid)
835                 trips++;
836
837         if (tz->trips.hot.flags.valid)
838                 trips++;
839
840         if (tz->trips.passive.flags.valid)
841                 trips++;
842
843         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
844                         tz->trips.active[i].flags.valid; i++, trips++);
845
846         if (tz->trips.passive.flags.valid)
847                 tz->thermal_zone =
848                         thermal_zone_device_register("acpitz", trips, 0, tz,
849                                                      &acpi_thermal_zone_ops,
850                                                      tz->trips.passive.tc1,
851                                                      tz->trips.passive.tc2,
852                                                      tz->trips.passive.tsp*100,
853                                                      tz->polling_frequency*100);
854         else
855                 tz->thermal_zone =
856                         thermal_zone_device_register("acpitz", trips, 0, tz,
857                                                      &acpi_thermal_zone_ops,
858                                                      0, 0, 0,
859                                                      tz->polling_frequency*100);
860         if (IS_ERR(tz->thermal_zone))
861                 return -ENODEV;
862
863         result = sysfs_create_link(&tz->device->dev.kobj,
864                                    &tz->thermal_zone->device.kobj, "thermal_zone");
865         if (result)
866                 return result;
867
868         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
869                                    &tz->device->dev.kobj, "device");
870         if (result)
871                 return result;
872
873         status = acpi_attach_data(tz->device->handle,
874                                   acpi_bus_private_data_handler,
875                                   tz->thermal_zone);
876         if (ACPI_FAILURE(status)) {
877                 printk(KERN_ERR PREFIX
878                                 "Error attaching device data\n");
879                 return -ENODEV;
880         }
881
882         tz->tz_enabled = 1;
883
884         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
885                  tz->thermal_zone->id);
886         return 0;
887 }
888
889 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
890 {
891         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
892         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
893         thermal_zone_device_unregister(tz->thermal_zone);
894         tz->thermal_zone = NULL;
895         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
896 }
897
898
899 /* --------------------------------------------------------------------------
900                                  Driver Interface
901    -------------------------------------------------------------------------- */
902
903 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
904 {
905         struct acpi_thermal *tz = acpi_driver_data(device);
906
907
908         if (!tz)
909                 return;
910
911         switch (event) {
912         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
913                 acpi_thermal_check(tz);
914                 break;
915         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
916                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
917                 acpi_thermal_check(tz);
918                 acpi_bus_generate_proc_event(device, event, 0);
919                 acpi_bus_generate_netlink_event(device->pnp.device_class,
920                                                   dev_name(&device->dev), event, 0);
921                 break;
922         case ACPI_THERMAL_NOTIFY_DEVICES:
923                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
924                 acpi_thermal_check(tz);
925                 acpi_bus_generate_proc_event(device, event, 0);
926                 acpi_bus_generate_netlink_event(device->pnp.device_class,
927                                                   dev_name(&device->dev), event, 0);
928                 break;
929         default:
930                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
931                                   "Unsupported event [0x%x]\n", event));
932                 break;
933         }
934 }
935
936 static int acpi_thermal_get_info(struct acpi_thermal *tz)
937 {
938         int result = 0;
939
940
941         if (!tz)
942                 return -EINVAL;
943
944         /* Get trip points [_CRT, _PSV, etc.] (required) */
945         result = acpi_thermal_get_trip_points(tz);
946         if (result)
947                 return result;
948
949         /* Get temperature [_TMP] (required) */
950         result = acpi_thermal_get_temperature(tz);
951         if (result)
952                 return result;
953
954         /* Set the cooling mode [_SCP] to active cooling (default) */
955         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
956         if (!result)
957                 tz->flags.cooling_mode = 1;
958
959         /* Get default polling frequency [_TZP] (optional) */
960         if (tzp)
961                 tz->polling_frequency = tzp;
962         else
963                 acpi_thermal_get_polling_frequency(tz);
964
965         return 0;
966 }
967
968 /*
969  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
970  * handles temperature values with a single decimal place. As a consequence,
971  * some implementations use an offset of 273.1 and others use an offset of
972  * 273.2. Try to find out which one is being used, to present the most
973  * accurate and visually appealing number.
974  *
975  * The heuristic below should work for all ACPI thermal zones which have a
976  * critical trip point with a value being a multiple of 0.5 degree Celsius.
977  */
978 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
979 {
980         if (tz->trips.critical.flags.valid &&
981             (tz->trips.critical.temperature % 5) == 1)
982                 tz->kelvin_offset = 2731;
983         else
984                 tz->kelvin_offset = 2732;
985 }
986
987 static int acpi_thermal_add(struct acpi_device *device)
988 {
989         int result = 0;
990         struct acpi_thermal *tz = NULL;
991
992
993         if (!device)
994                 return -EINVAL;
995
996         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
997         if (!tz)
998                 return -ENOMEM;
999
1000         tz->device = device;
1001         strcpy(tz->name, device->pnp.bus_id);
1002         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1003         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1004         device->driver_data = tz;
1005         mutex_init(&tz->lock);
1006
1007
1008         result = acpi_thermal_get_info(tz);
1009         if (result)
1010                 goto free_memory;
1011
1012         acpi_thermal_guess_offset(tz);
1013
1014         result = acpi_thermal_register_thermal_zone(tz);
1015         if (result)
1016                 goto free_memory;
1017
1018         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1019                acpi_device_name(device), acpi_device_bid(device),
1020                KELVIN_TO_CELSIUS(tz->temperature));
1021         goto end;
1022
1023 free_memory:
1024         kfree(tz);
1025 end:
1026         return result;
1027 }
1028
1029 static int acpi_thermal_remove(struct acpi_device *device, int type)
1030 {
1031         struct acpi_thermal *tz = NULL;
1032
1033         if (!device || !acpi_driver_data(device))
1034                 return -EINVAL;
1035
1036         tz = acpi_driver_data(device);
1037
1038         acpi_thermal_unregister_thermal_zone(tz);
1039         mutex_destroy(&tz->lock);
1040         kfree(tz);
1041         return 0;
1042 }
1043
1044 static int acpi_thermal_resume(struct device *dev)
1045 {
1046         struct acpi_thermal *tz;
1047         int i, j, power_state, result;
1048
1049         if (!dev)
1050                 return -EINVAL;
1051
1052         tz = acpi_driver_data(to_acpi_device(dev));
1053         if (!tz)
1054                 return -EINVAL;
1055
1056         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1057                 if (!(&tz->trips.active[i]))
1058                         break;
1059                 if (!tz->trips.active[i].flags.valid)
1060                         break;
1061                 tz->trips.active[i].flags.enabled = 1;
1062                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1063                         result = acpi_bus_update_power(
1064                                         tz->trips.active[i].devices.handles[j],
1065                                         &power_state);
1066                         if (result || (power_state != ACPI_STATE_D0)) {
1067                                 tz->trips.active[i].flags.enabled = 0;
1068                                 break;
1069                         }
1070                 }
1071                 tz->state.active |= tz->trips.active[i].flags.enabled;
1072         }
1073
1074         acpi_thermal_check(tz);
1075
1076         return AE_OK;
1077 }
1078
1079 static int thermal_act(const struct dmi_system_id *d) {
1080
1081         if (act == 0) {
1082                 printk(KERN_NOTICE "ACPI: %s detected: "
1083                         "disabling all active thermal trip points\n", d->ident);
1084                 act = -1;
1085         }
1086         return 0;
1087 }
1088 static int thermal_nocrt(const struct dmi_system_id *d) {
1089
1090         printk(KERN_NOTICE "ACPI: %s detected: "
1091                 "disabling all critical thermal trip point actions.\n", d->ident);
1092         nocrt = 1;
1093         return 0;
1094 }
1095 static int thermal_tzp(const struct dmi_system_id *d) {
1096
1097         if (tzp == 0) {
1098                 printk(KERN_NOTICE "ACPI: %s detected: "
1099                         "enabling thermal zone polling\n", d->ident);
1100                 tzp = 300;      /* 300 dS = 30 Seconds */
1101         }
1102         return 0;
1103 }
1104 static int thermal_psv(const struct dmi_system_id *d) {
1105
1106         if (psv == 0) {
1107                 printk(KERN_NOTICE "ACPI: %s detected: "
1108                         "disabling all passive thermal trip points\n", d->ident);
1109                 psv = -1;
1110         }
1111         return 0;
1112 }
1113
1114 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1115         /*
1116          * Award BIOS on this AOpen makes thermal control almost worthless.
1117          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1118          */
1119         {
1120          .callback = thermal_act,
1121          .ident = "AOpen i915GMm-HFS",
1122          .matches = {
1123                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1124                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1125                 },
1126         },
1127         {
1128          .callback = thermal_psv,
1129          .ident = "AOpen i915GMm-HFS",
1130          .matches = {
1131                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1132                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1133                 },
1134         },
1135         {
1136          .callback = thermal_tzp,
1137          .ident = "AOpen i915GMm-HFS",
1138          .matches = {
1139                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1140                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1141                 },
1142         },
1143         {
1144          .callback = thermal_nocrt,
1145          .ident = "Gigabyte GA-7ZX",
1146          .matches = {
1147                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1148                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1149                 },
1150         },
1151         {}
1152 };
1153
1154 static int __init acpi_thermal_init(void)
1155 {
1156         int result = 0;
1157
1158         dmi_check_system(thermal_dmi_table);
1159
1160         if (off) {
1161                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1162                 return -ENODEV;
1163         }
1164
1165         result = acpi_bus_register_driver(&acpi_thermal_driver);
1166         if (result < 0)
1167                 return -ENODEV;
1168
1169         return 0;
1170 }
1171
1172 static void __exit acpi_thermal_exit(void)
1173 {
1174
1175         acpi_bus_unregister_driver(&acpi_thermal_driver);
1176
1177         return;
1178 }
1179
1180 module_init(acpi_thermal_init);
1181 module_exit(acpi_thermal_exit);