Thermal: Remove tc1/tc2 in generic thermal layer.
[linux-2.6.git] / drivers / acpi / thermal.c
1 /*
2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
3  *
4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or (at
12  *  your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful, but
15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  *  General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License along
20  *  with this program; if not, write to the Free Software Foundation, Inc.,
21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  *
25  *  This driver fully implements the ACPI thermal policy as described in the
26  *  ACPI 2.0 Specification.
27  *
28  *  TBD: 1. Implement passive cooling hysteresis.
29  *       2. Enhance passive cooling (CPU) states/limit interface to support
30  *          concepts of 'multiple limiters', upper/lower limits, etc.
31  *
32  */
33
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/dmi.h>
37 #include <linux/init.h>
38 #include <linux/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 int acpi_thermal_resume(struct acpi_device *device);
102 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
103
104 static const struct acpi_device_id  thermal_device_ids[] = {
105         {ACPI_THERMAL_HID, 0},
106         {"", 0},
107 };
108 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
109
110 static struct acpi_driver acpi_thermal_driver = {
111         .name = "thermal",
112         .class = ACPI_THERMAL_CLASS,
113         .ids = thermal_device_ids,
114         .ops = {
115                 .add = acpi_thermal_add,
116                 .remove = acpi_thermal_remove,
117                 .resume = acpi_thermal_resume,
118                 .notify = acpi_thermal_notify,
119                 },
120 };
121
122 struct acpi_thermal_state {
123         u8 critical:1;
124         u8 hot:1;
125         u8 passive:1;
126         u8 active:1;
127         u8 reserved:4;
128         int active_index;
129 };
130
131 struct acpi_thermal_state_flags {
132         u8 valid:1;
133         u8 enabled:1;
134         u8 reserved:6;
135 };
136
137 struct acpi_thermal_critical {
138         struct acpi_thermal_state_flags flags;
139         unsigned long temperature;
140 };
141
142 struct acpi_thermal_hot {
143         struct acpi_thermal_state_flags flags;
144         unsigned long temperature;
145 };
146
147 struct acpi_thermal_passive {
148         struct acpi_thermal_state_flags flags;
149         unsigned long temperature;
150         unsigned long tc1;
151         unsigned long tc2;
152         unsigned long tsp;
153         struct acpi_handle_list devices;
154 };
155
156 struct acpi_thermal_active {
157         struct acpi_thermal_state_flags flags;
158         unsigned long temperature;
159         struct acpi_handle_list devices;
160 };
161
162 struct acpi_thermal_trips {
163         struct acpi_thermal_critical critical;
164         struct acpi_thermal_hot hot;
165         struct acpi_thermal_passive passive;
166         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
167 };
168
169 struct acpi_thermal_flags {
170         u8 cooling_mode:1;      /* _SCP */
171         u8 devices:1;           /* _TZD */
172         u8 reserved:6;
173 };
174
175 struct acpi_thermal {
176         struct acpi_device * device;
177         acpi_bus_id name;
178         unsigned long temperature;
179         unsigned long last_temperature;
180         unsigned long polling_frequency;
181         volatile u8 zombie;
182         struct acpi_thermal_flags flags;
183         struct acpi_thermal_state state;
184         struct acpi_thermal_trips trips;
185         struct acpi_handle_list devices;
186         struct thermal_zone_device *thermal_zone;
187         int tz_enabled;
188         int kelvin_offset;
189         struct mutex lock;
190 };
191
192 /* --------------------------------------------------------------------------
193                              Thermal Zone Management
194    -------------------------------------------------------------------------- */
195
196 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
197 {
198         acpi_status status = AE_OK;
199         unsigned long long tmp;
200
201         if (!tz)
202                 return -EINVAL;
203
204         tz->last_temperature = tz->temperature;
205
206         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
207         if (ACPI_FAILURE(status))
208                 return -ENODEV;
209
210         tz->temperature = tmp;
211         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
212                           tz->temperature));
213
214         return 0;
215 }
216
217 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
218 {
219         acpi_status status = AE_OK;
220         unsigned long long tmp;
221
222         if (!tz)
223                 return -EINVAL;
224
225         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
226         if (ACPI_FAILURE(status))
227                 return -ENODEV;
228
229         tz->polling_frequency = tmp;
230         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
231                           tz->polling_frequency));
232
233         return 0;
234 }
235
236 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
237 {
238         acpi_status status = AE_OK;
239         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
240         struct acpi_object_list arg_list = { 1, &arg0 };
241         acpi_handle handle = NULL;
242
243
244         if (!tz)
245                 return -EINVAL;
246
247         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
248         if (ACPI_FAILURE(status)) {
249                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
250                 return -ENODEV;
251         }
252
253         arg0.integer.value = mode;
254
255         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
256         if (ACPI_FAILURE(status))
257                 return -ENODEV;
258
259         return 0;
260 }
261
262 #define ACPI_TRIPS_CRITICAL     0x01
263 #define ACPI_TRIPS_HOT          0x02
264 #define ACPI_TRIPS_PASSIVE      0x04
265 #define ACPI_TRIPS_ACTIVE       0x08
266 #define ACPI_TRIPS_DEVICES      0x10
267
268 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
269 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
270
271 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
272                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
273                               ACPI_TRIPS_DEVICES)
274
275 /*
276  * This exception is thrown out in two cases:
277  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
278  *   when re-evaluating the AML code.
279  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
280  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
281  */
282 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
283 do {    \
284         if (flags != ACPI_TRIPS_INIT)   \
285                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
286                 "ACPI thermal trip point %s changed\n"  \
287                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
288 } while (0)
289
290 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
291 {
292         acpi_status status = AE_OK;
293         unsigned long long tmp;
294         struct acpi_handle_list devices;
295         int valid = 0;
296         int i;
297
298         /* Critical Shutdown */
299         if (flag & ACPI_TRIPS_CRITICAL) {
300                 status = acpi_evaluate_integer(tz->device->handle,
301                                 "_CRT", NULL, &tmp);
302                 tz->trips.critical.temperature = tmp;
303                 /*
304                  * Treat freezing temperatures as invalid as well; some
305                  * BIOSes return really low values and cause reboots at startup.
306                  * Below zero (Celsius) values clearly aren't right for sure..
307                  * ... so lets discard those as invalid.
308                  */
309                 if (ACPI_FAILURE(status)) {
310                         tz->trips.critical.flags.valid = 0;
311                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
312                                           "No critical threshold\n"));
313                 } else if (tmp <= 2732) {
314                         printk(KERN_WARNING FW_BUG "Invalid critical threshold "
315                                "(%llu)\n", tmp);
316                         tz->trips.critical.flags.valid = 0;
317                 } else {
318                         tz->trips.critical.flags.valid = 1;
319                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
320                                           "Found critical threshold [%lu]\n",
321                                           tz->trips.critical.temperature));
322                 }
323                 if (tz->trips.critical.flags.valid == 1) {
324                         if (crt == -1) {
325                                 tz->trips.critical.flags.valid = 0;
326                         } else if (crt > 0) {
327                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
328                                 /*
329                                  * Allow override critical threshold
330                                  */
331                                 if (crt_k > tz->trips.critical.temperature)
332                                         printk(KERN_WARNING PREFIX
333                                                 "Critical threshold %d C\n", crt);
334                                 tz->trips.critical.temperature = crt_k;
335                         }
336                 }
337         }
338
339         /* Critical Sleep (optional) */
340         if (flag & ACPI_TRIPS_HOT) {
341                 status = acpi_evaluate_integer(tz->device->handle,
342                                 "_HOT", NULL, &tmp);
343                 if (ACPI_FAILURE(status)) {
344                         tz->trips.hot.flags.valid = 0;
345                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
346                                         "No hot threshold\n"));
347                 } else {
348                         tz->trips.hot.temperature = tmp;
349                         tz->trips.hot.flags.valid = 1;
350                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
351                                         "Found hot threshold [%lu]\n",
352                                         tz->trips.critical.temperature));
353                 }
354         }
355
356         /* Passive (optional) */
357         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
358                 (flag == ACPI_TRIPS_INIT)) {
359                 valid = tz->trips.passive.flags.valid;
360                 if (psv == -1) {
361                         status = AE_SUPPORT;
362                 } else if (psv > 0) {
363                         tmp = CELSIUS_TO_KELVIN(psv);
364                         status = AE_OK;
365                 } else {
366                         status = acpi_evaluate_integer(tz->device->handle,
367                                 "_PSV", NULL, &tmp);
368                 }
369
370                 if (ACPI_FAILURE(status))
371                         tz->trips.passive.flags.valid = 0;
372                 else {
373                         tz->trips.passive.temperature = tmp;
374                         tz->trips.passive.flags.valid = 1;
375                         if (flag == ACPI_TRIPS_INIT) {
376                                 status = acpi_evaluate_integer(
377                                                 tz->device->handle, "_TC1",
378                                                 NULL, &tmp);
379                                 if (ACPI_FAILURE(status))
380                                         tz->trips.passive.flags.valid = 0;
381                                 else
382                                         tz->trips.passive.tc1 = tmp;
383                                 status = acpi_evaluate_integer(
384                                                 tz->device->handle, "_TC2",
385                                                 NULL, &tmp);
386                                 if (ACPI_FAILURE(status))
387                                         tz->trips.passive.flags.valid = 0;
388                                 else
389                                         tz->trips.passive.tc2 = tmp;
390                                 status = acpi_evaluate_integer(
391                                                 tz->device->handle, "_TSP",
392                                                 NULL, &tmp);
393                                 if (ACPI_FAILURE(status))
394                                         tz->trips.passive.flags.valid = 0;
395                                 else
396                                         tz->trips.passive.tsp = tmp;
397                         }
398                 }
399         }
400         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
401                 memset(&devices, 0, sizeof(struct acpi_handle_list));
402                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
403                                                         NULL, &devices);
404                 if (ACPI_FAILURE(status)) {
405                         printk(KERN_WARNING PREFIX
406                                 "Invalid passive threshold\n");
407                         tz->trips.passive.flags.valid = 0;
408                 }
409                 else
410                         tz->trips.passive.flags.valid = 1;
411
412                 if (memcmp(&tz->trips.passive.devices, &devices,
413                                 sizeof(struct acpi_handle_list))) {
414                         memcpy(&tz->trips.passive.devices, &devices,
415                                 sizeof(struct acpi_handle_list));
416                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
417                 }
418         }
419         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
420                 if (valid != tz->trips.passive.flags.valid)
421                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
422         }
423
424         /* Active (optional) */
425         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
426                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
427                 valid = tz->trips.active[i].flags.valid;
428
429                 if (act == -1)
430                         break; /* disable all active trip points */
431
432                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
433                         tz->trips.active[i].flags.valid)) {
434                         status = acpi_evaluate_integer(tz->device->handle,
435                                                         name, NULL, &tmp);
436                         if (ACPI_FAILURE(status)) {
437                                 tz->trips.active[i].flags.valid = 0;
438                                 if (i == 0)
439                                         break;
440                                 if (act <= 0)
441                                         break;
442                                 if (i == 1)
443                                         tz->trips.active[0].temperature =
444                                                 CELSIUS_TO_KELVIN(act);
445                                 else
446                                         /*
447                                          * Don't allow override higher than
448                                          * the next higher trip point
449                                          */
450                                         tz->trips.active[i - 1].temperature =
451                                                 (tz->trips.active[i - 2].temperature <
452                                                 CELSIUS_TO_KELVIN(act) ?
453                                                 tz->trips.active[i - 2].temperature :
454                                                 CELSIUS_TO_KELVIN(act));
455                                 break;
456                         } else {
457                                 tz->trips.active[i].temperature = tmp;
458                                 tz->trips.active[i].flags.valid = 1;
459                         }
460                 }
461
462                 name[2] = 'L';
463                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
464                         memset(&devices, 0, sizeof(struct acpi_handle_list));
465                         status = acpi_evaluate_reference(tz->device->handle,
466                                                 name, NULL, &devices);
467                         if (ACPI_FAILURE(status)) {
468                                 printk(KERN_WARNING PREFIX
469                                         "Invalid active%d threshold\n", i);
470                                 tz->trips.active[i].flags.valid = 0;
471                         }
472                         else
473                                 tz->trips.active[i].flags.valid = 1;
474
475                         if (memcmp(&tz->trips.active[i].devices, &devices,
476                                         sizeof(struct acpi_handle_list))) {
477                                 memcpy(&tz->trips.active[i].devices, &devices,
478                                         sizeof(struct acpi_handle_list));
479                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
480                         }
481                 }
482                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
483                         if (valid != tz->trips.active[i].flags.valid)
484                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
485
486                 if (!tz->trips.active[i].flags.valid)
487                         break;
488         }
489
490         if (flag & ACPI_TRIPS_DEVICES) {
491                 memset(&devices, 0, sizeof(struct acpi_handle_list));
492                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
493                                                 NULL, &devices);
494                 if (memcmp(&tz->devices, &devices,
495                                 sizeof(struct acpi_handle_list))) {
496                         memcpy(&tz->devices, &devices,
497                                 sizeof(struct acpi_handle_list));
498                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
499                 }
500         }
501
502         return 0;
503 }
504
505 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
506 {
507         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
508
509         if (ret)
510                 return ret;
511
512         valid = tz->trips.critical.flags.valid |
513                 tz->trips.hot.flags.valid |
514                 tz->trips.passive.flags.valid;
515
516         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
517                 valid |= tz->trips.active[i].flags.valid;
518
519         if (!valid) {
520                 printk(KERN_WARNING FW_BUG "No valid trip found\n");
521                 return -ENODEV;
522         }
523         return 0;
524 }
525
526 static void acpi_thermal_check(void *data)
527 {
528         struct acpi_thermal *tz = data;
529
530         thermal_zone_device_update(tz->thermal_zone);
531 }
532
533 /* sys I/F for generic thermal sysfs support */
534 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
535
536 static int thermal_get_temp(struct thermal_zone_device *thermal,
537                             unsigned long *temp)
538 {
539         struct acpi_thermal *tz = thermal->devdata;
540         int result;
541
542         if (!tz)
543                 return -EINVAL;
544
545         result = acpi_thermal_get_temperature(tz);
546         if (result)
547                 return result;
548
549         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
550         return 0;
551 }
552
553 static int thermal_get_mode(struct thermal_zone_device *thermal,
554                                 enum thermal_device_mode *mode)
555 {
556         struct acpi_thermal *tz = thermal->devdata;
557
558         if (!tz)
559                 return -EINVAL;
560
561         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
562                 THERMAL_DEVICE_DISABLED;
563
564         return 0;
565 }
566
567 static int thermal_set_mode(struct thermal_zone_device *thermal,
568                                 enum thermal_device_mode mode)
569 {
570         struct acpi_thermal *tz = thermal->devdata;
571         int enable;
572
573         if (!tz)
574                 return -EINVAL;
575
576         /*
577          * enable/disable thermal management from ACPI thermal driver
578          */
579         if (mode == THERMAL_DEVICE_ENABLED)
580                 enable = 1;
581         else if (mode == THERMAL_DEVICE_DISABLED)
582                 enable = 0;
583         else
584                 return -EINVAL;
585
586         if (enable != tz->tz_enabled) {
587                 tz->tz_enabled = enable;
588                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
589                         "%s kernel ACPI thermal control\n",
590                         tz->tz_enabled ? "Enable" : "Disable"));
591                 acpi_thermal_check(tz);
592         }
593         return 0;
594 }
595
596 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
597                                  int trip, enum thermal_trip_type *type)
598 {
599         struct acpi_thermal *tz = thermal->devdata;
600         int i;
601
602         if (!tz || trip < 0)
603                 return -EINVAL;
604
605         if (tz->trips.critical.flags.valid) {
606                 if (!trip) {
607                         *type = THERMAL_TRIP_CRITICAL;
608                         return 0;
609                 }
610                 trip--;
611         }
612
613         if (tz->trips.hot.flags.valid) {
614                 if (!trip) {
615                         *type = THERMAL_TRIP_HOT;
616                         return 0;
617                 }
618                 trip--;
619         }
620
621         if (tz->trips.passive.flags.valid) {
622                 if (!trip) {
623                         *type = THERMAL_TRIP_PASSIVE;
624                         return 0;
625                 }
626                 trip--;
627         }
628
629         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
630                 tz->trips.active[i].flags.valid; i++) {
631                 if (!trip) {
632                         *type = THERMAL_TRIP_ACTIVE;
633                         return 0;
634                 }
635                 trip--;
636         }
637
638         return -EINVAL;
639 }
640
641 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
642                                  int trip, unsigned long *temp)
643 {
644         struct acpi_thermal *tz = thermal->devdata;
645         int i;
646
647         if (!tz || trip < 0)
648                 return -EINVAL;
649
650         if (tz->trips.critical.flags.valid) {
651                 if (!trip) {
652                         *temp = KELVIN_TO_MILLICELSIUS(
653                                 tz->trips.critical.temperature,
654                                 tz->kelvin_offset);
655                         return 0;
656                 }
657                 trip--;
658         }
659
660         if (tz->trips.hot.flags.valid) {
661                 if (!trip) {
662                         *temp = KELVIN_TO_MILLICELSIUS(
663                                 tz->trips.hot.temperature,
664                                 tz->kelvin_offset);
665                         return 0;
666                 }
667                 trip--;
668         }
669
670         if (tz->trips.passive.flags.valid) {
671                 if (!trip) {
672                         *temp = KELVIN_TO_MILLICELSIUS(
673                                 tz->trips.passive.temperature,
674                                 tz->kelvin_offset);
675                         return 0;
676                 }
677                 trip--;
678         }
679
680         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
681                 tz->trips.active[i].flags.valid; i++) {
682                 if (!trip) {
683                         *temp = KELVIN_TO_MILLICELSIUS(
684                                 tz->trips.active[i].temperature,
685                                 tz->kelvin_offset);
686                         return 0;
687                 }
688                 trip--;
689         }
690
691         return -EINVAL;
692 }
693
694 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
695                                 unsigned long *temperature) {
696         struct acpi_thermal *tz = thermal->devdata;
697
698         if (tz->trips.critical.flags.valid) {
699                 *temperature = KELVIN_TO_MILLICELSIUS(
700                                 tz->trips.critical.temperature,
701                                 tz->kelvin_offset);
702                 return 0;
703         } else
704                 return -EINVAL;
705 }
706
707 static int thermal_get_trend(struct thermal_zone_device *thermal,
708                                 int trip, enum thermal_trend *trend)
709 {
710         struct acpi_thermal *tz = thermal->devdata;
711         enum thermal_trip_type type;
712         int i;
713
714         if (thermal_get_trip_type(thermal, trip, &type))
715                 return -EINVAL;
716
717         /* Only PASSIVE trip points need TREND */
718         if (type != THERMAL_TRIP_PASSIVE)
719                 return -EINVAL;
720
721         /*
722          * tz->temperature has already been updated by generic thermal layer,
723          * before this callback being invoked
724          */
725         i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
726                 + (tz->trips.passive.tc2
727                 * (tz->temperature - tz->trips.passive.temperature));
728
729         if (i > 0)
730                 *trend = THERMAL_TREND_RAISING;
731         else if (i < 0)
732                 *trend = THERMAL_TREND_DROPPING;
733         else
734                 *trend = THERMAL_TREND_STABLE;
735         return 0;
736 }
737
738
739 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
740                            enum thermal_trip_type trip_type)
741 {
742         u8 type = 0;
743         struct acpi_thermal *tz = thermal->devdata;
744
745         if (trip_type == THERMAL_TRIP_CRITICAL)
746                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
747         else if (trip_type == THERMAL_TRIP_HOT)
748                 type = ACPI_THERMAL_NOTIFY_HOT;
749         else
750                 return 0;
751
752         acpi_bus_generate_proc_event(tz->device, type, 1);
753         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
754                                         dev_name(&tz->device->dev), type, 1);
755
756         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
757                 return 1;
758
759         return 0;
760 }
761
762 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
763                                         struct thermal_cooling_device *cdev,
764                                         bool bind)
765 {
766         struct acpi_device *device = cdev->devdata;
767         struct acpi_thermal *tz = thermal->devdata;
768         struct acpi_device *dev;
769         acpi_status status;
770         acpi_handle handle;
771         int i;
772         int j;
773         int trip = -1;
774         int result = 0;
775
776         if (tz->trips.critical.flags.valid)
777                 trip++;
778
779         if (tz->trips.hot.flags.valid)
780                 trip++;
781
782         if (tz->trips.passive.flags.valid) {
783                 trip++;
784                 for (i = 0; i < tz->trips.passive.devices.count;
785                     i++) {
786                         handle = tz->trips.passive.devices.handles[i];
787                         status = acpi_bus_get_device(handle, &dev);
788                         if (ACPI_FAILURE(status) || dev != device)
789                                 continue;
790                         if (bind)
791                                 result =
792                                         thermal_zone_bind_cooling_device
793                                         (thermal, trip, cdev,
794                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
795                         else
796                                 result =
797                                         thermal_zone_unbind_cooling_device
798                                         (thermal, trip, cdev);
799                         if (result)
800                                 goto failed;
801                 }
802         }
803
804         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
805                 if (!tz->trips.active[i].flags.valid)
806                         break;
807                 trip++;
808                 for (j = 0;
809                     j < tz->trips.active[i].devices.count;
810                     j++) {
811                         handle = tz->trips.active[i].devices.handles[j];
812                         status = acpi_bus_get_device(handle, &dev);
813                         if (ACPI_FAILURE(status) || dev != device)
814                                 continue;
815                         if (bind)
816                                 result = thermal_zone_bind_cooling_device
817                                         (thermal, trip, cdev,
818                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
819                         else
820                                 result = thermal_zone_unbind_cooling_device
821                                         (thermal, trip, cdev);
822                         if (result)
823                                 goto failed;
824                 }
825         }
826
827         for (i = 0; i < tz->devices.count; i++) {
828                 handle = tz->devices.handles[i];
829                 status = acpi_bus_get_device(handle, &dev);
830                 if (ACPI_SUCCESS(status) && (dev == device)) {
831                         if (bind)
832                                 result = thermal_zone_bind_cooling_device
833                                                 (thermal, -1, cdev,
834                                                  THERMAL_NO_LIMIT,
835                                                  THERMAL_NO_LIMIT);
836                         else
837                                 result = thermal_zone_unbind_cooling_device
838                                                 (thermal, -1, cdev);
839                         if (result)
840                                 goto failed;
841                 }
842         }
843
844 failed:
845         return result;
846 }
847
848 static int
849 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
850                                         struct thermal_cooling_device *cdev)
851 {
852         return acpi_thermal_cooling_device_cb(thermal, cdev, true);
853 }
854
855 static int
856 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
857                                         struct thermal_cooling_device *cdev)
858 {
859         return acpi_thermal_cooling_device_cb(thermal, cdev, false);
860 }
861
862 static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
863         .bind = acpi_thermal_bind_cooling_device,
864         .unbind = acpi_thermal_unbind_cooling_device,
865         .get_temp = thermal_get_temp,
866         .get_mode = thermal_get_mode,
867         .set_mode = thermal_set_mode,
868         .get_trip_type = thermal_get_trip_type,
869         .get_trip_temp = thermal_get_trip_temp,
870         .get_crit_temp = thermal_get_crit_temp,
871         .get_trend = thermal_get_trend,
872         .notify = thermal_notify,
873 };
874
875 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
876 {
877         int trips = 0;
878         int result;
879         acpi_status status;
880         int i;
881
882         if (tz->trips.critical.flags.valid)
883                 trips++;
884
885         if (tz->trips.hot.flags.valid)
886                 trips++;
887
888         if (tz->trips.passive.flags.valid)
889                 trips++;
890
891         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
892                         tz->trips.active[i].flags.valid; i++, trips++);
893
894         if (tz->trips.passive.flags.valid)
895                 tz->thermal_zone =
896                         thermal_zone_device_register("acpitz", trips, 0, tz,
897                                                      &acpi_thermal_zone_ops,
898                                                      tz->trips.passive.tsp*100,
899                                                      tz->polling_frequency*100);
900         else
901                 tz->thermal_zone =
902                         thermal_zone_device_register("acpitz", trips, 0, tz,
903                                                      &acpi_thermal_zone_ops, 0,
904                                                      tz->polling_frequency*100);
905         if (IS_ERR(tz->thermal_zone))
906                 return -ENODEV;
907
908         result = sysfs_create_link(&tz->device->dev.kobj,
909                                    &tz->thermal_zone->device.kobj, "thermal_zone");
910         if (result)
911                 return result;
912
913         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
914                                    &tz->device->dev.kobj, "device");
915         if (result)
916                 return result;
917
918         status = acpi_attach_data(tz->device->handle,
919                                   acpi_bus_private_data_handler,
920                                   tz->thermal_zone);
921         if (ACPI_FAILURE(status)) {
922                 printk(KERN_ERR PREFIX
923                                 "Error attaching device data\n");
924                 return -ENODEV;
925         }
926
927         tz->tz_enabled = 1;
928
929         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
930                  tz->thermal_zone->id);
931         return 0;
932 }
933
934 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
935 {
936         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
937         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
938         thermal_zone_device_unregister(tz->thermal_zone);
939         tz->thermal_zone = NULL;
940         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
941 }
942
943
944 /* --------------------------------------------------------------------------
945                                  Driver Interface
946    -------------------------------------------------------------------------- */
947
948 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
949 {
950         struct acpi_thermal *tz = acpi_driver_data(device);
951
952
953         if (!tz)
954                 return;
955
956         switch (event) {
957         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
958                 acpi_thermal_check(tz);
959                 break;
960         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
961                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
962                 acpi_thermal_check(tz);
963                 acpi_bus_generate_proc_event(device, event, 0);
964                 acpi_bus_generate_netlink_event(device->pnp.device_class,
965                                                   dev_name(&device->dev), event, 0);
966                 break;
967         case ACPI_THERMAL_NOTIFY_DEVICES:
968                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
969                 acpi_thermal_check(tz);
970                 acpi_bus_generate_proc_event(device, event, 0);
971                 acpi_bus_generate_netlink_event(device->pnp.device_class,
972                                                   dev_name(&device->dev), event, 0);
973                 break;
974         default:
975                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
976                                   "Unsupported event [0x%x]\n", event));
977                 break;
978         }
979 }
980
981 static int acpi_thermal_get_info(struct acpi_thermal *tz)
982 {
983         int result = 0;
984
985
986         if (!tz)
987                 return -EINVAL;
988
989         /* Get trip points [_CRT, _PSV, etc.] (required) */
990         result = acpi_thermal_get_trip_points(tz);
991         if (result)
992                 return result;
993
994         /* Get temperature [_TMP] (required) */
995         result = acpi_thermal_get_temperature(tz);
996         if (result)
997                 return result;
998
999         /* Set the cooling mode [_SCP] to active cooling (default) */
1000         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1001         if (!result)
1002                 tz->flags.cooling_mode = 1;
1003
1004         /* Get default polling frequency [_TZP] (optional) */
1005         if (tzp)
1006                 tz->polling_frequency = tzp;
1007         else
1008                 acpi_thermal_get_polling_frequency(tz);
1009
1010         return 0;
1011 }
1012
1013 /*
1014  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1015  * handles temperature values with a single decimal place. As a consequence,
1016  * some implementations use an offset of 273.1 and others use an offset of
1017  * 273.2. Try to find out which one is being used, to present the most
1018  * accurate and visually appealing number.
1019  *
1020  * The heuristic below should work for all ACPI thermal zones which have a
1021  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1022  */
1023 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1024 {
1025         if (tz->trips.critical.flags.valid &&
1026             (tz->trips.critical.temperature % 5) == 1)
1027                 tz->kelvin_offset = 2731;
1028         else
1029                 tz->kelvin_offset = 2732;
1030 }
1031
1032 static int acpi_thermal_add(struct acpi_device *device)
1033 {
1034         int result = 0;
1035         struct acpi_thermal *tz = NULL;
1036
1037
1038         if (!device)
1039                 return -EINVAL;
1040
1041         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1042         if (!tz)
1043                 return -ENOMEM;
1044
1045         tz->device = device;
1046         strcpy(tz->name, device->pnp.bus_id);
1047         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1048         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1049         device->driver_data = tz;
1050         mutex_init(&tz->lock);
1051
1052
1053         result = acpi_thermal_get_info(tz);
1054         if (result)
1055                 goto free_memory;
1056
1057         acpi_thermal_guess_offset(tz);
1058
1059         result = acpi_thermal_register_thermal_zone(tz);
1060         if (result)
1061                 goto free_memory;
1062
1063         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1064                acpi_device_name(device), acpi_device_bid(device),
1065                KELVIN_TO_CELSIUS(tz->temperature));
1066         goto end;
1067
1068 free_memory:
1069         kfree(tz);
1070 end:
1071         return result;
1072 }
1073
1074 static int acpi_thermal_remove(struct acpi_device *device, int type)
1075 {
1076         struct acpi_thermal *tz = NULL;
1077
1078         if (!device || !acpi_driver_data(device))
1079                 return -EINVAL;
1080
1081         tz = acpi_driver_data(device);
1082
1083         acpi_thermal_unregister_thermal_zone(tz);
1084         mutex_destroy(&tz->lock);
1085         kfree(tz);
1086         return 0;
1087 }
1088
1089 static int acpi_thermal_resume(struct acpi_device *device)
1090 {
1091         struct acpi_thermal *tz = NULL;
1092         int i, j, power_state, result;
1093
1094
1095         if (!device || !acpi_driver_data(device))
1096                 return -EINVAL;
1097
1098         tz = acpi_driver_data(device);
1099
1100         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1101                 if (!(&tz->trips.active[i]))
1102                         break;
1103                 if (!tz->trips.active[i].flags.valid)
1104                         break;
1105                 tz->trips.active[i].flags.enabled = 1;
1106                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1107                         result = acpi_bus_update_power(
1108                                         tz->trips.active[i].devices.handles[j],
1109                                         &power_state);
1110                         if (result || (power_state != ACPI_STATE_D0)) {
1111                                 tz->trips.active[i].flags.enabled = 0;
1112                                 break;
1113                         }
1114                 }
1115                 tz->state.active |= tz->trips.active[i].flags.enabled;
1116         }
1117
1118         acpi_thermal_check(tz);
1119
1120         return AE_OK;
1121 }
1122
1123 static int thermal_act(const struct dmi_system_id *d) {
1124
1125         if (act == 0) {
1126                 printk(KERN_NOTICE "ACPI: %s detected: "
1127                         "disabling all active thermal trip points\n", d->ident);
1128                 act = -1;
1129         }
1130         return 0;
1131 }
1132 static int thermal_nocrt(const struct dmi_system_id *d) {
1133
1134         printk(KERN_NOTICE "ACPI: %s detected: "
1135                 "disabling all critical thermal trip point actions.\n", d->ident);
1136         nocrt = 1;
1137         return 0;
1138 }
1139 static int thermal_tzp(const struct dmi_system_id *d) {
1140
1141         if (tzp == 0) {
1142                 printk(KERN_NOTICE "ACPI: %s detected: "
1143                         "enabling thermal zone polling\n", d->ident);
1144                 tzp = 300;      /* 300 dS = 30 Seconds */
1145         }
1146         return 0;
1147 }
1148 static int thermal_psv(const struct dmi_system_id *d) {
1149
1150         if (psv == 0) {
1151                 printk(KERN_NOTICE "ACPI: %s detected: "
1152                         "disabling all passive thermal trip points\n", d->ident);
1153                 psv = -1;
1154         }
1155         return 0;
1156 }
1157
1158 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1159         /*
1160          * Award BIOS on this AOpen makes thermal control almost worthless.
1161          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1162          */
1163         {
1164          .callback = thermal_act,
1165          .ident = "AOpen i915GMm-HFS",
1166          .matches = {
1167                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1168                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1169                 },
1170         },
1171         {
1172          .callback = thermal_psv,
1173          .ident = "AOpen i915GMm-HFS",
1174          .matches = {
1175                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1176                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1177                 },
1178         },
1179         {
1180          .callback = thermal_tzp,
1181          .ident = "AOpen i915GMm-HFS",
1182          .matches = {
1183                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1184                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1185                 },
1186         },
1187         {
1188          .callback = thermal_nocrt,
1189          .ident = "Gigabyte GA-7ZX",
1190          .matches = {
1191                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1192                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1193                 },
1194         },
1195         {}
1196 };
1197
1198 static int __init acpi_thermal_init(void)
1199 {
1200         int result = 0;
1201
1202         dmi_check_system(thermal_dmi_table);
1203
1204         if (off) {
1205                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1206                 return -ENODEV;
1207         }
1208
1209         result = acpi_bus_register_driver(&acpi_thermal_driver);
1210         if (result < 0)
1211                 return -ENODEV;
1212
1213         return 0;
1214 }
1215
1216 static void __exit acpi_thermal_exit(void)
1217 {
1218
1219         acpi_bus_unregister_driver(&acpi_thermal_driver);
1220
1221         return;
1222 }
1223
1224 module_init(acpi_thermal_init);
1225 module_exit(acpi_thermal_exit);