ACPI / video: Quirk initial backlight level 0
[linux-3.10.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);
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 #ifdef CONFIG_PM_SLEEP
110 static int acpi_thermal_resume(struct device *dev);
111 #endif
112 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, NULL, acpi_thermal_resume);
113
114 static struct acpi_driver acpi_thermal_driver = {
115         .name = "thermal",
116         .class = ACPI_THERMAL_CLASS,
117         .ids = thermal_device_ids,
118         .ops = {
119                 .add = acpi_thermal_add,
120                 .remove = acpi_thermal_remove,
121                 .notify = acpi_thermal_notify,
122                 },
123         .drv.pm = &acpi_thermal_pm,
124 };
125
126 struct acpi_thermal_state {
127         u8 critical:1;
128         u8 hot:1;
129         u8 passive:1;
130         u8 active:1;
131         u8 reserved:4;
132         int active_index;
133 };
134
135 struct acpi_thermal_state_flags {
136         u8 valid:1;
137         u8 enabled:1;
138         u8 reserved:6;
139 };
140
141 struct acpi_thermal_critical {
142         struct acpi_thermal_state_flags flags;
143         unsigned long temperature;
144 };
145
146 struct acpi_thermal_hot {
147         struct acpi_thermal_state_flags flags;
148         unsigned long temperature;
149 };
150
151 struct acpi_thermal_passive {
152         struct acpi_thermal_state_flags flags;
153         unsigned long temperature;
154         unsigned long tc1;
155         unsigned long tc2;
156         unsigned long tsp;
157         struct acpi_handle_list devices;
158 };
159
160 struct acpi_thermal_active {
161         struct acpi_thermal_state_flags flags;
162         unsigned long temperature;
163         struct acpi_handle_list devices;
164 };
165
166 struct acpi_thermal_trips {
167         struct acpi_thermal_critical critical;
168         struct acpi_thermal_hot hot;
169         struct acpi_thermal_passive passive;
170         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
171 };
172
173 struct acpi_thermal_flags {
174         u8 cooling_mode:1;      /* _SCP */
175         u8 devices:1;           /* _TZD */
176         u8 reserved:6;
177 };
178
179 struct acpi_thermal {
180         struct acpi_device * device;
181         acpi_bus_id name;
182         unsigned long temperature;
183         unsigned long last_temperature;
184         unsigned long polling_frequency;
185         volatile u8 zombie;
186         struct acpi_thermal_flags flags;
187         struct acpi_thermal_state state;
188         struct acpi_thermal_trips trips;
189         struct acpi_handle_list devices;
190         struct thermal_zone_device *thermal_zone;
191         int tz_enabled;
192         int kelvin_offset;
193         struct mutex lock;
194 };
195
196 /* --------------------------------------------------------------------------
197                              Thermal Zone Management
198    -------------------------------------------------------------------------- */
199
200 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
201 {
202         acpi_status status = AE_OK;
203         unsigned long long tmp;
204
205         if (!tz)
206                 return -EINVAL;
207
208         tz->last_temperature = tz->temperature;
209
210         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
211         if (ACPI_FAILURE(status))
212                 return -ENODEV;
213
214         tz->temperature = tmp;
215         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
216                           tz->temperature));
217
218         return 0;
219 }
220
221 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
222 {
223         acpi_status status = AE_OK;
224         unsigned long long tmp;
225
226         if (!tz)
227                 return -EINVAL;
228
229         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
230         if (ACPI_FAILURE(status))
231                 return -ENODEV;
232
233         tz->polling_frequency = tmp;
234         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
235                           tz->polling_frequency));
236
237         return 0;
238 }
239
240 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
241 {
242         acpi_status status = AE_OK;
243         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
244         struct acpi_object_list arg_list = { 1, &arg0 };
245         acpi_handle handle = NULL;
246
247
248         if (!tz)
249                 return -EINVAL;
250
251         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
252         if (ACPI_FAILURE(status)) {
253                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
254                 return -ENODEV;
255         }
256
257         arg0.integer.value = mode;
258
259         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
260         if (ACPI_FAILURE(status))
261                 return -ENODEV;
262
263         return 0;
264 }
265
266 #define ACPI_TRIPS_CRITICAL     0x01
267 #define ACPI_TRIPS_HOT          0x02
268 #define ACPI_TRIPS_PASSIVE      0x04
269 #define ACPI_TRIPS_ACTIVE       0x08
270 #define ACPI_TRIPS_DEVICES      0x10
271
272 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
273 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
274
275 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
276                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
277                               ACPI_TRIPS_DEVICES)
278
279 /*
280  * This exception is thrown out in two cases:
281  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
282  *   when re-evaluating the AML code.
283  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
284  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
285  */
286 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
287 do {    \
288         if (flags != ACPI_TRIPS_INIT)   \
289                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
290                 "ACPI thermal trip point %s changed\n"  \
291                 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
292 } while (0)
293
294 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
295 {
296         acpi_status status = AE_OK;
297         unsigned long long tmp;
298         struct acpi_handle_list devices;
299         int valid = 0;
300         int i;
301
302         /* Critical Shutdown */
303         if (flag & ACPI_TRIPS_CRITICAL) {
304                 status = acpi_evaluate_integer(tz->device->handle,
305                                 "_CRT", NULL, &tmp);
306                 tz->trips.critical.temperature = tmp;
307                 /*
308                  * Treat freezing temperatures as invalid as well; some
309                  * BIOSes return really low values and cause reboots at startup.
310                  * Below zero (Celsius) values clearly aren't right for sure..
311                  * ... so lets discard those as invalid.
312                  */
313                 if (ACPI_FAILURE(status)) {
314                         tz->trips.critical.flags.valid = 0;
315                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
316                                           "No critical threshold\n"));
317                 } else if (tmp <= 2732) {
318                         printk(KERN_WARNING FW_BUG "Invalid critical threshold "
319                                "(%llu)\n", tmp);
320                         tz->trips.critical.flags.valid = 0;
321                 } else {
322                         tz->trips.critical.flags.valid = 1;
323                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
324                                           "Found critical threshold [%lu]\n",
325                                           tz->trips.critical.temperature));
326                 }
327                 if (tz->trips.critical.flags.valid == 1) {
328                         if (crt == -1) {
329                                 tz->trips.critical.flags.valid = 0;
330                         } else if (crt > 0) {
331                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
332                                 /*
333                                  * Allow override critical threshold
334                                  */
335                                 if (crt_k > tz->trips.critical.temperature)
336                                         printk(KERN_WARNING PREFIX
337                                                 "Critical threshold %d C\n", crt);
338                                 tz->trips.critical.temperature = crt_k;
339                         }
340                 }
341         }
342
343         /* Critical Sleep (optional) */
344         if (flag & ACPI_TRIPS_HOT) {
345                 status = acpi_evaluate_integer(tz->device->handle,
346                                 "_HOT", NULL, &tmp);
347                 if (ACPI_FAILURE(status)) {
348                         tz->trips.hot.flags.valid = 0;
349                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
350                                         "No hot threshold\n"));
351                 } else {
352                         tz->trips.hot.temperature = tmp;
353                         tz->trips.hot.flags.valid = 1;
354                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
355                                         "Found hot threshold [%lu]\n",
356                                         tz->trips.critical.temperature));
357                 }
358         }
359
360         /* Passive (optional) */
361         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
362                 (flag == ACPI_TRIPS_INIT)) {
363                 valid = tz->trips.passive.flags.valid;
364                 if (psv == -1) {
365                         status = AE_SUPPORT;
366                 } else if (psv > 0) {
367                         tmp = CELSIUS_TO_KELVIN(psv);
368                         status = AE_OK;
369                 } else {
370                         status = acpi_evaluate_integer(tz->device->handle,
371                                 "_PSV", NULL, &tmp);
372                 }
373
374                 if (ACPI_FAILURE(status))
375                         tz->trips.passive.flags.valid = 0;
376                 else {
377                         tz->trips.passive.temperature = tmp;
378                         tz->trips.passive.flags.valid = 1;
379                         if (flag == ACPI_TRIPS_INIT) {
380                                 status = acpi_evaluate_integer(
381                                                 tz->device->handle, "_TC1",
382                                                 NULL, &tmp);
383                                 if (ACPI_FAILURE(status))
384                                         tz->trips.passive.flags.valid = 0;
385                                 else
386                                         tz->trips.passive.tc1 = tmp;
387                                 status = acpi_evaluate_integer(
388                                                 tz->device->handle, "_TC2",
389                                                 NULL, &tmp);
390                                 if (ACPI_FAILURE(status))
391                                         tz->trips.passive.flags.valid = 0;
392                                 else
393                                         tz->trips.passive.tc2 = tmp;
394                                 status = acpi_evaluate_integer(
395                                                 tz->device->handle, "_TSP",
396                                                 NULL, &tmp);
397                                 if (ACPI_FAILURE(status))
398                                         tz->trips.passive.flags.valid = 0;
399                                 else
400                                         tz->trips.passive.tsp = tmp;
401                         }
402                 }
403         }
404         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
405                 memset(&devices, 0, sizeof(struct acpi_handle_list));
406                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
407                                                         NULL, &devices);
408                 if (ACPI_FAILURE(status)) {
409                         printk(KERN_WARNING PREFIX
410                                 "Invalid passive threshold\n");
411                         tz->trips.passive.flags.valid = 0;
412                 }
413                 else
414                         tz->trips.passive.flags.valid = 1;
415
416                 if (memcmp(&tz->trips.passive.devices, &devices,
417                                 sizeof(struct acpi_handle_list))) {
418                         memcpy(&tz->trips.passive.devices, &devices,
419                                 sizeof(struct acpi_handle_list));
420                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
421                 }
422         }
423         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
424                 if (valid != tz->trips.passive.flags.valid)
425                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
426         }
427
428         /* Active (optional) */
429         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
430                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
431                 valid = tz->trips.active[i].flags.valid;
432
433                 if (act == -1)
434                         break; /* disable all active trip points */
435
436                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
437                         tz->trips.active[i].flags.valid)) {
438                         status = acpi_evaluate_integer(tz->device->handle,
439                                                         name, NULL, &tmp);
440                         if (ACPI_FAILURE(status)) {
441                                 tz->trips.active[i].flags.valid = 0;
442                                 if (i == 0)
443                                         break;
444                                 if (act <= 0)
445                                         break;
446                                 if (i == 1)
447                                         tz->trips.active[0].temperature =
448                                                 CELSIUS_TO_KELVIN(act);
449                                 else
450                                         /*
451                                          * Don't allow override higher than
452                                          * the next higher trip point
453                                          */
454                                         tz->trips.active[i - 1].temperature =
455                                                 (tz->trips.active[i - 2].temperature <
456                                                 CELSIUS_TO_KELVIN(act) ?
457                                                 tz->trips.active[i - 2].temperature :
458                                                 CELSIUS_TO_KELVIN(act));
459                                 break;
460                         } else {
461                                 tz->trips.active[i].temperature = tmp;
462                                 tz->trips.active[i].flags.valid = 1;
463                         }
464                 }
465
466                 name[2] = 'L';
467                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
468                         memset(&devices, 0, sizeof(struct acpi_handle_list));
469                         status = acpi_evaluate_reference(tz->device->handle,
470                                                 name, NULL, &devices);
471                         if (ACPI_FAILURE(status)) {
472                                 printk(KERN_WARNING PREFIX
473                                         "Invalid active%d threshold\n", i);
474                                 tz->trips.active[i].flags.valid = 0;
475                         }
476                         else
477                                 tz->trips.active[i].flags.valid = 1;
478
479                         if (memcmp(&tz->trips.active[i].devices, &devices,
480                                         sizeof(struct acpi_handle_list))) {
481                                 memcpy(&tz->trips.active[i].devices, &devices,
482                                         sizeof(struct acpi_handle_list));
483                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
484                         }
485                 }
486                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
487                         if (valid != tz->trips.active[i].flags.valid)
488                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
489
490                 if (!tz->trips.active[i].flags.valid)
491                         break;
492         }
493
494         if (flag & ACPI_TRIPS_DEVICES) {
495                 memset(&devices, 0, sizeof(struct acpi_handle_list));
496                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
497                                                 NULL, &devices);
498                 if (memcmp(&tz->devices, &devices,
499                                 sizeof(struct acpi_handle_list))) {
500                         memcpy(&tz->devices, &devices,
501                                 sizeof(struct acpi_handle_list));
502                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
503                 }
504         }
505
506         return 0;
507 }
508
509 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
510 {
511         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
512
513         if (ret)
514                 return ret;
515
516         valid = tz->trips.critical.flags.valid |
517                 tz->trips.hot.flags.valid |
518                 tz->trips.passive.flags.valid;
519
520         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
521                 valid |= tz->trips.active[i].flags.valid;
522
523         if (!valid) {
524                 printk(KERN_WARNING FW_BUG "No valid trip found\n");
525                 return -ENODEV;
526         }
527         return 0;
528 }
529
530 static void acpi_thermal_check(void *data)
531 {
532         struct acpi_thermal *tz = data;
533
534         if (!tz->tz_enabled) {
535                 pr_warn("thermal zone is disabled \n");
536                 return;
537         }
538         thermal_zone_device_update(tz->thermal_zone);
539 }
540
541 /* sys I/F for generic thermal sysfs support */
542 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
543
544 static int thermal_get_temp(struct thermal_zone_device *thermal,
545                             unsigned long *temp)
546 {
547         struct acpi_thermal *tz = thermal->devdata;
548         int result;
549
550         if (!tz)
551                 return -EINVAL;
552
553         result = acpi_thermal_get_temperature(tz);
554         if (result)
555                 return result;
556
557         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
558         return 0;
559 }
560
561 static int thermal_get_mode(struct thermal_zone_device *thermal,
562                                 enum thermal_device_mode *mode)
563 {
564         struct acpi_thermal *tz = thermal->devdata;
565
566         if (!tz)
567                 return -EINVAL;
568
569         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
570                 THERMAL_DEVICE_DISABLED;
571
572         return 0;
573 }
574
575 static int thermal_set_mode(struct thermal_zone_device *thermal,
576                                 enum thermal_device_mode mode)
577 {
578         struct acpi_thermal *tz = thermal->devdata;
579         int enable;
580
581         if (!tz)
582                 return -EINVAL;
583
584         /*
585          * enable/disable thermal management from ACPI thermal driver
586          */
587         if (mode == THERMAL_DEVICE_ENABLED)
588                 enable = 1;
589         else if (mode == THERMAL_DEVICE_DISABLED)
590                 enable = 0;
591         else
592                 return -EINVAL;
593
594         if (enable != tz->tz_enabled) {
595                 tz->tz_enabled = enable;
596                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
597                         "%s kernel ACPI thermal control\n",
598                         tz->tz_enabled ? "Enable" : "Disable"));
599                 acpi_thermal_check(tz);
600         }
601         return 0;
602 }
603
604 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
605                                  int trip, enum thermal_trip_type *type)
606 {
607         struct acpi_thermal *tz = thermal->devdata;
608         int i;
609
610         if (!tz || trip < 0)
611                 return -EINVAL;
612
613         if (tz->trips.critical.flags.valid) {
614                 if (!trip) {
615                         *type = THERMAL_TRIP_CRITICAL;
616                         return 0;
617                 }
618                 trip--;
619         }
620
621         if (tz->trips.hot.flags.valid) {
622                 if (!trip) {
623                         *type = THERMAL_TRIP_HOT;
624                         return 0;
625                 }
626                 trip--;
627         }
628
629         if (tz->trips.passive.flags.valid) {
630                 if (!trip) {
631                         *type = THERMAL_TRIP_PASSIVE;
632                         return 0;
633                 }
634                 trip--;
635         }
636
637         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
638                 tz->trips.active[i].flags.valid; i++) {
639                 if (!trip) {
640                         *type = THERMAL_TRIP_ACTIVE;
641                         return 0;
642                 }
643                 trip--;
644         }
645
646         return -EINVAL;
647 }
648
649 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
650                                  int trip, unsigned long *temp)
651 {
652         struct acpi_thermal *tz = thermal->devdata;
653         int i;
654
655         if (!tz || trip < 0)
656                 return -EINVAL;
657
658         if (tz->trips.critical.flags.valid) {
659                 if (!trip) {
660                         *temp = KELVIN_TO_MILLICELSIUS(
661                                 tz->trips.critical.temperature,
662                                 tz->kelvin_offset);
663                         return 0;
664                 }
665                 trip--;
666         }
667
668         if (tz->trips.hot.flags.valid) {
669                 if (!trip) {
670                         *temp = KELVIN_TO_MILLICELSIUS(
671                                 tz->trips.hot.temperature,
672                                 tz->kelvin_offset);
673                         return 0;
674                 }
675                 trip--;
676         }
677
678         if (tz->trips.passive.flags.valid) {
679                 if (!trip) {
680                         *temp = KELVIN_TO_MILLICELSIUS(
681                                 tz->trips.passive.temperature,
682                                 tz->kelvin_offset);
683                         return 0;
684                 }
685                 trip--;
686         }
687
688         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
689                 tz->trips.active[i].flags.valid; i++) {
690                 if (!trip) {
691                         *temp = KELVIN_TO_MILLICELSIUS(
692                                 tz->trips.active[i].temperature,
693                                 tz->kelvin_offset);
694                         return 0;
695                 }
696                 trip--;
697         }
698
699         return -EINVAL;
700 }
701
702 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
703                                 unsigned long *temperature) {
704         struct acpi_thermal *tz = thermal->devdata;
705
706         if (tz->trips.critical.flags.valid) {
707                 *temperature = KELVIN_TO_MILLICELSIUS(
708                                 tz->trips.critical.temperature,
709                                 tz->kelvin_offset);
710                 return 0;
711         } else
712                 return -EINVAL;
713 }
714
715 static int thermal_get_trend(struct thermal_zone_device *thermal,
716                                 int trip, enum thermal_trend *trend)
717 {
718         struct acpi_thermal *tz = thermal->devdata;
719         enum thermal_trip_type type;
720         int i;
721
722         if (thermal_get_trip_type(thermal, trip, &type))
723                 return -EINVAL;
724
725         if (type == THERMAL_TRIP_ACTIVE) {
726                 unsigned long trip_temp;
727                 unsigned long temp = KELVIN_TO_MILLICELSIUS(tz->temperature,
728                                                         tz->kelvin_offset);
729                 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
730                         return -EINVAL;
731
732                 if (temp > trip_temp) {
733                         *trend = THERMAL_TREND_RAISING;
734                         return 0;
735                 } else {
736                         /* Fall back on default trend */
737                         return -EINVAL;
738                 }
739         }
740
741         /*
742          * tz->temperature has already been updated by generic thermal layer,
743          * before this callback being invoked
744          */
745         i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
746                 + (tz->trips.passive.tc2
747                 * (tz->temperature - tz->trips.passive.temperature));
748
749         if (i > 0)
750                 *trend = THERMAL_TREND_RAISING;
751         else if (i < 0)
752                 *trend = THERMAL_TREND_DROPPING;
753         else
754                 *trend = THERMAL_TREND_STABLE;
755         return 0;
756 }
757
758
759 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
760                            enum thermal_trip_type trip_type)
761 {
762         u8 type = 0;
763         struct acpi_thermal *tz = thermal->devdata;
764
765         if (trip_type == THERMAL_TRIP_CRITICAL)
766                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
767         else if (trip_type == THERMAL_TRIP_HOT)
768                 type = ACPI_THERMAL_NOTIFY_HOT;
769         else
770                 return 0;
771
772         acpi_bus_generate_proc_event(tz->device, type, 1);
773         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
774                                         dev_name(&tz->device->dev), type, 1);
775
776         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
777                 return 1;
778
779         return 0;
780 }
781
782 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
783                                         struct thermal_cooling_device *cdev,
784                                         bool bind)
785 {
786         struct acpi_device *device = cdev->devdata;
787         struct acpi_thermal *tz = thermal->devdata;
788         struct acpi_device *dev;
789         acpi_status status;
790         acpi_handle handle;
791         int i;
792         int j;
793         int trip = -1;
794         int result = 0;
795
796         if (tz->trips.critical.flags.valid)
797                 trip++;
798
799         if (tz->trips.hot.flags.valid)
800                 trip++;
801
802         if (tz->trips.passive.flags.valid) {
803                 trip++;
804                 for (i = 0; i < tz->trips.passive.devices.count;
805                     i++) {
806                         handle = tz->trips.passive.devices.handles[i];
807                         status = acpi_bus_get_device(handle, &dev);
808                         if (ACPI_FAILURE(status) || dev != device)
809                                 continue;
810                         if (bind)
811                                 result =
812                                         thermal_zone_bind_cooling_device
813                                         (thermal, trip, cdev,
814                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
815                         else
816                                 result =
817                                         thermal_zone_unbind_cooling_device
818                                         (thermal, trip, cdev);
819                         if (result)
820                                 goto failed;
821                 }
822         }
823
824         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
825                 if (!tz->trips.active[i].flags.valid)
826                         break;
827                 trip++;
828                 for (j = 0;
829                     j < tz->trips.active[i].devices.count;
830                     j++) {
831                         handle = tz->trips.active[i].devices.handles[j];
832                         status = acpi_bus_get_device(handle, &dev);
833                         if (ACPI_FAILURE(status) || dev != device)
834                                 continue;
835                         if (bind)
836                                 result = thermal_zone_bind_cooling_device
837                                         (thermal, trip, cdev,
838                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
839                         else
840                                 result = thermal_zone_unbind_cooling_device
841                                         (thermal, trip, cdev);
842                         if (result)
843                                 goto failed;
844                 }
845         }
846
847         for (i = 0; i < tz->devices.count; i++) {
848                 handle = tz->devices.handles[i];
849                 status = acpi_bus_get_device(handle, &dev);
850                 if (ACPI_SUCCESS(status) && (dev == device)) {
851                         if (bind)
852                                 result = thermal_zone_bind_cooling_device
853                                                 (thermal, -1, cdev,
854                                                  THERMAL_NO_LIMIT,
855                                                  THERMAL_NO_LIMIT);
856                         else
857                                 result = thermal_zone_unbind_cooling_device
858                                                 (thermal, -1, cdev);
859                         if (result)
860                                 goto failed;
861                 }
862         }
863
864 failed:
865         return result;
866 }
867
868 static int
869 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
870                                         struct thermal_cooling_device *cdev)
871 {
872         return acpi_thermal_cooling_device_cb(thermal, cdev, true);
873 }
874
875 static int
876 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
877                                         struct thermal_cooling_device *cdev)
878 {
879         return acpi_thermal_cooling_device_cb(thermal, cdev, false);
880 }
881
882 static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
883         .bind = acpi_thermal_bind_cooling_device,
884         .unbind = acpi_thermal_unbind_cooling_device,
885         .get_temp = thermal_get_temp,
886         .get_mode = thermal_get_mode,
887         .set_mode = thermal_set_mode,
888         .get_trip_type = thermal_get_trip_type,
889         .get_trip_temp = thermal_get_trip_temp,
890         .get_crit_temp = thermal_get_crit_temp,
891         .get_trend = thermal_get_trend,
892         .notify = thermal_notify,
893 };
894
895 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
896 {
897         int trips = 0;
898         int result;
899         acpi_status status;
900         int i;
901
902         if (tz->trips.critical.flags.valid)
903                 trips++;
904
905         if (tz->trips.hot.flags.valid)
906                 trips++;
907
908         if (tz->trips.passive.flags.valid)
909                 trips++;
910
911         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
912                         tz->trips.active[i].flags.valid; i++, trips++);
913
914         if (tz->trips.passive.flags.valid)
915                 tz->thermal_zone =
916                         thermal_zone_device_register("acpitz", trips, 0, tz,
917                                                 &acpi_thermal_zone_ops, NULL,
918                                                      tz->trips.passive.tsp*100,
919                                                      tz->polling_frequency*100);
920         else
921                 tz->thermal_zone =
922                         thermal_zone_device_register("acpitz", trips, 0, tz,
923                                                 &acpi_thermal_zone_ops, NULL,
924                                                 0, tz->polling_frequency*100);
925         if (IS_ERR(tz->thermal_zone))
926                 return -ENODEV;
927
928         result = sysfs_create_link(&tz->device->dev.kobj,
929                                    &tz->thermal_zone->device.kobj, "thermal_zone");
930         if (result)
931                 return result;
932
933         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
934                                    &tz->device->dev.kobj, "device");
935         if (result)
936                 return result;
937
938         status = acpi_attach_data(tz->device->handle,
939                                   acpi_bus_private_data_handler,
940                                   tz->thermal_zone);
941         if (ACPI_FAILURE(status)) {
942                 printk(KERN_ERR PREFIX
943                                 "Error attaching device data\n");
944                 return -ENODEV;
945         }
946
947         tz->tz_enabled = 1;
948
949         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
950                  tz->thermal_zone->id);
951         return 0;
952 }
953
954 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
955 {
956         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
957         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
958         thermal_zone_device_unregister(tz->thermal_zone);
959         tz->thermal_zone = NULL;
960         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
961 }
962
963
964 /* --------------------------------------------------------------------------
965                                  Driver Interface
966    -------------------------------------------------------------------------- */
967
968 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
969 {
970         struct acpi_thermal *tz = acpi_driver_data(device);
971
972
973         if (!tz)
974                 return;
975
976         switch (event) {
977         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
978                 acpi_thermal_check(tz);
979                 break;
980         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
981                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
982                 acpi_thermal_check(tz);
983                 acpi_bus_generate_proc_event(device, event, 0);
984                 acpi_bus_generate_netlink_event(device->pnp.device_class,
985                                                   dev_name(&device->dev), event, 0);
986                 break;
987         case ACPI_THERMAL_NOTIFY_DEVICES:
988                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
989                 acpi_thermal_check(tz);
990                 acpi_bus_generate_proc_event(device, event, 0);
991                 acpi_bus_generate_netlink_event(device->pnp.device_class,
992                                                   dev_name(&device->dev), event, 0);
993                 break;
994         default:
995                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
996                                   "Unsupported event [0x%x]\n", event));
997                 break;
998         }
999 }
1000
1001 /*
1002  * On some platforms, the AML code has dependency about
1003  * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
1004  * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
1005  *    /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
1006  * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
1007  *    if _TMP has never been evaluated.
1008  *
1009  * As this dependency is totally transparent to OS, evaluate
1010  * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
1011  * _TMP, before they are actually used.
1012  */
1013 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
1014 {
1015         acpi_handle handle = tz->device->handle;
1016         unsigned long long value;
1017         int i;
1018
1019         acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1020         acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1021         acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1022         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1023                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1024                 acpi_status status;
1025
1026                 status = acpi_evaluate_integer(handle, name, NULL, &value);
1027                 if (status == AE_NOT_FOUND)
1028                         break;
1029         }
1030         acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1031 }
1032
1033 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1034 {
1035         int result = 0;
1036
1037
1038         if (!tz)
1039                 return -EINVAL;
1040
1041         acpi_thermal_aml_dependency_fix(tz);
1042
1043         /* Get trip points [_CRT, _PSV, etc.] (required) */
1044         result = acpi_thermal_get_trip_points(tz);
1045         if (result)
1046                 return result;
1047
1048         /* Get temperature [_TMP] (required) */
1049         result = acpi_thermal_get_temperature(tz);
1050         if (result)
1051                 return result;
1052
1053         /* Set the cooling mode [_SCP] to active cooling (default) */
1054         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1055         if (!result)
1056                 tz->flags.cooling_mode = 1;
1057
1058         /* Get default polling frequency [_TZP] (optional) */
1059         if (tzp)
1060                 tz->polling_frequency = tzp;
1061         else
1062                 acpi_thermal_get_polling_frequency(tz);
1063
1064         return 0;
1065 }
1066
1067 /*
1068  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1069  * handles temperature values with a single decimal place. As a consequence,
1070  * some implementations use an offset of 273.1 and others use an offset of
1071  * 273.2. Try to find out which one is being used, to present the most
1072  * accurate and visually appealing number.
1073  *
1074  * The heuristic below should work for all ACPI thermal zones which have a
1075  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1076  */
1077 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1078 {
1079         if (tz->trips.critical.flags.valid &&
1080             (tz->trips.critical.temperature % 5) == 1)
1081                 tz->kelvin_offset = 2731;
1082         else
1083                 tz->kelvin_offset = 2732;
1084 }
1085
1086 static int acpi_thermal_add(struct acpi_device *device)
1087 {
1088         int result = 0;
1089         struct acpi_thermal *tz = NULL;
1090
1091
1092         if (!device)
1093                 return -EINVAL;
1094
1095         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1096         if (!tz)
1097                 return -ENOMEM;
1098
1099         tz->device = device;
1100         strcpy(tz->name, device->pnp.bus_id);
1101         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1102         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1103         device->driver_data = tz;
1104         mutex_init(&tz->lock);
1105
1106
1107         result = acpi_thermal_get_info(tz);
1108         if (result)
1109                 goto free_memory;
1110
1111         acpi_thermal_guess_offset(tz);
1112
1113         result = acpi_thermal_register_thermal_zone(tz);
1114         if (result)
1115                 goto free_memory;
1116
1117         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1118                acpi_device_name(device), acpi_device_bid(device),
1119                KELVIN_TO_CELSIUS(tz->temperature));
1120         goto end;
1121
1122 free_memory:
1123         kfree(tz);
1124 end:
1125         return result;
1126 }
1127
1128 static int acpi_thermal_remove(struct acpi_device *device)
1129 {
1130         struct acpi_thermal *tz = NULL;
1131
1132         if (!device || !acpi_driver_data(device))
1133                 return -EINVAL;
1134
1135         tz = acpi_driver_data(device);
1136
1137         acpi_thermal_unregister_thermal_zone(tz);
1138         mutex_destroy(&tz->lock);
1139         kfree(tz);
1140         return 0;
1141 }
1142
1143 #ifdef CONFIG_PM_SLEEP
1144 static int acpi_thermal_resume(struct device *dev)
1145 {
1146         struct acpi_thermal *tz;
1147         int i, j, power_state, result;
1148
1149         if (!dev)
1150                 return -EINVAL;
1151
1152         tz = acpi_driver_data(to_acpi_device(dev));
1153         if (!tz)
1154                 return -EINVAL;
1155
1156         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1157                 if (!(&tz->trips.active[i]))
1158                         break;
1159                 if (!tz->trips.active[i].flags.valid)
1160                         break;
1161                 tz->trips.active[i].flags.enabled = 1;
1162                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1163                         result = acpi_bus_update_power(
1164                                         tz->trips.active[i].devices.handles[j],
1165                                         &power_state);
1166                         if (result || (power_state != ACPI_STATE_D0)) {
1167                                 tz->trips.active[i].flags.enabled = 0;
1168                                 break;
1169                         }
1170                 }
1171                 tz->state.active |= tz->trips.active[i].flags.enabled;
1172         }
1173
1174         acpi_thermal_check(tz);
1175
1176         return AE_OK;
1177 }
1178 #endif
1179
1180 static int thermal_act(const struct dmi_system_id *d) {
1181
1182         if (act == 0) {
1183                 printk(KERN_NOTICE "ACPI: %s detected: "
1184                         "disabling all active thermal trip points\n", d->ident);
1185                 act = -1;
1186         }
1187         return 0;
1188 }
1189 static int thermal_nocrt(const struct dmi_system_id *d) {
1190
1191         printk(KERN_NOTICE "ACPI: %s detected: "
1192                 "disabling all critical thermal trip point actions.\n", d->ident);
1193         nocrt = 1;
1194         return 0;
1195 }
1196 static int thermal_tzp(const struct dmi_system_id *d) {
1197
1198         if (tzp == 0) {
1199                 printk(KERN_NOTICE "ACPI: %s detected: "
1200                         "enabling thermal zone polling\n", d->ident);
1201                 tzp = 300;      /* 300 dS = 30 Seconds */
1202         }
1203         return 0;
1204 }
1205 static int thermal_psv(const struct dmi_system_id *d) {
1206
1207         if (psv == 0) {
1208                 printk(KERN_NOTICE "ACPI: %s detected: "
1209                         "disabling all passive thermal trip points\n", d->ident);
1210                 psv = -1;
1211         }
1212         return 0;
1213 }
1214
1215 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1216         /*
1217          * Award BIOS on this AOpen makes thermal control almost worthless.
1218          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1219          */
1220         {
1221          .callback = thermal_act,
1222          .ident = "AOpen i915GMm-HFS",
1223          .matches = {
1224                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1225                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1226                 },
1227         },
1228         {
1229          .callback = thermal_psv,
1230          .ident = "AOpen i915GMm-HFS",
1231          .matches = {
1232                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1233                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1234                 },
1235         },
1236         {
1237          .callback = thermal_tzp,
1238          .ident = "AOpen i915GMm-HFS",
1239          .matches = {
1240                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1241                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1242                 },
1243         },
1244         {
1245          .callback = thermal_nocrt,
1246          .ident = "Gigabyte GA-7ZX",
1247          .matches = {
1248                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1249                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1250                 },
1251         },
1252         {}
1253 };
1254
1255 static int __init acpi_thermal_init(void)
1256 {
1257         int result = 0;
1258
1259         dmi_check_system(thermal_dmi_table);
1260
1261         if (off) {
1262                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1263                 return -ENODEV;
1264         }
1265
1266         result = acpi_bus_register_driver(&acpi_thermal_driver);
1267         if (result < 0)
1268                 return -ENODEV;
1269
1270         return 0;
1271 }
1272
1273 static void __exit acpi_thermal_exit(void)
1274 {
1275
1276         acpi_bus_unregister_driver(&acpi_thermal_driver);
1277
1278         return;
1279 }
1280
1281 module_init(acpi_thermal_init);
1282 module_exit(acpi_thermal_exit);