ACPI / scan: Remove unnecessary initialization of local variables
[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, int type);
101 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
102
103 static const struct acpi_device_id  thermal_device_ids[] = {
104         {ACPI_THERMAL_HID, 0},
105         {"", 0},
106 };
107 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
108
109 #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\n", 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         thermal_zone_device_update(tz->thermal_zone);
535 }
536
537 /* sys I/F for generic thermal sysfs support */
538 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
539
540 static int thermal_get_temp(struct thermal_zone_device *thermal,
541                             unsigned long *temp)
542 {
543         struct acpi_thermal *tz = thermal->devdata;
544         int result;
545
546         if (!tz)
547                 return -EINVAL;
548
549         result = acpi_thermal_get_temperature(tz);
550         if (result)
551                 return result;
552
553         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
554         return 0;
555 }
556
557 static int thermal_get_mode(struct thermal_zone_device *thermal,
558                                 enum thermal_device_mode *mode)
559 {
560         struct acpi_thermal *tz = thermal->devdata;
561
562         if (!tz)
563                 return -EINVAL;
564
565         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
566                 THERMAL_DEVICE_DISABLED;
567
568         return 0;
569 }
570
571 static int thermal_set_mode(struct thermal_zone_device *thermal,
572                                 enum thermal_device_mode mode)
573 {
574         struct acpi_thermal *tz = thermal->devdata;
575         int enable;
576
577         if (!tz)
578                 return -EINVAL;
579
580         /*
581          * enable/disable thermal management from ACPI thermal driver
582          */
583         if (mode == THERMAL_DEVICE_ENABLED)
584                 enable = 1;
585         else if (mode == THERMAL_DEVICE_DISABLED)
586                 enable = 0;
587         else
588                 return -EINVAL;
589
590         if (enable != tz->tz_enabled) {
591                 tz->tz_enabled = enable;
592                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
593                         "%s kernel ACPI thermal control\n",
594                         tz->tz_enabled ? "Enable" : "Disable"));
595                 acpi_thermal_check(tz);
596         }
597         return 0;
598 }
599
600 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
601                                  int trip, enum thermal_trip_type *type)
602 {
603         struct acpi_thermal *tz = thermal->devdata;
604         int i;
605
606         if (!tz || trip < 0)
607                 return -EINVAL;
608
609         if (tz->trips.critical.flags.valid) {
610                 if (!trip) {
611                         *type = THERMAL_TRIP_CRITICAL;
612                         return 0;
613                 }
614                 trip--;
615         }
616
617         if (tz->trips.hot.flags.valid) {
618                 if (!trip) {
619                         *type = THERMAL_TRIP_HOT;
620                         return 0;
621                 }
622                 trip--;
623         }
624
625         if (tz->trips.passive.flags.valid) {
626                 if (!trip) {
627                         *type = THERMAL_TRIP_PASSIVE;
628                         return 0;
629                 }
630                 trip--;
631         }
632
633         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
634                 tz->trips.active[i].flags.valid; i++) {
635                 if (!trip) {
636                         *type = THERMAL_TRIP_ACTIVE;
637                         return 0;
638                 }
639                 trip--;
640         }
641
642         return -EINVAL;
643 }
644
645 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
646                                  int trip, unsigned long *temp)
647 {
648         struct acpi_thermal *tz = thermal->devdata;
649         int i;
650
651         if (!tz || trip < 0)
652                 return -EINVAL;
653
654         if (tz->trips.critical.flags.valid) {
655                 if (!trip) {
656                         *temp = KELVIN_TO_MILLICELSIUS(
657                                 tz->trips.critical.temperature,
658                                 tz->kelvin_offset);
659                         return 0;
660                 }
661                 trip--;
662         }
663
664         if (tz->trips.hot.flags.valid) {
665                 if (!trip) {
666                         *temp = KELVIN_TO_MILLICELSIUS(
667                                 tz->trips.hot.temperature,
668                                 tz->kelvin_offset);
669                         return 0;
670                 }
671                 trip--;
672         }
673
674         if (tz->trips.passive.flags.valid) {
675                 if (!trip) {
676                         *temp = KELVIN_TO_MILLICELSIUS(
677                                 tz->trips.passive.temperature,
678                                 tz->kelvin_offset);
679                         return 0;
680                 }
681                 trip--;
682         }
683
684         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
685                 tz->trips.active[i].flags.valid; i++) {
686                 if (!trip) {
687                         *temp = KELVIN_TO_MILLICELSIUS(
688                                 tz->trips.active[i].temperature,
689                                 tz->kelvin_offset);
690                         return 0;
691                 }
692                 trip--;
693         }
694
695         return -EINVAL;
696 }
697
698 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
699                                 unsigned long *temperature) {
700         struct acpi_thermal *tz = thermal->devdata;
701
702         if (tz->trips.critical.flags.valid) {
703                 *temperature = KELVIN_TO_MILLICELSIUS(
704                                 tz->trips.critical.temperature,
705                                 tz->kelvin_offset);
706                 return 0;
707         } else
708                 return -EINVAL;
709 }
710
711 static int thermal_get_trend(struct thermal_zone_device *thermal,
712                                 int trip, enum thermal_trend *trend)
713 {
714         struct acpi_thermal *tz = thermal->devdata;
715         enum thermal_trip_type type;
716         int i;
717
718         if (thermal_get_trip_type(thermal, trip, &type))
719                 return -EINVAL;
720
721         if (type == THERMAL_TRIP_ACTIVE) {
722                 /* aggressive active cooling */
723                 *trend = THERMAL_TREND_RAISING;
724                 return 0;
725         }
726
727         /*
728          * tz->temperature has already been updated by generic thermal layer,
729          * before this callback being invoked
730          */
731         i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
732                 + (tz->trips.passive.tc2
733                 * (tz->temperature - tz->trips.passive.temperature));
734
735         if (i > 0)
736                 *trend = THERMAL_TREND_RAISING;
737         else if (i < 0)
738                 *trend = THERMAL_TREND_DROPPING;
739         else
740                 *trend = THERMAL_TREND_STABLE;
741         return 0;
742 }
743
744
745 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
746                            enum thermal_trip_type trip_type)
747 {
748         u8 type = 0;
749         struct acpi_thermal *tz = thermal->devdata;
750
751         if (trip_type == THERMAL_TRIP_CRITICAL)
752                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
753         else if (trip_type == THERMAL_TRIP_HOT)
754                 type = ACPI_THERMAL_NOTIFY_HOT;
755         else
756                 return 0;
757
758         acpi_bus_generate_proc_event(tz->device, type, 1);
759         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
760                                         dev_name(&tz->device->dev), type, 1);
761
762         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
763                 return 1;
764
765         return 0;
766 }
767
768 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
769                                         struct thermal_cooling_device *cdev,
770                                         bool bind)
771 {
772         struct acpi_device *device = cdev->devdata;
773         struct acpi_thermal *tz = thermal->devdata;
774         struct acpi_device *dev;
775         acpi_status status;
776         acpi_handle handle;
777         int i;
778         int j;
779         int trip = -1;
780         int result = 0;
781
782         if (tz->trips.critical.flags.valid)
783                 trip++;
784
785         if (tz->trips.hot.flags.valid)
786                 trip++;
787
788         if (tz->trips.passive.flags.valid) {
789                 trip++;
790                 for (i = 0; i < tz->trips.passive.devices.count;
791                     i++) {
792                         handle = tz->trips.passive.devices.handles[i];
793                         status = acpi_bus_get_device(handle, &dev);
794                         if (ACPI_FAILURE(status) || dev != device)
795                                 continue;
796                         if (bind)
797                                 result =
798                                         thermal_zone_bind_cooling_device
799                                         (thermal, trip, cdev,
800                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
801                         else
802                                 result =
803                                         thermal_zone_unbind_cooling_device
804                                         (thermal, trip, cdev);
805                         if (result)
806                                 goto failed;
807                 }
808         }
809
810         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
811                 if (!tz->trips.active[i].flags.valid)
812                         break;
813                 trip++;
814                 for (j = 0;
815                     j < tz->trips.active[i].devices.count;
816                     j++) {
817                         handle = tz->trips.active[i].devices.handles[j];
818                         status = acpi_bus_get_device(handle, &dev);
819                         if (ACPI_FAILURE(status) || dev != device)
820                                 continue;
821                         if (bind)
822                                 result = thermal_zone_bind_cooling_device
823                                         (thermal, trip, cdev,
824                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
825                         else
826                                 result = thermal_zone_unbind_cooling_device
827                                         (thermal, trip, cdev);
828                         if (result)
829                                 goto failed;
830                 }
831         }
832
833         for (i = 0; i < tz->devices.count; i++) {
834                 handle = tz->devices.handles[i];
835                 status = acpi_bus_get_device(handle, &dev);
836                 if (ACPI_SUCCESS(status) && (dev == device)) {
837                         if (bind)
838                                 result = thermal_zone_bind_cooling_device
839                                                 (thermal, -1, cdev,
840                                                  THERMAL_NO_LIMIT,
841                                                  THERMAL_NO_LIMIT);
842                         else
843                                 result = thermal_zone_unbind_cooling_device
844                                                 (thermal, -1, cdev);
845                         if (result)
846                                 goto failed;
847                 }
848         }
849
850 failed:
851         return result;
852 }
853
854 static int
855 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
856                                         struct thermal_cooling_device *cdev)
857 {
858         return acpi_thermal_cooling_device_cb(thermal, cdev, true);
859 }
860
861 static int
862 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
863                                         struct thermal_cooling_device *cdev)
864 {
865         return acpi_thermal_cooling_device_cb(thermal, cdev, false);
866 }
867
868 static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
869         .bind = acpi_thermal_bind_cooling_device,
870         .unbind = acpi_thermal_unbind_cooling_device,
871         .get_temp = thermal_get_temp,
872         .get_mode = thermal_get_mode,
873         .set_mode = thermal_set_mode,
874         .get_trip_type = thermal_get_trip_type,
875         .get_trip_temp = thermal_get_trip_temp,
876         .get_crit_temp = thermal_get_crit_temp,
877         .get_trend = thermal_get_trend,
878         .notify = thermal_notify,
879 };
880
881 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
882 {
883         int trips = 0;
884         int result;
885         acpi_status status;
886         int i;
887
888         if (tz->trips.critical.flags.valid)
889                 trips++;
890
891         if (tz->trips.hot.flags.valid)
892                 trips++;
893
894         if (tz->trips.passive.flags.valid)
895                 trips++;
896
897         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
898                         tz->trips.active[i].flags.valid; i++, trips++);
899
900         if (tz->trips.passive.flags.valid)
901                 tz->thermal_zone =
902                         thermal_zone_device_register("acpitz", trips, 0, tz,
903                                                 &acpi_thermal_zone_ops, NULL,
904                                                      tz->trips.passive.tsp*100,
905                                                      tz->polling_frequency*100);
906         else
907                 tz->thermal_zone =
908                         thermal_zone_device_register("acpitz", trips, 0, tz,
909                                                 &acpi_thermal_zone_ops, NULL,
910                                                 0, tz->polling_frequency*100);
911         if (IS_ERR(tz->thermal_zone))
912                 return -ENODEV;
913
914         result = sysfs_create_link(&tz->device->dev.kobj,
915                                    &tz->thermal_zone->device.kobj, "thermal_zone");
916         if (result)
917                 return result;
918
919         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
920                                    &tz->device->dev.kobj, "device");
921         if (result)
922                 return result;
923
924         status = acpi_attach_data(tz->device->handle,
925                                   acpi_bus_private_data_handler,
926                                   tz->thermal_zone);
927         if (ACPI_FAILURE(status)) {
928                 printk(KERN_ERR PREFIX
929                                 "Error attaching device data\n");
930                 return -ENODEV;
931         }
932
933         tz->tz_enabled = 1;
934
935         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
936                  tz->thermal_zone->id);
937         return 0;
938 }
939
940 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
941 {
942         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
943         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
944         thermal_zone_device_unregister(tz->thermal_zone);
945         tz->thermal_zone = NULL;
946         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
947 }
948
949
950 /* --------------------------------------------------------------------------
951                                  Driver Interface
952    -------------------------------------------------------------------------- */
953
954 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
955 {
956         struct acpi_thermal *tz = acpi_driver_data(device);
957
958
959         if (!tz)
960                 return;
961
962         switch (event) {
963         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
964                 acpi_thermal_check(tz);
965                 break;
966         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
967                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
968                 acpi_thermal_check(tz);
969                 acpi_bus_generate_proc_event(device, event, 0);
970                 acpi_bus_generate_netlink_event(device->pnp.device_class,
971                                                   dev_name(&device->dev), event, 0);
972                 break;
973         case ACPI_THERMAL_NOTIFY_DEVICES:
974                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
975                 acpi_thermal_check(tz);
976                 acpi_bus_generate_proc_event(device, event, 0);
977                 acpi_bus_generate_netlink_event(device->pnp.device_class,
978                                                   dev_name(&device->dev), event, 0);
979                 break;
980         default:
981                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
982                                   "Unsupported event [0x%x]\n", event));
983                 break;
984         }
985 }
986
987 /*
988  * On some platforms, the AML code has dependency about
989  * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
990  * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
991  *    /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
992  * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
993  *    if _TMP has never been evaluated.
994  *
995  * As this dependency is totally transparent to OS, evaluate
996  * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
997  * _TMP, before they are actually used.
998  */
999 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
1000 {
1001         acpi_handle handle = tz->device->handle;
1002         unsigned long long value;
1003         int i;
1004
1005         acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1006         acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1007         acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1008         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1009                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1010                 acpi_status status;
1011
1012                 status = acpi_evaluate_integer(handle, name, NULL, &value);
1013                 if (status == AE_NOT_FOUND)
1014                         break;
1015         }
1016         acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1017 }
1018
1019 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1020 {
1021         int result = 0;
1022
1023
1024         if (!tz)
1025                 return -EINVAL;
1026
1027         acpi_thermal_aml_dependency_fix(tz);
1028
1029         /* Get trip points [_CRT, _PSV, etc.] (required) */
1030         result = acpi_thermal_get_trip_points(tz);
1031         if (result)
1032                 return result;
1033
1034         /* Get temperature [_TMP] (required) */
1035         result = acpi_thermal_get_temperature(tz);
1036         if (result)
1037                 return result;
1038
1039         /* Set the cooling mode [_SCP] to active cooling (default) */
1040         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1041         if (!result)
1042                 tz->flags.cooling_mode = 1;
1043
1044         /* Get default polling frequency [_TZP] (optional) */
1045         if (tzp)
1046                 tz->polling_frequency = tzp;
1047         else
1048                 acpi_thermal_get_polling_frequency(tz);
1049
1050         return 0;
1051 }
1052
1053 /*
1054  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1055  * handles temperature values with a single decimal place. As a consequence,
1056  * some implementations use an offset of 273.1 and others use an offset of
1057  * 273.2. Try to find out which one is being used, to present the most
1058  * accurate and visually appealing number.
1059  *
1060  * The heuristic below should work for all ACPI thermal zones which have a
1061  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1062  */
1063 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1064 {
1065         if (tz->trips.critical.flags.valid &&
1066             (tz->trips.critical.temperature % 5) == 1)
1067                 tz->kelvin_offset = 2731;
1068         else
1069                 tz->kelvin_offset = 2732;
1070 }
1071
1072 static int acpi_thermal_add(struct acpi_device *device)
1073 {
1074         int result = 0;
1075         struct acpi_thermal *tz = NULL;
1076
1077
1078         if (!device)
1079                 return -EINVAL;
1080
1081         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1082         if (!tz)
1083                 return -ENOMEM;
1084
1085         tz->device = device;
1086         strcpy(tz->name, device->pnp.bus_id);
1087         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1088         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1089         device->driver_data = tz;
1090         mutex_init(&tz->lock);
1091
1092
1093         result = acpi_thermal_get_info(tz);
1094         if (result)
1095                 goto free_memory;
1096
1097         acpi_thermal_guess_offset(tz);
1098
1099         result = acpi_thermal_register_thermal_zone(tz);
1100         if (result)
1101                 goto free_memory;
1102
1103         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1104                acpi_device_name(device), acpi_device_bid(device),
1105                KELVIN_TO_CELSIUS(tz->temperature));
1106         goto end;
1107
1108 free_memory:
1109         kfree(tz);
1110 end:
1111         return result;
1112 }
1113
1114 static int acpi_thermal_remove(struct acpi_device *device, int type)
1115 {
1116         struct acpi_thermal *tz = NULL;
1117
1118         if (!device || !acpi_driver_data(device))
1119                 return -EINVAL;
1120
1121         tz = acpi_driver_data(device);
1122
1123         acpi_thermal_unregister_thermal_zone(tz);
1124         mutex_destroy(&tz->lock);
1125         kfree(tz);
1126         return 0;
1127 }
1128
1129 #ifdef CONFIG_PM_SLEEP
1130 static int acpi_thermal_resume(struct device *dev)
1131 {
1132         struct acpi_thermal *tz;
1133         int i, j, power_state, result;
1134
1135         if (!dev)
1136                 return -EINVAL;
1137
1138         tz = acpi_driver_data(to_acpi_device(dev));
1139         if (!tz)
1140                 return -EINVAL;
1141
1142         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1143                 if (!(&tz->trips.active[i]))
1144                         break;
1145                 if (!tz->trips.active[i].flags.valid)
1146                         break;
1147                 tz->trips.active[i].flags.enabled = 1;
1148                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1149                         result = acpi_bus_update_power(
1150                                         tz->trips.active[i].devices.handles[j],
1151                                         &power_state);
1152                         if (result || (power_state != ACPI_STATE_D0)) {
1153                                 tz->trips.active[i].flags.enabled = 0;
1154                                 break;
1155                         }
1156                 }
1157                 tz->state.active |= tz->trips.active[i].flags.enabled;
1158         }
1159
1160         acpi_thermal_check(tz);
1161
1162         return AE_OK;
1163 }
1164 #endif
1165
1166 static int thermal_act(const struct dmi_system_id *d) {
1167
1168         if (act == 0) {
1169                 printk(KERN_NOTICE "ACPI: %s detected: "
1170                         "disabling all active thermal trip points\n", d->ident);
1171                 act = -1;
1172         }
1173         return 0;
1174 }
1175 static int thermal_nocrt(const struct dmi_system_id *d) {
1176
1177         printk(KERN_NOTICE "ACPI: %s detected: "
1178                 "disabling all critical thermal trip point actions.\n", d->ident);
1179         nocrt = 1;
1180         return 0;
1181 }
1182 static int thermal_tzp(const struct dmi_system_id *d) {
1183
1184         if (tzp == 0) {
1185                 printk(KERN_NOTICE "ACPI: %s detected: "
1186                         "enabling thermal zone polling\n", d->ident);
1187                 tzp = 300;      /* 300 dS = 30 Seconds */
1188         }
1189         return 0;
1190 }
1191 static int thermal_psv(const struct dmi_system_id *d) {
1192
1193         if (psv == 0) {
1194                 printk(KERN_NOTICE "ACPI: %s detected: "
1195                         "disabling all passive thermal trip points\n", d->ident);
1196                 psv = -1;
1197         }
1198         return 0;
1199 }
1200
1201 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1202         /*
1203          * Award BIOS on this AOpen makes thermal control almost worthless.
1204          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1205          */
1206         {
1207          .callback = thermal_act,
1208          .ident = "AOpen i915GMm-HFS",
1209          .matches = {
1210                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1211                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1212                 },
1213         },
1214         {
1215          .callback = thermal_psv,
1216          .ident = "AOpen i915GMm-HFS",
1217          .matches = {
1218                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1219                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1220                 },
1221         },
1222         {
1223          .callback = thermal_tzp,
1224          .ident = "AOpen i915GMm-HFS",
1225          .matches = {
1226                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1227                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1228                 },
1229         },
1230         {
1231          .callback = thermal_nocrt,
1232          .ident = "Gigabyte GA-7ZX",
1233          .matches = {
1234                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1235                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1236                 },
1237         },
1238         {}
1239 };
1240
1241 static int __init acpi_thermal_init(void)
1242 {
1243         int result = 0;
1244
1245         dmi_check_system(thermal_dmi_table);
1246
1247         if (off) {
1248                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1249                 return -ENODEV;
1250         }
1251
1252         result = acpi_bus_register_driver(&acpi_thermal_driver);
1253         if (result < 0)
1254                 return -ENODEV;
1255
1256         return 0;
1257 }
1258
1259 static void __exit acpi_thermal_exit(void)
1260 {
1261
1262         acpi_bus_unregister_driver(&acpi_thermal_driver);
1263
1264         return;
1265 }
1266
1267 module_init(acpi_thermal_init);
1268 module_exit(acpi_thermal_exit);