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Linux/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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 20  *
 21  *  This driver fully implements the ACPI thermal policy as described in the
 22  *  ACPI 2.0 Specification.
 23  *
 24  *  TBD: 1. Implement passive cooling hysteresis.
 25  *       2. Enhance passive cooling (CPU) states/limit interface to support
 26  *          concepts of 'multiple limiters', upper/lower limits, etc.
 27  *
 28  */
 29 
 30 #include <linux/kernel.h>
 31 #include <linux/module.h>
 32 #include <linux/dmi.h>
 33 #include <linux/init.h>
 34 #include <linux/slab.h>
 35 #include <linux/types.h>
 36 #include <linux/jiffies.h>
 37 #include <linux/kmod.h>
 38 #include <linux/reboot.h>
 39 #include <linux/device.h>
 40 #include <linux/thermal.h>
 41 #include <linux/acpi.h>
 42 #include <linux/workqueue.h>
 43 #include <asm/uaccess.h>
 44 
 45 #define PREFIX "ACPI: "
 46 
 47 #define ACPI_THERMAL_CLASS              "thermal_zone"
 48 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
 49 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
 50 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
 51 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
 52 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
 53 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
 54 #define ACPI_THERMAL_MODE_ACTIVE        0x00
 55 
 56 #define ACPI_THERMAL_MAX_ACTIVE 10
 57 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
 58 
 59 #define _COMPONENT              ACPI_THERMAL_COMPONENT
 60 ACPI_MODULE_NAME("thermal");
 61 
 62 MODULE_AUTHOR("Paul Diefenbaugh");
 63 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
 64 MODULE_LICENSE("GPL");
 65 
 66 static int act;
 67 module_param(act, int, 0644);
 68 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
 69 
 70 static int crt;
 71 module_param(crt, int, 0644);
 72 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
 73 
 74 static int tzp;
 75 module_param(tzp, int, 0444);
 76 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
 77 
 78 static int nocrt;
 79 module_param(nocrt, int, 0);
 80 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
 81 
 82 static int off;
 83 module_param(off, int, 0);
 84 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
 85 
 86 static int psv;
 87 module_param(psv, int, 0644);
 88 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
 89 
 90 static struct workqueue_struct *acpi_thermal_pm_queue;
 91 
 92 static int acpi_thermal_add(struct acpi_device *device);
 93 static int acpi_thermal_remove(struct acpi_device *device);
 94 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
 95 
 96 static const struct acpi_device_id  thermal_device_ids[] = {
 97         {ACPI_THERMAL_HID, 0},
 98         {"", 0},
 99 };
100 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
101 
102 #ifdef CONFIG_PM_SLEEP
103 static int acpi_thermal_suspend(struct device *dev);
104 static int acpi_thermal_resume(struct device *dev);
105 #else
106 #define acpi_thermal_suspend NULL
107 #define acpi_thermal_resume NULL
108 #endif
109 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
110 
111 static struct acpi_driver acpi_thermal_driver = {
112         .name = "thermal",
113         .class = ACPI_THERMAL_CLASS,
114         .ids = thermal_device_ids,
115         .ops = {
116                 .add = acpi_thermal_add,
117                 .remove = acpi_thermal_remove,
118                 .notify = acpi_thermal_notify,
119                 },
120         .drv.pm = &acpi_thermal_pm,
121 };
122 
123 struct acpi_thermal_state {
124         u8 critical:1;
125         u8 hot:1;
126         u8 passive:1;
127         u8 active:1;
128         u8 reserved:4;
129         int active_index;
130 };
131 
132 struct acpi_thermal_state_flags {
133         u8 valid:1;
134         u8 enabled:1;
135         u8 reserved:6;
136 };
137 
138 struct acpi_thermal_critical {
139         struct acpi_thermal_state_flags flags;
140         unsigned long temperature;
141 };
142 
143 struct acpi_thermal_hot {
144         struct acpi_thermal_state_flags flags;
145         unsigned long temperature;
146 };
147 
148 struct acpi_thermal_passive {
149         struct acpi_thermal_state_flags flags;
150         unsigned long temperature;
151         unsigned long tc1;
152         unsigned long tc2;
153         unsigned long tsp;
154         struct acpi_handle_list devices;
155 };
156 
157 struct acpi_thermal_active {
158         struct acpi_thermal_state_flags flags;
159         unsigned long temperature;
160         struct acpi_handle_list devices;
161 };
162 
163 struct acpi_thermal_trips {
164         struct acpi_thermal_critical critical;
165         struct acpi_thermal_hot hot;
166         struct acpi_thermal_passive passive;
167         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
168 };
169 
170 struct acpi_thermal_flags {
171         u8 cooling_mode:1;      /* _SCP */
172         u8 devices:1;           /* _TZD */
173         u8 reserved:6;
174 };
175 
176 struct acpi_thermal {
177         struct acpi_device * device;
178         acpi_bus_id name;
179         unsigned long temperature;
180         unsigned long last_temperature;
181         unsigned long polling_frequency;
182         volatile u8 zombie;
183         struct acpi_thermal_flags flags;
184         struct acpi_thermal_state state;
185         struct acpi_thermal_trips trips;
186         struct acpi_handle_list devices;
187         struct thermal_zone_device *thermal_zone;
188         int tz_enabled;
189         int kelvin_offset;
190         struct work_struct thermal_check_work;
191 };
192 
193 /* --------------------------------------------------------------------------
194                              Thermal Zone Management
195    -------------------------------------------------------------------------- */
196 
197 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
198 {
199         acpi_status status = AE_OK;
200         unsigned long long tmp;
201 
202         if (!tz)
203                 return -EINVAL;
204 
205         tz->last_temperature = tz->temperature;
206 
207         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
208         if (ACPI_FAILURE(status))
209                 return -ENODEV;
210 
211         tz->temperature = tmp;
212         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
213                           tz->temperature));
214 
215         return 0;
216 }
217 
218 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
219 {
220         acpi_status status = AE_OK;
221         unsigned long long tmp;
222 
223         if (!tz)
224                 return -EINVAL;
225 
226         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
227         if (ACPI_FAILURE(status))
228                 return -ENODEV;
229 
230         tz->polling_frequency = tmp;
231         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
232                           tz->polling_frequency));
233 
234         return 0;
235 }
236 
237 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
238 {
239         if (!tz)
240                 return -EINVAL;
241 
242         if (!acpi_has_method(tz->device->handle, "_SCP")) {
243                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
244                 return -ENODEV;
245         } else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
246                                                            "_SCP", mode))) {
247                 return -ENODEV;
248         }
249 
250         return 0;
251 }
252 
253 #define ACPI_TRIPS_CRITICAL     0x01
254 #define ACPI_TRIPS_HOT          0x02
255 #define ACPI_TRIPS_PASSIVE      0x04
256 #define ACPI_TRIPS_ACTIVE       0x08
257 #define ACPI_TRIPS_DEVICES      0x10
258 
259 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
260 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
261 
262 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
263                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
264                               ACPI_TRIPS_DEVICES)
265 
266 /*
267  * This exception is thrown out in two cases:
268  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
269  *   when re-evaluating the AML code.
270  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
271  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
272  */
273 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
274 do {    \
275         if (flags != ACPI_TRIPS_INIT)   \
276                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
277                 "ACPI thermal trip point %s changed\n"  \
278                 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
279 } while (0)
280 
281 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
282 {
283         acpi_status status = AE_OK;
284         unsigned long long tmp;
285         struct acpi_handle_list devices;
286         int valid = 0;
287         int i;
288 
289         /* Critical Shutdown */
290         if (flag & ACPI_TRIPS_CRITICAL) {
291                 status = acpi_evaluate_integer(tz->device->handle,
292                                 "_CRT", NULL, &tmp);
293                 tz->trips.critical.temperature = tmp;
294                 /*
295                  * Treat freezing temperatures as invalid as well; some
296                  * BIOSes return really low values and cause reboots at startup.
297                  * Below zero (Celsius) values clearly aren't right for sure..
298                  * ... so lets discard those as invalid.
299                  */
300                 if (ACPI_FAILURE(status)) {
301                         tz->trips.critical.flags.valid = 0;
302                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
303                                           "No critical threshold\n"));
304                 } else if (tmp <= 2732) {
305                         pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
306                                 tmp);
307                         tz->trips.critical.flags.valid = 0;
308                 } else {
309                         tz->trips.critical.flags.valid = 1;
310                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
311                                           "Found critical threshold [%lu]\n",
312                                           tz->trips.critical.temperature));
313                 }
314                 if (tz->trips.critical.flags.valid == 1) {
315                         if (crt == -1) {
316                                 tz->trips.critical.flags.valid = 0;
317                         } else if (crt > 0) {
318                                 unsigned long crt_k = CELSIUS_TO_DECI_KELVIN(crt);
319                                 /*
320                                  * Allow override critical threshold
321                                  */
322                                 if (crt_k > tz->trips.critical.temperature)
323                                         pr_warn(PREFIX "Critical threshold %d C\n",
324                                                 crt);
325                                 tz->trips.critical.temperature = crt_k;
326                         }
327                 }
328         }
329 
330         /* Critical Sleep (optional) */
331         if (flag & ACPI_TRIPS_HOT) {
332                 status = acpi_evaluate_integer(tz->device->handle,
333                                 "_HOT", NULL, &tmp);
334                 if (ACPI_FAILURE(status)) {
335                         tz->trips.hot.flags.valid = 0;
336                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
337                                         "No hot threshold\n"));
338                 } else {
339                         tz->trips.hot.temperature = tmp;
340                         tz->trips.hot.flags.valid = 1;
341                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
342                                         "Found hot threshold [%lu]\n",
343                                         tz->trips.hot.temperature));
344                 }
345         }
346 
347         /* Passive (optional) */
348         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
349                 (flag == ACPI_TRIPS_INIT)) {
350                 valid = tz->trips.passive.flags.valid;
351                 if (psv == -1) {
352                         status = AE_SUPPORT;
353                 } else if (psv > 0) {
354                         tmp = CELSIUS_TO_DECI_KELVIN(psv);
355                         status = AE_OK;
356                 } else {
357                         status = acpi_evaluate_integer(tz->device->handle,
358                                 "_PSV", NULL, &tmp);
359                 }
360 
361                 if (ACPI_FAILURE(status))
362                         tz->trips.passive.flags.valid = 0;
363                 else {
364                         tz->trips.passive.temperature = tmp;
365                         tz->trips.passive.flags.valid = 1;
366                         if (flag == ACPI_TRIPS_INIT) {
367                                 status = acpi_evaluate_integer(
368                                                 tz->device->handle, "_TC1",
369                                                 NULL, &tmp);
370                                 if (ACPI_FAILURE(status))
371                                         tz->trips.passive.flags.valid = 0;
372                                 else
373                                         tz->trips.passive.tc1 = tmp;
374                                 status = acpi_evaluate_integer(
375                                                 tz->device->handle, "_TC2",
376                                                 NULL, &tmp);
377                                 if (ACPI_FAILURE(status))
378                                         tz->trips.passive.flags.valid = 0;
379                                 else
380                                         tz->trips.passive.tc2 = tmp;
381                                 status = acpi_evaluate_integer(
382                                                 tz->device->handle, "_TSP",
383                                                 NULL, &tmp);
384                                 if (ACPI_FAILURE(status))
385                                         tz->trips.passive.flags.valid = 0;
386                                 else
387                                         tz->trips.passive.tsp = tmp;
388                         }
389                 }
390         }
391         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
392                 memset(&devices, 0, sizeof(struct acpi_handle_list));
393                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
394                                                         NULL, &devices);
395                 if (ACPI_FAILURE(status)) {
396                         pr_warn(PREFIX "Invalid passive threshold\n");
397                         tz->trips.passive.flags.valid = 0;
398                 }
399                 else
400                         tz->trips.passive.flags.valid = 1;
401 
402                 if (memcmp(&tz->trips.passive.devices, &devices,
403                                 sizeof(struct acpi_handle_list))) {
404                         memcpy(&tz->trips.passive.devices, &devices,
405                                 sizeof(struct acpi_handle_list));
406                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
407                 }
408         }
409         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
410                 if (valid != tz->trips.passive.flags.valid)
411                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
412         }
413 
414         /* Active (optional) */
415         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
416                 char name[5] = { '_', 'A', 'C', ('' + i), '\0' };
417                 valid = tz->trips.active[i].flags.valid;
418 
419                 if (act == -1)
420                         break; /* disable all active trip points */
421 
422                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
423                         tz->trips.active[i].flags.valid)) {
424                         status = acpi_evaluate_integer(tz->device->handle,
425                                                         name, NULL, &tmp);
426                         if (ACPI_FAILURE(status)) {
427                                 tz->trips.active[i].flags.valid = 0;
428                                 if (i == 0)
429                                         break;
430                                 if (act <= 0)
431                                         break;
432                                 if (i == 1)
433                                         tz->trips.active[0].temperature =
434                                                 CELSIUS_TO_DECI_KELVIN(act);
435                                 else
436                                         /*
437                                          * Don't allow override higher than
438                                          * the next higher trip point
439                                          */
440                                         tz->trips.active[i - 1].temperature =
441                                                 (tz->trips.active[i - 2].temperature <
442                                                 CELSIUS_TO_DECI_KELVIN(act) ?
443                                                 tz->trips.active[i - 2].temperature :
444                                                 CELSIUS_TO_DECI_KELVIN(act));
445                                 break;
446                         } else {
447                                 tz->trips.active[i].temperature = tmp;
448                                 tz->trips.active[i].flags.valid = 1;
449                         }
450                 }
451 
452                 name[2] = 'L';
453                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
454                         memset(&devices, 0, sizeof(struct acpi_handle_list));
455                         status = acpi_evaluate_reference(tz->device->handle,
456                                                 name, NULL, &devices);
457                         if (ACPI_FAILURE(status)) {
458                                 pr_warn(PREFIX "Invalid active%d threshold\n",
459                                         i);
460                                 tz->trips.active[i].flags.valid = 0;
461                         }
462                         else
463                                 tz->trips.active[i].flags.valid = 1;
464 
465                         if (memcmp(&tz->trips.active[i].devices, &devices,
466                                         sizeof(struct acpi_handle_list))) {
467                                 memcpy(&tz->trips.active[i].devices, &devices,
468                                         sizeof(struct acpi_handle_list));
469                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
470                         }
471                 }
472                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
473                         if (valid != tz->trips.active[i].flags.valid)
474                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
475 
476                 if (!tz->trips.active[i].flags.valid)
477                         break;
478         }
479 
480         if ((flag & ACPI_TRIPS_DEVICES)
481             && acpi_has_method(tz->device->handle, "_TZD")) {
482                 memset(&devices, 0, sizeof(devices));
483                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
484                                                 NULL, &devices);
485                 if (ACPI_SUCCESS(status)
486                     && memcmp(&tz->devices, &devices, sizeof(devices))) {
487                         tz->devices = devices;
488                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
489                 }
490         }
491 
492         return 0;
493 }
494 
495 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
496 {
497         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
498 
499         if (ret)
500                 return ret;
501 
502         valid = tz->trips.critical.flags.valid |
503                 tz->trips.hot.flags.valid |
504                 tz->trips.passive.flags.valid;
505 
506         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
507                 valid |= tz->trips.active[i].flags.valid;
508 
509         if (!valid) {
510                 pr_warn(FW_BUG "No valid trip found\n");
511                 return -ENODEV;
512         }
513         return 0;
514 }
515 
516 static void acpi_thermal_check(void *data)
517 {
518         struct acpi_thermal *tz = data;
519 
520         if (!tz->tz_enabled)
521                 return;
522 
523         thermal_zone_device_update(tz->thermal_zone);
524 }
525 
526 /* sys I/F for generic thermal sysfs support */
527 
528 static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
529 {
530         struct acpi_thermal *tz = thermal->devdata;
531         int result;
532 
533         if (!tz)
534                 return -EINVAL;
535 
536         result = acpi_thermal_get_temperature(tz);
537         if (result)
538                 return result;
539 
540         *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(tz->temperature,
541                                                         tz->kelvin_offset);
542         return 0;
543 }
544 
545 static int thermal_get_mode(struct thermal_zone_device *thermal,
546                                 enum thermal_device_mode *mode)
547 {
548         struct acpi_thermal *tz = thermal->devdata;
549 
550         if (!tz)
551                 return -EINVAL;
552 
553         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
554                 THERMAL_DEVICE_DISABLED;
555 
556         return 0;
557 }
558 
559 static int thermal_set_mode(struct thermal_zone_device *thermal,
560                                 enum thermal_device_mode mode)
561 {
562         struct acpi_thermal *tz = thermal->devdata;
563         int enable;
564 
565         if (!tz)
566                 return -EINVAL;
567 
568         /*
569          * enable/disable thermal management from ACPI thermal driver
570          */
571         if (mode == THERMAL_DEVICE_ENABLED)
572                 enable = 1;
573         else if (mode == THERMAL_DEVICE_DISABLED) {
574                 enable = 0;
575                 pr_warn("thermal zone will be disabled\n");
576         } else
577                 return -EINVAL;
578 
579         if (enable != tz->tz_enabled) {
580                 tz->tz_enabled = enable;
581                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
582                         "%s kernel ACPI thermal control\n",
583                         tz->tz_enabled ? "Enable" : "Disable"));
584                 acpi_thermal_check(tz);
585         }
586         return 0;
587 }
588 
589 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
590                                  int trip, enum thermal_trip_type *type)
591 {
592         struct acpi_thermal *tz = thermal->devdata;
593         int i;
594 
595         if (!tz || trip < 0)
596                 return -EINVAL;
597 
598         if (tz->trips.critical.flags.valid) {
599                 if (!trip) {
600                         *type = THERMAL_TRIP_CRITICAL;
601                         return 0;
602                 }
603                 trip--;
604         }
605 
606         if (tz->trips.hot.flags.valid) {
607                 if (!trip) {
608                         *type = THERMAL_TRIP_HOT;
609                         return 0;
610                 }
611                 trip--;
612         }
613 
614         if (tz->trips.passive.flags.valid) {
615                 if (!trip) {
616                         *type = THERMAL_TRIP_PASSIVE;
617                         return 0;
618                 }
619                 trip--;
620         }
621 
622         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
623                 tz->trips.active[i].flags.valid; i++) {
624                 if (!trip) {
625                         *type = THERMAL_TRIP_ACTIVE;
626                         return 0;
627                 }
628                 trip--;
629         }
630 
631         return -EINVAL;
632 }
633 
634 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
635                                  int trip, int *temp)
636 {
637         struct acpi_thermal *tz = thermal->devdata;
638         int i;
639 
640         if (!tz || trip < 0)
641                 return -EINVAL;
642 
643         if (tz->trips.critical.flags.valid) {
644                 if (!trip) {
645                         *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
646                                 tz->trips.critical.temperature,
647                                 tz->kelvin_offset);
648                         return 0;
649                 }
650                 trip--;
651         }
652 
653         if (tz->trips.hot.flags.valid) {
654                 if (!trip) {
655                         *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
656                                 tz->trips.hot.temperature,
657                                 tz->kelvin_offset);
658                         return 0;
659                 }
660                 trip--;
661         }
662 
663         if (tz->trips.passive.flags.valid) {
664                 if (!trip) {
665                         *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
666                                 tz->trips.passive.temperature,
667                                 tz->kelvin_offset);
668                         return 0;
669                 }
670                 trip--;
671         }
672 
673         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
674                 tz->trips.active[i].flags.valid; i++) {
675                 if (!trip) {
676                         *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
677                                 tz->trips.active[i].temperature,
678                                 tz->kelvin_offset);
679                         return 0;
680                 }
681                 trip--;
682         }
683 
684         return -EINVAL;
685 }
686 
687 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
688                                 int *temperature)
689 {
690         struct acpi_thermal *tz = thermal->devdata;
691 
692         if (tz->trips.critical.flags.valid) {
693                 *temperature = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
694                                 tz->trips.critical.temperature,
695                                 tz->kelvin_offset);
696                 return 0;
697         } else
698                 return -EINVAL;
699 }
700 
701 static int thermal_get_trend(struct thermal_zone_device *thermal,
702                                 int trip, enum thermal_trend *trend)
703 {
704         struct acpi_thermal *tz = thermal->devdata;
705         enum thermal_trip_type type;
706         int i;
707 
708         if (thermal_get_trip_type(thermal, trip, &type))
709                 return -EINVAL;
710 
711         if (type == THERMAL_TRIP_ACTIVE) {
712                 int trip_temp;
713                 int temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
714                                         tz->temperature, tz->kelvin_offset);
715                 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
716                         return -EINVAL;
717 
718                 if (temp > trip_temp) {
719                         *trend = THERMAL_TREND_RAISING;
720                         return 0;
721                 } else {
722                         /* Fall back on default trend */
723                         return -EINVAL;
724                 }
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_netlink_event(tz->device->pnp.device_class,
759                                         dev_name(&tz->device->dev), type, 1);
760 
761         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
762                 return 1;
763 
764         return 0;
765 }
766 
767 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
768                                         struct thermal_cooling_device *cdev,
769                                         bool bind)
770 {
771         struct acpi_device *device = cdev->devdata;
772         struct acpi_thermal *tz = thermal->devdata;
773         struct acpi_device *dev;
774         acpi_status status;
775         acpi_handle handle;
776         int i;
777         int j;
778         int trip = -1;
779         int result = 0;
780 
781         if (tz->trips.critical.flags.valid)
782                 trip++;
783 
784         if (tz->trips.hot.flags.valid)
785                 trip++;
786 
787         if (tz->trips.passive.flags.valid) {
788                 trip++;
789                 for (i = 0; i < tz->trips.passive.devices.count;
790                     i++) {
791                         handle = tz->trips.passive.devices.handles[i];
792                         status = acpi_bus_get_device(handle, &dev);
793                         if (ACPI_FAILURE(status) || dev != device)
794                                 continue;
795                         if (bind)
796                                 result =
797                                         thermal_zone_bind_cooling_device
798                                         (thermal, trip, cdev,
799                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
800                                          THERMAL_WEIGHT_DEFAULT);
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                                          THERMAL_WEIGHT_DEFAULT);
826                         else
827                                 result = thermal_zone_unbind_cooling_device
828                                         (thermal, trip, cdev);
829                         if (result)
830                                 goto failed;
831                 }
832         }
833 
834         for (i = 0; i < tz->devices.count; i++) {
835                 handle = tz->devices.handles[i];
836                 status = acpi_bus_get_device(handle, &dev);
837                 if (ACPI_SUCCESS(status) && (dev == device)) {
838                         if (bind)
839                                 result = thermal_zone_bind_cooling_device
840                                                 (thermal, THERMAL_TRIPS_NONE,
841                                                  cdev, THERMAL_NO_LIMIT,
842                                                  THERMAL_NO_LIMIT,
843                                                  THERMAL_WEIGHT_DEFAULT);
844                         else
845                                 result = thermal_zone_unbind_cooling_device
846                                                 (thermal, THERMAL_TRIPS_NONE,
847                                                  cdev);
848                         if (result)
849                                 goto failed;
850                 }
851         }
852 
853 failed:
854         return result;
855 }
856 
857 static int
858 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
859                                         struct thermal_cooling_device *cdev)
860 {
861         return acpi_thermal_cooling_device_cb(thermal, cdev, true);
862 }
863 
864 static int
865 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
866                                         struct thermal_cooling_device *cdev)
867 {
868         return acpi_thermal_cooling_device_cb(thermal, cdev, false);
869 }
870 
871 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
872         .bind = acpi_thermal_bind_cooling_device,
873         .unbind = acpi_thermal_unbind_cooling_device,
874         .get_temp = thermal_get_temp,
875         .get_mode = thermal_get_mode,
876         .set_mode = thermal_set_mode,
877         .get_trip_type = thermal_get_trip_type,
878         .get_trip_temp = thermal_get_trip_temp,
879         .get_crit_temp = thermal_get_crit_temp,
880         .get_trend = thermal_get_trend,
881         .notify = thermal_notify,
882 };
883 
884 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
885 {
886         int trips = 0;
887         int result;
888         acpi_status status;
889         int i;
890 
891         if (tz->trips.critical.flags.valid)
892                 trips++;
893 
894         if (tz->trips.hot.flags.valid)
895                 trips++;
896 
897         if (tz->trips.passive.flags.valid)
898                 trips++;
899 
900         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
901                         tz->trips.active[i].flags.valid; i++, trips++);
902 
903         if (tz->trips.passive.flags.valid)
904                 tz->thermal_zone =
905                         thermal_zone_device_register("acpitz", trips, 0, tz,
906                                                 &acpi_thermal_zone_ops, NULL,
907                                                      tz->trips.passive.tsp*100,
908                                                      tz->polling_frequency*100);
909         else
910                 tz->thermal_zone =
911                         thermal_zone_device_register("acpitz", trips, 0, tz,
912                                                 &acpi_thermal_zone_ops, NULL,
913                                                 0, tz->polling_frequency*100);
914         if (IS_ERR(tz->thermal_zone))
915                 return -ENODEV;
916 
917         result = sysfs_create_link(&tz->device->dev.kobj,
918                                    &tz->thermal_zone->device.kobj, "thermal_zone");
919         if (result)
920                 return result;
921 
922         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
923                                    &tz->device->dev.kobj, "device");
924         if (result)
925                 return result;
926 
927         status =  acpi_bus_attach_private_data(tz->device->handle,
928                                                tz->thermal_zone);
929         if (ACPI_FAILURE(status))
930                 return -ENODEV;
931 
932         tz->tz_enabled = 1;
933 
934         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
935                  tz->thermal_zone->id);
936         return 0;
937 }
938 
939 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
940 {
941         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
942         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
943         thermal_zone_device_unregister(tz->thermal_zone);
944         tz->thermal_zone = NULL;
945         acpi_bus_detach_private_data(tz->device->handle);
946 }
947 
948 
949 /* --------------------------------------------------------------------------
950                                  Driver Interface
951    -------------------------------------------------------------------------- */
952 
953 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
954 {
955         struct acpi_thermal *tz = acpi_driver_data(device);
956 
957 
958         if (!tz)
959                 return;
960 
961         switch (event) {
962         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
963                 acpi_thermal_check(tz);
964                 break;
965         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
966                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
967                 acpi_thermal_check(tz);
968                 acpi_bus_generate_netlink_event(device->pnp.device_class,
969                                                   dev_name(&device->dev), event, 0);
970                 break;
971         case ACPI_THERMAL_NOTIFY_DEVICES:
972                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
973                 acpi_thermal_check(tz);
974                 acpi_bus_generate_netlink_event(device->pnp.device_class,
975                                                   dev_name(&device->dev), event, 0);
976                 break;
977         default:
978                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
979                                   "Unsupported event [0x%x]\n", event));
980                 break;
981         }
982 }
983 
984 /*
985  * On some platforms, the AML code has dependency about
986  * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
987  * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
988  *    /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
989  * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
990  *    if _TMP has never been evaluated.
991  *
992  * As this dependency is totally transparent to OS, evaluate
993  * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
994  * _TMP, before they are actually used.
995  */
996 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
997 {
998         acpi_handle handle = tz->device->handle;
999         unsigned long long value;
1000         int i;
1001 
1002         acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1003         acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1004         acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1005         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1006                 char name[5] = { '_', 'A', 'C', ('' + i), '\0' };
1007                 acpi_status status;
1008 
1009                 status = acpi_evaluate_integer(handle, name, NULL, &value);
1010                 if (status == AE_NOT_FOUND)
1011                         break;
1012         }
1013         acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1014 }
1015 
1016 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1017 {
1018         int result = 0;
1019 
1020 
1021         if (!tz)
1022                 return -EINVAL;
1023 
1024         acpi_thermal_aml_dependency_fix(tz);
1025 
1026         /* Get trip points [_CRT, _PSV, etc.] (required) */
1027         result = acpi_thermal_get_trip_points(tz);
1028         if (result)
1029                 return result;
1030 
1031         /* Get temperature [_TMP] (required) */
1032         result = acpi_thermal_get_temperature(tz);
1033         if (result)
1034                 return result;
1035 
1036         /* Set the cooling mode [_SCP] to active cooling (default) */
1037         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1038         if (!result)
1039                 tz->flags.cooling_mode = 1;
1040 
1041         /* Get default polling frequency [_TZP] (optional) */
1042         if (tzp)
1043                 tz->polling_frequency = tzp;
1044         else
1045                 acpi_thermal_get_polling_frequency(tz);
1046 
1047         return 0;
1048 }
1049 
1050 /*
1051  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1052  * handles temperature values with a single decimal place. As a consequence,
1053  * some implementations use an offset of 273.1 and others use an offset of
1054  * 273.2. Try to find out which one is being used, to present the most
1055  * accurate and visually appealing number.
1056  *
1057  * The heuristic below should work for all ACPI thermal zones which have a
1058  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1059  */
1060 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1061 {
1062         if (tz->trips.critical.flags.valid &&
1063             (tz->trips.critical.temperature % 5) == 1)
1064                 tz->kelvin_offset = 2731;
1065         else
1066                 tz->kelvin_offset = 2732;
1067 }
1068 
1069 static void acpi_thermal_check_fn(struct work_struct *work)
1070 {
1071         struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1072                                                thermal_check_work);
1073         acpi_thermal_check(tz);
1074 }
1075 
1076 static int acpi_thermal_add(struct acpi_device *device)
1077 {
1078         int result = 0;
1079         struct acpi_thermal *tz = NULL;
1080 
1081 
1082         if (!device)
1083                 return -EINVAL;
1084 
1085         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1086         if (!tz)
1087                 return -ENOMEM;
1088 
1089         tz->device = device;
1090         strcpy(tz->name, device->pnp.bus_id);
1091         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1092         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1093         device->driver_data = tz;
1094 
1095         result = acpi_thermal_get_info(tz);
1096         if (result)
1097                 goto free_memory;
1098 
1099         acpi_thermal_guess_offset(tz);
1100 
1101         result = acpi_thermal_register_thermal_zone(tz);
1102         if (result)
1103                 goto free_memory;
1104 
1105         INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1106 
1107         pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1108                 acpi_device_bid(device), DECI_KELVIN_TO_CELSIUS(tz->temperature));
1109         goto end;
1110 
1111 free_memory:
1112         kfree(tz);
1113 end:
1114         return result;
1115 }
1116 
1117 static int acpi_thermal_remove(struct acpi_device *device)
1118 {
1119         struct acpi_thermal *tz = NULL;
1120 
1121         if (!device || !acpi_driver_data(device))
1122                 return -EINVAL;
1123 
1124         flush_workqueue(acpi_thermal_pm_queue);
1125         tz = acpi_driver_data(device);
1126 
1127         acpi_thermal_unregister_thermal_zone(tz);
1128         kfree(tz);
1129         return 0;
1130 }
1131 
1132 #ifdef CONFIG_PM_SLEEP
1133 static int acpi_thermal_suspend(struct device *dev)
1134 {
1135         /* Make sure the previously queued thermal check work has been done */
1136         flush_workqueue(acpi_thermal_pm_queue);
1137         return 0;
1138 }
1139 
1140 static int acpi_thermal_resume(struct device *dev)
1141 {
1142         struct acpi_thermal *tz;
1143         int i, j, power_state, result;
1144 
1145         if (!dev)
1146                 return -EINVAL;
1147 
1148         tz = acpi_driver_data(to_acpi_device(dev));
1149         if (!tz)
1150                 return -EINVAL;
1151 
1152         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1153                 if (!(&tz->trips.active[i]))
1154                         break;
1155                 if (!tz->trips.active[i].flags.valid)
1156                         break;
1157                 tz->trips.active[i].flags.enabled = 1;
1158                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1159                         result = acpi_bus_update_power(
1160                                         tz->trips.active[i].devices.handles[j],
1161                                         &power_state);
1162                         if (result || (power_state != ACPI_STATE_D0)) {
1163                                 tz->trips.active[i].flags.enabled = 0;
1164                                 break;
1165                         }
1166                 }
1167                 tz->state.active |= tz->trips.active[i].flags.enabled;
1168         }
1169 
1170         queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1171 
1172         return AE_OK;
1173 }
1174 #endif
1175 
1176 static int thermal_act(const struct dmi_system_id *d) {
1177 
1178         if (act == 0) {
1179                 pr_notice(PREFIX "%s detected: "
1180                           "disabling all active thermal trip points\n", d->ident);
1181                 act = -1;
1182         }
1183         return 0;
1184 }
1185 static int thermal_nocrt(const struct dmi_system_id *d) {
1186 
1187         pr_notice(PREFIX "%s detected: "
1188                   "disabling all critical thermal trip point actions.\n", d->ident);
1189         nocrt = 1;
1190         return 0;
1191 }
1192 static int thermal_tzp(const struct dmi_system_id *d) {
1193 
1194         if (tzp == 0) {
1195                 pr_notice(PREFIX "%s detected: "
1196                           "enabling thermal zone polling\n", d->ident);
1197                 tzp = 300;      /* 300 dS = 30 Seconds */
1198         }
1199         return 0;
1200 }
1201 static int thermal_psv(const struct dmi_system_id *d) {
1202 
1203         if (psv == 0) {
1204                 pr_notice(PREFIX "%s detected: "
1205                           "disabling all passive thermal trip points\n", d->ident);
1206                 psv = -1;
1207         }
1208         return 0;
1209 }
1210 
1211 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1212         /*
1213          * Award BIOS on this AOpen makes thermal control almost worthless.
1214          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1215          */
1216         {
1217          .callback = thermal_act,
1218          .ident = "AOpen i915GMm-HFS",
1219          .matches = {
1220                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1221                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1222                 },
1223         },
1224         {
1225          .callback = thermal_psv,
1226          .ident = "AOpen i915GMm-HFS",
1227          .matches = {
1228                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1229                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1230                 },
1231         },
1232         {
1233          .callback = thermal_tzp,
1234          .ident = "AOpen i915GMm-HFS",
1235          .matches = {
1236                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1237                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1238                 },
1239         },
1240         {
1241          .callback = thermal_nocrt,
1242          .ident = "Gigabyte GA-7ZX",
1243          .matches = {
1244                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1245                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1246                 },
1247         },
1248         {}
1249 };
1250 
1251 static int __init acpi_thermal_init(void)
1252 {
1253         int result = 0;
1254 
1255         dmi_check_system(thermal_dmi_table);
1256 
1257         if (off) {
1258                 pr_notice(PREFIX "thermal control disabled\n");
1259                 return -ENODEV;
1260         }
1261 
1262         acpi_thermal_pm_queue = create_workqueue("acpi_thermal_pm");
1263         if (!acpi_thermal_pm_queue)
1264                 return -ENODEV;
1265 
1266         result = acpi_bus_register_driver(&acpi_thermal_driver);
1267         if (result < 0) {
1268                 destroy_workqueue(acpi_thermal_pm_queue);
1269                 return -ENODEV;
1270         }
1271 
1272         return 0;
1273 }
1274 
1275 static void __exit acpi_thermal_exit(void)
1276 {
1277         acpi_bus_unregister_driver(&acpi_thermal_driver);
1278         destroy_workqueue(acpi_thermal_pm_queue);
1279 
1280         return;
1281 }
1282 
1283 module_init(acpi_thermal_init);
1284 module_exit(acpi_thermal_exit);
1285 

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