Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

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  *  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 <linux/thermal.h>
 45 #include <linux/acpi.h>
 46 #include <linux/workqueue.h>
 47 #include <asm/uaccess.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_NOTIFY_TEMPERATURE 0x80
 54 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
 55 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
 56 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
 57 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
 58 #define ACPI_THERMAL_MODE_ACTIVE        0x00
 59 
 60 #define ACPI_THERMAL_MAX_ACTIVE 10
 61 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
 62 
 63 #define _COMPONENT              ACPI_THERMAL_COMPONENT
 64 ACPI_MODULE_NAME("thermal");
 65 
 66 MODULE_AUTHOR("Paul Diefenbaugh");
 67 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
 68 MODULE_LICENSE("GPL");
 69 
 70 static int act;
 71 module_param(act, int, 0644);
 72 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
 73 
 74 static int crt;
 75 module_param(crt, int, 0644);
 76 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
 77 
 78 static int tzp;
 79 module_param(tzp, int, 0444);
 80 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
 81 
 82 static int nocrt;
 83 module_param(nocrt, int, 0);
 84 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
 85 
 86 static int off;
 87 module_param(off, int, 0);
 88 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
 89 
 90 static int psv;
 91 module_param(psv, int, 0644);
 92 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
 93 
 94 static struct workqueue_struct *acpi_thermal_pm_queue;
 95 
 96 static int acpi_thermal_add(struct acpi_device *device);
 97 static int acpi_thermal_remove(struct acpi_device *device);
 98 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
 99 
100 static const struct acpi_device_id  thermal_device_ids[] = {
101         {ACPI_THERMAL_HID, 0},
102         {"", 0},
103 };
104 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
105 
106 #ifdef CONFIG_PM_SLEEP
107 static int acpi_thermal_suspend(struct device *dev);
108 static int acpi_thermal_resume(struct device *dev);
109 #else
110 #define acpi_thermal_suspend NULL
111 #define acpi_thermal_resume NULL
112 #endif
113 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
114 
115 static struct acpi_driver acpi_thermal_driver = {
116         .name = "thermal",
117         .class = ACPI_THERMAL_CLASS,
118         .ids = thermal_device_ids,
119         .ops = {
120                 .add = acpi_thermal_add,
121                 .remove = acpi_thermal_remove,
122                 .notify = acpi_thermal_notify,
123                 },
124         .drv.pm = &acpi_thermal_pm,
125 };
126 
127 struct acpi_thermal_state {
128         u8 critical:1;
129         u8 hot:1;
130         u8 passive:1;
131         u8 active:1;
132         u8 reserved:4;
133         int active_index;
134 };
135 
136 struct acpi_thermal_state_flags {
137         u8 valid:1;
138         u8 enabled:1;
139         u8 reserved:6;
140 };
141 
142 struct acpi_thermal_critical {
143         struct acpi_thermal_state_flags flags;
144         unsigned long temperature;
145 };
146 
147 struct acpi_thermal_hot {
148         struct acpi_thermal_state_flags flags;
149         unsigned long temperature;
150 };
151 
152 struct acpi_thermal_passive {
153         struct acpi_thermal_state_flags flags;
154         unsigned long temperature;
155         unsigned long tc1;
156         unsigned long tc2;
157         unsigned long tsp;
158         struct acpi_handle_list devices;
159 };
160 
161 struct acpi_thermal_active {
162         struct acpi_thermal_state_flags flags;
163         unsigned long temperature;
164         struct acpi_handle_list devices;
165 };
166 
167 struct acpi_thermal_trips {
168         struct acpi_thermal_critical critical;
169         struct acpi_thermal_hot hot;
170         struct acpi_thermal_passive passive;
171         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
172 };
173 
174 struct acpi_thermal_flags {
175         u8 cooling_mode:1;      /* _SCP */
176         u8 devices:1;           /* _TZD */
177         u8 reserved:6;
178 };
179 
180 struct acpi_thermal {
181         struct acpi_device * device;
182         acpi_bus_id name;
183         unsigned long temperature;
184         unsigned long last_temperature;
185         unsigned long polling_frequency;
186         volatile u8 zombie;
187         struct acpi_thermal_flags flags;
188         struct acpi_thermal_state state;
189         struct acpi_thermal_trips trips;
190         struct acpi_handle_list devices;
191         struct thermal_zone_device *thermal_zone;
192         int tz_enabled;
193         int kelvin_offset;
194         struct work_struct thermal_check_work;
195 };
196 
197 /* --------------------------------------------------------------------------
198                              Thermal Zone Management
199    -------------------------------------------------------------------------- */
200 
201 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
202 {
203         acpi_status status = AE_OK;
204         unsigned long long tmp;
205 
206         if (!tz)
207                 return -EINVAL;
208 
209         tz->last_temperature = tz->temperature;
210 
211         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
212         if (ACPI_FAILURE(status))
213                 return -ENODEV;
214 
215         tz->temperature = tmp;
216         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
217                           tz->temperature));
218 
219         return 0;
220 }
221 
222 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
223 {
224         acpi_status status = AE_OK;
225         unsigned long long tmp;
226 
227         if (!tz)
228                 return -EINVAL;
229 
230         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
231         if (ACPI_FAILURE(status))
232                 return -ENODEV;
233 
234         tz->polling_frequency = tmp;
235         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
236                           tz->polling_frequency));
237 
238         return 0;
239 }
240 
241 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
242 {
243         if (!tz)
244                 return -EINVAL;
245 
246         if (!acpi_has_method(tz->device->handle, "_SCP")) {
247                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
248                 return -ENODEV;
249         } else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
250                                                            "_SCP", mode))) {
251                 return -ENODEV;
252         }
253 
254         return 0;
255 }
256 
257 #define ACPI_TRIPS_CRITICAL     0x01
258 #define ACPI_TRIPS_HOT          0x02
259 #define ACPI_TRIPS_PASSIVE      0x04
260 #define ACPI_TRIPS_ACTIVE       0x08
261 #define ACPI_TRIPS_DEVICES      0x10
262 
263 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
264 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
265 
266 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
267                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
268                               ACPI_TRIPS_DEVICES)
269 
270 /*
271  * This exception is thrown out in two cases:
272  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
273  *   when re-evaluating the AML code.
274  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
275  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
276  */
277 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
278 do {    \
279         if (flags != ACPI_TRIPS_INIT)   \
280                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
281                 "ACPI thermal trip point %s changed\n"  \
282                 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
283 } while (0)
284 
285 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
286 {
287         acpi_status status = AE_OK;
288         unsigned long long tmp;
289         struct acpi_handle_list devices;
290         int valid = 0;
291         int i;
292 
293         /* Critical Shutdown */
294         if (flag & ACPI_TRIPS_CRITICAL) {
295                 status = acpi_evaluate_integer(tz->device->handle,
296                                 "_CRT", NULL, &tmp);
297                 tz->trips.critical.temperature = tmp;
298                 /*
299                  * Treat freezing temperatures as invalid as well; some
300                  * BIOSes return really low values and cause reboots at startup.
301                  * Below zero (Celsius) values clearly aren't right for sure..
302                  * ... so lets discard those as invalid.
303                  */
304                 if (ACPI_FAILURE(status)) {
305                         tz->trips.critical.flags.valid = 0;
306                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
307                                           "No critical threshold\n"));
308                 } else if (tmp <= 2732) {
309                         pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
310                                 tmp);
311                         tz->trips.critical.flags.valid = 0;
312                 } else {
313                         tz->trips.critical.flags.valid = 1;
314                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
315                                           "Found critical threshold [%lu]\n",
316                                           tz->trips.critical.temperature));
317                 }
318                 if (tz->trips.critical.flags.valid == 1) {
319                         if (crt == -1) {
320                                 tz->trips.critical.flags.valid = 0;
321                         } else if (crt > 0) {
322                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
323                                 /*
324                                  * Allow override critical threshold
325                                  */
326                                 if (crt_k > tz->trips.critical.temperature)
327                                         pr_warn(PREFIX "Critical threshold %d C\n",
328                                                 crt);
329                                 tz->trips.critical.temperature = crt_k;
330                         }
331                 }
332         }
333 
334         /* Critical Sleep (optional) */
335         if (flag & ACPI_TRIPS_HOT) {
336                 status = acpi_evaluate_integer(tz->device->handle,
337                                 "_HOT", NULL, &tmp);
338                 if (ACPI_FAILURE(status)) {
339                         tz->trips.hot.flags.valid = 0;
340                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
341                                         "No hot threshold\n"));
342                 } else {
343                         tz->trips.hot.temperature = tmp;
344                         tz->trips.hot.flags.valid = 1;
345                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
346                                         "Found hot threshold [%lu]\n",
347                                         tz->trips.hot.temperature));
348                 }
349         }
350 
351         /* Passive (optional) */
352         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
353                 (flag == ACPI_TRIPS_INIT)) {
354                 valid = tz->trips.passive.flags.valid;
355                 if (psv == -1) {
356                         status = AE_SUPPORT;
357                 } else if (psv > 0) {
358                         tmp = CELSIUS_TO_KELVIN(psv);
359                         status = AE_OK;
360                 } else {
361                         status = acpi_evaluate_integer(tz->device->handle,
362                                 "_PSV", NULL, &tmp);
363                 }
364 
365                 if (ACPI_FAILURE(status))
366                         tz->trips.passive.flags.valid = 0;
367                 else {
368                         tz->trips.passive.temperature = tmp;
369                         tz->trips.passive.flags.valid = 1;
370                         if (flag == ACPI_TRIPS_INIT) {
371                                 status = acpi_evaluate_integer(
372                                                 tz->device->handle, "_TC1",
373                                                 NULL, &tmp);
374                                 if (ACPI_FAILURE(status))
375                                         tz->trips.passive.flags.valid = 0;
376                                 else
377                                         tz->trips.passive.tc1 = tmp;
378                                 status = acpi_evaluate_integer(
379                                                 tz->device->handle, "_TC2",
380                                                 NULL, &tmp);
381                                 if (ACPI_FAILURE(status))
382                                         tz->trips.passive.flags.valid = 0;
383                                 else
384                                         tz->trips.passive.tc2 = tmp;
385                                 status = acpi_evaluate_integer(
386                                                 tz->device->handle, "_TSP",
387                                                 NULL, &tmp);
388                                 if (ACPI_FAILURE(status))
389                                         tz->trips.passive.flags.valid = 0;
390                                 else
391                                         tz->trips.passive.tsp = tmp;
392                         }
393                 }
394         }
395         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
396                 memset(&devices, 0, sizeof(struct acpi_handle_list));
397                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
398                                                         NULL, &devices);
399                 if (ACPI_FAILURE(status)) {
400                         pr_warn(PREFIX "Invalid passive threshold\n");
401                         tz->trips.passive.flags.valid = 0;
402                 }
403                 else
404                         tz->trips.passive.flags.valid = 1;
405 
406                 if (memcmp(&tz->trips.passive.devices, &devices,
407                                 sizeof(struct acpi_handle_list))) {
408                         memcpy(&tz->trips.passive.devices, &devices,
409                                 sizeof(struct acpi_handle_list));
410                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
411                 }
412         }
413         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
414                 if (valid != tz->trips.passive.flags.valid)
415                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
416         }
417 
418         /* Active (optional) */
419         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
420                 char name[5] = { '_', 'A', 'C', ('' + i), '\0' };
421                 valid = tz->trips.active[i].flags.valid;
422 
423                 if (act == -1)
424                         break; /* disable all active trip points */
425 
426                 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
427                         tz->trips.active[i].flags.valid)) {
428                         status = acpi_evaluate_integer(tz->device->handle,
429                                                         name, NULL, &tmp);
430                         if (ACPI_FAILURE(status)) {
431                                 tz->trips.active[i].flags.valid = 0;
432                                 if (i == 0)
433                                         break;
434                                 if (act <= 0)
435                                         break;
436                                 if (i == 1)
437                                         tz->trips.active[0].temperature =
438                                                 CELSIUS_TO_KELVIN(act);
439                                 else
440                                         /*
441                                          * Don't allow override higher than
442                                          * the next higher trip point
443                                          */
444                                         tz->trips.active[i - 1].temperature =
445                                                 (tz->trips.active[i - 2].temperature <
446                                                 CELSIUS_TO_KELVIN(act) ?
447                                                 tz->trips.active[i - 2].temperature :
448                                                 CELSIUS_TO_KELVIN(act));
449                                 break;
450                         } else {
451                                 tz->trips.active[i].temperature = tmp;
452                                 tz->trips.active[i].flags.valid = 1;
453                         }
454                 }
455 
456                 name[2] = 'L';
457                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
458                         memset(&devices, 0, sizeof(struct acpi_handle_list));
459                         status = acpi_evaluate_reference(tz->device->handle,
460                                                 name, NULL, &devices);
461                         if (ACPI_FAILURE(status)) {
462                                 pr_warn(PREFIX "Invalid active%d threshold\n",
463                                         i);
464                                 tz->trips.active[i].flags.valid = 0;
465                         }
466                         else
467                                 tz->trips.active[i].flags.valid = 1;
468 
469                         if (memcmp(&tz->trips.active[i].devices, &devices,
470                                         sizeof(struct acpi_handle_list))) {
471                                 memcpy(&tz->trips.active[i].devices, &devices,
472                                         sizeof(struct acpi_handle_list));
473                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
474                         }
475                 }
476                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
477                         if (valid != tz->trips.active[i].flags.valid)
478                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
479 
480                 if (!tz->trips.active[i].flags.valid)
481                         break;
482         }
483 
484         if ((flag & ACPI_TRIPS_DEVICES)
485             && acpi_has_method(tz->device->handle, "_TZD")) {
486                 memset(&devices, 0, sizeof(devices));
487                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
488                                                 NULL, &devices);
489                 if (ACPI_SUCCESS(status)
490                     && memcmp(&tz->devices, &devices, sizeof(devices))) {
491                         tz->devices = devices;
492                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
493                 }
494         }
495 
496         return 0;
497 }
498 
499 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
500 {
501         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
502 
503         if (ret)
504                 return ret;
505 
506         valid = tz->trips.critical.flags.valid |
507                 tz->trips.hot.flags.valid |
508                 tz->trips.passive.flags.valid;
509 
510         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
511                 valid |= tz->trips.active[i].flags.valid;
512 
513         if (!valid) {
514                 pr_warn(FW_BUG "No valid trip found\n");
515                 return -ENODEV;
516         }
517         return 0;
518 }
519 
520 static void acpi_thermal_check(void *data)
521 {
522         struct acpi_thermal *tz = data;
523 
524         if (!tz->tz_enabled)
525                 return;
526 
527         thermal_zone_device_update(tz->thermal_zone);
528 }
529 
530 /* sys I/F for generic thermal sysfs support */
531 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
532 
533 static int thermal_get_temp(struct thermal_zone_device *thermal,
534                             unsigned long *temp)
535 {
536         struct acpi_thermal *tz = thermal->devdata;
537         int result;
538 
539         if (!tz)
540                 return -EINVAL;
541 
542         result = acpi_thermal_get_temperature(tz);
543         if (result)
544                 return result;
545 
546         *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
547         return 0;
548 }
549 
550 static int thermal_get_mode(struct thermal_zone_device *thermal,
551                                 enum thermal_device_mode *mode)
552 {
553         struct acpi_thermal *tz = thermal->devdata;
554 
555         if (!tz)
556                 return -EINVAL;
557 
558         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
559                 THERMAL_DEVICE_DISABLED;
560 
561         return 0;
562 }
563 
564 static int thermal_set_mode(struct thermal_zone_device *thermal,
565                                 enum thermal_device_mode mode)
566 {
567         struct acpi_thermal *tz = thermal->devdata;
568         int enable;
569 
570         if (!tz)
571                 return -EINVAL;
572 
573         /*
574          * enable/disable thermal management from ACPI thermal driver
575          */
576         if (mode == THERMAL_DEVICE_ENABLED)
577                 enable = 1;
578         else if (mode == THERMAL_DEVICE_DISABLED) {
579                 enable = 0;
580                 pr_warn("thermal zone will be disabled\n");
581         } else
582                 return -EINVAL;
583 
584         if (enable != tz->tz_enabled) {
585                 tz->tz_enabled = enable;
586                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
587                         "%s kernel ACPI thermal control\n",
588                         tz->tz_enabled ? "Enable" : "Disable"));
589                 acpi_thermal_check(tz);
590         }
591         return 0;
592 }
593 
594 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
595                                  int trip, enum thermal_trip_type *type)
596 {
597         struct acpi_thermal *tz = thermal->devdata;
598         int i;
599 
600         if (!tz || trip < 0)
601                 return -EINVAL;
602 
603         if (tz->trips.critical.flags.valid) {
604                 if (!trip) {
605                         *type = THERMAL_TRIP_CRITICAL;
606                         return 0;
607                 }
608                 trip--;
609         }
610 
611         if (tz->trips.hot.flags.valid) {
612                 if (!trip) {
613                         *type = THERMAL_TRIP_HOT;
614                         return 0;
615                 }
616                 trip--;
617         }
618 
619         if (tz->trips.passive.flags.valid) {
620                 if (!trip) {
621                         *type = THERMAL_TRIP_PASSIVE;
622                         return 0;
623                 }
624                 trip--;
625         }
626 
627         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
628                 tz->trips.active[i].flags.valid; i++) {
629                 if (!trip) {
630                         *type = THERMAL_TRIP_ACTIVE;
631                         return 0;
632                 }
633                 trip--;
634         }
635 
636         return -EINVAL;
637 }
638 
639 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
640                                  int trip, unsigned long *temp)
641 {
642         struct acpi_thermal *tz = thermal->devdata;
643         int i;
644 
645         if (!tz || trip < 0)
646                 return -EINVAL;
647 
648         if (tz->trips.critical.flags.valid) {
649                 if (!trip) {
650                         *temp = KELVIN_TO_MILLICELSIUS(
651                                 tz->trips.critical.temperature,
652                                 tz->kelvin_offset);
653                         return 0;
654                 }
655                 trip--;
656         }
657 
658         if (tz->trips.hot.flags.valid) {
659                 if (!trip) {
660                         *temp = KELVIN_TO_MILLICELSIUS(
661                                 tz->trips.hot.temperature,
662                                 tz->kelvin_offset);
663                         return 0;
664                 }
665                 trip--;
666         }
667 
668         if (tz->trips.passive.flags.valid) {
669                 if (!trip) {
670                         *temp = KELVIN_TO_MILLICELSIUS(
671                                 tz->trips.passive.temperature,
672                                 tz->kelvin_offset);
673                         return 0;
674                 }
675                 trip--;
676         }
677 
678         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
679                 tz->trips.active[i].flags.valid; i++) {
680                 if (!trip) {
681                         *temp = KELVIN_TO_MILLICELSIUS(
682                                 tz->trips.active[i].temperature,
683                                 tz->kelvin_offset);
684                         return 0;
685                 }
686                 trip--;
687         }
688 
689         return -EINVAL;
690 }
691 
692 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
693                                 unsigned long *temperature) {
694         struct acpi_thermal *tz = thermal->devdata;
695 
696         if (tz->trips.critical.flags.valid) {
697                 *temperature = KELVIN_TO_MILLICELSIUS(
698                                 tz->trips.critical.temperature,
699                                 tz->kelvin_offset);
700                 return 0;
701         } else
702                 return -EINVAL;
703 }
704 
705 static int thermal_get_trend(struct thermal_zone_device *thermal,
706                                 int trip, enum thermal_trend *trend)
707 {
708         struct acpi_thermal *tz = thermal->devdata;
709         enum thermal_trip_type type;
710         int i;
711 
712         if (thermal_get_trip_type(thermal, trip, &type))
713                 return -EINVAL;
714 
715         if (type == THERMAL_TRIP_ACTIVE) {
716                 unsigned long trip_temp;
717                 unsigned long temp = KELVIN_TO_MILLICELSIUS(tz->temperature,
718                                                         tz->kelvin_offset);
719                 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
720                         return -EINVAL;
721 
722                 if (temp > trip_temp) {
723                         *trend = THERMAL_TREND_RAISING;
724                         return 0;
725                 } else {
726                         /* Fall back on default trend */
727                         return -EINVAL;
728                 }
729         }
730 
731         /*
732          * tz->temperature has already been updated by generic thermal layer,
733          * before this callback being invoked
734          */
735         i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
736                 + (tz->trips.passive.tc2
737                 * (tz->temperature - tz->trips.passive.temperature));
738 
739         if (i > 0)
740                 *trend = THERMAL_TREND_RAISING;
741         else if (i < 0)
742                 *trend = THERMAL_TREND_DROPPING;
743         else
744                 *trend = THERMAL_TREND_STABLE;
745         return 0;
746 }
747 
748 
749 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
750                            enum thermal_trip_type trip_type)
751 {
752         u8 type = 0;
753         struct acpi_thermal *tz = thermal->devdata;
754 
755         if (trip_type == THERMAL_TRIP_CRITICAL)
756                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
757         else if (trip_type == THERMAL_TRIP_HOT)
758                 type = ACPI_THERMAL_NOTIFY_HOT;
759         else
760                 return 0;
761 
762         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
763                                         dev_name(&tz->device->dev), type, 1);
764 
765         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
766                 return 1;
767 
768         return 0;
769 }
770 
771 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
772                                         struct thermal_cooling_device *cdev,
773                                         bool bind)
774 {
775         struct acpi_device *device = cdev->devdata;
776         struct acpi_thermal *tz = thermal->devdata;
777         struct acpi_device *dev;
778         acpi_status status;
779         acpi_handle handle;
780         int i;
781         int j;
782         int trip = -1;
783         int result = 0;
784 
785         if (tz->trips.critical.flags.valid)
786                 trip++;
787 
788         if (tz->trips.hot.flags.valid)
789                 trip++;
790 
791         if (tz->trips.passive.flags.valid) {
792                 trip++;
793                 for (i = 0; i < tz->trips.passive.devices.count;
794                     i++) {
795                         handle = tz->trips.passive.devices.handles[i];
796                         status = acpi_bus_get_device(handle, &dev);
797                         if (ACPI_FAILURE(status) || dev != device)
798                                 continue;
799                         if (bind)
800                                 result =
801                                         thermal_zone_bind_cooling_device
802                                         (thermal, trip, cdev,
803                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
804                         else
805                                 result =
806                                         thermal_zone_unbind_cooling_device
807                                         (thermal, trip, cdev);
808                         if (result)
809                                 goto failed;
810                 }
811         }
812 
813         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
814                 if (!tz->trips.active[i].flags.valid)
815                         break;
816                 trip++;
817                 for (j = 0;
818                     j < tz->trips.active[i].devices.count;
819                     j++) {
820                         handle = tz->trips.active[i].devices.handles[j];
821                         status = acpi_bus_get_device(handle, &dev);
822                         if (ACPI_FAILURE(status) || dev != device)
823                                 continue;
824                         if (bind)
825                                 result = thermal_zone_bind_cooling_device
826                                         (thermal, trip, cdev,
827                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
828                         else
829                                 result = thermal_zone_unbind_cooling_device
830                                         (thermal, trip, cdev);
831                         if (result)
832                                 goto failed;
833                 }
834         }
835 
836         for (i = 0; i < tz->devices.count; i++) {
837                 handle = tz->devices.handles[i];
838                 status = acpi_bus_get_device(handle, &dev);
839                 if (ACPI_SUCCESS(status) && (dev == device)) {
840                         if (bind)
841                                 result = thermal_zone_bind_cooling_device
842                                                 (thermal, THERMAL_TRIPS_NONE,
843                                                  cdev, THERMAL_NO_LIMIT,
844                                                  THERMAL_NO_LIMIT);
845                         else
846                                 result = thermal_zone_unbind_cooling_device
847                                                 (thermal, THERMAL_TRIPS_NONE,
848                                                  cdev);
849                         if (result)
850                                 goto failed;
851                 }
852         }
853 
854 failed:
855         return result;
856 }
857 
858 static int
859 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
860                                         struct thermal_cooling_device *cdev)
861 {
862         return acpi_thermal_cooling_device_cb(thermal, cdev, true);
863 }
864 
865 static int
866 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
867                                         struct thermal_cooling_device *cdev)
868 {
869         return acpi_thermal_cooling_device_cb(thermal, cdev, false);
870 }
871 
872 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
873         .bind = acpi_thermal_bind_cooling_device,
874         .unbind = acpi_thermal_unbind_cooling_device,
875         .get_temp = thermal_get_temp,
876         .get_mode = thermal_get_mode,
877         .set_mode = thermal_set_mode,
878         .get_trip_type = thermal_get_trip_type,
879         .get_trip_temp = thermal_get_trip_temp,
880         .get_crit_temp = thermal_get_crit_temp,
881         .get_trend = thermal_get_trend,
882         .notify = thermal_notify,
883 };
884 
885 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
886 {
887         int trips = 0;
888         int result;
889         acpi_status status;
890         int i;
891 
892         if (tz->trips.critical.flags.valid)
893                 trips++;
894 
895         if (tz->trips.hot.flags.valid)
896                 trips++;
897 
898         if (tz->trips.passive.flags.valid)
899                 trips++;
900 
901         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
902                         tz->trips.active[i].flags.valid; i++, trips++);
903 
904         if (tz->trips.passive.flags.valid)
905                 tz->thermal_zone =
906                         thermal_zone_device_register("acpitz", trips, 0, tz,
907                                                 &acpi_thermal_zone_ops, NULL,
908                                                      tz->trips.passive.tsp*100,
909                                                      tz->polling_frequency*100);
910         else
911                 tz->thermal_zone =
912                         thermal_zone_device_register("acpitz", trips, 0, tz,
913                                                 &acpi_thermal_zone_ops, NULL,
914                                                 0, tz->polling_frequency*100);
915         if (IS_ERR(tz->thermal_zone))
916                 return -ENODEV;
917 
918         result = sysfs_create_link(&tz->device->dev.kobj,
919                                    &tz->thermal_zone->device.kobj, "thermal_zone");
920         if (result)
921                 return result;
922 
923         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
924                                    &tz->device->dev.kobj, "device");
925         if (result)
926                 return result;
927 
928         status =  acpi_bus_attach_private_data(tz->device->handle,
929                                                tz->thermal_zone);
930         if (ACPI_FAILURE(status))
931                 return -ENODEV;
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_bus_detach_private_data(tz->device->handle);
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_netlink_event(device->pnp.device_class,
970                                                   dev_name(&device->dev), event, 0);
971                 break;
972         case ACPI_THERMAL_NOTIFY_DEVICES:
973                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
974                 acpi_thermal_check(tz);
975                 acpi_bus_generate_netlink_event(device->pnp.device_class,
976                                                   dev_name(&device->dev), event, 0);
977                 break;
978         default:
979                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
980                                   "Unsupported event [0x%x]\n", event));
981                 break;
982         }
983 }
984 
985 /*
986  * On some platforms, the AML code has dependency about
987  * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
988  * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
989  *    /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
990  * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
991  *    if _TMP has never been evaluated.
992  *
993  * As this dependency is totally transparent to OS, evaluate
994  * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
995  * _TMP, before they are actually used.
996  */
997 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
998 {
999         acpi_handle handle = tz->device->handle;
1000         unsigned long long value;
1001         int i;
1002 
1003         acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1004         acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1005         acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1006         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1007                 char name[5] = { '_', 'A', 'C', ('' + i), '\0' };
1008                 acpi_status status;
1009 
1010                 status = acpi_evaluate_integer(handle, name, NULL, &value);
1011                 if (status == AE_NOT_FOUND)
1012                         break;
1013         }
1014         acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1015 }
1016 
1017 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1018 {
1019         int result = 0;
1020 
1021 
1022         if (!tz)
1023                 return -EINVAL;
1024 
1025         acpi_thermal_aml_dependency_fix(tz);
1026 
1027         /* Get trip points [_CRT, _PSV, etc.] (required) */
1028         result = acpi_thermal_get_trip_points(tz);
1029         if (result)
1030                 return result;
1031 
1032         /* Get temperature [_TMP] (required) */
1033         result = acpi_thermal_get_temperature(tz);
1034         if (result)
1035                 return result;
1036 
1037         /* Set the cooling mode [_SCP] to active cooling (default) */
1038         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1039         if (!result)
1040                 tz->flags.cooling_mode = 1;
1041 
1042         /* Get default polling frequency [_TZP] (optional) */
1043         if (tzp)
1044                 tz->polling_frequency = tzp;
1045         else
1046                 acpi_thermal_get_polling_frequency(tz);
1047 
1048         return 0;
1049 }
1050 
1051 /*
1052  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1053  * handles temperature values with a single decimal place. As a consequence,
1054  * some implementations use an offset of 273.1 and others use an offset of
1055  * 273.2. Try to find out which one is being used, to present the most
1056  * accurate and visually appealing number.
1057  *
1058  * The heuristic below should work for all ACPI thermal zones which have a
1059  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1060  */
1061 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1062 {
1063         if (tz->trips.critical.flags.valid &&
1064             (tz->trips.critical.temperature % 5) == 1)
1065                 tz->kelvin_offset = 2731;
1066         else
1067                 tz->kelvin_offset = 2732;
1068 }
1069 
1070 static void acpi_thermal_check_fn(struct work_struct *work)
1071 {
1072         struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1073                                                thermal_check_work);
1074         acpi_thermal_check(tz);
1075 }
1076 
1077 static int acpi_thermal_add(struct acpi_device *device)
1078 {
1079         int result = 0;
1080         struct acpi_thermal *tz = NULL;
1081 
1082 
1083         if (!device)
1084                 return -EINVAL;
1085 
1086         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1087         if (!tz)
1088                 return -ENOMEM;
1089 
1090         tz->device = device;
1091         strcpy(tz->name, device->pnp.bus_id);
1092         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1093         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1094         device->driver_data = tz;
1095 
1096         result = acpi_thermal_get_info(tz);
1097         if (result)
1098                 goto free_memory;
1099 
1100         acpi_thermal_guess_offset(tz);
1101 
1102         result = acpi_thermal_register_thermal_zone(tz);
1103         if (result)
1104                 goto free_memory;
1105 
1106         INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1107 
1108         pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1109                 acpi_device_bid(device), KELVIN_TO_CELSIUS(tz->temperature));
1110         goto end;
1111 
1112 free_memory:
1113         kfree(tz);
1114 end:
1115         return result;
1116 }
1117 
1118 static int acpi_thermal_remove(struct acpi_device *device)
1119 {
1120         struct acpi_thermal *tz = NULL;
1121 
1122         if (!device || !acpi_driver_data(device))
1123                 return -EINVAL;
1124 
1125         flush_workqueue(acpi_thermal_pm_queue);
1126         tz = acpi_driver_data(device);
1127 
1128         acpi_thermal_unregister_thermal_zone(tz);
1129         kfree(tz);
1130         return 0;
1131 }
1132 
1133 #ifdef CONFIG_PM_SLEEP
1134 static int acpi_thermal_suspend(struct device *dev)
1135 {
1136         /* Make sure the previously queued thermal check work has been done */
1137         flush_workqueue(acpi_thermal_pm_queue);
1138         return 0;
1139 }
1140 
1141 static int acpi_thermal_resume(struct device *dev)
1142 {
1143         struct acpi_thermal *tz;
1144         int i, j, power_state, result;
1145 
1146         if (!dev)
1147                 return -EINVAL;
1148 
1149         tz = acpi_driver_data(to_acpi_device(dev));
1150         if (!tz)
1151                 return -EINVAL;
1152 
1153         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1154                 if (!(&tz->trips.active[i]))
1155                         break;
1156                 if (!tz->trips.active[i].flags.valid)
1157                         break;
1158                 tz->trips.active[i].flags.enabled = 1;
1159                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1160                         result = acpi_bus_update_power(
1161                                         tz->trips.active[i].devices.handles[j],
1162                                         &power_state);
1163                         if (result || (power_state != ACPI_STATE_D0)) {
1164                                 tz->trips.active[i].flags.enabled = 0;
1165                                 break;
1166                         }
1167                 }
1168                 tz->state.active |= tz->trips.active[i].flags.enabled;
1169         }
1170 
1171         queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1172 
1173         return AE_OK;
1174 }
1175 #endif
1176 
1177 static int thermal_act(const struct dmi_system_id *d) {
1178 
1179         if (act == 0) {
1180                 pr_notice(PREFIX "%s detected: "
1181                           "disabling all active thermal trip points\n", d->ident);
1182                 act = -1;
1183         }
1184         return 0;
1185 }
1186 static int thermal_nocrt(const struct dmi_system_id *d) {
1187 
1188         pr_notice(PREFIX "%s detected: "
1189                   "disabling all critical thermal trip point actions.\n", d->ident);
1190         nocrt = 1;
1191         return 0;
1192 }
1193 static int thermal_tzp(const struct dmi_system_id *d) {
1194 
1195         if (tzp == 0) {
1196                 pr_notice(PREFIX "%s detected: "
1197                           "enabling thermal zone polling\n", d->ident);
1198                 tzp = 300;      /* 300 dS = 30 Seconds */
1199         }
1200         return 0;
1201 }
1202 static int thermal_psv(const struct dmi_system_id *d) {
1203 
1204         if (psv == 0) {
1205                 pr_notice(PREFIX "%s detected: "
1206                           "disabling all passive thermal trip points\n", d->ident);
1207                 psv = -1;
1208         }
1209         return 0;
1210 }
1211 
1212 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1213         /*
1214          * Award BIOS on this AOpen makes thermal control almost worthless.
1215          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1216          */
1217         {
1218          .callback = thermal_act,
1219          .ident = "AOpen i915GMm-HFS",
1220          .matches = {
1221                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1222                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1223                 },
1224         },
1225         {
1226          .callback = thermal_psv,
1227          .ident = "AOpen i915GMm-HFS",
1228          .matches = {
1229                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1230                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1231                 },
1232         },
1233         {
1234          .callback = thermal_tzp,
1235          .ident = "AOpen i915GMm-HFS",
1236          .matches = {
1237                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1238                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1239                 },
1240         },
1241         {
1242          .callback = thermal_nocrt,
1243          .ident = "Gigabyte GA-7ZX",
1244          .matches = {
1245                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1246                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1247                 },
1248         },
1249         {}
1250 };
1251 
1252 static int __init acpi_thermal_init(void)
1253 {
1254         int result = 0;
1255 
1256         dmi_check_system(thermal_dmi_table);
1257 
1258         if (off) {
1259                 pr_notice(PREFIX "thermal control disabled\n");
1260                 return -ENODEV;
1261         }
1262 
1263         acpi_thermal_pm_queue = create_workqueue("acpi_thermal_pm");
1264         if (!acpi_thermal_pm_queue)
1265                 return -ENODEV;
1266 
1267         result = acpi_bus_register_driver(&acpi_thermal_driver);
1268         if (result < 0) {
1269                 destroy_workqueue(acpi_thermal_pm_queue);
1270                 return -ENODEV;
1271         }
1272 
1273         return 0;
1274 }
1275 
1276 static void __exit acpi_thermal_exit(void)
1277 {
1278         acpi_bus_unregister_driver(&acpi_thermal_driver);
1279         destroy_workqueue(acpi_thermal_pm_queue);
1280 
1281         return;
1282 }
1283 
1284 module_init(acpi_thermal_init);
1285 module_exit(acpi_thermal_exit);
1286 

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