Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

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 <linux/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                                    THERMAL_EVENT_UNSPECIFIED);
525 }
526 
527 /* sys I/F for generic thermal sysfs support */
528 
529 static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
530 {
531         struct acpi_thermal *tz = thermal->devdata;
532         int result;
533 
534         if (!tz)
535                 return -EINVAL;
536 
537         result = acpi_thermal_get_temperature(tz);
538         if (result)
539                 return result;
540 
541         *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(tz->temperature,
542                                                         tz->kelvin_offset);
543         return 0;
544 }
545 
546 static int thermal_get_mode(struct thermal_zone_device *thermal,
547                                 enum thermal_device_mode *mode)
548 {
549         struct acpi_thermal *tz = thermal->devdata;
550 
551         if (!tz)
552                 return -EINVAL;
553 
554         *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
555                 THERMAL_DEVICE_DISABLED;
556 
557         return 0;
558 }
559 
560 static int thermal_set_mode(struct thermal_zone_device *thermal,
561                                 enum thermal_device_mode mode)
562 {
563         struct acpi_thermal *tz = thermal->devdata;
564         int enable;
565 
566         if (!tz)
567                 return -EINVAL;
568 
569         /*
570          * enable/disable thermal management from ACPI thermal driver
571          */
572         if (mode == THERMAL_DEVICE_ENABLED)
573                 enable = 1;
574         else if (mode == THERMAL_DEVICE_DISABLED) {
575                 enable = 0;
576                 pr_warn("thermal zone will be disabled\n");
577         } else
578                 return -EINVAL;
579 
580         if (enable != tz->tz_enabled) {
581                 tz->tz_enabled = enable;
582                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
583                         "%s kernel ACPI thermal control\n",
584                         tz->tz_enabled ? "Enable" : "Disable"));
585                 acpi_thermal_check(tz);
586         }
587         return 0;
588 }
589 
590 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
591                                  int trip, enum thermal_trip_type *type)
592 {
593         struct acpi_thermal *tz = thermal->devdata;
594         int i;
595 
596         if (!tz || trip < 0)
597                 return -EINVAL;
598 
599         if (tz->trips.critical.flags.valid) {
600                 if (!trip) {
601                         *type = THERMAL_TRIP_CRITICAL;
602                         return 0;
603                 }
604                 trip--;
605         }
606 
607         if (tz->trips.hot.flags.valid) {
608                 if (!trip) {
609                         *type = THERMAL_TRIP_HOT;
610                         return 0;
611                 }
612                 trip--;
613         }
614 
615         if (tz->trips.passive.flags.valid) {
616                 if (!trip) {
617                         *type = THERMAL_TRIP_PASSIVE;
618                         return 0;
619                 }
620                 trip--;
621         }
622 
623         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
624                 tz->trips.active[i].flags.valid; i++) {
625                 if (!trip) {
626                         *type = THERMAL_TRIP_ACTIVE;
627                         return 0;
628                 }
629                 trip--;
630         }
631 
632         return -EINVAL;
633 }
634 
635 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
636                                  int trip, int *temp)
637 {
638         struct acpi_thermal *tz = thermal->devdata;
639         int i;
640 
641         if (!tz || trip < 0)
642                 return -EINVAL;
643 
644         if (tz->trips.critical.flags.valid) {
645                 if (!trip) {
646                         *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
647                                 tz->trips.critical.temperature,
648                                 tz->kelvin_offset);
649                         return 0;
650                 }
651                 trip--;
652         }
653 
654         if (tz->trips.hot.flags.valid) {
655                 if (!trip) {
656                         *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
657                                 tz->trips.hot.temperature,
658                                 tz->kelvin_offset);
659                         return 0;
660                 }
661                 trip--;
662         }
663 
664         if (tz->trips.passive.flags.valid) {
665                 if (!trip) {
666                         *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
667                                 tz->trips.passive.temperature,
668                                 tz->kelvin_offset);
669                         return 0;
670                 }
671                 trip--;
672         }
673 
674         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
675                 tz->trips.active[i].flags.valid; i++) {
676                 if (!trip) {
677                         *temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
678                                 tz->trips.active[i].temperature,
679                                 tz->kelvin_offset);
680                         return 0;
681                 }
682                 trip--;
683         }
684 
685         return -EINVAL;
686 }
687 
688 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
689                                 int *temperature)
690 {
691         struct acpi_thermal *tz = thermal->devdata;
692 
693         if (tz->trips.critical.flags.valid) {
694                 *temperature = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
695                                 tz->trips.critical.temperature,
696                                 tz->kelvin_offset);
697                 return 0;
698         } else
699                 return -EINVAL;
700 }
701 
702 static int thermal_get_trend(struct thermal_zone_device *thermal,
703                                 int trip, enum thermal_trend *trend)
704 {
705         struct acpi_thermal *tz = thermal->devdata;
706         enum thermal_trip_type type;
707         int i;
708 
709         if (thermal_get_trip_type(thermal, trip, &type))
710                 return -EINVAL;
711 
712         if (type == THERMAL_TRIP_ACTIVE) {
713                 int trip_temp;
714                 int temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
715                                         tz->temperature, tz->kelvin_offset);
716                 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
717                         return -EINVAL;
718 
719                 if (temp > trip_temp) {
720                         *trend = THERMAL_TREND_RAISING;
721                         return 0;
722                 } else {
723                         /* Fall back on default trend */
724                         return -EINVAL;
725                 }
726         }
727 
728         /*
729          * tz->temperature has already been updated by generic thermal layer,
730          * before this callback being invoked
731          */
732         i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
733                 + (tz->trips.passive.tc2
734                 * (tz->temperature - tz->trips.passive.temperature));
735 
736         if (i > 0)
737                 *trend = THERMAL_TREND_RAISING;
738         else if (i < 0)
739                 *trend = THERMAL_TREND_DROPPING;
740         else
741                 *trend = THERMAL_TREND_STABLE;
742         return 0;
743 }
744 
745 
746 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
747                            enum thermal_trip_type trip_type)
748 {
749         u8 type = 0;
750         struct acpi_thermal *tz = thermal->devdata;
751 
752         if (trip_type == THERMAL_TRIP_CRITICAL)
753                 type = ACPI_THERMAL_NOTIFY_CRITICAL;
754         else if (trip_type == THERMAL_TRIP_HOT)
755                 type = ACPI_THERMAL_NOTIFY_HOT;
756         else
757                 return 0;
758 
759         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
760                                         dev_name(&tz->device->dev), type, 1);
761 
762         if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
763                 return 1;
764 
765         return 0;
766 }
767 
768 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
769                                         struct thermal_cooling_device *cdev,
770                                         bool bind)
771 {
772         struct acpi_device *device = cdev->devdata;
773         struct acpi_thermal *tz = thermal->devdata;
774         struct acpi_device *dev;
775         acpi_status status;
776         acpi_handle handle;
777         int i;
778         int j;
779         int trip = -1;
780         int result = 0;
781 
782         if (tz->trips.critical.flags.valid)
783                 trip++;
784 
785         if (tz->trips.hot.flags.valid)
786                 trip++;
787 
788         if (tz->trips.passive.flags.valid) {
789                 trip++;
790                 for (i = 0; i < tz->trips.passive.devices.count;
791                     i++) {
792                         handle = tz->trips.passive.devices.handles[i];
793                         status = acpi_bus_get_device(handle, &dev);
794                         if (ACPI_FAILURE(status) || dev != device)
795                                 continue;
796                         if (bind)
797                                 result =
798                                         thermal_zone_bind_cooling_device
799                                         (thermal, trip, cdev,
800                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
801                                          THERMAL_WEIGHT_DEFAULT);
802                         else
803                                 result =
804                                         thermal_zone_unbind_cooling_device
805                                         (thermal, trip, cdev);
806                         if (result)
807                                 goto failed;
808                 }
809         }
810 
811         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
812                 if (!tz->trips.active[i].flags.valid)
813                         break;
814                 trip++;
815                 for (j = 0;
816                     j < tz->trips.active[i].devices.count;
817                     j++) {
818                         handle = tz->trips.active[i].devices.handles[j];
819                         status = acpi_bus_get_device(handle, &dev);
820                         if (ACPI_FAILURE(status) || dev != device)
821                                 continue;
822                         if (bind)
823                                 result = thermal_zone_bind_cooling_device
824                                         (thermal, trip, cdev,
825                                          THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
826                                          THERMAL_WEIGHT_DEFAULT);
827                         else
828                                 result = thermal_zone_unbind_cooling_device
829                                         (thermal, trip, cdev);
830                         if (result)
831                                 goto failed;
832                 }
833         }
834 
835         for (i = 0; i < tz->devices.count; i++) {
836                 handle = tz->devices.handles[i];
837                 status = acpi_bus_get_device(handle, &dev);
838                 if (ACPI_SUCCESS(status) && (dev == device)) {
839                         if (bind)
840                                 result = thermal_zone_bind_cooling_device
841                                                 (thermal, THERMAL_TRIPS_NONE,
842                                                  cdev, THERMAL_NO_LIMIT,
843                                                  THERMAL_NO_LIMIT,
844                                                  THERMAL_WEIGHT_DEFAULT);
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), DECI_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 = alloc_workqueue("acpi_thermal_pm",
1264                                                 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1265         if (!acpi_thermal_pm_queue)
1266                 return -ENODEV;
1267 
1268         result = acpi_bus_register_driver(&acpi_thermal_driver);
1269         if (result < 0) {
1270                 destroy_workqueue(acpi_thermal_pm_queue);
1271                 return -ENODEV;
1272         }
1273 
1274         return 0;
1275 }
1276 
1277 static void __exit acpi_thermal_exit(void)
1278 {
1279         acpi_bus_unregister_driver(&acpi_thermal_driver);
1280         destroy_workqueue(acpi_thermal_pm_queue);
1281 
1282         return;
1283 }
1284 
1285 module_init(acpi_thermal_init);
1286 module_exit(acpi_thermal_exit);
1287 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us