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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
4 *
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 *
8 * This driver fully implements the ACPI thermal policy as described in the
9 * ACPI 2.0 Specification.
10 *
11 * TBD: 1. Implement passive cooling hysteresis.
12 * 2. Enhance passive cooling (CPU) states/limit interface to support
13 * concepts of 'multiple limiters', upper/lower limits, etc.
14 */
15
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/dmi.h>
19#include <linux/init.h>
20#include <linux/slab.h>
21#include <linux/types.h>
22#include <linux/jiffies.h>
23#include <linux/kmod.h>
24#include <linux/reboot.h>
25#include <linux/device.h>
26#include <linux/thermal.h>
27#include <linux/acpi.h>
28#include <linux/workqueue.h>
29#include <linux/uaccess.h>
30#include <linux/units.h>
31
32#define PREFIX "ACPI: "
33
34#define ACPI_THERMAL_CLASS "thermal_zone"
35#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
36#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
37#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
38#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
39#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
40#define ACPI_THERMAL_NOTIFY_HOT 0xF1
41#define ACPI_THERMAL_MODE_ACTIVE 0x00
42
43#define ACPI_THERMAL_MAX_ACTIVE 10
44#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
45
46#define _COMPONENT ACPI_THERMAL_COMPONENT
47ACPI_MODULE_NAME("thermal");
48
49MODULE_AUTHOR("Paul Diefenbaugh");
50MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
51MODULE_LICENSE("GPL");
52
53static int act;
54module_param(act, int, 0644);
55MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
56
57static int crt;
58module_param(crt, int, 0644);
59MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
60
61static int tzp;
62module_param(tzp, int, 0444);
63MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
64
65static int nocrt;
66module_param(nocrt, int, 0);
67MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
68
69static int off;
70module_param(off, int, 0);
71MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
72
73static int psv;
74module_param(psv, int, 0644);
75MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
76
77static struct workqueue_struct *acpi_thermal_pm_queue;
78
79static int acpi_thermal_add(struct acpi_device *device);
80static int acpi_thermal_remove(struct acpi_device *device);
81static void acpi_thermal_notify(struct acpi_device *device, u32 event);
82
83static const struct acpi_device_id thermal_device_ids[] = {
84 {ACPI_THERMAL_HID, 0},
85 {"", 0},
86};
87MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
88
89#ifdef CONFIG_PM_SLEEP
90static int acpi_thermal_suspend(struct device *dev);
91static int acpi_thermal_resume(struct device *dev);
92#else
93#define acpi_thermal_suspend NULL
94#define acpi_thermal_resume NULL
95#endif
96static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
97
98static struct acpi_driver acpi_thermal_driver = {
99 .name = "thermal",
100 .class = ACPI_THERMAL_CLASS,
101 .ids = thermal_device_ids,
102 .ops = {
103 .add = acpi_thermal_add,
104 .remove = acpi_thermal_remove,
105 .notify = acpi_thermal_notify,
106 },
107 .drv.pm = &acpi_thermal_pm,
108};
109
110struct acpi_thermal_state {
111 u8 critical:1;
112 u8 hot:1;
113 u8 passive:1;
114 u8 active:1;
115 u8 reserved:4;
116 int active_index;
117};
118
119struct acpi_thermal_state_flags {
120 u8 valid:1;
121 u8 enabled:1;
122 u8 reserved:6;
123};
124
125struct acpi_thermal_critical {
126 struct acpi_thermal_state_flags flags;
127 unsigned long temperature;
128};
129
130struct acpi_thermal_hot {
131 struct acpi_thermal_state_flags flags;
132 unsigned long temperature;
133};
134
135struct acpi_thermal_passive {
136 struct acpi_thermal_state_flags flags;
137 unsigned long temperature;
138 unsigned long tc1;
139 unsigned long tc2;
140 unsigned long tsp;
141 struct acpi_handle_list devices;
142};
143
144struct acpi_thermal_active {
145 struct acpi_thermal_state_flags flags;
146 unsigned long temperature;
147 struct acpi_handle_list devices;
148};
149
150struct acpi_thermal_trips {
151 struct acpi_thermal_critical critical;
152 struct acpi_thermal_hot hot;
153 struct acpi_thermal_passive passive;
154 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
155};
156
157struct acpi_thermal_flags {
158 u8 cooling_mode:1; /* _SCP */
159 u8 devices:1; /* _TZD */
160 u8 reserved:6;
161};
162
163struct acpi_thermal {
164 struct acpi_device * device;
165 acpi_bus_id name;
166 unsigned long temperature;
167 unsigned long last_temperature;
168 unsigned long polling_frequency;
169 volatile u8 zombie;
170 struct acpi_thermal_flags flags;
171 struct acpi_thermal_state state;
172 struct acpi_thermal_trips trips;
173 struct acpi_handle_list devices;
174 struct thermal_zone_device *thermal_zone;
175 int kelvin_offset; /* in millidegrees */
176 struct work_struct thermal_check_work;
177};
178
179/* --------------------------------------------------------------------------
180 Thermal Zone Management
181 -------------------------------------------------------------------------- */
182
183static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
184{
185 acpi_status status = AE_OK;
186 unsigned long long tmp;
187
188 if (!tz)
189 return -EINVAL;
190
191 tz->last_temperature = tz->temperature;
192
193 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
194 if (ACPI_FAILURE(status))
195 return -ENODEV;
196
197 tz->temperature = tmp;
198 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
199 tz->temperature));
200
201 return 0;
202}
203
204static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
205{
206 acpi_status status = AE_OK;
207 unsigned long long tmp;
208
209 if (!tz)
210 return -EINVAL;
211
212 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
213 if (ACPI_FAILURE(status))
214 return -ENODEV;
215
216 tz->polling_frequency = tmp;
217 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
218 tz->polling_frequency));
219
220 return 0;
221}
222
223static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
224{
225 if (!tz)
226 return -EINVAL;
227
228 if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
229 "_SCP", mode)))
230 return -ENODEV;
231
232 return 0;
233}
234
235#define ACPI_TRIPS_CRITICAL 0x01
236#define ACPI_TRIPS_HOT 0x02
237#define ACPI_TRIPS_PASSIVE 0x04
238#define ACPI_TRIPS_ACTIVE 0x08
239#define ACPI_TRIPS_DEVICES 0x10
240
241#define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
242#define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
243
244#define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
245 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
246 ACPI_TRIPS_DEVICES)
247
248/*
249 * This exception is thrown out in two cases:
250 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
251 * when re-evaluating the AML code.
252 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
253 * We need to re-bind the cooling devices of a thermal zone when this occurs.
254 */
255#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
256do { \
257 if (flags != ACPI_TRIPS_INIT) \
258 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
259 "ACPI thermal trip point %s changed\n" \
260 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
261} while (0)
262
263static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
264{
265 acpi_status status = AE_OK;
266 unsigned long long tmp;
267 struct acpi_handle_list devices;
268 int valid = 0;
269 int i;
270
271 /* Critical Shutdown */
272 if (flag & ACPI_TRIPS_CRITICAL) {
273 status = acpi_evaluate_integer(tz->device->handle,
274 "_CRT", NULL, &tmp);
275 tz->trips.critical.temperature = tmp;
276 /*
277 * Treat freezing temperatures as invalid as well; some
278 * BIOSes return really low values and cause reboots at startup.
279 * Below zero (Celsius) values clearly aren't right for sure..
280 * ... so lets discard those as invalid.
281 */
282 if (ACPI_FAILURE(status)) {
283 tz->trips.critical.flags.valid = 0;
284 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
285 "No critical threshold\n"));
286 } else if (tmp <= 2732) {
287 pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
288 tmp);
289 tz->trips.critical.flags.valid = 0;
290 } else {
291 tz->trips.critical.flags.valid = 1;
292 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
293 "Found critical threshold [%lu]\n",
294 tz->trips.critical.temperature));
295 }
296 if (tz->trips.critical.flags.valid == 1) {
297 if (crt == -1) {
298 tz->trips.critical.flags.valid = 0;
299 } else if (crt > 0) {
300 unsigned long crt_k = celsius_to_deci_kelvin(crt);
301
302 /*
303 * Allow override critical threshold
304 */
305 if (crt_k > tz->trips.critical.temperature)
306 pr_warn(PREFIX "Critical threshold %d C\n",
307 crt);
308 tz->trips.critical.temperature = crt_k;
309 }
310 }
311 }
312
313 /* Critical Sleep (optional) */
314 if (flag & ACPI_TRIPS_HOT) {
315 status = acpi_evaluate_integer(tz->device->handle,
316 "_HOT", NULL, &tmp);
317 if (ACPI_FAILURE(status)) {
318 tz->trips.hot.flags.valid = 0;
319 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
320 "No hot threshold\n"));
321 } else {
322 tz->trips.hot.temperature = tmp;
323 tz->trips.hot.flags.valid = 1;
324 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
325 "Found hot threshold [%lu]\n",
326 tz->trips.hot.temperature));
327 }
328 }
329
330 /* Passive (optional) */
331 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
332 (flag == ACPI_TRIPS_INIT)) {
333 valid = tz->trips.passive.flags.valid;
334 if (psv == -1) {
335 status = AE_SUPPORT;
336 } else if (psv > 0) {
337 tmp = celsius_to_deci_kelvin(psv);
338 status = AE_OK;
339 } else {
340 status = acpi_evaluate_integer(tz->device->handle,
341 "_PSV", NULL, &tmp);
342 }
343
344 if (ACPI_FAILURE(status))
345 tz->trips.passive.flags.valid = 0;
346 else {
347 tz->trips.passive.temperature = tmp;
348 tz->trips.passive.flags.valid = 1;
349 if (flag == ACPI_TRIPS_INIT) {
350 status = acpi_evaluate_integer(
351 tz->device->handle, "_TC1",
352 NULL, &tmp);
353 if (ACPI_FAILURE(status))
354 tz->trips.passive.flags.valid = 0;
355 else
356 tz->trips.passive.tc1 = tmp;
357 status = acpi_evaluate_integer(
358 tz->device->handle, "_TC2",
359 NULL, &tmp);
360 if (ACPI_FAILURE(status))
361 tz->trips.passive.flags.valid = 0;
362 else
363 tz->trips.passive.tc2 = tmp;
364 status = acpi_evaluate_integer(
365 tz->device->handle, "_TSP",
366 NULL, &tmp);
367 if (ACPI_FAILURE(status))
368 tz->trips.passive.flags.valid = 0;
369 else
370 tz->trips.passive.tsp = tmp;
371 }
372 }
373 }
374 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
375 memset(&devices, 0, sizeof(struct acpi_handle_list));
376 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
377 NULL, &devices);
378 if (ACPI_FAILURE(status)) {
379 pr_warn(PREFIX "Invalid passive threshold\n");
380 tz->trips.passive.flags.valid = 0;
381 }
382 else
383 tz->trips.passive.flags.valid = 1;
384
385 if (memcmp(&tz->trips.passive.devices, &devices,
386 sizeof(struct acpi_handle_list))) {
387 memcpy(&tz->trips.passive.devices, &devices,
388 sizeof(struct acpi_handle_list));
389 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
390 }
391 }
392 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
393 if (valid != tz->trips.passive.flags.valid)
394 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
395 }
396
397 /* Active (optional) */
398 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
399 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
400 valid = tz->trips.active[i].flags.valid;
401
402 if (act == -1)
403 break; /* disable all active trip points */
404
405 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
406 tz->trips.active[i].flags.valid)) {
407 status = acpi_evaluate_integer(tz->device->handle,
408 name, NULL, &tmp);
409 if (ACPI_FAILURE(status)) {
410 tz->trips.active[i].flags.valid = 0;
411 if (i == 0)
412 break;
413 if (act <= 0)
414 break;
415 if (i == 1)
416 tz->trips.active[0].temperature =
417 celsius_to_deci_kelvin(act);
418 else
419 /*
420 * Don't allow override higher than
421 * the next higher trip point
422 */
423 tz->trips.active[i - 1].temperature =
424 (tz->trips.active[i - 2].temperature <
425 celsius_to_deci_kelvin(act) ?
426 tz->trips.active[i - 2].temperature :
427 celsius_to_deci_kelvin(act));
428 break;
429 } else {
430 tz->trips.active[i].temperature = tmp;
431 tz->trips.active[i].flags.valid = 1;
432 }
433 }
434
435 name[2] = 'L';
436 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
437 memset(&devices, 0, sizeof(struct acpi_handle_list));
438 status = acpi_evaluate_reference(tz->device->handle,
439 name, NULL, &devices);
440 if (ACPI_FAILURE(status)) {
441 pr_warn(PREFIX "Invalid active%d threshold\n",
442 i);
443 tz->trips.active[i].flags.valid = 0;
444 }
445 else
446 tz->trips.active[i].flags.valid = 1;
447
448 if (memcmp(&tz->trips.active[i].devices, &devices,
449 sizeof(struct acpi_handle_list))) {
450 memcpy(&tz->trips.active[i].devices, &devices,
451 sizeof(struct acpi_handle_list));
452 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
453 }
454 }
455 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
456 if (valid != tz->trips.active[i].flags.valid)
457 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
458
459 if (!tz->trips.active[i].flags.valid)
460 break;
461 }
462
463 if (flag & ACPI_TRIPS_DEVICES) {
464 memset(&devices, 0, sizeof(devices));
465 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
466 NULL, &devices);
467 if (ACPI_SUCCESS(status)
468 && memcmp(&tz->devices, &devices, sizeof(devices))) {
469 tz->devices = devices;
470 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
471 }
472 }
473
474 return 0;
475}
476
477static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
478{
479 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
480
481 if (ret)
482 return ret;
483
484 valid = tz->trips.critical.flags.valid |
485 tz->trips.hot.flags.valid |
486 tz->trips.passive.flags.valid;
487
488 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
489 valid |= tz->trips.active[i].flags.valid;
490
491 if (!valid) {
492 pr_warn(FW_BUG "No valid trip found\n");
493 return -ENODEV;
494 }
495 return 0;
496}
497
498static void acpi_thermal_check(void *data)
499{
500 struct acpi_thermal *tz = data;
501
502 thermal_zone_device_update(tz->thermal_zone,
503 THERMAL_EVENT_UNSPECIFIED);
504}
505
506/* sys I/F for generic thermal sysfs support */
507
508static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
509{
510 struct acpi_thermal *tz = thermal->devdata;
511 int result;
512
513 if (!tz)
514 return -EINVAL;
515
516 result = acpi_thermal_get_temperature(tz);
517 if (result)
518 return result;
519
520 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temperature,
521 tz->kelvin_offset);
522 return 0;
523}
524
525static int thermal_get_trip_type(struct thermal_zone_device *thermal,
526 int trip, enum thermal_trip_type *type)
527{
528 struct acpi_thermal *tz = thermal->devdata;
529 int i;
530
531 if (!tz || trip < 0)
532 return -EINVAL;
533
534 if (tz->trips.critical.flags.valid) {
535 if (!trip) {
536 *type = THERMAL_TRIP_CRITICAL;
537 return 0;
538 }
539 trip--;
540 }
541
542 if (tz->trips.hot.flags.valid) {
543 if (!trip) {
544 *type = THERMAL_TRIP_HOT;
545 return 0;
546 }
547 trip--;
548 }
549
550 if (tz->trips.passive.flags.valid) {
551 if (!trip) {
552 *type = THERMAL_TRIP_PASSIVE;
553 return 0;
554 }
555 trip--;
556 }
557
558 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
559 tz->trips.active[i].flags.valid; i++) {
560 if (!trip) {
561 *type = THERMAL_TRIP_ACTIVE;
562 return 0;
563 }
564 trip--;
565 }
566
567 return -EINVAL;
568}
569
570static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
571 int trip, int *temp)
572{
573 struct acpi_thermal *tz = thermal->devdata;
574 int i;
575
576 if (!tz || trip < 0)
577 return -EINVAL;
578
579 if (tz->trips.critical.flags.valid) {
580 if (!trip) {
581 *temp = deci_kelvin_to_millicelsius_with_offset(
582 tz->trips.critical.temperature,
583 tz->kelvin_offset);
584 return 0;
585 }
586 trip--;
587 }
588
589 if (tz->trips.hot.flags.valid) {
590 if (!trip) {
591 *temp = deci_kelvin_to_millicelsius_with_offset(
592 tz->trips.hot.temperature,
593 tz->kelvin_offset);
594 return 0;
595 }
596 trip--;
597 }
598
599 if (tz->trips.passive.flags.valid) {
600 if (!trip) {
601 *temp = deci_kelvin_to_millicelsius_with_offset(
602 tz->trips.passive.temperature,
603 tz->kelvin_offset);
604 return 0;
605 }
606 trip--;
607 }
608
609 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
610 tz->trips.active[i].flags.valid; i++) {
611 if (!trip) {
612 *temp = deci_kelvin_to_millicelsius_with_offset(
613 tz->trips.active[i].temperature,
614 tz->kelvin_offset);
615 return 0;
616 }
617 trip--;
618 }
619
620 return -EINVAL;
621}
622
623static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
624 int *temperature)
625{
626 struct acpi_thermal *tz = thermal->devdata;
627
628 if (tz->trips.critical.flags.valid) {
629 *temperature = deci_kelvin_to_millicelsius_with_offset(
630 tz->trips.critical.temperature,
631 tz->kelvin_offset);
632 return 0;
633 } else
634 return -EINVAL;
635}
636
637static int thermal_get_trend(struct thermal_zone_device *thermal,
638 int trip, enum thermal_trend *trend)
639{
640 struct acpi_thermal *tz = thermal->devdata;
641 enum thermal_trip_type type;
642 int i;
643
644 if (thermal_get_trip_type(thermal, trip, &type))
645 return -EINVAL;
646
647 if (type == THERMAL_TRIP_ACTIVE) {
648 int trip_temp;
649 int temp = deci_kelvin_to_millicelsius_with_offset(
650 tz->temperature, tz->kelvin_offset);
651 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
652 return -EINVAL;
653
654 if (temp > trip_temp) {
655 *trend = THERMAL_TREND_RAISING;
656 return 0;
657 } else {
658 /* Fall back on default trend */
659 return -EINVAL;
660 }
661 }
662
663 /*
664 * tz->temperature has already been updated by generic thermal layer,
665 * before this callback being invoked
666 */
667 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
668 + (tz->trips.passive.tc2
669 * (tz->temperature - tz->trips.passive.temperature));
670
671 if (i > 0)
672 *trend = THERMAL_TREND_RAISING;
673 else if (i < 0)
674 *trend = THERMAL_TREND_DROPPING;
675 else
676 *trend = THERMAL_TREND_STABLE;
677 return 0;
678}
679
680
681static int thermal_notify(struct thermal_zone_device *thermal, int trip,
682 enum thermal_trip_type trip_type)
683{
684 u8 type = 0;
685 struct acpi_thermal *tz = thermal->devdata;
686
687 if (trip_type == THERMAL_TRIP_CRITICAL)
688 type = ACPI_THERMAL_NOTIFY_CRITICAL;
689 else if (trip_type == THERMAL_TRIP_HOT)
690 type = ACPI_THERMAL_NOTIFY_HOT;
691 else
692 return 0;
693
694 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
695 dev_name(&tz->device->dev), type, 1);
696
697 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
698 return 1;
699
700 return 0;
701}
702
703static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
704 struct thermal_cooling_device *cdev,
705 bool bind)
706{
707 struct acpi_device *device = cdev->devdata;
708 struct acpi_thermal *tz = thermal->devdata;
709 struct acpi_device *dev;
710 acpi_status status;
711 acpi_handle handle;
712 int i;
713 int j;
714 int trip = -1;
715 int result = 0;
716
717 if (tz->trips.critical.flags.valid)
718 trip++;
719
720 if (tz->trips.hot.flags.valid)
721 trip++;
722
723 if (tz->trips.passive.flags.valid) {
724 trip++;
725 for (i = 0; i < tz->trips.passive.devices.count;
726 i++) {
727 handle = tz->trips.passive.devices.handles[i];
728 status = acpi_bus_get_device(handle, &dev);
729 if (ACPI_FAILURE(status) || dev != device)
730 continue;
731 if (bind)
732 result =
733 thermal_zone_bind_cooling_device
734 (thermal, trip, cdev,
735 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
736 THERMAL_WEIGHT_DEFAULT);
737 else
738 result =
739 thermal_zone_unbind_cooling_device
740 (thermal, trip, cdev);
741 if (result)
742 goto failed;
743 }
744 }
745
746 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
747 if (!tz->trips.active[i].flags.valid)
748 break;
749 trip++;
750 for (j = 0;
751 j < tz->trips.active[i].devices.count;
752 j++) {
753 handle = tz->trips.active[i].devices.handles[j];
754 status = acpi_bus_get_device(handle, &dev);
755 if (ACPI_FAILURE(status) || dev != device)
756 continue;
757 if (bind)
758 result = thermal_zone_bind_cooling_device
759 (thermal, trip, cdev,
760 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
761 THERMAL_WEIGHT_DEFAULT);
762 else
763 result = thermal_zone_unbind_cooling_device
764 (thermal, trip, cdev);
765 if (result)
766 goto failed;
767 }
768 }
769
770 for (i = 0; i < tz->devices.count; i++) {
771 handle = tz->devices.handles[i];
772 status = acpi_bus_get_device(handle, &dev);
773 if (ACPI_SUCCESS(status) && (dev == device)) {
774 if (bind)
775 result = thermal_zone_bind_cooling_device
776 (thermal, THERMAL_TRIPS_NONE,
777 cdev, THERMAL_NO_LIMIT,
778 THERMAL_NO_LIMIT,
779 THERMAL_WEIGHT_DEFAULT);
780 else
781 result = thermal_zone_unbind_cooling_device
782 (thermal, THERMAL_TRIPS_NONE,
783 cdev);
784 if (result)
785 goto failed;
786 }
787 }
788
789failed:
790 return result;
791}
792
793static int
794acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
795 struct thermal_cooling_device *cdev)
796{
797 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
798}
799
800static int
801acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
802 struct thermal_cooling_device *cdev)
803{
804 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
805}
806
807static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
808 .bind = acpi_thermal_bind_cooling_device,
809 .unbind = acpi_thermal_unbind_cooling_device,
810 .get_temp = thermal_get_temp,
811 .get_trip_type = thermal_get_trip_type,
812 .get_trip_temp = thermal_get_trip_temp,
813 .get_crit_temp = thermal_get_crit_temp,
814 .get_trend = thermal_get_trend,
815 .notify = thermal_notify,
816};
817
818static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
819{
820 int trips = 0;
821 int result;
822 acpi_status status;
823 int i;
824
825 if (tz->trips.critical.flags.valid)
826 trips++;
827
828 if (tz->trips.hot.flags.valid)
829 trips++;
830
831 if (tz->trips.passive.flags.valid)
832 trips++;
833
834 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
835 tz->trips.active[i].flags.valid; i++, trips++);
836
837 if (tz->trips.passive.flags.valid)
838 tz->thermal_zone =
839 thermal_zone_device_register("acpitz", trips, 0, tz,
840 &acpi_thermal_zone_ops, NULL,
841 tz->trips.passive.tsp*100,
842 tz->polling_frequency*100);
843 else
844 tz->thermal_zone =
845 thermal_zone_device_register("acpitz", trips, 0, tz,
846 &acpi_thermal_zone_ops, NULL,
847 0, tz->polling_frequency*100);
848 if (IS_ERR(tz->thermal_zone))
849 return -ENODEV;
850
851 result = sysfs_create_link(&tz->device->dev.kobj,
852 &tz->thermal_zone->device.kobj, "thermal_zone");
853 if (result)
854 goto unregister_tzd;
855
856 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
857 &tz->device->dev.kobj, "device");
858 if (result)
859 goto remove_tz_link;
860
861 status = acpi_bus_attach_private_data(tz->device->handle,
862 tz->thermal_zone);
863 if (ACPI_FAILURE(status)) {
864 result = -ENODEV;
865 goto remove_dev_link;
866 }
867
868 result = thermal_zone_device_enable(tz->thermal_zone);
869 if (result)
870 goto acpi_bus_detach;
871
872 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
873 tz->thermal_zone->id);
874
875 return 0;
876
877acpi_bus_detach:
878 acpi_bus_detach_private_data(tz->device->handle);
879remove_dev_link:
880 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
881remove_tz_link:
882 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
883unregister_tzd:
884 thermal_zone_device_unregister(tz->thermal_zone);
885
886 return result;
887}
888
889static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
890{
891 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
892 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
893 thermal_zone_device_unregister(tz->thermal_zone);
894 tz->thermal_zone = NULL;
895 acpi_bus_detach_private_data(tz->device->handle);
896}
897
898
899/* --------------------------------------------------------------------------
900 Driver Interface
901 -------------------------------------------------------------------------- */
902
903static void acpi_thermal_notify(struct acpi_device *device, u32 event)
904{
905 struct acpi_thermal *tz = acpi_driver_data(device);
906
907
908 if (!tz)
909 return;
910
911 switch (event) {
912 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
913 acpi_thermal_check(tz);
914 break;
915 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
916 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
917 acpi_thermal_check(tz);
918 acpi_bus_generate_netlink_event(device->pnp.device_class,
919 dev_name(&device->dev), event, 0);
920 break;
921 case ACPI_THERMAL_NOTIFY_DEVICES:
922 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
923 acpi_thermal_check(tz);
924 acpi_bus_generate_netlink_event(device->pnp.device_class,
925 dev_name(&device->dev), event, 0);
926 break;
927 default:
928 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
929 "Unsupported event [0x%x]\n", event));
930 break;
931 }
932}
933
934/*
935 * On some platforms, the AML code has dependency about
936 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
937 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
938 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
939 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
940 * if _TMP has never been evaluated.
941 *
942 * As this dependency is totally transparent to OS, evaluate
943 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
944 * _TMP, before they are actually used.
945 */
946static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
947{
948 acpi_handle handle = tz->device->handle;
949 unsigned long long value;
950 int i;
951
952 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
953 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
954 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
955 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
956 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
957 acpi_status status;
958
959 status = acpi_evaluate_integer(handle, name, NULL, &value);
960 if (status == AE_NOT_FOUND)
961 break;
962 }
963 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
964}
965
966static int acpi_thermal_get_info(struct acpi_thermal *tz)
967{
968 int result = 0;
969
970
971 if (!tz)
972 return -EINVAL;
973
974 acpi_thermal_aml_dependency_fix(tz);
975
976 /* Get trip points [_CRT, _PSV, etc.] (required) */
977 result = acpi_thermal_get_trip_points(tz);
978 if (result)
979 return result;
980
981 /* Get temperature [_TMP] (required) */
982 result = acpi_thermal_get_temperature(tz);
983 if (result)
984 return result;
985
986 /* Set the cooling mode [_SCP] to active cooling (default) */
987 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
988 if (!result)
989 tz->flags.cooling_mode = 1;
990
991 /* Get default polling frequency [_TZP] (optional) */
992 if (tzp)
993 tz->polling_frequency = tzp;
994 else
995 acpi_thermal_get_polling_frequency(tz);
996
997 return 0;
998}
999
1000/*
1001 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1002 * handles temperature values with a single decimal place. As a consequence,
1003 * some implementations use an offset of 273.1 and others use an offset of
1004 * 273.2. Try to find out which one is being used, to present the most
1005 * accurate and visually appealing number.
1006 *
1007 * The heuristic below should work for all ACPI thermal zones which have a
1008 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1009 */
1010static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1011{
1012 if (tz->trips.critical.flags.valid &&
1013 (tz->trips.critical.temperature % 5) == 1)
1014 tz->kelvin_offset = 273100;
1015 else
1016 tz->kelvin_offset = 273200;
1017}
1018
1019static void acpi_thermal_check_fn(struct work_struct *work)
1020{
1021 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1022 thermal_check_work);
1023 acpi_thermal_check(tz);
1024}
1025
1026static int acpi_thermal_add(struct acpi_device *device)
1027{
1028 int result = 0;
1029 struct acpi_thermal *tz = NULL;
1030
1031
1032 if (!device)
1033 return -EINVAL;
1034
1035 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1036 if (!tz)
1037 return -ENOMEM;
1038
1039 tz->device = device;
1040 strcpy(tz->name, device->pnp.bus_id);
1041 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1042 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1043 device->driver_data = tz;
1044
1045 result = acpi_thermal_get_info(tz);
1046 if (result)
1047 goto free_memory;
1048
1049 acpi_thermal_guess_offset(tz);
1050
1051 result = acpi_thermal_register_thermal_zone(tz);
1052 if (result)
1053 goto free_memory;
1054
1055 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1056
1057 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1058 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature));
1059 goto end;
1060
1061free_memory:
1062 kfree(tz);
1063end:
1064 return result;
1065}
1066
1067static int acpi_thermal_remove(struct acpi_device *device)
1068{
1069 struct acpi_thermal *tz = NULL;
1070
1071 if (!device || !acpi_driver_data(device))
1072 return -EINVAL;
1073
1074 flush_workqueue(acpi_thermal_pm_queue);
1075 tz = acpi_driver_data(device);
1076
1077 acpi_thermal_unregister_thermal_zone(tz);
1078 kfree(tz);
1079 return 0;
1080}
1081
1082#ifdef CONFIG_PM_SLEEP
1083static int acpi_thermal_suspend(struct device *dev)
1084{
1085 /* Make sure the previously queued thermal check work has been done */
1086 flush_workqueue(acpi_thermal_pm_queue);
1087 return 0;
1088}
1089
1090static int acpi_thermal_resume(struct device *dev)
1091{
1092 struct acpi_thermal *tz;
1093 int i, j, power_state, result;
1094
1095 if (!dev)
1096 return -EINVAL;
1097
1098 tz = acpi_driver_data(to_acpi_device(dev));
1099 if (!tz)
1100 return -EINVAL;
1101
1102 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1103 if (!(&tz->trips.active[i]))
1104 break;
1105 if (!tz->trips.active[i].flags.valid)
1106 break;
1107 tz->trips.active[i].flags.enabled = 1;
1108 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1109 result = acpi_bus_update_power(
1110 tz->trips.active[i].devices.handles[j],
1111 &power_state);
1112 if (result || (power_state != ACPI_STATE_D0)) {
1113 tz->trips.active[i].flags.enabled = 0;
1114 break;
1115 }
1116 }
1117 tz->state.active |= tz->trips.active[i].flags.enabled;
1118 }
1119
1120 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1121
1122 return AE_OK;
1123}
1124#endif
1125
1126static int thermal_act(const struct dmi_system_id *d) {
1127
1128 if (act == 0) {
1129 pr_notice(PREFIX "%s detected: "
1130 "disabling all active thermal trip points\n", d->ident);
1131 act = -1;
1132 }
1133 return 0;
1134}
1135static int thermal_nocrt(const struct dmi_system_id *d) {
1136
1137 pr_notice(PREFIX "%s detected: "
1138 "disabling all critical thermal trip point actions.\n", d->ident);
1139 nocrt = 1;
1140 return 0;
1141}
1142static int thermal_tzp(const struct dmi_system_id *d) {
1143
1144 if (tzp == 0) {
1145 pr_notice(PREFIX "%s detected: "
1146 "enabling thermal zone polling\n", d->ident);
1147 tzp = 300; /* 300 dS = 30 Seconds */
1148 }
1149 return 0;
1150}
1151static int thermal_psv(const struct dmi_system_id *d) {
1152
1153 if (psv == 0) {
1154 pr_notice(PREFIX "%s detected: "
1155 "disabling all passive thermal trip points\n", d->ident);
1156 psv = -1;
1157 }
1158 return 0;
1159}
1160
1161static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1162 /*
1163 * Award BIOS on this AOpen makes thermal control almost worthless.
1164 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1165 */
1166 {
1167 .callback = thermal_act,
1168 .ident = "AOpen i915GMm-HFS",
1169 .matches = {
1170 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1171 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1172 },
1173 },
1174 {
1175 .callback = thermal_psv,
1176 .ident = "AOpen i915GMm-HFS",
1177 .matches = {
1178 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1179 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1180 },
1181 },
1182 {
1183 .callback = thermal_tzp,
1184 .ident = "AOpen i915GMm-HFS",
1185 .matches = {
1186 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1187 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1188 },
1189 },
1190 {
1191 .callback = thermal_nocrt,
1192 .ident = "Gigabyte GA-7ZX",
1193 .matches = {
1194 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1195 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1196 },
1197 },
1198 {}
1199};
1200
1201static int __init acpi_thermal_init(void)
1202{
1203 int result = 0;
1204
1205 dmi_check_system(thermal_dmi_table);
1206
1207 if (off) {
1208 pr_notice(PREFIX "thermal control disabled\n");
1209 return -ENODEV;
1210 }
1211
1212 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1213 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1214 if (!acpi_thermal_pm_queue)
1215 return -ENODEV;
1216
1217 result = acpi_bus_register_driver(&acpi_thermal_driver);
1218 if (result < 0) {
1219 destroy_workqueue(acpi_thermal_pm_queue);
1220 return -ENODEV;
1221 }
1222
1223 return 0;
1224}
1225
1226static void __exit acpi_thermal_exit(void)
1227{
1228 acpi_bus_unregister_driver(&acpi_thermal_driver);
1229 destroy_workqueue(acpi_thermal_pm_queue);
1230
1231 return;
1232}
1233
1234module_init(acpi_thermal_init);
1235module_exit(acpi_thermal_exit);
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
64ACPI_MODULE_NAME("thermal");
65
66MODULE_AUTHOR("Paul Diefenbaugh");
67MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
68MODULE_LICENSE("GPL");
69
70static int act;
71module_param(act, int, 0644);
72MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
73
74static int crt;
75module_param(crt, int, 0644);
76MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
77
78static int tzp;
79module_param(tzp, int, 0444);
80MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
81
82static int nocrt;
83module_param(nocrt, int, 0);
84MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
85
86static int off;
87module_param(off, int, 0);
88MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
89
90static int psv;
91module_param(psv, int, 0644);
92MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
93
94static struct workqueue_struct *acpi_thermal_pm_queue;
95
96static int acpi_thermal_add(struct acpi_device *device);
97static int acpi_thermal_remove(struct acpi_device *device);
98static void acpi_thermal_notify(struct acpi_device *device, u32 event);
99
100static const struct acpi_device_id thermal_device_ids[] = {
101 {ACPI_THERMAL_HID, 0},
102 {"", 0},
103};
104MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
105
106#ifdef CONFIG_PM_SLEEP
107static int acpi_thermal_suspend(struct device *dev);
108static int acpi_thermal_resume(struct device *dev);
109#else
110#define acpi_thermal_suspend NULL
111#define acpi_thermal_resume NULL
112#endif
113static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
114
115static 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
127struct 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
136struct acpi_thermal_state_flags {
137 u8 valid:1;
138 u8 enabled:1;
139 u8 reserved:6;
140};
141
142struct acpi_thermal_critical {
143 struct acpi_thermal_state_flags flags;
144 unsigned long temperature;
145};
146
147struct acpi_thermal_hot {
148 struct acpi_thermal_state_flags flags;
149 unsigned long temperature;
150};
151
152struct 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
161struct acpi_thermal_active {
162 struct acpi_thermal_state_flags flags;
163 unsigned long temperature;
164 struct acpi_handle_list devices;
165};
166
167struct 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
174struct acpi_thermal_flags {
175 u8 cooling_mode:1; /* _SCP */
176 u8 devices:1; /* _TZD */
177 u8 reserved:6;
178};
179
180struct 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
201static 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
222static 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
241static 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) \
278do { \
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
285static 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', ('0' + 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
499static 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
520static 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
533static 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
550static 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
564static 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
594static 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
639static 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
692static 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
705static 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
749static 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
771static 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
854failed:
855 return result;
856}
857
858static int
859acpi_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
865static int
866acpi_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
872static 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
885static 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_attach_data(tz->device->handle,
929 acpi_bus_private_data_handler,
930 tz->thermal_zone);
931 if (ACPI_FAILURE(status)) {
932 pr_err(PREFIX "Error attaching device data\n");
933 return -ENODEV;
934 }
935
936 tz->tz_enabled = 1;
937
938 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
939 tz->thermal_zone->id);
940 return 0;
941}
942
943static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
944{
945 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
946 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
947 thermal_zone_device_unregister(tz->thermal_zone);
948 tz->thermal_zone = NULL;
949 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
950}
951
952
953/* --------------------------------------------------------------------------
954 Driver Interface
955 -------------------------------------------------------------------------- */
956
957static void acpi_thermal_notify(struct acpi_device *device, u32 event)
958{
959 struct acpi_thermal *tz = acpi_driver_data(device);
960
961
962 if (!tz)
963 return;
964
965 switch (event) {
966 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
967 acpi_thermal_check(tz);
968 break;
969 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
970 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
971 acpi_thermal_check(tz);
972 acpi_bus_generate_netlink_event(device->pnp.device_class,
973 dev_name(&device->dev), event, 0);
974 break;
975 case ACPI_THERMAL_NOTIFY_DEVICES:
976 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
977 acpi_thermal_check(tz);
978 acpi_bus_generate_netlink_event(device->pnp.device_class,
979 dev_name(&device->dev), event, 0);
980 break;
981 default:
982 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
983 "Unsupported event [0x%x]\n", event));
984 break;
985 }
986}
987
988/*
989 * On some platforms, the AML code has dependency about
990 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
991 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
992 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
993 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
994 * if _TMP has never been evaluated.
995 *
996 * As this dependency is totally transparent to OS, evaluate
997 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
998 * _TMP, before they are actually used.
999 */
1000static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
1001{
1002 acpi_handle handle = tz->device->handle;
1003 unsigned long long value;
1004 int i;
1005
1006 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1007 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1008 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1009 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1010 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1011 acpi_status status;
1012
1013 status = acpi_evaluate_integer(handle, name, NULL, &value);
1014 if (status == AE_NOT_FOUND)
1015 break;
1016 }
1017 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1018}
1019
1020static int acpi_thermal_get_info(struct acpi_thermal *tz)
1021{
1022 int result = 0;
1023
1024
1025 if (!tz)
1026 return -EINVAL;
1027
1028 acpi_thermal_aml_dependency_fix(tz);
1029
1030 /* Get trip points [_CRT, _PSV, etc.] (required) */
1031 result = acpi_thermal_get_trip_points(tz);
1032 if (result)
1033 return result;
1034
1035 /* Get temperature [_TMP] (required) */
1036 result = acpi_thermal_get_temperature(tz);
1037 if (result)
1038 return result;
1039
1040 /* Set the cooling mode [_SCP] to active cooling (default) */
1041 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1042 if (!result)
1043 tz->flags.cooling_mode = 1;
1044
1045 /* Get default polling frequency [_TZP] (optional) */
1046 if (tzp)
1047 tz->polling_frequency = tzp;
1048 else
1049 acpi_thermal_get_polling_frequency(tz);
1050
1051 return 0;
1052}
1053
1054/*
1055 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1056 * handles temperature values with a single decimal place. As a consequence,
1057 * some implementations use an offset of 273.1 and others use an offset of
1058 * 273.2. Try to find out which one is being used, to present the most
1059 * accurate and visually appealing number.
1060 *
1061 * The heuristic below should work for all ACPI thermal zones which have a
1062 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1063 */
1064static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1065{
1066 if (tz->trips.critical.flags.valid &&
1067 (tz->trips.critical.temperature % 5) == 1)
1068 tz->kelvin_offset = 2731;
1069 else
1070 tz->kelvin_offset = 2732;
1071}
1072
1073static void acpi_thermal_check_fn(struct work_struct *work)
1074{
1075 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1076 thermal_check_work);
1077 acpi_thermal_check(tz);
1078}
1079
1080static int acpi_thermal_add(struct acpi_device *device)
1081{
1082 int result = 0;
1083 struct acpi_thermal *tz = NULL;
1084
1085
1086 if (!device)
1087 return -EINVAL;
1088
1089 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1090 if (!tz)
1091 return -ENOMEM;
1092
1093 tz->device = device;
1094 strcpy(tz->name, device->pnp.bus_id);
1095 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1096 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1097 device->driver_data = tz;
1098
1099 result = acpi_thermal_get_info(tz);
1100 if (result)
1101 goto free_memory;
1102
1103 acpi_thermal_guess_offset(tz);
1104
1105 result = acpi_thermal_register_thermal_zone(tz);
1106 if (result)
1107 goto free_memory;
1108
1109 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1110
1111 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1112 acpi_device_bid(device), KELVIN_TO_CELSIUS(tz->temperature));
1113 goto end;
1114
1115free_memory:
1116 kfree(tz);
1117end:
1118 return result;
1119}
1120
1121static int acpi_thermal_remove(struct acpi_device *device)
1122{
1123 struct acpi_thermal *tz = NULL;
1124
1125 if (!device || !acpi_driver_data(device))
1126 return -EINVAL;
1127
1128 flush_workqueue(acpi_thermal_pm_queue);
1129 tz = acpi_driver_data(device);
1130
1131 acpi_thermal_unregister_thermal_zone(tz);
1132 kfree(tz);
1133 return 0;
1134}
1135
1136#ifdef CONFIG_PM_SLEEP
1137static int acpi_thermal_suspend(struct device *dev)
1138{
1139 /* Make sure the previously queued thermal check work has been done */
1140 flush_workqueue(acpi_thermal_pm_queue);
1141 return 0;
1142}
1143
1144static int acpi_thermal_resume(struct device *dev)
1145{
1146 struct acpi_thermal *tz;
1147 int i, j, power_state, result;
1148
1149 if (!dev)
1150 return -EINVAL;
1151
1152 tz = acpi_driver_data(to_acpi_device(dev));
1153 if (!tz)
1154 return -EINVAL;
1155
1156 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1157 if (!(&tz->trips.active[i]))
1158 break;
1159 if (!tz->trips.active[i].flags.valid)
1160 break;
1161 tz->trips.active[i].flags.enabled = 1;
1162 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1163 result = acpi_bus_update_power(
1164 tz->trips.active[i].devices.handles[j],
1165 &power_state);
1166 if (result || (power_state != ACPI_STATE_D0)) {
1167 tz->trips.active[i].flags.enabled = 0;
1168 break;
1169 }
1170 }
1171 tz->state.active |= tz->trips.active[i].flags.enabled;
1172 }
1173
1174 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1175
1176 return AE_OK;
1177}
1178#endif
1179
1180static int thermal_act(const struct dmi_system_id *d) {
1181
1182 if (act == 0) {
1183 pr_notice(PREFIX "%s detected: "
1184 "disabling all active thermal trip points\n", d->ident);
1185 act = -1;
1186 }
1187 return 0;
1188}
1189static int thermal_nocrt(const struct dmi_system_id *d) {
1190
1191 pr_notice(PREFIX "%s detected: "
1192 "disabling all critical thermal trip point actions.\n", d->ident);
1193 nocrt = 1;
1194 return 0;
1195}
1196static int thermal_tzp(const struct dmi_system_id *d) {
1197
1198 if (tzp == 0) {
1199 pr_notice(PREFIX "%s detected: "
1200 "enabling thermal zone polling\n", d->ident);
1201 tzp = 300; /* 300 dS = 30 Seconds */
1202 }
1203 return 0;
1204}
1205static int thermal_psv(const struct dmi_system_id *d) {
1206
1207 if (psv == 0) {
1208 pr_notice(PREFIX "%s detected: "
1209 "disabling all passive thermal trip points\n", d->ident);
1210 psv = -1;
1211 }
1212 return 0;
1213}
1214
1215static struct dmi_system_id thermal_dmi_table[] __initdata = {
1216 /*
1217 * Award BIOS on this AOpen makes thermal control almost worthless.
1218 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1219 */
1220 {
1221 .callback = thermal_act,
1222 .ident = "AOpen i915GMm-HFS",
1223 .matches = {
1224 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1225 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1226 },
1227 },
1228 {
1229 .callback = thermal_psv,
1230 .ident = "AOpen i915GMm-HFS",
1231 .matches = {
1232 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1233 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1234 },
1235 },
1236 {
1237 .callback = thermal_tzp,
1238 .ident = "AOpen i915GMm-HFS",
1239 .matches = {
1240 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1241 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1242 },
1243 },
1244 {
1245 .callback = thermal_nocrt,
1246 .ident = "Gigabyte GA-7ZX",
1247 .matches = {
1248 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1249 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1250 },
1251 },
1252 {}
1253};
1254
1255static int __init acpi_thermal_init(void)
1256{
1257 int result = 0;
1258
1259 dmi_check_system(thermal_dmi_table);
1260
1261 if (off) {
1262 pr_notice(PREFIX "thermal control disabled\n");
1263 return -ENODEV;
1264 }
1265
1266 acpi_thermal_pm_queue = create_workqueue("acpi_thermal_pm");
1267 if (!acpi_thermal_pm_queue)
1268 return -ENODEV;
1269
1270 result = acpi_bus_register_driver(&acpi_thermal_driver);
1271 if (result < 0) {
1272 destroy_workqueue(acpi_thermal_pm_queue);
1273 return -ENODEV;
1274 }
1275
1276 return 0;
1277}
1278
1279static void __exit acpi_thermal_exit(void)
1280{
1281 acpi_bus_unregister_driver(&acpi_thermal_driver);
1282 destroy_workqueue(acpi_thermal_pm_queue);
1283
1284 return;
1285}
1286
1287module_init(acpi_thermal_init);
1288module_exit(acpi_thermal_exit);