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1/*
2 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 *
25 * This driver fully implements the ACPI thermal policy as described in the
26 * ACPI 2.0 Specification.
27 *
28 * TBD: 1. Implement passive cooling hysteresis.
29 * 2. Enhance passive cooling (CPU) states/limit interface to support
30 * concepts of 'multiple limiters', upper/lower limits, etc.
31 *
32 */
33
34#include <linux/kernel.h>
35#include <linux/module.h>
36#include <linux/dmi.h>
37#include <linux/init.h>
38#include <linux/slab.h>
39#include <linux/types.h>
40#include <linux/jiffies.h>
41#include <linux/kmod.h>
42#include <linux/reboot.h>
43#include <linux/device.h>
44#include <asm/uaccess.h>
45#include <linux/thermal.h>
46#include <acpi/acpi_bus.h>
47#include <acpi/acpi_drivers.h>
48
49#define PREFIX "ACPI: "
50
51#define ACPI_THERMAL_CLASS "thermal_zone"
52#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
53#define ACPI_THERMAL_FILE_STATE "state"
54#define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
55#define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
56#define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
57#define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
58#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
59#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
60#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
61#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
62#define ACPI_THERMAL_NOTIFY_HOT 0xF1
63#define ACPI_THERMAL_MODE_ACTIVE 0x00
64
65#define ACPI_THERMAL_MAX_ACTIVE 10
66#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
67
68#define _COMPONENT ACPI_THERMAL_COMPONENT
69ACPI_MODULE_NAME("thermal");
70
71MODULE_AUTHOR("Paul Diefenbaugh");
72MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
73MODULE_LICENSE("GPL");
74
75static int act;
76module_param(act, int, 0644);
77MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
78
79static int crt;
80module_param(crt, int, 0644);
81MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
82
83static int tzp;
84module_param(tzp, int, 0444);
85MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
86
87static int nocrt;
88module_param(nocrt, int, 0);
89MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
90
91static int off;
92module_param(off, int, 0);
93MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
94
95static int psv;
96module_param(psv, int, 0644);
97MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
98
99static int acpi_thermal_add(struct acpi_device *device);
100static int acpi_thermal_remove(struct acpi_device *device, int type);
101static int acpi_thermal_resume(struct acpi_device *device);
102static void acpi_thermal_notify(struct acpi_device *device, u32 event);
103
104static const struct acpi_device_id thermal_device_ids[] = {
105 {ACPI_THERMAL_HID, 0},
106 {"", 0},
107};
108MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
109
110static struct acpi_driver acpi_thermal_driver = {
111 .name = "thermal",
112 .class = ACPI_THERMAL_CLASS,
113 .ids = thermal_device_ids,
114 .ops = {
115 .add = acpi_thermal_add,
116 .remove = acpi_thermal_remove,
117 .resume = acpi_thermal_resume,
118 .notify = acpi_thermal_notify,
119 },
120};
121
122struct acpi_thermal_state {
123 u8 critical:1;
124 u8 hot:1;
125 u8 passive:1;
126 u8 active:1;
127 u8 reserved:4;
128 int active_index;
129};
130
131struct acpi_thermal_state_flags {
132 u8 valid:1;
133 u8 enabled:1;
134 u8 reserved:6;
135};
136
137struct acpi_thermal_critical {
138 struct acpi_thermal_state_flags flags;
139 unsigned long temperature;
140};
141
142struct acpi_thermal_hot {
143 struct acpi_thermal_state_flags flags;
144 unsigned long temperature;
145};
146
147struct acpi_thermal_passive {
148 struct acpi_thermal_state_flags flags;
149 unsigned long temperature;
150 unsigned long tc1;
151 unsigned long tc2;
152 unsigned long tsp;
153 struct acpi_handle_list devices;
154};
155
156struct acpi_thermal_active {
157 struct acpi_thermal_state_flags flags;
158 unsigned long temperature;
159 struct acpi_handle_list devices;
160};
161
162struct acpi_thermal_trips {
163 struct acpi_thermal_critical critical;
164 struct acpi_thermal_hot hot;
165 struct acpi_thermal_passive passive;
166 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
167};
168
169struct acpi_thermal_flags {
170 u8 cooling_mode:1; /* _SCP */
171 u8 devices:1; /* _TZD */
172 u8 reserved:6;
173};
174
175struct acpi_thermal {
176 struct acpi_device * device;
177 acpi_bus_id name;
178 unsigned long temperature;
179 unsigned long last_temperature;
180 unsigned long polling_frequency;
181 volatile u8 zombie;
182 struct acpi_thermal_flags flags;
183 struct acpi_thermal_state state;
184 struct acpi_thermal_trips trips;
185 struct acpi_handle_list devices;
186 struct thermal_zone_device *thermal_zone;
187 int tz_enabled;
188 int kelvin_offset;
189 struct mutex lock;
190};
191
192/* --------------------------------------------------------------------------
193 Thermal Zone Management
194 -------------------------------------------------------------------------- */
195
196static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
197{
198 acpi_status status = AE_OK;
199 unsigned long long tmp;
200
201 if (!tz)
202 return -EINVAL;
203
204 tz->last_temperature = tz->temperature;
205
206 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
207 if (ACPI_FAILURE(status))
208 return -ENODEV;
209
210 tz->temperature = tmp;
211 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
212 tz->temperature));
213
214 return 0;
215}
216
217static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
218{
219 acpi_status status = AE_OK;
220 unsigned long long tmp;
221
222 if (!tz)
223 return -EINVAL;
224
225 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
226 if (ACPI_FAILURE(status))
227 return -ENODEV;
228
229 tz->polling_frequency = tmp;
230 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
231 tz->polling_frequency));
232
233 return 0;
234}
235
236static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
237{
238 acpi_status status = AE_OK;
239 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
240 struct acpi_object_list arg_list = { 1, &arg0 };
241 acpi_handle handle = NULL;
242
243
244 if (!tz)
245 return -EINVAL;
246
247 status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
248 if (ACPI_FAILURE(status)) {
249 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
250 return -ENODEV;
251 }
252
253 arg0.integer.value = mode;
254
255 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
256 if (ACPI_FAILURE(status))
257 return -ENODEV;
258
259 return 0;
260}
261
262#define ACPI_TRIPS_CRITICAL 0x01
263#define ACPI_TRIPS_HOT 0x02
264#define ACPI_TRIPS_PASSIVE 0x04
265#define ACPI_TRIPS_ACTIVE 0x08
266#define ACPI_TRIPS_DEVICES 0x10
267
268#define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
269#define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
270
271#define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
272 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
273 ACPI_TRIPS_DEVICES)
274
275/*
276 * This exception is thrown out in two cases:
277 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
278 * when re-evaluating the AML code.
279 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
280 * We need to re-bind the cooling devices of a thermal zone when this occurs.
281 */
282#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
283do { \
284 if (flags != ACPI_TRIPS_INIT) \
285 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
286 "ACPI thermal trip point %s changed\n" \
287 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
288} while (0)
289
290static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
291{
292 acpi_status status = AE_OK;
293 unsigned long long tmp;
294 struct acpi_handle_list devices;
295 int valid = 0;
296 int i;
297
298 /* Critical Shutdown */
299 if (flag & ACPI_TRIPS_CRITICAL) {
300 status = acpi_evaluate_integer(tz->device->handle,
301 "_CRT", NULL, &tmp);
302 tz->trips.critical.temperature = tmp;
303 /*
304 * Treat freezing temperatures as invalid as well; some
305 * BIOSes return really low values and cause reboots at startup.
306 * Below zero (Celsius) values clearly aren't right for sure..
307 * ... so lets discard those as invalid.
308 */
309 if (ACPI_FAILURE(status)) {
310 tz->trips.critical.flags.valid = 0;
311 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
312 "No critical threshold\n"));
313 } else if (tmp <= 2732) {
314 printk(KERN_WARNING FW_BUG "Invalid critical threshold "
315 "(%llu)\n", tmp);
316 tz->trips.critical.flags.valid = 0;
317 } else {
318 tz->trips.critical.flags.valid = 1;
319 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
320 "Found critical threshold [%lu]\n",
321 tz->trips.critical.temperature));
322 }
323 if (tz->trips.critical.flags.valid == 1) {
324 if (crt == -1) {
325 tz->trips.critical.flags.valid = 0;
326 } else if (crt > 0) {
327 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
328 /*
329 * Allow override critical threshold
330 */
331 if (crt_k > tz->trips.critical.temperature)
332 printk(KERN_WARNING PREFIX
333 "Critical threshold %d C\n", crt);
334 tz->trips.critical.temperature = crt_k;
335 }
336 }
337 }
338
339 /* Critical Sleep (optional) */
340 if (flag & ACPI_TRIPS_HOT) {
341 status = acpi_evaluate_integer(tz->device->handle,
342 "_HOT", NULL, &tmp);
343 if (ACPI_FAILURE(status)) {
344 tz->trips.hot.flags.valid = 0;
345 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
346 "No hot threshold\n"));
347 } else {
348 tz->trips.hot.temperature = tmp;
349 tz->trips.hot.flags.valid = 1;
350 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
351 "Found hot threshold [%lu]\n",
352 tz->trips.critical.temperature));
353 }
354 }
355
356 /* Passive (optional) */
357 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
358 (flag == ACPI_TRIPS_INIT)) {
359 valid = tz->trips.passive.flags.valid;
360 if (psv == -1) {
361 status = AE_SUPPORT;
362 } else if (psv > 0) {
363 tmp = CELSIUS_TO_KELVIN(psv);
364 status = AE_OK;
365 } else {
366 status = acpi_evaluate_integer(tz->device->handle,
367 "_PSV", NULL, &tmp);
368 }
369
370 if (ACPI_FAILURE(status))
371 tz->trips.passive.flags.valid = 0;
372 else {
373 tz->trips.passive.temperature = tmp;
374 tz->trips.passive.flags.valid = 1;
375 if (flag == ACPI_TRIPS_INIT) {
376 status = acpi_evaluate_integer(
377 tz->device->handle, "_TC1",
378 NULL, &tmp);
379 if (ACPI_FAILURE(status))
380 tz->trips.passive.flags.valid = 0;
381 else
382 tz->trips.passive.tc1 = tmp;
383 status = acpi_evaluate_integer(
384 tz->device->handle, "_TC2",
385 NULL, &tmp);
386 if (ACPI_FAILURE(status))
387 tz->trips.passive.flags.valid = 0;
388 else
389 tz->trips.passive.tc2 = tmp;
390 status = acpi_evaluate_integer(
391 tz->device->handle, "_TSP",
392 NULL, &tmp);
393 if (ACPI_FAILURE(status))
394 tz->trips.passive.flags.valid = 0;
395 else
396 tz->trips.passive.tsp = tmp;
397 }
398 }
399 }
400 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
401 memset(&devices, 0, sizeof(struct acpi_handle_list));
402 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
403 NULL, &devices);
404 if (ACPI_FAILURE(status)) {
405 printk(KERN_WARNING PREFIX
406 "Invalid passive threshold\n");
407 tz->trips.passive.flags.valid = 0;
408 }
409 else
410 tz->trips.passive.flags.valid = 1;
411
412 if (memcmp(&tz->trips.passive.devices, &devices,
413 sizeof(struct acpi_handle_list))) {
414 memcpy(&tz->trips.passive.devices, &devices,
415 sizeof(struct acpi_handle_list));
416 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
417 }
418 }
419 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
420 if (valid != tz->trips.passive.flags.valid)
421 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
422 }
423
424 /* Active (optional) */
425 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
426 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
427 valid = tz->trips.active[i].flags.valid;
428
429 if (act == -1)
430 break; /* disable all active trip points */
431
432 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
433 tz->trips.active[i].flags.valid)) {
434 status = acpi_evaluate_integer(tz->device->handle,
435 name, NULL, &tmp);
436 if (ACPI_FAILURE(status)) {
437 tz->trips.active[i].flags.valid = 0;
438 if (i == 0)
439 break;
440 if (act <= 0)
441 break;
442 if (i == 1)
443 tz->trips.active[0].temperature =
444 CELSIUS_TO_KELVIN(act);
445 else
446 /*
447 * Don't allow override higher than
448 * the next higher trip point
449 */
450 tz->trips.active[i - 1].temperature =
451 (tz->trips.active[i - 2].temperature <
452 CELSIUS_TO_KELVIN(act) ?
453 tz->trips.active[i - 2].temperature :
454 CELSIUS_TO_KELVIN(act));
455 break;
456 } else {
457 tz->trips.active[i].temperature = tmp;
458 tz->trips.active[i].flags.valid = 1;
459 }
460 }
461
462 name[2] = 'L';
463 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
464 memset(&devices, 0, sizeof(struct acpi_handle_list));
465 status = acpi_evaluate_reference(tz->device->handle,
466 name, NULL, &devices);
467 if (ACPI_FAILURE(status)) {
468 printk(KERN_WARNING PREFIX
469 "Invalid active%d threshold\n", i);
470 tz->trips.active[i].flags.valid = 0;
471 }
472 else
473 tz->trips.active[i].flags.valid = 1;
474
475 if (memcmp(&tz->trips.active[i].devices, &devices,
476 sizeof(struct acpi_handle_list))) {
477 memcpy(&tz->trips.active[i].devices, &devices,
478 sizeof(struct acpi_handle_list));
479 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
480 }
481 }
482 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
483 if (valid != tz->trips.active[i].flags.valid)
484 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
485
486 if (!tz->trips.active[i].flags.valid)
487 break;
488 }
489
490 if (flag & ACPI_TRIPS_DEVICES) {
491 memset(&devices, 0, sizeof(struct acpi_handle_list));
492 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
493 NULL, &devices);
494 if (memcmp(&tz->devices, &devices,
495 sizeof(struct acpi_handle_list))) {
496 memcpy(&tz->devices, &devices,
497 sizeof(struct acpi_handle_list));
498 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
499 }
500 }
501
502 return 0;
503}
504
505static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
506{
507 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
508
509 if (ret)
510 return ret;
511
512 valid = tz->trips.critical.flags.valid |
513 tz->trips.hot.flags.valid |
514 tz->trips.passive.flags.valid;
515
516 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
517 valid |= tz->trips.active[i].flags.valid;
518
519 if (!valid) {
520 printk(KERN_WARNING FW_BUG "No valid trip found\n");
521 return -ENODEV;
522 }
523 return 0;
524}
525
526static void acpi_thermal_check(void *data)
527{
528 struct acpi_thermal *tz = data;
529
530 thermal_zone_device_update(tz->thermal_zone);
531}
532
533/* sys I/F for generic thermal sysfs support */
534#define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
535
536static int thermal_get_temp(struct thermal_zone_device *thermal,
537 unsigned long *temp)
538{
539 struct acpi_thermal *tz = thermal->devdata;
540 int result;
541
542 if (!tz)
543 return -EINVAL;
544
545 result = acpi_thermal_get_temperature(tz);
546 if (result)
547 return result;
548
549 *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
550 return 0;
551}
552
553static const char enabled[] = "kernel";
554static const char disabled[] = "user";
555static int thermal_get_mode(struct thermal_zone_device *thermal,
556 enum thermal_device_mode *mode)
557{
558 struct acpi_thermal *tz = thermal->devdata;
559
560 if (!tz)
561 return -EINVAL;
562
563 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
564 THERMAL_DEVICE_DISABLED;
565
566 return 0;
567}
568
569static int thermal_set_mode(struct thermal_zone_device *thermal,
570 enum thermal_device_mode mode)
571{
572 struct acpi_thermal *tz = thermal->devdata;
573 int enable;
574
575 if (!tz)
576 return -EINVAL;
577
578 /*
579 * enable/disable thermal management from ACPI thermal driver
580 */
581 if (mode == THERMAL_DEVICE_ENABLED)
582 enable = 1;
583 else if (mode == THERMAL_DEVICE_DISABLED)
584 enable = 0;
585 else
586 return -EINVAL;
587
588 if (enable != tz->tz_enabled) {
589 tz->tz_enabled = enable;
590 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
591 "%s ACPI thermal control\n",
592 tz->tz_enabled ? enabled : disabled));
593 acpi_thermal_check(tz);
594 }
595 return 0;
596}
597
598static int thermal_get_trip_type(struct thermal_zone_device *thermal,
599 int trip, enum thermal_trip_type *type)
600{
601 struct acpi_thermal *tz = thermal->devdata;
602 int i;
603
604 if (!tz || trip < 0)
605 return -EINVAL;
606
607 if (tz->trips.critical.flags.valid) {
608 if (!trip) {
609 *type = THERMAL_TRIP_CRITICAL;
610 return 0;
611 }
612 trip--;
613 }
614
615 if (tz->trips.hot.flags.valid) {
616 if (!trip) {
617 *type = THERMAL_TRIP_HOT;
618 return 0;
619 }
620 trip--;
621 }
622
623 if (tz->trips.passive.flags.valid) {
624 if (!trip) {
625 *type = THERMAL_TRIP_PASSIVE;
626 return 0;
627 }
628 trip--;
629 }
630
631 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
632 tz->trips.active[i].flags.valid; i++) {
633 if (!trip) {
634 *type = THERMAL_TRIP_ACTIVE;
635 return 0;
636 }
637 trip--;
638 }
639
640 return -EINVAL;
641}
642
643static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
644 int trip, unsigned long *temp)
645{
646 struct acpi_thermal *tz = thermal->devdata;
647 int i;
648
649 if (!tz || trip < 0)
650 return -EINVAL;
651
652 if (tz->trips.critical.flags.valid) {
653 if (!trip) {
654 *temp = KELVIN_TO_MILLICELSIUS(
655 tz->trips.critical.temperature,
656 tz->kelvin_offset);
657 return 0;
658 }
659 trip--;
660 }
661
662 if (tz->trips.hot.flags.valid) {
663 if (!trip) {
664 *temp = KELVIN_TO_MILLICELSIUS(
665 tz->trips.hot.temperature,
666 tz->kelvin_offset);
667 return 0;
668 }
669 trip--;
670 }
671
672 if (tz->trips.passive.flags.valid) {
673 if (!trip) {
674 *temp = KELVIN_TO_MILLICELSIUS(
675 tz->trips.passive.temperature,
676 tz->kelvin_offset);
677 return 0;
678 }
679 trip--;
680 }
681
682 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
683 tz->trips.active[i].flags.valid; i++) {
684 if (!trip) {
685 *temp = KELVIN_TO_MILLICELSIUS(
686 tz->trips.active[i].temperature,
687 tz->kelvin_offset);
688 return 0;
689 }
690 trip--;
691 }
692
693 return -EINVAL;
694}
695
696static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
697 unsigned long *temperature) {
698 struct acpi_thermal *tz = thermal->devdata;
699
700 if (tz->trips.critical.flags.valid) {
701 *temperature = KELVIN_TO_MILLICELSIUS(
702 tz->trips.critical.temperature,
703 tz->kelvin_offset);
704 return 0;
705 } else
706 return -EINVAL;
707}
708
709static int thermal_notify(struct thermal_zone_device *thermal, int trip,
710 enum thermal_trip_type trip_type)
711{
712 u8 type = 0;
713 struct acpi_thermal *tz = thermal->devdata;
714
715 if (trip_type == THERMAL_TRIP_CRITICAL)
716 type = ACPI_THERMAL_NOTIFY_CRITICAL;
717 else if (trip_type == THERMAL_TRIP_HOT)
718 type = ACPI_THERMAL_NOTIFY_HOT;
719 else
720 return 0;
721
722 acpi_bus_generate_proc_event(tz->device, type, 1);
723 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
724 dev_name(&tz->device->dev), type, 1);
725
726 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
727 return 1;
728
729 return 0;
730}
731
732typedef int (*cb)(struct thermal_zone_device *, int,
733 struct thermal_cooling_device *);
734static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
735 struct thermal_cooling_device *cdev,
736 cb action)
737{
738 struct acpi_device *device = cdev->devdata;
739 struct acpi_thermal *tz = thermal->devdata;
740 struct acpi_device *dev;
741 acpi_status status;
742 acpi_handle handle;
743 int i;
744 int j;
745 int trip = -1;
746 int result = 0;
747
748 if (tz->trips.critical.flags.valid)
749 trip++;
750
751 if (tz->trips.hot.flags.valid)
752 trip++;
753
754 if (tz->trips.passive.flags.valid) {
755 trip++;
756 for (i = 0; i < tz->trips.passive.devices.count;
757 i++) {
758 handle = tz->trips.passive.devices.handles[i];
759 status = acpi_bus_get_device(handle, &dev);
760 if (ACPI_SUCCESS(status) && (dev == device)) {
761 result = action(thermal, trip, cdev);
762 if (result)
763 goto failed;
764 }
765 }
766 }
767
768 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
769 if (!tz->trips.active[i].flags.valid)
770 break;
771 trip++;
772 for (j = 0;
773 j < tz->trips.active[i].devices.count;
774 j++) {
775 handle = tz->trips.active[i].devices.handles[j];
776 status = acpi_bus_get_device(handle, &dev);
777 if (ACPI_SUCCESS(status) && (dev == device)) {
778 result = action(thermal, trip, cdev);
779 if (result)
780 goto failed;
781 }
782 }
783 }
784
785 for (i = 0; i < tz->devices.count; i++) {
786 handle = tz->devices.handles[i];
787 status = acpi_bus_get_device(handle, &dev);
788 if (ACPI_SUCCESS(status) && (dev == device)) {
789 result = action(thermal, -1, cdev);
790 if (result)
791 goto failed;
792 }
793 }
794
795failed:
796 return result;
797}
798
799static int
800acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
801 struct thermal_cooling_device *cdev)
802{
803 return acpi_thermal_cooling_device_cb(thermal, cdev,
804 thermal_zone_bind_cooling_device);
805}
806
807static int
808acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
809 struct thermal_cooling_device *cdev)
810{
811 return acpi_thermal_cooling_device_cb(thermal, cdev,
812 thermal_zone_unbind_cooling_device);
813}
814
815static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
816 .bind = acpi_thermal_bind_cooling_device,
817 .unbind = acpi_thermal_unbind_cooling_device,
818 .get_temp = thermal_get_temp,
819 .get_mode = thermal_get_mode,
820 .set_mode = thermal_set_mode,
821 .get_trip_type = thermal_get_trip_type,
822 .get_trip_temp = thermal_get_trip_temp,
823 .get_crit_temp = thermal_get_crit_temp,
824 .notify = thermal_notify,
825};
826
827static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
828{
829 int trips = 0;
830 int result;
831 acpi_status status;
832 int i;
833
834 if (tz->trips.critical.flags.valid)
835 trips++;
836
837 if (tz->trips.hot.flags.valid)
838 trips++;
839
840 if (tz->trips.passive.flags.valid)
841 trips++;
842
843 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
844 tz->trips.active[i].flags.valid; i++, trips++);
845
846 if (tz->trips.passive.flags.valid)
847 tz->thermal_zone =
848 thermal_zone_device_register("acpitz", trips, tz,
849 &acpi_thermal_zone_ops,
850 tz->trips.passive.tc1,
851 tz->trips.passive.tc2,
852 tz->trips.passive.tsp*100,
853 tz->polling_frequency*100);
854 else
855 tz->thermal_zone =
856 thermal_zone_device_register("acpitz", trips, tz,
857 &acpi_thermal_zone_ops,
858 0, 0, 0,
859 tz->polling_frequency*100);
860 if (IS_ERR(tz->thermal_zone))
861 return -ENODEV;
862
863 result = sysfs_create_link(&tz->device->dev.kobj,
864 &tz->thermal_zone->device.kobj, "thermal_zone");
865 if (result)
866 return result;
867
868 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
869 &tz->device->dev.kobj, "device");
870 if (result)
871 return result;
872
873 status = acpi_attach_data(tz->device->handle,
874 acpi_bus_private_data_handler,
875 tz->thermal_zone);
876 if (ACPI_FAILURE(status)) {
877 printk(KERN_ERR PREFIX
878 "Error attaching device data\n");
879 return -ENODEV;
880 }
881
882 tz->tz_enabled = 1;
883
884 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
885 tz->thermal_zone->id);
886 return 0;
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_detach_data(tz->device->handle, acpi_bus_private_data_handler);
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_proc_event(device, event, 0);
919 acpi_bus_generate_netlink_event(device->pnp.device_class,
920 dev_name(&device->dev), event, 0);
921 break;
922 case ACPI_THERMAL_NOTIFY_DEVICES:
923 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
924 acpi_thermal_check(tz);
925 acpi_bus_generate_proc_event(device, event, 0);
926 acpi_bus_generate_netlink_event(device->pnp.device_class,
927 dev_name(&device->dev), event, 0);
928 break;
929 default:
930 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
931 "Unsupported event [0x%x]\n", event));
932 break;
933 }
934}
935
936static int acpi_thermal_get_info(struct acpi_thermal *tz)
937{
938 int result = 0;
939
940
941 if (!tz)
942 return -EINVAL;
943
944 /* Get temperature [_TMP] (required) */
945 result = acpi_thermal_get_temperature(tz);
946 if (result)
947 return result;
948
949 /* Get trip points [_CRT, _PSV, etc.] (required) */
950 result = acpi_thermal_get_trip_points(tz);
951 if (result)
952 return result;
953
954 /* Set the cooling mode [_SCP] to active cooling (default) */
955 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
956 if (!result)
957 tz->flags.cooling_mode = 1;
958
959 /* Get default polling frequency [_TZP] (optional) */
960 if (tzp)
961 tz->polling_frequency = tzp;
962 else
963 acpi_thermal_get_polling_frequency(tz);
964
965 return 0;
966}
967
968/*
969 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
970 * handles temperature values with a single decimal place. As a consequence,
971 * some implementations use an offset of 273.1 and others use an offset of
972 * 273.2. Try to find out which one is being used, to present the most
973 * accurate and visually appealing number.
974 *
975 * The heuristic below should work for all ACPI thermal zones which have a
976 * critical trip point with a value being a multiple of 0.5 degree Celsius.
977 */
978static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
979{
980 if (tz->trips.critical.flags.valid &&
981 (tz->trips.critical.temperature % 5) == 1)
982 tz->kelvin_offset = 2731;
983 else
984 tz->kelvin_offset = 2732;
985}
986
987static int acpi_thermal_add(struct acpi_device *device)
988{
989 int result = 0;
990 struct acpi_thermal *tz = NULL;
991
992
993 if (!device)
994 return -EINVAL;
995
996 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
997 if (!tz)
998 return -ENOMEM;
999
1000 tz->device = device;
1001 strcpy(tz->name, device->pnp.bus_id);
1002 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1003 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1004 device->driver_data = tz;
1005 mutex_init(&tz->lock);
1006
1007
1008 result = acpi_thermal_get_info(tz);
1009 if (result)
1010 goto free_memory;
1011
1012 acpi_thermal_guess_offset(tz);
1013
1014 result = acpi_thermal_register_thermal_zone(tz);
1015 if (result)
1016 goto free_memory;
1017
1018 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1019 acpi_device_name(device), acpi_device_bid(device),
1020 KELVIN_TO_CELSIUS(tz->temperature));
1021 goto end;
1022
1023free_memory:
1024 kfree(tz);
1025end:
1026 return result;
1027}
1028
1029static int acpi_thermal_remove(struct acpi_device *device, int type)
1030{
1031 struct acpi_thermal *tz = NULL;
1032
1033 if (!device || !acpi_driver_data(device))
1034 return -EINVAL;
1035
1036 tz = acpi_driver_data(device);
1037
1038 acpi_thermal_unregister_thermal_zone(tz);
1039 mutex_destroy(&tz->lock);
1040 kfree(tz);
1041 return 0;
1042}
1043
1044static int acpi_thermal_resume(struct acpi_device *device)
1045{
1046 struct acpi_thermal *tz = NULL;
1047 int i, j, power_state, result;
1048
1049
1050 if (!device || !acpi_driver_data(device))
1051 return -EINVAL;
1052
1053 tz = acpi_driver_data(device);
1054
1055 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1056 if (!(&tz->trips.active[i]))
1057 break;
1058 if (!tz->trips.active[i].flags.valid)
1059 break;
1060 tz->trips.active[i].flags.enabled = 1;
1061 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1062 result = acpi_bus_update_power(
1063 tz->trips.active[i].devices.handles[j],
1064 &power_state);
1065 if (result || (power_state != ACPI_STATE_D0)) {
1066 tz->trips.active[i].flags.enabled = 0;
1067 break;
1068 }
1069 }
1070 tz->state.active |= tz->trips.active[i].flags.enabled;
1071 }
1072
1073 acpi_thermal_check(tz);
1074
1075 return AE_OK;
1076}
1077
1078static int thermal_act(const struct dmi_system_id *d) {
1079
1080 if (act == 0) {
1081 printk(KERN_NOTICE "ACPI: %s detected: "
1082 "disabling all active thermal trip points\n", d->ident);
1083 act = -1;
1084 }
1085 return 0;
1086}
1087static int thermal_nocrt(const struct dmi_system_id *d) {
1088
1089 printk(KERN_NOTICE "ACPI: %s detected: "
1090 "disabling all critical thermal trip point actions.\n", d->ident);
1091 nocrt = 1;
1092 return 0;
1093}
1094static int thermal_tzp(const struct dmi_system_id *d) {
1095
1096 if (tzp == 0) {
1097 printk(KERN_NOTICE "ACPI: %s detected: "
1098 "enabling thermal zone polling\n", d->ident);
1099 tzp = 300; /* 300 dS = 30 Seconds */
1100 }
1101 return 0;
1102}
1103static int thermal_psv(const struct dmi_system_id *d) {
1104
1105 if (psv == 0) {
1106 printk(KERN_NOTICE "ACPI: %s detected: "
1107 "disabling all passive thermal trip points\n", d->ident);
1108 psv = -1;
1109 }
1110 return 0;
1111}
1112
1113static struct dmi_system_id thermal_dmi_table[] __initdata = {
1114 /*
1115 * Award BIOS on this AOpen makes thermal control almost worthless.
1116 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1117 */
1118 {
1119 .callback = thermal_act,
1120 .ident = "AOpen i915GMm-HFS",
1121 .matches = {
1122 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1123 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1124 },
1125 },
1126 {
1127 .callback = thermal_psv,
1128 .ident = "AOpen i915GMm-HFS",
1129 .matches = {
1130 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1131 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1132 },
1133 },
1134 {
1135 .callback = thermal_tzp,
1136 .ident = "AOpen i915GMm-HFS",
1137 .matches = {
1138 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1139 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1140 },
1141 },
1142 {
1143 .callback = thermal_nocrt,
1144 .ident = "Gigabyte GA-7ZX",
1145 .matches = {
1146 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1147 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1148 },
1149 },
1150 {}
1151};
1152
1153static int __init acpi_thermal_init(void)
1154{
1155 int result = 0;
1156
1157 dmi_check_system(thermal_dmi_table);
1158
1159 if (off) {
1160 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1161 return -ENODEV;
1162 }
1163
1164 result = acpi_bus_register_driver(&acpi_thermal_driver);
1165 if (result < 0)
1166 return -ENODEV;
1167
1168 return 0;
1169}
1170
1171static void __exit acpi_thermal_exit(void)
1172{
1173
1174 acpi_bus_unregister_driver(&acpi_thermal_driver);
1175
1176 return;
1177}
1178
1179module_init(acpi_thermal_init);
1180module_exit(acpi_thermal_exit);
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#define pr_fmt(fmt) "ACPI: thermal: " fmt
17
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/dmi.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <linux/types.h>
24#include <linux/jiffies.h>
25#include <linux/kmod.h>
26#include <linux/reboot.h>
27#include <linux/device.h>
28#include <linux/thermal.h>
29#include <linux/acpi.h>
30#include <linux/workqueue.h>
31#include <linux/uaccess.h>
32#include <linux/units.h>
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
46MODULE_AUTHOR("Paul Diefenbaugh");
47MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
48MODULE_LICENSE("GPL");
49
50static int act;
51module_param(act, int, 0644);
52MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
53
54static int crt;
55module_param(crt, int, 0644);
56MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
57
58static int tzp;
59module_param(tzp, int, 0444);
60MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
61
62static int nocrt;
63module_param(nocrt, int, 0);
64MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
65
66static int off;
67module_param(off, int, 0);
68MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
69
70static int psv;
71module_param(psv, int, 0644);
72MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
73
74static struct workqueue_struct *acpi_thermal_pm_queue;
75
76static int acpi_thermal_add(struct acpi_device *device);
77static void acpi_thermal_remove(struct acpi_device *device);
78static void acpi_thermal_notify(struct acpi_device *device, u32 event);
79
80static const struct acpi_device_id thermal_device_ids[] = {
81 {ACPI_THERMAL_HID, 0},
82 {"", 0},
83};
84MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
85
86#ifdef CONFIG_PM_SLEEP
87static int acpi_thermal_suspend(struct device *dev);
88static int acpi_thermal_resume(struct device *dev);
89#else
90#define acpi_thermal_suspend NULL
91#define acpi_thermal_resume NULL
92#endif
93static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
94
95static struct acpi_driver acpi_thermal_driver = {
96 .name = "thermal",
97 .class = ACPI_THERMAL_CLASS,
98 .ids = thermal_device_ids,
99 .ops = {
100 .add = acpi_thermal_add,
101 .remove = acpi_thermal_remove,
102 .notify = acpi_thermal_notify,
103 },
104 .drv.pm = &acpi_thermal_pm,
105};
106
107struct acpi_thermal_state {
108 u8 critical:1;
109 u8 hot:1;
110 u8 passive:1;
111 u8 active:1;
112 u8 reserved:4;
113 int active_index;
114};
115
116struct acpi_thermal_state_flags {
117 u8 valid:1;
118 u8 enabled:1;
119 u8 reserved:6;
120};
121
122struct acpi_thermal_critical {
123 struct acpi_thermal_state_flags flags;
124 unsigned long temperature;
125};
126
127struct acpi_thermal_hot {
128 struct acpi_thermal_state_flags flags;
129 unsigned long temperature;
130};
131
132struct acpi_thermal_passive {
133 struct acpi_thermal_state_flags flags;
134 unsigned long temperature;
135 unsigned long tc1;
136 unsigned long tc2;
137 unsigned long tsp;
138 struct acpi_handle_list devices;
139};
140
141struct acpi_thermal_active {
142 struct acpi_thermal_state_flags flags;
143 unsigned long temperature;
144 struct acpi_handle_list devices;
145};
146
147struct acpi_thermal_trips {
148 struct acpi_thermal_critical critical;
149 struct acpi_thermal_hot hot;
150 struct acpi_thermal_passive passive;
151 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
152};
153
154struct acpi_thermal_flags {
155 u8 cooling_mode:1; /* _SCP */
156 u8 devices:1; /* _TZD */
157 u8 reserved:6;
158};
159
160struct acpi_thermal {
161 struct acpi_device *device;
162 acpi_bus_id name;
163 unsigned long temperature;
164 unsigned long last_temperature;
165 unsigned long polling_frequency;
166 volatile u8 zombie;
167 struct acpi_thermal_flags flags;
168 struct acpi_thermal_state state;
169 struct acpi_thermal_trips trips;
170 struct acpi_handle_list devices;
171 struct thermal_zone_device *thermal_zone;
172 int kelvin_offset; /* in millidegrees */
173 struct work_struct thermal_check_work;
174 struct mutex thermal_check_lock;
175 refcount_t thermal_check_count;
176};
177
178/* --------------------------------------------------------------------------
179 Thermal Zone Management
180 -------------------------------------------------------------------------- */
181
182static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
183{
184 acpi_status status = AE_OK;
185 unsigned long long tmp;
186
187 if (!tz)
188 return -EINVAL;
189
190 tz->last_temperature = tz->temperature;
191
192 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
193 if (ACPI_FAILURE(status))
194 return -ENODEV;
195
196 tz->temperature = tmp;
197
198 acpi_handle_debug(tz->device->handle, "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_handle_debug(tz->device->handle, "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, tz, str) \
256do { \
257 if (flags != ACPI_TRIPS_INIT) \
258 acpi_handle_info(tz->device->handle, \
259 "ACPI thermal trip point %s changed\n" \
260 "Please report to linux-acpi@vger.kernel.org\n", str); \
261} while (0)
262
263static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
264{
265 acpi_status status;
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, "_CRT", NULL, &tmp);
274 tz->trips.critical.temperature = tmp;
275 /*
276 * Treat freezing temperatures as invalid as well; some
277 * BIOSes return really low values and cause reboots at startup.
278 * Below zero (Celsius) values clearly aren't right for sure..
279 * ... so lets discard those as invalid.
280 */
281 if (ACPI_FAILURE(status)) {
282 tz->trips.critical.flags.valid = 0;
283 acpi_handle_debug(tz->device->handle,
284 "No critical threshold\n");
285 } else if (tmp <= 2732) {
286 pr_info(FW_BUG "Invalid critical threshold (%llu)\n", tmp);
287 tz->trips.critical.flags.valid = 0;
288 } else {
289 tz->trips.critical.flags.valid = 1;
290 acpi_handle_debug(tz->device->handle,
291 "Found critical threshold [%lu]\n",
292 tz->trips.critical.temperature);
293 }
294 if (tz->trips.critical.flags.valid) {
295 if (crt == -1) {
296 tz->trips.critical.flags.valid = 0;
297 } else if (crt > 0) {
298 unsigned long crt_k = celsius_to_deci_kelvin(crt);
299
300 /*
301 * Allow override critical threshold
302 */
303 if (crt_k > tz->trips.critical.temperature)
304 pr_info("Critical threshold %d C\n", crt);
305
306 tz->trips.critical.temperature = crt_k;
307 }
308 }
309 }
310
311 /* Critical Sleep (optional) */
312 if (flag & ACPI_TRIPS_HOT) {
313 status = acpi_evaluate_integer(tz->device->handle, "_HOT", NULL, &tmp);
314 if (ACPI_FAILURE(status)) {
315 tz->trips.hot.flags.valid = 0;
316 acpi_handle_debug(tz->device->handle,
317 "No hot threshold\n");
318 } else {
319 tz->trips.hot.temperature = tmp;
320 tz->trips.hot.flags.valid = 1;
321 acpi_handle_debug(tz->device->handle,
322 "Found hot threshold [%lu]\n",
323 tz->trips.hot.temperature);
324 }
325 }
326
327 /* Passive (optional) */
328 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
329 flag == ACPI_TRIPS_INIT) {
330 valid = tz->trips.passive.flags.valid;
331 if (psv == -1) {
332 status = AE_SUPPORT;
333 } else if (psv > 0) {
334 tmp = celsius_to_deci_kelvin(psv);
335 status = AE_OK;
336 } else {
337 status = acpi_evaluate_integer(tz->device->handle,
338 "_PSV", NULL, &tmp);
339 }
340
341 if (ACPI_FAILURE(status)) {
342 tz->trips.passive.flags.valid = 0;
343 } else {
344 tz->trips.passive.temperature = tmp;
345 tz->trips.passive.flags.valid = 1;
346 if (flag == ACPI_TRIPS_INIT) {
347 status = acpi_evaluate_integer(tz->device->handle,
348 "_TC1", NULL, &tmp);
349 if (ACPI_FAILURE(status))
350 tz->trips.passive.flags.valid = 0;
351 else
352 tz->trips.passive.tc1 = tmp;
353
354 status = acpi_evaluate_integer(tz->device->handle,
355 "_TC2", NULL, &tmp);
356 if (ACPI_FAILURE(status))
357 tz->trips.passive.flags.valid = 0;
358 else
359 tz->trips.passive.tc2 = tmp;
360
361 status = acpi_evaluate_integer(tz->device->handle,
362 "_TSP", NULL, &tmp);
363 if (ACPI_FAILURE(status))
364 tz->trips.passive.flags.valid = 0;
365 else
366 tz->trips.passive.tsp = tmp;
367 }
368 }
369 }
370 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
371 memset(&devices, 0, sizeof(struct acpi_handle_list));
372 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
373 NULL, &devices);
374 if (ACPI_FAILURE(status)) {
375 acpi_handle_info(tz->device->handle,
376 "Invalid passive threshold\n");
377 tz->trips.passive.flags.valid = 0;
378 } else {
379 tz->trips.passive.flags.valid = 1;
380 }
381
382 if (memcmp(&tz->trips.passive.devices, &devices,
383 sizeof(struct acpi_handle_list))) {
384 memcpy(&tz->trips.passive.devices, &devices,
385 sizeof(struct acpi_handle_list));
386 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
387 }
388 }
389 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
390 if (valid != tz->trips.passive.flags.valid)
391 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
392 }
393
394 /* Active (optional) */
395 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
396 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
397 valid = tz->trips.active[i].flags.valid;
398
399 if (act == -1)
400 break; /* disable all active trip points */
401
402 if (flag == ACPI_TRIPS_INIT || ((flag & ACPI_TRIPS_ACTIVE) &&
403 tz->trips.active[i].flags.valid)) {
404 status = acpi_evaluate_integer(tz->device->handle,
405 name, NULL, &tmp);
406 if (ACPI_FAILURE(status)) {
407 tz->trips.active[i].flags.valid = 0;
408 if (i == 0)
409 break;
410
411 if (act <= 0)
412 break;
413
414 if (i == 1)
415 tz->trips.active[0].temperature = celsius_to_deci_kelvin(act);
416 else
417 /*
418 * Don't allow override higher than
419 * the next higher trip point
420 */
421 tz->trips.active[i-1].temperature =
422 (tz->trips.active[i-2].temperature <
423 celsius_to_deci_kelvin(act) ?
424 tz->trips.active[i-2].temperature :
425 celsius_to_deci_kelvin(act));
426
427 break;
428 } else {
429 tz->trips.active[i].temperature = tmp;
430 tz->trips.active[i].flags.valid = 1;
431 }
432 }
433
434 name[2] = 'L';
435 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid) {
436 memset(&devices, 0, sizeof(struct acpi_handle_list));
437 status = acpi_evaluate_reference(tz->device->handle,
438 name, NULL, &devices);
439 if (ACPI_FAILURE(status)) {
440 acpi_handle_info(tz->device->handle,
441 "Invalid active%d threshold\n", i);
442 tz->trips.active[i].flags.valid = 0;
443 } else {
444 tz->trips.active[i].flags.valid = 1;
445 }
446
447 if (memcmp(&tz->trips.active[i].devices, &devices,
448 sizeof(struct acpi_handle_list))) {
449 memcpy(&tz->trips.active[i].devices, &devices,
450 sizeof(struct acpi_handle_list));
451 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
452 }
453 }
454 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
455 if (valid != tz->trips.active[i].flags.valid)
456 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
457
458 if (!tz->trips.active[i].flags.valid)
459 break;
460 }
461
462 if (flag & ACPI_TRIPS_DEVICES) {
463 memset(&devices, 0, sizeof(devices));
464 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
465 NULL, &devices);
466 if (ACPI_SUCCESS(status) &&
467 memcmp(&tz->devices, &devices, sizeof(devices))) {
468 tz->devices = devices;
469 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
470 }
471 }
472
473 return 0;
474}
475
476static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
477{
478 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
479
480 if (ret)
481 return ret;
482
483 valid = tz->trips.critical.flags.valid |
484 tz->trips.hot.flags.valid |
485 tz->trips.passive.flags.valid;
486
487 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
488 valid |= tz->trips.active[i].flags.valid;
489
490 if (!valid) {
491 pr_warn(FW_BUG "No valid trip found\n");
492 return -ENODEV;
493 }
494 return 0;
495}
496
497/* sys I/F for generic thermal sysfs support */
498
499static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
500{
501 struct acpi_thermal *tz = thermal->devdata;
502 int result;
503
504 if (!tz)
505 return -EINVAL;
506
507 result = acpi_thermal_get_temperature(tz);
508 if (result)
509 return result;
510
511 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temperature,
512 tz->kelvin_offset);
513 return 0;
514}
515
516static int thermal_get_trip_type(struct thermal_zone_device *thermal,
517 int trip, enum thermal_trip_type *type)
518{
519 struct acpi_thermal *tz = thermal->devdata;
520 int i;
521
522 if (!tz || trip < 0)
523 return -EINVAL;
524
525 if (tz->trips.critical.flags.valid) {
526 if (!trip) {
527 *type = THERMAL_TRIP_CRITICAL;
528 return 0;
529 }
530 trip--;
531 }
532
533 if (tz->trips.hot.flags.valid) {
534 if (!trip) {
535 *type = THERMAL_TRIP_HOT;
536 return 0;
537 }
538 trip--;
539 }
540
541 if (tz->trips.passive.flags.valid) {
542 if (!trip) {
543 *type = THERMAL_TRIP_PASSIVE;
544 return 0;
545 }
546 trip--;
547 }
548
549 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].flags.valid; i++) {
550 if (!trip) {
551 *type = THERMAL_TRIP_ACTIVE;
552 return 0;
553 }
554 trip--;
555 }
556
557 return -EINVAL;
558}
559
560static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
561 int trip, int *temp)
562{
563 struct acpi_thermal *tz = thermal->devdata;
564 int i;
565
566 if (!tz || trip < 0)
567 return -EINVAL;
568
569 if (tz->trips.critical.flags.valid) {
570 if (!trip) {
571 *temp = deci_kelvin_to_millicelsius_with_offset(
572 tz->trips.critical.temperature,
573 tz->kelvin_offset);
574 return 0;
575 }
576 trip--;
577 }
578
579 if (tz->trips.hot.flags.valid) {
580 if (!trip) {
581 *temp = deci_kelvin_to_millicelsius_with_offset(
582 tz->trips.hot.temperature,
583 tz->kelvin_offset);
584 return 0;
585 }
586 trip--;
587 }
588
589 if (tz->trips.passive.flags.valid) {
590 if (!trip) {
591 *temp = deci_kelvin_to_millicelsius_with_offset(
592 tz->trips.passive.temperature,
593 tz->kelvin_offset);
594 return 0;
595 }
596 trip--;
597 }
598
599 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
600 tz->trips.active[i].flags.valid; i++) {
601 if (!trip) {
602 *temp = deci_kelvin_to_millicelsius_with_offset(
603 tz->trips.active[i].temperature,
604 tz->kelvin_offset);
605 return 0;
606 }
607 trip--;
608 }
609
610 return -EINVAL;
611}
612
613static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
614 int *temperature)
615{
616 struct acpi_thermal *tz = thermal->devdata;
617
618 if (tz->trips.critical.flags.valid) {
619 *temperature = deci_kelvin_to_millicelsius_with_offset(
620 tz->trips.critical.temperature,
621 tz->kelvin_offset);
622 return 0;
623 }
624
625 return -EINVAL;
626}
627
628static int thermal_get_trend(struct thermal_zone_device *thermal,
629 int trip, enum thermal_trend *trend)
630{
631 struct acpi_thermal *tz = thermal->devdata;
632 enum thermal_trip_type type;
633 int i;
634
635 if (thermal_get_trip_type(thermal, trip, &type))
636 return -EINVAL;
637
638 if (type == THERMAL_TRIP_ACTIVE) {
639 int trip_temp;
640 int temp = deci_kelvin_to_millicelsius_with_offset(
641 tz->temperature, tz->kelvin_offset);
642 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
643 return -EINVAL;
644
645 if (temp > trip_temp) {
646 *trend = THERMAL_TREND_RAISING;
647 return 0;
648 } else {
649 /* Fall back on default trend */
650 return -EINVAL;
651 }
652 }
653
654 /*
655 * tz->temperature has already been updated by generic thermal layer,
656 * before this callback being invoked
657 */
658 i = tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature) +
659 tz->trips.passive.tc2 * (tz->temperature - tz->trips.passive.temperature);
660
661 if (i > 0)
662 *trend = THERMAL_TREND_RAISING;
663 else if (i < 0)
664 *trend = THERMAL_TREND_DROPPING;
665 else
666 *trend = THERMAL_TREND_STABLE;
667
668 return 0;
669}
670
671static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
672{
673 struct acpi_thermal *tz = thermal->devdata;
674
675 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
676 dev_name(&tz->device->dev),
677 ACPI_THERMAL_NOTIFY_HOT, 1);
678}
679
680static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
681{
682 struct acpi_thermal *tz = thermal->devdata;
683
684 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
685 dev_name(&tz->device->dev),
686 ACPI_THERMAL_NOTIFY_CRITICAL, 1);
687
688 thermal_zone_device_critical(thermal);
689}
690
691static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
692 struct thermal_cooling_device *cdev,
693 bool bind)
694{
695 struct acpi_device *device = cdev->devdata;
696 struct acpi_thermal *tz = thermal->devdata;
697 struct acpi_device *dev;
698 acpi_handle handle;
699 int i;
700 int j;
701 int trip = -1;
702 int result = 0;
703
704 if (tz->trips.critical.flags.valid)
705 trip++;
706
707 if (tz->trips.hot.flags.valid)
708 trip++;
709
710 if (tz->trips.passive.flags.valid) {
711 trip++;
712 for (i = 0; i < tz->trips.passive.devices.count; i++) {
713 handle = tz->trips.passive.devices.handles[i];
714 dev = acpi_fetch_acpi_dev(handle);
715 if (dev != device)
716 continue;
717
718 if (bind)
719 result = thermal_zone_bind_cooling_device(
720 thermal, trip, cdev,
721 THERMAL_NO_LIMIT,
722 THERMAL_NO_LIMIT,
723 THERMAL_WEIGHT_DEFAULT);
724 else
725 result =
726 thermal_zone_unbind_cooling_device(
727 thermal, trip, cdev);
728
729 if (result)
730 goto failed;
731 }
732 }
733
734 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
735 if (!tz->trips.active[i].flags.valid)
736 break;
737
738 trip++;
739 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
740 handle = tz->trips.active[i].devices.handles[j];
741 dev = acpi_fetch_acpi_dev(handle);
742 if (dev != device)
743 continue;
744
745 if (bind)
746 result = thermal_zone_bind_cooling_device(
747 thermal, trip, cdev,
748 THERMAL_NO_LIMIT,
749 THERMAL_NO_LIMIT,
750 THERMAL_WEIGHT_DEFAULT);
751 else
752 result = thermal_zone_unbind_cooling_device(
753 thermal, trip, cdev);
754
755 if (result)
756 goto failed;
757 }
758 }
759
760failed:
761 return result;
762}
763
764static int
765acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
766 struct thermal_cooling_device *cdev)
767{
768 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
769}
770
771static int
772acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
773 struct thermal_cooling_device *cdev)
774{
775 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
776}
777
778static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
779 .bind = acpi_thermal_bind_cooling_device,
780 .unbind = acpi_thermal_unbind_cooling_device,
781 .get_temp = thermal_get_temp,
782 .get_trip_type = thermal_get_trip_type,
783 .get_trip_temp = thermal_get_trip_temp,
784 .get_crit_temp = thermal_get_crit_temp,
785 .get_trend = thermal_get_trend,
786 .hot = acpi_thermal_zone_device_hot,
787 .critical = acpi_thermal_zone_device_critical,
788};
789
790static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
791{
792 int trips = 0;
793 int result;
794 acpi_status status;
795 int i;
796
797 if (tz->trips.critical.flags.valid)
798 trips++;
799
800 if (tz->trips.hot.flags.valid)
801 trips++;
802
803 if (tz->trips.passive.flags.valid)
804 trips++;
805
806 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].flags.valid;
807 i++, trips++);
808
809 if (tz->trips.passive.flags.valid)
810 tz->thermal_zone = thermal_zone_device_register("acpitz", trips, 0, tz,
811 &acpi_thermal_zone_ops, NULL,
812 tz->trips.passive.tsp * 100,
813 tz->polling_frequency * 100);
814 else
815 tz->thermal_zone =
816 thermal_zone_device_register("acpitz", trips, 0, tz,
817 &acpi_thermal_zone_ops, NULL,
818 0, tz->polling_frequency * 100);
819
820 if (IS_ERR(tz->thermal_zone))
821 return -ENODEV;
822
823 result = sysfs_create_link(&tz->device->dev.kobj,
824 &tz->thermal_zone->device.kobj, "thermal_zone");
825 if (result)
826 goto unregister_tzd;
827
828 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
829 &tz->device->dev.kobj, "device");
830 if (result)
831 goto remove_tz_link;
832
833 status = acpi_bus_attach_private_data(tz->device->handle,
834 tz->thermal_zone);
835 if (ACPI_FAILURE(status)) {
836 result = -ENODEV;
837 goto remove_dev_link;
838 }
839
840 result = thermal_zone_device_enable(tz->thermal_zone);
841 if (result)
842 goto acpi_bus_detach;
843
844 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
845 tz->thermal_zone->id);
846
847 return 0;
848
849acpi_bus_detach:
850 acpi_bus_detach_private_data(tz->device->handle);
851remove_dev_link:
852 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
853remove_tz_link:
854 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
855unregister_tzd:
856 thermal_zone_device_unregister(tz->thermal_zone);
857
858 return result;
859}
860
861static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
862{
863 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
864 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
865 thermal_zone_device_unregister(tz->thermal_zone);
866 tz->thermal_zone = NULL;
867 acpi_bus_detach_private_data(tz->device->handle);
868}
869
870
871/* --------------------------------------------------------------------------
872 Driver Interface
873 -------------------------------------------------------------------------- */
874
875static void acpi_queue_thermal_check(struct acpi_thermal *tz)
876{
877 if (!work_pending(&tz->thermal_check_work))
878 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
879}
880
881static void acpi_thermal_notify(struct acpi_device *device, u32 event)
882{
883 struct acpi_thermal *tz = acpi_driver_data(device);
884
885 if (!tz)
886 return;
887
888 switch (event) {
889 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
890 acpi_queue_thermal_check(tz);
891 break;
892 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
893 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
894 acpi_queue_thermal_check(tz);
895 acpi_bus_generate_netlink_event(device->pnp.device_class,
896 dev_name(&device->dev), event, 0);
897 break;
898 case ACPI_THERMAL_NOTIFY_DEVICES:
899 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
900 acpi_queue_thermal_check(tz);
901 acpi_bus_generate_netlink_event(device->pnp.device_class,
902 dev_name(&device->dev), event, 0);
903 break;
904 default:
905 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
906 event);
907 break;
908 }
909}
910
911/*
912 * On some platforms, the AML code has dependency about
913 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
914 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
915 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
916 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
917 * if _TMP has never been evaluated.
918 *
919 * As this dependency is totally transparent to OS, evaluate
920 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
921 * _TMP, before they are actually used.
922 */
923static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
924{
925 acpi_handle handle = tz->device->handle;
926 unsigned long long value;
927 int i;
928
929 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
930 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
931 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
932 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
933 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
934 acpi_status status;
935
936 status = acpi_evaluate_integer(handle, name, NULL, &value);
937 if (status == AE_NOT_FOUND)
938 break;
939 }
940 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
941}
942
943static int acpi_thermal_get_info(struct acpi_thermal *tz)
944{
945 int result;
946
947 if (!tz)
948 return -EINVAL;
949
950 acpi_thermal_aml_dependency_fix(tz);
951
952 /* Get trip points [_CRT, _PSV, etc.] (required) */
953 result = acpi_thermal_get_trip_points(tz);
954 if (result)
955 return result;
956
957 /* Get temperature [_TMP] (required) */
958 result = acpi_thermal_get_temperature(tz);
959 if (result)
960 return result;
961
962 /* Set the cooling mode [_SCP] to active cooling (default) */
963 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
964 if (!result)
965 tz->flags.cooling_mode = 1;
966
967 /* Get default polling frequency [_TZP] (optional) */
968 if (tzp)
969 tz->polling_frequency = tzp;
970 else
971 acpi_thermal_get_polling_frequency(tz);
972
973 return 0;
974}
975
976/*
977 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
978 * handles temperature values with a single decimal place. As a consequence,
979 * some implementations use an offset of 273.1 and others use an offset of
980 * 273.2. Try to find out which one is being used, to present the most
981 * accurate and visually appealing number.
982 *
983 * The heuristic below should work for all ACPI thermal zones which have a
984 * critical trip point with a value being a multiple of 0.5 degree Celsius.
985 */
986static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
987{
988 if (tz->trips.critical.flags.valid &&
989 (tz->trips.critical.temperature % 5) == 1)
990 tz->kelvin_offset = 273100;
991 else
992 tz->kelvin_offset = 273200;
993}
994
995static void acpi_thermal_check_fn(struct work_struct *work)
996{
997 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
998 thermal_check_work);
999
1000 /*
1001 * In general, it is not sufficient to check the pending bit, because
1002 * subsequent instances of this function may be queued after one of them
1003 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just
1004 * one of them is running, though, because it may have done the actual
1005 * check some time ago, so allow at least one of them to block on the
1006 * mutex while another one is running the update.
1007 */
1008 if (!refcount_dec_not_one(&tz->thermal_check_count))
1009 return;
1010
1011 mutex_lock(&tz->thermal_check_lock);
1012
1013 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
1014
1015 refcount_inc(&tz->thermal_check_count);
1016
1017 mutex_unlock(&tz->thermal_check_lock);
1018}
1019
1020static int acpi_thermal_add(struct acpi_device *device)
1021{
1022 struct acpi_thermal *tz;
1023 int result;
1024
1025 if (!device)
1026 return -EINVAL;
1027
1028 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1029 if (!tz)
1030 return -ENOMEM;
1031
1032 tz->device = device;
1033 strcpy(tz->name, device->pnp.bus_id);
1034 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1035 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1036 device->driver_data = tz;
1037
1038 result = acpi_thermal_get_info(tz);
1039 if (result)
1040 goto free_memory;
1041
1042 acpi_thermal_guess_offset(tz);
1043
1044 result = acpi_thermal_register_thermal_zone(tz);
1045 if (result)
1046 goto free_memory;
1047
1048 refcount_set(&tz->thermal_check_count, 3);
1049 mutex_init(&tz->thermal_check_lock);
1050 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1051
1052 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
1053 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature));
1054 goto end;
1055
1056free_memory:
1057 kfree(tz);
1058end:
1059 return result;
1060}
1061
1062static void acpi_thermal_remove(struct acpi_device *device)
1063{
1064 struct acpi_thermal *tz;
1065
1066 if (!device || !acpi_driver_data(device))
1067 return;
1068
1069 flush_workqueue(acpi_thermal_pm_queue);
1070 tz = acpi_driver_data(device);
1071
1072 acpi_thermal_unregister_thermal_zone(tz);
1073 kfree(tz);
1074}
1075
1076#ifdef CONFIG_PM_SLEEP
1077static int acpi_thermal_suspend(struct device *dev)
1078{
1079 /* Make sure the previously queued thermal check work has been done */
1080 flush_workqueue(acpi_thermal_pm_queue);
1081 return 0;
1082}
1083
1084static int acpi_thermal_resume(struct device *dev)
1085{
1086 struct acpi_thermal *tz;
1087 int i, j, power_state, result;
1088
1089 if (!dev)
1090 return -EINVAL;
1091
1092 tz = acpi_driver_data(to_acpi_device(dev));
1093 if (!tz)
1094 return -EINVAL;
1095
1096 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1097 if (!tz->trips.active[i].flags.valid)
1098 break;
1099
1100 tz->trips.active[i].flags.enabled = 1;
1101 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1102 result = acpi_bus_update_power(
1103 tz->trips.active[i].devices.handles[j],
1104 &power_state);
1105 if (result || (power_state != ACPI_STATE_D0)) {
1106 tz->trips.active[i].flags.enabled = 0;
1107 break;
1108 }
1109 }
1110 tz->state.active |= tz->trips.active[i].flags.enabled;
1111 }
1112
1113 acpi_queue_thermal_check(tz);
1114
1115 return AE_OK;
1116}
1117#endif
1118
1119static int thermal_act(const struct dmi_system_id *d) {
1120 if (act == 0) {
1121 pr_notice("%s detected: disabling all active thermal trip points\n",
1122 d->ident);
1123 act = -1;
1124 }
1125 return 0;
1126}
1127static int thermal_nocrt(const struct dmi_system_id *d) {
1128 pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
1129 d->ident);
1130 nocrt = 1;
1131 return 0;
1132}
1133static int thermal_tzp(const struct dmi_system_id *d) {
1134 if (tzp == 0) {
1135 pr_notice("%s detected: enabling thermal zone polling\n",
1136 d->ident);
1137 tzp = 300; /* 300 dS = 30 Seconds */
1138 }
1139 return 0;
1140}
1141static int thermal_psv(const struct dmi_system_id *d) {
1142 if (psv == 0) {
1143 pr_notice("%s detected: disabling all passive thermal trip points\n",
1144 d->ident);
1145 psv = -1;
1146 }
1147 return 0;
1148}
1149
1150static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1151 /*
1152 * Award BIOS on this AOpen makes thermal control almost worthless.
1153 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1154 */
1155 {
1156 .callback = thermal_act,
1157 .ident = "AOpen i915GMm-HFS",
1158 .matches = {
1159 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1160 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1161 },
1162 },
1163 {
1164 .callback = thermal_psv,
1165 .ident = "AOpen i915GMm-HFS",
1166 .matches = {
1167 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1168 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1169 },
1170 },
1171 {
1172 .callback = thermal_tzp,
1173 .ident = "AOpen i915GMm-HFS",
1174 .matches = {
1175 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1176 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1177 },
1178 },
1179 {
1180 .callback = thermal_nocrt,
1181 .ident = "Gigabyte GA-7ZX",
1182 .matches = {
1183 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1184 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1185 },
1186 },
1187 {}
1188};
1189
1190static int __init acpi_thermal_init(void)
1191{
1192 int result;
1193
1194 dmi_check_system(thermal_dmi_table);
1195
1196 if (off) {
1197 pr_notice("thermal control disabled\n");
1198 return -ENODEV;
1199 }
1200
1201 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1202 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1203 if (!acpi_thermal_pm_queue)
1204 return -ENODEV;
1205
1206 result = acpi_bus_register_driver(&acpi_thermal_driver);
1207 if (result < 0) {
1208 destroy_workqueue(acpi_thermal_pm_queue);
1209 return -ENODEV;
1210 }
1211
1212 return 0;
1213}
1214
1215static void __exit acpi_thermal_exit(void)
1216{
1217 acpi_bus_unregister_driver(&acpi_thermal_driver);
1218 destroy_workqueue(acpi_thermal_pm_queue);
1219}
1220
1221module_init(acpi_thermal_init);
1222module_exit(acpi_thermal_exit);