Loading...
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 trip points [_CRT, _PSV, etc.] (required) */
945 result = acpi_thermal_get_trip_points(tz);
946 if (result)
947 return result;
948
949 /* Get temperature [_TMP] (required) */
950 result = acpi_thermal_get_temperature(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 int 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 = 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_handle_debug(tz->device->handle,
285 "No critical threshold\n");
286 } else if (tmp <= 2732) {
287 pr_info(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_handle_debug(tz->device->handle,
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_info("Critical threshold %d C\n", crt);
307
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_handle_debug(tz->device->handle,
320 "No hot threshold\n");
321 } else {
322 tz->trips.hot.temperature = tmp;
323 tz->trips.hot.flags.valid = 1;
324 acpi_handle_debug(tz->device->handle,
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 acpi_handle_info(tz->device->handle,
380 "Invalid passive threshold\n");
381 tz->trips.passive.flags.valid = 0;
382 }
383 else
384 tz->trips.passive.flags.valid = 1;
385
386 if (memcmp(&tz->trips.passive.devices, &devices,
387 sizeof(struct acpi_handle_list))) {
388 memcpy(&tz->trips.passive.devices, &devices,
389 sizeof(struct acpi_handle_list));
390 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
391 }
392 }
393 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
394 if (valid != tz->trips.passive.flags.valid)
395 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
396 }
397
398 /* Active (optional) */
399 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
400 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
401 valid = tz->trips.active[i].flags.valid;
402
403 if (act == -1)
404 break; /* disable all active trip points */
405
406 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
407 tz->trips.active[i].flags.valid)) {
408 status = acpi_evaluate_integer(tz->device->handle,
409 name, NULL, &tmp);
410 if (ACPI_FAILURE(status)) {
411 tz->trips.active[i].flags.valid = 0;
412 if (i == 0)
413 break;
414 if (act <= 0)
415 break;
416 if (i == 1)
417 tz->trips.active[0].temperature =
418 celsius_to_deci_kelvin(act);
419 else
420 /*
421 * Don't allow override higher than
422 * the next higher trip point
423 */
424 tz->trips.active[i - 1].temperature =
425 (tz->trips.active[i - 2].temperature <
426 celsius_to_deci_kelvin(act) ?
427 tz->trips.active[i - 2].temperature :
428 celsius_to_deci_kelvin(act));
429 break;
430 } else {
431 tz->trips.active[i].temperature = tmp;
432 tz->trips.active[i].flags.valid = 1;
433 }
434 }
435
436 name[2] = 'L';
437 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
438 memset(&devices, 0, sizeof(struct acpi_handle_list));
439 status = acpi_evaluate_reference(tz->device->handle,
440 name, NULL, &devices);
441 if (ACPI_FAILURE(status)) {
442 acpi_handle_info(tz->device->handle,
443 "Invalid active%d threshold\n", i);
444 tz->trips.active[i].flags.valid = 0;
445 }
446 else
447 tz->trips.active[i].flags.valid = 1;
448
449 if (memcmp(&tz->trips.active[i].devices, &devices,
450 sizeof(struct acpi_handle_list))) {
451 memcpy(&tz->trips.active[i].devices, &devices,
452 sizeof(struct acpi_handle_list));
453 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
454 }
455 }
456 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
457 if (valid != tz->trips.active[i].flags.valid)
458 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
459
460 if (!tz->trips.active[i].flags.valid)
461 break;
462 }
463
464 if (flag & ACPI_TRIPS_DEVICES) {
465 memset(&devices, 0, sizeof(devices));
466 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
467 NULL, &devices);
468 if (ACPI_SUCCESS(status)
469 && memcmp(&tz->devices, &devices, sizeof(devices))) {
470 tz->devices = devices;
471 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
472 }
473 }
474
475 return 0;
476}
477
478static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
479{
480 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
481
482 if (ret)
483 return ret;
484
485 valid = tz->trips.critical.flags.valid |
486 tz->trips.hot.flags.valid |
487 tz->trips.passive.flags.valid;
488
489 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
490 valid |= tz->trips.active[i].flags.valid;
491
492 if (!valid) {
493 pr_warn(FW_BUG "No valid trip found\n");
494 return -ENODEV;
495 }
496 return 0;
497}
498
499/* sys I/F for generic thermal sysfs support */
500
501static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
502{
503 struct acpi_thermal *tz = thermal->devdata;
504 int result;
505
506 if (!tz)
507 return -EINVAL;
508
509 result = acpi_thermal_get_temperature(tz);
510 if (result)
511 return result;
512
513 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temperature,
514 tz->kelvin_offset);
515 return 0;
516}
517
518static int thermal_get_trip_type(struct thermal_zone_device *thermal,
519 int trip, enum thermal_trip_type *type)
520{
521 struct acpi_thermal *tz = thermal->devdata;
522 int i;
523
524 if (!tz || trip < 0)
525 return -EINVAL;
526
527 if (tz->trips.critical.flags.valid) {
528 if (!trip) {
529 *type = THERMAL_TRIP_CRITICAL;
530 return 0;
531 }
532 trip--;
533 }
534
535 if (tz->trips.hot.flags.valid) {
536 if (!trip) {
537 *type = THERMAL_TRIP_HOT;
538 return 0;
539 }
540 trip--;
541 }
542
543 if (tz->trips.passive.flags.valid) {
544 if (!trip) {
545 *type = THERMAL_TRIP_PASSIVE;
546 return 0;
547 }
548 trip--;
549 }
550
551 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
552 tz->trips.active[i].flags.valid; i++) {
553 if (!trip) {
554 *type = THERMAL_TRIP_ACTIVE;
555 return 0;
556 }
557 trip--;
558 }
559
560 return -EINVAL;
561}
562
563static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
564 int trip, int *temp)
565{
566 struct acpi_thermal *tz = thermal->devdata;
567 int i;
568
569 if (!tz || trip < 0)
570 return -EINVAL;
571
572 if (tz->trips.critical.flags.valid) {
573 if (!trip) {
574 *temp = deci_kelvin_to_millicelsius_with_offset(
575 tz->trips.critical.temperature,
576 tz->kelvin_offset);
577 return 0;
578 }
579 trip--;
580 }
581
582 if (tz->trips.hot.flags.valid) {
583 if (!trip) {
584 *temp = deci_kelvin_to_millicelsius_with_offset(
585 tz->trips.hot.temperature,
586 tz->kelvin_offset);
587 return 0;
588 }
589 trip--;
590 }
591
592 if (tz->trips.passive.flags.valid) {
593 if (!trip) {
594 *temp = deci_kelvin_to_millicelsius_with_offset(
595 tz->trips.passive.temperature,
596 tz->kelvin_offset);
597 return 0;
598 }
599 trip--;
600 }
601
602 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
603 tz->trips.active[i].flags.valid; i++) {
604 if (!trip) {
605 *temp = deci_kelvin_to_millicelsius_with_offset(
606 tz->trips.active[i].temperature,
607 tz->kelvin_offset);
608 return 0;
609 }
610 trip--;
611 }
612
613 return -EINVAL;
614}
615
616static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
617 int *temperature)
618{
619 struct acpi_thermal *tz = thermal->devdata;
620
621 if (tz->trips.critical.flags.valid) {
622 *temperature = deci_kelvin_to_millicelsius_with_offset(
623 tz->trips.critical.temperature,
624 tz->kelvin_offset);
625 return 0;
626 } else
627 return -EINVAL;
628}
629
630static int thermal_get_trend(struct thermal_zone_device *thermal,
631 int trip, enum thermal_trend *trend)
632{
633 struct acpi_thermal *tz = thermal->devdata;
634 enum thermal_trip_type type;
635 int i;
636
637 if (thermal_get_trip_type(thermal, trip, &type))
638 return -EINVAL;
639
640 if (type == THERMAL_TRIP_ACTIVE) {
641 int trip_temp;
642 int temp = deci_kelvin_to_millicelsius_with_offset(
643 tz->temperature, tz->kelvin_offset);
644 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
645 return -EINVAL;
646
647 if (temp > trip_temp) {
648 *trend = THERMAL_TREND_RAISING;
649 return 0;
650 } else {
651 /* Fall back on default trend */
652 return -EINVAL;
653 }
654 }
655
656 /*
657 * tz->temperature has already been updated by generic thermal layer,
658 * before this callback being invoked
659 */
660 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
661 + (tz->trips.passive.tc2
662 * (tz->temperature - tz->trips.passive.temperature));
663
664 if (i > 0)
665 *trend = THERMAL_TREND_RAISING;
666 else if (i < 0)
667 *trend = THERMAL_TREND_DROPPING;
668 else
669 *trend = THERMAL_TREND_STABLE;
670 return 0;
671}
672
673static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
674{
675 struct acpi_thermal *tz = thermal->devdata;
676
677 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
678 dev_name(&tz->device->dev),
679 ACPI_THERMAL_NOTIFY_HOT, 1);
680}
681
682static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
683{
684 struct acpi_thermal *tz = thermal->devdata;
685
686 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
687 dev_name(&tz->device->dev),
688 ACPI_THERMAL_NOTIFY_CRITICAL, 1);
689
690 thermal_zone_device_critical(thermal);
691}
692
693static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
694 struct thermal_cooling_device *cdev,
695 bool bind)
696{
697 struct acpi_device *device = cdev->devdata;
698 struct acpi_thermal *tz = thermal->devdata;
699 struct acpi_device *dev;
700 acpi_status status;
701 acpi_handle handle;
702 int i;
703 int j;
704 int trip = -1;
705 int result = 0;
706
707 if (tz->trips.critical.flags.valid)
708 trip++;
709
710 if (tz->trips.hot.flags.valid)
711 trip++;
712
713 if (tz->trips.passive.flags.valid) {
714 trip++;
715 for (i = 0; i < tz->trips.passive.devices.count;
716 i++) {
717 handle = tz->trips.passive.devices.handles[i];
718 status = acpi_bus_get_device(handle, &dev);
719 if (ACPI_FAILURE(status) || dev != device)
720 continue;
721 if (bind)
722 result =
723 thermal_zone_bind_cooling_device
724 (thermal, trip, cdev,
725 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
726 THERMAL_WEIGHT_DEFAULT);
727 else
728 result =
729 thermal_zone_unbind_cooling_device
730 (thermal, trip, cdev);
731 if (result)
732 goto failed;
733 }
734 }
735
736 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
737 if (!tz->trips.active[i].flags.valid)
738 break;
739 trip++;
740 for (j = 0;
741 j < tz->trips.active[i].devices.count;
742 j++) {
743 handle = tz->trips.active[i].devices.handles[j];
744 status = acpi_bus_get_device(handle, &dev);
745 if (ACPI_FAILURE(status) || dev != device)
746 continue;
747 if (bind)
748 result = thermal_zone_bind_cooling_device
749 (thermal, trip, cdev,
750 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
751 THERMAL_WEIGHT_DEFAULT);
752 else
753 result = thermal_zone_unbind_cooling_device
754 (thermal, trip, cdev);
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 &&
807 tz->trips.active[i].flags.valid; i++, trips++);
808
809 if (tz->trips.passive.flags.valid)
810 tz->thermal_zone =
811 thermal_zone_device_register("acpitz", trips, 0, tz,
812 &acpi_thermal_zone_ops, NULL,
813 tz->trips.passive.tsp*100,
814 tz->polling_frequency*100);
815 else
816 tz->thermal_zone =
817 thermal_zone_device_register("acpitz", trips, 0, tz,
818 &acpi_thermal_zone_ops, NULL,
819 0, tz->polling_frequency*100);
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
886 if (!tz)
887 return;
888
889 switch (event) {
890 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
891 acpi_queue_thermal_check(tz);
892 break;
893 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
894 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
895 acpi_queue_thermal_check(tz);
896 acpi_bus_generate_netlink_event(device->pnp.device_class,
897 dev_name(&device->dev), event, 0);
898 break;
899 case ACPI_THERMAL_NOTIFY_DEVICES:
900 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
901 acpi_queue_thermal_check(tz);
902 acpi_bus_generate_netlink_event(device->pnp.device_class,
903 dev_name(&device->dev), event, 0);
904 break;
905 default:
906 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
907 event);
908 break;
909 }
910}
911
912/*
913 * On some platforms, the AML code has dependency about
914 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
915 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
916 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
917 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
918 * if _TMP has never been evaluated.
919 *
920 * As this dependency is totally transparent to OS, evaluate
921 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
922 * _TMP, before they are actually used.
923 */
924static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
925{
926 acpi_handle handle = tz->device->handle;
927 unsigned long long value;
928 int i;
929
930 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
931 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
932 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
933 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
934 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
935 acpi_status status;
936
937 status = acpi_evaluate_integer(handle, name, NULL, &value);
938 if (status == AE_NOT_FOUND)
939 break;
940 }
941 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
942}
943
944static int acpi_thermal_get_info(struct acpi_thermal *tz)
945{
946 int result = 0;
947
948
949 if (!tz)
950 return -EINVAL;
951
952 acpi_thermal_aml_dependency_fix(tz);
953
954 /* Get trip points [_CRT, _PSV, etc.] (required) */
955 result = acpi_thermal_get_trip_points(tz);
956 if (result)
957 return result;
958
959 /* Get temperature [_TMP] (required) */
960 result = acpi_thermal_get_temperature(tz);
961 if (result)
962 return result;
963
964 /* Set the cooling mode [_SCP] to active cooling (default) */
965 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
966 if (!result)
967 tz->flags.cooling_mode = 1;
968
969 /* Get default polling frequency [_TZP] (optional) */
970 if (tzp)
971 tz->polling_frequency = tzp;
972 else
973 acpi_thermal_get_polling_frequency(tz);
974
975 return 0;
976}
977
978/*
979 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
980 * handles temperature values with a single decimal place. As a consequence,
981 * some implementations use an offset of 273.1 and others use an offset of
982 * 273.2. Try to find out which one is being used, to present the most
983 * accurate and visually appealing number.
984 *
985 * The heuristic below should work for all ACPI thermal zones which have a
986 * critical trip point with a value being a multiple of 0.5 degree Celsius.
987 */
988static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
989{
990 if (tz->trips.critical.flags.valid &&
991 (tz->trips.critical.temperature % 5) == 1)
992 tz->kelvin_offset = 273100;
993 else
994 tz->kelvin_offset = 273200;
995}
996
997static void acpi_thermal_check_fn(struct work_struct *work)
998{
999 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1000 thermal_check_work);
1001
1002 /*
1003 * In general, it is not sufficient to check the pending bit, because
1004 * subsequent instances of this function may be queued after one of them
1005 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just
1006 * one of them is running, though, because it may have done the actual
1007 * check some time ago, so allow at least one of them to block on the
1008 * mutex while another one is running the update.
1009 */
1010 if (!refcount_dec_not_one(&tz->thermal_check_count))
1011 return;
1012
1013 mutex_lock(&tz->thermal_check_lock);
1014
1015 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
1016
1017 refcount_inc(&tz->thermal_check_count);
1018
1019 mutex_unlock(&tz->thermal_check_lock);
1020}
1021
1022static int acpi_thermal_add(struct acpi_device *device)
1023{
1024 int result = 0;
1025 struct acpi_thermal *tz = NULL;
1026
1027
1028 if (!device)
1029 return -EINVAL;
1030
1031 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1032 if (!tz)
1033 return -ENOMEM;
1034
1035 tz->device = device;
1036 strcpy(tz->name, device->pnp.bus_id);
1037 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1038 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1039 device->driver_data = tz;
1040
1041 result = acpi_thermal_get_info(tz);
1042 if (result)
1043 goto free_memory;
1044
1045 acpi_thermal_guess_offset(tz);
1046
1047 result = acpi_thermal_register_thermal_zone(tz);
1048 if (result)
1049 goto free_memory;
1050
1051 refcount_set(&tz->thermal_check_count, 3);
1052 mutex_init(&tz->thermal_check_lock);
1053 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1054
1055 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
1056 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature));
1057 goto end;
1058
1059free_memory:
1060 kfree(tz);
1061end:
1062 return result;
1063}
1064
1065static int acpi_thermal_remove(struct acpi_device *device)
1066{
1067 struct acpi_thermal *tz = NULL;
1068
1069 if (!device || !acpi_driver_data(device))
1070 return -EINVAL;
1071
1072 flush_workqueue(acpi_thermal_pm_queue);
1073 tz = acpi_driver_data(device);
1074
1075 acpi_thermal_unregister_thermal_zone(tz);
1076 kfree(tz);
1077 return 0;
1078}
1079
1080#ifdef CONFIG_PM_SLEEP
1081static int acpi_thermal_suspend(struct device *dev)
1082{
1083 /* Make sure the previously queued thermal check work has been done */
1084 flush_workqueue(acpi_thermal_pm_queue);
1085 return 0;
1086}
1087
1088static int acpi_thermal_resume(struct device *dev)
1089{
1090 struct acpi_thermal *tz;
1091 int i, j, power_state, result;
1092
1093 if (!dev)
1094 return -EINVAL;
1095
1096 tz = acpi_driver_data(to_acpi_device(dev));
1097 if (!tz)
1098 return -EINVAL;
1099
1100 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1101 if (!(&tz->trips.active[i]))
1102 break;
1103 if (!tz->trips.active[i].flags.valid)
1104 break;
1105 tz->trips.active[i].flags.enabled = 1;
1106 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1107 result = acpi_bus_update_power(
1108 tz->trips.active[i].devices.handles[j],
1109 &power_state);
1110 if (result || (power_state != ACPI_STATE_D0)) {
1111 tz->trips.active[i].flags.enabled = 0;
1112 break;
1113 }
1114 }
1115 tz->state.active |= tz->trips.active[i].flags.enabled;
1116 }
1117
1118 acpi_queue_thermal_check(tz);
1119
1120 return AE_OK;
1121}
1122#endif
1123
1124static int thermal_act(const struct dmi_system_id *d) {
1125
1126 if (act == 0) {
1127 pr_notice("%s detected: disabling all active thermal trip points\n",
1128 d->ident);
1129 act = -1;
1130 }
1131 return 0;
1132}
1133static int thermal_nocrt(const struct dmi_system_id *d) {
1134
1135 pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
1136 d->ident);
1137 nocrt = 1;
1138 return 0;
1139}
1140static int thermal_tzp(const struct dmi_system_id *d) {
1141
1142 if (tzp == 0) {
1143 pr_notice("%s detected: enabling thermal zone polling\n",
1144 d->ident);
1145 tzp = 300; /* 300 dS = 30 Seconds */
1146 }
1147 return 0;
1148}
1149static int thermal_psv(const struct dmi_system_id *d) {
1150
1151 if (psv == 0) {
1152 pr_notice("%s detected: disabling all passive thermal trip points\n",
1153 d->ident);
1154 psv = -1;
1155 }
1156 return 0;
1157}
1158
1159static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1160 /*
1161 * Award BIOS on this AOpen makes thermal control almost worthless.
1162 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1163 */
1164 {
1165 .callback = thermal_act,
1166 .ident = "AOpen i915GMm-HFS",
1167 .matches = {
1168 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1169 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1170 },
1171 },
1172 {
1173 .callback = thermal_psv,
1174 .ident = "AOpen i915GMm-HFS",
1175 .matches = {
1176 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1177 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1178 },
1179 },
1180 {
1181 .callback = thermal_tzp,
1182 .ident = "AOpen i915GMm-HFS",
1183 .matches = {
1184 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1185 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1186 },
1187 },
1188 {
1189 .callback = thermal_nocrt,
1190 .ident = "Gigabyte GA-7ZX",
1191 .matches = {
1192 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1193 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1194 },
1195 },
1196 {}
1197};
1198
1199static int __init acpi_thermal_init(void)
1200{
1201 int result = 0;
1202
1203 dmi_check_system(thermal_dmi_table);
1204
1205 if (off) {
1206 pr_notice("thermal control disabled\n");
1207 return -ENODEV;
1208 }
1209
1210 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1211 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1212 if (!acpi_thermal_pm_queue)
1213 return -ENODEV;
1214
1215 result = acpi_bus_register_driver(&acpi_thermal_driver);
1216 if (result < 0) {
1217 destroy_workqueue(acpi_thermal_pm_queue);
1218 return -ENODEV;
1219 }
1220
1221 return 0;
1222}
1223
1224static void __exit acpi_thermal_exit(void)
1225{
1226 acpi_bus_unregister_driver(&acpi_thermal_driver);
1227 destroy_workqueue(acpi_thermal_pm_queue);
1228
1229 return;
1230}
1231
1232module_init(acpi_thermal_init);
1233module_exit(acpi_thermal_exit);