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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#include "internal.h"
35
36#define ACPI_THERMAL_CLASS "thermal_zone"
37#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
38#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
39#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
40#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
41#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
42#define ACPI_THERMAL_NOTIFY_HOT 0xF1
43#define ACPI_THERMAL_MODE_ACTIVE 0x00
44
45#define ACPI_THERMAL_MAX_ACTIVE 10
46#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
47
48#define ACPI_THERMAL_TRIP_PASSIVE (-1)
49
50/*
51 * This exception is thrown out in two cases:
52 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
53 * when re-evaluating the AML code.
54 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
55 * We need to re-bind the cooling devices of a thermal zone when this occurs.
56 */
57#define ACPI_THERMAL_TRIPS_EXCEPTION(tz, str) \
58do { \
59 acpi_handle_info(tz->device->handle, \
60 "ACPI thermal trip point %s changed\n" \
61 "Please report to linux-acpi@vger.kernel.org\n", str); \
62} while (0)
63
64static int act;
65module_param(act, int, 0644);
66MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
67
68static int crt;
69module_param(crt, int, 0644);
70MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
71
72static int tzp;
73module_param(tzp, int, 0444);
74MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
75
76static int off;
77module_param(off, int, 0);
78MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
79
80static int psv;
81module_param(psv, int, 0644);
82MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
83
84static struct workqueue_struct *acpi_thermal_pm_queue;
85
86struct acpi_thermal_trip {
87 unsigned long temp_dk;
88 struct acpi_handle_list devices;
89};
90
91struct acpi_thermal_passive {
92 struct acpi_thermal_trip trip;
93 unsigned long tc1;
94 unsigned long tc2;
95 unsigned long delay;
96};
97
98struct acpi_thermal_active {
99 struct acpi_thermal_trip trip;
100};
101
102struct acpi_thermal_trips {
103 struct acpi_thermal_passive passive;
104 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
105};
106
107struct acpi_thermal {
108 struct acpi_device *device;
109 acpi_bus_id name;
110 unsigned long temp_dk;
111 unsigned long last_temp_dk;
112 unsigned long polling_frequency;
113 volatile u8 zombie;
114 struct acpi_thermal_trips trips;
115 struct thermal_trip *trip_table;
116 struct thermal_zone_device *thermal_zone;
117 int kelvin_offset; /* in millidegrees */
118 struct work_struct thermal_check_work;
119 struct mutex thermal_check_lock;
120 refcount_t thermal_check_count;
121};
122
123/* --------------------------------------------------------------------------
124 Thermal Zone Management
125 -------------------------------------------------------------------------- */
126
127static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
128{
129 acpi_status status = AE_OK;
130 unsigned long long tmp;
131
132 if (!tz)
133 return -EINVAL;
134
135 tz->last_temp_dk = tz->temp_dk;
136
137 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
138 if (ACPI_FAILURE(status))
139 return -ENODEV;
140
141 tz->temp_dk = tmp;
142
143 acpi_handle_debug(tz->device->handle, "Temperature is %lu dK\n",
144 tz->temp_dk);
145
146 return 0;
147}
148
149static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
150{
151 acpi_status status = AE_OK;
152 unsigned long long tmp;
153
154 if (!tz)
155 return -EINVAL;
156
157 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
158 if (ACPI_FAILURE(status))
159 return -ENODEV;
160
161 tz->polling_frequency = tmp;
162 acpi_handle_debug(tz->device->handle, "Polling frequency is %lu dS\n",
163 tz->polling_frequency);
164
165 return 0;
166}
167
168static int acpi_thermal_temp(struct acpi_thermal *tz, int temp_deci_k)
169{
170 if (temp_deci_k == THERMAL_TEMP_INVALID)
171 return THERMAL_TEMP_INVALID;
172
173 return deci_kelvin_to_millicelsius_with_offset(temp_deci_k,
174 tz->kelvin_offset);
175}
176
177static bool acpi_thermal_trip_valid(struct acpi_thermal_trip *acpi_trip)
178{
179 return acpi_trip->temp_dk != THERMAL_TEMP_INVALID;
180}
181
182static int active_trip_index(struct acpi_thermal *tz,
183 struct acpi_thermal_trip *acpi_trip)
184{
185 struct acpi_thermal_active *active;
186
187 active = container_of(acpi_trip, struct acpi_thermal_active, trip);
188 return active - tz->trips.active;
189}
190
191static long get_passive_temp(struct acpi_thermal *tz)
192{
193 int temp;
194
195 if (acpi_passive_trip_temp(tz->device, &temp))
196 return THERMAL_TEMP_INVALID;
197
198 return temp;
199}
200
201static long get_active_temp(struct acpi_thermal *tz, int index)
202{
203 int temp;
204
205 if (acpi_active_trip_temp(tz->device, index, &temp))
206 return THERMAL_TEMP_INVALID;
207
208 /*
209 * If an override has been provided, apply it so there are no active
210 * trips with thresholds greater than the override.
211 */
212 if (act > 0) {
213 unsigned long long override = celsius_to_deci_kelvin(act);
214
215 if (temp > override)
216 return override;
217 }
218 return temp;
219}
220
221static void acpi_thermal_update_trip(struct acpi_thermal *tz,
222 const struct thermal_trip *trip)
223{
224 struct acpi_thermal_trip *acpi_trip = trip->priv;
225
226 if (trip->type == THERMAL_TRIP_PASSIVE) {
227 if (psv > 0)
228 return;
229
230 acpi_trip->temp_dk = get_passive_temp(tz);
231 } else {
232 int index = active_trip_index(tz, acpi_trip);
233
234 acpi_trip->temp_dk = get_active_temp(tz, index);
235 }
236
237 if (!acpi_thermal_trip_valid(acpi_trip))
238 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
239}
240
241static bool update_trip_devices(struct acpi_thermal *tz,
242 struct acpi_thermal_trip *acpi_trip,
243 int index, bool compare)
244{
245 struct acpi_handle_list devices = { 0 };
246 char method[] = "_PSL";
247
248 if (index != ACPI_THERMAL_TRIP_PASSIVE) {
249 method[1] = 'A';
250 method[2] = 'L';
251 method[3] = '0' + index;
252 }
253
254 if (!acpi_evaluate_reference(tz->device->handle, method, NULL, &devices)) {
255 acpi_handle_info(tz->device->handle, "%s evaluation failure\n", method);
256 return false;
257 }
258
259 if (acpi_handle_list_equal(&acpi_trip->devices, &devices)) {
260 acpi_handle_list_free(&devices);
261 return true;
262 }
263
264 if (compare)
265 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "device");
266
267 acpi_handle_list_replace(&acpi_trip->devices, &devices);
268 return true;
269}
270
271static void acpi_thermal_update_trip_devices(struct acpi_thermal *tz,
272 const struct thermal_trip *trip)
273{
274 struct acpi_thermal_trip *acpi_trip = trip->priv;
275 int index = trip->type == THERMAL_TRIP_PASSIVE ?
276 ACPI_THERMAL_TRIP_PASSIVE : active_trip_index(tz, acpi_trip);
277
278 if (update_trip_devices(tz, acpi_trip, index, true))
279 return;
280
281 acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
282 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
283}
284
285struct adjust_trip_data {
286 struct acpi_thermal *tz;
287 u32 event;
288};
289
290static int acpi_thermal_adjust_trip(struct thermal_trip *trip, void *data)
291{
292 struct acpi_thermal_trip *acpi_trip = trip->priv;
293 struct adjust_trip_data *atd = data;
294 struct acpi_thermal *tz = atd->tz;
295 int temp;
296
297 if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
298 return 0;
299
300 if (atd->event == ACPI_THERMAL_NOTIFY_THRESHOLDS)
301 acpi_thermal_update_trip(tz, trip);
302 else
303 acpi_thermal_update_trip_devices(tz, trip);
304
305 if (acpi_thermal_trip_valid(acpi_trip))
306 temp = acpi_thermal_temp(tz, acpi_trip->temp_dk);
307 else
308 temp = THERMAL_TEMP_INVALID;
309
310 thermal_zone_set_trip_temp(tz->thermal_zone, trip, temp);
311
312 return 0;
313}
314
315static void acpi_queue_thermal_check(struct acpi_thermal *tz)
316{
317 if (!work_pending(&tz->thermal_check_work))
318 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
319}
320
321static void acpi_thermal_trips_update(struct acpi_thermal *tz, u32 event)
322{
323 struct adjust_trip_data atd = { .tz = tz, .event = event };
324 struct acpi_device *adev = tz->device;
325
326 /*
327 * Use thermal_zone_for_each_trip() to carry out the trip points
328 * update, so as to protect thermal_get_trend() from getting stale
329 * trip point temperatures and to prevent thermal_zone_device_update()
330 * invoked from acpi_thermal_check_fn() from producing inconsistent
331 * results.
332 */
333 thermal_zone_for_each_trip(tz->thermal_zone,
334 acpi_thermal_adjust_trip, &atd);
335 acpi_queue_thermal_check(tz);
336 acpi_bus_generate_netlink_event(adev->pnp.device_class,
337 dev_name(&adev->dev), event, 0);
338}
339
340static int acpi_thermal_get_critical_trip(struct acpi_thermal *tz)
341{
342 int temp;
343
344 if (crt > 0) {
345 temp = celsius_to_deci_kelvin(crt);
346 goto set;
347 }
348 if (crt == -1) {
349 acpi_handle_debug(tz->device->handle, "Critical threshold disabled\n");
350 return THERMAL_TEMP_INVALID;
351 }
352
353 if (acpi_critical_trip_temp(tz->device, &temp))
354 return THERMAL_TEMP_INVALID;
355
356 if (temp <= 2732) {
357 /*
358 * Below zero (Celsius) values clearly aren't right for sure,
359 * so discard them as invalid.
360 */
361 pr_info(FW_BUG "Invalid critical threshold (%d)\n", temp);
362 return THERMAL_TEMP_INVALID;
363 }
364
365set:
366 acpi_handle_debug(tz->device->handle, "Critical threshold [%d]\n", temp);
367 return temp;
368}
369
370static int acpi_thermal_get_hot_trip(struct acpi_thermal *tz)
371{
372 int temp;
373
374 if (acpi_hot_trip_temp(tz->device, &temp) || temp == THERMAL_TEMP_INVALID) {
375 acpi_handle_debug(tz->device->handle, "No hot threshold\n");
376 return THERMAL_TEMP_INVALID;
377 }
378
379 acpi_handle_debug(tz->device->handle, "Hot threshold [%d]\n", temp);
380 return temp;
381}
382
383static bool passive_trip_params_init(struct acpi_thermal *tz)
384{
385 unsigned long long tmp;
386 acpi_status status;
387
388 status = acpi_evaluate_integer(tz->device->handle, "_TC1", NULL, &tmp);
389 if (ACPI_FAILURE(status))
390 return false;
391
392 tz->trips.passive.tc1 = tmp;
393
394 status = acpi_evaluate_integer(tz->device->handle, "_TC2", NULL, &tmp);
395 if (ACPI_FAILURE(status))
396 return false;
397
398 tz->trips.passive.tc2 = tmp;
399
400 status = acpi_evaluate_integer(tz->device->handle, "_TFP", NULL, &tmp);
401 if (ACPI_SUCCESS(status)) {
402 tz->trips.passive.delay = tmp;
403 return true;
404 }
405
406 status = acpi_evaluate_integer(tz->device->handle, "_TSP", NULL, &tmp);
407 if (ACPI_FAILURE(status))
408 return false;
409
410 tz->trips.passive.delay = tmp * 100;
411
412 return true;
413}
414
415static bool acpi_thermal_init_trip(struct acpi_thermal *tz, int index)
416{
417 struct acpi_thermal_trip *acpi_trip;
418 long temp;
419
420 if (index == ACPI_THERMAL_TRIP_PASSIVE) {
421 acpi_trip = &tz->trips.passive.trip;
422
423 if (psv == -1)
424 goto fail;
425
426 if (!passive_trip_params_init(tz))
427 goto fail;
428
429 temp = psv > 0 ? celsius_to_deci_kelvin(psv) :
430 get_passive_temp(tz);
431 } else {
432 acpi_trip = &tz->trips.active[index].trip;
433
434 if (act == -1)
435 goto fail;
436
437 temp = get_active_temp(tz, index);
438 }
439
440 if (temp == THERMAL_TEMP_INVALID)
441 goto fail;
442
443 if (!update_trip_devices(tz, acpi_trip, index, false))
444 goto fail;
445
446 acpi_trip->temp_dk = temp;
447 return true;
448
449fail:
450 acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
451 return false;
452}
453
454static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
455{
456 unsigned int count = 0;
457 int i;
458
459 if (acpi_thermal_init_trip(tz, ACPI_THERMAL_TRIP_PASSIVE))
460 count++;
461
462 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
463 if (acpi_thermal_init_trip(tz, i))
464 count++;
465 else
466 break;
467
468 }
469
470 while (++i < ACPI_THERMAL_MAX_ACTIVE)
471 tz->trips.active[i].trip.temp_dk = THERMAL_TEMP_INVALID;
472
473 return count;
474}
475
476/* sys I/F for generic thermal sysfs support */
477
478static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
479{
480 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
481 int result;
482
483 if (!tz)
484 return -EINVAL;
485
486 result = acpi_thermal_get_temperature(tz);
487 if (result)
488 return result;
489
490 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temp_dk,
491 tz->kelvin_offset);
492 return 0;
493}
494
495static int thermal_get_trend(struct thermal_zone_device *thermal,
496 const struct thermal_trip *trip,
497 enum thermal_trend *trend)
498{
499 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
500 struct acpi_thermal_trip *acpi_trip;
501 int t;
502
503 if (!tz || !trip)
504 return -EINVAL;
505
506 acpi_trip = trip->priv;
507 if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
508 return -EINVAL;
509
510 switch (trip->type) {
511 case THERMAL_TRIP_PASSIVE:
512 t = tz->trips.passive.tc1 * (tz->temp_dk -
513 tz->last_temp_dk) +
514 tz->trips.passive.tc2 * (tz->temp_dk -
515 acpi_trip->temp_dk);
516 if (t > 0)
517 *trend = THERMAL_TREND_RAISING;
518 else if (t < 0)
519 *trend = THERMAL_TREND_DROPPING;
520 else
521 *trend = THERMAL_TREND_STABLE;
522
523 return 0;
524
525 case THERMAL_TRIP_ACTIVE:
526 t = acpi_thermal_temp(tz, tz->temp_dk);
527 if (t <= trip->temperature)
528 break;
529
530 *trend = THERMAL_TREND_RAISING;
531
532 return 0;
533
534 default:
535 break;
536 }
537
538 return -EINVAL;
539}
540
541static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
542{
543 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
544
545 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
546 dev_name(&tz->device->dev),
547 ACPI_THERMAL_NOTIFY_HOT, 1);
548}
549
550static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
551{
552 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
553
554 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
555 dev_name(&tz->device->dev),
556 ACPI_THERMAL_NOTIFY_CRITICAL, 1);
557
558 thermal_zone_device_critical(thermal);
559}
560
561struct acpi_thermal_bind_data {
562 struct thermal_zone_device *thermal;
563 struct thermal_cooling_device *cdev;
564 bool bind;
565};
566
567static int bind_unbind_cdev_cb(struct thermal_trip *trip, void *arg)
568{
569 struct acpi_thermal_trip *acpi_trip = trip->priv;
570 struct acpi_thermal_bind_data *bd = arg;
571 struct thermal_zone_device *thermal = bd->thermal;
572 struct thermal_cooling_device *cdev = bd->cdev;
573 struct acpi_device *cdev_adev = cdev->devdata;
574 int i;
575
576 /* Skip critical and hot trips. */
577 if (!acpi_trip)
578 return 0;
579
580 for (i = 0; i < acpi_trip->devices.count; i++) {
581 acpi_handle handle = acpi_trip->devices.handles[i];
582 struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
583
584 if (adev != cdev_adev)
585 continue;
586
587 if (bd->bind) {
588 int ret;
589
590 ret = thermal_bind_cdev_to_trip(thermal, trip, cdev,
591 THERMAL_NO_LIMIT,
592 THERMAL_NO_LIMIT,
593 THERMAL_WEIGHT_DEFAULT);
594 if (ret)
595 return ret;
596 } else {
597 thermal_unbind_cdev_from_trip(thermal, trip, cdev);
598 }
599 }
600
601 return 0;
602}
603
604static int acpi_thermal_bind_unbind_cdev(struct thermal_zone_device *thermal,
605 struct thermal_cooling_device *cdev,
606 bool bind)
607{
608 struct acpi_thermal_bind_data bd = {
609 .thermal = thermal, .cdev = cdev, .bind = bind
610 };
611
612 return for_each_thermal_trip(thermal, bind_unbind_cdev_cb, &bd);
613}
614
615static int
616acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
617 struct thermal_cooling_device *cdev)
618{
619 return acpi_thermal_bind_unbind_cdev(thermal, cdev, true);
620}
621
622static int
623acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
624 struct thermal_cooling_device *cdev)
625{
626 return acpi_thermal_bind_unbind_cdev(thermal, cdev, false);
627}
628
629static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
630 .bind = acpi_thermal_bind_cooling_device,
631 .unbind = acpi_thermal_unbind_cooling_device,
632 .get_temp = thermal_get_temp,
633 .get_trend = thermal_get_trend,
634 .hot = acpi_thermal_zone_device_hot,
635 .critical = acpi_thermal_zone_device_critical,
636};
637
638static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz)
639{
640 struct device *tzdev = thermal_zone_device(tz->thermal_zone);
641 int ret;
642
643 ret = sysfs_create_link(&tz->device->dev.kobj,
644 &tzdev->kobj, "thermal_zone");
645 if (ret)
646 return ret;
647
648 ret = sysfs_create_link(&tzdev->kobj,
649 &tz->device->dev.kobj, "device");
650 if (ret)
651 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
652
653 return ret;
654}
655
656static void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz)
657{
658 struct device *tzdev = thermal_zone_device(tz->thermal_zone);
659
660 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
661 sysfs_remove_link(&tzdev->kobj, "device");
662}
663
664static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz,
665 unsigned int trip_count,
666 int passive_delay)
667{
668 int result;
669
670 tz->thermal_zone = thermal_zone_device_register_with_trips("acpitz",
671 tz->trip_table,
672 trip_count,
673 0, tz,
674 &acpi_thermal_zone_ops,
675 NULL,
676 passive_delay,
677 tz->polling_frequency * 100);
678 if (IS_ERR(tz->thermal_zone))
679 return PTR_ERR(tz->thermal_zone);
680
681 result = acpi_thermal_zone_sysfs_add(tz);
682 if (result)
683 goto unregister_tzd;
684
685 result = thermal_zone_device_enable(tz->thermal_zone);
686 if (result)
687 goto remove_links;
688
689 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
690 thermal_zone_device_id(tz->thermal_zone));
691
692 return 0;
693
694remove_links:
695 acpi_thermal_zone_sysfs_remove(tz);
696unregister_tzd:
697 thermal_zone_device_unregister(tz->thermal_zone);
698
699 return result;
700}
701
702static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
703{
704 thermal_zone_device_disable(tz->thermal_zone);
705 acpi_thermal_zone_sysfs_remove(tz);
706 thermal_zone_device_unregister(tz->thermal_zone);
707 tz->thermal_zone = NULL;
708}
709
710
711/* --------------------------------------------------------------------------
712 Driver Interface
713 -------------------------------------------------------------------------- */
714
715static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
716{
717 struct acpi_device *device = data;
718 struct acpi_thermal *tz = acpi_driver_data(device);
719
720 if (!tz)
721 return;
722
723 switch (event) {
724 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
725 acpi_queue_thermal_check(tz);
726 break;
727 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
728 case ACPI_THERMAL_NOTIFY_DEVICES:
729 acpi_thermal_trips_update(tz, event);
730 break;
731 default:
732 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
733 event);
734 break;
735 }
736}
737
738/*
739 * On some platforms, the AML code has dependency about
740 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
741 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
742 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
743 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
744 * if _TMP has never been evaluated.
745 *
746 * As this dependency is totally transparent to OS, evaluate
747 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
748 * _TMP, before they are actually used.
749 */
750static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
751{
752 acpi_handle handle = tz->device->handle;
753 unsigned long long value;
754 int i;
755
756 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
757 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
758 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
759 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
760 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
761 acpi_status status;
762
763 status = acpi_evaluate_integer(handle, name, NULL, &value);
764 if (status == AE_NOT_FOUND)
765 break;
766 }
767 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
768}
769
770/*
771 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
772 * handles temperature values with a single decimal place. As a consequence,
773 * some implementations use an offset of 273.1 and others use an offset of
774 * 273.2. Try to find out which one is being used, to present the most
775 * accurate and visually appealing number.
776 *
777 * The heuristic below should work for all ACPI thermal zones which have a
778 * critical trip point with a value being a multiple of 0.5 degree Celsius.
779 */
780static void acpi_thermal_guess_offset(struct acpi_thermal *tz, long crit_temp)
781{
782 if (crit_temp != THERMAL_TEMP_INVALID && crit_temp % 5 == 1)
783 tz->kelvin_offset = 273100;
784 else
785 tz->kelvin_offset = 273200;
786}
787
788static void acpi_thermal_check_fn(struct work_struct *work)
789{
790 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
791 thermal_check_work);
792
793 /*
794 * In general, it is not sufficient to check the pending bit, because
795 * subsequent instances of this function may be queued after one of them
796 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just
797 * one of them is running, though, because it may have done the actual
798 * check some time ago, so allow at least one of them to block on the
799 * mutex while another one is running the update.
800 */
801 if (!refcount_dec_not_one(&tz->thermal_check_count))
802 return;
803
804 mutex_lock(&tz->thermal_check_lock);
805
806 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
807
808 refcount_inc(&tz->thermal_check_count);
809
810 mutex_unlock(&tz->thermal_check_lock);
811}
812
813static void acpi_thermal_free_thermal_zone(struct acpi_thermal *tz)
814{
815 int i;
816
817 acpi_handle_list_free(&tz->trips.passive.trip.devices);
818 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
819 acpi_handle_list_free(&tz->trips.active[i].trip.devices);
820
821 kfree(tz);
822}
823
824static int acpi_thermal_add(struct acpi_device *device)
825{
826 struct acpi_thermal_trip *acpi_trip;
827 struct thermal_trip *trip;
828 struct acpi_thermal *tz;
829 unsigned int trip_count;
830 int crit_temp, hot_temp;
831 int passive_delay = 0;
832 int result;
833 int i;
834
835 if (!device)
836 return -EINVAL;
837
838 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
839 if (!tz)
840 return -ENOMEM;
841
842 tz->device = device;
843 strcpy(tz->name, device->pnp.bus_id);
844 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
845 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
846 device->driver_data = tz;
847
848 acpi_thermal_aml_dependency_fix(tz);
849
850 /* Get trip points [_CRT, _PSV, etc.] (required). */
851 trip_count = acpi_thermal_get_trip_points(tz);
852
853 crit_temp = acpi_thermal_get_critical_trip(tz);
854 if (crit_temp != THERMAL_TEMP_INVALID)
855 trip_count++;
856
857 hot_temp = acpi_thermal_get_hot_trip(tz);
858 if (hot_temp != THERMAL_TEMP_INVALID)
859 trip_count++;
860
861 if (!trip_count) {
862 pr_warn(FW_BUG "No valid trip points!\n");
863 result = -ENODEV;
864 goto free_memory;
865 }
866
867 /* Get temperature [_TMP] (required). */
868 result = acpi_thermal_get_temperature(tz);
869 if (result)
870 goto free_memory;
871
872 /* Set the cooling mode [_SCP] to active cooling. */
873 acpi_execute_simple_method(tz->device->handle, "_SCP",
874 ACPI_THERMAL_MODE_ACTIVE);
875
876 /* Determine the default polling frequency [_TZP]. */
877 if (tzp)
878 tz->polling_frequency = tzp;
879 else
880 acpi_thermal_get_polling_frequency(tz);
881
882 acpi_thermal_guess_offset(tz, crit_temp);
883
884 trip = kcalloc(trip_count, sizeof(*trip), GFP_KERNEL);
885 if (!trip) {
886 result = -ENOMEM;
887 goto free_memory;
888 }
889
890 tz->trip_table = trip;
891
892 if (crit_temp != THERMAL_TEMP_INVALID) {
893 trip->type = THERMAL_TRIP_CRITICAL;
894 trip->temperature = acpi_thermal_temp(tz, crit_temp);
895 trip++;
896 }
897
898 if (hot_temp != THERMAL_TEMP_INVALID) {
899 trip->type = THERMAL_TRIP_HOT;
900 trip->temperature = acpi_thermal_temp(tz, hot_temp);
901 trip++;
902 }
903
904 acpi_trip = &tz->trips.passive.trip;
905 if (acpi_thermal_trip_valid(acpi_trip)) {
906 passive_delay = tz->trips.passive.delay;
907
908 trip->type = THERMAL_TRIP_PASSIVE;
909 trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
910 trip->priv = acpi_trip;
911 trip++;
912 }
913
914 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
915 acpi_trip = &tz->trips.active[i].trip;
916
917 if (!acpi_thermal_trip_valid(acpi_trip))
918 break;
919
920 trip->type = THERMAL_TRIP_ACTIVE;
921 trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
922 trip->priv = acpi_trip;
923 trip++;
924 }
925
926 result = acpi_thermal_register_thermal_zone(tz, trip_count, passive_delay);
927 if (result)
928 goto free_trips;
929
930 refcount_set(&tz->thermal_check_count, 3);
931 mutex_init(&tz->thermal_check_lock);
932 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
933
934 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
935 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temp_dk));
936
937 result = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
938 acpi_thermal_notify, device);
939 if (result)
940 goto flush_wq;
941
942 return 0;
943
944flush_wq:
945 flush_workqueue(acpi_thermal_pm_queue);
946 acpi_thermal_unregister_thermal_zone(tz);
947free_trips:
948 kfree(tz->trip_table);
949free_memory:
950 acpi_thermal_free_thermal_zone(tz);
951
952 return result;
953}
954
955static void acpi_thermal_remove(struct acpi_device *device)
956{
957 struct acpi_thermal *tz;
958
959 if (!device || !acpi_driver_data(device))
960 return;
961
962 tz = acpi_driver_data(device);
963
964 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
965 acpi_thermal_notify);
966
967 flush_workqueue(acpi_thermal_pm_queue);
968 acpi_thermal_unregister_thermal_zone(tz);
969 kfree(tz->trip_table);
970 acpi_thermal_free_thermal_zone(tz);
971}
972
973#ifdef CONFIG_PM_SLEEP
974static int acpi_thermal_suspend(struct device *dev)
975{
976 /* Make sure the previously queued thermal check work has been done */
977 flush_workqueue(acpi_thermal_pm_queue);
978 return 0;
979}
980
981static int acpi_thermal_resume(struct device *dev)
982{
983 struct acpi_thermal *tz;
984 int i, j, power_state;
985
986 if (!dev)
987 return -EINVAL;
988
989 tz = acpi_driver_data(to_acpi_device(dev));
990 if (!tz)
991 return -EINVAL;
992
993 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
994 struct acpi_thermal_trip *acpi_trip = &tz->trips.active[i].trip;
995
996 if (!acpi_thermal_trip_valid(acpi_trip))
997 break;
998
999 for (j = 0; j < acpi_trip->devices.count; j++) {
1000 acpi_bus_update_power(acpi_trip->devices.handles[j],
1001 &power_state);
1002 }
1003 }
1004
1005 acpi_queue_thermal_check(tz);
1006
1007 return AE_OK;
1008}
1009#else
1010#define acpi_thermal_suspend NULL
1011#define acpi_thermal_resume NULL
1012#endif
1013static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
1014
1015static const struct acpi_device_id thermal_device_ids[] = {
1016 {ACPI_THERMAL_HID, 0},
1017 {"", 0},
1018};
1019MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
1020
1021static struct acpi_driver acpi_thermal_driver = {
1022 .name = "thermal",
1023 .class = ACPI_THERMAL_CLASS,
1024 .ids = thermal_device_ids,
1025 .ops = {
1026 .add = acpi_thermal_add,
1027 .remove = acpi_thermal_remove,
1028 },
1029 .drv.pm = &acpi_thermal_pm,
1030};
1031
1032static int thermal_act(const struct dmi_system_id *d)
1033{
1034 if (act == 0) {
1035 pr_notice("%s detected: disabling all active thermal trip points\n",
1036 d->ident);
1037 act = -1;
1038 }
1039 return 0;
1040}
1041
1042static int thermal_nocrt(const struct dmi_system_id *d)
1043{
1044 pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
1045 d->ident);
1046 crt = -1;
1047 return 0;
1048}
1049
1050static int thermal_tzp(const struct dmi_system_id *d)
1051{
1052 if (tzp == 0) {
1053 pr_notice("%s detected: enabling thermal zone polling\n",
1054 d->ident);
1055 tzp = 300; /* 300 dS = 30 Seconds */
1056 }
1057 return 0;
1058}
1059
1060static int thermal_psv(const struct dmi_system_id *d)
1061{
1062 if (psv == 0) {
1063 pr_notice("%s detected: disabling all passive thermal trip points\n",
1064 d->ident);
1065 psv = -1;
1066 }
1067 return 0;
1068}
1069
1070static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1071 /*
1072 * Award BIOS on this AOpen makes thermal control almost worthless.
1073 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1074 */
1075 {
1076 .callback = thermal_act,
1077 .ident = "AOpen i915GMm-HFS",
1078 .matches = {
1079 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1080 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1081 },
1082 },
1083 {
1084 .callback = thermal_psv,
1085 .ident = "AOpen i915GMm-HFS",
1086 .matches = {
1087 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1088 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1089 },
1090 },
1091 {
1092 .callback = thermal_tzp,
1093 .ident = "AOpen i915GMm-HFS",
1094 .matches = {
1095 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1096 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1097 },
1098 },
1099 {
1100 .callback = thermal_nocrt,
1101 .ident = "Gigabyte GA-7ZX",
1102 .matches = {
1103 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1104 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1105 },
1106 },
1107 {}
1108};
1109
1110static int __init acpi_thermal_init(void)
1111{
1112 int result;
1113
1114 dmi_check_system(thermal_dmi_table);
1115
1116 if (off) {
1117 pr_notice("thermal control disabled\n");
1118 return -ENODEV;
1119 }
1120
1121 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1122 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1123 if (!acpi_thermal_pm_queue)
1124 return -ENODEV;
1125
1126 result = acpi_bus_register_driver(&acpi_thermal_driver);
1127 if (result < 0) {
1128 destroy_workqueue(acpi_thermal_pm_queue);
1129 return -ENODEV;
1130 }
1131
1132 return 0;
1133}
1134
1135static void __exit acpi_thermal_exit(void)
1136{
1137 acpi_bus_unregister_driver(&acpi_thermal_driver);
1138 destroy_workqueue(acpi_thermal_pm_queue);
1139}
1140
1141module_init(acpi_thermal_init);
1142module_exit(acpi_thermal_exit);
1143
1144MODULE_IMPORT_NS(ACPI_THERMAL);
1145MODULE_AUTHOR("Paul Diefenbaugh");
1146MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
1147MODULE_LICENSE("GPL");