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