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