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 MODULE_AUTHOR("Paul Diefenbaugh");
47 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
48 MODULE_LICENSE("GPL");
49
50 static int act;
51 module_param(act, int, 0644);
52 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
53
54 static int crt;
55 module_param(crt, int, 0644);
56 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
57
58 static int tzp;
59 module_param(tzp, int, 0444);
60 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
61
62 static int nocrt;
63 module_param(nocrt, int, 0);
64 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
65
66 static int off;
67 module_param(off, int, 0);
68 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
69
70 static int psv;
71 module_param(psv, int, 0644);
72 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
73
74 static struct workqueue_struct *acpi_thermal_pm_queue;
75
76 static int acpi_thermal_add(struct acpi_device *device);
77 static int acpi_thermal_remove(struct acpi_device *device);
78 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
79
80 static const struct acpi_device_id thermal_device_ids[] = {
81 {ACPI_THERMAL_HID, 0},
82 {"", 0},
83 };
84 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
85
86 #ifdef CONFIG_PM_SLEEP
87 static int acpi_thermal_suspend(struct device *dev);
88 static int acpi_thermal_resume(struct device *dev);
89 #else
90 #define acpi_thermal_suspend NULL
91 #define acpi_thermal_resume NULL
92 #endif
93 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
94
95 static struct acpi_driver acpi_thermal_driver = {
96 .name = "thermal",
97 .class = ACPI_THERMAL_CLASS,
98 .ids = thermal_device_ids,
99 .ops = {
100 .add = acpi_thermal_add,
101 .remove = acpi_thermal_remove,
102 .notify = acpi_thermal_notify,
103 },
104 .drv.pm = &acpi_thermal_pm,
105 };
106
107 struct acpi_thermal_state {
108 u8 critical:1;
109 u8 hot:1;
110 u8 passive:1;
111 u8 active:1;
112 u8 reserved:4;
113 int active_index;
114 };
115
116 struct acpi_thermal_state_flags {
117 u8 valid:1;
118 u8 enabled:1;
119 u8 reserved:6;
120 };
121
122 struct acpi_thermal_critical {
123 struct acpi_thermal_state_flags flags;
124 unsigned long temperature;
125 };
126
127 struct acpi_thermal_hot {
128 struct acpi_thermal_state_flags flags;
129 unsigned long temperature;
130 };
131
132 struct acpi_thermal_passive {
133 struct acpi_thermal_state_flags flags;
134 unsigned long temperature;
135 unsigned long tc1;
136 unsigned long tc2;
137 unsigned long tsp;
138 struct acpi_handle_list devices;
139 };
140
141 struct acpi_thermal_active {
142 struct acpi_thermal_state_flags flags;
143 unsigned long temperature;
144 struct acpi_handle_list devices;
145 };
146
147 struct acpi_thermal_trips {
148 struct acpi_thermal_critical critical;
149 struct acpi_thermal_hot hot;
150 struct acpi_thermal_passive passive;
151 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
152 };
153
154 struct acpi_thermal_flags {
155 u8 cooling_mode:1; /* _SCP */
156 u8 devices:1; /* _TZD */
157 u8 reserved:6;
158 };
159
160 struct acpi_thermal {
161 struct acpi_device *device;
162 acpi_bus_id name;
163 unsigned long temperature;
164 unsigned long last_temperature;
165 unsigned long polling_frequency;
166 volatile u8 zombie;
167 struct acpi_thermal_flags flags;
168 struct acpi_thermal_state state;
169 struct acpi_thermal_trips trips;
170 struct acpi_handle_list devices;
171 struct thermal_zone_device *thermal_zone;
172 int kelvin_offset; /* in millidegrees */
173 struct work_struct thermal_check_work;
174 struct mutex thermal_check_lock;
175 refcount_t thermal_check_count;
176 };
177
178 /* --------------------------------------------------------------------------
179 Thermal Zone Management
180 -------------------------------------------------------------------------- */
181
acpi_thermal_get_temperature(struct acpi_thermal * tz)182 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
183 {
184 acpi_status status = AE_OK;
185 unsigned long long tmp;
186
187 if (!tz)
188 return -EINVAL;
189
190 tz->last_temperature = tz->temperature;
191
192 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
193 if (ACPI_FAILURE(status))
194 return -ENODEV;
195
196 tz->temperature = tmp;
197
198 acpi_handle_debug(tz->device->handle, "Temperature is %lu dK\n",
199 tz->temperature);
200
201 return 0;
202 }
203
acpi_thermal_get_polling_frequency(struct acpi_thermal * tz)204 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
205 {
206 acpi_status status = AE_OK;
207 unsigned long long tmp;
208
209 if (!tz)
210 return -EINVAL;
211
212 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
213 if (ACPI_FAILURE(status))
214 return -ENODEV;
215
216 tz->polling_frequency = tmp;
217 acpi_handle_debug(tz->device->handle, "Polling frequency is %lu dS\n",
218 tz->polling_frequency);
219
220 return 0;
221 }
222
acpi_thermal_set_cooling_mode(struct acpi_thermal * tz,int mode)223 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
224 {
225 if (!tz)
226 return -EINVAL;
227
228 if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
229 "_SCP", mode)))
230 return -ENODEV;
231
232 return 0;
233 }
234
235 #define ACPI_TRIPS_CRITICAL 0x01
236 #define ACPI_TRIPS_HOT 0x02
237 #define ACPI_TRIPS_PASSIVE 0x04
238 #define ACPI_TRIPS_ACTIVE 0x08
239 #define ACPI_TRIPS_DEVICES 0x10
240
241 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
242 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
243
244 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
245 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
246 ACPI_TRIPS_DEVICES)
247
248 /*
249 * This exception is thrown out in two cases:
250 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
251 * when re-evaluating the AML code.
252 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
253 * We need to re-bind the cooling devices of a thermal zone when this occurs.
254 */
255 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, tz, str) \
256 do { \
257 if (flags != ACPI_TRIPS_INIT) \
258 acpi_handle_info(tz->device->handle, \
259 "ACPI thermal trip point %s changed\n" \
260 "Please report to linux-acpi@vger.kernel.org\n", str); \
261 } while (0)
262
acpi_thermal_trips_update(struct acpi_thermal * tz,int flag)263 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
264 {
265 acpi_status status;
266 unsigned long long tmp;
267 struct acpi_handle_list devices;
268 int valid = 0;
269 int i;
270
271 /* Critical Shutdown */
272 if (flag & ACPI_TRIPS_CRITICAL) {
273 status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL, &tmp);
274 tz->trips.critical.temperature = tmp;
275 /*
276 * Treat freezing temperatures as invalid as well; some
277 * BIOSes return really low values and cause reboots at startup.
278 * Below zero (Celsius) values clearly aren't right for sure..
279 * ... so lets discard those as invalid.
280 */
281 if (ACPI_FAILURE(status)) {
282 tz->trips.critical.flags.valid = 0;
283 acpi_handle_debug(tz->device->handle,
284 "No critical threshold\n");
285 } else if (tmp <= 2732) {
286 pr_info(FW_BUG "Invalid critical threshold (%llu)\n", tmp);
287 tz->trips.critical.flags.valid = 0;
288 } else {
289 tz->trips.critical.flags.valid = 1;
290 acpi_handle_debug(tz->device->handle,
291 "Found critical threshold [%lu]\n",
292 tz->trips.critical.temperature);
293 }
294 if (tz->trips.critical.flags.valid == 1) {
295 if (crt == -1) {
296 tz->trips.critical.flags.valid = 0;
297 } else if (crt > 0) {
298 unsigned long crt_k = celsius_to_deci_kelvin(crt);
299
300 /*
301 * Allow override critical threshold
302 */
303 if (crt_k > tz->trips.critical.temperature)
304 pr_info("Critical threshold %d C\n", crt);
305
306 tz->trips.critical.temperature = crt_k;
307 }
308 }
309 }
310
311 /* Critical Sleep (optional) */
312 if (flag & ACPI_TRIPS_HOT) {
313 status = acpi_evaluate_integer(tz->device->handle, "_HOT", NULL, &tmp);
314 if (ACPI_FAILURE(status)) {
315 tz->trips.hot.flags.valid = 0;
316 acpi_handle_debug(tz->device->handle,
317 "No hot threshold\n");
318 } else {
319 tz->trips.hot.temperature = tmp;
320 tz->trips.hot.flags.valid = 1;
321 acpi_handle_debug(tz->device->handle,
322 "Found hot threshold [%lu]\n",
323 tz->trips.hot.temperature);
324 }
325 }
326
327 /* Passive (optional) */
328 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
329 flag == ACPI_TRIPS_INIT) {
330 valid = tz->trips.passive.flags.valid;
331 if (psv == -1) {
332 status = AE_SUPPORT;
333 } else if (psv > 0) {
334 tmp = celsius_to_deci_kelvin(psv);
335 status = AE_OK;
336 } else {
337 status = acpi_evaluate_integer(tz->device->handle,
338 "_PSV", NULL, &tmp);
339 }
340
341 if (ACPI_FAILURE(status)) {
342 tz->trips.passive.flags.valid = 0;
343 } else {
344 tz->trips.passive.temperature = tmp;
345 tz->trips.passive.flags.valid = 1;
346 if (flag == ACPI_TRIPS_INIT) {
347 status = acpi_evaluate_integer(tz->device->handle,
348 "_TC1", NULL, &tmp);
349 if (ACPI_FAILURE(status))
350 tz->trips.passive.flags.valid = 0;
351 else
352 tz->trips.passive.tc1 = tmp;
353
354 status = acpi_evaluate_integer(tz->device->handle,
355 "_TC2", NULL, &tmp);
356 if (ACPI_FAILURE(status))
357 tz->trips.passive.flags.valid = 0;
358 else
359 tz->trips.passive.tc2 = tmp;
360
361 status = acpi_evaluate_integer(tz->device->handle,
362 "_TSP", NULL, &tmp);
363 if (ACPI_FAILURE(status))
364 tz->trips.passive.flags.valid = 0;
365 else
366 tz->trips.passive.tsp = tmp;
367 }
368 }
369 }
370 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
371 memset(&devices, 0, sizeof(struct acpi_handle_list));
372 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
373 NULL, &devices);
374 if (ACPI_FAILURE(status)) {
375 acpi_handle_info(tz->device->handle,
376 "Invalid passive threshold\n");
377 tz->trips.passive.flags.valid = 0;
378 } else {
379 tz->trips.passive.flags.valid = 1;
380 }
381
382 if (memcmp(&tz->trips.passive.devices, &devices,
383 sizeof(struct acpi_handle_list))) {
384 memcpy(&tz->trips.passive.devices, &devices,
385 sizeof(struct acpi_handle_list));
386 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
387 }
388 }
389 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
390 if (valid != tz->trips.passive.flags.valid)
391 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
392 }
393
394 /* Active (optional) */
395 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
396 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
397 valid = tz->trips.active[i].flags.valid;
398
399 if (act == -1)
400 break; /* disable all active trip points */
401
402 if (flag == ACPI_TRIPS_INIT || ((flag & ACPI_TRIPS_ACTIVE) &&
403 tz->trips.active[i].flags.valid)) {
404 status = acpi_evaluate_integer(tz->device->handle,
405 name, NULL, &tmp);
406 if (ACPI_FAILURE(status)) {
407 tz->trips.active[i].flags.valid = 0;
408 if (i == 0)
409 break;
410
411 if (act <= 0)
412 break;
413
414 if (i == 1)
415 tz->trips.active[0].temperature = celsius_to_deci_kelvin(act);
416 else
417 /*
418 * Don't allow override higher than
419 * the next higher trip point
420 */
421 tz->trips.active[i-1].temperature =
422 (tz->trips.active[i-2].temperature <
423 celsius_to_deci_kelvin(act) ?
424 tz->trips.active[i-2].temperature :
425 celsius_to_deci_kelvin(act));
426
427 break;
428 } else {
429 tz->trips.active[i].temperature = tmp;
430 tz->trips.active[i].flags.valid = 1;
431 }
432 }
433
434 name[2] = 'L';
435 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid) {
436 memset(&devices, 0, sizeof(struct acpi_handle_list));
437 status = acpi_evaluate_reference(tz->device->handle,
438 name, NULL, &devices);
439 if (ACPI_FAILURE(status)) {
440 acpi_handle_info(tz->device->handle,
441 "Invalid active%d threshold\n", i);
442 tz->trips.active[i].flags.valid = 0;
443 } else {
444 tz->trips.active[i].flags.valid = 1;
445 }
446
447 if (memcmp(&tz->trips.active[i].devices, &devices,
448 sizeof(struct acpi_handle_list))) {
449 memcpy(&tz->trips.active[i].devices, &devices,
450 sizeof(struct acpi_handle_list));
451 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
452 }
453 }
454 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
455 if (valid != tz->trips.active[i].flags.valid)
456 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
457
458 if (!tz->trips.active[i].flags.valid)
459 break;
460 }
461
462 if (flag & ACPI_TRIPS_DEVICES) {
463 memset(&devices, 0, sizeof(devices));
464 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
465 NULL, &devices);
466 if (ACPI_SUCCESS(status) &&
467 memcmp(&tz->devices, &devices, sizeof(devices))) {
468 tz->devices = devices;
469 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
470 }
471 }
472
473 return 0;
474 }
475
acpi_thermal_get_trip_points(struct acpi_thermal * tz)476 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
477 {
478 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
479
480 if (ret)
481 return ret;
482
483 valid = tz->trips.critical.flags.valid |
484 tz->trips.hot.flags.valid |
485 tz->trips.passive.flags.valid;
486
487 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
488 valid |= tz->trips.active[i].flags.valid;
489
490 if (!valid) {
491 pr_warn(FW_BUG "No valid trip found\n");
492 return -ENODEV;
493 }
494 return 0;
495 }
496
497 /* sys I/F for generic thermal sysfs support */
498
thermal_get_temp(struct thermal_zone_device * thermal,int * temp)499 static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
500 {
501 struct acpi_thermal *tz = thermal->devdata;
502 int result;
503
504 if (!tz)
505 return -EINVAL;
506
507 result = acpi_thermal_get_temperature(tz);
508 if (result)
509 return result;
510
511 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temperature,
512 tz->kelvin_offset);
513 return 0;
514 }
515
thermal_get_trip_type(struct thermal_zone_device * thermal,int trip,enum thermal_trip_type * type)516 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
517 int trip, enum thermal_trip_type *type)
518 {
519 struct acpi_thermal *tz = thermal->devdata;
520 int i;
521
522 if (!tz || trip < 0)
523 return -EINVAL;
524
525 if (tz->trips.critical.flags.valid) {
526 if (!trip) {
527 *type = THERMAL_TRIP_CRITICAL;
528 return 0;
529 }
530 trip--;
531 }
532
533 if (tz->trips.hot.flags.valid) {
534 if (!trip) {
535 *type = THERMAL_TRIP_HOT;
536 return 0;
537 }
538 trip--;
539 }
540
541 if (tz->trips.passive.flags.valid) {
542 if (!trip) {
543 *type = THERMAL_TRIP_PASSIVE;
544 return 0;
545 }
546 trip--;
547 }
548
549 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].flags.valid; i++) {
550 if (!trip) {
551 *type = THERMAL_TRIP_ACTIVE;
552 return 0;
553 }
554 trip--;
555 }
556
557 return -EINVAL;
558 }
559
thermal_get_trip_temp(struct thermal_zone_device * thermal,int trip,int * temp)560 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
561 int trip, int *temp)
562 {
563 struct acpi_thermal *tz = thermal->devdata;
564 int i;
565
566 if (!tz || trip < 0)
567 return -EINVAL;
568
569 if (tz->trips.critical.flags.valid) {
570 if (!trip) {
571 *temp = deci_kelvin_to_millicelsius_with_offset(
572 tz->trips.critical.temperature,
573 tz->kelvin_offset);
574 return 0;
575 }
576 trip--;
577 }
578
579 if (tz->trips.hot.flags.valid) {
580 if (!trip) {
581 *temp = deci_kelvin_to_millicelsius_with_offset(
582 tz->trips.hot.temperature,
583 tz->kelvin_offset);
584 return 0;
585 }
586 trip--;
587 }
588
589 if (tz->trips.passive.flags.valid) {
590 if (!trip) {
591 *temp = deci_kelvin_to_millicelsius_with_offset(
592 tz->trips.passive.temperature,
593 tz->kelvin_offset);
594 return 0;
595 }
596 trip--;
597 }
598
599 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
600 tz->trips.active[i].flags.valid; i++) {
601 if (!trip) {
602 *temp = deci_kelvin_to_millicelsius_with_offset(
603 tz->trips.active[i].temperature,
604 tz->kelvin_offset);
605 return 0;
606 }
607 trip--;
608 }
609
610 return -EINVAL;
611 }
612
thermal_get_crit_temp(struct thermal_zone_device * thermal,int * temperature)613 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
614 int *temperature)
615 {
616 struct acpi_thermal *tz = thermal->devdata;
617
618 if (tz->trips.critical.flags.valid) {
619 *temperature = deci_kelvin_to_millicelsius_with_offset(
620 tz->trips.critical.temperature,
621 tz->kelvin_offset);
622 return 0;
623 }
624
625 return -EINVAL;
626 }
627
thermal_get_trend(struct thermal_zone_device * thermal,int trip,enum thermal_trend * trend)628 static int thermal_get_trend(struct thermal_zone_device *thermal,
629 int trip, enum thermal_trend *trend)
630 {
631 struct acpi_thermal *tz = thermal->devdata;
632 enum thermal_trip_type type;
633 int i;
634
635 if (thermal_get_trip_type(thermal, trip, &type))
636 return -EINVAL;
637
638 if (type == THERMAL_TRIP_ACTIVE) {
639 int trip_temp;
640 int temp = deci_kelvin_to_millicelsius_with_offset(
641 tz->temperature, tz->kelvin_offset);
642 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
643 return -EINVAL;
644
645 if (temp > trip_temp) {
646 *trend = THERMAL_TREND_RAISING;
647 return 0;
648 } else {
649 /* Fall back on default trend */
650 return -EINVAL;
651 }
652 }
653
654 /*
655 * tz->temperature has already been updated by generic thermal layer,
656 * before this callback being invoked
657 */
658 i = tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature) +
659 tz->trips.passive.tc2 * (tz->temperature - tz->trips.passive.temperature);
660
661 if (i > 0)
662 *trend = THERMAL_TREND_RAISING;
663 else if (i < 0)
664 *trend = THERMAL_TREND_DROPPING;
665 else
666 *trend = THERMAL_TREND_STABLE;
667
668 return 0;
669 }
670
acpi_thermal_zone_device_hot(struct thermal_zone_device * thermal)671 static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
672 {
673 struct acpi_thermal *tz = thermal->devdata;
674
675 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
676 dev_name(&tz->device->dev),
677 ACPI_THERMAL_NOTIFY_HOT, 1);
678 }
679
acpi_thermal_zone_device_critical(struct thermal_zone_device * thermal)680 static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
681 {
682 struct acpi_thermal *tz = thermal->devdata;
683
684 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
685 dev_name(&tz->device->dev),
686 ACPI_THERMAL_NOTIFY_CRITICAL, 1);
687
688 thermal_zone_device_critical(thermal);
689 }
690
acpi_thermal_cooling_device_cb(struct thermal_zone_device * thermal,struct thermal_cooling_device * cdev,bool bind)691 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
692 struct thermal_cooling_device *cdev,
693 bool bind)
694 {
695 struct acpi_device *device = cdev->devdata;
696 struct acpi_thermal *tz = thermal->devdata;
697 struct acpi_device *dev;
698 acpi_handle handle;
699 int i;
700 int j;
701 int trip = -1;
702 int result = 0;
703
704 if (tz->trips.critical.flags.valid)
705 trip++;
706
707 if (tz->trips.hot.flags.valid)
708 trip++;
709
710 if (tz->trips.passive.flags.valid) {
711 trip++;
712 for (i = 0; i < tz->trips.passive.devices.count; i++) {
713 handle = tz->trips.passive.devices.handles[i];
714 dev = acpi_fetch_acpi_dev(handle);
715 if (dev != device)
716 continue;
717
718 if (bind)
719 result = thermal_zone_bind_cooling_device(
720 thermal, trip, cdev,
721 THERMAL_NO_LIMIT,
722 THERMAL_NO_LIMIT,
723 THERMAL_WEIGHT_DEFAULT);
724 else
725 result =
726 thermal_zone_unbind_cooling_device(
727 thermal, trip, cdev);
728
729 if (result)
730 goto failed;
731 }
732 }
733
734 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
735 if (!tz->trips.active[i].flags.valid)
736 break;
737
738 trip++;
739 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
740 handle = tz->trips.active[i].devices.handles[j];
741 dev = acpi_fetch_acpi_dev(handle);
742 if (dev != device)
743 continue;
744
745 if (bind)
746 result = thermal_zone_bind_cooling_device(
747 thermal, trip, cdev,
748 THERMAL_NO_LIMIT,
749 THERMAL_NO_LIMIT,
750 THERMAL_WEIGHT_DEFAULT);
751 else
752 result = thermal_zone_unbind_cooling_device(
753 thermal, trip, cdev);
754
755 if (result)
756 goto failed;
757 }
758 }
759
760 failed:
761 return result;
762 }
763
764 static int
acpi_thermal_bind_cooling_device(struct thermal_zone_device * thermal,struct thermal_cooling_device * cdev)765 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
766 struct thermal_cooling_device *cdev)
767 {
768 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
769 }
770
771 static int
acpi_thermal_unbind_cooling_device(struct thermal_zone_device * thermal,struct thermal_cooling_device * cdev)772 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
773 struct thermal_cooling_device *cdev)
774 {
775 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
776 }
777
778 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
779 .bind = acpi_thermal_bind_cooling_device,
780 .unbind = acpi_thermal_unbind_cooling_device,
781 .get_temp = thermal_get_temp,
782 .get_trip_type = thermal_get_trip_type,
783 .get_trip_temp = thermal_get_trip_temp,
784 .get_crit_temp = thermal_get_crit_temp,
785 .get_trend = thermal_get_trend,
786 .hot = acpi_thermal_zone_device_hot,
787 .critical = acpi_thermal_zone_device_critical,
788 };
789
acpi_thermal_register_thermal_zone(struct acpi_thermal * tz)790 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
791 {
792 int trips = 0;
793 int result;
794 acpi_status status;
795 int i;
796
797 if (tz->trips.critical.flags.valid)
798 trips++;
799
800 if (tz->trips.hot.flags.valid)
801 trips++;
802
803 if (tz->trips.passive.flags.valid)
804 trips++;
805
806 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].flags.valid;
807 i++, trips++);
808
809 if (tz->trips.passive.flags.valid)
810 tz->thermal_zone = thermal_zone_device_register("acpitz", trips, 0, tz,
811 &acpi_thermal_zone_ops, NULL,
812 tz->trips.passive.tsp * 100,
813 tz->polling_frequency * 100);
814 else
815 tz->thermal_zone =
816 thermal_zone_device_register("acpitz", trips, 0, tz,
817 &acpi_thermal_zone_ops, NULL,
818 0, tz->polling_frequency * 100);
819
820 if (IS_ERR(tz->thermal_zone))
821 return -ENODEV;
822
823 result = sysfs_create_link(&tz->device->dev.kobj,
824 &tz->thermal_zone->device.kobj, "thermal_zone");
825 if (result)
826 goto unregister_tzd;
827
828 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
829 &tz->device->dev.kobj, "device");
830 if (result)
831 goto remove_tz_link;
832
833 status = acpi_bus_attach_private_data(tz->device->handle,
834 tz->thermal_zone);
835 if (ACPI_FAILURE(status)) {
836 result = -ENODEV;
837 goto remove_dev_link;
838 }
839
840 result = thermal_zone_device_enable(tz->thermal_zone);
841 if (result)
842 goto acpi_bus_detach;
843
844 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
845 tz->thermal_zone->id);
846
847 return 0;
848
849 acpi_bus_detach:
850 acpi_bus_detach_private_data(tz->device->handle);
851 remove_dev_link:
852 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
853 remove_tz_link:
854 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
855 unregister_tzd:
856 thermal_zone_device_unregister(tz->thermal_zone);
857
858 return result;
859 }
860
acpi_thermal_unregister_thermal_zone(struct acpi_thermal * tz)861 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
862 {
863 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
864 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
865 thermal_zone_device_unregister(tz->thermal_zone);
866 tz->thermal_zone = NULL;
867 acpi_bus_detach_private_data(tz->device->handle);
868 }
869
870
871 /* --------------------------------------------------------------------------
872 Driver Interface
873 -------------------------------------------------------------------------- */
874
acpi_queue_thermal_check(struct acpi_thermal * tz)875 static void acpi_queue_thermal_check(struct acpi_thermal *tz)
876 {
877 if (!work_pending(&tz->thermal_check_work))
878 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
879 }
880
acpi_thermal_notify(struct acpi_device * device,u32 event)881 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
882 {
883 struct acpi_thermal *tz = acpi_driver_data(device);
884
885 if (!tz)
886 return;
887
888 switch (event) {
889 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
890 acpi_queue_thermal_check(tz);
891 break;
892 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
893 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
894 acpi_queue_thermal_check(tz);
895 acpi_bus_generate_netlink_event(device->pnp.device_class,
896 dev_name(&device->dev), event, 0);
897 break;
898 case ACPI_THERMAL_NOTIFY_DEVICES:
899 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
900 acpi_queue_thermal_check(tz);
901 acpi_bus_generate_netlink_event(device->pnp.device_class,
902 dev_name(&device->dev), event, 0);
903 break;
904 default:
905 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
906 event);
907 break;
908 }
909 }
910
911 /*
912 * On some platforms, the AML code has dependency about
913 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
914 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
915 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
916 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
917 * if _TMP has never been evaluated.
918 *
919 * As this dependency is totally transparent to OS, evaluate
920 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
921 * _TMP, before they are actually used.
922 */
acpi_thermal_aml_dependency_fix(struct acpi_thermal * tz)923 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
924 {
925 acpi_handle handle = tz->device->handle;
926 unsigned long long value;
927 int i;
928
929 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
930 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
931 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
932 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
933 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
934 acpi_status status;
935
936 status = acpi_evaluate_integer(handle, name, NULL, &value);
937 if (status == AE_NOT_FOUND)
938 break;
939 }
940 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
941 }
942
acpi_thermal_get_info(struct acpi_thermal * tz)943 static int acpi_thermal_get_info(struct acpi_thermal *tz)
944 {
945 int result;
946
947 if (!tz)
948 return -EINVAL;
949
950 acpi_thermal_aml_dependency_fix(tz);
951
952 /* Get trip points [_CRT, _PSV, etc.] (required) */
953 result = acpi_thermal_get_trip_points(tz);
954 if (result)
955 return result;
956
957 /* Get temperature [_TMP] (required) */
958 result = acpi_thermal_get_temperature(tz);
959 if (result)
960 return result;
961
962 /* Set the cooling mode [_SCP] to active cooling (default) */
963 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
964 if (!result)
965 tz->flags.cooling_mode = 1;
966
967 /* Get default polling frequency [_TZP] (optional) */
968 if (tzp)
969 tz->polling_frequency = tzp;
970 else
971 acpi_thermal_get_polling_frequency(tz);
972
973 return 0;
974 }
975
976 /*
977 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
978 * handles temperature values with a single decimal place. As a consequence,
979 * some implementations use an offset of 273.1 and others use an offset of
980 * 273.2. Try to find out which one is being used, to present the most
981 * accurate and visually appealing number.
982 *
983 * The heuristic below should work for all ACPI thermal zones which have a
984 * critical trip point with a value being a multiple of 0.5 degree Celsius.
985 */
acpi_thermal_guess_offset(struct acpi_thermal * tz)986 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
987 {
988 if (tz->trips.critical.flags.valid &&
989 (tz->trips.critical.temperature % 5) == 1)
990 tz->kelvin_offset = 273100;
991 else
992 tz->kelvin_offset = 273200;
993 }
994
acpi_thermal_check_fn(struct work_struct * work)995 static void acpi_thermal_check_fn(struct work_struct *work)
996 {
997 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
998 thermal_check_work);
999
1000 /*
1001 * In general, it is not sufficient to check the pending bit, because
1002 * subsequent instances of this function may be queued after one of them
1003 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just
1004 * one of them is running, though, because it may have done the actual
1005 * check some time ago, so allow at least one of them to block on the
1006 * mutex while another one is running the update.
1007 */
1008 if (!refcount_dec_not_one(&tz->thermal_check_count))
1009 return;
1010
1011 mutex_lock(&tz->thermal_check_lock);
1012
1013 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
1014
1015 refcount_inc(&tz->thermal_check_count);
1016
1017 mutex_unlock(&tz->thermal_check_lock);
1018 }
1019
acpi_thermal_add(struct acpi_device * device)1020 static int acpi_thermal_add(struct acpi_device *device)
1021 {
1022 struct acpi_thermal *tz;
1023 int result;
1024
1025 if (!device)
1026 return -EINVAL;
1027
1028 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1029 if (!tz)
1030 return -ENOMEM;
1031
1032 tz->device = device;
1033 strcpy(tz->name, device->pnp.bus_id);
1034 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1035 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1036 device->driver_data = tz;
1037
1038 result = acpi_thermal_get_info(tz);
1039 if (result)
1040 goto free_memory;
1041
1042 acpi_thermal_guess_offset(tz);
1043
1044 result = acpi_thermal_register_thermal_zone(tz);
1045 if (result)
1046 goto free_memory;
1047
1048 refcount_set(&tz->thermal_check_count, 3);
1049 mutex_init(&tz->thermal_check_lock);
1050 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1051
1052 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
1053 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature));
1054 goto end;
1055
1056 free_memory:
1057 kfree(tz);
1058 end:
1059 return result;
1060 }
1061
acpi_thermal_remove(struct acpi_device * device)1062 static int acpi_thermal_remove(struct acpi_device *device)
1063 {
1064 struct acpi_thermal *tz;
1065
1066 if (!device || !acpi_driver_data(device))
1067 return -EINVAL;
1068
1069 flush_workqueue(acpi_thermal_pm_queue);
1070 tz = acpi_driver_data(device);
1071
1072 acpi_thermal_unregister_thermal_zone(tz);
1073 kfree(tz);
1074 return 0;
1075 }
1076
1077 #ifdef CONFIG_PM_SLEEP
acpi_thermal_suspend(struct device * dev)1078 static int acpi_thermal_suspend(struct device *dev)
1079 {
1080 /* Make sure the previously queued thermal check work has been done */
1081 flush_workqueue(acpi_thermal_pm_queue);
1082 return 0;
1083 }
1084
acpi_thermal_resume(struct device * dev)1085 static int acpi_thermal_resume(struct device *dev)
1086 {
1087 struct acpi_thermal *tz;
1088 int i, j, power_state, result;
1089
1090 if (!dev)
1091 return -EINVAL;
1092
1093 tz = acpi_driver_data(to_acpi_device(dev));
1094 if (!tz)
1095 return -EINVAL;
1096
1097 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1098 if (!tz->trips.active[i].flags.valid)
1099 break;
1100
1101 tz->trips.active[i].flags.enabled = 1;
1102 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1103 result = acpi_bus_update_power(
1104 tz->trips.active[i].devices.handles[j],
1105 &power_state);
1106 if (result || (power_state != ACPI_STATE_D0)) {
1107 tz->trips.active[i].flags.enabled = 0;
1108 break;
1109 }
1110 }
1111 tz->state.active |= tz->trips.active[i].flags.enabled;
1112 }
1113
1114 acpi_queue_thermal_check(tz);
1115
1116 return AE_OK;
1117 }
1118 #endif
1119
thermal_act(const struct dmi_system_id * d)1120 static int thermal_act(const struct dmi_system_id *d) {
1121 if (act == 0) {
1122 pr_notice("%s detected: disabling all active thermal trip points\n",
1123 d->ident);
1124 act = -1;
1125 }
1126 return 0;
1127 }
thermal_nocrt(const struct dmi_system_id * d)1128 static int thermal_nocrt(const struct dmi_system_id *d) {
1129 pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
1130 d->ident);
1131 nocrt = 1;
1132 return 0;
1133 }
thermal_tzp(const struct dmi_system_id * d)1134 static int thermal_tzp(const struct dmi_system_id *d) {
1135 if (tzp == 0) {
1136 pr_notice("%s detected: enabling thermal zone polling\n",
1137 d->ident);
1138 tzp = 300; /* 300 dS = 30 Seconds */
1139 }
1140 return 0;
1141 }
thermal_psv(const struct dmi_system_id * d)1142 static int thermal_psv(const struct dmi_system_id *d) {
1143 if (psv == 0) {
1144 pr_notice("%s detected: disabling all passive thermal trip points\n",
1145 d->ident);
1146 psv = -1;
1147 }
1148 return 0;
1149 }
1150
1151 static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1152 /*
1153 * Award BIOS on this AOpen makes thermal control almost worthless.
1154 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1155 */
1156 {
1157 .callback = thermal_act,
1158 .ident = "AOpen i915GMm-HFS",
1159 .matches = {
1160 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1161 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1162 },
1163 },
1164 {
1165 .callback = thermal_psv,
1166 .ident = "AOpen i915GMm-HFS",
1167 .matches = {
1168 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1169 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1170 },
1171 },
1172 {
1173 .callback = thermal_tzp,
1174 .ident = "AOpen i915GMm-HFS",
1175 .matches = {
1176 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1177 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1178 },
1179 },
1180 {
1181 .callback = thermal_nocrt,
1182 .ident = "Gigabyte GA-7ZX",
1183 .matches = {
1184 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1185 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1186 },
1187 },
1188 {}
1189 };
1190
acpi_thermal_init(void)1191 static int __init acpi_thermal_init(void)
1192 {
1193 int result;
1194
1195 dmi_check_system(thermal_dmi_table);
1196
1197 if (off) {
1198 pr_notice("thermal control disabled\n");
1199 return -ENODEV;
1200 }
1201
1202 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1203 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1204 if (!acpi_thermal_pm_queue)
1205 return -ENODEV;
1206
1207 result = acpi_bus_register_driver(&acpi_thermal_driver);
1208 if (result < 0) {
1209 destroy_workqueue(acpi_thermal_pm_queue);
1210 return -ENODEV;
1211 }
1212
1213 return 0;
1214 }
1215
acpi_thermal_exit(void)1216 static void __exit acpi_thermal_exit(void)
1217 {
1218 acpi_bus_unregister_driver(&acpi_thermal_driver);
1219 destroy_workqueue(acpi_thermal_pm_queue);
1220 }
1221
1222 module_init(acpi_thermal_init);
1223 module_exit(acpi_thermal_exit);
1224
