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 = AE_OK;
266 unsigned long long tmp;
267 struct acpi_handle_list devices;
268 int valid = 0;
269 int i;
270
271 /* Critical Shutdown */
272 if (flag & ACPI_TRIPS_CRITICAL) {
273 status = acpi_evaluate_integer(tz->device->handle,
274 "_CRT", NULL, &tmp);
275 tz->trips.critical.temperature = tmp;
276 /*
277 * Treat freezing temperatures as invalid as well; some
278 * BIOSes return really low values and cause reboots at startup.
279 * Below zero (Celsius) values clearly aren't right for sure..
280 * ... so lets discard those as invalid.
281 */
282 if (ACPI_FAILURE(status)) {
283 tz->trips.critical.flags.valid = 0;
284 acpi_handle_debug(tz->device->handle,
285 "No critical threshold\n");
286 } else if (tmp <= 2732) {
287 pr_info(FW_BUG "Invalid critical threshold (%llu)\n",
288 tmp);
289 tz->trips.critical.flags.valid = 0;
290 } else {
291 tz->trips.critical.flags.valid = 1;
292 acpi_handle_debug(tz->device->handle,
293 "Found critical threshold [%lu]\n",
294 tz->trips.critical.temperature);
295 }
296 if (tz->trips.critical.flags.valid == 1) {
297 if (crt == -1) {
298 tz->trips.critical.flags.valid = 0;
299 } else if (crt > 0) {
300 unsigned long crt_k = celsius_to_deci_kelvin(crt);
301
302 /*
303 * Allow override critical threshold
304 */
305 if (crt_k > tz->trips.critical.temperature)
306 pr_info("Critical threshold %d C\n", crt);
307
308 tz->trips.critical.temperature = crt_k;
309 }
310 }
311 }
312
313 /* Critical Sleep (optional) */
314 if (flag & ACPI_TRIPS_HOT) {
315 status = acpi_evaluate_integer(tz->device->handle,
316 "_HOT", NULL, &tmp);
317 if (ACPI_FAILURE(status)) {
318 tz->trips.hot.flags.valid = 0;
319 acpi_handle_debug(tz->device->handle,
320 "No hot threshold\n");
321 } else {
322 tz->trips.hot.temperature = tmp;
323 tz->trips.hot.flags.valid = 1;
324 acpi_handle_debug(tz->device->handle,
325 "Found hot threshold [%lu]\n",
326 tz->trips.hot.temperature);
327 }
328 }
329
330 /* Passive (optional) */
331 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
332 (flag == ACPI_TRIPS_INIT)) {
333 valid = tz->trips.passive.flags.valid;
334 if (psv == -1) {
335 status = AE_SUPPORT;
336 } else if (psv > 0) {
337 tmp = celsius_to_deci_kelvin(psv);
338 status = AE_OK;
339 } else {
340 status = acpi_evaluate_integer(tz->device->handle,
341 "_PSV", NULL, &tmp);
342 }
343
344 if (ACPI_FAILURE(status))
345 tz->trips.passive.flags.valid = 0;
346 else {
347 tz->trips.passive.temperature = tmp;
348 tz->trips.passive.flags.valid = 1;
349 if (flag == ACPI_TRIPS_INIT) {
350 status = acpi_evaluate_integer(
351 tz->device->handle, "_TC1",
352 NULL, &tmp);
353 if (ACPI_FAILURE(status))
354 tz->trips.passive.flags.valid = 0;
355 else
356 tz->trips.passive.tc1 = tmp;
357 status = acpi_evaluate_integer(
358 tz->device->handle, "_TC2",
359 NULL, &tmp);
360 if (ACPI_FAILURE(status))
361 tz->trips.passive.flags.valid = 0;
362 else
363 tz->trips.passive.tc2 = tmp;
364 status = acpi_evaluate_integer(
365 tz->device->handle, "_TSP",
366 NULL, &tmp);
367 if (ACPI_FAILURE(status))
368 tz->trips.passive.flags.valid = 0;
369 else
370 tz->trips.passive.tsp = tmp;
371 }
372 }
373 }
374 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
375 memset(&devices, 0, sizeof(struct acpi_handle_list));
376 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
377 NULL, &devices);
378 if (ACPI_FAILURE(status)) {
379 acpi_handle_info(tz->device->handle,
380 "Invalid passive threshold\n");
381 tz->trips.passive.flags.valid = 0;
382 }
383 else
384 tz->trips.passive.flags.valid = 1;
385
386 if (memcmp(&tz->trips.passive.devices, &devices,
387 sizeof(struct acpi_handle_list))) {
388 memcpy(&tz->trips.passive.devices, &devices,
389 sizeof(struct acpi_handle_list));
390 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
391 }
392 }
393 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
394 if (valid != tz->trips.passive.flags.valid)
395 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
396 }
397
398 /* Active (optional) */
399 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
400 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
401 valid = tz->trips.active[i].flags.valid;
402
403 if (act == -1)
404 break; /* disable all active trip points */
405
406 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
407 tz->trips.active[i].flags.valid)) {
408 status = acpi_evaluate_integer(tz->device->handle,
409 name, NULL, &tmp);
410 if (ACPI_FAILURE(status)) {
411 tz->trips.active[i].flags.valid = 0;
412 if (i == 0)
413 break;
414 if (act <= 0)
415 break;
416 if (i == 1)
417 tz->trips.active[0].temperature =
418 celsius_to_deci_kelvin(act);
419 else
420 /*
421 * Don't allow override higher than
422 * the next higher trip point
423 */
424 tz->trips.active[i - 1].temperature =
425 (tz->trips.active[i - 2].temperature <
426 celsius_to_deci_kelvin(act) ?
427 tz->trips.active[i - 2].temperature :
428 celsius_to_deci_kelvin(act));
429 break;
430 } else {
431 tz->trips.active[i].temperature = tmp;
432 tz->trips.active[i].flags.valid = 1;
433 }
434 }
435
436 name[2] = 'L';
437 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
438 memset(&devices, 0, sizeof(struct acpi_handle_list));
439 status = acpi_evaluate_reference(tz->device->handle,
440 name, NULL, &devices);
441 if (ACPI_FAILURE(status)) {
442 acpi_handle_info(tz->device->handle,
443 "Invalid active%d threshold\n", i);
444 tz->trips.active[i].flags.valid = 0;
445 }
446 else
447 tz->trips.active[i].flags.valid = 1;
448
449 if (memcmp(&tz->trips.active[i].devices, &devices,
450 sizeof(struct acpi_handle_list))) {
451 memcpy(&tz->trips.active[i].devices, &devices,
452 sizeof(struct acpi_handle_list));
453 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
454 }
455 }
456 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
457 if (valid != tz->trips.active[i].flags.valid)
458 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
459
460 if (!tz->trips.active[i].flags.valid)
461 break;
462 }
463
464 if (flag & ACPI_TRIPS_DEVICES) {
465 memset(&devices, 0, sizeof(devices));
466 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
467 NULL, &devices);
468 if (ACPI_SUCCESS(status)
469 && memcmp(&tz->devices, &devices, sizeof(devices))) {
470 tz->devices = devices;
471 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
472 }
473 }
474
475 return 0;
476 }
477
acpi_thermal_get_trip_points(struct acpi_thermal * tz)478 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
479 {
480 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
481
482 if (ret)
483 return ret;
484
485 valid = tz->trips.critical.flags.valid |
486 tz->trips.hot.flags.valid |
487 tz->trips.passive.flags.valid;
488
489 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
490 valid |= tz->trips.active[i].flags.valid;
491
492 if (!valid) {
493 pr_warn(FW_BUG "No valid trip found\n");
494 return -ENODEV;
495 }
496 return 0;
497 }
498
499 /* sys I/F for generic thermal sysfs support */
500
thermal_get_temp(struct thermal_zone_device * thermal,int * temp)501 static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
502 {
503 struct acpi_thermal *tz = thermal->devdata;
504 int result;
505
506 if (!tz)
507 return -EINVAL;
508
509 result = acpi_thermal_get_temperature(tz);
510 if (result)
511 return result;
512
513 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temperature,
514 tz->kelvin_offset);
515 return 0;
516 }
517
thermal_get_trip_type(struct thermal_zone_device * thermal,int trip,enum thermal_trip_type * type)518 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
519 int trip, enum thermal_trip_type *type)
520 {
521 struct acpi_thermal *tz = thermal->devdata;
522 int i;
523
524 if (!tz || trip < 0)
525 return -EINVAL;
526
527 if (tz->trips.critical.flags.valid) {
528 if (!trip) {
529 *type = THERMAL_TRIP_CRITICAL;
530 return 0;
531 }
532 trip--;
533 }
534
535 if (tz->trips.hot.flags.valid) {
536 if (!trip) {
537 *type = THERMAL_TRIP_HOT;
538 return 0;
539 }
540 trip--;
541 }
542
543 if (tz->trips.passive.flags.valid) {
544 if (!trip) {
545 *type = THERMAL_TRIP_PASSIVE;
546 return 0;
547 }
548 trip--;
549 }
550
551 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
552 tz->trips.active[i].flags.valid; i++) {
553 if (!trip) {
554 *type = THERMAL_TRIP_ACTIVE;
555 return 0;
556 }
557 trip--;
558 }
559
560 return -EINVAL;
561 }
562
thermal_get_trip_temp(struct thermal_zone_device * thermal,int trip,int * temp)563 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
564 int trip, int *temp)
565 {
566 struct acpi_thermal *tz = thermal->devdata;
567 int i;
568
569 if (!tz || trip < 0)
570 return -EINVAL;
571
572 if (tz->trips.critical.flags.valid) {
573 if (!trip) {
574 *temp = deci_kelvin_to_millicelsius_with_offset(
575 tz->trips.critical.temperature,
576 tz->kelvin_offset);
577 return 0;
578 }
579 trip--;
580 }
581
582 if (tz->trips.hot.flags.valid) {
583 if (!trip) {
584 *temp = deci_kelvin_to_millicelsius_with_offset(
585 tz->trips.hot.temperature,
586 tz->kelvin_offset);
587 return 0;
588 }
589 trip--;
590 }
591
592 if (tz->trips.passive.flags.valid) {
593 if (!trip) {
594 *temp = deci_kelvin_to_millicelsius_with_offset(
595 tz->trips.passive.temperature,
596 tz->kelvin_offset);
597 return 0;
598 }
599 trip--;
600 }
601
602 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
603 tz->trips.active[i].flags.valid; i++) {
604 if (!trip) {
605 *temp = deci_kelvin_to_millicelsius_with_offset(
606 tz->trips.active[i].temperature,
607 tz->kelvin_offset);
608 return 0;
609 }
610 trip--;
611 }
612
613 return -EINVAL;
614 }
615
thermal_get_crit_temp(struct thermal_zone_device * thermal,int * temperature)616 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
617 int *temperature)
618 {
619 struct acpi_thermal *tz = thermal->devdata;
620
621 if (tz->trips.critical.flags.valid) {
622 *temperature = deci_kelvin_to_millicelsius_with_offset(
623 tz->trips.critical.temperature,
624 tz->kelvin_offset);
625 return 0;
626 } else
627 return -EINVAL;
628 }
629
thermal_get_trend(struct thermal_zone_device * thermal,int trip,enum thermal_trend * trend)630 static int thermal_get_trend(struct thermal_zone_device *thermal,
631 int trip, enum thermal_trend *trend)
632 {
633 struct acpi_thermal *tz = thermal->devdata;
634 enum thermal_trip_type type;
635 int i;
636
637 if (thermal_get_trip_type(thermal, trip, &type))
638 return -EINVAL;
639
640 if (type == THERMAL_TRIP_ACTIVE) {
641 int trip_temp;
642 int temp = deci_kelvin_to_millicelsius_with_offset(
643 tz->temperature, tz->kelvin_offset);
644 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
645 return -EINVAL;
646
647 if (temp > trip_temp) {
648 *trend = THERMAL_TREND_RAISING;
649 return 0;
650 } else {
651 /* Fall back on default trend */
652 return -EINVAL;
653 }
654 }
655
656 /*
657 * tz->temperature has already been updated by generic thermal layer,
658 * before this callback being invoked
659 */
660 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
661 + (tz->trips.passive.tc2
662 * (tz->temperature - tz->trips.passive.temperature));
663
664 if (i > 0)
665 *trend = THERMAL_TREND_RAISING;
666 else if (i < 0)
667 *trend = THERMAL_TREND_DROPPING;
668 else
669 *trend = THERMAL_TREND_STABLE;
670 return 0;
671 }
672
acpi_thermal_zone_device_hot(struct thermal_zone_device * thermal)673 static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
674 {
675 struct acpi_thermal *tz = thermal->devdata;
676
677 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
678 dev_name(&tz->device->dev),
679 ACPI_THERMAL_NOTIFY_HOT, 1);
680 }
681
acpi_thermal_zone_device_critical(struct thermal_zone_device * thermal)682 static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
683 {
684 struct acpi_thermal *tz = thermal->devdata;
685
686 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
687 dev_name(&tz->device->dev),
688 ACPI_THERMAL_NOTIFY_CRITICAL, 1);
689
690 thermal_zone_device_critical(thermal);
691 }
692
acpi_thermal_cooling_device_cb(struct thermal_zone_device * thermal,struct thermal_cooling_device * cdev,bool bind)693 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
694 struct thermal_cooling_device *cdev,
695 bool bind)
696 {
697 struct acpi_device *device = cdev->devdata;
698 struct acpi_thermal *tz = thermal->devdata;
699 struct acpi_device *dev;
700 acpi_status status;
701 acpi_handle handle;
702 int i;
703 int j;
704 int trip = -1;
705 int result = 0;
706
707 if (tz->trips.critical.flags.valid)
708 trip++;
709
710 if (tz->trips.hot.flags.valid)
711 trip++;
712
713 if (tz->trips.passive.flags.valid) {
714 trip++;
715 for (i = 0; i < tz->trips.passive.devices.count;
716 i++) {
717 handle = tz->trips.passive.devices.handles[i];
718 status = acpi_bus_get_device(handle, &dev);
719 if (ACPI_FAILURE(status) || dev != device)
720 continue;
721 if (bind)
722 result =
723 thermal_zone_bind_cooling_device
724 (thermal, trip, cdev,
725 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
726 THERMAL_WEIGHT_DEFAULT);
727 else
728 result =
729 thermal_zone_unbind_cooling_device
730 (thermal, trip, cdev);
731 if (result)
732 goto failed;
733 }
734 }
735
736 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
737 if (!tz->trips.active[i].flags.valid)
738 break;
739 trip++;
740 for (j = 0;
741 j < tz->trips.active[i].devices.count;
742 j++) {
743 handle = tz->trips.active[i].devices.handles[j];
744 status = acpi_bus_get_device(handle, &dev);
745 if (ACPI_FAILURE(status) || dev != device)
746 continue;
747 if (bind)
748 result = thermal_zone_bind_cooling_device
749 (thermal, trip, cdev,
750 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
751 THERMAL_WEIGHT_DEFAULT);
752 else
753 result = thermal_zone_unbind_cooling_device
754 (thermal, trip, cdev);
755 if (result)
756 goto failed;
757 }
758 }
759
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 &&
807 tz->trips.active[i].flags.valid; i++, trips++);
808
809 if (tz->trips.passive.flags.valid)
810 tz->thermal_zone =
811 thermal_zone_device_register("acpitz", trips, 0, tz,
812 &acpi_thermal_zone_ops, NULL,
813 tz->trips.passive.tsp*100,
814 tz->polling_frequency*100);
815 else
816 tz->thermal_zone =
817 thermal_zone_device_register("acpitz", trips, 0, tz,
818 &acpi_thermal_zone_ops, NULL,
819 0, tz->polling_frequency*100);
820 if (IS_ERR(tz->thermal_zone))
821 return -ENODEV;
822
823 result = sysfs_create_link(&tz->device->dev.kobj,
824 &tz->thermal_zone->device.kobj, "thermal_zone");
825 if (result)
826 goto unregister_tzd;
827
828 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
829 &tz->device->dev.kobj, "device");
830 if (result)
831 goto remove_tz_link;
832
833 status = acpi_bus_attach_private_data(tz->device->handle,
834 tz->thermal_zone);
835 if (ACPI_FAILURE(status)) {
836 result = -ENODEV;
837 goto remove_dev_link;
838 }
839
840 result = thermal_zone_device_enable(tz->thermal_zone);
841 if (result)
842 goto acpi_bus_detach;
843
844 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
845 tz->thermal_zone->id);
846
847 return 0;
848
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
886 if (!tz)
887 return;
888
889 switch (event) {
890 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
891 acpi_queue_thermal_check(tz);
892 break;
893 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
894 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
895 acpi_queue_thermal_check(tz);
896 acpi_bus_generate_netlink_event(device->pnp.device_class,
897 dev_name(&device->dev), event, 0);
898 break;
899 case ACPI_THERMAL_NOTIFY_DEVICES:
900 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
901 acpi_queue_thermal_check(tz);
902 acpi_bus_generate_netlink_event(device->pnp.device_class,
903 dev_name(&device->dev), event, 0);
904 break;
905 default:
906 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
907 event);
908 break;
909 }
910 }
911
912 /*
913 * On some platforms, the AML code has dependency about
914 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
915 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
916 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
917 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
918 * if _TMP has never been evaluated.
919 *
920 * As this dependency is totally transparent to OS, evaluate
921 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
922 * _TMP, before they are actually used.
923 */
acpi_thermal_aml_dependency_fix(struct acpi_thermal * tz)924 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
925 {
926 acpi_handle handle = tz->device->handle;
927 unsigned long long value;
928 int i;
929
930 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
931 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
932 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
933 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
934 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
935 acpi_status status;
936
937 status = acpi_evaluate_integer(handle, name, NULL, &value);
938 if (status == AE_NOT_FOUND)
939 break;
940 }
941 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
942 }
943
acpi_thermal_get_info(struct acpi_thermal * tz)944 static int acpi_thermal_get_info(struct acpi_thermal *tz)
945 {
946 int result = 0;
947
948
949 if (!tz)
950 return -EINVAL;
951
952 acpi_thermal_aml_dependency_fix(tz);
953
954 /* Get trip points [_CRT, _PSV, etc.] (required) */
955 result = acpi_thermal_get_trip_points(tz);
956 if (result)
957 return result;
958
959 /* Get temperature [_TMP] (required) */
960 result = acpi_thermal_get_temperature(tz);
961 if (result)
962 return result;
963
964 /* Set the cooling mode [_SCP] to active cooling (default) */
965 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
966 if (!result)
967 tz->flags.cooling_mode = 1;
968
969 /* Get default polling frequency [_TZP] (optional) */
970 if (tzp)
971 tz->polling_frequency = tzp;
972 else
973 acpi_thermal_get_polling_frequency(tz);
974
975 return 0;
976 }
977
978 /*
979 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
980 * handles temperature values with a single decimal place. As a consequence,
981 * some implementations use an offset of 273.1 and others use an offset of
982 * 273.2. Try to find out which one is being used, to present the most
983 * accurate and visually appealing number.
984 *
985 * The heuristic below should work for all ACPI thermal zones which have a
986 * critical trip point with a value being a multiple of 0.5 degree Celsius.
987 */
acpi_thermal_guess_offset(struct acpi_thermal * tz)988 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
989 {
990 if (tz->trips.critical.flags.valid &&
991 (tz->trips.critical.temperature % 5) == 1)
992 tz->kelvin_offset = 273100;
993 else
994 tz->kelvin_offset = 273200;
995 }
996
acpi_thermal_check_fn(struct work_struct * work)997 static void acpi_thermal_check_fn(struct work_struct *work)
998 {
999 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1000 thermal_check_work);
1001
1002 /*
1003 * In general, it is not sufficient to check the pending bit, because
1004 * subsequent instances of this function may be queued after one of them
1005 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just
1006 * one of them is running, though, because it may have done the actual
1007 * check some time ago, so allow at least one of them to block on the
1008 * mutex while another one is running the update.
1009 */
1010 if (!refcount_dec_not_one(&tz->thermal_check_count))
1011 return;
1012
1013 mutex_lock(&tz->thermal_check_lock);
1014
1015 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
1016
1017 refcount_inc(&tz->thermal_check_count);
1018
1019 mutex_unlock(&tz->thermal_check_lock);
1020 }
1021
acpi_thermal_add(struct acpi_device * device)1022 static int acpi_thermal_add(struct acpi_device *device)
1023 {
1024 int result = 0;
1025 struct acpi_thermal *tz = NULL;
1026
1027
1028 if (!device)
1029 return -EINVAL;
1030
1031 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1032 if (!tz)
1033 return -ENOMEM;
1034
1035 tz->device = device;
1036 strcpy(tz->name, device->pnp.bus_id);
1037 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1038 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1039 device->driver_data = tz;
1040
1041 result = acpi_thermal_get_info(tz);
1042 if (result)
1043 goto free_memory;
1044
1045 acpi_thermal_guess_offset(tz);
1046
1047 result = acpi_thermal_register_thermal_zone(tz);
1048 if (result)
1049 goto free_memory;
1050
1051 refcount_set(&tz->thermal_check_count, 3);
1052 mutex_init(&tz->thermal_check_lock);
1053 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1054
1055 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
1056 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature));
1057 goto end;
1058
1059 free_memory:
1060 kfree(tz);
1061 end:
1062 return result;
1063 }
1064
acpi_thermal_remove(struct acpi_device * device)1065 static int acpi_thermal_remove(struct acpi_device *device)
1066 {
1067 struct acpi_thermal *tz = NULL;
1068
1069 if (!device || !acpi_driver_data(device))
1070 return -EINVAL;
1071
1072 flush_workqueue(acpi_thermal_pm_queue);
1073 tz = acpi_driver_data(device);
1074
1075 acpi_thermal_unregister_thermal_zone(tz);
1076 kfree(tz);
1077 return 0;
1078 }
1079
1080 #ifdef CONFIG_PM_SLEEP
acpi_thermal_suspend(struct device * dev)1081 static int acpi_thermal_suspend(struct device *dev)
1082 {
1083 /* Make sure the previously queued thermal check work has been done */
1084 flush_workqueue(acpi_thermal_pm_queue);
1085 return 0;
1086 }
1087
acpi_thermal_resume(struct device * dev)1088 static int acpi_thermal_resume(struct device *dev)
1089 {
1090 struct acpi_thermal *tz;
1091 int i, j, power_state, result;
1092
1093 if (!dev)
1094 return -EINVAL;
1095
1096 tz = acpi_driver_data(to_acpi_device(dev));
1097 if (!tz)
1098 return -EINVAL;
1099
1100 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1101 if (!(&tz->trips.active[i]))
1102 break;
1103 if (!tz->trips.active[i].flags.valid)
1104 break;
1105 tz->trips.active[i].flags.enabled = 1;
1106 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1107 result = acpi_bus_update_power(
1108 tz->trips.active[i].devices.handles[j],
1109 &power_state);
1110 if (result || (power_state != ACPI_STATE_D0)) {
1111 tz->trips.active[i].flags.enabled = 0;
1112 break;
1113 }
1114 }
1115 tz->state.active |= tz->trips.active[i].flags.enabled;
1116 }
1117
1118 acpi_queue_thermal_check(tz);
1119
1120 return AE_OK;
1121 }
1122 #endif
1123
thermal_act(const struct dmi_system_id * d)1124 static int thermal_act(const struct dmi_system_id *d) {
1125
1126 if (act == 0) {
1127 pr_notice("%s detected: disabling all active thermal trip points\n",
1128 d->ident);
1129 act = -1;
1130 }
1131 return 0;
1132 }
thermal_nocrt(const struct dmi_system_id * d)1133 static int thermal_nocrt(const struct dmi_system_id *d) {
1134
1135 pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
1136 d->ident);
1137 nocrt = 1;
1138 return 0;
1139 }
thermal_tzp(const struct dmi_system_id * d)1140 static int thermal_tzp(const struct dmi_system_id *d) {
1141
1142 if (tzp == 0) {
1143 pr_notice("%s detected: enabling thermal zone polling\n",
1144 d->ident);
1145 tzp = 300; /* 300 dS = 30 Seconds */
1146 }
1147 return 0;
1148 }
thermal_psv(const struct dmi_system_id * d)1149 static int thermal_psv(const struct dmi_system_id *d) {
1150
1151 if (psv == 0) {
1152 pr_notice("%s detected: disabling all passive thermal trip points\n",
1153 d->ident);
1154 psv = -1;
1155 }
1156 return 0;
1157 }
1158
1159 static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1160 /*
1161 * Award BIOS on this AOpen makes thermal control almost worthless.
1162 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1163 */
1164 {
1165 .callback = thermal_act,
1166 .ident = "AOpen i915GMm-HFS",
1167 .matches = {
1168 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1169 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1170 },
1171 },
1172 {
1173 .callback = thermal_psv,
1174 .ident = "AOpen i915GMm-HFS",
1175 .matches = {
1176 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1177 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1178 },
1179 },
1180 {
1181 .callback = thermal_tzp,
1182 .ident = "AOpen i915GMm-HFS",
1183 .matches = {
1184 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1185 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1186 },
1187 },
1188 {
1189 .callback = thermal_nocrt,
1190 .ident = "Gigabyte GA-7ZX",
1191 .matches = {
1192 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1193 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1194 },
1195 },
1196 {}
1197 };
1198
acpi_thermal_init(void)1199 static int __init acpi_thermal_init(void)
1200 {
1201 int result = 0;
1202
1203 dmi_check_system(thermal_dmi_table);
1204
1205 if (off) {
1206 pr_notice("thermal control disabled\n");
1207 return -ENODEV;
1208 }
1209
1210 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1211 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1212 if (!acpi_thermal_pm_queue)
1213 return -ENODEV;
1214
1215 result = acpi_bus_register_driver(&acpi_thermal_driver);
1216 if (result < 0) {
1217 destroy_workqueue(acpi_thermal_pm_queue);
1218 return -ENODEV;
1219 }
1220
1221 return 0;
1222 }
1223
acpi_thermal_exit(void)1224 static void __exit acpi_thermal_exit(void)
1225 {
1226 acpi_bus_unregister_driver(&acpi_thermal_driver);
1227 destroy_workqueue(acpi_thermal_pm_queue);
1228
1229 return;
1230 }
1231
1232 module_init(acpi_thermal_init);
1233 module_exit(acpi_thermal_exit);
1234