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1/*
2 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 *
25 * This driver fully implements the ACPI thermal policy as described in the
26 * ACPI 2.0 Specification.
27 *
28 * TBD: 1. Implement passive cooling hysteresis.
29 * 2. Enhance passive cooling (CPU) states/limit interface to support
30 * concepts of 'multiple limiters', upper/lower limits, etc.
31 *
32 */
33
34#include <linux/kernel.h>
35#include <linux/module.h>
36#include <linux/dmi.h>
37#include <linux/init.h>
38#include <linux/slab.h>
39#include <linux/types.h>
40#include <linux/jiffies.h>
41#include <linux/kmod.h>
42#include <linux/reboot.h>
43#include <linux/device.h>
44#include <asm/uaccess.h>
45#include <linux/thermal.h>
46#include <acpi/acpi_bus.h>
47#include <acpi/acpi_drivers.h>
48
49#define PREFIX "ACPI: "
50
51#define ACPI_THERMAL_CLASS "thermal_zone"
52#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
53#define ACPI_THERMAL_FILE_STATE "state"
54#define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
55#define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
56#define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
57#define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
58#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
59#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
60#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
61#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
62#define ACPI_THERMAL_NOTIFY_HOT 0xF1
63#define ACPI_THERMAL_MODE_ACTIVE 0x00
64
65#define ACPI_THERMAL_MAX_ACTIVE 10
66#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
67
68#define _COMPONENT ACPI_THERMAL_COMPONENT
69ACPI_MODULE_NAME("thermal");
70
71MODULE_AUTHOR("Paul Diefenbaugh");
72MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
73MODULE_LICENSE("GPL");
74
75static int act;
76module_param(act, int, 0644);
77MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
78
79static int crt;
80module_param(crt, int, 0644);
81MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
82
83static int tzp;
84module_param(tzp, int, 0444);
85MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
86
87static int nocrt;
88module_param(nocrt, int, 0);
89MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
90
91static int off;
92module_param(off, int, 0);
93MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
94
95static int psv;
96module_param(psv, int, 0644);
97MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
98
99static int acpi_thermal_add(struct acpi_device *device);
100static int acpi_thermal_remove(struct acpi_device *device, int type);
101static int acpi_thermal_resume(struct acpi_device *device);
102static void acpi_thermal_notify(struct acpi_device *device, u32 event);
103
104static const struct acpi_device_id thermal_device_ids[] = {
105 {ACPI_THERMAL_HID, 0},
106 {"", 0},
107};
108MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
109
110static struct acpi_driver acpi_thermal_driver = {
111 .name = "thermal",
112 .class = ACPI_THERMAL_CLASS,
113 .ids = thermal_device_ids,
114 .ops = {
115 .add = acpi_thermal_add,
116 .remove = acpi_thermal_remove,
117 .resume = acpi_thermal_resume,
118 .notify = acpi_thermal_notify,
119 },
120};
121
122struct acpi_thermal_state {
123 u8 critical:1;
124 u8 hot:1;
125 u8 passive:1;
126 u8 active:1;
127 u8 reserved:4;
128 int active_index;
129};
130
131struct acpi_thermal_state_flags {
132 u8 valid:1;
133 u8 enabled:1;
134 u8 reserved:6;
135};
136
137struct acpi_thermal_critical {
138 struct acpi_thermal_state_flags flags;
139 unsigned long temperature;
140};
141
142struct acpi_thermal_hot {
143 struct acpi_thermal_state_flags flags;
144 unsigned long temperature;
145};
146
147struct acpi_thermal_passive {
148 struct acpi_thermal_state_flags flags;
149 unsigned long temperature;
150 unsigned long tc1;
151 unsigned long tc2;
152 unsigned long tsp;
153 struct acpi_handle_list devices;
154};
155
156struct acpi_thermal_active {
157 struct acpi_thermal_state_flags flags;
158 unsigned long temperature;
159 struct acpi_handle_list devices;
160};
161
162struct acpi_thermal_trips {
163 struct acpi_thermal_critical critical;
164 struct acpi_thermal_hot hot;
165 struct acpi_thermal_passive passive;
166 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
167};
168
169struct acpi_thermal_flags {
170 u8 cooling_mode:1; /* _SCP */
171 u8 devices:1; /* _TZD */
172 u8 reserved:6;
173};
174
175struct acpi_thermal {
176 struct acpi_device * device;
177 acpi_bus_id name;
178 unsigned long temperature;
179 unsigned long last_temperature;
180 unsigned long polling_frequency;
181 volatile u8 zombie;
182 struct acpi_thermal_flags flags;
183 struct acpi_thermal_state state;
184 struct acpi_thermal_trips trips;
185 struct acpi_handle_list devices;
186 struct thermal_zone_device *thermal_zone;
187 int tz_enabled;
188 int kelvin_offset;
189 struct mutex lock;
190};
191
192/* --------------------------------------------------------------------------
193 Thermal Zone Management
194 -------------------------------------------------------------------------- */
195
196static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
197{
198 acpi_status status = AE_OK;
199 unsigned long long tmp;
200
201 if (!tz)
202 return -EINVAL;
203
204 tz->last_temperature = tz->temperature;
205
206 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
207 if (ACPI_FAILURE(status))
208 return -ENODEV;
209
210 tz->temperature = tmp;
211 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
212 tz->temperature));
213
214 return 0;
215}
216
217static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
218{
219 acpi_status status = AE_OK;
220 unsigned long long tmp;
221
222 if (!tz)
223 return -EINVAL;
224
225 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
226 if (ACPI_FAILURE(status))
227 return -ENODEV;
228
229 tz->polling_frequency = tmp;
230 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
231 tz->polling_frequency));
232
233 return 0;
234}
235
236static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
237{
238 acpi_status status = AE_OK;
239 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
240 struct acpi_object_list arg_list = { 1, &arg0 };
241 acpi_handle handle = NULL;
242
243
244 if (!tz)
245 return -EINVAL;
246
247 status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
248 if (ACPI_FAILURE(status)) {
249 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
250 return -ENODEV;
251 }
252
253 arg0.integer.value = mode;
254
255 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
256 if (ACPI_FAILURE(status))
257 return -ENODEV;
258
259 return 0;
260}
261
262#define ACPI_TRIPS_CRITICAL 0x01
263#define ACPI_TRIPS_HOT 0x02
264#define ACPI_TRIPS_PASSIVE 0x04
265#define ACPI_TRIPS_ACTIVE 0x08
266#define ACPI_TRIPS_DEVICES 0x10
267
268#define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
269#define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
270
271#define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
272 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
273 ACPI_TRIPS_DEVICES)
274
275/*
276 * This exception is thrown out in two cases:
277 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
278 * when re-evaluating the AML code.
279 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
280 * We need to re-bind the cooling devices of a thermal zone when this occurs.
281 */
282#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
283do { \
284 if (flags != ACPI_TRIPS_INIT) \
285 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
286 "ACPI thermal trip point %s changed\n" \
287 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
288} while (0)
289
290static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
291{
292 acpi_status status = AE_OK;
293 unsigned long long tmp;
294 struct acpi_handle_list devices;
295 int valid = 0;
296 int i;
297
298 /* Critical Shutdown */
299 if (flag & ACPI_TRIPS_CRITICAL) {
300 status = acpi_evaluate_integer(tz->device->handle,
301 "_CRT", NULL, &tmp);
302 tz->trips.critical.temperature = tmp;
303 /*
304 * Treat freezing temperatures as invalid as well; some
305 * BIOSes return really low values and cause reboots at startup.
306 * Below zero (Celsius) values clearly aren't right for sure..
307 * ... so lets discard those as invalid.
308 */
309 if (ACPI_FAILURE(status)) {
310 tz->trips.critical.flags.valid = 0;
311 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
312 "No critical threshold\n"));
313 } else if (tmp <= 2732) {
314 printk(KERN_WARNING FW_BUG "Invalid critical threshold "
315 "(%llu)\n", tmp);
316 tz->trips.critical.flags.valid = 0;
317 } else {
318 tz->trips.critical.flags.valid = 1;
319 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
320 "Found critical threshold [%lu]\n",
321 tz->trips.critical.temperature));
322 }
323 if (tz->trips.critical.flags.valid == 1) {
324 if (crt == -1) {
325 tz->trips.critical.flags.valid = 0;
326 } else if (crt > 0) {
327 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
328 /*
329 * Allow override critical threshold
330 */
331 if (crt_k > tz->trips.critical.temperature)
332 printk(KERN_WARNING PREFIX
333 "Critical threshold %d C\n", crt);
334 tz->trips.critical.temperature = crt_k;
335 }
336 }
337 }
338
339 /* Critical Sleep (optional) */
340 if (flag & ACPI_TRIPS_HOT) {
341 status = acpi_evaluate_integer(tz->device->handle,
342 "_HOT", NULL, &tmp);
343 if (ACPI_FAILURE(status)) {
344 tz->trips.hot.flags.valid = 0;
345 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
346 "No hot threshold\n"));
347 } else {
348 tz->trips.hot.temperature = tmp;
349 tz->trips.hot.flags.valid = 1;
350 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
351 "Found hot threshold [%lu]\n",
352 tz->trips.critical.temperature));
353 }
354 }
355
356 /* Passive (optional) */
357 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
358 (flag == ACPI_TRIPS_INIT)) {
359 valid = tz->trips.passive.flags.valid;
360 if (psv == -1) {
361 status = AE_SUPPORT;
362 } else if (psv > 0) {
363 tmp = CELSIUS_TO_KELVIN(psv);
364 status = AE_OK;
365 } else {
366 status = acpi_evaluate_integer(tz->device->handle,
367 "_PSV", NULL, &tmp);
368 }
369
370 if (ACPI_FAILURE(status))
371 tz->trips.passive.flags.valid = 0;
372 else {
373 tz->trips.passive.temperature = tmp;
374 tz->trips.passive.flags.valid = 1;
375 if (flag == ACPI_TRIPS_INIT) {
376 status = acpi_evaluate_integer(
377 tz->device->handle, "_TC1",
378 NULL, &tmp);
379 if (ACPI_FAILURE(status))
380 tz->trips.passive.flags.valid = 0;
381 else
382 tz->trips.passive.tc1 = tmp;
383 status = acpi_evaluate_integer(
384 tz->device->handle, "_TC2",
385 NULL, &tmp);
386 if (ACPI_FAILURE(status))
387 tz->trips.passive.flags.valid = 0;
388 else
389 tz->trips.passive.tc2 = tmp;
390 status = acpi_evaluate_integer(
391 tz->device->handle, "_TSP",
392 NULL, &tmp);
393 if (ACPI_FAILURE(status))
394 tz->trips.passive.flags.valid = 0;
395 else
396 tz->trips.passive.tsp = tmp;
397 }
398 }
399 }
400 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
401 memset(&devices, 0, sizeof(struct acpi_handle_list));
402 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
403 NULL, &devices);
404 if (ACPI_FAILURE(status)) {
405 printk(KERN_WARNING PREFIX
406 "Invalid passive threshold\n");
407 tz->trips.passive.flags.valid = 0;
408 }
409 else
410 tz->trips.passive.flags.valid = 1;
411
412 if (memcmp(&tz->trips.passive.devices, &devices,
413 sizeof(struct acpi_handle_list))) {
414 memcpy(&tz->trips.passive.devices, &devices,
415 sizeof(struct acpi_handle_list));
416 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
417 }
418 }
419 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
420 if (valid != tz->trips.passive.flags.valid)
421 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
422 }
423
424 /* Active (optional) */
425 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
426 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
427 valid = tz->trips.active[i].flags.valid;
428
429 if (act == -1)
430 break; /* disable all active trip points */
431
432 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
433 tz->trips.active[i].flags.valid)) {
434 status = acpi_evaluate_integer(tz->device->handle,
435 name, NULL, &tmp);
436 if (ACPI_FAILURE(status)) {
437 tz->trips.active[i].flags.valid = 0;
438 if (i == 0)
439 break;
440 if (act <= 0)
441 break;
442 if (i == 1)
443 tz->trips.active[0].temperature =
444 CELSIUS_TO_KELVIN(act);
445 else
446 /*
447 * Don't allow override higher than
448 * the next higher trip point
449 */
450 tz->trips.active[i - 1].temperature =
451 (tz->trips.active[i - 2].temperature <
452 CELSIUS_TO_KELVIN(act) ?
453 tz->trips.active[i - 2].temperature :
454 CELSIUS_TO_KELVIN(act));
455 break;
456 } else {
457 tz->trips.active[i].temperature = tmp;
458 tz->trips.active[i].flags.valid = 1;
459 }
460 }
461
462 name[2] = 'L';
463 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
464 memset(&devices, 0, sizeof(struct acpi_handle_list));
465 status = acpi_evaluate_reference(tz->device->handle,
466 name, NULL, &devices);
467 if (ACPI_FAILURE(status)) {
468 printk(KERN_WARNING PREFIX
469 "Invalid active%d threshold\n", i);
470 tz->trips.active[i].flags.valid = 0;
471 }
472 else
473 tz->trips.active[i].flags.valid = 1;
474
475 if (memcmp(&tz->trips.active[i].devices, &devices,
476 sizeof(struct acpi_handle_list))) {
477 memcpy(&tz->trips.active[i].devices, &devices,
478 sizeof(struct acpi_handle_list));
479 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
480 }
481 }
482 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
483 if (valid != tz->trips.active[i].flags.valid)
484 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
485
486 if (!tz->trips.active[i].flags.valid)
487 break;
488 }
489
490 if (flag & ACPI_TRIPS_DEVICES) {
491 memset(&devices, 0, sizeof(struct acpi_handle_list));
492 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
493 NULL, &devices);
494 if (memcmp(&tz->devices, &devices,
495 sizeof(struct acpi_handle_list))) {
496 memcpy(&tz->devices, &devices,
497 sizeof(struct acpi_handle_list));
498 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
499 }
500 }
501
502 return 0;
503}
504
505static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
506{
507 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
508
509 if (ret)
510 return ret;
511
512 valid = tz->trips.critical.flags.valid |
513 tz->trips.hot.flags.valid |
514 tz->trips.passive.flags.valid;
515
516 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
517 valid |= tz->trips.active[i].flags.valid;
518
519 if (!valid) {
520 printk(KERN_WARNING FW_BUG "No valid trip found\n");
521 return -ENODEV;
522 }
523 return 0;
524}
525
526static void acpi_thermal_check(void *data)
527{
528 struct acpi_thermal *tz = data;
529
530 thermal_zone_device_update(tz->thermal_zone);
531}
532
533/* sys I/F for generic thermal sysfs support */
534#define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
535
536static int thermal_get_temp(struct thermal_zone_device *thermal,
537 unsigned long *temp)
538{
539 struct acpi_thermal *tz = thermal->devdata;
540 int result;
541
542 if (!tz)
543 return -EINVAL;
544
545 result = acpi_thermal_get_temperature(tz);
546 if (result)
547 return result;
548
549 *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
550 return 0;
551}
552
553static const char enabled[] = "kernel";
554static const char disabled[] = "user";
555static int thermal_get_mode(struct thermal_zone_device *thermal,
556 enum thermal_device_mode *mode)
557{
558 struct acpi_thermal *tz = thermal->devdata;
559
560 if (!tz)
561 return -EINVAL;
562
563 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
564 THERMAL_DEVICE_DISABLED;
565
566 return 0;
567}
568
569static int thermal_set_mode(struct thermal_zone_device *thermal,
570 enum thermal_device_mode mode)
571{
572 struct acpi_thermal *tz = thermal->devdata;
573 int enable;
574
575 if (!tz)
576 return -EINVAL;
577
578 /*
579 * enable/disable thermal management from ACPI thermal driver
580 */
581 if (mode == THERMAL_DEVICE_ENABLED)
582 enable = 1;
583 else if (mode == THERMAL_DEVICE_DISABLED)
584 enable = 0;
585 else
586 return -EINVAL;
587
588 if (enable != tz->tz_enabled) {
589 tz->tz_enabled = enable;
590 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
591 "%s ACPI thermal control\n",
592 tz->tz_enabled ? enabled : disabled));
593 acpi_thermal_check(tz);
594 }
595 return 0;
596}
597
598static int thermal_get_trip_type(struct thermal_zone_device *thermal,
599 int trip, enum thermal_trip_type *type)
600{
601 struct acpi_thermal *tz = thermal->devdata;
602 int i;
603
604 if (!tz || trip < 0)
605 return -EINVAL;
606
607 if (tz->trips.critical.flags.valid) {
608 if (!trip) {
609 *type = THERMAL_TRIP_CRITICAL;
610 return 0;
611 }
612 trip--;
613 }
614
615 if (tz->trips.hot.flags.valid) {
616 if (!trip) {
617 *type = THERMAL_TRIP_HOT;
618 return 0;
619 }
620 trip--;
621 }
622
623 if (tz->trips.passive.flags.valid) {
624 if (!trip) {
625 *type = THERMAL_TRIP_PASSIVE;
626 return 0;
627 }
628 trip--;
629 }
630
631 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
632 tz->trips.active[i].flags.valid; i++) {
633 if (!trip) {
634 *type = THERMAL_TRIP_ACTIVE;
635 return 0;
636 }
637 trip--;
638 }
639
640 return -EINVAL;
641}
642
643static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
644 int trip, unsigned long *temp)
645{
646 struct acpi_thermal *tz = thermal->devdata;
647 int i;
648
649 if (!tz || trip < 0)
650 return -EINVAL;
651
652 if (tz->trips.critical.flags.valid) {
653 if (!trip) {
654 *temp = KELVIN_TO_MILLICELSIUS(
655 tz->trips.critical.temperature,
656 tz->kelvin_offset);
657 return 0;
658 }
659 trip--;
660 }
661
662 if (tz->trips.hot.flags.valid) {
663 if (!trip) {
664 *temp = KELVIN_TO_MILLICELSIUS(
665 tz->trips.hot.temperature,
666 tz->kelvin_offset);
667 return 0;
668 }
669 trip--;
670 }
671
672 if (tz->trips.passive.flags.valid) {
673 if (!trip) {
674 *temp = KELVIN_TO_MILLICELSIUS(
675 tz->trips.passive.temperature,
676 tz->kelvin_offset);
677 return 0;
678 }
679 trip--;
680 }
681
682 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
683 tz->trips.active[i].flags.valid; i++) {
684 if (!trip) {
685 *temp = KELVIN_TO_MILLICELSIUS(
686 tz->trips.active[i].temperature,
687 tz->kelvin_offset);
688 return 0;
689 }
690 trip--;
691 }
692
693 return -EINVAL;
694}
695
696static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
697 unsigned long *temperature) {
698 struct acpi_thermal *tz = thermal->devdata;
699
700 if (tz->trips.critical.flags.valid) {
701 *temperature = KELVIN_TO_MILLICELSIUS(
702 tz->trips.critical.temperature,
703 tz->kelvin_offset);
704 return 0;
705 } else
706 return -EINVAL;
707}
708
709static int thermal_notify(struct thermal_zone_device *thermal, int trip,
710 enum thermal_trip_type trip_type)
711{
712 u8 type = 0;
713 struct acpi_thermal *tz = thermal->devdata;
714
715 if (trip_type == THERMAL_TRIP_CRITICAL)
716 type = ACPI_THERMAL_NOTIFY_CRITICAL;
717 else if (trip_type == THERMAL_TRIP_HOT)
718 type = ACPI_THERMAL_NOTIFY_HOT;
719 else
720 return 0;
721
722 acpi_bus_generate_proc_event(tz->device, type, 1);
723 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
724 dev_name(&tz->device->dev), type, 1);
725
726 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
727 return 1;
728
729 return 0;
730}
731
732typedef int (*cb)(struct thermal_zone_device *, int,
733 struct thermal_cooling_device *);
734static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
735 struct thermal_cooling_device *cdev,
736 cb action)
737{
738 struct acpi_device *device = cdev->devdata;
739 struct acpi_thermal *tz = thermal->devdata;
740 struct acpi_device *dev;
741 acpi_status status;
742 acpi_handle handle;
743 int i;
744 int j;
745 int trip = -1;
746 int result = 0;
747
748 if (tz->trips.critical.flags.valid)
749 trip++;
750
751 if (tz->trips.hot.flags.valid)
752 trip++;
753
754 if (tz->trips.passive.flags.valid) {
755 trip++;
756 for (i = 0; i < tz->trips.passive.devices.count;
757 i++) {
758 handle = tz->trips.passive.devices.handles[i];
759 status = acpi_bus_get_device(handle, &dev);
760 if (ACPI_SUCCESS(status) && (dev == device)) {
761 result = action(thermal, trip, cdev);
762 if (result)
763 goto failed;
764 }
765 }
766 }
767
768 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
769 if (!tz->trips.active[i].flags.valid)
770 break;
771 trip++;
772 for (j = 0;
773 j < tz->trips.active[i].devices.count;
774 j++) {
775 handle = tz->trips.active[i].devices.handles[j];
776 status = acpi_bus_get_device(handle, &dev);
777 if (ACPI_SUCCESS(status) && (dev == device)) {
778 result = action(thermal, trip, cdev);
779 if (result)
780 goto failed;
781 }
782 }
783 }
784
785 for (i = 0; i < tz->devices.count; i++) {
786 handle = tz->devices.handles[i];
787 status = acpi_bus_get_device(handle, &dev);
788 if (ACPI_SUCCESS(status) && (dev == device)) {
789 result = action(thermal, -1, cdev);
790 if (result)
791 goto failed;
792 }
793 }
794
795failed:
796 return result;
797}
798
799static int
800acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
801 struct thermal_cooling_device *cdev)
802{
803 return acpi_thermal_cooling_device_cb(thermal, cdev,
804 thermal_zone_bind_cooling_device);
805}
806
807static int
808acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
809 struct thermal_cooling_device *cdev)
810{
811 return acpi_thermal_cooling_device_cb(thermal, cdev,
812 thermal_zone_unbind_cooling_device);
813}
814
815static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
816 .bind = acpi_thermal_bind_cooling_device,
817 .unbind = acpi_thermal_unbind_cooling_device,
818 .get_temp = thermal_get_temp,
819 .get_mode = thermal_get_mode,
820 .set_mode = thermal_set_mode,
821 .get_trip_type = thermal_get_trip_type,
822 .get_trip_temp = thermal_get_trip_temp,
823 .get_crit_temp = thermal_get_crit_temp,
824 .notify = thermal_notify,
825};
826
827static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
828{
829 int trips = 0;
830 int result;
831 acpi_status status;
832 int i;
833
834 if (tz->trips.critical.flags.valid)
835 trips++;
836
837 if (tz->trips.hot.flags.valid)
838 trips++;
839
840 if (tz->trips.passive.flags.valid)
841 trips++;
842
843 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
844 tz->trips.active[i].flags.valid; i++, trips++);
845
846 if (tz->trips.passive.flags.valid)
847 tz->thermal_zone =
848 thermal_zone_device_register("acpitz", trips, tz,
849 &acpi_thermal_zone_ops,
850 tz->trips.passive.tc1,
851 tz->trips.passive.tc2,
852 tz->trips.passive.tsp*100,
853 tz->polling_frequency*100);
854 else
855 tz->thermal_zone =
856 thermal_zone_device_register("acpitz", trips, tz,
857 &acpi_thermal_zone_ops,
858 0, 0, 0,
859 tz->polling_frequency*100);
860 if (IS_ERR(tz->thermal_zone))
861 return -ENODEV;
862
863 result = sysfs_create_link(&tz->device->dev.kobj,
864 &tz->thermal_zone->device.kobj, "thermal_zone");
865 if (result)
866 return result;
867
868 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
869 &tz->device->dev.kobj, "device");
870 if (result)
871 return result;
872
873 status = acpi_attach_data(tz->device->handle,
874 acpi_bus_private_data_handler,
875 tz->thermal_zone);
876 if (ACPI_FAILURE(status)) {
877 printk(KERN_ERR PREFIX
878 "Error attaching device data\n");
879 return -ENODEV;
880 }
881
882 tz->tz_enabled = 1;
883
884 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
885 tz->thermal_zone->id);
886 return 0;
887}
888
889static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
890{
891 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
892 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
893 thermal_zone_device_unregister(tz->thermal_zone);
894 tz->thermal_zone = NULL;
895 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
896}
897
898
899/* --------------------------------------------------------------------------
900 Driver Interface
901 -------------------------------------------------------------------------- */
902
903static void acpi_thermal_notify(struct acpi_device *device, u32 event)
904{
905 struct acpi_thermal *tz = acpi_driver_data(device);
906
907
908 if (!tz)
909 return;
910
911 switch (event) {
912 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
913 acpi_thermal_check(tz);
914 break;
915 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
916 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
917 acpi_thermal_check(tz);
918 acpi_bus_generate_proc_event(device, event, 0);
919 acpi_bus_generate_netlink_event(device->pnp.device_class,
920 dev_name(&device->dev), event, 0);
921 break;
922 case ACPI_THERMAL_NOTIFY_DEVICES:
923 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
924 acpi_thermal_check(tz);
925 acpi_bus_generate_proc_event(device, event, 0);
926 acpi_bus_generate_netlink_event(device->pnp.device_class,
927 dev_name(&device->dev), event, 0);
928 break;
929 default:
930 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
931 "Unsupported event [0x%x]\n", event));
932 break;
933 }
934}
935
936static int acpi_thermal_get_info(struct acpi_thermal *tz)
937{
938 int result = 0;
939
940
941 if (!tz)
942 return -EINVAL;
943
944 /* Get temperature [_TMP] (required) */
945 result = acpi_thermal_get_temperature(tz);
946 if (result)
947 return result;
948
949 /* Get trip points [_CRT, _PSV, etc.] (required) */
950 result = acpi_thermal_get_trip_points(tz);
951 if (result)
952 return result;
953
954 /* Set the cooling mode [_SCP] to active cooling (default) */
955 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
956 if (!result)
957 tz->flags.cooling_mode = 1;
958
959 /* Get default polling frequency [_TZP] (optional) */
960 if (tzp)
961 tz->polling_frequency = tzp;
962 else
963 acpi_thermal_get_polling_frequency(tz);
964
965 return 0;
966}
967
968/*
969 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
970 * handles temperature values with a single decimal place. As a consequence,
971 * some implementations use an offset of 273.1 and others use an offset of
972 * 273.2. Try to find out which one is being used, to present the most
973 * accurate and visually appealing number.
974 *
975 * The heuristic below should work for all ACPI thermal zones which have a
976 * critical trip point with a value being a multiple of 0.5 degree Celsius.
977 */
978static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
979{
980 if (tz->trips.critical.flags.valid &&
981 (tz->trips.critical.temperature % 5) == 1)
982 tz->kelvin_offset = 2731;
983 else
984 tz->kelvin_offset = 2732;
985}
986
987static int acpi_thermal_add(struct acpi_device *device)
988{
989 int result = 0;
990 struct acpi_thermal *tz = NULL;
991
992
993 if (!device)
994 return -EINVAL;
995
996 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
997 if (!tz)
998 return -ENOMEM;
999
1000 tz->device = device;
1001 strcpy(tz->name, device->pnp.bus_id);
1002 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1003 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1004 device->driver_data = tz;
1005 mutex_init(&tz->lock);
1006
1007
1008 result = acpi_thermal_get_info(tz);
1009 if (result)
1010 goto free_memory;
1011
1012 acpi_thermal_guess_offset(tz);
1013
1014 result = acpi_thermal_register_thermal_zone(tz);
1015 if (result)
1016 goto free_memory;
1017
1018 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1019 acpi_device_name(device), acpi_device_bid(device),
1020 KELVIN_TO_CELSIUS(tz->temperature));
1021 goto end;
1022
1023free_memory:
1024 kfree(tz);
1025end:
1026 return result;
1027}
1028
1029static int acpi_thermal_remove(struct acpi_device *device, int type)
1030{
1031 struct acpi_thermal *tz = NULL;
1032
1033 if (!device || !acpi_driver_data(device))
1034 return -EINVAL;
1035
1036 tz = acpi_driver_data(device);
1037
1038 acpi_thermal_unregister_thermal_zone(tz);
1039 mutex_destroy(&tz->lock);
1040 kfree(tz);
1041 return 0;
1042}
1043
1044static int acpi_thermal_resume(struct acpi_device *device)
1045{
1046 struct acpi_thermal *tz = NULL;
1047 int i, j, power_state, result;
1048
1049
1050 if (!device || !acpi_driver_data(device))
1051 return -EINVAL;
1052
1053 tz = acpi_driver_data(device);
1054
1055 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1056 if (!(&tz->trips.active[i]))
1057 break;
1058 if (!tz->trips.active[i].flags.valid)
1059 break;
1060 tz->trips.active[i].flags.enabled = 1;
1061 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1062 result = acpi_bus_update_power(
1063 tz->trips.active[i].devices.handles[j],
1064 &power_state);
1065 if (result || (power_state != ACPI_STATE_D0)) {
1066 tz->trips.active[i].flags.enabled = 0;
1067 break;
1068 }
1069 }
1070 tz->state.active |= tz->trips.active[i].flags.enabled;
1071 }
1072
1073 acpi_thermal_check(tz);
1074
1075 return AE_OK;
1076}
1077
1078static int thermal_act(const struct dmi_system_id *d) {
1079
1080 if (act == 0) {
1081 printk(KERN_NOTICE "ACPI: %s detected: "
1082 "disabling all active thermal trip points\n", d->ident);
1083 act = -1;
1084 }
1085 return 0;
1086}
1087static int thermal_nocrt(const struct dmi_system_id *d) {
1088
1089 printk(KERN_NOTICE "ACPI: %s detected: "
1090 "disabling all critical thermal trip point actions.\n", d->ident);
1091 nocrt = 1;
1092 return 0;
1093}
1094static int thermal_tzp(const struct dmi_system_id *d) {
1095
1096 if (tzp == 0) {
1097 printk(KERN_NOTICE "ACPI: %s detected: "
1098 "enabling thermal zone polling\n", d->ident);
1099 tzp = 300; /* 300 dS = 30 Seconds */
1100 }
1101 return 0;
1102}
1103static int thermal_psv(const struct dmi_system_id *d) {
1104
1105 if (psv == 0) {
1106 printk(KERN_NOTICE "ACPI: %s detected: "
1107 "disabling all passive thermal trip points\n", d->ident);
1108 psv = -1;
1109 }
1110 return 0;
1111}
1112
1113static struct dmi_system_id thermal_dmi_table[] __initdata = {
1114 /*
1115 * Award BIOS on this AOpen makes thermal control almost worthless.
1116 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1117 */
1118 {
1119 .callback = thermal_act,
1120 .ident = "AOpen i915GMm-HFS",
1121 .matches = {
1122 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1123 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1124 },
1125 },
1126 {
1127 .callback = thermal_psv,
1128 .ident = "AOpen i915GMm-HFS",
1129 .matches = {
1130 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1131 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1132 },
1133 },
1134 {
1135 .callback = thermal_tzp,
1136 .ident = "AOpen i915GMm-HFS",
1137 .matches = {
1138 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1139 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1140 },
1141 },
1142 {
1143 .callback = thermal_nocrt,
1144 .ident = "Gigabyte GA-7ZX",
1145 .matches = {
1146 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1147 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1148 },
1149 },
1150 {}
1151};
1152
1153static int __init acpi_thermal_init(void)
1154{
1155 int result = 0;
1156
1157 dmi_check_system(thermal_dmi_table);
1158
1159 if (off) {
1160 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1161 return -ENODEV;
1162 }
1163
1164 result = acpi_bus_register_driver(&acpi_thermal_driver);
1165 if (result < 0)
1166 return -ENODEV;
1167
1168 return 0;
1169}
1170
1171static void __exit acpi_thermal_exit(void)
1172{
1173
1174 acpi_bus_unregister_driver(&acpi_thermal_driver);
1175
1176 return;
1177}
1178
1179module_init(acpi_thermal_init);
1180module_exit(acpi_thermal_exit);
1/*
2 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 *
25 * This driver fully implements the ACPI thermal policy as described in the
26 * ACPI 2.0 Specification.
27 *
28 * TBD: 1. Implement passive cooling hysteresis.
29 * 2. Enhance passive cooling (CPU) states/limit interface to support
30 * concepts of 'multiple limiters', upper/lower limits, etc.
31 *
32 */
33
34#include <linux/kernel.h>
35#include <linux/module.h>
36#include <linux/dmi.h>
37#include <linux/init.h>
38#include <linux/slab.h>
39#include <linux/types.h>
40#include <linux/jiffies.h>
41#include <linux/kmod.h>
42#include <linux/reboot.h>
43#include <linux/device.h>
44#include <linux/thermal.h>
45#include <linux/acpi.h>
46#include <linux/workqueue.h>
47#include <asm/uaccess.h>
48
49#define PREFIX "ACPI: "
50
51#define ACPI_THERMAL_CLASS "thermal_zone"
52#define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
53#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
54#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
55#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
56#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
57#define ACPI_THERMAL_NOTIFY_HOT 0xF1
58#define ACPI_THERMAL_MODE_ACTIVE 0x00
59
60#define ACPI_THERMAL_MAX_ACTIVE 10
61#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
62
63#define _COMPONENT ACPI_THERMAL_COMPONENT
64ACPI_MODULE_NAME("thermal");
65
66MODULE_AUTHOR("Paul Diefenbaugh");
67MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
68MODULE_LICENSE("GPL");
69
70static int act;
71module_param(act, int, 0644);
72MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
73
74static int crt;
75module_param(crt, int, 0644);
76MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
77
78static int tzp;
79module_param(tzp, int, 0444);
80MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
81
82static int nocrt;
83module_param(nocrt, int, 0);
84MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
85
86static int off;
87module_param(off, int, 0);
88MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
89
90static int psv;
91module_param(psv, int, 0644);
92MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
93
94static struct workqueue_struct *acpi_thermal_pm_queue;
95
96static int acpi_thermal_add(struct acpi_device *device);
97static int acpi_thermal_remove(struct acpi_device *device);
98static void acpi_thermal_notify(struct acpi_device *device, u32 event);
99
100static const struct acpi_device_id thermal_device_ids[] = {
101 {ACPI_THERMAL_HID, 0},
102 {"", 0},
103};
104MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
105
106#ifdef CONFIG_PM_SLEEP
107static int acpi_thermal_suspend(struct device *dev);
108static int acpi_thermal_resume(struct device *dev);
109#else
110#define acpi_thermal_suspend NULL
111#define acpi_thermal_resume NULL
112#endif
113static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
114
115static struct acpi_driver acpi_thermal_driver = {
116 .name = "thermal",
117 .class = ACPI_THERMAL_CLASS,
118 .ids = thermal_device_ids,
119 .ops = {
120 .add = acpi_thermal_add,
121 .remove = acpi_thermal_remove,
122 .notify = acpi_thermal_notify,
123 },
124 .drv.pm = &acpi_thermal_pm,
125};
126
127struct acpi_thermal_state {
128 u8 critical:1;
129 u8 hot:1;
130 u8 passive:1;
131 u8 active:1;
132 u8 reserved:4;
133 int active_index;
134};
135
136struct acpi_thermal_state_flags {
137 u8 valid:1;
138 u8 enabled:1;
139 u8 reserved:6;
140};
141
142struct acpi_thermal_critical {
143 struct acpi_thermal_state_flags flags;
144 unsigned long temperature;
145};
146
147struct acpi_thermal_hot {
148 struct acpi_thermal_state_flags flags;
149 unsigned long temperature;
150};
151
152struct acpi_thermal_passive {
153 struct acpi_thermal_state_flags flags;
154 unsigned long temperature;
155 unsigned long tc1;
156 unsigned long tc2;
157 unsigned long tsp;
158 struct acpi_handle_list devices;
159};
160
161struct acpi_thermal_active {
162 struct acpi_thermal_state_flags flags;
163 unsigned long temperature;
164 struct acpi_handle_list devices;
165};
166
167struct acpi_thermal_trips {
168 struct acpi_thermal_critical critical;
169 struct acpi_thermal_hot hot;
170 struct acpi_thermal_passive passive;
171 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
172};
173
174struct acpi_thermal_flags {
175 u8 cooling_mode:1; /* _SCP */
176 u8 devices:1; /* _TZD */
177 u8 reserved:6;
178};
179
180struct acpi_thermal {
181 struct acpi_device * device;
182 acpi_bus_id name;
183 unsigned long temperature;
184 unsigned long last_temperature;
185 unsigned long polling_frequency;
186 volatile u8 zombie;
187 struct acpi_thermal_flags flags;
188 struct acpi_thermal_state state;
189 struct acpi_thermal_trips trips;
190 struct acpi_handle_list devices;
191 struct thermal_zone_device *thermal_zone;
192 int tz_enabled;
193 int kelvin_offset;
194 struct work_struct thermal_check_work;
195};
196
197/* --------------------------------------------------------------------------
198 Thermal Zone Management
199 -------------------------------------------------------------------------- */
200
201static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
202{
203 acpi_status status = AE_OK;
204 unsigned long long tmp;
205
206 if (!tz)
207 return -EINVAL;
208
209 tz->last_temperature = tz->temperature;
210
211 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
212 if (ACPI_FAILURE(status))
213 return -ENODEV;
214
215 tz->temperature = tmp;
216 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
217 tz->temperature));
218
219 return 0;
220}
221
222static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
223{
224 acpi_status status = AE_OK;
225 unsigned long long tmp;
226
227 if (!tz)
228 return -EINVAL;
229
230 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
231 if (ACPI_FAILURE(status))
232 return -ENODEV;
233
234 tz->polling_frequency = tmp;
235 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
236 tz->polling_frequency));
237
238 return 0;
239}
240
241static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
242{
243 if (!tz)
244 return -EINVAL;
245
246 if (!acpi_has_method(tz->device->handle, "_SCP")) {
247 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
248 return -ENODEV;
249 } else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
250 "_SCP", mode))) {
251 return -ENODEV;
252 }
253
254 return 0;
255}
256
257#define ACPI_TRIPS_CRITICAL 0x01
258#define ACPI_TRIPS_HOT 0x02
259#define ACPI_TRIPS_PASSIVE 0x04
260#define ACPI_TRIPS_ACTIVE 0x08
261#define ACPI_TRIPS_DEVICES 0x10
262
263#define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
264#define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
265
266#define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
267 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
268 ACPI_TRIPS_DEVICES)
269
270/*
271 * This exception is thrown out in two cases:
272 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
273 * when re-evaluating the AML code.
274 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
275 * We need to re-bind the cooling devices of a thermal zone when this occurs.
276 */
277#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
278do { \
279 if (flags != ACPI_TRIPS_INIT) \
280 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
281 "ACPI thermal trip point %s changed\n" \
282 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
283} while (0)
284
285static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
286{
287 acpi_status status = AE_OK;
288 unsigned long long tmp;
289 struct acpi_handle_list devices;
290 int valid = 0;
291 int i;
292
293 /* Critical Shutdown */
294 if (flag & ACPI_TRIPS_CRITICAL) {
295 status = acpi_evaluate_integer(tz->device->handle,
296 "_CRT", NULL, &tmp);
297 tz->trips.critical.temperature = tmp;
298 /*
299 * Treat freezing temperatures as invalid as well; some
300 * BIOSes return really low values and cause reboots at startup.
301 * Below zero (Celsius) values clearly aren't right for sure..
302 * ... so lets discard those as invalid.
303 */
304 if (ACPI_FAILURE(status)) {
305 tz->trips.critical.flags.valid = 0;
306 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
307 "No critical threshold\n"));
308 } else if (tmp <= 2732) {
309 pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
310 tmp);
311 tz->trips.critical.flags.valid = 0;
312 } else {
313 tz->trips.critical.flags.valid = 1;
314 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
315 "Found critical threshold [%lu]\n",
316 tz->trips.critical.temperature));
317 }
318 if (tz->trips.critical.flags.valid == 1) {
319 if (crt == -1) {
320 tz->trips.critical.flags.valid = 0;
321 } else if (crt > 0) {
322 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
323 /*
324 * Allow override critical threshold
325 */
326 if (crt_k > tz->trips.critical.temperature)
327 pr_warn(PREFIX "Critical threshold %d C\n",
328 crt);
329 tz->trips.critical.temperature = crt_k;
330 }
331 }
332 }
333
334 /* Critical Sleep (optional) */
335 if (flag & ACPI_TRIPS_HOT) {
336 status = acpi_evaluate_integer(tz->device->handle,
337 "_HOT", NULL, &tmp);
338 if (ACPI_FAILURE(status)) {
339 tz->trips.hot.flags.valid = 0;
340 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
341 "No hot threshold\n"));
342 } else {
343 tz->trips.hot.temperature = tmp;
344 tz->trips.hot.flags.valid = 1;
345 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
346 "Found hot threshold [%lu]\n",
347 tz->trips.hot.temperature));
348 }
349 }
350
351 /* Passive (optional) */
352 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
353 (flag == ACPI_TRIPS_INIT)) {
354 valid = tz->trips.passive.flags.valid;
355 if (psv == -1) {
356 status = AE_SUPPORT;
357 } else if (psv > 0) {
358 tmp = CELSIUS_TO_KELVIN(psv);
359 status = AE_OK;
360 } else {
361 status = acpi_evaluate_integer(tz->device->handle,
362 "_PSV", NULL, &tmp);
363 }
364
365 if (ACPI_FAILURE(status))
366 tz->trips.passive.flags.valid = 0;
367 else {
368 tz->trips.passive.temperature = tmp;
369 tz->trips.passive.flags.valid = 1;
370 if (flag == ACPI_TRIPS_INIT) {
371 status = acpi_evaluate_integer(
372 tz->device->handle, "_TC1",
373 NULL, &tmp);
374 if (ACPI_FAILURE(status))
375 tz->trips.passive.flags.valid = 0;
376 else
377 tz->trips.passive.tc1 = tmp;
378 status = acpi_evaluate_integer(
379 tz->device->handle, "_TC2",
380 NULL, &tmp);
381 if (ACPI_FAILURE(status))
382 tz->trips.passive.flags.valid = 0;
383 else
384 tz->trips.passive.tc2 = tmp;
385 status = acpi_evaluate_integer(
386 tz->device->handle, "_TSP",
387 NULL, &tmp);
388 if (ACPI_FAILURE(status))
389 tz->trips.passive.flags.valid = 0;
390 else
391 tz->trips.passive.tsp = tmp;
392 }
393 }
394 }
395 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
396 memset(&devices, 0, sizeof(struct acpi_handle_list));
397 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
398 NULL, &devices);
399 if (ACPI_FAILURE(status)) {
400 pr_warn(PREFIX "Invalid passive threshold\n");
401 tz->trips.passive.flags.valid = 0;
402 }
403 else
404 tz->trips.passive.flags.valid = 1;
405
406 if (memcmp(&tz->trips.passive.devices, &devices,
407 sizeof(struct acpi_handle_list))) {
408 memcpy(&tz->trips.passive.devices, &devices,
409 sizeof(struct acpi_handle_list));
410 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
411 }
412 }
413 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
414 if (valid != tz->trips.passive.flags.valid)
415 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
416 }
417
418 /* Active (optional) */
419 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
420 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
421 valid = tz->trips.active[i].flags.valid;
422
423 if (act == -1)
424 break; /* disable all active trip points */
425
426 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
427 tz->trips.active[i].flags.valid)) {
428 status = acpi_evaluate_integer(tz->device->handle,
429 name, NULL, &tmp);
430 if (ACPI_FAILURE(status)) {
431 tz->trips.active[i].flags.valid = 0;
432 if (i == 0)
433 break;
434 if (act <= 0)
435 break;
436 if (i == 1)
437 tz->trips.active[0].temperature =
438 CELSIUS_TO_KELVIN(act);
439 else
440 /*
441 * Don't allow override higher than
442 * the next higher trip point
443 */
444 tz->trips.active[i - 1].temperature =
445 (tz->trips.active[i - 2].temperature <
446 CELSIUS_TO_KELVIN(act) ?
447 tz->trips.active[i - 2].temperature :
448 CELSIUS_TO_KELVIN(act));
449 break;
450 } else {
451 tz->trips.active[i].temperature = tmp;
452 tz->trips.active[i].flags.valid = 1;
453 }
454 }
455
456 name[2] = 'L';
457 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
458 memset(&devices, 0, sizeof(struct acpi_handle_list));
459 status = acpi_evaluate_reference(tz->device->handle,
460 name, NULL, &devices);
461 if (ACPI_FAILURE(status)) {
462 pr_warn(PREFIX "Invalid active%d threshold\n",
463 i);
464 tz->trips.active[i].flags.valid = 0;
465 }
466 else
467 tz->trips.active[i].flags.valid = 1;
468
469 if (memcmp(&tz->trips.active[i].devices, &devices,
470 sizeof(struct acpi_handle_list))) {
471 memcpy(&tz->trips.active[i].devices, &devices,
472 sizeof(struct acpi_handle_list));
473 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
474 }
475 }
476 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
477 if (valid != tz->trips.active[i].flags.valid)
478 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
479
480 if (!tz->trips.active[i].flags.valid)
481 break;
482 }
483
484 if ((flag & ACPI_TRIPS_DEVICES)
485 && acpi_has_method(tz->device->handle, "_TZD")) {
486 memset(&devices, 0, sizeof(devices));
487 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
488 NULL, &devices);
489 if (ACPI_SUCCESS(status)
490 && memcmp(&tz->devices, &devices, sizeof(devices))) {
491 tz->devices = devices;
492 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
493 }
494 }
495
496 return 0;
497}
498
499static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
500{
501 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
502
503 if (ret)
504 return ret;
505
506 valid = tz->trips.critical.flags.valid |
507 tz->trips.hot.flags.valid |
508 tz->trips.passive.flags.valid;
509
510 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
511 valid |= tz->trips.active[i].flags.valid;
512
513 if (!valid) {
514 pr_warn(FW_BUG "No valid trip found\n");
515 return -ENODEV;
516 }
517 return 0;
518}
519
520static void acpi_thermal_check(void *data)
521{
522 struct acpi_thermal *tz = data;
523
524 if (!tz->tz_enabled)
525 return;
526
527 thermal_zone_device_update(tz->thermal_zone);
528}
529
530/* sys I/F for generic thermal sysfs support */
531#define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
532
533static int thermal_get_temp(struct thermal_zone_device *thermal,
534 unsigned long *temp)
535{
536 struct acpi_thermal *tz = thermal->devdata;
537 int result;
538
539 if (!tz)
540 return -EINVAL;
541
542 result = acpi_thermal_get_temperature(tz);
543 if (result)
544 return result;
545
546 *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
547 return 0;
548}
549
550static int thermal_get_mode(struct thermal_zone_device *thermal,
551 enum thermal_device_mode *mode)
552{
553 struct acpi_thermal *tz = thermal->devdata;
554
555 if (!tz)
556 return -EINVAL;
557
558 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
559 THERMAL_DEVICE_DISABLED;
560
561 return 0;
562}
563
564static int thermal_set_mode(struct thermal_zone_device *thermal,
565 enum thermal_device_mode mode)
566{
567 struct acpi_thermal *tz = thermal->devdata;
568 int enable;
569
570 if (!tz)
571 return -EINVAL;
572
573 /*
574 * enable/disable thermal management from ACPI thermal driver
575 */
576 if (mode == THERMAL_DEVICE_ENABLED)
577 enable = 1;
578 else if (mode == THERMAL_DEVICE_DISABLED) {
579 enable = 0;
580 pr_warn("thermal zone will be disabled\n");
581 } else
582 return -EINVAL;
583
584 if (enable != tz->tz_enabled) {
585 tz->tz_enabled = enable;
586 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
587 "%s kernel ACPI thermal control\n",
588 tz->tz_enabled ? "Enable" : "Disable"));
589 acpi_thermal_check(tz);
590 }
591 return 0;
592}
593
594static int thermal_get_trip_type(struct thermal_zone_device *thermal,
595 int trip, enum thermal_trip_type *type)
596{
597 struct acpi_thermal *tz = thermal->devdata;
598 int i;
599
600 if (!tz || trip < 0)
601 return -EINVAL;
602
603 if (tz->trips.critical.flags.valid) {
604 if (!trip) {
605 *type = THERMAL_TRIP_CRITICAL;
606 return 0;
607 }
608 trip--;
609 }
610
611 if (tz->trips.hot.flags.valid) {
612 if (!trip) {
613 *type = THERMAL_TRIP_HOT;
614 return 0;
615 }
616 trip--;
617 }
618
619 if (tz->trips.passive.flags.valid) {
620 if (!trip) {
621 *type = THERMAL_TRIP_PASSIVE;
622 return 0;
623 }
624 trip--;
625 }
626
627 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
628 tz->trips.active[i].flags.valid; i++) {
629 if (!trip) {
630 *type = THERMAL_TRIP_ACTIVE;
631 return 0;
632 }
633 trip--;
634 }
635
636 return -EINVAL;
637}
638
639static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
640 int trip, unsigned long *temp)
641{
642 struct acpi_thermal *tz = thermal->devdata;
643 int i;
644
645 if (!tz || trip < 0)
646 return -EINVAL;
647
648 if (tz->trips.critical.flags.valid) {
649 if (!trip) {
650 *temp = KELVIN_TO_MILLICELSIUS(
651 tz->trips.critical.temperature,
652 tz->kelvin_offset);
653 return 0;
654 }
655 trip--;
656 }
657
658 if (tz->trips.hot.flags.valid) {
659 if (!trip) {
660 *temp = KELVIN_TO_MILLICELSIUS(
661 tz->trips.hot.temperature,
662 tz->kelvin_offset);
663 return 0;
664 }
665 trip--;
666 }
667
668 if (tz->trips.passive.flags.valid) {
669 if (!trip) {
670 *temp = KELVIN_TO_MILLICELSIUS(
671 tz->trips.passive.temperature,
672 tz->kelvin_offset);
673 return 0;
674 }
675 trip--;
676 }
677
678 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
679 tz->trips.active[i].flags.valid; i++) {
680 if (!trip) {
681 *temp = KELVIN_TO_MILLICELSIUS(
682 tz->trips.active[i].temperature,
683 tz->kelvin_offset);
684 return 0;
685 }
686 trip--;
687 }
688
689 return -EINVAL;
690}
691
692static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
693 unsigned long *temperature) {
694 struct acpi_thermal *tz = thermal->devdata;
695
696 if (tz->trips.critical.flags.valid) {
697 *temperature = KELVIN_TO_MILLICELSIUS(
698 tz->trips.critical.temperature,
699 tz->kelvin_offset);
700 return 0;
701 } else
702 return -EINVAL;
703}
704
705static int thermal_get_trend(struct thermal_zone_device *thermal,
706 int trip, enum thermal_trend *trend)
707{
708 struct acpi_thermal *tz = thermal->devdata;
709 enum thermal_trip_type type;
710 int i;
711
712 if (thermal_get_trip_type(thermal, trip, &type))
713 return -EINVAL;
714
715 if (type == THERMAL_TRIP_ACTIVE) {
716 unsigned long trip_temp;
717 unsigned long temp = KELVIN_TO_MILLICELSIUS(tz->temperature,
718 tz->kelvin_offset);
719 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
720 return -EINVAL;
721
722 if (temp > trip_temp) {
723 *trend = THERMAL_TREND_RAISING;
724 return 0;
725 } else {
726 /* Fall back on default trend */
727 return -EINVAL;
728 }
729 }
730
731 /*
732 * tz->temperature has already been updated by generic thermal layer,
733 * before this callback being invoked
734 */
735 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
736 + (tz->trips.passive.tc2
737 * (tz->temperature - tz->trips.passive.temperature));
738
739 if (i > 0)
740 *trend = THERMAL_TREND_RAISING;
741 else if (i < 0)
742 *trend = THERMAL_TREND_DROPPING;
743 else
744 *trend = THERMAL_TREND_STABLE;
745 return 0;
746}
747
748
749static int thermal_notify(struct thermal_zone_device *thermal, int trip,
750 enum thermal_trip_type trip_type)
751{
752 u8 type = 0;
753 struct acpi_thermal *tz = thermal->devdata;
754
755 if (trip_type == THERMAL_TRIP_CRITICAL)
756 type = ACPI_THERMAL_NOTIFY_CRITICAL;
757 else if (trip_type == THERMAL_TRIP_HOT)
758 type = ACPI_THERMAL_NOTIFY_HOT;
759 else
760 return 0;
761
762 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
763 dev_name(&tz->device->dev), type, 1);
764
765 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
766 return 1;
767
768 return 0;
769}
770
771static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
772 struct thermal_cooling_device *cdev,
773 bool bind)
774{
775 struct acpi_device *device = cdev->devdata;
776 struct acpi_thermal *tz = thermal->devdata;
777 struct acpi_device *dev;
778 acpi_status status;
779 acpi_handle handle;
780 int i;
781 int j;
782 int trip = -1;
783 int result = 0;
784
785 if (tz->trips.critical.flags.valid)
786 trip++;
787
788 if (tz->trips.hot.flags.valid)
789 trip++;
790
791 if (tz->trips.passive.flags.valid) {
792 trip++;
793 for (i = 0; i < tz->trips.passive.devices.count;
794 i++) {
795 handle = tz->trips.passive.devices.handles[i];
796 status = acpi_bus_get_device(handle, &dev);
797 if (ACPI_FAILURE(status) || dev != device)
798 continue;
799 if (bind)
800 result =
801 thermal_zone_bind_cooling_device
802 (thermal, trip, cdev,
803 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
804 else
805 result =
806 thermal_zone_unbind_cooling_device
807 (thermal, trip, cdev);
808 if (result)
809 goto failed;
810 }
811 }
812
813 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
814 if (!tz->trips.active[i].flags.valid)
815 break;
816 trip++;
817 for (j = 0;
818 j < tz->trips.active[i].devices.count;
819 j++) {
820 handle = tz->trips.active[i].devices.handles[j];
821 status = acpi_bus_get_device(handle, &dev);
822 if (ACPI_FAILURE(status) || dev != device)
823 continue;
824 if (bind)
825 result = thermal_zone_bind_cooling_device
826 (thermal, trip, cdev,
827 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
828 else
829 result = thermal_zone_unbind_cooling_device
830 (thermal, trip, cdev);
831 if (result)
832 goto failed;
833 }
834 }
835
836 for (i = 0; i < tz->devices.count; i++) {
837 handle = tz->devices.handles[i];
838 status = acpi_bus_get_device(handle, &dev);
839 if (ACPI_SUCCESS(status) && (dev == device)) {
840 if (bind)
841 result = thermal_zone_bind_cooling_device
842 (thermal, THERMAL_TRIPS_NONE,
843 cdev, THERMAL_NO_LIMIT,
844 THERMAL_NO_LIMIT);
845 else
846 result = thermal_zone_unbind_cooling_device
847 (thermal, THERMAL_TRIPS_NONE,
848 cdev);
849 if (result)
850 goto failed;
851 }
852 }
853
854failed:
855 return result;
856}
857
858static int
859acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
860 struct thermal_cooling_device *cdev)
861{
862 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
863}
864
865static int
866acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
867 struct thermal_cooling_device *cdev)
868{
869 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
870}
871
872static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
873 .bind = acpi_thermal_bind_cooling_device,
874 .unbind = acpi_thermal_unbind_cooling_device,
875 .get_temp = thermal_get_temp,
876 .get_mode = thermal_get_mode,
877 .set_mode = thermal_set_mode,
878 .get_trip_type = thermal_get_trip_type,
879 .get_trip_temp = thermal_get_trip_temp,
880 .get_crit_temp = thermal_get_crit_temp,
881 .get_trend = thermal_get_trend,
882 .notify = thermal_notify,
883};
884
885static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
886{
887 int trips = 0;
888 int result;
889 acpi_status status;
890 int i;
891
892 if (tz->trips.critical.flags.valid)
893 trips++;
894
895 if (tz->trips.hot.flags.valid)
896 trips++;
897
898 if (tz->trips.passive.flags.valid)
899 trips++;
900
901 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
902 tz->trips.active[i].flags.valid; i++, trips++);
903
904 if (tz->trips.passive.flags.valid)
905 tz->thermal_zone =
906 thermal_zone_device_register("acpitz", trips, 0, tz,
907 &acpi_thermal_zone_ops, NULL,
908 tz->trips.passive.tsp*100,
909 tz->polling_frequency*100);
910 else
911 tz->thermal_zone =
912 thermal_zone_device_register("acpitz", trips, 0, tz,
913 &acpi_thermal_zone_ops, NULL,
914 0, tz->polling_frequency*100);
915 if (IS_ERR(tz->thermal_zone))
916 return -ENODEV;
917
918 result = sysfs_create_link(&tz->device->dev.kobj,
919 &tz->thermal_zone->device.kobj, "thermal_zone");
920 if (result)
921 return result;
922
923 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
924 &tz->device->dev.kobj, "device");
925 if (result)
926 return result;
927
928 status = acpi_attach_data(tz->device->handle,
929 acpi_bus_private_data_handler,
930 tz->thermal_zone);
931 if (ACPI_FAILURE(status)) {
932 pr_err(PREFIX "Error attaching device data\n");
933 return -ENODEV;
934 }
935
936 tz->tz_enabled = 1;
937
938 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
939 tz->thermal_zone->id);
940 return 0;
941}
942
943static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
944{
945 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
946 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
947 thermal_zone_device_unregister(tz->thermal_zone);
948 tz->thermal_zone = NULL;
949 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
950}
951
952
953/* --------------------------------------------------------------------------
954 Driver Interface
955 -------------------------------------------------------------------------- */
956
957static void acpi_thermal_notify(struct acpi_device *device, u32 event)
958{
959 struct acpi_thermal *tz = acpi_driver_data(device);
960
961
962 if (!tz)
963 return;
964
965 switch (event) {
966 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
967 acpi_thermal_check(tz);
968 break;
969 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
970 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
971 acpi_thermal_check(tz);
972 acpi_bus_generate_netlink_event(device->pnp.device_class,
973 dev_name(&device->dev), event, 0);
974 break;
975 case ACPI_THERMAL_NOTIFY_DEVICES:
976 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
977 acpi_thermal_check(tz);
978 acpi_bus_generate_netlink_event(device->pnp.device_class,
979 dev_name(&device->dev), event, 0);
980 break;
981 default:
982 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
983 "Unsupported event [0x%x]\n", event));
984 break;
985 }
986}
987
988/*
989 * On some platforms, the AML code has dependency about
990 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
991 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
992 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
993 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
994 * if _TMP has never been evaluated.
995 *
996 * As this dependency is totally transparent to OS, evaluate
997 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
998 * _TMP, before they are actually used.
999 */
1000static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
1001{
1002 acpi_handle handle = tz->device->handle;
1003 unsigned long long value;
1004 int i;
1005
1006 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1007 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1008 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1009 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1010 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1011 acpi_status status;
1012
1013 status = acpi_evaluate_integer(handle, name, NULL, &value);
1014 if (status == AE_NOT_FOUND)
1015 break;
1016 }
1017 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1018}
1019
1020static int acpi_thermal_get_info(struct acpi_thermal *tz)
1021{
1022 int result = 0;
1023
1024
1025 if (!tz)
1026 return -EINVAL;
1027
1028 acpi_thermal_aml_dependency_fix(tz);
1029
1030 /* Get trip points [_CRT, _PSV, etc.] (required) */
1031 result = acpi_thermal_get_trip_points(tz);
1032 if (result)
1033 return result;
1034
1035 /* Get temperature [_TMP] (required) */
1036 result = acpi_thermal_get_temperature(tz);
1037 if (result)
1038 return result;
1039
1040 /* Set the cooling mode [_SCP] to active cooling (default) */
1041 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1042 if (!result)
1043 tz->flags.cooling_mode = 1;
1044
1045 /* Get default polling frequency [_TZP] (optional) */
1046 if (tzp)
1047 tz->polling_frequency = tzp;
1048 else
1049 acpi_thermal_get_polling_frequency(tz);
1050
1051 return 0;
1052}
1053
1054/*
1055 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1056 * handles temperature values with a single decimal place. As a consequence,
1057 * some implementations use an offset of 273.1 and others use an offset of
1058 * 273.2. Try to find out which one is being used, to present the most
1059 * accurate and visually appealing number.
1060 *
1061 * The heuristic below should work for all ACPI thermal zones which have a
1062 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1063 */
1064static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1065{
1066 if (tz->trips.critical.flags.valid &&
1067 (tz->trips.critical.temperature % 5) == 1)
1068 tz->kelvin_offset = 2731;
1069 else
1070 tz->kelvin_offset = 2732;
1071}
1072
1073static void acpi_thermal_check_fn(struct work_struct *work)
1074{
1075 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1076 thermal_check_work);
1077 acpi_thermal_check(tz);
1078}
1079
1080static int acpi_thermal_add(struct acpi_device *device)
1081{
1082 int result = 0;
1083 struct acpi_thermal *tz = NULL;
1084
1085
1086 if (!device)
1087 return -EINVAL;
1088
1089 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1090 if (!tz)
1091 return -ENOMEM;
1092
1093 tz->device = device;
1094 strcpy(tz->name, device->pnp.bus_id);
1095 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1096 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1097 device->driver_data = tz;
1098
1099 result = acpi_thermal_get_info(tz);
1100 if (result)
1101 goto free_memory;
1102
1103 acpi_thermal_guess_offset(tz);
1104
1105 result = acpi_thermal_register_thermal_zone(tz);
1106 if (result)
1107 goto free_memory;
1108
1109 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1110
1111 pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1112 acpi_device_bid(device), KELVIN_TO_CELSIUS(tz->temperature));
1113 goto end;
1114
1115free_memory:
1116 kfree(tz);
1117end:
1118 return result;
1119}
1120
1121static int acpi_thermal_remove(struct acpi_device *device)
1122{
1123 struct acpi_thermal *tz = NULL;
1124
1125 if (!device || !acpi_driver_data(device))
1126 return -EINVAL;
1127
1128 flush_workqueue(acpi_thermal_pm_queue);
1129 tz = acpi_driver_data(device);
1130
1131 acpi_thermal_unregister_thermal_zone(tz);
1132 kfree(tz);
1133 return 0;
1134}
1135
1136#ifdef CONFIG_PM_SLEEP
1137static int acpi_thermal_suspend(struct device *dev)
1138{
1139 /* Make sure the previously queued thermal check work has been done */
1140 flush_workqueue(acpi_thermal_pm_queue);
1141 return 0;
1142}
1143
1144static int acpi_thermal_resume(struct device *dev)
1145{
1146 struct acpi_thermal *tz;
1147 int i, j, power_state, result;
1148
1149 if (!dev)
1150 return -EINVAL;
1151
1152 tz = acpi_driver_data(to_acpi_device(dev));
1153 if (!tz)
1154 return -EINVAL;
1155
1156 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1157 if (!(&tz->trips.active[i]))
1158 break;
1159 if (!tz->trips.active[i].flags.valid)
1160 break;
1161 tz->trips.active[i].flags.enabled = 1;
1162 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1163 result = acpi_bus_update_power(
1164 tz->trips.active[i].devices.handles[j],
1165 &power_state);
1166 if (result || (power_state != ACPI_STATE_D0)) {
1167 tz->trips.active[i].flags.enabled = 0;
1168 break;
1169 }
1170 }
1171 tz->state.active |= tz->trips.active[i].flags.enabled;
1172 }
1173
1174 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1175
1176 return AE_OK;
1177}
1178#endif
1179
1180static int thermal_act(const struct dmi_system_id *d) {
1181
1182 if (act == 0) {
1183 pr_notice(PREFIX "%s detected: "
1184 "disabling all active thermal trip points\n", d->ident);
1185 act = -1;
1186 }
1187 return 0;
1188}
1189static int thermal_nocrt(const struct dmi_system_id *d) {
1190
1191 pr_notice(PREFIX "%s detected: "
1192 "disabling all critical thermal trip point actions.\n", d->ident);
1193 nocrt = 1;
1194 return 0;
1195}
1196static int thermal_tzp(const struct dmi_system_id *d) {
1197
1198 if (tzp == 0) {
1199 pr_notice(PREFIX "%s detected: "
1200 "enabling thermal zone polling\n", d->ident);
1201 tzp = 300; /* 300 dS = 30 Seconds */
1202 }
1203 return 0;
1204}
1205static int thermal_psv(const struct dmi_system_id *d) {
1206
1207 if (psv == 0) {
1208 pr_notice(PREFIX "%s detected: "
1209 "disabling all passive thermal trip points\n", d->ident);
1210 psv = -1;
1211 }
1212 return 0;
1213}
1214
1215static struct dmi_system_id thermal_dmi_table[] __initdata = {
1216 /*
1217 * Award BIOS on this AOpen makes thermal control almost worthless.
1218 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1219 */
1220 {
1221 .callback = thermal_act,
1222 .ident = "AOpen i915GMm-HFS",
1223 .matches = {
1224 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1225 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1226 },
1227 },
1228 {
1229 .callback = thermal_psv,
1230 .ident = "AOpen i915GMm-HFS",
1231 .matches = {
1232 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1233 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1234 },
1235 },
1236 {
1237 .callback = thermal_tzp,
1238 .ident = "AOpen i915GMm-HFS",
1239 .matches = {
1240 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1241 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1242 },
1243 },
1244 {
1245 .callback = thermal_nocrt,
1246 .ident = "Gigabyte GA-7ZX",
1247 .matches = {
1248 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1249 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1250 },
1251 },
1252 {}
1253};
1254
1255static int __init acpi_thermal_init(void)
1256{
1257 int result = 0;
1258
1259 dmi_check_system(thermal_dmi_table);
1260
1261 if (off) {
1262 pr_notice(PREFIX "thermal control disabled\n");
1263 return -ENODEV;
1264 }
1265
1266 acpi_thermal_pm_queue = create_workqueue("acpi_thermal_pm");
1267 if (!acpi_thermal_pm_queue)
1268 return -ENODEV;
1269
1270 result = acpi_bus_register_driver(&acpi_thermal_driver);
1271 if (result < 0) {
1272 destroy_workqueue(acpi_thermal_pm_queue);
1273 return -ENODEV;
1274 }
1275
1276 return 0;
1277}
1278
1279static void __exit acpi_thermal_exit(void)
1280{
1281 acpi_bus_unregister_driver(&acpi_thermal_driver);
1282 destroy_workqueue(acpi_thermal_pm_queue);
1283
1284 return;
1285}
1286
1287module_init(acpi_thermal_init);
1288module_exit(acpi_thermal_exit);