Merge tag 'kvm-s390-next-6.4-2' of https://git.kernel.org/pub/scm/linux/kernel/git...
[linux-block.git] / drivers / acpi / thermal.c
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 void 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
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
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
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
263 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
264 {
265         acpi_status status;
266         unsigned long long tmp;
267         struct acpi_handle_list devices;
268         int valid = 0;
269         int i;
270
271         /* Critical Shutdown */
272         if (flag & ACPI_TRIPS_CRITICAL) {
273                 status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL, &tmp);
274                 tz->trips.critical.temperature = tmp;
275                 /*
276                  * Treat freezing temperatures as invalid as well; some
277                  * BIOSes return really low values and cause reboots at startup.
278                  * Below zero (Celsius) values clearly aren't right for sure..
279                  * ... so lets discard those as invalid.
280                  */
281                 if (ACPI_FAILURE(status)) {
282                         tz->trips.critical.flags.valid = 0;
283                         acpi_handle_debug(tz->device->handle,
284                                           "No critical threshold\n");
285                 } else if (tmp <= 2732) {
286                         pr_info(FW_BUG "Invalid critical threshold (%llu)\n", tmp);
287                         tz->trips.critical.flags.valid = 0;
288                 } else {
289                         tz->trips.critical.flags.valid = 1;
290                         acpi_handle_debug(tz->device->handle,
291                                           "Found critical threshold [%lu]\n",
292                                           tz->trips.critical.temperature);
293                 }
294                 if (tz->trips.critical.flags.valid) {
295                         if (crt == -1) {
296                                 tz->trips.critical.flags.valid = 0;
297                         } else if (crt > 0) {
298                                 unsigned long crt_k = celsius_to_deci_kelvin(crt);
299
300                                 /*
301                                  * Allow override critical threshold
302                                  */
303                                 if (crt_k > tz->trips.critical.temperature)
304                                         pr_info("Critical threshold %d C\n", crt);
305
306                                 tz->trips.critical.temperature = crt_k;
307                         }
308                 }
309         }
310
311         /* Critical Sleep (optional) */
312         if (flag & ACPI_TRIPS_HOT) {
313                 status = acpi_evaluate_integer(tz->device->handle, "_HOT", NULL, &tmp);
314                 if (ACPI_FAILURE(status)) {
315                         tz->trips.hot.flags.valid = 0;
316                         acpi_handle_debug(tz->device->handle,
317                                           "No hot threshold\n");
318                 } else {
319                         tz->trips.hot.temperature = tmp;
320                         tz->trips.hot.flags.valid = 1;
321                         acpi_handle_debug(tz->device->handle,
322                                           "Found hot threshold [%lu]\n",
323                                           tz->trips.hot.temperature);
324                 }
325         }
326
327         /* Passive (optional) */
328         if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
329             flag == ACPI_TRIPS_INIT) {
330                 valid = tz->trips.passive.flags.valid;
331                 if (psv == -1) {
332                         status = AE_SUPPORT;
333                 } else if (psv > 0) {
334                         tmp = celsius_to_deci_kelvin(psv);
335                         status = AE_OK;
336                 } else {
337                         status = acpi_evaluate_integer(tz->device->handle,
338                                                        "_PSV", NULL, &tmp);
339                 }
340
341                 if (ACPI_FAILURE(status)) {
342                         tz->trips.passive.flags.valid = 0;
343                 } else {
344                         tz->trips.passive.temperature = tmp;
345                         tz->trips.passive.flags.valid = 1;
346                         if (flag == ACPI_TRIPS_INIT) {
347                                 status = acpi_evaluate_integer(tz->device->handle,
348                                                                "_TC1", NULL, &tmp);
349                                 if (ACPI_FAILURE(status))
350                                         tz->trips.passive.flags.valid = 0;
351                                 else
352                                         tz->trips.passive.tc1 = tmp;
353
354                                 status = acpi_evaluate_integer(tz->device->handle,
355                                                                "_TC2", NULL, &tmp);
356                                 if (ACPI_FAILURE(status))
357                                         tz->trips.passive.flags.valid = 0;
358                                 else
359                                         tz->trips.passive.tc2 = tmp;
360
361                                 status = acpi_evaluate_integer(tz->device->handle,
362                                                                "_TSP", NULL, &tmp);
363                                 if (ACPI_FAILURE(status))
364                                         tz->trips.passive.flags.valid = 0;
365                                 else
366                                         tz->trips.passive.tsp = tmp;
367                         }
368                 }
369         }
370         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
371                 memset(&devices, 0, sizeof(struct acpi_handle_list));
372                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
373                                                  NULL, &devices);
374                 if (ACPI_FAILURE(status)) {
375                         acpi_handle_info(tz->device->handle,
376                                          "Invalid passive threshold\n");
377                         tz->trips.passive.flags.valid = 0;
378                 } else {
379                         tz->trips.passive.flags.valid = 1;
380                 }
381
382                 if (memcmp(&tz->trips.passive.devices, &devices,
383                            sizeof(struct acpi_handle_list))) {
384                         memcpy(&tz->trips.passive.devices, &devices,
385                                sizeof(struct acpi_handle_list));
386                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
387                 }
388         }
389         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
390                 if (valid != tz->trips.passive.flags.valid)
391                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
392         }
393
394         /* Active (optional) */
395         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
396                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
397                 valid = tz->trips.active[i].flags.valid;
398
399                 if (act == -1)
400                         break; /* disable all active trip points */
401
402                 if (flag == ACPI_TRIPS_INIT || ((flag & ACPI_TRIPS_ACTIVE) &&
403                     tz->trips.active[i].flags.valid)) {
404                         status = acpi_evaluate_integer(tz->device->handle,
405                                                        name, NULL, &tmp);
406                         if (ACPI_FAILURE(status)) {
407                                 tz->trips.active[i].flags.valid = 0;
408                                 if (i == 0)
409                                         break;
410
411                                 if (act <= 0)
412                                         break;
413
414                                 if (i == 1)
415                                         tz->trips.active[0].temperature = celsius_to_deci_kelvin(act);
416                                 else
417                                         /*
418                                          * Don't allow override higher than
419                                          * the next higher trip point
420                                          */
421                                         tz->trips.active[i-1].temperature =
422                                                 min_t(unsigned long,
423                                                       tz->trips.active[i-2].temperature,
424                                                       celsius_to_deci_kelvin(act));
425
426                                 break;
427                         } else {
428                                 tz->trips.active[i].temperature = tmp;
429                                 tz->trips.active[i].flags.valid = 1;
430                         }
431                 }
432
433                 name[2] = 'L';
434                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid) {
435                         memset(&devices, 0, sizeof(struct acpi_handle_list));
436                         status = acpi_evaluate_reference(tz->device->handle,
437                                                          name, NULL, &devices);
438                         if (ACPI_FAILURE(status)) {
439                                 acpi_handle_info(tz->device->handle,
440                                                  "Invalid active%d threshold\n", i);
441                                 tz->trips.active[i].flags.valid = 0;
442                         } else {
443                                 tz->trips.active[i].flags.valid = 1;
444                         }
445
446                         if (memcmp(&tz->trips.active[i].devices, &devices,
447                                    sizeof(struct acpi_handle_list))) {
448                                 memcpy(&tz->trips.active[i].devices, &devices,
449                                        sizeof(struct acpi_handle_list));
450                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
451                         }
452                 }
453                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
454                         if (valid != tz->trips.active[i].flags.valid)
455                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
456
457                 if (!tz->trips.active[i].flags.valid)
458                         break;
459         }
460
461         if (flag & ACPI_TRIPS_DEVICES) {
462                 memset(&devices, 0, sizeof(devices));
463                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
464                                                  NULL, &devices);
465                 if (ACPI_SUCCESS(status) &&
466                     memcmp(&tz->devices, &devices, sizeof(devices))) {
467                         tz->devices = devices;
468                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
469                 }
470         }
471
472         return 0;
473 }
474
475 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
476 {
477         int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
478
479         if (ret)
480                 return ret;
481
482         valid = tz->trips.critical.flags.valid |
483                 tz->trips.hot.flags.valid |
484                 tz->trips.passive.flags.valid;
485
486         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
487                 valid |= tz->trips.active[i].flags.valid;
488
489         if (!valid) {
490                 pr_warn(FW_BUG "No valid trip found\n");
491                 return -ENODEV;
492         }
493         return 0;
494 }
495
496 /* sys I/F for generic thermal sysfs support */
497
498 static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
499 {
500         struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
501         int result;
502
503         if (!tz)
504                 return -EINVAL;
505
506         result = acpi_thermal_get_temperature(tz);
507         if (result)
508                 return result;
509
510         *temp = deci_kelvin_to_millicelsius_with_offset(tz->temperature,
511                                                         tz->kelvin_offset);
512         return 0;
513 }
514
515 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
516                                  int trip, enum thermal_trip_type *type)
517 {
518         struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
519         int i;
520
521         if (!tz || trip < 0)
522                 return -EINVAL;
523
524         if (tz->trips.critical.flags.valid) {
525                 if (!trip) {
526                         *type = THERMAL_TRIP_CRITICAL;
527                         return 0;
528                 }
529                 trip--;
530         }
531
532         if (tz->trips.hot.flags.valid) {
533                 if (!trip) {
534                         *type = THERMAL_TRIP_HOT;
535                         return 0;
536                 }
537                 trip--;
538         }
539
540         if (tz->trips.passive.flags.valid) {
541                 if (!trip) {
542                         *type = THERMAL_TRIP_PASSIVE;
543                         return 0;
544                 }
545                 trip--;
546         }
547
548         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].flags.valid; i++) {
549                 if (!trip) {
550                         *type = THERMAL_TRIP_ACTIVE;
551                         return 0;
552                 }
553                 trip--;
554         }
555
556         return -EINVAL;
557 }
558
559 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
560                                  int trip, int *temp)
561 {
562         struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
563         int i;
564
565         if (!tz || trip < 0)
566                 return -EINVAL;
567
568         if (tz->trips.critical.flags.valid) {
569                 if (!trip) {
570                         *temp = deci_kelvin_to_millicelsius_with_offset(
571                                         tz->trips.critical.temperature,
572                                         tz->kelvin_offset);
573                         return 0;
574                 }
575                 trip--;
576         }
577
578         if (tz->trips.hot.flags.valid) {
579                 if (!trip) {
580                         *temp = deci_kelvin_to_millicelsius_with_offset(
581                                         tz->trips.hot.temperature,
582                                         tz->kelvin_offset);
583                         return 0;
584                 }
585                 trip--;
586         }
587
588         if (tz->trips.passive.flags.valid) {
589                 if (!trip) {
590                         *temp = deci_kelvin_to_millicelsius_with_offset(
591                                         tz->trips.passive.temperature,
592                                         tz->kelvin_offset);
593                         return 0;
594                 }
595                 trip--;
596         }
597
598         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
599                 tz->trips.active[i].flags.valid; i++) {
600                 if (!trip) {
601                         *temp = deci_kelvin_to_millicelsius_with_offset(
602                                         tz->trips.active[i].temperature,
603                                         tz->kelvin_offset);
604                         return 0;
605                 }
606                 trip--;
607         }
608
609         return -EINVAL;
610 }
611
612 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
613                                 int *temperature)
614 {
615         struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
616
617         if (tz->trips.critical.flags.valid) {
618                 *temperature = deci_kelvin_to_millicelsius_with_offset(
619                                         tz->trips.critical.temperature,
620                                         tz->kelvin_offset);
621                 return 0;
622         }
623
624         return -EINVAL;
625 }
626
627 static int thermal_get_trend(struct thermal_zone_device *thermal,
628                              int trip, enum thermal_trend *trend)
629 {
630         struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
631         enum thermal_trip_type type;
632         int i;
633
634         if (thermal_get_trip_type(thermal, trip, &type))
635                 return -EINVAL;
636
637         if (type == THERMAL_TRIP_ACTIVE) {
638                 int trip_temp;
639                 int temp = deci_kelvin_to_millicelsius_with_offset(
640                                         tz->temperature, tz->kelvin_offset);
641                 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
642                         return -EINVAL;
643
644                 if (temp > trip_temp) {
645                         *trend = THERMAL_TREND_RAISING;
646                         return 0;
647                 } else {
648                         /* Fall back on default trend */
649                         return -EINVAL;
650                 }
651         }
652
653         /*
654          * tz->temperature has already been updated by generic thermal layer,
655          * before this callback being invoked
656          */
657         i = tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature) +
658             tz->trips.passive.tc2 * (tz->temperature - tz->trips.passive.temperature);
659
660         if (i > 0)
661                 *trend = THERMAL_TREND_RAISING;
662         else if (i < 0)
663                 *trend = THERMAL_TREND_DROPPING;
664         else
665                 *trend = THERMAL_TREND_STABLE;
666
667         return 0;
668 }
669
670 static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
671 {
672         struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
673
674         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
675                                         dev_name(&tz->device->dev),
676                                         ACPI_THERMAL_NOTIFY_HOT, 1);
677 }
678
679 static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
680 {
681         struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
682
683         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
684                                         dev_name(&tz->device->dev),
685                                         ACPI_THERMAL_NOTIFY_CRITICAL, 1);
686
687         thermal_zone_device_critical(thermal);
688 }
689
690 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
691                                           struct thermal_cooling_device *cdev,
692                                           bool bind)
693 {
694         struct acpi_device *device = cdev->devdata;
695         struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
696         struct acpi_device *dev;
697         acpi_handle handle;
698         int i;
699         int j;
700         int trip = -1;
701         int result = 0;
702
703         if (tz->trips.critical.flags.valid)
704                 trip++;
705
706         if (tz->trips.hot.flags.valid)
707                 trip++;
708
709         if (tz->trips.passive.flags.valid) {
710                 trip++;
711                 for (i = 0; i < tz->trips.passive.devices.count; i++) {
712                         handle = tz->trips.passive.devices.handles[i];
713                         dev = acpi_fetch_acpi_dev(handle);
714                         if (dev != device)
715                                 continue;
716
717                         if (bind)
718                                 result = thermal_zone_bind_cooling_device(
719                                                 thermal, trip, cdev,
720                                                 THERMAL_NO_LIMIT,
721                                                 THERMAL_NO_LIMIT,
722                                                 THERMAL_WEIGHT_DEFAULT);
723                         else
724                                 result =
725                                         thermal_zone_unbind_cooling_device(
726                                                 thermal, trip, cdev);
727
728                         if (result)
729                                 goto failed;
730                 }
731         }
732
733         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
734                 if (!tz->trips.active[i].flags.valid)
735                         break;
736
737                 trip++;
738                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
739                         handle = tz->trips.active[i].devices.handles[j];
740                         dev = acpi_fetch_acpi_dev(handle);
741                         if (dev != device)
742                                 continue;
743
744                         if (bind)
745                                 result = thermal_zone_bind_cooling_device(
746                                                 thermal, trip, cdev,
747                                                 THERMAL_NO_LIMIT,
748                                                 THERMAL_NO_LIMIT,
749                                                 THERMAL_WEIGHT_DEFAULT);
750                         else
751                                 result = thermal_zone_unbind_cooling_device(
752                                                 thermal, trip, cdev);
753
754                         if (result)
755                                 goto failed;
756                 }
757         }
758
759 failed:
760         return result;
761 }
762
763 static int
764 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
765                                  struct thermal_cooling_device *cdev)
766 {
767         return acpi_thermal_cooling_device_cb(thermal, cdev, true);
768 }
769
770 static int
771 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
772                                    struct thermal_cooling_device *cdev)
773 {
774         return acpi_thermal_cooling_device_cb(thermal, cdev, false);
775 }
776
777 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
778         .bind = acpi_thermal_bind_cooling_device,
779         .unbind = acpi_thermal_unbind_cooling_device,
780         .get_temp = thermal_get_temp,
781         .get_trip_type = thermal_get_trip_type,
782         .get_trip_temp = thermal_get_trip_temp,
783         .get_crit_temp = thermal_get_crit_temp,
784         .get_trend = thermal_get_trend,
785         .hot = acpi_thermal_zone_device_hot,
786         .critical = acpi_thermal_zone_device_critical,
787 };
788
789 static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz)
790 {
791         struct device *tzdev = thermal_zone_device(tz->thermal_zone);
792         int ret;
793
794         ret = sysfs_create_link(&tz->device->dev.kobj,
795                                 &tzdev->kobj, "thermal_zone");
796         if (ret)
797                 return ret;
798
799         ret = sysfs_create_link(&tzdev->kobj,
800                                    &tz->device->dev.kobj, "device");
801         if (ret)
802                 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
803
804         return ret;
805 }
806
807 static void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz)
808 {
809         struct device *tzdev = thermal_zone_device(tz->thermal_zone);
810
811         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
812         sysfs_remove_link(&tzdev->kobj, "device");
813 }
814
815 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
816 {
817         int trips = 0;
818         int result;
819         acpi_status status;
820         int i;
821
822         if (tz->trips.critical.flags.valid)
823                 trips++;
824
825         if (tz->trips.hot.flags.valid)
826                 trips++;
827
828         if (tz->trips.passive.flags.valid)
829                 trips++;
830
831         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE && tz->trips.active[i].flags.valid;
832              i++, trips++);
833
834         if (tz->trips.passive.flags.valid)
835                 tz->thermal_zone = thermal_zone_device_register("acpitz", trips, 0, tz,
836                                                                 &acpi_thermal_zone_ops, NULL,
837                                                                 tz->trips.passive.tsp * 100,
838                                                                 tz->polling_frequency * 100);
839         else
840                 tz->thermal_zone =
841                         thermal_zone_device_register("acpitz", trips, 0, tz,
842                                                      &acpi_thermal_zone_ops, NULL,
843                                                      0, tz->polling_frequency * 100);
844
845         if (IS_ERR(tz->thermal_zone))
846                 return -ENODEV;
847
848         result = acpi_thermal_zone_sysfs_add(tz);
849         if (result)
850                 goto unregister_tzd;
851
852         status =  acpi_bus_attach_private_data(tz->device->handle,
853                                                tz->thermal_zone);
854         if (ACPI_FAILURE(status)) {
855                 result = -ENODEV;
856                 goto remove_links;
857         }
858
859         result = thermal_zone_device_enable(tz->thermal_zone);
860         if (result)
861                 goto acpi_bus_detach;
862
863         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
864                  thermal_zone_device_id(tz->thermal_zone));
865
866         return 0;
867
868 acpi_bus_detach:
869         acpi_bus_detach_private_data(tz->device->handle);
870 remove_links:
871         acpi_thermal_zone_sysfs_remove(tz);
872 unregister_tzd:
873         thermal_zone_device_unregister(tz->thermal_zone);
874
875         return result;
876 }
877
878 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
879 {
880         acpi_thermal_zone_sysfs_remove(tz);
881         thermal_zone_device_unregister(tz->thermal_zone);
882         tz->thermal_zone = NULL;
883         acpi_bus_detach_private_data(tz->device->handle);
884 }
885
886
887 /* --------------------------------------------------------------------------
888                                  Driver Interface
889    -------------------------------------------------------------------------- */
890
891 static void acpi_queue_thermal_check(struct acpi_thermal *tz)
892 {
893         if (!work_pending(&tz->thermal_check_work))
894                 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
895 }
896
897 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
898 {
899         struct acpi_thermal *tz = acpi_driver_data(device);
900
901         if (!tz)
902                 return;
903
904         switch (event) {
905         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
906                 acpi_queue_thermal_check(tz);
907                 break;
908         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
909                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
910                 acpi_queue_thermal_check(tz);
911                 acpi_bus_generate_netlink_event(device->pnp.device_class,
912                                                 dev_name(&device->dev), event, 0);
913                 break;
914         case ACPI_THERMAL_NOTIFY_DEVICES:
915                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
916                 acpi_queue_thermal_check(tz);
917                 acpi_bus_generate_netlink_event(device->pnp.device_class,
918                                                 dev_name(&device->dev), event, 0);
919                 break;
920         default:
921                 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
922                                   event);
923                 break;
924         }
925 }
926
927 /*
928  * On some platforms, the AML code has dependency about
929  * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
930  * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
931  *    /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
932  * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
933  *    if _TMP has never been evaluated.
934  *
935  * As this dependency is totally transparent to OS, evaluate
936  * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
937  * _TMP, before they are actually used.
938  */
939 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
940 {
941         acpi_handle handle = tz->device->handle;
942         unsigned long long value;
943         int i;
944
945         acpi_evaluate_integer(handle, "_CRT", NULL, &value);
946         acpi_evaluate_integer(handle, "_HOT", NULL, &value);
947         acpi_evaluate_integer(handle, "_PSV", NULL, &value);
948         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
949                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
950                 acpi_status status;
951
952                 status = acpi_evaluate_integer(handle, name, NULL, &value);
953                 if (status == AE_NOT_FOUND)
954                         break;
955         }
956         acpi_evaluate_integer(handle, "_TMP", NULL, &value);
957 }
958
959 static int acpi_thermal_get_info(struct acpi_thermal *tz)
960 {
961         int result;
962
963         if (!tz)
964                 return -EINVAL;
965
966         acpi_thermal_aml_dependency_fix(tz);
967
968         /* Get trip points [_CRT, _PSV, etc.] (required) */
969         result = acpi_thermal_get_trip_points(tz);
970         if (result)
971                 return result;
972
973         /* Get temperature [_TMP] (required) */
974         result = acpi_thermal_get_temperature(tz);
975         if (result)
976                 return result;
977
978         /* Set the cooling mode [_SCP] to active cooling (default) */
979         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
980         if (!result)
981                 tz->flags.cooling_mode = 1;
982
983         /* Get default polling frequency [_TZP] (optional) */
984         if (tzp)
985                 tz->polling_frequency = tzp;
986         else
987                 acpi_thermal_get_polling_frequency(tz);
988
989         return 0;
990 }
991
992 /*
993  * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
994  * handles temperature values with a single decimal place. As a consequence,
995  * some implementations use an offset of 273.1 and others use an offset of
996  * 273.2. Try to find out which one is being used, to present the most
997  * accurate and visually appealing number.
998  *
999  * The heuristic below should work for all ACPI thermal zones which have a
1000  * critical trip point with a value being a multiple of 0.5 degree Celsius.
1001  */
1002 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1003 {
1004         if (tz->trips.critical.flags.valid &&
1005             (tz->trips.critical.temperature % 5) == 1)
1006                 tz->kelvin_offset = 273100;
1007         else
1008                 tz->kelvin_offset = 273200;
1009 }
1010
1011 static void acpi_thermal_check_fn(struct work_struct *work)
1012 {
1013         struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1014                                                thermal_check_work);
1015
1016         /*
1017          * In general, it is not sufficient to check the pending bit, because
1018          * subsequent instances of this function may be queued after one of them
1019          * has started running (e.g. if _TMP sleeps).  Avoid bailing out if just
1020          * one of them is running, though, because it may have done the actual
1021          * check some time ago, so allow at least one of them to block on the
1022          * mutex while another one is running the update.
1023          */
1024         if (!refcount_dec_not_one(&tz->thermal_check_count))
1025                 return;
1026
1027         mutex_lock(&tz->thermal_check_lock);
1028
1029         thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
1030
1031         refcount_inc(&tz->thermal_check_count);
1032
1033         mutex_unlock(&tz->thermal_check_lock);
1034 }
1035
1036 static int acpi_thermal_add(struct acpi_device *device)
1037 {
1038         struct acpi_thermal *tz;
1039         int result;
1040
1041         if (!device)
1042                 return -EINVAL;
1043
1044         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1045         if (!tz)
1046                 return -ENOMEM;
1047
1048         tz->device = device;
1049         strcpy(tz->name, device->pnp.bus_id);
1050         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1051         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1052         device->driver_data = tz;
1053
1054         result = acpi_thermal_get_info(tz);
1055         if (result)
1056                 goto free_memory;
1057
1058         acpi_thermal_guess_offset(tz);
1059
1060         result = acpi_thermal_register_thermal_zone(tz);
1061         if (result)
1062                 goto free_memory;
1063
1064         refcount_set(&tz->thermal_check_count, 3);
1065         mutex_init(&tz->thermal_check_lock);
1066         INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1067
1068         pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
1069                 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature));
1070         goto end;
1071
1072 free_memory:
1073         kfree(tz);
1074 end:
1075         return result;
1076 }
1077
1078 static void acpi_thermal_remove(struct acpi_device *device)
1079 {
1080         struct acpi_thermal *tz;
1081
1082         if (!device || !acpi_driver_data(device))
1083                 return;
1084
1085         flush_workqueue(acpi_thermal_pm_queue);
1086         tz = acpi_driver_data(device);
1087
1088         acpi_thermal_unregister_thermal_zone(tz);
1089         kfree(tz);
1090 }
1091
1092 #ifdef CONFIG_PM_SLEEP
1093 static int acpi_thermal_suspend(struct device *dev)
1094 {
1095         /* Make sure the previously queued thermal check work has been done */
1096         flush_workqueue(acpi_thermal_pm_queue);
1097         return 0;
1098 }
1099
1100 static int acpi_thermal_resume(struct device *dev)
1101 {
1102         struct acpi_thermal *tz;
1103         int i, j, power_state, result;
1104
1105         if (!dev)
1106                 return -EINVAL;
1107
1108         tz = acpi_driver_data(to_acpi_device(dev));
1109         if (!tz)
1110                 return -EINVAL;
1111
1112         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1113                 if (!tz->trips.active[i].flags.valid)
1114                         break;
1115
1116                 tz->trips.active[i].flags.enabled = 1;
1117                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1118                         result = acpi_bus_update_power(
1119                                         tz->trips.active[i].devices.handles[j],
1120                                         &power_state);
1121                         if (result || (power_state != ACPI_STATE_D0)) {
1122                                 tz->trips.active[i].flags.enabled = 0;
1123                                 break;
1124                         }
1125                 }
1126                 tz->state.active |= tz->trips.active[i].flags.enabled;
1127         }
1128
1129         acpi_queue_thermal_check(tz);
1130
1131         return AE_OK;
1132 }
1133 #endif
1134
1135 static int thermal_act(const struct dmi_system_id *d) {
1136         if (act == 0) {
1137                 pr_notice("%s detected: disabling all active thermal trip points\n",
1138                           d->ident);
1139                 act = -1;
1140         }
1141         return 0;
1142 }
1143 static int thermal_nocrt(const struct dmi_system_id *d) {
1144         pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
1145                   d->ident);
1146         nocrt = 1;
1147         return 0;
1148 }
1149 static int thermal_tzp(const struct dmi_system_id *d) {
1150         if (tzp == 0) {
1151                 pr_notice("%s detected: enabling thermal zone polling\n",
1152                           d->ident);
1153                 tzp = 300;      /* 300 dS = 30 Seconds */
1154         }
1155         return 0;
1156 }
1157 static int thermal_psv(const struct dmi_system_id *d) {
1158         if (psv == 0) {
1159                 pr_notice("%s detected: disabling all passive thermal trip points\n",
1160                           d->ident);
1161                 psv = -1;
1162         }
1163         return 0;
1164 }
1165
1166 static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1167         /*
1168          * Award BIOS on this AOpen makes thermal control almost worthless.
1169          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1170          */
1171         {
1172          .callback = thermal_act,
1173          .ident = "AOpen i915GMm-HFS",
1174          .matches = {
1175                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1176                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1177                 },
1178         },
1179         {
1180          .callback = thermal_psv,
1181          .ident = "AOpen i915GMm-HFS",
1182          .matches = {
1183                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1184                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1185                 },
1186         },
1187         {
1188          .callback = thermal_tzp,
1189          .ident = "AOpen i915GMm-HFS",
1190          .matches = {
1191                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1192                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1193                 },
1194         },
1195         {
1196          .callback = thermal_nocrt,
1197          .ident = "Gigabyte GA-7ZX",
1198          .matches = {
1199                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1200                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1201                 },
1202         },
1203         {}
1204 };
1205
1206 static int __init acpi_thermal_init(void)
1207 {
1208         int result;
1209
1210         dmi_check_system(thermal_dmi_table);
1211
1212         if (off) {
1213                 pr_notice("thermal control disabled\n");
1214                 return -ENODEV;
1215         }
1216
1217         acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1218                                                 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1219         if (!acpi_thermal_pm_queue)
1220                 return -ENODEV;
1221
1222         result = acpi_bus_register_driver(&acpi_thermal_driver);
1223         if (result < 0) {
1224                 destroy_workqueue(acpi_thermal_pm_queue);
1225                 return -ENODEV;
1226         }
1227
1228         return 0;
1229 }
1230
1231 static void __exit acpi_thermal_exit(void)
1232 {
1233         acpi_bus_unregister_driver(&acpi_thermal_driver);
1234         destroy_workqueue(acpi_thermal_pm_queue);
1235 }
1236
1237 module_init(acpi_thermal_init);
1238 module_exit(acpi_thermal_exit);