1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
8 * This driver fully implements the ACPI thermal policy as described in the
9 * ACPI 2.0 Specification.
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.
16 #define pr_fmt(fmt) "ACPI: thermal: " fmt
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>
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
43 #define ACPI_THERMAL_MAX_ACTIVE 10
44 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
46 MODULE_AUTHOR("Paul Diefenbaugh");
47 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
48 MODULE_LICENSE("GPL");
51 module_param(act, int, 0644);
52 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
55 module_param(crt, int, 0644);
56 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
59 module_param(tzp, int, 0444);
60 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
63 module_param(nocrt, int, 0);
64 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
67 module_param(off, int, 0);
68 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
71 module_param(psv, int, 0644);
72 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
74 static struct workqueue_struct *acpi_thermal_pm_queue;
76 static int acpi_thermal_add(struct acpi_device *device);
77 static int acpi_thermal_remove(struct acpi_device *device);
78 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
80 static const struct acpi_device_id thermal_device_ids[] = {
81 {ACPI_THERMAL_HID, 0},
84 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
86 #ifdef CONFIG_PM_SLEEP
87 static int acpi_thermal_suspend(struct device *dev);
88 static int acpi_thermal_resume(struct device *dev);
90 #define acpi_thermal_suspend NULL
91 #define acpi_thermal_resume NULL
93 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
95 static struct acpi_driver acpi_thermal_driver = {
97 .class = ACPI_THERMAL_CLASS,
98 .ids = thermal_device_ids,
100 .add = acpi_thermal_add,
101 .remove = acpi_thermal_remove,
102 .notify = acpi_thermal_notify,
104 .drv.pm = &acpi_thermal_pm,
107 struct acpi_thermal_state {
116 struct acpi_thermal_state_flags {
122 struct acpi_thermal_critical {
123 struct acpi_thermal_state_flags flags;
124 unsigned long temperature;
127 struct acpi_thermal_hot {
128 struct acpi_thermal_state_flags flags;
129 unsigned long temperature;
132 struct acpi_thermal_passive {
133 struct acpi_thermal_state_flags flags;
134 unsigned long temperature;
138 struct acpi_handle_list devices;
141 struct acpi_thermal_active {
142 struct acpi_thermal_state_flags flags;
143 unsigned long temperature;
144 struct acpi_handle_list devices;
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];
154 struct acpi_thermal_flags {
155 u8 cooling_mode:1; /* _SCP */
156 u8 devices:1; /* _TZD */
160 struct acpi_thermal {
161 struct acpi_device * device;
163 unsigned long temperature;
164 unsigned long last_temperature;
165 unsigned long polling_frequency;
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;
178 /* --------------------------------------------------------------------------
179 Thermal Zone Management
180 -------------------------------------------------------------------------- */
182 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
184 acpi_status status = AE_OK;
185 unsigned long long tmp;
190 tz->last_temperature = tz->temperature;
192 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
193 if (ACPI_FAILURE(status))
196 tz->temperature = tmp;
198 acpi_handle_debug(tz->device->handle, "Temperature is %lu dK\n",
204 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
206 acpi_status status = AE_OK;
207 unsigned long long tmp;
212 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
213 if (ACPI_FAILURE(status))
216 tz->polling_frequency = tmp;
217 acpi_handle_debug(tz->device->handle, "Polling frequency is %lu dS\n",
218 tz->polling_frequency);
223 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
228 if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
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
241 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
242 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
244 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
245 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
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.
255 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, tz, str) \
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); \
263 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
265 acpi_status status = AE_OK;
266 unsigned long long tmp;
267 struct acpi_handle_list devices;
271 /* Critical Shutdown */
272 if (flag & ACPI_TRIPS_CRITICAL) {
273 status = acpi_evaluate_integer(tz->device->handle,
275 tz->trips.critical.temperature = tmp;
277 * Treat freezing temperatures as invalid as well; some
278 * BIOSes return really low values and cause reboots at startup.
279 * Below zero (Celsius) values clearly aren't right for sure..
280 * ... so lets discard those as invalid.
282 if (ACPI_FAILURE(status)) {
283 tz->trips.critical.flags.valid = 0;
284 acpi_handle_debug(tz->device->handle,
285 "No critical threshold\n");
286 } else if (tmp <= 2732) {
287 pr_info(FW_BUG "Invalid critical threshold (%llu)\n",
289 tz->trips.critical.flags.valid = 0;
291 tz->trips.critical.flags.valid = 1;
292 acpi_handle_debug(tz->device->handle,
293 "Found critical threshold [%lu]\n",
294 tz->trips.critical.temperature);
296 if (tz->trips.critical.flags.valid == 1) {
298 tz->trips.critical.flags.valid = 0;
299 } else if (crt > 0) {
300 unsigned long crt_k = celsius_to_deci_kelvin(crt);
303 * Allow override critical threshold
305 if (crt_k > tz->trips.critical.temperature)
306 pr_info("Critical threshold %d C\n", crt);
308 tz->trips.critical.temperature = crt_k;
313 /* Critical Sleep (optional) */
314 if (flag & ACPI_TRIPS_HOT) {
315 status = acpi_evaluate_integer(tz->device->handle,
317 if (ACPI_FAILURE(status)) {
318 tz->trips.hot.flags.valid = 0;
319 acpi_handle_debug(tz->device->handle,
320 "No hot threshold\n");
322 tz->trips.hot.temperature = tmp;
323 tz->trips.hot.flags.valid = 1;
324 acpi_handle_debug(tz->device->handle,
325 "Found hot threshold [%lu]\n",
326 tz->trips.hot.temperature);
330 /* Passive (optional) */
331 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
332 (flag == ACPI_TRIPS_INIT)) {
333 valid = tz->trips.passive.flags.valid;
336 } else if (psv > 0) {
337 tmp = celsius_to_deci_kelvin(psv);
340 status = acpi_evaluate_integer(tz->device->handle,
344 if (ACPI_FAILURE(status))
345 tz->trips.passive.flags.valid = 0;
347 tz->trips.passive.temperature = tmp;
348 tz->trips.passive.flags.valid = 1;
349 if (flag == ACPI_TRIPS_INIT) {
350 status = acpi_evaluate_integer(
351 tz->device->handle, "_TC1",
353 if (ACPI_FAILURE(status))
354 tz->trips.passive.flags.valid = 0;
356 tz->trips.passive.tc1 = tmp;
357 status = acpi_evaluate_integer(
358 tz->device->handle, "_TC2",
360 if (ACPI_FAILURE(status))
361 tz->trips.passive.flags.valid = 0;
363 tz->trips.passive.tc2 = tmp;
364 status = acpi_evaluate_integer(
365 tz->device->handle, "_TSP",
367 if (ACPI_FAILURE(status))
368 tz->trips.passive.flags.valid = 0;
370 tz->trips.passive.tsp = tmp;
374 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
375 memset(&devices, 0, sizeof(struct acpi_handle_list));
376 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
378 if (ACPI_FAILURE(status)) {
379 acpi_handle_info(tz->device->handle,
380 "Invalid passive threshold\n");
381 tz->trips.passive.flags.valid = 0;
384 tz->trips.passive.flags.valid = 1;
386 if (memcmp(&tz->trips.passive.devices, &devices,
387 sizeof(struct acpi_handle_list))) {
388 memcpy(&tz->trips.passive.devices, &devices,
389 sizeof(struct acpi_handle_list));
390 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
393 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
394 if (valid != tz->trips.passive.flags.valid)
395 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
398 /* Active (optional) */
399 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
400 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
401 valid = tz->trips.active[i].flags.valid;
404 break; /* disable all active trip points */
406 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
407 tz->trips.active[i].flags.valid)) {
408 status = acpi_evaluate_integer(tz->device->handle,
410 if (ACPI_FAILURE(status)) {
411 tz->trips.active[i].flags.valid = 0;
417 tz->trips.active[0].temperature =
418 celsius_to_deci_kelvin(act);
421 * Don't allow override higher than
422 * the next higher trip point
424 tz->trips.active[i - 1].temperature =
425 (tz->trips.active[i - 2].temperature <
426 celsius_to_deci_kelvin(act) ?
427 tz->trips.active[i - 2].temperature :
428 celsius_to_deci_kelvin(act));
431 tz->trips.active[i].temperature = tmp;
432 tz->trips.active[i].flags.valid = 1;
437 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
438 memset(&devices, 0, sizeof(struct acpi_handle_list));
439 status = acpi_evaluate_reference(tz->device->handle,
440 name, NULL, &devices);
441 if (ACPI_FAILURE(status)) {
442 acpi_handle_info(tz->device->handle,
443 "Invalid active%d threshold\n", i);
444 tz->trips.active[i].flags.valid = 0;
447 tz->trips.active[i].flags.valid = 1;
449 if (memcmp(&tz->trips.active[i].devices, &devices,
450 sizeof(struct acpi_handle_list))) {
451 memcpy(&tz->trips.active[i].devices, &devices,
452 sizeof(struct acpi_handle_list));
453 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
456 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
457 if (valid != tz->trips.active[i].flags.valid)
458 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "state");
460 if (!tz->trips.active[i].flags.valid)
464 if (flag & ACPI_TRIPS_DEVICES) {
465 memset(&devices, 0, sizeof(devices));
466 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
468 if (ACPI_SUCCESS(status)
469 && memcmp(&tz->devices, &devices, sizeof(devices))) {
470 tz->devices = devices;
471 ACPI_THERMAL_TRIPS_EXCEPTION(flag, tz, "device");
478 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
480 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
485 valid = tz->trips.critical.flags.valid |
486 tz->trips.hot.flags.valid |
487 tz->trips.passive.flags.valid;
489 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
490 valid |= tz->trips.active[i].flags.valid;
493 pr_warn(FW_BUG "No valid trip found\n");
499 /* sys I/F for generic thermal sysfs support */
501 static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
503 struct acpi_thermal *tz = thermal->devdata;
509 result = acpi_thermal_get_temperature(tz);
513 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temperature,
518 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
519 int trip, enum thermal_trip_type *type)
521 struct acpi_thermal *tz = thermal->devdata;
527 if (tz->trips.critical.flags.valid) {
529 *type = THERMAL_TRIP_CRITICAL;
535 if (tz->trips.hot.flags.valid) {
537 *type = THERMAL_TRIP_HOT;
543 if (tz->trips.passive.flags.valid) {
545 *type = THERMAL_TRIP_PASSIVE;
551 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
552 tz->trips.active[i].flags.valid; i++) {
554 *type = THERMAL_TRIP_ACTIVE;
563 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
566 struct acpi_thermal *tz = thermal->devdata;
572 if (tz->trips.critical.flags.valid) {
574 *temp = deci_kelvin_to_millicelsius_with_offset(
575 tz->trips.critical.temperature,
582 if (tz->trips.hot.flags.valid) {
584 *temp = deci_kelvin_to_millicelsius_with_offset(
585 tz->trips.hot.temperature,
592 if (tz->trips.passive.flags.valid) {
594 *temp = deci_kelvin_to_millicelsius_with_offset(
595 tz->trips.passive.temperature,
602 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
603 tz->trips.active[i].flags.valid; i++) {
605 *temp = deci_kelvin_to_millicelsius_with_offset(
606 tz->trips.active[i].temperature,
616 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
619 struct acpi_thermal *tz = thermal->devdata;
621 if (tz->trips.critical.flags.valid) {
622 *temperature = deci_kelvin_to_millicelsius_with_offset(
623 tz->trips.critical.temperature,
630 static int thermal_get_trend(struct thermal_zone_device *thermal,
631 int trip, enum thermal_trend *trend)
633 struct acpi_thermal *tz = thermal->devdata;
634 enum thermal_trip_type type;
637 if (thermal_get_trip_type(thermal, trip, &type))
640 if (type == THERMAL_TRIP_ACTIVE) {
642 int temp = deci_kelvin_to_millicelsius_with_offset(
643 tz->temperature, tz->kelvin_offset);
644 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
647 if (temp > trip_temp) {
648 *trend = THERMAL_TREND_RAISING;
651 /* Fall back on default trend */
657 * tz->temperature has already been updated by generic thermal layer,
658 * before this callback being invoked
660 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
661 + (tz->trips.passive.tc2
662 * (tz->temperature - tz->trips.passive.temperature));
665 *trend = THERMAL_TREND_RAISING;
667 *trend = THERMAL_TREND_DROPPING;
669 *trend = THERMAL_TREND_STABLE;
673 static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
675 struct acpi_thermal *tz = thermal->devdata;
677 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
678 dev_name(&tz->device->dev),
679 ACPI_THERMAL_NOTIFY_HOT, 1);
682 static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
684 struct acpi_thermal *tz = thermal->devdata;
686 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
687 dev_name(&tz->device->dev),
688 ACPI_THERMAL_NOTIFY_CRITICAL, 1);
690 thermal_zone_device_critical(thermal);
693 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
694 struct thermal_cooling_device *cdev,
697 struct acpi_device *device = cdev->devdata;
698 struct acpi_thermal *tz = thermal->devdata;
699 struct acpi_device *dev;
706 if (tz->trips.critical.flags.valid)
709 if (tz->trips.hot.flags.valid)
712 if (tz->trips.passive.flags.valid) {
714 for (i = 0; i < tz->trips.passive.devices.count;
716 handle = tz->trips.passive.devices.handles[i];
717 dev = acpi_fetch_acpi_dev(handle);
722 thermal_zone_bind_cooling_device
723 (thermal, trip, cdev,
724 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
725 THERMAL_WEIGHT_DEFAULT);
728 thermal_zone_unbind_cooling_device
729 (thermal, trip, cdev);
735 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
736 if (!tz->trips.active[i].flags.valid)
740 j < tz->trips.active[i].devices.count;
742 handle = tz->trips.active[i].devices.handles[j];
743 dev = acpi_fetch_acpi_dev(handle);
747 result = thermal_zone_bind_cooling_device
748 (thermal, trip, cdev,
749 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT,
750 THERMAL_WEIGHT_DEFAULT);
752 result = thermal_zone_unbind_cooling_device
753 (thermal, trip, cdev);
764 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
765 struct thermal_cooling_device *cdev)
767 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
771 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
772 struct thermal_cooling_device *cdev)
774 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
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,
789 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
796 if (tz->trips.critical.flags.valid)
799 if (tz->trips.hot.flags.valid)
802 if (tz->trips.passive.flags.valid)
805 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
806 tz->trips.active[i].flags.valid; i++, trips++);
808 if (tz->trips.passive.flags.valid)
810 thermal_zone_device_register("acpitz", trips, 0, tz,
811 &acpi_thermal_zone_ops, NULL,
812 tz->trips.passive.tsp*100,
813 tz->polling_frequency*100);
816 thermal_zone_device_register("acpitz", trips, 0, tz,
817 &acpi_thermal_zone_ops, NULL,
818 0, tz->polling_frequency*100);
819 if (IS_ERR(tz->thermal_zone))
822 result = sysfs_create_link(&tz->device->dev.kobj,
823 &tz->thermal_zone->device.kobj, "thermal_zone");
827 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
828 &tz->device->dev.kobj, "device");
832 status = acpi_bus_attach_private_data(tz->device->handle,
834 if (ACPI_FAILURE(status)) {
836 goto remove_dev_link;
839 result = thermal_zone_device_enable(tz->thermal_zone);
841 goto acpi_bus_detach;
843 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
844 tz->thermal_zone->id);
849 acpi_bus_detach_private_data(tz->device->handle);
851 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
853 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
855 thermal_zone_device_unregister(tz->thermal_zone);
860 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
862 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
863 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
864 thermal_zone_device_unregister(tz->thermal_zone);
865 tz->thermal_zone = NULL;
866 acpi_bus_detach_private_data(tz->device->handle);
870 /* --------------------------------------------------------------------------
872 -------------------------------------------------------------------------- */
874 static void acpi_queue_thermal_check(struct acpi_thermal *tz)
876 if (!work_pending(&tz->thermal_check_work))
877 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
880 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
882 struct acpi_thermal *tz = acpi_driver_data(device);
889 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
890 acpi_queue_thermal_check(tz);
892 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
893 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
894 acpi_queue_thermal_check(tz);
895 acpi_bus_generate_netlink_event(device->pnp.device_class,
896 dev_name(&device->dev), event, 0);
898 case ACPI_THERMAL_NOTIFY_DEVICES:
899 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
900 acpi_queue_thermal_check(tz);
901 acpi_bus_generate_netlink_event(device->pnp.device_class,
902 dev_name(&device->dev), event, 0);
905 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
912 * On some platforms, the AML code has dependency about
913 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
914 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
915 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
916 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
917 * if _TMP has never been evaluated.
919 * As this dependency is totally transparent to OS, evaluate
920 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
921 * _TMP, before they are actually used.
923 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
925 acpi_handle handle = tz->device->handle;
926 unsigned long long value;
929 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
930 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
931 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
932 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
933 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
936 status = acpi_evaluate_integer(handle, name, NULL, &value);
937 if (status == AE_NOT_FOUND)
940 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
943 static int acpi_thermal_get_info(struct acpi_thermal *tz)
951 acpi_thermal_aml_dependency_fix(tz);
953 /* Get trip points [_CRT, _PSV, etc.] (required) */
954 result = acpi_thermal_get_trip_points(tz);
958 /* Get temperature [_TMP] (required) */
959 result = acpi_thermal_get_temperature(tz);
963 /* Set the cooling mode [_SCP] to active cooling (default) */
964 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
966 tz->flags.cooling_mode = 1;
968 /* Get default polling frequency [_TZP] (optional) */
970 tz->polling_frequency = tzp;
972 acpi_thermal_get_polling_frequency(tz);
978 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
979 * handles temperature values with a single decimal place. As a consequence,
980 * some implementations use an offset of 273.1 and others use an offset of
981 * 273.2. Try to find out which one is being used, to present the most
982 * accurate and visually appealing number.
984 * The heuristic below should work for all ACPI thermal zones which have a
985 * critical trip point with a value being a multiple of 0.5 degree Celsius.
987 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
989 if (tz->trips.critical.flags.valid &&
990 (tz->trips.critical.temperature % 5) == 1)
991 tz->kelvin_offset = 273100;
993 tz->kelvin_offset = 273200;
996 static void acpi_thermal_check_fn(struct work_struct *work)
998 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1002 * In general, it is not sufficient to check the pending bit, because
1003 * subsequent instances of this function may be queued after one of them
1004 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just
1005 * one of them is running, though, because it may have done the actual
1006 * check some time ago, so allow at least one of them to block on the
1007 * mutex while another one is running the update.
1009 if (!refcount_dec_not_one(&tz->thermal_check_count))
1012 mutex_lock(&tz->thermal_check_lock);
1014 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
1016 refcount_inc(&tz->thermal_check_count);
1018 mutex_unlock(&tz->thermal_check_lock);
1021 static int acpi_thermal_add(struct acpi_device *device)
1024 struct acpi_thermal *tz = NULL;
1030 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1034 tz->device = device;
1035 strcpy(tz->name, device->pnp.bus_id);
1036 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1037 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1038 device->driver_data = tz;
1040 result = acpi_thermal_get_info(tz);
1044 acpi_thermal_guess_offset(tz);
1046 result = acpi_thermal_register_thermal_zone(tz);
1050 refcount_set(&tz->thermal_check_count, 3);
1051 mutex_init(&tz->thermal_check_lock);
1052 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1054 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
1055 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature));
1064 static int acpi_thermal_remove(struct acpi_device *device)
1066 struct acpi_thermal *tz = NULL;
1068 if (!device || !acpi_driver_data(device))
1071 flush_workqueue(acpi_thermal_pm_queue);
1072 tz = acpi_driver_data(device);
1074 acpi_thermal_unregister_thermal_zone(tz);
1079 #ifdef CONFIG_PM_SLEEP
1080 static int acpi_thermal_suspend(struct device *dev)
1082 /* Make sure the previously queued thermal check work has been done */
1083 flush_workqueue(acpi_thermal_pm_queue);
1087 static int acpi_thermal_resume(struct device *dev)
1089 struct acpi_thermal *tz;
1090 int i, j, power_state, result;
1095 tz = acpi_driver_data(to_acpi_device(dev));
1099 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1100 if (!tz->trips.active[i].flags.valid)
1102 tz->trips.active[i].flags.enabled = 1;
1103 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1104 result = acpi_bus_update_power(
1105 tz->trips.active[i].devices.handles[j],
1107 if (result || (power_state != ACPI_STATE_D0)) {
1108 tz->trips.active[i].flags.enabled = 0;
1112 tz->state.active |= tz->trips.active[i].flags.enabled;
1115 acpi_queue_thermal_check(tz);
1121 static int thermal_act(const struct dmi_system_id *d) {
1124 pr_notice("%s detected: disabling all active thermal trip points\n",
1130 static int thermal_nocrt(const struct dmi_system_id *d) {
1132 pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
1137 static int thermal_tzp(const struct dmi_system_id *d) {
1140 pr_notice("%s detected: enabling thermal zone polling\n",
1142 tzp = 300; /* 300 dS = 30 Seconds */
1146 static int thermal_psv(const struct dmi_system_id *d) {
1149 pr_notice("%s detected: disabling all passive thermal trip points\n",
1156 static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1158 * Award BIOS on this AOpen makes thermal control almost worthless.
1159 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1162 .callback = thermal_act,
1163 .ident = "AOpen i915GMm-HFS",
1165 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1166 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1170 .callback = thermal_psv,
1171 .ident = "AOpen i915GMm-HFS",
1173 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1174 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1178 .callback = thermal_tzp,
1179 .ident = "AOpen i915GMm-HFS",
1181 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1182 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1186 .callback = thermal_nocrt,
1187 .ident = "Gigabyte GA-7ZX",
1189 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1190 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1196 static int __init acpi_thermal_init(void)
1200 dmi_check_system(thermal_dmi_table);
1203 pr_notice("thermal control disabled\n");
1207 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1208 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1209 if (!acpi_thermal_pm_queue)
1212 result = acpi_bus_register_driver(&acpi_thermal_driver);
1214 destroy_workqueue(acpi_thermal_pm_queue);
1221 static void __exit acpi_thermal_exit(void)
1223 acpi_bus_unregister_driver(&acpi_thermal_driver);
1224 destroy_workqueue(acpi_thermal_pm_queue);
1229 module_init(acpi_thermal_init);
1230 module_exit(acpi_thermal_exit);