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>
36 #define ACPI_THERMAL_CLASS "thermal_zone"
37 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
38 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
39 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
40 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82
41 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
42 #define ACPI_THERMAL_NOTIFY_HOT 0xF1
43 #define ACPI_THERMAL_MODE_ACTIVE 0x00
45 #define ACPI_THERMAL_MAX_ACTIVE 10
46 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
48 #define ACPI_THERMAL_TRIP_PASSIVE (-1)
50 #define ACPI_THERMAL_MAX_NR_TRIPS (ACPI_THERMAL_MAX_ACTIVE + 3)
53 * This exception is thrown out in two cases:
54 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
55 * when re-evaluating the AML code.
56 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
57 * We need to re-bind the cooling devices of a thermal zone when this occurs.
59 #define ACPI_THERMAL_TRIPS_EXCEPTION(tz, str) \
61 acpi_handle_info(tz->device->handle, \
62 "ACPI thermal trip point %s changed\n" \
63 "Please report to linux-acpi@vger.kernel.org\n", str); \
67 module_param(act, int, 0644);
68 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
71 module_param(crt, int, 0644);
72 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
75 module_param(tzp, int, 0444);
76 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
79 module_param(off, int, 0);
80 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
83 module_param(psv, int, 0644);
84 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
86 static struct workqueue_struct *acpi_thermal_pm_queue;
88 struct acpi_thermal_trip {
89 unsigned long temp_dk;
90 struct acpi_handle_list devices;
93 struct acpi_thermal_passive {
94 struct acpi_thermal_trip trip;
100 struct acpi_thermal_active {
101 struct acpi_thermal_trip trip;
104 struct acpi_thermal_trips {
105 struct acpi_thermal_passive passive;
106 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
109 struct acpi_thermal {
110 struct acpi_device *device;
112 unsigned long temp_dk;
113 unsigned long last_temp_dk;
114 unsigned long polling_frequency;
116 struct acpi_thermal_trips trips;
117 struct thermal_zone_device *thermal_zone;
118 int kelvin_offset; /* in millidegrees */
119 struct work_struct thermal_check_work;
120 struct mutex thermal_check_lock;
121 refcount_t thermal_check_count;
124 /* --------------------------------------------------------------------------
125 Thermal Zone Management
126 -------------------------------------------------------------------------- */
128 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
130 acpi_status status = AE_OK;
131 unsigned long long tmp;
136 tz->last_temp_dk = tz->temp_dk;
138 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
139 if (ACPI_FAILURE(status))
144 acpi_handle_debug(tz->device->handle, "Temperature is %lu dK\n",
150 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
152 acpi_status status = AE_OK;
153 unsigned long long tmp;
158 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
159 if (ACPI_FAILURE(status))
162 tz->polling_frequency = tmp;
163 acpi_handle_debug(tz->device->handle, "Polling frequency is %lu dS\n",
164 tz->polling_frequency);
169 static int acpi_thermal_temp(struct acpi_thermal *tz, int temp_deci_k)
171 if (temp_deci_k == THERMAL_TEMP_INVALID)
172 return THERMAL_TEMP_INVALID;
174 return deci_kelvin_to_millicelsius_with_offset(temp_deci_k,
178 static bool acpi_thermal_trip_valid(struct acpi_thermal_trip *acpi_trip)
180 return acpi_trip->temp_dk != THERMAL_TEMP_INVALID;
183 static int active_trip_index(struct acpi_thermal *tz,
184 struct acpi_thermal_trip *acpi_trip)
186 struct acpi_thermal_active *active;
188 active = container_of(acpi_trip, struct acpi_thermal_active, trip);
189 return active - tz->trips.active;
192 static long get_passive_temp(struct acpi_thermal *tz)
196 if (acpi_passive_trip_temp(tz->device, &temp))
197 return THERMAL_TEMP_INVALID;
202 static long get_active_temp(struct acpi_thermal *tz, int index)
206 if (acpi_active_trip_temp(tz->device, index, &temp))
207 return THERMAL_TEMP_INVALID;
210 * If an override has been provided, apply it so there are no active
211 * trips with thresholds greater than the override.
214 unsigned long long override = celsius_to_deci_kelvin(act);
222 static void acpi_thermal_update_trip(struct acpi_thermal *tz,
223 const struct thermal_trip *trip)
225 struct acpi_thermal_trip *acpi_trip = trip->priv;
227 if (trip->type == THERMAL_TRIP_PASSIVE) {
231 acpi_trip->temp_dk = get_passive_temp(tz);
233 int index = active_trip_index(tz, acpi_trip);
235 acpi_trip->temp_dk = get_active_temp(tz, index);
238 if (!acpi_thermal_trip_valid(acpi_trip))
239 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
242 static bool update_trip_devices(struct acpi_thermal *tz,
243 struct acpi_thermal_trip *acpi_trip,
244 int index, bool compare)
246 struct acpi_handle_list devices = { 0 };
247 char method[] = "_PSL";
249 if (index != ACPI_THERMAL_TRIP_PASSIVE) {
252 method[3] = '0' + index;
255 if (!acpi_evaluate_reference(tz->device->handle, method, NULL, &devices)) {
256 acpi_handle_info(tz->device->handle, "%s evaluation failure\n", method);
260 if (acpi_handle_list_equal(&acpi_trip->devices, &devices)) {
261 acpi_handle_list_free(&devices);
266 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "device");
268 acpi_handle_list_replace(&acpi_trip->devices, &devices);
272 static void acpi_thermal_update_trip_devices(struct acpi_thermal *tz,
273 const struct thermal_trip *trip)
275 struct acpi_thermal_trip *acpi_trip = trip->priv;
276 int index = trip->type == THERMAL_TRIP_PASSIVE ?
277 ACPI_THERMAL_TRIP_PASSIVE : active_trip_index(tz, acpi_trip);
279 if (update_trip_devices(tz, acpi_trip, index, true))
282 acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
283 ACPI_THERMAL_TRIPS_EXCEPTION(tz, "state");
286 struct adjust_trip_data {
287 struct acpi_thermal *tz;
291 static int acpi_thermal_adjust_trip(struct thermal_trip *trip, void *data)
293 struct acpi_thermal_trip *acpi_trip = trip->priv;
294 struct adjust_trip_data *atd = data;
295 struct acpi_thermal *tz = atd->tz;
298 if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
301 if (atd->event == ACPI_THERMAL_NOTIFY_THRESHOLDS)
302 acpi_thermal_update_trip(tz, trip);
304 acpi_thermal_update_trip_devices(tz, trip);
306 if (acpi_thermal_trip_valid(acpi_trip))
307 temp = acpi_thermal_temp(tz, acpi_trip->temp_dk);
309 temp = THERMAL_TEMP_INVALID;
311 thermal_zone_set_trip_temp(tz->thermal_zone, trip, temp);
316 static void acpi_queue_thermal_check(struct acpi_thermal *tz)
318 if (!work_pending(&tz->thermal_check_work))
319 queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
322 static void acpi_thermal_trips_update(struct acpi_thermal *tz, u32 event)
324 struct adjust_trip_data atd = { .tz = tz, .event = event };
325 struct acpi_device *adev = tz->device;
328 * Use thermal_zone_for_each_trip() to carry out the trip points
329 * update, so as to protect thermal_get_trend() from getting stale
330 * trip point temperatures and to prevent thermal_zone_device_update()
331 * invoked from acpi_thermal_check_fn() from producing inconsistent
334 thermal_zone_for_each_trip(tz->thermal_zone,
335 acpi_thermal_adjust_trip, &atd);
336 acpi_queue_thermal_check(tz);
337 acpi_bus_generate_netlink_event(adev->pnp.device_class,
338 dev_name(&adev->dev), event, 0);
341 static int acpi_thermal_get_critical_trip(struct acpi_thermal *tz)
346 temp = celsius_to_deci_kelvin(crt);
350 acpi_handle_debug(tz->device->handle, "Critical threshold disabled\n");
351 return THERMAL_TEMP_INVALID;
354 if (acpi_critical_trip_temp(tz->device, &temp))
355 return THERMAL_TEMP_INVALID;
359 * Below zero (Celsius) values clearly aren't right for sure,
360 * so discard them as invalid.
362 pr_info(FW_BUG "Invalid critical threshold (%d)\n", temp);
363 return THERMAL_TEMP_INVALID;
367 acpi_handle_debug(tz->device->handle, "Critical threshold [%d]\n", temp);
371 static int acpi_thermal_get_hot_trip(struct acpi_thermal *tz)
375 if (acpi_hot_trip_temp(tz->device, &temp) || temp == THERMAL_TEMP_INVALID) {
376 acpi_handle_debug(tz->device->handle, "No hot threshold\n");
377 return THERMAL_TEMP_INVALID;
380 acpi_handle_debug(tz->device->handle, "Hot threshold [%d]\n", temp);
384 static bool passive_trip_params_init(struct acpi_thermal *tz)
386 unsigned long long tmp;
389 status = acpi_evaluate_integer(tz->device->handle, "_TC1", NULL, &tmp);
390 if (ACPI_FAILURE(status))
393 tz->trips.passive.tc1 = tmp;
395 status = acpi_evaluate_integer(tz->device->handle, "_TC2", NULL, &tmp);
396 if (ACPI_FAILURE(status))
399 tz->trips.passive.tc2 = tmp;
401 status = acpi_evaluate_integer(tz->device->handle, "_TFP", NULL, &tmp);
402 if (ACPI_SUCCESS(status)) {
403 tz->trips.passive.delay = tmp;
407 status = acpi_evaluate_integer(tz->device->handle, "_TSP", NULL, &tmp);
408 if (ACPI_FAILURE(status))
411 tz->trips.passive.delay = tmp * 100;
416 static bool acpi_thermal_init_trip(struct acpi_thermal *tz, int index)
418 struct acpi_thermal_trip *acpi_trip;
421 if (index == ACPI_THERMAL_TRIP_PASSIVE) {
422 acpi_trip = &tz->trips.passive.trip;
427 if (!passive_trip_params_init(tz))
430 temp = psv > 0 ? celsius_to_deci_kelvin(psv) :
431 get_passive_temp(tz);
433 acpi_trip = &tz->trips.active[index].trip;
438 temp = get_active_temp(tz, index);
441 if (temp == THERMAL_TEMP_INVALID)
444 if (!update_trip_devices(tz, acpi_trip, index, false))
447 acpi_trip->temp_dk = temp;
451 acpi_trip->temp_dk = THERMAL_TEMP_INVALID;
455 static void acpi_thermal_get_trip_points(struct acpi_thermal *tz)
459 acpi_thermal_init_trip(tz, ACPI_THERMAL_TRIP_PASSIVE);
461 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
462 if (!acpi_thermal_init_trip(tz, i))
466 while (++i < ACPI_THERMAL_MAX_ACTIVE)
467 tz->trips.active[i].trip.temp_dk = THERMAL_TEMP_INVALID;
470 /* sys I/F for generic thermal sysfs support */
472 static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
474 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
480 result = acpi_thermal_get_temperature(tz);
484 *temp = deci_kelvin_to_millicelsius_with_offset(tz->temp_dk,
489 static int thermal_get_trend(struct thermal_zone_device *thermal,
490 const struct thermal_trip *trip,
491 enum thermal_trend *trend)
493 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
494 struct acpi_thermal_trip *acpi_trip;
500 acpi_trip = trip->priv;
501 if (!acpi_trip || !acpi_thermal_trip_valid(acpi_trip))
504 switch (trip->type) {
505 case THERMAL_TRIP_PASSIVE:
506 t = tz->trips.passive.tc1 * (tz->temp_dk -
508 tz->trips.passive.tc2 * (tz->temp_dk -
511 *trend = THERMAL_TREND_RAISING;
513 *trend = THERMAL_TREND_DROPPING;
515 *trend = THERMAL_TREND_STABLE;
519 case THERMAL_TRIP_ACTIVE:
520 t = acpi_thermal_temp(tz, tz->temp_dk);
521 if (t <= trip->temperature)
524 *trend = THERMAL_TREND_RAISING;
535 static void acpi_thermal_zone_device_hot(struct thermal_zone_device *thermal)
537 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
539 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
540 dev_name(&tz->device->dev),
541 ACPI_THERMAL_NOTIFY_HOT, 1);
544 static void acpi_thermal_zone_device_critical(struct thermal_zone_device *thermal)
546 struct acpi_thermal *tz = thermal_zone_device_priv(thermal);
548 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
549 dev_name(&tz->device->dev),
550 ACPI_THERMAL_NOTIFY_CRITICAL, 1);
552 thermal_zone_device_critical(thermal);
555 struct acpi_thermal_bind_data {
556 struct thermal_zone_device *thermal;
557 struct thermal_cooling_device *cdev;
561 static int bind_unbind_cdev_cb(struct thermal_trip *trip, void *arg)
563 struct acpi_thermal_trip *acpi_trip = trip->priv;
564 struct acpi_thermal_bind_data *bd = arg;
565 struct thermal_zone_device *thermal = bd->thermal;
566 struct thermal_cooling_device *cdev = bd->cdev;
567 struct acpi_device *cdev_adev = cdev->devdata;
570 /* Skip critical and hot trips. */
574 for (i = 0; i < acpi_trip->devices.count; i++) {
575 acpi_handle handle = acpi_trip->devices.handles[i];
576 struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
578 if (adev != cdev_adev)
584 ret = thermal_bind_cdev_to_trip(thermal, trip, cdev,
587 THERMAL_WEIGHT_DEFAULT);
591 thermal_unbind_cdev_from_trip(thermal, trip, cdev);
598 static int acpi_thermal_bind_unbind_cdev(struct thermal_zone_device *thermal,
599 struct thermal_cooling_device *cdev,
602 struct acpi_thermal_bind_data bd = {
603 .thermal = thermal, .cdev = cdev, .bind = bind
606 return for_each_thermal_trip(thermal, bind_unbind_cdev_cb, &bd);
610 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
611 struct thermal_cooling_device *cdev)
613 return acpi_thermal_bind_unbind_cdev(thermal, cdev, true);
617 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
618 struct thermal_cooling_device *cdev)
620 return acpi_thermal_bind_unbind_cdev(thermal, cdev, false);
623 static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
624 .bind = acpi_thermal_bind_cooling_device,
625 .unbind = acpi_thermal_unbind_cooling_device,
626 .get_temp = thermal_get_temp,
627 .get_trend = thermal_get_trend,
628 .hot = acpi_thermal_zone_device_hot,
629 .critical = acpi_thermal_zone_device_critical,
632 static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz)
634 struct device *tzdev = thermal_zone_device(tz->thermal_zone);
637 ret = sysfs_create_link(&tz->device->dev.kobj,
638 &tzdev->kobj, "thermal_zone");
642 ret = sysfs_create_link(&tzdev->kobj,
643 &tz->device->dev.kobj, "device");
645 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
650 static void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz)
652 struct device *tzdev = thermal_zone_device(tz->thermal_zone);
654 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
655 sysfs_remove_link(&tzdev->kobj, "device");
658 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz,
659 const struct thermal_trip *trip_table,
660 unsigned int trip_count,
665 tz->thermal_zone = thermal_zone_device_register_with_trips("acpitz",
669 &acpi_thermal_zone_ops,
672 tz->polling_frequency * 100);
673 if (IS_ERR(tz->thermal_zone))
674 return PTR_ERR(tz->thermal_zone);
676 result = acpi_thermal_zone_sysfs_add(tz);
680 result = thermal_zone_device_enable(tz->thermal_zone);
684 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
685 thermal_zone_device_id(tz->thermal_zone));
690 acpi_thermal_zone_sysfs_remove(tz);
692 thermal_zone_device_unregister(tz->thermal_zone);
697 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
699 thermal_zone_device_disable(tz->thermal_zone);
700 acpi_thermal_zone_sysfs_remove(tz);
701 thermal_zone_device_unregister(tz->thermal_zone);
702 tz->thermal_zone = NULL;
706 /* --------------------------------------------------------------------------
708 -------------------------------------------------------------------------- */
710 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
712 struct acpi_device *device = data;
713 struct acpi_thermal *tz = acpi_driver_data(device);
719 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
720 acpi_queue_thermal_check(tz);
722 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
723 case ACPI_THERMAL_NOTIFY_DEVICES:
724 acpi_thermal_trips_update(tz, event);
727 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n",
734 * On some platforms, the AML code has dependency about
735 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
736 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
737 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
738 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
739 * if _TMP has never been evaluated.
741 * As this dependency is totally transparent to OS, evaluate
742 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
743 * _TMP, before they are actually used.
745 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
747 acpi_handle handle = tz->device->handle;
748 unsigned long long value;
751 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
752 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
753 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
754 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
755 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
758 status = acpi_evaluate_integer(handle, name, NULL, &value);
759 if (status == AE_NOT_FOUND)
762 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
766 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
767 * handles temperature values with a single decimal place. As a consequence,
768 * some implementations use an offset of 273.1 and others use an offset of
769 * 273.2. Try to find out which one is being used, to present the most
770 * accurate and visually appealing number.
772 * The heuristic below should work for all ACPI thermal zones which have a
773 * critical trip point with a value being a multiple of 0.5 degree Celsius.
775 static void acpi_thermal_guess_offset(struct acpi_thermal *tz, long crit_temp)
777 if (crit_temp != THERMAL_TEMP_INVALID && crit_temp % 5 == 1)
778 tz->kelvin_offset = 273100;
780 tz->kelvin_offset = 273200;
783 static void acpi_thermal_check_fn(struct work_struct *work)
785 struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
789 * In general, it is not sufficient to check the pending bit, because
790 * subsequent instances of this function may be queued after one of them
791 * has started running (e.g. if _TMP sleeps). Avoid bailing out if just
792 * one of them is running, though, because it may have done the actual
793 * check some time ago, so allow at least one of them to block on the
794 * mutex while another one is running the update.
796 if (!refcount_dec_not_one(&tz->thermal_check_count))
799 mutex_lock(&tz->thermal_check_lock);
801 thermal_zone_device_update(tz->thermal_zone, THERMAL_EVENT_UNSPECIFIED);
803 refcount_inc(&tz->thermal_check_count);
805 mutex_unlock(&tz->thermal_check_lock);
808 static void acpi_thermal_free_thermal_zone(struct acpi_thermal *tz)
812 acpi_handle_list_free(&tz->trips.passive.trip.devices);
813 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
814 acpi_handle_list_free(&tz->trips.active[i].trip.devices);
819 static int acpi_thermal_add(struct acpi_device *device)
821 struct thermal_trip trip_table[ACPI_THERMAL_MAX_NR_TRIPS] = { 0 };
822 struct acpi_thermal_trip *acpi_trip;
823 struct thermal_trip *trip;
824 struct acpi_thermal *tz;
825 int crit_temp, hot_temp;
826 int passive_delay = 0;
833 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
838 strcpy(tz->name, device->pnp.bus_id);
839 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
840 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
841 device->driver_data = tz;
843 acpi_thermal_aml_dependency_fix(tz);
845 /* Get trip points [_CRT, _PSV, etc.] (required). */
846 acpi_thermal_get_trip_points(tz);
848 crit_temp = acpi_thermal_get_critical_trip(tz);
849 hot_temp = acpi_thermal_get_hot_trip(tz);
851 /* Get temperature [_TMP] (required). */
852 result = acpi_thermal_get_temperature(tz);
856 /* Set the cooling mode [_SCP] to active cooling. */
857 acpi_execute_simple_method(tz->device->handle, "_SCP",
858 ACPI_THERMAL_MODE_ACTIVE);
860 /* Determine the default polling frequency [_TZP]. */
862 tz->polling_frequency = tzp;
864 acpi_thermal_get_polling_frequency(tz);
866 acpi_thermal_guess_offset(tz, crit_temp);
870 if (crit_temp != THERMAL_TEMP_INVALID) {
871 trip->type = THERMAL_TRIP_CRITICAL;
872 trip->temperature = acpi_thermal_temp(tz, crit_temp);
876 if (hot_temp != THERMAL_TEMP_INVALID) {
877 trip->type = THERMAL_TRIP_HOT;
878 trip->temperature = acpi_thermal_temp(tz, hot_temp);
882 acpi_trip = &tz->trips.passive.trip;
883 if (acpi_thermal_trip_valid(acpi_trip)) {
884 passive_delay = tz->trips.passive.delay;
886 trip->type = THERMAL_TRIP_PASSIVE;
887 trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
888 trip->priv = acpi_trip;
892 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
893 acpi_trip = &tz->trips.active[i].trip;
895 if (!acpi_thermal_trip_valid(acpi_trip))
898 trip->type = THERMAL_TRIP_ACTIVE;
899 trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
900 trip->priv = acpi_trip;
904 if (trip == trip_table) {
905 pr_warn(FW_BUG "No valid trip points!\n");
910 result = acpi_thermal_register_thermal_zone(tz, trip_table,
916 refcount_set(&tz->thermal_check_count, 3);
917 mutex_init(&tz->thermal_check_lock);
918 INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
920 pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
921 acpi_device_bid(device), deci_kelvin_to_celsius(tz->temp_dk));
923 result = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
924 acpi_thermal_notify, device);
931 flush_workqueue(acpi_thermal_pm_queue);
932 acpi_thermal_unregister_thermal_zone(tz);
934 acpi_thermal_free_thermal_zone(tz);
939 static void acpi_thermal_remove(struct acpi_device *device)
941 struct acpi_thermal *tz;
943 if (!device || !acpi_driver_data(device))
946 tz = acpi_driver_data(device);
948 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
949 acpi_thermal_notify);
951 flush_workqueue(acpi_thermal_pm_queue);
952 acpi_thermal_unregister_thermal_zone(tz);
953 acpi_thermal_free_thermal_zone(tz);
956 #ifdef CONFIG_PM_SLEEP
957 static int acpi_thermal_suspend(struct device *dev)
959 /* Make sure the previously queued thermal check work has been done */
960 flush_workqueue(acpi_thermal_pm_queue);
964 static int acpi_thermal_resume(struct device *dev)
966 struct acpi_thermal *tz;
967 int i, j, power_state;
972 tz = acpi_driver_data(to_acpi_device(dev));
976 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
977 struct acpi_thermal_trip *acpi_trip = &tz->trips.active[i].trip;
979 if (!acpi_thermal_trip_valid(acpi_trip))
982 for (j = 0; j < acpi_trip->devices.count; j++) {
983 acpi_bus_update_power(acpi_trip->devices.handles[j],
988 acpi_queue_thermal_check(tz);
993 #define acpi_thermal_suspend NULL
994 #define acpi_thermal_resume NULL
996 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
998 static const struct acpi_device_id thermal_device_ids[] = {
999 {ACPI_THERMAL_HID, 0},
1002 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
1004 static struct acpi_driver acpi_thermal_driver = {
1006 .class = ACPI_THERMAL_CLASS,
1007 .ids = thermal_device_ids,
1009 .add = acpi_thermal_add,
1010 .remove = acpi_thermal_remove,
1012 .drv.pm = &acpi_thermal_pm,
1015 static int thermal_act(const struct dmi_system_id *d)
1018 pr_notice("%s detected: disabling all active thermal trip points\n",
1025 static int thermal_nocrt(const struct dmi_system_id *d)
1027 pr_notice("%s detected: disabling all critical thermal trip point actions.\n",
1033 static int thermal_tzp(const struct dmi_system_id *d)
1036 pr_notice("%s detected: enabling thermal zone polling\n",
1038 tzp = 300; /* 300 dS = 30 Seconds */
1043 static int thermal_psv(const struct dmi_system_id *d)
1046 pr_notice("%s detected: disabling all passive thermal trip points\n",
1053 static const struct dmi_system_id thermal_dmi_table[] __initconst = {
1055 * Award BIOS on this AOpen makes thermal control almost worthless.
1056 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1059 .callback = thermal_act,
1060 .ident = "AOpen i915GMm-HFS",
1062 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1063 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1067 .callback = thermal_psv,
1068 .ident = "AOpen i915GMm-HFS",
1070 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1071 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1075 .callback = thermal_tzp,
1076 .ident = "AOpen i915GMm-HFS",
1078 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1079 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1083 .callback = thermal_nocrt,
1084 .ident = "Gigabyte GA-7ZX",
1086 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1087 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1093 static int __init acpi_thermal_init(void)
1097 dmi_check_system(thermal_dmi_table);
1100 pr_notice("thermal control disabled\n");
1104 acpi_thermal_pm_queue = alloc_workqueue("acpi_thermal_pm",
1105 WQ_HIGHPRI | WQ_MEM_RECLAIM, 0);
1106 if (!acpi_thermal_pm_queue)
1109 result = acpi_bus_register_driver(&acpi_thermal_driver);
1111 destroy_workqueue(acpi_thermal_pm_queue);
1118 static void __exit acpi_thermal_exit(void)
1120 acpi_bus_unregister_driver(&acpi_thermal_driver);
1121 destroy_workqueue(acpi_thermal_pm_queue);
1124 module_init(acpi_thermal_init);
1125 module_exit(acpi_thermal_exit);
1127 MODULE_IMPORT_NS(ACPI_THERMAL);
1128 MODULE_AUTHOR("Paul Diefenbaugh");
1129 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
1130 MODULE_LICENSE("GPL");