2 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 * This driver fully implements the ACPI thermal policy as described in the
26 * ACPI 2.0 Specification.
28 * TBD: 1. Implement passive cooling hysteresis.
29 * 2. Enhance passive cooling (CPU) states/limit interface to support
30 * concepts of 'multiple limiters', upper/lower limits, etc.
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/dmi.h>
37 #include <linux/init.h>
38 #include <linux/slab.h>
39 #include <linux/types.h>
40 #include <linux/jiffies.h>
41 #include <linux/kmod.h>
42 #include <linux/reboot.h>
43 #include <linux/device.h>
44 #include <asm/uaccess.h>
45 #include <linux/thermal.h>
46 #include <acpi/acpi_bus.h>
47 #include <acpi/acpi_drivers.h>
49 #define PREFIX "ACPI: "
51 #define ACPI_THERMAL_CLASS "thermal_zone"
52 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
53 #define ACPI_THERMAL_FILE_STATE "state"
54 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
55 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
56 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
57 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
58 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
59 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
60 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82
61 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
62 #define ACPI_THERMAL_NOTIFY_HOT 0xF1
63 #define ACPI_THERMAL_MODE_ACTIVE 0x00
65 #define ACPI_THERMAL_MAX_ACTIVE 10
66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
68 #define _COMPONENT ACPI_THERMAL_COMPONENT
69 ACPI_MODULE_NAME("thermal");
71 MODULE_AUTHOR("Paul Diefenbaugh");
72 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
73 MODULE_LICENSE("GPL");
76 module_param(act, int, 0644);
77 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
80 module_param(crt, int, 0644);
81 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
84 module_param(tzp, int, 0444);
85 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
88 module_param(nocrt, int, 0);
89 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
92 module_param(off, int, 0);
93 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
96 module_param(psv, int, 0644);
97 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
99 static int acpi_thermal_add(struct acpi_device *device);
100 static int acpi_thermal_remove(struct acpi_device *device, int type);
101 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
103 static const struct acpi_device_id thermal_device_ids[] = {
104 {ACPI_THERMAL_HID, 0},
107 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
109 static int acpi_thermal_resume(struct device *dev);
110 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, NULL, acpi_thermal_resume);
112 static struct acpi_driver acpi_thermal_driver = {
114 .class = ACPI_THERMAL_CLASS,
115 .ids = thermal_device_ids,
117 .add = acpi_thermal_add,
118 .remove = acpi_thermal_remove,
119 .notify = acpi_thermal_notify,
121 .drv.pm = &acpi_thermal_pm,
124 struct acpi_thermal_state {
133 struct acpi_thermal_state_flags {
139 struct acpi_thermal_critical {
140 struct acpi_thermal_state_flags flags;
141 unsigned long temperature;
144 struct acpi_thermal_hot {
145 struct acpi_thermal_state_flags flags;
146 unsigned long temperature;
149 struct acpi_thermal_passive {
150 struct acpi_thermal_state_flags flags;
151 unsigned long temperature;
155 struct acpi_handle_list devices;
158 struct acpi_thermal_active {
159 struct acpi_thermal_state_flags flags;
160 unsigned long temperature;
161 struct acpi_handle_list devices;
164 struct acpi_thermal_trips {
165 struct acpi_thermal_critical critical;
166 struct acpi_thermal_hot hot;
167 struct acpi_thermal_passive passive;
168 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
171 struct acpi_thermal_flags {
172 u8 cooling_mode:1; /* _SCP */
173 u8 devices:1; /* _TZD */
177 struct acpi_thermal {
178 struct acpi_device * device;
180 unsigned long temperature;
181 unsigned long last_temperature;
182 unsigned long polling_frequency;
184 struct acpi_thermal_flags flags;
185 struct acpi_thermal_state state;
186 struct acpi_thermal_trips trips;
187 struct acpi_handle_list devices;
188 struct thermal_zone_device *thermal_zone;
194 /* --------------------------------------------------------------------------
195 Thermal Zone Management
196 -------------------------------------------------------------------------- */
198 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
200 acpi_status status = AE_OK;
201 unsigned long long tmp;
206 tz->last_temperature = tz->temperature;
208 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
209 if (ACPI_FAILURE(status))
212 tz->temperature = tmp;
213 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
219 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
221 acpi_status status = AE_OK;
222 unsigned long long tmp;
227 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
228 if (ACPI_FAILURE(status))
231 tz->polling_frequency = tmp;
232 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
233 tz->polling_frequency));
238 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
240 acpi_status status = AE_OK;
241 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
242 struct acpi_object_list arg_list = { 1, &arg0 };
243 acpi_handle handle = NULL;
249 status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
250 if (ACPI_FAILURE(status)) {
251 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
255 arg0.integer.value = mode;
257 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
258 if (ACPI_FAILURE(status))
264 #define ACPI_TRIPS_CRITICAL 0x01
265 #define ACPI_TRIPS_HOT 0x02
266 #define ACPI_TRIPS_PASSIVE 0x04
267 #define ACPI_TRIPS_ACTIVE 0x08
268 #define ACPI_TRIPS_DEVICES 0x10
270 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
271 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
273 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
274 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
278 * This exception is thrown out in two cases:
279 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
280 * when re-evaluating the AML code.
281 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
282 * We need to re-bind the cooling devices of a thermal zone when this occurs.
284 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
286 if (flags != ACPI_TRIPS_INIT) \
287 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
288 "ACPI thermal trip point %s changed\n" \
289 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
292 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
294 acpi_status status = AE_OK;
295 unsigned long long tmp;
296 struct acpi_handle_list devices;
300 /* Critical Shutdown */
301 if (flag & ACPI_TRIPS_CRITICAL) {
302 status = acpi_evaluate_integer(tz->device->handle,
304 tz->trips.critical.temperature = tmp;
306 * Treat freezing temperatures as invalid as well; some
307 * BIOSes return really low values and cause reboots at startup.
308 * Below zero (Celsius) values clearly aren't right for sure..
309 * ... so lets discard those as invalid.
311 if (ACPI_FAILURE(status)) {
312 tz->trips.critical.flags.valid = 0;
313 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
314 "No critical threshold\n"));
315 } else if (tmp <= 2732) {
316 printk(KERN_WARNING FW_BUG "Invalid critical threshold "
318 tz->trips.critical.flags.valid = 0;
320 tz->trips.critical.flags.valid = 1;
321 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
322 "Found critical threshold [%lu]\n",
323 tz->trips.critical.temperature));
325 if (tz->trips.critical.flags.valid == 1) {
327 tz->trips.critical.flags.valid = 0;
328 } else if (crt > 0) {
329 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
331 * Allow override critical threshold
333 if (crt_k > tz->trips.critical.temperature)
334 printk(KERN_WARNING PREFIX
335 "Critical threshold %d C\n", crt);
336 tz->trips.critical.temperature = crt_k;
341 /* Critical Sleep (optional) */
342 if (flag & ACPI_TRIPS_HOT) {
343 status = acpi_evaluate_integer(tz->device->handle,
345 if (ACPI_FAILURE(status)) {
346 tz->trips.hot.flags.valid = 0;
347 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
348 "No hot threshold\n"));
350 tz->trips.hot.temperature = tmp;
351 tz->trips.hot.flags.valid = 1;
352 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
353 "Found hot threshold [%lu]\n",
354 tz->trips.critical.temperature));
358 /* Passive (optional) */
359 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
360 (flag == ACPI_TRIPS_INIT)) {
361 valid = tz->trips.passive.flags.valid;
364 } else if (psv > 0) {
365 tmp = CELSIUS_TO_KELVIN(psv);
368 status = acpi_evaluate_integer(tz->device->handle,
372 if (ACPI_FAILURE(status))
373 tz->trips.passive.flags.valid = 0;
375 tz->trips.passive.temperature = tmp;
376 tz->trips.passive.flags.valid = 1;
377 if (flag == ACPI_TRIPS_INIT) {
378 status = acpi_evaluate_integer(
379 tz->device->handle, "_TC1",
381 if (ACPI_FAILURE(status))
382 tz->trips.passive.flags.valid = 0;
384 tz->trips.passive.tc1 = tmp;
385 status = acpi_evaluate_integer(
386 tz->device->handle, "_TC2",
388 if (ACPI_FAILURE(status))
389 tz->trips.passive.flags.valid = 0;
391 tz->trips.passive.tc2 = tmp;
392 status = acpi_evaluate_integer(
393 tz->device->handle, "_TSP",
395 if (ACPI_FAILURE(status))
396 tz->trips.passive.flags.valid = 0;
398 tz->trips.passive.tsp = tmp;
402 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
403 memset(&devices, 0, sizeof(struct acpi_handle_list));
404 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
406 if (ACPI_FAILURE(status)) {
407 printk(KERN_WARNING PREFIX
408 "Invalid passive threshold\n");
409 tz->trips.passive.flags.valid = 0;
412 tz->trips.passive.flags.valid = 1;
414 if (memcmp(&tz->trips.passive.devices, &devices,
415 sizeof(struct acpi_handle_list))) {
416 memcpy(&tz->trips.passive.devices, &devices,
417 sizeof(struct acpi_handle_list));
418 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
421 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
422 if (valid != tz->trips.passive.flags.valid)
423 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
426 /* Active (optional) */
427 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
428 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
429 valid = tz->trips.active[i].flags.valid;
432 break; /* disable all active trip points */
434 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
435 tz->trips.active[i].flags.valid)) {
436 status = acpi_evaluate_integer(tz->device->handle,
438 if (ACPI_FAILURE(status)) {
439 tz->trips.active[i].flags.valid = 0;
445 tz->trips.active[0].temperature =
446 CELSIUS_TO_KELVIN(act);
449 * Don't allow override higher than
450 * the next higher trip point
452 tz->trips.active[i - 1].temperature =
453 (tz->trips.active[i - 2].temperature <
454 CELSIUS_TO_KELVIN(act) ?
455 tz->trips.active[i - 2].temperature :
456 CELSIUS_TO_KELVIN(act));
459 tz->trips.active[i].temperature = tmp;
460 tz->trips.active[i].flags.valid = 1;
465 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
466 memset(&devices, 0, sizeof(struct acpi_handle_list));
467 status = acpi_evaluate_reference(tz->device->handle,
468 name, NULL, &devices);
469 if (ACPI_FAILURE(status)) {
470 printk(KERN_WARNING PREFIX
471 "Invalid active%d threshold\n", i);
472 tz->trips.active[i].flags.valid = 0;
475 tz->trips.active[i].flags.valid = 1;
477 if (memcmp(&tz->trips.active[i].devices, &devices,
478 sizeof(struct acpi_handle_list))) {
479 memcpy(&tz->trips.active[i].devices, &devices,
480 sizeof(struct acpi_handle_list));
481 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
484 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
485 if (valid != tz->trips.active[i].flags.valid)
486 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
488 if (!tz->trips.active[i].flags.valid)
492 if (flag & ACPI_TRIPS_DEVICES) {
493 memset(&devices, 0, sizeof(struct acpi_handle_list));
494 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
496 if (memcmp(&tz->devices, &devices,
497 sizeof(struct acpi_handle_list))) {
498 memcpy(&tz->devices, &devices,
499 sizeof(struct acpi_handle_list));
500 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
507 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
509 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
514 valid = tz->trips.critical.flags.valid |
515 tz->trips.hot.flags.valid |
516 tz->trips.passive.flags.valid;
518 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
519 valid |= tz->trips.active[i].flags.valid;
522 printk(KERN_WARNING FW_BUG "No valid trip found\n");
528 static void acpi_thermal_check(void *data)
530 struct acpi_thermal *tz = data;
532 thermal_zone_device_update(tz->thermal_zone);
535 /* sys I/F for generic thermal sysfs support */
536 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
538 static int thermal_get_temp(struct thermal_zone_device *thermal,
541 struct acpi_thermal *tz = thermal->devdata;
547 result = acpi_thermal_get_temperature(tz);
551 *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
555 static const char enabled[] = "kernel";
556 static const char disabled[] = "user";
557 static int thermal_get_mode(struct thermal_zone_device *thermal,
558 enum thermal_device_mode *mode)
560 struct acpi_thermal *tz = thermal->devdata;
565 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
566 THERMAL_DEVICE_DISABLED;
571 static int thermal_set_mode(struct thermal_zone_device *thermal,
572 enum thermal_device_mode mode)
574 struct acpi_thermal *tz = thermal->devdata;
581 * enable/disable thermal management from ACPI thermal driver
583 if (mode == THERMAL_DEVICE_ENABLED)
585 else if (mode == THERMAL_DEVICE_DISABLED)
590 if (enable != tz->tz_enabled) {
591 tz->tz_enabled = enable;
592 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
593 "%s ACPI thermal control\n",
594 tz->tz_enabled ? enabled : disabled));
595 acpi_thermal_check(tz);
600 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
601 int trip, enum thermal_trip_type *type)
603 struct acpi_thermal *tz = thermal->devdata;
609 if (tz->trips.critical.flags.valid) {
611 *type = THERMAL_TRIP_CRITICAL;
617 if (tz->trips.hot.flags.valid) {
619 *type = THERMAL_TRIP_HOT;
625 if (tz->trips.passive.flags.valid) {
627 *type = THERMAL_TRIP_PASSIVE;
633 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
634 tz->trips.active[i].flags.valid; i++) {
636 *type = THERMAL_TRIP_ACTIVE;
645 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
646 int trip, unsigned long *temp)
648 struct acpi_thermal *tz = thermal->devdata;
654 if (tz->trips.critical.flags.valid) {
656 *temp = KELVIN_TO_MILLICELSIUS(
657 tz->trips.critical.temperature,
664 if (tz->trips.hot.flags.valid) {
666 *temp = KELVIN_TO_MILLICELSIUS(
667 tz->trips.hot.temperature,
674 if (tz->trips.passive.flags.valid) {
676 *temp = KELVIN_TO_MILLICELSIUS(
677 tz->trips.passive.temperature,
684 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
685 tz->trips.active[i].flags.valid; i++) {
687 *temp = KELVIN_TO_MILLICELSIUS(
688 tz->trips.active[i].temperature,
698 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
699 unsigned long *temperature) {
700 struct acpi_thermal *tz = thermal->devdata;
702 if (tz->trips.critical.flags.valid) {
703 *temperature = KELVIN_TO_MILLICELSIUS(
704 tz->trips.critical.temperature,
711 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
712 enum thermal_trip_type trip_type)
715 struct acpi_thermal *tz = thermal->devdata;
717 if (trip_type == THERMAL_TRIP_CRITICAL)
718 type = ACPI_THERMAL_NOTIFY_CRITICAL;
719 else if (trip_type == THERMAL_TRIP_HOT)
720 type = ACPI_THERMAL_NOTIFY_HOT;
724 acpi_bus_generate_proc_event(tz->device, type, 1);
725 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
726 dev_name(&tz->device->dev), type, 1);
728 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
734 typedef int (*cb)(struct thermal_zone_device *, int,
735 struct thermal_cooling_device *);
736 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
737 struct thermal_cooling_device *cdev,
740 struct acpi_device *device = cdev->devdata;
741 struct acpi_thermal *tz = thermal->devdata;
742 struct acpi_device *dev;
750 if (tz->trips.critical.flags.valid)
753 if (tz->trips.hot.flags.valid)
756 if (tz->trips.passive.flags.valid) {
758 for (i = 0; i < tz->trips.passive.devices.count;
760 handle = tz->trips.passive.devices.handles[i];
761 status = acpi_bus_get_device(handle, &dev);
762 if (ACPI_SUCCESS(status) && (dev == device)) {
763 result = action(thermal, trip, cdev);
770 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
771 if (!tz->trips.active[i].flags.valid)
775 j < tz->trips.active[i].devices.count;
777 handle = tz->trips.active[i].devices.handles[j];
778 status = acpi_bus_get_device(handle, &dev);
779 if (ACPI_SUCCESS(status) && (dev == device)) {
780 result = action(thermal, trip, cdev);
787 for (i = 0; i < tz->devices.count; i++) {
788 handle = tz->devices.handles[i];
789 status = acpi_bus_get_device(handle, &dev);
790 if (ACPI_SUCCESS(status) && (dev == device)) {
791 result = action(thermal, -1, cdev);
802 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
803 struct thermal_cooling_device *cdev)
805 return acpi_thermal_cooling_device_cb(thermal, cdev,
806 thermal_zone_bind_cooling_device);
810 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
811 struct thermal_cooling_device *cdev)
813 return acpi_thermal_cooling_device_cb(thermal, cdev,
814 thermal_zone_unbind_cooling_device);
817 static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
818 .bind = acpi_thermal_bind_cooling_device,
819 .unbind = acpi_thermal_unbind_cooling_device,
820 .get_temp = thermal_get_temp,
821 .get_mode = thermal_get_mode,
822 .set_mode = thermal_set_mode,
823 .get_trip_type = thermal_get_trip_type,
824 .get_trip_temp = thermal_get_trip_temp,
825 .get_crit_temp = thermal_get_crit_temp,
826 .notify = thermal_notify,
829 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
836 if (tz->trips.critical.flags.valid)
839 if (tz->trips.hot.flags.valid)
842 if (tz->trips.passive.flags.valid)
845 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
846 tz->trips.active[i].flags.valid; i++, trips++);
848 if (tz->trips.passive.flags.valid)
850 thermal_zone_device_register("acpitz", trips, tz,
851 &acpi_thermal_zone_ops,
852 tz->trips.passive.tc1,
853 tz->trips.passive.tc2,
854 tz->trips.passive.tsp*100,
855 tz->polling_frequency*100);
858 thermal_zone_device_register("acpitz", trips, tz,
859 &acpi_thermal_zone_ops,
861 tz->polling_frequency*100);
862 if (IS_ERR(tz->thermal_zone))
865 result = sysfs_create_link(&tz->device->dev.kobj,
866 &tz->thermal_zone->device.kobj, "thermal_zone");
870 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
871 &tz->device->dev.kobj, "device");
875 status = acpi_attach_data(tz->device->handle,
876 acpi_bus_private_data_handler,
878 if (ACPI_FAILURE(status)) {
879 printk(KERN_ERR PREFIX
880 "Error attaching device data\n");
886 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
887 tz->thermal_zone->id);
891 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
893 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
894 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
895 thermal_zone_device_unregister(tz->thermal_zone);
896 tz->thermal_zone = NULL;
897 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
901 /* --------------------------------------------------------------------------
903 -------------------------------------------------------------------------- */
905 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
907 struct acpi_thermal *tz = acpi_driver_data(device);
914 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
915 acpi_thermal_check(tz);
917 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
918 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
919 acpi_thermal_check(tz);
920 acpi_bus_generate_proc_event(device, event, 0);
921 acpi_bus_generate_netlink_event(device->pnp.device_class,
922 dev_name(&device->dev), event, 0);
924 case ACPI_THERMAL_NOTIFY_DEVICES:
925 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
926 acpi_thermal_check(tz);
927 acpi_bus_generate_proc_event(device, event, 0);
928 acpi_bus_generate_netlink_event(device->pnp.device_class,
929 dev_name(&device->dev), event, 0);
932 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
933 "Unsupported event [0x%x]\n", event));
938 static int acpi_thermal_get_info(struct acpi_thermal *tz)
946 /* Get trip points [_CRT, _PSV, etc.] (required) */
947 result = acpi_thermal_get_trip_points(tz);
951 /* Get temperature [_TMP] (required) */
952 result = acpi_thermal_get_temperature(tz);
956 /* Set the cooling mode [_SCP] to active cooling (default) */
957 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
959 tz->flags.cooling_mode = 1;
961 /* Get default polling frequency [_TZP] (optional) */
963 tz->polling_frequency = tzp;
965 acpi_thermal_get_polling_frequency(tz);
971 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
972 * handles temperature values with a single decimal place. As a consequence,
973 * some implementations use an offset of 273.1 and others use an offset of
974 * 273.2. Try to find out which one is being used, to present the most
975 * accurate and visually appealing number.
977 * The heuristic below should work for all ACPI thermal zones which have a
978 * critical trip point with a value being a multiple of 0.5 degree Celsius.
980 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
982 if (tz->trips.critical.flags.valid &&
983 (tz->trips.critical.temperature % 5) == 1)
984 tz->kelvin_offset = 2731;
986 tz->kelvin_offset = 2732;
989 static int acpi_thermal_add(struct acpi_device *device)
992 struct acpi_thermal *tz = NULL;
998 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1002 tz->device = device;
1003 strcpy(tz->name, device->pnp.bus_id);
1004 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1005 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1006 device->driver_data = tz;
1007 mutex_init(&tz->lock);
1010 result = acpi_thermal_get_info(tz);
1014 acpi_thermal_guess_offset(tz);
1016 result = acpi_thermal_register_thermal_zone(tz);
1020 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1021 acpi_device_name(device), acpi_device_bid(device),
1022 KELVIN_TO_CELSIUS(tz->temperature));
1031 static int acpi_thermal_remove(struct acpi_device *device, int type)
1033 struct acpi_thermal *tz = NULL;
1035 if (!device || !acpi_driver_data(device))
1038 tz = acpi_driver_data(device);
1040 acpi_thermal_unregister_thermal_zone(tz);
1041 mutex_destroy(&tz->lock);
1046 static int acpi_thermal_resume(struct device *dev)
1048 struct acpi_thermal *tz;
1049 int i, j, power_state, result;
1054 tz = acpi_driver_data(to_acpi_device(dev));
1058 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1059 if (!(&tz->trips.active[i]))
1061 if (!tz->trips.active[i].flags.valid)
1063 tz->trips.active[i].flags.enabled = 1;
1064 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1065 result = acpi_bus_update_power(
1066 tz->trips.active[i].devices.handles[j],
1068 if (result || (power_state != ACPI_STATE_D0)) {
1069 tz->trips.active[i].flags.enabled = 0;
1073 tz->state.active |= tz->trips.active[i].flags.enabled;
1076 acpi_thermal_check(tz);
1081 static int thermal_act(const struct dmi_system_id *d) {
1084 printk(KERN_NOTICE "ACPI: %s detected: "
1085 "disabling all active thermal trip points\n", d->ident);
1090 static int thermal_nocrt(const struct dmi_system_id *d) {
1092 printk(KERN_NOTICE "ACPI: %s detected: "
1093 "disabling all critical thermal trip point actions.\n", d->ident);
1097 static int thermal_tzp(const struct dmi_system_id *d) {
1100 printk(KERN_NOTICE "ACPI: %s detected: "
1101 "enabling thermal zone polling\n", d->ident);
1102 tzp = 300; /* 300 dS = 30 Seconds */
1106 static int thermal_psv(const struct dmi_system_id *d) {
1109 printk(KERN_NOTICE "ACPI: %s detected: "
1110 "disabling all passive thermal trip points\n", d->ident);
1116 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1118 * Award BIOS on this AOpen makes thermal control almost worthless.
1119 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1122 .callback = thermal_act,
1123 .ident = "AOpen i915GMm-HFS",
1125 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1126 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1130 .callback = thermal_psv,
1131 .ident = "AOpen i915GMm-HFS",
1133 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1134 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1138 .callback = thermal_tzp,
1139 .ident = "AOpen i915GMm-HFS",
1141 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1142 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1146 .callback = thermal_nocrt,
1147 .ident = "Gigabyte GA-7ZX",
1149 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1150 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1156 static int __init acpi_thermal_init(void)
1160 dmi_check_system(thermal_dmi_table);
1163 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1167 result = acpi_bus_register_driver(&acpi_thermal_driver);
1174 static void __exit acpi_thermal_exit(void)
1177 acpi_bus_unregister_driver(&acpi_thermal_driver);
1182 module_init(acpi_thermal_init);
1183 module_exit(acpi_thermal_exit);