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);
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 #ifdef CONFIG_PM_SLEEP
110 static int acpi_thermal_resume(struct device *dev);
112 static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, NULL, acpi_thermal_resume);
114 static struct acpi_driver acpi_thermal_driver = {
116 .class = ACPI_THERMAL_CLASS,
117 .ids = thermal_device_ids,
119 .add = acpi_thermal_add,
120 .remove = acpi_thermal_remove,
121 .notify = acpi_thermal_notify,
123 .drv.pm = &acpi_thermal_pm,
126 struct acpi_thermal_state {
135 struct acpi_thermal_state_flags {
141 struct acpi_thermal_critical {
142 struct acpi_thermal_state_flags flags;
143 unsigned long temperature;
146 struct acpi_thermal_hot {
147 struct acpi_thermal_state_flags flags;
148 unsigned long temperature;
151 struct acpi_thermal_passive {
152 struct acpi_thermal_state_flags flags;
153 unsigned long temperature;
157 struct acpi_handle_list devices;
160 struct acpi_thermal_active {
161 struct acpi_thermal_state_flags flags;
162 unsigned long temperature;
163 struct acpi_handle_list devices;
166 struct acpi_thermal_trips {
167 struct acpi_thermal_critical critical;
168 struct acpi_thermal_hot hot;
169 struct acpi_thermal_passive passive;
170 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
173 struct acpi_thermal_flags {
174 u8 cooling_mode:1; /* _SCP */
175 u8 devices:1; /* _TZD */
179 struct acpi_thermal {
180 struct acpi_device * device;
182 unsigned long temperature;
183 unsigned long last_temperature;
184 unsigned long polling_frequency;
186 struct acpi_thermal_flags flags;
187 struct acpi_thermal_state state;
188 struct acpi_thermal_trips trips;
189 struct acpi_handle_list devices;
190 struct thermal_zone_device *thermal_zone;
196 /* --------------------------------------------------------------------------
197 Thermal Zone Management
198 -------------------------------------------------------------------------- */
200 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
202 acpi_status status = AE_OK;
203 unsigned long long tmp;
208 tz->last_temperature = tz->temperature;
210 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
211 if (ACPI_FAILURE(status))
214 tz->temperature = tmp;
215 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
221 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
223 acpi_status status = AE_OK;
224 unsigned long long tmp;
229 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
230 if (ACPI_FAILURE(status))
233 tz->polling_frequency = tmp;
234 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
235 tz->polling_frequency));
240 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
245 if (!acpi_has_method(tz->device->handle, "_SCP")) {
246 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
248 } else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
256 #define ACPI_TRIPS_CRITICAL 0x01
257 #define ACPI_TRIPS_HOT 0x02
258 #define ACPI_TRIPS_PASSIVE 0x04
259 #define ACPI_TRIPS_ACTIVE 0x08
260 #define ACPI_TRIPS_DEVICES 0x10
262 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
263 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
265 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
266 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
270 * This exception is thrown out in two cases:
271 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
272 * when re-evaluating the AML code.
273 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
274 * We need to re-bind the cooling devices of a thermal zone when this occurs.
276 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
278 if (flags != ACPI_TRIPS_INIT) \
279 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
280 "ACPI thermal trip point %s changed\n" \
281 "Please send acpidump to linux-acpi@vger.kernel.org", str)); \
284 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
286 acpi_status status = AE_OK;
287 unsigned long long tmp;
288 struct acpi_handle_list devices;
292 /* Critical Shutdown */
293 if (flag & ACPI_TRIPS_CRITICAL) {
294 status = acpi_evaluate_integer(tz->device->handle,
296 tz->trips.critical.temperature = tmp;
298 * Treat freezing temperatures as invalid as well; some
299 * BIOSes return really low values and cause reboots at startup.
300 * Below zero (Celsius) values clearly aren't right for sure..
301 * ... so lets discard those as invalid.
303 if (ACPI_FAILURE(status)) {
304 tz->trips.critical.flags.valid = 0;
305 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
306 "No critical threshold\n"));
307 } else if (tmp <= 2732) {
308 printk(KERN_WARNING FW_BUG "Invalid critical threshold "
310 tz->trips.critical.flags.valid = 0;
312 tz->trips.critical.flags.valid = 1;
313 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
314 "Found critical threshold [%lu]\n",
315 tz->trips.critical.temperature));
317 if (tz->trips.critical.flags.valid == 1) {
319 tz->trips.critical.flags.valid = 0;
320 } else if (crt > 0) {
321 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
323 * Allow override critical threshold
325 if (crt_k > tz->trips.critical.temperature)
326 printk(KERN_WARNING PREFIX
327 "Critical threshold %d C\n", crt);
328 tz->trips.critical.temperature = crt_k;
333 /* Critical Sleep (optional) */
334 if (flag & ACPI_TRIPS_HOT) {
335 status = acpi_evaluate_integer(tz->device->handle,
337 if (ACPI_FAILURE(status)) {
338 tz->trips.hot.flags.valid = 0;
339 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
340 "No hot threshold\n"));
342 tz->trips.hot.temperature = tmp;
343 tz->trips.hot.flags.valid = 1;
344 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
345 "Found hot threshold [%lu]\n",
346 tz->trips.critical.temperature));
350 /* Passive (optional) */
351 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
352 (flag == ACPI_TRIPS_INIT)) {
353 valid = tz->trips.passive.flags.valid;
356 } else if (psv > 0) {
357 tmp = CELSIUS_TO_KELVIN(psv);
360 status = acpi_evaluate_integer(tz->device->handle,
364 if (ACPI_FAILURE(status))
365 tz->trips.passive.flags.valid = 0;
367 tz->trips.passive.temperature = tmp;
368 tz->trips.passive.flags.valid = 1;
369 if (flag == ACPI_TRIPS_INIT) {
370 status = acpi_evaluate_integer(
371 tz->device->handle, "_TC1",
373 if (ACPI_FAILURE(status))
374 tz->trips.passive.flags.valid = 0;
376 tz->trips.passive.tc1 = tmp;
377 status = acpi_evaluate_integer(
378 tz->device->handle, "_TC2",
380 if (ACPI_FAILURE(status))
381 tz->trips.passive.flags.valid = 0;
383 tz->trips.passive.tc2 = tmp;
384 status = acpi_evaluate_integer(
385 tz->device->handle, "_TSP",
387 if (ACPI_FAILURE(status))
388 tz->trips.passive.flags.valid = 0;
390 tz->trips.passive.tsp = tmp;
394 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
395 memset(&devices, 0, sizeof(struct acpi_handle_list));
396 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
398 if (ACPI_FAILURE(status)) {
399 printk(KERN_WARNING PREFIX
400 "Invalid passive threshold\n");
401 tz->trips.passive.flags.valid = 0;
404 tz->trips.passive.flags.valid = 1;
406 if (memcmp(&tz->trips.passive.devices, &devices,
407 sizeof(struct acpi_handle_list))) {
408 memcpy(&tz->trips.passive.devices, &devices,
409 sizeof(struct acpi_handle_list));
410 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
413 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
414 if (valid != tz->trips.passive.flags.valid)
415 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
418 /* Active (optional) */
419 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
420 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
421 valid = tz->trips.active[i].flags.valid;
424 break; /* disable all active trip points */
426 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
427 tz->trips.active[i].flags.valid)) {
428 status = acpi_evaluate_integer(tz->device->handle,
430 if (ACPI_FAILURE(status)) {
431 tz->trips.active[i].flags.valid = 0;
437 tz->trips.active[0].temperature =
438 CELSIUS_TO_KELVIN(act);
441 * Don't allow override higher than
442 * the next higher trip point
444 tz->trips.active[i - 1].temperature =
445 (tz->trips.active[i - 2].temperature <
446 CELSIUS_TO_KELVIN(act) ?
447 tz->trips.active[i - 2].temperature :
448 CELSIUS_TO_KELVIN(act));
451 tz->trips.active[i].temperature = tmp;
452 tz->trips.active[i].flags.valid = 1;
457 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
458 memset(&devices, 0, sizeof(struct acpi_handle_list));
459 status = acpi_evaluate_reference(tz->device->handle,
460 name, NULL, &devices);
461 if (ACPI_FAILURE(status)) {
462 printk(KERN_WARNING PREFIX
463 "Invalid active%d threshold\n", i);
464 tz->trips.active[i].flags.valid = 0;
467 tz->trips.active[i].flags.valid = 1;
469 if (memcmp(&tz->trips.active[i].devices, &devices,
470 sizeof(struct acpi_handle_list))) {
471 memcpy(&tz->trips.active[i].devices, &devices,
472 sizeof(struct acpi_handle_list));
473 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
476 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
477 if (valid != tz->trips.active[i].flags.valid)
478 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
480 if (!tz->trips.active[i].flags.valid)
484 if (flag & ACPI_TRIPS_DEVICES) {
485 memset(&devices, 0, sizeof(struct acpi_handle_list));
486 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
488 if (memcmp(&tz->devices, &devices,
489 sizeof(struct acpi_handle_list))) {
490 memcpy(&tz->devices, &devices,
491 sizeof(struct acpi_handle_list));
492 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
499 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
501 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
506 valid = tz->trips.critical.flags.valid |
507 tz->trips.hot.flags.valid |
508 tz->trips.passive.flags.valid;
510 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
511 valid |= tz->trips.active[i].flags.valid;
514 printk(KERN_WARNING FW_BUG "No valid trip found\n");
520 static void acpi_thermal_check(void *data)
522 struct acpi_thermal *tz = data;
524 if (!tz->tz_enabled) {
525 pr_warn("thermal zone is disabled \n");
528 thermal_zone_device_update(tz->thermal_zone);
531 /* sys I/F for generic thermal sysfs support */
532 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
534 static int thermal_get_temp(struct thermal_zone_device *thermal,
537 struct acpi_thermal *tz = thermal->devdata;
543 result = acpi_thermal_get_temperature(tz);
547 *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
551 static int thermal_get_mode(struct thermal_zone_device *thermal,
552 enum thermal_device_mode *mode)
554 struct acpi_thermal *tz = thermal->devdata;
559 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
560 THERMAL_DEVICE_DISABLED;
565 static int thermal_set_mode(struct thermal_zone_device *thermal,
566 enum thermal_device_mode mode)
568 struct acpi_thermal *tz = thermal->devdata;
575 * enable/disable thermal management from ACPI thermal driver
577 if (mode == THERMAL_DEVICE_ENABLED)
579 else if (mode == THERMAL_DEVICE_DISABLED)
584 if (enable != tz->tz_enabled) {
585 tz->tz_enabled = enable;
586 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
587 "%s kernel ACPI thermal control\n",
588 tz->tz_enabled ? "Enable" : "Disable"));
589 acpi_thermal_check(tz);
594 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
595 int trip, enum thermal_trip_type *type)
597 struct acpi_thermal *tz = thermal->devdata;
603 if (tz->trips.critical.flags.valid) {
605 *type = THERMAL_TRIP_CRITICAL;
611 if (tz->trips.hot.flags.valid) {
613 *type = THERMAL_TRIP_HOT;
619 if (tz->trips.passive.flags.valid) {
621 *type = THERMAL_TRIP_PASSIVE;
627 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
628 tz->trips.active[i].flags.valid; i++) {
630 *type = THERMAL_TRIP_ACTIVE;
639 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
640 int trip, unsigned long *temp)
642 struct acpi_thermal *tz = thermal->devdata;
648 if (tz->trips.critical.flags.valid) {
650 *temp = KELVIN_TO_MILLICELSIUS(
651 tz->trips.critical.temperature,
658 if (tz->trips.hot.flags.valid) {
660 *temp = KELVIN_TO_MILLICELSIUS(
661 tz->trips.hot.temperature,
668 if (tz->trips.passive.flags.valid) {
670 *temp = KELVIN_TO_MILLICELSIUS(
671 tz->trips.passive.temperature,
678 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
679 tz->trips.active[i].flags.valid; i++) {
681 *temp = KELVIN_TO_MILLICELSIUS(
682 tz->trips.active[i].temperature,
692 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
693 unsigned long *temperature) {
694 struct acpi_thermal *tz = thermal->devdata;
696 if (tz->trips.critical.flags.valid) {
697 *temperature = KELVIN_TO_MILLICELSIUS(
698 tz->trips.critical.temperature,
705 static int thermal_get_trend(struct thermal_zone_device *thermal,
706 int trip, enum thermal_trend *trend)
708 struct acpi_thermal *tz = thermal->devdata;
709 enum thermal_trip_type type;
712 if (thermal_get_trip_type(thermal, trip, &type))
715 if (type == THERMAL_TRIP_ACTIVE) {
716 unsigned long trip_temp;
717 unsigned long temp = KELVIN_TO_MILLICELSIUS(tz->temperature,
719 if (thermal_get_trip_temp(thermal, trip, &trip_temp))
722 if (temp > trip_temp) {
723 *trend = THERMAL_TREND_RAISING;
726 /* Fall back on default trend */
732 * tz->temperature has already been updated by generic thermal layer,
733 * before this callback being invoked
735 i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
736 + (tz->trips.passive.tc2
737 * (tz->temperature - tz->trips.passive.temperature));
740 *trend = THERMAL_TREND_RAISING;
742 *trend = THERMAL_TREND_DROPPING;
744 *trend = THERMAL_TREND_STABLE;
749 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
750 enum thermal_trip_type trip_type)
753 struct acpi_thermal *tz = thermal->devdata;
755 if (trip_type == THERMAL_TRIP_CRITICAL)
756 type = ACPI_THERMAL_NOTIFY_CRITICAL;
757 else if (trip_type == THERMAL_TRIP_HOT)
758 type = ACPI_THERMAL_NOTIFY_HOT;
762 acpi_bus_generate_proc_event(tz->device, type, 1);
763 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
764 dev_name(&tz->device->dev), type, 1);
766 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
772 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
773 struct thermal_cooling_device *cdev,
776 struct acpi_device *device = cdev->devdata;
777 struct acpi_thermal *tz = thermal->devdata;
778 struct acpi_device *dev;
786 if (tz->trips.critical.flags.valid)
789 if (tz->trips.hot.flags.valid)
792 if (tz->trips.passive.flags.valid) {
794 for (i = 0; i < tz->trips.passive.devices.count;
796 handle = tz->trips.passive.devices.handles[i];
797 status = acpi_bus_get_device(handle, &dev);
798 if (ACPI_FAILURE(status) || dev != device)
802 thermal_zone_bind_cooling_device
803 (thermal, trip, cdev,
804 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
807 thermal_zone_unbind_cooling_device
808 (thermal, trip, cdev);
814 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
815 if (!tz->trips.active[i].flags.valid)
819 j < tz->trips.active[i].devices.count;
821 handle = tz->trips.active[i].devices.handles[j];
822 status = acpi_bus_get_device(handle, &dev);
823 if (ACPI_FAILURE(status) || dev != device)
826 result = thermal_zone_bind_cooling_device
827 (thermal, trip, cdev,
828 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
830 result = thermal_zone_unbind_cooling_device
831 (thermal, trip, cdev);
837 for (i = 0; i < tz->devices.count; i++) {
838 handle = tz->devices.handles[i];
839 status = acpi_bus_get_device(handle, &dev);
840 if (ACPI_SUCCESS(status) && (dev == device)) {
842 result = thermal_zone_bind_cooling_device
847 result = thermal_zone_unbind_cooling_device
859 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
860 struct thermal_cooling_device *cdev)
862 return acpi_thermal_cooling_device_cb(thermal, cdev, true);
866 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
867 struct thermal_cooling_device *cdev)
869 return acpi_thermal_cooling_device_cb(thermal, cdev, false);
872 static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
873 .bind = acpi_thermal_bind_cooling_device,
874 .unbind = acpi_thermal_unbind_cooling_device,
875 .get_temp = thermal_get_temp,
876 .get_mode = thermal_get_mode,
877 .set_mode = thermal_set_mode,
878 .get_trip_type = thermal_get_trip_type,
879 .get_trip_temp = thermal_get_trip_temp,
880 .get_crit_temp = thermal_get_crit_temp,
881 .get_trend = thermal_get_trend,
882 .notify = thermal_notify,
885 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
892 if (tz->trips.critical.flags.valid)
895 if (tz->trips.hot.flags.valid)
898 if (tz->trips.passive.flags.valid)
901 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
902 tz->trips.active[i].flags.valid; i++, trips++);
904 if (tz->trips.passive.flags.valid)
906 thermal_zone_device_register("acpitz", trips, 0, tz,
907 &acpi_thermal_zone_ops, NULL,
908 tz->trips.passive.tsp*100,
909 tz->polling_frequency*100);
912 thermal_zone_device_register("acpitz", trips, 0, tz,
913 &acpi_thermal_zone_ops, NULL,
914 0, tz->polling_frequency*100);
915 if (IS_ERR(tz->thermal_zone))
918 result = sysfs_create_link(&tz->device->dev.kobj,
919 &tz->thermal_zone->device.kobj, "thermal_zone");
923 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
924 &tz->device->dev.kobj, "device");
928 status = acpi_attach_data(tz->device->handle,
929 acpi_bus_private_data_handler,
931 if (ACPI_FAILURE(status)) {
932 printk(KERN_ERR PREFIX
933 "Error attaching device data\n");
939 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
940 tz->thermal_zone->id);
944 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
946 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
947 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
948 thermal_zone_device_unregister(tz->thermal_zone);
949 tz->thermal_zone = NULL;
950 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
954 /* --------------------------------------------------------------------------
956 -------------------------------------------------------------------------- */
958 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
960 struct acpi_thermal *tz = acpi_driver_data(device);
967 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
968 acpi_thermal_check(tz);
970 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
971 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
972 acpi_thermal_check(tz);
973 acpi_bus_generate_proc_event(device, event, 0);
974 acpi_bus_generate_netlink_event(device->pnp.device_class,
975 dev_name(&device->dev), event, 0);
977 case ACPI_THERMAL_NOTIFY_DEVICES:
978 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
979 acpi_thermal_check(tz);
980 acpi_bus_generate_proc_event(device, event, 0);
981 acpi_bus_generate_netlink_event(device->pnp.device_class,
982 dev_name(&device->dev), event, 0);
985 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
986 "Unsupported event [0x%x]\n", event));
992 * On some platforms, the AML code has dependency about
993 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
994 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
995 * /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
996 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
997 * if _TMP has never been evaluated.
999 * As this dependency is totally transparent to OS, evaluate
1000 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
1001 * _TMP, before they are actually used.
1003 static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
1005 acpi_handle handle = tz->device->handle;
1006 unsigned long long value;
1009 acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1010 acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1011 acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1012 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1013 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1016 status = acpi_evaluate_integer(handle, name, NULL, &value);
1017 if (status == AE_NOT_FOUND)
1020 acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1023 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1031 acpi_thermal_aml_dependency_fix(tz);
1033 /* Get trip points [_CRT, _PSV, etc.] (required) */
1034 result = acpi_thermal_get_trip_points(tz);
1038 /* Get temperature [_TMP] (required) */
1039 result = acpi_thermal_get_temperature(tz);
1043 /* Set the cooling mode [_SCP] to active cooling (default) */
1044 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1046 tz->flags.cooling_mode = 1;
1048 /* Get default polling frequency [_TZP] (optional) */
1050 tz->polling_frequency = tzp;
1052 acpi_thermal_get_polling_frequency(tz);
1058 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1059 * handles temperature values with a single decimal place. As a consequence,
1060 * some implementations use an offset of 273.1 and others use an offset of
1061 * 273.2. Try to find out which one is being used, to present the most
1062 * accurate and visually appealing number.
1064 * The heuristic below should work for all ACPI thermal zones which have a
1065 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1067 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1069 if (tz->trips.critical.flags.valid &&
1070 (tz->trips.critical.temperature % 5) == 1)
1071 tz->kelvin_offset = 2731;
1073 tz->kelvin_offset = 2732;
1076 static int acpi_thermal_add(struct acpi_device *device)
1079 struct acpi_thermal *tz = NULL;
1085 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1089 tz->device = device;
1090 strcpy(tz->name, device->pnp.bus_id);
1091 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1092 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1093 device->driver_data = tz;
1094 mutex_init(&tz->lock);
1097 result = acpi_thermal_get_info(tz);
1101 acpi_thermal_guess_offset(tz);
1103 result = acpi_thermal_register_thermal_zone(tz);
1107 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1108 acpi_device_name(device), acpi_device_bid(device),
1109 KELVIN_TO_CELSIUS(tz->temperature));
1118 static int acpi_thermal_remove(struct acpi_device *device)
1120 struct acpi_thermal *tz = NULL;
1122 if (!device || !acpi_driver_data(device))
1125 tz = acpi_driver_data(device);
1127 acpi_thermal_unregister_thermal_zone(tz);
1128 mutex_destroy(&tz->lock);
1133 #ifdef CONFIG_PM_SLEEP
1134 static int acpi_thermal_resume(struct device *dev)
1136 struct acpi_thermal *tz;
1137 int i, j, power_state, result;
1142 tz = acpi_driver_data(to_acpi_device(dev));
1146 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1147 if (!(&tz->trips.active[i]))
1149 if (!tz->trips.active[i].flags.valid)
1151 tz->trips.active[i].flags.enabled = 1;
1152 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1153 result = acpi_bus_update_power(
1154 tz->trips.active[i].devices.handles[j],
1156 if (result || (power_state != ACPI_STATE_D0)) {
1157 tz->trips.active[i].flags.enabled = 0;
1161 tz->state.active |= tz->trips.active[i].flags.enabled;
1164 acpi_thermal_check(tz);
1170 static int thermal_act(const struct dmi_system_id *d) {
1173 printk(KERN_NOTICE "ACPI: %s detected: "
1174 "disabling all active thermal trip points\n", d->ident);
1179 static int thermal_nocrt(const struct dmi_system_id *d) {
1181 printk(KERN_NOTICE "ACPI: %s detected: "
1182 "disabling all critical thermal trip point actions.\n", d->ident);
1186 static int thermal_tzp(const struct dmi_system_id *d) {
1189 printk(KERN_NOTICE "ACPI: %s detected: "
1190 "enabling thermal zone polling\n", d->ident);
1191 tzp = 300; /* 300 dS = 30 Seconds */
1195 static int thermal_psv(const struct dmi_system_id *d) {
1198 printk(KERN_NOTICE "ACPI: %s detected: "
1199 "disabling all passive thermal trip points\n", d->ident);
1205 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1207 * Award BIOS on this AOpen makes thermal control almost worthless.
1208 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1211 .callback = thermal_act,
1212 .ident = "AOpen i915GMm-HFS",
1214 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1215 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1219 .callback = thermal_psv,
1220 .ident = "AOpen i915GMm-HFS",
1222 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1223 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1227 .callback = thermal_tzp,
1228 .ident = "AOpen i915GMm-HFS",
1230 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1231 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1235 .callback = thermal_nocrt,
1236 .ident = "Gigabyte GA-7ZX",
1238 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1239 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1245 static int __init acpi_thermal_init(void)
1249 dmi_check_system(thermal_dmi_table);
1252 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1256 result = acpi_bus_register_driver(&acpi_thermal_driver);
1263 static void __exit acpi_thermal_exit(void)
1266 acpi_bus_unregister_driver(&acpi_thermal_driver);
1271 module_init(acpi_thermal_init);
1272 module_exit(acpi_thermal_exit);