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
);