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 int thermal_get_mode(struct thermal_zone_device
*thermal
,
556 enum thermal_device_mode
*mode
)
558 struct acpi_thermal
*tz
= thermal
->devdata
;
563 *mode
= tz
->tz_enabled
? THERMAL_DEVICE_ENABLED
:
564 THERMAL_DEVICE_DISABLED
;
569 static int thermal_set_mode(struct thermal_zone_device
*thermal
,
570 enum thermal_device_mode mode
)
572 struct acpi_thermal
*tz
= thermal
->devdata
;
579 * enable/disable thermal management from ACPI thermal driver
581 if (mode
== THERMAL_DEVICE_ENABLED
)
583 else if (mode
== THERMAL_DEVICE_DISABLED
)
588 if (enable
!= tz
->tz_enabled
) {
589 tz
->tz_enabled
= enable
;
590 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
591 "%s kernel ACPI thermal control\n",
592 tz
->tz_enabled
? "Enable" : "Disable"));
593 acpi_thermal_check(tz
);
598 static int thermal_get_trip_type(struct thermal_zone_device
*thermal
,
599 int trip
, enum thermal_trip_type
*type
)
601 struct acpi_thermal
*tz
= thermal
->devdata
;
607 if (tz
->trips
.critical
.flags
.valid
) {
609 *type
= THERMAL_TRIP_CRITICAL
;
615 if (tz
->trips
.hot
.flags
.valid
) {
617 *type
= THERMAL_TRIP_HOT
;
623 if (tz
->trips
.passive
.flags
.valid
) {
625 *type
= THERMAL_TRIP_PASSIVE
;
631 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
&&
632 tz
->trips
.active
[i
].flags
.valid
; i
++) {
634 *type
= THERMAL_TRIP_ACTIVE
;
643 static int thermal_get_trip_temp(struct thermal_zone_device
*thermal
,
644 int trip
, unsigned long *temp
)
646 struct acpi_thermal
*tz
= thermal
->devdata
;
652 if (tz
->trips
.critical
.flags
.valid
) {
654 *temp
= KELVIN_TO_MILLICELSIUS(
655 tz
->trips
.critical
.temperature
,
662 if (tz
->trips
.hot
.flags
.valid
) {
664 *temp
= KELVIN_TO_MILLICELSIUS(
665 tz
->trips
.hot
.temperature
,
672 if (tz
->trips
.passive
.flags
.valid
) {
674 *temp
= KELVIN_TO_MILLICELSIUS(
675 tz
->trips
.passive
.temperature
,
682 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
&&
683 tz
->trips
.active
[i
].flags
.valid
; i
++) {
685 *temp
= KELVIN_TO_MILLICELSIUS(
686 tz
->trips
.active
[i
].temperature
,
696 static int thermal_get_crit_temp(struct thermal_zone_device
*thermal
,
697 unsigned long *temperature
) {
698 struct acpi_thermal
*tz
= thermal
->devdata
;
700 if (tz
->trips
.critical
.flags
.valid
) {
701 *temperature
= KELVIN_TO_MILLICELSIUS(
702 tz
->trips
.critical
.temperature
,
709 static int thermal_notify(struct thermal_zone_device
*thermal
, int trip
,
710 enum thermal_trip_type trip_type
)
713 struct acpi_thermal
*tz
= thermal
->devdata
;
715 if (trip_type
== THERMAL_TRIP_CRITICAL
)
716 type
= ACPI_THERMAL_NOTIFY_CRITICAL
;
717 else if (trip_type
== THERMAL_TRIP_HOT
)
718 type
= ACPI_THERMAL_NOTIFY_HOT
;
722 acpi_bus_generate_proc_event(tz
->device
, type
, 1);
723 acpi_bus_generate_netlink_event(tz
->device
->pnp
.device_class
,
724 dev_name(&tz
->device
->dev
), type
, 1);
726 if (trip_type
== THERMAL_TRIP_CRITICAL
&& nocrt
)
732 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device
*thermal
,
733 struct thermal_cooling_device
*cdev
,
736 struct acpi_device
*device
= cdev
->devdata
;
737 struct acpi_thermal
*tz
= thermal
->devdata
;
738 struct acpi_device
*dev
;
746 if (tz
->trips
.critical
.flags
.valid
)
749 if (tz
->trips
.hot
.flags
.valid
)
752 if (tz
->trips
.passive
.flags
.valid
) {
754 for (i
= 0; i
< tz
->trips
.passive
.devices
.count
;
756 handle
= tz
->trips
.passive
.devices
.handles
[i
];
757 status
= acpi_bus_get_device(handle
, &dev
);
758 if (ACPI_FAILURE(status
) || dev
!= device
)
762 thermal_zone_bind_cooling_device
763 (thermal
, trip
, cdev
,
764 THERMAL_NO_LIMIT
, THERMAL_NO_LIMIT
);
767 thermal_zone_unbind_cooling_device
768 (thermal
, trip
, cdev
);
774 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
775 if (!tz
->trips
.active
[i
].flags
.valid
)
779 j
< tz
->trips
.active
[i
].devices
.count
;
781 handle
= tz
->trips
.active
[i
].devices
.handles
[j
];
782 status
= acpi_bus_get_device(handle
, &dev
);
783 if (ACPI_FAILURE(status
) || dev
!= device
)
786 result
= thermal_zone_bind_cooling_device
787 (thermal
, trip
, cdev
,
788 THERMAL_NO_LIMIT
, THERMAL_NO_LIMIT
);
790 result
= thermal_zone_unbind_cooling_device
791 (thermal
, trip
, cdev
);
797 for (i
= 0; i
< tz
->devices
.count
; i
++) {
798 handle
= tz
->devices
.handles
[i
];
799 status
= acpi_bus_get_device(handle
, &dev
);
800 if (ACPI_SUCCESS(status
) && (dev
== device
)) {
802 result
= thermal_zone_bind_cooling_device
807 result
= thermal_zone_unbind_cooling_device
819 acpi_thermal_bind_cooling_device(struct thermal_zone_device
*thermal
,
820 struct thermal_cooling_device
*cdev
)
822 return acpi_thermal_cooling_device_cb(thermal
, cdev
, true);
826 acpi_thermal_unbind_cooling_device(struct thermal_zone_device
*thermal
,
827 struct thermal_cooling_device
*cdev
)
829 return acpi_thermal_cooling_device_cb(thermal
, cdev
, false);
832 static const struct thermal_zone_device_ops acpi_thermal_zone_ops
= {
833 .bind
= acpi_thermal_bind_cooling_device
,
834 .unbind
= acpi_thermal_unbind_cooling_device
,
835 .get_temp
= thermal_get_temp
,
836 .get_mode
= thermal_get_mode
,
837 .set_mode
= thermal_set_mode
,
838 .get_trip_type
= thermal_get_trip_type
,
839 .get_trip_temp
= thermal_get_trip_temp
,
840 .get_crit_temp
= thermal_get_crit_temp
,
841 .notify
= thermal_notify
,
844 static int acpi_thermal_register_thermal_zone(struct acpi_thermal
*tz
)
851 if (tz
->trips
.critical
.flags
.valid
)
854 if (tz
->trips
.hot
.flags
.valid
)
857 if (tz
->trips
.passive
.flags
.valid
)
860 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
&&
861 tz
->trips
.active
[i
].flags
.valid
; i
++, trips
++);
863 if (tz
->trips
.passive
.flags
.valid
)
865 thermal_zone_device_register("acpitz", trips
, 0, tz
,
866 &acpi_thermal_zone_ops
,
867 tz
->trips
.passive
.tc1
,
868 tz
->trips
.passive
.tc2
,
869 tz
->trips
.passive
.tsp
*100,
870 tz
->polling_frequency
*100);
873 thermal_zone_device_register("acpitz", trips
, 0, tz
,
874 &acpi_thermal_zone_ops
,
876 tz
->polling_frequency
*100);
877 if (IS_ERR(tz
->thermal_zone
))
880 result
= sysfs_create_link(&tz
->device
->dev
.kobj
,
881 &tz
->thermal_zone
->device
.kobj
, "thermal_zone");
885 result
= sysfs_create_link(&tz
->thermal_zone
->device
.kobj
,
886 &tz
->device
->dev
.kobj
, "device");
890 status
= acpi_attach_data(tz
->device
->handle
,
891 acpi_bus_private_data_handler
,
893 if (ACPI_FAILURE(status
)) {
894 printk(KERN_ERR PREFIX
895 "Error attaching device data\n");
901 dev_info(&tz
->device
->dev
, "registered as thermal_zone%d\n",
902 tz
->thermal_zone
->id
);
906 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal
*tz
)
908 sysfs_remove_link(&tz
->device
->dev
.kobj
, "thermal_zone");
909 sysfs_remove_link(&tz
->thermal_zone
->device
.kobj
, "device");
910 thermal_zone_device_unregister(tz
->thermal_zone
);
911 tz
->thermal_zone
= NULL
;
912 acpi_detach_data(tz
->device
->handle
, acpi_bus_private_data_handler
);
916 /* --------------------------------------------------------------------------
918 -------------------------------------------------------------------------- */
920 static void acpi_thermal_notify(struct acpi_device
*device
, u32 event
)
922 struct acpi_thermal
*tz
= acpi_driver_data(device
);
929 case ACPI_THERMAL_NOTIFY_TEMPERATURE
:
930 acpi_thermal_check(tz
);
932 case ACPI_THERMAL_NOTIFY_THRESHOLDS
:
933 acpi_thermal_trips_update(tz
, ACPI_TRIPS_REFRESH_THRESHOLDS
);
934 acpi_thermal_check(tz
);
935 acpi_bus_generate_proc_event(device
, event
, 0);
936 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
937 dev_name(&device
->dev
), event
, 0);
939 case ACPI_THERMAL_NOTIFY_DEVICES
:
940 acpi_thermal_trips_update(tz
, ACPI_TRIPS_REFRESH_DEVICES
);
941 acpi_thermal_check(tz
);
942 acpi_bus_generate_proc_event(device
, event
, 0);
943 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
944 dev_name(&device
->dev
), event
, 0);
947 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
948 "Unsupported event [0x%x]\n", event
));
953 static int acpi_thermal_get_info(struct acpi_thermal
*tz
)
961 /* Get trip points [_CRT, _PSV, etc.] (required) */
962 result
= acpi_thermal_get_trip_points(tz
);
966 /* Get temperature [_TMP] (required) */
967 result
= acpi_thermal_get_temperature(tz
);
971 /* Set the cooling mode [_SCP] to active cooling (default) */
972 result
= acpi_thermal_set_cooling_mode(tz
, ACPI_THERMAL_MODE_ACTIVE
);
974 tz
->flags
.cooling_mode
= 1;
976 /* Get default polling frequency [_TZP] (optional) */
978 tz
->polling_frequency
= tzp
;
980 acpi_thermal_get_polling_frequency(tz
);
986 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
987 * handles temperature values with a single decimal place. As a consequence,
988 * some implementations use an offset of 273.1 and others use an offset of
989 * 273.2. Try to find out which one is being used, to present the most
990 * accurate and visually appealing number.
992 * The heuristic below should work for all ACPI thermal zones which have a
993 * critical trip point with a value being a multiple of 0.5 degree Celsius.
995 static void acpi_thermal_guess_offset(struct acpi_thermal
*tz
)
997 if (tz
->trips
.critical
.flags
.valid
&&
998 (tz
->trips
.critical
.temperature
% 5) == 1)
999 tz
->kelvin_offset
= 2731;
1001 tz
->kelvin_offset
= 2732;
1004 static int acpi_thermal_add(struct acpi_device
*device
)
1007 struct acpi_thermal
*tz
= NULL
;
1013 tz
= kzalloc(sizeof(struct acpi_thermal
), GFP_KERNEL
);
1017 tz
->device
= device
;
1018 strcpy(tz
->name
, device
->pnp
.bus_id
);
1019 strcpy(acpi_device_name(device
), ACPI_THERMAL_DEVICE_NAME
);
1020 strcpy(acpi_device_class(device
), ACPI_THERMAL_CLASS
);
1021 device
->driver_data
= tz
;
1022 mutex_init(&tz
->lock
);
1025 result
= acpi_thermal_get_info(tz
);
1029 acpi_thermal_guess_offset(tz
);
1031 result
= acpi_thermal_register_thermal_zone(tz
);
1035 printk(KERN_INFO PREFIX
"%s [%s] (%ld C)\n",
1036 acpi_device_name(device
), acpi_device_bid(device
),
1037 KELVIN_TO_CELSIUS(tz
->temperature
));
1046 static int acpi_thermal_remove(struct acpi_device
*device
, int type
)
1048 struct acpi_thermal
*tz
= NULL
;
1050 if (!device
|| !acpi_driver_data(device
))
1053 tz
= acpi_driver_data(device
);
1055 acpi_thermal_unregister_thermal_zone(tz
);
1056 mutex_destroy(&tz
->lock
);
1061 static int acpi_thermal_resume(struct device
*dev
)
1063 struct acpi_thermal
*tz
;
1064 int i
, j
, power_state
, result
;
1069 tz
= acpi_driver_data(to_acpi_device(dev
));
1073 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
1074 if (!(&tz
->trips
.active
[i
]))
1076 if (!tz
->trips
.active
[i
].flags
.valid
)
1078 tz
->trips
.active
[i
].flags
.enabled
= 1;
1079 for (j
= 0; j
< tz
->trips
.active
[i
].devices
.count
; j
++) {
1080 result
= acpi_bus_update_power(
1081 tz
->trips
.active
[i
].devices
.handles
[j
],
1083 if (result
|| (power_state
!= ACPI_STATE_D0
)) {
1084 tz
->trips
.active
[i
].flags
.enabled
= 0;
1088 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
1091 acpi_thermal_check(tz
);
1096 static int thermal_act(const struct dmi_system_id
*d
) {
1099 printk(KERN_NOTICE
"ACPI: %s detected: "
1100 "disabling all active thermal trip points\n", d
->ident
);
1105 static int thermal_nocrt(const struct dmi_system_id
*d
) {
1107 printk(KERN_NOTICE
"ACPI: %s detected: "
1108 "disabling all critical thermal trip point actions.\n", d
->ident
);
1112 static int thermal_tzp(const struct dmi_system_id
*d
) {
1115 printk(KERN_NOTICE
"ACPI: %s detected: "
1116 "enabling thermal zone polling\n", d
->ident
);
1117 tzp
= 300; /* 300 dS = 30 Seconds */
1121 static int thermal_psv(const struct dmi_system_id
*d
) {
1124 printk(KERN_NOTICE
"ACPI: %s detected: "
1125 "disabling all passive thermal trip points\n", d
->ident
);
1131 static struct dmi_system_id thermal_dmi_table
[] __initdata
= {
1133 * Award BIOS on this AOpen makes thermal control almost worthless.
1134 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1137 .callback
= thermal_act
,
1138 .ident
= "AOpen i915GMm-HFS",
1140 DMI_MATCH(DMI_BOARD_VENDOR
, "AOpen"),
1141 DMI_MATCH(DMI_BOARD_NAME
, "i915GMm-HFS"),
1145 .callback
= thermal_psv
,
1146 .ident
= "AOpen i915GMm-HFS",
1148 DMI_MATCH(DMI_BOARD_VENDOR
, "AOpen"),
1149 DMI_MATCH(DMI_BOARD_NAME
, "i915GMm-HFS"),
1153 .callback
= thermal_tzp
,
1154 .ident
= "AOpen i915GMm-HFS",
1156 DMI_MATCH(DMI_BOARD_VENDOR
, "AOpen"),
1157 DMI_MATCH(DMI_BOARD_NAME
, "i915GMm-HFS"),
1161 .callback
= thermal_nocrt
,
1162 .ident
= "Gigabyte GA-7ZX",
1164 DMI_MATCH(DMI_BOARD_VENDOR
, "Gigabyte Technology Co., Ltd."),
1165 DMI_MATCH(DMI_BOARD_NAME
, "7ZX"),
1171 static int __init
acpi_thermal_init(void)
1175 dmi_check_system(thermal_dmi_table
);
1178 printk(KERN_NOTICE
"ACPI: thermal control disabled\n");
1182 result
= acpi_bus_register_driver(&acpi_thermal_driver
);
1189 static void __exit
acpi_thermal_exit(void)
1192 acpi_bus_unregister_driver(&acpi_thermal_driver
);
1197 module_init(acpi_thermal_init
);
1198 module_exit(acpi_thermal_exit
);