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 typedef int (*cb
)(struct thermal_zone_device
*, int,
733 struct thermal_cooling_device
*);
734 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device
*thermal
,
735 struct thermal_cooling_device
*cdev
,
738 struct acpi_device
*device
= cdev
->devdata
;
739 struct acpi_thermal
*tz
= thermal
->devdata
;
740 struct acpi_device
*dev
;
748 if (tz
->trips
.critical
.flags
.valid
)
751 if (tz
->trips
.hot
.flags
.valid
)
754 if (tz
->trips
.passive
.flags
.valid
) {
756 for (i
= 0; i
< tz
->trips
.passive
.devices
.count
;
758 handle
= tz
->trips
.passive
.devices
.handles
[i
];
759 status
= acpi_bus_get_device(handle
, &dev
);
760 if (ACPI_SUCCESS(status
) && (dev
== device
)) {
761 result
= action(thermal
, trip
, cdev
);
768 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
769 if (!tz
->trips
.active
[i
].flags
.valid
)
773 j
< tz
->trips
.active
[i
].devices
.count
;
775 handle
= tz
->trips
.active
[i
].devices
.handles
[j
];
776 status
= acpi_bus_get_device(handle
, &dev
);
777 if (ACPI_SUCCESS(status
) && (dev
== device
)) {
778 result
= action(thermal
, trip
, cdev
);
785 for (i
= 0; i
< tz
->devices
.count
; i
++) {
786 handle
= tz
->devices
.handles
[i
];
787 status
= acpi_bus_get_device(handle
, &dev
);
788 if (ACPI_SUCCESS(status
) && (dev
== device
)) {
789 result
= action(thermal
, -1, cdev
);
800 acpi_thermal_bind_cooling_device(struct thermal_zone_device
*thermal
,
801 struct thermal_cooling_device
*cdev
)
803 return acpi_thermal_cooling_device_cb(thermal
, cdev
,
804 thermal_zone_bind_cooling_device
);
808 acpi_thermal_unbind_cooling_device(struct thermal_zone_device
*thermal
,
809 struct thermal_cooling_device
*cdev
)
811 return acpi_thermal_cooling_device_cb(thermal
, cdev
,
812 thermal_zone_unbind_cooling_device
);
815 static const struct thermal_zone_device_ops acpi_thermal_zone_ops
= {
816 .bind
= acpi_thermal_bind_cooling_device
,
817 .unbind
= acpi_thermal_unbind_cooling_device
,
818 .get_temp
= thermal_get_temp
,
819 .get_mode
= thermal_get_mode
,
820 .set_mode
= thermal_set_mode
,
821 .get_trip_type
= thermal_get_trip_type
,
822 .get_trip_temp
= thermal_get_trip_temp
,
823 .get_crit_temp
= thermal_get_crit_temp
,
824 .notify
= thermal_notify
,
827 static int acpi_thermal_register_thermal_zone(struct acpi_thermal
*tz
)
834 if (tz
->trips
.critical
.flags
.valid
)
837 if (tz
->trips
.hot
.flags
.valid
)
840 if (tz
->trips
.passive
.flags
.valid
)
843 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
&&
844 tz
->trips
.active
[i
].flags
.valid
; i
++, trips
++);
846 if (tz
->trips
.passive
.flags
.valid
)
848 thermal_zone_device_register("acpitz", trips
, 0, tz
,
849 &acpi_thermal_zone_ops
,
850 tz
->trips
.passive
.tc1
,
851 tz
->trips
.passive
.tc2
,
852 tz
->trips
.passive
.tsp
*100,
853 tz
->polling_frequency
*100);
856 thermal_zone_device_register("acpitz", trips
, 0, tz
,
857 &acpi_thermal_zone_ops
,
859 tz
->polling_frequency
*100);
860 if (IS_ERR(tz
->thermal_zone
))
863 result
= sysfs_create_link(&tz
->device
->dev
.kobj
,
864 &tz
->thermal_zone
->device
.kobj
, "thermal_zone");
868 result
= sysfs_create_link(&tz
->thermal_zone
->device
.kobj
,
869 &tz
->device
->dev
.kobj
, "device");
873 status
= acpi_attach_data(tz
->device
->handle
,
874 acpi_bus_private_data_handler
,
876 if (ACPI_FAILURE(status
)) {
877 printk(KERN_ERR PREFIX
878 "Error attaching device data\n");
884 dev_info(&tz
->device
->dev
, "registered as thermal_zone%d\n",
885 tz
->thermal_zone
->id
);
889 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal
*tz
)
891 sysfs_remove_link(&tz
->device
->dev
.kobj
, "thermal_zone");
892 sysfs_remove_link(&tz
->thermal_zone
->device
.kobj
, "device");
893 thermal_zone_device_unregister(tz
->thermal_zone
);
894 tz
->thermal_zone
= NULL
;
895 acpi_detach_data(tz
->device
->handle
, acpi_bus_private_data_handler
);
899 /* --------------------------------------------------------------------------
901 -------------------------------------------------------------------------- */
903 static void acpi_thermal_notify(struct acpi_device
*device
, u32 event
)
905 struct acpi_thermal
*tz
= acpi_driver_data(device
);
912 case ACPI_THERMAL_NOTIFY_TEMPERATURE
:
913 acpi_thermal_check(tz
);
915 case ACPI_THERMAL_NOTIFY_THRESHOLDS
:
916 acpi_thermal_trips_update(tz
, ACPI_TRIPS_REFRESH_THRESHOLDS
);
917 acpi_thermal_check(tz
);
918 acpi_bus_generate_proc_event(device
, event
, 0);
919 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
920 dev_name(&device
->dev
), event
, 0);
922 case ACPI_THERMAL_NOTIFY_DEVICES
:
923 acpi_thermal_trips_update(tz
, ACPI_TRIPS_REFRESH_DEVICES
);
924 acpi_thermal_check(tz
);
925 acpi_bus_generate_proc_event(device
, event
, 0);
926 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
927 dev_name(&device
->dev
), event
, 0);
930 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
931 "Unsupported event [0x%x]\n", event
));
936 static int acpi_thermal_get_info(struct acpi_thermal
*tz
)
944 /* Get trip points [_CRT, _PSV, etc.] (required) */
945 result
= acpi_thermal_get_trip_points(tz
);
949 /* Get temperature [_TMP] (required) */
950 result
= acpi_thermal_get_temperature(tz
);
954 /* Set the cooling mode [_SCP] to active cooling (default) */
955 result
= acpi_thermal_set_cooling_mode(tz
, ACPI_THERMAL_MODE_ACTIVE
);
957 tz
->flags
.cooling_mode
= 1;
959 /* Get default polling frequency [_TZP] (optional) */
961 tz
->polling_frequency
= tzp
;
963 acpi_thermal_get_polling_frequency(tz
);
969 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
970 * handles temperature values with a single decimal place. As a consequence,
971 * some implementations use an offset of 273.1 and others use an offset of
972 * 273.2. Try to find out which one is being used, to present the most
973 * accurate and visually appealing number.
975 * The heuristic below should work for all ACPI thermal zones which have a
976 * critical trip point with a value being a multiple of 0.5 degree Celsius.
978 static void acpi_thermal_guess_offset(struct acpi_thermal
*tz
)
980 if (tz
->trips
.critical
.flags
.valid
&&
981 (tz
->trips
.critical
.temperature
% 5) == 1)
982 tz
->kelvin_offset
= 2731;
984 tz
->kelvin_offset
= 2732;
987 static int acpi_thermal_add(struct acpi_device
*device
)
990 struct acpi_thermal
*tz
= NULL
;
996 tz
= kzalloc(sizeof(struct acpi_thermal
), GFP_KERNEL
);
1000 tz
->device
= device
;
1001 strcpy(tz
->name
, device
->pnp
.bus_id
);
1002 strcpy(acpi_device_name(device
), ACPI_THERMAL_DEVICE_NAME
);
1003 strcpy(acpi_device_class(device
), ACPI_THERMAL_CLASS
);
1004 device
->driver_data
= tz
;
1005 mutex_init(&tz
->lock
);
1008 result
= acpi_thermal_get_info(tz
);
1012 acpi_thermal_guess_offset(tz
);
1014 result
= acpi_thermal_register_thermal_zone(tz
);
1018 printk(KERN_INFO PREFIX
"%s [%s] (%ld C)\n",
1019 acpi_device_name(device
), acpi_device_bid(device
),
1020 KELVIN_TO_CELSIUS(tz
->temperature
));
1029 static int acpi_thermal_remove(struct acpi_device
*device
, int type
)
1031 struct acpi_thermal
*tz
= NULL
;
1033 if (!device
|| !acpi_driver_data(device
))
1036 tz
= acpi_driver_data(device
);
1038 acpi_thermal_unregister_thermal_zone(tz
);
1039 mutex_destroy(&tz
->lock
);
1044 static int acpi_thermal_resume(struct device
*dev
)
1046 struct acpi_thermal
*tz
;
1047 int i
, j
, power_state
, result
;
1052 tz
= acpi_driver_data(to_acpi_device(dev
));
1056 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
1057 if (!(&tz
->trips
.active
[i
]))
1059 if (!tz
->trips
.active
[i
].flags
.valid
)
1061 tz
->trips
.active
[i
].flags
.enabled
= 1;
1062 for (j
= 0; j
< tz
->trips
.active
[i
].devices
.count
; j
++) {
1063 result
= acpi_bus_update_power(
1064 tz
->trips
.active
[i
].devices
.handles
[j
],
1066 if (result
|| (power_state
!= ACPI_STATE_D0
)) {
1067 tz
->trips
.active
[i
].flags
.enabled
= 0;
1071 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
1074 acpi_thermal_check(tz
);
1079 static int thermal_act(const struct dmi_system_id
*d
) {
1082 printk(KERN_NOTICE
"ACPI: %s detected: "
1083 "disabling all active thermal trip points\n", d
->ident
);
1088 static int thermal_nocrt(const struct dmi_system_id
*d
) {
1090 printk(KERN_NOTICE
"ACPI: %s detected: "
1091 "disabling all critical thermal trip point actions.\n", d
->ident
);
1095 static int thermal_tzp(const struct dmi_system_id
*d
) {
1098 printk(KERN_NOTICE
"ACPI: %s detected: "
1099 "enabling thermal zone polling\n", d
->ident
);
1100 tzp
= 300; /* 300 dS = 30 Seconds */
1104 static int thermal_psv(const struct dmi_system_id
*d
) {
1107 printk(KERN_NOTICE
"ACPI: %s detected: "
1108 "disabling all passive thermal trip points\n", d
->ident
);
1114 static struct dmi_system_id thermal_dmi_table
[] __initdata
= {
1116 * Award BIOS on this AOpen makes thermal control almost worthless.
1117 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1120 .callback
= thermal_act
,
1121 .ident
= "AOpen i915GMm-HFS",
1123 DMI_MATCH(DMI_BOARD_VENDOR
, "AOpen"),
1124 DMI_MATCH(DMI_BOARD_NAME
, "i915GMm-HFS"),
1128 .callback
= thermal_psv
,
1129 .ident
= "AOpen i915GMm-HFS",
1131 DMI_MATCH(DMI_BOARD_VENDOR
, "AOpen"),
1132 DMI_MATCH(DMI_BOARD_NAME
, "i915GMm-HFS"),
1136 .callback
= thermal_tzp
,
1137 .ident
= "AOpen i915GMm-HFS",
1139 DMI_MATCH(DMI_BOARD_VENDOR
, "AOpen"),
1140 DMI_MATCH(DMI_BOARD_NAME
, "i915GMm-HFS"),
1144 .callback
= thermal_nocrt
,
1145 .ident
= "Gigabyte GA-7ZX",
1147 DMI_MATCH(DMI_BOARD_VENDOR
, "Gigabyte Technology Co., Ltd."),
1148 DMI_MATCH(DMI_BOARD_NAME
, "7ZX"),
1154 static int __init
acpi_thermal_init(void)
1158 dmi_check_system(thermal_dmi_table
);
1161 printk(KERN_NOTICE
"ACPI: thermal control disabled\n");
1165 result
= acpi_bus_register_driver(&acpi_thermal_driver
);
1172 static void __exit
acpi_thermal_exit(void)
1175 acpi_bus_unregister_driver(&acpi_thermal_driver
);
1180 module_init(acpi_thermal_init
);
1181 module_exit(acpi_thermal_exit
);