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/types.h>
39 #include <linux/proc_fs.h>
40 #include <linux/timer.h>
41 #include <linux/jiffies.h>
42 #include <linux/kmod.h>
43 #include <linux/seq_file.h>
44 #include <linux/reboot.h>
45 #include <asm/uaccess.h>
46 #include <linux/thermal.h>
47 #include <acpi/acpi_bus.h>
48 #include <acpi/acpi_drivers.h>
50 #define ACPI_THERMAL_CLASS "thermal_zone"
51 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
52 #define ACPI_THERMAL_FILE_STATE "state"
53 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
54 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
55 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
56 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
57 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
58 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
59 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82
60 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
61 #define ACPI_THERMAL_NOTIFY_HOT 0xF1
62 #define ACPI_THERMAL_MODE_ACTIVE 0x00
64 #define ACPI_THERMAL_MAX_ACTIVE 10
65 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
67 #define _COMPONENT ACPI_THERMAL_COMPONENT
68 ACPI_MODULE_NAME("thermal");
70 MODULE_AUTHOR("Paul Diefenbaugh");
71 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
72 MODULE_LICENSE("GPL");
75 module_param(act
, int, 0644);
76 MODULE_PARM_DESC(act
, "Disable or override all lowest active trip points.");
79 module_param(crt
, int, 0644);
80 MODULE_PARM_DESC(crt
, "Disable or lower all critical trip points.");
83 module_param(tzp
, int, 0444);
84 MODULE_PARM_DESC(tzp
, "Thermal zone polling frequency, in 1/10 seconds.");
87 module_param(nocrt
, int, 0);
88 MODULE_PARM_DESC(nocrt
, "Set to take no action upon ACPI thermal zone critical trips points.");
91 module_param(off
, int, 0);
92 MODULE_PARM_DESC(off
, "Set to disable ACPI thermal support.");
95 module_param(psv
, int, 0644);
96 MODULE_PARM_DESC(psv
, "Disable or override all passive trip points.");
98 static int acpi_thermal_add(struct acpi_device
*device
);
99 static int acpi_thermal_remove(struct acpi_device
*device
, int type
);
100 static int acpi_thermal_resume(struct acpi_device
*device
);
101 static int acpi_thermal_state_open_fs(struct inode
*inode
, struct file
*file
);
102 static int acpi_thermal_temp_open_fs(struct inode
*inode
, struct file
*file
);
103 static int acpi_thermal_trip_open_fs(struct inode
*inode
, struct file
*file
);
104 static int acpi_thermal_cooling_open_fs(struct inode
*inode
, struct file
*file
);
105 static ssize_t
acpi_thermal_write_cooling_mode(struct file
*,
106 const char __user
*, size_t,
108 static int acpi_thermal_polling_open_fs(struct inode
*inode
, struct file
*file
);
109 static ssize_t
acpi_thermal_write_polling(struct file
*, const char __user
*,
112 static const struct acpi_device_id thermal_device_ids
[] = {
113 {ACPI_THERMAL_HID
, 0},
116 MODULE_DEVICE_TABLE(acpi
, thermal_device_ids
);
118 static struct acpi_driver acpi_thermal_driver
= {
120 .class = ACPI_THERMAL_CLASS
,
121 .ids
= thermal_device_ids
,
123 .add
= acpi_thermal_add
,
124 .remove
= acpi_thermal_remove
,
125 .resume
= acpi_thermal_resume
,
129 struct acpi_thermal_state
{
138 struct acpi_thermal_state_flags
{
144 struct acpi_thermal_critical
{
145 struct acpi_thermal_state_flags flags
;
146 unsigned long temperature
;
149 struct acpi_thermal_hot
{
150 struct acpi_thermal_state_flags flags
;
151 unsigned long temperature
;
154 struct acpi_thermal_passive
{
155 struct acpi_thermal_state_flags flags
;
156 unsigned long temperature
;
160 struct acpi_handle_list devices
;
163 struct acpi_thermal_active
{
164 struct acpi_thermal_state_flags flags
;
165 unsigned long temperature
;
166 struct acpi_handle_list devices
;
169 struct acpi_thermal_trips
{
170 struct acpi_thermal_critical critical
;
171 struct acpi_thermal_hot hot
;
172 struct acpi_thermal_passive passive
;
173 struct acpi_thermal_active active
[ACPI_THERMAL_MAX_ACTIVE
];
176 struct acpi_thermal_flags
{
177 u8 cooling_mode
:1; /* _SCP */
178 u8 devices
:1; /* _TZD */
182 struct acpi_thermal
{
183 struct acpi_device
* device
;
185 unsigned long temperature
;
186 unsigned long last_temperature
;
187 unsigned long polling_frequency
;
189 struct acpi_thermal_flags flags
;
190 struct acpi_thermal_state state
;
191 struct acpi_thermal_trips trips
;
192 struct acpi_handle_list devices
;
193 struct timer_list timer
;
194 struct thermal_zone_device
*thermal_zone
;
199 static const struct file_operations acpi_thermal_state_fops
= {
200 .owner
= THIS_MODULE
,
201 .open
= acpi_thermal_state_open_fs
,
204 .release
= single_release
,
207 static const struct file_operations acpi_thermal_temp_fops
= {
208 .owner
= THIS_MODULE
,
209 .open
= acpi_thermal_temp_open_fs
,
212 .release
= single_release
,
215 static const struct file_operations acpi_thermal_trip_fops
= {
216 .owner
= THIS_MODULE
,
217 .open
= acpi_thermal_trip_open_fs
,
220 .release
= single_release
,
223 static const struct file_operations acpi_thermal_cooling_fops
= {
224 .owner
= THIS_MODULE
,
225 .open
= acpi_thermal_cooling_open_fs
,
227 .write
= acpi_thermal_write_cooling_mode
,
229 .release
= single_release
,
232 static const struct file_operations acpi_thermal_polling_fops
= {
233 .owner
= THIS_MODULE
,
234 .open
= acpi_thermal_polling_open_fs
,
236 .write
= acpi_thermal_write_polling
,
238 .release
= single_release
,
241 /* --------------------------------------------------------------------------
242 Thermal Zone Management
243 -------------------------------------------------------------------------- */
245 static int acpi_thermal_get_temperature(struct acpi_thermal
*tz
)
247 acpi_status status
= AE_OK
;
248 unsigned long long tmp
;
253 tz
->last_temperature
= tz
->temperature
;
255 status
= acpi_evaluate_integer(tz
->device
->handle
, "_TMP", NULL
, &tmp
);
256 if (ACPI_FAILURE(status
))
259 tz
->temperature
= tmp
;
260 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Temperature is %lu dK\n",
266 static int acpi_thermal_get_polling_frequency(struct acpi_thermal
*tz
)
268 acpi_status status
= AE_OK
;
269 unsigned long long tmp
;
274 status
= acpi_evaluate_integer(tz
->device
->handle
, "_TZP", NULL
, &tmp
);
275 if (ACPI_FAILURE(status
))
278 tz
->polling_frequency
= tmp
;
279 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Polling frequency is %lu dS\n",
280 tz
->polling_frequency
));
285 static int acpi_thermal_set_polling(struct acpi_thermal
*tz
, int seconds
)
291 tz
->polling_frequency
= seconds
* 10; /* Convert value to deci-seconds */
293 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
294 "Polling frequency set to %lu seconds\n",
295 tz
->polling_frequency
/10));
300 static int acpi_thermal_set_cooling_mode(struct acpi_thermal
*tz
, int mode
)
302 acpi_status status
= AE_OK
;
303 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
304 struct acpi_object_list arg_list
= { 1, &arg0
};
305 acpi_handle handle
= NULL
;
311 status
= acpi_get_handle(tz
->device
->handle
, "_SCP", &handle
);
312 if (ACPI_FAILURE(status
)) {
313 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "_SCP not present\n"));
317 arg0
.integer
.value
= mode
;
319 status
= acpi_evaluate_object(handle
, NULL
, &arg_list
, NULL
);
320 if (ACPI_FAILURE(status
))
326 #define ACPI_TRIPS_CRITICAL 0x01
327 #define ACPI_TRIPS_HOT 0x02
328 #define ACPI_TRIPS_PASSIVE 0x04
329 #define ACPI_TRIPS_ACTIVE 0x08
330 #define ACPI_TRIPS_DEVICES 0x10
332 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
333 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
335 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
336 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
340 * This exception is thrown out in two cases:
341 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
342 * when re-evaluating the AML code.
343 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
344 * We need to re-bind the cooling devices of a thermal zone when this occurs.
346 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
348 if (flags != ACPI_TRIPS_INIT) \
349 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
350 "ACPI thermal trip point %s changed\n" \
351 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
354 static int acpi_thermal_trips_update(struct acpi_thermal
*tz
, int flag
)
356 acpi_status status
= AE_OK
;
357 unsigned long long tmp
;
358 struct acpi_handle_list devices
;
362 /* Critical Shutdown (required) */
363 if (flag
& ACPI_TRIPS_CRITICAL
) {
364 status
= acpi_evaluate_integer(tz
->device
->handle
,
366 tz
->trips
.critical
.temperature
= tmp
;
368 * Treat freezing temperatures as invalid as well; some
369 * BIOSes return really low values and cause reboots at startup.
370 * Below zero (Celcius) values clearly aren't right for sure..
371 * ... so lets discard those as invalid.
373 if (ACPI_FAILURE(status
) ||
374 tz
->trips
.critical
.temperature
<= 2732) {
375 tz
->trips
.critical
.flags
.valid
= 0;
376 ACPI_EXCEPTION((AE_INFO
, status
,
377 "No or invalid critical threshold"));
380 tz
->trips
.critical
.flags
.valid
= 1;
381 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
382 "Found critical threshold [%lu]\n",
383 tz
->trips
.critical
.temperature
));
385 if (tz
->trips
.critical
.flags
.valid
== 1) {
387 tz
->trips
.critical
.flags
.valid
= 0;
388 } else if (crt
> 0) {
389 unsigned long crt_k
= CELSIUS_TO_KELVIN(crt
);
391 * Allow override critical threshold
393 if (crt_k
> tz
->trips
.critical
.temperature
)
394 printk(KERN_WARNING PREFIX
395 "Critical threshold %d C\n", crt
);
396 tz
->trips
.critical
.temperature
= crt_k
;
401 /* Critical Sleep (optional) */
402 if (flag
& ACPI_TRIPS_HOT
) {
403 status
= acpi_evaluate_integer(tz
->device
->handle
,
405 if (ACPI_FAILURE(status
)) {
406 tz
->trips
.hot
.flags
.valid
= 0;
407 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
408 "No hot threshold\n"));
410 tz
->trips
.hot
.temperature
= tmp
;
411 tz
->trips
.hot
.flags
.valid
= 1;
412 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
413 "Found hot threshold [%lu]\n",
414 tz
->trips
.critical
.temperature
));
418 /* Passive (optional) */
419 if (((flag
& ACPI_TRIPS_PASSIVE
) && tz
->trips
.passive
.flags
.valid
) ||
420 (flag
== ACPI_TRIPS_INIT
)) {
421 valid
= tz
->trips
.passive
.flags
.valid
;
424 } else if (psv
> 0) {
425 tmp
= CELSIUS_TO_KELVIN(psv
);
428 status
= acpi_evaluate_integer(tz
->device
->handle
,
432 if (ACPI_FAILURE(status
))
433 tz
->trips
.passive
.flags
.valid
= 0;
435 tz
->trips
.passive
.temperature
= tmp
;
436 tz
->trips
.passive
.flags
.valid
= 1;
437 if (flag
== ACPI_TRIPS_INIT
) {
438 status
= acpi_evaluate_integer(
439 tz
->device
->handle
, "_TC1",
441 if (ACPI_FAILURE(status
))
442 tz
->trips
.passive
.flags
.valid
= 0;
444 tz
->trips
.passive
.tc1
= tmp
;
445 status
= acpi_evaluate_integer(
446 tz
->device
->handle
, "_TC2",
448 if (ACPI_FAILURE(status
))
449 tz
->trips
.passive
.flags
.valid
= 0;
451 tz
->trips
.passive
.tc2
= tmp
;
452 status
= acpi_evaluate_integer(
453 tz
->device
->handle
, "_TSP",
455 if (ACPI_FAILURE(status
))
456 tz
->trips
.passive
.flags
.valid
= 0;
458 tz
->trips
.passive
.tsp
= tmp
;
462 if ((flag
& ACPI_TRIPS_DEVICES
) && tz
->trips
.passive
.flags
.valid
) {
463 memset(&devices
, 0, sizeof(struct acpi_handle_list
));
464 status
= acpi_evaluate_reference(tz
->device
->handle
, "_PSL",
466 if (ACPI_FAILURE(status
)) {
467 printk(KERN_WARNING PREFIX
468 "Invalid passive threshold\n");
469 tz
->trips
.passive
.flags
.valid
= 0;
472 tz
->trips
.passive
.flags
.valid
= 1;
474 if (memcmp(&tz
->trips
.passive
.devices
, &devices
,
475 sizeof(struct acpi_handle_list
))) {
476 memcpy(&tz
->trips
.passive
.devices
, &devices
,
477 sizeof(struct acpi_handle_list
));
478 ACPI_THERMAL_TRIPS_EXCEPTION(flag
, "device");
481 if ((flag
& ACPI_TRIPS_PASSIVE
) || (flag
& ACPI_TRIPS_DEVICES
)) {
482 if (valid
!= tz
->trips
.passive
.flags
.valid
)
483 ACPI_THERMAL_TRIPS_EXCEPTION(flag
, "state");
486 /* Active (optional) */
487 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
488 char name
[5] = { '_', 'A', 'C', ('0' + i
), '\0' };
489 valid
= tz
->trips
.active
[i
].flags
.valid
;
492 break; /* disable all active trip points */
494 if ((flag
== ACPI_TRIPS_INIT
) || ((flag
& ACPI_TRIPS_ACTIVE
) &&
495 tz
->trips
.active
[i
].flags
.valid
)) {
496 status
= acpi_evaluate_integer(tz
->device
->handle
,
498 if (ACPI_FAILURE(status
)) {
499 tz
->trips
.active
[i
].flags
.valid
= 0;
505 tz
->trips
.active
[0].temperature
=
506 CELSIUS_TO_KELVIN(act
);
509 * Don't allow override higher than
510 * the next higher trip point
512 tz
->trips
.active
[i
- 1].temperature
=
513 (tz
->trips
.active
[i
- 2].temperature
<
514 CELSIUS_TO_KELVIN(act
) ?
515 tz
->trips
.active
[i
- 2].temperature
:
516 CELSIUS_TO_KELVIN(act
));
519 tz
->trips
.active
[i
].temperature
= tmp
;
520 tz
->trips
.active
[i
].flags
.valid
= 1;
525 if ((flag
& ACPI_TRIPS_DEVICES
) && tz
->trips
.active
[i
].flags
.valid
) {
526 memset(&devices
, 0, sizeof(struct acpi_handle_list
));
527 status
= acpi_evaluate_reference(tz
->device
->handle
,
528 name
, NULL
, &devices
);
529 if (ACPI_FAILURE(status
)) {
530 printk(KERN_WARNING PREFIX
531 "Invalid active%d threshold\n", i
);
532 tz
->trips
.active
[i
].flags
.valid
= 0;
535 tz
->trips
.active
[i
].flags
.valid
= 1;
537 if (memcmp(&tz
->trips
.active
[i
].devices
, &devices
,
538 sizeof(struct acpi_handle_list
))) {
539 memcpy(&tz
->trips
.active
[i
].devices
, &devices
,
540 sizeof(struct acpi_handle_list
));
541 ACPI_THERMAL_TRIPS_EXCEPTION(flag
, "device");
544 if ((flag
& ACPI_TRIPS_ACTIVE
) || (flag
& ACPI_TRIPS_DEVICES
))
545 if (valid
!= tz
->trips
.active
[i
].flags
.valid
)
546 ACPI_THERMAL_TRIPS_EXCEPTION(flag
, "state");
548 if (!tz
->trips
.active
[i
].flags
.valid
)
552 if (flag
& ACPI_TRIPS_DEVICES
) {
553 memset(&devices
, 0, sizeof(struct acpi_handle_list
));
554 status
= acpi_evaluate_reference(tz
->device
->handle
, "_TZD",
556 if (memcmp(&tz
->devices
, &devices
,
557 sizeof(struct acpi_handle_list
))) {
558 memcpy(&tz
->devices
, &devices
,
559 sizeof(struct acpi_handle_list
));
560 ACPI_THERMAL_TRIPS_EXCEPTION(flag
, "device");
567 static int acpi_thermal_get_trip_points(struct acpi_thermal
*tz
)
569 return acpi_thermal_trips_update(tz
, ACPI_TRIPS_INIT
);
572 static int acpi_thermal_critical(struct acpi_thermal
*tz
)
574 if (!tz
|| !tz
->trips
.critical
.flags
.valid
)
577 if (tz
->temperature
>= tz
->trips
.critical
.temperature
) {
578 printk(KERN_WARNING PREFIX
"Critical trip point\n");
579 tz
->trips
.critical
.flags
.enabled
= 1;
580 } else if (tz
->trips
.critical
.flags
.enabled
)
581 tz
->trips
.critical
.flags
.enabled
= 0;
583 acpi_bus_generate_proc_event(tz
->device
, ACPI_THERMAL_NOTIFY_CRITICAL
,
584 tz
->trips
.critical
.flags
.enabled
);
585 acpi_bus_generate_netlink_event(tz
->device
->pnp
.device_class
,
586 dev_name(&tz
->device
->dev
),
587 ACPI_THERMAL_NOTIFY_CRITICAL
,
588 tz
->trips
.critical
.flags
.enabled
);
590 /* take no action if nocrt is set */
593 "Critical temperature reached (%ld C), shutting down.\n",
594 KELVIN_TO_CELSIUS(tz
->temperature
));
595 orderly_poweroff(true);
601 static int acpi_thermal_hot(struct acpi_thermal
*tz
)
603 if (!tz
|| !tz
->trips
.hot
.flags
.valid
)
606 if (tz
->temperature
>= tz
->trips
.hot
.temperature
) {
607 printk(KERN_WARNING PREFIX
"Hot trip point\n");
608 tz
->trips
.hot
.flags
.enabled
= 1;
609 } else if (tz
->trips
.hot
.flags
.enabled
)
610 tz
->trips
.hot
.flags
.enabled
= 0;
612 acpi_bus_generate_proc_event(tz
->device
, ACPI_THERMAL_NOTIFY_HOT
,
613 tz
->trips
.hot
.flags
.enabled
);
614 acpi_bus_generate_netlink_event(tz
->device
->pnp
.device_class
,
615 dev_name(&tz
->device
->dev
),
616 ACPI_THERMAL_NOTIFY_HOT
,
617 tz
->trips
.hot
.flags
.enabled
);
619 /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
624 static void acpi_thermal_passive(struct acpi_thermal
*tz
)
627 struct acpi_thermal_passive
*passive
= NULL
;
632 if (!tz
|| !tz
->trips
.passive
.flags
.valid
)
635 passive
= &(tz
->trips
.passive
);
640 * Calculate the thermal trend (using the passive cooling equation)
641 * and modify the performance limit for all passive cooling devices
642 * accordingly. Note that we assume symmetry.
644 if (tz
->temperature
>= passive
->temperature
) {
646 (passive
->tc1
* (tz
->temperature
- tz
->last_temperature
)) +
647 (passive
->tc2
* (tz
->temperature
- passive
->temperature
));
648 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
649 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
650 trend
, passive
->tc1
, tz
->temperature
,
651 tz
->last_temperature
, passive
->tc2
,
652 tz
->temperature
, passive
->temperature
));
653 passive
->flags
.enabled
= 1;
656 for (i
= 0; i
< passive
->devices
.count
; i
++)
657 acpi_processor_set_thermal_limit(passive
->
660 ACPI_PROCESSOR_LIMIT_INCREMENT
);
662 else if (trend
< 0) {
663 for (i
= 0; i
< passive
->devices
.count
; i
++)
665 * assume that we are on highest
666 * freq/lowest thrott and can leave
667 * passive mode, even in error case
669 if (!acpi_processor_set_thermal_limit
670 (passive
->devices
.handles
[i
],
671 ACPI_PROCESSOR_LIMIT_DECREMENT
))
674 * Leave cooling mode, even if the temp might
675 * higher than trip point This is because some
676 * machines might have long thermal polling
677 * frequencies (tsp) defined. We will fall back
678 * into passive mode in next cycle (probably quicker)
681 passive
->flags
.enabled
= 0;
682 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
683 "Disabling passive cooling, still above threshold,"
684 " but we are cooling down\n"));
693 * Implement passive cooling hysteresis to slowly increase performance
694 * and avoid thrashing around the passive trip point. Note that we
697 if (!passive
->flags
.enabled
)
699 for (i
= 0; i
< passive
->devices
.count
; i
++)
700 if (!acpi_processor_set_thermal_limit
701 (passive
->devices
.handles
[i
],
702 ACPI_PROCESSOR_LIMIT_DECREMENT
))
705 passive
->flags
.enabled
= 0;
706 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
707 "Disabling passive cooling (zone is cool)\n"));
711 static void acpi_thermal_active(struct acpi_thermal
*tz
)
714 struct acpi_thermal_active
*active
= NULL
;
717 unsigned long maxtemp
= 0;
723 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
724 active
= &(tz
->trips
.active
[i
]);
725 if (!active
|| !active
->flags
.valid
)
727 if (tz
->temperature
>= active
->temperature
) {
731 * If not already enabled, turn ON all cooling devices
732 * associated with this active threshold.
734 if (active
->temperature
> maxtemp
)
735 tz
->state
.active_index
= i
;
736 maxtemp
= active
->temperature
;
737 if (active
->flags
.enabled
)
739 for (j
= 0; j
< active
->devices
.count
; j
++) {
741 acpi_bus_set_power(active
->devices
.
745 printk(KERN_WARNING PREFIX
746 "Unable to turn cooling device [%p] 'on'\n",
751 active
->flags
.enabled
= 1;
752 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
753 "Cooling device [%p] now 'on'\n",
754 active
->devices
.handles
[j
]));
758 if (!active
->flags
.enabled
)
763 * Turn OFF all cooling devices associated with this
766 for (j
= 0; j
< active
->devices
.count
; j
++) {
767 result
= acpi_bus_set_power(active
->devices
.handles
[j
],
770 printk(KERN_WARNING PREFIX
771 "Unable to turn cooling device [%p] 'off'\n",
772 active
->devices
.handles
[j
]);
775 active
->flags
.enabled
= 0;
776 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
777 "Cooling device [%p] now 'off'\n",
778 active
->devices
.handles
[j
]));
783 static void acpi_thermal_check(void *context
);
785 static void acpi_thermal_run(unsigned long data
)
787 struct acpi_thermal
*tz
= (struct acpi_thermal
*)data
;
789 acpi_os_execute(OSL_GPE_HANDLER
, acpi_thermal_check
, (void *)data
);
792 static void acpi_thermal_active_off(void *data
)
795 struct acpi_thermal
*tz
= data
;
798 struct acpi_thermal_active
*active
= NULL
;
801 printk(KERN_ERR PREFIX
"Invalid (NULL) context\n");
805 result
= acpi_thermal_get_temperature(tz
);
809 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
810 active
= &(tz
->trips
.active
[i
]);
811 if (!active
|| !active
->flags
.valid
)
813 if (tz
->temperature
>= active
->temperature
) {
815 * If the thermal temperature is greater than the
816 * active threshod, unnecessary to turn off the
817 * the active cooling device.
824 * Turn OFF all cooling devices associated with this
827 for (j
= 0; j
< active
->devices
.count
; j
++)
828 result
= acpi_bus_set_power(active
->devices
.handles
[j
],
833 static void acpi_thermal_check(void *data
)
836 struct acpi_thermal
*tz
= data
;
837 unsigned long sleep_time
= 0;
838 unsigned long timeout_jiffies
= 0;
840 struct acpi_thermal_state state
;
844 printk(KERN_ERR PREFIX
"Invalid (NULL) context\n");
848 /* Check if someone else is already running */
849 if (!mutex_trylock(&tz
->lock
))
854 result
= acpi_thermal_get_temperature(tz
);
861 memset(&tz
->state
, 0, sizeof(tz
->state
));
866 * Compare the current temperature to the trip point values to see
867 * if we've entered one of the thermal policy states. Note that
868 * this function determines when a state is entered, but the
869 * individual policy decides when it is exited (e.g. hysteresis).
871 if (tz
->trips
.critical
.flags
.valid
)
873 (tz
->temperature
>= tz
->trips
.critical
.temperature
);
874 if (tz
->trips
.hot
.flags
.valid
)
875 state
.hot
|= (tz
->temperature
>= tz
->trips
.hot
.temperature
);
876 if (tz
->trips
.passive
.flags
.valid
)
878 (tz
->temperature
>= tz
->trips
.passive
.temperature
);
879 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
880 if (tz
->trips
.active
[i
].flags
.valid
)
883 tz
->trips
.active
[i
].temperature
);
888 * Separated from the above check to allow individual policy to
889 * determine when to exit a given state.
892 acpi_thermal_critical(tz
);
894 acpi_thermal_hot(tz
);
896 acpi_thermal_passive(tz
);
898 acpi_thermal_active(tz
);
903 * Again, separated from the above two to allow independent policy
906 tz
->state
.critical
= tz
->trips
.critical
.flags
.enabled
;
907 tz
->state
.hot
= tz
->trips
.hot
.flags
.enabled
;
908 tz
->state
.passive
= tz
->trips
.passive
.flags
.enabled
;
909 tz
->state
.active
= 0;
910 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
911 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
914 * Calculate Sleep Time
915 * --------------------
916 * If we're in the passive state, use _TSP's value. Otherwise
917 * use the default polling frequency (e.g. _TZP). If no polling
918 * frequency is specified then we'll wait forever (at least until
919 * a thermal event occurs). Note that _TSP and _TZD values are
920 * given in 1/10th seconds (we must covert to milliseconds).
922 if (tz
->state
.passive
) {
923 sleep_time
= tz
->trips
.passive
.tsp
* 100;
924 timeout_jiffies
= jiffies
+ (HZ
* sleep_time
) / 1000;
925 } else if (tz
->polling_frequency
> 0) {
926 sleep_time
= tz
->polling_frequency
* 100;
927 timeout_jiffies
= round_jiffies(jiffies
+ (HZ
* sleep_time
) / 1000);
930 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "%s: temperature[%lu] sleep[%lu]\n",
931 tz
->name
, tz
->temperature
, sleep_time
));
938 if (timer_pending(&(tz
->timer
)))
939 del_timer(&(tz
->timer
));
941 if (timer_pending(&(tz
->timer
)))
942 mod_timer(&(tz
->timer
), timeout_jiffies
);
944 tz
->timer
.data
= (unsigned long)tz
;
945 tz
->timer
.function
= acpi_thermal_run
;
946 tz
->timer
.expires
= timeout_jiffies
;
947 add_timer(&(tz
->timer
));
951 mutex_unlock(&tz
->lock
);
954 /* sys I/F for generic thermal sysfs support */
955 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
957 static int thermal_get_temp(struct thermal_zone_device
*thermal
,
960 struct acpi_thermal
*tz
= thermal
->devdata
;
966 result
= acpi_thermal_get_temperature(tz
);
970 *temp
= KELVIN_TO_MILLICELSIUS(tz
->temperature
);
974 static const char enabled
[] = "kernel";
975 static const char disabled
[] = "user";
976 static int thermal_get_mode(struct thermal_zone_device
*thermal
,
977 enum thermal_device_mode
*mode
)
979 struct acpi_thermal
*tz
= thermal
->devdata
;
984 *mode
= tz
->tz_enabled
? THERMAL_DEVICE_ENABLED
:
985 THERMAL_DEVICE_DISABLED
;
990 static int thermal_set_mode(struct thermal_zone_device
*thermal
,
991 enum thermal_device_mode mode
)
993 struct acpi_thermal
*tz
= thermal
->devdata
;
1000 * enable/disable thermal management from ACPI thermal driver
1002 if (mode
== THERMAL_DEVICE_ENABLED
)
1004 else if (mode
== THERMAL_DEVICE_DISABLED
)
1009 if (enable
!= tz
->tz_enabled
) {
1010 tz
->tz_enabled
= enable
;
1011 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1012 "%s ACPI thermal control\n",
1013 tz
->tz_enabled
? enabled
: disabled
));
1014 acpi_thermal_check(tz
);
1019 static int thermal_get_trip_type(struct thermal_zone_device
*thermal
,
1020 int trip
, enum thermal_trip_type
*type
)
1022 struct acpi_thermal
*tz
= thermal
->devdata
;
1025 if (!tz
|| trip
< 0)
1028 if (tz
->trips
.critical
.flags
.valid
) {
1030 *type
= THERMAL_TRIP_CRITICAL
;
1036 if (tz
->trips
.hot
.flags
.valid
) {
1038 *type
= THERMAL_TRIP_HOT
;
1044 if (tz
->trips
.passive
.flags
.valid
) {
1046 *type
= THERMAL_TRIP_PASSIVE
;
1052 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
&&
1053 tz
->trips
.active
[i
].flags
.valid
; i
++) {
1055 *type
= THERMAL_TRIP_ACTIVE
;
1064 static int thermal_get_trip_temp(struct thermal_zone_device
*thermal
,
1065 int trip
, unsigned long *temp
)
1067 struct acpi_thermal
*tz
= thermal
->devdata
;
1070 if (!tz
|| trip
< 0)
1073 if (tz
->trips
.critical
.flags
.valid
) {
1075 *temp
= KELVIN_TO_MILLICELSIUS(
1076 tz
->trips
.critical
.temperature
);
1082 if (tz
->trips
.hot
.flags
.valid
) {
1084 *temp
= KELVIN_TO_MILLICELSIUS(
1085 tz
->trips
.hot
.temperature
);
1091 if (tz
->trips
.passive
.flags
.valid
) {
1093 *temp
= KELVIN_TO_MILLICELSIUS(
1094 tz
->trips
.passive
.temperature
);
1100 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
&&
1101 tz
->trips
.active
[i
].flags
.valid
; i
++) {
1103 *temp
= KELVIN_TO_MILLICELSIUS(
1104 tz
->trips
.active
[i
].temperature
);
1113 static int thermal_get_crit_temp(struct thermal_zone_device
*thermal
,
1114 unsigned long *temperature
) {
1115 struct acpi_thermal
*tz
= thermal
->devdata
;
1117 if (tz
->trips
.critical
.flags
.valid
) {
1118 *temperature
= KELVIN_TO_MILLICELSIUS(
1119 tz
->trips
.critical
.temperature
);
1125 typedef int (*cb
)(struct thermal_zone_device
*, int,
1126 struct thermal_cooling_device
*);
1127 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device
*thermal
,
1128 struct thermal_cooling_device
*cdev
,
1131 struct acpi_device
*device
= cdev
->devdata
;
1132 struct acpi_thermal
*tz
= thermal
->devdata
;
1133 struct acpi_device
*dev
;
1141 if (tz
->trips
.critical
.flags
.valid
)
1144 if (tz
->trips
.hot
.flags
.valid
)
1147 if (tz
->trips
.passive
.flags
.valid
) {
1149 for (i
= 0; i
< tz
->trips
.passive
.devices
.count
;
1151 handle
= tz
->trips
.passive
.devices
.handles
[i
];
1152 status
= acpi_bus_get_device(handle
, &dev
);
1153 if (ACPI_SUCCESS(status
) && (dev
== device
)) {
1154 result
= action(thermal
, trip
, cdev
);
1161 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
1162 if (!tz
->trips
.active
[i
].flags
.valid
)
1166 j
< tz
->trips
.active
[i
].devices
.count
;
1168 handle
= tz
->trips
.active
[i
].devices
.handles
[j
];
1169 status
= acpi_bus_get_device(handle
, &dev
);
1170 if (ACPI_SUCCESS(status
) && (dev
== device
)) {
1171 result
= action(thermal
, trip
, cdev
);
1178 for (i
= 0; i
< tz
->devices
.count
; i
++) {
1179 handle
= tz
->devices
.handles
[i
];
1180 status
= acpi_bus_get_device(handle
, &dev
);
1181 if (ACPI_SUCCESS(status
) && (dev
== device
)) {
1182 result
= action(thermal
, -1, cdev
);
1193 acpi_thermal_bind_cooling_device(struct thermal_zone_device
*thermal
,
1194 struct thermal_cooling_device
*cdev
)
1196 return acpi_thermal_cooling_device_cb(thermal
, cdev
,
1197 thermal_zone_bind_cooling_device
);
1201 acpi_thermal_unbind_cooling_device(struct thermal_zone_device
*thermal
,
1202 struct thermal_cooling_device
*cdev
)
1204 return acpi_thermal_cooling_device_cb(thermal
, cdev
,
1205 thermal_zone_unbind_cooling_device
);
1208 static struct thermal_zone_device_ops acpi_thermal_zone_ops
= {
1209 .bind
= acpi_thermal_bind_cooling_device
,
1210 .unbind
= acpi_thermal_unbind_cooling_device
,
1211 .get_temp
= thermal_get_temp
,
1212 .get_mode
= thermal_get_mode
,
1213 .set_mode
= thermal_set_mode
,
1214 .get_trip_type
= thermal_get_trip_type
,
1215 .get_trip_temp
= thermal_get_trip_temp
,
1216 .get_crit_temp
= thermal_get_crit_temp
,
1219 static int acpi_thermal_register_thermal_zone(struct acpi_thermal
*tz
)
1226 if (tz
->trips
.critical
.flags
.valid
)
1229 if (tz
->trips
.hot
.flags
.valid
)
1232 if (tz
->trips
.passive
.flags
.valid
)
1235 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
&&
1236 tz
->trips
.active
[i
].flags
.valid
; i
++, trips
++);
1237 tz
->thermal_zone
= thermal_zone_device_register("acpitz",
1238 trips
, tz
, &acpi_thermal_zone_ops
);
1239 if (IS_ERR(tz
->thermal_zone
))
1242 result
= sysfs_create_link(&tz
->device
->dev
.kobj
,
1243 &tz
->thermal_zone
->device
.kobj
, "thermal_zone");
1247 result
= sysfs_create_link(&tz
->thermal_zone
->device
.kobj
,
1248 &tz
->device
->dev
.kobj
, "device");
1252 status
= acpi_attach_data(tz
->device
->handle
,
1253 acpi_bus_private_data_handler
,
1255 if (ACPI_FAILURE(status
)) {
1256 printk(KERN_ERR PREFIX
1257 "Error attaching device data\n");
1263 dev_info(&tz
->device
->dev
, "registered as thermal_zone%d\n",
1264 tz
->thermal_zone
->id
);
1268 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal
*tz
)
1270 sysfs_remove_link(&tz
->device
->dev
.kobj
, "thermal_zone");
1271 sysfs_remove_link(&tz
->thermal_zone
->device
.kobj
, "device");
1272 thermal_zone_device_unregister(tz
->thermal_zone
);
1273 tz
->thermal_zone
= NULL
;
1274 acpi_detach_data(tz
->device
->handle
, acpi_bus_private_data_handler
);
1278 /* --------------------------------------------------------------------------
1279 FS Interface (/proc)
1280 -------------------------------------------------------------------------- */
1282 static struct proc_dir_entry
*acpi_thermal_dir
;
1284 static int acpi_thermal_state_seq_show(struct seq_file
*seq
, void *offset
)
1286 struct acpi_thermal
*tz
= seq
->private;
1292 seq_puts(seq
, "state: ");
1294 if (!tz
->state
.critical
&& !tz
->state
.hot
&& !tz
->state
.passive
1295 && !tz
->state
.active
)
1296 seq_puts(seq
, "ok\n");
1298 if (tz
->state
.critical
)
1299 seq_puts(seq
, "critical ");
1301 seq_puts(seq
, "hot ");
1302 if (tz
->state
.passive
)
1303 seq_puts(seq
, "passive ");
1304 if (tz
->state
.active
)
1305 seq_printf(seq
, "active[%d]", tz
->state
.active_index
);
1306 seq_puts(seq
, "\n");
1313 static int acpi_thermal_state_open_fs(struct inode
*inode
, struct file
*file
)
1315 return single_open(file
, acpi_thermal_state_seq_show
, PDE(inode
)->data
);
1318 static int acpi_thermal_temp_seq_show(struct seq_file
*seq
, void *offset
)
1321 struct acpi_thermal
*tz
= seq
->private;
1327 result
= acpi_thermal_get_temperature(tz
);
1331 seq_printf(seq
, "temperature: %ld C\n",
1332 KELVIN_TO_CELSIUS(tz
->temperature
));
1338 static int acpi_thermal_temp_open_fs(struct inode
*inode
, struct file
*file
)
1340 return single_open(file
, acpi_thermal_temp_seq_show
, PDE(inode
)->data
);
1343 static int acpi_thermal_trip_seq_show(struct seq_file
*seq
, void *offset
)
1345 struct acpi_thermal
*tz
= seq
->private;
1346 struct acpi_device
*device
;
1356 if (tz
->trips
.critical
.flags
.valid
)
1357 seq_printf(seq
, "critical (S5): %ld C%s",
1358 KELVIN_TO_CELSIUS(tz
->trips
.critical
.temperature
),
1359 nocrt
? " <disabled>\n" : "\n");
1361 if (tz
->trips
.hot
.flags
.valid
)
1362 seq_printf(seq
, "hot (S4): %ld C%s",
1363 KELVIN_TO_CELSIUS(tz
->trips
.hot
.temperature
),
1364 nocrt
? " <disabled>\n" : "\n");
1366 if (tz
->trips
.passive
.flags
.valid
) {
1368 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1369 KELVIN_TO_CELSIUS(tz
->trips
.passive
.temperature
),
1370 tz
->trips
.passive
.tc1
, tz
->trips
.passive
.tc2
,
1371 tz
->trips
.passive
.tsp
);
1372 for (j
= 0; j
< tz
->trips
.passive
.devices
.count
; j
++) {
1373 status
= acpi_bus_get_device(tz
->trips
.passive
.devices
.
1374 handles
[j
], &device
);
1375 seq_printf(seq
, "%4.4s ", status
? "" :
1376 acpi_device_bid(device
));
1378 seq_puts(seq
, "\n");
1381 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
1382 if (!(tz
->trips
.active
[i
].flags
.valid
))
1384 seq_printf(seq
, "active[%d]: %ld C: devices=",
1386 KELVIN_TO_CELSIUS(tz
->trips
.active
[i
].temperature
));
1387 for (j
= 0; j
< tz
->trips
.active
[i
].devices
.count
; j
++){
1388 status
= acpi_bus_get_device(tz
->trips
.active
[i
].
1391 seq_printf(seq
, "%4.4s ", status
? "" :
1392 acpi_device_bid(device
));
1394 seq_puts(seq
, "\n");
1401 static int acpi_thermal_trip_open_fs(struct inode
*inode
, struct file
*file
)
1403 return single_open(file
, acpi_thermal_trip_seq_show
, PDE(inode
)->data
);
1406 static int acpi_thermal_cooling_seq_show(struct seq_file
*seq
, void *offset
)
1408 struct acpi_thermal
*tz
= seq
->private;
1414 if (!tz
->flags
.cooling_mode
)
1415 seq_puts(seq
, "<setting not supported>\n");
1417 seq_puts(seq
, "0 - Active; 1 - Passive\n");
1423 static int acpi_thermal_cooling_open_fs(struct inode
*inode
, struct file
*file
)
1425 return single_open(file
, acpi_thermal_cooling_seq_show
,
1430 acpi_thermal_write_cooling_mode(struct file
*file
,
1431 const char __user
* buffer
,
1432 size_t count
, loff_t
* ppos
)
1434 struct seq_file
*m
= file
->private_data
;
1435 struct acpi_thermal
*tz
= m
->private;
1437 char mode_string
[12] = { '\0' };
1440 if (!tz
|| (count
> sizeof(mode_string
) - 1))
1443 if (!tz
->flags
.cooling_mode
)
1446 if (copy_from_user(mode_string
, buffer
, count
))
1449 mode_string
[count
] = '\0';
1451 result
= acpi_thermal_set_cooling_mode(tz
,
1452 simple_strtoul(mode_string
, NULL
,
1457 acpi_thermal_check(tz
);
1462 static int acpi_thermal_polling_seq_show(struct seq_file
*seq
, void *offset
)
1464 struct acpi_thermal
*tz
= seq
->private;
1470 if (!tz
->polling_frequency
) {
1471 seq_puts(seq
, "<polling disabled>\n");
1475 seq_printf(seq
, "polling frequency: %lu seconds\n",
1476 (tz
->polling_frequency
/ 10));
1482 static int acpi_thermal_polling_open_fs(struct inode
*inode
, struct file
*file
)
1484 return single_open(file
, acpi_thermal_polling_seq_show
,
1489 acpi_thermal_write_polling(struct file
*file
,
1490 const char __user
* buffer
,
1491 size_t count
, loff_t
* ppos
)
1493 struct seq_file
*m
= file
->private_data
;
1494 struct acpi_thermal
*tz
= m
->private;
1496 char polling_string
[12] = { '\0' };
1500 if (!tz
|| (count
> sizeof(polling_string
) - 1))
1503 if (copy_from_user(polling_string
, buffer
, count
))
1506 polling_string
[count
] = '\0';
1508 seconds
= simple_strtoul(polling_string
, NULL
, 0);
1510 result
= acpi_thermal_set_polling(tz
, seconds
);
1514 acpi_thermal_check(tz
);
1519 static int acpi_thermal_add_fs(struct acpi_device
*device
)
1521 struct proc_dir_entry
*entry
= NULL
;
1524 if (!acpi_device_dir(device
)) {
1525 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
1527 if (!acpi_device_dir(device
))
1529 acpi_device_dir(device
)->owner
= THIS_MODULE
;
1533 entry
= proc_create_data(ACPI_THERMAL_FILE_STATE
,
1534 S_IRUGO
, acpi_device_dir(device
),
1535 &acpi_thermal_state_fops
,
1536 acpi_driver_data(device
));
1540 /* 'temperature' [R] */
1541 entry
= proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE
,
1542 S_IRUGO
, acpi_device_dir(device
),
1543 &acpi_thermal_temp_fops
,
1544 acpi_driver_data(device
));
1548 /* 'trip_points' [R] */
1549 entry
= proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS
,
1551 acpi_device_dir(device
),
1552 &acpi_thermal_trip_fops
,
1553 acpi_driver_data(device
));
1557 /* 'cooling_mode' [R/W] */
1558 entry
= proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE
,
1559 S_IFREG
| S_IRUGO
| S_IWUSR
,
1560 acpi_device_dir(device
),
1561 &acpi_thermal_cooling_fops
,
1562 acpi_driver_data(device
));
1566 /* 'polling_frequency' [R/W] */
1567 entry
= proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ
,
1568 S_IFREG
| S_IRUGO
| S_IWUSR
,
1569 acpi_device_dir(device
),
1570 &acpi_thermal_polling_fops
,
1571 acpi_driver_data(device
));
1577 static int acpi_thermal_remove_fs(struct acpi_device
*device
)
1580 if (acpi_device_dir(device
)) {
1581 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ
,
1582 acpi_device_dir(device
));
1583 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE
,
1584 acpi_device_dir(device
));
1585 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS
,
1586 acpi_device_dir(device
));
1587 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE
,
1588 acpi_device_dir(device
));
1589 remove_proc_entry(ACPI_THERMAL_FILE_STATE
,
1590 acpi_device_dir(device
));
1591 remove_proc_entry(acpi_device_bid(device
), acpi_thermal_dir
);
1592 acpi_device_dir(device
) = NULL
;
1598 /* --------------------------------------------------------------------------
1600 -------------------------------------------------------------------------- */
1602 static void acpi_thermal_notify(acpi_handle handle
, u32 event
, void *data
)
1604 struct acpi_thermal
*tz
= data
;
1605 struct acpi_device
*device
= NULL
;
1611 device
= tz
->device
;
1614 case ACPI_THERMAL_NOTIFY_TEMPERATURE
:
1615 acpi_thermal_check(tz
);
1617 case ACPI_THERMAL_NOTIFY_THRESHOLDS
:
1618 acpi_thermal_trips_update(tz
, ACPI_TRIPS_REFRESH_THRESHOLDS
);
1619 acpi_thermal_check(tz
);
1620 acpi_bus_generate_proc_event(device
, event
, 0);
1621 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
1622 dev_name(&device
->dev
), event
, 0);
1624 case ACPI_THERMAL_NOTIFY_DEVICES
:
1625 acpi_thermal_trips_update(tz
, ACPI_TRIPS_REFRESH_DEVICES
);
1626 acpi_thermal_check(tz
);
1627 acpi_bus_generate_proc_event(device
, event
, 0);
1628 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
1629 dev_name(&device
->dev
), event
, 0);
1632 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1633 "Unsupported event [0x%x]\n", event
));
1640 static int acpi_thermal_get_info(struct acpi_thermal
*tz
)
1648 /* Get temperature [_TMP] (required) */
1649 result
= acpi_thermal_get_temperature(tz
);
1653 /* Get trip points [_CRT, _PSV, etc.] (required) */
1654 result
= acpi_thermal_get_trip_points(tz
);
1658 /* Set the cooling mode [_SCP] to active cooling (default) */
1659 result
= acpi_thermal_set_cooling_mode(tz
, ACPI_THERMAL_MODE_ACTIVE
);
1661 tz
->flags
.cooling_mode
= 1;
1663 /* Get default polling frequency [_TZP] (optional) */
1665 tz
->polling_frequency
= tzp
;
1667 acpi_thermal_get_polling_frequency(tz
);
1672 static int acpi_thermal_add(struct acpi_device
*device
)
1675 acpi_status status
= AE_OK
;
1676 struct acpi_thermal
*tz
= NULL
;
1682 tz
= kzalloc(sizeof(struct acpi_thermal
), GFP_KERNEL
);
1686 tz
->device
= device
;
1687 strcpy(tz
->name
, device
->pnp
.bus_id
);
1688 strcpy(acpi_device_name(device
), ACPI_THERMAL_DEVICE_NAME
);
1689 strcpy(acpi_device_class(device
), ACPI_THERMAL_CLASS
);
1690 device
->driver_data
= tz
;
1691 mutex_init(&tz
->lock
);
1694 result
= acpi_thermal_get_info(tz
);
1698 result
= acpi_thermal_register_thermal_zone(tz
);
1702 result
= acpi_thermal_add_fs(device
);
1704 goto unregister_thermal_zone
;
1706 init_timer(&tz
->timer
);
1708 acpi_thermal_active_off(tz
);
1710 acpi_thermal_check(tz
);
1712 status
= acpi_install_notify_handler(device
->handle
,
1714 acpi_thermal_notify
, tz
);
1715 if (ACPI_FAILURE(status
)) {
1720 printk(KERN_INFO PREFIX
"%s [%s] (%ld C)\n",
1721 acpi_device_name(device
), acpi_device_bid(device
),
1722 KELVIN_TO_CELSIUS(tz
->temperature
));
1726 acpi_thermal_remove_fs(device
);
1727 unregister_thermal_zone
:
1728 thermal_zone_device_unregister(tz
->thermal_zone
);
1735 static int acpi_thermal_remove(struct acpi_device
*device
, int type
)
1737 acpi_status status
= AE_OK
;
1738 struct acpi_thermal
*tz
= NULL
;
1741 if (!device
|| !acpi_driver_data(device
))
1744 tz
= acpi_driver_data(device
);
1746 /* avoid timer adding new defer task */
1748 /* wait for running timer (on other CPUs) finish */
1749 del_timer_sync(&(tz
->timer
));
1750 /* synchronize deferred task */
1751 acpi_os_wait_events_complete(NULL
);
1752 /* deferred task may reinsert timer */
1753 del_timer_sync(&(tz
->timer
));
1755 status
= acpi_remove_notify_handler(device
->handle
,
1757 acpi_thermal_notify
);
1759 /* Terminate policy */
1760 if (tz
->trips
.passive
.flags
.valid
&& tz
->trips
.passive
.flags
.enabled
) {
1761 tz
->trips
.passive
.flags
.enabled
= 0;
1762 acpi_thermal_passive(tz
);
1764 if (tz
->trips
.active
[0].flags
.valid
1765 && tz
->trips
.active
[0].flags
.enabled
) {
1766 tz
->trips
.active
[0].flags
.enabled
= 0;
1767 acpi_thermal_active(tz
);
1770 acpi_thermal_remove_fs(device
);
1771 acpi_thermal_unregister_thermal_zone(tz
);
1772 mutex_destroy(&tz
->lock
);
1777 static int acpi_thermal_resume(struct acpi_device
*device
)
1779 struct acpi_thermal
*tz
= NULL
;
1780 int i
, j
, power_state
, result
;
1783 if (!device
|| !acpi_driver_data(device
))
1786 tz
= acpi_driver_data(device
);
1788 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
1789 if (!(&tz
->trips
.active
[i
]))
1791 if (!tz
->trips
.active
[i
].flags
.valid
)
1793 tz
->trips
.active
[i
].flags
.enabled
= 1;
1794 for (j
= 0; j
< tz
->trips
.active
[i
].devices
.count
; j
++) {
1795 result
= acpi_bus_get_power(tz
->trips
.active
[i
].devices
.
1796 handles
[j
], &power_state
);
1797 if (result
|| (power_state
!= ACPI_STATE_D0
)) {
1798 tz
->trips
.active
[i
].flags
.enabled
= 0;
1802 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
1805 acpi_thermal_check(tz
);
1810 static int thermal_act(const struct dmi_system_id
*d
) {
1813 printk(KERN_NOTICE
"ACPI: %s detected: "
1814 "disabling all active thermal trip points\n", d
->ident
);
1819 static int thermal_nocrt(const struct dmi_system_id
*d
) {
1821 printk(KERN_NOTICE
"ACPI: %s detected: "
1822 "disabling all critical thermal trip point actions.\n", d
->ident
);
1826 static int thermal_tzp(const struct dmi_system_id
*d
) {
1829 printk(KERN_NOTICE
"ACPI: %s detected: "
1830 "enabling thermal zone polling\n", d
->ident
);
1831 tzp
= 300; /* 300 dS = 30 Seconds */
1835 static int thermal_psv(const struct dmi_system_id
*d
) {
1838 printk(KERN_NOTICE
"ACPI: %s detected: "
1839 "disabling all passive thermal trip points\n", d
->ident
);
1845 static struct dmi_system_id thermal_dmi_table
[] __initdata
= {
1847 * Award BIOS on this AOpen makes thermal control almost worthless.
1848 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1851 .callback
= thermal_act
,
1852 .ident
= "AOpen i915GMm-HFS",
1854 DMI_MATCH(DMI_BOARD_VENDOR
, "AOpen"),
1855 DMI_MATCH(DMI_BOARD_NAME
, "i915GMm-HFS"),
1859 .callback
= thermal_psv
,
1860 .ident
= "AOpen i915GMm-HFS",
1862 DMI_MATCH(DMI_BOARD_VENDOR
, "AOpen"),
1863 DMI_MATCH(DMI_BOARD_NAME
, "i915GMm-HFS"),
1867 .callback
= thermal_tzp
,
1868 .ident
= "AOpen i915GMm-HFS",
1870 DMI_MATCH(DMI_BOARD_VENDOR
, "AOpen"),
1871 DMI_MATCH(DMI_BOARD_NAME
, "i915GMm-HFS"),
1875 .callback
= thermal_nocrt
,
1876 .ident
= "Gigabyte GA-7ZX",
1878 DMI_MATCH(DMI_BOARD_VENDOR
, "Gigabyte Technology Co., Ltd."),
1879 DMI_MATCH(DMI_BOARD_NAME
, "7ZX"),
1885 static int __init
acpi_thermal_init(void)
1889 dmi_check_system(thermal_dmi_table
);
1892 printk(KERN_NOTICE
"ACPI: thermal control disabled\n");
1895 acpi_thermal_dir
= proc_mkdir(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1896 if (!acpi_thermal_dir
)
1898 acpi_thermal_dir
->owner
= THIS_MODULE
;
1900 result
= acpi_bus_register_driver(&acpi_thermal_driver
);
1902 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1909 static void __exit
acpi_thermal_exit(void)
1912 acpi_bus_unregister_driver(&acpi_thermal_driver
);
1914 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1919 module_init(acpi_thermal_init
);
1920 module_exit(acpi_thermal_exit
);