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_COMPONENT 0x04000000
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 int acpi_thermal_resume(struct acpi_device
*device
);
102 static int acpi_thermal_state_open_fs(struct inode
*inode
, struct file
*file
);
103 static int acpi_thermal_temp_open_fs(struct inode
*inode
, struct file
*file
);
104 static int acpi_thermal_trip_open_fs(struct inode
*inode
, struct file
*file
);
105 static int acpi_thermal_cooling_open_fs(struct inode
*inode
, struct file
*file
);
106 static ssize_t
acpi_thermal_write_cooling_mode(struct file
*,
107 const char __user
*, size_t,
109 static int acpi_thermal_polling_open_fs(struct inode
*inode
, struct file
*file
);
110 static ssize_t
acpi_thermal_write_polling(struct file
*, const char __user
*,
113 static const struct acpi_device_id thermal_device_ids
[] = {
114 {ACPI_THERMAL_HID
, 0},
117 MODULE_DEVICE_TABLE(acpi
, thermal_device_ids
);
119 static struct acpi_driver acpi_thermal_driver
= {
121 .class = ACPI_THERMAL_CLASS
,
122 .ids
= thermal_device_ids
,
124 .add
= acpi_thermal_add
,
125 .remove
= acpi_thermal_remove
,
126 .resume
= acpi_thermal_resume
,
130 struct acpi_thermal_state
{
139 struct acpi_thermal_state_flags
{
145 struct acpi_thermal_critical
{
146 struct acpi_thermal_state_flags flags
;
147 unsigned long temperature
;
150 struct acpi_thermal_hot
{
151 struct acpi_thermal_state_flags flags
;
152 unsigned long temperature
;
155 struct acpi_thermal_passive
{
156 struct acpi_thermal_state_flags flags
;
157 unsigned long temperature
;
161 struct acpi_handle_list devices
;
164 struct acpi_thermal_active
{
165 struct acpi_thermal_state_flags flags
;
166 unsigned long temperature
;
167 struct acpi_handle_list devices
;
170 struct acpi_thermal_trips
{
171 struct acpi_thermal_critical critical
;
172 struct acpi_thermal_hot hot
;
173 struct acpi_thermal_passive passive
;
174 struct acpi_thermal_active active
[ACPI_THERMAL_MAX_ACTIVE
];
177 struct acpi_thermal_flags
{
178 u8 cooling_mode
:1; /* _SCP */
179 u8 devices
:1; /* _TZD */
183 struct acpi_thermal
{
184 struct acpi_device
* device
;
186 unsigned long temperature
;
187 unsigned long last_temperature
;
188 unsigned long polling_frequency
;
190 struct acpi_thermal_flags flags
;
191 struct acpi_thermal_state state
;
192 struct acpi_thermal_trips trips
;
193 struct acpi_handle_list devices
;
194 struct timer_list timer
;
195 struct thermal_zone_device
*thermal_zone
;
200 static const struct file_operations acpi_thermal_state_fops
= {
201 .owner
= THIS_MODULE
,
202 .open
= acpi_thermal_state_open_fs
,
205 .release
= single_release
,
208 static const struct file_operations acpi_thermal_temp_fops
= {
209 .owner
= THIS_MODULE
,
210 .open
= acpi_thermal_temp_open_fs
,
213 .release
= single_release
,
216 static const struct file_operations acpi_thermal_trip_fops
= {
217 .owner
= THIS_MODULE
,
218 .open
= acpi_thermal_trip_open_fs
,
221 .release
= single_release
,
224 static const struct file_operations acpi_thermal_cooling_fops
= {
225 .owner
= THIS_MODULE
,
226 .open
= acpi_thermal_cooling_open_fs
,
228 .write
= acpi_thermal_write_cooling_mode
,
230 .release
= single_release
,
233 static const struct file_operations acpi_thermal_polling_fops
= {
234 .owner
= THIS_MODULE
,
235 .open
= acpi_thermal_polling_open_fs
,
237 .write
= acpi_thermal_write_polling
,
239 .release
= single_release
,
242 /* --------------------------------------------------------------------------
243 Thermal Zone Management
244 -------------------------------------------------------------------------- */
246 static int acpi_thermal_get_temperature(struct acpi_thermal
*tz
)
248 acpi_status status
= AE_OK
;
254 tz
->last_temperature
= tz
->temperature
;
257 acpi_evaluate_integer(tz
->device
->handle
, "_TMP", NULL
, &tz
->temperature
);
258 if (ACPI_FAILURE(status
))
261 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Temperature is %lu dK\n",
267 static int acpi_thermal_get_polling_frequency(struct acpi_thermal
*tz
)
269 acpi_status status
= AE_OK
;
276 acpi_evaluate_integer(tz
->device
->handle
, "_TZP", NULL
,
277 &tz
->polling_frequency
);
278 if (ACPI_FAILURE(status
))
281 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Polling frequency is %lu dS\n",
282 tz
->polling_frequency
));
287 static int acpi_thermal_set_polling(struct acpi_thermal
*tz
, int seconds
)
293 tz
->polling_frequency
= seconds
* 10; /* Convert value to deci-seconds */
295 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
296 "Polling frequency set to %lu seconds\n",
297 tz
->polling_frequency
/10));
302 static int acpi_thermal_set_cooling_mode(struct acpi_thermal
*tz
, int mode
)
304 acpi_status status
= AE_OK
;
305 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
306 struct acpi_object_list arg_list
= { 1, &arg0
};
307 acpi_handle handle
= NULL
;
313 status
= acpi_get_handle(tz
->device
->handle
, "_SCP", &handle
);
314 if (ACPI_FAILURE(status
)) {
315 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "_SCP not present\n"));
319 arg0
.integer
.value
= mode
;
321 status
= acpi_evaluate_object(handle
, NULL
, &arg_list
, NULL
);
322 if (ACPI_FAILURE(status
))
328 #define ACPI_TRIPS_CRITICAL 0x01
329 #define ACPI_TRIPS_HOT 0x02
330 #define ACPI_TRIPS_PASSIVE 0x04
331 #define ACPI_TRIPS_ACTIVE 0x08
332 #define ACPI_TRIPS_DEVICES 0x10
334 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
335 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
337 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
338 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
342 * This exception is thrown out in two cases:
343 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
344 * when re-evaluating the AML code.
345 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
346 * We need to re-bind the cooling devices of a thermal zone when this occurs.
348 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
350 if (flags != ACPI_TRIPS_INIT) \
351 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
352 "ACPI thermal trip point %s changed\n" \
353 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
356 static int acpi_thermal_trips_update(struct acpi_thermal
*tz
, int flag
)
358 acpi_status status
= AE_OK
;
359 struct acpi_handle_list devices
;
363 /* Critical Shutdown (required) */
364 if (flag
& ACPI_TRIPS_CRITICAL
) {
365 status
= acpi_evaluate_integer(tz
->device
->handle
,
366 "_CRT", NULL
, &tz
->trips
.critical
.temperature
);
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
,
404 "_HOT", NULL
, &tz
->trips
.hot
.temperature
);
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
.flags
.valid
= 1;
411 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
412 "Found hot threshold [%lu]\n",
413 tz
->trips
.critical
.temperature
));
417 /* Passive (optional) */
418 if (flag
& ACPI_TRIPS_PASSIVE
) {
419 valid
= tz
->trips
.passive
.flags
.valid
;
422 } else if (psv
> 0) {
423 tz
->trips
.passive
.temperature
= CELSIUS_TO_KELVIN(psv
);
426 status
= acpi_evaluate_integer(tz
->device
->handle
,
427 "_PSV", NULL
, &tz
->trips
.passive
.temperature
);
430 if (ACPI_FAILURE(status
))
431 tz
->trips
.passive
.flags
.valid
= 0;
433 tz
->trips
.passive
.flags
.valid
= 1;
434 if (flag
== ACPI_TRIPS_INIT
) {
435 status
= acpi_evaluate_integer(
436 tz
->device
->handle
, "_TC1",
437 NULL
, &tz
->trips
.passive
.tc1
);
438 if (ACPI_FAILURE(status
))
439 tz
->trips
.passive
.flags
.valid
= 0;
440 status
= acpi_evaluate_integer(
441 tz
->device
->handle
, "_TC2",
442 NULL
, &tz
->trips
.passive
.tc2
);
443 if (ACPI_FAILURE(status
))
444 tz
->trips
.passive
.flags
.valid
= 0;
445 status
= acpi_evaluate_integer(
446 tz
->device
->handle
, "_TSP",
447 NULL
, &tz
->trips
.passive
.tsp
);
448 if (ACPI_FAILURE(status
))
449 tz
->trips
.passive
.flags
.valid
= 0;
453 if ((flag
& ACPI_TRIPS_DEVICES
) && tz
->trips
.passive
.flags
.valid
) {
454 memset(&devices
, 0, sizeof(struct acpi_handle_list
));
455 status
= acpi_evaluate_reference(tz
->device
->handle
, "_PSL",
457 if (ACPI_FAILURE(status
))
458 tz
->trips
.passive
.flags
.valid
= 0;
460 tz
->trips
.passive
.flags
.valid
= 1;
462 if (memcmp(&tz
->trips
.passive
.devices
, &devices
,
463 sizeof(struct acpi_handle_list
))) {
464 memcpy(&tz
->trips
.passive
.devices
, &devices
,
465 sizeof(struct acpi_handle_list
));
466 ACPI_THERMAL_TRIPS_EXCEPTION(flag
, "device");
469 if ((flag
& ACPI_TRIPS_PASSIVE
) || (flag
& ACPI_TRIPS_DEVICES
)) {
470 if (valid
!= tz
->trips
.passive
.flags
.valid
)
471 ACPI_THERMAL_TRIPS_EXCEPTION(flag
, "state");
474 /* Active (optional) */
475 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
476 char name
[5] = { '_', 'A', 'C', ('0' + i
), '\0' };
477 valid
= tz
->trips
.active
[i
].flags
.valid
;
480 break; /* disable all active trip points */
482 if (flag
& ACPI_TRIPS_ACTIVE
) {
483 status
= acpi_evaluate_integer(tz
->device
->handle
,
484 name
, NULL
, &tz
->trips
.active
[i
].temperature
);
485 if (ACPI_FAILURE(status
)) {
486 tz
->trips
.active
[i
].flags
.valid
= 0;
492 tz
->trips
.active
[0].temperature
=
493 CELSIUS_TO_KELVIN(act
);
496 * Don't allow override higher than
497 * the next higher trip point
499 tz
->trips
.active
[i
- 1].temperature
=
500 (tz
->trips
.active
[i
- 2].temperature
<
501 CELSIUS_TO_KELVIN(act
) ?
502 tz
->trips
.active
[i
- 2].temperature
:
503 CELSIUS_TO_KELVIN(act
));
506 tz
->trips
.active
[i
].flags
.valid
= 1;
510 if ((flag
& ACPI_TRIPS_DEVICES
) && tz
->trips
.active
[i
].flags
.valid
) {
511 memset(&devices
, 0, sizeof(struct acpi_handle_list
));
512 status
= acpi_evaluate_reference(tz
->device
->handle
,
513 name
, NULL
, &devices
);
514 if (ACPI_FAILURE(status
))
515 tz
->trips
.active
[i
].flags
.valid
= 0;
517 tz
->trips
.active
[i
].flags
.valid
= 1;
519 if (memcmp(&tz
->trips
.active
[i
].devices
, &devices
,
520 sizeof(struct acpi_handle_list
))) {
521 memcpy(&tz
->trips
.active
[i
].devices
, &devices
,
522 sizeof(struct acpi_handle_list
));
523 ACPI_THERMAL_TRIPS_EXCEPTION(flag
, "device");
526 if ((flag
& ACPI_TRIPS_ACTIVE
) || (flag
& ACPI_TRIPS_DEVICES
))
527 if (valid
!= tz
->trips
.active
[i
].flags
.valid
)
528 ACPI_THERMAL_TRIPS_EXCEPTION(flag
, "state");
530 if (!tz
->trips
.active
[i
].flags
.valid
)
534 if (flag
& ACPI_TRIPS_DEVICES
) {
535 memset(&devices
, 0, sizeof(struct acpi_handle_list
));
536 status
= acpi_evaluate_reference(tz
->device
->handle
, "_TZD",
538 if (memcmp(&tz
->devices
, &devices
,
539 sizeof(struct acpi_handle_list
))) {
540 memcpy(&tz
->devices
, &devices
,
541 sizeof(struct acpi_handle_list
));
542 ACPI_THERMAL_TRIPS_EXCEPTION(flag
, "device");
549 static int acpi_thermal_get_trip_points(struct acpi_thermal
*tz
)
551 return acpi_thermal_trips_update(tz
, ACPI_TRIPS_INIT
);
554 static int acpi_thermal_critical(struct acpi_thermal
*tz
)
556 if (!tz
|| !tz
->trips
.critical
.flags
.valid
)
559 if (tz
->temperature
>= tz
->trips
.critical
.temperature
) {
560 printk(KERN_WARNING PREFIX
"Critical trip point\n");
561 tz
->trips
.critical
.flags
.enabled
= 1;
562 } else if (tz
->trips
.critical
.flags
.enabled
)
563 tz
->trips
.critical
.flags
.enabled
= 0;
565 acpi_bus_generate_proc_event(tz
->device
, ACPI_THERMAL_NOTIFY_CRITICAL
,
566 tz
->trips
.critical
.flags
.enabled
);
567 acpi_bus_generate_netlink_event(tz
->device
->pnp
.device_class
,
568 tz
->device
->dev
.bus_id
,
569 ACPI_THERMAL_NOTIFY_CRITICAL
,
570 tz
->trips
.critical
.flags
.enabled
);
572 /* take no action if nocrt is set */
575 "Critical temperature reached (%ld C), shutting down.\n",
576 KELVIN_TO_CELSIUS(tz
->temperature
));
577 orderly_poweroff(true);
583 static int acpi_thermal_hot(struct acpi_thermal
*tz
)
585 if (!tz
|| !tz
->trips
.hot
.flags
.valid
)
588 if (tz
->temperature
>= tz
->trips
.hot
.temperature
) {
589 printk(KERN_WARNING PREFIX
"Hot trip point\n");
590 tz
->trips
.hot
.flags
.enabled
= 1;
591 } else if (tz
->trips
.hot
.flags
.enabled
)
592 tz
->trips
.hot
.flags
.enabled
= 0;
594 acpi_bus_generate_proc_event(tz
->device
, ACPI_THERMAL_NOTIFY_HOT
,
595 tz
->trips
.hot
.flags
.enabled
);
596 acpi_bus_generate_netlink_event(tz
->device
->pnp
.device_class
,
597 tz
->device
->dev
.bus_id
,
598 ACPI_THERMAL_NOTIFY_HOT
,
599 tz
->trips
.hot
.flags
.enabled
);
601 /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
606 static void acpi_thermal_passive(struct acpi_thermal
*tz
)
609 struct acpi_thermal_passive
*passive
= NULL
;
614 if (!tz
|| !tz
->trips
.passive
.flags
.valid
)
617 passive
= &(tz
->trips
.passive
);
622 * Calculate the thermal trend (using the passive cooling equation)
623 * and modify the performance limit for all passive cooling devices
624 * accordingly. Note that we assume symmetry.
626 if (tz
->temperature
>= passive
->temperature
) {
628 (passive
->tc1
* (tz
->temperature
- tz
->last_temperature
)) +
629 (passive
->tc2
* (tz
->temperature
- passive
->temperature
));
630 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
631 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
632 trend
, passive
->tc1
, tz
->temperature
,
633 tz
->last_temperature
, passive
->tc2
,
634 tz
->temperature
, passive
->temperature
));
635 passive
->flags
.enabled
= 1;
638 for (i
= 0; i
< passive
->devices
.count
; i
++)
639 acpi_processor_set_thermal_limit(passive
->
642 ACPI_PROCESSOR_LIMIT_INCREMENT
);
644 else if (trend
< 0) {
645 for (i
= 0; i
< passive
->devices
.count
; i
++)
647 * assume that we are on highest
648 * freq/lowest thrott and can leave
649 * passive mode, even in error case
651 if (!acpi_processor_set_thermal_limit
652 (passive
->devices
.handles
[i
],
653 ACPI_PROCESSOR_LIMIT_DECREMENT
))
656 * Leave cooling mode, even if the temp might
657 * higher than trip point This is because some
658 * machines might have long thermal polling
659 * frequencies (tsp) defined. We will fall back
660 * into passive mode in next cycle (probably quicker)
663 passive
->flags
.enabled
= 0;
664 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
665 "Disabling passive cooling, still above threshold,"
666 " but we are cooling down\n"));
675 * Implement passive cooling hysteresis to slowly increase performance
676 * and avoid thrashing around the passive trip point. Note that we
679 if (!passive
->flags
.enabled
)
681 for (i
= 0; i
< passive
->devices
.count
; i
++)
682 if (!acpi_processor_set_thermal_limit
683 (passive
->devices
.handles
[i
],
684 ACPI_PROCESSOR_LIMIT_DECREMENT
))
687 passive
->flags
.enabled
= 0;
688 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
689 "Disabling passive cooling (zone is cool)\n"));
693 static void acpi_thermal_active(struct acpi_thermal
*tz
)
696 struct acpi_thermal_active
*active
= NULL
;
699 unsigned long maxtemp
= 0;
705 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
706 active
= &(tz
->trips
.active
[i
]);
707 if (!active
|| !active
->flags
.valid
)
709 if (tz
->temperature
>= active
->temperature
) {
713 * If not already enabled, turn ON all cooling devices
714 * associated with this active threshold.
716 if (active
->temperature
> maxtemp
)
717 tz
->state
.active_index
= i
;
718 maxtemp
= active
->temperature
;
719 if (active
->flags
.enabled
)
721 for (j
= 0; j
< active
->devices
.count
; j
++) {
723 acpi_bus_set_power(active
->devices
.
727 printk(KERN_WARNING PREFIX
728 "Unable to turn cooling device [%p] 'on'\n",
733 active
->flags
.enabled
= 1;
734 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
735 "Cooling device [%p] now 'on'\n",
736 active
->devices
.handles
[j
]));
740 if (!active
->flags
.enabled
)
745 * Turn OFF all cooling devices associated with this
748 for (j
= 0; j
< active
->devices
.count
; j
++) {
749 result
= acpi_bus_set_power(active
->devices
.handles
[j
],
752 printk(KERN_WARNING PREFIX
753 "Unable to turn cooling device [%p] 'off'\n",
754 active
->devices
.handles
[j
]);
757 active
->flags
.enabled
= 0;
758 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
759 "Cooling device [%p] now 'off'\n",
760 active
->devices
.handles
[j
]));
765 static void acpi_thermal_check(void *context
);
767 static void acpi_thermal_run(unsigned long data
)
769 struct acpi_thermal
*tz
= (struct acpi_thermal
*)data
;
771 acpi_os_execute(OSL_GPE_HANDLER
, acpi_thermal_check
, (void *)data
);
774 static void acpi_thermal_active_off(void *data
)
777 struct acpi_thermal
*tz
= data
;
780 struct acpi_thermal_active
*active
= NULL
;
783 printk(KERN_ERR PREFIX
"Invalid (NULL) context\n");
787 result
= acpi_thermal_get_temperature(tz
);
791 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
792 active
= &(tz
->trips
.active
[i
]);
793 if (!active
|| !active
->flags
.valid
)
795 if (tz
->temperature
>= active
->temperature
) {
797 * If the thermal temperature is greater than the
798 * active threshod, unnecessary to turn off the
799 * the active cooling device.
806 * Turn OFF all cooling devices associated with this
809 for (j
= 0; j
< active
->devices
.count
; j
++)
810 result
= acpi_bus_set_power(active
->devices
.handles
[j
],
815 static void acpi_thermal_check(void *data
)
818 struct acpi_thermal
*tz
= data
;
819 unsigned long sleep_time
= 0;
820 unsigned long timeout_jiffies
= 0;
822 struct acpi_thermal_state state
;
826 printk(KERN_ERR PREFIX
"Invalid (NULL) context\n");
830 /* Check if someone else is already running */
831 if (!mutex_trylock(&tz
->lock
))
836 result
= acpi_thermal_get_temperature(tz
);
843 memset(&tz
->state
, 0, sizeof(tz
->state
));
848 * Compare the current temperature to the trip point values to see
849 * if we've entered one of the thermal policy states. Note that
850 * this function determines when a state is entered, but the
851 * individual policy decides when it is exited (e.g. hysteresis).
853 if (tz
->trips
.critical
.flags
.valid
)
855 (tz
->temperature
>= tz
->trips
.critical
.temperature
);
856 if (tz
->trips
.hot
.flags
.valid
)
857 state
.hot
|= (tz
->temperature
>= tz
->trips
.hot
.temperature
);
858 if (tz
->trips
.passive
.flags
.valid
)
860 (tz
->temperature
>= tz
->trips
.passive
.temperature
);
861 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
862 if (tz
->trips
.active
[i
].flags
.valid
)
865 tz
->trips
.active
[i
].temperature
);
870 * Separated from the above check to allow individual policy to
871 * determine when to exit a given state.
874 acpi_thermal_critical(tz
);
876 acpi_thermal_hot(tz
);
878 acpi_thermal_passive(tz
);
880 acpi_thermal_active(tz
);
885 * Again, separated from the above two to allow independent policy
888 tz
->state
.critical
= tz
->trips
.critical
.flags
.enabled
;
889 tz
->state
.hot
= tz
->trips
.hot
.flags
.enabled
;
890 tz
->state
.passive
= tz
->trips
.passive
.flags
.enabled
;
891 tz
->state
.active
= 0;
892 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
893 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
896 * Calculate Sleep Time
897 * --------------------
898 * If we're in the passive state, use _TSP's value. Otherwise
899 * use the default polling frequency (e.g. _TZP). If no polling
900 * frequency is specified then we'll wait forever (at least until
901 * a thermal event occurs). Note that _TSP and _TZD values are
902 * given in 1/10th seconds (we must covert to milliseconds).
904 if (tz
->state
.passive
) {
905 sleep_time
= tz
->trips
.passive
.tsp
* 100;
906 timeout_jiffies
= jiffies
+ (HZ
* sleep_time
) / 1000;
907 } else if (tz
->polling_frequency
> 0) {
908 sleep_time
= tz
->polling_frequency
* 100;
909 timeout_jiffies
= round_jiffies(jiffies
+ (HZ
* sleep_time
) / 1000);
912 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "%s: temperature[%lu] sleep[%lu]\n",
913 tz
->name
, tz
->temperature
, sleep_time
));
920 if (timer_pending(&(tz
->timer
)))
921 del_timer(&(tz
->timer
));
923 if (timer_pending(&(tz
->timer
)))
924 mod_timer(&(tz
->timer
), timeout_jiffies
);
926 tz
->timer
.data
= (unsigned long)tz
;
927 tz
->timer
.function
= acpi_thermal_run
;
928 tz
->timer
.expires
= timeout_jiffies
;
929 add_timer(&(tz
->timer
));
933 mutex_unlock(&tz
->lock
);
936 /* sys I/F for generic thermal sysfs support */
937 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
939 static int thermal_get_temp(struct thermal_zone_device
*thermal
, char *buf
)
941 struct acpi_thermal
*tz
= thermal
->devdata
;
947 result
= acpi_thermal_get_temperature(tz
);
951 return sprintf(buf
, "%ld\n", KELVIN_TO_MILLICELSIUS(tz
->temperature
));
954 static const char enabled
[] = "kernel";
955 static const char disabled
[] = "user";
956 static int thermal_get_mode(struct thermal_zone_device
*thermal
,
959 struct acpi_thermal
*tz
= thermal
->devdata
;
964 return sprintf(buf
, "%s\n", tz
->tz_enabled
?
968 static int thermal_set_mode(struct thermal_zone_device
*thermal
,
971 struct acpi_thermal
*tz
= thermal
->devdata
;
978 * enable/disable thermal management from ACPI thermal driver
980 if (!strncmp(buf
, enabled
, sizeof enabled
- 1))
982 else if (!strncmp(buf
, disabled
, sizeof disabled
- 1))
987 if (enable
!= tz
->tz_enabled
) {
988 tz
->tz_enabled
= enable
;
989 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
990 "%s ACPI thermal control\n",
991 tz
->tz_enabled
? enabled
: disabled
));
992 acpi_thermal_check(tz
);
997 static int thermal_get_trip_type(struct thermal_zone_device
*thermal
,
1000 struct acpi_thermal
*tz
= thermal
->devdata
;
1003 if (!tz
|| trip
< 0)
1006 if (tz
->trips
.critical
.flags
.valid
) {
1008 return sprintf(buf
, "critical\n");
1012 if (tz
->trips
.hot
.flags
.valid
) {
1014 return sprintf(buf
, "hot\n");
1018 if (tz
->trips
.passive
.flags
.valid
) {
1020 return sprintf(buf
, "passive\n");
1024 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
&&
1025 tz
->trips
.active
[i
].flags
.valid
; i
++) {
1027 return sprintf(buf
, "active%d\n", i
);
1034 static int thermal_get_trip_temp(struct thermal_zone_device
*thermal
,
1035 int trip
, char *buf
)
1037 struct acpi_thermal
*tz
= thermal
->devdata
;
1040 if (!tz
|| trip
< 0)
1043 if (tz
->trips
.critical
.flags
.valid
) {
1045 return sprintf(buf
, "%ld\n", KELVIN_TO_MILLICELSIUS(
1046 tz
->trips
.critical
.temperature
));
1050 if (tz
->trips
.hot
.flags
.valid
) {
1052 return sprintf(buf
, "%ld\n", KELVIN_TO_MILLICELSIUS(
1053 tz
->trips
.hot
.temperature
));
1057 if (tz
->trips
.passive
.flags
.valid
) {
1059 return sprintf(buf
, "%ld\n", KELVIN_TO_MILLICELSIUS(
1060 tz
->trips
.passive
.temperature
));
1064 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
&&
1065 tz
->trips
.active
[i
].flags
.valid
; i
++) {
1067 return sprintf(buf
, "%ld\n", KELVIN_TO_MILLICELSIUS(
1068 tz
->trips
.active
[i
].temperature
));
1075 static int thermal_get_crit_temp(struct thermal_zone_device
*thermal
,
1076 unsigned long *temperature
) {
1077 struct acpi_thermal
*tz
= thermal
->devdata
;
1079 if (tz
->trips
.critical
.flags
.valid
) {
1080 *temperature
= KELVIN_TO_MILLICELSIUS(
1081 tz
->trips
.critical
.temperature
);
1087 typedef int (*cb
)(struct thermal_zone_device
*, int,
1088 struct thermal_cooling_device
*);
1089 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device
*thermal
,
1090 struct thermal_cooling_device
*cdev
,
1093 struct acpi_device
*device
= cdev
->devdata
;
1094 struct acpi_thermal
*tz
= thermal
->devdata
;
1095 struct acpi_device
*dev
;
1103 if (tz
->trips
.critical
.flags
.valid
)
1106 if (tz
->trips
.hot
.flags
.valid
)
1109 if (tz
->trips
.passive
.flags
.valid
) {
1111 for (i
= 0; i
< tz
->trips
.passive
.devices
.count
;
1113 handle
= tz
->trips
.passive
.devices
.handles
[i
];
1114 status
= acpi_bus_get_device(handle
, &dev
);
1115 if (ACPI_SUCCESS(status
) && (dev
== device
)) {
1116 result
= action(thermal
, trip
, cdev
);
1123 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
1124 if (!tz
->trips
.active
[i
].flags
.valid
)
1128 j
< tz
->trips
.active
[i
].devices
.count
;
1130 handle
= tz
->trips
.active
[i
].devices
.handles
[j
];
1131 status
= acpi_bus_get_device(handle
, &dev
);
1132 if (ACPI_SUCCESS(status
) && (dev
== device
)) {
1133 result
= action(thermal
, trip
, cdev
);
1140 for (i
= 0; i
< tz
->devices
.count
; i
++) {
1141 handle
= tz
->devices
.handles
[i
];
1142 status
= acpi_bus_get_device(handle
, &dev
);
1143 if (ACPI_SUCCESS(status
) && (dev
== device
)) {
1144 result
= action(thermal
, -1, cdev
);
1155 acpi_thermal_bind_cooling_device(struct thermal_zone_device
*thermal
,
1156 struct thermal_cooling_device
*cdev
)
1158 return acpi_thermal_cooling_device_cb(thermal
, cdev
,
1159 thermal_zone_bind_cooling_device
);
1163 acpi_thermal_unbind_cooling_device(struct thermal_zone_device
*thermal
,
1164 struct thermal_cooling_device
*cdev
)
1166 return acpi_thermal_cooling_device_cb(thermal
, cdev
,
1167 thermal_zone_unbind_cooling_device
);
1170 static struct thermal_zone_device_ops acpi_thermal_zone_ops
= {
1171 .bind
= acpi_thermal_bind_cooling_device
,
1172 .unbind
= acpi_thermal_unbind_cooling_device
,
1173 .get_temp
= thermal_get_temp
,
1174 .get_mode
= thermal_get_mode
,
1175 .set_mode
= thermal_set_mode
,
1176 .get_trip_type
= thermal_get_trip_type
,
1177 .get_trip_temp
= thermal_get_trip_temp
,
1178 .get_crit_temp
= thermal_get_crit_temp
,
1181 static int acpi_thermal_register_thermal_zone(struct acpi_thermal
*tz
)
1188 if (tz
->trips
.critical
.flags
.valid
)
1191 if (tz
->trips
.hot
.flags
.valid
)
1194 if (tz
->trips
.passive
.flags
.valid
)
1197 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
&&
1198 tz
->trips
.active
[i
].flags
.valid
; i
++, trips
++);
1199 tz
->thermal_zone
= thermal_zone_device_register("acpitz",
1200 trips
, tz
, &acpi_thermal_zone_ops
);
1201 if (IS_ERR(tz
->thermal_zone
))
1204 result
= sysfs_create_link(&tz
->device
->dev
.kobj
,
1205 &tz
->thermal_zone
->device
.kobj
, "thermal_zone");
1209 result
= sysfs_create_link(&tz
->thermal_zone
->device
.kobj
,
1210 &tz
->device
->dev
.kobj
, "device");
1214 status
= acpi_attach_data(tz
->device
->handle
,
1215 acpi_bus_private_data_handler
,
1217 if (ACPI_FAILURE(status
)) {
1218 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
1219 "Error attaching device data\n"));
1225 dev_info(&tz
->device
->dev
, "registered as thermal_zone%d\n",
1226 tz
->thermal_zone
->id
);
1230 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal
*tz
)
1232 sysfs_remove_link(&tz
->device
->dev
.kobj
, "thermal_zone");
1233 sysfs_remove_link(&tz
->thermal_zone
->device
.kobj
, "device");
1234 thermal_zone_device_unregister(tz
->thermal_zone
);
1235 tz
->thermal_zone
= NULL
;
1236 acpi_detach_data(tz
->device
->handle
, acpi_bus_private_data_handler
);
1240 /* --------------------------------------------------------------------------
1241 FS Interface (/proc)
1242 -------------------------------------------------------------------------- */
1244 static struct proc_dir_entry
*acpi_thermal_dir
;
1246 static int acpi_thermal_state_seq_show(struct seq_file
*seq
, void *offset
)
1248 struct acpi_thermal
*tz
= seq
->private;
1254 seq_puts(seq
, "state: ");
1256 if (!tz
->state
.critical
&& !tz
->state
.hot
&& !tz
->state
.passive
1257 && !tz
->state
.active
)
1258 seq_puts(seq
, "ok\n");
1260 if (tz
->state
.critical
)
1261 seq_puts(seq
, "critical ");
1263 seq_puts(seq
, "hot ");
1264 if (tz
->state
.passive
)
1265 seq_puts(seq
, "passive ");
1266 if (tz
->state
.active
)
1267 seq_printf(seq
, "active[%d]", tz
->state
.active_index
);
1268 seq_puts(seq
, "\n");
1275 static int acpi_thermal_state_open_fs(struct inode
*inode
, struct file
*file
)
1277 return single_open(file
, acpi_thermal_state_seq_show
, PDE(inode
)->data
);
1280 static int acpi_thermal_temp_seq_show(struct seq_file
*seq
, void *offset
)
1283 struct acpi_thermal
*tz
= seq
->private;
1289 result
= acpi_thermal_get_temperature(tz
);
1293 seq_printf(seq
, "temperature: %ld C\n",
1294 KELVIN_TO_CELSIUS(tz
->temperature
));
1300 static int acpi_thermal_temp_open_fs(struct inode
*inode
, struct file
*file
)
1302 return single_open(file
, acpi_thermal_temp_seq_show
, PDE(inode
)->data
);
1305 static int acpi_thermal_trip_seq_show(struct seq_file
*seq
, void *offset
)
1307 struct acpi_thermal
*tz
= seq
->private;
1308 struct acpi_device
*device
;
1318 if (tz
->trips
.critical
.flags
.valid
)
1319 seq_printf(seq
, "critical (S5): %ld C%s",
1320 KELVIN_TO_CELSIUS(tz
->trips
.critical
.temperature
),
1321 nocrt
? " <disabled>\n" : "\n");
1323 if (tz
->trips
.hot
.flags
.valid
)
1324 seq_printf(seq
, "hot (S4): %ld C%s",
1325 KELVIN_TO_CELSIUS(tz
->trips
.hot
.temperature
),
1326 nocrt
? " <disabled>\n" : "\n");
1328 if (tz
->trips
.passive
.flags
.valid
) {
1330 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1331 KELVIN_TO_CELSIUS(tz
->trips
.passive
.temperature
),
1332 tz
->trips
.passive
.tc1
, tz
->trips
.passive
.tc2
,
1333 tz
->trips
.passive
.tsp
);
1334 for (j
= 0; j
< tz
->trips
.passive
.devices
.count
; j
++) {
1335 status
= acpi_bus_get_device(tz
->trips
.passive
.devices
.
1336 handles
[j
], &device
);
1337 seq_printf(seq
, "%4.4s ", status
? "" :
1338 acpi_device_bid(device
));
1340 seq_puts(seq
, "\n");
1343 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
1344 if (!(tz
->trips
.active
[i
].flags
.valid
))
1346 seq_printf(seq
, "active[%d]: %ld C: devices=",
1348 KELVIN_TO_CELSIUS(tz
->trips
.active
[i
].temperature
));
1349 for (j
= 0; j
< tz
->trips
.active
[i
].devices
.count
; j
++){
1350 status
= acpi_bus_get_device(tz
->trips
.active
[i
].
1353 seq_printf(seq
, "%4.4s ", status
? "" :
1354 acpi_device_bid(device
));
1356 seq_puts(seq
, "\n");
1363 static int acpi_thermal_trip_open_fs(struct inode
*inode
, struct file
*file
)
1365 return single_open(file
, acpi_thermal_trip_seq_show
, PDE(inode
)->data
);
1368 static int acpi_thermal_cooling_seq_show(struct seq_file
*seq
, void *offset
)
1370 struct acpi_thermal
*tz
= seq
->private;
1376 if (!tz
->flags
.cooling_mode
)
1377 seq_puts(seq
, "<setting not supported>\n");
1379 seq_puts(seq
, "0 - Active; 1 - Passive\n");
1385 static int acpi_thermal_cooling_open_fs(struct inode
*inode
, struct file
*file
)
1387 return single_open(file
, acpi_thermal_cooling_seq_show
,
1392 acpi_thermal_write_cooling_mode(struct file
*file
,
1393 const char __user
* buffer
,
1394 size_t count
, loff_t
* ppos
)
1396 struct seq_file
*m
= file
->private_data
;
1397 struct acpi_thermal
*tz
= m
->private;
1399 char mode_string
[12] = { '\0' };
1402 if (!tz
|| (count
> sizeof(mode_string
) - 1))
1405 if (!tz
->flags
.cooling_mode
)
1408 if (copy_from_user(mode_string
, buffer
, count
))
1411 mode_string
[count
] = '\0';
1413 result
= acpi_thermal_set_cooling_mode(tz
,
1414 simple_strtoul(mode_string
, NULL
,
1419 acpi_thermal_check(tz
);
1424 static int acpi_thermal_polling_seq_show(struct seq_file
*seq
, void *offset
)
1426 struct acpi_thermal
*tz
= seq
->private;
1432 if (!tz
->polling_frequency
) {
1433 seq_puts(seq
, "<polling disabled>\n");
1437 seq_printf(seq
, "polling frequency: %lu seconds\n",
1438 (tz
->polling_frequency
/ 10));
1444 static int acpi_thermal_polling_open_fs(struct inode
*inode
, struct file
*file
)
1446 return single_open(file
, acpi_thermal_polling_seq_show
,
1451 acpi_thermal_write_polling(struct file
*file
,
1452 const char __user
* buffer
,
1453 size_t count
, loff_t
* ppos
)
1455 struct seq_file
*m
= file
->private_data
;
1456 struct acpi_thermal
*tz
= m
->private;
1458 char polling_string
[12] = { '\0' };
1462 if (!tz
|| (count
> sizeof(polling_string
) - 1))
1465 if (copy_from_user(polling_string
, buffer
, count
))
1468 polling_string
[count
] = '\0';
1470 seconds
= simple_strtoul(polling_string
, NULL
, 0);
1472 result
= acpi_thermal_set_polling(tz
, seconds
);
1476 acpi_thermal_check(tz
);
1481 static int acpi_thermal_add_fs(struct acpi_device
*device
)
1483 struct proc_dir_entry
*entry
= NULL
;
1486 if (!acpi_device_dir(device
)) {
1487 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
1489 if (!acpi_device_dir(device
))
1491 acpi_device_dir(device
)->owner
= THIS_MODULE
;
1495 entry
= proc_create_data(ACPI_THERMAL_FILE_STATE
,
1496 S_IRUGO
, acpi_device_dir(device
),
1497 &acpi_thermal_state_fops
,
1498 acpi_driver_data(device
));
1502 /* 'temperature' [R] */
1503 entry
= proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE
,
1504 S_IRUGO
, acpi_device_dir(device
),
1505 &acpi_thermal_temp_fops
,
1506 acpi_driver_data(device
));
1510 /* 'trip_points' [R] */
1511 entry
= proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS
,
1513 acpi_device_dir(device
),
1514 &acpi_thermal_trip_fops
,
1515 acpi_driver_data(device
));
1519 /* 'cooling_mode' [R/W] */
1520 entry
= proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE
,
1521 S_IFREG
| S_IRUGO
| S_IWUSR
,
1522 acpi_device_dir(device
),
1523 &acpi_thermal_cooling_fops
,
1524 acpi_driver_data(device
));
1528 /* 'polling_frequency' [R/W] */
1529 entry
= proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ
,
1530 S_IFREG
| S_IRUGO
| S_IWUSR
,
1531 acpi_device_dir(device
),
1532 &acpi_thermal_polling_fops
,
1533 acpi_driver_data(device
));
1539 static int acpi_thermal_remove_fs(struct acpi_device
*device
)
1542 if (acpi_device_dir(device
)) {
1543 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ
,
1544 acpi_device_dir(device
));
1545 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE
,
1546 acpi_device_dir(device
));
1547 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS
,
1548 acpi_device_dir(device
));
1549 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE
,
1550 acpi_device_dir(device
));
1551 remove_proc_entry(ACPI_THERMAL_FILE_STATE
,
1552 acpi_device_dir(device
));
1553 remove_proc_entry(acpi_device_bid(device
), acpi_thermal_dir
);
1554 acpi_device_dir(device
) = NULL
;
1560 /* --------------------------------------------------------------------------
1562 -------------------------------------------------------------------------- */
1564 static void acpi_thermal_notify(acpi_handle handle
, u32 event
, void *data
)
1566 struct acpi_thermal
*tz
= data
;
1567 struct acpi_device
*device
= NULL
;
1573 device
= tz
->device
;
1576 case ACPI_THERMAL_NOTIFY_TEMPERATURE
:
1577 acpi_thermal_check(tz
);
1579 case ACPI_THERMAL_NOTIFY_THRESHOLDS
:
1580 acpi_thermal_trips_update(tz
, ACPI_TRIPS_REFRESH_THRESHOLDS
);
1581 acpi_thermal_check(tz
);
1582 acpi_bus_generate_proc_event(device
, event
, 0);
1583 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
1584 device
->dev
.bus_id
, event
, 0);
1586 case ACPI_THERMAL_NOTIFY_DEVICES
:
1587 acpi_thermal_trips_update(tz
, ACPI_TRIPS_REFRESH_DEVICES
);
1588 acpi_thermal_check(tz
);
1589 acpi_bus_generate_proc_event(device
, event
, 0);
1590 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
1591 device
->dev
.bus_id
, event
, 0);
1594 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1595 "Unsupported event [0x%x]\n", event
));
1602 static int acpi_thermal_get_info(struct acpi_thermal
*tz
)
1610 /* Get temperature [_TMP] (required) */
1611 result
= acpi_thermal_get_temperature(tz
);
1615 /* Get trip points [_CRT, _PSV, etc.] (required) */
1616 result
= acpi_thermal_get_trip_points(tz
);
1620 /* Set the cooling mode [_SCP] to active cooling (default) */
1621 result
= acpi_thermal_set_cooling_mode(tz
, ACPI_THERMAL_MODE_ACTIVE
);
1623 tz
->flags
.cooling_mode
= 1;
1625 /* Get default polling frequency [_TZP] (optional) */
1627 tz
->polling_frequency
= tzp
;
1629 acpi_thermal_get_polling_frequency(tz
);
1634 static int acpi_thermal_add(struct acpi_device
*device
)
1637 acpi_status status
= AE_OK
;
1638 struct acpi_thermal
*tz
= NULL
;
1644 tz
= kzalloc(sizeof(struct acpi_thermal
), GFP_KERNEL
);
1648 tz
->device
= device
;
1649 strcpy(tz
->name
, device
->pnp
.bus_id
);
1650 strcpy(acpi_device_name(device
), ACPI_THERMAL_DEVICE_NAME
);
1651 strcpy(acpi_device_class(device
), ACPI_THERMAL_CLASS
);
1652 device
->driver_data
= tz
;
1653 mutex_init(&tz
->lock
);
1656 result
= acpi_thermal_get_info(tz
);
1660 result
= acpi_thermal_register_thermal_zone(tz
);
1664 result
= acpi_thermal_add_fs(device
);
1666 goto unregister_thermal_zone
;
1668 init_timer(&tz
->timer
);
1670 acpi_thermal_active_off(tz
);
1672 acpi_thermal_check(tz
);
1674 status
= acpi_install_notify_handler(device
->handle
,
1676 acpi_thermal_notify
, tz
);
1677 if (ACPI_FAILURE(status
)) {
1682 printk(KERN_INFO PREFIX
"%s [%s] (%ld C)\n",
1683 acpi_device_name(device
), acpi_device_bid(device
),
1684 KELVIN_TO_CELSIUS(tz
->temperature
));
1688 acpi_thermal_remove_fs(device
);
1689 unregister_thermal_zone
:
1690 thermal_zone_device_unregister(tz
->thermal_zone
);
1697 static int acpi_thermal_remove(struct acpi_device
*device
, int type
)
1699 acpi_status status
= AE_OK
;
1700 struct acpi_thermal
*tz
= NULL
;
1703 if (!device
|| !acpi_driver_data(device
))
1706 tz
= acpi_driver_data(device
);
1708 /* avoid timer adding new defer task */
1710 /* wait for running timer (on other CPUs) finish */
1711 del_timer_sync(&(tz
->timer
));
1712 /* synchronize deferred task */
1713 acpi_os_wait_events_complete(NULL
);
1714 /* deferred task may reinsert timer */
1715 del_timer_sync(&(tz
->timer
));
1717 status
= acpi_remove_notify_handler(device
->handle
,
1719 acpi_thermal_notify
);
1721 /* Terminate policy */
1722 if (tz
->trips
.passive
.flags
.valid
&& tz
->trips
.passive
.flags
.enabled
) {
1723 tz
->trips
.passive
.flags
.enabled
= 0;
1724 acpi_thermal_passive(tz
);
1726 if (tz
->trips
.active
[0].flags
.valid
1727 && tz
->trips
.active
[0].flags
.enabled
) {
1728 tz
->trips
.active
[0].flags
.enabled
= 0;
1729 acpi_thermal_active(tz
);
1732 acpi_thermal_remove_fs(device
);
1733 acpi_thermal_unregister_thermal_zone(tz
);
1734 mutex_destroy(&tz
->lock
);
1739 static int acpi_thermal_resume(struct acpi_device
*device
)
1741 struct acpi_thermal
*tz
= NULL
;
1742 int i
, j
, power_state
, result
;
1745 if (!device
|| !acpi_driver_data(device
))
1748 tz
= acpi_driver_data(device
);
1750 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
1751 if (!(&tz
->trips
.active
[i
]))
1753 if (!tz
->trips
.active
[i
].flags
.valid
)
1755 tz
->trips
.active
[i
].flags
.enabled
= 1;
1756 for (j
= 0; j
< tz
->trips
.active
[i
].devices
.count
; j
++) {
1757 result
= acpi_bus_get_power(tz
->trips
.active
[i
].devices
.
1758 handles
[j
], &power_state
);
1759 if (result
|| (power_state
!= ACPI_STATE_D0
)) {
1760 tz
->trips
.active
[i
].flags
.enabled
= 0;
1764 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
1767 acpi_thermal_check(tz
);
1772 static int thermal_act(const struct dmi_system_id
*d
) {
1775 printk(KERN_NOTICE
"ACPI: %s detected: "
1776 "disabling all active thermal trip points\n", d
->ident
);
1781 static int thermal_nocrt(const struct dmi_system_id
*d
) {
1783 printk(KERN_NOTICE
"ACPI: %s detected: "
1784 "disabling all critical thermal trip point actions.\n", d
->ident
);
1788 static int thermal_tzp(const struct dmi_system_id
*d
) {
1791 printk(KERN_NOTICE
"ACPI: %s detected: "
1792 "enabling thermal zone polling\n", d
->ident
);
1793 tzp
= 300; /* 300 dS = 30 Seconds */
1797 static int thermal_psv(const struct dmi_system_id
*d
) {
1800 printk(KERN_NOTICE
"ACPI: %s detected: "
1801 "disabling all passive thermal trip points\n", d
->ident
);
1807 static struct dmi_system_id thermal_dmi_table
[] __initdata
= {
1809 * Award BIOS on this AOpen makes thermal control almost worthless.
1810 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1813 .callback
= thermal_act
,
1814 .ident
= "AOpen i915GMm-HFS",
1816 DMI_MATCH(DMI_BOARD_VENDOR
, "AOpen"),
1817 DMI_MATCH(DMI_BOARD_NAME
, "i915GMm-HFS"),
1821 .callback
= thermal_psv
,
1822 .ident
= "AOpen i915GMm-HFS",
1824 DMI_MATCH(DMI_BOARD_VENDOR
, "AOpen"),
1825 DMI_MATCH(DMI_BOARD_NAME
, "i915GMm-HFS"),
1829 .callback
= thermal_tzp
,
1830 .ident
= "AOpen i915GMm-HFS",
1832 DMI_MATCH(DMI_BOARD_VENDOR
, "AOpen"),
1833 DMI_MATCH(DMI_BOARD_NAME
, "i915GMm-HFS"),
1837 .callback
= thermal_nocrt
,
1838 .ident
= "Gigabyte GA-7ZX",
1840 DMI_MATCH(DMI_BOARD_VENDOR
, "Gigabyte Technology Co., Ltd."),
1841 DMI_MATCH(DMI_BOARD_NAME
, "7ZX"),
1847 static int __init
acpi_thermal_init(void)
1851 dmi_check_system(thermal_dmi_table
);
1854 printk(KERN_NOTICE
"ACPI: thermal control disabled\n");
1857 acpi_thermal_dir
= proc_mkdir(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1858 if (!acpi_thermal_dir
)
1860 acpi_thermal_dir
->owner
= THIS_MODULE
;
1862 result
= acpi_bus_register_driver(&acpi_thermal_driver
);
1864 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1871 static void __exit
acpi_thermal_exit(void)
1874 acpi_bus_unregister_driver(&acpi_thermal_driver
);
1876 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1881 module_init(acpi_thermal_init
);
1882 module_exit(acpi_thermal_exit
);