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>
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 KELVIN_TO_CELSIUS(t) (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
69 #define CELSIUS_TO_KELVIN(t) ((t+273)*10)
71 #define _COMPONENT ACPI_THERMAL_COMPONENT
72 ACPI_MODULE_NAME("thermal");
74 MODULE_AUTHOR("Paul Diefenbaugh");
75 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
76 MODULE_LICENSE("GPL");
79 module_param(act
, int, 0644);
80 MODULE_PARM_DESC(act
, "Disable or override all lowest active trip points.");
83 module_param(crt
, int, 0644);
84 MODULE_PARM_DESC(crt
, "Disable or lower all critical trip points.");
87 module_param(tzp
, int, 0444);
88 MODULE_PARM_DESC(tzp
, "Thermal zone polling frequency, in 1/10 seconds.");
91 module_param(nocrt
, int, 0);
92 MODULE_PARM_DESC(nocrt
, "Set to take no action upon ACPI thermal zone critical trips points.");
95 module_param(off
, int, 0);
96 MODULE_PARM_DESC(off
, "Set to disable ACPI thermal support.");
99 module_param(psv
, int, 0644);
100 MODULE_PARM_DESC(psv
, "Disable or override all passive trip points.");
102 static int acpi_thermal_add(struct acpi_device
*device
);
103 static int acpi_thermal_remove(struct acpi_device
*device
, int type
);
104 static int acpi_thermal_resume(struct acpi_device
*device
);
105 static int acpi_thermal_state_open_fs(struct inode
*inode
, struct file
*file
);
106 static int acpi_thermal_temp_open_fs(struct inode
*inode
, struct file
*file
);
107 static int acpi_thermal_trip_open_fs(struct inode
*inode
, struct file
*file
);
108 static int acpi_thermal_cooling_open_fs(struct inode
*inode
, struct file
*file
);
109 static ssize_t
acpi_thermal_write_cooling_mode(struct file
*,
110 const char __user
*, size_t,
112 static int acpi_thermal_polling_open_fs(struct inode
*inode
, struct file
*file
);
113 static ssize_t
acpi_thermal_write_polling(struct file
*, const char __user
*,
116 static const struct acpi_device_id thermal_device_ids
[] = {
117 {ACPI_THERMAL_HID
, 0},
120 MODULE_DEVICE_TABLE(acpi
, thermal_device_ids
);
122 static struct acpi_driver acpi_thermal_driver
= {
124 .class = ACPI_THERMAL_CLASS
,
125 .ids
= thermal_device_ids
,
127 .add
= acpi_thermal_add
,
128 .remove
= acpi_thermal_remove
,
129 .resume
= acpi_thermal_resume
,
133 struct acpi_thermal_state
{
142 struct acpi_thermal_state_flags
{
148 struct acpi_thermal_critical
{
149 struct acpi_thermal_state_flags flags
;
150 unsigned long temperature
;
153 struct acpi_thermal_hot
{
154 struct acpi_thermal_state_flags flags
;
155 unsigned long temperature
;
158 struct acpi_thermal_passive
{
159 struct acpi_thermal_state_flags flags
;
160 unsigned long temperature
;
164 struct acpi_handle_list devices
;
167 struct acpi_thermal_active
{
168 struct acpi_thermal_state_flags flags
;
169 unsigned long temperature
;
170 struct acpi_handle_list devices
;
173 struct acpi_thermal_trips
{
174 struct acpi_thermal_critical critical
;
175 struct acpi_thermal_hot hot
;
176 struct acpi_thermal_passive passive
;
177 struct acpi_thermal_active active
[ACPI_THERMAL_MAX_ACTIVE
];
180 struct acpi_thermal_flags
{
181 u8 cooling_mode
:1; /* _SCP */
182 u8 devices
:1; /* _TZD */
186 struct acpi_thermal
{
187 struct acpi_device
* device
;
189 unsigned long temperature
;
190 unsigned long last_temperature
;
191 unsigned long polling_frequency
;
193 struct acpi_thermal_flags flags
;
194 struct acpi_thermal_state state
;
195 struct acpi_thermal_trips trips
;
196 struct acpi_handle_list devices
;
197 struct timer_list timer
;
200 static const struct file_operations acpi_thermal_state_fops
= {
201 .open
= acpi_thermal_state_open_fs
,
204 .release
= single_release
,
207 static const struct file_operations acpi_thermal_temp_fops
= {
208 .open
= acpi_thermal_temp_open_fs
,
211 .release
= single_release
,
214 static const struct file_operations acpi_thermal_trip_fops
= {
215 .open
= acpi_thermal_trip_open_fs
,
218 .release
= single_release
,
221 static const struct file_operations acpi_thermal_cooling_fops
= {
222 .open
= acpi_thermal_cooling_open_fs
,
224 .write
= acpi_thermal_write_cooling_mode
,
226 .release
= single_release
,
229 static const struct file_operations acpi_thermal_polling_fops
= {
230 .open
= acpi_thermal_polling_open_fs
,
232 .write
= acpi_thermal_write_polling
,
234 .release
= single_release
,
237 /* --------------------------------------------------------------------------
238 Thermal Zone Management
239 -------------------------------------------------------------------------- */
241 static int acpi_thermal_get_temperature(struct acpi_thermal
*tz
)
243 acpi_status status
= AE_OK
;
249 tz
->last_temperature
= tz
->temperature
;
252 acpi_evaluate_integer(tz
->device
->handle
, "_TMP", NULL
, &tz
->temperature
);
253 if (ACPI_FAILURE(status
))
256 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Temperature is %lu dK\n",
262 static int acpi_thermal_get_polling_frequency(struct acpi_thermal
*tz
)
264 acpi_status status
= AE_OK
;
271 acpi_evaluate_integer(tz
->device
->handle
, "_TZP", NULL
,
272 &tz
->polling_frequency
);
273 if (ACPI_FAILURE(status
))
276 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Polling frequency is %lu dS\n",
277 tz
->polling_frequency
));
282 static int acpi_thermal_set_polling(struct acpi_thermal
*tz
, int seconds
)
288 tz
->polling_frequency
= seconds
* 10; /* Convert value to deci-seconds */
290 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
291 "Polling frequency set to %lu seconds\n",
292 tz
->polling_frequency
/10));
297 static int acpi_thermal_set_cooling_mode(struct acpi_thermal
*tz
, int mode
)
299 acpi_status status
= AE_OK
;
300 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
301 struct acpi_object_list arg_list
= { 1, &arg0
};
302 acpi_handle handle
= NULL
;
308 status
= acpi_get_handle(tz
->device
->handle
, "_SCP", &handle
);
309 if (ACPI_FAILURE(status
)) {
310 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "_SCP not present\n"));
314 arg0
.integer
.value
= mode
;
316 status
= acpi_evaluate_object(handle
, NULL
, &arg_list
, NULL
);
317 if (ACPI_FAILURE(status
))
323 static int acpi_thermal_get_trip_points(struct acpi_thermal
*tz
)
325 acpi_status status
= AE_OK
;
332 /* Critical Shutdown (required) */
334 status
= acpi_evaluate_integer(tz
->device
->handle
, "_CRT", NULL
,
335 &tz
->trips
.critical
.temperature
);
336 if (ACPI_FAILURE(status
)) {
337 tz
->trips
.critical
.flags
.valid
= 0;
338 ACPI_EXCEPTION((AE_INFO
, status
, "No critical threshold"));
341 tz
->trips
.critical
.flags
.valid
= 1;
342 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
343 "Found critical threshold [%lu]\n",
344 tz
->trips
.critical
.temperature
));
347 if (tz
->trips
.critical
.flags
.valid
== 1) {
349 tz
->trips
.critical
.flags
.valid
= 0;
350 } else if (crt
> 0) {
351 unsigned long crt_k
= CELSIUS_TO_KELVIN(crt
);
354 * Allow override to lower critical threshold
356 if (crt_k
< tz
->trips
.critical
.temperature
)
357 tz
->trips
.critical
.temperature
= crt_k
;
361 /* Critical Sleep (optional) */
364 acpi_evaluate_integer(tz
->device
->handle
, "_HOT", NULL
,
365 &tz
->trips
.hot
.temperature
);
366 if (ACPI_FAILURE(status
)) {
367 tz
->trips
.hot
.flags
.valid
= 0;
368 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No hot threshold\n"));
370 tz
->trips
.hot
.flags
.valid
= 1;
371 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found hot threshold [%lu]\n",
372 tz
->trips
.hot
.temperature
));
375 /* Passive: Processors (optional) */
379 } else if (psv
> 0) {
380 tz
->trips
.passive
.temperature
= CELSIUS_TO_KELVIN(psv
);
383 status
= acpi_evaluate_integer(tz
->device
->handle
,
384 "_PSV", NULL
, &tz
->trips
.passive
.temperature
);
387 if (ACPI_FAILURE(status
)) {
388 tz
->trips
.passive
.flags
.valid
= 0;
389 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No passive threshold\n"));
391 tz
->trips
.passive
.flags
.valid
= 1;
394 acpi_evaluate_integer(tz
->device
->handle
, "_TC1", NULL
,
395 &tz
->trips
.passive
.tc1
);
396 if (ACPI_FAILURE(status
))
397 tz
->trips
.passive
.flags
.valid
= 0;
400 acpi_evaluate_integer(tz
->device
->handle
, "_TC2", NULL
,
401 &tz
->trips
.passive
.tc2
);
402 if (ACPI_FAILURE(status
))
403 tz
->trips
.passive
.flags
.valid
= 0;
406 acpi_evaluate_integer(tz
->device
->handle
, "_TSP", NULL
,
407 &tz
->trips
.passive
.tsp
);
408 if (ACPI_FAILURE(status
))
409 tz
->trips
.passive
.flags
.valid
= 0;
412 acpi_evaluate_reference(tz
->device
->handle
, "_PSL", NULL
,
413 &tz
->trips
.passive
.devices
);
414 if (ACPI_FAILURE(status
))
415 tz
->trips
.passive
.flags
.valid
= 0;
417 if (!tz
->trips
.passive
.flags
.valid
)
418 printk(KERN_WARNING PREFIX
"Invalid passive threshold\n");
420 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
421 "Found passive threshold [%lu]\n",
422 tz
->trips
.passive
.temperature
));
425 /* Active: Fans, etc. (optional) */
427 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
429 char name
[5] = { '_', 'A', 'C', ('0' + i
), '\0' };
432 break; /* disable all active trip points */
434 status
= acpi_evaluate_integer(tz
->device
->handle
,
435 name
, NULL
, &tz
->trips
.active
[i
].temperature
);
437 if (ACPI_FAILURE(status
)) {
438 if (i
== 0) /* no active trip points */
440 if (act
<= 0) /* no override requested */
442 if (i
== 1) { /* 1 trip point */
443 tz
->trips
.active
[0].temperature
=
444 CELSIUS_TO_KELVIN(act
);
445 } else { /* multiple trips */
447 * Don't allow override higher than
448 * the next higher trip point
450 tz
->trips
.active
[i
- 1].temperature
=
451 (tz
->trips
.active
[i
- 2].temperature
<
452 CELSIUS_TO_KELVIN(act
) ?
453 tz
->trips
.active
[i
- 2].temperature
:
454 CELSIUS_TO_KELVIN(act
));
461 acpi_evaluate_reference(tz
->device
->handle
, name
, NULL
,
462 &tz
->trips
.active
[i
].devices
);
463 if (ACPI_SUCCESS(status
)) {
464 tz
->trips
.active
[i
].flags
.valid
= 1;
465 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
466 "Found active threshold [%d]:[%lu]\n",
467 i
, tz
->trips
.active
[i
].temperature
));
469 ACPI_EXCEPTION((AE_INFO
, status
,
470 "Invalid active threshold [%d]", i
));
476 static int acpi_thermal_get_devices(struct acpi_thermal
*tz
)
478 acpi_status status
= AE_OK
;
485 acpi_evaluate_reference(tz
->device
->handle
, "_TZD", NULL
, &tz
->devices
);
486 if (ACPI_FAILURE(status
))
492 static int acpi_thermal_critical(struct acpi_thermal
*tz
)
494 if (!tz
|| !tz
->trips
.critical
.flags
.valid
|| nocrt
)
497 if (tz
->temperature
>= tz
->trips
.critical
.temperature
) {
498 printk(KERN_WARNING PREFIX
"Critical trip point\n");
499 tz
->trips
.critical
.flags
.enabled
= 1;
500 } else if (tz
->trips
.critical
.flags
.enabled
)
501 tz
->trips
.critical
.flags
.enabled
= 0;
504 "Critical temperature reached (%ld C), shutting down.\n",
505 KELVIN_TO_CELSIUS(tz
->temperature
));
506 acpi_bus_generate_event(tz
->device
, ACPI_THERMAL_NOTIFY_CRITICAL
,
507 tz
->trips
.critical
.flags
.enabled
);
509 orderly_poweroff(true);
514 static int acpi_thermal_hot(struct acpi_thermal
*tz
)
516 if (!tz
|| !tz
->trips
.hot
.flags
.valid
|| nocrt
)
519 if (tz
->temperature
>= tz
->trips
.hot
.temperature
) {
520 printk(KERN_WARNING PREFIX
"Hot trip point\n");
521 tz
->trips
.hot
.flags
.enabled
= 1;
522 } else if (tz
->trips
.hot
.flags
.enabled
)
523 tz
->trips
.hot
.flags
.enabled
= 0;
525 acpi_bus_generate_event(tz
->device
, ACPI_THERMAL_NOTIFY_HOT
,
526 tz
->trips
.hot
.flags
.enabled
);
528 /* TBD: Call user-mode "sleep(S4)" function */
533 static void acpi_thermal_passive(struct acpi_thermal
*tz
)
536 struct acpi_thermal_passive
*passive
= NULL
;
541 if (!tz
|| !tz
->trips
.passive
.flags
.valid
)
544 passive
= &(tz
->trips
.passive
);
549 * Calculate the thermal trend (using the passive cooling equation)
550 * and modify the performance limit for all passive cooling devices
551 * accordingly. Note that we assume symmetry.
553 if (tz
->temperature
>= passive
->temperature
) {
555 (passive
->tc1
* (tz
->temperature
- tz
->last_temperature
)) +
556 (passive
->tc2
* (tz
->temperature
- passive
->temperature
));
557 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
558 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
559 trend
, passive
->tc1
, tz
->temperature
,
560 tz
->last_temperature
, passive
->tc2
,
561 tz
->temperature
, passive
->temperature
));
562 passive
->flags
.enabled
= 1;
565 for (i
= 0; i
< passive
->devices
.count
; i
++)
566 acpi_processor_set_thermal_limit(passive
->
569 ACPI_PROCESSOR_LIMIT_INCREMENT
);
571 else if (trend
< 0) {
572 for (i
= 0; i
< passive
->devices
.count
; i
++)
574 * assume that we are on highest
575 * freq/lowest thrott and can leave
576 * passive mode, even in error case
578 if (!acpi_processor_set_thermal_limit
579 (passive
->devices
.handles
[i
],
580 ACPI_PROCESSOR_LIMIT_DECREMENT
))
583 * Leave cooling mode, even if the temp might
584 * higher than trip point This is because some
585 * machines might have long thermal polling
586 * frequencies (tsp) defined. We will fall back
587 * into passive mode in next cycle (probably quicker)
590 passive
->flags
.enabled
= 0;
591 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
592 "Disabling passive cooling, still above threshold,"
593 " but we are cooling down\n"));
602 * Implement passive cooling hysteresis to slowly increase performance
603 * and avoid thrashing around the passive trip point. Note that we
606 if (!passive
->flags
.enabled
)
608 for (i
= 0; i
< passive
->devices
.count
; i
++)
609 if (!acpi_processor_set_thermal_limit
610 (passive
->devices
.handles
[i
],
611 ACPI_PROCESSOR_LIMIT_DECREMENT
))
614 passive
->flags
.enabled
= 0;
615 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
616 "Disabling passive cooling (zone is cool)\n"));
620 static void acpi_thermal_active(struct acpi_thermal
*tz
)
623 struct acpi_thermal_active
*active
= NULL
;
626 unsigned long maxtemp
= 0;
632 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
633 active
= &(tz
->trips
.active
[i
]);
634 if (!active
|| !active
->flags
.valid
)
636 if (tz
->temperature
>= active
->temperature
) {
640 * If not already enabled, turn ON all cooling devices
641 * associated with this active threshold.
643 if (active
->temperature
> maxtemp
)
644 tz
->state
.active_index
= i
;
645 maxtemp
= active
->temperature
;
646 if (active
->flags
.enabled
)
648 for (j
= 0; j
< active
->devices
.count
; j
++) {
650 acpi_bus_set_power(active
->devices
.
654 printk(KERN_WARNING PREFIX
655 "Unable to turn cooling device [%p] 'on'\n",
660 active
->flags
.enabled
= 1;
661 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
662 "Cooling device [%p] now 'on'\n",
663 active
->devices
.handles
[j
]));
667 if (!active
->flags
.enabled
)
672 * Turn OFF all cooling devices associated with this
675 for (j
= 0; j
< active
->devices
.count
; j
++) {
676 result
= acpi_bus_set_power(active
->devices
.handles
[j
],
679 printk(KERN_WARNING PREFIX
680 "Unable to turn cooling device [%p] 'off'\n",
681 active
->devices
.handles
[j
]);
684 active
->flags
.enabled
= 0;
685 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
686 "Cooling device [%p] now 'off'\n",
687 active
->devices
.handles
[j
]));
692 static void acpi_thermal_check(void *context
);
694 static void acpi_thermal_run(unsigned long data
)
696 struct acpi_thermal
*tz
= (struct acpi_thermal
*)data
;
698 acpi_os_execute(OSL_GPE_HANDLER
, acpi_thermal_check
, (void *)data
);
701 static void acpi_thermal_check(void *data
)
704 struct acpi_thermal
*tz
= data
;
705 unsigned long sleep_time
= 0;
707 struct acpi_thermal_state state
;
711 printk(KERN_ERR PREFIX
"Invalid (NULL) context\n");
717 result
= acpi_thermal_get_temperature(tz
);
721 memset(&tz
->state
, 0, sizeof(tz
->state
));
726 * Compare the current temperature to the trip point values to see
727 * if we've entered one of the thermal policy states. Note that
728 * this function determines when a state is entered, but the
729 * individual policy decides when it is exited (e.g. hysteresis).
731 if (tz
->trips
.critical
.flags
.valid
)
733 (tz
->temperature
>= tz
->trips
.critical
.temperature
);
734 if (tz
->trips
.hot
.flags
.valid
)
735 state
.hot
|= (tz
->temperature
>= tz
->trips
.hot
.temperature
);
736 if (tz
->trips
.passive
.flags
.valid
)
738 (tz
->temperature
>= tz
->trips
.passive
.temperature
);
739 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
740 if (tz
->trips
.active
[i
].flags
.valid
)
743 tz
->trips
.active
[i
].temperature
);
748 * Separated from the above check to allow individual policy to
749 * determine when to exit a given state.
752 acpi_thermal_critical(tz
);
754 acpi_thermal_hot(tz
);
756 acpi_thermal_passive(tz
);
758 acpi_thermal_active(tz
);
763 * Again, separated from the above two to allow independent policy
766 tz
->state
.critical
= tz
->trips
.critical
.flags
.enabled
;
767 tz
->state
.hot
= tz
->trips
.hot
.flags
.enabled
;
768 tz
->state
.passive
= tz
->trips
.passive
.flags
.enabled
;
769 tz
->state
.active
= 0;
770 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
771 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
774 * Calculate Sleep Time
775 * --------------------
776 * If we're in the passive state, use _TSP's value. Otherwise
777 * use the default polling frequency (e.g. _TZP). If no polling
778 * frequency is specified then we'll wait forever (at least until
779 * a thermal event occurs). Note that _TSP and _TZD values are
780 * given in 1/10th seconds (we must covert to milliseconds).
782 if (tz
->state
.passive
)
783 sleep_time
= tz
->trips
.passive
.tsp
* 100;
784 else if (tz
->polling_frequency
> 0)
785 sleep_time
= tz
->polling_frequency
* 100;
787 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "%s: temperature[%lu] sleep[%lu]\n",
788 tz
->name
, tz
->temperature
, sleep_time
));
795 if (timer_pending(&(tz
->timer
)))
796 del_timer(&(tz
->timer
));
798 if (timer_pending(&(tz
->timer
)))
799 mod_timer(&(tz
->timer
),
800 jiffies
+ (HZ
* sleep_time
) / 1000);
802 tz
->timer
.data
= (unsigned long)tz
;
803 tz
->timer
.function
= acpi_thermal_run
;
804 tz
->timer
.expires
= jiffies
+ (HZ
* sleep_time
) / 1000;
805 add_timer(&(tz
->timer
));
812 /* --------------------------------------------------------------------------
814 -------------------------------------------------------------------------- */
816 static struct proc_dir_entry
*acpi_thermal_dir
;
818 static int acpi_thermal_state_seq_show(struct seq_file
*seq
, void *offset
)
820 struct acpi_thermal
*tz
= seq
->private;
826 seq_puts(seq
, "state: ");
828 if (!tz
->state
.critical
&& !tz
->state
.hot
&& !tz
->state
.passive
829 && !tz
->state
.active
)
830 seq_puts(seq
, "ok\n");
832 if (tz
->state
.critical
)
833 seq_puts(seq
, "critical ");
835 seq_puts(seq
, "hot ");
836 if (tz
->state
.passive
)
837 seq_puts(seq
, "passive ");
838 if (tz
->state
.active
)
839 seq_printf(seq
, "active[%d]", tz
->state
.active_index
);
847 static int acpi_thermal_state_open_fs(struct inode
*inode
, struct file
*file
)
849 return single_open(file
, acpi_thermal_state_seq_show
, PDE(inode
)->data
);
852 static int acpi_thermal_temp_seq_show(struct seq_file
*seq
, void *offset
)
855 struct acpi_thermal
*tz
= seq
->private;
861 result
= acpi_thermal_get_temperature(tz
);
865 seq_printf(seq
, "temperature: %ld C\n",
866 KELVIN_TO_CELSIUS(tz
->temperature
));
872 static int acpi_thermal_temp_open_fs(struct inode
*inode
, struct file
*file
)
874 return single_open(file
, acpi_thermal_temp_seq_show
, PDE(inode
)->data
);
877 static int acpi_thermal_trip_seq_show(struct seq_file
*seq
, void *offset
)
879 struct acpi_thermal
*tz
= seq
->private;
880 struct acpi_device
*device
;
890 if (tz
->trips
.critical
.flags
.valid
)
891 seq_printf(seq
, "critical (S5): %ld C%s",
892 KELVIN_TO_CELSIUS(tz
->trips
.critical
.temperature
),
893 nocrt
? " <disabled>\n" : "\n");
895 if (tz
->trips
.hot
.flags
.valid
)
896 seq_printf(seq
, "hot (S4): %ld C%s",
897 KELVIN_TO_CELSIUS(tz
->trips
.hot
.temperature
),
898 nocrt
? " <disabled>\n" : "\n");
900 if (tz
->trips
.passive
.flags
.valid
) {
902 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
903 KELVIN_TO_CELSIUS(tz
->trips
.passive
.temperature
),
904 tz
->trips
.passive
.tc1
, tz
->trips
.passive
.tc2
,
905 tz
->trips
.passive
.tsp
);
906 for (j
= 0; j
< tz
->trips
.passive
.devices
.count
; j
++) {
907 status
= acpi_bus_get_device(tz
->trips
.passive
.devices
.
908 handles
[j
], &device
);
909 seq_printf(seq
, "%4.4s ", status
? "" :
910 acpi_device_bid(device
));
915 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
916 if (!(tz
->trips
.active
[i
].flags
.valid
))
918 seq_printf(seq
, "active[%d]: %ld C: devices=",
920 KELVIN_TO_CELSIUS(tz
->trips
.active
[i
].temperature
));
921 for (j
= 0; j
< tz
->trips
.active
[i
].devices
.count
; j
++){
922 status
= acpi_bus_get_device(tz
->trips
.active
[i
].
925 seq_printf(seq
, "%4.4s ", status
? "" :
926 acpi_device_bid(device
));
935 static int acpi_thermal_trip_open_fs(struct inode
*inode
, struct file
*file
)
937 return single_open(file
, acpi_thermal_trip_seq_show
, PDE(inode
)->data
);
940 static int acpi_thermal_cooling_seq_show(struct seq_file
*seq
, void *offset
)
942 struct acpi_thermal
*tz
= seq
->private;
948 if (!tz
->flags
.cooling_mode
)
949 seq_puts(seq
, "<setting not supported>\n");
951 seq_puts(seq
, "0 - Active; 1 - Passive\n");
957 static int acpi_thermal_cooling_open_fs(struct inode
*inode
, struct file
*file
)
959 return single_open(file
, acpi_thermal_cooling_seq_show
,
964 acpi_thermal_write_cooling_mode(struct file
*file
,
965 const char __user
* buffer
,
966 size_t count
, loff_t
* ppos
)
968 struct seq_file
*m
= file
->private_data
;
969 struct acpi_thermal
*tz
= m
->private;
971 char mode_string
[12] = { '\0' };
974 if (!tz
|| (count
> sizeof(mode_string
) - 1))
977 if (!tz
->flags
.cooling_mode
)
980 if (copy_from_user(mode_string
, buffer
, count
))
983 mode_string
[count
] = '\0';
985 result
= acpi_thermal_set_cooling_mode(tz
,
986 simple_strtoul(mode_string
, NULL
,
991 acpi_thermal_check(tz
);
996 static int acpi_thermal_polling_seq_show(struct seq_file
*seq
, void *offset
)
998 struct acpi_thermal
*tz
= seq
->private;
1004 if (!tz
->polling_frequency
) {
1005 seq_puts(seq
, "<polling disabled>\n");
1009 seq_printf(seq
, "polling frequency: %lu seconds\n",
1010 (tz
->polling_frequency
/ 10));
1016 static int acpi_thermal_polling_open_fs(struct inode
*inode
, struct file
*file
)
1018 return single_open(file
, acpi_thermal_polling_seq_show
,
1023 acpi_thermal_write_polling(struct file
*file
,
1024 const char __user
* buffer
,
1025 size_t count
, loff_t
* ppos
)
1027 struct seq_file
*m
= file
->private_data
;
1028 struct acpi_thermal
*tz
= m
->private;
1030 char polling_string
[12] = { '\0' };
1034 if (!tz
|| (count
> sizeof(polling_string
) - 1))
1037 if (copy_from_user(polling_string
, buffer
, count
))
1040 polling_string
[count
] = '\0';
1042 seconds
= simple_strtoul(polling_string
, NULL
, 0);
1044 result
= acpi_thermal_set_polling(tz
, seconds
);
1048 acpi_thermal_check(tz
);
1053 static int acpi_thermal_add_fs(struct acpi_device
*device
)
1055 struct proc_dir_entry
*entry
= NULL
;
1058 if (!acpi_device_dir(device
)) {
1059 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
1061 if (!acpi_device_dir(device
))
1063 acpi_device_dir(device
)->owner
= THIS_MODULE
;
1067 entry
= create_proc_entry(ACPI_THERMAL_FILE_STATE
,
1068 S_IRUGO
, acpi_device_dir(device
));
1072 entry
->proc_fops
= &acpi_thermal_state_fops
;
1073 entry
->data
= acpi_driver_data(device
);
1074 entry
->owner
= THIS_MODULE
;
1077 /* 'temperature' [R] */
1078 entry
= create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE
,
1079 S_IRUGO
, acpi_device_dir(device
));
1083 entry
->proc_fops
= &acpi_thermal_temp_fops
;
1084 entry
->data
= acpi_driver_data(device
);
1085 entry
->owner
= THIS_MODULE
;
1088 /* 'trip_points' [R] */
1089 entry
= create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS
,
1091 acpi_device_dir(device
));
1095 entry
->proc_fops
= &acpi_thermal_trip_fops
;
1096 entry
->data
= acpi_driver_data(device
);
1097 entry
->owner
= THIS_MODULE
;
1100 /* 'cooling_mode' [R/W] */
1101 entry
= create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE
,
1102 S_IFREG
| S_IRUGO
| S_IWUSR
,
1103 acpi_device_dir(device
));
1107 entry
->proc_fops
= &acpi_thermal_cooling_fops
;
1108 entry
->data
= acpi_driver_data(device
);
1109 entry
->owner
= THIS_MODULE
;
1112 /* 'polling_frequency' [R/W] */
1113 entry
= create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ
,
1114 S_IFREG
| S_IRUGO
| S_IWUSR
,
1115 acpi_device_dir(device
));
1119 entry
->proc_fops
= &acpi_thermal_polling_fops
;
1120 entry
->data
= acpi_driver_data(device
);
1121 entry
->owner
= THIS_MODULE
;
1127 static int acpi_thermal_remove_fs(struct acpi_device
*device
)
1130 if (acpi_device_dir(device
)) {
1131 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ
,
1132 acpi_device_dir(device
));
1133 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE
,
1134 acpi_device_dir(device
));
1135 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS
,
1136 acpi_device_dir(device
));
1137 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE
,
1138 acpi_device_dir(device
));
1139 remove_proc_entry(ACPI_THERMAL_FILE_STATE
,
1140 acpi_device_dir(device
));
1141 remove_proc_entry(acpi_device_bid(device
), acpi_thermal_dir
);
1142 acpi_device_dir(device
) = NULL
;
1148 /* --------------------------------------------------------------------------
1150 -------------------------------------------------------------------------- */
1152 static void acpi_thermal_notify(acpi_handle handle
, u32 event
, void *data
)
1154 struct acpi_thermal
*tz
= data
;
1155 struct acpi_device
*device
= NULL
;
1161 device
= tz
->device
;
1164 case ACPI_THERMAL_NOTIFY_TEMPERATURE
:
1165 acpi_thermal_check(tz
);
1167 case ACPI_THERMAL_NOTIFY_THRESHOLDS
:
1168 acpi_thermal_get_trip_points(tz
);
1169 acpi_thermal_check(tz
);
1170 acpi_bus_generate_event(device
, event
, 0);
1172 case ACPI_THERMAL_NOTIFY_DEVICES
:
1173 if (tz
->flags
.devices
)
1174 acpi_thermal_get_devices(tz
);
1175 acpi_bus_generate_event(device
, event
, 0);
1178 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1179 "Unsupported event [0x%x]\n", event
));
1186 static int acpi_thermal_get_info(struct acpi_thermal
*tz
)
1194 /* Get temperature [_TMP] (required) */
1195 result
= acpi_thermal_get_temperature(tz
);
1199 /* Get trip points [_CRT, _PSV, etc.] (required) */
1200 result
= acpi_thermal_get_trip_points(tz
);
1204 /* Set the cooling mode [_SCP] to active cooling (default) */
1205 result
= acpi_thermal_set_cooling_mode(tz
, ACPI_THERMAL_MODE_ACTIVE
);
1207 tz
->flags
.cooling_mode
= 1;
1209 /* Get default polling frequency [_TZP] (optional) */
1211 tz
->polling_frequency
= tzp
;
1213 acpi_thermal_get_polling_frequency(tz
);
1215 /* Get devices in this thermal zone [_TZD] (optional) */
1216 result
= acpi_thermal_get_devices(tz
);
1218 tz
->flags
.devices
= 1;
1223 static int acpi_thermal_add(struct acpi_device
*device
)
1226 acpi_status status
= AE_OK
;
1227 struct acpi_thermal
*tz
= NULL
;
1233 tz
= kzalloc(sizeof(struct acpi_thermal
), GFP_KERNEL
);
1237 tz
->device
= device
;
1238 strcpy(tz
->name
, device
->pnp
.bus_id
);
1239 strcpy(acpi_device_name(device
), ACPI_THERMAL_DEVICE_NAME
);
1240 strcpy(acpi_device_class(device
), ACPI_THERMAL_CLASS
);
1241 acpi_driver_data(device
) = tz
;
1243 result
= acpi_thermal_get_info(tz
);
1247 result
= acpi_thermal_add_fs(device
);
1251 init_timer(&tz
->timer
);
1253 acpi_thermal_check(tz
);
1255 status
= acpi_install_notify_handler(device
->handle
,
1257 acpi_thermal_notify
, tz
);
1258 if (ACPI_FAILURE(status
)) {
1263 printk(KERN_INFO PREFIX
"%s [%s] (%ld C)\n",
1264 acpi_device_name(device
), acpi_device_bid(device
),
1265 KELVIN_TO_CELSIUS(tz
->temperature
));
1269 acpi_thermal_remove_fs(device
);
1276 static int acpi_thermal_remove(struct acpi_device
*device
, int type
)
1278 acpi_status status
= AE_OK
;
1279 struct acpi_thermal
*tz
= NULL
;
1282 if (!device
|| !acpi_driver_data(device
))
1285 tz
= acpi_driver_data(device
);
1287 /* avoid timer adding new defer task */
1289 /* wait for running timer (on other CPUs) finish */
1290 del_timer_sync(&(tz
->timer
));
1291 /* synchronize deferred task */
1292 acpi_os_wait_events_complete(NULL
);
1293 /* deferred task may reinsert timer */
1294 del_timer_sync(&(tz
->timer
));
1296 status
= acpi_remove_notify_handler(device
->handle
,
1298 acpi_thermal_notify
);
1300 /* Terminate policy */
1301 if (tz
->trips
.passive
.flags
.valid
&& tz
->trips
.passive
.flags
.enabled
) {
1302 tz
->trips
.passive
.flags
.enabled
= 0;
1303 acpi_thermal_passive(tz
);
1305 if (tz
->trips
.active
[0].flags
.valid
1306 && tz
->trips
.active
[0].flags
.enabled
) {
1307 tz
->trips
.active
[0].flags
.enabled
= 0;
1308 acpi_thermal_active(tz
);
1311 acpi_thermal_remove_fs(device
);
1317 static int acpi_thermal_resume(struct acpi_device
*device
)
1319 struct acpi_thermal
*tz
= NULL
;
1320 int i
, j
, power_state
, result
;
1323 if (!device
|| !acpi_driver_data(device
))
1326 tz
= acpi_driver_data(device
);
1328 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
1329 if (!(&tz
->trips
.active
[i
]))
1331 if (!tz
->trips
.active
[i
].flags
.valid
)
1333 tz
->trips
.active
[i
].flags
.enabled
= 1;
1334 for (j
= 0; j
< tz
->trips
.active
[i
].devices
.count
; j
++) {
1335 result
= acpi_bus_get_power(tz
->trips
.active
[i
].devices
.
1336 handles
[j
], &power_state
);
1337 if (result
|| (power_state
!= ACPI_STATE_D0
)) {
1338 tz
->trips
.active
[i
].flags
.enabled
= 0;
1342 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
1345 acpi_thermal_check(tz
);
1351 static int thermal_act(struct dmi_system_id
*d
) {
1354 printk(KERN_NOTICE
"ACPI: %s detected: "
1355 "disabling all active thermal trip points\n", d
->ident
);
1360 static int thermal_nocrt(struct dmi_system_id
*d
) {
1362 printk(KERN_NOTICE
"ACPI: %s detected: "
1363 "disabling all critical thermal trip point actions.\n", d
->ident
);
1367 static int thermal_tzp(struct dmi_system_id
*d
) {
1370 printk(KERN_NOTICE
"ACPI: %s detected: "
1371 "enabling thermal zone polling\n", d
->ident
);
1372 tzp
= 300; /* 300 dS = 30 Seconds */
1376 static int thermal_psv(struct dmi_system_id
*d
) {
1379 printk(KERN_NOTICE
"ACPI: %s detected: "
1380 "disabling all passive thermal trip points\n", d
->ident
);
1386 static struct dmi_system_id thermal_dmi_table
[] __initdata
= {
1388 * Award BIOS on this AOpen makes thermal control almost worthless.
1389 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1392 .callback
= thermal_act
,
1393 .ident
= "AOpen i915GMm-HFS",
1395 DMI_MATCH(DMI_BOARD_VENDOR
, "AOpen"),
1396 DMI_MATCH(DMI_BOARD_NAME
, "i915GMm-HFS"),
1400 .callback
= thermal_psv
,
1401 .ident
= "AOpen i915GMm-HFS",
1403 DMI_MATCH(DMI_BOARD_VENDOR
, "AOpen"),
1404 DMI_MATCH(DMI_BOARD_NAME
, "i915GMm-HFS"),
1408 .callback
= thermal_tzp
,
1409 .ident
= "AOpen i915GMm-HFS",
1411 DMI_MATCH(DMI_BOARD_VENDOR
, "AOpen"),
1412 DMI_MATCH(DMI_BOARD_NAME
, "i915GMm-HFS"),
1416 .callback
= thermal_nocrt
,
1417 .ident
= "Gigabyte GA-7ZX",
1419 DMI_MATCH(DMI_BOARD_VENDOR
, "Gigabyte Technology Co., Ltd."),
1420 DMI_MATCH(DMI_BOARD_NAME
, "7ZX"),
1425 #endif /* CONFIG_DMI */
1427 static int __init
acpi_thermal_init(void)
1431 dmi_check_system(thermal_dmi_table
);
1434 printk(KERN_NOTICE
"ACPI: thermal control disabled\n");
1437 acpi_thermal_dir
= proc_mkdir(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1438 if (!acpi_thermal_dir
)
1440 acpi_thermal_dir
->owner
= THIS_MODULE
;
1442 result
= acpi_bus_register_driver(&acpi_thermal_driver
);
1444 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1451 static void __exit
acpi_thermal_exit(void)
1454 acpi_bus_unregister_driver(&acpi_thermal_driver
);
1456 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1461 module_init(acpi_thermal_init
);
1462 module_exit(acpi_thermal_exit
);