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/init.h>
37 #include <linux/types.h>
38 #include <linux/proc_fs.h>
39 #include <linux/sched.h>
40 #include <linux/kmod.h>
41 #include <linux/seq_file.h>
42 #include <asm/uaccess.h>
44 #include <acpi/acpi_bus.h>
45 #include <acpi/acpi_drivers.h>
47 #define ACPI_THERMAL_COMPONENT 0x04000000
48 #define ACPI_THERMAL_CLASS "thermal_zone"
49 #define ACPI_THERMAL_DRIVER_NAME "ACPI Thermal Zone Driver"
50 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
51 #define ACPI_THERMAL_FILE_STATE "state"
52 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
53 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
54 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
55 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
56 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
57 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
58 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82
59 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
60 #define ACPI_THERMAL_NOTIFY_HOT 0xF1
61 #define ACPI_THERMAL_MODE_ACTIVE 0x00
62 #define ACPI_THERMAL_MODE_PASSIVE 0x01
63 #define ACPI_THERMAL_MODE_CRITICAL 0xff
64 #define ACPI_THERMAL_PATH_POWEROFF "/sbin/poweroff"
66 #define ACPI_THERMAL_MAX_ACTIVE 10
67 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
69 #define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
70 #define CELSIUS_TO_KELVIN(t) ((t+273)*10)
72 #define _COMPONENT ACPI_THERMAL_COMPONENT
73 ACPI_MODULE_NAME("acpi_thermal")
75 MODULE_AUTHOR("Paul Diefenbaugh");
76 MODULE_DESCRIPTION(ACPI_THERMAL_DRIVER_NAME
);
77 MODULE_LICENSE("GPL");
80 module_param(tzp
, int, 0);
81 MODULE_PARM_DESC(tzp
, "Thermal zone polling frequency, in 1/10 seconds.\n");
83 static int acpi_thermal_add(struct acpi_device
*device
);
84 static int acpi_thermal_remove(struct acpi_device
*device
, int type
);
85 static int acpi_thermal_state_open_fs(struct inode
*inode
, struct file
*file
);
86 static int acpi_thermal_temp_open_fs(struct inode
*inode
, struct file
*file
);
87 static int acpi_thermal_trip_open_fs(struct inode
*inode
, struct file
*file
);
88 static ssize_t
acpi_thermal_write_trip_points(struct file
*,
89 const char __user
*, size_t,
91 static int acpi_thermal_cooling_open_fs(struct inode
*inode
, struct file
*file
);
92 static ssize_t
acpi_thermal_write_cooling_mode(struct file
*,
93 const char __user
*, size_t,
95 static int acpi_thermal_polling_open_fs(struct inode
*inode
, struct file
*file
);
96 static ssize_t
acpi_thermal_write_polling(struct file
*, const char __user
*,
99 static struct acpi_driver acpi_thermal_driver
= {
100 .name
= ACPI_THERMAL_DRIVER_NAME
,
101 .class = ACPI_THERMAL_CLASS
,
102 .ids
= ACPI_THERMAL_HID
,
104 .add
= acpi_thermal_add
,
105 .remove
= acpi_thermal_remove
,
109 struct acpi_thermal_state
{
118 struct acpi_thermal_state_flags
{
124 struct acpi_thermal_critical
{
125 struct acpi_thermal_state_flags flags
;
126 unsigned long temperature
;
129 struct acpi_thermal_hot
{
130 struct acpi_thermal_state_flags flags
;
131 unsigned long temperature
;
134 struct acpi_thermal_passive
{
135 struct acpi_thermal_state_flags flags
;
136 unsigned long temperature
;
140 struct acpi_handle_list devices
;
143 struct acpi_thermal_active
{
144 struct acpi_thermal_state_flags flags
;
145 unsigned long temperature
;
146 struct acpi_handle_list devices
;
149 struct acpi_thermal_trips
{
150 struct acpi_thermal_critical critical
;
151 struct acpi_thermal_hot hot
;
152 struct acpi_thermal_passive passive
;
153 struct acpi_thermal_active active
[ACPI_THERMAL_MAX_ACTIVE
];
156 struct acpi_thermal_flags
{
157 u8 cooling_mode
:1; /* _SCP */
158 u8 devices
:1; /* _TZD */
162 struct acpi_thermal
{
165 unsigned long temperature
;
166 unsigned long last_temperature
;
167 unsigned long polling_frequency
;
170 struct acpi_thermal_flags flags
;
171 struct acpi_thermal_state state
;
172 struct acpi_thermal_trips trips
;
173 struct acpi_handle_list devices
;
174 struct timer_list timer
;
177 static struct file_operations acpi_thermal_state_fops
= {
178 .open
= acpi_thermal_state_open_fs
,
181 .release
= single_release
,
184 static struct file_operations acpi_thermal_temp_fops
= {
185 .open
= acpi_thermal_temp_open_fs
,
188 .release
= single_release
,
191 static struct file_operations acpi_thermal_trip_fops
= {
192 .open
= acpi_thermal_trip_open_fs
,
194 .write
= acpi_thermal_write_trip_points
,
196 .release
= single_release
,
199 static struct file_operations acpi_thermal_cooling_fops
= {
200 .open
= acpi_thermal_cooling_open_fs
,
202 .write
= acpi_thermal_write_cooling_mode
,
204 .release
= single_release
,
207 static struct file_operations acpi_thermal_polling_fops
= {
208 .open
= acpi_thermal_polling_open_fs
,
210 .write
= acpi_thermal_write_polling
,
212 .release
= single_release
,
215 /* --------------------------------------------------------------------------
216 Thermal Zone Management
217 -------------------------------------------------------------------------- */
219 static int acpi_thermal_get_temperature(struct acpi_thermal
*tz
)
221 acpi_status status
= AE_OK
;
223 ACPI_FUNCTION_TRACE("acpi_thermal_get_temperature");
226 return_VALUE(-EINVAL
);
228 tz
->last_temperature
= tz
->temperature
;
231 acpi_evaluate_integer(tz
->handle
, "_TMP", NULL
, &tz
->temperature
);
232 if (ACPI_FAILURE(status
))
233 return_VALUE(-ENODEV
);
235 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Temperature is %lu dK\n",
241 static int acpi_thermal_get_polling_frequency(struct acpi_thermal
*tz
)
243 acpi_status status
= AE_OK
;
245 ACPI_FUNCTION_TRACE("acpi_thermal_get_polling_frequency");
248 return_VALUE(-EINVAL
);
251 acpi_evaluate_integer(tz
->handle
, "_TZP", NULL
,
252 &tz
->polling_frequency
);
253 if (ACPI_FAILURE(status
))
254 return_VALUE(-ENODEV
);
256 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Polling frequency is %lu dS\n",
257 tz
->polling_frequency
));
262 static int acpi_thermal_set_polling(struct acpi_thermal
*tz
, int seconds
)
264 ACPI_FUNCTION_TRACE("acpi_thermal_set_polling");
267 return_VALUE(-EINVAL
);
269 tz
->polling_frequency
= seconds
* 10; /* Convert value to deci-seconds */
271 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
272 "Polling frequency set to %lu seconds\n",
273 tz
->polling_frequency
));
278 static int acpi_thermal_set_cooling_mode(struct acpi_thermal
*tz
, int mode
)
280 acpi_status status
= AE_OK
;
281 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
282 struct acpi_object_list arg_list
= { 1, &arg0
};
283 acpi_handle handle
= NULL
;
285 ACPI_FUNCTION_TRACE("acpi_thermal_set_cooling_mode");
288 return_VALUE(-EINVAL
);
290 status
= acpi_get_handle(tz
->handle
, "_SCP", &handle
);
291 if (ACPI_FAILURE(status
)) {
292 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "_SCP not present\n"));
293 return_VALUE(-ENODEV
);
296 arg0
.integer
.value
= mode
;
298 status
= acpi_evaluate_object(handle
, NULL
, &arg_list
, NULL
);
299 if (ACPI_FAILURE(status
))
300 return_VALUE(-ENODEV
);
302 tz
->cooling_mode
= mode
;
304 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Cooling mode [%s]\n",
305 mode
? "passive" : "active"));
310 static int acpi_thermal_get_trip_points(struct acpi_thermal
*tz
)
312 acpi_status status
= AE_OK
;
315 ACPI_FUNCTION_TRACE("acpi_thermal_get_trip_points");
318 return_VALUE(-EINVAL
);
320 /* Critical Shutdown (required) */
322 status
= acpi_evaluate_integer(tz
->handle
, "_CRT", NULL
,
323 &tz
->trips
.critical
.temperature
);
324 if (ACPI_FAILURE(status
)) {
325 tz
->trips
.critical
.flags
.valid
= 0;
326 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "No critical threshold\n"));
327 return_VALUE(-ENODEV
);
329 tz
->trips
.critical
.flags
.valid
= 1;
330 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
331 "Found critical threshold [%lu]\n",
332 tz
->trips
.critical
.temperature
));
335 /* Critical Sleep (optional) */
338 acpi_evaluate_integer(tz
->handle
, "_HOT", NULL
,
339 &tz
->trips
.hot
.temperature
);
340 if (ACPI_FAILURE(status
)) {
341 tz
->trips
.hot
.flags
.valid
= 0;
342 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No hot threshold\n"));
344 tz
->trips
.hot
.flags
.valid
= 1;
345 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found hot threshold [%lu]\n",
346 tz
->trips
.hot
.temperature
));
349 /* Passive: Processors (optional) */
352 acpi_evaluate_integer(tz
->handle
, "_PSV", NULL
,
353 &tz
->trips
.passive
.temperature
);
354 if (ACPI_FAILURE(status
)) {
355 tz
->trips
.passive
.flags
.valid
= 0;
356 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No passive threshold\n"));
358 tz
->trips
.passive
.flags
.valid
= 1;
361 acpi_evaluate_integer(tz
->handle
, "_TC1", NULL
,
362 &tz
->trips
.passive
.tc1
);
363 if (ACPI_FAILURE(status
))
364 tz
->trips
.passive
.flags
.valid
= 0;
367 acpi_evaluate_integer(tz
->handle
, "_TC2", NULL
,
368 &tz
->trips
.passive
.tc2
);
369 if (ACPI_FAILURE(status
))
370 tz
->trips
.passive
.flags
.valid
= 0;
373 acpi_evaluate_integer(tz
->handle
, "_TSP", NULL
,
374 &tz
->trips
.passive
.tsp
);
375 if (ACPI_FAILURE(status
))
376 tz
->trips
.passive
.flags
.valid
= 0;
379 acpi_evaluate_reference(tz
->handle
, "_PSL", NULL
,
380 &tz
->trips
.passive
.devices
);
381 if (ACPI_FAILURE(status
))
382 tz
->trips
.passive
.flags
.valid
= 0;
384 if (!tz
->trips
.passive
.flags
.valid
)
385 ACPI_DEBUG_PRINT((ACPI_DB_WARN
,
386 "Invalid passive threshold\n"));
388 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
389 "Found passive threshold [%lu]\n",
390 tz
->trips
.passive
.temperature
));
393 /* Active: Fans, etc. (optional) */
395 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
397 char name
[5] = { '_', 'A', 'C', ('0' + i
), '\0' };
400 acpi_evaluate_integer(tz
->handle
, name
, NULL
,
401 &tz
->trips
.active
[i
].temperature
);
402 if (ACPI_FAILURE(status
))
407 acpi_evaluate_reference(tz
->handle
, name
, NULL
,
408 &tz
->trips
.active
[i
].devices
);
409 if (ACPI_SUCCESS(status
)) {
410 tz
->trips
.active
[i
].flags
.valid
= 1;
411 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
412 "Found active threshold [%d]:[%lu]\n",
413 i
, tz
->trips
.active
[i
].temperature
));
415 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
416 "Invalid active threshold [%d]\n",
423 static int acpi_thermal_get_devices(struct acpi_thermal
*tz
)
425 acpi_status status
= AE_OK
;
427 ACPI_FUNCTION_TRACE("acpi_thermal_get_devices");
430 return_VALUE(-EINVAL
);
433 acpi_evaluate_reference(tz
->handle
, "_TZD", NULL
, &tz
->devices
);
434 if (ACPI_FAILURE(status
))
435 return_VALUE(-ENODEV
);
440 static int acpi_thermal_call_usermode(char *path
)
442 char *argv
[2] = { NULL
, NULL
};
443 char *envp
[3] = { NULL
, NULL
, NULL
};
445 ACPI_FUNCTION_TRACE("acpi_thermal_call_usermode");
448 return_VALUE(-EINVAL
);
452 /* minimal command environment */
454 envp
[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
456 call_usermodehelper(argv
[0], argv
, envp
, 0);
461 static int acpi_thermal_critical(struct acpi_thermal
*tz
)
464 struct acpi_device
*device
= NULL
;
466 ACPI_FUNCTION_TRACE("acpi_thermal_critical");
468 if (!tz
|| !tz
->trips
.critical
.flags
.valid
)
469 return_VALUE(-EINVAL
);
471 if (tz
->temperature
>= tz
->trips
.critical
.temperature
) {
472 ACPI_DEBUG_PRINT((ACPI_DB_WARN
, "Critical trip point\n"));
473 tz
->trips
.critical
.flags
.enabled
= 1;
474 } else if (tz
->trips
.critical
.flags
.enabled
)
475 tz
->trips
.critical
.flags
.enabled
= 0;
477 result
= acpi_bus_get_device(tz
->handle
, &device
);
479 return_VALUE(result
);
482 "Critical temperature reached (%ld C), shutting down.\n",
483 KELVIN_TO_CELSIUS(tz
->temperature
));
484 acpi_bus_generate_event(device
, ACPI_THERMAL_NOTIFY_CRITICAL
,
485 tz
->trips
.critical
.flags
.enabled
);
487 acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF
);
492 static int acpi_thermal_hot(struct acpi_thermal
*tz
)
495 struct acpi_device
*device
= NULL
;
497 ACPI_FUNCTION_TRACE("acpi_thermal_hot");
499 if (!tz
|| !tz
->trips
.hot
.flags
.valid
)
500 return_VALUE(-EINVAL
);
502 if (tz
->temperature
>= tz
->trips
.hot
.temperature
) {
503 ACPI_DEBUG_PRINT((ACPI_DB_WARN
, "Hot trip point\n"));
504 tz
->trips
.hot
.flags
.enabled
= 1;
505 } else if (tz
->trips
.hot
.flags
.enabled
)
506 tz
->trips
.hot
.flags
.enabled
= 0;
508 result
= acpi_bus_get_device(tz
->handle
, &device
);
510 return_VALUE(result
);
512 acpi_bus_generate_event(device
, ACPI_THERMAL_NOTIFY_HOT
,
513 tz
->trips
.hot
.flags
.enabled
);
515 /* TBD: Call user-mode "sleep(S4)" function */
520 static void acpi_thermal_passive(struct acpi_thermal
*tz
)
523 struct acpi_thermal_passive
*passive
= NULL
;
527 ACPI_FUNCTION_TRACE("acpi_thermal_passive");
529 if (!tz
|| !tz
->trips
.passive
.flags
.valid
)
532 passive
= &(tz
->trips
.passive
);
537 * Calculate the thermal trend (using the passive cooling equation)
538 * and modify the performance limit for all passive cooling devices
539 * accordingly. Note that we assume symmetry.
541 if (tz
->temperature
>= passive
->temperature
) {
543 (passive
->tc1
* (tz
->temperature
- tz
->last_temperature
)) +
544 (passive
->tc2
* (tz
->temperature
- passive
->temperature
));
545 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
546 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
547 trend
, passive
->tc1
, tz
->temperature
,
548 tz
->last_temperature
, passive
->tc2
,
549 tz
->temperature
, passive
->temperature
));
550 passive
->flags
.enabled
= 1;
553 for (i
= 0; i
< passive
->devices
.count
; i
++)
554 acpi_processor_set_thermal_limit(passive
->
557 ACPI_PROCESSOR_LIMIT_INCREMENT
);
559 else if (trend
< 0) {
560 for (i
= 0; i
< passive
->devices
.count
; i
++)
562 * assume that we are on highest
563 * freq/lowest thrott and can leave
564 * passive mode, even in error case
566 if (!acpi_processor_set_thermal_limit
567 (passive
->devices
.handles
[i
],
568 ACPI_PROCESSOR_LIMIT_DECREMENT
))
571 * Leave cooling mode, even if the temp might
572 * higher than trip point This is because some
573 * machines might have long thermal polling
574 * frequencies (tsp) defined. We will fall back
575 * into passive mode in next cycle (probably quicker)
578 passive
->flags
.enabled
= 0;
579 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
580 "Disabling passive cooling, still above threshold,"
581 " but we are cooling down\n"));
590 * Implement passive cooling hysteresis to slowly increase performance
591 * and avoid thrashing around the passive trip point. Note that we
594 if (!passive
->flags
.enabled
)
596 for (i
= 0; i
< passive
->devices
.count
; i
++)
597 if (!acpi_processor_set_thermal_limit
598 (passive
->devices
.handles
[i
],
599 ACPI_PROCESSOR_LIMIT_DECREMENT
))
602 passive
->flags
.enabled
= 0;
603 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
604 "Disabling passive cooling (zone is cool)\n"));
608 static void acpi_thermal_active(struct acpi_thermal
*tz
)
611 struct acpi_thermal_active
*active
= NULL
;
614 unsigned long maxtemp
= 0;
616 ACPI_FUNCTION_TRACE("acpi_thermal_active");
621 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
622 active
= &(tz
->trips
.active
[i
]);
623 if (!active
|| !active
->flags
.valid
)
625 if (tz
->temperature
>= active
->temperature
) {
629 * If not already enabled, turn ON all cooling devices
630 * associated with this active threshold.
632 if (active
->temperature
> maxtemp
)
633 tz
->state
.active_index
= i
;
634 maxtemp
= active
->temperature
;
635 if (active
->flags
.enabled
)
637 for (j
= 0; j
< active
->devices
.count
; j
++) {
639 acpi_bus_set_power(active
->devices
.
643 ACPI_DEBUG_PRINT((ACPI_DB_WARN
,
644 "Unable to turn cooling device [%p] 'on'\n",
649 active
->flags
.enabled
= 1;
650 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
651 "Cooling device [%p] now 'on'\n",
652 active
->devices
.handles
[j
]));
656 if (!active
->flags
.enabled
)
661 * Turn OFF all cooling devices associated with this
664 for (j
= 0; j
< active
->devices
.count
; j
++) {
665 result
= acpi_bus_set_power(active
->devices
.handles
[j
],
668 ACPI_DEBUG_PRINT((ACPI_DB_WARN
,
669 "Unable to turn cooling device [%p] 'off'\n",
670 active
->devices
.handles
[j
]));
673 active
->flags
.enabled
= 0;
674 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
675 "Cooling device [%p] now 'off'\n",
676 active
->devices
.handles
[j
]));
681 static void acpi_thermal_check(void *context
);
683 static void acpi_thermal_run(unsigned long data
)
685 struct acpi_thermal
*tz
= (struct acpi_thermal
*)data
;
687 acpi_os_execute(OSL_GPE_HANDLER
, acpi_thermal_check
, (void *)data
);
690 static void acpi_thermal_check(void *data
)
693 struct acpi_thermal
*tz
= (struct acpi_thermal
*)data
;
694 unsigned long sleep_time
= 0;
696 struct acpi_thermal_state state
;
698 ACPI_FUNCTION_TRACE("acpi_thermal_check");
701 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Invalid (NULL) context.\n"));
707 result
= acpi_thermal_get_temperature(tz
);
711 memset(&tz
->state
, 0, sizeof(tz
->state
));
716 * Compare the current temperature to the trip point values to see
717 * if we've entered one of the thermal policy states. Note that
718 * this function determines when a state is entered, but the
719 * individual policy decides when it is exited (e.g. hysteresis).
721 if (tz
->trips
.critical
.flags
.valid
)
723 (tz
->temperature
>= tz
->trips
.critical
.temperature
);
724 if (tz
->trips
.hot
.flags
.valid
)
725 state
.hot
|= (tz
->temperature
>= tz
->trips
.hot
.temperature
);
726 if (tz
->trips
.passive
.flags
.valid
)
728 (tz
->temperature
>= tz
->trips
.passive
.temperature
);
729 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
730 if (tz
->trips
.active
[i
].flags
.valid
)
733 tz
->trips
.active
[i
].temperature
);
738 * Separated from the above check to allow individual policy to
739 * determine when to exit a given state.
742 acpi_thermal_critical(tz
);
744 acpi_thermal_hot(tz
);
746 acpi_thermal_passive(tz
);
748 acpi_thermal_active(tz
);
753 * Again, separated from the above two to allow independent policy
756 tz
->state
.critical
= tz
->trips
.critical
.flags
.enabled
;
757 tz
->state
.hot
= tz
->trips
.hot
.flags
.enabled
;
758 tz
->state
.passive
= tz
->trips
.passive
.flags
.enabled
;
759 tz
->state
.active
= 0;
760 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
761 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
764 * Calculate Sleep Time
765 * --------------------
766 * If we're in the passive state, use _TSP's value. Otherwise
767 * use the default polling frequency (e.g. _TZP). If no polling
768 * frequency is specified then we'll wait forever (at least until
769 * a thermal event occurs). Note that _TSP and _TZD values are
770 * given in 1/10th seconds (we must covert to milliseconds).
772 if (tz
->state
.passive
)
773 sleep_time
= tz
->trips
.passive
.tsp
* 100;
774 else if (tz
->polling_frequency
> 0)
775 sleep_time
= tz
->polling_frequency
* 100;
777 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "%s: temperature[%lu] sleep[%lu]\n",
778 tz
->name
, tz
->temperature
, sleep_time
));
785 if (timer_pending(&(tz
->timer
)))
786 del_timer(&(tz
->timer
));
788 if (timer_pending(&(tz
->timer
)))
789 mod_timer(&(tz
->timer
), (HZ
* sleep_time
) / 1000);
791 tz
->timer
.data
= (unsigned long)tz
;
792 tz
->timer
.function
= acpi_thermal_run
;
793 tz
->timer
.expires
= jiffies
+ (HZ
* sleep_time
) / 1000;
794 add_timer(&(tz
->timer
));
801 /* --------------------------------------------------------------------------
803 -------------------------------------------------------------------------- */
805 static struct proc_dir_entry
*acpi_thermal_dir
;
807 static int acpi_thermal_state_seq_show(struct seq_file
*seq
, void *offset
)
809 struct acpi_thermal
*tz
= (struct acpi_thermal
*)seq
->private;
811 ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show");
816 seq_puts(seq
, "state: ");
818 if (!tz
->state
.critical
&& !tz
->state
.hot
&& !tz
->state
.passive
819 && !tz
->state
.active
)
820 seq_puts(seq
, "ok\n");
822 if (tz
->state
.critical
)
823 seq_puts(seq
, "critical ");
825 seq_puts(seq
, "hot ");
826 if (tz
->state
.passive
)
827 seq_puts(seq
, "passive ");
828 if (tz
->state
.active
)
829 seq_printf(seq
, "active[%d]", tz
->state
.active_index
);
837 static int acpi_thermal_state_open_fs(struct inode
*inode
, struct file
*file
)
839 return single_open(file
, acpi_thermal_state_seq_show
, PDE(inode
)->data
);
842 static int acpi_thermal_temp_seq_show(struct seq_file
*seq
, void *offset
)
845 struct acpi_thermal
*tz
= (struct acpi_thermal
*)seq
->private;
847 ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show");
852 result
= acpi_thermal_get_temperature(tz
);
856 seq_printf(seq
, "temperature: %ld C\n",
857 KELVIN_TO_CELSIUS(tz
->temperature
));
863 static int acpi_thermal_temp_open_fs(struct inode
*inode
, struct file
*file
)
865 return single_open(file
, acpi_thermal_temp_seq_show
, PDE(inode
)->data
);
868 static int acpi_thermal_trip_seq_show(struct seq_file
*seq
, void *offset
)
870 struct acpi_thermal
*tz
= (struct acpi_thermal
*)seq
->private;
874 ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show");
879 if (tz
->trips
.critical
.flags
.valid
)
880 seq_printf(seq
, "critical (S5): %ld C\n",
881 KELVIN_TO_CELSIUS(tz
->trips
.critical
.temperature
));
883 if (tz
->trips
.hot
.flags
.valid
)
884 seq_printf(seq
, "hot (S4): %ld C\n",
885 KELVIN_TO_CELSIUS(tz
->trips
.hot
.temperature
));
887 if (tz
->trips
.passive
.flags
.valid
) {
889 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
890 KELVIN_TO_CELSIUS(tz
->trips
.passive
.temperature
),
891 tz
->trips
.passive
.tc1
, tz
->trips
.passive
.tc2
,
892 tz
->trips
.passive
.tsp
);
893 for (j
= 0; j
< tz
->trips
.passive
.devices
.count
; j
++) {
895 seq_printf(seq
, "0x%p ",
896 tz
->trips
.passive
.devices
.handles
[j
]);
901 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
902 if (!(tz
->trips
.active
[i
].flags
.valid
))
904 seq_printf(seq
, "active[%d]: %ld C: devices=",
906 KELVIN_TO_CELSIUS(tz
->trips
.active
[i
].temperature
));
907 for (j
= 0; j
< tz
->trips
.active
[i
].devices
.count
; j
++)
908 seq_printf(seq
, "0x%p ",
909 tz
->trips
.active
[i
].devices
.handles
[j
]);
917 static int acpi_thermal_trip_open_fs(struct inode
*inode
, struct file
*file
)
919 return single_open(file
, acpi_thermal_trip_seq_show
, PDE(inode
)->data
);
923 acpi_thermal_write_trip_points(struct file
*file
,
924 const char __user
* buffer
,
925 size_t count
, loff_t
* ppos
)
927 struct seq_file
*m
= (struct seq_file
*)file
->private_data
;
928 struct acpi_thermal
*tz
= (struct acpi_thermal
*)m
->private;
931 int num
, critical
, hot
, passive
;
935 ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points");
937 limit_string
= kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN
, GFP_KERNEL
);
939 return_VALUE(-ENOMEM
);
941 memset(limit_string
, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN
);
943 active
= kmalloc(ACPI_THERMAL_MAX_ACTIVE
* sizeof(int), GFP_KERNEL
);
946 return_VALUE(-ENOMEM
);
949 if (!tz
|| (count
> ACPI_THERMAL_MAX_LIMIT_STR_LEN
- 1)) {
950 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Invalid argument\n"));
955 if (copy_from_user(limit_string
, buffer
, count
)) {
956 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Invalid data\n"));
961 limit_string
[count
] = '\0';
963 num
= sscanf(limit_string
, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
964 &critical
, &hot
, &passive
,
965 &active
[0], &active
[1], &active
[2], &active
[3], &active
[4],
966 &active
[5], &active
[6], &active
[7], &active
[8],
968 if (!(num
>= 5 && num
< (ACPI_THERMAL_MAX_ACTIVE
+ 3))) {
969 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
, "Invalid data format\n"));
974 tz
->trips
.critical
.temperature
= CELSIUS_TO_KELVIN(critical
);
975 tz
->trips
.hot
.temperature
= CELSIUS_TO_KELVIN(hot
);
976 tz
->trips
.passive
.temperature
= CELSIUS_TO_KELVIN(passive
);
977 for (i
= 0; i
< num
- 3; i
++) {
978 if (!(tz
->trips
.active
[i
].flags
.valid
))
980 tz
->trips
.active
[i
].temperature
= CELSIUS_TO_KELVIN(active
[i
]);
989 static int acpi_thermal_cooling_seq_show(struct seq_file
*seq
, void *offset
)
991 struct acpi_thermal
*tz
= (struct acpi_thermal
*)seq
->private;
993 ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show");
998 if (!tz
->flags
.cooling_mode
) {
999 seq_puts(seq
, "<setting not supported>\n");
1002 if (tz
->cooling_mode
== ACPI_THERMAL_MODE_CRITICAL
)
1003 seq_printf(seq
, "cooling mode: critical\n");
1005 seq_printf(seq
, "cooling mode: %s\n",
1006 tz
->cooling_mode
? "passive" : "active");
1012 static int acpi_thermal_cooling_open_fs(struct inode
*inode
, struct file
*file
)
1014 return single_open(file
, acpi_thermal_cooling_seq_show
,
1019 acpi_thermal_write_cooling_mode(struct file
*file
,
1020 const char __user
* buffer
,
1021 size_t count
, loff_t
* ppos
)
1023 struct seq_file
*m
= (struct seq_file
*)file
->private_data
;
1024 struct acpi_thermal
*tz
= (struct acpi_thermal
*)m
->private;
1026 char mode_string
[12] = { '\0' };
1028 ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode");
1030 if (!tz
|| (count
> sizeof(mode_string
) - 1))
1031 return_VALUE(-EINVAL
);
1033 if (!tz
->flags
.cooling_mode
)
1034 return_VALUE(-ENODEV
);
1036 if (copy_from_user(mode_string
, buffer
, count
))
1037 return_VALUE(-EFAULT
);
1039 mode_string
[count
] = '\0';
1041 result
= acpi_thermal_set_cooling_mode(tz
,
1042 simple_strtoul(mode_string
, NULL
,
1045 return_VALUE(result
);
1047 acpi_thermal_check(tz
);
1049 return_VALUE(count
);
1052 static int acpi_thermal_polling_seq_show(struct seq_file
*seq
, void *offset
)
1054 struct acpi_thermal
*tz
= (struct acpi_thermal
*)seq
->private;
1056 ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show");
1061 if (!tz
->polling_frequency
) {
1062 seq_puts(seq
, "<polling disabled>\n");
1066 seq_printf(seq
, "polling frequency: %lu seconds\n",
1067 (tz
->polling_frequency
/ 10));
1073 static int acpi_thermal_polling_open_fs(struct inode
*inode
, struct file
*file
)
1075 return single_open(file
, acpi_thermal_polling_seq_show
,
1080 acpi_thermal_write_polling(struct file
*file
,
1081 const char __user
* buffer
,
1082 size_t count
, loff_t
* ppos
)
1084 struct seq_file
*m
= (struct seq_file
*)file
->private_data
;
1085 struct acpi_thermal
*tz
= (struct acpi_thermal
*)m
->private;
1087 char polling_string
[12] = { '\0' };
1090 ACPI_FUNCTION_TRACE("acpi_thermal_write_polling");
1092 if (!tz
|| (count
> sizeof(polling_string
) - 1))
1093 return_VALUE(-EINVAL
);
1095 if (copy_from_user(polling_string
, buffer
, count
))
1096 return_VALUE(-EFAULT
);
1098 polling_string
[count
] = '\0';
1100 seconds
= simple_strtoul(polling_string
, NULL
, 0);
1102 result
= acpi_thermal_set_polling(tz
, seconds
);
1104 return_VALUE(result
);
1106 acpi_thermal_check(tz
);
1108 return_VALUE(count
);
1111 static int acpi_thermal_add_fs(struct acpi_device
*device
)
1113 struct proc_dir_entry
*entry
= NULL
;
1115 ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
1117 if (!acpi_device_dir(device
)) {
1118 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
1120 if (!acpi_device_dir(device
))
1121 return_VALUE(-ENODEV
);
1122 acpi_device_dir(device
)->owner
= THIS_MODULE
;
1126 entry
= create_proc_entry(ACPI_THERMAL_FILE_STATE
,
1127 S_IRUGO
, acpi_device_dir(device
));
1129 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
1130 "Unable to create '%s' fs entry\n",
1131 ACPI_THERMAL_FILE_STATE
));
1133 entry
->proc_fops
= &acpi_thermal_state_fops
;
1134 entry
->data
= acpi_driver_data(device
);
1135 entry
->owner
= THIS_MODULE
;
1138 /* 'temperature' [R] */
1139 entry
= create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE
,
1140 S_IRUGO
, acpi_device_dir(device
));
1142 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
1143 "Unable to create '%s' fs entry\n",
1144 ACPI_THERMAL_FILE_TEMPERATURE
));
1146 entry
->proc_fops
= &acpi_thermal_temp_fops
;
1147 entry
->data
= acpi_driver_data(device
);
1148 entry
->owner
= THIS_MODULE
;
1151 /* 'trip_points' [R/W] */
1152 entry
= create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS
,
1153 S_IFREG
| S_IRUGO
| S_IWUSR
,
1154 acpi_device_dir(device
));
1156 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
1157 "Unable to create '%s' fs entry\n",
1158 ACPI_THERMAL_FILE_TRIP_POINTS
));
1160 entry
->proc_fops
= &acpi_thermal_trip_fops
;
1161 entry
->data
= acpi_driver_data(device
);
1162 entry
->owner
= THIS_MODULE
;
1165 /* 'cooling_mode' [R/W] */
1166 entry
= create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE
,
1167 S_IFREG
| S_IRUGO
| S_IWUSR
,
1168 acpi_device_dir(device
));
1170 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
1171 "Unable to create '%s' fs entry\n",
1172 ACPI_THERMAL_FILE_COOLING_MODE
));
1174 entry
->proc_fops
= &acpi_thermal_cooling_fops
;
1175 entry
->data
= acpi_driver_data(device
);
1176 entry
->owner
= THIS_MODULE
;
1179 /* 'polling_frequency' [R/W] */
1180 entry
= create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ
,
1181 S_IFREG
| S_IRUGO
| S_IWUSR
,
1182 acpi_device_dir(device
));
1184 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
1185 "Unable to create '%s' fs entry\n",
1186 ACPI_THERMAL_FILE_POLLING_FREQ
));
1188 entry
->proc_fops
= &acpi_thermal_polling_fops
;
1189 entry
->data
= acpi_driver_data(device
);
1190 entry
->owner
= THIS_MODULE
;
1196 static int acpi_thermal_remove_fs(struct acpi_device
*device
)
1198 ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
1200 if (acpi_device_dir(device
)) {
1201 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ
,
1202 acpi_device_dir(device
));
1203 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE
,
1204 acpi_device_dir(device
));
1205 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS
,
1206 acpi_device_dir(device
));
1207 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE
,
1208 acpi_device_dir(device
));
1209 remove_proc_entry(ACPI_THERMAL_FILE_STATE
,
1210 acpi_device_dir(device
));
1211 remove_proc_entry(acpi_device_bid(device
), acpi_thermal_dir
);
1212 acpi_device_dir(device
) = NULL
;
1218 /* --------------------------------------------------------------------------
1220 -------------------------------------------------------------------------- */
1222 static void acpi_thermal_notify(acpi_handle handle
, u32 event
, void *data
)
1224 struct acpi_thermal
*tz
= (struct acpi_thermal
*)data
;
1225 struct acpi_device
*device
= NULL
;
1227 ACPI_FUNCTION_TRACE("acpi_thermal_notify");
1232 if (acpi_bus_get_device(tz
->handle
, &device
))
1236 case ACPI_THERMAL_NOTIFY_TEMPERATURE
:
1237 acpi_thermal_check(tz
);
1239 case ACPI_THERMAL_NOTIFY_THRESHOLDS
:
1240 acpi_thermal_get_trip_points(tz
);
1241 acpi_thermal_check(tz
);
1242 acpi_bus_generate_event(device
, event
, 0);
1244 case ACPI_THERMAL_NOTIFY_DEVICES
:
1245 if (tz
->flags
.devices
)
1246 acpi_thermal_get_devices(tz
);
1247 acpi_bus_generate_event(device
, event
, 0);
1250 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1251 "Unsupported event [0x%x]\n", event
));
1258 static int acpi_thermal_get_info(struct acpi_thermal
*tz
)
1262 ACPI_FUNCTION_TRACE("acpi_thermal_get_info");
1265 return_VALUE(-EINVAL
);
1267 /* Get temperature [_TMP] (required) */
1268 result
= acpi_thermal_get_temperature(tz
);
1270 return_VALUE(result
);
1272 /* Get trip points [_CRT, _PSV, etc.] (required) */
1273 result
= acpi_thermal_get_trip_points(tz
);
1275 return_VALUE(result
);
1277 /* Set the cooling mode [_SCP] to active cooling (default) */
1278 result
= acpi_thermal_set_cooling_mode(tz
, ACPI_THERMAL_MODE_ACTIVE
);
1280 tz
->flags
.cooling_mode
= 1;
1282 /* Oh,we have not _SCP method.
1283 Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1284 tz
->flags
.cooling_mode
= 0;
1285 if (tz
->trips
.active
[0].flags
.valid
1286 && tz
->trips
.passive
.flags
.valid
) {
1287 if (tz
->trips
.passive
.temperature
>
1288 tz
->trips
.active
[0].temperature
)
1289 tz
->cooling_mode
= ACPI_THERMAL_MODE_ACTIVE
;
1291 tz
->cooling_mode
= ACPI_THERMAL_MODE_PASSIVE
;
1292 } else if (!tz
->trips
.active
[0].flags
.valid
1293 && tz
->trips
.passive
.flags
.valid
) {
1294 tz
->cooling_mode
= ACPI_THERMAL_MODE_PASSIVE
;
1295 } else if (tz
->trips
.active
[0].flags
.valid
1296 && !tz
->trips
.passive
.flags
.valid
) {
1297 tz
->cooling_mode
= ACPI_THERMAL_MODE_ACTIVE
;
1299 /* _ACx and _PSV are optional, but _CRT is required */
1300 tz
->cooling_mode
= ACPI_THERMAL_MODE_CRITICAL
;
1304 /* Get default polling frequency [_TZP] (optional) */
1306 tz
->polling_frequency
= tzp
;
1308 acpi_thermal_get_polling_frequency(tz
);
1310 /* Get devices in this thermal zone [_TZD] (optional) */
1311 result
= acpi_thermal_get_devices(tz
);
1313 tz
->flags
.devices
= 1;
1318 static int acpi_thermal_add(struct acpi_device
*device
)
1321 acpi_status status
= AE_OK
;
1322 struct acpi_thermal
*tz
= NULL
;
1324 ACPI_FUNCTION_TRACE("acpi_thermal_add");
1327 return_VALUE(-EINVAL
);
1329 tz
= kmalloc(sizeof(struct acpi_thermal
), GFP_KERNEL
);
1331 return_VALUE(-ENOMEM
);
1332 memset(tz
, 0, sizeof(struct acpi_thermal
));
1334 tz
->handle
= device
->handle
;
1335 strcpy(tz
->name
, device
->pnp
.bus_id
);
1336 strcpy(acpi_device_name(device
), ACPI_THERMAL_DEVICE_NAME
);
1337 strcpy(acpi_device_class(device
), ACPI_THERMAL_CLASS
);
1338 acpi_driver_data(device
) = tz
;
1340 result
= acpi_thermal_get_info(tz
);
1344 result
= acpi_thermal_add_fs(device
);
1348 init_timer(&tz
->timer
);
1350 acpi_thermal_check(tz
);
1352 status
= acpi_install_notify_handler(tz
->handle
,
1354 acpi_thermal_notify
, tz
);
1355 if (ACPI_FAILURE(status
)) {
1356 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
1357 "Error installing notify handler\n"));
1362 printk(KERN_INFO PREFIX
"%s [%s] (%ld C)\n",
1363 acpi_device_name(device
), acpi_device_bid(device
),
1364 KELVIN_TO_CELSIUS(tz
->temperature
));
1368 acpi_thermal_remove_fs(device
);
1372 return_VALUE(result
);
1375 static int acpi_thermal_remove(struct acpi_device
*device
, int type
)
1377 acpi_status status
= AE_OK
;
1378 struct acpi_thermal
*tz
= NULL
;
1380 ACPI_FUNCTION_TRACE("acpi_thermal_remove");
1382 if (!device
|| !acpi_driver_data(device
))
1383 return_VALUE(-EINVAL
);
1385 tz
= (struct acpi_thermal
*)acpi_driver_data(device
);
1387 /* avoid timer adding new defer task */
1389 /* wait for running timer (on other CPUs) finish */
1390 del_timer_sync(&(tz
->timer
));
1391 /* synchronize deferred task */
1392 acpi_os_wait_events_complete(NULL
);
1393 /* deferred task may reinsert timer */
1394 del_timer_sync(&(tz
->timer
));
1396 status
= acpi_remove_notify_handler(tz
->handle
,
1398 acpi_thermal_notify
);
1399 if (ACPI_FAILURE(status
))
1400 ACPI_DEBUG_PRINT((ACPI_DB_ERROR
,
1401 "Error removing notify handler\n"));
1403 /* Terminate policy */
1404 if (tz
->trips
.passive
.flags
.valid
&& tz
->trips
.passive
.flags
.enabled
) {
1405 tz
->trips
.passive
.flags
.enabled
= 0;
1406 acpi_thermal_passive(tz
);
1408 if (tz
->trips
.active
[0].flags
.valid
1409 && tz
->trips
.active
[0].flags
.enabled
) {
1410 tz
->trips
.active
[0].flags
.enabled
= 0;
1411 acpi_thermal_active(tz
);
1414 acpi_thermal_remove_fs(device
);
1420 static int __init
acpi_thermal_init(void)
1424 ACPI_FUNCTION_TRACE("acpi_thermal_init");
1426 acpi_thermal_dir
= proc_mkdir(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1427 if (!acpi_thermal_dir
)
1428 return_VALUE(-ENODEV
);
1429 acpi_thermal_dir
->owner
= THIS_MODULE
;
1431 result
= acpi_bus_register_driver(&acpi_thermal_driver
);
1433 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1434 return_VALUE(-ENODEV
);
1440 static void __exit
acpi_thermal_exit(void)
1442 ACPI_FUNCTION_TRACE("acpi_thermal_exit");
1444 acpi_bus_unregister_driver(&acpi_thermal_driver
);
1446 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1451 module_init(acpi_thermal_init
);
1452 module_exit(acpi_thermal_exit
);