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/timer.h>
40 #include <linux/jiffies.h>
41 #include <linux/kmod.h>
42 #include <linux/seq_file.h>
43 #include <asm/uaccess.h>
45 #include <acpi/acpi_bus.h>
46 #include <acpi/acpi_drivers.h>
48 #define ACPI_THERMAL_COMPONENT 0x04000000
49 #define ACPI_THERMAL_CLASS "thermal_zone"
50 #define ACPI_THERMAL_DRIVER_NAME "ACPI Thermal Zone Driver"
51 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
52 #define ACPI_THERMAL_FILE_STATE "state"
53 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
54 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
55 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
56 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
57 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
58 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
59 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82
60 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
61 #define ACPI_THERMAL_NOTIFY_HOT 0xF1
62 #define ACPI_THERMAL_MODE_ACTIVE 0x00
63 #define ACPI_THERMAL_MODE_PASSIVE 0x01
64 #define ACPI_THERMAL_MODE_CRITICAL 0xff
65 #define ACPI_THERMAL_PATH_POWEROFF "/sbin/poweroff"
67 #define ACPI_THERMAL_MAX_ACTIVE 10
68 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
70 #define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
71 #define CELSIUS_TO_KELVIN(t) ((t+273)*10)
73 #define _COMPONENT ACPI_THERMAL_COMPONENT
74 ACPI_MODULE_NAME("acpi_thermal")
76 MODULE_AUTHOR("Paul Diefenbaugh");
77 MODULE_DESCRIPTION(ACPI_THERMAL_DRIVER_NAME
);
78 MODULE_LICENSE("GPL");
81 module_param(tzp
, int, 0);
82 MODULE_PARM_DESC(tzp
, "Thermal zone polling frequency, in 1/10 seconds.\n");
84 static int acpi_thermal_add(struct acpi_device
*device
);
85 static int acpi_thermal_remove(struct acpi_device
*device
, int type
);
86 static int acpi_thermal_resume(struct acpi_device
*device
);
87 static int acpi_thermal_state_open_fs(struct inode
*inode
, struct file
*file
);
88 static int acpi_thermal_temp_open_fs(struct inode
*inode
, struct file
*file
);
89 static int acpi_thermal_trip_open_fs(struct inode
*inode
, struct file
*file
);
90 static ssize_t
acpi_thermal_write_trip_points(struct file
*,
91 const char __user
*, size_t,
93 static int acpi_thermal_cooling_open_fs(struct inode
*inode
, struct file
*file
);
94 static ssize_t
acpi_thermal_write_cooling_mode(struct file
*,
95 const char __user
*, size_t,
97 static int acpi_thermal_polling_open_fs(struct inode
*inode
, struct file
*file
);
98 static ssize_t
acpi_thermal_write_polling(struct file
*, const char __user
*,
101 static struct acpi_driver acpi_thermal_driver
= {
102 .name
= ACPI_THERMAL_DRIVER_NAME
,
103 .class = ACPI_THERMAL_CLASS
,
104 .ids
= ACPI_THERMAL_HID
,
106 .add
= acpi_thermal_add
,
107 .remove
= acpi_thermal_remove
,
108 .resume
= acpi_thermal_resume
,
112 struct acpi_thermal_state
{
121 struct acpi_thermal_state_flags
{
127 struct acpi_thermal_critical
{
128 struct acpi_thermal_state_flags flags
;
129 unsigned long temperature
;
132 struct acpi_thermal_hot
{
133 struct acpi_thermal_state_flags flags
;
134 unsigned long temperature
;
137 struct acpi_thermal_passive
{
138 struct acpi_thermal_state_flags flags
;
139 unsigned long temperature
;
143 struct acpi_handle_list devices
;
146 struct acpi_thermal_active
{
147 struct acpi_thermal_state_flags flags
;
148 unsigned long temperature
;
149 struct acpi_handle_list devices
;
152 struct acpi_thermal_trips
{
153 struct acpi_thermal_critical critical
;
154 struct acpi_thermal_hot hot
;
155 struct acpi_thermal_passive passive
;
156 struct acpi_thermal_active active
[ACPI_THERMAL_MAX_ACTIVE
];
159 struct acpi_thermal_flags
{
160 u8 cooling_mode
:1; /* _SCP */
161 u8 devices
:1; /* _TZD */
165 struct acpi_thermal
{
166 struct acpi_device
* device
;
168 unsigned long temperature
;
169 unsigned long last_temperature
;
170 unsigned long polling_frequency
;
173 struct acpi_thermal_flags flags
;
174 struct acpi_thermal_state state
;
175 struct acpi_thermal_trips trips
;
176 struct acpi_handle_list devices
;
177 struct timer_list timer
;
180 static const struct file_operations acpi_thermal_state_fops
= {
181 .open
= acpi_thermal_state_open_fs
,
184 .release
= single_release
,
187 static const struct file_operations acpi_thermal_temp_fops
= {
188 .open
= acpi_thermal_temp_open_fs
,
191 .release
= single_release
,
194 static const struct file_operations acpi_thermal_trip_fops
= {
195 .open
= acpi_thermal_trip_open_fs
,
197 .write
= acpi_thermal_write_trip_points
,
199 .release
= single_release
,
202 static const struct file_operations acpi_thermal_cooling_fops
= {
203 .open
= acpi_thermal_cooling_open_fs
,
205 .write
= acpi_thermal_write_cooling_mode
,
207 .release
= single_release
,
210 static const struct file_operations acpi_thermal_polling_fops
= {
211 .open
= acpi_thermal_polling_open_fs
,
213 .write
= acpi_thermal_write_polling
,
215 .release
= single_release
,
218 /* --------------------------------------------------------------------------
219 Thermal Zone Management
220 -------------------------------------------------------------------------- */
222 static int acpi_thermal_get_temperature(struct acpi_thermal
*tz
)
224 acpi_status status
= AE_OK
;
230 tz
->last_temperature
= tz
->temperature
;
233 acpi_evaluate_integer(tz
->device
->handle
, "_TMP", NULL
, &tz
->temperature
);
234 if (ACPI_FAILURE(status
))
237 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Temperature is %lu dK\n",
243 static int acpi_thermal_get_polling_frequency(struct acpi_thermal
*tz
)
245 acpi_status status
= AE_OK
;
252 acpi_evaluate_integer(tz
->device
->handle
, "_TZP", NULL
,
253 &tz
->polling_frequency
);
254 if (ACPI_FAILURE(status
))
257 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Polling frequency is %lu dS\n",
258 tz
->polling_frequency
));
263 static int acpi_thermal_set_polling(struct acpi_thermal
*tz
, int seconds
)
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
;
289 status
= acpi_get_handle(tz
->device
->handle
, "_SCP", &handle
);
290 if (ACPI_FAILURE(status
)) {
291 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "_SCP not present\n"));
295 arg0
.integer
.value
= mode
;
297 status
= acpi_evaluate_object(handle
, NULL
, &arg_list
, NULL
);
298 if (ACPI_FAILURE(status
))
301 tz
->cooling_mode
= mode
;
303 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Cooling mode [%s]\n",
304 mode
? "passive" : "active"));
309 static int acpi_thermal_get_trip_points(struct acpi_thermal
*tz
)
311 acpi_status status
= AE_OK
;
318 /* Critical Shutdown (required) */
320 status
= acpi_evaluate_integer(tz
->device
->handle
, "_CRT", NULL
,
321 &tz
->trips
.critical
.temperature
);
322 if (ACPI_FAILURE(status
)) {
323 tz
->trips
.critical
.flags
.valid
= 0;
324 ACPI_EXCEPTION((AE_INFO
, status
, "No critical threshold"));
327 tz
->trips
.critical
.flags
.valid
= 1;
328 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
329 "Found critical threshold [%lu]\n",
330 tz
->trips
.critical
.temperature
));
333 /* Critical Sleep (optional) */
336 acpi_evaluate_integer(tz
->device
->handle
, "_HOT", NULL
,
337 &tz
->trips
.hot
.temperature
);
338 if (ACPI_FAILURE(status
)) {
339 tz
->trips
.hot
.flags
.valid
= 0;
340 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No hot threshold\n"));
342 tz
->trips
.hot
.flags
.valid
= 1;
343 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found hot threshold [%lu]\n",
344 tz
->trips
.hot
.temperature
));
347 /* Passive: Processors (optional) */
350 acpi_evaluate_integer(tz
->device
->handle
, "_PSV", NULL
,
351 &tz
->trips
.passive
.temperature
);
352 if (ACPI_FAILURE(status
)) {
353 tz
->trips
.passive
.flags
.valid
= 0;
354 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No passive threshold\n"));
356 tz
->trips
.passive
.flags
.valid
= 1;
359 acpi_evaluate_integer(tz
->device
->handle
, "_TC1", NULL
,
360 &tz
->trips
.passive
.tc1
);
361 if (ACPI_FAILURE(status
))
362 tz
->trips
.passive
.flags
.valid
= 0;
365 acpi_evaluate_integer(tz
->device
->handle
, "_TC2", NULL
,
366 &tz
->trips
.passive
.tc2
);
367 if (ACPI_FAILURE(status
))
368 tz
->trips
.passive
.flags
.valid
= 0;
371 acpi_evaluate_integer(tz
->device
->handle
, "_TSP", NULL
,
372 &tz
->trips
.passive
.tsp
);
373 if (ACPI_FAILURE(status
))
374 tz
->trips
.passive
.flags
.valid
= 0;
377 acpi_evaluate_reference(tz
->device
->handle
, "_PSL", NULL
,
378 &tz
->trips
.passive
.devices
);
379 if (ACPI_FAILURE(status
))
380 tz
->trips
.passive
.flags
.valid
= 0;
382 if (!tz
->trips
.passive
.flags
.valid
)
383 printk(KERN_WARNING PREFIX
"Invalid passive threshold\n");
385 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
386 "Found passive threshold [%lu]\n",
387 tz
->trips
.passive
.temperature
));
390 /* Active: Fans, etc. (optional) */
392 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
394 char name
[5] = { '_', 'A', 'C', ('0' + i
), '\0' };
397 acpi_evaluate_integer(tz
->device
->handle
, name
, NULL
,
398 &tz
->trips
.active
[i
].temperature
);
399 if (ACPI_FAILURE(status
))
404 acpi_evaluate_reference(tz
->device
->handle
, name
, NULL
,
405 &tz
->trips
.active
[i
].devices
);
406 if (ACPI_SUCCESS(status
)) {
407 tz
->trips
.active
[i
].flags
.valid
= 1;
408 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
409 "Found active threshold [%d]:[%lu]\n",
410 i
, tz
->trips
.active
[i
].temperature
));
412 ACPI_EXCEPTION((AE_INFO
, status
,
413 "Invalid active threshold [%d]", i
));
419 static int acpi_thermal_get_devices(struct acpi_thermal
*tz
)
421 acpi_status status
= AE_OK
;
428 acpi_evaluate_reference(tz
->device
->handle
, "_TZD", NULL
, &tz
->devices
);
429 if (ACPI_FAILURE(status
))
435 static int acpi_thermal_call_usermode(char *path
)
437 char *argv
[2] = { NULL
, NULL
};
438 char *envp
[3] = { NULL
, NULL
, NULL
};
446 /* minimal command environment */
448 envp
[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
450 call_usermodehelper(argv
[0], argv
, envp
, 0);
455 static int acpi_thermal_critical(struct acpi_thermal
*tz
)
457 if (!tz
|| !tz
->trips
.critical
.flags
.valid
)
460 if (tz
->temperature
>= tz
->trips
.critical
.temperature
) {
461 printk(KERN_WARNING PREFIX
"Critical trip point\n");
462 tz
->trips
.critical
.flags
.enabled
= 1;
463 } else if (tz
->trips
.critical
.flags
.enabled
)
464 tz
->trips
.critical
.flags
.enabled
= 0;
467 "Critical temperature reached (%ld C), shutting down.\n",
468 KELVIN_TO_CELSIUS(tz
->temperature
));
469 acpi_bus_generate_event(tz
->device
, ACPI_THERMAL_NOTIFY_CRITICAL
,
470 tz
->trips
.critical
.flags
.enabled
);
472 acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF
);
477 static int acpi_thermal_hot(struct acpi_thermal
*tz
)
479 if (!tz
|| !tz
->trips
.hot
.flags
.valid
)
482 if (tz
->temperature
>= tz
->trips
.hot
.temperature
) {
483 printk(KERN_WARNING PREFIX
"Hot trip point\n");
484 tz
->trips
.hot
.flags
.enabled
= 1;
485 } else if (tz
->trips
.hot
.flags
.enabled
)
486 tz
->trips
.hot
.flags
.enabled
= 0;
488 acpi_bus_generate_event(tz
->device
, ACPI_THERMAL_NOTIFY_HOT
,
489 tz
->trips
.hot
.flags
.enabled
);
491 /* TBD: Call user-mode "sleep(S4)" function */
496 static void acpi_thermal_passive(struct acpi_thermal
*tz
)
499 struct acpi_thermal_passive
*passive
= NULL
;
504 if (!tz
|| !tz
->trips
.passive
.flags
.valid
)
507 passive
= &(tz
->trips
.passive
);
512 * Calculate the thermal trend (using the passive cooling equation)
513 * and modify the performance limit for all passive cooling devices
514 * accordingly. Note that we assume symmetry.
516 if (tz
->temperature
>= passive
->temperature
) {
518 (passive
->tc1
* (tz
->temperature
- tz
->last_temperature
)) +
519 (passive
->tc2
* (tz
->temperature
- passive
->temperature
));
520 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
521 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
522 trend
, passive
->tc1
, tz
->temperature
,
523 tz
->last_temperature
, passive
->tc2
,
524 tz
->temperature
, passive
->temperature
));
525 passive
->flags
.enabled
= 1;
528 for (i
= 0; i
< passive
->devices
.count
; i
++)
529 acpi_processor_set_thermal_limit(passive
->
532 ACPI_PROCESSOR_LIMIT_INCREMENT
);
534 else if (trend
< 0) {
535 for (i
= 0; i
< passive
->devices
.count
; i
++)
537 * assume that we are on highest
538 * freq/lowest thrott and can leave
539 * passive mode, even in error case
541 if (!acpi_processor_set_thermal_limit
542 (passive
->devices
.handles
[i
],
543 ACPI_PROCESSOR_LIMIT_DECREMENT
))
546 * Leave cooling mode, even if the temp might
547 * higher than trip point This is because some
548 * machines might have long thermal polling
549 * frequencies (tsp) defined. We will fall back
550 * into passive mode in next cycle (probably quicker)
553 passive
->flags
.enabled
= 0;
554 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
555 "Disabling passive cooling, still above threshold,"
556 " but we are cooling down\n"));
565 * Implement passive cooling hysteresis to slowly increase performance
566 * and avoid thrashing around the passive trip point. Note that we
569 if (!passive
->flags
.enabled
)
571 for (i
= 0; i
< passive
->devices
.count
; i
++)
572 if (!acpi_processor_set_thermal_limit
573 (passive
->devices
.handles
[i
],
574 ACPI_PROCESSOR_LIMIT_DECREMENT
))
577 passive
->flags
.enabled
= 0;
578 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
579 "Disabling passive cooling (zone is cool)\n"));
583 static void acpi_thermal_active(struct acpi_thermal
*tz
)
586 struct acpi_thermal_active
*active
= NULL
;
589 unsigned long maxtemp
= 0;
595 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
596 active
= &(tz
->trips
.active
[i
]);
597 if (!active
|| !active
->flags
.valid
)
599 if (tz
->temperature
>= active
->temperature
) {
603 * If not already enabled, turn ON all cooling devices
604 * associated with this active threshold.
606 if (active
->temperature
> maxtemp
)
607 tz
->state
.active_index
= i
;
608 maxtemp
= active
->temperature
;
609 if (active
->flags
.enabled
)
611 for (j
= 0; j
< active
->devices
.count
; j
++) {
613 acpi_bus_set_power(active
->devices
.
617 printk(KERN_WARNING PREFIX
618 "Unable to turn cooling device [%p] 'on'\n",
623 active
->flags
.enabled
= 1;
624 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
625 "Cooling device [%p] now 'on'\n",
626 active
->devices
.handles
[j
]));
630 if (!active
->flags
.enabled
)
635 * Turn OFF all cooling devices associated with this
638 for (j
= 0; j
< active
->devices
.count
; j
++) {
639 result
= acpi_bus_set_power(active
->devices
.handles
[j
],
642 printk(KERN_WARNING PREFIX
643 "Unable to turn cooling device [%p] 'off'\n",
644 active
->devices
.handles
[j
]);
647 active
->flags
.enabled
= 0;
648 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
649 "Cooling device [%p] now 'off'\n",
650 active
->devices
.handles
[j
]));
655 static void acpi_thermal_check(void *context
);
657 static void acpi_thermal_run(unsigned long data
)
659 struct acpi_thermal
*tz
= (struct acpi_thermal
*)data
;
661 acpi_os_execute(OSL_GPE_HANDLER
, acpi_thermal_check
, (void *)data
);
664 static void acpi_thermal_check(void *data
)
667 struct acpi_thermal
*tz
= data
;
668 unsigned long sleep_time
= 0;
670 struct acpi_thermal_state state
;
674 printk(KERN_ERR PREFIX
"Invalid (NULL) context\n");
680 result
= acpi_thermal_get_temperature(tz
);
684 memset(&tz
->state
, 0, sizeof(tz
->state
));
689 * Compare the current temperature to the trip point values to see
690 * if we've entered one of the thermal policy states. Note that
691 * this function determines when a state is entered, but the
692 * individual policy decides when it is exited (e.g. hysteresis).
694 if (tz
->trips
.critical
.flags
.valid
)
696 (tz
->temperature
>= tz
->trips
.critical
.temperature
);
697 if (tz
->trips
.hot
.flags
.valid
)
698 state
.hot
|= (tz
->temperature
>= tz
->trips
.hot
.temperature
);
699 if (tz
->trips
.passive
.flags
.valid
)
701 (tz
->temperature
>= tz
->trips
.passive
.temperature
);
702 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
703 if (tz
->trips
.active
[i
].flags
.valid
)
706 tz
->trips
.active
[i
].temperature
);
711 * Separated from the above check to allow individual policy to
712 * determine when to exit a given state.
715 acpi_thermal_critical(tz
);
717 acpi_thermal_hot(tz
);
719 acpi_thermal_passive(tz
);
721 acpi_thermal_active(tz
);
726 * Again, separated from the above two to allow independent policy
729 tz
->state
.critical
= tz
->trips
.critical
.flags
.enabled
;
730 tz
->state
.hot
= tz
->trips
.hot
.flags
.enabled
;
731 tz
->state
.passive
= tz
->trips
.passive
.flags
.enabled
;
732 tz
->state
.active
= 0;
733 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
734 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
737 * Calculate Sleep Time
738 * --------------------
739 * If we're in the passive state, use _TSP's value. Otherwise
740 * use the default polling frequency (e.g. _TZP). If no polling
741 * frequency is specified then we'll wait forever (at least until
742 * a thermal event occurs). Note that _TSP and _TZD values are
743 * given in 1/10th seconds (we must covert to milliseconds).
745 if (tz
->state
.passive
)
746 sleep_time
= tz
->trips
.passive
.tsp
* 100;
747 else if (tz
->polling_frequency
> 0)
748 sleep_time
= tz
->polling_frequency
* 100;
750 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "%s: temperature[%lu] sleep[%lu]\n",
751 tz
->name
, tz
->temperature
, sleep_time
));
758 if (timer_pending(&(tz
->timer
)))
759 del_timer(&(tz
->timer
));
761 if (timer_pending(&(tz
->timer
)))
762 mod_timer(&(tz
->timer
), (HZ
* sleep_time
) / 1000);
764 tz
->timer
.data
= (unsigned long)tz
;
765 tz
->timer
.function
= acpi_thermal_run
;
766 tz
->timer
.expires
= jiffies
+ (HZ
* sleep_time
) / 1000;
767 add_timer(&(tz
->timer
));
774 /* --------------------------------------------------------------------------
776 -------------------------------------------------------------------------- */
778 static struct proc_dir_entry
*acpi_thermal_dir
;
780 static int acpi_thermal_state_seq_show(struct seq_file
*seq
, void *offset
)
782 struct acpi_thermal
*tz
= seq
->private;
788 seq_puts(seq
, "state: ");
790 if (!tz
->state
.critical
&& !tz
->state
.hot
&& !tz
->state
.passive
791 && !tz
->state
.active
)
792 seq_puts(seq
, "ok\n");
794 if (tz
->state
.critical
)
795 seq_puts(seq
, "critical ");
797 seq_puts(seq
, "hot ");
798 if (tz
->state
.passive
)
799 seq_puts(seq
, "passive ");
800 if (tz
->state
.active
)
801 seq_printf(seq
, "active[%d]", tz
->state
.active_index
);
809 static int acpi_thermal_state_open_fs(struct inode
*inode
, struct file
*file
)
811 return single_open(file
, acpi_thermal_state_seq_show
, PDE(inode
)->data
);
814 static int acpi_thermal_temp_seq_show(struct seq_file
*seq
, void *offset
)
817 struct acpi_thermal
*tz
= seq
->private;
823 result
= acpi_thermal_get_temperature(tz
);
827 seq_printf(seq
, "temperature: %ld C\n",
828 KELVIN_TO_CELSIUS(tz
->temperature
));
834 static int acpi_thermal_temp_open_fs(struct inode
*inode
, struct file
*file
)
836 return single_open(file
, acpi_thermal_temp_seq_show
, PDE(inode
)->data
);
839 static int acpi_thermal_trip_seq_show(struct seq_file
*seq
, void *offset
)
841 struct acpi_thermal
*tz
= seq
->private;
849 if (tz
->trips
.critical
.flags
.valid
)
850 seq_printf(seq
, "critical (S5): %ld C\n",
851 KELVIN_TO_CELSIUS(tz
->trips
.critical
.temperature
));
853 if (tz
->trips
.hot
.flags
.valid
)
854 seq_printf(seq
, "hot (S4): %ld C\n",
855 KELVIN_TO_CELSIUS(tz
->trips
.hot
.temperature
));
857 if (tz
->trips
.passive
.flags
.valid
) {
859 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
860 KELVIN_TO_CELSIUS(tz
->trips
.passive
.temperature
),
861 tz
->trips
.passive
.tc1
, tz
->trips
.passive
.tc2
,
862 tz
->trips
.passive
.tsp
);
863 for (j
= 0; j
< tz
->trips
.passive
.devices
.count
; j
++) {
865 seq_printf(seq
, "0x%p ",
866 tz
->trips
.passive
.devices
.handles
[j
]);
871 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
872 if (!(tz
->trips
.active
[i
].flags
.valid
))
874 seq_printf(seq
, "active[%d]: %ld C: devices=",
876 KELVIN_TO_CELSIUS(tz
->trips
.active
[i
].temperature
));
877 for (j
= 0; j
< tz
->trips
.active
[i
].devices
.count
; j
++)
878 seq_printf(seq
, "0x%p ",
879 tz
->trips
.active
[i
].devices
.handles
[j
]);
887 static int acpi_thermal_trip_open_fs(struct inode
*inode
, struct file
*file
)
889 return single_open(file
, acpi_thermal_trip_seq_show
, PDE(inode
)->data
);
893 acpi_thermal_write_trip_points(struct file
*file
,
894 const char __user
* buffer
,
895 size_t count
, loff_t
* ppos
)
897 struct seq_file
*m
= file
->private_data
;
898 struct acpi_thermal
*tz
= m
->private;
901 int num
, critical
, hot
, passive
;
906 limit_string
= kzalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN
, GFP_KERNEL
);
910 active
= kmalloc(ACPI_THERMAL_MAX_ACTIVE
* sizeof(int), GFP_KERNEL
);
916 if (!tz
|| (count
> ACPI_THERMAL_MAX_LIMIT_STR_LEN
- 1)) {
921 if (copy_from_user(limit_string
, buffer
, count
)) {
926 limit_string
[count
] = '\0';
928 num
= sscanf(limit_string
, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
929 &critical
, &hot
, &passive
,
930 &active
[0], &active
[1], &active
[2], &active
[3], &active
[4],
931 &active
[5], &active
[6], &active
[7], &active
[8],
933 if (!(num
>= 5 && num
< (ACPI_THERMAL_MAX_ACTIVE
+ 3))) {
938 tz
->trips
.critical
.temperature
= CELSIUS_TO_KELVIN(critical
);
939 tz
->trips
.hot
.temperature
= CELSIUS_TO_KELVIN(hot
);
940 tz
->trips
.passive
.temperature
= CELSIUS_TO_KELVIN(passive
);
941 for (i
= 0; i
< num
- 3; i
++) {
942 if (!(tz
->trips
.active
[i
].flags
.valid
))
944 tz
->trips
.active
[i
].temperature
= CELSIUS_TO_KELVIN(active
[i
]);
953 static int acpi_thermal_cooling_seq_show(struct seq_file
*seq
, void *offset
)
955 struct acpi_thermal
*tz
= seq
->private;
961 if (!tz
->flags
.cooling_mode
) {
962 seq_puts(seq
, "<setting not supported>\n");
965 if (tz
->cooling_mode
== ACPI_THERMAL_MODE_CRITICAL
)
966 seq_printf(seq
, "cooling mode: critical\n");
968 seq_printf(seq
, "cooling mode: %s\n",
969 tz
->cooling_mode
? "passive" : "active");
975 static int acpi_thermal_cooling_open_fs(struct inode
*inode
, struct file
*file
)
977 return single_open(file
, acpi_thermal_cooling_seq_show
,
982 acpi_thermal_write_cooling_mode(struct file
*file
,
983 const char __user
* buffer
,
984 size_t count
, loff_t
* ppos
)
986 struct seq_file
*m
= file
->private_data
;
987 struct acpi_thermal
*tz
= m
->private;
989 char mode_string
[12] = { '\0' };
992 if (!tz
|| (count
> sizeof(mode_string
) - 1))
995 if (!tz
->flags
.cooling_mode
)
998 if (copy_from_user(mode_string
, buffer
, count
))
1001 mode_string
[count
] = '\0';
1003 result
= acpi_thermal_set_cooling_mode(tz
,
1004 simple_strtoul(mode_string
, NULL
,
1009 acpi_thermal_check(tz
);
1014 static int acpi_thermal_polling_seq_show(struct seq_file
*seq
, void *offset
)
1016 struct acpi_thermal
*tz
= seq
->private;
1022 if (!tz
->polling_frequency
) {
1023 seq_puts(seq
, "<polling disabled>\n");
1027 seq_printf(seq
, "polling frequency: %lu seconds\n",
1028 (tz
->polling_frequency
/ 10));
1034 static int acpi_thermal_polling_open_fs(struct inode
*inode
, struct file
*file
)
1036 return single_open(file
, acpi_thermal_polling_seq_show
,
1041 acpi_thermal_write_polling(struct file
*file
,
1042 const char __user
* buffer
,
1043 size_t count
, loff_t
* ppos
)
1045 struct seq_file
*m
= file
->private_data
;
1046 struct acpi_thermal
*tz
= m
->private;
1048 char polling_string
[12] = { '\0' };
1052 if (!tz
|| (count
> sizeof(polling_string
) - 1))
1055 if (copy_from_user(polling_string
, buffer
, count
))
1058 polling_string
[count
] = '\0';
1060 seconds
= simple_strtoul(polling_string
, NULL
, 0);
1062 result
= acpi_thermal_set_polling(tz
, seconds
);
1066 acpi_thermal_check(tz
);
1071 static int acpi_thermal_add_fs(struct acpi_device
*device
)
1073 struct proc_dir_entry
*entry
= NULL
;
1076 if (!acpi_device_dir(device
)) {
1077 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
1079 if (!acpi_device_dir(device
))
1081 acpi_device_dir(device
)->owner
= THIS_MODULE
;
1085 entry
= create_proc_entry(ACPI_THERMAL_FILE_STATE
,
1086 S_IRUGO
, acpi_device_dir(device
));
1090 entry
->proc_fops
= &acpi_thermal_state_fops
;
1091 entry
->data
= acpi_driver_data(device
);
1092 entry
->owner
= THIS_MODULE
;
1095 /* 'temperature' [R] */
1096 entry
= create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE
,
1097 S_IRUGO
, acpi_device_dir(device
));
1101 entry
->proc_fops
= &acpi_thermal_temp_fops
;
1102 entry
->data
= acpi_driver_data(device
);
1103 entry
->owner
= THIS_MODULE
;
1106 /* 'trip_points' [R/W] */
1107 entry
= create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS
,
1108 S_IFREG
| S_IRUGO
| S_IWUSR
,
1109 acpi_device_dir(device
));
1113 entry
->proc_fops
= &acpi_thermal_trip_fops
;
1114 entry
->data
= acpi_driver_data(device
);
1115 entry
->owner
= THIS_MODULE
;
1118 /* 'cooling_mode' [R/W] */
1119 entry
= create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE
,
1120 S_IFREG
| S_IRUGO
| S_IWUSR
,
1121 acpi_device_dir(device
));
1125 entry
->proc_fops
= &acpi_thermal_cooling_fops
;
1126 entry
->data
= acpi_driver_data(device
);
1127 entry
->owner
= THIS_MODULE
;
1130 /* 'polling_frequency' [R/W] */
1131 entry
= create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ
,
1132 S_IFREG
| S_IRUGO
| S_IWUSR
,
1133 acpi_device_dir(device
));
1137 entry
->proc_fops
= &acpi_thermal_polling_fops
;
1138 entry
->data
= acpi_driver_data(device
);
1139 entry
->owner
= THIS_MODULE
;
1145 static int acpi_thermal_remove_fs(struct acpi_device
*device
)
1148 if (acpi_device_dir(device
)) {
1149 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ
,
1150 acpi_device_dir(device
));
1151 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE
,
1152 acpi_device_dir(device
));
1153 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS
,
1154 acpi_device_dir(device
));
1155 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE
,
1156 acpi_device_dir(device
));
1157 remove_proc_entry(ACPI_THERMAL_FILE_STATE
,
1158 acpi_device_dir(device
));
1159 remove_proc_entry(acpi_device_bid(device
), acpi_thermal_dir
);
1160 acpi_device_dir(device
) = NULL
;
1166 /* --------------------------------------------------------------------------
1168 -------------------------------------------------------------------------- */
1170 static void acpi_thermal_notify(acpi_handle handle
, u32 event
, void *data
)
1172 struct acpi_thermal
*tz
= data
;
1173 struct acpi_device
*device
= NULL
;
1179 device
= tz
->device
;
1182 case ACPI_THERMAL_NOTIFY_TEMPERATURE
:
1183 acpi_thermal_check(tz
);
1185 case ACPI_THERMAL_NOTIFY_THRESHOLDS
:
1186 acpi_thermal_get_trip_points(tz
);
1187 acpi_thermal_check(tz
);
1188 acpi_bus_generate_event(device
, event
, 0);
1190 case ACPI_THERMAL_NOTIFY_DEVICES
:
1191 if (tz
->flags
.devices
)
1192 acpi_thermal_get_devices(tz
);
1193 acpi_bus_generate_event(device
, event
, 0);
1196 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1197 "Unsupported event [0x%x]\n", event
));
1204 static int acpi_thermal_get_info(struct acpi_thermal
*tz
)
1212 /* Get temperature [_TMP] (required) */
1213 result
= acpi_thermal_get_temperature(tz
);
1217 /* Get trip points [_CRT, _PSV, etc.] (required) */
1218 result
= acpi_thermal_get_trip_points(tz
);
1222 /* Set the cooling mode [_SCP] to active cooling (default) */
1223 result
= acpi_thermal_set_cooling_mode(tz
, ACPI_THERMAL_MODE_ACTIVE
);
1225 tz
->flags
.cooling_mode
= 1;
1227 /* Oh,we have not _SCP method.
1228 Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1229 tz
->flags
.cooling_mode
= 0;
1230 if (tz
->trips
.active
[0].flags
.valid
1231 && tz
->trips
.passive
.flags
.valid
) {
1232 if (tz
->trips
.passive
.temperature
>
1233 tz
->trips
.active
[0].temperature
)
1234 tz
->cooling_mode
= ACPI_THERMAL_MODE_ACTIVE
;
1236 tz
->cooling_mode
= ACPI_THERMAL_MODE_PASSIVE
;
1237 } else if (!tz
->trips
.active
[0].flags
.valid
1238 && tz
->trips
.passive
.flags
.valid
) {
1239 tz
->cooling_mode
= ACPI_THERMAL_MODE_PASSIVE
;
1240 } else if (tz
->trips
.active
[0].flags
.valid
1241 && !tz
->trips
.passive
.flags
.valid
) {
1242 tz
->cooling_mode
= ACPI_THERMAL_MODE_ACTIVE
;
1244 /* _ACx and _PSV are optional, but _CRT is required */
1245 tz
->cooling_mode
= ACPI_THERMAL_MODE_CRITICAL
;
1249 /* Get default polling frequency [_TZP] (optional) */
1251 tz
->polling_frequency
= tzp
;
1253 acpi_thermal_get_polling_frequency(tz
);
1255 /* Get devices in this thermal zone [_TZD] (optional) */
1256 result
= acpi_thermal_get_devices(tz
);
1258 tz
->flags
.devices
= 1;
1263 static int acpi_thermal_add(struct acpi_device
*device
)
1266 acpi_status status
= AE_OK
;
1267 struct acpi_thermal
*tz
= NULL
;
1273 tz
= kzalloc(sizeof(struct acpi_thermal
), GFP_KERNEL
);
1277 tz
->device
= device
;
1278 strcpy(tz
->name
, device
->pnp
.bus_id
);
1279 strcpy(acpi_device_name(device
), ACPI_THERMAL_DEVICE_NAME
);
1280 strcpy(acpi_device_class(device
), ACPI_THERMAL_CLASS
);
1281 acpi_driver_data(device
) = tz
;
1283 result
= acpi_thermal_get_info(tz
);
1287 result
= acpi_thermal_add_fs(device
);
1291 init_timer(&tz
->timer
);
1293 acpi_thermal_check(tz
);
1295 status
= acpi_install_notify_handler(device
->handle
,
1297 acpi_thermal_notify
, tz
);
1298 if (ACPI_FAILURE(status
)) {
1303 printk(KERN_INFO PREFIX
"%s [%s] (%ld C)\n",
1304 acpi_device_name(device
), acpi_device_bid(device
),
1305 KELVIN_TO_CELSIUS(tz
->temperature
));
1309 acpi_thermal_remove_fs(device
);
1316 static int acpi_thermal_remove(struct acpi_device
*device
, int type
)
1318 acpi_status status
= AE_OK
;
1319 struct acpi_thermal
*tz
= NULL
;
1322 if (!device
|| !acpi_driver_data(device
))
1325 tz
= acpi_driver_data(device
);
1327 /* avoid timer adding new defer task */
1329 /* wait for running timer (on other CPUs) finish */
1330 del_timer_sync(&(tz
->timer
));
1331 /* synchronize deferred task */
1332 acpi_os_wait_events_complete(NULL
);
1333 /* deferred task may reinsert timer */
1334 del_timer_sync(&(tz
->timer
));
1336 status
= acpi_remove_notify_handler(device
->handle
,
1338 acpi_thermal_notify
);
1340 /* Terminate policy */
1341 if (tz
->trips
.passive
.flags
.valid
&& tz
->trips
.passive
.flags
.enabled
) {
1342 tz
->trips
.passive
.flags
.enabled
= 0;
1343 acpi_thermal_passive(tz
);
1345 if (tz
->trips
.active
[0].flags
.valid
1346 && tz
->trips
.active
[0].flags
.enabled
) {
1347 tz
->trips
.active
[0].flags
.enabled
= 0;
1348 acpi_thermal_active(tz
);
1351 acpi_thermal_remove_fs(device
);
1357 static int acpi_thermal_resume(struct acpi_device
*device
)
1359 struct acpi_thermal
*tz
= NULL
;
1362 if (!device
|| !acpi_driver_data(device
))
1365 tz
= acpi_driver_data(device
);
1367 acpi_thermal_get_temperature(tz
);
1369 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
1370 if (tz
->trips
.active
[i
].flags
.valid
) {
1371 tz
->temperature
= tz
->trips
.active
[i
].temperature
;
1372 tz
->trips
.active
[i
].flags
.enabled
= 0;
1374 acpi_thermal_active(tz
);
1376 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
1377 tz
->state
.active_index
= i
;
1381 acpi_thermal_check(tz
);
1386 static int __init
acpi_thermal_init(void)
1391 acpi_thermal_dir
= proc_mkdir(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1392 if (!acpi_thermal_dir
)
1394 acpi_thermal_dir
->owner
= THIS_MODULE
;
1396 result
= acpi_bus_register_driver(&acpi_thermal_driver
);
1398 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1405 static void __exit
acpi_thermal_exit(void)
1408 acpi_bus_unregister_driver(&acpi_thermal_driver
);
1410 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1415 module_init(acpi_thermal_init
);
1416 module_exit(acpi_thermal_exit
);