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_resume(struct acpi_device
*device
, int state
);
86 static int acpi_thermal_state_open_fs(struct inode
*inode
, struct file
*file
);
87 static int acpi_thermal_temp_open_fs(struct inode
*inode
, struct file
*file
);
88 static int acpi_thermal_trip_open_fs(struct inode
*inode
, struct file
*file
);
89 static ssize_t
acpi_thermal_write_trip_points(struct file
*,
90 const char __user
*, size_t,
92 static int acpi_thermal_cooling_open_fs(struct inode
*inode
, struct file
*file
);
93 static ssize_t
acpi_thermal_write_cooling_mode(struct file
*,
94 const char __user
*, size_t,
96 static int acpi_thermal_polling_open_fs(struct inode
*inode
, struct file
*file
);
97 static ssize_t
acpi_thermal_write_polling(struct file
*, const char __user
*,
100 static struct acpi_driver acpi_thermal_driver
= {
101 .name
= ACPI_THERMAL_DRIVER_NAME
,
102 .class = ACPI_THERMAL_CLASS
,
103 .ids
= ACPI_THERMAL_HID
,
105 .add
= acpi_thermal_add
,
106 .remove
= acpi_thermal_remove
,
107 .resume
= acpi_thermal_resume
,
111 struct acpi_thermal_state
{
120 struct acpi_thermal_state_flags
{
126 struct acpi_thermal_critical
{
127 struct acpi_thermal_state_flags flags
;
128 unsigned long temperature
;
131 struct acpi_thermal_hot
{
132 struct acpi_thermal_state_flags flags
;
133 unsigned long temperature
;
136 struct acpi_thermal_passive
{
137 struct acpi_thermal_state_flags flags
;
138 unsigned long temperature
;
142 struct acpi_handle_list devices
;
145 struct acpi_thermal_active
{
146 struct acpi_thermal_state_flags flags
;
147 unsigned long temperature
;
148 struct acpi_handle_list devices
;
151 struct acpi_thermal_trips
{
152 struct acpi_thermal_critical critical
;
153 struct acpi_thermal_hot hot
;
154 struct acpi_thermal_passive passive
;
155 struct acpi_thermal_active active
[ACPI_THERMAL_MAX_ACTIVE
];
158 struct acpi_thermal_flags
{
159 u8 cooling_mode
:1; /* _SCP */
160 u8 devices
:1; /* _TZD */
164 struct acpi_thermal
{
165 struct acpi_device
* device
;
167 unsigned long temperature
;
168 unsigned long last_temperature
;
169 unsigned long polling_frequency
;
172 struct acpi_thermal_flags flags
;
173 struct acpi_thermal_state state
;
174 struct acpi_thermal_trips trips
;
175 struct acpi_handle_list devices
;
176 struct timer_list timer
;
179 static const struct file_operations acpi_thermal_state_fops
= {
180 .open
= acpi_thermal_state_open_fs
,
183 .release
= single_release
,
186 static const struct file_operations acpi_thermal_temp_fops
= {
187 .open
= acpi_thermal_temp_open_fs
,
190 .release
= single_release
,
193 static const struct file_operations acpi_thermal_trip_fops
= {
194 .open
= acpi_thermal_trip_open_fs
,
196 .write
= acpi_thermal_write_trip_points
,
198 .release
= single_release
,
201 static const struct file_operations acpi_thermal_cooling_fops
= {
202 .open
= acpi_thermal_cooling_open_fs
,
204 .write
= acpi_thermal_write_cooling_mode
,
206 .release
= single_release
,
209 static const struct file_operations acpi_thermal_polling_fops
= {
210 .open
= acpi_thermal_polling_open_fs
,
212 .write
= acpi_thermal_write_polling
,
214 .release
= single_release
,
217 /* --------------------------------------------------------------------------
218 Thermal Zone Management
219 -------------------------------------------------------------------------- */
221 static int acpi_thermal_get_temperature(struct acpi_thermal
*tz
)
223 acpi_status status
= AE_OK
;
229 tz
->last_temperature
= tz
->temperature
;
232 acpi_evaluate_integer(tz
->device
->handle
, "_TMP", NULL
, &tz
->temperature
);
233 if (ACPI_FAILURE(status
))
236 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Temperature is %lu dK\n",
242 static int acpi_thermal_get_polling_frequency(struct acpi_thermal
*tz
)
244 acpi_status status
= AE_OK
;
251 acpi_evaluate_integer(tz
->device
->handle
, "_TZP", NULL
,
252 &tz
->polling_frequency
);
253 if (ACPI_FAILURE(status
))
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
)
268 tz
->polling_frequency
= seconds
* 10; /* Convert value to deci-seconds */
270 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
271 "Polling frequency set to %lu seconds\n",
272 tz
->polling_frequency
));
277 static int acpi_thermal_set_cooling_mode(struct acpi_thermal
*tz
, int mode
)
279 acpi_status status
= AE_OK
;
280 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
281 struct acpi_object_list arg_list
= { 1, &arg0
};
282 acpi_handle handle
= NULL
;
288 status
= acpi_get_handle(tz
->device
->handle
, "_SCP", &handle
);
289 if (ACPI_FAILURE(status
)) {
290 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "_SCP not present\n"));
294 arg0
.integer
.value
= mode
;
296 status
= acpi_evaluate_object(handle
, NULL
, &arg_list
, NULL
);
297 if (ACPI_FAILURE(status
))
300 tz
->cooling_mode
= mode
;
302 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Cooling mode [%s]\n",
303 mode
? "passive" : "active"));
308 static int acpi_thermal_get_trip_points(struct acpi_thermal
*tz
)
310 acpi_status status
= AE_OK
;
317 /* Critical Shutdown (required) */
319 status
= acpi_evaluate_integer(tz
->device
->handle
, "_CRT", NULL
,
320 &tz
->trips
.critical
.temperature
);
321 if (ACPI_FAILURE(status
)) {
322 tz
->trips
.critical
.flags
.valid
= 0;
323 ACPI_EXCEPTION((AE_INFO
, status
, "No critical threshold"));
326 tz
->trips
.critical
.flags
.valid
= 1;
327 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
328 "Found critical threshold [%lu]\n",
329 tz
->trips
.critical
.temperature
));
332 /* Critical Sleep (optional) */
335 acpi_evaluate_integer(tz
->device
->handle
, "_HOT", NULL
,
336 &tz
->trips
.hot
.temperature
);
337 if (ACPI_FAILURE(status
)) {
338 tz
->trips
.hot
.flags
.valid
= 0;
339 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No hot threshold\n"));
341 tz
->trips
.hot
.flags
.valid
= 1;
342 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found hot threshold [%lu]\n",
343 tz
->trips
.hot
.temperature
));
346 /* Passive: Processors (optional) */
349 acpi_evaluate_integer(tz
->device
->handle
, "_PSV", NULL
,
350 &tz
->trips
.passive
.temperature
);
351 if (ACPI_FAILURE(status
)) {
352 tz
->trips
.passive
.flags
.valid
= 0;
353 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No passive threshold\n"));
355 tz
->trips
.passive
.flags
.valid
= 1;
358 acpi_evaluate_integer(tz
->device
->handle
, "_TC1", NULL
,
359 &tz
->trips
.passive
.tc1
);
360 if (ACPI_FAILURE(status
))
361 tz
->trips
.passive
.flags
.valid
= 0;
364 acpi_evaluate_integer(tz
->device
->handle
, "_TC2", NULL
,
365 &tz
->trips
.passive
.tc2
);
366 if (ACPI_FAILURE(status
))
367 tz
->trips
.passive
.flags
.valid
= 0;
370 acpi_evaluate_integer(tz
->device
->handle
, "_TSP", NULL
,
371 &tz
->trips
.passive
.tsp
);
372 if (ACPI_FAILURE(status
))
373 tz
->trips
.passive
.flags
.valid
= 0;
376 acpi_evaluate_reference(tz
->device
->handle
, "_PSL", NULL
,
377 &tz
->trips
.passive
.devices
);
378 if (ACPI_FAILURE(status
))
379 tz
->trips
.passive
.flags
.valid
= 0;
381 if (!tz
->trips
.passive
.flags
.valid
)
382 printk(KERN_WARNING PREFIX
"Invalid passive threshold\n");
384 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
385 "Found passive threshold [%lu]\n",
386 tz
->trips
.passive
.temperature
));
389 /* Active: Fans, etc. (optional) */
391 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
393 char name
[5] = { '_', 'A', 'C', ('0' + i
), '\0' };
396 acpi_evaluate_integer(tz
->device
->handle
, name
, NULL
,
397 &tz
->trips
.active
[i
].temperature
);
398 if (ACPI_FAILURE(status
))
403 acpi_evaluate_reference(tz
->device
->handle
, name
, NULL
,
404 &tz
->trips
.active
[i
].devices
);
405 if (ACPI_SUCCESS(status
)) {
406 tz
->trips
.active
[i
].flags
.valid
= 1;
407 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
408 "Found active threshold [%d]:[%lu]\n",
409 i
, tz
->trips
.active
[i
].temperature
));
411 ACPI_EXCEPTION((AE_INFO
, status
,
412 "Invalid active threshold [%d]", i
));
418 static int acpi_thermal_get_devices(struct acpi_thermal
*tz
)
420 acpi_status status
= AE_OK
;
427 acpi_evaluate_reference(tz
->device
->handle
, "_TZD", NULL
, &tz
->devices
);
428 if (ACPI_FAILURE(status
))
434 static int acpi_thermal_call_usermode(char *path
)
436 char *argv
[2] = { NULL
, NULL
};
437 char *envp
[3] = { NULL
, NULL
, NULL
};
445 /* minimal command environment */
447 envp
[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
449 call_usermodehelper(argv
[0], argv
, envp
, 0);
454 static int acpi_thermal_critical(struct acpi_thermal
*tz
)
456 if (!tz
|| !tz
->trips
.critical
.flags
.valid
)
459 if (tz
->temperature
>= tz
->trips
.critical
.temperature
) {
460 printk(KERN_WARNING PREFIX
"Critical trip point\n");
461 tz
->trips
.critical
.flags
.enabled
= 1;
462 } else if (tz
->trips
.critical
.flags
.enabled
)
463 tz
->trips
.critical
.flags
.enabled
= 0;
466 "Critical temperature reached (%ld C), shutting down.\n",
467 KELVIN_TO_CELSIUS(tz
->temperature
));
468 acpi_bus_generate_event(tz
->device
, ACPI_THERMAL_NOTIFY_CRITICAL
,
469 tz
->trips
.critical
.flags
.enabled
);
471 acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF
);
476 static int acpi_thermal_hot(struct acpi_thermal
*tz
)
478 if (!tz
|| !tz
->trips
.hot
.flags
.valid
)
481 if (tz
->temperature
>= tz
->trips
.hot
.temperature
) {
482 printk(KERN_WARNING PREFIX
"Hot trip point\n");
483 tz
->trips
.hot
.flags
.enabled
= 1;
484 } else if (tz
->trips
.hot
.flags
.enabled
)
485 tz
->trips
.hot
.flags
.enabled
= 0;
487 acpi_bus_generate_event(tz
->device
, ACPI_THERMAL_NOTIFY_HOT
,
488 tz
->trips
.hot
.flags
.enabled
);
490 /* TBD: Call user-mode "sleep(S4)" function */
495 static void acpi_thermal_passive(struct acpi_thermal
*tz
)
498 struct acpi_thermal_passive
*passive
= NULL
;
503 if (!tz
|| !tz
->trips
.passive
.flags
.valid
)
506 passive
= &(tz
->trips
.passive
);
511 * Calculate the thermal trend (using the passive cooling equation)
512 * and modify the performance limit for all passive cooling devices
513 * accordingly. Note that we assume symmetry.
515 if (tz
->temperature
>= passive
->temperature
) {
517 (passive
->tc1
* (tz
->temperature
- tz
->last_temperature
)) +
518 (passive
->tc2
* (tz
->temperature
- passive
->temperature
));
519 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
520 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
521 trend
, passive
->tc1
, tz
->temperature
,
522 tz
->last_temperature
, passive
->tc2
,
523 tz
->temperature
, passive
->temperature
));
524 passive
->flags
.enabled
= 1;
527 for (i
= 0; i
< passive
->devices
.count
; i
++)
528 acpi_processor_set_thermal_limit(passive
->
531 ACPI_PROCESSOR_LIMIT_INCREMENT
);
533 else if (trend
< 0) {
534 for (i
= 0; i
< passive
->devices
.count
; i
++)
536 * assume that we are on highest
537 * freq/lowest thrott and can leave
538 * passive mode, even in error case
540 if (!acpi_processor_set_thermal_limit
541 (passive
->devices
.handles
[i
],
542 ACPI_PROCESSOR_LIMIT_DECREMENT
))
545 * Leave cooling mode, even if the temp might
546 * higher than trip point This is because some
547 * machines might have long thermal polling
548 * frequencies (tsp) defined. We will fall back
549 * into passive mode in next cycle (probably quicker)
552 passive
->flags
.enabled
= 0;
553 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
554 "Disabling passive cooling, still above threshold,"
555 " but we are cooling down\n"));
564 * Implement passive cooling hysteresis to slowly increase performance
565 * and avoid thrashing around the passive trip point. Note that we
568 if (!passive
->flags
.enabled
)
570 for (i
= 0; i
< passive
->devices
.count
; i
++)
571 if (!acpi_processor_set_thermal_limit
572 (passive
->devices
.handles
[i
],
573 ACPI_PROCESSOR_LIMIT_DECREMENT
))
576 passive
->flags
.enabled
= 0;
577 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
578 "Disabling passive cooling (zone is cool)\n"));
582 static void acpi_thermal_active(struct acpi_thermal
*tz
)
585 struct acpi_thermal_active
*active
= NULL
;
588 unsigned long maxtemp
= 0;
594 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
595 active
= &(tz
->trips
.active
[i
]);
596 if (!active
|| !active
->flags
.valid
)
598 if (tz
->temperature
>= active
->temperature
) {
602 * If not already enabled, turn ON all cooling devices
603 * associated with this active threshold.
605 if (active
->temperature
> maxtemp
)
606 tz
->state
.active_index
= i
;
607 maxtemp
= active
->temperature
;
608 if (active
->flags
.enabled
)
610 for (j
= 0; j
< active
->devices
.count
; j
++) {
612 acpi_bus_set_power(active
->devices
.
616 printk(KERN_WARNING PREFIX
617 "Unable to turn cooling device [%p] 'on'\n",
622 active
->flags
.enabled
= 1;
623 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
624 "Cooling device [%p] now 'on'\n",
625 active
->devices
.handles
[j
]));
629 if (!active
->flags
.enabled
)
634 * Turn OFF all cooling devices associated with this
637 for (j
= 0; j
< active
->devices
.count
; j
++) {
638 result
= acpi_bus_set_power(active
->devices
.handles
[j
],
641 printk(KERN_WARNING PREFIX
642 "Unable to turn cooling device [%p] 'off'\n",
643 active
->devices
.handles
[j
]);
646 active
->flags
.enabled
= 0;
647 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
648 "Cooling device [%p] now 'off'\n",
649 active
->devices
.handles
[j
]));
654 static void acpi_thermal_check(void *context
);
656 static void acpi_thermal_run(unsigned long data
)
658 struct acpi_thermal
*tz
= (struct acpi_thermal
*)data
;
660 acpi_os_execute(OSL_GPE_HANDLER
, acpi_thermal_check
, (void *)data
);
663 static void acpi_thermal_check(void *data
)
666 struct acpi_thermal
*tz
= data
;
667 unsigned long sleep_time
= 0;
669 struct acpi_thermal_state state
;
673 printk(KERN_ERR PREFIX
"Invalid (NULL) context\n");
679 result
= acpi_thermal_get_temperature(tz
);
683 memset(&tz
->state
, 0, sizeof(tz
->state
));
688 * Compare the current temperature to the trip point values to see
689 * if we've entered one of the thermal policy states. Note that
690 * this function determines when a state is entered, but the
691 * individual policy decides when it is exited (e.g. hysteresis).
693 if (tz
->trips
.critical
.flags
.valid
)
695 (tz
->temperature
>= tz
->trips
.critical
.temperature
);
696 if (tz
->trips
.hot
.flags
.valid
)
697 state
.hot
|= (tz
->temperature
>= tz
->trips
.hot
.temperature
);
698 if (tz
->trips
.passive
.flags
.valid
)
700 (tz
->temperature
>= tz
->trips
.passive
.temperature
);
701 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
702 if (tz
->trips
.active
[i
].flags
.valid
)
705 tz
->trips
.active
[i
].temperature
);
710 * Separated from the above check to allow individual policy to
711 * determine when to exit a given state.
714 acpi_thermal_critical(tz
);
716 acpi_thermal_hot(tz
);
718 acpi_thermal_passive(tz
);
720 acpi_thermal_active(tz
);
725 * Again, separated from the above two to allow independent policy
728 tz
->state
.critical
= tz
->trips
.critical
.flags
.enabled
;
729 tz
->state
.hot
= tz
->trips
.hot
.flags
.enabled
;
730 tz
->state
.passive
= tz
->trips
.passive
.flags
.enabled
;
731 tz
->state
.active
= 0;
732 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
733 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
736 * Calculate Sleep Time
737 * --------------------
738 * If we're in the passive state, use _TSP's value. Otherwise
739 * use the default polling frequency (e.g. _TZP). If no polling
740 * frequency is specified then we'll wait forever (at least until
741 * a thermal event occurs). Note that _TSP and _TZD values are
742 * given in 1/10th seconds (we must covert to milliseconds).
744 if (tz
->state
.passive
)
745 sleep_time
= tz
->trips
.passive
.tsp
* 100;
746 else if (tz
->polling_frequency
> 0)
747 sleep_time
= tz
->polling_frequency
* 100;
749 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "%s: temperature[%lu] sleep[%lu]\n",
750 tz
->name
, tz
->temperature
, sleep_time
));
757 if (timer_pending(&(tz
->timer
)))
758 del_timer(&(tz
->timer
));
760 if (timer_pending(&(tz
->timer
)))
761 mod_timer(&(tz
->timer
), (HZ
* sleep_time
) / 1000);
763 tz
->timer
.data
= (unsigned long)tz
;
764 tz
->timer
.function
= acpi_thermal_run
;
765 tz
->timer
.expires
= jiffies
+ (HZ
* sleep_time
) / 1000;
766 add_timer(&(tz
->timer
));
773 /* --------------------------------------------------------------------------
775 -------------------------------------------------------------------------- */
777 static struct proc_dir_entry
*acpi_thermal_dir
;
779 static int acpi_thermal_state_seq_show(struct seq_file
*seq
, void *offset
)
781 struct acpi_thermal
*tz
= seq
->private;
787 seq_puts(seq
, "state: ");
789 if (!tz
->state
.critical
&& !tz
->state
.hot
&& !tz
->state
.passive
790 && !tz
->state
.active
)
791 seq_puts(seq
, "ok\n");
793 if (tz
->state
.critical
)
794 seq_puts(seq
, "critical ");
796 seq_puts(seq
, "hot ");
797 if (tz
->state
.passive
)
798 seq_puts(seq
, "passive ");
799 if (tz
->state
.active
)
800 seq_printf(seq
, "active[%d]", tz
->state
.active_index
);
808 static int acpi_thermal_state_open_fs(struct inode
*inode
, struct file
*file
)
810 return single_open(file
, acpi_thermal_state_seq_show
, PDE(inode
)->data
);
813 static int acpi_thermal_temp_seq_show(struct seq_file
*seq
, void *offset
)
816 struct acpi_thermal
*tz
= seq
->private;
822 result
= acpi_thermal_get_temperature(tz
);
826 seq_printf(seq
, "temperature: %ld C\n",
827 KELVIN_TO_CELSIUS(tz
->temperature
));
833 static int acpi_thermal_temp_open_fs(struct inode
*inode
, struct file
*file
)
835 return single_open(file
, acpi_thermal_temp_seq_show
, PDE(inode
)->data
);
838 static int acpi_thermal_trip_seq_show(struct seq_file
*seq
, void *offset
)
840 struct acpi_thermal
*tz
= seq
->private;
848 if (tz
->trips
.critical
.flags
.valid
)
849 seq_printf(seq
, "critical (S5): %ld C\n",
850 KELVIN_TO_CELSIUS(tz
->trips
.critical
.temperature
));
852 if (tz
->trips
.hot
.flags
.valid
)
853 seq_printf(seq
, "hot (S4): %ld C\n",
854 KELVIN_TO_CELSIUS(tz
->trips
.hot
.temperature
));
856 if (tz
->trips
.passive
.flags
.valid
) {
858 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
859 KELVIN_TO_CELSIUS(tz
->trips
.passive
.temperature
),
860 tz
->trips
.passive
.tc1
, tz
->trips
.passive
.tc2
,
861 tz
->trips
.passive
.tsp
);
862 for (j
= 0; j
< tz
->trips
.passive
.devices
.count
; j
++) {
864 seq_printf(seq
, "0x%p ",
865 tz
->trips
.passive
.devices
.handles
[j
]);
870 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
871 if (!(tz
->trips
.active
[i
].flags
.valid
))
873 seq_printf(seq
, "active[%d]: %ld C: devices=",
875 KELVIN_TO_CELSIUS(tz
->trips
.active
[i
].temperature
));
876 for (j
= 0; j
< tz
->trips
.active
[i
].devices
.count
; j
++)
877 seq_printf(seq
, "0x%p ",
878 tz
->trips
.active
[i
].devices
.handles
[j
]);
886 static int acpi_thermal_trip_open_fs(struct inode
*inode
, struct file
*file
)
888 return single_open(file
, acpi_thermal_trip_seq_show
, PDE(inode
)->data
);
892 acpi_thermal_write_trip_points(struct file
*file
,
893 const char __user
* buffer
,
894 size_t count
, loff_t
* ppos
)
896 struct seq_file
*m
= file
->private_data
;
897 struct acpi_thermal
*tz
= m
->private;
900 int num
, critical
, hot
, passive
;
905 limit_string
= kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN
, GFP_KERNEL
);
909 memset(limit_string
, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN
);
911 active
= kmalloc(ACPI_THERMAL_MAX_ACTIVE
* sizeof(int), GFP_KERNEL
);
917 if (!tz
|| (count
> ACPI_THERMAL_MAX_LIMIT_STR_LEN
- 1)) {
922 if (copy_from_user(limit_string
, buffer
, count
)) {
927 limit_string
[count
] = '\0';
929 num
= sscanf(limit_string
, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
930 &critical
, &hot
, &passive
,
931 &active
[0], &active
[1], &active
[2], &active
[3], &active
[4],
932 &active
[5], &active
[6], &active
[7], &active
[8],
934 if (!(num
>= 5 && num
< (ACPI_THERMAL_MAX_ACTIVE
+ 3))) {
939 tz
->trips
.critical
.temperature
= CELSIUS_TO_KELVIN(critical
);
940 tz
->trips
.hot
.temperature
= CELSIUS_TO_KELVIN(hot
);
941 tz
->trips
.passive
.temperature
= CELSIUS_TO_KELVIN(passive
);
942 for (i
= 0; i
< num
- 3; i
++) {
943 if (!(tz
->trips
.active
[i
].flags
.valid
))
945 tz
->trips
.active
[i
].temperature
= CELSIUS_TO_KELVIN(active
[i
]);
954 static int acpi_thermal_cooling_seq_show(struct seq_file
*seq
, void *offset
)
956 struct acpi_thermal
*tz
= seq
->private;
962 if (!tz
->flags
.cooling_mode
) {
963 seq_puts(seq
, "<setting not supported>\n");
966 if (tz
->cooling_mode
== ACPI_THERMAL_MODE_CRITICAL
)
967 seq_printf(seq
, "cooling mode: critical\n");
969 seq_printf(seq
, "cooling mode: %s\n",
970 tz
->cooling_mode
? "passive" : "active");
976 static int acpi_thermal_cooling_open_fs(struct inode
*inode
, struct file
*file
)
978 return single_open(file
, acpi_thermal_cooling_seq_show
,
983 acpi_thermal_write_cooling_mode(struct file
*file
,
984 const char __user
* buffer
,
985 size_t count
, loff_t
* ppos
)
987 struct seq_file
*m
= file
->private_data
;
988 struct acpi_thermal
*tz
= m
->private;
990 char mode_string
[12] = { '\0' };
993 if (!tz
|| (count
> sizeof(mode_string
) - 1))
996 if (!tz
->flags
.cooling_mode
)
999 if (copy_from_user(mode_string
, buffer
, count
))
1002 mode_string
[count
] = '\0';
1004 result
= acpi_thermal_set_cooling_mode(tz
,
1005 simple_strtoul(mode_string
, NULL
,
1010 acpi_thermal_check(tz
);
1015 static int acpi_thermal_polling_seq_show(struct seq_file
*seq
, void *offset
)
1017 struct acpi_thermal
*tz
= seq
->private;
1023 if (!tz
->polling_frequency
) {
1024 seq_puts(seq
, "<polling disabled>\n");
1028 seq_printf(seq
, "polling frequency: %lu seconds\n",
1029 (tz
->polling_frequency
/ 10));
1035 static int acpi_thermal_polling_open_fs(struct inode
*inode
, struct file
*file
)
1037 return single_open(file
, acpi_thermal_polling_seq_show
,
1042 acpi_thermal_write_polling(struct file
*file
,
1043 const char __user
* buffer
,
1044 size_t count
, loff_t
* ppos
)
1046 struct seq_file
*m
= file
->private_data
;
1047 struct acpi_thermal
*tz
= m
->private;
1049 char polling_string
[12] = { '\0' };
1053 if (!tz
|| (count
> sizeof(polling_string
) - 1))
1056 if (copy_from_user(polling_string
, buffer
, count
))
1059 polling_string
[count
] = '\0';
1061 seconds
= simple_strtoul(polling_string
, NULL
, 0);
1063 result
= acpi_thermal_set_polling(tz
, seconds
);
1067 acpi_thermal_check(tz
);
1072 static int acpi_thermal_add_fs(struct acpi_device
*device
)
1074 struct proc_dir_entry
*entry
= NULL
;
1077 if (!acpi_device_dir(device
)) {
1078 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
1080 if (!acpi_device_dir(device
))
1082 acpi_device_dir(device
)->owner
= THIS_MODULE
;
1086 entry
= create_proc_entry(ACPI_THERMAL_FILE_STATE
,
1087 S_IRUGO
, acpi_device_dir(device
));
1091 entry
->proc_fops
= &acpi_thermal_state_fops
;
1092 entry
->data
= acpi_driver_data(device
);
1093 entry
->owner
= THIS_MODULE
;
1096 /* 'temperature' [R] */
1097 entry
= create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE
,
1098 S_IRUGO
, acpi_device_dir(device
));
1102 entry
->proc_fops
= &acpi_thermal_temp_fops
;
1103 entry
->data
= acpi_driver_data(device
);
1104 entry
->owner
= THIS_MODULE
;
1107 /* 'trip_points' [R/W] */
1108 entry
= create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS
,
1109 S_IFREG
| S_IRUGO
| S_IWUSR
,
1110 acpi_device_dir(device
));
1114 entry
->proc_fops
= &acpi_thermal_trip_fops
;
1115 entry
->data
= acpi_driver_data(device
);
1116 entry
->owner
= THIS_MODULE
;
1119 /* 'cooling_mode' [R/W] */
1120 entry
= create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE
,
1121 S_IFREG
| S_IRUGO
| S_IWUSR
,
1122 acpi_device_dir(device
));
1126 entry
->proc_fops
= &acpi_thermal_cooling_fops
;
1127 entry
->data
= acpi_driver_data(device
);
1128 entry
->owner
= THIS_MODULE
;
1131 /* 'polling_frequency' [R/W] */
1132 entry
= create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ
,
1133 S_IFREG
| S_IRUGO
| S_IWUSR
,
1134 acpi_device_dir(device
));
1138 entry
->proc_fops
= &acpi_thermal_polling_fops
;
1139 entry
->data
= acpi_driver_data(device
);
1140 entry
->owner
= THIS_MODULE
;
1146 static int acpi_thermal_remove_fs(struct acpi_device
*device
)
1149 if (acpi_device_dir(device
)) {
1150 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ
,
1151 acpi_device_dir(device
));
1152 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE
,
1153 acpi_device_dir(device
));
1154 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS
,
1155 acpi_device_dir(device
));
1156 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE
,
1157 acpi_device_dir(device
));
1158 remove_proc_entry(ACPI_THERMAL_FILE_STATE
,
1159 acpi_device_dir(device
));
1160 remove_proc_entry(acpi_device_bid(device
), acpi_thermal_dir
);
1161 acpi_device_dir(device
) = NULL
;
1167 /* --------------------------------------------------------------------------
1169 -------------------------------------------------------------------------- */
1171 static void acpi_thermal_notify(acpi_handle handle
, u32 event
, void *data
)
1173 struct acpi_thermal
*tz
= data
;
1174 struct acpi_device
*device
= NULL
;
1180 device
= tz
->device
;
1183 case ACPI_THERMAL_NOTIFY_TEMPERATURE
:
1184 acpi_thermal_check(tz
);
1186 case ACPI_THERMAL_NOTIFY_THRESHOLDS
:
1187 acpi_thermal_get_trip_points(tz
);
1188 acpi_thermal_check(tz
);
1189 acpi_bus_generate_event(device
, event
, 0);
1191 case ACPI_THERMAL_NOTIFY_DEVICES
:
1192 if (tz
->flags
.devices
)
1193 acpi_thermal_get_devices(tz
);
1194 acpi_bus_generate_event(device
, event
, 0);
1197 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1198 "Unsupported event [0x%x]\n", event
));
1205 static int acpi_thermal_get_info(struct acpi_thermal
*tz
)
1213 /* Get temperature [_TMP] (required) */
1214 result
= acpi_thermal_get_temperature(tz
);
1218 /* Get trip points [_CRT, _PSV, etc.] (required) */
1219 result
= acpi_thermal_get_trip_points(tz
);
1223 /* Set the cooling mode [_SCP] to active cooling (default) */
1224 result
= acpi_thermal_set_cooling_mode(tz
, ACPI_THERMAL_MODE_ACTIVE
);
1226 tz
->flags
.cooling_mode
= 1;
1228 /* Oh,we have not _SCP method.
1229 Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1230 tz
->flags
.cooling_mode
= 0;
1231 if (tz
->trips
.active
[0].flags
.valid
1232 && tz
->trips
.passive
.flags
.valid
) {
1233 if (tz
->trips
.passive
.temperature
>
1234 tz
->trips
.active
[0].temperature
)
1235 tz
->cooling_mode
= ACPI_THERMAL_MODE_ACTIVE
;
1237 tz
->cooling_mode
= ACPI_THERMAL_MODE_PASSIVE
;
1238 } else if (!tz
->trips
.active
[0].flags
.valid
1239 && tz
->trips
.passive
.flags
.valid
) {
1240 tz
->cooling_mode
= ACPI_THERMAL_MODE_PASSIVE
;
1241 } else if (tz
->trips
.active
[0].flags
.valid
1242 && !tz
->trips
.passive
.flags
.valid
) {
1243 tz
->cooling_mode
= ACPI_THERMAL_MODE_ACTIVE
;
1245 /* _ACx and _PSV are optional, but _CRT is required */
1246 tz
->cooling_mode
= ACPI_THERMAL_MODE_CRITICAL
;
1250 /* Get default polling frequency [_TZP] (optional) */
1252 tz
->polling_frequency
= tzp
;
1254 acpi_thermal_get_polling_frequency(tz
);
1256 /* Get devices in this thermal zone [_TZD] (optional) */
1257 result
= acpi_thermal_get_devices(tz
);
1259 tz
->flags
.devices
= 1;
1264 static int acpi_thermal_add(struct acpi_device
*device
)
1267 acpi_status status
= AE_OK
;
1268 struct acpi_thermal
*tz
= NULL
;
1274 tz
= kmalloc(sizeof(struct acpi_thermal
), GFP_KERNEL
);
1277 memset(tz
, 0, sizeof(struct acpi_thermal
));
1279 tz
->device
= device
;
1280 strcpy(tz
->name
, device
->pnp
.bus_id
);
1281 strcpy(acpi_device_name(device
), ACPI_THERMAL_DEVICE_NAME
);
1282 strcpy(acpi_device_class(device
), ACPI_THERMAL_CLASS
);
1283 acpi_driver_data(device
) = tz
;
1285 result
= acpi_thermal_get_info(tz
);
1289 result
= acpi_thermal_add_fs(device
);
1293 init_timer(&tz
->timer
);
1295 acpi_thermal_check(tz
);
1297 status
= acpi_install_notify_handler(device
->handle
,
1299 acpi_thermal_notify
, tz
);
1300 if (ACPI_FAILURE(status
)) {
1305 printk(KERN_INFO PREFIX
"%s [%s] (%ld C)\n",
1306 acpi_device_name(device
), acpi_device_bid(device
),
1307 KELVIN_TO_CELSIUS(tz
->temperature
));
1311 acpi_thermal_remove_fs(device
);
1318 static int acpi_thermal_remove(struct acpi_device
*device
, int type
)
1320 acpi_status status
= AE_OK
;
1321 struct acpi_thermal
*tz
= NULL
;
1324 if (!device
|| !acpi_driver_data(device
))
1327 tz
= acpi_driver_data(device
);
1329 /* avoid timer adding new defer task */
1331 /* wait for running timer (on other CPUs) finish */
1332 del_timer_sync(&(tz
->timer
));
1333 /* synchronize deferred task */
1334 acpi_os_wait_events_complete(NULL
);
1335 /* deferred task may reinsert timer */
1336 del_timer_sync(&(tz
->timer
));
1338 status
= acpi_remove_notify_handler(device
->handle
,
1340 acpi_thermal_notify
);
1342 /* Terminate policy */
1343 if (tz
->trips
.passive
.flags
.valid
&& tz
->trips
.passive
.flags
.enabled
) {
1344 tz
->trips
.passive
.flags
.enabled
= 0;
1345 acpi_thermal_passive(tz
);
1347 if (tz
->trips
.active
[0].flags
.valid
1348 && tz
->trips
.active
[0].flags
.enabled
) {
1349 tz
->trips
.active
[0].flags
.enabled
= 0;
1350 acpi_thermal_active(tz
);
1353 acpi_thermal_remove_fs(device
);
1359 static int acpi_thermal_resume(struct acpi_device
*device
, int state
)
1361 struct acpi_thermal
*tz
= NULL
;
1364 if (!device
|| !acpi_driver_data(device
))
1367 tz
= acpi_driver_data(device
);
1369 acpi_thermal_get_temperature(tz
);
1371 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
1372 if (tz
->trips
.active
[i
].flags
.valid
) {
1373 tz
->temperature
= tz
->trips
.active
[i
].temperature
;
1374 tz
->trips
.active
[i
].flags
.enabled
= 0;
1376 acpi_thermal_active(tz
);
1378 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
1379 tz
->state
.active_index
= i
;
1383 acpi_thermal_check(tz
);
1388 static int __init
acpi_thermal_init(void)
1393 acpi_thermal_dir
= proc_mkdir(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1394 if (!acpi_thermal_dir
)
1396 acpi_thermal_dir
->owner
= THIS_MODULE
;
1398 result
= acpi_bus_register_driver(&acpi_thermal_driver
);
1400 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1407 static void __exit
acpi_thermal_exit(void)
1410 acpi_bus_unregister_driver(&acpi_thermal_driver
);
1412 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1417 module_init(acpi_thermal_init
);
1418 module_exit(acpi_thermal_exit
);