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
{
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 struct file_operations acpi_thermal_state_fops
= {
180 .open
= acpi_thermal_state_open_fs
,
183 .release
= single_release
,
186 static struct file_operations acpi_thermal_temp_fops
= {
187 .open
= acpi_thermal_temp_open_fs
,
190 .release
= single_release
,
193 static 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 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 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
->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
->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
->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
->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
->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
->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
->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
->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
->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
->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
->handle
, name
, NULL
,
397 &tz
->trips
.active
[i
].temperature
);
398 if (ACPI_FAILURE(status
))
403 acpi_evaluate_reference(tz
->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
->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
)
457 struct acpi_device
*device
= NULL
;
460 if (!tz
|| !tz
->trips
.critical
.flags
.valid
)
463 if (tz
->temperature
>= tz
->trips
.critical
.temperature
) {
464 printk(KERN_WARNING PREFIX
"Critical trip point\n");
465 tz
->trips
.critical
.flags
.enabled
= 1;
466 } else if (tz
->trips
.critical
.flags
.enabled
)
467 tz
->trips
.critical
.flags
.enabled
= 0;
469 result
= acpi_bus_get_device(tz
->handle
, &device
);
474 "Critical temperature reached (%ld C), shutting down.\n",
475 KELVIN_TO_CELSIUS(tz
->temperature
));
476 acpi_bus_generate_event(device
, ACPI_THERMAL_NOTIFY_CRITICAL
,
477 tz
->trips
.critical
.flags
.enabled
);
479 acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF
);
484 static int acpi_thermal_hot(struct acpi_thermal
*tz
)
487 struct acpi_device
*device
= NULL
;
490 if (!tz
|| !tz
->trips
.hot
.flags
.valid
)
493 if (tz
->temperature
>= tz
->trips
.hot
.temperature
) {
494 printk(KERN_WARNING PREFIX
"Hot trip point\n");
495 tz
->trips
.hot
.flags
.enabled
= 1;
496 } else if (tz
->trips
.hot
.flags
.enabled
)
497 tz
->trips
.hot
.flags
.enabled
= 0;
499 result
= acpi_bus_get_device(tz
->handle
, &device
);
503 acpi_bus_generate_event(device
, ACPI_THERMAL_NOTIFY_HOT
,
504 tz
->trips
.hot
.flags
.enabled
);
506 /* TBD: Call user-mode "sleep(S4)" function */
511 static void acpi_thermal_passive(struct acpi_thermal
*tz
)
514 struct acpi_thermal_passive
*passive
= NULL
;
519 if (!tz
|| !tz
->trips
.passive
.flags
.valid
)
522 passive
= &(tz
->trips
.passive
);
527 * Calculate the thermal trend (using the passive cooling equation)
528 * and modify the performance limit for all passive cooling devices
529 * accordingly. Note that we assume symmetry.
531 if (tz
->temperature
>= passive
->temperature
) {
533 (passive
->tc1
* (tz
->temperature
- tz
->last_temperature
)) +
534 (passive
->tc2
* (tz
->temperature
- passive
->temperature
));
535 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
536 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
537 trend
, passive
->tc1
, tz
->temperature
,
538 tz
->last_temperature
, passive
->tc2
,
539 tz
->temperature
, passive
->temperature
));
540 passive
->flags
.enabled
= 1;
543 for (i
= 0; i
< passive
->devices
.count
; i
++)
544 acpi_processor_set_thermal_limit(passive
->
547 ACPI_PROCESSOR_LIMIT_INCREMENT
);
549 else if (trend
< 0) {
550 for (i
= 0; i
< passive
->devices
.count
; i
++)
552 * assume that we are on highest
553 * freq/lowest thrott and can leave
554 * passive mode, even in error case
556 if (!acpi_processor_set_thermal_limit
557 (passive
->devices
.handles
[i
],
558 ACPI_PROCESSOR_LIMIT_DECREMENT
))
561 * Leave cooling mode, even if the temp might
562 * higher than trip point This is because some
563 * machines might have long thermal polling
564 * frequencies (tsp) defined. We will fall back
565 * into passive mode in next cycle (probably quicker)
568 passive
->flags
.enabled
= 0;
569 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
570 "Disabling passive cooling, still above threshold,"
571 " but we are cooling down\n"));
580 * Implement passive cooling hysteresis to slowly increase performance
581 * and avoid thrashing around the passive trip point. Note that we
584 if (!passive
->flags
.enabled
)
586 for (i
= 0; i
< passive
->devices
.count
; i
++)
587 if (!acpi_processor_set_thermal_limit
588 (passive
->devices
.handles
[i
],
589 ACPI_PROCESSOR_LIMIT_DECREMENT
))
592 passive
->flags
.enabled
= 0;
593 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
594 "Disabling passive cooling (zone is cool)\n"));
598 static void acpi_thermal_active(struct acpi_thermal
*tz
)
601 struct acpi_thermal_active
*active
= NULL
;
604 unsigned long maxtemp
= 0;
610 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
611 active
= &(tz
->trips
.active
[i
]);
612 if (!active
|| !active
->flags
.valid
)
614 if (tz
->temperature
>= active
->temperature
) {
618 * If not already enabled, turn ON all cooling devices
619 * associated with this active threshold.
621 if (active
->temperature
> maxtemp
)
622 tz
->state
.active_index
= i
;
623 maxtemp
= active
->temperature
;
624 if (active
->flags
.enabled
)
626 for (j
= 0; j
< active
->devices
.count
; j
++) {
628 acpi_bus_set_power(active
->devices
.
632 printk(KERN_WARNING PREFIX
633 "Unable to turn cooling device [%p] 'on'\n",
638 active
->flags
.enabled
= 1;
639 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
640 "Cooling device [%p] now 'on'\n",
641 active
->devices
.handles
[j
]));
645 if (!active
->flags
.enabled
)
650 * Turn OFF all cooling devices associated with this
653 for (j
= 0; j
< active
->devices
.count
; j
++) {
654 result
= acpi_bus_set_power(active
->devices
.handles
[j
],
657 printk(KERN_WARNING PREFIX
658 "Unable to turn cooling device [%p] 'off'\n",
659 active
->devices
.handles
[j
]);
662 active
->flags
.enabled
= 0;
663 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
664 "Cooling device [%p] now 'off'\n",
665 active
->devices
.handles
[j
]));
670 static void acpi_thermal_check(void *context
);
672 static void acpi_thermal_run(unsigned long data
)
674 struct acpi_thermal
*tz
= (struct acpi_thermal
*)data
;
676 acpi_os_execute(OSL_GPE_HANDLER
, acpi_thermal_check
, (void *)data
);
679 static void acpi_thermal_check(void *data
)
682 struct acpi_thermal
*tz
= (struct acpi_thermal
*)data
;
683 unsigned long sleep_time
= 0;
685 struct acpi_thermal_state state
;
689 printk(KERN_ERR PREFIX
"Invalid (NULL) context\n");
695 result
= acpi_thermal_get_temperature(tz
);
699 memset(&tz
->state
, 0, sizeof(tz
->state
));
704 * Compare the current temperature to the trip point values to see
705 * if we've entered one of the thermal policy states. Note that
706 * this function determines when a state is entered, but the
707 * individual policy decides when it is exited (e.g. hysteresis).
709 if (tz
->trips
.critical
.flags
.valid
)
711 (tz
->temperature
>= tz
->trips
.critical
.temperature
);
712 if (tz
->trips
.hot
.flags
.valid
)
713 state
.hot
|= (tz
->temperature
>= tz
->trips
.hot
.temperature
);
714 if (tz
->trips
.passive
.flags
.valid
)
716 (tz
->temperature
>= tz
->trips
.passive
.temperature
);
717 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
718 if (tz
->trips
.active
[i
].flags
.valid
)
721 tz
->trips
.active
[i
].temperature
);
726 * Separated from the above check to allow individual policy to
727 * determine when to exit a given state.
730 acpi_thermal_critical(tz
);
732 acpi_thermal_hot(tz
);
734 acpi_thermal_passive(tz
);
736 acpi_thermal_active(tz
);
741 * Again, separated from the above two to allow independent policy
744 tz
->state
.critical
= tz
->trips
.critical
.flags
.enabled
;
745 tz
->state
.hot
= tz
->trips
.hot
.flags
.enabled
;
746 tz
->state
.passive
= tz
->trips
.passive
.flags
.enabled
;
747 tz
->state
.active
= 0;
748 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
749 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
752 * Calculate Sleep Time
753 * --------------------
754 * If we're in the passive state, use _TSP's value. Otherwise
755 * use the default polling frequency (e.g. _TZP). If no polling
756 * frequency is specified then we'll wait forever (at least until
757 * a thermal event occurs). Note that _TSP and _TZD values are
758 * given in 1/10th seconds (we must covert to milliseconds).
760 if (tz
->state
.passive
)
761 sleep_time
= tz
->trips
.passive
.tsp
* 100;
762 else if (tz
->polling_frequency
> 0)
763 sleep_time
= tz
->polling_frequency
* 100;
765 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "%s: temperature[%lu] sleep[%lu]\n",
766 tz
->name
, tz
->temperature
, sleep_time
));
773 if (timer_pending(&(tz
->timer
)))
774 del_timer(&(tz
->timer
));
776 if (timer_pending(&(tz
->timer
)))
777 mod_timer(&(tz
->timer
), (HZ
* sleep_time
) / 1000);
779 tz
->timer
.data
= (unsigned long)tz
;
780 tz
->timer
.function
= acpi_thermal_run
;
781 tz
->timer
.expires
= jiffies
+ (HZ
* sleep_time
) / 1000;
782 add_timer(&(tz
->timer
));
789 /* --------------------------------------------------------------------------
791 -------------------------------------------------------------------------- */
793 static struct proc_dir_entry
*acpi_thermal_dir
;
795 static int acpi_thermal_state_seq_show(struct seq_file
*seq
, void *offset
)
797 struct acpi_thermal
*tz
= (struct acpi_thermal
*)seq
->private;
803 seq_puts(seq
, "state: ");
805 if (!tz
->state
.critical
&& !tz
->state
.hot
&& !tz
->state
.passive
806 && !tz
->state
.active
)
807 seq_puts(seq
, "ok\n");
809 if (tz
->state
.critical
)
810 seq_puts(seq
, "critical ");
812 seq_puts(seq
, "hot ");
813 if (tz
->state
.passive
)
814 seq_puts(seq
, "passive ");
815 if (tz
->state
.active
)
816 seq_printf(seq
, "active[%d]", tz
->state
.active_index
);
824 static int acpi_thermal_state_open_fs(struct inode
*inode
, struct file
*file
)
826 return single_open(file
, acpi_thermal_state_seq_show
, PDE(inode
)->data
);
829 static int acpi_thermal_temp_seq_show(struct seq_file
*seq
, void *offset
)
832 struct acpi_thermal
*tz
= (struct acpi_thermal
*)seq
->private;
838 result
= acpi_thermal_get_temperature(tz
);
842 seq_printf(seq
, "temperature: %ld C\n",
843 KELVIN_TO_CELSIUS(tz
->temperature
));
849 static int acpi_thermal_temp_open_fs(struct inode
*inode
, struct file
*file
)
851 return single_open(file
, acpi_thermal_temp_seq_show
, PDE(inode
)->data
);
854 static int acpi_thermal_trip_seq_show(struct seq_file
*seq
, void *offset
)
856 struct acpi_thermal
*tz
= (struct acpi_thermal
*)seq
->private;
864 if (tz
->trips
.critical
.flags
.valid
)
865 seq_printf(seq
, "critical (S5): %ld C\n",
866 KELVIN_TO_CELSIUS(tz
->trips
.critical
.temperature
));
868 if (tz
->trips
.hot
.flags
.valid
)
869 seq_printf(seq
, "hot (S4): %ld C\n",
870 KELVIN_TO_CELSIUS(tz
->trips
.hot
.temperature
));
872 if (tz
->trips
.passive
.flags
.valid
) {
874 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
875 KELVIN_TO_CELSIUS(tz
->trips
.passive
.temperature
),
876 tz
->trips
.passive
.tc1
, tz
->trips
.passive
.tc2
,
877 tz
->trips
.passive
.tsp
);
878 for (j
= 0; j
< tz
->trips
.passive
.devices
.count
; j
++) {
880 seq_printf(seq
, "0x%p ",
881 tz
->trips
.passive
.devices
.handles
[j
]);
886 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
887 if (!(tz
->trips
.active
[i
].flags
.valid
))
889 seq_printf(seq
, "active[%d]: %ld C: devices=",
891 KELVIN_TO_CELSIUS(tz
->trips
.active
[i
].temperature
));
892 for (j
= 0; j
< tz
->trips
.active
[i
].devices
.count
; j
++)
893 seq_printf(seq
, "0x%p ",
894 tz
->trips
.active
[i
].devices
.handles
[j
]);
902 static int acpi_thermal_trip_open_fs(struct inode
*inode
, struct file
*file
)
904 return single_open(file
, acpi_thermal_trip_seq_show
, PDE(inode
)->data
);
908 acpi_thermal_write_trip_points(struct file
*file
,
909 const char __user
* buffer
,
910 size_t count
, loff_t
* ppos
)
912 struct seq_file
*m
= (struct seq_file
*)file
->private_data
;
913 struct acpi_thermal
*tz
= (struct acpi_thermal
*)m
->private;
916 int num
, critical
, hot
, passive
;
921 limit_string
= kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN
, GFP_KERNEL
);
925 memset(limit_string
, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN
);
927 active
= kmalloc(ACPI_THERMAL_MAX_ACTIVE
* sizeof(int), GFP_KERNEL
);
933 if (!tz
|| (count
> ACPI_THERMAL_MAX_LIMIT_STR_LEN
- 1)) {
938 if (copy_from_user(limit_string
, buffer
, count
)) {
943 limit_string
[count
] = '\0';
945 num
= sscanf(limit_string
, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
946 &critical
, &hot
, &passive
,
947 &active
[0], &active
[1], &active
[2], &active
[3], &active
[4],
948 &active
[5], &active
[6], &active
[7], &active
[8],
950 if (!(num
>= 5 && num
< (ACPI_THERMAL_MAX_ACTIVE
+ 3))) {
955 tz
->trips
.critical
.temperature
= CELSIUS_TO_KELVIN(critical
);
956 tz
->trips
.hot
.temperature
= CELSIUS_TO_KELVIN(hot
);
957 tz
->trips
.passive
.temperature
= CELSIUS_TO_KELVIN(passive
);
958 for (i
= 0; i
< num
- 3; i
++) {
959 if (!(tz
->trips
.active
[i
].flags
.valid
))
961 tz
->trips
.active
[i
].temperature
= CELSIUS_TO_KELVIN(active
[i
]);
970 static int acpi_thermal_cooling_seq_show(struct seq_file
*seq
, void *offset
)
972 struct acpi_thermal
*tz
= (struct acpi_thermal
*)seq
->private;
978 if (!tz
->flags
.cooling_mode
) {
979 seq_puts(seq
, "<setting not supported>\n");
982 if (tz
->cooling_mode
== ACPI_THERMAL_MODE_CRITICAL
)
983 seq_printf(seq
, "cooling mode: critical\n");
985 seq_printf(seq
, "cooling mode: %s\n",
986 tz
->cooling_mode
? "passive" : "active");
992 static int acpi_thermal_cooling_open_fs(struct inode
*inode
, struct file
*file
)
994 return single_open(file
, acpi_thermal_cooling_seq_show
,
999 acpi_thermal_write_cooling_mode(struct file
*file
,
1000 const char __user
* buffer
,
1001 size_t count
, loff_t
* ppos
)
1003 struct seq_file
*m
= (struct seq_file
*)file
->private_data
;
1004 struct acpi_thermal
*tz
= (struct acpi_thermal
*)m
->private;
1006 char mode_string
[12] = { '\0' };
1009 if (!tz
|| (count
> sizeof(mode_string
) - 1))
1012 if (!tz
->flags
.cooling_mode
)
1015 if (copy_from_user(mode_string
, buffer
, count
))
1018 mode_string
[count
] = '\0';
1020 result
= acpi_thermal_set_cooling_mode(tz
,
1021 simple_strtoul(mode_string
, NULL
,
1026 acpi_thermal_check(tz
);
1031 static int acpi_thermal_polling_seq_show(struct seq_file
*seq
, void *offset
)
1033 struct acpi_thermal
*tz
= (struct acpi_thermal
*)seq
->private;
1039 if (!tz
->polling_frequency
) {
1040 seq_puts(seq
, "<polling disabled>\n");
1044 seq_printf(seq
, "polling frequency: %lu seconds\n",
1045 (tz
->polling_frequency
/ 10));
1051 static int acpi_thermal_polling_open_fs(struct inode
*inode
, struct file
*file
)
1053 return single_open(file
, acpi_thermal_polling_seq_show
,
1058 acpi_thermal_write_polling(struct file
*file
,
1059 const char __user
* buffer
,
1060 size_t count
, loff_t
* ppos
)
1062 struct seq_file
*m
= (struct seq_file
*)file
->private_data
;
1063 struct acpi_thermal
*tz
= (struct acpi_thermal
*)m
->private;
1065 char polling_string
[12] = { '\0' };
1069 if (!tz
|| (count
> sizeof(polling_string
) - 1))
1072 if (copy_from_user(polling_string
, buffer
, count
))
1075 polling_string
[count
] = '\0';
1077 seconds
= simple_strtoul(polling_string
, NULL
, 0);
1079 result
= acpi_thermal_set_polling(tz
, seconds
);
1083 acpi_thermal_check(tz
);
1088 static int acpi_thermal_add_fs(struct acpi_device
*device
)
1090 struct proc_dir_entry
*entry
= NULL
;
1093 if (!acpi_device_dir(device
)) {
1094 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
1096 if (!acpi_device_dir(device
))
1098 acpi_device_dir(device
)->owner
= THIS_MODULE
;
1102 entry
= create_proc_entry(ACPI_THERMAL_FILE_STATE
,
1103 S_IRUGO
, acpi_device_dir(device
));
1107 entry
->proc_fops
= &acpi_thermal_state_fops
;
1108 entry
->data
= acpi_driver_data(device
);
1109 entry
->owner
= THIS_MODULE
;
1112 /* 'temperature' [R] */
1113 entry
= create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE
,
1114 S_IRUGO
, acpi_device_dir(device
));
1118 entry
->proc_fops
= &acpi_thermal_temp_fops
;
1119 entry
->data
= acpi_driver_data(device
);
1120 entry
->owner
= THIS_MODULE
;
1123 /* 'trip_points' [R/W] */
1124 entry
= create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS
,
1125 S_IFREG
| S_IRUGO
| S_IWUSR
,
1126 acpi_device_dir(device
));
1130 entry
->proc_fops
= &acpi_thermal_trip_fops
;
1131 entry
->data
= acpi_driver_data(device
);
1132 entry
->owner
= THIS_MODULE
;
1135 /* 'cooling_mode' [R/W] */
1136 entry
= create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE
,
1137 S_IFREG
| S_IRUGO
| S_IWUSR
,
1138 acpi_device_dir(device
));
1142 entry
->proc_fops
= &acpi_thermal_cooling_fops
;
1143 entry
->data
= acpi_driver_data(device
);
1144 entry
->owner
= THIS_MODULE
;
1147 /* 'polling_frequency' [R/W] */
1148 entry
= create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ
,
1149 S_IFREG
| S_IRUGO
| S_IWUSR
,
1150 acpi_device_dir(device
));
1154 entry
->proc_fops
= &acpi_thermal_polling_fops
;
1155 entry
->data
= acpi_driver_data(device
);
1156 entry
->owner
= THIS_MODULE
;
1162 static int acpi_thermal_remove_fs(struct acpi_device
*device
)
1165 if (acpi_device_dir(device
)) {
1166 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ
,
1167 acpi_device_dir(device
));
1168 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE
,
1169 acpi_device_dir(device
));
1170 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS
,
1171 acpi_device_dir(device
));
1172 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE
,
1173 acpi_device_dir(device
));
1174 remove_proc_entry(ACPI_THERMAL_FILE_STATE
,
1175 acpi_device_dir(device
));
1176 remove_proc_entry(acpi_device_bid(device
), acpi_thermal_dir
);
1177 acpi_device_dir(device
) = NULL
;
1183 /* --------------------------------------------------------------------------
1185 -------------------------------------------------------------------------- */
1187 static void acpi_thermal_notify(acpi_handle handle
, u32 event
, void *data
)
1189 struct acpi_thermal
*tz
= (struct acpi_thermal
*)data
;
1190 struct acpi_device
*device
= NULL
;
1196 if (acpi_bus_get_device(tz
->handle
, &device
))
1200 case ACPI_THERMAL_NOTIFY_TEMPERATURE
:
1201 acpi_thermal_check(tz
);
1203 case ACPI_THERMAL_NOTIFY_THRESHOLDS
:
1204 acpi_thermal_get_trip_points(tz
);
1205 acpi_thermal_check(tz
);
1206 acpi_bus_generate_event(device
, event
, 0);
1208 case ACPI_THERMAL_NOTIFY_DEVICES
:
1209 if (tz
->flags
.devices
)
1210 acpi_thermal_get_devices(tz
);
1211 acpi_bus_generate_event(device
, event
, 0);
1214 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1215 "Unsupported event [0x%x]\n", event
));
1222 static int acpi_thermal_get_info(struct acpi_thermal
*tz
)
1230 /* Get temperature [_TMP] (required) */
1231 result
= acpi_thermal_get_temperature(tz
);
1235 /* Get trip points [_CRT, _PSV, etc.] (required) */
1236 result
= acpi_thermal_get_trip_points(tz
);
1240 /* Set the cooling mode [_SCP] to active cooling (default) */
1241 result
= acpi_thermal_set_cooling_mode(tz
, ACPI_THERMAL_MODE_ACTIVE
);
1243 tz
->flags
.cooling_mode
= 1;
1245 /* Oh,we have not _SCP method.
1246 Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1247 tz
->flags
.cooling_mode
= 0;
1248 if (tz
->trips
.active
[0].flags
.valid
1249 && tz
->trips
.passive
.flags
.valid
) {
1250 if (tz
->trips
.passive
.temperature
>
1251 tz
->trips
.active
[0].temperature
)
1252 tz
->cooling_mode
= ACPI_THERMAL_MODE_ACTIVE
;
1254 tz
->cooling_mode
= ACPI_THERMAL_MODE_PASSIVE
;
1255 } else if (!tz
->trips
.active
[0].flags
.valid
1256 && tz
->trips
.passive
.flags
.valid
) {
1257 tz
->cooling_mode
= ACPI_THERMAL_MODE_PASSIVE
;
1258 } else if (tz
->trips
.active
[0].flags
.valid
1259 && !tz
->trips
.passive
.flags
.valid
) {
1260 tz
->cooling_mode
= ACPI_THERMAL_MODE_ACTIVE
;
1262 /* _ACx and _PSV are optional, but _CRT is required */
1263 tz
->cooling_mode
= ACPI_THERMAL_MODE_CRITICAL
;
1267 /* Get default polling frequency [_TZP] (optional) */
1269 tz
->polling_frequency
= tzp
;
1271 acpi_thermal_get_polling_frequency(tz
);
1273 /* Get devices in this thermal zone [_TZD] (optional) */
1274 result
= acpi_thermal_get_devices(tz
);
1276 tz
->flags
.devices
= 1;
1281 static int acpi_thermal_add(struct acpi_device
*device
)
1284 acpi_status status
= AE_OK
;
1285 struct acpi_thermal
*tz
= NULL
;
1291 tz
= kmalloc(sizeof(struct acpi_thermal
), GFP_KERNEL
);
1294 memset(tz
, 0, sizeof(struct acpi_thermal
));
1296 tz
->handle
= device
->handle
;
1297 strcpy(tz
->name
, device
->pnp
.bus_id
);
1298 strcpy(acpi_device_name(device
), ACPI_THERMAL_DEVICE_NAME
);
1299 strcpy(acpi_device_class(device
), ACPI_THERMAL_CLASS
);
1300 acpi_driver_data(device
) = tz
;
1302 result
= acpi_thermal_get_info(tz
);
1306 result
= acpi_thermal_add_fs(device
);
1310 init_timer(&tz
->timer
);
1312 acpi_thermal_check(tz
);
1314 status
= acpi_install_notify_handler(tz
->handle
,
1316 acpi_thermal_notify
, tz
);
1317 if (ACPI_FAILURE(status
)) {
1322 printk(KERN_INFO PREFIX
"%s [%s] (%ld C)\n",
1323 acpi_device_name(device
), acpi_device_bid(device
),
1324 KELVIN_TO_CELSIUS(tz
->temperature
));
1328 acpi_thermal_remove_fs(device
);
1335 static int acpi_thermal_remove(struct acpi_device
*device
, int type
)
1337 acpi_status status
= AE_OK
;
1338 struct acpi_thermal
*tz
= NULL
;
1341 if (!device
|| !acpi_driver_data(device
))
1344 tz
= (struct acpi_thermal
*)acpi_driver_data(device
);
1346 /* avoid timer adding new defer task */
1348 /* wait for running timer (on other CPUs) finish */
1349 del_timer_sync(&(tz
->timer
));
1350 /* synchronize deferred task */
1351 acpi_os_wait_events_complete(NULL
);
1352 /* deferred task may reinsert timer */
1353 del_timer_sync(&(tz
->timer
));
1355 status
= acpi_remove_notify_handler(tz
->handle
,
1357 acpi_thermal_notify
);
1359 /* Terminate policy */
1360 if (tz
->trips
.passive
.flags
.valid
&& tz
->trips
.passive
.flags
.enabled
) {
1361 tz
->trips
.passive
.flags
.enabled
= 0;
1362 acpi_thermal_passive(tz
);
1364 if (tz
->trips
.active
[0].flags
.valid
1365 && tz
->trips
.active
[0].flags
.enabled
) {
1366 tz
->trips
.active
[0].flags
.enabled
= 0;
1367 acpi_thermal_active(tz
);
1370 acpi_thermal_remove_fs(device
);
1376 static int acpi_thermal_resume(struct acpi_device
*device
, int state
)
1378 struct acpi_thermal
*tz
= NULL
;
1380 if (!device
|| !acpi_driver_data(device
))
1383 tz
= (struct acpi_thermal
*)acpi_driver_data(device
);
1385 acpi_thermal_check(tz
);
1390 static int __init
acpi_thermal_init(void)
1395 acpi_thermal_dir
= proc_mkdir(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1396 if (!acpi_thermal_dir
)
1398 acpi_thermal_dir
->owner
= THIS_MODULE
;
1400 result
= acpi_bus_register_driver(&acpi_thermal_driver
);
1402 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1409 static void __exit
acpi_thermal_exit(void)
1412 acpi_bus_unregister_driver(&acpi_thermal_driver
);
1414 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1419 module_init(acpi_thermal_init
);
1420 module_exit(acpi_thermal_exit
);