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 <linux/reboot.h>
44 #include <asm/uaccess.h>
46 #include <acpi/acpi_bus.h>
47 #include <acpi/acpi_drivers.h>
49 #define ACPI_THERMAL_COMPONENT 0x04000000
50 #define ACPI_THERMAL_CLASS "thermal_zone"
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
64 #define ACPI_THERMAL_MAX_ACTIVE 10
65 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
67 #define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
68 #define CELSIUS_TO_KELVIN(t) ((t+273)*10)
70 #define _COMPONENT ACPI_THERMAL_COMPONENT
71 ACPI_MODULE_NAME("thermal");
73 MODULE_AUTHOR("Paul Diefenbaugh");
74 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
75 MODULE_LICENSE("GPL");
78 module_param(tzp
, int, 0);
79 MODULE_PARM_DESC(tzp
, "Thermal zone polling frequency, in 1/10 seconds.\n");
81 static int acpi_thermal_add(struct acpi_device
*device
);
82 static int acpi_thermal_remove(struct acpi_device
*device
, int type
);
83 static int acpi_thermal_resume(struct acpi_device
*device
);
84 static int acpi_thermal_state_open_fs(struct inode
*inode
, struct file
*file
);
85 static int acpi_thermal_temp_open_fs(struct inode
*inode
, struct file
*file
);
86 static int acpi_thermal_trip_open_fs(struct inode
*inode
, struct file
*file
);
87 static int acpi_thermal_cooling_open_fs(struct inode
*inode
, struct file
*file
);
88 static ssize_t
acpi_thermal_write_cooling_mode(struct file
*,
89 const char __user
*, size_t,
91 static int acpi_thermal_polling_open_fs(struct inode
*inode
, struct file
*file
);
92 static ssize_t
acpi_thermal_write_polling(struct file
*, const char __user
*,
95 static struct acpi_driver acpi_thermal_driver
= {
97 .class = ACPI_THERMAL_CLASS
,
98 .ids
= ACPI_THERMAL_HID
,
100 .add
= acpi_thermal_add
,
101 .remove
= acpi_thermal_remove
,
102 .resume
= acpi_thermal_resume
,
106 struct acpi_thermal_state
{
115 struct acpi_thermal_state_flags
{
121 struct acpi_thermal_critical
{
122 struct acpi_thermal_state_flags flags
;
123 unsigned long temperature
;
126 struct acpi_thermal_hot
{
127 struct acpi_thermal_state_flags flags
;
128 unsigned long temperature
;
131 struct acpi_thermal_passive
{
132 struct acpi_thermal_state_flags flags
;
133 unsigned long temperature
;
137 struct acpi_handle_list devices
;
140 struct acpi_thermal_active
{
141 struct acpi_thermal_state_flags flags
;
142 unsigned long temperature
;
143 struct acpi_handle_list devices
;
146 struct acpi_thermal_trips
{
147 struct acpi_thermal_critical critical
;
148 struct acpi_thermal_hot hot
;
149 struct acpi_thermal_passive passive
;
150 struct acpi_thermal_active active
[ACPI_THERMAL_MAX_ACTIVE
];
153 struct acpi_thermal_flags
{
154 u8 cooling_mode
:1; /* _SCP */
155 u8 devices
:1; /* _TZD */
159 struct acpi_thermal
{
160 struct acpi_device
* device
;
162 unsigned long temperature
;
163 unsigned long last_temperature
;
164 unsigned long polling_frequency
;
166 struct acpi_thermal_flags flags
;
167 struct acpi_thermal_state state
;
168 struct acpi_thermal_trips trips
;
169 struct acpi_handle_list devices
;
170 struct timer_list timer
;
173 static const struct file_operations acpi_thermal_state_fops
= {
174 .open
= acpi_thermal_state_open_fs
,
177 .release
= single_release
,
180 static const struct file_operations acpi_thermal_temp_fops
= {
181 .open
= acpi_thermal_temp_open_fs
,
184 .release
= single_release
,
187 static const struct file_operations acpi_thermal_trip_fops
= {
188 .open
= acpi_thermal_trip_open_fs
,
191 .release
= single_release
,
194 static const struct file_operations acpi_thermal_cooling_fops
= {
195 .open
= acpi_thermal_cooling_open_fs
,
197 .write
= acpi_thermal_write_cooling_mode
,
199 .release
= single_release
,
202 static const struct file_operations acpi_thermal_polling_fops
= {
203 .open
= acpi_thermal_polling_open_fs
,
205 .write
= acpi_thermal_write_polling
,
207 .release
= single_release
,
210 /* --------------------------------------------------------------------------
211 Thermal Zone Management
212 -------------------------------------------------------------------------- */
214 static int acpi_thermal_get_temperature(struct acpi_thermal
*tz
)
216 acpi_status status
= AE_OK
;
222 tz
->last_temperature
= tz
->temperature
;
225 acpi_evaluate_integer(tz
->device
->handle
, "_TMP", NULL
, &tz
->temperature
);
226 if (ACPI_FAILURE(status
))
229 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Temperature is %lu dK\n",
235 static int acpi_thermal_get_polling_frequency(struct acpi_thermal
*tz
)
237 acpi_status status
= AE_OK
;
244 acpi_evaluate_integer(tz
->device
->handle
, "_TZP", NULL
,
245 &tz
->polling_frequency
);
246 if (ACPI_FAILURE(status
))
249 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Polling frequency is %lu dS\n",
250 tz
->polling_frequency
));
255 static int acpi_thermal_set_polling(struct acpi_thermal
*tz
, int seconds
)
261 tz
->polling_frequency
= seconds
* 10; /* Convert value to deci-seconds */
263 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
264 "Polling frequency set to %lu seconds\n",
265 tz
->polling_frequency
/10));
270 static int acpi_thermal_set_cooling_mode(struct acpi_thermal
*tz
, int mode
)
272 acpi_status status
= AE_OK
;
273 union acpi_object arg0
= { ACPI_TYPE_INTEGER
};
274 struct acpi_object_list arg_list
= { 1, &arg0
};
275 acpi_handle handle
= NULL
;
281 status
= acpi_get_handle(tz
->device
->handle
, "_SCP", &handle
);
282 if (ACPI_FAILURE(status
)) {
283 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "_SCP not present\n"));
287 arg0
.integer
.value
= mode
;
289 status
= acpi_evaluate_object(handle
, NULL
, &arg_list
, NULL
);
290 if (ACPI_FAILURE(status
))
296 static int acpi_thermal_get_trip_points(struct acpi_thermal
*tz
)
298 acpi_status status
= AE_OK
;
305 /* Critical Shutdown (required) */
307 status
= acpi_evaluate_integer(tz
->device
->handle
, "_CRT", NULL
,
308 &tz
->trips
.critical
.temperature
);
309 if (ACPI_FAILURE(status
)) {
310 tz
->trips
.critical
.flags
.valid
= 0;
311 ACPI_EXCEPTION((AE_INFO
, status
, "No critical threshold"));
314 tz
->trips
.critical
.flags
.valid
= 1;
315 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
316 "Found critical threshold [%lu]\n",
317 tz
->trips
.critical
.temperature
));
320 /* Critical Sleep (optional) */
323 acpi_evaluate_integer(tz
->device
->handle
, "_HOT", NULL
,
324 &tz
->trips
.hot
.temperature
);
325 if (ACPI_FAILURE(status
)) {
326 tz
->trips
.hot
.flags
.valid
= 0;
327 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No hot threshold\n"));
329 tz
->trips
.hot
.flags
.valid
= 1;
330 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found hot threshold [%lu]\n",
331 tz
->trips
.hot
.temperature
));
334 /* Passive: Processors (optional) */
337 acpi_evaluate_integer(tz
->device
->handle
, "_PSV", NULL
,
338 &tz
->trips
.passive
.temperature
);
339 if (ACPI_FAILURE(status
)) {
340 tz
->trips
.passive
.flags
.valid
= 0;
341 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "No passive threshold\n"));
343 tz
->trips
.passive
.flags
.valid
= 1;
346 acpi_evaluate_integer(tz
->device
->handle
, "_TC1", NULL
,
347 &tz
->trips
.passive
.tc1
);
348 if (ACPI_FAILURE(status
))
349 tz
->trips
.passive
.flags
.valid
= 0;
352 acpi_evaluate_integer(tz
->device
->handle
, "_TC2", NULL
,
353 &tz
->trips
.passive
.tc2
);
354 if (ACPI_FAILURE(status
))
355 tz
->trips
.passive
.flags
.valid
= 0;
358 acpi_evaluate_integer(tz
->device
->handle
, "_TSP", NULL
,
359 &tz
->trips
.passive
.tsp
);
360 if (ACPI_FAILURE(status
))
361 tz
->trips
.passive
.flags
.valid
= 0;
364 acpi_evaluate_reference(tz
->device
->handle
, "_PSL", NULL
,
365 &tz
->trips
.passive
.devices
);
366 if (ACPI_FAILURE(status
))
367 tz
->trips
.passive
.flags
.valid
= 0;
369 if (!tz
->trips
.passive
.flags
.valid
)
370 printk(KERN_WARNING PREFIX
"Invalid passive threshold\n");
372 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
373 "Found passive threshold [%lu]\n",
374 tz
->trips
.passive
.temperature
));
377 /* Active: Fans, etc. (optional) */
379 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
381 char name
[5] = { '_', 'A', 'C', ('0' + i
), '\0' };
384 acpi_evaluate_integer(tz
->device
->handle
, name
, NULL
,
385 &tz
->trips
.active
[i
].temperature
);
386 if (ACPI_FAILURE(status
))
391 acpi_evaluate_reference(tz
->device
->handle
, name
, NULL
,
392 &tz
->trips
.active
[i
].devices
);
393 if (ACPI_SUCCESS(status
)) {
394 tz
->trips
.active
[i
].flags
.valid
= 1;
395 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
396 "Found active threshold [%d]:[%lu]\n",
397 i
, tz
->trips
.active
[i
].temperature
));
399 ACPI_EXCEPTION((AE_INFO
, status
,
400 "Invalid active threshold [%d]", i
));
406 static int acpi_thermal_get_devices(struct acpi_thermal
*tz
)
408 acpi_status status
= AE_OK
;
415 acpi_evaluate_reference(tz
->device
->handle
, "_TZD", NULL
, &tz
->devices
);
416 if (ACPI_FAILURE(status
))
422 static int acpi_thermal_critical(struct acpi_thermal
*tz
)
424 if (!tz
|| !tz
->trips
.critical
.flags
.valid
)
427 if (tz
->temperature
>= tz
->trips
.critical
.temperature
) {
428 printk(KERN_WARNING PREFIX
"Critical trip point\n");
429 tz
->trips
.critical
.flags
.enabled
= 1;
430 } else if (tz
->trips
.critical
.flags
.enabled
)
431 tz
->trips
.critical
.flags
.enabled
= 0;
434 "Critical temperature reached (%ld C), shutting down.\n",
435 KELVIN_TO_CELSIUS(tz
->temperature
));
436 acpi_bus_generate_event(tz
->device
, ACPI_THERMAL_NOTIFY_CRITICAL
,
437 tz
->trips
.critical
.flags
.enabled
);
439 orderly_poweroff(true);
444 static int acpi_thermal_hot(struct acpi_thermal
*tz
)
446 if (!tz
|| !tz
->trips
.hot
.flags
.valid
)
449 if (tz
->temperature
>= tz
->trips
.hot
.temperature
) {
450 printk(KERN_WARNING PREFIX
"Hot trip point\n");
451 tz
->trips
.hot
.flags
.enabled
= 1;
452 } else if (tz
->trips
.hot
.flags
.enabled
)
453 tz
->trips
.hot
.flags
.enabled
= 0;
455 acpi_bus_generate_event(tz
->device
, ACPI_THERMAL_NOTIFY_HOT
,
456 tz
->trips
.hot
.flags
.enabled
);
458 /* TBD: Call user-mode "sleep(S4)" function */
463 static void acpi_thermal_passive(struct acpi_thermal
*tz
)
466 struct acpi_thermal_passive
*passive
= NULL
;
471 if (!tz
|| !tz
->trips
.passive
.flags
.valid
)
474 passive
= &(tz
->trips
.passive
);
479 * Calculate the thermal trend (using the passive cooling equation)
480 * and modify the performance limit for all passive cooling devices
481 * accordingly. Note that we assume symmetry.
483 if (tz
->temperature
>= passive
->temperature
) {
485 (passive
->tc1
* (tz
->temperature
- tz
->last_temperature
)) +
486 (passive
->tc2
* (tz
->temperature
- passive
->temperature
));
487 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
488 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
489 trend
, passive
->tc1
, tz
->temperature
,
490 tz
->last_temperature
, passive
->tc2
,
491 tz
->temperature
, passive
->temperature
));
492 passive
->flags
.enabled
= 1;
495 for (i
= 0; i
< passive
->devices
.count
; i
++)
496 acpi_processor_set_thermal_limit(passive
->
499 ACPI_PROCESSOR_LIMIT_INCREMENT
);
501 else if (trend
< 0) {
502 for (i
= 0; i
< passive
->devices
.count
; i
++)
504 * assume that we are on highest
505 * freq/lowest thrott and can leave
506 * passive mode, even in error case
508 if (!acpi_processor_set_thermal_limit
509 (passive
->devices
.handles
[i
],
510 ACPI_PROCESSOR_LIMIT_DECREMENT
))
513 * Leave cooling mode, even if the temp might
514 * higher than trip point This is because some
515 * machines might have long thermal polling
516 * frequencies (tsp) defined. We will fall back
517 * into passive mode in next cycle (probably quicker)
520 passive
->flags
.enabled
= 0;
521 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
522 "Disabling passive cooling, still above threshold,"
523 " but we are cooling down\n"));
532 * Implement passive cooling hysteresis to slowly increase performance
533 * and avoid thrashing around the passive trip point. Note that we
536 if (!passive
->flags
.enabled
)
538 for (i
= 0; i
< passive
->devices
.count
; i
++)
539 if (!acpi_processor_set_thermal_limit
540 (passive
->devices
.handles
[i
],
541 ACPI_PROCESSOR_LIMIT_DECREMENT
))
544 passive
->flags
.enabled
= 0;
545 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
546 "Disabling passive cooling (zone is cool)\n"));
550 static void acpi_thermal_active(struct acpi_thermal
*tz
)
553 struct acpi_thermal_active
*active
= NULL
;
556 unsigned long maxtemp
= 0;
562 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
563 active
= &(tz
->trips
.active
[i
]);
564 if (!active
|| !active
->flags
.valid
)
566 if (tz
->temperature
>= active
->temperature
) {
570 * If not already enabled, turn ON all cooling devices
571 * associated with this active threshold.
573 if (active
->temperature
> maxtemp
)
574 tz
->state
.active_index
= i
;
575 maxtemp
= active
->temperature
;
576 if (active
->flags
.enabled
)
578 for (j
= 0; j
< active
->devices
.count
; j
++) {
580 acpi_bus_set_power(active
->devices
.
584 printk(KERN_WARNING PREFIX
585 "Unable to turn cooling device [%p] 'on'\n",
590 active
->flags
.enabled
= 1;
591 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
592 "Cooling device [%p] now 'on'\n",
593 active
->devices
.handles
[j
]));
597 if (!active
->flags
.enabled
)
602 * Turn OFF all cooling devices associated with this
605 for (j
= 0; j
< active
->devices
.count
; j
++) {
606 result
= acpi_bus_set_power(active
->devices
.handles
[j
],
609 printk(KERN_WARNING PREFIX
610 "Unable to turn cooling device [%p] 'off'\n",
611 active
->devices
.handles
[j
]);
614 active
->flags
.enabled
= 0;
615 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
616 "Cooling device [%p] now 'off'\n",
617 active
->devices
.handles
[j
]));
622 static void acpi_thermal_check(void *context
);
624 static void acpi_thermal_run(unsigned long data
)
626 struct acpi_thermal
*tz
= (struct acpi_thermal
*)data
;
628 acpi_os_execute(OSL_GPE_HANDLER
, acpi_thermal_check
, (void *)data
);
631 static void acpi_thermal_check(void *data
)
634 struct acpi_thermal
*tz
= data
;
635 unsigned long sleep_time
= 0;
637 struct acpi_thermal_state state
;
641 printk(KERN_ERR PREFIX
"Invalid (NULL) context\n");
647 result
= acpi_thermal_get_temperature(tz
);
651 memset(&tz
->state
, 0, sizeof(tz
->state
));
656 * Compare the current temperature to the trip point values to see
657 * if we've entered one of the thermal policy states. Note that
658 * this function determines when a state is entered, but the
659 * individual policy decides when it is exited (e.g. hysteresis).
661 if (tz
->trips
.critical
.flags
.valid
)
663 (tz
->temperature
>= tz
->trips
.critical
.temperature
);
664 if (tz
->trips
.hot
.flags
.valid
)
665 state
.hot
|= (tz
->temperature
>= tz
->trips
.hot
.temperature
);
666 if (tz
->trips
.passive
.flags
.valid
)
668 (tz
->temperature
>= tz
->trips
.passive
.temperature
);
669 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
670 if (tz
->trips
.active
[i
].flags
.valid
)
673 tz
->trips
.active
[i
].temperature
);
678 * Separated from the above check to allow individual policy to
679 * determine when to exit a given state.
682 acpi_thermal_critical(tz
);
684 acpi_thermal_hot(tz
);
686 acpi_thermal_passive(tz
);
688 acpi_thermal_active(tz
);
693 * Again, separated from the above two to allow independent policy
696 tz
->state
.critical
= tz
->trips
.critical
.flags
.enabled
;
697 tz
->state
.hot
= tz
->trips
.hot
.flags
.enabled
;
698 tz
->state
.passive
= tz
->trips
.passive
.flags
.enabled
;
699 tz
->state
.active
= 0;
700 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++)
701 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
704 * Calculate Sleep Time
705 * --------------------
706 * If we're in the passive state, use _TSP's value. Otherwise
707 * use the default polling frequency (e.g. _TZP). If no polling
708 * frequency is specified then we'll wait forever (at least until
709 * a thermal event occurs). Note that _TSP and _TZD values are
710 * given in 1/10th seconds (we must covert to milliseconds).
712 if (tz
->state
.passive
)
713 sleep_time
= tz
->trips
.passive
.tsp
* 100;
714 else if (tz
->polling_frequency
> 0)
715 sleep_time
= tz
->polling_frequency
* 100;
717 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "%s: temperature[%lu] sleep[%lu]\n",
718 tz
->name
, tz
->temperature
, sleep_time
));
725 if (timer_pending(&(tz
->timer
)))
726 del_timer(&(tz
->timer
));
728 if (timer_pending(&(tz
->timer
)))
729 mod_timer(&(tz
->timer
),
730 jiffies
+ (HZ
* sleep_time
) / 1000);
732 tz
->timer
.data
= (unsigned long)tz
;
733 tz
->timer
.function
= acpi_thermal_run
;
734 tz
->timer
.expires
= jiffies
+ (HZ
* sleep_time
) / 1000;
735 add_timer(&(tz
->timer
));
742 /* --------------------------------------------------------------------------
744 -------------------------------------------------------------------------- */
746 static struct proc_dir_entry
*acpi_thermal_dir
;
748 static int acpi_thermal_state_seq_show(struct seq_file
*seq
, void *offset
)
750 struct acpi_thermal
*tz
= seq
->private;
756 seq_puts(seq
, "state: ");
758 if (!tz
->state
.critical
&& !tz
->state
.hot
&& !tz
->state
.passive
759 && !tz
->state
.active
)
760 seq_puts(seq
, "ok\n");
762 if (tz
->state
.critical
)
763 seq_puts(seq
, "critical ");
765 seq_puts(seq
, "hot ");
766 if (tz
->state
.passive
)
767 seq_puts(seq
, "passive ");
768 if (tz
->state
.active
)
769 seq_printf(seq
, "active[%d]", tz
->state
.active_index
);
777 static int acpi_thermal_state_open_fs(struct inode
*inode
, struct file
*file
)
779 return single_open(file
, acpi_thermal_state_seq_show
, PDE(inode
)->data
);
782 static int acpi_thermal_temp_seq_show(struct seq_file
*seq
, void *offset
)
785 struct acpi_thermal
*tz
= seq
->private;
791 result
= acpi_thermal_get_temperature(tz
);
795 seq_printf(seq
, "temperature: %ld C\n",
796 KELVIN_TO_CELSIUS(tz
->temperature
));
802 static int acpi_thermal_temp_open_fs(struct inode
*inode
, struct file
*file
)
804 return single_open(file
, acpi_thermal_temp_seq_show
, PDE(inode
)->data
);
807 static int acpi_thermal_trip_seq_show(struct seq_file
*seq
, void *offset
)
809 struct acpi_thermal
*tz
= seq
->private;
810 struct acpi_device
*device
;
820 if (tz
->trips
.critical
.flags
.valid
)
821 seq_printf(seq
, "critical (S5): %ld C\n",
822 KELVIN_TO_CELSIUS(tz
->trips
.critical
.temperature
));
824 if (tz
->trips
.hot
.flags
.valid
)
825 seq_printf(seq
, "hot (S4): %ld C\n",
826 KELVIN_TO_CELSIUS(tz
->trips
.hot
.temperature
));
828 if (tz
->trips
.passive
.flags
.valid
) {
830 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
831 KELVIN_TO_CELSIUS(tz
->trips
.passive
.temperature
),
832 tz
->trips
.passive
.tc1
, tz
->trips
.passive
.tc2
,
833 tz
->trips
.passive
.tsp
);
834 for (j
= 0; j
< tz
->trips
.passive
.devices
.count
; j
++) {
835 status
= acpi_bus_get_device(tz
->trips
.passive
.devices
.
836 handles
[j
], &device
);
837 seq_printf(seq
, "%4.4s ", status
? "" :
838 acpi_device_bid(device
));
843 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
844 if (!(tz
->trips
.active
[i
].flags
.valid
))
846 seq_printf(seq
, "active[%d]: %ld C: devices=",
848 KELVIN_TO_CELSIUS(tz
->trips
.active
[i
].temperature
));
849 for (j
= 0; j
< tz
->trips
.active
[i
].devices
.count
; j
++){
850 status
= acpi_bus_get_device(tz
->trips
.active
[i
].
853 seq_printf(seq
, "%4.4s ", status
? "" :
854 acpi_device_bid(device
));
863 static int acpi_thermal_trip_open_fs(struct inode
*inode
, struct file
*file
)
865 return single_open(file
, acpi_thermal_trip_seq_show
, PDE(inode
)->data
);
868 static int acpi_thermal_cooling_seq_show(struct seq_file
*seq
, void *offset
)
870 struct acpi_thermal
*tz
= seq
->private;
876 if (!tz
->flags
.cooling_mode
)
877 seq_puts(seq
, "<setting not supported>\n");
879 seq_puts(seq
, "0 - Active; 1 - Passive\n");
885 static int acpi_thermal_cooling_open_fs(struct inode
*inode
, struct file
*file
)
887 return single_open(file
, acpi_thermal_cooling_seq_show
,
892 acpi_thermal_write_cooling_mode(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;
899 char mode_string
[12] = { '\0' };
902 if (!tz
|| (count
> sizeof(mode_string
) - 1))
905 if (!tz
->flags
.cooling_mode
)
908 if (copy_from_user(mode_string
, buffer
, count
))
911 mode_string
[count
] = '\0';
913 result
= acpi_thermal_set_cooling_mode(tz
,
914 simple_strtoul(mode_string
, NULL
,
919 acpi_thermal_check(tz
);
924 static int acpi_thermal_polling_seq_show(struct seq_file
*seq
, void *offset
)
926 struct acpi_thermal
*tz
= seq
->private;
932 if (!tz
->polling_frequency
) {
933 seq_puts(seq
, "<polling disabled>\n");
937 seq_printf(seq
, "polling frequency: %lu seconds\n",
938 (tz
->polling_frequency
/ 10));
944 static int acpi_thermal_polling_open_fs(struct inode
*inode
, struct file
*file
)
946 return single_open(file
, acpi_thermal_polling_seq_show
,
951 acpi_thermal_write_polling(struct file
*file
,
952 const char __user
* buffer
,
953 size_t count
, loff_t
* ppos
)
955 struct seq_file
*m
= file
->private_data
;
956 struct acpi_thermal
*tz
= m
->private;
958 char polling_string
[12] = { '\0' };
962 if (!tz
|| (count
> sizeof(polling_string
) - 1))
965 if (copy_from_user(polling_string
, buffer
, count
))
968 polling_string
[count
] = '\0';
970 seconds
= simple_strtoul(polling_string
, NULL
, 0);
972 result
= acpi_thermal_set_polling(tz
, seconds
);
976 acpi_thermal_check(tz
);
981 static int acpi_thermal_add_fs(struct acpi_device
*device
)
983 struct proc_dir_entry
*entry
= NULL
;
986 if (!acpi_device_dir(device
)) {
987 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
989 if (!acpi_device_dir(device
))
991 acpi_device_dir(device
)->owner
= THIS_MODULE
;
995 entry
= create_proc_entry(ACPI_THERMAL_FILE_STATE
,
996 S_IRUGO
, acpi_device_dir(device
));
1000 entry
->proc_fops
= &acpi_thermal_state_fops
;
1001 entry
->data
= acpi_driver_data(device
);
1002 entry
->owner
= THIS_MODULE
;
1005 /* 'temperature' [R] */
1006 entry
= create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE
,
1007 S_IRUGO
, acpi_device_dir(device
));
1011 entry
->proc_fops
= &acpi_thermal_temp_fops
;
1012 entry
->data
= acpi_driver_data(device
);
1013 entry
->owner
= THIS_MODULE
;
1016 /* 'trip_points' [R/W] */
1017 entry
= create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS
,
1018 S_IFREG
| S_IRUGO
| S_IWUSR
,
1019 acpi_device_dir(device
));
1023 entry
->proc_fops
= &acpi_thermal_trip_fops
;
1024 entry
->data
= acpi_driver_data(device
);
1025 entry
->owner
= THIS_MODULE
;
1028 /* 'cooling_mode' [R/W] */
1029 entry
= create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE
,
1030 S_IFREG
| S_IRUGO
| S_IWUSR
,
1031 acpi_device_dir(device
));
1035 entry
->proc_fops
= &acpi_thermal_cooling_fops
;
1036 entry
->data
= acpi_driver_data(device
);
1037 entry
->owner
= THIS_MODULE
;
1040 /* 'polling_frequency' [R/W] */
1041 entry
= create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ
,
1042 S_IFREG
| S_IRUGO
| S_IWUSR
,
1043 acpi_device_dir(device
));
1047 entry
->proc_fops
= &acpi_thermal_polling_fops
;
1048 entry
->data
= acpi_driver_data(device
);
1049 entry
->owner
= THIS_MODULE
;
1055 static int acpi_thermal_remove_fs(struct acpi_device
*device
)
1058 if (acpi_device_dir(device
)) {
1059 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ
,
1060 acpi_device_dir(device
));
1061 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE
,
1062 acpi_device_dir(device
));
1063 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS
,
1064 acpi_device_dir(device
));
1065 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE
,
1066 acpi_device_dir(device
));
1067 remove_proc_entry(ACPI_THERMAL_FILE_STATE
,
1068 acpi_device_dir(device
));
1069 remove_proc_entry(acpi_device_bid(device
), acpi_thermal_dir
);
1070 acpi_device_dir(device
) = NULL
;
1076 /* --------------------------------------------------------------------------
1078 -------------------------------------------------------------------------- */
1080 static void acpi_thermal_notify(acpi_handle handle
, u32 event
, void *data
)
1082 struct acpi_thermal
*tz
= data
;
1083 struct acpi_device
*device
= NULL
;
1089 device
= tz
->device
;
1092 case ACPI_THERMAL_NOTIFY_TEMPERATURE
:
1093 acpi_thermal_check(tz
);
1095 case ACPI_THERMAL_NOTIFY_THRESHOLDS
:
1096 acpi_thermal_get_trip_points(tz
);
1097 acpi_thermal_check(tz
);
1098 acpi_bus_generate_event(device
, event
, 0);
1100 case ACPI_THERMAL_NOTIFY_DEVICES
:
1101 if (tz
->flags
.devices
)
1102 acpi_thermal_get_devices(tz
);
1103 acpi_bus_generate_event(device
, event
, 0);
1106 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
1107 "Unsupported event [0x%x]\n", event
));
1114 static int acpi_thermal_get_info(struct acpi_thermal
*tz
)
1122 /* Get temperature [_TMP] (required) */
1123 result
= acpi_thermal_get_temperature(tz
);
1127 /* Get trip points [_CRT, _PSV, etc.] (required) */
1128 result
= acpi_thermal_get_trip_points(tz
);
1132 /* Set the cooling mode [_SCP] to active cooling (default) */
1133 result
= acpi_thermal_set_cooling_mode(tz
, ACPI_THERMAL_MODE_ACTIVE
);
1135 tz
->flags
.cooling_mode
= 1;
1137 /* Get default polling frequency [_TZP] (optional) */
1139 tz
->polling_frequency
= tzp
;
1141 acpi_thermal_get_polling_frequency(tz
);
1143 /* Get devices in this thermal zone [_TZD] (optional) */
1144 result
= acpi_thermal_get_devices(tz
);
1146 tz
->flags
.devices
= 1;
1151 static int acpi_thermal_add(struct acpi_device
*device
)
1154 acpi_status status
= AE_OK
;
1155 struct acpi_thermal
*tz
= NULL
;
1161 tz
= kzalloc(sizeof(struct acpi_thermal
), GFP_KERNEL
);
1165 tz
->device
= device
;
1166 strcpy(tz
->name
, device
->pnp
.bus_id
);
1167 strcpy(acpi_device_name(device
), ACPI_THERMAL_DEVICE_NAME
);
1168 strcpy(acpi_device_class(device
), ACPI_THERMAL_CLASS
);
1169 acpi_driver_data(device
) = tz
;
1171 result
= acpi_thermal_get_info(tz
);
1175 result
= acpi_thermal_add_fs(device
);
1179 init_timer(&tz
->timer
);
1181 acpi_thermal_check(tz
);
1183 status
= acpi_install_notify_handler(device
->handle
,
1185 acpi_thermal_notify
, tz
);
1186 if (ACPI_FAILURE(status
)) {
1191 printk(KERN_INFO PREFIX
"%s [%s] (%ld C)\n",
1192 acpi_device_name(device
), acpi_device_bid(device
),
1193 KELVIN_TO_CELSIUS(tz
->temperature
));
1197 acpi_thermal_remove_fs(device
);
1204 static int acpi_thermal_remove(struct acpi_device
*device
, int type
)
1206 acpi_status status
= AE_OK
;
1207 struct acpi_thermal
*tz
= NULL
;
1210 if (!device
|| !acpi_driver_data(device
))
1213 tz
= acpi_driver_data(device
);
1215 /* avoid timer adding new defer task */
1217 /* wait for running timer (on other CPUs) finish */
1218 del_timer_sync(&(tz
->timer
));
1219 /* synchronize deferred task */
1220 acpi_os_wait_events_complete(NULL
);
1221 /* deferred task may reinsert timer */
1222 del_timer_sync(&(tz
->timer
));
1224 status
= acpi_remove_notify_handler(device
->handle
,
1226 acpi_thermal_notify
);
1228 /* Terminate policy */
1229 if (tz
->trips
.passive
.flags
.valid
&& tz
->trips
.passive
.flags
.enabled
) {
1230 tz
->trips
.passive
.flags
.enabled
= 0;
1231 acpi_thermal_passive(tz
);
1233 if (tz
->trips
.active
[0].flags
.valid
1234 && tz
->trips
.active
[0].flags
.enabled
) {
1235 tz
->trips
.active
[0].flags
.enabled
= 0;
1236 acpi_thermal_active(tz
);
1239 acpi_thermal_remove_fs(device
);
1245 static int acpi_thermal_resume(struct acpi_device
*device
)
1247 struct acpi_thermal
*tz
= NULL
;
1248 int i
, j
, power_state
, result
;
1251 if (!device
|| !acpi_driver_data(device
))
1254 tz
= acpi_driver_data(device
);
1256 for (i
= 0; i
< ACPI_THERMAL_MAX_ACTIVE
; i
++) {
1257 if (!(&tz
->trips
.active
[i
]))
1259 if (!tz
->trips
.active
[i
].flags
.valid
)
1261 tz
->trips
.active
[i
].flags
.enabled
= 1;
1262 for (j
= 0; j
< tz
->trips
.active
[i
].devices
.count
; j
++) {
1263 result
= acpi_bus_get_power(tz
->trips
.active
[i
].devices
.
1264 handles
[j
], &power_state
);
1265 if (result
|| (power_state
!= ACPI_STATE_D0
)) {
1266 tz
->trips
.active
[i
].flags
.enabled
= 0;
1270 tz
->state
.active
|= tz
->trips
.active
[i
].flags
.enabled
;
1273 acpi_thermal_check(tz
);
1278 static int __init
acpi_thermal_init(void)
1283 acpi_thermal_dir
= proc_mkdir(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1284 if (!acpi_thermal_dir
)
1286 acpi_thermal_dir
->owner
= THIS_MODULE
;
1288 result
= acpi_bus_register_driver(&acpi_thermal_driver
);
1290 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1297 static void __exit
acpi_thermal_exit(void)
1300 acpi_bus_unregister_driver(&acpi_thermal_driver
);
1302 remove_proc_entry(ACPI_THERMAL_CLASS
, acpi_root_dir
);
1307 module_init(acpi_thermal_init
);
1308 module_exit(acpi_thermal_exit
);