2 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 * This driver fully implements the ACPI thermal policy as described in the
26 * ACPI 2.0 Specification.
28 * TBD: 1. Implement passive cooling hysteresis.
29 * 2. Enhance passive cooling (CPU) states/limit interface to support
30 * concepts of 'multiple limiters', upper/lower limits, etc.
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/types.h>
38 #include <linux/proc_fs.h>
39 #include <linux/timer.h>
40 #include <linux/jiffies.h>
41 #include <linux/kmod.h>
42 #include <linux/seq_file.h>
43 #include <asm/uaccess.h>
45 #include <acpi/acpi_bus.h>
46 #include <acpi/acpi_drivers.h>
48 #define ACPI_THERMAL_COMPONENT 0x04000000
49 #define ACPI_THERMAL_CLASS "thermal_zone"
50 #define ACPI_THERMAL_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("thermal");
75 MODULE_AUTHOR("Paul Diefenbaugh");
76 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
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);
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 = {
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/10));
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),
762 jiffies + (HZ * sleep_time) / 1000);
764 tz->timer.data = (unsigned long)tz;
765 tz->timer.function = acpi_thermal_run;
766 tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
767 add_timer(&(tz->timer));
774 /* --------------------------------------------------------------------------
776 -------------------------------------------------------------------------- */
778 static struct proc_dir_entry *acpi_thermal_dir;
780 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
782 struct acpi_thermal *tz = seq->private;
788 seq_puts(seq, "state: ");
790 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
791 && !tz->state.active)
792 seq_puts(seq, "ok\n");
794 if (tz->state.critical)
795 seq_puts(seq, "critical ");
797 seq_puts(seq, "hot ");
798 if (tz->state.passive)
799 seq_puts(seq, "passive ");
800 if (tz->state.active)
801 seq_printf(seq, "active[%d]", tz->state.active_index);
809 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
811 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
814 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
817 struct acpi_thermal *tz = seq->private;
823 result = acpi_thermal_get_temperature(tz);
827 seq_printf(seq, "temperature: %ld C\n",
828 KELVIN_TO_CELSIUS(tz->temperature));
834 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
836 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
839 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
841 struct acpi_thermal *tz = seq->private;
849 if (tz->trips.critical.flags.valid)
850 seq_printf(seq, "critical (S5): %ld C\n",
851 KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
853 if (tz->trips.hot.flags.valid)
854 seq_printf(seq, "hot (S4): %ld C\n",
855 KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
857 if (tz->trips.passive.flags.valid) {
859 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
860 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
861 tz->trips.passive.tc1, tz->trips.passive.tc2,
862 tz->trips.passive.tsp);
863 for (j = 0; j < tz->trips.passive.devices.count; j++) {
865 seq_printf(seq, "0x%p ",
866 tz->trips.passive.devices.handles[j]);
871 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
872 if (!(tz->trips.active[i].flags.valid))
874 seq_printf(seq, "active[%d]: %ld C: devices=",
876 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
877 for (j = 0; j < tz->trips.active[i].devices.count; j++)
878 seq_printf(seq, "0x%p ",
879 tz->trips.active[i].devices.handles[j]);
887 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
889 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
893 acpi_thermal_write_trip_points(struct file *file,
894 const char __user * buffer,
895 size_t count, loff_t * ppos)
897 struct seq_file *m = file->private_data;
898 struct acpi_thermal *tz = m->private;
901 int num, critical, hot, passive;
906 limit_string = kzalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
910 active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
916 if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
921 if (copy_from_user(limit_string, buffer, count)) {
926 limit_string[count] = '\0';
928 num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
929 &critical, &hot, &passive,
930 &active[0], &active[1], &active[2], &active[3], &active[4],
931 &active[5], &active[6], &active[7], &active[8],
933 if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
938 tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
939 tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
940 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
941 for (i = 0; i < num - 3; i++) {
942 if (!(tz->trips.active[i].flags.valid))
944 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
953 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
955 struct acpi_thermal *tz = seq->private;
961 if (!tz->flags.cooling_mode) {
962 seq_puts(seq, "<setting not supported>\n");
965 if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
966 seq_printf(seq, "cooling mode: critical\n");
968 seq_printf(seq, "cooling mode: %s\n",
969 tz->cooling_mode ? "passive" : "active");
975 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
977 return single_open(file, acpi_thermal_cooling_seq_show,
982 acpi_thermal_write_cooling_mode(struct file *file,
983 const char __user * buffer,
984 size_t count, loff_t * ppos)
986 struct seq_file *m = file->private_data;
987 struct acpi_thermal *tz = m->private;
989 char mode_string[12] = { '\0' };
992 if (!tz || (count > sizeof(mode_string) - 1))
995 if (!tz->flags.cooling_mode)
998 if (copy_from_user(mode_string, buffer, count))
1001 mode_string[count] = '\0';
1003 result = acpi_thermal_set_cooling_mode(tz,
1004 simple_strtoul(mode_string, NULL,
1009 acpi_thermal_check(tz);
1014 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1016 struct acpi_thermal *tz = seq->private;
1022 if (!tz->polling_frequency) {
1023 seq_puts(seq, "<polling disabled>\n");
1027 seq_printf(seq, "polling frequency: %lu seconds\n",
1028 (tz->polling_frequency / 10));
1034 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1036 return single_open(file, acpi_thermal_polling_seq_show,
1041 acpi_thermal_write_polling(struct file *file,
1042 const char __user * buffer,
1043 size_t count, loff_t * ppos)
1045 struct seq_file *m = file->private_data;
1046 struct acpi_thermal *tz = m->private;
1048 char polling_string[12] = { '\0' };
1052 if (!tz || (count > sizeof(polling_string) - 1))
1055 if (copy_from_user(polling_string, buffer, count))
1058 polling_string[count] = '\0';
1060 seconds = simple_strtoul(polling_string, NULL, 0);
1062 result = acpi_thermal_set_polling(tz, seconds);
1066 acpi_thermal_check(tz);
1071 static int acpi_thermal_add_fs(struct acpi_device *device)
1073 struct proc_dir_entry *entry = NULL;
1076 if (!acpi_device_dir(device)) {
1077 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1079 if (!acpi_device_dir(device))
1081 acpi_device_dir(device)->owner = THIS_MODULE;
1085 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1086 S_IRUGO, acpi_device_dir(device));
1090 entry->proc_fops = &acpi_thermal_state_fops;
1091 entry->data = acpi_driver_data(device);
1092 entry->owner = THIS_MODULE;
1095 /* 'temperature' [R] */
1096 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1097 S_IRUGO, acpi_device_dir(device));
1101 entry->proc_fops = &acpi_thermal_temp_fops;
1102 entry->data = acpi_driver_data(device);
1103 entry->owner = THIS_MODULE;
1106 /* 'trip_points' [R/W] */
1107 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1108 S_IFREG | S_IRUGO | S_IWUSR,
1109 acpi_device_dir(device));
1113 entry->proc_fops = &acpi_thermal_trip_fops;
1114 entry->data = acpi_driver_data(device);
1115 entry->owner = THIS_MODULE;
1118 /* 'cooling_mode' [R/W] */
1119 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1120 S_IFREG | S_IRUGO | S_IWUSR,
1121 acpi_device_dir(device));
1125 entry->proc_fops = &acpi_thermal_cooling_fops;
1126 entry->data = acpi_driver_data(device);
1127 entry->owner = THIS_MODULE;
1130 /* 'polling_frequency' [R/W] */
1131 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1132 S_IFREG | S_IRUGO | S_IWUSR,
1133 acpi_device_dir(device));
1137 entry->proc_fops = &acpi_thermal_polling_fops;
1138 entry->data = acpi_driver_data(device);
1139 entry->owner = THIS_MODULE;
1145 static int acpi_thermal_remove_fs(struct acpi_device *device)
1148 if (acpi_device_dir(device)) {
1149 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1150 acpi_device_dir(device));
1151 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1152 acpi_device_dir(device));
1153 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1154 acpi_device_dir(device));
1155 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1156 acpi_device_dir(device));
1157 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1158 acpi_device_dir(device));
1159 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1160 acpi_device_dir(device) = NULL;
1166 /* --------------------------------------------------------------------------
1168 -------------------------------------------------------------------------- */
1170 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1172 struct acpi_thermal *tz = data;
1173 struct acpi_device *device = NULL;
1179 device = tz->device;
1182 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1183 acpi_thermal_check(tz);
1185 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1186 acpi_thermal_get_trip_points(tz);
1187 acpi_thermal_check(tz);
1188 acpi_bus_generate_event(device, event, 0);
1190 case ACPI_THERMAL_NOTIFY_DEVICES:
1191 if (tz->flags.devices)
1192 acpi_thermal_get_devices(tz);
1193 acpi_bus_generate_event(device, event, 0);
1196 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1197 "Unsupported event [0x%x]\n", event));
1204 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1212 /* Get temperature [_TMP] (required) */
1213 result = acpi_thermal_get_temperature(tz);
1217 /* Get trip points [_CRT, _PSV, etc.] (required) */
1218 result = acpi_thermal_get_trip_points(tz);
1222 /* Set the cooling mode [_SCP] to active cooling (default) */
1223 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1225 tz->flags.cooling_mode = 1;
1227 /* Oh,we have not _SCP method.
1228 Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1229 tz->flags.cooling_mode = 0;
1230 if (tz->trips.active[0].flags.valid
1231 && tz->trips.passive.flags.valid) {
1232 if (tz->trips.passive.temperature >
1233 tz->trips.active[0].temperature)
1234 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1236 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1237 } else if (!tz->trips.active[0].flags.valid
1238 && tz->trips.passive.flags.valid) {
1239 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1240 } else if (tz->trips.active[0].flags.valid
1241 && !tz->trips.passive.flags.valid) {
1242 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1244 /* _ACx and _PSV are optional, but _CRT is required */
1245 tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1249 /* Get default polling frequency [_TZP] (optional) */
1251 tz->polling_frequency = tzp;
1253 acpi_thermal_get_polling_frequency(tz);
1255 /* Get devices in this thermal zone [_TZD] (optional) */
1256 result = acpi_thermal_get_devices(tz);
1258 tz->flags.devices = 1;
1263 static int acpi_thermal_add(struct acpi_device *device)
1266 acpi_status status = AE_OK;
1267 struct acpi_thermal *tz = NULL;
1273 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1277 tz->device = device;
1278 strcpy(tz->name, device->pnp.bus_id);
1279 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1280 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1281 acpi_driver_data(device) = tz;
1283 result = acpi_thermal_get_info(tz);
1287 result = acpi_thermal_add_fs(device);
1291 init_timer(&tz->timer);
1293 acpi_thermal_check(tz);
1295 status = acpi_install_notify_handler(device->handle,
1297 acpi_thermal_notify, tz);
1298 if (ACPI_FAILURE(status)) {
1303 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1304 acpi_device_name(device), acpi_device_bid(device),
1305 KELVIN_TO_CELSIUS(tz->temperature));
1309 acpi_thermal_remove_fs(device);
1316 static int acpi_thermal_remove(struct acpi_device *device, int type)
1318 acpi_status status = AE_OK;
1319 struct acpi_thermal *tz = NULL;
1322 if (!device || !acpi_driver_data(device))
1325 tz = acpi_driver_data(device);
1327 /* avoid timer adding new defer task */
1329 /* wait for running timer (on other CPUs) finish */
1330 del_timer_sync(&(tz->timer));
1331 /* synchronize deferred task */
1332 acpi_os_wait_events_complete(NULL);
1333 /* deferred task may reinsert timer */
1334 del_timer_sync(&(tz->timer));
1336 status = acpi_remove_notify_handler(device->handle,
1338 acpi_thermal_notify);
1340 /* Terminate policy */
1341 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1342 tz->trips.passive.flags.enabled = 0;
1343 acpi_thermal_passive(tz);
1345 if (tz->trips.active[0].flags.valid
1346 && tz->trips.active[0].flags.enabled) {
1347 tz->trips.active[0].flags.enabled = 0;
1348 acpi_thermal_active(tz);
1351 acpi_thermal_remove_fs(device);
1357 static int acpi_thermal_resume(struct acpi_device *device)
1359 struct acpi_thermal *tz = NULL;
1360 int i, j, power_state, result;
1363 if (!device || !acpi_driver_data(device))
1366 tz = acpi_driver_data(device);
1368 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1369 if (!(&tz->trips.active[i]))
1371 if (!tz->trips.active[i].flags.valid)
1373 tz->trips.active[i].flags.enabled = 1;
1374 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1375 result = acpi_bus_get_power(tz->trips.active[i].devices.
1376 handles[j], &power_state);
1377 if (result || (power_state != ACPI_STATE_D0)) {
1378 tz->trips.active[i].flags.enabled = 0;
1382 tz->state.active |= tz->trips.active[i].flags.enabled;
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);