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_DEVICE_NAME "Thermal Zone"
50 #define ACPI_THERMAL_FILE_STATE "state"
51 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
52 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
53 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
54 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
55 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
56 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
57 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82
58 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
59 #define ACPI_THERMAL_NOTIFY_HOT 0xF1
60 #define ACPI_THERMAL_MODE_ACTIVE 0x00
61 #define ACPI_THERMAL_MODE_PASSIVE 0x01
62 #define ACPI_THERMAL_MODE_CRITICAL 0xff
63 #define ACPI_THERMAL_PATH_POWEROFF "/sbin/poweroff"
65 #define ACPI_THERMAL_MAX_ACTIVE 10
66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
68 #define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
69 #define CELSIUS_TO_KELVIN(t) ((t+273)*10)
71 #define _COMPONENT ACPI_THERMAL_COMPONENT
72 ACPI_MODULE_NAME("thermal");
74 MODULE_AUTHOR("Paul Diefenbaugh");
75 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
76 MODULE_LICENSE("GPL");
79 module_param(tzp, int, 0);
80 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
82 static int acpi_thermal_add(struct acpi_device *device);
83 static int acpi_thermal_remove(struct acpi_device *device, int type);
84 static int acpi_thermal_resume(struct acpi_device *device);
85 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
86 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
87 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
88 static ssize_t acpi_thermal_write_trip_points(struct file *,
89 const char __user *, size_t,
91 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
92 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
93 const char __user *, size_t,
95 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
96 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
99 static struct acpi_driver acpi_thermal_driver = {
101 .class = ACPI_THERMAL_CLASS,
102 .ids = ACPI_THERMAL_HID,
104 .add = acpi_thermal_add,
105 .remove = acpi_thermal_remove,
106 .resume = acpi_thermal_resume,
110 struct acpi_thermal_state {
119 struct acpi_thermal_state_flags {
125 struct acpi_thermal_critical {
126 struct acpi_thermal_state_flags flags;
127 unsigned long temperature;
130 struct acpi_thermal_hot {
131 struct acpi_thermal_state_flags flags;
132 unsigned long temperature;
135 struct acpi_thermal_passive {
136 struct acpi_thermal_state_flags flags;
137 unsigned long temperature;
141 struct acpi_handle_list devices;
144 struct acpi_thermal_active {
145 struct acpi_thermal_state_flags flags;
146 unsigned long temperature;
147 struct acpi_handle_list devices;
150 struct acpi_thermal_trips {
151 struct acpi_thermal_critical critical;
152 struct acpi_thermal_hot hot;
153 struct acpi_thermal_passive passive;
154 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
157 struct acpi_thermal_flags {
158 u8 cooling_mode:1; /* _SCP */
159 u8 devices:1; /* _TZD */
163 struct acpi_thermal {
164 struct acpi_device * device;
166 unsigned long temperature;
167 unsigned long last_temperature;
168 unsigned long polling_frequency;
171 struct acpi_thermal_flags flags;
172 struct acpi_thermal_state state;
173 struct acpi_thermal_trips trips;
174 struct acpi_handle_list devices;
175 struct timer_list timer;
178 static const struct file_operations acpi_thermal_state_fops = {
179 .open = acpi_thermal_state_open_fs,
182 .release = single_release,
185 static const struct file_operations acpi_thermal_temp_fops = {
186 .open = acpi_thermal_temp_open_fs,
189 .release = single_release,
192 static const struct file_operations acpi_thermal_trip_fops = {
193 .open = acpi_thermal_trip_open_fs,
195 .write = acpi_thermal_write_trip_points,
197 .release = single_release,
200 static const struct file_operations acpi_thermal_cooling_fops = {
201 .open = acpi_thermal_cooling_open_fs,
203 .write = acpi_thermal_write_cooling_mode,
205 .release = single_release,
208 static const struct file_operations acpi_thermal_polling_fops = {
209 .open = acpi_thermal_polling_open_fs,
211 .write = acpi_thermal_write_polling,
213 .release = single_release,
216 /* --------------------------------------------------------------------------
217 Thermal Zone Management
218 -------------------------------------------------------------------------- */
220 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
222 acpi_status status = AE_OK;
228 tz->last_temperature = tz->temperature;
231 acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
232 if (ACPI_FAILURE(status))
235 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
241 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
243 acpi_status status = AE_OK;
250 acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
251 &tz->polling_frequency);
252 if (ACPI_FAILURE(status))
255 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
256 tz->polling_frequency));
261 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
267 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */
269 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
270 "Polling frequency set to %lu seconds\n",
271 tz->polling_frequency));
276 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
278 acpi_status status = AE_OK;
279 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
280 struct acpi_object_list arg_list = { 1, &arg0 };
281 acpi_handle handle = NULL;
287 status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
288 if (ACPI_FAILURE(status)) {
289 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
293 arg0.integer.value = mode;
295 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
296 if (ACPI_FAILURE(status))
299 tz->cooling_mode = mode;
301 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
302 mode ? "passive" : "active"));
307 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
309 acpi_status status = AE_OK;
316 /* Critical Shutdown (required) */
318 status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
319 &tz->trips.critical.temperature);
320 if (ACPI_FAILURE(status)) {
321 tz->trips.critical.flags.valid = 0;
322 ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
325 tz->trips.critical.flags.valid = 1;
326 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
327 "Found critical threshold [%lu]\n",
328 tz->trips.critical.temperature));
331 /* Critical Sleep (optional) */
334 acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
335 &tz->trips.hot.temperature);
336 if (ACPI_FAILURE(status)) {
337 tz->trips.hot.flags.valid = 0;
338 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
340 tz->trips.hot.flags.valid = 1;
341 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
342 tz->trips.hot.temperature));
345 /* Passive: Processors (optional) */
348 acpi_evaluate_integer(tz->device->handle, "_PSV", NULL,
349 &tz->trips.passive.temperature);
350 if (ACPI_FAILURE(status)) {
351 tz->trips.passive.flags.valid = 0;
352 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
354 tz->trips.passive.flags.valid = 1;
357 acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
358 &tz->trips.passive.tc1);
359 if (ACPI_FAILURE(status))
360 tz->trips.passive.flags.valid = 0;
363 acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
364 &tz->trips.passive.tc2);
365 if (ACPI_FAILURE(status))
366 tz->trips.passive.flags.valid = 0;
369 acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
370 &tz->trips.passive.tsp);
371 if (ACPI_FAILURE(status))
372 tz->trips.passive.flags.valid = 0;
375 acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
376 &tz->trips.passive.devices);
377 if (ACPI_FAILURE(status))
378 tz->trips.passive.flags.valid = 0;
380 if (!tz->trips.passive.flags.valid)
381 printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
383 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
384 "Found passive threshold [%lu]\n",
385 tz->trips.passive.temperature));
388 /* Active: Fans, etc. (optional) */
390 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
392 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
395 acpi_evaluate_integer(tz->device->handle, name, NULL,
396 &tz->trips.active[i].temperature);
397 if (ACPI_FAILURE(status))
402 acpi_evaluate_reference(tz->device->handle, name, NULL,
403 &tz->trips.active[i].devices);
404 if (ACPI_SUCCESS(status)) {
405 tz->trips.active[i].flags.valid = 1;
406 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
407 "Found active threshold [%d]:[%lu]\n",
408 i, tz->trips.active[i].temperature));
410 ACPI_EXCEPTION((AE_INFO, status,
411 "Invalid active threshold [%d]", i));
417 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
419 acpi_status status = AE_OK;
426 acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
427 if (ACPI_FAILURE(status))
433 static int acpi_thermal_call_usermode(char *path)
435 char *argv[2] = { NULL, NULL };
436 char *envp[3] = { NULL, NULL, NULL };
444 /* minimal command environment */
446 envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
448 call_usermodehelper(argv[0], argv, envp, 0);
453 static int acpi_thermal_critical(struct acpi_thermal *tz)
455 if (!tz || !tz->trips.critical.flags.valid)
458 if (tz->temperature >= tz->trips.critical.temperature) {
459 printk(KERN_WARNING PREFIX "Critical trip point\n");
460 tz->trips.critical.flags.enabled = 1;
461 } else if (tz->trips.critical.flags.enabled)
462 tz->trips.critical.flags.enabled = 0;
465 "Critical temperature reached (%ld C), shutting down.\n",
466 KELVIN_TO_CELSIUS(tz->temperature));
467 acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
468 tz->trips.critical.flags.enabled);
470 acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
475 static int acpi_thermal_hot(struct acpi_thermal *tz)
477 if (!tz || !tz->trips.hot.flags.valid)
480 if (tz->temperature >= tz->trips.hot.temperature) {
481 printk(KERN_WARNING PREFIX "Hot trip point\n");
482 tz->trips.hot.flags.enabled = 1;
483 } else if (tz->trips.hot.flags.enabled)
484 tz->trips.hot.flags.enabled = 0;
486 acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
487 tz->trips.hot.flags.enabled);
489 /* TBD: Call user-mode "sleep(S4)" function */
494 static void acpi_thermal_passive(struct acpi_thermal *tz)
497 struct acpi_thermal_passive *passive = NULL;
502 if (!tz || !tz->trips.passive.flags.valid)
505 passive = &(tz->trips.passive);
510 * Calculate the thermal trend (using the passive cooling equation)
511 * and modify the performance limit for all passive cooling devices
512 * accordingly. Note that we assume symmetry.
514 if (tz->temperature >= passive->temperature) {
516 (passive->tc1 * (tz->temperature - tz->last_temperature)) +
517 (passive->tc2 * (tz->temperature - passive->temperature));
518 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
519 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
520 trend, passive->tc1, tz->temperature,
521 tz->last_temperature, passive->tc2,
522 tz->temperature, passive->temperature));
523 passive->flags.enabled = 1;
526 for (i = 0; i < passive->devices.count; i++)
527 acpi_processor_set_thermal_limit(passive->
530 ACPI_PROCESSOR_LIMIT_INCREMENT);
532 else if (trend < 0) {
533 for (i = 0; i < passive->devices.count; i++)
535 * assume that we are on highest
536 * freq/lowest thrott and can leave
537 * passive mode, even in error case
539 if (!acpi_processor_set_thermal_limit
540 (passive->devices.handles[i],
541 ACPI_PROCESSOR_LIMIT_DECREMENT))
544 * Leave cooling mode, even if the temp might
545 * higher than trip point This is because some
546 * machines might have long thermal polling
547 * frequencies (tsp) defined. We will fall back
548 * into passive mode in next cycle (probably quicker)
551 passive->flags.enabled = 0;
552 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
553 "Disabling passive cooling, still above threshold,"
554 " but we are cooling down\n"));
563 * Implement passive cooling hysteresis to slowly increase performance
564 * and avoid thrashing around the passive trip point. Note that we
567 if (!passive->flags.enabled)
569 for (i = 0; i < passive->devices.count; i++)
570 if (!acpi_processor_set_thermal_limit
571 (passive->devices.handles[i],
572 ACPI_PROCESSOR_LIMIT_DECREMENT))
575 passive->flags.enabled = 0;
576 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
577 "Disabling passive cooling (zone is cool)\n"));
581 static void acpi_thermal_active(struct acpi_thermal *tz)
584 struct acpi_thermal_active *active = NULL;
587 unsigned long maxtemp = 0;
593 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
594 active = &(tz->trips.active[i]);
595 if (!active || !active->flags.valid)
597 if (tz->temperature >= active->temperature) {
601 * If not already enabled, turn ON all cooling devices
602 * associated with this active threshold.
604 if (active->temperature > maxtemp)
605 tz->state.active_index = i;
606 maxtemp = active->temperature;
607 if (active->flags.enabled)
609 for (j = 0; j < active->devices.count; j++) {
611 acpi_bus_set_power(active->devices.
615 printk(KERN_WARNING PREFIX
616 "Unable to turn cooling device [%p] 'on'\n",
621 active->flags.enabled = 1;
622 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
623 "Cooling device [%p] now 'on'\n",
624 active->devices.handles[j]));
628 if (!active->flags.enabled)
633 * Turn OFF all cooling devices associated with this
636 for (j = 0; j < active->devices.count; j++) {
637 result = acpi_bus_set_power(active->devices.handles[j],
640 printk(KERN_WARNING PREFIX
641 "Unable to turn cooling device [%p] 'off'\n",
642 active->devices.handles[j]);
645 active->flags.enabled = 0;
646 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
647 "Cooling device [%p] now 'off'\n",
648 active->devices.handles[j]));
653 static void acpi_thermal_check(void *context);
655 static void acpi_thermal_run(unsigned long data)
657 struct acpi_thermal *tz = (struct acpi_thermal *)data;
659 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
662 static void acpi_thermal_check(void *data)
665 struct acpi_thermal *tz = data;
666 unsigned long sleep_time = 0;
668 struct acpi_thermal_state state;
672 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
678 result = acpi_thermal_get_temperature(tz);
682 memset(&tz->state, 0, sizeof(tz->state));
687 * Compare the current temperature to the trip point values to see
688 * if we've entered one of the thermal policy states. Note that
689 * this function determines when a state is entered, but the
690 * individual policy decides when it is exited (e.g. hysteresis).
692 if (tz->trips.critical.flags.valid)
694 (tz->temperature >= tz->trips.critical.temperature);
695 if (tz->trips.hot.flags.valid)
696 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
697 if (tz->trips.passive.flags.valid)
699 (tz->temperature >= tz->trips.passive.temperature);
700 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
701 if (tz->trips.active[i].flags.valid)
704 tz->trips.active[i].temperature);
709 * Separated from the above check to allow individual policy to
710 * determine when to exit a given state.
713 acpi_thermal_critical(tz);
715 acpi_thermal_hot(tz);
717 acpi_thermal_passive(tz);
719 acpi_thermal_active(tz);
724 * Again, separated from the above two to allow independent policy
727 tz->state.critical = tz->trips.critical.flags.enabled;
728 tz->state.hot = tz->trips.hot.flags.enabled;
729 tz->state.passive = tz->trips.passive.flags.enabled;
730 tz->state.active = 0;
731 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
732 tz->state.active |= tz->trips.active[i].flags.enabled;
735 * Calculate Sleep Time
736 * --------------------
737 * If we're in the passive state, use _TSP's value. Otherwise
738 * use the default polling frequency (e.g. _TZP). If no polling
739 * frequency is specified then we'll wait forever (at least until
740 * a thermal event occurs). Note that _TSP and _TZD values are
741 * given in 1/10th seconds (we must covert to milliseconds).
743 if (tz->state.passive)
744 sleep_time = tz->trips.passive.tsp * 100;
745 else if (tz->polling_frequency > 0)
746 sleep_time = tz->polling_frequency * 100;
748 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
749 tz->name, tz->temperature, sleep_time));
756 if (timer_pending(&(tz->timer)))
757 del_timer(&(tz->timer));
759 if (timer_pending(&(tz->timer)))
760 mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
762 tz->timer.data = (unsigned long)tz;
763 tz->timer.function = acpi_thermal_run;
764 tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
765 add_timer(&(tz->timer));
772 /* --------------------------------------------------------------------------
774 -------------------------------------------------------------------------- */
776 static struct proc_dir_entry *acpi_thermal_dir;
778 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
780 struct acpi_thermal *tz = seq->private;
786 seq_puts(seq, "state: ");
788 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
789 && !tz->state.active)
790 seq_puts(seq, "ok\n");
792 if (tz->state.critical)
793 seq_puts(seq, "critical ");
795 seq_puts(seq, "hot ");
796 if (tz->state.passive)
797 seq_puts(seq, "passive ");
798 if (tz->state.active)
799 seq_printf(seq, "active[%d]", tz->state.active_index);
807 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
809 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
812 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
815 struct acpi_thermal *tz = seq->private;
821 result = acpi_thermal_get_temperature(tz);
825 seq_printf(seq, "temperature: %ld C\n",
826 KELVIN_TO_CELSIUS(tz->temperature));
832 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
834 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
837 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
839 struct acpi_thermal *tz = seq->private;
847 if (tz->trips.critical.flags.valid)
848 seq_printf(seq, "critical (S5): %ld C\n",
849 KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
851 if (tz->trips.hot.flags.valid)
852 seq_printf(seq, "hot (S4): %ld C\n",
853 KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
855 if (tz->trips.passive.flags.valid) {
857 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
858 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
859 tz->trips.passive.tc1, tz->trips.passive.tc2,
860 tz->trips.passive.tsp);
861 for (j = 0; j < tz->trips.passive.devices.count; j++) {
863 seq_printf(seq, "0x%p ",
864 tz->trips.passive.devices.handles[j]);
869 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
870 if (!(tz->trips.active[i].flags.valid))
872 seq_printf(seq, "active[%d]: %ld C: devices=",
874 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
875 for (j = 0; j < tz->trips.active[i].devices.count; j++)
876 seq_printf(seq, "0x%p ",
877 tz->trips.active[i].devices.handles[j]);
885 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
887 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
891 acpi_thermal_write_trip_points(struct file *file,
892 const char __user * buffer,
893 size_t count, loff_t * ppos)
895 struct seq_file *m = file->private_data;
896 struct acpi_thermal *tz = m->private;
899 int num, critical, hot, passive;
904 limit_string = kzalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
908 active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
914 if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
919 if (copy_from_user(limit_string, buffer, count)) {
924 limit_string[count] = '\0';
926 num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
927 &critical, &hot, &passive,
928 &active[0], &active[1], &active[2], &active[3], &active[4],
929 &active[5], &active[6], &active[7], &active[8],
931 if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
936 tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
937 tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
938 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
939 for (i = 0; i < num - 3; i++) {
940 if (!(tz->trips.active[i].flags.valid))
942 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
951 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
953 struct acpi_thermal *tz = seq->private;
959 if (!tz->flags.cooling_mode) {
960 seq_puts(seq, "<setting not supported>\n");
963 if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
964 seq_printf(seq, "cooling mode: critical\n");
966 seq_printf(seq, "cooling mode: %s\n",
967 tz->cooling_mode ? "passive" : "active");
973 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
975 return single_open(file, acpi_thermal_cooling_seq_show,
980 acpi_thermal_write_cooling_mode(struct file *file,
981 const char __user * buffer,
982 size_t count, loff_t * ppos)
984 struct seq_file *m = file->private_data;
985 struct acpi_thermal *tz = m->private;
987 char mode_string[12] = { '\0' };
990 if (!tz || (count > sizeof(mode_string) - 1))
993 if (!tz->flags.cooling_mode)
996 if (copy_from_user(mode_string, buffer, count))
999 mode_string[count] = '\0';
1001 result = acpi_thermal_set_cooling_mode(tz,
1002 simple_strtoul(mode_string, NULL,
1007 acpi_thermal_check(tz);
1012 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1014 struct acpi_thermal *tz = seq->private;
1020 if (!tz->polling_frequency) {
1021 seq_puts(seq, "<polling disabled>\n");
1025 seq_printf(seq, "polling frequency: %lu seconds\n",
1026 (tz->polling_frequency / 10));
1032 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1034 return single_open(file, acpi_thermal_polling_seq_show,
1039 acpi_thermal_write_polling(struct file *file,
1040 const char __user * buffer,
1041 size_t count, loff_t * ppos)
1043 struct seq_file *m = file->private_data;
1044 struct acpi_thermal *tz = m->private;
1046 char polling_string[12] = { '\0' };
1050 if (!tz || (count > sizeof(polling_string) - 1))
1053 if (copy_from_user(polling_string, buffer, count))
1056 polling_string[count] = '\0';
1058 seconds = simple_strtoul(polling_string, NULL, 0);
1060 result = acpi_thermal_set_polling(tz, seconds);
1064 acpi_thermal_check(tz);
1069 static int acpi_thermal_add_fs(struct acpi_device *device)
1071 struct proc_dir_entry *entry = NULL;
1074 if (!acpi_device_dir(device)) {
1075 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1077 if (!acpi_device_dir(device))
1079 acpi_device_dir(device)->owner = THIS_MODULE;
1083 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1084 S_IRUGO, acpi_device_dir(device));
1088 entry->proc_fops = &acpi_thermal_state_fops;
1089 entry->data = acpi_driver_data(device);
1090 entry->owner = THIS_MODULE;
1093 /* 'temperature' [R] */
1094 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1095 S_IRUGO, acpi_device_dir(device));
1099 entry->proc_fops = &acpi_thermal_temp_fops;
1100 entry->data = acpi_driver_data(device);
1101 entry->owner = THIS_MODULE;
1104 /* 'trip_points' [R/W] */
1105 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1106 S_IFREG | S_IRUGO | S_IWUSR,
1107 acpi_device_dir(device));
1111 entry->proc_fops = &acpi_thermal_trip_fops;
1112 entry->data = acpi_driver_data(device);
1113 entry->owner = THIS_MODULE;
1116 /* 'cooling_mode' [R/W] */
1117 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1118 S_IFREG | S_IRUGO | S_IWUSR,
1119 acpi_device_dir(device));
1123 entry->proc_fops = &acpi_thermal_cooling_fops;
1124 entry->data = acpi_driver_data(device);
1125 entry->owner = THIS_MODULE;
1128 /* 'polling_frequency' [R/W] */
1129 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1130 S_IFREG | S_IRUGO | S_IWUSR,
1131 acpi_device_dir(device));
1135 entry->proc_fops = &acpi_thermal_polling_fops;
1136 entry->data = acpi_driver_data(device);
1137 entry->owner = THIS_MODULE;
1143 static int acpi_thermal_remove_fs(struct acpi_device *device)
1146 if (acpi_device_dir(device)) {
1147 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1148 acpi_device_dir(device));
1149 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1150 acpi_device_dir(device));
1151 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1152 acpi_device_dir(device));
1153 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1154 acpi_device_dir(device));
1155 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1156 acpi_device_dir(device));
1157 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1158 acpi_device_dir(device) = NULL;
1164 /* --------------------------------------------------------------------------
1166 -------------------------------------------------------------------------- */
1168 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1170 struct acpi_thermal *tz = data;
1171 struct acpi_device *device = NULL;
1177 device = tz->device;
1180 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1181 acpi_thermal_check(tz);
1183 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1184 acpi_thermal_get_trip_points(tz);
1185 acpi_thermal_check(tz);
1186 acpi_bus_generate_event(device, event, 0);
1188 case ACPI_THERMAL_NOTIFY_DEVICES:
1189 if (tz->flags.devices)
1190 acpi_thermal_get_devices(tz);
1191 acpi_bus_generate_event(device, event, 0);
1194 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1195 "Unsupported event [0x%x]\n", event));
1202 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1210 /* Get temperature [_TMP] (required) */
1211 result = acpi_thermal_get_temperature(tz);
1215 /* Get trip points [_CRT, _PSV, etc.] (required) */
1216 result = acpi_thermal_get_trip_points(tz);
1220 /* Set the cooling mode [_SCP] to active cooling (default) */
1221 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1223 tz->flags.cooling_mode = 1;
1225 /* Oh,we have not _SCP method.
1226 Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1227 tz->flags.cooling_mode = 0;
1228 if (tz->trips.active[0].flags.valid
1229 && tz->trips.passive.flags.valid) {
1230 if (tz->trips.passive.temperature >
1231 tz->trips.active[0].temperature)
1232 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1234 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1235 } else if (!tz->trips.active[0].flags.valid
1236 && tz->trips.passive.flags.valid) {
1237 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1238 } else if (tz->trips.active[0].flags.valid
1239 && !tz->trips.passive.flags.valid) {
1240 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1242 /* _ACx and _PSV are optional, but _CRT is required */
1243 tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1247 /* Get default polling frequency [_TZP] (optional) */
1249 tz->polling_frequency = tzp;
1251 acpi_thermal_get_polling_frequency(tz);
1253 /* Get devices in this thermal zone [_TZD] (optional) */
1254 result = acpi_thermal_get_devices(tz);
1256 tz->flags.devices = 1;
1261 static int acpi_thermal_add(struct acpi_device *device)
1264 acpi_status status = AE_OK;
1265 struct acpi_thermal *tz = NULL;
1271 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1275 tz->device = device;
1276 strcpy(tz->name, device->pnp.bus_id);
1277 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1278 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1279 acpi_driver_data(device) = tz;
1281 result = acpi_thermal_get_info(tz);
1285 result = acpi_thermal_add_fs(device);
1289 init_timer(&tz->timer);
1291 acpi_thermal_check(tz);
1293 status = acpi_install_notify_handler(device->handle,
1295 acpi_thermal_notify, tz);
1296 if (ACPI_FAILURE(status)) {
1301 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1302 acpi_device_name(device), acpi_device_bid(device),
1303 KELVIN_TO_CELSIUS(tz->temperature));
1307 acpi_thermal_remove_fs(device);
1314 static int acpi_thermal_remove(struct acpi_device *device, int type)
1316 acpi_status status = AE_OK;
1317 struct acpi_thermal *tz = NULL;
1320 if (!device || !acpi_driver_data(device))
1323 tz = acpi_driver_data(device);
1325 /* avoid timer adding new defer task */
1327 /* wait for running timer (on other CPUs) finish */
1328 del_timer_sync(&(tz->timer));
1329 /* synchronize deferred task */
1330 acpi_os_wait_events_complete(NULL);
1331 /* deferred task may reinsert timer */
1332 del_timer_sync(&(tz->timer));
1334 status = acpi_remove_notify_handler(device->handle,
1336 acpi_thermal_notify);
1338 /* Terminate policy */
1339 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1340 tz->trips.passive.flags.enabled = 0;
1341 acpi_thermal_passive(tz);
1343 if (tz->trips.active[0].flags.valid
1344 && tz->trips.active[0].flags.enabled) {
1345 tz->trips.active[0].flags.enabled = 0;
1346 acpi_thermal_active(tz);
1349 acpi_thermal_remove_fs(device);
1355 static int acpi_thermal_resume(struct acpi_device *device)
1357 struct acpi_thermal *tz = NULL;
1360 if (!device || !acpi_driver_data(device))
1363 tz = acpi_driver_data(device);
1365 acpi_thermal_get_temperature(tz);
1367 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1368 if (tz->trips.active[i].flags.valid) {
1369 tz->temperature = tz->trips.active[i].temperature;
1370 tz->trips.active[i].flags.enabled = 0;
1372 acpi_thermal_active(tz);
1374 tz->state.active |= tz->trips.active[i].flags.enabled;
1375 tz->state.active_index = i;
1379 acpi_thermal_check(tz);
1384 static int __init acpi_thermal_init(void)
1389 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1390 if (!acpi_thermal_dir)
1392 acpi_thermal_dir->owner = THIS_MODULE;
1394 result = acpi_bus_register_driver(&acpi_thermal_driver);
1396 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1403 static void __exit acpi_thermal_exit(void)
1406 acpi_bus_unregister_driver(&acpi_thermal_driver);
1408 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1413 module_init(acpi_thermal_init);
1414 module_exit(acpi_thermal_exit);