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_PATH_POWEROFF "/sbin/poweroff"
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_call_usermode(char *path)
424 char *argv[2] = { NULL, NULL };
425 char *envp[3] = { NULL, NULL, NULL };
433 /* minimal command environment */
435 envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
437 call_usermodehelper(argv[0], argv, envp, 0);
442 static int acpi_thermal_critical(struct acpi_thermal *tz)
444 if (!tz || !tz->trips.critical.flags.valid)
447 if (tz->temperature >= tz->trips.critical.temperature) {
448 printk(KERN_WARNING PREFIX "Critical trip point\n");
449 tz->trips.critical.flags.enabled = 1;
450 } else if (tz->trips.critical.flags.enabled)
451 tz->trips.critical.flags.enabled = 0;
454 "Critical temperature reached (%ld C), shutting down.\n",
455 KELVIN_TO_CELSIUS(tz->temperature));
456 acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
457 tz->trips.critical.flags.enabled);
459 acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
464 static int acpi_thermal_hot(struct acpi_thermal *tz)
466 if (!tz || !tz->trips.hot.flags.valid)
469 if (tz->temperature >= tz->trips.hot.temperature) {
470 printk(KERN_WARNING PREFIX "Hot trip point\n");
471 tz->trips.hot.flags.enabled = 1;
472 } else if (tz->trips.hot.flags.enabled)
473 tz->trips.hot.flags.enabled = 0;
475 acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
476 tz->trips.hot.flags.enabled);
478 /* TBD: Call user-mode "sleep(S4)" function */
483 static void acpi_thermal_passive(struct acpi_thermal *tz)
486 struct acpi_thermal_passive *passive = NULL;
491 if (!tz || !tz->trips.passive.flags.valid)
494 passive = &(tz->trips.passive);
499 * Calculate the thermal trend (using the passive cooling equation)
500 * and modify the performance limit for all passive cooling devices
501 * accordingly. Note that we assume symmetry.
503 if (tz->temperature >= passive->temperature) {
505 (passive->tc1 * (tz->temperature - tz->last_temperature)) +
506 (passive->tc2 * (tz->temperature - passive->temperature));
507 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
508 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
509 trend, passive->tc1, tz->temperature,
510 tz->last_temperature, passive->tc2,
511 tz->temperature, passive->temperature));
512 passive->flags.enabled = 1;
515 for (i = 0; i < passive->devices.count; i++)
516 acpi_processor_set_thermal_limit(passive->
519 ACPI_PROCESSOR_LIMIT_INCREMENT);
521 else if (trend < 0) {
522 for (i = 0; i < passive->devices.count; i++)
524 * assume that we are on highest
525 * freq/lowest thrott and can leave
526 * passive mode, even in error case
528 if (!acpi_processor_set_thermal_limit
529 (passive->devices.handles[i],
530 ACPI_PROCESSOR_LIMIT_DECREMENT))
533 * Leave cooling mode, even if the temp might
534 * higher than trip point This is because some
535 * machines might have long thermal polling
536 * frequencies (tsp) defined. We will fall back
537 * into passive mode in next cycle (probably quicker)
540 passive->flags.enabled = 0;
541 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
542 "Disabling passive cooling, still above threshold,"
543 " but we are cooling down\n"));
552 * Implement passive cooling hysteresis to slowly increase performance
553 * and avoid thrashing around the passive trip point. Note that we
556 if (!passive->flags.enabled)
558 for (i = 0; i < passive->devices.count; i++)
559 if (!acpi_processor_set_thermal_limit
560 (passive->devices.handles[i],
561 ACPI_PROCESSOR_LIMIT_DECREMENT))
564 passive->flags.enabled = 0;
565 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
566 "Disabling passive cooling (zone is cool)\n"));
570 static void acpi_thermal_active(struct acpi_thermal *tz)
573 struct acpi_thermal_active *active = NULL;
576 unsigned long maxtemp = 0;
582 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
583 active = &(tz->trips.active[i]);
584 if (!active || !active->flags.valid)
586 if (tz->temperature >= active->temperature) {
590 * If not already enabled, turn ON all cooling devices
591 * associated with this active threshold.
593 if (active->temperature > maxtemp)
594 tz->state.active_index = i;
595 maxtemp = active->temperature;
596 if (active->flags.enabled)
598 for (j = 0; j < active->devices.count; j++) {
600 acpi_bus_set_power(active->devices.
604 printk(KERN_WARNING PREFIX
605 "Unable to turn cooling device [%p] 'on'\n",
610 active->flags.enabled = 1;
611 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
612 "Cooling device [%p] now 'on'\n",
613 active->devices.handles[j]));
617 if (!active->flags.enabled)
622 * Turn OFF all cooling devices associated with this
625 for (j = 0; j < active->devices.count; j++) {
626 result = acpi_bus_set_power(active->devices.handles[j],
629 printk(KERN_WARNING PREFIX
630 "Unable to turn cooling device [%p] 'off'\n",
631 active->devices.handles[j]);
634 active->flags.enabled = 0;
635 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
636 "Cooling device [%p] now 'off'\n",
637 active->devices.handles[j]));
642 static void acpi_thermal_check(void *context);
644 static void acpi_thermal_run(unsigned long data)
646 struct acpi_thermal *tz = (struct acpi_thermal *)data;
648 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
651 static void acpi_thermal_check(void *data)
654 struct acpi_thermal *tz = data;
655 unsigned long sleep_time = 0;
657 struct acpi_thermal_state state;
661 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
667 result = acpi_thermal_get_temperature(tz);
671 memset(&tz->state, 0, sizeof(tz->state));
676 * Compare the current temperature to the trip point values to see
677 * if we've entered one of the thermal policy states. Note that
678 * this function determines when a state is entered, but the
679 * individual policy decides when it is exited (e.g. hysteresis).
681 if (tz->trips.critical.flags.valid)
683 (tz->temperature >= tz->trips.critical.temperature);
684 if (tz->trips.hot.flags.valid)
685 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
686 if (tz->trips.passive.flags.valid)
688 (tz->temperature >= tz->trips.passive.temperature);
689 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
690 if (tz->trips.active[i].flags.valid)
693 tz->trips.active[i].temperature);
698 * Separated from the above check to allow individual policy to
699 * determine when to exit a given state.
702 acpi_thermal_critical(tz);
704 acpi_thermal_hot(tz);
706 acpi_thermal_passive(tz);
708 acpi_thermal_active(tz);
713 * Again, separated from the above two to allow independent policy
716 tz->state.critical = tz->trips.critical.flags.enabled;
717 tz->state.hot = tz->trips.hot.flags.enabled;
718 tz->state.passive = tz->trips.passive.flags.enabled;
719 tz->state.active = 0;
720 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
721 tz->state.active |= tz->trips.active[i].flags.enabled;
724 * Calculate Sleep Time
725 * --------------------
726 * If we're in the passive state, use _TSP's value. Otherwise
727 * use the default polling frequency (e.g. _TZP). If no polling
728 * frequency is specified then we'll wait forever (at least until
729 * a thermal event occurs). Note that _TSP and _TZD values are
730 * given in 1/10th seconds (we must covert to milliseconds).
732 if (tz->state.passive)
733 sleep_time = tz->trips.passive.tsp * 100;
734 else if (tz->polling_frequency > 0)
735 sleep_time = tz->polling_frequency * 100;
737 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
738 tz->name, tz->temperature, sleep_time));
745 if (timer_pending(&(tz->timer)))
746 del_timer(&(tz->timer));
748 if (timer_pending(&(tz->timer)))
749 mod_timer(&(tz->timer),
750 jiffies + (HZ * sleep_time) / 1000);
752 tz->timer.data = (unsigned long)tz;
753 tz->timer.function = acpi_thermal_run;
754 tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
755 add_timer(&(tz->timer));
762 /* --------------------------------------------------------------------------
764 -------------------------------------------------------------------------- */
766 static struct proc_dir_entry *acpi_thermal_dir;
768 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
770 struct acpi_thermal *tz = seq->private;
776 seq_puts(seq, "state: ");
778 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
779 && !tz->state.active)
780 seq_puts(seq, "ok\n");
782 if (tz->state.critical)
783 seq_puts(seq, "critical ");
785 seq_puts(seq, "hot ");
786 if (tz->state.passive)
787 seq_puts(seq, "passive ");
788 if (tz->state.active)
789 seq_printf(seq, "active[%d]", tz->state.active_index);
797 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
799 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
802 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
805 struct acpi_thermal *tz = seq->private;
811 result = acpi_thermal_get_temperature(tz);
815 seq_printf(seq, "temperature: %ld C\n",
816 KELVIN_TO_CELSIUS(tz->temperature));
822 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
824 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
827 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
829 struct acpi_thermal *tz = seq->private;
830 struct acpi_device *device;
840 if (tz->trips.critical.flags.valid)
841 seq_printf(seq, "critical (S5): %ld C\n",
842 KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
844 if (tz->trips.hot.flags.valid)
845 seq_printf(seq, "hot (S4): %ld C\n",
846 KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
848 if (tz->trips.passive.flags.valid) {
850 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
851 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
852 tz->trips.passive.tc1, tz->trips.passive.tc2,
853 tz->trips.passive.tsp);
854 for (j = 0; j < tz->trips.passive.devices.count; j++) {
855 status = acpi_bus_get_device(tz->trips.passive.devices.
856 handles[j], &device);
857 seq_printf(seq, "%4.4s ", status ? "" :
858 acpi_device_bid(device));
863 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
864 if (!(tz->trips.active[i].flags.valid))
866 seq_printf(seq, "active[%d]: %ld C: devices=",
868 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
869 for (j = 0; j < tz->trips.active[i].devices.count; j++){
870 status = acpi_bus_get_device(tz->trips.active[i].
873 seq_printf(seq, "%4.4s ", status ? "" :
874 acpi_device_bid(device));
883 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
885 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
888 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
890 struct acpi_thermal *tz = seq->private;
896 if (!tz->flags.cooling_mode)
897 seq_puts(seq, "<setting not supported>\n");
899 seq_puts(seq, "0 - Active; 1 - Passive\n");
905 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
907 return single_open(file, acpi_thermal_cooling_seq_show,
912 acpi_thermal_write_cooling_mode(struct file *file,
913 const char __user * buffer,
914 size_t count, loff_t * ppos)
916 struct seq_file *m = file->private_data;
917 struct acpi_thermal *tz = m->private;
919 char mode_string[12] = { '\0' };
922 if (!tz || (count > sizeof(mode_string) - 1))
925 if (!tz->flags.cooling_mode)
928 if (copy_from_user(mode_string, buffer, count))
931 mode_string[count] = '\0';
933 result = acpi_thermal_set_cooling_mode(tz,
934 simple_strtoul(mode_string, NULL,
939 acpi_thermal_check(tz);
944 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
946 struct acpi_thermal *tz = seq->private;
952 if (!tz->polling_frequency) {
953 seq_puts(seq, "<polling disabled>\n");
957 seq_printf(seq, "polling frequency: %lu seconds\n",
958 (tz->polling_frequency / 10));
964 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
966 return single_open(file, acpi_thermal_polling_seq_show,
971 acpi_thermal_write_polling(struct file *file,
972 const char __user * buffer,
973 size_t count, loff_t * ppos)
975 struct seq_file *m = file->private_data;
976 struct acpi_thermal *tz = m->private;
978 char polling_string[12] = { '\0' };
982 if (!tz || (count > sizeof(polling_string) - 1))
985 if (copy_from_user(polling_string, buffer, count))
988 polling_string[count] = '\0';
990 seconds = simple_strtoul(polling_string, NULL, 0);
992 result = acpi_thermal_set_polling(tz, seconds);
996 acpi_thermal_check(tz);
1001 static int acpi_thermal_add_fs(struct acpi_device *device)
1003 struct proc_dir_entry *entry = NULL;
1006 if (!acpi_device_dir(device)) {
1007 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1009 if (!acpi_device_dir(device))
1011 acpi_device_dir(device)->owner = THIS_MODULE;
1015 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1016 S_IRUGO, acpi_device_dir(device));
1020 entry->proc_fops = &acpi_thermal_state_fops;
1021 entry->data = acpi_driver_data(device);
1022 entry->owner = THIS_MODULE;
1025 /* 'temperature' [R] */
1026 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1027 S_IRUGO, acpi_device_dir(device));
1031 entry->proc_fops = &acpi_thermal_temp_fops;
1032 entry->data = acpi_driver_data(device);
1033 entry->owner = THIS_MODULE;
1036 /* 'trip_points' [R/W] */
1037 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1038 S_IFREG | S_IRUGO | S_IWUSR,
1039 acpi_device_dir(device));
1043 entry->proc_fops = &acpi_thermal_trip_fops;
1044 entry->data = acpi_driver_data(device);
1045 entry->owner = THIS_MODULE;
1048 /* 'cooling_mode' [R/W] */
1049 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1050 S_IFREG | S_IRUGO | S_IWUSR,
1051 acpi_device_dir(device));
1055 entry->proc_fops = &acpi_thermal_cooling_fops;
1056 entry->data = acpi_driver_data(device);
1057 entry->owner = THIS_MODULE;
1060 /* 'polling_frequency' [R/W] */
1061 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1062 S_IFREG | S_IRUGO | S_IWUSR,
1063 acpi_device_dir(device));
1067 entry->proc_fops = &acpi_thermal_polling_fops;
1068 entry->data = acpi_driver_data(device);
1069 entry->owner = THIS_MODULE;
1075 static int acpi_thermal_remove_fs(struct acpi_device *device)
1078 if (acpi_device_dir(device)) {
1079 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1080 acpi_device_dir(device));
1081 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1082 acpi_device_dir(device));
1083 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1084 acpi_device_dir(device));
1085 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1086 acpi_device_dir(device));
1087 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1088 acpi_device_dir(device));
1089 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1090 acpi_device_dir(device) = NULL;
1096 /* --------------------------------------------------------------------------
1098 -------------------------------------------------------------------------- */
1100 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1102 struct acpi_thermal *tz = data;
1103 struct acpi_device *device = NULL;
1109 device = tz->device;
1112 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1113 acpi_thermal_check(tz);
1115 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1116 acpi_thermal_get_trip_points(tz);
1117 acpi_thermal_check(tz);
1118 acpi_bus_generate_event(device, event, 0);
1120 case ACPI_THERMAL_NOTIFY_DEVICES:
1121 if (tz->flags.devices)
1122 acpi_thermal_get_devices(tz);
1123 acpi_bus_generate_event(device, event, 0);
1126 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1127 "Unsupported event [0x%x]\n", event));
1134 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1142 /* Get temperature [_TMP] (required) */
1143 result = acpi_thermal_get_temperature(tz);
1147 /* Get trip points [_CRT, _PSV, etc.] (required) */
1148 result = acpi_thermal_get_trip_points(tz);
1152 /* Set the cooling mode [_SCP] to active cooling (default) */
1153 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1155 tz->flags.cooling_mode = 1;
1157 /* Get default polling frequency [_TZP] (optional) */
1159 tz->polling_frequency = tzp;
1161 acpi_thermal_get_polling_frequency(tz);
1163 /* Get devices in this thermal zone [_TZD] (optional) */
1164 result = acpi_thermal_get_devices(tz);
1166 tz->flags.devices = 1;
1171 static int acpi_thermal_add(struct acpi_device *device)
1174 acpi_status status = AE_OK;
1175 struct acpi_thermal *tz = NULL;
1181 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1185 tz->device = device;
1186 strcpy(tz->name, device->pnp.bus_id);
1187 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1188 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1189 acpi_driver_data(device) = tz;
1191 result = acpi_thermal_get_info(tz);
1195 result = acpi_thermal_add_fs(device);
1199 init_timer(&tz->timer);
1201 acpi_thermal_check(tz);
1203 status = acpi_install_notify_handler(device->handle,
1205 acpi_thermal_notify, tz);
1206 if (ACPI_FAILURE(status)) {
1211 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1212 acpi_device_name(device), acpi_device_bid(device),
1213 KELVIN_TO_CELSIUS(tz->temperature));
1217 acpi_thermal_remove_fs(device);
1224 static int acpi_thermal_remove(struct acpi_device *device, int type)
1226 acpi_status status = AE_OK;
1227 struct acpi_thermal *tz = NULL;
1230 if (!device || !acpi_driver_data(device))
1233 tz = acpi_driver_data(device);
1235 /* avoid timer adding new defer task */
1237 /* wait for running timer (on other CPUs) finish */
1238 del_timer_sync(&(tz->timer));
1239 /* synchronize deferred task */
1240 acpi_os_wait_events_complete(NULL);
1241 /* deferred task may reinsert timer */
1242 del_timer_sync(&(tz->timer));
1244 status = acpi_remove_notify_handler(device->handle,
1246 acpi_thermal_notify);
1248 /* Terminate policy */
1249 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1250 tz->trips.passive.flags.enabled = 0;
1251 acpi_thermal_passive(tz);
1253 if (tz->trips.active[0].flags.valid
1254 && tz->trips.active[0].flags.enabled) {
1255 tz->trips.active[0].flags.enabled = 0;
1256 acpi_thermal_active(tz);
1259 acpi_thermal_remove_fs(device);
1265 static int acpi_thermal_resume(struct acpi_device *device)
1267 struct acpi_thermal *tz = NULL;
1268 int i, j, power_state, result;
1271 if (!device || !acpi_driver_data(device))
1274 tz = acpi_driver_data(device);
1276 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1277 if (!(&tz->trips.active[i]))
1279 if (!tz->trips.active[i].flags.valid)
1281 tz->trips.active[i].flags.enabled = 1;
1282 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1283 result = acpi_bus_get_power(tz->trips.active[i].devices.
1284 handles[j], &power_state);
1285 if (result || (power_state != ACPI_STATE_D0)) {
1286 tz->trips.active[i].flags.enabled = 0;
1290 tz->state.active |= tz->trips.active[i].flags.enabled;
1293 acpi_thermal_check(tz);
1298 static int __init acpi_thermal_init(void)
1303 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1304 if (!acpi_thermal_dir)
1306 acpi_thermal_dir->owner = THIS_MODULE;
1308 result = acpi_bus_register_driver(&acpi_thermal_driver);
1310 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1317 static void __exit acpi_thermal_exit(void)
1320 acpi_bus_unregister_driver(&acpi_thermal_driver);
1322 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1327 module_init(acpi_thermal_init);
1328 module_exit(acpi_thermal_exit);