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Start split out of common open firmware code
[usb.git] / drivers / acpi / thermal.c
blob58f1338981bca1d93ec525eb6a26a8532a392bbc
1 /*
2 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
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.
13 *
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.
18 *
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.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 *
25 * This driver fully implements the ACPI thermal policy as described in the
26 * ACPI 2.0 Specification.
27 *
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.
31 *
32 */
33
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/types.h>
38 #include <linux/proc_fs.h>
39 #include <linux/timer.h>
40 #include <linux/jiffies.h>
41 #include <linux/kmod.h>
42 #include <linux/seq_file.h>
43 #include <linux/reboot.h>
44 #include <asm/uaccess.h>
45
46 #include <acpi/acpi_bus.h>
47 #include <acpi/acpi_drivers.h>
48
49 #define ACPI_THERMAL_COMPONENT 0x04000000
50 #define ACPI_THERMAL_CLASS "thermal_zone"
51 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
52 #define ACPI_THERMAL_FILE_STATE "state"
53 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
54 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
55 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
56 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
57 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
58 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
59 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82
60 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
61 #define ACPI_THERMAL_NOTIFY_HOT 0xF1
62 #define ACPI_THERMAL_MODE_ACTIVE 0x00
63
64 #define ACPI_THERMAL_MAX_ACTIVE 10
65 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
66
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)
69
70 #define _COMPONENT ACPI_THERMAL_COMPONENT
71 ACPI_MODULE_NAME("thermal");
72
73 MODULE_AUTHOR("Paul Diefenbaugh");
74 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
75 MODULE_LICENSE("GPL");
76
77 static int tzp;
78 module_param(tzp, int, 0);
79 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
80
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,
90 loff_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 *,
93 size_t, loff_t *);
94
95 static struct acpi_driver acpi_thermal_driver = {
96 .name = "thermal",
97 .class = ACPI_THERMAL_CLASS,
98 .ids = ACPI_THERMAL_HID,
99 .ops = {
100 .add = acpi_thermal_add,
101 .remove = acpi_thermal_remove,
102 .resume = acpi_thermal_resume,
103 },
104 };
105
106 struct acpi_thermal_state {
107 u8 critical:1;
108 u8 hot:1;
109 u8 passive:1;
110 u8 active:1;
111 u8 reserved:4;
112 int active_index;
113 };
114
115 struct acpi_thermal_state_flags {
116 u8 valid:1;
117 u8 enabled:1;
118 u8 reserved:6;
119 };
120
121 struct acpi_thermal_critical {
122 struct acpi_thermal_state_flags flags;
123 unsigned long temperature;
124 };
125
126 struct acpi_thermal_hot {
127 struct acpi_thermal_state_flags flags;
128 unsigned long temperature;
129 };
130
131 struct acpi_thermal_passive {
132 struct acpi_thermal_state_flags flags;
133 unsigned long temperature;
134 unsigned long tc1;
135 unsigned long tc2;
136 unsigned long tsp;
137 struct acpi_handle_list devices;
138 };
139
140 struct acpi_thermal_active {
141 struct acpi_thermal_state_flags flags;
142 unsigned long temperature;
143 struct acpi_handle_list devices;
144 };
145
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];
151 };
152
153 struct acpi_thermal_flags {
154 u8 cooling_mode:1; /* _SCP */
155 u8 devices:1; /* _TZD */
156 u8 reserved:6;
157 };
158
159 struct acpi_thermal {
160 struct acpi_device * device;
161 acpi_bus_id name;
162 unsigned long temperature;
163 unsigned long last_temperature;
164 unsigned long polling_frequency;
165 volatile u8 zombie;
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;
171 };
172
173 static const struct file_operations acpi_thermal_state_fops = {
174 .open = acpi_thermal_state_open_fs,
175 .read = seq_read,
176 .llseek = seq_lseek,
177 .release = single_release,
178 };
179
180 static const struct file_operations acpi_thermal_temp_fops = {
181 .open = acpi_thermal_temp_open_fs,
182 .read = seq_read,
183 .llseek = seq_lseek,
184 .release = single_release,
185 };
186
187 static const struct file_operations acpi_thermal_trip_fops = {
188 .open = acpi_thermal_trip_open_fs,
189 .read = seq_read,
190 .llseek = seq_lseek,
191 .release = single_release,
192 };
193
194 static const struct file_operations acpi_thermal_cooling_fops = {
195 .open = acpi_thermal_cooling_open_fs,
196 .read = seq_read,
197 .write = acpi_thermal_write_cooling_mode,
198 .llseek = seq_lseek,
199 .release = single_release,
200 };
201
202 static const struct file_operations acpi_thermal_polling_fops = {
203 .open = acpi_thermal_polling_open_fs,
204 .read = seq_read,
205 .write = acpi_thermal_write_polling,
206 .llseek = seq_lseek,
207 .release = single_release,
208 };
209
210 /* --------------------------------------------------------------------------
211 Thermal Zone Management
212 -------------------------------------------------------------------------- */
213
214 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
215 {
216 acpi_status status = AE_OK;
217
218
219 if (!tz)
220 return -EINVAL;
221
222 tz->last_temperature = tz->temperature;
223
224 status =
225 acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
226 if (ACPI_FAILURE(status))
227 return -ENODEV;
228
229 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
230 tz->temperature));
231
232 return 0;
233 }
234
235 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
236 {
237 acpi_status status = AE_OK;
238
239
240 if (!tz)
241 return -EINVAL;
242
243 status =
244 acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
245 &tz->polling_frequency);
246 if (ACPI_FAILURE(status))
247 return -ENODEV;
248
249 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
250 tz->polling_frequency));
251
252 return 0;
253 }
254
255 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
256 {
257
258 if (!tz)
259 return -EINVAL;
260
261 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */
262
263 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
264 "Polling frequency set to %lu seconds\n",
265 tz->polling_frequency/10));
266
267 return 0;
268 }
269
270 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
271 {
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;
276
277
278 if (!tz)
279 return -EINVAL;
280
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"));
284 return -ENODEV;
285 }
286
287 arg0.integer.value = mode;
288
289 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
290 if (ACPI_FAILURE(status))
291 return -ENODEV;
292
293 return 0;
294 }
295
296 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
297 {
298 acpi_status status = AE_OK;
299 int i = 0;
300
301
302 if (!tz)
303 return -EINVAL;
304
305 /* Critical Shutdown (required) */
306
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"));
312 return -ENODEV;
313 } else {
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));
318 }
319
320 /* Critical Sleep (optional) */
321
322 status =
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"));
328 } else {
329 tz->trips.hot.flags.valid = 1;
330 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
331 tz->trips.hot.temperature));
332 }
333
334 /* Passive: Processors (optional) */
335
336 status =
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"));
342 } else {
343 tz->trips.passive.flags.valid = 1;
344
345 status =
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;
350
351 status =
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;
356
357 status =
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;
362
363 status =
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;
368
369 if (!tz->trips.passive.flags.valid)
370 printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
371 else
372 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
373 "Found passive threshold [%lu]\n",
374 tz->trips.passive.temperature));
375 }
376
377 /* Active: Fans, etc. (optional) */
378
379 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
380
381 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
382
383 status =
384 acpi_evaluate_integer(tz->device->handle, name, NULL,
385 &tz->trips.active[i].temperature);
386 if (ACPI_FAILURE(status))
387 break;
388
389 name[2] = 'L';
390 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));
398 } else
399 ACPI_EXCEPTION((AE_INFO, status,
400 "Invalid active threshold [%d]", i));
401 }
402
403 return 0;
404 }
405
406 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
407 {
408 acpi_status status = AE_OK;
409
410
411 if (!tz)
412 return -EINVAL;
413
414 status =
415 acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
416 if (ACPI_FAILURE(status))
417 return -ENODEV;
418
419 return 0;
420 }
421
422 static int acpi_thermal_critical(struct acpi_thermal *tz)
423 {
424 if (!tz || !tz->trips.critical.flags.valid)
425 return -EINVAL;
426
427 if (tz->temperature >= tz->trips.critical.temperature) {
428 printk(KERN_WARNING PREFIX "Critical trip point\n");
429 tz->trips.critical.flags.enabled = 1;
430 } else if (tz->trips.critical.flags.enabled)
431 tz->trips.critical.flags.enabled = 0;
432
433 printk(KERN_EMERG
434 "Critical temperature reached (%ld C), shutting down.\n",
435 KELVIN_TO_CELSIUS(tz->temperature));
436 acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
437 tz->trips.critical.flags.enabled);
438
439 orderly_poweroff(true);
440
441 return 0;
442 }
443
444 static int acpi_thermal_hot(struct acpi_thermal *tz)
445 {
446 if (!tz || !tz->trips.hot.flags.valid)
447 return -EINVAL;
448
449 if (tz->temperature >= tz->trips.hot.temperature) {
450 printk(KERN_WARNING PREFIX "Hot trip point\n");
451 tz->trips.hot.flags.enabled = 1;
452 } else if (tz->trips.hot.flags.enabled)
453 tz->trips.hot.flags.enabled = 0;
454
455 acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
456 tz->trips.hot.flags.enabled);
457
458 /* TBD: Call user-mode "sleep(S4)" function */
459
460 return 0;
461 }
462
463 static void acpi_thermal_passive(struct acpi_thermal *tz)
464 {
465 int result = 1;
466 struct acpi_thermal_passive *passive = NULL;
467 int trend = 0;
468 int i = 0;
469
470
471 if (!tz || !tz->trips.passive.flags.valid)
472 return;
473
474 passive = &(tz->trips.passive);
475
476 /*
477 * Above Trip?
478 * -----------
479 * Calculate the thermal trend (using the passive cooling equation)
480 * and modify the performance limit for all passive cooling devices
481 * accordingly. Note that we assume symmetry.
482 */
483 if (tz->temperature >= passive->temperature) {
484 trend =
485 (passive->tc1 * (tz->temperature - tz->last_temperature)) +
486 (passive->tc2 * (tz->temperature - passive->temperature));
487 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
488 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
489 trend, passive->tc1, tz->temperature,
490 tz->last_temperature, passive->tc2,
491 tz->temperature, passive->temperature));
492 passive->flags.enabled = 1;
493 /* Heating up? */
494 if (trend > 0)
495 for (i = 0; i < passive->devices.count; i++)
496 acpi_processor_set_thermal_limit(passive->
497 devices.
498 handles[i],
499 ACPI_PROCESSOR_LIMIT_INCREMENT);
500 /* Cooling off? */
501 else if (trend < 0) {
502 for (i = 0; i < passive->devices.count; i++)
503 /*
504 * assume that we are on highest
505 * freq/lowest thrott and can leave
506 * passive mode, even in error case
507 */
508 if (!acpi_processor_set_thermal_limit
509 (passive->devices.handles[i],
510 ACPI_PROCESSOR_LIMIT_DECREMENT))
511 result = 0;
512 /*
513 * Leave cooling mode, even if the temp might
514 * higher than trip point This is because some
515 * machines might have long thermal polling
516 * frequencies (tsp) defined. We will fall back
517 * into passive mode in next cycle (probably quicker)
518 */
519 if (result) {
520 passive->flags.enabled = 0;
521 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
522 "Disabling passive cooling, still above threshold,"
523 " but we are cooling down\n"));
524 }
525 }
526 return;
527 }
528
529 /*
530 * Below Trip?
531 * -----------
532 * Implement passive cooling hysteresis to slowly increase performance
533 * and avoid thrashing around the passive trip point. Note that we
534 * assume symmetry.
535 */
536 if (!passive->flags.enabled)
537 return;
538 for (i = 0; i < passive->devices.count; i++)
539 if (!acpi_processor_set_thermal_limit
540 (passive->devices.handles[i],
541 ACPI_PROCESSOR_LIMIT_DECREMENT))
542 result = 0;
543 if (result) {
544 passive->flags.enabled = 0;
545 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
546 "Disabling passive cooling (zone is cool)\n"));
547 }
548 }
549
550 static void acpi_thermal_active(struct acpi_thermal *tz)
551 {
552 int result = 0;
553 struct acpi_thermal_active *active = NULL;
554 int i = 0;
555 int j = 0;
556 unsigned long maxtemp = 0;
557
558
559 if (!tz)
560 return;
561
562 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
563 active = &(tz->trips.active[i]);
564 if (!active || !active->flags.valid)
565 break;
566 if (tz->temperature >= active->temperature) {
567 /*
568 * Above Threshold?
569 * ----------------
570 * If not already enabled, turn ON all cooling devices
571 * associated with this active threshold.
572 */
573 if (active->temperature > maxtemp)
574 tz->state.active_index = i;
575 maxtemp = active->temperature;
576 if (active->flags.enabled)
577 continue;
578 for (j = 0; j < active->devices.count; j++) {
579 result =
580 acpi_bus_set_power(active->devices.
581 handles[j],
582 ACPI_STATE_D0);
583 if (result) {
584 printk(KERN_WARNING PREFIX
585 "Unable to turn cooling device [%p] 'on'\n",
586 active->devices.
587 handles[j]);
588 continue;
589 }
590 active->flags.enabled = 1;
591 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
592 "Cooling device [%p] now 'on'\n",
593 active->devices.handles[j]));
594 }
595 continue;
596 }
597 if (!active->flags.enabled)
598 continue;
599 /*
600 * Below Threshold?
601 * ----------------
602 * Turn OFF all cooling devices associated with this
603 * threshold.
604 */
605 for (j = 0; j < active->devices.count; j++) {
606 result = acpi_bus_set_power(active->devices.handles[j],
607 ACPI_STATE_D3);
608 if (result) {
609 printk(KERN_WARNING PREFIX
610 "Unable to turn cooling device [%p] 'off'\n",
611 active->devices.handles[j]);
612 continue;
613 }
614 active->flags.enabled = 0;
615 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
616 "Cooling device [%p] now 'off'\n",
617 active->devices.handles[j]));
618 }
619 }
620 }
621
622 static void acpi_thermal_check(void *context);
623
624 static void acpi_thermal_run(unsigned long data)
625 {
626 struct acpi_thermal *tz = (struct acpi_thermal *)data;
627 if (!tz->zombie)
628 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
629 }
630
631 static void acpi_thermal_check(void *data)
632 {
633 int result = 0;
634 struct acpi_thermal *tz = data;
635 unsigned long sleep_time = 0;
636 int i = 0;
637 struct acpi_thermal_state state;
638
639
640 if (!tz) {
641 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
642 return;
643 }
644
645 state = tz->state;
646
647 result = acpi_thermal_get_temperature(tz);
648 if (result)
649 return;
650
651 memset(&tz->state, 0, sizeof(tz->state));
652
653 /*
654 * Check Trip Points
655 * -----------------
656 * Compare the current temperature to the trip point values to see
657 * if we've entered one of the thermal policy states. Note that
658 * this function determines when a state is entered, but the
659 * individual policy decides when it is exited (e.g. hysteresis).
660 */
661 if (tz->trips.critical.flags.valid)
662 state.critical |=
663 (tz->temperature >= tz->trips.critical.temperature);
664 if (tz->trips.hot.flags.valid)
665 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
666 if (tz->trips.passive.flags.valid)
667 state.passive |=
668 (tz->temperature >= tz->trips.passive.temperature);
669 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
670 if (tz->trips.active[i].flags.valid)
671 state.active |=
672 (tz->temperature >=
673 tz->trips.active[i].temperature);
674
675 /*
676 * Invoke Policy
677 * -------------
678 * Separated from the above check to allow individual policy to
679 * determine when to exit a given state.
680 */
681 if (state.critical)
682 acpi_thermal_critical(tz);
683 if (state.hot)
684 acpi_thermal_hot(tz);
685 if (state.passive)
686 acpi_thermal_passive(tz);
687 if (state.active)
688 acpi_thermal_active(tz);
689
690 /*
691 * Calculate State
692 * ---------------
693 * Again, separated from the above two to allow independent policy
694 * decisions.
695 */
696 tz->state.critical = tz->trips.critical.flags.enabled;
697 tz->state.hot = tz->trips.hot.flags.enabled;
698 tz->state.passive = tz->trips.passive.flags.enabled;
699 tz->state.active = 0;
700 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
701 tz->state.active |= tz->trips.active[i].flags.enabled;
702
703 /*
704 * Calculate Sleep Time
705 * --------------------
706 * If we're in the passive state, use _TSP's value. Otherwise
707 * use the default polling frequency (e.g. _TZP). If no polling
708 * frequency is specified then we'll wait forever (at least until
709 * a thermal event occurs). Note that _TSP and _TZD values are
710 * given in 1/10th seconds (we must covert to milliseconds).
711 */
712 if (tz->state.passive)
713 sleep_time = tz->trips.passive.tsp * 100;
714 else if (tz->polling_frequency > 0)
715 sleep_time = tz->polling_frequency * 100;
716
717 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
718 tz->name, tz->temperature, sleep_time));
719
720 /*
721 * Schedule Next Poll
722 * ------------------
723 */
724 if (!sleep_time) {
725 if (timer_pending(&(tz->timer)))
726 del_timer(&(tz->timer));
727 } else {
728 if (timer_pending(&(tz->timer)))
729 mod_timer(&(tz->timer),
730 jiffies + (HZ * sleep_time) / 1000);
731 else {
732 tz->timer.data = (unsigned long)tz;
733 tz->timer.function = acpi_thermal_run;
734 tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
735 add_timer(&(tz->timer));
736 }
737 }
738
739 return;
740 }
741
742 /* --------------------------------------------------------------------------
743 FS Interface (/proc)
744 -------------------------------------------------------------------------- */
745
746 static struct proc_dir_entry *acpi_thermal_dir;
747
748 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
749 {
750 struct acpi_thermal *tz = seq->private;
751
752
753 if (!tz)
754 goto end;
755
756 seq_puts(seq, "state: ");
757
758 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
759 && !tz->state.active)
760 seq_puts(seq, "ok\n");
761 else {
762 if (tz->state.critical)
763 seq_puts(seq, "critical ");
764 if (tz->state.hot)
765 seq_puts(seq, "hot ");
766 if (tz->state.passive)
767 seq_puts(seq, "passive ");
768 if (tz->state.active)
769 seq_printf(seq, "active[%d]", tz->state.active_index);
770 seq_puts(seq, "\n");
771 }
772
773 end:
774 return 0;
775 }
776
777 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
778 {
779 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
780 }
781
782 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
783 {
784 int result = 0;
785 struct acpi_thermal *tz = seq->private;
786
787
788 if (!tz)
789 goto end;
790
791 result = acpi_thermal_get_temperature(tz);
792 if (result)
793 goto end;
794
795 seq_printf(seq, "temperature: %ld C\n",
796 KELVIN_TO_CELSIUS(tz->temperature));
797
798 end:
799 return 0;
800 }
801
802 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
803 {
804 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
805 }
806
807 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
808 {
809 struct acpi_thermal *tz = seq->private;
810 struct acpi_device *device;
811 acpi_status status;
812
813 int i = 0;
814 int j = 0;
815
816
817 if (!tz)
818 goto end;
819
820 if (tz->trips.critical.flags.valid)
821 seq_printf(seq, "critical (S5): %ld C\n",
822 KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
823
824 if (tz->trips.hot.flags.valid)
825 seq_printf(seq, "hot (S4): %ld C\n",
826 KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
827
828 if (tz->trips.passive.flags.valid) {
829 seq_printf(seq,
830 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
831 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
832 tz->trips.passive.tc1, tz->trips.passive.tc2,
833 tz->trips.passive.tsp);
834 for (j = 0; j < tz->trips.passive.devices.count; j++) {
835 status = acpi_bus_get_device(tz->trips.passive.devices.
836 handles[j], &device);
837 seq_printf(seq, "%4.4s ", status ? "" :
838 acpi_device_bid(device));
839 }
840 seq_puts(seq, "\n");
841 }
842
843 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
844 if (!(tz->trips.active[i].flags.valid))
845 break;
846 seq_printf(seq, "active[%d]: %ld C: devices=",
847 i,
848 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
849 for (j = 0; j < tz->trips.active[i].devices.count; j++){
850 status = acpi_bus_get_device(tz->trips.active[i].
851 devices.handles[j],
852 &device);
853 seq_printf(seq, "%4.4s ", status ? "" :
854 acpi_device_bid(device));
855 }
856 seq_puts(seq, "\n");
857 }
858
859 end:
860 return 0;
861 }
862
863 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
864 {
865 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
866 }
867
868 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
869 {
870 struct acpi_thermal *tz = seq->private;
871
872
873 if (!tz)
874 goto end;
875
876 if (!tz->flags.cooling_mode)
877 seq_puts(seq, "<setting not supported>\n");
878 else
879 seq_puts(seq, "0 - Active; 1 - Passive\n");
880
881 end:
882 return 0;
883 }
884
885 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
886 {
887 return single_open(file, acpi_thermal_cooling_seq_show,
888 PDE(inode)->data);
889 }
890
891 static ssize_t
892 acpi_thermal_write_cooling_mode(struct file *file,
893 const char __user * buffer,
894 size_t count, loff_t * ppos)
895 {
896 struct seq_file *m = file->private_data;
897 struct acpi_thermal *tz = m->private;
898 int result = 0;
899 char mode_string[12] = { '\0' };
900
901
902 if (!tz || (count > sizeof(mode_string) - 1))
903 return -EINVAL;
904
905 if (!tz->flags.cooling_mode)
906 return -ENODEV;
907
908 if (copy_from_user(mode_string, buffer, count))
909 return -EFAULT;
910
911 mode_string[count] = '\0';
912
913 result = acpi_thermal_set_cooling_mode(tz,
914 simple_strtoul(mode_string, NULL,
915 0));
916 if (result)
917 return result;
918
919 acpi_thermal_check(tz);
920
921 return count;
922 }
923
924 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
925 {
926 struct acpi_thermal *tz = seq->private;
927
928
929 if (!tz)
930 goto end;
931
932 if (!tz->polling_frequency) {
933 seq_puts(seq, "<polling disabled>\n");
934 goto end;
935 }
936
937 seq_printf(seq, "polling frequency: %lu seconds\n",
938 (tz->polling_frequency / 10));
939
940 end:
941 return 0;
942 }
943
944 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
945 {
946 return single_open(file, acpi_thermal_polling_seq_show,
947 PDE(inode)->data);
948 }
949
950 static ssize_t
951 acpi_thermal_write_polling(struct file *file,
952 const char __user * buffer,
953 size_t count, loff_t * ppos)
954 {
955 struct seq_file *m = file->private_data;
956 struct acpi_thermal *tz = m->private;
957 int result = 0;
958 char polling_string[12] = { '\0' };
959 int seconds = 0;
960
961
962 if (!tz || (count > sizeof(polling_string) - 1))
963 return -EINVAL;
964
965 if (copy_from_user(polling_string, buffer, count))
966 return -EFAULT;
967
968 polling_string[count] = '\0';
969
970 seconds = simple_strtoul(polling_string, NULL, 0);
971
972 result = acpi_thermal_set_polling(tz, seconds);
973 if (result)
974 return result;
975
976 acpi_thermal_check(tz);
977
978 return count;
979 }
980
981 static int acpi_thermal_add_fs(struct acpi_device *device)
982 {
983 struct proc_dir_entry *entry = NULL;
984
985
986 if (!acpi_device_dir(device)) {
987 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
988 acpi_thermal_dir);
989 if (!acpi_device_dir(device))
990 return -ENODEV;
991 acpi_device_dir(device)->owner = THIS_MODULE;
992 }
993
994 /* 'state' [R] */
995 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
996 S_IRUGO, acpi_device_dir(device));
997 if (!entry)
998 return -ENODEV;
999 else {
1000 entry->proc_fops = &acpi_thermal_state_fops;
1001 entry->data = acpi_driver_data(device);
1002 entry->owner = THIS_MODULE;
1003 }
1004
1005 /* 'temperature' [R] */
1006 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1007 S_IRUGO, acpi_device_dir(device));
1008 if (!entry)
1009 return -ENODEV;
1010 else {
1011 entry->proc_fops = &acpi_thermal_temp_fops;
1012 entry->data = acpi_driver_data(device);
1013 entry->owner = THIS_MODULE;
1014 }
1015
1016 /* 'trip_points' [R/W] */
1017 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1018 S_IFREG | S_IRUGO | S_IWUSR,
1019 acpi_device_dir(device));
1020 if (!entry)
1021 return -ENODEV;
1022 else {
1023 entry->proc_fops = &acpi_thermal_trip_fops;
1024 entry->data = acpi_driver_data(device);
1025 entry->owner = THIS_MODULE;
1026 }
1027
1028 /* 'cooling_mode' [R/W] */
1029 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1030 S_IFREG | S_IRUGO | S_IWUSR,
1031 acpi_device_dir(device));
1032 if (!entry)
1033 return -ENODEV;
1034 else {
1035 entry->proc_fops = &acpi_thermal_cooling_fops;
1036 entry->data = acpi_driver_data(device);
1037 entry->owner = THIS_MODULE;
1038 }
1039
1040 /* 'polling_frequency' [R/W] */
1041 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1042 S_IFREG | S_IRUGO | S_IWUSR,
1043 acpi_device_dir(device));
1044 if (!entry)
1045 return -ENODEV;
1046 else {
1047 entry->proc_fops = &acpi_thermal_polling_fops;
1048 entry->data = acpi_driver_data(device);
1049 entry->owner = THIS_MODULE;
1050 }
1051
1052 return 0;
1053 }
1054
1055 static int acpi_thermal_remove_fs(struct acpi_device *device)
1056 {
1057
1058 if (acpi_device_dir(device)) {
1059 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1060 acpi_device_dir(device));
1061 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1062 acpi_device_dir(device));
1063 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1064 acpi_device_dir(device));
1065 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1066 acpi_device_dir(device));
1067 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1068 acpi_device_dir(device));
1069 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1070 acpi_device_dir(device) = NULL;
1071 }
1072
1073 return 0;
1074 }
1075
1076 /* --------------------------------------------------------------------------
1077 Driver Interface
1078 -------------------------------------------------------------------------- */
1079
1080 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1081 {
1082 struct acpi_thermal *tz = data;
1083 struct acpi_device *device = NULL;
1084
1085
1086 if (!tz)
1087 return;
1088
1089 device = tz->device;
1090
1091 switch (event) {
1092 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1093 acpi_thermal_check(tz);
1094 break;
1095 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1096 acpi_thermal_get_trip_points(tz);
1097 acpi_thermal_check(tz);
1098 acpi_bus_generate_event(device, event, 0);
1099 break;
1100 case ACPI_THERMAL_NOTIFY_DEVICES:
1101 if (tz->flags.devices)
1102 acpi_thermal_get_devices(tz);
1103 acpi_bus_generate_event(device, event, 0);
1104 break;
1105 default:
1106 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1107 "Unsupported event [0x%x]\n", event));
1108 break;
1109 }
1110
1111 return;
1112 }
1113
1114 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1115 {
1116 int result = 0;
1117
1118
1119 if (!tz)
1120 return -EINVAL;
1121
1122 /* Get temperature [_TMP] (required) */
1123 result = acpi_thermal_get_temperature(tz);
1124 if (result)
1125 return result;
1126
1127 /* Get trip points [_CRT, _PSV, etc.] (required) */
1128 result = acpi_thermal_get_trip_points(tz);
1129 if (result)
1130 return result;
1131
1132 /* Set the cooling mode [_SCP] to active cooling (default) */
1133 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1134 if (!result)
1135 tz->flags.cooling_mode = 1;
1136
1137 /* Get default polling frequency [_TZP] (optional) */
1138 if (tzp)
1139 tz->polling_frequency = tzp;
1140 else
1141 acpi_thermal_get_polling_frequency(tz);
1142
1143 /* Get devices in this thermal zone [_TZD] (optional) */
1144 result = acpi_thermal_get_devices(tz);
1145 if (!result)
1146 tz->flags.devices = 1;
1147
1148 return 0;
1149 }
1150
1151 static int acpi_thermal_add(struct acpi_device *device)
1152 {
1153 int result = 0;
1154 acpi_status status = AE_OK;
1155 struct acpi_thermal *tz = NULL;
1156
1157
1158 if (!device)
1159 return -EINVAL;
1160
1161 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1162 if (!tz)
1163 return -ENOMEM;
1164
1165 tz->device = device;
1166 strcpy(tz->name, device->pnp.bus_id);
1167 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1168 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1169 acpi_driver_data(device) = tz;
1170
1171 result = acpi_thermal_get_info(tz);
1172 if (result)
1173 goto end;
1174
1175 result = acpi_thermal_add_fs(device);
1176 if (result)
1177 goto end;
1178
1179 init_timer(&tz->timer);
1180
1181 acpi_thermal_check(tz);
1182
1183 status = acpi_install_notify_handler(device->handle,
1184 ACPI_DEVICE_NOTIFY,
1185 acpi_thermal_notify, tz);
1186 if (ACPI_FAILURE(status)) {
1187 result = -ENODEV;
1188 goto end;
1189 }
1190
1191 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1192 acpi_device_name(device), acpi_device_bid(device),
1193 KELVIN_TO_CELSIUS(tz->temperature));
1194
1195 end:
1196 if (result) {
1197 acpi_thermal_remove_fs(device);
1198 kfree(tz);
1199 }
1200
1201 return result;
1202 }
1203
1204 static int acpi_thermal_remove(struct acpi_device *device, int type)
1205 {
1206 acpi_status status = AE_OK;
1207 struct acpi_thermal *tz = NULL;
1208
1209
1210 if (!device || !acpi_driver_data(device))
1211 return -EINVAL;
1212
1213 tz = acpi_driver_data(device);
1214
1215 /* avoid timer adding new defer task */
1216 tz->zombie = 1;
1217 /* wait for running timer (on other CPUs) finish */
1218 del_timer_sync(&(tz->timer));
1219 /* synchronize deferred task */
1220 acpi_os_wait_events_complete(NULL);
1221 /* deferred task may reinsert timer */
1222 del_timer_sync(&(tz->timer));
1223
1224 status = acpi_remove_notify_handler(device->handle,
1225 ACPI_DEVICE_NOTIFY,
1226 acpi_thermal_notify);
1227
1228 /* Terminate policy */
1229 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1230 tz->trips.passive.flags.enabled = 0;
1231 acpi_thermal_passive(tz);
1232 }
1233 if (tz->trips.active[0].flags.valid
1234 && tz->trips.active[0].flags.enabled) {
1235 tz->trips.active[0].flags.enabled = 0;
1236 acpi_thermal_active(tz);
1237 }
1238
1239 acpi_thermal_remove_fs(device);
1240
1241 kfree(tz);
1242 return 0;
1243 }
1244
1245 static int acpi_thermal_resume(struct acpi_device *device)
1246 {
1247 struct acpi_thermal *tz = NULL;
1248 int i, j, power_state, result;
1249
1250
1251 if (!device || !acpi_driver_data(device))
1252 return -EINVAL;
1253
1254 tz = acpi_driver_data(device);
1255
1256 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1257 if (!(&tz->trips.active[i]))
1258 break;
1259 if (!tz->trips.active[i].flags.valid)
1260 break;
1261 tz->trips.active[i].flags.enabled = 1;
1262 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1263 result = acpi_bus_get_power(tz->trips.active[i].devices.
1264 handles[j], &power_state);
1265 if (result || (power_state != ACPI_STATE_D0)) {
1266 tz->trips.active[i].flags.enabled = 0;
1267 break;
1268 }
1269 }
1270 tz->state.active |= tz->trips.active[i].flags.enabled;
1271 }
1272
1273 acpi_thermal_check(tz);
1274
1275 return AE_OK;
1276 }
1277
1278 static int __init acpi_thermal_init(void)
1279 {
1280 int result = 0;
1281
1282
1283 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1284 if (!acpi_thermal_dir)
1285 return -ENODEV;
1286 acpi_thermal_dir->owner = THIS_MODULE;
1287
1288 result = acpi_bus_register_driver(&acpi_thermal_driver);
1289 if (result < 0) {
1290 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1291 return -ENODEV;
1292 }
1293
1294 return 0;
1295 }
1296
1297 static void __exit acpi_thermal_exit(void)
1298 {
1299
1300 acpi_bus_unregister_driver(&acpi_thermal_driver);
1301
1302 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1303
1304 return;
1305 }
1306
1307 module_init(acpi_thermal_init);
1308 module_exit(acpi_thermal_exit);
USB Experimental Work