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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...
[mirror_ubuntu-artful-kernel.git] / drivers / acpi / thermal.c
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/dmi.h>
37 #include <linux/init.h>
38 #include <linux/types.h>
39 #include <linux/proc_fs.h>
40 #include <linux/timer.h>
41 #include <linux/jiffies.h>
42 #include <linux/kmod.h>
43 #include <linux/seq_file.h>
44 #include <linux/reboot.h>
45 #include <asm/uaccess.h>
46 #include <linux/thermal.h>
47 #include <acpi/acpi_bus.h>
48 #include <acpi/acpi_drivers.h>
49
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 _COMPONENT ACPI_THERMAL_COMPONENT
68 ACPI_MODULE_NAME("thermal");
69
70 MODULE_AUTHOR("Paul Diefenbaugh");
71 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
72 MODULE_LICENSE("GPL");
73
74 static int act;
75 module_param(act, int, 0644);
76 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
77
78 static int crt;
79 module_param(crt, int, 0644);
80 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
81
82 static int tzp;
83 module_param(tzp, int, 0444);
84 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
85
86 static int nocrt;
87 module_param(nocrt, int, 0);
88 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
89
90 static int off;
91 module_param(off, int, 0);
92 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
93
94 static int psv;
95 module_param(psv, int, 0644);
96 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
97
98 static int acpi_thermal_add(struct acpi_device *device);
99 static int acpi_thermal_remove(struct acpi_device *device, int type);
100 static int acpi_thermal_resume(struct acpi_device *device);
101 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
102 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
103 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
104 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
105 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
106 const char __user *, size_t,
107 loff_t *);
108 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
109 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
110 size_t, loff_t *);
111
112 static const struct acpi_device_id thermal_device_ids[] = {
113 {ACPI_THERMAL_HID, 0},
114 {"", 0},
115 };
116 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
117
118 static struct acpi_driver acpi_thermal_driver = {
119 .name = "thermal",
120 .class = ACPI_THERMAL_CLASS,
121 .ids = thermal_device_ids,
122 .ops = {
123 .add = acpi_thermal_add,
124 .remove = acpi_thermal_remove,
125 .resume = acpi_thermal_resume,
126 },
127 };
128
129 struct acpi_thermal_state {
130 u8 critical:1;
131 u8 hot:1;
132 u8 passive:1;
133 u8 active:1;
134 u8 reserved:4;
135 int active_index;
136 };
137
138 struct acpi_thermal_state_flags {
139 u8 valid:1;
140 u8 enabled:1;
141 u8 reserved:6;
142 };
143
144 struct acpi_thermal_critical {
145 struct acpi_thermal_state_flags flags;
146 unsigned long temperature;
147 };
148
149 struct acpi_thermal_hot {
150 struct acpi_thermal_state_flags flags;
151 unsigned long temperature;
152 };
153
154 struct acpi_thermal_passive {
155 struct acpi_thermal_state_flags flags;
156 unsigned long temperature;
157 unsigned long tc1;
158 unsigned long tc2;
159 unsigned long tsp;
160 struct acpi_handle_list devices;
161 };
162
163 struct acpi_thermal_active {
164 struct acpi_thermal_state_flags flags;
165 unsigned long temperature;
166 struct acpi_handle_list devices;
167 };
168
169 struct acpi_thermal_trips {
170 struct acpi_thermal_critical critical;
171 struct acpi_thermal_hot hot;
172 struct acpi_thermal_passive passive;
173 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
174 };
175
176 struct acpi_thermal_flags {
177 u8 cooling_mode:1; /* _SCP */
178 u8 devices:1; /* _TZD */
179 u8 reserved:6;
180 };
181
182 struct acpi_thermal {
183 struct acpi_device * device;
184 acpi_bus_id name;
185 unsigned long temperature;
186 unsigned long last_temperature;
187 unsigned long polling_frequency;
188 volatile u8 zombie;
189 struct acpi_thermal_flags flags;
190 struct acpi_thermal_state state;
191 struct acpi_thermal_trips trips;
192 struct acpi_handle_list devices;
193 struct timer_list timer;
194 struct thermal_zone_device *thermal_zone;
195 int tz_enabled;
196 struct mutex lock;
197 };
198
199 static const struct file_operations acpi_thermal_state_fops = {
200 .owner = THIS_MODULE,
201 .open = acpi_thermal_state_open_fs,
202 .read = seq_read,
203 .llseek = seq_lseek,
204 .release = single_release,
205 };
206
207 static const struct file_operations acpi_thermal_temp_fops = {
208 .owner = THIS_MODULE,
209 .open = acpi_thermal_temp_open_fs,
210 .read = seq_read,
211 .llseek = seq_lseek,
212 .release = single_release,
213 };
214
215 static const struct file_operations acpi_thermal_trip_fops = {
216 .owner = THIS_MODULE,
217 .open = acpi_thermal_trip_open_fs,
218 .read = seq_read,
219 .llseek = seq_lseek,
220 .release = single_release,
221 };
222
223 static const struct file_operations acpi_thermal_cooling_fops = {
224 .owner = THIS_MODULE,
225 .open = acpi_thermal_cooling_open_fs,
226 .read = seq_read,
227 .write = acpi_thermal_write_cooling_mode,
228 .llseek = seq_lseek,
229 .release = single_release,
230 };
231
232 static const struct file_operations acpi_thermal_polling_fops = {
233 .owner = THIS_MODULE,
234 .open = acpi_thermal_polling_open_fs,
235 .read = seq_read,
236 .write = acpi_thermal_write_polling,
237 .llseek = seq_lseek,
238 .release = single_release,
239 };
240
241 /* --------------------------------------------------------------------------
242 Thermal Zone Management
243 -------------------------------------------------------------------------- */
244
245 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
246 {
247 acpi_status status = AE_OK;
248 unsigned long long tmp;
249
250 if (!tz)
251 return -EINVAL;
252
253 tz->last_temperature = tz->temperature;
254
255 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
256 if (ACPI_FAILURE(status))
257 return -ENODEV;
258
259 tz->temperature = tmp;
260 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
261 tz->temperature));
262
263 return 0;
264 }
265
266 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
267 {
268 acpi_status status = AE_OK;
269 unsigned long long tmp;
270
271 if (!tz)
272 return -EINVAL;
273
274 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
275 if (ACPI_FAILURE(status))
276 return -ENODEV;
277
278 tz->polling_frequency = tmp;
279 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
280 tz->polling_frequency));
281
282 return 0;
283 }
284
285 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
286 {
287
288 if (!tz)
289 return -EINVAL;
290
291 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */
292
293 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
294 "Polling frequency set to %lu seconds\n",
295 tz->polling_frequency/10));
296
297 return 0;
298 }
299
300 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
301 {
302 acpi_status status = AE_OK;
303 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
304 struct acpi_object_list arg_list = { 1, &arg0 };
305 acpi_handle handle = NULL;
306
307
308 if (!tz)
309 return -EINVAL;
310
311 status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
312 if (ACPI_FAILURE(status)) {
313 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
314 return -ENODEV;
315 }
316
317 arg0.integer.value = mode;
318
319 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
320 if (ACPI_FAILURE(status))
321 return -ENODEV;
322
323 return 0;
324 }
325
326 #define ACPI_TRIPS_CRITICAL 0x01
327 #define ACPI_TRIPS_HOT 0x02
328 #define ACPI_TRIPS_PASSIVE 0x04
329 #define ACPI_TRIPS_ACTIVE 0x08
330 #define ACPI_TRIPS_DEVICES 0x10
331
332 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
333 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
334
335 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
336 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
337 ACPI_TRIPS_DEVICES)
338
339 /*
340 * This exception is thrown out in two cases:
341 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
342 * when re-evaluating the AML code.
343 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
344 * We need to re-bind the cooling devices of a thermal zone when this occurs.
345 */
346 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
347 do { \
348 if (flags != ACPI_TRIPS_INIT) \
349 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
350 "ACPI thermal trip point %s changed\n" \
351 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
352 } while (0)
353
354 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
355 {
356 acpi_status status = AE_OK;
357 unsigned long long tmp;
358 struct acpi_handle_list devices;
359 int valid = 0;
360 int i;
361
362 /* Critical Shutdown (required) */
363 if (flag & ACPI_TRIPS_CRITICAL) {
364 status = acpi_evaluate_integer(tz->device->handle,
365 "_CRT", NULL, &tmp);
366 tz->trips.critical.temperature = tmp;
367 /*
368 * Treat freezing temperatures as invalid as well; some
369 * BIOSes return really low values and cause reboots at startup.
370 * Below zero (Celcius) values clearly aren't right for sure..
371 * ... so lets discard those as invalid.
372 */
373 if (ACPI_FAILURE(status) ||
374 tz->trips.critical.temperature <= 2732) {
375 tz->trips.critical.flags.valid = 0;
376 ACPI_EXCEPTION((AE_INFO, status,
377 "No or invalid critical threshold"));
378 return -ENODEV;
379 } else {
380 tz->trips.critical.flags.valid = 1;
381 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
382 "Found critical threshold [%lu]\n",
383 tz->trips.critical.temperature));
384 }
385 if (tz->trips.critical.flags.valid == 1) {
386 if (crt == -1) {
387 tz->trips.critical.flags.valid = 0;
388 } else if (crt > 0) {
389 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
390 /*
391 * Allow override critical threshold
392 */
393 if (crt_k > tz->trips.critical.temperature)
394 printk(KERN_WARNING PREFIX
395 "Critical threshold %d C\n", crt);
396 tz->trips.critical.temperature = crt_k;
397 }
398 }
399 }
400
401 /* Critical Sleep (optional) */
402 if (flag & ACPI_TRIPS_HOT) {
403 status = acpi_evaluate_integer(tz->device->handle,
404 "_HOT", NULL, &tmp);
405 if (ACPI_FAILURE(status)) {
406 tz->trips.hot.flags.valid = 0;
407 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
408 "No hot threshold\n"));
409 } else {
410 tz->trips.hot.temperature = tmp;
411 tz->trips.hot.flags.valid = 1;
412 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
413 "Found hot threshold [%lu]\n",
414 tz->trips.critical.temperature));
415 }
416 }
417
418 /* Passive (optional) */
419 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
420 (flag == ACPI_TRIPS_INIT)) {
421 valid = tz->trips.passive.flags.valid;
422 if (psv == -1) {
423 status = AE_SUPPORT;
424 } else if (psv > 0) {
425 tmp = CELSIUS_TO_KELVIN(psv);
426 status = AE_OK;
427 } else {
428 status = acpi_evaluate_integer(tz->device->handle,
429 "_PSV", NULL, &tmp);
430 }
431
432 if (ACPI_FAILURE(status))
433 tz->trips.passive.flags.valid = 0;
434 else {
435 tz->trips.passive.temperature = tmp;
436 tz->trips.passive.flags.valid = 1;
437 if (flag == ACPI_TRIPS_INIT) {
438 status = acpi_evaluate_integer(
439 tz->device->handle, "_TC1",
440 NULL, &tmp);
441 if (ACPI_FAILURE(status))
442 tz->trips.passive.flags.valid = 0;
443 else
444 tz->trips.passive.tc1 = tmp;
445 status = acpi_evaluate_integer(
446 tz->device->handle, "_TC2",
447 NULL, &tmp);
448 if (ACPI_FAILURE(status))
449 tz->trips.passive.flags.valid = 0;
450 else
451 tz->trips.passive.tc2 = tmp;
452 status = acpi_evaluate_integer(
453 tz->device->handle, "_TSP",
454 NULL, &tmp);
455 if (ACPI_FAILURE(status))
456 tz->trips.passive.flags.valid = 0;
457 else
458 tz->trips.passive.tsp = tmp;
459 }
460 }
461 }
462 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
463 memset(&devices, 0, sizeof(struct acpi_handle_list));
464 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
465 NULL, &devices);
466 if (ACPI_FAILURE(status)) {
467 printk(KERN_WARNING PREFIX
468 "Invalid passive threshold\n");
469 tz->trips.passive.flags.valid = 0;
470 }
471 else
472 tz->trips.passive.flags.valid = 1;
473
474 if (memcmp(&tz->trips.passive.devices, &devices,
475 sizeof(struct acpi_handle_list))) {
476 memcpy(&tz->trips.passive.devices, &devices,
477 sizeof(struct acpi_handle_list));
478 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
479 }
480 }
481 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
482 if (valid != tz->trips.passive.flags.valid)
483 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
484 }
485
486 /* Active (optional) */
487 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
488 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
489 valid = tz->trips.active[i].flags.valid;
490
491 if (act == -1)
492 break; /* disable all active trip points */
493
494 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
495 tz->trips.active[i].flags.valid)) {
496 status = acpi_evaluate_integer(tz->device->handle,
497 name, NULL, &tmp);
498 if (ACPI_FAILURE(status)) {
499 tz->trips.active[i].flags.valid = 0;
500 if (i == 0)
501 break;
502 if (act <= 0)
503 break;
504 if (i == 1)
505 tz->trips.active[0].temperature =
506 CELSIUS_TO_KELVIN(act);
507 else
508 /*
509 * Don't allow override higher than
510 * the next higher trip point
511 */
512 tz->trips.active[i - 1].temperature =
513 (tz->trips.active[i - 2].temperature <
514 CELSIUS_TO_KELVIN(act) ?
515 tz->trips.active[i - 2].temperature :
516 CELSIUS_TO_KELVIN(act));
517 break;
518 } else {
519 tz->trips.active[i].temperature = tmp;
520 tz->trips.active[i].flags.valid = 1;
521 }
522 }
523
524 name[2] = 'L';
525 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
526 memset(&devices, 0, sizeof(struct acpi_handle_list));
527 status = acpi_evaluate_reference(tz->device->handle,
528 name, NULL, &devices);
529 if (ACPI_FAILURE(status)) {
530 printk(KERN_WARNING PREFIX
531 "Invalid active%d threshold\n", i);
532 tz->trips.active[i].flags.valid = 0;
533 }
534 else
535 tz->trips.active[i].flags.valid = 1;
536
537 if (memcmp(&tz->trips.active[i].devices, &devices,
538 sizeof(struct acpi_handle_list))) {
539 memcpy(&tz->trips.active[i].devices, &devices,
540 sizeof(struct acpi_handle_list));
541 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
542 }
543 }
544 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
545 if (valid != tz->trips.active[i].flags.valid)
546 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
547
548 if (!tz->trips.active[i].flags.valid)
549 break;
550 }
551
552 if (flag & ACPI_TRIPS_DEVICES) {
553 memset(&devices, 0, sizeof(struct acpi_handle_list));
554 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
555 NULL, &devices);
556 if (memcmp(&tz->devices, &devices,
557 sizeof(struct acpi_handle_list))) {
558 memcpy(&tz->devices, &devices,
559 sizeof(struct acpi_handle_list));
560 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
561 }
562 }
563
564 return 0;
565 }
566
567 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
568 {
569 return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
570 }
571
572 static int acpi_thermal_critical(struct acpi_thermal *tz)
573 {
574 if (!tz || !tz->trips.critical.flags.valid)
575 return -EINVAL;
576
577 if (tz->temperature >= tz->trips.critical.temperature) {
578 printk(KERN_WARNING PREFIX "Critical trip point\n");
579 tz->trips.critical.flags.enabled = 1;
580 } else if (tz->trips.critical.flags.enabled)
581 tz->trips.critical.flags.enabled = 0;
582
583 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
584 tz->trips.critical.flags.enabled);
585 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
586 dev_name(&tz->device->dev),
587 ACPI_THERMAL_NOTIFY_CRITICAL,
588 tz->trips.critical.flags.enabled);
589
590 /* take no action if nocrt is set */
591 if(!nocrt) {
592 printk(KERN_EMERG
593 "Critical temperature reached (%ld C), shutting down.\n",
594 KELVIN_TO_CELSIUS(tz->temperature));
595 orderly_poweroff(true);
596 }
597
598 return 0;
599 }
600
601 static int acpi_thermal_hot(struct acpi_thermal *tz)
602 {
603 if (!tz || !tz->trips.hot.flags.valid)
604 return -EINVAL;
605
606 if (tz->temperature >= tz->trips.hot.temperature) {
607 printk(KERN_WARNING PREFIX "Hot trip point\n");
608 tz->trips.hot.flags.enabled = 1;
609 } else if (tz->trips.hot.flags.enabled)
610 tz->trips.hot.flags.enabled = 0;
611
612 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
613 tz->trips.hot.flags.enabled);
614 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
615 dev_name(&tz->device->dev),
616 ACPI_THERMAL_NOTIFY_HOT,
617 tz->trips.hot.flags.enabled);
618
619 /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
620
621 return 0;
622 }
623
624 static void acpi_thermal_passive(struct acpi_thermal *tz)
625 {
626 int result = 1;
627 struct acpi_thermal_passive *passive = NULL;
628 int trend = 0;
629 int i = 0;
630
631
632 if (!tz || !tz->trips.passive.flags.valid)
633 return;
634
635 passive = &(tz->trips.passive);
636
637 /*
638 * Above Trip?
639 * -----------
640 * Calculate the thermal trend (using the passive cooling equation)
641 * and modify the performance limit for all passive cooling devices
642 * accordingly. Note that we assume symmetry.
643 */
644 if (tz->temperature >= passive->temperature) {
645 trend =
646 (passive->tc1 * (tz->temperature - tz->last_temperature)) +
647 (passive->tc2 * (tz->temperature - passive->temperature));
648 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
649 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
650 trend, passive->tc1, tz->temperature,
651 tz->last_temperature, passive->tc2,
652 tz->temperature, passive->temperature));
653 passive->flags.enabled = 1;
654 /* Heating up? */
655 if (trend > 0)
656 for (i = 0; i < passive->devices.count; i++)
657 acpi_processor_set_thermal_limit(passive->
658 devices.
659 handles[i],
660 ACPI_PROCESSOR_LIMIT_INCREMENT);
661 /* Cooling off? */
662 else if (trend < 0) {
663 for (i = 0; i < passive->devices.count; i++)
664 /*
665 * assume that we are on highest
666 * freq/lowest thrott and can leave
667 * passive mode, even in error case
668 */
669 if (!acpi_processor_set_thermal_limit
670 (passive->devices.handles[i],
671 ACPI_PROCESSOR_LIMIT_DECREMENT))
672 result = 0;
673 /*
674 * Leave cooling mode, even if the temp might
675 * higher than trip point This is because some
676 * machines might have long thermal polling
677 * frequencies (tsp) defined. We will fall back
678 * into passive mode in next cycle (probably quicker)
679 */
680 if (result) {
681 passive->flags.enabled = 0;
682 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
683 "Disabling passive cooling, still above threshold,"
684 " but we are cooling down\n"));
685 }
686 }
687 return;
688 }
689
690 /*
691 * Below Trip?
692 * -----------
693 * Implement passive cooling hysteresis to slowly increase performance
694 * and avoid thrashing around the passive trip point. Note that we
695 * assume symmetry.
696 */
697 if (!passive->flags.enabled)
698 return;
699 for (i = 0; i < passive->devices.count; i++)
700 if (!acpi_processor_set_thermal_limit
701 (passive->devices.handles[i],
702 ACPI_PROCESSOR_LIMIT_DECREMENT))
703 result = 0;
704 if (result) {
705 passive->flags.enabled = 0;
706 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
707 "Disabling passive cooling (zone is cool)\n"));
708 }
709 }
710
711 static void acpi_thermal_active(struct acpi_thermal *tz)
712 {
713 int result = 0;
714 struct acpi_thermal_active *active = NULL;
715 int i = 0;
716 int j = 0;
717 unsigned long maxtemp = 0;
718
719
720 if (!tz)
721 return;
722
723 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
724 active = &(tz->trips.active[i]);
725 if (!active || !active->flags.valid)
726 break;
727 if (tz->temperature >= active->temperature) {
728 /*
729 * Above Threshold?
730 * ----------------
731 * If not already enabled, turn ON all cooling devices
732 * associated with this active threshold.
733 */
734 if (active->temperature > maxtemp)
735 tz->state.active_index = i;
736 maxtemp = active->temperature;
737 if (active->flags.enabled)
738 continue;
739 for (j = 0; j < active->devices.count; j++) {
740 result =
741 acpi_bus_set_power(active->devices.
742 handles[j],
743 ACPI_STATE_D0);
744 if (result) {
745 printk(KERN_WARNING PREFIX
746 "Unable to turn cooling device [%p] 'on'\n",
747 active->devices.
748 handles[j]);
749 continue;
750 }
751 active->flags.enabled = 1;
752 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
753 "Cooling device [%p] now 'on'\n",
754 active->devices.handles[j]));
755 }
756 continue;
757 }
758 if (!active->flags.enabled)
759 continue;
760 /*
761 * Below Threshold?
762 * ----------------
763 * Turn OFF all cooling devices associated with this
764 * threshold.
765 */
766 for (j = 0; j < active->devices.count; j++) {
767 result = acpi_bus_set_power(active->devices.handles[j],
768 ACPI_STATE_D3);
769 if (result) {
770 printk(KERN_WARNING PREFIX
771 "Unable to turn cooling device [%p] 'off'\n",
772 active->devices.handles[j]);
773 continue;
774 }
775 active->flags.enabled = 0;
776 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
777 "Cooling device [%p] now 'off'\n",
778 active->devices.handles[j]));
779 }
780 }
781 }
782
783 static void acpi_thermal_check(void *context);
784
785 static void acpi_thermal_run(unsigned long data)
786 {
787 struct acpi_thermal *tz = (struct acpi_thermal *)data;
788 if (!tz->zombie)
789 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
790 }
791
792 static void acpi_thermal_active_off(void *data)
793 {
794 int result = 0;
795 struct acpi_thermal *tz = data;
796 int i = 0;
797 int j = 0;
798 struct acpi_thermal_active *active = NULL;
799
800 if (!tz) {
801 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
802 return;
803 }
804
805 result = acpi_thermal_get_temperature(tz);
806 if (result)
807 return;
808
809 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
810 active = &(tz->trips.active[i]);
811 if (!active || !active->flags.valid)
812 break;
813 if (tz->temperature >= active->temperature) {
814 /*
815 * If the thermal temperature is greater than the
816 * active threshod, unnecessary to turn off the
817 * the active cooling device.
818 */
819 continue;
820 }
821 /*
822 * Below Threshold?
823 * ----------------
824 * Turn OFF all cooling devices associated with this
825 * threshold.
826 */
827 for (j = 0; j < active->devices.count; j++)
828 result = acpi_bus_set_power(active->devices.handles[j],
829 ACPI_STATE_D3);
830 }
831 }
832
833 static void acpi_thermal_check(void *data)
834 {
835 int result = 0;
836 struct acpi_thermal *tz = data;
837 unsigned long sleep_time = 0;
838 unsigned long timeout_jiffies = 0;
839 int i = 0;
840 struct acpi_thermal_state state;
841
842
843 if (!tz) {
844 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
845 return;
846 }
847
848 /* Check if someone else is already running */
849 if (!mutex_trylock(&tz->lock))
850 return;
851
852 state = tz->state;
853
854 result = acpi_thermal_get_temperature(tz);
855 if (result)
856 goto unlock;
857
858 if (!tz->tz_enabled)
859 goto unlock;
860
861 memset(&tz->state, 0, sizeof(tz->state));
862
863 /*
864 * Check Trip Points
865 * -----------------
866 * Compare the current temperature to the trip point values to see
867 * if we've entered one of the thermal policy states. Note that
868 * this function determines when a state is entered, but the
869 * individual policy decides when it is exited (e.g. hysteresis).
870 */
871 if (tz->trips.critical.flags.valid)
872 state.critical |=
873 (tz->temperature >= tz->trips.critical.temperature);
874 if (tz->trips.hot.flags.valid)
875 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
876 if (tz->trips.passive.flags.valid)
877 state.passive |=
878 (tz->temperature >= tz->trips.passive.temperature);
879 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
880 if (tz->trips.active[i].flags.valid)
881 state.active |=
882 (tz->temperature >=
883 tz->trips.active[i].temperature);
884
885 /*
886 * Invoke Policy
887 * -------------
888 * Separated from the above check to allow individual policy to
889 * determine when to exit a given state.
890 */
891 if (state.critical)
892 acpi_thermal_critical(tz);
893 if (state.hot)
894 acpi_thermal_hot(tz);
895 if (state.passive)
896 acpi_thermal_passive(tz);
897 if (state.active)
898 acpi_thermal_active(tz);
899
900 /*
901 * Calculate State
902 * ---------------
903 * Again, separated from the above two to allow independent policy
904 * decisions.
905 */
906 tz->state.critical = tz->trips.critical.flags.enabled;
907 tz->state.hot = tz->trips.hot.flags.enabled;
908 tz->state.passive = tz->trips.passive.flags.enabled;
909 tz->state.active = 0;
910 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
911 tz->state.active |= tz->trips.active[i].flags.enabled;
912
913 /*
914 * Calculate Sleep Time
915 * --------------------
916 * If we're in the passive state, use _TSP's value. Otherwise
917 * use the default polling frequency (e.g. _TZP). If no polling
918 * frequency is specified then we'll wait forever (at least until
919 * a thermal event occurs). Note that _TSP and _TZD values are
920 * given in 1/10th seconds (we must covert to milliseconds).
921 */
922 if (tz->state.passive) {
923 sleep_time = tz->trips.passive.tsp * 100;
924 timeout_jiffies = jiffies + (HZ * sleep_time) / 1000;
925 } else if (tz->polling_frequency > 0) {
926 sleep_time = tz->polling_frequency * 100;
927 timeout_jiffies = round_jiffies(jiffies + (HZ * sleep_time) / 1000);
928 }
929
930 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
931 tz->name, tz->temperature, sleep_time));
932
933 /*
934 * Schedule Next Poll
935 * ------------------
936 */
937 if (!sleep_time) {
938 if (timer_pending(&(tz->timer)))
939 del_timer(&(tz->timer));
940 } else {
941 if (timer_pending(&(tz->timer)))
942 mod_timer(&(tz->timer), timeout_jiffies);
943 else {
944 tz->timer.data = (unsigned long)tz;
945 tz->timer.function = acpi_thermal_run;
946 tz->timer.expires = timeout_jiffies;
947 add_timer(&(tz->timer));
948 }
949 }
950 unlock:
951 mutex_unlock(&tz->lock);
952 }
953
954 /* sys I/F for generic thermal sysfs support */
955 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
956
957 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
958 {
959 struct acpi_thermal *tz = thermal->devdata;
960 int result;
961
962 if (!tz)
963 return -EINVAL;
964
965 result = acpi_thermal_get_temperature(tz);
966 if (result)
967 return result;
968
969 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature));
970 }
971
972 static const char enabled[] = "kernel";
973 static const char disabled[] = "user";
974 static int thermal_get_mode(struct thermal_zone_device *thermal,
975 char *buf)
976 {
977 struct acpi_thermal *tz = thermal->devdata;
978
979 if (!tz)
980 return -EINVAL;
981
982 return sprintf(buf, "%s\n", tz->tz_enabled ?
983 enabled : disabled);
984 }
985
986 static int thermal_set_mode(struct thermal_zone_device *thermal,
987 const char *buf)
988 {
989 struct acpi_thermal *tz = thermal->devdata;
990 int enable;
991
992 if (!tz)
993 return -EINVAL;
994
995 /*
996 * enable/disable thermal management from ACPI thermal driver
997 */
998 if (!strncmp(buf, enabled, sizeof enabled - 1))
999 enable = 1;
1000 else if (!strncmp(buf, disabled, sizeof disabled - 1))
1001 enable = 0;
1002 else
1003 return -EINVAL;
1004
1005 if (enable != tz->tz_enabled) {
1006 tz->tz_enabled = enable;
1007 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1008 "%s ACPI thermal control\n",
1009 tz->tz_enabled ? enabled : disabled));
1010 acpi_thermal_check(tz);
1011 }
1012 return 0;
1013 }
1014
1015 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
1016 int trip, char *buf)
1017 {
1018 struct acpi_thermal *tz = thermal->devdata;
1019 int i;
1020
1021 if (!tz || trip < 0)
1022 return -EINVAL;
1023
1024 if (tz->trips.critical.flags.valid) {
1025 if (!trip)
1026 return sprintf(buf, "critical\n");
1027 trip--;
1028 }
1029
1030 if (tz->trips.hot.flags.valid) {
1031 if (!trip)
1032 return sprintf(buf, "hot\n");
1033 trip--;
1034 }
1035
1036 if (tz->trips.passive.flags.valid) {
1037 if (!trip)
1038 return sprintf(buf, "passive\n");
1039 trip--;
1040 }
1041
1042 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1043 tz->trips.active[i].flags.valid; i++) {
1044 if (!trip)
1045 return sprintf(buf, "active%d\n", i);
1046 trip--;
1047 }
1048
1049 return -EINVAL;
1050 }
1051
1052 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
1053 int trip, char *buf)
1054 {
1055 struct acpi_thermal *tz = thermal->devdata;
1056 int i;
1057
1058 if (!tz || trip < 0)
1059 return -EINVAL;
1060
1061 if (tz->trips.critical.flags.valid) {
1062 if (!trip)
1063 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1064 tz->trips.critical.temperature));
1065 trip--;
1066 }
1067
1068 if (tz->trips.hot.flags.valid) {
1069 if (!trip)
1070 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1071 tz->trips.hot.temperature));
1072 trip--;
1073 }
1074
1075 if (tz->trips.passive.flags.valid) {
1076 if (!trip)
1077 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1078 tz->trips.passive.temperature));
1079 trip--;
1080 }
1081
1082 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1083 tz->trips.active[i].flags.valid; i++) {
1084 if (!trip)
1085 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1086 tz->trips.active[i].temperature));
1087 trip--;
1088 }
1089
1090 return -EINVAL;
1091 }
1092
1093 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
1094 unsigned long *temperature) {
1095 struct acpi_thermal *tz = thermal->devdata;
1096
1097 if (tz->trips.critical.flags.valid) {
1098 *temperature = KELVIN_TO_MILLICELSIUS(
1099 tz->trips.critical.temperature);
1100 return 0;
1101 } else
1102 return -EINVAL;
1103 }
1104
1105 typedef int (*cb)(struct thermal_zone_device *, int,
1106 struct thermal_cooling_device *);
1107 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
1108 struct thermal_cooling_device *cdev,
1109 cb action)
1110 {
1111 struct acpi_device *device = cdev->devdata;
1112 struct acpi_thermal *tz = thermal->devdata;
1113 struct acpi_device *dev;
1114 acpi_status status;
1115 acpi_handle handle;
1116 int i;
1117 int j;
1118 int trip = -1;
1119 int result = 0;
1120
1121 if (tz->trips.critical.flags.valid)
1122 trip++;
1123
1124 if (tz->trips.hot.flags.valid)
1125 trip++;
1126
1127 if (tz->trips.passive.flags.valid) {
1128 trip++;
1129 for (i = 0; i < tz->trips.passive.devices.count;
1130 i++) {
1131 handle = tz->trips.passive.devices.handles[i];
1132 status = acpi_bus_get_device(handle, &dev);
1133 if (ACPI_SUCCESS(status) && (dev == device)) {
1134 result = action(thermal, trip, cdev);
1135 if (result)
1136 goto failed;
1137 }
1138 }
1139 }
1140
1141 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1142 if (!tz->trips.active[i].flags.valid)
1143 break;
1144 trip++;
1145 for (j = 0;
1146 j < tz->trips.active[i].devices.count;
1147 j++) {
1148 handle = tz->trips.active[i].devices.handles[j];
1149 status = acpi_bus_get_device(handle, &dev);
1150 if (ACPI_SUCCESS(status) && (dev == device)) {
1151 result = action(thermal, trip, cdev);
1152 if (result)
1153 goto failed;
1154 }
1155 }
1156 }
1157
1158 for (i = 0; i < tz->devices.count; i++) {
1159 handle = tz->devices.handles[i];
1160 status = acpi_bus_get_device(handle, &dev);
1161 if (ACPI_SUCCESS(status) && (dev == device)) {
1162 result = action(thermal, -1, cdev);
1163 if (result)
1164 goto failed;
1165 }
1166 }
1167
1168 failed:
1169 return result;
1170 }
1171
1172 static int
1173 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1174 struct thermal_cooling_device *cdev)
1175 {
1176 return acpi_thermal_cooling_device_cb(thermal, cdev,
1177 thermal_zone_bind_cooling_device);
1178 }
1179
1180 static int
1181 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
1182 struct thermal_cooling_device *cdev)
1183 {
1184 return acpi_thermal_cooling_device_cb(thermal, cdev,
1185 thermal_zone_unbind_cooling_device);
1186 }
1187
1188 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1189 .bind = acpi_thermal_bind_cooling_device,
1190 .unbind = acpi_thermal_unbind_cooling_device,
1191 .get_temp = thermal_get_temp,
1192 .get_mode = thermal_get_mode,
1193 .set_mode = thermal_set_mode,
1194 .get_trip_type = thermal_get_trip_type,
1195 .get_trip_temp = thermal_get_trip_temp,
1196 .get_crit_temp = thermal_get_crit_temp,
1197 };
1198
1199 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1200 {
1201 int trips = 0;
1202 int result;
1203 acpi_status status;
1204 int i;
1205
1206 if (tz->trips.critical.flags.valid)
1207 trips++;
1208
1209 if (tz->trips.hot.flags.valid)
1210 trips++;
1211
1212 if (tz->trips.passive.flags.valid)
1213 trips++;
1214
1215 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1216 tz->trips.active[i].flags.valid; i++, trips++);
1217 tz->thermal_zone = thermal_zone_device_register("acpitz",
1218 trips, tz, &acpi_thermal_zone_ops);
1219 if (IS_ERR(tz->thermal_zone))
1220 return -ENODEV;
1221
1222 result = sysfs_create_link(&tz->device->dev.kobj,
1223 &tz->thermal_zone->device.kobj, "thermal_zone");
1224 if (result)
1225 return result;
1226
1227 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1228 &tz->device->dev.kobj, "device");
1229 if (result)
1230 return result;
1231
1232 status = acpi_attach_data(tz->device->handle,
1233 acpi_bus_private_data_handler,
1234 tz->thermal_zone);
1235 if (ACPI_FAILURE(status)) {
1236 printk(KERN_ERR PREFIX
1237 "Error attaching device data\n");
1238 return -ENODEV;
1239 }
1240
1241 tz->tz_enabled = 1;
1242
1243 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
1244 tz->thermal_zone->id);
1245 return 0;
1246 }
1247
1248 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1249 {
1250 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1251 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1252 thermal_zone_device_unregister(tz->thermal_zone);
1253 tz->thermal_zone = NULL;
1254 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
1255 }
1256
1257
1258 /* --------------------------------------------------------------------------
1259 FS Interface (/proc)
1260 -------------------------------------------------------------------------- */
1261
1262 static struct proc_dir_entry *acpi_thermal_dir;
1263
1264 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1265 {
1266 struct acpi_thermal *tz = seq->private;
1267
1268
1269 if (!tz)
1270 goto end;
1271
1272 seq_puts(seq, "state: ");
1273
1274 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1275 && !tz->state.active)
1276 seq_puts(seq, "ok\n");
1277 else {
1278 if (tz->state.critical)
1279 seq_puts(seq, "critical ");
1280 if (tz->state.hot)
1281 seq_puts(seq, "hot ");
1282 if (tz->state.passive)
1283 seq_puts(seq, "passive ");
1284 if (tz->state.active)
1285 seq_printf(seq, "active[%d]", tz->state.active_index);
1286 seq_puts(seq, "\n");
1287 }
1288
1289 end:
1290 return 0;
1291 }
1292
1293 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1294 {
1295 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1296 }
1297
1298 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1299 {
1300 int result = 0;
1301 struct acpi_thermal *tz = seq->private;
1302
1303
1304 if (!tz)
1305 goto end;
1306
1307 result = acpi_thermal_get_temperature(tz);
1308 if (result)
1309 goto end;
1310
1311 seq_printf(seq, "temperature: %ld C\n",
1312 KELVIN_TO_CELSIUS(tz->temperature));
1313
1314 end:
1315 return 0;
1316 }
1317
1318 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1319 {
1320 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1321 }
1322
1323 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1324 {
1325 struct acpi_thermal *tz = seq->private;
1326 struct acpi_device *device;
1327 acpi_status status;
1328
1329 int i = 0;
1330 int j = 0;
1331
1332
1333 if (!tz)
1334 goto end;
1335
1336 if (tz->trips.critical.flags.valid)
1337 seq_printf(seq, "critical (S5): %ld C%s",
1338 KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1339 nocrt ? " <disabled>\n" : "\n");
1340
1341 if (tz->trips.hot.flags.valid)
1342 seq_printf(seq, "hot (S4): %ld C%s",
1343 KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1344 nocrt ? " <disabled>\n" : "\n");
1345
1346 if (tz->trips.passive.flags.valid) {
1347 seq_printf(seq,
1348 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1349 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1350 tz->trips.passive.tc1, tz->trips.passive.tc2,
1351 tz->trips.passive.tsp);
1352 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1353 status = acpi_bus_get_device(tz->trips.passive.devices.
1354 handles[j], &device);
1355 seq_printf(seq, "%4.4s ", status ? "" :
1356 acpi_device_bid(device));
1357 }
1358 seq_puts(seq, "\n");
1359 }
1360
1361 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1362 if (!(tz->trips.active[i].flags.valid))
1363 break;
1364 seq_printf(seq, "active[%d]: %ld C: devices=",
1365 i,
1366 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1367 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1368 status = acpi_bus_get_device(tz->trips.active[i].
1369 devices.handles[j],
1370 &device);
1371 seq_printf(seq, "%4.4s ", status ? "" :
1372 acpi_device_bid(device));
1373 }
1374 seq_puts(seq, "\n");
1375 }
1376
1377 end:
1378 return 0;
1379 }
1380
1381 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1382 {
1383 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1384 }
1385
1386 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1387 {
1388 struct acpi_thermal *tz = seq->private;
1389
1390
1391 if (!tz)
1392 goto end;
1393
1394 if (!tz->flags.cooling_mode)
1395 seq_puts(seq, "<setting not supported>\n");
1396 else
1397 seq_puts(seq, "0 - Active; 1 - Passive\n");
1398
1399 end:
1400 return 0;
1401 }
1402
1403 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1404 {
1405 return single_open(file, acpi_thermal_cooling_seq_show,
1406 PDE(inode)->data);
1407 }
1408
1409 static ssize_t
1410 acpi_thermal_write_cooling_mode(struct file *file,
1411 const char __user * buffer,
1412 size_t count, loff_t * ppos)
1413 {
1414 struct seq_file *m = file->private_data;
1415 struct acpi_thermal *tz = m->private;
1416 int result = 0;
1417 char mode_string[12] = { '\0' };
1418
1419
1420 if (!tz || (count > sizeof(mode_string) - 1))
1421 return -EINVAL;
1422
1423 if (!tz->flags.cooling_mode)
1424 return -ENODEV;
1425
1426 if (copy_from_user(mode_string, buffer, count))
1427 return -EFAULT;
1428
1429 mode_string[count] = '\0';
1430
1431 result = acpi_thermal_set_cooling_mode(tz,
1432 simple_strtoul(mode_string, NULL,
1433 0));
1434 if (result)
1435 return result;
1436
1437 acpi_thermal_check(tz);
1438
1439 return count;
1440 }
1441
1442 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1443 {
1444 struct acpi_thermal *tz = seq->private;
1445
1446
1447 if (!tz)
1448 goto end;
1449
1450 if (!tz->polling_frequency) {
1451 seq_puts(seq, "<polling disabled>\n");
1452 goto end;
1453 }
1454
1455 seq_printf(seq, "polling frequency: %lu seconds\n",
1456 (tz->polling_frequency / 10));
1457
1458 end:
1459 return 0;
1460 }
1461
1462 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1463 {
1464 return single_open(file, acpi_thermal_polling_seq_show,
1465 PDE(inode)->data);
1466 }
1467
1468 static ssize_t
1469 acpi_thermal_write_polling(struct file *file,
1470 const char __user * buffer,
1471 size_t count, loff_t * ppos)
1472 {
1473 struct seq_file *m = file->private_data;
1474 struct acpi_thermal *tz = m->private;
1475 int result = 0;
1476 char polling_string[12] = { '\0' };
1477 int seconds = 0;
1478
1479
1480 if (!tz || (count > sizeof(polling_string) - 1))
1481 return -EINVAL;
1482
1483 if (copy_from_user(polling_string, buffer, count))
1484 return -EFAULT;
1485
1486 polling_string[count] = '\0';
1487
1488 seconds = simple_strtoul(polling_string, NULL, 0);
1489
1490 result = acpi_thermal_set_polling(tz, seconds);
1491 if (result)
1492 return result;
1493
1494 acpi_thermal_check(tz);
1495
1496 return count;
1497 }
1498
1499 static int acpi_thermal_add_fs(struct acpi_device *device)
1500 {
1501 struct proc_dir_entry *entry = NULL;
1502
1503
1504 if (!acpi_device_dir(device)) {
1505 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1506 acpi_thermal_dir);
1507 if (!acpi_device_dir(device))
1508 return -ENODEV;
1509 acpi_device_dir(device)->owner = THIS_MODULE;
1510 }
1511
1512 /* 'state' [R] */
1513 entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1514 S_IRUGO, acpi_device_dir(device),
1515 &acpi_thermal_state_fops,
1516 acpi_driver_data(device));
1517 if (!entry)
1518 return -ENODEV;
1519
1520 /* 'temperature' [R] */
1521 entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1522 S_IRUGO, acpi_device_dir(device),
1523 &acpi_thermal_temp_fops,
1524 acpi_driver_data(device));
1525 if (!entry)
1526 return -ENODEV;
1527
1528 /* 'trip_points' [R] */
1529 entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1530 S_IRUGO,
1531 acpi_device_dir(device),
1532 &acpi_thermal_trip_fops,
1533 acpi_driver_data(device));
1534 if (!entry)
1535 return -ENODEV;
1536
1537 /* 'cooling_mode' [R/W] */
1538 entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1539 S_IFREG | S_IRUGO | S_IWUSR,
1540 acpi_device_dir(device),
1541 &acpi_thermal_cooling_fops,
1542 acpi_driver_data(device));
1543 if (!entry)
1544 return -ENODEV;
1545
1546 /* 'polling_frequency' [R/W] */
1547 entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1548 S_IFREG | S_IRUGO | S_IWUSR,
1549 acpi_device_dir(device),
1550 &acpi_thermal_polling_fops,
1551 acpi_driver_data(device));
1552 if (!entry)
1553 return -ENODEV;
1554 return 0;
1555 }
1556
1557 static int acpi_thermal_remove_fs(struct acpi_device *device)
1558 {
1559
1560 if (acpi_device_dir(device)) {
1561 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1562 acpi_device_dir(device));
1563 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1564 acpi_device_dir(device));
1565 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1566 acpi_device_dir(device));
1567 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1568 acpi_device_dir(device));
1569 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1570 acpi_device_dir(device));
1571 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1572 acpi_device_dir(device) = NULL;
1573 }
1574
1575 return 0;
1576 }
1577
1578 /* --------------------------------------------------------------------------
1579 Driver Interface
1580 -------------------------------------------------------------------------- */
1581
1582 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1583 {
1584 struct acpi_thermal *tz = data;
1585 struct acpi_device *device = NULL;
1586
1587
1588 if (!tz)
1589 return;
1590
1591 device = tz->device;
1592
1593 switch (event) {
1594 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1595 acpi_thermal_check(tz);
1596 break;
1597 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1598 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1599 acpi_thermal_check(tz);
1600 acpi_bus_generate_proc_event(device, event, 0);
1601 acpi_bus_generate_netlink_event(device->pnp.device_class,
1602 dev_name(&device->dev), event, 0);
1603 break;
1604 case ACPI_THERMAL_NOTIFY_DEVICES:
1605 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1606 acpi_thermal_check(tz);
1607 acpi_bus_generate_proc_event(device, event, 0);
1608 acpi_bus_generate_netlink_event(device->pnp.device_class,
1609 dev_name(&device->dev), event, 0);
1610 break;
1611 default:
1612 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1613 "Unsupported event [0x%x]\n", event));
1614 break;
1615 }
1616
1617 return;
1618 }
1619
1620 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1621 {
1622 int result = 0;
1623
1624
1625 if (!tz)
1626 return -EINVAL;
1627
1628 /* Get temperature [_TMP] (required) */
1629 result = acpi_thermal_get_temperature(tz);
1630 if (result)
1631 return result;
1632
1633 /* Get trip points [_CRT, _PSV, etc.] (required) */
1634 result = acpi_thermal_get_trip_points(tz);
1635 if (result)
1636 return result;
1637
1638 /* Set the cooling mode [_SCP] to active cooling (default) */
1639 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1640 if (!result)
1641 tz->flags.cooling_mode = 1;
1642
1643 /* Get default polling frequency [_TZP] (optional) */
1644 if (tzp)
1645 tz->polling_frequency = tzp;
1646 else
1647 acpi_thermal_get_polling_frequency(tz);
1648
1649 return 0;
1650 }
1651
1652 static int acpi_thermal_add(struct acpi_device *device)
1653 {
1654 int result = 0;
1655 acpi_status status = AE_OK;
1656 struct acpi_thermal *tz = NULL;
1657
1658
1659 if (!device)
1660 return -EINVAL;
1661
1662 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1663 if (!tz)
1664 return -ENOMEM;
1665
1666 tz->device = device;
1667 strcpy(tz->name, device->pnp.bus_id);
1668 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1669 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1670 device->driver_data = tz;
1671 mutex_init(&tz->lock);
1672
1673
1674 result = acpi_thermal_get_info(tz);
1675 if (result)
1676 goto free_memory;
1677
1678 result = acpi_thermal_register_thermal_zone(tz);
1679 if (result)
1680 goto free_memory;
1681
1682 result = acpi_thermal_add_fs(device);
1683 if (result)
1684 goto unregister_thermal_zone;
1685
1686 init_timer(&tz->timer);
1687
1688 acpi_thermal_active_off(tz);
1689
1690 acpi_thermal_check(tz);
1691
1692 status = acpi_install_notify_handler(device->handle,
1693 ACPI_DEVICE_NOTIFY,
1694 acpi_thermal_notify, tz);
1695 if (ACPI_FAILURE(status)) {
1696 result = -ENODEV;
1697 goto remove_fs;
1698 }
1699
1700 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1701 acpi_device_name(device), acpi_device_bid(device),
1702 KELVIN_TO_CELSIUS(tz->temperature));
1703 goto end;
1704
1705 remove_fs:
1706 acpi_thermal_remove_fs(device);
1707 unregister_thermal_zone:
1708 thermal_zone_device_unregister(tz->thermal_zone);
1709 free_memory:
1710 kfree(tz);
1711 end:
1712 return result;
1713 }
1714
1715 static int acpi_thermal_remove(struct acpi_device *device, int type)
1716 {
1717 acpi_status status = AE_OK;
1718 struct acpi_thermal *tz = NULL;
1719
1720
1721 if (!device || !acpi_driver_data(device))
1722 return -EINVAL;
1723
1724 tz = acpi_driver_data(device);
1725
1726 /* avoid timer adding new defer task */
1727 tz->zombie = 1;
1728 /* wait for running timer (on other CPUs) finish */
1729 del_timer_sync(&(tz->timer));
1730 /* synchronize deferred task */
1731 acpi_os_wait_events_complete(NULL);
1732 /* deferred task may reinsert timer */
1733 del_timer_sync(&(tz->timer));
1734
1735 status = acpi_remove_notify_handler(device->handle,
1736 ACPI_DEVICE_NOTIFY,
1737 acpi_thermal_notify);
1738
1739 /* Terminate policy */
1740 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1741 tz->trips.passive.flags.enabled = 0;
1742 acpi_thermal_passive(tz);
1743 }
1744 if (tz->trips.active[0].flags.valid
1745 && tz->trips.active[0].flags.enabled) {
1746 tz->trips.active[0].flags.enabled = 0;
1747 acpi_thermal_active(tz);
1748 }
1749
1750 acpi_thermal_remove_fs(device);
1751 acpi_thermal_unregister_thermal_zone(tz);
1752 mutex_destroy(&tz->lock);
1753 kfree(tz);
1754 return 0;
1755 }
1756
1757 static int acpi_thermal_resume(struct acpi_device *device)
1758 {
1759 struct acpi_thermal *tz = NULL;
1760 int i, j, power_state, result;
1761
1762
1763 if (!device || !acpi_driver_data(device))
1764 return -EINVAL;
1765
1766 tz = acpi_driver_data(device);
1767
1768 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1769 if (!(&tz->trips.active[i]))
1770 break;
1771 if (!tz->trips.active[i].flags.valid)
1772 break;
1773 tz->trips.active[i].flags.enabled = 1;
1774 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1775 result = acpi_bus_get_power(tz->trips.active[i].devices.
1776 handles[j], &power_state);
1777 if (result || (power_state != ACPI_STATE_D0)) {
1778 tz->trips.active[i].flags.enabled = 0;
1779 break;
1780 }
1781 }
1782 tz->state.active |= tz->trips.active[i].flags.enabled;
1783 }
1784
1785 acpi_thermal_check(tz);
1786
1787 return AE_OK;
1788 }
1789
1790 static int thermal_act(const struct dmi_system_id *d) {
1791
1792 if (act == 0) {
1793 printk(KERN_NOTICE "ACPI: %s detected: "
1794 "disabling all active thermal trip points\n", d->ident);
1795 act = -1;
1796 }
1797 return 0;
1798 }
1799 static int thermal_nocrt(const struct dmi_system_id *d) {
1800
1801 printk(KERN_NOTICE "ACPI: %s detected: "
1802 "disabling all critical thermal trip point actions.\n", d->ident);
1803 nocrt = 1;
1804 return 0;
1805 }
1806 static int thermal_tzp(const struct dmi_system_id *d) {
1807
1808 if (tzp == 0) {
1809 printk(KERN_NOTICE "ACPI: %s detected: "
1810 "enabling thermal zone polling\n", d->ident);
1811 tzp = 300; /* 300 dS = 30 Seconds */
1812 }
1813 return 0;
1814 }
1815 static int thermal_psv(const struct dmi_system_id *d) {
1816
1817 if (psv == 0) {
1818 printk(KERN_NOTICE "ACPI: %s detected: "
1819 "disabling all passive thermal trip points\n", d->ident);
1820 psv = -1;
1821 }
1822 return 0;
1823 }
1824
1825 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1826 /*
1827 * Award BIOS on this AOpen makes thermal control almost worthless.
1828 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1829 */
1830 {
1831 .callback = thermal_act,
1832 .ident = "AOpen i915GMm-HFS",
1833 .matches = {
1834 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1835 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1836 },
1837 },
1838 {
1839 .callback = thermal_psv,
1840 .ident = "AOpen i915GMm-HFS",
1841 .matches = {
1842 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1843 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1844 },
1845 },
1846 {
1847 .callback = thermal_tzp,
1848 .ident = "AOpen i915GMm-HFS",
1849 .matches = {
1850 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1851 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1852 },
1853 },
1854 {
1855 .callback = thermal_nocrt,
1856 .ident = "Gigabyte GA-7ZX",
1857 .matches = {
1858 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1859 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1860 },
1861 },
1862 {}
1863 };
1864
1865 static int __init acpi_thermal_init(void)
1866 {
1867 int result = 0;
1868
1869 dmi_check_system(thermal_dmi_table);
1870
1871 if (off) {
1872 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1873 return -ENODEV;
1874 }
1875 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1876 if (!acpi_thermal_dir)
1877 return -ENODEV;
1878 acpi_thermal_dir->owner = THIS_MODULE;
1879
1880 result = acpi_bus_register_driver(&acpi_thermal_driver);
1881 if (result < 0) {
1882 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1883 return -ENODEV;
1884 }
1885
1886 return 0;
1887 }
1888
1889 static void __exit acpi_thermal_exit(void)
1890 {
1891
1892 acpi_bus_unregister_driver(&acpi_thermal_driver);
1893
1894 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1895
1896 return;
1897 }
1898
1899 module_init(acpi_thermal_init);
1900 module_exit(acpi_thermal_exit);
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