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[linux-2.6/mini2440.git] / drivers / acpi / thermal.c
blob073ff09218a9be62ac2acc25601080b4c87976e6
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) {
420 valid = tz->trips.passive.flags.valid;
421 if (psv == -1) {
422 status = AE_SUPPORT;
423 } else if (psv > 0) {
424 tmp = CELSIUS_TO_KELVIN(psv);
425 status = AE_OK;
426 } else {
427 status = acpi_evaluate_integer(tz->device->handle,
428 "_PSV", NULL, &tmp);
429 }
430
431 if (ACPI_FAILURE(status))
432 tz->trips.passive.flags.valid = 0;
433 else {
434 tz->trips.passive.temperature = tmp;
435 tz->trips.passive.flags.valid = 1;
436 if (flag == ACPI_TRIPS_INIT) {
437 status = acpi_evaluate_integer(
438 tz->device->handle, "_TC1",
439 NULL, &tmp);
440 if (ACPI_FAILURE(status))
441 tz->trips.passive.flags.valid = 0;
442 else
443 tz->trips.passive.tc1 = tmp;
444 status = acpi_evaluate_integer(
445 tz->device->handle, "_TC2",
446 NULL, &tmp);
447 if (ACPI_FAILURE(status))
448 tz->trips.passive.flags.valid = 0;
449 else
450 tz->trips.passive.tc2 = tmp;
451 status = acpi_evaluate_integer(
452 tz->device->handle, "_TSP",
453 NULL, &tmp);
454 if (ACPI_FAILURE(status))
455 tz->trips.passive.flags.valid = 0;
456 else
457 tz->trips.passive.tsp = tmp;
458 }
459 }
460 }
461 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
462 memset(&devices, 0, sizeof(struct acpi_handle_list));
463 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
464 NULL, &devices);
465 if (ACPI_FAILURE(status))
466 tz->trips.passive.flags.valid = 0;
467 else
468 tz->trips.passive.flags.valid = 1;
469
470 if (memcmp(&tz->trips.passive.devices, &devices,
471 sizeof(struct acpi_handle_list))) {
472 memcpy(&tz->trips.passive.devices, &devices,
473 sizeof(struct acpi_handle_list));
474 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
475 }
476 }
477 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
478 if (valid != tz->trips.passive.flags.valid)
479 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
480 }
481
482 /* Active (optional) */
483 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
484 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
485 valid = tz->trips.active[i].flags.valid;
486
487 if (act == -1)
488 break; /* disable all active trip points */
489
490 if (flag & ACPI_TRIPS_ACTIVE) {
491 status = acpi_evaluate_integer(tz->device->handle,
492 name, NULL, &tmp);
493 if (ACPI_FAILURE(status)) {
494 tz->trips.active[i].flags.valid = 0;
495 if (i == 0)
496 break;
497 if (act <= 0)
498 break;
499 if (i == 1)
500 tz->trips.active[0].temperature =
501 CELSIUS_TO_KELVIN(act);
502 else
503 /*
504 * Don't allow override higher than
505 * the next higher trip point
506 */
507 tz->trips.active[i - 1].temperature =
508 (tz->trips.active[i - 2].temperature <
509 CELSIUS_TO_KELVIN(act) ?
510 tz->trips.active[i - 2].temperature :
511 CELSIUS_TO_KELVIN(act));
512 break;
513 } else {
514 tz->trips.active[i].temperature = tmp;
515 tz->trips.active[i].flags.valid = 1;
516 }
517 }
518
519 name[2] = 'L';
520 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
521 memset(&devices, 0, sizeof(struct acpi_handle_list));
522 status = acpi_evaluate_reference(tz->device->handle,
523 name, NULL, &devices);
524 if (ACPI_FAILURE(status))
525 tz->trips.active[i].flags.valid = 0;
526 else
527 tz->trips.active[i].flags.valid = 1;
528
529 if (memcmp(&tz->trips.active[i].devices, &devices,
530 sizeof(struct acpi_handle_list))) {
531 memcpy(&tz->trips.active[i].devices, &devices,
532 sizeof(struct acpi_handle_list));
533 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
534 }
535 }
536 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
537 if (valid != tz->trips.active[i].flags.valid)
538 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
539
540 if (!tz->trips.active[i].flags.valid)
541 break;
542 }
543
544 if (flag & ACPI_TRIPS_DEVICES) {
545 memset(&devices, 0, sizeof(struct acpi_handle_list));
546 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
547 NULL, &devices);
548 if (memcmp(&tz->devices, &devices,
549 sizeof(struct acpi_handle_list))) {
550 memcpy(&tz->devices, &devices,
551 sizeof(struct acpi_handle_list));
552 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
553 }
554 }
555
556 return 0;
557 }
558
559 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
560 {
561 return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
562 }
563
564 static int acpi_thermal_critical(struct acpi_thermal *tz)
565 {
566 if (!tz || !tz->trips.critical.flags.valid)
567 return -EINVAL;
568
569 if (tz->temperature >= tz->trips.critical.temperature) {
570 printk(KERN_WARNING PREFIX "Critical trip point\n");
571 tz->trips.critical.flags.enabled = 1;
572 } else if (tz->trips.critical.flags.enabled)
573 tz->trips.critical.flags.enabled = 0;
574
575 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
576 tz->trips.critical.flags.enabled);
577 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
578 dev_name(&tz->device->dev),
579 ACPI_THERMAL_NOTIFY_CRITICAL,
580 tz->trips.critical.flags.enabled);
581
582 /* take no action if nocrt is set */
583 if(!nocrt) {
584 printk(KERN_EMERG
585 "Critical temperature reached (%ld C), shutting down.\n",
586 KELVIN_TO_CELSIUS(tz->temperature));
587 orderly_poweroff(true);
588 }
589
590 return 0;
591 }
592
593 static int acpi_thermal_hot(struct acpi_thermal *tz)
594 {
595 if (!tz || !tz->trips.hot.flags.valid)
596 return -EINVAL;
597
598 if (tz->temperature >= tz->trips.hot.temperature) {
599 printk(KERN_WARNING PREFIX "Hot trip point\n");
600 tz->trips.hot.flags.enabled = 1;
601 } else if (tz->trips.hot.flags.enabled)
602 tz->trips.hot.flags.enabled = 0;
603
604 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
605 tz->trips.hot.flags.enabled);
606 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
607 dev_name(&tz->device->dev),
608 ACPI_THERMAL_NOTIFY_HOT,
609 tz->trips.hot.flags.enabled);
610
611 /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
612
613 return 0;
614 }
615
616 static void acpi_thermal_passive(struct acpi_thermal *tz)
617 {
618 int result = 1;
619 struct acpi_thermal_passive *passive = NULL;
620 int trend = 0;
621 int i = 0;
622
623
624 if (!tz || !tz->trips.passive.flags.valid)
625 return;
626
627 passive = &(tz->trips.passive);
628
629 /*
630 * Above Trip?
631 * -----------
632 * Calculate the thermal trend (using the passive cooling equation)
633 * and modify the performance limit for all passive cooling devices
634 * accordingly. Note that we assume symmetry.
635 */
636 if (tz->temperature >= passive->temperature) {
637 trend =
638 (passive->tc1 * (tz->temperature - tz->last_temperature)) +
639 (passive->tc2 * (tz->temperature - passive->temperature));
640 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
641 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
642 trend, passive->tc1, tz->temperature,
643 tz->last_temperature, passive->tc2,
644 tz->temperature, passive->temperature));
645 passive->flags.enabled = 1;
646 /* Heating up? */
647 if (trend > 0)
648 for (i = 0; i < passive->devices.count; i++)
649 acpi_processor_set_thermal_limit(passive->
650 devices.
651 handles[i],
652 ACPI_PROCESSOR_LIMIT_INCREMENT);
653 /* Cooling off? */
654 else if (trend < 0) {
655 for (i = 0; i < passive->devices.count; i++)
656 /*
657 * assume that we are on highest
658 * freq/lowest thrott and can leave
659 * passive mode, even in error case
660 */
661 if (!acpi_processor_set_thermal_limit
662 (passive->devices.handles[i],
663 ACPI_PROCESSOR_LIMIT_DECREMENT))
664 result = 0;
665 /*
666 * Leave cooling mode, even if the temp might
667 * higher than trip point This is because some
668 * machines might have long thermal polling
669 * frequencies (tsp) defined. We will fall back
670 * into passive mode in next cycle (probably quicker)
671 */
672 if (result) {
673 passive->flags.enabled = 0;
674 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
675 "Disabling passive cooling, still above threshold,"
676 " but we are cooling down\n"));
677 }
678 }
679 return;
680 }
681
682 /*
683 * Below Trip?
684 * -----------
685 * Implement passive cooling hysteresis to slowly increase performance
686 * and avoid thrashing around the passive trip point. Note that we
687 * assume symmetry.
688 */
689 if (!passive->flags.enabled)
690 return;
691 for (i = 0; i < passive->devices.count; i++)
692 if (!acpi_processor_set_thermal_limit
693 (passive->devices.handles[i],
694 ACPI_PROCESSOR_LIMIT_DECREMENT))
695 result = 0;
696 if (result) {
697 passive->flags.enabled = 0;
698 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
699 "Disabling passive cooling (zone is cool)\n"));
700 }
701 }
702
703 static void acpi_thermal_active(struct acpi_thermal *tz)
704 {
705 int result = 0;
706 struct acpi_thermal_active *active = NULL;
707 int i = 0;
708 int j = 0;
709 unsigned long maxtemp = 0;
710
711
712 if (!tz)
713 return;
714
715 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
716 active = &(tz->trips.active[i]);
717 if (!active || !active->flags.valid)
718 break;
719 if (tz->temperature >= active->temperature) {
720 /*
721 * Above Threshold?
722 * ----------------
723 * If not already enabled, turn ON all cooling devices
724 * associated with this active threshold.
725 */
726 if (active->temperature > maxtemp)
727 tz->state.active_index = i;
728 maxtemp = active->temperature;
729 if (active->flags.enabled)
730 continue;
731 for (j = 0; j < active->devices.count; j++) {
732 result =
733 acpi_bus_set_power(active->devices.
734 handles[j],
735 ACPI_STATE_D0);
736 if (result) {
737 printk(KERN_WARNING PREFIX
738 "Unable to turn cooling device [%p] 'on'\n",
739 active->devices.
740 handles[j]);
741 continue;
742 }
743 active->flags.enabled = 1;
744 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
745 "Cooling device [%p] now 'on'\n",
746 active->devices.handles[j]));
747 }
748 continue;
749 }
750 if (!active->flags.enabled)
751 continue;
752 /*
753 * Below Threshold?
754 * ----------------
755 * Turn OFF all cooling devices associated with this
756 * threshold.
757 */
758 for (j = 0; j < active->devices.count; j++) {
759 result = acpi_bus_set_power(active->devices.handles[j],
760 ACPI_STATE_D3);
761 if (result) {
762 printk(KERN_WARNING PREFIX
763 "Unable to turn cooling device [%p] 'off'\n",
764 active->devices.handles[j]);
765 continue;
766 }
767 active->flags.enabled = 0;
768 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
769 "Cooling device [%p] now 'off'\n",
770 active->devices.handles[j]));
771 }
772 }
773 }
774
775 static void acpi_thermal_check(void *context);
776
777 static void acpi_thermal_run(unsigned long data)
778 {
779 struct acpi_thermal *tz = (struct acpi_thermal *)data;
780 if (!tz->zombie)
781 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
782 }
783
784 static void acpi_thermal_active_off(void *data)
785 {
786 int result = 0;
787 struct acpi_thermal *tz = data;
788 int i = 0;
789 int j = 0;
790 struct acpi_thermal_active *active = NULL;
791
792 if (!tz) {
793 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
794 return;
795 }
796
797 result = acpi_thermal_get_temperature(tz);
798 if (result)
799 return;
800
801 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
802 active = &(tz->trips.active[i]);
803 if (!active || !active->flags.valid)
804 break;
805 if (tz->temperature >= active->temperature) {
806 /*
807 * If the thermal temperature is greater than the
808 * active threshod, unnecessary to turn off the
809 * the active cooling device.
810 */
811 continue;
812 }
813 /*
814 * Below Threshold?
815 * ----------------
816 * Turn OFF all cooling devices associated with this
817 * threshold.
818 */
819 for (j = 0; j < active->devices.count; j++)
820 result = acpi_bus_set_power(active->devices.handles[j],
821 ACPI_STATE_D3);
822 }
823 }
824
825 static void acpi_thermal_check(void *data)
826 {
827 int result = 0;
828 struct acpi_thermal *tz = data;
829 unsigned long sleep_time = 0;
830 unsigned long timeout_jiffies = 0;
831 int i = 0;
832 struct acpi_thermal_state state;
833
834
835 if (!tz) {
836 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
837 return;
838 }
839
840 /* Check if someone else is already running */
841 if (!mutex_trylock(&tz->lock))
842 return;
843
844 state = tz->state;
845
846 result = acpi_thermal_get_temperature(tz);
847 if (result)
848 goto unlock;
849
850 if (!tz->tz_enabled)
851 goto unlock;
852
853 memset(&tz->state, 0, sizeof(tz->state));
854
855 /*
856 * Check Trip Points
857 * -----------------
858 * Compare the current temperature to the trip point values to see
859 * if we've entered one of the thermal policy states. Note that
860 * this function determines when a state is entered, but the
861 * individual policy decides when it is exited (e.g. hysteresis).
862 */
863 if (tz->trips.critical.flags.valid)
864 state.critical |=
865 (tz->temperature >= tz->trips.critical.temperature);
866 if (tz->trips.hot.flags.valid)
867 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
868 if (tz->trips.passive.flags.valid)
869 state.passive |=
870 (tz->temperature >= tz->trips.passive.temperature);
871 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
872 if (tz->trips.active[i].flags.valid)
873 state.active |=
874 (tz->temperature >=
875 tz->trips.active[i].temperature);
876
877 /*
878 * Invoke Policy
879 * -------------
880 * Separated from the above check to allow individual policy to
881 * determine when to exit a given state.
882 */
883 if (state.critical)
884 acpi_thermal_critical(tz);
885 if (state.hot)
886 acpi_thermal_hot(tz);
887 if (state.passive)
888 acpi_thermal_passive(tz);
889 if (state.active)
890 acpi_thermal_active(tz);
891
892 /*
893 * Calculate State
894 * ---------------
895 * Again, separated from the above two to allow independent policy
896 * decisions.
897 */
898 tz->state.critical = tz->trips.critical.flags.enabled;
899 tz->state.hot = tz->trips.hot.flags.enabled;
900 tz->state.passive = tz->trips.passive.flags.enabled;
901 tz->state.active = 0;
902 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
903 tz->state.active |= tz->trips.active[i].flags.enabled;
904
905 /*
906 * Calculate Sleep Time
907 * --------------------
908 * If we're in the passive state, use _TSP's value. Otherwise
909 * use the default polling frequency (e.g. _TZP). If no polling
910 * frequency is specified then we'll wait forever (at least until
911 * a thermal event occurs). Note that _TSP and _TZD values are
912 * given in 1/10th seconds (we must covert to milliseconds).
913 */
914 if (tz->state.passive) {
915 sleep_time = tz->trips.passive.tsp * 100;
916 timeout_jiffies = jiffies + (HZ * sleep_time) / 1000;
917 } else if (tz->polling_frequency > 0) {
918 sleep_time = tz->polling_frequency * 100;
919 timeout_jiffies = round_jiffies(jiffies + (HZ * sleep_time) / 1000);
920 }
921
922 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
923 tz->name, tz->temperature, sleep_time));
924
925 /*
926 * Schedule Next Poll
927 * ------------------
928 */
929 if (!sleep_time) {
930 if (timer_pending(&(tz->timer)))
931 del_timer(&(tz->timer));
932 } else {
933 if (timer_pending(&(tz->timer)))
934 mod_timer(&(tz->timer), timeout_jiffies);
935 else {
936 tz->timer.data = (unsigned long)tz;
937 tz->timer.function = acpi_thermal_run;
938 tz->timer.expires = timeout_jiffies;
939 add_timer(&(tz->timer));
940 }
941 }
942 unlock:
943 mutex_unlock(&tz->lock);
944 }
945
946 /* sys I/F for generic thermal sysfs support */
947 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
948
949 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
950 {
951 struct acpi_thermal *tz = thermal->devdata;
952 int result;
953
954 if (!tz)
955 return -EINVAL;
956
957 result = acpi_thermal_get_temperature(tz);
958 if (result)
959 return result;
960
961 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature));
962 }
963
964 static const char enabled[] = "kernel";
965 static const char disabled[] = "user";
966 static int thermal_get_mode(struct thermal_zone_device *thermal,
967 char *buf)
968 {
969 struct acpi_thermal *tz = thermal->devdata;
970
971 if (!tz)
972 return -EINVAL;
973
974 return sprintf(buf, "%s\n", tz->tz_enabled ?
975 enabled : disabled);
976 }
977
978 static int thermal_set_mode(struct thermal_zone_device *thermal,
979 const char *buf)
980 {
981 struct acpi_thermal *tz = thermal->devdata;
982 int enable;
983
984 if (!tz)
985 return -EINVAL;
986
987 /*
988 * enable/disable thermal management from ACPI thermal driver
989 */
990 if (!strncmp(buf, enabled, sizeof enabled - 1))
991 enable = 1;
992 else if (!strncmp(buf, disabled, sizeof disabled - 1))
993 enable = 0;
994 else
995 return -EINVAL;
996
997 if (enable != tz->tz_enabled) {
998 tz->tz_enabled = enable;
999 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1000 "%s ACPI thermal control\n",
1001 tz->tz_enabled ? enabled : disabled));
1002 acpi_thermal_check(tz);
1003 }
1004 return 0;
1005 }
1006
1007 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
1008 int trip, char *buf)
1009 {
1010 struct acpi_thermal *tz = thermal->devdata;
1011 int i;
1012
1013 if (!tz || trip < 0)
1014 return -EINVAL;
1015
1016 if (tz->trips.critical.flags.valid) {
1017 if (!trip)
1018 return sprintf(buf, "critical\n");
1019 trip--;
1020 }
1021
1022 if (tz->trips.hot.flags.valid) {
1023 if (!trip)
1024 return sprintf(buf, "hot\n");
1025 trip--;
1026 }
1027
1028 if (tz->trips.passive.flags.valid) {
1029 if (!trip)
1030 return sprintf(buf, "passive\n");
1031 trip--;
1032 }
1033
1034 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1035 tz->trips.active[i].flags.valid; i++) {
1036 if (!trip)
1037 return sprintf(buf, "active%d\n", i);
1038 trip--;
1039 }
1040
1041 return -EINVAL;
1042 }
1043
1044 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
1045 int trip, char *buf)
1046 {
1047 struct acpi_thermal *tz = thermal->devdata;
1048 int i;
1049
1050 if (!tz || trip < 0)
1051 return -EINVAL;
1052
1053 if (tz->trips.critical.flags.valid) {
1054 if (!trip)
1055 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1056 tz->trips.critical.temperature));
1057 trip--;
1058 }
1059
1060 if (tz->trips.hot.flags.valid) {
1061 if (!trip)
1062 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1063 tz->trips.hot.temperature));
1064 trip--;
1065 }
1066
1067 if (tz->trips.passive.flags.valid) {
1068 if (!trip)
1069 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1070 tz->trips.passive.temperature));
1071 trip--;
1072 }
1073
1074 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1075 tz->trips.active[i].flags.valid; i++) {
1076 if (!trip)
1077 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1078 tz->trips.active[i].temperature));
1079 trip--;
1080 }
1081
1082 return -EINVAL;
1083 }
1084
1085 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
1086 unsigned long *temperature) {
1087 struct acpi_thermal *tz = thermal->devdata;
1088
1089 if (tz->trips.critical.flags.valid) {
1090 *temperature = KELVIN_TO_MILLICELSIUS(
1091 tz->trips.critical.temperature);
1092 return 0;
1093 } else
1094 return -EINVAL;
1095 }
1096
1097 typedef int (*cb)(struct thermal_zone_device *, int,
1098 struct thermal_cooling_device *);
1099 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
1100 struct thermal_cooling_device *cdev,
1101 cb action)
1102 {
1103 struct acpi_device *device = cdev->devdata;
1104 struct acpi_thermal *tz = thermal->devdata;
1105 struct acpi_device *dev;
1106 acpi_status status;
1107 acpi_handle handle;
1108 int i;
1109 int j;
1110 int trip = -1;
1111 int result = 0;
1112
1113 if (tz->trips.critical.flags.valid)
1114 trip++;
1115
1116 if (tz->trips.hot.flags.valid)
1117 trip++;
1118
1119 if (tz->trips.passive.flags.valid) {
1120 trip++;
1121 for (i = 0; i < tz->trips.passive.devices.count;
1122 i++) {
1123 handle = tz->trips.passive.devices.handles[i];
1124 status = acpi_bus_get_device(handle, &dev);
1125 if (ACPI_SUCCESS(status) && (dev == device)) {
1126 result = action(thermal, trip, cdev);
1127 if (result)
1128 goto failed;
1129 }
1130 }
1131 }
1132
1133 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1134 if (!tz->trips.active[i].flags.valid)
1135 break;
1136 trip++;
1137 for (j = 0;
1138 j < tz->trips.active[i].devices.count;
1139 j++) {
1140 handle = tz->trips.active[i].devices.handles[j];
1141 status = acpi_bus_get_device(handle, &dev);
1142 if (ACPI_SUCCESS(status) && (dev == device)) {
1143 result = action(thermal, trip, cdev);
1144 if (result)
1145 goto failed;
1146 }
1147 }
1148 }
1149
1150 for (i = 0; i < tz->devices.count; i++) {
1151 handle = tz->devices.handles[i];
1152 status = acpi_bus_get_device(handle, &dev);
1153 if (ACPI_SUCCESS(status) && (dev == device)) {
1154 result = action(thermal, -1, cdev);
1155 if (result)
1156 goto failed;
1157 }
1158 }
1159
1160 failed:
1161 return result;
1162 }
1163
1164 static int
1165 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1166 struct thermal_cooling_device *cdev)
1167 {
1168 return acpi_thermal_cooling_device_cb(thermal, cdev,
1169 thermal_zone_bind_cooling_device);
1170 }
1171
1172 static int
1173 acpi_thermal_unbind_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_unbind_cooling_device);
1178 }
1179
1180 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1181 .bind = acpi_thermal_bind_cooling_device,
1182 .unbind = acpi_thermal_unbind_cooling_device,
1183 .get_temp = thermal_get_temp,
1184 .get_mode = thermal_get_mode,
1185 .set_mode = thermal_set_mode,
1186 .get_trip_type = thermal_get_trip_type,
1187 .get_trip_temp = thermal_get_trip_temp,
1188 .get_crit_temp = thermal_get_crit_temp,
1189 };
1190
1191 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1192 {
1193 int trips = 0;
1194 int result;
1195 acpi_status status;
1196 int i;
1197
1198 if (tz->trips.critical.flags.valid)
1199 trips++;
1200
1201 if (tz->trips.hot.flags.valid)
1202 trips++;
1203
1204 if (tz->trips.passive.flags.valid)
1205 trips++;
1206
1207 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1208 tz->trips.active[i].flags.valid; i++, trips++);
1209 tz->thermal_zone = thermal_zone_device_register("acpitz",
1210 trips, tz, &acpi_thermal_zone_ops);
1211 if (IS_ERR(tz->thermal_zone))
1212 return -ENODEV;
1213
1214 result = sysfs_create_link(&tz->device->dev.kobj,
1215 &tz->thermal_zone->device.kobj, "thermal_zone");
1216 if (result)
1217 return result;
1218
1219 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1220 &tz->device->dev.kobj, "device");
1221 if (result)
1222 return result;
1223
1224 status = acpi_attach_data(tz->device->handle,
1225 acpi_bus_private_data_handler,
1226 tz->thermal_zone);
1227 if (ACPI_FAILURE(status)) {
1228 printk(KERN_ERR PREFIX
1229 "Error attaching device data\n");
1230 return -ENODEV;
1231 }
1232
1233 tz->tz_enabled = 1;
1234
1235 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
1236 tz->thermal_zone->id);
1237 return 0;
1238 }
1239
1240 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1241 {
1242 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1243 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1244 thermal_zone_device_unregister(tz->thermal_zone);
1245 tz->thermal_zone = NULL;
1246 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
1247 }
1248
1249
1250 /* --------------------------------------------------------------------------
1251 FS Interface (/proc)
1252 -------------------------------------------------------------------------- */
1253
1254 static struct proc_dir_entry *acpi_thermal_dir;
1255
1256 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1257 {
1258 struct acpi_thermal *tz = seq->private;
1259
1260
1261 if (!tz)
1262 goto end;
1263
1264 seq_puts(seq, "state: ");
1265
1266 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1267 && !tz->state.active)
1268 seq_puts(seq, "ok\n");
1269 else {
1270 if (tz->state.critical)
1271 seq_puts(seq, "critical ");
1272 if (tz->state.hot)
1273 seq_puts(seq, "hot ");
1274 if (tz->state.passive)
1275 seq_puts(seq, "passive ");
1276 if (tz->state.active)
1277 seq_printf(seq, "active[%d]", tz->state.active_index);
1278 seq_puts(seq, "\n");
1279 }
1280
1281 end:
1282 return 0;
1283 }
1284
1285 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1286 {
1287 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1288 }
1289
1290 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1291 {
1292 int result = 0;
1293 struct acpi_thermal *tz = seq->private;
1294
1295
1296 if (!tz)
1297 goto end;
1298
1299 result = acpi_thermal_get_temperature(tz);
1300 if (result)
1301 goto end;
1302
1303 seq_printf(seq, "temperature: %ld C\n",
1304 KELVIN_TO_CELSIUS(tz->temperature));
1305
1306 end:
1307 return 0;
1308 }
1309
1310 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1311 {
1312 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1313 }
1314
1315 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1316 {
1317 struct acpi_thermal *tz = seq->private;
1318 struct acpi_device *device;
1319 acpi_status status;
1320
1321 int i = 0;
1322 int j = 0;
1323
1324
1325 if (!tz)
1326 goto end;
1327
1328 if (tz->trips.critical.flags.valid)
1329 seq_printf(seq, "critical (S5): %ld C%s",
1330 KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1331 nocrt ? " <disabled>\n" : "\n");
1332
1333 if (tz->trips.hot.flags.valid)
1334 seq_printf(seq, "hot (S4): %ld C%s",
1335 KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1336 nocrt ? " <disabled>\n" : "\n");
1337
1338 if (tz->trips.passive.flags.valid) {
1339 seq_printf(seq,
1340 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1341 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1342 tz->trips.passive.tc1, tz->trips.passive.tc2,
1343 tz->trips.passive.tsp);
1344 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1345 status = acpi_bus_get_device(tz->trips.passive.devices.
1346 handles[j], &device);
1347 seq_printf(seq, "%4.4s ", status ? "" :
1348 acpi_device_bid(device));
1349 }
1350 seq_puts(seq, "\n");
1351 }
1352
1353 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1354 if (!(tz->trips.active[i].flags.valid))
1355 break;
1356 seq_printf(seq, "active[%d]: %ld C: devices=",
1357 i,
1358 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1359 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1360 status = acpi_bus_get_device(tz->trips.active[i].
1361 devices.handles[j],
1362 &device);
1363 seq_printf(seq, "%4.4s ", status ? "" :
1364 acpi_device_bid(device));
1365 }
1366 seq_puts(seq, "\n");
1367 }
1368
1369 end:
1370 return 0;
1371 }
1372
1373 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1374 {
1375 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1376 }
1377
1378 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1379 {
1380 struct acpi_thermal *tz = seq->private;
1381
1382
1383 if (!tz)
1384 goto end;
1385
1386 if (!tz->flags.cooling_mode)
1387 seq_puts(seq, "<setting not supported>\n");
1388 else
1389 seq_puts(seq, "0 - Active; 1 - Passive\n");
1390
1391 end:
1392 return 0;
1393 }
1394
1395 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1396 {
1397 return single_open(file, acpi_thermal_cooling_seq_show,
1398 PDE(inode)->data);
1399 }
1400
1401 static ssize_t
1402 acpi_thermal_write_cooling_mode(struct file *file,
1403 const char __user * buffer,
1404 size_t count, loff_t * ppos)
1405 {
1406 struct seq_file *m = file->private_data;
1407 struct acpi_thermal *tz = m->private;
1408 int result = 0;
1409 char mode_string[12] = { '\0' };
1410
1411
1412 if (!tz || (count > sizeof(mode_string) - 1))
1413 return -EINVAL;
1414
1415 if (!tz->flags.cooling_mode)
1416 return -ENODEV;
1417
1418 if (copy_from_user(mode_string, buffer, count))
1419 return -EFAULT;
1420
1421 mode_string[count] = '\0';
1422
1423 result = acpi_thermal_set_cooling_mode(tz,
1424 simple_strtoul(mode_string, NULL,
1425 0));
1426 if (result)
1427 return result;
1428
1429 acpi_thermal_check(tz);
1430
1431 return count;
1432 }
1433
1434 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1435 {
1436 struct acpi_thermal *tz = seq->private;
1437
1438
1439 if (!tz)
1440 goto end;
1441
1442 if (!tz->polling_frequency) {
1443 seq_puts(seq, "<polling disabled>\n");
1444 goto end;
1445 }
1446
1447 seq_printf(seq, "polling frequency: %lu seconds\n",
1448 (tz->polling_frequency / 10));
1449
1450 end:
1451 return 0;
1452 }
1453
1454 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1455 {
1456 return single_open(file, acpi_thermal_polling_seq_show,
1457 PDE(inode)->data);
1458 }
1459
1460 static ssize_t
1461 acpi_thermal_write_polling(struct file *file,
1462 const char __user * buffer,
1463 size_t count, loff_t * ppos)
1464 {
1465 struct seq_file *m = file->private_data;
1466 struct acpi_thermal *tz = m->private;
1467 int result = 0;
1468 char polling_string[12] = { '\0' };
1469 int seconds = 0;
1470
1471
1472 if (!tz || (count > sizeof(polling_string) - 1))
1473 return -EINVAL;
1474
1475 if (copy_from_user(polling_string, buffer, count))
1476 return -EFAULT;
1477
1478 polling_string[count] = '\0';
1479
1480 seconds = simple_strtoul(polling_string, NULL, 0);
1481
1482 result = acpi_thermal_set_polling(tz, seconds);
1483 if (result)
1484 return result;
1485
1486 acpi_thermal_check(tz);
1487
1488 return count;
1489 }
1490
1491 static int acpi_thermal_add_fs(struct acpi_device *device)
1492 {
1493 struct proc_dir_entry *entry = NULL;
1494
1495
1496 if (!acpi_device_dir(device)) {
1497 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1498 acpi_thermal_dir);
1499 if (!acpi_device_dir(device))
1500 return -ENODEV;
1501 acpi_device_dir(device)->owner = THIS_MODULE;
1502 }
1503
1504 /* 'state' [R] */
1505 entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1506 S_IRUGO, acpi_device_dir(device),
1507 &acpi_thermal_state_fops,
1508 acpi_driver_data(device));
1509 if (!entry)
1510 return -ENODEV;
1511
1512 /* 'temperature' [R] */
1513 entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1514 S_IRUGO, acpi_device_dir(device),
1515 &acpi_thermal_temp_fops,
1516 acpi_driver_data(device));
1517 if (!entry)
1518 return -ENODEV;
1519
1520 /* 'trip_points' [R] */
1521 entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1522 S_IRUGO,
1523 acpi_device_dir(device),
1524 &acpi_thermal_trip_fops,
1525 acpi_driver_data(device));
1526 if (!entry)
1527 return -ENODEV;
1528
1529 /* 'cooling_mode' [R/W] */
1530 entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1531 S_IFREG | S_IRUGO | S_IWUSR,
1532 acpi_device_dir(device),
1533 &acpi_thermal_cooling_fops,
1534 acpi_driver_data(device));
1535 if (!entry)
1536 return -ENODEV;
1537
1538 /* 'polling_frequency' [R/W] */
1539 entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1540 S_IFREG | S_IRUGO | S_IWUSR,
1541 acpi_device_dir(device),
1542 &acpi_thermal_polling_fops,
1543 acpi_driver_data(device));
1544 if (!entry)
1545 return -ENODEV;
1546 return 0;
1547 }
1548
1549 static int acpi_thermal_remove_fs(struct acpi_device *device)
1550 {
1551
1552 if (acpi_device_dir(device)) {
1553 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1554 acpi_device_dir(device));
1555 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1556 acpi_device_dir(device));
1557 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1558 acpi_device_dir(device));
1559 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1560 acpi_device_dir(device));
1561 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1562 acpi_device_dir(device));
1563 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1564 acpi_device_dir(device) = NULL;
1565 }
1566
1567 return 0;
1568 }
1569
1570 /* --------------------------------------------------------------------------
1571 Driver Interface
1572 -------------------------------------------------------------------------- */
1573
1574 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1575 {
1576 struct acpi_thermal *tz = data;
1577 struct acpi_device *device = NULL;
1578
1579
1580 if (!tz)
1581 return;
1582
1583 device = tz->device;
1584
1585 switch (event) {
1586 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1587 acpi_thermal_check(tz);
1588 break;
1589 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1590 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1591 acpi_thermal_check(tz);
1592 acpi_bus_generate_proc_event(device, event, 0);
1593 acpi_bus_generate_netlink_event(device->pnp.device_class,
1594 dev_name(&device->dev), event, 0);
1595 break;
1596 case ACPI_THERMAL_NOTIFY_DEVICES:
1597 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1598 acpi_thermal_check(tz);
1599 acpi_bus_generate_proc_event(device, event, 0);
1600 acpi_bus_generate_netlink_event(device->pnp.device_class,
1601 dev_name(&device->dev), event, 0);
1602 break;
1603 default:
1604 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1605 "Unsupported event [0x%x]\n", event));
1606 break;
1607 }
1608
1609 return;
1610 }
1611
1612 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1613 {
1614 int result = 0;
1615
1616
1617 if (!tz)
1618 return -EINVAL;
1619
1620 /* Get temperature [_TMP] (required) */
1621 result = acpi_thermal_get_temperature(tz);
1622 if (result)
1623 return result;
1624
1625 /* Get trip points [_CRT, _PSV, etc.] (required) */
1626 result = acpi_thermal_get_trip_points(tz);
1627 if (result)
1628 return result;
1629
1630 /* Set the cooling mode [_SCP] to active cooling (default) */
1631 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1632 if (!result)
1633 tz->flags.cooling_mode = 1;
1634
1635 /* Get default polling frequency [_TZP] (optional) */
1636 if (tzp)
1637 tz->polling_frequency = tzp;
1638 else
1639 acpi_thermal_get_polling_frequency(tz);
1640
1641 return 0;
1642 }
1643
1644 static int acpi_thermal_add(struct acpi_device *device)
1645 {
1646 int result = 0;
1647 acpi_status status = AE_OK;
1648 struct acpi_thermal *tz = NULL;
1649
1650
1651 if (!device)
1652 return -EINVAL;
1653
1654 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1655 if (!tz)
1656 return -ENOMEM;
1657
1658 tz->device = device;
1659 strcpy(tz->name, device->pnp.bus_id);
1660 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1661 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1662 device->driver_data = tz;
1663 mutex_init(&tz->lock);
1664
1665
1666 result = acpi_thermal_get_info(tz);
1667 if (result)
1668 goto free_memory;
1669
1670 result = acpi_thermal_register_thermal_zone(tz);
1671 if (result)
1672 goto free_memory;
1673
1674 result = acpi_thermal_add_fs(device);
1675 if (result)
1676 goto unregister_thermal_zone;
1677
1678 init_timer(&tz->timer);
1679
1680 acpi_thermal_active_off(tz);
1681
1682 acpi_thermal_check(tz);
1683
1684 status = acpi_install_notify_handler(device->handle,
1685 ACPI_DEVICE_NOTIFY,
1686 acpi_thermal_notify, tz);
1687 if (ACPI_FAILURE(status)) {
1688 result = -ENODEV;
1689 goto remove_fs;
1690 }
1691
1692 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1693 acpi_device_name(device), acpi_device_bid(device),
1694 KELVIN_TO_CELSIUS(tz->temperature));
1695 goto end;
1696
1697 remove_fs:
1698 acpi_thermal_remove_fs(device);
1699 unregister_thermal_zone:
1700 thermal_zone_device_unregister(tz->thermal_zone);
1701 free_memory:
1702 kfree(tz);
1703 end:
1704 return result;
1705 }
1706
1707 static int acpi_thermal_remove(struct acpi_device *device, int type)
1708 {
1709 acpi_status status = AE_OK;
1710 struct acpi_thermal *tz = NULL;
1711
1712
1713 if (!device || !acpi_driver_data(device))
1714 return -EINVAL;
1715
1716 tz = acpi_driver_data(device);
1717
1718 /* avoid timer adding new defer task */
1719 tz->zombie = 1;
1720 /* wait for running timer (on other CPUs) finish */
1721 del_timer_sync(&(tz->timer));
1722 /* synchronize deferred task */
1723 acpi_os_wait_events_complete(NULL);
1724 /* deferred task may reinsert timer */
1725 del_timer_sync(&(tz->timer));
1726
1727 status = acpi_remove_notify_handler(device->handle,
1728 ACPI_DEVICE_NOTIFY,
1729 acpi_thermal_notify);
1730
1731 /* Terminate policy */
1732 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1733 tz->trips.passive.flags.enabled = 0;
1734 acpi_thermal_passive(tz);
1735 }
1736 if (tz->trips.active[0].flags.valid
1737 && tz->trips.active[0].flags.enabled) {
1738 tz->trips.active[0].flags.enabled = 0;
1739 acpi_thermal_active(tz);
1740 }
1741
1742 acpi_thermal_remove_fs(device);
1743 acpi_thermal_unregister_thermal_zone(tz);
1744 mutex_destroy(&tz->lock);
1745 kfree(tz);
1746 return 0;
1747 }
1748
1749 static int acpi_thermal_resume(struct acpi_device *device)
1750 {
1751 struct acpi_thermal *tz = NULL;
1752 int i, j, power_state, result;
1753
1754
1755 if (!device || !acpi_driver_data(device))
1756 return -EINVAL;
1757
1758 tz = acpi_driver_data(device);
1759
1760 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1761 if (!(&tz->trips.active[i]))
1762 break;
1763 if (!tz->trips.active[i].flags.valid)
1764 break;
1765 tz->trips.active[i].flags.enabled = 1;
1766 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1767 result = acpi_bus_get_power(tz->trips.active[i].devices.
1768 handles[j], &power_state);
1769 if (result || (power_state != ACPI_STATE_D0)) {
1770 tz->trips.active[i].flags.enabled = 0;
1771 break;
1772 }
1773 }
1774 tz->state.active |= tz->trips.active[i].flags.enabled;
1775 }
1776
1777 acpi_thermal_check(tz);
1778
1779 return AE_OK;
1780 }
1781
1782 static int thermal_act(const struct dmi_system_id *d) {
1783
1784 if (act == 0) {
1785 printk(KERN_NOTICE "ACPI: %s detected: "
1786 "disabling all active thermal trip points\n", d->ident);
1787 act = -1;
1788 }
1789 return 0;
1790 }
1791 static int thermal_nocrt(const struct dmi_system_id *d) {
1792
1793 printk(KERN_NOTICE "ACPI: %s detected: "
1794 "disabling all critical thermal trip point actions.\n", d->ident);
1795 nocrt = 1;
1796 return 0;
1797 }
1798 static int thermal_tzp(const struct dmi_system_id *d) {
1799
1800 if (tzp == 0) {
1801 printk(KERN_NOTICE "ACPI: %s detected: "
1802 "enabling thermal zone polling\n", d->ident);
1803 tzp = 300; /* 300 dS = 30 Seconds */
1804 }
1805 return 0;
1806 }
1807 static int thermal_psv(const struct dmi_system_id *d) {
1808
1809 if (psv == 0) {
1810 printk(KERN_NOTICE "ACPI: %s detected: "
1811 "disabling all passive thermal trip points\n", d->ident);
1812 psv = -1;
1813 }
1814 return 0;
1815 }
1816
1817 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1818 /*
1819 * Award BIOS on this AOpen makes thermal control almost worthless.
1820 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1821 */
1822 {
1823 .callback = thermal_act,
1824 .ident = "AOpen i915GMm-HFS",
1825 .matches = {
1826 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1827 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1828 },
1829 },
1830 {
1831 .callback = thermal_psv,
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_tzp,
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_nocrt,
1848 .ident = "Gigabyte GA-7ZX",
1849 .matches = {
1850 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1851 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1852 },
1853 },
1854 {}
1855 };
1856
1857 static int __init acpi_thermal_init(void)
1858 {
1859 int result = 0;
1860
1861 dmi_check_system(thermal_dmi_table);
1862
1863 if (off) {
1864 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1865 return -ENODEV;
1866 }
1867 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1868 if (!acpi_thermal_dir)
1869 return -ENODEV;
1870 acpi_thermal_dir->owner = THIS_MODULE;
1871
1872 result = acpi_bus_register_driver(&acpi_thermal_driver);
1873 if (result < 0) {
1874 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1875 return -ENODEV;
1876 }
1877
1878 return 0;
1879 }
1880
1881 static void __exit acpi_thermal_exit(void)
1882 {
1883
1884 acpi_bus_unregister_driver(&acpi_thermal_driver);
1885
1886 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1887
1888 return;
1889 }
1890
1891 module_init(acpi_thermal_init);
1892 module_exit(acpi_thermal_exit);
Support for the Chinese Samsung S3C2440 based development boards