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Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[wrt350n-kernel.git] / drivers / acpi / thermal.c
blobb2855f681e5e08488a1e8e8ba086a59882409c7c
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_COMPONENT 0x04000000
51 #define ACPI_THERMAL_CLASS "thermal_zone"
52 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
53 #define ACPI_THERMAL_FILE_STATE "state"
54 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
55 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
56 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
57 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
58 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
59 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
60 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82
61 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
62 #define ACPI_THERMAL_NOTIFY_HOT 0xF1
63 #define ACPI_THERMAL_MODE_ACTIVE 0x00
64
65 #define ACPI_THERMAL_MAX_ACTIVE 10
66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
67
68 #define _COMPONENT ACPI_THERMAL_COMPONENT
69 ACPI_MODULE_NAME("thermal");
70
71 MODULE_AUTHOR("Paul Diefenbaugh");
72 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
73 MODULE_LICENSE("GPL");
74
75 static int act;
76 module_param(act, int, 0644);
77 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
78
79 static int crt;
80 module_param(crt, int, 0644);
81 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
82
83 static int tzp;
84 module_param(tzp, int, 0444);
85 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
86
87 static int nocrt;
88 module_param(nocrt, int, 0);
89 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
90
91 static int off;
92 module_param(off, int, 0);
93 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
94
95 static int psv;
96 module_param(psv, int, 0644);
97 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
98
99 static int acpi_thermal_add(struct acpi_device *device);
100 static int acpi_thermal_remove(struct acpi_device *device, int type);
101 static int acpi_thermal_resume(struct acpi_device *device);
102 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
103 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
104 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
105 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
106 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
107 const char __user *, size_t,
108 loff_t *);
109 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
110 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
111 size_t, loff_t *);
112
113 static const struct acpi_device_id thermal_device_ids[] = {
114 {ACPI_THERMAL_HID, 0},
115 {"", 0},
116 };
117 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
118
119 static struct acpi_driver acpi_thermal_driver = {
120 .name = "thermal",
121 .class = ACPI_THERMAL_CLASS,
122 .ids = thermal_device_ids,
123 .ops = {
124 .add = acpi_thermal_add,
125 .remove = acpi_thermal_remove,
126 .resume = acpi_thermal_resume,
127 },
128 };
129
130 struct acpi_thermal_state {
131 u8 critical:1;
132 u8 hot:1;
133 u8 passive:1;
134 u8 active:1;
135 u8 reserved:4;
136 int active_index;
137 };
138
139 struct acpi_thermal_state_flags {
140 u8 valid:1;
141 u8 enabled:1;
142 u8 reserved:6;
143 };
144
145 struct acpi_thermal_critical {
146 struct acpi_thermal_state_flags flags;
147 unsigned long temperature;
148 };
149
150 struct acpi_thermal_hot {
151 struct acpi_thermal_state_flags flags;
152 unsigned long temperature;
153 };
154
155 struct acpi_thermal_passive {
156 struct acpi_thermal_state_flags flags;
157 unsigned long temperature;
158 unsigned long tc1;
159 unsigned long tc2;
160 unsigned long tsp;
161 struct acpi_handle_list devices;
162 };
163
164 struct acpi_thermal_active {
165 struct acpi_thermal_state_flags flags;
166 unsigned long temperature;
167 struct acpi_handle_list devices;
168 };
169
170 struct acpi_thermal_trips {
171 struct acpi_thermal_critical critical;
172 struct acpi_thermal_hot hot;
173 struct acpi_thermal_passive passive;
174 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
175 };
176
177 struct acpi_thermal_flags {
178 u8 cooling_mode:1; /* _SCP */
179 u8 devices:1; /* _TZD */
180 u8 reserved:6;
181 };
182
183 struct acpi_thermal {
184 struct acpi_device * device;
185 acpi_bus_id name;
186 unsigned long temperature;
187 unsigned long last_temperature;
188 unsigned long polling_frequency;
189 volatile u8 zombie;
190 struct acpi_thermal_flags flags;
191 struct acpi_thermal_state state;
192 struct acpi_thermal_trips trips;
193 struct acpi_handle_list devices;
194 struct timer_list timer;
195 struct thermal_zone_device *thermal_zone;
196 int tz_enabled;
197 struct mutex lock;
198 };
199
200 static const struct file_operations acpi_thermal_state_fops = {
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 .open = acpi_thermal_temp_open_fs,
209 .read = seq_read,
210 .llseek = seq_lseek,
211 .release = single_release,
212 };
213
214 static const struct file_operations acpi_thermal_trip_fops = {
215 .open = acpi_thermal_trip_open_fs,
216 .read = seq_read,
217 .llseek = seq_lseek,
218 .release = single_release,
219 };
220
221 static const struct file_operations acpi_thermal_cooling_fops = {
222 .open = acpi_thermal_cooling_open_fs,
223 .read = seq_read,
224 .write = acpi_thermal_write_cooling_mode,
225 .llseek = seq_lseek,
226 .release = single_release,
227 };
228
229 static const struct file_operations acpi_thermal_polling_fops = {
230 .open = acpi_thermal_polling_open_fs,
231 .read = seq_read,
232 .write = acpi_thermal_write_polling,
233 .llseek = seq_lseek,
234 .release = single_release,
235 };
236
237 /* --------------------------------------------------------------------------
238 Thermal Zone Management
239 -------------------------------------------------------------------------- */
240
241 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
242 {
243 acpi_status status = AE_OK;
244
245
246 if (!tz)
247 return -EINVAL;
248
249 tz->last_temperature = tz->temperature;
250
251 status =
252 acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
253 if (ACPI_FAILURE(status))
254 return -ENODEV;
255
256 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
257 tz->temperature));
258
259 return 0;
260 }
261
262 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
263 {
264 acpi_status status = AE_OK;
265
266
267 if (!tz)
268 return -EINVAL;
269
270 status =
271 acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
272 &tz->polling_frequency);
273 if (ACPI_FAILURE(status))
274 return -ENODEV;
275
276 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
277 tz->polling_frequency));
278
279 return 0;
280 }
281
282 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
283 {
284
285 if (!tz)
286 return -EINVAL;
287
288 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */
289
290 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
291 "Polling frequency set to %lu seconds\n",
292 tz->polling_frequency/10));
293
294 return 0;
295 }
296
297 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
298 {
299 acpi_status status = AE_OK;
300 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
301 struct acpi_object_list arg_list = { 1, &arg0 };
302 acpi_handle handle = NULL;
303
304
305 if (!tz)
306 return -EINVAL;
307
308 status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
309 if (ACPI_FAILURE(status)) {
310 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
311 return -ENODEV;
312 }
313
314 arg0.integer.value = mode;
315
316 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
317 if (ACPI_FAILURE(status))
318 return -ENODEV;
319
320 return 0;
321 }
322
323 #define ACPI_TRIPS_CRITICAL 0x01
324 #define ACPI_TRIPS_HOT 0x02
325 #define ACPI_TRIPS_PASSIVE 0x04
326 #define ACPI_TRIPS_ACTIVE 0x08
327 #define ACPI_TRIPS_DEVICES 0x10
328
329 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
330 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
331
332 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
333 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
334 ACPI_TRIPS_DEVICES)
335
336 /*
337 * This exception is thrown out in two cases:
338 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
339 * when re-evaluating the AML code.
340 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
341 * We need to re-bind the cooling devices of a thermal zone when this occurs.
342 */
343 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
344 do { \
345 if (flags != ACPI_TRIPS_INIT) \
346 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
347 "ACPI thermal trip point %s changed\n" \
348 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
349 } while (0)
350
351 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
352 {
353 acpi_status status = AE_OK;
354 struct acpi_handle_list devices;
355 int valid = 0;
356 int i;
357
358 /* Critical Shutdown (required) */
359 if (flag & ACPI_TRIPS_CRITICAL) {
360 status = acpi_evaluate_integer(tz->device->handle,
361 "_CRT", NULL, &tz->trips.critical.temperature);
362 if (ACPI_FAILURE(status)) {
363 tz->trips.critical.flags.valid = 0;
364 ACPI_EXCEPTION((AE_INFO, status,
365 "No critical threshold"));
366 return -ENODEV;
367 } else {
368 tz->trips.critical.flags.valid = 1;
369 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
370 "Found critical threshold [%lu]\n",
371 tz->trips.critical.temperature));
372 }
373 if (tz->trips.critical.flags.valid == 1) {
374 if (crt == -1) {
375 tz->trips.critical.flags.valid = 0;
376 } else if (crt > 0) {
377 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
378 /*
379 * Allow override to lower critical threshold
380 */
381 if (crt_k < tz->trips.critical.temperature)
382 tz->trips.critical.temperature = crt_k;
383 }
384 }
385 }
386
387 /* Critical Sleep (optional) */
388 if (flag & ACPI_TRIPS_HOT) {
389 status = acpi_evaluate_integer(tz->device->handle,
390 "_HOT", NULL, &tz->trips.hot.temperature);
391 if (ACPI_FAILURE(status)) {
392 tz->trips.hot.flags.valid = 0;
393 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
394 "No hot threshold\n"));
395 } else {
396 tz->trips.hot.flags.valid = 1;
397 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
398 "Found hot threshold [%lu]\n",
399 tz->trips.critical.temperature));
400 }
401 }
402
403 /* Passive (optional) */
404 if (flag & ACPI_TRIPS_PASSIVE) {
405 valid = tz->trips.passive.flags.valid;
406 if (psv == -1) {
407 status = AE_SUPPORT;
408 } else if (psv > 0) {
409 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
410 status = AE_OK;
411 } else {
412 status = acpi_evaluate_integer(tz->device->handle,
413 "_PSV", NULL, &tz->trips.passive.temperature);
414 }
415
416 if (ACPI_FAILURE(status))
417 tz->trips.passive.flags.valid = 0;
418 else {
419 tz->trips.passive.flags.valid = 1;
420 if (flag == ACPI_TRIPS_INIT) {
421 status = acpi_evaluate_integer(
422 tz->device->handle, "_TC1",
423 NULL, &tz->trips.passive.tc1);
424 if (ACPI_FAILURE(status))
425 tz->trips.passive.flags.valid = 0;
426 status = acpi_evaluate_integer(
427 tz->device->handle, "_TC2",
428 NULL, &tz->trips.passive.tc2);
429 if (ACPI_FAILURE(status))
430 tz->trips.passive.flags.valid = 0;
431 status = acpi_evaluate_integer(
432 tz->device->handle, "_TSP",
433 NULL, &tz->trips.passive.tsp);
434 if (ACPI_FAILURE(status))
435 tz->trips.passive.flags.valid = 0;
436 }
437 }
438 }
439 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
440 memset(&devices, 0, sizeof(struct acpi_handle_list));
441 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
442 NULL, &devices);
443 if (ACPI_FAILURE(status))
444 tz->trips.passive.flags.valid = 0;
445 else
446 tz->trips.passive.flags.valid = 1;
447
448 if (memcmp(&tz->trips.passive.devices, &devices,
449 sizeof(struct acpi_handle_list))) {
450 memcpy(&tz->trips.passive.devices, &devices,
451 sizeof(struct acpi_handle_list));
452 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
453 }
454 }
455 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
456 if (valid != tz->trips.passive.flags.valid)
457 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
458 }
459
460 /* Active (optional) */
461 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
462 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
463 valid = tz->trips.active[i].flags.valid;
464
465 if (act == -1)
466 break; /* disable all active trip points */
467
468 if (flag & ACPI_TRIPS_ACTIVE) {
469 status = acpi_evaluate_integer(tz->device->handle,
470 name, NULL, &tz->trips.active[i].temperature);
471 if (ACPI_FAILURE(status)) {
472 tz->trips.active[i].flags.valid = 0;
473 if (i == 0)
474 break;
475 if (act <= 0)
476 break;
477 if (i == 1)
478 tz->trips.active[0].temperature =
479 CELSIUS_TO_KELVIN(act);
480 else
481 /*
482 * Don't allow override higher than
483 * the next higher trip point
484 */
485 tz->trips.active[i - 1].temperature =
486 (tz->trips.active[i - 2].temperature <
487 CELSIUS_TO_KELVIN(act) ?
488 tz->trips.active[i - 2].temperature :
489 CELSIUS_TO_KELVIN(act));
490 break;
491 } else
492 tz->trips.active[i].flags.valid = 1;
493 }
494
495 name[2] = 'L';
496 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
497 memset(&devices, 0, sizeof(struct acpi_handle_list));
498 status = acpi_evaluate_reference(tz->device->handle,
499 name, NULL, &devices);
500 if (ACPI_FAILURE(status))
501 tz->trips.active[i].flags.valid = 0;
502 else
503 tz->trips.active[i].flags.valid = 1;
504
505 if (memcmp(&tz->trips.active[i].devices, &devices,
506 sizeof(struct acpi_handle_list))) {
507 memcpy(&tz->trips.active[i].devices, &devices,
508 sizeof(struct acpi_handle_list));
509 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
510 }
511 }
512 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
513 if (valid != tz->trips.active[i].flags.valid)
514 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
515
516 if (!tz->trips.active[i].flags.valid)
517 break;
518 }
519
520 if (flag & ACPI_TRIPS_DEVICES) {
521 memset(&devices, 0, sizeof(struct acpi_handle_list));
522 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
523 NULL, &devices);
524 if (memcmp(&tz->devices, &devices,
525 sizeof(struct acpi_handle_list))) {
526 memcpy(&tz->devices, &devices,
527 sizeof(struct acpi_handle_list));
528 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
529 }
530 }
531
532 return 0;
533 }
534
535 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
536 {
537 return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
538 }
539
540 static int acpi_thermal_critical(struct acpi_thermal *tz)
541 {
542 if (!tz || !tz->trips.critical.flags.valid)
543 return -EINVAL;
544
545 if (tz->temperature >= tz->trips.critical.temperature) {
546 printk(KERN_WARNING PREFIX "Critical trip point\n");
547 tz->trips.critical.flags.enabled = 1;
548 } else if (tz->trips.critical.flags.enabled)
549 tz->trips.critical.flags.enabled = 0;
550
551 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
552 tz->trips.critical.flags.enabled);
553 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
554 tz->device->dev.bus_id,
555 ACPI_THERMAL_NOTIFY_CRITICAL,
556 tz->trips.critical.flags.enabled);
557
558 /* take no action if nocrt is set */
559 if(!nocrt) {
560 printk(KERN_EMERG
561 "Critical temperature reached (%ld C), shutting down.\n",
562 KELVIN_TO_CELSIUS(tz->temperature));
563 orderly_poweroff(true);
564 }
565
566 return 0;
567 }
568
569 static int acpi_thermal_hot(struct acpi_thermal *tz)
570 {
571 if (!tz || !tz->trips.hot.flags.valid)
572 return -EINVAL;
573
574 if (tz->temperature >= tz->trips.hot.temperature) {
575 printk(KERN_WARNING PREFIX "Hot trip point\n");
576 tz->trips.hot.flags.enabled = 1;
577 } else if (tz->trips.hot.flags.enabled)
578 tz->trips.hot.flags.enabled = 0;
579
580 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
581 tz->trips.hot.flags.enabled);
582 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
583 tz->device->dev.bus_id,
584 ACPI_THERMAL_NOTIFY_HOT,
585 tz->trips.hot.flags.enabled);
586
587 /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
588
589 return 0;
590 }
591
592 static void acpi_thermal_passive(struct acpi_thermal *tz)
593 {
594 int result = 1;
595 struct acpi_thermal_passive *passive = NULL;
596 int trend = 0;
597 int i = 0;
598
599
600 if (!tz || !tz->trips.passive.flags.valid)
601 return;
602
603 passive = &(tz->trips.passive);
604
605 /*
606 * Above Trip?
607 * -----------
608 * Calculate the thermal trend (using the passive cooling equation)
609 * and modify the performance limit for all passive cooling devices
610 * accordingly. Note that we assume symmetry.
611 */
612 if (tz->temperature >= passive->temperature) {
613 trend =
614 (passive->tc1 * (tz->temperature - tz->last_temperature)) +
615 (passive->tc2 * (tz->temperature - passive->temperature));
616 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
617 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
618 trend, passive->tc1, tz->temperature,
619 tz->last_temperature, passive->tc2,
620 tz->temperature, passive->temperature));
621 passive->flags.enabled = 1;
622 /* Heating up? */
623 if (trend > 0)
624 for (i = 0; i < passive->devices.count; i++)
625 acpi_processor_set_thermal_limit(passive->
626 devices.
627 handles[i],
628 ACPI_PROCESSOR_LIMIT_INCREMENT);
629 /* Cooling off? */
630 else if (trend < 0) {
631 for (i = 0; i < passive->devices.count; i++)
632 /*
633 * assume that we are on highest
634 * freq/lowest thrott and can leave
635 * passive mode, even in error case
636 */
637 if (!acpi_processor_set_thermal_limit
638 (passive->devices.handles[i],
639 ACPI_PROCESSOR_LIMIT_DECREMENT))
640 result = 0;
641 /*
642 * Leave cooling mode, even if the temp might
643 * higher than trip point This is because some
644 * machines might have long thermal polling
645 * frequencies (tsp) defined. We will fall back
646 * into passive mode in next cycle (probably quicker)
647 */
648 if (result) {
649 passive->flags.enabled = 0;
650 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
651 "Disabling passive cooling, still above threshold,"
652 " but we are cooling down\n"));
653 }
654 }
655 return;
656 }
657
658 /*
659 * Below Trip?
660 * -----------
661 * Implement passive cooling hysteresis to slowly increase performance
662 * and avoid thrashing around the passive trip point. Note that we
663 * assume symmetry.
664 */
665 if (!passive->flags.enabled)
666 return;
667 for (i = 0; i < passive->devices.count; i++)
668 if (!acpi_processor_set_thermal_limit
669 (passive->devices.handles[i],
670 ACPI_PROCESSOR_LIMIT_DECREMENT))
671 result = 0;
672 if (result) {
673 passive->flags.enabled = 0;
674 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
675 "Disabling passive cooling (zone is cool)\n"));
676 }
677 }
678
679 static void acpi_thermal_active(struct acpi_thermal *tz)
680 {
681 int result = 0;
682 struct acpi_thermal_active *active = NULL;
683 int i = 0;
684 int j = 0;
685 unsigned long maxtemp = 0;
686
687
688 if (!tz)
689 return;
690
691 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
692 active = &(tz->trips.active[i]);
693 if (!active || !active->flags.valid)
694 break;
695 if (tz->temperature >= active->temperature) {
696 /*
697 * Above Threshold?
698 * ----------------
699 * If not already enabled, turn ON all cooling devices
700 * associated with this active threshold.
701 */
702 if (active->temperature > maxtemp)
703 tz->state.active_index = i;
704 maxtemp = active->temperature;
705 if (active->flags.enabled)
706 continue;
707 for (j = 0; j < active->devices.count; j++) {
708 result =
709 acpi_bus_set_power(active->devices.
710 handles[j],
711 ACPI_STATE_D0);
712 if (result) {
713 printk(KERN_WARNING PREFIX
714 "Unable to turn cooling device [%p] 'on'\n",
715 active->devices.
716 handles[j]);
717 continue;
718 }
719 active->flags.enabled = 1;
720 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
721 "Cooling device [%p] now 'on'\n",
722 active->devices.handles[j]));
723 }
724 continue;
725 }
726 if (!active->flags.enabled)
727 continue;
728 /*
729 * Below Threshold?
730 * ----------------
731 * Turn OFF all cooling devices associated with this
732 * threshold.
733 */
734 for (j = 0; j < active->devices.count; j++) {
735 result = acpi_bus_set_power(active->devices.handles[j],
736 ACPI_STATE_D3);
737 if (result) {
738 printk(KERN_WARNING PREFIX
739 "Unable to turn cooling device [%p] 'off'\n",
740 active->devices.handles[j]);
741 continue;
742 }
743 active->flags.enabled = 0;
744 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
745 "Cooling device [%p] now 'off'\n",
746 active->devices.handles[j]));
747 }
748 }
749 }
750
751 static void acpi_thermal_check(void *context);
752
753 static void acpi_thermal_run(unsigned long data)
754 {
755 struct acpi_thermal *tz = (struct acpi_thermal *)data;
756 if (!tz->zombie)
757 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
758 }
759
760 static void acpi_thermal_check(void *data)
761 {
762 int result = 0;
763 struct acpi_thermal *tz = data;
764 unsigned long sleep_time = 0;
765 unsigned long timeout_jiffies = 0;
766 int i = 0;
767 struct acpi_thermal_state state;
768
769
770 if (!tz) {
771 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
772 return;
773 }
774
775 /* Check if someone else is already running */
776 if (!mutex_trylock(&tz->lock))
777 return;
778
779 state = tz->state;
780
781 result = acpi_thermal_get_temperature(tz);
782 if (result)
783 goto unlock;
784
785 if (!tz->tz_enabled)
786 goto unlock;
787
788 memset(&tz->state, 0, sizeof(tz->state));
789
790 /*
791 * Check Trip Points
792 * -----------------
793 * Compare the current temperature to the trip point values to see
794 * if we've entered one of the thermal policy states. Note that
795 * this function determines when a state is entered, but the
796 * individual policy decides when it is exited (e.g. hysteresis).
797 */
798 if (tz->trips.critical.flags.valid)
799 state.critical |=
800 (tz->temperature >= tz->trips.critical.temperature);
801 if (tz->trips.hot.flags.valid)
802 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
803 if (tz->trips.passive.flags.valid)
804 state.passive |=
805 (tz->temperature >= tz->trips.passive.temperature);
806 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
807 if (tz->trips.active[i].flags.valid)
808 state.active |=
809 (tz->temperature >=
810 tz->trips.active[i].temperature);
811
812 /*
813 * Invoke Policy
814 * -------------
815 * Separated from the above check to allow individual policy to
816 * determine when to exit a given state.
817 */
818 if (state.critical)
819 acpi_thermal_critical(tz);
820 if (state.hot)
821 acpi_thermal_hot(tz);
822 if (state.passive)
823 acpi_thermal_passive(tz);
824 if (state.active)
825 acpi_thermal_active(tz);
826
827 /*
828 * Calculate State
829 * ---------------
830 * Again, separated from the above two to allow independent policy
831 * decisions.
832 */
833 tz->state.critical = tz->trips.critical.flags.enabled;
834 tz->state.hot = tz->trips.hot.flags.enabled;
835 tz->state.passive = tz->trips.passive.flags.enabled;
836 tz->state.active = 0;
837 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
838 tz->state.active |= tz->trips.active[i].flags.enabled;
839
840 /*
841 * Calculate Sleep Time
842 * --------------------
843 * If we're in the passive state, use _TSP's value. Otherwise
844 * use the default polling frequency (e.g. _TZP). If no polling
845 * frequency is specified then we'll wait forever (at least until
846 * a thermal event occurs). Note that _TSP and _TZD values are
847 * given in 1/10th seconds (we must covert to milliseconds).
848 */
849 if (tz->state.passive) {
850 sleep_time = tz->trips.passive.tsp * 100;
851 timeout_jiffies = jiffies + (HZ * sleep_time) / 1000;
852 } else if (tz->polling_frequency > 0) {
853 sleep_time = tz->polling_frequency * 100;
854 timeout_jiffies = round_jiffies(jiffies + (HZ * sleep_time) / 1000);
855 }
856
857 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
858 tz->name, tz->temperature, sleep_time));
859
860 /*
861 * Schedule Next Poll
862 * ------------------
863 */
864 if (!sleep_time) {
865 if (timer_pending(&(tz->timer)))
866 del_timer(&(tz->timer));
867 } else {
868 if (timer_pending(&(tz->timer)))
869 mod_timer(&(tz->timer), timeout_jiffies);
870 else {
871 tz->timer.data = (unsigned long)tz;
872 tz->timer.function = acpi_thermal_run;
873 tz->timer.expires = timeout_jiffies;
874 add_timer(&(tz->timer));
875 }
876 }
877 unlock:
878 mutex_unlock(&tz->lock);
879 }
880
881 /* sys I/F for generic thermal sysfs support */
882 <<<<<<< HEAD:drivers/acpi/thermal.c
883 =======
884 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
885
886 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/thermal.c
887 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
888 {
889 struct acpi_thermal *tz = thermal->devdata;
890
891 if (!tz)
892 return -EINVAL;
893
894 <<<<<<< HEAD:drivers/acpi/thermal.c
895 return sprintf(buf, "%ld\n", KELVIN_TO_CELSIUS(tz->temperature));
896 =======
897 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature));
898 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/thermal.c
899 }
900
901 static const char enabled[] = "kernel";
902 static const char disabled[] = "user";
903 static int thermal_get_mode(struct thermal_zone_device *thermal,
904 char *buf)
905 {
906 struct acpi_thermal *tz = thermal->devdata;
907
908 if (!tz)
909 return -EINVAL;
910
911 return sprintf(buf, "%s\n", tz->tz_enabled ?
912 enabled : disabled);
913 }
914
915 static int thermal_set_mode(struct thermal_zone_device *thermal,
916 const char *buf)
917 {
918 struct acpi_thermal *tz = thermal->devdata;
919 int enable;
920
921 if (!tz)
922 return -EINVAL;
923
924 /*
925 * enable/disable thermal management from ACPI thermal driver
926 */
927 if (!strncmp(buf, enabled, sizeof enabled - 1))
928 enable = 1;
929 else if (!strncmp(buf, disabled, sizeof disabled - 1))
930 enable = 0;
931 else
932 return -EINVAL;
933
934 if (enable != tz->tz_enabled) {
935 tz->tz_enabled = enable;
936 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
937 "%s ACPI thermal control\n",
938 tz->tz_enabled ? enabled : disabled));
939 acpi_thermal_check(tz);
940 }
941 return 0;
942 }
943
944 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
945 int trip, char *buf)
946 {
947 struct acpi_thermal *tz = thermal->devdata;
948 int i;
949
950 if (!tz || trip < 0)
951 return -EINVAL;
952
953 if (tz->trips.critical.flags.valid) {
954 if (!trip)
955 return sprintf(buf, "critical\n");
956 trip--;
957 }
958
959 if (tz->trips.hot.flags.valid) {
960 if (!trip)
961 return sprintf(buf, "hot\n");
962 trip--;
963 }
964
965 if (tz->trips.passive.flags.valid) {
966 if (!trip)
967 return sprintf(buf, "passive\n");
968 trip--;
969 }
970
971 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
972 tz->trips.active[i].flags.valid; i++) {
973 if (!trip)
974 return sprintf(buf, "active%d\n", i);
975 trip--;
976 }
977
978 return -EINVAL;
979 }
980
981 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
982 int trip, char *buf)
983 {
984 struct acpi_thermal *tz = thermal->devdata;
985 int i;
986
987 if (!tz || trip < 0)
988 return -EINVAL;
989
990 if (tz->trips.critical.flags.valid) {
991 if (!trip)
992 <<<<<<< HEAD:drivers/acpi/thermal.c
993 return sprintf(buf, "%ld\n", KELVIN_TO_CELSIUS(
994 =======
995 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
996 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/thermal.c
997 tz->trips.critical.temperature));
998 trip--;
999 }
1000
1001 if (tz->trips.hot.flags.valid) {
1002 if (!trip)
1003 <<<<<<< HEAD:drivers/acpi/thermal.c
1004 return sprintf(buf, "%ld\n", KELVIN_TO_CELSIUS(
1005 =======
1006 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1007 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/thermal.c
1008 tz->trips.hot.temperature));
1009 trip--;
1010 }
1011
1012 if (tz->trips.passive.flags.valid) {
1013 if (!trip)
1014 <<<<<<< HEAD:drivers/acpi/thermal.c
1015 return sprintf(buf, "%ld\n", KELVIN_TO_CELSIUS(
1016 =======
1017 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1018 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/thermal.c
1019 tz->trips.passive.temperature));
1020 trip--;
1021 }
1022
1023 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1024 tz->trips.active[i].flags.valid; i++) {
1025 if (!trip)
1026 <<<<<<< HEAD:drivers/acpi/thermal.c
1027 return sprintf(buf, "%ld\n", KELVIN_TO_CELSIUS(
1028 =======
1029 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1030 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/acpi/thermal.c
1031 tz->trips.active[i].temperature));
1032 trip--;
1033 }
1034
1035 return -EINVAL;
1036 }
1037
1038 typedef int (*cb)(struct thermal_zone_device *, int,
1039 struct thermal_cooling_device *);
1040 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
1041 struct thermal_cooling_device *cdev,
1042 cb action)
1043 {
1044 struct acpi_device *device = cdev->devdata;
1045 struct acpi_thermal *tz = thermal->devdata;
1046 struct acpi_device *dev;
1047 acpi_status status;
1048 acpi_handle handle;
1049 int i;
1050 int j;
1051 int trip = -1;
1052 int result = 0;
1053
1054 if (tz->trips.critical.flags.valid)
1055 trip++;
1056
1057 if (tz->trips.hot.flags.valid)
1058 trip++;
1059
1060 if (tz->trips.passive.flags.valid) {
1061 trip++;
1062 for (i = 0; i < tz->trips.passive.devices.count;
1063 i++) {
1064 handle = tz->trips.passive.devices.handles[i];
1065 status = acpi_bus_get_device(handle, &dev);
1066 if (ACPI_SUCCESS(status) && (dev == device)) {
1067 result = action(thermal, trip, cdev);
1068 if (result)
1069 goto failed;
1070 }
1071 }
1072 }
1073
1074 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1075 if (!tz->trips.active[i].flags.valid)
1076 break;
1077 trip++;
1078 for (j = 0;
1079 j < tz->trips.active[i].devices.count;
1080 j++) {
1081 handle = tz->trips.active[i].devices.handles[j];
1082 status = acpi_bus_get_device(handle, &dev);
1083 if (ACPI_SUCCESS(status) && (dev == device)) {
1084 result = action(thermal, trip, cdev);
1085 if (result)
1086 goto failed;
1087 }
1088 }
1089 }
1090
1091 for (i = 0; i < tz->devices.count; i++) {
1092 handle = tz->devices.handles[i];
1093 status = acpi_bus_get_device(handle, &dev);
1094 if (ACPI_SUCCESS(status) && (dev == device)) {
1095 result = action(thermal, -1, cdev);
1096 if (result)
1097 goto failed;
1098 }
1099 }
1100
1101 failed:
1102 return result;
1103 }
1104
1105 static int
1106 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1107 struct thermal_cooling_device *cdev)
1108 {
1109 return acpi_thermal_cooling_device_cb(thermal, cdev,
1110 thermal_zone_bind_cooling_device);
1111 }
1112
1113 static int
1114 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
1115 struct thermal_cooling_device *cdev)
1116 {
1117 return acpi_thermal_cooling_device_cb(thermal, cdev,
1118 thermal_zone_unbind_cooling_device);
1119 }
1120
1121 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1122 .bind = acpi_thermal_bind_cooling_device,
1123 .unbind = acpi_thermal_unbind_cooling_device,
1124 .get_temp = thermal_get_temp,
1125 .get_mode = thermal_get_mode,
1126 .set_mode = thermal_set_mode,
1127 .get_trip_type = thermal_get_trip_type,
1128 .get_trip_temp = thermal_get_trip_temp,
1129 };
1130
1131 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1132 {
1133 int trips = 0;
1134 int result;
1135 acpi_status status;
1136 int i;
1137
1138 if (tz->trips.critical.flags.valid)
1139 trips++;
1140
1141 if (tz->trips.hot.flags.valid)
1142 trips++;
1143
1144 if (tz->trips.passive.flags.valid)
1145 trips++;
1146
1147 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1148 tz->trips.active[i].flags.valid; i++, trips++);
1149 tz->thermal_zone = thermal_zone_device_register("ACPI thermal zone",
1150 trips, tz, &acpi_thermal_zone_ops);
1151 if (!tz->thermal_zone)
1152 return -ENODEV;
1153
1154 result = sysfs_create_link(&tz->device->dev.kobj,
1155 &tz->thermal_zone->device.kobj, "thermal_zone");
1156 if (result)
1157 return result;
1158
1159 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1160 &tz->device->dev.kobj, "device");
1161 if (result)
1162 return result;
1163
1164 status = acpi_attach_data(tz->device->handle,
1165 acpi_bus_private_data_handler,
1166 tz->thermal_zone);
1167 if (ACPI_FAILURE(status)) {
1168 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1169 "Error attaching device data\n"));
1170 return -ENODEV;
1171 }
1172
1173 tz->tz_enabled = 1;
1174
1175 printk(KERN_INFO PREFIX "%s is registered as thermal_zone%d\n",
1176 tz->device->dev.bus_id, tz->thermal_zone->id);
1177 return 0;
1178 }
1179
1180 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1181 {
1182 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1183 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1184 thermal_zone_device_unregister(tz->thermal_zone);
1185 tz->thermal_zone = NULL;
1186 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
1187 }
1188
1189
1190 /* --------------------------------------------------------------------------
1191 FS Interface (/proc)
1192 -------------------------------------------------------------------------- */
1193
1194 static struct proc_dir_entry *acpi_thermal_dir;
1195
1196 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1197 {
1198 struct acpi_thermal *tz = seq->private;
1199
1200
1201 if (!tz)
1202 goto end;
1203
1204 seq_puts(seq, "state: ");
1205
1206 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1207 && !tz->state.active)
1208 seq_puts(seq, "ok\n");
1209 else {
1210 if (tz->state.critical)
1211 seq_puts(seq, "critical ");
1212 if (tz->state.hot)
1213 seq_puts(seq, "hot ");
1214 if (tz->state.passive)
1215 seq_puts(seq, "passive ");
1216 if (tz->state.active)
1217 seq_printf(seq, "active[%d]", tz->state.active_index);
1218 seq_puts(seq, "\n");
1219 }
1220
1221 end:
1222 return 0;
1223 }
1224
1225 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1226 {
1227 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1228 }
1229
1230 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1231 {
1232 int result = 0;
1233 struct acpi_thermal *tz = seq->private;
1234
1235
1236 if (!tz)
1237 goto end;
1238
1239 result = acpi_thermal_get_temperature(tz);
1240 if (result)
1241 goto end;
1242
1243 seq_printf(seq, "temperature: %ld C\n",
1244 KELVIN_TO_CELSIUS(tz->temperature));
1245
1246 end:
1247 return 0;
1248 }
1249
1250 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1251 {
1252 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1253 }
1254
1255 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1256 {
1257 struct acpi_thermal *tz = seq->private;
1258 struct acpi_device *device;
1259 acpi_status status;
1260
1261 int i = 0;
1262 int j = 0;
1263
1264
1265 if (!tz)
1266 goto end;
1267
1268 if (tz->trips.critical.flags.valid)
1269 seq_printf(seq, "critical (S5): %ld C%s",
1270 KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1271 nocrt ? " <disabled>\n" : "\n");
1272
1273 if (tz->trips.hot.flags.valid)
1274 seq_printf(seq, "hot (S4): %ld C%s",
1275 KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1276 nocrt ? " <disabled>\n" : "\n");
1277
1278 if (tz->trips.passive.flags.valid) {
1279 seq_printf(seq,
1280 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1281 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1282 tz->trips.passive.tc1, tz->trips.passive.tc2,
1283 tz->trips.passive.tsp);
1284 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1285 status = acpi_bus_get_device(tz->trips.passive.devices.
1286 handles[j], &device);
1287 seq_printf(seq, "%4.4s ", status ? "" :
1288 acpi_device_bid(device));
1289 }
1290 seq_puts(seq, "\n");
1291 }
1292
1293 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1294 if (!(tz->trips.active[i].flags.valid))
1295 break;
1296 seq_printf(seq, "active[%d]: %ld C: devices=",
1297 i,
1298 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1299 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1300 status = acpi_bus_get_device(tz->trips.active[i].
1301 devices.handles[j],
1302 &device);
1303 seq_printf(seq, "%4.4s ", status ? "" :
1304 acpi_device_bid(device));
1305 }
1306 seq_puts(seq, "\n");
1307 }
1308
1309 end:
1310 return 0;
1311 }
1312
1313 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1314 {
1315 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1316 }
1317
1318 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1319 {
1320 struct acpi_thermal *tz = seq->private;
1321
1322
1323 if (!tz)
1324 goto end;
1325
1326 if (!tz->flags.cooling_mode)
1327 seq_puts(seq, "<setting not supported>\n");
1328 else
1329 seq_puts(seq, "0 - Active; 1 - Passive\n");
1330
1331 end:
1332 return 0;
1333 }
1334
1335 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1336 {
1337 return single_open(file, acpi_thermal_cooling_seq_show,
1338 PDE(inode)->data);
1339 }
1340
1341 static ssize_t
1342 acpi_thermal_write_cooling_mode(struct file *file,
1343 const char __user * buffer,
1344 size_t count, loff_t * ppos)
1345 {
1346 struct seq_file *m = file->private_data;
1347 struct acpi_thermal *tz = m->private;
1348 int result = 0;
1349 char mode_string[12] = { '\0' };
1350
1351
1352 if (!tz || (count > sizeof(mode_string) - 1))
1353 return -EINVAL;
1354
1355 if (!tz->flags.cooling_mode)
1356 return -ENODEV;
1357
1358 if (copy_from_user(mode_string, buffer, count))
1359 return -EFAULT;
1360
1361 mode_string[count] = '\0';
1362
1363 result = acpi_thermal_set_cooling_mode(tz,
1364 simple_strtoul(mode_string, NULL,
1365 0));
1366 if (result)
1367 return result;
1368
1369 acpi_thermal_check(tz);
1370
1371 return count;
1372 }
1373
1374 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1375 {
1376 struct acpi_thermal *tz = seq->private;
1377
1378
1379 if (!tz)
1380 goto end;
1381
1382 if (!tz->polling_frequency) {
1383 seq_puts(seq, "<polling disabled>\n");
1384 goto end;
1385 }
1386
1387 seq_printf(seq, "polling frequency: %lu seconds\n",
1388 (tz->polling_frequency / 10));
1389
1390 end:
1391 return 0;
1392 }
1393
1394 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1395 {
1396 return single_open(file, acpi_thermal_polling_seq_show,
1397 PDE(inode)->data);
1398 }
1399
1400 static ssize_t
1401 acpi_thermal_write_polling(struct file *file,
1402 const char __user * buffer,
1403 size_t count, loff_t * ppos)
1404 {
1405 struct seq_file *m = file->private_data;
1406 struct acpi_thermal *tz = m->private;
1407 int result = 0;
1408 char polling_string[12] = { '\0' };
1409 int seconds = 0;
1410
1411
1412 if (!tz || (count > sizeof(polling_string) - 1))
1413 return -EINVAL;
1414
1415 if (copy_from_user(polling_string, buffer, count))
1416 return -EFAULT;
1417
1418 polling_string[count] = '\0';
1419
1420 seconds = simple_strtoul(polling_string, NULL, 0);
1421
1422 result = acpi_thermal_set_polling(tz, seconds);
1423 if (result)
1424 return result;
1425
1426 acpi_thermal_check(tz);
1427
1428 return count;
1429 }
1430
1431 static int acpi_thermal_add_fs(struct acpi_device *device)
1432 {
1433 struct proc_dir_entry *entry = NULL;
1434
1435
1436 if (!acpi_device_dir(device)) {
1437 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1438 acpi_thermal_dir);
1439 if (!acpi_device_dir(device))
1440 return -ENODEV;
1441 acpi_device_dir(device)->owner = THIS_MODULE;
1442 }
1443
1444 /* 'state' [R] */
1445 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1446 S_IRUGO, acpi_device_dir(device));
1447 if (!entry)
1448 return -ENODEV;
1449 else {
1450 entry->proc_fops = &acpi_thermal_state_fops;
1451 entry->data = acpi_driver_data(device);
1452 entry->owner = THIS_MODULE;
1453 }
1454
1455 /* 'temperature' [R] */
1456 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1457 S_IRUGO, acpi_device_dir(device));
1458 if (!entry)
1459 return -ENODEV;
1460 else {
1461 entry->proc_fops = &acpi_thermal_temp_fops;
1462 entry->data = acpi_driver_data(device);
1463 entry->owner = THIS_MODULE;
1464 }
1465
1466 /* 'trip_points' [R] */
1467 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1468 S_IRUGO,
1469 acpi_device_dir(device));
1470 if (!entry)
1471 return -ENODEV;
1472 else {
1473 entry->proc_fops = &acpi_thermal_trip_fops;
1474 entry->data = acpi_driver_data(device);
1475 entry->owner = THIS_MODULE;
1476 }
1477
1478 /* 'cooling_mode' [R/W] */
1479 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1480 S_IFREG | S_IRUGO | S_IWUSR,
1481 acpi_device_dir(device));
1482 if (!entry)
1483 return -ENODEV;
1484 else {
1485 entry->proc_fops = &acpi_thermal_cooling_fops;
1486 entry->data = acpi_driver_data(device);
1487 entry->owner = THIS_MODULE;
1488 }
1489
1490 /* 'polling_frequency' [R/W] */
1491 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1492 S_IFREG | S_IRUGO | S_IWUSR,
1493 acpi_device_dir(device));
1494 if (!entry)
1495 return -ENODEV;
1496 else {
1497 entry->proc_fops = &acpi_thermal_polling_fops;
1498 entry->data = acpi_driver_data(device);
1499 entry->owner = THIS_MODULE;
1500 }
1501
1502 return 0;
1503 }
1504
1505 static int acpi_thermal_remove_fs(struct acpi_device *device)
1506 {
1507
1508 if (acpi_device_dir(device)) {
1509 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1510 acpi_device_dir(device));
1511 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1512 acpi_device_dir(device));
1513 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1514 acpi_device_dir(device));
1515 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1516 acpi_device_dir(device));
1517 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1518 acpi_device_dir(device));
1519 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1520 acpi_device_dir(device) = NULL;
1521 }
1522
1523 return 0;
1524 }
1525
1526 /* --------------------------------------------------------------------------
1527 Driver Interface
1528 -------------------------------------------------------------------------- */
1529
1530 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1531 {
1532 struct acpi_thermal *tz = data;
1533 struct acpi_device *device = NULL;
1534
1535
1536 if (!tz)
1537 return;
1538
1539 device = tz->device;
1540
1541 switch (event) {
1542 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1543 acpi_thermal_check(tz);
1544 break;
1545 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1546 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1547 acpi_thermal_check(tz);
1548 acpi_bus_generate_proc_event(device, event, 0);
1549 acpi_bus_generate_netlink_event(device->pnp.device_class,
1550 device->dev.bus_id, event, 0);
1551 break;
1552 case ACPI_THERMAL_NOTIFY_DEVICES:
1553 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1554 acpi_thermal_check(tz);
1555 acpi_bus_generate_proc_event(device, event, 0);
1556 acpi_bus_generate_netlink_event(device->pnp.device_class,
1557 device->dev.bus_id, event, 0);
1558 break;
1559 default:
1560 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1561 "Unsupported event [0x%x]\n", event));
1562 break;
1563 }
1564
1565 return;
1566 }
1567
1568 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1569 {
1570 int result = 0;
1571
1572
1573 if (!tz)
1574 return -EINVAL;
1575
1576 /* Get temperature [_TMP] (required) */
1577 result = acpi_thermal_get_temperature(tz);
1578 if (result)
1579 return result;
1580
1581 /* Get trip points [_CRT, _PSV, etc.] (required) */
1582 result = acpi_thermal_get_trip_points(tz);
1583 if (result)
1584 return result;
1585
1586 /* Set the cooling mode [_SCP] to active cooling (default) */
1587 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1588 if (!result)
1589 tz->flags.cooling_mode = 1;
1590
1591 /* Get default polling frequency [_TZP] (optional) */
1592 if (tzp)
1593 tz->polling_frequency = tzp;
1594 else
1595 acpi_thermal_get_polling_frequency(tz);
1596
1597 return 0;
1598 }
1599
1600 static int acpi_thermal_add(struct acpi_device *device)
1601 {
1602 int result = 0;
1603 acpi_status status = AE_OK;
1604 struct acpi_thermal *tz = NULL;
1605
1606
1607 if (!device)
1608 return -EINVAL;
1609
1610 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1611 if (!tz)
1612 return -ENOMEM;
1613
1614 tz->device = device;
1615 strcpy(tz->name, device->pnp.bus_id);
1616 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1617 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1618 acpi_driver_data(device) = tz;
1619 mutex_init(&tz->lock);
1620
1621
1622 result = acpi_thermal_get_info(tz);
1623 if (result)
1624 goto free_memory;
1625
1626 result = acpi_thermal_register_thermal_zone(tz);
1627 if (result)
1628 goto free_memory;
1629
1630 result = acpi_thermal_add_fs(device);
1631 if (result)
1632 goto unregister_thermal_zone;
1633
1634 init_timer(&tz->timer);
1635
1636 acpi_thermal_check(tz);
1637
1638 status = acpi_install_notify_handler(device->handle,
1639 ACPI_DEVICE_NOTIFY,
1640 acpi_thermal_notify, tz);
1641 if (ACPI_FAILURE(status)) {
1642 result = -ENODEV;
1643 goto remove_fs;
1644 }
1645
1646 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1647 acpi_device_name(device), acpi_device_bid(device),
1648 KELVIN_TO_CELSIUS(tz->temperature));
1649 goto end;
1650
1651 remove_fs:
1652 acpi_thermal_remove_fs(device);
1653 unregister_thermal_zone:
1654 thermal_zone_device_unregister(tz->thermal_zone);
1655 free_memory:
1656 kfree(tz);
1657 end:
1658 return result;
1659 }
1660
1661 static int acpi_thermal_remove(struct acpi_device *device, int type)
1662 {
1663 acpi_status status = AE_OK;
1664 struct acpi_thermal *tz = NULL;
1665
1666
1667 if (!device || !acpi_driver_data(device))
1668 return -EINVAL;
1669
1670 tz = acpi_driver_data(device);
1671
1672 /* avoid timer adding new defer task */
1673 tz->zombie = 1;
1674 /* wait for running timer (on other CPUs) finish */
1675 del_timer_sync(&(tz->timer));
1676 /* synchronize deferred task */
1677 acpi_os_wait_events_complete(NULL);
1678 /* deferred task may reinsert timer */
1679 del_timer_sync(&(tz->timer));
1680
1681 status = acpi_remove_notify_handler(device->handle,
1682 ACPI_DEVICE_NOTIFY,
1683 acpi_thermal_notify);
1684
1685 /* Terminate policy */
1686 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1687 tz->trips.passive.flags.enabled = 0;
1688 acpi_thermal_passive(tz);
1689 }
1690 if (tz->trips.active[0].flags.valid
1691 && tz->trips.active[0].flags.enabled) {
1692 tz->trips.active[0].flags.enabled = 0;
1693 acpi_thermal_active(tz);
1694 }
1695
1696 acpi_thermal_remove_fs(device);
1697 acpi_thermal_unregister_thermal_zone(tz);
1698 mutex_destroy(&tz->lock);
1699 kfree(tz);
1700 return 0;
1701 }
1702
1703 static int acpi_thermal_resume(struct acpi_device *device)
1704 {
1705 struct acpi_thermal *tz = NULL;
1706 int i, j, power_state, result;
1707
1708
1709 if (!device || !acpi_driver_data(device))
1710 return -EINVAL;
1711
1712 tz = acpi_driver_data(device);
1713
1714 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1715 if (!(&tz->trips.active[i]))
1716 break;
1717 if (!tz->trips.active[i].flags.valid)
1718 break;
1719 tz->trips.active[i].flags.enabled = 1;
1720 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1721 result = acpi_bus_get_power(tz->trips.active[i].devices.
1722 handles[j], &power_state);
1723 if (result || (power_state != ACPI_STATE_D0)) {
1724 tz->trips.active[i].flags.enabled = 0;
1725 break;
1726 }
1727 }
1728 tz->state.active |= tz->trips.active[i].flags.enabled;
1729 }
1730
1731 acpi_thermal_check(tz);
1732
1733 return AE_OK;
1734 }
1735
1736 #ifdef CONFIG_DMI
1737 static int thermal_act(const struct dmi_system_id *d) {
1738
1739 if (act == 0) {
1740 printk(KERN_NOTICE "ACPI: %s detected: "
1741 "disabling all active thermal trip points\n", d->ident);
1742 act = -1;
1743 }
1744 return 0;
1745 }
1746 static int thermal_nocrt(const struct dmi_system_id *d) {
1747
1748 printk(KERN_NOTICE "ACPI: %s detected: "
1749 "disabling all critical thermal trip point actions.\n", d->ident);
1750 nocrt = 1;
1751 return 0;
1752 }
1753 static int thermal_tzp(const struct dmi_system_id *d) {
1754
1755 if (tzp == 0) {
1756 printk(KERN_NOTICE "ACPI: %s detected: "
1757 "enabling thermal zone polling\n", d->ident);
1758 tzp = 300; /* 300 dS = 30 Seconds */
1759 }
1760 return 0;
1761 }
1762 static int thermal_psv(const struct dmi_system_id *d) {
1763
1764 if (psv == 0) {
1765 printk(KERN_NOTICE "ACPI: %s detected: "
1766 "disabling all passive thermal trip points\n", d->ident);
1767 psv = -1;
1768 }
1769 return 0;
1770 }
1771
1772 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1773 /*
1774 * Award BIOS on this AOpen makes thermal control almost worthless.
1775 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1776 */
1777 {
1778 .callback = thermal_act,
1779 .ident = "AOpen i915GMm-HFS",
1780 .matches = {
1781 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1782 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1783 },
1784 },
1785 {
1786 .callback = thermal_psv,
1787 .ident = "AOpen i915GMm-HFS",
1788 .matches = {
1789 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1790 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1791 },
1792 },
1793 {
1794 .callback = thermal_tzp,
1795 .ident = "AOpen i915GMm-HFS",
1796 .matches = {
1797 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1798 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1799 },
1800 },
1801 {
1802 .callback = thermal_nocrt,
1803 .ident = "Gigabyte GA-7ZX",
1804 .matches = {
1805 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1806 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1807 },
1808 },
1809 {}
1810 };
1811 #endif /* CONFIG_DMI */
1812
1813 static int __init acpi_thermal_init(void)
1814 {
1815 int result = 0;
1816
1817 dmi_check_system(thermal_dmi_table);
1818
1819 if (off) {
1820 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1821 return -ENODEV;
1822 }
1823 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1824 if (!acpi_thermal_dir)
1825 return -ENODEV;
1826 acpi_thermal_dir->owner = THIS_MODULE;
1827
1828 result = acpi_bus_register_driver(&acpi_thermal_driver);
1829 if (result < 0) {
1830 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1831 return -ENODEV;
1832 }
1833
1834 return 0;
1835 }
1836
1837 static void __exit acpi_thermal_exit(void)
1838 {
1839
1840 acpi_bus_unregister_driver(&acpi_thermal_driver);
1841
1842 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1843
1844 return;
1845 }
1846
1847 module_init(acpi_thermal_init);
1848 module_exit(acpi_thermal_exit);
WRT350N Kernel Patches