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Linux 2.6.25
[linux-2.6/s3c2410-cpufreq.git] / drivers / acpi / thermal.c
blob1bcecc7dd2cab63abd3f06e5d3750694a4fe95e6
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 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
883
884 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
885 {
886 struct acpi_thermal *tz = thermal->devdata;
887
888 if (!tz)
889 return -EINVAL;
890
891 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature));
892 }
893
894 static const char enabled[] = "kernel";
895 static const char disabled[] = "user";
896 static int thermal_get_mode(struct thermal_zone_device *thermal,
897 char *buf)
898 {
899 struct acpi_thermal *tz = thermal->devdata;
900
901 if (!tz)
902 return -EINVAL;
903
904 return sprintf(buf, "%s\n", tz->tz_enabled ?
905 enabled : disabled);
906 }
907
908 static int thermal_set_mode(struct thermal_zone_device *thermal,
909 const char *buf)
910 {
911 struct acpi_thermal *tz = thermal->devdata;
912 int enable;
913
914 if (!tz)
915 return -EINVAL;
916
917 /*
918 * enable/disable thermal management from ACPI thermal driver
919 */
920 if (!strncmp(buf, enabled, sizeof enabled - 1))
921 enable = 1;
922 else if (!strncmp(buf, disabled, sizeof disabled - 1))
923 enable = 0;
924 else
925 return -EINVAL;
926
927 if (enable != tz->tz_enabled) {
928 tz->tz_enabled = enable;
929 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
930 "%s ACPI thermal control\n",
931 tz->tz_enabled ? enabled : disabled));
932 acpi_thermal_check(tz);
933 }
934 return 0;
935 }
936
937 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
938 int trip, char *buf)
939 {
940 struct acpi_thermal *tz = thermal->devdata;
941 int i;
942
943 if (!tz || trip < 0)
944 return -EINVAL;
945
946 if (tz->trips.critical.flags.valid) {
947 if (!trip)
948 return sprintf(buf, "critical\n");
949 trip--;
950 }
951
952 if (tz->trips.hot.flags.valid) {
953 if (!trip)
954 return sprintf(buf, "hot\n");
955 trip--;
956 }
957
958 if (tz->trips.passive.flags.valid) {
959 if (!trip)
960 return sprintf(buf, "passive\n");
961 trip--;
962 }
963
964 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
965 tz->trips.active[i].flags.valid; i++) {
966 if (!trip)
967 return sprintf(buf, "active%d\n", i);
968 trip--;
969 }
970
971 return -EINVAL;
972 }
973
974 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
975 int trip, char *buf)
976 {
977 struct acpi_thermal *tz = thermal->devdata;
978 int i;
979
980 if (!tz || trip < 0)
981 return -EINVAL;
982
983 if (tz->trips.critical.flags.valid) {
984 if (!trip)
985 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
986 tz->trips.critical.temperature));
987 trip--;
988 }
989
990 if (tz->trips.hot.flags.valid) {
991 if (!trip)
992 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
993 tz->trips.hot.temperature));
994 trip--;
995 }
996
997 if (tz->trips.passive.flags.valid) {
998 if (!trip)
999 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1000 tz->trips.passive.temperature));
1001 trip--;
1002 }
1003
1004 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1005 tz->trips.active[i].flags.valid; i++) {
1006 if (!trip)
1007 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1008 tz->trips.active[i].temperature));
1009 trip--;
1010 }
1011
1012 return -EINVAL;
1013 }
1014
1015 typedef int (*cb)(struct thermal_zone_device *, int,
1016 struct thermal_cooling_device *);
1017 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
1018 struct thermal_cooling_device *cdev,
1019 cb action)
1020 {
1021 struct acpi_device *device = cdev->devdata;
1022 struct acpi_thermal *tz = thermal->devdata;
1023 struct acpi_device *dev;
1024 acpi_status status;
1025 acpi_handle handle;
1026 int i;
1027 int j;
1028 int trip = -1;
1029 int result = 0;
1030
1031 if (tz->trips.critical.flags.valid)
1032 trip++;
1033
1034 if (tz->trips.hot.flags.valid)
1035 trip++;
1036
1037 if (tz->trips.passive.flags.valid) {
1038 trip++;
1039 for (i = 0; i < tz->trips.passive.devices.count;
1040 i++) {
1041 handle = tz->trips.passive.devices.handles[i];
1042 status = acpi_bus_get_device(handle, &dev);
1043 if (ACPI_SUCCESS(status) && (dev == device)) {
1044 result = action(thermal, trip, cdev);
1045 if (result)
1046 goto failed;
1047 }
1048 }
1049 }
1050
1051 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1052 if (!tz->trips.active[i].flags.valid)
1053 break;
1054 trip++;
1055 for (j = 0;
1056 j < tz->trips.active[i].devices.count;
1057 j++) {
1058 handle = tz->trips.active[i].devices.handles[j];
1059 status = acpi_bus_get_device(handle, &dev);
1060 if (ACPI_SUCCESS(status) && (dev == device)) {
1061 result = action(thermal, trip, cdev);
1062 if (result)
1063 goto failed;
1064 }
1065 }
1066 }
1067
1068 for (i = 0; i < tz->devices.count; i++) {
1069 handle = tz->devices.handles[i];
1070 status = acpi_bus_get_device(handle, &dev);
1071 if (ACPI_SUCCESS(status) && (dev == device)) {
1072 result = action(thermal, -1, cdev);
1073 if (result)
1074 goto failed;
1075 }
1076 }
1077
1078 failed:
1079 return result;
1080 }
1081
1082 static int
1083 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1084 struct thermal_cooling_device *cdev)
1085 {
1086 return acpi_thermal_cooling_device_cb(thermal, cdev,
1087 thermal_zone_bind_cooling_device);
1088 }
1089
1090 static int
1091 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
1092 struct thermal_cooling_device *cdev)
1093 {
1094 return acpi_thermal_cooling_device_cb(thermal, cdev,
1095 thermal_zone_unbind_cooling_device);
1096 }
1097
1098 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1099 .bind = acpi_thermal_bind_cooling_device,
1100 .unbind = acpi_thermal_unbind_cooling_device,
1101 .get_temp = thermal_get_temp,
1102 .get_mode = thermal_get_mode,
1103 .set_mode = thermal_set_mode,
1104 .get_trip_type = thermal_get_trip_type,
1105 .get_trip_temp = thermal_get_trip_temp,
1106 };
1107
1108 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1109 {
1110 int trips = 0;
1111 int result;
1112 acpi_status status;
1113 int i;
1114
1115 if (tz->trips.critical.flags.valid)
1116 trips++;
1117
1118 if (tz->trips.hot.flags.valid)
1119 trips++;
1120
1121 if (tz->trips.passive.flags.valid)
1122 trips++;
1123
1124 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1125 tz->trips.active[i].flags.valid; i++, trips++);
1126 tz->thermal_zone = thermal_zone_device_register("ACPI thermal zone",
1127 trips, tz, &acpi_thermal_zone_ops);
1128 if (IS_ERR(tz->thermal_zone))
1129 return -ENODEV;
1130
1131 result = sysfs_create_link(&tz->device->dev.kobj,
1132 &tz->thermal_zone->device.kobj, "thermal_zone");
1133 if (result)
1134 return result;
1135
1136 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1137 &tz->device->dev.kobj, "device");
1138 if (result)
1139 return result;
1140
1141 status = acpi_attach_data(tz->device->handle,
1142 acpi_bus_private_data_handler,
1143 tz->thermal_zone);
1144 if (ACPI_FAILURE(status)) {
1145 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1146 "Error attaching device data\n"));
1147 return -ENODEV;
1148 }
1149
1150 tz->tz_enabled = 1;
1151
1152 printk(KERN_INFO PREFIX "%s is registered as thermal_zone%d\n",
1153 tz->device->dev.bus_id, tz->thermal_zone->id);
1154 return 0;
1155 }
1156
1157 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1158 {
1159 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1160 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1161 thermal_zone_device_unregister(tz->thermal_zone);
1162 tz->thermal_zone = NULL;
1163 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
1164 }
1165
1166
1167 /* --------------------------------------------------------------------------
1168 FS Interface (/proc)
1169 -------------------------------------------------------------------------- */
1170
1171 static struct proc_dir_entry *acpi_thermal_dir;
1172
1173 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1174 {
1175 struct acpi_thermal *tz = seq->private;
1176
1177
1178 if (!tz)
1179 goto end;
1180
1181 seq_puts(seq, "state: ");
1182
1183 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1184 && !tz->state.active)
1185 seq_puts(seq, "ok\n");
1186 else {
1187 if (tz->state.critical)
1188 seq_puts(seq, "critical ");
1189 if (tz->state.hot)
1190 seq_puts(seq, "hot ");
1191 if (tz->state.passive)
1192 seq_puts(seq, "passive ");
1193 if (tz->state.active)
1194 seq_printf(seq, "active[%d]", tz->state.active_index);
1195 seq_puts(seq, "\n");
1196 }
1197
1198 end:
1199 return 0;
1200 }
1201
1202 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1203 {
1204 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1205 }
1206
1207 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1208 {
1209 int result = 0;
1210 struct acpi_thermal *tz = seq->private;
1211
1212
1213 if (!tz)
1214 goto end;
1215
1216 result = acpi_thermal_get_temperature(tz);
1217 if (result)
1218 goto end;
1219
1220 seq_printf(seq, "temperature: %ld C\n",
1221 KELVIN_TO_CELSIUS(tz->temperature));
1222
1223 end:
1224 return 0;
1225 }
1226
1227 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1228 {
1229 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1230 }
1231
1232 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1233 {
1234 struct acpi_thermal *tz = seq->private;
1235 struct acpi_device *device;
1236 acpi_status status;
1237
1238 int i = 0;
1239 int j = 0;
1240
1241
1242 if (!tz)
1243 goto end;
1244
1245 if (tz->trips.critical.flags.valid)
1246 seq_printf(seq, "critical (S5): %ld C%s",
1247 KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1248 nocrt ? " <disabled>\n" : "\n");
1249
1250 if (tz->trips.hot.flags.valid)
1251 seq_printf(seq, "hot (S4): %ld C%s",
1252 KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1253 nocrt ? " <disabled>\n" : "\n");
1254
1255 if (tz->trips.passive.flags.valid) {
1256 seq_printf(seq,
1257 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1258 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1259 tz->trips.passive.tc1, tz->trips.passive.tc2,
1260 tz->trips.passive.tsp);
1261 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1262 status = acpi_bus_get_device(tz->trips.passive.devices.
1263 handles[j], &device);
1264 seq_printf(seq, "%4.4s ", status ? "" :
1265 acpi_device_bid(device));
1266 }
1267 seq_puts(seq, "\n");
1268 }
1269
1270 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1271 if (!(tz->trips.active[i].flags.valid))
1272 break;
1273 seq_printf(seq, "active[%d]: %ld C: devices=",
1274 i,
1275 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1276 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1277 status = acpi_bus_get_device(tz->trips.active[i].
1278 devices.handles[j],
1279 &device);
1280 seq_printf(seq, "%4.4s ", status ? "" :
1281 acpi_device_bid(device));
1282 }
1283 seq_puts(seq, "\n");
1284 }
1285
1286 end:
1287 return 0;
1288 }
1289
1290 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1291 {
1292 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1293 }
1294
1295 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1296 {
1297 struct acpi_thermal *tz = seq->private;
1298
1299
1300 if (!tz)
1301 goto end;
1302
1303 if (!tz->flags.cooling_mode)
1304 seq_puts(seq, "<setting not supported>\n");
1305 else
1306 seq_puts(seq, "0 - Active; 1 - Passive\n");
1307
1308 end:
1309 return 0;
1310 }
1311
1312 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1313 {
1314 return single_open(file, acpi_thermal_cooling_seq_show,
1315 PDE(inode)->data);
1316 }
1317
1318 static ssize_t
1319 acpi_thermal_write_cooling_mode(struct file *file,
1320 const char __user * buffer,
1321 size_t count, loff_t * ppos)
1322 {
1323 struct seq_file *m = file->private_data;
1324 struct acpi_thermal *tz = m->private;
1325 int result = 0;
1326 char mode_string[12] = { '\0' };
1327
1328
1329 if (!tz || (count > sizeof(mode_string) - 1))
1330 return -EINVAL;
1331
1332 if (!tz->flags.cooling_mode)
1333 return -ENODEV;
1334
1335 if (copy_from_user(mode_string, buffer, count))
1336 return -EFAULT;
1337
1338 mode_string[count] = '\0';
1339
1340 result = acpi_thermal_set_cooling_mode(tz,
1341 simple_strtoul(mode_string, NULL,
1342 0));
1343 if (result)
1344 return result;
1345
1346 acpi_thermal_check(tz);
1347
1348 return count;
1349 }
1350
1351 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1352 {
1353 struct acpi_thermal *tz = seq->private;
1354
1355
1356 if (!tz)
1357 goto end;
1358
1359 if (!tz->polling_frequency) {
1360 seq_puts(seq, "<polling disabled>\n");
1361 goto end;
1362 }
1363
1364 seq_printf(seq, "polling frequency: %lu seconds\n",
1365 (tz->polling_frequency / 10));
1366
1367 end:
1368 return 0;
1369 }
1370
1371 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1372 {
1373 return single_open(file, acpi_thermal_polling_seq_show,
1374 PDE(inode)->data);
1375 }
1376
1377 static ssize_t
1378 acpi_thermal_write_polling(struct file *file,
1379 const char __user * buffer,
1380 size_t count, loff_t * ppos)
1381 {
1382 struct seq_file *m = file->private_data;
1383 struct acpi_thermal *tz = m->private;
1384 int result = 0;
1385 char polling_string[12] = { '\0' };
1386 int seconds = 0;
1387
1388
1389 if (!tz || (count > sizeof(polling_string) - 1))
1390 return -EINVAL;
1391
1392 if (copy_from_user(polling_string, buffer, count))
1393 return -EFAULT;
1394
1395 polling_string[count] = '\0';
1396
1397 seconds = simple_strtoul(polling_string, NULL, 0);
1398
1399 result = acpi_thermal_set_polling(tz, seconds);
1400 if (result)
1401 return result;
1402
1403 acpi_thermal_check(tz);
1404
1405 return count;
1406 }
1407
1408 static int acpi_thermal_add_fs(struct acpi_device *device)
1409 {
1410 struct proc_dir_entry *entry = NULL;
1411
1412
1413 if (!acpi_device_dir(device)) {
1414 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1415 acpi_thermal_dir);
1416 if (!acpi_device_dir(device))
1417 return -ENODEV;
1418 acpi_device_dir(device)->owner = THIS_MODULE;
1419 }
1420
1421 /* 'state' [R] */
1422 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1423 S_IRUGO, acpi_device_dir(device));
1424 if (!entry)
1425 return -ENODEV;
1426 else {
1427 entry->proc_fops = &acpi_thermal_state_fops;
1428 entry->data = acpi_driver_data(device);
1429 entry->owner = THIS_MODULE;
1430 }
1431
1432 /* 'temperature' [R] */
1433 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1434 S_IRUGO, acpi_device_dir(device));
1435 if (!entry)
1436 return -ENODEV;
1437 else {
1438 entry->proc_fops = &acpi_thermal_temp_fops;
1439 entry->data = acpi_driver_data(device);
1440 entry->owner = THIS_MODULE;
1441 }
1442
1443 /* 'trip_points' [R] */
1444 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1445 S_IRUGO,
1446 acpi_device_dir(device));
1447 if (!entry)
1448 return -ENODEV;
1449 else {
1450 entry->proc_fops = &acpi_thermal_trip_fops;
1451 entry->data = acpi_driver_data(device);
1452 entry->owner = THIS_MODULE;
1453 }
1454
1455 /* 'cooling_mode' [R/W] */
1456 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1457 S_IFREG | S_IRUGO | S_IWUSR,
1458 acpi_device_dir(device));
1459 if (!entry)
1460 return -ENODEV;
1461 else {
1462 entry->proc_fops = &acpi_thermal_cooling_fops;
1463 entry->data = acpi_driver_data(device);
1464 entry->owner = THIS_MODULE;
1465 }
1466
1467 /* 'polling_frequency' [R/W] */
1468 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1469 S_IFREG | S_IRUGO | S_IWUSR,
1470 acpi_device_dir(device));
1471 if (!entry)
1472 return -ENODEV;
1473 else {
1474 entry->proc_fops = &acpi_thermal_polling_fops;
1475 entry->data = acpi_driver_data(device);
1476 entry->owner = THIS_MODULE;
1477 }
1478
1479 return 0;
1480 }
1481
1482 static int acpi_thermal_remove_fs(struct acpi_device *device)
1483 {
1484
1485 if (acpi_device_dir(device)) {
1486 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1487 acpi_device_dir(device));
1488 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1489 acpi_device_dir(device));
1490 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1491 acpi_device_dir(device));
1492 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1493 acpi_device_dir(device));
1494 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1495 acpi_device_dir(device));
1496 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1497 acpi_device_dir(device) = NULL;
1498 }
1499
1500 return 0;
1501 }
1502
1503 /* --------------------------------------------------------------------------
1504 Driver Interface
1505 -------------------------------------------------------------------------- */
1506
1507 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1508 {
1509 struct acpi_thermal *tz = data;
1510 struct acpi_device *device = NULL;
1511
1512
1513 if (!tz)
1514 return;
1515
1516 device = tz->device;
1517
1518 switch (event) {
1519 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1520 acpi_thermal_check(tz);
1521 break;
1522 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1523 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1524 acpi_thermal_check(tz);
1525 acpi_bus_generate_proc_event(device, event, 0);
1526 acpi_bus_generate_netlink_event(device->pnp.device_class,
1527 device->dev.bus_id, event, 0);
1528 break;
1529 case ACPI_THERMAL_NOTIFY_DEVICES:
1530 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1531 acpi_thermal_check(tz);
1532 acpi_bus_generate_proc_event(device, event, 0);
1533 acpi_bus_generate_netlink_event(device->pnp.device_class,
1534 device->dev.bus_id, event, 0);
1535 break;
1536 default:
1537 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1538 "Unsupported event [0x%x]\n", event));
1539 break;
1540 }
1541
1542 return;
1543 }
1544
1545 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1546 {
1547 int result = 0;
1548
1549
1550 if (!tz)
1551 return -EINVAL;
1552
1553 /* Get temperature [_TMP] (required) */
1554 result = acpi_thermal_get_temperature(tz);
1555 if (result)
1556 return result;
1557
1558 /* Get trip points [_CRT, _PSV, etc.] (required) */
1559 result = acpi_thermal_get_trip_points(tz);
1560 if (result)
1561 return result;
1562
1563 /* Set the cooling mode [_SCP] to active cooling (default) */
1564 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1565 if (!result)
1566 tz->flags.cooling_mode = 1;
1567
1568 /* Get default polling frequency [_TZP] (optional) */
1569 if (tzp)
1570 tz->polling_frequency = tzp;
1571 else
1572 acpi_thermal_get_polling_frequency(tz);
1573
1574 return 0;
1575 }
1576
1577 static int acpi_thermal_add(struct acpi_device *device)
1578 {
1579 int result = 0;
1580 acpi_status status = AE_OK;
1581 struct acpi_thermal *tz = NULL;
1582
1583
1584 if (!device)
1585 return -EINVAL;
1586
1587 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1588 if (!tz)
1589 return -ENOMEM;
1590
1591 tz->device = device;
1592 strcpy(tz->name, device->pnp.bus_id);
1593 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1594 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1595 acpi_driver_data(device) = tz;
1596 mutex_init(&tz->lock);
1597
1598
1599 result = acpi_thermal_get_info(tz);
1600 if (result)
1601 goto free_memory;
1602
1603 result = acpi_thermal_register_thermal_zone(tz);
1604 if (result)
1605 goto free_memory;
1606
1607 result = acpi_thermal_add_fs(device);
1608 if (result)
1609 goto unregister_thermal_zone;
1610
1611 init_timer(&tz->timer);
1612
1613 acpi_thermal_check(tz);
1614
1615 status = acpi_install_notify_handler(device->handle,
1616 ACPI_DEVICE_NOTIFY,
1617 acpi_thermal_notify, tz);
1618 if (ACPI_FAILURE(status)) {
1619 result = -ENODEV;
1620 goto remove_fs;
1621 }
1622
1623 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1624 acpi_device_name(device), acpi_device_bid(device),
1625 KELVIN_TO_CELSIUS(tz->temperature));
1626 goto end;
1627
1628 remove_fs:
1629 acpi_thermal_remove_fs(device);
1630 unregister_thermal_zone:
1631 thermal_zone_device_unregister(tz->thermal_zone);
1632 free_memory:
1633 kfree(tz);
1634 end:
1635 return result;
1636 }
1637
1638 static int acpi_thermal_remove(struct acpi_device *device, int type)
1639 {
1640 acpi_status status = AE_OK;
1641 struct acpi_thermal *tz = NULL;
1642
1643
1644 if (!device || !acpi_driver_data(device))
1645 return -EINVAL;
1646
1647 tz = acpi_driver_data(device);
1648
1649 /* avoid timer adding new defer task */
1650 tz->zombie = 1;
1651 /* wait for running timer (on other CPUs) finish */
1652 del_timer_sync(&(tz->timer));
1653 /* synchronize deferred task */
1654 acpi_os_wait_events_complete(NULL);
1655 /* deferred task may reinsert timer */
1656 del_timer_sync(&(tz->timer));
1657
1658 status = acpi_remove_notify_handler(device->handle,
1659 ACPI_DEVICE_NOTIFY,
1660 acpi_thermal_notify);
1661
1662 /* Terminate policy */
1663 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1664 tz->trips.passive.flags.enabled = 0;
1665 acpi_thermal_passive(tz);
1666 }
1667 if (tz->trips.active[0].flags.valid
1668 && tz->trips.active[0].flags.enabled) {
1669 tz->trips.active[0].flags.enabled = 0;
1670 acpi_thermal_active(tz);
1671 }
1672
1673 acpi_thermal_remove_fs(device);
1674 acpi_thermal_unregister_thermal_zone(tz);
1675 mutex_destroy(&tz->lock);
1676 kfree(tz);
1677 return 0;
1678 }
1679
1680 static int acpi_thermal_resume(struct acpi_device *device)
1681 {
1682 struct acpi_thermal *tz = NULL;
1683 int i, j, power_state, result;
1684
1685
1686 if (!device || !acpi_driver_data(device))
1687 return -EINVAL;
1688
1689 tz = acpi_driver_data(device);
1690
1691 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1692 if (!(&tz->trips.active[i]))
1693 break;
1694 if (!tz->trips.active[i].flags.valid)
1695 break;
1696 tz->trips.active[i].flags.enabled = 1;
1697 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1698 result = acpi_bus_get_power(tz->trips.active[i].devices.
1699 handles[j], &power_state);
1700 if (result || (power_state != ACPI_STATE_D0)) {
1701 tz->trips.active[i].flags.enabled = 0;
1702 break;
1703 }
1704 }
1705 tz->state.active |= tz->trips.active[i].flags.enabled;
1706 }
1707
1708 acpi_thermal_check(tz);
1709
1710 return AE_OK;
1711 }
1712
1713 #ifdef CONFIG_DMI
1714 static int thermal_act(const struct dmi_system_id *d) {
1715
1716 if (act == 0) {
1717 printk(KERN_NOTICE "ACPI: %s detected: "
1718 "disabling all active thermal trip points\n", d->ident);
1719 act = -1;
1720 }
1721 return 0;
1722 }
1723 static int thermal_nocrt(const struct dmi_system_id *d) {
1724
1725 printk(KERN_NOTICE "ACPI: %s detected: "
1726 "disabling all critical thermal trip point actions.\n", d->ident);
1727 nocrt = 1;
1728 return 0;
1729 }
1730 static int thermal_tzp(const struct dmi_system_id *d) {
1731
1732 if (tzp == 0) {
1733 printk(KERN_NOTICE "ACPI: %s detected: "
1734 "enabling thermal zone polling\n", d->ident);
1735 tzp = 300; /* 300 dS = 30 Seconds */
1736 }
1737 return 0;
1738 }
1739 static int thermal_psv(const struct dmi_system_id *d) {
1740
1741 if (psv == 0) {
1742 printk(KERN_NOTICE "ACPI: %s detected: "
1743 "disabling all passive thermal trip points\n", d->ident);
1744 psv = -1;
1745 }
1746 return 0;
1747 }
1748
1749 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1750 /*
1751 * Award BIOS on this AOpen makes thermal control almost worthless.
1752 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1753 */
1754 {
1755 .callback = thermal_act,
1756 .ident = "AOpen i915GMm-HFS",
1757 .matches = {
1758 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1759 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1760 },
1761 },
1762 {
1763 .callback = thermal_psv,
1764 .ident = "AOpen i915GMm-HFS",
1765 .matches = {
1766 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1767 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1768 },
1769 },
1770 {
1771 .callback = thermal_tzp,
1772 .ident = "AOpen i915GMm-HFS",
1773 .matches = {
1774 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1775 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1776 },
1777 },
1778 {
1779 .callback = thermal_nocrt,
1780 .ident = "Gigabyte GA-7ZX",
1781 .matches = {
1782 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1783 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1784 },
1785 },
1786 {}
1787 };
1788 #endif /* CONFIG_DMI */
1789
1790 static int __init acpi_thermal_init(void)
1791 {
1792 int result = 0;
1793
1794 dmi_check_system(thermal_dmi_table);
1795
1796 if (off) {
1797 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1798 return -ENODEV;
1799 }
1800 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1801 if (!acpi_thermal_dir)
1802 return -ENODEV;
1803 acpi_thermal_dir->owner = THIS_MODULE;
1804
1805 result = acpi_bus_register_driver(&acpi_thermal_driver);
1806 if (result < 0) {
1807 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1808 return -ENODEV;
1809 }
1810
1811 return 0;
1812 }
1813
1814 static void __exit acpi_thermal_exit(void)
1815 {
1816
1817 acpi_bus_unregister_driver(&acpi_thermal_driver);
1818
1819 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1820
1821 return;
1822 }
1823
1824 module_init(acpi_thermal_init);
1825 module_exit(acpi_thermal_exit);
cpufreq for S3C2410