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[ARM] S3C: Fix scaler1 clock rate information
[linux-2.6/openmoko-kernel.git] / drivers / acpi / thermal.c
blobad6cae938f0b8cabfff04f305c577f0970bd1cb8
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 .owner = THIS_MODULE,
202 .open = acpi_thermal_state_open_fs,
203 .read = seq_read,
204 .llseek = seq_lseek,
205 .release = single_release,
206 };
207
208 static const struct file_operations acpi_thermal_temp_fops = {
209 .owner = THIS_MODULE,
210 .open = acpi_thermal_temp_open_fs,
211 .read = seq_read,
212 .llseek = seq_lseek,
213 .release = single_release,
214 };
215
216 static const struct file_operations acpi_thermal_trip_fops = {
217 .owner = THIS_MODULE,
218 .open = acpi_thermal_trip_open_fs,
219 .read = seq_read,
220 .llseek = seq_lseek,
221 .release = single_release,
222 };
223
224 static const struct file_operations acpi_thermal_cooling_fops = {
225 .owner = THIS_MODULE,
226 .open = acpi_thermal_cooling_open_fs,
227 .read = seq_read,
228 .write = acpi_thermal_write_cooling_mode,
229 .llseek = seq_lseek,
230 .release = single_release,
231 };
232
233 static const struct file_operations acpi_thermal_polling_fops = {
234 .owner = THIS_MODULE,
235 .open = acpi_thermal_polling_open_fs,
236 .read = seq_read,
237 .write = acpi_thermal_write_polling,
238 .llseek = seq_lseek,
239 .release = single_release,
240 };
241
242 /* --------------------------------------------------------------------------
243 Thermal Zone Management
244 -------------------------------------------------------------------------- */
245
246 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
247 {
248 acpi_status status = AE_OK;
249 unsigned long long tmp;
250
251 if (!tz)
252 return -EINVAL;
253
254 tz->last_temperature = tz->temperature;
255
256 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
257 if (ACPI_FAILURE(status))
258 return -ENODEV;
259
260 tz->temperature = tmp;
261 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
262 tz->temperature));
263
264 return 0;
265 }
266
267 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
268 {
269 acpi_status status = AE_OK;
270 unsigned long long tmp;
271
272 if (!tz)
273 return -EINVAL;
274
275 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
276 if (ACPI_FAILURE(status))
277 return -ENODEV;
278
279 tz->polling_frequency = tmp;
280 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
281 tz->polling_frequency));
282
283 return 0;
284 }
285
286 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
287 {
288
289 if (!tz)
290 return -EINVAL;
291
292 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */
293
294 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
295 "Polling frequency set to %lu seconds\n",
296 tz->polling_frequency/10));
297
298 return 0;
299 }
300
301 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
302 {
303 acpi_status status = AE_OK;
304 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
305 struct acpi_object_list arg_list = { 1, &arg0 };
306 acpi_handle handle = NULL;
307
308
309 if (!tz)
310 return -EINVAL;
311
312 status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
313 if (ACPI_FAILURE(status)) {
314 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
315 return -ENODEV;
316 }
317
318 arg0.integer.value = mode;
319
320 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
321 if (ACPI_FAILURE(status))
322 return -ENODEV;
323
324 return 0;
325 }
326
327 #define ACPI_TRIPS_CRITICAL 0x01
328 #define ACPI_TRIPS_HOT 0x02
329 #define ACPI_TRIPS_PASSIVE 0x04
330 #define ACPI_TRIPS_ACTIVE 0x08
331 #define ACPI_TRIPS_DEVICES 0x10
332
333 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
334 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
335
336 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
337 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
338 ACPI_TRIPS_DEVICES)
339
340 /*
341 * This exception is thrown out in two cases:
342 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
343 * when re-evaluating the AML code.
344 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
345 * We need to re-bind the cooling devices of a thermal zone when this occurs.
346 */
347 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
348 do { \
349 if (flags != ACPI_TRIPS_INIT) \
350 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
351 "ACPI thermal trip point %s changed\n" \
352 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
353 } while (0)
354
355 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
356 {
357 acpi_status status = AE_OK;
358 unsigned long long tmp;
359 struct acpi_handle_list devices;
360 int valid = 0;
361 int i;
362
363 /* Critical Shutdown (required) */
364 if (flag & ACPI_TRIPS_CRITICAL) {
365 status = acpi_evaluate_integer(tz->device->handle,
366 "_CRT", NULL, &tmp);
367 tz->trips.critical.temperature = tmp;
368 /*
369 * Treat freezing temperatures as invalid as well; some
370 * BIOSes return really low values and cause reboots at startup.
371 * Below zero (Celcius) values clearly aren't right for sure..
372 * ... so lets discard those as invalid.
373 */
374 if (ACPI_FAILURE(status) ||
375 tz->trips.critical.temperature <= 2732) {
376 tz->trips.critical.flags.valid = 0;
377 ACPI_EXCEPTION((AE_INFO, status,
378 "No or invalid critical threshold"));
379 return -ENODEV;
380 } else {
381 tz->trips.critical.flags.valid = 1;
382 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
383 "Found critical threshold [%lu]\n",
384 tz->trips.critical.temperature));
385 }
386 if (tz->trips.critical.flags.valid == 1) {
387 if (crt == -1) {
388 tz->trips.critical.flags.valid = 0;
389 } else if (crt > 0) {
390 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
391 /*
392 * Allow override critical threshold
393 */
394 if (crt_k > tz->trips.critical.temperature)
395 printk(KERN_WARNING PREFIX
396 "Critical threshold %d C\n", crt);
397 tz->trips.critical.temperature = crt_k;
398 }
399 }
400 }
401
402 /* Critical Sleep (optional) */
403 if (flag & ACPI_TRIPS_HOT) {
404 status = acpi_evaluate_integer(tz->device->handle,
405 "_HOT", NULL, &tmp);
406 if (ACPI_FAILURE(status)) {
407 tz->trips.hot.flags.valid = 0;
408 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
409 "No hot threshold\n"));
410 } else {
411 tz->trips.hot.temperature = tmp;
412 tz->trips.hot.flags.valid = 1;
413 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
414 "Found hot threshold [%lu]\n",
415 tz->trips.critical.temperature));
416 }
417 }
418
419 /* Passive (optional) */
420 if (flag & ACPI_TRIPS_PASSIVE) {
421 valid = tz->trips.passive.flags.valid;
422 if (psv == -1) {
423 status = AE_SUPPORT;
424 } else if (psv > 0) {
425 tmp = CELSIUS_TO_KELVIN(psv);
426 status = AE_OK;
427 } else {
428 status = acpi_evaluate_integer(tz->device->handle,
429 "_PSV", NULL, &tmp);
430 }
431
432 if (ACPI_FAILURE(status))
433 tz->trips.passive.flags.valid = 0;
434 else {
435 tz->trips.passive.temperature = tmp;
436 tz->trips.passive.flags.valid = 1;
437 if (flag == ACPI_TRIPS_INIT) {
438 status = acpi_evaluate_integer(
439 tz->device->handle, "_TC1",
440 NULL, &tmp);
441 if (ACPI_FAILURE(status))
442 tz->trips.passive.flags.valid = 0;
443 else
444 tz->trips.passive.tc1 = tmp;
445 status = acpi_evaluate_integer(
446 tz->device->handle, "_TC2",
447 NULL, &tmp);
448 if (ACPI_FAILURE(status))
449 tz->trips.passive.flags.valid = 0;
450 else
451 tz->trips.passive.tc2 = tmp;
452 status = acpi_evaluate_integer(
453 tz->device->handle, "_TSP",
454 NULL, &tmp);
455 if (ACPI_FAILURE(status))
456 tz->trips.passive.flags.valid = 0;
457 else
458 tz->trips.passive.tsp = tmp;
459 }
460 }
461 }
462 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
463 memset(&devices, 0, sizeof(struct acpi_handle_list));
464 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
465 NULL, &devices);
466 if (ACPI_FAILURE(status))
467 tz->trips.passive.flags.valid = 0;
468 else
469 tz->trips.passive.flags.valid = 1;
470
471 if (memcmp(&tz->trips.passive.devices, &devices,
472 sizeof(struct acpi_handle_list))) {
473 memcpy(&tz->trips.passive.devices, &devices,
474 sizeof(struct acpi_handle_list));
475 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
476 }
477 }
478 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
479 if (valid != tz->trips.passive.flags.valid)
480 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
481 }
482
483 /* Active (optional) */
484 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
485 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
486 valid = tz->trips.active[i].flags.valid;
487
488 if (act == -1)
489 break; /* disable all active trip points */
490
491 if (flag & ACPI_TRIPS_ACTIVE) {
492 status = acpi_evaluate_integer(tz->device->handle,
493 name, NULL, &tmp);
494 if (ACPI_FAILURE(status)) {
495 tz->trips.active[i].flags.valid = 0;
496 if (i == 0)
497 break;
498 if (act <= 0)
499 break;
500 if (i == 1)
501 tz->trips.active[0].temperature =
502 CELSIUS_TO_KELVIN(act);
503 else
504 /*
505 * Don't allow override higher than
506 * the next higher trip point
507 */
508 tz->trips.active[i - 1].temperature =
509 (tz->trips.active[i - 2].temperature <
510 CELSIUS_TO_KELVIN(act) ?
511 tz->trips.active[i - 2].temperature :
512 CELSIUS_TO_KELVIN(act));
513 break;
514 } else {
515 tz->trips.active[i].temperature = tmp;
516 tz->trips.active[i].flags.valid = 1;
517 }
518 }
519
520 name[2] = 'L';
521 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
522 memset(&devices, 0, sizeof(struct acpi_handle_list));
523 status = acpi_evaluate_reference(tz->device->handle,
524 name, NULL, &devices);
525 if (ACPI_FAILURE(status))
526 tz->trips.active[i].flags.valid = 0;
527 else
528 tz->trips.active[i].flags.valid = 1;
529
530 if (memcmp(&tz->trips.active[i].devices, &devices,
531 sizeof(struct acpi_handle_list))) {
532 memcpy(&tz->trips.active[i].devices, &devices,
533 sizeof(struct acpi_handle_list));
534 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
535 }
536 }
537 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
538 if (valid != tz->trips.active[i].flags.valid)
539 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
540
541 if (!tz->trips.active[i].flags.valid)
542 break;
543 }
544
545 if (flag & ACPI_TRIPS_DEVICES) {
546 memset(&devices, 0, sizeof(struct acpi_handle_list));
547 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
548 NULL, &devices);
549 if (memcmp(&tz->devices, &devices,
550 sizeof(struct acpi_handle_list))) {
551 memcpy(&tz->devices, &devices,
552 sizeof(struct acpi_handle_list));
553 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
554 }
555 }
556
557 return 0;
558 }
559
560 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
561 {
562 return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
563 }
564
565 static int acpi_thermal_critical(struct acpi_thermal *tz)
566 {
567 if (!tz || !tz->trips.critical.flags.valid)
568 return -EINVAL;
569
570 if (tz->temperature >= tz->trips.critical.temperature) {
571 printk(KERN_WARNING PREFIX "Critical trip point\n");
572 tz->trips.critical.flags.enabled = 1;
573 } else if (tz->trips.critical.flags.enabled)
574 tz->trips.critical.flags.enabled = 0;
575
576 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
577 tz->trips.critical.flags.enabled);
578 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
579 tz->device->dev.bus_id,
580 ACPI_THERMAL_NOTIFY_CRITICAL,
581 tz->trips.critical.flags.enabled);
582
583 /* take no action if nocrt is set */
584 if(!nocrt) {
585 printk(KERN_EMERG
586 "Critical temperature reached (%ld C), shutting down.\n",
587 KELVIN_TO_CELSIUS(tz->temperature));
588 orderly_poweroff(true);
589 }
590
591 return 0;
592 }
593
594 static int acpi_thermal_hot(struct acpi_thermal *tz)
595 {
596 if (!tz || !tz->trips.hot.flags.valid)
597 return -EINVAL;
598
599 if (tz->temperature >= tz->trips.hot.temperature) {
600 printk(KERN_WARNING PREFIX "Hot trip point\n");
601 tz->trips.hot.flags.enabled = 1;
602 } else if (tz->trips.hot.flags.enabled)
603 tz->trips.hot.flags.enabled = 0;
604
605 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
606 tz->trips.hot.flags.enabled);
607 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
608 tz->device->dev.bus_id,
609 ACPI_THERMAL_NOTIFY_HOT,
610 tz->trips.hot.flags.enabled);
611
612 /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
613
614 return 0;
615 }
616
617 static void acpi_thermal_passive(struct acpi_thermal *tz)
618 {
619 int result = 1;
620 struct acpi_thermal_passive *passive = NULL;
621 int trend = 0;
622 int i = 0;
623
624
625 if (!tz || !tz->trips.passive.flags.valid)
626 return;
627
628 passive = &(tz->trips.passive);
629
630 /*
631 * Above Trip?
632 * -----------
633 * Calculate the thermal trend (using the passive cooling equation)
634 * and modify the performance limit for all passive cooling devices
635 * accordingly. Note that we assume symmetry.
636 */
637 if (tz->temperature >= passive->temperature) {
638 trend =
639 (passive->tc1 * (tz->temperature - tz->last_temperature)) +
640 (passive->tc2 * (tz->temperature - passive->temperature));
641 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
642 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
643 trend, passive->tc1, tz->temperature,
644 tz->last_temperature, passive->tc2,
645 tz->temperature, passive->temperature));
646 passive->flags.enabled = 1;
647 /* Heating up? */
648 if (trend > 0)
649 for (i = 0; i < passive->devices.count; i++)
650 acpi_processor_set_thermal_limit(passive->
651 devices.
652 handles[i],
653 ACPI_PROCESSOR_LIMIT_INCREMENT);
654 /* Cooling off? */
655 else if (trend < 0) {
656 for (i = 0; i < passive->devices.count; i++)
657 /*
658 * assume that we are on highest
659 * freq/lowest thrott and can leave
660 * passive mode, even in error case
661 */
662 if (!acpi_processor_set_thermal_limit
663 (passive->devices.handles[i],
664 ACPI_PROCESSOR_LIMIT_DECREMENT))
665 result = 0;
666 /*
667 * Leave cooling mode, even if the temp might
668 * higher than trip point This is because some
669 * machines might have long thermal polling
670 * frequencies (tsp) defined. We will fall back
671 * into passive mode in next cycle (probably quicker)
672 */
673 if (result) {
674 passive->flags.enabled = 0;
675 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
676 "Disabling passive cooling, still above threshold,"
677 " but we are cooling down\n"));
678 }
679 }
680 return;
681 }
682
683 /*
684 * Below Trip?
685 * -----------
686 * Implement passive cooling hysteresis to slowly increase performance
687 * and avoid thrashing around the passive trip point. Note that we
688 * assume symmetry.
689 */
690 if (!passive->flags.enabled)
691 return;
692 for (i = 0; i < passive->devices.count; i++)
693 if (!acpi_processor_set_thermal_limit
694 (passive->devices.handles[i],
695 ACPI_PROCESSOR_LIMIT_DECREMENT))
696 result = 0;
697 if (result) {
698 passive->flags.enabled = 0;
699 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
700 "Disabling passive cooling (zone is cool)\n"));
701 }
702 }
703
704 static void acpi_thermal_active(struct acpi_thermal *tz)
705 {
706 int result = 0;
707 struct acpi_thermal_active *active = NULL;
708 int i = 0;
709 int j = 0;
710 unsigned long maxtemp = 0;
711
712
713 if (!tz)
714 return;
715
716 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
717 active = &(tz->trips.active[i]);
718 if (!active || !active->flags.valid)
719 break;
720 if (tz->temperature >= active->temperature) {
721 /*
722 * Above Threshold?
723 * ----------------
724 * If not already enabled, turn ON all cooling devices
725 * associated with this active threshold.
726 */
727 if (active->temperature > maxtemp)
728 tz->state.active_index = i;
729 maxtemp = active->temperature;
730 if (active->flags.enabled)
731 continue;
732 for (j = 0; j < active->devices.count; j++) {
733 result =
734 acpi_bus_set_power(active->devices.
735 handles[j],
736 ACPI_STATE_D0);
737 if (result) {
738 printk(KERN_WARNING PREFIX
739 "Unable to turn cooling device [%p] 'on'\n",
740 active->devices.
741 handles[j]);
742 continue;
743 }
744 active->flags.enabled = 1;
745 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
746 "Cooling device [%p] now 'on'\n",
747 active->devices.handles[j]));
748 }
749 continue;
750 }
751 if (!active->flags.enabled)
752 continue;
753 /*
754 * Below Threshold?
755 * ----------------
756 * Turn OFF all cooling devices associated with this
757 * threshold.
758 */
759 for (j = 0; j < active->devices.count; j++) {
760 result = acpi_bus_set_power(active->devices.handles[j],
761 ACPI_STATE_D3);
762 if (result) {
763 printk(KERN_WARNING PREFIX
764 "Unable to turn cooling device [%p] 'off'\n",
765 active->devices.handles[j]);
766 continue;
767 }
768 active->flags.enabled = 0;
769 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
770 "Cooling device [%p] now 'off'\n",
771 active->devices.handles[j]));
772 }
773 }
774 }
775
776 static void acpi_thermal_check(void *context);
777
778 static void acpi_thermal_run(unsigned long data)
779 {
780 struct acpi_thermal *tz = (struct acpi_thermal *)data;
781 if (!tz->zombie)
782 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
783 }
784
785 static void acpi_thermal_active_off(void *data)
786 {
787 int result = 0;
788 struct acpi_thermal *tz = data;
789 int i = 0;
790 int j = 0;
791 struct acpi_thermal_active *active = NULL;
792
793 if (!tz) {
794 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
795 return;
796 }
797
798 result = acpi_thermal_get_temperature(tz);
799 if (result)
800 return;
801
802 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
803 active = &(tz->trips.active[i]);
804 if (!active || !active->flags.valid)
805 break;
806 if (tz->temperature >= active->temperature) {
807 /*
808 * If the thermal temperature is greater than the
809 * active threshod, unnecessary to turn off the
810 * the active cooling device.
811 */
812 continue;
813 }
814 /*
815 * Below Threshold?
816 * ----------------
817 * Turn OFF all cooling devices associated with this
818 * threshold.
819 */
820 for (j = 0; j < active->devices.count; j++)
821 result = acpi_bus_set_power(active->devices.handles[j],
822 ACPI_STATE_D3);
823 }
824 }
825
826 static void acpi_thermal_check(void *data)
827 {
828 int result = 0;
829 struct acpi_thermal *tz = data;
830 unsigned long sleep_time = 0;
831 unsigned long timeout_jiffies = 0;
832 int i = 0;
833 struct acpi_thermal_state state;
834
835
836 if (!tz) {
837 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
838 return;
839 }
840
841 /* Check if someone else is already running */
842 if (!mutex_trylock(&tz->lock))
843 return;
844
845 state = tz->state;
846
847 result = acpi_thermal_get_temperature(tz);
848 if (result)
849 goto unlock;
850
851 if (!tz->tz_enabled)
852 goto unlock;
853
854 memset(&tz->state, 0, sizeof(tz->state));
855
856 /*
857 * Check Trip Points
858 * -----------------
859 * Compare the current temperature to the trip point values to see
860 * if we've entered one of the thermal policy states. Note that
861 * this function determines when a state is entered, but the
862 * individual policy decides when it is exited (e.g. hysteresis).
863 */
864 if (tz->trips.critical.flags.valid)
865 state.critical |=
866 (tz->temperature >= tz->trips.critical.temperature);
867 if (tz->trips.hot.flags.valid)
868 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
869 if (tz->trips.passive.flags.valid)
870 state.passive |=
871 (tz->temperature >= tz->trips.passive.temperature);
872 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
873 if (tz->trips.active[i].flags.valid)
874 state.active |=
875 (tz->temperature >=
876 tz->trips.active[i].temperature);
877
878 /*
879 * Invoke Policy
880 * -------------
881 * Separated from the above check to allow individual policy to
882 * determine when to exit a given state.
883 */
884 if (state.critical)
885 acpi_thermal_critical(tz);
886 if (state.hot)
887 acpi_thermal_hot(tz);
888 if (state.passive)
889 acpi_thermal_passive(tz);
890 if (state.active)
891 acpi_thermal_active(tz);
892
893 /*
894 * Calculate State
895 * ---------------
896 * Again, separated from the above two to allow independent policy
897 * decisions.
898 */
899 tz->state.critical = tz->trips.critical.flags.enabled;
900 tz->state.hot = tz->trips.hot.flags.enabled;
901 tz->state.passive = tz->trips.passive.flags.enabled;
902 tz->state.active = 0;
903 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
904 tz->state.active |= tz->trips.active[i].flags.enabled;
905
906 /*
907 * Calculate Sleep Time
908 * --------------------
909 * If we're in the passive state, use _TSP's value. Otherwise
910 * use the default polling frequency (e.g. _TZP). If no polling
911 * frequency is specified then we'll wait forever (at least until
912 * a thermal event occurs). Note that _TSP and _TZD values are
913 * given in 1/10th seconds (we must covert to milliseconds).
914 */
915 if (tz->state.passive) {
916 sleep_time = tz->trips.passive.tsp * 100;
917 timeout_jiffies = jiffies + (HZ * sleep_time) / 1000;
918 } else if (tz->polling_frequency > 0) {
919 sleep_time = tz->polling_frequency * 100;
920 timeout_jiffies = round_jiffies(jiffies + (HZ * sleep_time) / 1000);
921 }
922
923 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
924 tz->name, tz->temperature, sleep_time));
925
926 /*
927 * Schedule Next Poll
928 * ------------------
929 */
930 if (!sleep_time) {
931 if (timer_pending(&(tz->timer)))
932 del_timer(&(tz->timer));
933 } else {
934 if (timer_pending(&(tz->timer)))
935 mod_timer(&(tz->timer), timeout_jiffies);
936 else {
937 tz->timer.data = (unsigned long)tz;
938 tz->timer.function = acpi_thermal_run;
939 tz->timer.expires = timeout_jiffies;
940 add_timer(&(tz->timer));
941 }
942 }
943 unlock:
944 mutex_unlock(&tz->lock);
945 }
946
947 /* sys I/F for generic thermal sysfs support */
948 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
949
950 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
951 {
952 struct acpi_thermal *tz = thermal->devdata;
953 int result;
954
955 if (!tz)
956 return -EINVAL;
957
958 result = acpi_thermal_get_temperature(tz);
959 if (result)
960 return result;
961
962 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature));
963 }
964
965 static const char enabled[] = "kernel";
966 static const char disabled[] = "user";
967 static int thermal_get_mode(struct thermal_zone_device *thermal,
968 char *buf)
969 {
970 struct acpi_thermal *tz = thermal->devdata;
971
972 if (!tz)
973 return -EINVAL;
974
975 return sprintf(buf, "%s\n", tz->tz_enabled ?
976 enabled : disabled);
977 }
978
979 static int thermal_set_mode(struct thermal_zone_device *thermal,
980 const char *buf)
981 {
982 struct acpi_thermal *tz = thermal->devdata;
983 int enable;
984
985 if (!tz)
986 return -EINVAL;
987
988 /*
989 * enable/disable thermal management from ACPI thermal driver
990 */
991 if (!strncmp(buf, enabled, sizeof enabled - 1))
992 enable = 1;
993 else if (!strncmp(buf, disabled, sizeof disabled - 1))
994 enable = 0;
995 else
996 return -EINVAL;
997
998 if (enable != tz->tz_enabled) {
999 tz->tz_enabled = enable;
1000 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1001 "%s ACPI thermal control\n",
1002 tz->tz_enabled ? enabled : disabled));
1003 acpi_thermal_check(tz);
1004 }
1005 return 0;
1006 }
1007
1008 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
1009 int trip, char *buf)
1010 {
1011 struct acpi_thermal *tz = thermal->devdata;
1012 int i;
1013
1014 if (!tz || trip < 0)
1015 return -EINVAL;
1016
1017 if (tz->trips.critical.flags.valid) {
1018 if (!trip)
1019 return sprintf(buf, "critical\n");
1020 trip--;
1021 }
1022
1023 if (tz->trips.hot.flags.valid) {
1024 if (!trip)
1025 return sprintf(buf, "hot\n");
1026 trip--;
1027 }
1028
1029 if (tz->trips.passive.flags.valid) {
1030 if (!trip)
1031 return sprintf(buf, "passive\n");
1032 trip--;
1033 }
1034
1035 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1036 tz->trips.active[i].flags.valid; i++) {
1037 if (!trip)
1038 return sprintf(buf, "active%d\n", i);
1039 trip--;
1040 }
1041
1042 return -EINVAL;
1043 }
1044
1045 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
1046 int trip, char *buf)
1047 {
1048 struct acpi_thermal *tz = thermal->devdata;
1049 int i;
1050
1051 if (!tz || trip < 0)
1052 return -EINVAL;
1053
1054 if (tz->trips.critical.flags.valid) {
1055 if (!trip)
1056 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1057 tz->trips.critical.temperature));
1058 trip--;
1059 }
1060
1061 if (tz->trips.hot.flags.valid) {
1062 if (!trip)
1063 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1064 tz->trips.hot.temperature));
1065 trip--;
1066 }
1067
1068 if (tz->trips.passive.flags.valid) {
1069 if (!trip)
1070 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1071 tz->trips.passive.temperature));
1072 trip--;
1073 }
1074
1075 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1076 tz->trips.active[i].flags.valid; i++) {
1077 if (!trip)
1078 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1079 tz->trips.active[i].temperature));
1080 trip--;
1081 }
1082
1083 return -EINVAL;
1084 }
1085
1086 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
1087 unsigned long *temperature) {
1088 struct acpi_thermal *tz = thermal->devdata;
1089
1090 if (tz->trips.critical.flags.valid) {
1091 *temperature = KELVIN_TO_MILLICELSIUS(
1092 tz->trips.critical.temperature);
1093 return 0;
1094 } else
1095 return -EINVAL;
1096 }
1097
1098 typedef int (*cb)(struct thermal_zone_device *, int,
1099 struct thermal_cooling_device *);
1100 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
1101 struct thermal_cooling_device *cdev,
1102 cb action)
1103 {
1104 struct acpi_device *device = cdev->devdata;
1105 struct acpi_thermal *tz = thermal->devdata;
1106 struct acpi_device *dev;
1107 acpi_status status;
1108 acpi_handle handle;
1109 int i;
1110 int j;
1111 int trip = -1;
1112 int result = 0;
1113
1114 if (tz->trips.critical.flags.valid)
1115 trip++;
1116
1117 if (tz->trips.hot.flags.valid)
1118 trip++;
1119
1120 if (tz->trips.passive.flags.valid) {
1121 trip++;
1122 for (i = 0; i < tz->trips.passive.devices.count;
1123 i++) {
1124 handle = tz->trips.passive.devices.handles[i];
1125 status = acpi_bus_get_device(handle, &dev);
1126 if (ACPI_SUCCESS(status) && (dev == device)) {
1127 result = action(thermal, trip, cdev);
1128 if (result)
1129 goto failed;
1130 }
1131 }
1132 }
1133
1134 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1135 if (!tz->trips.active[i].flags.valid)
1136 break;
1137 trip++;
1138 for (j = 0;
1139 j < tz->trips.active[i].devices.count;
1140 j++) {
1141 handle = tz->trips.active[i].devices.handles[j];
1142 status = acpi_bus_get_device(handle, &dev);
1143 if (ACPI_SUCCESS(status) && (dev == device)) {
1144 result = action(thermal, trip, cdev);
1145 if (result)
1146 goto failed;
1147 }
1148 }
1149 }
1150
1151 for (i = 0; i < tz->devices.count; i++) {
1152 handle = tz->devices.handles[i];
1153 status = acpi_bus_get_device(handle, &dev);
1154 if (ACPI_SUCCESS(status) && (dev == device)) {
1155 result = action(thermal, -1, cdev);
1156 if (result)
1157 goto failed;
1158 }
1159 }
1160
1161 failed:
1162 return result;
1163 }
1164
1165 static int
1166 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1167 struct thermal_cooling_device *cdev)
1168 {
1169 return acpi_thermal_cooling_device_cb(thermal, cdev,
1170 thermal_zone_bind_cooling_device);
1171 }
1172
1173 static int
1174 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
1175 struct thermal_cooling_device *cdev)
1176 {
1177 return acpi_thermal_cooling_device_cb(thermal, cdev,
1178 thermal_zone_unbind_cooling_device);
1179 }
1180
1181 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1182 .bind = acpi_thermal_bind_cooling_device,
1183 .unbind = acpi_thermal_unbind_cooling_device,
1184 .get_temp = thermal_get_temp,
1185 .get_mode = thermal_get_mode,
1186 .set_mode = thermal_set_mode,
1187 .get_trip_type = thermal_get_trip_type,
1188 .get_trip_temp = thermal_get_trip_temp,
1189 .get_crit_temp = thermal_get_crit_temp,
1190 };
1191
1192 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1193 {
1194 int trips = 0;
1195 int result;
1196 acpi_status status;
1197 int i;
1198
1199 if (tz->trips.critical.flags.valid)
1200 trips++;
1201
1202 if (tz->trips.hot.flags.valid)
1203 trips++;
1204
1205 if (tz->trips.passive.flags.valid)
1206 trips++;
1207
1208 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1209 tz->trips.active[i].flags.valid; i++, trips++);
1210 tz->thermal_zone = thermal_zone_device_register("acpitz",
1211 trips, tz, &acpi_thermal_zone_ops);
1212 if (IS_ERR(tz->thermal_zone))
1213 return -ENODEV;
1214
1215 result = sysfs_create_link(&tz->device->dev.kobj,
1216 &tz->thermal_zone->device.kobj, "thermal_zone");
1217 if (result)
1218 return result;
1219
1220 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1221 &tz->device->dev.kobj, "device");
1222 if (result)
1223 return result;
1224
1225 status = acpi_attach_data(tz->device->handle,
1226 acpi_bus_private_data_handler,
1227 tz->thermal_zone);
1228 if (ACPI_FAILURE(status)) {
1229 printk(KERN_ERR PREFIX
1230 "Error attaching device data\n");
1231 return -ENODEV;
1232 }
1233
1234 tz->tz_enabled = 1;
1235
1236 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
1237 tz->thermal_zone->id);
1238 return 0;
1239 }
1240
1241 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1242 {
1243 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1244 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1245 thermal_zone_device_unregister(tz->thermal_zone);
1246 tz->thermal_zone = NULL;
1247 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
1248 }
1249
1250
1251 /* --------------------------------------------------------------------------
1252 FS Interface (/proc)
1253 -------------------------------------------------------------------------- */
1254
1255 static struct proc_dir_entry *acpi_thermal_dir;
1256
1257 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1258 {
1259 struct acpi_thermal *tz = seq->private;
1260
1261
1262 if (!tz)
1263 goto end;
1264
1265 seq_puts(seq, "state: ");
1266
1267 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1268 && !tz->state.active)
1269 seq_puts(seq, "ok\n");
1270 else {
1271 if (tz->state.critical)
1272 seq_puts(seq, "critical ");
1273 if (tz->state.hot)
1274 seq_puts(seq, "hot ");
1275 if (tz->state.passive)
1276 seq_puts(seq, "passive ");
1277 if (tz->state.active)
1278 seq_printf(seq, "active[%d]", tz->state.active_index);
1279 seq_puts(seq, "\n");
1280 }
1281
1282 end:
1283 return 0;
1284 }
1285
1286 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1287 {
1288 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1289 }
1290
1291 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1292 {
1293 int result = 0;
1294 struct acpi_thermal *tz = seq->private;
1295
1296
1297 if (!tz)
1298 goto end;
1299
1300 result = acpi_thermal_get_temperature(tz);
1301 if (result)
1302 goto end;
1303
1304 seq_printf(seq, "temperature: %ld C\n",
1305 KELVIN_TO_CELSIUS(tz->temperature));
1306
1307 end:
1308 return 0;
1309 }
1310
1311 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1312 {
1313 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1314 }
1315
1316 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1317 {
1318 struct acpi_thermal *tz = seq->private;
1319 struct acpi_device *device;
1320 acpi_status status;
1321
1322 int i = 0;
1323 int j = 0;
1324
1325
1326 if (!tz)
1327 goto end;
1328
1329 if (tz->trips.critical.flags.valid)
1330 seq_printf(seq, "critical (S5): %ld C%s",
1331 KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1332 nocrt ? " <disabled>\n" : "\n");
1333
1334 if (tz->trips.hot.flags.valid)
1335 seq_printf(seq, "hot (S4): %ld C%s",
1336 KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1337 nocrt ? " <disabled>\n" : "\n");
1338
1339 if (tz->trips.passive.flags.valid) {
1340 seq_printf(seq,
1341 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1342 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1343 tz->trips.passive.tc1, tz->trips.passive.tc2,
1344 tz->trips.passive.tsp);
1345 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1346 status = acpi_bus_get_device(tz->trips.passive.devices.
1347 handles[j], &device);
1348 seq_printf(seq, "%4.4s ", status ? "" :
1349 acpi_device_bid(device));
1350 }
1351 seq_puts(seq, "\n");
1352 }
1353
1354 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1355 if (!(tz->trips.active[i].flags.valid))
1356 break;
1357 seq_printf(seq, "active[%d]: %ld C: devices=",
1358 i,
1359 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1360 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1361 status = acpi_bus_get_device(tz->trips.active[i].
1362 devices.handles[j],
1363 &device);
1364 seq_printf(seq, "%4.4s ", status ? "" :
1365 acpi_device_bid(device));
1366 }
1367 seq_puts(seq, "\n");
1368 }
1369
1370 end:
1371 return 0;
1372 }
1373
1374 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1375 {
1376 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1377 }
1378
1379 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1380 {
1381 struct acpi_thermal *tz = seq->private;
1382
1383
1384 if (!tz)
1385 goto end;
1386
1387 if (!tz->flags.cooling_mode)
1388 seq_puts(seq, "<setting not supported>\n");
1389 else
1390 seq_puts(seq, "0 - Active; 1 - Passive\n");
1391
1392 end:
1393 return 0;
1394 }
1395
1396 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1397 {
1398 return single_open(file, acpi_thermal_cooling_seq_show,
1399 PDE(inode)->data);
1400 }
1401
1402 static ssize_t
1403 acpi_thermal_write_cooling_mode(struct file *file,
1404 const char __user * buffer,
1405 size_t count, loff_t * ppos)
1406 {
1407 struct seq_file *m = file->private_data;
1408 struct acpi_thermal *tz = m->private;
1409 int result = 0;
1410 char mode_string[12] = { '\0' };
1411
1412
1413 if (!tz || (count > sizeof(mode_string) - 1))
1414 return -EINVAL;
1415
1416 if (!tz->flags.cooling_mode)
1417 return -ENODEV;
1418
1419 if (copy_from_user(mode_string, buffer, count))
1420 return -EFAULT;
1421
1422 mode_string[count] = '\0';
1423
1424 result = acpi_thermal_set_cooling_mode(tz,
1425 simple_strtoul(mode_string, NULL,
1426 0));
1427 if (result)
1428 return result;
1429
1430 acpi_thermal_check(tz);
1431
1432 return count;
1433 }
1434
1435 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1436 {
1437 struct acpi_thermal *tz = seq->private;
1438
1439
1440 if (!tz)
1441 goto end;
1442
1443 if (!tz->polling_frequency) {
1444 seq_puts(seq, "<polling disabled>\n");
1445 goto end;
1446 }
1447
1448 seq_printf(seq, "polling frequency: %lu seconds\n",
1449 (tz->polling_frequency / 10));
1450
1451 end:
1452 return 0;
1453 }
1454
1455 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1456 {
1457 return single_open(file, acpi_thermal_polling_seq_show,
1458 PDE(inode)->data);
1459 }
1460
1461 static ssize_t
1462 acpi_thermal_write_polling(struct file *file,
1463 const char __user * buffer,
1464 size_t count, loff_t * ppos)
1465 {
1466 struct seq_file *m = file->private_data;
1467 struct acpi_thermal *tz = m->private;
1468 int result = 0;
1469 char polling_string[12] = { '\0' };
1470 int seconds = 0;
1471
1472
1473 if (!tz || (count > sizeof(polling_string) - 1))
1474 return -EINVAL;
1475
1476 if (copy_from_user(polling_string, buffer, count))
1477 return -EFAULT;
1478
1479 polling_string[count] = '\0';
1480
1481 seconds = simple_strtoul(polling_string, NULL, 0);
1482
1483 result = acpi_thermal_set_polling(tz, seconds);
1484 if (result)
1485 return result;
1486
1487 acpi_thermal_check(tz);
1488
1489 return count;
1490 }
1491
1492 static int acpi_thermal_add_fs(struct acpi_device *device)
1493 {
1494 struct proc_dir_entry *entry = NULL;
1495
1496
1497 if (!acpi_device_dir(device)) {
1498 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1499 acpi_thermal_dir);
1500 if (!acpi_device_dir(device))
1501 return -ENODEV;
1502 acpi_device_dir(device)->owner = THIS_MODULE;
1503 }
1504
1505 /* 'state' [R] */
1506 entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1507 S_IRUGO, acpi_device_dir(device),
1508 &acpi_thermal_state_fops,
1509 acpi_driver_data(device));
1510 if (!entry)
1511 return -ENODEV;
1512
1513 /* 'temperature' [R] */
1514 entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1515 S_IRUGO, acpi_device_dir(device),
1516 &acpi_thermal_temp_fops,
1517 acpi_driver_data(device));
1518 if (!entry)
1519 return -ENODEV;
1520
1521 /* 'trip_points' [R] */
1522 entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1523 S_IRUGO,
1524 acpi_device_dir(device),
1525 &acpi_thermal_trip_fops,
1526 acpi_driver_data(device));
1527 if (!entry)
1528 return -ENODEV;
1529
1530 /* 'cooling_mode' [R/W] */
1531 entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1532 S_IFREG | S_IRUGO | S_IWUSR,
1533 acpi_device_dir(device),
1534 &acpi_thermal_cooling_fops,
1535 acpi_driver_data(device));
1536 if (!entry)
1537 return -ENODEV;
1538
1539 /* 'polling_frequency' [R/W] */
1540 entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1541 S_IFREG | S_IRUGO | S_IWUSR,
1542 acpi_device_dir(device),
1543 &acpi_thermal_polling_fops,
1544 acpi_driver_data(device));
1545 if (!entry)
1546 return -ENODEV;
1547 return 0;
1548 }
1549
1550 static int acpi_thermal_remove_fs(struct acpi_device *device)
1551 {
1552
1553 if (acpi_device_dir(device)) {
1554 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1555 acpi_device_dir(device));
1556 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1557 acpi_device_dir(device));
1558 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1559 acpi_device_dir(device));
1560 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1561 acpi_device_dir(device));
1562 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1563 acpi_device_dir(device));
1564 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1565 acpi_device_dir(device) = NULL;
1566 }
1567
1568 return 0;
1569 }
1570
1571 /* --------------------------------------------------------------------------
1572 Driver Interface
1573 -------------------------------------------------------------------------- */
1574
1575 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1576 {
1577 struct acpi_thermal *tz = data;
1578 struct acpi_device *device = NULL;
1579
1580
1581 if (!tz)
1582 return;
1583
1584 device = tz->device;
1585
1586 switch (event) {
1587 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1588 acpi_thermal_check(tz);
1589 break;
1590 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1591 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1592 acpi_thermal_check(tz);
1593 acpi_bus_generate_proc_event(device, event, 0);
1594 acpi_bus_generate_netlink_event(device->pnp.device_class,
1595 device->dev.bus_id, event, 0);
1596 break;
1597 case ACPI_THERMAL_NOTIFY_DEVICES:
1598 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1599 acpi_thermal_check(tz);
1600 acpi_bus_generate_proc_event(device, event, 0);
1601 acpi_bus_generate_netlink_event(device->pnp.device_class,
1602 device->dev.bus_id, event, 0);
1603 break;
1604 default:
1605 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1606 "Unsupported event [0x%x]\n", event));
1607 break;
1608 }
1609
1610 return;
1611 }
1612
1613 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1614 {
1615 int result = 0;
1616
1617
1618 if (!tz)
1619 return -EINVAL;
1620
1621 /* Get temperature [_TMP] (required) */
1622 result = acpi_thermal_get_temperature(tz);
1623 if (result)
1624 return result;
1625
1626 /* Get trip points [_CRT, _PSV, etc.] (required) */
1627 result = acpi_thermal_get_trip_points(tz);
1628 if (result)
1629 return result;
1630
1631 /* Set the cooling mode [_SCP] to active cooling (default) */
1632 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1633 if (!result)
1634 tz->flags.cooling_mode = 1;
1635
1636 /* Get default polling frequency [_TZP] (optional) */
1637 if (tzp)
1638 tz->polling_frequency = tzp;
1639 else
1640 acpi_thermal_get_polling_frequency(tz);
1641
1642 return 0;
1643 }
1644
1645 static int acpi_thermal_add(struct acpi_device *device)
1646 {
1647 int result = 0;
1648 acpi_status status = AE_OK;
1649 struct acpi_thermal *tz = NULL;
1650
1651
1652 if (!device)
1653 return -EINVAL;
1654
1655 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1656 if (!tz)
1657 return -ENOMEM;
1658
1659 tz->device = device;
1660 strcpy(tz->name, device->pnp.bus_id);
1661 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1662 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1663 device->driver_data = tz;
1664 mutex_init(&tz->lock);
1665
1666
1667 result = acpi_thermal_get_info(tz);
1668 if (result)
1669 goto free_memory;
1670
1671 result = acpi_thermal_register_thermal_zone(tz);
1672 if (result)
1673 goto free_memory;
1674
1675 result = acpi_thermal_add_fs(device);
1676 if (result)
1677 goto unregister_thermal_zone;
1678
1679 init_timer(&tz->timer);
1680
1681 acpi_thermal_active_off(tz);
1682
1683 acpi_thermal_check(tz);
1684
1685 status = acpi_install_notify_handler(device->handle,
1686 ACPI_DEVICE_NOTIFY,
1687 acpi_thermal_notify, tz);
1688 if (ACPI_FAILURE(status)) {
1689 result = -ENODEV;
1690 goto remove_fs;
1691 }
1692
1693 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1694 acpi_device_name(device), acpi_device_bid(device),
1695 KELVIN_TO_CELSIUS(tz->temperature));
1696 goto end;
1697
1698 remove_fs:
1699 acpi_thermal_remove_fs(device);
1700 unregister_thermal_zone:
1701 thermal_zone_device_unregister(tz->thermal_zone);
1702 free_memory:
1703 kfree(tz);
1704 end:
1705 return result;
1706 }
1707
1708 static int acpi_thermal_remove(struct acpi_device *device, int type)
1709 {
1710 acpi_status status = AE_OK;
1711 struct acpi_thermal *tz = NULL;
1712
1713
1714 if (!device || !acpi_driver_data(device))
1715 return -EINVAL;
1716
1717 tz = acpi_driver_data(device);
1718
1719 /* avoid timer adding new defer task */
1720 tz->zombie = 1;
1721 /* wait for running timer (on other CPUs) finish */
1722 del_timer_sync(&(tz->timer));
1723 /* synchronize deferred task */
1724 acpi_os_wait_events_complete(NULL);
1725 /* deferred task may reinsert timer */
1726 del_timer_sync(&(tz->timer));
1727
1728 status = acpi_remove_notify_handler(device->handle,
1729 ACPI_DEVICE_NOTIFY,
1730 acpi_thermal_notify);
1731
1732 /* Terminate policy */
1733 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1734 tz->trips.passive.flags.enabled = 0;
1735 acpi_thermal_passive(tz);
1736 }
1737 if (tz->trips.active[0].flags.valid
1738 && tz->trips.active[0].flags.enabled) {
1739 tz->trips.active[0].flags.enabled = 0;
1740 acpi_thermal_active(tz);
1741 }
1742
1743 acpi_thermal_remove_fs(device);
1744 acpi_thermal_unregister_thermal_zone(tz);
1745 mutex_destroy(&tz->lock);
1746 kfree(tz);
1747 return 0;
1748 }
1749
1750 static int acpi_thermal_resume(struct acpi_device *device)
1751 {
1752 struct acpi_thermal *tz = NULL;
1753 int i, j, power_state, result;
1754
1755
1756 if (!device || !acpi_driver_data(device))
1757 return -EINVAL;
1758
1759 tz = acpi_driver_data(device);
1760
1761 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1762 if (!(&tz->trips.active[i]))
1763 break;
1764 if (!tz->trips.active[i].flags.valid)
1765 break;
1766 tz->trips.active[i].flags.enabled = 1;
1767 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1768 result = acpi_bus_get_power(tz->trips.active[i].devices.
1769 handles[j], &power_state);
1770 if (result || (power_state != ACPI_STATE_D0)) {
1771 tz->trips.active[i].flags.enabled = 0;
1772 break;
1773 }
1774 }
1775 tz->state.active |= tz->trips.active[i].flags.enabled;
1776 }
1777
1778 acpi_thermal_check(tz);
1779
1780 return AE_OK;
1781 }
1782
1783 static int thermal_act(const struct dmi_system_id *d) {
1784
1785 if (act == 0) {
1786 printk(KERN_NOTICE "ACPI: %s detected: "
1787 "disabling all active thermal trip points\n", d->ident);
1788 act = -1;
1789 }
1790 return 0;
1791 }
1792 static int thermal_nocrt(const struct dmi_system_id *d) {
1793
1794 printk(KERN_NOTICE "ACPI: %s detected: "
1795 "disabling all critical thermal trip point actions.\n", d->ident);
1796 nocrt = 1;
1797 return 0;
1798 }
1799 static int thermal_tzp(const struct dmi_system_id *d) {
1800
1801 if (tzp == 0) {
1802 printk(KERN_NOTICE "ACPI: %s detected: "
1803 "enabling thermal zone polling\n", d->ident);
1804 tzp = 300; /* 300 dS = 30 Seconds */
1805 }
1806 return 0;
1807 }
1808 static int thermal_psv(const struct dmi_system_id *d) {
1809
1810 if (psv == 0) {
1811 printk(KERN_NOTICE "ACPI: %s detected: "
1812 "disabling all passive thermal trip points\n", d->ident);
1813 psv = -1;
1814 }
1815 return 0;
1816 }
1817
1818 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1819 /*
1820 * Award BIOS on this AOpen makes thermal control almost worthless.
1821 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1822 */
1823 {
1824 .callback = thermal_act,
1825 .ident = "AOpen i915GMm-HFS",
1826 .matches = {
1827 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1828 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1829 },
1830 },
1831 {
1832 .callback = thermal_psv,
1833 .ident = "AOpen i915GMm-HFS",
1834 .matches = {
1835 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1836 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1837 },
1838 },
1839 {
1840 .callback = thermal_tzp,
1841 .ident = "AOpen i915GMm-HFS",
1842 .matches = {
1843 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1844 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1845 },
1846 },
1847 {
1848 .callback = thermal_nocrt,
1849 .ident = "Gigabyte GA-7ZX",
1850 .matches = {
1851 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1852 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1853 },
1854 },
1855 {}
1856 };
1857
1858 static int __init acpi_thermal_init(void)
1859 {
1860 int result = 0;
1861
1862 dmi_check_system(thermal_dmi_table);
1863
1864 if (off) {
1865 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1866 return -ENODEV;
1867 }
1868 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1869 if (!acpi_thermal_dir)
1870 return -ENODEV;
1871 acpi_thermal_dir->owner = THIS_MODULE;
1872
1873 result = acpi_bus_register_driver(&acpi_thermal_driver);
1874 if (result < 0) {
1875 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1876 return -ENODEV;
1877 }
1878
1879 return 0;
1880 }
1881
1882 static void __exit acpi_thermal_exit(void)
1883 {
1884
1885 acpi_bus_unregister_driver(&acpi_thermal_driver);
1886
1887 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1888
1889 return;
1890 }
1891
1892 module_init(acpi_thermal_init);
1893 module_exit(acpi_thermal_exit);
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