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ACPI thermal: Check for thermal zone requirement
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / acpi / thermal.c
blobe9f28e075cf86d4828bbd3901004318a90a8d110
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/jiffies.h>
41 #include <linux/kmod.h>
42 #include <linux/seq_file.h>
43 #include <linux/reboot.h>
44 #include <linux/device.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 PREFIX "ACPI: "
51
52 #define ACPI_THERMAL_CLASS "thermal_zone"
53 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
54 #define ACPI_THERMAL_FILE_STATE "state"
55 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
56 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
57 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
58 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
59 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
60 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
61 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82
62 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
63 #define ACPI_THERMAL_NOTIFY_HOT 0xF1
64 #define ACPI_THERMAL_MODE_ACTIVE 0x00
65
66 #define ACPI_THERMAL_MAX_ACTIVE 10
67 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
68
69 #define _COMPONENT ACPI_THERMAL_COMPONENT
70 ACPI_MODULE_NAME("thermal");
71
72 MODULE_AUTHOR("Paul Diefenbaugh");
73 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
74 MODULE_LICENSE("GPL");
75
76 static int act;
77 module_param(act, int, 0644);
78 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
79
80 static int crt;
81 module_param(crt, int, 0644);
82 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
83
84 static int tzp;
85 module_param(tzp, int, 0444);
86 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
87
88 static int nocrt;
89 module_param(nocrt, int, 0);
90 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
91
92 static int off;
93 module_param(off, int, 0);
94 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
95
96 static int psv;
97 module_param(psv, int, 0644);
98 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
99
100 static int acpi_thermal_add(struct acpi_device *device);
101 static int acpi_thermal_remove(struct acpi_device *device, int type);
102 static int acpi_thermal_resume(struct acpi_device *device);
103 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
104 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
105 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
106 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
107 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
108 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
109 const char __user *, size_t,
110 loff_t *);
111 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
112 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
113 size_t, loff_t *);
114
115 static const struct acpi_device_id thermal_device_ids[] = {
116 {ACPI_THERMAL_HID, 0},
117 {"", 0},
118 };
119 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
120
121 static struct acpi_driver acpi_thermal_driver = {
122 .name = "thermal",
123 .class = ACPI_THERMAL_CLASS,
124 .ids = thermal_device_ids,
125 .ops = {
126 .add = acpi_thermal_add,
127 .remove = acpi_thermal_remove,
128 .resume = acpi_thermal_resume,
129 .notify = acpi_thermal_notify,
130 },
131 };
132
133 struct acpi_thermal_state {
134 u8 critical:1;
135 u8 hot:1;
136 u8 passive:1;
137 u8 active:1;
138 u8 reserved:4;
139 int active_index;
140 };
141
142 struct acpi_thermal_state_flags {
143 u8 valid:1;
144 u8 enabled:1;
145 u8 reserved:6;
146 };
147
148 struct acpi_thermal_critical {
149 struct acpi_thermal_state_flags flags;
150 unsigned long temperature;
151 };
152
153 struct acpi_thermal_hot {
154 struct acpi_thermal_state_flags flags;
155 unsigned long temperature;
156 };
157
158 struct acpi_thermal_passive {
159 struct acpi_thermal_state_flags flags;
160 unsigned long temperature;
161 unsigned long tc1;
162 unsigned long tc2;
163 unsigned long tsp;
164 struct acpi_handle_list devices;
165 };
166
167 struct acpi_thermal_active {
168 struct acpi_thermal_state_flags flags;
169 unsigned long temperature;
170 struct acpi_handle_list devices;
171 };
172
173 struct acpi_thermal_trips {
174 struct acpi_thermal_critical critical;
175 struct acpi_thermal_hot hot;
176 struct acpi_thermal_passive passive;
177 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
178 };
179
180 struct acpi_thermal_flags {
181 u8 cooling_mode:1; /* _SCP */
182 u8 devices:1; /* _TZD */
183 u8 reserved:6;
184 };
185
186 struct acpi_thermal {
187 struct acpi_device * device;
188 acpi_bus_id name;
189 unsigned long temperature;
190 unsigned long last_temperature;
191 unsigned long polling_frequency;
192 volatile u8 zombie;
193 struct acpi_thermal_flags flags;
194 struct acpi_thermal_state state;
195 struct acpi_thermal_trips trips;
196 struct acpi_handle_list devices;
197 struct thermal_zone_device *thermal_zone;
198 int tz_enabled;
199 int kelvin_offset;
200 struct mutex lock;
201 };
202
203 static const struct file_operations acpi_thermal_state_fops = {
204 .owner = THIS_MODULE,
205 .open = acpi_thermal_state_open_fs,
206 .read = seq_read,
207 .llseek = seq_lseek,
208 .release = single_release,
209 };
210
211 static const struct file_operations acpi_thermal_temp_fops = {
212 .owner = THIS_MODULE,
213 .open = acpi_thermal_temp_open_fs,
214 .read = seq_read,
215 .llseek = seq_lseek,
216 .release = single_release,
217 };
218
219 static const struct file_operations acpi_thermal_trip_fops = {
220 .owner = THIS_MODULE,
221 .open = acpi_thermal_trip_open_fs,
222 .read = seq_read,
223 .llseek = seq_lseek,
224 .release = single_release,
225 };
226
227 static const struct file_operations acpi_thermal_cooling_fops = {
228 .owner = THIS_MODULE,
229 .open = acpi_thermal_cooling_open_fs,
230 .read = seq_read,
231 .write = acpi_thermal_write_cooling_mode,
232 .llseek = seq_lseek,
233 .release = single_release,
234 };
235
236 static const struct file_operations acpi_thermal_polling_fops = {
237 .owner = THIS_MODULE,
238 .open = acpi_thermal_polling_open_fs,
239 .read = seq_read,
240 .write = acpi_thermal_write_polling,
241 .llseek = seq_lseek,
242 .release = single_release,
243 };
244
245 /* --------------------------------------------------------------------------
246 Thermal Zone Management
247 -------------------------------------------------------------------------- */
248
249 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
250 {
251 acpi_status status = AE_OK;
252 unsigned long long tmp;
253
254 if (!tz)
255 return -EINVAL;
256
257 tz->last_temperature = tz->temperature;
258
259 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
260 if (ACPI_FAILURE(status))
261 return -ENODEV;
262
263 tz->temperature = tmp;
264 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
265 tz->temperature));
266
267 return 0;
268 }
269
270 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
271 {
272 acpi_status status = AE_OK;
273 unsigned long long tmp;
274
275 if (!tz)
276 return -EINVAL;
277
278 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
279 if (ACPI_FAILURE(status))
280 return -ENODEV;
281
282 tz->polling_frequency = tmp;
283 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
284 tz->polling_frequency));
285
286 return 0;
287 }
288
289 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
290 {
291
292 if (!tz)
293 return -EINVAL;
294
295 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */
296
297 tz->thermal_zone->polling_delay = seconds * 1000;
298
299 if (tz->tz_enabled)
300 thermal_zone_device_update(tz->thermal_zone);
301
302 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
303 "Polling frequency set to %lu seconds\n",
304 tz->polling_frequency/10));
305
306 return 0;
307 }
308
309 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
310 {
311 acpi_status status = AE_OK;
312 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
313 struct acpi_object_list arg_list = { 1, &arg0 };
314 acpi_handle handle = NULL;
315
316
317 if (!tz)
318 return -EINVAL;
319
320 status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
321 if (ACPI_FAILURE(status)) {
322 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
323 return -ENODEV;
324 }
325
326 arg0.integer.value = mode;
327
328 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
329 if (ACPI_FAILURE(status))
330 return -ENODEV;
331
332 return 0;
333 }
334
335 #define ACPI_TRIPS_CRITICAL 0x01
336 #define ACPI_TRIPS_HOT 0x02
337 #define ACPI_TRIPS_PASSIVE 0x04
338 #define ACPI_TRIPS_ACTIVE 0x08
339 #define ACPI_TRIPS_DEVICES 0x10
340
341 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
342 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
343
344 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
345 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
346 ACPI_TRIPS_DEVICES)
347
348 /*
349 * This exception is thrown out in two cases:
350 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
351 * when re-evaluating the AML code.
352 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
353 * We need to re-bind the cooling devices of a thermal zone when this occurs.
354 */
355 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
356 do { \
357 if (flags != ACPI_TRIPS_INIT) \
358 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
359 "ACPI thermal trip point %s changed\n" \
360 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
361 } while (0)
362
363 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
364 {
365 acpi_status status = AE_OK;
366 unsigned long long tmp;
367 struct acpi_handle_list devices;
368 int valid = 0;
369 int i;
370
371 /* Critical Shutdown (required) */
372 if (flag & ACPI_TRIPS_CRITICAL) {
373 status = acpi_evaluate_integer(tz->device->handle,
374 "_CRT", NULL, &tmp);
375 tz->trips.critical.temperature = tmp;
376 /*
377 * Treat freezing temperatures as invalid as well; some
378 * BIOSes return really low values and cause reboots at startup.
379 * Below zero (Celsius) values clearly aren't right for sure..
380 * ... so lets discard those as invalid.
381 */
382 if (ACPI_FAILURE(status) ||
383 tz->trips.critical.temperature <= 2732) {
384 tz->trips.critical.flags.valid = 0;
385 ACPI_EXCEPTION((AE_INFO, status,
386 "No or invalid critical threshold"));
387 return -ENODEV;
388 } else {
389 tz->trips.critical.flags.valid = 1;
390 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
391 "Found critical threshold [%lu]\n",
392 tz->trips.critical.temperature));
393 }
394 if (tz->trips.critical.flags.valid == 1) {
395 if (crt == -1) {
396 tz->trips.critical.flags.valid = 0;
397 } else if (crt > 0) {
398 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
399 /*
400 * Allow override critical threshold
401 */
402 if (crt_k > tz->trips.critical.temperature)
403 printk(KERN_WARNING PREFIX
404 "Critical threshold %d C\n", crt);
405 tz->trips.critical.temperature = crt_k;
406 }
407 }
408 }
409
410 /* Critical Sleep (optional) */
411 if (flag & ACPI_TRIPS_HOT) {
412 status = acpi_evaluate_integer(tz->device->handle,
413 "_HOT", NULL, &tmp);
414 if (ACPI_FAILURE(status)) {
415 tz->trips.hot.flags.valid = 0;
416 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
417 "No hot threshold\n"));
418 } else {
419 tz->trips.hot.temperature = tmp;
420 tz->trips.hot.flags.valid = 1;
421 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
422 "Found hot threshold [%lu]\n",
423 tz->trips.critical.temperature));
424 }
425 }
426
427 /* Passive (optional) */
428 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
429 (flag == ACPI_TRIPS_INIT)) {
430 valid = tz->trips.passive.flags.valid;
431 if (psv == -1) {
432 status = AE_SUPPORT;
433 } else if (psv > 0) {
434 tmp = CELSIUS_TO_KELVIN(psv);
435 status = AE_OK;
436 } else {
437 status = acpi_evaluate_integer(tz->device->handle,
438 "_PSV", NULL, &tmp);
439 }
440
441 if (ACPI_FAILURE(status))
442 tz->trips.passive.flags.valid = 0;
443 else {
444 tz->trips.passive.temperature = tmp;
445 tz->trips.passive.flags.valid = 1;
446 if (flag == ACPI_TRIPS_INIT) {
447 status = acpi_evaluate_integer(
448 tz->device->handle, "_TC1",
449 NULL, &tmp);
450 if (ACPI_FAILURE(status))
451 tz->trips.passive.flags.valid = 0;
452 else
453 tz->trips.passive.tc1 = tmp;
454 status = acpi_evaluate_integer(
455 tz->device->handle, "_TC2",
456 NULL, &tmp);
457 if (ACPI_FAILURE(status))
458 tz->trips.passive.flags.valid = 0;
459 else
460 tz->trips.passive.tc2 = tmp;
461 status = acpi_evaluate_integer(
462 tz->device->handle, "_TSP",
463 NULL, &tmp);
464 if (ACPI_FAILURE(status))
465 tz->trips.passive.flags.valid = 0;
466 else
467 tz->trips.passive.tsp = tmp;
468 }
469 }
470 }
471 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
472 memset(&devices, 0, sizeof(struct acpi_handle_list));
473 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
474 NULL, &devices);
475 if (ACPI_FAILURE(status)) {
476 printk(KERN_WARNING PREFIX
477 "Invalid passive threshold\n");
478 tz->trips.passive.flags.valid = 0;
479 }
480 else
481 tz->trips.passive.flags.valid = 1;
482
483 if (memcmp(&tz->trips.passive.devices, &devices,
484 sizeof(struct acpi_handle_list))) {
485 memcpy(&tz->trips.passive.devices, &devices,
486 sizeof(struct acpi_handle_list));
487 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
488 }
489 }
490 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
491 if (valid != tz->trips.passive.flags.valid)
492 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
493 }
494
495 /* Active (optional) */
496 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
497 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
498 valid = tz->trips.active[i].flags.valid;
499
500 if (act == -1)
501 break; /* disable all active trip points */
502
503 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
504 tz->trips.active[i].flags.valid)) {
505 status = acpi_evaluate_integer(tz->device->handle,
506 name, NULL, &tmp);
507 if (ACPI_FAILURE(status)) {
508 tz->trips.active[i].flags.valid = 0;
509 if (i == 0)
510 break;
511 if (act <= 0)
512 break;
513 if (i == 1)
514 tz->trips.active[0].temperature =
515 CELSIUS_TO_KELVIN(act);
516 else
517 /*
518 * Don't allow override higher than
519 * the next higher trip point
520 */
521 tz->trips.active[i - 1].temperature =
522 (tz->trips.active[i - 2].temperature <
523 CELSIUS_TO_KELVIN(act) ?
524 tz->trips.active[i - 2].temperature :
525 CELSIUS_TO_KELVIN(act));
526 break;
527 } else {
528 tz->trips.active[i].temperature = tmp;
529 tz->trips.active[i].flags.valid = 1;
530 }
531 }
532
533 name[2] = 'L';
534 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
535 memset(&devices, 0, sizeof(struct acpi_handle_list));
536 status = acpi_evaluate_reference(tz->device->handle,
537 name, NULL, &devices);
538 if (ACPI_FAILURE(status)) {
539 printk(KERN_WARNING PREFIX
540 "Invalid active%d threshold\n", i);
541 tz->trips.active[i].flags.valid = 0;
542 }
543 else
544 tz->trips.active[i].flags.valid = 1;
545
546 if (memcmp(&tz->trips.active[i].devices, &devices,
547 sizeof(struct acpi_handle_list))) {
548 memcpy(&tz->trips.active[i].devices, &devices,
549 sizeof(struct acpi_handle_list));
550 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
551 }
552 }
553 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
554 if (valid != tz->trips.active[i].flags.valid)
555 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
556
557 if (!tz->trips.active[i].flags.valid)
558 break;
559 }
560
561 if (flag & ACPI_TRIPS_DEVICES) {
562 memset(&devices, 0, sizeof(struct acpi_handle_list));
563 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
564 NULL, &devices);
565 if (memcmp(&tz->devices, &devices,
566 sizeof(struct acpi_handle_list))) {
567 memcpy(&tz->devices, &devices,
568 sizeof(struct acpi_handle_list));
569 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
570 }
571 }
572
573 return 0;
574 }
575
576 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
577 {
578 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
579
580 if (ret)
581 return ret;
582
583 valid = tz->trips.critical.flags.valid |
584 tz->trips.hot.flags.valid |
585 tz->trips.passive.flags.valid;
586
587 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
588 valid |= tz->trips.active[i].flags.valid;
589
590 if (!valid) {
591 printk(KERN_WARNING FW_BUG "No valid trip found\n");
592 return -ENODEV;
593 }
594 return 0;
595 }
596
597 static void acpi_thermal_check(void *data)
598 {
599 struct acpi_thermal *tz = data;
600
601 thermal_zone_device_update(tz->thermal_zone);
602 }
603
604 /* sys I/F for generic thermal sysfs support */
605 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
606
607 static int thermal_get_temp(struct thermal_zone_device *thermal,
608 unsigned long *temp)
609 {
610 struct acpi_thermal *tz = thermal->devdata;
611 int result;
612
613 if (!tz)
614 return -EINVAL;
615
616 result = acpi_thermal_get_temperature(tz);
617 if (result)
618 return result;
619
620 *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
621 return 0;
622 }
623
624 static const char enabled[] = "kernel";
625 static const char disabled[] = "user";
626 static int thermal_get_mode(struct thermal_zone_device *thermal,
627 enum thermal_device_mode *mode)
628 {
629 struct acpi_thermal *tz = thermal->devdata;
630
631 if (!tz)
632 return -EINVAL;
633
634 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
635 THERMAL_DEVICE_DISABLED;
636
637 return 0;
638 }
639
640 static int thermal_set_mode(struct thermal_zone_device *thermal,
641 enum thermal_device_mode mode)
642 {
643 struct acpi_thermal *tz = thermal->devdata;
644 int enable;
645
646 if (!tz)
647 return -EINVAL;
648
649 /*
650 * enable/disable thermal management from ACPI thermal driver
651 */
652 if (mode == THERMAL_DEVICE_ENABLED)
653 enable = 1;
654 else if (mode == THERMAL_DEVICE_DISABLED)
655 enable = 0;
656 else
657 return -EINVAL;
658
659 if (enable != tz->tz_enabled) {
660 tz->tz_enabled = enable;
661 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
662 "%s ACPI thermal control\n",
663 tz->tz_enabled ? enabled : disabled));
664 acpi_thermal_check(tz);
665 }
666 return 0;
667 }
668
669 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
670 int trip, enum thermal_trip_type *type)
671 {
672 struct acpi_thermal *tz = thermal->devdata;
673 int i;
674
675 if (!tz || trip < 0)
676 return -EINVAL;
677
678 if (tz->trips.critical.flags.valid) {
679 if (!trip) {
680 *type = THERMAL_TRIP_CRITICAL;
681 return 0;
682 }
683 trip--;
684 }
685
686 if (tz->trips.hot.flags.valid) {
687 if (!trip) {
688 *type = THERMAL_TRIP_HOT;
689 return 0;
690 }
691 trip--;
692 }
693
694 if (tz->trips.passive.flags.valid) {
695 if (!trip) {
696 *type = THERMAL_TRIP_PASSIVE;
697 return 0;
698 }
699 trip--;
700 }
701
702 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
703 tz->trips.active[i].flags.valid; i++) {
704 if (!trip) {
705 *type = THERMAL_TRIP_ACTIVE;
706 return 0;
707 }
708 trip--;
709 }
710
711 return -EINVAL;
712 }
713
714 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
715 int trip, unsigned long *temp)
716 {
717 struct acpi_thermal *tz = thermal->devdata;
718 int i;
719
720 if (!tz || trip < 0)
721 return -EINVAL;
722
723 if (tz->trips.critical.flags.valid) {
724 if (!trip) {
725 *temp = KELVIN_TO_MILLICELSIUS(
726 tz->trips.critical.temperature,
727 tz->kelvin_offset);
728 return 0;
729 }
730 trip--;
731 }
732
733 if (tz->trips.hot.flags.valid) {
734 if (!trip) {
735 *temp = KELVIN_TO_MILLICELSIUS(
736 tz->trips.hot.temperature,
737 tz->kelvin_offset);
738 return 0;
739 }
740 trip--;
741 }
742
743 if (tz->trips.passive.flags.valid) {
744 if (!trip) {
745 *temp = KELVIN_TO_MILLICELSIUS(
746 tz->trips.passive.temperature,
747 tz->kelvin_offset);
748 return 0;
749 }
750 trip--;
751 }
752
753 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
754 tz->trips.active[i].flags.valid; i++) {
755 if (!trip) {
756 *temp = KELVIN_TO_MILLICELSIUS(
757 tz->trips.active[i].temperature,
758 tz->kelvin_offset);
759 return 0;
760 }
761 trip--;
762 }
763
764 return -EINVAL;
765 }
766
767 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
768 unsigned long *temperature) {
769 struct acpi_thermal *tz = thermal->devdata;
770
771 if (tz->trips.critical.flags.valid) {
772 *temperature = KELVIN_TO_MILLICELSIUS(
773 tz->trips.critical.temperature,
774 tz->kelvin_offset);
775 return 0;
776 } else
777 return -EINVAL;
778 }
779
780 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
781 enum thermal_trip_type trip_type)
782 {
783 u8 type = 0;
784 struct acpi_thermal *tz = thermal->devdata;
785
786 if (trip_type == THERMAL_TRIP_CRITICAL)
787 type = ACPI_THERMAL_NOTIFY_CRITICAL;
788 else if (trip_type == THERMAL_TRIP_HOT)
789 type = ACPI_THERMAL_NOTIFY_HOT;
790 else
791 return 0;
792
793 acpi_bus_generate_proc_event(tz->device, type, 1);
794 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
795 dev_name(&tz->device->dev), type, 1);
796
797 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
798 return 1;
799
800 return 0;
801 }
802
803 typedef int (*cb)(struct thermal_zone_device *, int,
804 struct thermal_cooling_device *);
805 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
806 struct thermal_cooling_device *cdev,
807 cb action)
808 {
809 struct acpi_device *device = cdev->devdata;
810 struct acpi_thermal *tz = thermal->devdata;
811 struct acpi_device *dev;
812 acpi_status status;
813 acpi_handle handle;
814 int i;
815 int j;
816 int trip = -1;
817 int result = 0;
818
819 if (tz->trips.critical.flags.valid)
820 trip++;
821
822 if (tz->trips.hot.flags.valid)
823 trip++;
824
825 if (tz->trips.passive.flags.valid) {
826 trip++;
827 for (i = 0; i < tz->trips.passive.devices.count;
828 i++) {
829 handle = tz->trips.passive.devices.handles[i];
830 status = acpi_bus_get_device(handle, &dev);
831 if (ACPI_SUCCESS(status) && (dev == device)) {
832 result = action(thermal, trip, cdev);
833 if (result)
834 goto failed;
835 }
836 }
837 }
838
839 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
840 if (!tz->trips.active[i].flags.valid)
841 break;
842 trip++;
843 for (j = 0;
844 j < tz->trips.active[i].devices.count;
845 j++) {
846 handle = tz->trips.active[i].devices.handles[j];
847 status = acpi_bus_get_device(handle, &dev);
848 if (ACPI_SUCCESS(status) && (dev == device)) {
849 result = action(thermal, trip, cdev);
850 if (result)
851 goto failed;
852 }
853 }
854 }
855
856 for (i = 0; i < tz->devices.count; i++) {
857 handle = tz->devices.handles[i];
858 status = acpi_bus_get_device(handle, &dev);
859 if (ACPI_SUCCESS(status) && (dev == device)) {
860 result = action(thermal, -1, cdev);
861 if (result)
862 goto failed;
863 }
864 }
865
866 failed:
867 return result;
868 }
869
870 static int
871 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
872 struct thermal_cooling_device *cdev)
873 {
874 return acpi_thermal_cooling_device_cb(thermal, cdev,
875 thermal_zone_bind_cooling_device);
876 }
877
878 static int
879 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
880 struct thermal_cooling_device *cdev)
881 {
882 return acpi_thermal_cooling_device_cb(thermal, cdev,
883 thermal_zone_unbind_cooling_device);
884 }
885
886 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
887 .bind = acpi_thermal_bind_cooling_device,
888 .unbind = acpi_thermal_unbind_cooling_device,
889 .get_temp = thermal_get_temp,
890 .get_mode = thermal_get_mode,
891 .set_mode = thermal_set_mode,
892 .get_trip_type = thermal_get_trip_type,
893 .get_trip_temp = thermal_get_trip_temp,
894 .get_crit_temp = thermal_get_crit_temp,
895 .notify = thermal_notify,
896 };
897
898 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
899 {
900 int trips = 0;
901 int result;
902 acpi_status status;
903 int i;
904
905 if (tz->trips.critical.flags.valid)
906 trips++;
907
908 if (tz->trips.hot.flags.valid)
909 trips++;
910
911 if (tz->trips.passive.flags.valid)
912 trips++;
913
914 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
915 tz->trips.active[i].flags.valid; i++, trips++);
916
917 if (tz->trips.passive.flags.valid)
918 tz->thermal_zone =
919 thermal_zone_device_register("acpitz", trips, tz,
920 &acpi_thermal_zone_ops,
921 tz->trips.passive.tc1,
922 tz->trips.passive.tc2,
923 tz->trips.passive.tsp*100,
924 tz->polling_frequency*100);
925 else
926 tz->thermal_zone =
927 thermal_zone_device_register("acpitz", trips, tz,
928 &acpi_thermal_zone_ops,
929 0, 0, 0,
930 tz->polling_frequency*100);
931 if (IS_ERR(tz->thermal_zone))
932 return -ENODEV;
933
934 result = sysfs_create_link(&tz->device->dev.kobj,
935 &tz->thermal_zone->device.kobj, "thermal_zone");
936 if (result)
937 return result;
938
939 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
940 &tz->device->dev.kobj, "device");
941 if (result)
942 return result;
943
944 status = acpi_attach_data(tz->device->handle,
945 acpi_bus_private_data_handler,
946 tz->thermal_zone);
947 if (ACPI_FAILURE(status)) {
948 printk(KERN_ERR PREFIX
949 "Error attaching device data\n");
950 return -ENODEV;
951 }
952
953 tz->tz_enabled = 1;
954
955 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
956 tz->thermal_zone->id);
957 return 0;
958 }
959
960 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
961 {
962 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
963 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
964 thermal_zone_device_unregister(tz->thermal_zone);
965 tz->thermal_zone = NULL;
966 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
967 }
968
969
970 /* --------------------------------------------------------------------------
971 FS Interface (/proc)
972 -------------------------------------------------------------------------- */
973
974 static struct proc_dir_entry *acpi_thermal_dir;
975
976 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
977 {
978 struct acpi_thermal *tz = seq->private;
979
980
981 if (!tz)
982 goto end;
983
984 seq_puts(seq, "state: ");
985
986 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
987 && !tz->state.active)
988 seq_puts(seq, "ok\n");
989 else {
990 if (tz->state.critical)
991 seq_puts(seq, "critical ");
992 if (tz->state.hot)
993 seq_puts(seq, "hot ");
994 if (tz->state.passive)
995 seq_puts(seq, "passive ");
996 if (tz->state.active)
997 seq_printf(seq, "active[%d]", tz->state.active_index);
998 seq_puts(seq, "\n");
999 }
1000
1001 end:
1002 return 0;
1003 }
1004
1005 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1006 {
1007 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1008 }
1009
1010 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1011 {
1012 int result = 0;
1013 struct acpi_thermal *tz = seq->private;
1014
1015
1016 if (!tz)
1017 goto end;
1018
1019 result = acpi_thermal_get_temperature(tz);
1020 if (result)
1021 goto end;
1022
1023 seq_printf(seq, "temperature: %ld C\n",
1024 KELVIN_TO_CELSIUS(tz->temperature));
1025
1026 end:
1027 return 0;
1028 }
1029
1030 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1031 {
1032 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1033 }
1034
1035 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1036 {
1037 struct acpi_thermal *tz = seq->private;
1038 struct acpi_device *device;
1039 acpi_status status;
1040
1041 int i = 0;
1042 int j = 0;
1043
1044
1045 if (!tz)
1046 goto end;
1047
1048 if (tz->trips.critical.flags.valid)
1049 seq_printf(seq, "critical (S5): %ld C%s",
1050 KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1051 nocrt ? " <disabled>\n" : "\n");
1052
1053 if (tz->trips.hot.flags.valid)
1054 seq_printf(seq, "hot (S4): %ld C%s",
1055 KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1056 nocrt ? " <disabled>\n" : "\n");
1057
1058 if (tz->trips.passive.flags.valid) {
1059 seq_printf(seq,
1060 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1061 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1062 tz->trips.passive.tc1, tz->trips.passive.tc2,
1063 tz->trips.passive.tsp);
1064 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1065 status = acpi_bus_get_device(tz->trips.passive.devices.
1066 handles[j], &device);
1067 seq_printf(seq, "%4.4s ", status ? "" :
1068 acpi_device_bid(device));
1069 }
1070 seq_puts(seq, "\n");
1071 } else {
1072 seq_printf(seq, "passive (forced):");
1073 if (tz->thermal_zone->forced_passive)
1074 seq_printf(seq, " %i C\n",
1075 tz->thermal_zone->forced_passive / 1000);
1076 else
1077 seq_printf(seq, "<not set>\n");
1078 }
1079
1080 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1081 if (!(tz->trips.active[i].flags.valid))
1082 break;
1083 seq_printf(seq, "active[%d]: %ld C: devices=",
1084 i,
1085 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1086 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1087 status = acpi_bus_get_device(tz->trips.active[i].
1088 devices.handles[j],
1089 &device);
1090 seq_printf(seq, "%4.4s ", status ? "" :
1091 acpi_device_bid(device));
1092 }
1093 seq_puts(seq, "\n");
1094 }
1095
1096 end:
1097 return 0;
1098 }
1099
1100 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1101 {
1102 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1103 }
1104
1105 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1106 {
1107 struct acpi_thermal *tz = seq->private;
1108
1109
1110 if (!tz)
1111 goto end;
1112
1113 if (!tz->flags.cooling_mode)
1114 seq_puts(seq, "<setting not supported>\n");
1115 else
1116 seq_puts(seq, "0 - Active; 1 - Passive\n");
1117
1118 end:
1119 return 0;
1120 }
1121
1122 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1123 {
1124 return single_open(file, acpi_thermal_cooling_seq_show,
1125 PDE(inode)->data);
1126 }
1127
1128 static ssize_t
1129 acpi_thermal_write_cooling_mode(struct file *file,
1130 const char __user * buffer,
1131 size_t count, loff_t * ppos)
1132 {
1133 struct seq_file *m = file->private_data;
1134 struct acpi_thermal *tz = m->private;
1135 int result = 0;
1136 char mode_string[12] = { '\0' };
1137
1138
1139 if (!tz || (count > sizeof(mode_string) - 1))
1140 return -EINVAL;
1141
1142 if (!tz->flags.cooling_mode)
1143 return -ENODEV;
1144
1145 if (copy_from_user(mode_string, buffer, count))
1146 return -EFAULT;
1147
1148 mode_string[count] = '\0';
1149
1150 result = acpi_thermal_set_cooling_mode(tz,
1151 simple_strtoul(mode_string, NULL,
1152 0));
1153 if (result)
1154 return result;
1155
1156 acpi_thermal_check(tz);
1157
1158 return count;
1159 }
1160
1161 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1162 {
1163 struct acpi_thermal *tz = seq->private;
1164
1165
1166 if (!tz)
1167 goto end;
1168
1169 if (!tz->thermal_zone->polling_delay) {
1170 seq_puts(seq, "<polling disabled>\n");
1171 goto end;
1172 }
1173
1174 seq_printf(seq, "polling frequency: %d seconds\n",
1175 (tz->thermal_zone->polling_delay / 1000));
1176
1177 end:
1178 return 0;
1179 }
1180
1181 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1182 {
1183 return single_open(file, acpi_thermal_polling_seq_show,
1184 PDE(inode)->data);
1185 }
1186
1187 static ssize_t
1188 acpi_thermal_write_polling(struct file *file,
1189 const char __user * buffer,
1190 size_t count, loff_t * ppos)
1191 {
1192 struct seq_file *m = file->private_data;
1193 struct acpi_thermal *tz = m->private;
1194 int result = 0;
1195 char polling_string[12] = { '\0' };
1196 int seconds = 0;
1197
1198
1199 if (!tz || (count > sizeof(polling_string) - 1))
1200 return -EINVAL;
1201
1202 if (copy_from_user(polling_string, buffer, count))
1203 return -EFAULT;
1204
1205 polling_string[count] = '\0';
1206
1207 seconds = simple_strtoul(polling_string, NULL, 0);
1208
1209 result = acpi_thermal_set_polling(tz, seconds);
1210 if (result)
1211 return result;
1212
1213 acpi_thermal_check(tz);
1214
1215 return count;
1216 }
1217
1218 static int acpi_thermal_add_fs(struct acpi_device *device)
1219 {
1220 struct proc_dir_entry *entry = NULL;
1221
1222
1223 if (!acpi_device_dir(device)) {
1224 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1225 acpi_thermal_dir);
1226 if (!acpi_device_dir(device))
1227 return -ENODEV;
1228 }
1229
1230 /* 'state' [R] */
1231 entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1232 S_IRUGO, acpi_device_dir(device),
1233 &acpi_thermal_state_fops,
1234 acpi_driver_data(device));
1235 if (!entry)
1236 return -ENODEV;
1237
1238 /* 'temperature' [R] */
1239 entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1240 S_IRUGO, acpi_device_dir(device),
1241 &acpi_thermal_temp_fops,
1242 acpi_driver_data(device));
1243 if (!entry)
1244 return -ENODEV;
1245
1246 /* 'trip_points' [R] */
1247 entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1248 S_IRUGO,
1249 acpi_device_dir(device),
1250 &acpi_thermal_trip_fops,
1251 acpi_driver_data(device));
1252 if (!entry)
1253 return -ENODEV;
1254
1255 /* 'cooling_mode' [R/W] */
1256 entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1257 S_IFREG | S_IRUGO | S_IWUSR,
1258 acpi_device_dir(device),
1259 &acpi_thermal_cooling_fops,
1260 acpi_driver_data(device));
1261 if (!entry)
1262 return -ENODEV;
1263
1264 /* 'polling_frequency' [R/W] */
1265 entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1266 S_IFREG | S_IRUGO | S_IWUSR,
1267 acpi_device_dir(device),
1268 &acpi_thermal_polling_fops,
1269 acpi_driver_data(device));
1270 if (!entry)
1271 return -ENODEV;
1272 return 0;
1273 }
1274
1275 static int acpi_thermal_remove_fs(struct acpi_device *device)
1276 {
1277
1278 if (acpi_device_dir(device)) {
1279 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1280 acpi_device_dir(device));
1281 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1282 acpi_device_dir(device));
1283 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1284 acpi_device_dir(device));
1285 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1286 acpi_device_dir(device));
1287 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1288 acpi_device_dir(device));
1289 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1290 acpi_device_dir(device) = NULL;
1291 }
1292
1293 return 0;
1294 }
1295
1296 /* --------------------------------------------------------------------------
1297 Driver Interface
1298 -------------------------------------------------------------------------- */
1299
1300 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
1301 {
1302 struct acpi_thermal *tz = acpi_driver_data(device);
1303
1304
1305 if (!tz)
1306 return;
1307
1308 switch (event) {
1309 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1310 acpi_thermal_check(tz);
1311 break;
1312 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1313 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1314 acpi_thermal_check(tz);
1315 acpi_bus_generate_proc_event(device, event, 0);
1316 acpi_bus_generate_netlink_event(device->pnp.device_class,
1317 dev_name(&device->dev), event, 0);
1318 break;
1319 case ACPI_THERMAL_NOTIFY_DEVICES:
1320 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1321 acpi_thermal_check(tz);
1322 acpi_bus_generate_proc_event(device, event, 0);
1323 acpi_bus_generate_netlink_event(device->pnp.device_class,
1324 dev_name(&device->dev), event, 0);
1325 break;
1326 default:
1327 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1328 "Unsupported event [0x%x]\n", event));
1329 break;
1330 }
1331 }
1332
1333 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1334 {
1335 int result = 0;
1336
1337
1338 if (!tz)
1339 return -EINVAL;
1340
1341 /* Get temperature [_TMP] (required) */
1342 result = acpi_thermal_get_temperature(tz);
1343 if (result)
1344 return result;
1345
1346 /* Get trip points [_CRT, _PSV, etc.] (required) */
1347 result = acpi_thermal_get_trip_points(tz);
1348 if (result)
1349 return result;
1350
1351 /* Set the cooling mode [_SCP] to active cooling (default) */
1352 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1353 if (!result)
1354 tz->flags.cooling_mode = 1;
1355
1356 /* Get default polling frequency [_TZP] (optional) */
1357 if (tzp)
1358 tz->polling_frequency = tzp;
1359 else
1360 acpi_thermal_get_polling_frequency(tz);
1361
1362 return 0;
1363 }
1364
1365 /*
1366 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1367 * handles temperature values with a single decimal place. As a consequence,
1368 * some implementations use an offset of 273.1 and others use an offset of
1369 * 273.2. Try to find out which one is being used, to present the most
1370 * accurate and visually appealing number.
1371 *
1372 * The heuristic below should work for all ACPI thermal zones which have a
1373 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1374 */
1375 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1376 {
1377 if (tz->trips.critical.flags.valid &&
1378 (tz->trips.critical.temperature % 5) == 1)
1379 tz->kelvin_offset = 2731;
1380 else
1381 tz->kelvin_offset = 2732;
1382 }
1383
1384 static int acpi_thermal_add(struct acpi_device *device)
1385 {
1386 int result = 0;
1387 struct acpi_thermal *tz = NULL;
1388
1389
1390 if (!device)
1391 return -EINVAL;
1392
1393 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1394 if (!tz)
1395 return -ENOMEM;
1396
1397 tz->device = device;
1398 strcpy(tz->name, device->pnp.bus_id);
1399 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1400 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1401 device->driver_data = tz;
1402 mutex_init(&tz->lock);
1403
1404
1405 result = acpi_thermal_get_info(tz);
1406 if (result)
1407 goto free_memory;
1408
1409 acpi_thermal_guess_offset(tz);
1410
1411 result = acpi_thermal_register_thermal_zone(tz);
1412 if (result)
1413 goto free_memory;
1414
1415 result = acpi_thermal_add_fs(device);
1416 if (result)
1417 goto unregister_thermal_zone;
1418
1419 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1420 acpi_device_name(device), acpi_device_bid(device),
1421 KELVIN_TO_CELSIUS(tz->temperature));
1422 goto end;
1423
1424 unregister_thermal_zone:
1425 thermal_zone_device_unregister(tz->thermal_zone);
1426 free_memory:
1427 kfree(tz);
1428 end:
1429 return result;
1430 }
1431
1432 static int acpi_thermal_remove(struct acpi_device *device, int type)
1433 {
1434 struct acpi_thermal *tz = NULL;
1435
1436 if (!device || !acpi_driver_data(device))
1437 return -EINVAL;
1438
1439 tz = acpi_driver_data(device);
1440
1441 acpi_thermal_remove_fs(device);
1442 acpi_thermal_unregister_thermal_zone(tz);
1443 mutex_destroy(&tz->lock);
1444 kfree(tz);
1445 return 0;
1446 }
1447
1448 static int acpi_thermal_resume(struct acpi_device *device)
1449 {
1450 struct acpi_thermal *tz = NULL;
1451 int i, j, power_state, result;
1452
1453
1454 if (!device || !acpi_driver_data(device))
1455 return -EINVAL;
1456
1457 tz = acpi_driver_data(device);
1458
1459 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1460 if (!(&tz->trips.active[i]))
1461 break;
1462 if (!tz->trips.active[i].flags.valid)
1463 break;
1464 tz->trips.active[i].flags.enabled = 1;
1465 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1466 result = acpi_bus_get_power(tz->trips.active[i].devices.
1467 handles[j], &power_state);
1468 if (result || (power_state != ACPI_STATE_D0)) {
1469 tz->trips.active[i].flags.enabled = 0;
1470 break;
1471 }
1472 }
1473 tz->state.active |= tz->trips.active[i].flags.enabled;
1474 }
1475
1476 acpi_thermal_check(tz);
1477
1478 return AE_OK;
1479 }
1480
1481 static int thermal_act(const struct dmi_system_id *d) {
1482
1483 if (act == 0) {
1484 printk(KERN_NOTICE "ACPI: %s detected: "
1485 "disabling all active thermal trip points\n", d->ident);
1486 act = -1;
1487 }
1488 return 0;
1489 }
1490 static int thermal_nocrt(const struct dmi_system_id *d) {
1491
1492 printk(KERN_NOTICE "ACPI: %s detected: "
1493 "disabling all critical thermal trip point actions.\n", d->ident);
1494 nocrt = 1;
1495 return 0;
1496 }
1497 static int thermal_tzp(const struct dmi_system_id *d) {
1498
1499 if (tzp == 0) {
1500 printk(KERN_NOTICE "ACPI: %s detected: "
1501 "enabling thermal zone polling\n", d->ident);
1502 tzp = 300; /* 300 dS = 30 Seconds */
1503 }
1504 return 0;
1505 }
1506 static int thermal_psv(const struct dmi_system_id *d) {
1507
1508 if (psv == 0) {
1509 printk(KERN_NOTICE "ACPI: %s detected: "
1510 "disabling all passive thermal trip points\n", d->ident);
1511 psv = -1;
1512 }
1513 return 0;
1514 }
1515
1516 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1517 /*
1518 * Award BIOS on this AOpen makes thermal control almost worthless.
1519 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1520 */
1521 {
1522 .callback = thermal_act,
1523 .ident = "AOpen i915GMm-HFS",
1524 .matches = {
1525 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1526 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1527 },
1528 },
1529 {
1530 .callback = thermal_psv,
1531 .ident = "AOpen i915GMm-HFS",
1532 .matches = {
1533 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1534 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1535 },
1536 },
1537 {
1538 .callback = thermal_tzp,
1539 .ident = "AOpen i915GMm-HFS",
1540 .matches = {
1541 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1542 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1543 },
1544 },
1545 {
1546 .callback = thermal_nocrt,
1547 .ident = "Gigabyte GA-7ZX",
1548 .matches = {
1549 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1550 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1551 },
1552 },
1553 {}
1554 };
1555
1556 static int __init acpi_thermal_init(void)
1557 {
1558 int result = 0;
1559
1560 dmi_check_system(thermal_dmi_table);
1561
1562 if (off) {
1563 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1564 return -ENODEV;
1565 }
1566 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1567 if (!acpi_thermal_dir)
1568 return -ENODEV;
1569
1570 result = acpi_bus_register_driver(&acpi_thermal_driver);
1571 if (result < 0) {
1572 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1573 return -ENODEV;
1574 }
1575
1576 return 0;
1577 }
1578
1579 static void __exit acpi_thermal_exit(void)
1580 {
1581
1582 acpi_bus_unregister_driver(&acpi_thermal_driver);
1583
1584 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1585
1586 return;
1587 }
1588
1589 module_init(acpi_thermal_init);
1590 module_exit(acpi_thermal_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree