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nommu: fix an incorrect comment in the do_mmap_shared_file()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / acpi / thermal.c
blob5d3893558cf73566e128f36e6e11482c13ccbef2
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 */
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.flags.valid = 0;
384 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
385 "No critical threshold\n"));
386 } else if (tmp <= 2732) {
387 printk(KERN_WARNING FW_BUG "Invalid critical threshold "
388 "(%llu)\n", tmp);
389 tz->trips.critical.flags.valid = 0;
390 } else {
391 tz->trips.critical.flags.valid = 1;
392 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
393 "Found critical threshold [%lu]\n",
394 tz->trips.critical.temperature));
395 }
396 if (tz->trips.critical.flags.valid == 1) {
397 if (crt == -1) {
398 tz->trips.critical.flags.valid = 0;
399 } else if (crt > 0) {
400 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
401 /*
402 * Allow override critical threshold
403 */
404 if (crt_k > tz->trips.critical.temperature)
405 printk(KERN_WARNING PREFIX
406 "Critical threshold %d C\n", crt);
407 tz->trips.critical.temperature = crt_k;
408 }
409 }
410 }
411
412 /* Critical Sleep (optional) */
413 if (flag & ACPI_TRIPS_HOT) {
414 status = acpi_evaluate_integer(tz->device->handle,
415 "_HOT", NULL, &tmp);
416 if (ACPI_FAILURE(status)) {
417 tz->trips.hot.flags.valid = 0;
418 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
419 "No hot threshold\n"));
420 } else {
421 tz->trips.hot.temperature = tmp;
422 tz->trips.hot.flags.valid = 1;
423 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
424 "Found hot threshold [%lu]\n",
425 tz->trips.critical.temperature));
426 }
427 }
428
429 /* Passive (optional) */
430 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
431 (flag == ACPI_TRIPS_INIT)) {
432 valid = tz->trips.passive.flags.valid;
433 if (psv == -1) {
434 status = AE_SUPPORT;
435 } else if (psv > 0) {
436 tmp = CELSIUS_TO_KELVIN(psv);
437 status = AE_OK;
438 } else {
439 status = acpi_evaluate_integer(tz->device->handle,
440 "_PSV", NULL, &tmp);
441 }
442
443 if (ACPI_FAILURE(status))
444 tz->trips.passive.flags.valid = 0;
445 else {
446 tz->trips.passive.temperature = tmp;
447 tz->trips.passive.flags.valid = 1;
448 if (flag == ACPI_TRIPS_INIT) {
449 status = acpi_evaluate_integer(
450 tz->device->handle, "_TC1",
451 NULL, &tmp);
452 if (ACPI_FAILURE(status))
453 tz->trips.passive.flags.valid = 0;
454 else
455 tz->trips.passive.tc1 = tmp;
456 status = acpi_evaluate_integer(
457 tz->device->handle, "_TC2",
458 NULL, &tmp);
459 if (ACPI_FAILURE(status))
460 tz->trips.passive.flags.valid = 0;
461 else
462 tz->trips.passive.tc2 = tmp;
463 status = acpi_evaluate_integer(
464 tz->device->handle, "_TSP",
465 NULL, &tmp);
466 if (ACPI_FAILURE(status))
467 tz->trips.passive.flags.valid = 0;
468 else
469 tz->trips.passive.tsp = tmp;
470 }
471 }
472 }
473 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
474 memset(&devices, 0, sizeof(struct acpi_handle_list));
475 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
476 NULL, &devices);
477 if (ACPI_FAILURE(status)) {
478 printk(KERN_WARNING PREFIX
479 "Invalid passive threshold\n");
480 tz->trips.passive.flags.valid = 0;
481 }
482 else
483 tz->trips.passive.flags.valid = 1;
484
485 if (memcmp(&tz->trips.passive.devices, &devices,
486 sizeof(struct acpi_handle_list))) {
487 memcpy(&tz->trips.passive.devices, &devices,
488 sizeof(struct acpi_handle_list));
489 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
490 }
491 }
492 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
493 if (valid != tz->trips.passive.flags.valid)
494 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
495 }
496
497 /* Active (optional) */
498 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
499 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
500 valid = tz->trips.active[i].flags.valid;
501
502 if (act == -1)
503 break; /* disable all active trip points */
504
505 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
506 tz->trips.active[i].flags.valid)) {
507 status = acpi_evaluate_integer(tz->device->handle,
508 name, NULL, &tmp);
509 if (ACPI_FAILURE(status)) {
510 tz->trips.active[i].flags.valid = 0;
511 if (i == 0)
512 break;
513 if (act <= 0)
514 break;
515 if (i == 1)
516 tz->trips.active[0].temperature =
517 CELSIUS_TO_KELVIN(act);
518 else
519 /*
520 * Don't allow override higher than
521 * the next higher trip point
522 */
523 tz->trips.active[i - 1].temperature =
524 (tz->trips.active[i - 2].temperature <
525 CELSIUS_TO_KELVIN(act) ?
526 tz->trips.active[i - 2].temperature :
527 CELSIUS_TO_KELVIN(act));
528 break;
529 } else {
530 tz->trips.active[i].temperature = tmp;
531 tz->trips.active[i].flags.valid = 1;
532 }
533 }
534
535 name[2] = 'L';
536 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
537 memset(&devices, 0, sizeof(struct acpi_handle_list));
538 status = acpi_evaluate_reference(tz->device->handle,
539 name, NULL, &devices);
540 if (ACPI_FAILURE(status)) {
541 printk(KERN_WARNING PREFIX
542 "Invalid active%d threshold\n", i);
543 tz->trips.active[i].flags.valid = 0;
544 }
545 else
546 tz->trips.active[i].flags.valid = 1;
547
548 if (memcmp(&tz->trips.active[i].devices, &devices,
549 sizeof(struct acpi_handle_list))) {
550 memcpy(&tz->trips.active[i].devices, &devices,
551 sizeof(struct acpi_handle_list));
552 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
553 }
554 }
555 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
556 if (valid != tz->trips.active[i].flags.valid)
557 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
558
559 if (!tz->trips.active[i].flags.valid)
560 break;
561 }
562
563 if (flag & ACPI_TRIPS_DEVICES) {
564 memset(&devices, 0, sizeof(struct acpi_handle_list));
565 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
566 NULL, &devices);
567 if (memcmp(&tz->devices, &devices,
568 sizeof(struct acpi_handle_list))) {
569 memcpy(&tz->devices, &devices,
570 sizeof(struct acpi_handle_list));
571 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
572 }
573 }
574
575 return 0;
576 }
577
578 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
579 {
580 int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
581
582 if (ret)
583 return ret;
584
585 valid = tz->trips.critical.flags.valid |
586 tz->trips.hot.flags.valid |
587 tz->trips.passive.flags.valid;
588
589 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
590 valid |= tz->trips.active[i].flags.valid;
591
592 if (!valid) {
593 printk(KERN_WARNING FW_BUG "No valid trip found\n");
594 return -ENODEV;
595 }
596 return 0;
597 }
598
599 static void acpi_thermal_check(void *data)
600 {
601 struct acpi_thermal *tz = data;
602
603 thermal_zone_device_update(tz->thermal_zone);
604 }
605
606 /* sys I/F for generic thermal sysfs support */
607 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
608
609 static int thermal_get_temp(struct thermal_zone_device *thermal,
610 unsigned long *temp)
611 {
612 struct acpi_thermal *tz = thermal->devdata;
613 int result;
614
615 if (!tz)
616 return -EINVAL;
617
618 result = acpi_thermal_get_temperature(tz);
619 if (result)
620 return result;
621
622 *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
623 return 0;
624 }
625
626 static const char enabled[] = "kernel";
627 static const char disabled[] = "user";
628 static int thermal_get_mode(struct thermal_zone_device *thermal,
629 enum thermal_device_mode *mode)
630 {
631 struct acpi_thermal *tz = thermal->devdata;
632
633 if (!tz)
634 return -EINVAL;
635
636 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
637 THERMAL_DEVICE_DISABLED;
638
639 return 0;
640 }
641
642 static int thermal_set_mode(struct thermal_zone_device *thermal,
643 enum thermal_device_mode mode)
644 {
645 struct acpi_thermal *tz = thermal->devdata;
646 int enable;
647
648 if (!tz)
649 return -EINVAL;
650
651 /*
652 * enable/disable thermal management from ACPI thermal driver
653 */
654 if (mode == THERMAL_DEVICE_ENABLED)
655 enable = 1;
656 else if (mode == THERMAL_DEVICE_DISABLED)
657 enable = 0;
658 else
659 return -EINVAL;
660
661 if (enable != tz->tz_enabled) {
662 tz->tz_enabled = enable;
663 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
664 "%s ACPI thermal control\n",
665 tz->tz_enabled ? enabled : disabled));
666 acpi_thermal_check(tz);
667 }
668 return 0;
669 }
670
671 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
672 int trip, enum thermal_trip_type *type)
673 {
674 struct acpi_thermal *tz = thermal->devdata;
675 int i;
676
677 if (!tz || trip < 0)
678 return -EINVAL;
679
680 if (tz->trips.critical.flags.valid) {
681 if (!trip) {
682 *type = THERMAL_TRIP_CRITICAL;
683 return 0;
684 }
685 trip--;
686 }
687
688 if (tz->trips.hot.flags.valid) {
689 if (!trip) {
690 *type = THERMAL_TRIP_HOT;
691 return 0;
692 }
693 trip--;
694 }
695
696 if (tz->trips.passive.flags.valid) {
697 if (!trip) {
698 *type = THERMAL_TRIP_PASSIVE;
699 return 0;
700 }
701 trip--;
702 }
703
704 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
705 tz->trips.active[i].flags.valid; i++) {
706 if (!trip) {
707 *type = THERMAL_TRIP_ACTIVE;
708 return 0;
709 }
710 trip--;
711 }
712
713 return -EINVAL;
714 }
715
716 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
717 int trip, unsigned long *temp)
718 {
719 struct acpi_thermal *tz = thermal->devdata;
720 int i;
721
722 if (!tz || trip < 0)
723 return -EINVAL;
724
725 if (tz->trips.critical.flags.valid) {
726 if (!trip) {
727 *temp = KELVIN_TO_MILLICELSIUS(
728 tz->trips.critical.temperature,
729 tz->kelvin_offset);
730 return 0;
731 }
732 trip--;
733 }
734
735 if (tz->trips.hot.flags.valid) {
736 if (!trip) {
737 *temp = KELVIN_TO_MILLICELSIUS(
738 tz->trips.hot.temperature,
739 tz->kelvin_offset);
740 return 0;
741 }
742 trip--;
743 }
744
745 if (tz->trips.passive.flags.valid) {
746 if (!trip) {
747 *temp = KELVIN_TO_MILLICELSIUS(
748 tz->trips.passive.temperature,
749 tz->kelvin_offset);
750 return 0;
751 }
752 trip--;
753 }
754
755 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
756 tz->trips.active[i].flags.valid; i++) {
757 if (!trip) {
758 *temp = KELVIN_TO_MILLICELSIUS(
759 tz->trips.active[i].temperature,
760 tz->kelvin_offset);
761 return 0;
762 }
763 trip--;
764 }
765
766 return -EINVAL;
767 }
768
769 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
770 unsigned long *temperature) {
771 struct acpi_thermal *tz = thermal->devdata;
772
773 if (tz->trips.critical.flags.valid) {
774 *temperature = KELVIN_TO_MILLICELSIUS(
775 tz->trips.critical.temperature,
776 tz->kelvin_offset);
777 return 0;
778 } else
779 return -EINVAL;
780 }
781
782 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
783 enum thermal_trip_type trip_type)
784 {
785 u8 type = 0;
786 struct acpi_thermal *tz = thermal->devdata;
787
788 if (trip_type == THERMAL_TRIP_CRITICAL)
789 type = ACPI_THERMAL_NOTIFY_CRITICAL;
790 else if (trip_type == THERMAL_TRIP_HOT)
791 type = ACPI_THERMAL_NOTIFY_HOT;
792 else
793 return 0;
794
795 acpi_bus_generate_proc_event(tz->device, type, 1);
796 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
797 dev_name(&tz->device->dev), type, 1);
798
799 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
800 return 1;
801
802 return 0;
803 }
804
805 typedef int (*cb)(struct thermal_zone_device *, int,
806 struct thermal_cooling_device *);
807 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
808 struct thermal_cooling_device *cdev,
809 cb action)
810 {
811 struct acpi_device *device = cdev->devdata;
812 struct acpi_thermal *tz = thermal->devdata;
813 struct acpi_device *dev;
814 acpi_status status;
815 acpi_handle handle;
816 int i;
817 int j;
818 int trip = -1;
819 int result = 0;
820
821 if (tz->trips.critical.flags.valid)
822 trip++;
823
824 if (tz->trips.hot.flags.valid)
825 trip++;
826
827 if (tz->trips.passive.flags.valid) {
828 trip++;
829 for (i = 0; i < tz->trips.passive.devices.count;
830 i++) {
831 handle = tz->trips.passive.devices.handles[i];
832 status = acpi_bus_get_device(handle, &dev);
833 if (ACPI_SUCCESS(status) && (dev == device)) {
834 result = action(thermal, trip, cdev);
835 if (result)
836 goto failed;
837 }
838 }
839 }
840
841 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
842 if (!tz->trips.active[i].flags.valid)
843 break;
844 trip++;
845 for (j = 0;
846 j < tz->trips.active[i].devices.count;
847 j++) {
848 handle = tz->trips.active[i].devices.handles[j];
849 status = acpi_bus_get_device(handle, &dev);
850 if (ACPI_SUCCESS(status) && (dev == device)) {
851 result = action(thermal, trip, cdev);
852 if (result)
853 goto failed;
854 }
855 }
856 }
857
858 for (i = 0; i < tz->devices.count; i++) {
859 handle = tz->devices.handles[i];
860 status = acpi_bus_get_device(handle, &dev);
861 if (ACPI_SUCCESS(status) && (dev == device)) {
862 result = action(thermal, -1, cdev);
863 if (result)
864 goto failed;
865 }
866 }
867
868 failed:
869 return result;
870 }
871
872 static int
873 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
874 struct thermal_cooling_device *cdev)
875 {
876 return acpi_thermal_cooling_device_cb(thermal, cdev,
877 thermal_zone_bind_cooling_device);
878 }
879
880 static int
881 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
882 struct thermal_cooling_device *cdev)
883 {
884 return acpi_thermal_cooling_device_cb(thermal, cdev,
885 thermal_zone_unbind_cooling_device);
886 }
887
888 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
889 .bind = acpi_thermal_bind_cooling_device,
890 .unbind = acpi_thermal_unbind_cooling_device,
891 .get_temp = thermal_get_temp,
892 .get_mode = thermal_get_mode,
893 .set_mode = thermal_set_mode,
894 .get_trip_type = thermal_get_trip_type,
895 .get_trip_temp = thermal_get_trip_temp,
896 .get_crit_temp = thermal_get_crit_temp,
897 .notify = thermal_notify,
898 };
899
900 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
901 {
902 int trips = 0;
903 int result;
904 acpi_status status;
905 int i;
906
907 if (tz->trips.critical.flags.valid)
908 trips++;
909
910 if (tz->trips.hot.flags.valid)
911 trips++;
912
913 if (tz->trips.passive.flags.valid)
914 trips++;
915
916 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
917 tz->trips.active[i].flags.valid; i++, trips++);
918
919 if (tz->trips.passive.flags.valid)
920 tz->thermal_zone =
921 thermal_zone_device_register("acpitz", trips, tz,
922 &acpi_thermal_zone_ops,
923 tz->trips.passive.tc1,
924 tz->trips.passive.tc2,
925 tz->trips.passive.tsp*100,
926 tz->polling_frequency*100);
927 else
928 tz->thermal_zone =
929 thermal_zone_device_register("acpitz", trips, tz,
930 &acpi_thermal_zone_ops,
931 0, 0, 0,
932 tz->polling_frequency*100);
933 if (IS_ERR(tz->thermal_zone))
934 return -ENODEV;
935
936 result = sysfs_create_link(&tz->device->dev.kobj,
937 &tz->thermal_zone->device.kobj, "thermal_zone");
938 if (result)
939 return result;
940
941 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
942 &tz->device->dev.kobj, "device");
943 if (result)
944 return result;
945
946 status = acpi_attach_data(tz->device->handle,
947 acpi_bus_private_data_handler,
948 tz->thermal_zone);
949 if (ACPI_FAILURE(status)) {
950 printk(KERN_ERR PREFIX
951 "Error attaching device data\n");
952 return -ENODEV;
953 }
954
955 tz->tz_enabled = 1;
956
957 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
958 tz->thermal_zone->id);
959 return 0;
960 }
961
962 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
963 {
964 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
965 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
966 thermal_zone_device_unregister(tz->thermal_zone);
967 tz->thermal_zone = NULL;
968 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
969 }
970
971
972 /* --------------------------------------------------------------------------
973 FS Interface (/proc)
974 -------------------------------------------------------------------------- */
975
976 static struct proc_dir_entry *acpi_thermal_dir;
977
978 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
979 {
980 struct acpi_thermal *tz = seq->private;
981
982
983 if (!tz)
984 goto end;
985
986 seq_puts(seq, "state: ");
987
988 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
989 && !tz->state.active)
990 seq_puts(seq, "ok\n");
991 else {
992 if (tz->state.critical)
993 seq_puts(seq, "critical ");
994 if (tz->state.hot)
995 seq_puts(seq, "hot ");
996 if (tz->state.passive)
997 seq_puts(seq, "passive ");
998 if (tz->state.active)
999 seq_printf(seq, "active[%d]", tz->state.active_index);
1000 seq_puts(seq, "\n");
1001 }
1002
1003 end:
1004 return 0;
1005 }
1006
1007 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1008 {
1009 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1010 }
1011
1012 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1013 {
1014 int result = 0;
1015 struct acpi_thermal *tz = seq->private;
1016
1017
1018 if (!tz)
1019 goto end;
1020
1021 result = acpi_thermal_get_temperature(tz);
1022 if (result)
1023 goto end;
1024
1025 seq_printf(seq, "temperature: %ld C\n",
1026 KELVIN_TO_CELSIUS(tz->temperature));
1027
1028 end:
1029 return 0;
1030 }
1031
1032 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1033 {
1034 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1035 }
1036
1037 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1038 {
1039 struct acpi_thermal *tz = seq->private;
1040 struct acpi_device *device;
1041 acpi_status status;
1042
1043 int i = 0;
1044 int j = 0;
1045
1046
1047 if (!tz)
1048 goto end;
1049
1050 if (tz->trips.critical.flags.valid)
1051 seq_printf(seq, "critical (S5): %ld C%s",
1052 KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1053 nocrt ? " <disabled>\n" : "\n");
1054
1055 if (tz->trips.hot.flags.valid)
1056 seq_printf(seq, "hot (S4): %ld C%s",
1057 KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1058 nocrt ? " <disabled>\n" : "\n");
1059
1060 if (tz->trips.passive.flags.valid) {
1061 seq_printf(seq,
1062 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1063 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1064 tz->trips.passive.tc1, tz->trips.passive.tc2,
1065 tz->trips.passive.tsp);
1066 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1067 status = acpi_bus_get_device(tz->trips.passive.devices.
1068 handles[j], &device);
1069 seq_printf(seq, "%4.4s ", status ? "" :
1070 acpi_device_bid(device));
1071 }
1072 seq_puts(seq, "\n");
1073 } else {
1074 seq_printf(seq, "passive (forced):");
1075 if (tz->thermal_zone->forced_passive)
1076 seq_printf(seq, " %i C\n",
1077 tz->thermal_zone->forced_passive / 1000);
1078 else
1079 seq_printf(seq, "<not set>\n");
1080 }
1081
1082 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1083 if (!(tz->trips.active[i].flags.valid))
1084 break;
1085 seq_printf(seq, "active[%d]: %ld C: devices=",
1086 i,
1087 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1088 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1089 status = acpi_bus_get_device(tz->trips.active[i].
1090 devices.handles[j],
1091 &device);
1092 seq_printf(seq, "%4.4s ", status ? "" :
1093 acpi_device_bid(device));
1094 }
1095 seq_puts(seq, "\n");
1096 }
1097
1098 end:
1099 return 0;
1100 }
1101
1102 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1103 {
1104 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1105 }
1106
1107 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1108 {
1109 struct acpi_thermal *tz = seq->private;
1110
1111
1112 if (!tz)
1113 goto end;
1114
1115 if (!tz->flags.cooling_mode)
1116 seq_puts(seq, "<setting not supported>\n");
1117 else
1118 seq_puts(seq, "0 - Active; 1 - Passive\n");
1119
1120 end:
1121 return 0;
1122 }
1123
1124 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1125 {
1126 return single_open(file, acpi_thermal_cooling_seq_show,
1127 PDE(inode)->data);
1128 }
1129
1130 static ssize_t
1131 acpi_thermal_write_cooling_mode(struct file *file,
1132 const char __user * buffer,
1133 size_t count, loff_t * ppos)
1134 {
1135 struct seq_file *m = file->private_data;
1136 struct acpi_thermal *tz = m->private;
1137 int result = 0;
1138 char mode_string[12] = { '\0' };
1139
1140
1141 if (!tz || (count > sizeof(mode_string) - 1))
1142 return -EINVAL;
1143
1144 if (!tz->flags.cooling_mode)
1145 return -ENODEV;
1146
1147 if (copy_from_user(mode_string, buffer, count))
1148 return -EFAULT;
1149
1150 mode_string[count] = '\0';
1151
1152 result = acpi_thermal_set_cooling_mode(tz,
1153 simple_strtoul(mode_string, NULL,
1154 0));
1155 if (result)
1156 return result;
1157
1158 acpi_thermal_check(tz);
1159
1160 return count;
1161 }
1162
1163 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1164 {
1165 struct acpi_thermal *tz = seq->private;
1166
1167
1168 if (!tz)
1169 goto end;
1170
1171 if (!tz->thermal_zone->polling_delay) {
1172 seq_puts(seq, "<polling disabled>\n");
1173 goto end;
1174 }
1175
1176 seq_printf(seq, "polling frequency: %d seconds\n",
1177 (tz->thermal_zone->polling_delay / 1000));
1178
1179 end:
1180 return 0;
1181 }
1182
1183 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1184 {
1185 return single_open(file, acpi_thermal_polling_seq_show,
1186 PDE(inode)->data);
1187 }
1188
1189 static ssize_t
1190 acpi_thermal_write_polling(struct file *file,
1191 const char __user * buffer,
1192 size_t count, loff_t * ppos)
1193 {
1194 struct seq_file *m = file->private_data;
1195 struct acpi_thermal *tz = m->private;
1196 int result = 0;
1197 char polling_string[12] = { '\0' };
1198 int seconds = 0;
1199
1200
1201 if (!tz || (count > sizeof(polling_string) - 1))
1202 return -EINVAL;
1203
1204 if (copy_from_user(polling_string, buffer, count))
1205 return -EFAULT;
1206
1207 polling_string[count] = '\0';
1208
1209 seconds = simple_strtoul(polling_string, NULL, 0);
1210
1211 result = acpi_thermal_set_polling(tz, seconds);
1212 if (result)
1213 return result;
1214
1215 acpi_thermal_check(tz);
1216
1217 return count;
1218 }
1219
1220 static int acpi_thermal_add_fs(struct acpi_device *device)
1221 {
1222 struct proc_dir_entry *entry = NULL;
1223
1224
1225 if (!acpi_device_dir(device)) {
1226 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1227 acpi_thermal_dir);
1228 if (!acpi_device_dir(device))
1229 return -ENODEV;
1230 }
1231
1232 /* 'state' [R] */
1233 entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1234 S_IRUGO, acpi_device_dir(device),
1235 &acpi_thermal_state_fops,
1236 acpi_driver_data(device));
1237 if (!entry)
1238 return -ENODEV;
1239
1240 /* 'temperature' [R] */
1241 entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1242 S_IRUGO, acpi_device_dir(device),
1243 &acpi_thermal_temp_fops,
1244 acpi_driver_data(device));
1245 if (!entry)
1246 return -ENODEV;
1247
1248 /* 'trip_points' [R] */
1249 entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1250 S_IRUGO,
1251 acpi_device_dir(device),
1252 &acpi_thermal_trip_fops,
1253 acpi_driver_data(device));
1254 if (!entry)
1255 return -ENODEV;
1256
1257 /* 'cooling_mode' [R/W] */
1258 entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1259 S_IFREG | S_IRUGO | S_IWUSR,
1260 acpi_device_dir(device),
1261 &acpi_thermal_cooling_fops,
1262 acpi_driver_data(device));
1263 if (!entry)
1264 return -ENODEV;
1265
1266 /* 'polling_frequency' [R/W] */
1267 entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1268 S_IFREG | S_IRUGO | S_IWUSR,
1269 acpi_device_dir(device),
1270 &acpi_thermal_polling_fops,
1271 acpi_driver_data(device));
1272 if (!entry)
1273 return -ENODEV;
1274 return 0;
1275 }
1276
1277 static int acpi_thermal_remove_fs(struct acpi_device *device)
1278 {
1279
1280 if (acpi_device_dir(device)) {
1281 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1282 acpi_device_dir(device));
1283 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1284 acpi_device_dir(device));
1285 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1286 acpi_device_dir(device));
1287 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1288 acpi_device_dir(device));
1289 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1290 acpi_device_dir(device));
1291 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1292 acpi_device_dir(device) = NULL;
1293 }
1294
1295 return 0;
1296 }
1297
1298 /* --------------------------------------------------------------------------
1299 Driver Interface
1300 -------------------------------------------------------------------------- */
1301
1302 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
1303 {
1304 struct acpi_thermal *tz = acpi_driver_data(device);
1305
1306
1307 if (!tz)
1308 return;
1309
1310 switch (event) {
1311 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1312 acpi_thermal_check(tz);
1313 break;
1314 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1315 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1316 acpi_thermal_check(tz);
1317 acpi_bus_generate_proc_event(device, event, 0);
1318 acpi_bus_generate_netlink_event(device->pnp.device_class,
1319 dev_name(&device->dev), event, 0);
1320 break;
1321 case ACPI_THERMAL_NOTIFY_DEVICES:
1322 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1323 acpi_thermal_check(tz);
1324 acpi_bus_generate_proc_event(device, event, 0);
1325 acpi_bus_generate_netlink_event(device->pnp.device_class,
1326 dev_name(&device->dev), event, 0);
1327 break;
1328 default:
1329 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1330 "Unsupported event [0x%x]\n", event));
1331 break;
1332 }
1333 }
1334
1335 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1336 {
1337 int result = 0;
1338
1339
1340 if (!tz)
1341 return -EINVAL;
1342
1343 /* Get temperature [_TMP] (required) */
1344 result = acpi_thermal_get_temperature(tz);
1345 if (result)
1346 return result;
1347
1348 /* Get trip points [_CRT, _PSV, etc.] (required) */
1349 result = acpi_thermal_get_trip_points(tz);
1350 if (result)
1351 return result;
1352
1353 /* Set the cooling mode [_SCP] to active cooling (default) */
1354 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1355 if (!result)
1356 tz->flags.cooling_mode = 1;
1357
1358 /* Get default polling frequency [_TZP] (optional) */
1359 if (tzp)
1360 tz->polling_frequency = tzp;
1361 else
1362 acpi_thermal_get_polling_frequency(tz);
1363
1364 return 0;
1365 }
1366
1367 /*
1368 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1369 * handles temperature values with a single decimal place. As a consequence,
1370 * some implementations use an offset of 273.1 and others use an offset of
1371 * 273.2. Try to find out which one is being used, to present the most
1372 * accurate and visually appealing number.
1373 *
1374 * The heuristic below should work for all ACPI thermal zones which have a
1375 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1376 */
1377 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1378 {
1379 if (tz->trips.critical.flags.valid &&
1380 (tz->trips.critical.temperature % 5) == 1)
1381 tz->kelvin_offset = 2731;
1382 else
1383 tz->kelvin_offset = 2732;
1384 }
1385
1386 static int acpi_thermal_add(struct acpi_device *device)
1387 {
1388 int result = 0;
1389 struct acpi_thermal *tz = NULL;
1390
1391
1392 if (!device)
1393 return -EINVAL;
1394
1395 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1396 if (!tz)
1397 return -ENOMEM;
1398
1399 tz->device = device;
1400 strcpy(tz->name, device->pnp.bus_id);
1401 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1402 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1403 device->driver_data = tz;
1404 mutex_init(&tz->lock);
1405
1406
1407 result = acpi_thermal_get_info(tz);
1408 if (result)
1409 goto free_memory;
1410
1411 acpi_thermal_guess_offset(tz);
1412
1413 result = acpi_thermal_register_thermal_zone(tz);
1414 if (result)
1415 goto free_memory;
1416
1417 result = acpi_thermal_add_fs(device);
1418 if (result)
1419 goto unregister_thermal_zone;
1420
1421 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1422 acpi_device_name(device), acpi_device_bid(device),
1423 KELVIN_TO_CELSIUS(tz->temperature));
1424 goto end;
1425
1426 unregister_thermal_zone:
1427 thermal_zone_device_unregister(tz->thermal_zone);
1428 free_memory:
1429 kfree(tz);
1430 end:
1431 return result;
1432 }
1433
1434 static int acpi_thermal_remove(struct acpi_device *device, int type)
1435 {
1436 struct acpi_thermal *tz = NULL;
1437
1438 if (!device || !acpi_driver_data(device))
1439 return -EINVAL;
1440
1441 tz = acpi_driver_data(device);
1442
1443 acpi_thermal_remove_fs(device);
1444 acpi_thermal_unregister_thermal_zone(tz);
1445 mutex_destroy(&tz->lock);
1446 kfree(tz);
1447 return 0;
1448 }
1449
1450 static int acpi_thermal_resume(struct acpi_device *device)
1451 {
1452 struct acpi_thermal *tz = NULL;
1453 int i, j, power_state, result;
1454
1455
1456 if (!device || !acpi_driver_data(device))
1457 return -EINVAL;
1458
1459 tz = acpi_driver_data(device);
1460
1461 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1462 if (!(&tz->trips.active[i]))
1463 break;
1464 if (!tz->trips.active[i].flags.valid)
1465 break;
1466 tz->trips.active[i].flags.enabled = 1;
1467 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1468 result = acpi_bus_get_power(tz->trips.active[i].devices.
1469 handles[j], &power_state);
1470 if (result || (power_state != ACPI_STATE_D0)) {
1471 tz->trips.active[i].flags.enabled = 0;
1472 break;
1473 }
1474 }
1475 tz->state.active |= tz->trips.active[i].flags.enabled;
1476 }
1477
1478 acpi_thermal_check(tz);
1479
1480 return AE_OK;
1481 }
1482
1483 static int thermal_act(const struct dmi_system_id *d) {
1484
1485 if (act == 0) {
1486 printk(KERN_NOTICE "ACPI: %s detected: "
1487 "disabling all active thermal trip points\n", d->ident);
1488 act = -1;
1489 }
1490 return 0;
1491 }
1492 static int thermal_nocrt(const struct dmi_system_id *d) {
1493
1494 printk(KERN_NOTICE "ACPI: %s detected: "
1495 "disabling all critical thermal trip point actions.\n", d->ident);
1496 nocrt = 1;
1497 return 0;
1498 }
1499 static int thermal_tzp(const struct dmi_system_id *d) {
1500
1501 if (tzp == 0) {
1502 printk(KERN_NOTICE "ACPI: %s detected: "
1503 "enabling thermal zone polling\n", d->ident);
1504 tzp = 300; /* 300 dS = 30 Seconds */
1505 }
1506 return 0;
1507 }
1508 static int thermal_psv(const struct dmi_system_id *d) {
1509
1510 if (psv == 0) {
1511 printk(KERN_NOTICE "ACPI: %s detected: "
1512 "disabling all passive thermal trip points\n", d->ident);
1513 psv = -1;
1514 }
1515 return 0;
1516 }
1517
1518 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1519 /*
1520 * Award BIOS on this AOpen makes thermal control almost worthless.
1521 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1522 */
1523 {
1524 .callback = thermal_act,
1525 .ident = "AOpen i915GMm-HFS",
1526 .matches = {
1527 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1528 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1529 },
1530 },
1531 {
1532 .callback = thermal_psv,
1533 .ident = "AOpen i915GMm-HFS",
1534 .matches = {
1535 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1536 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1537 },
1538 },
1539 {
1540 .callback = thermal_tzp,
1541 .ident = "AOpen i915GMm-HFS",
1542 .matches = {
1543 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1544 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1545 },
1546 },
1547 {
1548 .callback = thermal_nocrt,
1549 .ident = "Gigabyte GA-7ZX",
1550 .matches = {
1551 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1552 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1553 },
1554 },
1555 {}
1556 };
1557
1558 static int __init acpi_thermal_init(void)
1559 {
1560 int result = 0;
1561
1562 dmi_check_system(thermal_dmi_table);
1563
1564 if (off) {
1565 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1566 return -ENODEV;
1567 }
1568 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1569 if (!acpi_thermal_dir)
1570 return -ENODEV;
1571
1572 result = acpi_bus_register_driver(&acpi_thermal_driver);
1573 if (result < 0) {
1574 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1575 return -ENODEV;
1576 }
1577
1578 return 0;
1579 }
1580
1581 static void __exit acpi_thermal_exit(void)
1582 {
1583
1584 acpi_bus_unregister_driver(&acpi_thermal_driver);
1585
1586 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1587
1588 return;
1589 }
1590
1591 module_init(acpi_thermal_init);
1592 module_exit(acpi_thermal_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree