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USB: fix the clear_tt_buffer interface
[linux-2.6/mini2440.git] / drivers / acpi / thermal.c
blob564ea14242880f161cdea6a3aec51967b923427b
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 ACPI_THERMAL_CLASS "thermal_zone"
51 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
52 #define ACPI_THERMAL_FILE_STATE "state"
53 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
54 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
55 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
56 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
57 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
58 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
59 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82
60 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
61 #define ACPI_THERMAL_NOTIFY_HOT 0xF1
62 #define ACPI_THERMAL_MODE_ACTIVE 0x00
63
64 #define ACPI_THERMAL_MAX_ACTIVE 10
65 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
66
67 #define _COMPONENT ACPI_THERMAL_COMPONENT
68 ACPI_MODULE_NAME("thermal");
69
70 MODULE_AUTHOR("Paul Diefenbaugh");
71 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
72 MODULE_LICENSE("GPL");
73
74 static int act;
75 module_param(act, int, 0644);
76 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
77
78 static int crt;
79 module_param(crt, int, 0644);
80 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
81
82 static int tzp;
83 module_param(tzp, int, 0444);
84 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
85
86 static int nocrt;
87 module_param(nocrt, int, 0);
88 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
89
90 static int off;
91 module_param(off, int, 0);
92 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
93
94 static int psv;
95 module_param(psv, int, 0644);
96 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
97
98 static int acpi_thermal_add(struct acpi_device *device);
99 static int acpi_thermal_remove(struct acpi_device *device, int type);
100 static int acpi_thermal_resume(struct acpi_device *device);
101 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
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 .notify = acpi_thermal_notify,
128 },
129 };
130
131 struct acpi_thermal_state {
132 u8 critical:1;
133 u8 hot:1;
134 u8 passive:1;
135 u8 active:1;
136 u8 reserved:4;
137 int active_index;
138 };
139
140 struct acpi_thermal_state_flags {
141 u8 valid:1;
142 u8 enabled:1;
143 u8 reserved:6;
144 };
145
146 struct acpi_thermal_critical {
147 struct acpi_thermal_state_flags flags;
148 unsigned long temperature;
149 };
150
151 struct acpi_thermal_hot {
152 struct acpi_thermal_state_flags flags;
153 unsigned long temperature;
154 };
155
156 struct acpi_thermal_passive {
157 struct acpi_thermal_state_flags flags;
158 unsigned long temperature;
159 unsigned long tc1;
160 unsigned long tc2;
161 unsigned long tsp;
162 struct acpi_handle_list devices;
163 };
164
165 struct acpi_thermal_active {
166 struct acpi_thermal_state_flags flags;
167 unsigned long temperature;
168 struct acpi_handle_list devices;
169 };
170
171 struct acpi_thermal_trips {
172 struct acpi_thermal_critical critical;
173 struct acpi_thermal_hot hot;
174 struct acpi_thermal_passive passive;
175 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
176 };
177
178 struct acpi_thermal_flags {
179 u8 cooling_mode:1; /* _SCP */
180 u8 devices:1; /* _TZD */
181 u8 reserved:6;
182 };
183
184 struct acpi_thermal {
185 struct acpi_device * device;
186 acpi_bus_id name;
187 unsigned long temperature;
188 unsigned long last_temperature;
189 unsigned long polling_frequency;
190 volatile u8 zombie;
191 struct acpi_thermal_flags flags;
192 struct acpi_thermal_state state;
193 struct acpi_thermal_trips trips;
194 struct acpi_handle_list devices;
195 struct thermal_zone_device *thermal_zone;
196 int tz_enabled;
197 int kelvin_offset;
198 struct mutex lock;
199 };
200
201 static const struct file_operations acpi_thermal_state_fops = {
202 .owner = THIS_MODULE,
203 .open = acpi_thermal_state_open_fs,
204 .read = seq_read,
205 .llseek = seq_lseek,
206 .release = single_release,
207 };
208
209 static const struct file_operations acpi_thermal_temp_fops = {
210 .owner = THIS_MODULE,
211 .open = acpi_thermal_temp_open_fs,
212 .read = seq_read,
213 .llseek = seq_lseek,
214 .release = single_release,
215 };
216
217 static const struct file_operations acpi_thermal_trip_fops = {
218 .owner = THIS_MODULE,
219 .open = acpi_thermal_trip_open_fs,
220 .read = seq_read,
221 .llseek = seq_lseek,
222 .release = single_release,
223 };
224
225 static const struct file_operations acpi_thermal_cooling_fops = {
226 .owner = THIS_MODULE,
227 .open = acpi_thermal_cooling_open_fs,
228 .read = seq_read,
229 .write = acpi_thermal_write_cooling_mode,
230 .llseek = seq_lseek,
231 .release = single_release,
232 };
233
234 static const struct file_operations acpi_thermal_polling_fops = {
235 .owner = THIS_MODULE,
236 .open = acpi_thermal_polling_open_fs,
237 .read = seq_read,
238 .write = acpi_thermal_write_polling,
239 .llseek = seq_lseek,
240 .release = single_release,
241 };
242
243 /* --------------------------------------------------------------------------
244 Thermal Zone Management
245 -------------------------------------------------------------------------- */
246
247 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
248 {
249 acpi_status status = AE_OK;
250 unsigned long long tmp;
251
252 if (!tz)
253 return -EINVAL;
254
255 tz->last_temperature = tz->temperature;
256
257 status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
258 if (ACPI_FAILURE(status))
259 return -ENODEV;
260
261 tz->temperature = tmp;
262 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
263 tz->temperature));
264
265 return 0;
266 }
267
268 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
269 {
270 acpi_status status = AE_OK;
271 unsigned long long tmp;
272
273 if (!tz)
274 return -EINVAL;
275
276 status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
277 if (ACPI_FAILURE(status))
278 return -ENODEV;
279
280 tz->polling_frequency = tmp;
281 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
282 tz->polling_frequency));
283
284 return 0;
285 }
286
287 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
288 {
289
290 if (!tz)
291 return -EINVAL;
292
293 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */
294
295 tz->thermal_zone->polling_delay = seconds * 1000;
296
297 if (tz->tz_enabled)
298 thermal_zone_device_update(tz->thermal_zone);
299
300 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
301 "Polling frequency set to %lu seconds\n",
302 tz->polling_frequency/10));
303
304 return 0;
305 }
306
307 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
308 {
309 acpi_status status = AE_OK;
310 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
311 struct acpi_object_list arg_list = { 1, &arg0 };
312 acpi_handle handle = NULL;
313
314
315 if (!tz)
316 return -EINVAL;
317
318 status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
319 if (ACPI_FAILURE(status)) {
320 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
321 return -ENODEV;
322 }
323
324 arg0.integer.value = mode;
325
326 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
327 if (ACPI_FAILURE(status))
328 return -ENODEV;
329
330 return 0;
331 }
332
333 #define ACPI_TRIPS_CRITICAL 0x01
334 #define ACPI_TRIPS_HOT 0x02
335 #define ACPI_TRIPS_PASSIVE 0x04
336 #define ACPI_TRIPS_ACTIVE 0x08
337 #define ACPI_TRIPS_DEVICES 0x10
338
339 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
340 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
341
342 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
343 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
344 ACPI_TRIPS_DEVICES)
345
346 /*
347 * This exception is thrown out in two cases:
348 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
349 * when re-evaluating the AML code.
350 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
351 * We need to re-bind the cooling devices of a thermal zone when this occurs.
352 */
353 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
354 do { \
355 if (flags != ACPI_TRIPS_INIT) \
356 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
357 "ACPI thermal trip point %s changed\n" \
358 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
359 } while (0)
360
361 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
362 {
363 acpi_status status = AE_OK;
364 unsigned long long tmp;
365 struct acpi_handle_list devices;
366 int valid = 0;
367 int i;
368
369 /* Critical Shutdown (required) */
370 if (flag & ACPI_TRIPS_CRITICAL) {
371 status = acpi_evaluate_integer(tz->device->handle,
372 "_CRT", NULL, &tmp);
373 tz->trips.critical.temperature = tmp;
374 /*
375 * Treat freezing temperatures as invalid as well; some
376 * BIOSes return really low values and cause reboots at startup.
377 * Below zero (Celsius) values clearly aren't right for sure..
378 * ... so lets discard those as invalid.
379 */
380 if (ACPI_FAILURE(status) ||
381 tz->trips.critical.temperature <= 2732) {
382 tz->trips.critical.flags.valid = 0;
383 ACPI_EXCEPTION((AE_INFO, status,
384 "No or invalid critical threshold"));
385 return -ENODEV;
386 } else {
387 tz->trips.critical.flags.valid = 1;
388 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
389 "Found critical threshold [%lu]\n",
390 tz->trips.critical.temperature));
391 }
392 if (tz->trips.critical.flags.valid == 1) {
393 if (crt == -1) {
394 tz->trips.critical.flags.valid = 0;
395 } else if (crt > 0) {
396 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
397 /*
398 * Allow override critical threshold
399 */
400 if (crt_k > tz->trips.critical.temperature)
401 printk(KERN_WARNING PREFIX
402 "Critical threshold %d C\n", crt);
403 tz->trips.critical.temperature = crt_k;
404 }
405 }
406 }
407
408 /* Critical Sleep (optional) */
409 if (flag & ACPI_TRIPS_HOT) {
410 status = acpi_evaluate_integer(tz->device->handle,
411 "_HOT", NULL, &tmp);
412 if (ACPI_FAILURE(status)) {
413 tz->trips.hot.flags.valid = 0;
414 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
415 "No hot threshold\n"));
416 } else {
417 tz->trips.hot.temperature = tmp;
418 tz->trips.hot.flags.valid = 1;
419 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
420 "Found hot threshold [%lu]\n",
421 tz->trips.critical.temperature));
422 }
423 }
424
425 /* Passive (optional) */
426 if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
427 (flag == ACPI_TRIPS_INIT)) {
428 valid = tz->trips.passive.flags.valid;
429 if (psv == -1) {
430 status = AE_SUPPORT;
431 } else if (psv > 0) {
432 tmp = CELSIUS_TO_KELVIN(psv);
433 status = AE_OK;
434 } else {
435 status = acpi_evaluate_integer(tz->device->handle,
436 "_PSV", NULL, &tmp);
437 }
438
439 if (ACPI_FAILURE(status))
440 tz->trips.passive.flags.valid = 0;
441 else {
442 tz->trips.passive.temperature = tmp;
443 tz->trips.passive.flags.valid = 1;
444 if (flag == ACPI_TRIPS_INIT) {
445 status = acpi_evaluate_integer(
446 tz->device->handle, "_TC1",
447 NULL, &tmp);
448 if (ACPI_FAILURE(status))
449 tz->trips.passive.flags.valid = 0;
450 else
451 tz->trips.passive.tc1 = tmp;
452 status = acpi_evaluate_integer(
453 tz->device->handle, "_TC2",
454 NULL, &tmp);
455 if (ACPI_FAILURE(status))
456 tz->trips.passive.flags.valid = 0;
457 else
458 tz->trips.passive.tc2 = tmp;
459 status = acpi_evaluate_integer(
460 tz->device->handle, "_TSP",
461 NULL, &tmp);
462 if (ACPI_FAILURE(status))
463 tz->trips.passive.flags.valid = 0;
464 else
465 tz->trips.passive.tsp = tmp;
466 }
467 }
468 }
469 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
470 memset(&devices, 0, sizeof(struct acpi_handle_list));
471 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
472 NULL, &devices);
473 if (ACPI_FAILURE(status)) {
474 printk(KERN_WARNING PREFIX
475 "Invalid passive threshold\n");
476 tz->trips.passive.flags.valid = 0;
477 }
478 else
479 tz->trips.passive.flags.valid = 1;
480
481 if (memcmp(&tz->trips.passive.devices, &devices,
482 sizeof(struct acpi_handle_list))) {
483 memcpy(&tz->trips.passive.devices, &devices,
484 sizeof(struct acpi_handle_list));
485 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
486 }
487 }
488 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
489 if (valid != tz->trips.passive.flags.valid)
490 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
491 }
492
493 /* Active (optional) */
494 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
495 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
496 valid = tz->trips.active[i].flags.valid;
497
498 if (act == -1)
499 break; /* disable all active trip points */
500
501 if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
502 tz->trips.active[i].flags.valid)) {
503 status = acpi_evaluate_integer(tz->device->handle,
504 name, NULL, &tmp);
505 if (ACPI_FAILURE(status)) {
506 tz->trips.active[i].flags.valid = 0;
507 if (i == 0)
508 break;
509 if (act <= 0)
510 break;
511 if (i == 1)
512 tz->trips.active[0].temperature =
513 CELSIUS_TO_KELVIN(act);
514 else
515 /*
516 * Don't allow override higher than
517 * the next higher trip point
518 */
519 tz->trips.active[i - 1].temperature =
520 (tz->trips.active[i - 2].temperature <
521 CELSIUS_TO_KELVIN(act) ?
522 tz->trips.active[i - 2].temperature :
523 CELSIUS_TO_KELVIN(act));
524 break;
525 } else {
526 tz->trips.active[i].temperature = tmp;
527 tz->trips.active[i].flags.valid = 1;
528 }
529 }
530
531 name[2] = 'L';
532 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
533 memset(&devices, 0, sizeof(struct acpi_handle_list));
534 status = acpi_evaluate_reference(tz->device->handle,
535 name, NULL, &devices);
536 if (ACPI_FAILURE(status)) {
537 printk(KERN_WARNING PREFIX
538 "Invalid active%d threshold\n", i);
539 tz->trips.active[i].flags.valid = 0;
540 }
541 else
542 tz->trips.active[i].flags.valid = 1;
543
544 if (memcmp(&tz->trips.active[i].devices, &devices,
545 sizeof(struct acpi_handle_list))) {
546 memcpy(&tz->trips.active[i].devices, &devices,
547 sizeof(struct acpi_handle_list));
548 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
549 }
550 }
551 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
552 if (valid != tz->trips.active[i].flags.valid)
553 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
554
555 if (!tz->trips.active[i].flags.valid)
556 break;
557 }
558
559 if (flag & ACPI_TRIPS_DEVICES) {
560 memset(&devices, 0, sizeof(struct acpi_handle_list));
561 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
562 NULL, &devices);
563 if (memcmp(&tz->devices, &devices,
564 sizeof(struct acpi_handle_list))) {
565 memcpy(&tz->devices, &devices,
566 sizeof(struct acpi_handle_list));
567 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
568 }
569 }
570
571 return 0;
572 }
573
574 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
575 {
576 return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
577 }
578
579 static void acpi_thermal_check(void *data)
580 {
581 struct acpi_thermal *tz = data;
582
583 thermal_zone_device_update(tz->thermal_zone);
584 }
585
586 /* sys I/F for generic thermal sysfs support */
587 #define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
588
589 static int thermal_get_temp(struct thermal_zone_device *thermal,
590 unsigned long *temp)
591 {
592 struct acpi_thermal *tz = thermal->devdata;
593 int result;
594
595 if (!tz)
596 return -EINVAL;
597
598 result = acpi_thermal_get_temperature(tz);
599 if (result)
600 return result;
601
602 *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
603 return 0;
604 }
605
606 static const char enabled[] = "kernel";
607 static const char disabled[] = "user";
608 static int thermal_get_mode(struct thermal_zone_device *thermal,
609 enum thermal_device_mode *mode)
610 {
611 struct acpi_thermal *tz = thermal->devdata;
612
613 if (!tz)
614 return -EINVAL;
615
616 *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
617 THERMAL_DEVICE_DISABLED;
618
619 return 0;
620 }
621
622 static int thermal_set_mode(struct thermal_zone_device *thermal,
623 enum thermal_device_mode mode)
624 {
625 struct acpi_thermal *tz = thermal->devdata;
626 int enable;
627
628 if (!tz)
629 return -EINVAL;
630
631 /*
632 * enable/disable thermal management from ACPI thermal driver
633 */
634 if (mode == THERMAL_DEVICE_ENABLED)
635 enable = 1;
636 else if (mode == THERMAL_DEVICE_DISABLED)
637 enable = 0;
638 else
639 return -EINVAL;
640
641 if (enable != tz->tz_enabled) {
642 tz->tz_enabled = enable;
643 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
644 "%s ACPI thermal control\n",
645 tz->tz_enabled ? enabled : disabled));
646 acpi_thermal_check(tz);
647 }
648 return 0;
649 }
650
651 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
652 int trip, enum thermal_trip_type *type)
653 {
654 struct acpi_thermal *tz = thermal->devdata;
655 int i;
656
657 if (!tz || trip < 0)
658 return -EINVAL;
659
660 if (tz->trips.critical.flags.valid) {
661 if (!trip) {
662 *type = THERMAL_TRIP_CRITICAL;
663 return 0;
664 }
665 trip--;
666 }
667
668 if (tz->trips.hot.flags.valid) {
669 if (!trip) {
670 *type = THERMAL_TRIP_HOT;
671 return 0;
672 }
673 trip--;
674 }
675
676 if (tz->trips.passive.flags.valid) {
677 if (!trip) {
678 *type = THERMAL_TRIP_PASSIVE;
679 return 0;
680 }
681 trip--;
682 }
683
684 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
685 tz->trips.active[i].flags.valid; i++) {
686 if (!trip) {
687 *type = THERMAL_TRIP_ACTIVE;
688 return 0;
689 }
690 trip--;
691 }
692
693 return -EINVAL;
694 }
695
696 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
697 int trip, unsigned long *temp)
698 {
699 struct acpi_thermal *tz = thermal->devdata;
700 int i;
701
702 if (!tz || trip < 0)
703 return -EINVAL;
704
705 if (tz->trips.critical.flags.valid) {
706 if (!trip) {
707 *temp = KELVIN_TO_MILLICELSIUS(
708 tz->trips.critical.temperature,
709 tz->kelvin_offset);
710 return 0;
711 }
712 trip--;
713 }
714
715 if (tz->trips.hot.flags.valid) {
716 if (!trip) {
717 *temp = KELVIN_TO_MILLICELSIUS(
718 tz->trips.hot.temperature,
719 tz->kelvin_offset);
720 return 0;
721 }
722 trip--;
723 }
724
725 if (tz->trips.passive.flags.valid) {
726 if (!trip) {
727 *temp = KELVIN_TO_MILLICELSIUS(
728 tz->trips.passive.temperature,
729 tz->kelvin_offset);
730 return 0;
731 }
732 trip--;
733 }
734
735 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
736 tz->trips.active[i].flags.valid; i++) {
737 if (!trip) {
738 *temp = KELVIN_TO_MILLICELSIUS(
739 tz->trips.active[i].temperature,
740 tz->kelvin_offset);
741 return 0;
742 }
743 trip--;
744 }
745
746 return -EINVAL;
747 }
748
749 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
750 unsigned long *temperature) {
751 struct acpi_thermal *tz = thermal->devdata;
752
753 if (tz->trips.critical.flags.valid) {
754 *temperature = KELVIN_TO_MILLICELSIUS(
755 tz->trips.critical.temperature,
756 tz->kelvin_offset);
757 return 0;
758 } else
759 return -EINVAL;
760 }
761
762 static int thermal_notify(struct thermal_zone_device *thermal, int trip,
763 enum thermal_trip_type trip_type)
764 {
765 u8 type = 0;
766 struct acpi_thermal *tz = thermal->devdata;
767
768 if (trip_type == THERMAL_TRIP_CRITICAL)
769 type = ACPI_THERMAL_NOTIFY_CRITICAL;
770 else if (trip_type == THERMAL_TRIP_HOT)
771 type = ACPI_THERMAL_NOTIFY_HOT;
772 else
773 return 0;
774
775 acpi_bus_generate_proc_event(tz->device, type, 1);
776 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
777 dev_name(&tz->device->dev), type, 1);
778
779 if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
780 return 1;
781
782 return 0;
783 }
784
785 typedef int (*cb)(struct thermal_zone_device *, int,
786 struct thermal_cooling_device *);
787 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
788 struct thermal_cooling_device *cdev,
789 cb action)
790 {
791 struct acpi_device *device = cdev->devdata;
792 struct acpi_thermal *tz = thermal->devdata;
793 struct acpi_device *dev;
794 acpi_status status;
795 acpi_handle handle;
796 int i;
797 int j;
798 int trip = -1;
799 int result = 0;
800
801 if (tz->trips.critical.flags.valid)
802 trip++;
803
804 if (tz->trips.hot.flags.valid)
805 trip++;
806
807 if (tz->trips.passive.flags.valid) {
808 trip++;
809 for (i = 0; i < tz->trips.passive.devices.count;
810 i++) {
811 handle = tz->trips.passive.devices.handles[i];
812 status = acpi_bus_get_device(handle, &dev);
813 if (ACPI_SUCCESS(status) && (dev == device)) {
814 result = action(thermal, trip, cdev);
815 if (result)
816 goto failed;
817 }
818 }
819 }
820
821 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
822 if (!tz->trips.active[i].flags.valid)
823 break;
824 trip++;
825 for (j = 0;
826 j < tz->trips.active[i].devices.count;
827 j++) {
828 handle = tz->trips.active[i].devices.handles[j];
829 status = acpi_bus_get_device(handle, &dev);
830 if (ACPI_SUCCESS(status) && (dev == device)) {
831 result = action(thermal, trip, cdev);
832 if (result)
833 goto failed;
834 }
835 }
836 }
837
838 for (i = 0; i < tz->devices.count; i++) {
839 handle = tz->devices.handles[i];
840 status = acpi_bus_get_device(handle, &dev);
841 if (ACPI_SUCCESS(status) && (dev == device)) {
842 result = action(thermal, -1, cdev);
843 if (result)
844 goto failed;
845 }
846 }
847
848 failed:
849 return result;
850 }
851
852 static int
853 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
854 struct thermal_cooling_device *cdev)
855 {
856 return acpi_thermal_cooling_device_cb(thermal, cdev,
857 thermal_zone_bind_cooling_device);
858 }
859
860 static int
861 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
862 struct thermal_cooling_device *cdev)
863 {
864 return acpi_thermal_cooling_device_cb(thermal, cdev,
865 thermal_zone_unbind_cooling_device);
866 }
867
868 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
869 .bind = acpi_thermal_bind_cooling_device,
870 .unbind = acpi_thermal_unbind_cooling_device,
871 .get_temp = thermal_get_temp,
872 .get_mode = thermal_get_mode,
873 .set_mode = thermal_set_mode,
874 .get_trip_type = thermal_get_trip_type,
875 .get_trip_temp = thermal_get_trip_temp,
876 .get_crit_temp = thermal_get_crit_temp,
877 .notify = thermal_notify,
878 };
879
880 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
881 {
882 int trips = 0;
883 int result;
884 acpi_status status;
885 int i;
886
887 if (tz->trips.critical.flags.valid)
888 trips++;
889
890 if (tz->trips.hot.flags.valid)
891 trips++;
892
893 if (tz->trips.passive.flags.valid)
894 trips++;
895
896 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
897 tz->trips.active[i].flags.valid; i++, trips++);
898
899 if (tz->trips.passive.flags.valid)
900 tz->thermal_zone =
901 thermal_zone_device_register("acpitz", trips, tz,
902 &acpi_thermal_zone_ops,
903 tz->trips.passive.tc1,
904 tz->trips.passive.tc2,
905 tz->trips.passive.tsp*100,
906 tz->polling_frequency*100);
907 else
908 tz->thermal_zone =
909 thermal_zone_device_register("acpitz", trips, tz,
910 &acpi_thermal_zone_ops,
911 0, 0, 0,
912 tz->polling_frequency*100);
913 if (IS_ERR(tz->thermal_zone))
914 return -ENODEV;
915
916 result = sysfs_create_link(&tz->device->dev.kobj,
917 &tz->thermal_zone->device.kobj, "thermal_zone");
918 if (result)
919 return result;
920
921 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
922 &tz->device->dev.kobj, "device");
923 if (result)
924 return result;
925
926 status = acpi_attach_data(tz->device->handle,
927 acpi_bus_private_data_handler,
928 tz->thermal_zone);
929 if (ACPI_FAILURE(status)) {
930 printk(KERN_ERR PREFIX
931 "Error attaching device data\n");
932 return -ENODEV;
933 }
934
935 tz->tz_enabled = 1;
936
937 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
938 tz->thermal_zone->id);
939 return 0;
940 }
941
942 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
943 {
944 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
945 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
946 thermal_zone_device_unregister(tz->thermal_zone);
947 tz->thermal_zone = NULL;
948 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
949 }
950
951
952 /* --------------------------------------------------------------------------
953 FS Interface (/proc)
954 -------------------------------------------------------------------------- */
955
956 static struct proc_dir_entry *acpi_thermal_dir;
957
958 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
959 {
960 struct acpi_thermal *tz = seq->private;
961
962
963 if (!tz)
964 goto end;
965
966 seq_puts(seq, "state: ");
967
968 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
969 && !tz->state.active)
970 seq_puts(seq, "ok\n");
971 else {
972 if (tz->state.critical)
973 seq_puts(seq, "critical ");
974 if (tz->state.hot)
975 seq_puts(seq, "hot ");
976 if (tz->state.passive)
977 seq_puts(seq, "passive ");
978 if (tz->state.active)
979 seq_printf(seq, "active[%d]", tz->state.active_index);
980 seq_puts(seq, "\n");
981 }
982
983 end:
984 return 0;
985 }
986
987 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
988 {
989 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
990 }
991
992 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
993 {
994 int result = 0;
995 struct acpi_thermal *tz = seq->private;
996
997
998 if (!tz)
999 goto end;
1000
1001 result = acpi_thermal_get_temperature(tz);
1002 if (result)
1003 goto end;
1004
1005 seq_printf(seq, "temperature: %ld C\n",
1006 KELVIN_TO_CELSIUS(tz->temperature));
1007
1008 end:
1009 return 0;
1010 }
1011
1012 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1013 {
1014 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1015 }
1016
1017 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1018 {
1019 struct acpi_thermal *tz = seq->private;
1020 struct acpi_device *device;
1021 acpi_status status;
1022
1023 int i = 0;
1024 int j = 0;
1025
1026
1027 if (!tz)
1028 goto end;
1029
1030 if (tz->trips.critical.flags.valid)
1031 seq_printf(seq, "critical (S5): %ld C%s",
1032 KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1033 nocrt ? " <disabled>\n" : "\n");
1034
1035 if (tz->trips.hot.flags.valid)
1036 seq_printf(seq, "hot (S4): %ld C%s",
1037 KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1038 nocrt ? " <disabled>\n" : "\n");
1039
1040 if (tz->trips.passive.flags.valid) {
1041 seq_printf(seq,
1042 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1043 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1044 tz->trips.passive.tc1, tz->trips.passive.tc2,
1045 tz->trips.passive.tsp);
1046 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1047 status = acpi_bus_get_device(tz->trips.passive.devices.
1048 handles[j], &device);
1049 seq_printf(seq, "%4.4s ", status ? "" :
1050 acpi_device_bid(device));
1051 }
1052 seq_puts(seq, "\n");
1053 }
1054
1055 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1056 if (!(tz->trips.active[i].flags.valid))
1057 break;
1058 seq_printf(seq, "active[%d]: %ld C: devices=",
1059 i,
1060 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1061 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1062 status = acpi_bus_get_device(tz->trips.active[i].
1063 devices.handles[j],
1064 &device);
1065 seq_printf(seq, "%4.4s ", status ? "" :
1066 acpi_device_bid(device));
1067 }
1068 seq_puts(seq, "\n");
1069 }
1070
1071 end:
1072 return 0;
1073 }
1074
1075 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1076 {
1077 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1078 }
1079
1080 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1081 {
1082 struct acpi_thermal *tz = seq->private;
1083
1084
1085 if (!tz)
1086 goto end;
1087
1088 if (!tz->flags.cooling_mode)
1089 seq_puts(seq, "<setting not supported>\n");
1090 else
1091 seq_puts(seq, "0 - Active; 1 - Passive\n");
1092
1093 end:
1094 return 0;
1095 }
1096
1097 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1098 {
1099 return single_open(file, acpi_thermal_cooling_seq_show,
1100 PDE(inode)->data);
1101 }
1102
1103 static ssize_t
1104 acpi_thermal_write_cooling_mode(struct file *file,
1105 const char __user * buffer,
1106 size_t count, loff_t * ppos)
1107 {
1108 struct seq_file *m = file->private_data;
1109 struct acpi_thermal *tz = m->private;
1110 int result = 0;
1111 char mode_string[12] = { '\0' };
1112
1113
1114 if (!tz || (count > sizeof(mode_string) - 1))
1115 return -EINVAL;
1116
1117 if (!tz->flags.cooling_mode)
1118 return -ENODEV;
1119
1120 if (copy_from_user(mode_string, buffer, count))
1121 return -EFAULT;
1122
1123 mode_string[count] = '\0';
1124
1125 result = acpi_thermal_set_cooling_mode(tz,
1126 simple_strtoul(mode_string, NULL,
1127 0));
1128 if (result)
1129 return result;
1130
1131 acpi_thermal_check(tz);
1132
1133 return count;
1134 }
1135
1136 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1137 {
1138 struct acpi_thermal *tz = seq->private;
1139
1140
1141 if (!tz)
1142 goto end;
1143
1144 if (!tz->thermal_zone->polling_delay) {
1145 seq_puts(seq, "<polling disabled>\n");
1146 goto end;
1147 }
1148
1149 seq_printf(seq, "polling frequency: %d seconds\n",
1150 (tz->thermal_zone->polling_delay / 1000));
1151
1152 end:
1153 return 0;
1154 }
1155
1156 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1157 {
1158 return single_open(file, acpi_thermal_polling_seq_show,
1159 PDE(inode)->data);
1160 }
1161
1162 static ssize_t
1163 acpi_thermal_write_polling(struct file *file,
1164 const char __user * buffer,
1165 size_t count, loff_t * ppos)
1166 {
1167 struct seq_file *m = file->private_data;
1168 struct acpi_thermal *tz = m->private;
1169 int result = 0;
1170 char polling_string[12] = { '\0' };
1171 int seconds = 0;
1172
1173
1174 if (!tz || (count > sizeof(polling_string) - 1))
1175 return -EINVAL;
1176
1177 if (copy_from_user(polling_string, buffer, count))
1178 return -EFAULT;
1179
1180 polling_string[count] = '\0';
1181
1182 seconds = simple_strtoul(polling_string, NULL, 0);
1183
1184 result = acpi_thermal_set_polling(tz, seconds);
1185 if (result)
1186 return result;
1187
1188 acpi_thermal_check(tz);
1189
1190 return count;
1191 }
1192
1193 static int acpi_thermal_add_fs(struct acpi_device *device)
1194 {
1195 struct proc_dir_entry *entry = NULL;
1196
1197
1198 if (!acpi_device_dir(device)) {
1199 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1200 acpi_thermal_dir);
1201 if (!acpi_device_dir(device))
1202 return -ENODEV;
1203 }
1204
1205 /* 'state' [R] */
1206 entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1207 S_IRUGO, acpi_device_dir(device),
1208 &acpi_thermal_state_fops,
1209 acpi_driver_data(device));
1210 if (!entry)
1211 return -ENODEV;
1212
1213 /* 'temperature' [R] */
1214 entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1215 S_IRUGO, acpi_device_dir(device),
1216 &acpi_thermal_temp_fops,
1217 acpi_driver_data(device));
1218 if (!entry)
1219 return -ENODEV;
1220
1221 /* 'trip_points' [R] */
1222 entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1223 S_IRUGO,
1224 acpi_device_dir(device),
1225 &acpi_thermal_trip_fops,
1226 acpi_driver_data(device));
1227 if (!entry)
1228 return -ENODEV;
1229
1230 /* 'cooling_mode' [R/W] */
1231 entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1232 S_IFREG | S_IRUGO | S_IWUSR,
1233 acpi_device_dir(device),
1234 &acpi_thermal_cooling_fops,
1235 acpi_driver_data(device));
1236 if (!entry)
1237 return -ENODEV;
1238
1239 /* 'polling_frequency' [R/W] */
1240 entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1241 S_IFREG | S_IRUGO | S_IWUSR,
1242 acpi_device_dir(device),
1243 &acpi_thermal_polling_fops,
1244 acpi_driver_data(device));
1245 if (!entry)
1246 return -ENODEV;
1247 return 0;
1248 }
1249
1250 static int acpi_thermal_remove_fs(struct acpi_device *device)
1251 {
1252
1253 if (acpi_device_dir(device)) {
1254 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1255 acpi_device_dir(device));
1256 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1257 acpi_device_dir(device));
1258 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1259 acpi_device_dir(device));
1260 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1261 acpi_device_dir(device));
1262 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1263 acpi_device_dir(device));
1264 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1265 acpi_device_dir(device) = NULL;
1266 }
1267
1268 return 0;
1269 }
1270
1271 /* --------------------------------------------------------------------------
1272 Driver Interface
1273 -------------------------------------------------------------------------- */
1274
1275 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
1276 {
1277 struct acpi_thermal *tz = acpi_driver_data(device);
1278
1279
1280 if (!tz)
1281 return;
1282
1283 switch (event) {
1284 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1285 acpi_thermal_check(tz);
1286 break;
1287 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1288 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1289 acpi_thermal_check(tz);
1290 acpi_bus_generate_proc_event(device, event, 0);
1291 acpi_bus_generate_netlink_event(device->pnp.device_class,
1292 dev_name(&device->dev), event, 0);
1293 break;
1294 case ACPI_THERMAL_NOTIFY_DEVICES:
1295 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1296 acpi_thermal_check(tz);
1297 acpi_bus_generate_proc_event(device, event, 0);
1298 acpi_bus_generate_netlink_event(device->pnp.device_class,
1299 dev_name(&device->dev), event, 0);
1300 break;
1301 default:
1302 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1303 "Unsupported event [0x%x]\n", event));
1304 break;
1305 }
1306 }
1307
1308 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1309 {
1310 int result = 0;
1311
1312
1313 if (!tz)
1314 return -EINVAL;
1315
1316 /* Get temperature [_TMP] (required) */
1317 result = acpi_thermal_get_temperature(tz);
1318 if (result)
1319 return result;
1320
1321 /* Get trip points [_CRT, _PSV, etc.] (required) */
1322 result = acpi_thermal_get_trip_points(tz);
1323 if (result)
1324 return result;
1325
1326 /* Set the cooling mode [_SCP] to active cooling (default) */
1327 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1328 if (!result)
1329 tz->flags.cooling_mode = 1;
1330
1331 /* Get default polling frequency [_TZP] (optional) */
1332 if (tzp)
1333 tz->polling_frequency = tzp;
1334 else
1335 acpi_thermal_get_polling_frequency(tz);
1336
1337 return 0;
1338 }
1339
1340 /*
1341 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1342 * handles temperature values with a single decimal place. As a consequence,
1343 * some implementations use an offset of 273.1 and others use an offset of
1344 * 273.2. Try to find out which one is being used, to present the most
1345 * accurate and visually appealing number.
1346 *
1347 * The heuristic below should work for all ACPI thermal zones which have a
1348 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1349 */
1350 static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1351 {
1352 if (tz->trips.critical.flags.valid &&
1353 (tz->trips.critical.temperature % 5) == 1)
1354 tz->kelvin_offset = 2731;
1355 else
1356 tz->kelvin_offset = 2732;
1357 }
1358
1359 static int acpi_thermal_add(struct acpi_device *device)
1360 {
1361 int result = 0;
1362 struct acpi_thermal *tz = NULL;
1363
1364
1365 if (!device)
1366 return -EINVAL;
1367
1368 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1369 if (!tz)
1370 return -ENOMEM;
1371
1372 tz->device = device;
1373 strcpy(tz->name, device->pnp.bus_id);
1374 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1375 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1376 device->driver_data = tz;
1377 mutex_init(&tz->lock);
1378
1379
1380 result = acpi_thermal_get_info(tz);
1381 if (result)
1382 goto free_memory;
1383
1384 acpi_thermal_guess_offset(tz);
1385
1386 result = acpi_thermal_register_thermal_zone(tz);
1387 if (result)
1388 goto free_memory;
1389
1390 result = acpi_thermal_add_fs(device);
1391 if (result)
1392 goto unregister_thermal_zone;
1393
1394 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1395 acpi_device_name(device), acpi_device_bid(device),
1396 KELVIN_TO_CELSIUS(tz->temperature));
1397 goto end;
1398
1399 unregister_thermal_zone:
1400 thermal_zone_device_unregister(tz->thermal_zone);
1401 free_memory:
1402 kfree(tz);
1403 end:
1404 return result;
1405 }
1406
1407 static int acpi_thermal_remove(struct acpi_device *device, int type)
1408 {
1409 struct acpi_thermal *tz = NULL;
1410
1411 if (!device || !acpi_driver_data(device))
1412 return -EINVAL;
1413
1414 tz = acpi_driver_data(device);
1415
1416 acpi_thermal_remove_fs(device);
1417 acpi_thermal_unregister_thermal_zone(tz);
1418 mutex_destroy(&tz->lock);
1419 kfree(tz);
1420 return 0;
1421 }
1422
1423 static int acpi_thermal_resume(struct acpi_device *device)
1424 {
1425 struct acpi_thermal *tz = NULL;
1426 int i, j, power_state, result;
1427
1428
1429 if (!device || !acpi_driver_data(device))
1430 return -EINVAL;
1431
1432 tz = acpi_driver_data(device);
1433
1434 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1435 if (!(&tz->trips.active[i]))
1436 break;
1437 if (!tz->trips.active[i].flags.valid)
1438 break;
1439 tz->trips.active[i].flags.enabled = 1;
1440 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1441 result = acpi_bus_get_power(tz->trips.active[i].devices.
1442 handles[j], &power_state);
1443 if (result || (power_state != ACPI_STATE_D0)) {
1444 tz->trips.active[i].flags.enabled = 0;
1445 break;
1446 }
1447 }
1448 tz->state.active |= tz->trips.active[i].flags.enabled;
1449 }
1450
1451 acpi_thermal_check(tz);
1452
1453 return AE_OK;
1454 }
1455
1456 static int thermal_act(const struct dmi_system_id *d) {
1457
1458 if (act == 0) {
1459 printk(KERN_NOTICE "ACPI: %s detected: "
1460 "disabling all active thermal trip points\n", d->ident);
1461 act = -1;
1462 }
1463 return 0;
1464 }
1465 static int thermal_nocrt(const struct dmi_system_id *d) {
1466
1467 printk(KERN_NOTICE "ACPI: %s detected: "
1468 "disabling all critical thermal trip point actions.\n", d->ident);
1469 nocrt = 1;
1470 return 0;
1471 }
1472 static int thermal_tzp(const struct dmi_system_id *d) {
1473
1474 if (tzp == 0) {
1475 printk(KERN_NOTICE "ACPI: %s detected: "
1476 "enabling thermal zone polling\n", d->ident);
1477 tzp = 300; /* 300 dS = 30 Seconds */
1478 }
1479 return 0;
1480 }
1481 static int thermal_psv(const struct dmi_system_id *d) {
1482
1483 if (psv == 0) {
1484 printk(KERN_NOTICE "ACPI: %s detected: "
1485 "disabling all passive thermal trip points\n", d->ident);
1486 psv = -1;
1487 }
1488 return 0;
1489 }
1490
1491 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1492 /*
1493 * Award BIOS on this AOpen makes thermal control almost worthless.
1494 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1495 */
1496 {
1497 .callback = thermal_act,
1498 .ident = "AOpen i915GMm-HFS",
1499 .matches = {
1500 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1501 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1502 },
1503 },
1504 {
1505 .callback = thermal_psv,
1506 .ident = "AOpen i915GMm-HFS",
1507 .matches = {
1508 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1509 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1510 },
1511 },
1512 {
1513 .callback = thermal_tzp,
1514 .ident = "AOpen i915GMm-HFS",
1515 .matches = {
1516 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1517 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1518 },
1519 },
1520 {
1521 .callback = thermal_nocrt,
1522 .ident = "Gigabyte GA-7ZX",
1523 .matches = {
1524 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1525 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1526 },
1527 },
1528 {}
1529 };
1530
1531 static int __init acpi_thermal_init(void)
1532 {
1533 int result = 0;
1534
1535 dmi_check_system(thermal_dmi_table);
1536
1537 if (off) {
1538 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1539 return -ENODEV;
1540 }
1541 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1542 if (!acpi_thermal_dir)
1543 return -ENODEV;
1544
1545 result = acpi_bus_register_driver(&acpi_thermal_driver);
1546 if (result < 0) {
1547 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1548 return -ENODEV;
1549 }
1550
1551 return 0;
1552 }
1553
1554 static void __exit acpi_thermal_exit(void)
1555 {
1556
1557 acpi_bus_unregister_driver(&acpi_thermal_driver);
1558
1559 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1560
1561 return;
1562 }
1563
1564 module_init(acpi_thermal_init);
1565 module_exit(acpi_thermal_exit);
Support for the Chinese Samsung S3C2440 based development boards