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[deliverable/linux.git] / drivers / acpi / thermal.c
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/init.h>
37 #include <linux/types.h>
38 #include <linux/proc_fs.h>
39 #include <linux/sched.h>
40 #include <linux/kmod.h>
41 #include <linux/seq_file.h>
42 #include <asm/uaccess.h>
43
44 #include <acpi/acpi_bus.h>
45 #include <acpi/acpi_drivers.h>
46
47 #define ACPI_THERMAL_COMPONENT 0x04000000
48 #define ACPI_THERMAL_CLASS "thermal_zone"
49 #define ACPI_THERMAL_DRIVER_NAME "ACPI Thermal Zone Driver"
50 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
51 #define ACPI_THERMAL_FILE_STATE "state"
52 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
53 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
54 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
55 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
56 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
57 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
58 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82
59 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
60 #define ACPI_THERMAL_NOTIFY_HOT 0xF1
61 #define ACPI_THERMAL_MODE_ACTIVE 0x00
62 #define ACPI_THERMAL_MODE_PASSIVE 0x01
63 #define ACPI_THERMAL_MODE_CRITICAL 0xff
64 #define ACPI_THERMAL_PATH_POWEROFF "/sbin/poweroff"
65
66 #define ACPI_THERMAL_MAX_ACTIVE 10
67 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
68
69 #define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
70 #define CELSIUS_TO_KELVIN(t) ((t+273)*10)
71
72 #define _COMPONENT ACPI_THERMAL_COMPONENT
73 ACPI_MODULE_NAME("acpi_thermal")
74
75 MODULE_AUTHOR("Paul Diefenbaugh");
76 MODULE_DESCRIPTION(ACPI_THERMAL_DRIVER_NAME);
77 MODULE_LICENSE("GPL");
78
79 static int tzp;
80 module_param(tzp, int, 0);
81 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
82
83 static int acpi_thermal_add(struct acpi_device *device);
84 static int acpi_thermal_remove(struct acpi_device *device, int type);
85 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
86 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
87 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
88 static ssize_t acpi_thermal_write_trip_points(struct file *,
89 const char __user *, size_t,
90 loff_t *);
91 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
92 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
93 const char __user *, size_t,
94 loff_t *);
95 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
96 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
97 size_t, loff_t *);
98
99 static struct acpi_driver acpi_thermal_driver = {
100 .name = ACPI_THERMAL_DRIVER_NAME,
101 .class = ACPI_THERMAL_CLASS,
102 .ids = ACPI_THERMAL_HID,
103 .ops = {
104 .add = acpi_thermal_add,
105 .remove = acpi_thermal_remove,
106 },
107 };
108
109 struct acpi_thermal_state {
110 u8 critical:1;
111 u8 hot:1;
112 u8 passive:1;
113 u8 active:1;
114 u8 reserved:4;
115 int active_index;
116 };
117
118 struct acpi_thermal_state_flags {
119 u8 valid:1;
120 u8 enabled:1;
121 u8 reserved:6;
122 };
123
124 struct acpi_thermal_critical {
125 struct acpi_thermal_state_flags flags;
126 unsigned long temperature;
127 };
128
129 struct acpi_thermal_hot {
130 struct acpi_thermal_state_flags flags;
131 unsigned long temperature;
132 };
133
134 struct acpi_thermal_passive {
135 struct acpi_thermal_state_flags flags;
136 unsigned long temperature;
137 unsigned long tc1;
138 unsigned long tc2;
139 unsigned long tsp;
140 struct acpi_handle_list devices;
141 };
142
143 struct acpi_thermal_active {
144 struct acpi_thermal_state_flags flags;
145 unsigned long temperature;
146 struct acpi_handle_list devices;
147 };
148
149 struct acpi_thermal_trips {
150 struct acpi_thermal_critical critical;
151 struct acpi_thermal_hot hot;
152 struct acpi_thermal_passive passive;
153 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
154 };
155
156 struct acpi_thermal_flags {
157 u8 cooling_mode:1; /* _SCP */
158 u8 devices:1; /* _TZD */
159 u8 reserved:6;
160 };
161
162 struct acpi_thermal {
163 acpi_handle handle;
164 acpi_bus_id name;
165 unsigned long temperature;
166 unsigned long last_temperature;
167 unsigned long polling_frequency;
168 u8 cooling_mode;
169 volatile u8 zombie;
170 struct acpi_thermal_flags flags;
171 struct acpi_thermal_state state;
172 struct acpi_thermal_trips trips;
173 struct acpi_handle_list devices;
174 struct timer_list timer;
175 };
176
177 static struct file_operations acpi_thermal_state_fops = {
178 .open = acpi_thermal_state_open_fs,
179 .read = seq_read,
180 .llseek = seq_lseek,
181 .release = single_release,
182 };
183
184 static struct file_operations acpi_thermal_temp_fops = {
185 .open = acpi_thermal_temp_open_fs,
186 .read = seq_read,
187 .llseek = seq_lseek,
188 .release = single_release,
189 };
190
191 static struct file_operations acpi_thermal_trip_fops = {
192 .open = acpi_thermal_trip_open_fs,
193 .read = seq_read,
194 .write = acpi_thermal_write_trip_points,
195 .llseek = seq_lseek,
196 .release = single_release,
197 };
198
199 static struct file_operations acpi_thermal_cooling_fops = {
200 .open = acpi_thermal_cooling_open_fs,
201 .read = seq_read,
202 .write = acpi_thermal_write_cooling_mode,
203 .llseek = seq_lseek,
204 .release = single_release,
205 };
206
207 static struct file_operations acpi_thermal_polling_fops = {
208 .open = acpi_thermal_polling_open_fs,
209 .read = seq_read,
210 .write = acpi_thermal_write_polling,
211 .llseek = seq_lseek,
212 .release = single_release,
213 };
214
215 /* --------------------------------------------------------------------------
216 Thermal Zone Management
217 -------------------------------------------------------------------------- */
218
219 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
220 {
221 acpi_status status = AE_OK;
222
223 ACPI_FUNCTION_TRACE("acpi_thermal_get_temperature");
224
225 if (!tz)
226 return_VALUE(-EINVAL);
227
228 tz->last_temperature = tz->temperature;
229
230 status =
231 acpi_evaluate_integer(tz->handle, "_TMP", NULL, &tz->temperature);
232 if (ACPI_FAILURE(status))
233 return_VALUE(-ENODEV);
234
235 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
236 tz->temperature));
237
238 return_VALUE(0);
239 }
240
241 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
242 {
243 acpi_status status = AE_OK;
244
245 ACPI_FUNCTION_TRACE("acpi_thermal_get_polling_frequency");
246
247 if (!tz)
248 return_VALUE(-EINVAL);
249
250 status =
251 acpi_evaluate_integer(tz->handle, "_TZP", NULL,
252 &tz->polling_frequency);
253 if (ACPI_FAILURE(status))
254 return_VALUE(-ENODEV);
255
256 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
257 tz->polling_frequency));
258
259 return_VALUE(0);
260 }
261
262 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
263 {
264 ACPI_FUNCTION_TRACE("acpi_thermal_set_polling");
265
266 if (!tz)
267 return_VALUE(-EINVAL);
268
269 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */
270
271 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
272 "Polling frequency set to %lu seconds\n",
273 tz->polling_frequency));
274
275 return_VALUE(0);
276 }
277
278 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
279 {
280 acpi_status status = AE_OK;
281 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
282 struct acpi_object_list arg_list = { 1, &arg0 };
283 acpi_handle handle = NULL;
284
285 ACPI_FUNCTION_TRACE("acpi_thermal_set_cooling_mode");
286
287 if (!tz)
288 return_VALUE(-EINVAL);
289
290 status = acpi_get_handle(tz->handle, "_SCP", &handle);
291 if (ACPI_FAILURE(status)) {
292 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
293 return_VALUE(-ENODEV);
294 }
295
296 arg0.integer.value = mode;
297
298 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
299 if (ACPI_FAILURE(status))
300 return_VALUE(-ENODEV);
301
302 tz->cooling_mode = mode;
303
304 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
305 mode ? "passive" : "active"));
306
307 return_VALUE(0);
308 }
309
310 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
311 {
312 acpi_status status = AE_OK;
313 int i = 0;
314
315 ACPI_FUNCTION_TRACE("acpi_thermal_get_trip_points");
316
317 if (!tz)
318 return_VALUE(-EINVAL);
319
320 /* Critical Shutdown (required) */
321
322 status = acpi_evaluate_integer(tz->handle, "_CRT", NULL,
323 &tz->trips.critical.temperature);
324 if (ACPI_FAILURE(status)) {
325 tz->trips.critical.flags.valid = 0;
326 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "No critical threshold\n"));
327 return_VALUE(-ENODEV);
328 } else {
329 tz->trips.critical.flags.valid = 1;
330 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
331 "Found critical threshold [%lu]\n",
332 tz->trips.critical.temperature));
333 }
334
335 /* Critical Sleep (optional) */
336
337 status =
338 acpi_evaluate_integer(tz->handle, "_HOT", NULL,
339 &tz->trips.hot.temperature);
340 if (ACPI_FAILURE(status)) {
341 tz->trips.hot.flags.valid = 0;
342 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
343 } else {
344 tz->trips.hot.flags.valid = 1;
345 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
346 tz->trips.hot.temperature));
347 }
348
349 /* Passive: Processors (optional) */
350
351 status =
352 acpi_evaluate_integer(tz->handle, "_PSV", NULL,
353 &tz->trips.passive.temperature);
354 if (ACPI_FAILURE(status)) {
355 tz->trips.passive.flags.valid = 0;
356 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
357 } else {
358 tz->trips.passive.flags.valid = 1;
359
360 status =
361 acpi_evaluate_integer(tz->handle, "_TC1", NULL,
362 &tz->trips.passive.tc1);
363 if (ACPI_FAILURE(status))
364 tz->trips.passive.flags.valid = 0;
365
366 status =
367 acpi_evaluate_integer(tz->handle, "_TC2", NULL,
368 &tz->trips.passive.tc2);
369 if (ACPI_FAILURE(status))
370 tz->trips.passive.flags.valid = 0;
371
372 status =
373 acpi_evaluate_integer(tz->handle, "_TSP", NULL,
374 &tz->trips.passive.tsp);
375 if (ACPI_FAILURE(status))
376 tz->trips.passive.flags.valid = 0;
377
378 status =
379 acpi_evaluate_reference(tz->handle, "_PSL", NULL,
380 &tz->trips.passive.devices);
381 if (ACPI_FAILURE(status))
382 tz->trips.passive.flags.valid = 0;
383
384 if (!tz->trips.passive.flags.valid)
385 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
386 "Invalid passive threshold\n"));
387 else
388 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
389 "Found passive threshold [%lu]\n",
390 tz->trips.passive.temperature));
391 }
392
393 /* Active: Fans, etc. (optional) */
394
395 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
396
397 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
398
399 status =
400 acpi_evaluate_integer(tz->handle, name, NULL,
401 &tz->trips.active[i].temperature);
402 if (ACPI_FAILURE(status))
403 break;
404
405 name[2] = 'L';
406 status =
407 acpi_evaluate_reference(tz->handle, name, NULL,
408 &tz->trips.active[i].devices);
409 if (ACPI_SUCCESS(status)) {
410 tz->trips.active[i].flags.valid = 1;
411 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
412 "Found active threshold [%d]:[%lu]\n",
413 i, tz->trips.active[i].temperature));
414 } else
415 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
416 "Invalid active threshold [%d]\n",
417 i));
418 }
419
420 return_VALUE(0);
421 }
422
423 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
424 {
425 acpi_status status = AE_OK;
426
427 ACPI_FUNCTION_TRACE("acpi_thermal_get_devices");
428
429 if (!tz)
430 return_VALUE(-EINVAL);
431
432 status =
433 acpi_evaluate_reference(tz->handle, "_TZD", NULL, &tz->devices);
434 if (ACPI_FAILURE(status))
435 return_VALUE(-ENODEV);
436
437 return_VALUE(0);
438 }
439
440 static int acpi_thermal_call_usermode(char *path)
441 {
442 char *argv[2] = { NULL, NULL };
443 char *envp[3] = { NULL, NULL, NULL };
444
445 ACPI_FUNCTION_TRACE("acpi_thermal_call_usermode");
446
447 if (!path)
448 return_VALUE(-EINVAL);
449
450 argv[0] = path;
451
452 /* minimal command environment */
453 envp[0] = "HOME=/";
454 envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
455
456 call_usermodehelper(argv[0], argv, envp, 0);
457
458 return_VALUE(0);
459 }
460
461 static int acpi_thermal_critical(struct acpi_thermal *tz)
462 {
463 int result = 0;
464 struct acpi_device *device = NULL;
465
466 ACPI_FUNCTION_TRACE("acpi_thermal_critical");
467
468 if (!tz || !tz->trips.critical.flags.valid)
469 return_VALUE(-EINVAL);
470
471 if (tz->temperature >= tz->trips.critical.temperature) {
472 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Critical trip point\n"));
473 tz->trips.critical.flags.enabled = 1;
474 } else if (tz->trips.critical.flags.enabled)
475 tz->trips.critical.flags.enabled = 0;
476
477 result = acpi_bus_get_device(tz->handle, &device);
478 if (result)
479 return_VALUE(result);
480
481 printk(KERN_EMERG
482 "Critical temperature reached (%ld C), shutting down.\n",
483 KELVIN_TO_CELSIUS(tz->temperature));
484 acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL,
485 tz->trips.critical.flags.enabled);
486
487 acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
488
489 return_VALUE(0);
490 }
491
492 static int acpi_thermal_hot(struct acpi_thermal *tz)
493 {
494 int result = 0;
495 struct acpi_device *device = NULL;
496
497 ACPI_FUNCTION_TRACE("acpi_thermal_hot");
498
499 if (!tz || !tz->trips.hot.flags.valid)
500 return_VALUE(-EINVAL);
501
502 if (tz->temperature >= tz->trips.hot.temperature) {
503 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Hot trip point\n"));
504 tz->trips.hot.flags.enabled = 1;
505 } else if (tz->trips.hot.flags.enabled)
506 tz->trips.hot.flags.enabled = 0;
507
508 result = acpi_bus_get_device(tz->handle, &device);
509 if (result)
510 return_VALUE(result);
511
512 acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT,
513 tz->trips.hot.flags.enabled);
514
515 /* TBD: Call user-mode "sleep(S4)" function */
516
517 return_VALUE(0);
518 }
519
520 static void acpi_thermal_passive(struct acpi_thermal *tz)
521 {
522 int result = 1;
523 struct acpi_thermal_passive *passive = NULL;
524 int trend = 0;
525 int i = 0;
526
527 ACPI_FUNCTION_TRACE("acpi_thermal_passive");
528
529 if (!tz || !tz->trips.passive.flags.valid)
530 return;
531
532 passive = &(tz->trips.passive);
533
534 /*
535 * Above Trip?
536 * -----------
537 * Calculate the thermal trend (using the passive cooling equation)
538 * and modify the performance limit for all passive cooling devices
539 * accordingly. Note that we assume symmetry.
540 */
541 if (tz->temperature >= passive->temperature) {
542 trend =
543 (passive->tc1 * (tz->temperature - tz->last_temperature)) +
544 (passive->tc2 * (tz->temperature - passive->temperature));
545 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
546 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
547 trend, passive->tc1, tz->temperature,
548 tz->last_temperature, passive->tc2,
549 tz->temperature, passive->temperature));
550 passive->flags.enabled = 1;
551 /* Heating up? */
552 if (trend > 0)
553 for (i = 0; i < passive->devices.count; i++)
554 acpi_processor_set_thermal_limit(passive->
555 devices.
556 handles[i],
557 ACPI_PROCESSOR_LIMIT_INCREMENT);
558 /* Cooling off? */
559 else if (trend < 0) {
560 for (i = 0; i < passive->devices.count; i++)
561 /*
562 * assume that we are on highest
563 * freq/lowest thrott and can leave
564 * passive mode, even in error case
565 */
566 if (!acpi_processor_set_thermal_limit
567 (passive->devices.handles[i],
568 ACPI_PROCESSOR_LIMIT_DECREMENT))
569 result = 0;
570 /*
571 * Leave cooling mode, even if the temp might
572 * higher than trip point This is because some
573 * machines might have long thermal polling
574 * frequencies (tsp) defined. We will fall back
575 * into passive mode in next cycle (probably quicker)
576 */
577 if (result) {
578 passive->flags.enabled = 0;
579 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
580 "Disabling passive cooling, still above threshold,"
581 " but we are cooling down\n"));
582 }
583 }
584 return;
585 }
586
587 /*
588 * Below Trip?
589 * -----------
590 * Implement passive cooling hysteresis to slowly increase performance
591 * and avoid thrashing around the passive trip point. Note that we
592 * assume symmetry.
593 */
594 if (!passive->flags.enabled)
595 return;
596 for (i = 0; i < passive->devices.count; i++)
597 if (!acpi_processor_set_thermal_limit
598 (passive->devices.handles[i],
599 ACPI_PROCESSOR_LIMIT_DECREMENT))
600 result = 0;
601 if (result) {
602 passive->flags.enabled = 0;
603 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
604 "Disabling passive cooling (zone is cool)\n"));
605 }
606 }
607
608 static void acpi_thermal_active(struct acpi_thermal *tz)
609 {
610 int result = 0;
611 struct acpi_thermal_active *active = NULL;
612 int i = 0;
613 int j = 0;
614 unsigned long maxtemp = 0;
615
616 ACPI_FUNCTION_TRACE("acpi_thermal_active");
617
618 if (!tz)
619 return;
620
621 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
622 active = &(tz->trips.active[i]);
623 if (!active || !active->flags.valid)
624 break;
625 if (tz->temperature >= active->temperature) {
626 /*
627 * Above Threshold?
628 * ----------------
629 * If not already enabled, turn ON all cooling devices
630 * associated with this active threshold.
631 */
632 if (active->temperature > maxtemp)
633 tz->state.active_index = i;
634 maxtemp = active->temperature;
635 if (active->flags.enabled)
636 continue;
637 for (j = 0; j < active->devices.count; j++) {
638 result =
639 acpi_bus_set_power(active->devices.
640 handles[j],
641 ACPI_STATE_D0);
642 if (result) {
643 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
644 "Unable to turn cooling device [%p] 'on'\n",
645 active->devices.
646 handles[j]));
647 continue;
648 }
649 active->flags.enabled = 1;
650 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
651 "Cooling device [%p] now 'on'\n",
652 active->devices.handles[j]));
653 }
654 continue;
655 }
656 if (!active->flags.enabled)
657 continue;
658 /*
659 * Below Threshold?
660 * ----------------
661 * Turn OFF all cooling devices associated with this
662 * threshold.
663 */
664 for (j = 0; j < active->devices.count; j++) {
665 result = acpi_bus_set_power(active->devices.handles[j],
666 ACPI_STATE_D3);
667 if (result) {
668 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
669 "Unable to turn cooling device [%p] 'off'\n",
670 active->devices.handles[j]));
671 continue;
672 }
673 active->flags.enabled = 0;
674 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
675 "Cooling device [%p] now 'off'\n",
676 active->devices.handles[j]));
677 }
678 }
679 }
680
681 static void acpi_thermal_check(void *context);
682
683 static void acpi_thermal_run(unsigned long data)
684 {
685 struct acpi_thermal *tz = (struct acpi_thermal *)data;
686 if (!tz->zombie)
687 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
688 }
689
690 static void acpi_thermal_check(void *data)
691 {
692 int result = 0;
693 struct acpi_thermal *tz = (struct acpi_thermal *)data;
694 unsigned long sleep_time = 0;
695 int i = 0;
696 struct acpi_thermal_state state;
697
698 ACPI_FUNCTION_TRACE("acpi_thermal_check");
699
700 if (!tz) {
701 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
702 return_VOID;
703 }
704
705 state = tz->state;
706
707 result = acpi_thermal_get_temperature(tz);
708 if (result)
709 return_VOID;
710
711 memset(&tz->state, 0, sizeof(tz->state));
712
713 /*
714 * Check Trip Points
715 * -----------------
716 * Compare the current temperature to the trip point values to see
717 * if we've entered one of the thermal policy states. Note that
718 * this function determines when a state is entered, but the
719 * individual policy decides when it is exited (e.g. hysteresis).
720 */
721 if (tz->trips.critical.flags.valid)
722 state.critical |=
723 (tz->temperature >= tz->trips.critical.temperature);
724 if (tz->trips.hot.flags.valid)
725 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
726 if (tz->trips.passive.flags.valid)
727 state.passive |=
728 (tz->temperature >= tz->trips.passive.temperature);
729 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
730 if (tz->trips.active[i].flags.valid)
731 state.active |=
732 (tz->temperature >=
733 tz->trips.active[i].temperature);
734
735 /*
736 * Invoke Policy
737 * -------------
738 * Separated from the above check to allow individual policy to
739 * determine when to exit a given state.
740 */
741 if (state.critical)
742 acpi_thermal_critical(tz);
743 if (state.hot)
744 acpi_thermal_hot(tz);
745 if (state.passive)
746 acpi_thermal_passive(tz);
747 if (state.active)
748 acpi_thermal_active(tz);
749
750 /*
751 * Calculate State
752 * ---------------
753 * Again, separated from the above two to allow independent policy
754 * decisions.
755 */
756 tz->state.critical = tz->trips.critical.flags.enabled;
757 tz->state.hot = tz->trips.hot.flags.enabled;
758 tz->state.passive = tz->trips.passive.flags.enabled;
759 tz->state.active = 0;
760 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
761 tz->state.active |= tz->trips.active[i].flags.enabled;
762
763 /*
764 * Calculate Sleep Time
765 * --------------------
766 * If we're in the passive state, use _TSP's value. Otherwise
767 * use the default polling frequency (e.g. _TZP). If no polling
768 * frequency is specified then we'll wait forever (at least until
769 * a thermal event occurs). Note that _TSP and _TZD values are
770 * given in 1/10th seconds (we must covert to milliseconds).
771 */
772 if (tz->state.passive)
773 sleep_time = tz->trips.passive.tsp * 100;
774 else if (tz->polling_frequency > 0)
775 sleep_time = tz->polling_frequency * 100;
776
777 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
778 tz->name, tz->temperature, sleep_time));
779
780 /*
781 * Schedule Next Poll
782 * ------------------
783 */
784 if (!sleep_time) {
785 if (timer_pending(&(tz->timer)))
786 del_timer(&(tz->timer));
787 } else {
788 if (timer_pending(&(tz->timer)))
789 mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
790 else {
791 tz->timer.data = (unsigned long)tz;
792 tz->timer.function = acpi_thermal_run;
793 tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
794 add_timer(&(tz->timer));
795 }
796 }
797
798 return_VOID;
799 }
800
801 /* --------------------------------------------------------------------------
802 FS Interface (/proc)
803 -------------------------------------------------------------------------- */
804
805 static struct proc_dir_entry *acpi_thermal_dir;
806
807 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
808 {
809 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
810
811 ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show");
812
813 if (!tz)
814 goto end;
815
816 seq_puts(seq, "state: ");
817
818 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
819 && !tz->state.active)
820 seq_puts(seq, "ok\n");
821 else {
822 if (tz->state.critical)
823 seq_puts(seq, "critical ");
824 if (tz->state.hot)
825 seq_puts(seq, "hot ");
826 if (tz->state.passive)
827 seq_puts(seq, "passive ");
828 if (tz->state.active)
829 seq_printf(seq, "active[%d]", tz->state.active_index);
830 seq_puts(seq, "\n");
831 }
832
833 end:
834 return_VALUE(0);
835 }
836
837 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
838 {
839 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
840 }
841
842 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
843 {
844 int result = 0;
845 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
846
847 ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show");
848
849 if (!tz)
850 goto end;
851
852 result = acpi_thermal_get_temperature(tz);
853 if (result)
854 goto end;
855
856 seq_printf(seq, "temperature: %ld C\n",
857 KELVIN_TO_CELSIUS(tz->temperature));
858
859 end:
860 return_VALUE(0);
861 }
862
863 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
864 {
865 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
866 }
867
868 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
869 {
870 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
871 int i = 0;
872 int j = 0;
873
874 ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show");
875
876 if (!tz)
877 goto end;
878
879 if (tz->trips.critical.flags.valid)
880 seq_printf(seq, "critical (S5): %ld C\n",
881 KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
882
883 if (tz->trips.hot.flags.valid)
884 seq_printf(seq, "hot (S4): %ld C\n",
885 KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
886
887 if (tz->trips.passive.flags.valid) {
888 seq_printf(seq,
889 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
890 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
891 tz->trips.passive.tc1, tz->trips.passive.tc2,
892 tz->trips.passive.tsp);
893 for (j = 0; j < tz->trips.passive.devices.count; j++) {
894
895 seq_printf(seq, "0x%p ",
896 tz->trips.passive.devices.handles[j]);
897 }
898 seq_puts(seq, "\n");
899 }
900
901 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
902 if (!(tz->trips.active[i].flags.valid))
903 break;
904 seq_printf(seq, "active[%d]: %ld C: devices=",
905 i,
906 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
907 for (j = 0; j < tz->trips.active[i].devices.count; j++)
908 seq_printf(seq, "0x%p ",
909 tz->trips.active[i].devices.handles[j]);
910 seq_puts(seq, "\n");
911 }
912
913 end:
914 return_VALUE(0);
915 }
916
917 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
918 {
919 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
920 }
921
922 static ssize_t
923 acpi_thermal_write_trip_points(struct file *file,
924 const char __user * buffer,
925 size_t count, loff_t * ppos)
926 {
927 struct seq_file *m = (struct seq_file *)file->private_data;
928 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
929
930 char *limit_string;
931 int num, critical, hot, passive;
932 int *active;
933 int i = 0;
934
935 ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points");
936
937 limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
938 if (!limit_string)
939 return_VALUE(-ENOMEM);
940
941 memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN);
942
943 active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
944 if (!active)
945 return_VALUE(-ENOMEM);
946
947 if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
948 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
949 count = -EINVAL;
950 goto end;
951 }
952
953 if (copy_from_user(limit_string, buffer, count)) {
954 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
955 count = -EFAULT;
956 goto end;
957 }
958
959 limit_string[count] = '\0';
960
961 num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
962 &critical, &hot, &passive,
963 &active[0], &active[1], &active[2], &active[3], &active[4],
964 &active[5], &active[6], &active[7], &active[8],
965 &active[9]);
966 if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
967 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
968 count = -EINVAL;
969 goto end;
970 }
971
972 tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
973 tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
974 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
975 for (i = 0; i < num - 3; i++) {
976 if (!(tz->trips.active[i].flags.valid))
977 break;
978 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
979 }
980
981 end:
982 kfree(active);
983 kfree(limit_string);
984 return_VALUE(count);
985 }
986
987 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
988 {
989 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
990
991 ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show");
992
993 if (!tz)
994 goto end;
995
996 if (!tz->flags.cooling_mode) {
997 seq_puts(seq, "<setting not supported>\n");
998 }
999
1000 if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
1001 seq_printf(seq, "cooling mode: critical\n");
1002 else
1003 seq_printf(seq, "cooling mode: %s\n",
1004 tz->cooling_mode ? "passive" : "active");
1005
1006 end:
1007 return_VALUE(0);
1008 }
1009
1010 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1011 {
1012 return single_open(file, acpi_thermal_cooling_seq_show,
1013 PDE(inode)->data);
1014 }
1015
1016 static ssize_t
1017 acpi_thermal_write_cooling_mode(struct file *file,
1018 const char __user * buffer,
1019 size_t count, loff_t * ppos)
1020 {
1021 struct seq_file *m = (struct seq_file *)file->private_data;
1022 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1023 int result = 0;
1024 char mode_string[12] = { '\0' };
1025
1026 ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode");
1027
1028 if (!tz || (count > sizeof(mode_string) - 1))
1029 return_VALUE(-EINVAL);
1030
1031 if (!tz->flags.cooling_mode)
1032 return_VALUE(-ENODEV);
1033
1034 if (copy_from_user(mode_string, buffer, count))
1035 return_VALUE(-EFAULT);
1036
1037 mode_string[count] = '\0';
1038
1039 result = acpi_thermal_set_cooling_mode(tz,
1040 simple_strtoul(mode_string, NULL,
1041 0));
1042 if (result)
1043 return_VALUE(result);
1044
1045 acpi_thermal_check(tz);
1046
1047 return_VALUE(count);
1048 }
1049
1050 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1051 {
1052 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
1053
1054 ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show");
1055
1056 if (!tz)
1057 goto end;
1058
1059 if (!tz->polling_frequency) {
1060 seq_puts(seq, "<polling disabled>\n");
1061 goto end;
1062 }
1063
1064 seq_printf(seq, "polling frequency: %lu seconds\n",
1065 (tz->polling_frequency / 10));
1066
1067 end:
1068 return_VALUE(0);
1069 }
1070
1071 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1072 {
1073 return single_open(file, acpi_thermal_polling_seq_show,
1074 PDE(inode)->data);
1075 }
1076
1077 static ssize_t
1078 acpi_thermal_write_polling(struct file *file,
1079 const char __user * buffer,
1080 size_t count, loff_t * ppos)
1081 {
1082 struct seq_file *m = (struct seq_file *)file->private_data;
1083 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1084 int result = 0;
1085 char polling_string[12] = { '\0' };
1086 int seconds = 0;
1087
1088 ACPI_FUNCTION_TRACE("acpi_thermal_write_polling");
1089
1090 if (!tz || (count > sizeof(polling_string) - 1))
1091 return_VALUE(-EINVAL);
1092
1093 if (copy_from_user(polling_string, buffer, count))
1094 return_VALUE(-EFAULT);
1095
1096 polling_string[count] = '\0';
1097
1098 seconds = simple_strtoul(polling_string, NULL, 0);
1099
1100 result = acpi_thermal_set_polling(tz, seconds);
1101 if (result)
1102 return_VALUE(result);
1103
1104 acpi_thermal_check(tz);
1105
1106 return_VALUE(count);
1107 }
1108
1109 static int acpi_thermal_add_fs(struct acpi_device *device)
1110 {
1111 struct proc_dir_entry *entry = NULL;
1112
1113 ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
1114
1115 if (!acpi_device_dir(device)) {
1116 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1117 acpi_thermal_dir);
1118 if (!acpi_device_dir(device))
1119 return_VALUE(-ENODEV);
1120 acpi_device_dir(device)->owner = THIS_MODULE;
1121 }
1122
1123 /* 'state' [R] */
1124 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1125 S_IRUGO, acpi_device_dir(device));
1126 if (!entry)
1127 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1128 "Unable to create '%s' fs entry\n",
1129 ACPI_THERMAL_FILE_STATE));
1130 else {
1131 entry->proc_fops = &acpi_thermal_state_fops;
1132 entry->data = acpi_driver_data(device);
1133 entry->owner = THIS_MODULE;
1134 }
1135
1136 /* 'temperature' [R] */
1137 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1138 S_IRUGO, acpi_device_dir(device));
1139 if (!entry)
1140 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1141 "Unable to create '%s' fs entry\n",
1142 ACPI_THERMAL_FILE_TEMPERATURE));
1143 else {
1144 entry->proc_fops = &acpi_thermal_temp_fops;
1145 entry->data = acpi_driver_data(device);
1146 entry->owner = THIS_MODULE;
1147 }
1148
1149 /* 'trip_points' [R/W] */
1150 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1151 S_IFREG | S_IRUGO | S_IWUSR,
1152 acpi_device_dir(device));
1153 if (!entry)
1154 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1155 "Unable to create '%s' fs entry\n",
1156 ACPI_THERMAL_FILE_TRIP_POINTS));
1157 else {
1158 entry->proc_fops = &acpi_thermal_trip_fops;
1159 entry->data = acpi_driver_data(device);
1160 entry->owner = THIS_MODULE;
1161 }
1162
1163 /* 'cooling_mode' [R/W] */
1164 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1165 S_IFREG | S_IRUGO | S_IWUSR,
1166 acpi_device_dir(device));
1167 if (!entry)
1168 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1169 "Unable to create '%s' fs entry\n",
1170 ACPI_THERMAL_FILE_COOLING_MODE));
1171 else {
1172 entry->proc_fops = &acpi_thermal_cooling_fops;
1173 entry->data = acpi_driver_data(device);
1174 entry->owner = THIS_MODULE;
1175 }
1176
1177 /* 'polling_frequency' [R/W] */
1178 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1179 S_IFREG | S_IRUGO | S_IWUSR,
1180 acpi_device_dir(device));
1181 if (!entry)
1182 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1183 "Unable to create '%s' fs entry\n",
1184 ACPI_THERMAL_FILE_POLLING_FREQ));
1185 else {
1186 entry->proc_fops = &acpi_thermal_polling_fops;
1187 entry->data = acpi_driver_data(device);
1188 entry->owner = THIS_MODULE;
1189 }
1190
1191 return_VALUE(0);
1192 }
1193
1194 static int acpi_thermal_remove_fs(struct acpi_device *device)
1195 {
1196 ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
1197
1198 if (acpi_device_dir(device)) {
1199 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1200 acpi_device_dir(device));
1201 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1202 acpi_device_dir(device));
1203 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1204 acpi_device_dir(device));
1205 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1206 acpi_device_dir(device));
1207 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1208 acpi_device_dir(device));
1209 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1210 acpi_device_dir(device) = NULL;
1211 }
1212
1213 return_VALUE(0);
1214 }
1215
1216 /* --------------------------------------------------------------------------
1217 Driver Interface
1218 -------------------------------------------------------------------------- */
1219
1220 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1221 {
1222 struct acpi_thermal *tz = (struct acpi_thermal *)data;
1223 struct acpi_device *device = NULL;
1224
1225 ACPI_FUNCTION_TRACE("acpi_thermal_notify");
1226
1227 if (!tz)
1228 return_VOID;
1229
1230 if (acpi_bus_get_device(tz->handle, &device))
1231 return_VOID;
1232
1233 switch (event) {
1234 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1235 acpi_thermal_check(tz);
1236 break;
1237 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1238 acpi_thermal_get_trip_points(tz);
1239 acpi_thermal_check(tz);
1240 acpi_bus_generate_event(device, event, 0);
1241 break;
1242 case ACPI_THERMAL_NOTIFY_DEVICES:
1243 if (tz->flags.devices)
1244 acpi_thermal_get_devices(tz);
1245 acpi_bus_generate_event(device, event, 0);
1246 break;
1247 default:
1248 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1249 "Unsupported event [0x%x]\n", event));
1250 break;
1251 }
1252
1253 return_VOID;
1254 }
1255
1256 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1257 {
1258 int result = 0;
1259
1260 ACPI_FUNCTION_TRACE("acpi_thermal_get_info");
1261
1262 if (!tz)
1263 return_VALUE(-EINVAL);
1264
1265 /* Get temperature [_TMP] (required) */
1266 result = acpi_thermal_get_temperature(tz);
1267 if (result)
1268 return_VALUE(result);
1269
1270 /* Get trip points [_CRT, _PSV, etc.] (required) */
1271 result = acpi_thermal_get_trip_points(tz);
1272 if (result)
1273 return_VALUE(result);
1274
1275 /* Set the cooling mode [_SCP] to active cooling (default) */
1276 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1277 if (!result)
1278 tz->flags.cooling_mode = 1;
1279 else {
1280 /* Oh,we have not _SCP method.
1281 Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1282 tz->flags.cooling_mode = 0;
1283 if (tz->trips.active[0].flags.valid
1284 && tz->trips.passive.flags.valid) {
1285 if (tz->trips.passive.temperature >
1286 tz->trips.active[0].temperature)
1287 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1288 else
1289 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1290 } else if (!tz->trips.active[0].flags.valid
1291 && tz->trips.passive.flags.valid) {
1292 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1293 } else if (tz->trips.active[0].flags.valid
1294 && !tz->trips.passive.flags.valid) {
1295 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1296 } else {
1297 /* _ACx and _PSV are optional, but _CRT is required */
1298 tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1299 }
1300 }
1301
1302 /* Get default polling frequency [_TZP] (optional) */
1303 if (tzp)
1304 tz->polling_frequency = tzp;
1305 else
1306 acpi_thermal_get_polling_frequency(tz);
1307
1308 /* Get devices in this thermal zone [_TZD] (optional) */
1309 result = acpi_thermal_get_devices(tz);
1310 if (!result)
1311 tz->flags.devices = 1;
1312
1313 return_VALUE(0);
1314 }
1315
1316 static int acpi_thermal_add(struct acpi_device *device)
1317 {
1318 int result = 0;
1319 acpi_status status = AE_OK;
1320 struct acpi_thermal *tz = NULL;
1321
1322 ACPI_FUNCTION_TRACE("acpi_thermal_add");
1323
1324 if (!device)
1325 return_VALUE(-EINVAL);
1326
1327 tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1328 if (!tz)
1329 return_VALUE(-ENOMEM);
1330 memset(tz, 0, sizeof(struct acpi_thermal));
1331
1332 tz->handle = device->handle;
1333 strcpy(tz->name, device->pnp.bus_id);
1334 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1335 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1336 acpi_driver_data(device) = tz;
1337
1338 result = acpi_thermal_get_info(tz);
1339 if (result)
1340 goto end;
1341
1342 result = acpi_thermal_add_fs(device);
1343 if (result)
1344 return_VALUE(result);
1345
1346 init_timer(&tz->timer);
1347
1348 acpi_thermal_check(tz);
1349
1350 status = acpi_install_notify_handler(tz->handle,
1351 ACPI_DEVICE_NOTIFY,
1352 acpi_thermal_notify, tz);
1353 if (ACPI_FAILURE(status)) {
1354 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1355 "Error installing notify handler\n"));
1356 result = -ENODEV;
1357 goto end;
1358 }
1359
1360 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1361 acpi_device_name(device), acpi_device_bid(device),
1362 KELVIN_TO_CELSIUS(tz->temperature));
1363
1364 end:
1365 if (result) {
1366 acpi_thermal_remove_fs(device);
1367 kfree(tz);
1368 }
1369
1370 return_VALUE(result);
1371 }
1372
1373 static int acpi_thermal_remove(struct acpi_device *device, int type)
1374 {
1375 acpi_status status = AE_OK;
1376 struct acpi_thermal *tz = NULL;
1377
1378 ACPI_FUNCTION_TRACE("acpi_thermal_remove");
1379
1380 if (!device || !acpi_driver_data(device))
1381 return_VALUE(-EINVAL);
1382
1383 tz = (struct acpi_thermal *)acpi_driver_data(device);
1384
1385 /* avoid timer adding new defer task */
1386 tz->zombie = 1;
1387 /* wait for running timer (on other CPUs) finish */
1388 del_timer_sync(&(tz->timer));
1389 /* synchronize deferred task */
1390 acpi_os_wait_events_complete(NULL);
1391 /* deferred task may reinsert timer */
1392 del_timer_sync(&(tz->timer));
1393
1394 status = acpi_remove_notify_handler(tz->handle,
1395 ACPI_DEVICE_NOTIFY,
1396 acpi_thermal_notify);
1397 if (ACPI_FAILURE(status))
1398 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1399 "Error removing notify handler\n"));
1400
1401 /* Terminate policy */
1402 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1403 tz->trips.passive.flags.enabled = 0;
1404 acpi_thermal_passive(tz);
1405 }
1406 if (tz->trips.active[0].flags.valid
1407 && tz->trips.active[0].flags.enabled) {
1408 tz->trips.active[0].flags.enabled = 0;
1409 acpi_thermal_active(tz);
1410 }
1411
1412 acpi_thermal_remove_fs(device);
1413
1414 kfree(tz);
1415 return_VALUE(0);
1416 }
1417
1418 static int __init acpi_thermal_init(void)
1419 {
1420 int result = 0;
1421
1422 ACPI_FUNCTION_TRACE("acpi_thermal_init");
1423
1424 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1425 if (!acpi_thermal_dir)
1426 return_VALUE(-ENODEV);
1427 acpi_thermal_dir->owner = THIS_MODULE;
1428
1429 result = acpi_bus_register_driver(&acpi_thermal_driver);
1430 if (result < 0) {
1431 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1432 return_VALUE(-ENODEV);
1433 }
1434
1435 return_VALUE(0);
1436 }
1437
1438 static void __exit acpi_thermal_exit(void)
1439 {
1440 ACPI_FUNCTION_TRACE("acpi_thermal_exit");
1441
1442 acpi_bus_unregister_driver(&acpi_thermal_driver);
1443
1444 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1445
1446 return_VOID;
1447 }
1448
1449 module_init(acpi_thermal_init);
1450 module_exit(acpi_thermal_exit);
Linux kernel - Deliverables
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