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[libata] restore sg on DMA mapping failure
[linux-2.6/kvm.git] / drivers / acpi / thermal.c
bloba24847c08f7f43d47cc28b33440e5d8d1bd04268
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 int acpi_thermal_passive(struct acpi_thermal *tz)
521 {
522 int result = 0;
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_VALUE(-EINVAL);
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 tz->trips.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 acpi_processor_set_thermal_limit(passive->
562 devices.
563 handles[i],
564 ACPI_PROCESSOR_LIMIT_DECREMENT);
565 }
566
567 /*
568 * Below Trip?
569 * -----------
570 * Implement passive cooling hysteresis to slowly increase performance
571 * and avoid thrashing around the passive trip point. Note that we
572 * assume symmetry.
573 */
574 else if (tz->trips.passive.flags.enabled) {
575 for (i = 0; i < passive->devices.count; i++)
576 result =
577 acpi_processor_set_thermal_limit(passive->devices.
578 handles[i],
579 ACPI_PROCESSOR_LIMIT_DECREMENT);
580 if (result == 1) {
581 tz->trips.passive.flags.enabled = 0;
582 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
583 "Disabling passive cooling (zone is cool)\n"));
584 }
585 }
586
587 return_VALUE(0);
588 }
589
590 static int acpi_thermal_active(struct acpi_thermal *tz)
591 {
592 int result = 0;
593 struct acpi_thermal_active *active = NULL;
594 int i = 0;
595 int j = 0;
596 unsigned long maxtemp = 0;
597
598 ACPI_FUNCTION_TRACE("acpi_thermal_active");
599
600 if (!tz)
601 return_VALUE(-EINVAL);
602
603 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
604
605 active = &(tz->trips.active[i]);
606 if (!active || !active->flags.valid)
607 break;
608
609 /*
610 * Above Threshold?
611 * ----------------
612 * If not already enabled, turn ON all cooling devices
613 * associated with this active threshold.
614 */
615 if (tz->temperature >= active->temperature) {
616 if (active->temperature > maxtemp)
617 tz->state.active_index = i, maxtemp =
618 active->temperature;
619 if (!active->flags.enabled) {
620 for (j = 0; j < active->devices.count; j++) {
621 result =
622 acpi_bus_set_power(active->devices.
623 handles[j],
624 ACPI_STATE_D0);
625 if (result) {
626 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
627 "Unable to turn cooling device [%p] 'on'\n",
628 active->
629 devices.
630 handles[j]));
631 continue;
632 }
633 active->flags.enabled = 1;
634 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
635 "Cooling device [%p] now 'on'\n",
636 active->devices.
637 handles[j]));
638 }
639 }
640 }
641 /*
642 * Below Threshold?
643 * ----------------
644 * Turn OFF all cooling devices associated with this
645 * threshold.
646 */
647 else if (active->flags.enabled) {
648 for (j = 0; j < active->devices.count; j++) {
649 result =
650 acpi_bus_set_power(active->devices.
651 handles[j],
652 ACPI_STATE_D3);
653 if (result) {
654 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
655 "Unable to turn cooling device [%p] 'off'\n",
656 active->devices.
657 handles[j]));
658 continue;
659 }
660 active->flags.enabled = 0;
661 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
662 "Cooling device [%p] now 'off'\n",
663 active->devices.handles[j]));
664 }
665 }
666 }
667
668 return_VALUE(0);
669 }
670
671 static void acpi_thermal_check(void *context);
672
673 static void acpi_thermal_run(unsigned long data)
674 {
675 struct acpi_thermal *tz = (struct acpi_thermal *)data;
676 if (!tz->zombie)
677 acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
678 acpi_thermal_check, (void *)data);
679 }
680
681 static void acpi_thermal_check(void *data)
682 {
683 int result = 0;
684 struct acpi_thermal *tz = (struct acpi_thermal *)data;
685 unsigned long sleep_time = 0;
686 int i = 0;
687 struct acpi_thermal_state state;
688
689 ACPI_FUNCTION_TRACE("acpi_thermal_check");
690
691 if (!tz) {
692 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
693 return_VOID;
694 }
695
696 state = tz->state;
697
698 result = acpi_thermal_get_temperature(tz);
699 if (result)
700 return_VOID;
701
702 memset(&tz->state, 0, sizeof(tz->state));
703
704 /*
705 * Check Trip Points
706 * -----------------
707 * Compare the current temperature to the trip point values to see
708 * if we've entered one of the thermal policy states. Note that
709 * this function determines when a state is entered, but the
710 * individual policy decides when it is exited (e.g. hysteresis).
711 */
712 if (tz->trips.critical.flags.valid)
713 state.critical |=
714 (tz->temperature >= tz->trips.critical.temperature);
715 if (tz->trips.hot.flags.valid)
716 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
717 if (tz->trips.passive.flags.valid)
718 state.passive |=
719 (tz->temperature >= tz->trips.passive.temperature);
720 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
721 if (tz->trips.active[i].flags.valid)
722 state.active |=
723 (tz->temperature >=
724 tz->trips.active[i].temperature);
725
726 /*
727 * Invoke Policy
728 * -------------
729 * Separated from the above check to allow individual policy to
730 * determine when to exit a given state.
731 */
732 if (state.critical)
733 acpi_thermal_critical(tz);
734 if (state.hot)
735 acpi_thermal_hot(tz);
736 if (state.passive)
737 acpi_thermal_passive(tz);
738 if (state.active)
739 acpi_thermal_active(tz);
740
741 /*
742 * Calculate State
743 * ---------------
744 * Again, separated from the above two to allow independent policy
745 * decisions.
746 */
747 if (tz->trips.critical.flags.enabled)
748 tz->state.critical = 1;
749 if (tz->trips.hot.flags.enabled)
750 tz->state.hot = 1;
751 if (tz->trips.passive.flags.enabled)
752 tz->state.passive = 1;
753 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
754 if (tz->trips.active[i].flags.enabled)
755 tz->state.active = 1;
756
757 /*
758 * Calculate Sleep Time
759 * --------------------
760 * If we're in the passive state, use _TSP's value. Otherwise
761 * use the default polling frequency (e.g. _TZP). If no polling
762 * frequency is specified then we'll wait forever (at least until
763 * a thermal event occurs). Note that _TSP and _TZD values are
764 * given in 1/10th seconds (we must covert to milliseconds).
765 */
766 if (tz->state.passive)
767 sleep_time = tz->trips.passive.tsp * 100;
768 else if (tz->polling_frequency > 0)
769 sleep_time = tz->polling_frequency * 100;
770
771 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
772 tz->name, tz->temperature, sleep_time));
773
774 /*
775 * Schedule Next Poll
776 * ------------------
777 */
778 if (!sleep_time) {
779 if (timer_pending(&(tz->timer)))
780 del_timer(&(tz->timer));
781 } else {
782 if (timer_pending(&(tz->timer)))
783 mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
784 else {
785 tz->timer.data = (unsigned long)tz;
786 tz->timer.function = acpi_thermal_run;
787 tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
788 add_timer(&(tz->timer));
789 }
790 }
791
792 return_VOID;
793 }
794
795 /* --------------------------------------------------------------------------
796 FS Interface (/proc)
797 -------------------------------------------------------------------------- */
798
799 static struct proc_dir_entry *acpi_thermal_dir;
800
801 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
802 {
803 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
804
805 ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show");
806
807 if (!tz)
808 goto end;
809
810 seq_puts(seq, "state: ");
811
812 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
813 && !tz->state.active)
814 seq_puts(seq, "ok\n");
815 else {
816 if (tz->state.critical)
817 seq_puts(seq, "critical ");
818 if (tz->state.hot)
819 seq_puts(seq, "hot ");
820 if (tz->state.passive)
821 seq_puts(seq, "passive ");
822 if (tz->state.active)
823 seq_printf(seq, "active[%d]", tz->state.active_index);
824 seq_puts(seq, "\n");
825 }
826
827 end:
828 return_VALUE(0);
829 }
830
831 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
832 {
833 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
834 }
835
836 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
837 {
838 int result = 0;
839 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
840
841 ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show");
842
843 if (!tz)
844 goto end;
845
846 result = acpi_thermal_get_temperature(tz);
847 if (result)
848 goto end;
849
850 seq_printf(seq, "temperature: %ld C\n",
851 KELVIN_TO_CELSIUS(tz->temperature));
852
853 end:
854 return_VALUE(0);
855 }
856
857 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
858 {
859 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
860 }
861
862 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
863 {
864 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
865 int i = 0;
866 int j = 0;
867
868 ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show");
869
870 if (!tz)
871 goto end;
872
873 if (tz->trips.critical.flags.valid)
874 seq_printf(seq, "critical (S5): %ld C\n",
875 KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
876
877 if (tz->trips.hot.flags.valid)
878 seq_printf(seq, "hot (S4): %ld C\n",
879 KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
880
881 if (tz->trips.passive.flags.valid) {
882 seq_printf(seq,
883 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
884 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
885 tz->trips.passive.tc1, tz->trips.passive.tc2,
886 tz->trips.passive.tsp);
887 for (j = 0; j < tz->trips.passive.devices.count; j++) {
888
889 seq_printf(seq, "0x%p ",
890 tz->trips.passive.devices.handles[j]);
891 }
892 seq_puts(seq, "\n");
893 }
894
895 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
896 if (!(tz->trips.active[i].flags.valid))
897 break;
898 seq_printf(seq, "active[%d]: %ld C: devices=",
899 i,
900 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
901 for (j = 0; j < tz->trips.active[i].devices.count; j++)
902 seq_printf(seq, "0x%p ",
903 tz->trips.active[i].devices.handles[j]);
904 seq_puts(seq, "\n");
905 }
906
907 end:
908 return_VALUE(0);
909 }
910
911 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
912 {
913 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
914 }
915
916 static ssize_t
917 acpi_thermal_write_trip_points(struct file *file,
918 const char __user * buffer,
919 size_t count, loff_t * ppos)
920 {
921 struct seq_file *m = (struct seq_file *)file->private_data;
922 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
923
924 char *limit_string;
925 int num, critical, hot, passive;
926 int *active;
927 int i = 0;
928
929 ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points");
930
931 limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
932 if (!limit_string)
933 return_VALUE(-ENOMEM);
934
935 memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN);
936
937 active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
938 if (!active)
939 return_VALUE(-ENOMEM);
940
941 if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
942 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
943 count = -EINVAL;
944 goto end;
945 }
946
947 if (copy_from_user(limit_string, buffer, count)) {
948 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
949 count = -EFAULT;
950 goto end;
951 }
952
953 limit_string[count] = '\0';
954
955 num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
956 &critical, &hot, &passive,
957 &active[0], &active[1], &active[2], &active[3], &active[4],
958 &active[5], &active[6], &active[7], &active[8],
959 &active[9]);
960 if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
961 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
962 count = -EINVAL;
963 goto end;
964 }
965
966 tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
967 tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
968 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
969 for (i = 0; i < num - 3; i++) {
970 if (!(tz->trips.active[i].flags.valid))
971 break;
972 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
973 }
974
975 end:
976 kfree(active);
977 kfree(limit_string);
978 return_VALUE(count);
979 }
980
981 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
982 {
983 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
984
985 ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show");
986
987 if (!tz)
988 goto end;
989
990 if (!tz->flags.cooling_mode) {
991 seq_puts(seq, "<setting not supported>\n");
992 }
993
994 if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
995 seq_printf(seq, "cooling mode: critical\n");
996 else
997 seq_printf(seq, "cooling mode: %s\n",
998 tz->cooling_mode ? "passive" : "active");
999
1000 end:
1001 return_VALUE(0);
1002 }
1003
1004 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1005 {
1006 return single_open(file, acpi_thermal_cooling_seq_show,
1007 PDE(inode)->data);
1008 }
1009
1010 static ssize_t
1011 acpi_thermal_write_cooling_mode(struct file *file,
1012 const char __user * buffer,
1013 size_t count, loff_t * ppos)
1014 {
1015 struct seq_file *m = (struct seq_file *)file->private_data;
1016 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1017 int result = 0;
1018 char mode_string[12] = { '\0' };
1019
1020 ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode");
1021
1022 if (!tz || (count > sizeof(mode_string) - 1))
1023 return_VALUE(-EINVAL);
1024
1025 if (!tz->flags.cooling_mode)
1026 return_VALUE(-ENODEV);
1027
1028 if (copy_from_user(mode_string, buffer, count))
1029 return_VALUE(-EFAULT);
1030
1031 mode_string[count] = '\0';
1032
1033 result = acpi_thermal_set_cooling_mode(tz,
1034 simple_strtoul(mode_string, NULL,
1035 0));
1036 if (result)
1037 return_VALUE(result);
1038
1039 acpi_thermal_check(tz);
1040
1041 return_VALUE(count);
1042 }
1043
1044 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1045 {
1046 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
1047
1048 ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show");
1049
1050 if (!tz)
1051 goto end;
1052
1053 if (!tz->polling_frequency) {
1054 seq_puts(seq, "<polling disabled>\n");
1055 goto end;
1056 }
1057
1058 seq_printf(seq, "polling frequency: %lu seconds\n",
1059 (tz->polling_frequency / 10));
1060
1061 end:
1062 return_VALUE(0);
1063 }
1064
1065 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1066 {
1067 return single_open(file, acpi_thermal_polling_seq_show,
1068 PDE(inode)->data);
1069 }
1070
1071 static ssize_t
1072 acpi_thermal_write_polling(struct file *file,
1073 const char __user * buffer,
1074 size_t count, loff_t * ppos)
1075 {
1076 struct seq_file *m = (struct seq_file *)file->private_data;
1077 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1078 int result = 0;
1079 char polling_string[12] = { '\0' };
1080 int seconds = 0;
1081
1082 ACPI_FUNCTION_TRACE("acpi_thermal_write_polling");
1083
1084 if (!tz || (count > sizeof(polling_string) - 1))
1085 return_VALUE(-EINVAL);
1086
1087 if (copy_from_user(polling_string, buffer, count))
1088 return_VALUE(-EFAULT);
1089
1090 polling_string[count] = '\0';
1091
1092 seconds = simple_strtoul(polling_string, NULL, 0);
1093
1094 result = acpi_thermal_set_polling(tz, seconds);
1095 if (result)
1096 return_VALUE(result);
1097
1098 acpi_thermal_check(tz);
1099
1100 return_VALUE(count);
1101 }
1102
1103 static int acpi_thermal_add_fs(struct acpi_device *device)
1104 {
1105 struct proc_dir_entry *entry = NULL;
1106
1107 ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
1108
1109 if (!acpi_device_dir(device)) {
1110 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1111 acpi_thermal_dir);
1112 if (!acpi_device_dir(device))
1113 return_VALUE(-ENODEV);
1114 acpi_device_dir(device)->owner = THIS_MODULE;
1115 }
1116
1117 /* 'state' [R] */
1118 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1119 S_IRUGO, acpi_device_dir(device));
1120 if (!entry)
1121 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1122 "Unable to create '%s' fs entry\n",
1123 ACPI_THERMAL_FILE_STATE));
1124 else {
1125 entry->proc_fops = &acpi_thermal_state_fops;
1126 entry->data = acpi_driver_data(device);
1127 entry->owner = THIS_MODULE;
1128 }
1129
1130 /* 'temperature' [R] */
1131 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1132 S_IRUGO, acpi_device_dir(device));
1133 if (!entry)
1134 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1135 "Unable to create '%s' fs entry\n",
1136 ACPI_THERMAL_FILE_TEMPERATURE));
1137 else {
1138 entry->proc_fops = &acpi_thermal_temp_fops;
1139 entry->data = acpi_driver_data(device);
1140 entry->owner = THIS_MODULE;
1141 }
1142
1143 /* 'trip_points' [R/W] */
1144 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1145 S_IFREG | S_IRUGO | S_IWUSR,
1146 acpi_device_dir(device));
1147 if (!entry)
1148 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1149 "Unable to create '%s' fs entry\n",
1150 ACPI_THERMAL_FILE_TRIP_POINTS));
1151 else {
1152 entry->proc_fops = &acpi_thermal_trip_fops;
1153 entry->data = acpi_driver_data(device);
1154 entry->owner = THIS_MODULE;
1155 }
1156
1157 /* 'cooling_mode' [R/W] */
1158 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1159 S_IFREG | S_IRUGO | S_IWUSR,
1160 acpi_device_dir(device));
1161 if (!entry)
1162 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1163 "Unable to create '%s' fs entry\n",
1164 ACPI_THERMAL_FILE_COOLING_MODE));
1165 else {
1166 entry->proc_fops = &acpi_thermal_cooling_fops;
1167 entry->data = acpi_driver_data(device);
1168 entry->owner = THIS_MODULE;
1169 }
1170
1171 /* 'polling_frequency' [R/W] */
1172 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1173 S_IFREG | S_IRUGO | S_IWUSR,
1174 acpi_device_dir(device));
1175 if (!entry)
1176 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1177 "Unable to create '%s' fs entry\n",
1178 ACPI_THERMAL_FILE_POLLING_FREQ));
1179 else {
1180 entry->proc_fops = &acpi_thermal_polling_fops;
1181 entry->data = acpi_driver_data(device);
1182 entry->owner = THIS_MODULE;
1183 }
1184
1185 return_VALUE(0);
1186 }
1187
1188 static int acpi_thermal_remove_fs(struct acpi_device *device)
1189 {
1190 ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
1191
1192 if (acpi_device_dir(device)) {
1193 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1194 acpi_device_dir(device));
1195 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1196 acpi_device_dir(device));
1197 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1198 acpi_device_dir(device));
1199 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1200 acpi_device_dir(device));
1201 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1202 acpi_device_dir(device));
1203 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1204 acpi_device_dir(device) = NULL;
1205 }
1206
1207 return_VALUE(0);
1208 }
1209
1210 /* --------------------------------------------------------------------------
1211 Driver Interface
1212 -------------------------------------------------------------------------- */
1213
1214 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1215 {
1216 struct acpi_thermal *tz = (struct acpi_thermal *)data;
1217 struct acpi_device *device = NULL;
1218
1219 ACPI_FUNCTION_TRACE("acpi_thermal_notify");
1220
1221 if (!tz)
1222 return_VOID;
1223
1224 if (acpi_bus_get_device(tz->handle, &device))
1225 return_VOID;
1226
1227 switch (event) {
1228 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1229 acpi_thermal_check(tz);
1230 break;
1231 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1232 acpi_thermal_get_trip_points(tz);
1233 acpi_thermal_check(tz);
1234 acpi_bus_generate_event(device, event, 0);
1235 break;
1236 case ACPI_THERMAL_NOTIFY_DEVICES:
1237 if (tz->flags.devices)
1238 acpi_thermal_get_devices(tz);
1239 acpi_bus_generate_event(device, event, 0);
1240 break;
1241 default:
1242 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1243 "Unsupported event [0x%x]\n", event));
1244 break;
1245 }
1246
1247 return_VOID;
1248 }
1249
1250 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1251 {
1252 int result = 0;
1253
1254 ACPI_FUNCTION_TRACE("acpi_thermal_get_info");
1255
1256 if (!tz)
1257 return_VALUE(-EINVAL);
1258
1259 /* Get temperature [_TMP] (required) */
1260 result = acpi_thermal_get_temperature(tz);
1261 if (result)
1262 return_VALUE(result);
1263
1264 /* Get trip points [_CRT, _PSV, etc.] (required) */
1265 result = acpi_thermal_get_trip_points(tz);
1266 if (result)
1267 return_VALUE(result);
1268
1269 /* Set the cooling mode [_SCP] to active cooling (default) */
1270 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1271 if (!result)
1272 tz->flags.cooling_mode = 1;
1273 else {
1274 /* Oh,we have not _SCP method.
1275 Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1276 tz->flags.cooling_mode = 0;
1277 if (tz->trips.active[0].flags.valid
1278 && tz->trips.passive.flags.valid) {
1279 if (tz->trips.passive.temperature >
1280 tz->trips.active[0].temperature)
1281 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1282 else
1283 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1284 } else if (!tz->trips.active[0].flags.valid
1285 && tz->trips.passive.flags.valid) {
1286 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1287 } else if (tz->trips.active[0].flags.valid
1288 && !tz->trips.passive.flags.valid) {
1289 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1290 } else {
1291 /* _ACx and _PSV are optional, but _CRT is required */
1292 tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1293 }
1294 }
1295
1296 /* Get default polling frequency [_TZP] (optional) */
1297 if (tzp)
1298 tz->polling_frequency = tzp;
1299 else
1300 acpi_thermal_get_polling_frequency(tz);
1301
1302 /* Get devices in this thermal zone [_TZD] (optional) */
1303 result = acpi_thermal_get_devices(tz);
1304 if (!result)
1305 tz->flags.devices = 1;
1306
1307 return_VALUE(0);
1308 }
1309
1310 static int acpi_thermal_add(struct acpi_device *device)
1311 {
1312 int result = 0;
1313 acpi_status status = AE_OK;
1314 struct acpi_thermal *tz = NULL;
1315
1316 ACPI_FUNCTION_TRACE("acpi_thermal_add");
1317
1318 if (!device)
1319 return_VALUE(-EINVAL);
1320
1321 tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1322 if (!tz)
1323 return_VALUE(-ENOMEM);
1324 memset(tz, 0, sizeof(struct acpi_thermal));
1325
1326 tz->handle = device->handle;
1327 strcpy(tz->name, device->pnp.bus_id);
1328 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1329 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1330 acpi_driver_data(device) = tz;
1331
1332 result = acpi_thermal_get_info(tz);
1333 if (result)
1334 goto end;
1335
1336 result = acpi_thermal_add_fs(device);
1337 if (result)
1338 return_VALUE(result);
1339
1340 init_timer(&tz->timer);
1341
1342 acpi_thermal_check(tz);
1343
1344 status = acpi_install_notify_handler(tz->handle,
1345 ACPI_DEVICE_NOTIFY,
1346 acpi_thermal_notify, tz);
1347 if (ACPI_FAILURE(status)) {
1348 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1349 "Error installing notify handler\n"));
1350 result = -ENODEV;
1351 goto end;
1352 }
1353
1354 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1355 acpi_device_name(device), acpi_device_bid(device),
1356 KELVIN_TO_CELSIUS(tz->temperature));
1357
1358 end:
1359 if (result) {
1360 acpi_thermal_remove_fs(device);
1361 kfree(tz);
1362 }
1363
1364 return_VALUE(result);
1365 }
1366
1367 static int acpi_thermal_remove(struct acpi_device *device, int type)
1368 {
1369 acpi_status status = AE_OK;
1370 struct acpi_thermal *tz = NULL;
1371
1372 ACPI_FUNCTION_TRACE("acpi_thermal_remove");
1373
1374 if (!device || !acpi_driver_data(device))
1375 return_VALUE(-EINVAL);
1376
1377 tz = (struct acpi_thermal *)acpi_driver_data(device);
1378
1379 /* avoid timer adding new defer task */
1380 tz->zombie = 1;
1381 /* wait for running timer (on other CPUs) finish */
1382 del_timer_sync(&(tz->timer));
1383 /* synchronize deferred task */
1384 acpi_os_wait_events_complete(NULL);
1385 /* deferred task may reinsert timer */
1386 del_timer_sync(&(tz->timer));
1387
1388 status = acpi_remove_notify_handler(tz->handle,
1389 ACPI_DEVICE_NOTIFY,
1390 acpi_thermal_notify);
1391 if (ACPI_FAILURE(status))
1392 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1393 "Error removing notify handler\n"));
1394
1395 /* Terminate policy */
1396 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1397 tz->trips.passive.flags.enabled = 0;
1398 acpi_thermal_passive(tz);
1399 }
1400 if (tz->trips.active[0].flags.valid
1401 && tz->trips.active[0].flags.enabled) {
1402 tz->trips.active[0].flags.enabled = 0;
1403 acpi_thermal_active(tz);
1404 }
1405
1406 acpi_thermal_remove_fs(device);
1407
1408 kfree(tz);
1409 return_VALUE(0);
1410 }
1411
1412 static int __init acpi_thermal_init(void)
1413 {
1414 int result = 0;
1415
1416 ACPI_FUNCTION_TRACE("acpi_thermal_init");
1417
1418 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1419 if (!acpi_thermal_dir)
1420 return_VALUE(-ENODEV);
1421 acpi_thermal_dir->owner = THIS_MODULE;
1422
1423 result = acpi_bus_register_driver(&acpi_thermal_driver);
1424 if (result < 0) {
1425 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1426 return_VALUE(-ENODEV);
1427 }
1428
1429 return_VALUE(0);
1430 }
1431
1432 static void __exit acpi_thermal_exit(void)
1433 {
1434 ACPI_FUNCTION_TRACE("acpi_thermal_exit");
1435
1436 acpi_bus_unregister_driver(&acpi_thermal_driver);
1437
1438 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1439
1440 return_VOID;
1441 }
1442
1443 module_init(acpi_thermal_init);
1444 module_exit(acpi_thermal_exit);
kernel-based virtual machine