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ACPI: create acpi_thermal_resume()
[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_resume(struct acpi_device *device, int state);
86 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
87 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
88 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
89 static ssize_t acpi_thermal_write_trip_points(struct file *,
90 const char __user *, size_t,
91 loff_t *);
92 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
93 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
94 const char __user *, size_t,
95 loff_t *);
96 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
97 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
98 size_t, loff_t *);
99
100 static struct acpi_driver acpi_thermal_driver = {
101 .name = ACPI_THERMAL_DRIVER_NAME,
102 .class = ACPI_THERMAL_CLASS,
103 .ids = ACPI_THERMAL_HID,
104 .ops = {
105 .add = acpi_thermal_add,
106 .remove = acpi_thermal_remove,
107 .resume = acpi_thermal_resume,
108 },
109 };
110
111 struct acpi_thermal_state {
112 u8 critical:1;
113 u8 hot:1;
114 u8 passive:1;
115 u8 active:1;
116 u8 reserved:4;
117 int active_index;
118 };
119
120 struct acpi_thermal_state_flags {
121 u8 valid:1;
122 u8 enabled:1;
123 u8 reserved:6;
124 };
125
126 struct acpi_thermal_critical {
127 struct acpi_thermal_state_flags flags;
128 unsigned long temperature;
129 };
130
131 struct acpi_thermal_hot {
132 struct acpi_thermal_state_flags flags;
133 unsigned long temperature;
134 };
135
136 struct acpi_thermal_passive {
137 struct acpi_thermal_state_flags flags;
138 unsigned long temperature;
139 unsigned long tc1;
140 unsigned long tc2;
141 unsigned long tsp;
142 struct acpi_handle_list devices;
143 };
144
145 struct acpi_thermal_active {
146 struct acpi_thermal_state_flags flags;
147 unsigned long temperature;
148 struct acpi_handle_list devices;
149 };
150
151 struct acpi_thermal_trips {
152 struct acpi_thermal_critical critical;
153 struct acpi_thermal_hot hot;
154 struct acpi_thermal_passive passive;
155 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
156 };
157
158 struct acpi_thermal_flags {
159 u8 cooling_mode:1; /* _SCP */
160 u8 devices:1; /* _TZD */
161 u8 reserved:6;
162 };
163
164 struct acpi_thermal {
165 acpi_handle handle;
166 acpi_bus_id name;
167 unsigned long temperature;
168 unsigned long last_temperature;
169 unsigned long polling_frequency;
170 u8 cooling_mode;
171 volatile u8 zombie;
172 struct acpi_thermal_flags flags;
173 struct acpi_thermal_state state;
174 struct acpi_thermal_trips trips;
175 struct acpi_handle_list devices;
176 struct timer_list timer;
177 };
178
179 static struct file_operations acpi_thermal_state_fops = {
180 .open = acpi_thermal_state_open_fs,
181 .read = seq_read,
182 .llseek = seq_lseek,
183 .release = single_release,
184 };
185
186 static struct file_operations acpi_thermal_temp_fops = {
187 .open = acpi_thermal_temp_open_fs,
188 .read = seq_read,
189 .llseek = seq_lseek,
190 .release = single_release,
191 };
192
193 static struct file_operations acpi_thermal_trip_fops = {
194 .open = acpi_thermal_trip_open_fs,
195 .read = seq_read,
196 .write = acpi_thermal_write_trip_points,
197 .llseek = seq_lseek,
198 .release = single_release,
199 };
200
201 static struct file_operations acpi_thermal_cooling_fops = {
202 .open = acpi_thermal_cooling_open_fs,
203 .read = seq_read,
204 .write = acpi_thermal_write_cooling_mode,
205 .llseek = seq_lseek,
206 .release = single_release,
207 };
208
209 static struct file_operations acpi_thermal_polling_fops = {
210 .open = acpi_thermal_polling_open_fs,
211 .read = seq_read,
212 .write = acpi_thermal_write_polling,
213 .llseek = seq_lseek,
214 .release = single_release,
215 };
216
217 /* --------------------------------------------------------------------------
218 Thermal Zone Management
219 -------------------------------------------------------------------------- */
220
221 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
222 {
223 acpi_status status = AE_OK;
224
225 ACPI_FUNCTION_TRACE("acpi_thermal_get_temperature");
226
227 if (!tz)
228 return_VALUE(-EINVAL);
229
230 tz->last_temperature = tz->temperature;
231
232 status =
233 acpi_evaluate_integer(tz->handle, "_TMP", NULL, &tz->temperature);
234 if (ACPI_FAILURE(status))
235 return_VALUE(-ENODEV);
236
237 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
238 tz->temperature));
239
240 return_VALUE(0);
241 }
242
243 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
244 {
245 acpi_status status = AE_OK;
246
247 ACPI_FUNCTION_TRACE("acpi_thermal_get_polling_frequency");
248
249 if (!tz)
250 return_VALUE(-EINVAL);
251
252 status =
253 acpi_evaluate_integer(tz->handle, "_TZP", NULL,
254 &tz->polling_frequency);
255 if (ACPI_FAILURE(status))
256 return_VALUE(-ENODEV);
257
258 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
259 tz->polling_frequency));
260
261 return_VALUE(0);
262 }
263
264 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
265 {
266 ACPI_FUNCTION_TRACE("acpi_thermal_set_polling");
267
268 if (!tz)
269 return_VALUE(-EINVAL);
270
271 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */
272
273 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
274 "Polling frequency set to %lu seconds\n",
275 tz->polling_frequency));
276
277 return_VALUE(0);
278 }
279
280 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
281 {
282 acpi_status status = AE_OK;
283 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
284 struct acpi_object_list arg_list = { 1, &arg0 };
285 acpi_handle handle = NULL;
286
287 ACPI_FUNCTION_TRACE("acpi_thermal_set_cooling_mode");
288
289 if (!tz)
290 return_VALUE(-EINVAL);
291
292 status = acpi_get_handle(tz->handle, "_SCP", &handle);
293 if (ACPI_FAILURE(status)) {
294 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
295 return_VALUE(-ENODEV);
296 }
297
298 arg0.integer.value = mode;
299
300 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
301 if (ACPI_FAILURE(status))
302 return_VALUE(-ENODEV);
303
304 tz->cooling_mode = mode;
305
306 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Cooling mode [%s]\n",
307 mode ? "passive" : "active"));
308
309 return_VALUE(0);
310 }
311
312 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
313 {
314 acpi_status status = AE_OK;
315 int i = 0;
316
317 ACPI_FUNCTION_TRACE("acpi_thermal_get_trip_points");
318
319 if (!tz)
320 return_VALUE(-EINVAL);
321
322 /* Critical Shutdown (required) */
323
324 status = acpi_evaluate_integer(tz->handle, "_CRT", NULL,
325 &tz->trips.critical.temperature);
326 if (ACPI_FAILURE(status)) {
327 tz->trips.critical.flags.valid = 0;
328 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "No critical threshold\n"));
329 return_VALUE(-ENODEV);
330 } else {
331 tz->trips.critical.flags.valid = 1;
332 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
333 "Found critical threshold [%lu]\n",
334 tz->trips.critical.temperature));
335 }
336
337 /* Critical Sleep (optional) */
338
339 status =
340 acpi_evaluate_integer(tz->handle, "_HOT", NULL,
341 &tz->trips.hot.temperature);
342 if (ACPI_FAILURE(status)) {
343 tz->trips.hot.flags.valid = 0;
344 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
345 } else {
346 tz->trips.hot.flags.valid = 1;
347 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
348 tz->trips.hot.temperature));
349 }
350
351 /* Passive: Processors (optional) */
352
353 status =
354 acpi_evaluate_integer(tz->handle, "_PSV", NULL,
355 &tz->trips.passive.temperature);
356 if (ACPI_FAILURE(status)) {
357 tz->trips.passive.flags.valid = 0;
358 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
359 } else {
360 tz->trips.passive.flags.valid = 1;
361
362 status =
363 acpi_evaluate_integer(tz->handle, "_TC1", NULL,
364 &tz->trips.passive.tc1);
365 if (ACPI_FAILURE(status))
366 tz->trips.passive.flags.valid = 0;
367
368 status =
369 acpi_evaluate_integer(tz->handle, "_TC2", NULL,
370 &tz->trips.passive.tc2);
371 if (ACPI_FAILURE(status))
372 tz->trips.passive.flags.valid = 0;
373
374 status =
375 acpi_evaluate_integer(tz->handle, "_TSP", NULL,
376 &tz->trips.passive.tsp);
377 if (ACPI_FAILURE(status))
378 tz->trips.passive.flags.valid = 0;
379
380 status =
381 acpi_evaluate_reference(tz->handle, "_PSL", NULL,
382 &tz->trips.passive.devices);
383 if (ACPI_FAILURE(status))
384 tz->trips.passive.flags.valid = 0;
385
386 if (!tz->trips.passive.flags.valid)
387 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
388 "Invalid passive threshold\n"));
389 else
390 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
391 "Found passive threshold [%lu]\n",
392 tz->trips.passive.temperature));
393 }
394
395 /* Active: Fans, etc. (optional) */
396
397 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
398
399 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
400
401 status =
402 acpi_evaluate_integer(tz->handle, name, NULL,
403 &tz->trips.active[i].temperature);
404 if (ACPI_FAILURE(status))
405 break;
406
407 name[2] = 'L';
408 status =
409 acpi_evaluate_reference(tz->handle, name, NULL,
410 &tz->trips.active[i].devices);
411 if (ACPI_SUCCESS(status)) {
412 tz->trips.active[i].flags.valid = 1;
413 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
414 "Found active threshold [%d]:[%lu]\n",
415 i, tz->trips.active[i].temperature));
416 } else
417 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
418 "Invalid active threshold [%d]\n",
419 i));
420 }
421
422 return_VALUE(0);
423 }
424
425 static int acpi_thermal_get_devices(struct acpi_thermal *tz)
426 {
427 acpi_status status = AE_OK;
428
429 ACPI_FUNCTION_TRACE("acpi_thermal_get_devices");
430
431 if (!tz)
432 return_VALUE(-EINVAL);
433
434 status =
435 acpi_evaluate_reference(tz->handle, "_TZD", NULL, &tz->devices);
436 if (ACPI_FAILURE(status))
437 return_VALUE(-ENODEV);
438
439 return_VALUE(0);
440 }
441
442 static int acpi_thermal_call_usermode(char *path)
443 {
444 char *argv[2] = { NULL, NULL };
445 char *envp[3] = { NULL, NULL, NULL };
446
447 ACPI_FUNCTION_TRACE("acpi_thermal_call_usermode");
448
449 if (!path)
450 return_VALUE(-EINVAL);
451
452 argv[0] = path;
453
454 /* minimal command environment */
455 envp[0] = "HOME=/";
456 envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
457
458 call_usermodehelper(argv[0], argv, envp, 0);
459
460 return_VALUE(0);
461 }
462
463 static int acpi_thermal_critical(struct acpi_thermal *tz)
464 {
465 int result = 0;
466 struct acpi_device *device = NULL;
467
468 ACPI_FUNCTION_TRACE("acpi_thermal_critical");
469
470 if (!tz || !tz->trips.critical.flags.valid)
471 return_VALUE(-EINVAL);
472
473 if (tz->temperature >= tz->trips.critical.temperature) {
474 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Critical trip point\n"));
475 tz->trips.critical.flags.enabled = 1;
476 } else if (tz->trips.critical.flags.enabled)
477 tz->trips.critical.flags.enabled = 0;
478
479 result = acpi_bus_get_device(tz->handle, &device);
480 if (result)
481 return_VALUE(result);
482
483 printk(KERN_EMERG
484 "Critical temperature reached (%ld C), shutting down.\n",
485 KELVIN_TO_CELSIUS(tz->temperature));
486 acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_CRITICAL,
487 tz->trips.critical.flags.enabled);
488
489 acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
490
491 return_VALUE(0);
492 }
493
494 static int acpi_thermal_hot(struct acpi_thermal *tz)
495 {
496 int result = 0;
497 struct acpi_device *device = NULL;
498
499 ACPI_FUNCTION_TRACE("acpi_thermal_hot");
500
501 if (!tz || !tz->trips.hot.flags.valid)
502 return_VALUE(-EINVAL);
503
504 if (tz->temperature >= tz->trips.hot.temperature) {
505 ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Hot trip point\n"));
506 tz->trips.hot.flags.enabled = 1;
507 } else if (tz->trips.hot.flags.enabled)
508 tz->trips.hot.flags.enabled = 0;
509
510 result = acpi_bus_get_device(tz->handle, &device);
511 if (result)
512 return_VALUE(result);
513
514 acpi_bus_generate_event(device, ACPI_THERMAL_NOTIFY_HOT,
515 tz->trips.hot.flags.enabled);
516
517 /* TBD: Call user-mode "sleep(S4)" function */
518
519 return_VALUE(0);
520 }
521
522 static void acpi_thermal_passive(struct acpi_thermal *tz)
523 {
524 int result = 1;
525 struct acpi_thermal_passive *passive = NULL;
526 int trend = 0;
527 int i = 0;
528
529 ACPI_FUNCTION_TRACE("acpi_thermal_passive");
530
531 if (!tz || !tz->trips.passive.flags.valid)
532 return;
533
534 passive = &(tz->trips.passive);
535
536 /*
537 * Above Trip?
538 * -----------
539 * Calculate the thermal trend (using the passive cooling equation)
540 * and modify the performance limit for all passive cooling devices
541 * accordingly. Note that we assume symmetry.
542 */
543 if (tz->temperature >= passive->temperature) {
544 trend =
545 (passive->tc1 * (tz->temperature - tz->last_temperature)) +
546 (passive->tc2 * (tz->temperature - passive->temperature));
547 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
548 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
549 trend, passive->tc1, tz->temperature,
550 tz->last_temperature, passive->tc2,
551 tz->temperature, passive->temperature));
552 passive->flags.enabled = 1;
553 /* Heating up? */
554 if (trend > 0)
555 for (i = 0; i < passive->devices.count; i++)
556 acpi_processor_set_thermal_limit(passive->
557 devices.
558 handles[i],
559 ACPI_PROCESSOR_LIMIT_INCREMENT);
560 /* Cooling off? */
561 else if (trend < 0) {
562 for (i = 0; i < passive->devices.count; i++)
563 /*
564 * assume that we are on highest
565 * freq/lowest thrott and can leave
566 * passive mode, even in error case
567 */
568 if (!acpi_processor_set_thermal_limit
569 (passive->devices.handles[i],
570 ACPI_PROCESSOR_LIMIT_DECREMENT))
571 result = 0;
572 /*
573 * Leave cooling mode, even if the temp might
574 * higher than trip point This is because some
575 * machines might have long thermal polling
576 * frequencies (tsp) defined. We will fall back
577 * into passive mode in next cycle (probably quicker)
578 */
579 if (result) {
580 passive->flags.enabled = 0;
581 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
582 "Disabling passive cooling, still above threshold,"
583 " but we are cooling down\n"));
584 }
585 }
586 return;
587 }
588
589 /*
590 * Below Trip?
591 * -----------
592 * Implement passive cooling hysteresis to slowly increase performance
593 * and avoid thrashing around the passive trip point. Note that we
594 * assume symmetry.
595 */
596 if (!passive->flags.enabled)
597 return;
598 for (i = 0; i < passive->devices.count; i++)
599 if (!acpi_processor_set_thermal_limit
600 (passive->devices.handles[i],
601 ACPI_PROCESSOR_LIMIT_DECREMENT))
602 result = 0;
603 if (result) {
604 passive->flags.enabled = 0;
605 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
606 "Disabling passive cooling (zone is cool)\n"));
607 }
608 }
609
610 static void acpi_thermal_active(struct acpi_thermal *tz)
611 {
612 int result = 0;
613 struct acpi_thermal_active *active = NULL;
614 int i = 0;
615 int j = 0;
616 unsigned long maxtemp = 0;
617
618 ACPI_FUNCTION_TRACE("acpi_thermal_active");
619
620 if (!tz)
621 return;
622
623 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
624 active = &(tz->trips.active[i]);
625 if (!active || !active->flags.valid)
626 break;
627 if (tz->temperature >= active->temperature) {
628 /*
629 * Above Threshold?
630 * ----------------
631 * If not already enabled, turn ON all cooling devices
632 * associated with this active threshold.
633 */
634 if (active->temperature > maxtemp)
635 tz->state.active_index = i;
636 maxtemp = active->temperature;
637 if (active->flags.enabled)
638 continue;
639 for (j = 0; j < active->devices.count; j++) {
640 result =
641 acpi_bus_set_power(active->devices.
642 handles[j],
643 ACPI_STATE_D0);
644 if (result) {
645 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
646 "Unable to turn cooling device [%p] 'on'\n",
647 active->devices.
648 handles[j]));
649 continue;
650 }
651 active->flags.enabled = 1;
652 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
653 "Cooling device [%p] now 'on'\n",
654 active->devices.handles[j]));
655 }
656 continue;
657 }
658 if (!active->flags.enabled)
659 continue;
660 /*
661 * Below Threshold?
662 * ----------------
663 * Turn OFF all cooling devices associated with this
664 * threshold.
665 */
666 for (j = 0; j < active->devices.count; j++) {
667 result = acpi_bus_set_power(active->devices.handles[j],
668 ACPI_STATE_D3);
669 if (result) {
670 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
671 "Unable to turn cooling device [%p] 'off'\n",
672 active->devices.handles[j]));
673 continue;
674 }
675 active->flags.enabled = 0;
676 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
677 "Cooling device [%p] now 'off'\n",
678 active->devices.handles[j]));
679 }
680 }
681 }
682
683 static void acpi_thermal_check(void *context);
684
685 static void acpi_thermal_run(unsigned long data)
686 {
687 struct acpi_thermal *tz = (struct acpi_thermal *)data;
688 if (!tz->zombie)
689 acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
690 acpi_thermal_check, (void *)data);
691 }
692
693 static void acpi_thermal_check(void *data)
694 {
695 int result = 0;
696 struct acpi_thermal *tz = (struct acpi_thermal *)data;
697 unsigned long sleep_time = 0;
698 int i = 0;
699 struct acpi_thermal_state state;
700
701 ACPI_FUNCTION_TRACE("acpi_thermal_check");
702
703 if (!tz) {
704 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
705 return_VOID;
706 }
707
708 state = tz->state;
709
710 result = acpi_thermal_get_temperature(tz);
711 if (result)
712 return_VOID;
713
714 memset(&tz->state, 0, sizeof(tz->state));
715
716 /*
717 * Check Trip Points
718 * -----------------
719 * Compare the current temperature to the trip point values to see
720 * if we've entered one of the thermal policy states. Note that
721 * this function determines when a state is entered, but the
722 * individual policy decides when it is exited (e.g. hysteresis).
723 */
724 if (tz->trips.critical.flags.valid)
725 state.critical |=
726 (tz->temperature >= tz->trips.critical.temperature);
727 if (tz->trips.hot.flags.valid)
728 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
729 if (tz->trips.passive.flags.valid)
730 state.passive |=
731 (tz->temperature >= tz->trips.passive.temperature);
732 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
733 if (tz->trips.active[i].flags.valid)
734 state.active |=
735 (tz->temperature >=
736 tz->trips.active[i].temperature);
737
738 /*
739 * Invoke Policy
740 * -------------
741 * Separated from the above check to allow individual policy to
742 * determine when to exit a given state.
743 */
744 if (state.critical)
745 acpi_thermal_critical(tz);
746 if (state.hot)
747 acpi_thermal_hot(tz);
748 if (state.passive)
749 acpi_thermal_passive(tz);
750 if (state.active)
751 acpi_thermal_active(tz);
752
753 /*
754 * Calculate State
755 * ---------------
756 * Again, separated from the above two to allow independent policy
757 * decisions.
758 */
759 tz->state.critical = tz->trips.critical.flags.enabled;
760 tz->state.hot = tz->trips.hot.flags.enabled;
761 tz->state.passive = tz->trips.passive.flags.enabled;
762 tz->state.active = 0;
763 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
764 tz->state.active |= tz->trips.active[i].flags.enabled;
765
766 /*
767 * Calculate Sleep Time
768 * --------------------
769 * If we're in the passive state, use _TSP's value. Otherwise
770 * use the default polling frequency (e.g. _TZP). If no polling
771 * frequency is specified then we'll wait forever (at least until
772 * a thermal event occurs). Note that _TSP and _TZD values are
773 * given in 1/10th seconds (we must covert to milliseconds).
774 */
775 if (tz->state.passive)
776 sleep_time = tz->trips.passive.tsp * 100;
777 else if (tz->polling_frequency > 0)
778 sleep_time = tz->polling_frequency * 100;
779
780 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
781 tz->name, tz->temperature, sleep_time));
782
783 /*
784 * Schedule Next Poll
785 * ------------------
786 */
787 if (!sleep_time) {
788 if (timer_pending(&(tz->timer)))
789 del_timer(&(tz->timer));
790 } else {
791 if (timer_pending(&(tz->timer)))
792 mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
793 else {
794 tz->timer.data = (unsigned long)tz;
795 tz->timer.function = acpi_thermal_run;
796 tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
797 add_timer(&(tz->timer));
798 }
799 }
800
801 return_VOID;
802 }
803
804 /* --------------------------------------------------------------------------
805 FS Interface (/proc)
806 -------------------------------------------------------------------------- */
807
808 static struct proc_dir_entry *acpi_thermal_dir;
809
810 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
811 {
812 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
813
814 ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show");
815
816 if (!tz)
817 goto end;
818
819 seq_puts(seq, "state: ");
820
821 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
822 && !tz->state.active)
823 seq_puts(seq, "ok\n");
824 else {
825 if (tz->state.critical)
826 seq_puts(seq, "critical ");
827 if (tz->state.hot)
828 seq_puts(seq, "hot ");
829 if (tz->state.passive)
830 seq_puts(seq, "passive ");
831 if (tz->state.active)
832 seq_printf(seq, "active[%d]", tz->state.active_index);
833 seq_puts(seq, "\n");
834 }
835
836 end:
837 return_VALUE(0);
838 }
839
840 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
841 {
842 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
843 }
844
845 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
846 {
847 int result = 0;
848 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
849
850 ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show");
851
852 if (!tz)
853 goto end;
854
855 result = acpi_thermal_get_temperature(tz);
856 if (result)
857 goto end;
858
859 seq_printf(seq, "temperature: %ld C\n",
860 KELVIN_TO_CELSIUS(tz->temperature));
861
862 end:
863 return_VALUE(0);
864 }
865
866 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
867 {
868 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
869 }
870
871 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
872 {
873 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
874 int i = 0;
875 int j = 0;
876
877 ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show");
878
879 if (!tz)
880 goto end;
881
882 if (tz->trips.critical.flags.valid)
883 seq_printf(seq, "critical (S5): %ld C\n",
884 KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
885
886 if (tz->trips.hot.flags.valid)
887 seq_printf(seq, "hot (S4): %ld C\n",
888 KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
889
890 if (tz->trips.passive.flags.valid) {
891 seq_printf(seq,
892 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
893 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
894 tz->trips.passive.tc1, tz->trips.passive.tc2,
895 tz->trips.passive.tsp);
896 for (j = 0; j < tz->trips.passive.devices.count; j++) {
897
898 seq_printf(seq, "0x%p ",
899 tz->trips.passive.devices.handles[j]);
900 }
901 seq_puts(seq, "\n");
902 }
903
904 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
905 if (!(tz->trips.active[i].flags.valid))
906 break;
907 seq_printf(seq, "active[%d]: %ld C: devices=",
908 i,
909 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
910 for (j = 0; j < tz->trips.active[i].devices.count; j++)
911 seq_printf(seq, "0x%p ",
912 tz->trips.active[i].devices.handles[j]);
913 seq_puts(seq, "\n");
914 }
915
916 end:
917 return_VALUE(0);
918 }
919
920 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
921 {
922 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
923 }
924
925 static ssize_t
926 acpi_thermal_write_trip_points(struct file *file,
927 const char __user * buffer,
928 size_t count, loff_t * ppos)
929 {
930 struct seq_file *m = (struct seq_file *)file->private_data;
931 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
932
933 char *limit_string;
934 int num, critical, hot, passive;
935 int *active;
936 int i = 0;
937
938 ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points");
939
940 limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
941 if (!limit_string)
942 return_VALUE(-ENOMEM);
943
944 memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN);
945
946 active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
947 if (!active)
948 return_VALUE(-ENOMEM);
949
950 if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
951 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
952 count = -EINVAL;
953 goto end;
954 }
955
956 if (copy_from_user(limit_string, buffer, count)) {
957 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
958 count = -EFAULT;
959 goto end;
960 }
961
962 limit_string[count] = '\0';
963
964 num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
965 &critical, &hot, &passive,
966 &active[0], &active[1], &active[2], &active[3], &active[4],
967 &active[5], &active[6], &active[7], &active[8],
968 &active[9]);
969 if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
970 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
971 count = -EINVAL;
972 goto end;
973 }
974
975 tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
976 tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
977 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
978 for (i = 0; i < num - 3; i++) {
979 if (!(tz->trips.active[i].flags.valid))
980 break;
981 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
982 }
983
984 end:
985 kfree(active);
986 kfree(limit_string);
987 return_VALUE(count);
988 }
989
990 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
991 {
992 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
993
994 ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show");
995
996 if (!tz)
997 goto end;
998
999 if (!tz->flags.cooling_mode) {
1000 seq_puts(seq, "<setting not supported>\n");
1001 }
1002
1003 if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
1004 seq_printf(seq, "cooling mode: critical\n");
1005 else
1006 seq_printf(seq, "cooling mode: %s\n",
1007 tz->cooling_mode ? "passive" : "active");
1008
1009 end:
1010 return_VALUE(0);
1011 }
1012
1013 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1014 {
1015 return single_open(file, acpi_thermal_cooling_seq_show,
1016 PDE(inode)->data);
1017 }
1018
1019 static ssize_t
1020 acpi_thermal_write_cooling_mode(struct file *file,
1021 const char __user * buffer,
1022 size_t count, loff_t * ppos)
1023 {
1024 struct seq_file *m = (struct seq_file *)file->private_data;
1025 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1026 int result = 0;
1027 char mode_string[12] = { '\0' };
1028
1029 ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode");
1030
1031 if (!tz || (count > sizeof(mode_string) - 1))
1032 return_VALUE(-EINVAL);
1033
1034 if (!tz->flags.cooling_mode)
1035 return_VALUE(-ENODEV);
1036
1037 if (copy_from_user(mode_string, buffer, count))
1038 return_VALUE(-EFAULT);
1039
1040 mode_string[count] = '\0';
1041
1042 result = acpi_thermal_set_cooling_mode(tz,
1043 simple_strtoul(mode_string, NULL,
1044 0));
1045 if (result)
1046 return_VALUE(result);
1047
1048 acpi_thermal_check(tz);
1049
1050 return_VALUE(count);
1051 }
1052
1053 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1054 {
1055 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
1056
1057 ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show");
1058
1059 if (!tz)
1060 goto end;
1061
1062 if (!tz->polling_frequency) {
1063 seq_puts(seq, "<polling disabled>\n");
1064 goto end;
1065 }
1066
1067 seq_printf(seq, "polling frequency: %lu seconds\n",
1068 (tz->polling_frequency / 10));
1069
1070 end:
1071 return_VALUE(0);
1072 }
1073
1074 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1075 {
1076 return single_open(file, acpi_thermal_polling_seq_show,
1077 PDE(inode)->data);
1078 }
1079
1080 static ssize_t
1081 acpi_thermal_write_polling(struct file *file,
1082 const char __user * buffer,
1083 size_t count, loff_t * ppos)
1084 {
1085 struct seq_file *m = (struct seq_file *)file->private_data;
1086 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1087 int result = 0;
1088 char polling_string[12] = { '\0' };
1089 int seconds = 0;
1090
1091 ACPI_FUNCTION_TRACE("acpi_thermal_write_polling");
1092
1093 if (!tz || (count > sizeof(polling_string) - 1))
1094 return_VALUE(-EINVAL);
1095
1096 if (copy_from_user(polling_string, buffer, count))
1097 return_VALUE(-EFAULT);
1098
1099 polling_string[count] = '\0';
1100
1101 seconds = simple_strtoul(polling_string, NULL, 0);
1102
1103 result = acpi_thermal_set_polling(tz, seconds);
1104 if (result)
1105 return_VALUE(result);
1106
1107 acpi_thermal_check(tz);
1108
1109 return_VALUE(count);
1110 }
1111
1112 static int acpi_thermal_add_fs(struct acpi_device *device)
1113 {
1114 struct proc_dir_entry *entry = NULL;
1115
1116 ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
1117
1118 if (!acpi_device_dir(device)) {
1119 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1120 acpi_thermal_dir);
1121 if (!acpi_device_dir(device))
1122 return_VALUE(-ENODEV);
1123 acpi_device_dir(device)->owner = THIS_MODULE;
1124 }
1125
1126 /* 'state' [R] */
1127 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1128 S_IRUGO, acpi_device_dir(device));
1129 if (!entry)
1130 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1131 "Unable to create '%s' fs entry\n",
1132 ACPI_THERMAL_FILE_STATE));
1133 else {
1134 entry->proc_fops = &acpi_thermal_state_fops;
1135 entry->data = acpi_driver_data(device);
1136 entry->owner = THIS_MODULE;
1137 }
1138
1139 /* 'temperature' [R] */
1140 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1141 S_IRUGO, acpi_device_dir(device));
1142 if (!entry)
1143 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1144 "Unable to create '%s' fs entry\n",
1145 ACPI_THERMAL_FILE_TEMPERATURE));
1146 else {
1147 entry->proc_fops = &acpi_thermal_temp_fops;
1148 entry->data = acpi_driver_data(device);
1149 entry->owner = THIS_MODULE;
1150 }
1151
1152 /* 'trip_points' [R/W] */
1153 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1154 S_IFREG | S_IRUGO | S_IWUSR,
1155 acpi_device_dir(device));
1156 if (!entry)
1157 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1158 "Unable to create '%s' fs entry\n",
1159 ACPI_THERMAL_FILE_TRIP_POINTS));
1160 else {
1161 entry->proc_fops = &acpi_thermal_trip_fops;
1162 entry->data = acpi_driver_data(device);
1163 entry->owner = THIS_MODULE;
1164 }
1165
1166 /* 'cooling_mode' [R/W] */
1167 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1168 S_IFREG | S_IRUGO | S_IWUSR,
1169 acpi_device_dir(device));
1170 if (!entry)
1171 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1172 "Unable to create '%s' fs entry\n",
1173 ACPI_THERMAL_FILE_COOLING_MODE));
1174 else {
1175 entry->proc_fops = &acpi_thermal_cooling_fops;
1176 entry->data = acpi_driver_data(device);
1177 entry->owner = THIS_MODULE;
1178 }
1179
1180 /* 'polling_frequency' [R/W] */
1181 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1182 S_IFREG | S_IRUGO | S_IWUSR,
1183 acpi_device_dir(device));
1184 if (!entry)
1185 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1186 "Unable to create '%s' fs entry\n",
1187 ACPI_THERMAL_FILE_POLLING_FREQ));
1188 else {
1189 entry->proc_fops = &acpi_thermal_polling_fops;
1190 entry->data = acpi_driver_data(device);
1191 entry->owner = THIS_MODULE;
1192 }
1193
1194 return_VALUE(0);
1195 }
1196
1197 static int acpi_thermal_remove_fs(struct acpi_device *device)
1198 {
1199 ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
1200
1201 if (acpi_device_dir(device)) {
1202 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1203 acpi_device_dir(device));
1204 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1205 acpi_device_dir(device));
1206 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1207 acpi_device_dir(device));
1208 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1209 acpi_device_dir(device));
1210 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1211 acpi_device_dir(device));
1212 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1213 acpi_device_dir(device) = NULL;
1214 }
1215
1216 return_VALUE(0);
1217 }
1218
1219 /* --------------------------------------------------------------------------
1220 Driver Interface
1221 -------------------------------------------------------------------------- */
1222
1223 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1224 {
1225 struct acpi_thermal *tz = (struct acpi_thermal *)data;
1226 struct acpi_device *device = NULL;
1227
1228 ACPI_FUNCTION_TRACE("acpi_thermal_notify");
1229
1230 if (!tz)
1231 return_VOID;
1232
1233 if (acpi_bus_get_device(tz->handle, &device))
1234 return_VOID;
1235
1236 switch (event) {
1237 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1238 acpi_thermal_check(tz);
1239 break;
1240 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1241 acpi_thermal_get_trip_points(tz);
1242 acpi_thermal_check(tz);
1243 acpi_bus_generate_event(device, event, 0);
1244 break;
1245 case ACPI_THERMAL_NOTIFY_DEVICES:
1246 if (tz->flags.devices)
1247 acpi_thermal_get_devices(tz);
1248 acpi_bus_generate_event(device, event, 0);
1249 break;
1250 default:
1251 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1252 "Unsupported event [0x%x]\n", event));
1253 break;
1254 }
1255
1256 return_VOID;
1257 }
1258
1259 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1260 {
1261 int result = 0;
1262
1263 ACPI_FUNCTION_TRACE("acpi_thermal_get_info");
1264
1265 if (!tz)
1266 return_VALUE(-EINVAL);
1267
1268 /* Get temperature [_TMP] (required) */
1269 result = acpi_thermal_get_temperature(tz);
1270 if (result)
1271 return_VALUE(result);
1272
1273 /* Get trip points [_CRT, _PSV, etc.] (required) */
1274 result = acpi_thermal_get_trip_points(tz);
1275 if (result)
1276 return_VALUE(result);
1277
1278 /* Set the cooling mode [_SCP] to active cooling (default) */
1279 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1280 if (!result)
1281 tz->flags.cooling_mode = 1;
1282 else {
1283 /* Oh,we have not _SCP method.
1284 Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1285 tz->flags.cooling_mode = 0;
1286 if (tz->trips.active[0].flags.valid
1287 && tz->trips.passive.flags.valid) {
1288 if (tz->trips.passive.temperature >
1289 tz->trips.active[0].temperature)
1290 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1291 else
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_PASSIVE;
1296 } else if (tz->trips.active[0].flags.valid
1297 && !tz->trips.passive.flags.valid) {
1298 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1299 } else {
1300 /* _ACx and _PSV are optional, but _CRT is required */
1301 tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1302 }
1303 }
1304
1305 /* Get default polling frequency [_TZP] (optional) */
1306 if (tzp)
1307 tz->polling_frequency = tzp;
1308 else
1309 acpi_thermal_get_polling_frequency(tz);
1310
1311 /* Get devices in this thermal zone [_TZD] (optional) */
1312 result = acpi_thermal_get_devices(tz);
1313 if (!result)
1314 tz->flags.devices = 1;
1315
1316 return_VALUE(0);
1317 }
1318
1319 static int acpi_thermal_add(struct acpi_device *device)
1320 {
1321 int result = 0;
1322 acpi_status status = AE_OK;
1323 struct acpi_thermal *tz = NULL;
1324
1325 ACPI_FUNCTION_TRACE("acpi_thermal_add");
1326
1327 if (!device)
1328 return_VALUE(-EINVAL);
1329
1330 tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1331 if (!tz)
1332 return_VALUE(-ENOMEM);
1333 memset(tz, 0, sizeof(struct acpi_thermal));
1334
1335 tz->handle = device->handle;
1336 strcpy(tz->name, device->pnp.bus_id);
1337 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1338 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1339 acpi_driver_data(device) = tz;
1340
1341 result = acpi_thermal_get_info(tz);
1342 if (result)
1343 goto end;
1344
1345 result = acpi_thermal_add_fs(device);
1346 if (result)
1347 return_VALUE(result);
1348
1349 init_timer(&tz->timer);
1350
1351 acpi_thermal_check(tz);
1352
1353 status = acpi_install_notify_handler(tz->handle,
1354 ACPI_DEVICE_NOTIFY,
1355 acpi_thermal_notify, tz);
1356 if (ACPI_FAILURE(status)) {
1357 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1358 "Error installing notify handler\n"));
1359 result = -ENODEV;
1360 goto end;
1361 }
1362
1363 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1364 acpi_device_name(device), acpi_device_bid(device),
1365 KELVIN_TO_CELSIUS(tz->temperature));
1366
1367 end:
1368 if (result) {
1369 acpi_thermal_remove_fs(device);
1370 kfree(tz);
1371 }
1372
1373 return_VALUE(result);
1374 }
1375
1376 static int acpi_thermal_remove(struct acpi_device *device, int type)
1377 {
1378 acpi_status status = AE_OK;
1379 struct acpi_thermal *tz = NULL;
1380
1381 ACPI_FUNCTION_TRACE("acpi_thermal_remove");
1382
1383 if (!device || !acpi_driver_data(device))
1384 return_VALUE(-EINVAL);
1385
1386 tz = (struct acpi_thermal *)acpi_driver_data(device);
1387
1388 /* avoid timer adding new defer task */
1389 tz->zombie = 1;
1390 /* wait for running timer (on other CPUs) finish */
1391 del_timer_sync(&(tz->timer));
1392 /* synchronize deferred task */
1393 acpi_os_wait_events_complete(NULL);
1394 /* deferred task may reinsert timer */
1395 del_timer_sync(&(tz->timer));
1396
1397 status = acpi_remove_notify_handler(tz->handle,
1398 ACPI_DEVICE_NOTIFY,
1399 acpi_thermal_notify);
1400 if (ACPI_FAILURE(status))
1401 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1402 "Error removing notify handler\n"));
1403
1404 /* Terminate policy */
1405 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1406 tz->trips.passive.flags.enabled = 0;
1407 acpi_thermal_passive(tz);
1408 }
1409 if (tz->trips.active[0].flags.valid
1410 && tz->trips.active[0].flags.enabled) {
1411 tz->trips.active[0].flags.enabled = 0;
1412 acpi_thermal_active(tz);
1413 }
1414
1415 acpi_thermal_remove_fs(device);
1416
1417 kfree(tz);
1418 return_VALUE(0);
1419 }
1420
1421 static int acpi_thermal_resume(struct acpi_device *device, int state)
1422 {
1423 struct acpi_thermal *tz = NULL;
1424
1425 if (!device || !acpi_driver_data(device))
1426 return_VALUE(-EINVAL);
1427
1428 tz = (struct acpi_thermal *)acpi_driver_data(device);
1429
1430 acpi_thermal_check(tz);
1431
1432 return AE_OK;
1433 }
1434
1435 static int __init acpi_thermal_init(void)
1436 {
1437 int result = 0;
1438
1439 ACPI_FUNCTION_TRACE("acpi_thermal_init");
1440
1441 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1442 if (!acpi_thermal_dir)
1443 return_VALUE(-ENODEV);
1444 acpi_thermal_dir->owner = THIS_MODULE;
1445
1446 result = acpi_bus_register_driver(&acpi_thermal_driver);
1447 if (result < 0) {
1448 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1449 return_VALUE(-ENODEV);
1450 }
1451
1452 return_VALUE(0);
1453 }
1454
1455 static void __exit acpi_thermal_exit(void)
1456 {
1457 ACPI_FUNCTION_TRACE("acpi_thermal_exit");
1458
1459 acpi_bus_unregister_driver(&acpi_thermal_driver);
1460
1461 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1462
1463 return_VOID;
1464 }
1465
1466 module_init(acpi_thermal_init);
1467 module_exit(acpi_thermal_exit);
Linux kernel - Deliverables
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