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[ACPI] Allow return to active cooling mode once passive mode is entered
[linux-2.6/mini2440.git] / drivers / acpi / thermal.c
blob19f3ea48475e369ec9ba1b39405e5d14da9a2e6f
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_queue_for_execution(OSD_PRIORITY_GPE,
688 acpi_thermal_check, (void *)data);
689 }
690
691 static void acpi_thermal_check(void *data)
692 {
693 int result = 0;
694 struct acpi_thermal *tz = (struct acpi_thermal *)data;
695 unsigned long sleep_time = 0;
696 int i = 0;
697 struct acpi_thermal_state state;
698
699 ACPI_FUNCTION_TRACE("acpi_thermal_check");
700
701 if (!tz) {
702 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
703 return_VOID;
704 }
705
706 state = tz->state;
707
708 result = acpi_thermal_get_temperature(tz);
709 if (result)
710 return_VOID;
711
712 memset(&tz->state, 0, sizeof(tz->state));
713
714 /*
715 * Check Trip Points
716 * -----------------
717 * Compare the current temperature to the trip point values to see
718 * if we've entered one of the thermal policy states. Note that
719 * this function determines when a state is entered, but the
720 * individual policy decides when it is exited (e.g. hysteresis).
721 */
722 if (tz->trips.critical.flags.valid)
723 state.critical |=
724 (tz->temperature >= tz->trips.critical.temperature);
725 if (tz->trips.hot.flags.valid)
726 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
727 if (tz->trips.passive.flags.valid)
728 state.passive |=
729 (tz->temperature >= tz->trips.passive.temperature);
730 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
731 if (tz->trips.active[i].flags.valid)
732 state.active |=
733 (tz->temperature >=
734 tz->trips.active[i].temperature);
735
736 /*
737 * Invoke Policy
738 * -------------
739 * Separated from the above check to allow individual policy to
740 * determine when to exit a given state.
741 */
742 if (state.critical)
743 acpi_thermal_critical(tz);
744 if (state.hot)
745 acpi_thermal_hot(tz);
746 if (state.passive)
747 acpi_thermal_passive(tz);
748 if (state.active)
749 acpi_thermal_active(tz);
750
751 /*
752 * Calculate State
753 * ---------------
754 * Again, separated from the above two to allow independent policy
755 * decisions.
756 */
757 tz->state.critical = tz->trips.critical.flags.enabled;
758 tz->state.hot = tz->trips.hot.flags.enabled;
759 tz->state.passive = tz->trips.passive.flags.enabled;
760 tz->state.active = 0;
761 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
762 tz->state.active |= tz->trips.active[i].flags.enabled;
763
764 /*
765 * Calculate Sleep Time
766 * --------------------
767 * If we're in the passive state, use _TSP's value. Otherwise
768 * use the default polling frequency (e.g. _TZP). If no polling
769 * frequency is specified then we'll wait forever (at least until
770 * a thermal event occurs). Note that _TSP and _TZD values are
771 * given in 1/10th seconds (we must covert to milliseconds).
772 */
773 if (tz->state.passive)
774 sleep_time = tz->trips.passive.tsp * 100;
775 else if (tz->polling_frequency > 0)
776 sleep_time = tz->polling_frequency * 100;
777
778 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
779 tz->name, tz->temperature, sleep_time));
780
781 /*
782 * Schedule Next Poll
783 * ------------------
784 */
785 if (!sleep_time) {
786 if (timer_pending(&(tz->timer)))
787 del_timer(&(tz->timer));
788 } else {
789 if (timer_pending(&(tz->timer)))
790 mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
791 else {
792 tz->timer.data = (unsigned long)tz;
793 tz->timer.function = acpi_thermal_run;
794 tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
795 add_timer(&(tz->timer));
796 }
797 }
798
799 return_VOID;
800 }
801
802 /* --------------------------------------------------------------------------
803 FS Interface (/proc)
804 -------------------------------------------------------------------------- */
805
806 static struct proc_dir_entry *acpi_thermal_dir;
807
808 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
809 {
810 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
811
812 ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show");
813
814 if (!tz)
815 goto end;
816
817 seq_puts(seq, "state: ");
818
819 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
820 && !tz->state.active)
821 seq_puts(seq, "ok\n");
822 else {
823 if (tz->state.critical)
824 seq_puts(seq, "critical ");
825 if (tz->state.hot)
826 seq_puts(seq, "hot ");
827 if (tz->state.passive)
828 seq_puts(seq, "passive ");
829 if (tz->state.active)
830 seq_printf(seq, "active[%d]", tz->state.active_index);
831 seq_puts(seq, "\n");
832 }
833
834 end:
835 return_VALUE(0);
836 }
837
838 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
839 {
840 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
841 }
842
843 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
844 {
845 int result = 0;
846 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
847
848 ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show");
849
850 if (!tz)
851 goto end;
852
853 result = acpi_thermal_get_temperature(tz);
854 if (result)
855 goto end;
856
857 seq_printf(seq, "temperature: %ld C\n",
858 KELVIN_TO_CELSIUS(tz->temperature));
859
860 end:
861 return_VALUE(0);
862 }
863
864 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
865 {
866 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
867 }
868
869 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
870 {
871 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
872 int i = 0;
873 int j = 0;
874
875 ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show");
876
877 if (!tz)
878 goto end;
879
880 if (tz->trips.critical.flags.valid)
881 seq_printf(seq, "critical (S5): %ld C\n",
882 KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
883
884 if (tz->trips.hot.flags.valid)
885 seq_printf(seq, "hot (S4): %ld C\n",
886 KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
887
888 if (tz->trips.passive.flags.valid) {
889 seq_printf(seq,
890 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
891 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
892 tz->trips.passive.tc1, tz->trips.passive.tc2,
893 tz->trips.passive.tsp);
894 for (j = 0; j < tz->trips.passive.devices.count; j++) {
895
896 seq_printf(seq, "0x%p ",
897 tz->trips.passive.devices.handles[j]);
898 }
899 seq_puts(seq, "\n");
900 }
901
902 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
903 if (!(tz->trips.active[i].flags.valid))
904 break;
905 seq_printf(seq, "active[%d]: %ld C: devices=",
906 i,
907 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
908 for (j = 0; j < tz->trips.active[i].devices.count; j++)
909 seq_printf(seq, "0x%p ",
910 tz->trips.active[i].devices.handles[j]);
911 seq_puts(seq, "\n");
912 }
913
914 end:
915 return_VALUE(0);
916 }
917
918 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
919 {
920 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
921 }
922
923 static ssize_t
924 acpi_thermal_write_trip_points(struct file *file,
925 const char __user * buffer,
926 size_t count, loff_t * ppos)
927 {
928 struct seq_file *m = (struct seq_file *)file->private_data;
929 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
930
931 char *limit_string;
932 int num, critical, hot, passive;
933 int *active;
934 int i = 0;
935
936 ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points");
937
938 limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
939 if (!limit_string)
940 return_VALUE(-ENOMEM);
941
942 memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN);
943
944 active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
945 if (!active)
946 return_VALUE(-ENOMEM);
947
948 if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
949 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
950 count = -EINVAL;
951 goto end;
952 }
953
954 if (copy_from_user(limit_string, buffer, count)) {
955 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
956 count = -EFAULT;
957 goto end;
958 }
959
960 limit_string[count] = '\0';
961
962 num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
963 &critical, &hot, &passive,
964 &active[0], &active[1], &active[2], &active[3], &active[4],
965 &active[5], &active[6], &active[7], &active[8],
966 &active[9]);
967 if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
968 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
969 count = -EINVAL;
970 goto end;
971 }
972
973 tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
974 tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
975 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
976 for (i = 0; i < num - 3; i++) {
977 if (!(tz->trips.active[i].flags.valid))
978 break;
979 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
980 }
981
982 end:
983 kfree(active);
984 kfree(limit_string);
985 return_VALUE(count);
986 }
987
988 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
989 {
990 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
991
992 ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show");
993
994 if (!tz)
995 goto end;
996
997 if (!tz->flags.cooling_mode) {
998 seq_puts(seq, "<setting not supported>\n");
999 }
1000
1001 if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
1002 seq_printf(seq, "cooling mode: critical\n");
1003 else
1004 seq_printf(seq, "cooling mode: %s\n",
1005 tz->cooling_mode ? "passive" : "active");
1006
1007 end:
1008 return_VALUE(0);
1009 }
1010
1011 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1012 {
1013 return single_open(file, acpi_thermal_cooling_seq_show,
1014 PDE(inode)->data);
1015 }
1016
1017 static ssize_t
1018 acpi_thermal_write_cooling_mode(struct file *file,
1019 const char __user * buffer,
1020 size_t count, loff_t * ppos)
1021 {
1022 struct seq_file *m = (struct seq_file *)file->private_data;
1023 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1024 int result = 0;
1025 char mode_string[12] = { '\0' };
1026
1027 ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode");
1028
1029 if (!tz || (count > sizeof(mode_string) - 1))
1030 return_VALUE(-EINVAL);
1031
1032 if (!tz->flags.cooling_mode)
1033 return_VALUE(-ENODEV);
1034
1035 if (copy_from_user(mode_string, buffer, count))
1036 return_VALUE(-EFAULT);
1037
1038 mode_string[count] = '\0';
1039
1040 result = acpi_thermal_set_cooling_mode(tz,
1041 simple_strtoul(mode_string, NULL,
1042 0));
1043 if (result)
1044 return_VALUE(result);
1045
1046 acpi_thermal_check(tz);
1047
1048 return_VALUE(count);
1049 }
1050
1051 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1052 {
1053 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
1054
1055 ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show");
1056
1057 if (!tz)
1058 goto end;
1059
1060 if (!tz->polling_frequency) {
1061 seq_puts(seq, "<polling disabled>\n");
1062 goto end;
1063 }
1064
1065 seq_printf(seq, "polling frequency: %lu seconds\n",
1066 (tz->polling_frequency / 10));
1067
1068 end:
1069 return_VALUE(0);
1070 }
1071
1072 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1073 {
1074 return single_open(file, acpi_thermal_polling_seq_show,
1075 PDE(inode)->data);
1076 }
1077
1078 static ssize_t
1079 acpi_thermal_write_polling(struct file *file,
1080 const char __user * buffer,
1081 size_t count, loff_t * ppos)
1082 {
1083 struct seq_file *m = (struct seq_file *)file->private_data;
1084 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1085 int result = 0;
1086 char polling_string[12] = { '\0' };
1087 int seconds = 0;
1088
1089 ACPI_FUNCTION_TRACE("acpi_thermal_write_polling");
1090
1091 if (!tz || (count > sizeof(polling_string) - 1))
1092 return_VALUE(-EINVAL);
1093
1094 if (copy_from_user(polling_string, buffer, count))
1095 return_VALUE(-EFAULT);
1096
1097 polling_string[count] = '\0';
1098
1099 seconds = simple_strtoul(polling_string, NULL, 0);
1100
1101 result = acpi_thermal_set_polling(tz, seconds);
1102 if (result)
1103 return_VALUE(result);
1104
1105 acpi_thermal_check(tz);
1106
1107 return_VALUE(count);
1108 }
1109
1110 static int acpi_thermal_add_fs(struct acpi_device *device)
1111 {
1112 struct proc_dir_entry *entry = NULL;
1113
1114 ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
1115
1116 if (!acpi_device_dir(device)) {
1117 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1118 acpi_thermal_dir);
1119 if (!acpi_device_dir(device))
1120 return_VALUE(-ENODEV);
1121 acpi_device_dir(device)->owner = THIS_MODULE;
1122 }
1123
1124 /* 'state' [R] */
1125 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1126 S_IRUGO, acpi_device_dir(device));
1127 if (!entry)
1128 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1129 "Unable to create '%s' fs entry\n",
1130 ACPI_THERMAL_FILE_STATE));
1131 else {
1132 entry->proc_fops = &acpi_thermal_state_fops;
1133 entry->data = acpi_driver_data(device);
1134 entry->owner = THIS_MODULE;
1135 }
1136
1137 /* 'temperature' [R] */
1138 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1139 S_IRUGO, acpi_device_dir(device));
1140 if (!entry)
1141 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1142 "Unable to create '%s' fs entry\n",
1143 ACPI_THERMAL_FILE_TEMPERATURE));
1144 else {
1145 entry->proc_fops = &acpi_thermal_temp_fops;
1146 entry->data = acpi_driver_data(device);
1147 entry->owner = THIS_MODULE;
1148 }
1149
1150 /* 'trip_points' [R/W] */
1151 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1152 S_IFREG | S_IRUGO | S_IWUSR,
1153 acpi_device_dir(device));
1154 if (!entry)
1155 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1156 "Unable to create '%s' fs entry\n",
1157 ACPI_THERMAL_FILE_TRIP_POINTS));
1158 else {
1159 entry->proc_fops = &acpi_thermal_trip_fops;
1160 entry->data = acpi_driver_data(device);
1161 entry->owner = THIS_MODULE;
1162 }
1163
1164 /* 'cooling_mode' [R/W] */
1165 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1166 S_IFREG | S_IRUGO | S_IWUSR,
1167 acpi_device_dir(device));
1168 if (!entry)
1169 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1170 "Unable to create '%s' fs entry\n",
1171 ACPI_THERMAL_FILE_COOLING_MODE));
1172 else {
1173 entry->proc_fops = &acpi_thermal_cooling_fops;
1174 entry->data = acpi_driver_data(device);
1175 entry->owner = THIS_MODULE;
1176 }
1177
1178 /* 'polling_frequency' [R/W] */
1179 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1180 S_IFREG | S_IRUGO | S_IWUSR,
1181 acpi_device_dir(device));
1182 if (!entry)
1183 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1184 "Unable to create '%s' fs entry\n",
1185 ACPI_THERMAL_FILE_POLLING_FREQ));
1186 else {
1187 entry->proc_fops = &acpi_thermal_polling_fops;
1188 entry->data = acpi_driver_data(device);
1189 entry->owner = THIS_MODULE;
1190 }
1191
1192 return_VALUE(0);
1193 }
1194
1195 static int acpi_thermal_remove_fs(struct acpi_device *device)
1196 {
1197 ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
1198
1199 if (acpi_device_dir(device)) {
1200 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1201 acpi_device_dir(device));
1202 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1203 acpi_device_dir(device));
1204 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1205 acpi_device_dir(device));
1206 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1207 acpi_device_dir(device));
1208 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1209 acpi_device_dir(device));
1210 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1211 acpi_device_dir(device) = NULL;
1212 }
1213
1214 return_VALUE(0);
1215 }
1216
1217 /* --------------------------------------------------------------------------
1218 Driver Interface
1219 -------------------------------------------------------------------------- */
1220
1221 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1222 {
1223 struct acpi_thermal *tz = (struct acpi_thermal *)data;
1224 struct acpi_device *device = NULL;
1225
1226 ACPI_FUNCTION_TRACE("acpi_thermal_notify");
1227
1228 if (!tz)
1229 return_VOID;
1230
1231 if (acpi_bus_get_device(tz->handle, &device))
1232 return_VOID;
1233
1234 switch (event) {
1235 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1236 acpi_thermal_check(tz);
1237 break;
1238 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1239 acpi_thermal_get_trip_points(tz);
1240 acpi_thermal_check(tz);
1241 acpi_bus_generate_event(device, event, 0);
1242 break;
1243 case ACPI_THERMAL_NOTIFY_DEVICES:
1244 if (tz->flags.devices)
1245 acpi_thermal_get_devices(tz);
1246 acpi_bus_generate_event(device, event, 0);
1247 break;
1248 default:
1249 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1250 "Unsupported event [0x%x]\n", event));
1251 break;
1252 }
1253
1254 return_VOID;
1255 }
1256
1257 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1258 {
1259 int result = 0;
1260
1261 ACPI_FUNCTION_TRACE("acpi_thermal_get_info");
1262
1263 if (!tz)
1264 return_VALUE(-EINVAL);
1265
1266 /* Get temperature [_TMP] (required) */
1267 result = acpi_thermal_get_temperature(tz);
1268 if (result)
1269 return_VALUE(result);
1270
1271 /* Get trip points [_CRT, _PSV, etc.] (required) */
1272 result = acpi_thermal_get_trip_points(tz);
1273 if (result)
1274 return_VALUE(result);
1275
1276 /* Set the cooling mode [_SCP] to active cooling (default) */
1277 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1278 if (!result)
1279 tz->flags.cooling_mode = 1;
1280 else {
1281 /* Oh,we have not _SCP method.
1282 Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1283 tz->flags.cooling_mode = 0;
1284 if (tz->trips.active[0].flags.valid
1285 && tz->trips.passive.flags.valid) {
1286 if (tz->trips.passive.temperature >
1287 tz->trips.active[0].temperature)
1288 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1289 else
1290 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1291 } else if (!tz->trips.active[0].flags.valid
1292 && tz->trips.passive.flags.valid) {
1293 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1294 } else if (tz->trips.active[0].flags.valid
1295 && !tz->trips.passive.flags.valid) {
1296 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1297 } else {
1298 /* _ACx and _PSV are optional, but _CRT is required */
1299 tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1300 }
1301 }
1302
1303 /* Get default polling frequency [_TZP] (optional) */
1304 if (tzp)
1305 tz->polling_frequency = tzp;
1306 else
1307 acpi_thermal_get_polling_frequency(tz);
1308
1309 /* Get devices in this thermal zone [_TZD] (optional) */
1310 result = acpi_thermal_get_devices(tz);
1311 if (!result)
1312 tz->flags.devices = 1;
1313
1314 return_VALUE(0);
1315 }
1316
1317 static int acpi_thermal_add(struct acpi_device *device)
1318 {
1319 int result = 0;
1320 acpi_status status = AE_OK;
1321 struct acpi_thermal *tz = NULL;
1322
1323 ACPI_FUNCTION_TRACE("acpi_thermal_add");
1324
1325 if (!device)
1326 return_VALUE(-EINVAL);
1327
1328 tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1329 if (!tz)
1330 return_VALUE(-ENOMEM);
1331 memset(tz, 0, sizeof(struct acpi_thermal));
1332
1333 tz->handle = device->handle;
1334 strcpy(tz->name, device->pnp.bus_id);
1335 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1336 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1337 acpi_driver_data(device) = tz;
1338
1339 result = acpi_thermal_get_info(tz);
1340 if (result)
1341 goto end;
1342
1343 result = acpi_thermal_add_fs(device);
1344 if (result)
1345 return_VALUE(result);
1346
1347 init_timer(&tz->timer);
1348
1349 acpi_thermal_check(tz);
1350
1351 status = acpi_install_notify_handler(tz->handle,
1352 ACPI_DEVICE_NOTIFY,
1353 acpi_thermal_notify, tz);
1354 if (ACPI_FAILURE(status)) {
1355 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1356 "Error installing notify handler\n"));
1357 result = -ENODEV;
1358 goto end;
1359 }
1360
1361 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1362 acpi_device_name(device), acpi_device_bid(device),
1363 KELVIN_TO_CELSIUS(tz->temperature));
1364
1365 end:
1366 if (result) {
1367 acpi_thermal_remove_fs(device);
1368 kfree(tz);
1369 }
1370
1371 return_VALUE(result);
1372 }
1373
1374 static int acpi_thermal_remove(struct acpi_device *device, int type)
1375 {
1376 acpi_status status = AE_OK;
1377 struct acpi_thermal *tz = NULL;
1378
1379 ACPI_FUNCTION_TRACE("acpi_thermal_remove");
1380
1381 if (!device || !acpi_driver_data(device))
1382 return_VALUE(-EINVAL);
1383
1384 tz = (struct acpi_thermal *)acpi_driver_data(device);
1385
1386 /* avoid timer adding new defer task */
1387 tz->zombie = 1;
1388 /* wait for running timer (on other CPUs) finish */
1389 del_timer_sync(&(tz->timer));
1390 /* synchronize deferred task */
1391 acpi_os_wait_events_complete(NULL);
1392 /* deferred task may reinsert timer */
1393 del_timer_sync(&(tz->timer));
1394
1395 status = acpi_remove_notify_handler(tz->handle,
1396 ACPI_DEVICE_NOTIFY,
1397 acpi_thermal_notify);
1398 if (ACPI_FAILURE(status))
1399 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1400 "Error removing notify handler\n"));
1401
1402 /* Terminate policy */
1403 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1404 tz->trips.passive.flags.enabled = 0;
1405 acpi_thermal_passive(tz);
1406 }
1407 if (tz->trips.active[0].flags.valid
1408 && tz->trips.active[0].flags.enabled) {
1409 tz->trips.active[0].flags.enabled = 0;
1410 acpi_thermal_active(tz);
1411 }
1412
1413 acpi_thermal_remove_fs(device);
1414
1415 kfree(tz);
1416 return_VALUE(0);
1417 }
1418
1419 static int __init acpi_thermal_init(void)
1420 {
1421 int result = 0;
1422
1423 ACPI_FUNCTION_TRACE("acpi_thermal_init");
1424
1425 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1426 if (!acpi_thermal_dir)
1427 return_VALUE(-ENODEV);
1428 acpi_thermal_dir->owner = THIS_MODULE;
1429
1430 result = acpi_bus_register_driver(&acpi_thermal_driver);
1431 if (result < 0) {
1432 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1433 return_VALUE(-ENODEV);
1434 }
1435
1436 return_VALUE(0);
1437 }
1438
1439 static void __exit acpi_thermal_exit(void)
1440 {
1441 ACPI_FUNCTION_TRACE("acpi_thermal_exit");
1442
1443 acpi_bus_unregister_driver(&acpi_thermal_driver);
1444
1445 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1446
1447 return_VOID;
1448 }
1449
1450 module_init(acpi_thermal_init);
1451 module_exit(acpi_thermal_exit);
Support for the Chinese Samsung S3C2440 based development boards