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ACPI: un-export ACPI_ERROR() -- use printk(KERN_ERR...)
[GitHub/mt8127/android_kernel_alcatel_ttab.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_EXCEPTION((AE_INFO, status, "No critical threshold"));
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 printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
388 else
389 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
390 "Found passive threshold [%lu]\n",
391 tz->trips.passive.temperature));
392 }
393
394 /* Active: Fans, etc. (optional) */
395
396 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
397
398 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
399
400 status =
401 acpi_evaluate_integer(tz->handle, name, NULL,
402 &tz->trips.active[i].temperature);
403 if (ACPI_FAILURE(status))
404 break;
405
406 name[2] = 'L';
407 status =
408 acpi_evaluate_reference(tz->handle, name, NULL,
409 &tz->trips.active[i].devices);
410 if (ACPI_SUCCESS(status)) {
411 tz->trips.active[i].flags.valid = 1;
412 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
413 "Found active threshold [%d]:[%lu]\n",
414 i, tz->trips.active[i].temperature));
415 } else
416 ACPI_EXCEPTION((AE_INFO, status,
417 "Invalid active threshold [%d]", 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 printk(KERN_WARNING PREFIX "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 printk(KERN_WARNING PREFIX "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 printk(KERN_WARNING PREFIX
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 printk(KERN_WARNING PREFIX
669 "Unable to turn cooling device [%p] 'off'\n",
670 active->devices.handles[j]);
671 continue;
672 }
673 active->flags.enabled = 0;
674 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
675 "Cooling device [%p] now 'off'\n",
676 active->devices.handles[j]));
677 }
678 }
679 }
680
681 static void acpi_thermal_check(void *context);
682
683 static void acpi_thermal_run(unsigned long data)
684 {
685 struct acpi_thermal *tz = (struct acpi_thermal *)data;
686 if (!tz->zombie)
687 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
688 }
689
690 static void acpi_thermal_check(void *data)
691 {
692 int result = 0;
693 struct acpi_thermal *tz = (struct acpi_thermal *)data;
694 unsigned long sleep_time = 0;
695 int i = 0;
696 struct acpi_thermal_state state;
697
698 ACPI_FUNCTION_TRACE("acpi_thermal_check");
699
700 if (!tz) {
701 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
702 return_VOID;
703 }
704
705 state = tz->state;
706
707 result = acpi_thermal_get_temperature(tz);
708 if (result)
709 return_VOID;
710
711 memset(&tz->state, 0, sizeof(tz->state));
712
713 /*
714 * Check Trip Points
715 * -----------------
716 * Compare the current temperature to the trip point values to see
717 * if we've entered one of the thermal policy states. Note that
718 * this function determines when a state is entered, but the
719 * individual policy decides when it is exited (e.g. hysteresis).
720 */
721 if (tz->trips.critical.flags.valid)
722 state.critical |=
723 (tz->temperature >= tz->trips.critical.temperature);
724 if (tz->trips.hot.flags.valid)
725 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
726 if (tz->trips.passive.flags.valid)
727 state.passive |=
728 (tz->temperature >= tz->trips.passive.temperature);
729 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
730 if (tz->trips.active[i].flags.valid)
731 state.active |=
732 (tz->temperature >=
733 tz->trips.active[i].temperature);
734
735 /*
736 * Invoke Policy
737 * -------------
738 * Separated from the above check to allow individual policy to
739 * determine when to exit a given state.
740 */
741 if (state.critical)
742 acpi_thermal_critical(tz);
743 if (state.hot)
744 acpi_thermal_hot(tz);
745 if (state.passive)
746 acpi_thermal_passive(tz);
747 if (state.active)
748 acpi_thermal_active(tz);
749
750 /*
751 * Calculate State
752 * ---------------
753 * Again, separated from the above two to allow independent policy
754 * decisions.
755 */
756 tz->state.critical = tz->trips.critical.flags.enabled;
757 tz->state.hot = tz->trips.hot.flags.enabled;
758 tz->state.passive = tz->trips.passive.flags.enabled;
759 tz->state.active = 0;
760 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
761 tz->state.active |= tz->trips.active[i].flags.enabled;
762
763 /*
764 * Calculate Sleep Time
765 * --------------------
766 * If we're in the passive state, use _TSP's value. Otherwise
767 * use the default polling frequency (e.g. _TZP). If no polling
768 * frequency is specified then we'll wait forever (at least until
769 * a thermal event occurs). Note that _TSP and _TZD values are
770 * given in 1/10th seconds (we must covert to milliseconds).
771 */
772 if (tz->state.passive)
773 sleep_time = tz->trips.passive.tsp * 100;
774 else if (tz->polling_frequency > 0)
775 sleep_time = tz->polling_frequency * 100;
776
777 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
778 tz->name, tz->temperature, sleep_time));
779
780 /*
781 * Schedule Next Poll
782 * ------------------
783 */
784 if (!sleep_time) {
785 if (timer_pending(&(tz->timer)))
786 del_timer(&(tz->timer));
787 } else {
788 if (timer_pending(&(tz->timer)))
789 mod_timer(&(tz->timer), (HZ * sleep_time) / 1000);
790 else {
791 tz->timer.data = (unsigned long)tz;
792 tz->timer.function = acpi_thermal_run;
793 tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
794 add_timer(&(tz->timer));
795 }
796 }
797
798 return_VOID;
799 }
800
801 /* --------------------------------------------------------------------------
802 FS Interface (/proc)
803 -------------------------------------------------------------------------- */
804
805 static struct proc_dir_entry *acpi_thermal_dir;
806
807 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
808 {
809 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
810
811 ACPI_FUNCTION_TRACE("acpi_thermal_state_seq_show");
812
813 if (!tz)
814 goto end;
815
816 seq_puts(seq, "state: ");
817
818 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
819 && !tz->state.active)
820 seq_puts(seq, "ok\n");
821 else {
822 if (tz->state.critical)
823 seq_puts(seq, "critical ");
824 if (tz->state.hot)
825 seq_puts(seq, "hot ");
826 if (tz->state.passive)
827 seq_puts(seq, "passive ");
828 if (tz->state.active)
829 seq_printf(seq, "active[%d]", tz->state.active_index);
830 seq_puts(seq, "\n");
831 }
832
833 end:
834 return_VALUE(0);
835 }
836
837 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
838 {
839 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
840 }
841
842 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
843 {
844 int result = 0;
845 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
846
847 ACPI_FUNCTION_TRACE("acpi_thermal_temp_seq_show");
848
849 if (!tz)
850 goto end;
851
852 result = acpi_thermal_get_temperature(tz);
853 if (result)
854 goto end;
855
856 seq_printf(seq, "temperature: %ld C\n",
857 KELVIN_TO_CELSIUS(tz->temperature));
858
859 end:
860 return_VALUE(0);
861 }
862
863 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
864 {
865 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
866 }
867
868 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
869 {
870 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
871 int i = 0;
872 int j = 0;
873
874 ACPI_FUNCTION_TRACE("acpi_thermal_trip_seq_show");
875
876 if (!tz)
877 goto end;
878
879 if (tz->trips.critical.flags.valid)
880 seq_printf(seq, "critical (S5): %ld C\n",
881 KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
882
883 if (tz->trips.hot.flags.valid)
884 seq_printf(seq, "hot (S4): %ld C\n",
885 KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
886
887 if (tz->trips.passive.flags.valid) {
888 seq_printf(seq,
889 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
890 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
891 tz->trips.passive.tc1, tz->trips.passive.tc2,
892 tz->trips.passive.tsp);
893 for (j = 0; j < tz->trips.passive.devices.count; j++) {
894
895 seq_printf(seq, "0x%p ",
896 tz->trips.passive.devices.handles[j]);
897 }
898 seq_puts(seq, "\n");
899 }
900
901 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
902 if (!(tz->trips.active[i].flags.valid))
903 break;
904 seq_printf(seq, "active[%d]: %ld C: devices=",
905 i,
906 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
907 for (j = 0; j < tz->trips.active[i].devices.count; j++)
908 seq_printf(seq, "0x%p ",
909 tz->trips.active[i].devices.handles[j]);
910 seq_puts(seq, "\n");
911 }
912
913 end:
914 return_VALUE(0);
915 }
916
917 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
918 {
919 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
920 }
921
922 static ssize_t
923 acpi_thermal_write_trip_points(struct file *file,
924 const char __user * buffer,
925 size_t count, loff_t * ppos)
926 {
927 struct seq_file *m = (struct seq_file *)file->private_data;
928 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
929
930 char *limit_string;
931 int num, critical, hot, passive;
932 int *active;
933 int i = 0;
934
935 ACPI_FUNCTION_TRACE("acpi_thermal_write_trip_points");
936
937 limit_string = kmalloc(ACPI_THERMAL_MAX_LIMIT_STR_LEN, GFP_KERNEL);
938 if (!limit_string)
939 return_VALUE(-ENOMEM);
940
941 memset(limit_string, 0, ACPI_THERMAL_MAX_LIMIT_STR_LEN);
942
943 active = kmalloc(ACPI_THERMAL_MAX_ACTIVE * sizeof(int), GFP_KERNEL);
944 if (!active) {
945 kfree(limit_string);
946 return_VALUE(-ENOMEM);
947 }
948
949 if (!tz || (count > ACPI_THERMAL_MAX_LIMIT_STR_LEN - 1)) {
950 count = -EINVAL;
951 goto end;
952 }
953
954 if (copy_from_user(limit_string, buffer, count)) {
955 count = -EFAULT;
956 goto end;
957 }
958
959 limit_string[count] = '\0';
960
961 num = sscanf(limit_string, "%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d:%d",
962 &critical, &hot, &passive,
963 &active[0], &active[1], &active[2], &active[3], &active[4],
964 &active[5], &active[6], &active[7], &active[8],
965 &active[9]);
966 if (!(num >= 5 && num < (ACPI_THERMAL_MAX_ACTIVE + 3))) {
967 count = -EINVAL;
968 goto end;
969 }
970
971 tz->trips.critical.temperature = CELSIUS_TO_KELVIN(critical);
972 tz->trips.hot.temperature = CELSIUS_TO_KELVIN(hot);
973 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(passive);
974 for (i = 0; i < num - 3; i++) {
975 if (!(tz->trips.active[i].flags.valid))
976 break;
977 tz->trips.active[i].temperature = CELSIUS_TO_KELVIN(active[i]);
978 }
979
980 end:
981 kfree(active);
982 kfree(limit_string);
983 return_VALUE(count);
984 }
985
986 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
987 {
988 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
989
990 ACPI_FUNCTION_TRACE("acpi_thermal_cooling_seq_show");
991
992 if (!tz)
993 goto end;
994
995 if (!tz->flags.cooling_mode) {
996 seq_puts(seq, "<setting not supported>\n");
997 }
998
999 if (tz->cooling_mode == ACPI_THERMAL_MODE_CRITICAL)
1000 seq_printf(seq, "cooling mode: critical\n");
1001 else
1002 seq_printf(seq, "cooling mode: %s\n",
1003 tz->cooling_mode ? "passive" : "active");
1004
1005 end:
1006 return_VALUE(0);
1007 }
1008
1009 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1010 {
1011 return single_open(file, acpi_thermal_cooling_seq_show,
1012 PDE(inode)->data);
1013 }
1014
1015 static ssize_t
1016 acpi_thermal_write_cooling_mode(struct file *file,
1017 const char __user * buffer,
1018 size_t count, loff_t * ppos)
1019 {
1020 struct seq_file *m = (struct seq_file *)file->private_data;
1021 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1022 int result = 0;
1023 char mode_string[12] = { '\0' };
1024
1025 ACPI_FUNCTION_TRACE("acpi_thermal_write_cooling_mode");
1026
1027 if (!tz || (count > sizeof(mode_string) - 1))
1028 return_VALUE(-EINVAL);
1029
1030 if (!tz->flags.cooling_mode)
1031 return_VALUE(-ENODEV);
1032
1033 if (copy_from_user(mode_string, buffer, count))
1034 return_VALUE(-EFAULT);
1035
1036 mode_string[count] = '\0';
1037
1038 result = acpi_thermal_set_cooling_mode(tz,
1039 simple_strtoul(mode_string, NULL,
1040 0));
1041 if (result)
1042 return_VALUE(result);
1043
1044 acpi_thermal_check(tz);
1045
1046 return_VALUE(count);
1047 }
1048
1049 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1050 {
1051 struct acpi_thermal *tz = (struct acpi_thermal *)seq->private;
1052
1053 ACPI_FUNCTION_TRACE("acpi_thermal_polling_seq_show");
1054
1055 if (!tz)
1056 goto end;
1057
1058 if (!tz->polling_frequency) {
1059 seq_puts(seq, "<polling disabled>\n");
1060 goto end;
1061 }
1062
1063 seq_printf(seq, "polling frequency: %lu seconds\n",
1064 (tz->polling_frequency / 10));
1065
1066 end:
1067 return_VALUE(0);
1068 }
1069
1070 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1071 {
1072 return single_open(file, acpi_thermal_polling_seq_show,
1073 PDE(inode)->data);
1074 }
1075
1076 static ssize_t
1077 acpi_thermal_write_polling(struct file *file,
1078 const char __user * buffer,
1079 size_t count, loff_t * ppos)
1080 {
1081 struct seq_file *m = (struct seq_file *)file->private_data;
1082 struct acpi_thermal *tz = (struct acpi_thermal *)m->private;
1083 int result = 0;
1084 char polling_string[12] = { '\0' };
1085 int seconds = 0;
1086
1087 ACPI_FUNCTION_TRACE("acpi_thermal_write_polling");
1088
1089 if (!tz || (count > sizeof(polling_string) - 1))
1090 return_VALUE(-EINVAL);
1091
1092 if (copy_from_user(polling_string, buffer, count))
1093 return_VALUE(-EFAULT);
1094
1095 polling_string[count] = '\0';
1096
1097 seconds = simple_strtoul(polling_string, NULL, 0);
1098
1099 result = acpi_thermal_set_polling(tz, seconds);
1100 if (result)
1101 return_VALUE(result);
1102
1103 acpi_thermal_check(tz);
1104
1105 return_VALUE(count);
1106 }
1107
1108 static int acpi_thermal_add_fs(struct acpi_device *device)
1109 {
1110 struct proc_dir_entry *entry = NULL;
1111
1112 ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
1113
1114 if (!acpi_device_dir(device)) {
1115 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1116 acpi_thermal_dir);
1117 if (!acpi_device_dir(device))
1118 return_VALUE(-ENODEV);
1119 acpi_device_dir(device)->owner = THIS_MODULE;
1120 }
1121
1122 /* 'state' [R] */
1123 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1124 S_IRUGO, acpi_device_dir(device));
1125 if (!entry)
1126 return_VALUE(-ENODEV);
1127 else {
1128 entry->proc_fops = &acpi_thermal_state_fops;
1129 entry->data = acpi_driver_data(device);
1130 entry->owner = THIS_MODULE;
1131 }
1132
1133 /* 'temperature' [R] */
1134 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1135 S_IRUGO, acpi_device_dir(device));
1136 if (!entry)
1137 return_VALUE(-ENODEV);
1138 else {
1139 entry->proc_fops = &acpi_thermal_temp_fops;
1140 entry->data = acpi_driver_data(device);
1141 entry->owner = THIS_MODULE;
1142 }
1143
1144 /* 'trip_points' [R/W] */
1145 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1146 S_IFREG | S_IRUGO | S_IWUSR,
1147 acpi_device_dir(device));
1148 if (!entry)
1149 return_VALUE(-ENODEV);
1150 else {
1151 entry->proc_fops = &acpi_thermal_trip_fops;
1152 entry->data = acpi_driver_data(device);
1153 entry->owner = THIS_MODULE;
1154 }
1155
1156 /* 'cooling_mode' [R/W] */
1157 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1158 S_IFREG | S_IRUGO | S_IWUSR,
1159 acpi_device_dir(device));
1160 if (!entry)
1161 return_VALUE(-ENODEV);
1162 else {
1163 entry->proc_fops = &acpi_thermal_cooling_fops;
1164 entry->data = acpi_driver_data(device);
1165 entry->owner = THIS_MODULE;
1166 }
1167
1168 /* 'polling_frequency' [R/W] */
1169 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1170 S_IFREG | S_IRUGO | S_IWUSR,
1171 acpi_device_dir(device));
1172 if (!entry)
1173 return_VALUE(-ENODEV);
1174 else {
1175 entry->proc_fops = &acpi_thermal_polling_fops;
1176 entry->data = acpi_driver_data(device);
1177 entry->owner = THIS_MODULE;
1178 }
1179
1180 return_VALUE(0);
1181 }
1182
1183 static int acpi_thermal_remove_fs(struct acpi_device *device)
1184 {
1185 ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
1186
1187 if (acpi_device_dir(device)) {
1188 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1189 acpi_device_dir(device));
1190 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1191 acpi_device_dir(device));
1192 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1193 acpi_device_dir(device));
1194 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1195 acpi_device_dir(device));
1196 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1197 acpi_device_dir(device));
1198 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1199 acpi_device_dir(device) = NULL;
1200 }
1201
1202 return_VALUE(0);
1203 }
1204
1205 /* --------------------------------------------------------------------------
1206 Driver Interface
1207 -------------------------------------------------------------------------- */
1208
1209 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1210 {
1211 struct acpi_thermal *tz = (struct acpi_thermal *)data;
1212 struct acpi_device *device = NULL;
1213
1214 ACPI_FUNCTION_TRACE("acpi_thermal_notify");
1215
1216 if (!tz)
1217 return_VOID;
1218
1219 if (acpi_bus_get_device(tz->handle, &device))
1220 return_VOID;
1221
1222 switch (event) {
1223 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1224 acpi_thermal_check(tz);
1225 break;
1226 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1227 acpi_thermal_get_trip_points(tz);
1228 acpi_thermal_check(tz);
1229 acpi_bus_generate_event(device, event, 0);
1230 break;
1231 case ACPI_THERMAL_NOTIFY_DEVICES:
1232 if (tz->flags.devices)
1233 acpi_thermal_get_devices(tz);
1234 acpi_bus_generate_event(device, event, 0);
1235 break;
1236 default:
1237 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1238 "Unsupported event [0x%x]\n", event));
1239 break;
1240 }
1241
1242 return_VOID;
1243 }
1244
1245 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1246 {
1247 int result = 0;
1248
1249 ACPI_FUNCTION_TRACE("acpi_thermal_get_info");
1250
1251 if (!tz)
1252 return_VALUE(-EINVAL);
1253
1254 /* Get temperature [_TMP] (required) */
1255 result = acpi_thermal_get_temperature(tz);
1256 if (result)
1257 return_VALUE(result);
1258
1259 /* Get trip points [_CRT, _PSV, etc.] (required) */
1260 result = acpi_thermal_get_trip_points(tz);
1261 if (result)
1262 return_VALUE(result);
1263
1264 /* Set the cooling mode [_SCP] to active cooling (default) */
1265 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1266 if (!result)
1267 tz->flags.cooling_mode = 1;
1268 else {
1269 /* Oh,we have not _SCP method.
1270 Generally show cooling_mode by _ACx, _PSV,spec 12.2 */
1271 tz->flags.cooling_mode = 0;
1272 if (tz->trips.active[0].flags.valid
1273 && tz->trips.passive.flags.valid) {
1274 if (tz->trips.passive.temperature >
1275 tz->trips.active[0].temperature)
1276 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1277 else
1278 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1279 } else if (!tz->trips.active[0].flags.valid
1280 && tz->trips.passive.flags.valid) {
1281 tz->cooling_mode = ACPI_THERMAL_MODE_PASSIVE;
1282 } else if (tz->trips.active[0].flags.valid
1283 && !tz->trips.passive.flags.valid) {
1284 tz->cooling_mode = ACPI_THERMAL_MODE_ACTIVE;
1285 } else {
1286 /* _ACx and _PSV are optional, but _CRT is required */
1287 tz->cooling_mode = ACPI_THERMAL_MODE_CRITICAL;
1288 }
1289 }
1290
1291 /* Get default polling frequency [_TZP] (optional) */
1292 if (tzp)
1293 tz->polling_frequency = tzp;
1294 else
1295 acpi_thermal_get_polling_frequency(tz);
1296
1297 /* Get devices in this thermal zone [_TZD] (optional) */
1298 result = acpi_thermal_get_devices(tz);
1299 if (!result)
1300 tz->flags.devices = 1;
1301
1302 return_VALUE(0);
1303 }
1304
1305 static int acpi_thermal_add(struct acpi_device *device)
1306 {
1307 int result = 0;
1308 acpi_status status = AE_OK;
1309 struct acpi_thermal *tz = NULL;
1310
1311 ACPI_FUNCTION_TRACE("acpi_thermal_add");
1312
1313 if (!device)
1314 return_VALUE(-EINVAL);
1315
1316 tz = kmalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1317 if (!tz)
1318 return_VALUE(-ENOMEM);
1319 memset(tz, 0, sizeof(struct acpi_thermal));
1320
1321 tz->handle = device->handle;
1322 strcpy(tz->name, device->pnp.bus_id);
1323 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1324 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1325 acpi_driver_data(device) = tz;
1326
1327 result = acpi_thermal_get_info(tz);
1328 if (result)
1329 goto end;
1330
1331 result = acpi_thermal_add_fs(device);
1332 if (result)
1333 goto end;
1334
1335 init_timer(&tz->timer);
1336
1337 acpi_thermal_check(tz);
1338
1339 status = acpi_install_notify_handler(tz->handle,
1340 ACPI_DEVICE_NOTIFY,
1341 acpi_thermal_notify, tz);
1342 if (ACPI_FAILURE(status)) {
1343 result = -ENODEV;
1344 goto end;
1345 }
1346
1347 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1348 acpi_device_name(device), acpi_device_bid(device),
1349 KELVIN_TO_CELSIUS(tz->temperature));
1350
1351 end:
1352 if (result) {
1353 acpi_thermal_remove_fs(device);
1354 kfree(tz);
1355 }
1356
1357 return_VALUE(result);
1358 }
1359
1360 static int acpi_thermal_remove(struct acpi_device *device, int type)
1361 {
1362 acpi_status status = AE_OK;
1363 struct acpi_thermal *tz = NULL;
1364
1365 ACPI_FUNCTION_TRACE("acpi_thermal_remove");
1366
1367 if (!device || !acpi_driver_data(device))
1368 return_VALUE(-EINVAL);
1369
1370 tz = (struct acpi_thermal *)acpi_driver_data(device);
1371
1372 /* avoid timer adding new defer task */
1373 tz->zombie = 1;
1374 /* wait for running timer (on other CPUs) finish */
1375 del_timer_sync(&(tz->timer));
1376 /* synchronize deferred task */
1377 acpi_os_wait_events_complete(NULL);
1378 /* deferred task may reinsert timer */
1379 del_timer_sync(&(tz->timer));
1380
1381 status = acpi_remove_notify_handler(tz->handle,
1382 ACPI_DEVICE_NOTIFY,
1383 acpi_thermal_notify);
1384
1385 /* Terminate policy */
1386 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1387 tz->trips.passive.flags.enabled = 0;
1388 acpi_thermal_passive(tz);
1389 }
1390 if (tz->trips.active[0].flags.valid
1391 && tz->trips.active[0].flags.enabled) {
1392 tz->trips.active[0].flags.enabled = 0;
1393 acpi_thermal_active(tz);
1394 }
1395
1396 acpi_thermal_remove_fs(device);
1397
1398 kfree(tz);
1399 return_VALUE(0);
1400 }
1401
1402 static int acpi_thermal_resume(struct acpi_device *device, int state)
1403 {
1404 struct acpi_thermal *tz = NULL;
1405
1406 if (!device || !acpi_driver_data(device))
1407 return_VALUE(-EINVAL);
1408
1409 tz = (struct acpi_thermal *)acpi_driver_data(device);
1410
1411 acpi_thermal_check(tz);
1412
1413 return AE_OK;
1414 }
1415
1416 static int __init acpi_thermal_init(void)
1417 {
1418 int result = 0;
1419
1420 ACPI_FUNCTION_TRACE("acpi_thermal_init");
1421
1422 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1423 if (!acpi_thermal_dir)
1424 return_VALUE(-ENODEV);
1425 acpi_thermal_dir->owner = THIS_MODULE;
1426
1427 result = acpi_bus_register_driver(&acpi_thermal_driver);
1428 if (result < 0) {
1429 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1430 return_VALUE(-ENODEV);
1431 }
1432
1433 return_VALUE(0);
1434 }
1435
1436 static void __exit acpi_thermal_exit(void)
1437 {
1438 ACPI_FUNCTION_TRACE("acpi_thermal_exit");
1439
1440 acpi_bus_unregister_driver(&acpi_thermal_driver);
1441
1442 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1443
1444 return_VOID;
1445 }
1446
1447 module_init(acpi_thermal_init);
1448 module_exit(acpi_thermal_exit);
kernel source for telekom puls (alcatel/mediatek)