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[deliverable/linux.git] / drivers / acpi / thermal.c
1 /*
2 * acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 *
25 * This driver fully implements the ACPI thermal policy as described in the
26 * ACPI 2.0 Specification.
27 *
28 * TBD: 1. Implement passive cooling hysteresis.
29 * 2. Enhance passive cooling (CPU) states/limit interface to support
30 * concepts of 'multiple limiters', upper/lower limits, etc.
31 *
32 */
33
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/dmi.h>
37 #include <linux/init.h>
38 #include <linux/types.h>
39 #include <linux/proc_fs.h>
40 #include <linux/timer.h>
41 #include <linux/jiffies.h>
42 #include <linux/kmod.h>
43 #include <linux/seq_file.h>
44 #include <linux/reboot.h>
45 #include <asm/uaccess.h>
46 #include <linux/thermal.h>
47 #include <acpi/acpi_bus.h>
48 #include <acpi/acpi_drivers.h>
49
50 #define ACPI_THERMAL_COMPONENT 0x04000000
51 #define ACPI_THERMAL_CLASS "thermal_zone"
52 #define ACPI_THERMAL_DEVICE_NAME "Thermal Zone"
53 #define ACPI_THERMAL_FILE_STATE "state"
54 #define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
55 #define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
56 #define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
57 #define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
58 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
59 #define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
60 #define ACPI_THERMAL_NOTIFY_DEVICES 0x82
61 #define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
62 #define ACPI_THERMAL_NOTIFY_HOT 0xF1
63 #define ACPI_THERMAL_MODE_ACTIVE 0x00
64
65 #define ACPI_THERMAL_MAX_ACTIVE 10
66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
67
68 #define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
69 #define CELSIUS_TO_KELVIN(t) ((t+273)*10)
70
71 #define _COMPONENT ACPI_THERMAL_COMPONENT
72 ACPI_MODULE_NAME("thermal");
73
74 MODULE_AUTHOR("Paul Diefenbaugh");
75 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
76 MODULE_LICENSE("GPL");
77
78 static int act;
79 module_param(act, int, 0644);
80 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
81
82 static int crt;
83 module_param(crt, int, 0644);
84 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
85
86 static int tzp;
87 module_param(tzp, int, 0444);
88 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
89
90 static int nocrt;
91 module_param(nocrt, int, 0);
92 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
93
94 static int off;
95 module_param(off, int, 0);
96 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
97
98 static int psv;
99 module_param(psv, int, 0644);
100 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
101
102 static int acpi_thermal_add(struct acpi_device *device);
103 static int acpi_thermal_remove(struct acpi_device *device, int type);
104 static int acpi_thermal_resume(struct acpi_device *device);
105 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
106 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
107 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
108 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
109 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
110 const char __user *, size_t,
111 loff_t *);
112 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
113 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
114 size_t, loff_t *);
115
116 static const struct acpi_device_id thermal_device_ids[] = {
117 {ACPI_THERMAL_HID, 0},
118 {"", 0},
119 };
120 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
121
122 static struct acpi_driver acpi_thermal_driver = {
123 .name = "thermal",
124 .class = ACPI_THERMAL_CLASS,
125 .ids = thermal_device_ids,
126 .ops = {
127 .add = acpi_thermal_add,
128 .remove = acpi_thermal_remove,
129 .resume = acpi_thermal_resume,
130 },
131 };
132
133 struct acpi_thermal_state {
134 u8 critical:1;
135 u8 hot:1;
136 u8 passive:1;
137 u8 active:1;
138 u8 reserved:4;
139 int active_index;
140 };
141
142 struct acpi_thermal_state_flags {
143 u8 valid:1;
144 u8 enabled:1;
145 u8 reserved:6;
146 };
147
148 struct acpi_thermal_critical {
149 struct acpi_thermal_state_flags flags;
150 unsigned long temperature;
151 };
152
153 struct acpi_thermal_hot {
154 struct acpi_thermal_state_flags flags;
155 unsigned long temperature;
156 };
157
158 struct acpi_thermal_passive {
159 struct acpi_thermal_state_flags flags;
160 unsigned long temperature;
161 unsigned long tc1;
162 unsigned long tc2;
163 unsigned long tsp;
164 struct acpi_handle_list devices;
165 };
166
167 struct acpi_thermal_active {
168 struct acpi_thermal_state_flags flags;
169 unsigned long temperature;
170 struct acpi_handle_list devices;
171 };
172
173 struct acpi_thermal_trips {
174 struct acpi_thermal_critical critical;
175 struct acpi_thermal_hot hot;
176 struct acpi_thermal_passive passive;
177 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
178 };
179
180 struct acpi_thermal_flags {
181 u8 cooling_mode:1; /* _SCP */
182 u8 devices:1; /* _TZD */
183 u8 reserved:6;
184 };
185
186 struct acpi_thermal {
187 struct acpi_device * device;
188 acpi_bus_id name;
189 unsigned long temperature;
190 unsigned long last_temperature;
191 unsigned long polling_frequency;
192 volatile u8 zombie;
193 struct acpi_thermal_flags flags;
194 struct acpi_thermal_state state;
195 struct acpi_thermal_trips trips;
196 struct acpi_handle_list devices;
197 struct timer_list timer;
198 struct thermal_zone_device *thermal_zone;
199 int tz_enabled;
200 struct mutex lock;
201 };
202
203 static const struct file_operations acpi_thermal_state_fops = {
204 .open = acpi_thermal_state_open_fs,
205 .read = seq_read,
206 .llseek = seq_lseek,
207 .release = single_release,
208 };
209
210 static const struct file_operations acpi_thermal_temp_fops = {
211 .open = acpi_thermal_temp_open_fs,
212 .read = seq_read,
213 .llseek = seq_lseek,
214 .release = single_release,
215 };
216
217 static const struct file_operations acpi_thermal_trip_fops = {
218 .open = acpi_thermal_trip_open_fs,
219 .read = seq_read,
220 .llseek = seq_lseek,
221 .release = single_release,
222 };
223
224 static const struct file_operations acpi_thermal_cooling_fops = {
225 .open = acpi_thermal_cooling_open_fs,
226 .read = seq_read,
227 .write = acpi_thermal_write_cooling_mode,
228 .llseek = seq_lseek,
229 .release = single_release,
230 };
231
232 static const struct file_operations acpi_thermal_polling_fops = {
233 .open = acpi_thermal_polling_open_fs,
234 .read = seq_read,
235 .write = acpi_thermal_write_polling,
236 .llseek = seq_lseek,
237 .release = single_release,
238 };
239
240 /* --------------------------------------------------------------------------
241 Thermal Zone Management
242 -------------------------------------------------------------------------- */
243
244 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
245 {
246 acpi_status status = AE_OK;
247
248
249 if (!tz)
250 return -EINVAL;
251
252 tz->last_temperature = tz->temperature;
253
254 status =
255 acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
256 if (ACPI_FAILURE(status))
257 return -ENODEV;
258
259 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
260 tz->temperature));
261
262 return 0;
263 }
264
265 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
266 {
267 acpi_status status = AE_OK;
268
269
270 if (!tz)
271 return -EINVAL;
272
273 status =
274 acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
275 &tz->polling_frequency);
276 if (ACPI_FAILURE(status))
277 return -ENODEV;
278
279 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
280 tz->polling_frequency));
281
282 return 0;
283 }
284
285 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
286 {
287
288 if (!tz)
289 return -EINVAL;
290
291 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */
292
293 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
294 "Polling frequency set to %lu seconds\n",
295 tz->polling_frequency/10));
296
297 return 0;
298 }
299
300 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
301 {
302 acpi_status status = AE_OK;
303 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
304 struct acpi_object_list arg_list = { 1, &arg0 };
305 acpi_handle handle = NULL;
306
307
308 if (!tz)
309 return -EINVAL;
310
311 status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
312 if (ACPI_FAILURE(status)) {
313 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
314 return -ENODEV;
315 }
316
317 arg0.integer.value = mode;
318
319 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
320 if (ACPI_FAILURE(status))
321 return -ENODEV;
322
323 return 0;
324 }
325
326 #define ACPI_TRIPS_CRITICAL 0x01
327 #define ACPI_TRIPS_HOT 0x02
328 #define ACPI_TRIPS_PASSIVE 0x04
329 #define ACPI_TRIPS_ACTIVE 0x08
330 #define ACPI_TRIPS_DEVICES 0x10
331
332 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
333 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
334
335 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
336 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
337 ACPI_TRIPS_DEVICES)
338
339 /*
340 * This exception is thrown out in two cases:
341 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
342 * when re-evaluating the AML code.
343 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
344 * We need to re-bind the cooling devices of a thermal zone when this occurs.
345 */
346 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
347 do { \
348 if (flags != ACPI_TRIPS_INIT) \
349 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
350 "ACPI thermal trip point %s changed\n" \
351 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
352 } while (0)
353
354 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
355 {
356 acpi_status status = AE_OK;
357 struct acpi_handle_list devices;
358 int valid = 0;
359 int i;
360
361 /* Critical Shutdown (required) */
362 if (flag & ACPI_TRIPS_CRITICAL) {
363 status = acpi_evaluate_integer(tz->device->handle,
364 "_CRT", NULL, &tz->trips.critical.temperature);
365 if (ACPI_FAILURE(status)) {
366 tz->trips.critical.flags.valid = 0;
367 ACPI_EXCEPTION((AE_INFO, status,
368 "No critical threshold"));
369 return -ENODEV;
370 } else {
371 tz->trips.critical.flags.valid = 1;
372 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
373 "Found critical threshold [%lu]\n",
374 tz->trips.critical.temperature));
375 }
376 if (tz->trips.critical.flags.valid == 1) {
377 if (crt == -1) {
378 tz->trips.critical.flags.valid = 0;
379 } else if (crt > 0) {
380 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
381 /*
382 * Allow override to lower critical threshold
383 */
384 if (crt_k < tz->trips.critical.temperature)
385 tz->trips.critical.temperature = crt_k;
386 }
387 }
388 }
389
390 /* Critical Sleep (optional) */
391 if (flag & ACPI_TRIPS_HOT) {
392 status = acpi_evaluate_integer(tz->device->handle,
393 "_HOT", NULL, &tz->trips.hot.temperature);
394 if (ACPI_FAILURE(status)) {
395 tz->trips.hot.flags.valid = 0;
396 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
397 "No hot threshold\n"));
398 } else {
399 tz->trips.hot.flags.valid = 1;
400 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
401 "Found hot threshold [%lu]\n",
402 tz->trips.critical.temperature));
403 }
404 }
405
406 /* Passive (optional) */
407 if (flag & ACPI_TRIPS_PASSIVE) {
408 valid = tz->trips.passive.flags.valid;
409 if (psv == -1) {
410 status = AE_SUPPORT;
411 } else if (psv > 0) {
412 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
413 status = AE_OK;
414 } else {
415 status = acpi_evaluate_integer(tz->device->handle,
416 "_PSV", NULL, &tz->trips.passive.temperature);
417 }
418
419 if (ACPI_FAILURE(status))
420 tz->trips.passive.flags.valid = 0;
421 else {
422 tz->trips.passive.flags.valid = 1;
423 if (flag == ACPI_TRIPS_INIT) {
424 status = acpi_evaluate_integer(
425 tz->device->handle, "_TC1",
426 NULL, &tz->trips.passive.tc1);
427 if (ACPI_FAILURE(status))
428 tz->trips.passive.flags.valid = 0;
429 status = acpi_evaluate_integer(
430 tz->device->handle, "_TC2",
431 NULL, &tz->trips.passive.tc2);
432 if (ACPI_FAILURE(status))
433 tz->trips.passive.flags.valid = 0;
434 status = acpi_evaluate_integer(
435 tz->device->handle, "_TSP",
436 NULL, &tz->trips.passive.tsp);
437 if (ACPI_FAILURE(status))
438 tz->trips.passive.flags.valid = 0;
439 }
440 }
441 }
442 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
443 memset(&devices, 0, sizeof(struct acpi_handle_list));
444 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
445 NULL, &devices);
446 if (ACPI_FAILURE(status))
447 tz->trips.passive.flags.valid = 0;
448 else
449 tz->trips.passive.flags.valid = 1;
450
451 if (memcmp(&tz->trips.passive.devices, &devices,
452 sizeof(struct acpi_handle_list))) {
453 memcpy(&tz->trips.passive.devices, &devices,
454 sizeof(struct acpi_handle_list));
455 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
456 }
457 }
458 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
459 if (valid != tz->trips.passive.flags.valid)
460 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
461 }
462
463 /* Active (optional) */
464 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
465 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
466 valid = tz->trips.active[i].flags.valid;
467
468 if (act == -1)
469 break; /* disable all active trip points */
470
471 if (flag & ACPI_TRIPS_ACTIVE) {
472 status = acpi_evaluate_integer(tz->device->handle,
473 name, NULL, &tz->trips.active[i].temperature);
474 if (ACPI_FAILURE(status)) {
475 tz->trips.active[i].flags.valid = 0;
476 if (i == 0)
477 break;
478 if (act <= 0)
479 break;
480 if (i == 1)
481 tz->trips.active[0].temperature =
482 CELSIUS_TO_KELVIN(act);
483 else
484 /*
485 * Don't allow override higher than
486 * the next higher trip point
487 */
488 tz->trips.active[i - 1].temperature =
489 (tz->trips.active[i - 2].temperature <
490 CELSIUS_TO_KELVIN(act) ?
491 tz->trips.active[i - 2].temperature :
492 CELSIUS_TO_KELVIN(act));
493 break;
494 } else
495 tz->trips.active[i].flags.valid = 1;
496 }
497
498 name[2] = 'L';
499 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
500 memset(&devices, 0, sizeof(struct acpi_handle_list));
501 status = acpi_evaluate_reference(tz->device->handle,
502 name, NULL, &devices);
503 if (ACPI_FAILURE(status))
504 tz->trips.active[i].flags.valid = 0;
505 else
506 tz->trips.active[i].flags.valid = 1;
507
508 if (memcmp(&tz->trips.active[i].devices, &devices,
509 sizeof(struct acpi_handle_list))) {
510 memcpy(&tz->trips.active[i].devices, &devices,
511 sizeof(struct acpi_handle_list));
512 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
513 }
514 }
515 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
516 if (valid != tz->trips.active[i].flags.valid)
517 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
518
519 if (!tz->trips.active[i].flags.valid)
520 break;
521 }
522
523 if (flag & ACPI_TRIPS_DEVICES) {
524 memset(&devices, 0, sizeof(struct acpi_handle_list));
525 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
526 NULL, &devices);
527 if (memcmp(&tz->devices, &devices,
528 sizeof(struct acpi_handle_list))) {
529 memcpy(&tz->devices, &devices,
530 sizeof(struct acpi_handle_list));
531 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
532 }
533 }
534
535 return 0;
536 }
537
538 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
539 {
540 return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
541 }
542
543 static int acpi_thermal_critical(struct acpi_thermal *tz)
544 {
545 if (!tz || !tz->trips.critical.flags.valid || nocrt)
546 return -EINVAL;
547
548 if (tz->temperature >= tz->trips.critical.temperature) {
549 printk(KERN_WARNING PREFIX "Critical trip point\n");
550 tz->trips.critical.flags.enabled = 1;
551 } else if (tz->trips.critical.flags.enabled)
552 tz->trips.critical.flags.enabled = 0;
553
554 printk(KERN_EMERG
555 "Critical temperature reached (%ld C), shutting down.\n",
556 KELVIN_TO_CELSIUS(tz->temperature));
557 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
558 tz->trips.critical.flags.enabled);
559 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
560 tz->device->dev.bus_id,
561 ACPI_THERMAL_NOTIFY_CRITICAL,
562 tz->trips.critical.flags.enabled);
563
564 orderly_poweroff(true);
565
566 return 0;
567 }
568
569 static int acpi_thermal_hot(struct acpi_thermal *tz)
570 {
571 if (!tz || !tz->trips.hot.flags.valid || nocrt)
572 return -EINVAL;
573
574 if (tz->temperature >= tz->trips.hot.temperature) {
575 printk(KERN_WARNING PREFIX "Hot trip point\n");
576 tz->trips.hot.flags.enabled = 1;
577 } else if (tz->trips.hot.flags.enabled)
578 tz->trips.hot.flags.enabled = 0;
579
580 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
581 tz->trips.hot.flags.enabled);
582 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
583 tz->device->dev.bus_id,
584 ACPI_THERMAL_NOTIFY_HOT,
585 tz->trips.hot.flags.enabled);
586
587 /* TBD: Call user-mode "sleep(S4)" function */
588
589 return 0;
590 }
591
592 static void acpi_thermal_passive(struct acpi_thermal *tz)
593 {
594 int result = 1;
595 struct acpi_thermal_passive *passive = NULL;
596 int trend = 0;
597 int i = 0;
598
599
600 if (!tz || !tz->trips.passive.flags.valid)
601 return;
602
603 passive = &(tz->trips.passive);
604
605 /*
606 * Above Trip?
607 * -----------
608 * Calculate the thermal trend (using the passive cooling equation)
609 * and modify the performance limit for all passive cooling devices
610 * accordingly. Note that we assume symmetry.
611 */
612 if (tz->temperature >= passive->temperature) {
613 trend =
614 (passive->tc1 * (tz->temperature - tz->last_temperature)) +
615 (passive->tc2 * (tz->temperature - passive->temperature));
616 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
617 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
618 trend, passive->tc1, tz->temperature,
619 tz->last_temperature, passive->tc2,
620 tz->temperature, passive->temperature));
621 passive->flags.enabled = 1;
622 /* Heating up? */
623 if (trend > 0)
624 for (i = 0; i < passive->devices.count; i++)
625 acpi_processor_set_thermal_limit(passive->
626 devices.
627 handles[i],
628 ACPI_PROCESSOR_LIMIT_INCREMENT);
629 /* Cooling off? */
630 else if (trend < 0) {
631 for (i = 0; i < passive->devices.count; i++)
632 /*
633 * assume that we are on highest
634 * freq/lowest thrott and can leave
635 * passive mode, even in error case
636 */
637 if (!acpi_processor_set_thermal_limit
638 (passive->devices.handles[i],
639 ACPI_PROCESSOR_LIMIT_DECREMENT))
640 result = 0;
641 /*
642 * Leave cooling mode, even if the temp might
643 * higher than trip point This is because some
644 * machines might have long thermal polling
645 * frequencies (tsp) defined. We will fall back
646 * into passive mode in next cycle (probably quicker)
647 */
648 if (result) {
649 passive->flags.enabled = 0;
650 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
651 "Disabling passive cooling, still above threshold,"
652 " but we are cooling down\n"));
653 }
654 }
655 return;
656 }
657
658 /*
659 * Below Trip?
660 * -----------
661 * Implement passive cooling hysteresis to slowly increase performance
662 * and avoid thrashing around the passive trip point. Note that we
663 * assume symmetry.
664 */
665 if (!passive->flags.enabled)
666 return;
667 for (i = 0; i < passive->devices.count; i++)
668 if (!acpi_processor_set_thermal_limit
669 (passive->devices.handles[i],
670 ACPI_PROCESSOR_LIMIT_DECREMENT))
671 result = 0;
672 if (result) {
673 passive->flags.enabled = 0;
674 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
675 "Disabling passive cooling (zone is cool)\n"));
676 }
677 }
678
679 static void acpi_thermal_active(struct acpi_thermal *tz)
680 {
681 int result = 0;
682 struct acpi_thermal_active *active = NULL;
683 int i = 0;
684 int j = 0;
685 unsigned long maxtemp = 0;
686
687
688 if (!tz)
689 return;
690
691 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
692 active = &(tz->trips.active[i]);
693 if (!active || !active->flags.valid)
694 break;
695 if (tz->temperature >= active->temperature) {
696 /*
697 * Above Threshold?
698 * ----------------
699 * If not already enabled, turn ON all cooling devices
700 * associated with this active threshold.
701 */
702 if (active->temperature > maxtemp)
703 tz->state.active_index = i;
704 maxtemp = active->temperature;
705 if (active->flags.enabled)
706 continue;
707 for (j = 0; j < active->devices.count; j++) {
708 result =
709 acpi_bus_set_power(active->devices.
710 handles[j],
711 ACPI_STATE_D0);
712 if (result) {
713 printk(KERN_WARNING PREFIX
714 "Unable to turn cooling device [%p] 'on'\n",
715 active->devices.
716 handles[j]);
717 continue;
718 }
719 active->flags.enabled = 1;
720 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
721 "Cooling device [%p] now 'on'\n",
722 active->devices.handles[j]));
723 }
724 continue;
725 }
726 if (!active->flags.enabled)
727 continue;
728 /*
729 * Below Threshold?
730 * ----------------
731 * Turn OFF all cooling devices associated with this
732 * threshold.
733 */
734 for (j = 0; j < active->devices.count; j++) {
735 result = acpi_bus_set_power(active->devices.handles[j],
736 ACPI_STATE_D3);
737 if (result) {
738 printk(KERN_WARNING PREFIX
739 "Unable to turn cooling device [%p] 'off'\n",
740 active->devices.handles[j]);
741 continue;
742 }
743 active->flags.enabled = 0;
744 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
745 "Cooling device [%p] now 'off'\n",
746 active->devices.handles[j]));
747 }
748 }
749 }
750
751 static void acpi_thermal_check(void *context);
752
753 static void acpi_thermal_run(unsigned long data)
754 {
755 struct acpi_thermal *tz = (struct acpi_thermal *)data;
756 if (!tz->zombie)
757 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
758 }
759
760 static void acpi_thermal_check(void *data)
761 {
762 int result = 0;
763 struct acpi_thermal *tz = data;
764 unsigned long sleep_time = 0;
765 unsigned long timeout_jiffies = 0;
766 int i = 0;
767 struct acpi_thermal_state state;
768
769
770 if (!tz) {
771 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
772 return;
773 }
774
775 /* Check if someone else is already running */
776 if (!mutex_trylock(&tz->lock))
777 return;
778
779 state = tz->state;
780
781 result = acpi_thermal_get_temperature(tz);
782 if (result)
783 goto unlock;
784
785 if (!tz->tz_enabled)
786 goto unlock;
787
788 memset(&tz->state, 0, sizeof(tz->state));
789
790 /*
791 * Check Trip Points
792 * -----------------
793 * Compare the current temperature to the trip point values to see
794 * if we've entered one of the thermal policy states. Note that
795 * this function determines when a state is entered, but the
796 * individual policy decides when it is exited (e.g. hysteresis).
797 */
798 if (tz->trips.critical.flags.valid)
799 state.critical |=
800 (tz->temperature >= tz->trips.critical.temperature);
801 if (tz->trips.hot.flags.valid)
802 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
803 if (tz->trips.passive.flags.valid)
804 state.passive |=
805 (tz->temperature >= tz->trips.passive.temperature);
806 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
807 if (tz->trips.active[i].flags.valid)
808 state.active |=
809 (tz->temperature >=
810 tz->trips.active[i].temperature);
811
812 /*
813 * Invoke Policy
814 * -------------
815 * Separated from the above check to allow individual policy to
816 * determine when to exit a given state.
817 */
818 if (state.critical)
819 acpi_thermal_critical(tz);
820 if (state.hot)
821 acpi_thermal_hot(tz);
822 if (state.passive)
823 acpi_thermal_passive(tz);
824 if (state.active)
825 acpi_thermal_active(tz);
826
827 /*
828 * Calculate State
829 * ---------------
830 * Again, separated from the above two to allow independent policy
831 * decisions.
832 */
833 tz->state.critical = tz->trips.critical.flags.enabled;
834 tz->state.hot = tz->trips.hot.flags.enabled;
835 tz->state.passive = tz->trips.passive.flags.enabled;
836 tz->state.active = 0;
837 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
838 tz->state.active |= tz->trips.active[i].flags.enabled;
839
840 /*
841 * Calculate Sleep Time
842 * --------------------
843 * If we're in the passive state, use _TSP's value. Otherwise
844 * use the default polling frequency (e.g. _TZP). If no polling
845 * frequency is specified then we'll wait forever (at least until
846 * a thermal event occurs). Note that _TSP and _TZD values are
847 * given in 1/10th seconds (we must covert to milliseconds).
848 */
849 if (tz->state.passive) {
850 sleep_time = tz->trips.passive.tsp * 100;
851 timeout_jiffies = jiffies + (HZ * sleep_time) / 1000;
852 } else if (tz->polling_frequency > 0) {
853 sleep_time = tz->polling_frequency * 100;
854 timeout_jiffies = round_jiffies(jiffies + (HZ * sleep_time) / 1000);
855 }
856
857 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
858 tz->name, tz->temperature, sleep_time));
859
860 /*
861 * Schedule Next Poll
862 * ------------------
863 */
864 if (!sleep_time) {
865 if (timer_pending(&(tz->timer)))
866 del_timer(&(tz->timer));
867 } else {
868 if (timer_pending(&(tz->timer)))
869 mod_timer(&(tz->timer), timeout_jiffies);
870 else {
871 tz->timer.data = (unsigned long)tz;
872 tz->timer.function = acpi_thermal_run;
873 tz->timer.expires = timeout_jiffies;
874 add_timer(&(tz->timer));
875 }
876 }
877 unlock:
878 mutex_unlock(&tz->lock);
879 }
880
881 /* sys I/F for generic thermal sysfs support */
882 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
883 {
884 struct acpi_thermal *tz = thermal->devdata;
885
886 if (!tz)
887 return -EINVAL;
888
889 return sprintf(buf, "%ld\n", KELVIN_TO_CELSIUS(tz->temperature));
890 }
891
892 static const char enabled[] = "kernel";
893 static const char disabled[] = "user";
894 static int thermal_get_mode(struct thermal_zone_device *thermal,
895 char *buf)
896 {
897 struct acpi_thermal *tz = thermal->devdata;
898
899 if (!tz)
900 return -EINVAL;
901
902 return sprintf(buf, "%s\n", tz->tz_enabled ?
903 enabled : disabled);
904 }
905
906 static int thermal_set_mode(struct thermal_zone_device *thermal,
907 const char *buf)
908 {
909 struct acpi_thermal *tz = thermal->devdata;
910 int enable;
911
912 if (!tz)
913 return -EINVAL;
914
915 /*
916 * enable/disable thermal management from ACPI thermal driver
917 */
918 if (!strncmp(buf, enabled, sizeof enabled - 1))
919 enable = 1;
920 else if (!strncmp(buf, disabled, sizeof disabled - 1))
921 enable = 0;
922 else
923 return -EINVAL;
924
925 if (enable != tz->tz_enabled) {
926 tz->tz_enabled = enable;
927 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
928 "%s ACPI thermal control\n",
929 tz->tz_enabled ? enabled : disabled));
930 acpi_thermal_check(tz);
931 }
932 return 0;
933 }
934
935 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
936 int trip, char *buf)
937 {
938 struct acpi_thermal *tz = thermal->devdata;
939 int i;
940
941 if (!tz || trip < 0)
942 return -EINVAL;
943
944 if (tz->trips.critical.flags.valid) {
945 if (!trip)
946 return sprintf(buf, "critical\n");
947 trip--;
948 }
949
950 if (tz->trips.hot.flags.valid) {
951 if (!trip)
952 return sprintf(buf, "hot\n");
953 trip--;
954 }
955
956 if (tz->trips.passive.flags.valid) {
957 if (!trip)
958 return sprintf(buf, "passive\n");
959 trip--;
960 }
961
962 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
963 tz->trips.active[i].flags.valid; i++) {
964 if (!trip)
965 return sprintf(buf, "active%d\n", i);
966 trip--;
967 }
968
969 return -EINVAL;
970 }
971
972 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
973 int trip, char *buf)
974 {
975 struct acpi_thermal *tz = thermal->devdata;
976 int i;
977
978 if (!tz || trip < 0)
979 return -EINVAL;
980
981 if (tz->trips.critical.flags.valid) {
982 if (!trip)
983 return sprintf(buf, "%ld\n", KELVIN_TO_CELSIUS(
984 tz->trips.critical.temperature));
985 trip--;
986 }
987
988 if (tz->trips.hot.flags.valid) {
989 if (!trip)
990 return sprintf(buf, "%ld\n", KELVIN_TO_CELSIUS(
991 tz->trips.hot.temperature));
992 trip--;
993 }
994
995 if (tz->trips.passive.flags.valid) {
996 if (!trip)
997 return sprintf(buf, "%ld\n", KELVIN_TO_CELSIUS(
998 tz->trips.passive.temperature));
999 trip--;
1000 }
1001
1002 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1003 tz->trips.active[i].flags.valid; i++) {
1004 if (!trip)
1005 return sprintf(buf, "%ld\n", KELVIN_TO_CELSIUS(
1006 tz->trips.active[i].temperature));
1007 trip--;
1008 }
1009
1010 return -EINVAL;
1011 }
1012
1013 typedef int (*cb)(struct thermal_zone_device *, int,
1014 struct thermal_cooling_device *);
1015 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
1016 struct thermal_cooling_device *cdev,
1017 cb action)
1018 {
1019 struct acpi_device *device = cdev->devdata;
1020 struct acpi_thermal *tz = thermal->devdata;
1021 acpi_handle handle = device->handle;
1022 int i;
1023 int j;
1024 int trip = -1;
1025 int result = 0;
1026
1027 if (tz->trips.critical.flags.valid)
1028 trip++;
1029
1030 if (tz->trips.hot.flags.valid)
1031 trip++;
1032
1033 if (tz->trips.passive.flags.valid) {
1034 trip++;
1035 for (i = 0; i < tz->trips.passive.devices.count;
1036 i++) {
1037 if (tz->trips.passive.devices.handles[i] !=
1038 handle)
1039 continue;
1040 result = action(thermal, trip, cdev);
1041 if (result)
1042 goto failed;
1043 }
1044 }
1045
1046 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1047 if (!tz->trips.active[i].flags.valid)
1048 break;
1049 trip++;
1050 for (j = 0;
1051 j < tz->trips.active[i].devices.count;
1052 j++) {
1053 if (tz->trips.active[i].devices.
1054 handles[j] != handle)
1055 continue;
1056 result = action(thermal, trip, cdev);
1057 if (result)
1058 goto failed;
1059 }
1060 }
1061
1062 for (i = 0; i < tz->devices.count; i++) {
1063 if (tz->devices.handles[i] != handle)
1064 continue;
1065 result = action(thermal, -1, cdev);
1066 if (result)
1067 goto failed;
1068 }
1069
1070 failed:
1071 return result;
1072 }
1073
1074 static int
1075 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1076 struct thermal_cooling_device *cdev)
1077 {
1078 return acpi_thermal_cooling_device_cb(thermal, cdev,
1079 thermal_zone_bind_cooling_device);
1080 }
1081
1082 static int
1083 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
1084 struct thermal_cooling_device *cdev)
1085 {
1086 return acpi_thermal_cooling_device_cb(thermal, cdev,
1087 thermal_zone_unbind_cooling_device);
1088 }
1089
1090 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1091 .bind = acpi_thermal_bind_cooling_device,
1092 .unbind = acpi_thermal_unbind_cooling_device,
1093 .get_temp = thermal_get_temp,
1094 .get_mode = thermal_get_mode,
1095 .set_mode = thermal_set_mode,
1096 .get_trip_type = thermal_get_trip_type,
1097 .get_trip_temp = thermal_get_trip_temp,
1098 };
1099
1100 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1101 {
1102 int trips = 0;
1103 int result;
1104 int i;
1105
1106 if (tz->trips.critical.flags.valid)
1107 trips++;
1108
1109 if (tz->trips.hot.flags.valid)
1110 trips++;
1111
1112 if (tz->trips.passive.flags.valid)
1113 trips++;
1114
1115 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1116 tz->trips.active[i].flags.valid; i++, trips++);
1117 tz->thermal_zone = thermal_zone_device_register("ACPI thermal zone",
1118 trips, tz, &acpi_thermal_zone_ops);
1119 if (!tz->thermal_zone)
1120 return -ENODEV;
1121
1122 result = sysfs_create_link(&tz->device->dev.kobj,
1123 &tz->thermal_zone->device.kobj, "thermal_zone");
1124 if (result)
1125 return result;
1126
1127 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1128 &tz->device->dev.kobj, "device");
1129 if (result)
1130 return result;
1131
1132 tz->tz_enabled = 1;
1133
1134 printk(KERN_INFO PREFIX "%s is registered as thermal_zone%d\n",
1135 tz->device->dev.bus_id, tz->thermal_zone->id);
1136 return 0;
1137 }
1138
1139 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1140 {
1141 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1142 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1143 thermal_zone_device_unregister(tz->thermal_zone);
1144 tz->thermal_zone = NULL;
1145 }
1146
1147
1148 /* --------------------------------------------------------------------------
1149 FS Interface (/proc)
1150 -------------------------------------------------------------------------- */
1151
1152 static struct proc_dir_entry *acpi_thermal_dir;
1153
1154 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1155 {
1156 struct acpi_thermal *tz = seq->private;
1157
1158
1159 if (!tz)
1160 goto end;
1161
1162 seq_puts(seq, "state: ");
1163
1164 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1165 && !tz->state.active)
1166 seq_puts(seq, "ok\n");
1167 else {
1168 if (tz->state.critical)
1169 seq_puts(seq, "critical ");
1170 if (tz->state.hot)
1171 seq_puts(seq, "hot ");
1172 if (tz->state.passive)
1173 seq_puts(seq, "passive ");
1174 if (tz->state.active)
1175 seq_printf(seq, "active[%d]", tz->state.active_index);
1176 seq_puts(seq, "\n");
1177 }
1178
1179 end:
1180 return 0;
1181 }
1182
1183 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1184 {
1185 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1186 }
1187
1188 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1189 {
1190 int result = 0;
1191 struct acpi_thermal *tz = seq->private;
1192
1193
1194 if (!tz)
1195 goto end;
1196
1197 result = acpi_thermal_get_temperature(tz);
1198 if (result)
1199 goto end;
1200
1201 seq_printf(seq, "temperature: %ld C\n",
1202 KELVIN_TO_CELSIUS(tz->temperature));
1203
1204 end:
1205 return 0;
1206 }
1207
1208 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1209 {
1210 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1211 }
1212
1213 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1214 {
1215 struct acpi_thermal *tz = seq->private;
1216 struct acpi_device *device;
1217 acpi_status status;
1218
1219 int i = 0;
1220 int j = 0;
1221
1222
1223 if (!tz)
1224 goto end;
1225
1226 if (tz->trips.critical.flags.valid)
1227 seq_printf(seq, "critical (S5): %ld C%s",
1228 KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1229 nocrt ? " <disabled>\n" : "\n");
1230
1231 if (tz->trips.hot.flags.valid)
1232 seq_printf(seq, "hot (S4): %ld C%s",
1233 KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1234 nocrt ? " <disabled>\n" : "\n");
1235
1236 if (tz->trips.passive.flags.valid) {
1237 seq_printf(seq,
1238 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1239 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1240 tz->trips.passive.tc1, tz->trips.passive.tc2,
1241 tz->trips.passive.tsp);
1242 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1243 status = acpi_bus_get_device(tz->trips.passive.devices.
1244 handles[j], &device);
1245 seq_printf(seq, "%4.4s ", status ? "" :
1246 acpi_device_bid(device));
1247 }
1248 seq_puts(seq, "\n");
1249 }
1250
1251 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1252 if (!(tz->trips.active[i].flags.valid))
1253 break;
1254 seq_printf(seq, "active[%d]: %ld C: devices=",
1255 i,
1256 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1257 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1258 status = acpi_bus_get_device(tz->trips.active[i].
1259 devices.handles[j],
1260 &device);
1261 seq_printf(seq, "%4.4s ", status ? "" :
1262 acpi_device_bid(device));
1263 }
1264 seq_puts(seq, "\n");
1265 }
1266
1267 end:
1268 return 0;
1269 }
1270
1271 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1272 {
1273 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1274 }
1275
1276 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1277 {
1278 struct acpi_thermal *tz = seq->private;
1279
1280
1281 if (!tz)
1282 goto end;
1283
1284 if (!tz->flags.cooling_mode)
1285 seq_puts(seq, "<setting not supported>\n");
1286 else
1287 seq_puts(seq, "0 - Active; 1 - Passive\n");
1288
1289 end:
1290 return 0;
1291 }
1292
1293 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1294 {
1295 return single_open(file, acpi_thermal_cooling_seq_show,
1296 PDE(inode)->data);
1297 }
1298
1299 static ssize_t
1300 acpi_thermal_write_cooling_mode(struct file *file,
1301 const char __user * buffer,
1302 size_t count, loff_t * ppos)
1303 {
1304 struct seq_file *m = file->private_data;
1305 struct acpi_thermal *tz = m->private;
1306 int result = 0;
1307 char mode_string[12] = { '\0' };
1308
1309
1310 if (!tz || (count > sizeof(mode_string) - 1))
1311 return -EINVAL;
1312
1313 if (!tz->flags.cooling_mode)
1314 return -ENODEV;
1315
1316 if (copy_from_user(mode_string, buffer, count))
1317 return -EFAULT;
1318
1319 mode_string[count] = '\0';
1320
1321 result = acpi_thermal_set_cooling_mode(tz,
1322 simple_strtoul(mode_string, NULL,
1323 0));
1324 if (result)
1325 return result;
1326
1327 acpi_thermal_check(tz);
1328
1329 return count;
1330 }
1331
1332 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1333 {
1334 struct acpi_thermal *tz = seq->private;
1335
1336
1337 if (!tz)
1338 goto end;
1339
1340 if (!tz->polling_frequency) {
1341 seq_puts(seq, "<polling disabled>\n");
1342 goto end;
1343 }
1344
1345 seq_printf(seq, "polling frequency: %lu seconds\n",
1346 (tz->polling_frequency / 10));
1347
1348 end:
1349 return 0;
1350 }
1351
1352 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1353 {
1354 return single_open(file, acpi_thermal_polling_seq_show,
1355 PDE(inode)->data);
1356 }
1357
1358 static ssize_t
1359 acpi_thermal_write_polling(struct file *file,
1360 const char __user * buffer,
1361 size_t count, loff_t * ppos)
1362 {
1363 struct seq_file *m = file->private_data;
1364 struct acpi_thermal *tz = m->private;
1365 int result = 0;
1366 char polling_string[12] = { '\0' };
1367 int seconds = 0;
1368
1369
1370 if (!tz || (count > sizeof(polling_string) - 1))
1371 return -EINVAL;
1372
1373 if (copy_from_user(polling_string, buffer, count))
1374 return -EFAULT;
1375
1376 polling_string[count] = '\0';
1377
1378 seconds = simple_strtoul(polling_string, NULL, 0);
1379
1380 result = acpi_thermal_set_polling(tz, seconds);
1381 if (result)
1382 return result;
1383
1384 acpi_thermal_check(tz);
1385
1386 return count;
1387 }
1388
1389 static int acpi_thermal_add_fs(struct acpi_device *device)
1390 {
1391 struct proc_dir_entry *entry = NULL;
1392
1393
1394 if (!acpi_device_dir(device)) {
1395 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1396 acpi_thermal_dir);
1397 if (!acpi_device_dir(device))
1398 return -ENODEV;
1399 acpi_device_dir(device)->owner = THIS_MODULE;
1400 }
1401
1402 /* 'state' [R] */
1403 entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1404 S_IRUGO, acpi_device_dir(device));
1405 if (!entry)
1406 return -ENODEV;
1407 else {
1408 entry->proc_fops = &acpi_thermal_state_fops;
1409 entry->data = acpi_driver_data(device);
1410 entry->owner = THIS_MODULE;
1411 }
1412
1413 /* 'temperature' [R] */
1414 entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1415 S_IRUGO, acpi_device_dir(device));
1416 if (!entry)
1417 return -ENODEV;
1418 else {
1419 entry->proc_fops = &acpi_thermal_temp_fops;
1420 entry->data = acpi_driver_data(device);
1421 entry->owner = THIS_MODULE;
1422 }
1423
1424 /* 'trip_points' [R] */
1425 entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1426 S_IRUGO,
1427 acpi_device_dir(device));
1428 if (!entry)
1429 return -ENODEV;
1430 else {
1431 entry->proc_fops = &acpi_thermal_trip_fops;
1432 entry->data = acpi_driver_data(device);
1433 entry->owner = THIS_MODULE;
1434 }
1435
1436 /* 'cooling_mode' [R/W] */
1437 entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1438 S_IFREG | S_IRUGO | S_IWUSR,
1439 acpi_device_dir(device));
1440 if (!entry)
1441 return -ENODEV;
1442 else {
1443 entry->proc_fops = &acpi_thermal_cooling_fops;
1444 entry->data = acpi_driver_data(device);
1445 entry->owner = THIS_MODULE;
1446 }
1447
1448 /* 'polling_frequency' [R/W] */
1449 entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1450 S_IFREG | S_IRUGO | S_IWUSR,
1451 acpi_device_dir(device));
1452 if (!entry)
1453 return -ENODEV;
1454 else {
1455 entry->proc_fops = &acpi_thermal_polling_fops;
1456 entry->data = acpi_driver_data(device);
1457 entry->owner = THIS_MODULE;
1458 }
1459
1460 return 0;
1461 }
1462
1463 static int acpi_thermal_remove_fs(struct acpi_device *device)
1464 {
1465
1466 if (acpi_device_dir(device)) {
1467 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1468 acpi_device_dir(device));
1469 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1470 acpi_device_dir(device));
1471 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1472 acpi_device_dir(device));
1473 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1474 acpi_device_dir(device));
1475 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1476 acpi_device_dir(device));
1477 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1478 acpi_device_dir(device) = NULL;
1479 }
1480
1481 return 0;
1482 }
1483
1484 /* --------------------------------------------------------------------------
1485 Driver Interface
1486 -------------------------------------------------------------------------- */
1487
1488 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1489 {
1490 struct acpi_thermal *tz = data;
1491 struct acpi_device *device = NULL;
1492
1493
1494 if (!tz)
1495 return;
1496
1497 device = tz->device;
1498
1499 switch (event) {
1500 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1501 acpi_thermal_check(tz);
1502 break;
1503 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1504 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1505 acpi_thermal_check(tz);
1506 acpi_bus_generate_proc_event(device, event, 0);
1507 acpi_bus_generate_netlink_event(device->pnp.device_class,
1508 device->dev.bus_id, event, 0);
1509 break;
1510 case ACPI_THERMAL_NOTIFY_DEVICES:
1511 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1512 acpi_thermal_check(tz);
1513 acpi_bus_generate_proc_event(device, event, 0);
1514 acpi_bus_generate_netlink_event(device->pnp.device_class,
1515 device->dev.bus_id, event, 0);
1516 break;
1517 default:
1518 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1519 "Unsupported event [0x%x]\n", event));
1520 break;
1521 }
1522
1523 return;
1524 }
1525
1526 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1527 {
1528 int result = 0;
1529
1530
1531 if (!tz)
1532 return -EINVAL;
1533
1534 /* Get temperature [_TMP] (required) */
1535 result = acpi_thermal_get_temperature(tz);
1536 if (result)
1537 return result;
1538
1539 /* Get trip points [_CRT, _PSV, etc.] (required) */
1540 result = acpi_thermal_get_trip_points(tz);
1541 if (result)
1542 return result;
1543
1544 /* Set the cooling mode [_SCP] to active cooling (default) */
1545 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1546 if (!result)
1547 tz->flags.cooling_mode = 1;
1548
1549 /* Get default polling frequency [_TZP] (optional) */
1550 if (tzp)
1551 tz->polling_frequency = tzp;
1552 else
1553 acpi_thermal_get_polling_frequency(tz);
1554
1555 return 0;
1556 }
1557
1558 static int acpi_thermal_add(struct acpi_device *device)
1559 {
1560 int result = 0;
1561 acpi_status status = AE_OK;
1562 struct acpi_thermal *tz = NULL;
1563
1564
1565 if (!device)
1566 return -EINVAL;
1567
1568 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1569 if (!tz)
1570 return -ENOMEM;
1571
1572 tz->device = device;
1573 strcpy(tz->name, device->pnp.bus_id);
1574 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1575 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1576 acpi_driver_data(device) = tz;
1577 mutex_init(&tz->lock);
1578
1579
1580 result = acpi_thermal_get_info(tz);
1581 if (result)
1582 goto free_memory;
1583
1584 result = acpi_thermal_register_thermal_zone(tz);
1585 if (result)
1586 goto free_memory;
1587
1588 result = acpi_thermal_add_fs(device);
1589 if (result)
1590 goto unregister_thermal_zone;
1591
1592 init_timer(&tz->timer);
1593
1594 acpi_thermal_check(tz);
1595
1596 status = acpi_install_notify_handler(device->handle,
1597 ACPI_DEVICE_NOTIFY,
1598 acpi_thermal_notify, tz);
1599 if (ACPI_FAILURE(status)) {
1600 result = -ENODEV;
1601 goto remove_fs;
1602 }
1603
1604 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1605 acpi_device_name(device), acpi_device_bid(device),
1606 KELVIN_TO_CELSIUS(tz->temperature));
1607 goto end;
1608
1609 remove_fs:
1610 acpi_thermal_remove_fs(device);
1611 unregister_thermal_zone:
1612 thermal_zone_device_unregister(tz->thermal_zone);
1613 free_memory:
1614 kfree(tz);
1615 end:
1616 return result;
1617 }
1618
1619 static int acpi_thermal_remove(struct acpi_device *device, int type)
1620 {
1621 acpi_status status = AE_OK;
1622 struct acpi_thermal *tz = NULL;
1623
1624
1625 if (!device || !acpi_driver_data(device))
1626 return -EINVAL;
1627
1628 tz = acpi_driver_data(device);
1629
1630 /* avoid timer adding new defer task */
1631 tz->zombie = 1;
1632 /* wait for running timer (on other CPUs) finish */
1633 del_timer_sync(&(tz->timer));
1634 /* synchronize deferred task */
1635 acpi_os_wait_events_complete(NULL);
1636 /* deferred task may reinsert timer */
1637 del_timer_sync(&(tz->timer));
1638
1639 status = acpi_remove_notify_handler(device->handle,
1640 ACPI_DEVICE_NOTIFY,
1641 acpi_thermal_notify);
1642
1643 /* Terminate policy */
1644 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1645 tz->trips.passive.flags.enabled = 0;
1646 acpi_thermal_passive(tz);
1647 }
1648 if (tz->trips.active[0].flags.valid
1649 && tz->trips.active[0].flags.enabled) {
1650 tz->trips.active[0].flags.enabled = 0;
1651 acpi_thermal_active(tz);
1652 }
1653
1654 acpi_thermal_remove_fs(device);
1655 acpi_thermal_unregister_thermal_zone(tz);
1656 mutex_destroy(&tz->lock);
1657 kfree(tz);
1658 return 0;
1659 }
1660
1661 static int acpi_thermal_resume(struct acpi_device *device)
1662 {
1663 struct acpi_thermal *tz = NULL;
1664 int i, j, power_state, result;
1665
1666
1667 if (!device || !acpi_driver_data(device))
1668 return -EINVAL;
1669
1670 tz = acpi_driver_data(device);
1671
1672 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1673 if (!(&tz->trips.active[i]))
1674 break;
1675 if (!tz->trips.active[i].flags.valid)
1676 break;
1677 tz->trips.active[i].flags.enabled = 1;
1678 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1679 result = acpi_bus_get_power(tz->trips.active[i].devices.
1680 handles[j], &power_state);
1681 if (result || (power_state != ACPI_STATE_D0)) {
1682 tz->trips.active[i].flags.enabled = 0;
1683 break;
1684 }
1685 }
1686 tz->state.active |= tz->trips.active[i].flags.enabled;
1687 }
1688
1689 acpi_thermal_check(tz);
1690
1691 return AE_OK;
1692 }
1693
1694 #ifdef CONFIG_DMI
1695 static int thermal_act(const struct dmi_system_id *d) {
1696
1697 if (act == 0) {
1698 printk(KERN_NOTICE "ACPI: %s detected: "
1699 "disabling all active thermal trip points\n", d->ident);
1700 act = -1;
1701 }
1702 return 0;
1703 }
1704 static int thermal_nocrt(const struct dmi_system_id *d) {
1705
1706 printk(KERN_NOTICE "ACPI: %s detected: "
1707 "disabling all critical thermal trip point actions.\n", d->ident);
1708 nocrt = 1;
1709 return 0;
1710 }
1711 static int thermal_tzp(const struct dmi_system_id *d) {
1712
1713 if (tzp == 0) {
1714 printk(KERN_NOTICE "ACPI: %s detected: "
1715 "enabling thermal zone polling\n", d->ident);
1716 tzp = 300; /* 300 dS = 30 Seconds */
1717 }
1718 return 0;
1719 }
1720 static int thermal_psv(const struct dmi_system_id *d) {
1721
1722 if (psv == 0) {
1723 printk(KERN_NOTICE "ACPI: %s detected: "
1724 "disabling all passive thermal trip points\n", d->ident);
1725 psv = -1;
1726 }
1727 return 0;
1728 }
1729
1730 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1731 /*
1732 * Award BIOS on this AOpen makes thermal control almost worthless.
1733 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1734 */
1735 {
1736 .callback = thermal_act,
1737 .ident = "AOpen i915GMm-HFS",
1738 .matches = {
1739 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1740 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1741 },
1742 },
1743 {
1744 .callback = thermal_psv,
1745 .ident = "AOpen i915GMm-HFS",
1746 .matches = {
1747 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1748 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1749 },
1750 },
1751 {
1752 .callback = thermal_tzp,
1753 .ident = "AOpen i915GMm-HFS",
1754 .matches = {
1755 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1756 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1757 },
1758 },
1759 {
1760 .callback = thermal_nocrt,
1761 .ident = "Gigabyte GA-7ZX",
1762 .matches = {
1763 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1764 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1765 },
1766 },
1767 {}
1768 };
1769 #endif /* CONFIG_DMI */
1770
1771 static int __init acpi_thermal_init(void)
1772 {
1773 int result = 0;
1774
1775 dmi_check_system(thermal_dmi_table);
1776
1777 if (off) {
1778 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1779 return -ENODEV;
1780 }
1781 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1782 if (!acpi_thermal_dir)
1783 return -ENODEV;
1784 acpi_thermal_dir->owner = THIS_MODULE;
1785
1786 result = acpi_bus_register_driver(&acpi_thermal_driver);
1787 if (result < 0) {
1788 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1789 return -ENODEV;
1790 }
1791
1792 return 0;
1793 }
1794
1795 static void __exit acpi_thermal_exit(void)
1796 {
1797
1798 acpi_bus_unregister_driver(&acpi_thermal_driver);
1799
1800 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1801
1802 return;
1803 }
1804
1805 module_init(acpi_thermal_init);
1806 module_exit(acpi_thermal_exit);
Linux kernel - Deliverables
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