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Merge branch 'misc' into test
[linux-2.6/mini2440.git] / drivers / acpi / thermal.c
blobf26c6463a09eca4d6d94506402a5628faca41b50
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 _COMPONENT ACPI_THERMAL_COMPONENT
69 ACPI_MODULE_NAME("thermal");
70
71 MODULE_AUTHOR("Paul Diefenbaugh");
72 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
73 MODULE_LICENSE("GPL");
74
75 static int act;
76 module_param(act, int, 0644);
77 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
78
79 static int crt;
80 module_param(crt, int, 0644);
81 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
82
83 static int tzp;
84 module_param(tzp, int, 0444);
85 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
86
87 static int nocrt;
88 module_param(nocrt, int, 0);
89 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
90
91 static int off;
92 module_param(off, int, 0);
93 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
94
95 static int psv;
96 module_param(psv, int, 0644);
97 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
98
99 static int acpi_thermal_add(struct acpi_device *device);
100 static int acpi_thermal_remove(struct acpi_device *device, int type);
101 static int acpi_thermal_resume(struct acpi_device *device);
102 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
103 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
104 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
105 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
106 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
107 const char __user *, size_t,
108 loff_t *);
109 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
110 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
111 size_t, loff_t *);
112
113 static const struct acpi_device_id thermal_device_ids[] = {
114 {ACPI_THERMAL_HID, 0},
115 {"", 0},
116 };
117 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
118
119 static struct acpi_driver acpi_thermal_driver = {
120 .name = "thermal",
121 .class = ACPI_THERMAL_CLASS,
122 .ids = thermal_device_ids,
123 .ops = {
124 .add = acpi_thermal_add,
125 .remove = acpi_thermal_remove,
126 .resume = acpi_thermal_resume,
127 },
128 };
129
130 struct acpi_thermal_state {
131 u8 critical:1;
132 u8 hot:1;
133 u8 passive:1;
134 u8 active:1;
135 u8 reserved:4;
136 int active_index;
137 };
138
139 struct acpi_thermal_state_flags {
140 u8 valid:1;
141 u8 enabled:1;
142 u8 reserved:6;
143 };
144
145 struct acpi_thermal_critical {
146 struct acpi_thermal_state_flags flags;
147 unsigned long temperature;
148 };
149
150 struct acpi_thermal_hot {
151 struct acpi_thermal_state_flags flags;
152 unsigned long temperature;
153 };
154
155 struct acpi_thermal_passive {
156 struct acpi_thermal_state_flags flags;
157 unsigned long temperature;
158 unsigned long tc1;
159 unsigned long tc2;
160 unsigned long tsp;
161 struct acpi_handle_list devices;
162 };
163
164 struct acpi_thermal_active {
165 struct acpi_thermal_state_flags flags;
166 unsigned long temperature;
167 struct acpi_handle_list devices;
168 };
169
170 struct acpi_thermal_trips {
171 struct acpi_thermal_critical critical;
172 struct acpi_thermal_hot hot;
173 struct acpi_thermal_passive passive;
174 struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
175 };
176
177 struct acpi_thermal_flags {
178 u8 cooling_mode:1; /* _SCP */
179 u8 devices:1; /* _TZD */
180 u8 reserved:6;
181 };
182
183 struct acpi_thermal {
184 struct acpi_device * device;
185 acpi_bus_id name;
186 unsigned long temperature;
187 unsigned long last_temperature;
188 unsigned long polling_frequency;
189 volatile u8 zombie;
190 struct acpi_thermal_flags flags;
191 struct acpi_thermal_state state;
192 struct acpi_thermal_trips trips;
193 struct acpi_handle_list devices;
194 struct timer_list timer;
195 struct thermal_zone_device *thermal_zone;
196 int tz_enabled;
197 struct mutex lock;
198 };
199
200 static const struct file_operations acpi_thermal_state_fops = {
201 .owner = THIS_MODULE,
202 .open = acpi_thermal_state_open_fs,
203 .read = seq_read,
204 .llseek = seq_lseek,
205 .release = single_release,
206 };
207
208 static const struct file_operations acpi_thermal_temp_fops = {
209 .owner = THIS_MODULE,
210 .open = acpi_thermal_temp_open_fs,
211 .read = seq_read,
212 .llseek = seq_lseek,
213 .release = single_release,
214 };
215
216 static const struct file_operations acpi_thermal_trip_fops = {
217 .owner = THIS_MODULE,
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 .owner = THIS_MODULE,
226 .open = acpi_thermal_cooling_open_fs,
227 .read = seq_read,
228 .write = acpi_thermal_write_cooling_mode,
229 .llseek = seq_lseek,
230 .release = single_release,
231 };
232
233 static const struct file_operations acpi_thermal_polling_fops = {
234 .owner = THIS_MODULE,
235 .open = acpi_thermal_polling_open_fs,
236 .read = seq_read,
237 .write = acpi_thermal_write_polling,
238 .llseek = seq_lseek,
239 .release = single_release,
240 };
241
242 /* --------------------------------------------------------------------------
243 Thermal Zone Management
244 -------------------------------------------------------------------------- */
245
246 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
247 {
248 acpi_status status = AE_OK;
249
250
251 if (!tz)
252 return -EINVAL;
253
254 tz->last_temperature = tz->temperature;
255
256 status =
257 acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
258 if (ACPI_FAILURE(status))
259 return -ENODEV;
260
261 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
262 tz->temperature));
263
264 return 0;
265 }
266
267 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
268 {
269 acpi_status status = AE_OK;
270
271
272 if (!tz)
273 return -EINVAL;
274
275 status =
276 acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
277 &tz->polling_frequency);
278 if (ACPI_FAILURE(status))
279 return -ENODEV;
280
281 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
282 tz->polling_frequency));
283
284 return 0;
285 }
286
287 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
288 {
289
290 if (!tz)
291 return -EINVAL;
292
293 tz->polling_frequency = seconds * 10; /* Convert value to deci-seconds */
294
295 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
296 "Polling frequency set to %lu seconds\n",
297 tz->polling_frequency/10));
298
299 return 0;
300 }
301
302 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
303 {
304 acpi_status status = AE_OK;
305 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
306 struct acpi_object_list arg_list = { 1, &arg0 };
307 acpi_handle handle = NULL;
308
309
310 if (!tz)
311 return -EINVAL;
312
313 status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
314 if (ACPI_FAILURE(status)) {
315 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
316 return -ENODEV;
317 }
318
319 arg0.integer.value = mode;
320
321 status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
322 if (ACPI_FAILURE(status))
323 return -ENODEV;
324
325 return 0;
326 }
327
328 #define ACPI_TRIPS_CRITICAL 0x01
329 #define ACPI_TRIPS_HOT 0x02
330 #define ACPI_TRIPS_PASSIVE 0x04
331 #define ACPI_TRIPS_ACTIVE 0x08
332 #define ACPI_TRIPS_DEVICES 0x10
333
334 #define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
335 #define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
336
337 #define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
338 ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
339 ACPI_TRIPS_DEVICES)
340
341 /*
342 * This exception is thrown out in two cases:
343 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
344 * when re-evaluating the AML code.
345 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
346 * We need to re-bind the cooling devices of a thermal zone when this occurs.
347 */
348 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
349 do { \
350 if (flags != ACPI_TRIPS_INIT) \
351 ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
352 "ACPI thermal trip point %s changed\n" \
353 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
354 } while (0)
355
356 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
357 {
358 acpi_status status = AE_OK;
359 struct acpi_handle_list devices;
360 int valid = 0;
361 int i;
362
363 /* Critical Shutdown (required) */
364 if (flag & ACPI_TRIPS_CRITICAL) {
365 status = acpi_evaluate_integer(tz->device->handle,
366 "_CRT", NULL, &tz->trips.critical.temperature);
367 /*
368 * Treat freezing temperatures as invalid as well; some
369 * BIOSes return really low values and cause reboots at startup.
370 * Below zero (Celcius) values clearly aren't right for sure..
371 * ... so lets discard those as invalid.
372 */
373 if (ACPI_FAILURE(status) ||
374 tz->trips.critical.temperature <= 2732) {
375 tz->trips.critical.flags.valid = 0;
376 ACPI_EXCEPTION((AE_INFO, status,
377 "No or invalid critical threshold"));
378 return -ENODEV;
379 } else {
380 tz->trips.critical.flags.valid = 1;
381 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
382 "Found critical threshold [%lu]\n",
383 tz->trips.critical.temperature));
384 }
385 if (tz->trips.critical.flags.valid == 1) {
386 if (crt == -1) {
387 tz->trips.critical.flags.valid = 0;
388 } else if (crt > 0) {
389 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
390 /*
391 * Allow override critical threshold
392 */
393 if (crt_k > tz->trips.critical.temperature)
394 printk(KERN_WARNING PREFIX
395 "Critical threshold %d C\n", crt);
396 tz->trips.critical.temperature = crt_k;
397 }
398 }
399 }
400
401 /* Critical Sleep (optional) */
402 if (flag & ACPI_TRIPS_HOT) {
403 status = acpi_evaluate_integer(tz->device->handle,
404 "_HOT", NULL, &tz->trips.hot.temperature);
405 if (ACPI_FAILURE(status)) {
406 tz->trips.hot.flags.valid = 0;
407 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
408 "No hot threshold\n"));
409 } else {
410 tz->trips.hot.flags.valid = 1;
411 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
412 "Found hot threshold [%lu]\n",
413 tz->trips.critical.temperature));
414 }
415 }
416
417 /* Passive (optional) */
418 if (flag & ACPI_TRIPS_PASSIVE) {
419 valid = tz->trips.passive.flags.valid;
420 if (psv == -1) {
421 status = AE_SUPPORT;
422 } else if (psv > 0) {
423 tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
424 status = AE_OK;
425 } else {
426 status = acpi_evaluate_integer(tz->device->handle,
427 "_PSV", NULL, &tz->trips.passive.temperature);
428 }
429
430 if (ACPI_FAILURE(status))
431 tz->trips.passive.flags.valid = 0;
432 else {
433 tz->trips.passive.flags.valid = 1;
434 if (flag == ACPI_TRIPS_INIT) {
435 status = acpi_evaluate_integer(
436 tz->device->handle, "_TC1",
437 NULL, &tz->trips.passive.tc1);
438 if (ACPI_FAILURE(status))
439 tz->trips.passive.flags.valid = 0;
440 status = acpi_evaluate_integer(
441 tz->device->handle, "_TC2",
442 NULL, &tz->trips.passive.tc2);
443 if (ACPI_FAILURE(status))
444 tz->trips.passive.flags.valid = 0;
445 status = acpi_evaluate_integer(
446 tz->device->handle, "_TSP",
447 NULL, &tz->trips.passive.tsp);
448 if (ACPI_FAILURE(status))
449 tz->trips.passive.flags.valid = 0;
450 }
451 }
452 }
453 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
454 memset(&devices, 0, sizeof(struct acpi_handle_list));
455 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
456 NULL, &devices);
457 if (ACPI_FAILURE(status))
458 tz->trips.passive.flags.valid = 0;
459 else
460 tz->trips.passive.flags.valid = 1;
461
462 if (memcmp(&tz->trips.passive.devices, &devices,
463 sizeof(struct acpi_handle_list))) {
464 memcpy(&tz->trips.passive.devices, &devices,
465 sizeof(struct acpi_handle_list));
466 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
467 }
468 }
469 if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
470 if (valid != tz->trips.passive.flags.valid)
471 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
472 }
473
474 /* Active (optional) */
475 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
476 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
477 valid = tz->trips.active[i].flags.valid;
478
479 if (act == -1)
480 break; /* disable all active trip points */
481
482 if (flag & ACPI_TRIPS_ACTIVE) {
483 status = acpi_evaluate_integer(tz->device->handle,
484 name, NULL, &tz->trips.active[i].temperature);
485 if (ACPI_FAILURE(status)) {
486 tz->trips.active[i].flags.valid = 0;
487 if (i == 0)
488 break;
489 if (act <= 0)
490 break;
491 if (i == 1)
492 tz->trips.active[0].temperature =
493 CELSIUS_TO_KELVIN(act);
494 else
495 /*
496 * Don't allow override higher than
497 * the next higher trip point
498 */
499 tz->trips.active[i - 1].temperature =
500 (tz->trips.active[i - 2].temperature <
501 CELSIUS_TO_KELVIN(act) ?
502 tz->trips.active[i - 2].temperature :
503 CELSIUS_TO_KELVIN(act));
504 break;
505 } else
506 tz->trips.active[i].flags.valid = 1;
507 }
508
509 name[2] = 'L';
510 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
511 memset(&devices, 0, sizeof(struct acpi_handle_list));
512 status = acpi_evaluate_reference(tz->device->handle,
513 name, NULL, &devices);
514 if (ACPI_FAILURE(status))
515 tz->trips.active[i].flags.valid = 0;
516 else
517 tz->trips.active[i].flags.valid = 1;
518
519 if (memcmp(&tz->trips.active[i].devices, &devices,
520 sizeof(struct acpi_handle_list))) {
521 memcpy(&tz->trips.active[i].devices, &devices,
522 sizeof(struct acpi_handle_list));
523 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
524 }
525 }
526 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
527 if (valid != tz->trips.active[i].flags.valid)
528 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
529
530 if (!tz->trips.active[i].flags.valid)
531 break;
532 }
533
534 if (flag & ACPI_TRIPS_DEVICES) {
535 memset(&devices, 0, sizeof(struct acpi_handle_list));
536 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
537 NULL, &devices);
538 if (memcmp(&tz->devices, &devices,
539 sizeof(struct acpi_handle_list))) {
540 memcpy(&tz->devices, &devices,
541 sizeof(struct acpi_handle_list));
542 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
543 }
544 }
545
546 return 0;
547 }
548
549 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
550 {
551 return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
552 }
553
554 static int acpi_thermal_critical(struct acpi_thermal *tz)
555 {
556 if (!tz || !tz->trips.critical.flags.valid)
557 return -EINVAL;
558
559 if (tz->temperature >= tz->trips.critical.temperature) {
560 printk(KERN_WARNING PREFIX "Critical trip point\n");
561 tz->trips.critical.flags.enabled = 1;
562 } else if (tz->trips.critical.flags.enabled)
563 tz->trips.critical.flags.enabled = 0;
564
565 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
566 tz->trips.critical.flags.enabled);
567 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
568 tz->device->dev.bus_id,
569 ACPI_THERMAL_NOTIFY_CRITICAL,
570 tz->trips.critical.flags.enabled);
571
572 /* take no action if nocrt is set */
573 if(!nocrt) {
574 printk(KERN_EMERG
575 "Critical temperature reached (%ld C), shutting down.\n",
576 KELVIN_TO_CELSIUS(tz->temperature));
577 orderly_poweroff(true);
578 }
579
580 return 0;
581 }
582
583 static int acpi_thermal_hot(struct acpi_thermal *tz)
584 {
585 if (!tz || !tz->trips.hot.flags.valid)
586 return -EINVAL;
587
588 if (tz->temperature >= tz->trips.hot.temperature) {
589 printk(KERN_WARNING PREFIX "Hot trip point\n");
590 tz->trips.hot.flags.enabled = 1;
591 } else if (tz->trips.hot.flags.enabled)
592 tz->trips.hot.flags.enabled = 0;
593
594 acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
595 tz->trips.hot.flags.enabled);
596 acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
597 tz->device->dev.bus_id,
598 ACPI_THERMAL_NOTIFY_HOT,
599 tz->trips.hot.flags.enabled);
600
601 /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
602
603 return 0;
604 }
605
606 static void acpi_thermal_passive(struct acpi_thermal *tz)
607 {
608 int result = 1;
609 struct acpi_thermal_passive *passive = NULL;
610 int trend = 0;
611 int i = 0;
612
613
614 if (!tz || !tz->trips.passive.flags.valid)
615 return;
616
617 passive = &(tz->trips.passive);
618
619 /*
620 * Above Trip?
621 * -----------
622 * Calculate the thermal trend (using the passive cooling equation)
623 * and modify the performance limit for all passive cooling devices
624 * accordingly. Note that we assume symmetry.
625 */
626 if (tz->temperature >= passive->temperature) {
627 trend =
628 (passive->tc1 * (tz->temperature - tz->last_temperature)) +
629 (passive->tc2 * (tz->temperature - passive->temperature));
630 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
631 "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
632 trend, passive->tc1, tz->temperature,
633 tz->last_temperature, passive->tc2,
634 tz->temperature, passive->temperature));
635 passive->flags.enabled = 1;
636 /* Heating up? */
637 if (trend > 0)
638 for (i = 0; i < passive->devices.count; i++)
639 acpi_processor_set_thermal_limit(passive->
640 devices.
641 handles[i],
642 ACPI_PROCESSOR_LIMIT_INCREMENT);
643 /* Cooling off? */
644 else if (trend < 0) {
645 for (i = 0; i < passive->devices.count; i++)
646 /*
647 * assume that we are on highest
648 * freq/lowest thrott and can leave
649 * passive mode, even in error case
650 */
651 if (!acpi_processor_set_thermal_limit
652 (passive->devices.handles[i],
653 ACPI_PROCESSOR_LIMIT_DECREMENT))
654 result = 0;
655 /*
656 * Leave cooling mode, even if the temp might
657 * higher than trip point This is because some
658 * machines might have long thermal polling
659 * frequencies (tsp) defined. We will fall back
660 * into passive mode in next cycle (probably quicker)
661 */
662 if (result) {
663 passive->flags.enabled = 0;
664 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
665 "Disabling passive cooling, still above threshold,"
666 " but we are cooling down\n"));
667 }
668 }
669 return;
670 }
671
672 /*
673 * Below Trip?
674 * -----------
675 * Implement passive cooling hysteresis to slowly increase performance
676 * and avoid thrashing around the passive trip point. Note that we
677 * assume symmetry.
678 */
679 if (!passive->flags.enabled)
680 return;
681 for (i = 0; i < passive->devices.count; i++)
682 if (!acpi_processor_set_thermal_limit
683 (passive->devices.handles[i],
684 ACPI_PROCESSOR_LIMIT_DECREMENT))
685 result = 0;
686 if (result) {
687 passive->flags.enabled = 0;
688 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
689 "Disabling passive cooling (zone is cool)\n"));
690 }
691 }
692
693 static void acpi_thermal_active(struct acpi_thermal *tz)
694 {
695 int result = 0;
696 struct acpi_thermal_active *active = NULL;
697 int i = 0;
698 int j = 0;
699 unsigned long maxtemp = 0;
700
701
702 if (!tz)
703 return;
704
705 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
706 active = &(tz->trips.active[i]);
707 if (!active || !active->flags.valid)
708 break;
709 if (tz->temperature >= active->temperature) {
710 /*
711 * Above Threshold?
712 * ----------------
713 * If not already enabled, turn ON all cooling devices
714 * associated with this active threshold.
715 */
716 if (active->temperature > maxtemp)
717 tz->state.active_index = i;
718 maxtemp = active->temperature;
719 if (active->flags.enabled)
720 continue;
721 for (j = 0; j < active->devices.count; j++) {
722 result =
723 acpi_bus_set_power(active->devices.
724 handles[j],
725 ACPI_STATE_D0);
726 if (result) {
727 printk(KERN_WARNING PREFIX
728 "Unable to turn cooling device [%p] 'on'\n",
729 active->devices.
730 handles[j]);
731 continue;
732 }
733 active->flags.enabled = 1;
734 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
735 "Cooling device [%p] now 'on'\n",
736 active->devices.handles[j]));
737 }
738 continue;
739 }
740 if (!active->flags.enabled)
741 continue;
742 /*
743 * Below Threshold?
744 * ----------------
745 * Turn OFF all cooling devices associated with this
746 * threshold.
747 */
748 for (j = 0; j < active->devices.count; j++) {
749 result = acpi_bus_set_power(active->devices.handles[j],
750 ACPI_STATE_D3);
751 if (result) {
752 printk(KERN_WARNING PREFIX
753 "Unable to turn cooling device [%p] 'off'\n",
754 active->devices.handles[j]);
755 continue;
756 }
757 active->flags.enabled = 0;
758 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
759 "Cooling device [%p] now 'off'\n",
760 active->devices.handles[j]));
761 }
762 }
763 }
764
765 static void acpi_thermal_check(void *context);
766
767 static void acpi_thermal_run(unsigned long data)
768 {
769 struct acpi_thermal *tz = (struct acpi_thermal *)data;
770 if (!tz->zombie)
771 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
772 }
773
774 static void acpi_thermal_active_off(void *data)
775 {
776 int result = 0;
777 struct acpi_thermal *tz = data;
778 int i = 0;
779 int j = 0;
780 struct acpi_thermal_active *active = NULL;
781
782 if (!tz) {
783 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
784 return;
785 }
786
787 result = acpi_thermal_get_temperature(tz);
788 if (result)
789 return;
790
791 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
792 active = &(tz->trips.active[i]);
793 if (!active || !active->flags.valid)
794 break;
795 if (tz->temperature >= active->temperature) {
796 /*
797 * If the thermal temperature is greater than the
798 * active threshod, unnecessary to turn off the
799 * the active cooling device.
800 */
801 continue;
802 }
803 /*
804 * Below Threshold?
805 * ----------------
806 * Turn OFF all cooling devices associated with this
807 * threshold.
808 */
809 for (j = 0; j < active->devices.count; j++)
810 result = acpi_bus_set_power(active->devices.handles[j],
811 ACPI_STATE_D3);
812 }
813 }
814
815 static void acpi_thermal_check(void *data)
816 {
817 int result = 0;
818 struct acpi_thermal *tz = data;
819 unsigned long sleep_time = 0;
820 unsigned long timeout_jiffies = 0;
821 int i = 0;
822 struct acpi_thermal_state state;
823
824
825 if (!tz) {
826 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
827 return;
828 }
829
830 /* Check if someone else is already running */
831 if (!mutex_trylock(&tz->lock))
832 return;
833
834 state = tz->state;
835
836 result = acpi_thermal_get_temperature(tz);
837 if (result)
838 goto unlock;
839
840 if (!tz->tz_enabled)
841 goto unlock;
842
843 memset(&tz->state, 0, sizeof(tz->state));
844
845 /*
846 * Check Trip Points
847 * -----------------
848 * Compare the current temperature to the trip point values to see
849 * if we've entered one of the thermal policy states. Note that
850 * this function determines when a state is entered, but the
851 * individual policy decides when it is exited (e.g. hysteresis).
852 */
853 if (tz->trips.critical.flags.valid)
854 state.critical |=
855 (tz->temperature >= tz->trips.critical.temperature);
856 if (tz->trips.hot.flags.valid)
857 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
858 if (tz->trips.passive.flags.valid)
859 state.passive |=
860 (tz->temperature >= tz->trips.passive.temperature);
861 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
862 if (tz->trips.active[i].flags.valid)
863 state.active |=
864 (tz->temperature >=
865 tz->trips.active[i].temperature);
866
867 /*
868 * Invoke Policy
869 * -------------
870 * Separated from the above check to allow individual policy to
871 * determine when to exit a given state.
872 */
873 if (state.critical)
874 acpi_thermal_critical(tz);
875 if (state.hot)
876 acpi_thermal_hot(tz);
877 if (state.passive)
878 acpi_thermal_passive(tz);
879 if (state.active)
880 acpi_thermal_active(tz);
881
882 /*
883 * Calculate State
884 * ---------------
885 * Again, separated from the above two to allow independent policy
886 * decisions.
887 */
888 tz->state.critical = tz->trips.critical.flags.enabled;
889 tz->state.hot = tz->trips.hot.flags.enabled;
890 tz->state.passive = tz->trips.passive.flags.enabled;
891 tz->state.active = 0;
892 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
893 tz->state.active |= tz->trips.active[i].flags.enabled;
894
895 /*
896 * Calculate Sleep Time
897 * --------------------
898 * If we're in the passive state, use _TSP's value. Otherwise
899 * use the default polling frequency (e.g. _TZP). If no polling
900 * frequency is specified then we'll wait forever (at least until
901 * a thermal event occurs). Note that _TSP and _TZD values are
902 * given in 1/10th seconds (we must covert to milliseconds).
903 */
904 if (tz->state.passive) {
905 sleep_time = tz->trips.passive.tsp * 100;
906 timeout_jiffies = jiffies + (HZ * sleep_time) / 1000;
907 } else if (tz->polling_frequency > 0) {
908 sleep_time = tz->polling_frequency * 100;
909 timeout_jiffies = round_jiffies(jiffies + (HZ * sleep_time) / 1000);
910 }
911
912 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
913 tz->name, tz->temperature, sleep_time));
914
915 /*
916 * Schedule Next Poll
917 * ------------------
918 */
919 if (!sleep_time) {
920 if (timer_pending(&(tz->timer)))
921 del_timer(&(tz->timer));
922 } else {
923 if (timer_pending(&(tz->timer)))
924 mod_timer(&(tz->timer), timeout_jiffies);
925 else {
926 tz->timer.data = (unsigned long)tz;
927 tz->timer.function = acpi_thermal_run;
928 tz->timer.expires = timeout_jiffies;
929 add_timer(&(tz->timer));
930 }
931 }
932 unlock:
933 mutex_unlock(&tz->lock);
934 }
935
936 /* sys I/F for generic thermal sysfs support */
937 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
938
939 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
940 {
941 struct acpi_thermal *tz = thermal->devdata;
942 int result;
943
944 if (!tz)
945 return -EINVAL;
946
947 result = acpi_thermal_get_temperature(tz);
948 if (result)
949 return result;
950
951 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature));
952 }
953
954 static const char enabled[] = "kernel";
955 static const char disabled[] = "user";
956 static int thermal_get_mode(struct thermal_zone_device *thermal,
957 char *buf)
958 {
959 struct acpi_thermal *tz = thermal->devdata;
960
961 if (!tz)
962 return -EINVAL;
963
964 return sprintf(buf, "%s\n", tz->tz_enabled ?
965 enabled : disabled);
966 }
967
968 static int thermal_set_mode(struct thermal_zone_device *thermal,
969 const char *buf)
970 {
971 struct acpi_thermal *tz = thermal->devdata;
972 int enable;
973
974 if (!tz)
975 return -EINVAL;
976
977 /*
978 * enable/disable thermal management from ACPI thermal driver
979 */
980 if (!strncmp(buf, enabled, sizeof enabled - 1))
981 enable = 1;
982 else if (!strncmp(buf, disabled, sizeof disabled - 1))
983 enable = 0;
984 else
985 return -EINVAL;
986
987 if (enable != tz->tz_enabled) {
988 tz->tz_enabled = enable;
989 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
990 "%s ACPI thermal control\n",
991 tz->tz_enabled ? enabled : disabled));
992 acpi_thermal_check(tz);
993 }
994 return 0;
995 }
996
997 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
998 int trip, char *buf)
999 {
1000 struct acpi_thermal *tz = thermal->devdata;
1001 int i;
1002
1003 if (!tz || trip < 0)
1004 return -EINVAL;
1005
1006 if (tz->trips.critical.flags.valid) {
1007 if (!trip)
1008 return sprintf(buf, "critical\n");
1009 trip--;
1010 }
1011
1012 if (tz->trips.hot.flags.valid) {
1013 if (!trip)
1014 return sprintf(buf, "hot\n");
1015 trip--;
1016 }
1017
1018 if (tz->trips.passive.flags.valid) {
1019 if (!trip)
1020 return sprintf(buf, "passive\n");
1021 trip--;
1022 }
1023
1024 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1025 tz->trips.active[i].flags.valid; i++) {
1026 if (!trip)
1027 return sprintf(buf, "active%d\n", i);
1028 trip--;
1029 }
1030
1031 return -EINVAL;
1032 }
1033
1034 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
1035 int trip, char *buf)
1036 {
1037 struct acpi_thermal *tz = thermal->devdata;
1038 int i;
1039
1040 if (!tz || trip < 0)
1041 return -EINVAL;
1042
1043 if (tz->trips.critical.flags.valid) {
1044 if (!trip)
1045 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1046 tz->trips.critical.temperature));
1047 trip--;
1048 }
1049
1050 if (tz->trips.hot.flags.valid) {
1051 if (!trip)
1052 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1053 tz->trips.hot.temperature));
1054 trip--;
1055 }
1056
1057 if (tz->trips.passive.flags.valid) {
1058 if (!trip)
1059 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1060 tz->trips.passive.temperature));
1061 trip--;
1062 }
1063
1064 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1065 tz->trips.active[i].flags.valid; i++) {
1066 if (!trip)
1067 return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1068 tz->trips.active[i].temperature));
1069 trip--;
1070 }
1071
1072 return -EINVAL;
1073 }
1074
1075 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
1076 unsigned long *temperature) {
1077 struct acpi_thermal *tz = thermal->devdata;
1078
1079 if (tz->trips.critical.flags.valid) {
1080 *temperature = KELVIN_TO_MILLICELSIUS(
1081 tz->trips.critical.temperature);
1082 return 0;
1083 } else
1084 return -EINVAL;
1085 }
1086
1087 typedef int (*cb)(struct thermal_zone_device *, int,
1088 struct thermal_cooling_device *);
1089 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
1090 struct thermal_cooling_device *cdev,
1091 cb action)
1092 {
1093 struct acpi_device *device = cdev->devdata;
1094 struct acpi_thermal *tz = thermal->devdata;
1095 struct acpi_device *dev;
1096 acpi_status status;
1097 acpi_handle handle;
1098 int i;
1099 int j;
1100 int trip = -1;
1101 int result = 0;
1102
1103 if (tz->trips.critical.flags.valid)
1104 trip++;
1105
1106 if (tz->trips.hot.flags.valid)
1107 trip++;
1108
1109 if (tz->trips.passive.flags.valid) {
1110 trip++;
1111 for (i = 0; i < tz->trips.passive.devices.count;
1112 i++) {
1113 handle = tz->trips.passive.devices.handles[i];
1114 status = acpi_bus_get_device(handle, &dev);
1115 if (ACPI_SUCCESS(status) && (dev == device)) {
1116 result = action(thermal, trip, cdev);
1117 if (result)
1118 goto failed;
1119 }
1120 }
1121 }
1122
1123 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1124 if (!tz->trips.active[i].flags.valid)
1125 break;
1126 trip++;
1127 for (j = 0;
1128 j < tz->trips.active[i].devices.count;
1129 j++) {
1130 handle = tz->trips.active[i].devices.handles[j];
1131 status = acpi_bus_get_device(handle, &dev);
1132 if (ACPI_SUCCESS(status) && (dev == device)) {
1133 result = action(thermal, trip, cdev);
1134 if (result)
1135 goto failed;
1136 }
1137 }
1138 }
1139
1140 for (i = 0; i < tz->devices.count; i++) {
1141 handle = tz->devices.handles[i];
1142 status = acpi_bus_get_device(handle, &dev);
1143 if (ACPI_SUCCESS(status) && (dev == device)) {
1144 result = action(thermal, -1, cdev);
1145 if (result)
1146 goto failed;
1147 }
1148 }
1149
1150 failed:
1151 return result;
1152 }
1153
1154 static int
1155 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1156 struct thermal_cooling_device *cdev)
1157 {
1158 return acpi_thermal_cooling_device_cb(thermal, cdev,
1159 thermal_zone_bind_cooling_device);
1160 }
1161
1162 static int
1163 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
1164 struct thermal_cooling_device *cdev)
1165 {
1166 return acpi_thermal_cooling_device_cb(thermal, cdev,
1167 thermal_zone_unbind_cooling_device);
1168 }
1169
1170 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1171 .bind = acpi_thermal_bind_cooling_device,
1172 .unbind = acpi_thermal_unbind_cooling_device,
1173 .get_temp = thermal_get_temp,
1174 .get_mode = thermal_get_mode,
1175 .set_mode = thermal_set_mode,
1176 .get_trip_type = thermal_get_trip_type,
1177 .get_trip_temp = thermal_get_trip_temp,
1178 .get_crit_temp = thermal_get_crit_temp,
1179 };
1180
1181 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1182 {
1183 int trips = 0;
1184 int result;
1185 acpi_status status;
1186 int i;
1187
1188 if (tz->trips.critical.flags.valid)
1189 trips++;
1190
1191 if (tz->trips.hot.flags.valid)
1192 trips++;
1193
1194 if (tz->trips.passive.flags.valid)
1195 trips++;
1196
1197 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1198 tz->trips.active[i].flags.valid; i++, trips++);
1199 tz->thermal_zone = thermal_zone_device_register("acpitz",
1200 trips, tz, &acpi_thermal_zone_ops);
1201 if (IS_ERR(tz->thermal_zone))
1202 return -ENODEV;
1203
1204 result = sysfs_create_link(&tz->device->dev.kobj,
1205 &tz->thermal_zone->device.kobj, "thermal_zone");
1206 if (result)
1207 return result;
1208
1209 result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1210 &tz->device->dev.kobj, "device");
1211 if (result)
1212 return result;
1213
1214 status = acpi_attach_data(tz->device->handle,
1215 acpi_bus_private_data_handler,
1216 tz->thermal_zone);
1217 if (ACPI_FAILURE(status)) {
1218 printk(KERN_ERR PREFIX
1219 "Error attaching device data\n");
1220 return -ENODEV;
1221 }
1222
1223 tz->tz_enabled = 1;
1224
1225 dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
1226 tz->thermal_zone->id);
1227 return 0;
1228 }
1229
1230 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1231 {
1232 sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1233 sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1234 thermal_zone_device_unregister(tz->thermal_zone);
1235 tz->thermal_zone = NULL;
1236 acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
1237 }
1238
1239
1240 /* --------------------------------------------------------------------------
1241 FS Interface (/proc)
1242 -------------------------------------------------------------------------- */
1243
1244 static struct proc_dir_entry *acpi_thermal_dir;
1245
1246 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1247 {
1248 struct acpi_thermal *tz = seq->private;
1249
1250
1251 if (!tz)
1252 goto end;
1253
1254 seq_puts(seq, "state: ");
1255
1256 if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1257 && !tz->state.active)
1258 seq_puts(seq, "ok\n");
1259 else {
1260 if (tz->state.critical)
1261 seq_puts(seq, "critical ");
1262 if (tz->state.hot)
1263 seq_puts(seq, "hot ");
1264 if (tz->state.passive)
1265 seq_puts(seq, "passive ");
1266 if (tz->state.active)
1267 seq_printf(seq, "active[%d]", tz->state.active_index);
1268 seq_puts(seq, "\n");
1269 }
1270
1271 end:
1272 return 0;
1273 }
1274
1275 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1276 {
1277 return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1278 }
1279
1280 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1281 {
1282 int result = 0;
1283 struct acpi_thermal *tz = seq->private;
1284
1285
1286 if (!tz)
1287 goto end;
1288
1289 result = acpi_thermal_get_temperature(tz);
1290 if (result)
1291 goto end;
1292
1293 seq_printf(seq, "temperature: %ld C\n",
1294 KELVIN_TO_CELSIUS(tz->temperature));
1295
1296 end:
1297 return 0;
1298 }
1299
1300 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1301 {
1302 return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1303 }
1304
1305 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1306 {
1307 struct acpi_thermal *tz = seq->private;
1308 struct acpi_device *device;
1309 acpi_status status;
1310
1311 int i = 0;
1312 int j = 0;
1313
1314
1315 if (!tz)
1316 goto end;
1317
1318 if (tz->trips.critical.flags.valid)
1319 seq_printf(seq, "critical (S5): %ld C%s",
1320 KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1321 nocrt ? " <disabled>\n" : "\n");
1322
1323 if (tz->trips.hot.flags.valid)
1324 seq_printf(seq, "hot (S4): %ld C%s",
1325 KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1326 nocrt ? " <disabled>\n" : "\n");
1327
1328 if (tz->trips.passive.flags.valid) {
1329 seq_printf(seq,
1330 "passive: %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1331 KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1332 tz->trips.passive.tc1, tz->trips.passive.tc2,
1333 tz->trips.passive.tsp);
1334 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1335 status = acpi_bus_get_device(tz->trips.passive.devices.
1336 handles[j], &device);
1337 seq_printf(seq, "%4.4s ", status ? "" :
1338 acpi_device_bid(device));
1339 }
1340 seq_puts(seq, "\n");
1341 }
1342
1343 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1344 if (!(tz->trips.active[i].flags.valid))
1345 break;
1346 seq_printf(seq, "active[%d]: %ld C: devices=",
1347 i,
1348 KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1349 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1350 status = acpi_bus_get_device(tz->trips.active[i].
1351 devices.handles[j],
1352 &device);
1353 seq_printf(seq, "%4.4s ", status ? "" :
1354 acpi_device_bid(device));
1355 }
1356 seq_puts(seq, "\n");
1357 }
1358
1359 end:
1360 return 0;
1361 }
1362
1363 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1364 {
1365 return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1366 }
1367
1368 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1369 {
1370 struct acpi_thermal *tz = seq->private;
1371
1372
1373 if (!tz)
1374 goto end;
1375
1376 if (!tz->flags.cooling_mode)
1377 seq_puts(seq, "<setting not supported>\n");
1378 else
1379 seq_puts(seq, "0 - Active; 1 - Passive\n");
1380
1381 end:
1382 return 0;
1383 }
1384
1385 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1386 {
1387 return single_open(file, acpi_thermal_cooling_seq_show,
1388 PDE(inode)->data);
1389 }
1390
1391 static ssize_t
1392 acpi_thermal_write_cooling_mode(struct file *file,
1393 const char __user * buffer,
1394 size_t count, loff_t * ppos)
1395 {
1396 struct seq_file *m = file->private_data;
1397 struct acpi_thermal *tz = m->private;
1398 int result = 0;
1399 char mode_string[12] = { '\0' };
1400
1401
1402 if (!tz || (count > sizeof(mode_string) - 1))
1403 return -EINVAL;
1404
1405 if (!tz->flags.cooling_mode)
1406 return -ENODEV;
1407
1408 if (copy_from_user(mode_string, buffer, count))
1409 return -EFAULT;
1410
1411 mode_string[count] = '\0';
1412
1413 result = acpi_thermal_set_cooling_mode(tz,
1414 simple_strtoul(mode_string, NULL,
1415 0));
1416 if (result)
1417 return result;
1418
1419 acpi_thermal_check(tz);
1420
1421 return count;
1422 }
1423
1424 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1425 {
1426 struct acpi_thermal *tz = seq->private;
1427
1428
1429 if (!tz)
1430 goto end;
1431
1432 if (!tz->polling_frequency) {
1433 seq_puts(seq, "<polling disabled>\n");
1434 goto end;
1435 }
1436
1437 seq_printf(seq, "polling frequency: %lu seconds\n",
1438 (tz->polling_frequency / 10));
1439
1440 end:
1441 return 0;
1442 }
1443
1444 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1445 {
1446 return single_open(file, acpi_thermal_polling_seq_show,
1447 PDE(inode)->data);
1448 }
1449
1450 static ssize_t
1451 acpi_thermal_write_polling(struct file *file,
1452 const char __user * buffer,
1453 size_t count, loff_t * ppos)
1454 {
1455 struct seq_file *m = file->private_data;
1456 struct acpi_thermal *tz = m->private;
1457 int result = 0;
1458 char polling_string[12] = { '\0' };
1459 int seconds = 0;
1460
1461
1462 if (!tz || (count > sizeof(polling_string) - 1))
1463 return -EINVAL;
1464
1465 if (copy_from_user(polling_string, buffer, count))
1466 return -EFAULT;
1467
1468 polling_string[count] = '\0';
1469
1470 seconds = simple_strtoul(polling_string, NULL, 0);
1471
1472 result = acpi_thermal_set_polling(tz, seconds);
1473 if (result)
1474 return result;
1475
1476 acpi_thermal_check(tz);
1477
1478 return count;
1479 }
1480
1481 static int acpi_thermal_add_fs(struct acpi_device *device)
1482 {
1483 struct proc_dir_entry *entry = NULL;
1484
1485
1486 if (!acpi_device_dir(device)) {
1487 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1488 acpi_thermal_dir);
1489 if (!acpi_device_dir(device))
1490 return -ENODEV;
1491 acpi_device_dir(device)->owner = THIS_MODULE;
1492 }
1493
1494 /* 'state' [R] */
1495 entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1496 S_IRUGO, acpi_device_dir(device),
1497 &acpi_thermal_state_fops,
1498 acpi_driver_data(device));
1499 if (!entry)
1500 return -ENODEV;
1501
1502 /* 'temperature' [R] */
1503 entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1504 S_IRUGO, acpi_device_dir(device),
1505 &acpi_thermal_temp_fops,
1506 acpi_driver_data(device));
1507 if (!entry)
1508 return -ENODEV;
1509
1510 /* 'trip_points' [R] */
1511 entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1512 S_IRUGO,
1513 acpi_device_dir(device),
1514 &acpi_thermal_trip_fops,
1515 acpi_driver_data(device));
1516 if (!entry)
1517 return -ENODEV;
1518
1519 /* 'cooling_mode' [R/W] */
1520 entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1521 S_IFREG | S_IRUGO | S_IWUSR,
1522 acpi_device_dir(device),
1523 &acpi_thermal_cooling_fops,
1524 acpi_driver_data(device));
1525 if (!entry)
1526 return -ENODEV;
1527
1528 /* 'polling_frequency' [R/W] */
1529 entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1530 S_IFREG | S_IRUGO | S_IWUSR,
1531 acpi_device_dir(device),
1532 &acpi_thermal_polling_fops,
1533 acpi_driver_data(device));
1534 if (!entry)
1535 return -ENODEV;
1536 return 0;
1537 }
1538
1539 static int acpi_thermal_remove_fs(struct acpi_device *device)
1540 {
1541
1542 if (acpi_device_dir(device)) {
1543 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1544 acpi_device_dir(device));
1545 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1546 acpi_device_dir(device));
1547 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1548 acpi_device_dir(device));
1549 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1550 acpi_device_dir(device));
1551 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1552 acpi_device_dir(device));
1553 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1554 acpi_device_dir(device) = NULL;
1555 }
1556
1557 return 0;
1558 }
1559
1560 /* --------------------------------------------------------------------------
1561 Driver Interface
1562 -------------------------------------------------------------------------- */
1563
1564 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1565 {
1566 struct acpi_thermal *tz = data;
1567 struct acpi_device *device = NULL;
1568
1569
1570 if (!tz)
1571 return;
1572
1573 device = tz->device;
1574
1575 switch (event) {
1576 case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1577 acpi_thermal_check(tz);
1578 break;
1579 case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1580 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1581 acpi_thermal_check(tz);
1582 acpi_bus_generate_proc_event(device, event, 0);
1583 acpi_bus_generate_netlink_event(device->pnp.device_class,
1584 device->dev.bus_id, event, 0);
1585 break;
1586 case ACPI_THERMAL_NOTIFY_DEVICES:
1587 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1588 acpi_thermal_check(tz);
1589 acpi_bus_generate_proc_event(device, event, 0);
1590 acpi_bus_generate_netlink_event(device->pnp.device_class,
1591 device->dev.bus_id, event, 0);
1592 break;
1593 default:
1594 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1595 "Unsupported event [0x%x]\n", event));
1596 break;
1597 }
1598
1599 return;
1600 }
1601
1602 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1603 {
1604 int result = 0;
1605
1606
1607 if (!tz)
1608 return -EINVAL;
1609
1610 /* Get temperature [_TMP] (required) */
1611 result = acpi_thermal_get_temperature(tz);
1612 if (result)
1613 return result;
1614
1615 /* Get trip points [_CRT, _PSV, etc.] (required) */
1616 result = acpi_thermal_get_trip_points(tz);
1617 if (result)
1618 return result;
1619
1620 /* Set the cooling mode [_SCP] to active cooling (default) */
1621 result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1622 if (!result)
1623 tz->flags.cooling_mode = 1;
1624
1625 /* Get default polling frequency [_TZP] (optional) */
1626 if (tzp)
1627 tz->polling_frequency = tzp;
1628 else
1629 acpi_thermal_get_polling_frequency(tz);
1630
1631 return 0;
1632 }
1633
1634 static int acpi_thermal_add(struct acpi_device *device)
1635 {
1636 int result = 0;
1637 acpi_status status = AE_OK;
1638 struct acpi_thermal *tz = NULL;
1639
1640
1641 if (!device)
1642 return -EINVAL;
1643
1644 tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1645 if (!tz)
1646 return -ENOMEM;
1647
1648 tz->device = device;
1649 strcpy(tz->name, device->pnp.bus_id);
1650 strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1651 strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1652 device->driver_data = tz;
1653 mutex_init(&tz->lock);
1654
1655
1656 result = acpi_thermal_get_info(tz);
1657 if (result)
1658 goto free_memory;
1659
1660 result = acpi_thermal_register_thermal_zone(tz);
1661 if (result)
1662 goto free_memory;
1663
1664 result = acpi_thermal_add_fs(device);
1665 if (result)
1666 goto unregister_thermal_zone;
1667
1668 init_timer(&tz->timer);
1669
1670 acpi_thermal_active_off(tz);
1671
1672 acpi_thermal_check(tz);
1673
1674 status = acpi_install_notify_handler(device->handle,
1675 ACPI_DEVICE_NOTIFY,
1676 acpi_thermal_notify, tz);
1677 if (ACPI_FAILURE(status)) {
1678 result = -ENODEV;
1679 goto remove_fs;
1680 }
1681
1682 printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1683 acpi_device_name(device), acpi_device_bid(device),
1684 KELVIN_TO_CELSIUS(tz->temperature));
1685 goto end;
1686
1687 remove_fs:
1688 acpi_thermal_remove_fs(device);
1689 unregister_thermal_zone:
1690 thermal_zone_device_unregister(tz->thermal_zone);
1691 free_memory:
1692 kfree(tz);
1693 end:
1694 return result;
1695 }
1696
1697 static int acpi_thermal_remove(struct acpi_device *device, int type)
1698 {
1699 acpi_status status = AE_OK;
1700 struct acpi_thermal *tz = NULL;
1701
1702
1703 if (!device || !acpi_driver_data(device))
1704 return -EINVAL;
1705
1706 tz = acpi_driver_data(device);
1707
1708 /* avoid timer adding new defer task */
1709 tz->zombie = 1;
1710 /* wait for running timer (on other CPUs) finish */
1711 del_timer_sync(&(tz->timer));
1712 /* synchronize deferred task */
1713 acpi_os_wait_events_complete(NULL);
1714 /* deferred task may reinsert timer */
1715 del_timer_sync(&(tz->timer));
1716
1717 status = acpi_remove_notify_handler(device->handle,
1718 ACPI_DEVICE_NOTIFY,
1719 acpi_thermal_notify);
1720
1721 /* Terminate policy */
1722 if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1723 tz->trips.passive.flags.enabled = 0;
1724 acpi_thermal_passive(tz);
1725 }
1726 if (tz->trips.active[0].flags.valid
1727 && tz->trips.active[0].flags.enabled) {
1728 tz->trips.active[0].flags.enabled = 0;
1729 acpi_thermal_active(tz);
1730 }
1731
1732 acpi_thermal_remove_fs(device);
1733 acpi_thermal_unregister_thermal_zone(tz);
1734 mutex_destroy(&tz->lock);
1735 kfree(tz);
1736 return 0;
1737 }
1738
1739 static int acpi_thermal_resume(struct acpi_device *device)
1740 {
1741 struct acpi_thermal *tz = NULL;
1742 int i, j, power_state, result;
1743
1744
1745 if (!device || !acpi_driver_data(device))
1746 return -EINVAL;
1747
1748 tz = acpi_driver_data(device);
1749
1750 for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1751 if (!(&tz->trips.active[i]))
1752 break;
1753 if (!tz->trips.active[i].flags.valid)
1754 break;
1755 tz->trips.active[i].flags.enabled = 1;
1756 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1757 result = acpi_bus_get_power(tz->trips.active[i].devices.
1758 handles[j], &power_state);
1759 if (result || (power_state != ACPI_STATE_D0)) {
1760 tz->trips.active[i].flags.enabled = 0;
1761 break;
1762 }
1763 }
1764 tz->state.active |= tz->trips.active[i].flags.enabled;
1765 }
1766
1767 acpi_thermal_check(tz);
1768
1769 return AE_OK;
1770 }
1771
1772 static int thermal_act(const struct dmi_system_id *d) {
1773
1774 if (act == 0) {
1775 printk(KERN_NOTICE "ACPI: %s detected: "
1776 "disabling all active thermal trip points\n", d->ident);
1777 act = -1;
1778 }
1779 return 0;
1780 }
1781 static int thermal_nocrt(const struct dmi_system_id *d) {
1782
1783 printk(KERN_NOTICE "ACPI: %s detected: "
1784 "disabling all critical thermal trip point actions.\n", d->ident);
1785 nocrt = 1;
1786 return 0;
1787 }
1788 static int thermal_tzp(const struct dmi_system_id *d) {
1789
1790 if (tzp == 0) {
1791 printk(KERN_NOTICE "ACPI: %s detected: "
1792 "enabling thermal zone polling\n", d->ident);
1793 tzp = 300; /* 300 dS = 30 Seconds */
1794 }
1795 return 0;
1796 }
1797 static int thermal_psv(const struct dmi_system_id *d) {
1798
1799 if (psv == 0) {
1800 printk(KERN_NOTICE "ACPI: %s detected: "
1801 "disabling all passive thermal trip points\n", d->ident);
1802 psv = -1;
1803 }
1804 return 0;
1805 }
1806
1807 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1808 /*
1809 * Award BIOS on this AOpen makes thermal control almost worthless.
1810 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1811 */
1812 {
1813 .callback = thermal_act,
1814 .ident = "AOpen i915GMm-HFS",
1815 .matches = {
1816 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1817 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1818 },
1819 },
1820 {
1821 .callback = thermal_psv,
1822 .ident = "AOpen i915GMm-HFS",
1823 .matches = {
1824 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1825 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1826 },
1827 },
1828 {
1829 .callback = thermal_tzp,
1830 .ident = "AOpen i915GMm-HFS",
1831 .matches = {
1832 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1833 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1834 },
1835 },
1836 {
1837 .callback = thermal_nocrt,
1838 .ident = "Gigabyte GA-7ZX",
1839 .matches = {
1840 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1841 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1842 },
1843 },
1844 {}
1845 };
1846
1847 static int __init acpi_thermal_init(void)
1848 {
1849 int result = 0;
1850
1851 dmi_check_system(thermal_dmi_table);
1852
1853 if (off) {
1854 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1855 return -ENODEV;
1856 }
1857 acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1858 if (!acpi_thermal_dir)
1859 return -ENODEV;
1860 acpi_thermal_dir->owner = THIS_MODULE;
1861
1862 result = acpi_bus_register_driver(&acpi_thermal_driver);
1863 if (result < 0) {
1864 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1865 return -ENODEV;
1866 }
1867
1868 return 0;
1869 }
1870
1871 static void __exit acpi_thermal_exit(void)
1872 {
1873
1874 acpi_bus_unregister_driver(&acpi_thermal_driver);
1875
1876 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1877
1878 return;
1879 }
1880
1881 module_init(acpi_thermal_init);
1882 module_exit(acpi_thermal_exit);
Support for the Chinese Samsung S3C2440 based development boards