ACPI: consolidate ACPI_*_COMPONENT definitions in acpi_drivers.h
[linux-3.10.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_CLASS              "thermal_zone"
51 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
52 #define ACPI_THERMAL_FILE_STATE         "state"
53 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
54 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
55 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
56 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
57 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
58 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
59 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
60 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
61 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
62 #define ACPI_THERMAL_MODE_ACTIVE        0x00
63
64 #define ACPI_THERMAL_MAX_ACTIVE 10
65 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
66
67 #define _COMPONENT              ACPI_THERMAL_COMPONENT
68 ACPI_MODULE_NAME("thermal");
69
70 MODULE_AUTHOR("Paul Diefenbaugh");
71 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
72 MODULE_LICENSE("GPL");
73
74 static int act;
75 module_param(act, int, 0644);
76 MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
77
78 static int crt;
79 module_param(crt, int, 0644);
80 MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
81
82 static int tzp;
83 module_param(tzp, int, 0444);
84 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
85
86 static int nocrt;
87 module_param(nocrt, int, 0);
88 MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
89
90 static int off;
91 module_param(off, int, 0);
92 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
93
94 static int psv;
95 module_param(psv, int, 0644);
96 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
97
98 static int acpi_thermal_add(struct acpi_device *device);
99 static int acpi_thermal_remove(struct acpi_device *device, int type);
100 static int acpi_thermal_resume(struct acpi_device *device);
101 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
102 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
103 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
104 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
105 static ssize_t acpi_thermal_write_cooling_mode(struct file *,
106                                                const char __user *, size_t,
107                                                loff_t *);
108 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
109 static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
110                                           size_t, loff_t *);
111
112 static const struct acpi_device_id  thermal_device_ids[] = {
113         {ACPI_THERMAL_HID, 0},
114         {"", 0},
115 };
116 MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
117
118 static struct acpi_driver acpi_thermal_driver = {
119         .name = "thermal",
120         .class = ACPI_THERMAL_CLASS,
121         .ids = thermal_device_ids,
122         .ops = {
123                 .add = acpi_thermal_add,
124                 .remove = acpi_thermal_remove,
125                 .resume = acpi_thermal_resume,
126                 },
127 };
128
129 struct acpi_thermal_state {
130         u8 critical:1;
131         u8 hot:1;
132         u8 passive:1;
133         u8 active:1;
134         u8 reserved:4;
135         int active_index;
136 };
137
138 struct acpi_thermal_state_flags {
139         u8 valid:1;
140         u8 enabled:1;
141         u8 reserved:6;
142 };
143
144 struct acpi_thermal_critical {
145         struct acpi_thermal_state_flags flags;
146         unsigned long temperature;
147 };
148
149 struct acpi_thermal_hot {
150         struct acpi_thermal_state_flags flags;
151         unsigned long temperature;
152 };
153
154 struct acpi_thermal_passive {
155         struct acpi_thermal_state_flags flags;
156         unsigned long temperature;
157         unsigned long tc1;
158         unsigned long tc2;
159         unsigned long tsp;
160         struct acpi_handle_list devices;
161 };
162
163 struct acpi_thermal_active {
164         struct acpi_thermal_state_flags flags;
165         unsigned long temperature;
166         struct acpi_handle_list devices;
167 };
168
169 struct acpi_thermal_trips {
170         struct acpi_thermal_critical critical;
171         struct acpi_thermal_hot hot;
172         struct acpi_thermal_passive passive;
173         struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
174 };
175
176 struct acpi_thermal_flags {
177         u8 cooling_mode:1;      /* _SCP */
178         u8 devices:1;           /* _TZD */
179         u8 reserved:6;
180 };
181
182 struct acpi_thermal {
183         struct acpi_device * device;
184         acpi_bus_id name;
185         unsigned long temperature;
186         unsigned long last_temperature;
187         unsigned long polling_frequency;
188         volatile u8 zombie;
189         struct acpi_thermal_flags flags;
190         struct acpi_thermal_state state;
191         struct acpi_thermal_trips trips;
192         struct acpi_handle_list devices;
193         struct timer_list timer;
194         struct thermal_zone_device *thermal_zone;
195         int tz_enabled;
196         struct mutex lock;
197 };
198
199 static const struct file_operations acpi_thermal_state_fops = {
200         .owner = THIS_MODULE,
201         .open = acpi_thermal_state_open_fs,
202         .read = seq_read,
203         .llseek = seq_lseek,
204         .release = single_release,
205 };
206
207 static const struct file_operations acpi_thermal_temp_fops = {
208         .owner = THIS_MODULE,
209         .open = acpi_thermal_temp_open_fs,
210         .read = seq_read,
211         .llseek = seq_lseek,
212         .release = single_release,
213 };
214
215 static const struct file_operations acpi_thermal_trip_fops = {
216         .owner = THIS_MODULE,
217         .open = acpi_thermal_trip_open_fs,
218         .read = seq_read,
219         .llseek = seq_lseek,
220         .release = single_release,
221 };
222
223 static const struct file_operations acpi_thermal_cooling_fops = {
224         .owner = THIS_MODULE,
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         .owner = THIS_MODULE,
234         .open = acpi_thermal_polling_open_fs,
235         .read = seq_read,
236         .write = acpi_thermal_write_polling,
237         .llseek = seq_lseek,
238         .release = single_release,
239 };
240
241 /* --------------------------------------------------------------------------
242                              Thermal Zone Management
243    -------------------------------------------------------------------------- */
244
245 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
246 {
247         acpi_status status = AE_OK;
248         unsigned long long tmp;
249
250         if (!tz)
251                 return -EINVAL;
252
253         tz->last_temperature = tz->temperature;
254
255         status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
256         if (ACPI_FAILURE(status))
257                 return -ENODEV;
258
259         tz->temperature = tmp;
260         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
261                           tz->temperature));
262
263         return 0;
264 }
265
266 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
267 {
268         acpi_status status = AE_OK;
269         unsigned long long tmp;
270
271         if (!tz)
272                 return -EINVAL;
273
274         status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
275         if (ACPI_FAILURE(status))
276                 return -ENODEV;
277
278         tz->polling_frequency = tmp;
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         unsigned long long tmp;
358         struct acpi_handle_list devices;
359         int valid = 0;
360         int i;
361
362         /* Critical Shutdown (required) */
363         if (flag & ACPI_TRIPS_CRITICAL) {
364                 status = acpi_evaluate_integer(tz->device->handle,
365                                 "_CRT", NULL, &tmp);
366                 tz->trips.critical.temperature = tmp;
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, &tmp);
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.temperature = tmp;
411                         tz->trips.hot.flags.valid = 1;
412                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
413                                         "Found hot threshold [%lu]\n",
414                                         tz->trips.critical.temperature));
415                 }
416         }
417
418         /* Passive (optional) */
419         if (flag & ACPI_TRIPS_PASSIVE) {
420                 valid = tz->trips.passive.flags.valid;
421                 if (psv == -1) {
422                         status = AE_SUPPORT;
423                 } else if (psv > 0) {
424                         tmp = CELSIUS_TO_KELVIN(psv);
425                         status = AE_OK;
426                 } else {
427                         status = acpi_evaluate_integer(tz->device->handle,
428                                 "_PSV", NULL, &tmp);
429                 }
430
431                 if (ACPI_FAILURE(status))
432                         tz->trips.passive.flags.valid = 0;
433                 else {
434                         tz->trips.passive.temperature = tmp;
435                         tz->trips.passive.flags.valid = 1;
436                         if (flag == ACPI_TRIPS_INIT) {
437                                 status = acpi_evaluate_integer(
438                                                 tz->device->handle, "_TC1",
439                                                 NULL, &tmp);
440                                 if (ACPI_FAILURE(status))
441                                         tz->trips.passive.flags.valid = 0;
442                                 else
443                                         tz->trips.passive.tc1 = tmp;
444                                 status = acpi_evaluate_integer(
445                                                 tz->device->handle, "_TC2",
446                                                 NULL, &tmp);
447                                 if (ACPI_FAILURE(status))
448                                         tz->trips.passive.flags.valid = 0;
449                                 else
450                                         tz->trips.passive.tc2 = tmp;
451                                 status = acpi_evaluate_integer(
452                                                 tz->device->handle, "_TSP",
453                                                 NULL, &tmp);
454                                 if (ACPI_FAILURE(status))
455                                         tz->trips.passive.flags.valid = 0;
456                                 else
457                                         tz->trips.passive.tsp = tmp;
458                         }
459                 }
460         }
461         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
462                 memset(&devices, 0, sizeof(struct acpi_handle_list));
463                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
464                                                         NULL, &devices);
465                 if (ACPI_FAILURE(status))
466                         tz->trips.passive.flags.valid = 0;
467                 else
468                         tz->trips.passive.flags.valid = 1;
469
470                 if (memcmp(&tz->trips.passive.devices, &devices,
471                                 sizeof(struct acpi_handle_list))) {
472                         memcpy(&tz->trips.passive.devices, &devices,
473                                 sizeof(struct acpi_handle_list));
474                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
475                 }
476         }
477         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
478                 if (valid != tz->trips.passive.flags.valid)
479                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
480         }
481
482         /* Active (optional) */
483         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
484                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
485                 valid = tz->trips.active[i].flags.valid;
486
487                 if (act == -1)
488                         break; /* disable all active trip points */
489
490                 if (flag & ACPI_TRIPS_ACTIVE) {
491                         status = acpi_evaluate_integer(tz->device->handle,
492                                                         name, NULL, &tmp);
493                         if (ACPI_FAILURE(status)) {
494                                 tz->trips.active[i].flags.valid = 0;
495                                 if (i == 0)
496                                         break;
497                                 if (act <= 0)
498                                         break;
499                                 if (i == 1)
500                                         tz->trips.active[0].temperature =
501                                                 CELSIUS_TO_KELVIN(act);
502                                 else
503                                         /*
504                                          * Don't allow override higher than
505                                          * the next higher trip point
506                                          */
507                                         tz->trips.active[i - 1].temperature =
508                                                 (tz->trips.active[i - 2].temperature <
509                                                 CELSIUS_TO_KELVIN(act) ?
510                                                 tz->trips.active[i - 2].temperature :
511                                                 CELSIUS_TO_KELVIN(act));
512                                 break;
513                         } else {
514                                 tz->trips.active[i].temperature = tmp;
515                                 tz->trips.active[i].flags.valid = 1;
516                         }
517                 }
518
519                 name[2] = 'L';
520                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
521                         memset(&devices, 0, sizeof(struct acpi_handle_list));
522                         status = acpi_evaluate_reference(tz->device->handle,
523                                                 name, NULL, &devices);
524                         if (ACPI_FAILURE(status))
525                                 tz->trips.active[i].flags.valid = 0;
526                         else
527                                 tz->trips.active[i].flags.valid = 1;
528
529                         if (memcmp(&tz->trips.active[i].devices, &devices,
530                                         sizeof(struct acpi_handle_list))) {
531                                 memcpy(&tz->trips.active[i].devices, &devices,
532                                         sizeof(struct acpi_handle_list));
533                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
534                         }
535                 }
536                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
537                         if (valid != tz->trips.active[i].flags.valid)
538                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
539
540                 if (!tz->trips.active[i].flags.valid)
541                         break;
542         }
543
544         if (flag & ACPI_TRIPS_DEVICES) {
545                 memset(&devices, 0, sizeof(struct acpi_handle_list));
546                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
547                                                 NULL, &devices);
548                 if (memcmp(&tz->devices, &devices,
549                                 sizeof(struct acpi_handle_list))) {
550                         memcpy(&tz->devices, &devices,
551                                 sizeof(struct acpi_handle_list));
552                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
553                 }
554         }
555
556         return 0;
557 }
558
559 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
560 {
561         return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
562 }
563
564 static int acpi_thermal_critical(struct acpi_thermal *tz)
565 {
566         if (!tz || !tz->trips.critical.flags.valid)
567                 return -EINVAL;
568
569         if (tz->temperature >= tz->trips.critical.temperature) {
570                 printk(KERN_WARNING PREFIX "Critical trip point\n");
571                 tz->trips.critical.flags.enabled = 1;
572         } else if (tz->trips.critical.flags.enabled)
573                 tz->trips.critical.flags.enabled = 0;
574
575         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
576                                 tz->trips.critical.flags.enabled);
577         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
578                                           tz->device->dev.bus_id,
579                                           ACPI_THERMAL_NOTIFY_CRITICAL,
580                                           tz->trips.critical.flags.enabled);
581
582         /* take no action if nocrt is set */
583         if(!nocrt) {
584                 printk(KERN_EMERG
585                         "Critical temperature reached (%ld C), shutting down.\n",
586                         KELVIN_TO_CELSIUS(tz->temperature));
587                 orderly_poweroff(true);
588         }
589
590         return 0;
591 }
592
593 static int acpi_thermal_hot(struct acpi_thermal *tz)
594 {
595         if (!tz || !tz->trips.hot.flags.valid)
596                 return -EINVAL;
597
598         if (tz->temperature >= tz->trips.hot.temperature) {
599                 printk(KERN_WARNING PREFIX "Hot trip point\n");
600                 tz->trips.hot.flags.enabled = 1;
601         } else if (tz->trips.hot.flags.enabled)
602                 tz->trips.hot.flags.enabled = 0;
603
604         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
605                                 tz->trips.hot.flags.enabled);
606         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
607                                           tz->device->dev.bus_id,
608                                           ACPI_THERMAL_NOTIFY_HOT,
609                                           tz->trips.hot.flags.enabled);
610
611         /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
612
613         return 0;
614 }
615
616 static void acpi_thermal_passive(struct acpi_thermal *tz)
617 {
618         int result = 1;
619         struct acpi_thermal_passive *passive = NULL;
620         int trend = 0;
621         int i = 0;
622
623
624         if (!tz || !tz->trips.passive.flags.valid)
625                 return;
626
627         passive = &(tz->trips.passive);
628
629         /*
630          * Above Trip?
631          * -----------
632          * Calculate the thermal trend (using the passive cooling equation)
633          * and modify the performance limit for all passive cooling devices
634          * accordingly.  Note that we assume symmetry.
635          */
636         if (tz->temperature >= passive->temperature) {
637                 trend =
638                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
639                     (passive->tc2 * (tz->temperature - passive->temperature));
640                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
641                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
642                                   trend, passive->tc1, tz->temperature,
643                                   tz->last_temperature, passive->tc2,
644                                   tz->temperature, passive->temperature));
645                 passive->flags.enabled = 1;
646                 /* Heating up? */
647                 if (trend > 0)
648                         for (i = 0; i < passive->devices.count; i++)
649                                 acpi_processor_set_thermal_limit(passive->
650                                                                  devices.
651                                                                  handles[i],
652                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
653                 /* Cooling off? */
654                 else if (trend < 0) {
655                         for (i = 0; i < passive->devices.count; i++)
656                                 /*
657                                  * assume that we are on highest
658                                  * freq/lowest thrott and can leave
659                                  * passive mode, even in error case
660                                  */
661                                 if (!acpi_processor_set_thermal_limit
662                                     (passive->devices.handles[i],
663                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
664                                         result = 0;
665                         /*
666                          * Leave cooling mode, even if the temp might
667                          * higher than trip point This is because some
668                          * machines might have long thermal polling
669                          * frequencies (tsp) defined. We will fall back
670                          * into passive mode in next cycle (probably quicker)
671                          */
672                         if (result) {
673                                 passive->flags.enabled = 0;
674                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
675                                                   "Disabling passive cooling, still above threshold,"
676                                                   " but we are cooling down\n"));
677                         }
678                 }
679                 return;
680         }
681
682         /*
683          * Below Trip?
684          * -----------
685          * Implement passive cooling hysteresis to slowly increase performance
686          * and avoid thrashing around the passive trip point.  Note that we
687          * assume symmetry.
688          */
689         if (!passive->flags.enabled)
690                 return;
691         for (i = 0; i < passive->devices.count; i++)
692                 if (!acpi_processor_set_thermal_limit
693                     (passive->devices.handles[i],
694                      ACPI_PROCESSOR_LIMIT_DECREMENT))
695                         result = 0;
696         if (result) {
697                 passive->flags.enabled = 0;
698                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
699                                   "Disabling passive cooling (zone is cool)\n"));
700         }
701 }
702
703 static void acpi_thermal_active(struct acpi_thermal *tz)
704 {
705         int result = 0;
706         struct acpi_thermal_active *active = NULL;
707         int i = 0;
708         int j = 0;
709         unsigned long maxtemp = 0;
710
711
712         if (!tz)
713                 return;
714
715         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
716                 active = &(tz->trips.active[i]);
717                 if (!active || !active->flags.valid)
718                         break;
719                 if (tz->temperature >= active->temperature) {
720                         /*
721                          * Above Threshold?
722                          * ----------------
723                          * If not already enabled, turn ON all cooling devices
724                          * associated with this active threshold.
725                          */
726                         if (active->temperature > maxtemp)
727                                 tz->state.active_index = i;
728                         maxtemp = active->temperature;
729                         if (active->flags.enabled)
730                                 continue;
731                         for (j = 0; j < active->devices.count; j++) {
732                                 result =
733                                     acpi_bus_set_power(active->devices.
734                                                        handles[j],
735                                                        ACPI_STATE_D0);
736                                 if (result) {
737                                         printk(KERN_WARNING PREFIX
738                                                       "Unable to turn cooling device [%p] 'on'\n",
739                                                       active->devices.
740                                                       handles[j]);
741                                         continue;
742                                 }
743                                 active->flags.enabled = 1;
744                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
745                                                   "Cooling device [%p] now 'on'\n",
746                                                   active->devices.handles[j]));
747                         }
748                         continue;
749                 }
750                 if (!active->flags.enabled)
751                         continue;
752                 /*
753                  * Below Threshold?
754                  * ----------------
755                  * Turn OFF all cooling devices associated with this
756                  * threshold.
757                  */
758                 for (j = 0; j < active->devices.count; j++) {
759                         result = acpi_bus_set_power(active->devices.handles[j],
760                                                     ACPI_STATE_D3);
761                         if (result) {
762                                 printk(KERN_WARNING PREFIX
763                                               "Unable to turn cooling device [%p] 'off'\n",
764                                               active->devices.handles[j]);
765                                 continue;
766                         }
767                         active->flags.enabled = 0;
768                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
769                                           "Cooling device [%p] now 'off'\n",
770                                           active->devices.handles[j]));
771                 }
772         }
773 }
774
775 static void acpi_thermal_check(void *context);
776
777 static void acpi_thermal_run(unsigned long data)
778 {
779         struct acpi_thermal *tz = (struct acpi_thermal *)data;
780         if (!tz->zombie)
781                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
782 }
783
784 static void acpi_thermal_active_off(void *data)
785 {
786         int result = 0;
787         struct acpi_thermal *tz = data;
788         int i = 0;
789         int j = 0;
790         struct acpi_thermal_active *active = NULL;
791
792         if (!tz) {
793                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
794                 return;
795         }
796
797         result = acpi_thermal_get_temperature(tz);
798         if (result)
799                 return;
800
801         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
802                 active = &(tz->trips.active[i]);
803                 if (!active || !active->flags.valid)
804                         break;
805                 if (tz->temperature >= active->temperature) {
806                         /*
807                          * If the thermal temperature is greater than the
808                          * active threshod, unnecessary to turn off the
809                          * the active cooling device.
810                          */
811                         continue;
812                 }
813                 /*
814                  * Below Threshold?
815                  * ----------------
816                  * Turn OFF all cooling devices associated with this
817                  * threshold.
818                  */
819                 for (j = 0; j < active->devices.count; j++)
820                         result = acpi_bus_set_power(active->devices.handles[j],
821                                                     ACPI_STATE_D3);
822         }
823 }
824
825 static void acpi_thermal_check(void *data)
826 {
827         int result = 0;
828         struct acpi_thermal *tz = data;
829         unsigned long sleep_time = 0;
830         unsigned long timeout_jiffies = 0;
831         int i = 0;
832         struct acpi_thermal_state state;
833
834
835         if (!tz) {
836                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
837                 return;
838         }
839
840         /* Check if someone else is already running */
841         if (!mutex_trylock(&tz->lock))
842                 return;
843
844         state = tz->state;
845
846         result = acpi_thermal_get_temperature(tz);
847         if (result)
848                 goto unlock;
849
850         if (!tz->tz_enabled)
851                 goto unlock;
852
853         memset(&tz->state, 0, sizeof(tz->state));
854
855         /*
856          * Check Trip Points
857          * -----------------
858          * Compare the current temperature to the trip point values to see
859          * if we've entered one of the thermal policy states.  Note that
860          * this function determines when a state is entered, but the 
861          * individual policy decides when it is exited (e.g. hysteresis).
862          */
863         if (tz->trips.critical.flags.valid)
864                 state.critical |=
865                     (tz->temperature >= tz->trips.critical.temperature);
866         if (tz->trips.hot.flags.valid)
867                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
868         if (tz->trips.passive.flags.valid)
869                 state.passive |=
870                     (tz->temperature >= tz->trips.passive.temperature);
871         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
872                 if (tz->trips.active[i].flags.valid)
873                         state.active |=
874                             (tz->temperature >=
875                              tz->trips.active[i].temperature);
876
877         /*
878          * Invoke Policy
879          * -------------
880          * Separated from the above check to allow individual policy to 
881          * determine when to exit a given state.
882          */
883         if (state.critical)
884                 acpi_thermal_critical(tz);
885         if (state.hot)
886                 acpi_thermal_hot(tz);
887         if (state.passive)
888                 acpi_thermal_passive(tz);
889         if (state.active)
890                 acpi_thermal_active(tz);
891
892         /*
893          * Calculate State
894          * ---------------
895          * Again, separated from the above two to allow independent policy
896          * decisions.
897          */
898         tz->state.critical = tz->trips.critical.flags.enabled;
899         tz->state.hot = tz->trips.hot.flags.enabled;
900         tz->state.passive = tz->trips.passive.flags.enabled;
901         tz->state.active = 0;
902         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
903                 tz->state.active |= tz->trips.active[i].flags.enabled;
904
905         /*
906          * Calculate Sleep Time
907          * --------------------
908          * If we're in the passive state, use _TSP's value.  Otherwise
909          * use the default polling frequency (e.g. _TZP).  If no polling
910          * frequency is specified then we'll wait forever (at least until
911          * a thermal event occurs).  Note that _TSP and _TZD values are
912          * given in 1/10th seconds (we must covert to milliseconds).
913          */
914         if (tz->state.passive) {
915                 sleep_time = tz->trips.passive.tsp * 100;
916                 timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
917         } else if (tz->polling_frequency > 0) {
918                 sleep_time = tz->polling_frequency * 100;
919                 timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
920         }
921
922         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
923                           tz->name, tz->temperature, sleep_time));
924
925         /*
926          * Schedule Next Poll
927          * ------------------
928          */
929         if (!sleep_time) {
930                 if (timer_pending(&(tz->timer)))
931                         del_timer(&(tz->timer));
932         } else {
933                 if (timer_pending(&(tz->timer)))
934                         mod_timer(&(tz->timer), timeout_jiffies);
935                 else {
936                         tz->timer.data = (unsigned long)tz;
937                         tz->timer.function = acpi_thermal_run;
938                         tz->timer.expires = timeout_jiffies;
939                         add_timer(&(tz->timer));
940                 }
941         }
942       unlock:
943         mutex_unlock(&tz->lock);
944 }
945
946 /* sys I/F for generic thermal sysfs support */
947 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
948
949 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
950 {
951         struct acpi_thermal *tz = thermal->devdata;
952         int result;
953
954         if (!tz)
955                 return -EINVAL;
956
957         result = acpi_thermal_get_temperature(tz);
958         if (result)
959                 return result;
960
961         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature));
962 }
963
964 static const char enabled[] = "kernel";
965 static const char disabled[] = "user";
966 static int thermal_get_mode(struct thermal_zone_device *thermal,
967                                 char *buf)
968 {
969         struct acpi_thermal *tz = thermal->devdata;
970
971         if (!tz)
972                 return -EINVAL;
973
974         return sprintf(buf, "%s\n", tz->tz_enabled ?
975                         enabled : disabled);
976 }
977
978 static int thermal_set_mode(struct thermal_zone_device *thermal,
979                                 const char *buf)
980 {
981         struct acpi_thermal *tz = thermal->devdata;
982         int enable;
983
984         if (!tz)
985                 return -EINVAL;
986
987         /*
988          * enable/disable thermal management from ACPI thermal driver
989          */
990         if (!strncmp(buf, enabled, sizeof enabled - 1))
991                 enable = 1;
992         else if (!strncmp(buf, disabled, sizeof disabled - 1))
993                 enable = 0;
994         else
995                 return -EINVAL;
996
997         if (enable != tz->tz_enabled) {
998                 tz->tz_enabled = enable;
999                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1000                         "%s ACPI thermal control\n",
1001                         tz->tz_enabled ? enabled : disabled));
1002                 acpi_thermal_check(tz);
1003         }
1004         return 0;
1005 }
1006
1007 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
1008                                  int trip, char *buf)
1009 {
1010         struct acpi_thermal *tz = thermal->devdata;
1011         int i;
1012
1013         if (!tz || trip < 0)
1014                 return -EINVAL;
1015
1016         if (tz->trips.critical.flags.valid) {
1017                 if (!trip)
1018                         return sprintf(buf, "critical\n");
1019                 trip--;
1020         }
1021
1022         if (tz->trips.hot.flags.valid) {
1023                 if (!trip)
1024                         return sprintf(buf, "hot\n");
1025                 trip--;
1026         }
1027
1028         if (tz->trips.passive.flags.valid) {
1029                 if (!trip)
1030                         return sprintf(buf, "passive\n");
1031                 trip--;
1032         }
1033
1034         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1035                 tz->trips.active[i].flags.valid; i++) {
1036                 if (!trip)
1037                         return sprintf(buf, "active%d\n", i);
1038                 trip--;
1039         }
1040
1041         return -EINVAL;
1042 }
1043
1044 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
1045                                  int trip, char *buf)
1046 {
1047         struct acpi_thermal *tz = thermal->devdata;
1048         int i;
1049
1050         if (!tz || trip < 0)
1051                 return -EINVAL;
1052
1053         if (tz->trips.critical.flags.valid) {
1054                 if (!trip)
1055                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1056                                 tz->trips.critical.temperature));
1057                 trip--;
1058         }
1059
1060         if (tz->trips.hot.flags.valid) {
1061                 if (!trip)
1062                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1063                                         tz->trips.hot.temperature));
1064                 trip--;
1065         }
1066
1067         if (tz->trips.passive.flags.valid) {
1068                 if (!trip)
1069                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1070                                         tz->trips.passive.temperature));
1071                 trip--;
1072         }
1073
1074         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1075                 tz->trips.active[i].flags.valid; i++) {
1076                 if (!trip)
1077                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1078                                         tz->trips.active[i].temperature));
1079                 trip--;
1080         }
1081
1082         return -EINVAL;
1083 }
1084
1085 static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
1086                                 unsigned long *temperature) {
1087         struct acpi_thermal *tz = thermal->devdata;
1088
1089         if (tz->trips.critical.flags.valid) {
1090                 *temperature = KELVIN_TO_MILLICELSIUS(
1091                                 tz->trips.critical.temperature);
1092                 return 0;
1093         } else
1094                 return -EINVAL;
1095 }
1096
1097 typedef int (*cb)(struct thermal_zone_device *, int,
1098                   struct thermal_cooling_device *);
1099 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
1100                                         struct thermal_cooling_device *cdev,
1101                                         cb action)
1102 {
1103         struct acpi_device *device = cdev->devdata;
1104         struct acpi_thermal *tz = thermal->devdata;
1105         struct acpi_device *dev;
1106         acpi_status status;
1107         acpi_handle handle;
1108         int i;
1109         int j;
1110         int trip = -1;
1111         int result = 0;
1112
1113         if (tz->trips.critical.flags.valid)
1114                 trip++;
1115
1116         if (tz->trips.hot.flags.valid)
1117                 trip++;
1118
1119         if (tz->trips.passive.flags.valid) {
1120                 trip++;
1121                 for (i = 0; i < tz->trips.passive.devices.count;
1122                     i++) {
1123                         handle = tz->trips.passive.devices.handles[i];
1124                         status = acpi_bus_get_device(handle, &dev);
1125                         if (ACPI_SUCCESS(status) && (dev == device)) {
1126                                 result = action(thermal, trip, cdev);
1127                                 if (result)
1128                                         goto failed;
1129                         }
1130                 }
1131         }
1132
1133         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1134                 if (!tz->trips.active[i].flags.valid)
1135                         break;
1136                 trip++;
1137                 for (j = 0;
1138                     j < tz->trips.active[i].devices.count;
1139                     j++) {
1140                         handle = tz->trips.active[i].devices.handles[j];
1141                         status = acpi_bus_get_device(handle, &dev);
1142                         if (ACPI_SUCCESS(status) && (dev == device)) {
1143                                 result = action(thermal, trip, cdev);
1144                                 if (result)
1145                                         goto failed;
1146                         }
1147                 }
1148         }
1149
1150         for (i = 0; i < tz->devices.count; i++) {
1151                 handle = tz->devices.handles[i];
1152                 status = acpi_bus_get_device(handle, &dev);
1153                 if (ACPI_SUCCESS(status) && (dev == device)) {
1154                         result = action(thermal, -1, cdev);
1155                         if (result)
1156                                 goto failed;
1157                 }
1158         }
1159
1160 failed:
1161         return result;
1162 }
1163
1164 static int
1165 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1166                                         struct thermal_cooling_device *cdev)
1167 {
1168         return acpi_thermal_cooling_device_cb(thermal, cdev,
1169                                 thermal_zone_bind_cooling_device);
1170 }
1171
1172 static int
1173 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
1174                                         struct thermal_cooling_device *cdev)
1175 {
1176         return acpi_thermal_cooling_device_cb(thermal, cdev,
1177                                 thermal_zone_unbind_cooling_device);
1178 }
1179
1180 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1181         .bind = acpi_thermal_bind_cooling_device,
1182         .unbind = acpi_thermal_unbind_cooling_device,
1183         .get_temp = thermal_get_temp,
1184         .get_mode = thermal_get_mode,
1185         .set_mode = thermal_set_mode,
1186         .get_trip_type = thermal_get_trip_type,
1187         .get_trip_temp = thermal_get_trip_temp,
1188         .get_crit_temp = thermal_get_crit_temp,
1189 };
1190
1191 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1192 {
1193         int trips = 0;
1194         int result;
1195         acpi_status status;
1196         int i;
1197
1198         if (tz->trips.critical.flags.valid)
1199                 trips++;
1200
1201         if (tz->trips.hot.flags.valid)
1202                 trips++;
1203
1204         if (tz->trips.passive.flags.valid)
1205                 trips++;
1206
1207         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1208                         tz->trips.active[i].flags.valid; i++, trips++);
1209         tz->thermal_zone = thermal_zone_device_register("acpitz",
1210                                         trips, tz, &acpi_thermal_zone_ops);
1211         if (IS_ERR(tz->thermal_zone))
1212                 return -ENODEV;
1213
1214         result = sysfs_create_link(&tz->device->dev.kobj,
1215                                    &tz->thermal_zone->device.kobj, "thermal_zone");
1216         if (result)
1217                 return result;
1218
1219         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1220                                    &tz->device->dev.kobj, "device");
1221         if (result)
1222                 return result;
1223
1224         status = acpi_attach_data(tz->device->handle,
1225                                   acpi_bus_private_data_handler,
1226                                   tz->thermal_zone);
1227         if (ACPI_FAILURE(status)) {
1228                 printk(KERN_ERR PREFIX
1229                                 "Error attaching device data\n");
1230                 return -ENODEV;
1231         }
1232
1233         tz->tz_enabled = 1;
1234
1235         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
1236                  tz->thermal_zone->id);
1237         return 0;
1238 }
1239
1240 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1241 {
1242         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1243         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1244         thermal_zone_device_unregister(tz->thermal_zone);
1245         tz->thermal_zone = NULL;
1246         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
1247 }
1248
1249
1250 /* --------------------------------------------------------------------------
1251                               FS Interface (/proc)
1252    -------------------------------------------------------------------------- */
1253
1254 static struct proc_dir_entry *acpi_thermal_dir;
1255
1256 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1257 {
1258         struct acpi_thermal *tz = seq->private;
1259
1260
1261         if (!tz)
1262                 goto end;
1263
1264         seq_puts(seq, "state:                   ");
1265
1266         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1267             && !tz->state.active)
1268                 seq_puts(seq, "ok\n");
1269         else {
1270                 if (tz->state.critical)
1271                         seq_puts(seq, "critical ");
1272                 if (tz->state.hot)
1273                         seq_puts(seq, "hot ");
1274                 if (tz->state.passive)
1275                         seq_puts(seq, "passive ");
1276                 if (tz->state.active)
1277                         seq_printf(seq, "active[%d]", tz->state.active_index);
1278                 seq_puts(seq, "\n");
1279         }
1280
1281       end:
1282         return 0;
1283 }
1284
1285 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1286 {
1287         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1288 }
1289
1290 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1291 {
1292         int result = 0;
1293         struct acpi_thermal *tz = seq->private;
1294
1295
1296         if (!tz)
1297                 goto end;
1298
1299         result = acpi_thermal_get_temperature(tz);
1300         if (result)
1301                 goto end;
1302
1303         seq_printf(seq, "temperature:             %ld C\n",
1304                    KELVIN_TO_CELSIUS(tz->temperature));
1305
1306       end:
1307         return 0;
1308 }
1309
1310 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1311 {
1312         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1313 }
1314
1315 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1316 {
1317         struct acpi_thermal *tz = seq->private;
1318         struct acpi_device *device;
1319         acpi_status status;
1320
1321         int i = 0;
1322         int j = 0;
1323
1324
1325         if (!tz)
1326                 goto end;
1327
1328         if (tz->trips.critical.flags.valid)
1329                 seq_printf(seq, "critical (S5):           %ld C%s",
1330                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1331                            nocrt ? " <disabled>\n" : "\n");
1332
1333         if (tz->trips.hot.flags.valid)
1334                 seq_printf(seq, "hot (S4):                %ld C%s",
1335                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1336                            nocrt ? " <disabled>\n" : "\n");
1337
1338         if (tz->trips.passive.flags.valid) {
1339                 seq_printf(seq,
1340                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1341                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1342                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1343                            tz->trips.passive.tsp);
1344                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1345                         status = acpi_bus_get_device(tz->trips.passive.devices.
1346                                                      handles[j], &device);
1347                         seq_printf(seq, "%4.4s ", status ? "" :
1348                                    acpi_device_bid(device));
1349                 }
1350                 seq_puts(seq, "\n");
1351         }
1352
1353         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1354                 if (!(tz->trips.active[i].flags.valid))
1355                         break;
1356                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1357                            i,
1358                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1359                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1360                         status = acpi_bus_get_device(tz->trips.active[i].
1361                                                      devices.handles[j],
1362                                                      &device);
1363                         seq_printf(seq, "%4.4s ", status ? "" :
1364                                    acpi_device_bid(device));
1365                 }
1366                 seq_puts(seq, "\n");
1367         }
1368
1369       end:
1370         return 0;
1371 }
1372
1373 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1374 {
1375         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1376 }
1377
1378 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1379 {
1380         struct acpi_thermal *tz = seq->private;
1381
1382
1383         if (!tz)
1384                 goto end;
1385
1386         if (!tz->flags.cooling_mode)
1387                 seq_puts(seq, "<setting not supported>\n");
1388         else
1389                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1390
1391       end:
1392         return 0;
1393 }
1394
1395 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1396 {
1397         return single_open(file, acpi_thermal_cooling_seq_show,
1398                            PDE(inode)->data);
1399 }
1400
1401 static ssize_t
1402 acpi_thermal_write_cooling_mode(struct file *file,
1403                                 const char __user * buffer,
1404                                 size_t count, loff_t * ppos)
1405 {
1406         struct seq_file *m = file->private_data;
1407         struct acpi_thermal *tz = m->private;
1408         int result = 0;
1409         char mode_string[12] = { '\0' };
1410
1411
1412         if (!tz || (count > sizeof(mode_string) - 1))
1413                 return -EINVAL;
1414
1415         if (!tz->flags.cooling_mode)
1416                 return -ENODEV;
1417
1418         if (copy_from_user(mode_string, buffer, count))
1419                 return -EFAULT;
1420
1421         mode_string[count] = '\0';
1422
1423         result = acpi_thermal_set_cooling_mode(tz,
1424                                                simple_strtoul(mode_string, NULL,
1425                                                               0));
1426         if (result)
1427                 return result;
1428
1429         acpi_thermal_check(tz);
1430
1431         return count;
1432 }
1433
1434 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1435 {
1436         struct acpi_thermal *tz = seq->private;
1437
1438
1439         if (!tz)
1440                 goto end;
1441
1442         if (!tz->polling_frequency) {
1443                 seq_puts(seq, "<polling disabled>\n");
1444                 goto end;
1445         }
1446
1447         seq_printf(seq, "polling frequency:       %lu seconds\n",
1448                    (tz->polling_frequency / 10));
1449
1450       end:
1451         return 0;
1452 }
1453
1454 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1455 {
1456         return single_open(file, acpi_thermal_polling_seq_show,
1457                            PDE(inode)->data);
1458 }
1459
1460 static ssize_t
1461 acpi_thermal_write_polling(struct file *file,
1462                            const char __user * buffer,
1463                            size_t count, loff_t * ppos)
1464 {
1465         struct seq_file *m = file->private_data;
1466         struct acpi_thermal *tz = m->private;
1467         int result = 0;
1468         char polling_string[12] = { '\0' };
1469         int seconds = 0;
1470
1471
1472         if (!tz || (count > sizeof(polling_string) - 1))
1473                 return -EINVAL;
1474
1475         if (copy_from_user(polling_string, buffer, count))
1476                 return -EFAULT;
1477
1478         polling_string[count] = '\0';
1479
1480         seconds = simple_strtoul(polling_string, NULL, 0);
1481
1482         result = acpi_thermal_set_polling(tz, seconds);
1483         if (result)
1484                 return result;
1485
1486         acpi_thermal_check(tz);
1487
1488         return count;
1489 }
1490
1491 static int acpi_thermal_add_fs(struct acpi_device *device)
1492 {
1493         struct proc_dir_entry *entry = NULL;
1494
1495
1496         if (!acpi_device_dir(device)) {
1497                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1498                                                      acpi_thermal_dir);
1499                 if (!acpi_device_dir(device))
1500                         return -ENODEV;
1501                 acpi_device_dir(device)->owner = THIS_MODULE;
1502         }
1503
1504         /* 'state' [R] */
1505         entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1506                                  S_IRUGO, acpi_device_dir(device),
1507                                  &acpi_thermal_state_fops,
1508                                  acpi_driver_data(device));
1509         if (!entry)
1510                 return -ENODEV;
1511
1512         /* 'temperature' [R] */
1513         entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1514                                  S_IRUGO, acpi_device_dir(device),
1515                                  &acpi_thermal_temp_fops,
1516                                  acpi_driver_data(device));
1517         if (!entry)
1518                 return -ENODEV;
1519
1520         /* 'trip_points' [R] */
1521         entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1522                                  S_IRUGO,
1523                                  acpi_device_dir(device),
1524                                  &acpi_thermal_trip_fops,
1525                                  acpi_driver_data(device));
1526         if (!entry)
1527                 return -ENODEV;
1528
1529         /* 'cooling_mode' [R/W] */
1530         entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1531                                  S_IFREG | S_IRUGO | S_IWUSR,
1532                                  acpi_device_dir(device),
1533                                  &acpi_thermal_cooling_fops,
1534                                  acpi_driver_data(device));
1535         if (!entry)
1536                 return -ENODEV;
1537
1538         /* 'polling_frequency' [R/W] */
1539         entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1540                                  S_IFREG | S_IRUGO | S_IWUSR,
1541                                  acpi_device_dir(device),
1542                                  &acpi_thermal_polling_fops,
1543                                  acpi_driver_data(device));
1544         if (!entry)
1545                 return -ENODEV;
1546         return 0;
1547 }
1548
1549 static int acpi_thermal_remove_fs(struct acpi_device *device)
1550 {
1551
1552         if (acpi_device_dir(device)) {
1553                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1554                                   acpi_device_dir(device));
1555                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1556                                   acpi_device_dir(device));
1557                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1558                                   acpi_device_dir(device));
1559                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1560                                   acpi_device_dir(device));
1561                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1562                                   acpi_device_dir(device));
1563                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1564                 acpi_device_dir(device) = NULL;
1565         }
1566
1567         return 0;
1568 }
1569
1570 /* --------------------------------------------------------------------------
1571                                  Driver Interface
1572    -------------------------------------------------------------------------- */
1573
1574 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1575 {
1576         struct acpi_thermal *tz = data;
1577         struct acpi_device *device = NULL;
1578
1579
1580         if (!tz)
1581                 return;
1582
1583         device = tz->device;
1584
1585         switch (event) {
1586         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1587                 acpi_thermal_check(tz);
1588                 break;
1589         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1590                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1591                 acpi_thermal_check(tz);
1592                 acpi_bus_generate_proc_event(device, event, 0);
1593                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1594                                                   device->dev.bus_id, event, 0);
1595                 break;
1596         case ACPI_THERMAL_NOTIFY_DEVICES:
1597                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1598                 acpi_thermal_check(tz);
1599                 acpi_bus_generate_proc_event(device, event, 0);
1600                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1601                                                   device->dev.bus_id, event, 0);
1602                 break;
1603         default:
1604                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1605                                   "Unsupported event [0x%x]\n", event));
1606                 break;
1607         }
1608
1609         return;
1610 }
1611
1612 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1613 {
1614         int result = 0;
1615
1616
1617         if (!tz)
1618                 return -EINVAL;
1619
1620         /* Get temperature [_TMP] (required) */
1621         result = acpi_thermal_get_temperature(tz);
1622         if (result)
1623                 return result;
1624
1625         /* Get trip points [_CRT, _PSV, etc.] (required) */
1626         result = acpi_thermal_get_trip_points(tz);
1627         if (result)
1628                 return result;
1629
1630         /* Set the cooling mode [_SCP] to active cooling (default) */
1631         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1632         if (!result)
1633                 tz->flags.cooling_mode = 1;
1634
1635         /* Get default polling frequency [_TZP] (optional) */
1636         if (tzp)
1637                 tz->polling_frequency = tzp;
1638         else
1639                 acpi_thermal_get_polling_frequency(tz);
1640
1641         return 0;
1642 }
1643
1644 static int acpi_thermal_add(struct acpi_device *device)
1645 {
1646         int result = 0;
1647         acpi_status status = AE_OK;
1648         struct acpi_thermal *tz = NULL;
1649
1650
1651         if (!device)
1652                 return -EINVAL;
1653
1654         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1655         if (!tz)
1656                 return -ENOMEM;
1657
1658         tz->device = device;
1659         strcpy(tz->name, device->pnp.bus_id);
1660         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1661         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1662         device->driver_data = tz;
1663         mutex_init(&tz->lock);
1664
1665
1666         result = acpi_thermal_get_info(tz);
1667         if (result)
1668                 goto free_memory;
1669
1670         result = acpi_thermal_register_thermal_zone(tz);
1671         if (result)
1672                 goto free_memory;
1673
1674         result = acpi_thermal_add_fs(device);
1675         if (result)
1676                 goto unregister_thermal_zone;
1677
1678         init_timer(&tz->timer);
1679
1680         acpi_thermal_active_off(tz);
1681
1682         acpi_thermal_check(tz);
1683
1684         status = acpi_install_notify_handler(device->handle,
1685                                              ACPI_DEVICE_NOTIFY,
1686                                              acpi_thermal_notify, tz);
1687         if (ACPI_FAILURE(status)) {
1688                 result = -ENODEV;
1689                 goto remove_fs;
1690         }
1691
1692         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1693                acpi_device_name(device), acpi_device_bid(device),
1694                KELVIN_TO_CELSIUS(tz->temperature));
1695         goto end;
1696
1697 remove_fs:
1698         acpi_thermal_remove_fs(device);
1699 unregister_thermal_zone:
1700         thermal_zone_device_unregister(tz->thermal_zone);
1701 free_memory:
1702         kfree(tz);
1703 end:
1704         return result;
1705 }
1706
1707 static int acpi_thermal_remove(struct acpi_device *device, int type)
1708 {
1709         acpi_status status = AE_OK;
1710         struct acpi_thermal *tz = NULL;
1711
1712
1713         if (!device || !acpi_driver_data(device))
1714                 return -EINVAL;
1715
1716         tz = acpi_driver_data(device);
1717
1718         /* avoid timer adding new defer task */
1719         tz->zombie = 1;
1720         /* wait for running timer (on other CPUs) finish */
1721         del_timer_sync(&(tz->timer));
1722         /* synchronize deferred task */
1723         acpi_os_wait_events_complete(NULL);
1724         /* deferred task may reinsert timer */
1725         del_timer_sync(&(tz->timer));
1726
1727         status = acpi_remove_notify_handler(device->handle,
1728                                             ACPI_DEVICE_NOTIFY,
1729                                             acpi_thermal_notify);
1730
1731         /* Terminate policy */
1732         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1733                 tz->trips.passive.flags.enabled = 0;
1734                 acpi_thermal_passive(tz);
1735         }
1736         if (tz->trips.active[0].flags.valid
1737             && tz->trips.active[0].flags.enabled) {
1738                 tz->trips.active[0].flags.enabled = 0;
1739                 acpi_thermal_active(tz);
1740         }
1741
1742         acpi_thermal_remove_fs(device);
1743         acpi_thermal_unregister_thermal_zone(tz);
1744         mutex_destroy(&tz->lock);
1745         kfree(tz);
1746         return 0;
1747 }
1748
1749 static int acpi_thermal_resume(struct acpi_device *device)
1750 {
1751         struct acpi_thermal *tz = NULL;
1752         int i, j, power_state, result;
1753
1754
1755         if (!device || !acpi_driver_data(device))
1756                 return -EINVAL;
1757
1758         tz = acpi_driver_data(device);
1759
1760         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1761                 if (!(&tz->trips.active[i]))
1762                         break;
1763                 if (!tz->trips.active[i].flags.valid)
1764                         break;
1765                 tz->trips.active[i].flags.enabled = 1;
1766                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1767                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1768                             handles[j], &power_state);
1769                         if (result || (power_state != ACPI_STATE_D0)) {
1770                                 tz->trips.active[i].flags.enabled = 0;
1771                                 break;
1772                         }
1773                 }
1774                 tz->state.active |= tz->trips.active[i].flags.enabled;
1775         }
1776
1777         acpi_thermal_check(tz);
1778
1779         return AE_OK;
1780 }
1781
1782 static int thermal_act(const struct dmi_system_id *d) {
1783
1784         if (act == 0) {
1785                 printk(KERN_NOTICE "ACPI: %s detected: "
1786                         "disabling all active thermal trip points\n", d->ident);
1787                 act = -1;
1788         }
1789         return 0;
1790 }
1791 static int thermal_nocrt(const struct dmi_system_id *d) {
1792
1793         printk(KERN_NOTICE "ACPI: %s detected: "
1794                 "disabling all critical thermal trip point actions.\n", d->ident);
1795         nocrt = 1;
1796         return 0;
1797 }
1798 static int thermal_tzp(const struct dmi_system_id *d) {
1799
1800         if (tzp == 0) {
1801                 printk(KERN_NOTICE "ACPI: %s detected: "
1802                         "enabling thermal zone polling\n", d->ident);
1803                 tzp = 300;      /* 300 dS = 30 Seconds */
1804         }
1805         return 0;
1806 }
1807 static int thermal_psv(const struct dmi_system_id *d) {
1808
1809         if (psv == 0) {
1810                 printk(KERN_NOTICE "ACPI: %s detected: "
1811                         "disabling all passive thermal trip points\n", d->ident);
1812                 psv = -1;
1813         }
1814         return 0;
1815 }
1816
1817 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1818         /*
1819          * Award BIOS on this AOpen makes thermal control almost worthless.
1820          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1821          */
1822         {
1823          .callback = thermal_act,
1824          .ident = "AOpen i915GMm-HFS",
1825          .matches = {
1826                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1827                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1828                 },
1829         },
1830         {
1831          .callback = thermal_psv,
1832          .ident = "AOpen i915GMm-HFS",
1833          .matches = {
1834                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1835                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1836                 },
1837         },
1838         {
1839          .callback = thermal_tzp,
1840          .ident = "AOpen i915GMm-HFS",
1841          .matches = {
1842                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1843                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1844                 },
1845         },
1846         {
1847          .callback = thermal_nocrt,
1848          .ident = "Gigabyte GA-7ZX",
1849          .matches = {
1850                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1851                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1852                 },
1853         },
1854         {}
1855 };
1856
1857 static int __init acpi_thermal_init(void)
1858 {
1859         int result = 0;
1860
1861         dmi_check_system(thermal_dmi_table);
1862
1863         if (off) {
1864                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1865                 return -ENODEV;
1866         }
1867         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1868         if (!acpi_thermal_dir)
1869                 return -ENODEV;
1870         acpi_thermal_dir->owner = THIS_MODULE;
1871
1872         result = acpi_bus_register_driver(&acpi_thermal_driver);
1873         if (result < 0) {
1874                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1875                 return -ENODEV;
1876         }
1877
1878         return 0;
1879 }
1880
1881 static void __exit acpi_thermal_exit(void)
1882 {
1883
1884         acpi_bus_unregister_driver(&acpi_thermal_driver);
1885
1886         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1887
1888         return;
1889 }
1890
1891 module_init(acpi_thermal_init);
1892 module_exit(acpi_thermal_exit);