766bd25d3376ac35f326c72ae9909777bb839004
[linux-2.6.git] / drivers / acpi / thermal.c
1 /*
2  *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
3  *
4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or (at
12  *  your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful, but
15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  *  General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License along
20  *  with this program; if not, write to the Free Software Foundation, Inc.,
21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  *
25  *  This driver fully implements the ACPI thermal policy as described in the
26  *  ACPI 2.0 Specification.
27  *
28  *  TBD: 1. Implement passive cooling hysteresis.
29  *       2. Enhance passive cooling (CPU) states/limit interface to support
30  *          concepts of 'multiple limiters', upper/lower limits, etc.
31  *
32  */
33
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/dmi.h>
37 #include <linux/init.h>
38 #include <linux/types.h>
39 #include <linux/proc_fs.h>
40 #include <linux/timer.h>
41 #include <linux/jiffies.h>
42 #include <linux/kmod.h>
43 #include <linux/seq_file.h>
44 #include <linux/reboot.h>
45 #include <asm/uaccess.h>
46 #include <linux/thermal.h>
47 #include <acpi/acpi_bus.h>
48 #include <acpi/acpi_drivers.h>
49
50 #define ACPI_THERMAL_COMPONENT          0x04000000
51 #define ACPI_THERMAL_CLASS              "thermal_zone"
52 #define ACPI_THERMAL_DEVICE_NAME        "Thermal Zone"
53 #define ACPI_THERMAL_FILE_STATE         "state"
54 #define ACPI_THERMAL_FILE_TEMPERATURE   "temperature"
55 #define ACPI_THERMAL_FILE_TRIP_POINTS   "trip_points"
56 #define ACPI_THERMAL_FILE_COOLING_MODE  "cooling_mode"
57 #define ACPI_THERMAL_FILE_POLLING_FREQ  "polling_frequency"
58 #define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
59 #define ACPI_THERMAL_NOTIFY_THRESHOLDS  0x81
60 #define ACPI_THERMAL_NOTIFY_DEVICES     0x82
61 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
62 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
63 #define ACPI_THERMAL_MODE_ACTIVE        0x00
64
65 #define ACPI_THERMAL_MAX_ACTIVE 10
66 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
67
68 #define _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         .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         .open = acpi_thermal_temp_open_fs,
209         .read = seq_read,
210         .llseek = seq_lseek,
211         .release = single_release,
212 };
213
214 static const struct file_operations acpi_thermal_trip_fops = {
215         .open = acpi_thermal_trip_open_fs,
216         .read = seq_read,
217         .llseek = seq_lseek,
218         .release = single_release,
219 };
220
221 static const struct file_operations acpi_thermal_cooling_fops = {
222         .open = acpi_thermal_cooling_open_fs,
223         .read = seq_read,
224         .write = acpi_thermal_write_cooling_mode,
225         .llseek = seq_lseek,
226         .release = single_release,
227 };
228
229 static const struct file_operations acpi_thermal_polling_fops = {
230         .open = acpi_thermal_polling_open_fs,
231         .read = seq_read,
232         .write = acpi_thermal_write_polling,
233         .llseek = seq_lseek,
234         .release = single_release,
235 };
236
237 /* --------------------------------------------------------------------------
238                              Thermal Zone Management
239    -------------------------------------------------------------------------- */
240
241 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
242 {
243         acpi_status status = AE_OK;
244
245
246         if (!tz)
247                 return -EINVAL;
248
249         tz->last_temperature = tz->temperature;
250
251         status =
252             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
253         if (ACPI_FAILURE(status))
254                 return -ENODEV;
255
256         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
257                           tz->temperature));
258
259         return 0;
260 }
261
262 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
263 {
264         acpi_status status = AE_OK;
265
266
267         if (!tz)
268                 return -EINVAL;
269
270         status =
271             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
272                                   &tz->polling_frequency);
273         if (ACPI_FAILURE(status))
274                 return -ENODEV;
275
276         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
277                           tz->polling_frequency));
278
279         return 0;
280 }
281
282 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
283 {
284
285         if (!tz)
286                 return -EINVAL;
287
288         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
289
290         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
291                           "Polling frequency set to %lu seconds\n",
292                           tz->polling_frequency/10));
293
294         return 0;
295 }
296
297 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
298 {
299         acpi_status status = AE_OK;
300         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
301         struct acpi_object_list arg_list = { 1, &arg0 };
302         acpi_handle handle = NULL;
303
304
305         if (!tz)
306                 return -EINVAL;
307
308         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
309         if (ACPI_FAILURE(status)) {
310                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
311                 return -ENODEV;
312         }
313
314         arg0.integer.value = mode;
315
316         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
317         if (ACPI_FAILURE(status))
318                 return -ENODEV;
319
320         return 0;
321 }
322
323 #define ACPI_TRIPS_CRITICAL     0x01
324 #define ACPI_TRIPS_HOT          0x02
325 #define ACPI_TRIPS_PASSIVE      0x04
326 #define ACPI_TRIPS_ACTIVE       0x08
327 #define ACPI_TRIPS_DEVICES      0x10
328
329 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
330 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
331
332 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
333                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
334                               ACPI_TRIPS_DEVICES)
335
336 /*
337  * This exception is thrown out in two cases:
338  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
339  *   when re-evaluating the AML code.
340  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
341  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
342  */
343 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
344 do {    \
345         if (flags != ACPI_TRIPS_INIT)   \
346                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
347                 "ACPI thermal trip point %s changed\n"  \
348                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
349 } while (0)
350
351 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
352 {
353         acpi_status status = AE_OK;
354         struct acpi_handle_list devices;
355         int valid = 0;
356         int i;
357
358         /* Critical Shutdown (required) */
359         if (flag & ACPI_TRIPS_CRITICAL) {
360                 status = acpi_evaluate_integer(tz->device->handle,
361                                 "_CRT", NULL, &tz->trips.critical.temperature);
362                 if (ACPI_FAILURE(status)) {
363                         tz->trips.critical.flags.valid = 0;
364                         ACPI_EXCEPTION((AE_INFO, status,
365                                         "No critical threshold"));
366                         return -ENODEV;
367                 } else {
368                         tz->trips.critical.flags.valid = 1;
369                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
370                                         "Found critical threshold [%lu]\n",
371                                         tz->trips.critical.temperature));
372                 }
373                 if (tz->trips.critical.flags.valid == 1) {
374                         if (crt == -1) {
375                                 tz->trips.critical.flags.valid = 0;
376                         } else if (crt > 0) {
377                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
378                                 /*
379                                  * Allow override to lower critical threshold
380                                  */
381                                 if (crt_k < tz->trips.critical.temperature)
382                                         tz->trips.critical.temperature = crt_k;
383                         }
384                 }
385         }
386
387         /* Critical Sleep (optional) */
388         if (flag & ACPI_TRIPS_HOT) {
389                 status = acpi_evaluate_integer(tz->device->handle,
390                                 "_HOT", NULL, &tz->trips.hot.temperature);
391                 if (ACPI_FAILURE(status)) {
392                         tz->trips.hot.flags.valid = 0;
393                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
394                                         "No hot threshold\n"));
395                 } else {
396                         tz->trips.hot.flags.valid = 1;
397                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
398                                         "Found hot threshold [%lu]\n",
399                                         tz->trips.critical.temperature));
400                 }
401         }
402
403         /* Passive (optional) */
404         if (flag & ACPI_TRIPS_PASSIVE) {
405                 valid = tz->trips.passive.flags.valid;
406                 if (psv == -1) {
407                         status = AE_SUPPORT;
408                 } else if (psv > 0) {
409                         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
410                         status = AE_OK;
411                 } else {
412                         status = acpi_evaluate_integer(tz->device->handle,
413                                 "_PSV", NULL, &tz->trips.passive.temperature);
414                 }
415
416                 if (ACPI_FAILURE(status))
417                         tz->trips.passive.flags.valid = 0;
418                 else {
419                         tz->trips.passive.flags.valid = 1;
420                         if (flag == ACPI_TRIPS_INIT) {
421                                 status = acpi_evaluate_integer(
422                                                 tz->device->handle, "_TC1",
423                                                 NULL, &tz->trips.passive.tc1);
424                                 if (ACPI_FAILURE(status))
425                                         tz->trips.passive.flags.valid = 0;
426                                 status = acpi_evaluate_integer(
427                                                 tz->device->handle, "_TC2",
428                                                 NULL, &tz->trips.passive.tc2);
429                                 if (ACPI_FAILURE(status))
430                                         tz->trips.passive.flags.valid = 0;
431                                 status = acpi_evaluate_integer(
432                                                 tz->device->handle, "_TSP",
433                                                 NULL, &tz->trips.passive.tsp);
434                                 if (ACPI_FAILURE(status))
435                                         tz->trips.passive.flags.valid = 0;
436                         }
437                 }
438         }
439         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
440                 memset(&devices, 0, sizeof(struct acpi_handle_list));
441                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
442                                                         NULL, &devices);
443                 if (ACPI_FAILURE(status))
444                         tz->trips.passive.flags.valid = 0;
445                 else
446                         tz->trips.passive.flags.valid = 1;
447
448                 if (memcmp(&tz->trips.passive.devices, &devices,
449                                 sizeof(struct acpi_handle_list))) {
450                         memcpy(&tz->trips.passive.devices, &devices,
451                                 sizeof(struct acpi_handle_list));
452                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
453                 }
454         }
455         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
456                 if (valid != tz->trips.passive.flags.valid)
457                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
458         }
459
460         /* Active (optional) */
461         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
462                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
463                 valid = tz->trips.active[i].flags.valid;
464
465                 if (act == -1)
466                         break; /* disable all active trip points */
467
468                 if (flag & ACPI_TRIPS_ACTIVE) {
469                         status = acpi_evaluate_integer(tz->device->handle,
470                                 name, NULL, &tz->trips.active[i].temperature);
471                         if (ACPI_FAILURE(status)) {
472                                 tz->trips.active[i].flags.valid = 0;
473                                 if (i == 0)
474                                         break;
475                                 if (act <= 0)
476                                         break;
477                                 if (i == 1)
478                                         tz->trips.active[0].temperature =
479                                                 CELSIUS_TO_KELVIN(act);
480                                 else
481                                         /*
482                                          * Don't allow override higher than
483                                          * the next higher trip point
484                                          */
485                                         tz->trips.active[i - 1].temperature =
486                                                 (tz->trips.active[i - 2].temperature <
487                                                 CELSIUS_TO_KELVIN(act) ?
488                                                 tz->trips.active[i - 2].temperature :
489                                                 CELSIUS_TO_KELVIN(act));
490                                 break;
491                         } else
492                                 tz->trips.active[i].flags.valid = 1;
493                 }
494
495                 name[2] = 'L';
496                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
497                         memset(&devices, 0, sizeof(struct acpi_handle_list));
498                         status = acpi_evaluate_reference(tz->device->handle,
499                                                 name, NULL, &devices);
500                         if (ACPI_FAILURE(status))
501                                 tz->trips.active[i].flags.valid = 0;
502                         else
503                                 tz->trips.active[i].flags.valid = 1;
504
505                         if (memcmp(&tz->trips.active[i].devices, &devices,
506                                         sizeof(struct acpi_handle_list))) {
507                                 memcpy(&tz->trips.active[i].devices, &devices,
508                                         sizeof(struct acpi_handle_list));
509                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
510                         }
511                 }
512                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
513                         if (valid != tz->trips.active[i].flags.valid)
514                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
515
516                 if (!tz->trips.active[i].flags.valid)
517                         break;
518         }
519
520         if (flag & ACPI_TRIPS_DEVICES) {
521                 memset(&devices, 0, sizeof(struct acpi_handle_list));
522                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
523                                                 NULL, &devices);
524                 if (memcmp(&tz->devices, &devices,
525                                 sizeof(struct acpi_handle_list))) {
526                         memcpy(&tz->devices, &devices,
527                                 sizeof(struct acpi_handle_list));
528                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
529                 }
530         }
531
532         return 0;
533 }
534
535 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
536 {
537         return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
538 }
539
540 static int acpi_thermal_critical(struct acpi_thermal *tz)
541 {
542         if (!tz || !tz->trips.critical.flags.valid)
543                 return -EINVAL;
544
545         if (tz->temperature >= tz->trips.critical.temperature) {
546                 printk(KERN_WARNING PREFIX "Critical trip point\n");
547                 tz->trips.critical.flags.enabled = 1;
548         } else if (tz->trips.critical.flags.enabled)
549                 tz->trips.critical.flags.enabled = 0;
550
551         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
552                                 tz->trips.critical.flags.enabled);
553         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
554                                           tz->device->dev.bus_id,
555                                           ACPI_THERMAL_NOTIFY_CRITICAL,
556                                           tz->trips.critical.flags.enabled);
557
558         /* take no action if nocrt is set */
559         if(!nocrt) {
560                 printk(KERN_EMERG
561                         "Critical temperature reached (%ld C), shutting down.\n",
562                         KELVIN_TO_CELSIUS(tz->temperature));
563                 orderly_poweroff(true);
564         }
565
566         return 0;
567 }
568
569 static int acpi_thermal_hot(struct acpi_thermal *tz)
570 {
571         if (!tz || !tz->trips.hot.flags.valid)
572                 return -EINVAL;
573
574         if (tz->temperature >= tz->trips.hot.temperature) {
575                 printk(KERN_WARNING PREFIX "Hot trip point\n");
576                 tz->trips.hot.flags.enabled = 1;
577         } else if (tz->trips.hot.flags.enabled)
578                 tz->trips.hot.flags.enabled = 0;
579
580         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
581                                 tz->trips.hot.flags.enabled);
582         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
583                                           tz->device->dev.bus_id,
584                                           ACPI_THERMAL_NOTIFY_HOT,
585                                           tz->trips.hot.flags.enabled);
586
587         /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
588
589         return 0;
590 }
591
592 static void acpi_thermal_passive(struct acpi_thermal *tz)
593 {
594         int result = 1;
595         struct acpi_thermal_passive *passive = NULL;
596         int trend = 0;
597         int i = 0;
598
599
600         if (!tz || !tz->trips.passive.flags.valid)
601                 return;
602
603         passive = &(tz->trips.passive);
604
605         /*
606          * Above Trip?
607          * -----------
608          * Calculate the thermal trend (using the passive cooling equation)
609          * and modify the performance limit for all passive cooling devices
610          * accordingly.  Note that we assume symmetry.
611          */
612         if (tz->temperature >= passive->temperature) {
613                 trend =
614                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
615                     (passive->tc2 * (tz->temperature - passive->temperature));
616                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
617                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
618                                   trend, passive->tc1, tz->temperature,
619                                   tz->last_temperature, passive->tc2,
620                                   tz->temperature, passive->temperature));
621                 passive->flags.enabled = 1;
622                 /* Heating up? */
623                 if (trend > 0)
624                         for (i = 0; i < passive->devices.count; i++)
625                                 acpi_processor_set_thermal_limit(passive->
626                                                                  devices.
627                                                                  handles[i],
628                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
629                 /* Cooling off? */
630                 else if (trend < 0) {
631                         for (i = 0; i < passive->devices.count; i++)
632                                 /*
633                                  * assume that we are on highest
634                                  * freq/lowest thrott and can leave
635                                  * passive mode, even in error case
636                                  */
637                                 if (!acpi_processor_set_thermal_limit
638                                     (passive->devices.handles[i],
639                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
640                                         result = 0;
641                         /*
642                          * Leave cooling mode, even if the temp might
643                          * higher than trip point This is because some
644                          * machines might have long thermal polling
645                          * frequencies (tsp) defined. We will fall back
646                          * into passive mode in next cycle (probably quicker)
647                          */
648                         if (result) {
649                                 passive->flags.enabled = 0;
650                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
651                                                   "Disabling passive cooling, still above threshold,"
652                                                   " but we are cooling down\n"));
653                         }
654                 }
655                 return;
656         }
657
658         /*
659          * Below Trip?
660          * -----------
661          * Implement passive cooling hysteresis to slowly increase performance
662          * and avoid thrashing around the passive trip point.  Note that we
663          * assume symmetry.
664          */
665         if (!passive->flags.enabled)
666                 return;
667         for (i = 0; i < passive->devices.count; i++)
668                 if (!acpi_processor_set_thermal_limit
669                     (passive->devices.handles[i],
670                      ACPI_PROCESSOR_LIMIT_DECREMENT))
671                         result = 0;
672         if (result) {
673                 passive->flags.enabled = 0;
674                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
675                                   "Disabling passive cooling (zone is cool)\n"));
676         }
677 }
678
679 static void acpi_thermal_active(struct acpi_thermal *tz)
680 {
681         int result = 0;
682         struct acpi_thermal_active *active = NULL;
683         int i = 0;
684         int j = 0;
685         unsigned long maxtemp = 0;
686
687
688         if (!tz)
689                 return;
690
691         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
692                 active = &(tz->trips.active[i]);
693                 if (!active || !active->flags.valid)
694                         break;
695                 if (tz->temperature >= active->temperature) {
696                         /*
697                          * Above Threshold?
698                          * ----------------
699                          * If not already enabled, turn ON all cooling devices
700                          * associated with this active threshold.
701                          */
702                         if (active->temperature > maxtemp)
703                                 tz->state.active_index = i;
704                         maxtemp = active->temperature;
705                         if (active->flags.enabled)
706                                 continue;
707                         for (j = 0; j < active->devices.count; j++) {
708                                 result =
709                                     acpi_bus_set_power(active->devices.
710                                                        handles[j],
711                                                        ACPI_STATE_D0);
712                                 if (result) {
713                                         printk(KERN_WARNING PREFIX
714                                                       "Unable to turn cooling device [%p] 'on'\n",
715                                                       active->devices.
716                                                       handles[j]);
717                                         continue;
718                                 }
719                                 active->flags.enabled = 1;
720                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
721                                                   "Cooling device [%p] now 'on'\n",
722                                                   active->devices.handles[j]));
723                         }
724                         continue;
725                 }
726                 if (!active->flags.enabled)
727                         continue;
728                 /*
729                  * Below Threshold?
730                  * ----------------
731                  * Turn OFF all cooling devices associated with this
732                  * threshold.
733                  */
734                 for (j = 0; j < active->devices.count; j++) {
735                         result = acpi_bus_set_power(active->devices.handles[j],
736                                                     ACPI_STATE_D3);
737                         if (result) {
738                                 printk(KERN_WARNING PREFIX
739                                               "Unable to turn cooling device [%p] 'off'\n",
740                                               active->devices.handles[j]);
741                                 continue;
742                         }
743                         active->flags.enabled = 0;
744                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
745                                           "Cooling device [%p] now 'off'\n",
746                                           active->devices.handles[j]));
747                 }
748         }
749 }
750
751 static void acpi_thermal_check(void *context);
752
753 static void acpi_thermal_run(unsigned long data)
754 {
755         struct acpi_thermal *tz = (struct acpi_thermal *)data;
756         if (!tz->zombie)
757                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
758 }
759
760 static void acpi_thermal_check(void *data)
761 {
762         int result = 0;
763         struct acpi_thermal *tz = data;
764         unsigned long sleep_time = 0;
765         unsigned long timeout_jiffies = 0;
766         int i = 0;
767         struct acpi_thermal_state state;
768
769
770         if (!tz) {
771                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
772                 return;
773         }
774
775         /* Check if someone else is already running */
776         if (!mutex_trylock(&tz->lock))
777                 return;
778
779         state = tz->state;
780
781         result = acpi_thermal_get_temperature(tz);
782         if (result)
783                 goto unlock;
784
785         if (!tz->tz_enabled)
786                 goto unlock;
787
788         memset(&tz->state, 0, sizeof(tz->state));
789
790         /*
791          * Check Trip Points
792          * -----------------
793          * Compare the current temperature to the trip point values to see
794          * if we've entered one of the thermal policy states.  Note that
795          * this function determines when a state is entered, but the 
796          * individual policy decides when it is exited (e.g. hysteresis).
797          */
798         if (tz->trips.critical.flags.valid)
799                 state.critical |=
800                     (tz->temperature >= tz->trips.critical.temperature);
801         if (tz->trips.hot.flags.valid)
802                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
803         if (tz->trips.passive.flags.valid)
804                 state.passive |=
805                     (tz->temperature >= tz->trips.passive.temperature);
806         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
807                 if (tz->trips.active[i].flags.valid)
808                         state.active |=
809                             (tz->temperature >=
810                              tz->trips.active[i].temperature);
811
812         /*
813          * Invoke Policy
814          * -------------
815          * Separated from the above check to allow individual policy to 
816          * determine when to exit a given state.
817          */
818         if (state.critical)
819                 acpi_thermal_critical(tz);
820         if (state.hot)
821                 acpi_thermal_hot(tz);
822         if (state.passive)
823                 acpi_thermal_passive(tz);
824         if (state.active)
825                 acpi_thermal_active(tz);
826
827         /*
828          * Calculate State
829          * ---------------
830          * Again, separated from the above two to allow independent policy
831          * decisions.
832          */
833         tz->state.critical = tz->trips.critical.flags.enabled;
834         tz->state.hot = tz->trips.hot.flags.enabled;
835         tz->state.passive = tz->trips.passive.flags.enabled;
836         tz->state.active = 0;
837         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
838                 tz->state.active |= tz->trips.active[i].flags.enabled;
839
840         /*
841          * Calculate Sleep Time
842          * --------------------
843          * If we're in the passive state, use _TSP's value.  Otherwise
844          * use the default polling frequency (e.g. _TZP).  If no polling
845          * frequency is specified then we'll wait forever (at least until
846          * a thermal event occurs).  Note that _TSP and _TZD values are
847          * given in 1/10th seconds (we must covert to milliseconds).
848          */
849         if (tz->state.passive) {
850                 sleep_time = tz->trips.passive.tsp * 100;
851                 timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
852         } else if (tz->polling_frequency > 0) {
853                 sleep_time = tz->polling_frequency * 100;
854                 timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
855         }
856
857         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
858                           tz->name, tz->temperature, sleep_time));
859
860         /*
861          * Schedule Next Poll
862          * ------------------
863          */
864         if (!sleep_time) {
865                 if (timer_pending(&(tz->timer)))
866                         del_timer(&(tz->timer));
867         } else {
868                 if (timer_pending(&(tz->timer)))
869                         mod_timer(&(tz->timer), timeout_jiffies);
870                 else {
871                         tz->timer.data = (unsigned long)tz;
872                         tz->timer.function = acpi_thermal_run;
873                         tz->timer.expires = timeout_jiffies;
874                         add_timer(&(tz->timer));
875                 }
876         }
877       unlock:
878         mutex_unlock(&tz->lock);
879 }
880
881 /* sys I/F for generic thermal sysfs support */
882 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
883
884 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
885 {
886         struct acpi_thermal *tz = thermal->devdata;
887
888         if (!tz)
889                 return -EINVAL;
890
891         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature));
892 }
893
894 static const char enabled[] = "kernel";
895 static const char disabled[] = "user";
896 static int thermal_get_mode(struct thermal_zone_device *thermal,
897                                 char *buf)
898 {
899         struct acpi_thermal *tz = thermal->devdata;
900
901         if (!tz)
902                 return -EINVAL;
903
904         return sprintf(buf, "%s\n", tz->tz_enabled ?
905                         enabled : disabled);
906 }
907
908 static int thermal_set_mode(struct thermal_zone_device *thermal,
909                                 const char *buf)
910 {
911         struct acpi_thermal *tz = thermal->devdata;
912         int enable;
913
914         if (!tz)
915                 return -EINVAL;
916
917         /*
918          * enable/disable thermal management from ACPI thermal driver
919          */
920         if (!strncmp(buf, enabled, sizeof enabled - 1))
921                 enable = 1;
922         else if (!strncmp(buf, disabled, sizeof disabled - 1))
923                 enable = 0;
924         else
925                 return -EINVAL;
926
927         if (enable != tz->tz_enabled) {
928                 tz->tz_enabled = enable;
929                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
930                         "%s ACPI thermal control\n",
931                         tz->tz_enabled ? enabled : disabled));
932                 acpi_thermal_check(tz);
933         }
934         return 0;
935 }
936
937 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
938                                  int trip, char *buf)
939 {
940         struct acpi_thermal *tz = thermal->devdata;
941         int i;
942
943         if (!tz || trip < 0)
944                 return -EINVAL;
945
946         if (tz->trips.critical.flags.valid) {
947                 if (!trip)
948                         return sprintf(buf, "critical\n");
949                 trip--;
950         }
951
952         if (tz->trips.hot.flags.valid) {
953                 if (!trip)
954                         return sprintf(buf, "hot\n");
955                 trip--;
956         }
957
958         if (tz->trips.passive.flags.valid) {
959                 if (!trip)
960                         return sprintf(buf, "passive\n");
961                 trip--;
962         }
963
964         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
965                 tz->trips.active[i].flags.valid; i++) {
966                 if (!trip)
967                         return sprintf(buf, "active%d\n", i);
968                 trip--;
969         }
970
971         return -EINVAL;
972 }
973
974 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
975                                  int trip, char *buf)
976 {
977         struct acpi_thermal *tz = thermal->devdata;
978         int i;
979
980         if (!tz || trip < 0)
981                 return -EINVAL;
982
983         if (tz->trips.critical.flags.valid) {
984                 if (!trip)
985                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
986                                 tz->trips.critical.temperature));
987                 trip--;
988         }
989
990         if (tz->trips.hot.flags.valid) {
991                 if (!trip)
992                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
993                                         tz->trips.hot.temperature));
994                 trip--;
995         }
996
997         if (tz->trips.passive.flags.valid) {
998                 if (!trip)
999                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1000                                         tz->trips.passive.temperature));
1001                 trip--;
1002         }
1003
1004         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1005                 tz->trips.active[i].flags.valid; i++) {
1006                 if (!trip)
1007                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1008                                         tz->trips.active[i].temperature));
1009                 trip--;
1010         }
1011
1012         return -EINVAL;
1013 }
1014
1015 typedef int (*cb)(struct thermal_zone_device *, int,
1016                   struct thermal_cooling_device *);
1017 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
1018                                         struct thermal_cooling_device *cdev,
1019                                         cb action)
1020 {
1021         struct acpi_device *device = cdev->devdata;
1022         struct acpi_thermal *tz = thermal->devdata;
1023         struct acpi_device *dev;
1024         acpi_status status;
1025         acpi_handle handle;
1026         int i;
1027         int j;
1028         int trip = -1;
1029         int result = 0;
1030
1031         if (tz->trips.critical.flags.valid)
1032                 trip++;
1033
1034         if (tz->trips.hot.flags.valid)
1035                 trip++;
1036
1037         if (tz->trips.passive.flags.valid) {
1038                 trip++;
1039                 for (i = 0; i < tz->trips.passive.devices.count;
1040                     i++) {
1041                         handle = tz->trips.passive.devices.handles[i];
1042                         status = acpi_bus_get_device(handle, &dev);
1043                         if (ACPI_SUCCESS(status) && (dev == device)) {
1044                                 result = action(thermal, trip, cdev);
1045                                 if (result)
1046                                         goto failed;
1047                         }
1048                 }
1049         }
1050
1051         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1052                 if (!tz->trips.active[i].flags.valid)
1053                         break;
1054                 trip++;
1055                 for (j = 0;
1056                     j < tz->trips.active[i].devices.count;
1057                     j++) {
1058                         handle = tz->trips.active[i].devices.handles[j];
1059                         status = acpi_bus_get_device(handle, &dev);
1060                         if (ACPI_SUCCESS(status) && (dev == device)) {
1061                                 result = action(thermal, trip, cdev);
1062                                 if (result)
1063                                         goto failed;
1064                         }
1065                 }
1066         }
1067
1068         for (i = 0; i < tz->devices.count; i++) {
1069                 handle = tz->devices.handles[i];
1070                 status = acpi_bus_get_device(handle, &dev);
1071                 if (ACPI_SUCCESS(status) && (dev == device)) {
1072                         result = action(thermal, -1, cdev);
1073                         if (result)
1074                                 goto failed;
1075                 }
1076         }
1077
1078 failed:
1079         return result;
1080 }
1081
1082 static int
1083 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1084                                         struct thermal_cooling_device *cdev)
1085 {
1086         return acpi_thermal_cooling_device_cb(thermal, cdev,
1087                                 thermal_zone_bind_cooling_device);
1088 }
1089
1090 static int
1091 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
1092                                         struct thermal_cooling_device *cdev)
1093 {
1094         return acpi_thermal_cooling_device_cb(thermal, cdev,
1095                                 thermal_zone_unbind_cooling_device);
1096 }
1097
1098 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1099         .bind = acpi_thermal_bind_cooling_device,
1100         .unbind = acpi_thermal_unbind_cooling_device,
1101         .get_temp = thermal_get_temp,
1102         .get_mode = thermal_get_mode,
1103         .set_mode = thermal_set_mode,
1104         .get_trip_type = thermal_get_trip_type,
1105         .get_trip_temp = thermal_get_trip_temp,
1106 };
1107
1108 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1109 {
1110         int trips = 0;
1111         int result;
1112         acpi_status status;
1113         int i;
1114
1115         if (tz->trips.critical.flags.valid)
1116                 trips++;
1117
1118         if (tz->trips.hot.flags.valid)
1119                 trips++;
1120
1121         if (tz->trips.passive.flags.valid)
1122                 trips++;
1123
1124         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1125                         tz->trips.active[i].flags.valid; i++, trips++);
1126         tz->thermal_zone = thermal_zone_device_register("ACPI thermal zone",
1127                                         trips, tz, &acpi_thermal_zone_ops);
1128         if (IS_ERR(tz->thermal_zone))
1129                 return -ENODEV;
1130
1131         result = sysfs_create_link(&tz->device->dev.kobj,
1132                                    &tz->thermal_zone->device.kobj, "thermal_zone");
1133         if (result)
1134                 return result;
1135
1136         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1137                                    &tz->device->dev.kobj, "device");
1138         if (result)
1139                 return result;
1140
1141         status = acpi_attach_data(tz->device->handle,
1142                                   acpi_bus_private_data_handler,
1143                                   tz->thermal_zone);
1144         if (ACPI_FAILURE(status)) {
1145                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1146                                 "Error attaching device data\n"));
1147                 return -ENODEV;
1148         }
1149
1150         tz->tz_enabled = 1;
1151
1152         printk(KERN_INFO PREFIX "%s is registered as thermal_zone%d\n",
1153                         tz->device->dev.bus_id, tz->thermal_zone->id);
1154         return 0;
1155 }
1156
1157 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1158 {
1159         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1160         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1161         thermal_zone_device_unregister(tz->thermal_zone);
1162         tz->thermal_zone = NULL;
1163         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
1164 }
1165
1166
1167 /* --------------------------------------------------------------------------
1168                               FS Interface (/proc)
1169    -------------------------------------------------------------------------- */
1170
1171 static struct proc_dir_entry *acpi_thermal_dir;
1172
1173 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1174 {
1175         struct acpi_thermal *tz = seq->private;
1176
1177
1178         if (!tz)
1179                 goto end;
1180
1181         seq_puts(seq, "state:                   ");
1182
1183         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1184             && !tz->state.active)
1185                 seq_puts(seq, "ok\n");
1186         else {
1187                 if (tz->state.critical)
1188                         seq_puts(seq, "critical ");
1189                 if (tz->state.hot)
1190                         seq_puts(seq, "hot ");
1191                 if (tz->state.passive)
1192                         seq_puts(seq, "passive ");
1193                 if (tz->state.active)
1194                         seq_printf(seq, "active[%d]", tz->state.active_index);
1195                 seq_puts(seq, "\n");
1196         }
1197
1198       end:
1199         return 0;
1200 }
1201
1202 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1203 {
1204         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1205 }
1206
1207 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1208 {
1209         int result = 0;
1210         struct acpi_thermal *tz = seq->private;
1211
1212
1213         if (!tz)
1214                 goto end;
1215
1216         result = acpi_thermal_get_temperature(tz);
1217         if (result)
1218                 goto end;
1219
1220         seq_printf(seq, "temperature:             %ld C\n",
1221                    KELVIN_TO_CELSIUS(tz->temperature));
1222
1223       end:
1224         return 0;
1225 }
1226
1227 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1228 {
1229         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1230 }
1231
1232 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1233 {
1234         struct acpi_thermal *tz = seq->private;
1235         struct acpi_device *device;
1236         acpi_status status;
1237
1238         int i = 0;
1239         int j = 0;
1240
1241
1242         if (!tz)
1243                 goto end;
1244
1245         if (tz->trips.critical.flags.valid)
1246                 seq_printf(seq, "critical (S5):           %ld C%s",
1247                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1248                            nocrt ? " <disabled>\n" : "\n");
1249
1250         if (tz->trips.hot.flags.valid)
1251                 seq_printf(seq, "hot (S4):                %ld C%s",
1252                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1253                            nocrt ? " <disabled>\n" : "\n");
1254
1255         if (tz->trips.passive.flags.valid) {
1256                 seq_printf(seq,
1257                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1258                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1259                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1260                            tz->trips.passive.tsp);
1261                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1262                         status = acpi_bus_get_device(tz->trips.passive.devices.
1263                                                      handles[j], &device);
1264                         seq_printf(seq, "%4.4s ", status ? "" :
1265                                    acpi_device_bid(device));
1266                 }
1267                 seq_puts(seq, "\n");
1268         }
1269
1270         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1271                 if (!(tz->trips.active[i].flags.valid))
1272                         break;
1273                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1274                            i,
1275                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1276                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1277                         status = acpi_bus_get_device(tz->trips.active[i].
1278                                                      devices.handles[j],
1279                                                      &device);
1280                         seq_printf(seq, "%4.4s ", status ? "" :
1281                                    acpi_device_bid(device));
1282                 }
1283                 seq_puts(seq, "\n");
1284         }
1285
1286       end:
1287         return 0;
1288 }
1289
1290 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1291 {
1292         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1293 }
1294
1295 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1296 {
1297         struct acpi_thermal *tz = seq->private;
1298
1299
1300         if (!tz)
1301                 goto end;
1302
1303         if (!tz->flags.cooling_mode)
1304                 seq_puts(seq, "<setting not supported>\n");
1305         else
1306                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1307
1308       end:
1309         return 0;
1310 }
1311
1312 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1313 {
1314         return single_open(file, acpi_thermal_cooling_seq_show,
1315                            PDE(inode)->data);
1316 }
1317
1318 static ssize_t
1319 acpi_thermal_write_cooling_mode(struct file *file,
1320                                 const char __user * buffer,
1321                                 size_t count, loff_t * ppos)
1322 {
1323         struct seq_file *m = file->private_data;
1324         struct acpi_thermal *tz = m->private;
1325         int result = 0;
1326         char mode_string[12] = { '\0' };
1327
1328
1329         if (!tz || (count > sizeof(mode_string) - 1))
1330                 return -EINVAL;
1331
1332         if (!tz->flags.cooling_mode)
1333                 return -ENODEV;
1334
1335         if (copy_from_user(mode_string, buffer, count))
1336                 return -EFAULT;
1337
1338         mode_string[count] = '\0';
1339
1340         result = acpi_thermal_set_cooling_mode(tz,
1341                                                simple_strtoul(mode_string, NULL,
1342                                                               0));
1343         if (result)
1344                 return result;
1345
1346         acpi_thermal_check(tz);
1347
1348         return count;
1349 }
1350
1351 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1352 {
1353         struct acpi_thermal *tz = seq->private;
1354
1355
1356         if (!tz)
1357                 goto end;
1358
1359         if (!tz->polling_frequency) {
1360                 seq_puts(seq, "<polling disabled>\n");
1361                 goto end;
1362         }
1363
1364         seq_printf(seq, "polling frequency:       %lu seconds\n",
1365                    (tz->polling_frequency / 10));
1366
1367       end:
1368         return 0;
1369 }
1370
1371 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1372 {
1373         return single_open(file, acpi_thermal_polling_seq_show,
1374                            PDE(inode)->data);
1375 }
1376
1377 static ssize_t
1378 acpi_thermal_write_polling(struct file *file,
1379                            const char __user * buffer,
1380                            size_t count, loff_t * ppos)
1381 {
1382         struct seq_file *m = file->private_data;
1383         struct acpi_thermal *tz = m->private;
1384         int result = 0;
1385         char polling_string[12] = { '\0' };
1386         int seconds = 0;
1387
1388
1389         if (!tz || (count > sizeof(polling_string) - 1))
1390                 return -EINVAL;
1391
1392         if (copy_from_user(polling_string, buffer, count))
1393                 return -EFAULT;
1394
1395         polling_string[count] = '\0';
1396
1397         seconds = simple_strtoul(polling_string, NULL, 0);
1398
1399         result = acpi_thermal_set_polling(tz, seconds);
1400         if (result)
1401                 return result;
1402
1403         acpi_thermal_check(tz);
1404
1405         return count;
1406 }
1407
1408 static int acpi_thermal_add_fs(struct acpi_device *device)
1409 {
1410         struct proc_dir_entry *entry = NULL;
1411
1412
1413         if (!acpi_device_dir(device)) {
1414                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1415                                                      acpi_thermal_dir);
1416                 if (!acpi_device_dir(device))
1417                         return -ENODEV;
1418                 acpi_device_dir(device)->owner = THIS_MODULE;
1419         }
1420
1421         /* 'state' [R] */
1422         entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
1423                                   S_IRUGO, acpi_device_dir(device));
1424         if (!entry)
1425                 return -ENODEV;
1426         else {
1427                 entry->proc_fops = &acpi_thermal_state_fops;
1428                 entry->data = acpi_driver_data(device);
1429                 entry->owner = THIS_MODULE;
1430         }
1431
1432         /* 'temperature' [R] */
1433         entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1434                                   S_IRUGO, acpi_device_dir(device));
1435         if (!entry)
1436                 return -ENODEV;
1437         else {
1438                 entry->proc_fops = &acpi_thermal_temp_fops;
1439                 entry->data = acpi_driver_data(device);
1440                 entry->owner = THIS_MODULE;
1441         }
1442
1443         /* 'trip_points' [R] */
1444         entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1445                                   S_IRUGO,
1446                                   acpi_device_dir(device));
1447         if (!entry)
1448                 return -ENODEV;
1449         else {
1450                 entry->proc_fops = &acpi_thermal_trip_fops;
1451                 entry->data = acpi_driver_data(device);
1452                 entry->owner = THIS_MODULE;
1453         }
1454
1455         /* 'cooling_mode' [R/W] */
1456         entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1457                                   S_IFREG | S_IRUGO | S_IWUSR,
1458                                   acpi_device_dir(device));
1459         if (!entry)
1460                 return -ENODEV;
1461         else {
1462                 entry->proc_fops = &acpi_thermal_cooling_fops;
1463                 entry->data = acpi_driver_data(device);
1464                 entry->owner = THIS_MODULE;
1465         }
1466
1467         /* 'polling_frequency' [R/W] */
1468         entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1469                                   S_IFREG | S_IRUGO | S_IWUSR,
1470                                   acpi_device_dir(device));
1471         if (!entry)
1472                 return -ENODEV;
1473         else {
1474                 entry->proc_fops = &acpi_thermal_polling_fops;
1475                 entry->data = acpi_driver_data(device);
1476                 entry->owner = THIS_MODULE;
1477         }
1478
1479         return 0;
1480 }
1481
1482 static int acpi_thermal_remove_fs(struct acpi_device *device)
1483 {
1484
1485         if (acpi_device_dir(device)) {
1486                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1487                                   acpi_device_dir(device));
1488                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1489                                   acpi_device_dir(device));
1490                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1491                                   acpi_device_dir(device));
1492                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1493                                   acpi_device_dir(device));
1494                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1495                                   acpi_device_dir(device));
1496                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1497                 acpi_device_dir(device) = NULL;
1498         }
1499
1500         return 0;
1501 }
1502
1503 /* --------------------------------------------------------------------------
1504                                  Driver Interface
1505    -------------------------------------------------------------------------- */
1506
1507 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1508 {
1509         struct acpi_thermal *tz = data;
1510         struct acpi_device *device = NULL;
1511
1512
1513         if (!tz)
1514                 return;
1515
1516         device = tz->device;
1517
1518         switch (event) {
1519         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1520                 acpi_thermal_check(tz);
1521                 break;
1522         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1523                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1524                 acpi_thermal_check(tz);
1525                 acpi_bus_generate_proc_event(device, event, 0);
1526                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1527                                                   device->dev.bus_id, event, 0);
1528                 break;
1529         case ACPI_THERMAL_NOTIFY_DEVICES:
1530                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1531                 acpi_thermal_check(tz);
1532                 acpi_bus_generate_proc_event(device, event, 0);
1533                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1534                                                   device->dev.bus_id, event, 0);
1535                 break;
1536         default:
1537                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1538                                   "Unsupported event [0x%x]\n", event));
1539                 break;
1540         }
1541
1542         return;
1543 }
1544
1545 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1546 {
1547         int result = 0;
1548
1549
1550         if (!tz)
1551                 return -EINVAL;
1552
1553         /* Get temperature [_TMP] (required) */
1554         result = acpi_thermal_get_temperature(tz);
1555         if (result)
1556                 return result;
1557
1558         /* Get trip points [_CRT, _PSV, etc.] (required) */
1559         result = acpi_thermal_get_trip_points(tz);
1560         if (result)
1561                 return result;
1562
1563         /* Set the cooling mode [_SCP] to active cooling (default) */
1564         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1565         if (!result)
1566                 tz->flags.cooling_mode = 1;
1567
1568         /* Get default polling frequency [_TZP] (optional) */
1569         if (tzp)
1570                 tz->polling_frequency = tzp;
1571         else
1572                 acpi_thermal_get_polling_frequency(tz);
1573
1574         return 0;
1575 }
1576
1577 static int acpi_thermal_add(struct acpi_device *device)
1578 {
1579         int result = 0;
1580         acpi_status status = AE_OK;
1581         struct acpi_thermal *tz = NULL;
1582
1583
1584         if (!device)
1585                 return -EINVAL;
1586
1587         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1588         if (!tz)
1589                 return -ENOMEM;
1590
1591         tz->device = device;
1592         strcpy(tz->name, device->pnp.bus_id);
1593         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1594         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1595         acpi_driver_data(device) = tz;
1596         mutex_init(&tz->lock);
1597
1598
1599         result = acpi_thermal_get_info(tz);
1600         if (result)
1601                 goto free_memory;
1602
1603         result = acpi_thermal_register_thermal_zone(tz);
1604         if (result)
1605                 goto free_memory;
1606
1607         result = acpi_thermal_add_fs(device);
1608         if (result)
1609                 goto unregister_thermal_zone;
1610
1611         init_timer(&tz->timer);
1612
1613         acpi_thermal_check(tz);
1614
1615         status = acpi_install_notify_handler(device->handle,
1616                                              ACPI_DEVICE_NOTIFY,
1617                                              acpi_thermal_notify, tz);
1618         if (ACPI_FAILURE(status)) {
1619                 result = -ENODEV;
1620                 goto remove_fs;
1621         }
1622
1623         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1624                acpi_device_name(device), acpi_device_bid(device),
1625                KELVIN_TO_CELSIUS(tz->temperature));
1626         goto end;
1627
1628 remove_fs:
1629         acpi_thermal_remove_fs(device);
1630 unregister_thermal_zone:
1631         thermal_zone_device_unregister(tz->thermal_zone);
1632 free_memory:
1633         kfree(tz);
1634 end:
1635         return result;
1636 }
1637
1638 static int acpi_thermal_remove(struct acpi_device *device, int type)
1639 {
1640         acpi_status status = AE_OK;
1641         struct acpi_thermal *tz = NULL;
1642
1643
1644         if (!device || !acpi_driver_data(device))
1645                 return -EINVAL;
1646
1647         tz = acpi_driver_data(device);
1648
1649         /* avoid timer adding new defer task */
1650         tz->zombie = 1;
1651         /* wait for running timer (on other CPUs) finish */
1652         del_timer_sync(&(tz->timer));
1653         /* synchronize deferred task */
1654         acpi_os_wait_events_complete(NULL);
1655         /* deferred task may reinsert timer */
1656         del_timer_sync(&(tz->timer));
1657
1658         status = acpi_remove_notify_handler(device->handle,
1659                                             ACPI_DEVICE_NOTIFY,
1660                                             acpi_thermal_notify);
1661
1662         /* Terminate policy */
1663         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1664                 tz->trips.passive.flags.enabled = 0;
1665                 acpi_thermal_passive(tz);
1666         }
1667         if (tz->trips.active[0].flags.valid
1668             && tz->trips.active[0].flags.enabled) {
1669                 tz->trips.active[0].flags.enabled = 0;
1670                 acpi_thermal_active(tz);
1671         }
1672
1673         acpi_thermal_remove_fs(device);
1674         acpi_thermal_unregister_thermal_zone(tz);
1675         mutex_destroy(&tz->lock);
1676         kfree(tz);
1677         return 0;
1678 }
1679
1680 static int acpi_thermal_resume(struct acpi_device *device)
1681 {
1682         struct acpi_thermal *tz = NULL;
1683         int i, j, power_state, result;
1684
1685
1686         if (!device || !acpi_driver_data(device))
1687                 return -EINVAL;
1688
1689         tz = acpi_driver_data(device);
1690
1691         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1692                 if (!(&tz->trips.active[i]))
1693                         break;
1694                 if (!tz->trips.active[i].flags.valid)
1695                         break;
1696                 tz->trips.active[i].flags.enabled = 1;
1697                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1698                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1699                             handles[j], &power_state);
1700                         if (result || (power_state != ACPI_STATE_D0)) {
1701                                 tz->trips.active[i].flags.enabled = 0;
1702                                 break;
1703                         }
1704                 }
1705                 tz->state.active |= tz->trips.active[i].flags.enabled;
1706         }
1707
1708         acpi_thermal_check(tz);
1709
1710         return AE_OK;
1711 }
1712
1713 static int thermal_act(const struct dmi_system_id *d) {
1714
1715         if (act == 0) {
1716                 printk(KERN_NOTICE "ACPI: %s detected: "
1717                         "disabling all active thermal trip points\n", d->ident);
1718                 act = -1;
1719         }
1720         return 0;
1721 }
1722 static int thermal_nocrt(const struct dmi_system_id *d) {
1723
1724         printk(KERN_NOTICE "ACPI: %s detected: "
1725                 "disabling all critical thermal trip point actions.\n", d->ident);
1726         nocrt = 1;
1727         return 0;
1728 }
1729 static int thermal_tzp(const struct dmi_system_id *d) {
1730
1731         if (tzp == 0) {
1732                 printk(KERN_NOTICE "ACPI: %s detected: "
1733                         "enabling thermal zone polling\n", d->ident);
1734                 tzp = 300;      /* 300 dS = 30 Seconds */
1735         }
1736         return 0;
1737 }
1738 static int thermal_psv(const struct dmi_system_id *d) {
1739
1740         if (psv == 0) {
1741                 printk(KERN_NOTICE "ACPI: %s detected: "
1742                         "disabling all passive thermal trip points\n", d->ident);
1743                 psv = -1;
1744         }
1745         return 0;
1746 }
1747
1748 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1749         /*
1750          * Award BIOS on this AOpen makes thermal control almost worthless.
1751          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1752          */
1753         {
1754          .callback = thermal_act,
1755          .ident = "AOpen i915GMm-HFS",
1756          .matches = {
1757                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1758                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1759                 },
1760         },
1761         {
1762          .callback = thermal_psv,
1763          .ident = "AOpen i915GMm-HFS",
1764          .matches = {
1765                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1766                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1767                 },
1768         },
1769         {
1770          .callback = thermal_tzp,
1771          .ident = "AOpen i915GMm-HFS",
1772          .matches = {
1773                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1774                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1775                 },
1776         },
1777         {
1778          .callback = thermal_nocrt,
1779          .ident = "Gigabyte GA-7ZX",
1780          .matches = {
1781                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1782                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1783                 },
1784         },
1785         {}
1786 };
1787
1788 static int __init acpi_thermal_init(void)
1789 {
1790         int result = 0;
1791
1792         dmi_check_system(thermal_dmi_table);
1793
1794         if (off) {
1795                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1796                 return -ENODEV;
1797         }
1798         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1799         if (!acpi_thermal_dir)
1800                 return -ENODEV;
1801         acpi_thermal_dir->owner = THIS_MODULE;
1802
1803         result = acpi_bus_register_driver(&acpi_thermal_driver);
1804         if (result < 0) {
1805                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1806                 return -ENODEV;
1807         }
1808
1809         return 0;
1810 }
1811
1812 static void __exit acpi_thermal_exit(void)
1813 {
1814
1815         acpi_bus_unregister_driver(&acpi_thermal_driver);
1816
1817         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1818
1819         return;
1820 }
1821
1822 module_init(acpi_thermal_init);
1823 module_exit(acpi_thermal_exit);