acpi: use non-racy method for proc entries creation
[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         .owner = THIS_MODULE,
202         .open = acpi_thermal_state_open_fs,
203         .read = seq_read,
204         .llseek = seq_lseek,
205         .release = single_release,
206 };
207
208 static const struct file_operations acpi_thermal_temp_fops = {
209         .owner = THIS_MODULE,
210         .open = acpi_thermal_temp_open_fs,
211         .read = seq_read,
212         .llseek = seq_lseek,
213         .release = single_release,
214 };
215
216 static const struct file_operations acpi_thermal_trip_fops = {
217         .owner = THIS_MODULE,
218         .open = acpi_thermal_trip_open_fs,
219         .read = seq_read,
220         .llseek = seq_lseek,
221         .release = single_release,
222 };
223
224 static const struct file_operations acpi_thermal_cooling_fops = {
225         .owner = THIS_MODULE,
226         .open = acpi_thermal_cooling_open_fs,
227         .read = seq_read,
228         .write = acpi_thermal_write_cooling_mode,
229         .llseek = seq_lseek,
230         .release = single_release,
231 };
232
233 static const struct file_operations acpi_thermal_polling_fops = {
234         .owner = THIS_MODULE,
235         .open = acpi_thermal_polling_open_fs,
236         .read = seq_read,
237         .write = acpi_thermal_write_polling,
238         .llseek = seq_lseek,
239         .release = single_release,
240 };
241
242 /* --------------------------------------------------------------------------
243                              Thermal Zone Management
244    -------------------------------------------------------------------------- */
245
246 static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
247 {
248         acpi_status status = AE_OK;
249
250
251         if (!tz)
252                 return -EINVAL;
253
254         tz->last_temperature = tz->temperature;
255
256         status =
257             acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
258         if (ACPI_FAILURE(status))
259                 return -ENODEV;
260
261         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
262                           tz->temperature));
263
264         return 0;
265 }
266
267 static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
268 {
269         acpi_status status = AE_OK;
270
271
272         if (!tz)
273                 return -EINVAL;
274
275         status =
276             acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
277                                   &tz->polling_frequency);
278         if (ACPI_FAILURE(status))
279                 return -ENODEV;
280
281         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
282                           tz->polling_frequency));
283
284         return 0;
285 }
286
287 static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
288 {
289
290         if (!tz)
291                 return -EINVAL;
292
293         tz->polling_frequency = seconds * 10;   /* Convert value to deci-seconds */
294
295         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
296                           "Polling frequency set to %lu seconds\n",
297                           tz->polling_frequency/10));
298
299         return 0;
300 }
301
302 static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
303 {
304         acpi_status status = AE_OK;
305         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
306         struct acpi_object_list arg_list = { 1, &arg0 };
307         acpi_handle handle = NULL;
308
309
310         if (!tz)
311                 return -EINVAL;
312
313         status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
314         if (ACPI_FAILURE(status)) {
315                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
316                 return -ENODEV;
317         }
318
319         arg0.integer.value = mode;
320
321         status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
322         if (ACPI_FAILURE(status))
323                 return -ENODEV;
324
325         return 0;
326 }
327
328 #define ACPI_TRIPS_CRITICAL     0x01
329 #define ACPI_TRIPS_HOT          0x02
330 #define ACPI_TRIPS_PASSIVE      0x04
331 #define ACPI_TRIPS_ACTIVE       0x08
332 #define ACPI_TRIPS_DEVICES      0x10
333
334 #define ACPI_TRIPS_REFRESH_THRESHOLDS   (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
335 #define ACPI_TRIPS_REFRESH_DEVICES      ACPI_TRIPS_DEVICES
336
337 #define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |    \
338                               ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |  \
339                               ACPI_TRIPS_DEVICES)
340
341 /*
342  * This exception is thrown out in two cases:
343  * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
344  *   when re-evaluating the AML code.
345  * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
346  *   We need to re-bind the cooling devices of a thermal zone when this occurs.
347  */
348 #define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)        \
349 do {    \
350         if (flags != ACPI_TRIPS_INIT)   \
351                 ACPI_EXCEPTION((AE_INFO, AE_ERROR,      \
352                 "ACPI thermal trip point %s changed\n"  \
353                 "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
354 } while (0)
355
356 static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
357 {
358         acpi_status status = AE_OK;
359         struct acpi_handle_list devices;
360         int valid = 0;
361         int i;
362
363         /* Critical Shutdown (required) */
364         if (flag & ACPI_TRIPS_CRITICAL) {
365                 status = acpi_evaluate_integer(tz->device->handle,
366                                 "_CRT", NULL, &tz->trips.critical.temperature);
367                 if (ACPI_FAILURE(status)) {
368                         tz->trips.critical.flags.valid = 0;
369                         ACPI_EXCEPTION((AE_INFO, status,
370                                         "No critical threshold"));
371                         return -ENODEV;
372                 } else {
373                         tz->trips.critical.flags.valid = 1;
374                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
375                                         "Found critical threshold [%lu]\n",
376                                         tz->trips.critical.temperature));
377                 }
378                 if (tz->trips.critical.flags.valid == 1) {
379                         if (crt == -1) {
380                                 tz->trips.critical.flags.valid = 0;
381                         } else if (crt > 0) {
382                                 unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
383                                 /*
384                                  * Allow override to lower critical threshold
385                                  */
386                                 if (crt_k < tz->trips.critical.temperature)
387                                         tz->trips.critical.temperature = crt_k;
388                         }
389                 }
390         }
391
392         /* Critical Sleep (optional) */
393         if (flag & ACPI_TRIPS_HOT) {
394                 status = acpi_evaluate_integer(tz->device->handle,
395                                 "_HOT", NULL, &tz->trips.hot.temperature);
396                 if (ACPI_FAILURE(status)) {
397                         tz->trips.hot.flags.valid = 0;
398                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
399                                         "No hot threshold\n"));
400                 } else {
401                         tz->trips.hot.flags.valid = 1;
402                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
403                                         "Found hot threshold [%lu]\n",
404                                         tz->trips.critical.temperature));
405                 }
406         }
407
408         /* Passive (optional) */
409         if (flag & ACPI_TRIPS_PASSIVE) {
410                 valid = tz->trips.passive.flags.valid;
411                 if (psv == -1) {
412                         status = AE_SUPPORT;
413                 } else if (psv > 0) {
414                         tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
415                         status = AE_OK;
416                 } else {
417                         status = acpi_evaluate_integer(tz->device->handle,
418                                 "_PSV", NULL, &tz->trips.passive.temperature);
419                 }
420
421                 if (ACPI_FAILURE(status))
422                         tz->trips.passive.flags.valid = 0;
423                 else {
424                         tz->trips.passive.flags.valid = 1;
425                         if (flag == ACPI_TRIPS_INIT) {
426                                 status = acpi_evaluate_integer(
427                                                 tz->device->handle, "_TC1",
428                                                 NULL, &tz->trips.passive.tc1);
429                                 if (ACPI_FAILURE(status))
430                                         tz->trips.passive.flags.valid = 0;
431                                 status = acpi_evaluate_integer(
432                                                 tz->device->handle, "_TC2",
433                                                 NULL, &tz->trips.passive.tc2);
434                                 if (ACPI_FAILURE(status))
435                                         tz->trips.passive.flags.valid = 0;
436                                 status = acpi_evaluate_integer(
437                                                 tz->device->handle, "_TSP",
438                                                 NULL, &tz->trips.passive.tsp);
439                                 if (ACPI_FAILURE(status))
440                                         tz->trips.passive.flags.valid = 0;
441                         }
442                 }
443         }
444         if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
445                 memset(&devices, 0, sizeof(struct acpi_handle_list));
446                 status = acpi_evaluate_reference(tz->device->handle, "_PSL",
447                                                         NULL, &devices);
448                 if (ACPI_FAILURE(status))
449                         tz->trips.passive.flags.valid = 0;
450                 else
451                         tz->trips.passive.flags.valid = 1;
452
453                 if (memcmp(&tz->trips.passive.devices, &devices,
454                                 sizeof(struct acpi_handle_list))) {
455                         memcpy(&tz->trips.passive.devices, &devices,
456                                 sizeof(struct acpi_handle_list));
457                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
458                 }
459         }
460         if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
461                 if (valid != tz->trips.passive.flags.valid)
462                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
463         }
464
465         /* Active (optional) */
466         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
467                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
468                 valid = tz->trips.active[i].flags.valid;
469
470                 if (act == -1)
471                         break; /* disable all active trip points */
472
473                 if (flag & ACPI_TRIPS_ACTIVE) {
474                         status = acpi_evaluate_integer(tz->device->handle,
475                                 name, NULL, &tz->trips.active[i].temperature);
476                         if (ACPI_FAILURE(status)) {
477                                 tz->trips.active[i].flags.valid = 0;
478                                 if (i == 0)
479                                         break;
480                                 if (act <= 0)
481                                         break;
482                                 if (i == 1)
483                                         tz->trips.active[0].temperature =
484                                                 CELSIUS_TO_KELVIN(act);
485                                 else
486                                         /*
487                                          * Don't allow override higher than
488                                          * the next higher trip point
489                                          */
490                                         tz->trips.active[i - 1].temperature =
491                                                 (tz->trips.active[i - 2].temperature <
492                                                 CELSIUS_TO_KELVIN(act) ?
493                                                 tz->trips.active[i - 2].temperature :
494                                                 CELSIUS_TO_KELVIN(act));
495                                 break;
496                         } else
497                                 tz->trips.active[i].flags.valid = 1;
498                 }
499
500                 name[2] = 'L';
501                 if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
502                         memset(&devices, 0, sizeof(struct acpi_handle_list));
503                         status = acpi_evaluate_reference(tz->device->handle,
504                                                 name, NULL, &devices);
505                         if (ACPI_FAILURE(status))
506                                 tz->trips.active[i].flags.valid = 0;
507                         else
508                                 tz->trips.active[i].flags.valid = 1;
509
510                         if (memcmp(&tz->trips.active[i].devices, &devices,
511                                         sizeof(struct acpi_handle_list))) {
512                                 memcpy(&tz->trips.active[i].devices, &devices,
513                                         sizeof(struct acpi_handle_list));
514                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
515                         }
516                 }
517                 if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
518                         if (valid != tz->trips.active[i].flags.valid)
519                                 ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
520
521                 if (!tz->trips.active[i].flags.valid)
522                         break;
523         }
524
525         if (flag & ACPI_TRIPS_DEVICES) {
526                 memset(&devices, 0, sizeof(struct acpi_handle_list));
527                 status = acpi_evaluate_reference(tz->device->handle, "_TZD",
528                                                 NULL, &devices);
529                 if (memcmp(&tz->devices, &devices,
530                                 sizeof(struct acpi_handle_list))) {
531                         memcpy(&tz->devices, &devices,
532                                 sizeof(struct acpi_handle_list));
533                         ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
534                 }
535         }
536
537         return 0;
538 }
539
540 static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
541 {
542         return acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
543 }
544
545 static int acpi_thermal_critical(struct acpi_thermal *tz)
546 {
547         if (!tz || !tz->trips.critical.flags.valid)
548                 return -EINVAL;
549
550         if (tz->temperature >= tz->trips.critical.temperature) {
551                 printk(KERN_WARNING PREFIX "Critical trip point\n");
552                 tz->trips.critical.flags.enabled = 1;
553         } else if (tz->trips.critical.flags.enabled)
554                 tz->trips.critical.flags.enabled = 0;
555
556         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
557                                 tz->trips.critical.flags.enabled);
558         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
559                                           tz->device->dev.bus_id,
560                                           ACPI_THERMAL_NOTIFY_CRITICAL,
561                                           tz->trips.critical.flags.enabled);
562
563         /* take no action if nocrt is set */
564         if(!nocrt) {
565                 printk(KERN_EMERG
566                         "Critical temperature reached (%ld C), shutting down.\n",
567                         KELVIN_TO_CELSIUS(tz->temperature));
568                 orderly_poweroff(true);
569         }
570
571         return 0;
572 }
573
574 static int acpi_thermal_hot(struct acpi_thermal *tz)
575 {
576         if (!tz || !tz->trips.hot.flags.valid)
577                 return -EINVAL;
578
579         if (tz->temperature >= tz->trips.hot.temperature) {
580                 printk(KERN_WARNING PREFIX "Hot trip point\n");
581                 tz->trips.hot.flags.enabled = 1;
582         } else if (tz->trips.hot.flags.enabled)
583                 tz->trips.hot.flags.enabled = 0;
584
585         acpi_bus_generate_proc_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
586                                 tz->trips.hot.flags.enabled);
587         acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
588                                           tz->device->dev.bus_id,
589                                           ACPI_THERMAL_NOTIFY_HOT,
590                                           tz->trips.hot.flags.enabled);
591
592         /* TBD: Call user-mode "sleep(S4)" function if nocrt is cleared */
593
594         return 0;
595 }
596
597 static void acpi_thermal_passive(struct acpi_thermal *tz)
598 {
599         int result = 1;
600         struct acpi_thermal_passive *passive = NULL;
601         int trend = 0;
602         int i = 0;
603
604
605         if (!tz || !tz->trips.passive.flags.valid)
606                 return;
607
608         passive = &(tz->trips.passive);
609
610         /*
611          * Above Trip?
612          * -----------
613          * Calculate the thermal trend (using the passive cooling equation)
614          * and modify the performance limit for all passive cooling devices
615          * accordingly.  Note that we assume symmetry.
616          */
617         if (tz->temperature >= passive->temperature) {
618                 trend =
619                     (passive->tc1 * (tz->temperature - tz->last_temperature)) +
620                     (passive->tc2 * (tz->temperature - passive->temperature));
621                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
622                                   "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
623                                   trend, passive->tc1, tz->temperature,
624                                   tz->last_temperature, passive->tc2,
625                                   tz->temperature, passive->temperature));
626                 passive->flags.enabled = 1;
627                 /* Heating up? */
628                 if (trend > 0)
629                         for (i = 0; i < passive->devices.count; i++)
630                                 acpi_processor_set_thermal_limit(passive->
631                                                                  devices.
632                                                                  handles[i],
633                                                                  ACPI_PROCESSOR_LIMIT_INCREMENT);
634                 /* Cooling off? */
635                 else if (trend < 0) {
636                         for (i = 0; i < passive->devices.count; i++)
637                                 /*
638                                  * assume that we are on highest
639                                  * freq/lowest thrott and can leave
640                                  * passive mode, even in error case
641                                  */
642                                 if (!acpi_processor_set_thermal_limit
643                                     (passive->devices.handles[i],
644                                      ACPI_PROCESSOR_LIMIT_DECREMENT))
645                                         result = 0;
646                         /*
647                          * Leave cooling mode, even if the temp might
648                          * higher than trip point This is because some
649                          * machines might have long thermal polling
650                          * frequencies (tsp) defined. We will fall back
651                          * into passive mode in next cycle (probably quicker)
652                          */
653                         if (result) {
654                                 passive->flags.enabled = 0;
655                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
656                                                   "Disabling passive cooling, still above threshold,"
657                                                   " but we are cooling down\n"));
658                         }
659                 }
660                 return;
661         }
662
663         /*
664          * Below Trip?
665          * -----------
666          * Implement passive cooling hysteresis to slowly increase performance
667          * and avoid thrashing around the passive trip point.  Note that we
668          * assume symmetry.
669          */
670         if (!passive->flags.enabled)
671                 return;
672         for (i = 0; i < passive->devices.count; i++)
673                 if (!acpi_processor_set_thermal_limit
674                     (passive->devices.handles[i],
675                      ACPI_PROCESSOR_LIMIT_DECREMENT))
676                         result = 0;
677         if (result) {
678                 passive->flags.enabled = 0;
679                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
680                                   "Disabling passive cooling (zone is cool)\n"));
681         }
682 }
683
684 static void acpi_thermal_active(struct acpi_thermal *tz)
685 {
686         int result = 0;
687         struct acpi_thermal_active *active = NULL;
688         int i = 0;
689         int j = 0;
690         unsigned long maxtemp = 0;
691
692
693         if (!tz)
694                 return;
695
696         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
697                 active = &(tz->trips.active[i]);
698                 if (!active || !active->flags.valid)
699                         break;
700                 if (tz->temperature >= active->temperature) {
701                         /*
702                          * Above Threshold?
703                          * ----------------
704                          * If not already enabled, turn ON all cooling devices
705                          * associated with this active threshold.
706                          */
707                         if (active->temperature > maxtemp)
708                                 tz->state.active_index = i;
709                         maxtemp = active->temperature;
710                         if (active->flags.enabled)
711                                 continue;
712                         for (j = 0; j < active->devices.count; j++) {
713                                 result =
714                                     acpi_bus_set_power(active->devices.
715                                                        handles[j],
716                                                        ACPI_STATE_D0);
717                                 if (result) {
718                                         printk(KERN_WARNING PREFIX
719                                                       "Unable to turn cooling device [%p] 'on'\n",
720                                                       active->devices.
721                                                       handles[j]);
722                                         continue;
723                                 }
724                                 active->flags.enabled = 1;
725                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
726                                                   "Cooling device [%p] now 'on'\n",
727                                                   active->devices.handles[j]));
728                         }
729                         continue;
730                 }
731                 if (!active->flags.enabled)
732                         continue;
733                 /*
734                  * Below Threshold?
735                  * ----------------
736                  * Turn OFF all cooling devices associated with this
737                  * threshold.
738                  */
739                 for (j = 0; j < active->devices.count; j++) {
740                         result = acpi_bus_set_power(active->devices.handles[j],
741                                                     ACPI_STATE_D3);
742                         if (result) {
743                                 printk(KERN_WARNING PREFIX
744                                               "Unable to turn cooling device [%p] 'off'\n",
745                                               active->devices.handles[j]);
746                                 continue;
747                         }
748                         active->flags.enabled = 0;
749                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
750                                           "Cooling device [%p] now 'off'\n",
751                                           active->devices.handles[j]));
752                 }
753         }
754 }
755
756 static void acpi_thermal_check(void *context);
757
758 static void acpi_thermal_run(unsigned long data)
759 {
760         struct acpi_thermal *tz = (struct acpi_thermal *)data;
761         if (!tz->zombie)
762                 acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
763 }
764
765 static void acpi_thermal_check(void *data)
766 {
767         int result = 0;
768         struct acpi_thermal *tz = data;
769         unsigned long sleep_time = 0;
770         unsigned long timeout_jiffies = 0;
771         int i = 0;
772         struct acpi_thermal_state state;
773
774
775         if (!tz) {
776                 printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
777                 return;
778         }
779
780         /* Check if someone else is already running */
781         if (!mutex_trylock(&tz->lock))
782                 return;
783
784         state = tz->state;
785
786         result = acpi_thermal_get_temperature(tz);
787         if (result)
788                 goto unlock;
789
790         if (!tz->tz_enabled)
791                 goto unlock;
792
793         memset(&tz->state, 0, sizeof(tz->state));
794
795         /*
796          * Check Trip Points
797          * -----------------
798          * Compare the current temperature to the trip point values to see
799          * if we've entered one of the thermal policy states.  Note that
800          * this function determines when a state is entered, but the 
801          * individual policy decides when it is exited (e.g. hysteresis).
802          */
803         if (tz->trips.critical.flags.valid)
804                 state.critical |=
805                     (tz->temperature >= tz->trips.critical.temperature);
806         if (tz->trips.hot.flags.valid)
807                 state.hot |= (tz->temperature >= tz->trips.hot.temperature);
808         if (tz->trips.passive.flags.valid)
809                 state.passive |=
810                     (tz->temperature >= tz->trips.passive.temperature);
811         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
812                 if (tz->trips.active[i].flags.valid)
813                         state.active |=
814                             (tz->temperature >=
815                              tz->trips.active[i].temperature);
816
817         /*
818          * Invoke Policy
819          * -------------
820          * Separated from the above check to allow individual policy to 
821          * determine when to exit a given state.
822          */
823         if (state.critical)
824                 acpi_thermal_critical(tz);
825         if (state.hot)
826                 acpi_thermal_hot(tz);
827         if (state.passive)
828                 acpi_thermal_passive(tz);
829         if (state.active)
830                 acpi_thermal_active(tz);
831
832         /*
833          * Calculate State
834          * ---------------
835          * Again, separated from the above two to allow independent policy
836          * decisions.
837          */
838         tz->state.critical = tz->trips.critical.flags.enabled;
839         tz->state.hot = tz->trips.hot.flags.enabled;
840         tz->state.passive = tz->trips.passive.flags.enabled;
841         tz->state.active = 0;
842         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
843                 tz->state.active |= tz->trips.active[i].flags.enabled;
844
845         /*
846          * Calculate Sleep Time
847          * --------------------
848          * If we're in the passive state, use _TSP's value.  Otherwise
849          * use the default polling frequency (e.g. _TZP).  If no polling
850          * frequency is specified then we'll wait forever (at least until
851          * a thermal event occurs).  Note that _TSP and _TZD values are
852          * given in 1/10th seconds (we must covert to milliseconds).
853          */
854         if (tz->state.passive) {
855                 sleep_time = tz->trips.passive.tsp * 100;
856                 timeout_jiffies =  jiffies + (HZ * sleep_time) / 1000;
857         } else if (tz->polling_frequency > 0) {
858                 sleep_time = tz->polling_frequency * 100;
859                 timeout_jiffies =  round_jiffies(jiffies + (HZ * sleep_time) / 1000);
860         }
861
862         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
863                           tz->name, tz->temperature, sleep_time));
864
865         /*
866          * Schedule Next Poll
867          * ------------------
868          */
869         if (!sleep_time) {
870                 if (timer_pending(&(tz->timer)))
871                         del_timer(&(tz->timer));
872         } else {
873                 if (timer_pending(&(tz->timer)))
874                         mod_timer(&(tz->timer), timeout_jiffies);
875                 else {
876                         tz->timer.data = (unsigned long)tz;
877                         tz->timer.function = acpi_thermal_run;
878                         tz->timer.expires = timeout_jiffies;
879                         add_timer(&(tz->timer));
880                 }
881         }
882       unlock:
883         mutex_unlock(&tz->lock);
884 }
885
886 /* sys I/F for generic thermal sysfs support */
887 #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
888
889 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
890 {
891         struct acpi_thermal *tz = thermal->devdata;
892
893         if (!tz)
894                 return -EINVAL;
895
896         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature));
897 }
898
899 static const char enabled[] = "kernel";
900 static const char disabled[] = "user";
901 static int thermal_get_mode(struct thermal_zone_device *thermal,
902                                 char *buf)
903 {
904         struct acpi_thermal *tz = thermal->devdata;
905
906         if (!tz)
907                 return -EINVAL;
908
909         return sprintf(buf, "%s\n", tz->tz_enabled ?
910                         enabled : disabled);
911 }
912
913 static int thermal_set_mode(struct thermal_zone_device *thermal,
914                                 const char *buf)
915 {
916         struct acpi_thermal *tz = thermal->devdata;
917         int enable;
918
919         if (!tz)
920                 return -EINVAL;
921
922         /*
923          * enable/disable thermal management from ACPI thermal driver
924          */
925         if (!strncmp(buf, enabled, sizeof enabled - 1))
926                 enable = 1;
927         else if (!strncmp(buf, disabled, sizeof disabled - 1))
928                 enable = 0;
929         else
930                 return -EINVAL;
931
932         if (enable != tz->tz_enabled) {
933                 tz->tz_enabled = enable;
934                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
935                         "%s ACPI thermal control\n",
936                         tz->tz_enabled ? enabled : disabled));
937                 acpi_thermal_check(tz);
938         }
939         return 0;
940 }
941
942 static int thermal_get_trip_type(struct thermal_zone_device *thermal,
943                                  int trip, char *buf)
944 {
945         struct acpi_thermal *tz = thermal->devdata;
946         int i;
947
948         if (!tz || trip < 0)
949                 return -EINVAL;
950
951         if (tz->trips.critical.flags.valid) {
952                 if (!trip)
953                         return sprintf(buf, "critical\n");
954                 trip--;
955         }
956
957         if (tz->trips.hot.flags.valid) {
958                 if (!trip)
959                         return sprintf(buf, "hot\n");
960                 trip--;
961         }
962
963         if (tz->trips.passive.flags.valid) {
964                 if (!trip)
965                         return sprintf(buf, "passive\n");
966                 trip--;
967         }
968
969         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
970                 tz->trips.active[i].flags.valid; i++) {
971                 if (!trip)
972                         return sprintf(buf, "active%d\n", i);
973                 trip--;
974         }
975
976         return -EINVAL;
977 }
978
979 static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
980                                  int trip, char *buf)
981 {
982         struct acpi_thermal *tz = thermal->devdata;
983         int i;
984
985         if (!tz || trip < 0)
986                 return -EINVAL;
987
988         if (tz->trips.critical.flags.valid) {
989                 if (!trip)
990                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
991                                 tz->trips.critical.temperature));
992                 trip--;
993         }
994
995         if (tz->trips.hot.flags.valid) {
996                 if (!trip)
997                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
998                                         tz->trips.hot.temperature));
999                 trip--;
1000         }
1001
1002         if (tz->trips.passive.flags.valid) {
1003                 if (!trip)
1004                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1005                                         tz->trips.passive.temperature));
1006                 trip--;
1007         }
1008
1009         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1010                 tz->trips.active[i].flags.valid; i++) {
1011                 if (!trip)
1012                         return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(
1013                                         tz->trips.active[i].temperature));
1014                 trip--;
1015         }
1016
1017         return -EINVAL;
1018 }
1019
1020 typedef int (*cb)(struct thermal_zone_device *, int,
1021                   struct thermal_cooling_device *);
1022 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
1023                                         struct thermal_cooling_device *cdev,
1024                                         cb action)
1025 {
1026         struct acpi_device *device = cdev->devdata;
1027         struct acpi_thermal *tz = thermal->devdata;
1028         struct acpi_device *dev;
1029         acpi_status status;
1030         acpi_handle handle;
1031         int i;
1032         int j;
1033         int trip = -1;
1034         int result = 0;
1035
1036         if (tz->trips.critical.flags.valid)
1037                 trip++;
1038
1039         if (tz->trips.hot.flags.valid)
1040                 trip++;
1041
1042         if (tz->trips.passive.flags.valid) {
1043                 trip++;
1044                 for (i = 0; i < tz->trips.passive.devices.count;
1045                     i++) {
1046                         handle = tz->trips.passive.devices.handles[i];
1047                         status = acpi_bus_get_device(handle, &dev);
1048                         if (ACPI_SUCCESS(status) && (dev == device)) {
1049                                 result = action(thermal, trip, cdev);
1050                                 if (result)
1051                                         goto failed;
1052                         }
1053                 }
1054         }
1055
1056         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1057                 if (!tz->trips.active[i].flags.valid)
1058                         break;
1059                 trip++;
1060                 for (j = 0;
1061                     j < tz->trips.active[i].devices.count;
1062                     j++) {
1063                         handle = tz->trips.active[i].devices.handles[j];
1064                         status = acpi_bus_get_device(handle, &dev);
1065                         if (ACPI_SUCCESS(status) && (dev == device)) {
1066                                 result = action(thermal, trip, cdev);
1067                                 if (result)
1068                                         goto failed;
1069                         }
1070                 }
1071         }
1072
1073         for (i = 0; i < tz->devices.count; i++) {
1074                 handle = tz->devices.handles[i];
1075                 status = acpi_bus_get_device(handle, &dev);
1076                 if (ACPI_SUCCESS(status) && (dev == device)) {
1077                         result = action(thermal, -1, cdev);
1078                         if (result)
1079                                 goto failed;
1080                 }
1081         }
1082
1083 failed:
1084         return result;
1085 }
1086
1087 static int
1088 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
1089                                         struct thermal_cooling_device *cdev)
1090 {
1091         return acpi_thermal_cooling_device_cb(thermal, cdev,
1092                                 thermal_zone_bind_cooling_device);
1093 }
1094
1095 static int
1096 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
1097                                         struct thermal_cooling_device *cdev)
1098 {
1099         return acpi_thermal_cooling_device_cb(thermal, cdev,
1100                                 thermal_zone_unbind_cooling_device);
1101 }
1102
1103 static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
1104         .bind = acpi_thermal_bind_cooling_device,
1105         .unbind = acpi_thermal_unbind_cooling_device,
1106         .get_temp = thermal_get_temp,
1107         .get_mode = thermal_get_mode,
1108         .set_mode = thermal_set_mode,
1109         .get_trip_type = thermal_get_trip_type,
1110         .get_trip_temp = thermal_get_trip_temp,
1111 };
1112
1113 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
1114 {
1115         int trips = 0;
1116         int result;
1117         acpi_status status;
1118         int i;
1119
1120         if (tz->trips.critical.flags.valid)
1121                 trips++;
1122
1123         if (tz->trips.hot.flags.valid)
1124                 trips++;
1125
1126         if (tz->trips.passive.flags.valid)
1127                 trips++;
1128
1129         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
1130                         tz->trips.active[i].flags.valid; i++, trips++);
1131         tz->thermal_zone = thermal_zone_device_register("ACPI thermal zone",
1132                                         trips, tz, &acpi_thermal_zone_ops);
1133         if (IS_ERR(tz->thermal_zone))
1134                 return -ENODEV;
1135
1136         result = sysfs_create_link(&tz->device->dev.kobj,
1137                                    &tz->thermal_zone->device.kobj, "thermal_zone");
1138         if (result)
1139                 return result;
1140
1141         result = sysfs_create_link(&tz->thermal_zone->device.kobj,
1142                                    &tz->device->dev.kobj, "device");
1143         if (result)
1144                 return result;
1145
1146         status = acpi_attach_data(tz->device->handle,
1147                                   acpi_bus_private_data_handler,
1148                                   tz->thermal_zone);
1149         if (ACPI_FAILURE(status)) {
1150                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1151                                 "Error attaching device data\n"));
1152                 return -ENODEV;
1153         }
1154
1155         tz->tz_enabled = 1;
1156
1157         printk(KERN_INFO PREFIX "%s is registered as thermal_zone%d\n",
1158                         tz->device->dev.bus_id, tz->thermal_zone->id);
1159         return 0;
1160 }
1161
1162 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
1163 {
1164         sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
1165         sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
1166         thermal_zone_device_unregister(tz->thermal_zone);
1167         tz->thermal_zone = NULL;
1168         acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
1169 }
1170
1171
1172 /* --------------------------------------------------------------------------
1173                               FS Interface (/proc)
1174    -------------------------------------------------------------------------- */
1175
1176 static struct proc_dir_entry *acpi_thermal_dir;
1177
1178 static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
1179 {
1180         struct acpi_thermal *tz = seq->private;
1181
1182
1183         if (!tz)
1184                 goto end;
1185
1186         seq_puts(seq, "state:                   ");
1187
1188         if (!tz->state.critical && !tz->state.hot && !tz->state.passive
1189             && !tz->state.active)
1190                 seq_puts(seq, "ok\n");
1191         else {
1192                 if (tz->state.critical)
1193                         seq_puts(seq, "critical ");
1194                 if (tz->state.hot)
1195                         seq_puts(seq, "hot ");
1196                 if (tz->state.passive)
1197                         seq_puts(seq, "passive ");
1198                 if (tz->state.active)
1199                         seq_printf(seq, "active[%d]", tz->state.active_index);
1200                 seq_puts(seq, "\n");
1201         }
1202
1203       end:
1204         return 0;
1205 }
1206
1207 static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
1208 {
1209         return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
1210 }
1211
1212 static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
1213 {
1214         int result = 0;
1215         struct acpi_thermal *tz = seq->private;
1216
1217
1218         if (!tz)
1219                 goto end;
1220
1221         result = acpi_thermal_get_temperature(tz);
1222         if (result)
1223                 goto end;
1224
1225         seq_printf(seq, "temperature:             %ld C\n",
1226                    KELVIN_TO_CELSIUS(tz->temperature));
1227
1228       end:
1229         return 0;
1230 }
1231
1232 static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
1233 {
1234         return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
1235 }
1236
1237 static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
1238 {
1239         struct acpi_thermal *tz = seq->private;
1240         struct acpi_device *device;
1241         acpi_status status;
1242
1243         int i = 0;
1244         int j = 0;
1245
1246
1247         if (!tz)
1248                 goto end;
1249
1250         if (tz->trips.critical.flags.valid)
1251                 seq_printf(seq, "critical (S5):           %ld C%s",
1252                            KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
1253                            nocrt ? " <disabled>\n" : "\n");
1254
1255         if (tz->trips.hot.flags.valid)
1256                 seq_printf(seq, "hot (S4):                %ld C%s",
1257                            KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
1258                            nocrt ? " <disabled>\n" : "\n");
1259
1260         if (tz->trips.passive.flags.valid) {
1261                 seq_printf(seq,
1262                            "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
1263                            KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
1264                            tz->trips.passive.tc1, tz->trips.passive.tc2,
1265                            tz->trips.passive.tsp);
1266                 for (j = 0; j < tz->trips.passive.devices.count; j++) {
1267                         status = acpi_bus_get_device(tz->trips.passive.devices.
1268                                                      handles[j], &device);
1269                         seq_printf(seq, "%4.4s ", status ? "" :
1270                                    acpi_device_bid(device));
1271                 }
1272                 seq_puts(seq, "\n");
1273         }
1274
1275         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1276                 if (!(tz->trips.active[i].flags.valid))
1277                         break;
1278                 seq_printf(seq, "active[%d]:               %ld C: devices=",
1279                            i,
1280                            KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
1281                 for (j = 0; j < tz->trips.active[i].devices.count; j++){
1282                         status = acpi_bus_get_device(tz->trips.active[i].
1283                                                      devices.handles[j],
1284                                                      &device);
1285                         seq_printf(seq, "%4.4s ", status ? "" :
1286                                    acpi_device_bid(device));
1287                 }
1288                 seq_puts(seq, "\n");
1289         }
1290
1291       end:
1292         return 0;
1293 }
1294
1295 static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
1296 {
1297         return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
1298 }
1299
1300 static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
1301 {
1302         struct acpi_thermal *tz = seq->private;
1303
1304
1305         if (!tz)
1306                 goto end;
1307
1308         if (!tz->flags.cooling_mode)
1309                 seq_puts(seq, "<setting not supported>\n");
1310         else
1311                 seq_puts(seq, "0 - Active; 1 - Passive\n");
1312
1313       end:
1314         return 0;
1315 }
1316
1317 static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
1318 {
1319         return single_open(file, acpi_thermal_cooling_seq_show,
1320                            PDE(inode)->data);
1321 }
1322
1323 static ssize_t
1324 acpi_thermal_write_cooling_mode(struct file *file,
1325                                 const char __user * buffer,
1326                                 size_t count, loff_t * ppos)
1327 {
1328         struct seq_file *m = file->private_data;
1329         struct acpi_thermal *tz = m->private;
1330         int result = 0;
1331         char mode_string[12] = { '\0' };
1332
1333
1334         if (!tz || (count > sizeof(mode_string) - 1))
1335                 return -EINVAL;
1336
1337         if (!tz->flags.cooling_mode)
1338                 return -ENODEV;
1339
1340         if (copy_from_user(mode_string, buffer, count))
1341                 return -EFAULT;
1342
1343         mode_string[count] = '\0';
1344
1345         result = acpi_thermal_set_cooling_mode(tz,
1346                                                simple_strtoul(mode_string, NULL,
1347                                                               0));
1348         if (result)
1349                 return result;
1350
1351         acpi_thermal_check(tz);
1352
1353         return count;
1354 }
1355
1356 static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
1357 {
1358         struct acpi_thermal *tz = seq->private;
1359
1360
1361         if (!tz)
1362                 goto end;
1363
1364         if (!tz->polling_frequency) {
1365                 seq_puts(seq, "<polling disabled>\n");
1366                 goto end;
1367         }
1368
1369         seq_printf(seq, "polling frequency:       %lu seconds\n",
1370                    (tz->polling_frequency / 10));
1371
1372       end:
1373         return 0;
1374 }
1375
1376 static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
1377 {
1378         return single_open(file, acpi_thermal_polling_seq_show,
1379                            PDE(inode)->data);
1380 }
1381
1382 static ssize_t
1383 acpi_thermal_write_polling(struct file *file,
1384                            const char __user * buffer,
1385                            size_t count, loff_t * ppos)
1386 {
1387         struct seq_file *m = file->private_data;
1388         struct acpi_thermal *tz = m->private;
1389         int result = 0;
1390         char polling_string[12] = { '\0' };
1391         int seconds = 0;
1392
1393
1394         if (!tz || (count > sizeof(polling_string) - 1))
1395                 return -EINVAL;
1396
1397         if (copy_from_user(polling_string, buffer, count))
1398                 return -EFAULT;
1399
1400         polling_string[count] = '\0';
1401
1402         seconds = simple_strtoul(polling_string, NULL, 0);
1403
1404         result = acpi_thermal_set_polling(tz, seconds);
1405         if (result)
1406                 return result;
1407
1408         acpi_thermal_check(tz);
1409
1410         return count;
1411 }
1412
1413 static int acpi_thermal_add_fs(struct acpi_device *device)
1414 {
1415         struct proc_dir_entry *entry = NULL;
1416
1417
1418         if (!acpi_device_dir(device)) {
1419                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1420                                                      acpi_thermal_dir);
1421                 if (!acpi_device_dir(device))
1422                         return -ENODEV;
1423                 acpi_device_dir(device)->owner = THIS_MODULE;
1424         }
1425
1426         /* 'state' [R] */
1427         entry = proc_create_data(ACPI_THERMAL_FILE_STATE,
1428                                  S_IRUGO, acpi_device_dir(device),
1429                                  &acpi_thermal_state_fops,
1430                                  acpi_driver_data(device));
1431         if (!entry)
1432                 return -ENODEV;
1433
1434         /* 'temperature' [R] */
1435         entry = proc_create_data(ACPI_THERMAL_FILE_TEMPERATURE,
1436                                  S_IRUGO, acpi_device_dir(device),
1437                                  &acpi_thermal_temp_fops,
1438                                  acpi_driver_data(device));
1439         if (!entry)
1440                 return -ENODEV;
1441
1442         /* 'trip_points' [R] */
1443         entry = proc_create_data(ACPI_THERMAL_FILE_TRIP_POINTS,
1444                                  S_IRUGO,
1445                                  acpi_device_dir(device),
1446                                  &acpi_thermal_trip_fops,
1447                                  acpi_driver_data(device));
1448         if (!entry)
1449                 return -ENODEV;
1450
1451         /* 'cooling_mode' [R/W] */
1452         entry = proc_create_data(ACPI_THERMAL_FILE_COOLING_MODE,
1453                                  S_IFREG | S_IRUGO | S_IWUSR,
1454                                  acpi_device_dir(device),
1455                                  &acpi_thermal_cooling_fops,
1456                                  acpi_driver_data(device));
1457         if (!entry)
1458                 return -ENODEV;
1459
1460         /* 'polling_frequency' [R/W] */
1461         entry = proc_create_data(ACPI_THERMAL_FILE_POLLING_FREQ,
1462                                  S_IFREG | S_IRUGO | S_IWUSR,
1463                                  acpi_device_dir(device),
1464                                  &acpi_thermal_polling_fops,
1465                                  acpi_driver_data(device));
1466         if (!entry)
1467                 return -ENODEV;
1468         return 0;
1469 }
1470
1471 static int acpi_thermal_remove_fs(struct acpi_device *device)
1472 {
1473
1474         if (acpi_device_dir(device)) {
1475                 remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
1476                                   acpi_device_dir(device));
1477                 remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
1478                                   acpi_device_dir(device));
1479                 remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
1480                                   acpi_device_dir(device));
1481                 remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
1482                                   acpi_device_dir(device));
1483                 remove_proc_entry(ACPI_THERMAL_FILE_STATE,
1484                                   acpi_device_dir(device));
1485                 remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
1486                 acpi_device_dir(device) = NULL;
1487         }
1488
1489         return 0;
1490 }
1491
1492 /* --------------------------------------------------------------------------
1493                                  Driver Interface
1494    -------------------------------------------------------------------------- */
1495
1496 static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
1497 {
1498         struct acpi_thermal *tz = data;
1499         struct acpi_device *device = NULL;
1500
1501
1502         if (!tz)
1503                 return;
1504
1505         device = tz->device;
1506
1507         switch (event) {
1508         case ACPI_THERMAL_NOTIFY_TEMPERATURE:
1509                 acpi_thermal_check(tz);
1510                 break;
1511         case ACPI_THERMAL_NOTIFY_THRESHOLDS:
1512                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
1513                 acpi_thermal_check(tz);
1514                 acpi_bus_generate_proc_event(device, event, 0);
1515                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1516                                                   device->dev.bus_id, event, 0);
1517                 break;
1518         case ACPI_THERMAL_NOTIFY_DEVICES:
1519                 acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
1520                 acpi_thermal_check(tz);
1521                 acpi_bus_generate_proc_event(device, event, 0);
1522                 acpi_bus_generate_netlink_event(device->pnp.device_class,
1523                                                   device->dev.bus_id, event, 0);
1524                 break;
1525         default:
1526                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1527                                   "Unsupported event [0x%x]\n", event));
1528                 break;
1529         }
1530
1531         return;
1532 }
1533
1534 static int acpi_thermal_get_info(struct acpi_thermal *tz)
1535 {
1536         int result = 0;
1537
1538
1539         if (!tz)
1540                 return -EINVAL;
1541
1542         /* Get temperature [_TMP] (required) */
1543         result = acpi_thermal_get_temperature(tz);
1544         if (result)
1545                 return result;
1546
1547         /* Get trip points [_CRT, _PSV, etc.] (required) */
1548         result = acpi_thermal_get_trip_points(tz);
1549         if (result)
1550                 return result;
1551
1552         /* Set the cooling mode [_SCP] to active cooling (default) */
1553         result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1554         if (!result)
1555                 tz->flags.cooling_mode = 1;
1556
1557         /* Get default polling frequency [_TZP] (optional) */
1558         if (tzp)
1559                 tz->polling_frequency = tzp;
1560         else
1561                 acpi_thermal_get_polling_frequency(tz);
1562
1563         return 0;
1564 }
1565
1566 static int acpi_thermal_add(struct acpi_device *device)
1567 {
1568         int result = 0;
1569         acpi_status status = AE_OK;
1570         struct acpi_thermal *tz = NULL;
1571
1572
1573         if (!device)
1574                 return -EINVAL;
1575
1576         tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1577         if (!tz)
1578                 return -ENOMEM;
1579
1580         tz->device = device;
1581         strcpy(tz->name, device->pnp.bus_id);
1582         strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1583         strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1584         acpi_driver_data(device) = tz;
1585         mutex_init(&tz->lock);
1586
1587
1588         result = acpi_thermal_get_info(tz);
1589         if (result)
1590                 goto free_memory;
1591
1592         result = acpi_thermal_register_thermal_zone(tz);
1593         if (result)
1594                 goto free_memory;
1595
1596         result = acpi_thermal_add_fs(device);
1597         if (result)
1598                 goto unregister_thermal_zone;
1599
1600         init_timer(&tz->timer);
1601
1602         acpi_thermal_check(tz);
1603
1604         status = acpi_install_notify_handler(device->handle,
1605                                              ACPI_DEVICE_NOTIFY,
1606                                              acpi_thermal_notify, tz);
1607         if (ACPI_FAILURE(status)) {
1608                 result = -ENODEV;
1609                 goto remove_fs;
1610         }
1611
1612         printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1613                acpi_device_name(device), acpi_device_bid(device),
1614                KELVIN_TO_CELSIUS(tz->temperature));
1615         goto end;
1616
1617 remove_fs:
1618         acpi_thermal_remove_fs(device);
1619 unregister_thermal_zone:
1620         thermal_zone_device_unregister(tz->thermal_zone);
1621 free_memory:
1622         kfree(tz);
1623 end:
1624         return result;
1625 }
1626
1627 static int acpi_thermal_remove(struct acpi_device *device, int type)
1628 {
1629         acpi_status status = AE_OK;
1630         struct acpi_thermal *tz = NULL;
1631
1632
1633         if (!device || !acpi_driver_data(device))
1634                 return -EINVAL;
1635
1636         tz = acpi_driver_data(device);
1637
1638         /* avoid timer adding new defer task */
1639         tz->zombie = 1;
1640         /* wait for running timer (on other CPUs) finish */
1641         del_timer_sync(&(tz->timer));
1642         /* synchronize deferred task */
1643         acpi_os_wait_events_complete(NULL);
1644         /* deferred task may reinsert timer */
1645         del_timer_sync(&(tz->timer));
1646
1647         status = acpi_remove_notify_handler(device->handle,
1648                                             ACPI_DEVICE_NOTIFY,
1649                                             acpi_thermal_notify);
1650
1651         /* Terminate policy */
1652         if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
1653                 tz->trips.passive.flags.enabled = 0;
1654                 acpi_thermal_passive(tz);
1655         }
1656         if (tz->trips.active[0].flags.valid
1657             && tz->trips.active[0].flags.enabled) {
1658                 tz->trips.active[0].flags.enabled = 0;
1659                 acpi_thermal_active(tz);
1660         }
1661
1662         acpi_thermal_remove_fs(device);
1663         acpi_thermal_unregister_thermal_zone(tz);
1664         mutex_destroy(&tz->lock);
1665         kfree(tz);
1666         return 0;
1667 }
1668
1669 static int acpi_thermal_resume(struct acpi_device *device)
1670 {
1671         struct acpi_thermal *tz = NULL;
1672         int i, j, power_state, result;
1673
1674
1675         if (!device || !acpi_driver_data(device))
1676                 return -EINVAL;
1677
1678         tz = acpi_driver_data(device);
1679
1680         for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1681                 if (!(&tz->trips.active[i]))
1682                         break;
1683                 if (!tz->trips.active[i].flags.valid)
1684                         break;
1685                 tz->trips.active[i].flags.enabled = 1;
1686                 for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1687                         result = acpi_bus_get_power(tz->trips.active[i].devices.
1688                             handles[j], &power_state);
1689                         if (result || (power_state != ACPI_STATE_D0)) {
1690                                 tz->trips.active[i].flags.enabled = 0;
1691                                 break;
1692                         }
1693                 }
1694                 tz->state.active |= tz->trips.active[i].flags.enabled;
1695         }
1696
1697         acpi_thermal_check(tz);
1698
1699         return AE_OK;
1700 }
1701
1702 static int thermal_act(const struct dmi_system_id *d) {
1703
1704         if (act == 0) {
1705                 printk(KERN_NOTICE "ACPI: %s detected: "
1706                         "disabling all active thermal trip points\n", d->ident);
1707                 act = -1;
1708         }
1709         return 0;
1710 }
1711 static int thermal_nocrt(const struct dmi_system_id *d) {
1712
1713         printk(KERN_NOTICE "ACPI: %s detected: "
1714                 "disabling all critical thermal trip point actions.\n", d->ident);
1715         nocrt = 1;
1716         return 0;
1717 }
1718 static int thermal_tzp(const struct dmi_system_id *d) {
1719
1720         if (tzp == 0) {
1721                 printk(KERN_NOTICE "ACPI: %s detected: "
1722                         "enabling thermal zone polling\n", d->ident);
1723                 tzp = 300;      /* 300 dS = 30 Seconds */
1724         }
1725         return 0;
1726 }
1727 static int thermal_psv(const struct dmi_system_id *d) {
1728
1729         if (psv == 0) {
1730                 printk(KERN_NOTICE "ACPI: %s detected: "
1731                         "disabling all passive thermal trip points\n", d->ident);
1732                 psv = -1;
1733         }
1734         return 0;
1735 }
1736
1737 static struct dmi_system_id thermal_dmi_table[] __initdata = {
1738         /*
1739          * Award BIOS on this AOpen makes thermal control almost worthless.
1740          * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1741          */
1742         {
1743          .callback = thermal_act,
1744          .ident = "AOpen i915GMm-HFS",
1745          .matches = {
1746                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1747                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1748                 },
1749         },
1750         {
1751          .callback = thermal_psv,
1752          .ident = "AOpen i915GMm-HFS",
1753          .matches = {
1754                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1755                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1756                 },
1757         },
1758         {
1759          .callback = thermal_tzp,
1760          .ident = "AOpen i915GMm-HFS",
1761          .matches = {
1762                 DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1763                 DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1764                 },
1765         },
1766         {
1767          .callback = thermal_nocrt,
1768          .ident = "Gigabyte GA-7ZX",
1769          .matches = {
1770                 DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1771                 DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1772                 },
1773         },
1774         {}
1775 };
1776
1777 static int __init acpi_thermal_init(void)
1778 {
1779         int result = 0;
1780
1781         dmi_check_system(thermal_dmi_table);
1782
1783         if (off) {
1784                 printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1785                 return -ENODEV;
1786         }
1787         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
1788         if (!acpi_thermal_dir)
1789                 return -ENODEV;
1790         acpi_thermal_dir->owner = THIS_MODULE;
1791
1792         result = acpi_bus_register_driver(&acpi_thermal_driver);
1793         if (result < 0) {
1794                 remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1795                 return -ENODEV;
1796         }
1797
1798         return 0;
1799 }
1800
1801 static void __exit acpi_thermal_exit(void)
1802 {
1803
1804         acpi_bus_unregister_driver(&acpi_thermal_driver);
1805
1806         remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1807
1808         return;
1809 }
1810
1811 module_init(acpi_thermal_init);
1812 module_exit(acpi_thermal_exit);