thermal: struct device - replace bus_id with dev_name(), dev_set_name()
[linux-2.6.git] / drivers / thermal / thermal_sys.c
1 /*
2  *  thermal.c - Generic Thermal Management Sysfs support.
3  *
4  *  Copyright (C) 2008 Intel Corp
5  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
6  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
7  *
8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License as published by
12  *  the Free Software Foundation; version 2 of the License.
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
26 #include <linux/module.h>
27 #include <linux/device.h>
28 #include <linux/err.h>
29 #include <linux/kdev_t.h>
30 #include <linux/idr.h>
31 #include <linux/thermal.h>
32 #include <linux/spinlock.h>
33
34 MODULE_AUTHOR("Zhang Rui");
35 MODULE_DESCRIPTION("Generic thermal management sysfs support");
36 MODULE_LICENSE("GPL");
37
38 #define PREFIX "Thermal: "
39
40 struct thermal_cooling_device_instance {
41         int id;
42         char name[THERMAL_NAME_LENGTH];
43         struct thermal_zone_device *tz;
44         struct thermal_cooling_device *cdev;
45         int trip;
46         char attr_name[THERMAL_NAME_LENGTH];
47         struct device_attribute attr;
48         struct list_head node;
49 };
50
51 static DEFINE_IDR(thermal_tz_idr);
52 static DEFINE_IDR(thermal_cdev_idr);
53 static DEFINE_MUTEX(thermal_idr_lock);
54
55 static LIST_HEAD(thermal_tz_list);
56 static LIST_HEAD(thermal_cdev_list);
57 static DEFINE_MUTEX(thermal_list_lock);
58
59 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
60 {
61         int err;
62
63       again:
64         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
65                 return -ENOMEM;
66
67         if (lock)
68                 mutex_lock(lock);
69         err = idr_get_new(idr, NULL, id);
70         if (lock)
71                 mutex_unlock(lock);
72         if (unlikely(err == -EAGAIN))
73                 goto again;
74         else if (unlikely(err))
75                 return err;
76
77         *id = *id & MAX_ID_MASK;
78         return 0;
79 }
80
81 static void release_idr(struct idr *idr, struct mutex *lock, int id)
82 {
83         if (lock)
84                 mutex_lock(lock);
85         idr_remove(idr, id);
86         if (lock)
87                 mutex_unlock(lock);
88 }
89
90 /* sys I/F for thermal zone */
91
92 #define to_thermal_zone(_dev) \
93         container_of(_dev, struct thermal_zone_device, device)
94
95 static ssize_t
96 type_show(struct device *dev, struct device_attribute *attr, char *buf)
97 {
98         struct thermal_zone_device *tz = to_thermal_zone(dev);
99
100         return sprintf(buf, "%s\n", tz->type);
101 }
102
103 static ssize_t
104 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
105 {
106         struct thermal_zone_device *tz = to_thermal_zone(dev);
107
108         if (!tz->ops->get_temp)
109                 return -EPERM;
110
111         return tz->ops->get_temp(tz, buf);
112 }
113
114 static ssize_t
115 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
116 {
117         struct thermal_zone_device *tz = to_thermal_zone(dev);
118
119         if (!tz->ops->get_mode)
120                 return -EPERM;
121
122         return tz->ops->get_mode(tz, buf);
123 }
124
125 static ssize_t
126 mode_store(struct device *dev, struct device_attribute *attr,
127            const char *buf, size_t count)
128 {
129         struct thermal_zone_device *tz = to_thermal_zone(dev);
130         int result;
131
132         if (!tz->ops->set_mode)
133                 return -EPERM;
134
135         result = tz->ops->set_mode(tz, buf);
136         if (result)
137                 return result;
138
139         return count;
140 }
141
142 static ssize_t
143 trip_point_type_show(struct device *dev, struct device_attribute *attr,
144                      char *buf)
145 {
146         struct thermal_zone_device *tz = to_thermal_zone(dev);
147         int trip;
148
149         if (!tz->ops->get_trip_type)
150                 return -EPERM;
151
152         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
153                 return -EINVAL;
154
155         return tz->ops->get_trip_type(tz, trip, buf);
156 }
157
158 static ssize_t
159 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
160                      char *buf)
161 {
162         struct thermal_zone_device *tz = to_thermal_zone(dev);
163         int trip;
164
165         if (!tz->ops->get_trip_temp)
166                 return -EPERM;
167
168         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
169                 return -EINVAL;
170
171         return tz->ops->get_trip_temp(tz, trip, buf);
172 }
173
174 static DEVICE_ATTR(type, 0444, type_show, NULL);
175 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
176 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
177
178 static struct device_attribute trip_point_attrs[] = {
179         __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
180         __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
181         __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
182         __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
183         __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
184         __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
185         __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
186         __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
187         __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
188         __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
189         __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
190         __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
191         __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
192         __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
193         __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
194         __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
195         __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
196         __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
197         __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
198         __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
199         __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
200         __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
201         __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
202         __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
203 };
204
205 #define TRIP_POINT_ATTR_ADD(_dev, _index, result)     \
206 do {    \
207         result = device_create_file(_dev,       \
208                                 &trip_point_attrs[_index * 2]); \
209         if (result)     \
210                 break;  \
211         result = device_create_file(_dev,       \
212                         &trip_point_attrs[_index * 2 + 1]);     \
213 } while (0)
214
215 #define TRIP_POINT_ATTR_REMOVE(_dev, _index)    \
216 do {    \
217         device_remove_file(_dev, &trip_point_attrs[_index * 2]);        \
218         device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);    \
219 } while (0)
220
221 /* sys I/F for cooling device */
222 #define to_cooling_device(_dev) \
223         container_of(_dev, struct thermal_cooling_device, device)
224
225 static ssize_t
226 thermal_cooling_device_type_show(struct device *dev,
227                                  struct device_attribute *attr, char *buf)
228 {
229         struct thermal_cooling_device *cdev = to_cooling_device(dev);
230
231         return sprintf(buf, "%s\n", cdev->type);
232 }
233
234 static ssize_t
235 thermal_cooling_device_max_state_show(struct device *dev,
236                                       struct device_attribute *attr, char *buf)
237 {
238         struct thermal_cooling_device *cdev = to_cooling_device(dev);
239
240         return cdev->ops->get_max_state(cdev, buf);
241 }
242
243 static ssize_t
244 thermal_cooling_device_cur_state_show(struct device *dev,
245                                       struct device_attribute *attr, char *buf)
246 {
247         struct thermal_cooling_device *cdev = to_cooling_device(dev);
248
249         return cdev->ops->get_cur_state(cdev, buf);
250 }
251
252 static ssize_t
253 thermal_cooling_device_cur_state_store(struct device *dev,
254                                        struct device_attribute *attr,
255                                        const char *buf, size_t count)
256 {
257         struct thermal_cooling_device *cdev = to_cooling_device(dev);
258         int state;
259         int result;
260
261         if (!sscanf(buf, "%d\n", &state))
262                 return -EINVAL;
263
264         if (state < 0)
265                 return -EINVAL;
266
267         result = cdev->ops->set_cur_state(cdev, state);
268         if (result)
269                 return result;
270         return count;
271 }
272
273 static struct device_attribute dev_attr_cdev_type =
274 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
275 static DEVICE_ATTR(max_state, 0444,
276                    thermal_cooling_device_max_state_show, NULL);
277 static DEVICE_ATTR(cur_state, 0644,
278                    thermal_cooling_device_cur_state_show,
279                    thermal_cooling_device_cur_state_store);
280
281 static ssize_t
282 thermal_cooling_device_trip_point_show(struct device *dev,
283                                        struct device_attribute *attr, char *buf)
284 {
285         struct thermal_cooling_device_instance *instance;
286
287         instance =
288             container_of(attr, struct thermal_cooling_device_instance, attr);
289
290         if (instance->trip == THERMAL_TRIPS_NONE)
291                 return sprintf(buf, "-1\n");
292         else
293                 return sprintf(buf, "%d\n", instance->trip);
294 }
295
296 /* Device management */
297
298 #if defined(CONFIG_THERMAL_HWMON)
299
300 /* hwmon sys I/F */
301 #include <linux/hwmon.h>
302 static LIST_HEAD(thermal_hwmon_list);
303
304 static ssize_t
305 name_show(struct device *dev, struct device_attribute *attr, char *buf)
306 {
307         struct thermal_hwmon_device *hwmon = dev->driver_data;
308         return sprintf(buf, "%s\n", hwmon->type);
309 }
310 static DEVICE_ATTR(name, 0444, name_show, NULL);
311
312 static ssize_t
313 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
314 {
315         struct thermal_hwmon_attr *hwmon_attr
316                         = container_of(attr, struct thermal_hwmon_attr, attr);
317         struct thermal_zone_device *tz
318                         = container_of(hwmon_attr, struct thermal_zone_device,
319                                        temp_input);
320
321         return tz->ops->get_temp(tz, buf);
322 }
323
324 static ssize_t
325 temp_crit_show(struct device *dev, struct device_attribute *attr,
326                 char *buf)
327 {
328         struct thermal_hwmon_attr *hwmon_attr
329                         = container_of(attr, struct thermal_hwmon_attr, attr);
330         struct thermal_zone_device *tz
331                         = container_of(hwmon_attr, struct thermal_zone_device,
332                                        temp_crit);
333
334         return tz->ops->get_trip_temp(tz, 0, buf);
335 }
336
337
338 static int
339 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
340 {
341         struct thermal_hwmon_device *hwmon;
342         int new_hwmon_device = 1;
343         int result;
344
345         mutex_lock(&thermal_list_lock);
346         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
347                 if (!strcmp(hwmon->type, tz->type)) {
348                         new_hwmon_device = 0;
349                         mutex_unlock(&thermal_list_lock);
350                         goto register_sys_interface;
351                 }
352         mutex_unlock(&thermal_list_lock);
353
354         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
355         if (!hwmon)
356                 return -ENOMEM;
357
358         INIT_LIST_HEAD(&hwmon->tz_list);
359         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
360         hwmon->device = hwmon_device_register(NULL);
361         if (IS_ERR(hwmon->device)) {
362                 result = PTR_ERR(hwmon->device);
363                 goto free_mem;
364         }
365         hwmon->device->driver_data = hwmon;
366         result = device_create_file(hwmon->device, &dev_attr_name);
367         if (result)
368                 goto unregister_hwmon_device;
369
370  register_sys_interface:
371         tz->hwmon = hwmon;
372         hwmon->count++;
373
374         snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
375                  "temp%d_input", hwmon->count);
376         tz->temp_input.attr.attr.name = tz->temp_input.name;
377         tz->temp_input.attr.attr.mode = 0444;
378         tz->temp_input.attr.show = temp_input_show;
379         result = device_create_file(hwmon->device, &tz->temp_input.attr);
380         if (result)
381                 goto unregister_hwmon_device;
382
383         if (tz->ops->get_crit_temp) {
384                 unsigned long temperature;
385                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
386                         snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
387                                 "temp%d_crit", hwmon->count);
388                         tz->temp_crit.attr.attr.name = tz->temp_crit.name;
389                         tz->temp_crit.attr.attr.mode = 0444;
390                         tz->temp_crit.attr.show = temp_crit_show;
391                         result = device_create_file(hwmon->device,
392                                                     &tz->temp_crit.attr);
393                         if (result)
394                                 goto unregister_hwmon_device;
395                 }
396         }
397
398         mutex_lock(&thermal_list_lock);
399         if (new_hwmon_device)
400                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
401         list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
402         mutex_unlock(&thermal_list_lock);
403
404         return 0;
405
406  unregister_hwmon_device:
407         device_remove_file(hwmon->device, &tz->temp_crit.attr);
408         device_remove_file(hwmon->device, &tz->temp_input.attr);
409         if (new_hwmon_device) {
410                 device_remove_file(hwmon->device, &dev_attr_name);
411                 hwmon_device_unregister(hwmon->device);
412         }
413  free_mem:
414         if (new_hwmon_device)
415                 kfree(hwmon);
416
417         return result;
418 }
419
420 static void
421 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
422 {
423         struct thermal_hwmon_device *hwmon = tz->hwmon;
424
425         tz->hwmon = NULL;
426         device_remove_file(hwmon->device, &tz->temp_input.attr);
427         device_remove_file(hwmon->device, &tz->temp_crit.attr);
428
429         mutex_lock(&thermal_list_lock);
430         list_del(&tz->hwmon_node);
431         if (!list_empty(&hwmon->tz_list)) {
432                 mutex_unlock(&thermal_list_lock);
433                 return;
434         }
435         list_del(&hwmon->node);
436         mutex_unlock(&thermal_list_lock);
437
438         device_remove_file(hwmon->device, &dev_attr_name);
439         hwmon_device_unregister(hwmon->device);
440         kfree(hwmon);
441 }
442 #else
443 static int
444 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
445 {
446         return 0;
447 }
448
449 static void
450 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
451 {
452 }
453 #endif
454
455
456 /**
457  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
458  * @tz:         thermal zone device
459  * @trip:       indicates which trip point the cooling devices is
460  *              associated with in this thermal zone.
461  * @cdev:       thermal cooling device
462  *
463  * This function is usually called in the thermal zone device .bind callback.
464  */
465 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
466                                      int trip,
467                                      struct thermal_cooling_device *cdev)
468 {
469         struct thermal_cooling_device_instance *dev;
470         struct thermal_cooling_device_instance *pos;
471         struct thermal_zone_device *pos1;
472         struct thermal_cooling_device *pos2;
473         int result;
474
475         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
476                 return -EINVAL;
477
478         list_for_each_entry(pos1, &thermal_tz_list, node) {
479                 if (pos1 == tz)
480                         break;
481         }
482         list_for_each_entry(pos2, &thermal_cdev_list, node) {
483                 if (pos2 == cdev)
484                         break;
485         }
486
487         if (tz != pos1 || cdev != pos2)
488                 return -EINVAL;
489
490         dev =
491             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
492         if (!dev)
493                 return -ENOMEM;
494         dev->tz = tz;
495         dev->cdev = cdev;
496         dev->trip = trip;
497         result = get_idr(&tz->idr, &tz->lock, &dev->id);
498         if (result)
499                 goto free_mem;
500
501         sprintf(dev->name, "cdev%d", dev->id);
502         result =
503             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
504         if (result)
505                 goto release_idr;
506
507         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
508         dev->attr.attr.name = dev->attr_name;
509         dev->attr.attr.mode = 0444;
510         dev->attr.show = thermal_cooling_device_trip_point_show;
511         result = device_create_file(&tz->device, &dev->attr);
512         if (result)
513                 goto remove_symbol_link;
514
515         mutex_lock(&tz->lock);
516         list_for_each_entry(pos, &tz->cooling_devices, node)
517             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
518                 result = -EEXIST;
519                 break;
520         }
521         if (!result)
522                 list_add_tail(&dev->node, &tz->cooling_devices);
523         mutex_unlock(&tz->lock);
524
525         if (!result)
526                 return 0;
527
528         device_remove_file(&tz->device, &dev->attr);
529       remove_symbol_link:
530         sysfs_remove_link(&tz->device.kobj, dev->name);
531       release_idr:
532         release_idr(&tz->idr, &tz->lock, dev->id);
533       free_mem:
534         kfree(dev);
535         return result;
536 }
537
538 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
539
540 /**
541  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
542  * @tz:         thermal zone device
543  * @trip:       indicates which trip point the cooling devices is
544  *              associated with in this thermal zone.
545  * @cdev:       thermal cooling device
546  *
547  * This function is usually called in the thermal zone device .unbind callback.
548  */
549 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
550                                        int trip,
551                                        struct thermal_cooling_device *cdev)
552 {
553         struct thermal_cooling_device_instance *pos, *next;
554
555         mutex_lock(&tz->lock);
556         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
557                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
558                         list_del(&pos->node);
559                         mutex_unlock(&tz->lock);
560                         goto unbind;
561                 }
562         }
563         mutex_unlock(&tz->lock);
564
565         return -ENODEV;
566
567       unbind:
568         device_remove_file(&tz->device, &pos->attr);
569         sysfs_remove_link(&tz->device.kobj, pos->name);
570         release_idr(&tz->idr, &tz->lock, pos->id);
571         kfree(pos);
572         return 0;
573 }
574
575 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
576
577 static void thermal_release(struct device *dev)
578 {
579         struct thermal_zone_device *tz;
580         struct thermal_cooling_device *cdev;
581
582         if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
583                 tz = to_thermal_zone(dev);
584                 kfree(tz);
585         } else {
586                 cdev = to_cooling_device(dev);
587                 kfree(cdev);
588         }
589 }
590
591 static struct class thermal_class = {
592         .name = "thermal",
593         .dev_release = thermal_release,
594 };
595
596 /**
597  * thermal_cooling_device_register - register a new thermal cooling device
598  * @type:       the thermal cooling device type.
599  * @devdata:    device private data.
600  * @ops:                standard thermal cooling devices callbacks.
601  */
602 struct thermal_cooling_device *thermal_cooling_device_register(char *type,
603                                                                void *devdata,
604                                                                struct
605                                                                thermal_cooling_device_ops
606                                                                *ops)
607 {
608         struct thermal_cooling_device *cdev;
609         struct thermal_zone_device *pos;
610         int result;
611
612         if (strlen(type) >= THERMAL_NAME_LENGTH)
613                 return ERR_PTR(-EINVAL);
614
615         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
616             !ops->set_cur_state)
617                 return ERR_PTR(-EINVAL);
618
619         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
620         if (!cdev)
621                 return ERR_PTR(-ENOMEM);
622
623         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
624         if (result) {
625                 kfree(cdev);
626                 return ERR_PTR(result);
627         }
628
629         strcpy(cdev->type, type);
630         cdev->ops = ops;
631         cdev->device.class = &thermal_class;
632         cdev->devdata = devdata;
633         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
634         result = device_register(&cdev->device);
635         if (result) {
636                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
637                 kfree(cdev);
638                 return ERR_PTR(result);
639         }
640
641         /* sys I/F */
642         if (type) {
643                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
644                 if (result)
645                         goto unregister;
646         }
647
648         result = device_create_file(&cdev->device, &dev_attr_max_state);
649         if (result)
650                 goto unregister;
651
652         result = device_create_file(&cdev->device, &dev_attr_cur_state);
653         if (result)
654                 goto unregister;
655
656         mutex_lock(&thermal_list_lock);
657         list_add(&cdev->node, &thermal_cdev_list);
658         list_for_each_entry(pos, &thermal_tz_list, node) {
659                 if (!pos->ops->bind)
660                         continue;
661                 result = pos->ops->bind(pos, cdev);
662                 if (result)
663                         break;
664
665         }
666         mutex_unlock(&thermal_list_lock);
667
668         if (!result)
669                 return cdev;
670
671       unregister:
672         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
673         device_unregister(&cdev->device);
674         return ERR_PTR(result);
675 }
676
677 EXPORT_SYMBOL(thermal_cooling_device_register);
678
679 /**
680  * thermal_cooling_device_unregister - removes the registered thermal cooling device
681  * @cdev:       the thermal cooling device to remove.
682  *
683  * thermal_cooling_device_unregister() must be called when the device is no
684  * longer needed.
685  */
686 void thermal_cooling_device_unregister(struct
687                                        thermal_cooling_device
688                                        *cdev)
689 {
690         struct thermal_zone_device *tz;
691         struct thermal_cooling_device *pos = NULL;
692
693         if (!cdev)
694                 return;
695
696         mutex_lock(&thermal_list_lock);
697         list_for_each_entry(pos, &thermal_cdev_list, node)
698             if (pos == cdev)
699                 break;
700         if (pos != cdev) {
701                 /* thermal cooling device not found */
702                 mutex_unlock(&thermal_list_lock);
703                 return;
704         }
705         list_del(&cdev->node);
706         list_for_each_entry(tz, &thermal_tz_list, node) {
707                 if (!tz->ops->unbind)
708                         continue;
709                 tz->ops->unbind(tz, cdev);
710         }
711         mutex_unlock(&thermal_list_lock);
712         if (cdev->type[0])
713                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
714         device_remove_file(&cdev->device, &dev_attr_max_state);
715         device_remove_file(&cdev->device, &dev_attr_cur_state);
716
717         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
718         device_unregister(&cdev->device);
719         return;
720 }
721
722 EXPORT_SYMBOL(thermal_cooling_device_unregister);
723
724 /**
725  * thermal_zone_device_register - register a new thermal zone device
726  * @type:       the thermal zone device type
727  * @trips:      the number of trip points the thermal zone support
728  * @devdata:    private device data
729  * @ops:        standard thermal zone device callbacks
730  *
731  * thermal_zone_device_unregister() must be called when the device is no
732  * longer needed.
733  */
734 struct thermal_zone_device *thermal_zone_device_register(char *type,
735                                                          int trips,
736                                                          void *devdata, struct
737                                                          thermal_zone_device_ops
738                                                          *ops)
739 {
740         struct thermal_zone_device *tz;
741         struct thermal_cooling_device *pos;
742         int result;
743         int count;
744
745         if (strlen(type) >= THERMAL_NAME_LENGTH)
746                 return ERR_PTR(-EINVAL);
747
748         if (trips > THERMAL_MAX_TRIPS || trips < 0)
749                 return ERR_PTR(-EINVAL);
750
751         if (!ops || !ops->get_temp)
752                 return ERR_PTR(-EINVAL);
753
754         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
755         if (!tz)
756                 return ERR_PTR(-ENOMEM);
757
758         INIT_LIST_HEAD(&tz->cooling_devices);
759         idr_init(&tz->idr);
760         mutex_init(&tz->lock);
761         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
762         if (result) {
763                 kfree(tz);
764                 return ERR_PTR(result);
765         }
766
767         strcpy(tz->type, type);
768         tz->ops = ops;
769         tz->device.class = &thermal_class;
770         tz->devdata = devdata;
771         tz->trips = trips;
772         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
773         result = device_register(&tz->device);
774         if (result) {
775                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
776                 kfree(tz);
777                 return ERR_PTR(result);
778         }
779
780         /* sys I/F */
781         if (type) {
782                 result = device_create_file(&tz->device, &dev_attr_type);
783                 if (result)
784                         goto unregister;
785         }
786
787         result = device_create_file(&tz->device, &dev_attr_temp);
788         if (result)
789                 goto unregister;
790
791         if (ops->get_mode) {
792                 result = device_create_file(&tz->device, &dev_attr_mode);
793                 if (result)
794                         goto unregister;
795         }
796
797         for (count = 0; count < trips; count++) {
798                 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
799                 if (result)
800                         goto unregister;
801         }
802
803         result = thermal_add_hwmon_sysfs(tz);
804         if (result)
805                 goto unregister;
806
807         mutex_lock(&thermal_list_lock);
808         list_add_tail(&tz->node, &thermal_tz_list);
809         if (ops->bind)
810                 list_for_each_entry(pos, &thermal_cdev_list, node) {
811                 result = ops->bind(tz, pos);
812                 if (result)
813                         break;
814                 }
815         mutex_unlock(&thermal_list_lock);
816
817         if (!result)
818                 return tz;
819
820       unregister:
821         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
822         device_unregister(&tz->device);
823         return ERR_PTR(result);
824 }
825
826 EXPORT_SYMBOL(thermal_zone_device_register);
827
828 /**
829  * thermal_device_unregister - removes the registered thermal zone device
830  * @tz: the thermal zone device to remove
831  */
832 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
833 {
834         struct thermal_cooling_device *cdev;
835         struct thermal_zone_device *pos = NULL;
836         int count;
837
838         if (!tz)
839                 return;
840
841         mutex_lock(&thermal_list_lock);
842         list_for_each_entry(pos, &thermal_tz_list, node)
843             if (pos == tz)
844                 break;
845         if (pos != tz) {
846                 /* thermal zone device not found */
847                 mutex_unlock(&thermal_list_lock);
848                 return;
849         }
850         list_del(&tz->node);
851         if (tz->ops->unbind)
852                 list_for_each_entry(cdev, &thermal_cdev_list, node)
853                     tz->ops->unbind(tz, cdev);
854         mutex_unlock(&thermal_list_lock);
855
856         if (tz->type[0])
857                 device_remove_file(&tz->device, &dev_attr_type);
858         device_remove_file(&tz->device, &dev_attr_temp);
859         if (tz->ops->get_mode)
860                 device_remove_file(&tz->device, &dev_attr_mode);
861
862         for (count = 0; count < tz->trips; count++)
863                 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
864
865         thermal_remove_hwmon_sysfs(tz);
866         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
867         idr_destroy(&tz->idr);
868         mutex_destroy(&tz->lock);
869         device_unregister(&tz->device);
870         return;
871 }
872
873 EXPORT_SYMBOL(thermal_zone_device_unregister);
874
875 static int __init thermal_init(void)
876 {
877         int result = 0;
878
879         result = class_register(&thermal_class);
880         if (result) {
881                 idr_destroy(&thermal_tz_idr);
882                 idr_destroy(&thermal_cdev_idr);
883                 mutex_destroy(&thermal_idr_lock);
884                 mutex_destroy(&thermal_list_lock);
885         }
886         return result;
887 }
888
889 static void __exit thermal_exit(void)
890 {
891         class_unregister(&thermal_class);
892         idr_destroy(&thermal_tz_idr);
893         idr_destroy(&thermal_cdev_idr);
894         mutex_destroy(&thermal_idr_lock);
895         mutex_destroy(&thermal_list_lock);
896 }
897
898 subsys_initcall(thermal_init);
899 module_exit(thermal_exit);