Root/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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
28#include <linux/module.h>
29#include <linux/device.h>
30#include <linux/err.h>
31#include <linux/slab.h>
32#include <linux/kdev_t.h>
33#include <linux/idr.h>
34#include <linux/thermal.h>
35#include <linux/reboot.h>
36#include <net/netlink.h>
37#include <net/genetlink.h>
38
39#include "thermal_core.h"
40
41MODULE_AUTHOR("Zhang Rui");
42MODULE_DESCRIPTION("Generic thermal management sysfs support");
43MODULE_LICENSE("GPL");
44
45static DEFINE_IDR(thermal_tz_idr);
46static DEFINE_IDR(thermal_cdev_idr);
47static DEFINE_MUTEX(thermal_idr_lock);
48
49static LIST_HEAD(thermal_tz_list);
50static LIST_HEAD(thermal_cdev_list);
51static LIST_HEAD(thermal_governor_list);
52
53static DEFINE_MUTEX(thermal_list_lock);
54static DEFINE_MUTEX(thermal_governor_lock);
55
56static struct thermal_governor *__find_governor(const char *name)
57{
58    struct thermal_governor *pos;
59
60    list_for_each_entry(pos, &thermal_governor_list, governor_list)
61        if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
62            return pos;
63
64    return NULL;
65}
66
67int thermal_register_governor(struct thermal_governor *governor)
68{
69    int err;
70    const char *name;
71    struct thermal_zone_device *pos;
72
73    if (!governor)
74        return -EINVAL;
75
76    mutex_lock(&thermal_governor_lock);
77
78    err = -EBUSY;
79    if (__find_governor(governor->name) == NULL) {
80        err = 0;
81        list_add(&governor->governor_list, &thermal_governor_list);
82    }
83
84    mutex_lock(&thermal_list_lock);
85
86    list_for_each_entry(pos, &thermal_tz_list, node) {
87        if (pos->governor)
88            continue;
89        if (pos->tzp)
90            name = pos->tzp->governor_name;
91        else
92            name = DEFAULT_THERMAL_GOVERNOR;
93        if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
94            pos->governor = governor;
95    }
96
97    mutex_unlock(&thermal_list_lock);
98    mutex_unlock(&thermal_governor_lock);
99
100    return err;
101}
102EXPORT_SYMBOL_GPL(thermal_register_governor);
103
104void thermal_unregister_governor(struct thermal_governor *governor)
105{
106    struct thermal_zone_device *pos;
107
108    if (!governor)
109        return;
110
111    mutex_lock(&thermal_governor_lock);
112
113    if (__find_governor(governor->name) == NULL)
114        goto exit;
115
116    mutex_lock(&thermal_list_lock);
117
118    list_for_each_entry(pos, &thermal_tz_list, node) {
119        if (!strnicmp(pos->governor->name, governor->name,
120                        THERMAL_NAME_LENGTH))
121            pos->governor = NULL;
122    }
123
124    mutex_unlock(&thermal_list_lock);
125    list_del(&governor->governor_list);
126exit:
127    mutex_unlock(&thermal_governor_lock);
128    return;
129}
130EXPORT_SYMBOL_GPL(thermal_unregister_governor);
131
132static int get_idr(struct idr *idr, struct mutex *lock, int *id)
133{
134    int ret;
135
136    if (lock)
137        mutex_lock(lock);
138    ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
139    if (lock)
140        mutex_unlock(lock);
141    if (unlikely(ret < 0))
142        return ret;
143    *id = ret;
144    return 0;
145}
146
147static void release_idr(struct idr *idr, struct mutex *lock, int id)
148{
149    if (lock)
150        mutex_lock(lock);
151    idr_remove(idr, id);
152    if (lock)
153        mutex_unlock(lock);
154}
155
156int get_tz_trend(struct thermal_zone_device *tz, int trip)
157{
158    enum thermal_trend trend;
159
160    if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
161        if (tz->temperature > tz->last_temperature)
162            trend = THERMAL_TREND_RAISING;
163        else if (tz->temperature < tz->last_temperature)
164            trend = THERMAL_TREND_DROPPING;
165        else
166            trend = THERMAL_TREND_STABLE;
167    }
168
169    return trend;
170}
171EXPORT_SYMBOL(get_tz_trend);
172
173struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
174            struct thermal_cooling_device *cdev, int trip)
175{
176    struct thermal_instance *pos = NULL;
177    struct thermal_instance *target_instance = NULL;
178
179    mutex_lock(&tz->lock);
180    mutex_lock(&cdev->lock);
181
182    list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
183        if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
184            target_instance = pos;
185            break;
186        }
187    }
188
189    mutex_unlock(&cdev->lock);
190    mutex_unlock(&tz->lock);
191
192    return target_instance;
193}
194EXPORT_SYMBOL(get_thermal_instance);
195
196static void print_bind_err_msg(struct thermal_zone_device *tz,
197            struct thermal_cooling_device *cdev, int ret)
198{
199    dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
200                tz->type, cdev->type, ret);
201}
202
203static void __bind(struct thermal_zone_device *tz, int mask,
204            struct thermal_cooling_device *cdev)
205{
206    int i, ret;
207
208    for (i = 0; i < tz->trips; i++) {
209        if (mask & (1 << i)) {
210            ret = thermal_zone_bind_cooling_device(tz, i, cdev,
211                    THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
212            if (ret)
213                print_bind_err_msg(tz, cdev, ret);
214        }
215    }
216}
217
218static void __unbind(struct thermal_zone_device *tz, int mask,
219            struct thermal_cooling_device *cdev)
220{
221    int i;
222
223    for (i = 0; i < tz->trips; i++)
224        if (mask & (1 << i))
225            thermal_zone_unbind_cooling_device(tz, i, cdev);
226}
227
228static void bind_cdev(struct thermal_cooling_device *cdev)
229{
230    int i, ret;
231    const struct thermal_zone_params *tzp;
232    struct thermal_zone_device *pos = NULL;
233
234    mutex_lock(&thermal_list_lock);
235
236    list_for_each_entry(pos, &thermal_tz_list, node) {
237        if (!pos->tzp && !pos->ops->bind)
238            continue;
239
240        if (!pos->tzp && pos->ops->bind) {
241            ret = pos->ops->bind(pos, cdev);
242            if (ret)
243                print_bind_err_msg(pos, cdev, ret);
244        }
245
246        tzp = pos->tzp;
247        if (!tzp || !tzp->tbp)
248            continue;
249
250        for (i = 0; i < tzp->num_tbps; i++) {
251            if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
252                continue;
253            if (tzp->tbp[i].match(pos, cdev))
254                continue;
255            tzp->tbp[i].cdev = cdev;
256            __bind(pos, tzp->tbp[i].trip_mask, cdev);
257        }
258    }
259
260    mutex_unlock(&thermal_list_lock);
261}
262
263static void bind_tz(struct thermal_zone_device *tz)
264{
265    int i, ret;
266    struct thermal_cooling_device *pos = NULL;
267    const struct thermal_zone_params *tzp = tz->tzp;
268
269    if (!tzp && !tz->ops->bind)
270        return;
271
272    mutex_lock(&thermal_list_lock);
273
274    /* If there is no platform data, try to use ops->bind */
275    if (!tzp && tz->ops->bind) {
276        list_for_each_entry(pos, &thermal_cdev_list, node) {
277            ret = tz->ops->bind(tz, pos);
278            if (ret)
279                print_bind_err_msg(tz, pos, ret);
280        }
281        goto exit;
282    }
283
284    if (!tzp || !tzp->tbp)
285        goto exit;
286
287    list_for_each_entry(pos, &thermal_cdev_list, node) {
288        for (i = 0; i < tzp->num_tbps; i++) {
289            if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
290                continue;
291            if (tzp->tbp[i].match(tz, pos))
292                continue;
293            tzp->tbp[i].cdev = pos;
294            __bind(tz, tzp->tbp[i].trip_mask, pos);
295        }
296    }
297exit:
298    mutex_unlock(&thermal_list_lock);
299}
300
301static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
302                        int delay)
303{
304    if (delay > 1000)
305        mod_delayed_work(system_freezable_wq, &tz->poll_queue,
306                 round_jiffies(msecs_to_jiffies(delay)));
307    else if (delay)
308        mod_delayed_work(system_freezable_wq, &tz->poll_queue,
309                 msecs_to_jiffies(delay));
310    else
311        cancel_delayed_work(&tz->poll_queue);
312}
313
314static void monitor_thermal_zone(struct thermal_zone_device *tz)
315{
316    mutex_lock(&tz->lock);
317
318    if (tz->passive)
319        thermal_zone_device_set_polling(tz, tz->passive_delay);
320    else if (tz->polling_delay)
321        thermal_zone_device_set_polling(tz, tz->polling_delay);
322    else
323        thermal_zone_device_set_polling(tz, 0);
324
325    mutex_unlock(&tz->lock);
326}
327
328static void handle_non_critical_trips(struct thermal_zone_device *tz,
329            int trip, enum thermal_trip_type trip_type)
330{
331    if (tz->governor)
332        tz->governor->throttle(tz, trip);
333}
334
335static void handle_critical_trips(struct thermal_zone_device *tz,
336                int trip, enum thermal_trip_type trip_type)
337{
338    long trip_temp;
339
340    tz->ops->get_trip_temp(tz, trip, &trip_temp);
341
342    /* If we have not crossed the trip_temp, we do not care. */
343    if (tz->temperature < trip_temp)
344        return;
345
346    if (tz->ops->notify)
347        tz->ops->notify(tz, trip, trip_type);
348
349    if (trip_type == THERMAL_TRIP_CRITICAL) {
350        dev_emerg(&tz->device,
351              "critical temperature reached(%d C),shutting down\n",
352              tz->temperature / 1000);
353        orderly_poweroff(true);
354    }
355}
356
357static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
358{
359    enum thermal_trip_type type;
360
361    tz->ops->get_trip_type(tz, trip, &type);
362
363    if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
364        handle_critical_trips(tz, trip, type);
365    else
366        handle_non_critical_trips(tz, trip, type);
367    /*
368     * Alright, we handled this trip successfully.
369     * So, start monitoring again.
370     */
371    monitor_thermal_zone(tz);
372}
373
374static int thermal_zone_get_temp(struct thermal_zone_device *tz,
375                unsigned long *temp)
376{
377    int ret = 0;
378#ifdef CONFIG_THERMAL_EMULATION
379    int count;
380    unsigned long crit_temp = -1UL;
381    enum thermal_trip_type type;
382#endif
383
384    mutex_lock(&tz->lock);
385
386    ret = tz->ops->get_temp(tz, temp);
387#ifdef CONFIG_THERMAL_EMULATION
388    if (!tz->emul_temperature)
389        goto skip_emul;
390
391    for (count = 0; count < tz->trips; count++) {
392        ret = tz->ops->get_trip_type(tz, count, &type);
393        if (!ret && type == THERMAL_TRIP_CRITICAL) {
394            ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
395            break;
396        }
397    }
398
399    if (ret)
400        goto skip_emul;
401
402    if (*temp < crit_temp)
403        *temp = tz->emul_temperature;
404skip_emul:
405#endif
406    mutex_unlock(&tz->lock);
407    return ret;
408}
409
410static void update_temperature(struct thermal_zone_device *tz)
411{
412    long temp;
413    int ret;
414
415    ret = thermal_zone_get_temp(tz, &temp);
416    if (ret) {
417        dev_warn(&tz->device, "failed to read out thermal zone %d\n",
418             tz->id);
419        return;
420    }
421
422    mutex_lock(&tz->lock);
423    tz->last_temperature = tz->temperature;
424    tz->temperature = temp;
425    mutex_unlock(&tz->lock);
426}
427
428void thermal_zone_device_update(struct thermal_zone_device *tz)
429{
430    int count;
431
432    update_temperature(tz);
433
434    for (count = 0; count < tz->trips; count++)
435        handle_thermal_trip(tz, count);
436}
437EXPORT_SYMBOL(thermal_zone_device_update);
438
439static void thermal_zone_device_check(struct work_struct *work)
440{
441    struct thermal_zone_device *tz = container_of(work, struct
442                              thermal_zone_device,
443                              poll_queue.work);
444    thermal_zone_device_update(tz);
445}
446
447/* sys I/F for thermal zone */
448
449#define to_thermal_zone(_dev) \
450    container_of(_dev, struct thermal_zone_device, device)
451
452static ssize_t
453type_show(struct device *dev, struct device_attribute *attr, char *buf)
454{
455    struct thermal_zone_device *tz = to_thermal_zone(dev);
456
457    return sprintf(buf, "%s\n", tz->type);
458}
459
460static ssize_t
461temp_show(struct device *dev, struct device_attribute *attr, char *buf)
462{
463    struct thermal_zone_device *tz = to_thermal_zone(dev);
464    long temperature;
465    int ret;
466
467    ret = thermal_zone_get_temp(tz, &temperature);
468
469    if (ret)
470        return ret;
471
472    return sprintf(buf, "%ld\n", temperature);
473}
474
475static ssize_t
476mode_show(struct device *dev, struct device_attribute *attr, char *buf)
477{
478    struct thermal_zone_device *tz = to_thermal_zone(dev);
479    enum thermal_device_mode mode;
480    int result;
481
482    if (!tz->ops->get_mode)
483        return -EPERM;
484
485    result = tz->ops->get_mode(tz, &mode);
486    if (result)
487        return result;
488
489    return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
490               : "disabled");
491}
492
493static ssize_t
494mode_store(struct device *dev, struct device_attribute *attr,
495       const char *buf, size_t count)
496{
497    struct thermal_zone_device *tz = to_thermal_zone(dev);
498    int result;
499
500    if (!tz->ops->set_mode)
501        return -EPERM;
502
503    if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
504        result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
505    else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
506        result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
507    else
508        result = -EINVAL;
509
510    if (result)
511        return result;
512
513    return count;
514}
515
516static ssize_t
517trip_point_type_show(struct device *dev, struct device_attribute *attr,
518             char *buf)
519{
520    struct thermal_zone_device *tz = to_thermal_zone(dev);
521    enum thermal_trip_type type;
522    int trip, result;
523
524    if (!tz->ops->get_trip_type)
525        return -EPERM;
526
527    if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
528        return -EINVAL;
529
530    result = tz->ops->get_trip_type(tz, trip, &type);
531    if (result)
532        return result;
533
534    switch (type) {
535    case THERMAL_TRIP_CRITICAL:
536        return sprintf(buf, "critical\n");
537    case THERMAL_TRIP_HOT:
538        return sprintf(buf, "hot\n");
539    case THERMAL_TRIP_PASSIVE:
540        return sprintf(buf, "passive\n");
541    case THERMAL_TRIP_ACTIVE:
542        return sprintf(buf, "active\n");
543    default:
544        return sprintf(buf, "unknown\n");
545    }
546}
547
548static ssize_t
549trip_point_temp_store(struct device *dev, struct device_attribute *attr,
550             const char *buf, size_t count)
551{
552    struct thermal_zone_device *tz = to_thermal_zone(dev);
553    int trip, ret;
554    unsigned long temperature;
555
556    if (!tz->ops->set_trip_temp)
557        return -EPERM;
558
559    if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
560        return -EINVAL;
561
562    if (kstrtoul(buf, 10, &temperature))
563        return -EINVAL;
564
565    ret = tz->ops->set_trip_temp(tz, trip, temperature);
566
567    return ret ? ret : count;
568}
569
570static ssize_t
571trip_point_temp_show(struct device *dev, struct device_attribute *attr,
572             char *buf)
573{
574    struct thermal_zone_device *tz = to_thermal_zone(dev);
575    int trip, ret;
576    long temperature;
577
578    if (!tz->ops->get_trip_temp)
579        return -EPERM;
580
581    if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
582        return -EINVAL;
583
584    ret = tz->ops->get_trip_temp(tz, trip, &temperature);
585
586    if (ret)
587        return ret;
588
589    return sprintf(buf, "%ld\n", temperature);
590}
591
592static ssize_t
593trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
594            const char *buf, size_t count)
595{
596    struct thermal_zone_device *tz = to_thermal_zone(dev);
597    int trip, ret;
598    unsigned long temperature;
599
600    if (!tz->ops->set_trip_hyst)
601        return -EPERM;
602
603    if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
604        return -EINVAL;
605
606    if (kstrtoul(buf, 10, &temperature))
607        return -EINVAL;
608
609    /*
610     * We are not doing any check on the 'temperature' value
611     * here. The driver implementing 'set_trip_hyst' has to
612     * take care of this.
613     */
614    ret = tz->ops->set_trip_hyst(tz, trip, temperature);
615
616    return ret ? ret : count;
617}
618
619static ssize_t
620trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
621            char *buf)
622{
623    struct thermal_zone_device *tz = to_thermal_zone(dev);
624    int trip, ret;
625    unsigned long temperature;
626
627    if (!tz->ops->get_trip_hyst)
628        return -EPERM;
629
630    if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
631        return -EINVAL;
632
633    ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
634
635    return ret ? ret : sprintf(buf, "%ld\n", temperature);
636}
637
638static ssize_t
639passive_store(struct device *dev, struct device_attribute *attr,
640            const char *buf, size_t count)
641{
642    struct thermal_zone_device *tz = to_thermal_zone(dev);
643    struct thermal_cooling_device *cdev = NULL;
644    int state;
645
646    if (!sscanf(buf, "%d\n", &state))
647        return -EINVAL;
648
649    /* sanity check: values below 1000 millicelcius don't make sense
650     * and can cause the system to go into a thermal heart attack
651     */
652    if (state && state < 1000)
653        return -EINVAL;
654
655    if (state && !tz->forced_passive) {
656        mutex_lock(&thermal_list_lock);
657        list_for_each_entry(cdev, &thermal_cdev_list, node) {
658            if (!strncmp("Processor", cdev->type,
659                     sizeof("Processor")))
660                thermal_zone_bind_cooling_device(tz,
661                        THERMAL_TRIPS_NONE, cdev,
662                        THERMAL_NO_LIMIT,
663                        THERMAL_NO_LIMIT);
664        }
665        mutex_unlock(&thermal_list_lock);
666        if (!tz->passive_delay)
667            tz->passive_delay = 1000;
668    } else if (!state && tz->forced_passive) {
669        mutex_lock(&thermal_list_lock);
670        list_for_each_entry(cdev, &thermal_cdev_list, node) {
671            if (!strncmp("Processor", cdev->type,
672                     sizeof("Processor")))
673                thermal_zone_unbind_cooling_device(tz,
674                                   THERMAL_TRIPS_NONE,
675                                   cdev);
676        }
677        mutex_unlock(&thermal_list_lock);
678        tz->passive_delay = 0;
679    }
680
681    tz->forced_passive = state;
682
683    thermal_zone_device_update(tz);
684
685    return count;
686}
687
688static ssize_t
689passive_show(struct device *dev, struct device_attribute *attr,
690           char *buf)
691{
692    struct thermal_zone_device *tz = to_thermal_zone(dev);
693
694    return sprintf(buf, "%d\n", tz->forced_passive);
695}
696
697static ssize_t
698policy_store(struct device *dev, struct device_attribute *attr,
699            const char *buf, size_t count)
700{
701    int ret = -EINVAL;
702    struct thermal_zone_device *tz = to_thermal_zone(dev);
703    struct thermal_governor *gov;
704
705    mutex_lock(&thermal_governor_lock);
706
707    gov = __find_governor(buf);
708    if (!gov)
709        goto exit;
710
711    tz->governor = gov;
712    ret = count;
713
714exit:
715    mutex_unlock(&thermal_governor_lock);
716    return ret;
717}
718
719static ssize_t
720policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
721{
722    struct thermal_zone_device *tz = to_thermal_zone(dev);
723
724    return sprintf(buf, "%s\n", tz->governor->name);
725}
726
727#ifdef CONFIG_THERMAL_EMULATION
728static ssize_t
729emul_temp_store(struct device *dev, struct device_attribute *attr,
730             const char *buf, size_t count)
731{
732    struct thermal_zone_device *tz = to_thermal_zone(dev);
733    int ret = 0;
734    unsigned long temperature;
735
736    if (kstrtoul(buf, 10, &temperature))
737        return -EINVAL;
738
739    if (!tz->ops->set_emul_temp) {
740        mutex_lock(&tz->lock);
741        tz->emul_temperature = temperature;
742        mutex_unlock(&tz->lock);
743    } else {
744        ret = tz->ops->set_emul_temp(tz, temperature);
745    }
746
747    return ret ? ret : count;
748}
749static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
750#endif/*CONFIG_THERMAL_EMULATION*/
751
752static DEVICE_ATTR(type, 0444, type_show, NULL);
753static DEVICE_ATTR(temp, 0444, temp_show, NULL);
754static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
755static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
756static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
757
758/* sys I/F for cooling device */
759#define to_cooling_device(_dev) \
760    container_of(_dev, struct thermal_cooling_device, device)
761
762static ssize_t
763thermal_cooling_device_type_show(struct device *dev,
764                 struct device_attribute *attr, char *buf)
765{
766    struct thermal_cooling_device *cdev = to_cooling_device(dev);
767
768    return sprintf(buf, "%s\n", cdev->type);
769}
770
771static ssize_t
772thermal_cooling_device_max_state_show(struct device *dev,
773                      struct device_attribute *attr, char *buf)
774{
775    struct thermal_cooling_device *cdev = to_cooling_device(dev);
776    unsigned long state;
777    int ret;
778
779    ret = cdev->ops->get_max_state(cdev, &state);
780    if (ret)
781        return ret;
782    return sprintf(buf, "%ld\n", state);
783}
784
785static ssize_t
786thermal_cooling_device_cur_state_show(struct device *dev,
787                      struct device_attribute *attr, char *buf)
788{
789    struct thermal_cooling_device *cdev = to_cooling_device(dev);
790    unsigned long state;
791    int ret;
792
793    ret = cdev->ops->get_cur_state(cdev, &state);
794    if (ret)
795        return ret;
796    return sprintf(buf, "%ld\n", state);
797}
798
799static ssize_t
800thermal_cooling_device_cur_state_store(struct device *dev,
801                       struct device_attribute *attr,
802                       const char *buf, size_t count)
803{
804    struct thermal_cooling_device *cdev = to_cooling_device(dev);
805    unsigned long state;
806    int result;
807
808    if (!sscanf(buf, "%ld\n", &state))
809        return -EINVAL;
810
811    if ((long)state < 0)
812        return -EINVAL;
813
814    result = cdev->ops->set_cur_state(cdev, state);
815    if (result)
816        return result;
817    return count;
818}
819
820static struct device_attribute dev_attr_cdev_type =
821__ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
822static DEVICE_ATTR(max_state, 0444,
823           thermal_cooling_device_max_state_show, NULL);
824static DEVICE_ATTR(cur_state, 0644,
825           thermal_cooling_device_cur_state_show,
826           thermal_cooling_device_cur_state_store);
827
828static ssize_t
829thermal_cooling_device_trip_point_show(struct device *dev,
830                       struct device_attribute *attr, char *buf)
831{
832    struct thermal_instance *instance;
833
834    instance =
835        container_of(attr, struct thermal_instance, attr);
836
837    if (instance->trip == THERMAL_TRIPS_NONE)
838        return sprintf(buf, "-1\n");
839    else
840        return sprintf(buf, "%d\n", instance->trip);
841}
842
843/* Device management */
844
845#if defined(CONFIG_THERMAL_HWMON)
846
847/* hwmon sys I/F */
848#include <linux/hwmon.h>
849
850/* thermal zone devices with the same type share one hwmon device */
851struct thermal_hwmon_device {
852    char type[THERMAL_NAME_LENGTH];
853    struct device *device;
854    int count;
855    struct list_head tz_list;
856    struct list_head node;
857};
858
859struct thermal_hwmon_attr {
860    struct device_attribute attr;
861    char name[16];
862};
863
864/* one temperature input for each thermal zone */
865struct thermal_hwmon_temp {
866    struct list_head hwmon_node;
867    struct thermal_zone_device *tz;
868    struct thermal_hwmon_attr temp_input; /* hwmon sys attr */
869    struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */
870};
871
872static LIST_HEAD(thermal_hwmon_list);
873
874static ssize_t
875name_show(struct device *dev, struct device_attribute *attr, char *buf)
876{
877    struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
878    return sprintf(buf, "%s\n", hwmon->type);
879}
880static DEVICE_ATTR(name, 0444, name_show, NULL);
881
882static ssize_t
883temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
884{
885    long temperature;
886    int ret;
887    struct thermal_hwmon_attr *hwmon_attr
888            = container_of(attr, struct thermal_hwmon_attr, attr);
889    struct thermal_hwmon_temp *temp
890            = container_of(hwmon_attr, struct thermal_hwmon_temp,
891                       temp_input);
892    struct thermal_zone_device *tz = temp->tz;
893
894    ret = thermal_zone_get_temp(tz, &temperature);
895
896    if (ret)
897        return ret;
898
899    return sprintf(buf, "%ld\n", temperature);
900}
901
902static ssize_t
903temp_crit_show(struct device *dev, struct device_attribute *attr,
904        char *buf)
905{
906    struct thermal_hwmon_attr *hwmon_attr
907            = container_of(attr, struct thermal_hwmon_attr, attr);
908    struct thermal_hwmon_temp *temp
909            = container_of(hwmon_attr, struct thermal_hwmon_temp,
910                       temp_crit);
911    struct thermal_zone_device *tz = temp->tz;
912    long temperature;
913    int ret;
914
915    ret = tz->ops->get_trip_temp(tz, 0, &temperature);
916    if (ret)
917        return ret;
918
919    return sprintf(buf, "%ld\n", temperature);
920}
921
922
923static struct thermal_hwmon_device *
924thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
925{
926    struct thermal_hwmon_device *hwmon;
927
928    mutex_lock(&thermal_list_lock);
929    list_for_each_entry(hwmon, &thermal_hwmon_list, node)
930        if (!strcmp(hwmon->type, tz->type)) {
931            mutex_unlock(&thermal_list_lock);
932            return hwmon;
933        }
934    mutex_unlock(&thermal_list_lock);
935
936    return NULL;
937}
938
939/* Find the temperature input matching a given thermal zone */
940static struct thermal_hwmon_temp *
941thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
942              const struct thermal_zone_device *tz)
943{
944    struct thermal_hwmon_temp *temp;
945
946    mutex_lock(&thermal_list_lock);
947    list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
948        if (temp->tz == tz) {
949            mutex_unlock(&thermal_list_lock);
950            return temp;
951        }
952    mutex_unlock(&thermal_list_lock);
953
954    return NULL;
955}
956
957static int
958thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
959{
960    struct thermal_hwmon_device *hwmon;
961    struct thermal_hwmon_temp *temp;
962    int new_hwmon_device = 1;
963    int result;
964
965    hwmon = thermal_hwmon_lookup_by_type(tz);
966    if (hwmon) {
967        new_hwmon_device = 0;
968        goto register_sys_interface;
969    }
970
971    hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
972    if (!hwmon)
973        return -ENOMEM;
974
975    INIT_LIST_HEAD(&hwmon->tz_list);
976    strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
977    hwmon->device = hwmon_device_register(NULL);
978    if (IS_ERR(hwmon->device)) {
979        result = PTR_ERR(hwmon->device);
980        goto free_mem;
981    }
982    dev_set_drvdata(hwmon->device, hwmon);
983    result = device_create_file(hwmon->device, &dev_attr_name);
984    if (result)
985        goto free_mem;
986
987 register_sys_interface:
988    temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
989    if (!temp) {
990        result = -ENOMEM;
991        goto unregister_name;
992    }
993
994    temp->tz = tz;
995    hwmon->count++;
996
997    snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
998         "temp%d_input", hwmon->count);
999    temp->temp_input.attr.attr.name = temp->temp_input.name;
1000    temp->temp_input.attr.attr.mode = 0444;
1001    temp->temp_input.attr.show = temp_input_show;
1002    sysfs_attr_init(&temp->temp_input.attr.attr);
1003    result = device_create_file(hwmon->device, &temp->temp_input.attr);
1004    if (result)
1005        goto free_temp_mem;
1006
1007    if (tz->ops->get_crit_temp) {
1008        unsigned long temperature;
1009        if (!tz->ops->get_crit_temp(tz, &temperature)) {
1010            snprintf(temp->temp_crit.name,
1011                 sizeof(temp->temp_crit.name),
1012                "temp%d_crit", hwmon->count);
1013            temp->temp_crit.attr.attr.name = temp->temp_crit.name;
1014            temp->temp_crit.attr.attr.mode = 0444;
1015            temp->temp_crit.attr.show = temp_crit_show;
1016            sysfs_attr_init(&temp->temp_crit.attr.attr);
1017            result = device_create_file(hwmon->device,
1018                            &temp->temp_crit.attr);
1019            if (result)
1020                goto unregister_input;
1021        }
1022    }
1023
1024    mutex_lock(&thermal_list_lock);
1025    if (new_hwmon_device)
1026        list_add_tail(&hwmon->node, &thermal_hwmon_list);
1027    list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
1028    mutex_unlock(&thermal_list_lock);
1029
1030    return 0;
1031
1032 unregister_input:
1033    device_remove_file(hwmon->device, &temp->temp_input.attr);
1034 free_temp_mem:
1035    kfree(temp);
1036 unregister_name:
1037    if (new_hwmon_device) {
1038        device_remove_file(hwmon->device, &dev_attr_name);
1039        hwmon_device_unregister(hwmon->device);
1040    }
1041 free_mem:
1042    if (new_hwmon_device)
1043        kfree(hwmon);
1044
1045    return result;
1046}
1047
1048static void
1049thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
1050{
1051    struct thermal_hwmon_device *hwmon;
1052    struct thermal_hwmon_temp *temp;
1053
1054    hwmon = thermal_hwmon_lookup_by_type(tz);
1055    if (unlikely(!hwmon)) {
1056        /* Should never happen... */
1057        dev_dbg(&tz->device, "hwmon device lookup failed!\n");
1058        return;
1059    }
1060
1061    temp = thermal_hwmon_lookup_temp(hwmon, tz);
1062    if (unlikely(!temp)) {
1063        /* Should never happen... */
1064        dev_dbg(&tz->device, "temperature input lookup failed!\n");
1065        return;
1066    }
1067
1068    device_remove_file(hwmon->device, &temp->temp_input.attr);
1069    if (tz->ops->get_crit_temp)
1070        device_remove_file(hwmon->device, &temp->temp_crit.attr);
1071
1072    mutex_lock(&thermal_list_lock);
1073    list_del(&temp->hwmon_node);
1074    kfree(temp);
1075    if (!list_empty(&hwmon->tz_list)) {
1076        mutex_unlock(&thermal_list_lock);
1077        return;
1078    }
1079    list_del(&hwmon->node);
1080    mutex_unlock(&thermal_list_lock);
1081
1082    device_remove_file(hwmon->device, &dev_attr_name);
1083    hwmon_device_unregister(hwmon->device);
1084    kfree(hwmon);
1085}
1086#else
1087static int
1088thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
1089{
1090    return 0;
1091}
1092
1093static void
1094thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
1095{
1096}
1097#endif
1098
1099/**
1100 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
1101 * @tz: thermal zone device
1102 * @trip: indicates which trip point the cooling devices is
1103 * associated with in this thermal zone.
1104 * @cdev: thermal cooling device
1105 *
1106 * This function is usually called in the thermal zone device .bind callback.
1107 */
1108int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1109                     int trip,
1110                     struct thermal_cooling_device *cdev,
1111                     unsigned long upper, unsigned long lower)
1112{
1113    struct thermal_instance *dev;
1114    struct thermal_instance *pos;
1115    struct thermal_zone_device *pos1;
1116    struct thermal_cooling_device *pos2;
1117    unsigned long max_state;
1118    int result;
1119
1120    if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1121        return -EINVAL;
1122
1123    list_for_each_entry(pos1, &thermal_tz_list, node) {
1124        if (pos1 == tz)
1125            break;
1126    }
1127    list_for_each_entry(pos2, &thermal_cdev_list, node) {
1128        if (pos2 == cdev)
1129            break;
1130    }
1131
1132    if (tz != pos1 || cdev != pos2)
1133        return -EINVAL;
1134
1135    cdev->ops->get_max_state(cdev, &max_state);
1136
1137    /* lower default 0, upper default max_state */
1138    lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1139    upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1140
1141    if (lower > upper || upper > max_state)
1142        return -EINVAL;
1143
1144    dev =
1145        kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1146    if (!dev)
1147        return -ENOMEM;
1148    dev->tz = tz;
1149    dev->cdev = cdev;
1150    dev->trip = trip;
1151    dev->upper = upper;
1152    dev->lower = lower;
1153    dev->target = THERMAL_NO_TARGET;
1154
1155    result = get_idr(&tz->idr, &tz->lock, &dev->id);
1156    if (result)
1157        goto free_mem;
1158
1159    sprintf(dev->name, "cdev%d", dev->id);
1160    result =
1161        sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1162    if (result)
1163        goto release_idr;
1164
1165    sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1166    sysfs_attr_init(&dev->attr.attr);
1167    dev->attr.attr.name = dev->attr_name;
1168    dev->attr.attr.mode = 0444;
1169    dev->attr.show = thermal_cooling_device_trip_point_show;
1170    result = device_create_file(&tz->device, &dev->attr);
1171    if (result)
1172        goto remove_symbol_link;
1173
1174    mutex_lock(&tz->lock);
1175    mutex_lock(&cdev->lock);
1176    list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1177        if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1178        result = -EEXIST;
1179        break;
1180    }
1181    if (!result) {
1182        list_add_tail(&dev->tz_node, &tz->thermal_instances);
1183        list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1184    }
1185    mutex_unlock(&cdev->lock);
1186    mutex_unlock(&tz->lock);
1187
1188    if (!result)
1189        return 0;
1190
1191    device_remove_file(&tz->device, &dev->attr);
1192remove_symbol_link:
1193    sysfs_remove_link(&tz->device.kobj, dev->name);
1194release_idr:
1195    release_idr(&tz->idr, &tz->lock, dev->id);
1196free_mem:
1197    kfree(dev);
1198    return result;
1199}
1200EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
1201
1202/**
1203 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
1204 * @tz: thermal zone device
1205 * @trip: indicates which trip point the cooling devices is
1206 * associated with in this thermal zone.
1207 * @cdev: thermal cooling device
1208 *
1209 * This function is usually called in the thermal zone device .unbind callback.
1210 */
1211int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1212                       int trip,
1213                       struct thermal_cooling_device *cdev)
1214{
1215    struct thermal_instance *pos, *next;
1216
1217    mutex_lock(&tz->lock);
1218    mutex_lock(&cdev->lock);
1219    list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1220        if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1221            list_del(&pos->tz_node);
1222            list_del(&pos->cdev_node);
1223            mutex_unlock(&cdev->lock);
1224            mutex_unlock(&tz->lock);
1225            goto unbind;
1226        }
1227    }
1228    mutex_unlock(&cdev->lock);
1229    mutex_unlock(&tz->lock);
1230
1231    return -ENODEV;
1232
1233unbind:
1234    device_remove_file(&tz->device, &pos->attr);
1235    sysfs_remove_link(&tz->device.kobj, pos->name);
1236    release_idr(&tz->idr, &tz->lock, pos->id);
1237    kfree(pos);
1238    return 0;
1239}
1240EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
1241
1242static void thermal_release(struct device *dev)
1243{
1244    struct thermal_zone_device *tz;
1245    struct thermal_cooling_device *cdev;
1246
1247    if (!strncmp(dev_name(dev), "thermal_zone",
1248             sizeof("thermal_zone") - 1)) {
1249        tz = to_thermal_zone(dev);
1250        kfree(tz);
1251    } else {
1252        cdev = to_cooling_device(dev);
1253        kfree(cdev);
1254    }
1255}
1256
1257static struct class thermal_class = {
1258    .name = "thermal",
1259    .dev_release = thermal_release,
1260};
1261
1262/**
1263 * thermal_cooling_device_register - register a new thermal cooling device
1264 * @type: the thermal cooling device type.
1265 * @devdata: device private data.
1266 * @ops: standard thermal cooling devices callbacks.
1267 */
1268struct thermal_cooling_device *
1269thermal_cooling_device_register(char *type, void *devdata,
1270                const struct thermal_cooling_device_ops *ops)
1271{
1272    struct thermal_cooling_device *cdev;
1273    int result;
1274
1275    if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1276        return ERR_PTR(-EINVAL);
1277
1278    if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1279        !ops->set_cur_state)
1280        return ERR_PTR(-EINVAL);
1281
1282    cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1283    if (!cdev)
1284        return ERR_PTR(-ENOMEM);
1285
1286    result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1287    if (result) {
1288        kfree(cdev);
1289        return ERR_PTR(result);
1290    }
1291
1292    strcpy(cdev->type, type ? : "");
1293    mutex_init(&cdev->lock);
1294    INIT_LIST_HEAD(&cdev->thermal_instances);
1295    cdev->ops = ops;
1296    cdev->updated = true;
1297    cdev->device.class = &thermal_class;
1298    cdev->devdata = devdata;
1299    dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1300    result = device_register(&cdev->device);
1301    if (result) {
1302        release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1303        kfree(cdev);
1304        return ERR_PTR(result);
1305    }
1306
1307    /* sys I/F */
1308    if (type) {
1309        result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1310        if (result)
1311            goto unregister;
1312    }
1313
1314    result = device_create_file(&cdev->device, &dev_attr_max_state);
1315    if (result)
1316        goto unregister;
1317
1318    result = device_create_file(&cdev->device, &dev_attr_cur_state);
1319    if (result)
1320        goto unregister;
1321
1322    /* Add 'this' new cdev to the global cdev list */
1323    mutex_lock(&thermal_list_lock);
1324    list_add(&cdev->node, &thermal_cdev_list);
1325    mutex_unlock(&thermal_list_lock);
1326
1327    /* Update binding information for 'this' new cdev */
1328    bind_cdev(cdev);
1329
1330    return cdev;
1331
1332unregister:
1333    release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1334    device_unregister(&cdev->device);
1335    return ERR_PTR(result);
1336}
1337EXPORT_SYMBOL(thermal_cooling_device_register);
1338
1339/**
1340 * thermal_cooling_device_unregister - removes the registered thermal cooling device
1341 * @cdev: the thermal cooling device to remove.
1342 *
1343 * thermal_cooling_device_unregister() must be called when the device is no
1344 * longer needed.
1345 */
1346void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1347{
1348    int i;
1349    const struct thermal_zone_params *tzp;
1350    struct thermal_zone_device *tz;
1351    struct thermal_cooling_device *pos = NULL;
1352
1353    if (!cdev)
1354        return;
1355
1356    mutex_lock(&thermal_list_lock);
1357    list_for_each_entry(pos, &thermal_cdev_list, node)
1358        if (pos == cdev)
1359        break;
1360    if (pos != cdev) {
1361        /* thermal cooling device not found */
1362        mutex_unlock(&thermal_list_lock);
1363        return;
1364    }
1365    list_del(&cdev->node);
1366
1367    /* Unbind all thermal zones associated with 'this' cdev */
1368    list_for_each_entry(tz, &thermal_tz_list, node) {
1369        if (tz->ops->unbind) {
1370            tz->ops->unbind(tz, cdev);
1371            continue;
1372        }
1373
1374        if (!tz->tzp || !tz->tzp->tbp)
1375            continue;
1376
1377        tzp = tz->tzp;
1378        for (i = 0; i < tzp->num_tbps; i++) {
1379            if (tzp->tbp[i].cdev == cdev) {
1380                __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1381                tzp->tbp[i].cdev = NULL;
1382            }
1383        }
1384    }
1385
1386    mutex_unlock(&thermal_list_lock);
1387
1388    if (cdev->type[0])
1389        device_remove_file(&cdev->device, &dev_attr_cdev_type);
1390    device_remove_file(&cdev->device, &dev_attr_max_state);
1391    device_remove_file(&cdev->device, &dev_attr_cur_state);
1392
1393    release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1394    device_unregister(&cdev->device);
1395    return;
1396}
1397EXPORT_SYMBOL(thermal_cooling_device_unregister);
1398
1399void thermal_cdev_update(struct thermal_cooling_device *cdev)
1400{
1401    struct thermal_instance *instance;
1402    unsigned long target = 0;
1403
1404    /* cooling device is updated*/
1405    if (cdev->updated)
1406        return;
1407
1408    mutex_lock(&cdev->lock);
1409    /* Make sure cdev enters the deepest cooling state */
1410    list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1411        if (instance->target == THERMAL_NO_TARGET)
1412            continue;
1413        if (instance->target > target)
1414            target = instance->target;
1415    }
1416    mutex_unlock(&cdev->lock);
1417    cdev->ops->set_cur_state(cdev, target);
1418    cdev->updated = true;
1419}
1420EXPORT_SYMBOL(thermal_cdev_update);
1421
1422/**
1423 * notify_thermal_framework - Sensor drivers use this API to notify framework
1424 * @tz: thermal zone device
1425 * @trip: indicates which trip point has been crossed
1426 *
1427 * This function handles the trip events from sensor drivers. It starts
1428 * throttling the cooling devices according to the policy configured.
1429 * For CRITICAL and HOT trip points, this notifies the respective drivers,
1430 * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1431 * The throttling policy is based on the configured platform data; if no
1432 * platform data is provided, this uses the step_wise throttling policy.
1433 */
1434void notify_thermal_framework(struct thermal_zone_device *tz, int trip)
1435{
1436    handle_thermal_trip(tz, trip);
1437}
1438EXPORT_SYMBOL(notify_thermal_framework);
1439
1440/**
1441 * create_trip_attrs - create attributes for trip points
1442 * @tz: the thermal zone device
1443 * @mask: Writeable trip point bitmap.
1444 */
1445static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1446{
1447    int indx;
1448    int size = sizeof(struct thermal_attr) * tz->trips;
1449
1450    tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1451    if (!tz->trip_type_attrs)
1452        return -ENOMEM;
1453
1454    tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1455    if (!tz->trip_temp_attrs) {
1456        kfree(tz->trip_type_attrs);
1457        return -ENOMEM;
1458    }
1459
1460    if (tz->ops->get_trip_hyst) {
1461        tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1462        if (!tz->trip_hyst_attrs) {
1463            kfree(tz->trip_type_attrs);
1464            kfree(tz->trip_temp_attrs);
1465            return -ENOMEM;
1466        }
1467    }
1468
1469
1470    for (indx = 0; indx < tz->trips; indx++) {
1471        /* create trip type attribute */
1472        snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1473             "trip_point_%d_type", indx);
1474
1475        sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1476        tz->trip_type_attrs[indx].attr.attr.name =
1477                        tz->trip_type_attrs[indx].name;
1478        tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1479        tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1480
1481        device_create_file(&tz->device,
1482                   &tz->trip_type_attrs[indx].attr);
1483
1484        /* create trip temp attribute */
1485        snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1486             "trip_point_%d_temp", indx);
1487
1488        sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1489        tz->trip_temp_attrs[indx].attr.attr.name =
1490                        tz->trip_temp_attrs[indx].name;
1491        tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1492        tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1493        if (mask & (1 << indx)) {
1494            tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1495            tz->trip_temp_attrs[indx].attr.store =
1496                            trip_point_temp_store;
1497        }
1498
1499        device_create_file(&tz->device,
1500                   &tz->trip_temp_attrs[indx].attr);
1501
1502        /* create Optional trip hyst attribute */
1503        if (!tz->ops->get_trip_hyst)
1504            continue;
1505        snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1506             "trip_point_%d_hyst", indx);
1507
1508        sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1509        tz->trip_hyst_attrs[indx].attr.attr.name =
1510                    tz->trip_hyst_attrs[indx].name;
1511        tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1512        tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1513        if (tz->ops->set_trip_hyst) {
1514            tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1515            tz->trip_hyst_attrs[indx].attr.store =
1516                    trip_point_hyst_store;
1517        }
1518
1519        device_create_file(&tz->device,
1520                   &tz->trip_hyst_attrs[indx].attr);
1521    }
1522    return 0;
1523}
1524
1525static void remove_trip_attrs(struct thermal_zone_device *tz)
1526{
1527    int indx;
1528
1529    for (indx = 0; indx < tz->trips; indx++) {
1530        device_remove_file(&tz->device,
1531                   &tz->trip_type_attrs[indx].attr);
1532        device_remove_file(&tz->device,
1533                   &tz->trip_temp_attrs[indx].attr);
1534        if (tz->ops->get_trip_hyst)
1535            device_remove_file(&tz->device,
1536                  &tz->trip_hyst_attrs[indx].attr);
1537    }
1538    kfree(tz->trip_type_attrs);
1539    kfree(tz->trip_temp_attrs);
1540    kfree(tz->trip_hyst_attrs);
1541}
1542
1543/**
1544 * thermal_zone_device_register - register a new thermal zone device
1545 * @type: the thermal zone device type
1546 * @trips: the number of trip points the thermal zone support
1547 * @mask: a bit string indicating the writeablility of trip points
1548 * @devdata: private device data
1549 * @ops: standard thermal zone device callbacks
1550 * @tzp: thermal zone platform parameters
1551 * @passive_delay: number of milliseconds to wait between polls when
1552 * performing passive cooling
1553 * @polling_delay: number of milliseconds to wait between polls when checking
1554 * whether trip points have been crossed (0 for interrupt
1555 * driven systems)
1556 *
1557 * thermal_zone_device_unregister() must be called when the device is no
1558 * longer needed. The passive cooling depends on the .get_trend() return value.
1559 */
1560struct thermal_zone_device *thermal_zone_device_register(const char *type,
1561    int trips, int mask, void *devdata,
1562    const struct thermal_zone_device_ops *ops,
1563    const struct thermal_zone_params *tzp,
1564    int passive_delay, int polling_delay)
1565{
1566    struct thermal_zone_device *tz;
1567    enum thermal_trip_type trip_type;
1568    int result;
1569    int count;
1570    int passive = 0;
1571
1572    if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1573        return ERR_PTR(-EINVAL);
1574
1575    if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1576        return ERR_PTR(-EINVAL);
1577
1578    if (!ops || !ops->get_temp)
1579        return ERR_PTR(-EINVAL);
1580
1581    if (trips > 0 && !ops->get_trip_type)
1582        return ERR_PTR(-EINVAL);
1583
1584    tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1585    if (!tz)
1586        return ERR_PTR(-ENOMEM);
1587
1588    INIT_LIST_HEAD(&tz->thermal_instances);
1589    idr_init(&tz->idr);
1590    mutex_init(&tz->lock);
1591    result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1592    if (result) {
1593        kfree(tz);
1594        return ERR_PTR(result);
1595    }
1596
1597    strcpy(tz->type, type ? : "");
1598    tz->ops = ops;
1599    tz->tzp = tzp;
1600    tz->device.class = &thermal_class;
1601    tz->devdata = devdata;
1602    tz->trips = trips;
1603    tz->passive_delay = passive_delay;
1604    tz->polling_delay = polling_delay;
1605
1606    dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1607    result = device_register(&tz->device);
1608    if (result) {
1609        release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1610        kfree(tz);
1611        return ERR_PTR(result);
1612    }
1613
1614    /* sys I/F */
1615    if (type) {
1616        result = device_create_file(&tz->device, &dev_attr_type);
1617        if (result)
1618            goto unregister;
1619    }
1620
1621    result = device_create_file(&tz->device, &dev_attr_temp);
1622    if (result)
1623        goto unregister;
1624
1625    if (ops->get_mode) {
1626        result = device_create_file(&tz->device, &dev_attr_mode);
1627        if (result)
1628            goto unregister;
1629    }
1630
1631    result = create_trip_attrs(tz, mask);
1632    if (result)
1633        goto unregister;
1634
1635    for (count = 0; count < trips; count++) {
1636        tz->ops->get_trip_type(tz, count, &trip_type);
1637        if (trip_type == THERMAL_TRIP_PASSIVE)
1638            passive = 1;
1639    }
1640
1641    if (!passive) {
1642        result = device_create_file(&tz->device, &dev_attr_passive);
1643        if (result)
1644            goto unregister;
1645    }
1646
1647#ifdef CONFIG_THERMAL_EMULATION
1648    result = device_create_file(&tz->device, &dev_attr_emul_temp);
1649    if (result)
1650        goto unregister;
1651#endif
1652    /* Create policy attribute */
1653    result = device_create_file(&tz->device, &dev_attr_policy);
1654    if (result)
1655        goto unregister;
1656
1657    /* Update 'this' zone's governor information */
1658    mutex_lock(&thermal_governor_lock);
1659
1660    if (tz->tzp)
1661        tz->governor = __find_governor(tz->tzp->governor_name);
1662    else
1663        tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
1664
1665    mutex_unlock(&thermal_governor_lock);
1666
1667    result = thermal_add_hwmon_sysfs(tz);
1668    if (result)
1669        goto unregister;
1670
1671    mutex_lock(&thermal_list_lock);
1672    list_add_tail(&tz->node, &thermal_tz_list);
1673    mutex_unlock(&thermal_list_lock);
1674
1675    /* Bind cooling devices for this zone */
1676    bind_tz(tz);
1677
1678    INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1679
1680    thermal_zone_device_update(tz);
1681
1682    if (!result)
1683        return tz;
1684
1685unregister:
1686    release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1687    device_unregister(&tz->device);
1688    return ERR_PTR(result);
1689}
1690EXPORT_SYMBOL(thermal_zone_device_register);
1691
1692/**
1693 * thermal_device_unregister - removes the registered thermal zone device
1694 * @tz: the thermal zone device to remove
1695 */
1696void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1697{
1698    int i;
1699    const struct thermal_zone_params *tzp;
1700    struct thermal_cooling_device *cdev;
1701    struct thermal_zone_device *pos = NULL;
1702
1703    if (!tz)
1704        return;
1705
1706    tzp = tz->tzp;
1707
1708    mutex_lock(&thermal_list_lock);
1709    list_for_each_entry(pos, &thermal_tz_list, node)
1710        if (pos == tz)
1711        break;
1712    if (pos != tz) {
1713        /* thermal zone device not found */
1714        mutex_unlock(&thermal_list_lock);
1715        return;
1716    }
1717    list_del(&tz->node);
1718
1719    /* Unbind all cdevs associated with 'this' thermal zone */
1720    list_for_each_entry(cdev, &thermal_cdev_list, node) {
1721        if (tz->ops->unbind) {
1722            tz->ops->unbind(tz, cdev);
1723            continue;
1724        }
1725
1726        if (!tzp || !tzp->tbp)
1727            break;
1728
1729        for (i = 0; i < tzp->num_tbps; i++) {
1730            if (tzp->tbp[i].cdev == cdev) {
1731                __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1732                tzp->tbp[i].cdev = NULL;
1733            }
1734        }
1735    }
1736
1737    mutex_unlock(&thermal_list_lock);
1738
1739    thermal_zone_device_set_polling(tz, 0);
1740
1741    if (tz->type[0])
1742        device_remove_file(&tz->device, &dev_attr_type);
1743    device_remove_file(&tz->device, &dev_attr_temp);
1744    if (tz->ops->get_mode)
1745        device_remove_file(&tz->device, &dev_attr_mode);
1746    device_remove_file(&tz->device, &dev_attr_policy);
1747    remove_trip_attrs(tz);
1748    tz->governor = NULL;
1749
1750    thermal_remove_hwmon_sysfs(tz);
1751    release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1752    idr_destroy(&tz->idr);
1753    mutex_destroy(&tz->lock);
1754    device_unregister(&tz->device);
1755    return;
1756}
1757EXPORT_SYMBOL(thermal_zone_device_unregister);
1758
1759#ifdef CONFIG_NET
1760static struct genl_family thermal_event_genl_family = {
1761    .id = GENL_ID_GENERATE,
1762    .name = THERMAL_GENL_FAMILY_NAME,
1763    .version = THERMAL_GENL_VERSION,
1764    .maxattr = THERMAL_GENL_ATTR_MAX,
1765};
1766
1767static struct genl_multicast_group thermal_event_mcgrp = {
1768    .name = THERMAL_GENL_MCAST_GROUP_NAME,
1769};
1770
1771int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1772                    enum events event)
1773{
1774    struct sk_buff *skb;
1775    struct nlattr *attr;
1776    struct thermal_genl_event *thermal_event;
1777    void *msg_header;
1778    int size;
1779    int result;
1780    static unsigned int thermal_event_seqnum;
1781
1782    if (!tz)
1783        return -EINVAL;
1784
1785    /* allocate memory */
1786    size = nla_total_size(sizeof(struct thermal_genl_event)) +
1787           nla_total_size(0);
1788
1789    skb = genlmsg_new(size, GFP_ATOMIC);
1790    if (!skb)
1791        return -ENOMEM;
1792
1793    /* add the genetlink message header */
1794    msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1795                 &thermal_event_genl_family, 0,
1796                 THERMAL_GENL_CMD_EVENT);
1797    if (!msg_header) {
1798        nlmsg_free(skb);
1799        return -ENOMEM;
1800    }
1801
1802    /* fill the data */
1803    attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1804               sizeof(struct thermal_genl_event));
1805
1806    if (!attr) {
1807        nlmsg_free(skb);
1808        return -EINVAL;
1809    }
1810
1811    thermal_event = nla_data(attr);
1812    if (!thermal_event) {
1813        nlmsg_free(skb);
1814        return -EINVAL;
1815    }
1816
1817    memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1818
1819    thermal_event->orig = tz->id;
1820    thermal_event->event = event;
1821
1822    /* send multicast genetlink message */
1823    result = genlmsg_end(skb, msg_header);
1824    if (result < 0) {
1825        nlmsg_free(skb);
1826        return result;
1827    }
1828
1829    result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1830    if (result)
1831        dev_err(&tz->device, "Failed to send netlink event:%d", result);
1832
1833    return result;
1834}
1835EXPORT_SYMBOL(thermal_generate_netlink_event);
1836
1837static int genetlink_init(void)
1838{
1839    int result;
1840
1841    result = genl_register_family(&thermal_event_genl_family);
1842    if (result)
1843        return result;
1844
1845    result = genl_register_mc_group(&thermal_event_genl_family,
1846                    &thermal_event_mcgrp);
1847    if (result)
1848        genl_unregister_family(&thermal_event_genl_family);
1849    return result;
1850}
1851
1852static void genetlink_exit(void)
1853{
1854    genl_unregister_family(&thermal_event_genl_family);
1855}
1856#else /* !CONFIG_NET */
1857static inline int genetlink_init(void) { return 0; }
1858static inline void genetlink_exit(void) {}
1859#endif /* !CONFIG_NET */
1860
1861static int __init thermal_init(void)
1862{
1863    int result = 0;
1864
1865    result = class_register(&thermal_class);
1866    if (result) {
1867        idr_destroy(&thermal_tz_idr);
1868        idr_destroy(&thermal_cdev_idr);
1869        mutex_destroy(&thermal_idr_lock);
1870        mutex_destroy(&thermal_list_lock);
1871        return result;
1872    }
1873    result = genetlink_init();
1874    return result;
1875}
1876
1877static void __exit thermal_exit(void)
1878{
1879    class_unregister(&thermal_class);
1880    idr_destroy(&thermal_tz_idr);
1881    idr_destroy(&thermal_cdev_idr);
1882    mutex_destroy(&thermal_idr_lock);
1883    mutex_destroy(&thermal_list_lock);
1884    genetlink_exit();
1885}
1886
1887fs_initcall(thermal_init);
1888module_exit(thermal_exit);
1889

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