summaryrefslogtreecommitdiff
path: root/drivers/thermal/thermal_netlink.c
blob: 332052e24a86c07a7b3af1f9a5c280d08b6374a8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright 2020 Linaro Limited
 *
 * Author: Daniel Lezcano <daniel.lezcano@linaro.org>
 *
 * Generic netlink for thermal management framework
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <net/genetlink.h>
#include <uapi/linux/thermal.h>

#include "thermal_core.h"

enum thermal_genl_multicast_groups {
	THERMAL_GENL_SAMPLING_GROUP = 0,
	THERMAL_GENL_EVENT_GROUP = 1,
};

static const struct genl_multicast_group thermal_genl_mcgrps[] = {
	[THERMAL_GENL_SAMPLING_GROUP] = { .name = THERMAL_GENL_SAMPLING_GROUP_NAME, },
	[THERMAL_GENL_EVENT_GROUP]  = { .name = THERMAL_GENL_EVENT_GROUP_NAME,  },
};

static const struct nla_policy thermal_genl_policy[THERMAL_GENL_ATTR_MAX + 1] = {
	/* Thermal zone */
	[THERMAL_GENL_ATTR_TZ]			= { .type = NLA_NESTED },
	[THERMAL_GENL_ATTR_TZ_ID]		= { .type = NLA_U32 },
	[THERMAL_GENL_ATTR_TZ_TEMP]		= { .type = NLA_U32 },
	[THERMAL_GENL_ATTR_TZ_TRIP]		= { .type = NLA_NESTED },
	[THERMAL_GENL_ATTR_TZ_TRIP_ID]		= { .type = NLA_U32 },
	[THERMAL_GENL_ATTR_TZ_TRIP_TEMP]	= { .type = NLA_U32 },
	[THERMAL_GENL_ATTR_TZ_TRIP_TYPE]	= { .type = NLA_U32 },
	[THERMAL_GENL_ATTR_TZ_TRIP_HYST]	= { .type = NLA_U32 },
	[THERMAL_GENL_ATTR_TZ_MODE]		= { .type = NLA_U32 },
	[THERMAL_GENL_ATTR_TZ_CDEV_WEIGHT]	= { .type = NLA_U32 },
	[THERMAL_GENL_ATTR_TZ_NAME]		= { .type = NLA_STRING,
						    .len = THERMAL_NAME_LENGTH },
	/* Governor(s) */
	[THERMAL_GENL_ATTR_TZ_GOV]		= { .type = NLA_NESTED },
	[THERMAL_GENL_ATTR_TZ_GOV_NAME]		= { .type = NLA_STRING,
						    .len = THERMAL_NAME_LENGTH },
	/* Cooling devices */
	[THERMAL_GENL_ATTR_CDEV]		= { .type = NLA_NESTED },
	[THERMAL_GENL_ATTR_CDEV_ID]		= { .type = NLA_U32 },
	[THERMAL_GENL_ATTR_CDEV_CUR_STATE]	= { .type = NLA_U32 },
	[THERMAL_GENL_ATTR_CDEV_MAX_STATE]	= { .type = NLA_U32 },
	[THERMAL_GENL_ATTR_CDEV_NAME]		= { .type = NLA_STRING,
						    .len = THERMAL_NAME_LENGTH },
	/* CPU capabilities */
	[THERMAL_GENL_ATTR_CPU_CAPABILITY]		= { .type = NLA_NESTED },
	[THERMAL_GENL_ATTR_CPU_CAPABILITY_ID]		= { .type = NLA_U32 },
	[THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE]	= { .type = NLA_U32 },
	[THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY]	= { .type = NLA_U32 },
};

struct param {
	struct nlattr **attrs;
	struct sk_buff *msg;
	const char *name;
	int tz_id;
	int cdev_id;
	int trip_id;
	int trip_temp;
	int trip_type;
	int trip_hyst;
	int temp;
	int cdev_state;
	int cdev_max_state;
	struct thermal_genl_cpu_caps *cpu_capabilities;
	int cpu_capabilities_count;
};

typedef int (*cb_t)(struct param *);

static struct genl_family thermal_gnl_family;

static int thermal_group_has_listeners(enum thermal_genl_multicast_groups group)
{
	return genl_has_listeners(&thermal_gnl_family, &init_net, group);
}

/************************** Sampling encoding *******************************/

int thermal_genl_sampling_temp(int id, int temp)
{
	struct sk_buff *skb;
	void *hdr;

	if (!thermal_group_has_listeners(THERMAL_GENL_SAMPLING_GROUP))
		return 0;

	skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	hdr = genlmsg_put(skb, 0, 0, &thermal_gnl_family, 0,
			  THERMAL_GENL_SAMPLING_TEMP);
	if (!hdr)
		goto out_free;

	if (nla_put_u32(skb, THERMAL_GENL_ATTR_TZ_ID, id))
		goto out_cancel;

	if (nla_put_u32(skb, THERMAL_GENL_ATTR_TZ_TEMP, temp))
		goto out_cancel;

	genlmsg_end(skb, hdr);

	genlmsg_multicast(&thermal_gnl_family, skb, 0, THERMAL_GENL_SAMPLING_GROUP, GFP_KERNEL);

	return 0;
out_cancel:
	genlmsg_cancel(skb, hdr);
out_free:
	nlmsg_free(skb);

	return -EMSGSIZE;
}

/**************************** Event encoding *********************************/

static int thermal_genl_event_tz_create(struct param *p)
{
	if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id) ||
	    nla_put_string(p->msg, THERMAL_GENL_ATTR_TZ_NAME, p->name))
		return -EMSGSIZE;

	return 0;
}

static int thermal_genl_event_tz(struct param *p)
{
	if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id))
		return -EMSGSIZE;

	return 0;
}

static int thermal_genl_event_tz_trip_up(struct param *p)
{
	if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id) ||
	    nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TRIP_ID, p->trip_id) ||
	    nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TEMP, p->temp))
		return -EMSGSIZE;

	return 0;
}

static int thermal_genl_event_tz_trip_add(struct param *p)
{
	if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id) ||
	    nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TRIP_ID, p->trip_id) ||
	    nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TRIP_TYPE, p->trip_type) ||
	    nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TRIP_TEMP, p->trip_temp) ||
	    nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TRIP_HYST, p->trip_hyst))
		return -EMSGSIZE;

	return 0;
}

static int thermal_genl_event_tz_trip_delete(struct param *p)
{
	if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id) ||
	    nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_TRIP_ID, p->trip_id))
		return -EMSGSIZE;

	return 0;
}

static int thermal_genl_event_cdev_add(struct param *p)
{
	if (nla_put_string(p->msg, THERMAL_GENL_ATTR_CDEV_NAME,
			   p->name) ||
	    nla_put_u32(p->msg, THERMAL_GENL_ATTR_CDEV_ID,
			p->cdev_id) ||
	    nla_put_u32(p->msg, THERMAL_GENL_ATTR_CDEV_MAX_STATE,
			p->cdev_max_state))
		return -EMSGSIZE;

	return 0;
}

static int thermal_genl_event_cdev_delete(struct param *p)
{
	if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_CDEV_ID, p->cdev_id))
		return -EMSGSIZE;

	return 0;
}

static int thermal_genl_event_cdev_state_update(struct param *p)
{
	if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_CDEV_ID,
			p->cdev_id) ||
	    nla_put_u32(p->msg, THERMAL_GENL_ATTR_CDEV_CUR_STATE,
			p->cdev_state))
		return -EMSGSIZE;

	return 0;
}

static int thermal_genl_event_gov_change(struct param *p)
{
	if (nla_put_u32(p->msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id) ||
	    nla_put_string(p->msg, THERMAL_GENL_ATTR_GOV_NAME, p->name))
		return -EMSGSIZE;

	return 0;
}

static int thermal_genl_event_cpu_capability_change(struct param *p)
{
	struct thermal_genl_cpu_caps *cpu_cap = p->cpu_capabilities;
	struct sk_buff *msg = p->msg;
	struct nlattr *start_cap;
	int i;

	start_cap = nla_nest_start(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY);
	if (!start_cap)
		return -EMSGSIZE;

	for (i = 0; i < p->cpu_capabilities_count; ++i) {
		if (nla_put_u32(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY_ID,
				cpu_cap->cpu))
			goto out_cancel_nest;

		if (nla_put_u32(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE,
				cpu_cap->performance))
			goto out_cancel_nest;

		if (nla_put_u32(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY,
				cpu_cap->efficiency))
			goto out_cancel_nest;

		++cpu_cap;
	}

	nla_nest_end(msg, start_cap);

	return 0;
out_cancel_nest:
	nla_nest_cancel(msg, start_cap);

	return -EMSGSIZE;
}

int thermal_genl_event_tz_delete(struct param *p)
	__attribute__((alias("thermal_genl_event_tz")));

int thermal_genl_event_tz_enable(struct param *p)
	__attribute__((alias("thermal_genl_event_tz")));

int thermal_genl_event_tz_disable(struct param *p)
	__attribute__((alias("thermal_genl_event_tz")));

int thermal_genl_event_tz_trip_down(struct param *p)
	__attribute__((alias("thermal_genl_event_tz_trip_up")));

int thermal_genl_event_tz_trip_change(struct param *p)
	__attribute__((alias("thermal_genl_event_tz_trip_add")));

static cb_t event_cb[] = {
	[THERMAL_GENL_EVENT_TZ_CREATE]		= thermal_genl_event_tz_create,
	[THERMAL_GENL_EVENT_TZ_DELETE]		= thermal_genl_event_tz_delete,
	[THERMAL_GENL_EVENT_TZ_ENABLE]		= thermal_genl_event_tz_enable,
	[THERMAL_GENL_EVENT_TZ_DISABLE]		= thermal_genl_event_tz_disable,
	[THERMAL_GENL_EVENT_TZ_TRIP_UP]		= thermal_genl_event_tz_trip_up,
	[THERMAL_GENL_EVENT_TZ_TRIP_DOWN]	= thermal_genl_event_tz_trip_down,
	[THERMAL_GENL_EVENT_TZ_TRIP_CHANGE]	= thermal_genl_event_tz_trip_change,
	[THERMAL_GENL_EVENT_TZ_TRIP_ADD]	= thermal_genl_event_tz_trip_add,
	[THERMAL_GENL_EVENT_TZ_TRIP_DELETE]	= thermal_genl_event_tz_trip_delete,
	[THERMAL_GENL_EVENT_CDEV_ADD]		= thermal_genl_event_cdev_add,
	[THERMAL_GENL_EVENT_CDEV_DELETE]	= thermal_genl_event_cdev_delete,
	[THERMAL_GENL_EVENT_CDEV_STATE_UPDATE]	= thermal_genl_event_cdev_state_update,
	[THERMAL_GENL_EVENT_TZ_GOV_CHANGE]	= thermal_genl_event_gov_change,
	[THERMAL_GENL_EVENT_CPU_CAPABILITY_CHANGE] = thermal_genl_event_cpu_capability_change,
};

/*
 * Generic netlink event encoding
 */
static int thermal_genl_send_event(enum thermal_genl_event event,
				   struct param *p)
{
	struct sk_buff *msg;
	int ret = -EMSGSIZE;
	void *hdr;

	if (!thermal_group_has_listeners(THERMAL_GENL_EVENT_GROUP))
		return 0;

	msg = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!msg)
		return -ENOMEM;
	p->msg = msg;

	hdr = genlmsg_put(msg, 0, 0, &thermal_gnl_family, 0, event);
	if (!hdr)
		goto out_free_msg;

	ret = event_cb[event](p);
	if (ret)
		goto out_cancel_msg;

	genlmsg_end(msg, hdr);

	genlmsg_multicast(&thermal_gnl_family, msg, 0, THERMAL_GENL_EVENT_GROUP, GFP_KERNEL);

	return 0;

out_cancel_msg:
	genlmsg_cancel(msg, hdr);
out_free_msg:
	nlmsg_free(msg);

	return ret;
}

int thermal_notify_tz_create(int tz_id, const char *name)
{
	struct param p = { .tz_id = tz_id, .name = name };

	return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_CREATE, &p);
}

int thermal_notify_tz_delete(int tz_id)
{
	struct param p = { .tz_id = tz_id };

	return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_DELETE, &p);
}

int thermal_notify_tz_enable(int tz_id)
{
	struct param p = { .tz_id = tz_id };

	return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_ENABLE, &p);
}

int thermal_notify_tz_disable(int tz_id)
{
	struct param p = { .tz_id = tz_id };

	return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_DISABLE, &p);
}

int thermal_notify_tz_trip_down(int tz_id, int trip_id, int temp)
{
	struct param p = { .tz_id = tz_id, .trip_id = trip_id, .temp = temp };

	return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_TRIP_DOWN, &p);
}

int thermal_notify_tz_trip_up(int tz_id, int trip_id, int temp)
{
	struct param p = { .tz_id = tz_id, .trip_id = trip_id, .temp = temp };

	return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_TRIP_UP, &p);
}

int thermal_notify_tz_trip_add(int tz_id, int trip_id, int trip_type,
			       int trip_temp, int trip_hyst)
{
	struct param p = { .tz_id = tz_id, .trip_id = trip_id,
			   .trip_type = trip_type, .trip_temp = trip_temp,
			   .trip_hyst = trip_hyst };

	return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_TRIP_ADD, &p);
}

int thermal_notify_tz_trip_delete(int tz_id, int trip_id)
{
	struct param p = { .tz_id = tz_id, .trip_id = trip_id };

	return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_TRIP_DELETE, &p);
}

int thermal_notify_tz_trip_change(int tz_id, int trip_id, int trip_type,
				  int trip_temp, int trip_hyst)
{
	struct param p = { .tz_id = tz_id, .trip_id = trip_id,
			   .trip_type = trip_type, .trip_temp = trip_temp,
			   .trip_hyst = trip_hyst };

	return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_TRIP_CHANGE, &p);
}

int thermal_notify_cdev_state_update(int cdev_id, int cdev_state)
{
	struct param p = { .cdev_id = cdev_id, .cdev_state = cdev_state };

	return thermal_genl_send_event(THERMAL_GENL_EVENT_CDEV_STATE_UPDATE, &p);
}

int thermal_notify_cdev_add(int cdev_id, const char *name, int cdev_max_state)
{
	struct param p = { .cdev_id = cdev_id, .name = name,
			   .cdev_max_state = cdev_max_state };

	return thermal_genl_send_event(THERMAL_GENL_EVENT_CDEV_ADD, &p);
}

int thermal_notify_cdev_delete(int cdev_id)
{
	struct param p = { .cdev_id = cdev_id };

	return thermal_genl_send_event(THERMAL_GENL_EVENT_CDEV_DELETE, &p);
}

int thermal_notify_tz_gov_change(int tz_id, const char *name)
{
	struct param p = { .tz_id = tz_id, .name = name };

	return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_GOV_CHANGE, &p);
}

int thermal_genl_cpu_capability_event(int count,
				      struct thermal_genl_cpu_caps *caps)
{
	struct param p = { .cpu_capabilities_count = count, .cpu_capabilities = caps };

	return thermal_genl_send_event(THERMAL_GENL_EVENT_CPU_CAPABILITY_CHANGE, &p);
}
EXPORT_SYMBOL_GPL(thermal_genl_cpu_capability_event);

/*************************** Command encoding ********************************/

static int __thermal_genl_cmd_tz_get_id(struct thermal_zone_device *tz,
					void *data)
{
	struct sk_buff *msg = data;

	if (nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_ID, tz->id) ||
	    nla_put_string(msg, THERMAL_GENL_ATTR_TZ_NAME, tz->type))
		return -EMSGSIZE;

	return 0;
}

static int thermal_genl_cmd_tz_get_id(struct param *p)
{
	struct sk_buff *msg = p->msg;
	struct nlattr *start_tz;
	int ret;

	start_tz = nla_nest_start(msg, THERMAL_GENL_ATTR_TZ);
	if (!start_tz)
		return -EMSGSIZE;

	ret = for_each_thermal_zone(__thermal_genl_cmd_tz_get_id, msg);
	if (ret)
		goto out_cancel_nest;

	nla_nest_end(msg, start_tz);

	return 0;

out_cancel_nest:
	nla_nest_cancel(msg, start_tz);

	return ret;
}

static int thermal_genl_cmd_tz_get_trip(struct param *p)
{
	struct sk_buff *msg = p->msg;
	const struct thermal_trip *trip;
	struct thermal_zone_device *tz;
	struct nlattr *start_trip;
	int id;

	if (!p->attrs[THERMAL_GENL_ATTR_TZ_ID])
		return -EINVAL;

	id = nla_get_u32(p->attrs[THERMAL_GENL_ATTR_TZ_ID]);

	tz = thermal_zone_get_by_id(id);
	if (!tz)
		return -EINVAL;

	start_trip = nla_nest_start(msg, THERMAL_GENL_ATTR_TZ_TRIP);
	if (!start_trip)
		return -EMSGSIZE;

	mutex_lock(&tz->lock);

	for_each_trip(tz, trip) {
		if (nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_ID,
				thermal_zone_trip_id(tz, trip)) ||
		    nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_TYPE, trip->type) ||
		    nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_TEMP, trip->temperature) ||
		    nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TRIP_HYST, trip->hysteresis))
			goto out_cancel_nest;
	}

	mutex_unlock(&tz->lock);

	nla_nest_end(msg, start_trip);

	return 0;

out_cancel_nest:
	mutex_unlock(&tz->lock);

	return -EMSGSIZE;
}

static int thermal_genl_cmd_tz_get_temp(struct param *p)
{
	struct sk_buff *msg = p->msg;
	struct thermal_zone_device *tz;
	int temp, ret, id;

	if (!p->attrs[THERMAL_GENL_ATTR_TZ_ID])
		return -EINVAL;

	id = nla_get_u32(p->attrs[THERMAL_GENL_ATTR_TZ_ID]);

	tz = thermal_zone_get_by_id(id);
	if (!tz)
		return -EINVAL;

	ret = thermal_zone_get_temp(tz, &temp);
	if (ret)
		return ret;

	if (nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_ID, id) ||
	    nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_TEMP, temp))
		return -EMSGSIZE;

	return 0;
}

static int thermal_genl_cmd_tz_get_gov(struct param *p)
{
	struct sk_buff *msg = p->msg;
	struct thermal_zone_device *tz;
	int id, ret = 0;

	if (!p->attrs[THERMAL_GENL_ATTR_TZ_ID])
		return -EINVAL;

	id = nla_get_u32(p->attrs[THERMAL_GENL_ATTR_TZ_ID]);

	tz = thermal_zone_get_by_id(id);
	if (!tz)
		return -EINVAL;

	mutex_lock(&tz->lock);

	if (nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_ID, id) ||
	    nla_put_string(msg, THERMAL_GENL_ATTR_TZ_GOV_NAME,
			   tz->governor->name))
		ret = -EMSGSIZE;

	mutex_unlock(&tz->lock);

	return ret;
}

static int __thermal_genl_cmd_cdev_get(struct thermal_cooling_device *cdev,
				       void *data)
{
	struct sk_buff *msg = data;

	if (nla_put_u32(msg, THERMAL_GENL_ATTR_CDEV_ID, cdev->id))
		return -EMSGSIZE;

	if (nla_put_string(msg, THERMAL_GENL_ATTR_CDEV_NAME, cdev->type))
		return -EMSGSIZE;

	return 0;
}

static int thermal_genl_cmd_cdev_get(struct param *p)
{
	struct sk_buff *msg = p->msg;
	struct nlattr *start_cdev;
	int ret;

	start_cdev = nla_nest_start(msg, THERMAL_GENL_ATTR_CDEV);
	if (!start_cdev)
		return -EMSGSIZE;

	ret = for_each_thermal_cooling_device(__thermal_genl_cmd_cdev_get, msg);
	if (ret)
		goto out_cancel_nest;

	nla_nest_end(msg, start_cdev);

	return 0;
out_cancel_nest:
	nla_nest_cancel(msg, start_cdev);

	return ret;
}

static cb_t cmd_cb[] = {
	[THERMAL_GENL_CMD_TZ_GET_ID]	= thermal_genl_cmd_tz_get_id,
	[THERMAL_GENL_CMD_TZ_GET_TRIP]	= thermal_genl_cmd_tz_get_trip,
	[THERMAL_GENL_CMD_TZ_GET_TEMP]	= thermal_genl_cmd_tz_get_temp,
	[THERMAL_GENL_CMD_TZ_GET_GOV]	= thermal_genl_cmd_tz_get_gov,
	[THERMAL_GENL_CMD_CDEV_GET]	= thermal_genl_cmd_cdev_get,
};

static int thermal_genl_cmd_dumpit(struct sk_buff *skb,
				   struct netlink_callback *cb)
{
	struct param p = { .msg = skb };
	const struct genl_dumpit_info *info = genl_dumpit_info(cb);
	int cmd = info->op.cmd;
	int ret;
	void *hdr;

	hdr = genlmsg_put(skb, 0, 0, &thermal_gnl_family, 0, cmd);
	if (!hdr)
		return -EMSGSIZE;

	ret = cmd_cb[cmd](&p);
	if (ret)
		goto out_cancel_msg;

	genlmsg_end(skb, hdr);

	return 0;

out_cancel_msg:
	genlmsg_cancel(skb, hdr);

	return ret;
}

static int thermal_genl_cmd_doit(struct sk_buff *skb,
				 struct genl_info *info)
{
	struct param p = { .attrs = info->attrs };
	struct sk_buff *msg;
	void *hdr;
	int cmd = info->genlhdr->cmd;
	int ret = -EMSGSIZE;

	msg = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!msg)
		return -ENOMEM;
	p.msg = msg;

	hdr = genlmsg_put_reply(msg, info, &thermal_gnl_family, 0, cmd);
	if (!hdr)
		goto out_free_msg;

	ret = cmd_cb[cmd](&p);
	if (ret)
		goto out_cancel_msg;

	genlmsg_end(msg, hdr);

	return genlmsg_reply(msg, info);

out_cancel_msg:
	genlmsg_cancel(msg, hdr);
out_free_msg:
	nlmsg_free(msg);

	return ret;
}

static const struct genl_small_ops thermal_genl_ops[] = {
	{
		.cmd = THERMAL_GENL_CMD_TZ_GET_ID,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.dumpit = thermal_genl_cmd_dumpit,
	},
	{
		.cmd = THERMAL_GENL_CMD_TZ_GET_TRIP,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.doit = thermal_genl_cmd_doit,
	},
	{
		.cmd = THERMAL_GENL_CMD_TZ_GET_TEMP,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.doit = thermal_genl_cmd_doit,
	},
	{
		.cmd = THERMAL_GENL_CMD_TZ_GET_GOV,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.doit = thermal_genl_cmd_doit,
	},
	{
		.cmd = THERMAL_GENL_CMD_CDEV_GET,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.dumpit = thermal_genl_cmd_dumpit,
	},
};

static struct genl_family thermal_gnl_family __ro_after_init = {
	.hdrsize	= 0,
	.name		= THERMAL_GENL_FAMILY_NAME,
	.version	= THERMAL_GENL_VERSION,
	.maxattr	= THERMAL_GENL_ATTR_MAX,
	.policy		= thermal_genl_policy,
	.small_ops	= thermal_genl_ops,
	.n_small_ops	= ARRAY_SIZE(thermal_genl_ops),
	.resv_start_op	= THERMAL_GENL_CMD_CDEV_GET + 1,
	.mcgrps		= thermal_genl_mcgrps,
	.n_mcgrps	= ARRAY_SIZE(thermal_genl_mcgrps),
};

int __init thermal_netlink_init(void)
{
	return genl_register_family(&thermal_gnl_family);
}

void __init thermal_netlink_exit(void)
{
	genl_unregister_family(&thermal_gnl_family);
}