summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/nouveau/nouveau_hwmon.c
blob: db30a4c2cd4d0783fe0a91b12cfb12b48fdf7a9f (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
719
720
721
722
723
724
725
/*
 * Copyright 2010 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */

#ifdef CONFIG_ACPI
#include <linux/acpi.h>
#endif
#include <linux/power_supply.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>

#include "nouveau_drv.h"
#include "nouveau_hwmon.h"

#include <nvkm/subdev/iccsense.h>
#include <nvkm/subdev/volt.h>

#if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))

static ssize_t
nouveau_hwmon_show_temp1_auto_point1_pwm(struct device *d,
					 struct device_attribute *a, char *buf)
{
	return sysfs_emit(buf, "%d\n", 100);
}
static SENSOR_DEVICE_ATTR(temp1_auto_point1_pwm, 0444,
			  nouveau_hwmon_show_temp1_auto_point1_pwm, NULL, 0);

static ssize_t
nouveau_hwmon_temp1_auto_point1_temp(struct device *d,
				     struct device_attribute *a, char *buf)
{
	struct drm_device *dev = dev_get_drvdata(d);
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);

	return sysfs_emit(buf, "%d\n",
			  therm->attr_get(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST) * 1000);
}
static ssize_t
nouveau_hwmon_set_temp1_auto_point1_temp(struct device *d,
					 struct device_attribute *a,
					 const char *buf, size_t count)
{
	struct drm_device *dev = dev_get_drvdata(d);
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
	long value;

	if (kstrtol(buf, 10, &value))
		return -EINVAL;

	therm->attr_set(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST,
			value / 1000);

	return count;
}
static SENSOR_DEVICE_ATTR(temp1_auto_point1_temp, 0644,
			  nouveau_hwmon_temp1_auto_point1_temp,
			  nouveau_hwmon_set_temp1_auto_point1_temp, 0);

static ssize_t
nouveau_hwmon_temp1_auto_point1_temp_hyst(struct device *d,
					  struct device_attribute *a, char *buf)
{
	struct drm_device *dev = dev_get_drvdata(d);
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);

	return sysfs_emit(buf, "%d\n",
			  therm->attr_get(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST_HYST) * 1000);
}
static ssize_t
nouveau_hwmon_set_temp1_auto_point1_temp_hyst(struct device *d,
					      struct device_attribute *a,
					      const char *buf, size_t count)
{
	struct drm_device *dev = dev_get_drvdata(d);
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
	long value;

	if (kstrtol(buf, 10, &value))
		return -EINVAL;

	therm->attr_set(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST_HYST,
			value / 1000);

	return count;
}
static SENSOR_DEVICE_ATTR(temp1_auto_point1_temp_hyst, 0644,
			  nouveau_hwmon_temp1_auto_point1_temp_hyst,
			  nouveau_hwmon_set_temp1_auto_point1_temp_hyst, 0);

static ssize_t
nouveau_hwmon_get_pwm1_max(struct device *d,
			   struct device_attribute *a, char *buf)
{
	struct drm_device *dev = dev_get_drvdata(d);
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
	int ret;

	ret = therm->attr_get(therm, NVKM_THERM_ATTR_FAN_MAX_DUTY);
	if (ret < 0)
		return ret;

	return sprintf(buf, "%i\n", ret);
}

static ssize_t
nouveau_hwmon_get_pwm1_min(struct device *d,
			   struct device_attribute *a, char *buf)
{
	struct drm_device *dev = dev_get_drvdata(d);
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
	int ret;

	ret = therm->attr_get(therm, NVKM_THERM_ATTR_FAN_MIN_DUTY);
	if (ret < 0)
		return ret;

	return sprintf(buf, "%i\n", ret);
}

static ssize_t
nouveau_hwmon_set_pwm1_min(struct device *d, struct device_attribute *a,
			   const char *buf, size_t count)
{
	struct drm_device *dev = dev_get_drvdata(d);
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
	long value;
	int ret;

	if (kstrtol(buf, 10, &value))
		return -EINVAL;

	ret = therm->attr_set(therm, NVKM_THERM_ATTR_FAN_MIN_DUTY, value);
	if (ret < 0)
		return ret;

	return count;
}
static SENSOR_DEVICE_ATTR(pwm1_min, 0644,
			  nouveau_hwmon_get_pwm1_min,
			  nouveau_hwmon_set_pwm1_min, 0);

static ssize_t
nouveau_hwmon_set_pwm1_max(struct device *d, struct device_attribute *a,
			   const char *buf, size_t count)
{
	struct drm_device *dev = dev_get_drvdata(d);
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
	long value;
	int ret;

	if (kstrtol(buf, 10, &value))
		return -EINVAL;

	ret = therm->attr_set(therm, NVKM_THERM_ATTR_FAN_MAX_DUTY, value);
	if (ret < 0)
		return ret;

	return count;
}
static SENSOR_DEVICE_ATTR(pwm1_max, 0644,
			  nouveau_hwmon_get_pwm1_max,
			  nouveau_hwmon_set_pwm1_max, 0);

static struct attribute *pwm_fan_sensor_attrs[] = {
	&sensor_dev_attr_pwm1_min.dev_attr.attr,
	&sensor_dev_attr_pwm1_max.dev_attr.attr,
	NULL
};
static const struct attribute_group pwm_fan_sensor_group = {
	.attrs = pwm_fan_sensor_attrs,
};

static struct attribute *temp1_auto_point_sensor_attrs[] = {
	&sensor_dev_attr_temp1_auto_point1_pwm.dev_attr.attr,
	&sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
	&sensor_dev_attr_temp1_auto_point1_temp_hyst.dev_attr.attr,
	NULL
};
static const struct attribute_group temp1_auto_point_sensor_group = {
	.attrs = temp1_auto_point_sensor_attrs,
};

#define N_ATTR_GROUPS   3

static const struct hwmon_channel_info * const nouveau_info[] = {
	HWMON_CHANNEL_INFO(chip,
			   HWMON_C_UPDATE_INTERVAL),
	HWMON_CHANNEL_INFO(temp,
			   HWMON_T_INPUT |
			   HWMON_T_MAX | HWMON_T_MAX_HYST |
			   HWMON_T_CRIT | HWMON_T_CRIT_HYST |
			   HWMON_T_EMERGENCY | HWMON_T_EMERGENCY_HYST),
	HWMON_CHANNEL_INFO(fan,
			   HWMON_F_INPUT),
	HWMON_CHANNEL_INFO(in,
			   HWMON_I_INPUT |
			   HWMON_I_MIN | HWMON_I_MAX |
			   HWMON_I_LABEL),
	HWMON_CHANNEL_INFO(pwm,
			   HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
	HWMON_CHANNEL_INFO(power,
			   HWMON_P_INPUT | HWMON_P_CAP_MAX | HWMON_P_CRIT),
	NULL
};

static umode_t
nouveau_chip_is_visible(const void *data, u32 attr, int channel)
{
	switch (attr) {
	case hwmon_chip_update_interval:
		return 0444;
	default:
		return 0;
	}
}

static umode_t
nouveau_power_is_visible(const void *data, u32 attr, int channel)
{
	struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
	struct nvkm_iccsense *iccsense = nvxx_iccsense(&drm->client.device);

	if (!iccsense || !iccsense->data_valid || list_empty(&iccsense->rails))
		return 0;

	switch (attr) {
	case hwmon_power_input:
		return 0444;
	case hwmon_power_max:
		if (iccsense->power_w_max)
			return 0444;
		return 0;
	case hwmon_power_crit:
		if (iccsense->power_w_crit)
			return 0444;
		return 0;
	default:
		return 0;
	}
}

static umode_t
nouveau_temp_is_visible(const void *data, u32 attr, int channel)
{
	struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);

	if (!therm || !therm->attr_get || nvkm_therm_temp_get(therm) < 0)
		return 0;

	switch (attr) {
	case hwmon_temp_input:
		return 0444;
	case hwmon_temp_max:
	case hwmon_temp_max_hyst:
	case hwmon_temp_crit:
	case hwmon_temp_crit_hyst:
	case hwmon_temp_emergency:
	case hwmon_temp_emergency_hyst:
		return 0644;
	default:
		return 0;
	}
}

static umode_t
nouveau_pwm_is_visible(const void *data, u32 attr, int channel)
{
	struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);

	if (!therm || !therm->attr_get || !therm->fan_get ||
	    therm->fan_get(therm) < 0)
		return 0;

	switch (attr) {
	case hwmon_pwm_enable:
	case hwmon_pwm_input:
		return 0644;
	default:
		return 0;
	}
}

static umode_t
nouveau_input_is_visible(const void *data, u32 attr, int channel)
{
	struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
	struct nvkm_volt *volt = nvxx_volt(&drm->client.device);

	if (!volt || nvkm_volt_get(volt) < 0)
		return 0;

	switch (attr) {
	case hwmon_in_input:
	case hwmon_in_label:
	case hwmon_in_min:
	case hwmon_in_max:
		return 0444;
	default:
		return 0;
	}
}

static umode_t
nouveau_fan_is_visible(const void *data, u32 attr, int channel)
{
	struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);

	if (!therm || !therm->attr_get || nvkm_therm_fan_sense(therm) < 0)
		return 0;

	switch (attr) {
	case hwmon_fan_input:
		return 0444;
	default:
		return 0;
	}
}

static int
nouveau_chip_read(struct device *dev, u32 attr, int channel, long *val)
{
	switch (attr) {
	case hwmon_chip_update_interval:
		*val = 1000;
		break;
	default:
		return -EOPNOTSUPP;
	}

	return 0;
}

static int
nouveau_temp_read(struct device *dev, u32 attr, int channel, long *val)
{
	struct drm_device *drm_dev = dev_get_drvdata(dev);
	struct nouveau_drm *drm = nouveau_drm(drm_dev);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
	int ret;

	if (!therm || !therm->attr_get)
		return -EOPNOTSUPP;

	switch (attr) {
	case hwmon_temp_input:
		if (drm_dev->switch_power_state != DRM_SWITCH_POWER_ON)
			return -EINVAL;
		ret = nvkm_therm_temp_get(therm);
		*val = ret < 0 ? ret : (ret * 1000);
		break;
	case hwmon_temp_max:
		*val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_DOWN_CLK)
					* 1000;
		break;
	case hwmon_temp_max_hyst:
		*val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_DOWN_CLK_HYST)
					* 1000;
		break;
	case hwmon_temp_crit:
		*val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_CRITICAL)
					* 1000;
		break;
	case hwmon_temp_crit_hyst:
		*val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_CRITICAL_HYST)
					* 1000;
		break;
	case hwmon_temp_emergency:
		*val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_SHUTDOWN)
					* 1000;
		break;
	case hwmon_temp_emergency_hyst:
		*val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_SHUTDOWN_HYST)
					* 1000;
		break;
	default:
		return -EOPNOTSUPP;
	}

	return 0;
}

static int
nouveau_fan_read(struct device *dev, u32 attr, int channel, long *val)
{
	struct drm_device *drm_dev = dev_get_drvdata(dev);
	struct nouveau_drm *drm = nouveau_drm(drm_dev);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);

	if (!therm)
		return -EOPNOTSUPP;

	switch (attr) {
	case hwmon_fan_input:
		if (drm_dev->switch_power_state != DRM_SWITCH_POWER_ON)
			return -EINVAL;
		*val = nvkm_therm_fan_sense(therm);
		break;
	default:
		return -EOPNOTSUPP;
	}

	return 0;
}

static int
nouveau_in_read(struct device *dev, u32 attr, int channel, long *val)
{
	struct drm_device *drm_dev = dev_get_drvdata(dev);
	struct nouveau_drm *drm = nouveau_drm(drm_dev);
	struct nvkm_volt *volt = nvxx_volt(&drm->client.device);
	int ret;

	if (!volt)
		return -EOPNOTSUPP;

	switch (attr) {
	case hwmon_in_input:
		if (drm_dev->switch_power_state != DRM_SWITCH_POWER_ON)
			return -EINVAL;
		ret = nvkm_volt_get(volt);
		*val = ret < 0 ? ret : (ret / 1000);
		break;
	case hwmon_in_min:
		*val = volt->min_uv > 0 ? (volt->min_uv / 1000) : -ENODEV;
		break;
	case hwmon_in_max:
		*val = volt->max_uv > 0 ? (volt->max_uv / 1000) : -ENODEV;
		break;
	default:
		return -EOPNOTSUPP;
	}

	return 0;
}

static int
nouveau_pwm_read(struct device *dev, u32 attr, int channel, long *val)
{
	struct drm_device *drm_dev = dev_get_drvdata(dev);
	struct nouveau_drm *drm = nouveau_drm(drm_dev);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);

	if (!therm || !therm->attr_get || !therm->fan_get)
		return -EOPNOTSUPP;

	switch (attr) {
	case hwmon_pwm_enable:
		*val = therm->attr_get(therm, NVKM_THERM_ATTR_FAN_MODE);
		break;
	case hwmon_pwm_input:
		if (drm_dev->switch_power_state != DRM_SWITCH_POWER_ON)
			return -EINVAL;
		*val = therm->fan_get(therm);
		break;
	default:
		return -EOPNOTSUPP;
	}

	return 0;
}

static int
nouveau_power_read(struct device *dev, u32 attr, int channel, long *val)
{
	struct drm_device *drm_dev = dev_get_drvdata(dev);
	struct nouveau_drm *drm = nouveau_drm(drm_dev);
	struct nvkm_iccsense *iccsense = nvxx_iccsense(&drm->client.device);

	if (!iccsense)
		return -EOPNOTSUPP;

	switch (attr) {
	case hwmon_power_input:
		if (drm_dev->switch_power_state != DRM_SWITCH_POWER_ON)
			return -EINVAL;
		*val = nvkm_iccsense_read_all(iccsense);
		break;
	case hwmon_power_max:
		*val = iccsense->power_w_max;
		break;
	case hwmon_power_crit:
		*val = iccsense->power_w_crit;
		break;
	default:
		return -EOPNOTSUPP;
	}

	return 0;
}

static int
nouveau_temp_write(struct device *dev, u32 attr, int channel, long val)
{
	struct drm_device *drm_dev = dev_get_drvdata(dev);
	struct nouveau_drm *drm = nouveau_drm(drm_dev);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);

	if (!therm || !therm->attr_set)
		return -EOPNOTSUPP;

	switch (attr) {
	case hwmon_temp_max:
		return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_DOWN_CLK,
					val / 1000);
	case hwmon_temp_max_hyst:
		return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_DOWN_CLK_HYST,
					val / 1000);
	case hwmon_temp_crit:
		return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_CRITICAL,
					val / 1000);
	case hwmon_temp_crit_hyst:
		return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_CRITICAL_HYST,
					val / 1000);
	case hwmon_temp_emergency:
		return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_SHUTDOWN,
					val / 1000);
	case hwmon_temp_emergency_hyst:
		return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_SHUTDOWN_HYST,
					val / 1000);
	default:
		return -EOPNOTSUPP;
	}
}

static int
nouveau_pwm_write(struct device *dev, u32 attr, int channel, long val)
{
	struct drm_device *drm_dev = dev_get_drvdata(dev);
	struct nouveau_drm *drm = nouveau_drm(drm_dev);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);

	if (!therm || !therm->attr_set)
		return -EOPNOTSUPP;

	switch (attr) {
	case hwmon_pwm_input:
		return therm->fan_set(therm, val);
	case hwmon_pwm_enable:
		return therm->attr_set(therm, NVKM_THERM_ATTR_FAN_MODE, val);
	default:
		return -EOPNOTSUPP;
	}
}

static umode_t
nouveau_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr,
			int channel)
{
	switch (type) {
	case hwmon_chip:
		return nouveau_chip_is_visible(data, attr, channel);
	case hwmon_temp:
		return nouveau_temp_is_visible(data, attr, channel);
	case hwmon_fan:
		return nouveau_fan_is_visible(data, attr, channel);
	case hwmon_in:
		return nouveau_input_is_visible(data, attr, channel);
	case hwmon_pwm:
		return nouveau_pwm_is_visible(data, attr, channel);
	case hwmon_power:
		return nouveau_power_is_visible(data, attr, channel);
	default:
		return 0;
	}
}

static const char input_label[] = "GPU core";

static int
nouveau_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr,
		    int channel, const char **buf)
{
	if (type == hwmon_in && attr == hwmon_in_label) {
		*buf = input_label;
		return 0;
	}

	return -EOPNOTSUPP;
}

static int
nouveau_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
							int channel, long *val)
{
	switch (type) {
	case hwmon_chip:
		return nouveau_chip_read(dev, attr, channel, val);
	case hwmon_temp:
		return nouveau_temp_read(dev, attr, channel, val);
	case hwmon_fan:
		return nouveau_fan_read(dev, attr, channel, val);
	case hwmon_in:
		return nouveau_in_read(dev, attr, channel, val);
	case hwmon_pwm:
		return nouveau_pwm_read(dev, attr, channel, val);
	case hwmon_power:
		return nouveau_power_read(dev, attr, channel, val);
	default:
		return -EOPNOTSUPP;
	}
}

static int
nouveau_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
							int channel, long val)
{
	switch (type) {
	case hwmon_temp:
		return nouveau_temp_write(dev, attr, channel, val);
	case hwmon_pwm:
		return nouveau_pwm_write(dev, attr, channel, val);
	default:
		return -EOPNOTSUPP;
	}
}

static const struct hwmon_ops nouveau_hwmon_ops = {
	.is_visible = nouveau_is_visible,
	.read = nouveau_read,
	.read_string = nouveau_read_string,
	.write = nouveau_write,
};

static const struct hwmon_chip_info nouveau_chip_info = {
	.ops = &nouveau_hwmon_ops,
	.info = nouveau_info,
};
#endif

int
nouveau_hwmon_init(struct drm_device *dev)
{
#if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct nvkm_iccsense *iccsense = nvxx_iccsense(&drm->client.device);
	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
	struct nvkm_volt *volt = nvxx_volt(&drm->client.device);
	const struct attribute_group *special_groups[N_ATTR_GROUPS];
	struct nouveau_hwmon *hwmon;
	struct device *hwmon_dev;
	int ret = 0;
	int i = 0;

	if (!iccsense && !therm && !volt) {
		NV_DEBUG(drm, "Skipping hwmon registration\n");
		return 0;
	}

	hwmon = drm->hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL);
	if (!hwmon)
		return -ENOMEM;
	hwmon->dev = dev;

	if (therm && therm->attr_get && therm->attr_set) {
		if (nvkm_therm_temp_get(therm) >= 0)
			special_groups[i++] = &temp1_auto_point_sensor_group;
		if (therm->fan_get && therm->fan_get(therm) >= 0)
			special_groups[i++] = &pwm_fan_sensor_group;
	}

	special_groups[i] = NULL;
	hwmon_dev = hwmon_device_register_with_info(dev->dev, "nouveau", dev,
							&nouveau_chip_info,
							special_groups);
	if (IS_ERR(hwmon_dev)) {
		ret = PTR_ERR(hwmon_dev);
		NV_ERROR(drm, "Unable to register hwmon device: %d\n", ret);
		return ret;
	}

	hwmon->hwmon = hwmon_dev;
	return 0;
#else
	return 0;
#endif
}

void
nouveau_hwmon_fini(struct drm_device *dev)
{
#if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
	struct nouveau_hwmon *hwmon = nouveau_hwmon(dev);

	if (!hwmon)
		return;

	if (hwmon->hwmon)
		hwmon_device_unregister(hwmon->hwmon);

	nouveau_drm(dev)->hwmon = NULL;
	kfree(hwmon);
#endif
}