summaryrefslogtreecommitdiff
path: root/drivers/hwmon/tmp401.c
blob: df1b45a62e804e8ed6d6e1dda32ffa8924327898 (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
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
// SPDX-License-Identifier: GPL-2.0-or-later
/* tmp401.c
 *
 * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>
 * Preliminary tmp411 support by:
 * Gabriel Konat, Sander Leget, Wouter Willems
 * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>
 *
 * Cleanup and support for TMP431 and TMP432 by Guenter Roeck
 * Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
 */

/*
 * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
 *
 * Note this IC is in some aspect similar to the LM90, but it has quite a
 * few differences too, for example the local temp has a higher resolution
 * and thus has 16 bits registers for its value and limit instead of 8 bits.
 */

#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/regmap.h>
#include <linux/slab.h>

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d,
	0x4e, 0x4f, I2C_CLIENT_END };

enum chips { tmp401, tmp411, tmp431, tmp432, tmp435 };

/*
 * The TMP401 registers, note some registers have different addresses for
 * reading and writing
 */
#define TMP401_STATUS				0x02
#define TMP401_CONFIG				0x03
#define TMP401_CONVERSION_RATE			0x04
#define TMP4XX_N_FACTOR_REG			0x18
#define TMP43X_BETA_RANGE			0x25
#define TMP401_TEMP_CRIT_HYST			0x21
#define TMP401_MANUFACTURER_ID_REG		0xFE
#define TMP401_DEVICE_ID_REG			0xFF

static const u8 TMP401_TEMP_MSB[7][3] = {
	{ 0x00, 0x01, 0x23 },	/* temp */
	{ 0x06, 0x08, 0x16 },	/* low limit */
	{ 0x05, 0x07, 0x15 },	/* high limit */
	{ 0x20, 0x19, 0x1a },	/* therm (crit) limit */
	{ 0x30, 0x34, 0x00 },	/* lowest */
	{ 0x32, 0xf6, 0x00 },	/* highest */
};

/* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
static const u8 TMP432_STATUS_REG[] = {
	0x1b, 0x36, 0x35, 0x37 };

/* Flags */
#define TMP401_CONFIG_RANGE			BIT(2)
#define TMP401_CONFIG_SHUTDOWN			BIT(6)
#define TMP401_STATUS_LOCAL_CRIT		BIT(0)
#define TMP401_STATUS_REMOTE_CRIT		BIT(1)
#define TMP401_STATUS_REMOTE_OPEN		BIT(2)
#define TMP401_STATUS_REMOTE_LOW		BIT(3)
#define TMP401_STATUS_REMOTE_HIGH		BIT(4)
#define TMP401_STATUS_LOCAL_LOW			BIT(5)
#define TMP401_STATUS_LOCAL_HIGH		BIT(6)

/* On TMP432, each status has its own register */
#define TMP432_STATUS_LOCAL			BIT(0)
#define TMP432_STATUS_REMOTE1			BIT(1)
#define TMP432_STATUS_REMOTE2			BIT(2)

/* Manufacturer / Device ID's */
#define TMP401_MANUFACTURER_ID			0x55
#define TMP401_DEVICE_ID			0x11
#define TMP411A_DEVICE_ID			0x12
#define TMP411B_DEVICE_ID			0x13
#define TMP411C_DEVICE_ID			0x10
#define TMP431_DEVICE_ID			0x31
#define TMP432_DEVICE_ID			0x32
#define TMP435_DEVICE_ID			0x35

/*
 * Driver data (common to all clients)
 */

static const struct i2c_device_id tmp401_id[] = {
	{ "tmp401", tmp401 },
	{ "tmp411", tmp411 },
	{ "tmp431", tmp431 },
	{ "tmp432", tmp432 },
	{ "tmp435", tmp435 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tmp401_id);

/*
 * Client data (each client gets its own)
 */

struct tmp401_data {
	struct i2c_client *client;
	struct regmap *regmap;
	struct mutex update_lock;
	enum chips kind;

	bool extended_range;

	/* hwmon API configuration data */
	u32 chip_channel_config[4];
	struct hwmon_channel_info chip_info;
	u32 temp_channel_config[4];
	struct hwmon_channel_info temp_info;
	const struct hwmon_channel_info *info[3];
	struct hwmon_chip_info chip;
};

/* regmap */

static bool tmp401_regmap_is_volatile(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case 0:			/* local temp msb */
	case 1:			/* remote temp msb */
	case 2:			/* status */
	case 0x10:		/* remote temp lsb */
	case 0x15:		/* local temp lsb */
	case 0x1b:		/* status (tmp432) */
	case 0x23 ... 0x24:	/* remote temp 2 msb / lsb */
	case 0x30 ... 0x37:	/* lowest/highest temp; status (tmp432) */
		return true;
	default:
		return false;
	}
}

static int tmp401_reg_read(void *context, unsigned int reg, unsigned int *val)
{
	struct tmp401_data *data = context;
	struct i2c_client *client = data->client;
	int regval;

	switch (reg) {
	case 0:			/* local temp msb */
	case 1:			/* remote temp msb */
	case 5:			/* local temp high limit msb */
	case 6:			/* local temp low limit msb */
	case 7:			/* remote temp ligh limit msb */
	case 8:			/* remote temp low limit msb */
	case 0x15:		/* remote temp 2 high limit msb */
	case 0x16:		/* remote temp 2 low limit msb */
	case 0x23:		/* remote temp 2 msb */
	case 0x30:		/* local temp minimum, tmp411 */
	case 0x32:		/* local temp maximum, tmp411 */
	case 0x34:		/* remote temp minimum, tmp411 */
	case 0xf6:		/* remote temp maximum, tmp411 (really 0x36) */
		/* work around register overlap between TMP411 and TMP432 */
		if (reg == 0xf6)
			reg = 0x36;
		regval = i2c_smbus_read_word_swapped(client, reg);
		if (regval < 0)
			return regval;
		*val = regval;
		break;
	case 0x19:		/* critical limits, 8-bit registers */
	case 0x1a:
	case 0x20:
		regval = i2c_smbus_read_byte_data(client, reg);
		if (regval < 0)
			return regval;
		*val = regval << 8;
		break;
	case 0x1b:
	case 0x35 ... 0x37:
		if (data->kind == tmp432) {
			regval = i2c_smbus_read_byte_data(client, reg);
			if (regval < 0)
				return regval;
			*val = regval;
			break;
		}
		/* simulate TMP432 status registers */
		regval = i2c_smbus_read_byte_data(client, TMP401_STATUS);
		if (regval < 0)
			return regval;
		*val = 0;
		switch (reg) {
		case 0x1b:	/* open / fault */
			if (regval & TMP401_STATUS_REMOTE_OPEN)
				*val |= BIT(1);
			break;
		case 0x35:	/* high limit */
			if (regval & TMP401_STATUS_LOCAL_HIGH)
				*val |= BIT(0);
			if (regval & TMP401_STATUS_REMOTE_HIGH)
				*val |= BIT(1);
			break;
		case 0x36:	/* low limit */
			if (regval & TMP401_STATUS_LOCAL_LOW)
				*val |= BIT(0);
			if (regval & TMP401_STATUS_REMOTE_LOW)
				*val |= BIT(1);
			break;
		case 0x37:	/* therm / crit limit */
			if (regval & TMP401_STATUS_LOCAL_CRIT)
				*val |= BIT(0);
			if (regval & TMP401_STATUS_REMOTE_CRIT)
				*val |= BIT(1);
			break;
		}
		break;
	default:
		regval = i2c_smbus_read_byte_data(client, reg);
		if (regval < 0)
			return regval;
		*val = regval;
		break;
	}
	return 0;
}

static int tmp401_reg_write(void *context, unsigned int reg, unsigned int val)
{
	struct tmp401_data *data = context;
	struct i2c_client *client = data->client;

	switch (reg) {
	case 0x05:		/* local temp high limit msb */
	case 0x06:		/* local temp low limit msb */
	case 0x07:		/* remote temp ligh limit msb */
	case 0x08:		/* remote temp low limit msb */
		reg += 6;	/* adjust for register write address */
		fallthrough;
	case 0x15:		/* remote temp 2 high limit msb */
	case 0x16:		/* remote temp 2 low limit msb */
		return i2c_smbus_write_word_swapped(client, reg, val);
	case 0x19:		/* critical limits, 8-bit registers */
	case 0x1a:
	case 0x20:
		return i2c_smbus_write_byte_data(client, reg, val >> 8);
	case TMP401_CONVERSION_RATE:
	case TMP401_CONFIG:
		reg += 6;	/* adjust for register write address */
		fallthrough;
	default:
		return i2c_smbus_write_byte_data(client, reg, val);
	}
}

static const struct regmap_config tmp401_regmap_config = {
	.reg_bits = 8,
	.val_bits = 16,
	.cache_type = REGCACHE_MAPLE,
	.volatile_reg = tmp401_regmap_is_volatile,
	.reg_read = tmp401_reg_read,
	.reg_write = tmp401_reg_write,
};

/* temperature conversion */

static int tmp401_register_to_temp(u16 reg, bool extended)
{
	int temp = reg;

	if (extended)
		temp -= 64 * 256;

	return DIV_ROUND_CLOSEST(temp * 125, 32);
}

static u16 tmp401_temp_to_register(long temp, bool extended, int zbits)
{
	if (extended) {
		temp = clamp_val(temp, -64000, 191000);
		temp += 64000;
	} else {
		temp = clamp_val(temp, 0, 127000);
	}

	return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
}

/* hwmon API functions */

static const u8 tmp401_temp_reg_index[] = {
	[hwmon_temp_input] = 0,
	[hwmon_temp_min] = 1,
	[hwmon_temp_max] = 2,
	[hwmon_temp_crit] = 3,
	[hwmon_temp_lowest] = 4,
	[hwmon_temp_highest] = 5,
};

static const u8 tmp401_status_reg_index[] = {
	[hwmon_temp_fault] = 0,
	[hwmon_temp_min_alarm] = 1,
	[hwmon_temp_max_alarm] = 2,
	[hwmon_temp_crit_alarm] = 3,
};

static int tmp401_temp_read(struct device *dev, u32 attr, int channel, long *val)
{
	struct tmp401_data *data = dev_get_drvdata(dev);
	struct regmap *regmap = data->regmap;
	unsigned int regval;
	int reg, ret;

	switch (attr) {
	case hwmon_temp_input:
	case hwmon_temp_min:
	case hwmon_temp_max:
	case hwmon_temp_crit:
	case hwmon_temp_lowest:
	case hwmon_temp_highest:
		reg = TMP401_TEMP_MSB[tmp401_temp_reg_index[attr]][channel];
		ret = regmap_read(regmap, reg, &regval);
		if (ret < 0)
			return ret;
		*val = tmp401_register_to_temp(regval, data->extended_range);
		break;
	case hwmon_temp_crit_hyst:
		mutex_lock(&data->update_lock);
		reg = TMP401_TEMP_MSB[3][channel];
		ret = regmap_read(regmap, reg, &regval);
		if (ret < 0)
			goto unlock;
		*val = tmp401_register_to_temp(regval, data->extended_range);
		ret = regmap_read(regmap, TMP401_TEMP_CRIT_HYST, &regval);
		if (ret < 0)
			goto unlock;
		*val -= regval * 1000;
unlock:
		mutex_unlock(&data->update_lock);
		if (ret < 0)
			return ret;
		break;
	case hwmon_temp_fault:
	case hwmon_temp_min_alarm:
	case hwmon_temp_max_alarm:
	case hwmon_temp_crit_alarm:
		reg = TMP432_STATUS_REG[tmp401_status_reg_index[attr]];
		ret = regmap_read(regmap, reg, &regval);
		if (ret < 0)
			return ret;
		*val = !!(regval & BIT(channel));
		break;
	default:
		return -EOPNOTSUPP;
	}
	return 0;
}

static int tmp401_temp_write(struct device *dev, u32 attr, int channel,
			     long val)
{
	struct tmp401_data *data = dev_get_drvdata(dev);
	struct regmap *regmap = data->regmap;
	unsigned int regval;
	int reg, ret, temp;

	mutex_lock(&data->update_lock);
	switch (attr) {
	case hwmon_temp_min:
	case hwmon_temp_max:
	case hwmon_temp_crit:
		reg = TMP401_TEMP_MSB[tmp401_temp_reg_index[attr]][channel];
		regval = tmp401_temp_to_register(val, data->extended_range,
						 attr == hwmon_temp_crit ? 8 : 4);
		ret = regmap_write(regmap, reg, regval);
		break;
	case hwmon_temp_crit_hyst:
		if (data->extended_range)
			val = clamp_val(val, -64000, 191000);
		else
			val = clamp_val(val, 0, 127000);

		reg = TMP401_TEMP_MSB[3][channel];
		ret = regmap_read(regmap, reg, &regval);
		if (ret < 0)
			break;
		temp = tmp401_register_to_temp(regval, data->extended_range);
		val = clamp_val(val, temp - 255000, temp);
		regval = ((temp - val) + 500) / 1000;
		ret = regmap_write(regmap, TMP401_TEMP_CRIT_HYST, regval);
		break;
	default:
		ret = -EOPNOTSUPP;
		break;
	}
	mutex_unlock(&data->update_lock);
	return ret;
}

static int tmp401_chip_read(struct device *dev, u32 attr, int channel, long *val)
{
	struct tmp401_data *data = dev_get_drvdata(dev);
	u32 regval;
	int ret;

	switch (attr) {
	case hwmon_chip_update_interval:
		ret = regmap_read(data->regmap, TMP401_CONVERSION_RATE, &regval);
		if (ret < 0)
			return ret;
		*val = (1 << (7 - regval)) * 125;
		break;
	case hwmon_chip_temp_reset_history:
		*val = 0;
		break;
	default:
		return -EOPNOTSUPP;
	}

	return 0;
}

static int tmp401_set_convrate(struct regmap *regmap, long val)
{
	int rate;

	/*
	 * For valid rates, interval can be calculated as
	 *	interval = (1 << (7 - rate)) * 125;
	 * Rounded rate is therefore
	 *	rate = 7 - __fls(interval * 4 / (125 * 3));
	 * Use clamp_val() to avoid overflows, and to ensure valid input
	 * for __fls.
	 */
	val = clamp_val(val, 125, 16000);
	rate = 7 - __fls(val * 4 / (125 * 3));
	return regmap_write(regmap, TMP401_CONVERSION_RATE, rate);
}

static int tmp401_chip_write(struct device *dev, u32 attr, int channel, long val)
{
	struct tmp401_data *data = dev_get_drvdata(dev);
	struct regmap *regmap = data->regmap;
	int err;

	mutex_lock(&data->update_lock);
	switch (attr) {
	case hwmon_chip_update_interval:
		err = tmp401_set_convrate(regmap, val);
		break;
	case hwmon_chip_temp_reset_history:
		if (val != 1) {
			err = -EINVAL;
			break;
		}
		/*
		 * Reset history by writing any value to any of the
		 * minimum/maximum registers (0x30-0x37).
		 */
		err = regmap_write(regmap, 0x30, 0);
		break;
	default:
		err = -EOPNOTSUPP;
		break;
	}
	mutex_unlock(&data->update_lock);

	return err;
}

static int tmp401_read(struct device *dev, enum hwmon_sensor_types type,
		       u32 attr, int channel, long *val)
{
	switch (type) {
	case hwmon_chip:
		return tmp401_chip_read(dev, attr, channel, val);
	case hwmon_temp:
		return tmp401_temp_read(dev, attr, channel, val);
	default:
		return -EOPNOTSUPP;
	}
}

static int tmp401_write(struct device *dev, enum hwmon_sensor_types type,
			u32 attr, int channel, long val)
{
	switch (type) {
	case hwmon_chip:
		return tmp401_chip_write(dev, attr, channel, val);
	case hwmon_temp:
		return tmp401_temp_write(dev, attr, channel, val);
	default:
		return -EOPNOTSUPP;
	}
}

static umode_t tmp401_is_visible(const void *data, enum hwmon_sensor_types type,
				 u32 attr, int channel)
{
	switch (type) {
	case hwmon_chip:
		switch (attr) {
		case hwmon_chip_update_interval:
		case hwmon_chip_temp_reset_history:
			return 0644;
		default:
			break;
		}
		break;
	case hwmon_temp:
		switch (attr) {
		case hwmon_temp_input:
		case hwmon_temp_min_alarm:
		case hwmon_temp_max_alarm:
		case hwmon_temp_crit_alarm:
		case hwmon_temp_fault:
		case hwmon_temp_lowest:
		case hwmon_temp_highest:
			return 0444;
		case hwmon_temp_min:
		case hwmon_temp_max:
		case hwmon_temp_crit:
		case hwmon_temp_crit_hyst:
			return 0644;
		default:
			break;
		}
		break;
	default:
		break;
	}
	return 0;
}

static const struct hwmon_ops tmp401_ops = {
	.is_visible = tmp401_is_visible,
	.read = tmp401_read,
	.write = tmp401_write,
};

/* chip initialization, detect, probe */

static int tmp401_init_client(struct tmp401_data *data)
{
	struct regmap *regmap = data->regmap;
	u32 config, config_orig;
	int ret;
	u32 val = 0;
	s32 nfactor = 0;

	/* Set conversion rate to 2 Hz */
	ret = regmap_write(regmap, TMP401_CONVERSION_RATE, 5);
	if (ret < 0)
		return ret;

	/* Start conversions (disable shutdown if necessary) */
	ret = regmap_read(regmap, TMP401_CONFIG, &config);
	if (ret < 0)
		return ret;

	config_orig = config;
	config &= ~TMP401_CONFIG_SHUTDOWN;

	if (of_property_read_bool(data->client->dev.of_node, "ti,extended-range-enable")) {
		/* Enable measurement over extended temperature range */
		config |= TMP401_CONFIG_RANGE;
	}

	data->extended_range = !!(config & TMP401_CONFIG_RANGE);

	if (config != config_orig) {
		ret = regmap_write(regmap, TMP401_CONFIG, config);
		if (ret < 0)
			return ret;
	}

	ret = of_property_read_u32(data->client->dev.of_node, "ti,n-factor", &nfactor);
	if (!ret) {
		if (data->kind == tmp401) {
			dev_err(&data->client->dev, "ti,tmp401 does not support n-factor correction\n");
			return -EINVAL;
		}
		if (nfactor < -128 || nfactor > 127) {
			dev_err(&data->client->dev, "n-factor is invalid (%d)\n", nfactor);
			return -EINVAL;
		}
		ret = regmap_write(regmap, TMP4XX_N_FACTOR_REG, (unsigned int)nfactor);
		if (ret < 0)
			return ret;
	}

	ret = of_property_read_u32(data->client->dev.of_node, "ti,beta-compensation", &val);
	if (!ret) {
		if (data->kind == tmp401 || data->kind == tmp411) {
			dev_err(&data->client->dev, "ti,tmp401 or ti,tmp411 does not support beta compensation\n");
			return -EINVAL;
		}
		if (val > 15) {
			dev_err(&data->client->dev, "beta-compensation is invalid (%u)\n", val);
			return -EINVAL;
		}
		ret = regmap_write(regmap, TMP43X_BETA_RANGE, val);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static int tmp401_detect(struct i2c_client *client,
			 struct i2c_board_info *info)
{
	enum chips kind;
	struct i2c_adapter *adapter = client->adapter;
	u8 reg;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -ENODEV;

	/* Detect and identify the chip */
	reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
	if (reg != TMP401_MANUFACTURER_ID)
		return -ENODEV;

	reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);

	switch (reg) {
	case TMP401_DEVICE_ID:
		if (client->addr != 0x4c)
			return -ENODEV;
		kind = tmp401;
		break;
	case TMP411A_DEVICE_ID:
		if (client->addr != 0x4c)
			return -ENODEV;
		kind = tmp411;
		break;
	case TMP411B_DEVICE_ID:
		if (client->addr != 0x4d)
			return -ENODEV;
		kind = tmp411;
		break;
	case TMP411C_DEVICE_ID:
		if (client->addr != 0x4e)
			return -ENODEV;
		kind = tmp411;
		break;
	case TMP431_DEVICE_ID:
		if (client->addr != 0x4c && client->addr != 0x4d)
			return -ENODEV;
		kind = tmp431;
		break;
	case TMP432_DEVICE_ID:
		if (client->addr != 0x4c && client->addr != 0x4d)
			return -ENODEV;
		kind = tmp432;
		break;
	case TMP435_DEVICE_ID:
		kind = tmp435;
		break;
	default:
		return -ENODEV;
	}

	reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG);
	if (reg & 0x1b)
		return -ENODEV;

	reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE);
	/* Datasheet says: 0x1-0x6 */
	if (reg > 15)
		return -ENODEV;

	strscpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);

	return 0;
}

static int tmp401_probe(struct i2c_client *client)
{
	static const char * const names[] = {
		"TMP401", "TMP411", "TMP431", "TMP432", "TMP435"
	};
	struct device *dev = &client->dev;
	struct hwmon_channel_info *info;
	struct device *hwmon_dev;
	struct tmp401_data *data;
	int status;

	data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->client = client;
	mutex_init(&data->update_lock);
	data->kind = i2c_match_id(tmp401_id, client)->driver_data;

	data->regmap = devm_regmap_init(dev, NULL, data, &tmp401_regmap_config);
	if (IS_ERR(data->regmap))
		return PTR_ERR(data->regmap);

	/* initialize configuration data */
	data->chip.ops = &tmp401_ops;
	data->chip.info = data->info;

	data->info[0] = &data->chip_info;
	data->info[1] = &data->temp_info;

	info = &data->chip_info;
	info->type = hwmon_chip;
	info->config = data->chip_channel_config;

	data->chip_channel_config[0] = HWMON_C_UPDATE_INTERVAL;

	info = &data->temp_info;
	info->type = hwmon_temp;
	info->config = data->temp_channel_config;

	data->temp_channel_config[0] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
		HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
		HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM;
	data->temp_channel_config[1] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
		HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
		HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT;

	if (data->kind == tmp411) {
		data->temp_channel_config[0] |= HWMON_T_HIGHEST | HWMON_T_LOWEST;
		data->temp_channel_config[1] |= HWMON_T_HIGHEST | HWMON_T_LOWEST;
		data->chip_channel_config[0] |= HWMON_C_TEMP_RESET_HISTORY;
	}

	if (data->kind == tmp432) {
		data->temp_channel_config[2] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
			HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
			HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT;
	}

	/* Initialize the TMP401 chip */
	status = tmp401_init_client(data);
	if (status < 0)
		return status;

	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
							 &data->chip, NULL);
	if (IS_ERR(hwmon_dev))
		return PTR_ERR(hwmon_dev);

	dev_info(dev, "Detected TI %s chip\n", names[data->kind]);

	return 0;
}

static const struct of_device_id __maybe_unused tmp4xx_of_match[] = {
	{ .compatible = "ti,tmp401", },
	{ .compatible = "ti,tmp411", },
	{ .compatible = "ti,tmp431", },
	{ .compatible = "ti,tmp432", },
	{ .compatible = "ti,tmp435", },
	{ },
};
MODULE_DEVICE_TABLE(of, tmp4xx_of_match);

static struct i2c_driver tmp401_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "tmp401",
		.of_match_table = of_match_ptr(tmp4xx_of_match),
	},
	.probe		= tmp401_probe,
	.id_table	= tmp401_id,
	.detect		= tmp401_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(tmp401_driver);

MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
MODULE_LICENSE("GPL");