xref: /linux/drivers/hwmon/tmp401.c (revision cc8c418b4fc09ed58ddd27b8e90ec797e9ca1e67)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* tmp401.c
3  *
4  * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>
5  * Preliminary tmp411 support by:
6  * Gabriel Konat, Sander Leget, Wouter Willems
7  * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>
8  *
9  * Cleanup and support for TMP431 and TMP432 by Guenter Roeck
10  * Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
11  */
12 
13 /*
14  * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
15  *
16  * Note this IC is in some aspect similar to the LM90, but it has quite a
17  * few differences too, for example the local temp has a higher resolution
18  * and thus has 16 bits registers for its value and limit instead of 8 bits.
19  */
20 
21 #include <linux/bitops.h>
22 #include <linux/err.h>
23 #include <linux/i2c.h>
24 #include <linux/hwmon.h>
25 #include <linux/init.h>
26 #include <linux/module.h>
27 #include <linux/mutex.h>
28 #include <linux/regmap.h>
29 #include <linux/slab.h>
30 
31 /* Addresses to scan */
32 static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d,
33 	0x4e, 0x4f, I2C_CLIENT_END };
34 
35 enum chips { tmp401, tmp411, tmp431, tmp432, tmp435 };
36 
37 /*
38  * The TMP401 registers, note some registers have different addresses for
39  * reading and writing
40  */
41 #define TMP401_STATUS				0x02
42 #define TMP401_CONFIG				0x03
43 #define TMP401_CONVERSION_RATE			0x04
44 #define TMP4XX_N_FACTOR_REG			0x18
45 #define TMP43X_BETA_RANGE			0x25
46 #define TMP401_TEMP_CRIT_HYST			0x21
47 #define TMP401_MANUFACTURER_ID_REG		0xFE
48 #define TMP401_DEVICE_ID_REG			0xFF
49 
50 static const u8 TMP401_TEMP_MSB[7][3] = {
51 	{ 0x00, 0x01, 0x23 },	/* temp */
52 	{ 0x06, 0x08, 0x16 },	/* low limit */
53 	{ 0x05, 0x07, 0x15 },	/* high limit */
54 	{ 0x20, 0x19, 0x1a },	/* therm (crit) limit */
55 	{ 0x30, 0x34, 0x00 },	/* lowest */
56 	{ 0x32, 0xf6, 0x00 },	/* highest */
57 };
58 
59 /* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
60 static const u8 TMP432_STATUS_REG[] = {
61 	0x1b, 0x36, 0x35, 0x37 };
62 
63 /* Flags */
64 #define TMP401_CONFIG_RANGE			BIT(2)
65 #define TMP401_CONFIG_SHUTDOWN			BIT(6)
66 #define TMP401_STATUS_LOCAL_CRIT		BIT(0)
67 #define TMP401_STATUS_REMOTE_CRIT		BIT(1)
68 #define TMP401_STATUS_REMOTE_OPEN		BIT(2)
69 #define TMP401_STATUS_REMOTE_LOW		BIT(3)
70 #define TMP401_STATUS_REMOTE_HIGH		BIT(4)
71 #define TMP401_STATUS_LOCAL_LOW			BIT(5)
72 #define TMP401_STATUS_LOCAL_HIGH		BIT(6)
73 
74 /* On TMP432, each status has its own register */
75 #define TMP432_STATUS_LOCAL			BIT(0)
76 #define TMP432_STATUS_REMOTE1			BIT(1)
77 #define TMP432_STATUS_REMOTE2			BIT(2)
78 
79 /* Manufacturer / Device ID's */
80 #define TMP401_MANUFACTURER_ID			0x55
81 #define TMP401_DEVICE_ID			0x11
82 #define TMP411A_DEVICE_ID			0x12
83 #define TMP411B_DEVICE_ID			0x13
84 #define TMP411C_DEVICE_ID			0x10
85 #define TMP431_DEVICE_ID			0x31
86 #define TMP432_DEVICE_ID			0x32
87 #define TMP435_DEVICE_ID			0x35
88 
89 /*
90  * Driver data (common to all clients)
91  */
92 
93 static const struct i2c_device_id tmp401_id[] = {
94 	{ "tmp401", tmp401 },
95 	{ "tmp411", tmp411 },
96 	{ "tmp431", tmp431 },
97 	{ "tmp432", tmp432 },
98 	{ "tmp435", tmp435 },
99 	{ }
100 };
101 MODULE_DEVICE_TABLE(i2c, tmp401_id);
102 
103 /*
104  * Client data (each client gets its own)
105  */
106 
107 struct tmp401_data {
108 	struct i2c_client *client;
109 	struct regmap *regmap;
110 	struct mutex update_lock;
111 	enum chips kind;
112 
113 	bool extended_range;
114 
115 	/* hwmon API configuration data */
116 	u32 chip_channel_config[4];
117 	struct hwmon_channel_info chip_info;
118 	u32 temp_channel_config[4];
119 	struct hwmon_channel_info temp_info;
120 	const struct hwmon_channel_info *info[3];
121 	struct hwmon_chip_info chip;
122 };
123 
124 /* regmap */
125 
126 static bool tmp401_regmap_is_volatile(struct device *dev, unsigned int reg)
127 {
128 	switch (reg) {
129 	case 0:			/* local temp msb */
130 	case 1:			/* remote temp msb */
131 	case 2:			/* status */
132 	case 0x10:		/* remote temp lsb */
133 	case 0x15:		/* local temp lsb */
134 	case 0x1b:		/* status (tmp432) */
135 	case 0x23 ... 0x24:	/* remote temp 2 msb / lsb */
136 	case 0x30 ... 0x37:	/* lowest/highest temp; status (tmp432) */
137 		return true;
138 	default:
139 		return false;
140 	}
141 }
142 
143 static int tmp401_reg_read(void *context, unsigned int reg, unsigned int *val)
144 {
145 	struct tmp401_data *data = context;
146 	struct i2c_client *client = data->client;
147 	int regval;
148 
149 	switch (reg) {
150 	case 0:			/* local temp msb */
151 	case 1:			/* remote temp msb */
152 	case 5:			/* local temp high limit msb */
153 	case 6:			/* local temp low limit msb */
154 	case 7:			/* remote temp ligh limit msb */
155 	case 8:			/* remote temp low limit msb */
156 	case 0x15:		/* remote temp 2 high limit msb */
157 	case 0x16:		/* remote temp 2 low limit msb */
158 	case 0x23:		/* remote temp 2 msb */
159 	case 0x30:		/* local temp minimum, tmp411 */
160 	case 0x32:		/* local temp maximum, tmp411 */
161 	case 0x34:		/* remote temp minimum, tmp411 */
162 	case 0xf6:		/* remote temp maximum, tmp411 (really 0x36) */
163 		/* work around register overlap between TMP411 and TMP432 */
164 		if (reg == 0xf6)
165 			reg = 0x36;
166 		regval = i2c_smbus_read_word_swapped(client, reg);
167 		if (regval < 0)
168 			return regval;
169 		*val = regval;
170 		break;
171 	case 0x19:		/* critical limits, 8-bit registers */
172 	case 0x1a:
173 	case 0x20:
174 		regval = i2c_smbus_read_byte_data(client, reg);
175 		if (regval < 0)
176 			return regval;
177 		*val = regval << 8;
178 		break;
179 	case 0x1b:
180 	case 0x35 ... 0x37:
181 		if (data->kind == tmp432) {
182 			regval = i2c_smbus_read_byte_data(client, reg);
183 			if (regval < 0)
184 				return regval;
185 			*val = regval;
186 			break;
187 		}
188 		/* simulate TMP432 status registers */
189 		regval = i2c_smbus_read_byte_data(client, TMP401_STATUS);
190 		if (regval < 0)
191 			return regval;
192 		*val = 0;
193 		switch (reg) {
194 		case 0x1b:	/* open / fault */
195 			if (regval & TMP401_STATUS_REMOTE_OPEN)
196 				*val |= BIT(1);
197 			break;
198 		case 0x35:	/* high limit */
199 			if (regval & TMP401_STATUS_LOCAL_HIGH)
200 				*val |= BIT(0);
201 			if (regval & TMP401_STATUS_REMOTE_HIGH)
202 				*val |= BIT(1);
203 			break;
204 		case 0x36:	/* low limit */
205 			if (regval & TMP401_STATUS_LOCAL_LOW)
206 				*val |= BIT(0);
207 			if (regval & TMP401_STATUS_REMOTE_LOW)
208 				*val |= BIT(1);
209 			break;
210 		case 0x37:	/* therm / crit limit */
211 			if (regval & TMP401_STATUS_LOCAL_CRIT)
212 				*val |= BIT(0);
213 			if (regval & TMP401_STATUS_REMOTE_CRIT)
214 				*val |= BIT(1);
215 			break;
216 		}
217 		break;
218 	default:
219 		regval = i2c_smbus_read_byte_data(client, reg);
220 		if (regval < 0)
221 			return regval;
222 		*val = regval;
223 		break;
224 	}
225 	return 0;
226 }
227 
228 static int tmp401_reg_write(void *context, unsigned int reg, unsigned int val)
229 {
230 	struct tmp401_data *data = context;
231 	struct i2c_client *client = data->client;
232 
233 	switch (reg) {
234 	case 0x05:		/* local temp high limit msb */
235 	case 0x06:		/* local temp low limit msb */
236 	case 0x07:		/* remote temp ligh limit msb */
237 	case 0x08:		/* remote temp low limit msb */
238 		reg += 6;	/* adjust for register write address */
239 		fallthrough;
240 	case 0x15:		/* remote temp 2 high limit msb */
241 	case 0x16:		/* remote temp 2 low limit msb */
242 		return i2c_smbus_write_word_swapped(client, reg, val);
243 	case 0x19:		/* critical limits, 8-bit registers */
244 	case 0x1a:
245 	case 0x20:
246 		return i2c_smbus_write_byte_data(client, reg, val >> 8);
247 	case TMP401_CONVERSION_RATE:
248 	case TMP401_CONFIG:
249 		reg += 6;	/* adjust for register write address */
250 		fallthrough;
251 	default:
252 		return i2c_smbus_write_byte_data(client, reg, val);
253 	}
254 }
255 
256 static const struct regmap_config tmp401_regmap_config = {
257 	.reg_bits = 8,
258 	.val_bits = 16,
259 	.cache_type = REGCACHE_RBTREE,
260 	.volatile_reg = tmp401_regmap_is_volatile,
261 	.reg_read = tmp401_reg_read,
262 	.reg_write = tmp401_reg_write,
263 };
264 
265 /* temperature conversion */
266 
267 static int tmp401_register_to_temp(u16 reg, bool extended)
268 {
269 	int temp = reg;
270 
271 	if (extended)
272 		temp -= 64 * 256;
273 
274 	return DIV_ROUND_CLOSEST(temp * 125, 32);
275 }
276 
277 static u16 tmp401_temp_to_register(long temp, bool extended, int zbits)
278 {
279 	if (extended) {
280 		temp = clamp_val(temp, -64000, 191000);
281 		temp += 64000;
282 	} else {
283 		temp = clamp_val(temp, 0, 127000);
284 	}
285 
286 	return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
287 }
288 
289 /* hwmon API functions */
290 
291 static const u8 tmp401_temp_reg_index[] = {
292 	[hwmon_temp_input] = 0,
293 	[hwmon_temp_min] = 1,
294 	[hwmon_temp_max] = 2,
295 	[hwmon_temp_crit] = 3,
296 	[hwmon_temp_lowest] = 4,
297 	[hwmon_temp_highest] = 5,
298 };
299 
300 static const u8 tmp401_status_reg_index[] = {
301 	[hwmon_temp_fault] = 0,
302 	[hwmon_temp_min_alarm] = 1,
303 	[hwmon_temp_max_alarm] = 2,
304 	[hwmon_temp_crit_alarm] = 3,
305 };
306 
307 static int tmp401_temp_read(struct device *dev, u32 attr, int channel, long *val)
308 {
309 	struct tmp401_data *data = dev_get_drvdata(dev);
310 	struct regmap *regmap = data->regmap;
311 	unsigned int regval;
312 	int reg, ret;
313 
314 	switch (attr) {
315 	case hwmon_temp_input:
316 	case hwmon_temp_min:
317 	case hwmon_temp_max:
318 	case hwmon_temp_crit:
319 	case hwmon_temp_lowest:
320 	case hwmon_temp_highest:
321 		reg = TMP401_TEMP_MSB[tmp401_temp_reg_index[attr]][channel];
322 		ret = regmap_read(regmap, reg, &regval);
323 		if (ret < 0)
324 			return ret;
325 		*val = tmp401_register_to_temp(regval, data->extended_range);
326 		break;
327 	case hwmon_temp_crit_hyst:
328 		mutex_lock(&data->update_lock);
329 		reg = TMP401_TEMP_MSB[3][channel];
330 		ret = regmap_read(regmap, reg, &regval);
331 		if (ret < 0)
332 			goto unlock;
333 		*val = tmp401_register_to_temp(regval, data->extended_range);
334 		ret = regmap_read(regmap, TMP401_TEMP_CRIT_HYST, &regval);
335 		if (ret < 0)
336 			goto unlock;
337 		*val -= regval * 1000;
338 unlock:
339 		mutex_unlock(&data->update_lock);
340 		if (ret < 0)
341 			return ret;
342 		break;
343 	case hwmon_temp_fault:
344 	case hwmon_temp_min_alarm:
345 	case hwmon_temp_max_alarm:
346 	case hwmon_temp_crit_alarm:
347 		reg = TMP432_STATUS_REG[tmp401_status_reg_index[attr]];
348 		ret = regmap_read(regmap, reg, &regval);
349 		if (ret < 0)
350 			return ret;
351 		*val = !!(regval & BIT(channel));
352 		break;
353 	default:
354 		return -EOPNOTSUPP;
355 	}
356 	return 0;
357 }
358 
359 static int tmp401_temp_write(struct device *dev, u32 attr, int channel,
360 			     long val)
361 {
362 	struct tmp401_data *data = dev_get_drvdata(dev);
363 	struct regmap *regmap = data->regmap;
364 	unsigned int regval;
365 	int reg, ret, temp;
366 
367 	mutex_lock(&data->update_lock);
368 	switch (attr) {
369 	case hwmon_temp_min:
370 	case hwmon_temp_max:
371 	case hwmon_temp_crit:
372 		reg = TMP401_TEMP_MSB[tmp401_temp_reg_index[attr]][channel];
373 		regval = tmp401_temp_to_register(val, data->extended_range,
374 						 attr == hwmon_temp_crit ? 8 : 4);
375 		ret = regmap_write(regmap, reg, regval);
376 		break;
377 	case hwmon_temp_crit_hyst:
378 		if (data->extended_range)
379 			val = clamp_val(val, -64000, 191000);
380 		else
381 			val = clamp_val(val, 0, 127000);
382 
383 		reg = TMP401_TEMP_MSB[3][channel];
384 		ret = regmap_read(regmap, reg, &regval);
385 		if (ret < 0)
386 			break;
387 		temp = tmp401_register_to_temp(regval, data->extended_range);
388 		val = clamp_val(val, temp - 255000, temp);
389 		regval = ((temp - val) + 500) / 1000;
390 		ret = regmap_write(regmap, TMP401_TEMP_CRIT_HYST, regval);
391 		break;
392 	default:
393 		ret = -EOPNOTSUPP;
394 		break;
395 	}
396 	mutex_unlock(&data->update_lock);
397 	return ret;
398 }
399 
400 static int tmp401_chip_read(struct device *dev, u32 attr, int channel, long *val)
401 {
402 	struct tmp401_data *data = dev_get_drvdata(dev);
403 	u32 regval;
404 	int ret;
405 
406 	switch (attr) {
407 	case hwmon_chip_update_interval:
408 		ret = regmap_read(data->regmap, TMP401_CONVERSION_RATE, &regval);
409 		if (ret < 0)
410 			return ret;
411 		*val = (1 << (7 - regval)) * 125;
412 		break;
413 	case hwmon_chip_temp_reset_history:
414 		*val = 0;
415 		break;
416 	default:
417 		return -EOPNOTSUPP;
418 	}
419 
420 	return 0;
421 }
422 
423 static int tmp401_set_convrate(struct regmap *regmap, long val)
424 {
425 	int rate;
426 
427 	/*
428 	 * For valid rates, interval can be calculated as
429 	 *	interval = (1 << (7 - rate)) * 125;
430 	 * Rounded rate is therefore
431 	 *	rate = 7 - __fls(interval * 4 / (125 * 3));
432 	 * Use clamp_val() to avoid overflows, and to ensure valid input
433 	 * for __fls.
434 	 */
435 	val = clamp_val(val, 125, 16000);
436 	rate = 7 - __fls(val * 4 / (125 * 3));
437 	return regmap_write(regmap, TMP401_CONVERSION_RATE, rate);
438 }
439 
440 static int tmp401_chip_write(struct device *dev, u32 attr, int channel, long val)
441 {
442 	struct tmp401_data *data = dev_get_drvdata(dev);
443 	struct regmap *regmap = data->regmap;
444 	int err;
445 
446 	mutex_lock(&data->update_lock);
447 	switch (attr) {
448 	case hwmon_chip_update_interval:
449 		err = tmp401_set_convrate(regmap, val);
450 		break;
451 	case hwmon_chip_temp_reset_history:
452 		if (val != 1) {
453 			err = -EINVAL;
454 			break;
455 		}
456 		/*
457 		 * Reset history by writing any value to any of the
458 		 * minimum/maximum registers (0x30-0x37).
459 		 */
460 		err = regmap_write(regmap, 0x30, 0);
461 		break;
462 	default:
463 		err = -EOPNOTSUPP;
464 		break;
465 	}
466 	mutex_unlock(&data->update_lock);
467 
468 	return err;
469 }
470 
471 static int tmp401_read(struct device *dev, enum hwmon_sensor_types type,
472 		       u32 attr, int channel, long *val)
473 {
474 	switch (type) {
475 	case hwmon_chip:
476 		return tmp401_chip_read(dev, attr, channel, val);
477 	case hwmon_temp:
478 		return tmp401_temp_read(dev, attr, channel, val);
479 	default:
480 		return -EOPNOTSUPP;
481 	}
482 }
483 
484 static int tmp401_write(struct device *dev, enum hwmon_sensor_types type,
485 			u32 attr, int channel, long val)
486 {
487 	switch (type) {
488 	case hwmon_chip:
489 		return tmp401_chip_write(dev, attr, channel, val);
490 	case hwmon_temp:
491 		return tmp401_temp_write(dev, attr, channel, val);
492 	default:
493 		return -EOPNOTSUPP;
494 	}
495 }
496 
497 static umode_t tmp401_is_visible(const void *data, enum hwmon_sensor_types type,
498 				 u32 attr, int channel)
499 {
500 	switch (type) {
501 	case hwmon_chip:
502 		switch (attr) {
503 		case hwmon_chip_update_interval:
504 		case hwmon_chip_temp_reset_history:
505 			return 0644;
506 		default:
507 			break;
508 		}
509 		break;
510 	case hwmon_temp:
511 		switch (attr) {
512 		case hwmon_temp_input:
513 		case hwmon_temp_min_alarm:
514 		case hwmon_temp_max_alarm:
515 		case hwmon_temp_crit_alarm:
516 		case hwmon_temp_fault:
517 		case hwmon_temp_lowest:
518 		case hwmon_temp_highest:
519 			return 0444;
520 		case hwmon_temp_min:
521 		case hwmon_temp_max:
522 		case hwmon_temp_crit:
523 		case hwmon_temp_crit_hyst:
524 			return 0644;
525 		default:
526 			break;
527 		}
528 		break;
529 	default:
530 		break;
531 	}
532 	return 0;
533 }
534 
535 static const struct hwmon_ops tmp401_ops = {
536 	.is_visible = tmp401_is_visible,
537 	.read = tmp401_read,
538 	.write = tmp401_write,
539 };
540 
541 /* chip initialization, detect, probe */
542 
543 static int tmp401_init_client(struct tmp401_data *data)
544 {
545 	struct regmap *regmap = data->regmap;
546 	u32 config, config_orig;
547 	int ret;
548 	u32 val = 0;
549 	s32 nfactor = 0;
550 
551 	/* Set conversion rate to 2 Hz */
552 	ret = regmap_write(regmap, TMP401_CONVERSION_RATE, 5);
553 	if (ret < 0)
554 		return ret;
555 
556 	/* Start conversions (disable shutdown if necessary) */
557 	ret = regmap_read(regmap, TMP401_CONFIG, &config);
558 	if (ret < 0)
559 		return ret;
560 
561 	config_orig = config;
562 	config &= ~TMP401_CONFIG_SHUTDOWN;
563 
564 	if (of_property_read_bool(data->client->dev.of_node, "ti,extended-range-enable")) {
565 		/* Enable measurement over extended temperature range */
566 		config |= TMP401_CONFIG_RANGE;
567 	}
568 
569 	data->extended_range = !!(config & TMP401_CONFIG_RANGE);
570 
571 	if (config != config_orig) {
572 		ret = regmap_write(regmap, TMP401_CONFIG, config);
573 		if (ret < 0)
574 			return ret;
575 	}
576 
577 	ret = of_property_read_u32(data->client->dev.of_node, "ti,n-factor", &nfactor);
578 	if (!ret) {
579 		if (data->kind == tmp401) {
580 			dev_err(&data->client->dev, "ti,tmp401 does not support n-factor correction\n");
581 			return -EINVAL;
582 		}
583 		if (nfactor < -128 || nfactor > 127) {
584 			dev_err(&data->client->dev, "n-factor is invalid (%d)\n", nfactor);
585 			return -EINVAL;
586 		}
587 		ret = regmap_write(regmap, TMP4XX_N_FACTOR_REG, (unsigned int)nfactor);
588 		if (ret < 0)
589 			return ret;
590 	}
591 
592 	ret = of_property_read_u32(data->client->dev.of_node, "ti,beta-compensation", &val);
593 	if (!ret) {
594 		if (data->kind == tmp401 || data->kind == tmp411) {
595 			dev_err(&data->client->dev, "ti,tmp401 or ti,tmp411 does not support beta compensation\n");
596 			return -EINVAL;
597 		}
598 		if (val > 15) {
599 			dev_err(&data->client->dev, "beta-compensation is invalid (%u)\n", val);
600 			return -EINVAL;
601 		}
602 		ret = regmap_write(regmap, TMP43X_BETA_RANGE, val);
603 		if (ret < 0)
604 			return ret;
605 	}
606 
607 	return 0;
608 }
609 
610 static int tmp401_detect(struct i2c_client *client,
611 			 struct i2c_board_info *info)
612 {
613 	enum chips kind;
614 	struct i2c_adapter *adapter = client->adapter;
615 	u8 reg;
616 
617 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
618 		return -ENODEV;
619 
620 	/* Detect and identify the chip */
621 	reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
622 	if (reg != TMP401_MANUFACTURER_ID)
623 		return -ENODEV;
624 
625 	reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
626 
627 	switch (reg) {
628 	case TMP401_DEVICE_ID:
629 		if (client->addr != 0x4c)
630 			return -ENODEV;
631 		kind = tmp401;
632 		break;
633 	case TMP411A_DEVICE_ID:
634 		if (client->addr != 0x4c)
635 			return -ENODEV;
636 		kind = tmp411;
637 		break;
638 	case TMP411B_DEVICE_ID:
639 		if (client->addr != 0x4d)
640 			return -ENODEV;
641 		kind = tmp411;
642 		break;
643 	case TMP411C_DEVICE_ID:
644 		if (client->addr != 0x4e)
645 			return -ENODEV;
646 		kind = tmp411;
647 		break;
648 	case TMP431_DEVICE_ID:
649 		if (client->addr != 0x4c && client->addr != 0x4d)
650 			return -ENODEV;
651 		kind = tmp431;
652 		break;
653 	case TMP432_DEVICE_ID:
654 		if (client->addr != 0x4c && client->addr != 0x4d)
655 			return -ENODEV;
656 		kind = tmp432;
657 		break;
658 	case TMP435_DEVICE_ID:
659 		kind = tmp435;
660 		break;
661 	default:
662 		return -ENODEV;
663 	}
664 
665 	reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG);
666 	if (reg & 0x1b)
667 		return -ENODEV;
668 
669 	reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE);
670 	/* Datasheet says: 0x1-0x6 */
671 	if (reg > 15)
672 		return -ENODEV;
673 
674 	strscpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
675 
676 	return 0;
677 }
678 
679 static int tmp401_probe(struct i2c_client *client)
680 {
681 	static const char * const names[] = {
682 		"TMP401", "TMP411", "TMP431", "TMP432", "TMP435"
683 	};
684 	struct device *dev = &client->dev;
685 	struct hwmon_channel_info *info;
686 	struct device *hwmon_dev;
687 	struct tmp401_data *data;
688 	int status;
689 
690 	data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
691 	if (!data)
692 		return -ENOMEM;
693 
694 	data->client = client;
695 	mutex_init(&data->update_lock);
696 	data->kind = i2c_match_id(tmp401_id, client)->driver_data;
697 
698 	data->regmap = devm_regmap_init(dev, NULL, data, &tmp401_regmap_config);
699 	if (IS_ERR(data->regmap))
700 		return PTR_ERR(data->regmap);
701 
702 	/* initialize configuration data */
703 	data->chip.ops = &tmp401_ops;
704 	data->chip.info = data->info;
705 
706 	data->info[0] = &data->chip_info;
707 	data->info[1] = &data->temp_info;
708 
709 	info = &data->chip_info;
710 	info->type = hwmon_chip;
711 	info->config = data->chip_channel_config;
712 
713 	data->chip_channel_config[0] = HWMON_C_UPDATE_INTERVAL;
714 
715 	info = &data->temp_info;
716 	info->type = hwmon_temp;
717 	info->config = data->temp_channel_config;
718 
719 	data->temp_channel_config[0] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
720 		HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
721 		HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM;
722 	data->temp_channel_config[1] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
723 		HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
724 		HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT;
725 
726 	if (data->kind == tmp411) {
727 		data->temp_channel_config[0] |= HWMON_T_HIGHEST | HWMON_T_LOWEST;
728 		data->temp_channel_config[1] |= HWMON_T_HIGHEST | HWMON_T_LOWEST;
729 		data->chip_channel_config[0] |= HWMON_C_TEMP_RESET_HISTORY;
730 	}
731 
732 	if (data->kind == tmp432) {
733 		data->temp_channel_config[2] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
734 			HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
735 			HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT;
736 	}
737 
738 	/* Initialize the TMP401 chip */
739 	status = tmp401_init_client(data);
740 	if (status < 0)
741 		return status;
742 
743 	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
744 							 &data->chip, NULL);
745 	if (IS_ERR(hwmon_dev))
746 		return PTR_ERR(hwmon_dev);
747 
748 	dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
749 
750 	return 0;
751 }
752 
753 static const struct of_device_id __maybe_unused tmp4xx_of_match[] = {
754 	{ .compatible = "ti,tmp401", },
755 	{ .compatible = "ti,tmp411", },
756 	{ .compatible = "ti,tmp431", },
757 	{ .compatible = "ti,tmp432", },
758 	{ .compatible = "ti,tmp435", },
759 	{ },
760 };
761 MODULE_DEVICE_TABLE(of, tmp4xx_of_match);
762 
763 static struct i2c_driver tmp401_driver = {
764 	.class		= I2C_CLASS_HWMON,
765 	.driver = {
766 		.name	= "tmp401",
767 		.of_match_table = of_match_ptr(tmp4xx_of_match),
768 	},
769 	.probe_new	= tmp401_probe,
770 	.id_table	= tmp401_id,
771 	.detect		= tmp401_detect,
772 	.address_list	= normal_i2c,
773 };
774 
775 module_i2c_driver(tmp401_driver);
776 
777 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
778 MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
779 MODULE_LICENSE("GPL");
780