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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 */
32static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d,
33 0x4e, 0x4f, I2C_CLIENT_END };
34
35enum 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
50static 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 */
60static 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
93static const struct i2c_device_id tmp401_id[] = {
94 { "tmp401", tmp401 },
95 { "tmp411", tmp411 },
96 { "tmp431", tmp431 },
97 { "tmp432", tmp432 },
98 { "tmp435", tmp435 },
99 { }
100};
101MODULE_DEVICE_TABLE(i2c, tmp401_id);
102
103/*
104 * Client data (each client gets its own)
105 */
106
107struct 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
126static 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
143static 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
228static 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
256static 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
267static 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
277static 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
291static 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
300static 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
307static 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, ®val);
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, ®val);
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, ®val);
335 if (ret < 0)
336 goto unlock;
337 *val -= regval * 1000;
338unlock:
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, ®val);
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
359static 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, ®val);
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
400static 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, ®val);
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
423static 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
440static 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
471static 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
484static 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
497static 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
535static 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
543static 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
610static 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
679static 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
753static 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};
761MODULE_DEVICE_TABLE(of, tmp4xx_of_match);
762
763static 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 = tmp401_probe,
770 .id_table = tmp401_id,
771 .detect = tmp401_detect,
772 .address_list = normal_i2c,
773};
774
775module_i2c_driver(tmp401_driver);
776
777MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
778MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
779MODULE_LICENSE("GPL");
1/* tmp401.c
2 *
3 * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>
4 * Preliminary tmp411 support by:
5 * Gabriel Konat, Sander Leget, Wouter Willems
6 * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>
7 *
8 * Cleanup and support for TMP431 and TMP432 by Guenter Roeck
9 * Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26/*
27 * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
28 *
29 * Note this IC is in some aspect similar to the LM90, but it has quite a
30 * few differences too, for example the local temp has a higher resolution
31 * and thus has 16 bits registers for its value and limit instead of 8 bits.
32 */
33
34#include <linux/module.h>
35#include <linux/init.h>
36#include <linux/bitops.h>
37#include <linux/slab.h>
38#include <linux/jiffies.h>
39#include <linux/i2c.h>
40#include <linux/hwmon.h>
41#include <linux/hwmon-sysfs.h>
42#include <linux/err.h>
43#include <linux/mutex.h>
44#include <linux/sysfs.h>
45
46/* Addresses to scan */
47static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d,
48 0x4e, 0x4f, I2C_CLIENT_END };
49
50enum chips { tmp401, tmp411, tmp431, tmp432, tmp435, tmp461 };
51
52/*
53 * The TMP401 registers, note some registers have different addresses for
54 * reading and writing
55 */
56#define TMP401_STATUS 0x02
57#define TMP401_CONFIG_READ 0x03
58#define TMP401_CONFIG_WRITE 0x09
59#define TMP401_CONVERSION_RATE_READ 0x04
60#define TMP401_CONVERSION_RATE_WRITE 0x0A
61#define TMP401_TEMP_CRIT_HYST 0x21
62#define TMP401_MANUFACTURER_ID_REG 0xFE
63#define TMP401_DEVICE_ID_REG 0xFF
64
65static const u8 TMP401_TEMP_MSB_READ[7][2] = {
66 { 0x00, 0x01 }, /* temp */
67 { 0x06, 0x08 }, /* low limit */
68 { 0x05, 0x07 }, /* high limit */
69 { 0x20, 0x19 }, /* therm (crit) limit */
70 { 0x30, 0x34 }, /* lowest */
71 { 0x32, 0x36 }, /* highest */
72 { 0, 0x11 }, /* offset */
73};
74
75static const u8 TMP401_TEMP_MSB_WRITE[7][2] = {
76 { 0, 0 }, /* temp (unused) */
77 { 0x0C, 0x0E }, /* low limit */
78 { 0x0B, 0x0D }, /* high limit */
79 { 0x20, 0x19 }, /* therm (crit) limit */
80 { 0x30, 0x34 }, /* lowest */
81 { 0x32, 0x36 }, /* highest */
82 { 0, 0x11 }, /* offset */
83};
84
85static const u8 TMP432_TEMP_MSB_READ[4][3] = {
86 { 0x00, 0x01, 0x23 }, /* temp */
87 { 0x06, 0x08, 0x16 }, /* low limit */
88 { 0x05, 0x07, 0x15 }, /* high limit */
89 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
90};
91
92static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
93 { 0, 0, 0 }, /* temp - unused */
94 { 0x0C, 0x0E, 0x16 }, /* low limit */
95 { 0x0B, 0x0D, 0x15 }, /* high limit */
96 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
97};
98
99/* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
100static const u8 TMP432_STATUS_REG[] = {
101 0x1b, 0x36, 0x35, 0x37 };
102
103/* Flags */
104#define TMP401_CONFIG_RANGE BIT(2)
105#define TMP401_CONFIG_SHUTDOWN BIT(6)
106#define TMP401_STATUS_LOCAL_CRIT BIT(0)
107#define TMP401_STATUS_REMOTE_CRIT BIT(1)
108#define TMP401_STATUS_REMOTE_OPEN BIT(2)
109#define TMP401_STATUS_REMOTE_LOW BIT(3)
110#define TMP401_STATUS_REMOTE_HIGH BIT(4)
111#define TMP401_STATUS_LOCAL_LOW BIT(5)
112#define TMP401_STATUS_LOCAL_HIGH BIT(6)
113
114/* On TMP432, each status has its own register */
115#define TMP432_STATUS_LOCAL BIT(0)
116#define TMP432_STATUS_REMOTE1 BIT(1)
117#define TMP432_STATUS_REMOTE2 BIT(2)
118
119/* Manufacturer / Device ID's */
120#define TMP401_MANUFACTURER_ID 0x55
121#define TMP401_DEVICE_ID 0x11
122#define TMP411A_DEVICE_ID 0x12
123#define TMP411B_DEVICE_ID 0x13
124#define TMP411C_DEVICE_ID 0x10
125#define TMP431_DEVICE_ID 0x31
126#define TMP432_DEVICE_ID 0x32
127#define TMP435_DEVICE_ID 0x35
128
129/*
130 * Driver data (common to all clients)
131 */
132
133static const struct i2c_device_id tmp401_id[] = {
134 { "tmp401", tmp401 },
135 { "tmp411", tmp411 },
136 { "tmp431", tmp431 },
137 { "tmp432", tmp432 },
138 { "tmp435", tmp435 },
139 { "tmp461", tmp461 },
140 { }
141};
142MODULE_DEVICE_TABLE(i2c, tmp401_id);
143
144/*
145 * Client data (each client gets its own)
146 */
147
148struct tmp401_data {
149 struct i2c_client *client;
150 const struct attribute_group *groups[3];
151 struct mutex update_lock;
152 char valid; /* zero until following fields are valid */
153 unsigned long last_updated; /* in jiffies */
154 enum chips kind;
155
156 unsigned int update_interval; /* in milliseconds */
157
158 /* register values */
159 u8 status[4];
160 u8 config;
161 u16 temp[7][3];
162 u8 temp_crit_hyst;
163};
164
165/*
166 * Sysfs attr show / store functions
167 */
168
169static int tmp401_register_to_temp(u16 reg, u8 config)
170{
171 int temp = reg;
172
173 if (config & TMP401_CONFIG_RANGE)
174 temp -= 64 * 256;
175
176 return DIV_ROUND_CLOSEST(temp * 125, 32);
177}
178
179static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
180{
181 if (config & TMP401_CONFIG_RANGE) {
182 temp = clamp_val(temp, -64000, 191000);
183 temp += 64000;
184 } else
185 temp = clamp_val(temp, 0, 127000);
186
187 return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
188}
189
190static int tmp401_update_device_reg16(struct i2c_client *client,
191 struct tmp401_data *data)
192{
193 int i, j, val;
194 int num_regs = data->kind == tmp411 ? 6 : 4;
195 int num_sensors = data->kind == tmp432 ? 3 : 2;
196
197 for (i = 0; i < num_sensors; i++) { /* local / r1 / r2 */
198 for (j = 0; j < num_regs; j++) { /* temp / low / ... */
199 u8 regaddr;
200
201 regaddr = data->kind == tmp432 ?
202 TMP432_TEMP_MSB_READ[j][i] :
203 TMP401_TEMP_MSB_READ[j][i];
204 if (j == 3) { /* crit is msb only */
205 val = i2c_smbus_read_byte_data(client, regaddr);
206 } else {
207 val = i2c_smbus_read_word_swapped(client,
208 regaddr);
209 }
210 if (val < 0)
211 return val;
212
213 data->temp[j][i] = j == 3 ? val << 8 : val;
214 }
215 }
216 return 0;
217}
218
219static struct tmp401_data *tmp401_update_device(struct device *dev)
220{
221 struct tmp401_data *data = dev_get_drvdata(dev);
222 struct i2c_client *client = data->client;
223 struct tmp401_data *ret = data;
224 int i, val;
225 unsigned long next_update;
226
227 mutex_lock(&data->update_lock);
228
229 next_update = data->last_updated +
230 msecs_to_jiffies(data->update_interval);
231 if (time_after(jiffies, next_update) || !data->valid) {
232 if (data->kind != tmp432) {
233 /*
234 * The driver uses the TMP432 status format internally.
235 * Convert status to TMP432 format for other chips.
236 */
237 val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
238 if (val < 0) {
239 ret = ERR_PTR(val);
240 goto abort;
241 }
242 data->status[0] =
243 (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
244 data->status[1] =
245 ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
246 ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
247 data->status[2] =
248 ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
249 ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
250 data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
251 | TMP401_STATUS_REMOTE_CRIT);
252 } else {
253 for (i = 0; i < ARRAY_SIZE(data->status); i++) {
254 val = i2c_smbus_read_byte_data(client,
255 TMP432_STATUS_REG[i]);
256 if (val < 0) {
257 ret = ERR_PTR(val);
258 goto abort;
259 }
260 data->status[i] = val;
261 }
262 }
263
264 val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
265 if (val < 0) {
266 ret = ERR_PTR(val);
267 goto abort;
268 }
269 data->config = val;
270 val = tmp401_update_device_reg16(client, data);
271 if (val < 0) {
272 ret = ERR_PTR(val);
273 goto abort;
274 }
275 val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
276 if (val < 0) {
277 ret = ERR_PTR(val);
278 goto abort;
279 }
280 data->temp_crit_hyst = val;
281
282 data->last_updated = jiffies;
283 data->valid = 1;
284 }
285
286abort:
287 mutex_unlock(&data->update_lock);
288 return ret;
289}
290
291static ssize_t show_temp(struct device *dev,
292 struct device_attribute *devattr, char *buf)
293{
294 int nr = to_sensor_dev_attr_2(devattr)->nr;
295 int index = to_sensor_dev_attr_2(devattr)->index;
296 struct tmp401_data *data = tmp401_update_device(dev);
297
298 if (IS_ERR(data))
299 return PTR_ERR(data);
300
301 return sprintf(buf, "%d\n",
302 tmp401_register_to_temp(data->temp[nr][index], data->config));
303}
304
305static ssize_t show_temp_crit_hyst(struct device *dev,
306 struct device_attribute *devattr, char *buf)
307{
308 int temp, index = to_sensor_dev_attr(devattr)->index;
309 struct tmp401_data *data = tmp401_update_device(dev);
310
311 if (IS_ERR(data))
312 return PTR_ERR(data);
313
314 mutex_lock(&data->update_lock);
315 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
316 temp -= data->temp_crit_hyst * 1000;
317 mutex_unlock(&data->update_lock);
318
319 return sprintf(buf, "%d\n", temp);
320}
321
322static ssize_t show_status(struct device *dev,
323 struct device_attribute *devattr, char *buf)
324{
325 int nr = to_sensor_dev_attr_2(devattr)->nr;
326 int mask = to_sensor_dev_attr_2(devattr)->index;
327 struct tmp401_data *data = tmp401_update_device(dev);
328
329 if (IS_ERR(data))
330 return PTR_ERR(data);
331
332 return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
333}
334
335static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
336 const char *buf, size_t count)
337{
338 int nr = to_sensor_dev_attr_2(devattr)->nr;
339 int index = to_sensor_dev_attr_2(devattr)->index;
340 struct tmp401_data *data = dev_get_drvdata(dev);
341 struct i2c_client *client = data->client;
342 long val;
343 u16 reg;
344 u8 regaddr;
345
346 if (kstrtol(buf, 10, &val))
347 return -EINVAL;
348
349 reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
350
351 mutex_lock(&data->update_lock);
352
353 regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
354 : TMP401_TEMP_MSB_WRITE[nr][index];
355 if (nr == 3) { /* crit is msb only */
356 i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
357 } else {
358 /* Hardware expects big endian data --> use _swapped */
359 i2c_smbus_write_word_swapped(client, regaddr, reg);
360 }
361 data->temp[nr][index] = reg;
362
363 mutex_unlock(&data->update_lock);
364
365 return count;
366}
367
368static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
369 *devattr, const char *buf, size_t count)
370{
371 int temp, index = to_sensor_dev_attr(devattr)->index;
372 struct tmp401_data *data = tmp401_update_device(dev);
373 long val;
374 u8 reg;
375
376 if (IS_ERR(data))
377 return PTR_ERR(data);
378
379 if (kstrtol(buf, 10, &val))
380 return -EINVAL;
381
382 if (data->config & TMP401_CONFIG_RANGE)
383 val = clamp_val(val, -64000, 191000);
384 else
385 val = clamp_val(val, 0, 127000);
386
387 mutex_lock(&data->update_lock);
388 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
389 val = clamp_val(val, temp - 255000, temp);
390 reg = ((temp - val) + 500) / 1000;
391
392 i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
393 reg);
394
395 data->temp_crit_hyst = reg;
396
397 mutex_unlock(&data->update_lock);
398
399 return count;
400}
401
402/*
403 * Resets the historical measurements of minimum and maximum temperatures.
404 * This is done by writing any value to any of the minimum/maximum registers
405 * (0x30-0x37).
406 */
407static ssize_t reset_temp_history(struct device *dev,
408 struct device_attribute *devattr, const char *buf, size_t count)
409{
410 struct tmp401_data *data = dev_get_drvdata(dev);
411 struct i2c_client *client = data->client;
412 long val;
413
414 if (kstrtol(buf, 10, &val))
415 return -EINVAL;
416
417 if (val != 1) {
418 dev_err(dev,
419 "temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
420 val);
421 return -EINVAL;
422 }
423 mutex_lock(&data->update_lock);
424 i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
425 data->valid = 0;
426 mutex_unlock(&data->update_lock);
427
428 return count;
429}
430
431static ssize_t update_interval_show(struct device *dev,
432 struct device_attribute *attr, char *buf)
433{
434 struct tmp401_data *data = dev_get_drvdata(dev);
435
436 return sprintf(buf, "%u\n", data->update_interval);
437}
438
439static ssize_t update_interval_store(struct device *dev,
440 struct device_attribute *attr,
441 const char *buf, size_t count)
442{
443 struct tmp401_data *data = dev_get_drvdata(dev);
444 struct i2c_client *client = data->client;
445 unsigned long val;
446 int err, rate;
447
448 err = kstrtoul(buf, 10, &val);
449 if (err)
450 return err;
451
452 /*
453 * For valid rates, interval can be calculated as
454 * interval = (1 << (7 - rate)) * 125;
455 * Rounded rate is therefore
456 * rate = 7 - __fls(interval * 4 / (125 * 3));
457 * Use clamp_val() to avoid overflows, and to ensure valid input
458 * for __fls.
459 */
460 val = clamp_val(val, 125, 16000);
461 rate = 7 - __fls(val * 4 / (125 * 3));
462 mutex_lock(&data->update_lock);
463 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
464 data->update_interval = (1 << (7 - rate)) * 125;
465 mutex_unlock(&data->update_lock);
466
467 return count;
468}
469
470static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
471static SENSOR_DEVICE_ATTR_2(temp1_min, S_IWUSR | S_IRUGO, show_temp,
472 store_temp, 1, 0);
473static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp,
474 store_temp, 2, 0);
475static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
476 store_temp, 3, 0);
477static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
478 show_temp_crit_hyst, store_temp_crit_hyst, 0);
479static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_status, NULL,
480 1, TMP432_STATUS_LOCAL);
481static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_status, NULL,
482 2, TMP432_STATUS_LOCAL);
483static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_status, NULL,
484 3, TMP432_STATUS_LOCAL);
485static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
486static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp,
487 store_temp, 1, 1);
488static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp,
489 store_temp, 2, 1);
490static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IWUSR | S_IRUGO, show_temp,
491 store_temp, 3, 1);
492static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst,
493 NULL, 1);
494static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_status, NULL,
495 0, TMP432_STATUS_REMOTE1);
496static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_status, NULL,
497 1, TMP432_STATUS_REMOTE1);
498static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_status, NULL,
499 2, TMP432_STATUS_REMOTE1);
500static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_status, NULL,
501 3, TMP432_STATUS_REMOTE1);
502
503static DEVICE_ATTR_RW(update_interval);
504
505static struct attribute *tmp401_attributes[] = {
506 &sensor_dev_attr_temp1_input.dev_attr.attr,
507 &sensor_dev_attr_temp1_min.dev_attr.attr,
508 &sensor_dev_attr_temp1_max.dev_attr.attr,
509 &sensor_dev_attr_temp1_crit.dev_attr.attr,
510 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
511 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
512 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
513 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
514
515 &sensor_dev_attr_temp2_input.dev_attr.attr,
516 &sensor_dev_attr_temp2_min.dev_attr.attr,
517 &sensor_dev_attr_temp2_max.dev_attr.attr,
518 &sensor_dev_attr_temp2_crit.dev_attr.attr,
519 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
520 &sensor_dev_attr_temp2_fault.dev_attr.attr,
521 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
522 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
523 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
524
525 &dev_attr_update_interval.attr,
526
527 NULL
528};
529
530static const struct attribute_group tmp401_group = {
531 .attrs = tmp401_attributes,
532};
533
534/*
535 * Additional features of the TMP411 chip.
536 * The TMP411 stores the minimum and maximum
537 * temperature measured since power-on, chip-reset, or
538 * minimum and maximum register reset for both the local
539 * and remote channels.
540 */
541static SENSOR_DEVICE_ATTR_2(temp1_lowest, S_IRUGO, show_temp, NULL, 4, 0);
542static SENSOR_DEVICE_ATTR_2(temp1_highest, S_IRUGO, show_temp, NULL, 5, 0);
543static SENSOR_DEVICE_ATTR_2(temp2_lowest, S_IRUGO, show_temp, NULL, 4, 1);
544static SENSOR_DEVICE_ATTR_2(temp2_highest, S_IRUGO, show_temp, NULL, 5, 1);
545static SENSOR_DEVICE_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history,
546 0);
547
548static struct attribute *tmp411_attributes[] = {
549 &sensor_dev_attr_temp1_highest.dev_attr.attr,
550 &sensor_dev_attr_temp1_lowest.dev_attr.attr,
551 &sensor_dev_attr_temp2_highest.dev_attr.attr,
552 &sensor_dev_attr_temp2_lowest.dev_attr.attr,
553 &sensor_dev_attr_temp_reset_history.dev_attr.attr,
554 NULL
555};
556
557static const struct attribute_group tmp411_group = {
558 .attrs = tmp411_attributes,
559};
560
561static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0, 2);
562static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp,
563 store_temp, 1, 2);
564static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp,
565 store_temp, 2, 2);
566static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
567 store_temp, 3, 2);
568static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temp_crit_hyst,
569 NULL, 2);
570static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_status, NULL,
571 0, TMP432_STATUS_REMOTE2);
572static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_status, NULL,
573 1, TMP432_STATUS_REMOTE2);
574static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_status, NULL,
575 2, TMP432_STATUS_REMOTE2);
576static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_status, NULL,
577 3, TMP432_STATUS_REMOTE2);
578
579static struct attribute *tmp432_attributes[] = {
580 &sensor_dev_attr_temp3_input.dev_attr.attr,
581 &sensor_dev_attr_temp3_min.dev_attr.attr,
582 &sensor_dev_attr_temp3_max.dev_attr.attr,
583 &sensor_dev_attr_temp3_crit.dev_attr.attr,
584 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
585 &sensor_dev_attr_temp3_fault.dev_attr.attr,
586 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
587 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
588 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
589
590 NULL
591};
592
593static const struct attribute_group tmp432_group = {
594 .attrs = tmp432_attributes,
595};
596
597/*
598 * Additional features of the TMP461 chip.
599 * The TMP461 temperature offset for the remote channel.
600 */
601static SENSOR_DEVICE_ATTR_2(temp2_offset, S_IWUSR | S_IRUGO, show_temp,
602 store_temp, 6, 1);
603
604static struct attribute *tmp461_attributes[] = {
605 &sensor_dev_attr_temp2_offset.dev_attr.attr,
606 NULL
607};
608
609static const struct attribute_group tmp461_group = {
610 .attrs = tmp461_attributes,
611};
612
613/*
614 * Begin non sysfs callback code (aka Real code)
615 */
616
617static int tmp401_init_client(struct tmp401_data *data,
618 struct i2c_client *client)
619{
620 int config, config_orig, status = 0;
621
622 /* Set the conversion rate to 2 Hz */
623 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
624 data->update_interval = 500;
625
626 /* Start conversions (disable shutdown if necessary) */
627 config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
628 if (config < 0)
629 return config;
630
631 config_orig = config;
632 config &= ~TMP401_CONFIG_SHUTDOWN;
633
634 if (config != config_orig)
635 status = i2c_smbus_write_byte_data(client,
636 TMP401_CONFIG_WRITE,
637 config);
638
639 return status;
640}
641
642static int tmp401_detect(struct i2c_client *client,
643 struct i2c_board_info *info)
644{
645 enum chips kind;
646 struct i2c_adapter *adapter = client->adapter;
647 u8 reg;
648
649 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
650 return -ENODEV;
651
652 /* Detect and identify the chip */
653 reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
654 if (reg != TMP401_MANUFACTURER_ID)
655 return -ENODEV;
656
657 reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
658
659 switch (reg) {
660 case TMP401_DEVICE_ID:
661 if (client->addr != 0x4c)
662 return -ENODEV;
663 kind = tmp401;
664 break;
665 case TMP411A_DEVICE_ID:
666 if (client->addr != 0x4c)
667 return -ENODEV;
668 kind = tmp411;
669 break;
670 case TMP411B_DEVICE_ID:
671 if (client->addr != 0x4d)
672 return -ENODEV;
673 kind = tmp411;
674 break;
675 case TMP411C_DEVICE_ID:
676 if (client->addr != 0x4e)
677 return -ENODEV;
678 kind = tmp411;
679 break;
680 case TMP431_DEVICE_ID:
681 if (client->addr != 0x4c && client->addr != 0x4d)
682 return -ENODEV;
683 kind = tmp431;
684 break;
685 case TMP432_DEVICE_ID:
686 if (client->addr != 0x4c && client->addr != 0x4d)
687 return -ENODEV;
688 kind = tmp432;
689 break;
690 case TMP435_DEVICE_ID:
691 kind = tmp435;
692 break;
693 default:
694 return -ENODEV;
695 }
696
697 reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
698 if (reg & 0x1b)
699 return -ENODEV;
700
701 reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
702 /* Datasheet says: 0x1-0x6 */
703 if (reg > 15)
704 return -ENODEV;
705
706 strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
707
708 return 0;
709}
710
711static int tmp401_probe(struct i2c_client *client,
712 const struct i2c_device_id *id)
713{
714 static const char * const names[] = {
715 "TMP401", "TMP411", "TMP431", "TMP432", "TMP435", "TMP461"
716 };
717 struct device *dev = &client->dev;
718 struct device *hwmon_dev;
719 struct tmp401_data *data;
720 int groups = 0, status;
721
722 data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
723 if (!data)
724 return -ENOMEM;
725
726 data->client = client;
727 mutex_init(&data->update_lock);
728 data->kind = id->driver_data;
729
730 /* Initialize the TMP401 chip */
731 status = tmp401_init_client(data, client);
732 if (status < 0)
733 return status;
734
735 /* Register sysfs hooks */
736 data->groups[groups++] = &tmp401_group;
737
738 /* Register additional tmp411 sysfs hooks */
739 if (data->kind == tmp411)
740 data->groups[groups++] = &tmp411_group;
741
742 /* Register additional tmp432 sysfs hooks */
743 if (data->kind == tmp432)
744 data->groups[groups++] = &tmp432_group;
745
746 if (data->kind == tmp461)
747 data->groups[groups++] = &tmp461_group;
748
749 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
750 data, data->groups);
751 if (IS_ERR(hwmon_dev))
752 return PTR_ERR(hwmon_dev);
753
754 dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
755
756 return 0;
757}
758
759static struct i2c_driver tmp401_driver = {
760 .class = I2C_CLASS_HWMON,
761 .driver = {
762 .name = "tmp401",
763 },
764 .probe = tmp401_probe,
765 .id_table = tmp401_id,
766 .detect = tmp401_detect,
767 .address_list = normal_i2c,
768};
769
770module_i2c_driver(tmp401_driver);
771
772MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
773MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
774MODULE_LICENSE("GPL");