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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/module.h>
22#include <linux/init.h>
23#include <linux/bitops.h>
24#include <linux/slab.h>
25#include <linux/jiffies.h>
26#include <linux/i2c.h>
27#include <linux/hwmon.h>
28#include <linux/hwmon-sysfs.h>
29#include <linux/err.h>
30#include <linux/mutex.h>
31#include <linux/sysfs.h>
32
33/* Addresses to scan */
34static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d,
35 0x4e, 0x4f, I2C_CLIENT_END };
36
37enum chips { tmp401, tmp411, tmp431, tmp432, tmp435, tmp461 };
38
39/*
40 * The TMP401 registers, note some registers have different addresses for
41 * reading and writing
42 */
43#define TMP401_STATUS 0x02
44#define TMP401_CONFIG_READ 0x03
45#define TMP401_CONFIG_WRITE 0x09
46#define TMP401_CONVERSION_RATE_READ 0x04
47#define TMP401_CONVERSION_RATE_WRITE 0x0A
48#define TMP401_TEMP_CRIT_HYST 0x21
49#define TMP401_MANUFACTURER_ID_REG 0xFE
50#define TMP401_DEVICE_ID_REG 0xFF
51
52static const u8 TMP401_TEMP_MSB_READ[7][2] = {
53 { 0x00, 0x01 }, /* temp */
54 { 0x06, 0x08 }, /* low limit */
55 { 0x05, 0x07 }, /* high limit */
56 { 0x20, 0x19 }, /* therm (crit) limit */
57 { 0x30, 0x34 }, /* lowest */
58 { 0x32, 0x36 }, /* highest */
59 { 0, 0x11 }, /* offset */
60};
61
62static const u8 TMP401_TEMP_MSB_WRITE[7][2] = {
63 { 0, 0 }, /* temp (unused) */
64 { 0x0C, 0x0E }, /* low limit */
65 { 0x0B, 0x0D }, /* high limit */
66 { 0x20, 0x19 }, /* therm (crit) limit */
67 { 0x30, 0x34 }, /* lowest */
68 { 0x32, 0x36 }, /* highest */
69 { 0, 0x11 }, /* offset */
70};
71
72static const u8 TMP432_TEMP_MSB_READ[4][3] = {
73 { 0x00, 0x01, 0x23 }, /* temp */
74 { 0x06, 0x08, 0x16 }, /* low limit */
75 { 0x05, 0x07, 0x15 }, /* high limit */
76 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
77};
78
79static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
80 { 0, 0, 0 }, /* temp - unused */
81 { 0x0C, 0x0E, 0x16 }, /* low limit */
82 { 0x0B, 0x0D, 0x15 }, /* high limit */
83 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
84};
85
86/* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
87static const u8 TMP432_STATUS_REG[] = {
88 0x1b, 0x36, 0x35, 0x37 };
89
90/* Flags */
91#define TMP401_CONFIG_RANGE BIT(2)
92#define TMP401_CONFIG_SHUTDOWN BIT(6)
93#define TMP401_STATUS_LOCAL_CRIT BIT(0)
94#define TMP401_STATUS_REMOTE_CRIT BIT(1)
95#define TMP401_STATUS_REMOTE_OPEN BIT(2)
96#define TMP401_STATUS_REMOTE_LOW BIT(3)
97#define TMP401_STATUS_REMOTE_HIGH BIT(4)
98#define TMP401_STATUS_LOCAL_LOW BIT(5)
99#define TMP401_STATUS_LOCAL_HIGH BIT(6)
100
101/* On TMP432, each status has its own register */
102#define TMP432_STATUS_LOCAL BIT(0)
103#define TMP432_STATUS_REMOTE1 BIT(1)
104#define TMP432_STATUS_REMOTE2 BIT(2)
105
106/* Manufacturer / Device ID's */
107#define TMP401_MANUFACTURER_ID 0x55
108#define TMP401_DEVICE_ID 0x11
109#define TMP411A_DEVICE_ID 0x12
110#define TMP411B_DEVICE_ID 0x13
111#define TMP411C_DEVICE_ID 0x10
112#define TMP431_DEVICE_ID 0x31
113#define TMP432_DEVICE_ID 0x32
114#define TMP435_DEVICE_ID 0x35
115
116/*
117 * Driver data (common to all clients)
118 */
119
120static const struct i2c_device_id tmp401_id[] = {
121 { "tmp401", tmp401 },
122 { "tmp411", tmp411 },
123 { "tmp431", tmp431 },
124 { "tmp432", tmp432 },
125 { "tmp435", tmp435 },
126 { "tmp461", tmp461 },
127 { }
128};
129MODULE_DEVICE_TABLE(i2c, tmp401_id);
130
131/*
132 * Client data (each client gets its own)
133 */
134
135struct tmp401_data {
136 struct i2c_client *client;
137 const struct attribute_group *groups[3];
138 struct mutex update_lock;
139 char valid; /* zero until following fields are valid */
140 unsigned long last_updated; /* in jiffies */
141 enum chips kind;
142
143 unsigned int update_interval; /* in milliseconds */
144
145 /* register values */
146 u8 status[4];
147 u8 config;
148 u16 temp[7][3];
149 u8 temp_crit_hyst;
150};
151
152/*
153 * Sysfs attr show / store functions
154 */
155
156static int tmp401_register_to_temp(u16 reg, u8 config)
157{
158 int temp = reg;
159
160 if (config & TMP401_CONFIG_RANGE)
161 temp -= 64 * 256;
162
163 return DIV_ROUND_CLOSEST(temp * 125, 32);
164}
165
166static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
167{
168 if (config & TMP401_CONFIG_RANGE) {
169 temp = clamp_val(temp, -64000, 191000);
170 temp += 64000;
171 } else
172 temp = clamp_val(temp, 0, 127000);
173
174 return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
175}
176
177static int tmp401_update_device_reg16(struct i2c_client *client,
178 struct tmp401_data *data)
179{
180 int i, j, val;
181 int num_regs = data->kind == tmp411 ? 6 : 4;
182 int num_sensors = data->kind == tmp432 ? 3 : 2;
183
184 for (i = 0; i < num_sensors; i++) { /* local / r1 / r2 */
185 for (j = 0; j < num_regs; j++) { /* temp / low / ... */
186 u8 regaddr;
187
188 regaddr = data->kind == tmp432 ?
189 TMP432_TEMP_MSB_READ[j][i] :
190 TMP401_TEMP_MSB_READ[j][i];
191 if (j == 3) { /* crit is msb only */
192 val = i2c_smbus_read_byte_data(client, regaddr);
193 } else {
194 val = i2c_smbus_read_word_swapped(client,
195 regaddr);
196 }
197 if (val < 0)
198 return val;
199
200 data->temp[j][i] = j == 3 ? val << 8 : val;
201 }
202 }
203 return 0;
204}
205
206static struct tmp401_data *tmp401_update_device(struct device *dev)
207{
208 struct tmp401_data *data = dev_get_drvdata(dev);
209 struct i2c_client *client = data->client;
210 struct tmp401_data *ret = data;
211 int i, val;
212 unsigned long next_update;
213
214 mutex_lock(&data->update_lock);
215
216 next_update = data->last_updated +
217 msecs_to_jiffies(data->update_interval);
218 if (time_after(jiffies, next_update) || !data->valid) {
219 if (data->kind != tmp432) {
220 /*
221 * The driver uses the TMP432 status format internally.
222 * Convert status to TMP432 format for other chips.
223 */
224 val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
225 if (val < 0) {
226 ret = ERR_PTR(val);
227 goto abort;
228 }
229 data->status[0] =
230 (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
231 data->status[1] =
232 ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
233 ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
234 data->status[2] =
235 ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
236 ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
237 data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
238 | TMP401_STATUS_REMOTE_CRIT);
239 } else {
240 for (i = 0; i < ARRAY_SIZE(data->status); i++) {
241 val = i2c_smbus_read_byte_data(client,
242 TMP432_STATUS_REG[i]);
243 if (val < 0) {
244 ret = ERR_PTR(val);
245 goto abort;
246 }
247 data->status[i] = val;
248 }
249 }
250
251 val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
252 if (val < 0) {
253 ret = ERR_PTR(val);
254 goto abort;
255 }
256 data->config = val;
257 val = tmp401_update_device_reg16(client, data);
258 if (val < 0) {
259 ret = ERR_PTR(val);
260 goto abort;
261 }
262 val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
263 if (val < 0) {
264 ret = ERR_PTR(val);
265 goto abort;
266 }
267 data->temp_crit_hyst = val;
268
269 data->last_updated = jiffies;
270 data->valid = 1;
271 }
272
273abort:
274 mutex_unlock(&data->update_lock);
275 return ret;
276}
277
278static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
279 char *buf)
280{
281 int nr = to_sensor_dev_attr_2(devattr)->nr;
282 int index = to_sensor_dev_attr_2(devattr)->index;
283 struct tmp401_data *data = tmp401_update_device(dev);
284
285 if (IS_ERR(data))
286 return PTR_ERR(data);
287
288 return sprintf(buf, "%d\n",
289 tmp401_register_to_temp(data->temp[nr][index], data->config));
290}
291
292static ssize_t temp_crit_hyst_show(struct device *dev,
293 struct device_attribute *devattr,
294 char *buf)
295{
296 int temp, index = to_sensor_dev_attr(devattr)->index;
297 struct tmp401_data *data = tmp401_update_device(dev);
298
299 if (IS_ERR(data))
300 return PTR_ERR(data);
301
302 mutex_lock(&data->update_lock);
303 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
304 temp -= data->temp_crit_hyst * 1000;
305 mutex_unlock(&data->update_lock);
306
307 return sprintf(buf, "%d\n", temp);
308}
309
310static ssize_t status_show(struct device *dev,
311 struct device_attribute *devattr, char *buf)
312{
313 int nr = to_sensor_dev_attr_2(devattr)->nr;
314 int mask = to_sensor_dev_attr_2(devattr)->index;
315 struct tmp401_data *data = tmp401_update_device(dev);
316
317 if (IS_ERR(data))
318 return PTR_ERR(data);
319
320 return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
321}
322
323static ssize_t temp_store(struct device *dev,
324 struct device_attribute *devattr, const char *buf,
325 size_t count)
326{
327 int nr = to_sensor_dev_attr_2(devattr)->nr;
328 int index = to_sensor_dev_attr_2(devattr)->index;
329 struct tmp401_data *data = dev_get_drvdata(dev);
330 struct i2c_client *client = data->client;
331 long val;
332 u16 reg;
333 u8 regaddr;
334
335 if (kstrtol(buf, 10, &val))
336 return -EINVAL;
337
338 reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
339
340 mutex_lock(&data->update_lock);
341
342 regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
343 : TMP401_TEMP_MSB_WRITE[nr][index];
344 if (nr == 3) { /* crit is msb only */
345 i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
346 } else {
347 /* Hardware expects big endian data --> use _swapped */
348 i2c_smbus_write_word_swapped(client, regaddr, reg);
349 }
350 data->temp[nr][index] = reg;
351
352 mutex_unlock(&data->update_lock);
353
354 return count;
355}
356
357static ssize_t temp_crit_hyst_store(struct device *dev,
358 struct device_attribute *devattr,
359 const char *buf, size_t count)
360{
361 int temp, index = to_sensor_dev_attr(devattr)->index;
362 struct tmp401_data *data = tmp401_update_device(dev);
363 long val;
364 u8 reg;
365
366 if (IS_ERR(data))
367 return PTR_ERR(data);
368
369 if (kstrtol(buf, 10, &val))
370 return -EINVAL;
371
372 if (data->config & TMP401_CONFIG_RANGE)
373 val = clamp_val(val, -64000, 191000);
374 else
375 val = clamp_val(val, 0, 127000);
376
377 mutex_lock(&data->update_lock);
378 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
379 val = clamp_val(val, temp - 255000, temp);
380 reg = ((temp - val) + 500) / 1000;
381
382 i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
383 reg);
384
385 data->temp_crit_hyst = reg;
386
387 mutex_unlock(&data->update_lock);
388
389 return count;
390}
391
392/*
393 * Resets the historical measurements of minimum and maximum temperatures.
394 * This is done by writing any value to any of the minimum/maximum registers
395 * (0x30-0x37).
396 */
397static ssize_t reset_temp_history_store(struct device *dev,
398 struct device_attribute *devattr,
399 const char *buf, size_t count)
400{
401 struct tmp401_data *data = dev_get_drvdata(dev);
402 struct i2c_client *client = data->client;
403 long val;
404
405 if (kstrtol(buf, 10, &val))
406 return -EINVAL;
407
408 if (val != 1) {
409 dev_err(dev,
410 "temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
411 val);
412 return -EINVAL;
413 }
414 mutex_lock(&data->update_lock);
415 i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
416 data->valid = 0;
417 mutex_unlock(&data->update_lock);
418
419 return count;
420}
421
422static ssize_t update_interval_show(struct device *dev,
423 struct device_attribute *attr, char *buf)
424{
425 struct tmp401_data *data = dev_get_drvdata(dev);
426
427 return sprintf(buf, "%u\n", data->update_interval);
428}
429
430static ssize_t update_interval_store(struct device *dev,
431 struct device_attribute *attr,
432 const char *buf, size_t count)
433{
434 struct tmp401_data *data = dev_get_drvdata(dev);
435 struct i2c_client *client = data->client;
436 unsigned long val;
437 int err, rate;
438
439 err = kstrtoul(buf, 10, &val);
440 if (err)
441 return err;
442
443 /*
444 * For valid rates, interval can be calculated as
445 * interval = (1 << (7 - rate)) * 125;
446 * Rounded rate is therefore
447 * rate = 7 - __fls(interval * 4 / (125 * 3));
448 * Use clamp_val() to avoid overflows, and to ensure valid input
449 * for __fls.
450 */
451 val = clamp_val(val, 125, 16000);
452 rate = 7 - __fls(val * 4 / (125 * 3));
453 mutex_lock(&data->update_lock);
454 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
455 data->update_interval = (1 << (7 - rate)) * 125;
456 mutex_unlock(&data->update_lock);
457
458 return count;
459}
460
461static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, 0);
462static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 1, 0);
463static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 2, 0);
464static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 3, 0);
465static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, temp_crit_hyst, 0);
466static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, status, 1,
467 TMP432_STATUS_LOCAL);
468static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, status, 2,
469 TMP432_STATUS_LOCAL);
470static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, status, 3,
471 TMP432_STATUS_LOCAL);
472static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 0, 1);
473static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 1, 1);
474static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 2, 1);
475static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 3, 1);
476static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, temp_crit_hyst, 1);
477static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, status, 0, TMP432_STATUS_REMOTE1);
478static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, status, 1,
479 TMP432_STATUS_REMOTE1);
480static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, status, 2,
481 TMP432_STATUS_REMOTE1);
482static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, status, 3,
483 TMP432_STATUS_REMOTE1);
484
485static DEVICE_ATTR_RW(update_interval);
486
487static struct attribute *tmp401_attributes[] = {
488 &sensor_dev_attr_temp1_input.dev_attr.attr,
489 &sensor_dev_attr_temp1_min.dev_attr.attr,
490 &sensor_dev_attr_temp1_max.dev_attr.attr,
491 &sensor_dev_attr_temp1_crit.dev_attr.attr,
492 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
493 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
494 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
495 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
496
497 &sensor_dev_attr_temp2_input.dev_attr.attr,
498 &sensor_dev_attr_temp2_min.dev_attr.attr,
499 &sensor_dev_attr_temp2_max.dev_attr.attr,
500 &sensor_dev_attr_temp2_crit.dev_attr.attr,
501 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
502 &sensor_dev_attr_temp2_fault.dev_attr.attr,
503 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
504 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
505 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
506
507 &dev_attr_update_interval.attr,
508
509 NULL
510};
511
512static const struct attribute_group tmp401_group = {
513 .attrs = tmp401_attributes,
514};
515
516/*
517 * Additional features of the TMP411 chip.
518 * The TMP411 stores the minimum and maximum
519 * temperature measured since power-on, chip-reset, or
520 * minimum and maximum register reset for both the local
521 * and remote channels.
522 */
523static SENSOR_DEVICE_ATTR_2_RO(temp1_lowest, temp, 4, 0);
524static SENSOR_DEVICE_ATTR_2_RO(temp1_highest, temp, 5, 0);
525static SENSOR_DEVICE_ATTR_2_RO(temp2_lowest, temp, 4, 1);
526static SENSOR_DEVICE_ATTR_2_RO(temp2_highest, temp, 5, 1);
527static SENSOR_DEVICE_ATTR_WO(temp_reset_history, reset_temp_history, 0);
528
529static struct attribute *tmp411_attributes[] = {
530 &sensor_dev_attr_temp1_highest.dev_attr.attr,
531 &sensor_dev_attr_temp1_lowest.dev_attr.attr,
532 &sensor_dev_attr_temp2_highest.dev_attr.attr,
533 &sensor_dev_attr_temp2_lowest.dev_attr.attr,
534 &sensor_dev_attr_temp_reset_history.dev_attr.attr,
535 NULL
536};
537
538static const struct attribute_group tmp411_group = {
539 .attrs = tmp411_attributes,
540};
541
542static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 0, 2);
543static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 1, 2);
544static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, 2);
545static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 3, 2);
546static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, temp_crit_hyst, 2);
547static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, status, 0, TMP432_STATUS_REMOTE2);
548static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, status, 1,
549 TMP432_STATUS_REMOTE2);
550static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, status, 2,
551 TMP432_STATUS_REMOTE2);
552static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, status, 3,
553 TMP432_STATUS_REMOTE2);
554
555static struct attribute *tmp432_attributes[] = {
556 &sensor_dev_attr_temp3_input.dev_attr.attr,
557 &sensor_dev_attr_temp3_min.dev_attr.attr,
558 &sensor_dev_attr_temp3_max.dev_attr.attr,
559 &sensor_dev_attr_temp3_crit.dev_attr.attr,
560 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
561 &sensor_dev_attr_temp3_fault.dev_attr.attr,
562 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
563 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
564 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
565
566 NULL
567};
568
569static const struct attribute_group tmp432_group = {
570 .attrs = tmp432_attributes,
571};
572
573/*
574 * Additional features of the TMP461 chip.
575 * The TMP461 temperature offset for the remote channel.
576 */
577static SENSOR_DEVICE_ATTR_2_RW(temp2_offset, temp, 6, 1);
578
579static struct attribute *tmp461_attributes[] = {
580 &sensor_dev_attr_temp2_offset.dev_attr.attr,
581 NULL
582};
583
584static const struct attribute_group tmp461_group = {
585 .attrs = tmp461_attributes,
586};
587
588/*
589 * Begin non sysfs callback code (aka Real code)
590 */
591
592static int tmp401_init_client(struct tmp401_data *data,
593 struct i2c_client *client)
594{
595 int config, config_orig, status = 0;
596
597 /* Set the conversion rate to 2 Hz */
598 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
599 data->update_interval = 500;
600
601 /* Start conversions (disable shutdown if necessary) */
602 config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
603 if (config < 0)
604 return config;
605
606 config_orig = config;
607 config &= ~TMP401_CONFIG_SHUTDOWN;
608
609 if (config != config_orig)
610 status = i2c_smbus_write_byte_data(client,
611 TMP401_CONFIG_WRITE,
612 config);
613
614 return status;
615}
616
617static int tmp401_detect(struct i2c_client *client,
618 struct i2c_board_info *info)
619{
620 enum chips kind;
621 struct i2c_adapter *adapter = client->adapter;
622 u8 reg;
623
624 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
625 return -ENODEV;
626
627 /* Detect and identify the chip */
628 reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
629 if (reg != TMP401_MANUFACTURER_ID)
630 return -ENODEV;
631
632 reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
633
634 switch (reg) {
635 case TMP401_DEVICE_ID:
636 if (client->addr != 0x4c)
637 return -ENODEV;
638 kind = tmp401;
639 break;
640 case TMP411A_DEVICE_ID:
641 if (client->addr != 0x4c)
642 return -ENODEV;
643 kind = tmp411;
644 break;
645 case TMP411B_DEVICE_ID:
646 if (client->addr != 0x4d)
647 return -ENODEV;
648 kind = tmp411;
649 break;
650 case TMP411C_DEVICE_ID:
651 if (client->addr != 0x4e)
652 return -ENODEV;
653 kind = tmp411;
654 break;
655 case TMP431_DEVICE_ID:
656 if (client->addr != 0x4c && client->addr != 0x4d)
657 return -ENODEV;
658 kind = tmp431;
659 break;
660 case TMP432_DEVICE_ID:
661 if (client->addr != 0x4c && client->addr != 0x4d)
662 return -ENODEV;
663 kind = tmp432;
664 break;
665 case TMP435_DEVICE_ID:
666 kind = tmp435;
667 break;
668 default:
669 return -ENODEV;
670 }
671
672 reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
673 if (reg & 0x1b)
674 return -ENODEV;
675
676 reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
677 /* Datasheet says: 0x1-0x6 */
678 if (reg > 15)
679 return -ENODEV;
680
681 strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
682
683 return 0;
684}
685
686static int tmp401_probe(struct i2c_client *client,
687 const struct i2c_device_id *id)
688{
689 static const char * const names[] = {
690 "TMP401", "TMP411", "TMP431", "TMP432", "TMP435", "TMP461"
691 };
692 struct device *dev = &client->dev;
693 struct device *hwmon_dev;
694 struct tmp401_data *data;
695 int groups = 0, status;
696
697 data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
698 if (!data)
699 return -ENOMEM;
700
701 data->client = client;
702 mutex_init(&data->update_lock);
703 data->kind = id->driver_data;
704
705 /* Initialize the TMP401 chip */
706 status = tmp401_init_client(data, client);
707 if (status < 0)
708 return status;
709
710 /* Register sysfs hooks */
711 data->groups[groups++] = &tmp401_group;
712
713 /* Register additional tmp411 sysfs hooks */
714 if (data->kind == tmp411)
715 data->groups[groups++] = &tmp411_group;
716
717 /* Register additional tmp432 sysfs hooks */
718 if (data->kind == tmp432)
719 data->groups[groups++] = &tmp432_group;
720
721 if (data->kind == tmp461)
722 data->groups[groups++] = &tmp461_group;
723
724 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
725 data, data->groups);
726 if (IS_ERR(hwmon_dev))
727 return PTR_ERR(hwmon_dev);
728
729 dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
730
731 return 0;
732}
733
734static struct i2c_driver tmp401_driver = {
735 .class = I2C_CLASS_HWMON,
736 .driver = {
737 .name = "tmp401",
738 },
739 .probe = tmp401_probe,
740 .id_table = tmp401_id,
741 .detect = tmp401_detect,
742 .address_list = normal_i2c,
743};
744
745module_i2c_driver(tmp401_driver);
746
747MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
748MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
749MODULE_LICENSE("GPL");
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_MAPLE,
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 regs[2] = { TMP401_TEMP_MSB[3][channel], TMP401_TEMP_CRIT_HYST };
312 unsigned int regval;
313 u16 regvals[2];
314 int reg, ret;
315
316 switch (attr) {
317 case hwmon_temp_input:
318 case hwmon_temp_min:
319 case hwmon_temp_max:
320 case hwmon_temp_crit:
321 case hwmon_temp_lowest:
322 case hwmon_temp_highest:
323 reg = TMP401_TEMP_MSB[tmp401_temp_reg_index[attr]][channel];
324 ret = regmap_read(regmap, reg, ®val);
325 if (ret < 0)
326 return ret;
327 *val = tmp401_register_to_temp(regval, data->extended_range);
328 break;
329 case hwmon_temp_crit_hyst:
330 ret = regmap_multi_reg_read(regmap, regs, regvals, 2);
331 if (ret < 0)
332 return ret;
333 *val = tmp401_register_to_temp(regvals[0], data->extended_range) -
334 (regvals[1] * 1000);
335 break;
336 case hwmon_temp_fault:
337 case hwmon_temp_min_alarm:
338 case hwmon_temp_max_alarm:
339 case hwmon_temp_crit_alarm:
340 reg = TMP432_STATUS_REG[tmp401_status_reg_index[attr]];
341 ret = regmap_read(regmap, reg, ®val);
342 if (ret < 0)
343 return ret;
344 *val = !!(regval & BIT(channel));
345 break;
346 default:
347 return -EOPNOTSUPP;
348 }
349 return 0;
350}
351
352static int tmp401_temp_write(struct device *dev, u32 attr, int channel,
353 long val)
354{
355 struct tmp401_data *data = dev_get_drvdata(dev);
356 struct regmap *regmap = data->regmap;
357 unsigned int regval;
358 int reg, ret, temp;
359
360 mutex_lock(&data->update_lock);
361 switch (attr) {
362 case hwmon_temp_min:
363 case hwmon_temp_max:
364 case hwmon_temp_crit:
365 reg = TMP401_TEMP_MSB[tmp401_temp_reg_index[attr]][channel];
366 regval = tmp401_temp_to_register(val, data->extended_range,
367 attr == hwmon_temp_crit ? 8 : 4);
368 ret = regmap_write(regmap, reg, regval);
369 break;
370 case hwmon_temp_crit_hyst:
371 if (data->extended_range)
372 val = clamp_val(val, -64000, 191000);
373 else
374 val = clamp_val(val, 0, 127000);
375
376 reg = TMP401_TEMP_MSB[3][channel];
377 ret = regmap_read(regmap, reg, ®val);
378 if (ret < 0)
379 break;
380 temp = tmp401_register_to_temp(regval, data->extended_range);
381 val = clamp_val(val, temp - 255000, temp);
382 regval = ((temp - val) + 500) / 1000;
383 ret = regmap_write(regmap, TMP401_TEMP_CRIT_HYST, regval);
384 break;
385 default:
386 ret = -EOPNOTSUPP;
387 break;
388 }
389 mutex_unlock(&data->update_lock);
390 return ret;
391}
392
393static int tmp401_chip_read(struct device *dev, u32 attr, int channel, long *val)
394{
395 struct tmp401_data *data = dev_get_drvdata(dev);
396 u32 regval;
397 int ret;
398
399 switch (attr) {
400 case hwmon_chip_update_interval:
401 ret = regmap_read(data->regmap, TMP401_CONVERSION_RATE, ®val);
402 if (ret < 0)
403 return ret;
404 *val = (1 << (7 - regval)) * 125;
405 break;
406 case hwmon_chip_temp_reset_history:
407 *val = 0;
408 break;
409 default:
410 return -EOPNOTSUPP;
411 }
412
413 return 0;
414}
415
416static int tmp401_set_convrate(struct regmap *regmap, long val)
417{
418 int rate;
419
420 /*
421 * For valid rates, interval can be calculated as
422 * interval = (1 << (7 - rate)) * 125;
423 * Rounded rate is therefore
424 * rate = 7 - __fls(interval * 4 / (125 * 3));
425 * Use clamp_val() to avoid overflows, and to ensure valid input
426 * for __fls.
427 */
428 val = clamp_val(val, 125, 16000);
429 rate = 7 - __fls(val * 4 / (125 * 3));
430 return regmap_write(regmap, TMP401_CONVERSION_RATE, rate);
431}
432
433static int tmp401_chip_write(struct device *dev, u32 attr, int channel, long val)
434{
435 struct tmp401_data *data = dev_get_drvdata(dev);
436 struct regmap *regmap = data->regmap;
437 int err;
438
439 mutex_lock(&data->update_lock);
440 switch (attr) {
441 case hwmon_chip_update_interval:
442 err = tmp401_set_convrate(regmap, val);
443 break;
444 case hwmon_chip_temp_reset_history:
445 if (val != 1) {
446 err = -EINVAL;
447 break;
448 }
449 /*
450 * Reset history by writing any value to any of the
451 * minimum/maximum registers (0x30-0x37).
452 */
453 err = regmap_write(regmap, 0x30, 0);
454 break;
455 default:
456 err = -EOPNOTSUPP;
457 break;
458 }
459 mutex_unlock(&data->update_lock);
460
461 return err;
462}
463
464static int tmp401_read(struct device *dev, enum hwmon_sensor_types type,
465 u32 attr, int channel, long *val)
466{
467 switch (type) {
468 case hwmon_chip:
469 return tmp401_chip_read(dev, attr, channel, val);
470 case hwmon_temp:
471 return tmp401_temp_read(dev, attr, channel, val);
472 default:
473 return -EOPNOTSUPP;
474 }
475}
476
477static int tmp401_write(struct device *dev, enum hwmon_sensor_types type,
478 u32 attr, int channel, long val)
479{
480 switch (type) {
481 case hwmon_chip:
482 return tmp401_chip_write(dev, attr, channel, val);
483 case hwmon_temp:
484 return tmp401_temp_write(dev, attr, channel, val);
485 default:
486 return -EOPNOTSUPP;
487 }
488}
489
490static umode_t tmp401_is_visible(const void *data, enum hwmon_sensor_types type,
491 u32 attr, int channel)
492{
493 switch (type) {
494 case hwmon_chip:
495 switch (attr) {
496 case hwmon_chip_update_interval:
497 case hwmon_chip_temp_reset_history:
498 return 0644;
499 default:
500 break;
501 }
502 break;
503 case hwmon_temp:
504 switch (attr) {
505 case hwmon_temp_input:
506 case hwmon_temp_min_alarm:
507 case hwmon_temp_max_alarm:
508 case hwmon_temp_crit_alarm:
509 case hwmon_temp_fault:
510 case hwmon_temp_lowest:
511 case hwmon_temp_highest:
512 return 0444;
513 case hwmon_temp_min:
514 case hwmon_temp_max:
515 case hwmon_temp_crit:
516 case hwmon_temp_crit_hyst:
517 return 0644;
518 default:
519 break;
520 }
521 break;
522 default:
523 break;
524 }
525 return 0;
526}
527
528static const struct hwmon_ops tmp401_ops = {
529 .is_visible = tmp401_is_visible,
530 .read = tmp401_read,
531 .write = tmp401_write,
532};
533
534/* chip initialization, detect, probe */
535
536static int tmp401_init_client(struct tmp401_data *data)
537{
538 struct regmap *regmap = data->regmap;
539 u32 config, config_orig;
540 int ret;
541 u32 val = 0;
542 s32 nfactor = 0;
543
544 /* Set conversion rate to 2 Hz */
545 ret = regmap_write(regmap, TMP401_CONVERSION_RATE, 5);
546 if (ret < 0)
547 return ret;
548
549 /* Start conversions (disable shutdown if necessary) */
550 ret = regmap_read(regmap, TMP401_CONFIG, &config);
551 if (ret < 0)
552 return ret;
553
554 config_orig = config;
555 config &= ~TMP401_CONFIG_SHUTDOWN;
556
557 if (of_property_read_bool(data->client->dev.of_node, "ti,extended-range-enable")) {
558 /* Enable measurement over extended temperature range */
559 config |= TMP401_CONFIG_RANGE;
560 }
561
562 data->extended_range = !!(config & TMP401_CONFIG_RANGE);
563
564 if (config != config_orig) {
565 ret = regmap_write(regmap, TMP401_CONFIG, config);
566 if (ret < 0)
567 return ret;
568 }
569
570 ret = of_property_read_u32(data->client->dev.of_node, "ti,n-factor", &nfactor);
571 if (!ret) {
572 if (data->kind == tmp401) {
573 dev_err(&data->client->dev, "ti,tmp401 does not support n-factor correction\n");
574 return -EINVAL;
575 }
576 if (nfactor < -128 || nfactor > 127) {
577 dev_err(&data->client->dev, "n-factor is invalid (%d)\n", nfactor);
578 return -EINVAL;
579 }
580 ret = regmap_write(regmap, TMP4XX_N_FACTOR_REG, (unsigned int)nfactor);
581 if (ret < 0)
582 return ret;
583 }
584
585 ret = of_property_read_u32(data->client->dev.of_node, "ti,beta-compensation", &val);
586 if (!ret) {
587 if (data->kind == tmp401 || data->kind == tmp411) {
588 dev_err(&data->client->dev, "ti,tmp401 or ti,tmp411 does not support beta compensation\n");
589 return -EINVAL;
590 }
591 if (val > 15) {
592 dev_err(&data->client->dev, "beta-compensation is invalid (%u)\n", val);
593 return -EINVAL;
594 }
595 ret = regmap_write(regmap, TMP43X_BETA_RANGE, val);
596 if (ret < 0)
597 return ret;
598 }
599
600 return 0;
601}
602
603static int tmp401_detect(struct i2c_client *client,
604 struct i2c_board_info *info)
605{
606 enum chips kind;
607 struct i2c_adapter *adapter = client->adapter;
608 u8 reg;
609
610 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
611 return -ENODEV;
612
613 /* Detect and identify the chip */
614 reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
615 if (reg != TMP401_MANUFACTURER_ID)
616 return -ENODEV;
617
618 reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
619
620 switch (reg) {
621 case TMP401_DEVICE_ID:
622 if (client->addr != 0x4c)
623 return -ENODEV;
624 kind = tmp401;
625 break;
626 case TMP411A_DEVICE_ID:
627 if (client->addr != 0x4c)
628 return -ENODEV;
629 kind = tmp411;
630 break;
631 case TMP411B_DEVICE_ID:
632 if (client->addr != 0x4d)
633 return -ENODEV;
634 kind = tmp411;
635 break;
636 case TMP411C_DEVICE_ID:
637 if (client->addr != 0x4e)
638 return -ENODEV;
639 kind = tmp411;
640 break;
641 case TMP431_DEVICE_ID:
642 if (client->addr != 0x4c && client->addr != 0x4d)
643 return -ENODEV;
644 kind = tmp431;
645 break;
646 case TMP432_DEVICE_ID:
647 if (client->addr != 0x4c && client->addr != 0x4d)
648 return -ENODEV;
649 kind = tmp432;
650 break;
651 case TMP435_DEVICE_ID:
652 kind = tmp435;
653 break;
654 default:
655 return -ENODEV;
656 }
657
658 reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG);
659 if (reg & 0x1b)
660 return -ENODEV;
661
662 reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE);
663 /* Datasheet says: 0x1-0x6 */
664 if (reg > 15)
665 return -ENODEV;
666
667 strscpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
668
669 return 0;
670}
671
672static int tmp401_probe(struct i2c_client *client)
673{
674 static const char * const names[] = {
675 "TMP401", "TMP411", "TMP431", "TMP432", "TMP435"
676 };
677 struct device *dev = &client->dev;
678 struct hwmon_channel_info *info;
679 struct device *hwmon_dev;
680 struct tmp401_data *data;
681 int status;
682
683 data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
684 if (!data)
685 return -ENOMEM;
686
687 data->client = client;
688 mutex_init(&data->update_lock);
689 data->kind = (uintptr_t)i2c_get_match_data(client);
690
691 data->regmap = devm_regmap_init(dev, NULL, data, &tmp401_regmap_config);
692 if (IS_ERR(data->regmap))
693 return PTR_ERR(data->regmap);
694
695 /* initialize configuration data */
696 data->chip.ops = &tmp401_ops;
697 data->chip.info = data->info;
698
699 data->info[0] = &data->chip_info;
700 data->info[1] = &data->temp_info;
701
702 info = &data->chip_info;
703 info->type = hwmon_chip;
704 info->config = data->chip_channel_config;
705
706 data->chip_channel_config[0] = HWMON_C_UPDATE_INTERVAL;
707
708 info = &data->temp_info;
709 info->type = hwmon_temp;
710 info->config = data->temp_channel_config;
711
712 data->temp_channel_config[0] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
713 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
714 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM;
715 data->temp_channel_config[1] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
716 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
717 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT;
718
719 if (data->kind == tmp411) {
720 data->temp_channel_config[0] |= HWMON_T_HIGHEST | HWMON_T_LOWEST;
721 data->temp_channel_config[1] |= HWMON_T_HIGHEST | HWMON_T_LOWEST;
722 data->chip_channel_config[0] |= HWMON_C_TEMP_RESET_HISTORY;
723 }
724
725 if (data->kind == tmp432) {
726 data->temp_channel_config[2] = HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
727 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |
728 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT;
729 }
730
731 /* Initialize the TMP401 chip */
732 status = tmp401_init_client(data);
733 if (status < 0)
734 return status;
735
736 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
737 &data->chip, NULL);
738 if (IS_ERR(hwmon_dev))
739 return PTR_ERR(hwmon_dev);
740
741 dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
742
743 return 0;
744}
745
746static const struct of_device_id __maybe_unused tmp4xx_of_match[] = {
747 { .compatible = "ti,tmp401", },
748 { .compatible = "ti,tmp411", },
749 { .compatible = "ti,tmp431", },
750 { .compatible = "ti,tmp432", },
751 { .compatible = "ti,tmp435", },
752 { },
753};
754MODULE_DEVICE_TABLE(of, tmp4xx_of_match);
755
756static struct i2c_driver tmp401_driver = {
757 .class = I2C_CLASS_HWMON,
758 .driver = {
759 .name = "tmp401",
760 .of_match_table = of_match_ptr(tmp4xx_of_match),
761 },
762 .probe = tmp401_probe,
763 .id_table = tmp401_id,
764 .detect = tmp401_detect,
765 .address_list = normal_i2c,
766};
767
768module_i2c_driver(tmp401_driver);
769
770MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
771MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
772MODULE_LICENSE("GPL");