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 */
34 static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d,
35 0x4e, 0x4f, I2C_CLIENT_END };
36
37 enum 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
52 static 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
62 static 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
72 static 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
79 static 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 */
87 static 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
120 static 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 };
129 MODULE_DEVICE_TABLE(i2c, tmp401_id);
130
131 /*
132 * Client data (each client gets its own)
133 */
134
135 struct 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
tmp401_register_to_temp(u16 reg,u8 config)156 static 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
tmp401_temp_to_register(long temp,u8 config,int zbits)166 static 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
tmp401_update_device_reg16(struct i2c_client * client,struct tmp401_data * data)177 static 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
tmp401_update_device(struct device * dev)206 static 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
273 abort:
274 mutex_unlock(&data->update_lock);
275 return ret;
276 }
277
temp_show(struct device * dev,struct device_attribute * devattr,char * buf)278 static 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
temp_crit_hyst_show(struct device * dev,struct device_attribute * devattr,char * buf)292 static 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
status_show(struct device * dev,struct device_attribute * devattr,char * buf)310 static 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
temp_store(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)323 static 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
temp_crit_hyst_store(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)357 static 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 */
reset_temp_history_store(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)397 static 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
update_interval_show(struct device * dev,struct device_attribute * attr,char * buf)422 static 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
update_interval_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)430 static 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
461 static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, 0);
462 static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 1, 0);
463 static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 2, 0);
464 static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 3, 0);
465 static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, temp_crit_hyst, 0);
466 static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, status, 1,
467 TMP432_STATUS_LOCAL);
468 static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, status, 2,
469 TMP432_STATUS_LOCAL);
470 static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, status, 3,
471 TMP432_STATUS_LOCAL);
472 static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 0, 1);
473 static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 1, 1);
474 static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 2, 1);
475 static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 3, 1);
476 static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, temp_crit_hyst, 1);
477 static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, status, 0, TMP432_STATUS_REMOTE1);
478 static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, status, 1,
479 TMP432_STATUS_REMOTE1);
480 static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, status, 2,
481 TMP432_STATUS_REMOTE1);
482 static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, status, 3,
483 TMP432_STATUS_REMOTE1);
484
485 static DEVICE_ATTR_RW(update_interval);
486
487 static 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
512 static 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 */
523 static SENSOR_DEVICE_ATTR_2_RO(temp1_lowest, temp, 4, 0);
524 static SENSOR_DEVICE_ATTR_2_RO(temp1_highest, temp, 5, 0);
525 static SENSOR_DEVICE_ATTR_2_RO(temp2_lowest, temp, 4, 1);
526 static SENSOR_DEVICE_ATTR_2_RO(temp2_highest, temp, 5, 1);
527 static SENSOR_DEVICE_ATTR_WO(temp_reset_history, reset_temp_history, 0);
528
529 static 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
538 static const struct attribute_group tmp411_group = {
539 .attrs = tmp411_attributes,
540 };
541
542 static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 0, 2);
543 static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 1, 2);
544 static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, 2);
545 static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 3, 2);
546 static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, temp_crit_hyst, 2);
547 static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, status, 0, TMP432_STATUS_REMOTE2);
548 static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, status, 1,
549 TMP432_STATUS_REMOTE2);
550 static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, status, 2,
551 TMP432_STATUS_REMOTE2);
552 static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, status, 3,
553 TMP432_STATUS_REMOTE2);
554
555 static 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
569 static 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 */
577 static SENSOR_DEVICE_ATTR_2_RW(temp2_offset, temp, 6, 1);
578
579 static struct attribute *tmp461_attributes[] = {
580 &sensor_dev_attr_temp2_offset.dev_attr.attr,
581 NULL
582 };
583
584 static const struct attribute_group tmp461_group = {
585 .attrs = tmp461_attributes,
586 };
587
588 /*
589 * Begin non sysfs callback code (aka Real code)
590 */
591
tmp401_init_client(struct tmp401_data * data,struct i2c_client * client)592 static 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
tmp401_detect(struct i2c_client * client,struct i2c_board_info * info)617 static 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
tmp401_probe(struct i2c_client * client)686 static int tmp401_probe(struct i2c_client *client)
687 {
688 static const char * const names[] = {
689 "TMP401", "TMP411", "TMP431", "TMP432", "TMP435", "TMP461"
690 };
691 struct device *dev = &client->dev;
692 struct device *hwmon_dev;
693 struct tmp401_data *data;
694 int groups = 0, status;
695
696 data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
697 if (!data)
698 return -ENOMEM;
699
700 data->client = client;
701 mutex_init(&data->update_lock);
702 data->kind = i2c_match_id(tmp401_id, client)->driver_data;
703
704 /* Initialize the TMP401 chip */
705 status = tmp401_init_client(data, client);
706 if (status < 0)
707 return status;
708
709 /* Register sysfs hooks */
710 data->groups[groups++] = &tmp401_group;
711
712 /* Register additional tmp411 sysfs hooks */
713 if (data->kind == tmp411)
714 data->groups[groups++] = &tmp411_group;
715
716 /* Register additional tmp432 sysfs hooks */
717 if (data->kind == tmp432)
718 data->groups[groups++] = &tmp432_group;
719
720 if (data->kind == tmp461)
721 data->groups[groups++] = &tmp461_group;
722
723 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
724 data, data->groups);
725 if (IS_ERR(hwmon_dev))
726 return PTR_ERR(hwmon_dev);
727
728 dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
729
730 return 0;
731 }
732
733 static const struct of_device_id __maybe_unused tmp4xx_of_match[] = {
734 { .compatible = "ti,tmp401", },
735 { .compatible = "ti,tmp411", },
736 { .compatible = "ti,tmp431", },
737 { .compatible = "ti,tmp432", },
738 { .compatible = "ti,tmp435", },
739 { },
740 };
741 MODULE_DEVICE_TABLE(of, tmp4xx_of_match);
742
743 static struct i2c_driver tmp401_driver = {
744 .class = I2C_CLASS_HWMON,
745 .driver = {
746 .name = "tmp401",
747 .of_match_table = of_match_ptr(tmp4xx_of_match),
748 },
749 .probe_new = tmp401_probe,
750 .id_table = tmp401_id,
751 .detect = tmp401_detect,
752 .address_list = normal_i2c,
753 };
754
755 module_i2c_driver(tmp401_driver);
756
757 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
758 MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
759 MODULE_LICENSE("GPL");
760