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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/* 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[] = { 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
48
49enum chips { tmp401, tmp411, tmp431, tmp432 };
50
51/*
52 * The TMP401 registers, note some registers have different addresses for
53 * reading and writing
54 */
55#define TMP401_STATUS 0x02
56#define TMP401_CONFIG_READ 0x03
57#define TMP401_CONFIG_WRITE 0x09
58#define TMP401_CONVERSION_RATE_READ 0x04
59#define TMP401_CONVERSION_RATE_WRITE 0x0A
60#define TMP401_TEMP_CRIT_HYST 0x21
61#define TMP401_MANUFACTURER_ID_REG 0xFE
62#define TMP401_DEVICE_ID_REG 0xFF
63
64static const u8 TMP401_TEMP_MSB_READ[6][2] = {
65 { 0x00, 0x01 }, /* temp */
66 { 0x06, 0x08 }, /* low limit */
67 { 0x05, 0x07 }, /* high limit */
68 { 0x20, 0x19 }, /* therm (crit) limit */
69 { 0x30, 0x34 }, /* lowest */
70 { 0x32, 0x36 }, /* highest */
71};
72
73static const u8 TMP401_TEMP_MSB_WRITE[6][2] = {
74 { 0, 0 }, /* temp (unused) */
75 { 0x0C, 0x0E }, /* low limit */
76 { 0x0B, 0x0D }, /* high limit */
77 { 0x20, 0x19 }, /* therm (crit) limit */
78 { 0x30, 0x34 }, /* lowest */
79 { 0x32, 0x36 }, /* highest */
80};
81
82static const u8 TMP401_TEMP_LSB[6][2] = {
83 { 0x15, 0x10 }, /* temp */
84 { 0x17, 0x14 }, /* low limit */
85 { 0x16, 0x13 }, /* high limit */
86 { 0, 0 }, /* therm (crit) limit (unused) */
87 { 0x31, 0x35 }, /* lowest */
88 { 0x33, 0x37 }, /* highest */
89};
90
91static const u8 TMP432_TEMP_MSB_READ[4][3] = {
92 { 0x00, 0x01, 0x23 }, /* temp */
93 { 0x06, 0x08, 0x16 }, /* low limit */
94 { 0x05, 0x07, 0x15 }, /* high limit */
95 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
96};
97
98static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
99 { 0, 0, 0 }, /* temp - unused */
100 { 0x0C, 0x0E, 0x16 }, /* low limit */
101 { 0x0B, 0x0D, 0x15 }, /* high limit */
102 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
103};
104
105static const u8 TMP432_TEMP_LSB[3][3] = {
106 { 0x29, 0x10, 0x24 }, /* temp */
107 { 0x3E, 0x14, 0x18 }, /* low limit */
108 { 0x3D, 0x13, 0x17 }, /* high limit */
109};
110
111/* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
112static const u8 TMP432_STATUS_REG[] = {
113 0x1b, 0x36, 0x35, 0x37 };
114
115/* Flags */
116#define TMP401_CONFIG_RANGE BIT(2)
117#define TMP401_CONFIG_SHUTDOWN BIT(6)
118#define TMP401_STATUS_LOCAL_CRIT BIT(0)
119#define TMP401_STATUS_REMOTE_CRIT BIT(1)
120#define TMP401_STATUS_REMOTE_OPEN BIT(2)
121#define TMP401_STATUS_REMOTE_LOW BIT(3)
122#define TMP401_STATUS_REMOTE_HIGH BIT(4)
123#define TMP401_STATUS_LOCAL_LOW BIT(5)
124#define TMP401_STATUS_LOCAL_HIGH BIT(6)
125
126/* On TMP432, each status has its own register */
127#define TMP432_STATUS_LOCAL BIT(0)
128#define TMP432_STATUS_REMOTE1 BIT(1)
129#define TMP432_STATUS_REMOTE2 BIT(2)
130
131/* Manufacturer / Device ID's */
132#define TMP401_MANUFACTURER_ID 0x55
133#define TMP401_DEVICE_ID 0x11
134#define TMP411A_DEVICE_ID 0x12
135#define TMP411B_DEVICE_ID 0x13
136#define TMP411C_DEVICE_ID 0x10
137#define TMP431_DEVICE_ID 0x31
138#define TMP432_DEVICE_ID 0x32
139
140/*
141 * Driver data (common to all clients)
142 */
143
144static const struct i2c_device_id tmp401_id[] = {
145 { "tmp401", tmp401 },
146 { "tmp411", tmp411 },
147 { "tmp431", tmp431 },
148 { "tmp432", tmp432 },
149 { }
150};
151MODULE_DEVICE_TABLE(i2c, tmp401_id);
152
153/*
154 * Client data (each client gets its own)
155 */
156
157struct tmp401_data {
158 struct i2c_client *client;
159 const struct attribute_group *groups[3];
160 struct mutex update_lock;
161 char valid; /* zero until following fields are valid */
162 unsigned long last_updated; /* in jiffies */
163 enum chips kind;
164
165 unsigned int update_interval; /* in milliseconds */
166
167 /* register values */
168 u8 status[4];
169 u8 config;
170 u16 temp[6][3];
171 u8 temp_crit_hyst;
172};
173
174/*
175 * Sysfs attr show / store functions
176 */
177
178static int tmp401_register_to_temp(u16 reg, u8 config)
179{
180 int temp = reg;
181
182 if (config & TMP401_CONFIG_RANGE)
183 temp -= 64 * 256;
184
185 return DIV_ROUND_CLOSEST(temp * 125, 32);
186}
187
188static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
189{
190 if (config & TMP401_CONFIG_RANGE) {
191 temp = clamp_val(temp, -64000, 191000);
192 temp += 64000;
193 } else
194 temp = clamp_val(temp, 0, 127000);
195
196 return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
197}
198
199static int tmp401_update_device_reg16(struct i2c_client *client,
200 struct tmp401_data *data)
201{
202 int i, j, val;
203 int num_regs = data->kind == tmp411 ? 6 : 4;
204 int num_sensors = data->kind == tmp432 ? 3 : 2;
205
206 for (i = 0; i < num_sensors; i++) { /* local / r1 / r2 */
207 for (j = 0; j < num_regs; j++) { /* temp / low / ... */
208 u8 regaddr;
209 /*
210 * High byte must be read first immediately followed
211 * by the low byte
212 */
213 regaddr = data->kind == tmp432 ?
214 TMP432_TEMP_MSB_READ[j][i] :
215 TMP401_TEMP_MSB_READ[j][i];
216 val = i2c_smbus_read_byte_data(client, regaddr);
217 if (val < 0)
218 return val;
219 data->temp[j][i] = val << 8;
220 if (j == 3) /* crit is msb only */
221 continue;
222 regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[j][i]
223 : TMP401_TEMP_LSB[j][i];
224 val = i2c_smbus_read_byte_data(client, regaddr);
225 if (val < 0)
226 return val;
227 data->temp[j][i] |= val;
228 }
229 }
230 return 0;
231}
232
233static struct tmp401_data *tmp401_update_device(struct device *dev)
234{
235 struct tmp401_data *data = dev_get_drvdata(dev);
236 struct i2c_client *client = data->client;
237 struct tmp401_data *ret = data;
238 int i, val;
239 unsigned long next_update;
240
241 mutex_lock(&data->update_lock);
242
243 next_update = data->last_updated +
244 msecs_to_jiffies(data->update_interval);
245 if (time_after(jiffies, next_update) || !data->valid) {
246 if (data->kind != tmp432) {
247 /*
248 * The driver uses the TMP432 status format internally.
249 * Convert status to TMP432 format for other chips.
250 */
251 val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
252 if (val < 0) {
253 ret = ERR_PTR(val);
254 goto abort;
255 }
256 data->status[0] =
257 (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
258 data->status[1] =
259 ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
260 ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
261 data->status[2] =
262 ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
263 ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
264 data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
265 | TMP401_STATUS_REMOTE_CRIT);
266 } else {
267 for (i = 0; i < ARRAY_SIZE(data->status); i++) {
268 val = i2c_smbus_read_byte_data(client,
269 TMP432_STATUS_REG[i]);
270 if (val < 0) {
271 ret = ERR_PTR(val);
272 goto abort;
273 }
274 data->status[i] = val;
275 }
276 }
277
278 val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
279 if (val < 0) {
280 ret = ERR_PTR(val);
281 goto abort;
282 }
283 data->config = val;
284 val = tmp401_update_device_reg16(client, data);
285 if (val < 0) {
286 ret = ERR_PTR(val);
287 goto abort;
288 }
289 val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
290 if (val < 0) {
291 ret = ERR_PTR(val);
292 goto abort;
293 }
294 data->temp_crit_hyst = val;
295
296 data->last_updated = jiffies;
297 data->valid = 1;
298 }
299
300abort:
301 mutex_unlock(&data->update_lock);
302 return ret;
303}
304
305static ssize_t show_temp(struct device *dev,
306 struct device_attribute *devattr, char *buf)
307{
308 int nr = to_sensor_dev_attr_2(devattr)->nr;
309 int index = to_sensor_dev_attr_2(devattr)->index;
310 struct tmp401_data *data = tmp401_update_device(dev);
311
312 if (IS_ERR(data))
313 return PTR_ERR(data);
314
315 return sprintf(buf, "%d\n",
316 tmp401_register_to_temp(data->temp[nr][index], data->config));
317}
318
319static ssize_t show_temp_crit_hyst(struct device *dev,
320 struct device_attribute *devattr, char *buf)
321{
322 int temp, index = to_sensor_dev_attr(devattr)->index;
323 struct tmp401_data *data = tmp401_update_device(dev);
324
325 if (IS_ERR(data))
326 return PTR_ERR(data);
327
328 mutex_lock(&data->update_lock);
329 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
330 temp -= data->temp_crit_hyst * 1000;
331 mutex_unlock(&data->update_lock);
332
333 return sprintf(buf, "%d\n", temp);
334}
335
336static ssize_t show_status(struct device *dev,
337 struct device_attribute *devattr, char *buf)
338{
339 int nr = to_sensor_dev_attr_2(devattr)->nr;
340 int mask = to_sensor_dev_attr_2(devattr)->index;
341 struct tmp401_data *data = tmp401_update_device(dev);
342
343 if (IS_ERR(data))
344 return PTR_ERR(data);
345
346 return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
347}
348
349static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
350 const char *buf, size_t count)
351{
352 int nr = to_sensor_dev_attr_2(devattr)->nr;
353 int index = to_sensor_dev_attr_2(devattr)->index;
354 struct tmp401_data *data = dev_get_drvdata(dev);
355 struct i2c_client *client = data->client;
356 long val;
357 u16 reg;
358 u8 regaddr;
359
360 if (kstrtol(buf, 10, &val))
361 return -EINVAL;
362
363 reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
364
365 mutex_lock(&data->update_lock);
366
367 regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
368 : TMP401_TEMP_MSB_WRITE[nr][index];
369 i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
370 if (nr != 3) {
371 regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[nr][index]
372 : TMP401_TEMP_LSB[nr][index];
373 i2c_smbus_write_byte_data(client, regaddr, reg & 0xFF);
374 }
375 data->temp[nr][index] = reg;
376
377 mutex_unlock(&data->update_lock);
378
379 return count;
380}
381
382static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
383 *devattr, const char *buf, size_t count)
384{
385 int temp, index = to_sensor_dev_attr(devattr)->index;
386 struct tmp401_data *data = tmp401_update_device(dev);
387 long val;
388 u8 reg;
389
390 if (IS_ERR(data))
391 return PTR_ERR(data);
392
393 if (kstrtol(buf, 10, &val))
394 return -EINVAL;
395
396 if (data->config & TMP401_CONFIG_RANGE)
397 val = clamp_val(val, -64000, 191000);
398 else
399 val = clamp_val(val, 0, 127000);
400
401 mutex_lock(&data->update_lock);
402 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
403 val = clamp_val(val, temp - 255000, temp);
404 reg = ((temp - val) + 500) / 1000;
405
406 i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
407 reg);
408
409 data->temp_crit_hyst = reg;
410
411 mutex_unlock(&data->update_lock);
412
413 return count;
414}
415
416/*
417 * Resets the historical measurements of minimum and maximum temperatures.
418 * This is done by writing any value to any of the minimum/maximum registers
419 * (0x30-0x37).
420 */
421static ssize_t reset_temp_history(struct device *dev,
422 struct device_attribute *devattr, const char *buf, size_t count)
423{
424 struct tmp401_data *data = dev_get_drvdata(dev);
425 struct i2c_client *client = data->client;
426 long val;
427
428 if (kstrtol(buf, 10, &val))
429 return -EINVAL;
430
431 if (val != 1) {
432 dev_err(dev,
433 "temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
434 val);
435 return -EINVAL;
436 }
437 mutex_lock(&data->update_lock);
438 i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
439 data->valid = 0;
440 mutex_unlock(&data->update_lock);
441
442 return count;
443}
444
445static ssize_t show_update_interval(struct device *dev,
446 struct device_attribute *attr, char *buf)
447{
448 struct tmp401_data *data = dev_get_drvdata(dev);
449
450 return sprintf(buf, "%u\n", data->update_interval);
451}
452
453static ssize_t set_update_interval(struct device *dev,
454 struct device_attribute *attr,
455 const char *buf, size_t count)
456{
457 struct tmp401_data *data = dev_get_drvdata(dev);
458 struct i2c_client *client = data->client;
459 unsigned long val;
460 int err, rate;
461
462 err = kstrtoul(buf, 10, &val);
463 if (err)
464 return err;
465
466 /*
467 * For valid rates, interval can be calculated as
468 * interval = (1 << (7 - rate)) * 125;
469 * Rounded rate is therefore
470 * rate = 7 - __fls(interval * 4 / (125 * 3));
471 * Use clamp_val() to avoid overflows, and to ensure valid input
472 * for __fls.
473 */
474 val = clamp_val(val, 125, 16000);
475 rate = 7 - __fls(val * 4 / (125 * 3));
476 mutex_lock(&data->update_lock);
477 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
478 data->update_interval = (1 << (7 - rate)) * 125;
479 mutex_unlock(&data->update_lock);
480
481 return count;
482}
483
484static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
485static SENSOR_DEVICE_ATTR_2(temp1_min, S_IWUSR | S_IRUGO, show_temp,
486 store_temp, 1, 0);
487static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp,
488 store_temp, 2, 0);
489static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
490 store_temp, 3, 0);
491static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
492 show_temp_crit_hyst, store_temp_crit_hyst, 0);
493static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_status, NULL,
494 1, TMP432_STATUS_LOCAL);
495static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_status, NULL,
496 2, TMP432_STATUS_LOCAL);
497static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_status, NULL,
498 3, TMP432_STATUS_LOCAL);
499static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
500static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp,
501 store_temp, 1, 1);
502static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp,
503 store_temp, 2, 1);
504static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IWUSR | S_IRUGO, show_temp,
505 store_temp, 3, 1);
506static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst,
507 NULL, 1);
508static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_status, NULL,
509 0, TMP432_STATUS_REMOTE1);
510static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_status, NULL,
511 1, TMP432_STATUS_REMOTE1);
512static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_status, NULL,
513 2, TMP432_STATUS_REMOTE1);
514static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_status, NULL,
515 3, TMP432_STATUS_REMOTE1);
516
517static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
518 set_update_interval);
519
520static struct attribute *tmp401_attributes[] = {
521 &sensor_dev_attr_temp1_input.dev_attr.attr,
522 &sensor_dev_attr_temp1_min.dev_attr.attr,
523 &sensor_dev_attr_temp1_max.dev_attr.attr,
524 &sensor_dev_attr_temp1_crit.dev_attr.attr,
525 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
526 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
527 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
528 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
529
530 &sensor_dev_attr_temp2_input.dev_attr.attr,
531 &sensor_dev_attr_temp2_min.dev_attr.attr,
532 &sensor_dev_attr_temp2_max.dev_attr.attr,
533 &sensor_dev_attr_temp2_crit.dev_attr.attr,
534 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
535 &sensor_dev_attr_temp2_fault.dev_attr.attr,
536 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
537 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
538 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
539
540 &dev_attr_update_interval.attr,
541
542 NULL
543};
544
545static const struct attribute_group tmp401_group = {
546 .attrs = tmp401_attributes,
547};
548
549/*
550 * Additional features of the TMP411 chip.
551 * The TMP411 stores the minimum and maximum
552 * temperature measured since power-on, chip-reset, or
553 * minimum and maximum register reset for both the local
554 * and remote channels.
555 */
556static SENSOR_DEVICE_ATTR_2(temp1_lowest, S_IRUGO, show_temp, NULL, 4, 0);
557static SENSOR_DEVICE_ATTR_2(temp1_highest, S_IRUGO, show_temp, NULL, 5, 0);
558static SENSOR_DEVICE_ATTR_2(temp2_lowest, S_IRUGO, show_temp, NULL, 4, 1);
559static SENSOR_DEVICE_ATTR_2(temp2_highest, S_IRUGO, show_temp, NULL, 5, 1);
560static SENSOR_DEVICE_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history,
561 0);
562
563static struct attribute *tmp411_attributes[] = {
564 &sensor_dev_attr_temp1_highest.dev_attr.attr,
565 &sensor_dev_attr_temp1_lowest.dev_attr.attr,
566 &sensor_dev_attr_temp2_highest.dev_attr.attr,
567 &sensor_dev_attr_temp2_lowest.dev_attr.attr,
568 &sensor_dev_attr_temp_reset_history.dev_attr.attr,
569 NULL
570};
571
572static const struct attribute_group tmp411_group = {
573 .attrs = tmp411_attributes,
574};
575
576static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0, 2);
577static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp,
578 store_temp, 1, 2);
579static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp,
580 store_temp, 2, 2);
581static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
582 store_temp, 3, 2);
583static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temp_crit_hyst,
584 NULL, 2);
585static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_status, NULL,
586 0, TMP432_STATUS_REMOTE2);
587static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_status, NULL,
588 1, TMP432_STATUS_REMOTE2);
589static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_status, NULL,
590 2, TMP432_STATUS_REMOTE2);
591static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_status, NULL,
592 3, TMP432_STATUS_REMOTE2);
593
594static struct attribute *tmp432_attributes[] = {
595 &sensor_dev_attr_temp3_input.dev_attr.attr,
596 &sensor_dev_attr_temp3_min.dev_attr.attr,
597 &sensor_dev_attr_temp3_max.dev_attr.attr,
598 &sensor_dev_attr_temp3_crit.dev_attr.attr,
599 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
600 &sensor_dev_attr_temp3_fault.dev_attr.attr,
601 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
602 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
603 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
604
605 NULL
606};
607
608static const struct attribute_group tmp432_group = {
609 .attrs = tmp432_attributes,
610};
611
612/*
613 * Begin non sysfs callback code (aka Real code)
614 */
615
616static void tmp401_init_client(struct tmp401_data *data,
617 struct i2c_client *client)
618{
619 int config, config_orig;
620
621 /* Set the conversion rate to 2 Hz */
622 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
623 data->update_interval = 500;
624
625 /* Start conversions (disable shutdown if necessary) */
626 config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
627 if (config < 0) {
628 dev_warn(&client->dev, "Initialization failed!\n");
629 return;
630 }
631
632 config_orig = config;
633 config &= ~TMP401_CONFIG_SHUTDOWN;
634
635 if (config != config_orig)
636 i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config);
637}
638
639static int tmp401_detect(struct i2c_client *client,
640 struct i2c_board_info *info)
641{
642 enum chips kind;
643 struct i2c_adapter *adapter = client->adapter;
644 u8 reg;
645
646 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
647 return -ENODEV;
648
649 /* Detect and identify the chip */
650 reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
651 if (reg != TMP401_MANUFACTURER_ID)
652 return -ENODEV;
653
654 reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
655
656 switch (reg) {
657 case TMP401_DEVICE_ID:
658 if (client->addr != 0x4c)
659 return -ENODEV;
660 kind = tmp401;
661 break;
662 case TMP411A_DEVICE_ID:
663 if (client->addr != 0x4c)
664 return -ENODEV;
665 kind = tmp411;
666 break;
667 case TMP411B_DEVICE_ID:
668 if (client->addr != 0x4d)
669 return -ENODEV;
670 kind = tmp411;
671 break;
672 case TMP411C_DEVICE_ID:
673 if (client->addr != 0x4e)
674 return -ENODEV;
675 kind = tmp411;
676 break;
677 case TMP431_DEVICE_ID:
678 if (client->addr == 0x4e)
679 return -ENODEV;
680 kind = tmp431;
681 break;
682 case TMP432_DEVICE_ID:
683 if (client->addr == 0x4e)
684 return -ENODEV;
685 kind = tmp432;
686 break;
687 default:
688 return -ENODEV;
689 }
690
691 reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
692 if (reg & 0x1b)
693 return -ENODEV;
694
695 reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
696 /* Datasheet says: 0x1-0x6 */
697 if (reg > 15)
698 return -ENODEV;
699
700 strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
701
702 return 0;
703}
704
705static int tmp401_probe(struct i2c_client *client,
706 const struct i2c_device_id *id)
707{
708 const char *names[] = { "TMP401", "TMP411", "TMP431", "TMP432" };
709 struct device *dev = &client->dev;
710 struct device *hwmon_dev;
711 struct tmp401_data *data;
712 int groups = 0;
713
714 data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
715 if (!data)
716 return -ENOMEM;
717
718 data->client = client;
719 mutex_init(&data->update_lock);
720 data->kind = id->driver_data;
721
722 /* Initialize the TMP401 chip */
723 tmp401_init_client(data, client);
724
725 /* Register sysfs hooks */
726 data->groups[groups++] = &tmp401_group;
727
728 /* Register additional tmp411 sysfs hooks */
729 if (data->kind == tmp411)
730 data->groups[groups++] = &tmp411_group;
731
732 /* Register additional tmp432 sysfs hooks */
733 if (data->kind == tmp432)
734 data->groups[groups++] = &tmp432_group;
735
736 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
737 data, data->groups);
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 struct i2c_driver tmp401_driver = {
747 .class = I2C_CLASS_HWMON,
748 .driver = {
749 .name = "tmp401",
750 },
751 .probe = tmp401_probe,
752 .id_table = tmp401_id,
753 .detect = tmp401_detect,
754 .address_list = normal_i2c,
755};
756
757module_i2c_driver(tmp401_driver);
758
759MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
760MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
761MODULE_LICENSE("GPL");