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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 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23/*
24 * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
25 *
26 * Note this IC is in some aspect similar to the LM90, but it has quite a
27 * few differences too, for example the local temp has a higher resolution
28 * and thus has 16 bits registers for its value and limit instead of 8 bits.
29 */
30
31#include <linux/module.h>
32#include <linux/init.h>
33#include <linux/slab.h>
34#include <linux/jiffies.h>
35#include <linux/i2c.h>
36#include <linux/hwmon.h>
37#include <linux/hwmon-sysfs.h>
38#include <linux/err.h>
39#include <linux/mutex.h>
40#include <linux/sysfs.h>
41
42/* Addresses to scan */
43static const unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END };
44
45enum chips { tmp401, tmp411 };
46
47/*
48 * The TMP401 registers, note some registers have different addresses for
49 * reading and writing
50 */
51#define TMP401_STATUS 0x02
52#define TMP401_CONFIG_READ 0x03
53#define TMP401_CONFIG_WRITE 0x09
54#define TMP401_CONVERSION_RATE_READ 0x04
55#define TMP401_CONVERSION_RATE_WRITE 0x0A
56#define TMP401_TEMP_CRIT_HYST 0x21
57#define TMP401_CONSECUTIVE_ALERT 0x22
58#define TMP401_MANUFACTURER_ID_REG 0xFE
59#define TMP401_DEVICE_ID_REG 0xFF
60#define TMP411_N_FACTOR_REG 0x18
61
62static const u8 TMP401_TEMP_MSB[2] = { 0x00, 0x01 };
63static const u8 TMP401_TEMP_LSB[2] = { 0x15, 0x10 };
64static const u8 TMP401_TEMP_LOW_LIMIT_MSB_READ[2] = { 0x06, 0x08 };
65static const u8 TMP401_TEMP_LOW_LIMIT_MSB_WRITE[2] = { 0x0C, 0x0E };
66static const u8 TMP401_TEMP_LOW_LIMIT_LSB[2] = { 0x17, 0x14 };
67static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_READ[2] = { 0x05, 0x07 };
68static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[2] = { 0x0B, 0x0D };
69static const u8 TMP401_TEMP_HIGH_LIMIT_LSB[2] = { 0x16, 0x13 };
70/* These are called the THERM limit / hysteresis / mask in the datasheet */
71static const u8 TMP401_TEMP_CRIT_LIMIT[2] = { 0x20, 0x19 };
72
73static const u8 TMP411_TEMP_LOWEST_MSB[2] = { 0x30, 0x34 };
74static const u8 TMP411_TEMP_LOWEST_LSB[2] = { 0x31, 0x35 };
75static const u8 TMP411_TEMP_HIGHEST_MSB[2] = { 0x32, 0x36 };
76static const u8 TMP411_TEMP_HIGHEST_LSB[2] = { 0x33, 0x37 };
77
78/* Flags */
79#define TMP401_CONFIG_RANGE 0x04
80#define TMP401_CONFIG_SHUTDOWN 0x40
81#define TMP401_STATUS_LOCAL_CRIT 0x01
82#define TMP401_STATUS_REMOTE_CRIT 0x02
83#define TMP401_STATUS_REMOTE_OPEN 0x04
84#define TMP401_STATUS_REMOTE_LOW 0x08
85#define TMP401_STATUS_REMOTE_HIGH 0x10
86#define TMP401_STATUS_LOCAL_LOW 0x20
87#define TMP401_STATUS_LOCAL_HIGH 0x40
88
89/* Manufacturer / Device ID's */
90#define TMP401_MANUFACTURER_ID 0x55
91#define TMP401_DEVICE_ID 0x11
92#define TMP411_DEVICE_ID 0x12
93
94/*
95 * Driver data (common to all clients)
96 */
97
98static const struct i2c_device_id tmp401_id[] = {
99 { "tmp401", tmp401 },
100 { "tmp411", tmp411 },
101 { }
102};
103MODULE_DEVICE_TABLE(i2c, tmp401_id);
104
105/*
106 * Client data (each client gets its own)
107 */
108
109struct tmp401_data {
110 struct device *hwmon_dev;
111 struct mutex update_lock;
112 char valid; /* zero until following fields are valid */
113 unsigned long last_updated; /* in jiffies */
114 enum chips kind;
115
116 /* register values */
117 u8 status;
118 u8 config;
119 u16 temp[2];
120 u16 temp_low[2];
121 u16 temp_high[2];
122 u8 temp_crit[2];
123 u8 temp_crit_hyst;
124 u16 temp_lowest[2];
125 u16 temp_highest[2];
126};
127
128/*
129 * Sysfs attr show / store functions
130 */
131
132static int tmp401_register_to_temp(u16 reg, u8 config)
133{
134 int temp = reg;
135
136 if (config & TMP401_CONFIG_RANGE)
137 temp -= 64 * 256;
138
139 return (temp * 625 + 80) / 160;
140}
141
142static u16 tmp401_temp_to_register(long temp, u8 config)
143{
144 if (config & TMP401_CONFIG_RANGE) {
145 temp = SENSORS_LIMIT(temp, -64000, 191000);
146 temp += 64000;
147 } else
148 temp = SENSORS_LIMIT(temp, 0, 127000);
149
150 return (temp * 160 + 312) / 625;
151}
152
153static int tmp401_crit_register_to_temp(u8 reg, u8 config)
154{
155 int temp = reg;
156
157 if (config & TMP401_CONFIG_RANGE)
158 temp -= 64;
159
160 return temp * 1000;
161}
162
163static u8 tmp401_crit_temp_to_register(long temp, u8 config)
164{
165 if (config & TMP401_CONFIG_RANGE) {
166 temp = SENSORS_LIMIT(temp, -64000, 191000);
167 temp += 64000;
168 } else
169 temp = SENSORS_LIMIT(temp, 0, 127000);
170
171 return (temp + 500) / 1000;
172}
173
174static struct tmp401_data *tmp401_update_device_reg16(
175 struct i2c_client *client, struct tmp401_data *data)
176{
177 int i;
178
179 for (i = 0; i < 2; i++) {
180 /*
181 * High byte must be read first immediately followed
182 * by the low byte
183 */
184 data->temp[i] = i2c_smbus_read_byte_data(client,
185 TMP401_TEMP_MSB[i]) << 8;
186 data->temp[i] |= i2c_smbus_read_byte_data(client,
187 TMP401_TEMP_LSB[i]);
188 data->temp_low[i] = i2c_smbus_read_byte_data(client,
189 TMP401_TEMP_LOW_LIMIT_MSB_READ[i]) << 8;
190 data->temp_low[i] |= i2c_smbus_read_byte_data(client,
191 TMP401_TEMP_LOW_LIMIT_LSB[i]);
192 data->temp_high[i] = i2c_smbus_read_byte_data(client,
193 TMP401_TEMP_HIGH_LIMIT_MSB_READ[i]) << 8;
194 data->temp_high[i] |= i2c_smbus_read_byte_data(client,
195 TMP401_TEMP_HIGH_LIMIT_LSB[i]);
196 data->temp_crit[i] = i2c_smbus_read_byte_data(client,
197 TMP401_TEMP_CRIT_LIMIT[i]);
198
199 if (data->kind == tmp411) {
200 data->temp_lowest[i] = i2c_smbus_read_byte_data(client,
201 TMP411_TEMP_LOWEST_MSB[i]) << 8;
202 data->temp_lowest[i] |= i2c_smbus_read_byte_data(
203 client, TMP411_TEMP_LOWEST_LSB[i]);
204
205 data->temp_highest[i] = i2c_smbus_read_byte_data(
206 client, TMP411_TEMP_HIGHEST_MSB[i]) << 8;
207 data->temp_highest[i] |= i2c_smbus_read_byte_data(
208 client, TMP411_TEMP_HIGHEST_LSB[i]);
209 }
210 }
211 return data;
212}
213
214static struct tmp401_data *tmp401_update_device(struct device *dev)
215{
216 struct i2c_client *client = to_i2c_client(dev);
217 struct tmp401_data *data = i2c_get_clientdata(client);
218
219 mutex_lock(&data->update_lock);
220
221 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
222 data->status = i2c_smbus_read_byte_data(client, TMP401_STATUS);
223 data->config = i2c_smbus_read_byte_data(client,
224 TMP401_CONFIG_READ);
225 tmp401_update_device_reg16(client, data);
226
227 data->temp_crit_hyst = i2c_smbus_read_byte_data(client,
228 TMP401_TEMP_CRIT_HYST);
229
230 data->last_updated = jiffies;
231 data->valid = 1;
232 }
233
234 mutex_unlock(&data->update_lock);
235
236 return data;
237}
238
239static ssize_t show_temp_value(struct device *dev,
240 struct device_attribute *devattr, char *buf)
241{
242 int index = to_sensor_dev_attr(devattr)->index;
243 struct tmp401_data *data = tmp401_update_device(dev);
244
245 return sprintf(buf, "%d\n",
246 tmp401_register_to_temp(data->temp[index], data->config));
247}
248
249static ssize_t show_temp_min(struct device *dev,
250 struct device_attribute *devattr, char *buf)
251{
252 int index = to_sensor_dev_attr(devattr)->index;
253 struct tmp401_data *data = tmp401_update_device(dev);
254
255 return sprintf(buf, "%d\n",
256 tmp401_register_to_temp(data->temp_low[index], data->config));
257}
258
259static ssize_t show_temp_max(struct device *dev,
260 struct device_attribute *devattr, char *buf)
261{
262 int index = to_sensor_dev_attr(devattr)->index;
263 struct tmp401_data *data = tmp401_update_device(dev);
264
265 return sprintf(buf, "%d\n",
266 tmp401_register_to_temp(data->temp_high[index], data->config));
267}
268
269static ssize_t show_temp_crit(struct device *dev,
270 struct device_attribute *devattr, char *buf)
271{
272 int index = to_sensor_dev_attr(devattr)->index;
273 struct tmp401_data *data = tmp401_update_device(dev);
274
275 return sprintf(buf, "%d\n",
276 tmp401_crit_register_to_temp(data->temp_crit[index],
277 data->config));
278}
279
280static ssize_t show_temp_crit_hyst(struct device *dev,
281 struct device_attribute *devattr, char *buf)
282{
283 int temp, index = to_sensor_dev_attr(devattr)->index;
284 struct tmp401_data *data = tmp401_update_device(dev);
285
286 mutex_lock(&data->update_lock);
287 temp = tmp401_crit_register_to_temp(data->temp_crit[index],
288 data->config);
289 temp -= data->temp_crit_hyst * 1000;
290 mutex_unlock(&data->update_lock);
291
292 return sprintf(buf, "%d\n", temp);
293}
294
295static ssize_t show_temp_lowest(struct device *dev,
296 struct device_attribute *devattr, char *buf)
297{
298 int index = to_sensor_dev_attr(devattr)->index;
299 struct tmp401_data *data = tmp401_update_device(dev);
300
301 return sprintf(buf, "%d\n",
302 tmp401_register_to_temp(data->temp_lowest[index],
303 data->config));
304}
305
306static ssize_t show_temp_highest(struct device *dev,
307 struct device_attribute *devattr, char *buf)
308{
309 int index = to_sensor_dev_attr(devattr)->index;
310 struct tmp401_data *data = tmp401_update_device(dev);
311
312 return sprintf(buf, "%d\n",
313 tmp401_register_to_temp(data->temp_highest[index],
314 data->config));
315}
316
317static ssize_t show_status(struct device *dev,
318 struct device_attribute *devattr, char *buf)
319{
320 int mask = to_sensor_dev_attr(devattr)->index;
321 struct tmp401_data *data = tmp401_update_device(dev);
322
323 if (data->status & mask)
324 return sprintf(buf, "1\n");
325 else
326 return sprintf(buf, "0\n");
327}
328
329static ssize_t store_temp_min(struct device *dev, struct device_attribute
330 *devattr, const char *buf, size_t count)
331{
332 int index = to_sensor_dev_attr(devattr)->index;
333 struct tmp401_data *data = tmp401_update_device(dev);
334 long val;
335 u16 reg;
336
337 if (strict_strtol(buf, 10, &val))
338 return -EINVAL;
339
340 reg = tmp401_temp_to_register(val, data->config);
341
342 mutex_lock(&data->update_lock);
343
344 i2c_smbus_write_byte_data(to_i2c_client(dev),
345 TMP401_TEMP_LOW_LIMIT_MSB_WRITE[index], reg >> 8);
346 i2c_smbus_write_byte_data(to_i2c_client(dev),
347 TMP401_TEMP_LOW_LIMIT_LSB[index], reg & 0xFF);
348
349 data->temp_low[index] = reg;
350
351 mutex_unlock(&data->update_lock);
352
353 return count;
354}
355
356static ssize_t store_temp_max(struct device *dev, struct device_attribute
357 *devattr, const char *buf, size_t count)
358{
359 int index = to_sensor_dev_attr(devattr)->index;
360 struct tmp401_data *data = tmp401_update_device(dev);
361 long val;
362 u16 reg;
363
364 if (strict_strtol(buf, 10, &val))
365 return -EINVAL;
366
367 reg = tmp401_temp_to_register(val, data->config);
368
369 mutex_lock(&data->update_lock);
370
371 i2c_smbus_write_byte_data(to_i2c_client(dev),
372 TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[index], reg >> 8);
373 i2c_smbus_write_byte_data(to_i2c_client(dev),
374 TMP401_TEMP_HIGH_LIMIT_LSB[index], reg & 0xFF);
375
376 data->temp_high[index] = reg;
377
378 mutex_unlock(&data->update_lock);
379
380 return count;
381}
382
383static ssize_t store_temp_crit(struct device *dev, struct device_attribute
384 *devattr, const char *buf, size_t count)
385{
386 int index = to_sensor_dev_attr(devattr)->index;
387 struct tmp401_data *data = tmp401_update_device(dev);
388 long val;
389 u8 reg;
390
391 if (strict_strtol(buf, 10, &val))
392 return -EINVAL;
393
394 reg = tmp401_crit_temp_to_register(val, data->config);
395
396 mutex_lock(&data->update_lock);
397
398 i2c_smbus_write_byte_data(to_i2c_client(dev),
399 TMP401_TEMP_CRIT_LIMIT[index], reg);
400
401 data->temp_crit[index] = reg;
402
403 mutex_unlock(&data->update_lock);
404
405 return count;
406}
407
408static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
409 *devattr, const char *buf, size_t count)
410{
411 int temp, index = to_sensor_dev_attr(devattr)->index;
412 struct tmp401_data *data = tmp401_update_device(dev);
413 long val;
414 u8 reg;
415
416 if (strict_strtol(buf, 10, &val))
417 return -EINVAL;
418
419 if (data->config & TMP401_CONFIG_RANGE)
420 val = SENSORS_LIMIT(val, -64000, 191000);
421 else
422 val = SENSORS_LIMIT(val, 0, 127000);
423
424 mutex_lock(&data->update_lock);
425 temp = tmp401_crit_register_to_temp(data->temp_crit[index],
426 data->config);
427 val = SENSORS_LIMIT(val, temp - 255000, temp);
428 reg = ((temp - val) + 500) / 1000;
429
430 i2c_smbus_write_byte_data(to_i2c_client(dev),
431 TMP401_TEMP_CRIT_HYST, reg);
432
433 data->temp_crit_hyst = reg;
434
435 mutex_unlock(&data->update_lock);
436
437 return count;
438}
439
440/*
441 * Resets the historical measurements of minimum and maximum temperatures.
442 * This is done by writing any value to any of the minimum/maximum registers
443 * (0x30-0x37).
444 */
445static ssize_t reset_temp_history(struct device *dev,
446 struct device_attribute *devattr, const char *buf, size_t count)
447{
448 long val;
449
450 if (strict_strtol(buf, 10, &val))
451 return -EINVAL;
452
453 if (val != 1) {
454 dev_err(dev, "temp_reset_history value %ld not"
455 " supported. Use 1 to reset the history!\n", val);
456 return -EINVAL;
457 }
458 i2c_smbus_write_byte_data(to_i2c_client(dev),
459 TMP411_TEMP_LOWEST_MSB[0], val);
460
461 return count;
462}
463
464static struct sensor_device_attribute tmp401_attr[] = {
465 SENSOR_ATTR(temp1_input, S_IRUGO, show_temp_value, NULL, 0),
466 SENSOR_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
467 store_temp_min, 0),
468 SENSOR_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
469 store_temp_max, 0),
470 SENSOR_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit,
471 store_temp_crit, 0),
472 SENSOR_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_crit_hyst,
473 store_temp_crit_hyst, 0),
474 SENSOR_ATTR(temp1_min_alarm, S_IRUGO, show_status, NULL,
475 TMP401_STATUS_LOCAL_LOW),
476 SENSOR_ATTR(temp1_max_alarm, S_IRUGO, show_status, NULL,
477 TMP401_STATUS_LOCAL_HIGH),
478 SENSOR_ATTR(temp1_crit_alarm, S_IRUGO, show_status, NULL,
479 TMP401_STATUS_LOCAL_CRIT),
480 SENSOR_ATTR(temp2_input, S_IRUGO, show_temp_value, NULL, 1),
481 SENSOR_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
482 store_temp_min, 1),
483 SENSOR_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
484 store_temp_max, 1),
485 SENSOR_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit,
486 store_temp_crit, 1),
487 SENSOR_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst, NULL, 1),
488 SENSOR_ATTR(temp2_fault, S_IRUGO, show_status, NULL,
489 TMP401_STATUS_REMOTE_OPEN),
490 SENSOR_ATTR(temp2_min_alarm, S_IRUGO, show_status, NULL,
491 TMP401_STATUS_REMOTE_LOW),
492 SENSOR_ATTR(temp2_max_alarm, S_IRUGO, show_status, NULL,
493 TMP401_STATUS_REMOTE_HIGH),
494 SENSOR_ATTR(temp2_crit_alarm, S_IRUGO, show_status, NULL,
495 TMP401_STATUS_REMOTE_CRIT),
496};
497
498/*
499 * Additional features of the TMP411 chip.
500 * The TMP411 stores the minimum and maximum
501 * temperature measured since power-on, chip-reset, or
502 * minimum and maximum register reset for both the local
503 * and remote channels.
504 */
505static struct sensor_device_attribute tmp411_attr[] = {
506 SENSOR_ATTR(temp1_highest, S_IRUGO, show_temp_highest, NULL, 0),
507 SENSOR_ATTR(temp1_lowest, S_IRUGO, show_temp_lowest, NULL, 0),
508 SENSOR_ATTR(temp2_highest, S_IRUGO, show_temp_highest, NULL, 1),
509 SENSOR_ATTR(temp2_lowest, S_IRUGO, show_temp_lowest, NULL, 1),
510 SENSOR_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history, 0),
511};
512
513/*
514 * Begin non sysfs callback code (aka Real code)
515 */
516
517static void tmp401_init_client(struct i2c_client *client)
518{
519 int config, config_orig;
520
521 /* Set the conversion rate to 2 Hz */
522 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
523
524 /* Start conversions (disable shutdown if necessary) */
525 config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
526 if (config < 0) {
527 dev_warn(&client->dev, "Initialization failed!\n");
528 return;
529 }
530
531 config_orig = config;
532 config &= ~TMP401_CONFIG_SHUTDOWN;
533
534 if (config != config_orig)
535 i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config);
536}
537
538static int tmp401_detect(struct i2c_client *client,
539 struct i2c_board_info *info)
540{
541 enum chips kind;
542 struct i2c_adapter *adapter = client->adapter;
543 u8 reg;
544
545 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
546 return -ENODEV;
547
548 /* Detect and identify the chip */
549 reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
550 if (reg != TMP401_MANUFACTURER_ID)
551 return -ENODEV;
552
553 reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
554
555 switch (reg) {
556 case TMP401_DEVICE_ID:
557 kind = tmp401;
558 break;
559 case TMP411_DEVICE_ID:
560 kind = tmp411;
561 break;
562 default:
563 return -ENODEV;
564 }
565
566 reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
567 if (reg & 0x1b)
568 return -ENODEV;
569
570 reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
571 /* Datasheet says: 0x1-0x6 */
572 if (reg > 15)
573 return -ENODEV;
574
575 strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
576
577 return 0;
578}
579
580static int tmp401_remove(struct i2c_client *client)
581{
582 struct tmp401_data *data = i2c_get_clientdata(client);
583 int i;
584
585 if (data->hwmon_dev)
586 hwmon_device_unregister(data->hwmon_dev);
587
588 for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++)
589 device_remove_file(&client->dev, &tmp401_attr[i].dev_attr);
590
591 if (data->kind == tmp411) {
592 for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++)
593 device_remove_file(&client->dev,
594 &tmp411_attr[i].dev_attr);
595 }
596
597 kfree(data);
598 return 0;
599}
600
601static int tmp401_probe(struct i2c_client *client,
602 const struct i2c_device_id *id)
603{
604 int i, err = 0;
605 struct tmp401_data *data;
606 const char *names[] = { "TMP401", "TMP411" };
607
608 data = kzalloc(sizeof(struct tmp401_data), GFP_KERNEL);
609 if (!data)
610 return -ENOMEM;
611
612 i2c_set_clientdata(client, data);
613 mutex_init(&data->update_lock);
614 data->kind = id->driver_data;
615
616 /* Initialize the TMP401 chip */
617 tmp401_init_client(client);
618
619 /* Register sysfs hooks */
620 for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++) {
621 err = device_create_file(&client->dev,
622 &tmp401_attr[i].dev_attr);
623 if (err)
624 goto exit_remove;
625 }
626
627 /* Register aditional tmp411 sysfs hooks */
628 if (data->kind == tmp411) {
629 for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++) {
630 err = device_create_file(&client->dev,
631 &tmp411_attr[i].dev_attr);
632 if (err)
633 goto exit_remove;
634 }
635 }
636
637 data->hwmon_dev = hwmon_device_register(&client->dev);
638 if (IS_ERR(data->hwmon_dev)) {
639 err = PTR_ERR(data->hwmon_dev);
640 data->hwmon_dev = NULL;
641 goto exit_remove;
642 }
643
644 dev_info(&client->dev, "Detected TI %s chip\n", names[data->kind]);
645
646 return 0;
647
648exit_remove:
649 tmp401_remove(client); /* will also free data for us */
650 return err;
651}
652
653static struct i2c_driver tmp401_driver = {
654 .class = I2C_CLASS_HWMON,
655 .driver = {
656 .name = "tmp401",
657 },
658 .probe = tmp401_probe,
659 .remove = tmp401_remove,
660 .id_table = tmp401_id,
661 .detect = tmp401_detect,
662 .address_list = normal_i2c,
663};
664
665static int __init tmp401_init(void)
666{
667 return i2c_add_driver(&tmp401_driver);
668}
669
670static void __exit tmp401_exit(void)
671{
672 i2c_del_driver(&tmp401_driver);
673}
674
675MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
676MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
677MODULE_LICENSE("GPL");
678
679module_init(tmp401_init);
680module_exit(tmp401_exit);
1/* tmp401.c
2 *
3 * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>
4 * Preliminary tmp411 support by:
5 * Gabriel Konat, Sander Leget, Wouter Willems
6 * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>
7 *
8 * Cleanup and support for TMP431 and TMP432 by Guenter Roeck
9 * Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26/*
27 * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
28 *
29 * Note this IC is in some aspect similar to the LM90, but it has quite a
30 * few differences too, for example the local temp has a higher resolution
31 * and thus has 16 bits registers for its value and limit instead of 8 bits.
32 */
33
34#include <linux/module.h>
35#include <linux/init.h>
36#include <linux/bitops.h>
37#include <linux/slab.h>
38#include <linux/jiffies.h>
39#include <linux/i2c.h>
40#include <linux/hwmon.h>
41#include <linux/hwmon-sysfs.h>
42#include <linux/err.h>
43#include <linux/mutex.h>
44#include <linux/sysfs.h>
45
46/* Addresses to scan */
47static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d,
48 0x4e, 0x4f, I2C_CLIENT_END };
49
50enum chips { tmp401, tmp411, tmp431, tmp432, tmp435 };
51
52/*
53 * The TMP401 registers, note some registers have different addresses for
54 * reading and writing
55 */
56#define TMP401_STATUS 0x02
57#define TMP401_CONFIG_READ 0x03
58#define TMP401_CONFIG_WRITE 0x09
59#define TMP401_CONVERSION_RATE_READ 0x04
60#define TMP401_CONVERSION_RATE_WRITE 0x0A
61#define TMP401_TEMP_CRIT_HYST 0x21
62#define TMP401_MANUFACTURER_ID_REG 0xFE
63#define TMP401_DEVICE_ID_REG 0xFF
64
65static const u8 TMP401_TEMP_MSB_READ[6][2] = {
66 { 0x00, 0x01 }, /* temp */
67 { 0x06, 0x08 }, /* low limit */
68 { 0x05, 0x07 }, /* high limit */
69 { 0x20, 0x19 }, /* therm (crit) limit */
70 { 0x30, 0x34 }, /* lowest */
71 { 0x32, 0x36 }, /* highest */
72};
73
74static const u8 TMP401_TEMP_MSB_WRITE[6][2] = {
75 { 0, 0 }, /* temp (unused) */
76 { 0x0C, 0x0E }, /* low limit */
77 { 0x0B, 0x0D }, /* high limit */
78 { 0x20, 0x19 }, /* therm (crit) limit */
79 { 0x30, 0x34 }, /* lowest */
80 { 0x32, 0x36 }, /* highest */
81};
82
83static const u8 TMP401_TEMP_LSB[6][2] = {
84 { 0x15, 0x10 }, /* temp */
85 { 0x17, 0x14 }, /* low limit */
86 { 0x16, 0x13 }, /* high limit */
87 { 0, 0 }, /* therm (crit) limit (unused) */
88 { 0x31, 0x35 }, /* lowest */
89 { 0x33, 0x37 }, /* highest */
90};
91
92static const u8 TMP432_TEMP_MSB_READ[4][3] = {
93 { 0x00, 0x01, 0x23 }, /* temp */
94 { 0x06, 0x08, 0x16 }, /* low limit */
95 { 0x05, 0x07, 0x15 }, /* high limit */
96 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
97};
98
99static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
100 { 0, 0, 0 }, /* temp - unused */
101 { 0x0C, 0x0E, 0x16 }, /* low limit */
102 { 0x0B, 0x0D, 0x15 }, /* high limit */
103 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
104};
105
106static const u8 TMP432_TEMP_LSB[3][3] = {
107 { 0x29, 0x10, 0x24 }, /* temp */
108 { 0x3E, 0x14, 0x18 }, /* low limit */
109 { 0x3D, 0x13, 0x17 }, /* high limit */
110};
111
112/* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
113static const u8 TMP432_STATUS_REG[] = {
114 0x1b, 0x36, 0x35, 0x37 };
115
116/* Flags */
117#define TMP401_CONFIG_RANGE BIT(2)
118#define TMP401_CONFIG_SHUTDOWN BIT(6)
119#define TMP401_STATUS_LOCAL_CRIT BIT(0)
120#define TMP401_STATUS_REMOTE_CRIT BIT(1)
121#define TMP401_STATUS_REMOTE_OPEN BIT(2)
122#define TMP401_STATUS_REMOTE_LOW BIT(3)
123#define TMP401_STATUS_REMOTE_HIGH BIT(4)
124#define TMP401_STATUS_LOCAL_LOW BIT(5)
125#define TMP401_STATUS_LOCAL_HIGH BIT(6)
126
127/* On TMP432, each status has its own register */
128#define TMP432_STATUS_LOCAL BIT(0)
129#define TMP432_STATUS_REMOTE1 BIT(1)
130#define TMP432_STATUS_REMOTE2 BIT(2)
131
132/* Manufacturer / Device ID's */
133#define TMP401_MANUFACTURER_ID 0x55
134#define TMP401_DEVICE_ID 0x11
135#define TMP411A_DEVICE_ID 0x12
136#define TMP411B_DEVICE_ID 0x13
137#define TMP411C_DEVICE_ID 0x10
138#define TMP431_DEVICE_ID 0x31
139#define TMP432_DEVICE_ID 0x32
140#define TMP435_DEVICE_ID 0x35
141
142/*
143 * Driver data (common to all clients)
144 */
145
146static const struct i2c_device_id tmp401_id[] = {
147 { "tmp401", tmp401 },
148 { "tmp411", tmp411 },
149 { "tmp431", tmp431 },
150 { "tmp432", tmp432 },
151 { "tmp435", tmp435 },
152 { }
153};
154MODULE_DEVICE_TABLE(i2c, tmp401_id);
155
156/*
157 * Client data (each client gets its own)
158 */
159
160struct tmp401_data {
161 struct i2c_client *client;
162 const struct attribute_group *groups[3];
163 struct mutex update_lock;
164 char valid; /* zero until following fields are valid */
165 unsigned long last_updated; /* in jiffies */
166 enum chips kind;
167
168 unsigned int update_interval; /* in milliseconds */
169
170 /* register values */
171 u8 status[4];
172 u8 config;
173 u16 temp[6][3];
174 u8 temp_crit_hyst;
175};
176
177/*
178 * Sysfs attr show / store functions
179 */
180
181static int tmp401_register_to_temp(u16 reg, u8 config)
182{
183 int temp = reg;
184
185 if (config & TMP401_CONFIG_RANGE)
186 temp -= 64 * 256;
187
188 return DIV_ROUND_CLOSEST(temp * 125, 32);
189}
190
191static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
192{
193 if (config & TMP401_CONFIG_RANGE) {
194 temp = clamp_val(temp, -64000, 191000);
195 temp += 64000;
196 } else
197 temp = clamp_val(temp, 0, 127000);
198
199 return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
200}
201
202static int tmp401_update_device_reg16(struct i2c_client *client,
203 struct tmp401_data *data)
204{
205 int i, j, val;
206 int num_regs = data->kind == tmp411 ? 6 : 4;
207 int num_sensors = data->kind == tmp432 ? 3 : 2;
208
209 for (i = 0; i < num_sensors; i++) { /* local / r1 / r2 */
210 for (j = 0; j < num_regs; j++) { /* temp / low / ... */
211 u8 regaddr;
212 /*
213 * High byte must be read first immediately followed
214 * by the low byte
215 */
216 regaddr = data->kind == tmp432 ?
217 TMP432_TEMP_MSB_READ[j][i] :
218 TMP401_TEMP_MSB_READ[j][i];
219 val = i2c_smbus_read_byte_data(client, regaddr);
220 if (val < 0)
221 return val;
222 data->temp[j][i] = val << 8;
223 if (j == 3) /* crit is msb only */
224 continue;
225 regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[j][i]
226 : TMP401_TEMP_LSB[j][i];
227 val = i2c_smbus_read_byte_data(client, regaddr);
228 if (val < 0)
229 return val;
230 data->temp[j][i] |= val;
231 }
232 }
233 return 0;
234}
235
236static struct tmp401_data *tmp401_update_device(struct device *dev)
237{
238 struct tmp401_data *data = dev_get_drvdata(dev);
239 struct i2c_client *client = data->client;
240 struct tmp401_data *ret = data;
241 int i, val;
242 unsigned long next_update;
243
244 mutex_lock(&data->update_lock);
245
246 next_update = data->last_updated +
247 msecs_to_jiffies(data->update_interval);
248 if (time_after(jiffies, next_update) || !data->valid) {
249 if (data->kind != tmp432) {
250 /*
251 * The driver uses the TMP432 status format internally.
252 * Convert status to TMP432 format for other chips.
253 */
254 val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
255 if (val < 0) {
256 ret = ERR_PTR(val);
257 goto abort;
258 }
259 data->status[0] =
260 (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
261 data->status[1] =
262 ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
263 ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
264 data->status[2] =
265 ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
266 ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
267 data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
268 | TMP401_STATUS_REMOTE_CRIT);
269 } else {
270 for (i = 0; i < ARRAY_SIZE(data->status); i++) {
271 val = i2c_smbus_read_byte_data(client,
272 TMP432_STATUS_REG[i]);
273 if (val < 0) {
274 ret = ERR_PTR(val);
275 goto abort;
276 }
277 data->status[i] = val;
278 }
279 }
280
281 val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
282 if (val < 0) {
283 ret = ERR_PTR(val);
284 goto abort;
285 }
286 data->config = val;
287 val = tmp401_update_device_reg16(client, data);
288 if (val < 0) {
289 ret = ERR_PTR(val);
290 goto abort;
291 }
292 val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
293 if (val < 0) {
294 ret = ERR_PTR(val);
295 goto abort;
296 }
297 data->temp_crit_hyst = val;
298
299 data->last_updated = jiffies;
300 data->valid = 1;
301 }
302
303abort:
304 mutex_unlock(&data->update_lock);
305 return ret;
306}
307
308static ssize_t show_temp(struct device *dev,
309 struct device_attribute *devattr, char *buf)
310{
311 int nr = to_sensor_dev_attr_2(devattr)->nr;
312 int index = to_sensor_dev_attr_2(devattr)->index;
313 struct tmp401_data *data = tmp401_update_device(dev);
314
315 if (IS_ERR(data))
316 return PTR_ERR(data);
317
318 return sprintf(buf, "%d\n",
319 tmp401_register_to_temp(data->temp[nr][index], data->config));
320}
321
322static ssize_t show_temp_crit_hyst(struct device *dev,
323 struct device_attribute *devattr, char *buf)
324{
325 int temp, index = to_sensor_dev_attr(devattr)->index;
326 struct tmp401_data *data = tmp401_update_device(dev);
327
328 if (IS_ERR(data))
329 return PTR_ERR(data);
330
331 mutex_lock(&data->update_lock);
332 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
333 temp -= data->temp_crit_hyst * 1000;
334 mutex_unlock(&data->update_lock);
335
336 return sprintf(buf, "%d\n", temp);
337}
338
339static ssize_t show_status(struct device *dev,
340 struct device_attribute *devattr, char *buf)
341{
342 int nr = to_sensor_dev_attr_2(devattr)->nr;
343 int mask = to_sensor_dev_attr_2(devattr)->index;
344 struct tmp401_data *data = tmp401_update_device(dev);
345
346 if (IS_ERR(data))
347 return PTR_ERR(data);
348
349 return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
350}
351
352static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
353 const char *buf, size_t count)
354{
355 int nr = to_sensor_dev_attr_2(devattr)->nr;
356 int index = to_sensor_dev_attr_2(devattr)->index;
357 struct tmp401_data *data = dev_get_drvdata(dev);
358 struct i2c_client *client = data->client;
359 long val;
360 u16 reg;
361 u8 regaddr;
362
363 if (kstrtol(buf, 10, &val))
364 return -EINVAL;
365
366 reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
367
368 mutex_lock(&data->update_lock);
369
370 regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
371 : TMP401_TEMP_MSB_WRITE[nr][index];
372 i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
373 if (nr != 3) {
374 regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[nr][index]
375 : TMP401_TEMP_LSB[nr][index];
376 i2c_smbus_write_byte_data(client, regaddr, reg & 0xFF);
377 }
378 data->temp[nr][index] = reg;
379
380 mutex_unlock(&data->update_lock);
381
382 return count;
383}
384
385static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
386 *devattr, const char *buf, size_t count)
387{
388 int temp, index = to_sensor_dev_attr(devattr)->index;
389 struct tmp401_data *data = tmp401_update_device(dev);
390 long val;
391 u8 reg;
392
393 if (IS_ERR(data))
394 return PTR_ERR(data);
395
396 if (kstrtol(buf, 10, &val))
397 return -EINVAL;
398
399 if (data->config & TMP401_CONFIG_RANGE)
400 val = clamp_val(val, -64000, 191000);
401 else
402 val = clamp_val(val, 0, 127000);
403
404 mutex_lock(&data->update_lock);
405 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
406 val = clamp_val(val, temp - 255000, temp);
407 reg = ((temp - val) + 500) / 1000;
408
409 i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
410 reg);
411
412 data->temp_crit_hyst = reg;
413
414 mutex_unlock(&data->update_lock);
415
416 return count;
417}
418
419/*
420 * Resets the historical measurements of minimum and maximum temperatures.
421 * This is done by writing any value to any of the minimum/maximum registers
422 * (0x30-0x37).
423 */
424static ssize_t reset_temp_history(struct device *dev,
425 struct device_attribute *devattr, const char *buf, size_t count)
426{
427 struct tmp401_data *data = dev_get_drvdata(dev);
428 struct i2c_client *client = data->client;
429 long val;
430
431 if (kstrtol(buf, 10, &val))
432 return -EINVAL;
433
434 if (val != 1) {
435 dev_err(dev,
436 "temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
437 val);
438 return -EINVAL;
439 }
440 mutex_lock(&data->update_lock);
441 i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
442 data->valid = 0;
443 mutex_unlock(&data->update_lock);
444
445 return count;
446}
447
448static ssize_t show_update_interval(struct device *dev,
449 struct device_attribute *attr, char *buf)
450{
451 struct tmp401_data *data = dev_get_drvdata(dev);
452
453 return sprintf(buf, "%u\n", data->update_interval);
454}
455
456static ssize_t set_update_interval(struct device *dev,
457 struct device_attribute *attr,
458 const char *buf, size_t count)
459{
460 struct tmp401_data *data = dev_get_drvdata(dev);
461 struct i2c_client *client = data->client;
462 unsigned long val;
463 int err, rate;
464
465 err = kstrtoul(buf, 10, &val);
466 if (err)
467 return err;
468
469 /*
470 * For valid rates, interval can be calculated as
471 * interval = (1 << (7 - rate)) * 125;
472 * Rounded rate is therefore
473 * rate = 7 - __fls(interval * 4 / (125 * 3));
474 * Use clamp_val() to avoid overflows, and to ensure valid input
475 * for __fls.
476 */
477 val = clamp_val(val, 125, 16000);
478 rate = 7 - __fls(val * 4 / (125 * 3));
479 mutex_lock(&data->update_lock);
480 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
481 data->update_interval = (1 << (7 - rate)) * 125;
482 mutex_unlock(&data->update_lock);
483
484 return count;
485}
486
487static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
488static SENSOR_DEVICE_ATTR_2(temp1_min, S_IWUSR | S_IRUGO, show_temp,
489 store_temp, 1, 0);
490static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp,
491 store_temp, 2, 0);
492static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
493 store_temp, 3, 0);
494static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
495 show_temp_crit_hyst, store_temp_crit_hyst, 0);
496static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_status, NULL,
497 1, TMP432_STATUS_LOCAL);
498static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_status, NULL,
499 2, TMP432_STATUS_LOCAL);
500static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_status, NULL,
501 3, TMP432_STATUS_LOCAL);
502static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
503static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp,
504 store_temp, 1, 1);
505static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp,
506 store_temp, 2, 1);
507static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IWUSR | S_IRUGO, show_temp,
508 store_temp, 3, 1);
509static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst,
510 NULL, 1);
511static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_status, NULL,
512 0, TMP432_STATUS_REMOTE1);
513static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_status, NULL,
514 1, TMP432_STATUS_REMOTE1);
515static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_status, NULL,
516 2, TMP432_STATUS_REMOTE1);
517static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_status, NULL,
518 3, TMP432_STATUS_REMOTE1);
519
520static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
521 set_update_interval);
522
523static struct attribute *tmp401_attributes[] = {
524 &sensor_dev_attr_temp1_input.dev_attr.attr,
525 &sensor_dev_attr_temp1_min.dev_attr.attr,
526 &sensor_dev_attr_temp1_max.dev_attr.attr,
527 &sensor_dev_attr_temp1_crit.dev_attr.attr,
528 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
529 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
530 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
531 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
532
533 &sensor_dev_attr_temp2_input.dev_attr.attr,
534 &sensor_dev_attr_temp2_min.dev_attr.attr,
535 &sensor_dev_attr_temp2_max.dev_attr.attr,
536 &sensor_dev_attr_temp2_crit.dev_attr.attr,
537 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
538 &sensor_dev_attr_temp2_fault.dev_attr.attr,
539 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
540 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
541 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
542
543 &dev_attr_update_interval.attr,
544
545 NULL
546};
547
548static const struct attribute_group tmp401_group = {
549 .attrs = tmp401_attributes,
550};
551
552/*
553 * Additional features of the TMP411 chip.
554 * The TMP411 stores the minimum and maximum
555 * temperature measured since power-on, chip-reset, or
556 * minimum and maximum register reset for both the local
557 * and remote channels.
558 */
559static SENSOR_DEVICE_ATTR_2(temp1_lowest, S_IRUGO, show_temp, NULL, 4, 0);
560static SENSOR_DEVICE_ATTR_2(temp1_highest, S_IRUGO, show_temp, NULL, 5, 0);
561static SENSOR_DEVICE_ATTR_2(temp2_lowest, S_IRUGO, show_temp, NULL, 4, 1);
562static SENSOR_DEVICE_ATTR_2(temp2_highest, S_IRUGO, show_temp, NULL, 5, 1);
563static SENSOR_DEVICE_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history,
564 0);
565
566static struct attribute *tmp411_attributes[] = {
567 &sensor_dev_attr_temp1_highest.dev_attr.attr,
568 &sensor_dev_attr_temp1_lowest.dev_attr.attr,
569 &sensor_dev_attr_temp2_highest.dev_attr.attr,
570 &sensor_dev_attr_temp2_lowest.dev_attr.attr,
571 &sensor_dev_attr_temp_reset_history.dev_attr.attr,
572 NULL
573};
574
575static const struct attribute_group tmp411_group = {
576 .attrs = tmp411_attributes,
577};
578
579static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0, 2);
580static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp,
581 store_temp, 1, 2);
582static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp,
583 store_temp, 2, 2);
584static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
585 store_temp, 3, 2);
586static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temp_crit_hyst,
587 NULL, 2);
588static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_status, NULL,
589 0, TMP432_STATUS_REMOTE2);
590static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_status, NULL,
591 1, TMP432_STATUS_REMOTE2);
592static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_status, NULL,
593 2, TMP432_STATUS_REMOTE2);
594static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_status, NULL,
595 3, TMP432_STATUS_REMOTE2);
596
597static struct attribute *tmp432_attributes[] = {
598 &sensor_dev_attr_temp3_input.dev_attr.attr,
599 &sensor_dev_attr_temp3_min.dev_attr.attr,
600 &sensor_dev_attr_temp3_max.dev_attr.attr,
601 &sensor_dev_attr_temp3_crit.dev_attr.attr,
602 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
603 &sensor_dev_attr_temp3_fault.dev_attr.attr,
604 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
605 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
606 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
607
608 NULL
609};
610
611static const struct attribute_group tmp432_group = {
612 .attrs = tmp432_attributes,
613};
614
615/*
616 * Begin non sysfs callback code (aka Real code)
617 */
618
619static int tmp401_init_client(struct tmp401_data *data,
620 struct i2c_client *client)
621{
622 int config, config_orig, status = 0;
623
624 /* Set the conversion rate to 2 Hz */
625 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
626 data->update_interval = 500;
627
628 /* Start conversions (disable shutdown if necessary) */
629 config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
630 if (config < 0)
631 return config;
632
633 config_orig = config;
634 config &= ~TMP401_CONFIG_SHUTDOWN;
635
636 if (config != config_orig)
637 status = i2c_smbus_write_byte_data(client,
638 TMP401_CONFIG_WRITE,
639 config);
640
641 return status;
642}
643
644static int tmp401_detect(struct i2c_client *client,
645 struct i2c_board_info *info)
646{
647 enum chips kind;
648 struct i2c_adapter *adapter = client->adapter;
649 u8 reg;
650
651 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
652 return -ENODEV;
653
654 /* Detect and identify the chip */
655 reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
656 if (reg != TMP401_MANUFACTURER_ID)
657 return -ENODEV;
658
659 reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
660
661 switch (reg) {
662 case TMP401_DEVICE_ID:
663 if (client->addr != 0x4c)
664 return -ENODEV;
665 kind = tmp401;
666 break;
667 case TMP411A_DEVICE_ID:
668 if (client->addr != 0x4c)
669 return -ENODEV;
670 kind = tmp411;
671 break;
672 case TMP411B_DEVICE_ID:
673 if (client->addr != 0x4d)
674 return -ENODEV;
675 kind = tmp411;
676 break;
677 case TMP411C_DEVICE_ID:
678 if (client->addr != 0x4e)
679 return -ENODEV;
680 kind = tmp411;
681 break;
682 case TMP431_DEVICE_ID:
683 if (client->addr != 0x4c && client->addr != 0x4d)
684 return -ENODEV;
685 kind = tmp431;
686 break;
687 case TMP432_DEVICE_ID:
688 if (client->addr != 0x4c && client->addr != 0x4d)
689 return -ENODEV;
690 kind = tmp432;
691 break;
692 case TMP435_DEVICE_ID:
693 kind = tmp435;
694 break;
695 default:
696 return -ENODEV;
697 }
698
699 reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
700 if (reg & 0x1b)
701 return -ENODEV;
702
703 reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
704 /* Datasheet says: 0x1-0x6 */
705 if (reg > 15)
706 return -ENODEV;
707
708 strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
709
710 return 0;
711}
712
713static int tmp401_probe(struct i2c_client *client,
714 const struct i2c_device_id *id)
715{
716 static const char * const names[] = {
717 "TMP401", "TMP411", "TMP431", "TMP432", "TMP435"
718 };
719 struct device *dev = &client->dev;
720 struct device *hwmon_dev;
721 struct tmp401_data *data;
722 int groups = 0, status;
723
724 data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
725 if (!data)
726 return -ENOMEM;
727
728 data->client = client;
729 mutex_init(&data->update_lock);
730 data->kind = id->driver_data;
731
732 /* Initialize the TMP401 chip */
733 status = tmp401_init_client(data, client);
734 if (status < 0)
735 return status;
736
737 /* Register sysfs hooks */
738 data->groups[groups++] = &tmp401_group;
739
740 /* Register additional tmp411 sysfs hooks */
741 if (data->kind == tmp411)
742 data->groups[groups++] = &tmp411_group;
743
744 /* Register additional tmp432 sysfs hooks */
745 if (data->kind == tmp432)
746 data->groups[groups++] = &tmp432_group;
747
748 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
749 data, data->groups);
750 if (IS_ERR(hwmon_dev))
751 return PTR_ERR(hwmon_dev);
752
753 dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
754
755 return 0;
756}
757
758static struct i2c_driver tmp401_driver = {
759 .class = I2C_CLASS_HWMON,
760 .driver = {
761 .name = "tmp401",
762 },
763 .probe = tmp401_probe,
764 .id_table = tmp401_id,
765 .detect = tmp401_detect,
766 .address_list = normal_i2c,
767};
768
769module_i2c_driver(tmp401_driver);
770
771MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
772MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
773MODULE_LICENSE("GPL");