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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[] = { 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");