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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
43static const unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END };
44
45enum chips { tmp401, tmp411 };
46
47
48
49
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
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
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
90#define TMP401_MANUFACTURER_ID 0x55
91#define TMP401_DEVICE_ID 0x11
92#define TMP411_DEVICE_ID 0x12
93
94
95
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
107
108
109struct tmp401_data {
110 struct device *hwmon_dev;
111 struct mutex update_lock;
112 char valid;
113 unsigned long last_updated;
114 enum chips kind;
115
116
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
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
182
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
442
443
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
500
501
502
503
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
515
516
517static void tmp401_init_client(struct i2c_client *client)
518{
519 int config, config_orig;
520
521
522 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
523
524
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
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
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
617 tmp401_init_client(client);
618
619
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
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);
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);
681
