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>
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.
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.
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.
24 * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
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.
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>
42 /* Addresses to scan */
43 static const unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END };
45 enum chips { tmp401, tmp411 };
48 * The TMP401 registers, note some registers have different addresses for
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
62 static const u8 TMP401_TEMP_MSB[2] = { 0x00, 0x01 };
63 static const u8 TMP401_TEMP_LSB[2] = { 0x15, 0x10 };
64 static const u8 TMP401_TEMP_LOW_LIMIT_MSB_READ[2] = { 0x06, 0x08 };
65 static const u8 TMP401_TEMP_LOW_LIMIT_MSB_WRITE[2] = { 0x0C, 0x0E };
66 static const u8 TMP401_TEMP_LOW_LIMIT_LSB[2] = { 0x17, 0x14 };
67 static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_READ[2] = { 0x05, 0x07 };
68 static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[2] = { 0x0B, 0x0D };
69 static const u8 TMP401_TEMP_HIGH_LIMIT_LSB[2] = { 0x16, 0x13 };
70 /* These are called the THERM limit / hysteresis / mask in the datasheet */
71 static const u8 TMP401_TEMP_CRIT_LIMIT[2] = { 0x20, 0x19 };
73 static const u8 TMP411_TEMP_LOWEST_MSB[2] = { 0x30, 0x34 };
74 static const u8 TMP411_TEMP_LOWEST_LSB[2] = { 0x31, 0x35 };
75 static const u8 TMP411_TEMP_HIGHEST_MSB[2] = { 0x32, 0x36 };
76 static const u8 TMP411_TEMP_HIGHEST_LSB[2] = { 0x33, 0x37 };
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
89 /* Manufacturer / Device ID's */
90 #define TMP401_MANUFACTURER_ID 0x55
91 #define TMP401_DEVICE_ID 0x11
92 #define TMP411_DEVICE_ID 0x12
95 * Functions declarations
98 static int tmp401_probe(struct i2c_client *client,
99 const struct i2c_device_id *id);
100 static int tmp401_detect(struct i2c_client *client,
101 struct i2c_board_info *info);
102 static int tmp401_remove(struct i2c_client *client);
103 static struct tmp401_data *tmp401_update_device(struct device *dev);
106 * Driver data (common to all clients)
109 static const struct i2c_device_id tmp401_id[] = {
110 { "tmp401", tmp401 },
111 { "tmp411", tmp411 },
114 MODULE_DEVICE_TABLE(i2c, tmp401_id);
116 static struct i2c_driver tmp401_driver = {
117 .class = I2C_CLASS_HWMON,
121 .probe = tmp401_probe,
122 .remove = tmp401_remove,
123 .id_table = tmp401_id,
124 .detect = tmp401_detect,
125 .address_list = normal_i2c,
129 * Client data (each client gets its own)
133 struct device *hwmon_dev;
134 struct mutex update_lock;
135 char valid; /* zero until following fields are valid */
136 unsigned long last_updated; /* in jiffies */
139 /* register values */
152 * Sysfs attr show / store functions
155 static int tmp401_register_to_temp(u16 reg, u8 config)
159 if (config & TMP401_CONFIG_RANGE)
162 return (temp * 625 + 80) / 160;
165 static u16 tmp401_temp_to_register(long temp, u8 config)
167 if (config & TMP401_CONFIG_RANGE) {
168 temp = SENSORS_LIMIT(temp, -64000, 191000);
171 temp = SENSORS_LIMIT(temp, 0, 127000);
173 return (temp * 160 + 312) / 625;
176 static int tmp401_crit_register_to_temp(u8 reg, u8 config)
180 if (config & TMP401_CONFIG_RANGE)
186 static u8 tmp401_crit_temp_to_register(long temp, u8 config)
188 if (config & TMP401_CONFIG_RANGE) {
189 temp = SENSORS_LIMIT(temp, -64000, 191000);
192 temp = SENSORS_LIMIT(temp, 0, 127000);
194 return (temp + 500) / 1000;
197 static ssize_t show_temp_value(struct device *dev,
198 struct device_attribute *devattr, char *buf)
200 int index = to_sensor_dev_attr(devattr)->index;
201 struct tmp401_data *data = tmp401_update_device(dev);
203 return sprintf(buf, "%d\n",
204 tmp401_register_to_temp(data->temp[index], data->config));
207 static ssize_t show_temp_min(struct device *dev,
208 struct device_attribute *devattr, char *buf)
210 int index = to_sensor_dev_attr(devattr)->index;
211 struct tmp401_data *data = tmp401_update_device(dev);
213 return sprintf(buf, "%d\n",
214 tmp401_register_to_temp(data->temp_low[index], data->config));
217 static ssize_t show_temp_max(struct device *dev,
218 struct device_attribute *devattr, char *buf)
220 int index = to_sensor_dev_attr(devattr)->index;
221 struct tmp401_data *data = tmp401_update_device(dev);
223 return sprintf(buf, "%d\n",
224 tmp401_register_to_temp(data->temp_high[index], data->config));
227 static ssize_t show_temp_crit(struct device *dev,
228 struct device_attribute *devattr, char *buf)
230 int index = to_sensor_dev_attr(devattr)->index;
231 struct tmp401_data *data = tmp401_update_device(dev);
233 return sprintf(buf, "%d\n",
234 tmp401_crit_register_to_temp(data->temp_crit[index],
238 static ssize_t show_temp_crit_hyst(struct device *dev,
239 struct device_attribute *devattr, char *buf)
241 int temp, index = to_sensor_dev_attr(devattr)->index;
242 struct tmp401_data *data = tmp401_update_device(dev);
244 mutex_lock(&data->update_lock);
245 temp = tmp401_crit_register_to_temp(data->temp_crit[index],
247 temp -= data->temp_crit_hyst * 1000;
248 mutex_unlock(&data->update_lock);
250 return sprintf(buf, "%d\n", temp);
253 static ssize_t show_temp_lowest(struct device *dev,
254 struct device_attribute *devattr, char *buf)
256 int index = to_sensor_dev_attr(devattr)->index;
257 struct tmp401_data *data = tmp401_update_device(dev);
259 return sprintf(buf, "%d\n",
260 tmp401_register_to_temp(data->temp_lowest[index],
264 static ssize_t show_temp_highest(struct device *dev,
265 struct device_attribute *devattr, char *buf)
267 int index = to_sensor_dev_attr(devattr)->index;
268 struct tmp401_data *data = tmp401_update_device(dev);
270 return sprintf(buf, "%d\n",
271 tmp401_register_to_temp(data->temp_highest[index],
275 static ssize_t show_status(struct device *dev,
276 struct device_attribute *devattr, char *buf)
278 int mask = to_sensor_dev_attr(devattr)->index;
279 struct tmp401_data *data = tmp401_update_device(dev);
281 if (data->status & mask)
282 return sprintf(buf, "1\n");
284 return sprintf(buf, "0\n");
287 static ssize_t store_temp_min(struct device *dev, struct device_attribute
288 *devattr, const char *buf, size_t count)
290 int index = to_sensor_dev_attr(devattr)->index;
291 struct tmp401_data *data = tmp401_update_device(dev);
295 if (strict_strtol(buf, 10, &val))
298 reg = tmp401_temp_to_register(val, data->config);
300 mutex_lock(&data->update_lock);
302 i2c_smbus_write_byte_data(to_i2c_client(dev),
303 TMP401_TEMP_LOW_LIMIT_MSB_WRITE[index], reg >> 8);
304 i2c_smbus_write_byte_data(to_i2c_client(dev),
305 TMP401_TEMP_LOW_LIMIT_LSB[index], reg & 0xFF);
307 data->temp_low[index] = reg;
309 mutex_unlock(&data->update_lock);
314 static ssize_t store_temp_max(struct device *dev, struct device_attribute
315 *devattr, const char *buf, size_t count)
317 int index = to_sensor_dev_attr(devattr)->index;
318 struct tmp401_data *data = tmp401_update_device(dev);
322 if (strict_strtol(buf, 10, &val))
325 reg = tmp401_temp_to_register(val, data->config);
327 mutex_lock(&data->update_lock);
329 i2c_smbus_write_byte_data(to_i2c_client(dev),
330 TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[index], reg >> 8);
331 i2c_smbus_write_byte_data(to_i2c_client(dev),
332 TMP401_TEMP_HIGH_LIMIT_LSB[index], reg & 0xFF);
334 data->temp_high[index] = reg;
336 mutex_unlock(&data->update_lock);
341 static ssize_t store_temp_crit(struct device *dev, struct device_attribute
342 *devattr, const char *buf, size_t count)
344 int index = to_sensor_dev_attr(devattr)->index;
345 struct tmp401_data *data = tmp401_update_device(dev);
349 if (strict_strtol(buf, 10, &val))
352 reg = tmp401_crit_temp_to_register(val, data->config);
354 mutex_lock(&data->update_lock);
356 i2c_smbus_write_byte_data(to_i2c_client(dev),
357 TMP401_TEMP_CRIT_LIMIT[index], reg);
359 data->temp_crit[index] = reg;
361 mutex_unlock(&data->update_lock);
366 static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
367 *devattr, const char *buf, size_t count)
369 int temp, index = to_sensor_dev_attr(devattr)->index;
370 struct tmp401_data *data = tmp401_update_device(dev);
374 if (strict_strtol(buf, 10, &val))
377 if (data->config & TMP401_CONFIG_RANGE)
378 val = SENSORS_LIMIT(val, -64000, 191000);
380 val = SENSORS_LIMIT(val, 0, 127000);
382 mutex_lock(&data->update_lock);
383 temp = tmp401_crit_register_to_temp(data->temp_crit[index],
385 val = SENSORS_LIMIT(val, temp - 255000, temp);
386 reg = ((temp - val) + 500) / 1000;
388 i2c_smbus_write_byte_data(to_i2c_client(dev),
389 TMP401_TEMP_CRIT_HYST, reg);
391 data->temp_crit_hyst = reg;
393 mutex_unlock(&data->update_lock);
399 * Resets the historical measurements of minimum and maximum temperatures.
400 * This is done by writing any value to any of the minimum/maximum registers
403 static ssize_t reset_temp_history(struct device *dev,
404 struct device_attribute *devattr, const char *buf, size_t count)
408 if (strict_strtol(buf, 10, &val))
412 dev_err(dev, "temp_reset_history value %ld not"
413 " supported. Use 1 to reset the history!\n", val);
416 i2c_smbus_write_byte_data(to_i2c_client(dev),
417 TMP411_TEMP_LOWEST_MSB[0], val);
422 static struct sensor_device_attribute tmp401_attr[] = {
423 SENSOR_ATTR(temp1_input, 0444, show_temp_value, NULL, 0),
424 SENSOR_ATTR(temp1_min, 0644, show_temp_min, store_temp_min, 0),
425 SENSOR_ATTR(temp1_max, 0644, show_temp_max, store_temp_max, 0),
426 SENSOR_ATTR(temp1_crit, 0644, show_temp_crit, store_temp_crit, 0),
427 SENSOR_ATTR(temp1_crit_hyst, 0644, show_temp_crit_hyst,
428 store_temp_crit_hyst, 0),
429 SENSOR_ATTR(temp1_min_alarm, 0444, show_status, NULL,
430 TMP401_STATUS_LOCAL_LOW),
431 SENSOR_ATTR(temp1_max_alarm, 0444, show_status, NULL,
432 TMP401_STATUS_LOCAL_HIGH),
433 SENSOR_ATTR(temp1_crit_alarm, 0444, show_status, NULL,
434 TMP401_STATUS_LOCAL_CRIT),
435 SENSOR_ATTR(temp2_input, 0444, show_temp_value, NULL, 1),
436 SENSOR_ATTR(temp2_min, 0644, show_temp_min, store_temp_min, 1),
437 SENSOR_ATTR(temp2_max, 0644, show_temp_max, store_temp_max, 1),
438 SENSOR_ATTR(temp2_crit, 0644, show_temp_crit, store_temp_crit, 1),
439 SENSOR_ATTR(temp2_crit_hyst, 0444, show_temp_crit_hyst, NULL, 1),
440 SENSOR_ATTR(temp2_fault, 0444, show_status, NULL,
441 TMP401_STATUS_REMOTE_OPEN),
442 SENSOR_ATTR(temp2_min_alarm, 0444, show_status, NULL,
443 TMP401_STATUS_REMOTE_LOW),
444 SENSOR_ATTR(temp2_max_alarm, 0444, show_status, NULL,
445 TMP401_STATUS_REMOTE_HIGH),
446 SENSOR_ATTR(temp2_crit_alarm, 0444, show_status, NULL,
447 TMP401_STATUS_REMOTE_CRIT),
451 * Additional features of the TMP411 chip.
452 * The TMP411 stores the minimum and maximum
453 * temperature measured since power-on, chip-reset, or
454 * minimum and maximum register reset for both the local
455 * and remote channels.
457 static struct sensor_device_attribute tmp411_attr[] = {
458 SENSOR_ATTR(temp1_highest, 0444, show_temp_highest, NULL, 0),
459 SENSOR_ATTR(temp1_lowest, 0444, show_temp_lowest, NULL, 0),
460 SENSOR_ATTR(temp2_highest, 0444, show_temp_highest, NULL, 1),
461 SENSOR_ATTR(temp2_lowest, 0444, show_temp_lowest, NULL, 1),
462 SENSOR_ATTR(temp_reset_history, 0200, NULL, reset_temp_history, 0),
466 * Begin non sysfs callback code (aka Real code)
469 static void tmp401_init_client(struct i2c_client *client)
471 int config, config_orig;
473 /* Set the conversion rate to 2 Hz */
474 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
476 /* Start conversions (disable shutdown if necessary) */
477 config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
479 dev_warn(&client->dev, "Initialization failed!\n");
483 config_orig = config;
484 config &= ~TMP401_CONFIG_SHUTDOWN;
486 if (config != config_orig)
487 i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config);
490 static int tmp401_detect(struct i2c_client *client,
491 struct i2c_board_info *info)
494 struct i2c_adapter *adapter = client->adapter;
497 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
500 /* Detect and identify the chip */
501 reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
502 if (reg != TMP401_MANUFACTURER_ID)
505 reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
508 case TMP401_DEVICE_ID:
511 case TMP411_DEVICE_ID:
518 reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
522 reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
523 /* Datasheet says: 0x1-0x6 */
527 strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
532 static int tmp401_probe(struct i2c_client *client,
533 const struct i2c_device_id *id)
536 struct tmp401_data *data;
537 const char *names[] = { "TMP401", "TMP411" };
539 data = kzalloc(sizeof(struct tmp401_data), GFP_KERNEL);
543 i2c_set_clientdata(client, data);
544 mutex_init(&data->update_lock);
545 data->kind = id->driver_data;
547 /* Initialize the TMP401 chip */
548 tmp401_init_client(client);
550 /* Register sysfs hooks */
551 for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++) {
552 err = device_create_file(&client->dev,
553 &tmp401_attr[i].dev_attr);
558 /* Register aditional tmp411 sysfs hooks */
559 if (data->kind == tmp411) {
560 for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++) {
561 err = device_create_file(&client->dev,
562 &tmp411_attr[i].dev_attr);
568 data->hwmon_dev = hwmon_device_register(&client->dev);
569 if (IS_ERR(data->hwmon_dev)) {
570 err = PTR_ERR(data->hwmon_dev);
571 data->hwmon_dev = NULL;
575 dev_info(&client->dev, "Detected TI %s chip\n", names[data->kind]);
580 tmp401_remove(client); /* will also free data for us */
584 static int tmp401_remove(struct i2c_client *client)
586 struct tmp401_data *data = i2c_get_clientdata(client);
590 hwmon_device_unregister(data->hwmon_dev);
592 for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++)
593 device_remove_file(&client->dev, &tmp401_attr[i].dev_attr);
595 if (data->kind == tmp411) {
596 for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++)
597 device_remove_file(&client->dev,
598 &tmp411_attr[i].dev_attr);
605 static struct tmp401_data *tmp401_update_device_reg16(
606 struct i2c_client *client, struct tmp401_data *data)
610 for (i = 0; i < 2; i++) {
612 * High byte must be read first immediately followed
615 data->temp[i] = i2c_smbus_read_byte_data(client,
616 TMP401_TEMP_MSB[i]) << 8;
617 data->temp[i] |= i2c_smbus_read_byte_data(client,
619 data->temp_low[i] = i2c_smbus_read_byte_data(client,
620 TMP401_TEMP_LOW_LIMIT_MSB_READ[i]) << 8;
621 data->temp_low[i] |= i2c_smbus_read_byte_data(client,
622 TMP401_TEMP_LOW_LIMIT_LSB[i]);
623 data->temp_high[i] = i2c_smbus_read_byte_data(client,
624 TMP401_TEMP_HIGH_LIMIT_MSB_READ[i]) << 8;
625 data->temp_high[i] |= i2c_smbus_read_byte_data(client,
626 TMP401_TEMP_HIGH_LIMIT_LSB[i]);
627 data->temp_crit[i] = i2c_smbus_read_byte_data(client,
628 TMP401_TEMP_CRIT_LIMIT[i]);
630 if (data->kind == tmp411) {
631 data->temp_lowest[i] = i2c_smbus_read_byte_data(client,
632 TMP411_TEMP_LOWEST_MSB[i]) << 8;
633 data->temp_lowest[i] |= i2c_smbus_read_byte_data(
634 client, TMP411_TEMP_LOWEST_LSB[i]);
636 data->temp_highest[i] = i2c_smbus_read_byte_data(
637 client, TMP411_TEMP_HIGHEST_MSB[i]) << 8;
638 data->temp_highest[i] |= i2c_smbus_read_byte_data(
639 client, TMP411_TEMP_HIGHEST_LSB[i]);
645 static struct tmp401_data *tmp401_update_device(struct device *dev)
647 struct i2c_client *client = to_i2c_client(dev);
648 struct tmp401_data *data = i2c_get_clientdata(client);
650 mutex_lock(&data->update_lock);
652 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
653 data->status = i2c_smbus_read_byte_data(client, TMP401_STATUS);
654 data->config = i2c_smbus_read_byte_data(client,
656 tmp401_update_device_reg16(client, data);
658 data->temp_crit_hyst = i2c_smbus_read_byte_data(client,
659 TMP401_TEMP_CRIT_HYST);
661 data->last_updated = jiffies;
665 mutex_unlock(&data->update_lock);
670 static int __init tmp401_init(void)
672 return i2c_add_driver(&tmp401_driver);
675 static void __exit tmp401_exit(void)
677 i2c_del_driver(&tmp401_driver);
680 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
681 MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
682 MODULE_LICENSE("GPL");
684 module_init(tmp401_init);
685 module_exit(tmp401_exit);