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 */ 43 static const unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END }; 44 45 /* Insmod parameters */ 46 I2C_CLIENT_INSMOD_2(tmp401, tmp411); 47 48 /* 49 * The TMP401 registers, note some registers have different addresses for 50 * reading and writing 51 */ 52 #define TMP401_STATUS 0x02 53 #define TMP401_CONFIG_READ 0x03 54 #define TMP401_CONFIG_WRITE 0x09 55 #define TMP401_CONVERSION_RATE_READ 0x04 56 #define TMP401_CONVERSION_RATE_WRITE 0x0A 57 #define TMP401_TEMP_CRIT_HYST 0x21 58 #define TMP401_CONSECUTIVE_ALERT 0x22 59 #define TMP401_MANUFACTURER_ID_REG 0xFE 60 #define TMP401_DEVICE_ID_REG 0xFF 61 #define TMP411_N_FACTOR_REG 0x18 62 63 static const u8 TMP401_TEMP_MSB[2] = { 0x00, 0x01 }; 64 static const u8 TMP401_TEMP_LSB[2] = { 0x15, 0x10 }; 65 static const u8 TMP401_TEMP_LOW_LIMIT_MSB_READ[2] = { 0x06, 0x08 }; 66 static const u8 TMP401_TEMP_LOW_LIMIT_MSB_WRITE[2] = { 0x0C, 0x0E }; 67 static const u8 TMP401_TEMP_LOW_LIMIT_LSB[2] = { 0x17, 0x14 }; 68 static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_READ[2] = { 0x05, 0x07 }; 69 static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[2] = { 0x0B, 0x0D }; 70 static const u8 TMP401_TEMP_HIGH_LIMIT_LSB[2] = { 0x16, 0x13 }; 71 /* These are called the THERM limit / hysteresis / mask in the datasheet */ 72 static const u8 TMP401_TEMP_CRIT_LIMIT[2] = { 0x20, 0x19 }; 73 74 static const u8 TMP411_TEMP_LOWEST_MSB[2] = { 0x30, 0x34 }; 75 static const u8 TMP411_TEMP_LOWEST_LSB[2] = { 0x31, 0x35 }; 76 static const u8 TMP411_TEMP_HIGHEST_MSB[2] = { 0x32, 0x36 }; 77 static const u8 TMP411_TEMP_HIGHEST_LSB[2] = { 0x33, 0x37 }; 78 79 /* Flags */ 80 #define TMP401_CONFIG_RANGE 0x04 81 #define TMP401_CONFIG_SHUTDOWN 0x40 82 #define TMP401_STATUS_LOCAL_CRIT 0x01 83 #define TMP401_STATUS_REMOTE_CRIT 0x02 84 #define TMP401_STATUS_REMOTE_OPEN 0x04 85 #define TMP401_STATUS_REMOTE_LOW 0x08 86 #define TMP401_STATUS_REMOTE_HIGH 0x10 87 #define TMP401_STATUS_LOCAL_LOW 0x20 88 #define TMP401_STATUS_LOCAL_HIGH 0x40 89 90 /* Manufacturer / Device ID's */ 91 #define TMP401_MANUFACTURER_ID 0x55 92 #define TMP401_DEVICE_ID 0x11 93 #define TMP411_DEVICE_ID 0x12 94 95 /* 96 * Functions declarations 97 */ 98 99 static int tmp401_probe(struct i2c_client *client, 100 const struct i2c_device_id *id); 101 static int tmp401_detect(struct i2c_client *client, int kind, 102 struct i2c_board_info *info); 103 static int tmp401_remove(struct i2c_client *client); 104 static struct tmp401_data *tmp401_update_device(struct device *dev); 105 106 /* 107 * Driver data (common to all clients) 108 */ 109 110 static const struct i2c_device_id tmp401_id[] = { 111 { "tmp401", tmp401 }, 112 { "tmp411", tmp411 }, 113 { } 114 }; 115 MODULE_DEVICE_TABLE(i2c, tmp401_id); 116 117 static struct i2c_driver tmp401_driver = { 118 .class = I2C_CLASS_HWMON, 119 .driver = { 120 .name = "tmp401", 121 }, 122 .probe = tmp401_probe, 123 .remove = tmp401_remove, 124 .id_table = tmp401_id, 125 .detect = tmp401_detect, 126 .address_data = &addr_data, 127 }; 128 129 /* 130 * Client data (each client gets its own) 131 */ 132 133 struct tmp401_data { 134 struct device *hwmon_dev; 135 struct mutex update_lock; 136 char valid; /* zero until following fields are valid */ 137 unsigned long last_updated; /* in jiffies */ 138 int kind; 139 140 /* register values */ 141 u8 status; 142 u8 config; 143 u16 temp[2]; 144 u16 temp_low[2]; 145 u16 temp_high[2]; 146 u8 temp_crit[2]; 147 u8 temp_crit_hyst; 148 u16 temp_lowest[2]; 149 u16 temp_highest[2]; 150 }; 151 152 /* 153 * Sysfs attr show / store functions 154 */ 155 156 static int tmp401_register_to_temp(u16 reg, u8 config) 157 { 158 int temp = reg; 159 160 if (config & TMP401_CONFIG_RANGE) 161 temp -= 64 * 256; 162 163 return (temp * 625 + 80) / 160; 164 } 165 166 static u16 tmp401_temp_to_register(long temp, u8 config) 167 { 168 if (config & TMP401_CONFIG_RANGE) { 169 temp = SENSORS_LIMIT(temp, -64000, 191000); 170 temp += 64000; 171 } else 172 temp = SENSORS_LIMIT(temp, 0, 127000); 173 174 return (temp * 160 + 312) / 625; 175 } 176 177 static int tmp401_crit_register_to_temp(u8 reg, u8 config) 178 { 179 int temp = reg; 180 181 if (config & TMP401_CONFIG_RANGE) 182 temp -= 64; 183 184 return temp * 1000; 185 } 186 187 static u8 tmp401_crit_temp_to_register(long temp, u8 config) 188 { 189 if (config & TMP401_CONFIG_RANGE) { 190 temp = SENSORS_LIMIT(temp, -64000, 191000); 191 temp += 64000; 192 } else 193 temp = SENSORS_LIMIT(temp, 0, 127000); 194 195 return (temp + 500) / 1000; 196 } 197 198 static ssize_t show_temp_value(struct device *dev, 199 struct device_attribute *devattr, char *buf) 200 { 201 int index = to_sensor_dev_attr(devattr)->index; 202 struct tmp401_data *data = tmp401_update_device(dev); 203 204 return sprintf(buf, "%d\n", 205 tmp401_register_to_temp(data->temp[index], data->config)); 206 } 207 208 static ssize_t show_temp_min(struct device *dev, 209 struct device_attribute *devattr, char *buf) 210 { 211 int index = to_sensor_dev_attr(devattr)->index; 212 struct tmp401_data *data = tmp401_update_device(dev); 213 214 return sprintf(buf, "%d\n", 215 tmp401_register_to_temp(data->temp_low[index], data->config)); 216 } 217 218 static ssize_t show_temp_max(struct device *dev, 219 struct device_attribute *devattr, char *buf) 220 { 221 int index = to_sensor_dev_attr(devattr)->index; 222 struct tmp401_data *data = tmp401_update_device(dev); 223 224 return sprintf(buf, "%d\n", 225 tmp401_register_to_temp(data->temp_high[index], data->config)); 226 } 227 228 static ssize_t show_temp_crit(struct device *dev, 229 struct device_attribute *devattr, char *buf) 230 { 231 int index = to_sensor_dev_attr(devattr)->index; 232 struct tmp401_data *data = tmp401_update_device(dev); 233 234 return sprintf(buf, "%d\n", 235 tmp401_crit_register_to_temp(data->temp_crit[index], 236 data->config)); 237 } 238 239 static ssize_t show_temp_crit_hyst(struct device *dev, 240 struct device_attribute *devattr, char *buf) 241 { 242 int temp, index = to_sensor_dev_attr(devattr)->index; 243 struct tmp401_data *data = tmp401_update_device(dev); 244 245 mutex_lock(&data->update_lock); 246 temp = tmp401_crit_register_to_temp(data->temp_crit[index], 247 data->config); 248 temp -= data->temp_crit_hyst * 1000; 249 mutex_unlock(&data->update_lock); 250 251 return sprintf(buf, "%d\n", temp); 252 } 253 254 static ssize_t show_temp_lowest(struct device *dev, 255 struct device_attribute *devattr, char *buf) 256 { 257 int index = to_sensor_dev_attr(devattr)->index; 258 struct tmp401_data *data = tmp401_update_device(dev); 259 260 return sprintf(buf, "%d\n", 261 tmp401_register_to_temp(data->temp_lowest[index], 262 data->config)); 263 } 264 265 static ssize_t show_temp_highest(struct device *dev, 266 struct device_attribute *devattr, char *buf) 267 { 268 int index = to_sensor_dev_attr(devattr)->index; 269 struct tmp401_data *data = tmp401_update_device(dev); 270 271 return sprintf(buf, "%d\n", 272 tmp401_register_to_temp(data->temp_highest[index], 273 data->config)); 274 } 275 276 static ssize_t show_status(struct device *dev, 277 struct device_attribute *devattr, char *buf) 278 { 279 int mask = to_sensor_dev_attr(devattr)->index; 280 struct tmp401_data *data = tmp401_update_device(dev); 281 282 if (data->status & mask) 283 return sprintf(buf, "1\n"); 284 else 285 return sprintf(buf, "0\n"); 286 } 287 288 static ssize_t store_temp_min(struct device *dev, struct device_attribute 289 *devattr, const char *buf, size_t count) 290 { 291 int index = to_sensor_dev_attr(devattr)->index; 292 struct tmp401_data *data = tmp401_update_device(dev); 293 long val; 294 u16 reg; 295 296 if (strict_strtol(buf, 10, &val)) 297 return -EINVAL; 298 299 reg = tmp401_temp_to_register(val, data->config); 300 301 mutex_lock(&data->update_lock); 302 303 i2c_smbus_write_byte_data(to_i2c_client(dev), 304 TMP401_TEMP_LOW_LIMIT_MSB_WRITE[index], reg >> 8); 305 i2c_smbus_write_byte_data(to_i2c_client(dev), 306 TMP401_TEMP_LOW_LIMIT_LSB[index], reg & 0xFF); 307 308 data->temp_low[index] = reg; 309 310 mutex_unlock(&data->update_lock); 311 312 return count; 313 } 314 315 static ssize_t store_temp_max(struct device *dev, struct device_attribute 316 *devattr, const char *buf, size_t count) 317 { 318 int index = to_sensor_dev_attr(devattr)->index; 319 struct tmp401_data *data = tmp401_update_device(dev); 320 long val; 321 u16 reg; 322 323 if (strict_strtol(buf, 10, &val)) 324 return -EINVAL; 325 326 reg = tmp401_temp_to_register(val, data->config); 327 328 mutex_lock(&data->update_lock); 329 330 i2c_smbus_write_byte_data(to_i2c_client(dev), 331 TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[index], reg >> 8); 332 i2c_smbus_write_byte_data(to_i2c_client(dev), 333 TMP401_TEMP_HIGH_LIMIT_LSB[index], reg & 0xFF); 334 335 data->temp_high[index] = reg; 336 337 mutex_unlock(&data->update_lock); 338 339 return count; 340 } 341 342 static ssize_t store_temp_crit(struct device *dev, struct device_attribute 343 *devattr, const char *buf, size_t count) 344 { 345 int index = to_sensor_dev_attr(devattr)->index; 346 struct tmp401_data *data = tmp401_update_device(dev); 347 long val; 348 u8 reg; 349 350 if (strict_strtol(buf, 10, &val)) 351 return -EINVAL; 352 353 reg = tmp401_crit_temp_to_register(val, data->config); 354 355 mutex_lock(&data->update_lock); 356 357 i2c_smbus_write_byte_data(to_i2c_client(dev), 358 TMP401_TEMP_CRIT_LIMIT[index], reg); 359 360 data->temp_crit[index] = reg; 361 362 mutex_unlock(&data->update_lock); 363 364 return count; 365 } 366 367 static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute 368 *devattr, const char *buf, size_t count) 369 { 370 int temp, index = to_sensor_dev_attr(devattr)->index; 371 struct tmp401_data *data = tmp401_update_device(dev); 372 long val; 373 u8 reg; 374 375 if (strict_strtol(buf, 10, &val)) 376 return -EINVAL; 377 378 if (data->config & TMP401_CONFIG_RANGE) 379 val = SENSORS_LIMIT(val, -64000, 191000); 380 else 381 val = SENSORS_LIMIT(val, 0, 127000); 382 383 mutex_lock(&data->update_lock); 384 temp = tmp401_crit_register_to_temp(data->temp_crit[index], 385 data->config); 386 val = SENSORS_LIMIT(val, temp - 255000, temp); 387 reg = ((temp - val) + 500) / 1000; 388 389 i2c_smbus_write_byte_data(to_i2c_client(dev), 390 TMP401_TEMP_CRIT_HYST, reg); 391 392 data->temp_crit_hyst = reg; 393 394 mutex_unlock(&data->update_lock); 395 396 return count; 397 } 398 399 /* 400 * Resets the historical measurements of minimum and maximum temperatures. 401 * This is done by writing any value to any of the minimum/maximum registers 402 * (0x30-0x37). 403 */ 404 static ssize_t reset_temp_history(struct device *dev, 405 struct device_attribute *devattr, const char *buf, size_t count) 406 { 407 long val; 408 409 if (strict_strtol(buf, 10, &val)) 410 return -EINVAL; 411 412 if (val != 1) { 413 dev_err(dev, "temp_reset_history value %ld not" 414 " supported. Use 1 to reset the history!\n", val); 415 return -EINVAL; 416 } 417 i2c_smbus_write_byte_data(to_i2c_client(dev), 418 TMP411_TEMP_LOWEST_MSB[0], val); 419 420 return count; 421 } 422 423 static struct sensor_device_attribute tmp401_attr[] = { 424 SENSOR_ATTR(temp1_input, 0444, show_temp_value, NULL, 0), 425 SENSOR_ATTR(temp1_min, 0644, show_temp_min, store_temp_min, 0), 426 SENSOR_ATTR(temp1_max, 0644, show_temp_max, store_temp_max, 0), 427 SENSOR_ATTR(temp1_crit, 0644, show_temp_crit, store_temp_crit, 0), 428 SENSOR_ATTR(temp1_crit_hyst, 0644, show_temp_crit_hyst, 429 store_temp_crit_hyst, 0), 430 SENSOR_ATTR(temp1_min_alarm, 0444, show_status, NULL, 431 TMP401_STATUS_LOCAL_LOW), 432 SENSOR_ATTR(temp1_max_alarm, 0444, show_status, NULL, 433 TMP401_STATUS_LOCAL_HIGH), 434 SENSOR_ATTR(temp1_crit_alarm, 0444, show_status, NULL, 435 TMP401_STATUS_LOCAL_CRIT), 436 SENSOR_ATTR(temp2_input, 0444, show_temp_value, NULL, 1), 437 SENSOR_ATTR(temp2_min, 0644, show_temp_min, store_temp_min, 1), 438 SENSOR_ATTR(temp2_max, 0644, show_temp_max, store_temp_max, 1), 439 SENSOR_ATTR(temp2_crit, 0644, show_temp_crit, store_temp_crit, 1), 440 SENSOR_ATTR(temp2_crit_hyst, 0444, show_temp_crit_hyst, NULL, 1), 441 SENSOR_ATTR(temp2_fault, 0444, show_status, NULL, 442 TMP401_STATUS_REMOTE_OPEN), 443 SENSOR_ATTR(temp2_min_alarm, 0444, show_status, NULL, 444 TMP401_STATUS_REMOTE_LOW), 445 SENSOR_ATTR(temp2_max_alarm, 0444, show_status, NULL, 446 TMP401_STATUS_REMOTE_HIGH), 447 SENSOR_ATTR(temp2_crit_alarm, 0444, show_status, NULL, 448 TMP401_STATUS_REMOTE_CRIT), 449 }; 450 451 /* 452 * Additional features of the TMP411 chip. 453 * The TMP411 stores the minimum and maximum 454 * temperature measured since power-on, chip-reset, or 455 * minimum and maximum register reset for both the local 456 * and remote channels. 457 */ 458 static struct sensor_device_attribute tmp411_attr[] = { 459 SENSOR_ATTR(temp1_highest, 0444, show_temp_highest, NULL, 0), 460 SENSOR_ATTR(temp1_lowest, 0444, show_temp_lowest, NULL, 0), 461 SENSOR_ATTR(temp2_highest, 0444, show_temp_highest, NULL, 1), 462 SENSOR_ATTR(temp2_lowest, 0444, show_temp_lowest, NULL, 1), 463 SENSOR_ATTR(temp_reset_history, 0200, NULL, reset_temp_history, 0), 464 }; 465 466 /* 467 * Begin non sysfs callback code (aka Real code) 468 */ 469 470 static void tmp401_init_client(struct i2c_client *client) 471 { 472 int config, config_orig; 473 474 /* Set the conversion rate to 2 Hz */ 475 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5); 476 477 /* Start conversions (disable shutdown if necessary) */ 478 config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ); 479 if (config < 0) { 480 dev_warn(&client->dev, "Initialization failed!\n"); 481 return; 482 } 483 484 config_orig = config; 485 config &= ~TMP401_CONFIG_SHUTDOWN; 486 487 if (config != config_orig) 488 i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config); 489 } 490 491 static int tmp401_detect(struct i2c_client *client, int kind, 492 struct i2c_board_info *info) 493 { 494 struct i2c_adapter *adapter = client->adapter; 495 496 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 497 return -ENODEV; 498 499 /* Detect and identify the chip */ 500 if (kind <= 0) { 501 u8 reg; 502 503 reg = i2c_smbus_read_byte_data(client, 504 TMP401_MANUFACTURER_ID_REG); 505 if (reg != TMP401_MANUFACTURER_ID) 506 return -ENODEV; 507 508 reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG); 509 510 switch (reg) { 511 case TMP401_DEVICE_ID: 512 kind = tmp401; 513 break; 514 case TMP411_DEVICE_ID: 515 kind = tmp411; 516 break; 517 default: 518 return -ENODEV; 519 } 520 521 reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ); 522 if (reg & 0x1b) 523 return -ENODEV; 524 525 reg = i2c_smbus_read_byte_data(client, 526 TMP401_CONVERSION_RATE_READ); 527 /* Datasheet says: 0x1-0x6 */ 528 if (reg > 15) 529 return -ENODEV; 530 } 531 strlcpy(info->type, tmp401_id[kind - 1].name, I2C_NAME_SIZE); 532 533 return 0; 534 } 535 536 static int tmp401_probe(struct i2c_client *client, 537 const struct i2c_device_id *id) 538 { 539 int i, err = 0; 540 struct tmp401_data *data; 541 const char *names[] = { "TMP401", "TMP411" }; 542 543 data = kzalloc(sizeof(struct tmp401_data), GFP_KERNEL); 544 if (!data) 545 return -ENOMEM; 546 547 i2c_set_clientdata(client, data); 548 mutex_init(&data->update_lock); 549 data->kind = id->driver_data; 550 551 /* Initialize the TMP401 chip */ 552 tmp401_init_client(client); 553 554 /* Register sysfs hooks */ 555 for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++) { 556 err = device_create_file(&client->dev, 557 &tmp401_attr[i].dev_attr); 558 if (err) 559 goto exit_remove; 560 } 561 562 /* Register aditional tmp411 sysfs hooks */ 563 if (data->kind == tmp411) { 564 for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++) { 565 err = device_create_file(&client->dev, 566 &tmp411_attr[i].dev_attr); 567 if (err) 568 goto exit_remove; 569 } 570 } 571 572 data->hwmon_dev = hwmon_device_register(&client->dev); 573 if (IS_ERR(data->hwmon_dev)) { 574 err = PTR_ERR(data->hwmon_dev); 575 data->hwmon_dev = NULL; 576 goto exit_remove; 577 } 578 579 dev_info(&client->dev, "Detected TI %s chip\n", 580 names[data->kind - 1]); 581 582 return 0; 583 584 exit_remove: 585 tmp401_remove(client); /* will also free data for us */ 586 return err; 587 } 588 589 static int tmp401_remove(struct i2c_client *client) 590 { 591 struct tmp401_data *data = i2c_get_clientdata(client); 592 int i; 593 594 if (data->hwmon_dev) 595 hwmon_device_unregister(data->hwmon_dev); 596 597 for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++) 598 device_remove_file(&client->dev, &tmp401_attr[i].dev_attr); 599 600 if (data->kind == tmp411) { 601 for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++) 602 device_remove_file(&client->dev, 603 &tmp411_attr[i].dev_attr); 604 } 605 606 kfree(data); 607 return 0; 608 } 609 610 static struct tmp401_data *tmp401_update_device_reg16( 611 struct i2c_client *client, struct tmp401_data *data) 612 { 613 int i; 614 615 for (i = 0; i < 2; i++) { 616 /* 617 * High byte must be read first immediately followed 618 * by the low byte 619 */ 620 data->temp[i] = i2c_smbus_read_byte_data(client, 621 TMP401_TEMP_MSB[i]) << 8; 622 data->temp[i] |= i2c_smbus_read_byte_data(client, 623 TMP401_TEMP_LSB[i]); 624 data->temp_low[i] = i2c_smbus_read_byte_data(client, 625 TMP401_TEMP_LOW_LIMIT_MSB_READ[i]) << 8; 626 data->temp_low[i] |= i2c_smbus_read_byte_data(client, 627 TMP401_TEMP_LOW_LIMIT_LSB[i]); 628 data->temp_high[i] = i2c_smbus_read_byte_data(client, 629 TMP401_TEMP_HIGH_LIMIT_MSB_READ[i]) << 8; 630 data->temp_high[i] |= i2c_smbus_read_byte_data(client, 631 TMP401_TEMP_HIGH_LIMIT_LSB[i]); 632 data->temp_crit[i] = i2c_smbus_read_byte_data(client, 633 TMP401_TEMP_CRIT_LIMIT[i]); 634 635 if (data->kind == tmp411) { 636 data->temp_lowest[i] = i2c_smbus_read_byte_data(client, 637 TMP411_TEMP_LOWEST_MSB[i]) << 8; 638 data->temp_lowest[i] |= i2c_smbus_read_byte_data( 639 client, TMP411_TEMP_LOWEST_LSB[i]); 640 641 data->temp_highest[i] = i2c_smbus_read_byte_data( 642 client, TMP411_TEMP_HIGHEST_MSB[i]) << 8; 643 data->temp_highest[i] |= i2c_smbus_read_byte_data( 644 client, TMP411_TEMP_HIGHEST_LSB[i]); 645 } 646 } 647 return data; 648 } 649 650 static struct tmp401_data *tmp401_update_device(struct device *dev) 651 { 652 struct i2c_client *client = to_i2c_client(dev); 653 struct tmp401_data *data = i2c_get_clientdata(client); 654 655 mutex_lock(&data->update_lock); 656 657 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 658 data->status = i2c_smbus_read_byte_data(client, TMP401_STATUS); 659 data->config = i2c_smbus_read_byte_data(client, 660 TMP401_CONFIG_READ); 661 tmp401_update_device_reg16(client, data); 662 663 data->temp_crit_hyst = i2c_smbus_read_byte_data(client, 664 TMP401_TEMP_CRIT_HYST); 665 666 data->last_updated = jiffies; 667 data->valid = 1; 668 } 669 670 mutex_unlock(&data->update_lock); 671 672 return data; 673 } 674 675 static int __init tmp401_init(void) 676 { 677 return i2c_add_driver(&tmp401_driver); 678 } 679 680 static void __exit tmp401_exit(void) 681 { 682 i2c_del_driver(&tmp401_driver); 683 } 684 685 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); 686 MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver"); 687 MODULE_LICENSE("GPL"); 688 689 module_init(tmp401_init); 690 module_exit(tmp401_exit); 691