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 enum 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 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 }; 72 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 }; 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 * Functions declarations 96 */ 97 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); 104 105 /* 106 * Driver data (common to all clients) 107 */ 108 109 static const struct i2c_device_id tmp401_id[] = { 110 { "tmp401", tmp401 }, 111 { "tmp411", tmp411 }, 112 { } 113 }; 114 MODULE_DEVICE_TABLE(i2c, tmp401_id); 115 116 static struct i2c_driver tmp401_driver = { 117 .class = I2C_CLASS_HWMON, 118 .driver = { 119 .name = "tmp401", 120 }, 121 .probe = tmp401_probe, 122 .remove = tmp401_remove, 123 .id_table = tmp401_id, 124 .detect = tmp401_detect, 125 .address_list = normal_i2c, 126 }; 127 128 /* 129 * Client data (each client gets its own) 130 */ 131 132 struct tmp401_data { 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 */ 137 int kind; 138 139 /* register values */ 140 u8 status; 141 u8 config; 142 u16 temp[2]; 143 u16 temp_low[2]; 144 u16 temp_high[2]; 145 u8 temp_crit[2]; 146 u8 temp_crit_hyst; 147 u16 temp_lowest[2]; 148 u16 temp_highest[2]; 149 }; 150 151 /* 152 * Sysfs attr show / store functions 153 */ 154 155 static int tmp401_register_to_temp(u16 reg, u8 config) 156 { 157 int temp = reg; 158 159 if (config & TMP401_CONFIG_RANGE) 160 temp -= 64 * 256; 161 162 return (temp * 625 + 80) / 160; 163 } 164 165 static u16 tmp401_temp_to_register(long temp, u8 config) 166 { 167 if (config & TMP401_CONFIG_RANGE) { 168 temp = SENSORS_LIMIT(temp, -64000, 191000); 169 temp += 64000; 170 } else 171 temp = SENSORS_LIMIT(temp, 0, 127000); 172 173 return (temp * 160 + 312) / 625; 174 } 175 176 static int tmp401_crit_register_to_temp(u8 reg, u8 config) 177 { 178 int temp = reg; 179 180 if (config & TMP401_CONFIG_RANGE) 181 temp -= 64; 182 183 return temp * 1000; 184 } 185 186 static u8 tmp401_crit_temp_to_register(long temp, u8 config) 187 { 188 if (config & TMP401_CONFIG_RANGE) { 189 temp = SENSORS_LIMIT(temp, -64000, 191000); 190 temp += 64000; 191 } else 192 temp = SENSORS_LIMIT(temp, 0, 127000); 193 194 return (temp + 500) / 1000; 195 } 196 197 static ssize_t show_temp_value(struct device *dev, 198 struct device_attribute *devattr, char *buf) 199 { 200 int index = to_sensor_dev_attr(devattr)->index; 201 struct tmp401_data *data = tmp401_update_device(dev); 202 203 return sprintf(buf, "%d\n", 204 tmp401_register_to_temp(data->temp[index], data->config)); 205 } 206 207 static ssize_t show_temp_min(struct device *dev, 208 struct device_attribute *devattr, char *buf) 209 { 210 int index = to_sensor_dev_attr(devattr)->index; 211 struct tmp401_data *data = tmp401_update_device(dev); 212 213 return sprintf(buf, "%d\n", 214 tmp401_register_to_temp(data->temp_low[index], data->config)); 215 } 216 217 static ssize_t show_temp_max(struct device *dev, 218 struct device_attribute *devattr, char *buf) 219 { 220 int index = to_sensor_dev_attr(devattr)->index; 221 struct tmp401_data *data = tmp401_update_device(dev); 222 223 return sprintf(buf, "%d\n", 224 tmp401_register_to_temp(data->temp_high[index], data->config)); 225 } 226 227 static ssize_t show_temp_crit(struct device *dev, 228 struct device_attribute *devattr, char *buf) 229 { 230 int index = to_sensor_dev_attr(devattr)->index; 231 struct tmp401_data *data = tmp401_update_device(dev); 232 233 return sprintf(buf, "%d\n", 234 tmp401_crit_register_to_temp(data->temp_crit[index], 235 data->config)); 236 } 237 238 static ssize_t show_temp_crit_hyst(struct device *dev, 239 struct device_attribute *devattr, char *buf) 240 { 241 int temp, index = to_sensor_dev_attr(devattr)->index; 242 struct tmp401_data *data = tmp401_update_device(dev); 243 244 mutex_lock(&data->update_lock); 245 temp = tmp401_crit_register_to_temp(data->temp_crit[index], 246 data->config); 247 temp -= data->temp_crit_hyst * 1000; 248 mutex_unlock(&data->update_lock); 249 250 return sprintf(buf, "%d\n", temp); 251 } 252 253 static ssize_t show_temp_lowest(struct device *dev, 254 struct device_attribute *devattr, char *buf) 255 { 256 int index = to_sensor_dev_attr(devattr)->index; 257 struct tmp401_data *data = tmp401_update_device(dev); 258 259 return sprintf(buf, "%d\n", 260 tmp401_register_to_temp(data->temp_lowest[index], 261 data->config)); 262 } 263 264 static ssize_t show_temp_highest(struct device *dev, 265 struct device_attribute *devattr, char *buf) 266 { 267 int index = to_sensor_dev_attr(devattr)->index; 268 struct tmp401_data *data = tmp401_update_device(dev); 269 270 return sprintf(buf, "%d\n", 271 tmp401_register_to_temp(data->temp_highest[index], 272 data->config)); 273 } 274 275 static ssize_t show_status(struct device *dev, 276 struct device_attribute *devattr, char *buf) 277 { 278 int mask = to_sensor_dev_attr(devattr)->index; 279 struct tmp401_data *data = tmp401_update_device(dev); 280 281 if (data->status & mask) 282 return sprintf(buf, "1\n"); 283 else 284 return sprintf(buf, "0\n"); 285 } 286 287 static ssize_t store_temp_min(struct device *dev, struct device_attribute 288 *devattr, const char *buf, size_t count) 289 { 290 int index = to_sensor_dev_attr(devattr)->index; 291 struct tmp401_data *data = tmp401_update_device(dev); 292 long val; 293 u16 reg; 294 295 if (strict_strtol(buf, 10, &val)) 296 return -EINVAL; 297 298 reg = tmp401_temp_to_register(val, data->config); 299 300 mutex_lock(&data->update_lock); 301 302 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); 306 307 data->temp_low[index] = reg; 308 309 mutex_unlock(&data->update_lock); 310 311 return count; 312 } 313 314 static ssize_t store_temp_max(struct device *dev, struct device_attribute 315 *devattr, const char *buf, size_t count) 316 { 317 int index = to_sensor_dev_attr(devattr)->index; 318 struct tmp401_data *data = tmp401_update_device(dev); 319 long val; 320 u16 reg; 321 322 if (strict_strtol(buf, 10, &val)) 323 return -EINVAL; 324 325 reg = tmp401_temp_to_register(val, data->config); 326 327 mutex_lock(&data->update_lock); 328 329 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); 333 334 data->temp_high[index] = reg; 335 336 mutex_unlock(&data->update_lock); 337 338 return count; 339 } 340 341 static ssize_t store_temp_crit(struct device *dev, struct device_attribute 342 *devattr, const char *buf, size_t count) 343 { 344 int index = to_sensor_dev_attr(devattr)->index; 345 struct tmp401_data *data = tmp401_update_device(dev); 346 long val; 347 u8 reg; 348 349 if (strict_strtol(buf, 10, &val)) 350 return -EINVAL; 351 352 reg = tmp401_crit_temp_to_register(val, data->config); 353 354 mutex_lock(&data->update_lock); 355 356 i2c_smbus_write_byte_data(to_i2c_client(dev), 357 TMP401_TEMP_CRIT_LIMIT[index], reg); 358 359 data->temp_crit[index] = reg; 360 361 mutex_unlock(&data->update_lock); 362 363 return count; 364 } 365 366 static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute 367 *devattr, const char *buf, size_t count) 368 { 369 int temp, index = to_sensor_dev_attr(devattr)->index; 370 struct tmp401_data *data = tmp401_update_device(dev); 371 long val; 372 u8 reg; 373 374 if (strict_strtol(buf, 10, &val)) 375 return -EINVAL; 376 377 if (data->config & TMP401_CONFIG_RANGE) 378 val = SENSORS_LIMIT(val, -64000, 191000); 379 else 380 val = SENSORS_LIMIT(val, 0, 127000); 381 382 mutex_lock(&data->update_lock); 383 temp = tmp401_crit_register_to_temp(data->temp_crit[index], 384 data->config); 385 val = SENSORS_LIMIT(val, temp - 255000, temp); 386 reg = ((temp - val) + 500) / 1000; 387 388 i2c_smbus_write_byte_data(to_i2c_client(dev), 389 TMP401_TEMP_CRIT_HYST, reg); 390 391 data->temp_crit_hyst = reg; 392 393 mutex_unlock(&data->update_lock); 394 395 return count; 396 } 397 398 /* 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 401 * (0x30-0x37). 402 */ 403 static ssize_t reset_temp_history(struct device *dev, 404 struct device_attribute *devattr, const char *buf, size_t count) 405 { 406 long val; 407 408 if (strict_strtol(buf, 10, &val)) 409 return -EINVAL; 410 411 if (val != 1) { 412 dev_err(dev, "temp_reset_history value %ld not" 413 " supported. Use 1 to reset the history!\n", val); 414 return -EINVAL; 415 } 416 i2c_smbus_write_byte_data(to_i2c_client(dev), 417 TMP411_TEMP_LOWEST_MSB[0], val); 418 419 return count; 420 } 421 422 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), 448 }; 449 450 /* 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. 456 */ 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), 463 }; 464 465 /* 466 * Begin non sysfs callback code (aka Real code) 467 */ 468 469 static void tmp401_init_client(struct i2c_client *client) 470 { 471 int config, config_orig; 472 473 /* Set the conversion rate to 2 Hz */ 474 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5); 475 476 /* Start conversions (disable shutdown if necessary) */ 477 config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ); 478 if (config < 0) { 479 dev_warn(&client->dev, "Initialization failed!\n"); 480 return; 481 } 482 483 config_orig = config; 484 config &= ~TMP401_CONFIG_SHUTDOWN; 485 486 if (config != config_orig) 487 i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config); 488 } 489 490 static int tmp401_detect(struct i2c_client *client, 491 struct i2c_board_info *info) 492 { 493 enum chips kind; 494 struct i2c_adapter *adapter = client->adapter; 495 u8 reg; 496 497 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 498 return -ENODEV; 499 500 /* Detect and identify the chip */ 501 reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG); 502 if (reg != TMP401_MANUFACTURER_ID) 503 return -ENODEV; 504 505 reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG); 506 507 switch (reg) { 508 case TMP401_DEVICE_ID: 509 kind = tmp401; 510 break; 511 case TMP411_DEVICE_ID: 512 kind = tmp411; 513 break; 514 default: 515 return -ENODEV; 516 } 517 518 reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ); 519 if (reg & 0x1b) 520 return -ENODEV; 521 522 reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ); 523 /* Datasheet says: 0x1-0x6 */ 524 if (reg > 15) 525 return -ENODEV; 526 527 strlcpy(info->type, tmp401_id[kind - 1].name, I2C_NAME_SIZE); 528 529 return 0; 530 } 531 532 static int tmp401_probe(struct i2c_client *client, 533 const struct i2c_device_id *id) 534 { 535 int i, err = 0; 536 struct tmp401_data *data; 537 const char *names[] = { "TMP401", "TMP411" }; 538 539 data = kzalloc(sizeof(struct tmp401_data), GFP_KERNEL); 540 if (!data) 541 return -ENOMEM; 542 543 i2c_set_clientdata(client, data); 544 mutex_init(&data->update_lock); 545 data->kind = id->driver_data; 546 547 /* Initialize the TMP401 chip */ 548 tmp401_init_client(client); 549 550 /* 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); 554 if (err) 555 goto exit_remove; 556 } 557 558 /* 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); 563 if (err) 564 goto exit_remove; 565 } 566 } 567 568 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; 572 goto exit_remove; 573 } 574 575 dev_info(&client->dev, "Detected TI %s chip\n", 576 names[data->kind - 1]); 577 578 return 0; 579 580 exit_remove: 581 tmp401_remove(client); /* will also free data for us */ 582 return err; 583 } 584 585 static int tmp401_remove(struct i2c_client *client) 586 { 587 struct tmp401_data *data = i2c_get_clientdata(client); 588 int i; 589 590 if (data->hwmon_dev) 591 hwmon_device_unregister(data->hwmon_dev); 592 593 for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++) 594 device_remove_file(&client->dev, &tmp401_attr[i].dev_attr); 595 596 if (data->kind == tmp411) { 597 for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++) 598 device_remove_file(&client->dev, 599 &tmp411_attr[i].dev_attr); 600 } 601 602 kfree(data); 603 return 0; 604 } 605 606 static struct tmp401_data *tmp401_update_device_reg16( 607 struct i2c_client *client, struct tmp401_data *data) 608 { 609 int i; 610 611 for (i = 0; i < 2; i++) { 612 /* 613 * High byte must be read first immediately followed 614 * by the low byte 615 */ 616 data->temp[i] = i2c_smbus_read_byte_data(client, 617 TMP401_TEMP_MSB[i]) << 8; 618 data->temp[i] |= i2c_smbus_read_byte_data(client, 619 TMP401_TEMP_LSB[i]); 620 data->temp_low[i] = i2c_smbus_read_byte_data(client, 621 TMP401_TEMP_LOW_LIMIT_MSB_READ[i]) << 8; 622 data->temp_low[i] |= i2c_smbus_read_byte_data(client, 623 TMP401_TEMP_LOW_LIMIT_LSB[i]); 624 data->temp_high[i] = i2c_smbus_read_byte_data(client, 625 TMP401_TEMP_HIGH_LIMIT_MSB_READ[i]) << 8; 626 data->temp_high[i] |= i2c_smbus_read_byte_data(client, 627 TMP401_TEMP_HIGH_LIMIT_LSB[i]); 628 data->temp_crit[i] = i2c_smbus_read_byte_data(client, 629 TMP401_TEMP_CRIT_LIMIT[i]); 630 631 if (data->kind == tmp411) { 632 data->temp_lowest[i] = i2c_smbus_read_byte_data(client, 633 TMP411_TEMP_LOWEST_MSB[i]) << 8; 634 data->temp_lowest[i] |= i2c_smbus_read_byte_data( 635 client, TMP411_TEMP_LOWEST_LSB[i]); 636 637 data->temp_highest[i] = i2c_smbus_read_byte_data( 638 client, TMP411_TEMP_HIGHEST_MSB[i]) << 8; 639 data->temp_highest[i] |= i2c_smbus_read_byte_data( 640 client, TMP411_TEMP_HIGHEST_LSB[i]); 641 } 642 } 643 return data; 644 } 645 646 static struct tmp401_data *tmp401_update_device(struct device *dev) 647 { 648 struct i2c_client *client = to_i2c_client(dev); 649 struct tmp401_data *data = i2c_get_clientdata(client); 650 651 mutex_lock(&data->update_lock); 652 653 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 654 data->status = i2c_smbus_read_byte_data(client, TMP401_STATUS); 655 data->config = i2c_smbus_read_byte_data(client, 656 TMP401_CONFIG_READ); 657 tmp401_update_device_reg16(client, data); 658 659 data->temp_crit_hyst = i2c_smbus_read_byte_data(client, 660 TMP401_TEMP_CRIT_HYST); 661 662 data->last_updated = jiffies; 663 data->valid = 1; 664 } 665 666 mutex_unlock(&data->update_lock); 667 668 return data; 669 } 670 671 static int __init tmp401_init(void) 672 { 673 return i2c_add_driver(&tmp401_driver); 674 } 675 676 static void __exit tmp401_exit(void) 677 { 678 i2c_del_driver(&tmp401_driver); 679 } 680 681 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); 682 MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver"); 683 MODULE_LICENSE("GPL"); 684 685 module_init(tmp401_init); 686 module_exit(tmp401_exit); 687