/drivers/hwmon/jc42.c
C | 644 lines | 492 code | 100 blank | 52 comment | 51 complexity | 83ae7b3f3774d7d84c88cafc7ccf03f9 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
1/* 2 * jc42.c - driver for Jedec JC42.4 compliant temperature sensors 3 * 4 * Copyright (c) 2010 Ericsson AB. 5 * 6 * Derived from lm77.c by Andras BALI <drewie@freemail.hu>. 7 * 8 * JC42.4 compliant temperature sensors are typically used on memory modules. 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 23 */ 24 25#include <linux/module.h> 26#include <linux/init.h> 27#include <linux/slab.h> 28#include <linux/jiffies.h> 29#include <linux/i2c.h> 30#include <linux/hwmon.h> 31#include <linux/hwmon-sysfs.h> 32#include <linux/err.h> 33#include <linux/mutex.h> 34 35/* Addresses to scan */ 36static const unsigned short normal_i2c[] = { 37 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, I2C_CLIENT_END }; 38 39/* JC42 registers. All registers are 16 bit. */ 40#define JC42_REG_CAP 0x00 41#define JC42_REG_CONFIG 0x01 42#define JC42_REG_TEMP_UPPER 0x02 43#define JC42_REG_TEMP_LOWER 0x03 44#define JC42_REG_TEMP_CRITICAL 0x04 45#define JC42_REG_TEMP 0x05 46#define JC42_REG_MANID 0x06 47#define JC42_REG_DEVICEID 0x07 48 49/* Status bits in temperature register */ 50#define JC42_ALARM_CRIT_BIT 15 51#define JC42_ALARM_MAX_BIT 14 52#define JC42_ALARM_MIN_BIT 13 53 54/* Configuration register defines */ 55#define JC42_CFG_CRIT_ONLY (1 << 2) 56#define JC42_CFG_TCRIT_LOCK (1 << 6) 57#define JC42_CFG_EVENT_LOCK (1 << 7) 58#define JC42_CFG_SHUTDOWN (1 << 8) 59#define JC42_CFG_HYST_SHIFT 9 60#define JC42_CFG_HYST_MASK 0x03 61 62/* Capabilities */ 63#define JC42_CAP_RANGE (1 << 2) 64 65/* Manufacturer IDs */ 66#define ADT_MANID 0x11d4 /* Analog Devices */ 67#define ATMEL_MANID 0x001f /* Atmel */ 68#define MAX_MANID 0x004d /* Maxim */ 69#define IDT_MANID 0x00b3 /* IDT */ 70#define MCP_MANID 0x0054 /* Microchip */ 71#define NXP_MANID 0x1131 /* NXP Semiconductors */ 72#define ONS_MANID 0x1b09 /* ON Semiconductor */ 73#define STM_MANID 0x104a /* ST Microelectronics */ 74 75/* Supported chips */ 76 77/* Analog Devices */ 78#define ADT7408_DEVID 0x0801 79#define ADT7408_DEVID_MASK 0xffff 80 81/* Atmel */ 82#define AT30TS00_DEVID 0x8201 83#define AT30TS00_DEVID_MASK 0xffff 84 85/* IDT */ 86#define TS3000B3_DEVID 0x2903 /* Also matches TSE2002B3 */ 87#define TS3000B3_DEVID_MASK 0xffff 88 89#define TS3000GB2_DEVID 0x2912 /* Also matches TSE2002GB2 */ 90#define TS3000GB2_DEVID_MASK 0xffff 91 92/* Maxim */ 93#define MAX6604_DEVID 0x3e00 94#define MAX6604_DEVID_MASK 0xffff 95 96/* Microchip */ 97#define MCP9804_DEVID 0x0200 98#define MCP9804_DEVID_MASK 0xfffc 99 100#define MCP98242_DEVID 0x2000 101#define MCP98242_DEVID_MASK 0xfffc 102 103#define MCP98243_DEVID 0x2100 104#define MCP98243_DEVID_MASK 0xfffc 105 106#define MCP9843_DEVID 0x0000 /* Also matches mcp9805 */ 107#define MCP9843_DEVID_MASK 0xfffe 108 109/* NXP */ 110#define SE97_DEVID 0xa200 111#define SE97_DEVID_MASK 0xfffc 112 113#define SE98_DEVID 0xa100 114#define SE98_DEVID_MASK 0xfffc 115 116/* ON Semiconductor */ 117#define CAT6095_DEVID 0x0800 /* Also matches CAT34TS02 */ 118#define CAT6095_DEVID_MASK 0xffe0 119 120/* ST Microelectronics */ 121#define STTS424_DEVID 0x0101 122#define STTS424_DEVID_MASK 0xffff 123 124#define STTS424E_DEVID 0x0000 125#define STTS424E_DEVID_MASK 0xfffe 126 127#define STTS2002_DEVID 0x0300 128#define STTS2002_DEVID_MASK 0xffff 129 130#define STTS3000_DEVID 0x0200 131#define STTS3000_DEVID_MASK 0xffff 132 133static u16 jc42_hysteresis[] = { 0, 1500, 3000, 6000 }; 134 135struct jc42_chips { 136 u16 manid; 137 u16 devid; 138 u16 devid_mask; 139}; 140 141static struct jc42_chips jc42_chips[] = { 142 { ADT_MANID, ADT7408_DEVID, ADT7408_DEVID_MASK }, 143 { ATMEL_MANID, AT30TS00_DEVID, AT30TS00_DEVID_MASK }, 144 { IDT_MANID, TS3000B3_DEVID, TS3000B3_DEVID_MASK }, 145 { IDT_MANID, TS3000GB2_DEVID, TS3000GB2_DEVID_MASK }, 146 { MAX_MANID, MAX6604_DEVID, MAX6604_DEVID_MASK }, 147 { MCP_MANID, MCP9804_DEVID, MCP9804_DEVID_MASK }, 148 { MCP_MANID, MCP98242_DEVID, MCP98242_DEVID_MASK }, 149 { MCP_MANID, MCP98243_DEVID, MCP98243_DEVID_MASK }, 150 { MCP_MANID, MCP9843_DEVID, MCP9843_DEVID_MASK }, 151 { NXP_MANID, SE97_DEVID, SE97_DEVID_MASK }, 152 { ONS_MANID, CAT6095_DEVID, CAT6095_DEVID_MASK }, 153 { NXP_MANID, SE98_DEVID, SE98_DEVID_MASK }, 154 { STM_MANID, STTS424_DEVID, STTS424_DEVID_MASK }, 155 { STM_MANID, STTS424E_DEVID, STTS424E_DEVID_MASK }, 156 { STM_MANID, STTS2002_DEVID, STTS2002_DEVID_MASK }, 157 { STM_MANID, STTS3000_DEVID, STTS3000_DEVID_MASK }, 158}; 159 160/* Each client has this additional data */ 161struct jc42_data { 162 struct device *hwmon_dev; 163 struct mutex update_lock; /* protect register access */ 164 bool extended; /* true if extended range supported */ 165 bool valid; 166 unsigned long last_updated; /* In jiffies */ 167 u16 orig_config; /* original configuration */ 168 u16 config; /* current configuration */ 169 u16 temp_input; /* Temperatures */ 170 u16 temp_crit; 171 u16 temp_min; 172 u16 temp_max; 173}; 174 175static int jc42_probe(struct i2c_client *client, 176 const struct i2c_device_id *id); 177static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info); 178static int jc42_remove(struct i2c_client *client); 179static int jc42_read_value(struct i2c_client *client, u8 reg); 180static int jc42_write_value(struct i2c_client *client, u8 reg, u16 value); 181 182static struct jc42_data *jc42_update_device(struct device *dev); 183 184static const struct i2c_device_id jc42_id[] = { 185 { "adt7408", 0 }, 186 { "at30ts00", 0 }, 187 { "cat94ts02", 0 }, 188 { "cat6095", 0 }, 189 { "jc42", 0 }, 190 { "max6604", 0 }, 191 { "mcp9804", 0 }, 192 { "mcp9805", 0 }, 193 { "mcp98242", 0 }, 194 { "mcp98243", 0 }, 195 { "mcp9843", 0 }, 196 { "se97", 0 }, 197 { "se97b", 0 }, 198 { "se98", 0 }, 199 { "stts424", 0 }, 200 { "stts2002", 0 }, 201 { "stts3000", 0 }, 202 { "tse2002", 0 }, 203 { "ts3000", 0 }, 204 { } 205}; 206MODULE_DEVICE_TABLE(i2c, jc42_id); 207 208#ifdef CONFIG_PM 209 210static int jc42_suspend(struct device *dev) 211{ 212 struct i2c_client *client = to_i2c_client(dev); 213 struct jc42_data *data = i2c_get_clientdata(client); 214 215 data->config |= JC42_CFG_SHUTDOWN; 216 jc42_write_value(client, JC42_REG_CONFIG, data->config); 217 return 0; 218} 219 220static int jc42_resume(struct device *dev) 221{ 222 struct i2c_client *client = to_i2c_client(dev); 223 struct jc42_data *data = i2c_get_clientdata(client); 224 225 data->config &= ~JC42_CFG_SHUTDOWN; 226 jc42_write_value(client, JC42_REG_CONFIG, data->config); 227 return 0; 228} 229 230static const struct dev_pm_ops jc42_dev_pm_ops = { 231 .suspend = jc42_suspend, 232 .resume = jc42_resume, 233}; 234 235#define JC42_DEV_PM_OPS (&jc42_dev_pm_ops) 236#else 237#define JC42_DEV_PM_OPS NULL 238#endif /* CONFIG_PM */ 239 240/* This is the driver that will be inserted */ 241static struct i2c_driver jc42_driver = { 242 .class = I2C_CLASS_SPD, 243 .driver = { 244 .name = "jc42", 245 .pm = JC42_DEV_PM_OPS, 246 }, 247 .probe = jc42_probe, 248 .remove = jc42_remove, 249 .id_table = jc42_id, 250 .detect = jc42_detect, 251 .address_list = normal_i2c, 252}; 253 254#define JC42_TEMP_MIN_EXTENDED (-40000) 255#define JC42_TEMP_MIN 0 256#define JC42_TEMP_MAX 125000 257 258static u16 jc42_temp_to_reg(int temp, bool extended) 259{ 260 int ntemp = SENSORS_LIMIT(temp, 261 extended ? JC42_TEMP_MIN_EXTENDED : 262 JC42_TEMP_MIN, JC42_TEMP_MAX); 263 264 /* convert from 0.001 to 0.0625 resolution */ 265 return (ntemp * 2 / 125) & 0x1fff; 266} 267 268static int jc42_temp_from_reg(s16 reg) 269{ 270 reg &= 0x1fff; 271 272 /* sign extend register */ 273 if (reg & 0x1000) 274 reg |= 0xf000; 275 276 /* convert from 0.0625 to 0.001 resolution */ 277 return reg * 125 / 2; 278} 279 280/* sysfs stuff */ 281 282/* read routines for temperature limits */ 283#define show(value) \ 284static ssize_t show_##value(struct device *dev, \ 285 struct device_attribute *attr, \ 286 char *buf) \ 287{ \ 288 struct jc42_data *data = jc42_update_device(dev); \ 289 if (IS_ERR(data)) \ 290 return PTR_ERR(data); \ 291 return sprintf(buf, "%d\n", jc42_temp_from_reg(data->value)); \ 292} 293 294show(temp_input); 295show(temp_crit); 296show(temp_min); 297show(temp_max); 298 299/* read routines for hysteresis values */ 300static ssize_t show_temp_crit_hyst(struct device *dev, 301 struct device_attribute *attr, char *buf) 302{ 303 struct jc42_data *data = jc42_update_device(dev); 304 int temp, hyst; 305 306 if (IS_ERR(data)) 307 return PTR_ERR(data); 308 309 temp = jc42_temp_from_reg(data->temp_crit); 310 hyst = jc42_hysteresis[(data->config >> JC42_CFG_HYST_SHIFT) 311 & JC42_CFG_HYST_MASK]; 312 return sprintf(buf, "%d\n", temp - hyst); 313} 314 315static ssize_t show_temp_max_hyst(struct device *dev, 316 struct device_attribute *attr, char *buf) 317{ 318 struct jc42_data *data = jc42_update_device(dev); 319 int temp, hyst; 320 321 if (IS_ERR(data)) 322 return PTR_ERR(data); 323 324 temp = jc42_temp_from_reg(data->temp_max); 325 hyst = jc42_hysteresis[(data->config >> JC42_CFG_HYST_SHIFT) 326 & JC42_CFG_HYST_MASK]; 327 return sprintf(buf, "%d\n", temp - hyst); 328} 329 330/* write routines */ 331#define set(value, reg) \ 332static ssize_t set_##value(struct device *dev, \ 333 struct device_attribute *attr, \ 334 const char *buf, size_t count) \ 335{ \ 336 struct i2c_client *client = to_i2c_client(dev); \ 337 struct jc42_data *data = i2c_get_clientdata(client); \ 338 int err, ret = count; \ 339 long val; \ 340 if (strict_strtol(buf, 10, &val) < 0) \ 341 return -EINVAL; \ 342 mutex_lock(&data->update_lock); \ 343 data->value = jc42_temp_to_reg(val, data->extended); \ 344 err = jc42_write_value(client, reg, data->value); \ 345 if (err < 0) \ 346 ret = err; \ 347 mutex_unlock(&data->update_lock); \ 348 return ret; \ 349} 350 351set(temp_min, JC42_REG_TEMP_LOWER); 352set(temp_max, JC42_REG_TEMP_UPPER); 353set(temp_crit, JC42_REG_TEMP_CRITICAL); 354 355/* JC42.4 compliant chips only support four hysteresis values. 356 * Pick best choice and go from there. */ 357static ssize_t set_temp_crit_hyst(struct device *dev, 358 struct device_attribute *attr, 359 const char *buf, size_t count) 360{ 361 struct i2c_client *client = to_i2c_client(dev); 362 struct jc42_data *data = i2c_get_clientdata(client); 363 unsigned long val; 364 int diff, hyst; 365 int err; 366 int ret = count; 367 368 if (strict_strtoul(buf, 10, &val) < 0) 369 return -EINVAL; 370 371 diff = jc42_temp_from_reg(data->temp_crit) - val; 372 hyst = 0; 373 if (diff > 0) { 374 if (diff < 2250) 375 hyst = 1; /* 1.5 degrees C */ 376 else if (diff < 4500) 377 hyst = 2; /* 3.0 degrees C */ 378 else 379 hyst = 3; /* 6.0 degrees C */ 380 } 381 382 mutex_lock(&data->update_lock); 383 data->config = (data->config 384 & ~(JC42_CFG_HYST_MASK << JC42_CFG_HYST_SHIFT)) 385 | (hyst << JC42_CFG_HYST_SHIFT); 386 err = jc42_write_value(client, JC42_REG_CONFIG, data->config); 387 if (err < 0) 388 ret = err; 389 mutex_unlock(&data->update_lock); 390 return ret; 391} 392 393static ssize_t show_alarm(struct device *dev, 394 struct device_attribute *attr, char *buf) 395{ 396 u16 bit = to_sensor_dev_attr(attr)->index; 397 struct jc42_data *data = jc42_update_device(dev); 398 u16 val; 399 400 if (IS_ERR(data)) 401 return PTR_ERR(data); 402 403 val = data->temp_input; 404 if (bit != JC42_ALARM_CRIT_BIT && (data->config & JC42_CFG_CRIT_ONLY)) 405 val = 0; 406 return sprintf(buf, "%u\n", (val >> bit) & 1); 407} 408 409static DEVICE_ATTR(temp1_input, S_IRUGO, 410 show_temp_input, NULL); 411static DEVICE_ATTR(temp1_crit, S_IRUGO, 412 show_temp_crit, set_temp_crit); 413static DEVICE_ATTR(temp1_min, S_IRUGO, 414 show_temp_min, set_temp_min); 415static DEVICE_ATTR(temp1_max, S_IRUGO, 416 show_temp_max, set_temp_max); 417 418static DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, 419 show_temp_crit_hyst, set_temp_crit_hyst); 420static DEVICE_ATTR(temp1_max_hyst, S_IRUGO, 421 show_temp_max_hyst, NULL); 422 423static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 424 JC42_ALARM_CRIT_BIT); 425static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 426 JC42_ALARM_MIN_BIT); 427static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 428 JC42_ALARM_MAX_BIT); 429 430static struct attribute *jc42_attributes[] = { 431 &dev_attr_temp1_input.attr, 432 &dev_attr_temp1_crit.attr, 433 &dev_attr_temp1_min.attr, 434 &dev_attr_temp1_max.attr, 435 &dev_attr_temp1_crit_hyst.attr, 436 &dev_attr_temp1_max_hyst.attr, 437 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, 438 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, 439 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, 440 NULL 441}; 442 443static mode_t jc42_attribute_mode(struct kobject *kobj, 444 struct attribute *attr, int index) 445{ 446 struct device *dev = container_of(kobj, struct device, kobj); 447 struct i2c_client *client = to_i2c_client(dev); 448 struct jc42_data *data = i2c_get_clientdata(client); 449 unsigned int config = data->config; 450 bool readonly; 451 452 if (attr == &dev_attr_temp1_crit.attr) 453 readonly = config & JC42_CFG_TCRIT_LOCK; 454 else if (attr == &dev_attr_temp1_min.attr || 455 attr == &dev_attr_temp1_max.attr) 456 readonly = config & JC42_CFG_EVENT_LOCK; 457 else if (attr == &dev_attr_temp1_crit_hyst.attr) 458 readonly = config & (JC42_CFG_EVENT_LOCK | JC42_CFG_TCRIT_LOCK); 459 else 460 readonly = true; 461 462 return S_IRUGO | (readonly ? 0 : S_IWUSR); 463} 464 465static const struct attribute_group jc42_group = { 466 .attrs = jc42_attributes, 467 .is_visible = jc42_attribute_mode, 468}; 469 470/* Return 0 if detection is successful, -ENODEV otherwise */ 471static int jc42_detect(struct i2c_client *new_client, 472 struct i2c_board_info *info) 473{ 474 struct i2c_adapter *adapter = new_client->adapter; 475 int i, config, cap, manid, devid; 476 477 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | 478 I2C_FUNC_SMBUS_WORD_DATA)) 479 return -ENODEV; 480 481 cap = jc42_read_value(new_client, JC42_REG_CAP); 482 config = jc42_read_value(new_client, JC42_REG_CONFIG); 483 manid = jc42_read_value(new_client, JC42_REG_MANID); 484 devid = jc42_read_value(new_client, JC42_REG_DEVICEID); 485 486 if (cap < 0 || config < 0 || manid < 0 || devid < 0) 487 return -ENODEV; 488 489 if ((cap & 0xff00) || (config & 0xf800)) 490 return -ENODEV; 491 492 for (i = 0; i < ARRAY_SIZE(jc42_chips); i++) { 493 struct jc42_chips *chip = &jc42_chips[i]; 494 if (manid == chip->manid && 495 (devid & chip->devid_mask) == chip->devid) { 496 strlcpy(info->type, "jc42", I2C_NAME_SIZE); 497 return 0; 498 } 499 } 500 return -ENODEV; 501} 502 503static int jc42_probe(struct i2c_client *new_client, 504 const struct i2c_device_id *id) 505{ 506 struct jc42_data *data; 507 int config, cap, err; 508 509 data = kzalloc(sizeof(struct jc42_data), GFP_KERNEL); 510 if (!data) { 511 err = -ENOMEM; 512 goto exit; 513 } 514 515 i2c_set_clientdata(new_client, data); 516 mutex_init(&data->update_lock); 517 518 cap = jc42_read_value(new_client, JC42_REG_CAP); 519 if (cap < 0) { 520 err = -EINVAL; 521 goto exit_free; 522 } 523 data->extended = !!(cap & JC42_CAP_RANGE); 524 525 config = jc42_read_value(new_client, JC42_REG_CONFIG); 526 if (config < 0) { 527 err = -EINVAL; 528 goto exit_free; 529 } 530 data->orig_config = config; 531 if (config & JC42_CFG_SHUTDOWN) { 532 config &= ~JC42_CFG_SHUTDOWN; 533 jc42_write_value(new_client, JC42_REG_CONFIG, config); 534 } 535 data->config = config; 536 537 /* Register sysfs hooks */ 538 err = sysfs_create_group(&new_client->dev.kobj, &jc42_group); 539 if (err) 540 goto exit_free; 541 542 data->hwmon_dev = hwmon_device_register(&new_client->dev); 543 if (IS_ERR(data->hwmon_dev)) { 544 err = PTR_ERR(data->hwmon_dev); 545 goto exit_remove; 546 } 547 548 return 0; 549 550exit_remove: 551 sysfs_remove_group(&new_client->dev.kobj, &jc42_group); 552exit_free: 553 kfree(data); 554exit: 555 return err; 556} 557 558static int jc42_remove(struct i2c_client *client) 559{ 560 struct jc42_data *data = i2c_get_clientdata(client); 561 hwmon_device_unregister(data->hwmon_dev); 562 sysfs_remove_group(&client->dev.kobj, &jc42_group); 563 if (data->config != data->orig_config) 564 jc42_write_value(client, JC42_REG_CONFIG, data->orig_config); 565 kfree(data); 566 return 0; 567} 568 569/* All registers are word-sized. */ 570static int jc42_read_value(struct i2c_client *client, u8 reg) 571{ 572 int ret = i2c_smbus_read_word_data(client, reg); 573 if (ret < 0) 574 return ret; 575 return swab16(ret); 576} 577 578static int jc42_write_value(struct i2c_client *client, u8 reg, u16 value) 579{ 580 return i2c_smbus_write_word_data(client, reg, swab16(value)); 581} 582 583static struct jc42_data *jc42_update_device(struct device *dev) 584{ 585 struct i2c_client *client = to_i2c_client(dev); 586 struct jc42_data *data = i2c_get_clientdata(client); 587 struct jc42_data *ret = data; 588 int val; 589 590 mutex_lock(&data->update_lock); 591 592 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 593 val = jc42_read_value(client, JC42_REG_TEMP); 594 if (val < 0) { 595 ret = ERR_PTR(val); 596 goto abort; 597 } 598 data->temp_input = val; 599 600 val = jc42_read_value(client, JC42_REG_TEMP_CRITICAL); 601 if (val < 0) { 602 ret = ERR_PTR(val); 603 goto abort; 604 } 605 data->temp_crit = val; 606 607 val = jc42_read_value(client, JC42_REG_TEMP_LOWER); 608 if (val < 0) { 609 ret = ERR_PTR(val); 610 goto abort; 611 } 612 data->temp_min = val; 613 614 val = jc42_read_value(client, JC42_REG_TEMP_UPPER); 615 if (val < 0) { 616 ret = ERR_PTR(val); 617 goto abort; 618 } 619 data->temp_max = val; 620 621 data->last_updated = jiffies; 622 data->valid = true; 623 } 624abort: 625 mutex_unlock(&data->update_lock); 626 return ret; 627} 628 629static int __init sensors_jc42_init(void) 630{ 631 return i2c_add_driver(&jc42_driver); 632} 633 634static void __exit sensors_jc42_exit(void) 635{ 636 i2c_del_driver(&jc42_driver); 637} 638 639MODULE_AUTHOR("Guenter Roeck <guenter.roeck@ericsson.com>"); 640MODULE_DESCRIPTION("JC42 driver"); 641MODULE_LICENSE("GPL"); 642 643module_init(sensors_jc42_init); 644module_exit(sensors_jc42_exit);