smsc47m1.c revision 6091780eba5d195213747b515a62211ac97641f1
1/* 2 smsc47m1.c - Part of lm_sensors, Linux kernel modules 3 for hardware monitoring 4 5 Supports the SMSC LPC47B27x, LPC47M10x, LPC47M112, LPC47M13x, 6 LPC47M14x, LPC47M15x, LPC47M192 and LPC47M997 Super-I/O chips. 7 8 Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com> 9 Copyright (C) 2004 Jean Delvare <khali@linux-fr.org> 10 Ported to Linux 2.6 by Gabriele Gorla <gorlik@yahoo.com> 11 and Jean Delvare 12 13 This program is free software; you can redistribute it and/or modify 14 it under the terms of the GNU General Public License as published by 15 the Free Software Foundation; either version 2 of the License, or 16 (at your option) any later version. 17 18 This program is distributed in the hope that it will be useful, 19 but WITHOUT ANY WARRANTY; without even the implied warranty of 20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 GNU General Public License for more details. 22 23 You should have received a copy of the GNU General Public License 24 along with this program; if not, write to the Free Software 25 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 26*/ 27 28#include <linux/module.h> 29#include <linux/slab.h> 30#include <linux/ioport.h> 31#include <linux/jiffies.h> 32#include <linux/i2c.h> 33#include <linux/i2c-isa.h> 34#include <linux/hwmon.h> 35#include <linux/err.h> 36#include <linux/init.h> 37#include <linux/mutex.h> 38#include <linux/sysfs.h> 39#include <asm/io.h> 40 41/* Address is autodetected, there is no default value */ 42static unsigned short address; 43 44/* Super-I/0 registers and commands */ 45 46#define REG 0x2e /* The register to read/write */ 47#define VAL 0x2f /* The value to read/write */ 48 49static inline void 50superio_outb(int reg, int val) 51{ 52 outb(reg, REG); 53 outb(val, VAL); 54} 55 56static inline int 57superio_inb(int reg) 58{ 59 outb(reg, REG); 60 return inb(VAL); 61} 62 63/* logical device for fans is 0x0A */ 64#define superio_select() superio_outb(0x07, 0x0A) 65 66static inline void 67superio_enter(void) 68{ 69 outb(0x55, REG); 70} 71 72static inline void 73superio_exit(void) 74{ 75 outb(0xAA, REG); 76} 77 78#define SUPERIO_REG_ACT 0x30 79#define SUPERIO_REG_BASE 0x60 80#define SUPERIO_REG_DEVID 0x20 81 82/* Logical device registers */ 83 84#define SMSC_EXTENT 0x80 85 86/* nr is 0 or 1 in the macros below */ 87#define SMSC47M1_REG_ALARM 0x04 88#define SMSC47M1_REG_TPIN(nr) (0x34 - (nr)) 89#define SMSC47M1_REG_PPIN(nr) (0x36 - (nr)) 90#define SMSC47M1_REG_PWM(nr) (0x56 + (nr)) 91#define SMSC47M1_REG_FANDIV 0x58 92#define SMSC47M1_REG_FAN(nr) (0x59 + (nr)) 93#define SMSC47M1_REG_FAN_PRELOAD(nr) (0x5B + (nr)) 94 95#define MIN_FROM_REG(reg,div) ((reg)>=192 ? 0 : \ 96 983040/((192-(reg))*(div))) 97#define FAN_FROM_REG(reg,div,preload) ((reg)<=(preload) || (reg)==255 ? 0 : \ 98 983040/(((reg)-(preload))*(div))) 99#define DIV_FROM_REG(reg) (1 << (reg)) 100#define PWM_FROM_REG(reg) (((reg) & 0x7E) << 1) 101#define PWM_EN_FROM_REG(reg) ((~(reg)) & 0x01) 102#define PWM_TO_REG(reg) (((reg) >> 1) & 0x7E) 103 104struct smsc47m1_data { 105 struct i2c_client client; 106 struct class_device *class_dev; 107 struct mutex lock; 108 109 struct mutex update_lock; 110 unsigned long last_updated; /* In jiffies */ 111 112 u8 fan[2]; /* Register value */ 113 u8 fan_preload[2]; /* Register value */ 114 u8 fan_div[2]; /* Register encoding, shifted right */ 115 u8 alarms; /* Register encoding */ 116 u8 pwm[2]; /* Register value (bit 7 is enable) */ 117}; 118 119 120static int smsc47m1_detect(struct i2c_adapter *adapter); 121static int smsc47m1_detach_client(struct i2c_client *client); 122 123static int smsc47m1_read_value(struct i2c_client *client, u8 reg); 124static void smsc47m1_write_value(struct i2c_client *client, u8 reg, u8 value); 125 126static struct smsc47m1_data *smsc47m1_update_device(struct device *dev, 127 int init); 128 129 130static struct i2c_driver smsc47m1_driver = { 131 .driver = { 132 .owner = THIS_MODULE, 133 .name = "smsc47m1", 134 }, 135 .attach_adapter = smsc47m1_detect, 136 .detach_client = smsc47m1_detach_client, 137}; 138 139/* nr is 0 or 1 in the callback functions below */ 140 141static ssize_t get_fan(struct device *dev, char *buf, int nr) 142{ 143 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 144 /* This chip (stupidly) stops monitoring fan speed if PWM is 145 enabled and duty cycle is 0%. This is fine if the monitoring 146 and control concern the same fan, but troublesome if they are 147 not (which could as well happen). */ 148 int rpm = (data->pwm[nr] & 0x7F) == 0x00 ? 0 : 149 FAN_FROM_REG(data->fan[nr], 150 DIV_FROM_REG(data->fan_div[nr]), 151 data->fan_preload[nr]); 152 return sprintf(buf, "%d\n", rpm); 153} 154 155static ssize_t get_fan_min(struct device *dev, char *buf, int nr) 156{ 157 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 158 int rpm = MIN_FROM_REG(data->fan_preload[nr], 159 DIV_FROM_REG(data->fan_div[nr])); 160 return sprintf(buf, "%d\n", rpm); 161} 162 163static ssize_t get_fan_div(struct device *dev, char *buf, int nr) 164{ 165 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 166 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr])); 167} 168 169static ssize_t get_pwm(struct device *dev, char *buf, int nr) 170{ 171 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 172 return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[nr])); 173} 174 175static ssize_t get_pwm_en(struct device *dev, char *buf, int nr) 176{ 177 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 178 return sprintf(buf, "%d\n", PWM_EN_FROM_REG(data->pwm[nr])); 179} 180 181static ssize_t get_alarms(struct device *dev, struct device_attribute *attr, char *buf) 182{ 183 struct smsc47m1_data *data = smsc47m1_update_device(dev, 0); 184 return sprintf(buf, "%d\n", data->alarms); 185} 186 187static ssize_t set_fan_min(struct device *dev, const char *buf, 188 size_t count, int nr) 189{ 190 struct i2c_client *client = to_i2c_client(dev); 191 struct smsc47m1_data *data = i2c_get_clientdata(client); 192 long rpmdiv, val = simple_strtol(buf, NULL, 10); 193 194 mutex_lock(&data->update_lock); 195 rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]); 196 197 if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) { 198 mutex_unlock(&data->update_lock); 199 return -EINVAL; 200 } 201 202 data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv); 203 smsc47m1_write_value(client, SMSC47M1_REG_FAN_PRELOAD(nr), 204 data->fan_preload[nr]); 205 mutex_unlock(&data->update_lock); 206 207 return count; 208} 209 210/* Note: we save and restore the fan minimum here, because its value is 211 determined in part by the fan clock divider. This follows the principle 212 of least surprise; the user doesn't expect the fan minimum to change just 213 because the divider changed. */ 214static ssize_t set_fan_div(struct device *dev, const char *buf, 215 size_t count, int nr) 216{ 217 struct i2c_client *client = to_i2c_client(dev); 218 struct smsc47m1_data *data = i2c_get_clientdata(client); 219 220 long new_div = simple_strtol(buf, NULL, 10), tmp; 221 u8 old_div = DIV_FROM_REG(data->fan_div[nr]); 222 223 if (new_div == old_div) /* No change */ 224 return count; 225 226 mutex_lock(&data->update_lock); 227 switch (new_div) { 228 case 1: data->fan_div[nr] = 0; break; 229 case 2: data->fan_div[nr] = 1; break; 230 case 4: data->fan_div[nr] = 2; break; 231 case 8: data->fan_div[nr] = 3; break; 232 default: 233 mutex_unlock(&data->update_lock); 234 return -EINVAL; 235 } 236 237 tmp = smsc47m1_read_value(client, SMSC47M1_REG_FANDIV) & 0x0F; 238 tmp |= (data->fan_div[0] << 4) | (data->fan_div[1] << 6); 239 smsc47m1_write_value(client, SMSC47M1_REG_FANDIV, tmp); 240 241 /* Preserve fan min */ 242 tmp = 192 - (old_div * (192 - data->fan_preload[nr]) 243 + new_div / 2) / new_div; 244 data->fan_preload[nr] = SENSORS_LIMIT(tmp, 0, 191); 245 smsc47m1_write_value(client, SMSC47M1_REG_FAN_PRELOAD(nr), 246 data->fan_preload[nr]); 247 mutex_unlock(&data->update_lock); 248 249 return count; 250} 251 252static ssize_t set_pwm(struct device *dev, const char *buf, 253 size_t count, int nr) 254{ 255 struct i2c_client *client = to_i2c_client(dev); 256 struct smsc47m1_data *data = i2c_get_clientdata(client); 257 258 long val = simple_strtol(buf, NULL, 10); 259 260 if (val < 0 || val > 255) 261 return -EINVAL; 262 263 mutex_lock(&data->update_lock); 264 data->pwm[nr] &= 0x81; /* Preserve additional bits */ 265 data->pwm[nr] |= PWM_TO_REG(val); 266 smsc47m1_write_value(client, SMSC47M1_REG_PWM(nr), 267 data->pwm[nr]); 268 mutex_unlock(&data->update_lock); 269 270 return count; 271} 272 273static ssize_t set_pwm_en(struct device *dev, const char *buf, 274 size_t count, int nr) 275{ 276 struct i2c_client *client = to_i2c_client(dev); 277 struct smsc47m1_data *data = i2c_get_clientdata(client); 278 279 long val = simple_strtol(buf, NULL, 10); 280 281 if (val != 0 && val != 1) 282 return -EINVAL; 283 284 mutex_lock(&data->update_lock); 285 data->pwm[nr] &= 0xFE; /* preserve the other bits */ 286 data->pwm[nr] |= !val; 287 smsc47m1_write_value(client, SMSC47M1_REG_PWM(nr), 288 data->pwm[nr]); 289 mutex_unlock(&data->update_lock); 290 291 return count; 292} 293 294#define fan_present(offset) \ 295static ssize_t get_fan##offset (struct device *dev, struct device_attribute *attr, char *buf) \ 296{ \ 297 return get_fan(dev, buf, offset - 1); \ 298} \ 299static ssize_t get_fan##offset##_min (struct device *dev, struct device_attribute *attr, char *buf) \ 300{ \ 301 return get_fan_min(dev, buf, offset - 1); \ 302} \ 303static ssize_t set_fan##offset##_min (struct device *dev, struct device_attribute *attr, \ 304 const char *buf, size_t count) \ 305{ \ 306 return set_fan_min(dev, buf, count, offset - 1); \ 307} \ 308static ssize_t get_fan##offset##_div (struct device *dev, struct device_attribute *attr, char *buf) \ 309{ \ 310 return get_fan_div(dev, buf, offset - 1); \ 311} \ 312static ssize_t set_fan##offset##_div (struct device *dev, struct device_attribute *attr, \ 313 const char *buf, size_t count) \ 314{ \ 315 return set_fan_div(dev, buf, count, offset - 1); \ 316} \ 317static ssize_t get_pwm##offset (struct device *dev, struct device_attribute *attr, char *buf) \ 318{ \ 319 return get_pwm(dev, buf, offset - 1); \ 320} \ 321static ssize_t set_pwm##offset (struct device *dev, struct device_attribute *attr, \ 322 const char *buf, size_t count) \ 323{ \ 324 return set_pwm(dev, buf, count, offset - 1); \ 325} \ 326static ssize_t get_pwm##offset##_en (struct device *dev, struct device_attribute *attr, char *buf) \ 327{ \ 328 return get_pwm_en(dev, buf, offset - 1); \ 329} \ 330static ssize_t set_pwm##offset##_en (struct device *dev, struct device_attribute *attr, \ 331 const char *buf, size_t count) \ 332{ \ 333 return set_pwm_en(dev, buf, count, offset - 1); \ 334} \ 335static DEVICE_ATTR(fan##offset##_input, S_IRUGO, get_fan##offset, \ 336 NULL); \ 337static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ 338 get_fan##offset##_min, set_fan##offset##_min); \ 339static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \ 340 get_fan##offset##_div, set_fan##offset##_div); \ 341static DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR, \ 342 get_pwm##offset, set_pwm##offset); \ 343static DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR, \ 344 get_pwm##offset##_en, set_pwm##offset##_en); 345 346fan_present(1); 347fan_present(2); 348 349static DEVICE_ATTR(alarms, S_IRUGO, get_alarms, NULL); 350 351/* Almost all sysfs files may or may not be created depending on the chip 352 setup so we create them individually. It is still convenient to define a 353 group to remove them all at once. */ 354static struct attribute *smsc47m1_attributes[] = { 355 &dev_attr_fan1_input.attr, 356 &dev_attr_fan1_min.attr, 357 &dev_attr_fan1_div.attr, 358 &dev_attr_fan2_input.attr, 359 &dev_attr_fan2_min.attr, 360 &dev_attr_fan2_div.attr, 361 362 &dev_attr_pwm1.attr, 363 &dev_attr_pwm1_enable.attr, 364 &dev_attr_pwm2.attr, 365 &dev_attr_pwm2_enable.attr, 366 367 &dev_attr_alarms.attr, 368 NULL 369}; 370 371static const struct attribute_group smsc47m1_group = { 372 .attrs = smsc47m1_attributes, 373}; 374 375static int __init smsc47m1_find(unsigned short *addr) 376{ 377 u8 val; 378 379 superio_enter(); 380 val = superio_inb(SUPERIO_REG_DEVID); 381 382 /* 383 * SMSC LPC47M10x/LPC47M112/LPC47M13x (device id 0x59), LPC47M14x 384 * (device id 0x5F) and LPC47B27x (device id 0x51) have fan control. 385 * The LPC47M15x and LPC47M192 chips "with hardware monitoring block" 386 * can do much more besides (device id 0x60). 387 * The LPC47M997 is undocumented, but seems to be compatible with 388 * the LPC47M192, and has the same device id. 389 */ 390 if (val == 0x51) 391 printk(KERN_INFO "smsc47m1: Found SMSC LPC47B27x\n"); 392 else if (val == 0x59) 393 printk(KERN_INFO "smsc47m1: Found SMSC " 394 "LPC47M10x/LPC47M112/LPC47M13x\n"); 395 else if (val == 0x5F) 396 printk(KERN_INFO "smsc47m1: Found SMSC LPC47M14x\n"); 397 else if (val == 0x60) 398 printk(KERN_INFO "smsc47m1: Found SMSC " 399 "LPC47M15x/LPC47M192/LPC47M997\n"); 400 else { 401 superio_exit(); 402 return -ENODEV; 403 } 404 405 superio_select(); 406 *addr = (superio_inb(SUPERIO_REG_BASE) << 8) 407 | superio_inb(SUPERIO_REG_BASE + 1); 408 val = superio_inb(SUPERIO_REG_ACT); 409 if (*addr == 0 || (val & 0x01) == 0) { 410 printk(KERN_INFO "smsc47m1: Device is disabled, will not use\n"); 411 superio_exit(); 412 return -ENODEV; 413 } 414 415 superio_exit(); 416 return 0; 417} 418 419static int smsc47m1_detect(struct i2c_adapter *adapter) 420{ 421 struct i2c_client *new_client; 422 struct smsc47m1_data *data; 423 int err = 0; 424 int fan1, fan2, pwm1, pwm2; 425 426 if (!request_region(address, SMSC_EXTENT, smsc47m1_driver.driver.name)) { 427 dev_err(&adapter->dev, "Region 0x%x already in use!\n", address); 428 return -EBUSY; 429 } 430 431 if (!(data = kzalloc(sizeof(struct smsc47m1_data), GFP_KERNEL))) { 432 err = -ENOMEM; 433 goto error_release; 434 } 435 436 new_client = &data->client; 437 i2c_set_clientdata(new_client, data); 438 new_client->addr = address; 439 mutex_init(&data->lock); 440 new_client->adapter = adapter; 441 new_client->driver = &smsc47m1_driver; 442 new_client->flags = 0; 443 444 strlcpy(new_client->name, "smsc47m1", I2C_NAME_SIZE); 445 mutex_init(&data->update_lock); 446 447 /* If no function is properly configured, there's no point in 448 actually registering the chip. */ 449 fan1 = (smsc47m1_read_value(new_client, SMSC47M1_REG_TPIN(0)) & 0x05) 450 == 0x05; 451 fan2 = (smsc47m1_read_value(new_client, SMSC47M1_REG_TPIN(1)) & 0x05) 452 == 0x05; 453 pwm1 = (smsc47m1_read_value(new_client, SMSC47M1_REG_PPIN(0)) & 0x05) 454 == 0x04; 455 pwm2 = (smsc47m1_read_value(new_client, SMSC47M1_REG_PPIN(1)) & 0x05) 456 == 0x04; 457 if (!(fan1 || fan2 || pwm1 || pwm2)) { 458 dev_warn(&adapter->dev, "Device at 0x%x is not configured, " 459 "will not use\n", new_client->addr); 460 err = -ENODEV; 461 goto error_free; 462 } 463 464 if ((err = i2c_attach_client(new_client))) 465 goto error_free; 466 467 /* Some values (fan min, clock dividers, pwm registers) may be 468 needed before any update is triggered, so we better read them 469 at least once here. We don't usually do it that way, but in 470 this particular case, manually reading 5 registers out of 8 471 doesn't make much sense and we're better using the existing 472 function. */ 473 smsc47m1_update_device(&new_client->dev, 1); 474 475 /* Register sysfs hooks */ 476 if (fan1) { 477 if ((err = device_create_file(&new_client->dev, 478 &dev_attr_fan1_input)) 479 || (err = device_create_file(&new_client->dev, 480 &dev_attr_fan1_min)) 481 || (err = device_create_file(&new_client->dev, 482 &dev_attr_fan1_div))) 483 goto error_remove_files; 484 } else 485 dev_dbg(&new_client->dev, "Fan 1 not enabled by hardware, " 486 "skipping\n"); 487 488 if (fan2) { 489 if ((err = device_create_file(&new_client->dev, 490 &dev_attr_fan2_input)) 491 || (err = device_create_file(&new_client->dev, 492 &dev_attr_fan2_min)) 493 || (err = device_create_file(&new_client->dev, 494 &dev_attr_fan2_div))) 495 goto error_remove_files; 496 } else 497 dev_dbg(&new_client->dev, "Fan 2 not enabled by hardware, " 498 "skipping\n"); 499 500 if (pwm1) { 501 if ((err = device_create_file(&new_client->dev, 502 &dev_attr_pwm1)) 503 || (err = device_create_file(&new_client->dev, 504 &dev_attr_pwm1_enable))) 505 goto error_remove_files; 506 } else 507 dev_dbg(&new_client->dev, "PWM 1 not enabled by hardware, " 508 "skipping\n"); 509 if (pwm2) { 510 if ((err = device_create_file(&new_client->dev, 511 &dev_attr_pwm2)) 512 || (err = device_create_file(&new_client->dev, 513 &dev_attr_pwm2_enable))) 514 goto error_remove_files; 515 } else 516 dev_dbg(&new_client->dev, "PWM 2 not enabled by hardware, " 517 "skipping\n"); 518 519 if ((err = device_create_file(&new_client->dev, &dev_attr_alarms))) 520 goto error_remove_files; 521 522 data->class_dev = hwmon_device_register(&new_client->dev); 523 if (IS_ERR(data->class_dev)) { 524 err = PTR_ERR(data->class_dev); 525 goto error_remove_files; 526 } 527 528 return 0; 529 530error_remove_files: 531 sysfs_remove_group(&new_client->dev.kobj, &smsc47m1_group); 532 i2c_detach_client(new_client); 533error_free: 534 kfree(data); 535error_release: 536 release_region(address, SMSC_EXTENT); 537 return err; 538} 539 540static int smsc47m1_detach_client(struct i2c_client *client) 541{ 542 struct smsc47m1_data *data = i2c_get_clientdata(client); 543 int err; 544 545 hwmon_device_unregister(data->class_dev); 546 sysfs_remove_group(&client->dev.kobj, &smsc47m1_group); 547 548 if ((err = i2c_detach_client(client))) 549 return err; 550 551 release_region(client->addr, SMSC_EXTENT); 552 kfree(data); 553 554 return 0; 555} 556 557static int smsc47m1_read_value(struct i2c_client *client, u8 reg) 558{ 559 int res; 560 561 mutex_lock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock); 562 res = inb_p(client->addr + reg); 563 mutex_unlock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock); 564 return res; 565} 566 567static void smsc47m1_write_value(struct i2c_client *client, u8 reg, u8 value) 568{ 569 mutex_lock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock); 570 outb_p(value, client->addr + reg); 571 mutex_unlock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock); 572} 573 574static struct smsc47m1_data *smsc47m1_update_device(struct device *dev, 575 int init) 576{ 577 struct i2c_client *client = to_i2c_client(dev); 578 struct smsc47m1_data *data = i2c_get_clientdata(client); 579 580 mutex_lock(&data->update_lock); 581 582 if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || init) { 583 int i; 584 585 for (i = 0; i < 2; i++) { 586 data->fan[i] = smsc47m1_read_value(client, 587 SMSC47M1_REG_FAN(i)); 588 data->fan_preload[i] = smsc47m1_read_value(client, 589 SMSC47M1_REG_FAN_PRELOAD(i)); 590 data->pwm[i] = smsc47m1_read_value(client, 591 SMSC47M1_REG_PWM(i)); 592 } 593 594 i = smsc47m1_read_value(client, SMSC47M1_REG_FANDIV); 595 data->fan_div[0] = (i >> 4) & 0x03; 596 data->fan_div[1] = i >> 6; 597 598 data->alarms = smsc47m1_read_value(client, 599 SMSC47M1_REG_ALARM) >> 6; 600 /* Clear alarms if needed */ 601 if (data->alarms) 602 smsc47m1_write_value(client, SMSC47M1_REG_ALARM, 0xC0); 603 604 data->last_updated = jiffies; 605 } 606 607 mutex_unlock(&data->update_lock); 608 return data; 609} 610 611static int __init sm_smsc47m1_init(void) 612{ 613 if (smsc47m1_find(&address)) { 614 return -ENODEV; 615 } 616 617 return i2c_isa_add_driver(&smsc47m1_driver); 618} 619 620static void __exit sm_smsc47m1_exit(void) 621{ 622 i2c_isa_del_driver(&smsc47m1_driver); 623} 624 625MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>"); 626MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver"); 627MODULE_LICENSE("GPL"); 628 629module_init(sm_smsc47m1_init); 630module_exit(sm_smsc47m1_exit); 631