1/* 2 * pc87427.c - hardware monitoring driver for the 3 * National Semiconductor PC87427 Super-I/O chip 4 * Copyright (C) 2006 Jean Delvare <khali@linux-fr.org> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * Supports the following chips: 16 * 17 * Chip #vin #fan #pwm #temp devid 18 * PC87427 - 8 - - 0xF2 19 * 20 * This driver assumes that no more than one chip is present. 21 * Only fan inputs are supported so far, although the chip can do much more. 22 */ 23 24#include <linux/module.h> 25#include <linux/init.h> 26#include <linux/slab.h> 27#include <linux/jiffies.h> 28#include <linux/platform_device.h> 29#include <linux/hwmon.h> 30#include <linux/hwmon-sysfs.h> 31#include <linux/err.h> 32#include <linux/mutex.h> 33#include <linux/sysfs.h> 34#include <linux/ioport.h> 35#include <asm/io.h> 36 37static struct platform_device *pdev; 38 39#define DRVNAME "pc87427" 40 41/* The lock mutex protects both the I/O accesses (needed because the 42 device is using banked registers) and the register cache (needed to keep 43 the data in the registers and the cache in sync at any time). */ 44struct pc87427_data { 45 struct class_device *class_dev; 46 struct mutex lock; 47 int address[2]; 48 const char *name; 49 50 unsigned long last_updated; /* in jiffies */ 51 u8 fan_enabled; /* bit vector */ 52 u16 fan[8]; /* register values */ 53 u16 fan_min[8]; /* register values */ 54 u8 fan_status[8]; /* register values */ 55}; 56 57/* 58 * Super-I/O registers and operations 59 */ 60 61#define SIOREG_LDSEL 0x07 /* Logical device select */ 62#define SIOREG_DEVID 0x20 /* Device ID */ 63#define SIOREG_ACT 0x30 /* Device activation */ 64#define SIOREG_MAP 0x50 /* I/O or memory mapping */ 65#define SIOREG_IOBASE 0x60 /* I/O base address */ 66 67static const u8 logdev[2] = { 0x09, 0x14 }; 68static const char *logdev_str[2] = { DRVNAME " FMC", DRVNAME " HMC" }; 69#define LD_FAN 0 70#define LD_IN 1 71#define LD_TEMP 1 72 73static inline void superio_outb(int sioaddr, int reg, int val) 74{ 75 outb(reg, sioaddr); 76 outb(val, sioaddr + 1); 77} 78 79static inline int superio_inb(int sioaddr, int reg) 80{ 81 outb(reg, sioaddr); 82 return inb(sioaddr + 1); 83} 84 85static inline void superio_exit(int sioaddr) 86{ 87 outb(0x02, sioaddr); 88 outb(0x02, sioaddr + 1); 89} 90 91/* 92 * Logical devices 93 */ 94 95#define REGION_LENGTH 32 96#define PC87427_REG_BANK 0x0f 97#define BANK_FM(nr) (nr) 98#define BANK_FT(nr) (0x08 + (nr)) 99#define BANK_FC(nr) (0x10 + (nr) * 2) 100 101/* 102 * I/O access functions 103 */ 104 105/* ldi is the logical device index */ 106static inline int pc87427_read8(struct pc87427_data *data, u8 ldi, u8 reg) 107{ 108 return inb(data->address[ldi] + reg); 109} 110 111/* Must be called with data->lock held, except during init */ 112static inline int pc87427_read8_bank(struct pc87427_data *data, u8 ldi, 113 u8 bank, u8 reg) 114{ 115 outb(bank, data->address[ldi] + PC87427_REG_BANK); 116 return inb(data->address[ldi] + reg); 117} 118 119/* Must be called with data->lock held, except during init */ 120static inline void pc87427_write8_bank(struct pc87427_data *data, u8 ldi, 121 u8 bank, u8 reg, u8 value) 122{ 123 outb(bank, data->address[ldi] + PC87427_REG_BANK); 124 outb(value, data->address[ldi] + reg); 125} 126 127/* 128 * Fan registers and conversions 129 */ 130 131/* fan data registers are 16-bit wide */ 132#define PC87427_REG_FAN 0x12 133#define PC87427_REG_FAN_MIN 0x14 134#define PC87427_REG_FAN_STATUS 0x10 135 136#define FAN_STATUS_STALL (1 << 3) 137#define FAN_STATUS_LOSPD (1 << 1) 138#define FAN_STATUS_MONEN (1 << 0) 139 140/* Dedicated function to read all registers related to a given fan input. 141 This saves us quite a few locks and bank selections. 142 Must be called with data->lock held. 143 nr is from 0 to 7 */ 144static void pc87427_readall_fan(struct pc87427_data *data, u8 nr) 145{ 146 int iobase = data->address[LD_FAN]; 147 148 outb(BANK_FM(nr), iobase + PC87427_REG_BANK); 149 data->fan[nr] = inw(iobase + PC87427_REG_FAN); 150 data->fan_min[nr] = inw(iobase + PC87427_REG_FAN_MIN); 151 data->fan_status[nr] = inb(iobase + PC87427_REG_FAN_STATUS); 152 /* Clear fan alarm bits */ 153 outb(data->fan_status[nr], iobase + PC87427_REG_FAN_STATUS); 154} 155 156/* The 2 LSB of fan speed registers are used for something different. 157 The actual 2 LSB of the measurements are not available. */ 158static inline unsigned long fan_from_reg(u16 reg) 159{ 160 reg &= 0xfffc; 161 if (reg == 0x0000 || reg == 0xfffc) 162 return 0; 163 return 5400000UL / reg; 164} 165 166/* The 2 LSB of the fan speed limit registers are not significant. */ 167static inline u16 fan_to_reg(unsigned long val) 168{ 169 if (val < 83UL) 170 return 0xffff; 171 if (val >= 1350000UL) 172 return 0x0004; 173 return ((1350000UL + val / 2) / val) << 2; 174} 175 176/* 177 * Data interface 178 */ 179 180static struct pc87427_data *pc87427_update_device(struct device *dev) 181{ 182 struct pc87427_data *data = dev_get_drvdata(dev); 183 int i; 184 185 mutex_lock(&data->lock); 186 if (!time_after(jiffies, data->last_updated + HZ) 187 && data->last_updated) 188 goto done; 189 190 /* Fans */ 191 for (i = 0; i < 8; i++) { 192 if (!(data->fan_enabled & (1 << i))) 193 continue; 194 pc87427_readall_fan(data, i); 195 } 196 data->last_updated = jiffies; 197 198done: 199 mutex_unlock(&data->lock); 200 return data; 201} 202 203static ssize_t show_fan_input(struct device *dev, struct device_attribute 204 *devattr, char *buf) 205{ 206 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 207 struct pc87427_data *data = pc87427_update_device(dev); 208 int nr = attr->index; 209 210 return sprintf(buf, "%lu\n", fan_from_reg(data->fan[nr])); 211} 212 213static ssize_t show_fan_min(struct device *dev, struct device_attribute 214 *devattr, char *buf) 215{ 216 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 217 struct pc87427_data *data = pc87427_update_device(dev); 218 int nr = attr->index; 219 220 return sprintf(buf, "%lu\n", fan_from_reg(data->fan_min[nr])); 221} 222 223static ssize_t show_fan_alarm(struct device *dev, struct device_attribute 224 *devattr, char *buf) 225{ 226 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 227 struct pc87427_data *data = pc87427_update_device(dev); 228 int nr = attr->index; 229 230 return sprintf(buf, "%d\n", !!(data->fan_status[nr] 231 & FAN_STATUS_LOSPD)); 232} 233 234static ssize_t show_fan_fault(struct device *dev, struct device_attribute 235 *devattr, char *buf) 236{ 237 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 238 struct pc87427_data *data = pc87427_update_device(dev); 239 int nr = attr->index; 240 241 return sprintf(buf, "%d\n", !!(data->fan_status[nr] 242 & FAN_STATUS_STALL)); 243} 244 245static ssize_t set_fan_min(struct device *dev, struct device_attribute 246 *devattr, const char *buf, size_t count) 247{ 248 struct pc87427_data *data = dev_get_drvdata(dev); 249 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 250 int nr = attr->index; 251 unsigned long val = simple_strtoul(buf, NULL, 10); 252 int iobase = data->address[LD_FAN]; 253 254 mutex_lock(&data->lock); 255 outb(BANK_FM(nr), iobase + PC87427_REG_BANK); 256 /* The low speed limit registers are read-only while monitoring 257 is enabled, so we have to disable monitoring, then change the 258 limit, and finally enable monitoring again. */ 259 outb(0, iobase + PC87427_REG_FAN_STATUS); 260 data->fan_min[nr] = fan_to_reg(val); 261 outw(data->fan_min[nr], iobase + PC87427_REG_FAN_MIN); 262 outb(FAN_STATUS_MONEN, iobase + PC87427_REG_FAN_STATUS); 263 mutex_unlock(&data->lock); 264 265 return count; 266} 267 268static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0); 269static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1); 270static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan_input, NULL, 2); 271static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan_input, NULL, 3); 272static SENSOR_DEVICE_ATTR(fan5_input, S_IRUGO, show_fan_input, NULL, 4); 273static SENSOR_DEVICE_ATTR(fan6_input, S_IRUGO, show_fan_input, NULL, 5); 274static SENSOR_DEVICE_ATTR(fan7_input, S_IRUGO, show_fan_input, NULL, 6); 275static SENSOR_DEVICE_ATTR(fan8_input, S_IRUGO, show_fan_input, NULL, 7); 276 277static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, 278 show_fan_min, set_fan_min, 0); 279static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, 280 show_fan_min, set_fan_min, 1); 281static SENSOR_DEVICE_ATTR(fan3_min, S_IWUSR | S_IRUGO, 282 show_fan_min, set_fan_min, 2); 283static SENSOR_DEVICE_ATTR(fan4_min, S_IWUSR | S_IRUGO, 284 show_fan_min, set_fan_min, 3); 285static SENSOR_DEVICE_ATTR(fan5_min, S_IWUSR | S_IRUGO, 286 show_fan_min, set_fan_min, 4); 287static SENSOR_DEVICE_ATTR(fan6_min, S_IWUSR | S_IRUGO, 288 show_fan_min, set_fan_min, 5); 289static SENSOR_DEVICE_ATTR(fan7_min, S_IWUSR | S_IRUGO, 290 show_fan_min, set_fan_min, 6); 291static SENSOR_DEVICE_ATTR(fan8_min, S_IWUSR | S_IRUGO, 292 show_fan_min, set_fan_min, 7); 293 294static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_fan_alarm, NULL, 0); 295static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_fan_alarm, NULL, 1); 296static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_fan_alarm, NULL, 2); 297static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_fan_alarm, NULL, 3); 298static SENSOR_DEVICE_ATTR(fan5_alarm, S_IRUGO, show_fan_alarm, NULL, 4); 299static SENSOR_DEVICE_ATTR(fan6_alarm, S_IRUGO, show_fan_alarm, NULL, 5); 300static SENSOR_DEVICE_ATTR(fan7_alarm, S_IRUGO, show_fan_alarm, NULL, 6); 301static SENSOR_DEVICE_ATTR(fan8_alarm, S_IRUGO, show_fan_alarm, NULL, 7); 302 303static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL, 0); 304static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_fan_fault, NULL, 1); 305static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, show_fan_fault, NULL, 2); 306static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, show_fan_fault, NULL, 3); 307static SENSOR_DEVICE_ATTR(fan5_fault, S_IRUGO, show_fan_fault, NULL, 4); 308static SENSOR_DEVICE_ATTR(fan6_fault, S_IRUGO, show_fan_fault, NULL, 5); 309static SENSOR_DEVICE_ATTR(fan7_fault, S_IRUGO, show_fan_fault, NULL, 6); 310static SENSOR_DEVICE_ATTR(fan8_fault, S_IRUGO, show_fan_fault, NULL, 7); 311 312static struct attribute *pc87427_attributes_fan[8][5] = { 313 { 314 &sensor_dev_attr_fan1_input.dev_attr.attr, 315 &sensor_dev_attr_fan1_min.dev_attr.attr, 316 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 317 &sensor_dev_attr_fan1_fault.dev_attr.attr, 318 NULL 319 }, { 320 &sensor_dev_attr_fan2_input.dev_attr.attr, 321 &sensor_dev_attr_fan2_min.dev_attr.attr, 322 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 323 &sensor_dev_attr_fan2_fault.dev_attr.attr, 324 NULL 325 }, { 326 &sensor_dev_attr_fan3_input.dev_attr.attr, 327 &sensor_dev_attr_fan3_min.dev_attr.attr, 328 &sensor_dev_attr_fan3_alarm.dev_attr.attr, 329 &sensor_dev_attr_fan3_fault.dev_attr.attr, 330 NULL 331 }, { 332 &sensor_dev_attr_fan4_input.dev_attr.attr, 333 &sensor_dev_attr_fan4_min.dev_attr.attr, 334 &sensor_dev_attr_fan4_alarm.dev_attr.attr, 335 &sensor_dev_attr_fan4_fault.dev_attr.attr, 336 NULL 337 }, { 338 &sensor_dev_attr_fan5_input.dev_attr.attr, 339 &sensor_dev_attr_fan5_min.dev_attr.attr, 340 &sensor_dev_attr_fan5_alarm.dev_attr.attr, 341 &sensor_dev_attr_fan5_fault.dev_attr.attr, 342 NULL 343 }, { 344 &sensor_dev_attr_fan6_input.dev_attr.attr, 345 &sensor_dev_attr_fan6_min.dev_attr.attr, 346 &sensor_dev_attr_fan6_alarm.dev_attr.attr, 347 &sensor_dev_attr_fan6_fault.dev_attr.attr, 348 NULL 349 }, { 350 &sensor_dev_attr_fan7_input.dev_attr.attr, 351 &sensor_dev_attr_fan7_min.dev_attr.attr, 352 &sensor_dev_attr_fan7_alarm.dev_attr.attr, 353 &sensor_dev_attr_fan7_fault.dev_attr.attr, 354 NULL 355 }, { 356 &sensor_dev_attr_fan8_input.dev_attr.attr, 357 &sensor_dev_attr_fan8_min.dev_attr.attr, 358 &sensor_dev_attr_fan8_alarm.dev_attr.attr, 359 &sensor_dev_attr_fan8_fault.dev_attr.attr, 360 NULL 361 } 362}; 363 364static const struct attribute_group pc87427_group_fan[8] = { 365 { .attrs = pc87427_attributes_fan[0] }, 366 { .attrs = pc87427_attributes_fan[1] }, 367 { .attrs = pc87427_attributes_fan[2] }, 368 { .attrs = pc87427_attributes_fan[3] }, 369 { .attrs = pc87427_attributes_fan[4] }, 370 { .attrs = pc87427_attributes_fan[5] }, 371 { .attrs = pc87427_attributes_fan[6] }, 372 { .attrs = pc87427_attributes_fan[7] }, 373}; 374 375static ssize_t show_name(struct device *dev, struct device_attribute 376 *devattr, char *buf) 377{ 378 struct pc87427_data *data = dev_get_drvdata(dev); 379 380 return sprintf(buf, "%s\n", data->name); 381} 382static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 383 384 385/* 386 * Device detection, attach and detach 387 */ 388 389static void __devinit pc87427_init_device(struct device *dev) 390{ 391 struct pc87427_data *data = dev_get_drvdata(dev); 392 int i; 393 u8 reg; 394 395 /* The FMC module should be ready */ 396 reg = pc87427_read8(data, LD_FAN, PC87427_REG_BANK); 397 if (!(reg & 0x80)) 398 dev_warn(dev, "FMC module not ready!\n"); 399 400 /* Check which fans are enabled */ 401 for (i = 0; i < 8; i++) { 402 reg = pc87427_read8_bank(data, LD_FAN, BANK_FM(i), 403 PC87427_REG_FAN_STATUS); 404 if (reg & FAN_STATUS_MONEN) 405 data->fan_enabled |= (1 << i); 406 } 407 408 if (!data->fan_enabled) { 409 dev_dbg(dev, "Enabling all fan inputs\n"); 410 for (i = 0; i < 8; i++) 411 pc87427_write8_bank(data, LD_FAN, BANK_FM(i), 412 PC87427_REG_FAN_STATUS, 413 FAN_STATUS_MONEN); 414 data->fan_enabled = 0xff; 415 } 416} 417 418static int __devinit pc87427_probe(struct platform_device *pdev) 419{ 420 struct pc87427_data *data; 421 struct resource *res; 422 int i, err; 423 424 if (!(data = kzalloc(sizeof(struct pc87427_data), GFP_KERNEL))) { 425 err = -ENOMEM; 426 printk(KERN_ERR DRVNAME ": Out of memory\n"); 427 goto exit; 428 } 429 430 /* This will need to be revisited when we add support for 431 temperature and voltage monitoring. */ 432 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 433 if (!request_region(res->start, res->end - res->start + 1, DRVNAME)) { 434 err = -EBUSY; 435 dev_err(&pdev->dev, "Failed to request region 0x%lx-0x%lx\n", 436 (unsigned long)res->start, (unsigned long)res->end); 437 goto exit_kfree; 438 } 439 data->address[0] = res->start; 440 441 mutex_init(&data->lock); 442 data->name = "pc87427"; 443 platform_set_drvdata(pdev, data); 444 pc87427_init_device(&pdev->dev); 445 446 /* Register sysfs hooks */ 447 if ((err = device_create_file(&pdev->dev, &dev_attr_name))) 448 goto exit_release_region; 449 for (i = 0; i < 8; i++) { 450 if (!(data->fan_enabled & (1 << i))) 451 continue; 452 if ((err = sysfs_create_group(&pdev->dev.kobj, 453 &pc87427_group_fan[i]))) 454 goto exit_remove_files; 455 } 456 457 data->class_dev = hwmon_device_register(&pdev->dev); 458 if (IS_ERR(data->class_dev)) { 459 err = PTR_ERR(data->class_dev); 460 dev_err(&pdev->dev, "Class registration failed (%d)\n", err); 461 goto exit_remove_files; 462 } 463 464 return 0; 465 466exit_remove_files: 467 for (i = 0; i < 8; i++) { 468 if (!(data->fan_enabled & (1 << i))) 469 continue; 470 sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_fan[i]); 471 } 472exit_release_region: 473 release_region(res->start, res->end - res->start + 1); 474exit_kfree: 475 platform_set_drvdata(pdev, NULL); 476 kfree(data); 477exit: 478 return err; 479} 480 481static int __devexit pc87427_remove(struct platform_device *pdev) 482{ 483 struct pc87427_data *data = platform_get_drvdata(pdev); 484 struct resource *res; 485 int i; 486 487 platform_set_drvdata(pdev, NULL); 488 hwmon_device_unregister(data->class_dev); 489 device_remove_file(&pdev->dev, &dev_attr_name); 490 for (i = 0; i < 8; i++) { 491 if (!(data->fan_enabled & (1 << i))) 492 continue; 493 sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_fan[i]); 494 } 495 kfree(data); 496 497 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 498 release_region(res->start, res->end - res->start + 1); 499 500 return 0; 501} 502 503 504static struct platform_driver pc87427_driver = { 505 .driver = { 506 .owner = THIS_MODULE, 507 .name = DRVNAME, 508 }, 509 .probe = pc87427_probe, 510 .remove = __devexit_p(pc87427_remove), 511}; 512 513static int __init pc87427_device_add(unsigned short address) 514{ 515 struct resource res = { 516 .start = address, 517 .end = address + REGION_LENGTH - 1, 518 .name = logdev_str[0], 519 .flags = IORESOURCE_IO, 520 }; 521 int err; 522 523 pdev = platform_device_alloc(DRVNAME, address); 524 if (!pdev) { 525 err = -ENOMEM; 526 printk(KERN_ERR DRVNAME ": Device allocation failed\n"); 527 goto exit; 528 } 529 530 err = platform_device_add_resources(pdev, &res, 1); 531 if (err) { 532 printk(KERN_ERR DRVNAME ": Device resource addition failed " 533 "(%d)\n", err); 534 goto exit_device_put; 535 } 536 537 err = platform_device_add(pdev); 538 if (err) { 539 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n", 540 err); 541 goto exit_device_put; 542 } 543 544 return 0; 545 546exit_device_put: 547 platform_device_put(pdev); 548exit: 549 return err; 550} 551 552static int __init pc87427_find(int sioaddr, unsigned short *address) 553{ 554 u16 val; 555 int i, err = 0; 556 557 /* Identify device */ 558 val = superio_inb(sioaddr, SIOREG_DEVID); 559 if (val != 0xf2) { /* PC87427 */ 560 err = -ENODEV; 561 goto exit; 562 } 563 564 for (i = 0; i < 2; i++) { 565 address[i] = 0; 566 /* Select logical device */ 567 superio_outb(sioaddr, SIOREG_LDSEL, logdev[i]); 568 569 val = superio_inb(sioaddr, SIOREG_ACT); 570 if (!(val & 0x01)) { 571 printk(KERN_INFO DRVNAME ": Logical device 0x%02x " 572 "not activated\n", logdev[i]); 573 continue; 574 } 575 576 val = superio_inb(sioaddr, SIOREG_MAP); 577 if (val & 0x01) { 578 printk(KERN_WARNING DRVNAME ": Logical device 0x%02x " 579 "is memory-mapped, can't use\n", logdev[i]); 580 continue; 581 } 582 583 val = (superio_inb(sioaddr, SIOREG_IOBASE) << 8) 584 | superio_inb(sioaddr, SIOREG_IOBASE + 1); 585 if (!val) { 586 printk(KERN_INFO DRVNAME ": I/O base address not set " 587 "for logical device 0x%02x\n", logdev[i]); 588 continue; 589 } 590 address[i] = val; 591 } 592 593exit: 594 superio_exit(sioaddr); 595 return err; 596} 597 598static int __init pc87427_init(void) 599{ 600 int err; 601 unsigned short address[2]; 602 603 if (pc87427_find(0x2e, address) 604 && pc87427_find(0x4e, address)) 605 return -ENODEV; 606 607 /* For now the driver only handles fans so we only care about the 608 first address. */ 609 if (!address[0]) 610 return -ENODEV; 611 612 err = platform_driver_register(&pc87427_driver); 613 if (err) 614 goto exit; 615 616 /* Sets global pdev as a side effect */ 617 err = pc87427_device_add(address[0]); 618 if (err) 619 goto exit_driver; 620 621 return 0; 622 623exit_driver: 624 platform_driver_unregister(&pc87427_driver); 625exit: 626 return err; 627} 628 629static void __exit pc87427_exit(void) 630{ 631 platform_device_unregister(pdev); 632 platform_driver_unregister(&pc87427_driver); 633} 634 635MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); 636MODULE_DESCRIPTION("PC87427 hardware monitoring driver"); 637MODULE_LICENSE("GPL"); 638 639module_init(pc87427_init); 640module_exit(pc87427_exit); 641