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 <linux/acpi.h> 36 #include <linux/io.h> 37 38 static unsigned short force_id; 39 module_param(force_id, ushort, 0); 40 MODULE_PARM_DESC(force_id, "Override the detected device ID"); 41 42 static struct platform_device *pdev; 43 44 #define DRVNAME "pc87427" 45 46 /* The lock mutex protects both the I/O accesses (needed because the 47 device is using banked registers) and the register cache (needed to keep 48 the data in the registers and the cache in sync at any time). */ 49 struct pc87427_data { 50 struct device *hwmon_dev; 51 struct mutex lock; 52 int address[2]; 53 const char *name; 54 55 unsigned long last_updated; /* in jiffies */ 56 u8 fan_enabled; /* bit vector */ 57 u16 fan[8]; /* register values */ 58 u16 fan_min[8]; /* register values */ 59 u8 fan_status[8]; /* register values */ 60 }; 61 62 /* 63 * Super-I/O registers and operations 64 */ 65 66 #define SIOREG_LDSEL 0x07 /* Logical device select */ 67 #define SIOREG_DEVID 0x20 /* Device ID */ 68 #define SIOREG_ACT 0x30 /* Device activation */ 69 #define SIOREG_MAP 0x50 /* I/O or memory mapping */ 70 #define SIOREG_IOBASE 0x60 /* I/O base address */ 71 72 static const u8 logdev[2] = { 0x09, 0x14 }; 73 static const char *logdev_str[2] = { DRVNAME " FMC", DRVNAME " HMC" }; 74 #define LD_FAN 0 75 #define LD_IN 1 76 #define LD_TEMP 1 77 78 static inline void superio_outb(int sioaddr, int reg, int val) 79 { 80 outb(reg, sioaddr); 81 outb(val, sioaddr + 1); 82 } 83 84 static inline int superio_inb(int sioaddr, int reg) 85 { 86 outb(reg, sioaddr); 87 return inb(sioaddr + 1); 88 } 89 90 static inline void superio_exit(int sioaddr) 91 { 92 outb(0x02, sioaddr); 93 outb(0x02, sioaddr + 1); 94 } 95 96 /* 97 * Logical devices 98 */ 99 100 #define REGION_LENGTH 32 101 #define PC87427_REG_BANK 0x0f 102 #define BANK_FM(nr) (nr) 103 #define BANK_FT(nr) (0x08 + (nr)) 104 #define BANK_FC(nr) (0x10 + (nr) * 2) 105 106 /* 107 * I/O access functions 108 */ 109 110 /* ldi is the logical device index */ 111 static inline int pc87427_read8(struct pc87427_data *data, u8 ldi, u8 reg) 112 { 113 return inb(data->address[ldi] + reg); 114 } 115 116 /* Must be called with data->lock held, except during init */ 117 static inline int pc87427_read8_bank(struct pc87427_data *data, u8 ldi, 118 u8 bank, u8 reg) 119 { 120 outb(bank, data->address[ldi] + PC87427_REG_BANK); 121 return inb(data->address[ldi] + reg); 122 } 123 124 /* Must be called with data->lock held, except during init */ 125 static inline void pc87427_write8_bank(struct pc87427_data *data, u8 ldi, 126 u8 bank, u8 reg, u8 value) 127 { 128 outb(bank, data->address[ldi] + PC87427_REG_BANK); 129 outb(value, data->address[ldi] + reg); 130 } 131 132 /* 133 * Fan registers and conversions 134 */ 135 136 /* fan data registers are 16-bit wide */ 137 #define PC87427_REG_FAN 0x12 138 #define PC87427_REG_FAN_MIN 0x14 139 #define PC87427_REG_FAN_STATUS 0x10 140 141 #define FAN_STATUS_STALL (1 << 3) 142 #define FAN_STATUS_LOSPD (1 << 1) 143 #define FAN_STATUS_MONEN (1 << 0) 144 145 /* Dedicated function to read all registers related to a given fan input. 146 This saves us quite a few locks and bank selections. 147 Must be called with data->lock held. 148 nr is from 0 to 7 */ 149 static void pc87427_readall_fan(struct pc87427_data *data, u8 nr) 150 { 151 int iobase = data->address[LD_FAN]; 152 153 outb(BANK_FM(nr), iobase + PC87427_REG_BANK); 154 data->fan[nr] = inw(iobase + PC87427_REG_FAN); 155 data->fan_min[nr] = inw(iobase + PC87427_REG_FAN_MIN); 156 data->fan_status[nr] = inb(iobase + PC87427_REG_FAN_STATUS); 157 /* Clear fan alarm bits */ 158 outb(data->fan_status[nr], iobase + PC87427_REG_FAN_STATUS); 159 } 160 161 /* The 2 LSB of fan speed registers are used for something different. 162 The actual 2 LSB of the measurements are not available. */ 163 static inline unsigned long fan_from_reg(u16 reg) 164 { 165 reg &= 0xfffc; 166 if (reg == 0x0000 || reg == 0xfffc) 167 return 0; 168 return 5400000UL / reg; 169 } 170 171 /* The 2 LSB of the fan speed limit registers are not significant. */ 172 static inline u16 fan_to_reg(unsigned long val) 173 { 174 if (val < 83UL) 175 return 0xffff; 176 if (val >= 1350000UL) 177 return 0x0004; 178 return ((1350000UL + val / 2) / val) << 2; 179 } 180 181 /* 182 * Data interface 183 */ 184 185 static struct pc87427_data *pc87427_update_device(struct device *dev) 186 { 187 struct pc87427_data *data = dev_get_drvdata(dev); 188 int i; 189 190 mutex_lock(&data->lock); 191 if (!time_after(jiffies, data->last_updated + HZ) 192 && data->last_updated) 193 goto done; 194 195 /* Fans */ 196 for (i = 0; i < 8; i++) { 197 if (!(data->fan_enabled & (1 << i))) 198 continue; 199 pc87427_readall_fan(data, i); 200 } 201 data->last_updated = jiffies; 202 203 done: 204 mutex_unlock(&data->lock); 205 return data; 206 } 207 208 static ssize_t show_fan_input(struct device *dev, struct device_attribute 209 *devattr, char *buf) 210 { 211 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 212 struct pc87427_data *data = pc87427_update_device(dev); 213 int nr = attr->index; 214 215 return sprintf(buf, "%lu\n", fan_from_reg(data->fan[nr])); 216 } 217 218 static ssize_t show_fan_min(struct device *dev, struct device_attribute 219 *devattr, char *buf) 220 { 221 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 222 struct pc87427_data *data = pc87427_update_device(dev); 223 int nr = attr->index; 224 225 return sprintf(buf, "%lu\n", fan_from_reg(data->fan_min[nr])); 226 } 227 228 static ssize_t show_fan_alarm(struct device *dev, struct device_attribute 229 *devattr, char *buf) 230 { 231 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 232 struct pc87427_data *data = pc87427_update_device(dev); 233 int nr = attr->index; 234 235 return sprintf(buf, "%d\n", !!(data->fan_status[nr] 236 & FAN_STATUS_LOSPD)); 237 } 238 239 static ssize_t show_fan_fault(struct device *dev, struct device_attribute 240 *devattr, char *buf) 241 { 242 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 243 struct pc87427_data *data = pc87427_update_device(dev); 244 int nr = attr->index; 245 246 return sprintf(buf, "%d\n", !!(data->fan_status[nr] 247 & FAN_STATUS_STALL)); 248 } 249 250 static ssize_t set_fan_min(struct device *dev, struct device_attribute 251 *devattr, const char *buf, size_t count) 252 { 253 struct pc87427_data *data = dev_get_drvdata(dev); 254 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 255 int nr = attr->index; 256 unsigned long val = simple_strtoul(buf, NULL, 10); 257 int iobase = data->address[LD_FAN]; 258 259 mutex_lock(&data->lock); 260 outb(BANK_FM(nr), iobase + PC87427_REG_BANK); 261 /* The low speed limit registers are read-only while monitoring 262 is enabled, so we have to disable monitoring, then change the 263 limit, and finally enable monitoring again. */ 264 outb(0, iobase + PC87427_REG_FAN_STATUS); 265 data->fan_min[nr] = fan_to_reg(val); 266 outw(data->fan_min[nr], iobase + PC87427_REG_FAN_MIN); 267 outb(FAN_STATUS_MONEN, iobase + PC87427_REG_FAN_STATUS); 268 mutex_unlock(&data->lock); 269 270 return count; 271 } 272 273 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0); 274 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1); 275 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan_input, NULL, 2); 276 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan_input, NULL, 3); 277 static SENSOR_DEVICE_ATTR(fan5_input, S_IRUGO, show_fan_input, NULL, 4); 278 static SENSOR_DEVICE_ATTR(fan6_input, S_IRUGO, show_fan_input, NULL, 5); 279 static SENSOR_DEVICE_ATTR(fan7_input, S_IRUGO, show_fan_input, NULL, 6); 280 static SENSOR_DEVICE_ATTR(fan8_input, S_IRUGO, show_fan_input, NULL, 7); 281 282 static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, 283 show_fan_min, set_fan_min, 0); 284 static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, 285 show_fan_min, set_fan_min, 1); 286 static SENSOR_DEVICE_ATTR(fan3_min, S_IWUSR | S_IRUGO, 287 show_fan_min, set_fan_min, 2); 288 static SENSOR_DEVICE_ATTR(fan4_min, S_IWUSR | S_IRUGO, 289 show_fan_min, set_fan_min, 3); 290 static SENSOR_DEVICE_ATTR(fan5_min, S_IWUSR | S_IRUGO, 291 show_fan_min, set_fan_min, 4); 292 static SENSOR_DEVICE_ATTR(fan6_min, S_IWUSR | S_IRUGO, 293 show_fan_min, set_fan_min, 5); 294 static SENSOR_DEVICE_ATTR(fan7_min, S_IWUSR | S_IRUGO, 295 show_fan_min, set_fan_min, 6); 296 static SENSOR_DEVICE_ATTR(fan8_min, S_IWUSR | S_IRUGO, 297 show_fan_min, set_fan_min, 7); 298 299 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_fan_alarm, NULL, 0); 300 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_fan_alarm, NULL, 1); 301 static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_fan_alarm, NULL, 2); 302 static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_fan_alarm, NULL, 3); 303 static SENSOR_DEVICE_ATTR(fan5_alarm, S_IRUGO, show_fan_alarm, NULL, 4); 304 static SENSOR_DEVICE_ATTR(fan6_alarm, S_IRUGO, show_fan_alarm, NULL, 5); 305 static SENSOR_DEVICE_ATTR(fan7_alarm, S_IRUGO, show_fan_alarm, NULL, 6); 306 static SENSOR_DEVICE_ATTR(fan8_alarm, S_IRUGO, show_fan_alarm, NULL, 7); 307 308 static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL, 0); 309 static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_fan_fault, NULL, 1); 310 static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, show_fan_fault, NULL, 2); 311 static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, show_fan_fault, NULL, 3); 312 static SENSOR_DEVICE_ATTR(fan5_fault, S_IRUGO, show_fan_fault, NULL, 4); 313 static SENSOR_DEVICE_ATTR(fan6_fault, S_IRUGO, show_fan_fault, NULL, 5); 314 static SENSOR_DEVICE_ATTR(fan7_fault, S_IRUGO, show_fan_fault, NULL, 6); 315 static SENSOR_DEVICE_ATTR(fan8_fault, S_IRUGO, show_fan_fault, NULL, 7); 316 317 static struct attribute *pc87427_attributes_fan[8][5] = { 318 { 319 &sensor_dev_attr_fan1_input.dev_attr.attr, 320 &sensor_dev_attr_fan1_min.dev_attr.attr, 321 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 322 &sensor_dev_attr_fan1_fault.dev_attr.attr, 323 NULL 324 }, { 325 &sensor_dev_attr_fan2_input.dev_attr.attr, 326 &sensor_dev_attr_fan2_min.dev_attr.attr, 327 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 328 &sensor_dev_attr_fan2_fault.dev_attr.attr, 329 NULL 330 }, { 331 &sensor_dev_attr_fan3_input.dev_attr.attr, 332 &sensor_dev_attr_fan3_min.dev_attr.attr, 333 &sensor_dev_attr_fan3_alarm.dev_attr.attr, 334 &sensor_dev_attr_fan3_fault.dev_attr.attr, 335 NULL 336 }, { 337 &sensor_dev_attr_fan4_input.dev_attr.attr, 338 &sensor_dev_attr_fan4_min.dev_attr.attr, 339 &sensor_dev_attr_fan4_alarm.dev_attr.attr, 340 &sensor_dev_attr_fan4_fault.dev_attr.attr, 341 NULL 342 }, { 343 &sensor_dev_attr_fan5_input.dev_attr.attr, 344 &sensor_dev_attr_fan5_min.dev_attr.attr, 345 &sensor_dev_attr_fan5_alarm.dev_attr.attr, 346 &sensor_dev_attr_fan5_fault.dev_attr.attr, 347 NULL 348 }, { 349 &sensor_dev_attr_fan6_input.dev_attr.attr, 350 &sensor_dev_attr_fan6_min.dev_attr.attr, 351 &sensor_dev_attr_fan6_alarm.dev_attr.attr, 352 &sensor_dev_attr_fan6_fault.dev_attr.attr, 353 NULL 354 }, { 355 &sensor_dev_attr_fan7_input.dev_attr.attr, 356 &sensor_dev_attr_fan7_min.dev_attr.attr, 357 &sensor_dev_attr_fan7_alarm.dev_attr.attr, 358 &sensor_dev_attr_fan7_fault.dev_attr.attr, 359 NULL 360 }, { 361 &sensor_dev_attr_fan8_input.dev_attr.attr, 362 &sensor_dev_attr_fan8_min.dev_attr.attr, 363 &sensor_dev_attr_fan8_alarm.dev_attr.attr, 364 &sensor_dev_attr_fan8_fault.dev_attr.attr, 365 NULL 366 } 367 }; 368 369 static const struct attribute_group pc87427_group_fan[8] = { 370 { .attrs = pc87427_attributes_fan[0] }, 371 { .attrs = pc87427_attributes_fan[1] }, 372 { .attrs = pc87427_attributes_fan[2] }, 373 { .attrs = pc87427_attributes_fan[3] }, 374 { .attrs = pc87427_attributes_fan[4] }, 375 { .attrs = pc87427_attributes_fan[5] }, 376 { .attrs = pc87427_attributes_fan[6] }, 377 { .attrs = pc87427_attributes_fan[7] }, 378 }; 379 380 static ssize_t show_name(struct device *dev, struct device_attribute 381 *devattr, char *buf) 382 { 383 struct pc87427_data *data = dev_get_drvdata(dev); 384 385 return sprintf(buf, "%s\n", data->name); 386 } 387 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 388 389 390 /* 391 * Device detection, attach and detach 392 */ 393 394 static void __devinit pc87427_init_device(struct device *dev) 395 { 396 struct pc87427_data *data = dev_get_drvdata(dev); 397 int i; 398 u8 reg; 399 400 /* The FMC module should be ready */ 401 reg = pc87427_read8(data, LD_FAN, PC87427_REG_BANK); 402 if (!(reg & 0x80)) 403 dev_warn(dev, "FMC module not ready!\n"); 404 405 /* Check which fans are enabled */ 406 for (i = 0; i < 8; i++) { 407 reg = pc87427_read8_bank(data, LD_FAN, BANK_FM(i), 408 PC87427_REG_FAN_STATUS); 409 if (reg & FAN_STATUS_MONEN) 410 data->fan_enabled |= (1 << i); 411 } 412 413 if (!data->fan_enabled) { 414 dev_dbg(dev, "Enabling all fan inputs\n"); 415 for (i = 0; i < 8; i++) 416 pc87427_write8_bank(data, LD_FAN, BANK_FM(i), 417 PC87427_REG_FAN_STATUS, 418 FAN_STATUS_MONEN); 419 data->fan_enabled = 0xff; 420 } 421 } 422 423 static int __devinit pc87427_probe(struct platform_device *pdev) 424 { 425 struct pc87427_data *data; 426 struct resource *res; 427 int i, err; 428 429 if (!(data = kzalloc(sizeof(struct pc87427_data), GFP_KERNEL))) { 430 err = -ENOMEM; 431 printk(KERN_ERR DRVNAME ": Out of memory\n"); 432 goto exit; 433 } 434 435 /* This will need to be revisited when we add support for 436 temperature and voltage monitoring. */ 437 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 438 if (!request_region(res->start, resource_size(res), DRVNAME)) { 439 err = -EBUSY; 440 dev_err(&pdev->dev, "Failed to request region 0x%lx-0x%lx\n", 441 (unsigned long)res->start, (unsigned long)res->end); 442 goto exit_kfree; 443 } 444 data->address[0] = res->start; 445 446 mutex_init(&data->lock); 447 data->name = "pc87427"; 448 platform_set_drvdata(pdev, data); 449 pc87427_init_device(&pdev->dev); 450 451 /* Register sysfs hooks */ 452 if ((err = device_create_file(&pdev->dev, &dev_attr_name))) 453 goto exit_release_region; 454 for (i = 0; i < 8; i++) { 455 if (!(data->fan_enabled & (1 << i))) 456 continue; 457 if ((err = sysfs_create_group(&pdev->dev.kobj, 458 &pc87427_group_fan[i]))) 459 goto exit_remove_files; 460 } 461 462 data->hwmon_dev = hwmon_device_register(&pdev->dev); 463 if (IS_ERR(data->hwmon_dev)) { 464 err = PTR_ERR(data->hwmon_dev); 465 dev_err(&pdev->dev, "Class registration failed (%d)\n", err); 466 goto exit_remove_files; 467 } 468 469 return 0; 470 471 exit_remove_files: 472 for (i = 0; i < 8; i++) { 473 if (!(data->fan_enabled & (1 << i))) 474 continue; 475 sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_fan[i]); 476 } 477 exit_release_region: 478 release_region(res->start, resource_size(res)); 479 exit_kfree: 480 platform_set_drvdata(pdev, NULL); 481 kfree(data); 482 exit: 483 return err; 484 } 485 486 static int __devexit pc87427_remove(struct platform_device *pdev) 487 { 488 struct pc87427_data *data = platform_get_drvdata(pdev); 489 struct resource *res; 490 int i; 491 492 hwmon_device_unregister(data->hwmon_dev); 493 device_remove_file(&pdev->dev, &dev_attr_name); 494 for (i = 0; i < 8; i++) { 495 if (!(data->fan_enabled & (1 << i))) 496 continue; 497 sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_fan[i]); 498 } 499 platform_set_drvdata(pdev, NULL); 500 kfree(data); 501 502 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 503 release_region(res->start, resource_size(res)); 504 505 return 0; 506 } 507 508 509 static struct platform_driver pc87427_driver = { 510 .driver = { 511 .owner = THIS_MODULE, 512 .name = DRVNAME, 513 }, 514 .probe = pc87427_probe, 515 .remove = __devexit_p(pc87427_remove), 516 }; 517 518 static int __init pc87427_device_add(unsigned short address) 519 { 520 struct resource res = { 521 .start = address, 522 .end = address + REGION_LENGTH - 1, 523 .name = logdev_str[0], 524 .flags = IORESOURCE_IO, 525 }; 526 int err; 527 528 err = acpi_check_resource_conflict(&res); 529 if (err) 530 goto exit; 531 532 pdev = platform_device_alloc(DRVNAME, address); 533 if (!pdev) { 534 err = -ENOMEM; 535 printk(KERN_ERR DRVNAME ": Device allocation failed\n"); 536 goto exit; 537 } 538 539 err = platform_device_add_resources(pdev, &res, 1); 540 if (err) { 541 printk(KERN_ERR DRVNAME ": Device resource addition failed " 542 "(%d)\n", err); 543 goto exit_device_put; 544 } 545 546 err = platform_device_add(pdev); 547 if (err) { 548 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n", 549 err); 550 goto exit_device_put; 551 } 552 553 return 0; 554 555 exit_device_put: 556 platform_device_put(pdev); 557 exit: 558 return err; 559 } 560 561 static int __init pc87427_find(int sioaddr, unsigned short *address) 562 { 563 u16 val; 564 int i, err = 0; 565 566 /* Identify device */ 567 val = force_id ? force_id : superio_inb(sioaddr, SIOREG_DEVID); 568 if (val != 0xf2) { /* PC87427 */ 569 err = -ENODEV; 570 goto exit; 571 } 572 573 for (i = 0; i < 2; i++) { 574 address[i] = 0; 575 /* Select logical device */ 576 superio_outb(sioaddr, SIOREG_LDSEL, logdev[i]); 577 578 val = superio_inb(sioaddr, SIOREG_ACT); 579 if (!(val & 0x01)) { 580 printk(KERN_INFO DRVNAME ": Logical device 0x%02x " 581 "not activated\n", logdev[i]); 582 continue; 583 } 584 585 val = superio_inb(sioaddr, SIOREG_MAP); 586 if (val & 0x01) { 587 printk(KERN_WARNING DRVNAME ": Logical device 0x%02x " 588 "is memory-mapped, can't use\n", logdev[i]); 589 continue; 590 } 591 592 val = (superio_inb(sioaddr, SIOREG_IOBASE) << 8) 593 | superio_inb(sioaddr, SIOREG_IOBASE + 1); 594 if (!val) { 595 printk(KERN_INFO DRVNAME ": I/O base address not set " 596 "for logical device 0x%02x\n", logdev[i]); 597 continue; 598 } 599 address[i] = val; 600 } 601 602 exit: 603 superio_exit(sioaddr); 604 return err; 605 } 606 607 static int __init pc87427_init(void) 608 { 609 int err; 610 unsigned short address[2]; 611 612 if (pc87427_find(0x2e, address) 613 && pc87427_find(0x4e, address)) 614 return -ENODEV; 615 616 /* For now the driver only handles fans so we only care about the 617 first address. */ 618 if (!address[0]) 619 return -ENODEV; 620 621 err = platform_driver_register(&pc87427_driver); 622 if (err) 623 goto exit; 624 625 /* Sets global pdev as a side effect */ 626 err = pc87427_device_add(address[0]); 627 if (err) 628 goto exit_driver; 629 630 return 0; 631 632 exit_driver: 633 platform_driver_unregister(&pc87427_driver); 634 exit: 635 return err; 636 } 637 638 static void __exit pc87427_exit(void) 639 { 640 platform_device_unregister(pdev); 641 platform_driver_unregister(&pc87427_driver); 642 } 643 644 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); 645 MODULE_DESCRIPTION("PC87427 hardware monitoring driver"); 646 MODULE_LICENSE("GPL"); 647 648 module_init(pc87427_init); 649 module_exit(pc87427_exit); 650