drivers/hwmon/pc87427.c

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