drivers/hwmon/smsc47m1.c

   1 /*
   2     smsc47m1.c - Part of lm_sensors, Linux kernel modules
   3                  for hardware monitoring
   4
   5     Supports the SMSC LPC47B27x, LPC47M10x, LPC47M13x, LPC47M14x,
   6     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 */
  42 static 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
  49 static inline void
  50 superio_outb(int reg, int val)
  51 {
  52         outb(reg, REG);
  53         outb(val, VAL);
  54 }
  55
  56 static inline int
  57 superio_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
  66 static inline void
  67 superio_enter(void)
  68 {
  69         outb(0x55, REG);
  70 }
  71
  72 static inline void
  73 superio_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
 104 struct 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
 120 static int smsc47m1_detect(struct i2c_adapter *adapter);
 121 static int smsc47m1_detach_client(struct i2c_client *client);
 122
 123 static int smsc47m1_read_value(struct i2c_client *client, u8 reg);
 124 static void smsc47m1_write_value(struct i2c_client *client, u8 reg, u8 value);
 125
 126 static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
 127                 int init);
 128
 129
 130 static 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
 141 static 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
 155 static 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
 163 static 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
 169 static 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
 175 static 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
 181 static 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
 187 static 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. */
 214 static 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
 252 static 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
 273 static 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)                                             \
 295 static ssize_t get_fan##offset (struct device *dev, struct device_attribute *attr, char *buf)           \
 296 {                                                                       \
 297         return get_fan(dev, buf, offset - 1);                           \
 298 }                                                                       \
 299 static 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 }                                                                       \
 303 static 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 }                                                                       \
 308 static 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 }                                                                       \
 312 static 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 }                                                                       \
 317 static ssize_t get_pwm##offset (struct device *dev, struct device_attribute *attr, char *buf)           \
 318 {                                                                       \
 319         return get_pwm(dev, buf, offset - 1);                           \
 320 }                                                                       \
 321 static 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 }                                                                       \
 326 static 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 }                                                                       \
 330 static 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 }                                                                       \
 335 static DEVICE_ATTR(fan##offset##_input, S_IRUGO, get_fan##offset,       \
 336                 NULL);                                                  \
 337 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,                \
 338                 get_fan##offset##_min, set_fan##offset##_min);          \
 339 static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR,                \
 340                 get_fan##offset##_div, set_fan##offset##_div);          \
 341 static DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR,                      \
 342                 get_pwm##offset, set_pwm##offset);                      \
 343 static DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR,             \
 344                 get_pwm##offset##_en, set_pwm##offset##_en);
 345
 346 fan_present(1);
 347 fan_present(2);
 348
 349 static 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. */
 354 static 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
 371 static const struct attribute_group smsc47m1_group = {
 372         .attrs = smsc47m1_attributes,
 373 };
 374
 375 static 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/LPC47M13x (device id 0x59), LPC47M14x (device id
 384          * 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 LPC47M10x/LPC47M13x\n");
 394         else if (val == 0x5F)
 395                 printk(KERN_INFO "smsc47m1: Found SMSC LPC47M14x\n");
 396         else if (val == 0x60)
 397                 printk(KERN_INFO "smsc47m1: Found SMSC "
 398                        "LPC47M15x/LPC47M192/LPC47M997\n");
 399         else {
 400                 superio_exit();
 401                 return -ENODEV;
 402         }
 403
 404         superio_select();
 405         *addr = (superio_inb(SUPERIO_REG_BASE) << 8)
 406               |  superio_inb(SUPERIO_REG_BASE + 1);
 407         val = superio_inb(SUPERIO_REG_ACT);
 408         if (*addr == 0 || (val & 0x01) == 0) {
 409                 printk(KERN_INFO "smsc47m1: Device is disabled, will not use\n");
 410                 superio_exit();
 411                 return -ENODEV;
 412         }
 413
 414         superio_exit();
 415         return 0;
 416 }
 417
 418 static int smsc47m1_detect(struct i2c_adapter *adapter)
 419 {
 420         struct i2c_client *new_client;
 421         struct smsc47m1_data *data;
 422         int err = 0;
 423         int fan1, fan2, pwm1, pwm2;
 424
 425         if (!request_region(address, SMSC_EXTENT, smsc47m1_driver.driver.name)) {
 426                 dev_err(&adapter->dev, "Region 0x%x already in use!\n", address);
 427                 return -EBUSY;
 428         }
 429
 430         if (!(data = kzalloc(sizeof(struct smsc47m1_data), GFP_KERNEL))) {
 431                 err = -ENOMEM;
 432                 goto error_release;
 433         }
 434
 435         new_client = &data->client;
 436         i2c_set_clientdata(new_client, data);
 437         new_client->addr = address;
 438         mutex_init(&data->lock);
 439         new_client->adapter = adapter;
 440         new_client->driver = &smsc47m1_driver;
 441         new_client->flags = 0;
 442
 443         strlcpy(new_client->name, "smsc47m1", I2C_NAME_SIZE);
 444         mutex_init(&data->update_lock);
 445
 446         /* If no function is properly configured, there's no point in
 447            actually registering the chip. */
 448         fan1 = (smsc47m1_read_value(new_client, SMSC47M1_REG_TPIN(0)) & 0x05)
 449                == 0x05;
 450         fan2 = (smsc47m1_read_value(new_client, SMSC47M1_REG_TPIN(1)) & 0x05)
 451                == 0x05;
 452         pwm1 = (smsc47m1_read_value(new_client, SMSC47M1_REG_PPIN(0)) & 0x05)
 453                == 0x04;
 454         pwm2 = (smsc47m1_read_value(new_client, SMSC47M1_REG_PPIN(1)) & 0x05)
 455                == 0x04;
 456         if (!(fan1 || fan2 || pwm1 || pwm2)) {
 457                 dev_warn(&adapter->dev, "Device at 0x%x is not configured, "
 458                          "will not use\n", new_client->addr);
 459                 err = -ENODEV;
 460                 goto error_free;
 461         }
 462
 463         if ((err = i2c_attach_client(new_client)))
 464                 goto error_free;
 465
 466         /* Some values (fan min, clock dividers, pwm registers) may be
 467            needed before any update is triggered, so we better read them
 468            at least once here. We don't usually do it that way, but in
 469            this particular case, manually reading 5 registers out of 8
 470            doesn't make much sense and we're better using the existing
 471            function. */
 472         smsc47m1_update_device(&new_client->dev, 1);
 473
 474         /* Register sysfs hooks */
 475         if (fan1) {
 476                 if ((err = device_create_file(&new_client->dev,
 477                                               &dev_attr_fan1_input))
 478                  || (err = device_create_file(&new_client->dev,
 479                                               &dev_attr_fan1_min))
 480                  || (err = device_create_file(&new_client->dev,
 481                                               &dev_attr_fan1_div)))
 482                         goto error_remove_files;
 483         } else
 484                 dev_dbg(&new_client->dev, "Fan 1 not enabled by hardware, "
 485                         "skipping\n");
 486
 487         if (fan2) {
 488                 if ((err = device_create_file(&new_client->dev,
 489                                               &dev_attr_fan2_input))
 490                  || (err = device_create_file(&new_client->dev,
 491                                               &dev_attr_fan2_min))
 492                  || (err = device_create_file(&new_client->dev,
 493                                               &dev_attr_fan2_div)))
 494                         goto error_remove_files;
 495         } else
 496                 dev_dbg(&new_client->dev, "Fan 2 not enabled by hardware, "
 497                         "skipping\n");
 498
 499         if (pwm1) {
 500                 if ((err = device_create_file(&new_client->dev,
 501                                               &dev_attr_pwm1))
 502                  || (err = device_create_file(&new_client->dev,
 503                                               &dev_attr_pwm1_enable)))
 504                         goto error_remove_files;
 505         } else
 506                 dev_dbg(&new_client->dev, "PWM 1 not enabled by hardware, "
 507                         "skipping\n");
 508         if (pwm2) {
 509                 if ((err = device_create_file(&new_client->dev,
 510                                               &dev_attr_pwm2))
 511                  || (err = device_create_file(&new_client->dev,
 512                                               &dev_attr_pwm2_enable)))
 513                         goto error_remove_files;
 514         } else
 515                 dev_dbg(&new_client->dev, "PWM 2 not enabled by hardware, "
 516                         "skipping\n");
 517
 518         if ((err = device_create_file(&new_client->dev, &dev_attr_alarms)))
 519                 goto error_remove_files;
 520
 521         data->class_dev = hwmon_device_register(&new_client->dev);
 522         if (IS_ERR(data->class_dev)) {
 523                 err = PTR_ERR(data->class_dev);
 524                 goto error_remove_files;
 525         }
 526
 527         return 0;
 528
 529 error_remove_files:
 530         sysfs_remove_group(&new_client->dev.kobj, &smsc47m1_group);
 531         i2c_detach_client(new_client);
 532 error_free:
 533         kfree(data);
 534 error_release:
 535         release_region(address, SMSC_EXTENT);
 536         return err;
 537 }
 538
 539 static int smsc47m1_detach_client(struct i2c_client *client)
 540 {
 541         struct smsc47m1_data *data = i2c_get_clientdata(client);
 542         int err;
 543
 544         hwmon_device_unregister(data->class_dev);
 545         sysfs_remove_group(&client->dev.kobj, &smsc47m1_group);
 546
 547         if ((err = i2c_detach_client(client)))
 548                 return err;
 549
 550         release_region(client->addr, SMSC_EXTENT);
 551         kfree(data);
 552
 553         return 0;
 554 }
 555
 556 static int smsc47m1_read_value(struct i2c_client *client, u8 reg)
 557 {
 558         int res;
 559
 560         mutex_lock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);
 561         res = inb_p(client->addr + reg);
 562         mutex_unlock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);
 563         return res;
 564 }
 565
 566 static void smsc47m1_write_value(struct i2c_client *client, u8 reg, u8 value)
 567 {
 568         mutex_lock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);
 569         outb_p(value, client->addr + reg);
 570         mutex_unlock(&((struct smsc47m1_data *) i2c_get_clientdata(client))->lock);
 571 }
 572
 573 static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
 574                 int init)
 575 {
 576         struct i2c_client *client = to_i2c_client(dev);
 577         struct smsc47m1_data *data = i2c_get_clientdata(client);
 578
 579         mutex_lock(&data->update_lock);
 580
 581         if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || init) {
 582                 int i;
 583
 584                 for (i = 0; i < 2; i++) {
 585                         data->fan[i] = smsc47m1_read_value(client,
 586                                        SMSC47M1_REG_FAN(i));
 587                         data->fan_preload[i] = smsc47m1_read_value(client,
 588                                                SMSC47M1_REG_FAN_PRELOAD(i));
 589                         data->pwm[i] = smsc47m1_read_value(client,
 590                                        SMSC47M1_REG_PWM(i));
 591                 }
 592
 593                 i = smsc47m1_read_value(client, SMSC47M1_REG_FANDIV);
 594                 data->fan_div[0] = (i >> 4) & 0x03;
 595                 data->fan_div[1] = i >> 6;
 596
 597                 data->alarms = smsc47m1_read_value(client,
 598                                SMSC47M1_REG_ALARM) >> 6;
 599                 /* Clear alarms if needed */
 600                 if (data->alarms)
 601                         smsc47m1_write_value(client, SMSC47M1_REG_ALARM, 0xC0);
 602
 603                 data->last_updated = jiffies;
 604         }
 605
 606         mutex_unlock(&data->update_lock);
 607         return data;
 608 }
 609
 610 static int __init sm_smsc47m1_init(void)
 611 {
 612         if (smsc47m1_find(&address)) {
 613                 return -ENODEV;
 614         }
 615
 616         return i2c_isa_add_driver(&smsc47m1_driver);
 617 }
 618
 619 static void __exit sm_smsc47m1_exit(void)
 620 {
 621         i2c_isa_del_driver(&smsc47m1_driver);
 622 }
 623
 624 MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
 625 MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver");
 626 MODULE_LICENSE("GPL");
 627
 628 module_init(sm_smsc47m1_init);
 629 module_exit(sm_smsc47m1_exit);