drivers/hwmon/lm80.c

   1 /*
   2  * lm80.c - From lm_sensors, Linux kernel modules for hardware
   3  * monitoring
   4  * Copyright (C) 1998, 1999  Frodo Looijaard <frodol@dds.nl>
   5  * and Philip Edelbrock <phil@netroedge.com>
   6  *
   7  * Ported to Linux 2.6 by Tiago Sousa <mirage@kaotik.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  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/i2c.h>
  29 #include <linux/hwmon.h>
  30 #include <linux/err.h>
  31 #include <linux/mutex.h>
  32
  33 /* Addresses to scan */
  34 static unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c,
  35                                         0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
  36
  37 /* Insmod parameters */
  38 I2C_CLIENT_INSMOD_1(lm80);
  39
  40 /* Many LM80 constants specified below */
  41
  42 /* The LM80 registers */
  43 #define LM80_REG_IN_MAX(nr)             (0x2a + (nr) * 2)
  44 #define LM80_REG_IN_MIN(nr)             (0x2b + (nr) * 2)
  45 #define LM80_REG_IN(nr)                 (0x20 + (nr))
  46
  47 #define LM80_REG_FAN1                   0x28
  48 #define LM80_REG_FAN2                   0x29
  49 #define LM80_REG_FAN_MIN(nr)            (0x3b + (nr))
  50
  51 #define LM80_REG_TEMP                   0x27
  52 #define LM80_REG_TEMP_HOT_MAX           0x38
  53 #define LM80_REG_TEMP_HOT_HYST          0x39
  54 #define LM80_REG_TEMP_OS_MAX            0x3a
  55 #define LM80_REG_TEMP_OS_HYST           0x3b
  56
  57 #define LM80_REG_CONFIG                 0x00
  58 #define LM80_REG_ALARM1                 0x01
  59 #define LM80_REG_ALARM2                 0x02
  60 #define LM80_REG_MASK1                  0x03
  61 #define LM80_REG_MASK2                  0x04
  62 #define LM80_REG_FANDIV                 0x05
  63 #define LM80_REG_RES                    0x06
  64
  65
  66 /* Conversions. Rounding and limit checking is only done on the TO_REG
  67    variants. Note that you should be a bit careful with which arguments
  68    these macros are called: arguments may be evaluated more than once.
  69    Fixing this is just not worth it. */
  70
  71 #define IN_TO_REG(val)          (SENSORS_LIMIT(((val)+5)/10,0,255))
  72 #define IN_FROM_REG(val)        ((val)*10)
  73
  74 static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
  75 {
  76         if (rpm == 0)
  77                 return 255;
  78         rpm = SENSORS_LIMIT(rpm, 1, 1000000);
  79         return SENSORS_LIMIT((1350000 + rpm*div / 2) / (rpm*div), 1, 254);
  80 }
  81
  82 #define FAN_FROM_REG(val,div)   ((val)==0?-1:\
  83                                 (val)==255?0:1350000/((div)*(val)))
  84
  85 static inline long TEMP_FROM_REG(u16 temp)
  86 {
  87         long res;
  88
  89         temp >>= 4;
  90         if (temp < 0x0800)
  91                 res = 625 * (long) temp;
  92         else
  93                 res = ((long) temp - 0x01000) * 625;
  94
  95         return res / 10;
  96 }
  97
  98 #define TEMP_LIMIT_FROM_REG(val)        (((val)>0x80?(val)-0x100:(val))*1000)
  99
 100 #define TEMP_LIMIT_TO_REG(val)          SENSORS_LIMIT((val)<0?\
 101                                         ((val)-500)/1000:((val)+500)/1000,0,255)
 102
 103 #define DIV_FROM_REG(val)               (1 << (val))
 104
 105 /*
 106  * Client data (each client gets its own)
 107  */
 108
 109 struct lm80_data {
 110         struct i2c_client client;
 111         struct device *hwmon_dev;
 112         struct mutex update_lock;
 113         char valid;             /* !=0 if following fields are valid */
 114         unsigned long last_updated;     /* In jiffies */
 115
 116         u8 in[7];               /* Register value */
 117         u8 in_max[7];           /* Register value */
 118         u8 in_min[7];           /* Register value */
 119         u8 fan[2];              /* Register value */
 120         u8 fan_min[2];          /* Register value */
 121         u8 fan_div[2];          /* Register encoding, shifted right */
 122         u16 temp;               /* Register values, shifted right */
 123         u8 temp_hot_max;        /* Register value */
 124         u8 temp_hot_hyst;       /* Register value */
 125         u8 temp_os_max;         /* Register value */
 126         u8 temp_os_hyst;        /* Register value */
 127         u16 alarms;             /* Register encoding, combined */
 128 };
 129
 130 /*
 131  * Functions declaration
 132  */
 133
 134 static int lm80_attach_adapter(struct i2c_adapter *adapter);
 135 static int lm80_detect(struct i2c_adapter *adapter, int address, int kind);
 136 static void lm80_init_client(struct i2c_client *client);
 137 static int lm80_detach_client(struct i2c_client *client);
 138 static struct lm80_data *lm80_update_device(struct device *dev);
 139 static int lm80_read_value(struct i2c_client *client, u8 reg);
 140 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
 141
 142 /*
 143  * Driver data (common to all clients)
 144  */
 145
 146 static struct i2c_driver lm80_driver = {
 147         .driver = {
 148                 .name   = "lm80",
 149         },
 150         .id             = I2C_DRIVERID_LM80,
 151         .attach_adapter = lm80_attach_adapter,
 152         .detach_client  = lm80_detach_client,
 153 };
 154
 155 /*
 156  * Sysfs stuff
 157  */
 158
 159 #define show_in(suffix, value) \
 160 static ssize_t show_in_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
 161 { \
 162         struct lm80_data *data = lm80_update_device(dev); \
 163         return sprintf(buf, "%d\n", IN_FROM_REG(data->value)); \
 164 }
 165 show_in(min0, in_min[0]);
 166 show_in(min1, in_min[1]);
 167 show_in(min2, in_min[2]);
 168 show_in(min3, in_min[3]);
 169 show_in(min4, in_min[4]);
 170 show_in(min5, in_min[5]);
 171 show_in(min6, in_min[6]);
 172 show_in(max0, in_max[0]);
 173 show_in(max1, in_max[1]);
 174 show_in(max2, in_max[2]);
 175 show_in(max3, in_max[3]);
 176 show_in(max4, in_max[4]);
 177 show_in(max5, in_max[5]);
 178 show_in(max6, in_max[6]);
 179 show_in(input0, in[0]);
 180 show_in(input1, in[1]);
 181 show_in(input2, in[2]);
 182 show_in(input3, in[3]);
 183 show_in(input4, in[4]);
 184 show_in(input5, in[5]);
 185 show_in(input6, in[6]);
 186
 187 #define set_in(suffix, value, reg) \
 188 static ssize_t set_in_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
 189         size_t count) \
 190 { \
 191         struct i2c_client *client = to_i2c_client(dev); \
 192         struct lm80_data *data = i2c_get_clientdata(client); \
 193         long val = simple_strtol(buf, NULL, 10); \
 194  \
 195         mutex_lock(&data->update_lock);\
 196         data->value = IN_TO_REG(val); \
 197         lm80_write_value(client, reg, data->value); \
 198         mutex_unlock(&data->update_lock);\
 199         return count; \
 200 }
 201 set_in(min0, in_min[0], LM80_REG_IN_MIN(0));
 202 set_in(min1, in_min[1], LM80_REG_IN_MIN(1));
 203 set_in(min2, in_min[2], LM80_REG_IN_MIN(2));
 204 set_in(min3, in_min[3], LM80_REG_IN_MIN(3));
 205 set_in(min4, in_min[4], LM80_REG_IN_MIN(4));
 206 set_in(min5, in_min[5], LM80_REG_IN_MIN(5));
 207 set_in(min6, in_min[6], LM80_REG_IN_MIN(6));
 208 set_in(max0, in_max[0], LM80_REG_IN_MAX(0));
 209 set_in(max1, in_max[1], LM80_REG_IN_MAX(1));
 210 set_in(max2, in_max[2], LM80_REG_IN_MAX(2));
 211 set_in(max3, in_max[3], LM80_REG_IN_MAX(3));
 212 set_in(max4, in_max[4], LM80_REG_IN_MAX(4));
 213 set_in(max5, in_max[5], LM80_REG_IN_MAX(5));
 214 set_in(max6, in_max[6], LM80_REG_IN_MAX(6));
 215
 216 #define show_fan(suffix, value, div) \
 217 static ssize_t show_fan_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
 218 { \
 219         struct lm80_data *data = lm80_update_device(dev); \
 220         return sprintf(buf, "%d\n", FAN_FROM_REG(data->value, \
 221                        DIV_FROM_REG(data->div))); \
 222 }
 223 show_fan(min1, fan_min[0], fan_div[0]);
 224 show_fan(min2, fan_min[1], fan_div[1]);
 225 show_fan(input1, fan[0], fan_div[0]);
 226 show_fan(input2, fan[1], fan_div[1]);
 227
 228 #define show_fan_div(suffix, value) \
 229 static ssize_t show_fan_div##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
 230 { \
 231         struct lm80_data *data = lm80_update_device(dev); \
 232         return sprintf(buf, "%d\n", DIV_FROM_REG(data->value)); \
 233 }
 234 show_fan_div(1, fan_div[0]);
 235 show_fan_div(2, fan_div[1]);
 236
 237 #define set_fan(suffix, value, reg, div) \
 238 static ssize_t set_fan_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
 239         size_t count) \
 240 { \
 241         struct i2c_client *client = to_i2c_client(dev); \
 242         struct lm80_data *data = i2c_get_clientdata(client); \
 243         long val = simple_strtoul(buf, NULL, 10); \
 244  \
 245         mutex_lock(&data->update_lock);\
 246         data->value = FAN_TO_REG(val, DIV_FROM_REG(data->div)); \
 247         lm80_write_value(client, reg, data->value); \
 248         mutex_unlock(&data->update_lock);\
 249         return count; \
 250 }
 251 set_fan(min1, fan_min[0], LM80_REG_FAN_MIN(1), fan_div[0]);
 252 set_fan(min2, fan_min[1], LM80_REG_FAN_MIN(2), fan_div[1]);
 253
 254 /* Note: we save and restore the fan minimum here, because its value is
 255    determined in part by the fan divisor.  This follows the principle of
 256    least surprise; the user doesn't expect the fan minimum to change just
 257    because the divisor changed. */
 258 static ssize_t set_fan_div(struct device *dev, const char *buf,
 259         size_t count, int nr)
 260 {
 261         struct i2c_client *client = to_i2c_client(dev);
 262         struct lm80_data *data = i2c_get_clientdata(client);
 263         unsigned long min, val = simple_strtoul(buf, NULL, 10);
 264         u8 reg;
 265
 266         /* Save fan_min */
 267         mutex_lock(&data->update_lock);
 268         min = FAN_FROM_REG(data->fan_min[nr],
 269                            DIV_FROM_REG(data->fan_div[nr]));
 270
 271         switch (val) {
 272         case 1: data->fan_div[nr] = 0; break;
 273         case 2: data->fan_div[nr] = 1; break;
 274         case 4: data->fan_div[nr] = 2; break;
 275         case 8: data->fan_div[nr] = 3; break;
 276         default:
 277                 dev_err(&client->dev, "fan_div value %ld not "
 278                         "supported. Choose one of 1, 2, 4 or 8!\n", val);
 279                 mutex_unlock(&data->update_lock);
 280                 return -EINVAL;
 281         }
 282
 283         reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1))))
 284             | (data->fan_div[nr] << (2 * (nr + 1)));
 285         lm80_write_value(client, LM80_REG_FANDIV, reg);
 286
 287         /* Restore fan_min */
 288         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 289         lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
 290         mutex_unlock(&data->update_lock);
 291
 292         return count;
 293 }
 294
 295 #define set_fan_div(number) \
 296 static ssize_t set_fan_div##number(struct device *dev, struct device_attribute *attr, const char *buf, \
 297         size_t count) \
 298 { \
 299         return set_fan_div(dev, buf, count, number - 1); \
 300 }
 301 set_fan_div(1);
 302 set_fan_div(2);
 303
 304 static ssize_t show_temp_input1(struct device *dev, struct device_attribute *attr, char *buf)
 305 {
 306         struct lm80_data *data = lm80_update_device(dev);
 307         return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp));
 308 }
 309
 310 #define show_temp(suffix, value) \
 311 static ssize_t show_temp_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
 312 { \
 313         struct lm80_data *data = lm80_update_device(dev); \
 314         return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
 315 }
 316 show_temp(hot_max, temp_hot_max);
 317 show_temp(hot_hyst, temp_hot_hyst);
 318 show_temp(os_max, temp_os_max);
 319 show_temp(os_hyst, temp_os_hyst);
 320
 321 #define set_temp(suffix, value, reg) \
 322 static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
 323         size_t count) \
 324 { \
 325         struct i2c_client *client = to_i2c_client(dev); \
 326         struct lm80_data *data = i2c_get_clientdata(client); \
 327         long val = simple_strtoul(buf, NULL, 10); \
 328  \
 329         mutex_lock(&data->update_lock); \
 330         data->value = TEMP_LIMIT_TO_REG(val); \
 331         lm80_write_value(client, reg, data->value); \
 332         mutex_unlock(&data->update_lock); \
 333         return count; \
 334 }
 335 set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX);
 336 set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST);
 337 set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX);
 338 set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST);
 339
 340 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 341 {
 342         struct lm80_data *data = lm80_update_device(dev);
 343         return sprintf(buf, "%u\n", data->alarms);
 344 }
 345
 346 static DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min0, set_in_min0);
 347 static DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min1, set_in_min1);
 348 static DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min2, set_in_min2);
 349 static DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO, show_in_min3, set_in_min3);
 350 static DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO, show_in_min4, set_in_min4);
 351 static DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO, show_in_min5, set_in_min5);
 352 static DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO, show_in_min6, set_in_min6);
 353 static DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max0, set_in_max0);
 354 static DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max1, set_in_max1);
 355 static DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max2, set_in_max2);
 356 static DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO, show_in_max3, set_in_max3);
 357 static DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO, show_in_max4, set_in_max4);
 358 static DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO, show_in_max5, set_in_max5);
 359 static DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO, show_in_max6, set_in_max6);
 360 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
 361 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
 362 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
 363 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
 364 static DEVICE_ATTR(in4_input, S_IRUGO, show_in_input4, NULL);
 365 static DEVICE_ATTR(in5_input, S_IRUGO, show_in_input5, NULL);
 366 static DEVICE_ATTR(in6_input, S_IRUGO, show_in_input6, NULL);
 367 static DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min1,
 368     set_fan_min1);
 369 static DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min2,
 370     set_fan_min2);
 371 static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input1, NULL);
 372 static DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input2, NULL);
 373 static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div1, set_fan_div1);
 374 static DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div2, set_fan_div2);
 375 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
 376 static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max,
 377     set_temp_hot_max);
 378 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst,
 379     set_temp_hot_hyst);
 380 static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max,
 381     set_temp_os_max);
 382 static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst,
 383     set_temp_os_hyst);
 384 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 385
 386 /*
 387  * Real code
 388  */
 389
 390 static int lm80_attach_adapter(struct i2c_adapter *adapter)
 391 {
 392         if (!(adapter->class & I2C_CLASS_HWMON))
 393                 return 0;
 394         return i2c_probe(adapter, &addr_data, lm80_detect);
 395 }
 396
 397 static struct attribute *lm80_attributes[] = {
 398         &dev_attr_in0_min.attr,
 399         &dev_attr_in1_min.attr,
 400         &dev_attr_in2_min.attr,
 401         &dev_attr_in3_min.attr,
 402         &dev_attr_in4_min.attr,
 403         &dev_attr_in5_min.attr,
 404         &dev_attr_in6_min.attr,
 405         &dev_attr_in0_max.attr,
 406         &dev_attr_in1_max.attr,
 407         &dev_attr_in2_max.attr,
 408         &dev_attr_in3_max.attr,
 409         &dev_attr_in4_max.attr,
 410         &dev_attr_in5_max.attr,
 411         &dev_attr_in6_max.attr,
 412         &dev_attr_in0_input.attr,
 413         &dev_attr_in1_input.attr,
 414         &dev_attr_in2_input.attr,
 415         &dev_attr_in3_input.attr,
 416         &dev_attr_in4_input.attr,
 417         &dev_attr_in5_input.attr,
 418         &dev_attr_in6_input.attr,
 419         &dev_attr_fan1_min.attr,
 420         &dev_attr_fan2_min.attr,
 421         &dev_attr_fan1_input.attr,
 422         &dev_attr_fan2_input.attr,
 423         &dev_attr_fan1_div.attr,
 424         &dev_attr_fan2_div.attr,
 425         &dev_attr_temp1_input.attr,
 426         &dev_attr_temp1_max.attr,
 427         &dev_attr_temp1_max_hyst.attr,
 428         &dev_attr_temp1_crit.attr,
 429         &dev_attr_temp1_crit_hyst.attr,
 430         &dev_attr_alarms.attr,
 431
 432         NULL
 433 };
 434
 435 static const struct attribute_group lm80_group = {
 436         .attrs = lm80_attributes,
 437 };
 438
 439 static int lm80_detect(struct i2c_adapter *adapter, int address, int kind)
 440 {
 441         int i, cur;
 442         struct i2c_client *new_client;
 443         struct lm80_data *data;
 444         int err = 0;
 445         const char *name;
 446
 447         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 448                 goto exit;
 449
 450         /* OK. For now, we presume we have a valid client. We now create the
 451            client structure, even though we cannot fill it completely yet.
 452            But it allows us to access lm80_{read,write}_value. */
 453         if (!(data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL))) {
 454                 err = -ENOMEM;
 455                 goto exit;
 456         }
 457
 458         new_client = &data->client;
 459         i2c_set_clientdata(new_client, data);
 460         new_client->addr = address;
 461         new_client->adapter = adapter;
 462         new_client->driver = &lm80_driver;
 463         new_client->flags = 0;
 464
 465         /* Now, we do the remaining detection. It is lousy. */
 466         if (lm80_read_value(new_client, LM80_REG_ALARM2) & 0xc0)
 467                 goto error_free;
 468         for (i = 0x2a; i <= 0x3d; i++) {
 469                 cur = i2c_smbus_read_byte_data(new_client, i);
 470                 if ((i2c_smbus_read_byte_data(new_client, i + 0x40) != cur)
 471                  || (i2c_smbus_read_byte_data(new_client, i + 0x80) != cur)
 472                  || (i2c_smbus_read_byte_data(new_client, i + 0xc0) != cur))
 473                     goto error_free;
 474         }
 475
 476         /* Determine the chip type - only one kind supported! */
 477         kind = lm80;
 478         name = "lm80";
 479
 480         /* Fill in the remaining client fields and put it into the global list */
 481         strlcpy(new_client->name, name, I2C_NAME_SIZE);
 482         data->valid = 0;
 483         mutex_init(&data->update_lock);
 484
 485         /* Tell the I2C layer a new client has arrived */
 486         if ((err = i2c_attach_client(new_client)))
 487                 goto error_free;
 488
 489         /* Initialize the LM80 chip */
 490         lm80_init_client(new_client);
 491
 492         /* A few vars need to be filled upon startup */
 493         data->fan_min[0] = lm80_read_value(new_client, LM80_REG_FAN_MIN(1));
 494         data->fan_min[1] = lm80_read_value(new_client, LM80_REG_FAN_MIN(2));
 495
 496         /* Register sysfs hooks */
 497         if ((err = sysfs_create_group(&new_client->dev.kobj, &lm80_group)))
 498                 goto error_detach;
 499
 500         data->hwmon_dev = hwmon_device_register(&new_client->dev);
 501         if (IS_ERR(data->hwmon_dev)) {
 502                 err = PTR_ERR(data->hwmon_dev);
 503                 goto error_remove;
 504         }
 505
 506         return 0;
 507
 508 error_remove:
 509         sysfs_remove_group(&new_client->dev.kobj, &lm80_group);
 510 error_detach:
 511         i2c_detach_client(new_client);
 512 error_free:
 513         kfree(data);
 514 exit:
 515         return err;
 516 }
 517
 518 static int lm80_detach_client(struct i2c_client *client)
 519 {
 520         struct lm80_data *data = i2c_get_clientdata(client);
 521         int err;
 522
 523         hwmon_device_unregister(data->hwmon_dev);
 524         sysfs_remove_group(&client->dev.kobj, &lm80_group);
 525         if ((err = i2c_detach_client(client)))
 526                 return err;
 527
 528         kfree(data);
 529         return 0;
 530 }
 531
 532 static int lm80_read_value(struct i2c_client *client, u8 reg)
 533 {
 534         return i2c_smbus_read_byte_data(client, reg);
 535 }
 536
 537 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
 538 {
 539         return i2c_smbus_write_byte_data(client, reg, value);
 540 }
 541
 542 /* Called when we have found a new LM80. */
 543 static void lm80_init_client(struct i2c_client *client)
 544 {
 545         /* Reset all except Watchdog values and last conversion values
 546            This sets fan-divs to 2, among others. This makes most other
 547            initializations unnecessary */
 548         lm80_write_value(client, LM80_REG_CONFIG, 0x80);
 549         /* Set 11-bit temperature resolution */
 550         lm80_write_value(client, LM80_REG_RES, 0x08);
 551
 552         /* Start monitoring */
 553         lm80_write_value(client, LM80_REG_CONFIG, 0x01);
 554 }
 555
 556 static struct lm80_data *lm80_update_device(struct device *dev)
 557 {
 558         struct i2c_client *client = to_i2c_client(dev);
 559         struct lm80_data *data = i2c_get_clientdata(client);
 560         int i;
 561
 562         mutex_lock(&data->update_lock);
 563
 564         if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
 565                 dev_dbg(&client->dev, "Starting lm80 update\n");
 566                 for (i = 0; i <= 6; i++) {
 567                         data->in[i] =
 568                             lm80_read_value(client, LM80_REG_IN(i));
 569                         data->in_min[i] =
 570                             lm80_read_value(client, LM80_REG_IN_MIN(i));
 571                         data->in_max[i] =
 572                             lm80_read_value(client, LM80_REG_IN_MAX(i));
 573                 }
 574                 data->fan[0] = lm80_read_value(client, LM80_REG_FAN1);
 575                 data->fan_min[0] =
 576                     lm80_read_value(client, LM80_REG_FAN_MIN(1));
 577                 data->fan[1] = lm80_read_value(client, LM80_REG_FAN2);
 578                 data->fan_min[1] =
 579                     lm80_read_value(client, LM80_REG_FAN_MIN(2));
 580
 581                 data->temp =
 582                     (lm80_read_value(client, LM80_REG_TEMP) << 8) |
 583                     (lm80_read_value(client, LM80_REG_RES) & 0xf0);
 584                 data->temp_os_max =
 585                     lm80_read_value(client, LM80_REG_TEMP_OS_MAX);
 586                 data->temp_os_hyst =
 587                     lm80_read_value(client, LM80_REG_TEMP_OS_HYST);
 588                 data->temp_hot_max =
 589                     lm80_read_value(client, LM80_REG_TEMP_HOT_MAX);
 590                 data->temp_hot_hyst =
 591                     lm80_read_value(client, LM80_REG_TEMP_HOT_HYST);
 592
 593                 i = lm80_read_value(client, LM80_REG_FANDIV);
 594                 data->fan_div[0] = (i >> 2) & 0x03;
 595                 data->fan_div[1] = (i >> 4) & 0x03;
 596                 data->alarms = lm80_read_value(client, LM80_REG_ALARM1) +
 597                     (lm80_read_value(client, LM80_REG_ALARM2) << 8);
 598                 data->last_updated = jiffies;
 599                 data->valid = 1;
 600         }
 601
 602         mutex_unlock(&data->update_lock);
 603
 604         return data;
 605 }
 606
 607 static int __init sensors_lm80_init(void)
 608 {
 609         return i2c_add_driver(&lm80_driver);
 610 }
 611
 612 static void __exit sensors_lm80_exit(void)
 613 {
 614         i2c_del_driver(&lm80_driver);
 615 }
 616
 617 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
 618         "Philip Edelbrock <phil@netroedge.com>");
 619 MODULE_DESCRIPTION("LM80 driver");
 620 MODULE_LICENSE("GPL");
 621
 622 module_init(sensors_lm80_init);
 623 module_exit(sensors_lm80_exit);