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/i2c-sensor.h>
  30
  31 /* Addresses to scan */
  32 static unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c,
  33                                         0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
  34 static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
  35
  36 /* Insmod parameters */
  37 SENSORS_INSMOD_1(lm80);
  38
  39 /* Many LM80 constants specified below */
  40
  41 /* The LM80 registers */
  42 #define LM80_REG_IN_MAX(nr)             (0x2a + (nr) * 2)
  43 #define LM80_REG_IN_MIN(nr)             (0x2b + (nr) * 2)
  44 #define LM80_REG_IN(nr)                 (0x20 + (nr))
  45
  46 #define LM80_REG_FAN1                   0x28
  47 #define LM80_REG_FAN2                   0x29
  48 #define LM80_REG_FAN_MIN(nr)            (0x3b + (nr))
  49
  50 #define LM80_REG_TEMP                   0x27
  51 #define LM80_REG_TEMP_HOT_MAX           0x38
  52 #define LM80_REG_TEMP_HOT_HYST          0x39
  53 #define LM80_REG_TEMP_OS_MAX            0x3a
  54 #define LM80_REG_TEMP_OS_HYST           0x3b
  55
  56 #define LM80_REG_CONFIG                 0x00
  57 #define LM80_REG_ALARM1                 0x01
  58 #define LM80_REG_ALARM2                 0x02
  59 #define LM80_REG_MASK1                  0x03
  60 #define LM80_REG_MASK2                  0x04
  61 #define LM80_REG_FANDIV                 0x05
  62 #define LM80_REG_RES                    0x06
  63
  64
  65 /* Conversions. Rounding and limit checking is only done on the TO_REG
  66    variants. Note that you should be a bit careful with which arguments
  67    these macros are called: arguments may be evaluated more than once.
  68    Fixing this is just not worth it. */
  69
  70 #define IN_TO_REG(val)          (SENSORS_LIMIT(((val)+5)/10,0,255))
  71 #define IN_FROM_REG(val)        ((val)*10)
  72
  73 static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
  74 {
  75         if (rpm == 0)
  76                 return 255;
  77         rpm = SENSORS_LIMIT(rpm, 1, 1000000);
  78         return SENSORS_LIMIT((1350000 + rpm*div / 2) / (rpm*div), 1, 254);
  79 }
  80
  81 #define FAN_FROM_REG(val,div)   ((val)==0?-1:\
  82                                 (val)==255?0:1350000/((div)*(val)))
  83
  84 static inline long TEMP_FROM_REG(u16 temp)
  85 {
  86         long res;
  87
  88         temp >>= 4;
  89         if (temp < 0x0800)
  90                 res = 625 * (long) temp;
  91         else
  92                 res = ((long) temp - 0x01000) * 625;
  93
  94         return res / 10;
  95 }
  96
  97 #define TEMP_LIMIT_FROM_REG(val)        (((val)>0x80?(val)-0x100:(val))*1000)
  98
  99 #define TEMP_LIMIT_TO_REG(val)          SENSORS_LIMIT((val)<0?\
 100                                         ((val)-500)/1000:((val)+500)/1000,0,255)
 101
 102 #define DIV_FROM_REG(val)               (1 << (val))
 103
 104 /*
 105  * Client data (each client gets its own)
 106  */
 107
 108 struct lm80_data {
 109         struct i2c_client client;
 110         struct semaphore update_lock;
 111         char valid;             /* !=0 if following fields are valid */
 112         unsigned long last_updated;     /* In jiffies */
 113
 114         u8 in[7];               /* Register value */
 115         u8 in_max[7];           /* Register value */
 116         u8 in_min[7];           /* Register value */
 117         u8 fan[2];              /* Register value */
 118         u8 fan_min[2];          /* Register value */
 119         u8 fan_div[2];          /* Register encoding, shifted right */
 120         u16 temp;               /* Register values, shifted right */
 121         u8 temp_hot_max;        /* Register value */
 122         u8 temp_hot_hyst;       /* Register value */
 123         u8 temp_os_max;         /* Register value */
 124         u8 temp_os_hyst;        /* Register value */
 125         u16 alarms;             /* Register encoding, combined */
 126 };
 127
 128 /*
 129  * Functions declaration
 130  */
 131
 132 static int lm80_attach_adapter(struct i2c_adapter *adapter);
 133 static int lm80_detect(struct i2c_adapter *adapter, int address, int kind);
 134 static void lm80_init_client(struct i2c_client *client);
 135 static int lm80_detach_client(struct i2c_client *client);
 136 static struct lm80_data *lm80_update_device(struct device *dev);
 137 static int lm80_read_value(struct i2c_client *client, u8 reg);
 138 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
 139
 140 /*
 141  * Driver data (common to all clients)
 142  */
 143
 144 static struct i2c_driver lm80_driver = {
 145         .owner          = THIS_MODULE,
 146         .name           = "lm80",
 147         .id             = I2C_DRIVERID_LM80,
 148         .flags          = I2C_DF_NOTIFY,
 149         .attach_adapter = lm80_attach_adapter,
 150         .detach_client  = lm80_detach_client,
 151 };
 152
 153 /*
 154  * Sysfs stuff
 155  */
 156
 157 #define show_in(suffix, value) \
 158 static ssize_t show_in_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
 159 { \
 160         struct lm80_data *data = lm80_update_device(dev); \
 161         return sprintf(buf, "%d\n", IN_FROM_REG(data->value)); \
 162 }
 163 show_in(min0, in_min[0]);
 164 show_in(min1, in_min[1]);
 165 show_in(min2, in_min[2]);
 166 show_in(min3, in_min[3]);
 167 show_in(min4, in_min[4]);
 168 show_in(min5, in_min[5]);
 169 show_in(min6, in_min[6]);
 170 show_in(max0, in_max[0]);
 171 show_in(max1, in_max[1]);
 172 show_in(max2, in_max[2]);
 173 show_in(max3, in_max[3]);
 174 show_in(max4, in_max[4]);
 175 show_in(max5, in_max[5]);
 176 show_in(max6, in_max[6]);
 177 show_in(input0, in[0]);
 178 show_in(input1, in[1]);
 179 show_in(input2, in[2]);
 180 show_in(input3, in[3]);
 181 show_in(input4, in[4]);
 182 show_in(input5, in[5]);
 183 show_in(input6, in[6]);
 184
 185 #define set_in(suffix, value, reg) \
 186 static ssize_t set_in_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
 187         size_t count) \
 188 { \
 189         struct i2c_client *client = to_i2c_client(dev); \
 190         struct lm80_data *data = i2c_get_clientdata(client); \
 191         long val = simple_strtol(buf, NULL, 10); \
 192  \
 193         down(&data->update_lock);\
 194         data->value = IN_TO_REG(val); \
 195         lm80_write_value(client, reg, data->value); \
 196         up(&data->update_lock);\
 197         return count; \
 198 }
 199 set_in(min0, in_min[0], LM80_REG_IN_MIN(0));
 200 set_in(min1, in_min[1], LM80_REG_IN_MIN(1));
 201 set_in(min2, in_min[2], LM80_REG_IN_MIN(2));
 202 set_in(min3, in_min[3], LM80_REG_IN_MIN(3));
 203 set_in(min4, in_min[4], LM80_REG_IN_MIN(4));
 204 set_in(min5, in_min[5], LM80_REG_IN_MIN(5));
 205 set_in(min6, in_min[6], LM80_REG_IN_MIN(6));
 206 set_in(max0, in_max[0], LM80_REG_IN_MAX(0));
 207 set_in(max1, in_max[1], LM80_REG_IN_MAX(1));
 208 set_in(max2, in_max[2], LM80_REG_IN_MAX(2));
 209 set_in(max3, in_max[3], LM80_REG_IN_MAX(3));
 210 set_in(max4, in_max[4], LM80_REG_IN_MAX(4));
 211 set_in(max5, in_max[5], LM80_REG_IN_MAX(5));
 212 set_in(max6, in_max[6], LM80_REG_IN_MAX(6));
 213
 214 #define show_fan(suffix, value, div) \
 215 static ssize_t show_fan_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
 216 { \
 217         struct lm80_data *data = lm80_update_device(dev); \
 218         return sprintf(buf, "%d\n", FAN_FROM_REG(data->value, \
 219                        DIV_FROM_REG(data->div))); \
 220 }
 221 show_fan(min1, fan_min[0], fan_div[0]);
 222 show_fan(min2, fan_min[1], fan_div[1]);
 223 show_fan(input1, fan[0], fan_div[0]);
 224 show_fan(input2, fan[1], fan_div[1]);
 225
 226 #define show_fan_div(suffix, value) \
 227 static ssize_t show_fan_div##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
 228 { \
 229         struct lm80_data *data = lm80_update_device(dev); \
 230         return sprintf(buf, "%d\n", DIV_FROM_REG(data->value)); \
 231 }
 232 show_fan_div(1, fan_div[0]);
 233 show_fan_div(2, fan_div[1]);
 234
 235 #define set_fan(suffix, value, reg, div) \
 236 static ssize_t set_fan_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
 237         size_t count) \
 238 { \
 239         struct i2c_client *client = to_i2c_client(dev); \
 240         struct lm80_data *data = i2c_get_clientdata(client); \
 241         long val = simple_strtoul(buf, NULL, 10); \
 242  \
 243         down(&data->update_lock);\
 244         data->value = FAN_TO_REG(val, DIV_FROM_REG(data->div)); \
 245         lm80_write_value(client, reg, data->value); \
 246         up(&data->update_lock);\
 247         return count; \
 248 }
 249 set_fan(min1, fan_min[0], LM80_REG_FAN_MIN(1), fan_div[0]);
 250 set_fan(min2, fan_min[1], LM80_REG_FAN_MIN(2), fan_div[1]);
 251
 252 /* Note: we save and restore the fan minimum here, because its value is
 253    determined in part by the fan divisor.  This follows the principle of
 254    least suprise; the user doesn't expect the fan minimum to change just
 255    because the divisor changed. */
 256 static ssize_t set_fan_div(struct device *dev, const char *buf,
 257         size_t count, int nr)
 258 {
 259         struct i2c_client *client = to_i2c_client(dev);
 260         struct lm80_data *data = i2c_get_clientdata(client);
 261         unsigned long min, val = simple_strtoul(buf, NULL, 10);
 262         u8 reg;
 263
 264         /* Save fan_min */
 265         down(&data->update_lock);
 266         min = FAN_FROM_REG(data->fan_min[nr],
 267                            DIV_FROM_REG(data->fan_div[nr]));
 268
 269         switch (val) {
 270         case 1: data->fan_div[nr] = 0; break;
 271         case 2: data->fan_div[nr] = 1; break;
 272         case 4: data->fan_div[nr] = 2; break;
 273         case 8: data->fan_div[nr] = 3; break;
 274         default:
 275                 dev_err(&client->dev, "fan_div value %ld not "
 276                         "supported. Choose one of 1, 2, 4 or 8!\n", val);
 277                 up(&data->update_lock);
 278                 return -EINVAL;
 279         }
 280
 281         reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1))))
 282             | (data->fan_div[nr] << (2 * (nr + 1)));
 283         lm80_write_value(client, LM80_REG_FANDIV, reg);
 284
 285         /* Restore fan_min */
 286         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 287         lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
 288         up(&data->update_lock);
 289
 290         return count;
 291 }
 292
 293 #define set_fan_div(number) \
 294 static ssize_t set_fan_div##number(struct device *dev, struct device_attribute *attr, const char *buf, \
 295         size_t count) \
 296 { \
 297         return set_fan_div(dev, buf, count, number - 1); \
 298 }
 299 set_fan_div(1);
 300 set_fan_div(2);
 301
 302 static ssize_t show_temp_input1(struct device *dev, struct device_attribute *attr, char *buf)
 303 {
 304         struct lm80_data *data = lm80_update_device(dev);
 305         return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp));
 306 }
 307
 308 #define show_temp(suffix, value) \
 309 static ssize_t show_temp_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
 310 { \
 311         struct lm80_data *data = lm80_update_device(dev); \
 312         return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
 313 }
 314 show_temp(hot_max, temp_hot_max);
 315 show_temp(hot_hyst, temp_hot_hyst);
 316 show_temp(os_max, temp_os_max);
 317 show_temp(os_hyst, temp_os_hyst);
 318
 319 #define set_temp(suffix, value, reg) \
 320 static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
 321         size_t count) \
 322 { \
 323         struct i2c_client *client = to_i2c_client(dev); \
 324         struct lm80_data *data = i2c_get_clientdata(client); \
 325         long val = simple_strtoul(buf, NULL, 10); \
 326  \
 327         down(&data->update_lock); \
 328         data->value = TEMP_LIMIT_TO_REG(val); \
 329         lm80_write_value(client, reg, data->value); \
 330         up(&data->update_lock); \
 331         return count; \
 332 }
 333 set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX);
 334 set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST);
 335 set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX);
 336 set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST);
 337
 338 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 339 {
 340         struct lm80_data *data = lm80_update_device(dev);
 341         return sprintf(buf, "%u\n", data->alarms);
 342 }
 343
 344 static DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min0, set_in_min0);
 345 static DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min1, set_in_min1);
 346 static DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min2, set_in_min2);
 347 static DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO, show_in_min3, set_in_min3);
 348 static DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO, show_in_min4, set_in_min4);
 349 static DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO, show_in_min5, set_in_min5);
 350 static DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO, show_in_min6, set_in_min6);
 351 static DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max0, set_in_max0);
 352 static DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max1, set_in_max1);
 353 static DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max2, set_in_max2);
 354 static DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO, show_in_max3, set_in_max3);
 355 static DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO, show_in_max4, set_in_max4);
 356 static DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO, show_in_max5, set_in_max5);
 357 static DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO, show_in_max6, set_in_max6);
 358 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
 359 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
 360 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
 361 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
 362 static DEVICE_ATTR(in4_input, S_IRUGO, show_in_input4, NULL);
 363 static DEVICE_ATTR(in5_input, S_IRUGO, show_in_input5, NULL);
 364 static DEVICE_ATTR(in6_input, S_IRUGO, show_in_input6, NULL);
 365 static DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min1,
 366     set_fan_min1);
 367 static DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min2,
 368     set_fan_min2);
 369 static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input1, NULL);
 370 static DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input2, NULL);
 371 static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div1, set_fan_div1);
 372 static DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div2, set_fan_div2);
 373 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
 374 static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max,
 375     set_temp_hot_max);
 376 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst,
 377     set_temp_hot_hyst);
 378 static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max,
 379     set_temp_os_max);
 380 static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst,
 381     set_temp_os_hyst);
 382 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 383
 384 /*
 385  * Real code
 386  */
 387
 388 static int lm80_attach_adapter(struct i2c_adapter *adapter)
 389 {
 390         if (!(adapter->class & I2C_CLASS_HWMON))
 391                 return 0;
 392         return i2c_detect(adapter, &addr_data, lm80_detect);
 393 }
 394
 395 int lm80_detect(struct i2c_adapter *adapter, int address, int kind)
 396 {
 397         int i, cur;
 398         struct i2c_client *new_client;
 399         struct lm80_data *data;
 400         int err = 0;
 401         const char *name;
 402
 403         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 404                 goto exit;
 405
 406         /* OK. For now, we presume we have a valid client. We now create the
 407            client structure, even though we cannot fill it completely yet.
 408            But it allows us to access lm80_{read,write}_value. */
 409         if (!(data = kmalloc(sizeof(struct lm80_data), GFP_KERNEL))) {
 410                 err = -ENOMEM;
 411                 goto exit;
 412         }
 413         memset(data, 0, sizeof(struct lm80_data));
 414
 415         new_client = &data->client;
 416         i2c_set_clientdata(new_client, data);
 417         new_client->addr = address;
 418         new_client->adapter = adapter;
 419         new_client->driver = &lm80_driver;
 420         new_client->flags = 0;
 421
 422         /* Now, we do the remaining detection. It is lousy. */
 423         if (lm80_read_value(new_client, LM80_REG_ALARM2) & 0xc0)
 424                 goto error_free;
 425         for (i = 0x2a; i <= 0x3d; i++) {
 426                 cur = i2c_smbus_read_byte_data(new_client, i);
 427                 if ((i2c_smbus_read_byte_data(new_client, i + 0x40) != cur)
 428                  || (i2c_smbus_read_byte_data(new_client, i + 0x80) != cur)
 429                  || (i2c_smbus_read_byte_data(new_client, i + 0xc0) != cur))
 430                     goto error_free;
 431         }
 432
 433         /* Determine the chip type - only one kind supported! */
 434         kind = lm80;
 435         name = "lm80";
 436
 437         /* Fill in the remaining client fields and put it into the global list */
 438         strlcpy(new_client->name, name, I2C_NAME_SIZE);
 439         data->valid = 0;
 440         init_MUTEX(&data->update_lock);
 441
 442         /* Tell the I2C layer a new client has arrived */
 443         if ((err = i2c_attach_client(new_client)))
 444                 goto error_free;
 445
 446         /* Initialize the LM80 chip */
 447         lm80_init_client(new_client);
 448
 449         /* A few vars need to be filled upon startup */
 450         data->fan_min[0] = lm80_read_value(new_client, LM80_REG_FAN_MIN(1));
 451         data->fan_min[1] = lm80_read_value(new_client, LM80_REG_FAN_MIN(2));
 452
 453         /* Register sysfs hooks */
 454         device_create_file(&new_client->dev, &dev_attr_in0_min);
 455         device_create_file(&new_client->dev, &dev_attr_in1_min);
 456         device_create_file(&new_client->dev, &dev_attr_in2_min);
 457         device_create_file(&new_client->dev, &dev_attr_in3_min);
 458         device_create_file(&new_client->dev, &dev_attr_in4_min);
 459         device_create_file(&new_client->dev, &dev_attr_in5_min);
 460         device_create_file(&new_client->dev, &dev_attr_in6_min);
 461         device_create_file(&new_client->dev, &dev_attr_in0_max);
 462         device_create_file(&new_client->dev, &dev_attr_in1_max);
 463         device_create_file(&new_client->dev, &dev_attr_in2_max);
 464         device_create_file(&new_client->dev, &dev_attr_in3_max);
 465         device_create_file(&new_client->dev, &dev_attr_in4_max);
 466         device_create_file(&new_client->dev, &dev_attr_in5_max);
 467         device_create_file(&new_client->dev, &dev_attr_in6_max);
 468         device_create_file(&new_client->dev, &dev_attr_in0_input);
 469         device_create_file(&new_client->dev, &dev_attr_in1_input);
 470         device_create_file(&new_client->dev, &dev_attr_in2_input);
 471         device_create_file(&new_client->dev, &dev_attr_in3_input);
 472         device_create_file(&new_client->dev, &dev_attr_in4_input);
 473         device_create_file(&new_client->dev, &dev_attr_in5_input);
 474         device_create_file(&new_client->dev, &dev_attr_in6_input);
 475         device_create_file(&new_client->dev, &dev_attr_fan1_min);
 476         device_create_file(&new_client->dev, &dev_attr_fan2_min);
 477         device_create_file(&new_client->dev, &dev_attr_fan1_input);
 478         device_create_file(&new_client->dev, &dev_attr_fan2_input);
 479         device_create_file(&new_client->dev, &dev_attr_fan1_div);
 480         device_create_file(&new_client->dev, &dev_attr_fan2_div);
 481         device_create_file(&new_client->dev, &dev_attr_temp1_input);
 482         device_create_file(&new_client->dev, &dev_attr_temp1_max);
 483         device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
 484         device_create_file(&new_client->dev, &dev_attr_temp1_crit);
 485         device_create_file(&new_client->dev, &dev_attr_temp1_crit_hyst);
 486         device_create_file(&new_client->dev, &dev_attr_alarms);
 487
 488         return 0;
 489
 490 error_free:
 491         kfree(data);
 492 exit:
 493         return err;
 494 }
 495
 496 static int lm80_detach_client(struct i2c_client *client)
 497 {
 498         int err;
 499
 500         if ((err = i2c_detach_client(client))) {
 501                 dev_err(&client->dev, "Client deregistration failed, "
 502                         "client not detached.\n");
 503                 return err;
 504         }
 505
 506         kfree(i2c_get_clientdata(client));
 507         return 0;
 508 }
 509
 510 static int lm80_read_value(struct i2c_client *client, u8 reg)
 511 {
 512         return i2c_smbus_read_byte_data(client, reg);
 513 }
 514
 515 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
 516 {
 517         return i2c_smbus_write_byte_data(client, reg, value);
 518 }
 519
 520 /* Called when we have found a new LM80. */
 521 static void lm80_init_client(struct i2c_client *client)
 522 {
 523         /* Reset all except Watchdog values and last conversion values
 524            This sets fan-divs to 2, among others. This makes most other
 525            initializations unnecessary */
 526         lm80_write_value(client, LM80_REG_CONFIG, 0x80);
 527         /* Set 11-bit temperature resolution */
 528         lm80_write_value(client, LM80_REG_RES, 0x08);
 529
 530         /* Start monitoring */
 531         lm80_write_value(client, LM80_REG_CONFIG, 0x01);
 532 }
 533
 534 static struct lm80_data *lm80_update_device(struct device *dev)
 535 {
 536         struct i2c_client *client = to_i2c_client(dev);
 537         struct lm80_data *data = i2c_get_clientdata(client);
 538         int i;
 539
 540         down(&data->update_lock);
 541
 542         if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
 543                 dev_dbg(&client->dev, "Starting lm80 update\n");
 544                 for (i = 0; i <= 6; i++) {
 545                         data->in[i] =
 546                             lm80_read_value(client, LM80_REG_IN(i));
 547                         data->in_min[i] =
 548                             lm80_read_value(client, LM80_REG_IN_MIN(i));
 549                         data->in_max[i] =
 550                             lm80_read_value(client, LM80_REG_IN_MAX(i));
 551                 }
 552                 data->fan[0] = lm80_read_value(client, LM80_REG_FAN1);
 553                 data->fan_min[0] =
 554                     lm80_read_value(client, LM80_REG_FAN_MIN(1));
 555                 data->fan[1] = lm80_read_value(client, LM80_REG_FAN2);
 556                 data->fan_min[1] =
 557                     lm80_read_value(client, LM80_REG_FAN_MIN(2));
 558
 559                 data->temp =
 560                     (lm80_read_value(client, LM80_REG_TEMP) << 8) |
 561                     (lm80_read_value(client, LM80_REG_RES) & 0xf0);
 562                 data->temp_os_max =
 563                     lm80_read_value(client, LM80_REG_TEMP_OS_MAX);
 564                 data->temp_os_hyst =
 565                     lm80_read_value(client, LM80_REG_TEMP_OS_HYST);
 566                 data->temp_hot_max =
 567                     lm80_read_value(client, LM80_REG_TEMP_HOT_MAX);
 568                 data->temp_hot_hyst =
 569                     lm80_read_value(client, LM80_REG_TEMP_HOT_HYST);
 570
 571                 i = lm80_read_value(client, LM80_REG_FANDIV);
 572                 data->fan_div[0] = (i >> 2) & 0x03;
 573                 data->fan_div[1] = (i >> 4) & 0x03;
 574                 data->alarms = lm80_read_value(client, LM80_REG_ALARM1) +
 575                     (lm80_read_value(client, LM80_REG_ALARM2) << 8);
 576                 data->last_updated = jiffies;
 577                 data->valid = 1;
 578         }
 579
 580         up(&data->update_lock);
 581
 582         return data;
 583 }
 584
 585 static int __init sensors_lm80_init(void)
 586 {
 587         return i2c_add_driver(&lm80_driver);
 588 }
 589
 590 static void __exit sensors_lm80_exit(void)
 591 {
 592         i2c_del_driver(&lm80_driver);
 593 }
 594
 595 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
 596         "Philip Edelbrock <phil@netroedge.com>");
 597 MODULE_DESCRIPTION("LM80 driver");
 598 MODULE_LICENSE("GPL");
 599
 600 module_init(sensors_lm80_init);
 601 module_exit(sensors_lm80_exit);