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