git.oblomov.eu Git - linux-2.6/blob - drivers/hwmon/adm9240.c

   1 /*
   2  * adm9240.c    Part of lm_sensors, Linux kernel modules for hardware
   3  *              monitoring
   4  *
   5  * Copyright (C) 1999   Frodo Looijaard <frodol@dds.nl>
   6  *                      Philip Edelbrock <phil@netroedge.com>
   7  * Copyright (C) 2003   Michiel Rook <michiel@grendelproject.nl>
   8  * Copyright (C) 2005   Grant Coady <gcoady@gmail.com> with valuable
   9  *                              guidance from Jean Delvare
  10  *
  11  * Driver supports      Analog Devices          ADM9240
  12  *                      Dallas Semiconductor    DS1780
  13  *                      National Semiconductor  LM81
  14  *
  15  * ADM9240 is the reference, DS1780 and LM81 are register compatibles
  16  *
  17  * Voltage      Six inputs are scaled by chip, VID also reported
  18  * Temperature  Chip temperature to 0.5'C, maximum and max_hysteris
  19  * Fans         2 fans, low speed alarm, automatic fan clock divider
  20  * Alarms       16-bit map of active alarms
  21  * Analog Out   0..1250 mV output
  22  *
  23  * Chassis Intrusion: clear CI latch with 'echo 1 > chassis_clear'
  24  *
  25  * Test hardware: Intel SE440BX-2 desktop motherboard --Grant
  26  *
  27  * LM81 extended temp reading not implemented
  28  *
  29  * This program is free software; you can redistribute it and/or modify
  30  * it under the terms of the GNU General Public License as published by
  31  * the Free Software Foundation; either version 2 of the License, or
  32  * (at your option) any later version.
  33  *
  34  * This program is distributed in the hope that it will be useful,
  35  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  36  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  37  * GNU General Public License for more details.
  38  *
  39  * You should have received a copy of the GNU General Public License
  40  * along with this program; if not, write to the Free Software
  41  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  42  */
  43
  44 #include <linux/init.h>
  45 #include <linux/module.h>
  46 #include <linux/slab.h>
  47 #include <linux/i2c.h>
  48 #include <linux/hwmon.h>
  49 #include <linux/hwmon-vid.h>
  50 #include <linux/err.h>
  51
  52 /* Addresses to scan */
  53 static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
  54                                         I2C_CLIENT_END };
  55
  56 /* Insmod parameters */
  57 I2C_CLIENT_INSMOD_3(adm9240, ds1780, lm81);
  58
  59 /* ADM9240 registers */
  60 #define ADM9240_REG_MAN_ID              0x3e
  61 #define ADM9240_REG_DIE_REV             0x3f
  62 #define ADM9240_REG_CONFIG              0x40
  63
  64 #define ADM9240_REG_IN(nr)              (0x20 + (nr))   /* 0..5 */
  65 #define ADM9240_REG_IN_MAX(nr)          (0x2b + (nr) * 2)
  66 #define ADM9240_REG_IN_MIN(nr)          (0x2c + (nr) * 2)
  67 #define ADM9240_REG_FAN(nr)             (0x28 + (nr))   /* 0..1 */
  68 #define ADM9240_REG_FAN_MIN(nr)         (0x3b + (nr))
  69 #define ADM9240_REG_INT(nr)             (0x41 + (nr))
  70 #define ADM9240_REG_INT_MASK(nr)        (0x43 + (nr))
  71 #define ADM9240_REG_TEMP                0x27
  72 #define ADM9240_REG_TEMP_HIGH           0x39
  73 #define ADM9240_REG_TEMP_HYST           0x3a
  74 #define ADM9240_REG_ANALOG_OUT          0x19
  75 #define ADM9240_REG_CHASSIS_CLEAR       0x46
  76 #define ADM9240_REG_VID_FAN_DIV         0x47
  77 #define ADM9240_REG_I2C_ADDR            0x48
  78 #define ADM9240_REG_VID4                0x49
  79 #define ADM9240_REG_TEMP_CONF           0x4b
  80
  81 /* generalised scaling with integer rounding */
  82 static inline int SCALE(long val, int mul, int div)
  83 {
  84         if (val < 0)
  85                 return (val * mul - div / 2) / div;
  86         else
  87                 return (val * mul + div / 2) / div;
  88 }
  89
  90 /* adm9240 internally scales voltage measurements */
  91 static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
  92
  93 static inline unsigned int IN_FROM_REG(u8 reg, int n)
  94 {
  95         return SCALE(reg, nom_mv[n], 192);
  96 }
  97
  98 static inline u8 IN_TO_REG(unsigned long val, int n)
  99 {
 100         return SENSORS_LIMIT(SCALE(val, 192, nom_mv[n]), 0, 255);
 101 }
 102
 103 /* temperature range: -40..125, 127 disables temperature alarm */
 104 static inline s8 TEMP_TO_REG(long val)
 105 {
 106         return SENSORS_LIMIT(SCALE(val, 1, 1000), -40, 127);
 107 }
 108
 109 /* two fans, each with low fan speed limit */
 110 static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
 111 {
 112         if (!reg) /* error */
 113                 return -1;
 114
 115         if (reg == 255)
 116                 return 0;
 117
 118         return SCALE(1350000, 1, reg * div);
 119 }
 120
 121 /* analog out 0..1250mV */
 122 static inline u8 AOUT_TO_REG(unsigned long val)
 123 {
 124         return SENSORS_LIMIT(SCALE(val, 255, 1250), 0, 255);
 125 }
 126
 127 static inline unsigned int AOUT_FROM_REG(u8 reg)
 128 {
 129         return SCALE(reg, 1250, 255);
 130 }
 131
 132 static int adm9240_attach_adapter(struct i2c_adapter *adapter);
 133 static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind);
 134 static void adm9240_init_client(struct i2c_client *client);
 135 static int adm9240_detach_client(struct i2c_client *client);
 136 static struct adm9240_data *adm9240_update_device(struct device *dev);
 137
 138 /* driver data */
 139 static struct i2c_driver adm9240_driver = {
 140         .owner          = THIS_MODULE,
 141         .name           = "adm9240",
 142         .id             = I2C_DRIVERID_ADM9240,
 143         .flags          = I2C_DF_NOTIFY,
 144         .attach_adapter = adm9240_attach_adapter,
 145         .detach_client  = adm9240_detach_client,
 146 };
 147
 148 /* per client data */
 149 struct adm9240_data {
 150         enum chips type;
 151         struct i2c_client client;
 152         struct class_device *class_dev;
 153         struct semaphore update_lock;
 154         char valid;
 155         unsigned long last_updated_measure;
 156         unsigned long last_updated_config;
 157
 158         u8 in[6];               /* ro   in0_input */
 159         u8 in_max[6];           /* rw   in0_max */
 160         u8 in_min[6];           /* rw   in0_min */
 161         u8 fan[2];              /* ro   fan1_input */
 162         u8 fan_min[2];          /* rw   fan1_min */
 163         u8 fan_div[2];          /* rw   fan1_div, read-only accessor */
 164         s16 temp;               /* ro   temp1_input, 9-bit sign-extended */
 165         s8 temp_high;           /* rw   temp1_max */
 166         s8 temp_hyst;           /* rw   temp1_max_hyst */
 167         u16 alarms;             /* ro   alarms */
 168         u8 aout;                /* rw   aout_output */
 169         u8 vid;                 /* ro   vid */
 170         u8 vrm;                 /* --   vrm set on startup, no accessor */
 171 };
 172
 173 /* i2c byte read/write interface */
 174 static int adm9240_read_value(struct i2c_client *client, u8 reg)
 175 {
 176         return i2c_smbus_read_byte_data(client, reg);
 177 }
 178
 179 static int adm9240_write_value(struct i2c_client *client, u8 reg, u8 value)
 180 {
 181         return i2c_smbus_write_byte_data(client, reg, value);
 182 }
 183
 184 /*** sysfs accessors ***/
 185
 186 /* temperature */
 187 #define show_temp(value, scale)                                 \
 188 static ssize_t show_##value(struct device *dev,                 \
 189                             struct device_attribute *attr,      \
 190                             char *buf)                          \
 191 {                                                               \
 192         struct adm9240_data *data = adm9240_update_device(dev); \
 193         return sprintf(buf, "%d\n", data->value * scale);       \
 194 }
 195 show_temp(temp_high, 1000);
 196 show_temp(temp_hyst, 1000);
 197 show_temp(temp, 500); /* 0.5'C per bit */
 198
 199 #define set_temp(value, reg)                                    \
 200 static ssize_t set_##value(struct device *dev,                  \
 201                            struct device_attribute *attr,       \
 202                            const char *buf, size_t count)       \
 203 {                                                               \
 204         struct i2c_client *client = to_i2c_client(dev);         \
 205         struct adm9240_data *data = adm9240_update_device(dev); \
 206         long temp = simple_strtoul(buf, NULL, 10);              \
 207                                                                 \
 208         down(&data->update_lock);                               \
 209         data->value = TEMP_TO_REG(temp);                        \
 210         adm9240_write_value(client, reg, data->value);          \
 211         up(&data->update_lock);                                 \
 212         return count;                                           \
 213 }
 214
 215 set_temp(temp_high, ADM9240_REG_TEMP_HIGH);
 216 set_temp(temp_hyst, ADM9240_REG_TEMP_HYST);
 217
 218 static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
 219                 show_temp_high, set_temp_high);
 220 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
 221                 show_temp_hyst, set_temp_hyst);
 222 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
 223
 224 /* voltage */
 225 static ssize_t show_in(struct device *dev, char *buf, int nr)
 226 {
 227         struct adm9240_data *data = adm9240_update_device(dev);
 228         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
 229 }
 230
 231 static ssize_t show_in_min(struct device *dev, char *buf, int nr)
 232 {
 233         struct adm9240_data *data = adm9240_update_device(dev);
 234         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
 235 }
 236
 237 static ssize_t show_in_max(struct device *dev, char *buf, int nr)
 238 {
 239         struct adm9240_data *data = adm9240_update_device(dev);
 240         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));
 241 }
 242
 243 static ssize_t set_in_min(struct device *dev, const char *buf,
 244                 size_t count, int nr)
 245 {
 246         struct i2c_client *client = to_i2c_client(dev);
 247         struct adm9240_data *data = i2c_get_clientdata(client);
 248         unsigned long val = simple_strtoul(buf, NULL, 10);
 249
 250         down(&data->update_lock);
 251         data->in_min[nr] = IN_TO_REG(val, nr);
 252         adm9240_write_value(client, ADM9240_REG_IN_MIN(nr), data->in_min[nr]);
 253         up(&data->update_lock);
 254         return count;
 255 }
 256
 257 static ssize_t set_in_max(struct device *dev, const char *buf,
 258                 size_t count, int nr)
 259 {
 260         struct i2c_client *client = to_i2c_client(dev);
 261         struct adm9240_data *data = i2c_get_clientdata(client);
 262         unsigned long val = simple_strtoul(buf, NULL, 10);
 263
 264         down(&data->update_lock);
 265         data->in_max[nr] = IN_TO_REG(val, nr);
 266         adm9240_write_value(client, ADM9240_REG_IN_MAX(nr), data->in_max[nr]);
 267         up(&data->update_lock);
 268         return count;
 269 }
 270
 271 #define show_in_offset(offset)                                          \
 272 static ssize_t show_in##offset(struct device *dev,                      \
 273                                struct device_attribute *attr,           \
 274                                char *buf)                               \
 275 {                                                                       \
 276         return show_in(dev, buf, offset);                               \
 277 }                                                                       \
 278 static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL); \
 279 static ssize_t show_in##offset##_min(struct device *dev,                \
 280                                      struct device_attribute *attr,     \
 281                                      char *buf)                         \
 282 {                                                                       \
 283         return show_in_min(dev, buf, offset);                           \
 284 }                                                                       \
 285 static ssize_t show_in##offset##_max(struct device *dev,                \
 286                                      struct device_attribute *attr,     \
 287                                      char *buf)                         \
 288 {                                                                       \
 289         return show_in_max(dev, buf, offset);                           \
 290 }                                                                       \
 291 static ssize_t                                                          \
 292 set_in##offset##_min(struct device *dev,                                \
 293                      struct device_attribute *attr, const char *buf,    \
 294                      size_t count)                                      \
 295 {                                                                       \
 296         return set_in_min(dev, buf, count, offset);                     \
 297 }                                                                       \
 298 static ssize_t                                                          \
 299 set_in##offset##_max(struct device *dev,                                \
 300                      struct device_attribute *attr, const char *buf,    \
 301                      size_t count)                                      \
 302 {                                                                       \
 303         return set_in_max(dev, buf, count, offset);                     \
 304 }                                                                       \
 305 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,                 \
 306                 show_in##offset##_min, set_in##offset##_min);           \
 307 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,                 \
 308                 show_in##offset##_max, set_in##offset##_max);
 309
 310 show_in_offset(0);
 311 show_in_offset(1);
 312 show_in_offset(2);
 313 show_in_offset(3);
 314 show_in_offset(4);
 315 show_in_offset(5);
 316
 317 /* fans */
 318 static ssize_t show_fan(struct device *dev, char *buf, int nr)
 319 {
 320         struct adm9240_data *data = adm9240_update_device(dev);
 321         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 322                                 1 << data->fan_div[nr]));
 323 }
 324
 325 static ssize_t show_fan_min(struct device *dev, char *buf, int nr)
 326 {
 327         struct adm9240_data *data = adm9240_update_device(dev);
 328         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 329                                 1 << data->fan_div[nr]));
 330 }
 331
 332 static ssize_t show_fan_div(struct device *dev, char *buf, int nr)
 333 {
 334         struct adm9240_data *data = adm9240_update_device(dev);
 335         return sprintf(buf, "%d\n", 1 << data->fan_div[nr]);
 336 }
 337
 338 /* write new fan div, callers must hold data->update_lock */
 339 static void adm9240_write_fan_div(struct i2c_client *client, int nr,
 340                 u8 fan_div)
 341 {
 342         u8 reg, old, shift = (nr + 2) * 2;
 343
 344         reg = adm9240_read_value(client, ADM9240_REG_VID_FAN_DIV);
 345         old = (reg >> shift) & 3;
 346         reg &= ~(3 << shift);
 347         reg |= (fan_div << shift);
 348         adm9240_write_value(client, ADM9240_REG_VID_FAN_DIV, reg);
 349         dev_dbg(&client->dev, "fan%d clock divider changed from %u "
 350                         "to %u\n", nr + 1, 1 << old, 1 << fan_div);
 351 }
 352
 353 /*
 354  * set fan speed low limit:
 355  *
 356  * - value is zero: disable fan speed low limit alarm
 357  *
 358  * - value is below fan speed measurement range: enable fan speed low
 359  *   limit alarm to be asserted while fan speed too slow to measure
 360  *
 361  * - otherwise: select fan clock divider to suit fan speed low limit,
 362  *   measurement code may adjust registers to ensure fan speed reading
 363  */
 364 static ssize_t set_fan_min(struct device *dev, const char *buf,
 365                 size_t count, int nr)
 366 {
 367         struct i2c_client *client = to_i2c_client(dev);
 368         struct adm9240_data *data = i2c_get_clientdata(client);
 369         unsigned long val = simple_strtoul(buf, NULL, 10);
 370         u8 new_div;
 371
 372         down(&data->update_lock);
 373
 374         if (!val) {
 375                 data->fan_min[nr] = 255;
 376                 new_div = data->fan_div[nr];
 377
 378                 dev_dbg(&client->dev, "fan%u low limit set disabled\n",
 379                                 nr + 1);
 380
 381         } else if (val < 1350000 / (8 * 254)) {
 382                 new_div = 3;
 383                 data->fan_min[nr] = 254;
 384
 385                 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
 386                                 nr + 1, FAN_FROM_REG(254, 1 << new_div));
 387
 388         } else {
 389                 unsigned int new_min = 1350000 / val;
 390
 391                 new_div = 0;
 392                 while (new_min > 192 && new_div < 3) {
 393                         new_div++;
 394                         new_min /= 2;
 395                 }
 396                 if (!new_min) /* keep > 0 */
 397                         new_min++;
 398
 399                 data->fan_min[nr] = new_min;
 400
 401                 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
 402                                 nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
 403         }
 404
 405         if (new_div != data->fan_div[nr]) {
 406                 data->fan_div[nr] = new_div;
 407                 adm9240_write_fan_div(client, nr, new_div);
 408         }
 409         adm9240_write_value(client, ADM9240_REG_FAN_MIN(nr),
 410                         data->fan_min[nr]);
 411
 412         up(&data->update_lock);
 413         return count;
 414 }
 415
 416 #define show_fan_offset(offset)                                         \
 417 static ssize_t show_fan_##offset (struct device *dev,                   \
 418                                   struct device_attribute *attr,        \
 419                                   char *buf)                            \
 420 {                                                                       \
 421 return show_fan(dev, buf, offset - 1);                                  \
 422 }                                                                       \
 423 static ssize_t show_fan_##offset##_div (struct device *dev,             \
 424                                         struct device_attribute *attr,  \
 425                                         char *buf)                      \
 426 {                                                                       \
 427 return show_fan_div(dev, buf, offset - 1);                              \
 428 }                                                                       \
 429 static ssize_t show_fan_##offset##_min (struct device *dev,             \
 430                                         struct device_attribute *attr,  \
 431                                         char *buf)                      \
 432 {                                                                       \
 433 return show_fan_min(dev, buf, offset - 1);                              \
 434 }                                                                       \
 435 static ssize_t set_fan_##offset##_min (struct device *dev,              \
 436                                        struct device_attribute *attr,   \
 437                                        const char *buf, size_t count)   \
 438 {                                                                       \
 439 return set_fan_min(dev, buf, count, offset - 1);                        \
 440 }                                                                       \
 441 static DEVICE_ATTR(fan##offset##_input, S_IRUGO,                        \
 442                 show_fan_##offset, NULL);                               \
 443 static DEVICE_ATTR(fan##offset##_div, S_IRUGO,                          \
 444                 show_fan_##offset##_div, NULL);                         \
 445 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,                \
 446                 show_fan_##offset##_min, set_fan_##offset##_min);
 447
 448 show_fan_offset(1);
 449 show_fan_offset(2);
 450
 451 /* alarms */
 452 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 453 {
 454         struct adm9240_data *data = adm9240_update_device(dev);
 455         return sprintf(buf, "%u\n", data->alarms);
 456 }
 457 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 458
 459 /* vid */
 460 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 461 {
 462         struct adm9240_data *data = adm9240_update_device(dev);
 463         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 464 }
 465 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 466
 467 /* analog output */
 468 static ssize_t show_aout(struct device *dev, struct device_attribute *attr, char *buf)
 469 {
 470         struct adm9240_data *data = adm9240_update_device(dev);
 471         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 472 }
 473
 474 static ssize_t set_aout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 475 {
 476         struct i2c_client *client = to_i2c_client(dev);
 477         struct adm9240_data *data = i2c_get_clientdata(client);
 478         unsigned long val = simple_strtol(buf, NULL, 10);
 479
 480         down(&data->update_lock);
 481         data->aout = AOUT_TO_REG(val);
 482         adm9240_write_value(client, ADM9240_REG_ANALOG_OUT, data->aout);
 483         up(&data->update_lock);
 484         return count;
 485 }
 486 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
 487
 488 /* chassis_clear */
 489 static ssize_t chassis_clear(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 490 {
 491         struct i2c_client *client = to_i2c_client(dev);
 492         unsigned long val = simple_strtol(buf, NULL, 10);
 493
 494         if (val == 1) {
 495                 adm9240_write_value(client, ADM9240_REG_CHASSIS_CLEAR, 0x80);
 496                 dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
 497         }
 498         return count;
 499 }
 500 static DEVICE_ATTR(chassis_clear, S_IWUSR, NULL, chassis_clear);
 501
 502
 503 /*** sensor chip detect and driver install ***/
 504
 505 static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind)
 506 {
 507         struct i2c_client *new_client;
 508         struct adm9240_data *data;
 509         int err = 0;
 510         const char *name = "";
 511         u8 man_id, die_rev;
 512
 513         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 514                 goto exit;
 515
 516         if (!(data = kmalloc(sizeof(struct adm9240_data), GFP_KERNEL))) {
 517                 err = -ENOMEM;
 518                 goto exit;
 519         }
 520         memset(data, 0, sizeof(struct adm9240_data));
 521
 522         new_client = &data->client;
 523         i2c_set_clientdata(new_client, data);
 524         new_client->addr = address;
 525         new_client->adapter = adapter;
 526         new_client->driver = &adm9240_driver;
 527         new_client->flags = 0;
 528
 529         if (kind == 0) {
 530                 kind = adm9240;
 531         }
 532
 533         if (kind < 0) {
 534
 535                 /* verify chip: reg address should match i2c address */
 536                 if (adm9240_read_value(new_client, ADM9240_REG_I2C_ADDR)
 537                                 != address) {
 538                         dev_err(&adapter->dev, "detect fail: address match, "
 539                                         "0x%02x\n", address);
 540                         goto exit_free;
 541                 }
 542
 543                 /* check known chip manufacturer */
 544                 man_id = adm9240_read_value(new_client, ADM9240_REG_MAN_ID);
 545
 546                 if (man_id == 0x23) {
 547                         kind = adm9240;
 548                 } else if (man_id == 0xda) {
 549                         kind = ds1780;
 550                 } else if (man_id == 0x01) {
 551                         kind = lm81;
 552                 } else {
 553                         dev_err(&adapter->dev, "detect fail: unknown manuf, "
 554                                         "0x%02x\n", man_id);
 555                         goto exit_free;
 556                 }
 557
 558                 /* successful detect, print chip info */
 559                 die_rev = adm9240_read_value(new_client, ADM9240_REG_DIE_REV);
 560                 dev_info(&adapter->dev, "found %s revision %u\n",
 561                                 man_id == 0x23 ? "ADM9240" :
 562                                 man_id == 0xda ? "DS1780" : "LM81", die_rev);
 563         }
 564
 565         /* either forced or detected chip kind */
 566         if (kind == adm9240) {
 567                 name = "adm9240";
 568         } else if (kind == ds1780) {
 569                 name = "ds1780";
 570         } else if (kind == lm81) {
 571                 name = "lm81";
 572         }
 573
 574         /* fill in the remaining client fields and attach */
 575         strlcpy(new_client->name, name, I2C_NAME_SIZE);
 576         data->type = kind;
 577         init_MUTEX(&data->update_lock);
 578
 579         if ((err = i2c_attach_client(new_client)))
 580                 goto exit_free;
 581
 582         adm9240_init_client(new_client);
 583
 584         /* populate sysfs filesystem */
 585         data->class_dev = hwmon_device_register(&new_client->dev);
 586         if (IS_ERR(data->class_dev)) {
 587                 err = PTR_ERR(data->class_dev);
 588                 goto exit_detach;
 589         }
 590
 591         device_create_file(&new_client->dev, &dev_attr_in0_input);
 592         device_create_file(&new_client->dev, &dev_attr_in0_min);
 593         device_create_file(&new_client->dev, &dev_attr_in0_max);
 594         device_create_file(&new_client->dev, &dev_attr_in1_input);
 595         device_create_file(&new_client->dev, &dev_attr_in1_min);
 596         device_create_file(&new_client->dev, &dev_attr_in1_max);
 597         device_create_file(&new_client->dev, &dev_attr_in2_input);
 598         device_create_file(&new_client->dev, &dev_attr_in2_min);
 599         device_create_file(&new_client->dev, &dev_attr_in2_max);
 600         device_create_file(&new_client->dev, &dev_attr_in3_input);
 601         device_create_file(&new_client->dev, &dev_attr_in3_min);
 602         device_create_file(&new_client->dev, &dev_attr_in3_max);
 603         device_create_file(&new_client->dev, &dev_attr_in4_input);
 604         device_create_file(&new_client->dev, &dev_attr_in4_min);
 605         device_create_file(&new_client->dev, &dev_attr_in4_max);
 606         device_create_file(&new_client->dev, &dev_attr_in5_input);
 607         device_create_file(&new_client->dev, &dev_attr_in5_min);
 608         device_create_file(&new_client->dev, &dev_attr_in5_max);
 609         device_create_file(&new_client->dev, &dev_attr_temp1_max);
 610         device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
 611         device_create_file(&new_client->dev, &dev_attr_temp1_input);
 612         device_create_file(&new_client->dev, &dev_attr_fan1_input);
 613         device_create_file(&new_client->dev, &dev_attr_fan1_div);
 614         device_create_file(&new_client->dev, &dev_attr_fan1_min);
 615         device_create_file(&new_client->dev, &dev_attr_fan2_input);
 616         device_create_file(&new_client->dev, &dev_attr_fan2_div);
 617         device_create_file(&new_client->dev, &dev_attr_fan2_min);
 618         device_create_file(&new_client->dev, &dev_attr_alarms);
 619         device_create_file(&new_client->dev, &dev_attr_aout_output);
 620         device_create_file(&new_client->dev, &dev_attr_chassis_clear);
 621         device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
 622
 623         return 0;
 624
 625 exit_detach:
 626         i2c_detach_client(new_client);
 627 exit_free:
 628         kfree(data);
 629 exit:
 630         return err;
 631 }
 632
 633 static int adm9240_attach_adapter(struct i2c_adapter *adapter)
 634 {
 635         if (!(adapter->class & I2C_CLASS_HWMON))
 636                 return 0;
 637         return i2c_probe(adapter, &addr_data, adm9240_detect);
 638 }
 639
 640 static int adm9240_detach_client(struct i2c_client *client)
 641 {
 642         struct adm9240_data *data = i2c_get_clientdata(client);
 643         int err;
 644
 645         hwmon_device_unregister(data->class_dev);
 646
 647         if ((err = i2c_detach_client(client)))
 648                 return err;
 649
 650         kfree(data);
 651         return 0;
 652 }
 653
 654 static void adm9240_init_client(struct i2c_client *client)
 655 {
 656         struct adm9240_data *data = i2c_get_clientdata(client);
 657         u8 conf = adm9240_read_value(client, ADM9240_REG_CONFIG);
 658         u8 mode = adm9240_read_value(client, ADM9240_REG_TEMP_CONF) & 3;
 659
 660         data->vrm = vid_which_vrm(); /* need this to report vid as mV */
 661
 662         dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10,
 663                         data->vrm % 10);
 664
 665         if (conf & 1) { /* measurement cycle running: report state */
 666
 667                 dev_info(&client->dev, "status: config 0x%02x mode %u\n",
 668                                 conf, mode);
 669
 670         } else { /* cold start: open limits before starting chip */
 671                 int i;
 672
 673                 for (i = 0; i < 6; i++)
 674                 {
 675                         adm9240_write_value(client,
 676                                         ADM9240_REG_IN_MIN(i), 0);
 677                         adm9240_write_value(client,
 678                                         ADM9240_REG_IN_MAX(i), 255);
 679                 }
 680                 adm9240_write_value(client, ADM9240_REG_FAN_MIN(0), 255);
 681                 adm9240_write_value(client, ADM9240_REG_FAN_MIN(1), 255);
 682                 adm9240_write_value(client, ADM9240_REG_TEMP_HIGH, 127);
 683                 adm9240_write_value(client, ADM9240_REG_TEMP_HYST, 127);
 684
 685                 /* start measurement cycle */
 686                 adm9240_write_value(client, ADM9240_REG_CONFIG, 1);
 687
 688                 dev_info(&client->dev, "cold start: config was 0x%02x "
 689                                 "mode %u\n", conf, mode);
 690         }
 691 }
 692
 693 static struct adm9240_data *adm9240_update_device(struct device *dev)
 694 {
 695         struct i2c_client *client = to_i2c_client(dev);
 696         struct adm9240_data *data = i2c_get_clientdata(client);
 697         int i;
 698
 699         down(&data->update_lock);
 700
 701         /* minimum measurement cycle: 1.75 seconds */
 702         if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
 703                         || !data->valid) {
 704
 705                 for (i = 0; i < 6; i++) /* read voltages */
 706                 {
 707                         data->in[i] = adm9240_read_value(client,
 708                                         ADM9240_REG_IN(i));
 709                 }
 710                 data->alarms = adm9240_read_value(client,
 711                                         ADM9240_REG_INT(0)) |
 712                                         adm9240_read_value(client,
 713                                         ADM9240_REG_INT(1)) << 8;
 714
 715                 /* read temperature: assume temperature changes less than
 716                  * 0.5'C per two measurement cycles thus ignore possible
 717                  * but unlikely aliasing error on lsb reading. --Grant */
 718                 data->temp = ((adm9240_read_value(client,
 719                                         ADM9240_REG_TEMP) << 8) |
 720                                         adm9240_read_value(client,
 721                                         ADM9240_REG_TEMP_CONF)) / 128;
 722
 723                 for (i = 0; i < 2; i++) /* read fans */
 724                 {
 725                         data->fan[i] = adm9240_read_value(client,
 726                                         ADM9240_REG_FAN(i));
 727
 728                         /* adjust fan clock divider on overflow */
 729                         if (data->valid && data->fan[i] == 255 &&
 730                                         data->fan_div[i] < 3) {
 731
 732                                 adm9240_write_fan_div(client, i,
 733                                                 ++data->fan_div[i]);
 734
 735                                 /* adjust fan_min if active, but not to 0 */
 736                                 if (data->fan_min[i] < 255 &&
 737                                                 data->fan_min[i] >= 2)
 738                                         data->fan_min[i] /= 2;
 739                         }
 740                 }
 741                 data->last_updated_measure = jiffies;
 742         }
 743
 744         /* minimum config reading cycle: 300 seconds */
 745         if (time_after(jiffies, data->last_updated_config + (HZ * 300))
 746                         || !data->valid) {
 747
 748                 for (i = 0; i < 6; i++)
 749                 {
 750                         data->in_min[i] = adm9240_read_value(client,
 751                                         ADM9240_REG_IN_MIN(i));
 752                         data->in_max[i] = adm9240_read_value(client,
 753                                         ADM9240_REG_IN_MAX(i));
 754                 }
 755                 for (i = 0; i < 2; i++)
 756                 {
 757                         data->fan_min[i] = adm9240_read_value(client,
 758                                         ADM9240_REG_FAN_MIN(i));
 759                 }
 760                 data->temp_high = adm9240_read_value(client,
 761                                 ADM9240_REG_TEMP_HIGH);
 762                 data->temp_hyst = adm9240_read_value(client,
 763                                 ADM9240_REG_TEMP_HYST);
 764
 765                 /* read fan divs and 5-bit VID */
 766                 i = adm9240_read_value(client, ADM9240_REG_VID_FAN_DIV);
 767                 data->fan_div[0] = (i >> 4) & 3;
 768                 data->fan_div[1] = (i >> 6) & 3;
 769                 data->vid = i & 0x0f;
 770                 data->vid |= (adm9240_read_value(client,
 771                                         ADM9240_REG_VID4) & 1) << 4;
 772                 /* read analog out */
 773                 data->aout = adm9240_read_value(client,
 774                                 ADM9240_REG_ANALOG_OUT);
 775
 776                 data->last_updated_config = jiffies;
 777                 data->valid = 1;
 778         }
 779         up(&data->update_lock);
 780         return data;
 781 }
 782
 783 static int __init sensors_adm9240_init(void)
 784 {
 785         return i2c_add_driver(&adm9240_driver);
 786 }
 787
 788 static void __exit sensors_adm9240_exit(void)
 789 {
 790         i2c_del_driver(&adm9240_driver);
 791 }
 792
 793 MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
 794                 "Grant Coady <gcoady@gmail.com> and others");
 795 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
 796 MODULE_LICENSE("GPL");
 797
 798 module_init(sensors_adm9240_init);
 799 module_exit(sensors_adm9240_exit);
 800