err.no 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/i2c-sensor.h>
  49 #include <linux/i2c-vid.h>
  50 #include <linux/hwmon.h>
  51 #include <linux/err.h>
  52
  53 /* Addresses to scan */
  54 static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
  55                                         I2C_CLIENT_END };
  56
  57 /* Insmod parameters */
  58 SENSORS_INSMOD_3(adm9240, ds1780, lm81);
  59
  60 /* ADM9240 registers */
  61 #define ADM9240_REG_MAN_ID              0x3e
  62 #define ADM9240_REG_DIE_REV             0x3f
  63 #define ADM9240_REG_CONFIG              0x40
  64
  65 #define ADM9240_REG_IN(nr)              (0x20 + (nr))   /* 0..5 */
  66 #define ADM9240_REG_IN_MAX(nr)          (0x2b + (nr) * 2)
  67 #define ADM9240_REG_IN_MIN(nr)          (0x2c + (nr) * 2)
  68 #define ADM9240_REG_FAN(nr)             (0x28 + (nr))   /* 0..1 */
  69 #define ADM9240_REG_FAN_MIN(nr)         (0x3b + (nr))
  70 #define ADM9240_REG_INT(nr)             (0x41 + (nr))
  71 #define ADM9240_REG_INT_MASK(nr)        (0x43 + (nr))
  72 #define ADM9240_REG_TEMP                0x27
  73 #define ADM9240_REG_TEMP_HIGH           0x39
  74 #define ADM9240_REG_TEMP_HYST           0x3a
  75 #define ADM9240_REG_ANALOG_OUT          0x19
  76 #define ADM9240_REG_CHASSIS_CLEAR       0x46
  77 #define ADM9240_REG_VID_FAN_DIV         0x47
  78 #define ADM9240_REG_I2C_ADDR            0x48
  79 #define ADM9240_REG_VID4                0x49
  80 #define ADM9240_REG_TEMP_CONF           0x4b
  81
  82 /* generalised scaling with integer rounding */
  83 static inline int SCALE(long val, int mul, int div)
  84 {
  85         if (val < 0)
  86                 return (val * mul - div / 2) / div;
  87         else
  88                 return (val * mul + div / 2) / div;
  89 }
  90
  91 /* adm9240 internally scales voltage measurements */
  92 static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
  93
  94 static inline unsigned int IN_FROM_REG(u8 reg, int n)
  95 {
  96         return SCALE(reg, nom_mv[n], 192);
  97 }
  98
  99 static inline u8 IN_TO_REG(unsigned long val, int n)
 100 {
 101         return SENSORS_LIMIT(SCALE(val, 192, nom_mv[n]), 0, 255);
 102 }
 103
 104 /* temperature range: -40..125, 127 disables temperature alarm */
 105 static inline s8 TEMP_TO_REG(long val)
 106 {
 107         return SENSORS_LIMIT(SCALE(val, 1, 1000), -40, 127);
 108 }
 109
 110 /* two fans, each with low fan speed limit */
 111 static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
 112 {
 113         if (!reg) /* error */
 114                 return -1;
 115
 116         if (reg == 255)
 117                 return 0;
 118
 119         return SCALE(1350000, 1, reg * div);
 120 }
 121
 122 /* analog out 0..1250mV */
 123 static inline u8 AOUT_TO_REG(unsigned long val)
 124 {
 125         return SENSORS_LIMIT(SCALE(val, 255, 1250), 0, 255);
 126 }
 127
 128 static inline unsigned int AOUT_FROM_REG(u8 reg)
 129 {
 130         return SCALE(reg, 1250, 255);
 131 }
 132
 133 static int adm9240_attach_adapter(struct i2c_adapter *adapter);
 134 static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind);
 135 static void adm9240_init_client(struct i2c_client *client);
 136 static int adm9240_detach_client(struct i2c_client *client);
 137 static struct adm9240_data *adm9240_update_device(struct device *dev);
 138
 139 /* driver data */
 140 static struct i2c_driver adm9240_driver = {
 141         .owner          = THIS_MODULE,
 142         .name           = "adm9240",
 143         .id             = I2C_DRIVERID_ADM9240,
 144         .flags          = I2C_DF_NOTIFY,
 145         .attach_adapter = adm9240_attach_adapter,
 146         .detach_client  = adm9240_detach_client,
 147 };
 148
 149 /* per client data */
 150 struct adm9240_data {
 151         enum chips type;
 152         struct i2c_client client;
 153         struct class_device *class_dev;
 154         struct semaphore update_lock;
 155         char valid;
 156         unsigned long last_updated_measure;
 157         unsigned long last_updated_config;
 158
 159         u8 in[6];               /* ro   in0_input */
 160         u8 in_max[6];           /* rw   in0_max */
 161         u8 in_min[6];           /* rw   in0_min */
 162         u8 fan[2];              /* ro   fan1_input */
 163         u8 fan_min[2];          /* rw   fan1_min */
 164         u8 fan_div[2];          /* rw   fan1_div, read-only accessor */
 165         s16 temp;               /* ro   temp1_input, 9-bit sign-extended */
 166         s8 temp_high;           /* rw   temp1_max */
 167         s8 temp_hyst;           /* rw   temp1_max_hyst */
 168         u16 alarms;             /* ro   alarms */
 169         u8 aout;                /* rw   aout_output */
 170         u8 vid;                 /* ro   vid */
 171         u8 vrm;                 /* --   vrm set on startup, no accessor */
 172 };
 173
 174 /* i2c byte read/write interface */
 175 static int adm9240_read_value(struct i2c_client *client, u8 reg)
 176 {
 177         return i2c_smbus_read_byte_data(client, reg);
 178 }
 179
 180 static int adm9240_write_value(struct i2c_client *client, u8 reg, u8 value)
 181 {
 182         return i2c_smbus_write_byte_data(client, reg, value);
 183 }
 184
 185 /*** sysfs accessors ***/
 186
 187 /* temperature */
 188 #define show_temp(value, scale)                                 \
 189 static ssize_t show_##value(struct device *dev,                 \
 190                             struct device_attribute *attr,      \
 191                             char *buf)                          \
 192 {                                                               \
 193         struct adm9240_data *data = adm9240_update_device(dev); \
 194         return sprintf(buf, "%d\n", data->value * scale);       \
 195 }
 196 show_temp(temp_high, 1000);
 197 show_temp(temp_hyst, 1000);
 198 show_temp(temp, 500); /* 0.5'C per bit */
 199
 200 #define set_temp(value, reg)                                    \
 201 static ssize_t set_##value(struct device *dev,                  \
 202                            struct device_attribute *attr,       \
 203                            const char *buf, size_t count)       \
 204 {                                                               \
 205         struct i2c_client *client = to_i2c_client(dev);         \
 206         struct adm9240_data *data = adm9240_update_device(dev); \
 207         long temp = simple_strtoul(buf, NULL, 10);              \
 208                                                                 \
 209         down(&data->update_lock);                               \
 210         data->value = TEMP_TO_REG(temp);                        \
 211         adm9240_write_value(client, reg, data->value);          \
 212         up(&data->update_lock);                                 \
 213         return count;                                           \
 214 }
 215
 216 set_temp(temp_high, ADM9240_REG_TEMP_HIGH);
 217 set_temp(temp_hyst, ADM9240_REG_TEMP_HYST);
 218
 219 static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
 220                 show_temp_high, set_temp_high);
 221 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
 222                 show_temp_hyst, set_temp_hyst);
 223 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
 224
 225 /* voltage */
 226 static ssize_t show_in(struct device *dev, char *buf, int nr)
 227 {
 228         struct adm9240_data *data = adm9240_update_device(dev);
 229         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
 230 }
 231
 232 static ssize_t show_in_min(struct device *dev, char *buf, int nr)
 233 {
 234         struct adm9240_data *data = adm9240_update_device(dev);
 235         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
 236 }
 237
 238 static ssize_t show_in_max(struct device *dev, char *buf, int nr)
 239 {
 240         struct adm9240_data *data = adm9240_update_device(dev);
 241         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));
 242 }
 243
 244 static ssize_t set_in_min(struct device *dev, const char *buf,
 245                 size_t count, int nr)
 246 {
 247         struct i2c_client *client = to_i2c_client(dev);
 248         struct adm9240_data *data = i2c_get_clientdata(client);
 249         unsigned long val = simple_strtoul(buf, NULL, 10);
 250
 251         down(&data->update_lock);
 252         data->in_min[nr] = IN_TO_REG(val, nr);
 253         adm9240_write_value(client, ADM9240_REG_IN_MIN(nr), data->in_min[nr]);
 254         up(&data->update_lock);
 255         return count;
 256 }
 257
 258 static ssize_t set_in_max(struct device *dev, const char *buf,
 259                 size_t count, int nr)
 260 {
 261         struct i2c_client *client = to_i2c_client(dev);
 262         struct adm9240_data *data = i2c_get_clientdata(client);
 263         unsigned long val = simple_strtoul(buf, NULL, 10);
 264
 265         down(&data->update_lock);
 266         data->in_max[nr] = IN_TO_REG(val, nr);
 267         adm9240_write_value(client, ADM9240_REG_IN_MAX(nr), data->in_max[nr]);
 268         up(&data->update_lock);
 269         return count;
 270 }
 271
 272 #define show_in_offset(offset)                                          \
 273 static ssize_t show_in##offset(struct device *dev,                      \
 274                                struct device_attribute *attr,           \
 275                                char *buf)                               \
 276 {                                                                       \
 277         return show_in(dev, buf, offset);                               \
 278 }                                                                       \
 279 static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL); \
 280 static ssize_t show_in##offset##_min(struct device *dev,                \
 281                                      struct device_attribute *attr,     \
 282                                      char *buf)                         \
 283 {                                                                       \
 284         return show_in_min(dev, buf, offset);                           \
 285 }                                                                       \
 286 static ssize_t show_in##offset##_max(struct device *dev,                \
 287                                      struct device_attribute *attr,     \
 288                                      char *buf)                         \
 289 {                                                                       \
 290         return show_in_max(dev, buf, offset);                           \
 291 }                                                                       \
 292 static ssize_t                                                          \
 293 set_in##offset##_min(struct device *dev,                                \
 294                      struct device_attribute *attr, const char *buf,    \
 295                      size_t count)                                      \
 296 {                                                                       \
 297         return set_in_min(dev, buf, count, offset);                     \
 298 }                                                                       \
 299 static ssize_t                                                          \
 300 set_in##offset##_max(struct device *dev,                                \
 301                      struct device_attribute *attr, const char *buf,    \
 302                      size_t count)                                      \
 303 {                                                                       \
 304         return set_in_max(dev, buf, count, offset);                     \
 305 }                                                                       \
 306 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,                 \
 307                 show_in##offset##_min, set_in##offset##_min);           \
 308 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,                 \
 309                 show_in##offset##_max, set_in##offset##_max);
 310
 311 show_in_offset(0);
 312 show_in_offset(1);
 313 show_in_offset(2);
 314 show_in_offset(3);
 315 show_in_offset(4);
 316 show_in_offset(5);
 317
 318 /* fans */
 319 static ssize_t show_fan(struct device *dev, char *buf, int nr)
 320 {
 321         struct adm9240_data *data = adm9240_update_device(dev);
 322         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 323                                 1 << data->fan_div[nr]));
 324 }
 325
 326 static ssize_t show_fan_min(struct device *dev, char *buf, int nr)
 327 {
 328         struct adm9240_data *data = adm9240_update_device(dev);
 329         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 330                                 1 << data->fan_div[nr]));
 331 }
 332
 333 static ssize_t show_fan_div(struct device *dev, char *buf, int nr)
 334 {
 335         struct adm9240_data *data = adm9240_update_device(dev);
 336         return sprintf(buf, "%d\n", 1 << data->fan_div[nr]);
 337 }
 338
 339 /* write new fan div, callers must hold data->update_lock */
 340 static void adm9240_write_fan_div(struct i2c_client *client, int nr,
 341                 u8 fan_div)
 342 {
 343         u8 reg, old, shift = (nr + 2) * 2;
 344
 345         reg = adm9240_read_value(client, ADM9240_REG_VID_FAN_DIV);
 346         old = (reg >> shift) & 3;
 347         reg &= ~(3 << shift);
 348         reg |= (fan_div << shift);
 349         adm9240_write_value(client, ADM9240_REG_VID_FAN_DIV, reg);
 350         dev_dbg(&client->dev, "fan%d clock divider changed from %u "
 351                         "to %u\n", nr + 1, 1 << old, 1 << fan_div);
 352 }
 353
 354 /*
 355  * set fan speed low limit:
 356  *
 357  * - value is zero: disable fan speed low limit alarm
 358  *
 359  * - value is below fan speed measurement range: enable fan speed low
 360  *   limit alarm to be asserted while fan speed too slow to measure
 361  *
 362  * - otherwise: select fan clock divider to suit fan speed low limit,
 363  *   measurement code may adjust registers to ensure fan speed reading
 364  */
 365 static ssize_t set_fan_min(struct device *dev, const char *buf,
 366                 size_t count, int nr)
 367 {
 368         struct i2c_client *client = to_i2c_client(dev);
 369         struct adm9240_data *data = i2c_get_clientdata(client);
 370         unsigned long val = simple_strtoul(buf, NULL, 10);
 371         u8 new_div;
 372
 373         down(&data->update_lock);
 374
 375         if (!val) {
 376                 data->fan_min[nr] = 255;
 377                 new_div = data->fan_div[nr];
 378
 379                 dev_dbg(&client->dev, "fan%u low limit set disabled\n",
 380                                 nr + 1);
 381
 382         } else if (val < 1350000 / (8 * 254)) {
 383                 new_div = 3;
 384                 data->fan_min[nr] = 254;
 385
 386                 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
 387                                 nr + 1, FAN_FROM_REG(254, 1 << new_div));
 388
 389         } else {
 390                 unsigned int new_min = 1350000 / val;
 391
 392                 new_div = 0;
 393                 while (new_min > 192 && new_div < 3) {
 394                         new_div++;
 395                         new_min /= 2;
 396                 }
 397                 if (!new_min) /* keep > 0 */
 398                         new_min++;
 399
 400                 data->fan_min[nr] = new_min;
 401
 402                 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
 403                                 nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
 404         }
 405
 406         if (new_div != data->fan_div[nr]) {
 407                 data->fan_div[nr] = new_div;
 408                 adm9240_write_fan_div(client, nr, new_div);
 409         }
 410         adm9240_write_value(client, ADM9240_REG_FAN_MIN(nr),
 411                         data->fan_min[nr]);
 412
 413         up(&data->update_lock);
 414         return count;
 415 }
 416
 417 #define show_fan_offset(offset)                                         \
 418 static ssize_t show_fan_##offset (struct device *dev,                   \
 419                                   struct device_attribute *attr,        \
 420                                   char *buf)                            \
 421 {                                                                       \
 422 return show_fan(dev, buf, offset - 1);                                  \
 423 }                                                                       \
 424 static ssize_t show_fan_##offset##_div (struct device *dev,             \
 425                                         struct device_attribute *attr,  \
 426                                         char *buf)                      \
 427 {                                                                       \
 428 return show_fan_div(dev, buf, offset - 1);                              \
 429 }                                                                       \
 430 static ssize_t show_fan_##offset##_min (struct device *dev,             \
 431                                         struct device_attribute *attr,  \
 432                                         char *buf)                      \
 433 {                                                                       \
 434 return show_fan_min(dev, buf, offset - 1);                              \
 435 }                                                                       \
 436 static ssize_t set_fan_##offset##_min (struct device *dev,              \
 437                                        struct device_attribute *attr,   \
 438                                        const char *buf, size_t count)   \
 439 {                                                                       \
 440 return set_fan_min(dev, buf, count, offset - 1);                        \
 441 }                                                                       \
 442 static DEVICE_ATTR(fan##offset##_input, S_IRUGO,                        \
 443                 show_fan_##offset, NULL);                               \
 444 static DEVICE_ATTR(fan##offset##_div, S_IRUGO,                          \
 445                 show_fan_##offset##_div, NULL);                         \
 446 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,                \
 447                 show_fan_##offset##_min, set_fan_##offset##_min);
 448
 449 show_fan_offset(1);
 450 show_fan_offset(2);
 451
 452 /* alarms */
 453 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 454 {
 455         struct adm9240_data *data = adm9240_update_device(dev);
 456         return sprintf(buf, "%u\n", data->alarms);
 457 }
 458 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 459
 460 /* vid */
 461 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 462 {
 463         struct adm9240_data *data = adm9240_update_device(dev);
 464         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 465 }
 466 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 467
 468 /* analog output */
 469 static ssize_t show_aout(struct device *dev, struct device_attribute *attr, char *buf)
 470 {
 471         struct adm9240_data *data = adm9240_update_device(dev);
 472         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 473 }
 474
 475 static ssize_t set_aout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 476 {
 477         struct i2c_client *client = to_i2c_client(dev);
 478         struct adm9240_data *data = i2c_get_clientdata(client);
 479         unsigned long val = simple_strtol(buf, NULL, 10);
 480
 481         down(&data->update_lock);
 482         data->aout = AOUT_TO_REG(val);
 483         adm9240_write_value(client, ADM9240_REG_ANALOG_OUT, data->aout);
 484         up(&data->update_lock);
 485         return count;
 486 }
 487 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
 488
 489 /* chassis_clear */
 490 static ssize_t chassis_clear(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 491 {
 492         struct i2c_client *client = to_i2c_client(dev);
 493         unsigned long val = simple_strtol(buf, NULL, 10);
 494
 495         if (val == 1) {
 496                 adm9240_write_value(client, ADM9240_REG_CHASSIS_CLEAR, 0x80);
 497                 dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
 498         }
 499         return count;
 500 }
 501 static DEVICE_ATTR(chassis_clear, S_IWUSR, NULL, chassis_clear);
 502
 503
 504 /*** sensor chip detect and driver install ***/
 505
 506 static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind)
 507 {
 508         struct i2c_client *new_client;
 509         struct adm9240_data *data;
 510         int err = 0;
 511         const char *name = "";
 512         u8 man_id, die_rev;
 513
 514         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 515                 goto exit;
 516
 517         if (!(data = kmalloc(sizeof(struct adm9240_data), GFP_KERNEL))) {
 518                 err = -ENOMEM;
 519                 goto exit;
 520         }
 521         memset(data, 0, sizeof(struct adm9240_data));
 522
 523         new_client = &data->client;
 524         i2c_set_clientdata(new_client, data);
 525         new_client->addr = address;
 526         new_client->adapter = adapter;
 527         new_client->driver = &adm9240_driver;
 528         new_client->flags = 0;
 529
 530         if (kind == 0) {
 531                 kind = adm9240;
 532         }
 533
 534         if (kind < 0) {
 535
 536                 /* verify chip: reg address should match i2c address */
 537                 if (adm9240_read_value(new_client, ADM9240_REG_I2C_ADDR)
 538                                 != address) {
 539                         dev_err(&adapter->dev, "detect fail: address match, "
 540                                         "0x%02x\n", address);
 541                         goto exit_free;
 542                 }
 543
 544                 /* check known chip manufacturer */
 545                 man_id = adm9240_read_value(new_client, ADM9240_REG_MAN_ID);
 546
 547                 if (man_id == 0x23) {
 548                         kind = adm9240;
 549                 } else if (man_id == 0xda) {
 550                         kind = ds1780;
 551                 } else if (man_id == 0x01) {
 552                         kind = lm81;
 553                 } else {
 554                         dev_err(&adapter->dev, "detect fail: unknown manuf, "
 555                                         "0x%02x\n", man_id);
 556                         goto exit_free;
 557                 }
 558
 559                 /* successful detect, print chip info */
 560                 die_rev = adm9240_read_value(new_client, ADM9240_REG_DIE_REV);
 561                 dev_info(&adapter->dev, "found %s revision %u\n",
 562                                 man_id == 0x23 ? "ADM9240" :
 563                                 man_id == 0xda ? "DS1780" : "LM81", die_rev);
 564         }
 565
 566         /* either forced or detected chip kind */
 567         if (kind == adm9240) {
 568                 name = "adm9240";
 569         } else if (kind == ds1780) {
 570                 name = "ds1780";
 571         } else if (kind == lm81) {
 572                 name = "lm81";
 573         }
 574
 575         /* fill in the remaining client fields and attach */
 576         strlcpy(new_client->name, name, I2C_NAME_SIZE);
 577         data->type = kind;
 578         init_MUTEX(&data->update_lock);
 579
 580         if ((err = i2c_attach_client(new_client)))
 581                 goto exit_free;
 582
 583         adm9240_init_client(new_client);
 584
 585         /* populate sysfs filesystem */
 586         data->class_dev = hwmon_device_register(&new_client->dev);
 587         if (IS_ERR(data->class_dev)) {
 588                 err = PTR_ERR(data->class_dev);
 589                 goto exit_detach;
 590         }
 591
 592         device_create_file(&new_client->dev, &dev_attr_in0_input);
 593         device_create_file(&new_client->dev, &dev_attr_in0_min);
 594         device_create_file(&new_client->dev, &dev_attr_in0_max);
 595         device_create_file(&new_client->dev, &dev_attr_in1_input);
 596         device_create_file(&new_client->dev, &dev_attr_in1_min);
 597         device_create_file(&new_client->dev, &dev_attr_in1_max);
 598         device_create_file(&new_client->dev, &dev_attr_in2_input);
 599         device_create_file(&new_client->dev, &dev_attr_in2_min);
 600         device_create_file(&new_client->dev, &dev_attr_in2_max);
 601         device_create_file(&new_client->dev, &dev_attr_in3_input);
 602         device_create_file(&new_client->dev, &dev_attr_in3_min);
 603         device_create_file(&new_client->dev, &dev_attr_in3_max);
 604         device_create_file(&new_client->dev, &dev_attr_in4_input);
 605         device_create_file(&new_client->dev, &dev_attr_in4_min);
 606         device_create_file(&new_client->dev, &dev_attr_in4_max);
 607         device_create_file(&new_client->dev, &dev_attr_in5_input);
 608         device_create_file(&new_client->dev, &dev_attr_in5_min);
 609         device_create_file(&new_client->dev, &dev_attr_in5_max);
 610         device_create_file(&new_client->dev, &dev_attr_temp1_max);
 611         device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
 612         device_create_file(&new_client->dev, &dev_attr_temp1_input);
 613         device_create_file(&new_client->dev, &dev_attr_fan1_input);
 614         device_create_file(&new_client->dev, &dev_attr_fan1_div);
 615         device_create_file(&new_client->dev, &dev_attr_fan1_min);
 616         device_create_file(&new_client->dev, &dev_attr_fan2_input);
 617         device_create_file(&new_client->dev, &dev_attr_fan2_div);
 618         device_create_file(&new_client->dev, &dev_attr_fan2_min);
 619         device_create_file(&new_client->dev, &dev_attr_alarms);
 620         device_create_file(&new_client->dev, &dev_attr_aout_output);
 621         device_create_file(&new_client->dev, &dev_attr_chassis_clear);
 622         device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
 623
 624         return 0;
 625
 626 exit_detach:
 627         i2c_detach_client(new_client);
 628 exit_free:
 629         kfree(data);
 630 exit:
 631         return err;
 632 }
 633
 634 static int adm9240_attach_adapter(struct i2c_adapter *adapter)
 635 {
 636         if (!(adapter->class & I2C_CLASS_HWMON))
 637                 return 0;
 638         return i2c_detect(adapter, &addr_data, adm9240_detect);
 639 }
 640
 641 static int adm9240_detach_client(struct i2c_client *client)
 642 {
 643         struct adm9240_data *data = i2c_get_clientdata(client);
 644         int err;
 645
 646         hwmon_device_unregister(data->class_dev);
 647
 648         if ((err = i2c_detach_client(client)))
 649                 return err;
 650
 651         kfree(data);
 652         return 0;
 653 }
 654
 655 static void adm9240_init_client(struct i2c_client *client)
 656 {
 657         struct adm9240_data *data = i2c_get_clientdata(client);
 658         u8 conf = adm9240_read_value(client, ADM9240_REG_CONFIG);
 659         u8 mode = adm9240_read_value(client, ADM9240_REG_TEMP_CONF) & 3;
 660
 661         data->vrm = i2c_which_vrm(); /* need this to report vid as mV */
 662
 663         dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10,
 664                         data->vrm % 10);
 665
 666         if (conf & 1) { /* measurement cycle running: report state */
 667
 668                 dev_info(&client->dev, "status: config 0x%02x mode %u\n",
 669                                 conf, mode);
 670
 671         } else { /* cold start: open limits before starting chip */
 672                 int i;
 673
 674                 for (i = 0; i < 6; i++)
 675                 {
 676                         adm9240_write_value(client,
 677                                         ADM9240_REG_IN_MIN(i), 0);
 678                         adm9240_write_value(client,
 679                                         ADM9240_REG_IN_MAX(i), 255);
 680                 }
 681                 adm9240_write_value(client, ADM9240_REG_FAN_MIN(0), 255);
 682                 adm9240_write_value(client, ADM9240_REG_FAN_MIN(1), 255);
 683                 adm9240_write_value(client, ADM9240_REG_TEMP_HIGH, 127);
 684                 adm9240_write_value(client, ADM9240_REG_TEMP_HYST, 127);
 685
 686                 /* start measurement cycle */
 687                 adm9240_write_value(client, ADM9240_REG_CONFIG, 1);
 688
 689                 dev_info(&client->dev, "cold start: config was 0x%02x "
 690                                 "mode %u\n", conf, mode);
 691         }
 692 }
 693
 694 static struct adm9240_data *adm9240_update_device(struct device *dev)
 695 {
 696         struct i2c_client *client = to_i2c_client(dev);
 697         struct adm9240_data *data = i2c_get_clientdata(client);
 698         int i;
 699
 700         down(&data->update_lock);
 701
 702         /* minimum measurement cycle: 1.75 seconds */
 703         if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
 704                         || !data->valid) {
 705
 706                 for (i = 0; i < 6; i++) /* read voltages */
 707                 {
 708                         data->in[i] = adm9240_read_value(client,
 709                                         ADM9240_REG_IN(i));
 710                 }
 711                 data->alarms = adm9240_read_value(client,
 712                                         ADM9240_REG_INT(0)) |
 713                                         adm9240_read_value(client,
 714                                         ADM9240_REG_INT(1)) << 8;
 715
 716                 /* read temperature: assume temperature changes less than
 717                  * 0.5'C per two measurement cycles thus ignore possible
 718                  * but unlikely aliasing error on lsb reading. --Grant */
 719                 data->temp = ((adm9240_read_value(client,
 720                                         ADM9240_REG_TEMP) << 8) |
 721                                         adm9240_read_value(client,
 722                                         ADM9240_REG_TEMP_CONF)) / 128;
 723
 724                 for (i = 0; i < 2; i++) /* read fans */
 725                 {
 726                         data->fan[i] = adm9240_read_value(client,
 727                                         ADM9240_REG_FAN(i));
 728
 729                         /* adjust fan clock divider on overflow */
 730                         if (data->valid && data->fan[i] == 255 &&
 731                                         data->fan_div[i] < 3) {
 732
 733                                 adm9240_write_fan_div(client, i,
 734                                                 ++data->fan_div[i]);
 735
 736                                 /* adjust fan_min if active, but not to 0 */
 737                                 if (data->fan_min[i] < 255 &&
 738                                                 data->fan_min[i] >= 2)
 739                                         data->fan_min[i] /= 2;
 740                         }
 741                 }
 742                 data->last_updated_measure = jiffies;
 743         }
 744
 745         /* minimum config reading cycle: 300 seconds */
 746         if (time_after(jiffies, data->last_updated_config + (HZ * 300))
 747                         || !data->valid) {
 748
 749                 for (i = 0; i < 6; i++)
 750                 {
 751                         data->in_min[i] = adm9240_read_value(client,
 752                                         ADM9240_REG_IN_MIN(i));
 753                         data->in_max[i] = adm9240_read_value(client,
 754                                         ADM9240_REG_IN_MAX(i));
 755                 }
 756                 for (i = 0; i < 2; i++)
 757                 {
 758                         data->fan_min[i] = adm9240_read_value(client,
 759                                         ADM9240_REG_FAN_MIN(i));
 760                 }
 761                 data->temp_high = adm9240_read_value(client,
 762                                 ADM9240_REG_TEMP_HIGH);
 763                 data->temp_hyst = adm9240_read_value(client,
 764                                 ADM9240_REG_TEMP_HYST);
 765
 766                 /* read fan divs and 5-bit VID */
 767                 i = adm9240_read_value(client, ADM9240_REG_VID_FAN_DIV);
 768                 data->fan_div[0] = (i >> 4) & 3;
 769                 data->fan_div[1] = (i >> 6) & 3;
 770                 data->vid = i & 0x0f;
 771                 data->vid |= (adm9240_read_value(client,
 772                                         ADM9240_REG_VID4) & 1) << 4;
 773                 /* read analog out */
 774                 data->aout = adm9240_read_value(client,
 775                                 ADM9240_REG_ANALOG_OUT);
 776
 777                 data->last_updated_config = jiffies;
 778                 data->valid = 1;
 779         }
 780         up(&data->update_lock);
 781         return data;
 782 }
 783
 784 static int __init sensors_adm9240_init(void)
 785 {
 786         return i2c_add_driver(&adm9240_driver);
 787 }
 788
 789 static void __exit sensors_adm9240_exit(void)
 790 {
 791         i2c_del_driver(&adm9240_driver);
 792 }
 793
 794 MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
 795                 "Grant Coady <gcoady@gmail.com> and others");
 796 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
 797 MODULE_LICENSE("GPL");
 798
 799 module_init(sensors_adm9240_init);
 800 module_exit(sensors_adm9240_exit);
 801