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   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 static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
  58
  59 /* Insmod parameters */
  60 SENSORS_INSMOD_3(adm9240, ds1780, lm81);
  61
  62 /* ADM9240 registers */
  63 #define ADM9240_REG_MAN_ID              0x3e
  64 #define ADM9240_REG_DIE_REV             0x3f
  65 #define ADM9240_REG_CONFIG              0x40
  66
  67 #define ADM9240_REG_IN(nr)              (0x20 + (nr))   /* 0..5 */
  68 #define ADM9240_REG_IN_MAX(nr)          (0x2b + (nr) * 2)
  69 #define ADM9240_REG_IN_MIN(nr)          (0x2c + (nr) * 2)
  70 #define ADM9240_REG_FAN(nr)             (0x28 + (nr))   /* 0..1 */
  71 #define ADM9240_REG_FAN_MIN(nr)         (0x3b + (nr))
  72 #define ADM9240_REG_INT(nr)             (0x41 + (nr))
  73 #define ADM9240_REG_INT_MASK(nr)        (0x43 + (nr))
  74 #define ADM9240_REG_TEMP                0x27
  75 #define ADM9240_REG_TEMP_HIGH           0x39
  76 #define ADM9240_REG_TEMP_HYST           0x3a
  77 #define ADM9240_REG_ANALOG_OUT          0x19
  78 #define ADM9240_REG_CHASSIS_CLEAR       0x46
  79 #define ADM9240_REG_VID_FAN_DIV         0x47
  80 #define ADM9240_REG_I2C_ADDR            0x48
  81 #define ADM9240_REG_VID4                0x49
  82 #define ADM9240_REG_TEMP_CONF           0x4b
  83
  84 /* generalised scaling with integer rounding */
  85 static inline int SCALE(long val, int mul, int div)
  86 {
  87         if (val < 0)
  88                 return (val * mul - div / 2) / div;
  89         else
  90                 return (val * mul + div / 2) / div;
  91 }
  92
  93 /* adm9240 internally scales voltage measurements */
  94 static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
  95
  96 static inline unsigned int IN_FROM_REG(u8 reg, int n)
  97 {
  98         return SCALE(reg, nom_mv[n], 192);
  99 }
 100
 101 static inline u8 IN_TO_REG(unsigned long val, int n)
 102 {
 103         return SENSORS_LIMIT(SCALE(val, 192, nom_mv[n]), 0, 255);
 104 }
 105
 106 /* temperature range: -40..125, 127 disables temperature alarm */
 107 static inline s8 TEMP_TO_REG(long val)
 108 {
 109         return SENSORS_LIMIT(SCALE(val, 1, 1000), -40, 127);
 110 }
 111
 112 /* two fans, each with low fan speed limit */
 113 static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
 114 {
 115         if (!reg) /* error */
 116                 return -1;
 117
 118         if (reg == 255)
 119                 return 0;
 120
 121         return SCALE(1350000, 1, reg * div);
 122 }
 123
 124 /* analog out 0..1250mV */
 125 static inline u8 AOUT_TO_REG(unsigned long val)
 126 {
 127         return SENSORS_LIMIT(SCALE(val, 255, 1250), 0, 255);
 128 }
 129
 130 static inline unsigned int AOUT_FROM_REG(u8 reg)
 131 {
 132         return SCALE(reg, 1250, 255);
 133 }
 134
 135 static int adm9240_attach_adapter(struct i2c_adapter *adapter);
 136 static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind);
 137 static void adm9240_init_client(struct i2c_client *client);
 138 static int adm9240_detach_client(struct i2c_client *client);
 139 static struct adm9240_data *adm9240_update_device(struct device *dev);
 140
 141 /* driver data */
 142 static struct i2c_driver adm9240_driver = {
 143         .owner          = THIS_MODULE,
 144         .name           = "adm9240",
 145         .id             = I2C_DRIVERID_ADM9240,
 146         .flags          = I2C_DF_NOTIFY,
 147         .attach_adapter = adm9240_attach_adapter,
 148         .detach_client  = adm9240_detach_client,
 149 };
 150
 151 /* per client data */
 152 struct adm9240_data {
 153         enum chips type;
 154         struct i2c_client client;
 155         struct class_device *class_dev;
 156         struct semaphore update_lock;
 157         char valid;
 158         unsigned long last_updated_measure;
 159         unsigned long last_updated_config;
 160
 161         u8 in[6];               /* ro   in0_input */
 162         u8 in_max[6];           /* rw   in0_max */
 163         u8 in_min[6];           /* rw   in0_min */
 164         u8 fan[2];              /* ro   fan1_input */
 165         u8 fan_min[2];          /* rw   fan1_min */
 166         u8 fan_div[2];          /* rw   fan1_div, read-only accessor */
 167         s16 temp;               /* ro   temp1_input, 9-bit sign-extended */
 168         s8 temp_high;           /* rw   temp1_max */
 169         s8 temp_hyst;           /* rw   temp1_max_hyst */
 170         u16 alarms;             /* ro   alarms */
 171         u8 aout;                /* rw   aout_output */
 172         u8 vid;                 /* ro   vid */
 173         u8 vrm;                 /* --   vrm set on startup, no accessor */
 174 };
 175
 176 /* i2c byte read/write interface */
 177 static int adm9240_read_value(struct i2c_client *client, u8 reg)
 178 {
 179         return i2c_smbus_read_byte_data(client, reg);
 180 }
 181
 182 static int adm9240_write_value(struct i2c_client *client, u8 reg, u8 value)
 183 {
 184         return i2c_smbus_write_byte_data(client, reg, value);
 185 }
 186
 187 /*** sysfs accessors ***/
 188
 189 /* temperature */
 190 #define show_temp(value, scale)                                 \
 191 static ssize_t show_##value(struct device *dev,                 \
 192                             struct device_attribute *attr,      \
 193                             char *buf)                          \
 194 {                                                               \
 195         struct adm9240_data *data = adm9240_update_device(dev); \
 196         return sprintf(buf, "%d\n", data->value * scale);       \
 197 }
 198 show_temp(temp_high, 1000);
 199 show_temp(temp_hyst, 1000);
 200 show_temp(temp, 500); /* 0.5'C per bit */
 201
 202 #define set_temp(value, reg)                                    \
 203 static ssize_t set_##value(struct device *dev,                  \
 204                            struct device_attribute *attr,       \
 205                            const char *buf, size_t count)       \
 206 {                                                               \
 207         struct i2c_client *client = to_i2c_client(dev);         \
 208         struct adm9240_data *data = adm9240_update_device(dev); \
 209         long temp = simple_strtoul(buf, NULL, 10);              \
 210                                                                 \
 211         down(&data->update_lock);                               \
 212         data->value = TEMP_TO_REG(temp);                        \
 213         adm9240_write_value(client, reg, data->value);          \
 214         up(&data->update_lock);                                 \
 215         return count;                                           \
 216 }
 217
 218 set_temp(temp_high, ADM9240_REG_TEMP_HIGH);
 219 set_temp(temp_hyst, ADM9240_REG_TEMP_HYST);
 220
 221 static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
 222                 show_temp_high, set_temp_high);
 223 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
 224                 show_temp_hyst, set_temp_hyst);
 225 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
 226
 227 /* voltage */
 228 static ssize_t show_in(struct device *dev, char *buf, int nr)
 229 {
 230         struct adm9240_data *data = adm9240_update_device(dev);
 231         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
 232 }
 233
 234 static ssize_t show_in_min(struct device *dev, char *buf, int nr)
 235 {
 236         struct adm9240_data *data = adm9240_update_device(dev);
 237         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
 238 }
 239
 240 static ssize_t show_in_max(struct device *dev, char *buf, int nr)
 241 {
 242         struct adm9240_data *data = adm9240_update_device(dev);
 243         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));
 244 }
 245
 246 static ssize_t set_in_min(struct device *dev, const char *buf,
 247                 size_t count, int nr)
 248 {
 249         struct i2c_client *client = to_i2c_client(dev);
 250         struct adm9240_data *data = i2c_get_clientdata(client);
 251         unsigned long val = simple_strtoul(buf, NULL, 10);
 252
 253         down(&data->update_lock);
 254         data->in_min[nr] = IN_TO_REG(val, nr);
 255         adm9240_write_value(client, ADM9240_REG_IN_MIN(nr), data->in_min[nr]);
 256         up(&data->update_lock);
 257         return count;
 258 }
 259
 260 static ssize_t set_in_max(struct device *dev, const char *buf,
 261                 size_t count, int nr)
 262 {
 263         struct i2c_client *client = to_i2c_client(dev);
 264         struct adm9240_data *data = i2c_get_clientdata(client);
 265         unsigned long val = simple_strtoul(buf, NULL, 10);
 266
 267         down(&data->update_lock);
 268         data->in_max[nr] = IN_TO_REG(val, nr);
 269         adm9240_write_value(client, ADM9240_REG_IN_MAX(nr), data->in_max[nr]);
 270         up(&data->update_lock);
 271         return count;
 272 }
 273
 274 #define show_in_offset(offset)                                          \
 275 static ssize_t show_in##offset(struct device *dev,                      \
 276                                struct device_attribute *attr,           \
 277                                char *buf)                               \
 278 {                                                                       \
 279         return show_in(dev, buf, offset);                               \
 280 }                                                                       \
 281 static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL); \
 282 static ssize_t show_in##offset##_min(struct device *dev,                \
 283                                      struct device_attribute *attr,     \
 284                                      char *buf)                         \
 285 {                                                                       \
 286         return show_in_min(dev, buf, offset);                           \
 287 }                                                                       \
 288 static ssize_t show_in##offset##_max(struct device *dev,                \
 289                                      struct device_attribute *attr,     \
 290                                      char *buf)                         \
 291 {                                                                       \
 292         return show_in_max(dev, buf, offset);                           \
 293 }                                                                       \
 294 static ssize_t                                                          \
 295 set_in##offset##_min(struct device *dev,                                \
 296                      struct device_attribute *attr, const char *buf,    \
 297                      size_t count)                                      \
 298 {                                                                       \
 299         return set_in_min(dev, buf, count, offset);                     \
 300 }                                                                       \
 301 static ssize_t                                                          \
 302 set_in##offset##_max(struct device *dev,                                \
 303                      struct device_attribute *attr, const char *buf,    \
 304                      size_t count)                                      \
 305 {                                                                       \
 306         return set_in_max(dev, buf, count, offset);                     \
 307 }                                                                       \
 308 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,                 \
 309                 show_in##offset##_min, set_in##offset##_min);           \
 310 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,                 \
 311                 show_in##offset##_max, set_in##offset##_max);
 312
 313 show_in_offset(0);
 314 show_in_offset(1);
 315 show_in_offset(2);
 316 show_in_offset(3);
 317 show_in_offset(4);
 318 show_in_offset(5);
 319
 320 /* fans */
 321 static ssize_t show_fan(struct device *dev, char *buf, int nr)
 322 {
 323         struct adm9240_data *data = adm9240_update_device(dev);
 324         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 325                                 1 << data->fan_div[nr]));
 326 }
 327
 328 static ssize_t show_fan_min(struct device *dev, char *buf, int nr)
 329 {
 330         struct adm9240_data *data = adm9240_update_device(dev);
 331         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 332                                 1 << data->fan_div[nr]));
 333 }
 334
 335 static ssize_t show_fan_div(struct device *dev, char *buf, int nr)
 336 {
 337         struct adm9240_data *data = adm9240_update_device(dev);
 338         return sprintf(buf, "%d\n", 1 << data->fan_div[nr]);
 339 }
 340
 341 /* write new fan div, callers must hold data->update_lock */
 342 static void adm9240_write_fan_div(struct i2c_client *client, int nr,
 343                 u8 fan_div)
 344 {
 345         u8 reg, old, shift = (nr + 2) * 2;
 346
 347         reg = adm9240_read_value(client, ADM9240_REG_VID_FAN_DIV);
 348         old = (reg >> shift) & 3;
 349         reg &= ~(3 << shift);
 350         reg |= (fan_div << shift);
 351         adm9240_write_value(client, ADM9240_REG_VID_FAN_DIV, reg);
 352         dev_dbg(&client->dev, "fan%d clock divider changed from %u "
 353                         "to %u\n", nr + 1, 1 << old, 1 << fan_div);
 354 }
 355
 356 /*
 357  * set fan speed low limit:
 358  *
 359  * - value is zero: disable fan speed low limit alarm
 360  *
 361  * - value is below fan speed measurement range: enable fan speed low
 362  *   limit alarm to be asserted while fan speed too slow to measure
 363  *
 364  * - otherwise: select fan clock divider to suit fan speed low limit,
 365  *   measurement code may adjust registers to ensure fan speed reading
 366  */
 367 static ssize_t set_fan_min(struct device *dev, const char *buf,
 368                 size_t count, int nr)
 369 {
 370         struct i2c_client *client = to_i2c_client(dev);
 371         struct adm9240_data *data = i2c_get_clientdata(client);
 372         unsigned long val = simple_strtoul(buf, NULL, 10);
 373         u8 new_div;
 374
 375         down(&data->update_lock);
 376
 377         if (!val) {
 378                 data->fan_min[nr] = 255;
 379                 new_div = data->fan_div[nr];
 380
 381                 dev_dbg(&client->dev, "fan%u low limit set disabled\n",
 382                                 nr + 1);
 383
 384         } else if (val < 1350000 / (8 * 254)) {
 385                 new_div = 3;
 386                 data->fan_min[nr] = 254;
 387
 388                 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
 389                                 nr + 1, FAN_FROM_REG(254, 1 << new_div));
 390
 391         } else {
 392                 unsigned int new_min = 1350000 / val;
 393
 394                 new_div = 0;
 395                 while (new_min > 192 && new_div < 3) {
 396                         new_div++;
 397                         new_min /= 2;
 398                 }
 399                 if (!new_min) /* keep > 0 */
 400                         new_min++;
 401
 402                 data->fan_min[nr] = new_min;
 403
 404                 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
 405                                 nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
 406         }
 407
 408         if (new_div != data->fan_div[nr]) {
 409                 data->fan_div[nr] = new_div;
 410                 adm9240_write_fan_div(client, nr, new_div);
 411         }
 412         adm9240_write_value(client, ADM9240_REG_FAN_MIN(nr),
 413                         data->fan_min[nr]);
 414
 415         up(&data->update_lock);
 416         return count;
 417 }
 418
 419 #define show_fan_offset(offset)                                         \
 420 static ssize_t show_fan_##offset (struct device *dev,                   \
 421                                   struct device_attribute *attr,        \
 422                                   char *buf)                            \
 423 {                                                                       \
 424 return show_fan(dev, buf, offset - 1);                                  \
 425 }                                                                       \
 426 static ssize_t show_fan_##offset##_div (struct device *dev,             \
 427                                         struct device_attribute *attr,  \
 428                                         char *buf)                      \
 429 {                                                                       \
 430 return show_fan_div(dev, buf, offset - 1);                              \
 431 }                                                                       \
 432 static ssize_t show_fan_##offset##_min (struct device *dev,             \
 433                                         struct device_attribute *attr,  \
 434                                         char *buf)                      \
 435 {                                                                       \
 436 return show_fan_min(dev, buf, offset - 1);                              \
 437 }                                                                       \
 438 static ssize_t set_fan_##offset##_min (struct device *dev,              \
 439                                        struct device_attribute *attr,   \
 440                                        const char *buf, size_t count)   \
 441 {                                                                       \
 442 return set_fan_min(dev, buf, count, offset - 1);                        \
 443 }                                                                       \
 444 static DEVICE_ATTR(fan##offset##_input, S_IRUGO,                        \
 445                 show_fan_##offset, NULL);                               \
 446 static DEVICE_ATTR(fan##offset##_div, S_IRUGO,                          \
 447                 show_fan_##offset##_div, NULL);                         \
 448 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,                \
 449                 show_fan_##offset##_min, set_fan_##offset##_min);
 450
 451 show_fan_offset(1);
 452 show_fan_offset(2);
 453
 454 /* alarms */
 455 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 456 {
 457         struct adm9240_data *data = adm9240_update_device(dev);
 458         return sprintf(buf, "%u\n", data->alarms);
 459 }
 460 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 461
 462 /* vid */
 463 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 464 {
 465         struct adm9240_data *data = adm9240_update_device(dev);
 466         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 467 }
 468 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 469
 470 /* analog output */
 471 static ssize_t show_aout(struct device *dev, struct device_attribute *attr, char *buf)
 472 {
 473         struct adm9240_data *data = adm9240_update_device(dev);
 474         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 475 }
 476
 477 static ssize_t set_aout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 478 {
 479         struct i2c_client *client = to_i2c_client(dev);
 480         struct adm9240_data *data = i2c_get_clientdata(client);
 481         unsigned long val = simple_strtol(buf, NULL, 10);
 482
 483         down(&data->update_lock);
 484         data->aout = AOUT_TO_REG(val);
 485         adm9240_write_value(client, ADM9240_REG_ANALOG_OUT, data->aout);
 486         up(&data->update_lock);
 487         return count;
 488 }
 489 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
 490
 491 /* chassis_clear */
 492 static ssize_t chassis_clear(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 493 {
 494         struct i2c_client *client = to_i2c_client(dev);
 495         unsigned long val = simple_strtol(buf, NULL, 10);
 496
 497         if (val == 1) {
 498                 adm9240_write_value(client, ADM9240_REG_CHASSIS_CLEAR, 0x80);
 499                 dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
 500         }
 501         return count;
 502 }
 503 static DEVICE_ATTR(chassis_clear, S_IWUSR, NULL, chassis_clear);
 504
 505
 506 /*** sensor chip detect and driver install ***/
 507
 508 static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind)
 509 {
 510         struct i2c_client *new_client;
 511         struct adm9240_data *data;
 512         int err = 0;
 513         const char *name = "";
 514         u8 man_id, die_rev;
 515
 516         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 517                 goto exit;
 518
 519         if (!(data = kmalloc(sizeof(struct adm9240_data), GFP_KERNEL))) {
 520                 err = -ENOMEM;
 521                 goto exit;
 522         }
 523         memset(data, 0, sizeof(struct adm9240_data));
 524
 525         new_client = &data->client;
 526         i2c_set_clientdata(new_client, data);
 527         new_client->addr = address;
 528         new_client->adapter = adapter;
 529         new_client->driver = &adm9240_driver;
 530         new_client->flags = 0;
 531
 532         if (kind == 0) {
 533                 kind = adm9240;
 534         }
 535
 536         if (kind < 0) {
 537
 538                 /* verify chip: reg address should match i2c address */
 539                 if (adm9240_read_value(new_client, ADM9240_REG_I2C_ADDR)
 540                                 != address) {
 541                         dev_err(&adapter->dev, "detect fail: address match, "
 542                                         "0x%02x\n", address);
 543                         goto exit_free;
 544                 }
 545
 546                 /* check known chip manufacturer */
 547                 man_id = adm9240_read_value(new_client, ADM9240_REG_MAN_ID);
 548
 549                 if (man_id == 0x23) {
 550                         kind = adm9240;
 551                 } else if (man_id == 0xda) {
 552                         kind = ds1780;
 553                 } else if (man_id == 0x01) {
 554                         kind = lm81;
 555                 } else {
 556                         dev_err(&adapter->dev, "detect fail: unknown manuf, "
 557                                         "0x%02x\n", man_id);
 558                         goto exit_free;
 559                 }
 560
 561                 /* successful detect, print chip info */
 562                 die_rev = adm9240_read_value(new_client, ADM9240_REG_DIE_REV);
 563                 dev_info(&adapter->dev, "found %s revision %u\n",
 564                                 man_id == 0x23 ? "ADM9240" :
 565                                 man_id == 0xda ? "DS1780" : "LM81", die_rev);
 566         }
 567
 568         /* either forced or detected chip kind */
 569         if (kind == adm9240) {
 570                 name = "adm9240";
 571         } else if (kind == ds1780) {
 572                 name = "ds1780";
 573         } else if (kind == lm81) {
 574                 name = "lm81";
 575         }
 576
 577         /* fill in the remaining client fields and attach */
 578         strlcpy(new_client->name, name, I2C_NAME_SIZE);
 579         data->type = kind;
 580         init_MUTEX(&data->update_lock);
 581
 582         if ((err = i2c_attach_client(new_client)))
 583                 goto exit_free;
 584
 585         adm9240_init_client(new_client);
 586
 587         /* populate sysfs filesystem */
 588         data->class_dev = hwmon_device_register(&new_client->dev);
 589         if (IS_ERR(data->class_dev)) {
 590                 err = PTR_ERR(data->class_dev);
 591                 goto exit_detach;
 592         }
 593
 594         device_create_file(&new_client->dev, &dev_attr_in0_input);
 595         device_create_file(&new_client->dev, &dev_attr_in0_min);
 596         device_create_file(&new_client->dev, &dev_attr_in0_max);
 597         device_create_file(&new_client->dev, &dev_attr_in1_input);
 598         device_create_file(&new_client->dev, &dev_attr_in1_min);
 599         device_create_file(&new_client->dev, &dev_attr_in1_max);
 600         device_create_file(&new_client->dev, &dev_attr_in2_input);
 601         device_create_file(&new_client->dev, &dev_attr_in2_min);
 602         device_create_file(&new_client->dev, &dev_attr_in2_max);
 603         device_create_file(&new_client->dev, &dev_attr_in3_input);
 604         device_create_file(&new_client->dev, &dev_attr_in3_min);
 605         device_create_file(&new_client->dev, &dev_attr_in3_max);
 606         device_create_file(&new_client->dev, &dev_attr_in4_input);
 607         device_create_file(&new_client->dev, &dev_attr_in4_min);
 608         device_create_file(&new_client->dev, &dev_attr_in4_max);
 609         device_create_file(&new_client->dev, &dev_attr_in5_input);
 610         device_create_file(&new_client->dev, &dev_attr_in5_min);
 611         device_create_file(&new_client->dev, &dev_attr_in5_max);
 612         device_create_file(&new_client->dev, &dev_attr_temp1_max);
 613         device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
 614         device_create_file(&new_client->dev, &dev_attr_temp1_input);
 615         device_create_file(&new_client->dev, &dev_attr_fan1_input);
 616         device_create_file(&new_client->dev, &dev_attr_fan1_div);
 617         device_create_file(&new_client->dev, &dev_attr_fan1_min);
 618         device_create_file(&new_client->dev, &dev_attr_fan2_input);
 619         device_create_file(&new_client->dev, &dev_attr_fan2_div);
 620         device_create_file(&new_client->dev, &dev_attr_fan2_min);
 621         device_create_file(&new_client->dev, &dev_attr_alarms);
 622         device_create_file(&new_client->dev, &dev_attr_aout_output);
 623         device_create_file(&new_client->dev, &dev_attr_chassis_clear);
 624         device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
 625
 626         return 0;
 627
 628 exit_detach:
 629         i2c_detach_client(new_client);
 630 exit_free:
 631         kfree(data);
 632 exit:
 633         return err;
 634 }
 635
 636 static int adm9240_attach_adapter(struct i2c_adapter *adapter)
 637 {
 638         if (!(adapter->class & I2C_CLASS_HWMON))
 639                 return 0;
 640         return i2c_detect(adapter, &addr_data, adm9240_detect);
 641 }
 642
 643 static int adm9240_detach_client(struct i2c_client *client)
 644 {
 645         struct adm9240_data *data = i2c_get_clientdata(client);
 646         int err;
 647
 648         hwmon_device_unregister(data->class_dev);
 649
 650         if ((err = i2c_detach_client(client))) {
 651                 dev_err(&client->dev, "Client deregistration failed, "
 652                                 "client not detached.\n");
 653                 return err;
 654         }
 655
 656         kfree(data);
 657         return 0;
 658 }
 659
 660 static void adm9240_init_client(struct i2c_client *client)
 661 {
 662         struct adm9240_data *data = i2c_get_clientdata(client);
 663         u8 conf = adm9240_read_value(client, ADM9240_REG_CONFIG);
 664         u8 mode = adm9240_read_value(client, ADM9240_REG_TEMP_CONF) & 3;
 665
 666         data->vrm = i2c_which_vrm(); /* need this to report vid as mV */
 667
 668         dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10,
 669                         data->vrm % 10);
 670
 671         if (conf & 1) { /* measurement cycle running: report state */
 672
 673                 dev_info(&client->dev, "status: config 0x%02x mode %u\n",
 674                                 conf, mode);
 675
 676         } else { /* cold start: open limits before starting chip */
 677                 int i;
 678
 679                 for (i = 0; i < 6; i++)
 680                 {
 681                         adm9240_write_value(client,
 682                                         ADM9240_REG_IN_MIN(i), 0);
 683                         adm9240_write_value(client,
 684                                         ADM9240_REG_IN_MAX(i), 255);
 685                 }
 686                 adm9240_write_value(client, ADM9240_REG_FAN_MIN(0), 255);
 687                 adm9240_write_value(client, ADM9240_REG_FAN_MIN(1), 255);
 688                 adm9240_write_value(client, ADM9240_REG_TEMP_HIGH, 127);
 689                 adm9240_write_value(client, ADM9240_REG_TEMP_HYST, 127);
 690
 691                 /* start measurement cycle */
 692                 adm9240_write_value(client, ADM9240_REG_CONFIG, 1);
 693
 694                 dev_info(&client->dev, "cold start: config was 0x%02x "
 695                                 "mode %u\n", conf, mode);
 696         }
 697 }
 698
 699 static struct adm9240_data *adm9240_update_device(struct device *dev)
 700 {
 701         struct i2c_client *client = to_i2c_client(dev);
 702         struct adm9240_data *data = i2c_get_clientdata(client);
 703         int i;
 704
 705         down(&data->update_lock);
 706
 707         /* minimum measurement cycle: 1.75 seconds */
 708         if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
 709                         || !data->valid) {
 710
 711                 for (i = 0; i < 6; i++) /* read voltages */
 712                 {
 713                         data->in[i] = adm9240_read_value(client,
 714                                         ADM9240_REG_IN(i));
 715                 }
 716                 data->alarms = adm9240_read_value(client,
 717                                         ADM9240_REG_INT(0)) |
 718                                         adm9240_read_value(client,
 719                                         ADM9240_REG_INT(1)) << 8;
 720
 721                 /* read temperature: assume temperature changes less than
 722                  * 0.5'C per two measurement cycles thus ignore possible
 723                  * but unlikely aliasing error on lsb reading. --Grant */
 724                 data->temp = ((adm9240_read_value(client,
 725                                         ADM9240_REG_TEMP) << 8) |
 726                                         adm9240_read_value(client,
 727                                         ADM9240_REG_TEMP_CONF)) / 128;
 728
 729                 for (i = 0; i < 2; i++) /* read fans */
 730                 {
 731                         data->fan[i] = adm9240_read_value(client,
 732                                         ADM9240_REG_FAN(i));
 733
 734                         /* adjust fan clock divider on overflow */
 735                         if (data->valid && data->fan[i] == 255 &&
 736                                         data->fan_div[i] < 3) {
 737
 738                                 adm9240_write_fan_div(client, i,
 739                                                 ++data->fan_div[i]);
 740
 741                                 /* adjust fan_min if active, but not to 0 */
 742                                 if (data->fan_min[i] < 255 &&
 743                                                 data->fan_min[i] >= 2)
 744                                         data->fan_min[i] /= 2;
 745                         }
 746                 }
 747                 data->last_updated_measure = jiffies;
 748         }
 749
 750         /* minimum config reading cycle: 300 seconds */
 751         if (time_after(jiffies, data->last_updated_config + (HZ * 300))
 752                         || !data->valid) {
 753
 754                 for (i = 0; i < 6; i++)
 755                 {
 756                         data->in_min[i] = adm9240_read_value(client,
 757                                         ADM9240_REG_IN_MIN(i));
 758                         data->in_max[i] = adm9240_read_value(client,
 759                                         ADM9240_REG_IN_MAX(i));
 760                 }
 761                 for (i = 0; i < 2; i++)
 762                 {
 763                         data->fan_min[i] = adm9240_read_value(client,
 764                                         ADM9240_REG_FAN_MIN(i));
 765                 }
 766                 data->temp_high = adm9240_read_value(client,
 767                                 ADM9240_REG_TEMP_HIGH);
 768                 data->temp_hyst = adm9240_read_value(client,
 769                                 ADM9240_REG_TEMP_HYST);
 770
 771                 /* read fan divs and 5-bit VID */
 772                 i = adm9240_read_value(client, ADM9240_REG_VID_FAN_DIV);
 773                 data->fan_div[0] = (i >> 4) & 3;
 774                 data->fan_div[1] = (i >> 6) & 3;
 775                 data->vid = i & 0x0f;
 776                 data->vid |= (adm9240_read_value(client,
 777                                         ADM9240_REG_VID4) & 1) << 4;
 778                 /* read analog out */
 779                 data->aout = adm9240_read_value(client,
 780                                 ADM9240_REG_ANALOG_OUT);
 781
 782                 data->last_updated_config = jiffies;
 783                 data->valid = 1;
 784         }
 785         up(&data->update_lock);
 786         return data;
 787 }
 788
 789 static int __init sensors_adm9240_init(void)
 790 {
 791         return i2c_add_driver(&adm9240_driver);
 792 }
 793
 794 static void __exit sensors_adm9240_exit(void)
 795 {
 796         i2c_del_driver(&adm9240_driver);
 797 }
 798
 799 MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
 800                 "Grant Coady <gcoady@gmail.com> and others");
 801 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
 802 MODULE_LICENSE("GPL");
 803
 804 module_init(sensors_adm9240_init);
 805 module_exit(sensors_adm9240_exit);
 806