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 /*** sysfs accessors ***/
 174
 175 /* temperature */
 176 #define show_temp(value, scale)                                 \
 177 static ssize_t show_##value(struct device *dev,                 \
 178                             struct device_attribute *attr,      \
 179                             char *buf)                          \
 180 {                                                               \
 181         struct adm9240_data *data = adm9240_update_device(dev); \
 182         return sprintf(buf, "%d\n", data->value * scale);       \
 183 }
 184 show_temp(temp_high, 1000);
 185 show_temp(temp_hyst, 1000);
 186 show_temp(temp, 500); /* 0.5'C per bit */
 187
 188 #define set_temp(value, reg)                                    \
 189 static ssize_t set_##value(struct device *dev,                  \
 190                            struct device_attribute *attr,       \
 191                            const char *buf, size_t count)       \
 192 {                                                               \
 193         struct i2c_client *client = to_i2c_client(dev);         \
 194         struct adm9240_data *data = adm9240_update_device(dev); \
 195         long temp = simple_strtoul(buf, NULL, 10);              \
 196                                                                 \
 197         down(&data->update_lock);                               \
 198         data->value = TEMP_TO_REG(temp);                        \
 199         i2c_smbus_write_byte_data(client, reg, data->value);    \
 200         up(&data->update_lock);                                 \
 201         return count;                                           \
 202 }
 203
 204 set_temp(temp_high, ADM9240_REG_TEMP_HIGH);
 205 set_temp(temp_hyst, ADM9240_REG_TEMP_HYST);
 206
 207 static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
 208                 show_temp_high, set_temp_high);
 209 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
 210                 show_temp_hyst, set_temp_hyst);
 211 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
 212
 213 /* voltage */
 214 static ssize_t show_in(struct device *dev, char *buf, int nr)
 215 {
 216         struct adm9240_data *data = adm9240_update_device(dev);
 217         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
 218 }
 219
 220 static ssize_t show_in_min(struct device *dev, char *buf, int nr)
 221 {
 222         struct adm9240_data *data = adm9240_update_device(dev);
 223         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
 224 }
 225
 226 static ssize_t show_in_max(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_max[nr], nr));
 230 }
 231
 232 static ssize_t set_in_min(struct device *dev, const char *buf,
 233                 size_t count, int nr)
 234 {
 235         struct i2c_client *client = to_i2c_client(dev);
 236         struct adm9240_data *data = i2c_get_clientdata(client);
 237         unsigned long val = simple_strtoul(buf, NULL, 10);
 238
 239         down(&data->update_lock);
 240         data->in_min[nr] = IN_TO_REG(val, nr);
 241         i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(nr),
 242                         data->in_min[nr]);
 243         up(&data->update_lock);
 244         return count;
 245 }
 246
 247 static ssize_t set_in_max(struct device *dev, const char *buf,
 248                 size_t count, int nr)
 249 {
 250         struct i2c_client *client = to_i2c_client(dev);
 251         struct adm9240_data *data = i2c_get_clientdata(client);
 252         unsigned long val = simple_strtoul(buf, NULL, 10);
 253
 254         down(&data->update_lock);
 255         data->in_max[nr] = IN_TO_REG(val, nr);
 256         i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(nr),
 257                         data->in_max[nr]);
 258         up(&data->update_lock);
 259         return count;
 260 }
 261
 262 #define show_in_offset(offset)                                          \
 263 static ssize_t show_in##offset(struct device *dev,                      \
 264                                struct device_attribute *attr,           \
 265                                char *buf)                               \
 266 {                                                                       \
 267         return show_in(dev, buf, offset);                               \
 268 }                                                                       \
 269 static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL); \
 270 static ssize_t show_in##offset##_min(struct device *dev,                \
 271                                      struct device_attribute *attr,     \
 272                                      char *buf)                         \
 273 {                                                                       \
 274         return show_in_min(dev, buf, offset);                           \
 275 }                                                                       \
 276 static ssize_t show_in##offset##_max(struct device *dev,                \
 277                                      struct device_attribute *attr,     \
 278                                      char *buf)                         \
 279 {                                                                       \
 280         return show_in_max(dev, buf, offset);                           \
 281 }                                                                       \
 282 static ssize_t                                                          \
 283 set_in##offset##_min(struct device *dev,                                \
 284                      struct device_attribute *attr, const char *buf,    \
 285                      size_t count)                                      \
 286 {                                                                       \
 287         return set_in_min(dev, buf, count, offset);                     \
 288 }                                                                       \
 289 static ssize_t                                                          \
 290 set_in##offset##_max(struct device *dev,                                \
 291                      struct device_attribute *attr, const char *buf,    \
 292                      size_t count)                                      \
 293 {                                                                       \
 294         return set_in_max(dev, buf, count, offset);                     \
 295 }                                                                       \
 296 static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,                 \
 297                 show_in##offset##_min, set_in##offset##_min);           \
 298 static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,                 \
 299                 show_in##offset##_max, set_in##offset##_max);
 300
 301 show_in_offset(0);
 302 show_in_offset(1);
 303 show_in_offset(2);
 304 show_in_offset(3);
 305 show_in_offset(4);
 306 show_in_offset(5);
 307
 308 /* fans */
 309 static ssize_t show_fan(struct device *dev, char *buf, int nr)
 310 {
 311         struct adm9240_data *data = adm9240_update_device(dev);
 312         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 313                                 1 << data->fan_div[nr]));
 314 }
 315
 316 static ssize_t show_fan_min(struct device *dev, char *buf, int nr)
 317 {
 318         struct adm9240_data *data = adm9240_update_device(dev);
 319         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 320                                 1 << data->fan_div[nr]));
 321 }
 322
 323 static ssize_t show_fan_div(struct device *dev, char *buf, int nr)
 324 {
 325         struct adm9240_data *data = adm9240_update_device(dev);
 326         return sprintf(buf, "%d\n", 1 << data->fan_div[nr]);
 327 }
 328
 329 /* write new fan div, callers must hold data->update_lock */
 330 static void adm9240_write_fan_div(struct i2c_client *client, int nr,
 331                 u8 fan_div)
 332 {
 333         u8 reg, old, shift = (nr + 2) * 2;
 334
 335         reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
 336         old = (reg >> shift) & 3;
 337         reg &= ~(3 << shift);
 338         reg |= (fan_div << shift);
 339         i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg);
 340         dev_dbg(&client->dev, "fan%d clock divider changed from %u "
 341                         "to %u\n", nr + 1, 1 << old, 1 << fan_div);
 342 }
 343
 344 /*
 345  * set fan speed low limit:
 346  *
 347  * - value is zero: disable fan speed low limit alarm
 348  *
 349  * - value is below fan speed measurement range: enable fan speed low
 350  *   limit alarm to be asserted while fan speed too slow to measure
 351  *
 352  * - otherwise: select fan clock divider to suit fan speed low limit,
 353  *   measurement code may adjust registers to ensure fan speed reading
 354  */
 355 static ssize_t set_fan_min(struct device *dev, const char *buf,
 356                 size_t count, int nr)
 357 {
 358         struct i2c_client *client = to_i2c_client(dev);
 359         struct adm9240_data *data = i2c_get_clientdata(client);
 360         unsigned long val = simple_strtoul(buf, NULL, 10);
 361         u8 new_div;
 362
 363         down(&data->update_lock);
 364
 365         if (!val) {
 366                 data->fan_min[nr] = 255;
 367                 new_div = data->fan_div[nr];
 368
 369                 dev_dbg(&client->dev, "fan%u low limit set disabled\n",
 370                                 nr + 1);
 371
 372         } else if (val < 1350000 / (8 * 254)) {
 373                 new_div = 3;
 374                 data->fan_min[nr] = 254;
 375
 376                 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
 377                                 nr + 1, FAN_FROM_REG(254, 1 << new_div));
 378
 379         } else {
 380                 unsigned int new_min = 1350000 / val;
 381
 382                 new_div = 0;
 383                 while (new_min > 192 && new_div < 3) {
 384                         new_div++;
 385                         new_min /= 2;
 386                 }
 387                 if (!new_min) /* keep > 0 */
 388                         new_min++;
 389
 390                 data->fan_min[nr] = new_min;
 391
 392                 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
 393                                 nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
 394         }
 395
 396         if (new_div != data->fan_div[nr]) {
 397                 data->fan_div[nr] = new_div;
 398                 adm9240_write_fan_div(client, nr, new_div);
 399         }
 400         i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr),
 401                         data->fan_min[nr]);
 402
 403         up(&data->update_lock);
 404         return count;
 405 }
 406
 407 #define show_fan_offset(offset)                                         \
 408 static ssize_t show_fan_##offset (struct device *dev,                   \
 409                                   struct device_attribute *attr,        \
 410                                   char *buf)                            \
 411 {                                                                       \
 412 return show_fan(dev, buf, offset - 1);                                  \
 413 }                                                                       \
 414 static ssize_t show_fan_##offset##_div (struct device *dev,             \
 415                                         struct device_attribute *attr,  \
 416                                         char *buf)                      \
 417 {                                                                       \
 418 return show_fan_div(dev, buf, offset - 1);                              \
 419 }                                                                       \
 420 static ssize_t show_fan_##offset##_min (struct device *dev,             \
 421                                         struct device_attribute *attr,  \
 422                                         char *buf)                      \
 423 {                                                                       \
 424 return show_fan_min(dev, buf, offset - 1);                              \
 425 }                                                                       \
 426 static ssize_t set_fan_##offset##_min (struct device *dev,              \
 427                                        struct device_attribute *attr,   \
 428                                        const char *buf, size_t count)   \
 429 {                                                                       \
 430 return set_fan_min(dev, buf, count, offset - 1);                        \
 431 }                                                                       \
 432 static DEVICE_ATTR(fan##offset##_input, S_IRUGO,                        \
 433                 show_fan_##offset, NULL);                               \
 434 static DEVICE_ATTR(fan##offset##_div, S_IRUGO,                          \
 435                 show_fan_##offset##_div, NULL);                         \
 436 static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,                \
 437                 show_fan_##offset##_min, set_fan_##offset##_min);
 438
 439 show_fan_offset(1);
 440 show_fan_offset(2);
 441
 442 /* alarms */
 443 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 444 {
 445         struct adm9240_data *data = adm9240_update_device(dev);
 446         return sprintf(buf, "%u\n", data->alarms);
 447 }
 448 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 449
 450 /* vid */
 451 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 452 {
 453         struct adm9240_data *data = adm9240_update_device(dev);
 454         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 455 }
 456 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 457
 458 /* analog output */
 459 static ssize_t show_aout(struct device *dev, struct device_attribute *attr, char *buf)
 460 {
 461         struct adm9240_data *data = adm9240_update_device(dev);
 462         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 463 }
 464
 465 static ssize_t set_aout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 466 {
 467         struct i2c_client *client = to_i2c_client(dev);
 468         struct adm9240_data *data = i2c_get_clientdata(client);
 469         unsigned long val = simple_strtol(buf, NULL, 10);
 470
 471         down(&data->update_lock);
 472         data->aout = AOUT_TO_REG(val);
 473         i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout);
 474         up(&data->update_lock);
 475         return count;
 476 }
 477 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
 478
 479 /* chassis_clear */
 480 static ssize_t chassis_clear(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 481 {
 482         struct i2c_client *client = to_i2c_client(dev);
 483         unsigned long val = simple_strtol(buf, NULL, 10);
 484
 485         if (val == 1) {
 486                 i2c_smbus_write_byte_data(client,
 487                                 ADM9240_REG_CHASSIS_CLEAR, 0x80);
 488                 dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
 489         }
 490         return count;
 491 }
 492 static DEVICE_ATTR(chassis_clear, S_IWUSR, NULL, chassis_clear);
 493
 494
 495 /*** sensor chip detect and driver install ***/
 496
 497 static int adm9240_detect(struct i2c_adapter *adapter, int address, int kind)
 498 {
 499         struct i2c_client *new_client;
 500         struct adm9240_data *data;
 501         int err = 0;
 502         const char *name = "";
 503         u8 man_id, die_rev;
 504
 505         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 506                 goto exit;
 507
 508         if (!(data = kzalloc(sizeof(*data), GFP_KERNEL))) {
 509                 err = -ENOMEM;
 510                 goto exit;
 511         }
 512
 513         new_client = &data->client;
 514         i2c_set_clientdata(new_client, data);
 515         new_client->addr = address;
 516         new_client->adapter = adapter;
 517         new_client->driver = &adm9240_driver;
 518         new_client->flags = 0;
 519
 520         if (kind == 0) {
 521                 kind = adm9240;
 522         }
 523
 524         if (kind < 0) {
 525
 526                 /* verify chip: reg address should match i2c address */
 527                 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR)
 528                                 != address) {
 529                         dev_err(&adapter->dev, "detect fail: address match, "
 530                                         "0x%02x\n", address);
 531                         goto exit_free;
 532                 }
 533
 534                 /* check known chip manufacturer */
 535                 man_id = i2c_smbus_read_byte_data(new_client,
 536                                 ADM9240_REG_MAN_ID);
 537                 if (man_id == 0x23) {
 538                         kind = adm9240;
 539                 } else if (man_id == 0xda) {
 540                         kind = ds1780;
 541                 } else if (man_id == 0x01) {
 542                         kind = lm81;
 543                 } else {
 544                         dev_err(&adapter->dev, "detect fail: unknown manuf, "
 545                                         "0x%02x\n", man_id);
 546                         goto exit_free;
 547                 }
 548
 549                 /* successful detect, print chip info */
 550                 die_rev = i2c_smbus_read_byte_data(new_client,
 551                                 ADM9240_REG_DIE_REV);
 552                 dev_info(&adapter->dev, "found %s revision %u\n",
 553                                 man_id == 0x23 ? "ADM9240" :
 554                                 man_id == 0xda ? "DS1780" : "LM81", die_rev);
 555         }
 556
 557         /* either forced or detected chip kind */
 558         if (kind == adm9240) {
 559                 name = "adm9240";
 560         } else if (kind == ds1780) {
 561                 name = "ds1780";
 562         } else if (kind == lm81) {
 563                 name = "lm81";
 564         }
 565
 566         /* fill in the remaining client fields and attach */
 567         strlcpy(new_client->name, name, I2C_NAME_SIZE);
 568         data->type = kind;
 569         init_MUTEX(&data->update_lock);
 570
 571         if ((err = i2c_attach_client(new_client)))
 572                 goto exit_free;
 573
 574         adm9240_init_client(new_client);
 575
 576         /* populate sysfs filesystem */
 577         data->class_dev = hwmon_device_register(&new_client->dev);
 578         if (IS_ERR(data->class_dev)) {
 579                 err = PTR_ERR(data->class_dev);
 580                 goto exit_detach;
 581         }
 582
 583         device_create_file(&new_client->dev, &dev_attr_in0_input);
 584         device_create_file(&new_client->dev, &dev_attr_in0_min);
 585         device_create_file(&new_client->dev, &dev_attr_in0_max);
 586         device_create_file(&new_client->dev, &dev_attr_in1_input);
 587         device_create_file(&new_client->dev, &dev_attr_in1_min);
 588         device_create_file(&new_client->dev, &dev_attr_in1_max);
 589         device_create_file(&new_client->dev, &dev_attr_in2_input);
 590         device_create_file(&new_client->dev, &dev_attr_in2_min);
 591         device_create_file(&new_client->dev, &dev_attr_in2_max);
 592         device_create_file(&new_client->dev, &dev_attr_in3_input);
 593         device_create_file(&new_client->dev, &dev_attr_in3_min);
 594         device_create_file(&new_client->dev, &dev_attr_in3_max);
 595         device_create_file(&new_client->dev, &dev_attr_in4_input);
 596         device_create_file(&new_client->dev, &dev_attr_in4_min);
 597         device_create_file(&new_client->dev, &dev_attr_in4_max);
 598         device_create_file(&new_client->dev, &dev_attr_in5_input);
 599         device_create_file(&new_client->dev, &dev_attr_in5_min);
 600         device_create_file(&new_client->dev, &dev_attr_in5_max);
 601         device_create_file(&new_client->dev, &dev_attr_temp1_max);
 602         device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
 603         device_create_file(&new_client->dev, &dev_attr_temp1_input);
 604         device_create_file(&new_client->dev, &dev_attr_fan1_input);
 605         device_create_file(&new_client->dev, &dev_attr_fan1_div);
 606         device_create_file(&new_client->dev, &dev_attr_fan1_min);
 607         device_create_file(&new_client->dev, &dev_attr_fan2_input);
 608         device_create_file(&new_client->dev, &dev_attr_fan2_div);
 609         device_create_file(&new_client->dev, &dev_attr_fan2_min);
 610         device_create_file(&new_client->dev, &dev_attr_alarms);
 611         device_create_file(&new_client->dev, &dev_attr_aout_output);
 612         device_create_file(&new_client->dev, &dev_attr_chassis_clear);
 613         device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
 614
 615         return 0;
 616
 617 exit_detach:
 618         i2c_detach_client(new_client);
 619 exit_free:
 620         kfree(data);
 621 exit:
 622         return err;
 623 }
 624
 625 static int adm9240_attach_adapter(struct i2c_adapter *adapter)
 626 {
 627         if (!(adapter->class & I2C_CLASS_HWMON))
 628                 return 0;
 629         return i2c_probe(adapter, &addr_data, adm9240_detect);
 630 }
 631
 632 static int adm9240_detach_client(struct i2c_client *client)
 633 {
 634         struct adm9240_data *data = i2c_get_clientdata(client);
 635         int err;
 636
 637         hwmon_device_unregister(data->class_dev);
 638
 639         if ((err = i2c_detach_client(client)))
 640                 return err;
 641
 642         kfree(data);
 643         return 0;
 644 }
 645
 646 static void adm9240_init_client(struct i2c_client *client)
 647 {
 648         struct adm9240_data *data = i2c_get_clientdata(client);
 649         u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG);
 650         u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3;
 651
 652         data->vrm = vid_which_vrm(); /* need this to report vid as mV */
 653
 654         dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10,
 655                         data->vrm % 10);
 656
 657         if (conf & 1) { /* measurement cycle running: report state */
 658
 659                 dev_info(&client->dev, "status: config 0x%02x mode %u\n",
 660                                 conf, mode);
 661
 662         } else { /* cold start: open limits before starting chip */
 663                 int i;
 664
 665                 for (i = 0; i < 6; i++)
 666                 {
 667                         i2c_smbus_write_byte_data(client,
 668                                         ADM9240_REG_IN_MIN(i), 0);
 669                         i2c_smbus_write_byte_data(client,
 670                                         ADM9240_REG_IN_MAX(i), 255);
 671                 }
 672                 i2c_smbus_write_byte_data(client,
 673                                 ADM9240_REG_FAN_MIN(0), 255);
 674                 i2c_smbus_write_byte_data(client,
 675                                 ADM9240_REG_FAN_MIN(1), 255);
 676                 i2c_smbus_write_byte_data(client,
 677                                 ADM9240_REG_TEMP_HIGH, 127);
 678                 i2c_smbus_write_byte_data(client,
 679                                 ADM9240_REG_TEMP_HYST, 127);
 680
 681                 /* start measurement cycle */
 682                 i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1);
 683
 684                 dev_info(&client->dev, "cold start: config was 0x%02x "
 685                                 "mode %u\n", conf, mode);
 686         }
 687 }
 688
 689 static struct adm9240_data *adm9240_update_device(struct device *dev)
 690 {
 691         struct i2c_client *client = to_i2c_client(dev);
 692         struct adm9240_data *data = i2c_get_clientdata(client);
 693         int i;
 694
 695         down(&data->update_lock);
 696
 697         /* minimum measurement cycle: 1.75 seconds */
 698         if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
 699                         || !data->valid) {
 700
 701                 for (i = 0; i < 6; i++) /* read voltages */
 702                 {
 703                         data->in[i] = i2c_smbus_read_byte_data(client,
 704                                         ADM9240_REG_IN(i));
 705                 }
 706                 data->alarms = i2c_smbus_read_byte_data(client,
 707                                         ADM9240_REG_INT(0)) |
 708                                         i2c_smbus_read_byte_data(client,
 709                                         ADM9240_REG_INT(1)) << 8;
 710
 711                 /* read temperature: assume temperature changes less than
 712                  * 0.5'C per two measurement cycles thus ignore possible
 713                  * but unlikely aliasing error on lsb reading. --Grant */
 714                 data->temp = ((i2c_smbus_read_byte_data(client,
 715                                         ADM9240_REG_TEMP) << 8) |
 716                                         i2c_smbus_read_byte_data(client,
 717                                         ADM9240_REG_TEMP_CONF)) / 128;
 718
 719                 for (i = 0; i < 2; i++) /* read fans */
 720                 {
 721                         data->fan[i] = i2c_smbus_read_byte_data(client,
 722                                         ADM9240_REG_FAN(i));
 723
 724                         /* adjust fan clock divider on overflow */
 725                         if (data->valid && data->fan[i] == 255 &&
 726                                         data->fan_div[i] < 3) {
 727
 728                                 adm9240_write_fan_div(client, i,
 729                                                 ++data->fan_div[i]);
 730
 731                                 /* adjust fan_min if active, but not to 0 */
 732                                 if (data->fan_min[i] < 255 &&
 733                                                 data->fan_min[i] >= 2)
 734                                         data->fan_min[i] /= 2;
 735                         }
 736                 }
 737                 data->last_updated_measure = jiffies;
 738         }
 739
 740         /* minimum config reading cycle: 300 seconds */
 741         if (time_after(jiffies, data->last_updated_config + (HZ * 300))
 742                         || !data->valid) {
 743
 744                 for (i = 0; i < 6; i++)
 745                 {
 746                         data->in_min[i] = i2c_smbus_read_byte_data(client,
 747                                         ADM9240_REG_IN_MIN(i));
 748                         data->in_max[i] = i2c_smbus_read_byte_data(client,
 749                                         ADM9240_REG_IN_MAX(i));
 750                 }
 751                 for (i = 0; i < 2; i++)
 752                 {
 753                         data->fan_min[i] = i2c_smbus_read_byte_data(client,
 754                                         ADM9240_REG_FAN_MIN(i));
 755                 }
 756                 data->temp_high = i2c_smbus_read_byte_data(client,
 757                                 ADM9240_REG_TEMP_HIGH);
 758                 data->temp_hyst = i2c_smbus_read_byte_data(client,
 759                                 ADM9240_REG_TEMP_HYST);
 760
 761                 /* read fan divs and 5-bit VID */
 762                 i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
 763                 data->fan_div[0] = (i >> 4) & 3;
 764                 data->fan_div[1] = (i >> 6) & 3;
 765                 data->vid = i & 0x0f;
 766                 data->vid |= (i2c_smbus_read_byte_data(client,
 767                                         ADM9240_REG_VID4) & 1) << 4;
 768                 /* read analog out */
 769                 data->aout = i2c_smbus_read_byte_data(client,
 770                                 ADM9240_REG_ANALOG_OUT);
 771
 772                 data->last_updated_config = jiffies;
 773                 data->valid = 1;
 774         }
 775         up(&data->update_lock);
 776         return data;
 777 }
 778
 779 static int __init sensors_adm9240_init(void)
 780 {
 781         return i2c_add_driver(&adm9240_driver);
 782 }
 783
 784 static void __exit sensors_adm9240_exit(void)
 785 {
 786         i2c_del_driver(&adm9240_driver);
 787 }
 788
 789 MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
 790                 "Grant Coady <gcoady@gmail.com> and others");
 791 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
 792 MODULE_LICENSE("GPL");
 793
 794 module_init(sensors_adm9240_init);
 795 module_exit(sensors_adm9240_exit);
 796