drivers/hwmon/smsc47m192.c

   1 /*
   2  * smsc47m192.c - Support for hardware monitoring block of
   3  *                SMSC LPC47M192 and compatible Super I/O chips
   4  *
   5  * Copyright (C) 2006  Hartmut Rick <linux@rick.claranet.de>
   6  *
   7  * Derived from lm78.c and other chip drivers.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/slab.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/i2c.h>
  29 #include <linux/hwmon.h>
  30 #include <linux/hwmon-sysfs.h>
  31 #include <linux/hwmon-vid.h>
  32 #include <linux/err.h>
  33 #include <linux/sysfs.h>
  34 #include <linux/mutex.h>
  35
  36 /* Addresses to scan */
  37 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
  38
  39 /* SMSC47M192 registers */
  40 #define SMSC47M192_REG_IN(nr)           ((nr) < 6 ? (0x20 + (nr)) : \
  41                                         (0x50 + (nr) - 6))
  42 #define SMSC47M192_REG_IN_MAX(nr)       ((nr) < 6 ? (0x2b + (nr) * 2) : \
  43                                         (0x54 + (((nr) - 6) * 2)))
  44 #define SMSC47M192_REG_IN_MIN(nr)       ((nr) < 6 ? (0x2c + (nr) * 2) : \
  45                                         (0x55 + (((nr) - 6) * 2)))
  46 static u8 SMSC47M192_REG_TEMP[3] =      { 0x27, 0x26, 0x52 };
  47 static u8 SMSC47M192_REG_TEMP_MAX[3] =  { 0x39, 0x37, 0x58 };
  48 static u8 SMSC47M192_REG_TEMP_MIN[3] =  { 0x3A, 0x38, 0x59 };
  49 #define SMSC47M192_REG_TEMP_OFFSET(nr)  ((nr) == 2 ? 0x1e : 0x1f)
  50 #define SMSC47M192_REG_ALARM1           0x41
  51 #define SMSC47M192_REG_ALARM2           0x42
  52 #define SMSC47M192_REG_VID              0x47
  53 #define SMSC47M192_REG_VID4             0x49
  54 #define SMSC47M192_REG_CONFIG           0x40
  55 #define SMSC47M192_REG_SFR              0x4f
  56 #define SMSC47M192_REG_COMPANY_ID       0x3e
  57 #define SMSC47M192_REG_VERSION          0x3f
  58
  59 /* generalised scaling with integer rounding */
  60 static inline int SCALE(long val, int mul, int div)
  61 {
  62         if (val < 0)
  63                 return (val * mul - div / 2) / div;
  64         else
  65                 return (val * mul + div / 2) / div;
  66 }
  67
  68 /* Conversions */
  69
  70 /* smsc47m192 internally scales voltage measurements */
  71 static const u16 nom_mv[] = { 2500, 2250, 3300, 5000, 12000, 3300, 1500, 1800 };
  72
  73 static inline unsigned int IN_FROM_REG(u8 reg, int n)
  74 {
  75         return SCALE(reg, nom_mv[n], 192);
  76 }
  77
  78 static inline u8 IN_TO_REG(unsigned long val, int n)
  79 {
  80         return clamp_val(SCALE(val, 192, nom_mv[n]), 0, 255);
  81 }
  82
  83 /*
  84  * TEMP: 0.001 degC units (-128C to +127C)
  85  * REG: 1C/bit, two's complement
  86  */
  87 static inline s8 TEMP_TO_REG(int val)
  88 {
  89         return SCALE(clamp_val(val, -128000, 127000), 1, 1000);
  90 }
  91
  92 static inline int TEMP_FROM_REG(s8 val)
  93 {
  94         return val * 1000;
  95 }
  96
  97 struct smsc47m192_data {
  98         struct device *hwmon_dev;
  99         struct mutex update_lock;
 100         char valid;             /* !=0 if following fields are valid */
 101         unsigned long last_updated;     /* In jiffies */
 102
 103         u8 in[8];               /* Register value */
 104         u8 in_max[8];           /* Register value */
 105         u8 in_min[8];           /* Register value */
 106         s8 temp[3];             /* Register value */
 107         s8 temp_max[3];         /* Register value */
 108         s8 temp_min[3];         /* Register value */
 109         s8 temp_offset[3];      /* Register value */
 110         u16 alarms;             /* Register encoding, combined */
 111         u8 vid;                 /* Register encoding, combined */
 112         u8 vrm;
 113 };
 114
 115 static int smsc47m192_probe(struct i2c_client *client,
 116                             const struct i2c_device_id *id);
 117 static int smsc47m192_detect(struct i2c_client *client,
 118                              struct i2c_board_info *info);
 119 static int smsc47m192_remove(struct i2c_client *client);
 120 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev);
 121
 122 static const struct i2c_device_id smsc47m192_id[] = {
 123         { "smsc47m192", 0 },
 124         { }
 125 };
 126 MODULE_DEVICE_TABLE(i2c, smsc47m192_id);
 127
 128 static struct i2c_driver smsc47m192_driver = {
 129         .class          = I2C_CLASS_HWMON,
 130         .driver = {
 131                 .name   = "smsc47m192",
 132         },
 133         .probe          = smsc47m192_probe,
 134         .remove         = smsc47m192_remove,
 135         .id_table       = smsc47m192_id,
 136         .detect         = smsc47m192_detect,
 137         .address_list   = normal_i2c,
 138 };
 139
 140 /* Voltages */
 141 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
 142                 char *buf)
 143 {
 144         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 145         int nr = sensor_attr->index;
 146         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 147         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
 148 }
 149
 150 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
 151                 char *buf)
 152 {
 153         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 154         int nr = sensor_attr->index;
 155         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 156         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
 157 }
 158
 159 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
 160                 char *buf)
 161 {
 162         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 163         int nr = sensor_attr->index;
 164         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 165         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));
 166 }
 167
 168 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 169                 const char *buf, size_t count)
 170 {
 171         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 172         int nr = sensor_attr->index;
 173         struct i2c_client *client = to_i2c_client(dev);
 174         struct smsc47m192_data *data = i2c_get_clientdata(client);
 175         unsigned long val;
 176         int err;
 177
 178         err = kstrtoul(buf, 10, &val);
 179         if (err)
 180                 return err;
 181
 182         mutex_lock(&data->update_lock);
 183         data->in_min[nr] = IN_TO_REG(val, nr);
 184         i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MIN(nr),
 185                                                         data->in_min[nr]);
 186         mutex_unlock(&data->update_lock);
 187         return count;
 188 }
 189
 190 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 191                 const char *buf, size_t count)
 192 {
 193         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 194         int nr = sensor_attr->index;
 195         struct i2c_client *client = to_i2c_client(dev);
 196         struct smsc47m192_data *data = i2c_get_clientdata(client);
 197         unsigned long val;
 198         int err;
 199
 200         err = kstrtoul(buf, 10, &val);
 201         if (err)
 202                 return err;
 203
 204         mutex_lock(&data->update_lock);
 205         data->in_max[nr] = IN_TO_REG(val, nr);
 206         i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MAX(nr),
 207                                                         data->in_max[nr]);
 208         mutex_unlock(&data->update_lock);
 209         return count;
 210 }
 211
 212 #define show_in_offset(offset)                                  \
 213 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
 214                 show_in, NULL, offset);                         \
 215 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
 216                 show_in_min, set_in_min, offset);               \
 217 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
 218                 show_in_max, set_in_max, offset);
 219
 220 show_in_offset(0)
 221 show_in_offset(1)
 222 show_in_offset(2)
 223 show_in_offset(3)
 224 show_in_offset(4)
 225 show_in_offset(5)
 226 show_in_offset(6)
 227 show_in_offset(7)
 228
 229 /* Temperatures */
 230 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 231                 char *buf)
 232 {
 233         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 234         int nr = sensor_attr->index;
 235         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 236         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
 237 }
 238
 239 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
 240                 char *buf)
 241 {
 242         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 243         int nr = sensor_attr->index;
 244         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 245         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr]));
 246 }
 247
 248 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
 249                 char *buf)
 250 {
 251         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 252         int nr = sensor_attr->index;
 253         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 254         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[nr]));
 255 }
 256
 257 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 258                 const char *buf, size_t count)
 259 {
 260         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 261         int nr = sensor_attr->index;
 262         struct i2c_client *client = to_i2c_client(dev);
 263         struct smsc47m192_data *data = i2c_get_clientdata(client);
 264         long val;
 265         int err;
 266
 267         err = kstrtol(buf, 10, &val);
 268         if (err)
 269                 return err;
 270
 271         mutex_lock(&data->update_lock);
 272         data->temp_min[nr] = TEMP_TO_REG(val);
 273         i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr],
 274                                                 data->temp_min[nr]);
 275         mutex_unlock(&data->update_lock);
 276         return count;
 277 }
 278
 279 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 280                 const char *buf, size_t count)
 281 {
 282         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 283         int nr = sensor_attr->index;
 284         struct i2c_client *client = to_i2c_client(dev);
 285         struct smsc47m192_data *data = i2c_get_clientdata(client);
 286         long val;
 287         int err;
 288
 289         err = kstrtol(buf, 10, &val);
 290         if (err)
 291                 return err;
 292
 293         mutex_lock(&data->update_lock);
 294         data->temp_max[nr] = TEMP_TO_REG(val);
 295         i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr],
 296                                                 data->temp_max[nr]);
 297         mutex_unlock(&data->update_lock);
 298         return count;
 299 }
 300
 301 static ssize_t show_temp_offset(struct device *dev, struct device_attribute
 302                 *attr, char *buf)
 303 {
 304         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 305         int nr = sensor_attr->index;
 306         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 307         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr]));
 308 }
 309
 310 static ssize_t set_temp_offset(struct device *dev, struct device_attribute
 311                 *attr, const char *buf, size_t count)
 312 {
 313         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 314         int nr = sensor_attr->index;
 315         struct i2c_client *client = to_i2c_client(dev);
 316         struct smsc47m192_data *data = i2c_get_clientdata(client);
 317         u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
 318         long val;
 319         int err;
 320
 321         err = kstrtol(buf, 10, &val);
 322         if (err)
 323                 return err;
 324
 325         mutex_lock(&data->update_lock);
 326         data->temp_offset[nr] = TEMP_TO_REG(val);
 327         if (nr > 1)
 328                 i2c_smbus_write_byte_data(client,
 329                         SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
 330         else if (data->temp_offset[nr] != 0) {
 331                 /*
 332                  * offset[0] and offset[1] share the same register,
 333                  * SFR bit 4 activates offset[0]
 334                  */
 335                 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
 336                                         (sfr & 0xef) | (nr == 0 ? 0x10 : 0));
 337                 data->temp_offset[1-nr] = 0;
 338                 i2c_smbus_write_byte_data(client,
 339                         SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
 340         } else if ((sfr & 0x10) == (nr == 0 ? 0x10 : 0))
 341                 i2c_smbus_write_byte_data(client,
 342                                         SMSC47M192_REG_TEMP_OFFSET(nr), 0);
 343         mutex_unlock(&data->update_lock);
 344         return count;
 345 }
 346
 347 #define show_temp_index(index)                                          \
 348 static SENSOR_DEVICE_ATTR(temp##index##_input, S_IRUGO,                 \
 349                 show_temp, NULL, index-1);                              \
 350 static SENSOR_DEVICE_ATTR(temp##index##_min, S_IRUGO | S_IWUSR,         \
 351                 show_temp_min, set_temp_min, index-1);                  \
 352 static SENSOR_DEVICE_ATTR(temp##index##_max, S_IRUGO | S_IWUSR,         \
 353                 show_temp_max, set_temp_max, index-1);                  \
 354 static SENSOR_DEVICE_ATTR(temp##index##_offset, S_IRUGO | S_IWUSR,      \
 355                 show_temp_offset, set_temp_offset, index-1);
 356
 357 show_temp_index(1)
 358 show_temp_index(2)
 359 show_temp_index(3)
 360
 361 /* VID */
 362 static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
 363                 char *buf)
 364 {
 365         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 366         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 367 }
 368 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 369
 370 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
 371                 char *buf)
 372 {
 373         struct smsc47m192_data *data = dev_get_drvdata(dev);
 374         return sprintf(buf, "%d\n", data->vrm);
 375 }
 376
 377 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
 378                 const char *buf, size_t count)
 379 {
 380         struct smsc47m192_data *data = dev_get_drvdata(dev);
 381         unsigned long val;
 382         int err;
 383
 384         err = kstrtoul(buf, 10, &val);
 385         if (err)
 386                 return err;
 387         if (val > 255)
 388                 return -EINVAL;
 389
 390         data->vrm = val;
 391         return count;
 392 }
 393 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 394
 395 /* Alarms */
 396 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 397                 char *buf)
 398 {
 399         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 400         int nr = sensor_attr->index;
 401         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 402         return sprintf(buf, "%u\n", (data->alarms & nr) ? 1 : 0);
 403 }
 404
 405 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0x0010);
 406 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 0x0020);
 407 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0x0040);
 408 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 0x4000);
 409 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 0x8000);
 410 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0x0001);
 411 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0x0002);
 412 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 0x0004);
 413 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 0x0008);
 414 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 0x0100);
 415 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 0x0200);
 416 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 0x0400);
 417 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 0x0800);
 418
 419 static struct attribute *smsc47m192_attributes[] = {
 420         &sensor_dev_attr_in0_input.dev_attr.attr,
 421         &sensor_dev_attr_in0_min.dev_attr.attr,
 422         &sensor_dev_attr_in0_max.dev_attr.attr,
 423         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 424         &sensor_dev_attr_in1_input.dev_attr.attr,
 425         &sensor_dev_attr_in1_min.dev_attr.attr,
 426         &sensor_dev_attr_in1_max.dev_attr.attr,
 427         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 428         &sensor_dev_attr_in2_input.dev_attr.attr,
 429         &sensor_dev_attr_in2_min.dev_attr.attr,
 430         &sensor_dev_attr_in2_max.dev_attr.attr,
 431         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 432         &sensor_dev_attr_in3_input.dev_attr.attr,
 433         &sensor_dev_attr_in3_min.dev_attr.attr,
 434         &sensor_dev_attr_in3_max.dev_attr.attr,
 435         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 436         &sensor_dev_attr_in5_input.dev_attr.attr,
 437         &sensor_dev_attr_in5_min.dev_attr.attr,
 438         &sensor_dev_attr_in5_max.dev_attr.attr,
 439         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 440         &sensor_dev_attr_in6_input.dev_attr.attr,
 441         &sensor_dev_attr_in6_min.dev_attr.attr,
 442         &sensor_dev_attr_in6_max.dev_attr.attr,
 443         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 444         &sensor_dev_attr_in7_input.dev_attr.attr,
 445         &sensor_dev_attr_in7_min.dev_attr.attr,
 446         &sensor_dev_attr_in7_max.dev_attr.attr,
 447         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 448
 449         &sensor_dev_attr_temp1_input.dev_attr.attr,
 450         &sensor_dev_attr_temp1_max.dev_attr.attr,
 451         &sensor_dev_attr_temp1_min.dev_attr.attr,
 452         &sensor_dev_attr_temp1_offset.dev_attr.attr,
 453         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 454         &sensor_dev_attr_temp2_input.dev_attr.attr,
 455         &sensor_dev_attr_temp2_max.dev_attr.attr,
 456         &sensor_dev_attr_temp2_min.dev_attr.attr,
 457         &sensor_dev_attr_temp2_offset.dev_attr.attr,
 458         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 459         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 460         &sensor_dev_attr_temp3_input.dev_attr.attr,
 461         &sensor_dev_attr_temp3_max.dev_attr.attr,
 462         &sensor_dev_attr_temp3_min.dev_attr.attr,
 463         &sensor_dev_attr_temp3_offset.dev_attr.attr,
 464         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 465         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 466
 467         &dev_attr_cpu0_vid.attr,
 468         &dev_attr_vrm.attr,
 469         NULL
 470 };
 471
 472 static const struct attribute_group smsc47m192_group = {
 473         .attrs = smsc47m192_attributes,
 474 };
 475
 476 static struct attribute *smsc47m192_attributes_in4[] = {
 477         &sensor_dev_attr_in4_input.dev_attr.attr,
 478         &sensor_dev_attr_in4_min.dev_attr.attr,
 479         &sensor_dev_attr_in4_max.dev_attr.attr,
 480         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 481         NULL
 482 };
 483
 484 static const struct attribute_group smsc47m192_group_in4 = {
 485         .attrs = smsc47m192_attributes_in4,
 486 };
 487
 488 static void smsc47m192_init_client(struct i2c_client *client)
 489 {
 490         int i;
 491         u8 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
 492         u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
 493
 494         /* select cycle mode (pause 1 sec between updates) */
 495         i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
 496                                                 (sfr & 0xfd) | 0x02);
 497         if (!(config & 0x01)) {
 498                 /* initialize alarm limits */
 499                 for (i = 0; i < 8; i++) {
 500                         i2c_smbus_write_byte_data(client,
 501                                 SMSC47M192_REG_IN_MIN(i), 0);
 502                         i2c_smbus_write_byte_data(client,
 503                                 SMSC47M192_REG_IN_MAX(i), 0xff);
 504                 }
 505                 for (i = 0; i < 3; i++) {
 506                         i2c_smbus_write_byte_data(client,
 507                                 SMSC47M192_REG_TEMP_MIN[i], 0x80);
 508                         i2c_smbus_write_byte_data(client,
 509                                 SMSC47M192_REG_TEMP_MAX[i], 0x7f);
 510                 }
 511
 512                 /* start monitoring */
 513                 i2c_smbus_write_byte_data(client, SMSC47M192_REG_CONFIG,
 514                                                 (config & 0xf7) | 0x01);
 515         }
 516 }
 517
 518 /* Return 0 if detection is successful, -ENODEV otherwise */
 519 static int smsc47m192_detect(struct i2c_client *client,
 520                              struct i2c_board_info *info)
 521 {
 522         struct i2c_adapter *adapter = client->adapter;
 523         int version;
 524
 525         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 526                 return -ENODEV;
 527
 528         /* Detection criteria from sensors_detect script */
 529         version = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VERSION);
 530         if (i2c_smbus_read_byte_data(client,
 531                                 SMSC47M192_REG_COMPANY_ID) == 0x55
 532          && (version & 0xf0) == 0x20
 533          && (i2c_smbus_read_byte_data(client,
 534                                 SMSC47M192_REG_VID) & 0x70) == 0x00
 535          && (i2c_smbus_read_byte_data(client,
 536                                 SMSC47M192_REG_VID4) & 0xfe) == 0x80) {
 537                 dev_info(&adapter->dev,
 538                          "found SMSC47M192 or compatible, "
 539                          "version 2, stepping A%d\n", version & 0x0f);
 540         } else {
 541                 dev_dbg(&adapter->dev,
 542                         "SMSC47M192 detection failed at 0x%02x\n",
 543                         client->addr);
 544                 return -ENODEV;
 545         }
 546
 547         strlcpy(info->type, "smsc47m192", I2C_NAME_SIZE);
 548
 549         return 0;
 550 }
 551
 552 static int smsc47m192_probe(struct i2c_client *client,
 553                             const struct i2c_device_id *id)
 554 {
 555         struct smsc47m192_data *data;
 556         int config;
 557         int err;
 558
 559         data = devm_kzalloc(&client->dev, sizeof(struct smsc47m192_data),
 560                             GFP_KERNEL);
 561         if (!data)
 562                 return -ENOMEM;
 563
 564         i2c_set_clientdata(client, data);
 565         data->vrm = vid_which_vrm();
 566         mutex_init(&data->update_lock);
 567
 568         /* Initialize the SMSC47M192 chip */
 569         smsc47m192_init_client(client);
 570
 571         /* Register sysfs hooks */
 572         err = sysfs_create_group(&client->dev.kobj, &smsc47m192_group);
 573         if (err)
 574                 return err;
 575
 576         /* Pin 110 is either in4 (+12V) or VID4 */
 577         config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
 578         if (!(config & 0x20)) {
 579                 err = sysfs_create_group(&client->dev.kobj,
 580                                          &smsc47m192_group_in4);
 581                 if (err)
 582                         goto exit_remove_files;
 583         }
 584
 585         data->hwmon_dev = hwmon_device_register(&client->dev);
 586         if (IS_ERR(data->hwmon_dev)) {
 587                 err = PTR_ERR(data->hwmon_dev);
 588                 goto exit_remove_files;
 589         }
 590
 591         return 0;
 592
 593 exit_remove_files:
 594         sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);
 595         sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);
 596         return err;
 597 }
 598
 599 static int smsc47m192_remove(struct i2c_client *client)
 600 {
 601         struct smsc47m192_data *data = i2c_get_clientdata(client);
 602
 603         hwmon_device_unregister(data->hwmon_dev);
 604         sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);
 605         sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);
 606
 607         return 0;
 608 }
 609
 610 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev)
 611 {
 612         struct i2c_client *client = to_i2c_client(dev);
 613         struct smsc47m192_data *data = i2c_get_clientdata(client);
 614         int i, config;
 615
 616         mutex_lock(&data->update_lock);
 617
 618         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 619          || !data->valid) {
 620                 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
 621
 622                 dev_dbg(&client->dev, "Starting smsc47m192 update\n");
 623
 624                 for (i = 0; i <= 7; i++) {
 625                         data->in[i] = i2c_smbus_read_byte_data(client,
 626                                                 SMSC47M192_REG_IN(i));
 627                         data->in_min[i] = i2c_smbus_read_byte_data(client,
 628                                                 SMSC47M192_REG_IN_MIN(i));
 629                         data->in_max[i] = i2c_smbus_read_byte_data(client,
 630                                                 SMSC47M192_REG_IN_MAX(i));
 631                 }
 632                 for (i = 0; i < 3; i++) {
 633                         data->temp[i] = i2c_smbus_read_byte_data(client,
 634                                                 SMSC47M192_REG_TEMP[i]);
 635                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
 636                                                 SMSC47M192_REG_TEMP_MAX[i]);
 637                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
 638                                                 SMSC47M192_REG_TEMP_MIN[i]);
 639                 }
 640                 for (i = 1; i < 3; i++)
 641                         data->temp_offset[i] = i2c_smbus_read_byte_data(client,
 642                                                 SMSC47M192_REG_TEMP_OFFSET(i));
 643                 /*
 644                  * first offset is temp_offset[0] if SFR bit 4 is set,
 645                  * temp_offset[1] otherwise
 646                  */
 647                 if (sfr & 0x10) {
 648                         data->temp_offset[0] = data->temp_offset[1];
 649                         data->temp_offset[1] = 0;
 650                 } else
 651                         data->temp_offset[0] = 0;
 652
 653                 data->vid = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VID)
 654                             & 0x0f;
 655                 config = i2c_smbus_read_byte_data(client,
 656                                                   SMSC47M192_REG_CONFIG);
 657                 if (config & 0x20)
 658                         data->vid |= (i2c_smbus_read_byte_data(client,
 659                                         SMSC47M192_REG_VID4) & 0x01) << 4;
 660                 data->alarms = i2c_smbus_read_byte_data(client,
 661                                                 SMSC47M192_REG_ALARM1) |
 662                                (i2c_smbus_read_byte_data(client,
 663                                                 SMSC47M192_REG_ALARM2) << 8);
 664
 665                 data->last_updated = jiffies;
 666                 data->valid = 1;
 667         }
 668
 669         mutex_unlock(&data->update_lock);
 670
 671         return data;
 672 }
 673
 674 module_i2c_driver(smsc47m192_driver);
 675
 676 MODULE_AUTHOR("Hartmut Rick <linux@rick.claranet.de>");
 677 MODULE_DESCRIPTION("SMSC47M192 driver");
 678 MODULE_LICENSE("GPL");