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 /* Insmod parameters */
  40 I2C_CLIENT_INSMOD_1(smsc47m192);
  41
  42 /* SMSC47M192 registers */
  43 #define SMSC47M192_REG_IN(nr)           ((nr)<6 ? (0x20 + (nr)) : \
  44                                         (0x50 + (nr) - 6))
  45 #define SMSC47M192_REG_IN_MAX(nr)       ((nr)<6 ? (0x2b + (nr) * 2) : \
  46                                         (0x54 + (((nr) - 6) * 2)))
  47 #define SMSC47M192_REG_IN_MIN(nr)       ((nr)<6 ? (0x2c + (nr) * 2) : \
  48                                         (0x55 + (((nr) - 6) * 2)))
  49 static u8 SMSC47M192_REG_TEMP[3] =      { 0x27, 0x26, 0x52 };
  50 static u8 SMSC47M192_REG_TEMP_MAX[3] =  { 0x39, 0x37, 0x58 };
  51 static u8 SMSC47M192_REG_TEMP_MIN[3] =  { 0x3A, 0x38, 0x59 };
  52 #define SMSC47M192_REG_TEMP_OFFSET(nr)  ((nr)==2 ? 0x1e : 0x1f)
  53 #define SMSC47M192_REG_ALARM1           0x41
  54 #define SMSC47M192_REG_ALARM2           0x42
  55 #define SMSC47M192_REG_VID              0x47
  56 #define SMSC47M192_REG_VID4             0x49
  57 #define SMSC47M192_REG_CONFIG           0x40
  58 #define SMSC47M192_REG_SFR              0x4f
  59 #define SMSC47M192_REG_COMPANY_ID       0x3e
  60 #define SMSC47M192_REG_VERSION          0x3f
  61
  62 /* generalised scaling with integer rounding */
  63 static inline int SCALE(long val, int mul, int div)
  64 {
  65         if (val < 0)
  66                 return (val * mul - div / 2) / div;
  67         else
  68                 return (val * mul + div / 2) / div;
  69 }
  70
  71 /* Conversions */
  72
  73 /* smsc47m192 internally scales voltage measurements */
  74 static const u16 nom_mv[] = { 2500, 2250, 3300, 5000, 12000, 3300, 1500, 1800 };
  75
  76 static inline unsigned int IN_FROM_REG(u8 reg, int n)
  77 {
  78         return SCALE(reg, nom_mv[n], 192);
  79 }
  80
  81 static inline u8 IN_TO_REG(unsigned long val, int n)
  82 {
  83         return SENSORS_LIMIT(SCALE(val, 192, nom_mv[n]), 0, 255);
  84 }
  85
  86 /* TEMP: 0.001 degC units (-128C to +127C)
  87    REG: 1C/bit, two's complement */
  88 static inline s8 TEMP_TO_REG(int val)
  89 {
  90         return SENSORS_LIMIT(SCALE(val, 1, 1000), -128000, 127000);
  91 }
  92
  93 static inline int TEMP_FROM_REG(s8 val)
  94 {
  95         return val * 1000;
  96 }
  97
  98 struct smsc47m192_data {
  99         struct device *hwmon_dev;
 100         struct mutex update_lock;
 101         char valid;             /* !=0 if following fields are valid */
 102         unsigned long last_updated;     /* In jiffies */
 103
 104         u8 in[8];               /* Register value */
 105         u8 in_max[8];           /* Register value */
 106         u8 in_min[8];           /* Register value */
 107         s8 temp[3];             /* Register value */
 108         s8 temp_max[3];         /* Register value */
 109         s8 temp_min[3];         /* Register value */
 110         s8 temp_offset[3];      /* Register value */
 111         u16 alarms;             /* Register encoding, combined */
 112         u8 vid;                 /* Register encoding, combined */
 113         u8 vrm;
 114 };
 115
 116 static int smsc47m192_probe(struct i2c_client *client,
 117                             const struct i2c_device_id *id);
 118 static int smsc47m192_detect(struct i2c_client *client, int kind,
 119                              struct i2c_board_info *info);
 120 static int smsc47m192_remove(struct i2c_client *client);
 121 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev);
 122
 123 static const struct i2c_device_id smsc47m192_id[] = {
 124         { "smsc47m192", smsc47m192 },
 125         { }
 126 };
 127 MODULE_DEVICE_TABLE(i2c, smsc47m192_id);
 128
 129 static struct i2c_driver smsc47m192_driver = {
 130         .class          = I2C_CLASS_HWMON,
 131         .driver = {
 132                 .name   = "smsc47m192",
 133         },
 134         .probe          = smsc47m192_probe,
 135         .remove         = smsc47m192_remove,
 136         .id_table       = smsc47m192_id,
 137         .detect         = smsc47m192_detect,
 138         .address_data   = &addr_data,
 139 };
 140
 141 /* Voltages */
 142 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
 143                 char *buf)
 144 {
 145         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 146         int nr = sensor_attr->index;
 147         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 148         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
 149 }
 150
 151 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
 152                 char *buf)
 153 {
 154         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 155         int nr = sensor_attr->index;
 156         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 157         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
 158 }
 159
 160 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
 161                 char *buf)
 162 {
 163         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 164         int nr = sensor_attr->index;
 165         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 166         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));
 167 }
 168
 169 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 170                 const char *buf, size_t count)
 171 {
 172         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 173         int nr = sensor_attr->index;
 174         struct i2c_client *client = to_i2c_client(dev);
 175         struct smsc47m192_data *data = i2c_get_clientdata(client);
 176         unsigned long val = simple_strtoul(buf, NULL, 10);
 177
 178         mutex_lock(&data->update_lock);
 179         data->in_min[nr] = IN_TO_REG(val, nr);
 180         i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MIN(nr),
 181                                                         data->in_min[nr]);
 182         mutex_unlock(&data->update_lock);
 183         return count;
 184 }
 185
 186 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 187                 const char *buf, size_t count)
 188 {
 189         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 190         int nr = sensor_attr->index;
 191         struct i2c_client *client = to_i2c_client(dev);
 192         struct smsc47m192_data *data = i2c_get_clientdata(client);
 193         unsigned long val = simple_strtoul(buf, NULL, 10);
 194
 195         mutex_lock(&data->update_lock);
 196         data->in_max[nr] = IN_TO_REG(val, nr);
 197         i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MAX(nr),
 198                                                         data->in_max[nr]);
 199         mutex_unlock(&data->update_lock);
 200         return count;
 201 }
 202
 203 #define show_in_offset(offset)                                  \
 204 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
 205                 show_in, NULL, offset);                         \
 206 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
 207                 show_in_min, set_in_min, offset);               \
 208 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
 209                 show_in_max, set_in_max, offset);
 210
 211 show_in_offset(0)
 212 show_in_offset(1)
 213 show_in_offset(2)
 214 show_in_offset(3)
 215 show_in_offset(4)
 216 show_in_offset(5)
 217 show_in_offset(6)
 218 show_in_offset(7)
 219
 220 /* Temperatures */
 221 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 222                 char *buf)
 223 {
 224         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 225         int nr = sensor_attr->index;
 226         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 227         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
 228 }
 229
 230 static ssize_t show_temp_min(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_min[nr]));
 237 }
 238
 239 static ssize_t show_temp_max(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_max[nr]));
 246 }
 247
 248 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 249                 const char *buf, size_t count)
 250 {
 251         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 252         int nr = sensor_attr->index;
 253         struct i2c_client *client = to_i2c_client(dev);
 254         struct smsc47m192_data *data = i2c_get_clientdata(client);
 255         long val = simple_strtol(buf, NULL, 10);
 256
 257         mutex_lock(&data->update_lock);
 258         data->temp_min[nr] = TEMP_TO_REG(val);
 259         i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr],
 260                                                 data->temp_min[nr]);
 261         mutex_unlock(&data->update_lock);
 262         return count;
 263 }
 264
 265 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 266                 const char *buf, size_t count)
 267 {
 268         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 269         int nr = sensor_attr->index;
 270         struct i2c_client *client = to_i2c_client(dev);
 271         struct smsc47m192_data *data = i2c_get_clientdata(client);
 272         long val = simple_strtol(buf, NULL, 10);
 273
 274         mutex_lock(&data->update_lock);
 275         data->temp_max[nr] = TEMP_TO_REG(val);
 276         i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr],
 277                                                 data->temp_max[nr]);
 278         mutex_unlock(&data->update_lock);
 279         return count;
 280 }
 281
 282 static ssize_t show_temp_offset(struct device *dev, struct device_attribute
 283                 *attr, char *buf)
 284 {
 285         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 286         int nr = sensor_attr->index;
 287         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 288         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr]));
 289 }
 290
 291 static ssize_t set_temp_offset(struct device *dev, struct device_attribute
 292                 *attr, const char *buf, size_t count)
 293 {
 294         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 295         int nr = sensor_attr->index;
 296         struct i2c_client *client = to_i2c_client(dev);
 297         struct smsc47m192_data *data = i2c_get_clientdata(client);
 298         u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
 299         long val = simple_strtol(buf, NULL, 10);
 300
 301         mutex_lock(&data->update_lock);
 302         data->temp_offset[nr] = TEMP_TO_REG(val);
 303         if (nr>1)
 304                 i2c_smbus_write_byte_data(client,
 305                         SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
 306         else if (data->temp_offset[nr] != 0) {
 307                 /* offset[0] and offset[1] share the same register,
 308                         SFR bit 4 activates offset[0] */
 309                 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
 310                                         (sfr & 0xef) | (nr==0 ? 0x10 : 0));
 311                 data->temp_offset[1-nr] = 0;
 312                 i2c_smbus_write_byte_data(client,
 313                         SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
 314         } else if ((sfr & 0x10) == (nr==0 ? 0x10 : 0))
 315                 i2c_smbus_write_byte_data(client,
 316                                         SMSC47M192_REG_TEMP_OFFSET(nr), 0);
 317         mutex_unlock(&data->update_lock);
 318         return count;
 319 }
 320
 321 #define show_temp_index(index)                                          \
 322 static SENSOR_DEVICE_ATTR(temp##index##_input, S_IRUGO,                 \
 323                 show_temp, NULL, index-1);                              \
 324 static SENSOR_DEVICE_ATTR(temp##index##_min, S_IRUGO | S_IWUSR,         \
 325                 show_temp_min, set_temp_min, index-1);                  \
 326 static SENSOR_DEVICE_ATTR(temp##index##_max, S_IRUGO | S_IWUSR,         \
 327                 show_temp_max, set_temp_max, index-1);                  \
 328 static SENSOR_DEVICE_ATTR(temp##index##_offset, S_IRUGO | S_IWUSR,      \
 329                 show_temp_offset, set_temp_offset, index-1);
 330
 331 show_temp_index(1)
 332 show_temp_index(2)
 333 show_temp_index(3)
 334
 335 /* VID */
 336 static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
 337                 char *buf)
 338 {
 339         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 340         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 341 }
 342 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 343
 344 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
 345                 char *buf)
 346 {
 347         struct smsc47m192_data *data = dev_get_drvdata(dev);
 348         return sprintf(buf, "%d\n", data->vrm);
 349 }
 350
 351 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
 352                 const char *buf, size_t count)
 353 {
 354         struct smsc47m192_data *data = dev_get_drvdata(dev);
 355         data->vrm = simple_strtoul(buf, NULL, 10);
 356         return count;
 357 }
 358 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 359
 360 /* Alarms */
 361 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 362                 char *buf)
 363 {
 364         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 365         int nr = sensor_attr->index;
 366         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 367         return sprintf(buf, "%u\n", (data->alarms & nr) ? 1 : 0);
 368 }
 369
 370 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0x0010);
 371 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 0x0020);
 372 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0x0040);
 373 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 0x4000);
 374 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 0x8000);
 375 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0x0001);
 376 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0x0002);
 377 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 0x0004);
 378 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 0x0008);
 379 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 0x0100);
 380 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 0x0200);
 381 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 0x0400);
 382 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 0x0800);
 383
 384 static struct attribute *smsc47m192_attributes[] = {
 385         &sensor_dev_attr_in0_input.dev_attr.attr,
 386         &sensor_dev_attr_in0_min.dev_attr.attr,
 387         &sensor_dev_attr_in0_max.dev_attr.attr,
 388         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 389         &sensor_dev_attr_in1_input.dev_attr.attr,
 390         &sensor_dev_attr_in1_min.dev_attr.attr,
 391         &sensor_dev_attr_in1_max.dev_attr.attr,
 392         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 393         &sensor_dev_attr_in2_input.dev_attr.attr,
 394         &sensor_dev_attr_in2_min.dev_attr.attr,
 395         &sensor_dev_attr_in2_max.dev_attr.attr,
 396         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 397         &sensor_dev_attr_in3_input.dev_attr.attr,
 398         &sensor_dev_attr_in3_min.dev_attr.attr,
 399         &sensor_dev_attr_in3_max.dev_attr.attr,
 400         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 401         &sensor_dev_attr_in5_input.dev_attr.attr,
 402         &sensor_dev_attr_in5_min.dev_attr.attr,
 403         &sensor_dev_attr_in5_max.dev_attr.attr,
 404         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 405         &sensor_dev_attr_in6_input.dev_attr.attr,
 406         &sensor_dev_attr_in6_min.dev_attr.attr,
 407         &sensor_dev_attr_in6_max.dev_attr.attr,
 408         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 409         &sensor_dev_attr_in7_input.dev_attr.attr,
 410         &sensor_dev_attr_in7_min.dev_attr.attr,
 411         &sensor_dev_attr_in7_max.dev_attr.attr,
 412         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 413
 414         &sensor_dev_attr_temp1_input.dev_attr.attr,
 415         &sensor_dev_attr_temp1_max.dev_attr.attr,
 416         &sensor_dev_attr_temp1_min.dev_attr.attr,
 417         &sensor_dev_attr_temp1_offset.dev_attr.attr,
 418         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 419         &sensor_dev_attr_temp2_input.dev_attr.attr,
 420         &sensor_dev_attr_temp2_max.dev_attr.attr,
 421         &sensor_dev_attr_temp2_min.dev_attr.attr,
 422         &sensor_dev_attr_temp2_offset.dev_attr.attr,
 423         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 424         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 425         &sensor_dev_attr_temp3_input.dev_attr.attr,
 426         &sensor_dev_attr_temp3_max.dev_attr.attr,
 427         &sensor_dev_attr_temp3_min.dev_attr.attr,
 428         &sensor_dev_attr_temp3_offset.dev_attr.attr,
 429         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 430         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 431
 432         &dev_attr_cpu0_vid.attr,
 433         &dev_attr_vrm.attr,
 434         NULL
 435 };
 436
 437 static const struct attribute_group smsc47m192_group = {
 438         .attrs = smsc47m192_attributes,
 439 };
 440
 441 static struct attribute *smsc47m192_attributes_in4[] = {
 442         &sensor_dev_attr_in4_input.dev_attr.attr,
 443         &sensor_dev_attr_in4_min.dev_attr.attr,
 444         &sensor_dev_attr_in4_max.dev_attr.attr,
 445         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 446         NULL
 447 };
 448
 449 static const struct attribute_group smsc47m192_group_in4 = {
 450         .attrs = smsc47m192_attributes_in4,
 451 };
 452
 453 static void smsc47m192_init_client(struct i2c_client *client)
 454 {
 455         int i;
 456         u8 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
 457         u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
 458
 459         /* select cycle mode (pause 1 sec between updates) */
 460         i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
 461                                                 (sfr & 0xfd) | 0x02);
 462         if (!(config & 0x01)) {
 463                 /* initialize alarm limits */
 464                 for (i=0; i<8; i++) {
 465                         i2c_smbus_write_byte_data(client,
 466                                 SMSC47M192_REG_IN_MIN(i), 0);
 467                         i2c_smbus_write_byte_data(client,
 468                                 SMSC47M192_REG_IN_MAX(i), 0xff);
 469                 }
 470                 for (i=0; i<3; i++) {
 471                         i2c_smbus_write_byte_data(client,
 472                                 SMSC47M192_REG_TEMP_MIN[i], 0x80);
 473                         i2c_smbus_write_byte_data(client,
 474                                 SMSC47M192_REG_TEMP_MAX[i], 0x7f);
 475                 }
 476
 477                 /* start monitoring */
 478                 i2c_smbus_write_byte_data(client, SMSC47M192_REG_CONFIG,
 479                                                 (config & 0xf7) | 0x01);
 480         }
 481 }
 482
 483 /* Return 0 if detection is successful, -ENODEV otherwise */
 484 static int smsc47m192_detect(struct i2c_client *client, int kind,
 485                              struct i2c_board_info *info)
 486 {
 487         struct i2c_adapter *adapter = client->adapter;
 488         int version;
 489
 490         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 491                 return -ENODEV;
 492
 493         /* Detection criteria from sensors_detect script */
 494         if (kind < 0) {
 495                 if (i2c_smbus_read_byte_data(client,
 496                                 SMSC47M192_REG_COMPANY_ID) == 0x55
 497                  && ((version = i2c_smbus_read_byte_data(client,
 498                                 SMSC47M192_REG_VERSION)) & 0xf0) == 0x20
 499                  && (i2c_smbus_read_byte_data(client,
 500                                 SMSC47M192_REG_VID) & 0x70) == 0x00
 501                  && (i2c_smbus_read_byte_data(client,
 502                                 SMSC47M192_REG_VID4) & 0xfe) == 0x80) {
 503                         dev_info(&adapter->dev,
 504                                  "found SMSC47M192 or compatible, "
 505                                  "version 2, stepping A%d\n", version & 0x0f);
 506                 } else {
 507                         dev_dbg(&adapter->dev,
 508                                 "SMSC47M192 detection failed at 0x%02x\n",
 509                                 client->addr);
 510                         return -ENODEV;
 511                 }
 512         }
 513
 514         strlcpy(info->type, "smsc47m192", I2C_NAME_SIZE);
 515
 516         return 0;
 517 }
 518
 519 static int smsc47m192_probe(struct i2c_client *client,
 520                             const struct i2c_device_id *id)
 521 {
 522         struct smsc47m192_data *data;
 523         int config;
 524         int err;
 525
 526         data = kzalloc(sizeof(struct smsc47m192_data), GFP_KERNEL);
 527         if (!data) {
 528                 err = -ENOMEM;
 529                 goto exit;
 530         }
 531
 532         i2c_set_clientdata(client, data);
 533         data->vrm = vid_which_vrm();
 534         mutex_init(&data->update_lock);
 535
 536         /* Initialize the SMSC47M192 chip */
 537         smsc47m192_init_client(client);
 538
 539         /* Register sysfs hooks */
 540         if ((err = sysfs_create_group(&client->dev.kobj, &smsc47m192_group)))
 541                 goto exit_free;
 542
 543         /* Pin 110 is either in4 (+12V) or VID4 */
 544         config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
 545         if (!(config & 0x20)) {
 546                 if ((err = sysfs_create_group(&client->dev.kobj,
 547                                               &smsc47m192_group_in4)))
 548                         goto exit_remove_files;
 549         }
 550
 551         data->hwmon_dev = hwmon_device_register(&client->dev);
 552         if (IS_ERR(data->hwmon_dev)) {
 553                 err = PTR_ERR(data->hwmon_dev);
 554                 goto exit_remove_files;
 555         }
 556
 557         return 0;
 558
 559 exit_remove_files:
 560         sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);
 561         sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);
 562 exit_free:
 563         kfree(data);
 564 exit:
 565         return err;
 566 }
 567
 568 static int smsc47m192_remove(struct i2c_client *client)
 569 {
 570         struct smsc47m192_data *data = i2c_get_clientdata(client);
 571
 572         hwmon_device_unregister(data->hwmon_dev);
 573         sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);
 574         sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);
 575
 576         kfree(data);
 577
 578         return 0;
 579 }
 580
 581 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev)
 582 {
 583         struct i2c_client *client = to_i2c_client(dev);
 584         struct smsc47m192_data *data = i2c_get_clientdata(client);
 585         int i, config;
 586
 587         mutex_lock(&data->update_lock);
 588
 589         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 590          || !data->valid) {
 591                 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
 592
 593                 dev_dbg(&client->dev, "Starting smsc47m192 update\n");
 594
 595                 for (i = 0; i <= 7; i++) {
 596                         data->in[i] = i2c_smbus_read_byte_data(client,
 597                                                 SMSC47M192_REG_IN(i));
 598                         data->in_min[i] = i2c_smbus_read_byte_data(client,
 599                                                 SMSC47M192_REG_IN_MIN(i));
 600                         data->in_max[i] = i2c_smbus_read_byte_data(client,
 601                                                 SMSC47M192_REG_IN_MAX(i));
 602                 }
 603                 for (i = 0; i < 3; i++) {
 604                         data->temp[i] = i2c_smbus_read_byte_data(client,
 605                                                 SMSC47M192_REG_TEMP[i]);
 606                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
 607                                                 SMSC47M192_REG_TEMP_MAX[i]);
 608                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
 609                                                 SMSC47M192_REG_TEMP_MIN[i]);
 610                 }
 611                 for (i = 1; i < 3; i++)
 612                         data->temp_offset[i] = i2c_smbus_read_byte_data(client,
 613                                                 SMSC47M192_REG_TEMP_OFFSET(i));
 614                 /* first offset is temp_offset[0] if SFR bit 4 is set,
 615                                         temp_offset[1] otherwise */
 616                 if (sfr & 0x10) {
 617                         data->temp_offset[0] = data->temp_offset[1];
 618                         data->temp_offset[1] = 0;
 619                 } else
 620                         data->temp_offset[0] = 0;
 621
 622                 data->vid = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VID)
 623                             & 0x0f;
 624                 config = i2c_smbus_read_byte_data(client,
 625                                                   SMSC47M192_REG_CONFIG);
 626                 if (config & 0x20)
 627                         data->vid |= (i2c_smbus_read_byte_data(client,
 628                                         SMSC47M192_REG_VID4) & 0x01) << 4;
 629                 data->alarms = i2c_smbus_read_byte_data(client,
 630                                                 SMSC47M192_REG_ALARM1) |
 631                                (i2c_smbus_read_byte_data(client,
 632                                                 SMSC47M192_REG_ALARM2) << 8);
 633
 634                 data->last_updated = jiffies;
 635                 data->valid = 1;
 636         }
 637
 638         mutex_unlock(&data->update_lock);
 639
 640         return data;
 641 }
 642
 643 static int __init smsc47m192_init(void)
 644 {
 645         return i2c_add_driver(&smsc47m192_driver);
 646 }
 647
 648 static void __exit smsc47m192_exit(void)
 649 {
 650         i2c_del_driver(&smsc47m192_driver);
 651 }
 652
 653 MODULE_AUTHOR("Hartmut Rick <linux@rick.claranet.de>");
 654 MODULE_DESCRIPTION("SMSC47M192 driver");
 655 MODULE_LICENSE("GPL");
 656
 657 module_init(smsc47m192_init);
 658 module_exit(smsc47m192_exit);