git.oblomov.eu Git - linux-2.6/blob - 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 i2c_client client;
 100         struct device *hwmon_dev;
 101         struct mutex update_lock;
 102         char valid;             /* !=0 if following fields are valid */
 103         unsigned long last_updated;     /* In jiffies */
 104
 105         u8 in[8];               /* Register value */
 106         u8 in_max[8];           /* Register value */
 107         u8 in_min[8];           /* Register value */
 108         s8 temp[3];             /* Register value */
 109         s8 temp_max[3];         /* Register value */
 110         s8 temp_min[3];         /* Register value */
 111         s8 temp_offset[3];      /* Register value */
 112         u16 alarms;             /* Register encoding, combined */
 113         u8 vid;                 /* Register encoding, combined */
 114         u8 vrm;
 115 };
 116
 117 static int smsc47m192_attach_adapter(struct i2c_adapter *adapter);
 118 static int smsc47m192_detect(struct i2c_adapter *adapter, int address,
 119                 int kind);
 120 static int smsc47m192_detach_client(struct i2c_client *client);
 121 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev);
 122
 123 static struct i2c_driver smsc47m192_driver = {
 124         .driver = {
 125                 .name   = "smsc47m192",
 126         },
 127         .attach_adapter = smsc47m192_attach_adapter,
 128         .detach_client  = smsc47m192_detach_client,
 129 };
 130
 131 /* Voltages */
 132 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
 133                 char *buf)
 134 {
 135         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 136         int nr = sensor_attr->index;
 137         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 138         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
 139 }
 140
 141 static ssize_t show_in_min(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_min[nr], nr));
 148 }
 149
 150 static ssize_t show_in_max(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_max[nr], nr));
 157 }
 158
 159 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 160                 const char *buf, size_t count)
 161 {
 162         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 163         int nr = sensor_attr->index;
 164         struct i2c_client *client = to_i2c_client(dev);
 165         struct smsc47m192_data *data = i2c_get_clientdata(client);
 166         unsigned long val = simple_strtoul(buf, NULL, 10);
 167
 168         mutex_lock(&data->update_lock);
 169         data->in_min[nr] = IN_TO_REG(val, nr);
 170         i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MIN(nr),
 171                                                         data->in_min[nr]);
 172         mutex_unlock(&data->update_lock);
 173         return count;
 174 }
 175
 176 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 177                 const char *buf, size_t count)
 178 {
 179         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 180         int nr = sensor_attr->index;
 181         struct i2c_client *client = to_i2c_client(dev);
 182         struct smsc47m192_data *data = i2c_get_clientdata(client);
 183         unsigned long val = simple_strtoul(buf, NULL, 10);
 184
 185         mutex_lock(&data->update_lock);
 186         data->in_max[nr] = IN_TO_REG(val, nr);
 187         i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MAX(nr),
 188                                                         data->in_max[nr]);
 189         mutex_unlock(&data->update_lock);
 190         return count;
 191 }
 192
 193 #define show_in_offset(offset)                                  \
 194 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
 195                 show_in, NULL, offset);                         \
 196 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
 197                 show_in_min, set_in_min, offset);               \
 198 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
 199                 show_in_max, set_in_max, offset);
 200
 201 show_in_offset(0)
 202 show_in_offset(1)
 203 show_in_offset(2)
 204 show_in_offset(3)
 205 show_in_offset(4)
 206 show_in_offset(5)
 207 show_in_offset(6)
 208 show_in_offset(7)
 209
 210 /* Temperatures */
 211 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 212                 char *buf)
 213 {
 214         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 215         int nr = sensor_attr->index;
 216         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 217         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
 218 }
 219
 220 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
 221                 char *buf)
 222 {
 223         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 224         int nr = sensor_attr->index;
 225         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 226         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr]));
 227 }
 228
 229 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
 230                 char *buf)
 231 {
 232         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 233         int nr = sensor_attr->index;
 234         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 235         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[nr]));
 236 }
 237
 238 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 239                 const char *buf, size_t count)
 240 {
 241         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 242         int nr = sensor_attr->index;
 243         struct i2c_client *client = to_i2c_client(dev);
 244         struct smsc47m192_data *data = i2c_get_clientdata(client);
 245         long val = simple_strtol(buf, NULL, 10);
 246
 247         mutex_lock(&data->update_lock);
 248         data->temp_min[nr] = TEMP_TO_REG(val);
 249         i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr],
 250                                                 data->temp_min[nr]);
 251         mutex_unlock(&data->update_lock);
 252         return count;
 253 }
 254
 255 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 256                 const char *buf, size_t count)
 257 {
 258         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 259         int nr = sensor_attr->index;
 260         struct i2c_client *client = to_i2c_client(dev);
 261         struct smsc47m192_data *data = i2c_get_clientdata(client);
 262         long val = simple_strtol(buf, NULL, 10);
 263
 264         mutex_lock(&data->update_lock);
 265         data->temp_max[nr] = TEMP_TO_REG(val);
 266         i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr],
 267                                                 data->temp_max[nr]);
 268         mutex_unlock(&data->update_lock);
 269         return count;
 270 }
 271
 272 static ssize_t show_temp_offset(struct device *dev, struct device_attribute
 273                 *attr, char *buf)
 274 {
 275         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 276         int nr = sensor_attr->index;
 277         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 278         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr]));
 279 }
 280
 281 static ssize_t set_temp_offset(struct device *dev, struct device_attribute
 282                 *attr, const char *buf, size_t count)
 283 {
 284         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 285         int nr = sensor_attr->index;
 286         struct i2c_client *client = to_i2c_client(dev);
 287         struct smsc47m192_data *data = i2c_get_clientdata(client);
 288         u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
 289         long val = simple_strtol(buf, NULL, 10);
 290
 291         mutex_lock(&data->update_lock);
 292         data->temp_offset[nr] = TEMP_TO_REG(val);
 293         if (nr>1)
 294                 i2c_smbus_write_byte_data(client,
 295                         SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
 296         else if (data->temp_offset[nr] != 0) {
 297                 /* offset[0] and offset[1] share the same register,
 298                         SFR bit 4 activates offset[0] */
 299                 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
 300                                         (sfr & 0xef) | (nr==0 ? 0x10 : 0));
 301                 data->temp_offset[1-nr] = 0;
 302                 i2c_smbus_write_byte_data(client,
 303                         SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
 304         } else if ((sfr & 0x10) == (nr==0 ? 0x10 : 0))
 305                 i2c_smbus_write_byte_data(client,
 306                                         SMSC47M192_REG_TEMP_OFFSET(nr), 0);
 307         mutex_unlock(&data->update_lock);
 308         return count;
 309 }
 310
 311 #define show_temp_index(index)                                          \
 312 static SENSOR_DEVICE_ATTR(temp##index##_input, S_IRUGO,                 \
 313                 show_temp, NULL, index-1);                              \
 314 static SENSOR_DEVICE_ATTR(temp##index##_min, S_IRUGO | S_IWUSR,         \
 315                 show_temp_min, set_temp_min, index-1);                  \
 316 static SENSOR_DEVICE_ATTR(temp##index##_max, S_IRUGO | S_IWUSR,         \
 317                 show_temp_max, set_temp_max, index-1);                  \
 318 static SENSOR_DEVICE_ATTR(temp##index##_offset, S_IRUGO | S_IWUSR,      \
 319                 show_temp_offset, set_temp_offset, index-1);
 320
 321 show_temp_index(1)
 322 show_temp_index(2)
 323 show_temp_index(3)
 324
 325 /* VID */
 326 static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
 327                 char *buf)
 328 {
 329         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 330         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 331 }
 332 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 333
 334 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
 335                 char *buf)
 336 {
 337         struct smsc47m192_data *data = dev_get_drvdata(dev);
 338         return sprintf(buf, "%d\n", data->vrm);
 339 }
 340
 341 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
 342                 const char *buf, size_t count)
 343 {
 344         struct smsc47m192_data *data = dev_get_drvdata(dev);
 345         data->vrm = simple_strtoul(buf, NULL, 10);
 346         return count;
 347 }
 348 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 349
 350 /* Alarms */
 351 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 352                 char *buf)
 353 {
 354         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 355         int nr = sensor_attr->index;
 356         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 357         return sprintf(buf, "%u\n", (data->alarms & nr) ? 1 : 0);
 358 }
 359
 360 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0x0010);
 361 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 0x0020);
 362 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0x0040);
 363 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 0x4000);
 364 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 0x8000);
 365 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0x0001);
 366 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0x0002);
 367 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 0x0004);
 368 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 0x0008);
 369 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 0x0100);
 370 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 0x0200);
 371 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 0x0400);
 372 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 0x0800);
 373
 374 static struct attribute *smsc47m192_attributes[] = {
 375         &sensor_dev_attr_in0_input.dev_attr.attr,
 376         &sensor_dev_attr_in0_min.dev_attr.attr,
 377         &sensor_dev_attr_in0_max.dev_attr.attr,
 378         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 379         &sensor_dev_attr_in1_input.dev_attr.attr,
 380         &sensor_dev_attr_in1_min.dev_attr.attr,
 381         &sensor_dev_attr_in1_max.dev_attr.attr,
 382         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 383         &sensor_dev_attr_in2_input.dev_attr.attr,
 384         &sensor_dev_attr_in2_min.dev_attr.attr,
 385         &sensor_dev_attr_in2_max.dev_attr.attr,
 386         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 387         &sensor_dev_attr_in3_input.dev_attr.attr,
 388         &sensor_dev_attr_in3_min.dev_attr.attr,
 389         &sensor_dev_attr_in3_max.dev_attr.attr,
 390         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 391         &sensor_dev_attr_in5_input.dev_attr.attr,
 392         &sensor_dev_attr_in5_min.dev_attr.attr,
 393         &sensor_dev_attr_in5_max.dev_attr.attr,
 394         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 395         &sensor_dev_attr_in6_input.dev_attr.attr,
 396         &sensor_dev_attr_in6_min.dev_attr.attr,
 397         &sensor_dev_attr_in6_max.dev_attr.attr,
 398         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 399         &sensor_dev_attr_in7_input.dev_attr.attr,
 400         &sensor_dev_attr_in7_min.dev_attr.attr,
 401         &sensor_dev_attr_in7_max.dev_attr.attr,
 402         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 403
 404         &sensor_dev_attr_temp1_input.dev_attr.attr,
 405         &sensor_dev_attr_temp1_max.dev_attr.attr,
 406         &sensor_dev_attr_temp1_min.dev_attr.attr,
 407         &sensor_dev_attr_temp1_offset.dev_attr.attr,
 408         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 409         &sensor_dev_attr_temp2_input.dev_attr.attr,
 410         &sensor_dev_attr_temp2_max.dev_attr.attr,
 411         &sensor_dev_attr_temp2_min.dev_attr.attr,
 412         &sensor_dev_attr_temp2_offset.dev_attr.attr,
 413         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 414         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 415         &sensor_dev_attr_temp3_input.dev_attr.attr,
 416         &sensor_dev_attr_temp3_max.dev_attr.attr,
 417         &sensor_dev_attr_temp3_min.dev_attr.attr,
 418         &sensor_dev_attr_temp3_offset.dev_attr.attr,
 419         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 420         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 421
 422         &dev_attr_cpu0_vid.attr,
 423         &dev_attr_vrm.attr,
 424         NULL
 425 };
 426
 427 static const struct attribute_group smsc47m192_group = {
 428         .attrs = smsc47m192_attributes,
 429 };
 430
 431 static struct attribute *smsc47m192_attributes_in4[] = {
 432         &sensor_dev_attr_in4_input.dev_attr.attr,
 433         &sensor_dev_attr_in4_min.dev_attr.attr,
 434         &sensor_dev_attr_in4_max.dev_attr.attr,
 435         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 436         NULL
 437 };
 438
 439 static const struct attribute_group smsc47m192_group_in4 = {
 440         .attrs = smsc47m192_attributes_in4,
 441 };
 442
 443 /* This function is called when:
 444     * smsc47m192_driver is inserted (when this module is loaded), for each
 445       available adapter
 446     * when a new adapter is inserted (and smsc47m192_driver is still present) */
 447 static int smsc47m192_attach_adapter(struct i2c_adapter *adapter)
 448 {
 449         if (!(adapter->class & I2C_CLASS_HWMON))
 450                 return 0;
 451         return i2c_probe(adapter, &addr_data, smsc47m192_detect);
 452 }
 453
 454 static void smsc47m192_init_client(struct i2c_client *client)
 455 {
 456         int i;
 457         u8 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
 458         u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
 459
 460         /* select cycle mode (pause 1 sec between updates) */
 461         i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
 462                                                 (sfr & 0xfd) | 0x02);
 463         if (!(config & 0x01)) {
 464                 /* initialize alarm limits */
 465                 for (i=0; i<8; i++) {
 466                         i2c_smbus_write_byte_data(client,
 467                                 SMSC47M192_REG_IN_MIN(i), 0);
 468                         i2c_smbus_write_byte_data(client,
 469                                 SMSC47M192_REG_IN_MAX(i), 0xff);
 470                 }
 471                 for (i=0; i<3; i++) {
 472                         i2c_smbus_write_byte_data(client,
 473                                 SMSC47M192_REG_TEMP_MIN[i], 0x80);
 474                         i2c_smbus_write_byte_data(client,
 475                                 SMSC47M192_REG_TEMP_MAX[i], 0x7f);
 476                 }
 477
 478                 /* start monitoring */
 479                 i2c_smbus_write_byte_data(client, SMSC47M192_REG_CONFIG,
 480                                                 (config & 0xf7) | 0x01);
 481         }
 482 }
 483
 484 /* This function is called by i2c_probe */
 485 static int smsc47m192_detect(struct i2c_adapter *adapter, int address,
 486                 int kind)
 487 {
 488         struct i2c_client *client;
 489         struct smsc47m192_data *data;
 490         int err = 0;
 491         int version, config;
 492
 493         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 494                 goto exit;
 495
 496         if (!(data = kzalloc(sizeof(struct smsc47m192_data), GFP_KERNEL))) {
 497                 err = -ENOMEM;
 498                 goto exit;
 499         }
 500
 501         client = &data->client;
 502         i2c_set_clientdata(client, data);
 503         client->addr = address;
 504         client->adapter = adapter;
 505         client->driver = &smsc47m192_driver;
 506
 507         if (kind == 0)
 508                 kind = smsc47m192;
 509
 510         /* Detection criteria from sensors_detect script */
 511         if (kind < 0) {
 512                 if (i2c_smbus_read_byte_data(client,
 513                                 SMSC47M192_REG_COMPANY_ID) == 0x55
 514                  && ((version = i2c_smbus_read_byte_data(client,
 515                                 SMSC47M192_REG_VERSION)) & 0xf0) == 0x20
 516                  && (i2c_smbus_read_byte_data(client,
 517                                 SMSC47M192_REG_VID) & 0x70) == 0x00
 518                  && (i2c_smbus_read_byte_data(client,
 519                                 SMSC47M192_REG_VID4) & 0xfe) == 0x80) {
 520                         dev_info(&adapter->dev,
 521                                  "found SMSC47M192 or compatible, "
 522                                  "version 2, stepping A%d\n", version & 0x0f);
 523                 } else {
 524                         dev_dbg(&adapter->dev,
 525                                 "SMSC47M192 detection failed at 0x%02x\n",
 526                                 address);
 527                         goto exit_free;
 528                 }
 529         }
 530
 531         /* Fill in the remaining client fields and put into the global list */
 532         strlcpy(client->name, "smsc47m192", I2C_NAME_SIZE);
 533         data->vrm = vid_which_vrm();
 534         mutex_init(&data->update_lock);
 535
 536         /* Tell the I2C layer a new client has arrived */
 537         if ((err = i2c_attach_client(client)))
 538                 goto exit_free;
 539
 540         /* Initialize the SMSC47M192 chip */
 541         smsc47m192_init_client(client);
 542
 543         /* Register sysfs hooks */
 544         if ((err = sysfs_create_group(&client->dev.kobj, &smsc47m192_group)))
 545                 goto exit_detach;
 546
 547         /* Pin 110 is either in4 (+12V) or VID4 */
 548         config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
 549         if (!(config & 0x20)) {
 550                 if ((err = sysfs_create_group(&client->dev.kobj,
 551                                               &smsc47m192_group_in4)))
 552                         goto exit_remove_files;
 553         }
 554
 555         data->hwmon_dev = hwmon_device_register(&client->dev);
 556         if (IS_ERR(data->hwmon_dev)) {
 557                 err = PTR_ERR(data->hwmon_dev);
 558                 goto exit_remove_files;
 559         }
 560
 561         return 0;
 562
 563 exit_remove_files:
 564         sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);
 565         sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);
 566 exit_detach:
 567         i2c_detach_client(client);
 568 exit_free:
 569         kfree(data);
 570 exit:
 571         return err;
 572 }
 573
 574 static int smsc47m192_detach_client(struct i2c_client *client)
 575 {
 576         struct smsc47m192_data *data = i2c_get_clientdata(client);
 577         int err;
 578
 579         hwmon_device_unregister(data->hwmon_dev);
 580         sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);
 581         sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);
 582
 583         if ((err = i2c_detach_client(client)))
 584                 return err;
 585
 586         kfree(data);
 587
 588         return 0;
 589 }
 590
 591 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev)
 592 {
 593         struct i2c_client *client = to_i2c_client(dev);
 594         struct smsc47m192_data *data = i2c_get_clientdata(client);
 595         int i, config;
 596
 597         mutex_lock(&data->update_lock);
 598
 599         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 600          || !data->valid) {
 601                 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
 602
 603                 dev_dbg(&client->dev, "Starting smsc47m192 update\n");
 604
 605                 for (i = 0; i <= 7; i++) {
 606                         data->in[i] = i2c_smbus_read_byte_data(client,
 607                                                 SMSC47M192_REG_IN(i));
 608                         data->in_min[i] = i2c_smbus_read_byte_data(client,
 609                                                 SMSC47M192_REG_IN_MIN(i));
 610                         data->in_max[i] = i2c_smbus_read_byte_data(client,
 611                                                 SMSC47M192_REG_IN_MAX(i));
 612                 }
 613                 for (i = 0; i < 3; i++) {
 614                         data->temp[i] = i2c_smbus_read_byte_data(client,
 615                                                 SMSC47M192_REG_TEMP[i]);
 616                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
 617                                                 SMSC47M192_REG_TEMP_MAX[i]);
 618                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
 619                                                 SMSC47M192_REG_TEMP_MIN[i]);
 620                 }
 621                 for (i = 1; i < 3; i++)
 622                         data->temp_offset[i] = i2c_smbus_read_byte_data(client,
 623                                                 SMSC47M192_REG_TEMP_OFFSET(i));
 624                 /* first offset is temp_offset[0] if SFR bit 4 is set,
 625                                         temp_offset[1] otherwise */
 626                 if (sfr & 0x10) {
 627                         data->temp_offset[0] = data->temp_offset[1];
 628                         data->temp_offset[1] = 0;
 629                 } else
 630                         data->temp_offset[0] = 0;
 631
 632                 data->vid = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VID)
 633                             & 0x0f;
 634                 config = i2c_smbus_read_byte_data(client,
 635                                                   SMSC47M192_REG_CONFIG);
 636                 if (config & 0x20)
 637                         data->vid |= (i2c_smbus_read_byte_data(client,
 638                                         SMSC47M192_REG_VID4) & 0x01) << 4;
 639                 data->alarms = i2c_smbus_read_byte_data(client,
 640                                                 SMSC47M192_REG_ALARM1) |
 641                                (i2c_smbus_read_byte_data(client,
 642                                                 SMSC47M192_REG_ALARM2) << 8);
 643
 644                 data->last_updated = jiffies;
 645                 data->valid = 1;
 646         }
 647
 648         mutex_unlock(&data->update_lock);
 649
 650         return data;
 651 }
 652
 653 static int __init smsc47m192_init(void)
 654 {
 655         return i2c_add_driver(&smsc47m192_driver);
 656 }
 657
 658 static void __exit smsc47m192_exit(void)
 659 {
 660         i2c_del_driver(&smsc47m192_driver);
 661 }
 662
 663 MODULE_AUTHOR("Hartmut Rick <linux@rick.claranet.de>");
 664 MODULE_DESCRIPTION("SMSC47M192 driver");
 665 MODULE_LICENSE("GPL");
 666
 667 module_init(smsc47m192_init);
 668 module_exit(smsc47m192_exit);