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   1 /*
   2     smsc47m192.c - Support for hardware monitoring block of
   3                    SMSC LPC47M192 and LPC47M997 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
  35 /* Addresses to scan */
  36 static unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
  37
  38 /* Insmod parameters */
  39 I2C_CLIENT_INSMOD_1(smsc47m192);
  40
  41 /* SMSC47M192 registers */
  42 #define SMSC47M192_REG_IN(nr)           ((nr)<6 ? (0x20 + (nr)) : \
  43                                         (0x50 + (nr) - 6))
  44 #define SMSC47M192_REG_IN_MAX(nr)       ((nr)<6 ? (0x2b + (nr) * 2) : \
  45                                         (0x54 + (((nr) - 6) * 2)))
  46 #define SMSC47M192_REG_IN_MIN(nr)       ((nr)<6 ? (0x2c + (nr) * 2) : \
  47                                         (0x55 + (((nr) - 6) * 2)))
  48 static u8 SMSC47M192_REG_TEMP[3] =      { 0x27, 0x26, 0x52 };
  49 static u8 SMSC47M192_REG_TEMP_MAX[3] =  { 0x39, 0x37, 0x58 };
  50 static u8 SMSC47M192_REG_TEMP_MIN[3] =  { 0x3A, 0x38, 0x59 };
  51 #define SMSC47M192_REG_TEMP_OFFSET(nr)  ((nr)==2 ? 0x1e : 0x1f)
  52 #define SMSC47M192_REG_ALARM1           0x41
  53 #define SMSC47M192_REG_ALARM2           0x42
  54 #define SMSC47M192_REG_VID              0x47
  55 #define SMSC47M192_REG_VID4             0x49
  56 #define SMSC47M192_REG_CONFIG           0x40
  57 #define SMSC47M192_REG_SFR              0x4f
  58 #define SMSC47M192_REG_COMPANY_ID       0x3e
  59 #define SMSC47M192_REG_VERSION          0x3f
  60
  61 /* generalised scaling with integer rounding */
  62 static inline int SCALE(long val, int mul, int div)
  63 {
  64         if (val < 0)
  65                 return (val * mul - div / 2) / div;
  66         else
  67                 return (val * mul + div / 2) / div;
  68 }
  69
  70 /* Conversions */
  71
  72 /* smsc47m192 internally scales voltage measurements */
  73 static const u16 nom_mv[] = { 2500, 2250, 3300, 5000, 12000, 3300, 1500, 1800 };
  74
  75 static inline unsigned int IN_FROM_REG(u8 reg, int n)
  76 {
  77         return SCALE(reg, nom_mv[n], 192);
  78 }
  79
  80 static inline u8 IN_TO_REG(unsigned long val, int n)
  81 {
  82         return SENSORS_LIMIT(SCALE(val, 192, nom_mv[n]), 0, 255);
  83 }
  84
  85 /* TEMP: 0.001 degC units (-128C to +127C)
  86    REG: 1C/bit, two's complement */
  87 static inline s8 TEMP_TO_REG(int val)
  88 {
  89         return SENSORS_LIMIT(SCALE(val, 1, 1000), -128000, 127000);
  90 }
  91
  92 static inline int TEMP_FROM_REG(s8 val)
  93 {
  94         return val * 1000;
  95 }
  96
  97 struct smsc47m192_data {
  98         struct i2c_client client;
  99         struct class_device *class_dev;
 100         struct semaphore 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_attach_adapter(struct i2c_adapter *adapter);
 117 static int smsc47m192_detect(struct i2c_adapter *adapter, int address,
 118                 int kind);
 119 static int smsc47m192_detach_client(struct i2c_client *client);
 120 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev);
 121
 122 static struct i2c_driver smsc47m192_driver = {
 123         .driver = {
 124                 .name   = "smsc47m192",
 125         },
 126         .attach_adapter = smsc47m192_attach_adapter,
 127         .detach_client  = smsc47m192_detach_client,
 128 };
 129
 130 /* Voltages */
 131 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
 132                 char *buf)
 133 {
 134         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 135         int nr = sensor_attr->index;
 136         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 137         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
 138 }
 139
 140 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
 141                 char *buf)
 142 {
 143         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 144         int nr = sensor_attr->index;
 145         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 146         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
 147 }
 148
 149 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
 150                 char *buf)
 151 {
 152         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 153         int nr = sensor_attr->index;
 154         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 155         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));
 156 }
 157
 158 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 159                 const char *buf, size_t count)
 160 {
 161         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 162         int nr = sensor_attr->index;
 163         struct i2c_client *client = to_i2c_client(dev);
 164         struct smsc47m192_data *data = i2c_get_clientdata(client);
 165         unsigned long val = simple_strtoul(buf, NULL, 10);
 166
 167         down(&data->update_lock);
 168         data->in_min[nr] = IN_TO_REG(val, nr);
 169         i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MIN(nr),
 170                                                         data->in_min[nr]);
 171         up(&data->update_lock);
 172         return count;
 173 }
 174
 175 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 176                 const char *buf, size_t count)
 177 {
 178         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 179         int nr = sensor_attr->index;
 180         struct i2c_client *client = to_i2c_client(dev);
 181         struct smsc47m192_data *data = i2c_get_clientdata(client);
 182         unsigned long val = simple_strtoul(buf, NULL, 10);
 183
 184         down(&data->update_lock);
 185         data->in_max[nr] = IN_TO_REG(val, nr);
 186         i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MAX(nr),
 187                                                         data->in_max[nr]);
 188         up(&data->update_lock);
 189         return count;
 190 }
 191
 192 #define show_in_offset(offset)                                  \
 193 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
 194                 show_in, NULL, offset);                         \
 195 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
 196                 show_in_min, set_in_min, offset);               \
 197 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
 198                 show_in_max, set_in_max, offset);
 199
 200 show_in_offset(0)
 201 show_in_offset(1)
 202 show_in_offset(2)
 203 show_in_offset(3)
 204 show_in_offset(4)
 205 show_in_offset(5)
 206 show_in_offset(6)
 207 show_in_offset(7)
 208
 209 /* Temperatures */
 210 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 211                 char *buf)
 212 {
 213         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 214         int nr = sensor_attr->index;
 215         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 216         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
 217 }
 218
 219 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
 220                 char *buf)
 221 {
 222         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 223         int nr = sensor_attr->index;
 224         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 225         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr]));
 226 }
 227
 228 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
 229                 char *buf)
 230 {
 231         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 232         int nr = sensor_attr->index;
 233         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 234         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[nr]));
 235 }
 236
 237 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 238                 const char *buf, size_t count)
 239 {
 240         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 241         int nr = sensor_attr->index;
 242         struct i2c_client *client = to_i2c_client(dev);
 243         struct smsc47m192_data *data = i2c_get_clientdata(client);
 244         long val = simple_strtol(buf, NULL, 10);
 245
 246         down(&data->update_lock);
 247         data->temp_min[nr] = TEMP_TO_REG(val);
 248         i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr],
 249                                                 data->temp_min[nr]);
 250         up(&data->update_lock);
 251         return count;
 252 }
 253
 254 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 255                 const char *buf, size_t count)
 256 {
 257         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 258         int nr = sensor_attr->index;
 259         struct i2c_client *client = to_i2c_client(dev);
 260         struct smsc47m192_data *data = i2c_get_clientdata(client);
 261         long val = simple_strtol(buf, NULL, 10);
 262
 263         down(&data->update_lock);
 264         data->temp_max[nr] = TEMP_TO_REG(val);
 265         i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr],
 266                                                 data->temp_max[nr]);
 267         up(&data->update_lock);
 268         return count;
 269 }
 270
 271 static ssize_t show_temp_offset(struct device *dev, struct device_attribute
 272                 *attr, char *buf)
 273 {
 274         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 275         int nr = sensor_attr->index;
 276         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 277         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr]));
 278 }
 279
 280 static ssize_t set_temp_offset(struct device *dev, struct device_attribute
 281                 *attr, const char *buf, size_t count)
 282 {
 283         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 284         int nr = sensor_attr->index;
 285         struct i2c_client *client = to_i2c_client(dev);
 286         struct smsc47m192_data *data = i2c_get_clientdata(client);
 287         u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
 288         long val = simple_strtol(buf, NULL, 10);
 289
 290         down(&data->update_lock);
 291         data->temp_offset[nr] = TEMP_TO_REG(val);
 292         if (nr>1)
 293                 i2c_smbus_write_byte_data(client,
 294                         SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
 295         else if (data->temp_offset[nr] != 0) {
 296                 /* offset[0] and offset[1] share the same register,
 297                         SFR bit 4 activates offset[0] */
 298                 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
 299                                         (sfr & 0xef) | (nr==0 ? 0x10 : 0));
 300                 data->temp_offset[1-nr] = 0;
 301                 i2c_smbus_write_byte_data(client,
 302                         SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
 303         } else if ((sfr & 0x10) == (nr==0 ? 0x10 : 0))
 304                 i2c_smbus_write_byte_data(client,
 305                                         SMSC47M192_REG_TEMP_OFFSET(nr), 0);
 306         up(&data->update_lock);
 307         return count;
 308 }
 309
 310 #define show_temp_index(index)                                          \
 311 static SENSOR_DEVICE_ATTR(temp##index##_input, S_IRUGO,                 \
 312                 show_temp, NULL, index-1);                              \
 313 static SENSOR_DEVICE_ATTR(temp##index##_min, S_IRUGO | S_IWUSR,         \
 314                 show_temp_min, set_temp_min, index-1);                  \
 315 static SENSOR_DEVICE_ATTR(temp##index##_max, S_IRUGO | S_IWUSR,         \
 316                 show_temp_max, set_temp_max, index-1);                  \
 317 static SENSOR_DEVICE_ATTR(temp##index##_offset, S_IRUGO | S_IWUSR,      \
 318                 show_temp_offset, set_temp_offset, index-1);
 319
 320 show_temp_index(1)
 321 show_temp_index(2)
 322 show_temp_index(3)
 323
 324 /* VID */
 325 static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
 326                 char *buf)
 327 {
 328         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 329         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 330 }
 331 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 332
 333 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
 334                 char *buf)
 335 {
 336         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 337         return sprintf(buf, "%d\n", data->vrm);
 338 }
 339
 340 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
 341                 const char *buf, size_t count)
 342 {
 343         struct i2c_client *client = to_i2c_client(dev);
 344         struct smsc47m192_data *data = i2c_get_clientdata(client);
 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_input_fault, S_IRUGO, show_alarm, NULL, 0x4000);
 364 static SENSOR_DEVICE_ATTR(temp3_input_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_input_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_input_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 SMSC47M997, "
 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         init_MUTEX(&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->class_dev = hwmon_device_register(&client->dev);
 556         if (IS_ERR(data->class_dev)) {
 557                 err = PTR_ERR(data->class_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->class_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         down(&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         up(&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);