drivers/hwmon/emc6w201.c

   1 /*
   2  * emc6w201.c - Hardware monitoring driver for the SMSC EMC6W201
   3  * Copyright (C) 2011  Jean Delvare <khali@linux-fr.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/delay.h>
  22 #include <linux/init.h>
  23 #include <linux/slab.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/i2c.h>
  26 #include <linux/hwmon.h>
  27 #include <linux/hwmon-sysfs.h>
  28 #include <linux/err.h>
  29 #include <linux/mutex.h>
  30
  31 /*
  32  * Addresses to scan
  33  */
  34
  35 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  36
  37 /*
  38  * The EMC6W201 registers
  39  */
  40
  41 #define EMC6W201_REG_IN(nr)             (0x20 + (nr))
  42 #define EMC6W201_REG_TEMP(nr)           (0x26 + (nr))
  43 #define EMC6W201_REG_FAN(nr)            (0x2C + (nr) * 2)
  44 #define EMC6W201_REG_COMPANY            0x3E
  45 #define EMC6W201_REG_VERSTEP            0x3F
  46 #define EMC6W201_REG_CONFIG             0x40
  47 #define EMC6W201_REG_IN_LOW(nr)         (0x4A + (nr) * 2)
  48 #define EMC6W201_REG_IN_HIGH(nr)        (0x4B + (nr) * 2)
  49 #define EMC6W201_REG_TEMP_LOW(nr)       (0x56 + (nr) * 2)
  50 #define EMC6W201_REG_TEMP_HIGH(nr)      (0x57 + (nr) * 2)
  51 #define EMC6W201_REG_FAN_MIN(nr)        (0x62 + (nr) * 2)
  52
  53 enum { input, min, max } subfeature;
  54
  55 /*
  56  * Per-device data
  57  */
  58
  59 struct emc6w201_data {
  60         struct device *hwmon_dev;
  61         struct mutex update_lock;
  62         char valid; /* zero until following fields are valid */
  63         unsigned long last_updated; /* in jiffies */
  64
  65         /* registers values */
  66         u8 in[3][6];
  67         s8 temp[3][6];
  68         u16 fan[2][5];
  69 };
  70
  71 /*
  72  * Combine LSB and MSB registers in a single value
  73  * Locking: must be called with data->update_lock held
  74  */
  75 static u16 emc6w201_read16(struct i2c_client *client, u8 reg)
  76 {
  77         int lsb, msb;
  78
  79         lsb = i2c_smbus_read_byte_data(client, reg);
  80         msb = i2c_smbus_read_byte_data(client, reg + 1);
  81         if (lsb < 0 || msb < 0) {
  82                 dev_err(&client->dev, "16-bit read failed at 0x%02x\n", reg);
  83                 return 0xFFFF;  /* Arbitrary value */
  84         }
  85
  86         return (msb << 8) | lsb;
  87 }
  88
  89 /*
  90  * Write 16-bit value to LSB and MSB registers
  91  * Locking: must be called with data->update_lock held
  92  */
  93 static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val)
  94 {
  95         int err;
  96
  97         err = i2c_smbus_write_byte_data(client, reg, val & 0xff);
  98         if (!err)
  99                 err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8);
 100         if (err < 0)
 101                 dev_err(&client->dev, "16-bit write failed at 0x%02x\n", reg);
 102
 103         return err;
 104 }
 105
 106 static struct emc6w201_data *emc6w201_update_device(struct device *dev)
 107 {
 108         struct i2c_client *client = to_i2c_client(dev);
 109         struct emc6w201_data *data = i2c_get_clientdata(client);
 110         int nr;
 111
 112         mutex_lock(&data->update_lock);
 113
 114         if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 115                 for (nr = 0; nr < 6; nr++) {
 116                         data->in[input][nr] =
 117                                 i2c_smbus_read_byte_data(client,
 118                                                 EMC6W201_REG_IN(nr));
 119                         data->in[min][nr] =
 120                                 i2c_smbus_read_byte_data(client,
 121                                                 EMC6W201_REG_IN_LOW(nr));
 122                         data->in[max][nr] =
 123                                 i2c_smbus_read_byte_data(client,
 124                                                 EMC6W201_REG_IN_HIGH(nr));
 125                 }
 126
 127                 for (nr = 0; nr < 6; nr++) {
 128                         data->temp[input][nr] =
 129                                 i2c_smbus_read_byte_data(client,
 130                                                 EMC6W201_REG_TEMP(nr));
 131                         data->temp[min][nr] =
 132                                 i2c_smbus_read_byte_data(client,
 133                                                 EMC6W201_REG_TEMP_LOW(nr));
 134                         data->temp[max][nr] =
 135                                 i2c_smbus_read_byte_data(client,
 136                                                 EMC6W201_REG_TEMP_HIGH(nr));
 137                 }
 138
 139                 for (nr = 0; nr < 5; nr++) {
 140                         data->fan[input][nr] =
 141                                 emc6w201_read16(client,
 142                                                 EMC6W201_REG_FAN(nr));
 143                         data->fan[min][nr] =
 144                                 emc6w201_read16(client,
 145                                                 EMC6W201_REG_FAN_MIN(nr));
 146                 }
 147
 148                 data->last_updated = jiffies;
 149                 data->valid = 1;
 150         }
 151
 152         mutex_unlock(&data->update_lock);
 153
 154         return data;
 155 }
 156
 157 /*
 158  * Sysfs callback functions
 159  */
 160
 161 static const u16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 };
 162
 163 static ssize_t show_in(struct device *dev, struct device_attribute *devattr,
 164         char *buf)
 165 {
 166         struct emc6w201_data *data = emc6w201_update_device(dev);
 167         int sf = to_sensor_dev_attr_2(devattr)->index;
 168         int nr = to_sensor_dev_attr_2(devattr)->nr;
 169
 170         return sprintf(buf, "%u\n",
 171                        (unsigned)data->in[sf][nr] * nominal_mv[nr] / 0xC0);
 172 }
 173
 174 static ssize_t set_in(struct device *dev, struct device_attribute *devattr,
 175                       const char *buf, size_t count)
 176 {
 177         struct i2c_client *client = to_i2c_client(dev);
 178         struct emc6w201_data *data = i2c_get_clientdata(client);
 179         int sf = to_sensor_dev_attr_2(devattr)->index;
 180         int nr = to_sensor_dev_attr_2(devattr)->nr;
 181         int err;
 182         long val;
 183         u8 reg;
 184
 185         err = strict_strtol(buf, 10, &val);
 186         if (err < 0)
 187                 return err;
 188
 189         val = DIV_ROUND_CLOSEST(val * 0xC0, nominal_mv[nr]);
 190         reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr)
 191                           : EMC6W201_REG_IN_HIGH(nr);
 192
 193         mutex_lock(&data->update_lock);
 194         data->in[sf][nr] = SENSORS_LIMIT(val, 0, 255);
 195         err = i2c_smbus_write_byte_data(client, reg, data->in[sf][nr]);
 196         mutex_unlock(&data->update_lock);
 197
 198         return err < 0 ? err : count;
 199 }
 200
 201 static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
 202         char *buf)
 203 {
 204         struct emc6w201_data *data = emc6w201_update_device(dev);
 205         int sf = to_sensor_dev_attr_2(devattr)->index;
 206         int nr = to_sensor_dev_attr_2(devattr)->nr;
 207
 208         return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000);
 209 }
 210
 211 static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
 212                         const char *buf, size_t count)
 213 {
 214         struct i2c_client *client = to_i2c_client(dev);
 215         struct emc6w201_data *data = i2c_get_clientdata(client);
 216         int sf = to_sensor_dev_attr_2(devattr)->index;
 217         int nr = to_sensor_dev_attr_2(devattr)->nr;
 218         int err;
 219         long val;
 220         u8 reg;
 221
 222         err = strict_strtol(buf, 10, &val);
 223         if (err < 0)
 224                 return err;
 225
 226         val /= 1000;
 227         reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr)
 228                           : EMC6W201_REG_TEMP_HIGH(nr);
 229
 230         mutex_lock(&data->update_lock);
 231         data->temp[sf][nr] = SENSORS_LIMIT(val, -127, 128);
 232         err = i2c_smbus_write_byte_data(client, reg, data->temp[sf][nr]);
 233         mutex_unlock(&data->update_lock);
 234
 235         return err < 0 ? err : count;
 236 }
 237
 238 static ssize_t show_fan(struct device *dev, struct device_attribute *devattr,
 239         char *buf)
 240 {
 241         struct emc6w201_data *data = emc6w201_update_device(dev);
 242         int sf = to_sensor_dev_attr_2(devattr)->index;
 243         int nr = to_sensor_dev_attr_2(devattr)->nr;
 244         unsigned rpm;
 245
 246         if (data->fan[sf][nr] == 0 || data->fan[sf][nr] == 0xFFFF)
 247                 rpm = 0;
 248         else
 249                 rpm = 5400000U / data->fan[sf][nr];
 250
 251         return sprintf(buf, "%u\n", rpm);
 252 }
 253
 254 static ssize_t set_fan(struct device *dev, struct device_attribute *devattr,
 255                        const char *buf, size_t count)
 256 {
 257         struct i2c_client *client = to_i2c_client(dev);
 258         struct emc6w201_data *data = i2c_get_clientdata(client);
 259         int sf = to_sensor_dev_attr_2(devattr)->index;
 260         int nr = to_sensor_dev_attr_2(devattr)->nr;
 261         int err;
 262         unsigned long val;
 263
 264         err = strict_strtoul(buf, 10, &val);
 265         if (err < 0)
 266                 return err;
 267
 268         if (val == 0) {
 269                 val = 0xFFFF;
 270         } else {
 271                 val = DIV_ROUND_CLOSEST(5400000U, val);
 272                 val = SENSORS_LIMIT(val, 0, 0xFFFE);
 273         }
 274
 275         mutex_lock(&data->update_lock);
 276         data->fan[sf][nr] = val;
 277         err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr),
 278                                data->fan[sf][nr]);
 279         mutex_unlock(&data->update_lock);
 280
 281         return err < 0 ? err : count;
 282 }
 283
 284 static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in, NULL, 0, input);
 285 static SENSOR_DEVICE_ATTR_2(in0_min, S_IRUGO | S_IWUSR, show_in, set_in,
 286                             0, min);
 287 static SENSOR_DEVICE_ATTR_2(in0_max, S_IRUGO | S_IWUSR, show_in, set_in,
 288                             0, max);
 289 static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in, NULL, 1, input);
 290 static SENSOR_DEVICE_ATTR_2(in1_min, S_IRUGO | S_IWUSR, show_in, set_in,
 291                             1, min);
 292 static SENSOR_DEVICE_ATTR_2(in1_max, S_IRUGO | S_IWUSR, show_in, set_in,
 293                             1, max);
 294 static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in, NULL, 2, input);
 295 static SENSOR_DEVICE_ATTR_2(in2_min, S_IRUGO | S_IWUSR, show_in, set_in,
 296                             2, min);
 297 static SENSOR_DEVICE_ATTR_2(in2_max, S_IRUGO | S_IWUSR, show_in, set_in,
 298                             2, max);
 299 static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_in, NULL, 3, input);
 300 static SENSOR_DEVICE_ATTR_2(in3_min, S_IRUGO | S_IWUSR, show_in, set_in,
 301                             3, min);
 302 static SENSOR_DEVICE_ATTR_2(in3_max, S_IRUGO | S_IWUSR, show_in, set_in,
 303                             3, max);
 304 static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_in, NULL, 4, input);
 305 static SENSOR_DEVICE_ATTR_2(in4_min, S_IRUGO | S_IWUSR, show_in, set_in,
 306                             4, min);
 307 static SENSOR_DEVICE_ATTR_2(in4_max, S_IRUGO | S_IWUSR, show_in, set_in,
 308                             4, max);
 309 static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO, show_in, NULL, 5, input);
 310 static SENSOR_DEVICE_ATTR_2(in5_min, S_IRUGO | S_IWUSR, show_in, set_in,
 311                             5, min);
 312 static SENSOR_DEVICE_ATTR_2(in5_max, S_IRUGO | S_IWUSR, show_in, set_in,
 313                             5, max);
 314
 315 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, input);
 316 static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
 317                             0, min);
 318 static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 319                             0, max);
 320 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, input);
 321 static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
 322                             1, min);
 323 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 324                             1, max);
 325 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 2, input);
 326 static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
 327                             2, min);
 328 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 329                             2, max);
 330 static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 3, input);
 331 static SENSOR_DEVICE_ATTR_2(temp4_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
 332                             3, min);
 333 static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 334                             3, max);
 335 static SENSOR_DEVICE_ATTR_2(temp5_input, S_IRUGO, show_temp, NULL, 4, input);
 336 static SENSOR_DEVICE_ATTR_2(temp5_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
 337                             4, min);
 338 static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 339                             4, max);
 340 static SENSOR_DEVICE_ATTR_2(temp6_input, S_IRUGO, show_temp, NULL, 5, input);
 341 static SENSOR_DEVICE_ATTR_2(temp6_min, S_IRUGO | S_IWUSR, show_temp, set_temp,
 342                             5, min);
 343 static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 344                             5, max);
 345
 346 static SENSOR_DEVICE_ATTR_2(fan1_input, S_IRUGO, show_fan, NULL, 0, input);
 347 static SENSOR_DEVICE_ATTR_2(fan1_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
 348                             0, min);
 349 static SENSOR_DEVICE_ATTR_2(fan2_input, S_IRUGO, show_fan, NULL, 1, input);
 350 static SENSOR_DEVICE_ATTR_2(fan2_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
 351                             1, min);
 352 static SENSOR_DEVICE_ATTR_2(fan3_input, S_IRUGO, show_fan, NULL, 2, input);
 353 static SENSOR_DEVICE_ATTR_2(fan3_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
 354                             2, min);
 355 static SENSOR_DEVICE_ATTR_2(fan4_input, S_IRUGO, show_fan, NULL, 3, input);
 356 static SENSOR_DEVICE_ATTR_2(fan4_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
 357                             3, min);
 358 static SENSOR_DEVICE_ATTR_2(fan5_input, S_IRUGO, show_fan, NULL, 4, input);
 359 static SENSOR_DEVICE_ATTR_2(fan5_min, S_IRUGO | S_IWUSR, show_fan, set_fan,
 360                             4, min);
 361
 362 static struct attribute *emc6w201_attributes[] = {
 363         &sensor_dev_attr_in0_input.dev_attr.attr,
 364         &sensor_dev_attr_in0_min.dev_attr.attr,
 365         &sensor_dev_attr_in0_max.dev_attr.attr,
 366         &sensor_dev_attr_in1_input.dev_attr.attr,
 367         &sensor_dev_attr_in1_min.dev_attr.attr,
 368         &sensor_dev_attr_in1_max.dev_attr.attr,
 369         &sensor_dev_attr_in2_input.dev_attr.attr,
 370         &sensor_dev_attr_in2_min.dev_attr.attr,
 371         &sensor_dev_attr_in2_max.dev_attr.attr,
 372         &sensor_dev_attr_in3_input.dev_attr.attr,
 373         &sensor_dev_attr_in3_min.dev_attr.attr,
 374         &sensor_dev_attr_in3_max.dev_attr.attr,
 375         &sensor_dev_attr_in4_input.dev_attr.attr,
 376         &sensor_dev_attr_in4_min.dev_attr.attr,
 377         &sensor_dev_attr_in4_max.dev_attr.attr,
 378         &sensor_dev_attr_in5_input.dev_attr.attr,
 379         &sensor_dev_attr_in5_min.dev_attr.attr,
 380         &sensor_dev_attr_in5_max.dev_attr.attr,
 381
 382         &sensor_dev_attr_temp1_input.dev_attr.attr,
 383         &sensor_dev_attr_temp1_min.dev_attr.attr,
 384         &sensor_dev_attr_temp1_max.dev_attr.attr,
 385         &sensor_dev_attr_temp2_input.dev_attr.attr,
 386         &sensor_dev_attr_temp2_min.dev_attr.attr,
 387         &sensor_dev_attr_temp2_max.dev_attr.attr,
 388         &sensor_dev_attr_temp3_input.dev_attr.attr,
 389         &sensor_dev_attr_temp3_min.dev_attr.attr,
 390         &sensor_dev_attr_temp3_max.dev_attr.attr,
 391         &sensor_dev_attr_temp4_input.dev_attr.attr,
 392         &sensor_dev_attr_temp4_min.dev_attr.attr,
 393         &sensor_dev_attr_temp4_max.dev_attr.attr,
 394         &sensor_dev_attr_temp5_input.dev_attr.attr,
 395         &sensor_dev_attr_temp5_min.dev_attr.attr,
 396         &sensor_dev_attr_temp5_max.dev_attr.attr,
 397         &sensor_dev_attr_temp6_input.dev_attr.attr,
 398         &sensor_dev_attr_temp6_min.dev_attr.attr,
 399         &sensor_dev_attr_temp6_max.dev_attr.attr,
 400
 401         &sensor_dev_attr_fan1_input.dev_attr.attr,
 402         &sensor_dev_attr_fan1_min.dev_attr.attr,
 403         &sensor_dev_attr_fan2_input.dev_attr.attr,
 404         &sensor_dev_attr_fan2_min.dev_attr.attr,
 405         &sensor_dev_attr_fan3_input.dev_attr.attr,
 406         &sensor_dev_attr_fan3_min.dev_attr.attr,
 407         &sensor_dev_attr_fan4_input.dev_attr.attr,
 408         &sensor_dev_attr_fan4_min.dev_attr.attr,
 409         &sensor_dev_attr_fan5_input.dev_attr.attr,
 410         &sensor_dev_attr_fan5_min.dev_attr.attr,
 411         NULL
 412 };
 413
 414 static const struct attribute_group emc6w201_group = {
 415         .attrs = emc6w201_attributes,
 416 };
 417
 418 /*
 419  * Driver interface
 420  */
 421
 422 /* Return 0 if detection is successful, -ENODEV otherwise */
 423 static int emc6w201_detect(struct i2c_client *client,
 424                            struct i2c_board_info *info)
 425 {
 426         struct i2c_adapter *adapter = client->adapter;
 427         int company, verstep, config;
 428
 429         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 430                 return -ENODEV;
 431
 432         /* Identification */
 433         company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY);
 434         if (company != 0x5C)
 435                 return -ENODEV;
 436         verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP);
 437         if (verstep < 0 || (verstep & 0xF0) != 0xB0)
 438                 return -ENODEV;
 439         if ((verstep & 0x0F) > 2) {
 440                 dev_dbg(&client->dev, "Unknwown EMC6W201 stepping %d\n",
 441                         verstep & 0x0F);
 442                 return -ENODEV;
 443         }
 444
 445         /* Check configuration */
 446         config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG);
 447         if ((config & 0xF4) != 0x04)
 448                 return -ENODEV;
 449         if (!(config & 0x01)) {
 450                 dev_err(&client->dev, "Monitoring not enabled\n");
 451                 return -ENODEV;
 452         }
 453
 454         strlcpy(info->type, "emc6w201", I2C_NAME_SIZE);
 455
 456         return 0;
 457 }
 458
 459 static int emc6w201_probe(struct i2c_client *client,
 460                           const struct i2c_device_id *id)
 461 {
 462         struct emc6w201_data *data;
 463         int err;
 464
 465         data = kzalloc(sizeof(struct emc6w201_data), GFP_KERNEL);
 466         if (!data) {
 467                 err = -ENOMEM;
 468                 goto exit;
 469         }
 470
 471         i2c_set_clientdata(client, data);
 472         mutex_init(&data->update_lock);
 473
 474         /* Create sysfs attribute */
 475         err = sysfs_create_group(&client->dev.kobj, &emc6w201_group);
 476         if (err)
 477                 goto exit_free;
 478
 479         /* Expose as a hwmon device */
 480         data->hwmon_dev = hwmon_device_register(&client->dev);
 481         if (IS_ERR(data->hwmon_dev)) {
 482                 err = PTR_ERR(data->hwmon_dev);
 483                 goto exit_remove;
 484         }
 485
 486         return 0;
 487
 488  exit_remove:
 489         sysfs_remove_group(&client->dev.kobj, &emc6w201_group);
 490  exit_free:
 491         kfree(data);
 492  exit:
 493         return err;
 494 }
 495
 496 static int emc6w201_remove(struct i2c_client *client)
 497 {
 498         struct emc6w201_data *data = i2c_get_clientdata(client);
 499
 500         hwmon_device_unregister(data->hwmon_dev);
 501         sysfs_remove_group(&client->dev.kobj, &emc6w201_group);
 502         kfree(data);
 503
 504         return 0;
 505 }
 506
 507 static const struct i2c_device_id emc6w201_id[] = {
 508         { "emc6w201", 0 },
 509         { }
 510 };
 511 MODULE_DEVICE_TABLE(i2c, emc6w201_id);
 512
 513 static struct i2c_driver emc6w201_driver = {
 514         .class          = I2C_CLASS_HWMON,
 515         .driver = {
 516                 .name   = "emc6w201",
 517         },
 518         .probe          = emc6w201_probe,
 519         .remove         = emc6w201_remove,
 520         .id_table       = emc6w201_id,
 521         .detect         = emc6w201_detect,
 522         .address_list   = normal_i2c,
 523 };
 524
 525 static int __init sensors_emc6w201_init(void)
 526 {
 527         return i2c_add_driver(&emc6w201_driver);
 528 }
 529 module_init(sensors_emc6w201_init);
 530
 531 static void __exit sensors_emc6w201_exit(void)
 532 {
 533         i2c_del_driver(&emc6w201_driver);
 534 }
 535 module_exit(sensors_emc6w201_exit);
 536
 537 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
 538 MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver");
 539 MODULE_LICENSE("GPL");