drivers/hwmon/smsc47m192.c

   1 /*
   2  * smsc47m192.c - Support for hardware monitoring block of
   3  *                SMSC LPC47M192 and compatible Super I/O chips
   4  *
   5  * Copyright (C) 2006  Hartmut Rick <linux@rick.claranet.de>
   6  *
   7  * Derived from lm78.c and other chip drivers.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/slab.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/i2c.h>
  29 #include <linux/hwmon.h>
  30 #include <linux/hwmon-sysfs.h>
  31 #include <linux/hwmon-vid.h>
  32 #include <linux/err.h>
  33 #include <linux/sysfs.h>
  34 #include <linux/mutex.h>
  35
  36 /* Addresses to scan */
  37 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
  38
  39 /* SMSC47M192 registers */
  40 #define SMSC47M192_REG_IN(nr)           ((nr) < 6 ? (0x20 + (nr)) : \
  41                                         (0x50 + (nr) - 6))
  42 #define SMSC47M192_REG_IN_MAX(nr)       ((nr) < 6 ? (0x2b + (nr) * 2) : \
  43                                         (0x54 + (((nr) - 6) * 2)))
  44 #define SMSC47M192_REG_IN_MIN(nr)       ((nr) < 6 ? (0x2c + (nr) * 2) : \
  45                                         (0x55 + (((nr) - 6) * 2)))
  46 static u8 SMSC47M192_REG_TEMP[3] =      { 0x27, 0x26, 0x52 };
  47 static u8 SMSC47M192_REG_TEMP_MAX[3] =  { 0x39, 0x37, 0x58 };
  48 static u8 SMSC47M192_REG_TEMP_MIN[3] =  { 0x3A, 0x38, 0x59 };
  49 #define SMSC47M192_REG_TEMP_OFFSET(nr)  ((nr) == 2 ? 0x1e : 0x1f)
  50 #define SMSC47M192_REG_ALARM1           0x41
  51 #define SMSC47M192_REG_ALARM2           0x42
  52 #define SMSC47M192_REG_VID              0x47
  53 #define SMSC47M192_REG_VID4             0x49
  54 #define SMSC47M192_REG_CONFIG           0x40
  55 #define SMSC47M192_REG_SFR              0x4f
  56 #define SMSC47M192_REG_COMPANY_ID       0x3e
  57 #define SMSC47M192_REG_VERSION          0x3f
  58
  59 /* generalised scaling with integer rounding */
  60 static inline int SCALE(long val, int mul, int div)
  61 {
  62         if (val < 0)
  63                 return (val * mul - div / 2) / div;
  64         else
  65                 return (val * mul + div / 2) / div;
  66 }
  67
  68 /* Conversions */
  69
  70 /* smsc47m192 internally scales voltage measurements */
  71 static const u16 nom_mv[] = { 2500, 2250, 3300, 5000, 12000, 3300, 1500, 1800 };
  72
  73 static inline unsigned int IN_FROM_REG(u8 reg, int n)
  74 {
  75         return SCALE(reg, nom_mv[n], 192);
  76 }
  77
  78 static inline u8 IN_TO_REG(unsigned long val, int n)
  79 {
  80         val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
  81         return SCALE(val, 192, nom_mv[n]);
  82 }
  83
  84 /*
  85  * TEMP: 0.001 degC units (-128C to +127C)
  86  * REG: 1C/bit, two's complement
  87  */
  88 static inline s8 TEMP_TO_REG(long val)
  89 {
  90         return SCALE(clamp_val(val, -128000, 127000), 1, 1000);
  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         const struct attribute_group *groups[3];
 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 struct smsc47m192_data *smsc47m192_update_device(struct device *dev)
 118 {
 119         struct smsc47m192_data *data = dev_get_drvdata(dev);
 120         struct i2c_client *client = data->client;
 121         int i, config;
 122
 123         mutex_lock(&data->update_lock);
 124
 125         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 126          || !data->valid) {
 127                 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
 128
 129                 dev_dbg(&client->dev, "Starting smsc47m192 update\n");
 130
 131                 for (i = 0; i <= 7; i++) {
 132                         data->in[i] = i2c_smbus_read_byte_data(client,
 133                                                 SMSC47M192_REG_IN(i));
 134                         data->in_min[i] = i2c_smbus_read_byte_data(client,
 135                                                 SMSC47M192_REG_IN_MIN(i));
 136                         data->in_max[i] = i2c_smbus_read_byte_data(client,
 137                                                 SMSC47M192_REG_IN_MAX(i));
 138                 }
 139                 for (i = 0; i < 3; i++) {
 140                         data->temp[i] = i2c_smbus_read_byte_data(client,
 141                                                 SMSC47M192_REG_TEMP[i]);
 142                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
 143                                                 SMSC47M192_REG_TEMP_MAX[i]);
 144                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
 145                                                 SMSC47M192_REG_TEMP_MIN[i]);
 146                 }
 147                 for (i = 1; i < 3; i++)
 148                         data->temp_offset[i] = i2c_smbus_read_byte_data(client,
 149                                                 SMSC47M192_REG_TEMP_OFFSET(i));
 150                 /*
 151                  * first offset is temp_offset[0] if SFR bit 4 is set,
 152                  * temp_offset[1] otherwise
 153                  */
 154                 if (sfr & 0x10) {
 155                         data->temp_offset[0] = data->temp_offset[1];
 156                         data->temp_offset[1] = 0;
 157                 } else
 158                         data->temp_offset[0] = 0;
 159
 160                 data->vid = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VID)
 161                             & 0x0f;
 162                 config = i2c_smbus_read_byte_data(client,
 163                                                   SMSC47M192_REG_CONFIG);
 164                 if (config & 0x20)
 165                         data->vid |= (i2c_smbus_read_byte_data(client,
 166                                         SMSC47M192_REG_VID4) & 0x01) << 4;
 167                 data->alarms = i2c_smbus_read_byte_data(client,
 168                                                 SMSC47M192_REG_ALARM1) |
 169                                (i2c_smbus_read_byte_data(client,
 170                                                 SMSC47M192_REG_ALARM2) << 8);
 171
 172                 data->last_updated = jiffies;
 173                 data->valid = 1;
 174         }
 175
 176         mutex_unlock(&data->update_lock);
 177
 178         return data;
 179 }
 180
 181 /* Voltages */
 182 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
 183                 char *buf)
 184 {
 185         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 186         int nr = sensor_attr->index;
 187         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 188         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
 189 }
 190
 191 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
 192                 char *buf)
 193 {
 194         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 195         int nr = sensor_attr->index;
 196         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 197         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
 198 }
 199
 200 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
 201                 char *buf)
 202 {
 203         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 204         int nr = sensor_attr->index;
 205         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 206         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));
 207 }
 208
 209 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 210                 const char *buf, size_t count)
 211 {
 212         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 213         int nr = sensor_attr->index;
 214         struct smsc47m192_data *data = dev_get_drvdata(dev);
 215         struct i2c_client *client = data->client;
 216         unsigned long val;
 217         int err;
 218
 219         err = kstrtoul(buf, 10, &val);
 220         if (err)
 221                 return err;
 222
 223         mutex_lock(&data->update_lock);
 224         data->in_min[nr] = IN_TO_REG(val, nr);
 225         i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MIN(nr),
 226                                                         data->in_min[nr]);
 227         mutex_unlock(&data->update_lock);
 228         return count;
 229 }
 230
 231 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 232                 const char *buf, size_t count)
 233 {
 234         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 235         int nr = sensor_attr->index;
 236         struct smsc47m192_data *data = dev_get_drvdata(dev);
 237         struct i2c_client *client = data->client;
 238         unsigned long val;
 239         int err;
 240
 241         err = kstrtoul(buf, 10, &val);
 242         if (err)
 243                 return err;
 244
 245         mutex_lock(&data->update_lock);
 246         data->in_max[nr] = IN_TO_REG(val, nr);
 247         i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MAX(nr),
 248                                                         data->in_max[nr]);
 249         mutex_unlock(&data->update_lock);
 250         return count;
 251 }
 252
 253 #define show_in_offset(offset)                                  \
 254 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
 255                 show_in, NULL, offset);                         \
 256 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
 257                 show_in_min, set_in_min, offset);               \
 258 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
 259                 show_in_max, set_in_max, offset);
 260
 261 show_in_offset(0)
 262 show_in_offset(1)
 263 show_in_offset(2)
 264 show_in_offset(3)
 265 show_in_offset(4)
 266 show_in_offset(5)
 267 show_in_offset(6)
 268 show_in_offset(7)
 269
 270 /* Temperatures */
 271 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 272                 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[nr]));
 278 }
 279
 280 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
 281                 char *buf)
 282 {
 283         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 284         int nr = sensor_attr->index;
 285         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 286         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr]));
 287 }
 288
 289 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
 290                 char *buf)
 291 {
 292         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 293         int nr = sensor_attr->index;
 294         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 295         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[nr]));
 296 }
 297
 298 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 299                 const char *buf, size_t count)
 300 {
 301         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 302         int nr = sensor_attr->index;
 303         struct smsc47m192_data *data = dev_get_drvdata(dev);
 304         struct i2c_client *client = data->client;
 305         long val;
 306         int err;
 307
 308         err = kstrtol(buf, 10, &val);
 309         if (err)
 310                 return err;
 311
 312         mutex_lock(&data->update_lock);
 313         data->temp_min[nr] = TEMP_TO_REG(val);
 314         i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr],
 315                                                 data->temp_min[nr]);
 316         mutex_unlock(&data->update_lock);
 317         return count;
 318 }
 319
 320 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 321                 const char *buf, size_t count)
 322 {
 323         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 324         int nr = sensor_attr->index;
 325         struct smsc47m192_data *data = dev_get_drvdata(dev);
 326         struct i2c_client *client = data->client;
 327         long val;
 328         int err;
 329
 330         err = kstrtol(buf, 10, &val);
 331         if (err)
 332                 return err;
 333
 334         mutex_lock(&data->update_lock);
 335         data->temp_max[nr] = TEMP_TO_REG(val);
 336         i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr],
 337                                                 data->temp_max[nr]);
 338         mutex_unlock(&data->update_lock);
 339         return count;
 340 }
 341
 342 static ssize_t show_temp_offset(struct device *dev, struct device_attribute
 343                 *attr, char *buf)
 344 {
 345         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 346         int nr = sensor_attr->index;
 347         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 348         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr]));
 349 }
 350
 351 static ssize_t set_temp_offset(struct device *dev, struct device_attribute
 352                 *attr, const char *buf, size_t count)
 353 {
 354         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 355         int nr = sensor_attr->index;
 356         struct smsc47m192_data *data = dev_get_drvdata(dev);
 357         struct i2c_client *client = data->client;
 358         u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
 359         long val;
 360         int err;
 361
 362         err = kstrtol(buf, 10, &val);
 363         if (err)
 364                 return err;
 365
 366         mutex_lock(&data->update_lock);
 367         data->temp_offset[nr] = TEMP_TO_REG(val);
 368         if (nr > 1)
 369                 i2c_smbus_write_byte_data(client,
 370                         SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
 371         else if (data->temp_offset[nr] != 0) {
 372                 /*
 373                  * offset[0] and offset[1] share the same register,
 374                  * SFR bit 4 activates offset[0]
 375                  */
 376                 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
 377                                         (sfr & 0xef) | (nr == 0 ? 0x10 : 0));
 378                 data->temp_offset[1-nr] = 0;
 379                 i2c_smbus_write_byte_data(client,
 380                         SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
 381         } else if ((sfr & 0x10) == (nr == 0 ? 0x10 : 0))
 382                 i2c_smbus_write_byte_data(client,
 383                                         SMSC47M192_REG_TEMP_OFFSET(nr), 0);
 384         mutex_unlock(&data->update_lock);
 385         return count;
 386 }
 387
 388 #define show_temp_index(index)                                          \
 389 static SENSOR_DEVICE_ATTR(temp##index##_input, S_IRUGO,                 \
 390                 show_temp, NULL, index-1);                              \
 391 static SENSOR_DEVICE_ATTR(temp##index##_min, S_IRUGO | S_IWUSR,         \
 392                 show_temp_min, set_temp_min, index-1);                  \
 393 static SENSOR_DEVICE_ATTR(temp##index##_max, S_IRUGO | S_IWUSR,         \
 394                 show_temp_max, set_temp_max, index-1);                  \
 395 static SENSOR_DEVICE_ATTR(temp##index##_offset, S_IRUGO | S_IWUSR,      \
 396                 show_temp_offset, set_temp_offset, index-1);
 397
 398 show_temp_index(1)
 399 show_temp_index(2)
 400 show_temp_index(3)
 401
 402 /* VID */
 403 static ssize_t cpu0_vid_show(struct device *dev,
 404                              struct device_attribute *attr, char *buf)
 405 {
 406         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 407         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 408 }
 409 static DEVICE_ATTR_RO(cpu0_vid);
 410
 411 static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
 412                 char *buf)
 413 {
 414         struct smsc47m192_data *data = dev_get_drvdata(dev);
 415         return sprintf(buf, "%d\n", data->vrm);
 416 }
 417
 418 static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
 419                          const char *buf, size_t count)
 420 {
 421         struct smsc47m192_data *data = dev_get_drvdata(dev);
 422         unsigned long val;
 423         int err;
 424
 425         err = kstrtoul(buf, 10, &val);
 426         if (err)
 427                 return err;
 428         if (val > 255)
 429                 return -EINVAL;
 430
 431         data->vrm = val;
 432         return count;
 433 }
 434 static DEVICE_ATTR_RW(vrm);
 435
 436 /* Alarms */
 437 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 438                 char *buf)
 439 {
 440         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 441         int nr = sensor_attr->index;
 442         struct smsc47m192_data *data = smsc47m192_update_device(dev);
 443         return sprintf(buf, "%u\n", (data->alarms & nr) ? 1 : 0);
 444 }
 445
 446 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0x0010);
 447 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 0x0020);
 448 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0x0040);
 449 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 0x4000);
 450 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 0x8000);
 451 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0x0001);
 452 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0x0002);
 453 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 0x0004);
 454 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 0x0008);
 455 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 0x0100);
 456 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 0x0200);
 457 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 0x0400);
 458 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 0x0800);
 459
 460 static struct attribute *smsc47m192_attributes[] = {
 461         &sensor_dev_attr_in0_input.dev_attr.attr,
 462         &sensor_dev_attr_in0_min.dev_attr.attr,
 463         &sensor_dev_attr_in0_max.dev_attr.attr,
 464         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 465         &sensor_dev_attr_in1_input.dev_attr.attr,
 466         &sensor_dev_attr_in1_min.dev_attr.attr,
 467         &sensor_dev_attr_in1_max.dev_attr.attr,
 468         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 469         &sensor_dev_attr_in2_input.dev_attr.attr,
 470         &sensor_dev_attr_in2_min.dev_attr.attr,
 471         &sensor_dev_attr_in2_max.dev_attr.attr,
 472         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 473         &sensor_dev_attr_in3_input.dev_attr.attr,
 474         &sensor_dev_attr_in3_min.dev_attr.attr,
 475         &sensor_dev_attr_in3_max.dev_attr.attr,
 476         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 477         &sensor_dev_attr_in5_input.dev_attr.attr,
 478         &sensor_dev_attr_in5_min.dev_attr.attr,
 479         &sensor_dev_attr_in5_max.dev_attr.attr,
 480         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 481         &sensor_dev_attr_in6_input.dev_attr.attr,
 482         &sensor_dev_attr_in6_min.dev_attr.attr,
 483         &sensor_dev_attr_in6_max.dev_attr.attr,
 484         &sensor_dev_attr_in6_alarm.dev_attr.attr,
 485         &sensor_dev_attr_in7_input.dev_attr.attr,
 486         &sensor_dev_attr_in7_min.dev_attr.attr,
 487         &sensor_dev_attr_in7_max.dev_attr.attr,
 488         &sensor_dev_attr_in7_alarm.dev_attr.attr,
 489
 490         &sensor_dev_attr_temp1_input.dev_attr.attr,
 491         &sensor_dev_attr_temp1_max.dev_attr.attr,
 492         &sensor_dev_attr_temp1_min.dev_attr.attr,
 493         &sensor_dev_attr_temp1_offset.dev_attr.attr,
 494         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 495         &sensor_dev_attr_temp2_input.dev_attr.attr,
 496         &sensor_dev_attr_temp2_max.dev_attr.attr,
 497         &sensor_dev_attr_temp2_min.dev_attr.attr,
 498         &sensor_dev_attr_temp2_offset.dev_attr.attr,
 499         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 500         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 501         &sensor_dev_attr_temp3_input.dev_attr.attr,
 502         &sensor_dev_attr_temp3_max.dev_attr.attr,
 503         &sensor_dev_attr_temp3_min.dev_attr.attr,
 504         &sensor_dev_attr_temp3_offset.dev_attr.attr,
 505         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 506         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 507
 508         &dev_attr_cpu0_vid.attr,
 509         &dev_attr_vrm.attr,
 510         NULL
 511 };
 512
 513 static const struct attribute_group smsc47m192_group = {
 514         .attrs = smsc47m192_attributes,
 515 };
 516
 517 static struct attribute *smsc47m192_attributes_in4[] = {
 518         &sensor_dev_attr_in4_input.dev_attr.attr,
 519         &sensor_dev_attr_in4_min.dev_attr.attr,
 520         &sensor_dev_attr_in4_max.dev_attr.attr,
 521         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 522         NULL
 523 };
 524
 525 static const struct attribute_group smsc47m192_group_in4 = {
 526         .attrs = smsc47m192_attributes_in4,
 527 };
 528
 529 static void smsc47m192_init_client(struct i2c_client *client)
 530 {
 531         int i;
 532         u8 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
 533         u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
 534
 535         /* select cycle mode (pause 1 sec between updates) */
 536         i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
 537                                                 (sfr & 0xfd) | 0x02);
 538         if (!(config & 0x01)) {
 539                 /* initialize alarm limits */
 540                 for (i = 0; i < 8; i++) {
 541                         i2c_smbus_write_byte_data(client,
 542                                 SMSC47M192_REG_IN_MIN(i), 0);
 543                         i2c_smbus_write_byte_data(client,
 544                                 SMSC47M192_REG_IN_MAX(i), 0xff);
 545                 }
 546                 for (i = 0; i < 3; i++) {
 547                         i2c_smbus_write_byte_data(client,
 548                                 SMSC47M192_REG_TEMP_MIN[i], 0x80);
 549                         i2c_smbus_write_byte_data(client,
 550                                 SMSC47M192_REG_TEMP_MAX[i], 0x7f);
 551                 }
 552
 553                 /* start monitoring */
 554                 i2c_smbus_write_byte_data(client, SMSC47M192_REG_CONFIG,
 555                                                 (config & 0xf7) | 0x01);
 556         }
 557 }
 558
 559 /* Return 0 if detection is successful, -ENODEV otherwise */
 560 static int smsc47m192_detect(struct i2c_client *client,
 561                              struct i2c_board_info *info)
 562 {
 563         struct i2c_adapter *adapter = client->adapter;
 564         int version;
 565
 566         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 567                 return -ENODEV;
 568
 569         /* Detection criteria from sensors_detect script */
 570         version = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VERSION);
 571         if (i2c_smbus_read_byte_data(client,
 572                                 SMSC47M192_REG_COMPANY_ID) == 0x55
 573          && (version & 0xf0) == 0x20
 574          && (i2c_smbus_read_byte_data(client,
 575                                 SMSC47M192_REG_VID) & 0x70) == 0x00
 576          && (i2c_smbus_read_byte_data(client,
 577                                 SMSC47M192_REG_VID4) & 0xfe) == 0x80) {
 578                 dev_info(&adapter->dev,
 579                          "found SMSC47M192 or compatible, "
 580                          "version 2, stepping A%d\n", version & 0x0f);
 581         } else {
 582                 dev_dbg(&adapter->dev,
 583                         "SMSC47M192 detection failed at 0x%02x\n",
 584                         client->addr);
 585                 return -ENODEV;
 586         }
 587
 588         strlcpy(info->type, "smsc47m192", I2C_NAME_SIZE);
 589
 590         return 0;
 591 }
 592
 593 static int smsc47m192_probe(struct i2c_client *client,
 594                             const struct i2c_device_id *id)
 595 {
 596         struct device *dev = &client->dev;
 597         struct device *hwmon_dev;
 598         struct smsc47m192_data *data;
 599         int config;
 600
 601         data = devm_kzalloc(dev, sizeof(struct smsc47m192_data), GFP_KERNEL);
 602         if (!data)
 603                 return -ENOMEM;
 604
 605         data->client = client;
 606         data->vrm = vid_which_vrm();
 607         mutex_init(&data->update_lock);
 608
 609         /* Initialize the SMSC47M192 chip */
 610         smsc47m192_init_client(client);
 611
 612         /* sysfs hooks */
 613         data->groups[0] = &smsc47m192_group;
 614         /* Pin 110 is either in4 (+12V) or VID4 */
 615         config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
 616         if (!(config & 0x20))
 617                 data->groups[1] = &smsc47m192_group_in4;
 618
 619         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 620                                                            data, data->groups);
 621         return PTR_ERR_OR_ZERO(hwmon_dev);
 622 }
 623
 624 static const struct i2c_device_id smsc47m192_id[] = {
 625         { "smsc47m192", 0 },
 626         { }
 627 };
 628 MODULE_DEVICE_TABLE(i2c, smsc47m192_id);
 629
 630 static struct i2c_driver smsc47m192_driver = {
 631         .class          = I2C_CLASS_HWMON,
 632         .driver = {
 633                 .name   = "smsc47m192",
 634         },
 635         .probe          = smsc47m192_probe,
 636         .id_table       = smsc47m192_id,
 637         .detect         = smsc47m192_detect,
 638         .address_list   = normal_i2c,
 639 };
 640
 641 module_i2c_driver(smsc47m192_driver);
 642
 643 MODULE_AUTHOR("Hartmut Rick <linux@rick.claranet.de>");
 644 MODULE_DESCRIPTION("SMSC47M192 driver");
 645 MODULE_LICENSE("GPL");