drivers/hwmon/emc2103.c

   1 /*
   2  * emc2103.c - Support for SMSC EMC2103
   3  * Copyright (c) 2010 SMSC
   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/init.h>
  22 #include <linux/slab.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/i2c.h>
  25 #include <linux/hwmon.h>
  26 #include <linux/hwmon-sysfs.h>
  27 #include <linux/err.h>
  28 #include <linux/mutex.h>
  29
  30 /* Addresses scanned */
  31 static const unsigned short normal_i2c[] = { 0x2E, I2C_CLIENT_END };
  32
  33 static const u8 REG_TEMP[4] = { 0x00, 0x02, 0x04, 0x06 };
  34 static const u8 REG_TEMP_MIN[4] = { 0x3c, 0x38, 0x39, 0x3a };
  35 static const u8 REG_TEMP_MAX[4] = { 0x34, 0x30, 0x31, 0x32 };
  36
  37 #define REG_CONF1               0x20
  38 #define REG_TEMP_MAX_ALARM      0x24
  39 #define REG_TEMP_MIN_ALARM      0x25
  40 #define REG_FAN_CONF1           0x42
  41 #define REG_FAN_TARGET_LO       0x4c
  42 #define REG_FAN_TARGET_HI       0x4d
  43 #define REG_FAN_TACH_HI         0x4e
  44 #define REG_FAN_TACH_LO         0x4f
  45 #define REG_PRODUCT_ID          0xfd
  46 #define REG_MFG_ID              0xfe
  47
  48 /* equation 4 from datasheet: rpm = (3932160 * multipler) / count */
  49 #define FAN_RPM_FACTOR          3932160
  50
  51 /*
  52  * 2103-2 and 2103-4's 3rd temperature sensor can be connected to two diodes
  53  * in anti-parallel mode, and in this configuration both can be read
  54  * independently (so we have 4 temperature inputs).  The device can't
  55  * detect if it's connected in this mode, so we have to manually enable
  56  * it.  Default is to leave the device in the state it's already in (-1).
  57  * This parameter allows APD mode to be optionally forced on or off
  58  */
  59 static int apd = -1;
  60 module_param(apd, bint, 0);
  61 MODULE_PARM_DESC(init, "Set to zero to disable anti-parallel diode mode");
  62
  63 struct temperature {
  64         s8      degrees;
  65         u8      fraction;       /* 0-7 multiples of 0.125 */
  66 };
  67
  68 struct emc2103_data {
  69         struct device           *hwmon_dev;
  70         struct mutex            update_lock;
  71         bool                    valid;          /* registers are valid */
  72         bool                    fan_rpm_control;
  73         int                     temp_count;     /* num of temp sensors */
  74         unsigned long           last_updated;   /* in jiffies */
  75         struct temperature      temp[4];        /* internal + 3 external */
  76         s8                      temp_min[4];    /* no fractional part */
  77         s8                      temp_max[4];    /* no fractional part */
  78         u8                      temp_min_alarm;
  79         u8                      temp_max_alarm;
  80         u8                      fan_multiplier;
  81         u16                     fan_tach;
  82         u16                     fan_target;
  83 };
  84
  85 static int read_u8_from_i2c(struct i2c_client *client, u8 i2c_reg, u8 *output)
  86 {
  87         int status = i2c_smbus_read_byte_data(client, i2c_reg);
  88         if (status < 0) {
  89                 dev_warn(&client->dev, "reg 0x%02x, err %d\n",
  90                         i2c_reg, status);
  91         } else {
  92                 *output = status;
  93         }
  94         return status;
  95 }
  96
  97 static void read_temp_from_i2c(struct i2c_client *client, u8 i2c_reg,
  98                                struct temperature *temp)
  99 {
 100         u8 degrees, fractional;
 101
 102         if (read_u8_from_i2c(client, i2c_reg, &degrees) < 0)
 103                 return;
 104
 105         if (read_u8_from_i2c(client, i2c_reg + 1, &fractional) < 0)
 106                 return;
 107
 108         temp->degrees = degrees;
 109         temp->fraction = (fractional & 0xe0) >> 5;
 110 }
 111
 112 static void read_fan_from_i2c(struct i2c_client *client, u16 *output,
 113                               u8 hi_addr, u8 lo_addr)
 114 {
 115         u8 high_byte, lo_byte;
 116
 117         if (read_u8_from_i2c(client, hi_addr, &high_byte) < 0)
 118                 return;
 119
 120         if (read_u8_from_i2c(client, lo_addr, &lo_byte) < 0)
 121                 return;
 122
 123         *output = ((u16)high_byte << 5) | (lo_byte >> 3);
 124 }
 125
 126 static void write_fan_target_to_i2c(struct i2c_client *client, u16 new_target)
 127 {
 128         u8 high_byte = (new_target & 0x1fe0) >> 5;
 129         u8 low_byte = (new_target & 0x001f) << 3;
 130         i2c_smbus_write_byte_data(client, REG_FAN_TARGET_LO, low_byte);
 131         i2c_smbus_write_byte_data(client, REG_FAN_TARGET_HI, high_byte);
 132 }
 133
 134 static void read_fan_config_from_i2c(struct i2c_client *client)
 135
 136 {
 137         struct emc2103_data *data = i2c_get_clientdata(client);
 138         u8 conf1;
 139
 140         if (read_u8_from_i2c(client, REG_FAN_CONF1, &conf1) < 0)
 141                 return;
 142
 143         data->fan_multiplier = 1 << ((conf1 & 0x60) >> 5);
 144         data->fan_rpm_control = (conf1 & 0x80) != 0;
 145 }
 146
 147 static struct emc2103_data *emc2103_update_device(struct device *dev)
 148 {
 149         struct i2c_client *client = to_i2c_client(dev);
 150         struct emc2103_data *data = i2c_get_clientdata(client);
 151
 152         mutex_lock(&data->update_lock);
 153
 154         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 155             || !data->valid) {
 156                 int i;
 157
 158                 for (i = 0; i < data->temp_count; i++) {
 159                         read_temp_from_i2c(client, REG_TEMP[i], &data->temp[i]);
 160                         read_u8_from_i2c(client, REG_TEMP_MIN[i],
 161                                 &data->temp_min[i]);
 162                         read_u8_from_i2c(client, REG_TEMP_MAX[i],
 163                                 &data->temp_max[i]);
 164                 }
 165
 166                 read_u8_from_i2c(client, REG_TEMP_MIN_ALARM,
 167                         &data->temp_min_alarm);
 168                 read_u8_from_i2c(client, REG_TEMP_MAX_ALARM,
 169                         &data->temp_max_alarm);
 170
 171                 read_fan_from_i2c(client, &data->fan_tach,
 172                         REG_FAN_TACH_HI, REG_FAN_TACH_LO);
 173                 read_fan_from_i2c(client, &data->fan_target,
 174                         REG_FAN_TARGET_HI, REG_FAN_TARGET_LO);
 175                 read_fan_config_from_i2c(client);
 176
 177                 data->last_updated = jiffies;
 178                 data->valid = true;
 179         }
 180
 181         mutex_unlock(&data->update_lock);
 182
 183         return data;
 184 }
 185
 186 static ssize_t
 187 show_temp(struct device *dev, struct device_attribute *da, char *buf)
 188 {
 189         int nr = to_sensor_dev_attr(da)->index;
 190         struct emc2103_data *data = emc2103_update_device(dev);
 191         int millidegrees = data->temp[nr].degrees * 1000
 192                 + data->temp[nr].fraction * 125;
 193         return sprintf(buf, "%d\n", millidegrees);
 194 }
 195
 196 static ssize_t
 197 show_temp_min(struct device *dev, struct device_attribute *da, char *buf)
 198 {
 199         int nr = to_sensor_dev_attr(da)->index;
 200         struct emc2103_data *data = emc2103_update_device(dev);
 201         int millidegrees = data->temp_min[nr] * 1000;
 202         return sprintf(buf, "%d\n", millidegrees);
 203 }
 204
 205 static ssize_t
 206 show_temp_max(struct device *dev, struct device_attribute *da, char *buf)
 207 {
 208         int nr = to_sensor_dev_attr(da)->index;
 209         struct emc2103_data *data = emc2103_update_device(dev);
 210         int millidegrees = data->temp_max[nr] * 1000;
 211         return sprintf(buf, "%d\n", millidegrees);
 212 }
 213
 214 static ssize_t
 215 show_temp_fault(struct device *dev, struct device_attribute *da, char *buf)
 216 {
 217         int nr = to_sensor_dev_attr(da)->index;
 218         struct emc2103_data *data = emc2103_update_device(dev);
 219         bool fault = (data->temp[nr].degrees == -128);
 220         return sprintf(buf, "%d\n", fault ? 1 : 0);
 221 }
 222
 223 static ssize_t
 224 show_temp_min_alarm(struct device *dev, struct device_attribute *da, char *buf)
 225 {
 226         int nr = to_sensor_dev_attr(da)->index;
 227         struct emc2103_data *data = emc2103_update_device(dev);
 228         bool alarm = data->temp_min_alarm & (1 << nr);
 229         return sprintf(buf, "%d\n", alarm ? 1 : 0);
 230 }
 231
 232 static ssize_t
 233 show_temp_max_alarm(struct device *dev, struct device_attribute *da, char *buf)
 234 {
 235         int nr = to_sensor_dev_attr(da)->index;
 236         struct emc2103_data *data = emc2103_update_device(dev);
 237         bool alarm = data->temp_max_alarm & (1 << nr);
 238         return sprintf(buf, "%d\n", alarm ? 1 : 0);
 239 }
 240
 241 static ssize_t set_temp_min(struct device *dev, struct device_attribute *da,
 242                             const char *buf, size_t count)
 243 {
 244         int nr = to_sensor_dev_attr(da)->index;
 245         struct i2c_client *client = to_i2c_client(dev);
 246         struct emc2103_data *data = i2c_get_clientdata(client);
 247         long val;
 248
 249         int result = kstrtol(buf, 10, &val);
 250         if (result < 0)
 251                 return -EINVAL;
 252
 253         val = DIV_ROUND_CLOSEST(val, 1000);
 254         if ((val < -63) || (val > 127))
 255                 return -EINVAL;
 256
 257         mutex_lock(&data->update_lock);
 258         data->temp_min[nr] = val;
 259         i2c_smbus_write_byte_data(client, REG_TEMP_MIN[nr], val);
 260         mutex_unlock(&data->update_lock);
 261
 262         return count;
 263 }
 264
 265 static ssize_t set_temp_max(struct device *dev, struct device_attribute *da,
 266                             const char *buf, size_t count)
 267 {
 268         int nr = to_sensor_dev_attr(da)->index;
 269         struct i2c_client *client = to_i2c_client(dev);
 270         struct emc2103_data *data = i2c_get_clientdata(client);
 271         long val;
 272
 273         int result = kstrtol(buf, 10, &val);
 274         if (result < 0)
 275                 return -EINVAL;
 276
 277         val = DIV_ROUND_CLOSEST(val, 1000);
 278         if ((val < -63) || (val > 127))
 279                 return -EINVAL;
 280
 281         mutex_lock(&data->update_lock);
 282         data->temp_max[nr] = val;
 283         i2c_smbus_write_byte_data(client, REG_TEMP_MAX[nr], val);
 284         mutex_unlock(&data->update_lock);
 285
 286         return count;
 287 }
 288
 289 static ssize_t
 290 show_fan(struct device *dev, struct device_attribute *da, char *buf)
 291 {
 292         struct emc2103_data *data = emc2103_update_device(dev);
 293         int rpm = 0;
 294         if (data->fan_tach != 0)
 295                 rpm = (FAN_RPM_FACTOR * data->fan_multiplier) / data->fan_tach;
 296         return sprintf(buf, "%d\n", rpm);
 297 }
 298
 299 static ssize_t
 300 show_fan_div(struct device *dev, struct device_attribute *da, char *buf)
 301 {
 302         struct emc2103_data *data = emc2103_update_device(dev);
 303         int fan_div = 8 / data->fan_multiplier;
 304         return sprintf(buf, "%d\n", fan_div);
 305 }
 306
 307 /*
 308  * Note: we also update the fan target here, because its value is
 309  * determined in part by the fan clock divider.  This follows the principle
 310  * of least surprise; the user doesn't expect the fan target to change just
 311  * because the divider changed.
 312  */
 313 static ssize_t set_fan_div(struct device *dev, struct device_attribute *da,
 314                            const char *buf, size_t count)
 315 {
 316         struct emc2103_data *data = emc2103_update_device(dev);
 317         struct i2c_client *client = to_i2c_client(dev);
 318         int new_range_bits, old_div = 8 / data->fan_multiplier;
 319         long new_div;
 320
 321         int status = kstrtol(buf, 10, &new_div);
 322         if (status < 0)
 323                 return -EINVAL;
 324
 325         if (new_div == old_div) /* No change */
 326                 return count;
 327
 328         switch (new_div) {
 329         case 1:
 330                 new_range_bits = 3;
 331                 break;
 332         case 2:
 333                 new_range_bits = 2;
 334                 break;
 335         case 4:
 336                 new_range_bits = 1;
 337                 break;
 338         case 8:
 339                 new_range_bits = 0;
 340                 break;
 341         default:
 342                 return -EINVAL;
 343         }
 344
 345         mutex_lock(&data->update_lock);
 346
 347         status = i2c_smbus_read_byte_data(client, REG_FAN_CONF1);
 348         if (status < 0) {
 349                 dev_dbg(&client->dev, "reg 0x%02x, err %d\n",
 350                         REG_FAN_CONF1, status);
 351                 mutex_unlock(&data->update_lock);
 352                 return -EIO;
 353         }
 354         status &= 0x9F;
 355         status |= (new_range_bits << 5);
 356         i2c_smbus_write_byte_data(client, REG_FAN_CONF1, status);
 357
 358         data->fan_multiplier = 8 / new_div;
 359
 360         /* update fan target if high byte is not disabled */
 361         if ((data->fan_target & 0x1fe0) != 0x1fe0) {
 362                 u16 new_target = (data->fan_target * old_div) / new_div;
 363                 data->fan_target = min(new_target, (u16)0x1fff);
 364                 write_fan_target_to_i2c(client, data->fan_target);
 365         }
 366
 367         /* invalidate data to force re-read from hardware */
 368         data->valid = false;
 369
 370         mutex_unlock(&data->update_lock);
 371         return count;
 372 }
 373
 374 static ssize_t
 375 show_fan_target(struct device *dev, struct device_attribute *da, char *buf)
 376 {
 377         struct emc2103_data *data = emc2103_update_device(dev);
 378         int rpm = 0;
 379
 380         /* high byte of 0xff indicates disabled so return 0 */
 381         if ((data->fan_target != 0) && ((data->fan_target & 0x1fe0) != 0x1fe0))
 382                 rpm = (FAN_RPM_FACTOR * data->fan_multiplier)
 383                         / data->fan_target;
 384
 385         return sprintf(buf, "%d\n", rpm);
 386 }
 387
 388 static ssize_t set_fan_target(struct device *dev, struct device_attribute *da,
 389                               const char *buf, size_t count)
 390 {
 391         struct emc2103_data *data = emc2103_update_device(dev);
 392         struct i2c_client *client = to_i2c_client(dev);
 393         long rpm_target;
 394
 395         int result = kstrtol(buf, 10, &rpm_target);
 396         if (result < 0)
 397                 return -EINVAL;
 398
 399         /* Datasheet states 16384 as maximum RPM target (table 3.2) */
 400         if ((rpm_target < 0) || (rpm_target > 16384))
 401                 return -EINVAL;
 402
 403         mutex_lock(&data->update_lock);
 404
 405         if (rpm_target == 0)
 406                 data->fan_target = 0x1fff;
 407         else
 408                 data->fan_target = SENSORS_LIMIT(
 409                         (FAN_RPM_FACTOR * data->fan_multiplier) / rpm_target,
 410                         0, 0x1fff);
 411
 412         write_fan_target_to_i2c(client, data->fan_target);
 413
 414         mutex_unlock(&data->update_lock);
 415         return count;
 416 }
 417
 418 static ssize_t
 419 show_fan_fault(struct device *dev, struct device_attribute *da, char *buf)
 420 {
 421         struct emc2103_data *data = emc2103_update_device(dev);
 422         bool fault = ((data->fan_tach & 0x1fe0) == 0x1fe0);
 423         return sprintf(buf, "%d\n", fault ? 1 : 0);
 424 }
 425
 426 static ssize_t
 427 show_pwm_enable(struct device *dev, struct device_attribute *da, char *buf)
 428 {
 429         struct emc2103_data *data = emc2103_update_device(dev);
 430         return sprintf(buf, "%d\n", data->fan_rpm_control ? 3 : 0);
 431 }
 432
 433 static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *da,
 434                               const char *buf, size_t count)
 435 {
 436         struct i2c_client *client = to_i2c_client(dev);
 437         struct emc2103_data *data = i2c_get_clientdata(client);
 438         long new_value;
 439         u8 conf_reg;
 440
 441         int result = kstrtol(buf, 10, &new_value);
 442         if (result < 0)
 443                 return -EINVAL;
 444
 445         mutex_lock(&data->update_lock);
 446         switch (new_value) {
 447         case 0:
 448                 data->fan_rpm_control = false;
 449                 break;
 450         case 3:
 451                 data->fan_rpm_control = true;
 452                 break;
 453         default:
 454                 count = -EINVAL;
 455                 goto err;
 456         }
 457
 458         result = read_u8_from_i2c(client, REG_FAN_CONF1, &conf_reg);
 459         if (result) {
 460                 count = result;
 461                 goto err;
 462         }
 463
 464         if (data->fan_rpm_control)
 465                 conf_reg |= 0x80;
 466         else
 467                 conf_reg &= ~0x80;
 468
 469         i2c_smbus_write_byte_data(client, REG_FAN_CONF1, conf_reg);
 470 err:
 471         mutex_unlock(&data->update_lock);
 472         return count;
 473 }
 474
 475 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
 476 static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, show_temp_min,
 477         set_temp_min, 0);
 478 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp_max,
 479         set_temp_max, 0);
 480 static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
 481 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_temp_min_alarm,
 482         NULL, 0);
 483 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_temp_max_alarm,
 484         NULL, 0);
 485
 486 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
 487 static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, show_temp_min,
 488         set_temp_min, 1);
 489 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, show_temp_max,
 490         set_temp_max, 1);
 491 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
 492 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_temp_min_alarm,
 493         NULL, 1);
 494 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_temp_max_alarm,
 495         NULL, 1);
 496
 497 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
 498 static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR, show_temp_min,
 499         set_temp_min, 2);
 500 static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR, show_temp_max,
 501         set_temp_max, 2);
 502 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_temp_fault, NULL, 2);
 503 static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_temp_min_alarm,
 504         NULL, 2);
 505 static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_temp_max_alarm,
 506         NULL, 2);
 507
 508 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
 509 static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO | S_IWUSR, show_temp_min,
 510         set_temp_min, 3);
 511 static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO | S_IWUSR, show_temp_max,
 512         set_temp_max, 3);
 513 static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_temp_fault, NULL, 3);
 514 static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_temp_min_alarm,
 515         NULL, 3);
 516 static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_temp_max_alarm,
 517         NULL, 3);
 518
 519 static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL);
 520 static DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, show_fan_div, set_fan_div);
 521 static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_fan_target,
 522         set_fan_target);
 523 static DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL);
 524
 525 static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
 526         set_pwm_enable);
 527
 528 /* sensors present on all models */
 529 static struct attribute *emc2103_attributes[] = {
 530         &sensor_dev_attr_temp1_input.dev_attr.attr,
 531         &sensor_dev_attr_temp1_min.dev_attr.attr,
 532         &sensor_dev_attr_temp1_max.dev_attr.attr,
 533         &sensor_dev_attr_temp1_fault.dev_attr.attr,
 534         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 535         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 536         &sensor_dev_attr_temp2_input.dev_attr.attr,
 537         &sensor_dev_attr_temp2_min.dev_attr.attr,
 538         &sensor_dev_attr_temp2_max.dev_attr.attr,
 539         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 540         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 541         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 542         &dev_attr_fan1_input.attr,
 543         &dev_attr_fan1_div.attr,
 544         &dev_attr_fan1_target.attr,
 545         &dev_attr_fan1_fault.attr,
 546         &dev_attr_pwm1_enable.attr,
 547         NULL
 548 };
 549
 550 /* extra temperature sensors only present on 2103-2 and 2103-4 */
 551 static struct attribute *emc2103_attributes_temp3[] = {
 552         &sensor_dev_attr_temp3_input.dev_attr.attr,
 553         &sensor_dev_attr_temp3_min.dev_attr.attr,
 554         &sensor_dev_attr_temp3_max.dev_attr.attr,
 555         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 556         &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
 557         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 558         NULL
 559 };
 560
 561 /* extra temperature sensors only present on 2103-2 and 2103-4 in APD mode */
 562 static struct attribute *emc2103_attributes_temp4[] = {
 563         &sensor_dev_attr_temp4_input.dev_attr.attr,
 564         &sensor_dev_attr_temp4_min.dev_attr.attr,
 565         &sensor_dev_attr_temp4_max.dev_attr.attr,
 566         &sensor_dev_attr_temp4_fault.dev_attr.attr,
 567         &sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
 568         &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 569         NULL
 570 };
 571
 572 static const struct attribute_group emc2103_group = {
 573         .attrs = emc2103_attributes,
 574 };
 575
 576 static const struct attribute_group emc2103_temp3_group = {
 577         .attrs = emc2103_attributes_temp3,
 578 };
 579
 580 static const struct attribute_group emc2103_temp4_group = {
 581         .attrs = emc2103_attributes_temp4,
 582 };
 583
 584 static int
 585 emc2103_probe(struct i2c_client *client, const struct i2c_device_id *id)
 586 {
 587         struct emc2103_data *data;
 588         int status;
 589
 590         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 591                 return -EIO;
 592
 593         data = devm_kzalloc(&client->dev, sizeof(struct emc2103_data),
 594                             GFP_KERNEL);
 595         if (!data)
 596                 return -ENOMEM;
 597
 598         i2c_set_clientdata(client, data);
 599         mutex_init(&data->update_lock);
 600
 601         /* 2103-2 and 2103-4 have 3 external diodes, 2103-1 has 1 */
 602         status = i2c_smbus_read_byte_data(client, REG_PRODUCT_ID);
 603         if (status == 0x24) {
 604                 /* 2103-1 only has 1 external diode */
 605                 data->temp_count = 2;
 606         } else {
 607                 /* 2103-2 and 2103-4 have 3 or 4 external diodes */
 608                 status = i2c_smbus_read_byte_data(client, REG_CONF1);
 609                 if (status < 0) {
 610                         dev_dbg(&client->dev, "reg 0x%02x, err %d\n", REG_CONF1,
 611                                 status);
 612                         return status;
 613                 }
 614
 615                 /* detect current state of hardware */
 616                 data->temp_count = (status & 0x01) ? 4 : 3;
 617
 618                 /* force APD state if module parameter is set */
 619                 if (apd == 0) {
 620                         /* force APD mode off */
 621                         data->temp_count = 3;
 622                         status &= ~(0x01);
 623                         i2c_smbus_write_byte_data(client, REG_CONF1, status);
 624                 } else if (apd == 1) {
 625                         /* force APD mode on */
 626                         data->temp_count = 4;
 627                         status |= 0x01;
 628                         i2c_smbus_write_byte_data(client, REG_CONF1, status);
 629                 }
 630         }
 631
 632         /* Register sysfs hooks */
 633         status = sysfs_create_group(&client->dev.kobj, &emc2103_group);
 634         if (status)
 635                 return status;
 636
 637         if (data->temp_count >= 3) {
 638                 status = sysfs_create_group(&client->dev.kobj,
 639                         &emc2103_temp3_group);
 640                 if (status)
 641                         goto exit_remove;
 642         }
 643
 644         if (data->temp_count == 4) {
 645                 status = sysfs_create_group(&client->dev.kobj,
 646                         &emc2103_temp4_group);
 647                 if (status)
 648                         goto exit_remove_temp3;
 649         }
 650
 651         data->hwmon_dev = hwmon_device_register(&client->dev);
 652         if (IS_ERR(data->hwmon_dev)) {
 653                 status = PTR_ERR(data->hwmon_dev);
 654                 goto exit_remove_temp4;
 655         }
 656
 657         dev_info(&client->dev, "%s: sensor '%s'\n",
 658                  dev_name(data->hwmon_dev), client->name);
 659
 660         return 0;
 661
 662 exit_remove_temp4:
 663         if (data->temp_count == 4)
 664                 sysfs_remove_group(&client->dev.kobj, &emc2103_temp4_group);
 665 exit_remove_temp3:
 666         if (data->temp_count >= 3)
 667                 sysfs_remove_group(&client->dev.kobj, &emc2103_temp3_group);
 668 exit_remove:
 669         sysfs_remove_group(&client->dev.kobj, &emc2103_group);
 670         return status;
 671 }
 672
 673 static int emc2103_remove(struct i2c_client *client)
 674 {
 675         struct emc2103_data *data = i2c_get_clientdata(client);
 676
 677         hwmon_device_unregister(data->hwmon_dev);
 678
 679         if (data->temp_count == 4)
 680                 sysfs_remove_group(&client->dev.kobj, &emc2103_temp4_group);
 681
 682         if (data->temp_count >= 3)
 683                 sysfs_remove_group(&client->dev.kobj, &emc2103_temp3_group);
 684
 685         sysfs_remove_group(&client->dev.kobj, &emc2103_group);
 686
 687         return 0;
 688 }
 689
 690 static const struct i2c_device_id emc2103_ids[] = {
 691         { "emc2103", 0, },
 692         { /* LIST END */ }
 693 };
 694 MODULE_DEVICE_TABLE(i2c, emc2103_ids);
 695
 696 /* Return 0 if detection is successful, -ENODEV otherwise */
 697 static int
 698 emc2103_detect(struct i2c_client *new_client, struct i2c_board_info *info)
 699 {
 700         struct i2c_adapter *adapter = new_client->adapter;
 701         int manufacturer, product;
 702
 703         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 704                 return -ENODEV;
 705
 706         manufacturer = i2c_smbus_read_byte_data(new_client, REG_MFG_ID);
 707         if (manufacturer != 0x5D)
 708                 return -ENODEV;
 709
 710         product = i2c_smbus_read_byte_data(new_client, REG_PRODUCT_ID);
 711         if ((product != 0x24) && (product != 0x26))
 712                 return -ENODEV;
 713
 714         strlcpy(info->type, "emc2103", I2C_NAME_SIZE);
 715
 716         return 0;
 717 }
 718
 719 static struct i2c_driver emc2103_driver = {
 720         .class          = I2C_CLASS_HWMON,
 721         .driver = {
 722                 .name   = "emc2103",
 723         },
 724         .probe          = emc2103_probe,
 725         .remove         = emc2103_remove,
 726         .id_table       = emc2103_ids,
 727         .detect         = emc2103_detect,
 728         .address_list   = normal_i2c,
 729 };
 730
 731 module_i2c_driver(emc2103_driver);
 732
 733 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
 734 MODULE_DESCRIPTION("SMSC EMC2103 hwmon driver");
 735 MODULE_LICENSE("GPL");