drivers/hwmon/adt7411.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Driver for the ADT7411 (I2C/SPI 8 channel 10 bit ADC & temperature-sensor)
   4  *
   5  *  Copyright (C) 2008, 2010 Pengutronix
   6  *
   7  *  TODO: SPI, use power-down mode for suspend?, interrupt handling?
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/err.h>
  14 #include <linux/mutex.h>
  15 #include <linux/jiffies.h>
  16 #include <linux/i2c.h>
  17 #include <linux/hwmon.h>
  18 #include <linux/hwmon-sysfs.h>
  19 #include <linux/slab.h>
  20
  21 #define ADT7411_REG_STAT_1                      0x00
  22 #define ADT7411_STAT_1_INT_TEMP_HIGH            BIT(0)
  23 #define ADT7411_STAT_1_INT_TEMP_LOW             BIT(1)
  24 #define ADT7411_STAT_1_EXT_TEMP_HIGH_AIN1       BIT(2)
  25 #define ADT7411_STAT_1_EXT_TEMP_LOW             BIT(3)
  26 #define ADT7411_STAT_1_EXT_TEMP_FAULT           BIT(4)
  27 #define ADT7411_STAT_1_AIN2                     BIT(5)
  28 #define ADT7411_STAT_1_AIN3                     BIT(6)
  29 #define ADT7411_STAT_1_AIN4                     BIT(7)
  30 #define ADT7411_REG_STAT_2                      0x01
  31 #define ADT7411_STAT_2_AIN5                     BIT(0)
  32 #define ADT7411_STAT_2_AIN6                     BIT(1)
  33 #define ADT7411_STAT_2_AIN7                     BIT(2)
  34 #define ADT7411_STAT_2_AIN8                     BIT(3)
  35 #define ADT7411_STAT_2_VDD                      BIT(4)
  36 #define ADT7411_REG_INT_TEMP_VDD_LSB            0x03
  37 #define ADT7411_REG_EXT_TEMP_AIN14_LSB          0x04
  38 #define ADT7411_REG_VDD_MSB                     0x06
  39 #define ADT7411_REG_INT_TEMP_MSB                0x07
  40 #define ADT7411_REG_EXT_TEMP_AIN1_MSB           0x08
  41
  42 #define ADT7411_REG_CFG1                        0x18
  43 #define ADT7411_CFG1_START_MONITOR              BIT(0)
  44 #define ADT7411_CFG1_RESERVED_BIT1              BIT(1)
  45 #define ADT7411_CFG1_EXT_TDM                    BIT(2)
  46 #define ADT7411_CFG1_RESERVED_BIT3              BIT(3)
  47
  48 #define ADT7411_REG_CFG2                        0x19
  49 #define ADT7411_CFG2_DISABLE_AVG                BIT(5)
  50
  51 #define ADT7411_REG_CFG3                        0x1a
  52 #define ADT7411_CFG3_ADC_CLK_225                BIT(0)
  53 #define ADT7411_CFG3_RESERVED_BIT1              BIT(1)
  54 #define ADT7411_CFG3_RESERVED_BIT2              BIT(2)
  55 #define ADT7411_CFG3_RESERVED_BIT3              BIT(3)
  56 #define ADT7411_CFG3_REF_VDD                    BIT(4)
  57
  58 #define ADT7411_REG_VDD_HIGH                    0x23
  59 #define ADT7411_REG_VDD_LOW                     0x24
  60 #define ADT7411_REG_TEMP_HIGH(nr)               (0x25 + 2 * (nr))
  61 #define ADT7411_REG_TEMP_LOW(nr)                (0x26 + 2 * (nr))
  62 #define ADT7411_REG_IN_HIGH(nr)         ((nr) > 1 \
  63                                                   ? 0x2b + 2 * ((nr)-2) \
  64                                                   : 0x27)
  65 #define ADT7411_REG_IN_LOW(nr)                  ((nr) > 1 \
  66                                                   ? 0x2c + 2 * ((nr)-2) \
  67                                                   : 0x28)
  68
  69 #define ADT7411_REG_DEVICE_ID                   0x4d
  70 #define ADT7411_REG_MANUFACTURER_ID             0x4e
  71
  72 #define ADT7411_DEVICE_ID                       0x2
  73 #define ADT7411_MANUFACTURER_ID                 0x41
  74
  75 static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END };
  76
  77 static const u8 adt7411_in_alarm_reg[] = {
  78         ADT7411_REG_STAT_2,
  79         ADT7411_REG_STAT_1,
  80         ADT7411_REG_STAT_1,
  81         ADT7411_REG_STAT_1,
  82         ADT7411_REG_STAT_1,
  83         ADT7411_REG_STAT_2,
  84         ADT7411_REG_STAT_2,
  85         ADT7411_REG_STAT_2,
  86         ADT7411_REG_STAT_2,
  87 };
  88
  89 static const u8 adt7411_in_alarm_bits[] = {
  90         ADT7411_STAT_2_VDD,
  91         ADT7411_STAT_1_EXT_TEMP_HIGH_AIN1,
  92         ADT7411_STAT_1_AIN2,
  93         ADT7411_STAT_1_AIN3,
  94         ADT7411_STAT_1_AIN4,
  95         ADT7411_STAT_2_AIN5,
  96         ADT7411_STAT_2_AIN6,
  97         ADT7411_STAT_2_AIN7,
  98         ADT7411_STAT_2_AIN8,
  99 };
 100
 101 struct adt7411_data {
 102         struct mutex device_lock;       /* for "atomic" device accesses */
 103         struct mutex update_lock;
 104         unsigned long next_update;
 105         long vref_cached;
 106         struct i2c_client *client;
 107         bool use_ext_temp;
 108 };
 109
 110 /*
 111  * When reading a register containing (up to 4) lsb, all associated
 112  * msb-registers get locked by the hardware. After _one_ of those msb is read,
 113  * _all_ are unlocked. In order to use this locking correctly, reading lsb/msb
 114  * is protected here with a mutex, too.
 115  */
 116 static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg,
 117                                 u8 msb_reg, u8 lsb_shift)
 118 {
 119         struct adt7411_data *data = i2c_get_clientdata(client);
 120         int val, tmp;
 121
 122         mutex_lock(&data->device_lock);
 123
 124         val = i2c_smbus_read_byte_data(client, lsb_reg);
 125         if (val < 0)
 126                 goto exit_unlock;
 127
 128         tmp = (val >> lsb_shift) & 3;
 129         val = i2c_smbus_read_byte_data(client, msb_reg);
 130
 131         if (val >= 0)
 132                 val = (val << 2) | tmp;
 133
 134  exit_unlock:
 135         mutex_unlock(&data->device_lock);
 136
 137         return val;
 138 }
 139
 140 static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit,
 141                                 bool flag)
 142 {
 143         struct adt7411_data *data = i2c_get_clientdata(client);
 144         int ret, val;
 145
 146         mutex_lock(&data->device_lock);
 147
 148         ret = i2c_smbus_read_byte_data(client, reg);
 149         if (ret < 0)
 150                 goto exit_unlock;
 151
 152         if (flag)
 153                 val = ret | bit;
 154         else
 155                 val = ret & ~bit;
 156
 157         ret = i2c_smbus_write_byte_data(client, reg, val);
 158
 159  exit_unlock:
 160         mutex_unlock(&data->device_lock);
 161         return ret;
 162 }
 163
 164 static ssize_t adt7411_show_bit(struct device *dev,
 165                                 struct device_attribute *attr, char *buf)
 166 {
 167         struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
 168         struct adt7411_data *data = dev_get_drvdata(dev);
 169         struct i2c_client *client = data->client;
 170         int ret = i2c_smbus_read_byte_data(client, attr2->index);
 171
 172         return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr));
 173 }
 174
 175 static ssize_t adt7411_set_bit(struct device *dev,
 176                                struct device_attribute *attr, const char *buf,
 177                                size_t count)
 178 {
 179         struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr);
 180         struct adt7411_data *data = dev_get_drvdata(dev);
 181         struct i2c_client *client = data->client;
 182         int ret;
 183         unsigned long flag;
 184
 185         ret = kstrtoul(buf, 0, &flag);
 186         if (ret || flag > 1)
 187                 return -EINVAL;
 188
 189         ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag);
 190
 191         /* force update */
 192         mutex_lock(&data->update_lock);
 193         data->next_update = jiffies;
 194         mutex_unlock(&data->update_lock);
 195
 196         return ret < 0 ? ret : count;
 197 }
 198
 199 #define ADT7411_BIT_ATTR(__name, __reg, __bit) \
 200         SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \
 201         adt7411_set_bit, __bit, __reg)
 202
 203 static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG);
 204 static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225);
 205 static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD);
 206
 207 static struct attribute *adt7411_attrs[] = {
 208         &sensor_dev_attr_no_average.dev_attr.attr,
 209         &sensor_dev_attr_fast_sampling.dev_attr.attr,
 210         &sensor_dev_attr_adc_ref_vdd.dev_attr.attr,
 211         NULL
 212 };
 213 ATTRIBUTE_GROUPS(adt7411);
 214
 215 static int adt7411_read_in_alarm(struct device *dev, int channel, long *val)
 216 {
 217         struct adt7411_data *data = dev_get_drvdata(dev);
 218         struct i2c_client *client = data->client;
 219         int ret;
 220
 221         ret = i2c_smbus_read_byte_data(client, adt7411_in_alarm_reg[channel]);
 222         if (ret < 0)
 223                 return ret;
 224         *val = !!(ret & adt7411_in_alarm_bits[channel]);
 225         return 0;
 226 }
 227
 228 static int adt7411_read_in_vdd(struct device *dev, u32 attr, long *val)
 229 {
 230         struct adt7411_data *data = dev_get_drvdata(dev);
 231         struct i2c_client *client = data->client;
 232         int ret;
 233
 234         switch (attr) {
 235         case hwmon_in_input:
 236                 ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
 237                                           ADT7411_REG_VDD_MSB, 2);
 238                 if (ret < 0)
 239                         return ret;
 240                 *val = ret * 7000 / 1024;
 241                 return 0;
 242         case hwmon_in_min:
 243                 ret = i2c_smbus_read_byte_data(client, ADT7411_REG_VDD_LOW);
 244                 if (ret < 0)
 245                         return ret;
 246                 *val = ret * 7000 / 256;
 247                 return 0;
 248         case hwmon_in_max:
 249                 ret = i2c_smbus_read_byte_data(client, ADT7411_REG_VDD_HIGH);
 250                 if (ret < 0)
 251                         return ret;
 252                 *val = ret * 7000 / 256;
 253                 return 0;
 254         case hwmon_in_alarm:
 255                 return adt7411_read_in_alarm(dev, 0, val);
 256         default:
 257                 return -EOPNOTSUPP;
 258         }
 259 }
 260
 261 static int adt7411_update_vref(struct device *dev)
 262 {
 263         struct adt7411_data *data = dev_get_drvdata(dev);
 264         struct i2c_client *client = data->client;
 265         int val;
 266
 267         if (time_after_eq(jiffies, data->next_update)) {
 268                 val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3);
 269                 if (val < 0)
 270                         return val;
 271
 272                 if (val & ADT7411_CFG3_REF_VDD) {
 273                         val = adt7411_read_in_vdd(dev, hwmon_in_input,
 274                                                   &data->vref_cached);
 275                         if (val < 0)
 276                                 return val;
 277                 } else {
 278                         data->vref_cached = 2250;
 279                 }
 280
 281                 data->next_update = jiffies + HZ;
 282         }
 283
 284         return 0;
 285 }
 286
 287 static int adt7411_read_in_chan(struct device *dev, u32 attr, int channel,
 288                                 long *val)
 289 {
 290         struct adt7411_data *data = dev_get_drvdata(dev);
 291         struct i2c_client *client = data->client;
 292
 293         int ret;
 294         int reg, lsb_reg, lsb_shift;
 295         int nr = channel - 1;
 296
 297         mutex_lock(&data->update_lock);
 298         ret = adt7411_update_vref(dev);
 299         if (ret < 0)
 300                 goto exit_unlock;
 301
 302         switch (attr) {
 303         case hwmon_in_input:
 304                 lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2);
 305                 lsb_shift = 2 * (nr & 0x03);
 306                 ret = adt7411_read_10_bit(client, lsb_reg,
 307                                           ADT7411_REG_EXT_TEMP_AIN1_MSB + nr,
 308                                           lsb_shift);
 309                 if (ret < 0)
 310                         goto exit_unlock;
 311                 *val = ret * data->vref_cached / 1024;
 312                 ret = 0;
 313                 break;
 314         case hwmon_in_min:
 315         case hwmon_in_max:
 316                 reg = (attr == hwmon_in_min)
 317                         ? ADT7411_REG_IN_LOW(channel)
 318                         : ADT7411_REG_IN_HIGH(channel);
 319                 ret = i2c_smbus_read_byte_data(client, reg);
 320                 if (ret < 0)
 321                         goto exit_unlock;
 322                 *val = ret * data->vref_cached / 256;
 323                 ret = 0;
 324                 break;
 325         case hwmon_in_alarm:
 326                 ret = adt7411_read_in_alarm(dev, channel, val);
 327                 break;
 328         default:
 329                 ret = -EOPNOTSUPP;
 330                 break;
 331         }
 332  exit_unlock:
 333         mutex_unlock(&data->update_lock);
 334         return ret;
 335 }
 336
 337 static int adt7411_read_in(struct device *dev, u32 attr, int channel,
 338                            long *val)
 339 {
 340         if (channel == 0)
 341                 return adt7411_read_in_vdd(dev, attr, val);
 342         else
 343                 return adt7411_read_in_chan(dev, attr, channel, val);
 344 }
 345
 346
 347 static int adt7411_read_temp_alarm(struct device *dev, u32 attr, int channel,
 348                                    long *val)
 349 {
 350         struct adt7411_data *data = dev_get_drvdata(dev);
 351         struct i2c_client *client = data->client;
 352         int ret, bit;
 353
 354         ret = i2c_smbus_read_byte_data(client, ADT7411_REG_STAT_1);
 355         if (ret < 0)
 356                 return ret;
 357
 358         switch (attr) {
 359         case hwmon_temp_min_alarm:
 360                 bit = channel ? ADT7411_STAT_1_EXT_TEMP_LOW
 361                               : ADT7411_STAT_1_INT_TEMP_LOW;
 362                 break;
 363         case hwmon_temp_max_alarm:
 364                 bit = channel ? ADT7411_STAT_1_EXT_TEMP_HIGH_AIN1
 365                               : ADT7411_STAT_1_INT_TEMP_HIGH;
 366                 break;
 367         case hwmon_temp_fault:
 368                 bit = ADT7411_STAT_1_EXT_TEMP_FAULT;
 369                 break;
 370         default:
 371                 return -EOPNOTSUPP;
 372         }
 373
 374         *val = !!(ret & bit);
 375         return 0;
 376 }
 377
 378 static int adt7411_read_temp(struct device *dev, u32 attr, int channel,
 379                              long *val)
 380 {
 381         struct adt7411_data *data = dev_get_drvdata(dev);
 382         struct i2c_client *client = data->client;
 383         int ret, reg, regl, regh;
 384
 385         switch (attr) {
 386         case hwmon_temp_input:
 387                 regl = channel ? ADT7411_REG_EXT_TEMP_AIN14_LSB :
 388                                  ADT7411_REG_INT_TEMP_VDD_LSB;
 389                 regh = channel ? ADT7411_REG_EXT_TEMP_AIN1_MSB :
 390                                  ADT7411_REG_INT_TEMP_MSB;
 391                 ret = adt7411_read_10_bit(client, regl, regh, 0);
 392                 if (ret < 0)
 393                         return ret;
 394                 ret = ret & 0x200 ? ret - 0x400 : ret; /* 10 bit signed */
 395                 *val = ret * 250;
 396                 return 0;
 397         case hwmon_temp_min:
 398         case hwmon_temp_max:
 399                 reg = (attr == hwmon_temp_min)
 400                         ? ADT7411_REG_TEMP_LOW(channel)
 401                         : ADT7411_REG_TEMP_HIGH(channel);
 402                 ret = i2c_smbus_read_byte_data(client, reg);
 403                 if (ret < 0)
 404                         return ret;
 405                 ret = ret & 0x80 ? ret - 0x100 : ret; /* 8 bit signed */
 406                 *val = ret * 1000;
 407                 return 0;
 408         case hwmon_temp_min_alarm:
 409         case hwmon_temp_max_alarm:
 410         case hwmon_temp_fault:
 411                 return adt7411_read_temp_alarm(dev, attr, channel, val);
 412         default:
 413                 return -EOPNOTSUPP;
 414         }
 415 }
 416
 417 static int adt7411_read(struct device *dev, enum hwmon_sensor_types type,
 418                         u32 attr, int channel, long *val)
 419 {
 420         switch (type) {
 421         case hwmon_in:
 422                 return adt7411_read_in(dev, attr, channel, val);
 423         case hwmon_temp:
 424                 return adt7411_read_temp(dev, attr, channel, val);
 425         default:
 426                 return -EOPNOTSUPP;
 427         }
 428 }
 429
 430 static int adt7411_write_in_vdd(struct device *dev, u32 attr, long val)
 431 {
 432         struct adt7411_data *data = dev_get_drvdata(dev);
 433         struct i2c_client *client = data->client;
 434         int reg;
 435
 436         val = clamp_val(val, 0, 255 * 7000 / 256);
 437         val = DIV_ROUND_CLOSEST(val * 256, 7000);
 438
 439         switch (attr) {
 440         case hwmon_in_min:
 441                 reg = ADT7411_REG_VDD_LOW;
 442                 break;
 443         case hwmon_in_max:
 444                 reg = ADT7411_REG_VDD_HIGH;
 445                 break;
 446         default:
 447                 return -EOPNOTSUPP;
 448         }
 449
 450         return i2c_smbus_write_byte_data(client, reg, val);
 451 }
 452
 453 static int adt7411_write_in_chan(struct device *dev, u32 attr, int channel,
 454                                  long val)
 455 {
 456         struct adt7411_data *data = dev_get_drvdata(dev);
 457         struct i2c_client *client = data->client;
 458         int ret, reg;
 459
 460         mutex_lock(&data->update_lock);
 461         ret = adt7411_update_vref(dev);
 462         if (ret < 0)
 463                 goto exit_unlock;
 464         val = clamp_val(val, 0, 255 * data->vref_cached / 256);
 465         val = DIV_ROUND_CLOSEST(val * 256, data->vref_cached);
 466
 467         switch (attr) {
 468         case hwmon_in_min:
 469                 reg = ADT7411_REG_IN_LOW(channel);
 470                 break;
 471         case hwmon_in_max:
 472                 reg = ADT7411_REG_IN_HIGH(channel);
 473                 break;
 474         default:
 475                 ret = -EOPNOTSUPP;
 476                 goto exit_unlock;
 477         }
 478
 479         ret = i2c_smbus_write_byte_data(client, reg, val);
 480  exit_unlock:
 481         mutex_unlock(&data->update_lock);
 482         return ret;
 483 }
 484
 485 static int adt7411_write_in(struct device *dev, u32 attr, int channel,
 486                             long val)
 487 {
 488         if (channel == 0)
 489                 return adt7411_write_in_vdd(dev, attr, val);
 490         else
 491                 return adt7411_write_in_chan(dev, attr, channel, val);
 492 }
 493
 494 static int adt7411_write_temp(struct device *dev, u32 attr, int channel,
 495                               long val)
 496 {
 497         struct adt7411_data *data = dev_get_drvdata(dev);
 498         struct i2c_client *client = data->client;
 499         int reg;
 500
 501         val = clamp_val(val, -128000, 127000);
 502         val = DIV_ROUND_CLOSEST(val, 1000);
 503
 504         switch (attr) {
 505         case hwmon_temp_min:
 506                 reg = ADT7411_REG_TEMP_LOW(channel);
 507                 break;
 508         case hwmon_temp_max:
 509                 reg = ADT7411_REG_TEMP_HIGH(channel);
 510                 break;
 511         default:
 512                 return -EOPNOTSUPP;
 513         }
 514
 515         return i2c_smbus_write_byte_data(client, reg, val);
 516 }
 517
 518 static int adt7411_write(struct device *dev, enum hwmon_sensor_types type,
 519                          u32 attr, int channel, long val)
 520 {
 521         switch (type) {
 522         case hwmon_in:
 523                 return adt7411_write_in(dev, attr, channel, val);
 524         case hwmon_temp:
 525                 return adt7411_write_temp(dev, attr, channel, val);
 526         default:
 527                 return -EOPNOTSUPP;
 528         }
 529 }
 530
 531 static umode_t adt7411_is_visible(const void *_data,
 532                                   enum hwmon_sensor_types type,
 533                                   u32 attr, int channel)
 534 {
 535         const struct adt7411_data *data = _data;
 536         bool visible;
 537
 538         switch (type) {
 539         case hwmon_in:
 540                 visible = channel == 0 || channel >= 3 || !data->use_ext_temp;
 541                 switch (attr) {
 542                 case hwmon_in_input:
 543                 case hwmon_in_alarm:
 544                         return visible ? S_IRUGO : 0;
 545                 case hwmon_in_min:
 546                 case hwmon_in_max:
 547                         return visible ? S_IRUGO | S_IWUSR : 0;
 548                 }
 549                 break;
 550         case hwmon_temp:
 551                 visible = channel == 0 || data->use_ext_temp;
 552                 switch (attr) {
 553                 case hwmon_temp_input:
 554                 case hwmon_temp_min_alarm:
 555                 case hwmon_temp_max_alarm:
 556                 case hwmon_temp_fault:
 557                         return visible ? S_IRUGO : 0;
 558                 case hwmon_temp_min:
 559                 case hwmon_temp_max:
 560                         return visible ? S_IRUGO | S_IWUSR : 0;
 561                 }
 562                 break;
 563         default:
 564                 break;
 565         }
 566         return 0;
 567 }
 568
 569 static int adt7411_detect(struct i2c_client *client,
 570                           struct i2c_board_info *info)
 571 {
 572         int val;
 573
 574         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 575                 return -ENODEV;
 576
 577         val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID);
 578         if (val < 0 || val != ADT7411_MANUFACTURER_ID) {
 579                 dev_dbg(&client->dev,
 580                         "Wrong manufacturer ID. Got %d, expected %d\n",
 581                         val, ADT7411_MANUFACTURER_ID);
 582                 return -ENODEV;
 583         }
 584
 585         val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID);
 586         if (val < 0 || val != ADT7411_DEVICE_ID) {
 587                 dev_dbg(&client->dev,
 588                         "Wrong device ID. Got %d, expected %d\n",
 589                         val, ADT7411_DEVICE_ID);
 590                 return -ENODEV;
 591         }
 592
 593         strlcpy(info->type, "adt7411", I2C_NAME_SIZE);
 594
 595         return 0;
 596 }
 597
 598 static int adt7411_init_device(struct adt7411_data *data)
 599 {
 600         int ret;
 601         u8 val;
 602
 603         ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG3);
 604         if (ret < 0)
 605                 return ret;
 606
 607         /*
 608          * We must only write zero to bit 1 and bit 2 and only one to bit 3
 609          * according to the datasheet.
 610          */
 611         val = ret;
 612         val &= ~(ADT7411_CFG3_RESERVED_BIT1 | ADT7411_CFG3_RESERVED_BIT2);
 613         val |= ADT7411_CFG3_RESERVED_BIT3;
 614
 615         ret = i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG3, val);
 616         if (ret < 0)
 617                 return ret;
 618
 619         ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG1);
 620         if (ret < 0)
 621                 return ret;
 622
 623         data->use_ext_temp = ret & ADT7411_CFG1_EXT_TDM;
 624
 625         /*
 626          * We must only write zero to bit 1 and only one to bit 3 according to
 627          * the datasheet.
 628          */
 629         val = ret;
 630         val &= ~ADT7411_CFG1_RESERVED_BIT1;
 631         val |= ADT7411_CFG1_RESERVED_BIT3;
 632
 633         /* enable monitoring */
 634         val |= ADT7411_CFG1_START_MONITOR;
 635
 636         return i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG1, val);
 637 }
 638
 639 static const struct hwmon_channel_info *adt7411_info[] = {
 640         HWMON_CHANNEL_INFO(in,
 641                            HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
 642                            HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
 643                            HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
 644                            HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
 645                            HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
 646                            HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
 647                            HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
 648                            HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
 649                            HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM),
 650         HWMON_CHANNEL_INFO(temp,
 651                            HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MIN_ALARM |
 652                            HWMON_T_MAX | HWMON_T_MAX_ALARM,
 653                            HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MIN_ALARM |
 654                            HWMON_T_MAX | HWMON_T_MAX_ALARM | HWMON_T_FAULT),
 655         NULL
 656 };
 657
 658 static const struct hwmon_ops adt7411_hwmon_ops = {
 659         .is_visible = adt7411_is_visible,
 660         .read = adt7411_read,
 661         .write = adt7411_write,
 662 };
 663
 664 static const struct hwmon_chip_info adt7411_chip_info = {
 665         .ops = &adt7411_hwmon_ops,
 666         .info = adt7411_info,
 667 };
 668
 669 static int adt7411_probe(struct i2c_client *client,
 670                                    const struct i2c_device_id *id)
 671 {
 672         struct device *dev = &client->dev;
 673         struct adt7411_data *data;
 674         struct device *hwmon_dev;
 675         int ret;
 676
 677         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 678         if (!data)
 679                 return -ENOMEM;
 680
 681         i2c_set_clientdata(client, data);
 682         data->client = client;
 683         mutex_init(&data->device_lock);
 684         mutex_init(&data->update_lock);
 685
 686         ret = adt7411_init_device(data);
 687         if (ret < 0)
 688                 return ret;
 689
 690         /* force update on first occasion */
 691         data->next_update = jiffies;
 692
 693         hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
 694                                                          data,
 695                                                          &adt7411_chip_info,
 696                                                          adt7411_groups);
 697         return PTR_ERR_OR_ZERO(hwmon_dev);
 698 }
 699
 700 static const struct i2c_device_id adt7411_id[] = {
 701         { "adt7411", 0 },
 702         { }
 703 };
 704 MODULE_DEVICE_TABLE(i2c, adt7411_id);
 705
 706 static struct i2c_driver adt7411_driver = {
 707         .driver         = {
 708                 .name           = "adt7411",
 709         },
 710         .probe  = adt7411_probe,
 711         .id_table = adt7411_id,
 712         .detect = adt7411_detect,
 713         .address_list = normal_i2c,
 714         .class = I2C_CLASS_HWMON,
 715 };
 716
 717 module_i2c_driver(adt7411_driver);
 718
 719 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and "
 720         "Wolfram Sang <w.sang@pengutronix.de>");
 721 MODULE_DESCRIPTION("ADT7411 driver");
 722 MODULE_LICENSE("GPL v2");