drivers/hwmon/tmp401.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* tmp401.c
   3  *
   4  * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>
   5  * Preliminary tmp411 support by:
   6  * Gabriel Konat, Sander Leget, Wouter Willems
   7  * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>
   8  *
   9  * Cleanup and support for TMP431 and TMP432 by Guenter Roeck
  10  * Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
  11  */
  12
  13 /*
  14  * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
  15  *
  16  * Note this IC is in some aspect similar to the LM90, but it has quite a
  17  * few differences too, for example the local temp has a higher resolution
  18  * and thus has 16 bits registers for its value and limit instead of 8 bits.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/bitops.h>
  24 #include <linux/slab.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/i2c.h>
  27 #include <linux/hwmon.h>
  28 #include <linux/hwmon-sysfs.h>
  29 #include <linux/err.h>
  30 #include <linux/mutex.h>
  31 #include <linux/sysfs.h>
  32
  33 /* Addresses to scan */
  34 static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d,
  35         0x4e, 0x4f, I2C_CLIENT_END };
  36
  37 enum chips { tmp401, tmp411, tmp431, tmp432, tmp435, tmp461 };
  38
  39 /*
  40  * The TMP401 registers, note some registers have different addresses for
  41  * reading and writing
  42  */
  43 #define TMP401_STATUS                           0x02
  44 #define TMP401_CONFIG_READ                      0x03
  45 #define TMP401_CONFIG_WRITE                     0x09
  46 #define TMP401_CONVERSION_RATE_READ             0x04
  47 #define TMP401_CONVERSION_RATE_WRITE            0x0A
  48 #define TMP401_TEMP_CRIT_HYST                   0x21
  49 #define TMP401_MANUFACTURER_ID_REG              0xFE
  50 #define TMP401_DEVICE_ID_REG                    0xFF
  51
  52 static const u8 TMP401_TEMP_MSB_READ[7][2] = {
  53         { 0x00, 0x01 }, /* temp */
  54         { 0x06, 0x08 }, /* low limit */
  55         { 0x05, 0x07 }, /* high limit */
  56         { 0x20, 0x19 }, /* therm (crit) limit */
  57         { 0x30, 0x34 }, /* lowest */
  58         { 0x32, 0x36 }, /* highest */
  59         { 0, 0x11 },    /* offset */
  60 };
  61
  62 static const u8 TMP401_TEMP_MSB_WRITE[7][2] = {
  63         { 0, 0 },       /* temp (unused) */
  64         { 0x0C, 0x0E }, /* low limit */
  65         { 0x0B, 0x0D }, /* high limit */
  66         { 0x20, 0x19 }, /* therm (crit) limit */
  67         { 0x30, 0x34 }, /* lowest */
  68         { 0x32, 0x36 }, /* highest */
  69         { 0, 0x11 },    /* offset */
  70 };
  71
  72 static const u8 TMP432_TEMP_MSB_READ[4][3] = {
  73         { 0x00, 0x01, 0x23 },   /* temp */
  74         { 0x06, 0x08, 0x16 },   /* low limit */
  75         { 0x05, 0x07, 0x15 },   /* high limit */
  76         { 0x20, 0x19, 0x1A },   /* therm (crit) limit */
  77 };
  78
  79 static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
  80         { 0, 0, 0 },            /* temp  - unused */
  81         { 0x0C, 0x0E, 0x16 },   /* low limit */
  82         { 0x0B, 0x0D, 0x15 },   /* high limit */
  83         { 0x20, 0x19, 0x1A },   /* therm (crit) limit */
  84 };
  85
  86 /* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
  87 static const u8 TMP432_STATUS_REG[] = {
  88         0x1b, 0x36, 0x35, 0x37 };
  89
  90 /* Flags */
  91 #define TMP401_CONFIG_RANGE                     BIT(2)
  92 #define TMP401_CONFIG_SHUTDOWN                  BIT(6)
  93 #define TMP401_STATUS_LOCAL_CRIT                BIT(0)
  94 #define TMP401_STATUS_REMOTE_CRIT               BIT(1)
  95 #define TMP401_STATUS_REMOTE_OPEN               BIT(2)
  96 #define TMP401_STATUS_REMOTE_LOW                BIT(3)
  97 #define TMP401_STATUS_REMOTE_HIGH               BIT(4)
  98 #define TMP401_STATUS_LOCAL_LOW                 BIT(5)
  99 #define TMP401_STATUS_LOCAL_HIGH                BIT(6)
 100
 101 /* On TMP432, each status has its own register */
 102 #define TMP432_STATUS_LOCAL                     BIT(0)
 103 #define TMP432_STATUS_REMOTE1                   BIT(1)
 104 #define TMP432_STATUS_REMOTE2                   BIT(2)
 105
 106 /* Manufacturer / Device ID's */
 107 #define TMP401_MANUFACTURER_ID                  0x55
 108 #define TMP401_DEVICE_ID                        0x11
 109 #define TMP411A_DEVICE_ID                       0x12
 110 #define TMP411B_DEVICE_ID                       0x13
 111 #define TMP411C_DEVICE_ID                       0x10
 112 #define TMP431_DEVICE_ID                        0x31
 113 #define TMP432_DEVICE_ID                        0x32
 114 #define TMP435_DEVICE_ID                        0x35
 115
 116 /*
 117  * Driver data (common to all clients)
 118  */
 119
 120 static const struct i2c_device_id tmp401_id[] = {
 121         { "tmp401", tmp401 },
 122         { "tmp411", tmp411 },
 123         { "tmp431", tmp431 },
 124         { "tmp432", tmp432 },
 125         { "tmp435", tmp435 },
 126         { "tmp461", tmp461 },
 127         { }
 128 };
 129 MODULE_DEVICE_TABLE(i2c, tmp401_id);
 130
 131 /*
 132  * Client data (each client gets its own)
 133  */
 134
 135 struct tmp401_data {
 136         struct i2c_client *client;
 137         const struct attribute_group *groups[3];
 138         struct mutex update_lock;
 139         char valid; /* zero until following fields are valid */
 140         unsigned long last_updated; /* in jiffies */
 141         enum chips kind;
 142
 143         unsigned int update_interval;   /* in milliseconds */
 144
 145         /* register values */
 146         u8 status[4];
 147         u8 config;
 148         u16 temp[7][3];
 149         u8 temp_crit_hyst;
 150 };
 151
 152 /*
 153  * Sysfs attr show / store functions
 154  */
 155
 156 static int tmp401_register_to_temp(u16 reg, u8 config)
 157 {
 158         int temp = reg;
 159
 160         if (config & TMP401_CONFIG_RANGE)
 161                 temp -= 64 * 256;
 162
 163         return DIV_ROUND_CLOSEST(temp * 125, 32);
 164 }
 165
 166 static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
 167 {
 168         if (config & TMP401_CONFIG_RANGE) {
 169                 temp = clamp_val(temp, -64000, 191000);
 170                 temp += 64000;
 171         } else
 172                 temp = clamp_val(temp, 0, 127000);
 173
 174         return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
 175 }
 176
 177 static int tmp401_update_device_reg16(struct i2c_client *client,
 178                                       struct tmp401_data *data)
 179 {
 180         int i, j, val;
 181         int num_regs = data->kind == tmp411 ? 6 : 4;
 182         int num_sensors = data->kind == tmp432 ? 3 : 2;
 183
 184         for (i = 0; i < num_sensors; i++) {             /* local / r1 / r2 */
 185                 for (j = 0; j < num_regs; j++) {        /* temp / low / ... */
 186                         u8 regaddr;
 187
 188                         regaddr = data->kind == tmp432 ?
 189                                                 TMP432_TEMP_MSB_READ[j][i] :
 190                                                 TMP401_TEMP_MSB_READ[j][i];
 191                         if (j == 3) { /* crit is msb only */
 192                                 val = i2c_smbus_read_byte_data(client, regaddr);
 193                         } else {
 194                                 val = i2c_smbus_read_word_swapped(client,
 195                                                                   regaddr);
 196                         }
 197                         if (val < 0)
 198                                 return val;
 199
 200                         data->temp[j][i] = j == 3 ? val << 8 : val;
 201                 }
 202         }
 203         return 0;
 204 }
 205
 206 static struct tmp401_data *tmp401_update_device(struct device *dev)
 207 {
 208         struct tmp401_data *data = dev_get_drvdata(dev);
 209         struct i2c_client *client = data->client;
 210         struct tmp401_data *ret = data;
 211         int i, val;
 212         unsigned long next_update;
 213
 214         mutex_lock(&data->update_lock);
 215
 216         next_update = data->last_updated +
 217                       msecs_to_jiffies(data->update_interval);
 218         if (time_after(jiffies, next_update) || !data->valid) {
 219                 if (data->kind != tmp432) {
 220                         /*
 221                          * The driver uses the TMP432 status format internally.
 222                          * Convert status to TMP432 format for other chips.
 223                          */
 224                         val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
 225                         if (val < 0) {
 226                                 ret = ERR_PTR(val);
 227                                 goto abort;
 228                         }
 229                         data->status[0] =
 230                           (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
 231                         data->status[1] =
 232                           ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
 233                           ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
 234                         data->status[2] =
 235                           ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
 236                           ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
 237                         data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
 238                                                 | TMP401_STATUS_REMOTE_CRIT);
 239                 } else {
 240                         for (i = 0; i < ARRAY_SIZE(data->status); i++) {
 241                                 val = i2c_smbus_read_byte_data(client,
 242                                                         TMP432_STATUS_REG[i]);
 243                                 if (val < 0) {
 244                                         ret = ERR_PTR(val);
 245                                         goto abort;
 246                                 }
 247                                 data->status[i] = val;
 248                         }
 249                 }
 250
 251                 val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 252                 if (val < 0) {
 253                         ret = ERR_PTR(val);
 254                         goto abort;
 255                 }
 256                 data->config = val;
 257                 val = tmp401_update_device_reg16(client, data);
 258                 if (val < 0) {
 259                         ret = ERR_PTR(val);
 260                         goto abort;
 261                 }
 262                 val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
 263                 if (val < 0) {
 264                         ret = ERR_PTR(val);
 265                         goto abort;
 266                 }
 267                 data->temp_crit_hyst = val;
 268
 269                 data->last_updated = jiffies;
 270                 data->valid = 1;
 271         }
 272
 273 abort:
 274         mutex_unlock(&data->update_lock);
 275         return ret;
 276 }
 277
 278 static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
 279                          char *buf)
 280 {
 281         int nr = to_sensor_dev_attr_2(devattr)->nr;
 282         int index = to_sensor_dev_attr_2(devattr)->index;
 283         struct tmp401_data *data = tmp401_update_device(dev);
 284
 285         if (IS_ERR(data))
 286                 return PTR_ERR(data);
 287
 288         return sprintf(buf, "%d\n",
 289                 tmp401_register_to_temp(data->temp[nr][index], data->config));
 290 }
 291
 292 static ssize_t temp_crit_hyst_show(struct device *dev,
 293                                    struct device_attribute *devattr,
 294                                    char *buf)
 295 {
 296         int temp, index = to_sensor_dev_attr(devattr)->index;
 297         struct tmp401_data *data = tmp401_update_device(dev);
 298
 299         if (IS_ERR(data))
 300                 return PTR_ERR(data);
 301
 302         mutex_lock(&data->update_lock);
 303         temp = tmp401_register_to_temp(data->temp[3][index], data->config);
 304         temp -= data->temp_crit_hyst * 1000;
 305         mutex_unlock(&data->update_lock);
 306
 307         return sprintf(buf, "%d\n", temp);
 308 }
 309
 310 static ssize_t status_show(struct device *dev,
 311                            struct device_attribute *devattr, char *buf)
 312 {
 313         int nr = to_sensor_dev_attr_2(devattr)->nr;
 314         int mask = to_sensor_dev_attr_2(devattr)->index;
 315         struct tmp401_data *data = tmp401_update_device(dev);
 316
 317         if (IS_ERR(data))
 318                 return PTR_ERR(data);
 319
 320         return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
 321 }
 322
 323 static ssize_t temp_store(struct device *dev,
 324                           struct device_attribute *devattr, const char *buf,
 325                           size_t count)
 326 {
 327         int nr = to_sensor_dev_attr_2(devattr)->nr;
 328         int index = to_sensor_dev_attr_2(devattr)->index;
 329         struct tmp401_data *data = dev_get_drvdata(dev);
 330         struct i2c_client *client = data->client;
 331         long val;
 332         u16 reg;
 333         u8 regaddr;
 334
 335         if (kstrtol(buf, 10, &val))
 336                 return -EINVAL;
 337
 338         reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
 339
 340         mutex_lock(&data->update_lock);
 341
 342         regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
 343                                        : TMP401_TEMP_MSB_WRITE[nr][index];
 344         if (nr == 3) { /* crit is msb only */
 345                 i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
 346         } else {
 347                 /* Hardware expects big endian data --> use _swapped */
 348                 i2c_smbus_write_word_swapped(client, regaddr, reg);
 349         }
 350         data->temp[nr][index] = reg;
 351
 352         mutex_unlock(&data->update_lock);
 353
 354         return count;
 355 }
 356
 357 static ssize_t temp_crit_hyst_store(struct device *dev,
 358                                     struct device_attribute *devattr,
 359                                     const char *buf, size_t count)
 360 {
 361         int temp, index = to_sensor_dev_attr(devattr)->index;
 362         struct tmp401_data *data = tmp401_update_device(dev);
 363         long val;
 364         u8 reg;
 365
 366         if (IS_ERR(data))
 367                 return PTR_ERR(data);
 368
 369         if (kstrtol(buf, 10, &val))
 370                 return -EINVAL;
 371
 372         if (data->config & TMP401_CONFIG_RANGE)
 373                 val = clamp_val(val, -64000, 191000);
 374         else
 375                 val = clamp_val(val, 0, 127000);
 376
 377         mutex_lock(&data->update_lock);
 378         temp = tmp401_register_to_temp(data->temp[3][index], data->config);
 379         val = clamp_val(val, temp - 255000, temp);
 380         reg = ((temp - val) + 500) / 1000;
 381
 382         i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
 383                                   reg);
 384
 385         data->temp_crit_hyst = reg;
 386
 387         mutex_unlock(&data->update_lock);
 388
 389         return count;
 390 }
 391
 392 /*
 393  * Resets the historical measurements of minimum and maximum temperatures.
 394  * This is done by writing any value to any of the minimum/maximum registers
 395  * (0x30-0x37).
 396  */
 397 static ssize_t reset_temp_history_store(struct device *dev,
 398                                         struct device_attribute *devattr,
 399                                         const char *buf, size_t count)
 400 {
 401         struct tmp401_data *data = dev_get_drvdata(dev);
 402         struct i2c_client *client = data->client;
 403         long val;
 404
 405         if (kstrtol(buf, 10, &val))
 406                 return -EINVAL;
 407
 408         if (val != 1) {
 409                 dev_err(dev,
 410                         "temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
 411                         val);
 412                 return -EINVAL;
 413         }
 414         mutex_lock(&data->update_lock);
 415         i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
 416         data->valid = 0;
 417         mutex_unlock(&data->update_lock);
 418
 419         return count;
 420 }
 421
 422 static ssize_t update_interval_show(struct device *dev,
 423                                     struct device_attribute *attr, char *buf)
 424 {
 425         struct tmp401_data *data = dev_get_drvdata(dev);
 426
 427         return sprintf(buf, "%u\n", data->update_interval);
 428 }
 429
 430 static ssize_t update_interval_store(struct device *dev,
 431                                      struct device_attribute *attr,
 432                                      const char *buf, size_t count)
 433 {
 434         struct tmp401_data *data = dev_get_drvdata(dev);
 435         struct i2c_client *client = data->client;
 436         unsigned long val;
 437         int err, rate;
 438
 439         err = kstrtoul(buf, 10, &val);
 440         if (err)
 441                 return err;
 442
 443         /*
 444          * For valid rates, interval can be calculated as
 445          *      interval = (1 << (7 - rate)) * 125;
 446          * Rounded rate is therefore
 447          *      rate = 7 - __fls(interval * 4 / (125 * 3));
 448          * Use clamp_val() to avoid overflows, and to ensure valid input
 449          * for __fls.
 450          */
 451         val = clamp_val(val, 125, 16000);
 452         rate = 7 - __fls(val * 4 / (125 * 3));
 453         mutex_lock(&data->update_lock);
 454         i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
 455         data->update_interval = (1 << (7 - rate)) * 125;
 456         mutex_unlock(&data->update_lock);
 457
 458         return count;
 459 }
 460
 461 static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, 0);
 462 static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 1, 0);
 463 static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 2, 0);
 464 static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 3, 0);
 465 static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, temp_crit_hyst, 0);
 466 static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, status, 1,
 467                                TMP432_STATUS_LOCAL);
 468 static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, status, 2,
 469                                TMP432_STATUS_LOCAL);
 470 static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, status, 3,
 471                                TMP432_STATUS_LOCAL);
 472 static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 0, 1);
 473 static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 1, 1);
 474 static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 2, 1);
 475 static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 3, 1);
 476 static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, temp_crit_hyst, 1);
 477 static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, status, 0, TMP432_STATUS_REMOTE1);
 478 static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, status, 1,
 479                                TMP432_STATUS_REMOTE1);
 480 static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, status, 2,
 481                                TMP432_STATUS_REMOTE1);
 482 static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, status, 3,
 483                                TMP432_STATUS_REMOTE1);
 484
 485 static DEVICE_ATTR_RW(update_interval);
 486
 487 static struct attribute *tmp401_attributes[] = {
 488         &sensor_dev_attr_temp1_input.dev_attr.attr,
 489         &sensor_dev_attr_temp1_min.dev_attr.attr,
 490         &sensor_dev_attr_temp1_max.dev_attr.attr,
 491         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 492         &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
 493         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 494         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 495         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 496
 497         &sensor_dev_attr_temp2_input.dev_attr.attr,
 498         &sensor_dev_attr_temp2_min.dev_attr.attr,
 499         &sensor_dev_attr_temp2_max.dev_attr.attr,
 500         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 501         &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
 502         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 503         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 504         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 505         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 506
 507         &dev_attr_update_interval.attr,
 508
 509         NULL
 510 };
 511
 512 static const struct attribute_group tmp401_group = {
 513         .attrs = tmp401_attributes,
 514 };
 515
 516 /*
 517  * Additional features of the TMP411 chip.
 518  * The TMP411 stores the minimum and maximum
 519  * temperature measured since power-on, chip-reset, or
 520  * minimum and maximum register reset for both the local
 521  * and remote channels.
 522  */
 523 static SENSOR_DEVICE_ATTR_2_RO(temp1_lowest, temp, 4, 0);
 524 static SENSOR_DEVICE_ATTR_2_RO(temp1_highest, temp, 5, 0);
 525 static SENSOR_DEVICE_ATTR_2_RO(temp2_lowest, temp, 4, 1);
 526 static SENSOR_DEVICE_ATTR_2_RO(temp2_highest, temp, 5, 1);
 527 static SENSOR_DEVICE_ATTR_WO(temp_reset_history, reset_temp_history, 0);
 528
 529 static struct attribute *tmp411_attributes[] = {
 530         &sensor_dev_attr_temp1_highest.dev_attr.attr,
 531         &sensor_dev_attr_temp1_lowest.dev_attr.attr,
 532         &sensor_dev_attr_temp2_highest.dev_attr.attr,
 533         &sensor_dev_attr_temp2_lowest.dev_attr.attr,
 534         &sensor_dev_attr_temp_reset_history.dev_attr.attr,
 535         NULL
 536 };
 537
 538 static const struct attribute_group tmp411_group = {
 539         .attrs = tmp411_attributes,
 540 };
 541
 542 static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 0, 2);
 543 static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 1, 2);
 544 static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, 2);
 545 static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 3, 2);
 546 static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, temp_crit_hyst, 2);
 547 static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, status, 0, TMP432_STATUS_REMOTE2);
 548 static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, status, 1,
 549                                TMP432_STATUS_REMOTE2);
 550 static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, status, 2,
 551                                TMP432_STATUS_REMOTE2);
 552 static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, status, 3,
 553                                TMP432_STATUS_REMOTE2);
 554
 555 static struct attribute *tmp432_attributes[] = {
 556         &sensor_dev_attr_temp3_input.dev_attr.attr,
 557         &sensor_dev_attr_temp3_min.dev_attr.attr,
 558         &sensor_dev_attr_temp3_max.dev_attr.attr,
 559         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 560         &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
 561         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 562         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 563         &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
 564         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 565
 566         NULL
 567 };
 568
 569 static const struct attribute_group tmp432_group = {
 570         .attrs = tmp432_attributes,
 571 };
 572
 573 /*
 574  * Additional features of the TMP461 chip.
 575  * The TMP461 temperature offset for the remote channel.
 576  */
 577 static SENSOR_DEVICE_ATTR_2_RW(temp2_offset, temp, 6, 1);
 578
 579 static struct attribute *tmp461_attributes[] = {
 580         &sensor_dev_attr_temp2_offset.dev_attr.attr,
 581         NULL
 582 };
 583
 584 static const struct attribute_group tmp461_group = {
 585         .attrs = tmp461_attributes,
 586 };
 587
 588 /*
 589  * Begin non sysfs callback code (aka Real code)
 590  */
 591
 592 static int tmp401_init_client(struct tmp401_data *data,
 593                               struct i2c_client *client)
 594 {
 595         int config, config_orig, status = 0;
 596
 597         /* Set the conversion rate to 2 Hz */
 598         i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
 599         data->update_interval = 500;
 600
 601         /* Start conversions (disable shutdown if necessary) */
 602         config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 603         if (config < 0)
 604                 return config;
 605
 606         config_orig = config;
 607         config &= ~TMP401_CONFIG_SHUTDOWN;
 608
 609         if (config != config_orig)
 610                 status = i2c_smbus_write_byte_data(client,
 611                                                    TMP401_CONFIG_WRITE,
 612                                                    config);
 613
 614         return status;
 615 }
 616
 617 static int tmp401_detect(struct i2c_client *client,
 618                          struct i2c_board_info *info)
 619 {
 620         enum chips kind;
 621         struct i2c_adapter *adapter = client->adapter;
 622         u8 reg;
 623
 624         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 625                 return -ENODEV;
 626
 627         /* Detect and identify the chip */
 628         reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
 629         if (reg != TMP401_MANUFACTURER_ID)
 630                 return -ENODEV;
 631
 632         reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
 633
 634         switch (reg) {
 635         case TMP401_DEVICE_ID:
 636                 if (client->addr != 0x4c)
 637                         return -ENODEV;
 638                 kind = tmp401;
 639                 break;
 640         case TMP411A_DEVICE_ID:
 641                 if (client->addr != 0x4c)
 642                         return -ENODEV;
 643                 kind = tmp411;
 644                 break;
 645         case TMP411B_DEVICE_ID:
 646                 if (client->addr != 0x4d)
 647                         return -ENODEV;
 648                 kind = tmp411;
 649                 break;
 650         case TMP411C_DEVICE_ID:
 651                 if (client->addr != 0x4e)
 652                         return -ENODEV;
 653                 kind = tmp411;
 654                 break;
 655         case TMP431_DEVICE_ID:
 656                 if (client->addr != 0x4c && client->addr != 0x4d)
 657                         return -ENODEV;
 658                 kind = tmp431;
 659                 break;
 660         case TMP432_DEVICE_ID:
 661                 if (client->addr != 0x4c && client->addr != 0x4d)
 662                         return -ENODEV;
 663                 kind = tmp432;
 664                 break;
 665         case TMP435_DEVICE_ID:
 666                 kind = tmp435;
 667                 break;
 668         default:
 669                 return -ENODEV;
 670         }
 671
 672         reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 673         if (reg & 0x1b)
 674                 return -ENODEV;
 675
 676         reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
 677         /* Datasheet says: 0x1-0x6 */
 678         if (reg > 15)
 679                 return -ENODEV;
 680
 681         strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
 682
 683         return 0;
 684 }
 685
 686 static int tmp401_probe(struct i2c_client *client,
 687                         const struct i2c_device_id *id)
 688 {
 689         static const char * const names[] = {
 690                 "TMP401", "TMP411", "TMP431", "TMP432", "TMP435", "TMP461"
 691         };
 692         struct device *dev = &client->dev;
 693         struct device *hwmon_dev;
 694         struct tmp401_data *data;
 695         int groups = 0, status;
 696
 697         data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
 698         if (!data)
 699                 return -ENOMEM;
 700
 701         data->client = client;
 702         mutex_init(&data->update_lock);
 703         data->kind = id->driver_data;
 704
 705         /* Initialize the TMP401 chip */
 706         status = tmp401_init_client(data, client);
 707         if (status < 0)
 708                 return status;
 709
 710         /* Register sysfs hooks */
 711         data->groups[groups++] = &tmp401_group;
 712
 713         /* Register additional tmp411 sysfs hooks */
 714         if (data->kind == tmp411)
 715                 data->groups[groups++] = &tmp411_group;
 716
 717         /* Register additional tmp432 sysfs hooks */
 718         if (data->kind == tmp432)
 719                 data->groups[groups++] = &tmp432_group;
 720
 721         if (data->kind == tmp461)
 722                 data->groups[groups++] = &tmp461_group;
 723
 724         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 725                                                            data, data->groups);
 726         if (IS_ERR(hwmon_dev))
 727                 return PTR_ERR(hwmon_dev);
 728
 729         dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
 730
 731         return 0;
 732 }
 733
 734 static struct i2c_driver tmp401_driver = {
 735         .class          = I2C_CLASS_HWMON,
 736         .driver = {
 737                 .name   = "tmp401",
 738         },
 739         .probe          = tmp401_probe,
 740         .id_table       = tmp401_id,
 741         .detect         = tmp401_detect,
 742         .address_list   = normal_i2c,
 743 };
 744
 745 module_i2c_driver(tmp401_driver);
 746
 747 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 748 MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
 749 MODULE_LICENSE("GPL");