linux/drivers/hwmon/tmp401.c
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   1/* tmp401.c
   2 *
   3 * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>
   4 * Preliminary tmp411 support by:
   5 * Gabriel Konat, Sander Leget, Wouter Willems
   6 * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23/*
  24 * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
  25 *
  26 * Note this IC is in some aspect similar to the LM90, but it has quite a
  27 * few differences too, for example the local temp has a higher resolution
  28 * and thus has 16 bits registers for its value and limit instead of 8 bits.
  29 */
  30
  31#include <linux/module.h>
  32#include <linux/init.h>
  33#include <linux/slab.h>
  34#include <linux/jiffies.h>
  35#include <linux/i2c.h>
  36#include <linux/hwmon.h>
  37#include <linux/hwmon-sysfs.h>
  38#include <linux/err.h>
  39#include <linux/mutex.h>
  40#include <linux/sysfs.h>
  41
  42/* Addresses to scan */
  43static const unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END };
  44
  45enum chips { tmp401, tmp411 };
  46
  47/*
  48 * The TMP401 registers, note some registers have different addresses for
  49 * reading and writing
  50 */
  51#define TMP401_STATUS                           0x02
  52#define TMP401_CONFIG_READ                      0x03
  53#define TMP401_CONFIG_WRITE                     0x09
  54#define TMP401_CONVERSION_RATE_READ             0x04
  55#define TMP401_CONVERSION_RATE_WRITE            0x0A
  56#define TMP401_TEMP_CRIT_HYST                   0x21
  57#define TMP401_CONSECUTIVE_ALERT                0x22
  58#define TMP401_MANUFACTURER_ID_REG              0xFE
  59#define TMP401_DEVICE_ID_REG                    0xFF
  60#define TMP411_N_FACTOR_REG                     0x18
  61
  62static const u8 TMP401_TEMP_MSB[2]                      = { 0x00, 0x01 };
  63static const u8 TMP401_TEMP_LSB[2]                      = { 0x15, 0x10 };
  64static const u8 TMP401_TEMP_LOW_LIMIT_MSB_READ[2]       = { 0x06, 0x08 };
  65static const u8 TMP401_TEMP_LOW_LIMIT_MSB_WRITE[2]      = { 0x0C, 0x0E };
  66static const u8 TMP401_TEMP_LOW_LIMIT_LSB[2]            = { 0x17, 0x14 };
  67static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_READ[2]      = { 0x05, 0x07 };
  68static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[2]     = { 0x0B, 0x0D };
  69static const u8 TMP401_TEMP_HIGH_LIMIT_LSB[2]           = { 0x16, 0x13 };
  70/* These are called the THERM limit / hysteresis / mask in the datasheet */
  71static const u8 TMP401_TEMP_CRIT_LIMIT[2]               = { 0x20, 0x19 };
  72
  73static const u8 TMP411_TEMP_LOWEST_MSB[2]               = { 0x30, 0x34 };
  74static const u8 TMP411_TEMP_LOWEST_LSB[2]               = { 0x31, 0x35 };
  75static const u8 TMP411_TEMP_HIGHEST_MSB[2]              = { 0x32, 0x36 };
  76static const u8 TMP411_TEMP_HIGHEST_LSB[2]              = { 0x33, 0x37 };
  77
  78/* Flags */
  79#define TMP401_CONFIG_RANGE             0x04
  80#define TMP401_CONFIG_SHUTDOWN          0x40
  81#define TMP401_STATUS_LOCAL_CRIT                0x01
  82#define TMP401_STATUS_REMOTE_CRIT               0x02
  83#define TMP401_STATUS_REMOTE_OPEN               0x04
  84#define TMP401_STATUS_REMOTE_LOW                0x08
  85#define TMP401_STATUS_REMOTE_HIGH               0x10
  86#define TMP401_STATUS_LOCAL_LOW         0x20
  87#define TMP401_STATUS_LOCAL_HIGH                0x40
  88
  89/* Manufacturer / Device ID's */
  90#define TMP401_MANUFACTURER_ID                  0x55
  91#define TMP401_DEVICE_ID                        0x11
  92#define TMP411_DEVICE_ID                        0x12
  93
  94/*
  95 * Driver data (common to all clients)
  96 */
  97
  98static const struct i2c_device_id tmp401_id[] = {
  99        { "tmp401", tmp401 },
 100        { "tmp411", tmp411 },
 101        { }
 102};
 103MODULE_DEVICE_TABLE(i2c, tmp401_id);
 104
 105/*
 106 * Client data (each client gets its own)
 107 */
 108
 109struct tmp401_data {
 110        struct device *hwmon_dev;
 111        struct mutex update_lock;
 112        char valid; /* zero until following fields are valid */
 113        unsigned long last_updated; /* in jiffies */
 114        enum chips kind;
 115
 116        /* register values */
 117        u8 status;
 118        u8 config;
 119        u16 temp[2];
 120        u16 temp_low[2];
 121        u16 temp_high[2];
 122        u8 temp_crit[2];
 123        u8 temp_crit_hyst;
 124        u16 temp_lowest[2];
 125        u16 temp_highest[2];
 126};
 127
 128/*
 129 * Sysfs attr show / store functions
 130 */
 131
 132static int tmp401_register_to_temp(u16 reg, u8 config)
 133{
 134        int temp = reg;
 135
 136        if (config & TMP401_CONFIG_RANGE)
 137                temp -= 64 * 256;
 138
 139        return (temp * 625 + 80) / 160;
 140}
 141
 142static u16 tmp401_temp_to_register(long temp, u8 config)
 143{
 144        if (config & TMP401_CONFIG_RANGE) {
 145                temp = SENSORS_LIMIT(temp, -64000, 191000);
 146                temp += 64000;
 147        } else
 148                temp = SENSORS_LIMIT(temp, 0, 127000);
 149
 150        return (temp * 160 + 312) / 625;
 151}
 152
 153static int tmp401_crit_register_to_temp(u8 reg, u8 config)
 154{
 155        int temp = reg;
 156
 157        if (config & TMP401_CONFIG_RANGE)
 158                temp -= 64;
 159
 160        return temp * 1000;
 161}
 162
 163static u8 tmp401_crit_temp_to_register(long temp, u8 config)
 164{
 165        if (config & TMP401_CONFIG_RANGE) {
 166                temp = SENSORS_LIMIT(temp, -64000, 191000);
 167                temp += 64000;
 168        } else
 169                temp = SENSORS_LIMIT(temp, 0, 127000);
 170
 171        return (temp + 500) / 1000;
 172}
 173
 174static struct tmp401_data *tmp401_update_device_reg16(
 175        struct i2c_client *client, struct tmp401_data *data)
 176{
 177        int i;
 178
 179        for (i = 0; i < 2; i++) {
 180                /*
 181                 * High byte must be read first immediately followed
 182                 * by the low byte
 183                 */
 184                data->temp[i] = i2c_smbus_read_byte_data(client,
 185                        TMP401_TEMP_MSB[i]) << 8;
 186                data->temp[i] |= i2c_smbus_read_byte_data(client,
 187                        TMP401_TEMP_LSB[i]);
 188                data->temp_low[i] = i2c_smbus_read_byte_data(client,
 189                        TMP401_TEMP_LOW_LIMIT_MSB_READ[i]) << 8;
 190                data->temp_low[i] |= i2c_smbus_read_byte_data(client,
 191                        TMP401_TEMP_LOW_LIMIT_LSB[i]);
 192                data->temp_high[i] = i2c_smbus_read_byte_data(client,
 193                        TMP401_TEMP_HIGH_LIMIT_MSB_READ[i]) << 8;
 194                data->temp_high[i] |= i2c_smbus_read_byte_data(client,
 195                        TMP401_TEMP_HIGH_LIMIT_LSB[i]);
 196                data->temp_crit[i] = i2c_smbus_read_byte_data(client,
 197                        TMP401_TEMP_CRIT_LIMIT[i]);
 198
 199                if (data->kind == tmp411) {
 200                        data->temp_lowest[i] = i2c_smbus_read_byte_data(client,
 201                                TMP411_TEMP_LOWEST_MSB[i]) << 8;
 202                        data->temp_lowest[i] |= i2c_smbus_read_byte_data(
 203                                client, TMP411_TEMP_LOWEST_LSB[i]);
 204
 205                        data->temp_highest[i] = i2c_smbus_read_byte_data(
 206                                client, TMP411_TEMP_HIGHEST_MSB[i]) << 8;
 207                        data->temp_highest[i] |= i2c_smbus_read_byte_data(
 208                                client, TMP411_TEMP_HIGHEST_LSB[i]);
 209                }
 210        }
 211        return data;
 212}
 213
 214static struct tmp401_data *tmp401_update_device(struct device *dev)
 215{
 216        struct i2c_client *client = to_i2c_client(dev);
 217        struct tmp401_data *data = i2c_get_clientdata(client);
 218
 219        mutex_lock(&data->update_lock);
 220
 221        if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 222                data->status = i2c_smbus_read_byte_data(client, TMP401_STATUS);
 223                data->config = i2c_smbus_read_byte_data(client,
 224                                                TMP401_CONFIG_READ);
 225                tmp401_update_device_reg16(client, data);
 226
 227                data->temp_crit_hyst = i2c_smbus_read_byte_data(client,
 228                                                TMP401_TEMP_CRIT_HYST);
 229
 230                data->last_updated = jiffies;
 231                data->valid = 1;
 232        }
 233
 234        mutex_unlock(&data->update_lock);
 235
 236        return data;
 237}
 238
 239static ssize_t show_temp_value(struct device *dev,
 240        struct device_attribute *devattr, char *buf)
 241{
 242        int index = to_sensor_dev_attr(devattr)->index;
 243        struct tmp401_data *data = tmp401_update_device(dev);
 244
 245        return sprintf(buf, "%d\n",
 246                tmp401_register_to_temp(data->temp[index], data->config));
 247}
 248
 249static ssize_t show_temp_min(struct device *dev,
 250        struct device_attribute *devattr, char *buf)
 251{
 252        int index = to_sensor_dev_attr(devattr)->index;
 253        struct tmp401_data *data = tmp401_update_device(dev);
 254
 255        return sprintf(buf, "%d\n",
 256                tmp401_register_to_temp(data->temp_low[index], data->config));
 257}
 258
 259static ssize_t show_temp_max(struct device *dev,
 260        struct device_attribute *devattr, char *buf)
 261{
 262        int index = to_sensor_dev_attr(devattr)->index;
 263        struct tmp401_data *data = tmp401_update_device(dev);
 264
 265        return sprintf(buf, "%d\n",
 266                tmp401_register_to_temp(data->temp_high[index], data->config));
 267}
 268
 269static ssize_t show_temp_crit(struct device *dev,
 270        struct device_attribute *devattr, char *buf)
 271{
 272        int index = to_sensor_dev_attr(devattr)->index;
 273        struct tmp401_data *data = tmp401_update_device(dev);
 274
 275        return sprintf(buf, "%d\n",
 276                        tmp401_crit_register_to_temp(data->temp_crit[index],
 277                                                        data->config));
 278}
 279
 280static ssize_t show_temp_crit_hyst(struct device *dev,
 281        struct device_attribute *devattr, char *buf)
 282{
 283        int temp, index = to_sensor_dev_attr(devattr)->index;
 284        struct tmp401_data *data = tmp401_update_device(dev);
 285
 286        mutex_lock(&data->update_lock);
 287        temp = tmp401_crit_register_to_temp(data->temp_crit[index],
 288                                                data->config);
 289        temp -= data->temp_crit_hyst * 1000;
 290        mutex_unlock(&data->update_lock);
 291
 292        return sprintf(buf, "%d\n", temp);
 293}
 294
 295static ssize_t show_temp_lowest(struct device *dev,
 296        struct device_attribute *devattr, char *buf)
 297{
 298        int index = to_sensor_dev_attr(devattr)->index;
 299        struct tmp401_data *data = tmp401_update_device(dev);
 300
 301        return sprintf(buf, "%d\n",
 302                tmp401_register_to_temp(data->temp_lowest[index],
 303                                        data->config));
 304}
 305
 306static ssize_t show_temp_highest(struct device *dev,
 307        struct device_attribute *devattr, char *buf)
 308{
 309        int index = to_sensor_dev_attr(devattr)->index;
 310        struct tmp401_data *data = tmp401_update_device(dev);
 311
 312        return sprintf(buf, "%d\n",
 313                tmp401_register_to_temp(data->temp_highest[index],
 314                                        data->config));
 315}
 316
 317static ssize_t show_status(struct device *dev,
 318        struct device_attribute *devattr, char *buf)
 319{
 320        int mask = to_sensor_dev_attr(devattr)->index;
 321        struct tmp401_data *data = tmp401_update_device(dev);
 322
 323        if (data->status & mask)
 324                return sprintf(buf, "1\n");
 325        else
 326                return sprintf(buf, "0\n");
 327}
 328
 329static ssize_t store_temp_min(struct device *dev, struct device_attribute
 330        *devattr, const char *buf, size_t count)
 331{
 332        int index = to_sensor_dev_attr(devattr)->index;
 333        struct tmp401_data *data = tmp401_update_device(dev);
 334        long val;
 335        u16 reg;
 336
 337        if (kstrtol(buf, 10, &val))
 338                return -EINVAL;
 339
 340        reg = tmp401_temp_to_register(val, data->config);
 341
 342        mutex_lock(&data->update_lock);
 343
 344        i2c_smbus_write_byte_data(to_i2c_client(dev),
 345                TMP401_TEMP_LOW_LIMIT_MSB_WRITE[index], reg >> 8);
 346        i2c_smbus_write_byte_data(to_i2c_client(dev),
 347                TMP401_TEMP_LOW_LIMIT_LSB[index], reg & 0xFF);
 348
 349        data->temp_low[index] = reg;
 350
 351        mutex_unlock(&data->update_lock);
 352
 353        return count;
 354}
 355
 356static ssize_t store_temp_max(struct device *dev, struct device_attribute
 357        *devattr, const char *buf, size_t count)
 358{
 359        int index = to_sensor_dev_attr(devattr)->index;
 360        struct tmp401_data *data = tmp401_update_device(dev);
 361        long val;
 362        u16 reg;
 363
 364        if (kstrtol(buf, 10, &val))
 365                return -EINVAL;
 366
 367        reg = tmp401_temp_to_register(val, data->config);
 368
 369        mutex_lock(&data->update_lock);
 370
 371        i2c_smbus_write_byte_data(to_i2c_client(dev),
 372                TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[index], reg >> 8);
 373        i2c_smbus_write_byte_data(to_i2c_client(dev),
 374                TMP401_TEMP_HIGH_LIMIT_LSB[index], reg & 0xFF);
 375
 376        data->temp_high[index] = reg;
 377
 378        mutex_unlock(&data->update_lock);
 379
 380        return count;
 381}
 382
 383static ssize_t store_temp_crit(struct device *dev, struct device_attribute
 384        *devattr, const char *buf, size_t count)
 385{
 386        int index = to_sensor_dev_attr(devattr)->index;
 387        struct tmp401_data *data = tmp401_update_device(dev);
 388        long val;
 389        u8 reg;
 390
 391        if (kstrtol(buf, 10, &val))
 392                return -EINVAL;
 393
 394        reg = tmp401_crit_temp_to_register(val, data->config);
 395
 396        mutex_lock(&data->update_lock);
 397
 398        i2c_smbus_write_byte_data(to_i2c_client(dev),
 399                TMP401_TEMP_CRIT_LIMIT[index], reg);
 400
 401        data->temp_crit[index] = reg;
 402
 403        mutex_unlock(&data->update_lock);
 404
 405        return count;
 406}
 407
 408static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
 409        *devattr, const char *buf, size_t count)
 410{
 411        int temp, index = to_sensor_dev_attr(devattr)->index;
 412        struct tmp401_data *data = tmp401_update_device(dev);
 413        long val;
 414        u8 reg;
 415
 416        if (kstrtol(buf, 10, &val))
 417                return -EINVAL;
 418
 419        if (data->config & TMP401_CONFIG_RANGE)
 420                val = SENSORS_LIMIT(val, -64000, 191000);
 421        else
 422                val = SENSORS_LIMIT(val, 0, 127000);
 423
 424        mutex_lock(&data->update_lock);
 425        temp = tmp401_crit_register_to_temp(data->temp_crit[index],
 426                                                data->config);
 427        val = SENSORS_LIMIT(val, temp - 255000, temp);
 428        reg = ((temp - val) + 500) / 1000;
 429
 430        i2c_smbus_write_byte_data(to_i2c_client(dev),
 431                TMP401_TEMP_CRIT_HYST, reg);
 432
 433        data->temp_crit_hyst = reg;
 434
 435        mutex_unlock(&data->update_lock);
 436
 437        return count;
 438}
 439
 440/*
 441 * Resets the historical measurements of minimum and maximum temperatures.
 442 * This is done by writing any value to any of the minimum/maximum registers
 443 * (0x30-0x37).
 444 */
 445static ssize_t reset_temp_history(struct device *dev,
 446        struct device_attribute *devattr, const char *buf, size_t count)
 447{
 448        long val;
 449
 450        if (kstrtol(buf, 10, &val))
 451                return -EINVAL;
 452
 453        if (val != 1) {
 454                dev_err(dev, "temp_reset_history value %ld not"
 455                        " supported. Use 1 to reset the history!\n", val);
 456                return -EINVAL;
 457        }
 458        i2c_smbus_write_byte_data(to_i2c_client(dev),
 459                TMP411_TEMP_LOWEST_MSB[0], val);
 460
 461        return count;
 462}
 463
 464static struct sensor_device_attribute tmp401_attr[] = {
 465        SENSOR_ATTR(temp1_input, S_IRUGO, show_temp_value, NULL, 0),
 466        SENSOR_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
 467                    store_temp_min, 0),
 468        SENSOR_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
 469                    store_temp_max, 0),
 470        SENSOR_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit,
 471                    store_temp_crit, 0),
 472        SENSOR_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_crit_hyst,
 473                    store_temp_crit_hyst, 0),
 474        SENSOR_ATTR(temp1_min_alarm, S_IRUGO, show_status, NULL,
 475                    TMP401_STATUS_LOCAL_LOW),
 476        SENSOR_ATTR(temp1_max_alarm, S_IRUGO, show_status, NULL,
 477                    TMP401_STATUS_LOCAL_HIGH),
 478        SENSOR_ATTR(temp1_crit_alarm, S_IRUGO, show_status, NULL,
 479                    TMP401_STATUS_LOCAL_CRIT),
 480        SENSOR_ATTR(temp2_input, S_IRUGO, show_temp_value, NULL, 1),
 481        SENSOR_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
 482                    store_temp_min, 1),
 483        SENSOR_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
 484                    store_temp_max, 1),
 485        SENSOR_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit,
 486                    store_temp_crit, 1),
 487        SENSOR_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst, NULL, 1),
 488        SENSOR_ATTR(temp2_fault, S_IRUGO, show_status, NULL,
 489                    TMP401_STATUS_REMOTE_OPEN),
 490        SENSOR_ATTR(temp2_min_alarm, S_IRUGO, show_status, NULL,
 491                    TMP401_STATUS_REMOTE_LOW),
 492        SENSOR_ATTR(temp2_max_alarm, S_IRUGO, show_status, NULL,
 493                    TMP401_STATUS_REMOTE_HIGH),
 494        SENSOR_ATTR(temp2_crit_alarm, S_IRUGO, show_status, NULL,
 495                    TMP401_STATUS_REMOTE_CRIT),
 496};
 497
 498/*
 499 * Additional features of the TMP411 chip.
 500 * The TMP411 stores the minimum and maximum
 501 * temperature measured since power-on, chip-reset, or
 502 * minimum and maximum register reset for both the local
 503 * and remote channels.
 504 */
 505static struct sensor_device_attribute tmp411_attr[] = {
 506        SENSOR_ATTR(temp1_highest, S_IRUGO, show_temp_highest, NULL, 0),
 507        SENSOR_ATTR(temp1_lowest, S_IRUGO, show_temp_lowest, NULL, 0),
 508        SENSOR_ATTR(temp2_highest, S_IRUGO, show_temp_highest, NULL, 1),
 509        SENSOR_ATTR(temp2_lowest, S_IRUGO, show_temp_lowest, NULL, 1),
 510        SENSOR_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history, 0),
 511};
 512
 513/*
 514 * Begin non sysfs callback code (aka Real code)
 515 */
 516
 517static void tmp401_init_client(struct i2c_client *client)
 518{
 519        int config, config_orig;
 520
 521        /* Set the conversion rate to 2 Hz */
 522        i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
 523
 524        /* Start conversions (disable shutdown if necessary) */
 525        config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 526        if (config < 0) {
 527                dev_warn(&client->dev, "Initialization failed!\n");
 528                return;
 529        }
 530
 531        config_orig = config;
 532        config &= ~TMP401_CONFIG_SHUTDOWN;
 533
 534        if (config != config_orig)
 535                i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config);
 536}
 537
 538static int tmp401_detect(struct i2c_client *client,
 539                         struct i2c_board_info *info)
 540{
 541        enum chips kind;
 542        struct i2c_adapter *adapter = client->adapter;
 543        u8 reg;
 544
 545        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 546                return -ENODEV;
 547
 548        /* Detect and identify the chip */
 549        reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
 550        if (reg != TMP401_MANUFACTURER_ID)
 551                return -ENODEV;
 552
 553        reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
 554
 555        switch (reg) {
 556        case TMP401_DEVICE_ID:
 557                kind = tmp401;
 558                break;
 559        case TMP411_DEVICE_ID:
 560                kind = tmp411;
 561                break;
 562        default:
 563                return -ENODEV;
 564        }
 565
 566        reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 567        if (reg & 0x1b)
 568                return -ENODEV;
 569
 570        reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
 571        /* Datasheet says: 0x1-0x6 */
 572        if (reg > 15)
 573                return -ENODEV;
 574
 575        strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
 576
 577        return 0;
 578}
 579
 580static int tmp401_remove(struct i2c_client *client)
 581{
 582        struct tmp401_data *data = i2c_get_clientdata(client);
 583        int i;
 584
 585        if (data->hwmon_dev)
 586                hwmon_device_unregister(data->hwmon_dev);
 587
 588        for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++)
 589                device_remove_file(&client->dev, &tmp401_attr[i].dev_attr);
 590
 591        if (data->kind == tmp411) {
 592                for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++)
 593                        device_remove_file(&client->dev,
 594                                           &tmp411_attr[i].dev_attr);
 595        }
 596
 597        return 0;
 598}
 599
 600static int tmp401_probe(struct i2c_client *client,
 601                        const struct i2c_device_id *id)
 602{
 603        int i, err = 0;
 604        struct tmp401_data *data;
 605        const char *names[] = { "TMP401", "TMP411" };
 606
 607        data = devm_kzalloc(&client->dev, sizeof(struct tmp401_data),
 608                            GFP_KERNEL);
 609        if (!data)
 610                return -ENOMEM;
 611
 612        i2c_set_clientdata(client, data);
 613        mutex_init(&data->update_lock);
 614        data->kind = id->driver_data;
 615
 616        /* Initialize the TMP401 chip */
 617        tmp401_init_client(client);
 618
 619        /* Register sysfs hooks */
 620        for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++) {
 621                err = device_create_file(&client->dev,
 622                                         &tmp401_attr[i].dev_attr);
 623                if (err)
 624                        goto exit_remove;
 625        }
 626
 627        /* Register additional tmp411 sysfs hooks */
 628        if (data->kind == tmp411) {
 629                for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++) {
 630                        err = device_create_file(&client->dev,
 631                                                 &tmp411_attr[i].dev_attr);
 632                        if (err)
 633                                goto exit_remove;
 634                }
 635        }
 636
 637        data->hwmon_dev = hwmon_device_register(&client->dev);
 638        if (IS_ERR(data->hwmon_dev)) {
 639                err = PTR_ERR(data->hwmon_dev);
 640                data->hwmon_dev = NULL;
 641                goto exit_remove;
 642        }
 643
 644        dev_info(&client->dev, "Detected TI %s chip\n", names[data->kind]);
 645
 646        return 0;
 647
 648exit_remove:
 649        tmp401_remove(client);
 650        return err;
 651}
 652
 653static struct i2c_driver tmp401_driver = {
 654        .class          = I2C_CLASS_HWMON,
 655        .driver = {
 656                .name   = "tmp401",
 657        },
 658        .probe          = tmp401_probe,
 659        .remove         = tmp401_remove,
 660        .id_table       = tmp401_id,
 661        .detect         = tmp401_detect,
 662        .address_list   = normal_i2c,
 663};
 664
 665module_i2c_driver(tmp401_driver);
 666
 667MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 668MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
 669MODULE_LICENSE("GPL");
 670
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