drivers/hwmon/tmp401.c

   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  * Cleanup and support for TMP431 and TMP432 by Guenter Roeck
   9  * Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 /*
  27  * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
  28  *
  29  * Note this IC is in some aspect similar to the LM90, but it has quite a
  30  * few differences too, for example the local temp has a higher resolution
  31  * and thus has 16 bits registers for its value and limit instead of 8 bits.
  32  */
  33
  34 #include <linux/module.h>
  35 #include <linux/init.h>
  36 #include <linux/bitops.h>
  37 #include <linux/slab.h>
  38 #include <linux/jiffies.h>
  39 #include <linux/i2c.h>
  40 #include <linux/hwmon.h>
  41 #include <linux/hwmon-sysfs.h>
  42 #include <linux/err.h>
  43 #include <linux/mutex.h>
  44 #include <linux/sysfs.h>
  45
  46 /* Addresses to scan */
  47 static const unsigned short normal_i2c[] = { 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
  48
  49 enum chips { tmp401, tmp411, tmp431, tmp432 };
  50
  51 /*
  52  * The TMP401 registers, note some registers have different addresses for
  53  * reading and writing
  54  */
  55 #define TMP401_STATUS                           0x02
  56 #define TMP401_CONFIG_READ                      0x03
  57 #define TMP401_CONFIG_WRITE                     0x09
  58 #define TMP401_CONVERSION_RATE_READ             0x04
  59 #define TMP401_CONVERSION_RATE_WRITE            0x0A
  60 #define TMP401_TEMP_CRIT_HYST                   0x21
  61 #define TMP401_MANUFACTURER_ID_REG              0xFE
  62 #define TMP401_DEVICE_ID_REG                    0xFF
  63
  64 static const u8 TMP401_TEMP_MSB_READ[6][2] = {
  65         { 0x00, 0x01 }, /* temp */
  66         { 0x06, 0x08 }, /* low limit */
  67         { 0x05, 0x07 }, /* high limit */
  68         { 0x20, 0x19 }, /* therm (crit) limit */
  69         { 0x30, 0x34 }, /* lowest */
  70         { 0x32, 0x36 }, /* highest */
  71 };
  72
  73 static const u8 TMP401_TEMP_MSB_WRITE[6][2] = {
  74         { 0, 0 },       /* temp (unused) */
  75         { 0x0C, 0x0E }, /* low limit */
  76         { 0x0B, 0x0D }, /* high limit */
  77         { 0x20, 0x19 }, /* therm (crit) limit */
  78         { 0x30, 0x34 }, /* lowest */
  79         { 0x32, 0x36 }, /* highest */
  80 };
  81
  82 static const u8 TMP401_TEMP_LSB[6][2] = {
  83         { 0x15, 0x10 }, /* temp */
  84         { 0x17, 0x14 }, /* low limit */
  85         { 0x16, 0x13 }, /* high limit */
  86         { 0, 0 },       /* therm (crit) limit (unused) */
  87         { 0x31, 0x35 }, /* lowest */
  88         { 0x33, 0x37 }, /* highest */
  89 };
  90
  91 static const u8 TMP432_TEMP_MSB_READ[4][3] = {
  92         { 0x00, 0x01, 0x23 },   /* temp */
  93         { 0x06, 0x08, 0x16 },   /* low limit */
  94         { 0x05, 0x07, 0x15 },   /* high limit */
  95         { 0x20, 0x19, 0x1A },   /* therm (crit) limit */
  96 };
  97
  98 static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
  99         { 0, 0, 0 },            /* temp  - unused */
 100         { 0x0C, 0x0E, 0x16 },   /* low limit */
 101         { 0x0B, 0x0D, 0x15 },   /* high limit */
 102         { 0x20, 0x19, 0x1A },   /* therm (crit) limit */
 103 };
 104
 105 static const u8 TMP432_TEMP_LSB[3][3] = {
 106         { 0x29, 0x10, 0x24 },   /* temp */
 107         { 0x3E, 0x14, 0x18 },   /* low limit */
 108         { 0x3D, 0x13, 0x17 },   /* high limit */
 109 };
 110
 111 /* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
 112 static const u8 TMP432_STATUS_REG[] = {
 113         0x1b, 0x36, 0x35, 0x37 };
 114
 115 /* Flags */
 116 #define TMP401_CONFIG_RANGE                     BIT(2)
 117 #define TMP401_CONFIG_SHUTDOWN                  BIT(6)
 118 #define TMP401_STATUS_LOCAL_CRIT                BIT(0)
 119 #define TMP401_STATUS_REMOTE_CRIT               BIT(1)
 120 #define TMP401_STATUS_REMOTE_OPEN               BIT(2)
 121 #define TMP401_STATUS_REMOTE_LOW                BIT(3)
 122 #define TMP401_STATUS_REMOTE_HIGH               BIT(4)
 123 #define TMP401_STATUS_LOCAL_LOW                 BIT(5)
 124 #define TMP401_STATUS_LOCAL_HIGH                BIT(6)
 125
 126 /* On TMP432, each status has its own register */
 127 #define TMP432_STATUS_LOCAL                     BIT(0)
 128 #define TMP432_STATUS_REMOTE1                   BIT(1)
 129 #define TMP432_STATUS_REMOTE2                   BIT(2)
 130
 131 /* Manufacturer / Device ID's */
 132 #define TMP401_MANUFACTURER_ID                  0x55
 133 #define TMP401_DEVICE_ID                        0x11
 134 #define TMP411A_DEVICE_ID                       0x12
 135 #define TMP411B_DEVICE_ID                       0x13
 136 #define TMP411C_DEVICE_ID                       0x10
 137 #define TMP431_DEVICE_ID                        0x31
 138 #define TMP432_DEVICE_ID                        0x32
 139
 140 /*
 141  * Driver data (common to all clients)
 142  */
 143
 144 static const struct i2c_device_id tmp401_id[] = {
 145         { "tmp401", tmp401 },
 146         { "tmp411", tmp411 },
 147         { "tmp431", tmp431 },
 148         { "tmp432", tmp432 },
 149         { }
 150 };
 151 MODULE_DEVICE_TABLE(i2c, tmp401_id);
 152
 153 /*
 154  * Client data (each client gets its own)
 155  */
 156
 157 struct tmp401_data {
 158         struct device *hwmon_dev;
 159         struct mutex update_lock;
 160         char valid; /* zero until following fields are valid */
 161         unsigned long last_updated; /* in jiffies */
 162         enum chips kind;
 163
 164         unsigned int update_interval;   /* in milliseconds */
 165
 166         /* register values */
 167         u8 status[4];
 168         u8 config;
 169         u16 temp[6][3];
 170         u8 temp_crit_hyst;
 171 };
 172
 173 /*
 174  * Sysfs attr show / store functions
 175  */
 176
 177 static int tmp401_register_to_temp(u16 reg, u8 config)
 178 {
 179         int temp = reg;
 180
 181         if (config & TMP401_CONFIG_RANGE)
 182                 temp -= 64 * 256;
 183
 184         return DIV_ROUND_CLOSEST(temp * 125, 32);
 185 }
 186
 187 static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
 188 {
 189         if (config & TMP401_CONFIG_RANGE) {
 190                 temp = clamp_val(temp, -64000, 191000);
 191                 temp += 64000;
 192         } else
 193                 temp = clamp_val(temp, 0, 127000);
 194
 195         return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
 196 }
 197
 198 static int tmp401_update_device_reg16(struct i2c_client *client,
 199                                       struct tmp401_data *data)
 200 {
 201         int i, j, val;
 202         int num_regs = data->kind == tmp411 ? 6 : 4;
 203         int num_sensors = data->kind == tmp432 ? 3 : 2;
 204
 205         for (i = 0; i < num_sensors; i++) {             /* local / r1 / r2 */
 206                 for (j = 0; j < num_regs; j++) {        /* temp / low / ... */
 207                         u8 regaddr;
 208                         /*
 209                          * High byte must be read first immediately followed
 210                          * by the low byte
 211                          */
 212                         regaddr = data->kind == tmp432 ?
 213                                                 TMP432_TEMP_MSB_READ[j][i] :
 214                                                 TMP401_TEMP_MSB_READ[j][i];
 215                         val = i2c_smbus_read_byte_data(client, regaddr);
 216                         if (val < 0)
 217                                 return val;
 218                         data->temp[j][i] = val << 8;
 219                         if (j == 3)             /* crit is msb only */
 220                                 continue;
 221                         regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[j][i]
 222                                                        : TMP401_TEMP_LSB[j][i];
 223                         val = i2c_smbus_read_byte_data(client, regaddr);
 224                         if (val < 0)
 225                                 return val;
 226                         data->temp[j][i] |= val;
 227                 }
 228         }
 229         return 0;
 230 }
 231
 232 static struct tmp401_data *tmp401_update_device(struct device *dev)
 233 {
 234         struct i2c_client *client = to_i2c_client(dev);
 235         struct tmp401_data *data = i2c_get_clientdata(client);
 236         struct tmp401_data *ret = data;
 237         int i, val;
 238         unsigned long next_update;
 239
 240         mutex_lock(&data->update_lock);
 241
 242         next_update = data->last_updated +
 243                       msecs_to_jiffies(data->update_interval);
 244         if (time_after(jiffies, next_update) || !data->valid) {
 245                 if (data->kind != tmp432) {
 246                         /*
 247                          * The driver uses the TMP432 status format internally.
 248                          * Convert status to TMP432 format for other chips.
 249                          */
 250                         val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
 251                         if (val < 0) {
 252                                 ret = ERR_PTR(val);
 253                                 goto abort;
 254                         }
 255                         data->status[0] =
 256                           (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
 257                         data->status[1] =
 258                           ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
 259                           ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
 260                         data->status[2] =
 261                           ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
 262                           ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
 263                         data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
 264                                                 | TMP401_STATUS_REMOTE_CRIT);
 265                 } else {
 266                         for (i = 0; i < ARRAY_SIZE(data->status); i++) {
 267                                 val = i2c_smbus_read_byte_data(client,
 268                                                         TMP432_STATUS_REG[i]);
 269                                 if (val < 0) {
 270                                         ret = ERR_PTR(val);
 271                                         goto abort;
 272                                 }
 273                                 data->status[i] = val;
 274                         }
 275                 }
 276
 277                 val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 278                 if (val < 0) {
 279                         ret = ERR_PTR(val);
 280                         goto abort;
 281                 }
 282                 data->config = val;
 283                 val = tmp401_update_device_reg16(client, data);
 284                 if (val < 0) {
 285                         ret = ERR_PTR(val);
 286                         goto abort;
 287                 }
 288                 val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
 289                 if (val < 0) {
 290                         ret = ERR_PTR(val);
 291                         goto abort;
 292                 }
 293                 data->temp_crit_hyst = val;
 294
 295                 data->last_updated = jiffies;
 296                 data->valid = 1;
 297         }
 298
 299 abort:
 300         mutex_unlock(&data->update_lock);
 301         return ret;
 302 }
 303
 304 static ssize_t show_temp(struct device *dev,
 305                          struct device_attribute *devattr, char *buf)
 306 {
 307         int nr = to_sensor_dev_attr_2(devattr)->nr;
 308         int index = to_sensor_dev_attr_2(devattr)->index;
 309         struct tmp401_data *data = tmp401_update_device(dev);
 310
 311         if (IS_ERR(data))
 312                 return PTR_ERR(data);
 313
 314         return sprintf(buf, "%d\n",
 315                 tmp401_register_to_temp(data->temp[nr][index], data->config));
 316 }
 317
 318 static ssize_t show_temp_crit_hyst(struct device *dev,
 319         struct device_attribute *devattr, char *buf)
 320 {
 321         int temp, index = to_sensor_dev_attr(devattr)->index;
 322         struct tmp401_data *data = tmp401_update_device(dev);
 323
 324         if (IS_ERR(data))
 325                 return PTR_ERR(data);
 326
 327         mutex_lock(&data->update_lock);
 328         temp = tmp401_register_to_temp(data->temp[3][index], data->config);
 329         temp -= data->temp_crit_hyst * 1000;
 330         mutex_unlock(&data->update_lock);
 331
 332         return sprintf(buf, "%d\n", temp);
 333 }
 334
 335 static ssize_t show_status(struct device *dev,
 336         struct device_attribute *devattr, char *buf)
 337 {
 338         int nr = to_sensor_dev_attr_2(devattr)->nr;
 339         int mask = to_sensor_dev_attr_2(devattr)->index;
 340         struct tmp401_data *data = tmp401_update_device(dev);
 341
 342         if (IS_ERR(data))
 343                 return PTR_ERR(data);
 344
 345         return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
 346 }
 347
 348 static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
 349                           const char *buf, size_t count)
 350 {
 351         int nr = to_sensor_dev_attr_2(devattr)->nr;
 352         int index = to_sensor_dev_attr_2(devattr)->index;
 353         struct i2c_client *client = to_i2c_client(dev);
 354         struct tmp401_data *data = tmp401_update_device(dev);
 355         long val;
 356         u16 reg;
 357         u8 regaddr;
 358
 359         if (IS_ERR(data))
 360                 return PTR_ERR(data);
 361
 362         if (kstrtol(buf, 10, &val))
 363                 return -EINVAL;
 364
 365         reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
 366
 367         mutex_lock(&data->update_lock);
 368
 369         regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
 370                                        : TMP401_TEMP_MSB_WRITE[nr][index];
 371         i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
 372         if (nr != 3) {
 373                 regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[nr][index]
 374                                                : TMP401_TEMP_LSB[nr][index];
 375                 i2c_smbus_write_byte_data(client, regaddr, reg & 0xFF);
 376         }
 377         data->temp[nr][index] = reg;
 378
 379         mutex_unlock(&data->update_lock);
 380
 381         return count;
 382 }
 383
 384 static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
 385         *devattr, const char *buf, size_t count)
 386 {
 387         int temp, index = to_sensor_dev_attr(devattr)->index;
 388         struct tmp401_data *data = tmp401_update_device(dev);
 389         long val;
 390         u8 reg;
 391
 392         if (IS_ERR(data))
 393                 return PTR_ERR(data);
 394
 395         if (kstrtol(buf, 10, &val))
 396                 return -EINVAL;
 397
 398         if (data->config & TMP401_CONFIG_RANGE)
 399                 val = clamp_val(val, -64000, 191000);
 400         else
 401                 val = clamp_val(val, 0, 127000);
 402
 403         mutex_lock(&data->update_lock);
 404         temp = tmp401_register_to_temp(data->temp[3][index], data->config);
 405         val = clamp_val(val, temp - 255000, temp);
 406         reg = ((temp - val) + 500) / 1000;
 407
 408         i2c_smbus_write_byte_data(to_i2c_client(dev), TMP401_TEMP_CRIT_HYST,
 409                                   reg);
 410
 411         data->temp_crit_hyst = reg;
 412
 413         mutex_unlock(&data->update_lock);
 414
 415         return count;
 416 }
 417
 418 /*
 419  * Resets the historical measurements of minimum and maximum temperatures.
 420  * This is done by writing any value to any of the minimum/maximum registers
 421  * (0x30-0x37).
 422  */
 423 static ssize_t reset_temp_history(struct device *dev,
 424         struct device_attribute *devattr, const char *buf, size_t count)
 425 {
 426         struct i2c_client *client = to_i2c_client(dev);
 427         struct tmp401_data *data = i2c_get_clientdata(client);
 428         long val;
 429
 430         if (kstrtol(buf, 10, &val))
 431                 return -EINVAL;
 432
 433         if (val != 1) {
 434                 dev_err(dev,
 435                         "temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
 436                         val);
 437                 return -EINVAL;
 438         }
 439         mutex_lock(&data->update_lock);
 440         i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
 441         data->valid = 0;
 442         mutex_unlock(&data->update_lock);
 443
 444         return count;
 445 }
 446
 447 static ssize_t show_update_interval(struct device *dev,
 448                                     struct device_attribute *attr, char *buf)
 449 {
 450         struct i2c_client *client = to_i2c_client(dev);
 451         struct tmp401_data *data = i2c_get_clientdata(client);
 452
 453         return sprintf(buf, "%u\n", data->update_interval);
 454 }
 455
 456 static ssize_t set_update_interval(struct device *dev,
 457                                    struct device_attribute *attr,
 458                                    const char *buf, size_t count)
 459 {
 460         struct i2c_client *client = to_i2c_client(dev);
 461         struct tmp401_data *data = i2c_get_clientdata(client);
 462         unsigned long val;
 463         int err, rate;
 464
 465         err = kstrtoul(buf, 10, &val);
 466         if (err)
 467                 return err;
 468
 469         /*
 470          * For valid rates, interval can be calculated as
 471          *      interval = (1 << (7 - rate)) * 125;
 472          * Rounded rate is therefore
 473          *      rate = 7 - __fls(interval * 4 / (125 * 3));
 474          * Use clamp_val() to avoid overflows, and to ensure valid input
 475          * for __fls.
 476          */
 477         val = clamp_val(val, 125, 16000);
 478         rate = 7 - __fls(val * 4 / (125 * 3));
 479         mutex_lock(&data->update_lock);
 480         i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
 481         data->update_interval = (1 << (7 - rate)) * 125;
 482         mutex_unlock(&data->update_lock);
 483
 484         return count;
 485 }
 486
 487 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
 488 static SENSOR_DEVICE_ATTR_2(temp1_min, S_IWUSR | S_IRUGO, show_temp,
 489                             store_temp, 1, 0);
 490 static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp,
 491                             store_temp, 2, 0);
 492 static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
 493                             store_temp, 3, 0);
 494 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
 495                           show_temp_crit_hyst, store_temp_crit_hyst, 0);
 496 static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_status, NULL,
 497                             1, TMP432_STATUS_LOCAL);
 498 static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_status, NULL,
 499                             2, TMP432_STATUS_LOCAL);
 500 static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_status, NULL,
 501                             3, TMP432_STATUS_LOCAL);
 502 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
 503 static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp,
 504                             store_temp, 1, 1);
 505 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp,
 506                             store_temp, 2, 1);
 507 static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IWUSR | S_IRUGO, show_temp,
 508                             store_temp, 3, 1);
 509 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst,
 510                           NULL, 1);
 511 static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_status, NULL,
 512                             0, TMP432_STATUS_REMOTE1);
 513 static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_status, NULL,
 514                             1, TMP432_STATUS_REMOTE1);
 515 static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_status, NULL,
 516                             2, TMP432_STATUS_REMOTE1);
 517 static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_status, NULL,
 518                             3, TMP432_STATUS_REMOTE1);
 519
 520 static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
 521                    set_update_interval);
 522
 523 static struct attribute *tmp401_attributes[] = {
 524         &sensor_dev_attr_temp1_input.dev_attr.attr,
 525         &sensor_dev_attr_temp1_min.dev_attr.attr,
 526         &sensor_dev_attr_temp1_max.dev_attr.attr,
 527         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 528         &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
 529         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 530         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 531         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 532
 533         &sensor_dev_attr_temp2_input.dev_attr.attr,
 534         &sensor_dev_attr_temp2_min.dev_attr.attr,
 535         &sensor_dev_attr_temp2_max.dev_attr.attr,
 536         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 537         &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
 538         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 539         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 540         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 541         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 542
 543         &dev_attr_update_interval.attr,
 544
 545         NULL
 546 };
 547
 548 static const struct attribute_group tmp401_group = {
 549         .attrs = tmp401_attributes,
 550 };
 551
 552 /*
 553  * Additional features of the TMP411 chip.
 554  * The TMP411 stores the minimum and maximum
 555  * temperature measured since power-on, chip-reset, or
 556  * minimum and maximum register reset for both the local
 557  * and remote channels.
 558  */
 559 static SENSOR_DEVICE_ATTR_2(temp1_lowest, S_IRUGO, show_temp, NULL, 4, 0);
 560 static SENSOR_DEVICE_ATTR_2(temp1_highest, S_IRUGO, show_temp, NULL, 5, 0);
 561 static SENSOR_DEVICE_ATTR_2(temp2_lowest, S_IRUGO, show_temp, NULL, 4, 1);
 562 static SENSOR_DEVICE_ATTR_2(temp2_highest, S_IRUGO, show_temp, NULL, 5, 1);
 563 static SENSOR_DEVICE_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history,
 564                           0);
 565
 566 static struct attribute *tmp411_attributes[] = {
 567         &sensor_dev_attr_temp1_highest.dev_attr.attr,
 568         &sensor_dev_attr_temp1_lowest.dev_attr.attr,
 569         &sensor_dev_attr_temp2_highest.dev_attr.attr,
 570         &sensor_dev_attr_temp2_lowest.dev_attr.attr,
 571         &sensor_dev_attr_temp_reset_history.dev_attr.attr,
 572         NULL
 573 };
 574
 575 static const struct attribute_group tmp411_group = {
 576         .attrs = tmp411_attributes,
 577 };
 578
 579 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0, 2);
 580 static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp,
 581                             store_temp, 1, 2);
 582 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp,
 583                             store_temp, 2, 2);
 584 static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
 585                             store_temp, 3, 2);
 586 static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temp_crit_hyst,
 587                           NULL, 2);
 588 static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_status, NULL,
 589                             0, TMP432_STATUS_REMOTE2);
 590 static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_status, NULL,
 591                             1, TMP432_STATUS_REMOTE2);
 592 static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_status, NULL,
 593                             2, TMP432_STATUS_REMOTE2);
 594 static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_status, NULL,
 595                             3, TMP432_STATUS_REMOTE2);
 596
 597 static struct attribute *tmp432_attributes[] = {
 598         &sensor_dev_attr_temp3_input.dev_attr.attr,
 599         &sensor_dev_attr_temp3_min.dev_attr.attr,
 600         &sensor_dev_attr_temp3_max.dev_attr.attr,
 601         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 602         &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
 603         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 604         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 605         &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
 606         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 607
 608         NULL
 609 };
 610
 611 static const struct attribute_group tmp432_group = {
 612         .attrs = tmp432_attributes,
 613 };
 614
 615 /*
 616  * Begin non sysfs callback code (aka Real code)
 617  */
 618
 619 static void tmp401_init_client(struct i2c_client *client)
 620 {
 621         int config, config_orig;
 622         struct tmp401_data *data = i2c_get_clientdata(client);
 623
 624         /* Set the conversion rate to 2 Hz */
 625         i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
 626         data->update_interval = 500;
 627
 628         /* Start conversions (disable shutdown if necessary) */
 629         config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 630         if (config < 0) {
 631                 dev_warn(&client->dev, "Initialization failed!\n");
 632                 return;
 633         }
 634
 635         config_orig = config;
 636         config &= ~TMP401_CONFIG_SHUTDOWN;
 637
 638         if (config != config_orig)
 639                 i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config);
 640 }
 641
 642 static int tmp401_detect(struct i2c_client *client,
 643                          struct i2c_board_info *info)
 644 {
 645         enum chips kind;
 646         struct i2c_adapter *adapter = client->adapter;
 647         u8 reg;
 648
 649         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 650                 return -ENODEV;
 651
 652         /* Detect and identify the chip */
 653         reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
 654         if (reg != TMP401_MANUFACTURER_ID)
 655                 return -ENODEV;
 656
 657         reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
 658
 659         switch (reg) {
 660         case TMP401_DEVICE_ID:
 661                 if (client->addr != 0x4c)
 662                         return -ENODEV;
 663                 kind = tmp401;
 664                 break;
 665         case TMP411A_DEVICE_ID:
 666                 if (client->addr != 0x4c)
 667                         return -ENODEV;
 668                 kind = tmp411;
 669                 break;
 670         case TMP411B_DEVICE_ID:
 671                 if (client->addr != 0x4d)
 672                         return -ENODEV;
 673                 kind = tmp411;
 674                 break;
 675         case TMP411C_DEVICE_ID:
 676                 if (client->addr != 0x4e)
 677                         return -ENODEV;
 678                 kind = tmp411;
 679                 break;
 680         case TMP431_DEVICE_ID:
 681                 if (client->addr == 0x4e)
 682                         return -ENODEV;
 683                 kind = tmp431;
 684                 break;
 685         case TMP432_DEVICE_ID:
 686                 if (client->addr == 0x4e)
 687                         return -ENODEV;
 688                 kind = tmp432;
 689                 break;
 690         default:
 691                 return -ENODEV;
 692         }
 693
 694         reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 695         if (reg & 0x1b)
 696                 return -ENODEV;
 697
 698         reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
 699         /* Datasheet says: 0x1-0x6 */
 700         if (reg > 15)
 701                 return -ENODEV;
 702
 703         strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
 704
 705         return 0;
 706 }
 707
 708 static int tmp401_remove(struct i2c_client *client)
 709 {
 710         struct device *dev = &client->dev;
 711         struct tmp401_data *data = i2c_get_clientdata(client);
 712
 713         if (data->hwmon_dev)
 714                 hwmon_device_unregister(data->hwmon_dev);
 715
 716         sysfs_remove_group(&dev->kobj, &tmp401_group);
 717
 718         if (data->kind == tmp411)
 719                 sysfs_remove_group(&dev->kobj, &tmp411_group);
 720
 721         if (data->kind == tmp432)
 722                 sysfs_remove_group(&dev->kobj, &tmp432_group);
 723
 724         return 0;
 725 }
 726
 727 static int tmp401_probe(struct i2c_client *client,
 728                         const struct i2c_device_id *id)
 729 {
 730         struct device *dev = &client->dev;
 731         int err;
 732         struct tmp401_data *data;
 733         const char *names[] = { "TMP401", "TMP411", "TMP431", "TMP432" };
 734
 735         data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
 736         if (!data)
 737                 return -ENOMEM;
 738
 739         i2c_set_clientdata(client, data);
 740         mutex_init(&data->update_lock);
 741         data->kind = id->driver_data;
 742
 743         /* Initialize the TMP401 chip */
 744         tmp401_init_client(client);
 745
 746         /* Register sysfs hooks */
 747         err = sysfs_create_group(&dev->kobj, &tmp401_group);
 748         if (err)
 749                 return err;
 750
 751         /* Register additional tmp411 sysfs hooks */
 752         if (data->kind == tmp411) {
 753                 err = sysfs_create_group(&dev->kobj, &tmp411_group);
 754                 if (err)
 755                         goto exit_remove;
 756         }
 757
 758         /* Register additional tmp432 sysfs hooks */
 759         if (data->kind == tmp432) {
 760                 err = sysfs_create_group(&dev->kobj, &tmp432_group);
 761                 if (err)
 762                         goto exit_remove;
 763         }
 764
 765         data->hwmon_dev = hwmon_device_register(dev);
 766         if (IS_ERR(data->hwmon_dev)) {
 767                 err = PTR_ERR(data->hwmon_dev);
 768                 data->hwmon_dev = NULL;
 769                 goto exit_remove;
 770         }
 771
 772         dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
 773
 774         return 0;
 775
 776 exit_remove:
 777         tmp401_remove(client);
 778         return err;
 779 }
 780
 781 static struct i2c_driver tmp401_driver = {
 782         .class          = I2C_CLASS_HWMON,
 783         .driver = {
 784                 .name   = "tmp401",
 785         },
 786         .probe          = tmp401_probe,
 787         .remove         = tmp401_remove,
 788         .id_table       = tmp401_id,
 789         .detect         = tmp401_detect,
 790         .address_list   = normal_i2c,
 791 };
 792
 793 module_i2c_driver(tmp401_driver);
 794
 795 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 796 MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
 797 MODULE_LICENSE("GPL");