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[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d,
  48         0x4e, 0x4f, I2C_CLIENT_END };
  49
  50 enum chips { tmp401, tmp411, tmp431, tmp432, tmp435 };
  51
  52 /*
  53  * The TMP401 registers, note some registers have different addresses for
  54  * reading and writing
  55  */
  56 #define TMP401_STATUS                           0x02
  57 #define TMP401_CONFIG_READ                      0x03
  58 #define TMP401_CONFIG_WRITE                     0x09
  59 #define TMP401_CONVERSION_RATE_READ             0x04
  60 #define TMP401_CONVERSION_RATE_WRITE            0x0A
  61 #define TMP401_TEMP_CRIT_HYST                   0x21
  62 #define TMP401_MANUFACTURER_ID_REG              0xFE
  63 #define TMP401_DEVICE_ID_REG                    0xFF
  64
  65 static const u8 TMP401_TEMP_MSB_READ[6][2] = {
  66         { 0x00, 0x01 }, /* temp */
  67         { 0x06, 0x08 }, /* low limit */
  68         { 0x05, 0x07 }, /* high limit */
  69         { 0x20, 0x19 }, /* therm (crit) limit */
  70         { 0x30, 0x34 }, /* lowest */
  71         { 0x32, 0x36 }, /* highest */
  72 };
  73
  74 static const u8 TMP401_TEMP_MSB_WRITE[6][2] = {
  75         { 0, 0 },       /* temp (unused) */
  76         { 0x0C, 0x0E }, /* low limit */
  77         { 0x0B, 0x0D }, /* high limit */
  78         { 0x20, 0x19 }, /* therm (crit) limit */
  79         { 0x30, 0x34 }, /* lowest */
  80         { 0x32, 0x36 }, /* highest */
  81 };
  82
  83 static const u8 TMP401_TEMP_LSB[6][2] = {
  84         { 0x15, 0x10 }, /* temp */
  85         { 0x17, 0x14 }, /* low limit */
  86         { 0x16, 0x13 }, /* high limit */
  87         { 0, 0 },       /* therm (crit) limit (unused) */
  88         { 0x31, 0x35 }, /* lowest */
  89         { 0x33, 0x37 }, /* highest */
  90 };
  91
  92 static const u8 TMP432_TEMP_MSB_READ[4][3] = {
  93         { 0x00, 0x01, 0x23 },   /* temp */
  94         { 0x06, 0x08, 0x16 },   /* low limit */
  95         { 0x05, 0x07, 0x15 },   /* high limit */
  96         { 0x20, 0x19, 0x1A },   /* therm (crit) limit */
  97 };
  98
  99 static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
 100         { 0, 0, 0 },            /* temp  - unused */
 101         { 0x0C, 0x0E, 0x16 },   /* low limit */
 102         { 0x0B, 0x0D, 0x15 },   /* high limit */
 103         { 0x20, 0x19, 0x1A },   /* therm (crit) limit */
 104 };
 105
 106 static const u8 TMP432_TEMP_LSB[3][3] = {
 107         { 0x29, 0x10, 0x24 },   /* temp */
 108         { 0x3E, 0x14, 0x18 },   /* low limit */
 109         { 0x3D, 0x13, 0x17 },   /* high limit */
 110 };
 111
 112 /* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
 113 static const u8 TMP432_STATUS_REG[] = {
 114         0x1b, 0x36, 0x35, 0x37 };
 115
 116 /* Flags */
 117 #define TMP401_CONFIG_RANGE                     BIT(2)
 118 #define TMP401_CONFIG_SHUTDOWN                  BIT(6)
 119 #define TMP401_STATUS_LOCAL_CRIT                BIT(0)
 120 #define TMP401_STATUS_REMOTE_CRIT               BIT(1)
 121 #define TMP401_STATUS_REMOTE_OPEN               BIT(2)
 122 #define TMP401_STATUS_REMOTE_LOW                BIT(3)
 123 #define TMP401_STATUS_REMOTE_HIGH               BIT(4)
 124 #define TMP401_STATUS_LOCAL_LOW                 BIT(5)
 125 #define TMP401_STATUS_LOCAL_HIGH                BIT(6)
 126
 127 /* On TMP432, each status has its own register */
 128 #define TMP432_STATUS_LOCAL                     BIT(0)
 129 #define TMP432_STATUS_REMOTE1                   BIT(1)
 130 #define TMP432_STATUS_REMOTE2                   BIT(2)
 131
 132 /* Manufacturer / Device ID's */
 133 #define TMP401_MANUFACTURER_ID                  0x55
 134 #define TMP401_DEVICE_ID                        0x11
 135 #define TMP411A_DEVICE_ID                       0x12
 136 #define TMP411B_DEVICE_ID                       0x13
 137 #define TMP411C_DEVICE_ID                       0x10
 138 #define TMP431_DEVICE_ID                        0x31
 139 #define TMP432_DEVICE_ID                        0x32
 140 #define TMP435_DEVICE_ID                        0x35
 141
 142 /*
 143  * Driver data (common to all clients)
 144  */
 145
 146 static const struct i2c_device_id tmp401_id[] = {
 147         { "tmp401", tmp401 },
 148         { "tmp411", tmp411 },
 149         { "tmp431", tmp431 },
 150         { "tmp432", tmp432 },
 151         { "tmp435", tmp435 },
 152         { }
 153 };
 154 MODULE_DEVICE_TABLE(i2c, tmp401_id);
 155
 156 /*
 157  * Client data (each client gets its own)
 158  */
 159
 160 struct tmp401_data {
 161         struct i2c_client *client;
 162         const struct attribute_group *groups[3];
 163         struct mutex update_lock;
 164         char valid; /* zero until following fields are valid */
 165         unsigned long last_updated; /* in jiffies */
 166         enum chips kind;
 167
 168         unsigned int update_interval;   /* in milliseconds */
 169
 170         /* register values */
 171         u8 status[4];
 172         u8 config;
 173         u16 temp[6][3];
 174         u8 temp_crit_hyst;
 175 };
 176
 177 /*
 178  * Sysfs attr show / store functions
 179  */
 180
 181 static int tmp401_register_to_temp(u16 reg, u8 config)
 182 {
 183         int temp = reg;
 184
 185         if (config & TMP401_CONFIG_RANGE)
 186                 temp -= 64 * 256;
 187
 188         return DIV_ROUND_CLOSEST(temp * 125, 32);
 189 }
 190
 191 static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
 192 {
 193         if (config & TMP401_CONFIG_RANGE) {
 194                 temp = clamp_val(temp, -64000, 191000);
 195                 temp += 64000;
 196         } else
 197                 temp = clamp_val(temp, 0, 127000);
 198
 199         return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
 200 }
 201
 202 static int tmp401_update_device_reg16(struct i2c_client *client,
 203                                       struct tmp401_data *data)
 204 {
 205         int i, j, val;
 206         int num_regs = data->kind == tmp411 ? 6 : 4;
 207         int num_sensors = data->kind == tmp432 ? 3 : 2;
 208
 209         for (i = 0; i < num_sensors; i++) {             /* local / r1 / r2 */
 210                 for (j = 0; j < num_regs; j++) {        /* temp / low / ... */
 211                         u8 regaddr;
 212                         /*
 213                          * High byte must be read first immediately followed
 214                          * by the low byte
 215                          */
 216                         regaddr = data->kind == tmp432 ?
 217                                                 TMP432_TEMP_MSB_READ[j][i] :
 218                                                 TMP401_TEMP_MSB_READ[j][i];
 219                         val = i2c_smbus_read_byte_data(client, regaddr);
 220                         if (val < 0)
 221                                 return val;
 222                         data->temp[j][i] = val << 8;
 223                         if (j == 3)             /* crit is msb only */
 224                                 continue;
 225                         regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[j][i]
 226                                                        : TMP401_TEMP_LSB[j][i];
 227                         val = i2c_smbus_read_byte_data(client, regaddr);
 228                         if (val < 0)
 229                                 return val;
 230                         data->temp[j][i] |= val;
 231                 }
 232         }
 233         return 0;
 234 }
 235
 236 static struct tmp401_data *tmp401_update_device(struct device *dev)
 237 {
 238         struct tmp401_data *data = dev_get_drvdata(dev);
 239         struct i2c_client *client = data->client;
 240         struct tmp401_data *ret = data;
 241         int i, val;
 242         unsigned long next_update;
 243
 244         mutex_lock(&data->update_lock);
 245
 246         next_update = data->last_updated +
 247                       msecs_to_jiffies(data->update_interval);
 248         if (time_after(jiffies, next_update) || !data->valid) {
 249                 if (data->kind != tmp432) {
 250                         /*
 251                          * The driver uses the TMP432 status format internally.
 252                          * Convert status to TMP432 format for other chips.
 253                          */
 254                         val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
 255                         if (val < 0) {
 256                                 ret = ERR_PTR(val);
 257                                 goto abort;
 258                         }
 259                         data->status[0] =
 260                           (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
 261                         data->status[1] =
 262                           ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
 263                           ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
 264                         data->status[2] =
 265                           ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
 266                           ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
 267                         data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
 268                                                 | TMP401_STATUS_REMOTE_CRIT);
 269                 } else {
 270                         for (i = 0; i < ARRAY_SIZE(data->status); i++) {
 271                                 val = i2c_smbus_read_byte_data(client,
 272                                                         TMP432_STATUS_REG[i]);
 273                                 if (val < 0) {
 274                                         ret = ERR_PTR(val);
 275                                         goto abort;
 276                                 }
 277                                 data->status[i] = val;
 278                         }
 279                 }
 280
 281                 val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 282                 if (val < 0) {
 283                         ret = ERR_PTR(val);
 284                         goto abort;
 285                 }
 286                 data->config = val;
 287                 val = tmp401_update_device_reg16(client, data);
 288                 if (val < 0) {
 289                         ret = ERR_PTR(val);
 290                         goto abort;
 291                 }
 292                 val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
 293                 if (val < 0) {
 294                         ret = ERR_PTR(val);
 295                         goto abort;
 296                 }
 297                 data->temp_crit_hyst = val;
 298
 299                 data->last_updated = jiffies;
 300                 data->valid = 1;
 301         }
 302
 303 abort:
 304         mutex_unlock(&data->update_lock);
 305         return ret;
 306 }
 307
 308 static ssize_t show_temp(struct device *dev,
 309                          struct device_attribute *devattr, char *buf)
 310 {
 311         int nr = to_sensor_dev_attr_2(devattr)->nr;
 312         int index = to_sensor_dev_attr_2(devattr)->index;
 313         struct tmp401_data *data = tmp401_update_device(dev);
 314
 315         if (IS_ERR(data))
 316                 return PTR_ERR(data);
 317
 318         return sprintf(buf, "%d\n",
 319                 tmp401_register_to_temp(data->temp[nr][index], data->config));
 320 }
 321
 322 static ssize_t show_temp_crit_hyst(struct device *dev,
 323         struct device_attribute *devattr, char *buf)
 324 {
 325         int temp, index = to_sensor_dev_attr(devattr)->index;
 326         struct tmp401_data *data = tmp401_update_device(dev);
 327
 328         if (IS_ERR(data))
 329                 return PTR_ERR(data);
 330
 331         mutex_lock(&data->update_lock);
 332         temp = tmp401_register_to_temp(data->temp[3][index], data->config);
 333         temp -= data->temp_crit_hyst * 1000;
 334         mutex_unlock(&data->update_lock);
 335
 336         return sprintf(buf, "%d\n", temp);
 337 }
 338
 339 static ssize_t show_status(struct device *dev,
 340         struct device_attribute *devattr, char *buf)
 341 {
 342         int nr = to_sensor_dev_attr_2(devattr)->nr;
 343         int mask = to_sensor_dev_attr_2(devattr)->index;
 344         struct tmp401_data *data = tmp401_update_device(dev);
 345
 346         if (IS_ERR(data))
 347                 return PTR_ERR(data);
 348
 349         return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
 350 }
 351
 352 static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
 353                           const char *buf, size_t count)
 354 {
 355         int nr = to_sensor_dev_attr_2(devattr)->nr;
 356         int index = to_sensor_dev_attr_2(devattr)->index;
 357         struct tmp401_data *data = dev_get_drvdata(dev);
 358         struct i2c_client *client = data->client;
 359         long val;
 360         u16 reg;
 361         u8 regaddr;
 362
 363         if (kstrtol(buf, 10, &val))
 364                 return -EINVAL;
 365
 366         reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
 367
 368         mutex_lock(&data->update_lock);
 369
 370         regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
 371                                        : TMP401_TEMP_MSB_WRITE[nr][index];
 372         i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
 373         if (nr != 3) {
 374                 regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[nr][index]
 375                                                : TMP401_TEMP_LSB[nr][index];
 376                 i2c_smbus_write_byte_data(client, regaddr, reg & 0xFF);
 377         }
 378         data->temp[nr][index] = reg;
 379
 380         mutex_unlock(&data->update_lock);
 381
 382         return count;
 383 }
 384
 385 static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
 386         *devattr, const char *buf, size_t count)
 387 {
 388         int temp, index = to_sensor_dev_attr(devattr)->index;
 389         struct tmp401_data *data = tmp401_update_device(dev);
 390         long val;
 391         u8 reg;
 392
 393         if (IS_ERR(data))
 394                 return PTR_ERR(data);
 395
 396         if (kstrtol(buf, 10, &val))
 397                 return -EINVAL;
 398
 399         if (data->config & TMP401_CONFIG_RANGE)
 400                 val = clamp_val(val, -64000, 191000);
 401         else
 402                 val = clamp_val(val, 0, 127000);
 403
 404         mutex_lock(&data->update_lock);
 405         temp = tmp401_register_to_temp(data->temp[3][index], data->config);
 406         val = clamp_val(val, temp - 255000, temp);
 407         reg = ((temp - val) + 500) / 1000;
 408
 409         i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
 410                                   reg);
 411
 412         data->temp_crit_hyst = reg;
 413
 414         mutex_unlock(&data->update_lock);
 415
 416         return count;
 417 }
 418
 419 /*
 420  * Resets the historical measurements of minimum and maximum temperatures.
 421  * This is done by writing any value to any of the minimum/maximum registers
 422  * (0x30-0x37).
 423  */
 424 static ssize_t reset_temp_history(struct device *dev,
 425         struct device_attribute *devattr, const char *buf, size_t count)
 426 {
 427         struct tmp401_data *data = dev_get_drvdata(dev);
 428         struct i2c_client *client = data->client;
 429         long val;
 430
 431         if (kstrtol(buf, 10, &val))
 432                 return -EINVAL;
 433
 434         if (val != 1) {
 435                 dev_err(dev,
 436                         "temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
 437                         val);
 438                 return -EINVAL;
 439         }
 440         mutex_lock(&data->update_lock);
 441         i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
 442         data->valid = 0;
 443         mutex_unlock(&data->update_lock);
 444
 445         return count;
 446 }
 447
 448 static ssize_t show_update_interval(struct device *dev,
 449                                     struct device_attribute *attr, char *buf)
 450 {
 451         struct tmp401_data *data = dev_get_drvdata(dev);
 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 tmp401_data *data = dev_get_drvdata(dev);
 461         struct i2c_client *client = data->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 int tmp401_init_client(struct tmp401_data *data,
 620                               struct i2c_client *client)
 621 {
 622         int config, config_orig, status = 0;
 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                 return config;
 632
 633         config_orig = config;
 634         config &= ~TMP401_CONFIG_SHUTDOWN;
 635
 636         if (config != config_orig)
 637                 status = i2c_smbus_write_byte_data(client,
 638                                                    TMP401_CONFIG_WRITE,
 639                                                    config);
 640
 641         return status;
 642 }
 643
 644 static int tmp401_detect(struct i2c_client *client,
 645                          struct i2c_board_info *info)
 646 {
 647         enum chips kind;
 648         struct i2c_adapter *adapter = client->adapter;
 649         u8 reg;
 650
 651         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 652                 return -ENODEV;
 653
 654         /* Detect and identify the chip */
 655         reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
 656         if (reg != TMP401_MANUFACTURER_ID)
 657                 return -ENODEV;
 658
 659         reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
 660
 661         switch (reg) {
 662         case TMP401_DEVICE_ID:
 663                 if (client->addr != 0x4c)
 664                         return -ENODEV;
 665                 kind = tmp401;
 666                 break;
 667         case TMP411A_DEVICE_ID:
 668                 if (client->addr != 0x4c)
 669                         return -ENODEV;
 670                 kind = tmp411;
 671                 break;
 672         case TMP411B_DEVICE_ID:
 673                 if (client->addr != 0x4d)
 674                         return -ENODEV;
 675                 kind = tmp411;
 676                 break;
 677         case TMP411C_DEVICE_ID:
 678                 if (client->addr != 0x4e)
 679                         return -ENODEV;
 680                 kind = tmp411;
 681                 break;
 682         case TMP431_DEVICE_ID:
 683                 if (client->addr != 0x4c && client->addr != 0x4d)
 684                         return -ENODEV;
 685                 kind = tmp431;
 686                 break;
 687         case TMP432_DEVICE_ID:
 688                 if (client->addr != 0x4c && client->addr != 0x4d)
 689                         return -ENODEV;
 690                 kind = tmp432;
 691                 break;
 692         case TMP435_DEVICE_ID:
 693                 kind = tmp435;
 694                 break;
 695         default:
 696                 return -ENODEV;
 697         }
 698
 699         reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 700         if (reg & 0x1b)
 701                 return -ENODEV;
 702
 703         reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
 704         /* Datasheet says: 0x1-0x6 */
 705         if (reg > 15)
 706                 return -ENODEV;
 707
 708         strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
 709
 710         return 0;
 711 }
 712
 713 static int tmp401_probe(struct i2c_client *client,
 714                         const struct i2c_device_id *id)
 715 {
 716         static const char * const names[] = {
 717                 "TMP401", "TMP411", "TMP431", "TMP432", "TMP435"
 718         };
 719         struct device *dev = &client->dev;
 720         struct device *hwmon_dev;
 721         struct tmp401_data *data;
 722         int groups = 0, status;
 723
 724         data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
 725         if (!data)
 726                 return -ENOMEM;
 727
 728         data->client = client;
 729         mutex_init(&data->update_lock);
 730         data->kind = id->driver_data;
 731
 732         /* Initialize the TMP401 chip */
 733         status = tmp401_init_client(data, client);
 734         if (status < 0)
 735                 return status;
 736
 737         /* Register sysfs hooks */
 738         data->groups[groups++] = &tmp401_group;
 739
 740         /* Register additional tmp411 sysfs hooks */
 741         if (data->kind == tmp411)
 742                 data->groups[groups++] = &tmp411_group;
 743
 744         /* Register additional tmp432 sysfs hooks */
 745         if (data->kind == tmp432)
 746                 data->groups[groups++] = &tmp432_group;
 747
 748         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 749                                                            data, data->groups);
 750         if (IS_ERR(hwmon_dev))
 751                 return PTR_ERR(hwmon_dev);
 752
 753         dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
 754
 755         return 0;
 756 }
 757
 758 static struct i2c_driver tmp401_driver = {
 759         .class          = I2C_CLASS_HWMON,
 760         .driver = {
 761                 .name   = "tmp401",
 762         },
 763         .probe          = tmp401_probe,
 764         .id_table       = tmp401_id,
 765         .detect         = tmp401_detect,
 766         .address_list   = normal_i2c,
 767 };
 768
 769 module_i2c_driver(tmp401_driver);
 770
 771 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 772 MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
 773 MODULE_LICENSE("GPL");