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 i2c_client *client;
 159         const struct attribute_group *groups[3];
 160         struct mutex update_lock;
 161         char valid; /* zero until following fields are valid */
 162         unsigned long last_updated; /* in jiffies */
 163         enum chips kind;
 164
 165         unsigned int update_interval;   /* in milliseconds */
 166
 167         /* register values */
 168         u8 status[4];
 169         u8 config;
 170         u16 temp[6][3];
 171         u8 temp_crit_hyst;
 172 };
 173
 174 /*
 175  * Sysfs attr show / store functions
 176  */
 177
 178 static int tmp401_register_to_temp(u16 reg, u8 config)
 179 {
 180         int temp = reg;
 181
 182         if (config & TMP401_CONFIG_RANGE)
 183                 temp -= 64 * 256;
 184
 185         return DIV_ROUND_CLOSEST(temp * 125, 32);
 186 }
 187
 188 static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
 189 {
 190         if (config & TMP401_CONFIG_RANGE) {
 191                 temp = clamp_val(temp, -64000, 191000);
 192                 temp += 64000;
 193         } else
 194                 temp = clamp_val(temp, 0, 127000);
 195
 196         return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
 197 }
 198
 199 static int tmp401_update_device_reg16(struct i2c_client *client,
 200                                       struct tmp401_data *data)
 201 {
 202         int i, j, val;
 203         int num_regs = data->kind == tmp411 ? 6 : 4;
 204         int num_sensors = data->kind == tmp432 ? 3 : 2;
 205
 206         for (i = 0; i < num_sensors; i++) {             /* local / r1 / r2 */
 207                 for (j = 0; j < num_regs; j++) {        /* temp / low / ... */
 208                         u8 regaddr;
 209                         /*
 210                          * High byte must be read first immediately followed
 211                          * by the low byte
 212                          */
 213                         regaddr = data->kind == tmp432 ?
 214                                                 TMP432_TEMP_MSB_READ[j][i] :
 215                                                 TMP401_TEMP_MSB_READ[j][i];
 216                         val = i2c_smbus_read_byte_data(client, regaddr);
 217                         if (val < 0)
 218                                 return val;
 219                         data->temp[j][i] = val << 8;
 220                         if (j == 3)             /* crit is msb only */
 221                                 continue;
 222                         regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[j][i]
 223                                                        : TMP401_TEMP_LSB[j][i];
 224                         val = i2c_smbus_read_byte_data(client, regaddr);
 225                         if (val < 0)
 226                                 return val;
 227                         data->temp[j][i] |= val;
 228                 }
 229         }
 230         return 0;
 231 }
 232
 233 static struct tmp401_data *tmp401_update_device(struct device *dev)
 234 {
 235         struct tmp401_data *data = dev_get_drvdata(dev);
 236         struct i2c_client *client = data->client;
 237         struct tmp401_data *ret = data;
 238         int i, val;
 239         unsigned long next_update;
 240
 241         mutex_lock(&data->update_lock);
 242
 243         next_update = data->last_updated +
 244                       msecs_to_jiffies(data->update_interval);
 245         if (time_after(jiffies, next_update) || !data->valid) {
 246                 if (data->kind != tmp432) {
 247                         /*
 248                          * The driver uses the TMP432 status format internally.
 249                          * Convert status to TMP432 format for other chips.
 250                          */
 251                         val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
 252                         if (val < 0) {
 253                                 ret = ERR_PTR(val);
 254                                 goto abort;
 255                         }
 256                         data->status[0] =
 257                           (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
 258                         data->status[1] =
 259                           ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
 260                           ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
 261                         data->status[2] =
 262                           ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
 263                           ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
 264                         data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
 265                                                 | TMP401_STATUS_REMOTE_CRIT);
 266                 } else {
 267                         for (i = 0; i < ARRAY_SIZE(data->status); i++) {
 268                                 val = i2c_smbus_read_byte_data(client,
 269                                                         TMP432_STATUS_REG[i]);
 270                                 if (val < 0) {
 271                                         ret = ERR_PTR(val);
 272                                         goto abort;
 273                                 }
 274                                 data->status[i] = val;
 275                         }
 276                 }
 277
 278                 val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 279                 if (val < 0) {
 280                         ret = ERR_PTR(val);
 281                         goto abort;
 282                 }
 283                 data->config = val;
 284                 val = tmp401_update_device_reg16(client, data);
 285                 if (val < 0) {
 286                         ret = ERR_PTR(val);
 287                         goto abort;
 288                 }
 289                 val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
 290                 if (val < 0) {
 291                         ret = ERR_PTR(val);
 292                         goto abort;
 293                 }
 294                 data->temp_crit_hyst = val;
 295
 296                 data->last_updated = jiffies;
 297                 data->valid = 1;
 298         }
 299
 300 abort:
 301         mutex_unlock(&data->update_lock);
 302         return ret;
 303 }
 304
 305 static ssize_t show_temp(struct device *dev,
 306                          struct device_attribute *devattr, char *buf)
 307 {
 308         int nr = to_sensor_dev_attr_2(devattr)->nr;
 309         int index = to_sensor_dev_attr_2(devattr)->index;
 310         struct tmp401_data *data = tmp401_update_device(dev);
 311
 312         if (IS_ERR(data))
 313                 return PTR_ERR(data);
 314
 315         return sprintf(buf, "%d\n",
 316                 tmp401_register_to_temp(data->temp[nr][index], data->config));
 317 }
 318
 319 static ssize_t show_temp_crit_hyst(struct device *dev,
 320         struct device_attribute *devattr, char *buf)
 321 {
 322         int temp, index = to_sensor_dev_attr(devattr)->index;
 323         struct tmp401_data *data = tmp401_update_device(dev);
 324
 325         if (IS_ERR(data))
 326                 return PTR_ERR(data);
 327
 328         mutex_lock(&data->update_lock);
 329         temp = tmp401_register_to_temp(data->temp[3][index], data->config);
 330         temp -= data->temp_crit_hyst * 1000;
 331         mutex_unlock(&data->update_lock);
 332
 333         return sprintf(buf, "%d\n", temp);
 334 }
 335
 336 static ssize_t show_status(struct device *dev,
 337         struct device_attribute *devattr, char *buf)
 338 {
 339         int nr = to_sensor_dev_attr_2(devattr)->nr;
 340         int mask = to_sensor_dev_attr_2(devattr)->index;
 341         struct tmp401_data *data = tmp401_update_device(dev);
 342
 343         if (IS_ERR(data))
 344                 return PTR_ERR(data);
 345
 346         return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
 347 }
 348
 349 static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
 350                           const char *buf, size_t count)
 351 {
 352         int nr = to_sensor_dev_attr_2(devattr)->nr;
 353         int index = to_sensor_dev_attr_2(devattr)->index;
 354         struct tmp401_data *data = dev_get_drvdata(dev);
 355         struct i2c_client *client = data->client;
 356         long val;
 357         u16 reg;
 358         u8 regaddr;
 359
 360         if (kstrtol(buf, 10, &val))
 361                 return -EINVAL;
 362
 363         reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
 364
 365         mutex_lock(&data->update_lock);
 366
 367         regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
 368                                        : TMP401_TEMP_MSB_WRITE[nr][index];
 369         i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
 370         if (nr != 3) {
 371                 regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[nr][index]
 372                                                : TMP401_TEMP_LSB[nr][index];
 373                 i2c_smbus_write_byte_data(client, regaddr, reg & 0xFF);
 374         }
 375         data->temp[nr][index] = reg;
 376
 377         mutex_unlock(&data->update_lock);
 378
 379         return count;
 380 }
 381
 382 static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
 383         *devattr, const char *buf, size_t count)
 384 {
 385         int temp, index = to_sensor_dev_attr(devattr)->index;
 386         struct tmp401_data *data = tmp401_update_device(dev);
 387         long val;
 388         u8 reg;
 389
 390         if (IS_ERR(data))
 391                 return PTR_ERR(data);
 392
 393         if (kstrtol(buf, 10, &val))
 394                 return -EINVAL;
 395
 396         if (data->config & TMP401_CONFIG_RANGE)
 397                 val = clamp_val(val, -64000, 191000);
 398         else
 399                 val = clamp_val(val, 0, 127000);
 400
 401         mutex_lock(&data->update_lock);
 402         temp = tmp401_register_to_temp(data->temp[3][index], data->config);
 403         val = clamp_val(val, temp - 255000, temp);
 404         reg = ((temp - val) + 500) / 1000;
 405
 406         i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
 407                                   reg);
 408
 409         data->temp_crit_hyst = reg;
 410
 411         mutex_unlock(&data->update_lock);
 412
 413         return count;
 414 }
 415
 416 /*
 417  * Resets the historical measurements of minimum and maximum temperatures.
 418  * This is done by writing any value to any of the minimum/maximum registers
 419  * (0x30-0x37).
 420  */
 421 static ssize_t reset_temp_history(struct device *dev,
 422         struct device_attribute *devattr, const char *buf, size_t count)
 423 {
 424         struct tmp401_data *data = dev_get_drvdata(dev);
 425         struct i2c_client *client = data->client;
 426         long val;
 427
 428         if (kstrtol(buf, 10, &val))
 429                 return -EINVAL;
 430
 431         if (val != 1) {
 432                 dev_err(dev,
 433                         "temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
 434                         val);
 435                 return -EINVAL;
 436         }
 437         mutex_lock(&data->update_lock);
 438         i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
 439         data->valid = 0;
 440         mutex_unlock(&data->update_lock);
 441
 442         return count;
 443 }
 444
 445 static ssize_t show_update_interval(struct device *dev,
 446                                     struct device_attribute *attr, char *buf)
 447 {
 448         struct tmp401_data *data = dev_get_drvdata(dev);
 449
 450         return sprintf(buf, "%u\n", data->update_interval);
 451 }
 452
 453 static ssize_t set_update_interval(struct device *dev,
 454                                    struct device_attribute *attr,
 455                                    const char *buf, size_t count)
 456 {
 457         struct tmp401_data *data = dev_get_drvdata(dev);
 458         struct i2c_client *client = data->client;
 459         unsigned long val;
 460         int err, rate;
 461
 462         err = kstrtoul(buf, 10, &val);
 463         if (err)
 464                 return err;
 465
 466         /*
 467          * For valid rates, interval can be calculated as
 468          *      interval = (1 << (7 - rate)) * 125;
 469          * Rounded rate is therefore
 470          *      rate = 7 - __fls(interval * 4 / (125 * 3));
 471          * Use clamp_val() to avoid overflows, and to ensure valid input
 472          * for __fls.
 473          */
 474         val = clamp_val(val, 125, 16000);
 475         rate = 7 - __fls(val * 4 / (125 * 3));
 476         mutex_lock(&data->update_lock);
 477         i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
 478         data->update_interval = (1 << (7 - rate)) * 125;
 479         mutex_unlock(&data->update_lock);
 480
 481         return count;
 482 }
 483
 484 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
 485 static SENSOR_DEVICE_ATTR_2(temp1_min, S_IWUSR | S_IRUGO, show_temp,
 486                             store_temp, 1, 0);
 487 static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp,
 488                             store_temp, 2, 0);
 489 static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
 490                             store_temp, 3, 0);
 491 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
 492                           show_temp_crit_hyst, store_temp_crit_hyst, 0);
 493 static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_status, NULL,
 494                             1, TMP432_STATUS_LOCAL);
 495 static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_status, NULL,
 496                             2, TMP432_STATUS_LOCAL);
 497 static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_status, NULL,
 498                             3, TMP432_STATUS_LOCAL);
 499 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
 500 static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp,
 501                             store_temp, 1, 1);
 502 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp,
 503                             store_temp, 2, 1);
 504 static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IWUSR | S_IRUGO, show_temp,
 505                             store_temp, 3, 1);
 506 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst,
 507                           NULL, 1);
 508 static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_status, NULL,
 509                             0, TMP432_STATUS_REMOTE1);
 510 static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_status, NULL,
 511                             1, TMP432_STATUS_REMOTE1);
 512 static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_status, NULL,
 513                             2, TMP432_STATUS_REMOTE1);
 514 static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_status, NULL,
 515                             3, TMP432_STATUS_REMOTE1);
 516
 517 static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
 518                    set_update_interval);
 519
 520 static struct attribute *tmp401_attributes[] = {
 521         &sensor_dev_attr_temp1_input.dev_attr.attr,
 522         &sensor_dev_attr_temp1_min.dev_attr.attr,
 523         &sensor_dev_attr_temp1_max.dev_attr.attr,
 524         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 525         &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
 526         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 527         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 528         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 529
 530         &sensor_dev_attr_temp2_input.dev_attr.attr,
 531         &sensor_dev_attr_temp2_min.dev_attr.attr,
 532         &sensor_dev_attr_temp2_max.dev_attr.attr,
 533         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 534         &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
 535         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 536         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 537         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 538         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 539
 540         &dev_attr_update_interval.attr,
 541
 542         NULL
 543 };
 544
 545 static const struct attribute_group tmp401_group = {
 546         .attrs = tmp401_attributes,
 547 };
 548
 549 /*
 550  * Additional features of the TMP411 chip.
 551  * The TMP411 stores the minimum and maximum
 552  * temperature measured since power-on, chip-reset, or
 553  * minimum and maximum register reset for both the local
 554  * and remote channels.
 555  */
 556 static SENSOR_DEVICE_ATTR_2(temp1_lowest, S_IRUGO, show_temp, NULL, 4, 0);
 557 static SENSOR_DEVICE_ATTR_2(temp1_highest, S_IRUGO, show_temp, NULL, 5, 0);
 558 static SENSOR_DEVICE_ATTR_2(temp2_lowest, S_IRUGO, show_temp, NULL, 4, 1);
 559 static SENSOR_DEVICE_ATTR_2(temp2_highest, S_IRUGO, show_temp, NULL, 5, 1);
 560 static SENSOR_DEVICE_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history,
 561                           0);
 562
 563 static struct attribute *tmp411_attributes[] = {
 564         &sensor_dev_attr_temp1_highest.dev_attr.attr,
 565         &sensor_dev_attr_temp1_lowest.dev_attr.attr,
 566         &sensor_dev_attr_temp2_highest.dev_attr.attr,
 567         &sensor_dev_attr_temp2_lowest.dev_attr.attr,
 568         &sensor_dev_attr_temp_reset_history.dev_attr.attr,
 569         NULL
 570 };
 571
 572 static const struct attribute_group tmp411_group = {
 573         .attrs = tmp411_attributes,
 574 };
 575
 576 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0, 2);
 577 static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp,
 578                             store_temp, 1, 2);
 579 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp,
 580                             store_temp, 2, 2);
 581 static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
 582                             store_temp, 3, 2);
 583 static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temp_crit_hyst,
 584                           NULL, 2);
 585 static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_status, NULL,
 586                             0, TMP432_STATUS_REMOTE2);
 587 static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_status, NULL,
 588                             1, TMP432_STATUS_REMOTE2);
 589 static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_status, NULL,
 590                             2, TMP432_STATUS_REMOTE2);
 591 static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_status, NULL,
 592                             3, TMP432_STATUS_REMOTE2);
 593
 594 static struct attribute *tmp432_attributes[] = {
 595         &sensor_dev_attr_temp3_input.dev_attr.attr,
 596         &sensor_dev_attr_temp3_min.dev_attr.attr,
 597         &sensor_dev_attr_temp3_max.dev_attr.attr,
 598         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 599         &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
 600         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 601         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 602         &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
 603         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 604
 605         NULL
 606 };
 607
 608 static const struct attribute_group tmp432_group = {
 609         .attrs = tmp432_attributes,
 610 };
 611
 612 /*
 613  * Begin non sysfs callback code (aka Real code)
 614  */
 615
 616 static void tmp401_init_client(struct tmp401_data *data,
 617                                struct i2c_client *client)
 618 {
 619         int config, config_orig;
 620
 621         /* Set the conversion rate to 2 Hz */
 622         i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
 623         data->update_interval = 500;
 624
 625         /* Start conversions (disable shutdown if necessary) */
 626         config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 627         if (config < 0) {
 628                 dev_warn(&client->dev, "Initialization failed!\n");
 629                 return;
 630         }
 631
 632         config_orig = config;
 633         config &= ~TMP401_CONFIG_SHUTDOWN;
 634
 635         if (config != config_orig)
 636                 i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config);
 637 }
 638
 639 static int tmp401_detect(struct i2c_client *client,
 640                          struct i2c_board_info *info)
 641 {
 642         enum chips kind;
 643         struct i2c_adapter *adapter = client->adapter;
 644         u8 reg;
 645
 646         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 647                 return -ENODEV;
 648
 649         /* Detect and identify the chip */
 650         reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
 651         if (reg != TMP401_MANUFACTURER_ID)
 652                 return -ENODEV;
 653
 654         reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
 655
 656         switch (reg) {
 657         case TMP401_DEVICE_ID:
 658                 if (client->addr != 0x4c)
 659                         return -ENODEV;
 660                 kind = tmp401;
 661                 break;
 662         case TMP411A_DEVICE_ID:
 663                 if (client->addr != 0x4c)
 664                         return -ENODEV;
 665                 kind = tmp411;
 666                 break;
 667         case TMP411B_DEVICE_ID:
 668                 if (client->addr != 0x4d)
 669                         return -ENODEV;
 670                 kind = tmp411;
 671                 break;
 672         case TMP411C_DEVICE_ID:
 673                 if (client->addr != 0x4e)
 674                         return -ENODEV;
 675                 kind = tmp411;
 676                 break;
 677         case TMP431_DEVICE_ID:
 678                 if (client->addr == 0x4e)
 679                         return -ENODEV;
 680                 kind = tmp431;
 681                 break;
 682         case TMP432_DEVICE_ID:
 683                 if (client->addr == 0x4e)
 684                         return -ENODEV;
 685                 kind = tmp432;
 686                 break;
 687         default:
 688                 return -ENODEV;
 689         }
 690
 691         reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 692         if (reg & 0x1b)
 693                 return -ENODEV;
 694
 695         reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
 696         /* Datasheet says: 0x1-0x6 */
 697         if (reg > 15)
 698                 return -ENODEV;
 699
 700         strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
 701
 702         return 0;
 703 }
 704
 705 static int tmp401_probe(struct i2c_client *client,
 706                         const struct i2c_device_id *id)
 707 {
 708         const char *names[] = { "TMP401", "TMP411", "TMP431", "TMP432" };
 709         struct device *dev = &client->dev;
 710         struct device *hwmon_dev;
 711         struct tmp401_data *data;
 712         int groups = 0;
 713
 714         data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
 715         if (!data)
 716                 return -ENOMEM;
 717
 718         data->client = client;
 719         mutex_init(&data->update_lock);
 720         data->kind = id->driver_data;
 721
 722         /* Initialize the TMP401 chip */
 723         tmp401_init_client(data, client);
 724
 725         /* Register sysfs hooks */
 726         data->groups[groups++] = &tmp401_group;
 727
 728         /* Register additional tmp411 sysfs hooks */
 729         if (data->kind == tmp411)
 730                 data->groups[groups++] = &tmp411_group;
 731
 732         /* Register additional tmp432 sysfs hooks */
 733         if (data->kind == tmp432)
 734                 data->groups[groups++] = &tmp432_group;
 735
 736         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 737                                                            data, data->groups);
 738         if (IS_ERR(hwmon_dev))
 739                 return PTR_ERR(hwmon_dev);
 740
 741         dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
 742
 743         return 0;
 744 }
 745
 746 static struct i2c_driver tmp401_driver = {
 747         .class          = I2C_CLASS_HWMON,
 748         .driver = {
 749                 .name   = "tmp401",
 750         },
 751         .probe          = tmp401_probe,
 752         .id_table       = tmp401_id,
 753         .detect         = tmp401_detect,
 754         .address_list   = normal_i2c,
 755 };
 756
 757 module_i2c_driver(tmp401_driver);
 758
 759 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 760 MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
 761 MODULE_LICENSE("GPL");