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, tmp461 };
  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[7][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         { 0, 0x11 },    /* offset */
  73 };
  74
  75 static const u8 TMP401_TEMP_MSB_WRITE[7][2] = {
  76         { 0, 0 },       /* temp (unused) */
  77         { 0x0C, 0x0E }, /* low limit */
  78         { 0x0B, 0x0D }, /* high limit */
  79         { 0x20, 0x19 }, /* therm (crit) limit */
  80         { 0x30, 0x34 }, /* lowest */
  81         { 0x32, 0x36 }, /* highest */
  82         { 0, 0x11 },    /* offset */
  83 };
  84
  85 static const u8 TMP401_TEMP_LSB[7][2] = {
  86         { 0x15, 0x10 }, /* temp */
  87         { 0x17, 0x14 }, /* low limit */
  88         { 0x16, 0x13 }, /* high limit */
  89         { 0, 0 },       /* therm (crit) limit (unused) */
  90         { 0x31, 0x35 }, /* lowest */
  91         { 0x33, 0x37 }, /* highest */
  92         { 0, 0x12 },    /* offset */
  93 };
  94
  95 static const u8 TMP432_TEMP_MSB_READ[4][3] = {
  96         { 0x00, 0x01, 0x23 },   /* temp */
  97         { 0x06, 0x08, 0x16 },   /* low limit */
  98         { 0x05, 0x07, 0x15 },   /* high limit */
  99         { 0x20, 0x19, 0x1A },   /* therm (crit) limit */
 100 };
 101
 102 static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
 103         { 0, 0, 0 },            /* temp  - unused */
 104         { 0x0C, 0x0E, 0x16 },   /* low limit */
 105         { 0x0B, 0x0D, 0x15 },   /* high limit */
 106         { 0x20, 0x19, 0x1A },   /* therm (crit) limit */
 107 };
 108
 109 static const u8 TMP432_TEMP_LSB[3][3] = {
 110         { 0x29, 0x10, 0x24 },   /* temp */
 111         { 0x3E, 0x14, 0x18 },   /* low limit */
 112         { 0x3D, 0x13, 0x17 },   /* high limit */
 113 };
 114
 115 /* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
 116 static const u8 TMP432_STATUS_REG[] = {
 117         0x1b, 0x36, 0x35, 0x37 };
 118
 119 /* Flags */
 120 #define TMP401_CONFIG_RANGE                     BIT(2)
 121 #define TMP401_CONFIG_SHUTDOWN                  BIT(6)
 122 #define TMP401_STATUS_LOCAL_CRIT                BIT(0)
 123 #define TMP401_STATUS_REMOTE_CRIT               BIT(1)
 124 #define TMP401_STATUS_REMOTE_OPEN               BIT(2)
 125 #define TMP401_STATUS_REMOTE_LOW                BIT(3)
 126 #define TMP401_STATUS_REMOTE_HIGH               BIT(4)
 127 #define TMP401_STATUS_LOCAL_LOW                 BIT(5)
 128 #define TMP401_STATUS_LOCAL_HIGH                BIT(6)
 129
 130 /* On TMP432, each status has its own register */
 131 #define TMP432_STATUS_LOCAL                     BIT(0)
 132 #define TMP432_STATUS_REMOTE1                   BIT(1)
 133 #define TMP432_STATUS_REMOTE2                   BIT(2)
 134
 135 /* Manufacturer / Device ID's */
 136 #define TMP401_MANUFACTURER_ID                  0x55
 137 #define TMP401_DEVICE_ID                        0x11
 138 #define TMP411A_DEVICE_ID                       0x12
 139 #define TMP411B_DEVICE_ID                       0x13
 140 #define TMP411C_DEVICE_ID                       0x10
 141 #define TMP431_DEVICE_ID                        0x31
 142 #define TMP432_DEVICE_ID                        0x32
 143 #define TMP435_DEVICE_ID                        0x35
 144
 145 /*
 146  * Driver data (common to all clients)
 147  */
 148
 149 static const struct i2c_device_id tmp401_id[] = {
 150         { "tmp401", tmp401 },
 151         { "tmp411", tmp411 },
 152         { "tmp431", tmp431 },
 153         { "tmp432", tmp432 },
 154         { "tmp435", tmp435 },
 155         { "tmp461", tmp461 },
 156         { }
 157 };
 158 MODULE_DEVICE_TABLE(i2c, tmp401_id);
 159
 160 /*
 161  * Client data (each client gets its own)
 162  */
 163
 164 struct tmp401_data {
 165         struct i2c_client *client;
 166         const struct attribute_group *groups[3];
 167         struct mutex update_lock;
 168         char valid; /* zero until following fields are valid */
 169         unsigned long last_updated; /* in jiffies */
 170         enum chips kind;
 171
 172         unsigned int update_interval;   /* in milliseconds */
 173
 174         /* register values */
 175         u8 status[4];
 176         u8 config;
 177         u16 temp[7][3];
 178         u8 temp_crit_hyst;
 179 };
 180
 181 /*
 182  * Sysfs attr show / store functions
 183  */
 184
 185 static int tmp401_register_to_temp(u16 reg, u8 config)
 186 {
 187         int temp = reg;
 188
 189         if (config & TMP401_CONFIG_RANGE)
 190                 temp -= 64 * 256;
 191
 192         return DIV_ROUND_CLOSEST(temp * 125, 32);
 193 }
 194
 195 static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
 196 {
 197         if (config & TMP401_CONFIG_RANGE) {
 198                 temp = clamp_val(temp, -64000, 191000);
 199                 temp += 64000;
 200         } else
 201                 temp = clamp_val(temp, 0, 127000);
 202
 203         return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
 204 }
 205
 206 static int tmp401_update_device_reg16(struct i2c_client *client,
 207                                       struct tmp401_data *data)
 208 {
 209         int i, j, val;
 210         int num_regs = data->kind == tmp411 ? 6 : 4;
 211         int num_sensors = data->kind == tmp432 ? 3 : 2;
 212
 213         for (i = 0; i < num_sensors; i++) {             /* local / r1 / r2 */
 214                 for (j = 0; j < num_regs; j++) {        /* temp / low / ... */
 215                         u8 regaddr;
 216                         /*
 217                          * High byte must be read first immediately followed
 218                          * by the low byte
 219                          */
 220                         regaddr = data->kind == tmp432 ?
 221                                                 TMP432_TEMP_MSB_READ[j][i] :
 222                                                 TMP401_TEMP_MSB_READ[j][i];
 223                         val = i2c_smbus_read_byte_data(client, regaddr);
 224                         if (val < 0)
 225                                 return val;
 226                         data->temp[j][i] = val << 8;
 227                         if (j == 3)             /* crit is msb only */
 228                                 continue;
 229                         regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[j][i]
 230                                                        : TMP401_TEMP_LSB[j][i];
 231                         val = i2c_smbus_read_byte_data(client, regaddr);
 232                         if (val < 0)
 233                                 return val;
 234                         data->temp[j][i] |= val;
 235                 }
 236         }
 237         return 0;
 238 }
 239
 240 static struct tmp401_data *tmp401_update_device(struct device *dev)
 241 {
 242         struct tmp401_data *data = dev_get_drvdata(dev);
 243         struct i2c_client *client = data->client;
 244         struct tmp401_data *ret = data;
 245         int i, val;
 246         unsigned long next_update;
 247
 248         mutex_lock(&data->update_lock);
 249
 250         next_update = data->last_updated +
 251                       msecs_to_jiffies(data->update_interval);
 252         if (time_after(jiffies, next_update) || !data->valid) {
 253                 if (data->kind != tmp432) {
 254                         /*
 255                          * The driver uses the TMP432 status format internally.
 256                          * Convert status to TMP432 format for other chips.
 257                          */
 258                         val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
 259                         if (val < 0) {
 260                                 ret = ERR_PTR(val);
 261                                 goto abort;
 262                         }
 263                         data->status[0] =
 264                           (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
 265                         data->status[1] =
 266                           ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
 267                           ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
 268                         data->status[2] =
 269                           ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
 270                           ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
 271                         data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
 272                                                 | TMP401_STATUS_REMOTE_CRIT);
 273                 } else {
 274                         for (i = 0; i < ARRAY_SIZE(data->status); i++) {
 275                                 val = i2c_smbus_read_byte_data(client,
 276                                                         TMP432_STATUS_REG[i]);
 277                                 if (val < 0) {
 278                                         ret = ERR_PTR(val);
 279                                         goto abort;
 280                                 }
 281                                 data->status[i] = val;
 282                         }
 283                 }
 284
 285                 val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 286                 if (val < 0) {
 287                         ret = ERR_PTR(val);
 288                         goto abort;
 289                 }
 290                 data->config = val;
 291                 val = tmp401_update_device_reg16(client, data);
 292                 if (val < 0) {
 293                         ret = ERR_PTR(val);
 294                         goto abort;
 295                 }
 296                 val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
 297                 if (val < 0) {
 298                         ret = ERR_PTR(val);
 299                         goto abort;
 300                 }
 301                 data->temp_crit_hyst = val;
 302
 303                 data->last_updated = jiffies;
 304                 data->valid = 1;
 305         }
 306
 307 abort:
 308         mutex_unlock(&data->update_lock);
 309         return ret;
 310 }
 311
 312 static ssize_t show_temp(struct device *dev,
 313                          struct device_attribute *devattr, char *buf)
 314 {
 315         int nr = to_sensor_dev_attr_2(devattr)->nr;
 316         int index = to_sensor_dev_attr_2(devattr)->index;
 317         struct tmp401_data *data = tmp401_update_device(dev);
 318
 319         if (IS_ERR(data))
 320                 return PTR_ERR(data);
 321
 322         return sprintf(buf, "%d\n",
 323                 tmp401_register_to_temp(data->temp[nr][index], data->config));
 324 }
 325
 326 static ssize_t show_temp_crit_hyst(struct device *dev,
 327         struct device_attribute *devattr, char *buf)
 328 {
 329         int temp, index = to_sensor_dev_attr(devattr)->index;
 330         struct tmp401_data *data = tmp401_update_device(dev);
 331
 332         if (IS_ERR(data))
 333                 return PTR_ERR(data);
 334
 335         mutex_lock(&data->update_lock);
 336         temp = tmp401_register_to_temp(data->temp[3][index], data->config);
 337         temp -= data->temp_crit_hyst * 1000;
 338         mutex_unlock(&data->update_lock);
 339
 340         return sprintf(buf, "%d\n", temp);
 341 }
 342
 343 static ssize_t show_status(struct device *dev,
 344         struct device_attribute *devattr, char *buf)
 345 {
 346         int nr = to_sensor_dev_attr_2(devattr)->nr;
 347         int mask = to_sensor_dev_attr_2(devattr)->index;
 348         struct tmp401_data *data = tmp401_update_device(dev);
 349
 350         if (IS_ERR(data))
 351                 return PTR_ERR(data);
 352
 353         return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
 354 }
 355
 356 static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
 357                           const char *buf, size_t count)
 358 {
 359         int nr = to_sensor_dev_attr_2(devattr)->nr;
 360         int index = to_sensor_dev_attr_2(devattr)->index;
 361         struct tmp401_data *data = dev_get_drvdata(dev);
 362         struct i2c_client *client = data->client;
 363         long val;
 364         u16 reg;
 365         u8 regaddr;
 366
 367         if (kstrtol(buf, 10, &val))
 368                 return -EINVAL;
 369
 370         reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
 371
 372         mutex_lock(&data->update_lock);
 373
 374         regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
 375                                        : TMP401_TEMP_MSB_WRITE[nr][index];
 376         i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
 377         if (nr != 3) {
 378                 regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[nr][index]
 379                                                : TMP401_TEMP_LSB[nr][index];
 380                 i2c_smbus_write_byte_data(client, regaddr, reg & 0xFF);
 381         }
 382         data->temp[nr][index] = reg;
 383
 384         mutex_unlock(&data->update_lock);
 385
 386         return count;
 387 }
 388
 389 static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
 390         *devattr, const char *buf, size_t count)
 391 {
 392         int temp, index = to_sensor_dev_attr(devattr)->index;
 393         struct tmp401_data *data = tmp401_update_device(dev);
 394         long val;
 395         u8 reg;
 396
 397         if (IS_ERR(data))
 398                 return PTR_ERR(data);
 399
 400         if (kstrtol(buf, 10, &val))
 401                 return -EINVAL;
 402
 403         if (data->config & TMP401_CONFIG_RANGE)
 404                 val = clamp_val(val, -64000, 191000);
 405         else
 406                 val = clamp_val(val, 0, 127000);
 407
 408         mutex_lock(&data->update_lock);
 409         temp = tmp401_register_to_temp(data->temp[3][index], data->config);
 410         val = clamp_val(val, temp - 255000, temp);
 411         reg = ((temp - val) + 500) / 1000;
 412
 413         i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
 414                                   reg);
 415
 416         data->temp_crit_hyst = reg;
 417
 418         mutex_unlock(&data->update_lock);
 419
 420         return count;
 421 }
 422
 423 /*
 424  * Resets the historical measurements of minimum and maximum temperatures.
 425  * This is done by writing any value to any of the minimum/maximum registers
 426  * (0x30-0x37).
 427  */
 428 static ssize_t reset_temp_history(struct device *dev,
 429         struct device_attribute *devattr, const char *buf, size_t count)
 430 {
 431         struct tmp401_data *data = dev_get_drvdata(dev);
 432         struct i2c_client *client = data->client;
 433         long val;
 434
 435         if (kstrtol(buf, 10, &val))
 436                 return -EINVAL;
 437
 438         if (val != 1) {
 439                 dev_err(dev,
 440                         "temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
 441                         val);
 442                 return -EINVAL;
 443         }
 444         mutex_lock(&data->update_lock);
 445         i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
 446         data->valid = 0;
 447         mutex_unlock(&data->update_lock);
 448
 449         return count;
 450 }
 451
 452 static ssize_t show_update_interval(struct device *dev,
 453                                     struct device_attribute *attr, char *buf)
 454 {
 455         struct tmp401_data *data = dev_get_drvdata(dev);
 456
 457         return sprintf(buf, "%u\n", data->update_interval);
 458 }
 459
 460 static ssize_t set_update_interval(struct device *dev,
 461                                    struct device_attribute *attr,
 462                                    const char *buf, size_t count)
 463 {
 464         struct tmp401_data *data = dev_get_drvdata(dev);
 465         struct i2c_client *client = data->client;
 466         unsigned long val;
 467         int err, rate;
 468
 469         err = kstrtoul(buf, 10, &val);
 470         if (err)
 471                 return err;
 472
 473         /*
 474          * For valid rates, interval can be calculated as
 475          *      interval = (1 << (7 - rate)) * 125;
 476          * Rounded rate is therefore
 477          *      rate = 7 - __fls(interval * 4 / (125 * 3));
 478          * Use clamp_val() to avoid overflows, and to ensure valid input
 479          * for __fls.
 480          */
 481         val = clamp_val(val, 125, 16000);
 482         rate = 7 - __fls(val * 4 / (125 * 3));
 483         mutex_lock(&data->update_lock);
 484         i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
 485         data->update_interval = (1 << (7 - rate)) * 125;
 486         mutex_unlock(&data->update_lock);
 487
 488         return count;
 489 }
 490
 491 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
 492 static SENSOR_DEVICE_ATTR_2(temp1_min, S_IWUSR | S_IRUGO, show_temp,
 493                             store_temp, 1, 0);
 494 static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp,
 495                             store_temp, 2, 0);
 496 static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
 497                             store_temp, 3, 0);
 498 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
 499                           show_temp_crit_hyst, store_temp_crit_hyst, 0);
 500 static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_status, NULL,
 501                             1, TMP432_STATUS_LOCAL);
 502 static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_status, NULL,
 503                             2, TMP432_STATUS_LOCAL);
 504 static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_status, NULL,
 505                             3, TMP432_STATUS_LOCAL);
 506 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
 507 static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp,
 508                             store_temp, 1, 1);
 509 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp,
 510                             store_temp, 2, 1);
 511 static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IWUSR | S_IRUGO, show_temp,
 512                             store_temp, 3, 1);
 513 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst,
 514                           NULL, 1);
 515 static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_status, NULL,
 516                             0, TMP432_STATUS_REMOTE1);
 517 static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_status, NULL,
 518                             1, TMP432_STATUS_REMOTE1);
 519 static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_status, NULL,
 520                             2, TMP432_STATUS_REMOTE1);
 521 static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_status, NULL,
 522                             3, TMP432_STATUS_REMOTE1);
 523
 524 static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
 525                    set_update_interval);
 526
 527 static struct attribute *tmp401_attributes[] = {
 528         &sensor_dev_attr_temp1_input.dev_attr.attr,
 529         &sensor_dev_attr_temp1_min.dev_attr.attr,
 530         &sensor_dev_attr_temp1_max.dev_attr.attr,
 531         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 532         &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
 533         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 534         &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 535         &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
 536
 537         &sensor_dev_attr_temp2_input.dev_attr.attr,
 538         &sensor_dev_attr_temp2_min.dev_attr.attr,
 539         &sensor_dev_attr_temp2_max.dev_attr.attr,
 540         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 541         &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
 542         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 543         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 544         &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 545         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 546
 547         &dev_attr_update_interval.attr,
 548
 549         NULL
 550 };
 551
 552 static const struct attribute_group tmp401_group = {
 553         .attrs = tmp401_attributes,
 554 };
 555
 556 /*
 557  * Additional features of the TMP411 chip.
 558  * The TMP411 stores the minimum and maximum
 559  * temperature measured since power-on, chip-reset, or
 560  * minimum and maximum register reset for both the local
 561  * and remote channels.
 562  */
 563 static SENSOR_DEVICE_ATTR_2(temp1_lowest, S_IRUGO, show_temp, NULL, 4, 0);
 564 static SENSOR_DEVICE_ATTR_2(temp1_highest, S_IRUGO, show_temp, NULL, 5, 0);
 565 static SENSOR_DEVICE_ATTR_2(temp2_lowest, S_IRUGO, show_temp, NULL, 4, 1);
 566 static SENSOR_DEVICE_ATTR_2(temp2_highest, S_IRUGO, show_temp, NULL, 5, 1);
 567 static SENSOR_DEVICE_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history,
 568                           0);
 569
 570 static struct attribute *tmp411_attributes[] = {
 571         &sensor_dev_attr_temp1_highest.dev_attr.attr,
 572         &sensor_dev_attr_temp1_lowest.dev_attr.attr,
 573         &sensor_dev_attr_temp2_highest.dev_attr.attr,
 574         &sensor_dev_attr_temp2_lowest.dev_attr.attr,
 575         &sensor_dev_attr_temp_reset_history.dev_attr.attr,
 576         NULL
 577 };
 578
 579 static const struct attribute_group tmp411_group = {
 580         .attrs = tmp411_attributes,
 581 };
 582
 583 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0, 2);
 584 static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp,
 585                             store_temp, 1, 2);
 586 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp,
 587                             store_temp, 2, 2);
 588 static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
 589                             store_temp, 3, 2);
 590 static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temp_crit_hyst,
 591                           NULL, 2);
 592 static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_status, NULL,
 593                             0, TMP432_STATUS_REMOTE2);
 594 static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_status, NULL,
 595                             1, TMP432_STATUS_REMOTE2);
 596 static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_status, NULL,
 597                             2, TMP432_STATUS_REMOTE2);
 598 static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_status, NULL,
 599                             3, TMP432_STATUS_REMOTE2);
 600
 601 static struct attribute *tmp432_attributes[] = {
 602         &sensor_dev_attr_temp3_input.dev_attr.attr,
 603         &sensor_dev_attr_temp3_min.dev_attr.attr,
 604         &sensor_dev_attr_temp3_max.dev_attr.attr,
 605         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 606         &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
 607         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 608         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 609         &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
 610         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 611
 612         NULL
 613 };
 614
 615 static const struct attribute_group tmp432_group = {
 616         .attrs = tmp432_attributes,
 617 };
 618
 619 /*
 620  * Additional features of the TMP461 chip.
 621  * The TMP461 temperature offset for the remote channel.
 622  */
 623 static SENSOR_DEVICE_ATTR_2(temp2_offset, S_IWUSR | S_IRUGO, show_temp,
 624                             store_temp, 6, 1);
 625
 626 static struct attribute *tmp461_attributes[] = {
 627         &sensor_dev_attr_temp2_offset.dev_attr.attr,
 628         NULL
 629 };
 630
 631 static const struct attribute_group tmp461_group = {
 632         .attrs = tmp461_attributes,
 633 };
 634
 635 /*
 636  * Begin non sysfs callback code (aka Real code)
 637  */
 638
 639 static int tmp401_init_client(struct tmp401_data *data,
 640                               struct i2c_client *client)
 641 {
 642         int config, config_orig, status = 0;
 643
 644         /* Set the conversion rate to 2 Hz */
 645         i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
 646         data->update_interval = 500;
 647
 648         /* Start conversions (disable shutdown if necessary) */
 649         config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 650         if (config < 0)
 651                 return config;
 652
 653         config_orig = config;
 654         config &= ~TMP401_CONFIG_SHUTDOWN;
 655
 656         if (config != config_orig)
 657                 status = i2c_smbus_write_byte_data(client,
 658                                                    TMP401_CONFIG_WRITE,
 659                                                    config);
 660
 661         return status;
 662 }
 663
 664 static int tmp401_detect(struct i2c_client *client,
 665                          struct i2c_board_info *info)
 666 {
 667         enum chips kind;
 668         struct i2c_adapter *adapter = client->adapter;
 669         u8 reg;
 670
 671         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 672                 return -ENODEV;
 673
 674         /* Detect and identify the chip */
 675         reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
 676         if (reg != TMP401_MANUFACTURER_ID)
 677                 return -ENODEV;
 678
 679         reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
 680
 681         switch (reg) {
 682         case TMP401_DEVICE_ID:
 683                 if (client->addr != 0x4c)
 684                         return -ENODEV;
 685                 kind = tmp401;
 686                 break;
 687         case TMP411A_DEVICE_ID:
 688                 if (client->addr != 0x4c)
 689                         return -ENODEV;
 690                 kind = tmp411;
 691                 break;
 692         case TMP411B_DEVICE_ID:
 693                 if (client->addr != 0x4d)
 694                         return -ENODEV;
 695                 kind = tmp411;
 696                 break;
 697         case TMP411C_DEVICE_ID:
 698                 if (client->addr != 0x4e)
 699                         return -ENODEV;
 700                 kind = tmp411;
 701                 break;
 702         case TMP431_DEVICE_ID:
 703                 if (client->addr != 0x4c && client->addr != 0x4d)
 704                         return -ENODEV;
 705                 kind = tmp431;
 706                 break;
 707         case TMP432_DEVICE_ID:
 708                 if (client->addr != 0x4c && client->addr != 0x4d)
 709                         return -ENODEV;
 710                 kind = tmp432;
 711                 break;
 712         case TMP435_DEVICE_ID:
 713                 kind = tmp435;
 714                 break;
 715         default:
 716                 return -ENODEV;
 717         }
 718
 719         reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
 720         if (reg & 0x1b)
 721                 return -ENODEV;
 722
 723         reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
 724         /* Datasheet says: 0x1-0x6 */
 725         if (reg > 15)
 726                 return -ENODEV;
 727
 728         strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
 729
 730         return 0;
 731 }
 732
 733 static int tmp401_probe(struct i2c_client *client,
 734                         const struct i2c_device_id *id)
 735 {
 736         static const char * const names[] = {
 737                 "TMP401", "TMP411", "TMP431", "TMP432", "TMP435", "TMP461"
 738         };
 739         struct device *dev = &client->dev;
 740         struct device *hwmon_dev;
 741         struct tmp401_data *data;
 742         int groups = 0, status;
 743
 744         data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
 745         if (!data)
 746                 return -ENOMEM;
 747
 748         data->client = client;
 749         mutex_init(&data->update_lock);
 750         data->kind = id->driver_data;
 751
 752         /* Initialize the TMP401 chip */
 753         status = tmp401_init_client(data, client);
 754         if (status < 0)
 755                 return status;
 756
 757         /* Register sysfs hooks */
 758         data->groups[groups++] = &tmp401_group;
 759
 760         /* Register additional tmp411 sysfs hooks */
 761         if (data->kind == tmp411)
 762                 data->groups[groups++] = &tmp411_group;
 763
 764         /* Register additional tmp432 sysfs hooks */
 765         if (data->kind == tmp432)
 766                 data->groups[groups++] = &tmp432_group;
 767
 768         if (data->kind == tmp461)
 769                 data->groups[groups++] = &tmp461_group;
 770
 771         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 772                                                            data, data->groups);
 773         if (IS_ERR(hwmon_dev))
 774                 return PTR_ERR(hwmon_dev);
 775
 776         dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
 777
 778         return 0;
 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         .id_table       = tmp401_id,
 788         .detect         = tmp401_detect,
 789         .address_list   = normal_i2c,
 790 };
 791
 792 module_i2c_driver(tmp401_driver);
 793
 794 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 795 MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
 796 MODULE_LICENSE("GPL");