drivers/hwmon/lm95234.c

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This source file includes following definitions.
lm95234_read_temp
lm95234_fill_cache
lm95234_update_device
temp_show
alarm_show
type_show
type_store
tcrit2_show
tcrit2_store
tcrit2_hyst_show
tcrit1_show
tcrit1_store
tcrit1_hyst_show
tcrit1_hyst_store
offset_show
offset_store
update_interval_show
update_interval_store
lm95234_detect
lm95234_init_client
lm95234_probe
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Driver for Texas Instruments / National Semiconductor LM95234
   4  *
   5  * Copyright (c) 2013, 2014 Guenter Roeck <linux@roeck-us.net>
   6  *
   7  * Derived from lm95241.c
   8  * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
   9  */
  10 
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/slab.h>
  14 #include <linux/jiffies.h>
  15 #include <linux/i2c.h>
  16 #include <linux/hwmon.h>
  17 #include <linux/hwmon-sysfs.h>
  18 #include <linux/err.h>
  19 #include <linux/mutex.h>
  20 #include <linux/sysfs.h>
  21 
  22 #define DRVNAME "lm95234"
  23 
  24 enum chips { lm95233, lm95234 };
  25 
  26 static const unsigned short normal_i2c[] = {
  27         0x18, 0x2a, 0x2b, 0x4d, 0x4e, I2C_CLIENT_END };
  28 
  29 /* LM95234 registers */
  30 #define LM95234_REG_MAN_ID              0xFE
  31 #define LM95234_REG_CHIP_ID             0xFF
  32 #define LM95234_REG_STATUS              0x02
  33 #define LM95234_REG_CONFIG              0x03
  34 #define LM95234_REG_CONVRATE            0x04
  35 #define LM95234_REG_STS_FAULT           0x07
  36 #define LM95234_REG_STS_TCRIT1          0x08
  37 #define LM95234_REG_STS_TCRIT2          0x09
  38 #define LM95234_REG_TEMPH(x)            ((x) + 0x10)
  39 #define LM95234_REG_TEMPL(x)            ((x) + 0x20)
  40 #define LM95234_REG_UTEMPH(x)           ((x) + 0x19)    /* Remote only */
  41 #define LM95234_REG_UTEMPL(x)           ((x) + 0x29)
  42 #define LM95234_REG_REM_MODEL           0x30
  43 #define LM95234_REG_REM_MODEL_STS       0x38
  44 #define LM95234_REG_OFFSET(x)           ((x) + 0x31)    /* Remote only */
  45 #define LM95234_REG_TCRIT1(x)           ((x) + 0x40)
  46 #define LM95234_REG_TCRIT2(x)           ((x) + 0x49)    /* Remote channel 1,2 */
  47 #define LM95234_REG_TCRIT_HYST          0x5a
  48 
  49 #define NATSEMI_MAN_ID                  0x01
  50 #define LM95233_CHIP_ID                 0x89
  51 #define LM95234_CHIP_ID                 0x79
  52 
  53 /* Client data (each client gets its own) */
  54 struct lm95234_data {
  55         struct i2c_client *client;
  56         const struct attribute_group *groups[3];
  57         struct mutex update_lock;
  58         unsigned long last_updated, interval;   /* in jiffies */
  59         bool valid;             /* false until following fields are valid */
  60         /* registers values */
  61         int temp[5];            /* temperature (signed) */
  62         u32 status;             /* fault/alarm status */
  63         u8 tcrit1[5];           /* critical temperature limit */
  64         u8 tcrit2[2];           /* high temperature limit */
  65         s8 toffset[4];          /* remote temperature offset */
  66         u8 thyst;               /* common hysteresis */
  67 
  68         u8 sensor_type;         /* temperature sensor type */
  69 };
  70 
  71 static int lm95234_read_temp(struct i2c_client *client, int index, int *t)
  72 {
  73         int val;
  74         u16 temp = 0;
  75 
  76         if (index) {
  77                 val = i2c_smbus_read_byte_data(client,
  78                                                LM95234_REG_UTEMPH(index - 1));
  79                 if (val < 0)
  80                         return val;
  81                 temp = val << 8;
  82                 val = i2c_smbus_read_byte_data(client,
  83                                                LM95234_REG_UTEMPL(index - 1));
  84                 if (val < 0)
  85                         return val;
  86                 temp |= val;
  87                 *t = temp;
  88         }
  89         /*
  90          * Read signed temperature if unsigned temperature is 0,
  91          * or if this is the local sensor.
  92          */
  93         if (!temp) {
  94                 val = i2c_smbus_read_byte_data(client,
  95                                                LM95234_REG_TEMPH(index));
  96                 if (val < 0)
  97                         return val;
  98                 temp = val << 8;
  99                 val = i2c_smbus_read_byte_data(client,
 100                                                LM95234_REG_TEMPL(index));
 101                 if (val < 0)
 102                         return val;
 103                 temp |= val;
 104                 *t = (s16)temp;
 105         }
 106         return 0;
 107 }
 108 
 109 static u16 update_intervals[] = { 143, 364, 1000, 2500 };
 110 
 111 /* Fill value cache. Must be called with update lock held. */
 112 
 113 static int lm95234_fill_cache(struct lm95234_data *data,
 114                               struct i2c_client *client)
 115 {
 116         int i, ret;
 117 
 118         ret = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);
 119         if (ret < 0)
 120                 return ret;
 121 
 122         data->interval = msecs_to_jiffies(update_intervals[ret & 0x03]);
 123 
 124         for (i = 0; i < ARRAY_SIZE(data->tcrit1); i++) {
 125                 ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT1(i));
 126                 if (ret < 0)
 127                         return ret;
 128                 data->tcrit1[i] = ret;
 129         }
 130         for (i = 0; i < ARRAY_SIZE(data->tcrit2); i++) {
 131                 ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT2(i));
 132                 if (ret < 0)
 133                         return ret;
 134                 data->tcrit2[i] = ret;
 135         }
 136         for (i = 0; i < ARRAY_SIZE(data->toffset); i++) {
 137                 ret = i2c_smbus_read_byte_data(client, LM95234_REG_OFFSET(i));
 138                 if (ret < 0)
 139                         return ret;
 140                 data->toffset[i] = ret;
 141         }
 142 
 143         ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT_HYST);
 144         if (ret < 0)
 145                 return ret;
 146         data->thyst = ret;
 147 
 148         ret = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
 149         if (ret < 0)
 150                 return ret;
 151         data->sensor_type = ret;
 152 
 153         return 0;
 154 }
 155 
 156 static int lm95234_update_device(struct lm95234_data *data)
 157 {
 158         struct i2c_client *client = data->client;
 159         int ret;
 160 
 161         mutex_lock(&data->update_lock);
 162 
 163         if (time_after(jiffies, data->last_updated + data->interval) ||
 164             !data->valid) {
 165                 int i;
 166 
 167                 if (!data->valid) {
 168                         ret = lm95234_fill_cache(data, client);
 169                         if (ret < 0)
 170                                 goto abort;
 171                 }
 172 
 173                 data->valid = false;
 174                 for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
 175                         ret = lm95234_read_temp(client, i, &data->temp[i]);
 176                         if (ret < 0)
 177                                 goto abort;
 178                 }
 179 
 180                 ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_FAULT);
 181                 if (ret < 0)
 182                         goto abort;
 183                 data->status = ret;
 184 
 185                 ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT1);
 186                 if (ret < 0)
 187                         goto abort;
 188                 data->status |= ret << 8;
 189 
 190                 ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT2);
 191                 if (ret < 0)
 192                         goto abort;
 193                 data->status |= ret << 16;
 194 
 195                 data->last_updated = jiffies;
 196                 data->valid = true;
 197         }
 198         ret = 0;
 199 abort:
 200         mutex_unlock(&data->update_lock);
 201 
 202         return ret;
 203 }
 204 
 205 static ssize_t temp_show(struct device *dev, struct device_attribute *attr,
 206                          char *buf)
 207 {
 208         struct lm95234_data *data = dev_get_drvdata(dev);
 209         int index = to_sensor_dev_attr(attr)->index;
 210         int ret = lm95234_update_device(data);
 211 
 212         if (ret)
 213                 return ret;
 214 
 215         return sprintf(buf, "%d\n",
 216                        DIV_ROUND_CLOSEST(data->temp[index] * 125, 32));
 217 }
 218 
 219 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
 220                           char *buf)
 221 {
 222         struct lm95234_data *data = dev_get_drvdata(dev);
 223         u32 mask = to_sensor_dev_attr(attr)->index;
 224         int ret = lm95234_update_device(data);
 225 
 226         if (ret)
 227                 return ret;
 228 
 229         return sprintf(buf, "%u", !!(data->status & mask));
 230 }
 231 
 232 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 233                          char *buf)
 234 {
 235         struct lm95234_data *data = dev_get_drvdata(dev);
 236         u8 mask = to_sensor_dev_attr(attr)->index;
 237         int ret = lm95234_update_device(data);
 238 
 239         if (ret)
 240                 return ret;
 241 
 242         return sprintf(buf, data->sensor_type & mask ? "1\n" : "2\n");
 243 }
 244 
 245 static ssize_t type_store(struct device *dev, struct device_attribute *attr,
 246                           const char *buf, size_t count)
 247 {
 248         struct lm95234_data *data = dev_get_drvdata(dev);
 249         unsigned long val;
 250         u8 mask = to_sensor_dev_attr(attr)->index;
 251         int ret = lm95234_update_device(data);
 252 
 253         if (ret)
 254                 return ret;
 255 
 256         ret = kstrtoul(buf, 10, &val);
 257         if (ret < 0)
 258                 return ret;
 259 
 260         if (val != 1 && val != 2)
 261                 return -EINVAL;
 262 
 263         mutex_lock(&data->update_lock);
 264         if (val == 1)
 265                 data->sensor_type |= mask;
 266         else
 267                 data->sensor_type &= ~mask;
 268         data->valid = false;
 269         i2c_smbus_write_byte_data(data->client, LM95234_REG_REM_MODEL,
 270                                   data->sensor_type);
 271         mutex_unlock(&data->update_lock);
 272 
 273         return count;
 274 }
 275 
 276 static ssize_t tcrit2_show(struct device *dev, struct device_attribute *attr,
 277                            char *buf)
 278 {
 279         struct lm95234_data *data = dev_get_drvdata(dev);
 280         int index = to_sensor_dev_attr(attr)->index;
 281         int ret = lm95234_update_device(data);
 282 
 283         if (ret)
 284                 return ret;
 285 
 286         return sprintf(buf, "%u", data->tcrit2[index] * 1000);
 287 }
 288 
 289 static ssize_t tcrit2_store(struct device *dev, struct device_attribute *attr,
 290                             const char *buf, size_t count)
 291 {
 292         struct lm95234_data *data = dev_get_drvdata(dev);
 293         int index = to_sensor_dev_attr(attr)->index;
 294         long val;
 295         int ret = lm95234_update_device(data);
 296 
 297         if (ret)
 298                 return ret;
 299 
 300         ret = kstrtol(buf, 10, &val);
 301         if (ret < 0)
 302                 return ret;
 303 
 304         val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, index ? 255 : 127);
 305 
 306         mutex_lock(&data->update_lock);
 307         data->tcrit2[index] = val;
 308         i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT2(index), val);
 309         mutex_unlock(&data->update_lock);
 310 
 311         return count;
 312 }
 313 
 314 static ssize_t tcrit2_hyst_show(struct device *dev,
 315                                 struct device_attribute *attr, char *buf)
 316 {
 317         struct lm95234_data *data = dev_get_drvdata(dev);
 318         int index = to_sensor_dev_attr(attr)->index;
 319         int ret = lm95234_update_device(data);
 320 
 321         if (ret)
 322                 return ret;
 323 
 324         /* Result can be negative, so be careful with unsigned operands */
 325         return sprintf(buf, "%d",
 326                        ((int)data->tcrit2[index] - (int)data->thyst) * 1000);
 327 }
 328 
 329 static ssize_t tcrit1_show(struct device *dev, struct device_attribute *attr,
 330                            char *buf)
 331 {
 332         struct lm95234_data *data = dev_get_drvdata(dev);
 333         int index = to_sensor_dev_attr(attr)->index;
 334 
 335         return sprintf(buf, "%u", data->tcrit1[index] * 1000);
 336 }
 337 
 338 static ssize_t tcrit1_store(struct device *dev, struct device_attribute *attr,
 339                             const char *buf, size_t count)
 340 {
 341         struct lm95234_data *data = dev_get_drvdata(dev);
 342         int index = to_sensor_dev_attr(attr)->index;
 343         int ret = lm95234_update_device(data);
 344         long val;
 345 
 346         if (ret)
 347                 return ret;
 348 
 349         ret = kstrtol(buf, 10, &val);
 350         if (ret < 0)
 351                 return ret;
 352 
 353         val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 255);
 354 
 355         mutex_lock(&data->update_lock);
 356         data->tcrit1[index] = val;
 357         i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT1(index), val);
 358         mutex_unlock(&data->update_lock);
 359 
 360         return count;
 361 }
 362 
 363 static ssize_t tcrit1_hyst_show(struct device *dev,
 364                                 struct device_attribute *attr, char *buf)
 365 {
 366         struct lm95234_data *data = dev_get_drvdata(dev);
 367         int index = to_sensor_dev_attr(attr)->index;
 368         int ret = lm95234_update_device(data);
 369 
 370         if (ret)
 371                 return ret;
 372 
 373         /* Result can be negative, so be careful with unsigned operands */
 374         return sprintf(buf, "%d",
 375                        ((int)data->tcrit1[index] - (int)data->thyst) * 1000);
 376 }
 377 
 378 static ssize_t tcrit1_hyst_store(struct device *dev,
 379                                  struct device_attribute *attr,
 380                                  const char *buf, size_t count)
 381 {
 382         struct lm95234_data *data = dev_get_drvdata(dev);
 383         int index = to_sensor_dev_attr(attr)->index;
 384         int ret = lm95234_update_device(data);
 385         long val;
 386 
 387         if (ret)
 388                 return ret;
 389 
 390         ret = kstrtol(buf, 10, &val);
 391         if (ret < 0)
 392                 return ret;
 393 
 394         val = DIV_ROUND_CLOSEST(val, 1000);
 395         val = clamp_val((int)data->tcrit1[index] - val, 0, 31);
 396 
 397         mutex_lock(&data->update_lock);
 398         data->thyst = val;
 399         i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT_HYST, val);
 400         mutex_unlock(&data->update_lock);
 401 
 402         return count;
 403 }
 404 
 405 static ssize_t offset_show(struct device *dev, struct device_attribute *attr,
 406                            char *buf)
 407 {
 408         struct lm95234_data *data = dev_get_drvdata(dev);
 409         int index = to_sensor_dev_attr(attr)->index;
 410         int ret = lm95234_update_device(data);
 411 
 412         if (ret)
 413                 return ret;
 414 
 415         return sprintf(buf, "%d", data->toffset[index] * 500);
 416 }
 417 
 418 static ssize_t offset_store(struct device *dev, struct device_attribute *attr,
 419                             const char *buf, size_t count)
 420 {
 421         struct lm95234_data *data = dev_get_drvdata(dev);
 422         int index = to_sensor_dev_attr(attr)->index;
 423         int ret = lm95234_update_device(data);
 424         long val;
 425 
 426         if (ret)
 427                 return ret;
 428 
 429         ret = kstrtol(buf, 10, &val);
 430         if (ret < 0)
 431                 return ret;
 432 
 433         /* Accuracy is 1/2 degrees C */
 434         val = clamp_val(DIV_ROUND_CLOSEST(val, 500), -128, 127);
 435 
 436         mutex_lock(&data->update_lock);
 437         data->toffset[index] = val;
 438         i2c_smbus_write_byte_data(data->client, LM95234_REG_OFFSET(index), val);
 439         mutex_unlock(&data->update_lock);
 440 
 441         return count;
 442 }
 443 
 444 static ssize_t update_interval_show(struct device *dev,
 445                                     struct device_attribute *attr, char *buf)
 446 {
 447         struct lm95234_data *data = dev_get_drvdata(dev);
 448         int ret = lm95234_update_device(data);
 449 
 450         if (ret)
 451                 return ret;
 452 
 453         return sprintf(buf, "%lu\n",
 454                        DIV_ROUND_CLOSEST(data->interval * 1000, HZ));
 455 }
 456 
 457 static ssize_t update_interval_store(struct device *dev,
 458                                      struct device_attribute *attr,
 459                                      const char *buf, size_t count)
 460 {
 461         struct lm95234_data *data = dev_get_drvdata(dev);
 462         int ret = lm95234_update_device(data);
 463         unsigned long val;
 464         u8 regval;
 465 
 466         if (ret)
 467                 return ret;
 468 
 469         ret = kstrtoul(buf, 10, &val);
 470         if (ret < 0)
 471                 return ret;
 472 
 473         for (regval = 0; regval < 3; regval++) {
 474                 if (val <= update_intervals[regval])
 475                         break;
 476         }
 477 
 478         mutex_lock(&data->update_lock);
 479         data->interval = msecs_to_jiffies(update_intervals[regval]);
 480         i2c_smbus_write_byte_data(data->client, LM95234_REG_CONVRATE, regval);
 481         mutex_unlock(&data->update_lock);
 482 
 483         return count;
 484 }
 485 
 486 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
 487 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
 488 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
 489 static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
 490 static SENSOR_DEVICE_ATTR_RO(temp5_input, temp, 4);
 491 
 492 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, BIT(0) | BIT(1));
 493 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, BIT(2) | BIT(3));
 494 static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, BIT(4) | BIT(5));
 495 static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, BIT(6) | BIT(7));
 496 
 497 static SENSOR_DEVICE_ATTR_RW(temp2_type, type, BIT(1));
 498 static SENSOR_DEVICE_ATTR_RW(temp3_type, type, BIT(2));
 499 static SENSOR_DEVICE_ATTR_RW(temp4_type, type, BIT(3));
 500 static SENSOR_DEVICE_ATTR_RW(temp5_type, type, BIT(4));
 501 
 502 static SENSOR_DEVICE_ATTR_RW(temp1_max, tcrit1, 0);
 503 static SENSOR_DEVICE_ATTR_RW(temp2_max, tcrit2, 0);
 504 static SENSOR_DEVICE_ATTR_RW(temp3_max, tcrit2, 1);
 505 static SENSOR_DEVICE_ATTR_RW(temp4_max, tcrit1, 3);
 506 static SENSOR_DEVICE_ATTR_RW(temp5_max, tcrit1, 4);
 507 
 508 static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, tcrit1_hyst, 0);
 509 static SENSOR_DEVICE_ATTR_RO(temp2_max_hyst, tcrit2_hyst, 0);
 510 static SENSOR_DEVICE_ATTR_RO(temp3_max_hyst, tcrit2_hyst, 1);
 511 static SENSOR_DEVICE_ATTR_RO(temp4_max_hyst, tcrit1_hyst, 3);
 512 static SENSOR_DEVICE_ATTR_RO(temp5_max_hyst, tcrit1_hyst, 4);
 513 
 514 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, BIT(0 + 8));
 515 static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, BIT(1 + 16));
 516 static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, BIT(2 + 16));
 517 static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, BIT(3 + 8));
 518 static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, BIT(4 + 8));
 519 
 520 static SENSOR_DEVICE_ATTR_RW(temp2_crit, tcrit1, 1);
 521 static SENSOR_DEVICE_ATTR_RW(temp3_crit, tcrit1, 2);
 522 
 523 static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, tcrit1_hyst, 1);
 524 static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, tcrit1_hyst, 2);
 525 
 526 static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, BIT(1 + 8));
 527 static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, BIT(2 + 8));
 528 
 529 static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 0);
 530 static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 1);
 531 static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 2);
 532 static SENSOR_DEVICE_ATTR_RW(temp5_offset, offset, 3);
 533 
 534 static DEVICE_ATTR_RW(update_interval);
 535 
 536 static struct attribute *lm95234_common_attrs[] = {
 537         &sensor_dev_attr_temp1_input.dev_attr.attr,
 538         &sensor_dev_attr_temp2_input.dev_attr.attr,
 539         &sensor_dev_attr_temp3_input.dev_attr.attr,
 540         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 541         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 542         &sensor_dev_attr_temp2_type.dev_attr.attr,
 543         &sensor_dev_attr_temp3_type.dev_attr.attr,
 544         &sensor_dev_attr_temp1_max.dev_attr.attr,
 545         &sensor_dev_attr_temp2_max.dev_attr.attr,
 546         &sensor_dev_attr_temp3_max.dev_attr.attr,
 547         &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 548         &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 549         &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
 550         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 551         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 552         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 553         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 554         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 555         &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
 556         &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
 557         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 558         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 559         &sensor_dev_attr_temp2_offset.dev_attr.attr,
 560         &sensor_dev_attr_temp3_offset.dev_attr.attr,
 561         &dev_attr_update_interval.attr,
 562         NULL
 563 };
 564 
 565 static const struct attribute_group lm95234_common_group = {
 566         .attrs = lm95234_common_attrs,
 567 };
 568 
 569 static struct attribute *lm95234_attrs[] = {
 570         &sensor_dev_attr_temp4_input.dev_attr.attr,
 571         &sensor_dev_attr_temp5_input.dev_attr.attr,
 572         &sensor_dev_attr_temp4_fault.dev_attr.attr,
 573         &sensor_dev_attr_temp5_fault.dev_attr.attr,
 574         &sensor_dev_attr_temp4_type.dev_attr.attr,
 575         &sensor_dev_attr_temp5_type.dev_attr.attr,
 576         &sensor_dev_attr_temp4_max.dev_attr.attr,
 577         &sensor_dev_attr_temp5_max.dev_attr.attr,
 578         &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
 579         &sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
 580         &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 581         &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
 582         &sensor_dev_attr_temp4_offset.dev_attr.attr,
 583         &sensor_dev_attr_temp5_offset.dev_attr.attr,
 584         NULL
 585 };
 586 
 587 static const struct attribute_group lm95234_group = {
 588         .attrs = lm95234_attrs,
 589 };
 590 
 591 static int lm95234_detect(struct i2c_client *client,
 592                           struct i2c_board_info *info)
 593 {
 594         struct i2c_adapter *adapter = client->adapter;
 595         int address = client->addr;
 596         u8 config_mask, model_mask;
 597         int mfg_id, chip_id, val;
 598         const char *name;
 599 
 600         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 601                 return -ENODEV;
 602 
 603         mfg_id = i2c_smbus_read_byte_data(client, LM95234_REG_MAN_ID);
 604         if (mfg_id != NATSEMI_MAN_ID)
 605                 return -ENODEV;
 606 
 607         chip_id = i2c_smbus_read_byte_data(client, LM95234_REG_CHIP_ID);
 608         switch (chip_id) {
 609         case LM95233_CHIP_ID:
 610                 if (address != 0x18 && address != 0x2a && address != 0x2b)
 611                         return -ENODEV;
 612                 config_mask = 0xbf;
 613                 model_mask = 0xf9;
 614                 name = "lm95233";
 615                 break;
 616         case LM95234_CHIP_ID:
 617                 if (address != 0x18 && address != 0x4d && address != 0x4e)
 618                         return -ENODEV;
 619                 config_mask = 0xbc;
 620                 model_mask = 0xe1;
 621                 name = "lm95234";
 622                 break;
 623         default:
 624                 return -ENODEV;
 625         }
 626 
 627         val = i2c_smbus_read_byte_data(client, LM95234_REG_STATUS);
 628         if (val & 0x30)
 629                 return -ENODEV;
 630 
 631         val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
 632         if (val & config_mask)
 633                 return -ENODEV;
 634 
 635         val = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);
 636         if (val & 0xfc)
 637                 return -ENODEV;
 638 
 639         val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
 640         if (val & model_mask)
 641                 return -ENODEV;
 642 
 643         val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
 644         if (val & model_mask)
 645                 return -ENODEV;
 646 
 647         strlcpy(info->type, name, I2C_NAME_SIZE);
 648         return 0;
 649 }
 650 
 651 static int lm95234_init_client(struct i2c_client *client)
 652 {
 653         int val, model;
 654 
 655         /* start conversion if necessary */
 656         val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
 657         if (val < 0)
 658                 return val;
 659         if (val & 0x40)
 660                 i2c_smbus_write_byte_data(client, LM95234_REG_CONFIG,
 661                                           val & ~0x40);
 662 
 663         /* If diode type status reports an error, try to fix it */
 664         val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
 665         if (val < 0)
 666                 return val;
 667         model = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
 668         if (model < 0)
 669                 return model;
 670         if (model & val) {
 671                 dev_notice(&client->dev,
 672                            "Fixing remote diode type misconfiguration (0x%x)\n",
 673                            val);
 674                 i2c_smbus_write_byte_data(client, LM95234_REG_REM_MODEL,
 675                                           model & ~val);
 676         }
 677         return 0;
 678 }
 679 
 680 static int lm95234_probe(struct i2c_client *client,
 681                          const struct i2c_device_id *id)
 682 {
 683         struct device *dev = &client->dev;
 684         struct lm95234_data *data;
 685         struct device *hwmon_dev;
 686         int err;
 687 
 688         data = devm_kzalloc(dev, sizeof(struct lm95234_data), GFP_KERNEL);
 689         if (!data)
 690                 return -ENOMEM;
 691 
 692         data->client = client;
 693         mutex_init(&data->update_lock);
 694 
 695         /* Initialize the LM95234 chip */
 696         err = lm95234_init_client(client);
 697         if (err < 0)
 698                 return err;
 699 
 700         data->groups[0] = &lm95234_common_group;
 701         if (id->driver_data == lm95234)
 702                 data->groups[1] = &lm95234_group;
 703 
 704         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 705                                                            data, data->groups);
 706         return PTR_ERR_OR_ZERO(hwmon_dev);
 707 }
 708 
 709 /* Driver data (common to all clients) */
 710 static const struct i2c_device_id lm95234_id[] = {
 711         { "lm95233", lm95233 },
 712         { "lm95234", lm95234 },
 713         { }
 714 };
 715 MODULE_DEVICE_TABLE(i2c, lm95234_id);
 716 
 717 static struct i2c_driver lm95234_driver = {
 718         .class          = I2C_CLASS_HWMON,
 719         .driver = {
 720                 .name   = DRVNAME,
 721         },
 722         .probe          = lm95234_probe,
 723         .id_table       = lm95234_id,
 724         .detect         = lm95234_detect,
 725         .address_list   = normal_i2c,
 726 };
 727 
 728 module_i2c_driver(lm95234_driver);
 729 
 730 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 731 MODULE_DESCRIPTION("LM95233/LM95234 sensor driver");
 732 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/hwmon/lm95234.c

DEFINITIONS
