1/* 2 * Driver for Texas Instruments / National Semiconductor LM95234 3 * 4 * Copyright (c) 2013, 2014 Guenter Roeck <linux@roeck-us.net> 5 * 6 * Derived from lm95241.c 7 * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 */ 19 20#include <linux/module.h> 21#include <linux/init.h> 22#include <linux/slab.h> 23#include <linux/jiffies.h> 24#include <linux/i2c.h> 25#include <linux/hwmon.h> 26#include <linux/hwmon-sysfs.h> 27#include <linux/err.h> 28#include <linux/mutex.h> 29#include <linux/sysfs.h> 30 31#define DRVNAME "lm95234" 32 33enum chips { lm95233, lm95234 }; 34 35static const unsigned short normal_i2c[] = { 36 0x18, 0x2a, 0x2b, 0x4d, 0x4e, I2C_CLIENT_END }; 37 38/* LM95234 registers */ 39#define LM95234_REG_MAN_ID 0xFE 40#define LM95234_REG_CHIP_ID 0xFF 41#define LM95234_REG_STATUS 0x02 42#define LM95234_REG_CONFIG 0x03 43#define LM95234_REG_CONVRATE 0x04 44#define LM95234_REG_STS_FAULT 0x07 45#define LM95234_REG_STS_TCRIT1 0x08 46#define LM95234_REG_STS_TCRIT2 0x09 47#define LM95234_REG_TEMPH(x) ((x) + 0x10) 48#define LM95234_REG_TEMPL(x) ((x) + 0x20) 49#define LM95234_REG_UTEMPH(x) ((x) + 0x19) /* Remote only */ 50#define LM95234_REG_UTEMPL(x) ((x) + 0x29) 51#define LM95234_REG_REM_MODEL 0x30 52#define LM95234_REG_REM_MODEL_STS 0x38 53#define LM95234_REG_OFFSET(x) ((x) + 0x31) /* Remote only */ 54#define LM95234_REG_TCRIT1(x) ((x) + 0x40) 55#define LM95234_REG_TCRIT2(x) ((x) + 0x49) /* Remote channel 1,2 */ 56#define LM95234_REG_TCRIT_HYST 0x5a 57 58#define NATSEMI_MAN_ID 0x01 59#define LM95233_CHIP_ID 0x89 60#define LM95234_CHIP_ID 0x79 61 62/* Client data (each client gets its own) */ 63struct lm95234_data { 64 struct i2c_client *client; 65 const struct attribute_group *groups[3]; 66 struct mutex update_lock; 67 unsigned long last_updated, interval; /* in jiffies */ 68 bool valid; /* false until following fields are valid */ 69 /* registers values */ 70 int temp[5]; /* temperature (signed) */ 71 u32 status; /* fault/alarm status */ 72 u8 tcrit1[5]; /* critical temperature limit */ 73 u8 tcrit2[2]; /* high temperature limit */ 74 s8 toffset[4]; /* remote temperature offset */ 75 u8 thyst; /* common hysteresis */ 76 77 u8 sensor_type; /* temperature sensor type */ 78}; 79 80static int lm95234_read_temp(struct i2c_client *client, int index, int *t) 81{ 82 int val; 83 u16 temp = 0; 84 85 if (index) { 86 val = i2c_smbus_read_byte_data(client, 87 LM95234_REG_UTEMPH(index - 1)); 88 if (val < 0) 89 return val; 90 temp = val << 8; 91 val = i2c_smbus_read_byte_data(client, 92 LM95234_REG_UTEMPL(index - 1)); 93 if (val < 0) 94 return val; 95 temp |= val; 96 *t = temp; 97 } 98 /* 99 * Read signed temperature if unsigned temperature is 0, 100 * or if this is the local sensor. 101 */ 102 if (!temp) { 103 val = i2c_smbus_read_byte_data(client, 104 LM95234_REG_TEMPH(index)); 105 if (val < 0) 106 return val; 107 temp = val << 8; 108 val = i2c_smbus_read_byte_data(client, 109 LM95234_REG_TEMPL(index)); 110 if (val < 0) 111 return val; 112 temp |= val; 113 *t = (s16)temp; 114 } 115 return 0; 116} 117 118static u16 update_intervals[] = { 143, 364, 1000, 2500 }; 119 120/* Fill value cache. Must be called with update lock held. */ 121 122static int lm95234_fill_cache(struct lm95234_data *data, 123 struct i2c_client *client) 124{ 125 int i, ret; 126 127 ret = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE); 128 if (ret < 0) 129 return ret; 130 131 data->interval = msecs_to_jiffies(update_intervals[ret & 0x03]); 132 133 for (i = 0; i < ARRAY_SIZE(data->tcrit1); i++) { 134 ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT1(i)); 135 if (ret < 0) 136 return ret; 137 data->tcrit1[i] = ret; 138 } 139 for (i = 0; i < ARRAY_SIZE(data->tcrit2); i++) { 140 ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT2(i)); 141 if (ret < 0) 142 return ret; 143 data->tcrit2[i] = ret; 144 } 145 for (i = 0; i < ARRAY_SIZE(data->toffset); i++) { 146 ret = i2c_smbus_read_byte_data(client, LM95234_REG_OFFSET(i)); 147 if (ret < 0) 148 return ret; 149 data->toffset[i] = ret; 150 } 151 152 ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT_HYST); 153 if (ret < 0) 154 return ret; 155 data->thyst = ret; 156 157 ret = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL); 158 if (ret < 0) 159 return ret; 160 data->sensor_type = ret; 161 162 return 0; 163} 164 165static int lm95234_update_device(struct lm95234_data *data) 166{ 167 struct i2c_client *client = data->client; 168 int ret; 169 170 mutex_lock(&data->update_lock); 171 172 if (time_after(jiffies, data->last_updated + data->interval) || 173 !data->valid) { 174 int i; 175 176 if (!data->valid) { 177 ret = lm95234_fill_cache(data, client); 178 if (ret < 0) 179 goto abort; 180 } 181 182 data->valid = false; 183 for (i = 0; i < ARRAY_SIZE(data->temp); i++) { 184 ret = lm95234_read_temp(client, i, &data->temp[i]); 185 if (ret < 0) 186 goto abort; 187 } 188 189 ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_FAULT); 190 if (ret < 0) 191 goto abort; 192 data->status = ret; 193 194 ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT1); 195 if (ret < 0) 196 goto abort; 197 data->status |= ret << 8; 198 199 ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT2); 200 if (ret < 0) 201 goto abort; 202 data->status |= ret << 16; 203 204 data->last_updated = jiffies; 205 data->valid = true; 206 } 207 ret = 0; 208abort: 209 mutex_unlock(&data->update_lock); 210 211 return ret; 212} 213 214static ssize_t show_temp(struct device *dev, struct device_attribute *attr, 215 char *buf) 216{ 217 struct lm95234_data *data = dev_get_drvdata(dev); 218 int index = to_sensor_dev_attr(attr)->index; 219 int ret = lm95234_update_device(data); 220 221 if (ret) 222 return ret; 223 224 return sprintf(buf, "%d\n", 225 DIV_ROUND_CLOSEST(data->temp[index] * 125, 32)); 226} 227 228static ssize_t show_alarm(struct device *dev, 229 struct device_attribute *attr, char *buf) 230{ 231 struct lm95234_data *data = dev_get_drvdata(dev); 232 u32 mask = to_sensor_dev_attr(attr)->index; 233 int ret = lm95234_update_device(data); 234 235 if (ret) 236 return ret; 237 238 return sprintf(buf, "%u", !!(data->status & mask)); 239} 240 241static ssize_t show_type(struct device *dev, struct device_attribute *attr, 242 char *buf) 243{ 244 struct lm95234_data *data = dev_get_drvdata(dev); 245 u8 mask = to_sensor_dev_attr(attr)->index; 246 int ret = lm95234_update_device(data); 247 248 if (ret) 249 return ret; 250 251 return sprintf(buf, data->sensor_type & mask ? "1\n" : "2\n"); 252} 253 254static ssize_t set_type(struct device *dev, struct device_attribute *attr, 255 const char *buf, size_t count) 256{ 257 struct lm95234_data *data = dev_get_drvdata(dev); 258 unsigned long val; 259 u8 mask = to_sensor_dev_attr(attr)->index; 260 int ret = lm95234_update_device(data); 261 262 if (ret) 263 return ret; 264 265 ret = kstrtoul(buf, 10, &val); 266 if (ret < 0) 267 return ret; 268 269 if (val != 1 && val != 2) 270 return -EINVAL; 271 272 mutex_lock(&data->update_lock); 273 if (val == 1) 274 data->sensor_type |= mask; 275 else 276 data->sensor_type &= ~mask; 277 data->valid = false; 278 i2c_smbus_write_byte_data(data->client, LM95234_REG_REM_MODEL, 279 data->sensor_type); 280 mutex_unlock(&data->update_lock); 281 282 return count; 283} 284 285static ssize_t show_tcrit2(struct device *dev, struct device_attribute *attr, 286 char *buf) 287{ 288 struct lm95234_data *data = dev_get_drvdata(dev); 289 int index = to_sensor_dev_attr(attr)->index; 290 int ret = lm95234_update_device(data); 291 292 if (ret) 293 return ret; 294 295 return sprintf(buf, "%u", data->tcrit2[index] * 1000); 296} 297 298static ssize_t set_tcrit2(struct device *dev, struct device_attribute *attr, 299 const char *buf, size_t count) 300{ 301 struct lm95234_data *data = dev_get_drvdata(dev); 302 int index = to_sensor_dev_attr(attr)->index; 303 long val; 304 int ret = lm95234_update_device(data); 305 306 if (ret) 307 return ret; 308 309 ret = kstrtol(buf, 10, &val); 310 if (ret < 0) 311 return ret; 312 313 val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, index ? 255 : 127); 314 315 mutex_lock(&data->update_lock); 316 data->tcrit2[index] = val; 317 i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT2(index), val); 318 mutex_unlock(&data->update_lock); 319 320 return count; 321} 322 323static ssize_t show_tcrit2_hyst(struct device *dev, 324 struct device_attribute *attr, char *buf) 325{ 326 struct lm95234_data *data = dev_get_drvdata(dev); 327 int index = to_sensor_dev_attr(attr)->index; 328 int ret = lm95234_update_device(data); 329 330 if (ret) 331 return ret; 332 333 /* Result can be negative, so be careful with unsigned operands */ 334 return sprintf(buf, "%d", 335 ((int)data->tcrit2[index] - (int)data->thyst) * 1000); 336} 337 338static ssize_t show_tcrit1(struct device *dev, struct device_attribute *attr, 339 char *buf) 340{ 341 struct lm95234_data *data = dev_get_drvdata(dev); 342 int index = to_sensor_dev_attr(attr)->index; 343 344 return sprintf(buf, "%u", data->tcrit1[index] * 1000); 345} 346 347static ssize_t set_tcrit1(struct device *dev, struct device_attribute *attr, 348 const char *buf, size_t count) 349{ 350 struct lm95234_data *data = dev_get_drvdata(dev); 351 int index = to_sensor_dev_attr(attr)->index; 352 int ret = lm95234_update_device(data); 353 long val; 354 355 if (ret) 356 return ret; 357 358 ret = kstrtol(buf, 10, &val); 359 if (ret < 0) 360 return ret; 361 362 val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 255); 363 364 mutex_lock(&data->update_lock); 365 data->tcrit1[index] = val; 366 i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT1(index), val); 367 mutex_unlock(&data->update_lock); 368 369 return count; 370} 371 372static ssize_t show_tcrit1_hyst(struct device *dev, 373 struct device_attribute *attr, char *buf) 374{ 375 struct lm95234_data *data = dev_get_drvdata(dev); 376 int index = to_sensor_dev_attr(attr)->index; 377 int ret = lm95234_update_device(data); 378 379 if (ret) 380 return ret; 381 382 /* Result can be negative, so be careful with unsigned operands */ 383 return sprintf(buf, "%d", 384 ((int)data->tcrit1[index] - (int)data->thyst) * 1000); 385} 386 387static ssize_t set_tcrit1_hyst(struct device *dev, 388 struct device_attribute *attr, 389 const char *buf, size_t count) 390{ 391 struct lm95234_data *data = dev_get_drvdata(dev); 392 int index = to_sensor_dev_attr(attr)->index; 393 int ret = lm95234_update_device(data); 394 long val; 395 396 if (ret) 397 return ret; 398 399 ret = kstrtol(buf, 10, &val); 400 if (ret < 0) 401 return ret; 402 403 val = DIV_ROUND_CLOSEST(val, 1000); 404 val = clamp_val((int)data->tcrit1[index] - val, 0, 31); 405 406 mutex_lock(&data->update_lock); 407 data->thyst = val; 408 i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT_HYST, val); 409 mutex_unlock(&data->update_lock); 410 411 return count; 412} 413 414static ssize_t show_offset(struct device *dev, struct device_attribute *attr, 415 char *buf) 416{ 417 struct lm95234_data *data = dev_get_drvdata(dev); 418 int index = to_sensor_dev_attr(attr)->index; 419 int ret = lm95234_update_device(data); 420 421 if (ret) 422 return ret; 423 424 return sprintf(buf, "%d", data->toffset[index] * 500); 425} 426 427static ssize_t set_offset(struct device *dev, struct device_attribute *attr, 428 const char *buf, size_t count) 429{ 430 struct lm95234_data *data = dev_get_drvdata(dev); 431 int index = to_sensor_dev_attr(attr)->index; 432 int ret = lm95234_update_device(data); 433 long val; 434 435 if (ret) 436 return ret; 437 438 ret = kstrtol(buf, 10, &val); 439 if (ret < 0) 440 return ret; 441 442 /* Accuracy is 1/2 degrees C */ 443 val = clamp_val(DIV_ROUND_CLOSEST(val, 500), -128, 127); 444 445 mutex_lock(&data->update_lock); 446 data->toffset[index] = val; 447 i2c_smbus_write_byte_data(data->client, LM95234_REG_OFFSET(index), val); 448 mutex_unlock(&data->update_lock); 449 450 return count; 451} 452 453static ssize_t show_interval(struct device *dev, struct device_attribute *attr, 454 char *buf) 455{ 456 struct lm95234_data *data = dev_get_drvdata(dev); 457 int ret = lm95234_update_device(data); 458 459 if (ret) 460 return ret; 461 462 return sprintf(buf, "%lu\n", 463 DIV_ROUND_CLOSEST(data->interval * 1000, HZ)); 464} 465 466static ssize_t set_interval(struct device *dev, struct device_attribute *attr, 467 const char *buf, size_t count) 468{ 469 struct lm95234_data *data = dev_get_drvdata(dev); 470 int ret = lm95234_update_device(data); 471 unsigned long val; 472 u8 regval; 473 474 if (ret) 475 return ret; 476 477 ret = kstrtoul(buf, 10, &val); 478 if (ret < 0) 479 return ret; 480 481 for (regval = 0; regval < 3; regval++) { 482 if (val <= update_intervals[regval]) 483 break; 484 } 485 486 mutex_lock(&data->update_lock); 487 data->interval = msecs_to_jiffies(update_intervals[regval]); 488 i2c_smbus_write_byte_data(data->client, LM95234_REG_CONVRATE, regval); 489 mutex_unlock(&data->update_lock); 490 491 return count; 492} 493 494static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); 495static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1); 496static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2); 497static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3); 498static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4); 499 500static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 501 BIT(0) | BIT(1)); 502static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 503 BIT(2) | BIT(3)); 504static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 505 BIT(4) | BIT(5)); 506static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL, 507 BIT(6) | BIT(7)); 508 509static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type, 510 BIT(1)); 511static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type, set_type, 512 BIT(2)); 513static SENSOR_DEVICE_ATTR(temp4_type, S_IWUSR | S_IRUGO, show_type, set_type, 514 BIT(3)); 515static SENSOR_DEVICE_ATTR(temp5_type, S_IWUSR | S_IRUGO, show_type, set_type, 516 BIT(4)); 517 518static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_tcrit1, 519 set_tcrit1, 0); 520static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_tcrit2, 521 set_tcrit2, 0); 522static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_tcrit2, 523 set_tcrit2, 1); 524static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_tcrit1, 525 set_tcrit1, 3); 526static SENSOR_DEVICE_ATTR(temp5_max, S_IWUSR | S_IRUGO, show_tcrit1, 527 set_tcrit1, 4); 528 529static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_tcrit1_hyst, 530 set_tcrit1_hyst, 0); 531static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 0); 532static SENSOR_DEVICE_ATTR(temp3_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 1); 533static SENSOR_DEVICE_ATTR(temp4_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 3); 534static SENSOR_DEVICE_ATTR(temp5_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 4); 535 536static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 537 BIT(0 + 8)); 538static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 539 BIT(1 + 16)); 540static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 541 BIT(2 + 16)); 542static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 543 BIT(3 + 8)); 544static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 545 BIT(4 + 8)); 546 547static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_tcrit1, 548 set_tcrit1, 1); 549static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_tcrit1, 550 set_tcrit1, 2); 551 552static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 1); 553static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 2); 554 555static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 556 BIT(1 + 8)); 557static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 558 BIT(2 + 8)); 559 560static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_offset, 561 set_offset, 0); 562static SENSOR_DEVICE_ATTR(temp3_offset, S_IWUSR | S_IRUGO, show_offset, 563 set_offset, 1); 564static SENSOR_DEVICE_ATTR(temp4_offset, S_IWUSR | S_IRUGO, show_offset, 565 set_offset, 2); 566static SENSOR_DEVICE_ATTR(temp5_offset, S_IWUSR | S_IRUGO, show_offset, 567 set_offset, 3); 568 569static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval, 570 set_interval); 571 572static struct attribute *lm95234_common_attrs[] = { 573 &sensor_dev_attr_temp1_input.dev_attr.attr, 574 &sensor_dev_attr_temp2_input.dev_attr.attr, 575 &sensor_dev_attr_temp3_input.dev_attr.attr, 576 &sensor_dev_attr_temp2_fault.dev_attr.attr, 577 &sensor_dev_attr_temp3_fault.dev_attr.attr, 578 &sensor_dev_attr_temp2_type.dev_attr.attr, 579 &sensor_dev_attr_temp3_type.dev_attr.attr, 580 &sensor_dev_attr_temp1_max.dev_attr.attr, 581 &sensor_dev_attr_temp2_max.dev_attr.attr, 582 &sensor_dev_attr_temp3_max.dev_attr.attr, 583 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, 584 &sensor_dev_attr_temp2_max_hyst.dev_attr.attr, 585 &sensor_dev_attr_temp3_max_hyst.dev_attr.attr, 586 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, 587 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, 588 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, 589 &sensor_dev_attr_temp2_crit.dev_attr.attr, 590 &sensor_dev_attr_temp3_crit.dev_attr.attr, 591 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, 592 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr, 593 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, 594 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr, 595 &sensor_dev_attr_temp2_offset.dev_attr.attr, 596 &sensor_dev_attr_temp3_offset.dev_attr.attr, 597 &dev_attr_update_interval.attr, 598 NULL 599}; 600 601static const struct attribute_group lm95234_common_group = { 602 .attrs = lm95234_common_attrs, 603}; 604 605static struct attribute *lm95234_attrs[] = { 606 &sensor_dev_attr_temp4_input.dev_attr.attr, 607 &sensor_dev_attr_temp5_input.dev_attr.attr, 608 &sensor_dev_attr_temp4_fault.dev_attr.attr, 609 &sensor_dev_attr_temp5_fault.dev_attr.attr, 610 &sensor_dev_attr_temp4_type.dev_attr.attr, 611 &sensor_dev_attr_temp5_type.dev_attr.attr, 612 &sensor_dev_attr_temp4_max.dev_attr.attr, 613 &sensor_dev_attr_temp5_max.dev_attr.attr, 614 &sensor_dev_attr_temp4_max_hyst.dev_attr.attr, 615 &sensor_dev_attr_temp5_max_hyst.dev_attr.attr, 616 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr, 617 &sensor_dev_attr_temp5_max_alarm.dev_attr.attr, 618 &sensor_dev_attr_temp4_offset.dev_attr.attr, 619 &sensor_dev_attr_temp5_offset.dev_attr.attr, 620 NULL 621}; 622 623static const struct attribute_group lm95234_group = { 624 .attrs = lm95234_attrs, 625}; 626 627static int lm95234_detect(struct i2c_client *client, 628 struct i2c_board_info *info) 629{ 630 struct i2c_adapter *adapter = client->adapter; 631 int address = client->addr; 632 u8 config_mask, model_mask; 633 int mfg_id, chip_id, val; 634 const char *name; 635 636 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 637 return -ENODEV; 638 639 mfg_id = i2c_smbus_read_byte_data(client, LM95234_REG_MAN_ID); 640 if (mfg_id != NATSEMI_MAN_ID) 641 return -ENODEV; 642 643 chip_id = i2c_smbus_read_byte_data(client, LM95234_REG_CHIP_ID); 644 switch (chip_id) { 645 case LM95233_CHIP_ID: 646 if (address != 0x18 && address != 0x2a && address != 0x2b) 647 return -ENODEV; 648 config_mask = 0xbf; 649 model_mask = 0xf9; 650 name = "lm95233"; 651 break; 652 case LM95234_CHIP_ID: 653 if (address != 0x18 && address != 0x4d && address != 0x4e) 654 return -ENODEV; 655 config_mask = 0xbc; 656 model_mask = 0xe1; 657 name = "lm95234"; 658 break; 659 default: 660 return -ENODEV; 661 } 662 663 val = i2c_smbus_read_byte_data(client, LM95234_REG_STATUS); 664 if (val & 0x30) 665 return -ENODEV; 666 667 val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG); 668 if (val & config_mask) 669 return -ENODEV; 670 671 val = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE); 672 if (val & 0xfc) 673 return -ENODEV; 674 675 val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL); 676 if (val & model_mask) 677 return -ENODEV; 678 679 val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS); 680 if (val & model_mask) 681 return -ENODEV; 682 683 strlcpy(info->type, name, I2C_NAME_SIZE); 684 return 0; 685} 686 687static int lm95234_init_client(struct i2c_client *client) 688{ 689 int val, model; 690 691 /* start conversion if necessary */ 692 val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG); 693 if (val < 0) 694 return val; 695 if (val & 0x40) 696 i2c_smbus_write_byte_data(client, LM95234_REG_CONFIG, 697 val & ~0x40); 698 699 /* If diode type status reports an error, try to fix it */ 700 val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS); 701 if (val < 0) 702 return val; 703 model = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL); 704 if (model < 0) 705 return model; 706 if (model & val) { 707 dev_notice(&client->dev, 708 "Fixing remote diode type misconfiguration (0x%x)\n", 709 val); 710 i2c_smbus_write_byte_data(client, LM95234_REG_REM_MODEL, 711 model & ~val); 712 } 713 return 0; 714} 715 716static int lm95234_probe(struct i2c_client *client, 717 const struct i2c_device_id *id) 718{ 719 struct device *dev = &client->dev; 720 struct lm95234_data *data; 721 struct device *hwmon_dev; 722 int err; 723 724 data = devm_kzalloc(dev, sizeof(struct lm95234_data), GFP_KERNEL); 725 if (!data) 726 return -ENOMEM; 727 728 data->client = client; 729 mutex_init(&data->update_lock); 730 731 /* Initialize the LM95234 chip */ 732 err = lm95234_init_client(client); 733 if (err < 0) 734 return err; 735 736 data->groups[0] = &lm95234_common_group; 737 if (id->driver_data == lm95234) 738 data->groups[1] = &lm95234_group; 739 740 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 741 data, data->groups); 742 return PTR_ERR_OR_ZERO(hwmon_dev); 743} 744 745/* Driver data (common to all clients) */ 746static const struct i2c_device_id lm95234_id[] = { 747 { "lm95233", lm95233 }, 748 { "lm95234", lm95234 }, 749 { } 750}; 751MODULE_DEVICE_TABLE(i2c, lm95234_id); 752 753static struct i2c_driver lm95234_driver = { 754 .class = I2C_CLASS_HWMON, 755 .driver = { 756 .name = DRVNAME, 757 }, 758 .probe = lm95234_probe, 759 .id_table = lm95234_id, 760 .detect = lm95234_detect, 761 .address_list = normal_i2c, 762}; 763 764module_i2c_driver(lm95234_driver); 765 766MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); 767MODULE_DESCRIPTION("LM95233/LM95234 sensor driver"); 768MODULE_LICENSE("GPL"); 769