1 /* 2 * max31790.c - Part of lm_sensors, Linux kernel modules for hardware 3 * monitoring. 4 * 5 * (C) 2015 by Il Han <corone.il.han@gmail.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <linux/err.h> 19 #include <linux/hwmon.h> 20 #include <linux/hwmon-sysfs.h> 21 #include <linux/i2c.h> 22 #include <linux/init.h> 23 #include <linux/jiffies.h> 24 #include <linux/module.h> 25 #include <linux/slab.h> 26 27 /* MAX31790 registers */ 28 #define MAX31790_REG_GLOBAL_CONFIG 0x00 29 #define MAX31790_REG_FAN_CONFIG(ch) (0x02 + (ch)) 30 #define MAX31790_REG_FAN_DYNAMICS(ch) (0x08 + (ch)) 31 #define MAX31790_REG_FAN_FAULT_STATUS2 0x10 32 #define MAX31790_REG_FAN_FAULT_STATUS1 0x11 33 #define MAX31790_REG_TACH_COUNT(ch) (0x18 + (ch) * 2) 34 #define MAX31790_REG_PWM_DUTY_CYCLE(ch) (0x30 + (ch) * 2) 35 #define MAX31790_REG_PWMOUT(ch) (0x40 + (ch) * 2) 36 #define MAX31790_REG_TARGET_COUNT(ch) (0x50 + (ch) * 2) 37 38 /* Fan Config register bits */ 39 #define MAX31790_FAN_CFG_RPM_MODE 0x80 40 #define MAX31790_FAN_CFG_TACH_INPUT_EN 0x08 41 #define MAX31790_FAN_CFG_TACH_INPUT 0x01 42 43 /* Fan Dynamics register bits */ 44 #define MAX31790_FAN_DYN_SR_SHIFT 5 45 #define MAX31790_FAN_DYN_SR_MASK 0xE0 46 #define SR_FROM_REG(reg) (((reg) & MAX31790_FAN_DYN_SR_MASK) \ 47 >> MAX31790_FAN_DYN_SR_SHIFT) 48 49 #define FAN_RPM_MIN 120 50 #define FAN_RPM_MAX 7864320 51 52 #define RPM_FROM_REG(reg, sr) (((reg) >> 4) ? \ 53 ((60 * (sr) * 8192) / ((reg) >> 4)) : \ 54 FAN_RPM_MAX) 55 #define RPM_TO_REG(rpm, sr) ((60 * (sr) * 8192) / ((rpm) * 2)) 56 57 #define NR_CHANNEL 6 58 59 /* 60 * Client data (each client gets its own) 61 */ 62 struct max31790_data { 63 struct i2c_client *client; 64 struct mutex update_lock; 65 bool valid; /* zero until following fields are valid */ 66 unsigned long last_updated; /* in jiffies */ 67 68 /* register values */ 69 u8 fan_config[NR_CHANNEL]; 70 u8 fan_dynamics[NR_CHANNEL]; 71 u16 fault_status; 72 u16 tach[NR_CHANNEL * 2]; 73 u16 pwm[NR_CHANNEL]; 74 u16 target_count[NR_CHANNEL]; 75 }; 76 77 static struct max31790_data *max31790_update_device(struct device *dev) 78 { 79 struct max31790_data *data = dev_get_drvdata(dev); 80 struct i2c_client *client = data->client; 81 struct max31790_data *ret = data; 82 int i; 83 int rv; 84 85 mutex_lock(&data->update_lock); 86 87 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 88 rv = i2c_smbus_read_byte_data(client, 89 MAX31790_REG_FAN_FAULT_STATUS1); 90 if (rv < 0) 91 goto abort; 92 data->fault_status = rv & 0x3F; 93 94 rv = i2c_smbus_read_byte_data(client, 95 MAX31790_REG_FAN_FAULT_STATUS2); 96 if (rv < 0) 97 goto abort; 98 data->fault_status |= (rv & 0x3F) << 6; 99 100 for (i = 0; i < NR_CHANNEL; i++) { 101 rv = i2c_smbus_read_word_swapped(client, 102 MAX31790_REG_TACH_COUNT(i)); 103 if (rv < 0) 104 goto abort; 105 data->tach[i] = rv; 106 107 if (data->fan_config[i] 108 & MAX31790_FAN_CFG_TACH_INPUT) { 109 rv = i2c_smbus_read_word_swapped(client, 110 MAX31790_REG_TACH_COUNT(NR_CHANNEL 111 + i)); 112 if (rv < 0) 113 goto abort; 114 data->tach[NR_CHANNEL + i] = rv; 115 } else { 116 rv = i2c_smbus_read_word_swapped(client, 117 MAX31790_REG_PWMOUT(i)); 118 if (rv < 0) 119 goto abort; 120 data->pwm[i] = rv; 121 122 rv = i2c_smbus_read_word_swapped(client, 123 MAX31790_REG_TARGET_COUNT(i)); 124 if (rv < 0) 125 goto abort; 126 data->target_count[i] = rv; 127 } 128 } 129 130 data->last_updated = jiffies; 131 data->valid = true; 132 } 133 goto done; 134 135 abort: 136 data->valid = false; 137 ret = ERR_PTR(rv); 138 139 done: 140 mutex_unlock(&data->update_lock); 141 142 return ret; 143 } 144 145 static const u8 tach_period[8] = { 1, 2, 4, 8, 16, 32, 32, 32 }; 146 147 static u8 get_tach_period(u8 fan_dynamics) 148 { 149 return tach_period[SR_FROM_REG(fan_dynamics)]; 150 } 151 152 static u8 bits_for_tach_period(int rpm) 153 { 154 u8 bits; 155 156 if (rpm < 500) 157 bits = 0x0; 158 else if (rpm < 1000) 159 bits = 0x1; 160 else if (rpm < 2000) 161 bits = 0x2; 162 else if (rpm < 4000) 163 bits = 0x3; 164 else if (rpm < 8000) 165 bits = 0x4; 166 else 167 bits = 0x5; 168 169 return bits; 170 } 171 172 static ssize_t get_fan(struct device *dev, 173 struct device_attribute *devattr, char *buf) 174 { 175 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 176 struct max31790_data *data = max31790_update_device(dev); 177 int sr, rpm; 178 179 if (IS_ERR(data)) 180 return PTR_ERR(data); 181 182 sr = get_tach_period(data->fan_dynamics[attr->index]); 183 rpm = RPM_FROM_REG(data->tach[attr->index], sr); 184 185 return sprintf(buf, "%d\n", rpm); 186 } 187 188 static ssize_t get_fan_target(struct device *dev, 189 struct device_attribute *devattr, char *buf) 190 { 191 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 192 struct max31790_data *data = max31790_update_device(dev); 193 int sr, rpm; 194 195 if (IS_ERR(data)) 196 return PTR_ERR(data); 197 198 sr = get_tach_period(data->fan_dynamics[attr->index]); 199 rpm = RPM_FROM_REG(data->target_count[attr->index], sr); 200 201 return sprintf(buf, "%d\n", rpm); 202 } 203 204 static ssize_t set_fan_target(struct device *dev, 205 struct device_attribute *devattr, 206 const char *buf, size_t count) 207 { 208 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 209 struct max31790_data *data = dev_get_drvdata(dev); 210 struct i2c_client *client = data->client; 211 u8 bits; 212 int sr; 213 int target_count; 214 unsigned long rpm; 215 int err; 216 217 err = kstrtoul(buf, 10, &rpm); 218 if (err) 219 return err; 220 221 mutex_lock(&data->update_lock); 222 223 rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX); 224 bits = bits_for_tach_period(rpm); 225 data->fan_dynamics[attr->index] = 226 ((data->fan_dynamics[attr->index] 227 & ~MAX31790_FAN_DYN_SR_MASK) 228 | (bits << MAX31790_FAN_DYN_SR_SHIFT)); 229 err = i2c_smbus_write_byte_data(client, 230 MAX31790_REG_FAN_DYNAMICS(attr->index), 231 data->fan_dynamics[attr->index]); 232 233 if (err < 0) { 234 mutex_unlock(&data->update_lock); 235 return err; 236 } 237 238 sr = get_tach_period(data->fan_dynamics[attr->index]); 239 target_count = RPM_TO_REG(rpm, sr); 240 target_count = clamp_val(target_count, 0x1, 0x7FF); 241 242 data->target_count[attr->index] = target_count << 5; 243 244 err = i2c_smbus_write_word_swapped(client, 245 MAX31790_REG_TARGET_COUNT(attr->index), 246 data->target_count[attr->index]); 247 248 mutex_unlock(&data->update_lock); 249 250 if (err < 0) 251 return err; 252 253 return count; 254 } 255 256 static ssize_t get_pwm(struct device *dev, 257 struct device_attribute *devattr, char *buf) 258 { 259 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 260 struct max31790_data *data = max31790_update_device(dev); 261 int pwm; 262 263 if (IS_ERR(data)) 264 return PTR_ERR(data); 265 266 pwm = data->pwm[attr->index] >> 8; 267 268 return sprintf(buf, "%d\n", pwm); 269 } 270 271 static ssize_t set_pwm(struct device *dev, 272 struct device_attribute *devattr, 273 const char *buf, size_t count) 274 { 275 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 276 struct max31790_data *data = dev_get_drvdata(dev); 277 struct i2c_client *client = data->client; 278 unsigned long pwm; 279 int err; 280 281 err = kstrtoul(buf, 10, &pwm); 282 if (err) 283 return err; 284 285 if (pwm > 255) 286 return -EINVAL; 287 288 mutex_lock(&data->update_lock); 289 290 data->pwm[attr->index] = pwm << 8; 291 err = i2c_smbus_write_word_swapped(client, 292 MAX31790_REG_PWMOUT(attr->index), 293 data->pwm[attr->index]); 294 295 mutex_unlock(&data->update_lock); 296 297 if (err < 0) 298 return err; 299 300 return count; 301 } 302 303 static ssize_t get_pwm_enable(struct device *dev, 304 struct device_attribute *devattr, char *buf) 305 { 306 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 307 struct max31790_data *data = max31790_update_device(dev); 308 int mode; 309 310 if (IS_ERR(data)) 311 return PTR_ERR(data); 312 313 if (data->fan_config[attr->index] & MAX31790_FAN_CFG_RPM_MODE) 314 mode = 2; 315 else if (data->fan_config[attr->index] & MAX31790_FAN_CFG_TACH_INPUT_EN) 316 mode = 1; 317 else 318 mode = 0; 319 320 return sprintf(buf, "%d\n", mode); 321 } 322 323 static ssize_t set_pwm_enable(struct device *dev, 324 struct device_attribute *devattr, 325 const char *buf, size_t count) 326 { 327 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 328 struct max31790_data *data = dev_get_drvdata(dev); 329 struct i2c_client *client = data->client; 330 unsigned long mode; 331 int err; 332 333 err = kstrtoul(buf, 10, &mode); 334 if (err) 335 return err; 336 337 switch (mode) { 338 case 0: 339 data->fan_config[attr->index] = 340 data->fan_config[attr->index] 341 & ~(MAX31790_FAN_CFG_TACH_INPUT_EN 342 | MAX31790_FAN_CFG_RPM_MODE); 343 break; 344 case 1: 345 data->fan_config[attr->index] = 346 (data->fan_config[attr->index] 347 | MAX31790_FAN_CFG_TACH_INPUT_EN) 348 & ~MAX31790_FAN_CFG_RPM_MODE; 349 break; 350 case 2: 351 data->fan_config[attr->index] = 352 data->fan_config[attr->index] 353 | MAX31790_FAN_CFG_TACH_INPUT_EN 354 | MAX31790_FAN_CFG_RPM_MODE; 355 break; 356 default: 357 return -EINVAL; 358 } 359 360 mutex_lock(&data->update_lock); 361 362 err = i2c_smbus_write_byte_data(client, 363 MAX31790_REG_FAN_CONFIG(attr->index), 364 data->fan_config[attr->index]); 365 366 mutex_unlock(&data->update_lock); 367 368 if (err < 0) 369 return err; 370 371 return count; 372 } 373 374 static ssize_t get_fan_fault(struct device *dev, 375 struct device_attribute *devattr, char *buf) 376 { 377 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 378 struct max31790_data *data = max31790_update_device(dev); 379 int fault; 380 381 if (IS_ERR(data)) 382 return PTR_ERR(data); 383 384 fault = !!(data->fault_status & (1 << attr->index)); 385 386 return sprintf(buf, "%d\n", fault); 387 } 388 389 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0); 390 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1); 391 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2); 392 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, get_fan, NULL, 3); 393 static SENSOR_DEVICE_ATTR(fan5_input, S_IRUGO, get_fan, NULL, 4); 394 static SENSOR_DEVICE_ATTR(fan6_input, S_IRUGO, get_fan, NULL, 5); 395 396 static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan_fault, NULL, 0); 397 static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, get_fan_fault, NULL, 1); 398 static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, get_fan_fault, NULL, 2); 399 static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, get_fan_fault, NULL, 3); 400 static SENSOR_DEVICE_ATTR(fan5_fault, S_IRUGO, get_fan_fault, NULL, 4); 401 static SENSOR_DEVICE_ATTR(fan6_fault, S_IRUGO, get_fan_fault, NULL, 5); 402 403 static SENSOR_DEVICE_ATTR(fan7_input, S_IRUGO, get_fan, NULL, 6); 404 static SENSOR_DEVICE_ATTR(fan8_input, S_IRUGO, get_fan, NULL, 7); 405 static SENSOR_DEVICE_ATTR(fan9_input, S_IRUGO, get_fan, NULL, 8); 406 static SENSOR_DEVICE_ATTR(fan10_input, S_IRUGO, get_fan, NULL, 9); 407 static SENSOR_DEVICE_ATTR(fan11_input, S_IRUGO, get_fan, NULL, 10); 408 static SENSOR_DEVICE_ATTR(fan12_input, S_IRUGO, get_fan, NULL, 11); 409 410 static SENSOR_DEVICE_ATTR(fan7_fault, S_IRUGO, get_fan_fault, NULL, 6); 411 static SENSOR_DEVICE_ATTR(fan8_fault, S_IRUGO, get_fan_fault, NULL, 7); 412 static SENSOR_DEVICE_ATTR(fan9_fault, S_IRUGO, get_fan_fault, NULL, 8); 413 static SENSOR_DEVICE_ATTR(fan10_fault, S_IRUGO, get_fan_fault, NULL, 9); 414 static SENSOR_DEVICE_ATTR(fan11_fault, S_IRUGO, get_fan_fault, NULL, 10); 415 static SENSOR_DEVICE_ATTR(fan12_fault, S_IRUGO, get_fan_fault, NULL, 11); 416 417 static SENSOR_DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO, 418 get_fan_target, set_fan_target, 0); 419 static SENSOR_DEVICE_ATTR(fan2_target, S_IWUSR | S_IRUGO, 420 get_fan_target, set_fan_target, 1); 421 static SENSOR_DEVICE_ATTR(fan3_target, S_IWUSR | S_IRUGO, 422 get_fan_target, set_fan_target, 2); 423 static SENSOR_DEVICE_ATTR(fan4_target, S_IWUSR | S_IRUGO, 424 get_fan_target, set_fan_target, 3); 425 static SENSOR_DEVICE_ATTR(fan5_target, S_IWUSR | S_IRUGO, 426 get_fan_target, set_fan_target, 4); 427 static SENSOR_DEVICE_ATTR(fan6_target, S_IWUSR | S_IRUGO, 428 get_fan_target, set_fan_target, 5); 429 430 static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 0); 431 static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 1); 432 static SENSOR_DEVICE_ATTR(pwm3, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 2); 433 static SENSOR_DEVICE_ATTR(pwm4, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 3); 434 static SENSOR_DEVICE_ATTR(pwm5, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 4); 435 static SENSOR_DEVICE_ATTR(pwm6, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 5); 436 437 static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, 438 get_pwm_enable, set_pwm_enable, 0); 439 static SENSOR_DEVICE_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, 440 get_pwm_enable, set_pwm_enable, 1); 441 static SENSOR_DEVICE_ATTR(pwm3_enable, S_IWUSR | S_IRUGO, 442 get_pwm_enable, set_pwm_enable, 2); 443 static SENSOR_DEVICE_ATTR(pwm4_enable, S_IWUSR | S_IRUGO, 444 get_pwm_enable, set_pwm_enable, 3); 445 static SENSOR_DEVICE_ATTR(pwm5_enable, S_IWUSR | S_IRUGO, 446 get_pwm_enable, set_pwm_enable, 4); 447 static SENSOR_DEVICE_ATTR(pwm6_enable, S_IWUSR | S_IRUGO, 448 get_pwm_enable, set_pwm_enable, 5); 449 450 static struct attribute *max31790_attrs[] = { 451 &sensor_dev_attr_fan1_input.dev_attr.attr, 452 &sensor_dev_attr_fan2_input.dev_attr.attr, 453 &sensor_dev_attr_fan3_input.dev_attr.attr, 454 &sensor_dev_attr_fan4_input.dev_attr.attr, 455 &sensor_dev_attr_fan5_input.dev_attr.attr, 456 &sensor_dev_attr_fan6_input.dev_attr.attr, 457 458 &sensor_dev_attr_fan1_fault.dev_attr.attr, 459 &sensor_dev_attr_fan2_fault.dev_attr.attr, 460 &sensor_dev_attr_fan3_fault.dev_attr.attr, 461 &sensor_dev_attr_fan4_fault.dev_attr.attr, 462 &sensor_dev_attr_fan5_fault.dev_attr.attr, 463 &sensor_dev_attr_fan6_fault.dev_attr.attr, 464 465 &sensor_dev_attr_fan7_input.dev_attr.attr, 466 &sensor_dev_attr_fan8_input.dev_attr.attr, 467 &sensor_dev_attr_fan9_input.dev_attr.attr, 468 &sensor_dev_attr_fan10_input.dev_attr.attr, 469 &sensor_dev_attr_fan11_input.dev_attr.attr, 470 &sensor_dev_attr_fan12_input.dev_attr.attr, 471 472 &sensor_dev_attr_fan7_fault.dev_attr.attr, 473 &sensor_dev_attr_fan8_fault.dev_attr.attr, 474 &sensor_dev_attr_fan9_fault.dev_attr.attr, 475 &sensor_dev_attr_fan10_fault.dev_attr.attr, 476 &sensor_dev_attr_fan11_fault.dev_attr.attr, 477 &sensor_dev_attr_fan12_fault.dev_attr.attr, 478 479 &sensor_dev_attr_fan1_target.dev_attr.attr, 480 &sensor_dev_attr_fan2_target.dev_attr.attr, 481 &sensor_dev_attr_fan3_target.dev_attr.attr, 482 &sensor_dev_attr_fan4_target.dev_attr.attr, 483 &sensor_dev_attr_fan5_target.dev_attr.attr, 484 &sensor_dev_attr_fan6_target.dev_attr.attr, 485 486 &sensor_dev_attr_pwm1.dev_attr.attr, 487 &sensor_dev_attr_pwm2.dev_attr.attr, 488 &sensor_dev_attr_pwm3.dev_attr.attr, 489 &sensor_dev_attr_pwm4.dev_attr.attr, 490 &sensor_dev_attr_pwm5.dev_attr.attr, 491 &sensor_dev_attr_pwm6.dev_attr.attr, 492 493 &sensor_dev_attr_pwm1_enable.dev_attr.attr, 494 &sensor_dev_attr_pwm2_enable.dev_attr.attr, 495 &sensor_dev_attr_pwm3_enable.dev_attr.attr, 496 &sensor_dev_attr_pwm4_enable.dev_attr.attr, 497 &sensor_dev_attr_pwm5_enable.dev_attr.attr, 498 &sensor_dev_attr_pwm6_enable.dev_attr.attr, 499 NULL 500 }; 501 502 static umode_t max31790_attrs_visible(struct kobject *kobj, 503 struct attribute *a, int n) 504 { 505 struct device *dev = container_of(kobj, struct device, kobj); 506 struct max31790_data *data = dev_get_drvdata(dev); 507 struct device_attribute *devattr = 508 container_of(a, struct device_attribute, attr); 509 int index = to_sensor_dev_attr(devattr)->index % NR_CHANNEL; 510 u8 fan_config; 511 512 fan_config = data->fan_config[index]; 513 514 if (n >= NR_CHANNEL * 2 && n < NR_CHANNEL * 4 && 515 !(fan_config & MAX31790_FAN_CFG_TACH_INPUT)) 516 return 0; 517 if (n >= NR_CHANNEL * 4 && (fan_config & MAX31790_FAN_CFG_TACH_INPUT)) 518 return 0; 519 520 return a->mode; 521 } 522 523 static const struct attribute_group max31790_group = { 524 .attrs = max31790_attrs, 525 .is_visible = max31790_attrs_visible, 526 }; 527 __ATTRIBUTE_GROUPS(max31790); 528 529 static int max31790_init_client(struct i2c_client *client, 530 struct max31790_data *data) 531 { 532 int i, rv; 533 534 for (i = 0; i < NR_CHANNEL; i++) { 535 rv = i2c_smbus_read_byte_data(client, 536 MAX31790_REG_FAN_CONFIG(i)); 537 if (rv < 0) 538 return rv; 539 data->fan_config[i] = rv; 540 541 rv = i2c_smbus_read_byte_data(client, 542 MAX31790_REG_FAN_DYNAMICS(i)); 543 if (rv < 0) 544 return rv; 545 data->fan_dynamics[i] = rv; 546 } 547 548 return 0; 549 } 550 551 static int max31790_probe(struct i2c_client *client, 552 const struct i2c_device_id *id) 553 { 554 struct i2c_adapter *adapter = client->adapter; 555 struct device *dev = &client->dev; 556 struct max31790_data *data; 557 struct device *hwmon_dev; 558 int err; 559 560 if (!i2c_check_functionality(adapter, 561 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) 562 return -ENODEV; 563 564 data = devm_kzalloc(dev, sizeof(struct max31790_data), GFP_KERNEL); 565 if (!data) 566 return -ENOMEM; 567 568 data->client = client; 569 mutex_init(&data->update_lock); 570 571 /* 572 * Initialize the max31790 chip 573 */ 574 err = max31790_init_client(client, data); 575 if (err) 576 return err; 577 578 hwmon_dev = devm_hwmon_device_register_with_groups(dev, 579 client->name, data, max31790_groups); 580 581 return PTR_ERR_OR_ZERO(hwmon_dev); 582 } 583 584 static const struct i2c_device_id max31790_id[] = { 585 { "max31790", 0 }, 586 { } 587 }; 588 MODULE_DEVICE_TABLE(i2c, max31790_id); 589 590 static struct i2c_driver max31790_driver = { 591 .class = I2C_CLASS_HWMON, 592 .probe = max31790_probe, 593 .driver = { 594 .name = "max31790", 595 }, 596 .id_table = max31790_id, 597 }; 598 599 module_i2c_driver(max31790_driver); 600 601 MODULE_AUTHOR("Il Han <corone.il.han@gmail.com>"); 602 MODULE_DESCRIPTION("MAX31790 sensor driver"); 603 MODULE_LICENSE("GPL"); 604