1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * nct7802 - Driver for Nuvoton NCT7802Y 4 * 5 * Copyright (C) 2014 Guenter Roeck <linux@roeck-us.net> 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/err.h> 11 #include <linux/i2c.h> 12 #include <linux/init.h> 13 #include <linux/hwmon.h> 14 #include <linux/hwmon-sysfs.h> 15 #include <linux/jiffies.h> 16 #include <linux/module.h> 17 #include <linux/mutex.h> 18 #include <linux/regmap.h> 19 #include <linux/slab.h> 20 21 #define DRVNAME "nct7802" 22 23 static const u8 REG_VOLTAGE[5] = { 0x09, 0x0a, 0x0c, 0x0d, 0x0e }; 24 25 static const u8 REG_VOLTAGE_LIMIT_LSB[2][5] = { 26 { 0x46, 0x00, 0x40, 0x42, 0x44 }, 27 { 0x45, 0x00, 0x3f, 0x41, 0x43 }, 28 }; 29 30 static const u8 REG_VOLTAGE_LIMIT_MSB[5] = { 0x48, 0x00, 0x47, 0x47, 0x48 }; 31 32 static const u8 REG_VOLTAGE_LIMIT_MSB_SHIFT[2][5] = { 33 { 0, 0, 4, 0, 4 }, 34 { 2, 0, 6, 2, 6 }, 35 }; 36 37 #define REG_BANK 0x00 38 #define REG_TEMP_LSB 0x05 39 #define REG_TEMP_PECI_LSB 0x08 40 #define REG_VOLTAGE_LOW 0x0f 41 #define REG_FANCOUNT_LOW 0x13 42 #define REG_START 0x21 43 #define REG_MODE 0x22 /* 7.2.32 Mode Selection Register */ 44 #define REG_PECI_ENABLE 0x23 45 #define REG_FAN_ENABLE 0x24 46 #define REG_VMON_ENABLE 0x25 47 #define REG_PWM(x) (0x60 + (x)) 48 #define REG_SMARTFAN_EN(x) (0x64 + (x) / 2) 49 #define SMARTFAN_EN_SHIFT(x) ((x) % 2 * 4) 50 #define REG_VENDOR_ID 0xfd 51 #define REG_CHIP_ID 0xfe 52 #define REG_VERSION_ID 0xff 53 54 /* 55 * Data structures and manipulation thereof 56 */ 57 58 struct nct7802_data { 59 struct regmap *regmap; 60 struct mutex access_lock; /* for multi-byte read and write operations */ 61 u8 in_status; 62 struct mutex in_alarm_lock; 63 }; 64 65 static ssize_t temp_type_show(struct device *dev, 66 struct device_attribute *attr, char *buf) 67 { 68 struct nct7802_data *data = dev_get_drvdata(dev); 69 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr); 70 unsigned int mode; 71 int ret; 72 73 ret = regmap_read(data->regmap, REG_MODE, &mode); 74 if (ret < 0) 75 return ret; 76 77 return sprintf(buf, "%u\n", (mode >> (2 * sattr->index) & 3) + 2); 78 } 79 80 static ssize_t temp_type_store(struct device *dev, 81 struct device_attribute *attr, const char *buf, 82 size_t count) 83 { 84 struct nct7802_data *data = dev_get_drvdata(dev); 85 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr); 86 unsigned int type; 87 int err; 88 89 err = kstrtouint(buf, 0, &type); 90 if (err < 0) 91 return err; 92 if (sattr->index == 2 && type != 4) /* RD3 */ 93 return -EINVAL; 94 if (type < 3 || type > 4) 95 return -EINVAL; 96 err = regmap_update_bits(data->regmap, REG_MODE, 97 3 << 2 * sattr->index, (type - 2) << 2 * sattr->index); 98 return err ? : count; 99 } 100 101 static ssize_t pwm_mode_show(struct device *dev, 102 struct device_attribute *attr, char *buf) 103 { 104 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr); 105 struct nct7802_data *data = dev_get_drvdata(dev); 106 unsigned int regval; 107 int ret; 108 109 if (sattr->index > 1) 110 return sprintf(buf, "1\n"); 111 112 ret = regmap_read(data->regmap, 0x5E, ®val); 113 if (ret < 0) 114 return ret; 115 116 return sprintf(buf, "%u\n", !(regval & (1 << sattr->index))); 117 } 118 119 static ssize_t pwm_show(struct device *dev, struct device_attribute *devattr, 120 char *buf) 121 { 122 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 123 struct nct7802_data *data = dev_get_drvdata(dev); 124 unsigned int val; 125 int ret; 126 127 if (!attr->index) 128 return sprintf(buf, "255\n"); 129 130 ret = regmap_read(data->regmap, attr->index, &val); 131 if (ret < 0) 132 return ret; 133 134 return sprintf(buf, "%d\n", val); 135 } 136 137 static ssize_t pwm_store(struct device *dev, struct device_attribute *devattr, 138 const char *buf, size_t count) 139 { 140 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 141 struct nct7802_data *data = dev_get_drvdata(dev); 142 int err; 143 u8 val; 144 145 err = kstrtou8(buf, 0, &val); 146 if (err < 0) 147 return err; 148 149 err = regmap_write(data->regmap, attr->index, val); 150 return err ? : count; 151 } 152 153 static ssize_t pwm_enable_show(struct device *dev, 154 struct device_attribute *attr, char *buf) 155 { 156 struct nct7802_data *data = dev_get_drvdata(dev); 157 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr); 158 unsigned int reg, enabled; 159 int ret; 160 161 ret = regmap_read(data->regmap, REG_SMARTFAN_EN(sattr->index), ®); 162 if (ret < 0) 163 return ret; 164 enabled = reg >> SMARTFAN_EN_SHIFT(sattr->index) & 1; 165 return sprintf(buf, "%u\n", enabled + 1); 166 } 167 168 static ssize_t pwm_enable_store(struct device *dev, 169 struct device_attribute *attr, 170 const char *buf, size_t count) 171 { 172 struct nct7802_data *data = dev_get_drvdata(dev); 173 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr); 174 u8 val; 175 int ret; 176 177 ret = kstrtou8(buf, 0, &val); 178 if (ret < 0) 179 return ret; 180 if (val < 1 || val > 2) 181 return -EINVAL; 182 ret = regmap_update_bits(data->regmap, REG_SMARTFAN_EN(sattr->index), 183 1 << SMARTFAN_EN_SHIFT(sattr->index), 184 (val - 1) << SMARTFAN_EN_SHIFT(sattr->index)); 185 return ret ? : count; 186 } 187 188 static int nct7802_read_temp(struct nct7802_data *data, 189 u8 reg_temp, u8 reg_temp_low, int *temp) 190 { 191 unsigned int t1, t2 = 0; 192 int err; 193 194 *temp = 0; 195 196 mutex_lock(&data->access_lock); 197 err = regmap_read(data->regmap, reg_temp, &t1); 198 if (err < 0) 199 goto abort; 200 t1 <<= 8; 201 if (reg_temp_low) { /* 11 bit data */ 202 err = regmap_read(data->regmap, reg_temp_low, &t2); 203 if (err < 0) 204 goto abort; 205 } 206 t1 |= t2 & 0xe0; 207 *temp = (s16)t1 / 32 * 125; 208 abort: 209 mutex_unlock(&data->access_lock); 210 return err; 211 } 212 213 static int nct7802_read_fan(struct nct7802_data *data, u8 reg_fan) 214 { 215 unsigned int f1, f2; 216 int ret; 217 218 mutex_lock(&data->access_lock); 219 ret = regmap_read(data->regmap, reg_fan, &f1); 220 if (ret < 0) 221 goto abort; 222 ret = regmap_read(data->regmap, REG_FANCOUNT_LOW, &f2); 223 if (ret < 0) 224 goto abort; 225 ret = (f1 << 5) | (f2 >> 3); 226 /* convert fan count to rpm */ 227 if (ret == 0x1fff) /* maximum value, assume fan is stopped */ 228 ret = 0; 229 else if (ret) 230 ret = DIV_ROUND_CLOSEST(1350000U, ret); 231 abort: 232 mutex_unlock(&data->access_lock); 233 return ret; 234 } 235 236 static int nct7802_read_fan_min(struct nct7802_data *data, u8 reg_fan_low, 237 u8 reg_fan_high) 238 { 239 unsigned int f1, f2; 240 int ret; 241 242 mutex_lock(&data->access_lock); 243 ret = regmap_read(data->regmap, reg_fan_low, &f1); 244 if (ret < 0) 245 goto abort; 246 ret = regmap_read(data->regmap, reg_fan_high, &f2); 247 if (ret < 0) 248 goto abort; 249 ret = f1 | ((f2 & 0xf8) << 5); 250 /* convert fan count to rpm */ 251 if (ret == 0x1fff) /* maximum value, assume no limit */ 252 ret = 0; 253 else if (ret) 254 ret = DIV_ROUND_CLOSEST(1350000U, ret); 255 else 256 ret = 1350000U; 257 abort: 258 mutex_unlock(&data->access_lock); 259 return ret; 260 } 261 262 static int nct7802_write_fan_min(struct nct7802_data *data, u8 reg_fan_low, 263 u8 reg_fan_high, unsigned long limit) 264 { 265 int err; 266 267 if (limit) 268 limit = DIV_ROUND_CLOSEST(1350000U, limit); 269 else 270 limit = 0x1fff; 271 limit = clamp_val(limit, 0, 0x1fff); 272 273 mutex_lock(&data->access_lock); 274 err = regmap_write(data->regmap, reg_fan_low, limit & 0xff); 275 if (err < 0) 276 goto abort; 277 278 err = regmap_write(data->regmap, reg_fan_high, (limit & 0x1f00) >> 5); 279 abort: 280 mutex_unlock(&data->access_lock); 281 return err; 282 } 283 284 static u8 nct7802_vmul[] = { 4, 2, 2, 2, 2 }; 285 286 static int nct7802_read_voltage(struct nct7802_data *data, int nr, int index) 287 { 288 unsigned int v1, v2; 289 int ret; 290 291 mutex_lock(&data->access_lock); 292 if (index == 0) { /* voltage */ 293 ret = regmap_read(data->regmap, REG_VOLTAGE[nr], &v1); 294 if (ret < 0) 295 goto abort; 296 ret = regmap_read(data->regmap, REG_VOLTAGE_LOW, &v2); 297 if (ret < 0) 298 goto abort; 299 ret = ((v1 << 2) | (v2 >> 6)) * nct7802_vmul[nr]; 300 } else { /* limit */ 301 int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr]; 302 303 ret = regmap_read(data->regmap, 304 REG_VOLTAGE_LIMIT_LSB[index - 1][nr], &v1); 305 if (ret < 0) 306 goto abort; 307 ret = regmap_read(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr], 308 &v2); 309 if (ret < 0) 310 goto abort; 311 ret = (v1 | ((v2 << shift) & 0x300)) * nct7802_vmul[nr]; 312 } 313 abort: 314 mutex_unlock(&data->access_lock); 315 return ret; 316 } 317 318 static int nct7802_write_voltage(struct nct7802_data *data, int nr, int index, 319 unsigned long voltage) 320 { 321 int shift = 8 - REG_VOLTAGE_LIMIT_MSB_SHIFT[index - 1][nr]; 322 int err; 323 324 voltage = clamp_val(voltage, 0, 0x3ff * nct7802_vmul[nr]); 325 voltage = DIV_ROUND_CLOSEST(voltage, nct7802_vmul[nr]); 326 327 mutex_lock(&data->access_lock); 328 err = regmap_write(data->regmap, 329 REG_VOLTAGE_LIMIT_LSB[index - 1][nr], 330 voltage & 0xff); 331 if (err < 0) 332 goto abort; 333 334 err = regmap_update_bits(data->regmap, REG_VOLTAGE_LIMIT_MSB[nr], 335 0x0300 >> shift, (voltage & 0x0300) >> shift); 336 abort: 337 mutex_unlock(&data->access_lock); 338 return err; 339 } 340 341 static ssize_t in_show(struct device *dev, struct device_attribute *attr, 342 char *buf) 343 { 344 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 345 struct nct7802_data *data = dev_get_drvdata(dev); 346 int voltage; 347 348 voltage = nct7802_read_voltage(data, sattr->nr, sattr->index); 349 if (voltage < 0) 350 return voltage; 351 352 return sprintf(buf, "%d\n", voltage); 353 } 354 355 static ssize_t in_store(struct device *dev, struct device_attribute *attr, 356 const char *buf, size_t count) 357 { 358 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 359 struct nct7802_data *data = dev_get_drvdata(dev); 360 int index = sattr->index; 361 int nr = sattr->nr; 362 unsigned long val; 363 int err; 364 365 err = kstrtoul(buf, 10, &val); 366 if (err < 0) 367 return err; 368 369 err = nct7802_write_voltage(data, nr, index, val); 370 return err ? : count; 371 } 372 373 static ssize_t in_alarm_show(struct device *dev, struct device_attribute *attr, 374 char *buf) 375 { 376 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 377 struct nct7802_data *data = dev_get_drvdata(dev); 378 int volt, min, max, ret; 379 unsigned int val; 380 381 mutex_lock(&data->in_alarm_lock); 382 383 /* 384 * The SMI Voltage status register is the only register giving a status 385 * for voltages. A bit is set for each input crossing a threshold, in 386 * both direction, but the "inside" or "outside" limits info is not 387 * available. Also this register is cleared on read. 388 * Note: this is not explicitly spelled out in the datasheet, but 389 * from experiment. 390 * To deal with this we use a status cache with one validity bit and 391 * one status bit for each input. Validity is cleared at startup and 392 * each time the register reports a change, and the status is processed 393 * by software based on current input value and limits. 394 */ 395 ret = regmap_read(data->regmap, 0x1e, &val); /* SMI Voltage status */ 396 if (ret < 0) 397 goto abort; 398 399 /* invalidate cached status for all inputs crossing a threshold */ 400 data->in_status &= ~((val & 0x0f) << 4); 401 402 /* if cached status for requested input is invalid, update it */ 403 if (!(data->in_status & (0x10 << sattr->index))) { 404 ret = nct7802_read_voltage(data, sattr->nr, 0); 405 if (ret < 0) 406 goto abort; 407 volt = ret; 408 409 ret = nct7802_read_voltage(data, sattr->nr, 1); 410 if (ret < 0) 411 goto abort; 412 min = ret; 413 414 ret = nct7802_read_voltage(data, sattr->nr, 2); 415 if (ret < 0) 416 goto abort; 417 max = ret; 418 419 if (volt < min || volt > max) 420 data->in_status |= (1 << sattr->index); 421 else 422 data->in_status &= ~(1 << sattr->index); 423 424 data->in_status |= 0x10 << sattr->index; 425 } 426 427 ret = sprintf(buf, "%u\n", !!(data->in_status & (1 << sattr->index))); 428 abort: 429 mutex_unlock(&data->in_alarm_lock); 430 return ret; 431 } 432 433 static ssize_t temp_show(struct device *dev, struct device_attribute *attr, 434 char *buf) 435 { 436 struct nct7802_data *data = dev_get_drvdata(dev); 437 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 438 int err, temp; 439 440 err = nct7802_read_temp(data, sattr->nr, sattr->index, &temp); 441 if (err < 0) 442 return err; 443 444 return sprintf(buf, "%d\n", temp); 445 } 446 447 static ssize_t temp_store(struct device *dev, struct device_attribute *attr, 448 const char *buf, size_t count) 449 { 450 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 451 struct nct7802_data *data = dev_get_drvdata(dev); 452 int nr = sattr->nr; 453 long val; 454 int err; 455 456 err = kstrtol(buf, 10, &val); 457 if (err < 0) 458 return err; 459 460 val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000); 461 462 err = regmap_write(data->regmap, nr, val & 0xff); 463 return err ? : count; 464 } 465 466 static ssize_t fan_show(struct device *dev, struct device_attribute *attr, 467 char *buf) 468 { 469 struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr); 470 struct nct7802_data *data = dev_get_drvdata(dev); 471 int speed; 472 473 speed = nct7802_read_fan(data, sattr->index); 474 if (speed < 0) 475 return speed; 476 477 return sprintf(buf, "%d\n", speed); 478 } 479 480 static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr, 481 char *buf) 482 { 483 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 484 struct nct7802_data *data = dev_get_drvdata(dev); 485 int speed; 486 487 speed = nct7802_read_fan_min(data, sattr->nr, sattr->index); 488 if (speed < 0) 489 return speed; 490 491 return sprintf(buf, "%d\n", speed); 492 } 493 494 static ssize_t fan_min_store(struct device *dev, 495 struct device_attribute *attr, const char *buf, 496 size_t count) 497 { 498 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 499 struct nct7802_data *data = dev_get_drvdata(dev); 500 unsigned long val; 501 int err; 502 503 err = kstrtoul(buf, 10, &val); 504 if (err < 0) 505 return err; 506 507 err = nct7802_write_fan_min(data, sattr->nr, sattr->index, val); 508 return err ? : count; 509 } 510 511 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr, 512 char *buf) 513 { 514 struct nct7802_data *data = dev_get_drvdata(dev); 515 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 516 int bit = sattr->index; 517 unsigned int val; 518 int ret; 519 520 ret = regmap_read(data->regmap, sattr->nr, &val); 521 if (ret < 0) 522 return ret; 523 524 return sprintf(buf, "%u\n", !!(val & (1 << bit))); 525 } 526 527 static ssize_t 528 beep_show(struct device *dev, struct device_attribute *attr, char *buf) 529 { 530 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 531 struct nct7802_data *data = dev_get_drvdata(dev); 532 unsigned int regval; 533 int err; 534 535 err = regmap_read(data->regmap, sattr->nr, ®val); 536 if (err) 537 return err; 538 539 return sprintf(buf, "%u\n", !!(regval & (1 << sattr->index))); 540 } 541 542 static ssize_t 543 beep_store(struct device *dev, struct device_attribute *attr, const char *buf, 544 size_t count) 545 { 546 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 547 struct nct7802_data *data = dev_get_drvdata(dev); 548 unsigned long val; 549 int err; 550 551 err = kstrtoul(buf, 10, &val); 552 if (err < 0) 553 return err; 554 if (val > 1) 555 return -EINVAL; 556 557 err = regmap_update_bits(data->regmap, sattr->nr, 1 << sattr->index, 558 val ? 1 << sattr->index : 0); 559 return err ? : count; 560 } 561 562 static SENSOR_DEVICE_ATTR_RW(temp1_type, temp_type, 0); 563 static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0x01, REG_TEMP_LSB); 564 static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 0x31, 0); 565 static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0x30, 0); 566 static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0x3a, 0); 567 568 static SENSOR_DEVICE_ATTR_RW(temp2_type, temp_type, 1); 569 static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 0x02, REG_TEMP_LSB); 570 static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 0x33, 0); 571 static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 0x32, 0); 572 static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 0x3b, 0); 573 574 static SENSOR_DEVICE_ATTR_RW(temp3_type, temp_type, 2); 575 static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 0x03, REG_TEMP_LSB); 576 static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 0x35, 0); 577 static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 0x34, 0); 578 static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 0x3c, 0); 579 580 static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 0x04, 0); 581 static SENSOR_DEVICE_ATTR_2_RW(temp4_min, temp, 0x37, 0); 582 static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 0x36, 0); 583 static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 0x3d, 0); 584 585 static SENSOR_DEVICE_ATTR_2_RO(temp5_input, temp, 0x06, REG_TEMP_PECI_LSB); 586 static SENSOR_DEVICE_ATTR_2_RW(temp5_min, temp, 0x39, 0); 587 static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 0x38, 0); 588 static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 0x3e, 0); 589 590 static SENSOR_DEVICE_ATTR_2_RO(temp6_input, temp, 0x07, REG_TEMP_PECI_LSB); 591 592 static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, alarm, 0x18, 0); 593 static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, alarm, 0x18, 1); 594 static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, alarm, 0x18, 2); 595 static SENSOR_DEVICE_ATTR_2_RO(temp4_min_alarm, alarm, 0x18, 3); 596 static SENSOR_DEVICE_ATTR_2_RO(temp5_min_alarm, alarm, 0x18, 4); 597 598 static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, alarm, 0x19, 0); 599 static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, alarm, 0x19, 1); 600 static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, alarm, 0x19, 2); 601 static SENSOR_DEVICE_ATTR_2_RO(temp4_max_alarm, alarm, 0x19, 3); 602 static SENSOR_DEVICE_ATTR_2_RO(temp5_max_alarm, alarm, 0x19, 4); 603 604 static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, alarm, 0x1b, 0); 605 static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, alarm, 0x1b, 1); 606 static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, alarm, 0x1b, 2); 607 static SENSOR_DEVICE_ATTR_2_RO(temp4_crit_alarm, alarm, 0x1b, 3); 608 static SENSOR_DEVICE_ATTR_2_RO(temp5_crit_alarm, alarm, 0x1b, 4); 609 610 static SENSOR_DEVICE_ATTR_2_RO(temp1_fault, alarm, 0x17, 0); 611 static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, alarm, 0x17, 1); 612 static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, alarm, 0x17, 2); 613 614 static SENSOR_DEVICE_ATTR_2_RW(temp1_beep, beep, 0x5c, 0); 615 static SENSOR_DEVICE_ATTR_2_RW(temp2_beep, beep, 0x5c, 1); 616 static SENSOR_DEVICE_ATTR_2_RW(temp3_beep, beep, 0x5c, 2); 617 static SENSOR_DEVICE_ATTR_2_RW(temp4_beep, beep, 0x5c, 3); 618 static SENSOR_DEVICE_ATTR_2_RW(temp5_beep, beep, 0x5c, 4); 619 static SENSOR_DEVICE_ATTR_2_RW(temp6_beep, beep, 0x5c, 5); 620 621 static struct attribute *nct7802_temp_attrs[] = { 622 &sensor_dev_attr_temp1_type.dev_attr.attr, 623 &sensor_dev_attr_temp1_input.dev_attr.attr, 624 &sensor_dev_attr_temp1_min.dev_attr.attr, 625 &sensor_dev_attr_temp1_max.dev_attr.attr, 626 &sensor_dev_attr_temp1_crit.dev_attr.attr, 627 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, 628 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, 629 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, 630 &sensor_dev_attr_temp1_fault.dev_attr.attr, 631 &sensor_dev_attr_temp1_beep.dev_attr.attr, 632 633 &sensor_dev_attr_temp2_type.dev_attr.attr, /* 10 */ 634 &sensor_dev_attr_temp2_input.dev_attr.attr, 635 &sensor_dev_attr_temp2_min.dev_attr.attr, 636 &sensor_dev_attr_temp2_max.dev_attr.attr, 637 &sensor_dev_attr_temp2_crit.dev_attr.attr, 638 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, 639 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, 640 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, 641 &sensor_dev_attr_temp2_fault.dev_attr.attr, 642 &sensor_dev_attr_temp2_beep.dev_attr.attr, 643 644 &sensor_dev_attr_temp3_type.dev_attr.attr, /* 20 */ 645 &sensor_dev_attr_temp3_input.dev_attr.attr, 646 &sensor_dev_attr_temp3_min.dev_attr.attr, 647 &sensor_dev_attr_temp3_max.dev_attr.attr, 648 &sensor_dev_attr_temp3_crit.dev_attr.attr, 649 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr, 650 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, 651 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr, 652 &sensor_dev_attr_temp3_fault.dev_attr.attr, 653 &sensor_dev_attr_temp3_beep.dev_attr.attr, 654 655 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 30 */ 656 &sensor_dev_attr_temp4_min.dev_attr.attr, 657 &sensor_dev_attr_temp4_max.dev_attr.attr, 658 &sensor_dev_attr_temp4_crit.dev_attr.attr, 659 &sensor_dev_attr_temp4_min_alarm.dev_attr.attr, 660 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr, 661 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr, 662 &sensor_dev_attr_temp4_beep.dev_attr.attr, 663 664 &sensor_dev_attr_temp5_input.dev_attr.attr, /* 38 */ 665 &sensor_dev_attr_temp5_min.dev_attr.attr, 666 &sensor_dev_attr_temp5_max.dev_attr.attr, 667 &sensor_dev_attr_temp5_crit.dev_attr.attr, 668 &sensor_dev_attr_temp5_min_alarm.dev_attr.attr, 669 &sensor_dev_attr_temp5_max_alarm.dev_attr.attr, 670 &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr, 671 &sensor_dev_attr_temp5_beep.dev_attr.attr, 672 673 &sensor_dev_attr_temp6_input.dev_attr.attr, /* 46 */ 674 &sensor_dev_attr_temp6_beep.dev_attr.attr, 675 676 NULL 677 }; 678 679 static umode_t nct7802_temp_is_visible(struct kobject *kobj, 680 struct attribute *attr, int index) 681 { 682 struct device *dev = kobj_to_dev(kobj); 683 struct nct7802_data *data = dev_get_drvdata(dev); 684 unsigned int reg; 685 int err; 686 687 err = regmap_read(data->regmap, REG_MODE, ®); 688 if (err < 0) 689 return 0; 690 691 if (index < 10 && 692 (reg & 03) != 0x01 && (reg & 0x03) != 0x02) /* RD1 */ 693 return 0; 694 695 if (index >= 10 && index < 20 && 696 (reg & 0x0c) != 0x04 && (reg & 0x0c) != 0x08) /* RD2 */ 697 return 0; 698 if (index >= 20 && index < 30 && (reg & 0x30) != 0x20) /* RD3 */ 699 return 0; 700 701 if (index >= 30 && index < 38) /* local */ 702 return attr->mode; 703 704 err = regmap_read(data->regmap, REG_PECI_ENABLE, ®); 705 if (err < 0) 706 return 0; 707 708 if (index >= 38 && index < 46 && !(reg & 0x01)) /* PECI 0 */ 709 return 0; 710 711 if (index >= 0x46 && (!(reg & 0x02))) /* PECI 1 */ 712 return 0; 713 714 return attr->mode; 715 } 716 717 static const struct attribute_group nct7802_temp_group = { 718 .attrs = nct7802_temp_attrs, 719 .is_visible = nct7802_temp_is_visible, 720 }; 721 722 static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, 0); 723 static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, 1); 724 static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, 2); 725 static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, in_alarm, 0, 3); 726 static SENSOR_DEVICE_ATTR_2_RW(in0_beep, beep, 0x5a, 3); 727 728 static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, 0); 729 730 static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, 0); 731 static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, 1); 732 static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, 2); 733 static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, in_alarm, 2, 0); 734 static SENSOR_DEVICE_ATTR_2_RW(in2_beep, beep, 0x5a, 0); 735 736 static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, 0); 737 static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, 1); 738 static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, 2); 739 static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, in_alarm, 3, 1); 740 static SENSOR_DEVICE_ATTR_2_RW(in3_beep, beep, 0x5a, 1); 741 742 static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, 0); 743 static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, 1); 744 static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, 2); 745 static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, in_alarm, 4, 2); 746 static SENSOR_DEVICE_ATTR_2_RW(in4_beep, beep, 0x5a, 2); 747 748 static struct attribute *nct7802_in_attrs[] = { 749 &sensor_dev_attr_in0_input.dev_attr.attr, 750 &sensor_dev_attr_in0_min.dev_attr.attr, 751 &sensor_dev_attr_in0_max.dev_attr.attr, 752 &sensor_dev_attr_in0_alarm.dev_attr.attr, 753 &sensor_dev_attr_in0_beep.dev_attr.attr, 754 755 &sensor_dev_attr_in1_input.dev_attr.attr, /* 5 */ 756 757 &sensor_dev_attr_in2_input.dev_attr.attr, /* 6 */ 758 &sensor_dev_attr_in2_min.dev_attr.attr, 759 &sensor_dev_attr_in2_max.dev_attr.attr, 760 &sensor_dev_attr_in2_alarm.dev_attr.attr, 761 &sensor_dev_attr_in2_beep.dev_attr.attr, 762 763 &sensor_dev_attr_in3_input.dev_attr.attr, /* 11 */ 764 &sensor_dev_attr_in3_min.dev_attr.attr, 765 &sensor_dev_attr_in3_max.dev_attr.attr, 766 &sensor_dev_attr_in3_alarm.dev_attr.attr, 767 &sensor_dev_attr_in3_beep.dev_attr.attr, 768 769 &sensor_dev_attr_in4_input.dev_attr.attr, /* 16 */ 770 &sensor_dev_attr_in4_min.dev_attr.attr, 771 &sensor_dev_attr_in4_max.dev_attr.attr, 772 &sensor_dev_attr_in4_alarm.dev_attr.attr, 773 &sensor_dev_attr_in4_beep.dev_attr.attr, 774 775 NULL, 776 }; 777 778 static umode_t nct7802_in_is_visible(struct kobject *kobj, 779 struct attribute *attr, int index) 780 { 781 struct device *dev = kobj_to_dev(kobj); 782 struct nct7802_data *data = dev_get_drvdata(dev); 783 unsigned int reg; 784 int err; 785 786 if (index < 6) /* VCC, VCORE */ 787 return attr->mode; 788 789 err = regmap_read(data->regmap, REG_MODE, ®); 790 if (err < 0) 791 return 0; 792 793 if (index >= 6 && index < 11 && (reg & 0x03) != 0x03) /* VSEN1 */ 794 return 0; 795 if (index >= 11 && index < 16 && (reg & 0x0c) != 0x0c) /* VSEN2 */ 796 return 0; 797 if (index >= 16 && (reg & 0x30) != 0x30) /* VSEN3 */ 798 return 0; 799 800 return attr->mode; 801 } 802 803 static const struct attribute_group nct7802_in_group = { 804 .attrs = nct7802_in_attrs, 805 .is_visible = nct7802_in_is_visible, 806 }; 807 808 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0x10); 809 static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan_min, 0x49, 0x4c); 810 static SENSOR_DEVICE_ATTR_2_RO(fan1_alarm, alarm, 0x1a, 0); 811 static SENSOR_DEVICE_ATTR_2_RW(fan1_beep, beep, 0x5b, 0); 812 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 0x11); 813 static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan_min, 0x4a, 0x4d); 814 static SENSOR_DEVICE_ATTR_2_RO(fan2_alarm, alarm, 0x1a, 1); 815 static SENSOR_DEVICE_ATTR_2_RW(fan2_beep, beep, 0x5b, 1); 816 static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 0x12); 817 static SENSOR_DEVICE_ATTR_2_RW(fan3_min, fan_min, 0x4b, 0x4e); 818 static SENSOR_DEVICE_ATTR_2_RO(fan3_alarm, alarm, 0x1a, 2); 819 static SENSOR_DEVICE_ATTR_2_RW(fan3_beep, beep, 0x5b, 2); 820 821 /* 7.2.89 Fan Control Output Type */ 822 static SENSOR_DEVICE_ATTR_RO(pwm1_mode, pwm_mode, 0); 823 static SENSOR_DEVICE_ATTR_RO(pwm2_mode, pwm_mode, 1); 824 static SENSOR_DEVICE_ATTR_RO(pwm3_mode, pwm_mode, 2); 825 826 /* 7.2.91... Fan Control Output Value */ 827 static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, REG_PWM(0)); 828 static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, REG_PWM(1)); 829 static SENSOR_DEVICE_ATTR_RW(pwm3, pwm, REG_PWM(2)); 830 831 /* 7.2.95... Temperature to Fan mapping Relationships Register */ 832 static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm_enable, 0); 833 static SENSOR_DEVICE_ATTR_RW(pwm2_enable, pwm_enable, 1); 834 static SENSOR_DEVICE_ATTR_RW(pwm3_enable, pwm_enable, 2); 835 836 static struct attribute *nct7802_fan_attrs[] = { 837 &sensor_dev_attr_fan1_input.dev_attr.attr, 838 &sensor_dev_attr_fan1_min.dev_attr.attr, 839 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 840 &sensor_dev_attr_fan1_beep.dev_attr.attr, 841 &sensor_dev_attr_fan2_input.dev_attr.attr, 842 &sensor_dev_attr_fan2_min.dev_attr.attr, 843 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 844 &sensor_dev_attr_fan2_beep.dev_attr.attr, 845 &sensor_dev_attr_fan3_input.dev_attr.attr, 846 &sensor_dev_attr_fan3_min.dev_attr.attr, 847 &sensor_dev_attr_fan3_alarm.dev_attr.attr, 848 &sensor_dev_attr_fan3_beep.dev_attr.attr, 849 850 NULL 851 }; 852 853 static umode_t nct7802_fan_is_visible(struct kobject *kobj, 854 struct attribute *attr, int index) 855 { 856 struct device *dev = kobj_to_dev(kobj); 857 struct nct7802_data *data = dev_get_drvdata(dev); 858 int fan = index / 4; /* 4 attributes per fan */ 859 unsigned int reg; 860 int err; 861 862 err = regmap_read(data->regmap, REG_FAN_ENABLE, ®); 863 if (err < 0 || !(reg & (1 << fan))) 864 return 0; 865 866 return attr->mode; 867 } 868 869 static const struct attribute_group nct7802_fan_group = { 870 .attrs = nct7802_fan_attrs, 871 .is_visible = nct7802_fan_is_visible, 872 }; 873 874 static struct attribute *nct7802_pwm_attrs[] = { 875 &sensor_dev_attr_pwm1_enable.dev_attr.attr, 876 &sensor_dev_attr_pwm1_mode.dev_attr.attr, 877 &sensor_dev_attr_pwm1.dev_attr.attr, 878 &sensor_dev_attr_pwm2_enable.dev_attr.attr, 879 &sensor_dev_attr_pwm2_mode.dev_attr.attr, 880 &sensor_dev_attr_pwm2.dev_attr.attr, 881 &sensor_dev_attr_pwm3_enable.dev_attr.attr, 882 &sensor_dev_attr_pwm3_mode.dev_attr.attr, 883 &sensor_dev_attr_pwm3.dev_attr.attr, 884 NULL 885 }; 886 887 static const struct attribute_group nct7802_pwm_group = { 888 .attrs = nct7802_pwm_attrs, 889 }; 890 891 /* 7.2.115... 0x80-0x83, 0x84 Temperature (X-axis) transition */ 892 static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point1_temp, temp, 0x80, 0); 893 static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point2_temp, temp, 0x81, 0); 894 static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point3_temp, temp, 0x82, 0); 895 static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point4_temp, temp, 0x83, 0); 896 static SENSOR_DEVICE_ATTR_2_RW(pwm1_auto_point5_temp, temp, 0x84, 0); 897 898 /* 7.2.120... 0x85-0x88 PWM (Y-axis) transition */ 899 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_pwm, pwm, 0x85); 900 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm, 0x86); 901 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point3_pwm, pwm, 0x87); 902 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point4_pwm, pwm, 0x88); 903 static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point5_pwm, pwm, 0); 904 905 /* 7.2.124 Table 2 X-axis Transition Point 1 Register */ 906 static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point1_temp, temp, 0x90, 0); 907 static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point2_temp, temp, 0x91, 0); 908 static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point3_temp, temp, 0x92, 0); 909 static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point4_temp, temp, 0x93, 0); 910 static SENSOR_DEVICE_ATTR_2_RW(pwm2_auto_point5_temp, temp, 0x94, 0); 911 912 /* 7.2.129 Table 2 Y-axis Transition Point 1 Register */ 913 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point1_pwm, pwm, 0x95); 914 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point2_pwm, pwm, 0x96); 915 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point3_pwm, pwm, 0x97); 916 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point4_pwm, pwm, 0x98); 917 static SENSOR_DEVICE_ATTR_RO(pwm2_auto_point5_pwm, pwm, 0); 918 919 /* 7.2.133 Table 3 X-axis Transition Point 1 Register */ 920 static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point1_temp, temp, 0xA0, 0); 921 static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point2_temp, temp, 0xA1, 0); 922 static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point3_temp, temp, 0xA2, 0); 923 static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point4_temp, temp, 0xA3, 0); 924 static SENSOR_DEVICE_ATTR_2_RW(pwm3_auto_point5_temp, temp, 0xA4, 0); 925 926 /* 7.2.138 Table 3 Y-axis Transition Point 1 Register */ 927 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point1_pwm, pwm, 0xA5); 928 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point2_pwm, pwm, 0xA6); 929 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point3_pwm, pwm, 0xA7); 930 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point4_pwm, pwm, 0xA8); 931 static SENSOR_DEVICE_ATTR_RO(pwm3_auto_point5_pwm, pwm, 0); 932 933 static struct attribute *nct7802_auto_point_attrs[] = { 934 &sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr, 935 &sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr, 936 &sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr, 937 &sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr, 938 &sensor_dev_attr_pwm1_auto_point5_temp.dev_attr.attr, 939 940 &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr, 941 &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr, 942 &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr, 943 &sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr, 944 &sensor_dev_attr_pwm1_auto_point5_pwm.dev_attr.attr, 945 946 &sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr, 947 &sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr, 948 &sensor_dev_attr_pwm2_auto_point3_temp.dev_attr.attr, 949 &sensor_dev_attr_pwm2_auto_point4_temp.dev_attr.attr, 950 &sensor_dev_attr_pwm2_auto_point5_temp.dev_attr.attr, 951 952 &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr, 953 &sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr, 954 &sensor_dev_attr_pwm2_auto_point3_pwm.dev_attr.attr, 955 &sensor_dev_attr_pwm2_auto_point4_pwm.dev_attr.attr, 956 &sensor_dev_attr_pwm2_auto_point5_pwm.dev_attr.attr, 957 958 &sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr, 959 &sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr, 960 &sensor_dev_attr_pwm3_auto_point3_temp.dev_attr.attr, 961 &sensor_dev_attr_pwm3_auto_point4_temp.dev_attr.attr, 962 &sensor_dev_attr_pwm3_auto_point5_temp.dev_attr.attr, 963 964 &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr, 965 &sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr, 966 &sensor_dev_attr_pwm3_auto_point3_pwm.dev_attr.attr, 967 &sensor_dev_attr_pwm3_auto_point4_pwm.dev_attr.attr, 968 &sensor_dev_attr_pwm3_auto_point5_pwm.dev_attr.attr, 969 970 NULL 971 }; 972 973 static const struct attribute_group nct7802_auto_point_group = { 974 .attrs = nct7802_auto_point_attrs, 975 }; 976 977 static const struct attribute_group *nct7802_groups[] = { 978 &nct7802_temp_group, 979 &nct7802_in_group, 980 &nct7802_fan_group, 981 &nct7802_pwm_group, 982 &nct7802_auto_point_group, 983 NULL 984 }; 985 986 static int nct7802_detect(struct i2c_client *client, 987 struct i2c_board_info *info) 988 { 989 int reg; 990 991 /* 992 * Chip identification registers are only available in bank 0, 993 * so only attempt chip detection if bank 0 is selected 994 */ 995 reg = i2c_smbus_read_byte_data(client, REG_BANK); 996 if (reg != 0x00) 997 return -ENODEV; 998 999 reg = i2c_smbus_read_byte_data(client, REG_VENDOR_ID); 1000 if (reg != 0x50) 1001 return -ENODEV; 1002 1003 reg = i2c_smbus_read_byte_data(client, REG_CHIP_ID); 1004 if (reg != 0xc3) 1005 return -ENODEV; 1006 1007 reg = i2c_smbus_read_byte_data(client, REG_VERSION_ID); 1008 if (reg < 0 || (reg & 0xf0) != 0x20) 1009 return -ENODEV; 1010 1011 /* Also validate lower bits of voltage and temperature registers */ 1012 reg = i2c_smbus_read_byte_data(client, REG_TEMP_LSB); 1013 if (reg < 0 || (reg & 0x1f)) 1014 return -ENODEV; 1015 1016 reg = i2c_smbus_read_byte_data(client, REG_TEMP_PECI_LSB); 1017 if (reg < 0 || (reg & 0x3f)) 1018 return -ENODEV; 1019 1020 reg = i2c_smbus_read_byte_data(client, REG_VOLTAGE_LOW); 1021 if (reg < 0 || (reg & 0x3f)) 1022 return -ENODEV; 1023 1024 strlcpy(info->type, "nct7802", I2C_NAME_SIZE); 1025 return 0; 1026 } 1027 1028 static bool nct7802_regmap_is_volatile(struct device *dev, unsigned int reg) 1029 { 1030 return (reg != REG_BANK && reg <= 0x20) || 1031 (reg >= REG_PWM(0) && reg <= REG_PWM(2)); 1032 } 1033 1034 static const struct regmap_config nct7802_regmap_config = { 1035 .reg_bits = 8, 1036 .val_bits = 8, 1037 .cache_type = REGCACHE_RBTREE, 1038 .volatile_reg = nct7802_regmap_is_volatile, 1039 }; 1040 1041 static int nct7802_init_chip(struct nct7802_data *data) 1042 { 1043 int err; 1044 1045 /* Enable ADC */ 1046 err = regmap_update_bits(data->regmap, REG_START, 0x01, 0x01); 1047 if (err) 1048 return err; 1049 1050 /* Enable local temperature sensor */ 1051 err = regmap_update_bits(data->regmap, REG_MODE, 0x40, 0x40); 1052 if (err) 1053 return err; 1054 1055 /* Enable Vcore and VCC voltage monitoring */ 1056 return regmap_update_bits(data->regmap, REG_VMON_ENABLE, 0x03, 0x03); 1057 } 1058 1059 static int nct7802_probe(struct i2c_client *client, 1060 const struct i2c_device_id *id) 1061 { 1062 struct device *dev = &client->dev; 1063 struct nct7802_data *data; 1064 struct device *hwmon_dev; 1065 int ret; 1066 1067 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 1068 if (data == NULL) 1069 return -ENOMEM; 1070 1071 data->regmap = devm_regmap_init_i2c(client, &nct7802_regmap_config); 1072 if (IS_ERR(data->regmap)) 1073 return PTR_ERR(data->regmap); 1074 1075 mutex_init(&data->access_lock); 1076 mutex_init(&data->in_alarm_lock); 1077 1078 ret = nct7802_init_chip(data); 1079 if (ret < 0) 1080 return ret; 1081 1082 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 1083 data, 1084 nct7802_groups); 1085 return PTR_ERR_OR_ZERO(hwmon_dev); 1086 } 1087 1088 static const unsigned short nct7802_address_list[] = { 1089 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END 1090 }; 1091 1092 static const struct i2c_device_id nct7802_idtable[] = { 1093 { "nct7802", 0 }, 1094 { } 1095 }; 1096 MODULE_DEVICE_TABLE(i2c, nct7802_idtable); 1097 1098 static struct i2c_driver nct7802_driver = { 1099 .class = I2C_CLASS_HWMON, 1100 .driver = { 1101 .name = DRVNAME, 1102 }, 1103 .detect = nct7802_detect, 1104 .probe = nct7802_probe, 1105 .id_table = nct7802_idtable, 1106 .address_list = nct7802_address_list, 1107 }; 1108 1109 module_i2c_driver(nct7802_driver); 1110 1111 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); 1112 MODULE_DESCRIPTION("NCT7802Y Hardware Monitoring Driver"); 1113 MODULE_LICENSE("GPL v2"); 1114