1 /* 2 * Hardware monitoring driver for PMBus devices 3 * 4 * Copyright (c) 2010, 2011 Ericsson AB. 5 * Copyright (c) 2012 Guenter Roeck 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 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 #include <linux/kernel.h> 23 #include <linux/module.h> 24 #include <linux/init.h> 25 #include <linux/err.h> 26 #include <linux/slab.h> 27 #include <linux/i2c.h> 28 #include <linux/hwmon.h> 29 #include <linux/hwmon-sysfs.h> 30 #include <linux/jiffies.h> 31 #include <linux/i2c/pmbus.h> 32 #include <linux/regulator/driver.h> 33 #include <linux/regulator/machine.h> 34 #include "pmbus.h" 35 36 /* 37 * Number of additional attribute pointers to allocate 38 * with each call to krealloc 39 */ 40 #define PMBUS_ATTR_ALLOC_SIZE 32 41 42 /* 43 * Index into status register array, per status register group 44 */ 45 #define PB_STATUS_BASE 0 46 #define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES) 47 #define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES) 48 #define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES) 49 #define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES) 50 #define PB_STATUS_TEMP_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES) 51 #define PB_STATUS_INPUT_BASE (PB_STATUS_TEMP_BASE + PMBUS_PAGES) 52 #define PB_STATUS_VMON_BASE (PB_STATUS_INPUT_BASE + 1) 53 54 #define PB_NUM_STATUS_REG (PB_STATUS_VMON_BASE + 1) 55 56 #define PMBUS_NAME_SIZE 24 57 58 struct pmbus_sensor { 59 struct pmbus_sensor *next; 60 char name[PMBUS_NAME_SIZE]; /* sysfs sensor name */ 61 struct device_attribute attribute; 62 u8 page; /* page number */ 63 u16 reg; /* register */ 64 enum pmbus_sensor_classes class; /* sensor class */ 65 bool update; /* runtime sensor update needed */ 66 int data; /* Sensor data. 67 Negative if there was a read error */ 68 }; 69 #define to_pmbus_sensor(_attr) \ 70 container_of(_attr, struct pmbus_sensor, attribute) 71 72 struct pmbus_boolean { 73 char name[PMBUS_NAME_SIZE]; /* sysfs boolean name */ 74 struct sensor_device_attribute attribute; 75 struct pmbus_sensor *s1; 76 struct pmbus_sensor *s2; 77 }; 78 #define to_pmbus_boolean(_attr) \ 79 container_of(_attr, struct pmbus_boolean, attribute) 80 81 struct pmbus_label { 82 char name[PMBUS_NAME_SIZE]; /* sysfs label name */ 83 struct device_attribute attribute; 84 char label[PMBUS_NAME_SIZE]; /* label */ 85 }; 86 #define to_pmbus_label(_attr) \ 87 container_of(_attr, struct pmbus_label, attribute) 88 89 struct pmbus_data { 90 struct device *dev; 91 struct device *hwmon_dev; 92 93 u32 flags; /* from platform data */ 94 95 int exponent[PMBUS_PAGES]; 96 /* linear mode: exponent for output voltages */ 97 98 const struct pmbus_driver_info *info; 99 100 int max_attributes; 101 int num_attributes; 102 struct attribute_group group; 103 const struct attribute_group *groups[2]; 104 105 struct pmbus_sensor *sensors; 106 107 struct mutex update_lock; 108 bool valid; 109 unsigned long last_updated; /* in jiffies */ 110 111 /* 112 * A single status register covers multiple attributes, 113 * so we keep them all together. 114 */ 115 u8 status[PB_NUM_STATUS_REG]; 116 u8 status_register; 117 118 u8 currpage; 119 }; 120 121 void pmbus_clear_cache(struct i2c_client *client) 122 { 123 struct pmbus_data *data = i2c_get_clientdata(client); 124 125 data->valid = false; 126 } 127 EXPORT_SYMBOL_GPL(pmbus_clear_cache); 128 129 int pmbus_set_page(struct i2c_client *client, u8 page) 130 { 131 struct pmbus_data *data = i2c_get_clientdata(client); 132 int rv = 0; 133 int newpage; 134 135 if (page != data->currpage) { 136 rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page); 137 newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE); 138 if (newpage != page) 139 rv = -EIO; 140 else 141 data->currpage = page; 142 } 143 return rv; 144 } 145 EXPORT_SYMBOL_GPL(pmbus_set_page); 146 147 int pmbus_write_byte(struct i2c_client *client, int page, u8 value) 148 { 149 int rv; 150 151 if (page >= 0) { 152 rv = pmbus_set_page(client, page); 153 if (rv < 0) 154 return rv; 155 } 156 157 return i2c_smbus_write_byte(client, value); 158 } 159 EXPORT_SYMBOL_GPL(pmbus_write_byte); 160 161 /* 162 * _pmbus_write_byte() is similar to pmbus_write_byte(), but checks if 163 * a device specific mapping function exists and calls it if necessary. 164 */ 165 static int _pmbus_write_byte(struct i2c_client *client, int page, u8 value) 166 { 167 struct pmbus_data *data = i2c_get_clientdata(client); 168 const struct pmbus_driver_info *info = data->info; 169 int status; 170 171 if (info->write_byte) { 172 status = info->write_byte(client, page, value); 173 if (status != -ENODATA) 174 return status; 175 } 176 return pmbus_write_byte(client, page, value); 177 } 178 179 int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word) 180 { 181 int rv; 182 183 rv = pmbus_set_page(client, page); 184 if (rv < 0) 185 return rv; 186 187 return i2c_smbus_write_word_data(client, reg, word); 188 } 189 EXPORT_SYMBOL_GPL(pmbus_write_word_data); 190 191 /* 192 * _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if 193 * a device specific mapping function exists and calls it if necessary. 194 */ 195 static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg, 196 u16 word) 197 { 198 struct pmbus_data *data = i2c_get_clientdata(client); 199 const struct pmbus_driver_info *info = data->info; 200 int status; 201 202 if (info->write_word_data) { 203 status = info->write_word_data(client, page, reg, word); 204 if (status != -ENODATA) 205 return status; 206 } 207 if (reg >= PMBUS_VIRT_BASE) 208 return -ENXIO; 209 return pmbus_write_word_data(client, page, reg, word); 210 } 211 212 int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg) 213 { 214 int rv; 215 216 rv = pmbus_set_page(client, page); 217 if (rv < 0) 218 return rv; 219 220 return i2c_smbus_read_word_data(client, reg); 221 } 222 EXPORT_SYMBOL_GPL(pmbus_read_word_data); 223 224 /* 225 * _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if 226 * a device specific mapping function exists and calls it if necessary. 227 */ 228 static int _pmbus_read_word_data(struct i2c_client *client, int page, int reg) 229 { 230 struct pmbus_data *data = i2c_get_clientdata(client); 231 const struct pmbus_driver_info *info = data->info; 232 int status; 233 234 if (info->read_word_data) { 235 status = info->read_word_data(client, page, reg); 236 if (status != -ENODATA) 237 return status; 238 } 239 if (reg >= PMBUS_VIRT_BASE) 240 return -ENXIO; 241 return pmbus_read_word_data(client, page, reg); 242 } 243 244 int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg) 245 { 246 int rv; 247 248 if (page >= 0) { 249 rv = pmbus_set_page(client, page); 250 if (rv < 0) 251 return rv; 252 } 253 254 return i2c_smbus_read_byte_data(client, reg); 255 } 256 EXPORT_SYMBOL_GPL(pmbus_read_byte_data); 257 258 int pmbus_write_byte_data(struct i2c_client *client, int page, u8 reg, u8 value) 259 { 260 int rv; 261 262 rv = pmbus_set_page(client, page); 263 if (rv < 0) 264 return rv; 265 266 return i2c_smbus_write_byte_data(client, reg, value); 267 } 268 EXPORT_SYMBOL_GPL(pmbus_write_byte_data); 269 270 int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg, 271 u8 mask, u8 value) 272 { 273 unsigned int tmp; 274 int rv; 275 276 rv = pmbus_read_byte_data(client, page, reg); 277 if (rv < 0) 278 return rv; 279 280 tmp = (rv & ~mask) | (value & mask); 281 282 if (tmp != rv) 283 rv = pmbus_write_byte_data(client, page, reg, tmp); 284 285 return rv; 286 } 287 EXPORT_SYMBOL_GPL(pmbus_update_byte_data); 288 289 /* 290 * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if 291 * a device specific mapping function exists and calls it if necessary. 292 */ 293 static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg) 294 { 295 struct pmbus_data *data = i2c_get_clientdata(client); 296 const struct pmbus_driver_info *info = data->info; 297 int status; 298 299 if (info->read_byte_data) { 300 status = info->read_byte_data(client, page, reg); 301 if (status != -ENODATA) 302 return status; 303 } 304 return pmbus_read_byte_data(client, page, reg); 305 } 306 307 static void pmbus_clear_fault_page(struct i2c_client *client, int page) 308 { 309 _pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS); 310 } 311 312 void pmbus_clear_faults(struct i2c_client *client) 313 { 314 struct pmbus_data *data = i2c_get_clientdata(client); 315 int i; 316 317 for (i = 0; i < data->info->pages; i++) 318 pmbus_clear_fault_page(client, i); 319 } 320 EXPORT_SYMBOL_GPL(pmbus_clear_faults); 321 322 static int pmbus_check_status_cml(struct i2c_client *client) 323 { 324 struct pmbus_data *data = i2c_get_clientdata(client); 325 int status, status2; 326 327 status = _pmbus_read_byte_data(client, -1, data->status_register); 328 if (status < 0 || (status & PB_STATUS_CML)) { 329 status2 = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML); 330 if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND)) 331 return -EIO; 332 } 333 return 0; 334 } 335 336 static bool pmbus_check_register(struct i2c_client *client, 337 int (*func)(struct i2c_client *client, 338 int page, int reg), 339 int page, int reg) 340 { 341 int rv; 342 struct pmbus_data *data = i2c_get_clientdata(client); 343 344 rv = func(client, page, reg); 345 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK)) 346 rv = pmbus_check_status_cml(client); 347 pmbus_clear_fault_page(client, -1); 348 return rv >= 0; 349 } 350 351 bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg) 352 { 353 return pmbus_check_register(client, _pmbus_read_byte_data, page, reg); 354 } 355 EXPORT_SYMBOL_GPL(pmbus_check_byte_register); 356 357 bool pmbus_check_word_register(struct i2c_client *client, int page, int reg) 358 { 359 return pmbus_check_register(client, _pmbus_read_word_data, page, reg); 360 } 361 EXPORT_SYMBOL_GPL(pmbus_check_word_register); 362 363 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client) 364 { 365 struct pmbus_data *data = i2c_get_clientdata(client); 366 367 return data->info; 368 } 369 EXPORT_SYMBOL_GPL(pmbus_get_driver_info); 370 371 static struct _pmbus_status { 372 u32 func; 373 u16 base; 374 u16 reg; 375 } pmbus_status[] = { 376 { PMBUS_HAVE_STATUS_VOUT, PB_STATUS_VOUT_BASE, PMBUS_STATUS_VOUT }, 377 { PMBUS_HAVE_STATUS_IOUT, PB_STATUS_IOUT_BASE, PMBUS_STATUS_IOUT }, 378 { PMBUS_HAVE_STATUS_TEMP, PB_STATUS_TEMP_BASE, 379 PMBUS_STATUS_TEMPERATURE }, 380 { PMBUS_HAVE_STATUS_FAN12, PB_STATUS_FAN_BASE, PMBUS_STATUS_FAN_12 }, 381 { PMBUS_HAVE_STATUS_FAN34, PB_STATUS_FAN34_BASE, PMBUS_STATUS_FAN_34 }, 382 }; 383 384 static struct pmbus_data *pmbus_update_device(struct device *dev) 385 { 386 struct i2c_client *client = to_i2c_client(dev->parent); 387 struct pmbus_data *data = i2c_get_clientdata(client); 388 const struct pmbus_driver_info *info = data->info; 389 struct pmbus_sensor *sensor; 390 391 mutex_lock(&data->update_lock); 392 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 393 int i, j; 394 395 for (i = 0; i < info->pages; i++) { 396 data->status[PB_STATUS_BASE + i] 397 = _pmbus_read_byte_data(client, i, 398 data->status_register); 399 for (j = 0; j < ARRAY_SIZE(pmbus_status); j++) { 400 struct _pmbus_status *s = &pmbus_status[j]; 401 402 if (!(info->func[i] & s->func)) 403 continue; 404 data->status[s->base + i] 405 = _pmbus_read_byte_data(client, i, 406 s->reg); 407 } 408 } 409 410 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) 411 data->status[PB_STATUS_INPUT_BASE] 412 = _pmbus_read_byte_data(client, 0, 413 PMBUS_STATUS_INPUT); 414 415 if (info->func[0] & PMBUS_HAVE_STATUS_VMON) 416 data->status[PB_STATUS_VMON_BASE] 417 = _pmbus_read_byte_data(client, 0, 418 PMBUS_VIRT_STATUS_VMON); 419 420 for (sensor = data->sensors; sensor; sensor = sensor->next) { 421 if (!data->valid || sensor->update) 422 sensor->data 423 = _pmbus_read_word_data(client, 424 sensor->page, 425 sensor->reg); 426 } 427 pmbus_clear_faults(client); 428 data->last_updated = jiffies; 429 data->valid = 1; 430 } 431 mutex_unlock(&data->update_lock); 432 return data; 433 } 434 435 /* 436 * Convert linear sensor values to milli- or micro-units 437 * depending on sensor type. 438 */ 439 static long pmbus_reg2data_linear(struct pmbus_data *data, 440 struct pmbus_sensor *sensor) 441 { 442 s16 exponent; 443 s32 mantissa; 444 long val; 445 446 if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */ 447 exponent = data->exponent[sensor->page]; 448 mantissa = (u16) sensor->data; 449 } else { /* LINEAR11 */ 450 exponent = ((s16)sensor->data) >> 11; 451 mantissa = ((s16)((sensor->data & 0x7ff) << 5)) >> 5; 452 } 453 454 val = mantissa; 455 456 /* scale result to milli-units for all sensors except fans */ 457 if (sensor->class != PSC_FAN) 458 val = val * 1000L; 459 460 /* scale result to micro-units for power sensors */ 461 if (sensor->class == PSC_POWER) 462 val = val * 1000L; 463 464 if (exponent >= 0) 465 val <<= exponent; 466 else 467 val >>= -exponent; 468 469 return val; 470 } 471 472 /* 473 * Convert direct sensor values to milli- or micro-units 474 * depending on sensor type. 475 */ 476 static long pmbus_reg2data_direct(struct pmbus_data *data, 477 struct pmbus_sensor *sensor) 478 { 479 long val = (s16) sensor->data; 480 long m, b, R; 481 482 m = data->info->m[sensor->class]; 483 b = data->info->b[sensor->class]; 484 R = data->info->R[sensor->class]; 485 486 if (m == 0) 487 return 0; 488 489 /* X = 1/m * (Y * 10^-R - b) */ 490 R = -R; 491 /* scale result to milli-units for everything but fans */ 492 if (sensor->class != PSC_FAN) { 493 R += 3; 494 b *= 1000; 495 } 496 497 /* scale result to micro-units for power sensors */ 498 if (sensor->class == PSC_POWER) { 499 R += 3; 500 b *= 1000; 501 } 502 503 while (R > 0) { 504 val *= 10; 505 R--; 506 } 507 while (R < 0) { 508 val = DIV_ROUND_CLOSEST(val, 10); 509 R++; 510 } 511 512 return (val - b) / m; 513 } 514 515 /* 516 * Convert VID sensor values to milli- or micro-units 517 * depending on sensor type. 518 * We currently only support VR11. 519 */ 520 static long pmbus_reg2data_vid(struct pmbus_data *data, 521 struct pmbus_sensor *sensor) 522 { 523 long val = sensor->data; 524 525 if (val < 0x02 || val > 0xb2) 526 return 0; 527 return DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100); 528 } 529 530 static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor) 531 { 532 long val; 533 534 switch (data->info->format[sensor->class]) { 535 case direct: 536 val = pmbus_reg2data_direct(data, sensor); 537 break; 538 case vid: 539 val = pmbus_reg2data_vid(data, sensor); 540 break; 541 case linear: 542 default: 543 val = pmbus_reg2data_linear(data, sensor); 544 break; 545 } 546 return val; 547 } 548 549 #define MAX_MANTISSA (1023 * 1000) 550 #define MIN_MANTISSA (511 * 1000) 551 552 static u16 pmbus_data2reg_linear(struct pmbus_data *data, 553 struct pmbus_sensor *sensor, long val) 554 { 555 s16 exponent = 0, mantissa; 556 bool negative = false; 557 558 /* simple case */ 559 if (val == 0) 560 return 0; 561 562 if (sensor->class == PSC_VOLTAGE_OUT) { 563 /* LINEAR16 does not support negative voltages */ 564 if (val < 0) 565 return 0; 566 567 /* 568 * For a static exponents, we don't have a choice 569 * but to adjust the value to it. 570 */ 571 if (data->exponent[sensor->page] < 0) 572 val <<= -data->exponent[sensor->page]; 573 else 574 val >>= data->exponent[sensor->page]; 575 val = DIV_ROUND_CLOSEST(val, 1000); 576 return val & 0xffff; 577 } 578 579 if (val < 0) { 580 negative = true; 581 val = -val; 582 } 583 584 /* Power is in uW. Convert to mW before converting. */ 585 if (sensor->class == PSC_POWER) 586 val = DIV_ROUND_CLOSEST(val, 1000L); 587 588 /* 589 * For simplicity, convert fan data to milli-units 590 * before calculating the exponent. 591 */ 592 if (sensor->class == PSC_FAN) 593 val = val * 1000; 594 595 /* Reduce large mantissa until it fits into 10 bit */ 596 while (val >= MAX_MANTISSA && exponent < 15) { 597 exponent++; 598 val >>= 1; 599 } 600 /* Increase small mantissa to improve precision */ 601 while (val < MIN_MANTISSA && exponent > -15) { 602 exponent--; 603 val <<= 1; 604 } 605 606 /* Convert mantissa from milli-units to units */ 607 mantissa = DIV_ROUND_CLOSEST(val, 1000); 608 609 /* Ensure that resulting number is within range */ 610 if (mantissa > 0x3ff) 611 mantissa = 0x3ff; 612 613 /* restore sign */ 614 if (negative) 615 mantissa = -mantissa; 616 617 /* Convert to 5 bit exponent, 11 bit mantissa */ 618 return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800); 619 } 620 621 static u16 pmbus_data2reg_direct(struct pmbus_data *data, 622 struct pmbus_sensor *sensor, long val) 623 { 624 long m, b, R; 625 626 m = data->info->m[sensor->class]; 627 b = data->info->b[sensor->class]; 628 R = data->info->R[sensor->class]; 629 630 /* Power is in uW. Adjust R and b. */ 631 if (sensor->class == PSC_POWER) { 632 R -= 3; 633 b *= 1000; 634 } 635 636 /* Calculate Y = (m * X + b) * 10^R */ 637 if (sensor->class != PSC_FAN) { 638 R -= 3; /* Adjust R and b for data in milli-units */ 639 b *= 1000; 640 } 641 val = val * m + b; 642 643 while (R > 0) { 644 val *= 10; 645 R--; 646 } 647 while (R < 0) { 648 val = DIV_ROUND_CLOSEST(val, 10); 649 R++; 650 } 651 652 return val; 653 } 654 655 static u16 pmbus_data2reg_vid(struct pmbus_data *data, 656 struct pmbus_sensor *sensor, long val) 657 { 658 val = clamp_val(val, 500, 1600); 659 660 return 2 + DIV_ROUND_CLOSEST((1600 - val) * 100, 625); 661 } 662 663 static u16 pmbus_data2reg(struct pmbus_data *data, 664 struct pmbus_sensor *sensor, long val) 665 { 666 u16 regval; 667 668 switch (data->info->format[sensor->class]) { 669 case direct: 670 regval = pmbus_data2reg_direct(data, sensor, val); 671 break; 672 case vid: 673 regval = pmbus_data2reg_vid(data, sensor, val); 674 break; 675 case linear: 676 default: 677 regval = pmbus_data2reg_linear(data, sensor, val); 678 break; 679 } 680 return regval; 681 } 682 683 /* 684 * Return boolean calculated from converted data. 685 * <index> defines a status register index and mask. 686 * The mask is in the lower 8 bits, the register index is in bits 8..23. 687 * 688 * The associated pmbus_boolean structure contains optional pointers to two 689 * sensor attributes. If specified, those attributes are compared against each 690 * other to determine if a limit has been exceeded. 691 * 692 * If the sensor attribute pointers are NULL, the function returns true if 693 * (status[reg] & mask) is true. 694 * 695 * If sensor attribute pointers are provided, a comparison against a specified 696 * limit has to be performed to determine the boolean result. 697 * In this case, the function returns true if v1 >= v2 (where v1 and v2 are 698 * sensor values referenced by sensor attribute pointers s1 and s2). 699 * 700 * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>. 701 * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>. 702 * 703 * If a negative value is stored in any of the referenced registers, this value 704 * reflects an error code which will be returned. 705 */ 706 static int pmbus_get_boolean(struct pmbus_data *data, struct pmbus_boolean *b, 707 int index) 708 { 709 struct pmbus_sensor *s1 = b->s1; 710 struct pmbus_sensor *s2 = b->s2; 711 u16 reg = (index >> 8) & 0xffff; 712 u8 mask = index & 0xff; 713 int ret, status; 714 u8 regval; 715 716 status = data->status[reg]; 717 if (status < 0) 718 return status; 719 720 regval = status & mask; 721 if (!s1 && !s2) { 722 ret = !!regval; 723 } else if (!s1 || !s2) { 724 WARN(1, "Bad boolean descriptor %p: s1=%p, s2=%p\n", b, s1, s2); 725 return 0; 726 } else { 727 long v1, v2; 728 729 if (s1->data < 0) 730 return s1->data; 731 if (s2->data < 0) 732 return s2->data; 733 734 v1 = pmbus_reg2data(data, s1); 735 v2 = pmbus_reg2data(data, s2); 736 ret = !!(regval && v1 >= v2); 737 } 738 return ret; 739 } 740 741 static ssize_t pmbus_show_boolean(struct device *dev, 742 struct device_attribute *da, char *buf) 743 { 744 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 745 struct pmbus_boolean *boolean = to_pmbus_boolean(attr); 746 struct pmbus_data *data = pmbus_update_device(dev); 747 int val; 748 749 val = pmbus_get_boolean(data, boolean, attr->index); 750 if (val < 0) 751 return val; 752 return snprintf(buf, PAGE_SIZE, "%d\n", val); 753 } 754 755 static ssize_t pmbus_show_sensor(struct device *dev, 756 struct device_attribute *devattr, char *buf) 757 { 758 struct pmbus_data *data = pmbus_update_device(dev); 759 struct pmbus_sensor *sensor = to_pmbus_sensor(devattr); 760 761 if (sensor->data < 0) 762 return sensor->data; 763 764 return snprintf(buf, PAGE_SIZE, "%ld\n", pmbus_reg2data(data, sensor)); 765 } 766 767 static ssize_t pmbus_set_sensor(struct device *dev, 768 struct device_attribute *devattr, 769 const char *buf, size_t count) 770 { 771 struct i2c_client *client = to_i2c_client(dev->parent); 772 struct pmbus_data *data = i2c_get_clientdata(client); 773 struct pmbus_sensor *sensor = to_pmbus_sensor(devattr); 774 ssize_t rv = count; 775 long val = 0; 776 int ret; 777 u16 regval; 778 779 if (kstrtol(buf, 10, &val) < 0) 780 return -EINVAL; 781 782 mutex_lock(&data->update_lock); 783 regval = pmbus_data2reg(data, sensor, val); 784 ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval); 785 if (ret < 0) 786 rv = ret; 787 else 788 sensor->data = regval; 789 mutex_unlock(&data->update_lock); 790 return rv; 791 } 792 793 static ssize_t pmbus_show_label(struct device *dev, 794 struct device_attribute *da, char *buf) 795 { 796 struct pmbus_label *label = to_pmbus_label(da); 797 798 return snprintf(buf, PAGE_SIZE, "%s\n", label->label); 799 } 800 801 static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr) 802 { 803 if (data->num_attributes >= data->max_attributes - 1) { 804 int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE; 805 void *new_attrs = krealloc(data->group.attrs, 806 new_max_attrs * sizeof(void *), 807 GFP_KERNEL); 808 if (!new_attrs) 809 return -ENOMEM; 810 data->group.attrs = new_attrs; 811 data->max_attributes = new_max_attrs; 812 } 813 814 data->group.attrs[data->num_attributes++] = attr; 815 data->group.attrs[data->num_attributes] = NULL; 816 return 0; 817 } 818 819 static void pmbus_dev_attr_init(struct device_attribute *dev_attr, 820 const char *name, 821 umode_t mode, 822 ssize_t (*show)(struct device *dev, 823 struct device_attribute *attr, 824 char *buf), 825 ssize_t (*store)(struct device *dev, 826 struct device_attribute *attr, 827 const char *buf, size_t count)) 828 { 829 sysfs_attr_init(&dev_attr->attr); 830 dev_attr->attr.name = name; 831 dev_attr->attr.mode = mode; 832 dev_attr->show = show; 833 dev_attr->store = store; 834 } 835 836 static void pmbus_attr_init(struct sensor_device_attribute *a, 837 const char *name, 838 umode_t mode, 839 ssize_t (*show)(struct device *dev, 840 struct device_attribute *attr, 841 char *buf), 842 ssize_t (*store)(struct device *dev, 843 struct device_attribute *attr, 844 const char *buf, size_t count), 845 int idx) 846 { 847 pmbus_dev_attr_init(&a->dev_attr, name, mode, show, store); 848 a->index = idx; 849 } 850 851 static int pmbus_add_boolean(struct pmbus_data *data, 852 const char *name, const char *type, int seq, 853 struct pmbus_sensor *s1, 854 struct pmbus_sensor *s2, 855 u16 reg, u8 mask) 856 { 857 struct pmbus_boolean *boolean; 858 struct sensor_device_attribute *a; 859 860 boolean = devm_kzalloc(data->dev, sizeof(*boolean), GFP_KERNEL); 861 if (!boolean) 862 return -ENOMEM; 863 864 a = &boolean->attribute; 865 866 snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s", 867 name, seq, type); 868 boolean->s1 = s1; 869 boolean->s2 = s2; 870 pmbus_attr_init(a, boolean->name, S_IRUGO, pmbus_show_boolean, NULL, 871 (reg << 8) | mask); 872 873 return pmbus_add_attribute(data, &a->dev_attr.attr); 874 } 875 876 static struct pmbus_sensor *pmbus_add_sensor(struct pmbus_data *data, 877 const char *name, const char *type, 878 int seq, int page, int reg, 879 enum pmbus_sensor_classes class, 880 bool update, bool readonly) 881 { 882 struct pmbus_sensor *sensor; 883 struct device_attribute *a; 884 885 sensor = devm_kzalloc(data->dev, sizeof(*sensor), GFP_KERNEL); 886 if (!sensor) 887 return NULL; 888 a = &sensor->attribute; 889 890 snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s", 891 name, seq, type); 892 sensor->page = page; 893 sensor->reg = reg; 894 sensor->class = class; 895 sensor->update = update; 896 pmbus_dev_attr_init(a, sensor->name, 897 readonly ? S_IRUGO : S_IRUGO | S_IWUSR, 898 pmbus_show_sensor, pmbus_set_sensor); 899 900 if (pmbus_add_attribute(data, &a->attr)) 901 return NULL; 902 903 sensor->next = data->sensors; 904 data->sensors = sensor; 905 906 return sensor; 907 } 908 909 static int pmbus_add_label(struct pmbus_data *data, 910 const char *name, int seq, 911 const char *lstring, int index) 912 { 913 struct pmbus_label *label; 914 struct device_attribute *a; 915 916 label = devm_kzalloc(data->dev, sizeof(*label), GFP_KERNEL); 917 if (!label) 918 return -ENOMEM; 919 920 a = &label->attribute; 921 922 snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq); 923 if (!index) 924 strncpy(label->label, lstring, sizeof(label->label) - 1); 925 else 926 snprintf(label->label, sizeof(label->label), "%s%d", lstring, 927 index); 928 929 pmbus_dev_attr_init(a, label->name, S_IRUGO, pmbus_show_label, NULL); 930 return pmbus_add_attribute(data, &a->attr); 931 } 932 933 /* 934 * Search for attributes. Allocate sensors, booleans, and labels as needed. 935 */ 936 937 /* 938 * The pmbus_limit_attr structure describes a single limit attribute 939 * and its associated alarm attribute. 940 */ 941 struct pmbus_limit_attr { 942 u16 reg; /* Limit register */ 943 u16 sbit; /* Alarm attribute status bit */ 944 bool update; /* True if register needs updates */ 945 bool low; /* True if low limit; for limits with compare 946 functions only */ 947 const char *attr; /* Attribute name */ 948 const char *alarm; /* Alarm attribute name */ 949 }; 950 951 /* 952 * The pmbus_sensor_attr structure describes one sensor attribute. This 953 * description includes a reference to the associated limit attributes. 954 */ 955 struct pmbus_sensor_attr { 956 u16 reg; /* sensor register */ 957 u8 gbit; /* generic status bit */ 958 u8 nlimit; /* # of limit registers */ 959 enum pmbus_sensor_classes class;/* sensor class */ 960 const char *label; /* sensor label */ 961 bool paged; /* true if paged sensor */ 962 bool update; /* true if update needed */ 963 bool compare; /* true if compare function needed */ 964 u32 func; /* sensor mask */ 965 u32 sfunc; /* sensor status mask */ 966 int sbase; /* status base register */ 967 const struct pmbus_limit_attr *limit;/* limit registers */ 968 }; 969 970 /* 971 * Add a set of limit attributes and, if supported, the associated 972 * alarm attributes. 973 * returns 0 if no alarm register found, 1 if an alarm register was found, 974 * < 0 on errors. 975 */ 976 static int pmbus_add_limit_attrs(struct i2c_client *client, 977 struct pmbus_data *data, 978 const struct pmbus_driver_info *info, 979 const char *name, int index, int page, 980 struct pmbus_sensor *base, 981 const struct pmbus_sensor_attr *attr) 982 { 983 const struct pmbus_limit_attr *l = attr->limit; 984 int nlimit = attr->nlimit; 985 int have_alarm = 0; 986 int i, ret; 987 struct pmbus_sensor *curr; 988 989 for (i = 0; i < nlimit; i++) { 990 if (pmbus_check_word_register(client, page, l->reg)) { 991 curr = pmbus_add_sensor(data, name, l->attr, index, 992 page, l->reg, attr->class, 993 attr->update || l->update, 994 false); 995 if (!curr) 996 return -ENOMEM; 997 if (l->sbit && (info->func[page] & attr->sfunc)) { 998 ret = pmbus_add_boolean(data, name, 999 l->alarm, index, 1000 attr->compare ? l->low ? curr : base 1001 : NULL, 1002 attr->compare ? l->low ? base : curr 1003 : NULL, 1004 attr->sbase + page, l->sbit); 1005 if (ret) 1006 return ret; 1007 have_alarm = 1; 1008 } 1009 } 1010 l++; 1011 } 1012 return have_alarm; 1013 } 1014 1015 static int pmbus_add_sensor_attrs_one(struct i2c_client *client, 1016 struct pmbus_data *data, 1017 const struct pmbus_driver_info *info, 1018 const char *name, 1019 int index, int page, 1020 const struct pmbus_sensor_attr *attr) 1021 { 1022 struct pmbus_sensor *base; 1023 int ret; 1024 1025 if (attr->label) { 1026 ret = pmbus_add_label(data, name, index, attr->label, 1027 attr->paged ? page + 1 : 0); 1028 if (ret) 1029 return ret; 1030 } 1031 base = pmbus_add_sensor(data, name, "input", index, page, attr->reg, 1032 attr->class, true, true); 1033 if (!base) 1034 return -ENOMEM; 1035 if (attr->sfunc) { 1036 ret = pmbus_add_limit_attrs(client, data, info, name, 1037 index, page, base, attr); 1038 if (ret < 0) 1039 return ret; 1040 /* 1041 * Add generic alarm attribute only if there are no individual 1042 * alarm attributes, if there is a global alarm bit, and if 1043 * the generic status register for this page is accessible. 1044 */ 1045 if (!ret && attr->gbit && 1046 pmbus_check_byte_register(client, page, 1047 data->status_register)) { 1048 ret = pmbus_add_boolean(data, name, "alarm", index, 1049 NULL, NULL, 1050 PB_STATUS_BASE + page, 1051 attr->gbit); 1052 if (ret) 1053 return ret; 1054 } 1055 } 1056 return 0; 1057 } 1058 1059 static int pmbus_add_sensor_attrs(struct i2c_client *client, 1060 struct pmbus_data *data, 1061 const char *name, 1062 const struct pmbus_sensor_attr *attrs, 1063 int nattrs) 1064 { 1065 const struct pmbus_driver_info *info = data->info; 1066 int index, i; 1067 int ret; 1068 1069 index = 1; 1070 for (i = 0; i < nattrs; i++) { 1071 int page, pages; 1072 1073 pages = attrs->paged ? info->pages : 1; 1074 for (page = 0; page < pages; page++) { 1075 if (!(info->func[page] & attrs->func)) 1076 continue; 1077 ret = pmbus_add_sensor_attrs_one(client, data, info, 1078 name, index, page, 1079 attrs); 1080 if (ret) 1081 return ret; 1082 index++; 1083 } 1084 attrs++; 1085 } 1086 return 0; 1087 } 1088 1089 static const struct pmbus_limit_attr vin_limit_attrs[] = { 1090 { 1091 .reg = PMBUS_VIN_UV_WARN_LIMIT, 1092 .attr = "min", 1093 .alarm = "min_alarm", 1094 .sbit = PB_VOLTAGE_UV_WARNING, 1095 }, { 1096 .reg = PMBUS_VIN_UV_FAULT_LIMIT, 1097 .attr = "lcrit", 1098 .alarm = "lcrit_alarm", 1099 .sbit = PB_VOLTAGE_UV_FAULT, 1100 }, { 1101 .reg = PMBUS_VIN_OV_WARN_LIMIT, 1102 .attr = "max", 1103 .alarm = "max_alarm", 1104 .sbit = PB_VOLTAGE_OV_WARNING, 1105 }, { 1106 .reg = PMBUS_VIN_OV_FAULT_LIMIT, 1107 .attr = "crit", 1108 .alarm = "crit_alarm", 1109 .sbit = PB_VOLTAGE_OV_FAULT, 1110 }, { 1111 .reg = PMBUS_VIRT_READ_VIN_AVG, 1112 .update = true, 1113 .attr = "average", 1114 }, { 1115 .reg = PMBUS_VIRT_READ_VIN_MIN, 1116 .update = true, 1117 .attr = "lowest", 1118 }, { 1119 .reg = PMBUS_VIRT_READ_VIN_MAX, 1120 .update = true, 1121 .attr = "highest", 1122 }, { 1123 .reg = PMBUS_VIRT_RESET_VIN_HISTORY, 1124 .attr = "reset_history", 1125 }, 1126 }; 1127 1128 static const struct pmbus_limit_attr vmon_limit_attrs[] = { 1129 { 1130 .reg = PMBUS_VIRT_VMON_UV_WARN_LIMIT, 1131 .attr = "min", 1132 .alarm = "min_alarm", 1133 .sbit = PB_VOLTAGE_UV_WARNING, 1134 }, { 1135 .reg = PMBUS_VIRT_VMON_UV_FAULT_LIMIT, 1136 .attr = "lcrit", 1137 .alarm = "lcrit_alarm", 1138 .sbit = PB_VOLTAGE_UV_FAULT, 1139 }, { 1140 .reg = PMBUS_VIRT_VMON_OV_WARN_LIMIT, 1141 .attr = "max", 1142 .alarm = "max_alarm", 1143 .sbit = PB_VOLTAGE_OV_WARNING, 1144 }, { 1145 .reg = PMBUS_VIRT_VMON_OV_FAULT_LIMIT, 1146 .attr = "crit", 1147 .alarm = "crit_alarm", 1148 .sbit = PB_VOLTAGE_OV_FAULT, 1149 } 1150 }; 1151 1152 static const struct pmbus_limit_attr vout_limit_attrs[] = { 1153 { 1154 .reg = PMBUS_VOUT_UV_WARN_LIMIT, 1155 .attr = "min", 1156 .alarm = "min_alarm", 1157 .sbit = PB_VOLTAGE_UV_WARNING, 1158 }, { 1159 .reg = PMBUS_VOUT_UV_FAULT_LIMIT, 1160 .attr = "lcrit", 1161 .alarm = "lcrit_alarm", 1162 .sbit = PB_VOLTAGE_UV_FAULT, 1163 }, { 1164 .reg = PMBUS_VOUT_OV_WARN_LIMIT, 1165 .attr = "max", 1166 .alarm = "max_alarm", 1167 .sbit = PB_VOLTAGE_OV_WARNING, 1168 }, { 1169 .reg = PMBUS_VOUT_OV_FAULT_LIMIT, 1170 .attr = "crit", 1171 .alarm = "crit_alarm", 1172 .sbit = PB_VOLTAGE_OV_FAULT, 1173 }, { 1174 .reg = PMBUS_VIRT_READ_VOUT_AVG, 1175 .update = true, 1176 .attr = "average", 1177 }, { 1178 .reg = PMBUS_VIRT_READ_VOUT_MIN, 1179 .update = true, 1180 .attr = "lowest", 1181 }, { 1182 .reg = PMBUS_VIRT_READ_VOUT_MAX, 1183 .update = true, 1184 .attr = "highest", 1185 }, { 1186 .reg = PMBUS_VIRT_RESET_VOUT_HISTORY, 1187 .attr = "reset_history", 1188 } 1189 }; 1190 1191 static const struct pmbus_sensor_attr voltage_attributes[] = { 1192 { 1193 .reg = PMBUS_READ_VIN, 1194 .class = PSC_VOLTAGE_IN, 1195 .label = "vin", 1196 .func = PMBUS_HAVE_VIN, 1197 .sfunc = PMBUS_HAVE_STATUS_INPUT, 1198 .sbase = PB_STATUS_INPUT_BASE, 1199 .gbit = PB_STATUS_VIN_UV, 1200 .limit = vin_limit_attrs, 1201 .nlimit = ARRAY_SIZE(vin_limit_attrs), 1202 }, { 1203 .reg = PMBUS_VIRT_READ_VMON, 1204 .class = PSC_VOLTAGE_IN, 1205 .label = "vmon", 1206 .func = PMBUS_HAVE_VMON, 1207 .sfunc = PMBUS_HAVE_STATUS_VMON, 1208 .sbase = PB_STATUS_VMON_BASE, 1209 .limit = vmon_limit_attrs, 1210 .nlimit = ARRAY_SIZE(vmon_limit_attrs), 1211 }, { 1212 .reg = PMBUS_READ_VCAP, 1213 .class = PSC_VOLTAGE_IN, 1214 .label = "vcap", 1215 .func = PMBUS_HAVE_VCAP, 1216 }, { 1217 .reg = PMBUS_READ_VOUT, 1218 .class = PSC_VOLTAGE_OUT, 1219 .label = "vout", 1220 .paged = true, 1221 .func = PMBUS_HAVE_VOUT, 1222 .sfunc = PMBUS_HAVE_STATUS_VOUT, 1223 .sbase = PB_STATUS_VOUT_BASE, 1224 .gbit = PB_STATUS_VOUT_OV, 1225 .limit = vout_limit_attrs, 1226 .nlimit = ARRAY_SIZE(vout_limit_attrs), 1227 } 1228 }; 1229 1230 /* Current attributes */ 1231 1232 static const struct pmbus_limit_attr iin_limit_attrs[] = { 1233 { 1234 .reg = PMBUS_IIN_OC_WARN_LIMIT, 1235 .attr = "max", 1236 .alarm = "max_alarm", 1237 .sbit = PB_IIN_OC_WARNING, 1238 }, { 1239 .reg = PMBUS_IIN_OC_FAULT_LIMIT, 1240 .attr = "crit", 1241 .alarm = "crit_alarm", 1242 .sbit = PB_IIN_OC_FAULT, 1243 }, { 1244 .reg = PMBUS_VIRT_READ_IIN_AVG, 1245 .update = true, 1246 .attr = "average", 1247 }, { 1248 .reg = PMBUS_VIRT_READ_IIN_MIN, 1249 .update = true, 1250 .attr = "lowest", 1251 }, { 1252 .reg = PMBUS_VIRT_READ_IIN_MAX, 1253 .update = true, 1254 .attr = "highest", 1255 }, { 1256 .reg = PMBUS_VIRT_RESET_IIN_HISTORY, 1257 .attr = "reset_history", 1258 } 1259 }; 1260 1261 static const struct pmbus_limit_attr iout_limit_attrs[] = { 1262 { 1263 .reg = PMBUS_IOUT_OC_WARN_LIMIT, 1264 .attr = "max", 1265 .alarm = "max_alarm", 1266 .sbit = PB_IOUT_OC_WARNING, 1267 }, { 1268 .reg = PMBUS_IOUT_UC_FAULT_LIMIT, 1269 .attr = "lcrit", 1270 .alarm = "lcrit_alarm", 1271 .sbit = PB_IOUT_UC_FAULT, 1272 }, { 1273 .reg = PMBUS_IOUT_OC_FAULT_LIMIT, 1274 .attr = "crit", 1275 .alarm = "crit_alarm", 1276 .sbit = PB_IOUT_OC_FAULT, 1277 }, { 1278 .reg = PMBUS_VIRT_READ_IOUT_AVG, 1279 .update = true, 1280 .attr = "average", 1281 }, { 1282 .reg = PMBUS_VIRT_READ_IOUT_MIN, 1283 .update = true, 1284 .attr = "lowest", 1285 }, { 1286 .reg = PMBUS_VIRT_READ_IOUT_MAX, 1287 .update = true, 1288 .attr = "highest", 1289 }, { 1290 .reg = PMBUS_VIRT_RESET_IOUT_HISTORY, 1291 .attr = "reset_history", 1292 } 1293 }; 1294 1295 static const struct pmbus_sensor_attr current_attributes[] = { 1296 { 1297 .reg = PMBUS_READ_IIN, 1298 .class = PSC_CURRENT_IN, 1299 .label = "iin", 1300 .func = PMBUS_HAVE_IIN, 1301 .sfunc = PMBUS_HAVE_STATUS_INPUT, 1302 .sbase = PB_STATUS_INPUT_BASE, 1303 .limit = iin_limit_attrs, 1304 .nlimit = ARRAY_SIZE(iin_limit_attrs), 1305 }, { 1306 .reg = PMBUS_READ_IOUT, 1307 .class = PSC_CURRENT_OUT, 1308 .label = "iout", 1309 .paged = true, 1310 .func = PMBUS_HAVE_IOUT, 1311 .sfunc = PMBUS_HAVE_STATUS_IOUT, 1312 .sbase = PB_STATUS_IOUT_BASE, 1313 .gbit = PB_STATUS_IOUT_OC, 1314 .limit = iout_limit_attrs, 1315 .nlimit = ARRAY_SIZE(iout_limit_attrs), 1316 } 1317 }; 1318 1319 /* Power attributes */ 1320 1321 static const struct pmbus_limit_attr pin_limit_attrs[] = { 1322 { 1323 .reg = PMBUS_PIN_OP_WARN_LIMIT, 1324 .attr = "max", 1325 .alarm = "alarm", 1326 .sbit = PB_PIN_OP_WARNING, 1327 }, { 1328 .reg = PMBUS_VIRT_READ_PIN_AVG, 1329 .update = true, 1330 .attr = "average", 1331 }, { 1332 .reg = PMBUS_VIRT_READ_PIN_MAX, 1333 .update = true, 1334 .attr = "input_highest", 1335 }, { 1336 .reg = PMBUS_VIRT_RESET_PIN_HISTORY, 1337 .attr = "reset_history", 1338 } 1339 }; 1340 1341 static const struct pmbus_limit_attr pout_limit_attrs[] = { 1342 { 1343 .reg = PMBUS_POUT_MAX, 1344 .attr = "cap", 1345 .alarm = "cap_alarm", 1346 .sbit = PB_POWER_LIMITING, 1347 }, { 1348 .reg = PMBUS_POUT_OP_WARN_LIMIT, 1349 .attr = "max", 1350 .alarm = "max_alarm", 1351 .sbit = PB_POUT_OP_WARNING, 1352 }, { 1353 .reg = PMBUS_POUT_OP_FAULT_LIMIT, 1354 .attr = "crit", 1355 .alarm = "crit_alarm", 1356 .sbit = PB_POUT_OP_FAULT, 1357 }, { 1358 .reg = PMBUS_VIRT_READ_POUT_AVG, 1359 .update = true, 1360 .attr = "average", 1361 }, { 1362 .reg = PMBUS_VIRT_READ_POUT_MAX, 1363 .update = true, 1364 .attr = "input_highest", 1365 }, { 1366 .reg = PMBUS_VIRT_RESET_POUT_HISTORY, 1367 .attr = "reset_history", 1368 } 1369 }; 1370 1371 static const struct pmbus_sensor_attr power_attributes[] = { 1372 { 1373 .reg = PMBUS_READ_PIN, 1374 .class = PSC_POWER, 1375 .label = "pin", 1376 .func = PMBUS_HAVE_PIN, 1377 .sfunc = PMBUS_HAVE_STATUS_INPUT, 1378 .sbase = PB_STATUS_INPUT_BASE, 1379 .limit = pin_limit_attrs, 1380 .nlimit = ARRAY_SIZE(pin_limit_attrs), 1381 }, { 1382 .reg = PMBUS_READ_POUT, 1383 .class = PSC_POWER, 1384 .label = "pout", 1385 .paged = true, 1386 .func = PMBUS_HAVE_POUT, 1387 .sfunc = PMBUS_HAVE_STATUS_IOUT, 1388 .sbase = PB_STATUS_IOUT_BASE, 1389 .limit = pout_limit_attrs, 1390 .nlimit = ARRAY_SIZE(pout_limit_attrs), 1391 } 1392 }; 1393 1394 /* Temperature atributes */ 1395 1396 static const struct pmbus_limit_attr temp_limit_attrs[] = { 1397 { 1398 .reg = PMBUS_UT_WARN_LIMIT, 1399 .low = true, 1400 .attr = "min", 1401 .alarm = "min_alarm", 1402 .sbit = PB_TEMP_UT_WARNING, 1403 }, { 1404 .reg = PMBUS_UT_FAULT_LIMIT, 1405 .low = true, 1406 .attr = "lcrit", 1407 .alarm = "lcrit_alarm", 1408 .sbit = PB_TEMP_UT_FAULT, 1409 }, { 1410 .reg = PMBUS_OT_WARN_LIMIT, 1411 .attr = "max", 1412 .alarm = "max_alarm", 1413 .sbit = PB_TEMP_OT_WARNING, 1414 }, { 1415 .reg = PMBUS_OT_FAULT_LIMIT, 1416 .attr = "crit", 1417 .alarm = "crit_alarm", 1418 .sbit = PB_TEMP_OT_FAULT, 1419 }, { 1420 .reg = PMBUS_VIRT_READ_TEMP_MIN, 1421 .attr = "lowest", 1422 }, { 1423 .reg = PMBUS_VIRT_READ_TEMP_AVG, 1424 .attr = "average", 1425 }, { 1426 .reg = PMBUS_VIRT_READ_TEMP_MAX, 1427 .attr = "highest", 1428 }, { 1429 .reg = PMBUS_VIRT_RESET_TEMP_HISTORY, 1430 .attr = "reset_history", 1431 } 1432 }; 1433 1434 static const struct pmbus_limit_attr temp_limit_attrs2[] = { 1435 { 1436 .reg = PMBUS_UT_WARN_LIMIT, 1437 .low = true, 1438 .attr = "min", 1439 .alarm = "min_alarm", 1440 .sbit = PB_TEMP_UT_WARNING, 1441 }, { 1442 .reg = PMBUS_UT_FAULT_LIMIT, 1443 .low = true, 1444 .attr = "lcrit", 1445 .alarm = "lcrit_alarm", 1446 .sbit = PB_TEMP_UT_FAULT, 1447 }, { 1448 .reg = PMBUS_OT_WARN_LIMIT, 1449 .attr = "max", 1450 .alarm = "max_alarm", 1451 .sbit = PB_TEMP_OT_WARNING, 1452 }, { 1453 .reg = PMBUS_OT_FAULT_LIMIT, 1454 .attr = "crit", 1455 .alarm = "crit_alarm", 1456 .sbit = PB_TEMP_OT_FAULT, 1457 }, { 1458 .reg = PMBUS_VIRT_READ_TEMP2_MIN, 1459 .attr = "lowest", 1460 }, { 1461 .reg = PMBUS_VIRT_READ_TEMP2_AVG, 1462 .attr = "average", 1463 }, { 1464 .reg = PMBUS_VIRT_READ_TEMP2_MAX, 1465 .attr = "highest", 1466 }, { 1467 .reg = PMBUS_VIRT_RESET_TEMP2_HISTORY, 1468 .attr = "reset_history", 1469 } 1470 }; 1471 1472 static const struct pmbus_limit_attr temp_limit_attrs3[] = { 1473 { 1474 .reg = PMBUS_UT_WARN_LIMIT, 1475 .low = true, 1476 .attr = "min", 1477 .alarm = "min_alarm", 1478 .sbit = PB_TEMP_UT_WARNING, 1479 }, { 1480 .reg = PMBUS_UT_FAULT_LIMIT, 1481 .low = true, 1482 .attr = "lcrit", 1483 .alarm = "lcrit_alarm", 1484 .sbit = PB_TEMP_UT_FAULT, 1485 }, { 1486 .reg = PMBUS_OT_WARN_LIMIT, 1487 .attr = "max", 1488 .alarm = "max_alarm", 1489 .sbit = PB_TEMP_OT_WARNING, 1490 }, { 1491 .reg = PMBUS_OT_FAULT_LIMIT, 1492 .attr = "crit", 1493 .alarm = "crit_alarm", 1494 .sbit = PB_TEMP_OT_FAULT, 1495 } 1496 }; 1497 1498 static const struct pmbus_sensor_attr temp_attributes[] = { 1499 { 1500 .reg = PMBUS_READ_TEMPERATURE_1, 1501 .class = PSC_TEMPERATURE, 1502 .paged = true, 1503 .update = true, 1504 .compare = true, 1505 .func = PMBUS_HAVE_TEMP, 1506 .sfunc = PMBUS_HAVE_STATUS_TEMP, 1507 .sbase = PB_STATUS_TEMP_BASE, 1508 .gbit = PB_STATUS_TEMPERATURE, 1509 .limit = temp_limit_attrs, 1510 .nlimit = ARRAY_SIZE(temp_limit_attrs), 1511 }, { 1512 .reg = PMBUS_READ_TEMPERATURE_2, 1513 .class = PSC_TEMPERATURE, 1514 .paged = true, 1515 .update = true, 1516 .compare = true, 1517 .func = PMBUS_HAVE_TEMP2, 1518 .sfunc = PMBUS_HAVE_STATUS_TEMP, 1519 .sbase = PB_STATUS_TEMP_BASE, 1520 .gbit = PB_STATUS_TEMPERATURE, 1521 .limit = temp_limit_attrs2, 1522 .nlimit = ARRAY_SIZE(temp_limit_attrs2), 1523 }, { 1524 .reg = PMBUS_READ_TEMPERATURE_3, 1525 .class = PSC_TEMPERATURE, 1526 .paged = true, 1527 .update = true, 1528 .compare = true, 1529 .func = PMBUS_HAVE_TEMP3, 1530 .sfunc = PMBUS_HAVE_STATUS_TEMP, 1531 .sbase = PB_STATUS_TEMP_BASE, 1532 .gbit = PB_STATUS_TEMPERATURE, 1533 .limit = temp_limit_attrs3, 1534 .nlimit = ARRAY_SIZE(temp_limit_attrs3), 1535 } 1536 }; 1537 1538 static const int pmbus_fan_registers[] = { 1539 PMBUS_READ_FAN_SPEED_1, 1540 PMBUS_READ_FAN_SPEED_2, 1541 PMBUS_READ_FAN_SPEED_3, 1542 PMBUS_READ_FAN_SPEED_4 1543 }; 1544 1545 static const int pmbus_fan_config_registers[] = { 1546 PMBUS_FAN_CONFIG_12, 1547 PMBUS_FAN_CONFIG_12, 1548 PMBUS_FAN_CONFIG_34, 1549 PMBUS_FAN_CONFIG_34 1550 }; 1551 1552 static const int pmbus_fan_status_registers[] = { 1553 PMBUS_STATUS_FAN_12, 1554 PMBUS_STATUS_FAN_12, 1555 PMBUS_STATUS_FAN_34, 1556 PMBUS_STATUS_FAN_34 1557 }; 1558 1559 static const u32 pmbus_fan_flags[] = { 1560 PMBUS_HAVE_FAN12, 1561 PMBUS_HAVE_FAN12, 1562 PMBUS_HAVE_FAN34, 1563 PMBUS_HAVE_FAN34 1564 }; 1565 1566 static const u32 pmbus_fan_status_flags[] = { 1567 PMBUS_HAVE_STATUS_FAN12, 1568 PMBUS_HAVE_STATUS_FAN12, 1569 PMBUS_HAVE_STATUS_FAN34, 1570 PMBUS_HAVE_STATUS_FAN34 1571 }; 1572 1573 /* Fans */ 1574 static int pmbus_add_fan_attributes(struct i2c_client *client, 1575 struct pmbus_data *data) 1576 { 1577 const struct pmbus_driver_info *info = data->info; 1578 int index = 1; 1579 int page; 1580 int ret; 1581 1582 for (page = 0; page < info->pages; page++) { 1583 int f; 1584 1585 for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) { 1586 int regval; 1587 1588 if (!(info->func[page] & pmbus_fan_flags[f])) 1589 break; 1590 1591 if (!pmbus_check_word_register(client, page, 1592 pmbus_fan_registers[f])) 1593 break; 1594 1595 /* 1596 * Skip fan if not installed. 1597 * Each fan configuration register covers multiple fans, 1598 * so we have to do some magic. 1599 */ 1600 regval = _pmbus_read_byte_data(client, page, 1601 pmbus_fan_config_registers[f]); 1602 if (regval < 0 || 1603 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4))))) 1604 continue; 1605 1606 if (pmbus_add_sensor(data, "fan", "input", index, 1607 page, pmbus_fan_registers[f], 1608 PSC_FAN, true, true) == NULL) 1609 return -ENOMEM; 1610 1611 /* 1612 * Each fan status register covers multiple fans, 1613 * so we have to do some magic. 1614 */ 1615 if ((info->func[page] & pmbus_fan_status_flags[f]) && 1616 pmbus_check_byte_register(client, 1617 page, pmbus_fan_status_registers[f])) { 1618 int base; 1619 1620 if (f > 1) /* fan 3, 4 */ 1621 base = PB_STATUS_FAN34_BASE + page; 1622 else 1623 base = PB_STATUS_FAN_BASE + page; 1624 ret = pmbus_add_boolean(data, "fan", 1625 "alarm", index, NULL, NULL, base, 1626 PB_FAN_FAN1_WARNING >> (f & 1)); 1627 if (ret) 1628 return ret; 1629 ret = pmbus_add_boolean(data, "fan", 1630 "fault", index, NULL, NULL, base, 1631 PB_FAN_FAN1_FAULT >> (f & 1)); 1632 if (ret) 1633 return ret; 1634 } 1635 index++; 1636 } 1637 } 1638 return 0; 1639 } 1640 1641 static int pmbus_find_attributes(struct i2c_client *client, 1642 struct pmbus_data *data) 1643 { 1644 int ret; 1645 1646 /* Voltage sensors */ 1647 ret = pmbus_add_sensor_attrs(client, data, "in", voltage_attributes, 1648 ARRAY_SIZE(voltage_attributes)); 1649 if (ret) 1650 return ret; 1651 1652 /* Current sensors */ 1653 ret = pmbus_add_sensor_attrs(client, data, "curr", current_attributes, 1654 ARRAY_SIZE(current_attributes)); 1655 if (ret) 1656 return ret; 1657 1658 /* Power sensors */ 1659 ret = pmbus_add_sensor_attrs(client, data, "power", power_attributes, 1660 ARRAY_SIZE(power_attributes)); 1661 if (ret) 1662 return ret; 1663 1664 /* Temperature sensors */ 1665 ret = pmbus_add_sensor_attrs(client, data, "temp", temp_attributes, 1666 ARRAY_SIZE(temp_attributes)); 1667 if (ret) 1668 return ret; 1669 1670 /* Fans */ 1671 ret = pmbus_add_fan_attributes(client, data); 1672 return ret; 1673 } 1674 1675 /* 1676 * Identify chip parameters. 1677 * This function is called for all chips. 1678 */ 1679 static int pmbus_identify_common(struct i2c_client *client, 1680 struct pmbus_data *data, int page) 1681 { 1682 int vout_mode = -1; 1683 1684 if (pmbus_check_byte_register(client, page, PMBUS_VOUT_MODE)) 1685 vout_mode = _pmbus_read_byte_data(client, page, 1686 PMBUS_VOUT_MODE); 1687 if (vout_mode >= 0 && vout_mode != 0xff) { 1688 /* 1689 * Not all chips support the VOUT_MODE command, 1690 * so a failure to read it is not an error. 1691 */ 1692 switch (vout_mode >> 5) { 1693 case 0: /* linear mode */ 1694 if (data->info->format[PSC_VOLTAGE_OUT] != linear) 1695 return -ENODEV; 1696 1697 data->exponent[page] = ((s8)(vout_mode << 3)) >> 3; 1698 break; 1699 case 1: /* VID mode */ 1700 if (data->info->format[PSC_VOLTAGE_OUT] != vid) 1701 return -ENODEV; 1702 break; 1703 case 2: /* direct mode */ 1704 if (data->info->format[PSC_VOLTAGE_OUT] != direct) 1705 return -ENODEV; 1706 break; 1707 default: 1708 return -ENODEV; 1709 } 1710 } 1711 1712 pmbus_clear_fault_page(client, page); 1713 return 0; 1714 } 1715 1716 static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data, 1717 struct pmbus_driver_info *info) 1718 { 1719 struct device *dev = &client->dev; 1720 int page, ret; 1721 1722 /* 1723 * Some PMBus chips don't support PMBUS_STATUS_BYTE, so try 1724 * to use PMBUS_STATUS_WORD instead if that is the case. 1725 * Bail out if both registers are not supported. 1726 */ 1727 data->status_register = PMBUS_STATUS_BYTE; 1728 ret = i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE); 1729 if (ret < 0 || ret == 0xff) { 1730 data->status_register = PMBUS_STATUS_WORD; 1731 ret = i2c_smbus_read_word_data(client, PMBUS_STATUS_WORD); 1732 if (ret < 0 || ret == 0xffff) { 1733 dev_err(dev, "PMBus status register not found\n"); 1734 return -ENODEV; 1735 } 1736 } 1737 1738 pmbus_clear_faults(client); 1739 1740 if (info->identify) { 1741 ret = (*info->identify)(client, info); 1742 if (ret < 0) { 1743 dev_err(dev, "Chip identification failed\n"); 1744 return ret; 1745 } 1746 } 1747 1748 if (info->pages <= 0 || info->pages > PMBUS_PAGES) { 1749 dev_err(dev, "Bad number of PMBus pages: %d\n", info->pages); 1750 return -ENODEV; 1751 } 1752 1753 for (page = 0; page < info->pages; page++) { 1754 ret = pmbus_identify_common(client, data, page); 1755 if (ret < 0) { 1756 dev_err(dev, "Failed to identify chip capabilities\n"); 1757 return ret; 1758 } 1759 } 1760 return 0; 1761 } 1762 1763 #if IS_ENABLED(CONFIG_REGULATOR) 1764 static int pmbus_regulator_is_enabled(struct regulator_dev *rdev) 1765 { 1766 struct device *dev = rdev_get_dev(rdev); 1767 struct i2c_client *client = to_i2c_client(dev->parent); 1768 u8 page = rdev_get_id(rdev); 1769 int ret; 1770 1771 ret = pmbus_read_byte_data(client, page, PMBUS_OPERATION); 1772 if (ret < 0) 1773 return ret; 1774 1775 return !!(ret & PB_OPERATION_CONTROL_ON); 1776 } 1777 1778 static int _pmbus_regulator_on_off(struct regulator_dev *rdev, bool enable) 1779 { 1780 struct device *dev = rdev_get_dev(rdev); 1781 struct i2c_client *client = to_i2c_client(dev->parent); 1782 u8 page = rdev_get_id(rdev); 1783 1784 return pmbus_update_byte_data(client, page, PMBUS_OPERATION, 1785 PB_OPERATION_CONTROL_ON, 1786 enable ? PB_OPERATION_CONTROL_ON : 0); 1787 } 1788 1789 static int pmbus_regulator_enable(struct regulator_dev *rdev) 1790 { 1791 return _pmbus_regulator_on_off(rdev, 1); 1792 } 1793 1794 static int pmbus_regulator_disable(struct regulator_dev *rdev) 1795 { 1796 return _pmbus_regulator_on_off(rdev, 0); 1797 } 1798 1799 struct regulator_ops pmbus_regulator_ops = { 1800 .enable = pmbus_regulator_enable, 1801 .disable = pmbus_regulator_disable, 1802 .is_enabled = pmbus_regulator_is_enabled, 1803 }; 1804 EXPORT_SYMBOL_GPL(pmbus_regulator_ops); 1805 1806 static int pmbus_regulator_register(struct pmbus_data *data) 1807 { 1808 struct device *dev = data->dev; 1809 const struct pmbus_driver_info *info = data->info; 1810 const struct pmbus_platform_data *pdata = dev_get_platdata(dev); 1811 struct regulator_dev *rdev; 1812 int i; 1813 1814 for (i = 0; i < info->num_regulators; i++) { 1815 struct regulator_config config = { }; 1816 1817 config.dev = dev; 1818 config.driver_data = data; 1819 1820 if (pdata && pdata->reg_init_data) 1821 config.init_data = &pdata->reg_init_data[i]; 1822 1823 rdev = devm_regulator_register(dev, &info->reg_desc[i], 1824 &config); 1825 if (IS_ERR(rdev)) { 1826 dev_err(dev, "Failed to register %s regulator\n", 1827 info->reg_desc[i].name); 1828 return PTR_ERR(rdev); 1829 } 1830 } 1831 1832 return 0; 1833 } 1834 #else 1835 static int pmbus_regulator_register(struct pmbus_data *data) 1836 { 1837 return 0; 1838 } 1839 #endif 1840 1841 int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id, 1842 struct pmbus_driver_info *info) 1843 { 1844 struct device *dev = &client->dev; 1845 const struct pmbus_platform_data *pdata = dev_get_platdata(dev); 1846 struct pmbus_data *data; 1847 int ret; 1848 1849 if (!info) 1850 return -ENODEV; 1851 1852 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE 1853 | I2C_FUNC_SMBUS_BYTE_DATA 1854 | I2C_FUNC_SMBUS_WORD_DATA)) 1855 return -ENODEV; 1856 1857 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 1858 if (!data) 1859 return -ENOMEM; 1860 1861 i2c_set_clientdata(client, data); 1862 mutex_init(&data->update_lock); 1863 data->dev = dev; 1864 1865 if (pdata) 1866 data->flags = pdata->flags; 1867 data->info = info; 1868 1869 ret = pmbus_init_common(client, data, info); 1870 if (ret < 0) 1871 return ret; 1872 1873 ret = pmbus_find_attributes(client, data); 1874 if (ret) 1875 goto out_kfree; 1876 1877 /* 1878 * If there are no attributes, something is wrong. 1879 * Bail out instead of trying to register nothing. 1880 */ 1881 if (!data->num_attributes) { 1882 dev_err(dev, "No attributes found\n"); 1883 ret = -ENODEV; 1884 goto out_kfree; 1885 } 1886 1887 data->groups[0] = &data->group; 1888 data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name, 1889 data, data->groups); 1890 if (IS_ERR(data->hwmon_dev)) { 1891 ret = PTR_ERR(data->hwmon_dev); 1892 dev_err(dev, "Failed to register hwmon device\n"); 1893 goto out_kfree; 1894 } 1895 1896 ret = pmbus_regulator_register(data); 1897 if (ret) 1898 goto out_unregister; 1899 1900 return 0; 1901 1902 out_unregister: 1903 hwmon_device_unregister(data->hwmon_dev); 1904 out_kfree: 1905 kfree(data->group.attrs); 1906 return ret; 1907 } 1908 EXPORT_SYMBOL_GPL(pmbus_do_probe); 1909 1910 int pmbus_do_remove(struct i2c_client *client) 1911 { 1912 struct pmbus_data *data = i2c_get_clientdata(client); 1913 hwmon_device_unregister(data->hwmon_dev); 1914 kfree(data->group.attrs); 1915 return 0; 1916 } 1917 EXPORT_SYMBOL_GPL(pmbus_do_remove); 1918 1919 MODULE_AUTHOR("Guenter Roeck"); 1920 MODULE_DESCRIPTION("PMBus core driver"); 1921 MODULE_LICENSE("GPL"); 1922