1 /* 2 * Hardware monitoring driver for PMBus devices 3 * 4 * Copyright (c) 2010, 2011 Ericsson AB. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 */ 20 21 #include <linux/kernel.h> 22 #include <linux/module.h> 23 #include <linux/init.h> 24 #include <linux/err.h> 25 #include <linux/slab.h> 26 #include <linux/i2c.h> 27 #include <linux/hwmon.h> 28 #include <linux/hwmon-sysfs.h> 29 #include <linux/delay.h> 30 #include <linux/i2c/pmbus.h> 31 #include "pmbus.h" 32 33 /* 34 * Constants needed to determine number of sensors, booleans, and labels. 35 */ 36 #define PMBUS_MAX_INPUT_SENSORS 22 /* 10*volt, 7*curr, 5*power */ 37 #define PMBUS_VOUT_SENSORS_PER_PAGE 9 /* input, min, max, lcrit, 38 crit, lowest, highest, avg, 39 reset */ 40 #define PMBUS_IOUT_SENSORS_PER_PAGE 8 /* input, min, max, crit, 41 lowest, highest, avg, 42 reset */ 43 #define PMBUS_POUT_SENSORS_PER_PAGE 4 /* input, cap, max, crit */ 44 #define PMBUS_MAX_SENSORS_PER_FAN 1 /* input */ 45 #define PMBUS_MAX_SENSORS_PER_TEMP 8 /* input, min, max, lcrit, 46 crit, lowest, highest, 47 reset */ 48 49 #define PMBUS_MAX_INPUT_BOOLEANS 7 /* v: min_alarm, max_alarm, 50 lcrit_alarm, crit_alarm; 51 c: alarm, crit_alarm; 52 p: crit_alarm */ 53 #define PMBUS_VOUT_BOOLEANS_PER_PAGE 4 /* min_alarm, max_alarm, 54 lcrit_alarm, crit_alarm */ 55 #define PMBUS_IOUT_BOOLEANS_PER_PAGE 3 /* alarm, lcrit_alarm, 56 crit_alarm */ 57 #define PMBUS_POUT_BOOLEANS_PER_PAGE 2 /* alarm, crit_alarm */ 58 #define PMBUS_MAX_BOOLEANS_PER_FAN 2 /* alarm, fault */ 59 #define PMBUS_MAX_BOOLEANS_PER_TEMP 4 /* min_alarm, max_alarm, 60 lcrit_alarm, crit_alarm */ 61 62 #define PMBUS_MAX_INPUT_LABELS 4 /* vin, vcap, iin, pin */ 63 64 /* 65 * status, status_vout, status_iout, status_fans, status_fan34, and status_temp 66 * are paged. status_input is unpaged. 67 */ 68 #define PB_NUM_STATUS_REG (PMBUS_PAGES * 6 + 1) 69 70 /* 71 * Index into status register array, per status register group 72 */ 73 #define PB_STATUS_BASE 0 74 #define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES) 75 #define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES) 76 #define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES) 77 #define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES) 78 #define PB_STATUS_INPUT_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES) 79 #define PB_STATUS_TEMP_BASE (PB_STATUS_INPUT_BASE + 1) 80 81 #define PMBUS_NAME_SIZE 24 82 83 struct pmbus_sensor { 84 char name[PMBUS_NAME_SIZE]; /* sysfs sensor name */ 85 struct sensor_device_attribute attribute; 86 u8 page; /* page number */ 87 u16 reg; /* register */ 88 enum pmbus_sensor_classes class; /* sensor class */ 89 bool update; /* runtime sensor update needed */ 90 int data; /* Sensor data. 91 Negative if there was a read error */ 92 }; 93 94 struct pmbus_boolean { 95 char name[PMBUS_NAME_SIZE]; /* sysfs boolean name */ 96 struct sensor_device_attribute attribute; 97 }; 98 99 struct pmbus_label { 100 char name[PMBUS_NAME_SIZE]; /* sysfs label name */ 101 struct sensor_device_attribute attribute; 102 char label[PMBUS_NAME_SIZE]; /* label */ 103 }; 104 105 struct pmbus_data { 106 struct device *hwmon_dev; 107 108 u32 flags; /* from platform data */ 109 110 int exponent; /* linear mode: exponent for output voltages */ 111 112 const struct pmbus_driver_info *info; 113 114 int max_attributes; 115 int num_attributes; 116 struct attribute **attributes; 117 struct attribute_group group; 118 119 /* 120 * Sensors cover both sensor and limit registers. 121 */ 122 int max_sensors; 123 int num_sensors; 124 struct pmbus_sensor *sensors; 125 /* 126 * Booleans are used for alarms. 127 * Values are determined from status registers. 128 */ 129 int max_booleans; 130 int num_booleans; 131 struct pmbus_boolean *booleans; 132 /* 133 * Labels are used to map generic names (e.g., "in1") 134 * to PMBus specific names (e.g., "vin" or "vout1"). 135 */ 136 int max_labels; 137 int num_labels; 138 struct pmbus_label *labels; 139 140 struct mutex update_lock; 141 bool valid; 142 unsigned long last_updated; /* in jiffies */ 143 144 /* 145 * A single status register covers multiple attributes, 146 * so we keep them all together. 147 */ 148 u8 status[PB_NUM_STATUS_REG]; 149 150 u8 currpage; 151 }; 152 153 int pmbus_set_page(struct i2c_client *client, u8 page) 154 { 155 struct pmbus_data *data = i2c_get_clientdata(client); 156 int rv = 0; 157 int newpage; 158 159 if (page != data->currpage) { 160 rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page); 161 newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE); 162 if (newpage != page) 163 rv = -EINVAL; 164 else 165 data->currpage = page; 166 } 167 return rv; 168 } 169 EXPORT_SYMBOL_GPL(pmbus_set_page); 170 171 int pmbus_write_byte(struct i2c_client *client, int page, u8 value) 172 { 173 int rv; 174 175 if (page >= 0) { 176 rv = pmbus_set_page(client, page); 177 if (rv < 0) 178 return rv; 179 } 180 181 return i2c_smbus_write_byte(client, value); 182 } 183 EXPORT_SYMBOL_GPL(pmbus_write_byte); 184 185 int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word) 186 { 187 int rv; 188 189 rv = pmbus_set_page(client, page); 190 if (rv < 0) 191 return rv; 192 193 return i2c_smbus_write_word_data(client, reg, word); 194 } 195 EXPORT_SYMBOL_GPL(pmbus_write_word_data); 196 197 /* 198 * _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if 199 * a device specific mapping function exists and calls it if necessary. 200 */ 201 static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg, 202 u16 word) 203 { 204 struct pmbus_data *data = i2c_get_clientdata(client); 205 const struct pmbus_driver_info *info = data->info; 206 int status; 207 208 if (info->write_word_data) { 209 status = info->write_word_data(client, page, reg, word); 210 if (status != -ENODATA) 211 return status; 212 } 213 if (reg >= PMBUS_VIRT_BASE) 214 return -EINVAL; 215 return pmbus_write_word_data(client, page, reg, word); 216 } 217 218 int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg) 219 { 220 int rv; 221 222 rv = pmbus_set_page(client, page); 223 if (rv < 0) 224 return rv; 225 226 return i2c_smbus_read_word_data(client, reg); 227 } 228 EXPORT_SYMBOL_GPL(pmbus_read_word_data); 229 230 /* 231 * _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if 232 * a device specific mapping function exists and calls it if necessary. 233 */ 234 static int _pmbus_read_word_data(struct i2c_client *client, int page, int reg) 235 { 236 struct pmbus_data *data = i2c_get_clientdata(client); 237 const struct pmbus_driver_info *info = data->info; 238 int status; 239 240 if (info->read_word_data) { 241 status = info->read_word_data(client, page, reg); 242 if (status != -ENODATA) 243 return status; 244 } 245 if (reg >= PMBUS_VIRT_BASE) 246 return -EINVAL; 247 return pmbus_read_word_data(client, page, reg); 248 } 249 250 int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg) 251 { 252 int rv; 253 254 if (page >= 0) { 255 rv = pmbus_set_page(client, page); 256 if (rv < 0) 257 return rv; 258 } 259 260 return i2c_smbus_read_byte_data(client, reg); 261 } 262 EXPORT_SYMBOL_GPL(pmbus_read_byte_data); 263 264 /* 265 * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if 266 * a device specific mapping function exists and calls it if necessary. 267 */ 268 static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg) 269 { 270 struct pmbus_data *data = i2c_get_clientdata(client); 271 const struct pmbus_driver_info *info = data->info; 272 int status; 273 274 if (info->read_byte_data) { 275 status = info->read_byte_data(client, page, reg); 276 if (status != -ENODATA) 277 return status; 278 } 279 return pmbus_read_byte_data(client, page, reg); 280 } 281 282 static void pmbus_clear_fault_page(struct i2c_client *client, int page) 283 { 284 pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS); 285 } 286 287 void pmbus_clear_faults(struct i2c_client *client) 288 { 289 struct pmbus_data *data = i2c_get_clientdata(client); 290 int i; 291 292 for (i = 0; i < data->info->pages; i++) 293 pmbus_clear_fault_page(client, i); 294 } 295 EXPORT_SYMBOL_GPL(pmbus_clear_faults); 296 297 static int pmbus_check_status_cml(struct i2c_client *client) 298 { 299 int status, status2; 300 301 status = pmbus_read_byte_data(client, -1, PMBUS_STATUS_BYTE); 302 if (status < 0 || (status & PB_STATUS_CML)) { 303 status2 = pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML); 304 if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND)) 305 return -EINVAL; 306 } 307 return 0; 308 } 309 310 bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg) 311 { 312 int rv; 313 struct pmbus_data *data = i2c_get_clientdata(client); 314 315 rv = _pmbus_read_byte_data(client, page, reg); 316 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK)) 317 rv = pmbus_check_status_cml(client); 318 pmbus_clear_fault_page(client, -1); 319 return rv >= 0; 320 } 321 EXPORT_SYMBOL_GPL(pmbus_check_byte_register); 322 323 bool pmbus_check_word_register(struct i2c_client *client, int page, int reg) 324 { 325 int rv; 326 struct pmbus_data *data = i2c_get_clientdata(client); 327 328 rv = _pmbus_read_word_data(client, page, reg); 329 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK)) 330 rv = pmbus_check_status_cml(client); 331 pmbus_clear_fault_page(client, -1); 332 return rv >= 0; 333 } 334 EXPORT_SYMBOL_GPL(pmbus_check_word_register); 335 336 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client) 337 { 338 struct pmbus_data *data = i2c_get_clientdata(client); 339 340 return data->info; 341 } 342 EXPORT_SYMBOL_GPL(pmbus_get_driver_info); 343 344 static struct pmbus_data *pmbus_update_device(struct device *dev) 345 { 346 struct i2c_client *client = to_i2c_client(dev); 347 struct pmbus_data *data = i2c_get_clientdata(client); 348 const struct pmbus_driver_info *info = data->info; 349 350 mutex_lock(&data->update_lock); 351 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 352 int i; 353 354 for (i = 0; i < info->pages; i++) 355 data->status[PB_STATUS_BASE + i] 356 = pmbus_read_byte_data(client, i, 357 PMBUS_STATUS_BYTE); 358 for (i = 0; i < info->pages; i++) { 359 if (!(info->func[i] & PMBUS_HAVE_STATUS_VOUT)) 360 continue; 361 data->status[PB_STATUS_VOUT_BASE + i] 362 = _pmbus_read_byte_data(client, i, PMBUS_STATUS_VOUT); 363 } 364 for (i = 0; i < info->pages; i++) { 365 if (!(info->func[i] & PMBUS_HAVE_STATUS_IOUT)) 366 continue; 367 data->status[PB_STATUS_IOUT_BASE + i] 368 = _pmbus_read_byte_data(client, i, PMBUS_STATUS_IOUT); 369 } 370 for (i = 0; i < info->pages; i++) { 371 if (!(info->func[i] & PMBUS_HAVE_STATUS_TEMP)) 372 continue; 373 data->status[PB_STATUS_TEMP_BASE + i] 374 = _pmbus_read_byte_data(client, i, 375 PMBUS_STATUS_TEMPERATURE); 376 } 377 for (i = 0; i < info->pages; i++) { 378 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN12)) 379 continue; 380 data->status[PB_STATUS_FAN_BASE + i] 381 = _pmbus_read_byte_data(client, i, 382 PMBUS_STATUS_FAN_12); 383 } 384 385 for (i = 0; i < info->pages; i++) { 386 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN34)) 387 continue; 388 data->status[PB_STATUS_FAN34_BASE + i] 389 = _pmbus_read_byte_data(client, i, 390 PMBUS_STATUS_FAN_34); 391 } 392 393 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) 394 data->status[PB_STATUS_INPUT_BASE] 395 = _pmbus_read_byte_data(client, 0, 396 PMBUS_STATUS_INPUT); 397 398 for (i = 0; i < data->num_sensors; i++) { 399 struct pmbus_sensor *sensor = &data->sensors[i]; 400 401 if (!data->valid || sensor->update) 402 sensor->data 403 = _pmbus_read_word_data(client, 404 sensor->page, 405 sensor->reg); 406 } 407 pmbus_clear_faults(client); 408 data->last_updated = jiffies; 409 data->valid = 1; 410 } 411 mutex_unlock(&data->update_lock); 412 return data; 413 } 414 415 /* 416 * Convert linear sensor values to milli- or micro-units 417 * depending on sensor type. 418 */ 419 static long pmbus_reg2data_linear(struct pmbus_data *data, 420 struct pmbus_sensor *sensor) 421 { 422 s16 exponent; 423 s32 mantissa; 424 long val; 425 426 if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */ 427 exponent = data->exponent; 428 mantissa = (u16) sensor->data; 429 } else { /* LINEAR11 */ 430 exponent = (sensor->data >> 11) & 0x001f; 431 mantissa = sensor->data & 0x07ff; 432 433 if (exponent > 0x0f) 434 exponent |= 0xffe0; /* sign extend exponent */ 435 if (mantissa > 0x03ff) 436 mantissa |= 0xfffff800; /* sign extend mantissa */ 437 } 438 439 val = mantissa; 440 441 /* scale result to milli-units for all sensors except fans */ 442 if (sensor->class != PSC_FAN) 443 val = val * 1000L; 444 445 /* scale result to micro-units for power sensors */ 446 if (sensor->class == PSC_POWER) 447 val = val * 1000L; 448 449 if (exponent >= 0) 450 val <<= exponent; 451 else 452 val >>= -exponent; 453 454 return val; 455 } 456 457 /* 458 * Convert direct sensor values to milli- or micro-units 459 * depending on sensor type. 460 */ 461 static long pmbus_reg2data_direct(struct pmbus_data *data, 462 struct pmbus_sensor *sensor) 463 { 464 long val = (s16) sensor->data; 465 long m, b, R; 466 467 m = data->info->m[sensor->class]; 468 b = data->info->b[sensor->class]; 469 R = data->info->R[sensor->class]; 470 471 if (m == 0) 472 return 0; 473 474 /* X = 1/m * (Y * 10^-R - b) */ 475 R = -R; 476 /* scale result to milli-units for everything but fans */ 477 if (sensor->class != PSC_FAN) { 478 R += 3; 479 b *= 1000; 480 } 481 482 /* scale result to micro-units for power sensors */ 483 if (sensor->class == PSC_POWER) { 484 R += 3; 485 b *= 1000; 486 } 487 488 while (R > 0) { 489 val *= 10; 490 R--; 491 } 492 while (R < 0) { 493 val = DIV_ROUND_CLOSEST(val, 10); 494 R++; 495 } 496 497 return (val - b) / m; 498 } 499 500 /* 501 * Convert VID sensor values to milli- or micro-units 502 * depending on sensor type. 503 * We currently only support VR11. 504 */ 505 static long pmbus_reg2data_vid(struct pmbus_data *data, 506 struct pmbus_sensor *sensor) 507 { 508 long val = sensor->data; 509 510 if (val < 0x02 || val > 0xb2) 511 return 0; 512 return DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100); 513 } 514 515 static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor) 516 { 517 long val; 518 519 switch (data->info->format[sensor->class]) { 520 case direct: 521 val = pmbus_reg2data_direct(data, sensor); 522 break; 523 case vid: 524 val = pmbus_reg2data_vid(data, sensor); 525 break; 526 case linear: 527 default: 528 val = pmbus_reg2data_linear(data, sensor); 529 break; 530 } 531 return val; 532 } 533 534 #define MAX_MANTISSA (1023 * 1000) 535 #define MIN_MANTISSA (511 * 1000) 536 537 static u16 pmbus_data2reg_linear(struct pmbus_data *data, 538 enum pmbus_sensor_classes class, long val) 539 { 540 s16 exponent = 0, mantissa; 541 bool negative = false; 542 543 /* simple case */ 544 if (val == 0) 545 return 0; 546 547 if (class == PSC_VOLTAGE_OUT) { 548 /* LINEAR16 does not support negative voltages */ 549 if (val < 0) 550 return 0; 551 552 /* 553 * For a static exponents, we don't have a choice 554 * but to adjust the value to it. 555 */ 556 if (data->exponent < 0) 557 val <<= -data->exponent; 558 else 559 val >>= data->exponent; 560 val = DIV_ROUND_CLOSEST(val, 1000); 561 return val & 0xffff; 562 } 563 564 if (val < 0) { 565 negative = true; 566 val = -val; 567 } 568 569 /* Power is in uW. Convert to mW before converting. */ 570 if (class == PSC_POWER) 571 val = DIV_ROUND_CLOSEST(val, 1000L); 572 573 /* 574 * For simplicity, convert fan data to milli-units 575 * before calculating the exponent. 576 */ 577 if (class == PSC_FAN) 578 val = val * 1000; 579 580 /* Reduce large mantissa until it fits into 10 bit */ 581 while (val >= MAX_MANTISSA && exponent < 15) { 582 exponent++; 583 val >>= 1; 584 } 585 /* Increase small mantissa to improve precision */ 586 while (val < MIN_MANTISSA && exponent > -15) { 587 exponent--; 588 val <<= 1; 589 } 590 591 /* Convert mantissa from milli-units to units */ 592 mantissa = DIV_ROUND_CLOSEST(val, 1000); 593 594 /* Ensure that resulting number is within range */ 595 if (mantissa > 0x3ff) 596 mantissa = 0x3ff; 597 598 /* restore sign */ 599 if (negative) 600 mantissa = -mantissa; 601 602 /* Convert to 5 bit exponent, 11 bit mantissa */ 603 return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800); 604 } 605 606 static u16 pmbus_data2reg_direct(struct pmbus_data *data, 607 enum pmbus_sensor_classes class, long val) 608 { 609 long m, b, R; 610 611 m = data->info->m[class]; 612 b = data->info->b[class]; 613 R = data->info->R[class]; 614 615 /* Power is in uW. Adjust R and b. */ 616 if (class == PSC_POWER) { 617 R -= 3; 618 b *= 1000; 619 } 620 621 /* Calculate Y = (m * X + b) * 10^R */ 622 if (class != PSC_FAN) { 623 R -= 3; /* Adjust R and b for data in milli-units */ 624 b *= 1000; 625 } 626 val = val * m + b; 627 628 while (R > 0) { 629 val *= 10; 630 R--; 631 } 632 while (R < 0) { 633 val = DIV_ROUND_CLOSEST(val, 10); 634 R++; 635 } 636 637 return val; 638 } 639 640 static u16 pmbus_data2reg_vid(struct pmbus_data *data, 641 enum pmbus_sensor_classes class, long val) 642 { 643 val = SENSORS_LIMIT(val, 500, 1600); 644 645 return 2 + DIV_ROUND_CLOSEST((1600 - val) * 100, 625); 646 } 647 648 static u16 pmbus_data2reg(struct pmbus_data *data, 649 enum pmbus_sensor_classes class, long val) 650 { 651 u16 regval; 652 653 switch (data->info->format[class]) { 654 case direct: 655 regval = pmbus_data2reg_direct(data, class, val); 656 break; 657 case vid: 658 regval = pmbus_data2reg_vid(data, class, val); 659 break; 660 case linear: 661 default: 662 regval = pmbus_data2reg_linear(data, class, val); 663 break; 664 } 665 return regval; 666 } 667 668 /* 669 * Return boolean calculated from converted data. 670 * <index> defines a status register index and mask, and optionally 671 * two sensor indexes. 672 * The upper half-word references the two sensors, 673 * two sensor indices. 674 * The upper half-word references the two optional sensors, 675 * the lower half word references status register and mask. 676 * The function returns true if (status[reg] & mask) is true and, 677 * if specified, if v1 >= v2. 678 * To determine if an object exceeds upper limits, specify <v, limit>. 679 * To determine if an object exceeds lower limits, specify <limit, v>. 680 * 681 * For booleans created with pmbus_add_boolean_reg(), only the lower 16 bits of 682 * index are set. s1 and s2 (the sensor index values) are zero in this case. 683 * The function returns true if (status[reg] & mask) is true. 684 * 685 * If the boolean was created with pmbus_add_boolean_cmp(), a comparison against 686 * a specified limit has to be performed to determine the boolean result. 687 * In this case, the function returns true if v1 >= v2 (where v1 and v2 are 688 * sensor values referenced by sensor indices s1 and s2). 689 * 690 * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>. 691 * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>. 692 * 693 * If a negative value is stored in any of the referenced registers, this value 694 * reflects an error code which will be returned. 695 */ 696 static int pmbus_get_boolean(struct pmbus_data *data, int index, int *val) 697 { 698 u8 s1 = (index >> 24) & 0xff; 699 u8 s2 = (index >> 16) & 0xff; 700 u8 reg = (index >> 8) & 0xff; 701 u8 mask = index & 0xff; 702 int status; 703 u8 regval; 704 705 status = data->status[reg]; 706 if (status < 0) 707 return status; 708 709 regval = status & mask; 710 if (!s1 && !s2) 711 *val = !!regval; 712 else { 713 long v1, v2; 714 struct pmbus_sensor *sensor1, *sensor2; 715 716 sensor1 = &data->sensors[s1]; 717 if (sensor1->data < 0) 718 return sensor1->data; 719 sensor2 = &data->sensors[s2]; 720 if (sensor2->data < 0) 721 return sensor2->data; 722 723 v1 = pmbus_reg2data(data, sensor1); 724 v2 = pmbus_reg2data(data, sensor2); 725 *val = !!(regval && v1 >= v2); 726 } 727 return 0; 728 } 729 730 static ssize_t pmbus_show_boolean(struct device *dev, 731 struct device_attribute *da, char *buf) 732 { 733 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 734 struct pmbus_data *data = pmbus_update_device(dev); 735 int val; 736 int err; 737 738 err = pmbus_get_boolean(data, attr->index, &val); 739 if (err) 740 return err; 741 return snprintf(buf, PAGE_SIZE, "%d\n", val); 742 } 743 744 static ssize_t pmbus_show_sensor(struct device *dev, 745 struct device_attribute *da, char *buf) 746 { 747 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 748 struct pmbus_data *data = pmbus_update_device(dev); 749 struct pmbus_sensor *sensor; 750 751 sensor = &data->sensors[attr->index]; 752 if (sensor->data < 0) 753 return sensor->data; 754 755 return snprintf(buf, PAGE_SIZE, "%ld\n", pmbus_reg2data(data, sensor)); 756 } 757 758 static ssize_t pmbus_set_sensor(struct device *dev, 759 struct device_attribute *devattr, 760 const char *buf, size_t count) 761 { 762 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 763 struct i2c_client *client = to_i2c_client(dev); 764 struct pmbus_data *data = i2c_get_clientdata(client); 765 struct pmbus_sensor *sensor = &data->sensors[attr->index]; 766 ssize_t rv = count; 767 long val = 0; 768 int ret; 769 u16 regval; 770 771 if (strict_strtol(buf, 10, &val) < 0) 772 return -EINVAL; 773 774 mutex_lock(&data->update_lock); 775 regval = pmbus_data2reg(data, sensor->class, val); 776 ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval); 777 if (ret < 0) 778 rv = ret; 779 else 780 data->sensors[attr->index].data = regval; 781 mutex_unlock(&data->update_lock); 782 return rv; 783 } 784 785 static ssize_t pmbus_show_label(struct device *dev, 786 struct device_attribute *da, char *buf) 787 { 788 struct i2c_client *client = to_i2c_client(dev); 789 struct pmbus_data *data = i2c_get_clientdata(client); 790 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 791 792 return snprintf(buf, PAGE_SIZE, "%s\n", 793 data->labels[attr->index].label); 794 } 795 796 #define PMBUS_ADD_ATTR(data, _name, _idx, _mode, _type, _show, _set) \ 797 do { \ 798 struct sensor_device_attribute *a \ 799 = &data->_type##s[data->num_##_type##s].attribute; \ 800 BUG_ON(data->num_attributes >= data->max_attributes); \ 801 sysfs_attr_init(&a->dev_attr.attr); \ 802 a->dev_attr.attr.name = _name; \ 803 a->dev_attr.attr.mode = _mode; \ 804 a->dev_attr.show = _show; \ 805 a->dev_attr.store = _set; \ 806 a->index = _idx; \ 807 data->attributes[data->num_attributes] = &a->dev_attr.attr; \ 808 data->num_attributes++; \ 809 } while (0) 810 811 #define PMBUS_ADD_GET_ATTR(data, _name, _type, _idx) \ 812 PMBUS_ADD_ATTR(data, _name, _idx, S_IRUGO, _type, \ 813 pmbus_show_##_type, NULL) 814 815 #define PMBUS_ADD_SET_ATTR(data, _name, _type, _idx) \ 816 PMBUS_ADD_ATTR(data, _name, _idx, S_IWUSR | S_IRUGO, _type, \ 817 pmbus_show_##_type, pmbus_set_##_type) 818 819 static void pmbus_add_boolean(struct pmbus_data *data, 820 const char *name, const char *type, int seq, 821 int idx) 822 { 823 struct pmbus_boolean *boolean; 824 825 BUG_ON(data->num_booleans >= data->max_booleans); 826 827 boolean = &data->booleans[data->num_booleans]; 828 829 snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s", 830 name, seq, type); 831 PMBUS_ADD_GET_ATTR(data, boolean->name, boolean, idx); 832 data->num_booleans++; 833 } 834 835 static void pmbus_add_boolean_reg(struct pmbus_data *data, 836 const char *name, const char *type, 837 int seq, int reg, int bit) 838 { 839 pmbus_add_boolean(data, name, type, seq, (reg << 8) | bit); 840 } 841 842 static void pmbus_add_boolean_cmp(struct pmbus_data *data, 843 const char *name, const char *type, 844 int seq, int i1, int i2, int reg, int mask) 845 { 846 pmbus_add_boolean(data, name, type, seq, 847 (i1 << 24) | (i2 << 16) | (reg << 8) | mask); 848 } 849 850 static void pmbus_add_sensor(struct pmbus_data *data, 851 const char *name, const char *type, int seq, 852 int page, int reg, enum pmbus_sensor_classes class, 853 bool update, bool readonly) 854 { 855 struct pmbus_sensor *sensor; 856 857 BUG_ON(data->num_sensors >= data->max_sensors); 858 859 sensor = &data->sensors[data->num_sensors]; 860 snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s", 861 name, seq, type); 862 sensor->page = page; 863 sensor->reg = reg; 864 sensor->class = class; 865 sensor->update = update; 866 if (readonly) 867 PMBUS_ADD_GET_ATTR(data, sensor->name, sensor, 868 data->num_sensors); 869 else 870 PMBUS_ADD_SET_ATTR(data, sensor->name, sensor, 871 data->num_sensors); 872 data->num_sensors++; 873 } 874 875 static void pmbus_add_label(struct pmbus_data *data, 876 const char *name, int seq, 877 const char *lstring, int index) 878 { 879 struct pmbus_label *label; 880 881 BUG_ON(data->num_labels >= data->max_labels); 882 883 label = &data->labels[data->num_labels]; 884 snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq); 885 if (!index) 886 strncpy(label->label, lstring, sizeof(label->label) - 1); 887 else 888 snprintf(label->label, sizeof(label->label), "%s%d", lstring, 889 index); 890 891 PMBUS_ADD_GET_ATTR(data, label->name, label, data->num_labels); 892 data->num_labels++; 893 } 894 895 /* 896 * Determine maximum number of sensors, booleans, and labels. 897 * To keep things simple, only make a rough high estimate. 898 */ 899 static void pmbus_find_max_attr(struct i2c_client *client, 900 struct pmbus_data *data) 901 { 902 const struct pmbus_driver_info *info = data->info; 903 int page, max_sensors, max_booleans, max_labels; 904 905 max_sensors = PMBUS_MAX_INPUT_SENSORS; 906 max_booleans = PMBUS_MAX_INPUT_BOOLEANS; 907 max_labels = PMBUS_MAX_INPUT_LABELS; 908 909 for (page = 0; page < info->pages; page++) { 910 if (info->func[page] & PMBUS_HAVE_VOUT) { 911 max_sensors += PMBUS_VOUT_SENSORS_PER_PAGE; 912 max_booleans += PMBUS_VOUT_BOOLEANS_PER_PAGE; 913 max_labels++; 914 } 915 if (info->func[page] & PMBUS_HAVE_IOUT) { 916 max_sensors += PMBUS_IOUT_SENSORS_PER_PAGE; 917 max_booleans += PMBUS_IOUT_BOOLEANS_PER_PAGE; 918 max_labels++; 919 } 920 if (info->func[page] & PMBUS_HAVE_POUT) { 921 max_sensors += PMBUS_POUT_SENSORS_PER_PAGE; 922 max_booleans += PMBUS_POUT_BOOLEANS_PER_PAGE; 923 max_labels++; 924 } 925 if (info->func[page] & PMBUS_HAVE_FAN12) { 926 max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN; 927 max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN; 928 } 929 if (info->func[page] & PMBUS_HAVE_FAN34) { 930 max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN; 931 max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN; 932 } 933 if (info->func[page] & PMBUS_HAVE_TEMP) { 934 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP; 935 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP; 936 } 937 if (info->func[page] & PMBUS_HAVE_TEMP2) { 938 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP; 939 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP; 940 } 941 if (info->func[page] & PMBUS_HAVE_TEMP3) { 942 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP; 943 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP; 944 } 945 } 946 data->max_sensors = max_sensors; 947 data->max_booleans = max_booleans; 948 data->max_labels = max_labels; 949 data->max_attributes = max_sensors + max_booleans + max_labels; 950 } 951 952 /* 953 * Search for attributes. Allocate sensors, booleans, and labels as needed. 954 */ 955 956 /* 957 * The pmbus_limit_attr structure describes a single limit attribute 958 * and its associated alarm attribute. 959 */ 960 struct pmbus_limit_attr { 961 u16 reg; /* Limit register */ 962 bool update; /* True if register needs updates */ 963 const char *attr; /* Attribute name */ 964 const char *alarm; /* Alarm attribute name */ 965 u32 sbit; /* Alarm attribute status bit */ 966 }; 967 968 /* 969 * The pmbus_sensor_attr structure describes one sensor attribute. This 970 * description includes a reference to the associated limit attributes. 971 */ 972 struct pmbus_sensor_attr { 973 u8 reg; /* sensor register */ 974 enum pmbus_sensor_classes class;/* sensor class */ 975 const char *label; /* sensor label */ 976 bool paged; /* true if paged sensor */ 977 bool update; /* true if update needed */ 978 bool compare; /* true if compare function needed */ 979 u32 func; /* sensor mask */ 980 u32 sfunc; /* sensor status mask */ 981 int sbase; /* status base register */ 982 u32 gbit; /* generic status bit */ 983 const struct pmbus_limit_attr *limit;/* limit registers */ 984 int nlimit; /* # of limit registers */ 985 }; 986 987 /* 988 * Add a set of limit attributes and, if supported, the associated 989 * alarm attributes. 990 */ 991 static bool pmbus_add_limit_attrs(struct i2c_client *client, 992 struct pmbus_data *data, 993 const struct pmbus_driver_info *info, 994 const char *name, int index, int page, 995 int cbase, 996 const struct pmbus_sensor_attr *attr) 997 { 998 const struct pmbus_limit_attr *l = attr->limit; 999 int nlimit = attr->nlimit; 1000 bool have_alarm = false; 1001 int i, cindex; 1002 1003 for (i = 0; i < nlimit; i++) { 1004 if (pmbus_check_word_register(client, page, l->reg)) { 1005 cindex = data->num_sensors; 1006 pmbus_add_sensor(data, name, l->attr, index, page, 1007 l->reg, attr->class, 1008 attr->update || l->update, 1009 false); 1010 if (l->sbit && (info->func[page] & attr->sfunc)) { 1011 if (attr->compare) { 1012 pmbus_add_boolean_cmp(data, name, 1013 l->alarm, index, 1014 cbase, cindex, 1015 attr->sbase + page, l->sbit); 1016 } else { 1017 pmbus_add_boolean_reg(data, name, 1018 l->alarm, index, 1019 attr->sbase + page, l->sbit); 1020 } 1021 have_alarm = true; 1022 } 1023 } 1024 l++; 1025 } 1026 return have_alarm; 1027 } 1028 1029 static void pmbus_add_sensor_attrs_one(struct i2c_client *client, 1030 struct pmbus_data *data, 1031 const struct pmbus_driver_info *info, 1032 const char *name, 1033 int index, int page, 1034 const struct pmbus_sensor_attr *attr) 1035 { 1036 bool have_alarm; 1037 int cbase = data->num_sensors; 1038 1039 if (attr->label) 1040 pmbus_add_label(data, name, index, attr->label, 1041 attr->paged ? page + 1 : 0); 1042 pmbus_add_sensor(data, name, "input", index, page, attr->reg, 1043 attr->class, true, true); 1044 if (attr->sfunc) { 1045 have_alarm = pmbus_add_limit_attrs(client, data, info, name, 1046 index, page, cbase, attr); 1047 /* 1048 * Add generic alarm attribute only if there are no individual 1049 * alarm attributes, if there is a global alarm bit, and if 1050 * the generic status register for this page is accessible. 1051 */ 1052 if (!have_alarm && attr->gbit && 1053 pmbus_check_byte_register(client, page, PMBUS_STATUS_BYTE)) 1054 pmbus_add_boolean_reg(data, name, "alarm", index, 1055 PB_STATUS_BASE + page, 1056 attr->gbit); 1057 } 1058 } 1059 1060 static void pmbus_add_sensor_attrs(struct i2c_client *client, 1061 struct pmbus_data *data, 1062 const char *name, 1063 const struct pmbus_sensor_attr *attrs, 1064 int nattrs) 1065 { 1066 const struct pmbus_driver_info *info = data->info; 1067 int index, i; 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 pmbus_add_sensor_attrs_one(client, data, info, name, 1078 index, page, attrs); 1079 index++; 1080 } 1081 attrs++; 1082 } 1083 } 1084 1085 static const struct pmbus_limit_attr vin_limit_attrs[] = { 1086 { 1087 .reg = PMBUS_VIN_UV_WARN_LIMIT, 1088 .attr = "min", 1089 .alarm = "min_alarm", 1090 .sbit = PB_VOLTAGE_UV_WARNING, 1091 }, { 1092 .reg = PMBUS_VIN_UV_FAULT_LIMIT, 1093 .attr = "lcrit", 1094 .alarm = "lcrit_alarm", 1095 .sbit = PB_VOLTAGE_UV_FAULT, 1096 }, { 1097 .reg = PMBUS_VIN_OV_WARN_LIMIT, 1098 .attr = "max", 1099 .alarm = "max_alarm", 1100 .sbit = PB_VOLTAGE_OV_WARNING, 1101 }, { 1102 .reg = PMBUS_VIN_OV_FAULT_LIMIT, 1103 .attr = "crit", 1104 .alarm = "crit_alarm", 1105 .sbit = PB_VOLTAGE_OV_FAULT, 1106 }, { 1107 .reg = PMBUS_VIRT_READ_VIN_AVG, 1108 .update = true, 1109 .attr = "average", 1110 }, { 1111 .reg = PMBUS_VIRT_READ_VIN_MIN, 1112 .update = true, 1113 .attr = "lowest", 1114 }, { 1115 .reg = PMBUS_VIRT_READ_VIN_MAX, 1116 .update = true, 1117 .attr = "highest", 1118 }, { 1119 .reg = PMBUS_VIRT_RESET_VIN_HISTORY, 1120 .attr = "reset_history", 1121 }, 1122 }; 1123 1124 static const struct pmbus_limit_attr vout_limit_attrs[] = { 1125 { 1126 .reg = PMBUS_VOUT_UV_WARN_LIMIT, 1127 .attr = "min", 1128 .alarm = "min_alarm", 1129 .sbit = PB_VOLTAGE_UV_WARNING, 1130 }, { 1131 .reg = PMBUS_VOUT_UV_FAULT_LIMIT, 1132 .attr = "lcrit", 1133 .alarm = "lcrit_alarm", 1134 .sbit = PB_VOLTAGE_UV_FAULT, 1135 }, { 1136 .reg = PMBUS_VOUT_OV_WARN_LIMIT, 1137 .attr = "max", 1138 .alarm = "max_alarm", 1139 .sbit = PB_VOLTAGE_OV_WARNING, 1140 }, { 1141 .reg = PMBUS_VOUT_OV_FAULT_LIMIT, 1142 .attr = "crit", 1143 .alarm = "crit_alarm", 1144 .sbit = PB_VOLTAGE_OV_FAULT, 1145 }, { 1146 .reg = PMBUS_VIRT_READ_VOUT_AVG, 1147 .update = true, 1148 .attr = "average", 1149 }, { 1150 .reg = PMBUS_VIRT_READ_VOUT_MIN, 1151 .update = true, 1152 .attr = "lowest", 1153 }, { 1154 .reg = PMBUS_VIRT_READ_VOUT_MAX, 1155 .update = true, 1156 .attr = "highest", 1157 }, { 1158 .reg = PMBUS_VIRT_RESET_VOUT_HISTORY, 1159 .attr = "reset_history", 1160 } 1161 }; 1162 1163 static const struct pmbus_sensor_attr voltage_attributes[] = { 1164 { 1165 .reg = PMBUS_READ_VIN, 1166 .class = PSC_VOLTAGE_IN, 1167 .label = "vin", 1168 .func = PMBUS_HAVE_VIN, 1169 .sfunc = PMBUS_HAVE_STATUS_INPUT, 1170 .sbase = PB_STATUS_INPUT_BASE, 1171 .gbit = PB_STATUS_VIN_UV, 1172 .limit = vin_limit_attrs, 1173 .nlimit = ARRAY_SIZE(vin_limit_attrs), 1174 }, { 1175 .reg = PMBUS_READ_VCAP, 1176 .class = PSC_VOLTAGE_IN, 1177 .label = "vcap", 1178 .func = PMBUS_HAVE_VCAP, 1179 }, { 1180 .reg = PMBUS_READ_VOUT, 1181 .class = PSC_VOLTAGE_OUT, 1182 .label = "vout", 1183 .paged = true, 1184 .func = PMBUS_HAVE_VOUT, 1185 .sfunc = PMBUS_HAVE_STATUS_VOUT, 1186 .sbase = PB_STATUS_VOUT_BASE, 1187 .gbit = PB_STATUS_VOUT_OV, 1188 .limit = vout_limit_attrs, 1189 .nlimit = ARRAY_SIZE(vout_limit_attrs), 1190 } 1191 }; 1192 1193 /* Current attributes */ 1194 1195 static const struct pmbus_limit_attr iin_limit_attrs[] = { 1196 { 1197 .reg = PMBUS_IIN_OC_WARN_LIMIT, 1198 .attr = "max", 1199 .alarm = "max_alarm", 1200 .sbit = PB_IIN_OC_WARNING, 1201 }, { 1202 .reg = PMBUS_IIN_OC_FAULT_LIMIT, 1203 .attr = "crit", 1204 .alarm = "crit_alarm", 1205 .sbit = PB_IIN_OC_FAULT, 1206 }, { 1207 .reg = PMBUS_VIRT_READ_IIN_AVG, 1208 .update = true, 1209 .attr = "average", 1210 }, { 1211 .reg = PMBUS_VIRT_READ_IIN_MIN, 1212 .update = true, 1213 .attr = "lowest", 1214 }, { 1215 .reg = PMBUS_VIRT_READ_IIN_MAX, 1216 .update = true, 1217 .attr = "highest", 1218 }, { 1219 .reg = PMBUS_VIRT_RESET_IIN_HISTORY, 1220 .attr = "reset_history", 1221 } 1222 }; 1223 1224 static const struct pmbus_limit_attr iout_limit_attrs[] = { 1225 { 1226 .reg = PMBUS_IOUT_OC_WARN_LIMIT, 1227 .attr = "max", 1228 .alarm = "max_alarm", 1229 .sbit = PB_IOUT_OC_WARNING, 1230 }, { 1231 .reg = PMBUS_IOUT_UC_FAULT_LIMIT, 1232 .attr = "lcrit", 1233 .alarm = "lcrit_alarm", 1234 .sbit = PB_IOUT_UC_FAULT, 1235 }, { 1236 .reg = PMBUS_IOUT_OC_FAULT_LIMIT, 1237 .attr = "crit", 1238 .alarm = "crit_alarm", 1239 .sbit = PB_IOUT_OC_FAULT, 1240 }, { 1241 .reg = PMBUS_VIRT_READ_IOUT_AVG, 1242 .update = true, 1243 .attr = "average", 1244 }, { 1245 .reg = PMBUS_VIRT_READ_IOUT_MIN, 1246 .update = true, 1247 .attr = "lowest", 1248 }, { 1249 .reg = PMBUS_VIRT_READ_IOUT_MAX, 1250 .update = true, 1251 .attr = "highest", 1252 }, { 1253 .reg = PMBUS_VIRT_RESET_IOUT_HISTORY, 1254 .attr = "reset_history", 1255 } 1256 }; 1257 1258 static const struct pmbus_sensor_attr current_attributes[] = { 1259 { 1260 .reg = PMBUS_READ_IIN, 1261 .class = PSC_CURRENT_IN, 1262 .label = "iin", 1263 .func = PMBUS_HAVE_IIN, 1264 .sfunc = PMBUS_HAVE_STATUS_INPUT, 1265 .sbase = PB_STATUS_INPUT_BASE, 1266 .limit = iin_limit_attrs, 1267 .nlimit = ARRAY_SIZE(iin_limit_attrs), 1268 }, { 1269 .reg = PMBUS_READ_IOUT, 1270 .class = PSC_CURRENT_OUT, 1271 .label = "iout", 1272 .paged = true, 1273 .func = PMBUS_HAVE_IOUT, 1274 .sfunc = PMBUS_HAVE_STATUS_IOUT, 1275 .sbase = PB_STATUS_IOUT_BASE, 1276 .gbit = PB_STATUS_IOUT_OC, 1277 .limit = iout_limit_attrs, 1278 .nlimit = ARRAY_SIZE(iout_limit_attrs), 1279 } 1280 }; 1281 1282 /* Power attributes */ 1283 1284 static const struct pmbus_limit_attr pin_limit_attrs[] = { 1285 { 1286 .reg = PMBUS_PIN_OP_WARN_LIMIT, 1287 .attr = "max", 1288 .alarm = "alarm", 1289 .sbit = PB_PIN_OP_WARNING, 1290 }, { 1291 .reg = PMBUS_VIRT_READ_PIN_AVG, 1292 .update = true, 1293 .attr = "average", 1294 }, { 1295 .reg = PMBUS_VIRT_READ_PIN_MAX, 1296 .update = true, 1297 .attr = "input_highest", 1298 }, { 1299 .reg = PMBUS_VIRT_RESET_PIN_HISTORY, 1300 .attr = "reset_history", 1301 } 1302 }; 1303 1304 static const struct pmbus_limit_attr pout_limit_attrs[] = { 1305 { 1306 .reg = PMBUS_POUT_MAX, 1307 .attr = "cap", 1308 .alarm = "cap_alarm", 1309 .sbit = PB_POWER_LIMITING, 1310 }, { 1311 .reg = PMBUS_POUT_OP_WARN_LIMIT, 1312 .attr = "max", 1313 .alarm = "max_alarm", 1314 .sbit = PB_POUT_OP_WARNING, 1315 }, { 1316 .reg = PMBUS_POUT_OP_FAULT_LIMIT, 1317 .attr = "crit", 1318 .alarm = "crit_alarm", 1319 .sbit = PB_POUT_OP_FAULT, 1320 } 1321 }; 1322 1323 static const struct pmbus_sensor_attr power_attributes[] = { 1324 { 1325 .reg = PMBUS_READ_PIN, 1326 .class = PSC_POWER, 1327 .label = "pin", 1328 .func = PMBUS_HAVE_PIN, 1329 .sfunc = PMBUS_HAVE_STATUS_INPUT, 1330 .sbase = PB_STATUS_INPUT_BASE, 1331 .limit = pin_limit_attrs, 1332 .nlimit = ARRAY_SIZE(pin_limit_attrs), 1333 }, { 1334 .reg = PMBUS_READ_POUT, 1335 .class = PSC_POWER, 1336 .label = "pout", 1337 .paged = true, 1338 .func = PMBUS_HAVE_POUT, 1339 .sfunc = PMBUS_HAVE_STATUS_IOUT, 1340 .sbase = PB_STATUS_IOUT_BASE, 1341 .limit = pout_limit_attrs, 1342 .nlimit = ARRAY_SIZE(pout_limit_attrs), 1343 } 1344 }; 1345 1346 /* Temperature atributes */ 1347 1348 static const struct pmbus_limit_attr temp_limit_attrs[] = { 1349 { 1350 .reg = PMBUS_UT_WARN_LIMIT, 1351 .attr = "min", 1352 .alarm = "min_alarm", 1353 .sbit = PB_TEMP_UT_WARNING, 1354 }, { 1355 .reg = PMBUS_UT_FAULT_LIMIT, 1356 .attr = "lcrit", 1357 .alarm = "lcrit_alarm", 1358 .sbit = PB_TEMP_UT_FAULT, 1359 }, { 1360 .reg = PMBUS_OT_WARN_LIMIT, 1361 .attr = "max", 1362 .alarm = "max_alarm", 1363 .sbit = PB_TEMP_OT_WARNING, 1364 }, { 1365 .reg = PMBUS_OT_FAULT_LIMIT, 1366 .attr = "crit", 1367 .alarm = "crit_alarm", 1368 .sbit = PB_TEMP_OT_FAULT, 1369 }, { 1370 .reg = PMBUS_VIRT_READ_TEMP_MIN, 1371 .attr = "lowest", 1372 }, { 1373 .reg = PMBUS_VIRT_READ_TEMP_MAX, 1374 .attr = "highest", 1375 }, { 1376 .reg = PMBUS_VIRT_RESET_TEMP_HISTORY, 1377 .attr = "reset_history", 1378 } 1379 }; 1380 1381 static const struct pmbus_limit_attr temp_limit_attrs23[] = { 1382 { 1383 .reg = PMBUS_UT_WARN_LIMIT, 1384 .attr = "min", 1385 .alarm = "min_alarm", 1386 .sbit = PB_TEMP_UT_WARNING, 1387 }, { 1388 .reg = PMBUS_UT_FAULT_LIMIT, 1389 .attr = "lcrit", 1390 .alarm = "lcrit_alarm", 1391 .sbit = PB_TEMP_UT_FAULT, 1392 }, { 1393 .reg = PMBUS_OT_WARN_LIMIT, 1394 .attr = "max", 1395 .alarm = "max_alarm", 1396 .sbit = PB_TEMP_OT_WARNING, 1397 }, { 1398 .reg = PMBUS_OT_FAULT_LIMIT, 1399 .attr = "crit", 1400 .alarm = "crit_alarm", 1401 .sbit = PB_TEMP_OT_FAULT, 1402 } 1403 }; 1404 1405 static const struct pmbus_sensor_attr temp_attributes[] = { 1406 { 1407 .reg = PMBUS_READ_TEMPERATURE_1, 1408 .class = PSC_TEMPERATURE, 1409 .paged = true, 1410 .update = true, 1411 .compare = true, 1412 .func = PMBUS_HAVE_TEMP, 1413 .sfunc = PMBUS_HAVE_STATUS_TEMP, 1414 .sbase = PB_STATUS_TEMP_BASE, 1415 .gbit = PB_STATUS_TEMPERATURE, 1416 .limit = temp_limit_attrs, 1417 .nlimit = ARRAY_SIZE(temp_limit_attrs), 1418 }, { 1419 .reg = PMBUS_READ_TEMPERATURE_2, 1420 .class = PSC_TEMPERATURE, 1421 .paged = true, 1422 .update = true, 1423 .compare = true, 1424 .func = PMBUS_HAVE_TEMP2, 1425 .sfunc = PMBUS_HAVE_STATUS_TEMP, 1426 .sbase = PB_STATUS_TEMP_BASE, 1427 .gbit = PB_STATUS_TEMPERATURE, 1428 .limit = temp_limit_attrs23, 1429 .nlimit = ARRAY_SIZE(temp_limit_attrs23), 1430 }, { 1431 .reg = PMBUS_READ_TEMPERATURE_3, 1432 .class = PSC_TEMPERATURE, 1433 .paged = true, 1434 .update = true, 1435 .compare = true, 1436 .func = PMBUS_HAVE_TEMP3, 1437 .sfunc = PMBUS_HAVE_STATUS_TEMP, 1438 .sbase = PB_STATUS_TEMP_BASE, 1439 .gbit = PB_STATUS_TEMPERATURE, 1440 .limit = temp_limit_attrs23, 1441 .nlimit = ARRAY_SIZE(temp_limit_attrs23), 1442 } 1443 }; 1444 1445 static const int pmbus_fan_registers[] = { 1446 PMBUS_READ_FAN_SPEED_1, 1447 PMBUS_READ_FAN_SPEED_2, 1448 PMBUS_READ_FAN_SPEED_3, 1449 PMBUS_READ_FAN_SPEED_4 1450 }; 1451 1452 static const int pmbus_fan_config_registers[] = { 1453 PMBUS_FAN_CONFIG_12, 1454 PMBUS_FAN_CONFIG_12, 1455 PMBUS_FAN_CONFIG_34, 1456 PMBUS_FAN_CONFIG_34 1457 }; 1458 1459 static const int pmbus_fan_status_registers[] = { 1460 PMBUS_STATUS_FAN_12, 1461 PMBUS_STATUS_FAN_12, 1462 PMBUS_STATUS_FAN_34, 1463 PMBUS_STATUS_FAN_34 1464 }; 1465 1466 static const u32 pmbus_fan_flags[] = { 1467 PMBUS_HAVE_FAN12, 1468 PMBUS_HAVE_FAN12, 1469 PMBUS_HAVE_FAN34, 1470 PMBUS_HAVE_FAN34 1471 }; 1472 1473 static const u32 pmbus_fan_status_flags[] = { 1474 PMBUS_HAVE_STATUS_FAN12, 1475 PMBUS_HAVE_STATUS_FAN12, 1476 PMBUS_HAVE_STATUS_FAN34, 1477 PMBUS_HAVE_STATUS_FAN34 1478 }; 1479 1480 /* Fans */ 1481 static void pmbus_add_fan_attributes(struct i2c_client *client, 1482 struct pmbus_data *data) 1483 { 1484 const struct pmbus_driver_info *info = data->info; 1485 int index = 1; 1486 int page; 1487 1488 for (page = 0; page < info->pages; page++) { 1489 int f; 1490 1491 for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) { 1492 int regval; 1493 1494 if (!(info->func[page] & pmbus_fan_flags[f])) 1495 break; 1496 1497 if (!pmbus_check_word_register(client, page, 1498 pmbus_fan_registers[f])) 1499 break; 1500 1501 /* 1502 * Skip fan if not installed. 1503 * Each fan configuration register covers multiple fans, 1504 * so we have to do some magic. 1505 */ 1506 regval = _pmbus_read_byte_data(client, page, 1507 pmbus_fan_config_registers[f]); 1508 if (regval < 0 || 1509 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4))))) 1510 continue; 1511 1512 pmbus_add_sensor(data, "fan", "input", index, page, 1513 pmbus_fan_registers[f], PSC_FAN, true, 1514 true); 1515 1516 /* 1517 * Each fan status register covers multiple fans, 1518 * so we have to do some magic. 1519 */ 1520 if ((info->func[page] & pmbus_fan_status_flags[f]) && 1521 pmbus_check_byte_register(client, 1522 page, pmbus_fan_status_registers[f])) { 1523 int base; 1524 1525 if (f > 1) /* fan 3, 4 */ 1526 base = PB_STATUS_FAN34_BASE + page; 1527 else 1528 base = PB_STATUS_FAN_BASE + page; 1529 pmbus_add_boolean_reg(data, "fan", "alarm", 1530 index, base, 1531 PB_FAN_FAN1_WARNING >> (f & 1)); 1532 pmbus_add_boolean_reg(data, "fan", "fault", 1533 index, base, 1534 PB_FAN_FAN1_FAULT >> (f & 1)); 1535 } 1536 index++; 1537 } 1538 } 1539 } 1540 1541 static void pmbus_find_attributes(struct i2c_client *client, 1542 struct pmbus_data *data) 1543 { 1544 /* Voltage sensors */ 1545 pmbus_add_sensor_attrs(client, data, "in", voltage_attributes, 1546 ARRAY_SIZE(voltage_attributes)); 1547 1548 /* Current sensors */ 1549 pmbus_add_sensor_attrs(client, data, "curr", current_attributes, 1550 ARRAY_SIZE(current_attributes)); 1551 1552 /* Power sensors */ 1553 pmbus_add_sensor_attrs(client, data, "power", power_attributes, 1554 ARRAY_SIZE(power_attributes)); 1555 1556 /* Temperature sensors */ 1557 pmbus_add_sensor_attrs(client, data, "temp", temp_attributes, 1558 ARRAY_SIZE(temp_attributes)); 1559 1560 /* Fans */ 1561 pmbus_add_fan_attributes(client, data); 1562 } 1563 1564 /* 1565 * Identify chip parameters. 1566 * This function is called for all chips. 1567 */ 1568 static int pmbus_identify_common(struct i2c_client *client, 1569 struct pmbus_data *data) 1570 { 1571 int vout_mode = -1, exponent; 1572 1573 if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE)) 1574 vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE); 1575 if (vout_mode >= 0 && vout_mode != 0xff) { 1576 /* 1577 * Not all chips support the VOUT_MODE command, 1578 * so a failure to read it is not an error. 1579 */ 1580 switch (vout_mode >> 5) { 1581 case 0: /* linear mode */ 1582 if (data->info->format[PSC_VOLTAGE_OUT] != linear) 1583 return -ENODEV; 1584 1585 exponent = vout_mode & 0x1f; 1586 /* and sign-extend it */ 1587 if (exponent & 0x10) 1588 exponent |= ~0x1f; 1589 data->exponent = exponent; 1590 break; 1591 case 1: /* VID mode */ 1592 if (data->info->format[PSC_VOLTAGE_OUT] != vid) 1593 return -ENODEV; 1594 break; 1595 case 2: /* direct mode */ 1596 if (data->info->format[PSC_VOLTAGE_OUT] != direct) 1597 return -ENODEV; 1598 break; 1599 default: 1600 return -ENODEV; 1601 } 1602 } 1603 1604 /* Determine maximum number of sensors, booleans, and labels */ 1605 pmbus_find_max_attr(client, data); 1606 pmbus_clear_fault_page(client, 0); 1607 return 0; 1608 } 1609 1610 int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id, 1611 struct pmbus_driver_info *info) 1612 { 1613 const struct pmbus_platform_data *pdata = client->dev.platform_data; 1614 struct pmbus_data *data; 1615 int ret; 1616 1617 if (!info) { 1618 dev_err(&client->dev, "Missing chip information"); 1619 return -ENODEV; 1620 } 1621 1622 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE 1623 | I2C_FUNC_SMBUS_BYTE_DATA 1624 | I2C_FUNC_SMBUS_WORD_DATA)) 1625 return -ENODEV; 1626 1627 data = kzalloc(sizeof(*data), GFP_KERNEL); 1628 if (!data) { 1629 dev_err(&client->dev, "No memory to allocate driver data\n"); 1630 return -ENOMEM; 1631 } 1632 1633 i2c_set_clientdata(client, data); 1634 mutex_init(&data->update_lock); 1635 1636 /* Bail out if PMBus status register does not exist. */ 1637 if (i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE) < 0) { 1638 dev_err(&client->dev, "PMBus status register not found\n"); 1639 ret = -ENODEV; 1640 goto out_data; 1641 } 1642 1643 if (pdata) 1644 data->flags = pdata->flags; 1645 data->info = info; 1646 1647 pmbus_clear_faults(client); 1648 1649 if (info->identify) { 1650 ret = (*info->identify)(client, info); 1651 if (ret < 0) { 1652 dev_err(&client->dev, "Chip identification failed\n"); 1653 goto out_data; 1654 } 1655 } 1656 1657 if (info->pages <= 0 || info->pages > PMBUS_PAGES) { 1658 dev_err(&client->dev, "Bad number of PMBus pages: %d\n", 1659 info->pages); 1660 ret = -EINVAL; 1661 goto out_data; 1662 } 1663 1664 ret = pmbus_identify_common(client, data); 1665 if (ret < 0) { 1666 dev_err(&client->dev, "Failed to identify chip capabilities\n"); 1667 goto out_data; 1668 } 1669 1670 ret = -ENOMEM; 1671 data->sensors = kzalloc(sizeof(struct pmbus_sensor) * data->max_sensors, 1672 GFP_KERNEL); 1673 if (!data->sensors) { 1674 dev_err(&client->dev, "No memory to allocate sensor data\n"); 1675 goto out_data; 1676 } 1677 1678 data->booleans = kzalloc(sizeof(struct pmbus_boolean) 1679 * data->max_booleans, GFP_KERNEL); 1680 if (!data->booleans) { 1681 dev_err(&client->dev, "No memory to allocate boolean data\n"); 1682 goto out_sensors; 1683 } 1684 1685 data->labels = kzalloc(sizeof(struct pmbus_label) * data->max_labels, 1686 GFP_KERNEL); 1687 if (!data->labels) { 1688 dev_err(&client->dev, "No memory to allocate label data\n"); 1689 goto out_booleans; 1690 } 1691 1692 data->attributes = kzalloc(sizeof(struct attribute *) 1693 * data->max_attributes, GFP_KERNEL); 1694 if (!data->attributes) { 1695 dev_err(&client->dev, "No memory to allocate attribute data\n"); 1696 goto out_labels; 1697 } 1698 1699 pmbus_find_attributes(client, data); 1700 1701 /* 1702 * If there are no attributes, something is wrong. 1703 * Bail out instead of trying to register nothing. 1704 */ 1705 if (!data->num_attributes) { 1706 dev_err(&client->dev, "No attributes found\n"); 1707 ret = -ENODEV; 1708 goto out_attributes; 1709 } 1710 1711 /* Register sysfs hooks */ 1712 data->group.attrs = data->attributes; 1713 ret = sysfs_create_group(&client->dev.kobj, &data->group); 1714 if (ret) { 1715 dev_err(&client->dev, "Failed to create sysfs entries\n"); 1716 goto out_attributes; 1717 } 1718 data->hwmon_dev = hwmon_device_register(&client->dev); 1719 if (IS_ERR(data->hwmon_dev)) { 1720 ret = PTR_ERR(data->hwmon_dev); 1721 dev_err(&client->dev, "Failed to register hwmon device\n"); 1722 goto out_hwmon_device_register; 1723 } 1724 return 0; 1725 1726 out_hwmon_device_register: 1727 sysfs_remove_group(&client->dev.kobj, &data->group); 1728 out_attributes: 1729 kfree(data->attributes); 1730 out_labels: 1731 kfree(data->labels); 1732 out_booleans: 1733 kfree(data->booleans); 1734 out_sensors: 1735 kfree(data->sensors); 1736 out_data: 1737 kfree(data); 1738 return ret; 1739 } 1740 EXPORT_SYMBOL_GPL(pmbus_do_probe); 1741 1742 int pmbus_do_remove(struct i2c_client *client) 1743 { 1744 struct pmbus_data *data = i2c_get_clientdata(client); 1745 hwmon_device_unregister(data->hwmon_dev); 1746 sysfs_remove_group(&client->dev.kobj, &data->group); 1747 kfree(data->attributes); 1748 kfree(data->labels); 1749 kfree(data->booleans); 1750 kfree(data->sensors); 1751 kfree(data); 1752 return 0; 1753 } 1754 EXPORT_SYMBOL_GPL(pmbus_do_remove); 1755 1756 MODULE_AUTHOR("Guenter Roeck"); 1757 MODULE_DESCRIPTION("PMBus core driver"); 1758 MODULE_LICENSE("GPL"); 1759