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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 | /* * Driver for SMM665 Power Controller / Monitor * * Copyright (C) 2010 Ericsson AB. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This driver should also work for SMM465, SMM764, and SMM766, but is untested * for those chips. Only monitoring functionality is implemented. * * Datasheets: * http://www.summitmicro.com/prod_select/summary/SMM665/SMM665B_2089_20.pdf * http://www.summitmicro.com/prod_select/summary/SMM766B/SMM766B_2122.pdf */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/err.h> #include <linux/slab.h> #include <linux/i2c.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/delay.h> #include <linux/jiffies.h> /* Internal reference voltage (VREF, x 1000 */ #define SMM665_VREF_ADC_X1000 1250 /* module parameters */ static int vref = SMM665_VREF_ADC_X1000; module_param(vref, int, 0); MODULE_PARM_DESC(vref, "Reference voltage in mV"); enum chips { smm465, smm665, smm665c, smm764, smm766 }; /* * ADC channel addresses */ #define SMM665_MISC16_ADC_DATA_A 0x00 #define SMM665_MISC16_ADC_DATA_B 0x01 #define SMM665_MISC16_ADC_DATA_C 0x02 #define SMM665_MISC16_ADC_DATA_D 0x03 #define SMM665_MISC16_ADC_DATA_E 0x04 #define SMM665_MISC16_ADC_DATA_F 0x05 #define SMM665_MISC16_ADC_DATA_VDD 0x06 #define SMM665_MISC16_ADC_DATA_12V 0x07 #define SMM665_MISC16_ADC_DATA_INT_TEMP 0x08 #define SMM665_MISC16_ADC_DATA_AIN1 0x09 #define SMM665_MISC16_ADC_DATA_AIN2 0x0a /* * Command registers */ #define SMM665_MISC8_CMD_STS 0x80 #define SMM665_MISC8_STATUS1 0x81 #define SMM665_MISC8_STATUSS2 0x82 #define SMM665_MISC8_IO_POLARITY 0x83 #define SMM665_MISC8_PUP_POLARITY 0x84 #define SMM665_MISC8_ADOC_STATUS1 0x85 #define SMM665_MISC8_ADOC_STATUS2 0x86 #define SMM665_MISC8_WRITE_PROT 0x87 #define SMM665_MISC8_STS_TRACK 0x88 /* * Configuration registers and register groups */ #define SMM665_ADOC_ENABLE 0x0d #define SMM665_LIMIT_BASE 0x80 /* First limit register */ /* * Limit register bit masks */ #define SMM665_TRIGGER_RST 0x8000 #define SMM665_TRIGGER_HEALTHY 0x4000 #define SMM665_TRIGGER_POWEROFF 0x2000 #define SMM665_TRIGGER_SHUTDOWN 0x1000 #define SMM665_ADC_MASK 0x03ff #define smm665_is_critical(lim) ((lim) & (SMM665_TRIGGER_RST \ | SMM665_TRIGGER_POWEROFF \ | SMM665_TRIGGER_SHUTDOWN)) /* * Fault register bit definitions * Values are merged from status registers 1/2, * with status register 1 providing the upper 8 bits. */ #define SMM665_FAULT_A 0x0001 #define SMM665_FAULT_B 0x0002 #define SMM665_FAULT_C 0x0004 #define SMM665_FAULT_D 0x0008 #define SMM665_FAULT_E 0x0010 #define SMM665_FAULT_F 0x0020 #define SMM665_FAULT_VDD 0x0040 #define SMM665_FAULT_12V 0x0080 #define SMM665_FAULT_TEMP 0x0100 #define SMM665_FAULT_AIN1 0x0200 #define SMM665_FAULT_AIN2 0x0400 /* * I2C Register addresses * * The configuration register needs to be the configured base register. * The command/status register address is derived from it. */ #define SMM665_REGMASK 0x78 #define SMM665_CMDREG_BASE 0x48 #define SMM665_CONFREG_BASE 0x50 /* * Equations given by chip manufacturer to calculate voltage/temperature values * vref = Reference voltage on VREF_ADC pin (module parameter) * adc = 10bit ADC value read back from registers */ /* Voltage A-F and VDD */ #define SMM665_VMON_ADC_TO_VOLTS(adc) ((adc) * vref / 256) /* Voltage 12VIN */ #define SMM665_12VIN_ADC_TO_VOLTS(adc) ((adc) * vref * 3 / 256) /* Voltage AIN1, AIN2 */ #define SMM665_AIN_ADC_TO_VOLTS(adc) ((adc) * vref / 512) /* Temp Sensor */ #define SMM665_TEMP_ADC_TO_CELSIUS(adc) (((adc) <= 511) ? \ ((int)(adc) * 1000 / 4) : \ (((int)(adc) - 0x400) * 1000 / 4)) #define SMM665_NUM_ADC 11 /* * Chip dependent ADC conversion time, in uS */ #define SMM665_ADC_WAIT_SMM665 70 #define SMM665_ADC_WAIT_SMM766 185 struct smm665_data { enum chips type; int conversion_time; /* ADC conversion time */ struct i2c_client *client; struct mutex update_lock; bool valid; unsigned long last_updated; /* in jiffies */ u16 adc[SMM665_NUM_ADC]; /* adc values (raw) */ u16 faults; /* fault status */ /* The following values are in mV */ int critical_min_limit[SMM665_NUM_ADC]; int alarm_min_limit[SMM665_NUM_ADC]; int critical_max_limit[SMM665_NUM_ADC]; int alarm_max_limit[SMM665_NUM_ADC]; struct i2c_client *cmdreg; }; /* * smm665_read16() * * Read 16 bit value from <reg>, <reg+1>. Upper 8 bits are in <reg>. */ static int smm665_read16(struct i2c_client *client, int reg) { int rv, val; rv = i2c_smbus_read_byte_data(client, reg); if (rv < 0) return rv; val = rv << 8; rv = i2c_smbus_read_byte_data(client, reg + 1); if (rv < 0) return rv; val |= rv; return val; } /* * Read adc value. */ static int smm665_read_adc(struct smm665_data *data, int adc) { struct i2c_client *client = data->cmdreg; int rv; int radc; /* * Algorithm for reading ADC, per SMM665 datasheet * * {[S][addr][W][Ack]} {[offset][Ack]} {[S][addr][R][Nack]} * [wait conversion time] * {[S][addr][R][Ack]} {[datahi][Ack]} {[datalo][Ack][P]} * * To implement the first part of this exchange, * do a full read transaction and expect a failure/Nack. * This sets up the address pointer on the SMM665 * and starts the ADC conversion. * Then do a two-byte read transaction. */ rv = i2c_smbus_read_byte_data(client, adc << 3); if (rv != -ENXIO) { /* * We expect ENXIO to reflect NACK * (per Documentation/i2c/fault-codes). * Everything else is an error. */ dev_dbg(&client->dev, "Unexpected return code %d when setting ADC index", rv); return (rv < 0) ? rv : -EIO; } udelay(data->conversion_time); /* * Now read two bytes. * * Neither i2c_smbus_read_byte() nor * i2c_smbus_read_block_data() worked here, * so use i2c_smbus_read_word_swapped() instead. * We could also try to use i2c_master_recv(), * but that is not always supported. */ rv = i2c_smbus_read_word_swapped(client, 0); if (rv < 0) { dev_dbg(&client->dev, "Failed to read ADC value: error %d", rv); return rv; } /* * Validate/verify readback adc channel (in bit 11..14). */ radc = (rv >> 11) & 0x0f; if (radc != adc) { dev_dbg(&client->dev, "Unexpected RADC: Expected %d got %d", adc, radc); return -EIO; } return rv & SMM665_ADC_MASK; } static struct smm665_data *smm665_update_device(struct device *dev) { struct smm665_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; struct smm665_data *ret = data; mutex_lock(&data->update_lock); if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { int i, val; /* * read status registers */ val = smm665_read16(client, SMM665_MISC8_STATUS1); if (unlikely(val < 0)) { ret = ERR_PTR(val); goto abort; } data->faults = val; /* Read adc registers */ for (i = 0; i < SMM665_NUM_ADC; i++) { val = smm665_read_adc(data, i); if (unlikely(val < 0)) { ret = ERR_PTR(val); goto abort; } data->adc[i] = val; } data->last_updated = jiffies; data->valid = 1; } abort: mutex_unlock(&data->update_lock); return ret; } /* Return converted value from given adc */ static int smm665_convert(u16 adcval, int index) { int val = 0; switch (index) { case SMM665_MISC16_ADC_DATA_12V: val = SMM665_12VIN_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK); break; case SMM665_MISC16_ADC_DATA_VDD: case SMM665_MISC16_ADC_DATA_A: case SMM665_MISC16_ADC_DATA_B: case SMM665_MISC16_ADC_DATA_C: case SMM665_MISC16_ADC_DATA_D: case SMM665_MISC16_ADC_DATA_E: case SMM665_MISC16_ADC_DATA_F: val = SMM665_VMON_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK); break; case SMM665_MISC16_ADC_DATA_AIN1: case SMM665_MISC16_ADC_DATA_AIN2: val = SMM665_AIN_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK); break; case SMM665_MISC16_ADC_DATA_INT_TEMP: val = SMM665_TEMP_ADC_TO_CELSIUS(adcval & SMM665_ADC_MASK); break; default: /* If we get here, the developer messed up */ WARN_ON_ONCE(1); break; } return val; } static int smm665_get_min(struct device *dev, int index) { struct smm665_data *data = dev_get_drvdata(dev); return data->alarm_min_limit[index]; } static int smm665_get_max(struct device *dev, int index) { struct smm665_data *data = dev_get_drvdata(dev); return data->alarm_max_limit[index]; } static int smm665_get_lcrit(struct device *dev, int index) { struct smm665_data *data = dev_get_drvdata(dev); return data->critical_min_limit[index]; } static int smm665_get_crit(struct device *dev, int index) { struct smm665_data *data = dev_get_drvdata(dev); return data->critical_max_limit[index]; } static ssize_t smm665_show_crit_alarm(struct device *dev, struct device_attribute *da, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct smm665_data *data = smm665_update_device(dev); int val = 0; if (IS_ERR(data)) return PTR_ERR(data); if (data->faults & (1 << attr->index)) val = 1; return snprintf(buf, PAGE_SIZE, "%d\n", val); } static ssize_t smm665_show_input(struct device *dev, struct device_attribute *da, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct smm665_data *data = smm665_update_device(dev); int adc = attr->index; int val; if (IS_ERR(data)) return PTR_ERR(data); val = smm665_convert(data->adc[adc], adc); return snprintf(buf, PAGE_SIZE, "%d\n", val); } #define SMM665_SHOW(what) \ static ssize_t smm665_show_##what(struct device *dev, \ struct device_attribute *da, char *buf) \ { \ struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \ const int val = smm665_get_##what(dev, attr->index); \ return snprintf(buf, PAGE_SIZE, "%d\n", val); \ } SMM665_SHOW(min); SMM665_SHOW(max); SMM665_SHOW(lcrit); SMM665_SHOW(crit); /* * These macros are used below in constructing device attribute objects * for use with sysfs_create_group() to make a sysfs device file * for each register. */ #define SMM665_ATTR(name, type, cmd_idx) \ static SENSOR_DEVICE_ATTR(name##_##type, S_IRUGO, \ smm665_show_##type, NULL, cmd_idx) /* Construct a sensor_device_attribute structure for each register */ /* Input voltages */ SMM665_ATTR(in1, input, SMM665_MISC16_ADC_DATA_12V); SMM665_ATTR(in2, input, SMM665_MISC16_ADC_DATA_VDD); SMM665_ATTR(in3, input, SMM665_MISC16_ADC_DATA_A); SMM665_ATTR(in4, input, SMM665_MISC16_ADC_DATA_B); SMM665_ATTR(in5, input, SMM665_MISC16_ADC_DATA_C); SMM665_ATTR(in6, input, SMM665_MISC16_ADC_DATA_D); SMM665_ATTR(in7, input, SMM665_MISC16_ADC_DATA_E); SMM665_ATTR(in8, input, SMM665_MISC16_ADC_DATA_F); SMM665_ATTR(in9, input, SMM665_MISC16_ADC_DATA_AIN1); SMM665_ATTR(in10, input, SMM665_MISC16_ADC_DATA_AIN2); /* Input voltages min */ SMM665_ATTR(in1, min, SMM665_MISC16_ADC_DATA_12V); SMM665_ATTR(in2, min, SMM665_MISC16_ADC_DATA_VDD); SMM665_ATTR(in3, min, SMM665_MISC16_ADC_DATA_A); SMM665_ATTR(in4, min, SMM665_MISC16_ADC_DATA_B); SMM665_ATTR(in5, min, SMM665_MISC16_ADC_DATA_C); SMM665_ATTR(in6, min, SMM665_MISC16_ADC_DATA_D); SMM665_ATTR(in7, min, SMM665_MISC16_ADC_DATA_E); SMM665_ATTR(in8, min, SMM665_MISC16_ADC_DATA_F); SMM665_ATTR(in9, min, SMM665_MISC16_ADC_DATA_AIN1); SMM665_ATTR(in10, min, SMM665_MISC16_ADC_DATA_AIN2); /* Input voltages max */ SMM665_ATTR(in1, max, SMM665_MISC16_ADC_DATA_12V); SMM665_ATTR(in2, max, SMM665_MISC16_ADC_DATA_VDD); SMM665_ATTR(in3, max, SMM665_MISC16_ADC_DATA_A); SMM665_ATTR(in4, max, SMM665_MISC16_ADC_DATA_B); SMM665_ATTR(in5, max, SMM665_MISC16_ADC_DATA_C); SMM665_ATTR(in6, max, SMM665_MISC16_ADC_DATA_D); SMM665_ATTR(in7, max, SMM665_MISC16_ADC_DATA_E); SMM665_ATTR(in8, max, SMM665_MISC16_ADC_DATA_F); SMM665_ATTR(in9, max, SMM665_MISC16_ADC_DATA_AIN1); SMM665_ATTR(in10, max, SMM665_MISC16_ADC_DATA_AIN2); /* Input voltages lcrit */ SMM665_ATTR(in1, lcrit, SMM665_MISC16_ADC_DATA_12V); SMM665_ATTR(in2, lcrit, SMM665_MISC16_ADC_DATA_VDD); SMM665_ATTR(in3, lcrit, SMM665_MISC16_ADC_DATA_A); SMM665_ATTR(in4, lcrit, SMM665_MISC16_ADC_DATA_B); SMM665_ATTR(in5, lcrit, SMM665_MISC16_ADC_DATA_C); SMM665_ATTR(in6, lcrit, SMM665_MISC16_ADC_DATA_D); SMM665_ATTR(in7, lcrit, SMM665_MISC16_ADC_DATA_E); SMM665_ATTR(in8, lcrit, SMM665_MISC16_ADC_DATA_F); SMM665_ATTR(in9, lcrit, SMM665_MISC16_ADC_DATA_AIN1); SMM665_ATTR(in10, lcrit, SMM665_MISC16_ADC_DATA_AIN2); /* Input voltages crit */ SMM665_ATTR(in1, crit, SMM665_MISC16_ADC_DATA_12V); SMM665_ATTR(in2, crit, SMM665_MISC16_ADC_DATA_VDD); SMM665_ATTR(in3, crit, SMM665_MISC16_ADC_DATA_A); SMM665_ATTR(in4, crit, SMM665_MISC16_ADC_DATA_B); SMM665_ATTR(in5, crit, SMM665_MISC16_ADC_DATA_C); SMM665_ATTR(in6, crit, SMM665_MISC16_ADC_DATA_D); SMM665_ATTR(in7, crit, SMM665_MISC16_ADC_DATA_E); SMM665_ATTR(in8, crit, SMM665_MISC16_ADC_DATA_F); SMM665_ATTR(in9, crit, SMM665_MISC16_ADC_DATA_AIN1); SMM665_ATTR(in10, crit, SMM665_MISC16_ADC_DATA_AIN2); /* critical alarms */ SMM665_ATTR(in1, crit_alarm, SMM665_FAULT_12V); SMM665_ATTR(in2, crit_alarm, SMM665_FAULT_VDD); SMM665_ATTR(in3, crit_alarm, SMM665_FAULT_A); SMM665_ATTR(in4, crit_alarm, SMM665_FAULT_B); SMM665_ATTR(in5, crit_alarm, SMM665_FAULT_C); SMM665_ATTR(in6, crit_alarm, SMM665_FAULT_D); SMM665_ATTR(in7, crit_alarm, SMM665_FAULT_E); SMM665_ATTR(in8, crit_alarm, SMM665_FAULT_F); SMM665_ATTR(in9, crit_alarm, SMM665_FAULT_AIN1); SMM665_ATTR(in10, crit_alarm, SMM665_FAULT_AIN2); /* Temperature */ SMM665_ATTR(temp1, input, SMM665_MISC16_ADC_DATA_INT_TEMP); SMM665_ATTR(temp1, min, SMM665_MISC16_ADC_DATA_INT_TEMP); SMM665_ATTR(temp1, max, SMM665_MISC16_ADC_DATA_INT_TEMP); SMM665_ATTR(temp1, lcrit, SMM665_MISC16_ADC_DATA_INT_TEMP); SMM665_ATTR(temp1, crit, SMM665_MISC16_ADC_DATA_INT_TEMP); SMM665_ATTR(temp1, crit_alarm, SMM665_FAULT_TEMP); /* * Finally, construct an array of pointers to members of the above objects, * as required for sysfs_create_group() */ static struct attribute *smm665_attrs[] = { &sensor_dev_attr_in1_input.dev_attr.attr, &sensor_dev_attr_in1_min.dev_attr.attr, &sensor_dev_attr_in1_max.dev_attr.attr, &sensor_dev_attr_in1_lcrit.dev_attr.attr, &sensor_dev_attr_in1_crit.dev_attr.attr, &sensor_dev_attr_in1_crit_alarm.dev_attr.attr, &sensor_dev_attr_in2_input.dev_attr.attr, &sensor_dev_attr_in2_min.dev_attr.attr, &sensor_dev_attr_in2_max.dev_attr.attr, &sensor_dev_attr_in2_lcrit.dev_attr.attr, &sensor_dev_attr_in2_crit.dev_attr.attr, &sensor_dev_attr_in2_crit_alarm.dev_attr.attr, &sensor_dev_attr_in3_input.dev_attr.attr, &sensor_dev_attr_in3_min.dev_attr.attr, &sensor_dev_attr_in3_max.dev_attr.attr, &sensor_dev_attr_in3_lcrit.dev_attr.attr, &sensor_dev_attr_in3_crit.dev_attr.attr, &sensor_dev_attr_in3_crit_alarm.dev_attr.attr, &sensor_dev_attr_in4_input.dev_attr.attr, &sensor_dev_attr_in4_min.dev_attr.attr, &sensor_dev_attr_in4_max.dev_attr.attr, &sensor_dev_attr_in4_lcrit.dev_attr.attr, &sensor_dev_attr_in4_crit.dev_attr.attr, &sensor_dev_attr_in4_crit_alarm.dev_attr.attr, &sensor_dev_attr_in5_input.dev_attr.attr, &sensor_dev_attr_in5_min.dev_attr.attr, &sensor_dev_attr_in5_max.dev_attr.attr, &sensor_dev_attr_in5_lcrit.dev_attr.attr, &sensor_dev_attr_in5_crit.dev_attr.attr, &sensor_dev_attr_in5_crit_alarm.dev_attr.attr, &sensor_dev_attr_in6_input.dev_attr.attr, &sensor_dev_attr_in6_min.dev_attr.attr, &sensor_dev_attr_in6_max.dev_attr.attr, &sensor_dev_attr_in6_lcrit.dev_attr.attr, &sensor_dev_attr_in6_crit.dev_attr.attr, &sensor_dev_attr_in6_crit_alarm.dev_attr.attr, &sensor_dev_attr_in7_input.dev_attr.attr, &sensor_dev_attr_in7_min.dev_attr.attr, &sensor_dev_attr_in7_max.dev_attr.attr, &sensor_dev_attr_in7_lcrit.dev_attr.attr, &sensor_dev_attr_in7_crit.dev_attr.attr, &sensor_dev_attr_in7_crit_alarm.dev_attr.attr, &sensor_dev_attr_in8_input.dev_attr.attr, &sensor_dev_attr_in8_min.dev_attr.attr, &sensor_dev_attr_in8_max.dev_attr.attr, &sensor_dev_attr_in8_lcrit.dev_attr.attr, &sensor_dev_attr_in8_crit.dev_attr.attr, &sensor_dev_attr_in8_crit_alarm.dev_attr.attr, &sensor_dev_attr_in9_input.dev_attr.attr, &sensor_dev_attr_in9_min.dev_attr.attr, &sensor_dev_attr_in9_max.dev_attr.attr, &sensor_dev_attr_in9_lcrit.dev_attr.attr, &sensor_dev_attr_in9_crit.dev_attr.attr, &sensor_dev_attr_in9_crit_alarm.dev_attr.attr, &sensor_dev_attr_in10_input.dev_attr.attr, &sensor_dev_attr_in10_min.dev_attr.attr, &sensor_dev_attr_in10_max.dev_attr.attr, &sensor_dev_attr_in10_lcrit.dev_attr.attr, &sensor_dev_attr_in10_crit.dev_attr.attr, &sensor_dev_attr_in10_crit_alarm.dev_attr.attr, &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp1_min.dev_attr.attr, &sensor_dev_attr_temp1_max.dev_attr.attr, &sensor_dev_attr_temp1_lcrit.dev_attr.attr, &sensor_dev_attr_temp1_crit.dev_attr.attr, &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, NULL, }; ATTRIBUTE_GROUPS(smm665); static int smm665_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct i2c_adapter *adapter = client->adapter; struct smm665_data *data; struct device *hwmon_dev; int i, ret; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) return -ENODEV; if (i2c_smbus_read_byte_data(client, SMM665_ADOC_ENABLE) < 0) return -ENODEV; data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; i2c_set_clientdata(client, data); mutex_init(&data->update_lock); data->client = client; data->type = id->driver_data; data->cmdreg = i2c_new_dummy(adapter, (client->addr & ~SMM665_REGMASK) | SMM665_CMDREG_BASE); if (!data->cmdreg) return -ENOMEM; switch (data->type) { case smm465: case smm665: data->conversion_time = SMM665_ADC_WAIT_SMM665; break; case smm665c: case smm764: case smm766: data->conversion_time = SMM665_ADC_WAIT_SMM766; break; } ret = -ENODEV; if (i2c_smbus_read_byte_data(data->cmdreg, SMM665_MISC8_CMD_STS) < 0) goto out_unregister; /* * Read limits. * * Limit registers start with register SMM665_LIMIT_BASE. * Each channel uses 8 registers, providing four limit values * per channel. Each limit value requires two registers, with the * high byte in the first register and the low byte in the second * register. The first two limits are under limit values, followed * by two over limit values. * * Limit register order matches the ADC register order, so we use * ADC register defines throughout the code to index limit registers. * * We save the first retrieved value both as "critical" and "alarm" * value. The second value overwrites either the critical or the * alarm value, depending on its configuration. This ensures that both * critical and alarm values are initialized, even if both registers are * configured as critical or non-critical. */ for (i = 0; i < SMM665_NUM_ADC; i++) { int val; val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8); if (unlikely(val < 0)) goto out_unregister; data->critical_min_limit[i] = data->alarm_min_limit[i] = smm665_convert(val, i); val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 2); if (unlikely(val < 0)) goto out_unregister; if (smm665_is_critical(val)) data->critical_min_limit[i] = smm665_convert(val, i); else data->alarm_min_limit[i] = smm665_convert(val, i); val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 4); if (unlikely(val < 0)) goto out_unregister; data->critical_max_limit[i] = data->alarm_max_limit[i] = smm665_convert(val, i); val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 6); if (unlikely(val < 0)) goto out_unregister; if (smm665_is_critical(val)) data->critical_max_limit[i] = smm665_convert(val, i); else data->alarm_max_limit[i] = smm665_convert(val, i); } hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev, client->name, data, smm665_groups); if (IS_ERR(hwmon_dev)) { ret = PTR_ERR(hwmon_dev); goto out_unregister; } return 0; out_unregister: i2c_unregister_device(data->cmdreg); return ret; } static int smm665_remove(struct i2c_client *client) { struct smm665_data *data = i2c_get_clientdata(client); i2c_unregister_device(data->cmdreg); return 0; } static const struct i2c_device_id smm665_id[] = { {"smm465", smm465}, {"smm665", smm665}, {"smm665c", smm665c}, {"smm764", smm764}, {"smm766", smm766}, {} }; MODULE_DEVICE_TABLE(i2c, smm665_id); /* This is the driver that will be inserted */ static struct i2c_driver smm665_driver = { .driver = { .name = "smm665", }, .probe = smm665_probe, .remove = smm665_remove, .id_table = smm665_id, }; module_i2c_driver(smm665_driver); MODULE_AUTHOR("Guenter Roeck"); MODULE_DESCRIPTION("SMM665 driver"); MODULE_LICENSE("GPL"); |