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ltc2978.c
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linux-6.19.14/drivers/hwmon/pmbus/ltc2978.c
1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Hardware monitoring driver for LTC2978 and compatible chips. 4 * 5 * Copyright (c) 2011 Ericsson AB. 6 * Copyright (c) 2013, 2014, 2015 Guenter Roeck 7 * Copyright (c) 2015 Linear Technology 8 * Copyright (c) 2018 Analog Devices Inc. 9 */ 10 11#include <linux/delay.h> 12#include <linux/jiffies.h> 13#include <linux/kernel.h> 14#include <linux/module.h> 15#include <linux/init.h> 16#include <linux/err.h> 17#include <linux/slab.h> 18#include <linux/i2c.h> 19#include <linux/regulator/driver.h> 20#include "pmbus.h" 21 22enum chips { 23 /* Managers */ 24 ltc2972, ltc2974, ltc2975, ltc2977, ltc2978, ltc2979, ltc2980, 25 /* Controllers */ 26 lt7170, lt7171, ltc3880, ltc3882, ltc3883, ltc3884, ltc3886, ltc3887, 27 ltc3889, ltc7132, ltc7841, ltc7880, 28 /* Modules */ 29 ltm2987, ltm4664, ltm4673, ltm4675, ltm4676, ltm4677, ltm4678, ltm4680, 30 ltm4686, ltm4700, 31}; 32 33/* Common for all chips */ 34#define LTC2978_MFR_VOUT_PEAK 0xdd 35#define LTC2978_MFR_VIN_PEAK 0xde 36#define LTC2978_MFR_TEMPERATURE_PEAK 0xdf 37#define LTC2978_MFR_SPECIAL_ID 0xe7 /* Undocumented on LTC3882 */ 38#define LTC2978_MFR_COMMON 0xef 39 40/* LTC2974, LTC2975, LCT2977, LTC2980, LTC2978, and LTM2987 */ 41#define LTC2978_MFR_VOUT_MIN 0xfb 42#define LTC2978_MFR_VIN_MIN 0xfc 43#define LTC2978_MFR_TEMPERATURE_MIN 0xfd 44 45/* LTC2974, LTC2975 */ 46#define LTC2974_MFR_IOUT_PEAK 0xd7 47#define LTC2974_MFR_IOUT_MIN 0xd8 48 49/* LTC3880, LTC3882, LTC3883, LTC3887, LTM4675, LTM4676, LTC7132 */ 50#define LTC3880_MFR_IOUT_PEAK 0xd7 51#define LTC3880_MFR_CLEAR_PEAKS 0xe3 52#define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4 53 54/* LTC3883, LTC3884, LTC3886, LTC3889, LTC7132, LTC7841 and LTC7880 only */ 55#define LTC3883_MFR_IIN_PEAK 0xe1 56 57/* LTC2975 only */ 58#define LTC2975_MFR_IIN_PEAK 0xc4 59#define LTC2975_MFR_IIN_MIN 0xc5 60#define LTC2975_MFR_PIN_PEAK 0xc6 61#define LTC2975_MFR_PIN_MIN 0xc7 62 63#define LTC2978_ID_MASK 0xfff0 64 65#define LT7170_ID 0x1C10 66#define LTC2972_ID 0x0310 67#define LTC2974_ID 0x0210 68#define LTC2975_ID 0x0220 69#define LTC2977_ID 0x0130 70#define LTC2978_ID_REV1 0x0110 /* Early revision */ 71#define LTC2978_ID_REV2 0x0120 72#define LTC2979_ID_A 0x8060 73#define LTC2979_ID_B 0x8070 74#define LTC2980_ID_A 0x8030 /* A/B for two die IDs */ 75#define LTC2980_ID_B 0x8040 76#define LTC3880_ID 0x4020 77#define LTC3882_ID 0x4200 78#define LTC3882_ID_D1 0x4240 /* Dash 1 */ 79#define LTC3883_ID 0x4300 80#define LTC3884_ID 0x4C00 81#define LTC3886_ID 0x4600 82#define LTC3887_ID 0x4700 83#define LTC3889_ID 0x4900 84#define LTC7132_ID 0x4CE0 85#define LTC7841_ID 0x40D0 86#define LTC7880_ID 0x49E0 87#define LTM2987_ID_A 0x8010 /* A/B for two die IDs */ 88#define LTM2987_ID_B 0x8020 89#define LTM4664_ID 0x4120 90#define LTM4673_ID_REV1 0x0230 91#define LTM4673_ID 0x4480 92#define LTM4675_ID 0x47a0 93#define LTM4676_ID_REV1 0x4400 94#define LTM4676_ID_REV2 0x4480 95#define LTM4676A_ID 0x47e0 96#define LTM4677_ID_REV1 0x47B0 97#define LTM4677_ID_REV2 0x47D0 98#define LTM4678_ID_REV1 0x4100 99#define LTM4678_ID_REV2 0x4110 100#define LTM4680_ID 0x4140 101#define LTM4686_ID 0x4770 102#define LTM4700_ID 0x4130 103 104#define LTC2972_NUM_PAGES 2 105#define LTC2974_NUM_PAGES 4 106#define LTC2978_NUM_PAGES 8 107#define LTC3880_NUM_PAGES 2 108#define LTC3883_NUM_PAGES 1 109 110#define LTC_POLL_TIMEOUT 100 /* in milli-seconds */ 111 112#define LTC_NOT_BUSY BIT(6) 113#define LTC_NOT_PENDING BIT(5) 114 115/* 116 * LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which 117 * happens pretty much each time chip data is updated. Raw peak data therefore 118 * does not provide much value. To be able to provide useful peak data, keep an 119 * internal cache of measured peak data, which is only cleared if an explicit 120 * "clear peak" command is executed for the sensor in question. 121 */ 122 123struct ltc2978_data { 124 enum chips id; 125 u16 vin_min, vin_max; 126 u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES]; 127 u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES]; 128 u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES]; 129 u16 iin_min, iin_max; 130 u16 pin_min, pin_max; 131 u16 temp2_max; 132 struct pmbus_driver_info info; 133 u32 features; 134}; 135#define to_ltc2978_data(x) container_of(x, struct ltc2978_data, info) 136 137#define FEAT_CLEAR_PEAKS BIT(0) 138#define FEAT_NEEDS_POLLING BIT(1) 139 140#define has_clear_peaks(d) ((d)->features & FEAT_CLEAR_PEAKS) 141#define needs_polling(d) ((d)->features & FEAT_NEEDS_POLLING) 142 143static int ltc_wait_ready(struct i2c_client *client) 144{ 145 unsigned long timeout = jiffies + msecs_to_jiffies(LTC_POLL_TIMEOUT); 146 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 147 struct ltc2978_data *data = to_ltc2978_data(info); 148 int status; 149 u8 mask; 150 151 if (!needs_polling(data)) 152 return 0; 153 154 /* 155 * LTC3883 does not support LTC_NOT_PENDING, even though 156 * the datasheet claims that it does. 157 */ 158 mask = LTC_NOT_BUSY; 159 if (data->id != ltc3883) 160 mask |= LTC_NOT_PENDING; 161 162 do { 163 status = pmbus_read_byte_data(client, 0, LTC2978_MFR_COMMON); 164 if (status == -EBADMSG || status == -ENXIO) { 165 /* PEC error or NACK: chip may be busy, try again */ 166 usleep_range(50, 100); 167 continue; 168 } 169 if (status < 0) 170 return status; 171 172 if ((status & mask) == mask) 173 return 0; 174 175 usleep_range(50, 100); 176 } while (time_before(jiffies, timeout)); 177 178 return -ETIMEDOUT; 179} 180 181static int ltc_read_word_data(struct i2c_client *client, int page, int phase, 182 int reg) 183{ 184 int ret; 185 186 ret = ltc_wait_ready(client); 187 if (ret < 0) 188 return ret; 189 190 return pmbus_read_word_data(client, page, 0xff, reg); 191} 192 193static int ltc_read_byte_data(struct i2c_client *client, int page, int reg) 194{ 195 int ret; 196 197 ret = ltc_wait_ready(client); 198 if (ret < 0) 199 return ret; 200 201 return pmbus_read_byte_data(client, page, reg); 202} 203 204static int ltc_write_byte_data(struct i2c_client *client, int page, int reg, u8 value) 205{ 206 int ret; 207 208 ret = ltc_wait_ready(client); 209 if (ret < 0) 210 return ret; 211 212 return pmbus_write_byte_data(client, page, reg, value); 213} 214 215static int ltc_write_byte(struct i2c_client *client, int page, u8 byte) 216{ 217 int ret; 218 219 ret = ltc_wait_ready(client); 220 if (ret < 0) 221 return ret; 222 223 return pmbus_write_byte(client, page, byte); 224} 225 226static inline int lin11_to_val(int data) 227{ 228 s16 e = ((s16)data) >> 11; 229 s32 m = (((s16)(data << 5)) >> 5); 230 231 /* 232 * mantissa is 10 bit + sign, exponent adds up to 15 bit. 233 * Add 6 bit to exponent for maximum accuracy (10 + 15 + 6 = 31). 234 */ 235 e += 6; 236 return (e < 0 ? m >> -e : m << e); 237} 238 239static int ltc_get_max(struct ltc2978_data *data, struct i2c_client *client, 240 int page, int reg, u16 *pmax) 241{ 242 int ret; 243 244 ret = ltc_read_word_data(client, page, 0xff, reg); 245 if (ret >= 0) { 246 if (lin11_to_val(ret) > lin11_to_val(*pmax)) 247 *pmax = ret; 248 ret = *pmax; 249 } 250 return ret; 251} 252 253static int ltc_get_min(struct ltc2978_data *data, struct i2c_client *client, 254 int page, int reg, u16 *pmin) 255{ 256 int ret; 257 258 ret = ltc_read_word_data(client, page, 0xff, reg); 259 if (ret >= 0) { 260 if (lin11_to_val(ret) < lin11_to_val(*pmin)) 261 *pmin = ret; 262 ret = *pmin; 263 } 264 return ret; 265} 266 267static int ltc2978_read_word_data_common(struct i2c_client *client, int page, 268 int reg) 269{ 270 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 271 struct ltc2978_data *data = to_ltc2978_data(info); 272 int ret; 273 274 switch (reg) { 275 case PMBUS_VIRT_READ_VIN_MAX: 276 ret = ltc_get_max(data, client, page, LTC2978_MFR_VIN_PEAK, 277 &data->vin_max); 278 break; 279 case PMBUS_VIRT_READ_VOUT_MAX: 280 ret = ltc_read_word_data(client, page, 0xff, 281 LTC2978_MFR_VOUT_PEAK); 282 if (ret >= 0) { 283 /* 284 * VOUT is 16 bit unsigned with fixed exponent, 285 * so we can compare it directly 286 */ 287 if (ret > data->vout_max[page]) 288 data->vout_max[page] = ret; 289 ret = data->vout_max[page]; 290 } 291 break; 292 case PMBUS_VIRT_READ_TEMP_MAX: 293 ret = ltc_get_max(data, client, page, 294 LTC2978_MFR_TEMPERATURE_PEAK, 295 &data->temp_max[page]); 296 break; 297 case PMBUS_VIRT_RESET_VOUT_HISTORY: 298 case PMBUS_VIRT_RESET_VIN_HISTORY: 299 case PMBUS_VIRT_RESET_TEMP_HISTORY: 300 ret = 0; 301 break; 302 default: 303 ret = ltc_wait_ready(client); 304 if (ret < 0) 305 return ret; 306 ret = -ENODATA; 307 break; 308 } 309 return ret; 310} 311 312static int ltc2978_read_word_data(struct i2c_client *client, int page, 313 int phase, int reg) 314{ 315 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 316 struct ltc2978_data *data = to_ltc2978_data(info); 317 int ret; 318 319 switch (reg) { 320 case PMBUS_VIRT_READ_VIN_MIN: 321 ret = ltc_get_min(data, client, page, LTC2978_MFR_VIN_MIN, 322 &data->vin_min); 323 break; 324 case PMBUS_VIRT_READ_VOUT_MIN: 325 ret = ltc_read_word_data(client, page, phase, 326 LTC2978_MFR_VOUT_MIN); 327 if (ret >= 0) { 328 /* 329 * VOUT_MIN is known to not be supported on some lots 330 * of LTC2978 revision 1, and will return the maximum 331 * possible voltage if read. If VOUT_MAX is valid and 332 * lower than the reading of VOUT_MIN, use it instead. 333 */ 334 if (data->vout_max[page] && ret > data->vout_max[page]) 335 ret = data->vout_max[page]; 336 if (ret < data->vout_min[page]) 337 data->vout_min[page] = ret; 338 ret = data->vout_min[page]; 339 } 340 break; 341 case PMBUS_VIRT_READ_TEMP_MIN: 342 ret = ltc_get_min(data, client, page, 343 LTC2978_MFR_TEMPERATURE_MIN, 344 &data->temp_min[page]); 345 break; 346 case PMBUS_VIRT_READ_IOUT_MAX: 347 case PMBUS_VIRT_RESET_IOUT_HISTORY: 348 case PMBUS_VIRT_READ_TEMP2_MAX: 349 case PMBUS_VIRT_RESET_TEMP2_HISTORY: 350 ret = -ENXIO; 351 break; 352 default: 353 ret = ltc2978_read_word_data_common(client, page, reg); 354 break; 355 } 356 return ret; 357} 358 359static int ltc2974_read_word_data(struct i2c_client *client, int page, 360 int phase, int reg) 361{ 362 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 363 struct ltc2978_data *data = to_ltc2978_data(info); 364 int ret; 365 366 switch (reg) { 367 case PMBUS_VIRT_READ_IOUT_MAX: 368 ret = ltc_get_max(data, client, page, LTC2974_MFR_IOUT_PEAK, 369 &data->iout_max[page]); 370 break; 371 case PMBUS_VIRT_READ_IOUT_MIN: 372 ret = ltc_get_min(data, client, page, LTC2974_MFR_IOUT_MIN, 373 &data->iout_min[page]); 374 break; 375 case PMBUS_VIRT_RESET_IOUT_HISTORY: 376 ret = 0; 377 break; 378 default: 379 ret = ltc2978_read_word_data(client, page, phase, reg); 380 break; 381 } 382 return ret; 383} 384 385static int ltc2975_read_word_data(struct i2c_client *client, int page, 386 int phase, int reg) 387{ 388 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 389 struct ltc2978_data *data = to_ltc2978_data(info); 390 int ret; 391 392 switch (reg) { 393 case PMBUS_VIRT_READ_IIN_MAX: 394 ret = ltc_get_max(data, client, page, LTC2975_MFR_IIN_PEAK, 395 &data->iin_max); 396 break; 397 case PMBUS_VIRT_READ_IIN_MIN: 398 ret = ltc_get_min(data, client, page, LTC2975_MFR_IIN_MIN, 399 &data->iin_min); 400 break; 401 case PMBUS_VIRT_READ_PIN_MAX: 402 ret = ltc_get_max(data, client, page, LTC2975_MFR_PIN_PEAK, 403 &data->pin_max); 404 break; 405 case PMBUS_VIRT_READ_PIN_MIN: 406 ret = ltc_get_min(data, client, page, LTC2975_MFR_PIN_MIN, 407 &data->pin_min); 408 break; 409 case PMBUS_VIRT_RESET_IIN_HISTORY: 410 case PMBUS_VIRT_RESET_PIN_HISTORY: 411 ret = 0; 412 break; 413 default: 414 ret = ltc2978_read_word_data(client, page, phase, reg); 415 break; 416 } 417 return ret; 418} 419 420static int ltc3880_read_word_data(struct i2c_client *client, int page, 421 int phase, int reg) 422{ 423 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 424 struct ltc2978_data *data = to_ltc2978_data(info); 425 int ret; 426 427 switch (reg) { 428 case PMBUS_VIRT_READ_IOUT_MAX: 429 ret = ltc_get_max(data, client, page, LTC3880_MFR_IOUT_PEAK, 430 &data->iout_max[page]); 431 break; 432 case PMBUS_VIRT_READ_TEMP2_MAX: 433 ret = ltc_get_max(data, client, page, 434 LTC3880_MFR_TEMPERATURE2_PEAK, 435 &data->temp2_max); 436 break; 437 case PMBUS_VIRT_READ_VIN_MIN: 438 case PMBUS_VIRT_READ_VOUT_MIN: 439 case PMBUS_VIRT_READ_TEMP_MIN: 440 ret = -ENXIO; 441 break; 442 case PMBUS_VIRT_RESET_IOUT_HISTORY: 443 case PMBUS_VIRT_RESET_TEMP2_HISTORY: 444 ret = 0; 445 break; 446 default: 447 ret = ltc2978_read_word_data_common(client, page, reg); 448 break; 449 } 450 return ret; 451} 452 453static int ltc3883_read_word_data(struct i2c_client *client, int page, 454 int phase, int reg) 455{ 456 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 457 struct ltc2978_data *data = to_ltc2978_data(info); 458 int ret; 459 460 switch (reg) { 461 case PMBUS_VIRT_READ_IIN_MAX: 462 ret = ltc_get_max(data, client, page, LTC3883_MFR_IIN_PEAK, 463 &data->iin_max); 464 break; 465 case PMBUS_VIRT_RESET_IIN_HISTORY: 466 ret = 0; 467 break; 468 default: 469 ret = ltc3880_read_word_data(client, page, phase, reg); 470 break; 471 } 472 return ret; 473} 474 475static int ltc2978_clear_peaks(struct ltc2978_data *data, 476 struct i2c_client *client, int page) 477{ 478 int ret; 479 480 if (has_clear_peaks(data)) 481 ret = ltc_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS); 482 else 483 ret = ltc_write_byte(client, page, PMBUS_CLEAR_FAULTS); 484 485 return ret; 486} 487 488static int ltc2978_write_word_data(struct i2c_client *client, int page, 489 int reg, u16 word) 490{ 491 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 492 struct ltc2978_data *data = to_ltc2978_data(info); 493 int ret; 494 495 switch (reg) { 496 case PMBUS_VIRT_RESET_IIN_HISTORY: 497 data->iin_max = 0x7c00; 498 data->iin_min = 0x7bff; 499 ret = ltc2978_clear_peaks(data, client, 0); 500 break; 501 case PMBUS_VIRT_RESET_PIN_HISTORY: 502 data->pin_max = 0x7c00; 503 data->pin_min = 0x7bff; 504 ret = ltc2978_clear_peaks(data, client, 0); 505 break; 506 case PMBUS_VIRT_RESET_IOUT_HISTORY: 507 data->iout_max[page] = 0x7c00; 508 data->iout_min[page] = 0xfbff; 509 ret = ltc2978_clear_peaks(data, client, page); 510 break; 511 case PMBUS_VIRT_RESET_TEMP2_HISTORY: 512 data->temp2_max = 0x7c00; 513 ret = ltc2978_clear_peaks(data, client, page); 514 break; 515 case PMBUS_VIRT_RESET_VOUT_HISTORY: 516 data->vout_min[page] = 0xffff; 517 data->vout_max[page] = 0; 518 ret = ltc2978_clear_peaks(data, client, page); 519 break; 520 case PMBUS_VIRT_RESET_VIN_HISTORY: 521 data->vin_min = 0x7bff; 522 data->vin_max = 0x7c00; 523 ret = ltc2978_clear_peaks(data, client, page); 524 break; 525 case PMBUS_VIRT_RESET_TEMP_HISTORY: 526 data->temp_min[page] = 0x7bff; 527 data->temp_max[page] = 0x7c00; 528 ret = ltc2978_clear_peaks(data, client, page); 529 break; 530 default: 531 ret = ltc_wait_ready(client); 532 if (ret < 0) 533 return ret; 534 ret = -ENODATA; 535 break; 536 } 537 return ret; 538} 539 540static const struct i2c_device_id ltc2978_id[] = { 541 {"lt7170", lt7170}, 542 {"lt7171", lt7171}, 543 {"ltc2972", ltc2972}, 544 {"ltc2974", ltc2974}, 545 {"ltc2975", ltc2975}, 546 {"ltc2977", ltc2977}, 547 {"ltc2978", ltc2978}, 548 {"ltc2979", ltc2979}, 549 {"ltc2980", ltc2980}, 550 {"ltc3880", ltc3880}, 551 {"ltc3882", ltc3882}, 552 {"ltc3883", ltc3883}, 553 {"ltc3884", ltc3884}, 554 {"ltc3886", ltc3886}, 555 {"ltc3887", ltc3887}, 556 {"ltc3889", ltc3889}, 557 {"ltc7132", ltc7132}, 558 {"ltc7841", ltc7841}, 559 {"ltc7880", ltc7880}, 560 {"ltm2987", ltm2987}, 561 {"ltm4664", ltm4664}, 562 {"ltm4673", ltm4673}, 563 {"ltm4675", ltm4675}, 564 {"ltm4676", ltm4676}, 565 {"ltm4677", ltm4677}, 566 {"ltm4678", ltm4678}, 567 {"ltm4680", ltm4680}, 568 {"ltm4686", ltm4686}, 569 {"ltm4700", ltm4700}, 570 {} 571}; 572MODULE_DEVICE_TABLE(i2c, ltc2978_id); 573 574#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR) 575#define LTC2978_ADC_RES 0xFFFF 576#define LTC2978_N_ADC 122 577#define LTC2978_MAX_UV (LTC2978_ADC_RES * LTC2978_N_ADC) 578#define LTC2978_UV_STEP 1000 579#define LTC2978_N_VOLTAGES ((LTC2978_MAX_UV / LTC2978_UV_STEP) + 1) 580 581static const struct regulator_desc ltc2978_reg_desc[] = { 582 PMBUS_REGULATOR_STEP("vout", 0, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0), 583 PMBUS_REGULATOR_STEP("vout", 1, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0), 584 PMBUS_REGULATOR_STEP("vout", 2, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0), 585 PMBUS_REGULATOR_STEP("vout", 3, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0), 586 PMBUS_REGULATOR_STEP("vout", 4, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0), 587 PMBUS_REGULATOR_STEP("vout", 5, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0), 588 PMBUS_REGULATOR_STEP("vout", 6, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0), 589 PMBUS_REGULATOR_STEP("vout", 7, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0), 590}; 591 592static const struct regulator_desc ltc2978_reg_desc_default[] = { 593 PMBUS_REGULATOR("vout", 0), 594 PMBUS_REGULATOR("vout", 1), 595 PMBUS_REGULATOR("vout", 2), 596 PMBUS_REGULATOR("vout", 3), 597 PMBUS_REGULATOR("vout", 4), 598 PMBUS_REGULATOR("vout", 5), 599 PMBUS_REGULATOR("vout", 6), 600 PMBUS_REGULATOR("vout", 7), 601}; 602#endif /* CONFIG_SENSORS_LTC2978_REGULATOR */ 603 604static int ltc2978_get_id(struct i2c_client *client) 605{ 606 int chip_id; 607 608 chip_id = i2c_smbus_read_word_data(client, LTC2978_MFR_SPECIAL_ID); 609 if (chip_id < 0) { 610 const struct i2c_device_id *id; 611 u8 buf[I2C_SMBUS_BLOCK_MAX]; 612 int ret; 613 614 if (!i2c_check_functionality(client->adapter, 615 I2C_FUNC_SMBUS_READ_BLOCK_DATA)) 616 return -ENODEV; 617 618 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); 619 if (ret < 0) 620 return ret; 621 if (ret < 3 || (strncmp(buf, "LTC", 3) && strncmp(buf, "ADI", 3))) 622 return -ENODEV; 623 624 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); 625 if (ret < 0) 626 return ret; 627 for (id = <c2978_id[0]; strlen(id->name); id++) { 628 if (!strncasecmp(id->name, buf, strlen(id->name))) 629 return (int)id->driver_data; 630 } 631 return -ENODEV; 632 } 633 634 chip_id &= LTC2978_ID_MASK; 635 636 if (chip_id == LT7170_ID) { 637 u8 buf[I2C_SMBUS_BLOCK_MAX]; 638 int ret; 639 640 ret = i2c_smbus_read_i2c_block_data(client, PMBUS_IC_DEVICE_ID, 641 sizeof(buf), buf); 642 if (ret < 0) 643 return ret; 644 645 if (!strncmp(buf + 1, "LT7170", 6) || 646 !strncmp(buf + 1, "LT7170-1", 8)) 647 return lt7170; 648 if (!strncmp(buf + 1, "LT7171", 6) || 649 !strncmp(buf + 1, "LT7171-1", 8)) 650 return lt7171; 651 652 return -ENODEV; 653 } 654 655 if (chip_id == LTC2972_ID) 656 return ltc2972; 657 else if (chip_id == LTC2974_ID) 658 return ltc2974; 659 else if (chip_id == LTC2975_ID) 660 return ltc2975; 661 else if (chip_id == LTC2977_ID) 662 return ltc2977; 663 else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2) 664 return ltc2978; 665 else if (chip_id == LTC2979_ID_A || chip_id == LTC2979_ID_B) 666 return ltc2979; 667 else if (chip_id == LTC2980_ID_A || chip_id == LTC2980_ID_B) 668 return ltc2980; 669 else if (chip_id == LTC3880_ID) 670 return ltc3880; 671 else if (chip_id == LTC3882_ID || chip_id == LTC3882_ID_D1) 672 return ltc3882; 673 else if (chip_id == LTC3883_ID) 674 return ltc3883; 675 else if (chip_id == LTC3884_ID) 676 return ltc3884; 677 else if (chip_id == LTC3886_ID) 678 return ltc3886; 679 else if (chip_id == LTC3887_ID) 680 return ltc3887; 681 else if (chip_id == LTC3889_ID) 682 return ltc3889; 683 else if (chip_id == LTC7132_ID) 684 return ltc7132; 685 else if (chip_id == LTC7841_ID) 686 return ltc7841; 687 else if (chip_id == LTC7880_ID) 688 return ltc7880; 689 else if (chip_id == LTM2987_ID_A || chip_id == LTM2987_ID_B) 690 return ltm2987; 691 else if (chip_id == LTM4664_ID) 692 return ltm4664; 693 else if (chip_id == LTM4673_ID || chip_id == LTM4673_ID_REV1) 694 return ltm4673; 695 else if (chip_id == LTM4675_ID) 696 return ltm4675; 697 else if (chip_id == LTM4676_ID_REV1 || chip_id == LTM4676_ID_REV2 || 698 chip_id == LTM4676A_ID) 699 return ltm4676; 700 else if (chip_id == LTM4677_ID_REV1 || chip_id == LTM4677_ID_REV2) 701 return ltm4677; 702 else if (chip_id == LTM4678_ID_REV1 || chip_id == LTM4678_ID_REV2) 703 return ltm4678; 704 else if (chip_id == LTM4680_ID) 705 return ltm4680; 706 else if (chip_id == LTM4686_ID) 707 return ltm4686; 708 else if (chip_id == LTM4700_ID) 709 return ltm4700; 710 711 dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id); 712 return -ENODEV; 713} 714 715static int ltc2978_probe(struct i2c_client *client) 716{ 717 int i, chip_id; 718 struct ltc2978_data *data; 719 struct pmbus_driver_info *info; 720 const struct i2c_device_id *id; 721 722 if (!i2c_check_functionality(client->adapter, 723 I2C_FUNC_SMBUS_READ_WORD_DATA)) 724 return -ENODEV; 725 726 data = devm_kzalloc(&client->dev, sizeof(struct ltc2978_data), 727 GFP_KERNEL); 728 if (!data) 729 return -ENOMEM; 730 731 chip_id = ltc2978_get_id(client); 732 if (chip_id < 0) 733 return chip_id; 734 735 data->id = chip_id; 736 id = i2c_match_id(ltc2978_id, client); 737 if (data->id != id->driver_data) 738 dev_warn(&client->dev, 739 "Device mismatch: Configured %s (%d), detected %d\n", 740 id->name, 741 (int) id->driver_data, 742 chip_id); 743 744 info = &data->info; 745 info->write_word_data = ltc2978_write_word_data; 746 info->write_byte = ltc_write_byte; 747 info->write_byte_data = ltc_write_byte_data; 748 info->read_word_data = ltc_read_word_data; 749 info->read_byte_data = ltc_read_byte_data; 750 751 data->vin_min = 0x7bff; 752 data->vin_max = 0x7c00; 753 for (i = 0; i < ARRAY_SIZE(data->vout_min); i++) 754 data->vout_min[i] = 0xffff; 755 for (i = 0; i < ARRAY_SIZE(data->iout_min); i++) 756 data->iout_min[i] = 0xfbff; 757 for (i = 0; i < ARRAY_SIZE(data->iout_max); i++) 758 data->iout_max[i] = 0x7c00; 759 for (i = 0; i < ARRAY_SIZE(data->temp_min); i++) 760 data->temp_min[i] = 0x7bff; 761 for (i = 0; i < ARRAY_SIZE(data->temp_max); i++) 762 data->temp_max[i] = 0x7c00; 763 data->temp2_max = 0x7c00; 764 765 switch (data->id) { 766 case lt7170: 767 case lt7171: 768 data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING; 769 info->read_word_data = ltc3883_read_word_data; 770 info->pages = LTC3883_NUM_PAGES; 771 info->format[PSC_VOLTAGE_IN] = ieee754; 772 info->format[PSC_VOLTAGE_OUT] = ieee754; 773 info->format[PSC_CURRENT_OUT] = ieee754; 774 info->format[PSC_TEMPERATURE] = ieee754; 775 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT 776 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 777 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT 778 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; 779 break; 780 case ltc2972: 781 info->read_word_data = ltc2975_read_word_data; 782 info->pages = LTC2972_NUM_PAGES; 783 info->func[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN 784 | PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT 785 | PMBUS_HAVE_TEMP2; 786 for (i = 0; i < info->pages; i++) { 787 info->func[i] |= PMBUS_HAVE_VOUT 788 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT 789 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP 790 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT; 791 } 792 break; 793 case ltc2974: 794 info->read_word_data = ltc2974_read_word_data; 795 info->pages = LTC2974_NUM_PAGES; 796 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT 797 | PMBUS_HAVE_TEMP2; 798 for (i = 0; i < info->pages; i++) { 799 info->func[i] |= PMBUS_HAVE_VOUT 800 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT 801 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP 802 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT; 803 } 804 break; 805 case ltc2975: 806 info->read_word_data = ltc2975_read_word_data; 807 info->pages = LTC2974_NUM_PAGES; 808 info->func[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN 809 | PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT 810 | PMBUS_HAVE_TEMP2; 811 for (i = 0; i < info->pages; i++) { 812 info->func[i] |= PMBUS_HAVE_VOUT 813 | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT 814 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP 815 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT; 816 } 817 break; 818 819 case ltc2977: 820 case ltc2978: 821 case ltc2979: 822 case ltc2980: 823 case ltm2987: 824 info->read_word_data = ltc2978_read_word_data; 825 info->pages = LTC2978_NUM_PAGES; 826 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT 827 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 828 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; 829 for (i = 1; i < LTC2978_NUM_PAGES; i++) { 830 info->func[i] = PMBUS_HAVE_VOUT 831 | PMBUS_HAVE_STATUS_VOUT; 832 } 833 break; 834 case ltc3880: 835 case ltc3887: 836 case ltm4675: 837 case ltm4676: 838 case ltm4677: 839 case ltm4686: 840 data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING; 841 info->read_word_data = ltc3880_read_word_data; 842 info->pages = LTC3880_NUM_PAGES; 843 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN 844 | PMBUS_HAVE_STATUS_INPUT 845 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 846 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT 847 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP 848 | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; 849 info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 850 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT 851 | PMBUS_HAVE_POUT 852 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; 853 break; 854 case ltc3882: 855 data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING; 856 info->read_word_data = ltc3880_read_word_data; 857 info->pages = LTC3880_NUM_PAGES; 858 info->func[0] = PMBUS_HAVE_VIN 859 | PMBUS_HAVE_STATUS_INPUT 860 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 861 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT 862 | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP 863 | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; 864 info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 865 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT 866 | PMBUS_HAVE_POUT 867 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; 868 break; 869 case ltc3883: 870 data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING; 871 info->read_word_data = ltc3883_read_word_data; 872 info->pages = LTC3883_NUM_PAGES; 873 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN 874 | PMBUS_HAVE_STATUS_INPUT 875 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 876 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT 877 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP 878 | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; 879 break; 880 case ltc3884: 881 case ltc3886: 882 case ltc3889: 883 case ltc7132: 884 case ltc7880: 885 case ltm4664: 886 case ltm4678: 887 case ltm4680: 888 case ltm4700: 889 data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING; 890 info->read_word_data = ltc3883_read_word_data; 891 info->pages = LTC3880_NUM_PAGES; 892 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN 893 | PMBUS_HAVE_STATUS_INPUT 894 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 895 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT 896 | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP 897 | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; 898 info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 899 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT 900 | PMBUS_HAVE_POUT 901 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; 902 break; 903 case ltc7841: 904 data->features |= FEAT_CLEAR_PEAKS; 905 info->read_word_data = ltc3883_read_word_data; 906 info->pages = LTC3883_NUM_PAGES; 907 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN 908 | PMBUS_HAVE_STATUS_INPUT 909 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 910 | PMBUS_HAVE_IOUT 911 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; 912 break; 913 case ltm4673: 914 data->features |= FEAT_NEEDS_POLLING; 915 info->read_word_data = ltc2975_read_word_data; 916 info->pages = LTC2974_NUM_PAGES; 917 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT 918 | PMBUS_HAVE_TEMP2; 919 for (i = 0; i < info->pages; i++) { 920 info->func[i] |= PMBUS_HAVE_IIN 921 | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT 922 | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT 923 | PMBUS_HAVE_PIN 924 | PMBUS_HAVE_POUT 925 | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; 926 } 927 break; 928 default: 929 return -ENODEV; 930 } 931 932#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR) 933 info->num_regulators = info->pages; 934 switch (data->id) { 935 case ltc2972: 936 case ltc2974: 937 case ltc2975: 938 case ltc2977: 939 case ltc2978: 940 case ltc2979: 941 case ltc2980: 942 case ltm2987: 943 info->reg_desc = ltc2978_reg_desc; 944 if (info->num_regulators > ARRAY_SIZE(ltc2978_reg_desc)) { 945 dev_warn(&client->dev, "num_regulators too large!"); 946 info->num_regulators = ARRAY_SIZE(ltc2978_reg_desc); 947 } 948 break; 949 default: 950 info->reg_desc = ltc2978_reg_desc_default; 951 if (info->num_regulators > ARRAY_SIZE(ltc2978_reg_desc_default)) { 952 dev_warn(&client->dev, "num_regulators too large!"); 953 info->num_regulators = 954 ARRAY_SIZE(ltc2978_reg_desc_default); 955 } 956 break; 957 } 958#endif 959 960 return pmbus_do_probe(client, info); 961} 962 963 964#ifdef CONFIG_OF 965static const struct of_device_id ltc2978_of_match[] = { 966 { .compatible = "lltc,lt7170" }, 967 { .compatible = "lltc,lt7171" }, 968 { .compatible = "lltc,ltc2972" }, 969 { .compatible = "lltc,ltc2974" }, 970 { .compatible = "lltc,ltc2975" }, 971 { .compatible = "lltc,ltc2977" }, 972 { .compatible = "lltc,ltc2978" }, 973 { .compatible = "lltc,ltc2979" }, 974 { .compatible = "lltc,ltc2980" }, 975 { .compatible = "lltc,ltc3880" }, 976 { .compatible = "lltc,ltc3882" }, 977 { .compatible = "lltc,ltc3883" }, 978 { .compatible = "lltc,ltc3884" }, 979 { .compatible = "lltc,ltc3886" }, 980 { .compatible = "lltc,ltc3887" }, 981 { .compatible = "lltc,ltc3889" }, 982 { .compatible = "lltc,ltc7132" }, 983 { .compatible = "lltc,ltc7841" }, 984 { .compatible = "lltc,ltc7880" }, 985 { .compatible = "lltc,ltm2987" }, 986 { .compatible = "lltc,ltm4664" }, 987 { .compatible = "lltc,ltm4673" }, 988 { .compatible = "lltc,ltm4675" }, 989 { .compatible = "lltc,ltm4676" }, 990 { .compatible = "lltc,ltm4677" }, 991 { .compatible = "lltc,ltm4678" }, 992 { .compatible = "lltc,ltm4680" }, 993 { .compatible = "lltc,ltm4686" }, 994 { .compatible = "lltc,ltm4700" }, 995 { } 996}; 997MODULE_DEVICE_TABLE(of, ltc2978_of_match); 998#endif 999 1000static struct i2c_driver ltc2978_driver = { 1001 .driver = { 1002 .name = "ltc2978", 1003 .of_match_table = of_match_ptr(ltc2978_of_match), 1004 }, 1005 .probe = ltc2978_probe, 1006 .id_table = ltc2978_id, 1007}; 1008 1009module_i2c_driver(ltc2978_driver); 1010 1011MODULE_AUTHOR("Guenter Roeck"); 1012MODULE_DESCRIPTION("PMBus driver for LTC2978 and compatible chips"); 1013MODULE_LICENSE("GPL"); 1014MODULE_IMPORT_NS("PMBUS");
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