1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Hardware monitoring driver for MPS Multi-phase Digital VR Controllers 4 * 5 * Copyright (C) 2020 Nvidia Technologies Ltd. 6 */ 7 8 #include <linux/err.h> 9 #include <linux/i2c.h> 10 #include <linux/init.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include "pmbus.h" 14 15 /* Vendor specific registers. */ 16 #define MP2975_MFR_APS_HYS_R2 0x0d 17 #define MP2975_MFR_SLOPE_TRIM3 0x1d 18 #define MP2975_MFR_VR_MULTI_CONFIG_R1 0x0d 19 #define MP2975_MFR_VR_MULTI_CONFIG_R2 0x1d 20 #define MP2975_MFR_APS_DECAY_ADV 0x56 21 #define MP2975_MFR_DC_LOOP_CTRL 0x59 22 #define MP2975_MFR_OCP_UCP_PHASE_SET 0x65 23 #define MP2975_MFR_VR_CONFIG1 0x68 24 #define MP2975_MFR_READ_CS1_2 0x82 25 #define MP2975_MFR_READ_CS3_4 0x83 26 #define MP2975_MFR_READ_CS5_6 0x84 27 #define MP2975_MFR_READ_CS7_8 0x85 28 #define MP2975_MFR_READ_CS9_10 0x86 29 #define MP2975_MFR_READ_CS11_12 0x87 30 #define MP2975_MFR_READ_IOUT_PK 0x90 31 #define MP2975_MFR_READ_POUT_PK 0x91 32 #define MP2975_MFR_READ_VREF_R1 0xa1 33 #define MP2975_MFR_READ_VREF_R2 0xa3 34 #define MP2975_MFR_OVP_TH_SET 0xe5 35 #define MP2975_MFR_UVP_SET 0xe6 36 37 #define MP2975_VOUT_FORMAT BIT(15) 38 #define MP2975_VID_STEP_SEL_R1 BIT(4) 39 #define MP2975_IMVP9_EN_R1 BIT(13) 40 #define MP2975_VID_STEP_SEL_R2 BIT(3) 41 #define MP2975_IMVP9_EN_R2 BIT(12) 42 #define MP2975_PRT_THRES_DIV_OV_EN BIT(14) 43 #define MP2975_DRMOS_KCS GENMASK(13, 12) 44 #define MP2975_PROT_DEV_OV_OFF 10 45 #define MP2975_PROT_DEV_OV_ON 5 46 #define MP2975_SENSE_AMPL BIT(11) 47 #define MP2975_SENSE_AMPL_UNIT 1 48 #define MP2975_SENSE_AMPL_HALF 2 49 #define MP2975_VIN_UV_LIMIT_UNIT 8 50 51 #define MP2975_MAX_PHASE_RAIL1 8 52 #define MP2975_MAX_PHASE_RAIL2 4 53 #define MP2975_PAGE_NUM 2 54 55 #define MP2975_RAIL2_FUNC (PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | \ 56 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | \ 57 PMBUS_PHASE_VIRTUAL) 58 59 struct mp2975_data { 60 struct pmbus_driver_info info; 61 int vout_scale; 62 int vid_step[MP2975_PAGE_NUM]; 63 int vref[MP2975_PAGE_NUM]; 64 int vref_off[MP2975_PAGE_NUM]; 65 int vout_max[MP2975_PAGE_NUM]; 66 int vout_ov_fixed[MP2975_PAGE_NUM]; 67 int vout_format[MP2975_PAGE_NUM]; 68 int curr_sense_gain[MP2975_PAGE_NUM]; 69 }; 70 71 #define to_mp2975_data(x) container_of(x, struct mp2975_data, info) 72 73 static int mp2975_read_byte_data(struct i2c_client *client, int page, int reg) 74 { 75 switch (reg) { 76 case PMBUS_VOUT_MODE: 77 /* 78 * Enforce VOUT direct format, since device allows to set the 79 * different formats for the different rails. Conversion from 80 * VID to direct provided by driver internally, in case it is 81 * necessary. 82 */ 83 return PB_VOUT_MODE_DIRECT; 84 default: 85 return -ENODATA; 86 } 87 } 88 89 static int 90 mp2975_read_word_helper(struct i2c_client *client, int page, int phase, u8 reg, 91 u16 mask) 92 { 93 int ret = pmbus_read_word_data(client, page, phase, reg); 94 95 return (ret > 0) ? ret & mask : ret; 96 } 97 98 static int 99 mp2975_vid2direct(int vrf, int val) 100 { 101 switch (vrf) { 102 case vr12: 103 if (val >= 0x01) 104 return 250 + (val - 1) * 5; 105 break; 106 case vr13: 107 if (val >= 0x01) 108 return 500 + (val - 1) * 10; 109 break; 110 case imvp9: 111 if (val >= 0x01) 112 return 200 + (val - 1) * 10; 113 break; 114 default: 115 return -EINVAL; 116 } 117 return 0; 118 } 119 120 static int 121 mp2975_read_phase(struct i2c_client *client, struct mp2975_data *data, 122 int page, int phase, u8 reg) 123 { 124 int ph_curr, ret; 125 126 ret = pmbus_read_word_data(client, page, phase, reg); 127 if (ret < 0) 128 return ret; 129 130 if (!((phase + 1) % MP2975_PAGE_NUM)) 131 ret >>= 8; 132 ret &= 0xff; 133 134 /* 135 * Output value is calculated as: (READ_CSx / 80 – 1.23) / (Kcs * Rcs) 136 * where: 137 * - Kcs is the DrMOS current sense gain of power stage, which is 138 * obtained from the register MP2975_MFR_VR_CONFIG1, bits 13-12 with 139 * the following selection of DrMOS (data->curr_sense_gain[page]): 140 * 00b - 5µA/A, 01b - 8.5µA/A, 10b - 9.7µA/A, 11b - 10µA/A. 141 * - Rcs is the internal phase current sense resistor which is constant 142 * value 1kΩ. 143 */ 144 ph_curr = ret * 100 - 9800; 145 146 /* 147 * Current phase sensing, providing by the device is not accurate 148 * for the light load. This because sampling of current occurrence of 149 * bit weight has a big deviation for light load. For handling such 150 * case phase current is represented as the maximum between the value 151 * calculated above and total rail current divided by number phases. 152 */ 153 ret = pmbus_read_word_data(client, page, phase, PMBUS_READ_IOUT); 154 if (ret < 0) 155 return ret; 156 157 return max_t(int, DIV_ROUND_CLOSEST(ret, data->info.phases[page]), 158 DIV_ROUND_CLOSEST(ph_curr, data->curr_sense_gain[page])); 159 } 160 161 static int 162 mp2975_read_phases(struct i2c_client *client, struct mp2975_data *data, 163 int page, int phase) 164 { 165 int ret; 166 167 if (page) { 168 switch (phase) { 169 case 0 ... 1: 170 ret = mp2975_read_phase(client, data, page, phase, 171 MP2975_MFR_READ_CS7_8); 172 break; 173 case 2 ... 3: 174 ret = mp2975_read_phase(client, data, page, phase, 175 MP2975_MFR_READ_CS9_10); 176 break; 177 case 4 ... 5: 178 ret = mp2975_read_phase(client, data, page, phase, 179 MP2975_MFR_READ_CS11_12); 180 break; 181 default: 182 return -ENODATA; 183 } 184 } else { 185 switch (phase) { 186 case 0 ... 1: 187 ret = mp2975_read_phase(client, data, page, phase, 188 MP2975_MFR_READ_CS1_2); 189 break; 190 case 2 ... 3: 191 ret = mp2975_read_phase(client, data, page, phase, 192 MP2975_MFR_READ_CS3_4); 193 break; 194 case 4 ... 5: 195 ret = mp2975_read_phase(client, data, page, phase, 196 MP2975_MFR_READ_CS5_6); 197 break; 198 case 6 ... 7: 199 ret = mp2975_read_phase(client, data, page, phase, 200 MP2975_MFR_READ_CS7_8); 201 break; 202 case 8 ... 9: 203 ret = mp2975_read_phase(client, data, page, phase, 204 MP2975_MFR_READ_CS9_10); 205 break; 206 case 10 ... 11: 207 ret = mp2975_read_phase(client, data, page, phase, 208 MP2975_MFR_READ_CS11_12); 209 break; 210 default: 211 return -ENODATA; 212 } 213 } 214 return ret; 215 } 216 217 static int mp2975_read_word_data(struct i2c_client *client, int page, 218 int phase, int reg) 219 { 220 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 221 struct mp2975_data *data = to_mp2975_data(info); 222 int ret; 223 224 switch (reg) { 225 case PMBUS_OT_FAULT_LIMIT: 226 ret = mp2975_read_word_helper(client, page, phase, reg, 227 GENMASK(7, 0)); 228 break; 229 case PMBUS_VIN_OV_FAULT_LIMIT: 230 ret = mp2975_read_word_helper(client, page, phase, reg, 231 GENMASK(7, 0)); 232 if (ret < 0) 233 return ret; 234 235 ret = DIV_ROUND_CLOSEST(ret, MP2975_VIN_UV_LIMIT_UNIT); 236 break; 237 case PMBUS_VOUT_OV_FAULT_LIMIT: 238 /* 239 * Register provides two values for over-voltage protection 240 * threshold for fixed (ovp2) and tracking (ovp1) modes. The 241 * minimum of these two values is provided as over-voltage 242 * fault alarm. 243 */ 244 ret = mp2975_read_word_helper(client, page, phase, 245 MP2975_MFR_OVP_TH_SET, 246 GENMASK(2, 0)); 247 if (ret < 0) 248 return ret; 249 250 ret = min_t(int, data->vout_max[page] + 50 * (ret + 1), 251 data->vout_ov_fixed[page]); 252 break; 253 case PMBUS_VOUT_UV_FAULT_LIMIT: 254 ret = mp2975_read_word_helper(client, page, phase, 255 MP2975_MFR_UVP_SET, 256 GENMASK(2, 0)); 257 if (ret < 0) 258 return ret; 259 260 ret = DIV_ROUND_CLOSEST(data->vref[page] * 10 - 50 * 261 (ret + 1) * data->vout_scale, 10); 262 break; 263 case PMBUS_READ_VOUT: 264 ret = mp2975_read_word_helper(client, page, phase, reg, 265 GENMASK(11, 0)); 266 if (ret < 0) 267 return ret; 268 269 /* 270 * READ_VOUT can be provided in VID or direct format. The 271 * format type is specified by bit 15 of the register 272 * MP2975_MFR_DC_LOOP_CTRL. The driver enforces VOUT direct 273 * format, since device allows to set the different formats for 274 * the different rails and also all VOUT limits registers are 275 * provided in a direct format. In case format is VID - convert 276 * to direct. 277 */ 278 if (data->vout_format[page] == vid) 279 ret = mp2975_vid2direct(info->vrm_version[page], ret); 280 break; 281 case PMBUS_VIRT_READ_POUT_MAX: 282 ret = mp2975_read_word_helper(client, page, phase, 283 MP2975_MFR_READ_POUT_PK, 284 GENMASK(12, 0)); 285 if (ret < 0) 286 return ret; 287 288 ret = DIV_ROUND_CLOSEST(ret, 4); 289 break; 290 case PMBUS_VIRT_READ_IOUT_MAX: 291 ret = mp2975_read_word_helper(client, page, phase, 292 MP2975_MFR_READ_IOUT_PK, 293 GENMASK(12, 0)); 294 if (ret < 0) 295 return ret; 296 297 ret = DIV_ROUND_CLOSEST(ret, 4); 298 break; 299 case PMBUS_READ_IOUT: 300 ret = mp2975_read_phases(client, data, page, phase); 301 if (ret < 0) 302 return ret; 303 304 break; 305 case PMBUS_UT_WARN_LIMIT: 306 case PMBUS_UT_FAULT_LIMIT: 307 case PMBUS_VIN_UV_WARN_LIMIT: 308 case PMBUS_VIN_UV_FAULT_LIMIT: 309 case PMBUS_VOUT_UV_WARN_LIMIT: 310 case PMBUS_VOUT_OV_WARN_LIMIT: 311 case PMBUS_VIN_OV_WARN_LIMIT: 312 case PMBUS_IIN_OC_FAULT_LIMIT: 313 case PMBUS_IOUT_OC_LV_FAULT_LIMIT: 314 case PMBUS_IIN_OC_WARN_LIMIT: 315 case PMBUS_IOUT_OC_WARN_LIMIT: 316 case PMBUS_IOUT_OC_FAULT_LIMIT: 317 case PMBUS_IOUT_UC_FAULT_LIMIT: 318 case PMBUS_POUT_OP_FAULT_LIMIT: 319 case PMBUS_POUT_OP_WARN_LIMIT: 320 case PMBUS_PIN_OP_WARN_LIMIT: 321 return -ENXIO; 322 default: 323 return -ENODATA; 324 } 325 326 return ret; 327 } 328 329 static int mp2975_identify_multiphase_rail2(struct i2c_client *client) 330 { 331 int ret; 332 333 /* 334 * Identify multiphase for rail 2 - could be from 0 to 4. 335 * In case phase number is zero – only page zero is supported 336 */ 337 ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 2); 338 if (ret < 0) 339 return ret; 340 341 /* Identify multiphase for rail 2 - could be from 0 to 4. */ 342 ret = i2c_smbus_read_word_data(client, MP2975_MFR_VR_MULTI_CONFIG_R2); 343 if (ret < 0) 344 return ret; 345 346 ret &= GENMASK(2, 0); 347 return (ret >= 4) ? 4 : ret; 348 } 349 350 static void mp2975_set_phase_rail1(struct pmbus_driver_info *info) 351 { 352 int i; 353 354 for (i = 0 ; i < info->phases[0]; i++) 355 info->pfunc[i] = PMBUS_HAVE_IOUT; 356 } 357 358 static void 359 mp2975_set_phase_rail2(struct pmbus_driver_info *info, int num_phases) 360 { 361 int i; 362 363 /* Set phases for rail 2 from upper to lower. */ 364 for (i = 1; i <= num_phases; i++) 365 info->pfunc[MP2975_MAX_PHASE_RAIL1 - i] = PMBUS_HAVE_IOUT; 366 } 367 368 static int 369 mp2975_identify_multiphase(struct i2c_client *client, struct mp2975_data *data, 370 struct pmbus_driver_info *info) 371 { 372 int num_phases2, ret; 373 374 ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 2); 375 if (ret < 0) 376 return ret; 377 378 /* Identify multiphase for rail 1 - could be from 1 to 8. */ 379 ret = i2c_smbus_read_word_data(client, MP2975_MFR_VR_MULTI_CONFIG_R1); 380 if (ret <= 0) 381 return ret; 382 383 info->phases[0] = ret & GENMASK(3, 0); 384 385 /* 386 * The device provides a total of 8 PWM pins, and can be configured 387 * to different phase count applications for rail 1 and rail 2. 388 * Rail 1 can be set to 8 phases, while rail 2 can only be set to 4 389 * phases at most. When rail 1’s phase count is configured as 0, rail 390 * 1 operates with 1-phase DCM. When rail 2 phase count is configured 391 * as 0, rail 2 is disabled. 392 */ 393 if (info->phases[0] > MP2975_MAX_PHASE_RAIL1) 394 return -EINVAL; 395 396 mp2975_set_phase_rail1(info); 397 num_phases2 = min(MP2975_MAX_PHASE_RAIL1 - info->phases[0], 398 MP2975_MAX_PHASE_RAIL2); 399 if (info->phases[1] && info->phases[1] <= num_phases2) 400 mp2975_set_phase_rail2(info, num_phases2); 401 402 return 0; 403 } 404 405 static int 406 mp2975_identify_vid(struct i2c_client *client, struct mp2975_data *data, 407 struct pmbus_driver_info *info, u32 reg, int page, 408 u32 imvp_bit, u32 vr_bit) 409 { 410 int ret; 411 412 /* Identify VID mode and step selection. */ 413 ret = i2c_smbus_read_word_data(client, reg); 414 if (ret < 0) 415 return ret; 416 417 if (ret & imvp_bit) { 418 info->vrm_version[page] = imvp9; 419 data->vid_step[page] = MP2975_PROT_DEV_OV_OFF; 420 } else if (ret & vr_bit) { 421 info->vrm_version[page] = vr12; 422 data->vid_step[page] = MP2975_PROT_DEV_OV_ON; 423 } else { 424 info->vrm_version[page] = vr13; 425 data->vid_step[page] = MP2975_PROT_DEV_OV_OFF; 426 } 427 428 return 0; 429 } 430 431 static int 432 mp2975_identify_rails_vid(struct i2c_client *client, struct mp2975_data *data, 433 struct pmbus_driver_info *info) 434 { 435 int ret; 436 437 ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 2); 438 if (ret < 0) 439 return ret; 440 441 /* Identify VID mode for rail 1. */ 442 ret = mp2975_identify_vid(client, data, info, 443 MP2975_MFR_VR_MULTI_CONFIG_R1, 0, 444 MP2975_IMVP9_EN_R1, MP2975_VID_STEP_SEL_R1); 445 if (ret < 0) 446 return ret; 447 448 /* Identify VID mode for rail 2, if connected. */ 449 if (info->phases[1]) 450 ret = mp2975_identify_vid(client, data, info, 451 MP2975_MFR_VR_MULTI_CONFIG_R2, 1, 452 MP2975_IMVP9_EN_R2, 453 MP2975_VID_STEP_SEL_R2); 454 return ret; 455 } 456 457 static int 458 mp2975_current_sense_gain_get(struct i2c_client *client, 459 struct mp2975_data *data) 460 { 461 int i, ret; 462 463 /* 464 * Obtain DrMOS current sense gain of power stage from the register 465 * MP2975_MFR_VR_CONFIG1, bits 13-12. The value is selected as below: 466 * 00b - 5µA/A, 01b - 8.5µA/A, 10b - 9.7µA/A, 11b - 10µA/A. Other 467 * values are invalid. 468 */ 469 for (i = 0 ; i < data->info.pages; i++) { 470 ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i); 471 if (ret < 0) 472 return ret; 473 ret = i2c_smbus_read_word_data(client, 474 MP2975_MFR_VR_CONFIG1); 475 if (ret < 0) 476 return ret; 477 478 switch ((ret & MP2975_DRMOS_KCS) >> 12) { 479 case 0: 480 data->curr_sense_gain[i] = 50; 481 break; 482 case 1: 483 data->curr_sense_gain[i] = 85; 484 break; 485 case 2: 486 data->curr_sense_gain[i] = 97; 487 break; 488 default: 489 data->curr_sense_gain[i] = 100; 490 break; 491 } 492 } 493 494 return 0; 495 } 496 497 static int 498 mp2975_vref_get(struct i2c_client *client, struct mp2975_data *data, 499 struct pmbus_driver_info *info) 500 { 501 int ret; 502 503 ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 3); 504 if (ret < 0) 505 return ret; 506 507 /* Get voltage reference value for rail 1. */ 508 ret = i2c_smbus_read_word_data(client, MP2975_MFR_READ_VREF_R1); 509 if (ret < 0) 510 return ret; 511 512 data->vref[0] = ret * data->vid_step[0]; 513 514 /* Get voltage reference value for rail 2, if connected. */ 515 if (data->info.pages == MP2975_PAGE_NUM) { 516 ret = i2c_smbus_read_word_data(client, MP2975_MFR_READ_VREF_R2); 517 if (ret < 0) 518 return ret; 519 520 data->vref[1] = ret * data->vid_step[1]; 521 } 522 return 0; 523 } 524 525 static int 526 mp2975_vref_offset_get(struct i2c_client *client, struct mp2975_data *data, 527 int page) 528 { 529 int ret; 530 531 ret = i2c_smbus_read_word_data(client, MP2975_MFR_OVP_TH_SET); 532 if (ret < 0) 533 return ret; 534 535 switch ((ret & GENMASK(5, 3)) >> 3) { 536 case 1: 537 data->vref_off[page] = 140; 538 break; 539 case 2: 540 data->vref_off[page] = 220; 541 break; 542 case 4: 543 data->vref_off[page] = 400; 544 break; 545 default: 546 return -EINVAL; 547 } 548 return 0; 549 } 550 551 static int 552 mp2975_vout_max_get(struct i2c_client *client, struct mp2975_data *data, 553 struct pmbus_driver_info *info, int page) 554 { 555 int ret; 556 557 /* Get maximum reference voltage of VID-DAC in VID format. */ 558 ret = i2c_smbus_read_word_data(client, PMBUS_VOUT_MAX); 559 if (ret < 0) 560 return ret; 561 562 data->vout_max[page] = mp2975_vid2direct(info->vrm_version[page], ret & 563 GENMASK(8, 0)); 564 return 0; 565 } 566 567 static int 568 mp2975_identify_vout_format(struct i2c_client *client, 569 struct mp2975_data *data, int page) 570 { 571 int ret; 572 573 ret = i2c_smbus_read_word_data(client, MP2975_MFR_DC_LOOP_CTRL); 574 if (ret < 0) 575 return ret; 576 577 if (ret & MP2975_VOUT_FORMAT) 578 data->vout_format[page] = vid; 579 else 580 data->vout_format[page] = direct; 581 return 0; 582 } 583 584 static int 585 mp2975_vout_ov_scale_get(struct i2c_client *client, struct mp2975_data *data, 586 struct pmbus_driver_info *info) 587 { 588 int thres_dev, sense_ampl, ret; 589 590 ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0); 591 if (ret < 0) 592 return ret; 593 594 /* 595 * Get divider for over- and under-voltage protection thresholds 596 * configuration from the Advanced Options of Auto Phase Shedding and 597 * decay register. 598 */ 599 ret = i2c_smbus_read_word_data(client, MP2975_MFR_APS_DECAY_ADV); 600 if (ret < 0) 601 return ret; 602 thres_dev = ret & MP2975_PRT_THRES_DIV_OV_EN ? MP2975_PROT_DEV_OV_ON : 603 MP2975_PROT_DEV_OV_OFF; 604 605 /* Select the gain of remote sense amplifier. */ 606 ret = i2c_smbus_read_word_data(client, PMBUS_VOUT_SCALE_LOOP); 607 if (ret < 0) 608 return ret; 609 sense_ampl = ret & MP2975_SENSE_AMPL ? MP2975_SENSE_AMPL_HALF : 610 MP2975_SENSE_AMPL_UNIT; 611 612 data->vout_scale = sense_ampl * thres_dev; 613 614 return 0; 615 } 616 617 static int 618 mp2975_vout_per_rail_config_get(struct i2c_client *client, 619 struct mp2975_data *data, 620 struct pmbus_driver_info *info) 621 { 622 int i, ret; 623 624 for (i = 0; i < data->info.pages; i++) { 625 ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i); 626 if (ret < 0) 627 return ret; 628 629 /* Obtain voltage reference offsets. */ 630 ret = mp2975_vref_offset_get(client, data, i); 631 if (ret < 0) 632 return ret; 633 634 /* Obtain maximum voltage values. */ 635 ret = mp2975_vout_max_get(client, data, info, i); 636 if (ret < 0) 637 return ret; 638 639 /* 640 * Get VOUT format for READ_VOUT command : VID or direct. 641 * Pages on same device can be configured with different 642 * formats. 643 */ 644 ret = mp2975_identify_vout_format(client, data, i); 645 if (ret < 0) 646 return ret; 647 648 /* 649 * Set over-voltage fixed value. Thresholds are provided as 650 * fixed value, and tracking value. The minimum of them are 651 * exposed as over-voltage critical threshold. 652 */ 653 data->vout_ov_fixed[i] = data->vref[i] + 654 DIV_ROUND_CLOSEST(data->vref_off[i] * 655 data->vout_scale, 656 10); 657 } 658 659 return 0; 660 } 661 662 static struct pmbus_driver_info mp2975_info = { 663 .pages = 1, 664 .format[PSC_VOLTAGE_IN] = linear, 665 .format[PSC_VOLTAGE_OUT] = direct, 666 .format[PSC_TEMPERATURE] = direct, 667 .format[PSC_CURRENT_IN] = linear, 668 .format[PSC_CURRENT_OUT] = direct, 669 .format[PSC_POWER] = direct, 670 .m[PSC_TEMPERATURE] = 1, 671 .m[PSC_VOLTAGE_OUT] = 1, 672 .R[PSC_VOLTAGE_OUT] = 3, 673 .m[PSC_CURRENT_OUT] = 1, 674 .m[PSC_POWER] = 1, 675 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 676 PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 677 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_POUT | 678 PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT | PMBUS_PHASE_VIRTUAL, 679 .read_byte_data = mp2975_read_byte_data, 680 .read_word_data = mp2975_read_word_data, 681 }; 682 683 static int mp2975_probe(struct i2c_client *client) 684 { 685 struct pmbus_driver_info *info; 686 struct mp2975_data *data; 687 int ret; 688 689 data = devm_kzalloc(&client->dev, sizeof(struct mp2975_data), 690 GFP_KERNEL); 691 if (!data) 692 return -ENOMEM; 693 694 memcpy(&data->info, &mp2975_info, sizeof(*info)); 695 info = &data->info; 696 697 /* Identify multiphase configuration for rail 2. */ 698 ret = mp2975_identify_multiphase_rail2(client); 699 if (ret < 0) 700 return ret; 701 702 if (ret) { 703 /* Two rails are connected. */ 704 data->info.pages = MP2975_PAGE_NUM; 705 data->info.phases[1] = ret; 706 data->info.func[1] = MP2975_RAIL2_FUNC; 707 } 708 709 /* Identify multiphase configuration. */ 710 ret = mp2975_identify_multiphase(client, data, info); 711 if (ret) 712 return ret; 713 714 /* Identify VID setting per rail. */ 715 ret = mp2975_identify_rails_vid(client, data, info); 716 if (ret < 0) 717 return ret; 718 719 /* Obtain current sense gain of power stage. */ 720 ret = mp2975_current_sense_gain_get(client, data); 721 if (ret) 722 return ret; 723 724 /* Obtain voltage reference values. */ 725 ret = mp2975_vref_get(client, data, info); 726 if (ret) 727 return ret; 728 729 /* Obtain vout over-voltage scales. */ 730 ret = mp2975_vout_ov_scale_get(client, data, info); 731 if (ret < 0) 732 return ret; 733 734 /* Obtain offsets, maximum and format for vout. */ 735 ret = mp2975_vout_per_rail_config_get(client, data, info); 736 if (ret) 737 return ret; 738 739 return pmbus_do_probe(client, info); 740 } 741 742 static const struct i2c_device_id mp2975_id[] = { 743 {"mp2975", 0}, 744 {} 745 }; 746 747 MODULE_DEVICE_TABLE(i2c, mp2975_id); 748 749 static const struct of_device_id __maybe_unused mp2975_of_match[] = { 750 {.compatible = "mps,mp2975"}, 751 {} 752 }; 753 MODULE_DEVICE_TABLE(of, mp2975_of_match); 754 755 static struct i2c_driver mp2975_driver = { 756 .driver = { 757 .name = "mp2975", 758 .of_match_table = of_match_ptr(mp2975_of_match), 759 }, 760 .probe_new = mp2975_probe, 761 .id_table = mp2975_id, 762 }; 763 764 module_i2c_driver(mp2975_driver); 765 766 MODULE_AUTHOR("Vadim Pasternak <vadimp@nvidia.com>"); 767 MODULE_DESCRIPTION("PMBus driver for MPS MP2975 device"); 768 MODULE_LICENSE("GPL"); 769