1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Driver for MAX20710, MAX20730, MAX20734, and MAX20743 Integrated, 4 * Step-Down Switching Regulators 5 * 6 * Copyright 2019 Google LLC. 7 * Copyright 2020 Maxim Integrated 8 */ 9 10#include <linux/bits.h> 11#include <linux/debugfs.h> 12#include <linux/err.h> 13#include <linux/i2c.h> 14#include <linux/init.h> 15#include <linux/kernel.h> 16#include <linux/module.h> 17#include <linux/mutex.h> 18#include <linux/of.h> 19#include <linux/pmbus.h> 20#include <linux/util_macros.h> 21#include "pmbus.h" 22 23enum chips { 24 max20710, 25 max20730, 26 max20734, 27 max20743 28}; 29 30enum { 31 MAX20730_DEBUGFS_VOUT_MIN = 0, 32 MAX20730_DEBUGFS_FREQUENCY, 33 MAX20730_DEBUGFS_PG_DELAY, 34 MAX20730_DEBUGFS_INTERNAL_GAIN, 35 MAX20730_DEBUGFS_BOOT_VOLTAGE, 36 MAX20730_DEBUGFS_OUT_V_RAMP_RATE, 37 MAX20730_DEBUGFS_OC_PROTECT_MODE, 38 MAX20730_DEBUGFS_SS_TIMING, 39 MAX20730_DEBUGFS_IMAX, 40 MAX20730_DEBUGFS_OPERATION, 41 MAX20730_DEBUGFS_ON_OFF_CONFIG, 42 MAX20730_DEBUGFS_SMBALERT_MASK, 43 MAX20730_DEBUGFS_VOUT_MODE, 44 MAX20730_DEBUGFS_VOUT_COMMAND, 45 MAX20730_DEBUGFS_VOUT_MAX, 46 MAX20730_DEBUGFS_NUM_ENTRIES 47}; 48 49struct max20730_data { 50 enum chips id; 51 struct pmbus_driver_info info; 52 struct mutex lock; /* Used to protect against parallel writes */ 53 u16 mfr_devset1; 54 u16 mfr_devset2; 55 u16 mfr_voutmin; 56 u32 vout_voltage_divider[2]; 57}; 58 59#define to_max20730_data(x) container_of(x, struct max20730_data, info) 60 61#define VOLT_FROM_REG(val) DIV_ROUND_CLOSEST((val), 1 << 9) 62 63#define PMBUS_SMB_ALERT_MASK 0x1B 64 65#define MAX20730_MFR_VOUT_MIN 0xd1 66#define MAX20730_MFR_DEVSET1 0xd2 67#define MAX20730_MFR_DEVSET2 0xd3 68 69#define MAX20730_MFR_VOUT_MIN_MASK GENMASK(9, 0) 70#define MAX20730_MFR_VOUT_MIN_BIT_POS 0 71 72#define MAX20730_MFR_DEVSET1_RGAIN_MASK (BIT(13) | BIT(14)) 73#define MAX20730_MFR_DEVSET1_OTP_MASK (BIT(11) | BIT(12)) 74#define MAX20730_MFR_DEVSET1_VBOOT_MASK (BIT(8) | BIT(9)) 75#define MAX20730_MFR_DEVSET1_OCP_MASK (BIT(5) | BIT(6)) 76#define MAX20730_MFR_DEVSET1_FSW_MASK GENMASK(4, 2) 77#define MAX20730_MFR_DEVSET1_TSTAT_MASK (BIT(0) | BIT(1)) 78 79#define MAX20730_MFR_DEVSET1_RGAIN_BIT_POS 13 80#define MAX20730_MFR_DEVSET1_OTP_BIT_POS 11 81#define MAX20730_MFR_DEVSET1_VBOOT_BIT_POS 8 82#define MAX20730_MFR_DEVSET1_OCP_BIT_POS 5 83#define MAX20730_MFR_DEVSET1_FSW_BIT_POS 2 84#define MAX20730_MFR_DEVSET1_TSTAT_BIT_POS 0 85 86#define MAX20730_MFR_DEVSET2_IMAX_MASK GENMASK(10, 8) 87#define MAX20730_MFR_DEVSET2_VRATE (BIT(6) | BIT(7)) 88#define MAX20730_MFR_DEVSET2_OCPM_MASK BIT(5) 89#define MAX20730_MFR_DEVSET2_SS_MASK (BIT(0) | BIT(1)) 90 91#define MAX20730_MFR_DEVSET2_IMAX_BIT_POS 8 92#define MAX20730_MFR_DEVSET2_VRATE_BIT_POS 6 93#define MAX20730_MFR_DEVSET2_OCPM_BIT_POS 5 94#define MAX20730_MFR_DEVSET2_SS_BIT_POS 0 95 96#define DEBUG_FS_DATA_MAX 16 97 98struct max20730_debugfs_data { 99 struct i2c_client *client; 100 int debugfs_entries[MAX20730_DEBUGFS_NUM_ENTRIES]; 101}; 102 103#define to_psu(x, y) container_of((x), \ 104 struct max20730_debugfs_data, debugfs_entries[(y)]) 105 106#ifdef CONFIG_DEBUG_FS 107static ssize_t max20730_debugfs_read(struct file *file, char __user *buf, 108 size_t count, loff_t *ppos) 109{ 110 int ret, len; 111 int *idxp = file->private_data; 112 int idx = *idxp; 113 struct max20730_debugfs_data *psu = to_psu(idxp, idx); 114 const struct pmbus_driver_info *info; 115 const struct max20730_data *data; 116 char tbuf[DEBUG_FS_DATA_MAX] = { 0 }; 117 char *result = tbuf; 118 u16 val; 119 120 info = pmbus_get_driver_info(psu->client); 121 data = to_max20730_data(info); 122 123 switch (idx) { 124 case MAX20730_DEBUGFS_VOUT_MIN: 125 ret = VOLT_FROM_REG(data->mfr_voutmin * 10000); 126 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d.%d\n", 127 ret / 10000, ret % 10000); 128 break; 129 case MAX20730_DEBUGFS_FREQUENCY: 130 val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_FSW_MASK) 131 >> MAX20730_MFR_DEVSET1_FSW_BIT_POS; 132 133 if (val == 0) 134 ret = 400; 135 else if (val == 1) 136 ret = 500; 137 else if (val == 2 || val == 3) 138 ret = 600; 139 else if (val == 4) 140 ret = 700; 141 else if (val == 5) 142 ret = 800; 143 else 144 ret = 900; 145 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret); 146 break; 147 case MAX20730_DEBUGFS_PG_DELAY: 148 val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_TSTAT_MASK) 149 >> MAX20730_MFR_DEVSET1_TSTAT_BIT_POS; 150 151 if (val == 0) 152 result = "2000\n"; 153 else if (val == 1) 154 result = "125\n"; 155 else if (val == 2) 156 result = "62.5\n"; 157 else 158 result = "32\n"; 159 break; 160 case MAX20730_DEBUGFS_INTERNAL_GAIN: 161 val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_RGAIN_MASK) 162 >> MAX20730_MFR_DEVSET1_RGAIN_BIT_POS; 163 164 if (data->id == max20734) { 165 /* AN6209 */ 166 if (val == 0) 167 result = "0.8\n"; 168 else if (val == 1) 169 result = "3.2\n"; 170 else if (val == 2) 171 result = "1.6\n"; 172 else 173 result = "6.4\n"; 174 } else if (data->id == max20730 || data->id == max20710) { 175 /* AN6042 or AN6140 */ 176 if (val == 0) 177 result = "0.9\n"; 178 else if (val == 1) 179 result = "3.6\n"; 180 else if (val == 2) 181 result = "1.8\n"; 182 else 183 result = "7.2\n"; 184 } else if (data->id == max20743) { 185 /* AN6042 */ 186 if (val == 0) 187 result = "0.45\n"; 188 else if (val == 1) 189 result = "1.8\n"; 190 else if (val == 2) 191 result = "0.9\n"; 192 else 193 result = "3.6\n"; 194 } else { 195 result = "Not supported\n"; 196 } 197 break; 198 case MAX20730_DEBUGFS_BOOT_VOLTAGE: 199 val = (data->mfr_devset1 & MAX20730_MFR_DEVSET1_VBOOT_MASK) 200 >> MAX20730_MFR_DEVSET1_VBOOT_BIT_POS; 201 202 if (val == 0) 203 result = "0.6484\n"; 204 else if (val == 1) 205 result = "0.8984\n"; 206 else if (val == 2) 207 result = "1.0\n"; 208 else 209 result = "Invalid\n"; 210 break; 211 case MAX20730_DEBUGFS_OUT_V_RAMP_RATE: 212 val = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_VRATE) 213 >> MAX20730_MFR_DEVSET2_VRATE_BIT_POS; 214 215 if (val == 0) 216 result = "4\n"; 217 else if (val == 1) 218 result = "2\n"; 219 else if (val == 2) 220 result = "1\n"; 221 else 222 result = "Invalid\n"; 223 break; 224 case MAX20730_DEBUGFS_OC_PROTECT_MODE: 225 ret = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_OCPM_MASK) 226 >> MAX20730_MFR_DEVSET2_OCPM_BIT_POS; 227 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret); 228 break; 229 case MAX20730_DEBUGFS_SS_TIMING: 230 val = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_SS_MASK) 231 >> MAX20730_MFR_DEVSET2_SS_BIT_POS; 232 233 if (val == 0) 234 result = "0.75\n"; 235 else if (val == 1) 236 result = "1.5\n"; 237 else if (val == 2) 238 result = "3\n"; 239 else 240 result = "6\n"; 241 break; 242 case MAX20730_DEBUGFS_IMAX: 243 ret = (data->mfr_devset2 & MAX20730_MFR_DEVSET2_IMAX_MASK) 244 >> MAX20730_MFR_DEVSET2_IMAX_BIT_POS; 245 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret); 246 break; 247 case MAX20730_DEBUGFS_OPERATION: 248 ret = i2c_smbus_read_byte_data(psu->client, PMBUS_OPERATION); 249 if (ret < 0) 250 return ret; 251 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret); 252 break; 253 case MAX20730_DEBUGFS_ON_OFF_CONFIG: 254 ret = i2c_smbus_read_byte_data(psu->client, PMBUS_ON_OFF_CONFIG); 255 if (ret < 0) 256 return ret; 257 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret); 258 break; 259 case MAX20730_DEBUGFS_SMBALERT_MASK: 260 ret = i2c_smbus_read_word_data(psu->client, 261 PMBUS_SMB_ALERT_MASK); 262 if (ret < 0) 263 return ret; 264 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret); 265 break; 266 case MAX20730_DEBUGFS_VOUT_MODE: 267 ret = i2c_smbus_read_byte_data(psu->client, PMBUS_VOUT_MODE); 268 if (ret < 0) 269 return ret; 270 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, "%d\n", ret); 271 break; 272 case MAX20730_DEBUGFS_VOUT_COMMAND: 273 ret = i2c_smbus_read_word_data(psu->client, PMBUS_VOUT_COMMAND); 274 if (ret < 0) 275 return ret; 276 277 ret = VOLT_FROM_REG(ret * 10000); 278 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, 279 "%d.%d\n", ret / 10000, ret % 10000); 280 break; 281 case MAX20730_DEBUGFS_VOUT_MAX: 282 ret = i2c_smbus_read_word_data(psu->client, PMBUS_VOUT_MAX); 283 if (ret < 0) 284 return ret; 285 286 ret = VOLT_FROM_REG(ret * 10000); 287 len = scnprintf(tbuf, DEBUG_FS_DATA_MAX, 288 "%d.%d\n", ret / 10000, ret % 10000); 289 break; 290 default: 291 result = "Invalid\n"; 292 } 293 294 len = strlen(result); 295 return simple_read_from_buffer(buf, count, ppos, result, len); 296} 297 298static const struct file_operations max20730_fops = { 299 .llseek = noop_llseek, 300 .read = max20730_debugfs_read, 301 .write = NULL, 302 .open = simple_open, 303}; 304 305static int max20730_init_debugfs(struct i2c_client *client, 306 struct max20730_data *data) 307{ 308 int ret, i; 309 struct dentry *debugfs; 310 struct dentry *max20730_dir; 311 struct max20730_debugfs_data *psu; 312 313 ret = i2c_smbus_read_word_data(client, MAX20730_MFR_DEVSET2); 314 if (ret < 0) 315 return ret; 316 data->mfr_devset2 = ret; 317 318 ret = i2c_smbus_read_word_data(client, MAX20730_MFR_VOUT_MIN); 319 if (ret < 0) 320 return ret; 321 data->mfr_voutmin = ret; 322 323 psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL); 324 if (!psu) 325 return -ENOMEM; 326 psu->client = client; 327 328 debugfs = pmbus_get_debugfs_dir(client); 329 if (!debugfs) 330 return -ENOENT; 331 332 max20730_dir = debugfs_create_dir(client->name, debugfs); 333 334 for (i = 0; i < MAX20730_DEBUGFS_NUM_ENTRIES; ++i) 335 psu->debugfs_entries[i] = i; 336 337 debugfs_create_file("vout_min", 0444, max20730_dir, 338 &psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_MIN], 339 &max20730_fops); 340 debugfs_create_file("frequency", 0444, max20730_dir, 341 &psu->debugfs_entries[MAX20730_DEBUGFS_FREQUENCY], 342 &max20730_fops); 343 debugfs_create_file("power_good_delay", 0444, max20730_dir, 344 &psu->debugfs_entries[MAX20730_DEBUGFS_PG_DELAY], 345 &max20730_fops); 346 debugfs_create_file("internal_gain", 0444, max20730_dir, 347 &psu->debugfs_entries[MAX20730_DEBUGFS_INTERNAL_GAIN], 348 &max20730_fops); 349 debugfs_create_file("boot_voltage", 0444, max20730_dir, 350 &psu->debugfs_entries[MAX20730_DEBUGFS_BOOT_VOLTAGE], 351 &max20730_fops); 352 debugfs_create_file("out_voltage_ramp_rate", 0444, max20730_dir, 353 &psu->debugfs_entries[MAX20730_DEBUGFS_OUT_V_RAMP_RATE], 354 &max20730_fops); 355 debugfs_create_file("oc_protection_mode", 0444, max20730_dir, 356 &psu->debugfs_entries[MAX20730_DEBUGFS_OC_PROTECT_MODE], 357 &max20730_fops); 358 debugfs_create_file("soft_start_timing", 0444, max20730_dir, 359 &psu->debugfs_entries[MAX20730_DEBUGFS_SS_TIMING], 360 &max20730_fops); 361 debugfs_create_file("imax", 0444, max20730_dir, 362 &psu->debugfs_entries[MAX20730_DEBUGFS_IMAX], 363 &max20730_fops); 364 debugfs_create_file("operation", 0444, max20730_dir, 365 &psu->debugfs_entries[MAX20730_DEBUGFS_OPERATION], 366 &max20730_fops); 367 debugfs_create_file("on_off_config", 0444, max20730_dir, 368 &psu->debugfs_entries[MAX20730_DEBUGFS_ON_OFF_CONFIG], 369 &max20730_fops); 370 debugfs_create_file("smbalert_mask", 0444, max20730_dir, 371 &psu->debugfs_entries[MAX20730_DEBUGFS_SMBALERT_MASK], 372 &max20730_fops); 373 debugfs_create_file("vout_mode", 0444, max20730_dir, 374 &psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_MODE], 375 &max20730_fops); 376 debugfs_create_file("vout_command", 0444, max20730_dir, 377 &psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_COMMAND], 378 &max20730_fops); 379 debugfs_create_file("vout_max", 0444, max20730_dir, 380 &psu->debugfs_entries[MAX20730_DEBUGFS_VOUT_MAX], 381 &max20730_fops); 382 383 return 0; 384} 385#else 386static int max20730_init_debugfs(struct i2c_client *client, 387 struct max20730_data *data) 388{ 389 return 0; 390} 391#endif /* CONFIG_DEBUG_FS */ 392 393static const struct i2c_device_id max20730_id[]; 394 395/* 396 * Convert discreet value to direct data format. Strictly speaking, all passed 397 * values are constants, so we could do that calculation manually. On the 398 * downside, that would make the driver more difficult to maintain, so lets 399 * use this approach. 400 */ 401static u16 val_to_direct(int v, enum pmbus_sensor_classes class, 402 const struct pmbus_driver_info *info) 403{ 404 int R = info->R[class] - 3; /* take milli-units into account */ 405 int b = info->b[class] * 1000; 406 long d; 407 408 d = v * info->m[class] + b; 409 /* 410 * R < 0 is true for all callers, so we don't need to bother 411 * about the R > 0 case. 412 */ 413 while (R < 0) { 414 d = DIV_ROUND_CLOSEST(d, 10); 415 R++; 416 } 417 return (u16)d; 418} 419 420static long direct_to_val(u16 w, enum pmbus_sensor_classes class, 421 const struct pmbus_driver_info *info) 422{ 423 int R = info->R[class] - 3; 424 int b = info->b[class] * 1000; 425 int m = info->m[class]; 426 long d = (s16)w; 427 428 if (m == 0) 429 return 0; 430 431 while (R < 0) { 432 d *= 10; 433 R++; 434 } 435 d = (d - b) / m; 436 return d; 437} 438 439static u32 max_current[][5] = { 440 [max20710] = { 6200, 8000, 9700, 11600 }, 441 [max20730] = { 13000, 16600, 20100, 23600 }, 442 [max20734] = { 21000, 27000, 32000, 38000 }, 443 [max20743] = { 18900, 24100, 29200, 34100 }, 444}; 445 446static int max20730_read_word_data(struct i2c_client *client, int page, 447 int phase, int reg) 448{ 449 const struct pmbus_driver_info *info = pmbus_get_driver_info(client); 450 const struct max20730_data *data = to_max20730_data(info); 451 int ret = 0; 452 u32 max_c; 453 454 switch (reg) { 455 case PMBUS_OT_FAULT_LIMIT: 456 switch ((data->mfr_devset1 >> 11) & 0x3) { 457 case 0x0: 458 ret = val_to_direct(150000, PSC_TEMPERATURE, info); 459 break; 460 case 0x1: 461 ret = val_to_direct(130000, PSC_TEMPERATURE, info); 462 break; 463 default: 464 ret = -ENODATA; 465 break; 466 } 467 break; 468 case PMBUS_IOUT_OC_FAULT_LIMIT: 469 max_c = max_current[data->id][(data->mfr_devset1 >> 5) & 0x3]; 470 ret = val_to_direct(max_c, PSC_CURRENT_OUT, info); 471 break; 472 case PMBUS_READ_VOUT: 473 ret = pmbus_read_word_data(client, page, phase, reg); 474 if (ret > 0 && data->vout_voltage_divider[0] && data->vout_voltage_divider[1]) { 475 u64 temp = DIV_ROUND_CLOSEST_ULL((u64)ret * data->vout_voltage_divider[1], 476 data->vout_voltage_divider[0]); 477 ret = clamp_val(temp, 0, 0xffff); 478 } 479 break; 480 default: 481 ret = -ENODATA; 482 break; 483 } 484 return ret; 485} 486 487static int max20730_write_word_data(struct i2c_client *client, int page, 488 int reg, u16 word) 489{ 490 struct pmbus_driver_info *info; 491 struct max20730_data *data; 492 u16 devset1; 493 int ret = 0; 494 int idx; 495 496 info = (struct pmbus_driver_info *)pmbus_get_driver_info(client); 497 data = to_max20730_data(info); 498 499 mutex_lock(&data->lock); 500 devset1 = data->mfr_devset1; 501 502 switch (reg) { 503 case PMBUS_OT_FAULT_LIMIT: 504 devset1 &= ~(BIT(11) | BIT(12)); 505 if (direct_to_val(word, PSC_TEMPERATURE, info) < 140000) 506 devset1 |= BIT(11); 507 break; 508 case PMBUS_IOUT_OC_FAULT_LIMIT: 509 devset1 &= ~(BIT(5) | BIT(6)); 510 511 idx = find_closest(direct_to_val(word, PSC_CURRENT_OUT, info), 512 max_current[data->id], 4); 513 devset1 |= (idx << 5); 514 break; 515 default: 516 ret = -ENODATA; 517 break; 518 } 519 520 if (!ret && devset1 != data->mfr_devset1) { 521 ret = i2c_smbus_write_word_data(client, MAX20730_MFR_DEVSET1, 522 devset1); 523 if (!ret) { 524 data->mfr_devset1 = devset1; 525 pmbus_clear_cache(client); 526 } 527 } 528 mutex_unlock(&data->lock); 529 return ret; 530} 531 532static const struct pmbus_driver_info max20730_info[] = { 533 [max20710] = { 534 .pages = 1, 535 .read_word_data = max20730_read_word_data, 536 .write_word_data = max20730_write_word_data, 537 538 /* Source : Maxim AN6140 and AN6042 */ 539 .format[PSC_TEMPERATURE] = direct, 540 .m[PSC_TEMPERATURE] = 21, 541 .b[PSC_TEMPERATURE] = 5887, 542 .R[PSC_TEMPERATURE] = -1, 543 544 .format[PSC_VOLTAGE_IN] = direct, 545 .m[PSC_VOLTAGE_IN] = 3609, 546 .b[PSC_VOLTAGE_IN] = 0, 547 .R[PSC_VOLTAGE_IN] = -2, 548 549 .format[PSC_CURRENT_OUT] = direct, 550 .m[PSC_CURRENT_OUT] = 153, 551 .b[PSC_CURRENT_OUT] = 4976, 552 .R[PSC_CURRENT_OUT] = -1, 553 554 .format[PSC_VOLTAGE_OUT] = linear, 555 556 .func[0] = PMBUS_HAVE_VIN | 557 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 558 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 559 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | 560 PMBUS_HAVE_STATUS_INPUT, 561 }, 562 [max20730] = { 563 .pages = 1, 564 .read_word_data = max20730_read_word_data, 565 .write_word_data = max20730_write_word_data, 566 567 /* Source : Maxim AN6042 */ 568 .format[PSC_TEMPERATURE] = direct, 569 .m[PSC_TEMPERATURE] = 21, 570 .b[PSC_TEMPERATURE] = 5887, 571 .R[PSC_TEMPERATURE] = -1, 572 573 .format[PSC_VOLTAGE_IN] = direct, 574 .m[PSC_VOLTAGE_IN] = 3609, 575 .b[PSC_VOLTAGE_IN] = 0, 576 .R[PSC_VOLTAGE_IN] = -2, 577 578 /* 579 * Values in the datasheet are adjusted for temperature and 580 * for the relationship between Vin and Vout. 581 * Unfortunately, the data sheet suggests that Vout measurement 582 * may be scaled with a resistor array. This is indeed the case 583 * at least on the evaulation boards. As a result, any in-driver 584 * adjustments would either be wrong or require elaborate means 585 * to configure the scaling. Instead of doing that, just report 586 * raw values and let userspace handle adjustments. 587 */ 588 .format[PSC_CURRENT_OUT] = direct, 589 .m[PSC_CURRENT_OUT] = 153, 590 .b[PSC_CURRENT_OUT] = 4976, 591 .R[PSC_CURRENT_OUT] = -1, 592 593 .format[PSC_VOLTAGE_OUT] = linear, 594 595 .func[0] = PMBUS_HAVE_VIN | 596 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 597 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 598 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | 599 PMBUS_HAVE_STATUS_INPUT, 600 }, 601 [max20734] = { 602 .pages = 1, 603 .read_word_data = max20730_read_word_data, 604 .write_word_data = max20730_write_word_data, 605 606 /* Source : Maxim AN6209 */ 607 .format[PSC_TEMPERATURE] = direct, 608 .m[PSC_TEMPERATURE] = 21, 609 .b[PSC_TEMPERATURE] = 5887, 610 .R[PSC_TEMPERATURE] = -1, 611 612 .format[PSC_VOLTAGE_IN] = direct, 613 .m[PSC_VOLTAGE_IN] = 3592, 614 .b[PSC_VOLTAGE_IN] = 0, 615 .R[PSC_VOLTAGE_IN] = -2, 616 617 .format[PSC_CURRENT_OUT] = direct, 618 .m[PSC_CURRENT_OUT] = 111, 619 .b[PSC_CURRENT_OUT] = 3461, 620 .R[PSC_CURRENT_OUT] = -1, 621 622 .format[PSC_VOLTAGE_OUT] = linear, 623 624 .func[0] = PMBUS_HAVE_VIN | 625 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 626 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 627 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | 628 PMBUS_HAVE_STATUS_INPUT, 629 }, 630 [max20743] = { 631 .pages = 1, 632 .read_word_data = max20730_read_word_data, 633 .write_word_data = max20730_write_word_data, 634 635 /* Source : Maxim AN6042 */ 636 .format[PSC_TEMPERATURE] = direct, 637 .m[PSC_TEMPERATURE] = 21, 638 .b[PSC_TEMPERATURE] = 5887, 639 .R[PSC_TEMPERATURE] = -1, 640 641 .format[PSC_VOLTAGE_IN] = direct, 642 .m[PSC_VOLTAGE_IN] = 3597, 643 .b[PSC_VOLTAGE_IN] = 0, 644 .R[PSC_VOLTAGE_IN] = -2, 645 646 .format[PSC_CURRENT_OUT] = direct, 647 .m[PSC_CURRENT_OUT] = 95, 648 .b[PSC_CURRENT_OUT] = 5014, 649 .R[PSC_CURRENT_OUT] = -1, 650 651 .format[PSC_VOLTAGE_OUT] = linear, 652 653 .func[0] = PMBUS_HAVE_VIN | 654 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 655 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 656 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | 657 PMBUS_HAVE_STATUS_INPUT, 658 }, 659}; 660 661static int max20730_probe(struct i2c_client *client) 662{ 663 struct device *dev = &client->dev; 664 u8 buf[I2C_SMBUS_BLOCK_MAX + 1]; 665 struct max20730_data *data; 666 enum chips chip_id; 667 int ret; 668 669 if (!i2c_check_functionality(client->adapter, 670 I2C_FUNC_SMBUS_READ_BYTE_DATA | 671 I2C_FUNC_SMBUS_READ_WORD_DATA | 672 I2C_FUNC_SMBUS_BLOCK_DATA)) 673 return -ENODEV; 674 675 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); 676 if (ret < 0) { 677 dev_err(&client->dev, "Failed to read Manufacturer ID\n"); 678 return ret; 679 } 680 if (ret != 5 || strncmp(buf, "MAXIM", 5)) { 681 buf[ret] = '\0'; 682 dev_err(dev, "Unsupported Manufacturer ID '%s'\n", buf); 683 return -ENODEV; 684 } 685 686 /* 687 * The chips support reading PMBUS_MFR_MODEL. On both MAX20730 688 * and MAX20734, reading it returns M20743. Presumably that is 689 * the reason why the command is not documented. Unfortunately, 690 * that means that there is no reliable means to detect the chip. 691 * However, we can at least detect the chip series. Compare 692 * the returned value against 'M20743' and bail out if there is 693 * a mismatch. If that doesn't work for all chips, we may have 694 * to remove this check. 695 */ 696 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); 697 if (ret < 0) { 698 dev_err(dev, "Failed to read Manufacturer Model\n"); 699 return ret; 700 } 701 if (ret != 6 || strncmp(buf, "M20743", 6)) { 702 buf[ret] = '\0'; 703 dev_err(dev, "Unsupported Manufacturer Model '%s'\n", buf); 704 return -ENODEV; 705 } 706 707 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_REVISION, buf); 708 if (ret < 0) { 709 dev_err(dev, "Failed to read Manufacturer Revision\n"); 710 return ret; 711 } 712 if (ret != 1 || buf[0] != 'F') { 713 buf[ret] = '\0'; 714 dev_err(dev, "Unsupported Manufacturer Revision '%s'\n", buf); 715 return -ENODEV; 716 } 717 718 if (client->dev.of_node) 719 chip_id = (uintptr_t)of_device_get_match_data(dev); 720 else 721 chip_id = i2c_match_id(max20730_id, client)->driver_data; 722 723 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 724 if (!data) 725 return -ENOMEM; 726 data->id = chip_id; 727 mutex_init(&data->lock); 728 memcpy(&data->info, &max20730_info[chip_id], sizeof(data->info)); 729 if (of_property_read_u32_array(client->dev.of_node, "vout-voltage-divider", 730 data->vout_voltage_divider, 731 ARRAY_SIZE(data->vout_voltage_divider)) != 0) 732 memset(data->vout_voltage_divider, 0, sizeof(data->vout_voltage_divider)); 733 if (data->vout_voltage_divider[1] < data->vout_voltage_divider[0]) { 734 dev_err(dev, 735 "The total resistance of voltage divider is less than output resistance\n"); 736 return -EINVAL; 737 } 738 739 ret = i2c_smbus_read_word_data(client, MAX20730_MFR_DEVSET1); 740 if (ret < 0) 741 return ret; 742 data->mfr_devset1 = ret; 743 744 ret = pmbus_do_probe(client, &data->info); 745 if (ret < 0) 746 return ret; 747 748 ret = max20730_init_debugfs(client, data); 749 if (ret) 750 dev_warn(dev, "Failed to register debugfs: %d\n", 751 ret); 752 753 return 0; 754} 755 756static const struct i2c_device_id max20730_id[] = { 757 { "max20710", max20710 }, 758 { "max20730", max20730 }, 759 { "max20734", max20734 }, 760 { "max20743", max20743 }, 761 { }, 762}; 763 764MODULE_DEVICE_TABLE(i2c, max20730_id); 765 766static const struct of_device_id max20730_of_match[] = { 767 { .compatible = "maxim,max20710", .data = (void *)max20710 }, 768 { .compatible = "maxim,max20730", .data = (void *)max20730 }, 769 { .compatible = "maxim,max20734", .data = (void *)max20734 }, 770 { .compatible = "maxim,max20743", .data = (void *)max20743 }, 771 { }, 772}; 773 774MODULE_DEVICE_TABLE(of, max20730_of_match); 775 776static struct i2c_driver max20730_driver = { 777 .driver = { 778 .name = "max20730", 779 .of_match_table = max20730_of_match, 780 }, 781 .probe = max20730_probe, 782 .id_table = max20730_id, 783}; 784 785module_i2c_driver(max20730_driver); 786 787MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); 788MODULE_DESCRIPTION("PMBus driver for Maxim MAX20710 / MAX20730 / MAX20734 / MAX20743"); 789MODULE_LICENSE("GPL"); 790MODULE_IMPORT_NS(PMBUS); 791