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