1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Fuel gauge driver for Maxim 17201/17205 4 * 5 * based on max1721x_battery.c 6 * 7 * Copyright (C) 2024 Liebherr-Electronics and Drives GmbH 8 */ 9 10 #include <linux/bitfield.h> 11 #include <linux/i2c.h> 12 #include <linux/module.h> 13 #include <linux/nvmem-provider.h> 14 #include <linux/power_supply.h> 15 #include <linux/regmap.h> 16 17 #include <linux/unaligned.h> 18 19 /* SBS compliant registers */ 20 #define MAX172XX_TEMP1 0x34 21 #define MAX172XX_INT_TEMP 0x35 22 #define MAX172XX_TEMP2 0x3B 23 24 /* Nonvolatile registers */ 25 #define MAX1720X_NXTABLE0 0x80 26 #define MAX1720X_NRSENSE 0xCF /* RSense in 10^-5 Ohm */ 27 #define MAX1720X_NDEVICE_NAME4 0xDF 28 29 /* ModelGauge m5 */ 30 #define MAX172XX_STATUS 0x00 /* Status */ 31 #define MAX172XX_STATUS_BAT_ABSENT BIT(3) /* Battery absent */ 32 #define MAX172XX_REPCAP 0x05 /* Average capacity */ 33 #define MAX172XX_REPSOC 0x06 /* Percentage of charge */ 34 #define MAX172XX_TEMP 0x08 /* Temperature */ 35 #define MAX172XX_CURRENT 0x0A /* Actual current */ 36 #define MAX172XX_AVG_CURRENT 0x0B /* Average current */ 37 #define MAX172XX_FULL_CAP 0x10 /* Calculated full capacity */ 38 #define MAX172XX_TTE 0x11 /* Time to empty */ 39 #define MAX172XX_AVG_TA 0x16 /* Average temperature */ 40 #define MAX172XX_CYCLES 0x17 41 #define MAX172XX_DESIGN_CAP 0x18 /* Design capacity */ 42 #define MAX172XX_AVG_VCELL 0x19 43 #define MAX172XX_TTF 0x20 /* Time to full */ 44 #define MAX172XX_DEV_NAME 0x21 /* Device name */ 45 #define MAX172XX_DEV_NAME_TYPE_MASK GENMASK(3, 0) 46 #define MAX172XX_DEV_NAME_TYPE_MAX17201 BIT(0) 47 #define MAX172XX_DEV_NAME_TYPE_MAX17205 (BIT(0) | BIT(2)) 48 #define MAX172XX_QR_TABLE10 0x22 49 #define MAX172XX_BATT 0xDA /* Battery voltage */ 50 #define MAX172XX_ATAVCAP 0xDF 51 52 static const char *const max1720x_manufacturer = "Maxim Integrated"; 53 static const char *const max17201_model = "MAX17201"; 54 static const char *const max17205_model = "MAX17205"; 55 56 struct max1720x_device_info { 57 struct regmap *regmap; 58 struct regmap *regmap_nv; 59 struct i2c_client *ancillary; 60 int rsense; 61 }; 62 63 /* 64 * Model Gauge M5 Algorithm output register 65 * Volatile data (must not be cached) 66 */ 67 static const struct regmap_range max1720x_volatile_allow[] = { 68 regmap_reg_range(MAX172XX_STATUS, MAX172XX_CYCLES), 69 regmap_reg_range(MAX172XX_AVG_VCELL, MAX172XX_TTF), 70 regmap_reg_range(MAX172XX_QR_TABLE10, MAX172XX_ATAVCAP), 71 }; 72 73 static const struct regmap_range max1720x_readable_allow[] = { 74 regmap_reg_range(MAX172XX_STATUS, MAX172XX_ATAVCAP), 75 }; 76 77 static const struct regmap_range max1720x_readable_deny[] = { 78 /* unused registers */ 79 regmap_reg_range(0x24, 0x26), 80 regmap_reg_range(0x30, 0x31), 81 regmap_reg_range(0x33, 0x34), 82 regmap_reg_range(0x37, 0x37), 83 regmap_reg_range(0x3B, 0x3C), 84 regmap_reg_range(0x40, 0x41), 85 regmap_reg_range(0x43, 0x44), 86 regmap_reg_range(0x47, 0x49), 87 regmap_reg_range(0x4B, 0x4C), 88 regmap_reg_range(0x4E, 0xAF), 89 regmap_reg_range(0xB1, 0xB3), 90 regmap_reg_range(0xB5, 0xB7), 91 regmap_reg_range(0xBF, 0xD0), 92 regmap_reg_range(0xDB, 0xDB), 93 regmap_reg_range(0xE0, 0xFF), 94 }; 95 96 static const struct regmap_access_table max1720x_readable_regs = { 97 .yes_ranges = max1720x_readable_allow, 98 .n_yes_ranges = ARRAY_SIZE(max1720x_readable_allow), 99 .no_ranges = max1720x_readable_deny, 100 .n_no_ranges = ARRAY_SIZE(max1720x_readable_deny), 101 }; 102 103 static const struct regmap_access_table max1720x_volatile_regs = { 104 .yes_ranges = max1720x_volatile_allow, 105 .n_yes_ranges = ARRAY_SIZE(max1720x_volatile_allow), 106 .no_ranges = max1720x_readable_deny, 107 .n_no_ranges = ARRAY_SIZE(max1720x_readable_deny), 108 }; 109 110 static const struct regmap_config max1720x_regmap_cfg = { 111 .reg_bits = 8, 112 .val_bits = 16, 113 .max_register = MAX172XX_ATAVCAP, 114 .val_format_endian = REGMAP_ENDIAN_LITTLE, 115 .rd_table = &max1720x_readable_regs, 116 .volatile_table = &max1720x_volatile_regs, 117 .cache_type = REGCACHE_RBTREE, 118 }; 119 120 static const struct regmap_range max1720x_nvmem_allow[] = { 121 regmap_reg_range(MAX172XX_TEMP1, MAX172XX_INT_TEMP), 122 regmap_reg_range(MAX172XX_TEMP2, MAX172XX_TEMP2), 123 regmap_reg_range(MAX1720X_NXTABLE0, MAX1720X_NDEVICE_NAME4), 124 }; 125 126 static const struct regmap_range max1720x_nvmem_deny[] = { 127 regmap_reg_range(0x00, 0x33), 128 regmap_reg_range(0x36, 0x3A), 129 regmap_reg_range(0x3C, 0x7F), 130 regmap_reg_range(0xE0, 0xFF), 131 }; 132 133 static const struct regmap_access_table max1720x_nvmem_regs = { 134 .yes_ranges = max1720x_nvmem_allow, 135 .n_yes_ranges = ARRAY_SIZE(max1720x_nvmem_allow), 136 .no_ranges = max1720x_nvmem_deny, 137 .n_no_ranges = ARRAY_SIZE(max1720x_nvmem_deny), 138 }; 139 140 static const struct regmap_config max1720x_nvmem_regmap_cfg = { 141 .reg_bits = 8, 142 .val_bits = 16, 143 .max_register = MAX1720X_NDEVICE_NAME4, 144 .val_format_endian = REGMAP_ENDIAN_LITTLE, 145 .rd_table = &max1720x_nvmem_regs, 146 }; 147 148 static const struct nvmem_cell_info max1720x_nvmem_cells[] = { 149 { .name = "nXTable0", .offset = 0, .bytes = 2, }, 150 { .name = "nXTable1", .offset = 2, .bytes = 2, }, 151 { .name = "nXTable2", .offset = 4, .bytes = 2, }, 152 { .name = "nXTable3", .offset = 6, .bytes = 2, }, 153 { .name = "nXTable4", .offset = 8, .bytes = 2, }, 154 { .name = "nXTable5", .offset = 10, .bytes = 2, }, 155 { .name = "nXTable6", .offset = 12, .bytes = 2, }, 156 { .name = "nXTable7", .offset = 14, .bytes = 2, }, 157 { .name = "nXTable8", .offset = 16, .bytes = 2, }, 158 { .name = "nXTable9", .offset = 18, .bytes = 2, }, 159 { .name = "nXTable10", .offset = 20, .bytes = 2, }, 160 { .name = "nXTable11", .offset = 22, .bytes = 2, }, 161 { .name = "nUser18C", .offset = 24, .bytes = 2, }, 162 { .name = "nUser18D", .offset = 26, .bytes = 2, }, 163 { .name = "nODSCTh", .offset = 28, .bytes = 2, }, 164 { .name = "nODSCCfg", .offset = 30, .bytes = 2, }, 165 166 { .name = "nOCVTable0", .offset = 32, .bytes = 2, }, 167 { .name = "nOCVTable1", .offset = 34, .bytes = 2, }, 168 { .name = "nOCVTable2", .offset = 36, .bytes = 2, }, 169 { .name = "nOCVTable3", .offset = 38, .bytes = 2, }, 170 { .name = "nOCVTable4", .offset = 40, .bytes = 2, }, 171 { .name = "nOCVTable5", .offset = 42, .bytes = 2, }, 172 { .name = "nOCVTable6", .offset = 44, .bytes = 2, }, 173 { .name = "nOCVTable7", .offset = 46, .bytes = 2, }, 174 { .name = "nOCVTable8", .offset = 48, .bytes = 2, }, 175 { .name = "nOCVTable9", .offset = 50, .bytes = 2, }, 176 { .name = "nOCVTable10", .offset = 52, .bytes = 2, }, 177 { .name = "nOCVTable11", .offset = 54, .bytes = 2, }, 178 { .name = "nIChgTerm", .offset = 56, .bytes = 2, }, 179 { .name = "nFilterCfg", .offset = 58, .bytes = 2, }, 180 { .name = "nVEmpty", .offset = 60, .bytes = 2, }, 181 { .name = "nLearnCfg", .offset = 62, .bytes = 2, }, 182 183 { .name = "nQRTable00", .offset = 64, .bytes = 2, }, 184 { .name = "nQRTable10", .offset = 66, .bytes = 2, }, 185 { .name = "nQRTable20", .offset = 68, .bytes = 2, }, 186 { .name = "nQRTable30", .offset = 70, .bytes = 2, }, 187 { .name = "nCycles", .offset = 72, .bytes = 2, }, 188 { .name = "nFullCapNom", .offset = 74, .bytes = 2, }, 189 { .name = "nRComp0", .offset = 76, .bytes = 2, }, 190 { .name = "nTempCo", .offset = 78, .bytes = 2, }, 191 { .name = "nIAvgEmpty", .offset = 80, .bytes = 2, }, 192 { .name = "nFullCapRep", .offset = 82, .bytes = 2, }, 193 { .name = "nVoltTemp", .offset = 84, .bytes = 2, }, 194 { .name = "nMaxMinCurr", .offset = 86, .bytes = 2, }, 195 { .name = "nMaxMinVolt", .offset = 88, .bytes = 2, }, 196 { .name = "nMaxMinTemp", .offset = 90, .bytes = 2, }, 197 { .name = "nSOC", .offset = 92, .bytes = 2, }, 198 { .name = "nTimerH", .offset = 94, .bytes = 2, }, 199 200 { .name = "nConfig", .offset = 96, .bytes = 2, }, 201 { .name = "nRippleCfg", .offset = 98, .bytes = 2, }, 202 { .name = "nMiscCfg", .offset = 100, .bytes = 2, }, 203 { .name = "nDesignCap", .offset = 102, .bytes = 2, }, 204 { .name = "nHibCfg", .offset = 104, .bytes = 2, }, 205 { .name = "nPackCfg", .offset = 106, .bytes = 2, }, 206 { .name = "nRelaxCfg", .offset = 108, .bytes = 2, }, 207 { .name = "nConvgCfg", .offset = 110, .bytes = 2, }, 208 { .name = "nNVCfg0", .offset = 112, .bytes = 2, }, 209 { .name = "nNVCfg1", .offset = 114, .bytes = 2, }, 210 { .name = "nNVCfg2", .offset = 116, .bytes = 2, }, 211 { .name = "nSBSCfg", .offset = 118, .bytes = 2, }, 212 { .name = "nROMID0", .offset = 120, .bytes = 2, }, 213 { .name = "nROMID1", .offset = 122, .bytes = 2, }, 214 { .name = "nROMID2", .offset = 124, .bytes = 2, }, 215 { .name = "nROMID3", .offset = 126, .bytes = 2, }, 216 217 { .name = "nVAlrtTh", .offset = 128, .bytes = 2, }, 218 { .name = "nTAlrtTh", .offset = 130, .bytes = 2, }, 219 { .name = "nSAlrtTh", .offset = 132, .bytes = 2, }, 220 { .name = "nIAlrtTh", .offset = 134, .bytes = 2, }, 221 { .name = "nUser1C4", .offset = 136, .bytes = 2, }, 222 { .name = "nUser1C5", .offset = 138, .bytes = 2, }, 223 { .name = "nFullSOCThr", .offset = 140, .bytes = 2, }, 224 { .name = "nTTFCfg", .offset = 142, .bytes = 2, }, 225 { .name = "nCGain", .offset = 144, .bytes = 2, }, 226 { .name = "nTCurve", .offset = 146, .bytes = 2, }, 227 { .name = "nTGain", .offset = 148, .bytes = 2, }, 228 { .name = "nTOff", .offset = 150, .bytes = 2, }, 229 { .name = "nManfctrName0", .offset = 152, .bytes = 2, }, 230 { .name = "nManfctrName1", .offset = 154, .bytes = 2, }, 231 { .name = "nManfctrName2", .offset = 156, .bytes = 2, }, 232 { .name = "nRSense", .offset = 158, .bytes = 2, }, 233 234 { .name = "nUser1D0", .offset = 160, .bytes = 2, }, 235 { .name = "nUser1D1", .offset = 162, .bytes = 2, }, 236 { .name = "nAgeFcCfg", .offset = 164, .bytes = 2, }, 237 { .name = "nDesignVoltage", .offset = 166, .bytes = 2, }, 238 { .name = "nUser1D4", .offset = 168, .bytes = 2, }, 239 { .name = "nRFastVShdn", .offset = 170, .bytes = 2, }, 240 { .name = "nManfctrDate", .offset = 172, .bytes = 2, }, 241 { .name = "nFirstUsed", .offset = 174, .bytes = 2, }, 242 { .name = "nSerialNumber0", .offset = 176, .bytes = 2, }, 243 { .name = "nSerialNumber1", .offset = 178, .bytes = 2, }, 244 { .name = "nSerialNumber2", .offset = 180, .bytes = 2, }, 245 { .name = "nDeviceName0", .offset = 182, .bytes = 2, }, 246 { .name = "nDeviceName1", .offset = 184, .bytes = 2, }, 247 { .name = "nDeviceName2", .offset = 186, .bytes = 2, }, 248 { .name = "nDeviceName3", .offset = 188, .bytes = 2, }, 249 { .name = "nDeviceName4", .offset = 190, .bytes = 2, }, 250 }; 251 252 static const enum power_supply_property max1720x_battery_props[] = { 253 POWER_SUPPLY_PROP_PRESENT, 254 POWER_SUPPLY_PROP_CAPACITY, 255 POWER_SUPPLY_PROP_VOLTAGE_NOW, 256 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 257 POWER_SUPPLY_PROP_CHARGE_AVG, 258 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 259 POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 260 POWER_SUPPLY_PROP_TEMP, 261 POWER_SUPPLY_PROP_CURRENT_NOW, 262 POWER_SUPPLY_PROP_CURRENT_AVG, 263 POWER_SUPPLY_PROP_CHARGE_FULL, 264 POWER_SUPPLY_PROP_MODEL_NAME, 265 POWER_SUPPLY_PROP_MANUFACTURER, 266 }; 267 268 /* Convert regs value to power_supply units */ 269 270 static int max172xx_time_to_ps(unsigned int reg) 271 { 272 return reg * 5625 / 1000; /* in sec. */ 273 } 274 275 static int max172xx_percent_to_ps(unsigned int reg) 276 { 277 return reg / 256; /* in percent from 0 to 100 */ 278 } 279 280 static int max172xx_voltage_to_ps(unsigned int reg) 281 { 282 return reg * 1250; /* in uV */ 283 } 284 285 static int max172xx_capacity_to_ps(unsigned int reg) 286 { 287 return reg * 500; /* in uAh */ 288 } 289 290 /* 291 * Current and temperature is signed values, so unsigned regs 292 * value must be converted to signed type 293 */ 294 295 static int max172xx_temperature_to_ps(unsigned int reg) 296 { 297 int val = (int16_t)reg; 298 299 return val * 10 / 256; /* in tenths of deg. C */ 300 } 301 302 /* 303 * Calculating current registers resolution: 304 * 305 * RSense stored in 10^-5 Ohm, so mesaurment voltage must be 306 * in 10^-11 Volts for get current in uA. 307 * 16 bit current reg fullscale +/-51.2mV is 102400 uV. 308 * So: 102400 / 65535 * 10^5 = 156252 309 */ 310 static int max172xx_current_to_voltage(unsigned int reg) 311 { 312 int val = (int16_t)reg; 313 314 return val * 156252; 315 } 316 317 static int max1720x_battery_get_property(struct power_supply *psy, 318 enum power_supply_property psp, 319 union power_supply_propval *val) 320 { 321 struct max1720x_device_info *info = power_supply_get_drvdata(psy); 322 unsigned int reg_val; 323 int ret = 0; 324 325 switch (psp) { 326 case POWER_SUPPLY_PROP_PRESENT: 327 /* 328 * POWER_SUPPLY_PROP_PRESENT will always readable via 329 * sysfs interface. Value return 0 if battery not 330 * present or unaccesable via I2c. 331 */ 332 ret = regmap_read(info->regmap, MAX172XX_STATUS, ®_val); 333 if (ret < 0) { 334 val->intval = 0; 335 return 0; 336 } 337 338 val->intval = !FIELD_GET(MAX172XX_STATUS_BAT_ABSENT, reg_val); 339 break; 340 case POWER_SUPPLY_PROP_CAPACITY: 341 ret = regmap_read(info->regmap, MAX172XX_REPSOC, ®_val); 342 val->intval = max172xx_percent_to_ps(reg_val); 343 break; 344 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 345 ret = regmap_read(info->regmap, MAX172XX_BATT, ®_val); 346 val->intval = max172xx_voltage_to_ps(reg_val); 347 break; 348 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 349 ret = regmap_read(info->regmap, MAX172XX_DESIGN_CAP, ®_val); 350 val->intval = max172xx_capacity_to_ps(reg_val); 351 break; 352 case POWER_SUPPLY_PROP_CHARGE_AVG: 353 ret = regmap_read(info->regmap, MAX172XX_REPCAP, ®_val); 354 val->intval = max172xx_capacity_to_ps(reg_val); 355 break; 356 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: 357 ret = regmap_read(info->regmap, MAX172XX_TTE, ®_val); 358 val->intval = max172xx_time_to_ps(reg_val); 359 break; 360 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG: 361 ret = regmap_read(info->regmap, MAX172XX_TTF, ®_val); 362 val->intval = max172xx_time_to_ps(reg_val); 363 break; 364 case POWER_SUPPLY_PROP_TEMP: 365 ret = regmap_read(info->regmap, MAX172XX_TEMP, ®_val); 366 val->intval = max172xx_temperature_to_ps(reg_val); 367 break; 368 case POWER_SUPPLY_PROP_CURRENT_NOW: 369 ret = regmap_read(info->regmap, MAX172XX_CURRENT, ®_val); 370 val->intval = max172xx_current_to_voltage(reg_val) / info->rsense; 371 break; 372 case POWER_SUPPLY_PROP_CURRENT_AVG: 373 ret = regmap_read(info->regmap, MAX172XX_AVG_CURRENT, ®_val); 374 val->intval = max172xx_current_to_voltage(reg_val) / info->rsense; 375 break; 376 case POWER_SUPPLY_PROP_CHARGE_FULL: 377 ret = regmap_read(info->regmap, MAX172XX_FULL_CAP, ®_val); 378 val->intval = max172xx_capacity_to_ps(reg_val); 379 break; 380 case POWER_SUPPLY_PROP_MODEL_NAME: 381 ret = regmap_read(info->regmap, MAX172XX_DEV_NAME, ®_val); 382 reg_val = FIELD_GET(MAX172XX_DEV_NAME_TYPE_MASK, reg_val); 383 if (reg_val == MAX172XX_DEV_NAME_TYPE_MAX17201) 384 val->strval = max17201_model; 385 else if (reg_val == MAX172XX_DEV_NAME_TYPE_MAX17205) 386 val->strval = max17205_model; 387 else 388 return -ENODEV; 389 break; 390 case POWER_SUPPLY_PROP_MANUFACTURER: 391 val->strval = max1720x_manufacturer; 392 break; 393 default: 394 return -EINVAL; 395 } 396 397 return ret; 398 } 399 400 static int max1720x_read_temp(struct device *dev, u8 reg, char *buf) 401 { 402 struct power_supply *psy = dev_get_drvdata(dev); 403 struct max1720x_device_info *info = power_supply_get_drvdata(psy); 404 unsigned int val; 405 int ret; 406 407 ret = regmap_read(info->regmap_nv, reg, &val); 408 if (ret < 0) 409 return ret; 410 411 /* 412 * Temperature in degrees Celsius starting at absolute zero, -273C or 413 * 0K with an LSb of 0.1C 414 */ 415 return sysfs_emit(buf, "%d\n", val - 2730); 416 } 417 418 static ssize_t temp_ain1_show(struct device *dev, struct device_attribute *attr, 419 char *buf) 420 { 421 return max1720x_read_temp(dev, MAX172XX_TEMP1, buf); 422 } 423 424 static ssize_t temp_ain2_show(struct device *dev, struct device_attribute *attr, 425 char *buf) 426 { 427 return max1720x_read_temp(dev, MAX172XX_TEMP2, buf); 428 } 429 430 static ssize_t temp_int_show(struct device *dev, struct device_attribute *attr, 431 char *buf) 432 { 433 return max1720x_read_temp(dev, MAX172XX_INT_TEMP, buf); 434 } 435 436 static DEVICE_ATTR_RO(temp_ain1); 437 static DEVICE_ATTR_RO(temp_ain2); 438 static DEVICE_ATTR_RO(temp_int); 439 440 static struct attribute *max1720x_attrs[] = { 441 &dev_attr_temp_ain1.attr, 442 &dev_attr_temp_ain2.attr, 443 &dev_attr_temp_int.attr, 444 NULL 445 }; 446 ATTRIBUTE_GROUPS(max1720x); 447 448 static 449 int max1720x_nvmem_reg_read(void *priv, unsigned int off, void *val, size_t len) 450 { 451 struct max1720x_device_info *info = priv; 452 unsigned int reg = MAX1720X_NXTABLE0 + (off / 2); 453 454 return regmap_bulk_read(info->regmap_nv, reg, val, len / 2); 455 } 456 457 static void max1720x_unregister_ancillary(void *data) 458 { 459 struct max1720x_device_info *info = data; 460 461 i2c_unregister_device(info->ancillary); 462 } 463 464 static int max1720x_probe_nvmem(struct i2c_client *client, 465 struct max1720x_device_info *info) 466 { 467 struct device *dev = &client->dev; 468 struct nvmem_config nvmem_config = { 469 .dev = dev, 470 .name = "max1720x_nvmem", 471 .cells = max1720x_nvmem_cells, 472 .ncells = ARRAY_SIZE(max1720x_nvmem_cells), 473 .read_only = true, 474 .root_only = true, 475 .reg_read = max1720x_nvmem_reg_read, 476 .size = ARRAY_SIZE(max1720x_nvmem_cells) * 2, 477 .word_size = 2, 478 .stride = 2, 479 .priv = info, 480 }; 481 struct nvmem_device *nvmem; 482 unsigned int val; 483 int ret; 484 485 info->ancillary = i2c_new_ancillary_device(client, "nvmem", 0xb); 486 if (IS_ERR(info->ancillary)) { 487 dev_err(dev, "Failed to initialize ancillary i2c device\n"); 488 return PTR_ERR(info->ancillary); 489 } 490 491 ret = devm_add_action_or_reset(dev, max1720x_unregister_ancillary, info); 492 if (ret) { 493 dev_err(dev, "Failed to add unregister callback\n"); 494 return ret; 495 } 496 497 info->regmap_nv = devm_regmap_init_i2c(info->ancillary, 498 &max1720x_nvmem_regmap_cfg); 499 if (IS_ERR(info->regmap_nv)) { 500 dev_err(dev, "regmap initialization of nvmem failed\n"); 501 return PTR_ERR(info->regmap_nv); 502 } 503 504 ret = regmap_read(info->regmap_nv, MAX1720X_NRSENSE, &val); 505 if (ret < 0) { 506 dev_err(dev, "Failed to read sense resistor value\n"); 507 return ret; 508 } 509 510 info->rsense = val; 511 if (!info->rsense) { 512 dev_warn(dev, "RSense not calibrated, set 10 mOhms!\n"); 513 info->rsense = 1000; /* in regs in 10^-5 */ 514 } 515 516 nvmem = devm_nvmem_register(dev, &nvmem_config); 517 if (IS_ERR(nvmem)) { 518 dev_err(dev, "Could not register nvmem!"); 519 return PTR_ERR(nvmem); 520 } 521 522 return 0; 523 } 524 525 static const struct power_supply_desc max1720x_bat_desc = { 526 .name = "max1720x", 527 .no_thermal = true, 528 .type = POWER_SUPPLY_TYPE_BATTERY, 529 .properties = max1720x_battery_props, 530 .num_properties = ARRAY_SIZE(max1720x_battery_props), 531 .get_property = max1720x_battery_get_property, 532 }; 533 534 static int max1720x_probe(struct i2c_client *client) 535 { 536 struct power_supply_config psy_cfg = {}; 537 struct device *dev = &client->dev; 538 struct max1720x_device_info *info; 539 struct power_supply *bat; 540 int ret; 541 542 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); 543 if (!info) 544 return -ENOMEM; 545 546 psy_cfg.drv_data = info; 547 psy_cfg.fwnode = dev_fwnode(dev); 548 psy_cfg.attr_grp = max1720x_groups; 549 i2c_set_clientdata(client, info); 550 info->regmap = devm_regmap_init_i2c(client, &max1720x_regmap_cfg); 551 if (IS_ERR(info->regmap)) 552 return dev_err_probe(dev, PTR_ERR(info->regmap), 553 "regmap initialization failed\n"); 554 555 ret = max1720x_probe_nvmem(client, info); 556 if (ret) 557 return dev_err_probe(dev, ret, "Failed to probe nvmem\n"); 558 559 bat = devm_power_supply_register(dev, &max1720x_bat_desc, &psy_cfg); 560 if (IS_ERR(bat)) 561 return dev_err_probe(dev, PTR_ERR(bat), 562 "Failed to register power supply\n"); 563 564 return 0; 565 } 566 567 static const struct of_device_id max1720x_of_match[] = { 568 { .compatible = "maxim,max17201" }, 569 {} 570 }; 571 MODULE_DEVICE_TABLE(of, max1720x_of_match); 572 573 static struct i2c_driver max1720x_i2c_driver = { 574 .driver = { 575 .name = "max1720x", 576 .of_match_table = max1720x_of_match, 577 }, 578 .probe = max1720x_probe, 579 }; 580 module_i2c_driver(max1720x_i2c_driver); 581 582 MODULE_LICENSE("GPL"); 583 MODULE_AUTHOR("Dimitri Fedrau <dima.fedrau@gmail.com>"); 584 MODULE_DESCRIPTION("Maxim MAX17201/MAX17205 Fuel Gauge IC driver"); 585