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