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max1720x_battery.c
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linux-6.19.14/drivers/power/supply/max1720x_battery.c
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_STATUS_IMX BIT(6) /* Maximum Current Alert Threshold Exceeded */ 33#define MAX172XX_STATUS_VMN BIT(8) /* Minimum Voltage Alert Threshold Exceeded */ 34#define MAX172XX_STATUS_TMN BIT(9) /* Minimum Temperature Alert Threshold Exceeded */ 35#define MAX172XX_STATUS_VMX BIT(12) /* Maximum Voltage Alert Threshold Exceeded */ 36#define MAX172XX_STATUS_TMX BIT(13) /* Maximum Temperature Alert Threshold Exceeded */ 37#define MAX172XX_REPCAP 0x05 /* Average capacity */ 38#define MAX172XX_REPSOC 0x06 /* Percentage of charge */ 39#define MAX172XX_TEMP 0x08 /* Temperature */ 40#define MAX172XX_CURRENT 0x0A /* Actual current */ 41#define MAX172XX_AVG_CURRENT 0x0B /* Average current */ 42#define MAX172XX_FULL_CAP 0x10 /* Calculated full capacity */ 43#define MAX172XX_TTE 0x11 /* Time to empty */ 44#define MAX172XX_AVG_TA 0x16 /* Average temperature */ 45#define MAX172XX_CYCLES 0x17 46#define MAX172XX_DESIGN_CAP 0x18 /* Design capacity */ 47#define MAX172XX_AVG_VCELL 0x19 48#define MAX172XX_TTF 0x20 /* Time to full */ 49#define MAX172XX_DEV_NAME 0x21 /* Device name */ 50#define MAX172XX_DEV_NAME_TYPE_MASK GENMASK(3, 0) 51#define MAX172XX_DEV_NAME_TYPE_MAX17201 BIT(0) 52#define MAX172XX_DEV_NAME_TYPE_MAX17205 (BIT(0) | BIT(2)) 53#define MAX172XX_QR_TABLE10 0x22 54#define MAX172XX_BATT 0xDA /* Battery voltage */ 55#define MAX172XX_ATAVCAP 0xDF 56 57static const char *const max1720x_manufacturer = "Maxim Integrated"; 58static const char *const max17201_model = "MAX17201"; 59static const char *const max17205_model = "MAX17205"; 60 61struct max1720x_device_info { 62 struct regmap *regmap; 63 struct regmap *regmap_nv; 64 struct i2c_client *ancillary; 65 int rsense; 66}; 67 68/* 69 * Model Gauge M5 Algorithm output register 70 * Volatile data (must not be cached) 71 */ 72static const struct regmap_range max1720x_volatile_allow[] = { 73 regmap_reg_range(MAX172XX_STATUS, MAX172XX_CYCLES), 74 regmap_reg_range(MAX172XX_AVG_VCELL, MAX172XX_TTF), 75 regmap_reg_range(MAX172XX_QR_TABLE10, MAX172XX_ATAVCAP), 76}; 77 78static const struct regmap_range max1720x_readable_allow[] = { 79 regmap_reg_range(MAX172XX_STATUS, MAX172XX_ATAVCAP), 80}; 81 82static const struct regmap_range max1720x_readable_deny[] = { 83 /* unused registers */ 84 regmap_reg_range(0x24, 0x26), 85 regmap_reg_range(0x30, 0x31), 86 regmap_reg_range(0x33, 0x34), 87 regmap_reg_range(0x37, 0x37), 88 regmap_reg_range(0x3B, 0x3C), 89 regmap_reg_range(0x40, 0x41), 90 regmap_reg_range(0x43, 0x44), 91 regmap_reg_range(0x47, 0x49), 92 regmap_reg_range(0x4B, 0x4C), 93 regmap_reg_range(0x4E, 0xAF), 94 regmap_reg_range(0xB1, 0xB3), 95 regmap_reg_range(0xB5, 0xB7), 96 regmap_reg_range(0xBF, 0xD0), 97 regmap_reg_range(0xDB, 0xDB), 98 regmap_reg_range(0xE0, 0xFF), 99}; 100 101static const struct regmap_access_table max1720x_readable_regs = { 102 .yes_ranges = max1720x_readable_allow, 103 .n_yes_ranges = ARRAY_SIZE(max1720x_readable_allow), 104 .no_ranges = max1720x_readable_deny, 105 .n_no_ranges = ARRAY_SIZE(max1720x_readable_deny), 106}; 107 108static const struct regmap_access_table max1720x_volatile_regs = { 109 .yes_ranges = max1720x_volatile_allow, 110 .n_yes_ranges = ARRAY_SIZE(max1720x_volatile_allow), 111 .no_ranges = max1720x_readable_deny, 112 .n_no_ranges = ARRAY_SIZE(max1720x_readable_deny), 113}; 114 115static const struct regmap_config max1720x_regmap_cfg = { 116 .reg_bits = 8, 117 .val_bits = 16, 118 .max_register = MAX172XX_ATAVCAP, 119 .val_format_endian = REGMAP_ENDIAN_LITTLE, 120 .rd_table = &max1720x_readable_regs, 121 .volatile_table = &max1720x_volatile_regs, 122 .cache_type = REGCACHE_MAPLE, 123}; 124 125static const struct regmap_range max1720x_nvmem_allow[] = { 126 regmap_reg_range(MAX172XX_TEMP1, MAX172XX_INT_TEMP), 127 regmap_reg_range(MAX172XX_TEMP2, MAX172XX_TEMP2), 128 regmap_reg_range(MAX1720X_NXTABLE0, MAX1720X_NDEVICE_NAME4), 129}; 130 131static const struct regmap_range max1720x_nvmem_deny[] = { 132 regmap_reg_range(0x00, 0x33), 133 regmap_reg_range(0x36, 0x3A), 134 regmap_reg_range(0x3C, 0x7F), 135 regmap_reg_range(0xE0, 0xFF), 136}; 137 138static const struct regmap_access_table max1720x_nvmem_regs = { 139 .yes_ranges = max1720x_nvmem_allow, 140 .n_yes_ranges = ARRAY_SIZE(max1720x_nvmem_allow), 141 .no_ranges = max1720x_nvmem_deny, 142 .n_no_ranges = ARRAY_SIZE(max1720x_nvmem_deny), 143}; 144 145static const struct regmap_config max1720x_nvmem_regmap_cfg = { 146 .reg_bits = 8, 147 .val_bits = 16, 148 .max_register = MAX1720X_NDEVICE_NAME4, 149 .val_format_endian = REGMAP_ENDIAN_LITTLE, 150 .rd_table = &max1720x_nvmem_regs, 151}; 152 153static const struct nvmem_cell_info max1720x_nvmem_cells[] = { 154 { .name = "nXTable0", .offset = 0, .bytes = 2, }, 155 { .name = "nXTable1", .offset = 2, .bytes = 2, }, 156 { .name = "nXTable2", .offset = 4, .bytes = 2, }, 157 { .name = "nXTable3", .offset = 6, .bytes = 2, }, 158 { .name = "nXTable4", .offset = 8, .bytes = 2, }, 159 { .name = "nXTable5", .offset = 10, .bytes = 2, }, 160 { .name = "nXTable6", .offset = 12, .bytes = 2, }, 161 { .name = "nXTable7", .offset = 14, .bytes = 2, }, 162 { .name = "nXTable8", .offset = 16, .bytes = 2, }, 163 { .name = "nXTable9", .offset = 18, .bytes = 2, }, 164 { .name = "nXTable10", .offset = 20, .bytes = 2, }, 165 { .name = "nXTable11", .offset = 22, .bytes = 2, }, 166 { .name = "nUser18C", .offset = 24, .bytes = 2, }, 167 { .name = "nUser18D", .offset = 26, .bytes = 2, }, 168 { .name = "nODSCTh", .offset = 28, .bytes = 2, }, 169 { .name = "nODSCCfg", .offset = 30, .bytes = 2, }, 170 171 { .name = "nOCVTable0", .offset = 32, .bytes = 2, }, 172 { .name = "nOCVTable1", .offset = 34, .bytes = 2, }, 173 { .name = "nOCVTable2", .offset = 36, .bytes = 2, }, 174 { .name = "nOCVTable3", .offset = 38, .bytes = 2, }, 175 { .name = "nOCVTable4", .offset = 40, .bytes = 2, }, 176 { .name = "nOCVTable5", .offset = 42, .bytes = 2, }, 177 { .name = "nOCVTable6", .offset = 44, .bytes = 2, }, 178 { .name = "nOCVTable7", .offset = 46, .bytes = 2, }, 179 { .name = "nOCVTable8", .offset = 48, .bytes = 2, }, 180 { .name = "nOCVTable9", .offset = 50, .bytes = 2, }, 181 { .name = "nOCVTable10", .offset = 52, .bytes = 2, }, 182 { .name = "nOCVTable11", .offset = 54, .bytes = 2, }, 183 { .name = "nIChgTerm", .offset = 56, .bytes = 2, }, 184 { .name = "nFilterCfg", .offset = 58, .bytes = 2, }, 185 { .name = "nVEmpty", .offset = 60, .bytes = 2, }, 186 { .name = "nLearnCfg", .offset = 62, .bytes = 2, }, 187 188 { .name = "nQRTable00", .offset = 64, .bytes = 2, }, 189 { .name = "nQRTable10", .offset = 66, .bytes = 2, }, 190 { .name = "nQRTable20", .offset = 68, .bytes = 2, }, 191 { .name = "nQRTable30", .offset = 70, .bytes = 2, }, 192 { .name = "nCycles", .offset = 72, .bytes = 2, }, 193 { .name = "nFullCapNom", .offset = 74, .bytes = 2, }, 194 { .name = "nRComp0", .offset = 76, .bytes = 2, }, 195 { .name = "nTempCo", .offset = 78, .bytes = 2, }, 196 { .name = "nIAvgEmpty", .offset = 80, .bytes = 2, }, 197 { .name = "nFullCapRep", .offset = 82, .bytes = 2, }, 198 { .name = "nVoltTemp", .offset = 84, .bytes = 2, }, 199 { .name = "nMaxMinCurr", .offset = 86, .bytes = 2, }, 200 { .name = "nMaxMinVolt", .offset = 88, .bytes = 2, }, 201 { .name = "nMaxMinTemp", .offset = 90, .bytes = 2, }, 202 { .name = "nSOC", .offset = 92, .bytes = 2, }, 203 { .name = "nTimerH", .offset = 94, .bytes = 2, }, 204 205 { .name = "nConfig", .offset = 96, .bytes = 2, }, 206 { .name = "nRippleCfg", .offset = 98, .bytes = 2, }, 207 { .name = "nMiscCfg", .offset = 100, .bytes = 2, }, 208 { .name = "nDesignCap", .offset = 102, .bytes = 2, }, 209 { .name = "nHibCfg", .offset = 104, .bytes = 2, }, 210 { .name = "nPackCfg", .offset = 106, .bytes = 2, }, 211 { .name = "nRelaxCfg", .offset = 108, .bytes = 2, }, 212 { .name = "nConvgCfg", .offset = 110, .bytes = 2, }, 213 { .name = "nNVCfg0", .offset = 112, .bytes = 2, }, 214 { .name = "nNVCfg1", .offset = 114, .bytes = 2, }, 215 { .name = "nNVCfg2", .offset = 116, .bytes = 2, }, 216 { .name = "nSBSCfg", .offset = 118, .bytes = 2, }, 217 { .name = "nROMID0", .offset = 120, .bytes = 2, }, 218 { .name = "nROMID1", .offset = 122, .bytes = 2, }, 219 { .name = "nROMID2", .offset = 124, .bytes = 2, }, 220 { .name = "nROMID3", .offset = 126, .bytes = 2, }, 221 222 { .name = "nVAlrtTh", .offset = 128, .bytes = 2, }, 223 { .name = "nTAlrtTh", .offset = 130, .bytes = 2, }, 224 { .name = "nSAlrtTh", .offset = 132, .bytes = 2, }, 225 { .name = "nIAlrtTh", .offset = 134, .bytes = 2, }, 226 { .name = "nUser1C4", .offset = 136, .bytes = 2, }, 227 { .name = "nUser1C5", .offset = 138, .bytes = 2, }, 228 { .name = "nFullSOCThr", .offset = 140, .bytes = 2, }, 229 { .name = "nTTFCfg", .offset = 142, .bytes = 2, }, 230 { .name = "nCGain", .offset = 144, .bytes = 2, }, 231 { .name = "nTCurve", .offset = 146, .bytes = 2, }, 232 { .name = "nTGain", .offset = 148, .bytes = 2, }, 233 { .name = "nTOff", .offset = 150, .bytes = 2, }, 234 { .name = "nManfctrName0", .offset = 152, .bytes = 2, }, 235 { .name = "nManfctrName1", .offset = 154, .bytes = 2, }, 236 { .name = "nManfctrName2", .offset = 156, .bytes = 2, }, 237 { .name = "nRSense", .offset = 158, .bytes = 2, }, 238 239 { .name = "nUser1D0", .offset = 160, .bytes = 2, }, 240 { .name = "nUser1D1", .offset = 162, .bytes = 2, }, 241 { .name = "nAgeFcCfg", .offset = 164, .bytes = 2, }, 242 { .name = "nDesignVoltage", .offset = 166, .bytes = 2, }, 243 { .name = "nUser1D4", .offset = 168, .bytes = 2, }, 244 { .name = "nRFastVShdn", .offset = 170, .bytes = 2, }, 245 { .name = "nManfctrDate", .offset = 172, .bytes = 2, }, 246 { .name = "nFirstUsed", .offset = 174, .bytes = 2, }, 247 { .name = "nSerialNumber0", .offset = 176, .bytes = 2, }, 248 { .name = "nSerialNumber1", .offset = 178, .bytes = 2, }, 249 { .name = "nSerialNumber2", .offset = 180, .bytes = 2, }, 250 { .name = "nDeviceName0", .offset = 182, .bytes = 2, }, 251 { .name = "nDeviceName1", .offset = 184, .bytes = 2, }, 252 { .name = "nDeviceName2", .offset = 186, .bytes = 2, }, 253 { .name = "nDeviceName3", .offset = 188, .bytes = 2, }, 254 { .name = "nDeviceName4", .offset = 190, .bytes = 2, }, 255}; 256 257static const enum power_supply_property max1720x_battery_props[] = { 258 POWER_SUPPLY_PROP_HEALTH, 259 POWER_SUPPLY_PROP_PRESENT, 260 POWER_SUPPLY_PROP_CAPACITY, 261 POWER_SUPPLY_PROP_VOLTAGE_NOW, 262 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 263 POWER_SUPPLY_PROP_CHARGE_AVG, 264 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 265 POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 266 POWER_SUPPLY_PROP_TEMP, 267 POWER_SUPPLY_PROP_CURRENT_NOW, 268 POWER_SUPPLY_PROP_CURRENT_AVG, 269 POWER_SUPPLY_PROP_CHARGE_FULL, 270 POWER_SUPPLY_PROP_MODEL_NAME, 271 POWER_SUPPLY_PROP_MANUFACTURER, 272}; 273 274/* Convert regs value to power_supply units */ 275 276static int max172xx_time_to_ps(unsigned int reg) 277{ 278 return reg * 5625 / 1000; /* in sec. */ 279} 280 281static int max172xx_percent_to_ps(unsigned int reg) 282{ 283 return reg / 256; /* in percent from 0 to 100 */ 284} 285 286static int max172xx_voltage_to_ps(unsigned int reg) 287{ 288 return reg * 1250; /* in uV */ 289} 290 291static int max172xx_capacity_to_ps(unsigned int reg, 292 struct max1720x_device_info *info) 293{ 294 return reg * (500000 / info->rsense); /* in uAh */ 295} 296 297/* 298 * Current and temperature is signed values, so unsigned regs 299 * value must be converted to signed type 300 */ 301 302static int max172xx_temperature_to_ps(unsigned int reg) 303{ 304 int val = (int16_t)reg; 305 306 return val * 10 / 256; /* in tenths of deg. C */ 307} 308 309/* 310 * Calculating current registers resolution: 311 * 312 * RSense stored in 10^-5 Ohm, so measurement voltage must be 313 * in 10^-11 Volts for get current in uA. 314 * 16 bit current reg fullscale +/-51.2mV is 102400 uV. 315 * So: 102400 / 65535 * 10^5 = 156252 316 */ 317static int max172xx_current_to_voltage(unsigned int reg) 318{ 319 int val = (int16_t)reg; 320 321 return val * 156252; 322} 323 324static int max172xx_battery_health(struct max1720x_device_info *info, 325 unsigned int *health) 326{ 327 unsigned int status; 328 int ret; 329 330 ret = regmap_read(info->regmap, MAX172XX_STATUS, &status); 331 if (ret < 0) 332 return ret; 333 334 if (status & MAX172XX_STATUS_VMN) 335 *health = POWER_SUPPLY_HEALTH_DEAD; 336 else if (status & MAX172XX_STATUS_VMX) 337 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 338 else if (status & MAX172XX_STATUS_TMN) 339 *health = POWER_SUPPLY_HEALTH_COLD; 340 else if (status & MAX172XX_STATUS_TMX) 341 *health = POWER_SUPPLY_HEALTH_OVERHEAT; 342 else if (status & MAX172XX_STATUS_IMX) 343 *health = POWER_SUPPLY_HEALTH_OVERCURRENT; 344 else 345 *health = POWER_SUPPLY_HEALTH_GOOD; 346 347 /* Clear events which are not self-clearing to detect next events */ 348 if (status > 0 && status != MAX172XX_STATUS_IMX) { 349 ret = regmap_set_bits(info->regmap, MAX172XX_STATUS, 350 MAX172XX_STATUS_VMN | 351 MAX172XX_STATUS_VMX | 352 MAX172XX_STATUS_TMN | 353 MAX172XX_STATUS_TMX); 354 if (ret < 0) 355 return ret; 356 } 357 358 return 0; 359} 360 361static int max1720x_battery_get_property(struct power_supply *psy, 362 enum power_supply_property psp, 363 union power_supply_propval *val) 364{ 365 struct max1720x_device_info *info = power_supply_get_drvdata(psy); 366 unsigned int reg_val; 367 int ret = 0; 368 369 switch (psp) { 370 case POWER_SUPPLY_PROP_HEALTH: 371 ret = max172xx_battery_health(info, ®_val); 372 val->intval = reg_val; 373 break; 374 case POWER_SUPPLY_PROP_PRESENT: 375 /* 376 * POWER_SUPPLY_PROP_PRESENT will always readable via 377 * sysfs interface. Value return 0 if battery not 378 * present or unaccesable via I2c. 379 */ 380 ret = regmap_read(info->regmap, MAX172XX_STATUS, ®_val); 381 if (ret < 0) { 382 val->intval = 0; 383 return 0; 384 } 385 386 val->intval = !FIELD_GET(MAX172XX_STATUS_BAT_ABSENT, reg_val); 387 break; 388 case POWER_SUPPLY_PROP_CAPACITY: 389 ret = regmap_read(info->regmap, MAX172XX_REPSOC, ®_val); 390 val->intval = max172xx_percent_to_ps(reg_val); 391 break; 392 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 393 ret = regmap_read(info->regmap, MAX172XX_BATT, ®_val); 394 val->intval = max172xx_voltage_to_ps(reg_val); 395 break; 396 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 397 ret = regmap_read(info->regmap, MAX172XX_DESIGN_CAP, ®_val); 398 val->intval = max172xx_capacity_to_ps(reg_val, info); 399 break; 400 case POWER_SUPPLY_PROP_CHARGE_AVG: 401 ret = regmap_read(info->regmap, MAX172XX_REPCAP, ®_val); 402 val->intval = max172xx_capacity_to_ps(reg_val, info); 403 break; 404 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: 405 ret = regmap_read(info->regmap, MAX172XX_TTE, ®_val); 406 val->intval = max172xx_time_to_ps(reg_val); 407 break; 408 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG: 409 ret = regmap_read(info->regmap, MAX172XX_TTF, ®_val); 410 val->intval = max172xx_time_to_ps(reg_val); 411 break; 412 case POWER_SUPPLY_PROP_TEMP: 413 ret = regmap_read(info->regmap, MAX172XX_TEMP, ®_val); 414 val->intval = max172xx_temperature_to_ps(reg_val); 415 break; 416 case POWER_SUPPLY_PROP_CURRENT_NOW: 417 ret = regmap_read(info->regmap, MAX172XX_CURRENT, ®_val); 418 val->intval = max172xx_current_to_voltage(reg_val) / info->rsense; 419 break; 420 case POWER_SUPPLY_PROP_CURRENT_AVG: 421 ret = regmap_read(info->regmap, MAX172XX_AVG_CURRENT, ®_val); 422 val->intval = max172xx_current_to_voltage(reg_val) / info->rsense; 423 break; 424 case POWER_SUPPLY_PROP_CHARGE_FULL: 425 ret = regmap_read(info->regmap, MAX172XX_FULL_CAP, ®_val); 426 val->intval = max172xx_capacity_to_ps(reg_val, info); 427 break; 428 case POWER_SUPPLY_PROP_MODEL_NAME: 429 ret = regmap_read(info->regmap, MAX172XX_DEV_NAME, ®_val); 430 if (ret) 431 return ret; 432 reg_val = FIELD_GET(MAX172XX_DEV_NAME_TYPE_MASK, reg_val); 433 if (reg_val == MAX172XX_DEV_NAME_TYPE_MAX17201) 434 val->strval = max17201_model; 435 else if (reg_val == MAX172XX_DEV_NAME_TYPE_MAX17205) 436 val->strval = max17205_model; 437 else 438 return -ENODEV; 439 break; 440 case POWER_SUPPLY_PROP_MANUFACTURER: 441 val->strval = max1720x_manufacturer; 442 break; 443 default: 444 return -EINVAL; 445 } 446 447 return ret; 448} 449 450static int max1720x_read_temp(struct device *dev, u8 reg, char *buf) 451{ 452 struct power_supply *psy = dev_get_drvdata(dev); 453 struct max1720x_device_info *info = power_supply_get_drvdata(psy); 454 unsigned int val; 455 int ret; 456 457 ret = regmap_read(info->regmap_nv, reg, &val); 458 if (ret < 0) 459 return ret; 460 461 /* 462 * Temperature in degrees Celsius starting at absolute zero, -273C or 463 * 0K with an LSb of 0.1C 464 */ 465 return sysfs_emit(buf, "%d\n", val - 2730); 466} 467 468static ssize_t temp_ain1_show(struct device *dev, struct device_attribute *attr, 469 char *buf) 470{ 471 return max1720x_read_temp(dev, MAX172XX_TEMP1, buf); 472} 473 474static ssize_t temp_ain2_show(struct device *dev, struct device_attribute *attr, 475 char *buf) 476{ 477 return max1720x_read_temp(dev, MAX172XX_TEMP2, buf); 478} 479 480static ssize_t temp_int_show(struct device *dev, struct device_attribute *attr, 481 char *buf) 482{ 483 return max1720x_read_temp(dev, MAX172XX_INT_TEMP, buf); 484} 485 486static DEVICE_ATTR_RO(temp_ain1); 487static DEVICE_ATTR_RO(temp_ain2); 488static DEVICE_ATTR_RO(temp_int); 489 490static struct attribute *max1720x_attrs[] = { 491 &dev_attr_temp_ain1.attr, 492 &dev_attr_temp_ain2.attr, 493 &dev_attr_temp_int.attr, 494 NULL 495}; 496ATTRIBUTE_GROUPS(max1720x); 497 498static 499int max1720x_nvmem_reg_read(void *priv, unsigned int off, void *val, size_t len) 500{ 501 struct max1720x_device_info *info = priv; 502 unsigned int reg = MAX1720X_NXTABLE0 + (off / 2); 503 504 return regmap_bulk_read(info->regmap_nv, reg, val, len / 2); 505} 506 507static void max1720x_unregister_ancillary(void *data) 508{ 509 struct max1720x_device_info *info = data; 510 511 i2c_unregister_device(info->ancillary); 512} 513 514static int max1720x_probe_nvmem(struct i2c_client *client, 515 struct max1720x_device_info *info) 516{ 517 struct device *dev = &client->dev; 518 struct nvmem_config nvmem_config = { 519 .dev = dev, 520 .name = "max1720x_nvmem", 521 .cells = max1720x_nvmem_cells, 522 .ncells = ARRAY_SIZE(max1720x_nvmem_cells), 523 .read_only = true, 524 .root_only = true, 525 .reg_read = max1720x_nvmem_reg_read, 526 .size = ARRAY_SIZE(max1720x_nvmem_cells) * 2, 527 .word_size = 2, 528 .stride = 2, 529 .priv = info, 530 }; 531 struct nvmem_device *nvmem; 532 unsigned int val; 533 int ret; 534 535 info->ancillary = i2c_new_ancillary_device(client, "nvmem", 0xb); 536 if (IS_ERR(info->ancillary)) { 537 dev_err(dev, "Failed to initialize ancillary i2c device\n"); 538 return PTR_ERR(info->ancillary); 539 } 540 541 ret = devm_add_action_or_reset(dev, max1720x_unregister_ancillary, info); 542 if (ret) { 543 dev_err(dev, "Failed to add unregister callback\n"); 544 return ret; 545 } 546 547 info->regmap_nv = devm_regmap_init_i2c(info->ancillary, 548 &max1720x_nvmem_regmap_cfg); 549 if (IS_ERR(info->regmap_nv)) { 550 dev_err(dev, "regmap initialization of nvmem failed\n"); 551 return PTR_ERR(info->regmap_nv); 552 } 553 554 ret = regmap_read(info->regmap_nv, MAX1720X_NRSENSE, &val); 555 if (ret < 0) { 556 dev_err(dev, "Failed to read sense resistor value\n"); 557 return ret; 558 } 559 560 info->rsense = val; 561 if (!info->rsense) { 562 dev_warn(dev, "RSense not calibrated, set 10 mOhms!\n"); 563 info->rsense = 1000; /* in regs in 10^-5 */ 564 } 565 566 nvmem = devm_nvmem_register(dev, &nvmem_config); 567 if (IS_ERR(nvmem)) { 568 dev_err(dev, "Could not register nvmem!"); 569 return PTR_ERR(nvmem); 570 } 571 572 return 0; 573} 574 575static const struct power_supply_desc max1720x_bat_desc = { 576 .name = "max1720x", 577 .no_thermal = true, 578 .type = POWER_SUPPLY_TYPE_BATTERY, 579 .properties = max1720x_battery_props, 580 .num_properties = ARRAY_SIZE(max1720x_battery_props), 581 .get_property = max1720x_battery_get_property, 582}; 583 584static int max1720x_probe(struct i2c_client *client) 585{ 586 struct power_supply_config psy_cfg = {}; 587 struct device *dev = &client->dev; 588 struct max1720x_device_info *info; 589 struct power_supply *bat; 590 int ret; 591 592 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); 593 if (!info) 594 return -ENOMEM; 595 596 psy_cfg.drv_data = info; 597 psy_cfg.fwnode = dev_fwnode(dev); 598 psy_cfg.attr_grp = max1720x_groups; 599 i2c_set_clientdata(client, info); 600 info->regmap = devm_regmap_init_i2c(client, &max1720x_regmap_cfg); 601 if (IS_ERR(info->regmap)) 602 return dev_err_probe(dev, PTR_ERR(info->regmap), 603 "regmap initialization failed\n"); 604 605 ret = max1720x_probe_nvmem(client, info); 606 if (ret) 607 return dev_err_probe(dev, ret, "Failed to probe nvmem\n"); 608 609 bat = devm_power_supply_register(dev, &max1720x_bat_desc, &psy_cfg); 610 if (IS_ERR(bat)) 611 return dev_err_probe(dev, PTR_ERR(bat), 612 "Failed to register power supply\n"); 613 614 return 0; 615} 616 617static const struct of_device_id max1720x_of_match[] = { 618 { .compatible = "maxim,max17201" }, 619 {} 620}; 621MODULE_DEVICE_TABLE(of, max1720x_of_match); 622 623static struct i2c_driver max1720x_i2c_driver = { 624 .driver = { 625 .name = "max1720x", 626 .of_match_table = max1720x_of_match, 627 }, 628 .probe = max1720x_probe, 629}; 630module_i2c_driver(max1720x_i2c_driver); 631 632MODULE_LICENSE("GPL"); 633MODULE_AUTHOR("Dimitri Fedrau <dima.fedrau@gmail.com>"); 634MODULE_DESCRIPTION("Maxim MAX17201/MAX17205 Fuel Gauge IC driver");
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