1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * axp288_fuel_gauge.c - Xpower AXP288 PMIC Fuel Gauge Driver 4 * 5 * Copyright (C) 2020-2021 Andrejus Basovas <xxx@yyy.tld> 6 * Copyright (C) 2016-2021 Hans de Goede <hdegoede@redhat.com> 7 * Copyright (C) 2014 Intel Corporation 8 * 9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 10 */ 11 12#include <linux/acpi.h> 13#include <linux/dmi.h> 14#include <linux/module.h> 15#include <linux/kernel.h> 16#include <linux/device.h> 17#include <linux/regmap.h> 18#include <linux/jiffies.h> 19#include <linux/interrupt.h> 20#include <linux/mfd/axp20x.h> 21#include <linux/platform_device.h> 22#include <linux/power_supply.h> 23#include <linux/iio/consumer.h> 24#include <asm/unaligned.h> 25#include <asm/iosf_mbi.h> 26 27#define PS_STAT_VBUS_TRIGGER (1 << 0) 28#define PS_STAT_BAT_CHRG_DIR (1 << 2) 29#define PS_STAT_VBAT_ABOVE_VHOLD (1 << 3) 30#define PS_STAT_VBUS_VALID (1 << 4) 31#define PS_STAT_VBUS_PRESENT (1 << 5) 32 33#define CHRG_STAT_BAT_SAFE_MODE (1 << 3) 34#define CHRG_STAT_BAT_VALID (1 << 4) 35#define CHRG_STAT_BAT_PRESENT (1 << 5) 36#define CHRG_STAT_CHARGING (1 << 6) 37#define CHRG_STAT_PMIC_OTP (1 << 7) 38 39#define CHRG_CCCV_CC_MASK 0xf /* 4 bits */ 40#define CHRG_CCCV_CC_BIT_POS 0 41#define CHRG_CCCV_CC_OFFSET 200 /* 200mA */ 42#define CHRG_CCCV_CC_LSB_RES 200 /* 200mA */ 43#define CHRG_CCCV_ITERM_20P (1 << 4) /* 20% of CC */ 44#define CHRG_CCCV_CV_MASK 0x60 /* 2 bits */ 45#define CHRG_CCCV_CV_BIT_POS 5 46#define CHRG_CCCV_CV_4100MV 0x0 /* 4.10V */ 47#define CHRG_CCCV_CV_4150MV 0x1 /* 4.15V */ 48#define CHRG_CCCV_CV_4200MV 0x2 /* 4.20V */ 49#define CHRG_CCCV_CV_4350MV 0x3 /* 4.35V */ 50#define CHRG_CCCV_CHG_EN (1 << 7) 51 52#define FG_CNTL_OCV_ADJ_STAT (1 << 2) 53#define FG_CNTL_OCV_ADJ_EN (1 << 3) 54#define FG_CNTL_CAP_ADJ_STAT (1 << 4) 55#define FG_CNTL_CAP_ADJ_EN (1 << 5) 56#define FG_CNTL_CC_EN (1 << 6) 57#define FG_CNTL_GAUGE_EN (1 << 7) 58 59#define FG_15BIT_WORD_VALID (1 << 15) 60#define FG_15BIT_VAL_MASK 0x7fff 61 62#define FG_REP_CAP_VALID (1 << 7) 63#define FG_REP_CAP_VAL_MASK 0x7F 64 65#define FG_DES_CAP1_VALID (1 << 7) 66#define FG_DES_CAP_RES_LSB 1456 /* 1.456mAhr */ 67 68#define FG_DES_CC_RES_LSB 1456 /* 1.456mAhr */ 69 70#define FG_OCV_CAP_VALID (1 << 7) 71#define FG_OCV_CAP_VAL_MASK 0x7F 72#define FG_CC_CAP_VALID (1 << 7) 73#define FG_CC_CAP_VAL_MASK 0x7F 74 75#define FG_LOW_CAP_THR1_MASK 0xf0 /* 5% tp 20% */ 76#define FG_LOW_CAP_THR1_VAL 0xa0 /* 15 perc */ 77#define FG_LOW_CAP_THR2_MASK 0x0f /* 0% to 15% */ 78#define FG_LOW_CAP_WARN_THR 14 /* 14 perc */ 79#define FG_LOW_CAP_CRIT_THR 4 /* 4 perc */ 80#define FG_LOW_CAP_SHDN_THR 0 /* 0 perc */ 81 82#define DEV_NAME "axp288_fuel_gauge" 83 84/* 1.1mV per LSB expressed in uV */ 85#define VOLTAGE_FROM_ADC(a) ((a * 11) / 10) 86/* properties converted to uV, uA */ 87#define PROP_VOLT(a) ((a) * 1000) 88#define PROP_CURR(a) ((a) * 1000) 89 90#define AXP288_REG_UPDATE_INTERVAL (60 * HZ) 91#define AXP288_FG_INTR_NUM 6 92 93#define AXP288_QUIRK_NO_BATTERY BIT(0) 94 95static bool no_current_sense_res; 96module_param(no_current_sense_res, bool, 0444); 97MODULE_PARM_DESC(no_current_sense_res, "No (or broken) current sense resistor"); 98 99enum { 100 QWBTU_IRQ = 0, 101 WBTU_IRQ, 102 QWBTO_IRQ, 103 WBTO_IRQ, 104 WL2_IRQ, 105 WL1_IRQ, 106}; 107 108enum { 109 BAT_CHRG_CURR, 110 BAT_D_CURR, 111 BAT_VOLT, 112 IIO_CHANNEL_NUM 113}; 114 115struct axp288_fg_info { 116 struct device *dev; 117 struct regmap *regmap; 118 int irq[AXP288_FG_INTR_NUM]; 119 struct iio_channel *iio_channel[IIO_CHANNEL_NUM]; 120 struct power_supply *bat; 121 struct mutex lock; 122 int status; 123 int max_volt; 124 int pwr_op; 125 int low_cap; 126 struct dentry *debug_file; 127 128 char valid; /* zero until following fields are valid */ 129 unsigned long last_updated; /* in jiffies */ 130 131 int pwr_stat; 132 int fg_res; 133 int bat_volt; 134 int d_curr; 135 int c_curr; 136 int ocv; 137 int fg_cc_mtr1; 138 int fg_des_cap1; 139}; 140 141static enum power_supply_property fuel_gauge_props[] = { 142 POWER_SUPPLY_PROP_STATUS, 143 POWER_SUPPLY_PROP_PRESENT, 144 POWER_SUPPLY_PROP_HEALTH, 145 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 146 POWER_SUPPLY_PROP_VOLTAGE_NOW, 147 POWER_SUPPLY_PROP_VOLTAGE_OCV, 148 POWER_SUPPLY_PROP_CAPACITY, 149 POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN, 150 POWER_SUPPLY_PROP_TECHNOLOGY, 151 /* The 3 props below are not used when no_current_sense_res is set */ 152 POWER_SUPPLY_PROP_CHARGE_FULL, 153 POWER_SUPPLY_PROP_CHARGE_NOW, 154 POWER_SUPPLY_PROP_CURRENT_NOW, 155}; 156 157static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg) 158{ 159 unsigned int val; 160 int ret; 161 162 ret = regmap_read(info->regmap, reg, &val); 163 if (ret < 0) { 164 dev_err(info->dev, "Error reading reg 0x%02x err: %d\n", reg, ret); 165 return ret; 166 } 167 168 return val; 169} 170 171static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val) 172{ 173 int ret; 174 175 ret = regmap_write(info->regmap, reg, (unsigned int)val); 176 177 if (ret < 0) 178 dev_err(info->dev, "Error writing reg 0x%02x err: %d\n", reg, ret); 179 180 return ret; 181} 182 183static int fuel_gauge_read_15bit_word(struct axp288_fg_info *info, int reg) 184{ 185 unsigned char buf[2]; 186 int ret; 187 188 ret = regmap_bulk_read(info->regmap, reg, buf, 2); 189 if (ret < 0) { 190 dev_err(info->dev, "Error reading reg 0x%02x err: %d\n", reg, ret); 191 return ret; 192 } 193 194 ret = get_unaligned_be16(buf); 195 if (!(ret & FG_15BIT_WORD_VALID)) { 196 dev_err(info->dev, "Error reg 0x%02x contents not valid\n", reg); 197 return -ENXIO; 198 } 199 200 return ret & FG_15BIT_VAL_MASK; 201} 202 203static int fuel_gauge_read_12bit_word(struct axp288_fg_info *info, int reg) 204{ 205 unsigned char buf[2]; 206 int ret; 207 208 ret = regmap_bulk_read(info->regmap, reg, buf, 2); 209 if (ret < 0) { 210 dev_err(info->dev, "Error reading reg 0x%02x err: %d\n", reg, ret); 211 return ret; 212 } 213 214 /* 12-bit data values have upper 8 bits in buf[0], lower 4 in buf[1] */ 215 return (buf[0] << 4) | ((buf[1] >> 4) & 0x0f); 216} 217 218static int fuel_gauge_update_registers(struct axp288_fg_info *info) 219{ 220 int ret; 221 222 if (info->valid && time_before(jiffies, info->last_updated + AXP288_REG_UPDATE_INTERVAL)) 223 return 0; 224 225 dev_dbg(info->dev, "Fuel Gauge updating register values...\n"); 226 227 ret = iosf_mbi_block_punit_i2c_access(); 228 if (ret < 0) 229 return ret; 230 231 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS); 232 if (ret < 0) 233 goto out; 234 info->pwr_stat = ret; 235 236 if (no_current_sense_res) 237 ret = fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG); 238 else 239 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES); 240 if (ret < 0) 241 goto out; 242 info->fg_res = ret; 243 244 ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &info->bat_volt); 245 if (ret < 0) 246 goto out; 247 248 ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG); 249 if (ret < 0) 250 goto out; 251 info->ocv = ret; 252 253 if (no_current_sense_res) 254 goto out_no_current_sense_res; 255 256 if (info->pwr_stat & PS_STAT_BAT_CHRG_DIR) { 257 info->d_curr = 0; 258 ret = iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], &info->c_curr); 259 if (ret < 0) 260 goto out; 261 } else { 262 info->c_curr = 0; 263 ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &info->d_curr); 264 if (ret < 0) 265 goto out; 266 } 267 268 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG); 269 if (ret < 0) 270 goto out; 271 info->fg_cc_mtr1 = ret; 272 273 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG); 274 if (ret < 0) 275 goto out; 276 info->fg_des_cap1 = ret; 277 278out_no_current_sense_res: 279 info->last_updated = jiffies; 280 info->valid = 1; 281 ret = 0; 282out: 283 iosf_mbi_unblock_punit_i2c_access(); 284 return ret; 285} 286 287static void fuel_gauge_get_status(struct axp288_fg_info *info) 288{ 289 int pwr_stat = info->pwr_stat; 290 int fg_res = info->fg_res; 291 int curr = info->d_curr; 292 293 /* Report full if Vbus is valid and the reported capacity is 100% */ 294 if (!(pwr_stat & PS_STAT_VBUS_VALID)) 295 goto not_full; 296 297 if (!(fg_res & FG_REP_CAP_VALID)) 298 goto not_full; 299 300 fg_res &= ~FG_REP_CAP_VALID; 301 if (fg_res == 100) { 302 info->status = POWER_SUPPLY_STATUS_FULL; 303 return; 304 } 305 306 /* 307 * Sometimes the charger turns itself off before fg-res reaches 100%. 308 * When this happens the AXP288 reports a not-charging status and 309 * 0 mA discharge current. 310 */ 311 if (fg_res < 90 || (pwr_stat & PS_STAT_BAT_CHRG_DIR) || no_current_sense_res) 312 goto not_full; 313 314 if (curr == 0) { 315 info->status = POWER_SUPPLY_STATUS_FULL; 316 return; 317 } 318 319not_full: 320 if (pwr_stat & PS_STAT_BAT_CHRG_DIR) 321 info->status = POWER_SUPPLY_STATUS_CHARGING; 322 else 323 info->status = POWER_SUPPLY_STATUS_DISCHARGING; 324} 325 326static int fuel_gauge_battery_health(struct axp288_fg_info *info) 327{ 328 int vocv = VOLTAGE_FROM_ADC(info->ocv); 329 int health = POWER_SUPPLY_HEALTH_UNKNOWN; 330 331 if (vocv > info->max_volt) 332 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 333 else 334 health = POWER_SUPPLY_HEALTH_GOOD; 335 336 return health; 337} 338 339static int fuel_gauge_get_property(struct power_supply *ps, 340 enum power_supply_property prop, 341 union power_supply_propval *val) 342{ 343 struct axp288_fg_info *info = power_supply_get_drvdata(ps); 344 int ret, value; 345 346 mutex_lock(&info->lock); 347 348 ret = fuel_gauge_update_registers(info); 349 if (ret < 0) 350 goto out; 351 352 switch (prop) { 353 case POWER_SUPPLY_PROP_STATUS: 354 fuel_gauge_get_status(info); 355 val->intval = info->status; 356 break; 357 case POWER_SUPPLY_PROP_HEALTH: 358 val->intval = fuel_gauge_battery_health(info); 359 break; 360 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 361 value = VOLTAGE_FROM_ADC(info->bat_volt); 362 val->intval = PROP_VOLT(value); 363 break; 364 case POWER_SUPPLY_PROP_VOLTAGE_OCV: 365 value = VOLTAGE_FROM_ADC(info->ocv); 366 val->intval = PROP_VOLT(value); 367 break; 368 case POWER_SUPPLY_PROP_CURRENT_NOW: 369 if (info->d_curr > 0) 370 value = -1 * info->d_curr; 371 else 372 value = info->c_curr; 373 374 val->intval = PROP_CURR(value); 375 break; 376 case POWER_SUPPLY_PROP_PRESENT: 377 if (info->pwr_op & CHRG_STAT_BAT_PRESENT) 378 val->intval = 1; 379 else 380 val->intval = 0; 381 break; 382 case POWER_SUPPLY_PROP_CAPACITY: 383 if (!(info->fg_res & FG_REP_CAP_VALID)) 384 dev_err(info->dev, "capacity measurement not valid\n"); 385 val->intval = (info->fg_res & FG_REP_CAP_VAL_MASK); 386 break; 387 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: 388 val->intval = (info->low_cap & 0x0f); 389 break; 390 case POWER_SUPPLY_PROP_TECHNOLOGY: 391 val->intval = POWER_SUPPLY_TECHNOLOGY_LION; 392 break; 393 case POWER_SUPPLY_PROP_CHARGE_NOW: 394 val->intval = info->fg_cc_mtr1 * FG_DES_CAP_RES_LSB; 395 break; 396 case POWER_SUPPLY_PROP_CHARGE_FULL: 397 val->intval = info->fg_des_cap1 * FG_DES_CAP_RES_LSB; 398 break; 399 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 400 val->intval = PROP_VOLT(info->max_volt); 401 break; 402 default: 403 ret = -EINVAL; 404 } 405 406out: 407 mutex_unlock(&info->lock); 408 return ret; 409} 410 411static int fuel_gauge_set_property(struct power_supply *ps, 412 enum power_supply_property prop, 413 const union power_supply_propval *val) 414{ 415 struct axp288_fg_info *info = power_supply_get_drvdata(ps); 416 int new_low_cap, ret = 0; 417 418 mutex_lock(&info->lock); 419 switch (prop) { 420 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: 421 if ((val->intval < 0) || (val->intval > 15)) { 422 ret = -EINVAL; 423 break; 424 } 425 new_low_cap = info->low_cap; 426 new_low_cap &= 0xf0; 427 new_low_cap |= (val->intval & 0xf); 428 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, new_low_cap); 429 if (ret == 0) 430 info->low_cap = new_low_cap; 431 break; 432 default: 433 ret = -EINVAL; 434 break; 435 } 436 437 mutex_unlock(&info->lock); 438 return ret; 439} 440 441static int fuel_gauge_property_is_writeable(struct power_supply *psy, 442 enum power_supply_property psp) 443{ 444 int ret; 445 446 switch (psp) { 447 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: 448 ret = 1; 449 break; 450 default: 451 ret = 0; 452 } 453 454 return ret; 455} 456 457static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev) 458{ 459 struct axp288_fg_info *info = dev; 460 int i; 461 462 for (i = 0; i < AXP288_FG_INTR_NUM; i++) { 463 if (info->irq[i] == irq) 464 break; 465 } 466 467 if (i >= AXP288_FG_INTR_NUM) { 468 dev_warn(info->dev, "spurious interrupt!!\n"); 469 return IRQ_NONE; 470 } 471 472 switch (i) { 473 case QWBTU_IRQ: 474 dev_info(info->dev, "Quit Battery under temperature in work mode IRQ (QWBTU)\n"); 475 break; 476 case WBTU_IRQ: 477 dev_info(info->dev, "Battery under temperature in work mode IRQ (WBTU)\n"); 478 break; 479 case QWBTO_IRQ: 480 dev_info(info->dev, "Quit Battery over temperature in work mode IRQ (QWBTO)\n"); 481 break; 482 case WBTO_IRQ: 483 dev_info(info->dev, "Battery over temperature in work mode IRQ (WBTO)\n"); 484 break; 485 case WL2_IRQ: 486 dev_info(info->dev, "Low Batt Warning(2) INTR\n"); 487 break; 488 case WL1_IRQ: 489 dev_info(info->dev, "Low Batt Warning(1) INTR\n"); 490 break; 491 default: 492 dev_warn(info->dev, "Spurious Interrupt!!!\n"); 493 } 494 495 mutex_lock(&info->lock); 496 info->valid = 0; /* Force updating of the cached registers */ 497 mutex_unlock(&info->lock); 498 499 power_supply_changed(info->bat); 500 return IRQ_HANDLED; 501} 502 503static void fuel_gauge_external_power_changed(struct power_supply *psy) 504{ 505 struct axp288_fg_info *info = power_supply_get_drvdata(psy); 506 507 mutex_lock(&info->lock); 508 info->valid = 0; /* Force updating of the cached registers */ 509 mutex_unlock(&info->lock); 510 power_supply_changed(psy); 511} 512 513static struct power_supply_desc fuel_gauge_desc = { 514 .name = DEV_NAME, 515 .type = POWER_SUPPLY_TYPE_BATTERY, 516 .properties = fuel_gauge_props, 517 .num_properties = ARRAY_SIZE(fuel_gauge_props), 518 .get_property = fuel_gauge_get_property, 519 .set_property = fuel_gauge_set_property, 520 .property_is_writeable = fuel_gauge_property_is_writeable, 521 .external_power_changed = fuel_gauge_external_power_changed, 522}; 523 524/* 525 * Some devices have no battery (HDMI sticks) and the axp288 battery's 526 * detection reports one despite it not being there. 527 * Please keep this listed sorted alphabetically. 528 */ 529static const struct dmi_system_id axp288_quirks[] = { 530 { 531 /* ACEPC T8 Cherry Trail Z8350 mini PC */ 532 .matches = { 533 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."), 534 DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"), 535 DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T8"), 536 /* also match on somewhat unique bios-version */ 537 DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"), 538 }, 539 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY, 540 }, 541 { 542 /* ACEPC T11 Cherry Trail Z8350 mini PC */ 543 .matches = { 544 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."), 545 DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"), 546 DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T11"), 547 /* also match on somewhat unique bios-version */ 548 DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"), 549 }, 550 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY, 551 }, 552 { 553 /* Intel Cherry Trail Compute Stick, Windows version */ 554 .matches = { 555 DMI_MATCH(DMI_SYS_VENDOR, "Intel"), 556 DMI_MATCH(DMI_PRODUCT_NAME, "STK1AW32SC"), 557 }, 558 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY, 559 }, 560 { 561 /* Intel Cherry Trail Compute Stick, version without an OS */ 562 .matches = { 563 DMI_MATCH(DMI_SYS_VENDOR, "Intel"), 564 DMI_MATCH(DMI_PRODUCT_NAME, "STK1A32SC"), 565 }, 566 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY, 567 }, 568 { 569 /* Meegopad T02 */ 570 .matches = { 571 DMI_MATCH(DMI_PRODUCT_NAME, "MEEGOPAD T02"), 572 }, 573 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY, 574 }, 575 { /* Mele PCG03 Mini PC */ 576 .matches = { 577 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "Mini PC"), 578 DMI_EXACT_MATCH(DMI_BOARD_NAME, "Mini PC"), 579 }, 580 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY, 581 }, 582 { 583 /* Minix Neo Z83-4 mini PC */ 584 .matches = { 585 DMI_MATCH(DMI_SYS_VENDOR, "MINIX"), 586 DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"), 587 }, 588 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY, 589 }, 590 { 591 /* 592 * One Mix 1, this uses the "T3 MRD" boardname used by 593 * generic mini PCs, but it is a mini laptop so it does 594 * actually have a battery! 595 */ 596 .matches = { 597 DMI_MATCH(DMI_BOARD_NAME, "T3 MRD"), 598 DMI_MATCH(DMI_BIOS_DATE, "06/14/2018"), 599 }, 600 .driver_data = NULL, 601 }, 602 { 603 /* 604 * Various Ace PC/Meegopad/MinisForum/Wintel Mini-PCs/HDMI-sticks 605 * This entry must be last because it is generic, this allows 606 * adding more specifuc quirks overriding this generic entry. 607 */ 608 .matches = { 609 DMI_MATCH(DMI_BOARD_NAME, "T3 MRD"), 610 DMI_MATCH(DMI_CHASSIS_TYPE, "3"), 611 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 612 }, 613 .driver_data = (void *)AXP288_QUIRK_NO_BATTERY, 614 }, 615 {} 616}; 617 618static int axp288_fuel_gauge_read_initial_regs(struct axp288_fg_info *info) 619{ 620 unsigned int val; 621 int ret; 622 623 /* 624 * On some devices the fuelgauge and charger parts of the axp288 are 625 * not used, check that the fuelgauge is enabled (CC_CTRL != 0). 626 */ 627 ret = regmap_read(info->regmap, AXP20X_CC_CTRL, &val); 628 if (ret < 0) 629 return ret; 630 if (val == 0) 631 return -ENODEV; 632 633 ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG); 634 if (ret < 0) 635 return ret; 636 637 if (!(ret & FG_DES_CAP1_VALID)) { 638 dev_err(info->dev, "axp288 not configured by firmware\n"); 639 return -ENODEV; 640 } 641 642 ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1); 643 if (ret < 0) 644 return ret; 645 switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) { 646 case CHRG_CCCV_CV_4100MV: 647 info->max_volt = 4100; 648 break; 649 case CHRG_CCCV_CV_4150MV: 650 info->max_volt = 4150; 651 break; 652 case CHRG_CCCV_CV_4200MV: 653 info->max_volt = 4200; 654 break; 655 case CHRG_CCCV_CV_4350MV: 656 info->max_volt = 4350; 657 break; 658 } 659 660 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE); 661 if (ret < 0) 662 return ret; 663 info->pwr_op = ret; 664 665 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG); 666 if (ret < 0) 667 return ret; 668 info->low_cap = ret; 669 670 return 0; 671} 672 673static void axp288_fuel_gauge_release_iio_chans(void *data) 674{ 675 struct axp288_fg_info *info = data; 676 int i; 677 678 for (i = 0; i < IIO_CHANNEL_NUM; i++) 679 if (!IS_ERR_OR_NULL(info->iio_channel[i])) 680 iio_channel_release(info->iio_channel[i]); 681} 682 683static int axp288_fuel_gauge_probe(struct platform_device *pdev) 684{ 685 struct axp288_fg_info *info; 686 struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); 687 struct power_supply_config psy_cfg = {}; 688 static const char * const iio_chan_name[] = { 689 [BAT_CHRG_CURR] = "axp288-chrg-curr", 690 [BAT_D_CURR] = "axp288-chrg-d-curr", 691 [BAT_VOLT] = "axp288-batt-volt", 692 }; 693 const struct dmi_system_id *dmi_id; 694 struct device *dev = &pdev->dev; 695 unsigned long quirks = 0; 696 int i, pirq, ret; 697 698 /* 699 * Normally the native AXP288 fg/charger drivers are preferred but 700 * on some devices the ACPI drivers should be used instead. 701 */ 702 if (!acpi_quirk_skip_acpi_ac_and_battery()) 703 return -ENODEV; 704 705 dmi_id = dmi_first_match(axp288_quirks); 706 if (dmi_id) 707 quirks = (unsigned long)dmi_id->driver_data; 708 709 if (quirks & AXP288_QUIRK_NO_BATTERY) 710 return -ENODEV; 711 712 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); 713 if (!info) 714 return -ENOMEM; 715 716 info->dev = dev; 717 info->regmap = axp20x->regmap; 718 info->status = POWER_SUPPLY_STATUS_UNKNOWN; 719 info->valid = 0; 720 721 platform_set_drvdata(pdev, info); 722 723 mutex_init(&info->lock); 724 725 for (i = 0; i < AXP288_FG_INTR_NUM; i++) { 726 pirq = platform_get_irq(pdev, i); 727 if (pirq < 0) 728 continue; 729 ret = regmap_irq_get_virq(axp20x->regmap_irqc, pirq); 730 if (ret < 0) 731 return dev_err_probe(dev, ret, "getting vIRQ %d\n", pirq); 732 733 info->irq[i] = ret; 734 } 735 736 for (i = 0; i < IIO_CHANNEL_NUM; i++) { 737 /* 738 * Note cannot use devm_iio_channel_get because x86 systems 739 * lack the device<->channel maps which iio_channel_get will 740 * try to use when passed a non NULL device pointer. 741 */ 742 info->iio_channel[i] = 743 iio_channel_get(NULL, iio_chan_name[i]); 744 if (IS_ERR(info->iio_channel[i])) { 745 ret = PTR_ERR(info->iio_channel[i]); 746 dev_dbg(dev, "error getting iiochan %s: %d\n", iio_chan_name[i], ret); 747 /* Wait for axp288_adc to load */ 748 if (ret == -ENODEV) 749 ret = -EPROBE_DEFER; 750 751 axp288_fuel_gauge_release_iio_chans(info); 752 return ret; 753 } 754 } 755 756 ret = devm_add_action_or_reset(dev, axp288_fuel_gauge_release_iio_chans, info); 757 if (ret) 758 return ret; 759 760 ret = iosf_mbi_block_punit_i2c_access(); 761 if (ret < 0) 762 return ret; 763 764 ret = axp288_fuel_gauge_read_initial_regs(info); 765 iosf_mbi_unblock_punit_i2c_access(); 766 if (ret < 0) 767 return ret; 768 769 psy_cfg.drv_data = info; 770 if (no_current_sense_res) 771 fuel_gauge_desc.num_properties = ARRAY_SIZE(fuel_gauge_props) - 3; 772 info->bat = devm_power_supply_register(dev, &fuel_gauge_desc, &psy_cfg); 773 if (IS_ERR(info->bat)) { 774 ret = PTR_ERR(info->bat); 775 dev_err(dev, "failed to register battery: %d\n", ret); 776 return ret; 777 } 778 779 for (i = 0; i < AXP288_FG_INTR_NUM; i++) { 780 ret = devm_request_threaded_irq(dev, info->irq[i], NULL, 781 fuel_gauge_thread_handler, 782 IRQF_ONESHOT, DEV_NAME, info); 783 if (ret) 784 return dev_err_probe(dev, ret, "requesting IRQ %d\n", info->irq[i]); 785 } 786 787 return 0; 788} 789 790static const struct platform_device_id axp288_fg_id_table[] = { 791 { .name = DEV_NAME }, 792 {}, 793}; 794MODULE_DEVICE_TABLE(platform, axp288_fg_id_table); 795 796static struct platform_driver axp288_fuel_gauge_driver = { 797 .probe = axp288_fuel_gauge_probe, 798 .id_table = axp288_fg_id_table, 799 .driver = { 800 .name = DEV_NAME, 801 }, 802}; 803 804module_platform_driver(axp288_fuel_gauge_driver); 805 806MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>"); 807MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>"); 808MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver"); 809MODULE_LICENSE("GPL"); 810