1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * axp288_fuel_gauge.c - Xpower AXP288 PMIC Fuel Gauge Driver 4 * 5 * Copyright (C) 2016-2017 Hans de Goede <hdegoede@redhat.com> 6 * Copyright (C) 2014 Intel Corporation 7 * 8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 9 */ 10 11 #include <linux/dmi.h> 12 #include <linux/module.h> 13 #include <linux/kernel.h> 14 #include <linux/device.h> 15 #include <linux/regmap.h> 16 #include <linux/jiffies.h> 17 #include <linux/interrupt.h> 18 #include <linux/mfd/axp20x.h> 19 #include <linux/platform_device.h> 20 #include <linux/power_supply.h> 21 #include <linux/iio/consumer.h> 22 #include <linux/debugfs.h> 23 #include <linux/seq_file.h> 24 #include <asm/unaligned.h> 25 26 #define PS_STAT_VBUS_TRIGGER (1 << 0) 27 #define PS_STAT_BAT_CHRG_DIR (1 << 2) 28 #define PS_STAT_VBAT_ABOVE_VHOLD (1 << 3) 29 #define PS_STAT_VBUS_VALID (1 << 4) 30 #define PS_STAT_VBUS_PRESENT (1 << 5) 31 32 #define CHRG_STAT_BAT_SAFE_MODE (1 << 3) 33 #define CHRG_STAT_BAT_VALID (1 << 4) 34 #define CHRG_STAT_BAT_PRESENT (1 << 5) 35 #define CHRG_STAT_CHARGING (1 << 6) 36 #define CHRG_STAT_PMIC_OTP (1 << 7) 37 38 #define CHRG_CCCV_CC_MASK 0xf /* 4 bits */ 39 #define CHRG_CCCV_CC_BIT_POS 0 40 #define CHRG_CCCV_CC_OFFSET 200 /* 200mA */ 41 #define CHRG_CCCV_CC_LSB_RES 200 /* 200mA */ 42 #define CHRG_CCCV_ITERM_20P (1 << 4) /* 20% of CC */ 43 #define CHRG_CCCV_CV_MASK 0x60 /* 2 bits */ 44 #define CHRG_CCCV_CV_BIT_POS 5 45 #define CHRG_CCCV_CV_4100MV 0x0 /* 4.10V */ 46 #define CHRG_CCCV_CV_4150MV 0x1 /* 4.15V */ 47 #define CHRG_CCCV_CV_4200MV 0x2 /* 4.20V */ 48 #define CHRG_CCCV_CV_4350MV 0x3 /* 4.35V */ 49 #define CHRG_CCCV_CHG_EN (1 << 7) 50 51 #define FG_CNTL_OCV_ADJ_STAT (1 << 2) 52 #define FG_CNTL_OCV_ADJ_EN (1 << 3) 53 #define FG_CNTL_CAP_ADJ_STAT (1 << 4) 54 #define FG_CNTL_CAP_ADJ_EN (1 << 5) 55 #define FG_CNTL_CC_EN (1 << 6) 56 #define FG_CNTL_GAUGE_EN (1 << 7) 57 58 #define FG_15BIT_WORD_VALID (1 << 15) 59 #define FG_15BIT_VAL_MASK 0x7fff 60 61 #define FG_REP_CAP_VALID (1 << 7) 62 #define FG_REP_CAP_VAL_MASK 0x7F 63 64 #define FG_DES_CAP1_VALID (1 << 7) 65 #define FG_DES_CAP_RES_LSB 1456 /* 1.456mAhr */ 66 67 #define FG_DES_CC_RES_LSB 1456 /* 1.456mAhr */ 68 69 #define FG_OCV_CAP_VALID (1 << 7) 70 #define FG_OCV_CAP_VAL_MASK 0x7F 71 #define FG_CC_CAP_VALID (1 << 7) 72 #define FG_CC_CAP_VAL_MASK 0x7F 73 74 #define FG_LOW_CAP_THR1_MASK 0xf0 /* 5% tp 20% */ 75 #define FG_LOW_CAP_THR1_VAL 0xa0 /* 15 perc */ 76 #define FG_LOW_CAP_THR2_MASK 0x0f /* 0% to 15% */ 77 #define FG_LOW_CAP_WARN_THR 14 /* 14 perc */ 78 #define FG_LOW_CAP_CRIT_THR 4 /* 4 perc */ 79 #define FG_LOW_CAP_SHDN_THR 0 /* 0 perc */ 80 81 #define NR_RETRY_CNT 3 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_FG_INTR_NUM 6 91 enum { 92 QWBTU_IRQ = 0, 93 WBTU_IRQ, 94 QWBTO_IRQ, 95 WBTO_IRQ, 96 WL2_IRQ, 97 WL1_IRQ, 98 }; 99 100 enum { 101 BAT_TEMP = 0, 102 PMIC_TEMP, 103 SYSTEM_TEMP, 104 BAT_CHRG_CURR, 105 BAT_D_CURR, 106 BAT_VOLT, 107 IIO_CHANNEL_NUM 108 }; 109 110 struct axp288_fg_info { 111 struct platform_device *pdev; 112 struct regmap *regmap; 113 struct regmap_irq_chip_data *regmap_irqc; 114 int irq[AXP288_FG_INTR_NUM]; 115 struct iio_channel *iio_channel[IIO_CHANNEL_NUM]; 116 struct power_supply *bat; 117 struct mutex lock; 118 int status; 119 int max_volt; 120 struct dentry *debug_file; 121 }; 122 123 static enum power_supply_property fuel_gauge_props[] = { 124 POWER_SUPPLY_PROP_STATUS, 125 POWER_SUPPLY_PROP_PRESENT, 126 POWER_SUPPLY_PROP_HEALTH, 127 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 128 POWER_SUPPLY_PROP_VOLTAGE_NOW, 129 POWER_SUPPLY_PROP_VOLTAGE_OCV, 130 POWER_SUPPLY_PROP_CURRENT_NOW, 131 POWER_SUPPLY_PROP_CAPACITY, 132 POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN, 133 POWER_SUPPLY_PROP_TECHNOLOGY, 134 POWER_SUPPLY_PROP_CHARGE_FULL, 135 POWER_SUPPLY_PROP_CHARGE_NOW, 136 }; 137 138 static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg) 139 { 140 int ret, i; 141 unsigned int val; 142 143 for (i = 0; i < NR_RETRY_CNT; i++) { 144 ret = regmap_read(info->regmap, reg, &val); 145 if (ret == -EBUSY) 146 continue; 147 else 148 break; 149 } 150 151 if (ret < 0) { 152 dev_err(&info->pdev->dev, "axp288 reg read err:%d\n", ret); 153 return ret; 154 } 155 156 return val; 157 } 158 159 static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val) 160 { 161 int ret; 162 163 ret = regmap_write(info->regmap, reg, (unsigned int)val); 164 165 if (ret < 0) 166 dev_err(&info->pdev->dev, "axp288 reg write err:%d\n", ret); 167 168 return ret; 169 } 170 171 static int fuel_gauge_read_15bit_word(struct axp288_fg_info *info, int reg) 172 { 173 unsigned char buf[2]; 174 int ret; 175 176 ret = regmap_bulk_read(info->regmap, reg, buf, 2); 177 if (ret < 0) { 178 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n", 179 reg, ret); 180 return ret; 181 } 182 183 ret = get_unaligned_be16(buf); 184 if (!(ret & FG_15BIT_WORD_VALID)) { 185 dev_err(&info->pdev->dev, "Error reg 0x%02x contents not valid\n", 186 reg); 187 return -ENXIO; 188 } 189 190 return ret & FG_15BIT_VAL_MASK; 191 } 192 193 static int fuel_gauge_read_12bit_word(struct axp288_fg_info *info, int reg) 194 { 195 unsigned char buf[2]; 196 int ret; 197 198 ret = regmap_bulk_read(info->regmap, reg, buf, 2); 199 if (ret < 0) { 200 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n", 201 reg, ret); 202 return ret; 203 } 204 205 /* 12-bit data values have upper 8 bits in buf[0], lower 4 in buf[1] */ 206 return (buf[0] << 4) | ((buf[1] >> 4) & 0x0f); 207 } 208 209 #ifdef CONFIG_DEBUG_FS 210 static int fuel_gauge_debug_show(struct seq_file *s, void *data) 211 { 212 struct axp288_fg_info *info = s->private; 213 int raw_val, ret; 214 215 seq_printf(s, " PWR_STATUS[%02x] : %02x\n", 216 AXP20X_PWR_INPUT_STATUS, 217 fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS)); 218 seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n", 219 AXP20X_PWR_OP_MODE, 220 fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE)); 221 seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n", 222 AXP20X_CHRG_CTRL1, 223 fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1)); 224 seq_printf(s, " VLTF[%02x] : %02x\n", 225 AXP20X_V_LTF_DISCHRG, 226 fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG)); 227 seq_printf(s, " VHTF[%02x] : %02x\n", 228 AXP20X_V_HTF_DISCHRG, 229 fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG)); 230 seq_printf(s, " CC_CTRL[%02x] : %02x\n", 231 AXP20X_CC_CTRL, 232 fuel_gauge_reg_readb(info, AXP20X_CC_CTRL)); 233 seq_printf(s, "BATTERY CAP[%02x] : %02x\n", 234 AXP20X_FG_RES, 235 fuel_gauge_reg_readb(info, AXP20X_FG_RES)); 236 seq_printf(s, " FG_RDC1[%02x] : %02x\n", 237 AXP288_FG_RDC1_REG, 238 fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG)); 239 seq_printf(s, " FG_RDC0[%02x] : %02x\n", 240 AXP288_FG_RDC0_REG, 241 fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG)); 242 seq_printf(s, " FG_OCV[%02x] : %04x\n", 243 AXP288_FG_OCVH_REG, 244 fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG)); 245 seq_printf(s, " FG_DES_CAP[%02x] : %04x\n", 246 AXP288_FG_DES_CAP1_REG, 247 fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG)); 248 seq_printf(s, " FG_CC_MTR[%02x] : %04x\n", 249 AXP288_FG_CC_MTR1_REG, 250 fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG)); 251 seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n", 252 AXP288_FG_OCV_CAP_REG, 253 fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG)); 254 seq_printf(s, " FG_CC_CAP[%02x] : %02x\n", 255 AXP288_FG_CC_CAP_REG, 256 fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG)); 257 seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n", 258 AXP288_FG_LOW_CAP_REG, 259 fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG)); 260 seq_printf(s, "TUNING_CTL0[%02x] : %02x\n", 261 AXP288_FG_TUNE0, 262 fuel_gauge_reg_readb(info, AXP288_FG_TUNE0)); 263 seq_printf(s, "TUNING_CTL1[%02x] : %02x\n", 264 AXP288_FG_TUNE1, 265 fuel_gauge_reg_readb(info, AXP288_FG_TUNE1)); 266 seq_printf(s, "TUNING_CTL2[%02x] : %02x\n", 267 AXP288_FG_TUNE2, 268 fuel_gauge_reg_readb(info, AXP288_FG_TUNE2)); 269 seq_printf(s, "TUNING_CTL3[%02x] : %02x\n", 270 AXP288_FG_TUNE3, 271 fuel_gauge_reg_readb(info, AXP288_FG_TUNE3)); 272 seq_printf(s, "TUNING_CTL4[%02x] : %02x\n", 273 AXP288_FG_TUNE4, 274 fuel_gauge_reg_readb(info, AXP288_FG_TUNE4)); 275 seq_printf(s, "TUNING_CTL5[%02x] : %02x\n", 276 AXP288_FG_TUNE5, 277 fuel_gauge_reg_readb(info, AXP288_FG_TUNE5)); 278 279 ret = iio_read_channel_raw(info->iio_channel[BAT_TEMP], &raw_val); 280 if (ret >= 0) 281 seq_printf(s, "axp288-batttemp : %d\n", raw_val); 282 ret = iio_read_channel_raw(info->iio_channel[PMIC_TEMP], &raw_val); 283 if (ret >= 0) 284 seq_printf(s, "axp288-pmictemp : %d\n", raw_val); 285 ret = iio_read_channel_raw(info->iio_channel[SYSTEM_TEMP], &raw_val); 286 if (ret >= 0) 287 seq_printf(s, "axp288-systtemp : %d\n", raw_val); 288 ret = iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], &raw_val); 289 if (ret >= 0) 290 seq_printf(s, "axp288-chrgcurr : %d\n", raw_val); 291 ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &raw_val); 292 if (ret >= 0) 293 seq_printf(s, "axp288-dchrgcur : %d\n", raw_val); 294 ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val); 295 if (ret >= 0) 296 seq_printf(s, "axp288-battvolt : %d\n", raw_val); 297 298 return 0; 299 } 300 301 DEFINE_SHOW_ATTRIBUTE(fuel_gauge_debug); 302 303 static void fuel_gauge_create_debugfs(struct axp288_fg_info *info) 304 { 305 info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL, 306 info, &fuel_gauge_debug_fops); 307 } 308 309 static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info) 310 { 311 debugfs_remove(info->debug_file); 312 } 313 #else 314 static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info) 315 { 316 } 317 static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info) 318 { 319 } 320 #endif 321 322 static void fuel_gauge_get_status(struct axp288_fg_info *info) 323 { 324 int pwr_stat, fg_res, curr, ret; 325 326 pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS); 327 if (pwr_stat < 0) { 328 dev_err(&info->pdev->dev, 329 "PWR STAT read failed:%d\n", pwr_stat); 330 return; 331 } 332 333 /* Report full if Vbus is valid and the reported capacity is 100% */ 334 if (!(pwr_stat & PS_STAT_VBUS_VALID)) 335 goto not_full; 336 337 fg_res = fuel_gauge_reg_readb(info, AXP20X_FG_RES); 338 if (fg_res < 0) { 339 dev_err(&info->pdev->dev, "FG RES read failed: %d\n", fg_res); 340 return; 341 } 342 if (!(fg_res & FG_REP_CAP_VALID)) 343 goto not_full; 344 345 fg_res &= ~FG_REP_CAP_VALID; 346 if (fg_res == 100) { 347 info->status = POWER_SUPPLY_STATUS_FULL; 348 return; 349 } 350 351 /* 352 * Sometimes the charger turns itself off before fg-res reaches 100%. 353 * When this happens the AXP288 reports a not-charging status and 354 * 0 mA discharge current. 355 */ 356 if (fg_res < 90 || (pwr_stat & PS_STAT_BAT_CHRG_DIR)) 357 goto not_full; 358 359 ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &curr); 360 if (ret < 0) { 361 dev_err(&info->pdev->dev, "FG get current failed: %d\n", ret); 362 return; 363 } 364 if (curr == 0) { 365 info->status = POWER_SUPPLY_STATUS_FULL; 366 return; 367 } 368 369 not_full: 370 if (pwr_stat & PS_STAT_BAT_CHRG_DIR) 371 info->status = POWER_SUPPLY_STATUS_CHARGING; 372 else 373 info->status = POWER_SUPPLY_STATUS_DISCHARGING; 374 } 375 376 static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt) 377 { 378 int ret = 0, raw_val; 379 380 ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val); 381 if (ret < 0) 382 goto vbatt_read_fail; 383 384 *vbatt = VOLTAGE_FROM_ADC(raw_val); 385 vbatt_read_fail: 386 return ret; 387 } 388 389 static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur) 390 { 391 int ret, discharge; 392 393 /* First check discharge current, so that we do only 1 read on bat. */ 394 ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &discharge); 395 if (ret < 0) 396 return ret; 397 398 if (discharge > 0) { 399 *cur = -1 * discharge; 400 return 0; 401 } 402 403 return iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], cur); 404 } 405 406 static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv) 407 { 408 int ret; 409 410 ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG); 411 if (ret >= 0) 412 *vocv = VOLTAGE_FROM_ADC(ret); 413 414 return ret; 415 } 416 417 static int fuel_gauge_battery_health(struct axp288_fg_info *info) 418 { 419 int ret, vocv, health = POWER_SUPPLY_HEALTH_UNKNOWN; 420 421 ret = fuel_gauge_get_vocv(info, &vocv); 422 if (ret < 0) 423 goto health_read_fail; 424 425 if (vocv > info->max_volt) 426 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 427 else 428 health = POWER_SUPPLY_HEALTH_GOOD; 429 430 health_read_fail: 431 return health; 432 } 433 434 static int fuel_gauge_get_property(struct power_supply *ps, 435 enum power_supply_property prop, 436 union power_supply_propval *val) 437 { 438 struct axp288_fg_info *info = power_supply_get_drvdata(ps); 439 int ret = 0, value; 440 441 mutex_lock(&info->lock); 442 switch (prop) { 443 case POWER_SUPPLY_PROP_STATUS: 444 fuel_gauge_get_status(info); 445 val->intval = info->status; 446 break; 447 case POWER_SUPPLY_PROP_HEALTH: 448 val->intval = fuel_gauge_battery_health(info); 449 break; 450 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 451 ret = fuel_gauge_get_vbatt(info, &value); 452 if (ret < 0) 453 goto fuel_gauge_read_err; 454 val->intval = PROP_VOLT(value); 455 break; 456 case POWER_SUPPLY_PROP_VOLTAGE_OCV: 457 ret = fuel_gauge_get_vocv(info, &value); 458 if (ret < 0) 459 goto fuel_gauge_read_err; 460 val->intval = PROP_VOLT(value); 461 break; 462 case POWER_SUPPLY_PROP_CURRENT_NOW: 463 ret = fuel_gauge_get_current(info, &value); 464 if (ret < 0) 465 goto fuel_gauge_read_err; 466 val->intval = PROP_CURR(value); 467 break; 468 case POWER_SUPPLY_PROP_PRESENT: 469 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE); 470 if (ret < 0) 471 goto fuel_gauge_read_err; 472 473 if (ret & CHRG_STAT_BAT_PRESENT) 474 val->intval = 1; 475 else 476 val->intval = 0; 477 break; 478 case POWER_SUPPLY_PROP_CAPACITY: 479 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES); 480 if (ret < 0) 481 goto fuel_gauge_read_err; 482 483 if (!(ret & FG_REP_CAP_VALID)) 484 dev_err(&info->pdev->dev, 485 "capacity measurement not valid\n"); 486 val->intval = (ret & FG_REP_CAP_VAL_MASK); 487 break; 488 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: 489 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG); 490 if (ret < 0) 491 goto fuel_gauge_read_err; 492 val->intval = (ret & 0x0f); 493 break; 494 case POWER_SUPPLY_PROP_TECHNOLOGY: 495 val->intval = POWER_SUPPLY_TECHNOLOGY_LION; 496 break; 497 case POWER_SUPPLY_PROP_CHARGE_NOW: 498 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG); 499 if (ret < 0) 500 goto fuel_gauge_read_err; 501 502 val->intval = ret * FG_DES_CAP_RES_LSB; 503 break; 504 case POWER_SUPPLY_PROP_CHARGE_FULL: 505 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG); 506 if (ret < 0) 507 goto fuel_gauge_read_err; 508 509 val->intval = ret * FG_DES_CAP_RES_LSB; 510 break; 511 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 512 val->intval = PROP_VOLT(info->max_volt); 513 break; 514 default: 515 mutex_unlock(&info->lock); 516 return -EINVAL; 517 } 518 519 mutex_unlock(&info->lock); 520 return 0; 521 522 fuel_gauge_read_err: 523 mutex_unlock(&info->lock); 524 return ret; 525 } 526 527 static int fuel_gauge_set_property(struct power_supply *ps, 528 enum power_supply_property prop, 529 const union power_supply_propval *val) 530 { 531 struct axp288_fg_info *info = power_supply_get_drvdata(ps); 532 int ret = 0; 533 534 mutex_lock(&info->lock); 535 switch (prop) { 536 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: 537 if ((val->intval < 0) || (val->intval > 15)) { 538 ret = -EINVAL; 539 break; 540 } 541 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG); 542 if (ret < 0) 543 break; 544 ret &= 0xf0; 545 ret |= (val->intval & 0xf); 546 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret); 547 break; 548 default: 549 ret = -EINVAL; 550 break; 551 } 552 553 mutex_unlock(&info->lock); 554 return ret; 555 } 556 557 static int fuel_gauge_property_is_writeable(struct power_supply *psy, 558 enum power_supply_property psp) 559 { 560 int ret; 561 562 switch (psp) { 563 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: 564 ret = 1; 565 break; 566 default: 567 ret = 0; 568 } 569 570 return ret; 571 } 572 573 static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev) 574 { 575 struct axp288_fg_info *info = dev; 576 int i; 577 578 for (i = 0; i < AXP288_FG_INTR_NUM; i++) { 579 if (info->irq[i] == irq) 580 break; 581 } 582 583 if (i >= AXP288_FG_INTR_NUM) { 584 dev_warn(&info->pdev->dev, "spurious interrupt!!\n"); 585 return IRQ_NONE; 586 } 587 588 switch (i) { 589 case QWBTU_IRQ: 590 dev_info(&info->pdev->dev, 591 "Quit Battery under temperature in work mode IRQ (QWBTU)\n"); 592 break; 593 case WBTU_IRQ: 594 dev_info(&info->pdev->dev, 595 "Battery under temperature in work mode IRQ (WBTU)\n"); 596 break; 597 case QWBTO_IRQ: 598 dev_info(&info->pdev->dev, 599 "Quit Battery over temperature in work mode IRQ (QWBTO)\n"); 600 break; 601 case WBTO_IRQ: 602 dev_info(&info->pdev->dev, 603 "Battery over temperature in work mode IRQ (WBTO)\n"); 604 break; 605 case WL2_IRQ: 606 dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n"); 607 break; 608 case WL1_IRQ: 609 dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n"); 610 break; 611 default: 612 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n"); 613 } 614 615 power_supply_changed(info->bat); 616 return IRQ_HANDLED; 617 } 618 619 static void fuel_gauge_external_power_changed(struct power_supply *psy) 620 { 621 struct axp288_fg_info *info = power_supply_get_drvdata(psy); 622 623 power_supply_changed(info->bat); 624 } 625 626 static const struct power_supply_desc fuel_gauge_desc = { 627 .name = DEV_NAME, 628 .type = POWER_SUPPLY_TYPE_BATTERY, 629 .properties = fuel_gauge_props, 630 .num_properties = ARRAY_SIZE(fuel_gauge_props), 631 .get_property = fuel_gauge_get_property, 632 .set_property = fuel_gauge_set_property, 633 .property_is_writeable = fuel_gauge_property_is_writeable, 634 .external_power_changed = fuel_gauge_external_power_changed, 635 }; 636 637 static void fuel_gauge_init_irq(struct axp288_fg_info *info) 638 { 639 int ret, i, pirq; 640 641 for (i = 0; i < AXP288_FG_INTR_NUM; i++) { 642 pirq = platform_get_irq(info->pdev, i); 643 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq); 644 if (info->irq[i] < 0) { 645 dev_warn(&info->pdev->dev, 646 "regmap_irq get virq failed for IRQ %d: %d\n", 647 pirq, info->irq[i]); 648 info->irq[i] = -1; 649 goto intr_failed; 650 } 651 ret = request_threaded_irq(info->irq[i], 652 NULL, fuel_gauge_thread_handler, 653 IRQF_ONESHOT, DEV_NAME, info); 654 if (ret) { 655 dev_warn(&info->pdev->dev, 656 "request irq failed for IRQ %d: %d\n", 657 pirq, info->irq[i]); 658 info->irq[i] = -1; 659 goto intr_failed; 660 } else { 661 dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n", 662 pirq, info->irq[i]); 663 } 664 } 665 return; 666 667 intr_failed: 668 for (; i > 0; i--) { 669 free_irq(info->irq[i - 1], info); 670 info->irq[i - 1] = -1; 671 } 672 } 673 674 /* 675 * Some devices have no battery (HDMI sticks) and the axp288 battery's 676 * detection reports one despite it not being there. 677 * Please keep this listed sorted alphabetically. 678 */ 679 static const struct dmi_system_id axp288_fuel_gauge_blacklist[] = { 680 { 681 /* ACEPC T8 Cherry Trail Z8350 mini PC */ 682 .matches = { 683 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."), 684 DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"), 685 DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T8"), 686 /* also match on somewhat unique bios-version */ 687 DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"), 688 }, 689 }, 690 { 691 /* ACEPC T11 Cherry Trail Z8350 mini PC */ 692 .matches = { 693 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."), 694 DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"), 695 DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T11"), 696 /* also match on somewhat unique bios-version */ 697 DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"), 698 }, 699 }, 700 { 701 /* ECS EF20EA */ 702 .matches = { 703 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"), 704 }, 705 }, 706 { 707 /* Intel Cherry Trail Compute Stick, Windows version */ 708 .matches = { 709 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"), 710 DMI_MATCH(DMI_PRODUCT_NAME, "STK1AW32SC"), 711 }, 712 }, 713 { 714 /* Intel Cherry Trail Compute Stick, version without an OS */ 715 .matches = { 716 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"), 717 DMI_MATCH(DMI_PRODUCT_NAME, "STK1A32SC"), 718 }, 719 }, 720 { 721 /* Meegopad T08 */ 722 .matches = { 723 DMI_MATCH(DMI_SYS_VENDOR, "Default string"), 724 DMI_MATCH(DMI_BOARD_VENDOR, "To be filled by OEM."), 725 DMI_MATCH(DMI_BOARD_NAME, "T3 MRD"), 726 DMI_MATCH(DMI_BOARD_VERSION, "V1.1"), 727 }, 728 }, 729 { 730 /* Minix Neo Z83-4 mini PC */ 731 .matches = { 732 DMI_MATCH(DMI_SYS_VENDOR, "MINIX"), 733 DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"), 734 } 735 }, 736 {} 737 }; 738 739 static int axp288_fuel_gauge_probe(struct platform_device *pdev) 740 { 741 int i, ret = 0; 742 struct axp288_fg_info *info; 743 struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); 744 struct power_supply_config psy_cfg = {}; 745 static const char * const iio_chan_name[] = { 746 [BAT_TEMP] = "axp288-batt-temp", 747 [PMIC_TEMP] = "axp288-pmic-temp", 748 [SYSTEM_TEMP] = "axp288-system-temp", 749 [BAT_CHRG_CURR] = "axp288-chrg-curr", 750 [BAT_D_CURR] = "axp288-chrg-d-curr", 751 [BAT_VOLT] = "axp288-batt-volt", 752 }; 753 unsigned int val; 754 755 if (dmi_check_system(axp288_fuel_gauge_blacklist)) 756 return -ENODEV; 757 758 /* 759 * On some devices the fuelgauge and charger parts of the axp288 are 760 * not used, check that the fuelgauge is enabled (CC_CTRL != 0). 761 */ 762 ret = regmap_read(axp20x->regmap, AXP20X_CC_CTRL, &val); 763 if (ret < 0) 764 return ret; 765 if (val == 0) 766 return -ENODEV; 767 768 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 769 if (!info) 770 return -ENOMEM; 771 772 info->pdev = pdev; 773 info->regmap = axp20x->regmap; 774 info->regmap_irqc = axp20x->regmap_irqc; 775 info->status = POWER_SUPPLY_STATUS_UNKNOWN; 776 777 platform_set_drvdata(pdev, info); 778 779 mutex_init(&info->lock); 780 781 for (i = 0; i < IIO_CHANNEL_NUM; i++) { 782 /* 783 * Note cannot use devm_iio_channel_get because x86 systems 784 * lack the device<->channel maps which iio_channel_get will 785 * try to use when passed a non NULL device pointer. 786 */ 787 info->iio_channel[i] = 788 iio_channel_get(NULL, iio_chan_name[i]); 789 if (IS_ERR(info->iio_channel[i])) { 790 ret = PTR_ERR(info->iio_channel[i]); 791 dev_dbg(&pdev->dev, "error getting iiochan %s: %d\n", 792 iio_chan_name[i], ret); 793 /* Wait for axp288_adc to load */ 794 if (ret == -ENODEV) 795 ret = -EPROBE_DEFER; 796 797 goto out_free_iio_chan; 798 } 799 } 800 801 ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG); 802 if (ret < 0) 803 goto out_free_iio_chan; 804 805 if (!(ret & FG_DES_CAP1_VALID)) { 806 dev_err(&pdev->dev, "axp288 not configured by firmware\n"); 807 ret = -ENODEV; 808 goto out_free_iio_chan; 809 } 810 811 ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1); 812 if (ret < 0) 813 goto out_free_iio_chan; 814 switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) { 815 case CHRG_CCCV_CV_4100MV: 816 info->max_volt = 4100; 817 break; 818 case CHRG_CCCV_CV_4150MV: 819 info->max_volt = 4150; 820 break; 821 case CHRG_CCCV_CV_4200MV: 822 info->max_volt = 4200; 823 break; 824 case CHRG_CCCV_CV_4350MV: 825 info->max_volt = 4350; 826 break; 827 } 828 829 psy_cfg.drv_data = info; 830 info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg); 831 if (IS_ERR(info->bat)) { 832 ret = PTR_ERR(info->bat); 833 dev_err(&pdev->dev, "failed to register battery: %d\n", ret); 834 goto out_free_iio_chan; 835 } 836 837 fuel_gauge_create_debugfs(info); 838 fuel_gauge_init_irq(info); 839 840 return 0; 841 842 out_free_iio_chan: 843 for (i = 0; i < IIO_CHANNEL_NUM; i++) 844 if (!IS_ERR_OR_NULL(info->iio_channel[i])) 845 iio_channel_release(info->iio_channel[i]); 846 847 return ret; 848 } 849 850 static const struct platform_device_id axp288_fg_id_table[] = { 851 { .name = DEV_NAME }, 852 {}, 853 }; 854 MODULE_DEVICE_TABLE(platform, axp288_fg_id_table); 855 856 static int axp288_fuel_gauge_remove(struct platform_device *pdev) 857 { 858 struct axp288_fg_info *info = platform_get_drvdata(pdev); 859 int i; 860 861 power_supply_unregister(info->bat); 862 fuel_gauge_remove_debugfs(info); 863 864 for (i = 0; i < AXP288_FG_INTR_NUM; i++) 865 if (info->irq[i] >= 0) 866 free_irq(info->irq[i], info); 867 868 for (i = 0; i < IIO_CHANNEL_NUM; i++) 869 iio_channel_release(info->iio_channel[i]); 870 871 return 0; 872 } 873 874 static struct platform_driver axp288_fuel_gauge_driver = { 875 .probe = axp288_fuel_gauge_probe, 876 .remove = axp288_fuel_gauge_remove, 877 .id_table = axp288_fg_id_table, 878 .driver = { 879 .name = DEV_NAME, 880 }, 881 }; 882 883 module_platform_driver(axp288_fuel_gauge_driver); 884 885 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>"); 886 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>"); 887 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver"); 888 MODULE_LICENSE("GPL"); 889