1 /* 2 * axp288_fuel_gauge.c - Xpower AXP288 PMIC Fuel Gauge Driver 3 * 4 * Copyright (C) 2016-2017 Hans de Goede <hdegoede@redhat.com> 5 * Copyright (C) 2014 Intel Corporation 6 * 7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; version 2 of the License. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 */ 19 20 #include <linux/dmi.h> 21 #include <linux/module.h> 22 #include <linux/kernel.h> 23 #include <linux/device.h> 24 #include <linux/regmap.h> 25 #include <linux/jiffies.h> 26 #include <linux/interrupt.h> 27 #include <linux/mfd/axp20x.h> 28 #include <linux/platform_device.h> 29 #include <linux/power_supply.h> 30 #include <linux/iio/consumer.h> 31 #include <linux/debugfs.h> 32 #include <linux/seq_file.h> 33 #include <asm/unaligned.h> 34 35 #define PS_STAT_VBUS_TRIGGER (1 << 0) 36 #define PS_STAT_BAT_CHRG_DIR (1 << 2) 37 #define PS_STAT_VBAT_ABOVE_VHOLD (1 << 3) 38 #define PS_STAT_VBUS_VALID (1 << 4) 39 #define PS_STAT_VBUS_PRESENT (1 << 5) 40 41 #define CHRG_STAT_BAT_SAFE_MODE (1 << 3) 42 #define CHRG_STAT_BAT_VALID (1 << 4) 43 #define CHRG_STAT_BAT_PRESENT (1 << 5) 44 #define CHRG_STAT_CHARGING (1 << 6) 45 #define CHRG_STAT_PMIC_OTP (1 << 7) 46 47 #define CHRG_CCCV_CC_MASK 0xf /* 4 bits */ 48 #define CHRG_CCCV_CC_BIT_POS 0 49 #define CHRG_CCCV_CC_OFFSET 200 /* 200mA */ 50 #define CHRG_CCCV_CC_LSB_RES 200 /* 200mA */ 51 #define CHRG_CCCV_ITERM_20P (1 << 4) /* 20% of CC */ 52 #define CHRG_CCCV_CV_MASK 0x60 /* 2 bits */ 53 #define CHRG_CCCV_CV_BIT_POS 5 54 #define CHRG_CCCV_CV_4100MV 0x0 /* 4.10V */ 55 #define CHRG_CCCV_CV_4150MV 0x1 /* 4.15V */ 56 #define CHRG_CCCV_CV_4200MV 0x2 /* 4.20V */ 57 #define CHRG_CCCV_CV_4350MV 0x3 /* 4.35V */ 58 #define CHRG_CCCV_CHG_EN (1 << 7) 59 60 #define FG_CNTL_OCV_ADJ_STAT (1 << 2) 61 #define FG_CNTL_OCV_ADJ_EN (1 << 3) 62 #define FG_CNTL_CAP_ADJ_STAT (1 << 4) 63 #define FG_CNTL_CAP_ADJ_EN (1 << 5) 64 #define FG_CNTL_CC_EN (1 << 6) 65 #define FG_CNTL_GAUGE_EN (1 << 7) 66 67 #define FG_15BIT_WORD_VALID (1 << 15) 68 #define FG_15BIT_VAL_MASK 0x7fff 69 70 #define FG_REP_CAP_VALID (1 << 7) 71 #define FG_REP_CAP_VAL_MASK 0x7F 72 73 #define FG_DES_CAP1_VALID (1 << 7) 74 #define FG_DES_CAP_RES_LSB 1456 /* 1.456mAhr */ 75 76 #define FG_DES_CC_RES_LSB 1456 /* 1.456mAhr */ 77 78 #define FG_OCV_CAP_VALID (1 << 7) 79 #define FG_OCV_CAP_VAL_MASK 0x7F 80 #define FG_CC_CAP_VALID (1 << 7) 81 #define FG_CC_CAP_VAL_MASK 0x7F 82 83 #define FG_LOW_CAP_THR1_MASK 0xf0 /* 5% tp 20% */ 84 #define FG_LOW_CAP_THR1_VAL 0xa0 /* 15 perc */ 85 #define FG_LOW_CAP_THR2_MASK 0x0f /* 0% to 15% */ 86 #define FG_LOW_CAP_WARN_THR 14 /* 14 perc */ 87 #define FG_LOW_CAP_CRIT_THR 4 /* 4 perc */ 88 #define FG_LOW_CAP_SHDN_THR 0 /* 0 perc */ 89 90 #define NR_RETRY_CNT 3 91 #define DEV_NAME "axp288_fuel_gauge" 92 93 /* 1.1mV per LSB expressed in uV */ 94 #define VOLTAGE_FROM_ADC(a) ((a * 11) / 10) 95 /* properties converted to uV, uA */ 96 #define PROP_VOLT(a) ((a) * 1000) 97 #define PROP_CURR(a) ((a) * 1000) 98 99 #define AXP288_FG_INTR_NUM 6 100 enum { 101 QWBTU_IRQ = 0, 102 WBTU_IRQ, 103 QWBTO_IRQ, 104 WBTO_IRQ, 105 WL2_IRQ, 106 WL1_IRQ, 107 }; 108 109 enum { 110 BAT_TEMP = 0, 111 PMIC_TEMP, 112 SYSTEM_TEMP, 113 BAT_CHRG_CURR, 114 BAT_D_CURR, 115 BAT_VOLT, 116 IIO_CHANNEL_NUM 117 }; 118 119 struct axp288_fg_info { 120 struct platform_device *pdev; 121 struct regmap *regmap; 122 struct regmap_irq_chip_data *regmap_irqc; 123 int irq[AXP288_FG_INTR_NUM]; 124 struct iio_channel *iio_channel[IIO_CHANNEL_NUM]; 125 struct power_supply *bat; 126 struct mutex lock; 127 int status; 128 int max_volt; 129 struct dentry *debug_file; 130 }; 131 132 static enum power_supply_property fuel_gauge_props[] = { 133 POWER_SUPPLY_PROP_STATUS, 134 POWER_SUPPLY_PROP_PRESENT, 135 POWER_SUPPLY_PROP_HEALTH, 136 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 137 POWER_SUPPLY_PROP_VOLTAGE_NOW, 138 POWER_SUPPLY_PROP_VOLTAGE_OCV, 139 POWER_SUPPLY_PROP_CURRENT_NOW, 140 POWER_SUPPLY_PROP_CAPACITY, 141 POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN, 142 POWER_SUPPLY_PROP_TECHNOLOGY, 143 POWER_SUPPLY_PROP_CHARGE_FULL, 144 POWER_SUPPLY_PROP_CHARGE_NOW, 145 }; 146 147 static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg) 148 { 149 int ret, i; 150 unsigned int val; 151 152 for (i = 0; i < NR_RETRY_CNT; i++) { 153 ret = regmap_read(info->regmap, reg, &val); 154 if (ret == -EBUSY) 155 continue; 156 else 157 break; 158 } 159 160 if (ret < 0) { 161 dev_err(&info->pdev->dev, "axp288 reg read err:%d\n", ret); 162 return ret; 163 } 164 165 return val; 166 } 167 168 static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val) 169 { 170 int ret; 171 172 ret = regmap_write(info->regmap, reg, (unsigned int)val); 173 174 if (ret < 0) 175 dev_err(&info->pdev->dev, "axp288 reg write err:%d\n", ret); 176 177 return ret; 178 } 179 180 static int fuel_gauge_read_15bit_word(struct axp288_fg_info *info, int reg) 181 { 182 unsigned char buf[2]; 183 int ret; 184 185 ret = regmap_bulk_read(info->regmap, reg, buf, 2); 186 if (ret < 0) { 187 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n", 188 reg, ret); 189 return ret; 190 } 191 192 ret = get_unaligned_be16(buf); 193 if (!(ret & FG_15BIT_WORD_VALID)) { 194 dev_err(&info->pdev->dev, "Error reg 0x%02x contents not valid\n", 195 reg); 196 return -ENXIO; 197 } 198 199 return ret & FG_15BIT_VAL_MASK; 200 } 201 202 static int fuel_gauge_read_12bit_word(struct axp288_fg_info *info, int reg) 203 { 204 unsigned char buf[2]; 205 int ret; 206 207 ret = regmap_bulk_read(info->regmap, reg, buf, 2); 208 if (ret < 0) { 209 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n", 210 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 } 217 218 #ifdef CONFIG_DEBUG_FS 219 static int fuel_gauge_debug_show(struct seq_file *s, void *data) 220 { 221 struct axp288_fg_info *info = s->private; 222 int raw_val, ret; 223 224 seq_printf(s, " PWR_STATUS[%02x] : %02x\n", 225 AXP20X_PWR_INPUT_STATUS, 226 fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS)); 227 seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n", 228 AXP20X_PWR_OP_MODE, 229 fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE)); 230 seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n", 231 AXP20X_CHRG_CTRL1, 232 fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1)); 233 seq_printf(s, " VLTF[%02x] : %02x\n", 234 AXP20X_V_LTF_DISCHRG, 235 fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG)); 236 seq_printf(s, " VHTF[%02x] : %02x\n", 237 AXP20X_V_HTF_DISCHRG, 238 fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG)); 239 seq_printf(s, " CC_CTRL[%02x] : %02x\n", 240 AXP20X_CC_CTRL, 241 fuel_gauge_reg_readb(info, AXP20X_CC_CTRL)); 242 seq_printf(s, "BATTERY CAP[%02x] : %02x\n", 243 AXP20X_FG_RES, 244 fuel_gauge_reg_readb(info, AXP20X_FG_RES)); 245 seq_printf(s, " FG_RDC1[%02x] : %02x\n", 246 AXP288_FG_RDC1_REG, 247 fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG)); 248 seq_printf(s, " FG_RDC0[%02x] : %02x\n", 249 AXP288_FG_RDC0_REG, 250 fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG)); 251 seq_printf(s, " FG_OCV[%02x] : %04x\n", 252 AXP288_FG_OCVH_REG, 253 fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG)); 254 seq_printf(s, " FG_DES_CAP[%02x] : %04x\n", 255 AXP288_FG_DES_CAP1_REG, 256 fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG)); 257 seq_printf(s, " FG_CC_MTR[%02x] : %04x\n", 258 AXP288_FG_CC_MTR1_REG, 259 fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG)); 260 seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n", 261 AXP288_FG_OCV_CAP_REG, 262 fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG)); 263 seq_printf(s, " FG_CC_CAP[%02x] : %02x\n", 264 AXP288_FG_CC_CAP_REG, 265 fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG)); 266 seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n", 267 AXP288_FG_LOW_CAP_REG, 268 fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG)); 269 seq_printf(s, "TUNING_CTL0[%02x] : %02x\n", 270 AXP288_FG_TUNE0, 271 fuel_gauge_reg_readb(info, AXP288_FG_TUNE0)); 272 seq_printf(s, "TUNING_CTL1[%02x] : %02x\n", 273 AXP288_FG_TUNE1, 274 fuel_gauge_reg_readb(info, AXP288_FG_TUNE1)); 275 seq_printf(s, "TUNING_CTL2[%02x] : %02x\n", 276 AXP288_FG_TUNE2, 277 fuel_gauge_reg_readb(info, AXP288_FG_TUNE2)); 278 seq_printf(s, "TUNING_CTL3[%02x] : %02x\n", 279 AXP288_FG_TUNE3, 280 fuel_gauge_reg_readb(info, AXP288_FG_TUNE3)); 281 seq_printf(s, "TUNING_CTL4[%02x] : %02x\n", 282 AXP288_FG_TUNE4, 283 fuel_gauge_reg_readb(info, AXP288_FG_TUNE4)); 284 seq_printf(s, "TUNING_CTL5[%02x] : %02x\n", 285 AXP288_FG_TUNE5, 286 fuel_gauge_reg_readb(info, AXP288_FG_TUNE5)); 287 288 ret = iio_read_channel_raw(info->iio_channel[BAT_TEMP], &raw_val); 289 if (ret >= 0) 290 seq_printf(s, "axp288-batttemp : %d\n", raw_val); 291 ret = iio_read_channel_raw(info->iio_channel[PMIC_TEMP], &raw_val); 292 if (ret >= 0) 293 seq_printf(s, "axp288-pmictemp : %d\n", raw_val); 294 ret = iio_read_channel_raw(info->iio_channel[SYSTEM_TEMP], &raw_val); 295 if (ret >= 0) 296 seq_printf(s, "axp288-systtemp : %d\n", raw_val); 297 ret = iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], &raw_val); 298 if (ret >= 0) 299 seq_printf(s, "axp288-chrgcurr : %d\n", raw_val); 300 ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &raw_val); 301 if (ret >= 0) 302 seq_printf(s, "axp288-dchrgcur : %d\n", raw_val); 303 ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val); 304 if (ret >= 0) 305 seq_printf(s, "axp288-battvolt : %d\n", raw_val); 306 307 return 0; 308 } 309 310 DEFINE_SHOW_ATTRIBUTE(fuel_gauge_debug); 311 312 static void fuel_gauge_create_debugfs(struct axp288_fg_info *info) 313 { 314 info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL, 315 info, &fuel_gauge_debug_fops); 316 } 317 318 static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info) 319 { 320 debugfs_remove(info->debug_file); 321 } 322 #else 323 static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info) 324 { 325 } 326 static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info) 327 { 328 } 329 #endif 330 331 static void fuel_gauge_get_status(struct axp288_fg_info *info) 332 { 333 int pwr_stat, fg_res, curr, ret; 334 335 pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS); 336 if (pwr_stat < 0) { 337 dev_err(&info->pdev->dev, 338 "PWR STAT read failed:%d\n", pwr_stat); 339 return; 340 } 341 342 /* Report full if Vbus is valid and the reported capacity is 100% */ 343 if (!(pwr_stat & PS_STAT_VBUS_VALID)) 344 goto not_full; 345 346 fg_res = fuel_gauge_reg_readb(info, AXP20X_FG_RES); 347 if (fg_res < 0) { 348 dev_err(&info->pdev->dev, "FG RES read failed: %d\n", fg_res); 349 return; 350 } 351 if (!(fg_res & FG_REP_CAP_VALID)) 352 goto not_full; 353 354 fg_res &= ~FG_REP_CAP_VALID; 355 if (fg_res == 100) { 356 info->status = POWER_SUPPLY_STATUS_FULL; 357 return; 358 } 359 360 /* 361 * Sometimes the charger turns itself off before fg-res reaches 100%. 362 * When this happens the AXP288 reports a not-charging status and 363 * 0 mA discharge current. 364 */ 365 if (fg_res < 90 || (pwr_stat & PS_STAT_BAT_CHRG_DIR)) 366 goto not_full; 367 368 ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &curr); 369 if (ret < 0) { 370 dev_err(&info->pdev->dev, "FG get current failed: %d\n", ret); 371 return; 372 } 373 if (curr == 0) { 374 info->status = POWER_SUPPLY_STATUS_FULL; 375 return; 376 } 377 378 not_full: 379 if (pwr_stat & PS_STAT_BAT_CHRG_DIR) 380 info->status = POWER_SUPPLY_STATUS_CHARGING; 381 else 382 info->status = POWER_SUPPLY_STATUS_DISCHARGING; 383 } 384 385 static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt) 386 { 387 int ret = 0, raw_val; 388 389 ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val); 390 if (ret < 0) 391 goto vbatt_read_fail; 392 393 *vbatt = VOLTAGE_FROM_ADC(raw_val); 394 vbatt_read_fail: 395 return ret; 396 } 397 398 static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur) 399 { 400 int ret, discharge; 401 402 /* First check discharge current, so that we do only 1 read on bat. */ 403 ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &discharge); 404 if (ret < 0) 405 return ret; 406 407 if (discharge > 0) { 408 *cur = -1 * discharge; 409 return 0; 410 } 411 412 return iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], cur); 413 } 414 415 static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv) 416 { 417 int ret; 418 419 ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG); 420 if (ret >= 0) 421 *vocv = VOLTAGE_FROM_ADC(ret); 422 423 return ret; 424 } 425 426 static int fuel_gauge_battery_health(struct axp288_fg_info *info) 427 { 428 int ret, vocv, health = POWER_SUPPLY_HEALTH_UNKNOWN; 429 430 ret = fuel_gauge_get_vocv(info, &vocv); 431 if (ret < 0) 432 goto health_read_fail; 433 434 if (vocv > info->max_volt) 435 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 436 else 437 health = POWER_SUPPLY_HEALTH_GOOD; 438 439 health_read_fail: 440 return health; 441 } 442 443 static int fuel_gauge_get_property(struct power_supply *ps, 444 enum power_supply_property prop, 445 union power_supply_propval *val) 446 { 447 struct axp288_fg_info *info = power_supply_get_drvdata(ps); 448 int ret = 0, value; 449 450 mutex_lock(&info->lock); 451 switch (prop) { 452 case POWER_SUPPLY_PROP_STATUS: 453 fuel_gauge_get_status(info); 454 val->intval = info->status; 455 break; 456 case POWER_SUPPLY_PROP_HEALTH: 457 val->intval = fuel_gauge_battery_health(info); 458 break; 459 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 460 ret = fuel_gauge_get_vbatt(info, &value); 461 if (ret < 0) 462 goto fuel_gauge_read_err; 463 val->intval = PROP_VOLT(value); 464 break; 465 case POWER_SUPPLY_PROP_VOLTAGE_OCV: 466 ret = fuel_gauge_get_vocv(info, &value); 467 if (ret < 0) 468 goto fuel_gauge_read_err; 469 val->intval = PROP_VOLT(value); 470 break; 471 case POWER_SUPPLY_PROP_CURRENT_NOW: 472 ret = fuel_gauge_get_current(info, &value); 473 if (ret < 0) 474 goto fuel_gauge_read_err; 475 val->intval = PROP_CURR(value); 476 break; 477 case POWER_SUPPLY_PROP_PRESENT: 478 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE); 479 if (ret < 0) 480 goto fuel_gauge_read_err; 481 482 if (ret & CHRG_STAT_BAT_PRESENT) 483 val->intval = 1; 484 else 485 val->intval = 0; 486 break; 487 case POWER_SUPPLY_PROP_CAPACITY: 488 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES); 489 if (ret < 0) 490 goto fuel_gauge_read_err; 491 492 if (!(ret & FG_REP_CAP_VALID)) 493 dev_err(&info->pdev->dev, 494 "capacity measurement not valid\n"); 495 val->intval = (ret & FG_REP_CAP_VAL_MASK); 496 break; 497 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: 498 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG); 499 if (ret < 0) 500 goto fuel_gauge_read_err; 501 val->intval = (ret & 0x0f); 502 break; 503 case POWER_SUPPLY_PROP_TECHNOLOGY: 504 val->intval = POWER_SUPPLY_TECHNOLOGY_LION; 505 break; 506 case POWER_SUPPLY_PROP_CHARGE_NOW: 507 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG); 508 if (ret < 0) 509 goto fuel_gauge_read_err; 510 511 val->intval = ret * FG_DES_CAP_RES_LSB; 512 break; 513 case POWER_SUPPLY_PROP_CHARGE_FULL: 514 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG); 515 if (ret < 0) 516 goto fuel_gauge_read_err; 517 518 val->intval = ret * FG_DES_CAP_RES_LSB; 519 break; 520 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 521 val->intval = PROP_VOLT(info->max_volt); 522 break; 523 default: 524 mutex_unlock(&info->lock); 525 return -EINVAL; 526 } 527 528 mutex_unlock(&info->lock); 529 return 0; 530 531 fuel_gauge_read_err: 532 mutex_unlock(&info->lock); 533 return ret; 534 } 535 536 static int fuel_gauge_set_property(struct power_supply *ps, 537 enum power_supply_property prop, 538 const union power_supply_propval *val) 539 { 540 struct axp288_fg_info *info = power_supply_get_drvdata(ps); 541 int ret = 0; 542 543 mutex_lock(&info->lock); 544 switch (prop) { 545 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: 546 if ((val->intval < 0) || (val->intval > 15)) { 547 ret = -EINVAL; 548 break; 549 } 550 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG); 551 if (ret < 0) 552 break; 553 ret &= 0xf0; 554 ret |= (val->intval & 0xf); 555 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret); 556 break; 557 default: 558 ret = -EINVAL; 559 break; 560 } 561 562 mutex_unlock(&info->lock); 563 return ret; 564 } 565 566 static int fuel_gauge_property_is_writeable(struct power_supply *psy, 567 enum power_supply_property psp) 568 { 569 int ret; 570 571 switch (psp) { 572 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: 573 ret = 1; 574 break; 575 default: 576 ret = 0; 577 } 578 579 return ret; 580 } 581 582 static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev) 583 { 584 struct axp288_fg_info *info = dev; 585 int i; 586 587 for (i = 0; i < AXP288_FG_INTR_NUM; i++) { 588 if (info->irq[i] == irq) 589 break; 590 } 591 592 if (i >= AXP288_FG_INTR_NUM) { 593 dev_warn(&info->pdev->dev, "spurious interrupt!!\n"); 594 return IRQ_NONE; 595 } 596 597 switch (i) { 598 case QWBTU_IRQ: 599 dev_info(&info->pdev->dev, 600 "Quit Battery under temperature in work mode IRQ (QWBTU)\n"); 601 break; 602 case WBTU_IRQ: 603 dev_info(&info->pdev->dev, 604 "Battery under temperature in work mode IRQ (WBTU)\n"); 605 break; 606 case QWBTO_IRQ: 607 dev_info(&info->pdev->dev, 608 "Quit Battery over temperature in work mode IRQ (QWBTO)\n"); 609 break; 610 case WBTO_IRQ: 611 dev_info(&info->pdev->dev, 612 "Battery over temperature in work mode IRQ (WBTO)\n"); 613 break; 614 case WL2_IRQ: 615 dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n"); 616 break; 617 case WL1_IRQ: 618 dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n"); 619 break; 620 default: 621 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n"); 622 } 623 624 power_supply_changed(info->bat); 625 return IRQ_HANDLED; 626 } 627 628 static void fuel_gauge_external_power_changed(struct power_supply *psy) 629 { 630 struct axp288_fg_info *info = power_supply_get_drvdata(psy); 631 632 power_supply_changed(info->bat); 633 } 634 635 static const struct power_supply_desc fuel_gauge_desc = { 636 .name = DEV_NAME, 637 .type = POWER_SUPPLY_TYPE_BATTERY, 638 .properties = fuel_gauge_props, 639 .num_properties = ARRAY_SIZE(fuel_gauge_props), 640 .get_property = fuel_gauge_get_property, 641 .set_property = fuel_gauge_set_property, 642 .property_is_writeable = fuel_gauge_property_is_writeable, 643 .external_power_changed = fuel_gauge_external_power_changed, 644 }; 645 646 static void fuel_gauge_init_irq(struct axp288_fg_info *info) 647 { 648 int ret, i, pirq; 649 650 for (i = 0; i < AXP288_FG_INTR_NUM; i++) { 651 pirq = platform_get_irq(info->pdev, i); 652 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq); 653 if (info->irq[i] < 0) { 654 dev_warn(&info->pdev->dev, 655 "regmap_irq get virq failed for IRQ %d: %d\n", 656 pirq, info->irq[i]); 657 info->irq[i] = -1; 658 goto intr_failed; 659 } 660 ret = request_threaded_irq(info->irq[i], 661 NULL, fuel_gauge_thread_handler, 662 IRQF_ONESHOT, DEV_NAME, info); 663 if (ret) { 664 dev_warn(&info->pdev->dev, 665 "request irq failed for IRQ %d: %d\n", 666 pirq, info->irq[i]); 667 info->irq[i] = -1; 668 goto intr_failed; 669 } else { 670 dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n", 671 pirq, info->irq[i]); 672 } 673 } 674 return; 675 676 intr_failed: 677 for (; i > 0; i--) { 678 free_irq(info->irq[i - 1], info); 679 info->irq[i - 1] = -1; 680 } 681 } 682 683 /* 684 * Some devices have no battery (HDMI sticks) and the axp288 battery's 685 * detection reports one despite it not being there. 686 */ 687 static const struct dmi_system_id axp288_fuel_gauge_blacklist[] = { 688 { 689 /* Intel Cherry Trail Compute Stick, Windows version */ 690 .matches = { 691 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"), 692 DMI_MATCH(DMI_PRODUCT_NAME, "STK1AW32SC"), 693 }, 694 }, 695 { 696 /* Intel Cherry Trail Compute Stick, version without an OS */ 697 .matches = { 698 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"), 699 DMI_MATCH(DMI_PRODUCT_NAME, "STK1A32SC"), 700 }, 701 }, 702 { 703 /* Meegopad T08 */ 704 .matches = { 705 DMI_MATCH(DMI_SYS_VENDOR, "Default string"), 706 DMI_MATCH(DMI_BOARD_VENDOR, "To be filled by OEM."), 707 DMI_MATCH(DMI_BOARD_NAME, "T3 MRD"), 708 DMI_MATCH(DMI_BOARD_VERSION, "V1.1"), 709 }, 710 }, 711 { 712 /* ECS EF20EA */ 713 .matches = { 714 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"), 715 }, 716 }, 717 {} 718 }; 719 720 static int axp288_fuel_gauge_probe(struct platform_device *pdev) 721 { 722 int i, ret = 0; 723 struct axp288_fg_info *info; 724 struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); 725 struct power_supply_config psy_cfg = {}; 726 static const char * const iio_chan_name[] = { 727 [BAT_TEMP] = "axp288-batt-temp", 728 [PMIC_TEMP] = "axp288-pmic-temp", 729 [SYSTEM_TEMP] = "axp288-system-temp", 730 [BAT_CHRG_CURR] = "axp288-chrg-curr", 731 [BAT_D_CURR] = "axp288-chrg-d-curr", 732 [BAT_VOLT] = "axp288-batt-volt", 733 }; 734 unsigned int val; 735 736 if (dmi_check_system(axp288_fuel_gauge_blacklist)) 737 return -ENODEV; 738 739 /* 740 * On some devices the fuelgauge and charger parts of the axp288 are 741 * not used, check that the fuelgauge is enabled (CC_CTRL != 0). 742 */ 743 ret = regmap_read(axp20x->regmap, AXP20X_CC_CTRL, &val); 744 if (ret < 0) 745 return ret; 746 if (val == 0) 747 return -ENODEV; 748 749 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 750 if (!info) 751 return -ENOMEM; 752 753 info->pdev = pdev; 754 info->regmap = axp20x->regmap; 755 info->regmap_irqc = axp20x->regmap_irqc; 756 info->status = POWER_SUPPLY_STATUS_UNKNOWN; 757 758 platform_set_drvdata(pdev, info); 759 760 mutex_init(&info->lock); 761 762 for (i = 0; i < IIO_CHANNEL_NUM; i++) { 763 /* 764 * Note cannot use devm_iio_channel_get because x86 systems 765 * lack the device<->channel maps which iio_channel_get will 766 * try to use when passed a non NULL device pointer. 767 */ 768 info->iio_channel[i] = 769 iio_channel_get(NULL, iio_chan_name[i]); 770 if (IS_ERR(info->iio_channel[i])) { 771 ret = PTR_ERR(info->iio_channel[i]); 772 dev_dbg(&pdev->dev, "error getting iiochan %s: %d\n", 773 iio_chan_name[i], ret); 774 /* Wait for axp288_adc to load */ 775 if (ret == -ENODEV) 776 ret = -EPROBE_DEFER; 777 778 goto out_free_iio_chan; 779 } 780 } 781 782 ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG); 783 if (ret < 0) 784 goto out_free_iio_chan; 785 786 if (!(ret & FG_DES_CAP1_VALID)) { 787 dev_err(&pdev->dev, "axp288 not configured by firmware\n"); 788 ret = -ENODEV; 789 goto out_free_iio_chan; 790 } 791 792 ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1); 793 if (ret < 0) 794 goto out_free_iio_chan; 795 switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) { 796 case CHRG_CCCV_CV_4100MV: 797 info->max_volt = 4100; 798 break; 799 case CHRG_CCCV_CV_4150MV: 800 info->max_volt = 4150; 801 break; 802 case CHRG_CCCV_CV_4200MV: 803 info->max_volt = 4200; 804 break; 805 case CHRG_CCCV_CV_4350MV: 806 info->max_volt = 4350; 807 break; 808 } 809 810 psy_cfg.drv_data = info; 811 info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg); 812 if (IS_ERR(info->bat)) { 813 ret = PTR_ERR(info->bat); 814 dev_err(&pdev->dev, "failed to register battery: %d\n", ret); 815 goto out_free_iio_chan; 816 } 817 818 fuel_gauge_create_debugfs(info); 819 fuel_gauge_init_irq(info); 820 821 return 0; 822 823 out_free_iio_chan: 824 for (i = 0; i < IIO_CHANNEL_NUM; i++) 825 if (!IS_ERR_OR_NULL(info->iio_channel[i])) 826 iio_channel_release(info->iio_channel[i]); 827 828 return ret; 829 } 830 831 static const struct platform_device_id axp288_fg_id_table[] = { 832 { .name = DEV_NAME }, 833 {}, 834 }; 835 MODULE_DEVICE_TABLE(platform, axp288_fg_id_table); 836 837 static int axp288_fuel_gauge_remove(struct platform_device *pdev) 838 { 839 struct axp288_fg_info *info = platform_get_drvdata(pdev); 840 int i; 841 842 power_supply_unregister(info->bat); 843 fuel_gauge_remove_debugfs(info); 844 845 for (i = 0; i < AXP288_FG_INTR_NUM; i++) 846 if (info->irq[i] >= 0) 847 free_irq(info->irq[i], info); 848 849 for (i = 0; i < IIO_CHANNEL_NUM; i++) 850 iio_channel_release(info->iio_channel[i]); 851 852 return 0; 853 } 854 855 static struct platform_driver axp288_fuel_gauge_driver = { 856 .probe = axp288_fuel_gauge_probe, 857 .remove = axp288_fuel_gauge_remove, 858 .id_table = axp288_fg_id_table, 859 .driver = { 860 .name = DEV_NAME, 861 }, 862 }; 863 864 module_platform_driver(axp288_fuel_gauge_driver); 865 866 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>"); 867 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>"); 868 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver"); 869 MODULE_LICENSE("GPL"); 870