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/workqueue.h> 28 #include <linux/mfd/axp20x.h> 29 #include <linux/platform_device.h> 30 #include <linux/power_supply.h> 31 #include <linux/iio/consumer.h> 32 #include <linux/debugfs.h> 33 #include <linux/seq_file.h> 34 #include <asm/unaligned.h> 35 36 #define PS_STAT_VBUS_TRIGGER (1 << 0) 37 #define PS_STAT_BAT_CHRG_DIR (1 << 2) 38 #define PS_STAT_VBAT_ABOVE_VHOLD (1 << 3) 39 #define PS_STAT_VBUS_VALID (1 << 4) 40 #define PS_STAT_VBUS_PRESENT (1 << 5) 41 42 #define CHRG_STAT_BAT_SAFE_MODE (1 << 3) 43 #define CHRG_STAT_BAT_VALID (1 << 4) 44 #define CHRG_STAT_BAT_PRESENT (1 << 5) 45 #define CHRG_STAT_CHARGING (1 << 6) 46 #define CHRG_STAT_PMIC_OTP (1 << 7) 47 48 #define CHRG_CCCV_CC_MASK 0xf /* 4 bits */ 49 #define CHRG_CCCV_CC_BIT_POS 0 50 #define CHRG_CCCV_CC_OFFSET 200 /* 200mA */ 51 #define CHRG_CCCV_CC_LSB_RES 200 /* 200mA */ 52 #define CHRG_CCCV_ITERM_20P (1 << 4) /* 20% of CC */ 53 #define CHRG_CCCV_CV_MASK 0x60 /* 2 bits */ 54 #define CHRG_CCCV_CV_BIT_POS 5 55 #define CHRG_CCCV_CV_4100MV 0x0 /* 4.10V */ 56 #define CHRG_CCCV_CV_4150MV 0x1 /* 4.15V */ 57 #define CHRG_CCCV_CV_4200MV 0x2 /* 4.20V */ 58 #define CHRG_CCCV_CV_4350MV 0x3 /* 4.35V */ 59 #define CHRG_CCCV_CHG_EN (1 << 7) 60 61 #define FG_CNTL_OCV_ADJ_STAT (1 << 2) 62 #define FG_CNTL_OCV_ADJ_EN (1 << 3) 63 #define FG_CNTL_CAP_ADJ_STAT (1 << 4) 64 #define FG_CNTL_CAP_ADJ_EN (1 << 5) 65 #define FG_CNTL_CC_EN (1 << 6) 66 #define FG_CNTL_GAUGE_EN (1 << 7) 67 68 #define FG_15BIT_WORD_VALID (1 << 15) 69 #define FG_15BIT_VAL_MASK 0x7fff 70 71 #define FG_REP_CAP_VALID (1 << 7) 72 #define FG_REP_CAP_VAL_MASK 0x7F 73 74 #define FG_DES_CAP1_VALID (1 << 7) 75 #define FG_DES_CAP_RES_LSB 1456 /* 1.456mAhr */ 76 77 #define FG_DES_CC_RES_LSB 1456 /* 1.456mAhr */ 78 79 #define FG_OCV_CAP_VALID (1 << 7) 80 #define FG_OCV_CAP_VAL_MASK 0x7F 81 #define FG_CC_CAP_VALID (1 << 7) 82 #define FG_CC_CAP_VAL_MASK 0x7F 83 84 #define FG_LOW_CAP_THR1_MASK 0xf0 /* 5% tp 20% */ 85 #define FG_LOW_CAP_THR1_VAL 0xa0 /* 15 perc */ 86 #define FG_LOW_CAP_THR2_MASK 0x0f /* 0% to 15% */ 87 #define FG_LOW_CAP_WARN_THR 14 /* 14 perc */ 88 #define FG_LOW_CAP_CRIT_THR 4 /* 4 perc */ 89 #define FG_LOW_CAP_SHDN_THR 0 /* 0 perc */ 90 91 #define STATUS_MON_DELAY_JIFFIES (HZ * 60) /*60 sec */ 92 #define NR_RETRY_CNT 3 93 #define DEV_NAME "axp288_fuel_gauge" 94 95 /* 1.1mV per LSB expressed in uV */ 96 #define VOLTAGE_FROM_ADC(a) ((a * 11) / 10) 97 /* properties converted to uV, uA */ 98 #define PROP_VOLT(a) ((a) * 1000) 99 #define PROP_CURR(a) ((a) * 1000) 100 101 #define AXP288_FG_INTR_NUM 6 102 enum { 103 QWBTU_IRQ = 0, 104 WBTU_IRQ, 105 QWBTO_IRQ, 106 WBTO_IRQ, 107 WL2_IRQ, 108 WL1_IRQ, 109 }; 110 111 enum { 112 BAT_TEMP = 0, 113 PMIC_TEMP, 114 SYSTEM_TEMP, 115 BAT_CHRG_CURR, 116 BAT_D_CURR, 117 BAT_VOLT, 118 IIO_CHANNEL_NUM 119 }; 120 121 struct axp288_fg_info { 122 struct platform_device *pdev; 123 struct regmap *regmap; 124 struct regmap_irq_chip_data *regmap_irqc; 125 int irq[AXP288_FG_INTR_NUM]; 126 struct iio_channel *iio_channel[IIO_CHANNEL_NUM]; 127 struct power_supply *bat; 128 struct mutex lock; 129 int status; 130 int max_volt; 131 struct delayed_work status_monitor; 132 struct dentry *debug_file; 133 }; 134 135 static enum power_supply_property fuel_gauge_props[] = { 136 POWER_SUPPLY_PROP_STATUS, 137 POWER_SUPPLY_PROP_PRESENT, 138 POWER_SUPPLY_PROP_HEALTH, 139 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 140 POWER_SUPPLY_PROP_VOLTAGE_NOW, 141 POWER_SUPPLY_PROP_VOLTAGE_OCV, 142 POWER_SUPPLY_PROP_CURRENT_NOW, 143 POWER_SUPPLY_PROP_CAPACITY, 144 POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN, 145 POWER_SUPPLY_PROP_TECHNOLOGY, 146 POWER_SUPPLY_PROP_CHARGE_FULL, 147 POWER_SUPPLY_PROP_CHARGE_NOW, 148 }; 149 150 static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg) 151 { 152 int ret, i; 153 unsigned int val; 154 155 for (i = 0; i < NR_RETRY_CNT; i++) { 156 ret = regmap_read(info->regmap, reg, &val); 157 if (ret == -EBUSY) 158 continue; 159 else 160 break; 161 } 162 163 if (ret < 0) { 164 dev_err(&info->pdev->dev, "axp288 reg read err:%d\n", ret); 165 return ret; 166 } 167 168 return val; 169 } 170 171 static 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->pdev->dev, "axp288 reg write err:%d\n", ret); 179 180 return ret; 181 } 182 183 static 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->pdev->dev, "Error reading reg 0x%02x err: %d\n", 191 reg, ret); 192 return ret; 193 } 194 195 ret = get_unaligned_be16(buf); 196 if (!(ret & FG_15BIT_WORD_VALID)) { 197 dev_err(&info->pdev->dev, "Error reg 0x%02x contents not valid\n", 198 reg); 199 return -ENXIO; 200 } 201 202 return ret & FG_15BIT_VAL_MASK; 203 } 204 205 static int fuel_gauge_read_12bit_word(struct axp288_fg_info *info, int reg) 206 { 207 unsigned char buf[2]; 208 int ret; 209 210 ret = regmap_bulk_read(info->regmap, reg, buf, 2); 211 if (ret < 0) { 212 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n", 213 reg, ret); 214 return ret; 215 } 216 217 /* 12-bit data values have upper 8 bits in buf[0], lower 4 in buf[1] */ 218 return (buf[0] << 4) | ((buf[1] >> 4) & 0x0f); 219 } 220 221 #ifdef CONFIG_DEBUG_FS 222 static int fuel_gauge_debug_show(struct seq_file *s, void *data) 223 { 224 struct axp288_fg_info *info = s->private; 225 int raw_val, ret; 226 227 seq_printf(s, " PWR_STATUS[%02x] : %02x\n", 228 AXP20X_PWR_INPUT_STATUS, 229 fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS)); 230 seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n", 231 AXP20X_PWR_OP_MODE, 232 fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE)); 233 seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n", 234 AXP20X_CHRG_CTRL1, 235 fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1)); 236 seq_printf(s, " VLTF[%02x] : %02x\n", 237 AXP20X_V_LTF_DISCHRG, 238 fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG)); 239 seq_printf(s, " VHTF[%02x] : %02x\n", 240 AXP20X_V_HTF_DISCHRG, 241 fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG)); 242 seq_printf(s, " CC_CTRL[%02x] : %02x\n", 243 AXP20X_CC_CTRL, 244 fuel_gauge_reg_readb(info, AXP20X_CC_CTRL)); 245 seq_printf(s, "BATTERY CAP[%02x] : %02x\n", 246 AXP20X_FG_RES, 247 fuel_gauge_reg_readb(info, AXP20X_FG_RES)); 248 seq_printf(s, " FG_RDC1[%02x] : %02x\n", 249 AXP288_FG_RDC1_REG, 250 fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG)); 251 seq_printf(s, " FG_RDC0[%02x] : %02x\n", 252 AXP288_FG_RDC0_REG, 253 fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG)); 254 seq_printf(s, " FG_OCV[%02x] : %04x\n", 255 AXP288_FG_OCVH_REG, 256 fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG)); 257 seq_printf(s, " FG_DES_CAP[%02x] : %04x\n", 258 AXP288_FG_DES_CAP1_REG, 259 fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG)); 260 seq_printf(s, " FG_CC_MTR[%02x] : %04x\n", 261 AXP288_FG_CC_MTR1_REG, 262 fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG)); 263 seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n", 264 AXP288_FG_OCV_CAP_REG, 265 fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG)); 266 seq_printf(s, " FG_CC_CAP[%02x] : %02x\n", 267 AXP288_FG_CC_CAP_REG, 268 fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG)); 269 seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n", 270 AXP288_FG_LOW_CAP_REG, 271 fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG)); 272 seq_printf(s, "TUNING_CTL0[%02x] : %02x\n", 273 AXP288_FG_TUNE0, 274 fuel_gauge_reg_readb(info, AXP288_FG_TUNE0)); 275 seq_printf(s, "TUNING_CTL1[%02x] : %02x\n", 276 AXP288_FG_TUNE1, 277 fuel_gauge_reg_readb(info, AXP288_FG_TUNE1)); 278 seq_printf(s, "TUNING_CTL2[%02x] : %02x\n", 279 AXP288_FG_TUNE2, 280 fuel_gauge_reg_readb(info, AXP288_FG_TUNE2)); 281 seq_printf(s, "TUNING_CTL3[%02x] : %02x\n", 282 AXP288_FG_TUNE3, 283 fuel_gauge_reg_readb(info, AXP288_FG_TUNE3)); 284 seq_printf(s, "TUNING_CTL4[%02x] : %02x\n", 285 AXP288_FG_TUNE4, 286 fuel_gauge_reg_readb(info, AXP288_FG_TUNE4)); 287 seq_printf(s, "TUNING_CTL5[%02x] : %02x\n", 288 AXP288_FG_TUNE5, 289 fuel_gauge_reg_readb(info, AXP288_FG_TUNE5)); 290 291 ret = iio_read_channel_raw(info->iio_channel[BAT_TEMP], &raw_val); 292 if (ret >= 0) 293 seq_printf(s, "axp288-batttemp : %d\n", raw_val); 294 ret = iio_read_channel_raw(info->iio_channel[PMIC_TEMP], &raw_val); 295 if (ret >= 0) 296 seq_printf(s, "axp288-pmictemp : %d\n", raw_val); 297 ret = iio_read_channel_raw(info->iio_channel[SYSTEM_TEMP], &raw_val); 298 if (ret >= 0) 299 seq_printf(s, "axp288-systtemp : %d\n", raw_val); 300 ret = iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], &raw_val); 301 if (ret >= 0) 302 seq_printf(s, "axp288-chrgcurr : %d\n", raw_val); 303 ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &raw_val); 304 if (ret >= 0) 305 seq_printf(s, "axp288-dchrgcur : %d\n", raw_val); 306 ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val); 307 if (ret >= 0) 308 seq_printf(s, "axp288-battvolt : %d\n", raw_val); 309 310 return 0; 311 } 312 313 static int debug_open(struct inode *inode, struct file *file) 314 { 315 return single_open(file, fuel_gauge_debug_show, inode->i_private); 316 } 317 318 static const struct file_operations fg_debug_fops = { 319 .open = debug_open, 320 .read = seq_read, 321 .llseek = seq_lseek, 322 .release = single_release, 323 }; 324 325 static void fuel_gauge_create_debugfs(struct axp288_fg_info *info) 326 { 327 info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL, 328 info, &fg_debug_fops); 329 } 330 331 static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info) 332 { 333 debugfs_remove(info->debug_file); 334 } 335 #else 336 static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info) 337 { 338 } 339 static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info) 340 { 341 } 342 #endif 343 344 static void fuel_gauge_get_status(struct axp288_fg_info *info) 345 { 346 int pwr_stat, fg_res, curr, ret; 347 348 pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS); 349 if (pwr_stat < 0) { 350 dev_err(&info->pdev->dev, 351 "PWR STAT read failed:%d\n", pwr_stat); 352 return; 353 } 354 355 /* Report full if Vbus is valid and the reported capacity is 100% */ 356 if (!(pwr_stat & PS_STAT_VBUS_VALID)) 357 goto not_full; 358 359 fg_res = fuel_gauge_reg_readb(info, AXP20X_FG_RES); 360 if (fg_res < 0) { 361 dev_err(&info->pdev->dev, "FG RES read failed: %d\n", fg_res); 362 return; 363 } 364 if (!(fg_res & FG_REP_CAP_VALID)) 365 goto not_full; 366 367 fg_res &= ~FG_REP_CAP_VALID; 368 if (fg_res == 100) { 369 info->status = POWER_SUPPLY_STATUS_FULL; 370 return; 371 } 372 373 /* 374 * Sometimes the charger turns itself off before fg-res reaches 100%. 375 * When this happens the AXP288 reports a not-charging status and 376 * 0 mA discharge current. 377 */ 378 if (fg_res < 90 || (pwr_stat & PS_STAT_BAT_CHRG_DIR)) 379 goto not_full; 380 381 ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &curr); 382 if (ret < 0) { 383 dev_err(&info->pdev->dev, "FG get current failed: %d\n", ret); 384 return; 385 } 386 if (curr == 0) { 387 info->status = POWER_SUPPLY_STATUS_FULL; 388 return; 389 } 390 391 not_full: 392 if (pwr_stat & PS_STAT_BAT_CHRG_DIR) 393 info->status = POWER_SUPPLY_STATUS_CHARGING; 394 else 395 info->status = POWER_SUPPLY_STATUS_DISCHARGING; 396 } 397 398 static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt) 399 { 400 int ret = 0, raw_val; 401 402 ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val); 403 if (ret < 0) 404 goto vbatt_read_fail; 405 406 *vbatt = VOLTAGE_FROM_ADC(raw_val); 407 vbatt_read_fail: 408 return ret; 409 } 410 411 static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur) 412 { 413 int ret, discharge; 414 415 /* First check discharge current, so that we do only 1 read on bat. */ 416 ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &discharge); 417 if (ret < 0) 418 return ret; 419 420 if (discharge > 0) { 421 *cur = -1 * discharge; 422 return 0; 423 } 424 425 return iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], cur); 426 } 427 428 static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv) 429 { 430 int ret; 431 432 ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG); 433 if (ret >= 0) 434 *vocv = VOLTAGE_FROM_ADC(ret); 435 436 return ret; 437 } 438 439 static int fuel_gauge_battery_health(struct axp288_fg_info *info) 440 { 441 int ret, vocv, health = POWER_SUPPLY_HEALTH_UNKNOWN; 442 443 ret = fuel_gauge_get_vocv(info, &vocv); 444 if (ret < 0) 445 goto health_read_fail; 446 447 if (vocv > info->max_volt) 448 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 449 else 450 health = POWER_SUPPLY_HEALTH_GOOD; 451 452 health_read_fail: 453 return health; 454 } 455 456 static int fuel_gauge_get_property(struct power_supply *ps, 457 enum power_supply_property prop, 458 union power_supply_propval *val) 459 { 460 struct axp288_fg_info *info = power_supply_get_drvdata(ps); 461 int ret = 0, value; 462 463 mutex_lock(&info->lock); 464 switch (prop) { 465 case POWER_SUPPLY_PROP_STATUS: 466 fuel_gauge_get_status(info); 467 val->intval = info->status; 468 break; 469 case POWER_SUPPLY_PROP_HEALTH: 470 val->intval = fuel_gauge_battery_health(info); 471 break; 472 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 473 ret = fuel_gauge_get_vbatt(info, &value); 474 if (ret < 0) 475 goto fuel_gauge_read_err; 476 val->intval = PROP_VOLT(value); 477 break; 478 case POWER_SUPPLY_PROP_VOLTAGE_OCV: 479 ret = fuel_gauge_get_vocv(info, &value); 480 if (ret < 0) 481 goto fuel_gauge_read_err; 482 val->intval = PROP_VOLT(value); 483 break; 484 case POWER_SUPPLY_PROP_CURRENT_NOW: 485 ret = fuel_gauge_get_current(info, &value); 486 if (ret < 0) 487 goto fuel_gauge_read_err; 488 val->intval = PROP_CURR(value); 489 break; 490 case POWER_SUPPLY_PROP_PRESENT: 491 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE); 492 if (ret < 0) 493 goto fuel_gauge_read_err; 494 495 if (ret & CHRG_STAT_BAT_PRESENT) 496 val->intval = 1; 497 else 498 val->intval = 0; 499 break; 500 case POWER_SUPPLY_PROP_CAPACITY: 501 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES); 502 if (ret < 0) 503 goto fuel_gauge_read_err; 504 505 if (!(ret & FG_REP_CAP_VALID)) 506 dev_err(&info->pdev->dev, 507 "capacity measurement not valid\n"); 508 val->intval = (ret & FG_REP_CAP_VAL_MASK); 509 break; 510 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: 511 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG); 512 if (ret < 0) 513 goto fuel_gauge_read_err; 514 val->intval = (ret & 0x0f); 515 break; 516 case POWER_SUPPLY_PROP_TECHNOLOGY: 517 val->intval = POWER_SUPPLY_TECHNOLOGY_LION; 518 break; 519 case POWER_SUPPLY_PROP_CHARGE_NOW: 520 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG); 521 if (ret < 0) 522 goto fuel_gauge_read_err; 523 524 val->intval = ret * FG_DES_CAP_RES_LSB; 525 break; 526 case POWER_SUPPLY_PROP_CHARGE_FULL: 527 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG); 528 if (ret < 0) 529 goto fuel_gauge_read_err; 530 531 val->intval = ret * FG_DES_CAP_RES_LSB; 532 break; 533 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 534 val->intval = PROP_VOLT(info->max_volt); 535 break; 536 default: 537 mutex_unlock(&info->lock); 538 return -EINVAL; 539 } 540 541 mutex_unlock(&info->lock); 542 return 0; 543 544 fuel_gauge_read_err: 545 mutex_unlock(&info->lock); 546 return ret; 547 } 548 549 static int fuel_gauge_set_property(struct power_supply *ps, 550 enum power_supply_property prop, 551 const union power_supply_propval *val) 552 { 553 struct axp288_fg_info *info = power_supply_get_drvdata(ps); 554 int ret = 0; 555 556 mutex_lock(&info->lock); 557 switch (prop) { 558 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: 559 if ((val->intval < 0) || (val->intval > 15)) { 560 ret = -EINVAL; 561 break; 562 } 563 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG); 564 if (ret < 0) 565 break; 566 ret &= 0xf0; 567 ret |= (val->intval & 0xf); 568 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret); 569 break; 570 default: 571 ret = -EINVAL; 572 break; 573 } 574 575 mutex_unlock(&info->lock); 576 return ret; 577 } 578 579 static int fuel_gauge_property_is_writeable(struct power_supply *psy, 580 enum power_supply_property psp) 581 { 582 int ret; 583 584 switch (psp) { 585 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: 586 ret = 1; 587 break; 588 default: 589 ret = 0; 590 } 591 592 return ret; 593 } 594 595 static void fuel_gauge_status_monitor(struct work_struct *work) 596 { 597 struct axp288_fg_info *info = container_of(work, 598 struct axp288_fg_info, status_monitor.work); 599 600 fuel_gauge_get_status(info); 601 power_supply_changed(info->bat); 602 schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES); 603 } 604 605 static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev) 606 { 607 struct axp288_fg_info *info = dev; 608 int i; 609 610 for (i = 0; i < AXP288_FG_INTR_NUM; i++) { 611 if (info->irq[i] == irq) 612 break; 613 } 614 615 if (i >= AXP288_FG_INTR_NUM) { 616 dev_warn(&info->pdev->dev, "spurious interrupt!!\n"); 617 return IRQ_NONE; 618 } 619 620 switch (i) { 621 case QWBTU_IRQ: 622 dev_info(&info->pdev->dev, 623 "Quit Battery under temperature in work mode IRQ (QWBTU)\n"); 624 break; 625 case WBTU_IRQ: 626 dev_info(&info->pdev->dev, 627 "Battery under temperature in work mode IRQ (WBTU)\n"); 628 break; 629 case QWBTO_IRQ: 630 dev_info(&info->pdev->dev, 631 "Quit Battery over temperature in work mode IRQ (QWBTO)\n"); 632 break; 633 case WBTO_IRQ: 634 dev_info(&info->pdev->dev, 635 "Battery over temperature in work mode IRQ (WBTO)\n"); 636 break; 637 case WL2_IRQ: 638 dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n"); 639 break; 640 case WL1_IRQ: 641 dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n"); 642 break; 643 default: 644 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n"); 645 } 646 647 power_supply_changed(info->bat); 648 return IRQ_HANDLED; 649 } 650 651 static void fuel_gauge_external_power_changed(struct power_supply *psy) 652 { 653 struct axp288_fg_info *info = power_supply_get_drvdata(psy); 654 655 power_supply_changed(info->bat); 656 } 657 658 static const struct power_supply_desc fuel_gauge_desc = { 659 .name = DEV_NAME, 660 .type = POWER_SUPPLY_TYPE_BATTERY, 661 .properties = fuel_gauge_props, 662 .num_properties = ARRAY_SIZE(fuel_gauge_props), 663 .get_property = fuel_gauge_get_property, 664 .set_property = fuel_gauge_set_property, 665 .property_is_writeable = fuel_gauge_property_is_writeable, 666 .external_power_changed = fuel_gauge_external_power_changed, 667 }; 668 669 static void fuel_gauge_init_irq(struct axp288_fg_info *info) 670 { 671 int ret, i, pirq; 672 673 for (i = 0; i < AXP288_FG_INTR_NUM; i++) { 674 pirq = platform_get_irq(info->pdev, i); 675 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq); 676 if (info->irq[i] < 0) { 677 dev_warn(&info->pdev->dev, 678 "regmap_irq get virq failed for IRQ %d: %d\n", 679 pirq, info->irq[i]); 680 info->irq[i] = -1; 681 goto intr_failed; 682 } 683 ret = request_threaded_irq(info->irq[i], 684 NULL, fuel_gauge_thread_handler, 685 IRQF_ONESHOT, DEV_NAME, info); 686 if (ret) { 687 dev_warn(&info->pdev->dev, 688 "request irq failed for IRQ %d: %d\n", 689 pirq, info->irq[i]); 690 info->irq[i] = -1; 691 goto intr_failed; 692 } else { 693 dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n", 694 pirq, info->irq[i]); 695 } 696 } 697 return; 698 699 intr_failed: 700 for (; i > 0; i--) { 701 free_irq(info->irq[i - 1], info); 702 info->irq[i - 1] = -1; 703 } 704 } 705 706 /* 707 * Some devices have no battery (HDMI sticks) and the axp288 battery's 708 * detection reports one despite it not being there. 709 */ 710 static const struct dmi_system_id axp288_fuel_gauge_blacklist[] = { 711 { 712 /* Intel Cherry Trail Compute Stick, Windows version */ 713 .matches = { 714 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"), 715 DMI_MATCH(DMI_PRODUCT_NAME, "STK1AW32SC"), 716 }, 717 }, 718 { 719 /* Intel Cherry Trail Compute Stick, version without an OS */ 720 .matches = { 721 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"), 722 DMI_MATCH(DMI_PRODUCT_NAME, "STK1A32SC"), 723 }, 724 }, 725 { 726 /* Meegopad T08 */ 727 .matches = { 728 DMI_MATCH(DMI_SYS_VENDOR, "Default string"), 729 DMI_MATCH(DMI_BOARD_VENDOR, "To be filled by OEM."), 730 DMI_MATCH(DMI_BOARD_NAME, "T3 MRD"), 731 DMI_MATCH(DMI_BOARD_VERSION, "V1.1"), 732 }, 733 }, 734 { 735 /* ECS EF20EA */ 736 .matches = { 737 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"), 738 }, 739 }, 740 {} 741 }; 742 743 static int axp288_fuel_gauge_probe(struct platform_device *pdev) 744 { 745 int i, ret = 0; 746 struct axp288_fg_info *info; 747 struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); 748 struct power_supply_config psy_cfg = {}; 749 static const char * const iio_chan_name[] = { 750 [BAT_TEMP] = "axp288-batt-temp", 751 [PMIC_TEMP] = "axp288-pmic-temp", 752 [SYSTEM_TEMP] = "axp288-system-temp", 753 [BAT_CHRG_CURR] = "axp288-chrg-curr", 754 [BAT_D_CURR] = "axp288-chrg-d-curr", 755 [BAT_VOLT] = "axp288-batt-volt", 756 }; 757 758 if (dmi_check_system(axp288_fuel_gauge_blacklist)) 759 return -ENODEV; 760 761 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 762 if (!info) 763 return -ENOMEM; 764 765 info->pdev = pdev; 766 info->regmap = axp20x->regmap; 767 info->regmap_irqc = axp20x->regmap_irqc; 768 info->status = POWER_SUPPLY_STATUS_UNKNOWN; 769 770 platform_set_drvdata(pdev, info); 771 772 mutex_init(&info->lock); 773 INIT_DELAYED_WORK(&info->status_monitor, fuel_gauge_status_monitor); 774 775 for (i = 0; i < IIO_CHANNEL_NUM; i++) { 776 /* 777 * Note cannot use devm_iio_channel_get because x86 systems 778 * lack the device<->channel maps which iio_channel_get will 779 * try to use when passed a non NULL device pointer. 780 */ 781 info->iio_channel[i] = 782 iio_channel_get(NULL, iio_chan_name[i]); 783 if (IS_ERR(info->iio_channel[i])) { 784 ret = PTR_ERR(info->iio_channel[i]); 785 dev_dbg(&pdev->dev, "error getting iiochan %s: %d\n", 786 iio_chan_name[i], ret); 787 /* Wait for axp288_adc to load */ 788 if (ret == -ENODEV) 789 ret = -EPROBE_DEFER; 790 791 goto out_free_iio_chan; 792 } 793 } 794 795 ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG); 796 if (ret < 0) 797 goto out_free_iio_chan; 798 799 if (!(ret & FG_DES_CAP1_VALID)) { 800 dev_err(&pdev->dev, "axp288 not configured by firmware\n"); 801 ret = -ENODEV; 802 goto out_free_iio_chan; 803 } 804 805 ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1); 806 if (ret < 0) 807 goto out_free_iio_chan; 808 switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) { 809 case CHRG_CCCV_CV_4100MV: 810 info->max_volt = 4100; 811 break; 812 case CHRG_CCCV_CV_4150MV: 813 info->max_volt = 4150; 814 break; 815 case CHRG_CCCV_CV_4200MV: 816 info->max_volt = 4200; 817 break; 818 case CHRG_CCCV_CV_4350MV: 819 info->max_volt = 4350; 820 break; 821 } 822 823 psy_cfg.drv_data = info; 824 info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg); 825 if (IS_ERR(info->bat)) { 826 ret = PTR_ERR(info->bat); 827 dev_err(&pdev->dev, "failed to register battery: %d\n", ret); 828 goto out_free_iio_chan; 829 } 830 831 fuel_gauge_create_debugfs(info); 832 fuel_gauge_init_irq(info); 833 schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES); 834 835 return 0; 836 837 out_free_iio_chan: 838 for (i = 0; i < IIO_CHANNEL_NUM; i++) 839 if (!IS_ERR_OR_NULL(info->iio_channel[i])) 840 iio_channel_release(info->iio_channel[i]); 841 842 return ret; 843 } 844 845 static const struct platform_device_id axp288_fg_id_table[] = { 846 { .name = DEV_NAME }, 847 {}, 848 }; 849 MODULE_DEVICE_TABLE(platform, axp288_fg_id_table); 850 851 static int axp288_fuel_gauge_remove(struct platform_device *pdev) 852 { 853 struct axp288_fg_info *info = platform_get_drvdata(pdev); 854 int i; 855 856 cancel_delayed_work_sync(&info->status_monitor); 857 power_supply_unregister(info->bat); 858 fuel_gauge_remove_debugfs(info); 859 860 for (i = 0; i < AXP288_FG_INTR_NUM; i++) 861 if (info->irq[i] >= 0) 862 free_irq(info->irq[i], info); 863 864 for (i = 0; i < IIO_CHANNEL_NUM; i++) 865 iio_channel_release(info->iio_channel[i]); 866 867 return 0; 868 } 869 870 static struct platform_driver axp288_fuel_gauge_driver = { 871 .probe = axp288_fuel_gauge_probe, 872 .remove = axp288_fuel_gauge_remove, 873 .id_table = axp288_fg_id_table, 874 .driver = { 875 .name = DEV_NAME, 876 }, 877 }; 878 879 module_platform_driver(axp288_fuel_gauge_driver); 880 881 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>"); 882 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>"); 883 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver"); 884 MODULE_LICENSE("GPL"); 885