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; 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 fg_res = fuel_gauge_reg_readb(info, AXP20X_FG_RES); 358 if (fg_res < 0) { 359 dev_err(&info->pdev->dev, 360 "FG RES read failed: %d\n", fg_res); 361 return; 362 } 363 if (fg_res == (FG_REP_CAP_VALID | 100)) { 364 info->status = POWER_SUPPLY_STATUS_FULL; 365 return; 366 } 367 } 368 369 if (pwr_stat & PS_STAT_BAT_CHRG_DIR) 370 info->status = POWER_SUPPLY_STATUS_CHARGING; 371 else 372 info->status = POWER_SUPPLY_STATUS_DISCHARGING; 373 } 374 375 static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt) 376 { 377 int ret = 0, raw_val; 378 379 ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val); 380 if (ret < 0) 381 goto vbatt_read_fail; 382 383 *vbatt = VOLTAGE_FROM_ADC(raw_val); 384 vbatt_read_fail: 385 return ret; 386 } 387 388 static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur) 389 { 390 int ret, discharge; 391 392 /* First check discharge current, so that we do only 1 read on bat. */ 393 ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &discharge); 394 if (ret < 0) 395 return ret; 396 397 if (discharge > 0) { 398 *cur = -1 * discharge; 399 return 0; 400 } 401 402 return iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], cur); 403 } 404 405 static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv) 406 { 407 int ret; 408 409 ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG); 410 if (ret >= 0) 411 *vocv = VOLTAGE_FROM_ADC(ret); 412 413 return ret; 414 } 415 416 static int fuel_gauge_battery_health(struct axp288_fg_info *info) 417 { 418 int ret, vocv, health = POWER_SUPPLY_HEALTH_UNKNOWN; 419 420 ret = fuel_gauge_get_vocv(info, &vocv); 421 if (ret < 0) 422 goto health_read_fail; 423 424 if (vocv > info->max_volt) 425 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 426 else 427 health = POWER_SUPPLY_HEALTH_GOOD; 428 429 health_read_fail: 430 return health; 431 } 432 433 static int fuel_gauge_get_property(struct power_supply *ps, 434 enum power_supply_property prop, 435 union power_supply_propval *val) 436 { 437 struct axp288_fg_info *info = power_supply_get_drvdata(ps); 438 int ret = 0, value; 439 440 mutex_lock(&info->lock); 441 switch (prop) { 442 case POWER_SUPPLY_PROP_STATUS: 443 fuel_gauge_get_status(info); 444 val->intval = info->status; 445 break; 446 case POWER_SUPPLY_PROP_HEALTH: 447 val->intval = fuel_gauge_battery_health(info); 448 break; 449 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 450 ret = fuel_gauge_get_vbatt(info, &value); 451 if (ret < 0) 452 goto fuel_gauge_read_err; 453 val->intval = PROP_VOLT(value); 454 break; 455 case POWER_SUPPLY_PROP_VOLTAGE_OCV: 456 ret = fuel_gauge_get_vocv(info, &value); 457 if (ret < 0) 458 goto fuel_gauge_read_err; 459 val->intval = PROP_VOLT(value); 460 break; 461 case POWER_SUPPLY_PROP_CURRENT_NOW: 462 ret = fuel_gauge_get_current(info, &value); 463 if (ret < 0) 464 goto fuel_gauge_read_err; 465 val->intval = PROP_CURR(value); 466 break; 467 case POWER_SUPPLY_PROP_PRESENT: 468 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE); 469 if (ret < 0) 470 goto fuel_gauge_read_err; 471 472 if (ret & CHRG_STAT_BAT_PRESENT) 473 val->intval = 1; 474 else 475 val->intval = 0; 476 break; 477 case POWER_SUPPLY_PROP_CAPACITY: 478 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES); 479 if (ret < 0) 480 goto fuel_gauge_read_err; 481 482 if (!(ret & FG_REP_CAP_VALID)) 483 dev_err(&info->pdev->dev, 484 "capacity measurement not valid\n"); 485 val->intval = (ret & FG_REP_CAP_VAL_MASK); 486 break; 487 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: 488 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG); 489 if (ret < 0) 490 goto fuel_gauge_read_err; 491 val->intval = (ret & 0x0f); 492 break; 493 case POWER_SUPPLY_PROP_TECHNOLOGY: 494 val->intval = POWER_SUPPLY_TECHNOLOGY_LION; 495 break; 496 case POWER_SUPPLY_PROP_CHARGE_NOW: 497 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG); 498 if (ret < 0) 499 goto fuel_gauge_read_err; 500 501 val->intval = ret * FG_DES_CAP_RES_LSB; 502 break; 503 case POWER_SUPPLY_PROP_CHARGE_FULL: 504 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG); 505 if (ret < 0) 506 goto fuel_gauge_read_err; 507 508 val->intval = ret * FG_DES_CAP_RES_LSB; 509 break; 510 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 511 val->intval = PROP_VOLT(info->max_volt); 512 break; 513 default: 514 mutex_unlock(&info->lock); 515 return -EINVAL; 516 } 517 518 mutex_unlock(&info->lock); 519 return 0; 520 521 fuel_gauge_read_err: 522 mutex_unlock(&info->lock); 523 return ret; 524 } 525 526 static int fuel_gauge_set_property(struct power_supply *ps, 527 enum power_supply_property prop, 528 const union power_supply_propval *val) 529 { 530 struct axp288_fg_info *info = power_supply_get_drvdata(ps); 531 int ret = 0; 532 533 mutex_lock(&info->lock); 534 switch (prop) { 535 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: 536 if ((val->intval < 0) || (val->intval > 15)) { 537 ret = -EINVAL; 538 break; 539 } 540 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG); 541 if (ret < 0) 542 break; 543 ret &= 0xf0; 544 ret |= (val->intval & 0xf); 545 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret); 546 break; 547 default: 548 ret = -EINVAL; 549 break; 550 } 551 552 mutex_unlock(&info->lock); 553 return ret; 554 } 555 556 static int fuel_gauge_property_is_writeable(struct power_supply *psy, 557 enum power_supply_property psp) 558 { 559 int ret; 560 561 switch (psp) { 562 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN: 563 ret = 1; 564 break; 565 default: 566 ret = 0; 567 } 568 569 return ret; 570 } 571 572 static void fuel_gauge_status_monitor(struct work_struct *work) 573 { 574 struct axp288_fg_info *info = container_of(work, 575 struct axp288_fg_info, status_monitor.work); 576 577 fuel_gauge_get_status(info); 578 power_supply_changed(info->bat); 579 schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES); 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 }; 713 714 static int axp288_fuel_gauge_probe(struct platform_device *pdev) 715 { 716 int i, ret = 0; 717 struct axp288_fg_info *info; 718 struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); 719 struct power_supply_config psy_cfg = {}; 720 static const char * const iio_chan_name[] = { 721 [BAT_TEMP] = "axp288-batt-temp", 722 [PMIC_TEMP] = "axp288-pmic-temp", 723 [SYSTEM_TEMP] = "axp288-system-temp", 724 [BAT_CHRG_CURR] = "axp288-chrg-curr", 725 [BAT_D_CURR] = "axp288-chrg-d-curr", 726 [BAT_VOLT] = "axp288-batt-volt", 727 }; 728 729 if (dmi_check_system(axp288_fuel_gauge_blacklist)) 730 return -ENODEV; 731 732 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 733 if (!info) 734 return -ENOMEM; 735 736 info->pdev = pdev; 737 info->regmap = axp20x->regmap; 738 info->regmap_irqc = axp20x->regmap_irqc; 739 info->status = POWER_SUPPLY_STATUS_UNKNOWN; 740 741 platform_set_drvdata(pdev, info); 742 743 mutex_init(&info->lock); 744 INIT_DELAYED_WORK(&info->status_monitor, fuel_gauge_status_monitor); 745 746 for (i = 0; i < IIO_CHANNEL_NUM; i++) { 747 /* 748 * Note cannot use devm_iio_channel_get because x86 systems 749 * lack the device<->channel maps which iio_channel_get will 750 * try to use when passed a non NULL device pointer. 751 */ 752 info->iio_channel[i] = 753 iio_channel_get(NULL, iio_chan_name[i]); 754 if (IS_ERR(info->iio_channel[i])) { 755 ret = PTR_ERR(info->iio_channel[i]); 756 dev_dbg(&pdev->dev, "error getting iiochan %s: %d\n", 757 iio_chan_name[i], ret); 758 /* Wait for axp288_adc to load */ 759 if (ret == -ENODEV) 760 ret = -EPROBE_DEFER; 761 762 goto out_free_iio_chan; 763 } 764 } 765 766 ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG); 767 if (ret < 0) 768 goto out_free_iio_chan; 769 770 if (!(ret & FG_DES_CAP1_VALID)) { 771 dev_err(&pdev->dev, "axp288 not configured by firmware\n"); 772 ret = -ENODEV; 773 goto out_free_iio_chan; 774 } 775 776 ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1); 777 if (ret < 0) 778 goto out_free_iio_chan; 779 switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) { 780 case CHRG_CCCV_CV_4100MV: 781 info->max_volt = 4100; 782 break; 783 case CHRG_CCCV_CV_4150MV: 784 info->max_volt = 4150; 785 break; 786 case CHRG_CCCV_CV_4200MV: 787 info->max_volt = 4200; 788 break; 789 case CHRG_CCCV_CV_4350MV: 790 info->max_volt = 4350; 791 break; 792 } 793 794 psy_cfg.drv_data = info; 795 info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg); 796 if (IS_ERR(info->bat)) { 797 ret = PTR_ERR(info->bat); 798 dev_err(&pdev->dev, "failed to register battery: %d\n", ret); 799 goto out_free_iio_chan; 800 } 801 802 fuel_gauge_create_debugfs(info); 803 fuel_gauge_init_irq(info); 804 schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES); 805 806 return 0; 807 808 out_free_iio_chan: 809 for (i = 0; i < IIO_CHANNEL_NUM; i++) 810 if (!IS_ERR_OR_NULL(info->iio_channel[i])) 811 iio_channel_release(info->iio_channel[i]); 812 813 return ret; 814 } 815 816 static const struct platform_device_id axp288_fg_id_table[] = { 817 { .name = DEV_NAME }, 818 {}, 819 }; 820 MODULE_DEVICE_TABLE(platform, axp288_fg_id_table); 821 822 static int axp288_fuel_gauge_remove(struct platform_device *pdev) 823 { 824 struct axp288_fg_info *info = platform_get_drvdata(pdev); 825 int i; 826 827 cancel_delayed_work_sync(&info->status_monitor); 828 power_supply_unregister(info->bat); 829 fuel_gauge_remove_debugfs(info); 830 831 for (i = 0; i < AXP288_FG_INTR_NUM; i++) 832 if (info->irq[i] >= 0) 833 free_irq(info->irq[i], info); 834 835 for (i = 0; i < IIO_CHANNEL_NUM; i++) 836 iio_channel_release(info->iio_channel[i]); 837 838 return 0; 839 } 840 841 static struct platform_driver axp288_fuel_gauge_driver = { 842 .probe = axp288_fuel_gauge_probe, 843 .remove = axp288_fuel_gauge_remove, 844 .id_table = axp288_fg_id_table, 845 .driver = { 846 .name = DEV_NAME, 847 }, 848 }; 849 850 module_platform_driver(axp288_fuel_gauge_driver); 851 852 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>"); 853 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>"); 854 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver"); 855 MODULE_LICENSE("GPL"); 856