1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Batttery Driver for Dialog DA9052 PMICs 4 * 5 * Copyright(c) 2011 Dialog Semiconductor Ltd. 6 * 7 * Author: David Dajun Chen <dchen@diasemi.com> 8 */ 9 10 #include <linux/delay.h> 11 #include <linux/freezer.h> 12 #include <linux/fs.h> 13 #include <linux/jiffies.h> 14 #include <linux/module.h> 15 #include <linux/timer.h> 16 #include <linux/uaccess.h> 17 #include <linux/platform_device.h> 18 #include <linux/power_supply.h> 19 20 #include <linux/mfd/da9052/da9052.h> 21 #include <linux/mfd/da9052/pdata.h> 22 #include <linux/mfd/da9052/reg.h> 23 24 /* STATIC CONFIGURATION */ 25 #define DA9052_BAT_CUTOFF_VOLT 2800 26 #define DA9052_BAT_TSH 62000 27 #define DA9052_BAT_LOW_CAP 4 28 #define DA9052_AVG_SZ 4 29 #define DA9052_VC_TBL_SZ 68 30 #define DA9052_VC_TBL_REF_SZ 3 31 32 #define DA9052_ISET_USB_MASK 0x0F 33 #define DA9052_CHG_USB_ILIM_MASK 0x40 34 #define DA9052_CHG_LIM_COLS 16 35 36 #define DA9052_MEAN(x, y) ((x + y) / 2) 37 38 enum charger_type_enum { 39 DA9052_NOCHARGER = 1, 40 DA9052_CHARGER, 41 }; 42 43 static const u16 da9052_chg_current_lim[2][DA9052_CHG_LIM_COLS] = { 44 {70, 80, 90, 100, 110, 120, 400, 450, 45 500, 550, 600, 650, 700, 900, 1100, 1300}, 46 {80, 90, 100, 110, 120, 400, 450, 500, 47 550, 600, 800, 1000, 1200, 1400, 1600, 1800}, 48 }; 49 50 static const u16 vc_tbl_ref[3] = {10, 25, 40}; 51 /* Lookup table for voltage vs capacity */ 52 static u32 const vc_tbl[3][68][2] = { 53 /* For temperature 10 degree Celsius */ 54 { 55 {4082, 100}, {4036, 98}, 56 {4020, 96}, {4008, 95}, 57 {3997, 93}, {3983, 91}, 58 {3964, 90}, {3943, 88}, 59 {3926, 87}, {3912, 85}, 60 {3900, 84}, {3890, 82}, 61 {3881, 80}, {3873, 79}, 62 {3865, 77}, {3857, 76}, 63 {3848, 74}, {3839, 73}, 64 {3829, 71}, {3820, 70}, 65 {3811, 68}, {3802, 67}, 66 {3794, 65}, {3785, 64}, 67 {3778, 62}, {3770, 61}, 68 {3763, 59}, {3756, 58}, 69 {3750, 56}, {3744, 55}, 70 {3738, 53}, {3732, 52}, 71 {3727, 50}, {3722, 49}, 72 {3717, 47}, {3712, 46}, 73 {3708, 44}, {3703, 43}, 74 {3700, 41}, {3696, 40}, 75 {3693, 38}, {3691, 37}, 76 {3688, 35}, {3686, 34}, 77 {3683, 32}, {3681, 31}, 78 {3678, 29}, {3675, 28}, 79 {3672, 26}, {3669, 25}, 80 {3665, 23}, {3661, 22}, 81 {3656, 21}, {3651, 19}, 82 {3645, 18}, {3639, 16}, 83 {3631, 15}, {3622, 13}, 84 {3611, 12}, {3600, 10}, 85 {3587, 9}, {3572, 7}, 86 {3548, 6}, {3503, 5}, 87 {3420, 3}, {3268, 2}, 88 {2992, 1}, {2746, 0} 89 }, 90 /* For temperature 25 degree Celsius */ 91 { 92 {4102, 100}, {4065, 98}, 93 {4048, 96}, {4034, 95}, 94 {4021, 93}, {4011, 92}, 95 {4001, 90}, {3986, 88}, 96 {3968, 87}, {3952, 85}, 97 {3938, 84}, {3926, 82}, 98 {3916, 81}, {3908, 79}, 99 {3900, 77}, {3892, 76}, 100 {3883, 74}, {3874, 73}, 101 {3864, 71}, {3855, 70}, 102 {3846, 68}, {3836, 67}, 103 {3827, 65}, {3819, 64}, 104 {3810, 62}, {3801, 61}, 105 {3793, 59}, {3786, 58}, 106 {3778, 56}, {3772, 55}, 107 {3765, 53}, {3759, 52}, 108 {3754, 50}, {3748, 49}, 109 {3743, 47}, {3738, 46}, 110 {3733, 44}, {3728, 43}, 111 {3724, 41}, {3720, 40}, 112 {3716, 38}, {3712, 37}, 113 {3709, 35}, {3706, 34}, 114 {3703, 33}, {3701, 31}, 115 {3698, 30}, {3696, 28}, 116 {3693, 27}, {3690, 25}, 117 {3687, 24}, {3683, 22}, 118 {3680, 21}, {3675, 19}, 119 {3671, 18}, {3666, 17}, 120 {3660, 15}, {3654, 14}, 121 {3647, 12}, {3639, 11}, 122 {3630, 9}, {3621, 8}, 123 {3613, 6}, {3606, 5}, 124 {3597, 4}, {3582, 2}, 125 {3546, 1}, {2747, 0} 126 }, 127 /* For temperature 40 degree Celsius */ 128 { 129 {4114, 100}, {4081, 98}, 130 {4065, 96}, {4050, 95}, 131 {4036, 93}, {4024, 92}, 132 {4013, 90}, {4002, 88}, 133 {3990, 87}, {3976, 85}, 134 {3962, 84}, {3950, 82}, 135 {3939, 81}, {3930, 79}, 136 {3921, 77}, {3912, 76}, 137 {3902, 74}, {3893, 73}, 138 {3883, 71}, {3874, 70}, 139 {3865, 68}, {3856, 67}, 140 {3847, 65}, {3838, 64}, 141 {3829, 62}, {3820, 61}, 142 {3812, 59}, {3803, 58}, 143 {3795, 56}, {3787, 55}, 144 {3780, 53}, {3773, 52}, 145 {3767, 50}, {3761, 49}, 146 {3756, 47}, {3751, 46}, 147 {3746, 44}, {3741, 43}, 148 {3736, 41}, {3732, 40}, 149 {3728, 38}, {3724, 37}, 150 {3720, 35}, {3716, 34}, 151 {3713, 33}, {3710, 31}, 152 {3707, 30}, {3704, 28}, 153 {3701, 27}, {3698, 25}, 154 {3695, 24}, {3691, 22}, 155 {3686, 21}, {3681, 19}, 156 {3676, 18}, {3671, 17}, 157 {3666, 15}, {3661, 14}, 158 {3655, 12}, {3648, 11}, 159 {3640, 9}, {3632, 8}, 160 {3622, 6}, {3616, 5}, 161 {3611, 4}, {3604, 2}, 162 {3594, 1}, {2747, 0} 163 } 164 }; 165 166 struct da9052_battery { 167 struct da9052 *da9052; 168 struct power_supply *psy; 169 struct notifier_block nb; 170 int charger_type; 171 int status; 172 int health; 173 }; 174 175 static inline int volt_reg_to_mV(int value) 176 { 177 return ((value * 1000) / 512) + 2500; 178 } 179 180 static inline int ichg_reg_to_mA(int value) 181 { 182 return (value * 3900) / 1000; 183 } 184 185 static int da9052_read_chgend_current(struct da9052_battery *bat, 186 int *current_mA) 187 { 188 int ret; 189 190 if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) 191 return -EINVAL; 192 193 ret = da9052_reg_read(bat->da9052, DA9052_ICHG_END_REG); 194 if (ret < 0) 195 return ret; 196 197 *current_mA = ichg_reg_to_mA(ret & DA9052_ICHGEND_ICHGEND); 198 199 return 0; 200 } 201 202 static int da9052_read_chg_current(struct da9052_battery *bat, int *current_mA) 203 { 204 int ret; 205 206 if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) 207 return -EINVAL; 208 209 ret = da9052_reg_read(bat->da9052, DA9052_ICHG_AV_REG); 210 if (ret < 0) 211 return ret; 212 213 *current_mA = ichg_reg_to_mA(ret & DA9052_ICHGAV_ICHGAV); 214 215 return 0; 216 } 217 218 static int da9052_bat_check_status(struct da9052_battery *bat, int *status) 219 { 220 u8 v[2] = {0, 0}; 221 u8 bat_status; 222 u8 chg_end; 223 int ret; 224 int chg_current; 225 int chg_end_current; 226 bool dcinsel; 227 bool dcindet; 228 bool vbussel; 229 bool vbusdet; 230 bool dc; 231 bool vbus; 232 233 ret = da9052_group_read(bat->da9052, DA9052_STATUS_A_REG, 2, v); 234 if (ret < 0) 235 return ret; 236 237 bat_status = v[0]; 238 chg_end = v[1]; 239 240 dcinsel = bat_status & DA9052_STATUSA_DCINSEL; 241 dcindet = bat_status & DA9052_STATUSA_DCINDET; 242 vbussel = bat_status & DA9052_STATUSA_VBUSSEL; 243 vbusdet = bat_status & DA9052_STATUSA_VBUSDET; 244 dc = dcinsel && dcindet; 245 vbus = vbussel && vbusdet; 246 247 /* Preference to WALL(DCIN) charger unit */ 248 if (dc || vbus) { 249 bat->charger_type = DA9052_CHARGER; 250 251 /* If charging end flag is set and Charging current is greater 252 * than charging end limit then battery is charging 253 */ 254 if ((chg_end & DA9052_STATUSB_CHGEND) != 0) { 255 ret = da9052_read_chg_current(bat, &chg_current); 256 if (ret < 0) 257 return ret; 258 ret = da9052_read_chgend_current(bat, &chg_end_current); 259 if (ret < 0) 260 return ret; 261 262 if (chg_current >= chg_end_current) 263 bat->status = POWER_SUPPLY_STATUS_CHARGING; 264 else 265 bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING; 266 } else { 267 /* If Charging end flag is cleared then battery is 268 * charging 269 */ 270 bat->status = POWER_SUPPLY_STATUS_CHARGING; 271 } 272 } else if (dcindet || vbusdet) { 273 bat->charger_type = DA9052_CHARGER; 274 bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING; 275 } else { 276 bat->charger_type = DA9052_NOCHARGER; 277 bat->status = POWER_SUPPLY_STATUS_DISCHARGING; 278 } 279 280 if (status != NULL) 281 *status = bat->status; 282 return 0; 283 } 284 285 static int da9052_bat_read_volt(struct da9052_battery *bat, int *volt_mV) 286 { 287 int volt; 288 289 volt = da9052_adc_manual_read(bat->da9052, DA9052_ADC_MAN_MUXSEL_VBAT); 290 if (volt < 0) 291 return volt; 292 293 *volt_mV = volt_reg_to_mV(volt); 294 295 return 0; 296 } 297 298 static int da9052_bat_check_presence(struct da9052_battery *bat, int *illegal) 299 { 300 int bat_temp; 301 302 bat_temp = da9052_adc_read_temp(bat->da9052); 303 if (bat_temp < 0) 304 return bat_temp; 305 306 if (bat_temp > DA9052_BAT_TSH) 307 *illegal = 1; 308 else 309 *illegal = 0; 310 311 return 0; 312 } 313 314 static int da9052_bat_interpolate(int vbat_lower, int vbat_upper, 315 int level_lower, int level_upper, 316 int bat_voltage) 317 { 318 int tmp; 319 320 tmp = ((level_upper - level_lower) * 1000) / (vbat_upper - vbat_lower); 321 tmp = level_lower + (((bat_voltage - vbat_lower) * tmp) / 1000); 322 323 return tmp; 324 } 325 326 static unsigned char da9052_determine_vc_tbl_index(unsigned char adc_temp) 327 { 328 int i; 329 330 if (adc_temp <= vc_tbl_ref[0]) 331 return 0; 332 333 if (adc_temp > vc_tbl_ref[DA9052_VC_TBL_REF_SZ - 1]) 334 return DA9052_VC_TBL_REF_SZ - 1; 335 336 for (i = 0; i < DA9052_VC_TBL_REF_SZ - 1; i++) { 337 if ((adc_temp > vc_tbl_ref[i]) && 338 (adc_temp <= DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1]))) 339 return i; 340 if ((adc_temp > DA9052_MEAN(vc_tbl_ref[i], vc_tbl_ref[i + 1])) 341 && (adc_temp <= vc_tbl_ref[i])) 342 return i + 1; 343 } 344 /* 345 * For some reason authors of the driver didn't presume that we can 346 * end up here. It might be OK, but might be not, no one knows for 347 * sure. Go check your battery, is it on fire? 348 */ 349 WARN_ON(1); 350 return 0; 351 } 352 353 static int da9052_bat_read_capacity(struct da9052_battery *bat, int *capacity) 354 { 355 int adc_temp; 356 int bat_voltage; 357 int vbat_lower; 358 int vbat_upper; 359 int level_upper; 360 int level_lower; 361 int ret; 362 int flag; 363 int i = 0; 364 int j; 365 366 ret = da9052_bat_read_volt(bat, &bat_voltage); 367 if (ret < 0) 368 return ret; 369 370 adc_temp = da9052_adc_read_temp(bat->da9052); 371 if (adc_temp < 0) 372 return adc_temp; 373 374 i = da9052_determine_vc_tbl_index(adc_temp); 375 376 if (bat_voltage >= vc_tbl[i][0][0]) { 377 *capacity = 100; 378 return 0; 379 } 380 if (bat_voltage <= vc_tbl[i][DA9052_VC_TBL_SZ - 1][0]) { 381 *capacity = 0; 382 return 0; 383 } 384 flag = 0; 385 386 for (j = 0; j < (DA9052_VC_TBL_SZ-1); j++) { 387 if ((bat_voltage <= vc_tbl[i][j][0]) && 388 (bat_voltage >= vc_tbl[i][j + 1][0])) { 389 vbat_upper = vc_tbl[i][j][0]; 390 vbat_lower = vc_tbl[i][j + 1][0]; 391 level_upper = vc_tbl[i][j][1]; 392 level_lower = vc_tbl[i][j + 1][1]; 393 flag = 1; 394 break; 395 } 396 } 397 if (!flag) 398 return -EIO; 399 400 *capacity = da9052_bat_interpolate(vbat_lower, vbat_upper, level_lower, 401 level_upper, bat_voltage); 402 403 return 0; 404 } 405 406 static int da9052_bat_check_health(struct da9052_battery *bat, int *health) 407 { 408 int ret; 409 int bat_illegal; 410 int capacity; 411 412 ret = da9052_bat_check_presence(bat, &bat_illegal); 413 if (ret < 0) 414 return ret; 415 416 if (bat_illegal) { 417 bat->health = POWER_SUPPLY_HEALTH_UNKNOWN; 418 return 0; 419 } 420 421 if (bat->health != POWER_SUPPLY_HEALTH_OVERHEAT) { 422 ret = da9052_bat_read_capacity(bat, &capacity); 423 if (ret < 0) 424 return ret; 425 if (capacity < DA9052_BAT_LOW_CAP) 426 bat->health = POWER_SUPPLY_HEALTH_DEAD; 427 else 428 bat->health = POWER_SUPPLY_HEALTH_GOOD; 429 } 430 431 *health = bat->health; 432 433 return 0; 434 } 435 436 static irqreturn_t da9052_bat_irq(int irq, void *data) 437 { 438 struct da9052_battery *bat = data; 439 int virq; 440 441 virq = regmap_irq_get_virq(bat->da9052->irq_data, irq); 442 irq -= virq; 443 444 if (irq == DA9052_IRQ_CHGEND) 445 bat->status = POWER_SUPPLY_STATUS_FULL; 446 else 447 da9052_bat_check_status(bat, NULL); 448 449 if (irq == DA9052_IRQ_CHGEND || irq == DA9052_IRQ_DCIN || 450 irq == DA9052_IRQ_VBUS || irq == DA9052_IRQ_TBAT) { 451 power_supply_changed(bat->psy); 452 } 453 454 return IRQ_HANDLED; 455 } 456 457 static int da9052_USB_current_notifier(struct notifier_block *nb, 458 unsigned long events, void *data) 459 { 460 u8 row; 461 u8 col; 462 int *current_mA = data; 463 int ret; 464 struct da9052_battery *bat = container_of(nb, struct da9052_battery, 465 nb); 466 467 if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) 468 return -EPERM; 469 470 ret = da9052_reg_read(bat->da9052, DA9052_CHGBUCK_REG); 471 if (ret & DA9052_CHG_USB_ILIM_MASK) 472 return -EPERM; 473 474 if (bat->da9052->chip_id == DA9052) 475 row = 0; 476 else 477 row = 1; 478 479 if (*current_mA < da9052_chg_current_lim[row][0] || 480 *current_mA > da9052_chg_current_lim[row][DA9052_CHG_LIM_COLS - 1]) 481 return -EINVAL; 482 483 for (col = 0; col <= DA9052_CHG_LIM_COLS - 1 ; col++) { 484 if (*current_mA <= da9052_chg_current_lim[row][col]) 485 break; 486 } 487 488 return da9052_reg_update(bat->da9052, DA9052_ISET_REG, 489 DA9052_ISET_USB_MASK, col); 490 } 491 492 static int da9052_bat_get_property(struct power_supply *psy, 493 enum power_supply_property psp, 494 union power_supply_propval *val) 495 { 496 int ret; 497 int illegal; 498 struct da9052_battery *bat = power_supply_get_drvdata(psy); 499 500 ret = da9052_bat_check_presence(bat, &illegal); 501 if (ret < 0) 502 return ret; 503 504 if (illegal && psp != POWER_SUPPLY_PROP_PRESENT) 505 return -ENODEV; 506 507 switch (psp) { 508 case POWER_SUPPLY_PROP_STATUS: 509 ret = da9052_bat_check_status(bat, &val->intval); 510 break; 511 case POWER_SUPPLY_PROP_ONLINE: 512 val->intval = 513 (bat->charger_type == DA9052_NOCHARGER) ? 0 : 1; 514 break; 515 case POWER_SUPPLY_PROP_PRESENT: 516 ret = da9052_bat_check_presence(bat, &val->intval); 517 break; 518 case POWER_SUPPLY_PROP_HEALTH: 519 ret = da9052_bat_check_health(bat, &val->intval); 520 break; 521 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 522 val->intval = DA9052_BAT_CUTOFF_VOLT * 1000; 523 break; 524 case POWER_SUPPLY_PROP_VOLTAGE_AVG: 525 ret = da9052_bat_read_volt(bat, &val->intval); 526 break; 527 case POWER_SUPPLY_PROP_CURRENT_AVG: 528 ret = da9052_read_chg_current(bat, &val->intval); 529 break; 530 case POWER_SUPPLY_PROP_CAPACITY: 531 ret = da9052_bat_read_capacity(bat, &val->intval); 532 break; 533 case POWER_SUPPLY_PROP_TEMP: 534 val->intval = da9052_adc_read_temp(bat->da9052); 535 ret = val->intval; 536 break; 537 case POWER_SUPPLY_PROP_TECHNOLOGY: 538 val->intval = POWER_SUPPLY_TECHNOLOGY_LION; 539 break; 540 default: 541 return -EINVAL; 542 } 543 return ret; 544 } 545 546 static enum power_supply_property da9052_bat_props[] = { 547 POWER_SUPPLY_PROP_STATUS, 548 POWER_SUPPLY_PROP_ONLINE, 549 POWER_SUPPLY_PROP_PRESENT, 550 POWER_SUPPLY_PROP_HEALTH, 551 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 552 POWER_SUPPLY_PROP_VOLTAGE_AVG, 553 POWER_SUPPLY_PROP_CURRENT_AVG, 554 POWER_SUPPLY_PROP_CAPACITY, 555 POWER_SUPPLY_PROP_TEMP, 556 POWER_SUPPLY_PROP_TECHNOLOGY, 557 }; 558 559 static struct power_supply_desc psy_desc = { 560 .name = "da9052-bat", 561 .type = POWER_SUPPLY_TYPE_BATTERY, 562 .properties = da9052_bat_props, 563 .num_properties = ARRAY_SIZE(da9052_bat_props), 564 .get_property = da9052_bat_get_property, 565 }; 566 567 static char *da9052_bat_irqs[] = { 568 "BATT TEMP", 569 "DCIN DET", 570 "DCIN REM", 571 "VBUS DET", 572 "VBUS REM", 573 "CHG END", 574 }; 575 576 static int da9052_bat_irq_bits[] = { 577 DA9052_IRQ_TBAT, 578 DA9052_IRQ_DCIN, 579 DA9052_IRQ_DCINREM, 580 DA9052_IRQ_VBUS, 581 DA9052_IRQ_VBUSREM, 582 DA9052_IRQ_CHGEND, 583 }; 584 585 static s32 da9052_bat_probe(struct platform_device *pdev) 586 { 587 struct da9052_pdata *pdata; 588 struct da9052_battery *bat; 589 struct power_supply_config psy_cfg = {}; 590 int ret; 591 int i; 592 593 bat = devm_kzalloc(&pdev->dev, sizeof(struct da9052_battery), 594 GFP_KERNEL); 595 if (!bat) 596 return -ENOMEM; 597 598 psy_cfg.drv_data = bat; 599 600 bat->da9052 = dev_get_drvdata(pdev->dev.parent); 601 bat->charger_type = DA9052_NOCHARGER; 602 bat->status = POWER_SUPPLY_STATUS_UNKNOWN; 603 bat->health = POWER_SUPPLY_HEALTH_UNKNOWN; 604 bat->nb.notifier_call = da9052_USB_current_notifier; 605 606 pdata = bat->da9052->dev->platform_data; 607 if (pdata != NULL && pdata->use_for_apm) 608 psy_desc.use_for_apm = pdata->use_for_apm; 609 else 610 psy_desc.use_for_apm = 1; 611 612 for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) { 613 ret = da9052_request_irq(bat->da9052, 614 da9052_bat_irq_bits[i], da9052_bat_irqs[i], 615 da9052_bat_irq, bat); 616 617 if (ret != 0) { 618 dev_err(bat->da9052->dev, 619 "DA9052 failed to request %s IRQ: %d\n", 620 da9052_bat_irqs[i], ret); 621 goto err; 622 } 623 } 624 625 bat->psy = devm_power_supply_register(&pdev->dev, &psy_desc, &psy_cfg); 626 if (IS_ERR(bat->psy)) { 627 ret = PTR_ERR(bat->psy); 628 goto err; 629 } 630 631 platform_set_drvdata(pdev, bat); 632 return 0; 633 634 err: 635 while (--i >= 0) 636 da9052_free_irq(bat->da9052, da9052_bat_irq_bits[i], bat); 637 638 return ret; 639 } 640 static void da9052_bat_remove(struct platform_device *pdev) 641 { 642 int i; 643 struct da9052_battery *bat = platform_get_drvdata(pdev); 644 645 for (i = 0; i < ARRAY_SIZE(da9052_bat_irqs); i++) 646 da9052_free_irq(bat->da9052, da9052_bat_irq_bits[i], bat); 647 } 648 649 static struct platform_driver da9052_bat_driver = { 650 .probe = da9052_bat_probe, 651 .remove_new = da9052_bat_remove, 652 .driver = { 653 .name = "da9052-bat", 654 }, 655 }; 656 module_platform_driver(da9052_bat_driver); 657 658 MODULE_DESCRIPTION("DA9052 BAT Device Driver"); 659 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 660 MODULE_LICENSE("GPL"); 661 MODULE_ALIAS("platform:da9052-bat"); 662