1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * TI LP8788 MFD - battery charger driver 4 * 5 * Copyright 2012 Texas Instruments 6 * 7 * Author: Milo(Woogyom) Kim <milo.kim@ti.com> 8 */ 9 10 #include <linux/err.h> 11 #include <linux/iio/consumer.h> 12 #include <linux/interrupt.h> 13 #include <linux/irqdomain.h> 14 #include <linux/mfd/lp8788.h> 15 #include <linux/module.h> 16 #include <linux/platform_device.h> 17 #include <linux/power_supply.h> 18 #include <linux/slab.h> 19 #include <linux/workqueue.h> 20 21 /* register address */ 22 #define LP8788_CHG_STATUS 0x07 23 #define LP8788_CHG_IDCIN 0x13 24 #define LP8788_CHG_IBATT 0x14 25 #define LP8788_CHG_VTERM 0x15 26 #define LP8788_CHG_EOC 0x16 27 28 /* mask/shift bits */ 29 #define LP8788_CHG_INPUT_STATE_M 0x03 /* Addr 07h */ 30 #define LP8788_CHG_STATE_M 0x3C 31 #define LP8788_CHG_STATE_S 2 32 #define LP8788_NO_BATT_M BIT(6) 33 #define LP8788_BAD_BATT_M BIT(7) 34 #define LP8788_CHG_IBATT_M 0x1F /* Addr 14h */ 35 #define LP8788_CHG_VTERM_M 0x0F /* Addr 15h */ 36 #define LP8788_CHG_EOC_LEVEL_M 0x30 /* Addr 16h */ 37 #define LP8788_CHG_EOC_LEVEL_S 4 38 #define LP8788_CHG_EOC_TIME_M 0x0E 39 #define LP8788_CHG_EOC_TIME_S 1 40 #define LP8788_CHG_EOC_MODE_M BIT(0) 41 42 #define LP8788_CHARGER_NAME "charger" 43 #define LP8788_BATTERY_NAME "main_batt" 44 45 #define LP8788_CHG_START 0x11 46 #define LP8788_CHG_END 0x1C 47 48 #define LP8788_ISEL_MAX 23 49 #define LP8788_ISEL_STEP 50 50 #define LP8788_VTERM_MIN 4100 51 #define LP8788_VTERM_STEP 25 52 #define LP8788_MAX_BATT_CAPACITY 100 53 #define LP8788_MAX_CHG_IRQS 11 54 55 enum lp8788_charging_state { 56 LP8788_OFF, 57 LP8788_WARM_UP, 58 LP8788_LOW_INPUT = 0x3, 59 LP8788_PRECHARGE, 60 LP8788_CC, 61 LP8788_CV, 62 LP8788_MAINTENANCE, 63 LP8788_BATTERY_FAULT, 64 LP8788_SYSTEM_SUPPORT = 0xC, 65 LP8788_HIGH_CURRENT = 0xF, 66 LP8788_MAX_CHG_STATE, 67 }; 68 69 enum lp8788_charger_adc_sel { 70 LP8788_VBATT, 71 LP8788_BATT_TEMP, 72 LP8788_NUM_CHG_ADC, 73 }; 74 75 enum lp8788_charger_input_state { 76 LP8788_SYSTEM_SUPPLY = 1, 77 LP8788_FULL_FUNCTION, 78 }; 79 80 /* 81 * struct lp8788_chg_irq 82 * @which : lp8788 interrupt id 83 * @virq : Linux IRQ number from irq_domain 84 */ 85 struct lp8788_chg_irq { 86 enum lp8788_int_id which; 87 int virq; 88 }; 89 90 /* 91 * struct lp8788_charger 92 * @lp : used for accessing the registers of mfd lp8788 device 93 * @charger : power supply driver for the battery charger 94 * @battery : power supply driver for the battery 95 * @charger_work : work queue for charger input interrupts 96 * @chan : iio channels for getting adc values 97 * eg) battery voltage, capacity and temperature 98 * @irqs : charger dedicated interrupts 99 * @num_irqs : total numbers of charger interrupts 100 * @pdata : charger platform specific data 101 */ 102 struct lp8788_charger { 103 struct lp8788 *lp; 104 struct power_supply *charger; 105 struct power_supply *battery; 106 struct work_struct charger_work; 107 struct iio_channel *chan[LP8788_NUM_CHG_ADC]; 108 struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS]; 109 int num_irqs; 110 struct lp8788_charger_platform_data *pdata; 111 }; 112 113 static char *battery_supplied_to[] = { 114 LP8788_BATTERY_NAME, 115 }; 116 117 static enum power_supply_property lp8788_charger_prop[] = { 118 POWER_SUPPLY_PROP_ONLINE, 119 POWER_SUPPLY_PROP_CURRENT_MAX, 120 }; 121 122 static enum power_supply_property lp8788_battery_prop[] = { 123 POWER_SUPPLY_PROP_STATUS, 124 POWER_SUPPLY_PROP_HEALTH, 125 POWER_SUPPLY_PROP_PRESENT, 126 POWER_SUPPLY_PROP_VOLTAGE_NOW, 127 POWER_SUPPLY_PROP_CAPACITY, 128 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, 129 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, 130 POWER_SUPPLY_PROP_TEMP, 131 }; 132 133 static bool lp8788_is_charger_detected(struct lp8788_charger *pchg) 134 { 135 u8 data; 136 137 lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data); 138 data &= LP8788_CHG_INPUT_STATE_M; 139 140 return data == LP8788_SYSTEM_SUPPLY || data == LP8788_FULL_FUNCTION; 141 } 142 143 static int lp8788_charger_get_property(struct power_supply *psy, 144 enum power_supply_property psp, 145 union power_supply_propval *val) 146 { 147 struct lp8788_charger *pchg = dev_get_drvdata(psy->dev.parent); 148 u8 read; 149 150 switch (psp) { 151 case POWER_SUPPLY_PROP_ONLINE: 152 val->intval = lp8788_is_charger_detected(pchg); 153 break; 154 case POWER_SUPPLY_PROP_CURRENT_MAX: 155 lp8788_read_byte(pchg->lp, LP8788_CHG_IDCIN, &read); 156 val->intval = LP8788_ISEL_STEP * 157 (min_t(int, read, LP8788_ISEL_MAX) + 1); 158 break; 159 default: 160 return -EINVAL; 161 } 162 163 return 0; 164 } 165 166 static int lp8788_get_battery_status(struct lp8788_charger *pchg, 167 union power_supply_propval *val) 168 { 169 enum lp8788_charging_state state; 170 u8 data; 171 int ret; 172 173 ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data); 174 if (ret) 175 return ret; 176 177 state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S; 178 switch (state) { 179 case LP8788_OFF: 180 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 181 break; 182 case LP8788_PRECHARGE: 183 case LP8788_CC: 184 case LP8788_CV: 185 case LP8788_HIGH_CURRENT: 186 val->intval = POWER_SUPPLY_STATUS_CHARGING; 187 break; 188 case LP8788_MAINTENANCE: 189 val->intval = POWER_SUPPLY_STATUS_FULL; 190 break; 191 default: 192 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 193 break; 194 } 195 196 return 0; 197 } 198 199 static int lp8788_get_battery_health(struct lp8788_charger *pchg, 200 union power_supply_propval *val) 201 { 202 u8 data; 203 int ret; 204 205 ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data); 206 if (ret) 207 return ret; 208 209 if (data & LP8788_NO_BATT_M) 210 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 211 else if (data & LP8788_BAD_BATT_M) 212 val->intval = POWER_SUPPLY_HEALTH_DEAD; 213 else 214 val->intval = POWER_SUPPLY_HEALTH_GOOD; 215 216 return 0; 217 } 218 219 static int lp8788_get_battery_present(struct lp8788_charger *pchg, 220 union power_supply_propval *val) 221 { 222 u8 data; 223 int ret; 224 225 ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data); 226 if (ret) 227 return ret; 228 229 val->intval = !(data & LP8788_NO_BATT_M); 230 return 0; 231 } 232 233 static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg, int *result) 234 { 235 struct iio_channel *channel = pchg->chan[LP8788_VBATT]; 236 237 if (!channel) 238 return -EINVAL; 239 240 return iio_read_channel_processed(channel, result); 241 } 242 243 static int lp8788_get_battery_voltage(struct lp8788_charger *pchg, 244 union power_supply_propval *val) 245 { 246 return lp8788_get_vbatt_adc(pchg, &val->intval); 247 } 248 249 static int lp8788_get_battery_capacity(struct lp8788_charger *pchg, 250 union power_supply_propval *val) 251 { 252 struct lp8788 *lp = pchg->lp; 253 struct lp8788_charger_platform_data *pdata = pchg->pdata; 254 unsigned int max_vbatt; 255 int vbatt; 256 enum lp8788_charging_state state; 257 u8 data; 258 int ret; 259 260 if (!pdata) 261 return -EINVAL; 262 263 max_vbatt = pdata->max_vbatt_mv; 264 if (max_vbatt == 0) 265 return -EINVAL; 266 267 ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data); 268 if (ret) 269 return ret; 270 271 state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S; 272 273 if (state == LP8788_MAINTENANCE) { 274 val->intval = LP8788_MAX_BATT_CAPACITY; 275 } else { 276 ret = lp8788_get_vbatt_adc(pchg, &vbatt); 277 if (ret) 278 return ret; 279 280 val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt; 281 val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY); 282 } 283 284 return 0; 285 } 286 287 static int lp8788_get_battery_temperature(struct lp8788_charger *pchg, 288 union power_supply_propval *val) 289 { 290 struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP]; 291 int result; 292 int ret; 293 294 if (!channel) 295 return -EINVAL; 296 297 ret = iio_read_channel_processed(channel, &result); 298 if (ret < 0) 299 return -EINVAL; 300 301 /* unit: 0.1 'C */ 302 val->intval = result * 10; 303 304 return 0; 305 } 306 307 static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg, 308 union power_supply_propval *val) 309 { 310 u8 read; 311 312 lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read); 313 read &= LP8788_CHG_IBATT_M; 314 val->intval = LP8788_ISEL_STEP * 315 (min_t(int, read, LP8788_ISEL_MAX) + 1); 316 317 return 0; 318 } 319 320 static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg, 321 union power_supply_propval *val) 322 { 323 u8 read; 324 325 lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read); 326 read &= LP8788_CHG_VTERM_M; 327 val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read; 328 329 return 0; 330 } 331 332 static int lp8788_battery_get_property(struct power_supply *psy, 333 enum power_supply_property psp, 334 union power_supply_propval *val) 335 { 336 struct lp8788_charger *pchg = dev_get_drvdata(psy->dev.parent); 337 338 switch (psp) { 339 case POWER_SUPPLY_PROP_STATUS: 340 return lp8788_get_battery_status(pchg, val); 341 case POWER_SUPPLY_PROP_HEALTH: 342 return lp8788_get_battery_health(pchg, val); 343 case POWER_SUPPLY_PROP_PRESENT: 344 return lp8788_get_battery_present(pchg, val); 345 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 346 return lp8788_get_battery_voltage(pchg, val); 347 case POWER_SUPPLY_PROP_CAPACITY: 348 return lp8788_get_battery_capacity(pchg, val); 349 case POWER_SUPPLY_PROP_TEMP: 350 return lp8788_get_battery_temperature(pchg, val); 351 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: 352 return lp8788_get_battery_charging_current(pchg, val); 353 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: 354 return lp8788_get_charging_termination_voltage(pchg, val); 355 default: 356 return -EINVAL; 357 } 358 } 359 360 static inline bool lp8788_is_valid_charger_register(u8 addr) 361 { 362 return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END; 363 } 364 365 static int lp8788_update_charger_params(struct platform_device *pdev, 366 struct lp8788_charger *pchg) 367 { 368 struct lp8788 *lp = pchg->lp; 369 struct lp8788_charger_platform_data *pdata = pchg->pdata; 370 struct lp8788_chg_param *param; 371 int i; 372 int ret; 373 374 if (!pdata || !pdata->chg_params) { 375 dev_info(&pdev->dev, "skip updating charger parameters\n"); 376 return 0; 377 } 378 379 /* settting charging parameters */ 380 for (i = 0; i < pdata->num_chg_params; i++) { 381 param = pdata->chg_params + i; 382 383 if (lp8788_is_valid_charger_register(param->addr)) { 384 ret = lp8788_write_byte(lp, param->addr, param->val); 385 if (ret) 386 return ret; 387 } 388 } 389 390 return 0; 391 } 392 393 static const struct power_supply_desc lp8788_psy_charger_desc = { 394 .name = LP8788_CHARGER_NAME, 395 .type = POWER_SUPPLY_TYPE_MAINS, 396 .properties = lp8788_charger_prop, 397 .num_properties = ARRAY_SIZE(lp8788_charger_prop), 398 .get_property = lp8788_charger_get_property, 399 }; 400 401 static const struct power_supply_desc lp8788_psy_battery_desc = { 402 .name = LP8788_BATTERY_NAME, 403 .type = POWER_SUPPLY_TYPE_BATTERY, 404 .properties = lp8788_battery_prop, 405 .num_properties = ARRAY_SIZE(lp8788_battery_prop), 406 .get_property = lp8788_battery_get_property, 407 }; 408 409 static void lp8788_psy_unregister(struct lp8788_charger *pchg) 410 { 411 power_supply_unregister(pchg->battery); 412 power_supply_unregister(pchg->charger); 413 } 414 415 static void lp8788_charger_event(struct work_struct *work) 416 { 417 struct lp8788_charger *pchg = 418 container_of(work, struct lp8788_charger, charger_work); 419 struct lp8788_charger_platform_data *pdata = pchg->pdata; 420 enum lp8788_charger_event event = lp8788_is_charger_detected(pchg); 421 422 pdata->charger_event(pchg->lp, event); 423 } 424 425 static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id) 426 { 427 bool found = false; 428 int i; 429 430 for (i = 0; i < pchg->num_irqs; i++) { 431 if (pchg->irqs[i].virq == virq) { 432 *id = pchg->irqs[i].which; 433 found = true; 434 break; 435 } 436 } 437 438 return found; 439 } 440 441 static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr) 442 { 443 struct lp8788_charger *pchg = ptr; 444 struct lp8788_charger_platform_data *pdata = pchg->pdata; 445 int id = -1; 446 447 if (!lp8788_find_irq_id(pchg, virq, &id)) 448 return IRQ_NONE; 449 450 switch (id) { 451 case LP8788_INT_CHG_INPUT_STATE: 452 case LP8788_INT_CHG_STATE: 453 case LP8788_INT_EOC: 454 case LP8788_INT_BATT_LOW: 455 case LP8788_INT_NO_BATT: 456 power_supply_changed(pchg->charger); 457 power_supply_changed(pchg->battery); 458 break; 459 default: 460 break; 461 } 462 463 /* report charger dectection event if used */ 464 if (!pdata) 465 goto irq_handled; 466 467 if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE) 468 schedule_work(&pchg->charger_work); 469 470 irq_handled: 471 return IRQ_HANDLED; 472 } 473 474 static int lp8788_set_irqs(struct platform_device *pdev, 475 struct lp8788_charger *pchg, const char *name) 476 { 477 struct resource *r; 478 struct irq_domain *irqdm = pchg->lp->irqdm; 479 int irq_start; 480 int irq_end; 481 int virq; 482 int nr_irq; 483 int i; 484 int ret; 485 486 /* no error even if no irq resource */ 487 r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name); 488 if (!r) 489 return 0; 490 491 irq_start = r->start; 492 irq_end = r->end; 493 494 for (i = irq_start; i <= irq_end; i++) { 495 nr_irq = pchg->num_irqs; 496 497 virq = irq_create_mapping(irqdm, i); 498 pchg->irqs[nr_irq].virq = virq; 499 pchg->irqs[nr_irq].which = i; 500 pchg->num_irqs++; 501 502 ret = request_threaded_irq(virq, NULL, 503 lp8788_charger_irq_thread, 504 IRQF_ONESHOT, name, pchg); 505 if (ret) 506 break; 507 } 508 509 if (i <= irq_end) 510 goto err_free_irq; 511 512 return 0; 513 514 err_free_irq: 515 for (i = 0; i < pchg->num_irqs; i++) 516 free_irq(pchg->irqs[i].virq, pchg); 517 return ret; 518 } 519 520 static int lp8788_irq_register(struct platform_device *pdev, 521 struct lp8788_charger *pchg) 522 { 523 const char *name[] = { 524 LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ 525 }; 526 int i; 527 int ret; 528 529 INIT_WORK(&pchg->charger_work, lp8788_charger_event); 530 pchg->num_irqs = 0; 531 532 for (i = 0; i < ARRAY_SIZE(name); i++) { 533 ret = lp8788_set_irqs(pdev, pchg, name[i]); 534 if (ret) { 535 dev_warn(&pdev->dev, "irq setup failed: %s\n", name[i]); 536 return ret; 537 } 538 } 539 540 if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) { 541 dev_err(&pdev->dev, "invalid total number of irqs: %d\n", 542 pchg->num_irqs); 543 return -EINVAL; 544 } 545 546 547 return 0; 548 } 549 550 static void lp8788_irq_unregister(struct platform_device *pdev, 551 struct lp8788_charger *pchg) 552 { 553 int i; 554 int irq; 555 556 for (i = 0; i < pchg->num_irqs; i++) { 557 irq = pchg->irqs[i].virq; 558 if (!irq) 559 continue; 560 561 free_irq(irq, pchg); 562 } 563 } 564 565 static void lp8788_setup_adc_channel(struct device *dev, 566 struct lp8788_charger *pchg) 567 { 568 struct lp8788_charger_platform_data *pdata = pchg->pdata; 569 struct iio_channel *chan; 570 571 if (!pdata) 572 return; 573 574 /* ADC channel for battery voltage */ 575 chan = devm_iio_channel_get(dev, pdata->adc_vbatt); 576 pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan; 577 578 /* ADC channel for battery temperature */ 579 chan = devm_iio_channel_get(dev, pdata->adc_batt_temp); 580 pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan; 581 } 582 583 static ssize_t lp8788_show_charger_status(struct device *dev, 584 struct device_attribute *attr, char *buf) 585 { 586 struct lp8788_charger *pchg = dev_get_drvdata(dev); 587 enum lp8788_charging_state state; 588 static const char * const desc[LP8788_MAX_CHG_STATE] = { 589 [LP8788_OFF] = "CHARGER OFF", 590 [LP8788_WARM_UP] = "WARM UP", 591 [LP8788_LOW_INPUT] = "LOW INPUT STATE", 592 [LP8788_PRECHARGE] = "CHARGING - PRECHARGE", 593 [LP8788_CC] = "CHARGING - CC", 594 [LP8788_CV] = "CHARGING - CV", 595 [LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE", 596 [LP8788_BATTERY_FAULT] = "BATTERY FAULT", 597 [LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT", 598 [LP8788_HIGH_CURRENT] = "HIGH CURRENT", 599 }; 600 u8 data; 601 602 lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data); 603 state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S; 604 605 return scnprintf(buf, PAGE_SIZE, "%s\n", desc[state]); 606 } 607 608 static ssize_t lp8788_show_eoc_time(struct device *dev, 609 struct device_attribute *attr, char *buf) 610 { 611 struct lp8788_charger *pchg = dev_get_drvdata(dev); 612 static const char * const stime[] = { 613 "400ms", "5min", "10min", "15min", 614 "20min", "25min", "30min", "No timeout" 615 }; 616 u8 val; 617 618 lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val); 619 val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S; 620 621 return scnprintf(buf, PAGE_SIZE, "End Of Charge Time: %s\n", 622 stime[val]); 623 } 624 625 static ssize_t lp8788_show_eoc_level(struct device *dev, 626 struct device_attribute *attr, char *buf) 627 { 628 struct lp8788_charger *pchg = dev_get_drvdata(dev); 629 static const char * const abs_level[] = { 630 "25mA", "49mA", "75mA", "98mA" 631 }; 632 static const char * const relative_level[] = { 633 "5%", "10%", "15%", "20%" 634 }; 635 const char *level; 636 u8 val; 637 u8 mode; 638 639 lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val); 640 641 mode = val & LP8788_CHG_EOC_MODE_M; 642 val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S; 643 level = mode ? abs_level[val] : relative_level[val]; 644 645 return scnprintf(buf, PAGE_SIZE, "End Of Charge Level: %s\n", level); 646 } 647 648 static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL); 649 static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL); 650 static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL); 651 652 static struct attribute *lp8788_charger_sysfs_attrs[] = { 653 &dev_attr_charger_status.attr, 654 &dev_attr_eoc_time.attr, 655 &dev_attr_eoc_level.attr, 656 NULL, 657 }; 658 659 ATTRIBUTE_GROUPS(lp8788_charger_sysfs); 660 661 static int lp8788_psy_register(struct platform_device *pdev, 662 struct lp8788_charger *pchg) 663 { 664 struct power_supply_config charger_cfg = {}; 665 666 charger_cfg.attr_grp = lp8788_charger_sysfs_groups; 667 charger_cfg.supplied_to = battery_supplied_to; 668 charger_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to); 669 670 pchg->charger = power_supply_register(&pdev->dev, 671 &lp8788_psy_charger_desc, 672 &charger_cfg); 673 if (IS_ERR(pchg->charger)) 674 return -EPERM; 675 676 pchg->battery = power_supply_register(&pdev->dev, 677 &lp8788_psy_battery_desc, NULL); 678 if (IS_ERR(pchg->battery)) { 679 power_supply_unregister(pchg->charger); 680 return -EPERM; 681 } 682 683 return 0; 684 } 685 686 static int lp8788_charger_probe(struct platform_device *pdev) 687 { 688 struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent); 689 struct lp8788_charger *pchg; 690 struct device *dev = &pdev->dev; 691 int ret; 692 693 pchg = devm_kzalloc(dev, sizeof(struct lp8788_charger), GFP_KERNEL); 694 if (!pchg) 695 return -ENOMEM; 696 697 pchg->lp = lp; 698 pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL; 699 platform_set_drvdata(pdev, pchg); 700 701 ret = lp8788_update_charger_params(pdev, pchg); 702 if (ret) 703 return ret; 704 705 lp8788_setup_adc_channel(&pdev->dev, pchg); 706 707 ret = lp8788_psy_register(pdev, pchg); 708 if (ret) 709 return ret; 710 711 ret = lp8788_irq_register(pdev, pchg); 712 if (ret) 713 dev_warn(dev, "failed to register charger irq: %d\n", ret); 714 715 return 0; 716 } 717 718 static int lp8788_charger_remove(struct platform_device *pdev) 719 { 720 struct lp8788_charger *pchg = platform_get_drvdata(pdev); 721 722 flush_work(&pchg->charger_work); 723 lp8788_irq_unregister(pdev, pchg); 724 lp8788_psy_unregister(pchg); 725 726 return 0; 727 } 728 729 static struct platform_driver lp8788_charger_driver = { 730 .probe = lp8788_charger_probe, 731 .remove = lp8788_charger_remove, 732 .driver = { 733 .name = LP8788_DEV_CHARGER, 734 }, 735 }; 736 module_platform_driver(lp8788_charger_driver); 737 738 MODULE_DESCRIPTION("TI LP8788 Charger Driver"); 739 MODULE_AUTHOR("Milo Kim"); 740 MODULE_LICENSE("GPL"); 741 MODULE_ALIAS("platform:lp8788-charger"); 742