1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Driver for LP8727 Micro/Mini USB IC with integrated charger 4 * 5 * Copyright (C) 2011 Texas Instruments 6 * Copyright (C) 2011 National Semiconductor 7 */ 8 9 #include <linux/module.h> 10 #include <linux/slab.h> 11 #include <linux/interrupt.h> 12 #include <linux/i2c.h> 13 #include <linux/power_supply.h> 14 #include <linux/platform_data/lp8727.h> 15 #include <linux/of.h> 16 17 #define LP8788_NUM_INTREGS 2 18 #define DEFAULT_DEBOUNCE_MSEC 270 19 20 /* Registers */ 21 #define LP8727_CTRL1 0x1 22 #define LP8727_CTRL2 0x2 23 #define LP8727_SWCTRL 0x3 24 #define LP8727_INT1 0x4 25 #define LP8727_INT2 0x5 26 #define LP8727_STATUS1 0x6 27 #define LP8727_STATUS2 0x7 28 #define LP8727_CHGCTRL2 0x9 29 30 /* CTRL1 register */ 31 #define LP8727_CP_EN BIT(0) 32 #define LP8727_ADC_EN BIT(1) 33 #define LP8727_ID200_EN BIT(4) 34 35 /* CTRL2 register */ 36 #define LP8727_CHGDET_EN BIT(1) 37 #define LP8727_INT_EN BIT(6) 38 39 /* SWCTRL register */ 40 #define LP8727_SW_DM1_DM (0x0 << 0) 41 #define LP8727_SW_DM1_HiZ (0x7 << 0) 42 #define LP8727_SW_DP2_DP (0x0 << 3) 43 #define LP8727_SW_DP2_HiZ (0x7 << 3) 44 45 /* INT1 register */ 46 #define LP8727_IDNO (0xF << 0) 47 #define LP8727_VBUS BIT(4) 48 49 /* STATUS1 register */ 50 #define LP8727_CHGSTAT (3 << 4) 51 #define LP8727_CHPORT BIT(6) 52 #define LP8727_DCPORT BIT(7) 53 #define LP8727_STAT_EOC 0x30 54 55 /* STATUS2 register */ 56 #define LP8727_TEMP_STAT (3 << 5) 57 #define LP8727_TEMP_SHIFT 5 58 59 /* CHGCTRL2 register */ 60 #define LP8727_ICHG_SHIFT 4 61 62 enum lp8727_dev_id { 63 LP8727_ID_NONE, 64 LP8727_ID_TA, 65 LP8727_ID_DEDICATED_CHG, 66 LP8727_ID_USB_CHG, 67 LP8727_ID_USB_DS, 68 LP8727_ID_MAX, 69 }; 70 71 enum lp8727_die_temp { 72 LP8788_TEMP_75C, 73 LP8788_TEMP_95C, 74 LP8788_TEMP_115C, 75 LP8788_TEMP_135C, 76 }; 77 78 struct lp8727_psy { 79 struct power_supply *ac; 80 struct power_supply *usb; 81 struct power_supply *batt; 82 }; 83 84 struct lp8727_chg { 85 struct device *dev; 86 struct i2c_client *client; 87 struct mutex xfer_lock; 88 struct lp8727_psy *psy; 89 struct lp8727_platform_data *pdata; 90 91 /* Charger Data */ 92 enum lp8727_dev_id devid; 93 struct lp8727_chg_param *chg_param; 94 95 /* Interrupt Handling */ 96 int irq; 97 struct delayed_work work; 98 unsigned long debounce_jiffies; 99 }; 100 101 static int lp8727_read_bytes(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len) 102 { 103 s32 ret; 104 105 mutex_lock(&pchg->xfer_lock); 106 ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data); 107 mutex_unlock(&pchg->xfer_lock); 108 109 return (ret != len) ? -EIO : 0; 110 } 111 112 static inline int lp8727_read_byte(struct lp8727_chg *pchg, u8 reg, u8 *data) 113 { 114 return lp8727_read_bytes(pchg, reg, data, 1); 115 } 116 117 static int lp8727_write_byte(struct lp8727_chg *pchg, u8 reg, u8 data) 118 { 119 int ret; 120 121 mutex_lock(&pchg->xfer_lock); 122 ret = i2c_smbus_write_byte_data(pchg->client, reg, data); 123 mutex_unlock(&pchg->xfer_lock); 124 125 return ret; 126 } 127 128 static bool lp8727_is_charger_attached(const char *name, int id) 129 { 130 if (!strcmp(name, "ac")) 131 return id == LP8727_ID_TA || id == LP8727_ID_DEDICATED_CHG; 132 else if (!strcmp(name, "usb")) 133 return id == LP8727_ID_USB_CHG; 134 135 return id >= LP8727_ID_TA && id <= LP8727_ID_USB_CHG; 136 } 137 138 static int lp8727_init_device(struct lp8727_chg *pchg) 139 { 140 u8 val; 141 int ret; 142 u8 intstat[LP8788_NUM_INTREGS]; 143 144 /* clear interrupts */ 145 ret = lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS); 146 if (ret) 147 return ret; 148 149 val = LP8727_ID200_EN | LP8727_ADC_EN | LP8727_CP_EN; 150 ret = lp8727_write_byte(pchg, LP8727_CTRL1, val); 151 if (ret) 152 return ret; 153 154 val = LP8727_INT_EN | LP8727_CHGDET_EN; 155 return lp8727_write_byte(pchg, LP8727_CTRL2, val); 156 } 157 158 static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg) 159 { 160 u8 val; 161 162 lp8727_read_byte(pchg, LP8727_STATUS1, &val); 163 return val & LP8727_DCPORT; 164 } 165 166 static int lp8727_is_usb_charger(struct lp8727_chg *pchg) 167 { 168 u8 val; 169 170 lp8727_read_byte(pchg, LP8727_STATUS1, &val); 171 return val & LP8727_CHPORT; 172 } 173 174 static inline void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw) 175 { 176 lp8727_write_byte(pchg, LP8727_SWCTRL, sw); 177 } 178 179 static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin) 180 { 181 struct lp8727_platform_data *pdata = pchg->pdata; 182 u8 devid = LP8727_ID_NONE; 183 u8 swctrl = LP8727_SW_DM1_HiZ | LP8727_SW_DP2_HiZ; 184 185 switch (id) { 186 case 0x5: 187 devid = LP8727_ID_TA; 188 pchg->chg_param = pdata ? pdata->ac : NULL; 189 break; 190 case 0xB: 191 if (lp8727_is_dedicated_charger(pchg)) { 192 pchg->chg_param = pdata ? pdata->ac : NULL; 193 devid = LP8727_ID_DEDICATED_CHG; 194 } else if (lp8727_is_usb_charger(pchg)) { 195 pchg->chg_param = pdata ? pdata->usb : NULL; 196 devid = LP8727_ID_USB_CHG; 197 swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP; 198 } else if (vbusin) { 199 devid = LP8727_ID_USB_DS; 200 swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP; 201 } 202 break; 203 default: 204 devid = LP8727_ID_NONE; 205 pchg->chg_param = NULL; 206 break; 207 } 208 209 pchg->devid = devid; 210 lp8727_ctrl_switch(pchg, swctrl); 211 } 212 213 static void lp8727_enable_chgdet(struct lp8727_chg *pchg) 214 { 215 u8 val; 216 217 lp8727_read_byte(pchg, LP8727_CTRL2, &val); 218 val |= LP8727_CHGDET_EN; 219 lp8727_write_byte(pchg, LP8727_CTRL2, val); 220 } 221 222 static void lp8727_delayed_func(struct work_struct *_work) 223 { 224 struct lp8727_chg *pchg = container_of(_work, struct lp8727_chg, 225 work.work); 226 u8 intstat[LP8788_NUM_INTREGS]; 227 u8 idno; 228 u8 vbus; 229 230 if (lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS)) { 231 dev_err(pchg->dev, "can not read INT registers\n"); 232 return; 233 } 234 235 idno = intstat[0] & LP8727_IDNO; 236 vbus = intstat[0] & LP8727_VBUS; 237 238 lp8727_id_detection(pchg, idno, vbus); 239 lp8727_enable_chgdet(pchg); 240 241 power_supply_changed(pchg->psy->ac); 242 power_supply_changed(pchg->psy->usb); 243 power_supply_changed(pchg->psy->batt); 244 } 245 246 static irqreturn_t lp8727_isr_func(int irq, void *ptr) 247 { 248 struct lp8727_chg *pchg = ptr; 249 250 schedule_delayed_work(&pchg->work, pchg->debounce_jiffies); 251 return IRQ_HANDLED; 252 } 253 254 static int lp8727_setup_irq(struct lp8727_chg *pchg) 255 { 256 int ret; 257 int irq = pchg->client->irq; 258 unsigned delay_msec = pchg->pdata ? pchg->pdata->debounce_msec : 259 DEFAULT_DEBOUNCE_MSEC; 260 261 INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func); 262 263 if (irq <= 0) { 264 dev_warn(pchg->dev, "invalid irq number: %d\n", irq); 265 return 0; 266 } 267 268 ret = request_threaded_irq(irq, NULL, lp8727_isr_func, 269 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 270 "lp8727_irq", pchg); 271 272 if (ret) 273 return ret; 274 275 pchg->irq = irq; 276 pchg->debounce_jiffies = msecs_to_jiffies(delay_msec); 277 278 return 0; 279 } 280 281 static void lp8727_release_irq(struct lp8727_chg *pchg) 282 { 283 cancel_delayed_work_sync(&pchg->work); 284 285 if (pchg->irq) 286 free_irq(pchg->irq, pchg); 287 } 288 289 static enum power_supply_property lp8727_charger_prop[] = { 290 POWER_SUPPLY_PROP_ONLINE, 291 }; 292 293 static enum power_supply_property lp8727_battery_prop[] = { 294 POWER_SUPPLY_PROP_STATUS, 295 POWER_SUPPLY_PROP_HEALTH, 296 POWER_SUPPLY_PROP_PRESENT, 297 POWER_SUPPLY_PROP_VOLTAGE_NOW, 298 POWER_SUPPLY_PROP_CAPACITY, 299 POWER_SUPPLY_PROP_TEMP, 300 }; 301 302 static char *battery_supplied_to[] = { 303 "main_batt", 304 }; 305 306 static int lp8727_charger_get_property(struct power_supply *psy, 307 enum power_supply_property psp, 308 union power_supply_propval *val) 309 { 310 struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent); 311 312 if (psp != POWER_SUPPLY_PROP_ONLINE) 313 return -EINVAL; 314 315 val->intval = lp8727_is_charger_attached(psy->desc->name, pchg->devid); 316 317 return 0; 318 } 319 320 static bool lp8727_is_high_temperature(enum lp8727_die_temp temp) 321 { 322 switch (temp) { 323 case LP8788_TEMP_95C: 324 case LP8788_TEMP_115C: 325 case LP8788_TEMP_135C: 326 return true; 327 default: 328 return false; 329 } 330 } 331 332 static int lp8727_battery_get_property(struct power_supply *psy, 333 enum power_supply_property psp, 334 union power_supply_propval *val) 335 { 336 struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent); 337 struct lp8727_platform_data *pdata = pchg->pdata; 338 enum lp8727_die_temp temp; 339 u8 read; 340 341 switch (psp) { 342 case POWER_SUPPLY_PROP_STATUS: 343 if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid)) { 344 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 345 return 0; 346 } 347 348 lp8727_read_byte(pchg, LP8727_STATUS1, &read); 349 350 val->intval = (read & LP8727_CHGSTAT) == LP8727_STAT_EOC ? 351 POWER_SUPPLY_STATUS_FULL : 352 POWER_SUPPLY_STATUS_CHARGING; 353 break; 354 case POWER_SUPPLY_PROP_HEALTH: 355 lp8727_read_byte(pchg, LP8727_STATUS2, &read); 356 temp = (read & LP8727_TEMP_STAT) >> LP8727_TEMP_SHIFT; 357 358 val->intval = lp8727_is_high_temperature(temp) ? 359 POWER_SUPPLY_HEALTH_OVERHEAT : 360 POWER_SUPPLY_HEALTH_GOOD; 361 break; 362 case POWER_SUPPLY_PROP_PRESENT: 363 if (!pdata) 364 return -EINVAL; 365 366 if (pdata->get_batt_present) 367 val->intval = pdata->get_batt_present(); 368 break; 369 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 370 if (!pdata) 371 return -EINVAL; 372 373 if (pdata->get_batt_level) 374 val->intval = pdata->get_batt_level(); 375 break; 376 case POWER_SUPPLY_PROP_CAPACITY: 377 if (!pdata) 378 return -EINVAL; 379 380 if (pdata->get_batt_capacity) 381 val->intval = pdata->get_batt_capacity(); 382 break; 383 case POWER_SUPPLY_PROP_TEMP: 384 if (!pdata) 385 return -EINVAL; 386 387 if (pdata->get_batt_temp) 388 val->intval = pdata->get_batt_temp(); 389 break; 390 default: 391 break; 392 } 393 394 return 0; 395 } 396 397 static void lp8727_charger_changed(struct power_supply *psy) 398 { 399 struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent); 400 u8 eoc_level; 401 u8 ichg; 402 u8 val; 403 404 /* skip if no charger exists */ 405 if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid)) 406 return; 407 408 /* update charging parameters */ 409 if (pchg->chg_param) { 410 eoc_level = pchg->chg_param->eoc_level; 411 ichg = pchg->chg_param->ichg; 412 val = (ichg << LP8727_ICHG_SHIFT) | eoc_level; 413 lp8727_write_byte(pchg, LP8727_CHGCTRL2, val); 414 } 415 } 416 417 static const struct power_supply_desc lp8727_ac_desc = { 418 .name = "ac", 419 .type = POWER_SUPPLY_TYPE_MAINS, 420 .properties = lp8727_charger_prop, 421 .num_properties = ARRAY_SIZE(lp8727_charger_prop), 422 .get_property = lp8727_charger_get_property, 423 }; 424 425 static const struct power_supply_desc lp8727_usb_desc = { 426 .name = "usb", 427 .type = POWER_SUPPLY_TYPE_USB, 428 .properties = lp8727_charger_prop, 429 .num_properties = ARRAY_SIZE(lp8727_charger_prop), 430 .get_property = lp8727_charger_get_property, 431 }; 432 433 static const struct power_supply_desc lp8727_batt_desc = { 434 .name = "main_batt", 435 .type = POWER_SUPPLY_TYPE_BATTERY, 436 .properties = lp8727_battery_prop, 437 .num_properties = ARRAY_SIZE(lp8727_battery_prop), 438 .get_property = lp8727_battery_get_property, 439 .external_power_changed = lp8727_charger_changed, 440 }; 441 442 static int lp8727_register_psy(struct lp8727_chg *pchg) 443 { 444 struct power_supply_config psy_cfg = {}; /* Only for ac and usb */ 445 struct lp8727_psy *psy; 446 447 psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL); 448 if (!psy) 449 return -ENOMEM; 450 451 pchg->psy = psy; 452 453 psy_cfg.supplied_to = battery_supplied_to; 454 psy_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to); 455 456 psy->ac = devm_power_supply_register(pchg->dev, &lp8727_ac_desc, &psy_cfg); 457 if (IS_ERR(psy->ac)) 458 return -EPERM; 459 460 psy->usb = devm_power_supply_register(pchg->dev, &lp8727_usb_desc, 461 &psy_cfg); 462 if (IS_ERR(psy->usb)) 463 return -EPERM; 464 465 psy->batt = devm_power_supply_register(pchg->dev, &lp8727_batt_desc, NULL); 466 if (IS_ERR(psy->batt)) 467 return -EPERM; 468 469 return 0; 470 } 471 472 #ifdef CONFIG_OF 473 static struct lp8727_chg_param 474 *lp8727_parse_charge_pdata(struct device *dev, struct device_node *np) 475 { 476 struct lp8727_chg_param *param; 477 478 param = devm_kzalloc(dev, sizeof(*param), GFP_KERNEL); 479 if (!param) 480 goto out; 481 482 of_property_read_u8(np, "eoc-level", (u8 *)¶m->eoc_level); 483 of_property_read_u8(np, "charging-current", (u8 *)¶m->ichg); 484 out: 485 return param; 486 } 487 488 static struct lp8727_platform_data *lp8727_parse_dt(struct device *dev) 489 { 490 struct device_node *np = dev->of_node; 491 struct device_node *child; 492 struct lp8727_platform_data *pdata; 493 const char *type; 494 495 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 496 if (!pdata) 497 return ERR_PTR(-ENOMEM); 498 499 of_property_read_u32(np, "debounce-ms", &pdata->debounce_msec); 500 501 /* If charging parameter is not defined, just skip parsing the dt */ 502 if (of_get_child_count(np) == 0) 503 return pdata; 504 505 for_each_child_of_node(np, child) { 506 of_property_read_string(child, "charger-type", &type); 507 508 if (!strcmp(type, "ac")) 509 pdata->ac = lp8727_parse_charge_pdata(dev, child); 510 511 if (!strcmp(type, "usb")) 512 pdata->usb = lp8727_parse_charge_pdata(dev, child); 513 } 514 515 return pdata; 516 } 517 #else 518 static struct lp8727_platform_data *lp8727_parse_dt(struct device *dev) 519 { 520 return NULL; 521 } 522 #endif 523 524 static int lp8727_probe(struct i2c_client *cl) 525 { 526 struct lp8727_chg *pchg; 527 struct lp8727_platform_data *pdata; 528 int ret; 529 530 if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) 531 return -EIO; 532 533 if (cl->dev.of_node) { 534 pdata = lp8727_parse_dt(&cl->dev); 535 if (IS_ERR(pdata)) 536 return PTR_ERR(pdata); 537 } else { 538 pdata = dev_get_platdata(&cl->dev); 539 } 540 541 pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL); 542 if (!pchg) 543 return -ENOMEM; 544 545 pchg->client = cl; 546 pchg->dev = &cl->dev; 547 pchg->pdata = pdata; 548 i2c_set_clientdata(cl, pchg); 549 550 mutex_init(&pchg->xfer_lock); 551 552 ret = lp8727_init_device(pchg); 553 if (ret) { 554 dev_err(pchg->dev, "i2c communication err: %d", ret); 555 return ret; 556 } 557 558 ret = lp8727_register_psy(pchg); 559 if (ret) { 560 dev_err(pchg->dev, "power supplies register err: %d", ret); 561 return ret; 562 } 563 564 ret = lp8727_setup_irq(pchg); 565 if (ret) { 566 dev_err(pchg->dev, "irq handler err: %d", ret); 567 return ret; 568 } 569 570 return 0; 571 } 572 573 static void lp8727_remove(struct i2c_client *cl) 574 { 575 struct lp8727_chg *pchg = i2c_get_clientdata(cl); 576 577 lp8727_release_irq(pchg); 578 } 579 580 static const struct of_device_id lp8727_dt_ids[] __maybe_unused = { 581 { .compatible = "ti,lp8727", }, 582 { } 583 }; 584 MODULE_DEVICE_TABLE(of, lp8727_dt_ids); 585 586 static const struct i2c_device_id lp8727_ids[] = { 587 { "lp8727" }, 588 { } 589 }; 590 MODULE_DEVICE_TABLE(i2c, lp8727_ids); 591 592 static struct i2c_driver lp8727_driver = { 593 .driver = { 594 .name = "lp8727", 595 .of_match_table = of_match_ptr(lp8727_dt_ids), 596 }, 597 .probe = lp8727_probe, 598 .remove = lp8727_remove, 599 .id_table = lp8727_ids, 600 }; 601 module_i2c_driver(lp8727_driver); 602 603 MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver"); 604 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>"); 605 MODULE_LICENSE("GPL"); 606