1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * DA9150 Charger Driver 4 * 5 * Copyright (c) 2014 Dialog Semiconductor 6 * 7 * Author: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> 8 */ 9 10#include <linux/kernel.h> 11#include <linux/slab.h> 12#include <linux/module.h> 13#include <linux/platform_device.h> 14#include <linux/interrupt.h> 15#include <linux/power_supply.h> 16#include <linux/notifier.h> 17#include <linux/usb/phy.h> 18#include <linux/iio/consumer.h> 19#include <linux/mfd/da9150/core.h> 20#include <linux/mfd/da9150/registers.h> 21 22/* Private data */ 23struct da9150_charger { 24 struct da9150 *da9150; 25 struct device *dev; 26 27 struct power_supply *usb; 28 struct power_supply *battery; 29 struct power_supply *supply_online; 30 31 struct usb_phy *usb_phy; 32 struct notifier_block otg_nb; 33 struct work_struct otg_work; 34 unsigned long usb_event; 35 36 struct iio_channel *ibus_chan; 37 struct iio_channel *vbus_chan; 38 struct iio_channel *tjunc_chan; 39 struct iio_channel *vbat_chan; 40}; 41 42static inline int da9150_charger_supply_online(struct da9150_charger *charger, 43 struct power_supply *psy, 44 union power_supply_propval *val) 45{ 46 val->intval = (psy == charger->supply_online) ? 1 : 0; 47 48 return 0; 49} 50 51/* Charger Properties */ 52static int da9150_charger_vbus_voltage_now(struct da9150_charger *charger, 53 union power_supply_propval *val) 54{ 55 int v_val, ret; 56 57 /* Read processed value - mV units */ 58 ret = iio_read_channel_processed(charger->vbus_chan, &v_val); 59 if (ret < 0) 60 return ret; 61 62 /* Convert voltage to expected uV units */ 63 val->intval = v_val * 1000; 64 65 return 0; 66} 67 68static int da9150_charger_ibus_current_avg(struct da9150_charger *charger, 69 union power_supply_propval *val) 70{ 71 int i_val, ret; 72 73 /* Read processed value - mA units */ 74 ret = iio_read_channel_processed(charger->ibus_chan, &i_val); 75 if (ret < 0) 76 return ret; 77 78 /* Convert current to expected uA units */ 79 val->intval = i_val * 1000; 80 81 return 0; 82} 83 84static int da9150_charger_tjunc_temp(struct da9150_charger *charger, 85 union power_supply_propval *val) 86{ 87 int t_val, ret; 88 89 /* Read processed value - 0.001 degrees C units */ 90 ret = iio_read_channel_processed(charger->tjunc_chan, &t_val); 91 if (ret < 0) 92 return ret; 93 94 /* Convert temp to expect 0.1 degrees C units */ 95 val->intval = t_val / 100; 96 97 return 0; 98} 99 100static enum power_supply_property da9150_charger_props[] = { 101 POWER_SUPPLY_PROP_ONLINE, 102 POWER_SUPPLY_PROP_VOLTAGE_NOW, 103 POWER_SUPPLY_PROP_CURRENT_AVG, 104 POWER_SUPPLY_PROP_TEMP, 105}; 106 107static int da9150_charger_get_prop(struct power_supply *psy, 108 enum power_supply_property psp, 109 union power_supply_propval *val) 110{ 111 struct da9150_charger *charger = dev_get_drvdata(psy->dev.parent); 112 int ret; 113 114 switch (psp) { 115 case POWER_SUPPLY_PROP_ONLINE: 116 ret = da9150_charger_supply_online(charger, psy, val); 117 break; 118 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 119 ret = da9150_charger_vbus_voltage_now(charger, val); 120 break; 121 case POWER_SUPPLY_PROP_CURRENT_AVG: 122 ret = da9150_charger_ibus_current_avg(charger, val); 123 break; 124 case POWER_SUPPLY_PROP_TEMP: 125 ret = da9150_charger_tjunc_temp(charger, val); 126 break; 127 default: 128 ret = -EINVAL; 129 break; 130 } 131 132 return ret; 133} 134 135/* Battery Properties */ 136static int da9150_charger_battery_status(struct da9150_charger *charger, 137 union power_supply_propval *val) 138{ 139 u8 reg; 140 141 /* Check to see if battery is discharging */ 142 reg = da9150_reg_read(charger->da9150, DA9150_STATUS_H); 143 144 if (((reg & DA9150_VBUS_STAT_MASK) == DA9150_VBUS_STAT_OFF) || 145 ((reg & DA9150_VBUS_STAT_MASK) == DA9150_VBUS_STAT_WAIT)) { 146 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 147 148 return 0; 149 } 150 151 reg = da9150_reg_read(charger->da9150, DA9150_STATUS_J); 152 153 /* Now check for other states */ 154 switch (reg & DA9150_CHG_STAT_MASK) { 155 case DA9150_CHG_STAT_ACT: 156 case DA9150_CHG_STAT_PRE: 157 case DA9150_CHG_STAT_CC: 158 case DA9150_CHG_STAT_CV: 159 val->intval = POWER_SUPPLY_STATUS_CHARGING; 160 break; 161 case DA9150_CHG_STAT_OFF: 162 case DA9150_CHG_STAT_SUSP: 163 case DA9150_CHG_STAT_TEMP: 164 case DA9150_CHG_STAT_TIME: 165 case DA9150_CHG_STAT_BAT: 166 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 167 break; 168 case DA9150_CHG_STAT_FULL: 169 val->intval = POWER_SUPPLY_STATUS_FULL; 170 break; 171 default: 172 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 173 break; 174 } 175 176 return 0; 177} 178 179static int da9150_charger_battery_health(struct da9150_charger *charger, 180 union power_supply_propval *val) 181{ 182 u8 reg; 183 184 reg = da9150_reg_read(charger->da9150, DA9150_STATUS_J); 185 186 /* Check if temperature limit reached */ 187 switch (reg & DA9150_CHG_TEMP_MASK) { 188 case DA9150_CHG_TEMP_UNDER: 189 val->intval = POWER_SUPPLY_HEALTH_COLD; 190 return 0; 191 case DA9150_CHG_TEMP_OVER: 192 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; 193 return 0; 194 default: 195 break; 196 } 197 198 /* Check for other health states */ 199 switch (reg & DA9150_CHG_STAT_MASK) { 200 case DA9150_CHG_STAT_ACT: 201 case DA9150_CHG_STAT_PRE: 202 val->intval = POWER_SUPPLY_HEALTH_DEAD; 203 break; 204 case DA9150_CHG_STAT_TIME: 205 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 206 break; 207 default: 208 val->intval = POWER_SUPPLY_HEALTH_GOOD; 209 break; 210 } 211 212 return 0; 213} 214 215static int da9150_charger_battery_present(struct da9150_charger *charger, 216 union power_supply_propval *val) 217{ 218 u8 reg; 219 220 /* Check if battery present or removed */ 221 reg = da9150_reg_read(charger->da9150, DA9150_STATUS_J); 222 if ((reg & DA9150_CHG_STAT_MASK) == DA9150_CHG_STAT_BAT) 223 val->intval = 0; 224 else 225 val->intval = 1; 226 227 return 0; 228} 229 230static int da9150_charger_battery_charge_type(struct da9150_charger *charger, 231 union power_supply_propval *val) 232{ 233 u8 reg; 234 235 reg = da9150_reg_read(charger->da9150, DA9150_STATUS_J); 236 237 switch (reg & DA9150_CHG_STAT_MASK) { 238 case DA9150_CHG_STAT_CC: 239 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST; 240 break; 241 case DA9150_CHG_STAT_ACT: 242 case DA9150_CHG_STAT_PRE: 243 case DA9150_CHG_STAT_CV: 244 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; 245 break; 246 default: 247 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE; 248 break; 249 } 250 251 return 0; 252} 253 254static int da9150_charger_battery_voltage_min(struct da9150_charger *charger, 255 union power_supply_propval *val) 256{ 257 u8 reg; 258 259 reg = da9150_reg_read(charger->da9150, DA9150_PPR_CHGCTRL_C); 260 261 /* Value starts at 2500 mV, 50 mV increments, presented in uV */ 262 val->intval = ((reg & DA9150_CHG_VFAULT_MASK) * 50000) + 2500000; 263 264 return 0; 265} 266 267static int da9150_charger_battery_voltage_now(struct da9150_charger *charger, 268 union power_supply_propval *val) 269{ 270 int v_val, ret; 271 272 /* Read processed value - mV units */ 273 ret = iio_read_channel_processed(charger->vbat_chan, &v_val); 274 if (ret < 0) 275 return ret; 276 277 val->intval = v_val * 1000; 278 279 return 0; 280} 281 282static int da9150_charger_battery_current_max(struct da9150_charger *charger, 283 union power_supply_propval *val) 284{ 285 int reg; 286 287 reg = da9150_reg_read(charger->da9150, DA9150_PPR_CHGCTRL_D); 288 289 /* 25mA increments */ 290 val->intval = reg * 25000; 291 292 return 0; 293} 294 295static int da9150_charger_battery_voltage_max(struct da9150_charger *charger, 296 union power_supply_propval *val) 297{ 298 u8 reg; 299 300 reg = da9150_reg_read(charger->da9150, DA9150_PPR_CHGCTRL_B); 301 302 /* Value starts at 3650 mV, 25 mV increments, presented in uV */ 303 val->intval = ((reg & DA9150_CHG_VBAT_MASK) * 25000) + 3650000; 304 return 0; 305} 306 307static enum power_supply_property da9150_charger_bat_props[] = { 308 POWER_SUPPLY_PROP_STATUS, 309 POWER_SUPPLY_PROP_ONLINE, 310 POWER_SUPPLY_PROP_HEALTH, 311 POWER_SUPPLY_PROP_PRESENT, 312 POWER_SUPPLY_PROP_CHARGE_TYPE, 313 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 314 POWER_SUPPLY_PROP_VOLTAGE_NOW, 315 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, 316 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, 317}; 318 319static int da9150_charger_battery_get_prop(struct power_supply *psy, 320 enum power_supply_property psp, 321 union power_supply_propval *val) 322{ 323 struct da9150_charger *charger = dev_get_drvdata(psy->dev.parent); 324 int ret; 325 326 switch (psp) { 327 case POWER_SUPPLY_PROP_STATUS: 328 ret = da9150_charger_battery_status(charger, val); 329 break; 330 case POWER_SUPPLY_PROP_ONLINE: 331 ret = da9150_charger_supply_online(charger, psy, val); 332 break; 333 case POWER_SUPPLY_PROP_HEALTH: 334 ret = da9150_charger_battery_health(charger, val); 335 break; 336 case POWER_SUPPLY_PROP_PRESENT: 337 ret = da9150_charger_battery_present(charger, val); 338 break; 339 case POWER_SUPPLY_PROP_CHARGE_TYPE: 340 ret = da9150_charger_battery_charge_type(charger, val); 341 break; 342 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 343 ret = da9150_charger_battery_voltage_min(charger, val); 344 break; 345 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 346 ret = da9150_charger_battery_voltage_now(charger, val); 347 break; 348 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: 349 ret = da9150_charger_battery_current_max(charger, val); 350 break; 351 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: 352 ret = da9150_charger_battery_voltage_max(charger, val); 353 break; 354 default: 355 ret = -EINVAL; 356 break; 357 } 358 359 return ret; 360} 361 362static irqreturn_t da9150_charger_chg_irq(int irq, void *data) 363{ 364 struct da9150_charger *charger = data; 365 366 power_supply_changed(charger->battery); 367 368 return IRQ_HANDLED; 369} 370 371static irqreturn_t da9150_charger_tjunc_irq(int irq, void *data) 372{ 373 struct da9150_charger *charger = data; 374 375 /* Nothing we can really do except report this. */ 376 dev_crit(charger->dev, "TJunc over temperature!!!\n"); 377 power_supply_changed(charger->usb); 378 379 return IRQ_HANDLED; 380} 381 382static irqreturn_t da9150_charger_vfault_irq(int irq, void *data) 383{ 384 struct da9150_charger *charger = data; 385 386 /* Nothing we can really do except report this. */ 387 dev_crit(charger->dev, "VSYS under voltage!!!\n"); 388 power_supply_changed(charger->usb); 389 power_supply_changed(charger->battery); 390 391 return IRQ_HANDLED; 392} 393 394static irqreturn_t da9150_charger_vbus_irq(int irq, void *data) 395{ 396 struct da9150_charger *charger = data; 397 u8 reg; 398 399 reg = da9150_reg_read(charger->da9150, DA9150_STATUS_H); 400 401 /* Charger plugged in or battery only */ 402 switch (reg & DA9150_VBUS_STAT_MASK) { 403 case DA9150_VBUS_STAT_OFF: 404 case DA9150_VBUS_STAT_WAIT: 405 charger->supply_online = charger->battery; 406 break; 407 case DA9150_VBUS_STAT_CHG: 408 charger->supply_online = charger->usb; 409 break; 410 default: 411 dev_warn(charger->dev, "Unknown VBUS state - reg = 0x%x\n", 412 reg); 413 charger->supply_online = NULL; 414 break; 415 } 416 417 power_supply_changed(charger->usb); 418 power_supply_changed(charger->battery); 419 420 return IRQ_HANDLED; 421} 422 423static void da9150_charger_otg_work(struct work_struct *data) 424{ 425 struct da9150_charger *charger = 426 container_of(data, struct da9150_charger, otg_work); 427 428 switch (charger->usb_event) { 429 case USB_EVENT_ID: 430 /* Enable OTG Boost */ 431 da9150_set_bits(charger->da9150, DA9150_PPR_BKCTRL_A, 432 DA9150_VBUS_MODE_MASK, DA9150_VBUS_MODE_OTG); 433 break; 434 case USB_EVENT_NONE: 435 /* Revert to charge mode */ 436 power_supply_changed(charger->usb); 437 power_supply_changed(charger->battery); 438 da9150_set_bits(charger->da9150, DA9150_PPR_BKCTRL_A, 439 DA9150_VBUS_MODE_MASK, DA9150_VBUS_MODE_CHG); 440 break; 441 } 442} 443 444static int da9150_charger_otg_ncb(struct notifier_block *nb, unsigned long val, 445 void *priv) 446{ 447 struct da9150_charger *charger = 448 container_of(nb, struct da9150_charger, otg_nb); 449 450 dev_dbg(charger->dev, "DA9150 OTG notify %lu\n", val); 451 452 charger->usb_event = val; 453 schedule_work(&charger->otg_work); 454 455 return NOTIFY_OK; 456} 457 458static int da9150_charger_register_irq(struct platform_device *pdev, 459 irq_handler_t handler, 460 const char *irq_name) 461{ 462 struct device *dev = &pdev->dev; 463 struct da9150_charger *charger = platform_get_drvdata(pdev); 464 int irq, ret; 465 466 irq = platform_get_irq_byname(pdev, irq_name); 467 if (irq < 0) 468 return irq; 469 470 ret = request_threaded_irq(irq, NULL, handler, IRQF_ONESHOT, irq_name, 471 charger); 472 if (ret) 473 dev_err(dev, "Failed to request IRQ %d: %d\n", irq, ret); 474 475 return ret; 476} 477 478static void da9150_charger_unregister_irq(struct platform_device *pdev, 479 const char *irq_name) 480{ 481 struct da9150_charger *charger = platform_get_drvdata(pdev); 482 int irq; 483 484 irq = platform_get_irq_byname(pdev, irq_name); 485 if (irq < 0) 486 return; 487 488 free_irq(irq, charger); 489} 490 491static const struct power_supply_desc usb_desc = { 492 .name = "da9150-usb", 493 .type = POWER_SUPPLY_TYPE_USB, 494 .properties = da9150_charger_props, 495 .num_properties = ARRAY_SIZE(da9150_charger_props), 496 .get_property = da9150_charger_get_prop, 497}; 498 499static const struct power_supply_desc battery_desc = { 500 .name = "da9150-battery", 501 .type = POWER_SUPPLY_TYPE_BATTERY, 502 .properties = da9150_charger_bat_props, 503 .num_properties = ARRAY_SIZE(da9150_charger_bat_props), 504 .get_property = da9150_charger_battery_get_prop, 505}; 506 507static int da9150_charger_probe(struct platform_device *pdev) 508{ 509 struct device *dev = &pdev->dev; 510 struct da9150 *da9150 = dev_get_drvdata(dev->parent); 511 struct da9150_charger *charger; 512 u8 reg; 513 int ret; 514 515 charger = devm_kzalloc(dev, sizeof(struct da9150_charger), GFP_KERNEL); 516 if (!charger) 517 return -ENOMEM; 518 519 platform_set_drvdata(pdev, charger); 520 charger->da9150 = da9150; 521 charger->dev = dev; 522 523 /* Acquire ADC channels */ 524 charger->ibus_chan = devm_iio_channel_get(dev, "CHAN_IBUS"); 525 if (IS_ERR(charger->ibus_chan)) 526 return PTR_ERR(charger->ibus_chan); 527 528 charger->vbus_chan = devm_iio_channel_get(dev, "CHAN_VBUS"); 529 if (IS_ERR(charger->vbus_chan)) 530 return PTR_ERR(charger->vbus_chan); 531 532 charger->tjunc_chan = devm_iio_channel_get(dev, "CHAN_TJUNC"); 533 if (IS_ERR(charger->tjunc_chan)) 534 return PTR_ERR(charger->tjunc_chan); 535 536 charger->vbat_chan = devm_iio_channel_get(dev, "CHAN_VBAT"); 537 if (IS_ERR(charger->vbat_chan)) 538 return PTR_ERR(charger->vbat_chan); 539 540 /* Register power supplies */ 541 charger->usb = devm_power_supply_register(dev, &usb_desc, NULL); 542 if (IS_ERR(charger->usb)) 543 return PTR_ERR(charger->usb); 544 545 charger->battery = devm_power_supply_register(dev, &battery_desc, NULL); 546 if (IS_ERR(charger->battery)) 547 return PTR_ERR(charger->battery); 548 549 /* Get initial online supply */ 550 reg = da9150_reg_read(da9150, DA9150_STATUS_H); 551 552 switch (reg & DA9150_VBUS_STAT_MASK) { 553 case DA9150_VBUS_STAT_OFF: 554 case DA9150_VBUS_STAT_WAIT: 555 charger->supply_online = charger->battery; 556 break; 557 case DA9150_VBUS_STAT_CHG: 558 charger->supply_online = charger->usb; 559 break; 560 default: 561 dev_warn(dev, "Unknown VBUS state - reg = 0x%x\n", reg); 562 charger->supply_online = NULL; 563 break; 564 } 565 566 /* Setup OTG reporting & configuration */ 567 charger->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); 568 if (!IS_ERR_OR_NULL(charger->usb_phy)) { 569 INIT_WORK(&charger->otg_work, da9150_charger_otg_work); 570 charger->otg_nb.notifier_call = da9150_charger_otg_ncb; 571 usb_register_notifier(charger->usb_phy, &charger->otg_nb); 572 } 573 574 /* Register IRQs */ 575 ret = da9150_charger_register_irq(pdev, da9150_charger_chg_irq, 576 "CHG_STATUS"); 577 if (ret < 0) 578 goto chg_irq_fail; 579 580 ret = da9150_charger_register_irq(pdev, da9150_charger_tjunc_irq, 581 "CHG_TJUNC"); 582 if (ret < 0) 583 goto tjunc_irq_fail; 584 585 ret = da9150_charger_register_irq(pdev, da9150_charger_vfault_irq, 586 "CHG_VFAULT"); 587 if (ret < 0) 588 goto vfault_irq_fail; 589 590 ret = da9150_charger_register_irq(pdev, da9150_charger_vbus_irq, 591 "CHG_VBUS"); 592 if (ret < 0) 593 goto vbus_irq_fail; 594 595 return 0; 596 597 598vbus_irq_fail: 599 da9150_charger_unregister_irq(pdev, "CHG_VFAULT"); 600vfault_irq_fail: 601 da9150_charger_unregister_irq(pdev, "CHG_TJUNC"); 602tjunc_irq_fail: 603 da9150_charger_unregister_irq(pdev, "CHG_STATUS"); 604chg_irq_fail: 605 if (!IS_ERR_OR_NULL(charger->usb_phy)) 606 usb_unregister_notifier(charger->usb_phy, &charger->otg_nb); 607 608 return ret; 609} 610 611static void da9150_charger_remove(struct platform_device *pdev) 612{ 613 struct da9150_charger *charger = platform_get_drvdata(pdev); 614 int irq; 615 616 /* Make sure IRQs are released before unregistering power supplies */ 617 irq = platform_get_irq_byname(pdev, "CHG_VBUS"); 618 free_irq(irq, charger); 619 620 irq = platform_get_irq_byname(pdev, "CHG_VFAULT"); 621 free_irq(irq, charger); 622 623 irq = platform_get_irq_byname(pdev, "CHG_TJUNC"); 624 free_irq(irq, charger); 625 626 irq = platform_get_irq_byname(pdev, "CHG_STATUS"); 627 free_irq(irq, charger); 628 629 if (!IS_ERR_OR_NULL(charger->usb_phy)) 630 usb_unregister_notifier(charger->usb_phy, &charger->otg_nb); 631 cancel_work_sync(&charger->otg_work); 632} 633 634static struct platform_driver da9150_charger_driver = { 635 .driver = { 636 .name = "da9150-charger", 637 }, 638 .probe = da9150_charger_probe, 639 .remove_new = da9150_charger_remove, 640}; 641 642module_platform_driver(da9150_charger_driver); 643 644MODULE_DESCRIPTION("Charger Driver for DA9150"); 645MODULE_AUTHOR("Adam Thomson <Adam.Thomson.Opensource@diasemi.com>"); 646MODULE_LICENSE("GPL"); 647