1/* 2 * TWL4030/TPS65950 BCI (Battery Charger Interface) driver 3 * 4 * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com> 5 * 6 * based on twl4030_bci_battery.c by TI 7 * Copyright (C) 2008 Texas Instruments, Inc. 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; either version 2 of the License, or 12 * (at your option) any later version. 13 */ 14 15#include <linux/init.h> 16#include <linux/module.h> 17#include <linux/slab.h> 18#include <linux/err.h> 19#include <linux/platform_device.h> 20#include <linux/interrupt.h> 21#include <linux/i2c/twl.h> 22#include <linux/power_supply.h> 23#include <linux/notifier.h> 24#include <linux/usb/otg.h> 25#include <linux/regulator/machine.h> 26 27#define TWL4030_BCIMSTATEC 0x02 28#define TWL4030_BCIICHG 0x08 29#define TWL4030_BCIVAC 0x0a 30#define TWL4030_BCIVBUS 0x0c 31#define TWL4030_BCIMFSTS3 0x0F 32#define TWL4030_BCIMFSTS4 0x10 33#define TWL4030_BCICTL1 0x23 34#define TWL4030_BB_CFG 0x12 35 36#define TWL4030_BCIMFSTS1 0x01 37 38#define TWL4030_BCIAUTOWEN BIT(5) 39#define TWL4030_CONFIG_DONE BIT(4) 40#define TWL4030_BCIAUTOUSB BIT(1) 41#define TWL4030_BCIAUTOAC BIT(0) 42#define TWL4030_CGAIN BIT(5) 43#define TWL4030_USBFASTMCHG BIT(2) 44#define TWL4030_STS_VBUS BIT(7) 45#define TWL4030_STS_USB_ID BIT(2) 46#define TWL4030_BBCHEN BIT(4) 47#define TWL4030_BBSEL_MASK 0x0c 48#define TWL4030_BBSEL_2V5 0x00 49#define TWL4030_BBSEL_3V0 0x04 50#define TWL4030_BBSEL_3V1 0x08 51#define TWL4030_BBSEL_3V2 0x0c 52#define TWL4030_BBISEL_MASK 0x03 53#define TWL4030_BBISEL_25uA 0x00 54#define TWL4030_BBISEL_150uA 0x01 55#define TWL4030_BBISEL_500uA 0x02 56#define TWL4030_BBISEL_1000uA 0x03 57 58#define TWL4030_BATSTSPCHG BIT(2) 59#define TWL4030_BATSTSMCHG BIT(6) 60 61/* BCI interrupts */ 62#define TWL4030_WOVF BIT(0) /* Watchdog overflow */ 63#define TWL4030_TMOVF BIT(1) /* Timer overflow */ 64#define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */ 65#define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */ 66#define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */ 67#define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */ 68#define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */ 69#define TWL4030_BATSTS BIT(7) /* Battery status */ 70 71#define TWL4030_VBATLVL BIT(0) /* VBAT level */ 72#define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */ 73#define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */ 74#define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */ 75 76#define TWL4030_MSTATEC_USB BIT(4) 77#define TWL4030_MSTATEC_AC BIT(5) 78#define TWL4030_MSTATEC_MASK 0x0f 79#define TWL4030_MSTATEC_QUICK1 0x02 80#define TWL4030_MSTATEC_QUICK7 0x07 81#define TWL4030_MSTATEC_COMPLETE1 0x0b 82#define TWL4030_MSTATEC_COMPLETE4 0x0e 83 84static bool allow_usb; 85module_param(allow_usb, bool, 0644); 86MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current"); 87 88struct twl4030_bci { 89 struct device *dev; 90 struct power_supply *ac; 91 struct power_supply *usb; 92 struct usb_phy *transceiver; 93 struct notifier_block usb_nb; 94 struct work_struct work; 95 int irq_chg; 96 int irq_bci; 97 struct regulator *usb_reg; 98 int usb_enabled; 99 100 unsigned long event; 101}; 102 103/* 104 * clear and set bits on an given register on a given module 105 */ 106static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg) 107{ 108 u8 val = 0; 109 int ret; 110 111 ret = twl_i2c_read_u8(mod_no, &val, reg); 112 if (ret) 113 return ret; 114 115 val &= ~clear; 116 val |= set; 117 118 return twl_i2c_write_u8(mod_no, val, reg); 119} 120 121static int twl4030_bci_read(u8 reg, u8 *val) 122{ 123 return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg); 124} 125 126static int twl4030_clear_set_boot_bci(u8 clear, u8 set) 127{ 128 return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear, 129 TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set, 130 TWL4030_PM_MASTER_BOOT_BCI); 131} 132 133static int twl4030bci_read_adc_val(u8 reg) 134{ 135 int ret, temp; 136 u8 val; 137 138 /* read MSB */ 139 ret = twl4030_bci_read(reg + 1, &val); 140 if (ret) 141 return ret; 142 143 temp = (int)(val & 0x03) << 8; 144 145 /* read LSB */ 146 ret = twl4030_bci_read(reg, &val); 147 if (ret) 148 return ret; 149 150 return temp | val; 151} 152 153/* 154 * Check if Battery Pack was present 155 */ 156static int twl4030_is_battery_present(struct twl4030_bci *bci) 157{ 158 int ret; 159 u8 val = 0; 160 161 /* Battery presence in Main charge? */ 162 ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3); 163 if (ret) 164 return ret; 165 if (val & TWL4030_BATSTSMCHG) 166 return 0; 167 168 /* 169 * OK, It could be that bootloader did not enable main charger, 170 * pre-charge is h/w auto. So, Battery presence in Pre-charge? 171 */ 172 ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val, 173 TWL4030_BCIMFSTS1); 174 if (ret) 175 return ret; 176 if (val & TWL4030_BATSTSPCHG) 177 return 0; 178 179 return -ENODEV; 180} 181 182/* 183 * Check if VBUS power is present 184 */ 185static int twl4030_bci_have_vbus(struct twl4030_bci *bci) 186{ 187 int ret; 188 u8 hwsts; 189 190 ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &hwsts, 191 TWL4030_PM_MASTER_STS_HW_CONDITIONS); 192 if (ret < 0) 193 return 0; 194 195 dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts); 196 197 /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */ 198 if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID)) 199 return 1; 200 201 return 0; 202} 203 204/* 205 * Enable/Disable USB Charge functionality. 206 */ 207static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable) 208{ 209 int ret; 210 211 if (enable) { 212 /* Check for USB charger connected */ 213 if (!twl4030_bci_have_vbus(bci)) 214 return -ENODEV; 215 216 /* 217 * Until we can find out what current the device can provide, 218 * require a module param to enable USB charging. 219 */ 220 if (!allow_usb) { 221 dev_warn(bci->dev, "USB charging is disabled.\n"); 222 return -EACCES; 223 } 224 225 /* Need to keep regulator on */ 226 if (!bci->usb_enabled) { 227 ret = regulator_enable(bci->usb_reg); 228 if (ret) { 229 dev_err(bci->dev, 230 "Failed to enable regulator\n"); 231 return ret; 232 } 233 bci->usb_enabled = 1; 234 } 235 236 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */ 237 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB); 238 if (ret < 0) 239 return ret; 240 241 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */ 242 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0, 243 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4); 244 } else { 245 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0); 246 if (bci->usb_enabled) { 247 regulator_disable(bci->usb_reg); 248 bci->usb_enabled = 0; 249 } 250 } 251 252 return ret; 253} 254 255/* 256 * Enable/Disable AC Charge funtionality. 257 */ 258static int twl4030_charger_enable_ac(bool enable) 259{ 260 int ret; 261 262 if (enable) 263 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC); 264 else 265 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0); 266 267 return ret; 268} 269 270/* 271 * Enable/Disable charging of Backup Battery. 272 */ 273static int twl4030_charger_enable_backup(int uvolt, int uamp) 274{ 275 int ret; 276 u8 flags; 277 278 if (uvolt < 2500000 || 279 uamp < 25) { 280 /* disable charging of backup battery */ 281 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, 282 TWL4030_BBCHEN, 0, TWL4030_BB_CFG); 283 return ret; 284 } 285 286 flags = TWL4030_BBCHEN; 287 if (uvolt >= 3200000) 288 flags |= TWL4030_BBSEL_3V2; 289 else if (uvolt >= 3100000) 290 flags |= TWL4030_BBSEL_3V1; 291 else if (uvolt >= 3000000) 292 flags |= TWL4030_BBSEL_3V0; 293 else 294 flags |= TWL4030_BBSEL_2V5; 295 296 if (uamp >= 1000) 297 flags |= TWL4030_BBISEL_1000uA; 298 else if (uamp >= 500) 299 flags |= TWL4030_BBISEL_500uA; 300 else if (uamp >= 150) 301 flags |= TWL4030_BBISEL_150uA; 302 else 303 flags |= TWL4030_BBISEL_25uA; 304 305 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, 306 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK, 307 flags, 308 TWL4030_BB_CFG); 309 310 return ret; 311} 312 313/* 314 * TWL4030 CHG_PRES (AC charger presence) events 315 */ 316static irqreturn_t twl4030_charger_interrupt(int irq, void *arg) 317{ 318 struct twl4030_bci *bci = arg; 319 320 dev_dbg(bci->dev, "CHG_PRES irq\n"); 321 power_supply_changed(bci->ac); 322 power_supply_changed(bci->usb); 323 324 return IRQ_HANDLED; 325} 326 327/* 328 * TWL4030 BCI monitoring events 329 */ 330static irqreturn_t twl4030_bci_interrupt(int irq, void *arg) 331{ 332 struct twl4030_bci *bci = arg; 333 u8 irqs1, irqs2; 334 int ret; 335 336 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1, 337 TWL4030_INTERRUPTS_BCIISR1A); 338 if (ret < 0) 339 return IRQ_HANDLED; 340 341 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2, 342 TWL4030_INTERRUPTS_BCIISR2A); 343 if (ret < 0) 344 return IRQ_HANDLED; 345 346 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1); 347 348 if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) { 349 /* charger state change, inform the core */ 350 power_supply_changed(bci->ac); 351 power_supply_changed(bci->usb); 352 } 353 354 /* various monitoring events, for now we just log them here */ 355 if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1)) 356 dev_warn(bci->dev, "battery temperature out of range\n"); 357 358 if (irqs1 & TWL4030_BATSTS) 359 dev_crit(bci->dev, "battery disconnected\n"); 360 361 if (irqs2 & TWL4030_VBATOV) 362 dev_crit(bci->dev, "VBAT overvoltage\n"); 363 364 if (irqs2 & TWL4030_VBUSOV) 365 dev_crit(bci->dev, "VBUS overvoltage\n"); 366 367 if (irqs2 & TWL4030_ACCHGOV) 368 dev_crit(bci->dev, "Ac charger overvoltage\n"); 369 370 return IRQ_HANDLED; 371} 372 373static void twl4030_bci_usb_work(struct work_struct *data) 374{ 375 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work); 376 377 switch (bci->event) { 378 case USB_EVENT_VBUS: 379 case USB_EVENT_CHARGER: 380 twl4030_charger_enable_usb(bci, true); 381 break; 382 case USB_EVENT_NONE: 383 twl4030_charger_enable_usb(bci, false); 384 break; 385 } 386} 387 388static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val, 389 void *priv) 390{ 391 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb); 392 393 dev_dbg(bci->dev, "OTG notify %lu\n", val); 394 395 bci->event = val; 396 schedule_work(&bci->work); 397 398 return NOTIFY_OK; 399} 400 401/* 402 * TI provided formulas: 403 * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85 404 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7 405 * Here we use integer approximation of: 406 * CGAIN == 0: val * 1.6618 - 0.85 407 * CGAIN == 1: (val * 1.6618 - 0.85) * 2 408 */ 409static int twl4030_charger_get_current(void) 410{ 411 int curr; 412 int ret; 413 u8 bcictl1; 414 415 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG); 416 if (curr < 0) 417 return curr; 418 419 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); 420 if (ret) 421 return ret; 422 423 ret = (curr * 16618 - 850 * 10000) / 10; 424 if (bcictl1 & TWL4030_CGAIN) 425 ret *= 2; 426 427 return ret; 428} 429 430/* 431 * Returns the main charge FSM state 432 * Or < 0 on failure. 433 */ 434static int twl4030bci_state(struct twl4030_bci *bci) 435{ 436 int ret; 437 u8 state; 438 439 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state); 440 if (ret) { 441 pr_err("twl4030_bci: error reading BCIMSTATEC\n"); 442 return ret; 443 } 444 445 dev_dbg(bci->dev, "state: %02x\n", state); 446 447 return state; 448} 449 450static int twl4030_bci_state_to_status(int state) 451{ 452 state &= TWL4030_MSTATEC_MASK; 453 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7) 454 return POWER_SUPPLY_STATUS_CHARGING; 455 else if (TWL4030_MSTATEC_COMPLETE1 <= state && 456 state <= TWL4030_MSTATEC_COMPLETE4) 457 return POWER_SUPPLY_STATUS_FULL; 458 else 459 return POWER_SUPPLY_STATUS_NOT_CHARGING; 460} 461 462static int twl4030_bci_get_property(struct power_supply *psy, 463 enum power_supply_property psp, 464 union power_supply_propval *val) 465{ 466 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent); 467 int is_charging; 468 int state; 469 int ret; 470 471 state = twl4030bci_state(bci); 472 if (state < 0) 473 return state; 474 475 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) 476 is_charging = state & TWL4030_MSTATEC_USB; 477 else 478 is_charging = state & TWL4030_MSTATEC_AC; 479 480 switch (psp) { 481 case POWER_SUPPLY_PROP_STATUS: 482 if (is_charging) 483 val->intval = twl4030_bci_state_to_status(state); 484 else 485 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 486 break; 487 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 488 /* charging must be active for meaningful result */ 489 if (!is_charging) 490 return -ENODATA; 491 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) { 492 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS); 493 if (ret < 0) 494 return ret; 495 /* BCIVBUS uses ADCIN8, 7/1023 V/step */ 496 val->intval = ret * 6843; 497 } else { 498 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC); 499 if (ret < 0) 500 return ret; 501 /* BCIVAC uses ADCIN11, 10/1023 V/step */ 502 val->intval = ret * 9775; 503 } 504 break; 505 case POWER_SUPPLY_PROP_CURRENT_NOW: 506 if (!is_charging) 507 return -ENODATA; 508 /* current measurement is shared between AC and USB */ 509 ret = twl4030_charger_get_current(); 510 if (ret < 0) 511 return ret; 512 val->intval = ret; 513 break; 514 case POWER_SUPPLY_PROP_ONLINE: 515 val->intval = is_charging && 516 twl4030_bci_state_to_status(state) != 517 POWER_SUPPLY_STATUS_NOT_CHARGING; 518 break; 519 default: 520 return -EINVAL; 521 } 522 523 return 0; 524} 525 526static enum power_supply_property twl4030_charger_props[] = { 527 POWER_SUPPLY_PROP_STATUS, 528 POWER_SUPPLY_PROP_ONLINE, 529 POWER_SUPPLY_PROP_VOLTAGE_NOW, 530 POWER_SUPPLY_PROP_CURRENT_NOW, 531}; 532 533#ifdef CONFIG_OF 534static const struct twl4030_bci_platform_data * 535twl4030_bci_parse_dt(struct device *dev) 536{ 537 struct device_node *np = dev->of_node; 538 struct twl4030_bci_platform_data *pdata; 539 u32 num; 540 541 if (!np) 542 return NULL; 543 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 544 if (!pdata) 545 return pdata; 546 547 if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0) 548 pdata->bb_uvolt = num; 549 if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0) 550 pdata->bb_uamp = num; 551 return pdata; 552} 553#else 554static inline const struct twl4030_bci_platform_data * 555twl4030_bci_parse_dt(struct device *dev) 556{ 557 return NULL; 558} 559#endif 560 561static const struct power_supply_desc twl4030_bci_ac_desc = { 562 .name = "twl4030_ac", 563 .type = POWER_SUPPLY_TYPE_MAINS, 564 .properties = twl4030_charger_props, 565 .num_properties = ARRAY_SIZE(twl4030_charger_props), 566 .get_property = twl4030_bci_get_property, 567}; 568 569static const struct power_supply_desc twl4030_bci_usb_desc = { 570 .name = "twl4030_usb", 571 .type = POWER_SUPPLY_TYPE_USB, 572 .properties = twl4030_charger_props, 573 .num_properties = ARRAY_SIZE(twl4030_charger_props), 574 .get_property = twl4030_bci_get_property, 575}; 576 577static int __init twl4030_bci_probe(struct platform_device *pdev) 578{ 579 struct twl4030_bci *bci; 580 const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data; 581 int ret; 582 u32 reg; 583 584 bci = kzalloc(sizeof(*bci), GFP_KERNEL); 585 if (bci == NULL) 586 return -ENOMEM; 587 588 if (!pdata) 589 pdata = twl4030_bci_parse_dt(&pdev->dev); 590 591 bci->dev = &pdev->dev; 592 bci->irq_chg = platform_get_irq(pdev, 0); 593 bci->irq_bci = platform_get_irq(pdev, 1); 594 595 /* Only proceed further *IF* battery is physically present */ 596 ret = twl4030_is_battery_present(bci); 597 if (ret) { 598 dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret); 599 goto fail_no_battery; 600 } 601 602 platform_set_drvdata(pdev, bci); 603 604 bci->ac = power_supply_register(&pdev->dev, &twl4030_bci_ac_desc, 605 NULL); 606 if (IS_ERR(bci->ac)) { 607 ret = PTR_ERR(bci->ac); 608 dev_err(&pdev->dev, "failed to register ac: %d\n", ret); 609 goto fail_register_ac; 610 } 611 612 bci->usb_reg = regulator_get(bci->dev, "bci3v1"); 613 614 bci->usb = power_supply_register(&pdev->dev, &twl4030_bci_usb_desc, 615 NULL); 616 if (IS_ERR(bci->usb)) { 617 ret = PTR_ERR(bci->usb); 618 dev_err(&pdev->dev, "failed to register usb: %d\n", ret); 619 goto fail_register_usb; 620 } 621 622 ret = request_threaded_irq(bci->irq_chg, NULL, 623 twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name, 624 bci); 625 if (ret < 0) { 626 dev_err(&pdev->dev, "could not request irq %d, status %d\n", 627 bci->irq_chg, ret); 628 goto fail_chg_irq; 629 } 630 631 ret = request_threaded_irq(bci->irq_bci, NULL, 632 twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci); 633 if (ret < 0) { 634 dev_err(&pdev->dev, "could not request irq %d, status %d\n", 635 bci->irq_bci, ret); 636 goto fail_bci_irq; 637 } 638 639 INIT_WORK(&bci->work, twl4030_bci_usb_work); 640 641 bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2); 642 if (!IS_ERR_OR_NULL(bci->transceiver)) { 643 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb; 644 usb_register_notifier(bci->transceiver, &bci->usb_nb); 645 } 646 647 /* Enable interrupts now. */ 648 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 | 649 TWL4030_TBATOR1 | TWL4030_BATSTS); 650 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, 651 TWL4030_INTERRUPTS_BCIIMR1A); 652 if (ret < 0) { 653 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret); 654 goto fail_unmask_interrupts; 655 } 656 657 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV); 658 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, 659 TWL4030_INTERRUPTS_BCIIMR2A); 660 if (ret < 0) 661 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret); 662 663 twl4030_charger_enable_ac(true); 664 twl4030_charger_enable_usb(bci, true); 665 if (pdata) 666 twl4030_charger_enable_backup(pdata->bb_uvolt, 667 pdata->bb_uamp); 668 else 669 twl4030_charger_enable_backup(0, 0); 670 671 return 0; 672 673fail_unmask_interrupts: 674 if (!IS_ERR_OR_NULL(bci->transceiver)) { 675 usb_unregister_notifier(bci->transceiver, &bci->usb_nb); 676 usb_put_phy(bci->transceiver); 677 } 678 free_irq(bci->irq_bci, bci); 679fail_bci_irq: 680 free_irq(bci->irq_chg, bci); 681fail_chg_irq: 682 power_supply_unregister(bci->usb); 683fail_register_usb: 684 power_supply_unregister(bci->ac); 685fail_register_ac: 686fail_no_battery: 687 kfree(bci); 688 689 return ret; 690} 691 692static int __exit twl4030_bci_remove(struct platform_device *pdev) 693{ 694 struct twl4030_bci *bci = platform_get_drvdata(pdev); 695 696 twl4030_charger_enable_ac(false); 697 twl4030_charger_enable_usb(bci, false); 698 twl4030_charger_enable_backup(0, 0); 699 700 /* mask interrupts */ 701 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, 702 TWL4030_INTERRUPTS_BCIIMR1A); 703 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, 704 TWL4030_INTERRUPTS_BCIIMR2A); 705 706 if (!IS_ERR_OR_NULL(bci->transceiver)) { 707 usb_unregister_notifier(bci->transceiver, &bci->usb_nb); 708 usb_put_phy(bci->transceiver); 709 } 710 free_irq(bci->irq_bci, bci); 711 free_irq(bci->irq_chg, bci); 712 power_supply_unregister(bci->usb); 713 power_supply_unregister(bci->ac); 714 kfree(bci); 715 716 return 0; 717} 718 719static const struct of_device_id twl_bci_of_match[] = { 720 {.compatible = "ti,twl4030-bci", }, 721 { } 722}; 723MODULE_DEVICE_TABLE(of, twl_bci_of_match); 724 725static struct platform_driver twl4030_bci_driver = { 726 .driver = { 727 .name = "twl4030_bci", 728 .of_match_table = of_match_ptr(twl_bci_of_match), 729 }, 730 .remove = __exit_p(twl4030_bci_remove), 731}; 732 733module_platform_driver_probe(twl4030_bci_driver, twl4030_bci_probe); 734 735MODULE_AUTHOR("Gražvydas Ignotas"); 736MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver"); 737MODULE_LICENSE("GPL"); 738MODULE_ALIAS("platform:twl4030_bci"); 739