1/* 2 * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC 3 * 4 * Copyright (C) 2012 Samsung Electronics 5 * Donggeun Kim <dg77.kim@samsung.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18#include <linux/kernel.h> 19#include <linux/module.h> 20#include <linux/i2c.h> 21#include <linux/slab.h> 22#include <linux/interrupt.h> 23#include <linux/err.h> 24#include <linux/platform_device.h> 25#include <linux/kobject.h> 26#include <linux/mfd/max8997.h> 27#include <linux/mfd/max8997-private.h> 28#include <linux/extcon.h> 29#include <linux/irqdomain.h> 30 31#define DEV_NAME "max8997-muic" 32#define DELAY_MS_DEFAULT 20000 /* unit: millisecond */ 33 34enum max8997_muic_adc_debounce_time { 35 ADC_DEBOUNCE_TIME_0_5MS = 0, /* 0.5ms */ 36 ADC_DEBOUNCE_TIME_10MS, /* 10ms */ 37 ADC_DEBOUNCE_TIME_25MS, /* 25ms */ 38 ADC_DEBOUNCE_TIME_38_62MS, /* 38.62ms */ 39}; 40 41struct max8997_muic_irq { 42 unsigned int irq; 43 const char *name; 44 unsigned int virq; 45}; 46 47static struct max8997_muic_irq muic_irqs[] = { 48 { MAX8997_MUICIRQ_ADCError, "muic-ADCERROR" }, 49 { MAX8997_MUICIRQ_ADCLow, "muic-ADCLOW" }, 50 { MAX8997_MUICIRQ_ADC, "muic-ADC" }, 51 { MAX8997_MUICIRQ_VBVolt, "muic-VBVOLT" }, 52 { MAX8997_MUICIRQ_DBChg, "muic-DBCHG" }, 53 { MAX8997_MUICIRQ_DCDTmr, "muic-DCDTMR" }, 54 { MAX8997_MUICIRQ_ChgDetRun, "muic-CHGDETRUN" }, 55 { MAX8997_MUICIRQ_ChgTyp, "muic-CHGTYP" }, 56 { MAX8997_MUICIRQ_OVP, "muic-OVP" }, 57}; 58 59/* Define supported cable type */ 60enum max8997_muic_acc_type { 61 MAX8997_MUIC_ADC_GROUND = 0x0, 62 MAX8997_MUIC_ADC_MHL, /* MHL*/ 63 MAX8997_MUIC_ADC_REMOTE_S1_BUTTON, 64 MAX8997_MUIC_ADC_REMOTE_S2_BUTTON, 65 MAX8997_MUIC_ADC_REMOTE_S3_BUTTON, 66 MAX8997_MUIC_ADC_REMOTE_S4_BUTTON, 67 MAX8997_MUIC_ADC_REMOTE_S5_BUTTON, 68 MAX8997_MUIC_ADC_REMOTE_S6_BUTTON, 69 MAX8997_MUIC_ADC_REMOTE_S7_BUTTON, 70 MAX8997_MUIC_ADC_REMOTE_S8_BUTTON, 71 MAX8997_MUIC_ADC_REMOTE_S9_BUTTON, 72 MAX8997_MUIC_ADC_REMOTE_S10_BUTTON, 73 MAX8997_MUIC_ADC_REMOTE_S11_BUTTON, 74 MAX8997_MUIC_ADC_REMOTE_S12_BUTTON, 75 MAX8997_MUIC_ADC_RESERVED_ACC_1, 76 MAX8997_MUIC_ADC_RESERVED_ACC_2, 77 MAX8997_MUIC_ADC_RESERVED_ACC_3, 78 MAX8997_MUIC_ADC_RESERVED_ACC_4, 79 MAX8997_MUIC_ADC_RESERVED_ACC_5, 80 MAX8997_MUIC_ADC_CEA936_AUDIO, 81 MAX8997_MUIC_ADC_PHONE_POWERED_DEV, 82 MAX8997_MUIC_ADC_TTY_CONVERTER, 83 MAX8997_MUIC_ADC_UART_CABLE, 84 MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG, 85 MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF, /* JIG-USB-OFF */ 86 MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON, /* JIG-USB-ON */ 87 MAX8997_MUIC_ADC_AV_CABLE_NOLOAD, /* DESKDOCK */ 88 MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG, 89 MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF, /* JIG-UART */ 90 MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON, /* CARDOCK */ 91 MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE, 92 MAX8997_MUIC_ADC_OPEN, /* OPEN */ 93}; 94 95enum max8997_muic_cable_group { 96 MAX8997_CABLE_GROUP_ADC = 0, 97 MAX8997_CABLE_GROUP_ADC_GND, 98 MAX8997_CABLE_GROUP_CHG, 99 MAX8997_CABLE_GROUP_VBVOLT, 100}; 101 102enum max8997_muic_usb_type { 103 MAX8997_USB_HOST, 104 MAX8997_USB_DEVICE, 105}; 106 107enum max8997_muic_charger_type { 108 MAX8997_CHARGER_TYPE_NONE = 0, 109 MAX8997_CHARGER_TYPE_USB, 110 MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT, 111 MAX8997_CHARGER_TYPE_DEDICATED_CHG, 112 MAX8997_CHARGER_TYPE_500MA, 113 MAX8997_CHARGER_TYPE_1A, 114 MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7, 115}; 116 117struct max8997_muic_info { 118 struct device *dev; 119 struct i2c_client *muic; 120 struct extcon_dev *edev; 121 int prev_cable_type; 122 int prev_chg_type; 123 u8 status[2]; 124 125 int irq; 126 struct work_struct irq_work; 127 struct mutex mutex; 128 129 struct max8997_muic_platform_data *muic_pdata; 130 enum max8997_muic_charger_type pre_charger_type; 131 132 /* 133 * Use delayed workqueue to detect cable state and then 134 * notify cable state to notifiee/platform through uevent. 135 * After completing the booting of platform, the extcon provider 136 * driver should notify cable state to upper layer. 137 */ 138 struct delayed_work wq_detcable; 139 140 /* 141 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB 142 * h/w path of COMP2/COMN1 on CONTROL1 register. 143 */ 144 int path_usb; 145 int path_uart; 146}; 147 148enum { 149 EXTCON_CABLE_USB = 0, 150 EXTCON_CABLE_USB_HOST, 151 EXTCON_CABLE_TA, 152 EXTCON_CABLE_FAST_CHARGER, 153 EXTCON_CABLE_SLOW_CHARGER, 154 EXTCON_CABLE_CHARGE_DOWNSTREAM, 155 EXTCON_CABLE_MHL, 156 EXTCON_CABLE_DOCK_DESK, 157 EXTCON_CABLE_DOCK_CARD, 158 EXTCON_CABLE_JIG, 159 160 _EXTCON_CABLE_NUM, 161}; 162 163static const char *max8997_extcon_cable[] = { 164 [EXTCON_CABLE_USB] = "USB", 165 [EXTCON_CABLE_USB_HOST] = "USB-Host", 166 [EXTCON_CABLE_TA] = "TA", 167 [EXTCON_CABLE_FAST_CHARGER] = "Fast-charger", 168 [EXTCON_CABLE_SLOW_CHARGER] = "Slow-charger", 169 [EXTCON_CABLE_CHARGE_DOWNSTREAM] = "Charge-downstream", 170 [EXTCON_CABLE_MHL] = "MHL", 171 [EXTCON_CABLE_DOCK_DESK] = "Dock-Desk", 172 [EXTCON_CABLE_DOCK_CARD] = "Dock-Card", 173 [EXTCON_CABLE_JIG] = "JIG", 174 175 NULL, 176}; 177 178/* 179 * max8997_muic_set_debounce_time - Set the debounce time of ADC 180 * @info: the instance including private data of max8997 MUIC 181 * @time: the debounce time of ADC 182 */ 183static int max8997_muic_set_debounce_time(struct max8997_muic_info *info, 184 enum max8997_muic_adc_debounce_time time) 185{ 186 int ret; 187 188 switch (time) { 189 case ADC_DEBOUNCE_TIME_0_5MS: 190 case ADC_DEBOUNCE_TIME_10MS: 191 case ADC_DEBOUNCE_TIME_25MS: 192 case ADC_DEBOUNCE_TIME_38_62MS: 193 ret = max8997_update_reg(info->muic, 194 MAX8997_MUIC_REG_CONTROL3, 195 time << CONTROL3_ADCDBSET_SHIFT, 196 CONTROL3_ADCDBSET_MASK); 197 if (ret) { 198 dev_err(info->dev, "failed to set ADC debounce time\n"); 199 return ret; 200 } 201 break; 202 default: 203 dev_err(info->dev, "invalid ADC debounce time\n"); 204 return -EINVAL; 205 } 206 207 return 0; 208}; 209 210/* 211 * max8997_muic_set_path - Set hardware line according to attached cable 212 * @info: the instance including private data of max8997 MUIC 213 * @value: the path according to attached cable 214 * @attached: the state of cable (true:attached, false:detached) 215 * 216 * The max8997 MUIC device share outside H/W line among a varity of cables, 217 * so this function set internal path of H/W line according to the type of 218 * attached cable. 219 */ 220static int max8997_muic_set_path(struct max8997_muic_info *info, 221 u8 val, bool attached) 222{ 223 int ret = 0; 224 u8 ctrl1, ctrl2 = 0; 225 226 if (attached) 227 ctrl1 = val; 228 else 229 ctrl1 = CONTROL1_SW_OPEN; 230 231 ret = max8997_update_reg(info->muic, 232 MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK); 233 if (ret < 0) { 234 dev_err(info->dev, "failed to update MUIC register\n"); 235 return ret; 236 } 237 238 if (attached) 239 ctrl2 |= CONTROL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */ 240 else 241 ctrl2 |= CONTROL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */ 242 243 ret = max8997_update_reg(info->muic, 244 MAX8997_MUIC_REG_CONTROL2, ctrl2, 245 CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK); 246 if (ret < 0) { 247 dev_err(info->dev, "failed to update MUIC register\n"); 248 return ret; 249 } 250 251 dev_info(info->dev, 252 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n", 253 ctrl1, ctrl2, attached ? "attached" : "detached"); 254 255 return 0; 256} 257 258/* 259 * max8997_muic_get_cable_type - Return cable type and check cable state 260 * @info: the instance including private data of max8997 MUIC 261 * @group: the path according to attached cable 262 * @attached: store cable state and return 263 * 264 * This function check the cable state either attached or detached, 265 * and then divide precise type of cable according to cable group. 266 * - MAX8997_CABLE_GROUP_ADC 267 * - MAX8997_CABLE_GROUP_CHG 268 */ 269static int max8997_muic_get_cable_type(struct max8997_muic_info *info, 270 enum max8997_muic_cable_group group, bool *attached) 271{ 272 int cable_type = 0; 273 int adc; 274 int chg_type; 275 276 switch (group) { 277 case MAX8997_CABLE_GROUP_ADC: 278 /* 279 * Read ADC value to check cable type and decide cable state 280 * according to cable type 281 */ 282 adc = info->status[0] & STATUS1_ADC_MASK; 283 adc >>= STATUS1_ADC_SHIFT; 284 285 /* 286 * Check current cable state/cable type and store cable type 287 * (info->prev_cable_type) for handling cable when cable is 288 * detached. 289 */ 290 if (adc == MAX8997_MUIC_ADC_OPEN) { 291 *attached = false; 292 293 cable_type = info->prev_cable_type; 294 info->prev_cable_type = MAX8997_MUIC_ADC_OPEN; 295 } else { 296 *attached = true; 297 298 cable_type = info->prev_cable_type = adc; 299 } 300 break; 301 case MAX8997_CABLE_GROUP_CHG: 302 /* 303 * Read charger type to check cable type and decide cable state 304 * according to type of charger cable. 305 */ 306 chg_type = info->status[1] & STATUS2_CHGTYP_MASK; 307 chg_type >>= STATUS2_CHGTYP_SHIFT; 308 309 if (chg_type == MAX8997_CHARGER_TYPE_NONE) { 310 *attached = false; 311 312 cable_type = info->prev_chg_type; 313 info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE; 314 } else { 315 *attached = true; 316 317 /* 318 * Check current cable state/cable type and store cable 319 * type(info->prev_chg_type) for handling cable when 320 * charger cable is detached. 321 */ 322 cable_type = info->prev_chg_type = chg_type; 323 } 324 325 break; 326 default: 327 dev_err(info->dev, "Unknown cable group (%d)\n", group); 328 cable_type = -EINVAL; 329 break; 330 } 331 332 return cable_type; 333} 334 335static int max8997_muic_handle_usb(struct max8997_muic_info *info, 336 enum max8997_muic_usb_type usb_type, bool attached) 337{ 338 int ret = 0; 339 340 if (usb_type == MAX8997_USB_HOST) { 341 ret = max8997_muic_set_path(info, info->path_usb, attached); 342 if (ret < 0) { 343 dev_err(info->dev, "failed to update muic register\n"); 344 return ret; 345 } 346 } 347 348 switch (usb_type) { 349 case MAX8997_USB_HOST: 350 extcon_set_cable_state(info->edev, "USB-Host", attached); 351 break; 352 case MAX8997_USB_DEVICE: 353 extcon_set_cable_state(info->edev, "USB", attached); 354 break; 355 default: 356 dev_err(info->dev, "failed to detect %s usb cable\n", 357 attached ? "attached" : "detached"); 358 return -EINVAL; 359 } 360 361 return 0; 362} 363 364static int max8997_muic_handle_dock(struct max8997_muic_info *info, 365 int cable_type, bool attached) 366{ 367 int ret = 0; 368 369 ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached); 370 if (ret) { 371 dev_err(info->dev, "failed to update muic register\n"); 372 return ret; 373 } 374 375 switch (cable_type) { 376 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD: 377 extcon_set_cable_state(info->edev, "Dock-desk", attached); 378 break; 379 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON: 380 extcon_set_cable_state(info->edev, "Dock-card", attached); 381 break; 382 default: 383 dev_err(info->dev, "failed to detect %s dock device\n", 384 attached ? "attached" : "detached"); 385 return -EINVAL; 386 } 387 388 return 0; 389} 390 391static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info, 392 bool attached) 393{ 394 int ret = 0; 395 396 /* switch to UART */ 397 ret = max8997_muic_set_path(info, info->path_uart, attached); 398 if (ret) { 399 dev_err(info->dev, "failed to update muic register\n"); 400 return ret; 401 } 402 403 extcon_set_cable_state(info->edev, "JIG", attached); 404 405 return 0; 406} 407 408static int max8997_muic_adc_handler(struct max8997_muic_info *info) 409{ 410 int cable_type; 411 bool attached; 412 int ret = 0; 413 414 /* Check cable state which is either detached or attached */ 415 cable_type = max8997_muic_get_cable_type(info, 416 MAX8997_CABLE_GROUP_ADC, &attached); 417 418 switch (cable_type) { 419 case MAX8997_MUIC_ADC_GROUND: 420 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached); 421 if (ret < 0) 422 return ret; 423 break; 424 case MAX8997_MUIC_ADC_MHL: 425 extcon_set_cable_state(info->edev, "MHL", attached); 426 break; 427 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF: 428 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON: 429 ret = max8997_muic_handle_usb(info, 430 MAX8997_USB_DEVICE, attached); 431 if (ret < 0) 432 return ret; 433 break; 434 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD: 435 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON: 436 ret = max8997_muic_handle_dock(info, cable_type, attached); 437 if (ret < 0) 438 return ret; 439 break; 440 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF: 441 ret = max8997_muic_handle_jig_uart(info, attached); 442 break; 443 case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON: 444 case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON: 445 case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON: 446 case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON: 447 case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON: 448 case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON: 449 case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON: 450 case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON: 451 case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON: 452 case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON: 453 case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON: 454 case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON: 455 case MAX8997_MUIC_ADC_RESERVED_ACC_1: 456 case MAX8997_MUIC_ADC_RESERVED_ACC_2: 457 case MAX8997_MUIC_ADC_RESERVED_ACC_3: 458 case MAX8997_MUIC_ADC_RESERVED_ACC_4: 459 case MAX8997_MUIC_ADC_RESERVED_ACC_5: 460 case MAX8997_MUIC_ADC_CEA936_AUDIO: 461 case MAX8997_MUIC_ADC_PHONE_POWERED_DEV: 462 case MAX8997_MUIC_ADC_TTY_CONVERTER: 463 case MAX8997_MUIC_ADC_UART_CABLE: 464 case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG: 465 case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG: 466 case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE: 467 /* 468 * This cable isn't used in general case if it is specially 469 * needed to detect additional cable, should implement 470 * proper operation when this cable is attached/detached. 471 */ 472 dev_info(info->dev, 473 "cable is %s but it isn't used (type:0x%x)\n", 474 attached ? "attached" : "detached", cable_type); 475 return -EAGAIN; 476 default: 477 dev_err(info->dev, 478 "failed to detect %s unknown cable (type:0x%x)\n", 479 attached ? "attached" : "detached", cable_type); 480 return -EINVAL; 481 } 482 483 return 0; 484} 485 486static int max8997_muic_chg_handler(struct max8997_muic_info *info) 487{ 488 int chg_type; 489 bool attached; 490 int adc; 491 492 chg_type = max8997_muic_get_cable_type(info, 493 MAX8997_CABLE_GROUP_CHG, &attached); 494 495 switch (chg_type) { 496 case MAX8997_CHARGER_TYPE_NONE: 497 break; 498 case MAX8997_CHARGER_TYPE_USB: 499 adc = info->status[0] & STATUS1_ADC_MASK; 500 adc >>= STATUS1_ADC_SHIFT; 501 502 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) { 503 max8997_muic_handle_usb(info, 504 MAX8997_USB_DEVICE, attached); 505 } 506 break; 507 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT: 508 extcon_set_cable_state(info->edev, 509 "Charge-downstream", attached); 510 break; 511 case MAX8997_CHARGER_TYPE_DEDICATED_CHG: 512 extcon_set_cable_state(info->edev, "TA", attached); 513 break; 514 case MAX8997_CHARGER_TYPE_500MA: 515 extcon_set_cable_state(info->edev, "Slow-charger", attached); 516 break; 517 case MAX8997_CHARGER_TYPE_1A: 518 extcon_set_cable_state(info->edev, "Fast-charger", attached); 519 break; 520 default: 521 dev_err(info->dev, 522 "failed to detect %s unknown chg cable (type:0x%x)\n", 523 attached ? "attached" : "detached", chg_type); 524 return -EINVAL; 525 } 526 527 return 0; 528} 529 530static void max8997_muic_irq_work(struct work_struct *work) 531{ 532 struct max8997_muic_info *info = container_of(work, 533 struct max8997_muic_info, irq_work); 534 int irq_type = 0; 535 int i, ret; 536 537 if (!info->edev) 538 return; 539 540 mutex_lock(&info->mutex); 541 542 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) 543 if (info->irq == muic_irqs[i].virq) 544 irq_type = muic_irqs[i].irq; 545 546 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1, 547 2, info->status); 548 if (ret) { 549 dev_err(info->dev, "failed to read muic register\n"); 550 mutex_unlock(&info->mutex); 551 return; 552 } 553 554 switch (irq_type) { 555 case MAX8997_MUICIRQ_ADCError: 556 case MAX8997_MUICIRQ_ADCLow: 557 case MAX8997_MUICIRQ_ADC: 558 /* Handle all of cable except for charger cable */ 559 ret = max8997_muic_adc_handler(info); 560 break; 561 case MAX8997_MUICIRQ_VBVolt: 562 case MAX8997_MUICIRQ_DBChg: 563 case MAX8997_MUICIRQ_DCDTmr: 564 case MAX8997_MUICIRQ_ChgDetRun: 565 case MAX8997_MUICIRQ_ChgTyp: 566 /* Handle charger cable */ 567 ret = max8997_muic_chg_handler(info); 568 break; 569 case MAX8997_MUICIRQ_OVP: 570 break; 571 default: 572 dev_info(info->dev, "misc interrupt: irq %d occurred\n", 573 irq_type); 574 mutex_unlock(&info->mutex); 575 return; 576 } 577 578 if (ret < 0) 579 dev_err(info->dev, "failed to handle MUIC interrupt\n"); 580 581 mutex_unlock(&info->mutex); 582 583 return; 584} 585 586static irqreturn_t max8997_muic_irq_handler(int irq, void *data) 587{ 588 struct max8997_muic_info *info = data; 589 590 dev_dbg(info->dev, "irq:%d\n", irq); 591 info->irq = irq; 592 593 schedule_work(&info->irq_work); 594 595 return IRQ_HANDLED; 596} 597 598static int max8997_muic_detect_dev(struct max8997_muic_info *info) 599{ 600 int ret = 0; 601 int adc; 602 int chg_type; 603 bool attached; 604 605 mutex_lock(&info->mutex); 606 607 /* Read STATUSx register to detect accessory */ 608 ret = max8997_bulk_read(info->muic, 609 MAX8997_MUIC_REG_STATUS1, 2, info->status); 610 if (ret) { 611 dev_err(info->dev, "failed to read MUIC register\n"); 612 mutex_unlock(&info->mutex); 613 return ret; 614 } 615 616 adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC, 617 &attached); 618 if (attached && adc != MAX8997_MUIC_ADC_OPEN) { 619 ret = max8997_muic_adc_handler(info); 620 if (ret < 0) { 621 dev_err(info->dev, "Cannot detect ADC cable\n"); 622 mutex_unlock(&info->mutex); 623 return ret; 624 } 625 } 626 627 chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG, 628 &attached); 629 if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) { 630 ret = max8997_muic_chg_handler(info); 631 if (ret < 0) { 632 dev_err(info->dev, "Cannot detect charger cable\n"); 633 mutex_unlock(&info->mutex); 634 return ret; 635 } 636 } 637 638 mutex_unlock(&info->mutex); 639 640 return 0; 641} 642 643static void max8997_muic_detect_cable_wq(struct work_struct *work) 644{ 645 struct max8997_muic_info *info = container_of(to_delayed_work(work), 646 struct max8997_muic_info, wq_detcable); 647 int ret; 648 649 ret = max8997_muic_detect_dev(info); 650 if (ret < 0) 651 dev_err(info->dev, "failed to detect cable type\n"); 652} 653 654static int max8997_muic_probe(struct platform_device *pdev) 655{ 656 struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent); 657 struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev); 658 struct max8997_muic_info *info; 659 int delay_jiffies; 660 int ret, i; 661 662 info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info), 663 GFP_KERNEL); 664 if (!info) 665 return -ENOMEM; 666 667 info->dev = &pdev->dev; 668 info->muic = max8997->muic; 669 670 platform_set_drvdata(pdev, info); 671 mutex_init(&info->mutex); 672 673 INIT_WORK(&info->irq_work, max8997_muic_irq_work); 674 675 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) { 676 struct max8997_muic_irq *muic_irq = &muic_irqs[i]; 677 unsigned int virq = 0; 678 679 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq); 680 if (!virq) { 681 ret = -EINVAL; 682 goto err_irq; 683 } 684 muic_irq->virq = virq; 685 686 ret = request_threaded_irq(virq, NULL, 687 max8997_muic_irq_handler, 688 IRQF_NO_SUSPEND, 689 muic_irq->name, info); 690 if (ret) { 691 dev_err(&pdev->dev, 692 "failed: irq request (IRQ: %d," 693 " error :%d)\n", 694 muic_irq->irq, ret); 695 goto err_irq; 696 } 697 } 698 699 /* External connector */ 700 info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable); 701 if (IS_ERR(info->edev)) { 702 dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); 703 ret = -ENOMEM; 704 goto err_irq; 705 } 706 info->edev->name = DEV_NAME; 707 708 ret = devm_extcon_dev_register(&pdev->dev, info->edev); 709 if (ret) { 710 dev_err(&pdev->dev, "failed to register extcon device\n"); 711 goto err_irq; 712 } 713 714 if (pdata && pdata->muic_pdata) { 715 struct max8997_muic_platform_data *muic_pdata 716 = pdata->muic_pdata; 717 718 /* Initialize registers according to platform data */ 719 for (i = 0; i < muic_pdata->num_init_data; i++) { 720 max8997_write_reg(info->muic, 721 muic_pdata->init_data[i].addr, 722 muic_pdata->init_data[i].data); 723 } 724 725 /* 726 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB 727 * h/w path of COMP2/COMN1 on CONTROL1 register. 728 */ 729 if (muic_pdata->path_uart) 730 info->path_uart = muic_pdata->path_uart; 731 else 732 info->path_uart = CONTROL1_SW_UART; 733 734 if (muic_pdata->path_usb) 735 info->path_usb = muic_pdata->path_usb; 736 else 737 info->path_usb = CONTROL1_SW_USB; 738 739 /* 740 * Default delay time for detecting cable state 741 * after certain time. 742 */ 743 if (muic_pdata->detcable_delay_ms) 744 delay_jiffies = 745 msecs_to_jiffies(muic_pdata->detcable_delay_ms); 746 else 747 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); 748 } else { 749 info->path_uart = CONTROL1_SW_UART; 750 info->path_usb = CONTROL1_SW_USB; 751 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); 752 } 753 754 /* Set initial path for UART */ 755 max8997_muic_set_path(info, info->path_uart, true); 756 757 /* Set ADC debounce time */ 758 max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS); 759 760 /* 761 * Detect accessory after completing the initialization of platform 762 * 763 * - Use delayed workqueue to detect cable state and then 764 * notify cable state to notifiee/platform through uevent. 765 * After completing the booting of platform, the extcon provider 766 * driver should notify cable state to upper layer. 767 */ 768 INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq); 769 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable, 770 delay_jiffies); 771 772 return 0; 773 774err_irq: 775 while (--i >= 0) 776 free_irq(muic_irqs[i].virq, info); 777 return ret; 778} 779 780static int max8997_muic_remove(struct platform_device *pdev) 781{ 782 struct max8997_muic_info *info = platform_get_drvdata(pdev); 783 int i; 784 785 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) 786 free_irq(muic_irqs[i].virq, info); 787 cancel_work_sync(&info->irq_work); 788 789 return 0; 790} 791 792static struct platform_driver max8997_muic_driver = { 793 .driver = { 794 .name = DEV_NAME, 795 .owner = THIS_MODULE, 796 }, 797 .probe = max8997_muic_probe, 798 .remove = max8997_muic_remove, 799}; 800 801module_platform_driver(max8997_muic_driver); 802 803MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver"); 804MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); 805MODULE_LICENSE("GPL"); 806