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 34 enum 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 41 struct max8997_muic_irq { 42 unsigned int irq; 43 const char *name; 44 unsigned int virq; 45 }; 46 47 static 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 */ 60 enum 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 95 enum 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 }; 101 102 enum max8997_muic_usb_type { 103 MAX8997_USB_HOST, 104 MAX8997_USB_DEVICE, 105 }; 106 107 enum 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 }; 116 117 struct 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 }; 147 148 static const unsigned int max8997_extcon_cable[] = { 149 EXTCON_USB, 150 EXTCON_USB_HOST, 151 EXTCON_CHG_USB_SDP, 152 EXTCON_CHG_USB_DCP, 153 EXTCON_CHG_USB_FAST, 154 EXTCON_CHG_USB_SLOW, 155 EXTCON_CHG_USB_CDP, 156 EXTCON_DISP_MHL, 157 EXTCON_DOCK, 158 EXTCON_JIG, 159 EXTCON_NONE, 160 }; 161 162 /* 163 * max8997_muic_set_debounce_time - Set the debounce time of ADC 164 * @info: the instance including private data of max8997 MUIC 165 * @time: the debounce time of ADC 166 */ 167 static int max8997_muic_set_debounce_time(struct max8997_muic_info *info, 168 enum max8997_muic_adc_debounce_time time) 169 { 170 int ret; 171 172 switch (time) { 173 case ADC_DEBOUNCE_TIME_0_5MS: 174 case ADC_DEBOUNCE_TIME_10MS: 175 case ADC_DEBOUNCE_TIME_25MS: 176 case ADC_DEBOUNCE_TIME_38_62MS: 177 ret = max8997_update_reg(info->muic, 178 MAX8997_MUIC_REG_CONTROL3, 179 time << CONTROL3_ADCDBSET_SHIFT, 180 CONTROL3_ADCDBSET_MASK); 181 if (ret) { 182 dev_err(info->dev, "failed to set ADC debounce time\n"); 183 return ret; 184 } 185 break; 186 default: 187 dev_err(info->dev, "invalid ADC debounce time\n"); 188 return -EINVAL; 189 } 190 191 return 0; 192 }; 193 194 /* 195 * max8997_muic_set_path - Set hardware line according to attached cable 196 * @info: the instance including private data of max8997 MUIC 197 * @value: the path according to attached cable 198 * @attached: the state of cable (true:attached, false:detached) 199 * 200 * The max8997 MUIC device share outside H/W line among a varity of cables, 201 * so this function set internal path of H/W line according to the type of 202 * attached cable. 203 */ 204 static int max8997_muic_set_path(struct max8997_muic_info *info, 205 u8 val, bool attached) 206 { 207 int ret = 0; 208 u8 ctrl1, ctrl2 = 0; 209 210 if (attached) 211 ctrl1 = val; 212 else 213 ctrl1 = CONTROL1_SW_OPEN; 214 215 ret = max8997_update_reg(info->muic, 216 MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK); 217 if (ret < 0) { 218 dev_err(info->dev, "failed to update MUIC register\n"); 219 return ret; 220 } 221 222 if (attached) 223 ctrl2 |= CONTROL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */ 224 else 225 ctrl2 |= CONTROL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */ 226 227 ret = max8997_update_reg(info->muic, 228 MAX8997_MUIC_REG_CONTROL2, ctrl2, 229 CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK); 230 if (ret < 0) { 231 dev_err(info->dev, "failed to update MUIC register\n"); 232 return ret; 233 } 234 235 dev_info(info->dev, 236 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n", 237 ctrl1, ctrl2, attached ? "attached" : "detached"); 238 239 return 0; 240 } 241 242 /* 243 * max8997_muic_get_cable_type - Return cable type and check cable state 244 * @info: the instance including private data of max8997 MUIC 245 * @group: the path according to attached cable 246 * @attached: store cable state and return 247 * 248 * This function check the cable state either attached or detached, 249 * and then divide precise type of cable according to cable group. 250 * - MAX8997_CABLE_GROUP_ADC 251 * - MAX8997_CABLE_GROUP_CHG 252 */ 253 static int max8997_muic_get_cable_type(struct max8997_muic_info *info, 254 enum max8997_muic_cable_group group, bool *attached) 255 { 256 int cable_type = 0; 257 int adc; 258 int chg_type; 259 260 switch (group) { 261 case MAX8997_CABLE_GROUP_ADC: 262 /* 263 * Read ADC value to check cable type and decide cable state 264 * according to cable type 265 */ 266 adc = info->status[0] & STATUS1_ADC_MASK; 267 adc >>= STATUS1_ADC_SHIFT; 268 269 /* 270 * Check current cable state/cable type and store cable type 271 * (info->prev_cable_type) for handling cable when cable is 272 * detached. 273 */ 274 if (adc == MAX8997_MUIC_ADC_OPEN) { 275 *attached = false; 276 277 cable_type = info->prev_cable_type; 278 info->prev_cable_type = MAX8997_MUIC_ADC_OPEN; 279 } else { 280 *attached = true; 281 282 cable_type = info->prev_cable_type = adc; 283 } 284 break; 285 case MAX8997_CABLE_GROUP_CHG: 286 /* 287 * Read charger type to check cable type and decide cable state 288 * according to type of charger cable. 289 */ 290 chg_type = info->status[1] & STATUS2_CHGTYP_MASK; 291 chg_type >>= STATUS2_CHGTYP_SHIFT; 292 293 if (chg_type == MAX8997_CHARGER_TYPE_NONE) { 294 *attached = false; 295 296 cable_type = info->prev_chg_type; 297 info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE; 298 } else { 299 *attached = true; 300 301 /* 302 * Check current cable state/cable type and store cable 303 * type(info->prev_chg_type) for handling cable when 304 * charger cable is detached. 305 */ 306 cable_type = info->prev_chg_type = chg_type; 307 } 308 309 break; 310 default: 311 dev_err(info->dev, "Unknown cable group (%d)\n", group); 312 cable_type = -EINVAL; 313 break; 314 } 315 316 return cable_type; 317 } 318 319 static int max8997_muic_handle_usb(struct max8997_muic_info *info, 320 enum max8997_muic_usb_type usb_type, bool attached) 321 { 322 int ret = 0; 323 324 if (usb_type == MAX8997_USB_HOST) { 325 ret = max8997_muic_set_path(info, info->path_usb, attached); 326 if (ret < 0) { 327 dev_err(info->dev, "failed to update muic register\n"); 328 return ret; 329 } 330 } 331 332 switch (usb_type) { 333 case MAX8997_USB_HOST: 334 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached); 335 break; 336 case MAX8997_USB_DEVICE: 337 extcon_set_state_sync(info->edev, EXTCON_USB, attached); 338 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP, 339 attached); 340 break; 341 default: 342 dev_err(info->dev, "failed to detect %s usb cable\n", 343 attached ? "attached" : "detached"); 344 return -EINVAL; 345 } 346 347 return 0; 348 } 349 350 static int max8997_muic_handle_dock(struct max8997_muic_info *info, 351 int cable_type, bool attached) 352 { 353 int ret = 0; 354 355 ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached); 356 if (ret) { 357 dev_err(info->dev, "failed to update muic register\n"); 358 return ret; 359 } 360 361 switch (cable_type) { 362 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD: 363 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON: 364 extcon_set_state_sync(info->edev, EXTCON_DOCK, attached); 365 break; 366 default: 367 dev_err(info->dev, "failed to detect %s dock device\n", 368 attached ? "attached" : "detached"); 369 return -EINVAL; 370 } 371 372 return 0; 373 } 374 375 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info, 376 bool attached) 377 { 378 int ret = 0; 379 380 /* switch to UART */ 381 ret = max8997_muic_set_path(info, info->path_uart, attached); 382 if (ret) { 383 dev_err(info->dev, "failed to update muic register\n"); 384 return ret; 385 } 386 387 extcon_set_state_sync(info->edev, EXTCON_JIG, attached); 388 389 return 0; 390 } 391 392 static int max8997_muic_adc_handler(struct max8997_muic_info *info) 393 { 394 int cable_type; 395 bool attached; 396 int ret = 0; 397 398 /* Check cable state which is either detached or attached */ 399 cable_type = max8997_muic_get_cable_type(info, 400 MAX8997_CABLE_GROUP_ADC, &attached); 401 402 switch (cable_type) { 403 case MAX8997_MUIC_ADC_GROUND: 404 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached); 405 if (ret < 0) 406 return ret; 407 break; 408 case MAX8997_MUIC_ADC_MHL: 409 extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached); 410 break; 411 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF: 412 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON: 413 ret = max8997_muic_handle_usb(info, 414 MAX8997_USB_DEVICE, attached); 415 if (ret < 0) 416 return ret; 417 break; 418 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD: 419 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON: 420 ret = max8997_muic_handle_dock(info, cable_type, attached); 421 if (ret < 0) 422 return ret; 423 break; 424 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF: 425 ret = max8997_muic_handle_jig_uart(info, attached); 426 break; 427 case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON: 428 case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON: 429 case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON: 430 case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON: 431 case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON: 432 case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON: 433 case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON: 434 case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON: 435 case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON: 436 case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON: 437 case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON: 438 case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON: 439 case MAX8997_MUIC_ADC_RESERVED_ACC_1: 440 case MAX8997_MUIC_ADC_RESERVED_ACC_2: 441 case MAX8997_MUIC_ADC_RESERVED_ACC_3: 442 case MAX8997_MUIC_ADC_RESERVED_ACC_4: 443 case MAX8997_MUIC_ADC_RESERVED_ACC_5: 444 case MAX8997_MUIC_ADC_CEA936_AUDIO: 445 case MAX8997_MUIC_ADC_PHONE_POWERED_DEV: 446 case MAX8997_MUIC_ADC_TTY_CONVERTER: 447 case MAX8997_MUIC_ADC_UART_CABLE: 448 case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG: 449 case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG: 450 case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE: 451 /* 452 * This cable isn't used in general case if it is specially 453 * needed to detect additional cable, should implement 454 * proper operation when this cable is attached/detached. 455 */ 456 dev_info(info->dev, 457 "cable is %s but it isn't used (type:0x%x)\n", 458 attached ? "attached" : "detached", cable_type); 459 return -EAGAIN; 460 default: 461 dev_err(info->dev, 462 "failed to detect %s unknown cable (type:0x%x)\n", 463 attached ? "attached" : "detached", cable_type); 464 return -EINVAL; 465 } 466 467 return 0; 468 } 469 470 static int max8997_muic_chg_handler(struct max8997_muic_info *info) 471 { 472 int chg_type; 473 bool attached; 474 int adc; 475 476 chg_type = max8997_muic_get_cable_type(info, 477 MAX8997_CABLE_GROUP_CHG, &attached); 478 479 switch (chg_type) { 480 case MAX8997_CHARGER_TYPE_NONE: 481 break; 482 case MAX8997_CHARGER_TYPE_USB: 483 adc = info->status[0] & STATUS1_ADC_MASK; 484 adc >>= STATUS1_ADC_SHIFT; 485 486 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) { 487 max8997_muic_handle_usb(info, 488 MAX8997_USB_DEVICE, attached); 489 } 490 break; 491 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT: 492 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP, 493 attached); 494 break; 495 case MAX8997_CHARGER_TYPE_DEDICATED_CHG: 496 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP, 497 attached); 498 break; 499 case MAX8997_CHARGER_TYPE_500MA: 500 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW, 501 attached); 502 break; 503 case MAX8997_CHARGER_TYPE_1A: 504 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST, 505 attached); 506 break; 507 default: 508 dev_err(info->dev, 509 "failed to detect %s unknown chg cable (type:0x%x)\n", 510 attached ? "attached" : "detached", chg_type); 511 return -EINVAL; 512 } 513 514 return 0; 515 } 516 517 static void max8997_muic_irq_work(struct work_struct *work) 518 { 519 struct max8997_muic_info *info = container_of(work, 520 struct max8997_muic_info, irq_work); 521 int irq_type = 0; 522 int i, ret; 523 524 if (!info->edev) 525 return; 526 527 mutex_lock(&info->mutex); 528 529 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) 530 if (info->irq == muic_irqs[i].virq) 531 irq_type = muic_irqs[i].irq; 532 533 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1, 534 2, info->status); 535 if (ret) { 536 dev_err(info->dev, "failed to read muic register\n"); 537 mutex_unlock(&info->mutex); 538 return; 539 } 540 541 switch (irq_type) { 542 case MAX8997_MUICIRQ_ADCError: 543 case MAX8997_MUICIRQ_ADCLow: 544 case MAX8997_MUICIRQ_ADC: 545 /* Handle all of cable except for charger cable */ 546 ret = max8997_muic_adc_handler(info); 547 break; 548 case MAX8997_MUICIRQ_VBVolt: 549 case MAX8997_MUICIRQ_DBChg: 550 case MAX8997_MUICIRQ_DCDTmr: 551 case MAX8997_MUICIRQ_ChgDetRun: 552 case MAX8997_MUICIRQ_ChgTyp: 553 /* Handle charger cable */ 554 ret = max8997_muic_chg_handler(info); 555 break; 556 case MAX8997_MUICIRQ_OVP: 557 break; 558 default: 559 dev_info(info->dev, "misc interrupt: irq %d occurred\n", 560 irq_type); 561 mutex_unlock(&info->mutex); 562 return; 563 } 564 565 if (ret < 0) 566 dev_err(info->dev, "failed to handle MUIC interrupt\n"); 567 568 mutex_unlock(&info->mutex); 569 } 570 571 static irqreturn_t max8997_muic_irq_handler(int irq, void *data) 572 { 573 struct max8997_muic_info *info = data; 574 575 dev_dbg(info->dev, "irq:%d\n", irq); 576 info->irq = irq; 577 578 schedule_work(&info->irq_work); 579 580 return IRQ_HANDLED; 581 } 582 583 static int max8997_muic_detect_dev(struct max8997_muic_info *info) 584 { 585 int ret = 0; 586 int adc; 587 int chg_type; 588 bool attached; 589 590 mutex_lock(&info->mutex); 591 592 /* Read STATUSx register to detect accessory */ 593 ret = max8997_bulk_read(info->muic, 594 MAX8997_MUIC_REG_STATUS1, 2, info->status); 595 if (ret) { 596 dev_err(info->dev, "failed to read MUIC register\n"); 597 mutex_unlock(&info->mutex); 598 return ret; 599 } 600 601 adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC, 602 &attached); 603 if (attached && adc != MAX8997_MUIC_ADC_OPEN) { 604 ret = max8997_muic_adc_handler(info); 605 if (ret < 0) { 606 dev_err(info->dev, "Cannot detect ADC cable\n"); 607 mutex_unlock(&info->mutex); 608 return ret; 609 } 610 } 611 612 chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG, 613 &attached); 614 if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) { 615 ret = max8997_muic_chg_handler(info); 616 if (ret < 0) { 617 dev_err(info->dev, "Cannot detect charger cable\n"); 618 mutex_unlock(&info->mutex); 619 return ret; 620 } 621 } 622 623 mutex_unlock(&info->mutex); 624 625 return 0; 626 } 627 628 static void max8997_muic_detect_cable_wq(struct work_struct *work) 629 { 630 struct max8997_muic_info *info = container_of(to_delayed_work(work), 631 struct max8997_muic_info, wq_detcable); 632 int ret; 633 634 ret = max8997_muic_detect_dev(info); 635 if (ret < 0) 636 dev_err(info->dev, "failed to detect cable type\n"); 637 } 638 639 static int max8997_muic_probe(struct platform_device *pdev) 640 { 641 struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent); 642 struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev); 643 struct max8997_muic_info *info; 644 int delay_jiffies; 645 int ret, i; 646 647 info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info), 648 GFP_KERNEL); 649 if (!info) 650 return -ENOMEM; 651 652 info->dev = &pdev->dev; 653 info->muic = max8997->muic; 654 655 platform_set_drvdata(pdev, info); 656 mutex_init(&info->mutex); 657 658 INIT_WORK(&info->irq_work, max8997_muic_irq_work); 659 660 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) { 661 struct max8997_muic_irq *muic_irq = &muic_irqs[i]; 662 unsigned int virq = 0; 663 664 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq); 665 if (!virq) { 666 ret = -EINVAL; 667 goto err_irq; 668 } 669 muic_irq->virq = virq; 670 671 ret = request_threaded_irq(virq, NULL, 672 max8997_muic_irq_handler, 673 IRQF_NO_SUSPEND, 674 muic_irq->name, info); 675 if (ret) { 676 dev_err(&pdev->dev, 677 "failed: irq request (IRQ: %d, error :%d)\n", 678 muic_irq->irq, ret); 679 goto err_irq; 680 } 681 } 682 683 /* External connector */ 684 info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable); 685 if (IS_ERR(info->edev)) { 686 dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); 687 ret = -ENOMEM; 688 goto err_irq; 689 } 690 691 ret = devm_extcon_dev_register(&pdev->dev, info->edev); 692 if (ret) { 693 dev_err(&pdev->dev, "failed to register extcon device\n"); 694 goto err_irq; 695 } 696 697 if (pdata && pdata->muic_pdata) { 698 struct max8997_muic_platform_data *muic_pdata 699 = pdata->muic_pdata; 700 701 /* Initialize registers according to platform data */ 702 for (i = 0; i < muic_pdata->num_init_data; i++) { 703 max8997_write_reg(info->muic, 704 muic_pdata->init_data[i].addr, 705 muic_pdata->init_data[i].data); 706 } 707 708 /* 709 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB 710 * h/w path of COMP2/COMN1 on CONTROL1 register. 711 */ 712 if (muic_pdata->path_uart) 713 info->path_uart = muic_pdata->path_uart; 714 else 715 info->path_uart = CONTROL1_SW_UART; 716 717 if (muic_pdata->path_usb) 718 info->path_usb = muic_pdata->path_usb; 719 else 720 info->path_usb = CONTROL1_SW_USB; 721 722 /* 723 * Default delay time for detecting cable state 724 * after certain time. 725 */ 726 if (muic_pdata->detcable_delay_ms) 727 delay_jiffies = 728 msecs_to_jiffies(muic_pdata->detcable_delay_ms); 729 else 730 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); 731 } else { 732 info->path_uart = CONTROL1_SW_UART; 733 info->path_usb = CONTROL1_SW_USB; 734 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); 735 } 736 737 /* Set initial path for UART */ 738 max8997_muic_set_path(info, info->path_uart, true); 739 740 /* Set ADC debounce time */ 741 max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS); 742 743 /* 744 * Detect accessory after completing the initialization of platform 745 * 746 * - Use delayed workqueue to detect cable state and then 747 * notify cable state to notifiee/platform through uevent. 748 * After completing the booting of platform, the extcon provider 749 * driver should notify cable state to upper layer. 750 */ 751 INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq); 752 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable, 753 delay_jiffies); 754 755 return 0; 756 757 err_irq: 758 while (--i >= 0) 759 free_irq(muic_irqs[i].virq, info); 760 return ret; 761 } 762 763 static int max8997_muic_remove(struct platform_device *pdev) 764 { 765 struct max8997_muic_info *info = platform_get_drvdata(pdev); 766 int i; 767 768 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) 769 free_irq(muic_irqs[i].virq, info); 770 cancel_work_sync(&info->irq_work); 771 772 return 0; 773 } 774 775 static struct platform_driver max8997_muic_driver = { 776 .driver = { 777 .name = DEV_NAME, 778 }, 779 .probe = max8997_muic_probe, 780 .remove = max8997_muic_remove, 781 }; 782 783 module_platform_driver(max8997_muic_driver); 784 785 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver"); 786 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); 787 MODULE_LICENSE("GPL"); 788