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