1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC 4 // 5 // Copyright (C) 2012 Samsung Electronics 6 // Donggeun Kim <dg77.kim@samsung.com> 7 8 #include <linux/devm-helpers.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/i2c.h> 12 #include <linux/slab.h> 13 #include <linux/interrupt.h> 14 #include <linux/err.h> 15 #include <linux/platform_device.h> 16 #include <linux/kobject.h> 17 #include <linux/mfd/max8997.h> 18 #include <linux/mfd/max8997-private.h> 19 #include <linux/extcon-provider.h> 20 #include <linux/irqdomain.h> 21 22 #define DEV_NAME "max8997-muic" 23 #define DELAY_MS_DEFAULT 20000 /* unit: millisecond */ 24 25 enum max8997_muic_adc_debounce_time { 26 ADC_DEBOUNCE_TIME_0_5MS = 0, /* 0.5ms */ 27 ADC_DEBOUNCE_TIME_10MS, /* 10ms */ 28 ADC_DEBOUNCE_TIME_25MS, /* 25ms */ 29 ADC_DEBOUNCE_TIME_38_62MS, /* 38.62ms */ 30 }; 31 32 struct max8997_muic_irq { 33 unsigned int irq; 34 const char *name; 35 unsigned int virq; 36 }; 37 38 static struct max8997_muic_irq muic_irqs[] = { 39 { MAX8997_MUICIRQ_ADCError, "muic-ADCERROR" }, 40 { MAX8997_MUICIRQ_ADCLow, "muic-ADCLOW" }, 41 { MAX8997_MUICIRQ_ADC, "muic-ADC" }, 42 { MAX8997_MUICIRQ_VBVolt, "muic-VBVOLT" }, 43 { MAX8997_MUICIRQ_DBChg, "muic-DBCHG" }, 44 { MAX8997_MUICIRQ_DCDTmr, "muic-DCDTMR" }, 45 { MAX8997_MUICIRQ_ChgDetRun, "muic-CHGDETRUN" }, 46 { MAX8997_MUICIRQ_ChgTyp, "muic-CHGTYP" }, 47 { MAX8997_MUICIRQ_OVP, "muic-OVP" }, 48 { MAX8997_PMICIRQ_CHGINS, "pmic-CHGINS" }, 49 { MAX8997_PMICIRQ_CHGRM, "pmic-CHGRM" }, 50 }; 51 52 /* Define supported cable type */ 53 enum max8997_muic_acc_type { 54 MAX8997_MUIC_ADC_GROUND = 0x0, 55 MAX8997_MUIC_ADC_MHL, /* MHL*/ 56 MAX8997_MUIC_ADC_REMOTE_S1_BUTTON, 57 MAX8997_MUIC_ADC_REMOTE_S2_BUTTON, 58 MAX8997_MUIC_ADC_REMOTE_S3_BUTTON, 59 MAX8997_MUIC_ADC_REMOTE_S4_BUTTON, 60 MAX8997_MUIC_ADC_REMOTE_S5_BUTTON, 61 MAX8997_MUIC_ADC_REMOTE_S6_BUTTON, 62 MAX8997_MUIC_ADC_REMOTE_S7_BUTTON, 63 MAX8997_MUIC_ADC_REMOTE_S8_BUTTON, 64 MAX8997_MUIC_ADC_REMOTE_S9_BUTTON, 65 MAX8997_MUIC_ADC_REMOTE_S10_BUTTON, 66 MAX8997_MUIC_ADC_REMOTE_S11_BUTTON, 67 MAX8997_MUIC_ADC_REMOTE_S12_BUTTON, 68 MAX8997_MUIC_ADC_RESERVED_ACC_1, 69 MAX8997_MUIC_ADC_RESERVED_ACC_2, 70 MAX8997_MUIC_ADC_RESERVED_ACC_3, 71 MAX8997_MUIC_ADC_RESERVED_ACC_4, 72 MAX8997_MUIC_ADC_RESERVED_ACC_5, 73 MAX8997_MUIC_ADC_CEA936_AUDIO, 74 MAX8997_MUIC_ADC_PHONE_POWERED_DEV, 75 MAX8997_MUIC_ADC_TTY_CONVERTER, 76 MAX8997_MUIC_ADC_UART_CABLE, 77 MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG, 78 MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF, /* JIG-USB-OFF */ 79 MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON, /* JIG-USB-ON */ 80 MAX8997_MUIC_ADC_AV_CABLE_NOLOAD, /* DESKDOCK */ 81 MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG, 82 MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF, /* JIG-UART */ 83 MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON, /* CARDOCK */ 84 MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE, 85 MAX8997_MUIC_ADC_OPEN, /* OPEN */ 86 }; 87 88 enum max8997_muic_cable_group { 89 MAX8997_CABLE_GROUP_ADC = 0, 90 MAX8997_CABLE_GROUP_ADC_GND, 91 MAX8997_CABLE_GROUP_CHG, 92 MAX8997_CABLE_GROUP_VBVOLT, 93 }; 94 95 enum max8997_muic_usb_type { 96 MAX8997_USB_HOST, 97 MAX8997_USB_DEVICE, 98 }; 99 100 enum max8997_muic_charger_type { 101 MAX8997_CHARGER_TYPE_NONE = 0, 102 MAX8997_CHARGER_TYPE_USB, 103 MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT, 104 MAX8997_CHARGER_TYPE_DEDICATED_CHG, 105 MAX8997_CHARGER_TYPE_500MA, 106 MAX8997_CHARGER_TYPE_1A, 107 MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7, 108 }; 109 110 struct max8997_muic_info { 111 struct device *dev; 112 struct i2c_client *muic; 113 struct extcon_dev *edev; 114 int prev_cable_type; 115 int prev_chg_type; 116 u8 status[2]; 117 118 int irq; 119 struct work_struct irq_work; 120 struct mutex mutex; 121 122 struct max8997_muic_platform_data *muic_pdata; 123 enum max8997_muic_charger_type pre_charger_type; 124 125 /* 126 * Use delayed workqueue to detect cable state and then 127 * notify cable state to notifiee/platform through uevent. 128 * After completing the booting of platform, the extcon provider 129 * driver should notify cable state to upper layer. 130 */ 131 struct delayed_work wq_detcable; 132 133 /* 134 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB 135 * h/w path of COMP2/COMN1 on CONTROL1 register. 136 */ 137 int path_usb; 138 int path_uart; 139 }; 140 141 static const unsigned int max8997_extcon_cable[] = { 142 EXTCON_USB, 143 EXTCON_USB_HOST, 144 EXTCON_CHG_USB_SDP, 145 EXTCON_CHG_USB_DCP, 146 EXTCON_CHG_USB_FAST, 147 EXTCON_CHG_USB_SLOW, 148 EXTCON_CHG_USB_CDP, 149 EXTCON_DISP_MHL, 150 EXTCON_DOCK, 151 EXTCON_JIG, 152 EXTCON_NONE, 153 }; 154 155 /* 156 * max8997_muic_set_debounce_time - Set the debounce time of ADC 157 * @info: the instance including private data of max8997 MUIC 158 * @time: the debounce time of ADC 159 */ 160 static int max8997_muic_set_debounce_time(struct max8997_muic_info *info, 161 enum max8997_muic_adc_debounce_time time) 162 { 163 int ret; 164 165 switch (time) { 166 case ADC_DEBOUNCE_TIME_0_5MS: 167 case ADC_DEBOUNCE_TIME_10MS: 168 case ADC_DEBOUNCE_TIME_25MS: 169 case ADC_DEBOUNCE_TIME_38_62MS: 170 ret = max8997_update_reg(info->muic, 171 MAX8997_MUIC_REG_CONTROL3, 172 time << CONTROL3_ADCDBSET_SHIFT, 173 CONTROL3_ADCDBSET_MASK); 174 if (ret) { 175 dev_err(info->dev, "failed to set ADC debounce time\n"); 176 return ret; 177 } 178 break; 179 default: 180 dev_err(info->dev, "invalid ADC debounce time\n"); 181 return -EINVAL; 182 } 183 184 return 0; 185 }; 186 187 /* 188 * max8997_muic_set_path - Set hardware line according to attached cable 189 * @info: the instance including private data of max8997 MUIC 190 * @value: the path according to attached cable 191 * @attached: the state of cable (true:attached, false:detached) 192 * 193 * The max8997 MUIC device share outside H/W line among a varity of cables, 194 * so this function set internal path of H/W line according to the type of 195 * attached cable. 196 */ 197 static int max8997_muic_set_path(struct max8997_muic_info *info, 198 u8 val, bool attached) 199 { 200 int ret; 201 u8 ctrl1, ctrl2 = 0; 202 203 if (attached) 204 ctrl1 = val; 205 else 206 ctrl1 = CONTROL1_SW_OPEN; 207 208 ret = max8997_update_reg(info->muic, 209 MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK); 210 if (ret < 0) { 211 dev_err(info->dev, "failed to update MUIC register\n"); 212 return ret; 213 } 214 215 if (attached) 216 ctrl2 |= CONTROL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */ 217 else 218 ctrl2 |= CONTROL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */ 219 220 ret = max8997_update_reg(info->muic, 221 MAX8997_MUIC_REG_CONTROL2, ctrl2, 222 CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK); 223 if (ret < 0) { 224 dev_err(info->dev, "failed to update MUIC register\n"); 225 return ret; 226 } 227 228 dev_info(info->dev, 229 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n", 230 ctrl1, ctrl2, attached ? "attached" : "detached"); 231 232 return 0; 233 } 234 235 /* 236 * max8997_muic_get_cable_type - Return cable type and check cable state 237 * @info: the instance including private data of max8997 MUIC 238 * @group: the path according to attached cable 239 * @attached: store cable state and return 240 * 241 * This function check the cable state either attached or detached, 242 * and then divide precise type of cable according to cable group. 243 * - MAX8997_CABLE_GROUP_ADC 244 * - MAX8997_CABLE_GROUP_CHG 245 */ 246 static int max8997_muic_get_cable_type(struct max8997_muic_info *info, 247 enum max8997_muic_cable_group group, bool *attached) 248 { 249 int cable_type = 0; 250 int adc; 251 int chg_type; 252 253 switch (group) { 254 case MAX8997_CABLE_GROUP_ADC: 255 /* 256 * Read ADC value to check cable type and decide cable state 257 * according to cable type 258 */ 259 adc = info->status[0] & STATUS1_ADC_MASK; 260 adc >>= STATUS1_ADC_SHIFT; 261 262 /* 263 * Check current cable state/cable type and store cable type 264 * (info->prev_cable_type) for handling cable when cable is 265 * detached. 266 */ 267 if (adc == MAX8997_MUIC_ADC_OPEN) { 268 *attached = false; 269 270 cable_type = info->prev_cable_type; 271 info->prev_cable_type = MAX8997_MUIC_ADC_OPEN; 272 } else { 273 *attached = true; 274 275 cable_type = info->prev_cable_type = adc; 276 } 277 break; 278 case MAX8997_CABLE_GROUP_CHG: 279 /* 280 * Read charger type to check cable type and decide cable state 281 * according to type of charger cable. 282 */ 283 chg_type = info->status[1] & STATUS2_CHGTYP_MASK; 284 chg_type >>= STATUS2_CHGTYP_SHIFT; 285 286 if (chg_type == MAX8997_CHARGER_TYPE_NONE) { 287 *attached = false; 288 289 cable_type = info->prev_chg_type; 290 info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE; 291 } else { 292 *attached = true; 293 294 /* 295 * Check current cable state/cable type and store cable 296 * type(info->prev_chg_type) for handling cable when 297 * charger cable is detached. 298 */ 299 cable_type = info->prev_chg_type = chg_type; 300 } 301 302 break; 303 default: 304 dev_err(info->dev, "Unknown cable group (%d)\n", group); 305 cable_type = -EINVAL; 306 break; 307 } 308 309 return cable_type; 310 } 311 312 static int max8997_muic_handle_usb(struct max8997_muic_info *info, 313 enum max8997_muic_usb_type usb_type, bool attached) 314 { 315 int ret = 0; 316 317 ret = max8997_muic_set_path(info, info->path_usb, attached); 318 if (ret < 0) { 319 dev_err(info->dev, "failed to update muic register\n"); 320 return ret; 321 } 322 323 switch (usb_type) { 324 case MAX8997_USB_HOST: 325 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached); 326 break; 327 case MAX8997_USB_DEVICE: 328 extcon_set_state_sync(info->edev, EXTCON_USB, attached); 329 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP, 330 attached); 331 break; 332 default: 333 dev_err(info->dev, "failed to detect %s usb cable\n", 334 attached ? "attached" : "detached"); 335 return -EINVAL; 336 } 337 338 return 0; 339 } 340 341 static int max8997_muic_handle_dock(struct max8997_muic_info *info, 342 int cable_type, bool attached) 343 { 344 int ret = 0; 345 346 ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached); 347 if (ret) { 348 dev_err(info->dev, "failed to update muic register\n"); 349 return ret; 350 } 351 352 switch (cable_type) { 353 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD: 354 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON: 355 extcon_set_state_sync(info->edev, EXTCON_DOCK, attached); 356 break; 357 default: 358 dev_err(info->dev, "failed to detect %s dock device\n", 359 attached ? "attached" : "detached"); 360 return -EINVAL; 361 } 362 363 return 0; 364 } 365 366 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info, 367 bool attached) 368 { 369 int ret = 0; 370 371 /* switch to UART */ 372 ret = max8997_muic_set_path(info, info->path_uart, attached); 373 if (ret) { 374 dev_err(info->dev, "failed to update muic register\n"); 375 return ret; 376 } 377 378 extcon_set_state_sync(info->edev, EXTCON_JIG, attached); 379 380 return 0; 381 } 382 383 static int max8997_muic_adc_handler(struct max8997_muic_info *info) 384 { 385 int cable_type; 386 bool attached; 387 int ret = 0; 388 389 /* Check cable state which is either detached or attached */ 390 cable_type = max8997_muic_get_cable_type(info, 391 MAX8997_CABLE_GROUP_ADC, &attached); 392 393 switch (cable_type) { 394 case MAX8997_MUIC_ADC_GROUND: 395 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached); 396 if (ret < 0) 397 return ret; 398 break; 399 case MAX8997_MUIC_ADC_MHL: 400 extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached); 401 break; 402 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF: 403 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON: 404 ret = max8997_muic_handle_usb(info, 405 MAX8997_USB_DEVICE, attached); 406 if (ret < 0) 407 return ret; 408 break; 409 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD: 410 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON: 411 ret = max8997_muic_handle_dock(info, cable_type, attached); 412 if (ret < 0) 413 return ret; 414 break; 415 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF: 416 ret = max8997_muic_handle_jig_uart(info, attached); 417 break; 418 case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON: 419 case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON: 420 case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON: 421 case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON: 422 case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON: 423 case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON: 424 case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON: 425 case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON: 426 case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON: 427 case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON: 428 case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON: 429 case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON: 430 case MAX8997_MUIC_ADC_RESERVED_ACC_1: 431 case MAX8997_MUIC_ADC_RESERVED_ACC_2: 432 case MAX8997_MUIC_ADC_RESERVED_ACC_3: 433 case MAX8997_MUIC_ADC_RESERVED_ACC_4: 434 case MAX8997_MUIC_ADC_RESERVED_ACC_5: 435 case MAX8997_MUIC_ADC_CEA936_AUDIO: 436 case MAX8997_MUIC_ADC_PHONE_POWERED_DEV: 437 case MAX8997_MUIC_ADC_TTY_CONVERTER: 438 case MAX8997_MUIC_ADC_UART_CABLE: 439 case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG: 440 case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG: 441 case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE: 442 /* 443 * This cable isn't used in general case if it is specially 444 * needed to detect additional cable, should implement 445 * proper operation when this cable is attached/detached. 446 */ 447 dev_info(info->dev, 448 "cable is %s but it isn't used (type:0x%x)\n", 449 attached ? "attached" : "detached", cable_type); 450 return -EAGAIN; 451 default: 452 dev_err(info->dev, 453 "failed to detect %s unknown cable (type:0x%x)\n", 454 attached ? "attached" : "detached", cable_type); 455 return -EINVAL; 456 } 457 458 return 0; 459 } 460 461 static int max8997_muic_chg_handler(struct max8997_muic_info *info) 462 { 463 int chg_type; 464 bool attached; 465 int adc; 466 467 chg_type = max8997_muic_get_cable_type(info, 468 MAX8997_CABLE_GROUP_CHG, &attached); 469 470 switch (chg_type) { 471 case MAX8997_CHARGER_TYPE_NONE: 472 break; 473 case MAX8997_CHARGER_TYPE_USB: 474 adc = info->status[0] & STATUS1_ADC_MASK; 475 adc >>= STATUS1_ADC_SHIFT; 476 477 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) { 478 max8997_muic_handle_usb(info, 479 MAX8997_USB_DEVICE, attached); 480 } 481 break; 482 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT: 483 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP, 484 attached); 485 break; 486 case MAX8997_CHARGER_TYPE_DEDICATED_CHG: 487 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP, 488 attached); 489 break; 490 case MAX8997_CHARGER_TYPE_500MA: 491 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW, 492 attached); 493 break; 494 case MAX8997_CHARGER_TYPE_1A: 495 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST, 496 attached); 497 break; 498 default: 499 dev_err(info->dev, 500 "failed to detect %s unknown chg cable (type:0x%x)\n", 501 attached ? "attached" : "detached", chg_type); 502 return -EINVAL; 503 } 504 505 return 0; 506 } 507 508 static void max8997_muic_irq_work(struct work_struct *work) 509 { 510 struct max8997_muic_info *info = container_of(work, 511 struct max8997_muic_info, irq_work); 512 int irq_type = 0; 513 int i, ret; 514 515 if (!info->edev) 516 return; 517 518 mutex_lock(&info->mutex); 519 520 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) 521 if (info->irq == muic_irqs[i].virq) 522 irq_type = muic_irqs[i].irq; 523 524 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1, 525 2, info->status); 526 if (ret) { 527 dev_err(info->dev, "failed to read muic register\n"); 528 mutex_unlock(&info->mutex); 529 return; 530 } 531 532 switch (irq_type) { 533 case MAX8997_MUICIRQ_ADCError: 534 case MAX8997_MUICIRQ_ADCLow: 535 case MAX8997_MUICIRQ_ADC: 536 /* Handle all of cable except for charger cable */ 537 ret = max8997_muic_adc_handler(info); 538 break; 539 case MAX8997_MUICIRQ_VBVolt: 540 case MAX8997_MUICIRQ_DBChg: 541 case MAX8997_MUICIRQ_DCDTmr: 542 case MAX8997_MUICIRQ_ChgDetRun: 543 case MAX8997_MUICIRQ_ChgTyp: 544 case MAX8997_PMICIRQ_CHGINS: 545 case MAX8997_PMICIRQ_CHGRM: 546 /* Handle charger cable */ 547 ret = max8997_muic_chg_handler(info); 548 break; 549 case MAX8997_MUICIRQ_OVP: 550 break; 551 default: 552 dev_info(info->dev, "misc interrupt: irq %d occurred\n", 553 irq_type); 554 mutex_unlock(&info->mutex); 555 return; 556 } 557 558 if (ret < 0) 559 dev_err(info->dev, "failed to handle MUIC interrupt\n"); 560 561 mutex_unlock(&info->mutex); 562 } 563 564 static irqreturn_t max8997_muic_irq_handler(int irq, void *data) 565 { 566 struct max8997_muic_info *info = data; 567 568 dev_dbg(info->dev, "irq:%d\n", irq); 569 info->irq = irq; 570 571 schedule_work(&info->irq_work); 572 573 return IRQ_HANDLED; 574 } 575 576 static int max8997_muic_detect_dev(struct max8997_muic_info *info) 577 { 578 int ret = 0; 579 int adc; 580 int chg_type; 581 bool attached; 582 583 mutex_lock(&info->mutex); 584 585 /* Read STATUSx register to detect accessory */ 586 ret = max8997_bulk_read(info->muic, 587 MAX8997_MUIC_REG_STATUS1, 2, info->status); 588 if (ret) { 589 dev_err(info->dev, "failed to read MUIC register\n"); 590 mutex_unlock(&info->mutex); 591 return ret; 592 } 593 594 adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC, 595 &attached); 596 if (attached && adc != MAX8997_MUIC_ADC_OPEN) { 597 ret = max8997_muic_adc_handler(info); 598 if (ret < 0) { 599 dev_err(info->dev, "Cannot detect ADC cable\n"); 600 mutex_unlock(&info->mutex); 601 return ret; 602 } 603 } 604 605 chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG, 606 &attached); 607 if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) { 608 ret = max8997_muic_chg_handler(info); 609 if (ret < 0) { 610 dev_err(info->dev, "Cannot detect charger cable\n"); 611 mutex_unlock(&info->mutex); 612 return ret; 613 } 614 } 615 616 mutex_unlock(&info->mutex); 617 618 return 0; 619 } 620 621 static void max8997_muic_detect_cable_wq(struct work_struct *work) 622 { 623 struct max8997_muic_info *info = container_of(to_delayed_work(work), 624 struct max8997_muic_info, wq_detcable); 625 int ret; 626 627 ret = max8997_muic_detect_dev(info); 628 if (ret < 0) 629 dev_err(info->dev, "failed to detect cable type\n"); 630 } 631 632 static int max8997_muic_probe(struct platform_device *pdev) 633 { 634 struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent); 635 struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev); 636 struct max8997_muic_info *info; 637 int delay_jiffies; 638 int cable_type; 639 bool attached; 640 int ret, i; 641 642 info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info), 643 GFP_KERNEL); 644 if (!info) 645 return -ENOMEM; 646 647 info->dev = &pdev->dev; 648 info->muic = max8997->muic; 649 650 platform_set_drvdata(pdev, info); 651 mutex_init(&info->mutex); 652 653 INIT_WORK(&info->irq_work, max8997_muic_irq_work); 654 ret = devm_work_autocancel(&pdev->dev, &info->irq_work, 655 max8997_muic_irq_work); 656 if (ret) 657 return ret; 658 659 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) { 660 struct max8997_muic_irq *muic_irq = &muic_irqs[i]; 661 unsigned int virq = 0; 662 663 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq); 664 if (!virq) 665 return -EINVAL; 666 667 muic_irq->virq = virq; 668 669 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL, 670 max8997_muic_irq_handler, 671 IRQF_NO_SUSPEND, 672 muic_irq->name, info); 673 if (ret) { 674 dev_err(&pdev->dev, 675 "failed: irq request (IRQ: %d, error :%d)\n", 676 muic_irq->irq, ret); 677 return ret; 678 } 679 } 680 681 /* External connector */ 682 info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable); 683 if (IS_ERR(info->edev)) { 684 dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); 685 return PTR_ERR(info->edev); 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 return ret; 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 when JIG is connected to get serial logs */ 735 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1, 736 2, info->status); 737 if (ret) { 738 dev_err(info->dev, "failed to read MUIC register\n"); 739 return ret; 740 } 741 cable_type = max8997_muic_get_cable_type(info, 742 MAX8997_CABLE_GROUP_ADC, &attached); 743 if (attached && cable_type == MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF) 744 max8997_muic_set_path(info, info->path_uart, true); 745 746 /* Set ADC debounce time */ 747 max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS); 748 749 /* 750 * Detect accessory after completing the initialization of platform 751 * 752 * - Use delayed workqueue to detect cable state and then 753 * notify cable state to notifiee/platform through uevent. 754 * After completing the booting of platform, the extcon provider 755 * driver should notify cable state to upper layer. 756 */ 757 INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq); 758 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable, 759 delay_jiffies); 760 761 return 0; 762 } 763 764 static struct platform_driver max8997_muic_driver = { 765 .driver = { 766 .name = DEV_NAME, 767 }, 768 .probe = max8997_muic_probe, 769 }; 770 771 module_platform_driver(max8997_muic_driver); 772 773 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver"); 774 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); 775 MODULE_LICENSE("GPL"); 776 MODULE_ALIAS("platform:max8997-muic"); 777