1// SPDX-License-Identifier: GPL-2.0+ 2// 3// extcon-max14577.c - MAX14577/77836 extcon driver to support MUIC 4// 5// Copyright (C) 2013,2014 Samsung Electronics 6// Chanwoo Choi <cw00.choi@samsung.com> 7// Krzysztof Kozlowski <krzk@kernel.org> 8 9#include <linux/devm-helpers.h> 10#include <linux/kernel.h> 11#include <linux/module.h> 12#include <linux/i2c.h> 13#include <linux/interrupt.h> 14#include <linux/platform_device.h> 15#include <linux/mfd/max14577.h> 16#include <linux/mfd/max14577-private.h> 17#include <linux/extcon-provider.h> 18 19#define DELAY_MS_DEFAULT 17000 /* unit: millisecond */ 20 21enum max14577_muic_adc_debounce_time { 22 ADC_DEBOUNCE_TIME_5MS = 0, 23 ADC_DEBOUNCE_TIME_10MS, 24 ADC_DEBOUNCE_TIME_25MS, 25 ADC_DEBOUNCE_TIME_38_62MS, 26}; 27 28enum max14577_muic_status { 29 MAX14577_MUIC_STATUS1 = 0, 30 MAX14577_MUIC_STATUS2 = 1, 31 MAX14577_MUIC_STATUS_END, 32}; 33 34/** 35 * struct max14577_muic_irq 36 * @irq: the index of irq list of MUIC device. 37 * @name: the name of irq. 38 * @virq: the virtual irq to use irq domain 39 */ 40struct max14577_muic_irq { 41 unsigned int irq; 42 const char *name; 43 unsigned int virq; 44}; 45 46static struct max14577_muic_irq max14577_muic_irqs[] = { 47 { MAX14577_IRQ_INT1_ADC, "muic-ADC" }, 48 { MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" }, 49 { MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" }, 50 { MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" }, 51 { MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" }, 52 { MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" }, 53 { MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" }, 54 { MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" }, 55}; 56 57static struct max14577_muic_irq max77836_muic_irqs[] = { 58 { MAX14577_IRQ_INT1_ADC, "muic-ADC" }, 59 { MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" }, 60 { MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" }, 61 { MAX77836_IRQ_INT1_ADC1K, "muic-ADC1K" }, 62 { MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" }, 63 { MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" }, 64 { MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" }, 65 { MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" }, 66 { MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" }, 67 { MAX77836_IRQ_INT2_VIDRM, "muic-VIDRM" }, 68}; 69 70struct max14577_muic_info { 71 struct device *dev; 72 struct max14577 *max14577; 73 struct extcon_dev *edev; 74 int prev_cable_type; 75 int prev_chg_type; 76 u8 status[MAX14577_MUIC_STATUS_END]; 77 78 struct max14577_muic_irq *muic_irqs; 79 unsigned int muic_irqs_num; 80 bool irq_adc; 81 bool irq_chg; 82 struct work_struct irq_work; 83 struct mutex mutex; 84 85 /* 86 * Use delayed workqueue to detect cable state and then 87 * notify cable state to notifiee/platform through uevent. 88 * After completing the booting of platform, the extcon provider 89 * driver should notify cable state to upper layer. 90 */ 91 struct delayed_work wq_detcable; 92 93 /* 94 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB 95 * h/w path of COMP2/COMN1 on CONTROL1 register. 96 */ 97 int path_usb; 98 int path_uart; 99}; 100 101enum max14577_muic_cable_group { 102 MAX14577_CABLE_GROUP_ADC = 0, 103 MAX14577_CABLE_GROUP_CHG, 104}; 105 106/* Define supported accessory type */ 107enum max14577_muic_acc_type { 108 MAX14577_MUIC_ADC_GROUND = 0x0, 109 MAX14577_MUIC_ADC_SEND_END_BUTTON, 110 MAX14577_MUIC_ADC_REMOTE_S1_BUTTON, 111 MAX14577_MUIC_ADC_REMOTE_S2_BUTTON, 112 MAX14577_MUIC_ADC_REMOTE_S3_BUTTON, 113 MAX14577_MUIC_ADC_REMOTE_S4_BUTTON, 114 MAX14577_MUIC_ADC_REMOTE_S5_BUTTON, 115 MAX14577_MUIC_ADC_REMOTE_S6_BUTTON, 116 MAX14577_MUIC_ADC_REMOTE_S7_BUTTON, 117 MAX14577_MUIC_ADC_REMOTE_S8_BUTTON, 118 MAX14577_MUIC_ADC_REMOTE_S9_BUTTON, 119 MAX14577_MUIC_ADC_REMOTE_S10_BUTTON, 120 MAX14577_MUIC_ADC_REMOTE_S11_BUTTON, 121 MAX14577_MUIC_ADC_REMOTE_S12_BUTTON, 122 MAX14577_MUIC_ADC_RESERVED_ACC_1, 123 MAX14577_MUIC_ADC_RESERVED_ACC_2, 124 MAX14577_MUIC_ADC_RESERVED_ACC_3, 125 MAX14577_MUIC_ADC_RESERVED_ACC_4, 126 MAX14577_MUIC_ADC_RESERVED_ACC_5, 127 MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2, 128 MAX14577_MUIC_ADC_PHONE_POWERED_DEV, 129 MAX14577_MUIC_ADC_TTY_CONVERTER, 130 MAX14577_MUIC_ADC_UART_CABLE, 131 MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG, 132 MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF, 133 MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON, 134 MAX14577_MUIC_ADC_AV_CABLE_NOLOAD, 135 MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG, 136 MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF, 137 MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON, 138 MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */ 139 MAX14577_MUIC_ADC_OPEN, 140}; 141 142static const unsigned int max14577_extcon_cable[] = { 143 EXTCON_USB, 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_JIG, 150 EXTCON_NONE, 151}; 152 153/* 154 * max14577_muic_set_debounce_time - Set the debounce time of ADC 155 * @info: the instance including private data of max14577 MUIC 156 * @time: the debounce time of ADC 157 */ 158static int max14577_muic_set_debounce_time(struct max14577_muic_info *info, 159 enum max14577_muic_adc_debounce_time time) 160{ 161 u8 ret; 162 163 switch (time) { 164 case ADC_DEBOUNCE_TIME_5MS: 165 case ADC_DEBOUNCE_TIME_10MS: 166 case ADC_DEBOUNCE_TIME_25MS: 167 case ADC_DEBOUNCE_TIME_38_62MS: 168 ret = max14577_update_reg(info->max14577->regmap, 169 MAX14577_MUIC_REG_CONTROL3, 170 CTRL3_ADCDBSET_MASK, 171 time << CTRL3_ADCDBSET_SHIFT); 172 if (ret) { 173 dev_err(info->dev, "failed to set ADC debounce time\n"); 174 return ret; 175 } 176 break; 177 default: 178 dev_err(info->dev, "invalid ADC debounce time\n"); 179 return -EINVAL; 180 } 181 182 return 0; 183}; 184 185/* 186 * max14577_muic_set_path - Set hardware line according to attached cable 187 * @info: the instance including private data of max14577 MUIC 188 * @value: the path according to attached cable 189 * @attached: the state of cable (true:attached, false:detached) 190 * 191 * The max14577 MUIC device share outside H/W line among a varity of cables 192 * so, this function set internal path of H/W line according to the type of 193 * attached cable. 194 */ 195static int max14577_muic_set_path(struct max14577_muic_info *info, 196 u8 val, bool attached) 197{ 198 u8 ctrl1, ctrl2 = 0; 199 int ret; 200 201 /* Set open state to path before changing hw path */ 202 ret = max14577_update_reg(info->max14577->regmap, 203 MAX14577_MUIC_REG_CONTROL1, 204 CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN); 205 if (ret < 0) { 206 dev_err(info->dev, "failed to update MUIC register\n"); 207 return ret; 208 } 209 210 if (attached) 211 ctrl1 = val; 212 else 213 ctrl1 = CTRL1_SW_OPEN; 214 215 ret = max14577_update_reg(info->max14577->regmap, 216 MAX14577_MUIC_REG_CONTROL1, 217 CLEAR_IDBEN_MICEN_MASK, ctrl1); 218 if (ret < 0) { 219 dev_err(info->dev, "failed to update MUIC register\n"); 220 return ret; 221 } 222 223 if (attached) 224 ctrl2 |= CTRL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */ 225 else 226 ctrl2 |= CTRL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */ 227 228 ret = max14577_update_reg(info->max14577->regmap, 229 MAX14577_REG_CONTROL2, 230 CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2); 231 if (ret < 0) { 232 dev_err(info->dev, "failed to update MUIC register\n"); 233 return ret; 234 } 235 236 dev_dbg(info->dev, 237 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n", 238 ctrl1, ctrl2, attached ? "attached" : "detached"); 239 240 return 0; 241} 242 243/* 244 * max14577_muic_get_cable_type - Return cable type and check cable state 245 * @info: the instance including private data of max14577 MUIC 246 * @group: the path according to attached cable 247 * @attached: store cable state and return 248 * 249 * This function check the cable state either attached or detached, 250 * and then divide precise type of cable according to cable group. 251 * - max14577_CABLE_GROUP_ADC 252 * - max14577_CABLE_GROUP_CHG 253 */ 254static int max14577_muic_get_cable_type(struct max14577_muic_info *info, 255 enum max14577_muic_cable_group group, bool *attached) 256{ 257 int cable_type = 0; 258 int adc; 259 int chg_type; 260 261 switch (group) { 262 case MAX14577_CABLE_GROUP_ADC: 263 /* 264 * Read ADC value to check cable type and decide cable state 265 * according to cable type 266 */ 267 adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK; 268 adc >>= STATUS1_ADC_SHIFT; 269 270 /* 271 * Check current cable state/cable type and store cable type 272 * (info->prev_cable_type) for handling cable when cable is 273 * detached. 274 */ 275 if (adc == MAX14577_MUIC_ADC_OPEN) { 276 *attached = false; 277 278 cable_type = info->prev_cable_type; 279 info->prev_cable_type = MAX14577_MUIC_ADC_OPEN; 280 } else { 281 *attached = true; 282 283 cable_type = info->prev_cable_type = adc; 284 } 285 break; 286 case MAX14577_CABLE_GROUP_CHG: 287 /* 288 * Read charger type to check cable type and decide cable state 289 * according to type of charger cable. 290 */ 291 chg_type = info->status[MAX14577_MUIC_STATUS2] & 292 STATUS2_CHGTYP_MASK; 293 chg_type >>= STATUS2_CHGTYP_SHIFT; 294 295 if (chg_type == MAX14577_CHARGER_TYPE_NONE) { 296 *attached = false; 297 298 cable_type = info->prev_chg_type; 299 info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE; 300 } else { 301 *attached = true; 302 303 /* 304 * Check current cable state/cable type and store cable 305 * type(info->prev_chg_type) for handling cable when 306 * charger cable is detached. 307 */ 308 cable_type = info->prev_chg_type = chg_type; 309 } 310 311 break; 312 default: 313 dev_err(info->dev, "Unknown cable group (%d)\n", group); 314 cable_type = -EINVAL; 315 break; 316 } 317 318 return cable_type; 319} 320 321static int max14577_muic_jig_handler(struct max14577_muic_info *info, 322 int cable_type, bool attached) 323{ 324 int ret = 0; 325 u8 path = CTRL1_SW_OPEN; 326 327 dev_dbg(info->dev, 328 "external connector is %s (adc:0x%02x)\n", 329 attached ? "attached" : "detached", cable_type); 330 331 switch (cable_type) { 332 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: /* ADC_JIG_USB_OFF */ 333 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: /* ADC_JIG_USB_ON */ 334 /* PATH:AP_USB */ 335 path = CTRL1_SW_USB; 336 break; 337 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: /* ADC_JIG_UART_OFF */ 338 /* PATH:AP_UART */ 339 path = CTRL1_SW_UART; 340 break; 341 default: 342 dev_err(info->dev, "failed to detect %s jig cable\n", 343 attached ? "attached" : "detached"); 344 return -EINVAL; 345 } 346 347 ret = max14577_muic_set_path(info, path, attached); 348 if (ret < 0) 349 return ret; 350 351 extcon_set_state_sync(info->edev, EXTCON_JIG, attached); 352 353 return 0; 354} 355 356static int max14577_muic_adc_handler(struct max14577_muic_info *info) 357{ 358 int cable_type; 359 bool attached; 360 int ret = 0; 361 362 /* Check accessory state which is either detached or attached */ 363 cable_type = max14577_muic_get_cable_type(info, 364 MAX14577_CABLE_GROUP_ADC, &attached); 365 366 dev_dbg(info->dev, 367 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n", 368 attached ? "attached" : "detached", cable_type, 369 info->prev_cable_type); 370 371 switch (cable_type) { 372 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: 373 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: 374 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: 375 /* JIG */ 376 ret = max14577_muic_jig_handler(info, cable_type, attached); 377 if (ret < 0) 378 return ret; 379 break; 380 case MAX14577_MUIC_ADC_GROUND: 381 case MAX14577_MUIC_ADC_SEND_END_BUTTON: 382 case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON: 383 case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON: 384 case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON: 385 case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON: 386 case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON: 387 case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON: 388 case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON: 389 case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON: 390 case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON: 391 case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON: 392 case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON: 393 case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON: 394 case MAX14577_MUIC_ADC_RESERVED_ACC_1: 395 case MAX14577_MUIC_ADC_RESERVED_ACC_2: 396 case MAX14577_MUIC_ADC_RESERVED_ACC_3: 397 case MAX14577_MUIC_ADC_RESERVED_ACC_4: 398 case MAX14577_MUIC_ADC_RESERVED_ACC_5: 399 case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2: 400 case MAX14577_MUIC_ADC_PHONE_POWERED_DEV: 401 case MAX14577_MUIC_ADC_TTY_CONVERTER: 402 case MAX14577_MUIC_ADC_UART_CABLE: 403 case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG: 404 case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD: 405 case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG: 406 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON: 407 case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1: 408 /* 409 * This accessory isn't used in general case if it is specially 410 * needed to detect additional accessory, should implement 411 * proper operation when this accessory is attached/detached. 412 */ 413 dev_info(info->dev, 414 "accessory is %s but it isn't used (adc:0x%x)\n", 415 attached ? "attached" : "detached", cable_type); 416 return -EAGAIN; 417 default: 418 dev_err(info->dev, 419 "failed to detect %s accessory (adc:0x%x)\n", 420 attached ? "attached" : "detached", cable_type); 421 return -EINVAL; 422 } 423 424 return 0; 425} 426 427static int max14577_muic_chg_handler(struct max14577_muic_info *info) 428{ 429 int chg_type; 430 bool attached; 431 int ret = 0; 432 433 chg_type = max14577_muic_get_cable_type(info, 434 MAX14577_CABLE_GROUP_CHG, &attached); 435 436 dev_dbg(info->dev, 437 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n", 438 attached ? "attached" : "detached", 439 chg_type, info->prev_chg_type); 440 441 switch (chg_type) { 442 case MAX14577_CHARGER_TYPE_USB: 443 /* PATH:AP_USB */ 444 ret = max14577_muic_set_path(info, info->path_usb, attached); 445 if (ret < 0) 446 return ret; 447 448 extcon_set_state_sync(info->edev, EXTCON_USB, attached); 449 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP, 450 attached); 451 break; 452 case MAX14577_CHARGER_TYPE_DEDICATED_CHG: 453 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP, 454 attached); 455 break; 456 case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT: 457 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP, 458 attached); 459 break; 460 case MAX14577_CHARGER_TYPE_SPECIAL_500MA: 461 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW, 462 attached); 463 break; 464 case MAX14577_CHARGER_TYPE_SPECIAL_1A: 465 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST, 466 attached); 467 break; 468 case MAX14577_CHARGER_TYPE_NONE: 469 case MAX14577_CHARGER_TYPE_DEAD_BATTERY: 470 break; 471 default: 472 dev_err(info->dev, 473 "failed to detect %s accessory (chg_type:0x%x)\n", 474 attached ? "attached" : "detached", chg_type); 475 return -EINVAL; 476 } 477 478 return 0; 479} 480 481static void max14577_muic_irq_work(struct work_struct *work) 482{ 483 struct max14577_muic_info *info = container_of(work, 484 struct max14577_muic_info, irq_work); 485 int ret = 0; 486 487 if (!info->edev) 488 return; 489 490 mutex_lock(&info->mutex); 491 492 ret = max14577_bulk_read(info->max14577->regmap, 493 MAX14577_MUIC_REG_STATUS1, info->status, 2); 494 if (ret) { 495 dev_err(info->dev, "failed to read MUIC register\n"); 496 mutex_unlock(&info->mutex); 497 return; 498 } 499 500 if (info->irq_adc) { 501 ret = max14577_muic_adc_handler(info); 502 info->irq_adc = false; 503 } 504 if (info->irq_chg) { 505 ret = max14577_muic_chg_handler(info); 506 info->irq_chg = false; 507 } 508 509 if (ret < 0) 510 dev_err(info->dev, "failed to handle MUIC interrupt\n"); 511 512 mutex_unlock(&info->mutex); 513} 514 515/* 516 * Sets irq_adc or irq_chg in max14577_muic_info and returns 1. 517 * Returns 0 if irq_type does not match registered IRQ for this device type. 518 */ 519static int max14577_parse_irq(struct max14577_muic_info *info, int irq_type) 520{ 521 switch (irq_type) { 522 case MAX14577_IRQ_INT1_ADC: 523 case MAX14577_IRQ_INT1_ADCLOW: 524 case MAX14577_IRQ_INT1_ADCERR: 525 /* 526 * Handle all of accessory except for 527 * type of charger accessory. 528 */ 529 info->irq_adc = true; 530 return 1; 531 case MAX14577_IRQ_INT2_CHGTYP: 532 case MAX14577_IRQ_INT2_CHGDETRUN: 533 case MAX14577_IRQ_INT2_DCDTMR: 534 case MAX14577_IRQ_INT2_DBCHG: 535 case MAX14577_IRQ_INT2_VBVOLT: 536 /* Handle charger accessory */ 537 info->irq_chg = true; 538 return 1; 539 default: 540 return 0; 541 } 542} 543 544/* 545 * Sets irq_adc or irq_chg in max14577_muic_info and returns 1. 546 * Returns 0 if irq_type does not match registered IRQ for this device type. 547 */ 548static int max77836_parse_irq(struct max14577_muic_info *info, int irq_type) 549{ 550 /* First check common max14577 interrupts */ 551 if (max14577_parse_irq(info, irq_type)) 552 return 1; 553 554 switch (irq_type) { 555 case MAX77836_IRQ_INT1_ADC1K: 556 info->irq_adc = true; 557 return 1; 558 case MAX77836_IRQ_INT2_VIDRM: 559 /* Handle charger accessory */ 560 info->irq_chg = true; 561 return 1; 562 default: 563 return 0; 564 } 565} 566 567static irqreturn_t max14577_muic_irq_handler(int irq, void *data) 568{ 569 struct max14577_muic_info *info = data; 570 int i, irq_type = -1; 571 bool irq_parsed; 572 573 /* 574 * We may be called multiple times for different nested IRQ-s. 575 * Including changes in INT1_ADC and INT2_CGHTYP at once. 576 * However we only need to know whether it was ADC, charger 577 * or both interrupts so decode IRQ and turn on proper flags. 578 */ 579 for (i = 0; i < info->muic_irqs_num; i++) 580 if (irq == info->muic_irqs[i].virq) 581 irq_type = info->muic_irqs[i].irq; 582 583 switch (info->max14577->dev_type) { 584 case MAXIM_DEVICE_TYPE_MAX77836: 585 irq_parsed = max77836_parse_irq(info, irq_type); 586 break; 587 case MAXIM_DEVICE_TYPE_MAX14577: 588 default: 589 irq_parsed = max14577_parse_irq(info, irq_type); 590 break; 591 } 592 593 if (!irq_parsed) { 594 dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n", 595 irq_type); 596 return IRQ_HANDLED; 597 } 598 schedule_work(&info->irq_work); 599 600 return IRQ_HANDLED; 601} 602 603static int max14577_muic_detect_accessory(struct max14577_muic_info *info) 604{ 605 int ret = 0; 606 int adc; 607 int chg_type; 608 bool attached; 609 610 mutex_lock(&info->mutex); 611 612 /* Read STATUSx register to detect accessory */ 613 ret = max14577_bulk_read(info->max14577->regmap, 614 MAX14577_MUIC_REG_STATUS1, info->status, 2); 615 if (ret) { 616 dev_err(info->dev, "failed to read MUIC register\n"); 617 mutex_unlock(&info->mutex); 618 return ret; 619 } 620 621 adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC, 622 &attached); 623 if (attached && adc != MAX14577_MUIC_ADC_OPEN) { 624 ret = max14577_muic_adc_handler(info); 625 if (ret < 0) { 626 dev_err(info->dev, "Cannot detect accessory\n"); 627 mutex_unlock(&info->mutex); 628 return ret; 629 } 630 } 631 632 chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG, 633 &attached); 634 if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) { 635 ret = max14577_muic_chg_handler(info); 636 if (ret < 0) { 637 dev_err(info->dev, "Cannot detect charger accessory\n"); 638 mutex_unlock(&info->mutex); 639 return ret; 640 } 641 } 642 643 mutex_unlock(&info->mutex); 644 645 return 0; 646} 647 648static void max14577_muic_detect_cable_wq(struct work_struct *work) 649{ 650 struct max14577_muic_info *info = container_of(to_delayed_work(work), 651 struct max14577_muic_info, wq_detcable); 652 653 max14577_muic_detect_accessory(info); 654} 655 656static int max14577_muic_probe(struct platform_device *pdev) 657{ 658 struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); 659 struct max14577_muic_info *info; 660 int delay_jiffies; 661 int cable_type; 662 bool attached; 663 int ret; 664 int i; 665 u8 id; 666 667 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 668 if (!info) 669 return -ENOMEM; 670 671 info->dev = &pdev->dev; 672 info->max14577 = max14577; 673 674 platform_set_drvdata(pdev, info); 675 mutex_init(&info->mutex); 676 677 ret = devm_work_autocancel(&pdev->dev, &info->irq_work, 678 max14577_muic_irq_work); 679 if (ret) 680 return ret; 681 682 switch (max14577->dev_type) { 683 case MAXIM_DEVICE_TYPE_MAX77836: 684 info->muic_irqs = max77836_muic_irqs; 685 info->muic_irqs_num = ARRAY_SIZE(max77836_muic_irqs); 686 break; 687 case MAXIM_DEVICE_TYPE_MAX14577: 688 default: 689 info->muic_irqs = max14577_muic_irqs; 690 info->muic_irqs_num = ARRAY_SIZE(max14577_muic_irqs); 691 } 692 693 /* Support irq domain for max14577 MUIC device */ 694 for (i = 0; i < info->muic_irqs_num; i++) { 695 struct max14577_muic_irq *muic_irq = &info->muic_irqs[i]; 696 int virq = 0; 697 698 virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq); 699 if (virq <= 0) 700 return -EINVAL; 701 muic_irq->virq = virq; 702 703 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL, 704 max14577_muic_irq_handler, 705 IRQF_NO_SUSPEND, 706 muic_irq->name, info); 707 if (ret) { 708 dev_err(&pdev->dev, 709 "failed: irq request (IRQ: %d, error :%d)\n", 710 muic_irq->irq, ret); 711 return ret; 712 } 713 } 714 715 /* Initialize extcon device */ 716 info->edev = devm_extcon_dev_allocate(&pdev->dev, 717 max14577_extcon_cable); 718 if (IS_ERR(info->edev)) { 719 dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); 720 return PTR_ERR(info->edev); 721 } 722 723 ret = devm_extcon_dev_register(&pdev->dev, info->edev); 724 if (ret) { 725 dev_err(&pdev->dev, "failed to register extcon device\n"); 726 return ret; 727 } 728 729 /* Default h/w line path */ 730 info->path_usb = CTRL1_SW_USB; 731 info->path_uart = CTRL1_SW_UART; 732 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); 733 734 /* Set initial path for UART when JIG is connected to get serial logs */ 735 ret = max14577_bulk_read(info->max14577->regmap, 736 MAX14577_MUIC_REG_STATUS1, info->status, 2); 737 if (ret) { 738 dev_err(info->dev, "Cannot read STATUS registers\n"); 739 return ret; 740 } 741 cable_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC, 742 &attached); 743 if (attached && cable_type == MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF) 744 max14577_muic_set_path(info, info->path_uart, true); 745 746 /* Check revision number of MUIC device*/ 747 ret = max14577_read_reg(info->max14577->regmap, 748 MAX14577_REG_DEVICEID, &id); 749 if (ret < 0) { 750 dev_err(&pdev->dev, "failed to read revision number\n"); 751 return ret; 752 } 753 dev_info(info->dev, "device ID : 0x%x\n", id); 754 755 /* Set ADC debounce time */ 756 max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS); 757 758 /* 759 * Detect accessory after completing the initialization of platform 760 * 761 * - Use delayed workqueue to detect cable state and then 762 * notify cable state to notifiee/platform through uevent. 763 * After completing the booting of platform, the extcon provider 764 * driver should notify cable state to upper layer. 765 */ 766 INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq); 767 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable, 768 delay_jiffies); 769 770 return ret; 771} 772 773static const struct platform_device_id max14577_muic_id[] = { 774 { "max14577-muic", MAXIM_DEVICE_TYPE_MAX14577, }, 775 { "max77836-muic", MAXIM_DEVICE_TYPE_MAX77836, }, 776 { } 777}; 778MODULE_DEVICE_TABLE(platform, max14577_muic_id); 779 780static const struct of_device_id of_max14577_muic_dt_match[] = { 781 { .compatible = "maxim,max14577-muic", 782 .data = (void *)MAXIM_DEVICE_TYPE_MAX14577, }, 783 { .compatible = "maxim,max77836-muic", 784 .data = (void *)MAXIM_DEVICE_TYPE_MAX77836, }, 785 { }, 786}; 787MODULE_DEVICE_TABLE(of, of_max14577_muic_dt_match); 788 789static struct platform_driver max14577_muic_driver = { 790 .driver = { 791 .name = "max14577-muic", 792 .of_match_table = of_max14577_muic_dt_match, 793 }, 794 .probe = max14577_muic_probe, 795 .id_table = max14577_muic_id, 796}; 797 798module_platform_driver(max14577_muic_driver); 799 800MODULE_DESCRIPTION("Maxim 14577/77836 Extcon driver"); 801MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>"); 802MODULE_LICENSE("GPL"); 803MODULE_ALIAS("platform:extcon-max14577"); 804