1 /* 2 * extcon-max14577.c - MAX14577/77836 extcon driver to support MUIC 3 * 4 * Copyright (C) 2013,2014 Samsung Electronics 5 * Chanwoo Choi <cw00.choi@samsung.com> 6 * Krzysztof Kozlowski <k.kozlowski@samsung.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 */ 18 19 #include <linux/kernel.h> 20 #include <linux/module.h> 21 #include <linux/i2c.h> 22 #include <linux/interrupt.h> 23 #include <linux/platform_device.h> 24 #include <linux/mfd/max14577.h> 25 #include <linux/mfd/max14577-private.h> 26 #include <linux/extcon.h> 27 28 #define DELAY_MS_DEFAULT 17000 /* unit: millisecond */ 29 30 enum max14577_muic_adc_debounce_time { 31 ADC_DEBOUNCE_TIME_5MS = 0, 32 ADC_DEBOUNCE_TIME_10MS, 33 ADC_DEBOUNCE_TIME_25MS, 34 ADC_DEBOUNCE_TIME_38_62MS, 35 }; 36 37 enum max14577_muic_status { 38 MAX14577_MUIC_STATUS1 = 0, 39 MAX14577_MUIC_STATUS2 = 1, 40 MAX14577_MUIC_STATUS_END, 41 }; 42 43 /** 44 * struct max14577_muic_irq 45 * @irq: the index of irq list of MUIC device. 46 * @name: the name of irq. 47 * @virq: the virtual irq to use irq domain 48 */ 49 struct max14577_muic_irq { 50 unsigned int irq; 51 const char *name; 52 unsigned int virq; 53 }; 54 55 static struct max14577_muic_irq max14577_muic_irqs[] = { 56 { MAX14577_IRQ_INT1_ADC, "muic-ADC" }, 57 { MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" }, 58 { MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" }, 59 { MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" }, 60 { MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" }, 61 { MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" }, 62 { MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" }, 63 { MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" }, 64 }; 65 66 static struct max14577_muic_irq max77836_muic_irqs[] = { 67 { MAX14577_IRQ_INT1_ADC, "muic-ADC" }, 68 { MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" }, 69 { MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" }, 70 { MAX77836_IRQ_INT1_ADC1K, "muic-ADC1K" }, 71 { MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" }, 72 { MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" }, 73 { MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" }, 74 { MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" }, 75 { MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" }, 76 { MAX77836_IRQ_INT2_VIDRM, "muic-VIDRM" }, 77 }; 78 79 struct max14577_muic_info { 80 struct device *dev; 81 struct max14577 *max14577; 82 struct extcon_dev *edev; 83 int prev_cable_type; 84 int prev_chg_type; 85 u8 status[MAX14577_MUIC_STATUS_END]; 86 87 struct max14577_muic_irq *muic_irqs; 88 unsigned int muic_irqs_num; 89 bool irq_adc; 90 bool irq_chg; 91 struct work_struct irq_work; 92 struct mutex mutex; 93 94 /* 95 * Use delayed workqueue to detect cable state and then 96 * notify cable state to notifiee/platform through uevent. 97 * After completing the booting of platform, the extcon provider 98 * driver should notify cable state to upper layer. 99 */ 100 struct delayed_work wq_detcable; 101 102 /* 103 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB 104 * h/w path of COMP2/COMN1 on CONTROL1 register. 105 */ 106 int path_usb; 107 int path_uart; 108 }; 109 110 enum max14577_muic_cable_group { 111 MAX14577_CABLE_GROUP_ADC = 0, 112 MAX14577_CABLE_GROUP_CHG, 113 }; 114 115 /* Define supported accessory type */ 116 enum max14577_muic_acc_type { 117 MAX14577_MUIC_ADC_GROUND = 0x0, 118 MAX14577_MUIC_ADC_SEND_END_BUTTON, 119 MAX14577_MUIC_ADC_REMOTE_S1_BUTTON, 120 MAX14577_MUIC_ADC_REMOTE_S2_BUTTON, 121 MAX14577_MUIC_ADC_REMOTE_S3_BUTTON, 122 MAX14577_MUIC_ADC_REMOTE_S4_BUTTON, 123 MAX14577_MUIC_ADC_REMOTE_S5_BUTTON, 124 MAX14577_MUIC_ADC_REMOTE_S6_BUTTON, 125 MAX14577_MUIC_ADC_REMOTE_S7_BUTTON, 126 MAX14577_MUIC_ADC_REMOTE_S8_BUTTON, 127 MAX14577_MUIC_ADC_REMOTE_S9_BUTTON, 128 MAX14577_MUIC_ADC_REMOTE_S10_BUTTON, 129 MAX14577_MUIC_ADC_REMOTE_S11_BUTTON, 130 MAX14577_MUIC_ADC_REMOTE_S12_BUTTON, 131 MAX14577_MUIC_ADC_RESERVED_ACC_1, 132 MAX14577_MUIC_ADC_RESERVED_ACC_2, 133 MAX14577_MUIC_ADC_RESERVED_ACC_3, 134 MAX14577_MUIC_ADC_RESERVED_ACC_4, 135 MAX14577_MUIC_ADC_RESERVED_ACC_5, 136 MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2, 137 MAX14577_MUIC_ADC_PHONE_POWERED_DEV, 138 MAX14577_MUIC_ADC_TTY_CONVERTER, 139 MAX14577_MUIC_ADC_UART_CABLE, 140 MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG, 141 MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF, 142 MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON, 143 MAX14577_MUIC_ADC_AV_CABLE_NOLOAD, 144 MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG, 145 MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF, 146 MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON, 147 MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */ 148 MAX14577_MUIC_ADC_OPEN, 149 }; 150 151 static const unsigned int max14577_extcon_cable[] = { 152 EXTCON_USB, 153 EXTCON_CHG_USB_DCP, 154 EXTCON_CHG_USB_FAST, 155 EXTCON_CHG_USB_SLOW, 156 EXTCON_CHG_USB_CDP, 157 EXTCON_JIG, 158 EXTCON_NONE, 159 }; 160 161 /* 162 * max14577_muic_set_debounce_time - Set the debounce time of ADC 163 * @info: the instance including private data of max14577 MUIC 164 * @time: the debounce time of ADC 165 */ 166 static int max14577_muic_set_debounce_time(struct max14577_muic_info *info, 167 enum max14577_muic_adc_debounce_time time) 168 { 169 u8 ret; 170 171 switch (time) { 172 case ADC_DEBOUNCE_TIME_5MS: 173 case ADC_DEBOUNCE_TIME_10MS: 174 case ADC_DEBOUNCE_TIME_25MS: 175 case ADC_DEBOUNCE_TIME_38_62MS: 176 ret = max14577_update_reg(info->max14577->regmap, 177 MAX14577_MUIC_REG_CONTROL3, 178 CTRL3_ADCDBSET_MASK, 179 time << CTRL3_ADCDBSET_SHIFT); 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 * max14577_muic_set_path - Set hardware line according to attached cable 195 * @info: the instance including private data of max14577 MUIC 196 * @value: the path according to attached cable 197 * @attached: the state of cable (true:attached, false:detached) 198 * 199 * The max14577 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 max14577_muic_set_path(struct max14577_muic_info *info, 204 u8 val, bool attached) 205 { 206 int ret = 0; 207 u8 ctrl1, ctrl2 = 0; 208 209 /* Set open state to path before changing hw path */ 210 ret = max14577_update_reg(info->max14577->regmap, 211 MAX14577_MUIC_REG_CONTROL1, 212 CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN); 213 if (ret < 0) { 214 dev_err(info->dev, "failed to update MUIC register\n"); 215 return ret; 216 } 217 218 if (attached) 219 ctrl1 = val; 220 else 221 ctrl1 = CTRL1_SW_OPEN; 222 223 ret = max14577_update_reg(info->max14577->regmap, 224 MAX14577_MUIC_REG_CONTROL1, 225 CLEAR_IDBEN_MICEN_MASK, ctrl1); 226 if (ret < 0) { 227 dev_err(info->dev, "failed to update MUIC register\n"); 228 return ret; 229 } 230 231 if (attached) 232 ctrl2 |= CTRL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */ 233 else 234 ctrl2 |= CTRL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */ 235 236 ret = max14577_update_reg(info->max14577->regmap, 237 MAX14577_REG_CONTROL2, 238 CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2); 239 if (ret < 0) { 240 dev_err(info->dev, "failed to update MUIC register\n"); 241 return ret; 242 } 243 244 dev_dbg(info->dev, 245 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n", 246 ctrl1, ctrl2, attached ? "attached" : "detached"); 247 248 return 0; 249 } 250 251 /* 252 * max14577_muic_get_cable_type - Return cable type and check cable state 253 * @info: the instance including private data of max14577 MUIC 254 * @group: the path according to attached cable 255 * @attached: store cable state and return 256 * 257 * This function check the cable state either attached or detached, 258 * and then divide precise type of cable according to cable group. 259 * - max14577_CABLE_GROUP_ADC 260 * - max14577_CABLE_GROUP_CHG 261 */ 262 static int max14577_muic_get_cable_type(struct max14577_muic_info *info, 263 enum max14577_muic_cable_group group, bool *attached) 264 { 265 int cable_type = 0; 266 int adc; 267 int chg_type; 268 269 switch (group) { 270 case MAX14577_CABLE_GROUP_ADC: 271 /* 272 * Read ADC value to check cable type and decide cable state 273 * according to cable type 274 */ 275 adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK; 276 adc >>= STATUS1_ADC_SHIFT; 277 278 /* 279 * Check current cable state/cable type and store cable type 280 * (info->prev_cable_type) for handling cable when cable is 281 * detached. 282 */ 283 if (adc == MAX14577_MUIC_ADC_OPEN) { 284 *attached = false; 285 286 cable_type = info->prev_cable_type; 287 info->prev_cable_type = MAX14577_MUIC_ADC_OPEN; 288 } else { 289 *attached = true; 290 291 cable_type = info->prev_cable_type = adc; 292 } 293 break; 294 case MAX14577_CABLE_GROUP_CHG: 295 /* 296 * Read charger type to check cable type and decide cable state 297 * according to type of charger cable. 298 */ 299 chg_type = info->status[MAX14577_MUIC_STATUS2] & 300 STATUS2_CHGTYP_MASK; 301 chg_type >>= STATUS2_CHGTYP_SHIFT; 302 303 if (chg_type == MAX14577_CHARGER_TYPE_NONE) { 304 *attached = false; 305 306 cable_type = info->prev_chg_type; 307 info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE; 308 } else { 309 *attached = true; 310 311 /* 312 * Check current cable state/cable type and store cable 313 * type(info->prev_chg_type) for handling cable when 314 * charger cable is detached. 315 */ 316 cable_type = info->prev_chg_type = chg_type; 317 } 318 319 break; 320 default: 321 dev_err(info->dev, "Unknown cable group (%d)\n", group); 322 cable_type = -EINVAL; 323 break; 324 } 325 326 return cable_type; 327 } 328 329 static int max14577_muic_jig_handler(struct max14577_muic_info *info, 330 int cable_type, bool attached) 331 { 332 int ret = 0; 333 u8 path = CTRL1_SW_OPEN; 334 335 dev_dbg(info->dev, 336 "external connector is %s (adc:0x%02x)\n", 337 attached ? "attached" : "detached", cable_type); 338 339 switch (cable_type) { 340 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: /* ADC_JIG_USB_OFF */ 341 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: /* ADC_JIG_USB_ON */ 342 /* PATH:AP_USB */ 343 path = CTRL1_SW_USB; 344 break; 345 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: /* ADC_JIG_UART_OFF */ 346 /* PATH:AP_UART */ 347 path = CTRL1_SW_UART; 348 break; 349 default: 350 dev_err(info->dev, "failed to detect %s jig cable\n", 351 attached ? "attached" : "detached"); 352 return -EINVAL; 353 } 354 355 ret = max14577_muic_set_path(info, path, attached); 356 if (ret < 0) 357 return ret; 358 359 extcon_set_cable_state_(info->edev, EXTCON_JIG, attached); 360 361 return 0; 362 } 363 364 static int max14577_muic_adc_handler(struct max14577_muic_info *info) 365 { 366 int cable_type; 367 bool attached; 368 int ret = 0; 369 370 /* Check accessory state which is either detached or attached */ 371 cable_type = max14577_muic_get_cable_type(info, 372 MAX14577_CABLE_GROUP_ADC, &attached); 373 374 dev_dbg(info->dev, 375 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n", 376 attached ? "attached" : "detached", cable_type, 377 info->prev_cable_type); 378 379 switch (cable_type) { 380 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: 381 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: 382 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: 383 /* JIG */ 384 ret = max14577_muic_jig_handler(info, cable_type, attached); 385 if (ret < 0) 386 return ret; 387 break; 388 case MAX14577_MUIC_ADC_GROUND: 389 case MAX14577_MUIC_ADC_SEND_END_BUTTON: 390 case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON: 391 case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON: 392 case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON: 393 case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON: 394 case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON: 395 case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON: 396 case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON: 397 case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON: 398 case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON: 399 case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON: 400 case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON: 401 case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON: 402 case MAX14577_MUIC_ADC_RESERVED_ACC_1: 403 case MAX14577_MUIC_ADC_RESERVED_ACC_2: 404 case MAX14577_MUIC_ADC_RESERVED_ACC_3: 405 case MAX14577_MUIC_ADC_RESERVED_ACC_4: 406 case MAX14577_MUIC_ADC_RESERVED_ACC_5: 407 case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2: 408 case MAX14577_MUIC_ADC_PHONE_POWERED_DEV: 409 case MAX14577_MUIC_ADC_TTY_CONVERTER: 410 case MAX14577_MUIC_ADC_UART_CABLE: 411 case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG: 412 case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD: 413 case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG: 414 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON: 415 case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1: 416 /* 417 * This accessory isn't used in general case if it is specially 418 * needed to detect additional accessory, should implement 419 * proper operation when this accessory is attached/detached. 420 */ 421 dev_info(info->dev, 422 "accessory is %s but it isn't used (adc:0x%x)\n", 423 attached ? "attached" : "detached", cable_type); 424 return -EAGAIN; 425 default: 426 dev_err(info->dev, 427 "failed to detect %s accessory (adc:0x%x)\n", 428 attached ? "attached" : "detached", cable_type); 429 return -EINVAL; 430 } 431 432 return 0; 433 } 434 435 static int max14577_muic_chg_handler(struct max14577_muic_info *info) 436 { 437 int chg_type; 438 bool attached; 439 int ret = 0; 440 441 chg_type = max14577_muic_get_cable_type(info, 442 MAX14577_CABLE_GROUP_CHG, &attached); 443 444 dev_dbg(info->dev, 445 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n", 446 attached ? "attached" : "detached", 447 chg_type, info->prev_chg_type); 448 449 switch (chg_type) { 450 case MAX14577_CHARGER_TYPE_USB: 451 /* PATH:AP_USB */ 452 ret = max14577_muic_set_path(info, info->path_usb, attached); 453 if (ret < 0) 454 return ret; 455 456 extcon_set_cable_state_(info->edev, EXTCON_USB, attached); 457 break; 458 case MAX14577_CHARGER_TYPE_DEDICATED_CHG: 459 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_DCP, 460 attached); 461 break; 462 case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT: 463 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_CDP, 464 attached); 465 break; 466 case MAX14577_CHARGER_TYPE_SPECIAL_500MA: 467 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_SLOW, 468 attached); 469 break; 470 case MAX14577_CHARGER_TYPE_SPECIAL_1A: 471 extcon_set_cable_state_(info->edev, EXTCON_CHG_USB_FAST, 472 attached); 473 break; 474 case MAX14577_CHARGER_TYPE_NONE: 475 case MAX14577_CHARGER_TYPE_DEAD_BATTERY: 476 break; 477 default: 478 dev_err(info->dev, 479 "failed to detect %s accessory (chg_type:0x%x)\n", 480 attached ? "attached" : "detached", chg_type); 481 return -EINVAL; 482 } 483 484 return 0; 485 } 486 487 static void max14577_muic_irq_work(struct work_struct *work) 488 { 489 struct max14577_muic_info *info = container_of(work, 490 struct max14577_muic_info, irq_work); 491 int ret = 0; 492 493 if (!info->edev) 494 return; 495 496 mutex_lock(&info->mutex); 497 498 ret = max14577_bulk_read(info->max14577->regmap, 499 MAX14577_MUIC_REG_STATUS1, info->status, 2); 500 if (ret) { 501 dev_err(info->dev, "failed to read MUIC register\n"); 502 mutex_unlock(&info->mutex); 503 return; 504 } 505 506 if (info->irq_adc) { 507 ret = max14577_muic_adc_handler(info); 508 info->irq_adc = false; 509 } 510 if (info->irq_chg) { 511 ret = max14577_muic_chg_handler(info); 512 info->irq_chg = false; 513 } 514 515 if (ret < 0) 516 dev_err(info->dev, "failed to handle MUIC interrupt\n"); 517 518 mutex_unlock(&info->mutex); 519 } 520 521 /* 522 * Sets irq_adc or irq_chg in max14577_muic_info and returns 1. 523 * Returns 0 if irq_type does not match registered IRQ for this device type. 524 */ 525 static int max14577_parse_irq(struct max14577_muic_info *info, int irq_type) 526 { 527 switch (irq_type) { 528 case MAX14577_IRQ_INT1_ADC: 529 case MAX14577_IRQ_INT1_ADCLOW: 530 case MAX14577_IRQ_INT1_ADCERR: 531 /* Handle all of accessory except for 532 type of charger accessory */ 533 info->irq_adc = true; 534 return 1; 535 case MAX14577_IRQ_INT2_CHGTYP: 536 case MAX14577_IRQ_INT2_CHGDETRUN: 537 case MAX14577_IRQ_INT2_DCDTMR: 538 case MAX14577_IRQ_INT2_DBCHG: 539 case MAX14577_IRQ_INT2_VBVOLT: 540 /* Handle charger accessory */ 541 info->irq_chg = true; 542 return 1; 543 default: 544 return 0; 545 } 546 } 547 548 /* 549 * Sets irq_adc or irq_chg in max14577_muic_info and returns 1. 550 * Returns 0 if irq_type does not match registered IRQ for this device type. 551 */ 552 static int max77836_parse_irq(struct max14577_muic_info *info, int irq_type) 553 { 554 /* First check common max14577 interrupts */ 555 if (max14577_parse_irq(info, irq_type)) 556 return 1; 557 558 switch (irq_type) { 559 case MAX77836_IRQ_INT1_ADC1K: 560 info->irq_adc = true; 561 return 1; 562 case MAX77836_IRQ_INT2_VIDRM: 563 /* Handle charger accessory */ 564 info->irq_chg = true; 565 return 1; 566 default: 567 return 0; 568 } 569 } 570 571 static irqreturn_t max14577_muic_irq_handler(int irq, void *data) 572 { 573 struct max14577_muic_info *info = data; 574 int i, irq_type = -1; 575 bool irq_parsed; 576 577 /* 578 * We may be called multiple times for different nested IRQ-s. 579 * Including changes in INT1_ADC and INT2_CGHTYP at once. 580 * However we only need to know whether it was ADC, charger 581 * or both interrupts so decode IRQ and turn on proper flags. 582 */ 583 for (i = 0; i < info->muic_irqs_num; i++) 584 if (irq == info->muic_irqs[i].virq) 585 irq_type = info->muic_irqs[i].irq; 586 587 switch (info->max14577->dev_type) { 588 case MAXIM_DEVICE_TYPE_MAX77836: 589 irq_parsed = max77836_parse_irq(info, irq_type); 590 break; 591 case MAXIM_DEVICE_TYPE_MAX14577: 592 default: 593 irq_parsed = max14577_parse_irq(info, irq_type); 594 break; 595 } 596 597 if (!irq_parsed) { 598 dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n", 599 irq_type); 600 return IRQ_HANDLED; 601 } 602 schedule_work(&info->irq_work); 603 604 return IRQ_HANDLED; 605 } 606 607 static int max14577_muic_detect_accessory(struct max14577_muic_info *info) 608 { 609 int ret = 0; 610 int adc; 611 int chg_type; 612 bool attached; 613 614 mutex_lock(&info->mutex); 615 616 /* Read STATUSx register to detect accessory */ 617 ret = max14577_bulk_read(info->max14577->regmap, 618 MAX14577_MUIC_REG_STATUS1, info->status, 2); 619 if (ret) { 620 dev_err(info->dev, "failed to read MUIC register\n"); 621 mutex_unlock(&info->mutex); 622 return ret; 623 } 624 625 adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC, 626 &attached); 627 if (attached && adc != MAX14577_MUIC_ADC_OPEN) { 628 ret = max14577_muic_adc_handler(info); 629 if (ret < 0) { 630 dev_err(info->dev, "Cannot detect accessory\n"); 631 mutex_unlock(&info->mutex); 632 return ret; 633 } 634 } 635 636 chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG, 637 &attached); 638 if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) { 639 ret = max14577_muic_chg_handler(info); 640 if (ret < 0) { 641 dev_err(info->dev, "Cannot detect charger accessory\n"); 642 mutex_unlock(&info->mutex); 643 return ret; 644 } 645 } 646 647 mutex_unlock(&info->mutex); 648 649 return 0; 650 } 651 652 static void max14577_muic_detect_cable_wq(struct work_struct *work) 653 { 654 struct max14577_muic_info *info = container_of(to_delayed_work(work), 655 struct max14577_muic_info, wq_detcable); 656 657 max14577_muic_detect_accessory(info); 658 } 659 660 static int max14577_muic_probe(struct platform_device *pdev) 661 { 662 struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); 663 struct max14577_muic_info *info; 664 int delay_jiffies; 665 int ret; 666 int i; 667 u8 id; 668 669 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 670 if (!info) 671 return -ENOMEM; 672 673 info->dev = &pdev->dev; 674 info->max14577 = max14577; 675 676 platform_set_drvdata(pdev, info); 677 mutex_init(&info->mutex); 678 679 INIT_WORK(&info->irq_work, max14577_muic_irq_work); 680 681 switch (max14577->dev_type) { 682 case MAXIM_DEVICE_TYPE_MAX77836: 683 info->muic_irqs = max77836_muic_irqs; 684 info->muic_irqs_num = ARRAY_SIZE(max77836_muic_irqs); 685 break; 686 case MAXIM_DEVICE_TYPE_MAX14577: 687 default: 688 info->muic_irqs = max14577_muic_irqs; 689 info->muic_irqs_num = ARRAY_SIZE(max14577_muic_irqs); 690 } 691 692 /* Support irq domain for max14577 MUIC device */ 693 for (i = 0; i < info->muic_irqs_num; i++) { 694 struct max14577_muic_irq *muic_irq = &info->muic_irqs[i]; 695 unsigned int virq = 0; 696 697 virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq); 698 if (virq <= 0) 699 return -EINVAL; 700 muic_irq->virq = virq; 701 702 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL, 703 max14577_muic_irq_handler, 704 IRQF_NO_SUSPEND, 705 muic_irq->name, info); 706 if (ret) { 707 dev_err(&pdev->dev, 708 "failed: irq request (IRQ: %d, error :%d)\n", 709 muic_irq->irq, ret); 710 return ret; 711 } 712 } 713 714 /* Initialize extcon device */ 715 info->edev = devm_extcon_dev_allocate(&pdev->dev, 716 max14577_extcon_cable); 717 if (IS_ERR(info->edev)) { 718 dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); 719 return -ENOMEM; 720 } 721 722 ret = devm_extcon_dev_register(&pdev->dev, info->edev); 723 if (ret) { 724 dev_err(&pdev->dev, "failed to register extcon device\n"); 725 return ret; 726 } 727 728 /* Default h/w line path */ 729 info->path_usb = CTRL1_SW_USB; 730 info->path_uart = CTRL1_SW_UART; 731 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); 732 733 /* Set initial path for UART */ 734 max14577_muic_set_path(info, info->path_uart, true); 735 736 /* Check revision number of MUIC device*/ 737 ret = max14577_read_reg(info->max14577->regmap, 738 MAX14577_REG_DEVICEID, &id); 739 if (ret < 0) { 740 dev_err(&pdev->dev, "failed to read revision number\n"); 741 return ret; 742 } 743 dev_info(info->dev, "device ID : 0x%x\n", id); 744 745 /* Set ADC debounce time */ 746 max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS); 747 748 /* 749 * Detect accessory after completing the initialization of platform 750 * 751 * - Use delayed workqueue to detect cable state and then 752 * notify cable state to notifiee/platform through uevent. 753 * After completing the booting of platform, the extcon provider 754 * driver should notify cable state to upper layer. 755 */ 756 INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq); 757 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable, 758 delay_jiffies); 759 760 return ret; 761 } 762 763 static int max14577_muic_remove(struct platform_device *pdev) 764 { 765 struct max14577_muic_info *info = platform_get_drvdata(pdev); 766 767 cancel_work_sync(&info->irq_work); 768 769 return 0; 770 } 771 772 static const struct platform_device_id max14577_muic_id[] = { 773 { "max14577-muic", MAXIM_DEVICE_TYPE_MAX14577, }, 774 { "max77836-muic", MAXIM_DEVICE_TYPE_MAX77836, }, 775 { } 776 }; 777 MODULE_DEVICE_TABLE(platform, max14577_muic_id); 778 779 static struct platform_driver max14577_muic_driver = { 780 .driver = { 781 .name = "max14577-muic", 782 }, 783 .probe = max14577_muic_probe, 784 .remove = max14577_muic_remove, 785 .id_table = max14577_muic_id, 786 }; 787 788 module_platform_driver(max14577_muic_driver); 789 790 MODULE_DESCRIPTION("Maxim 14577/77836 Extcon driver"); 791 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <k.kozlowski@samsung.com>"); 792 MODULE_LICENSE("GPL"); 793 MODULE_ALIAS("platform:extcon-max14577"); 794