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 enum extcon max14577_extcon_cable[] = { 152 EXTCON_USB, 153 EXTCON_TA, 154 EXTCON_FAST_CHARGER, 155 EXTCON_SLOW_CHARGER, 156 EXTCON_CHARGE_DOWNSTREAM, 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_TA, attached); 460 break; 461 case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT: 462 extcon_set_cable_state_(info->edev, EXTCON_CHARGE_DOWNSTREAM, 463 attached); 464 break; 465 case MAX14577_CHARGER_TYPE_SPECIAL_500MA: 466 extcon_set_cable_state_(info->edev, EXTCON_SLOW_CHARGER, 467 attached); 468 break; 469 case MAX14577_CHARGER_TYPE_SPECIAL_1A: 470 extcon_set_cable_state_(info->edev, EXTCON_FAST_CHARGER, 471 attached); 472 break; 473 case MAX14577_CHARGER_TYPE_NONE: 474 case MAX14577_CHARGER_TYPE_DEAD_BATTERY: 475 break; 476 default: 477 dev_err(info->dev, 478 "failed to detect %s accessory (chg_type:0x%x)\n", 479 attached ? "attached" : "detached", chg_type); 480 return -EINVAL; 481 } 482 483 return 0; 484 } 485 486 static void max14577_muic_irq_work(struct work_struct *work) 487 { 488 struct max14577_muic_info *info = container_of(work, 489 struct max14577_muic_info, irq_work); 490 int ret = 0; 491 492 if (!info->edev) 493 return; 494 495 mutex_lock(&info->mutex); 496 497 ret = max14577_bulk_read(info->max14577->regmap, 498 MAX14577_MUIC_REG_STATUS1, info->status, 2); 499 if (ret) { 500 dev_err(info->dev, "failed to read MUIC register\n"); 501 mutex_unlock(&info->mutex); 502 return; 503 } 504 505 if (info->irq_adc) { 506 ret = max14577_muic_adc_handler(info); 507 info->irq_adc = false; 508 } 509 if (info->irq_chg) { 510 ret = max14577_muic_chg_handler(info); 511 info->irq_chg = false; 512 } 513 514 if (ret < 0) 515 dev_err(info->dev, "failed to handle MUIC interrupt\n"); 516 517 mutex_unlock(&info->mutex); 518 } 519 520 /* 521 * Sets irq_adc or irq_chg in max14577_muic_info and returns 1. 522 * Returns 0 if irq_type does not match registered IRQ for this device type. 523 */ 524 static int max14577_parse_irq(struct max14577_muic_info *info, int irq_type) 525 { 526 switch (irq_type) { 527 case MAX14577_IRQ_INT1_ADC: 528 case MAX14577_IRQ_INT1_ADCLOW: 529 case MAX14577_IRQ_INT1_ADCERR: 530 /* Handle all of accessory except for 531 type of charger accessory */ 532 info->irq_adc = true; 533 return 1; 534 case MAX14577_IRQ_INT2_CHGTYP: 535 case MAX14577_IRQ_INT2_CHGDETRUN: 536 case MAX14577_IRQ_INT2_DCDTMR: 537 case MAX14577_IRQ_INT2_DBCHG: 538 case MAX14577_IRQ_INT2_VBVOLT: 539 /* Handle charger accessory */ 540 info->irq_chg = true; 541 return 1; 542 default: 543 return 0; 544 } 545 } 546 547 /* 548 * Sets irq_adc or irq_chg in max14577_muic_info and returns 1. 549 * Returns 0 if irq_type does not match registered IRQ for this device type. 550 */ 551 static int max77836_parse_irq(struct max14577_muic_info *info, int irq_type) 552 { 553 /* First check common max14577 interrupts */ 554 if (max14577_parse_irq(info, irq_type)) 555 return 1; 556 557 switch (irq_type) { 558 case MAX77836_IRQ_INT1_ADC1K: 559 info->irq_adc = true; 560 return 1; 561 case MAX77836_IRQ_INT2_VIDRM: 562 /* Handle charger accessory */ 563 info->irq_chg = true; 564 return 1; 565 default: 566 return 0; 567 } 568 } 569 570 static irqreturn_t max14577_muic_irq_handler(int irq, void *data) 571 { 572 struct max14577_muic_info *info = data; 573 int i, irq_type = -1; 574 bool irq_parsed; 575 576 /* 577 * We may be called multiple times for different nested IRQ-s. 578 * Including changes in INT1_ADC and INT2_CGHTYP at once. 579 * However we only need to know whether it was ADC, charger 580 * or both interrupts so decode IRQ and turn on proper flags. 581 */ 582 for (i = 0; i < info->muic_irqs_num; i++) 583 if (irq == info->muic_irqs[i].virq) 584 irq_type = info->muic_irqs[i].irq; 585 586 switch (info->max14577->dev_type) { 587 case MAXIM_DEVICE_TYPE_MAX77836: 588 irq_parsed = max77836_parse_irq(info, irq_type); 589 break; 590 case MAXIM_DEVICE_TYPE_MAX14577: 591 default: 592 irq_parsed = max14577_parse_irq(info, irq_type); 593 break; 594 } 595 596 if (!irq_parsed) { 597 dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n", 598 irq_type); 599 return IRQ_HANDLED; 600 } 601 schedule_work(&info->irq_work); 602 603 return IRQ_HANDLED; 604 } 605 606 static int max14577_muic_detect_accessory(struct max14577_muic_info *info) 607 { 608 int ret = 0; 609 int adc; 610 int chg_type; 611 bool attached; 612 613 mutex_lock(&info->mutex); 614 615 /* Read STATUSx register to detect accessory */ 616 ret = max14577_bulk_read(info->max14577->regmap, 617 MAX14577_MUIC_REG_STATUS1, info->status, 2); 618 if (ret) { 619 dev_err(info->dev, "failed to read MUIC register\n"); 620 mutex_unlock(&info->mutex); 621 return ret; 622 } 623 624 adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC, 625 &attached); 626 if (attached && adc != MAX14577_MUIC_ADC_OPEN) { 627 ret = max14577_muic_adc_handler(info); 628 if (ret < 0) { 629 dev_err(info->dev, "Cannot detect accessory\n"); 630 mutex_unlock(&info->mutex); 631 return ret; 632 } 633 } 634 635 chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG, 636 &attached); 637 if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) { 638 ret = max14577_muic_chg_handler(info); 639 if (ret < 0) { 640 dev_err(info->dev, "Cannot detect charger accessory\n"); 641 mutex_unlock(&info->mutex); 642 return ret; 643 } 644 } 645 646 mutex_unlock(&info->mutex); 647 648 return 0; 649 } 650 651 static void max14577_muic_detect_cable_wq(struct work_struct *work) 652 { 653 struct max14577_muic_info *info = container_of(to_delayed_work(work), 654 struct max14577_muic_info, wq_detcable); 655 656 max14577_muic_detect_accessory(info); 657 } 658 659 static int max14577_muic_probe(struct platform_device *pdev) 660 { 661 struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); 662 struct max14577_muic_info *info; 663 int delay_jiffies; 664 int ret; 665 int i; 666 u8 id; 667 668 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 669 if (!info) 670 return -ENOMEM; 671 672 info->dev = &pdev->dev; 673 info->max14577 = max14577; 674 675 platform_set_drvdata(pdev, info); 676 mutex_init(&info->mutex); 677 678 INIT_WORK(&info->irq_work, max14577_muic_irq_work); 679 680 switch (max14577->dev_type) { 681 case MAXIM_DEVICE_TYPE_MAX77836: 682 info->muic_irqs = max77836_muic_irqs; 683 info->muic_irqs_num = ARRAY_SIZE(max77836_muic_irqs); 684 break; 685 case MAXIM_DEVICE_TYPE_MAX14577: 686 default: 687 info->muic_irqs = max14577_muic_irqs; 688 info->muic_irqs_num = ARRAY_SIZE(max14577_muic_irqs); 689 } 690 691 /* Support irq domain for max14577 MUIC device */ 692 for (i = 0; i < info->muic_irqs_num; i++) { 693 struct max14577_muic_irq *muic_irq = &info->muic_irqs[i]; 694 unsigned int virq = 0; 695 696 virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq); 697 if (virq <= 0) 698 return -EINVAL; 699 muic_irq->virq = virq; 700 701 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL, 702 max14577_muic_irq_handler, 703 IRQF_NO_SUSPEND, 704 muic_irq->name, info); 705 if (ret) { 706 dev_err(&pdev->dev, 707 "failed: irq request (IRQ: %d, error :%d)\n", 708 muic_irq->irq, ret); 709 return ret; 710 } 711 } 712 713 /* Initialize extcon device */ 714 info->edev = devm_extcon_dev_allocate(&pdev->dev, 715 max14577_extcon_cable); 716 if (IS_ERR(info->edev)) { 717 dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); 718 return -ENOMEM; 719 } 720 721 ret = devm_extcon_dev_register(&pdev->dev, info->edev); 722 if (ret) { 723 dev_err(&pdev->dev, "failed to register extcon device\n"); 724 return ret; 725 } 726 727 /* Default h/w line path */ 728 info->path_usb = CTRL1_SW_USB; 729 info->path_uart = CTRL1_SW_UART; 730 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); 731 732 /* Set initial path for UART */ 733 max14577_muic_set_path(info, info->path_uart, true); 734 735 /* Check revision number of MUIC device*/ 736 ret = max14577_read_reg(info->max14577->regmap, 737 MAX14577_REG_DEVICEID, &id); 738 if (ret < 0) { 739 dev_err(&pdev->dev, "failed to read revision number\n"); 740 return ret; 741 } 742 dev_info(info->dev, "device ID : 0x%x\n", id); 743 744 /* Set ADC debounce time */ 745 max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS); 746 747 /* 748 * Detect accessory after completing the initialization of platform 749 * 750 * - Use delayed workqueue to detect cable state and then 751 * notify cable state to notifiee/platform through uevent. 752 * After completing the booting of platform, the extcon provider 753 * driver should notify cable state to upper layer. 754 */ 755 INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq); 756 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable, 757 delay_jiffies); 758 759 return ret; 760 } 761 762 static int max14577_muic_remove(struct platform_device *pdev) 763 { 764 struct max14577_muic_info *info = platform_get_drvdata(pdev); 765 766 cancel_work_sync(&info->irq_work); 767 768 return 0; 769 } 770 771 static const struct platform_device_id max14577_muic_id[] = { 772 { "max14577-muic", MAXIM_DEVICE_TYPE_MAX14577, }, 773 { "max77836-muic", MAXIM_DEVICE_TYPE_MAX77836, }, 774 { } 775 }; 776 MODULE_DEVICE_TABLE(platform, max14577_muic_id); 777 778 static struct platform_driver max14577_muic_driver = { 779 .driver = { 780 .name = "max14577-muic", 781 }, 782 .probe = max14577_muic_probe, 783 .remove = max14577_muic_remove, 784 .id_table = max14577_muic_id, 785 }; 786 787 module_platform_driver(max14577_muic_driver); 788 789 MODULE_DESCRIPTION("Maxim 14577/77836 Extcon driver"); 790 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <k.kozlowski@samsung.com>"); 791 MODULE_LICENSE("GPL"); 792 MODULE_ALIAS("platform:extcon-max14577"); 793