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 <krzk@kernel.org> 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-provider.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_SDP, 154 EXTCON_CHG_USB_DCP, 155 EXTCON_CHG_USB_FAST, 156 EXTCON_CHG_USB_SLOW, 157 EXTCON_CHG_USB_CDP, 158 EXTCON_JIG, 159 EXTCON_NONE, 160 }; 161 162 /* 163 * max14577_muic_set_debounce_time - Set the debounce time of ADC 164 * @info: the instance including private data of max14577 MUIC 165 * @time: the debounce time of ADC 166 */ 167 static int max14577_muic_set_debounce_time(struct max14577_muic_info *info, 168 enum max14577_muic_adc_debounce_time time) 169 { 170 u8 ret; 171 172 switch (time) { 173 case ADC_DEBOUNCE_TIME_5MS: 174 case ADC_DEBOUNCE_TIME_10MS: 175 case ADC_DEBOUNCE_TIME_25MS: 176 case ADC_DEBOUNCE_TIME_38_62MS: 177 ret = max14577_update_reg(info->max14577->regmap, 178 MAX14577_MUIC_REG_CONTROL3, 179 CTRL3_ADCDBSET_MASK, 180 time << CTRL3_ADCDBSET_SHIFT); 181 if (ret) { 182 dev_err(info->dev, "failed to set ADC debounce time\n"); 183 return ret; 184 } 185 break; 186 default: 187 dev_err(info->dev, "invalid ADC debounce time\n"); 188 return -EINVAL; 189 } 190 191 return 0; 192 }; 193 194 /* 195 * max14577_muic_set_path - Set hardware line according to attached cable 196 * @info: the instance including private data of max14577 MUIC 197 * @value: the path according to attached cable 198 * @attached: the state of cable (true:attached, false:detached) 199 * 200 * The max14577 MUIC device share outside H/W line among a varity of cables 201 * so, this function set internal path of H/W line according to the type of 202 * attached cable. 203 */ 204 static int max14577_muic_set_path(struct max14577_muic_info *info, 205 u8 val, bool attached) 206 { 207 u8 ctrl1, ctrl2 = 0; 208 int ret; 209 210 /* Set open state to path before changing hw path */ 211 ret = max14577_update_reg(info->max14577->regmap, 212 MAX14577_MUIC_REG_CONTROL1, 213 CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN); 214 if (ret < 0) { 215 dev_err(info->dev, "failed to update MUIC register\n"); 216 return ret; 217 } 218 219 if (attached) 220 ctrl1 = val; 221 else 222 ctrl1 = CTRL1_SW_OPEN; 223 224 ret = max14577_update_reg(info->max14577->regmap, 225 MAX14577_MUIC_REG_CONTROL1, 226 CLEAR_IDBEN_MICEN_MASK, ctrl1); 227 if (ret < 0) { 228 dev_err(info->dev, "failed to update MUIC register\n"); 229 return ret; 230 } 231 232 if (attached) 233 ctrl2 |= CTRL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */ 234 else 235 ctrl2 |= CTRL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */ 236 237 ret = max14577_update_reg(info->max14577->regmap, 238 MAX14577_REG_CONTROL2, 239 CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2); 240 if (ret < 0) { 241 dev_err(info->dev, "failed to update MUIC register\n"); 242 return ret; 243 } 244 245 dev_dbg(info->dev, 246 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n", 247 ctrl1, ctrl2, attached ? "attached" : "detached"); 248 249 return 0; 250 } 251 252 /* 253 * max14577_muic_get_cable_type - Return cable type and check cable state 254 * @info: the instance including private data of max14577 MUIC 255 * @group: the path according to attached cable 256 * @attached: store cable state and return 257 * 258 * This function check the cable state either attached or detached, 259 * and then divide precise type of cable according to cable group. 260 * - max14577_CABLE_GROUP_ADC 261 * - max14577_CABLE_GROUP_CHG 262 */ 263 static int max14577_muic_get_cable_type(struct max14577_muic_info *info, 264 enum max14577_muic_cable_group group, bool *attached) 265 { 266 int cable_type = 0; 267 int adc; 268 int chg_type; 269 270 switch (group) { 271 case MAX14577_CABLE_GROUP_ADC: 272 /* 273 * Read ADC value to check cable type and decide cable state 274 * according to cable type 275 */ 276 adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK; 277 adc >>= STATUS1_ADC_SHIFT; 278 279 /* 280 * Check current cable state/cable type and store cable type 281 * (info->prev_cable_type) for handling cable when cable is 282 * detached. 283 */ 284 if (adc == MAX14577_MUIC_ADC_OPEN) { 285 *attached = false; 286 287 cable_type = info->prev_cable_type; 288 info->prev_cable_type = MAX14577_MUIC_ADC_OPEN; 289 } else { 290 *attached = true; 291 292 cable_type = info->prev_cable_type = adc; 293 } 294 break; 295 case MAX14577_CABLE_GROUP_CHG: 296 /* 297 * Read charger type to check cable type and decide cable state 298 * according to type of charger cable. 299 */ 300 chg_type = info->status[MAX14577_MUIC_STATUS2] & 301 STATUS2_CHGTYP_MASK; 302 chg_type >>= STATUS2_CHGTYP_SHIFT; 303 304 if (chg_type == MAX14577_CHARGER_TYPE_NONE) { 305 *attached = false; 306 307 cable_type = info->prev_chg_type; 308 info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE; 309 } else { 310 *attached = true; 311 312 /* 313 * Check current cable state/cable type and store cable 314 * type(info->prev_chg_type) for handling cable when 315 * charger cable is detached. 316 */ 317 cable_type = info->prev_chg_type = chg_type; 318 } 319 320 break; 321 default: 322 dev_err(info->dev, "Unknown cable group (%d)\n", group); 323 cable_type = -EINVAL; 324 break; 325 } 326 327 return cable_type; 328 } 329 330 static int max14577_muic_jig_handler(struct max14577_muic_info *info, 331 int cable_type, bool attached) 332 { 333 int ret = 0; 334 u8 path = CTRL1_SW_OPEN; 335 336 dev_dbg(info->dev, 337 "external connector is %s (adc:0x%02x)\n", 338 attached ? "attached" : "detached", cable_type); 339 340 switch (cable_type) { 341 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: /* ADC_JIG_USB_OFF */ 342 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: /* ADC_JIG_USB_ON */ 343 /* PATH:AP_USB */ 344 path = CTRL1_SW_USB; 345 break; 346 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: /* ADC_JIG_UART_OFF */ 347 /* PATH:AP_UART */ 348 path = CTRL1_SW_UART; 349 break; 350 default: 351 dev_err(info->dev, "failed to detect %s jig cable\n", 352 attached ? "attached" : "detached"); 353 return -EINVAL; 354 } 355 356 ret = max14577_muic_set_path(info, path, attached); 357 if (ret < 0) 358 return ret; 359 360 extcon_set_state_sync(info->edev, EXTCON_JIG, attached); 361 362 return 0; 363 } 364 365 static int max14577_muic_adc_handler(struct max14577_muic_info *info) 366 { 367 int cable_type; 368 bool attached; 369 int ret = 0; 370 371 /* Check accessory state which is either detached or attached */ 372 cable_type = max14577_muic_get_cable_type(info, 373 MAX14577_CABLE_GROUP_ADC, &attached); 374 375 dev_dbg(info->dev, 376 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n", 377 attached ? "attached" : "detached", cable_type, 378 info->prev_cable_type); 379 380 switch (cable_type) { 381 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: 382 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: 383 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: 384 /* JIG */ 385 ret = max14577_muic_jig_handler(info, cable_type, attached); 386 if (ret < 0) 387 return ret; 388 break; 389 case MAX14577_MUIC_ADC_GROUND: 390 case MAX14577_MUIC_ADC_SEND_END_BUTTON: 391 case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON: 392 case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON: 393 case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON: 394 case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON: 395 case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON: 396 case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON: 397 case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON: 398 case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON: 399 case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON: 400 case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON: 401 case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON: 402 case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON: 403 case MAX14577_MUIC_ADC_RESERVED_ACC_1: 404 case MAX14577_MUIC_ADC_RESERVED_ACC_2: 405 case MAX14577_MUIC_ADC_RESERVED_ACC_3: 406 case MAX14577_MUIC_ADC_RESERVED_ACC_4: 407 case MAX14577_MUIC_ADC_RESERVED_ACC_5: 408 case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2: 409 case MAX14577_MUIC_ADC_PHONE_POWERED_DEV: 410 case MAX14577_MUIC_ADC_TTY_CONVERTER: 411 case MAX14577_MUIC_ADC_UART_CABLE: 412 case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG: 413 case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD: 414 case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG: 415 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON: 416 case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1: 417 /* 418 * This accessory isn't used in general case if it is specially 419 * needed to detect additional accessory, should implement 420 * proper operation when this accessory is attached/detached. 421 */ 422 dev_info(info->dev, 423 "accessory is %s but it isn't used (adc:0x%x)\n", 424 attached ? "attached" : "detached", cable_type); 425 return -EAGAIN; 426 default: 427 dev_err(info->dev, 428 "failed to detect %s accessory (adc:0x%x)\n", 429 attached ? "attached" : "detached", cable_type); 430 return -EINVAL; 431 } 432 433 return 0; 434 } 435 436 static int max14577_muic_chg_handler(struct max14577_muic_info *info) 437 { 438 int chg_type; 439 bool attached; 440 int ret = 0; 441 442 chg_type = max14577_muic_get_cable_type(info, 443 MAX14577_CABLE_GROUP_CHG, &attached); 444 445 dev_dbg(info->dev, 446 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n", 447 attached ? "attached" : "detached", 448 chg_type, info->prev_chg_type); 449 450 switch (chg_type) { 451 case MAX14577_CHARGER_TYPE_USB: 452 /* PATH:AP_USB */ 453 ret = max14577_muic_set_path(info, info->path_usb, attached); 454 if (ret < 0) 455 return ret; 456 457 extcon_set_state_sync(info->edev, EXTCON_USB, attached); 458 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP, 459 attached); 460 break; 461 case MAX14577_CHARGER_TYPE_DEDICATED_CHG: 462 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP, 463 attached); 464 break; 465 case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT: 466 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP, 467 attached); 468 break; 469 case MAX14577_CHARGER_TYPE_SPECIAL_500MA: 470 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW, 471 attached); 472 break; 473 case MAX14577_CHARGER_TYPE_SPECIAL_1A: 474 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST, 475 attached); 476 break; 477 case MAX14577_CHARGER_TYPE_NONE: 478 case MAX14577_CHARGER_TYPE_DEAD_BATTERY: 479 break; 480 default: 481 dev_err(info->dev, 482 "failed to detect %s accessory (chg_type:0x%x)\n", 483 attached ? "attached" : "detached", chg_type); 484 return -EINVAL; 485 } 486 487 return 0; 488 } 489 490 static void max14577_muic_irq_work(struct work_struct *work) 491 { 492 struct max14577_muic_info *info = container_of(work, 493 struct max14577_muic_info, irq_work); 494 int ret = 0; 495 496 if (!info->edev) 497 return; 498 499 mutex_lock(&info->mutex); 500 501 ret = max14577_bulk_read(info->max14577->regmap, 502 MAX14577_MUIC_REG_STATUS1, info->status, 2); 503 if (ret) { 504 dev_err(info->dev, "failed to read MUIC register\n"); 505 mutex_unlock(&info->mutex); 506 return; 507 } 508 509 if (info->irq_adc) { 510 ret = max14577_muic_adc_handler(info); 511 info->irq_adc = false; 512 } 513 if (info->irq_chg) { 514 ret = max14577_muic_chg_handler(info); 515 info->irq_chg = false; 516 } 517 518 if (ret < 0) 519 dev_err(info->dev, "failed to handle MUIC interrupt\n"); 520 521 mutex_unlock(&info->mutex); 522 } 523 524 /* 525 * Sets irq_adc or irq_chg in max14577_muic_info and returns 1. 526 * Returns 0 if irq_type does not match registered IRQ for this device type. 527 */ 528 static int max14577_parse_irq(struct max14577_muic_info *info, int irq_type) 529 { 530 switch (irq_type) { 531 case MAX14577_IRQ_INT1_ADC: 532 case MAX14577_IRQ_INT1_ADCLOW: 533 case MAX14577_IRQ_INT1_ADCERR: 534 /* 535 * Handle all of accessory except for 536 * type of charger accessory. 537 */ 538 info->irq_adc = true; 539 return 1; 540 case MAX14577_IRQ_INT2_CHGTYP: 541 case MAX14577_IRQ_INT2_CHGDETRUN: 542 case MAX14577_IRQ_INT2_DCDTMR: 543 case MAX14577_IRQ_INT2_DBCHG: 544 case MAX14577_IRQ_INT2_VBVOLT: 545 /* Handle charger accessory */ 546 info->irq_chg = true; 547 return 1; 548 default: 549 return 0; 550 } 551 } 552 553 /* 554 * Sets irq_adc or irq_chg in max14577_muic_info and returns 1. 555 * Returns 0 if irq_type does not match registered IRQ for this device type. 556 */ 557 static int max77836_parse_irq(struct max14577_muic_info *info, int irq_type) 558 { 559 /* First check common max14577 interrupts */ 560 if (max14577_parse_irq(info, irq_type)) 561 return 1; 562 563 switch (irq_type) { 564 case MAX77836_IRQ_INT1_ADC1K: 565 info->irq_adc = true; 566 return 1; 567 case MAX77836_IRQ_INT2_VIDRM: 568 /* Handle charger accessory */ 569 info->irq_chg = true; 570 return 1; 571 default: 572 return 0; 573 } 574 } 575 576 static irqreturn_t max14577_muic_irq_handler(int irq, void *data) 577 { 578 struct max14577_muic_info *info = data; 579 int i, irq_type = -1; 580 bool irq_parsed; 581 582 /* 583 * We may be called multiple times for different nested IRQ-s. 584 * Including changes in INT1_ADC and INT2_CGHTYP at once. 585 * However we only need to know whether it was ADC, charger 586 * or both interrupts so decode IRQ and turn on proper flags. 587 */ 588 for (i = 0; i < info->muic_irqs_num; i++) 589 if (irq == info->muic_irqs[i].virq) 590 irq_type = info->muic_irqs[i].irq; 591 592 switch (info->max14577->dev_type) { 593 case MAXIM_DEVICE_TYPE_MAX77836: 594 irq_parsed = max77836_parse_irq(info, irq_type); 595 break; 596 case MAXIM_DEVICE_TYPE_MAX14577: 597 default: 598 irq_parsed = max14577_parse_irq(info, irq_type); 599 break; 600 } 601 602 if (!irq_parsed) { 603 dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n", 604 irq_type); 605 return IRQ_HANDLED; 606 } 607 schedule_work(&info->irq_work); 608 609 return IRQ_HANDLED; 610 } 611 612 static int max14577_muic_detect_accessory(struct max14577_muic_info *info) 613 { 614 int ret = 0; 615 int adc; 616 int chg_type; 617 bool attached; 618 619 mutex_lock(&info->mutex); 620 621 /* Read STATUSx register to detect accessory */ 622 ret = max14577_bulk_read(info->max14577->regmap, 623 MAX14577_MUIC_REG_STATUS1, info->status, 2); 624 if (ret) { 625 dev_err(info->dev, "failed to read MUIC register\n"); 626 mutex_unlock(&info->mutex); 627 return ret; 628 } 629 630 adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC, 631 &attached); 632 if (attached && adc != MAX14577_MUIC_ADC_OPEN) { 633 ret = max14577_muic_adc_handler(info); 634 if (ret < 0) { 635 dev_err(info->dev, "Cannot detect accessory\n"); 636 mutex_unlock(&info->mutex); 637 return ret; 638 } 639 } 640 641 chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG, 642 &attached); 643 if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) { 644 ret = max14577_muic_chg_handler(info); 645 if (ret < 0) { 646 dev_err(info->dev, "Cannot detect charger accessory\n"); 647 mutex_unlock(&info->mutex); 648 return ret; 649 } 650 } 651 652 mutex_unlock(&info->mutex); 653 654 return 0; 655 } 656 657 static void max14577_muic_detect_cable_wq(struct work_struct *work) 658 { 659 struct max14577_muic_info *info = container_of(to_delayed_work(work), 660 struct max14577_muic_info, wq_detcable); 661 662 max14577_muic_detect_accessory(info); 663 } 664 665 static int max14577_muic_probe(struct platform_device *pdev) 666 { 667 struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); 668 struct max14577_muic_info *info; 669 int delay_jiffies; 670 int ret; 671 int i; 672 u8 id; 673 674 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 675 if (!info) 676 return -ENOMEM; 677 678 info->dev = &pdev->dev; 679 info->max14577 = max14577; 680 681 platform_set_drvdata(pdev, info); 682 mutex_init(&info->mutex); 683 684 INIT_WORK(&info->irq_work, max14577_muic_irq_work); 685 686 switch (max14577->dev_type) { 687 case MAXIM_DEVICE_TYPE_MAX77836: 688 info->muic_irqs = max77836_muic_irqs; 689 info->muic_irqs_num = ARRAY_SIZE(max77836_muic_irqs); 690 break; 691 case MAXIM_DEVICE_TYPE_MAX14577: 692 default: 693 info->muic_irqs = max14577_muic_irqs; 694 info->muic_irqs_num = ARRAY_SIZE(max14577_muic_irqs); 695 } 696 697 /* Support irq domain for max14577 MUIC device */ 698 for (i = 0; i < info->muic_irqs_num; i++) { 699 struct max14577_muic_irq *muic_irq = &info->muic_irqs[i]; 700 int virq = 0; 701 702 virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq); 703 if (virq <= 0) 704 return -EINVAL; 705 muic_irq->virq = virq; 706 707 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL, 708 max14577_muic_irq_handler, 709 IRQF_NO_SUSPEND, 710 muic_irq->name, info); 711 if (ret) { 712 dev_err(&pdev->dev, 713 "failed: irq request (IRQ: %d, error :%d)\n", 714 muic_irq->irq, ret); 715 return ret; 716 } 717 } 718 719 /* Initialize extcon device */ 720 info->edev = devm_extcon_dev_allocate(&pdev->dev, 721 max14577_extcon_cable); 722 if (IS_ERR(info->edev)) { 723 dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); 724 return -ENOMEM; 725 } 726 727 ret = devm_extcon_dev_register(&pdev->dev, info->edev); 728 if (ret) { 729 dev_err(&pdev->dev, "failed to register extcon device\n"); 730 return ret; 731 } 732 733 /* Default h/w line path */ 734 info->path_usb = CTRL1_SW_USB; 735 info->path_uart = CTRL1_SW_UART; 736 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); 737 738 /* Set initial path for UART */ 739 max14577_muic_set_path(info, info->path_uart, true); 740 741 /* Check revision number of MUIC device*/ 742 ret = max14577_read_reg(info->max14577->regmap, 743 MAX14577_REG_DEVICEID, &id); 744 if (ret < 0) { 745 dev_err(&pdev->dev, "failed to read revision number\n"); 746 return ret; 747 } 748 dev_info(info->dev, "device ID : 0x%x\n", id); 749 750 /* Set ADC debounce time */ 751 max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS); 752 753 /* 754 * Detect accessory after completing the initialization of platform 755 * 756 * - Use delayed workqueue to detect cable state and then 757 * notify cable state to notifiee/platform through uevent. 758 * After completing the booting of platform, the extcon provider 759 * driver should notify cable state to upper layer. 760 */ 761 INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq); 762 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable, 763 delay_jiffies); 764 765 return ret; 766 } 767 768 static int max14577_muic_remove(struct platform_device *pdev) 769 { 770 struct max14577_muic_info *info = platform_get_drvdata(pdev); 771 772 cancel_work_sync(&info->irq_work); 773 774 return 0; 775 } 776 777 static const struct platform_device_id max14577_muic_id[] = { 778 { "max14577-muic", MAXIM_DEVICE_TYPE_MAX14577, }, 779 { "max77836-muic", MAXIM_DEVICE_TYPE_MAX77836, }, 780 { } 781 }; 782 MODULE_DEVICE_TABLE(platform, max14577_muic_id); 783 784 static struct platform_driver max14577_muic_driver = { 785 .driver = { 786 .name = "max14577-muic", 787 }, 788 .probe = max14577_muic_probe, 789 .remove = max14577_muic_remove, 790 .id_table = max14577_muic_id, 791 }; 792 793 module_platform_driver(max14577_muic_driver); 794 795 MODULE_DESCRIPTION("Maxim 14577/77836 Extcon driver"); 796 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>"); 797 MODULE_LICENSE("GPL"); 798 MODULE_ALIAS("platform:extcon-max14577"); 799