1 /* 2 * extcon-max14577.c - MAX14577/77836 extcon driver to support MUIC 3 * 4 * Copyright (C) 2013,2014 Samsung Electronics 5 * Chanwoo Choi <[email protected]> 6 * Krzysztof Kozlowski <[email protected]> 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 /* max14577 MUIC device support below list of accessories(external connector) */ 152 enum { 153 EXTCON_CABLE_USB = 0, 154 EXTCON_CABLE_TA, 155 EXTCON_CABLE_FAST_CHARGER, 156 EXTCON_CABLE_SLOW_CHARGER, 157 EXTCON_CABLE_CHARGE_DOWNSTREAM, 158 EXTCON_CABLE_JIG, 159 160 _EXTCON_CABLE_NUM, 161 }; 162 163 static const char *max14577_extcon_cable[] = { 164 [EXTCON_CABLE_USB] = "USB", 165 [EXTCON_CABLE_TA] = "TA", 166 [EXTCON_CABLE_FAST_CHARGER] = "Fast-charger", 167 [EXTCON_CABLE_SLOW_CHARGER] = "Slow-charger", 168 [EXTCON_CABLE_CHARGE_DOWNSTREAM] = "Charge-downstream", 169 [EXTCON_CABLE_JIG] = "JIG", 170 171 NULL, 172 }; 173 174 /* 175 * max14577_muic_set_debounce_time - Set the debounce time of ADC 176 * @info: the instance including private data of max14577 MUIC 177 * @time: the debounce time of ADC 178 */ 179 static int max14577_muic_set_debounce_time(struct max14577_muic_info *info, 180 enum max14577_muic_adc_debounce_time time) 181 { 182 u8 ret; 183 184 switch (time) { 185 case ADC_DEBOUNCE_TIME_5MS: 186 case ADC_DEBOUNCE_TIME_10MS: 187 case ADC_DEBOUNCE_TIME_25MS: 188 case ADC_DEBOUNCE_TIME_38_62MS: 189 ret = max14577_update_reg(info->max14577->regmap, 190 MAX14577_MUIC_REG_CONTROL3, 191 CTRL3_ADCDBSET_MASK, 192 time << CTRL3_ADCDBSET_SHIFT); 193 if (ret) { 194 dev_err(info->dev, "failed to set ADC debounce time\n"); 195 return ret; 196 } 197 break; 198 default: 199 dev_err(info->dev, "invalid ADC debounce time\n"); 200 return -EINVAL; 201 } 202 203 return 0; 204 }; 205 206 /* 207 * max14577_muic_set_path - Set hardware line according to attached cable 208 * @info: the instance including private data of max14577 MUIC 209 * @value: the path according to attached cable 210 * @attached: the state of cable (true:attached, false:detached) 211 * 212 * The max14577 MUIC device share outside H/W line among a varity of cables 213 * so, this function set internal path of H/W line according to the type of 214 * attached cable. 215 */ 216 static int max14577_muic_set_path(struct max14577_muic_info *info, 217 u8 val, bool attached) 218 { 219 int ret = 0; 220 u8 ctrl1, ctrl2 = 0; 221 222 /* Set open state to path before changing hw path */ 223 ret = max14577_update_reg(info->max14577->regmap, 224 MAX14577_MUIC_REG_CONTROL1, 225 CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN); 226 if (ret < 0) { 227 dev_err(info->dev, "failed to update MUIC register\n"); 228 return ret; 229 } 230 231 if (attached) 232 ctrl1 = val; 233 else 234 ctrl1 = CTRL1_SW_OPEN; 235 236 ret = max14577_update_reg(info->max14577->regmap, 237 MAX14577_MUIC_REG_CONTROL1, 238 CLEAR_IDBEN_MICEN_MASK, ctrl1); 239 if (ret < 0) { 240 dev_err(info->dev, "failed to update MUIC register\n"); 241 return ret; 242 } 243 244 if (attached) 245 ctrl2 |= CTRL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */ 246 else 247 ctrl2 |= CTRL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */ 248 249 ret = max14577_update_reg(info->max14577->regmap, 250 MAX14577_REG_CONTROL2, 251 CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2); 252 if (ret < 0) { 253 dev_err(info->dev, "failed to update MUIC register\n"); 254 return ret; 255 } 256 257 dev_dbg(info->dev, 258 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n", 259 ctrl1, ctrl2, attached ? "attached" : "detached"); 260 261 return 0; 262 } 263 264 /* 265 * max14577_muic_get_cable_type - Return cable type and check cable state 266 * @info: the instance including private data of max14577 MUIC 267 * @group: the path according to attached cable 268 * @attached: store cable state and return 269 * 270 * This function check the cable state either attached or detached, 271 * and then divide precise type of cable according to cable group. 272 * - max14577_CABLE_GROUP_ADC 273 * - max14577_CABLE_GROUP_CHG 274 */ 275 static int max14577_muic_get_cable_type(struct max14577_muic_info *info, 276 enum max14577_muic_cable_group group, bool *attached) 277 { 278 int cable_type = 0; 279 int adc; 280 int chg_type; 281 282 switch (group) { 283 case MAX14577_CABLE_GROUP_ADC: 284 /* 285 * Read ADC value to check cable type and decide cable state 286 * according to cable type 287 */ 288 adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK; 289 adc >>= STATUS1_ADC_SHIFT; 290 291 /* 292 * Check current cable state/cable type and store cable type 293 * (info->prev_cable_type) for handling cable when cable is 294 * detached. 295 */ 296 if (adc == MAX14577_MUIC_ADC_OPEN) { 297 *attached = false; 298 299 cable_type = info->prev_cable_type; 300 info->prev_cable_type = MAX14577_MUIC_ADC_OPEN; 301 } else { 302 *attached = true; 303 304 cable_type = info->prev_cable_type = adc; 305 } 306 break; 307 case MAX14577_CABLE_GROUP_CHG: 308 /* 309 * Read charger type to check cable type and decide cable state 310 * according to type of charger cable. 311 */ 312 chg_type = info->status[MAX14577_MUIC_STATUS2] & 313 STATUS2_CHGTYP_MASK; 314 chg_type >>= STATUS2_CHGTYP_SHIFT; 315 316 if (chg_type == MAX14577_CHARGER_TYPE_NONE) { 317 *attached = false; 318 319 cable_type = info->prev_chg_type; 320 info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE; 321 } else { 322 *attached = true; 323 324 /* 325 * Check current cable state/cable type and store cable 326 * type(info->prev_chg_type) for handling cable when 327 * charger cable is detached. 328 */ 329 cable_type = info->prev_chg_type = chg_type; 330 } 331 332 break; 333 default: 334 dev_err(info->dev, "Unknown cable group (%d)\n", group); 335 cable_type = -EINVAL; 336 break; 337 } 338 339 return cable_type; 340 } 341 342 static int max14577_muic_jig_handler(struct max14577_muic_info *info, 343 int cable_type, bool attached) 344 { 345 int ret = 0; 346 u8 path = CTRL1_SW_OPEN; 347 348 dev_dbg(info->dev, 349 "external connector is %s (adc:0x%02x)\n", 350 attached ? "attached" : "detached", cable_type); 351 352 switch (cable_type) { 353 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: /* ADC_JIG_USB_OFF */ 354 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: /* ADC_JIG_USB_ON */ 355 /* PATH:AP_USB */ 356 path = CTRL1_SW_USB; 357 break; 358 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: /* ADC_JIG_UART_OFF */ 359 /* PATH:AP_UART */ 360 path = CTRL1_SW_UART; 361 break; 362 default: 363 dev_err(info->dev, "failed to detect %s jig cable\n", 364 attached ? "attached" : "detached"); 365 return -EINVAL; 366 } 367 368 ret = max14577_muic_set_path(info, path, attached); 369 if (ret < 0) 370 return ret; 371 372 extcon_set_cable_state(info->edev, "JIG", attached); 373 374 return 0; 375 } 376 377 static int max14577_muic_adc_handler(struct max14577_muic_info *info) 378 { 379 int cable_type; 380 bool attached; 381 int ret = 0; 382 383 /* Check accessory state which is either detached or attached */ 384 cable_type = max14577_muic_get_cable_type(info, 385 MAX14577_CABLE_GROUP_ADC, &attached); 386 387 dev_dbg(info->dev, 388 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n", 389 attached ? "attached" : "detached", cable_type, 390 info->prev_cable_type); 391 392 switch (cable_type) { 393 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: 394 case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: 395 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: 396 /* JIG */ 397 ret = max14577_muic_jig_handler(info, cable_type, attached); 398 if (ret < 0) 399 return ret; 400 break; 401 case MAX14577_MUIC_ADC_GROUND: 402 case MAX14577_MUIC_ADC_SEND_END_BUTTON: 403 case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON: 404 case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON: 405 case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON: 406 case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON: 407 case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON: 408 case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON: 409 case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON: 410 case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON: 411 case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON: 412 case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON: 413 case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON: 414 case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON: 415 case MAX14577_MUIC_ADC_RESERVED_ACC_1: 416 case MAX14577_MUIC_ADC_RESERVED_ACC_2: 417 case MAX14577_MUIC_ADC_RESERVED_ACC_3: 418 case MAX14577_MUIC_ADC_RESERVED_ACC_4: 419 case MAX14577_MUIC_ADC_RESERVED_ACC_5: 420 case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2: 421 case MAX14577_MUIC_ADC_PHONE_POWERED_DEV: 422 case MAX14577_MUIC_ADC_TTY_CONVERTER: 423 case MAX14577_MUIC_ADC_UART_CABLE: 424 case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG: 425 case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD: 426 case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG: 427 case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON: 428 case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1: 429 /* 430 * This accessory isn't used in general case if it is specially 431 * needed to detect additional accessory, should implement 432 * proper operation when this accessory is attached/detached. 433 */ 434 dev_info(info->dev, 435 "accessory is %s but it isn't used (adc:0x%x)\n", 436 attached ? "attached" : "detached", cable_type); 437 return -EAGAIN; 438 default: 439 dev_err(info->dev, 440 "failed to detect %s accessory (adc:0x%x)\n", 441 attached ? "attached" : "detached", cable_type); 442 return -EINVAL; 443 } 444 445 return 0; 446 } 447 448 static int max14577_muic_chg_handler(struct max14577_muic_info *info) 449 { 450 int chg_type; 451 bool attached; 452 int ret = 0; 453 454 chg_type = max14577_muic_get_cable_type(info, 455 MAX14577_CABLE_GROUP_CHG, &attached); 456 457 dev_dbg(info->dev, 458 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n", 459 attached ? "attached" : "detached", 460 chg_type, info->prev_chg_type); 461 462 switch (chg_type) { 463 case MAX14577_CHARGER_TYPE_USB: 464 /* PATH:AP_USB */ 465 ret = max14577_muic_set_path(info, info->path_usb, attached); 466 if (ret < 0) 467 return ret; 468 469 extcon_set_cable_state(info->edev, "USB", attached); 470 break; 471 case MAX14577_CHARGER_TYPE_DEDICATED_CHG: 472 extcon_set_cable_state(info->edev, "TA", attached); 473 break; 474 case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT: 475 extcon_set_cable_state(info->edev, 476 "Charge-downstream", attached); 477 break; 478 case MAX14577_CHARGER_TYPE_SPECIAL_500MA: 479 extcon_set_cable_state(info->edev, "Slow-charger", attached); 480 break; 481 case MAX14577_CHARGER_TYPE_SPECIAL_1A: 482 extcon_set_cable_state(info->edev, "Fast-charger", attached); 483 break; 484 case MAX14577_CHARGER_TYPE_NONE: 485 case MAX14577_CHARGER_TYPE_DEAD_BATTERY: 486 break; 487 default: 488 dev_err(info->dev, 489 "failed to detect %s accessory (chg_type:0x%x)\n", 490 attached ? "attached" : "detached", chg_type); 491 return -EINVAL; 492 } 493 494 return 0; 495 } 496 497 static void max14577_muic_irq_work(struct work_struct *work) 498 { 499 struct max14577_muic_info *info = container_of(work, 500 struct max14577_muic_info, irq_work); 501 int ret = 0; 502 503 if (!info->edev) 504 return; 505 506 mutex_lock(&info->mutex); 507 508 ret = max14577_bulk_read(info->max14577->regmap, 509 MAX14577_MUIC_REG_STATUS1, info->status, 2); 510 if (ret) { 511 dev_err(info->dev, "failed to read MUIC register\n"); 512 mutex_unlock(&info->mutex); 513 return; 514 } 515 516 if (info->irq_adc) { 517 ret = max14577_muic_adc_handler(info); 518 info->irq_adc = false; 519 } 520 if (info->irq_chg) { 521 ret = max14577_muic_chg_handler(info); 522 info->irq_chg = false; 523 } 524 525 if (ret < 0) 526 dev_err(info->dev, "failed to handle MUIC interrupt\n"); 527 528 mutex_unlock(&info->mutex); 529 } 530 531 /* 532 * Sets irq_adc or irq_chg in max14577_muic_info and returns 1. 533 * Returns 0 if irq_type does not match registered IRQ for this device type. 534 */ 535 static int max14577_parse_irq(struct max14577_muic_info *info, int irq_type) 536 { 537 switch (irq_type) { 538 case MAX14577_IRQ_INT1_ADC: 539 case MAX14577_IRQ_INT1_ADCLOW: 540 case MAX14577_IRQ_INT1_ADCERR: 541 /* Handle all of accessory except for 542 type of charger accessory */ 543 info->irq_adc = true; 544 return 1; 545 case MAX14577_IRQ_INT2_CHGTYP: 546 case MAX14577_IRQ_INT2_CHGDETRUN: 547 case MAX14577_IRQ_INT2_DCDTMR: 548 case MAX14577_IRQ_INT2_DBCHG: 549 case MAX14577_IRQ_INT2_VBVOLT: 550 /* Handle charger accessory */ 551 info->irq_chg = true; 552 return 1; 553 default: 554 return 0; 555 } 556 } 557 558 /* 559 * Sets irq_adc or irq_chg in max14577_muic_info and returns 1. 560 * Returns 0 if irq_type does not match registered IRQ for this device type. 561 */ 562 static int max77836_parse_irq(struct max14577_muic_info *info, int irq_type) 563 { 564 /* First check common max14577 interrupts */ 565 if (max14577_parse_irq(info, irq_type)) 566 return 1; 567 568 switch (irq_type) { 569 case MAX77836_IRQ_INT1_ADC1K: 570 info->irq_adc = true; 571 return 1; 572 case MAX77836_IRQ_INT2_VIDRM: 573 /* Handle charger accessory */ 574 info->irq_chg = true; 575 return 1; 576 default: 577 return 0; 578 } 579 } 580 581 static irqreturn_t max14577_muic_irq_handler(int irq, void *data) 582 { 583 struct max14577_muic_info *info = data; 584 int i, irq_type = -1; 585 bool irq_parsed; 586 587 /* 588 * We may be called multiple times for different nested IRQ-s. 589 * Including changes in INT1_ADC and INT2_CGHTYP at once. 590 * However we only need to know whether it was ADC, charger 591 * or both interrupts so decode IRQ and turn on proper flags. 592 */ 593 for (i = 0; i < info->muic_irqs_num; i++) 594 if (irq == info->muic_irqs[i].virq) 595 irq_type = info->muic_irqs[i].irq; 596 597 switch (info->max14577->dev_type) { 598 case MAXIM_DEVICE_TYPE_MAX77836: 599 irq_parsed = max77836_parse_irq(info, irq_type); 600 break; 601 case MAXIM_DEVICE_TYPE_MAX14577: 602 default: 603 irq_parsed = max14577_parse_irq(info, irq_type); 604 break; 605 } 606 607 if (!irq_parsed) { 608 dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n", 609 irq_type); 610 return IRQ_HANDLED; 611 } 612 schedule_work(&info->irq_work); 613 614 return IRQ_HANDLED; 615 } 616 617 static int max14577_muic_detect_accessory(struct max14577_muic_info *info) 618 { 619 int ret = 0; 620 int adc; 621 int chg_type; 622 bool attached; 623 624 mutex_lock(&info->mutex); 625 626 /* Read STATUSx register to detect accessory */ 627 ret = max14577_bulk_read(info->max14577->regmap, 628 MAX14577_MUIC_REG_STATUS1, info->status, 2); 629 if (ret) { 630 dev_err(info->dev, "failed to read MUIC register\n"); 631 mutex_unlock(&info->mutex); 632 return ret; 633 } 634 635 adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC, 636 &attached); 637 if (attached && adc != MAX14577_MUIC_ADC_OPEN) { 638 ret = max14577_muic_adc_handler(info); 639 if (ret < 0) { 640 dev_err(info->dev, "Cannot detect accessory\n"); 641 mutex_unlock(&info->mutex); 642 return ret; 643 } 644 } 645 646 chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG, 647 &attached); 648 if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) { 649 ret = max14577_muic_chg_handler(info); 650 if (ret < 0) { 651 dev_err(info->dev, "Cannot detect charger accessory\n"); 652 mutex_unlock(&info->mutex); 653 return ret; 654 } 655 } 656 657 mutex_unlock(&info->mutex); 658 659 return 0; 660 } 661 662 static void max14577_muic_detect_cable_wq(struct work_struct *work) 663 { 664 struct max14577_muic_info *info = container_of(to_delayed_work(work), 665 struct max14577_muic_info, wq_detcable); 666 667 max14577_muic_detect_accessory(info); 668 } 669 670 static int max14577_muic_probe(struct platform_device *pdev) 671 { 672 struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); 673 struct max14577_muic_info *info; 674 int delay_jiffies; 675 int ret; 676 int i; 677 u8 id; 678 679 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 680 if (!info) 681 return -ENOMEM; 682 683 info->dev = &pdev->dev; 684 info->max14577 = max14577; 685 686 platform_set_drvdata(pdev, info); 687 mutex_init(&info->mutex); 688 689 INIT_WORK(&info->irq_work, max14577_muic_irq_work); 690 691 switch (max14577->dev_type) { 692 case MAXIM_DEVICE_TYPE_MAX77836: 693 info->muic_irqs = max77836_muic_irqs; 694 info->muic_irqs_num = ARRAY_SIZE(max77836_muic_irqs); 695 break; 696 case MAXIM_DEVICE_TYPE_MAX14577: 697 default: 698 info->muic_irqs = max14577_muic_irqs; 699 info->muic_irqs_num = ARRAY_SIZE(max14577_muic_irqs); 700 } 701 702 /* Support irq domain for max14577 MUIC device */ 703 for (i = 0; i < info->muic_irqs_num; i++) { 704 struct max14577_muic_irq *muic_irq = &info->muic_irqs[i]; 705 unsigned int virq = 0; 706 707 virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq); 708 if (virq <= 0) 709 return -EINVAL; 710 muic_irq->virq = virq; 711 712 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL, 713 max14577_muic_irq_handler, 714 IRQF_NO_SUSPEND, 715 muic_irq->name, info); 716 if (ret) { 717 dev_err(&pdev->dev, 718 "failed: irq request (IRQ: %d, error :%d)\n", 719 muic_irq->irq, ret); 720 return ret; 721 } 722 } 723 724 /* Initialize extcon device */ 725 info->edev = devm_extcon_dev_allocate(&pdev->dev, 726 max14577_extcon_cable); 727 if (IS_ERR(info->edev)) { 728 dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); 729 return -ENOMEM; 730 } 731 732 ret = devm_extcon_dev_register(&pdev->dev, info->edev); 733 if (ret) { 734 dev_err(&pdev->dev, "failed to register extcon device\n"); 735 return ret; 736 } 737 738 /* Default h/w line path */ 739 info->path_usb = CTRL1_SW_USB; 740 info->path_uart = CTRL1_SW_UART; 741 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); 742 743 /* Set initial path for UART */ 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 } 772 773 static int max14577_muic_remove(struct platform_device *pdev) 774 { 775 struct max14577_muic_info *info = platform_get_drvdata(pdev); 776 777 cancel_work_sync(&info->irq_work); 778 779 return 0; 780 } 781 782 static const struct platform_device_id max14577_muic_id[] = { 783 { "max14577-muic", MAXIM_DEVICE_TYPE_MAX14577, }, 784 { "max77836-muic", MAXIM_DEVICE_TYPE_MAX77836, }, 785 { } 786 }; 787 MODULE_DEVICE_TABLE(platform, max14577_muic_id); 788 789 static struct platform_driver max14577_muic_driver = { 790 .driver = { 791 .name = "max14577-muic", 792 }, 793 .probe = max14577_muic_probe, 794 .remove = max14577_muic_remove, 795 .id_table = max14577_muic_id, 796 }; 797 798 module_platform_driver(max14577_muic_driver); 799 800 MODULE_DESCRIPTION("Maxim 14577/77836 Extcon driver"); 801 MODULE_AUTHOR("Chanwoo Choi <[email protected]>, Krzysztof Kozlowski <[email protected]>"); 802 MODULE_LICENSE("GPL"); 803 MODULE_ALIAS("platform:extcon-max14577"); 804