1 /* 2 * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC 3 * 4 * Copyright (C) 2012 Samsung Electronics 5 * Donggeun Kim <[email protected]> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 #include <linux/i2c.h> 21 #include <linux/slab.h> 22 #include <linux/interrupt.h> 23 #include <linux/err.h> 24 #include <linux/platform_device.h> 25 #include <linux/kobject.h> 26 #include <linux/mfd/max8997.h> 27 #include <linux/mfd/max8997-private.h> 28 #include <linux/extcon.h> 29 #include <linux/irqdomain.h> 30 31 #define DEV_NAME "max8997-muic" 32 #define DELAY_MS_DEFAULT 20000 /* unit: millisecond */ 33 34 enum max8997_muic_adc_debounce_time { 35 ADC_DEBOUNCE_TIME_0_5MS = 0, /* 0.5ms */ 36 ADC_DEBOUNCE_TIME_10MS, /* 10ms */ 37 ADC_DEBOUNCE_TIME_25MS, /* 25ms */ 38 ADC_DEBOUNCE_TIME_38_62MS, /* 38.62ms */ 39 }; 40 41 struct max8997_muic_irq { 42 unsigned int irq; 43 const char *name; 44 unsigned int virq; 45 }; 46 47 static struct max8997_muic_irq muic_irqs[] = { 48 { MAX8997_MUICIRQ_ADCError, "muic-ADCERROR" }, 49 { MAX8997_MUICIRQ_ADCLow, "muic-ADCLOW" }, 50 { MAX8997_MUICIRQ_ADC, "muic-ADC" }, 51 { MAX8997_MUICIRQ_VBVolt, "muic-VBVOLT" }, 52 { MAX8997_MUICIRQ_DBChg, "muic-DBCHG" }, 53 { MAX8997_MUICIRQ_DCDTmr, "muic-DCDTMR" }, 54 { MAX8997_MUICIRQ_ChgDetRun, "muic-CHGDETRUN" }, 55 { MAX8997_MUICIRQ_ChgTyp, "muic-CHGTYP" }, 56 { MAX8997_MUICIRQ_OVP, "muic-OVP" }, 57 }; 58 59 /* Define supported cable type */ 60 enum max8997_muic_acc_type { 61 MAX8997_MUIC_ADC_GROUND = 0x0, 62 MAX8997_MUIC_ADC_MHL, /* MHL*/ 63 MAX8997_MUIC_ADC_REMOTE_S1_BUTTON, 64 MAX8997_MUIC_ADC_REMOTE_S2_BUTTON, 65 MAX8997_MUIC_ADC_REMOTE_S3_BUTTON, 66 MAX8997_MUIC_ADC_REMOTE_S4_BUTTON, 67 MAX8997_MUIC_ADC_REMOTE_S5_BUTTON, 68 MAX8997_MUIC_ADC_REMOTE_S6_BUTTON, 69 MAX8997_MUIC_ADC_REMOTE_S7_BUTTON, 70 MAX8997_MUIC_ADC_REMOTE_S8_BUTTON, 71 MAX8997_MUIC_ADC_REMOTE_S9_BUTTON, 72 MAX8997_MUIC_ADC_REMOTE_S10_BUTTON, 73 MAX8997_MUIC_ADC_REMOTE_S11_BUTTON, 74 MAX8997_MUIC_ADC_REMOTE_S12_BUTTON, 75 MAX8997_MUIC_ADC_RESERVED_ACC_1, 76 MAX8997_MUIC_ADC_RESERVED_ACC_2, 77 MAX8997_MUIC_ADC_RESERVED_ACC_3, 78 MAX8997_MUIC_ADC_RESERVED_ACC_4, 79 MAX8997_MUIC_ADC_RESERVED_ACC_5, 80 MAX8997_MUIC_ADC_CEA936_AUDIO, 81 MAX8997_MUIC_ADC_PHONE_POWERED_DEV, 82 MAX8997_MUIC_ADC_TTY_CONVERTER, 83 MAX8997_MUIC_ADC_UART_CABLE, 84 MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG, 85 MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF, /* JIG-USB-OFF */ 86 MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON, /* JIG-USB-ON */ 87 MAX8997_MUIC_ADC_AV_CABLE_NOLOAD, /* DESKDOCK */ 88 MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG, 89 MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF, /* JIG-UART */ 90 MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON, /* CARDOCK */ 91 MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE, 92 MAX8997_MUIC_ADC_OPEN, /* OPEN */ 93 }; 94 95 enum max8997_muic_cable_group { 96 MAX8997_CABLE_GROUP_ADC = 0, 97 MAX8997_CABLE_GROUP_ADC_GND, 98 MAX8997_CABLE_GROUP_CHG, 99 MAX8997_CABLE_GROUP_VBVOLT, 100 }; 101 102 enum max8997_muic_usb_type { 103 MAX8997_USB_HOST, 104 MAX8997_USB_DEVICE, 105 }; 106 107 enum max8997_muic_charger_type { 108 MAX8997_CHARGER_TYPE_NONE = 0, 109 MAX8997_CHARGER_TYPE_USB, 110 MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT, 111 MAX8997_CHARGER_TYPE_DEDICATED_CHG, 112 MAX8997_CHARGER_TYPE_500MA, 113 MAX8997_CHARGER_TYPE_1A, 114 MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7, 115 }; 116 117 struct max8997_muic_info { 118 struct device *dev; 119 struct i2c_client *muic; 120 struct extcon_dev *edev; 121 int prev_cable_type; 122 int prev_chg_type; 123 u8 status[2]; 124 125 int irq; 126 struct work_struct irq_work; 127 struct mutex mutex; 128 129 struct max8997_muic_platform_data *muic_pdata; 130 enum max8997_muic_charger_type pre_charger_type; 131 132 /* 133 * Use delayed workqueue to detect cable state and then 134 * notify cable state to notifiee/platform through uevent. 135 * After completing the booting of platform, the extcon provider 136 * driver should notify cable state to upper layer. 137 */ 138 struct delayed_work wq_detcable; 139 140 /* 141 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB 142 * h/w path of COMP2/COMN1 on CONTROL1 register. 143 */ 144 int path_usb; 145 int path_uart; 146 }; 147 148 enum { 149 EXTCON_CABLE_USB = 0, 150 EXTCON_CABLE_USB_HOST, 151 EXTCON_CABLE_TA, 152 EXTCON_CABLE_FAST_CHARGER, 153 EXTCON_CABLE_SLOW_CHARGER, 154 EXTCON_CABLE_CHARGE_DOWNSTREAM, 155 EXTCON_CABLE_MHL, 156 EXTCON_CABLE_DOCK, 157 EXTCON_CABLE_JIG, 158 159 _EXTCON_CABLE_NUM, 160 }; 161 162 static const char *max8997_extcon_cable[] = { 163 [EXTCON_CABLE_USB] = "USB", 164 [EXTCON_CABLE_USB_HOST] = "USB-Host", 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_MHL] = "MHL", 170 [EXTCON_CABLE_DOCK] = "DOCK", 171 [EXTCON_CABLE_JIG] = "JIG", 172 173 NULL, 174 }; 175 176 /* 177 * max8997_muic_set_debounce_time - Set the debounce time of ADC 178 * @info: the instance including private data of max8997 MUIC 179 * @time: the debounce time of ADC 180 */ 181 static int max8997_muic_set_debounce_time(struct max8997_muic_info *info, 182 enum max8997_muic_adc_debounce_time time) 183 { 184 int ret; 185 186 switch (time) { 187 case ADC_DEBOUNCE_TIME_0_5MS: 188 case ADC_DEBOUNCE_TIME_10MS: 189 case ADC_DEBOUNCE_TIME_25MS: 190 case ADC_DEBOUNCE_TIME_38_62MS: 191 ret = max8997_update_reg(info->muic, 192 MAX8997_MUIC_REG_CONTROL3, 193 time << CONTROL3_ADCDBSET_SHIFT, 194 CONTROL3_ADCDBSET_MASK); 195 if (ret) { 196 dev_err(info->dev, "failed to set ADC debounce time\n"); 197 return ret; 198 } 199 break; 200 default: 201 dev_err(info->dev, "invalid ADC debounce time\n"); 202 return -EINVAL; 203 } 204 205 return 0; 206 }; 207 208 /* 209 * max8997_muic_set_path - Set hardware line according to attached cable 210 * @info: the instance including private data of max8997 MUIC 211 * @value: the path according to attached cable 212 * @attached: the state of cable (true:attached, false:detached) 213 * 214 * The max8997 MUIC device share outside H/W line among a varity of cables, 215 * so this function set internal path of H/W line according to the type of 216 * attached cable. 217 */ 218 static int max8997_muic_set_path(struct max8997_muic_info *info, 219 u8 val, bool attached) 220 { 221 int ret = 0; 222 u8 ctrl1, ctrl2 = 0; 223 224 if (attached) 225 ctrl1 = val; 226 else 227 ctrl1 = CONTROL1_SW_OPEN; 228 229 ret = max8997_update_reg(info->muic, 230 MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK); 231 if (ret < 0) { 232 dev_err(info->dev, "failed to update MUIC register\n"); 233 return ret; 234 } 235 236 if (attached) 237 ctrl2 |= CONTROL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */ 238 else 239 ctrl2 |= CONTROL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */ 240 241 ret = max8997_update_reg(info->muic, 242 MAX8997_MUIC_REG_CONTROL2, ctrl2, 243 CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK); 244 if (ret < 0) { 245 dev_err(info->dev, "failed to update MUIC register\n"); 246 return ret; 247 } 248 249 dev_info(info->dev, 250 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n", 251 ctrl1, ctrl2, attached ? "attached" : "detached"); 252 253 return 0; 254 } 255 256 /* 257 * max8997_muic_get_cable_type - Return cable type and check cable state 258 * @info: the instance including private data of max8997 MUIC 259 * @group: the path according to attached cable 260 * @attached: store cable state and return 261 * 262 * This function check the cable state either attached or detached, 263 * and then divide precise type of cable according to cable group. 264 * - MAX8997_CABLE_GROUP_ADC 265 * - MAX8997_CABLE_GROUP_CHG 266 */ 267 static int max8997_muic_get_cable_type(struct max8997_muic_info *info, 268 enum max8997_muic_cable_group group, bool *attached) 269 { 270 int cable_type = 0; 271 int adc; 272 int chg_type; 273 274 switch (group) { 275 case MAX8997_CABLE_GROUP_ADC: 276 /* 277 * Read ADC value to check cable type and decide cable state 278 * according to cable type 279 */ 280 adc = info->status[0] & STATUS1_ADC_MASK; 281 adc >>= STATUS1_ADC_SHIFT; 282 283 /* 284 * Check current cable state/cable type and store cable type 285 * (info->prev_cable_type) for handling cable when cable is 286 * detached. 287 */ 288 if (adc == MAX8997_MUIC_ADC_OPEN) { 289 *attached = false; 290 291 cable_type = info->prev_cable_type; 292 info->prev_cable_type = MAX8997_MUIC_ADC_OPEN; 293 } else { 294 *attached = true; 295 296 cable_type = info->prev_cable_type = adc; 297 } 298 break; 299 case MAX8997_CABLE_GROUP_CHG: 300 /* 301 * Read charger type to check cable type and decide cable state 302 * according to type of charger cable. 303 */ 304 chg_type = info->status[1] & STATUS2_CHGTYP_MASK; 305 chg_type >>= STATUS2_CHGTYP_SHIFT; 306 307 if (chg_type == MAX8997_CHARGER_TYPE_NONE) { 308 *attached = false; 309 310 cable_type = info->prev_chg_type; 311 info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE; 312 } else { 313 *attached = true; 314 315 /* 316 * Check current cable state/cable type and store cable 317 * type(info->prev_chg_type) for handling cable when 318 * charger cable is detached. 319 */ 320 cable_type = info->prev_chg_type = chg_type; 321 } 322 323 break; 324 default: 325 dev_err(info->dev, "Unknown cable group (%d)\n", group); 326 cable_type = -EINVAL; 327 break; 328 } 329 330 return cable_type; 331 } 332 333 static int max8997_muic_handle_usb(struct max8997_muic_info *info, 334 enum max8997_muic_usb_type usb_type, bool attached) 335 { 336 int ret = 0; 337 338 if (usb_type == MAX8997_USB_HOST) { 339 ret = max8997_muic_set_path(info, info->path_usb, attached); 340 if (ret < 0) { 341 dev_err(info->dev, "failed to update muic register\n"); 342 return ret; 343 } 344 } 345 346 switch (usb_type) { 347 case MAX8997_USB_HOST: 348 extcon_set_cable_state(info->edev, "USB-Host", attached); 349 break; 350 case MAX8997_USB_DEVICE: 351 extcon_set_cable_state(info->edev, "USB", attached); 352 break; 353 default: 354 dev_err(info->dev, "failed to detect %s usb cable\n", 355 attached ? "attached" : "detached"); 356 return -EINVAL; 357 } 358 359 return 0; 360 } 361 362 static int max8997_muic_handle_dock(struct max8997_muic_info *info, 363 int cable_type, bool attached) 364 { 365 int ret = 0; 366 367 ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached); 368 if (ret) { 369 dev_err(info->dev, "failed to update muic register\n"); 370 return ret; 371 } 372 373 switch (cable_type) { 374 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD: 375 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON: 376 extcon_set_cable_state(info->edev, "DOCK", attached); 377 break; 378 default: 379 dev_err(info->dev, "failed to detect %s dock device\n", 380 attached ? "attached" : "detached"); 381 return -EINVAL; 382 } 383 384 return 0; 385 } 386 387 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info, 388 bool attached) 389 { 390 int ret = 0; 391 392 /* switch to UART */ 393 ret = max8997_muic_set_path(info, info->path_uart, attached); 394 if (ret) { 395 dev_err(info->dev, "failed to update muic register\n"); 396 return ret; 397 } 398 399 extcon_set_cable_state(info->edev, "JIG", attached); 400 401 return 0; 402 } 403 404 static int max8997_muic_adc_handler(struct max8997_muic_info *info) 405 { 406 int cable_type; 407 bool attached; 408 int ret = 0; 409 410 /* Check cable state which is either detached or attached */ 411 cable_type = max8997_muic_get_cable_type(info, 412 MAX8997_CABLE_GROUP_ADC, &attached); 413 414 switch (cable_type) { 415 case MAX8997_MUIC_ADC_GROUND: 416 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached); 417 if (ret < 0) 418 return ret; 419 break; 420 case MAX8997_MUIC_ADC_MHL: 421 extcon_set_cable_state(info->edev, "MHL", attached); 422 break; 423 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF: 424 case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON: 425 ret = max8997_muic_handle_usb(info, 426 MAX8997_USB_DEVICE, attached); 427 if (ret < 0) 428 return ret; 429 break; 430 case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD: 431 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON: 432 ret = max8997_muic_handle_dock(info, cable_type, attached); 433 if (ret < 0) 434 return ret; 435 break; 436 case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF: 437 ret = max8997_muic_handle_jig_uart(info, attached); 438 break; 439 case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON: 440 case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON: 441 case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON: 442 case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON: 443 case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON: 444 case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON: 445 case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON: 446 case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON: 447 case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON: 448 case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON: 449 case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON: 450 case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON: 451 case MAX8997_MUIC_ADC_RESERVED_ACC_1: 452 case MAX8997_MUIC_ADC_RESERVED_ACC_2: 453 case MAX8997_MUIC_ADC_RESERVED_ACC_3: 454 case MAX8997_MUIC_ADC_RESERVED_ACC_4: 455 case MAX8997_MUIC_ADC_RESERVED_ACC_5: 456 case MAX8997_MUIC_ADC_CEA936_AUDIO: 457 case MAX8997_MUIC_ADC_PHONE_POWERED_DEV: 458 case MAX8997_MUIC_ADC_TTY_CONVERTER: 459 case MAX8997_MUIC_ADC_UART_CABLE: 460 case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG: 461 case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG: 462 case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE: 463 /* 464 * This cable isn't used in general case if it is specially 465 * needed to detect additional cable, should implement 466 * proper operation when this cable is attached/detached. 467 */ 468 dev_info(info->dev, 469 "cable is %s but it isn't used (type:0x%x)\n", 470 attached ? "attached" : "detached", cable_type); 471 return -EAGAIN; 472 default: 473 dev_err(info->dev, 474 "failed to detect %s unknown cable (type:0x%x)\n", 475 attached ? "attached" : "detached", cable_type); 476 return -EINVAL; 477 } 478 479 return 0; 480 } 481 482 static int max8997_muic_chg_handler(struct max8997_muic_info *info) 483 { 484 int chg_type; 485 bool attached; 486 int adc; 487 488 chg_type = max8997_muic_get_cable_type(info, 489 MAX8997_CABLE_GROUP_CHG, &attached); 490 491 switch (chg_type) { 492 case MAX8997_CHARGER_TYPE_NONE: 493 break; 494 case MAX8997_CHARGER_TYPE_USB: 495 adc = info->status[0] & STATUS1_ADC_MASK; 496 adc >>= STATUS1_ADC_SHIFT; 497 498 if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) { 499 max8997_muic_handle_usb(info, 500 MAX8997_USB_DEVICE, attached); 501 } 502 break; 503 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT: 504 extcon_set_cable_state(info->edev, 505 "Charge-downstream", attached); 506 break; 507 case MAX8997_CHARGER_TYPE_DEDICATED_CHG: 508 extcon_set_cable_state(info->edev, "TA", attached); 509 break; 510 case MAX8997_CHARGER_TYPE_500MA: 511 extcon_set_cable_state(info->edev, "Slow-charger", attached); 512 break; 513 case MAX8997_CHARGER_TYPE_1A: 514 extcon_set_cable_state(info->edev, "Fast-charger", attached); 515 break; 516 default: 517 dev_err(info->dev, 518 "failed to detect %s unknown chg cable (type:0x%x)\n", 519 attached ? "attached" : "detached", chg_type); 520 return -EINVAL; 521 } 522 523 return 0; 524 } 525 526 static void max8997_muic_irq_work(struct work_struct *work) 527 { 528 struct max8997_muic_info *info = container_of(work, 529 struct max8997_muic_info, irq_work); 530 int irq_type = 0; 531 int i, ret; 532 533 if (!info->edev) 534 return; 535 536 mutex_lock(&info->mutex); 537 538 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) 539 if (info->irq == muic_irqs[i].virq) 540 irq_type = muic_irqs[i].irq; 541 542 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1, 543 2, info->status); 544 if (ret) { 545 dev_err(info->dev, "failed to read muic register\n"); 546 mutex_unlock(&info->mutex); 547 return; 548 } 549 550 switch (irq_type) { 551 case MAX8997_MUICIRQ_ADCError: 552 case MAX8997_MUICIRQ_ADCLow: 553 case MAX8997_MUICIRQ_ADC: 554 /* Handle all of cable except for charger cable */ 555 ret = max8997_muic_adc_handler(info); 556 break; 557 case MAX8997_MUICIRQ_VBVolt: 558 case MAX8997_MUICIRQ_DBChg: 559 case MAX8997_MUICIRQ_DCDTmr: 560 case MAX8997_MUICIRQ_ChgDetRun: 561 case MAX8997_MUICIRQ_ChgTyp: 562 /* Handle charger cable */ 563 ret = max8997_muic_chg_handler(info); 564 break; 565 case MAX8997_MUICIRQ_OVP: 566 break; 567 default: 568 dev_info(info->dev, "misc interrupt: irq %d occurred\n", 569 irq_type); 570 mutex_unlock(&info->mutex); 571 return; 572 } 573 574 if (ret < 0) 575 dev_err(info->dev, "failed to handle MUIC interrupt\n"); 576 577 mutex_unlock(&info->mutex); 578 } 579 580 static irqreturn_t max8997_muic_irq_handler(int irq, void *data) 581 { 582 struct max8997_muic_info *info = data; 583 584 dev_dbg(info->dev, "irq:%d\n", irq); 585 info->irq = irq; 586 587 schedule_work(&info->irq_work); 588 589 return IRQ_HANDLED; 590 } 591 592 static int max8997_muic_detect_dev(struct max8997_muic_info *info) 593 { 594 int ret = 0; 595 int adc; 596 int chg_type; 597 bool attached; 598 599 mutex_lock(&info->mutex); 600 601 /* Read STATUSx register to detect accessory */ 602 ret = max8997_bulk_read(info->muic, 603 MAX8997_MUIC_REG_STATUS1, 2, info->status); 604 if (ret) { 605 dev_err(info->dev, "failed to read MUIC register\n"); 606 mutex_unlock(&info->mutex); 607 return ret; 608 } 609 610 adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC, 611 &attached); 612 if (attached && adc != MAX8997_MUIC_ADC_OPEN) { 613 ret = max8997_muic_adc_handler(info); 614 if (ret < 0) { 615 dev_err(info->dev, "Cannot detect ADC cable\n"); 616 mutex_unlock(&info->mutex); 617 return ret; 618 } 619 } 620 621 chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG, 622 &attached); 623 if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) { 624 ret = max8997_muic_chg_handler(info); 625 if (ret < 0) { 626 dev_err(info->dev, "Cannot detect charger cable\n"); 627 mutex_unlock(&info->mutex); 628 return ret; 629 } 630 } 631 632 mutex_unlock(&info->mutex); 633 634 return 0; 635 } 636 637 static void max8997_muic_detect_cable_wq(struct work_struct *work) 638 { 639 struct max8997_muic_info *info = container_of(to_delayed_work(work), 640 struct max8997_muic_info, wq_detcable); 641 int ret; 642 643 ret = max8997_muic_detect_dev(info); 644 if (ret < 0) 645 dev_err(info->dev, "failed to detect cable type\n"); 646 } 647 648 static int max8997_muic_probe(struct platform_device *pdev) 649 { 650 struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent); 651 struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev); 652 struct max8997_muic_info *info; 653 int delay_jiffies; 654 int ret, i; 655 656 info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info), 657 GFP_KERNEL); 658 if (!info) 659 return -ENOMEM; 660 661 info->dev = &pdev->dev; 662 info->muic = max8997->muic; 663 664 platform_set_drvdata(pdev, info); 665 mutex_init(&info->mutex); 666 667 INIT_WORK(&info->irq_work, max8997_muic_irq_work); 668 669 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) { 670 struct max8997_muic_irq *muic_irq = &muic_irqs[i]; 671 unsigned int virq = 0; 672 673 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq); 674 if (!virq) { 675 ret = -EINVAL; 676 goto err_irq; 677 } 678 muic_irq->virq = virq; 679 680 ret = request_threaded_irq(virq, NULL, 681 max8997_muic_irq_handler, 682 IRQF_NO_SUSPEND, 683 muic_irq->name, info); 684 if (ret) { 685 dev_err(&pdev->dev, 686 "failed: irq request (IRQ: %d, error :%d)\n", 687 muic_irq->irq, ret); 688 goto err_irq; 689 } 690 } 691 692 /* External connector */ 693 info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable); 694 if (IS_ERR(info->edev)) { 695 dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); 696 ret = -ENOMEM; 697 goto err_irq; 698 } 699 info->edev->name = DEV_NAME; 700 701 ret = devm_extcon_dev_register(&pdev->dev, info->edev); 702 if (ret) { 703 dev_err(&pdev->dev, "failed to register extcon device\n"); 704 goto err_irq; 705 } 706 707 if (pdata && pdata->muic_pdata) { 708 struct max8997_muic_platform_data *muic_pdata 709 = pdata->muic_pdata; 710 711 /* Initialize registers according to platform data */ 712 for (i = 0; i < muic_pdata->num_init_data; i++) { 713 max8997_write_reg(info->muic, 714 muic_pdata->init_data[i].addr, 715 muic_pdata->init_data[i].data); 716 } 717 718 /* 719 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB 720 * h/w path of COMP2/COMN1 on CONTROL1 register. 721 */ 722 if (muic_pdata->path_uart) 723 info->path_uart = muic_pdata->path_uart; 724 else 725 info->path_uart = CONTROL1_SW_UART; 726 727 if (muic_pdata->path_usb) 728 info->path_usb = muic_pdata->path_usb; 729 else 730 info->path_usb = CONTROL1_SW_USB; 731 732 /* 733 * Default delay time for detecting cable state 734 * after certain time. 735 */ 736 if (muic_pdata->detcable_delay_ms) 737 delay_jiffies = 738 msecs_to_jiffies(muic_pdata->detcable_delay_ms); 739 else 740 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); 741 } else { 742 info->path_uart = CONTROL1_SW_UART; 743 info->path_usb = CONTROL1_SW_USB; 744 delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); 745 } 746 747 /* Set initial path for UART */ 748 max8997_muic_set_path(info, info->path_uart, true); 749 750 /* Set ADC debounce time */ 751 max8997_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, max8997_muic_detect_cable_wq); 762 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable, 763 delay_jiffies); 764 765 return 0; 766 767 err_irq: 768 while (--i >= 0) 769 free_irq(muic_irqs[i].virq, info); 770 return ret; 771 } 772 773 static int max8997_muic_remove(struct platform_device *pdev) 774 { 775 struct max8997_muic_info *info = platform_get_drvdata(pdev); 776 int i; 777 778 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) 779 free_irq(muic_irqs[i].virq, info); 780 cancel_work_sync(&info->irq_work); 781 782 return 0; 783 } 784 785 static struct platform_driver max8997_muic_driver = { 786 .driver = { 787 .name = DEV_NAME, 788 }, 789 .probe = max8997_muic_probe, 790 .remove = max8997_muic_remove, 791 }; 792 793 module_platform_driver(max8997_muic_driver); 794 795 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver"); 796 MODULE_AUTHOR("Donggeun Kim <[email protected]>"); 797 MODULE_LICENSE("GPL"); 798