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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * extcon-rt8973a.c - Richtek RT8973A extcon driver to support USB switches4 *5 * Copyright (c) 2014 Samsung Electronics Co., Ltd6 * Author: Chanwoo Choi <cw00.choi@samsung.com>7 */8 9#include <linux/err.h>10#include <linux/i2c.h>11#include <linux/input.h>12#include <linux/interrupt.h>13#include <linux/irqdomain.h>14#include <linux/kernel.h>15#include <linux/module.h>16#include <linux/platform_device.h>17#include <linux/regmap.h>18#include <linux/slab.h>19#include <linux/extcon-provider.h>20 21#include "extcon-rt8973a.h"22 23#define DELAY_MS_DEFAULT 20000 /* unit: millisecond */24 25struct muic_irq {26 unsigned int irq;27 const char *name;28 unsigned int virq;29};30 31struct reg_data {32 u8 reg;33 u8 mask;34 u8 val;35 bool invert;36};37 38struct rt8973a_muic_info {39 struct device *dev;40 struct extcon_dev *edev;41 42 struct i2c_client *i2c;43 struct regmap *regmap;44 45 struct regmap_irq_chip_data *irq_data;46 struct muic_irq *muic_irqs;47 unsigned int num_muic_irqs;48 int irq;49 bool irq_attach;50 bool irq_detach;51 bool irq_ovp;52 bool irq_otp;53 struct work_struct irq_work;54 55 struct reg_data *reg_data;56 unsigned int num_reg_data;57 bool auto_config;58 59 struct mutex mutex;60 61 /*62 * Use delayed workqueue to detect cable state and then63 * notify cable state to notifiee/platform through uevent.64 * After completing the booting of platform, the extcon provider65 * driver should notify cable state to upper layer.66 */67 struct delayed_work wq_detcable;68};69 70/* Default value of RT8973A register to bring up MUIC device. */71static struct reg_data rt8973a_reg_data[] = {72 {73 .reg = RT8973A_REG_CONTROL1,74 .mask = RT8973A_REG_CONTROL1_ADC_EN_MASK75 | RT8973A_REG_CONTROL1_USB_CHD_EN_MASK76 | RT8973A_REG_CONTROL1_CHGTYP_MASK77 | RT8973A_REG_CONTROL1_SWITCH_OPEN_MASK78 | RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK79 | RT8973A_REG_CONTROL1_INTM_MASK,80 .val = RT8973A_REG_CONTROL1_ADC_EN_MASK81 | RT8973A_REG_CONTROL1_USB_CHD_EN_MASK82 | RT8973A_REG_CONTROL1_CHGTYP_MASK,83 .invert = false,84 },85 { /* sentinel */ }86};87 88/* List of detectable cables */89static const unsigned int rt8973a_extcon_cable[] = {90 EXTCON_USB,91 EXTCON_USB_HOST,92 EXTCON_CHG_USB_SDP,93 EXTCON_CHG_USB_DCP,94 EXTCON_JIG,95 EXTCON_NONE,96};97 98/* Define OVP (Over Voltage Protection), OTP (Over Temperature Protection) */99enum rt8973a_event_type {100 RT8973A_EVENT_ATTACH = 1,101 RT8973A_EVENT_DETACH,102 RT8973A_EVENT_OVP,103 RT8973A_EVENT_OTP,104};105 106/* Define supported accessory type */107enum rt8973a_muic_acc_type {108 RT8973A_MUIC_ADC_OTG = 0x0,109 RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON,110 RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON,111 RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON,112 RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON,113 RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON,114 RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON,115 RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON,116 RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON,117 RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON,118 RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON,119 RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON,120 RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON,121 RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON,122 RT8973A_MUIC_ADC_RESERVED_ACC_1,123 RT8973A_MUIC_ADC_RESERVED_ACC_2,124 RT8973A_MUIC_ADC_RESERVED_ACC_3,125 RT8973A_MUIC_ADC_RESERVED_ACC_4,126 RT8973A_MUIC_ADC_RESERVED_ACC_5,127 RT8973A_MUIC_ADC_AUDIO_TYPE2,128 RT8973A_MUIC_ADC_PHONE_POWERED_DEV,129 RT8973A_MUIC_ADC_UNKNOWN_ACC_1,130 RT8973A_MUIC_ADC_UNKNOWN_ACC_2,131 RT8973A_MUIC_ADC_TA,132 RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,133 RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,134 RT8973A_MUIC_ADC_UNKNOWN_ACC_3,135 RT8973A_MUIC_ADC_UNKNOWN_ACC_4,136 RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,137 RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,138 RT8973A_MUIC_ADC_UNKNOWN_ACC_5,139 RT8973A_MUIC_ADC_OPEN = 0x1f,140 141 /*142 * The below accessories has same ADC value (0x1f).143 * So, Device type1 is used to separate specific accessory.144 */145 /* |---------|--ADC| */146 /* | [7:5]|[4:0]| */147 RT8973A_MUIC_ADC_USB = 0x3f, /* | 001|11111| */148};149 150/* List of supported interrupt for RT8973A */151static struct muic_irq rt8973a_muic_irqs[] = {152 { RT8973A_INT1_ATTACH, "muic-attach" },153 { RT8973A_INT1_DETACH, "muic-detach" },154 { RT8973A_INT1_CHGDET, "muic-chgdet" },155 { RT8973A_INT1_DCD_T, "muic-dcd-t" },156 { RT8973A_INT1_OVP, "muic-ovp" },157 { RT8973A_INT1_CONNECT, "muic-connect" },158 { RT8973A_INT1_ADC_CHG, "muic-adc-chg" },159 { RT8973A_INT1_OTP, "muic-otp" },160 { RT8973A_INT2_UVLO, "muic-uvlo" },161 { RT8973A_INT2_POR, "muic-por" },162 { RT8973A_INT2_OTP_FET, "muic-otp-fet" },163 { RT8973A_INT2_OVP_FET, "muic-ovp-fet" },164 { RT8973A_INT2_OCP_LATCH, "muic-ocp-latch" },165 { RT8973A_INT2_OCP, "muic-ocp" },166 { RT8973A_INT2_OVP_OCP, "muic-ovp-ocp" },167};168 169/* Define interrupt list of RT8973A to register regmap_irq */170static const struct regmap_irq rt8973a_irqs[] = {171 /* INT1 interrupts */172 { .reg_offset = 0, .mask = RT8973A_INT1_ATTACH_MASK, },173 { .reg_offset = 0, .mask = RT8973A_INT1_DETACH_MASK, },174 { .reg_offset = 0, .mask = RT8973A_INT1_CHGDET_MASK, },175 { .reg_offset = 0, .mask = RT8973A_INT1_DCD_T_MASK, },176 { .reg_offset = 0, .mask = RT8973A_INT1_OVP_MASK, },177 { .reg_offset = 0, .mask = RT8973A_INT1_CONNECT_MASK, },178 { .reg_offset = 0, .mask = RT8973A_INT1_ADC_CHG_MASK, },179 { .reg_offset = 0, .mask = RT8973A_INT1_OTP_MASK, },180 181 /* INT2 interrupts */182 { .reg_offset = 1, .mask = RT8973A_INT2_UVLOT_MASK,},183 { .reg_offset = 1, .mask = RT8973A_INT2_POR_MASK, },184 { .reg_offset = 1, .mask = RT8973A_INT2_OTP_FET_MASK, },185 { .reg_offset = 1, .mask = RT8973A_INT2_OVP_FET_MASK, },186 { .reg_offset = 1, .mask = RT8973A_INT2_OCP_LATCH_MASK, },187 { .reg_offset = 1, .mask = RT8973A_INT2_OCP_MASK, },188 { .reg_offset = 1, .mask = RT8973A_INT2_OVP_OCP_MASK, },189};190 191static const struct regmap_irq_chip rt8973a_muic_irq_chip = {192 .name = "rt8973a",193 .status_base = RT8973A_REG_INT1,194 .mask_base = RT8973A_REG_INTM1,195 .num_regs = 2,196 .irqs = rt8973a_irqs,197 .num_irqs = ARRAY_SIZE(rt8973a_irqs),198};199 200/* Define regmap configuration of RT8973A for I2C communication */201static bool rt8973a_muic_volatile_reg(struct device *dev, unsigned int reg)202{203 switch (reg) {204 case RT8973A_REG_INTM1:205 case RT8973A_REG_INTM2:206 return true;207 default:208 break;209 }210 return false;211}212 213static const struct regmap_config rt8973a_muic_regmap_config = {214 .reg_bits = 8,215 .val_bits = 8,216 .volatile_reg = rt8973a_muic_volatile_reg,217 .max_register = RT8973A_REG_END,218};219 220/* Change DM_CON/DP_CON/VBUSIN switch according to cable type */221static int rt8973a_muic_set_path(struct rt8973a_muic_info *info,222 unsigned int con_sw, bool attached)223{224 int ret;225 226 /*227 * Don't need to set h/w path according to cable type228 * if Auto-configuration mode of CONTROL1 register is true.229 */230 if (info->auto_config)231 return 0;232 233 if (!attached)234 con_sw = DM_DP_SWITCH_UART;235 236 switch (con_sw) {237 case DM_DP_SWITCH_OPEN:238 case DM_DP_SWITCH_USB:239 case DM_DP_SWITCH_UART:240 ret = regmap_update_bits(info->regmap, RT8973A_REG_MANUAL_SW1,241 RT8973A_REG_MANUAL_SW1_DP_MASK |242 RT8973A_REG_MANUAL_SW1_DM_MASK,243 con_sw);244 if (ret < 0) {245 dev_err(info->dev,246 "cannot update DM_CON/DP_CON switch\n");247 return ret;248 }249 break;250 default:251 dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",252 con_sw);253 return -EINVAL;254 }255 256 return 0;257}258 259static int rt8973a_muic_get_cable_type(struct rt8973a_muic_info *info)260{261 unsigned int adc, dev1;262 int ret, cable_type;263 264 /* Read ADC value according to external cable or button */265 ret = regmap_read(info->regmap, RT8973A_REG_ADC, &adc);266 if (ret) {267 dev_err(info->dev, "failed to read ADC register\n");268 return ret;269 }270 cable_type = adc & RT8973A_REG_ADC_MASK;271 272 /* Read Device 1 reigster to identify correct cable type */273 ret = regmap_read(info->regmap, RT8973A_REG_DEV1, &dev1);274 if (ret) {275 dev_err(info->dev, "failed to read DEV1 register\n");276 return ret;277 }278 279 switch (adc) {280 case RT8973A_MUIC_ADC_OPEN:281 if (dev1 & RT8973A_REG_DEV1_USB_MASK)282 cable_type = RT8973A_MUIC_ADC_USB;283 else if (dev1 & RT8973A_REG_DEV1_DCPORT_MASK)284 cable_type = RT8973A_MUIC_ADC_TA;285 else286 cable_type = RT8973A_MUIC_ADC_OPEN;287 break;288 default:289 break;290 }291 292 return cable_type;293}294 295static int rt8973a_muic_cable_handler(struct rt8973a_muic_info *info,296 enum rt8973a_event_type event)297{298 static unsigned int prev_cable_type;299 unsigned int con_sw = DM_DP_SWITCH_UART;300 int ret, cable_type;301 unsigned int id;302 bool attached = false;303 304 switch (event) {305 case RT8973A_EVENT_ATTACH:306 cable_type = rt8973a_muic_get_cable_type(info);307 attached = true;308 break;309 case RT8973A_EVENT_DETACH:310 cable_type = prev_cable_type;311 attached = false;312 break;313 case RT8973A_EVENT_OVP:314 case RT8973A_EVENT_OTP:315 dev_warn(info->dev,316 "happen Over %s issue. Need to disconnect all cables\n",317 event == RT8973A_EVENT_OVP ? "Voltage" : "Temperature");318 cable_type = prev_cable_type;319 attached = false;320 break;321 default:322 dev_err(info->dev,323 "Cannot handle this event (event:%d)\n", event);324 return -EINVAL;325 }326 prev_cable_type = cable_type;327 328 switch (cable_type) {329 case RT8973A_MUIC_ADC_OTG:330 id = EXTCON_USB_HOST;331 con_sw = DM_DP_SWITCH_USB;332 break;333 case RT8973A_MUIC_ADC_TA:334 id = EXTCON_CHG_USB_DCP;335 con_sw = DM_DP_SWITCH_OPEN;336 break;337 case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:338 case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:339 id = EXTCON_JIG;340 con_sw = DM_DP_SWITCH_USB;341 break;342 case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:343 case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:344 id = EXTCON_JIG;345 con_sw = DM_DP_SWITCH_UART;346 break;347 case RT8973A_MUIC_ADC_USB:348 id = EXTCON_USB;349 con_sw = DM_DP_SWITCH_USB;350 break;351 case RT8973A_MUIC_ADC_OPEN:352 return 0;353 case RT8973A_MUIC_ADC_UNKNOWN_ACC_1:354 case RT8973A_MUIC_ADC_UNKNOWN_ACC_2:355 case RT8973A_MUIC_ADC_UNKNOWN_ACC_3:356 case RT8973A_MUIC_ADC_UNKNOWN_ACC_4:357 case RT8973A_MUIC_ADC_UNKNOWN_ACC_5:358 dev_warn(info->dev,359 "Unknown accessory type (adc:0x%x)\n", cable_type);360 return 0;361 case RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON:362 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON:363 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON:364 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON:365 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON:366 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON:367 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON:368 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON:369 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON:370 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON:371 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON:372 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON:373 case RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON:374 case RT8973A_MUIC_ADC_AUDIO_TYPE2:375 dev_warn(info->dev,376 "Audio device/button type (adc:0x%x)\n", cable_type);377 return 0;378 case RT8973A_MUIC_ADC_RESERVED_ACC_1:379 case RT8973A_MUIC_ADC_RESERVED_ACC_2:380 case RT8973A_MUIC_ADC_RESERVED_ACC_3:381 case RT8973A_MUIC_ADC_RESERVED_ACC_4:382 case RT8973A_MUIC_ADC_RESERVED_ACC_5:383 case RT8973A_MUIC_ADC_PHONE_POWERED_DEV:384 return 0;385 default:386 dev_err(info->dev,387 "Cannot handle this cable_type (adc:0x%x)\n",388 cable_type);389 return -EINVAL;390 }391 392 /* Change internal hardware path(DM_CON/DP_CON) */393 ret = rt8973a_muic_set_path(info, con_sw, attached);394 if (ret < 0)395 return ret;396 397 /* Change the state of external accessory */398 extcon_set_state_sync(info->edev, id, attached);399 if (id == EXTCON_USB)400 extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,401 attached);402 403 return 0;404}405 406static void rt8973a_muic_irq_work(struct work_struct *work)407{408 struct rt8973a_muic_info *info = container_of(work,409 struct rt8973a_muic_info, irq_work);410 int ret = 0;411 412 if (!info->edev)413 return;414 415 mutex_lock(&info->mutex);416 417 /* Detect attached or detached cables */418 if (info->irq_attach) {419 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);420 info->irq_attach = false;421 }422 423 if (info->irq_detach) {424 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_DETACH);425 info->irq_detach = false;426 }427 428 if (info->irq_ovp) {429 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OVP);430 info->irq_ovp = false;431 }432 433 if (info->irq_otp) {434 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OTP);435 info->irq_otp = false;436 }437 438 if (ret < 0)439 dev_err(info->dev, "failed to handle MUIC interrupt\n");440 441 mutex_unlock(&info->mutex);442}443 444static irqreturn_t rt8973a_muic_irq_handler(int irq, void *data)445{446 struct rt8973a_muic_info *info = data;447 int i, irq_type = -1;448 449 for (i = 0; i < info->num_muic_irqs; i++)450 if (irq == info->muic_irqs[i].virq)451 irq_type = info->muic_irqs[i].irq;452 453 switch (irq_type) {454 case RT8973A_INT1_ATTACH:455 info->irq_attach = true;456 break;457 case RT8973A_INT1_DETACH:458 info->irq_detach = true;459 break;460 case RT8973A_INT1_OVP:461 info->irq_ovp = true;462 break;463 case RT8973A_INT1_OTP:464 info->irq_otp = true;465 break;466 case RT8973A_INT1_CHGDET:467 case RT8973A_INT1_DCD_T:468 case RT8973A_INT1_CONNECT:469 case RT8973A_INT1_ADC_CHG:470 case RT8973A_INT2_UVLO:471 case RT8973A_INT2_POR:472 case RT8973A_INT2_OTP_FET:473 case RT8973A_INT2_OVP_FET:474 case RT8973A_INT2_OCP_LATCH:475 case RT8973A_INT2_OCP:476 case RT8973A_INT2_OVP_OCP:477 default:478 dev_dbg(info->dev,479 "Cannot handle this interrupt (%d)\n", irq_type);480 break;481 }482 483 schedule_work(&info->irq_work);484 485 return IRQ_HANDLED;486}487 488static void rt8973a_muic_detect_cable_wq(struct work_struct *work)489{490 struct rt8973a_muic_info *info = container_of(to_delayed_work(work),491 struct rt8973a_muic_info, wq_detcable);492 int ret;493 494 /* Notify the state of connector cable or not */495 ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);496 if (ret < 0)497 dev_warn(info->dev, "failed to detect cable state\n");498}499 500static void rt8973a_init_dev_type(struct rt8973a_muic_info *info)501{502 unsigned int data, vendor_id, version_id;503 int i, ret;504 505 /* To test I2C, Print version_id and vendor_id of RT8973A */506 ret = regmap_read(info->regmap, RT8973A_REG_DEVICE_ID, &data);507 if (ret) {508 dev_err(info->dev,509 "failed to read DEVICE_ID register: %d\n", ret);510 return;511 }512 513 vendor_id = ((data & RT8973A_REG_DEVICE_ID_VENDOR_MASK) >>514 RT8973A_REG_DEVICE_ID_VENDOR_SHIFT);515 version_id = ((data & RT8973A_REG_DEVICE_ID_VERSION_MASK) >>516 RT8973A_REG_DEVICE_ID_VERSION_SHIFT);517 518 dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",519 version_id, vendor_id);520 521 /* Initiazle the register of RT8973A device to bring-up */522 for (i = 0; i < info->num_reg_data; i++) {523 u8 reg = info->reg_data[i].reg;524 u8 mask = info->reg_data[i].mask;525 u8 val = 0;526 527 if (info->reg_data[i].invert)528 val = ~info->reg_data[i].val;529 else530 val = info->reg_data[i].val;531 532 regmap_update_bits(info->regmap, reg, mask, val);533 }534 535 /* Check whether RT8973A is auto switching mode or not */536 ret = regmap_read(info->regmap, RT8973A_REG_CONTROL1, &data);537 if (ret) {538 dev_err(info->dev,539 "failed to read CONTROL1 register: %d\n", ret);540 return;541 }542 543 data &= RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK;544 if (data) {545 info->auto_config = true;546 dev_info(info->dev,547 "Enable Auto-configuration for internal path\n");548 }549}550 551static int rt8973a_muic_i2c_probe(struct i2c_client *i2c)552{553 struct device_node *np = i2c->dev.of_node;554 struct rt8973a_muic_info *info;555 int i, ret, irq_flags;556 557 if (!np)558 return -EINVAL;559 560 info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);561 if (!info)562 return -ENOMEM;563 i2c_set_clientdata(i2c, info);564 565 info->dev = &i2c->dev;566 info->i2c = i2c;567 info->irq = i2c->irq;568 info->muic_irqs = rt8973a_muic_irqs;569 info->num_muic_irqs = ARRAY_SIZE(rt8973a_muic_irqs);570 info->reg_data = rt8973a_reg_data;571 info->num_reg_data = ARRAY_SIZE(rt8973a_reg_data);572 573 mutex_init(&info->mutex);574 575 INIT_WORK(&info->irq_work, rt8973a_muic_irq_work);576 577 info->regmap = devm_regmap_init_i2c(i2c, &rt8973a_muic_regmap_config);578 if (IS_ERR(info->regmap)) {579 ret = PTR_ERR(info->regmap);580 dev_err(info->dev, "failed to allocate register map: %d\n",581 ret);582 return ret;583 }584 585 /* Support irq domain for RT8973A MUIC device */586 irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;587 ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,588 &rt8973a_muic_irq_chip, &info->irq_data);589 if (ret != 0) {590 dev_err(info->dev, "failed to add irq_chip (irq:%d, err:%d)\n",591 info->irq, ret);592 return ret;593 }594 595 for (i = 0; i < info->num_muic_irqs; i++) {596 struct muic_irq *muic_irq = &info->muic_irqs[i];597 int virq = 0;598 599 virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);600 if (virq <= 0)601 return -EINVAL;602 muic_irq->virq = virq;603 604 ret = devm_request_threaded_irq(info->dev, virq, NULL,605 rt8973a_muic_irq_handler,606 IRQF_NO_SUSPEND | IRQF_ONESHOT,607 muic_irq->name, info);608 if (ret) {609 dev_err(info->dev,610 "failed: irq request (IRQ: %d, error :%d)\n",611 muic_irq->irq, ret);612 return ret;613 }614 }615 616 /* Allocate extcon device */617 info->edev = devm_extcon_dev_allocate(info->dev, rt8973a_extcon_cable);618 if (IS_ERR(info->edev)) {619 dev_err(info->dev, "failed to allocate memory for extcon\n");620 return -ENOMEM;621 }622 623 /* Register extcon device */624 ret = devm_extcon_dev_register(info->dev, info->edev);625 if (ret) {626 dev_err(info->dev, "failed to register extcon device\n");627 return ret;628 }629 630 /*631 * Detect accessory after completing the initialization of platform632 *633 * - Use delayed workqueue to detect cable state and then634 * notify cable state to notifiee/platform through uevent.635 * After completing the booting of platform, the extcon provider636 * driver should notify cable state to upper layer.637 */638 INIT_DELAYED_WORK(&info->wq_detcable, rt8973a_muic_detect_cable_wq);639 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,640 msecs_to_jiffies(DELAY_MS_DEFAULT));641 642 /* Initialize RT8973A device and print vendor id and version id */643 rt8973a_init_dev_type(info);644 645 return 0;646}647 648static void rt8973a_muic_i2c_remove(struct i2c_client *i2c)649{650 struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);651 652 regmap_del_irq_chip(info->irq, info->irq_data);653}654 655static const struct of_device_id rt8973a_dt_match[] = {656 { .compatible = "richtek,rt8973a-muic" },657 { },658};659MODULE_DEVICE_TABLE(of, rt8973a_dt_match);660 661#ifdef CONFIG_PM_SLEEP662static int rt8973a_muic_suspend(struct device *dev)663{664 struct i2c_client *i2c = to_i2c_client(dev);665 struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);666 667 enable_irq_wake(info->irq);668 669 return 0;670}671 672static int rt8973a_muic_resume(struct device *dev)673{674 struct i2c_client *i2c = to_i2c_client(dev);675 struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);676 677 disable_irq_wake(info->irq);678 679 return 0;680}681#endif682 683static SIMPLE_DEV_PM_OPS(rt8973a_muic_pm_ops,684 rt8973a_muic_suspend, rt8973a_muic_resume);685 686static const struct i2c_device_id rt8973a_i2c_id[] = {687 { "rt8973a", TYPE_RT8973A },688 { }689};690MODULE_DEVICE_TABLE(i2c, rt8973a_i2c_id);691 692static struct i2c_driver rt8973a_muic_i2c_driver = {693 .driver = {694 .name = "rt8973a",695 .pm = &rt8973a_muic_pm_ops,696 .of_match_table = rt8973a_dt_match,697 },698 .probe = rt8973a_muic_i2c_probe,699 .remove = rt8973a_muic_i2c_remove,700 .id_table = rt8973a_i2c_id,701};702 703static int __init rt8973a_muic_i2c_init(void)704{705 return i2c_add_driver(&rt8973a_muic_i2c_driver);706}707subsys_initcall(rt8973a_muic_i2c_init);708 709MODULE_DESCRIPTION("Richtek RT8973A Extcon driver");710MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");711MODULE_LICENSE("GPL");712