linux/drivers/extcon/extcon-max8997.c
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   1/*
   2 * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
   3 *
   4 *  Copyright (C) 2012 Samsung Electrnoics
   5 *  Donggeun Kim <dg77.kim@samsung.com>
   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
  33/* MAX8997-MUIC STATUS1 register */
  34#define STATUS1_ADC_SHIFT               0
  35#define STATUS1_ADCLOW_SHIFT            5
  36#define STATUS1_ADCERR_SHIFT            6
  37#define STATUS1_ADC_MASK                (0x1f << STATUS1_ADC_SHIFT)
  38#define STATUS1_ADCLOW_MASK             (0x1 << STATUS1_ADCLOW_SHIFT)
  39#define STATUS1_ADCERR_MASK             (0x1 << STATUS1_ADCERR_SHIFT)
  40
  41/* MAX8997-MUIC STATUS2 register */
  42#define STATUS2_CHGTYP_SHIFT            0
  43#define STATUS2_CHGDETRUN_SHIFT         3
  44#define STATUS2_DCDTMR_SHIFT            4
  45#define STATUS2_DBCHG_SHIFT             5
  46#define STATUS2_VBVOLT_SHIFT            6
  47#define STATUS2_CHGTYP_MASK             (0x7 << STATUS2_CHGTYP_SHIFT)
  48#define STATUS2_CHGDETRUN_MASK          (0x1 << STATUS2_CHGDETRUN_SHIFT)
  49#define STATUS2_DCDTMR_MASK             (0x1 << STATUS2_DCDTMR_SHIFT)
  50#define STATUS2_DBCHG_MASK              (0x1 << STATUS2_DBCHG_SHIFT)
  51#define STATUS2_VBVOLT_MASK             (0x1 << STATUS2_VBVOLT_SHIFT)
  52
  53/* MAX8997-MUIC STATUS3 register */
  54#define STATUS3_OVP_SHIFT               2
  55#define STATUS3_OVP_MASK                (0x1 << STATUS3_OVP_SHIFT)
  56
  57/* MAX8997-MUIC CONTROL1 register */
  58#define COMN1SW_SHIFT                   0
  59#define COMP2SW_SHIFT                   3
  60#define COMN1SW_MASK                    (0x7 << COMN1SW_SHIFT)
  61#define COMP2SW_MASK                    (0x7 << COMP2SW_SHIFT)
  62#define SW_MASK                         (COMP2SW_MASK | COMN1SW_MASK)
  63
  64#define MAX8997_SW_USB          ((1 << COMP2SW_SHIFT) | (1 << COMN1SW_SHIFT))
  65#define MAX8997_SW_AUDIO        ((2 << COMP2SW_SHIFT) | (2 << COMN1SW_SHIFT))
  66#define MAX8997_SW_UART         ((3 << COMP2SW_SHIFT) | (3 << COMN1SW_SHIFT))
  67#define MAX8997_SW_OPEN         ((0 << COMP2SW_SHIFT) | (0 << COMN1SW_SHIFT))
  68
  69#define MAX8997_ADC_GROUND              0x00
  70#define MAX8997_ADC_MHL                 0x01
  71#define MAX8997_ADC_JIG_USB_1           0x18
  72#define MAX8997_ADC_JIG_USB_2           0x19
  73#define MAX8997_ADC_DESKDOCK            0x1a
  74#define MAX8997_ADC_JIG_UART            0x1c
  75#define MAX8997_ADC_CARDOCK             0x1d
  76#define MAX8997_ADC_OPEN                0x1f
  77
  78struct max8997_muic_irq {
  79        unsigned int irq;
  80        const char *name;
  81        unsigned int virq;
  82};
  83
  84static struct max8997_muic_irq muic_irqs[] = {
  85        { MAX8997_MUICIRQ_ADCError, "muic-ADC_error" },
  86        { MAX8997_MUICIRQ_ADCLow, "muic-ADC_low" },
  87        { MAX8997_MUICIRQ_ADC, "muic-ADC" },
  88        { MAX8997_MUICIRQ_VBVolt, "muic-VB_voltage" },
  89        { MAX8997_MUICIRQ_DBChg, "muic-DB_charger" },
  90        { MAX8997_MUICIRQ_DCDTmr, "muic-DCD_timer" },
  91        { MAX8997_MUICIRQ_ChgDetRun, "muic-CDR_status" },
  92        { MAX8997_MUICIRQ_ChgTyp, "muic-charger_type" },
  93        { MAX8997_MUICIRQ_OVP, "muic-over_voltage" },
  94};
  95
  96struct max8997_muic_info {
  97        struct device *dev;
  98        struct i2c_client *muic;
  99        struct max8997_muic_platform_data *muic_pdata;
 100
 101        int irq;
 102        struct work_struct irq_work;
 103
 104        enum max8997_muic_charger_type pre_charger_type;
 105        int pre_adc;
 106
 107        struct mutex mutex;
 108
 109        struct extcon_dev       *edev;
 110};
 111
 112const char *max8997_extcon_cable[] = {
 113        [0] = "USB",
 114        [1] = "USB-Host",
 115        [2] = "TA",
 116        [3] = "Fast-charger",
 117        [4] = "Slow-charger",
 118        [5] = "Charge-downstream",
 119        [6] = "MHL",
 120        [7] = "Dock-desk",
 121        [8] = "Dock-card",
 122        [9] = "JIG",
 123
 124        NULL,
 125};
 126
 127static int max8997_muic_handle_usb(struct max8997_muic_info *info,
 128                        enum max8997_muic_usb_type usb_type, bool attached)
 129{
 130        int ret = 0;
 131
 132        if (usb_type == MAX8997_USB_HOST) {
 133                /* switch to USB */
 134                ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
 135                                attached ? MAX8997_SW_USB : MAX8997_SW_OPEN,
 136                                SW_MASK);
 137                if (ret) {
 138                        dev_err(info->dev, "failed to update muic register\n");
 139                        goto out;
 140                }
 141        }
 142
 143        switch (usb_type) {
 144        case MAX8997_USB_HOST:
 145                extcon_set_cable_state(info->edev, "USB-Host", attached);
 146                break;
 147        case MAX8997_USB_DEVICE:
 148                extcon_set_cable_state(info->edev, "USB", attached);
 149                break;
 150        default:
 151                ret = -EINVAL;
 152                break;
 153        }
 154
 155out:
 156        return ret;
 157}
 158
 159static int max8997_muic_handle_dock(struct max8997_muic_info *info,
 160                        int adc, bool attached)
 161{
 162        int ret = 0;
 163
 164        /* switch to AUDIO */
 165        ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
 166                                attached ? MAX8997_SW_AUDIO : MAX8997_SW_OPEN,
 167                                SW_MASK);
 168        if (ret) {
 169                dev_err(info->dev, "failed to update muic register\n");
 170                goto out;
 171        }
 172
 173        switch (adc) {
 174        case MAX8997_ADC_DESKDOCK:
 175                extcon_set_cable_state(info->edev, "Dock-desk", attached);
 176                break;
 177        case MAX8997_ADC_CARDOCK:
 178                extcon_set_cable_state(info->edev, "Dock-card", attached);
 179                break;
 180        default:
 181                ret = -EINVAL;
 182                break;
 183        }
 184out:
 185        return ret;
 186}
 187
 188static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
 189                        bool attached)
 190{
 191        int ret = 0;
 192
 193        /* switch to UART */
 194        ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
 195                                attached ? MAX8997_SW_UART : MAX8997_SW_OPEN,
 196                                SW_MASK);
 197        if (ret) {
 198                dev_err(info->dev, "failed to update muic register\n");
 199                goto out;
 200        }
 201
 202        extcon_set_cable_state(info->edev, "JIG", attached);
 203out:
 204        return ret;
 205}
 206
 207static int max8997_muic_handle_adc_detach(struct max8997_muic_info *info)
 208{
 209        int ret = 0;
 210
 211        switch (info->pre_adc) {
 212        case MAX8997_ADC_GROUND:
 213                ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, false);
 214                break;
 215        case MAX8997_ADC_MHL:
 216                extcon_set_cable_state(info->edev, "MHL", false);
 217                break;
 218        case MAX8997_ADC_JIG_USB_1:
 219        case MAX8997_ADC_JIG_USB_2:
 220                ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, false);
 221                break;
 222        case MAX8997_ADC_DESKDOCK:
 223        case MAX8997_ADC_CARDOCK:
 224                ret = max8997_muic_handle_dock(info, info->pre_adc, false);
 225                break;
 226        case MAX8997_ADC_JIG_UART:
 227                ret = max8997_muic_handle_jig_uart(info, false);
 228                break;
 229        default:
 230                break;
 231        }
 232
 233        return ret;
 234}
 235
 236static int max8997_muic_handle_adc(struct max8997_muic_info *info, int adc)
 237{
 238        int ret = 0;
 239
 240        switch (adc) {
 241        case MAX8997_ADC_GROUND:
 242                ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, true);
 243                break;
 244        case MAX8997_ADC_MHL:
 245                extcon_set_cable_state(info->edev, "MHL", true);
 246                break;
 247        case MAX8997_ADC_JIG_USB_1:
 248        case MAX8997_ADC_JIG_USB_2:
 249                ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, true);
 250                break;
 251        case MAX8997_ADC_DESKDOCK:
 252        case MAX8997_ADC_CARDOCK:
 253                ret = max8997_muic_handle_dock(info, adc, true);
 254                break;
 255        case MAX8997_ADC_JIG_UART:
 256                ret = max8997_muic_handle_jig_uart(info, true);
 257                break;
 258        case MAX8997_ADC_OPEN:
 259                ret = max8997_muic_handle_adc_detach(info);
 260                break;
 261        default:
 262                ret = -EINVAL;
 263                goto out;
 264        }
 265
 266        info->pre_adc = adc;
 267out:
 268        return ret;
 269}
 270
 271static int max8997_muic_handle_charger_type_detach(
 272                                struct max8997_muic_info *info)
 273{
 274        int ret = 0;
 275
 276        switch (info->pre_charger_type) {
 277        case MAX8997_CHARGER_TYPE_USB:
 278                extcon_set_cable_state(info->edev, "USB", false);
 279                break;
 280        case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
 281                extcon_set_cable_state(info->edev, "Charge-downstream", false);
 282                break;
 283        case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
 284                extcon_set_cable_state(info->edev, "TA", false);
 285                break;
 286        case MAX8997_CHARGER_TYPE_500MA:
 287                extcon_set_cable_state(info->edev, "Slow-charger", false);
 288                break;
 289        case MAX8997_CHARGER_TYPE_1A:
 290                extcon_set_cable_state(info->edev, "Fast-charger", false);
 291                break;
 292        default:
 293                ret = -EINVAL;
 294                break;
 295        }
 296
 297        return ret;
 298}
 299
 300static int max8997_muic_handle_charger_type(struct max8997_muic_info *info,
 301                                enum max8997_muic_charger_type charger_type)
 302{
 303        u8 adc;
 304        int ret;
 305
 306        ret = max8997_read_reg(info->muic, MAX8997_MUIC_REG_STATUS1, &adc);
 307        if (ret) {
 308                dev_err(info->dev, "failed to read muic register\n");
 309                goto out;
 310        }
 311
 312        switch (charger_type) {
 313        case MAX8997_CHARGER_TYPE_NONE:
 314                ret = max8997_muic_handle_charger_type_detach(info);
 315                break;
 316        case MAX8997_CHARGER_TYPE_USB:
 317                if ((adc & STATUS1_ADC_MASK) == MAX8997_ADC_OPEN) {
 318                        max8997_muic_handle_usb(info,
 319                                        MAX8997_USB_DEVICE, true);
 320                }
 321                break;
 322        case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
 323                extcon_set_cable_state(info->edev, "Charge-downstream", true);
 324                break;
 325        case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
 326                extcon_set_cable_state(info->edev, "TA", true);
 327                break;
 328        case MAX8997_CHARGER_TYPE_500MA:
 329                extcon_set_cable_state(info->edev, "Slow-charger", true);
 330                break;
 331        case MAX8997_CHARGER_TYPE_1A:
 332                extcon_set_cable_state(info->edev, "Fast-charger", true);
 333                break;
 334        default:
 335                ret = -EINVAL;
 336                goto out;
 337        }
 338
 339        info->pre_charger_type = charger_type;
 340out:
 341        return ret;
 342}
 343
 344static void max8997_muic_irq_work(struct work_struct *work)
 345{
 346        struct max8997_muic_info *info = container_of(work,
 347                        struct max8997_muic_info, irq_work);
 348        u8 status[2];
 349        u8 adc, chg_type;
 350        int irq_type = 0;
 351        int i, ret;
 352
 353        mutex_lock(&info->mutex);
 354
 355        ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
 356                                2, status);
 357        if (ret) {
 358                dev_err(info->dev, "failed to read muic register\n");
 359                mutex_unlock(&info->mutex);
 360                return;
 361        }
 362
 363        dev_dbg(info->dev, "%s: STATUS1:0x%x, 2:0x%x\n", __func__,
 364                        status[0], status[1]);
 365
 366        for (i = 0 ; i < ARRAY_SIZE(muic_irqs) ; i++)
 367                if (info->irq == muic_irqs[i].virq)
 368                        irq_type = muic_irqs[i].irq;
 369
 370        switch (irq_type) {
 371        case MAX8997_MUICIRQ_ADC:
 372                adc = status[0] & STATUS1_ADC_MASK;
 373                adc >>= STATUS1_ADC_SHIFT;
 374
 375                max8997_muic_handle_adc(info, adc);
 376                break;
 377        case MAX8997_MUICIRQ_ChgTyp:
 378                chg_type = status[1] & STATUS2_CHGTYP_MASK;
 379                chg_type >>= STATUS2_CHGTYP_SHIFT;
 380
 381                max8997_muic_handle_charger_type(info, chg_type);
 382                break;
 383        default:
 384                dev_info(info->dev, "misc interrupt: irq %d occurred\n",
 385                                irq_type);
 386                break;
 387        }
 388
 389        mutex_unlock(&info->mutex);
 390
 391        return;
 392}
 393
 394static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
 395{
 396        struct max8997_muic_info *info = data;
 397
 398        dev_dbg(info->dev, "irq:%d\n", irq);
 399        info->irq = irq;
 400
 401        schedule_work(&info->irq_work);
 402
 403        return IRQ_HANDLED;
 404}
 405
 406static void max8997_muic_detect_dev(struct max8997_muic_info *info)
 407{
 408        int ret;
 409        u8 status[2], adc, chg_type;
 410
 411        ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
 412                                2, status);
 413        if (ret) {
 414                dev_err(info->dev, "failed to read muic register\n");
 415                return;
 416        }
 417
 418        dev_info(info->dev, "STATUS1:0x%x, STATUS2:0x%x\n",
 419                        status[0], status[1]);
 420
 421        adc = status[0] & STATUS1_ADC_MASK;
 422        adc >>= STATUS1_ADC_SHIFT;
 423
 424        chg_type = status[1] & STATUS2_CHGTYP_MASK;
 425        chg_type >>= STATUS2_CHGTYP_SHIFT;
 426
 427        max8997_muic_handle_adc(info, adc);
 428        max8997_muic_handle_charger_type(info, chg_type);
 429}
 430
 431static int __devinit max8997_muic_probe(struct platform_device *pdev)
 432{
 433        struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
 434        struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
 435        struct max8997_muic_info *info;
 436        int ret, i;
 437
 438        info = kzalloc(sizeof(struct max8997_muic_info), GFP_KERNEL);
 439        if (!info) {
 440                dev_err(&pdev->dev, "failed to allocate memory\n");
 441                ret = -ENOMEM;
 442                goto err_kfree;
 443        }
 444
 445        info->dev = &pdev->dev;
 446        info->muic = max8997->muic;
 447
 448        platform_set_drvdata(pdev, info);
 449        mutex_init(&info->mutex);
 450
 451        INIT_WORK(&info->irq_work, max8997_muic_irq_work);
 452
 453        for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
 454                struct max8997_muic_irq *muic_irq = &muic_irqs[i];
 455                int virq = 0;
 456
 457                virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
 458                if (!virq)
 459                        goto err_irq;
 460                muic_irq->virq = virq;
 461
 462                ret = request_threaded_irq(virq, NULL,max8997_muic_irq_handler,
 463                                0, muic_irq->name, info);
 464                if (ret) {
 465                        dev_err(&pdev->dev,
 466                                "failed: irq request (IRQ: %d,"
 467                                " error :%d)\n",
 468                                muic_irq->irq, ret);
 469                        goto err_irq;
 470                }
 471        }
 472
 473        /* External connector */
 474        info->edev = kzalloc(sizeof(struct extcon_dev), GFP_KERNEL);
 475        if (!info->edev) {
 476                dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
 477                ret = -ENOMEM;
 478                goto err_irq;
 479        }
 480        info->edev->name = DEV_NAME;
 481        info->edev->supported_cable = max8997_extcon_cable;
 482        ret = extcon_dev_register(info->edev, NULL);
 483        if (ret) {
 484                dev_err(&pdev->dev, "failed to register extcon device\n");
 485                goto err_extcon;
 486        }
 487
 488        /* Initialize registers according to platform data */
 489        if (pdata->muic_pdata) {
 490                struct max8997_muic_platform_data *mdata = info->muic_pdata;
 491
 492                for (i = 0; i < mdata->num_init_data; i++) {
 493                        max8997_write_reg(info->muic, mdata->init_data[i].addr,
 494                                        mdata->init_data[i].data);
 495                }
 496        }
 497
 498        /* Initial device detection */
 499        max8997_muic_detect_dev(info);
 500
 501        return ret;
 502
 503err_extcon:
 504        kfree(info->edev);
 505err_irq:
 506        while (--i >= 0)
 507                free_irq(muic_irqs[i].virq, info);
 508        kfree(info);
 509err_kfree:
 510        return ret;
 511}
 512
 513static int __devexit max8997_muic_remove(struct platform_device *pdev)
 514{
 515        struct max8997_muic_info *info = platform_get_drvdata(pdev);
 516        int i;
 517
 518        for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
 519                free_irq(muic_irqs[i].virq, info);
 520        cancel_work_sync(&info->irq_work);
 521
 522        extcon_dev_unregister(info->edev);
 523
 524        kfree(info->edev);
 525        kfree(info);
 526
 527        return 0;
 528}
 529
 530static struct platform_driver max8997_muic_driver = {
 531        .driver         = {
 532                .name   = DEV_NAME,
 533                .owner  = THIS_MODULE,
 534        },
 535        .probe          = max8997_muic_probe,
 536        .remove         = __devexit_p(max8997_muic_remove),
 537};
 538
 539module_platform_driver(max8997_muic_driver);
 540
 541MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
 542MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
 543MODULE_LICENSE("GPL");
 544
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