drivers/extcon/extcon-max8997.c

   1 /*
   2  * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
   3  *
   4  *  Copyright (C) 2012 Samsung Electrnoics
   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
  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
  78 struct max8997_muic_irq {
  79         unsigned int irq;
  80         const char *name;
  81         unsigned int virq;
  82 };
  83
  84 static 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
  96 struct 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
 112 const 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
 127 static 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
 155 out:
 156         return ret;
 157 }
 158
 159 static 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         }
 184 out:
 185         return ret;
 186 }
 187
 188 static 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);
 203 out:
 204         return ret;
 205 }
 206
 207 static 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
 236 static 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;
 267 out:
 268         return ret;
 269 }
 270
 271 static 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
 300 static 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;
 340 out:
 341         return ret;
 342 }
 343
 344 static 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
 394 static 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
 406 static 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
 431 static 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
 503 err_extcon:
 504         kfree(info->edev);
 505 err_irq:
 506         while (--i >= 0)
 507                 free_irq(muic_irqs[i].virq, info);
 508         kfree(info);
 509 err_kfree:
 510         return ret;
 511 }
 512
 513 static 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
 530 static 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
 539 module_platform_driver(max8997_muic_driver);
 540
 541 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
 542 MODULE_AUTHOR("Donggeun Kim <[email protected]>");
 543 MODULE_LICENSE("GPL");